drm/mediatek: Add missing IS_ERR check for ovl_adaptor platform devicegrafted

platform_device_register_data() can fail and return an ERR_PTR, but the
return value is used without checking, leading to an invalid pointer
being stored in ddp_comp[].dev and passed to component_match_add() and
mtk_ddp_comp_init(), which could result in a kernel crash.

Add an IS_ERR() check to jump to the error handling path on failure.

Fixes: 0d9eee9118b7 ("drm/mediatek: Add drm ovl_adaptor sub driver for MT8195")
Cc: stable@vger.kernel.org
Signed-off-by: Haojie Li <lihaojie@kylinos.cn>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20260825100845.438893-1-lihaojie@kylinos.cn/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

181 files changed, 5231 insertions, 0 deletions

diff --git a/tools/net/sunrpc/extract.sh b/tools/net/sunrpc/extract.sh
new file mode 100755
index 000000000..f944066f2
--- /dev/null
+++ b/tools/net/sunrpc/extract.sh
@@ -0,0 +1,11 @@
+#! /bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# Extract an RPC protocol specification from an RFC document.
+# The version of this script comes from RFC 8166.
+#
+# Usage:
+#  $ extract.sh < rfcNNNN.txt > protocol.x
+#
+
+grep '^ *///' | sed 's?^ */// ??' | sed 's?^ *///$??'
diff --git a/tools/net/sunrpc/xdrgen/.gitignore b/tools/net/sunrpc/xdrgen/.gitignore
new file mode 100644
index 000000000..d7366c2f9
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/.gitignore
@@ -0,0 +1,2 @@
+__pycache__
+generators/__pycache__
diff --git a/tools/net/sunrpc/xdrgen/README b/tools/net/sunrpc/xdrgen/README
new file mode 100644
index 000000000..2cf05d1e4
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/README
@@ -0,0 +1,259 @@
+xdrgen - Linux Kernel XDR code generator
+
+Introduction
+------------
+
+SunRPC programs are typically specified using a language defined by
+RFC 4506. In fact, all IETF-published NFS specifications provide a
+description of the specified protocol using this language.
+
+Since the 1990's, user space consumers of SunRPC have had access to
+a tool that could read such XDR specifications and then generate C
+code that implements the RPC portions of that protocol. This tool is
+called rpcgen.
+
+This RPC-level code is code that handles input directly from the
+network, and thus a high degree of memory safety and sanity checking
+is needed to help ensure proper levels of security. Bugs in this
+code can have significant impact on security and performance.
+
+However, it is code that is repetitive and tedious to write by hand.
+
+The C code generated by rpcgen makes extensive use of the facilities
+of the user space TI-RPC library and libc. Furthermore, the dialect
+of the generated code is very traditional K&R C.
+
+The Linux kernel's implementation of SunRPC-based protocols hand-roll
+their XDR implementation. There are two main reasons for this:
+
+1. libtirpc (and its predecessors) operate only in user space. The
+   kernel's RPC implementation and its API are significantly
+   different than libtirpc.
+
+2. rpcgen-generated code is believed to be less efficient than code
+   that is hand-written.
+
+These days, gcc and its kin are capable of optimizing code better
+than human authors. There are only a few instances where writing
+XDR code by hand will make a measurable performance different.
+
+In addition, the current hand-written code in the Linux kernel is
+difficult to audit and prove that it implements exactly what is in
+the protocol specification.
+
+In order to accrue the benefits of machine-generated XDR code in the
+kernel, a tool is needed that will output C code that works against
+the kernel's SunRPC implementation rather than libtirpc.
+
+Enter xdrgen.
+
+
+Dependencies
+------------
+
+These dependencies are typically packaged by Linux distributions:
+
+- python3
+- python3-lark
+- python3-jinja2
+
+These dependencies are available via PyPi:
+
+- pip install 'lark[interegular]'
+
+
+XDR Specifications
+------------------
+
+When adding a new protocol implementation to the kernel, the XDR
+specification can be derived by feeding a .txt copy of the RFC to
+the script located in tools/net/sunrpc/extract.sh.
+
+   $ extract.sh < rfc0001.txt > new2.x
+
+
+Operation
+---------
+
+Once a .x file is available, use xdrgen to generate source and
+header files containing an implementation of XDR encoding and
+decoding functions for the specified protocol.
+
+   $ ./xdrgen definitions new2.x > include/linux/sunrpc/xdrgen/new2.h
+   $ ./xdrgen declarations new2.x > new2xdr_gen.h
+
+and
+
+   $ ./xdrgen source new2.x > new2xdr_gen.c
+
+The files are ready to use for a server-side protocol implementation,
+or may be used as a guide for implementing these routines by hand.
+
+By default, the only comments added to this code are kdoc comments
+that appear directly in front of the public per-procedure APIs. For
+deeper introspection, specifying the "--annotate" flag will insert
+additional comments in the generated code to help readers match the
+generated code to specific parts of the XDR specification.
+
+Because the generated code is targeted for the Linux kernel, it
+is tagged with a GPLv2-only license.
+
+The xdrgen tool can also provide lexical and syntax checking of
+an XDR specification:
+
+   $ ./xdrgen lint xdr/new.x
+
+
+How It Works
+------------
+
+xdrgen does not use machine learning to generate source code. The
+translation is entirely deterministic.
+
+RFC 4506 Section 6 contains a BNF grammar of the XDR specification
+language. The grammar has been adapted for use by the Python Lark
+module.
+
+The xdr.ebnf file in this directory contains the grammar used to
+parse XDR specifications. xdrgen configures Lark using the grammar
+in xdr.ebnf. Lark parses the target XDR specification using this
+grammar, creating a parse tree.
+
+xdrgen then transforms the parse tree into an abstract syntax tree.
+This tree is passed to a series of code generators.
+
+The generators are implemented as Python classes residing in the
+generators/ directory. Each generator emits code created from Jinja2
+templates stored in the templates/ directory.
+
+The source code is generated in the same order in which they appear
+in the specification to ensure the generated code compiles. This
+conforms with the behavior of rpcgen.
+
+xdrgen assumes that the generated source code is further compiled by
+a compiler that can optimize in a number of ways, including:
+
+ - Unused functions are discarded (ie, not added to the executable)
+
+ - Aggressive function inlining removes unnecessary stack frames
+
+ - Single-arm switch statements are replaced by a single conditional
+   branch
+
+And so on.
+
+
+Pragmas
+-------
+
+Pragma directives specify exceptions to the normal generation of
+encoding and decoding functions. Currently one directive is
+implemented: "public".
+
+Pragma big_endian
+------ ----------
+
+  pragma big_endian <enum> ;
+
+For variables that might contain only a small number values, it
+is more efficient to avoid the byte-swap when encoding or decoding
+on little-endian machines. Such is often the case with error status
+codes. For example:
+
+  pragma big_endian nfsstat3;
+
+In this case, when generating an XDR struct or union containing a
+field of type "nfsstat3", xdrgen will make the type of that field
+"__be32" instead of "enum nfsstat3". XDR unions then switch on the
+non-byte-swapped value of that field.
+
+Pragma exclude
+------ -------
+
+  pragma exclude <RPC procedure> ;
+
+In some cases, a procedure encoder or decoder function might need
+special processing that cannot be automatically generated. The
+automatically-generated functions might conflict or interfere with
+the hand-rolled function. To avoid editing the generated source code
+by hand, a pragma can specify that the procedure's encoder and
+decoder functions are not included in the generated header and
+source.
+
+For example:
+
+  pragma exclude NFSPROC3_READDIRPLUS;
+
+Excludes the decoder function for the READDIRPLUS argument and the
+encoder function for the READDIRPLUS result.
+
+Note that because data item encoder and decoder functions are
+defined "static __maybe_unused", subsequent compilation
+automatically excludes data item encoder and decoder functions that
+are used only by excluded procedure.
+
+Pragma header
+------ ------
+
+  pragma header <string> ;
+
+Provide a name to use for the header file. For example:
+
+  pragma header nlm4;
+
+Adds
+
+  #include "nlm4xdr_gen.h"
+
+to the generated source file.
+
+Pragma public
+------ ------
+
+  pragma public <XDR data item> ;
+
+Normally XDR encoder and decoder functions are "static". In case an
+implementer wants to call these functions from other source code,
+s/he can add a public pragma in the input .x file to indicate a set
+of functions that should get a prototype in the generated header,
+and the function definitions will not be declared static.
+
+For example:
+
+  pragma public nfsstat3;
+
+Adds these prototypes in the generated header:
+
+  bool xdrgen_decode_nfsstat3(struct xdr_stream *xdr, enum nfsstat3 *ptr);
+  bool xdrgen_encode_nfsstat3(struct xdr_stream *xdr, enum nfsstat3 value);
+
+And, in the generated source code, both of these functions appear
+without the "static __maybe_unused" modifiers.
+
+
+Future Work
+-----------
+
+Finish implementing XDR pointer and list types.
+
+Generate client-side procedure functions
+
+Expand the README into a user guide similar to rpcgen(1)
+
+Add more pragma directives:
+
+  * @pages -- use xdr_read/write_pages() for the specified opaque
+    field
+  * @skip -- do not decode, but rather skip, the specified argument
+    field
+
+Enable something like a #include to dynamically insert the content
+of other specification files
+
+Build a unit test suite for verifying translation of XDR language
+into compilable code
+
+Add a command-line option to insert trace_printk call sites in the
+generated source code, for improved (temporary) observability
+
+Generate kernel Rust code as well as C code
diff --git a/tools/net/sunrpc/xdrgen/__init__.py b/tools/net/sunrpc/xdrgen/__init__.py
new file mode 100644
index 000000000..c940e9275
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/__init__.py
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+# Just to make sphinx-apidoc document this directory
diff --git a/tools/net/sunrpc/xdrgen/generators/__init__.py b/tools/net/sunrpc/xdrgen/generators/__init__.py
new file mode 100644
index 000000000..5c3a4a47d
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/generators/__init__.py
@@ -0,0 +1,121 @@
+# SPDX-License-Identifier: GPL-2.0
+
+"""Define a base code generator class"""
+
+from pathlib import Path
+from jinja2 import Environment, FileSystemLoader, Template
+
+from xdr_ast import _XdrAst, Specification, _RpcProgram, _XdrTypeSpecifier
+from xdr_ast import public_apis, pass_by_reference, structs, get_header_name
+from xdr_parse import get_xdr_annotate
+
+
+def create_jinja2_environment(language: str, xdr_type: str) -> Environment:
+    """Open a set of templates based on output language"""
+    match language:
+        case "C":
+            templates_dir = (
+                Path(__file__).parent.parent / "templates" / language / xdr_type
+            )
+            environment = Environment(
+                loader=FileSystemLoader(templates_dir),
+                trim_blocks=True,
+                lstrip_blocks=True,
+            )
+            environment.globals["annotate"] = get_xdr_annotate()
+            environment.globals["public_apis"] = public_apis
+            environment.globals["pass_by_reference"] = pass_by_reference
+            environment.globals["structs"] = structs
+            return environment
+        case _:
+            raise NotImplementedError("Language not supported")
+
+
+def get_jinja2_template(
+    environment: Environment, template_type: str, template_name: str
+) -> Template:
+    """Retrieve a Jinja2 template for emitting source code"""
+    return environment.get_template(template_type + "/" + template_name + ".j2")
+
+
+def find_xdr_program_name(root: Specification) -> str:
+    """Retrieve the RPC program name from an abstract syntax tree"""
+    raw_name = get_header_name()
+    if raw_name != "none":
+        return raw_name.lower()
+    for definition in root.definitions:
+        if isinstance(definition.value, _RpcProgram):
+            raw_name = definition.value.name
+            return raw_name.lower().removesuffix("_program").removesuffix("_prog")
+    return "noprog"
+
+
+def header_guard_infix(filename: str) -> str:
+    """Extract the header guard infix from the specification filename"""
+    return Path(filename).stem.upper()
+
+
+def kernel_c_type(spec: _XdrTypeSpecifier) -> str:
+    """Return name of C type"""
+    builtin_native_c_type = {
+        "bool": "bool",
+        "short": "s16",
+        "unsigned_short": "u16",
+        "int": "s32",
+        "unsigned_int": "u32",
+        "long": "s32",
+        "unsigned_long": "u32",
+        "hyper": "s64",
+        "unsigned_hyper": "u64",
+    }
+    if spec.type_name in builtin_native_c_type:
+        return builtin_native_c_type[spec.type_name]
+    return spec.type_name
+
+
+class Boilerplate:
+    """Base class to generate boilerplate for source files"""
+
+    def __init__(self, language: str, peer: str):
+        """Initialize an instance of this class"""
+        raise NotImplementedError("No language support defined")
+
+    def emit_declaration(self, filename: str, root: Specification) -> None:
+        """Emit declaration header boilerplate"""
+        raise NotImplementedError("Header boilerplate generation not supported")
+
+    def emit_definition(self, filename: str, root: Specification) -> None:
+        """Emit definition header boilerplate"""
+        raise NotImplementedError("Header boilerplate generation not supported")
+
+    def emit_source(self, filename: str, root: Specification) -> None:
+        """Emit generic source code for this XDR type"""
+        raise NotImplementedError("Source boilerplate generation not supported")
+
+
+class SourceGenerator:
+    """Base class to generate header and source code for XDR types"""
+
+    def __init__(self, language: str, peer: str):
+        """Initialize an instance of this class"""
+        raise NotImplementedError("No language support defined")
+
+    def emit_declaration(self, node: _XdrAst) -> None:
+        """Emit one function declaration for this XDR type"""
+        raise NotImplementedError("Declaration generation not supported")
+
+    def emit_decoder(self, node: _XdrAst) -> None:
+        """Emit one decoder function for this XDR type"""
+        raise NotImplementedError("Decoder generation not supported")
+
+    def emit_definition(self, node: _XdrAst) -> None:
+        """Emit one definition for this XDR type"""
+        raise NotImplementedError("Definition generation not supported")
+
+    def emit_encoder(self, node: _XdrAst) -> None:
+        """Emit one encoder function for this XDR type"""
+        raise NotImplementedError("Encoder generation not supported")
+
+    def emit_maxsize(self, node: _XdrAst) -> None:
+        """Emit one maxsize macro for this XDR type"""
+        raise NotImplementedError("Maxsize macro generation not supported")
diff --git a/tools/net/sunrpc/xdrgen/generators/constant.py b/tools/net/sunrpc/xdrgen/generators/constant.py
new file mode 100644
index 000000000..f2339caf0
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/generators/constant.py
@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Generate code to handle XDR constants"""
+
+from generators import SourceGenerator, create_jinja2_environment
+from xdr_ast import _XdrConstant
+
+class XdrConstantGenerator(SourceGenerator):
+    """Generate source code for XDR constants"""
+
+    def __init__(self, language: str, peer: str):
+        """Initialize an instance of this class"""
+        self.environment = create_jinja2_environment(language, "constants")
+        self.peer = peer
+
+    def emit_definition(self, node: _XdrConstant) -> None:
+        """Emit one definition for a constant"""
+        template = self.environment.get_template("definition.j2")
+        print(template.render(name=node.name, value=node.value))
diff --git a/tools/net/sunrpc/xdrgen/generators/enum.py b/tools/net/sunrpc/xdrgen/generators/enum.py
new file mode 100644
index 000000000..b4ed3ed64
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/generators/enum.py
@@ -0,0 +1,71 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Generate code to handle XDR enum types"""
+
+from generators import SourceGenerator, create_jinja2_environment
+from xdr_ast import _XdrEnum, public_apis, big_endian, get_header_name
+from xdr_parse import get_xdr_enum_validation
+
+
+class XdrEnumGenerator(SourceGenerator):
+    """Generate source code for XDR enum types"""
+
+    def __init__(self, language: str, peer: str):
+        """Initialize an instance of this class"""
+        self.environment = create_jinja2_environment(language, "enum")
+        self.peer = peer
+
+    def emit_declaration(self, node: _XdrEnum) -> None:
+        """Emit one declaration pair for an XDR enum type"""
+        if node.name in public_apis:
+            template = self.environment.get_template("declaration/enum.j2")
+            print(template.render(name=node.name))
+
+    def emit_definition(self, node: _XdrEnum) -> None:
+        """Emit one definition for an XDR enum type"""
+        template = self.environment.get_template("definition/open.j2")
+        print(template.render(name=node.name))
+
+        template = self.environment.get_template("definition/enumerator.j2")
+        for enumerator in node.enumerators:
+            print(template.render(name=enumerator.name, value=enumerator.value))
+
+        if node.name in big_endian:
+            template = self.environment.get_template("definition/close_be.j2")
+        else:
+            template = self.environment.get_template("definition/close.j2")
+        print(template.render(name=node.name))
+
+    def emit_decoder(self, node: _XdrEnum) -> None:
+        """Emit one decoder function for an XDR enum type"""
+        if node.name in big_endian:
+            template = self.environment.get_template("decoder/enum_be.j2")
+        else:
+            template = self.environment.get_template("decoder/enum.j2")
+        print(
+            template.render(
+                name=node.name,
+                enumerators=node.enumerators,
+                validate=get_xdr_enum_validation(),
+            )
+        )
+
+    def emit_encoder(self, node: _XdrEnum) -> None:
+        """Emit one encoder function for an XDR enum type"""
+        if node.name in big_endian:
+            template = self.environment.get_template("encoder/enum_be.j2")
+        else:
+            template = self.environment.get_template("encoder/enum.j2")
+        print(template.render(name=node.name))
+
+    def emit_maxsize(self, node: _XdrEnum) -> None:
+        """Emit one maxsize macro for an XDR enum type"""
+        macro_name = get_header_name().upper() + "_" + node.name + "_sz"
+        template = self.environment.get_template("maxsize/enum.j2")
+        print(
+            template.render(
+                macro=macro_name,
+                width=" + ".join(node.symbolic_width()),
+            )
+        )
diff --git a/tools/net/sunrpc/xdrgen/generators/header_bottom.py b/tools/net/sunrpc/xdrgen/generators/header_bottom.py
new file mode 100644
index 000000000..4b55b282d
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/generators/header_bottom.py
@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Generate header bottom boilerplate"""
+
+import os.path
+import time
+
+from generators import Boilerplate, header_guard_infix
+from generators import create_jinja2_environment, get_jinja2_template
+from xdr_ast import Specification
+
+
+class XdrHeaderBottomGenerator(Boilerplate):
+    """Generate header boilerplate"""
+
+    def __init__(self, language: str, peer: str):
+        """Initialize an instance of this class"""
+        self.environment = create_jinja2_environment(language, "header_bottom")
+        self.peer = peer
+
+    def emit_declaration(self, filename: str, root: Specification) -> None:
+        """Emit the bottom header guard"""
+        template = get_jinja2_template(self.environment, "declaration", "header")
+        print(template.render(infix=header_guard_infix(filename)))
+
+    def emit_definition(self, filename: str, root: Specification) -> None:
+        """Emit the bottom header guard"""
+        template = get_jinja2_template(self.environment, "definition", "header")
+        print(template.render(infix=header_guard_infix(filename)))
+
+    def emit_source(self, filename: str, root: Specification) -> None:
+        pass
diff --git a/tools/net/sunrpc/xdrgen/generators/header_top.py b/tools/net/sunrpc/xdrgen/generators/header_top.py
new file mode 100644
index 000000000..c6bc21c71
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/generators/header_top.py
@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Generate header top boilerplate"""
+
+import os.path
+import time
+
+from generators import Boilerplate, header_guard_infix
+from generators import create_jinja2_environment, get_jinja2_template
+from xdr_ast import Specification
+
+
+class XdrHeaderTopGenerator(Boilerplate):
+    """Generate header boilerplate"""
+
+    def __init__(self, language: str, peer: str):
+        """Initialize an instance of this class"""
+        self.environment = create_jinja2_environment(language, "header_top")
+        self.peer = peer
+
+    def emit_declaration(self, filename: str, root: Specification) -> None:
+        """Emit the top header guard"""
+        template = get_jinja2_template(self.environment, "declaration", "header")
+        print(
+            template.render(
+                infix=header_guard_infix(filename),
+                filename=filename,
+                mtime=time.ctime(os.path.getmtime(filename)),
+            )
+        )
+
+    def emit_definition(self, filename: str, root: Specification) -> None:
+        """Emit the top header guard"""
+        template = get_jinja2_template(self.environment, "definition", "header")
+        print(
+            template.render(
+                infix=header_guard_infix(filename),
+                filename=filename,
+                mtime=time.ctime(os.path.getmtime(filename)),
+            )
+        )
+
+    def emit_source(self, filename: str, root: Specification) -> None:
+        pass
diff --git a/tools/net/sunrpc/xdrgen/generators/passthru.py b/tools/net/sunrpc/xdrgen/generators/passthru.py
new file mode 100644
index 000000000..cb17bd977
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/generators/passthru.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Generate code for XDR pass-through lines"""
+
+from generators import SourceGenerator, create_jinja2_environment
+from xdr_ast import _XdrPassthru
+
+
+class XdrPassthruGenerator(SourceGenerator):
+    """Generate source code for XDR pass-through content"""
+
+    def __init__(self, language: str, peer: str):
+        """Initialize an instance of this class"""
+        self.environment = create_jinja2_environment(language, "passthru")
+        self.peer = peer
+
+    def emit_definition(self, node: _XdrPassthru) -> None:
+        """Emit one pass-through line"""
+        template = self.environment.get_template("definition.j2")
+        print(template.render(content=node.content))
+
+    def emit_decoder(self, node: _XdrPassthru) -> None:
+        """Emit one pass-through line"""
+        template = self.environment.get_template("source.j2")
+        print(template.render(content=node.content))
diff --git a/tools/net/sunrpc/xdrgen/generators/pointer.py b/tools/net/sunrpc/xdrgen/generators/pointer.py
new file mode 100644
index 000000000..6dbda60ad
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/generators/pointer.py
@@ -0,0 +1,288 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Generate code to handle XDR pointer types"""
+
+from jinja2 import Environment
+
+from generators import SourceGenerator, kernel_c_type
+from generators import create_jinja2_environment, get_jinja2_template
+
+from xdr_ast import _XdrBasic, _XdrString
+from xdr_ast import _XdrFixedLengthOpaque, _XdrVariableLengthOpaque
+from xdr_ast import _XdrFixedLengthArray, _XdrVariableLengthArray
+from xdr_ast import _XdrOptionalData, _XdrPointer, _XdrDeclaration
+from xdr_ast import public_apis, get_header_name
+
+
+def emit_pointer_declaration(environment: Environment, node: _XdrPointer) -> None:
+    """Emit a declaration pair for an XDR pointer type"""
+    if node.name in public_apis:
+        template = get_jinja2_template(environment, "declaration", "close")
+        print(template.render(name=node.name))
+
+
+def emit_pointer_member_definition(
+    environment: Environment, field: _XdrDeclaration
+) -> None:
+    """Emit a definition for one field in an XDR struct"""
+    if isinstance(field, _XdrBasic):
+        template = get_jinja2_template(environment, "definition", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=kernel_c_type(field.spec),
+                classifier=field.spec.c_classifier,
+            )
+        )
+    elif isinstance(field, _XdrFixedLengthOpaque):
+        template = get_jinja2_template(environment, "definition", field.template)
+        print(
+            template.render(
+                name=field.name,
+                size=field.size,
+            )
+        )
+    elif isinstance(field, _XdrVariableLengthOpaque):
+        template = get_jinja2_template(environment, "definition", field.template)
+        print(template.render(name=field.name))
+    elif isinstance(field, _XdrString):
+        template = get_jinja2_template(environment, "definition", field.template)
+        print(template.render(name=field.name))
+    elif isinstance(field, _XdrFixedLengthArray):
+        template = get_jinja2_template(environment, "definition", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=kernel_c_type(field.spec),
+                size=field.size,
+            )
+        )
+    elif isinstance(field, _XdrVariableLengthArray):
+        template = get_jinja2_template(environment, "definition", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=kernel_c_type(field.spec),
+                classifier=field.spec.c_classifier,
+            )
+        )
+    elif isinstance(field, _XdrOptionalData):
+        template = get_jinja2_template(environment, "definition", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=kernel_c_type(field.spec),
+                classifier=field.spec.c_classifier,
+            )
+        )
+
+
+def emit_pointer_definition(environment: Environment, node: _XdrPointer) -> None:
+    """Emit a definition for an XDR pointer type"""
+    template = get_jinja2_template(environment, "definition", "open")
+    print(template.render(name=node.name))
+
+    for field in node.fields[0:-1]:
+        emit_pointer_member_definition(environment, field)
+
+    template = get_jinja2_template(environment, "definition", "close")
+    print(template.render(name=node.name))
+
+
+def emit_pointer_member_decoder(
+    environment: Environment, field: _XdrDeclaration
+) -> None:
+    """Emit a decoder for one field in an XDR pointer"""
+    if isinstance(field, _XdrBasic):
+        template = get_jinja2_template(environment, "decoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=field.spec.type_name,
+                classifier=field.spec.c_classifier,
+            )
+        )
+    elif isinstance(field, _XdrFixedLengthOpaque):
+        template = get_jinja2_template(environment, "decoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                size=field.size,
+            )
+        )
+    elif isinstance(field, _XdrVariableLengthOpaque):
+        template = get_jinja2_template(environment, "decoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                maxsize=field.maxsize,
+            )
+        )
+    elif isinstance(field, _XdrString):
+        template = get_jinja2_template(environment, "decoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                maxsize=field.maxsize,
+            )
+        )
+    elif isinstance(field, _XdrFixedLengthArray):
+        template = get_jinja2_template(environment, "decoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=field.spec.type_name,
+                size=field.size,
+                classifier=field.spec.c_classifier,
+            )
+        )
+    elif isinstance(field, _XdrVariableLengthArray):
+        template = get_jinja2_template(environment, "decoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=field.spec.type_name,
+                maxsize=field.maxsize,
+                classifier=field.spec.c_classifier,
+            )
+        )
+    elif isinstance(field, _XdrOptionalData):
+        template = get_jinja2_template(environment, "decoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=field.spec.type_name,
+                classifier=field.spec.c_classifier,
+            )
+        )
+
+
+def emit_pointer_decoder(environment: Environment, node: _XdrPointer) -> None:
+    """Emit one decoder function for an XDR pointer type"""
+    template = get_jinja2_template(environment, "decoder", "open")
+    print(template.render(name=node.name))
+
+    for field in node.fields[0:-1]:
+        emit_pointer_member_decoder(environment, field)
+
+    template = get_jinja2_template(environment, "decoder", "close")
+    print(template.render())
+
+
+def emit_pointer_member_encoder(
+    environment: Environment, field: _XdrDeclaration
+) -> None:
+    """Emit an encoder for one field in a XDR pointer"""
+    if isinstance(field, _XdrBasic):
+        template = get_jinja2_template(environment, "encoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=field.spec.type_name,
+            )
+        )
+    elif isinstance(field, _XdrFixedLengthOpaque):
+        template = get_jinja2_template(environment, "encoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                size=field.size,
+            )
+        )
+    elif isinstance(field, _XdrVariableLengthOpaque):
+        template = get_jinja2_template(environment, "encoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                maxsize=field.maxsize,
+            )
+        )
+    elif isinstance(field, _XdrString):
+        template = get_jinja2_template(environment, "encoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                maxsize=field.maxsize,
+            )
+        )
+    elif isinstance(field, _XdrFixedLengthArray):
+        template = get_jinja2_template(environment, "encoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=field.spec.type_name,
+                size=field.size,
+            )
+        )
+    elif isinstance(field, _XdrVariableLengthArray):
+        template = get_jinja2_template(environment, "encoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=field.spec.type_name,
+                maxsize=field.maxsize,
+            )
+        )
+    elif isinstance(field, _XdrOptionalData):
+        template = get_jinja2_template(environment, "encoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=field.spec.type_name,
+                classifier=field.spec.c_classifier,
+            )
+        )
+
+
+def emit_pointer_encoder(environment: Environment, node: _XdrPointer) -> None:
+    """Emit one encoder function for an XDR pointer type"""
+    template = get_jinja2_template(environment, "encoder", "open")
+    print(template.render(name=node.name))
+
+    for field in node.fields[0:-1]:
+        emit_pointer_member_encoder(environment, field)
+
+    template = get_jinja2_template(environment, "encoder", "close")
+    print(template.render())
+
+
+def emit_pointer_maxsize(environment: Environment, node: _XdrPointer) -> None:
+    """Emit one maxsize macro for an XDR pointer type"""
+    macro_name = get_header_name().upper() + "_" + node.name + "_sz"
+    template = get_jinja2_template(environment, "maxsize", "pointer")
+    print(
+        template.render(
+            macro=macro_name,
+            width=" + ".join(node.symbolic_width()),
+        )
+    )
+
+
+class XdrPointerGenerator(SourceGenerator):
+    """Generate source code for XDR pointer"""
+
+    def __init__(self, language: str, peer: str):
+        """Initialize an instance of this class"""
+        self.environment = create_jinja2_environment(language, "pointer")
+        self.peer = peer
+
+    def emit_declaration(self, node: _XdrPointer) -> None:
+        """Emit one declaration pair for an XDR pointer type"""
+        emit_pointer_declaration(self.environment, node)
+
+    def emit_definition(self, node: _XdrPointer) -> None:
+        """Emit one declaration for an XDR pointer type"""
+        emit_pointer_definition(self.environment, node)
+
+    def emit_decoder(self, node: _XdrPointer) -> None:
+        """Emit one decoder function for an XDR pointer type"""
+        emit_pointer_decoder(self.environment, node)
+
+    def emit_encoder(self, node: _XdrPointer) -> None:
+        """Emit one encoder function for an XDR pointer type"""
+        emit_pointer_encoder(self.environment, node)
+
+    def emit_maxsize(self, node: _XdrPointer) -> None:
+        """Emit one maxsize macro for an XDR pointer type"""
+        emit_pointer_maxsize(self.environment, node)
diff --git a/tools/net/sunrpc/xdrgen/generators/program.py b/tools/net/sunrpc/xdrgen/generators/program.py
new file mode 100644
index 000000000..37f9655c8
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/generators/program.py
@@ -0,0 +1,212 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Generate code for an RPC program's procedures"""
+
+from jinja2 import Environment
+
+from generators import SourceGenerator, create_jinja2_environment, get_jinja2_template
+from xdr_ast import _RpcProgram, _RpcVersion, excluded_apis
+from xdr_ast import max_widths, get_header_name
+
+
+def emit_version_definitions(
+    environment: Environment, program: str, version: _RpcVersion
+) -> None:
+    """Emit procedure numbers for each RPC version's procedures"""
+    template = environment.get_template("definition/open.j2")
+    print(template.render(program=program.upper()))
+
+    template = environment.get_template("definition/procedure.j2")
+    for procedure in version.procedures:
+        if procedure.name not in excluded_apis:
+            print(
+                template.render(
+                    name=procedure.name,
+                    value=procedure.number,
+                )
+            )
+
+    template = environment.get_template("definition/close.j2")
+    print(template.render())
+
+
+def emit_version_declarations(
+    environment: Environment, program: str, version: _RpcVersion
+) -> None:
+    """Emit declarations for each RPC version's procedures"""
+    arguments = dict.fromkeys([])
+    for procedure in version.procedures:
+        if procedure.name not in excluded_apis:
+            if procedure.argument.type_name == "void":
+                continue
+            arguments[procedure.argument.type_name] = None
+    if len(arguments) > 0:
+        print("")
+        template = environment.get_template("declaration/argument.j2")
+        for argument in arguments:
+            print(template.render(program=program, argument=argument))
+
+    results = dict.fromkeys([])
+    for procedure in version.procedures:
+        if procedure.name not in excluded_apis:
+            if procedure.result.type_name == "void":
+                continue
+            results[procedure.result.type_name] = None
+    if len(results) > 0:
+        print("")
+        template = environment.get_template("declaration/result.j2")
+        for result in results:
+            print(template.render(program=program, result=result))
+
+
+def emit_version_argument_decoders(
+    environment: Environment, program: str, version: _RpcVersion
+) -> None:
+    """Emit server argument decoders for each RPC version's procedures"""
+    arguments = dict.fromkeys([])
+    for procedure in version.procedures:
+        if procedure.name not in excluded_apis:
+            if procedure.argument.type_name == "void":
+                continue
+            arguments[procedure.argument.type_name] = None
+
+    template = environment.get_template("decoder/argument.j2")
+    for argument in arguments:
+        print(template.render(program=program, argument=argument))
+
+
+def emit_version_result_decoders(
+    environment: Environment, program: str, version: _RpcVersion
+) -> None:
+    """Emit client result decoders for each RPC version's procedures"""
+    results = dict.fromkeys([])
+    for procedure in version.procedures:
+        if procedure.name not in excluded_apis:
+            results[procedure.result.type_name] = None
+
+    template = environment.get_template("decoder/result.j2")
+    for result in results:
+        print(template.render(program=program, result=result))
+
+
+def emit_version_argument_encoders(
+    environment: Environment, program: str, version: _RpcVersion
+) -> None:
+    """Emit client argument encoders for each RPC version's procedures"""
+    arguments = dict.fromkeys([])
+    for procedure in version.procedures:
+        if procedure.name not in excluded_apis:
+            arguments[procedure.argument.type_name] = None
+
+    template = environment.get_template("encoder/argument.j2")
+    for argument in arguments:
+        print(template.render(program=program, argument=argument))
+
+
+def emit_version_result_encoders(
+    environment: Environment, program: str, version: _RpcVersion
+) -> None:
+    """Emit server result encoders for each RPC version's procedures"""
+    results = dict.fromkeys([])
+    for procedure in version.procedures:
+        if procedure.name not in excluded_apis:
+            if procedure.result.type_name == "void":
+                continue
+            results[procedure.result.type_name] = None
+
+    template = environment.get_template("encoder/result.j2")
+    for result in results:
+        print(template.render(program=program, result=result))
+
+
+class XdrProgramGenerator(SourceGenerator):
+    """Generate source code for an RPC program's procedures"""
+
+    def __init__(self, language: str, peer: str):
+        """Initialize an instance of this class"""
+        self.environment = create_jinja2_environment(language, "program")
+        self.peer = peer
+
+    def emit_definition(self, node: _RpcProgram) -> None:
+        """Emit procedure numbers for each of an RPC programs's procedures"""
+        raw_name = node.name
+        program = raw_name.lower().removesuffix("_program").removesuffix("_prog")
+
+        for version in node.versions:
+            emit_version_definitions(self.environment, program, version)
+
+        template = self.environment.get_template("definition/program.j2")
+        print(template.render(name=raw_name, value=node.number))
+
+    def emit_declaration(self, node: _RpcProgram) -> None:
+        """Emit a declaration pair for each of an RPC programs's procedures"""
+        raw_name = node.name
+        program = raw_name.lower().removesuffix("_program").removesuffix("_prog")
+
+        for version in node.versions:
+            emit_version_declarations(self.environment, program, version)
+
+    def emit_decoder(self, node: _RpcProgram) -> None:
+        """Emit all decoder functions for an RPC program's procedures"""
+        raw_name = node.name
+        program = raw_name.lower().removesuffix("_program").removesuffix("_prog")
+        match self.peer:
+            case "server":
+                for version in node.versions:
+                    emit_version_argument_decoders(
+                        self.environment, program, version,
+                    )
+            case "client":
+                for version in node.versions:
+                    emit_version_result_decoders(
+                        self.environment, program, version,
+                    )
+
+    def emit_encoder(self, node: _RpcProgram) -> None:
+        """Emit all encoder functions for an RPC program's procedures"""
+        raw_name = node.name
+        program = raw_name.lower().removesuffix("_program").removesuffix("_prog")
+        match self.peer:
+            case "server":
+                for version in node.versions:
+                    emit_version_result_encoders(
+                        self.environment, program, version,
+                    )
+            case "client":
+                for version in node.versions:
+                    emit_version_argument_encoders(
+                        self.environment, program, version,
+                    )
+
+    def emit_maxsize(self, node: _RpcProgram) -> None:
+        """Emit maxsize macro for maximum RPC argument size"""
+        header = get_header_name().upper()
+
+        # Find the largest argument across all versions
+        max_arg_width = 0
+        max_arg_name = None
+        for version in node.versions:
+            for procedure in version.procedures:
+                if procedure.name in excluded_apis:
+                    continue
+                arg_name = procedure.argument.type_name
+                if arg_name == "void":
+                    continue
+                if arg_name not in max_widths:
+                    continue
+                if max_widths[arg_name] > max_arg_width:
+                    max_arg_width = max_widths[arg_name]
+                    max_arg_name = arg_name
+
+        if max_arg_name is None:
+            return
+
+        macro_name = header + "_MAX_ARGS_SZ"
+        template = get_jinja2_template(self.environment, "maxsize", "max_args")
+        print(
+            template.render(
+                macro=macro_name,
+                width=header + "_" + max_arg_name + "_sz",
+            )
+        )
diff --git a/tools/net/sunrpc/xdrgen/generators/source_top.py b/tools/net/sunrpc/xdrgen/generators/source_top.py
new file mode 100644
index 000000000..bcf47d93d
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/generators/source_top.py
@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Generate source code boilerplate"""
+
+import os.path
+import time
+
+from generators import Boilerplate
+from generators import find_xdr_program_name, create_jinja2_environment
+from xdr_ast import _RpcProgram, Specification, get_header_name
+
+
+class XdrSourceTopGenerator(Boilerplate):
+    """Generate source code boilerplate"""
+
+    def __init__(self, language: str, peer: str):
+        """Initialize an instance of this class"""
+        self.environment = create_jinja2_environment(language, "source_top")
+        self.peer = peer
+
+    def emit_source(self, filename: str, root: Specification) -> None:
+        """Emit the top source boilerplate"""
+        name = find_xdr_program_name(root)
+        template = self.environment.get_template(self.peer + ".j2")
+        print(
+            template.render(
+                program=name,
+                filename=filename,
+                mtime=time.ctime(os.path.getmtime(filename)),
+            )
+        )
diff --git a/tools/net/sunrpc/xdrgen/generators/struct.py b/tools/net/sunrpc/xdrgen/generators/struct.py
new file mode 100644
index 000000000..64911de46
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/generators/struct.py
@@ -0,0 +1,288 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Generate code to handle XDR struct types"""
+
+from jinja2 import Environment
+
+from generators import SourceGenerator, kernel_c_type
+from generators import create_jinja2_environment, get_jinja2_template
+
+from xdr_ast import _XdrBasic, _XdrString
+from xdr_ast import _XdrFixedLengthOpaque, _XdrVariableLengthOpaque
+from xdr_ast import _XdrFixedLengthArray, _XdrVariableLengthArray
+from xdr_ast import _XdrOptionalData, _XdrStruct, _XdrDeclaration
+from xdr_ast import public_apis, get_header_name
+
+
+def emit_struct_declaration(environment: Environment, node: _XdrStruct) -> None:
+    """Emit one declaration pair for an XDR struct type"""
+    if node.name in public_apis:
+        template = get_jinja2_template(environment, "declaration", "close")
+        print(template.render(name=node.name))
+
+
+def emit_struct_member_definition(
+    environment: Environment, field: _XdrDeclaration
+) -> None:
+    """Emit a definition for one field in an XDR struct"""
+    if isinstance(field, _XdrBasic):
+        template = get_jinja2_template(environment, "definition", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=kernel_c_type(field.spec),
+                classifier=field.spec.c_classifier,
+            )
+        )
+    elif isinstance(field, _XdrFixedLengthOpaque):
+        template = get_jinja2_template(environment, "definition", field.template)
+        print(
+            template.render(
+                name=field.name,
+                size=field.size,
+            )
+        )
+    elif isinstance(field, _XdrVariableLengthOpaque):
+        template = get_jinja2_template(environment, "definition", field.template)
+        print(template.render(name=field.name))
+    elif isinstance(field, _XdrString):
+        template = get_jinja2_template(environment, "definition", field.template)
+        print(template.render(name=field.name))
+    elif isinstance(field, _XdrFixedLengthArray):
+        template = get_jinja2_template(environment, "definition", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=kernel_c_type(field.spec),
+                size=field.size,
+            )
+        )
+    elif isinstance(field, _XdrVariableLengthArray):
+        template = get_jinja2_template(environment, "definition", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=kernel_c_type(field.spec),
+                classifier=field.spec.c_classifier,
+            )
+        )
+    elif isinstance(field, _XdrOptionalData):
+        template = get_jinja2_template(environment, "definition", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=kernel_c_type(field.spec),
+                classifier=field.spec.c_classifier,
+            )
+        )
+
+
+def emit_struct_definition(environment: Environment, node: _XdrStruct) -> None:
+    """Emit one definition for an XDR struct type"""
+    template = get_jinja2_template(environment, "definition", "open")
+    print(template.render(name=node.name))
+
+    for field in node.fields:
+        emit_struct_member_definition(environment, field)
+
+    template = get_jinja2_template(environment, "definition", "close")
+    print(template.render(name=node.name))
+
+
+def emit_struct_member_decoder(
+    environment: Environment, field: _XdrDeclaration
+) -> None:
+    """Emit a decoder for one field in an XDR struct"""
+    if isinstance(field, _XdrBasic):
+        template = get_jinja2_template(environment, "decoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=field.spec.type_name,
+                classifier=field.spec.c_classifier,
+            )
+        )
+    elif isinstance(field, _XdrFixedLengthOpaque):
+        template = get_jinja2_template(environment, "decoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                size=field.size,
+            )
+        )
+    elif isinstance(field, _XdrVariableLengthOpaque):
+        template = get_jinja2_template(environment, "decoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                maxsize=field.maxsize,
+            )
+        )
+    elif isinstance(field, _XdrString):
+        template = get_jinja2_template(environment, "decoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                maxsize=field.maxsize,
+            )
+        )
+    elif isinstance(field, _XdrFixedLengthArray):
+        template = get_jinja2_template(environment, "decoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=field.spec.type_name,
+                size=field.size,
+                classifier=field.spec.c_classifier,
+            )
+        )
+    elif isinstance(field, _XdrVariableLengthArray):
+        template = get_jinja2_template(environment, "decoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=field.spec.type_name,
+                maxsize=field.maxsize,
+                classifier=field.spec.c_classifier,
+            )
+        )
+    elif isinstance(field, _XdrOptionalData):
+        template = get_jinja2_template(environment, "decoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=field.spec.type_name,
+                classifier=field.spec.c_classifier,
+            )
+        )
+
+
+def emit_struct_decoder(environment: Environment, node: _XdrStruct) -> None:
+    """Emit one decoder function for an XDR struct type"""
+    template = get_jinja2_template(environment, "decoder", "open")
+    print(template.render(name=node.name))
+
+    for field in node.fields:
+        emit_struct_member_decoder(environment, field)
+
+    template = get_jinja2_template(environment, "decoder", "close")
+    print(template.render())
+
+
+def emit_struct_member_encoder(
+    environment: Environment, field: _XdrDeclaration
+) -> None:
+    """Emit an encoder for one field in an XDR struct"""
+    if isinstance(field, _XdrBasic):
+        template = get_jinja2_template(environment, "encoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=field.spec.type_name,
+            )
+        )
+    elif isinstance(field, _XdrFixedLengthOpaque):
+        template = get_jinja2_template(environment, "encoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                size=field.size,
+            )
+        )
+    elif isinstance(field, _XdrVariableLengthOpaque):
+        template = get_jinja2_template(environment, "encoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                maxsize=field.maxsize,
+            )
+        )
+    elif isinstance(field, _XdrString):
+        template = get_jinja2_template(environment, "encoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                maxsize=field.maxsize,
+            )
+        )
+    elif isinstance(field, _XdrFixedLengthArray):
+        template = get_jinja2_template(environment, "encoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=field.spec.type_name,
+                size=field.size,
+            )
+        )
+    elif isinstance(field, _XdrVariableLengthArray):
+        template = get_jinja2_template(environment, "encoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=field.spec.type_name,
+                maxsize=field.maxsize,
+            )
+        )
+    elif isinstance(field, _XdrOptionalData):
+        template = get_jinja2_template(environment, "encoder", field.template)
+        print(
+            template.render(
+                name=field.name,
+                type=field.spec.type_name,
+                classifier=field.spec.c_classifier,
+            )
+        )
+
+
+def emit_struct_encoder(environment: Environment, node: _XdrStruct) -> None:
+    """Emit one encoder function for an XDR struct type"""
+    template = get_jinja2_template(environment, "encoder", "open")
+    print(template.render(name=node.name))
+
+    for field in node.fields:
+        emit_struct_member_encoder(environment, field)
+
+    template = get_jinja2_template(environment, "encoder", "close")
+    print(template.render())
+
+
+def emit_struct_maxsize(environment: Environment, node: _XdrStruct) -> None:
+    """Emit one maxsize macro for an XDR struct type"""
+    macro_name = get_header_name().upper() + "_" + node.name + "_sz"
+    template = get_jinja2_template(environment, "maxsize", "struct")
+    print(
+        template.render(
+            macro=macro_name,
+            width=" + ".join(node.symbolic_width()),
+        )
+    )
+
+
+class XdrStructGenerator(SourceGenerator):
+    """Generate source code for XDR structs"""
+
+    def __init__(self, language: str, peer: str):
+        """Initialize an instance of this class"""
+        self.environment = create_jinja2_environment(language, "struct")
+        self.peer = peer
+
+    def emit_declaration(self, node: _XdrStruct) -> None:
+        """Emit one declaration pair for an XDR struct type"""
+        emit_struct_declaration(self.environment, node)
+
+    def emit_definition(self, node: _XdrStruct) -> None:
+        """Emit one definition for an XDR struct type"""
+        emit_struct_definition(self.environment, node)
+
+    def emit_decoder(self, node: _XdrStruct) -> None:
+        """Emit one decoder function for an XDR struct type"""
+        emit_struct_decoder(self.environment, node)
+
+    def emit_encoder(self, node: _XdrStruct) -> None:
+        """Emit one encoder function for an XDR struct type"""
+        emit_struct_encoder(self.environment, node)
+
+    def emit_maxsize(self, node: _XdrStruct) -> None:
+        """Emit one maxsize macro for an XDR struct type"""
+        emit_struct_maxsize(self.environment, node)
diff --git a/tools/net/sunrpc/xdrgen/generators/typedef.py b/tools/net/sunrpc/xdrgen/generators/typedef.py
new file mode 100644
index 000000000..75e3a40e1
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/generators/typedef.py
@@ -0,0 +1,271 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Generate code to handle XDR typedefs"""
+
+from jinja2 import Environment
+
+from generators import SourceGenerator, kernel_c_type
+from generators import create_jinja2_environment, get_jinja2_template
+
+from xdr_ast import _XdrBasic, _XdrTypedef, _XdrString
+from xdr_ast import _XdrFixedLengthOpaque, _XdrVariableLengthOpaque
+from xdr_ast import _XdrFixedLengthArray, _XdrVariableLengthArray
+from xdr_ast import _XdrOptionalData, _XdrVoid, _XdrDeclaration
+from xdr_ast import public_apis, get_header_name
+
+
+def emit_typedef_declaration(environment: Environment, node: _XdrDeclaration) -> None:
+    """Emit a declaration pair for one XDR typedef"""
+    if node.name not in public_apis:
+        return
+    if isinstance(node, _XdrBasic):
+        template = get_jinja2_template(environment, "declaration", node.template)
+        print(
+            template.render(
+                name=node.name,
+                type=kernel_c_type(node.spec),
+                classifier=node.spec.c_classifier,
+            )
+        )
+    elif isinstance(node, _XdrString):
+        template = get_jinja2_template(environment, "declaration", node.template)
+        print(template.render(name=node.name))
+    elif isinstance(node, _XdrFixedLengthOpaque):
+        template = get_jinja2_template(environment, "declaration", node.template)
+        print(template.render(name=node.name, size=node.size))
+    elif isinstance(node, _XdrVariableLengthOpaque):
+        template = get_jinja2_template(environment, "declaration", node.template)
+        print(template.render(name=node.name))
+    elif isinstance(node, _XdrFixedLengthArray):
+        template = get_jinja2_template(environment, "declaration", node.template)
+        print(
+            template.render(
+                name=node.name,
+                type=node.spec.type_name,
+                size=node.size,
+            )
+        )
+    elif isinstance(node, _XdrVariableLengthArray):
+        template = get_jinja2_template(environment, "declaration", node.template)
+        print(
+            template.render(
+                name=node.name,
+                type=node.spec.type_name,
+                classifier=node.spec.c_classifier,
+            )
+        )
+    elif isinstance(node, _XdrOptionalData):
+        raise NotImplementedError("<optional_data> typedef not yet implemented")
+    elif isinstance(node, _XdrVoid):
+        raise ValueError("invalid void usage in RPC Specification")
+    else:
+        raise NotImplementedError("typedef: type not recognized")
+
+
+def emit_type_definition(environment: Environment, node: _XdrDeclaration) -> None:
+    """Emit a definition for one XDR typedef"""
+    if isinstance(node, _XdrBasic):
+        template = get_jinja2_template(environment, "definition", node.template)
+        print(
+            template.render(
+                name=node.name,
+                type=kernel_c_type(node.spec),
+                classifier=node.spec.c_classifier,
+            )
+        )
+    elif isinstance(node, _XdrString):
+        template = get_jinja2_template(environment, "definition", node.template)
+        print(template.render(name=node.name))
+    elif isinstance(node, _XdrFixedLengthOpaque):
+        template = get_jinja2_template(environment, "definition", node.template)
+        print(template.render(name=node.name, size=node.size))
+    elif isinstance(node, _XdrVariableLengthOpaque):
+        template = get_jinja2_template(environment, "definition", node.template)
+        print(template.render(name=node.name))
+    elif isinstance(node, _XdrFixedLengthArray):
+        template = get_jinja2_template(environment, "definition", node.template)
+        print(
+            template.render(
+                name=node.name,
+                type=node.spec.type_name,
+                size=node.size,
+            )
+        )
+    elif isinstance(node, _XdrVariableLengthArray):
+        template = get_jinja2_template(environment, "definition", node.template)
+        print(
+            template.render(
+                name=node.name,
+                type=node.spec.type_name,
+                classifier=node.spec.c_classifier,
+            )
+        )
+    elif isinstance(node, _XdrOptionalData):
+        raise NotImplementedError("<optional_data> typedef not yet implemented")
+    elif isinstance(node, _XdrVoid):
+        raise ValueError("invalid void usage in RPC Specification")
+    else:
+        raise NotImplementedError("typedef: type not recognized")
+
+
+def emit_typedef_decoder(environment: Environment, node: _XdrDeclaration) -> None:
+    """Emit a decoder function for one XDR typedef"""
+    if isinstance(node, _XdrBasic):
+        template = get_jinja2_template(environment, "decoder", node.template)
+        print(
+            template.render(
+                name=node.name,
+                type=node.spec.type_name,
+            )
+        )
+    elif isinstance(node, _XdrString):
+        template = get_jinja2_template(environment, "decoder", node.template)
+        print(
+            template.render(
+                name=node.name,
+                maxsize=node.maxsize,
+            )
+        )
+    elif isinstance(node, _XdrFixedLengthOpaque):
+        template = get_jinja2_template(environment, "decoder", node.template)
+        print(
+            template.render(
+                name=node.name,
+                size=node.size,
+            )
+        )
+    elif isinstance(node, _XdrVariableLengthOpaque):
+        template = get_jinja2_template(environment, "decoder", node.template)
+        print(
+            template.render(
+                name=node.name,
+                maxsize=node.maxsize,
+            )
+        )
+    elif isinstance(node, _XdrFixedLengthArray):
+        template = get_jinja2_template(environment, "decoder", node.template)
+        print(
+            template.render(
+                name=node.name,
+                type=node.spec.type_name,
+                size=node.size,
+                classifier=node.spec.c_classifier,
+            )
+        )
+    elif isinstance(node, _XdrVariableLengthArray):
+        template = get_jinja2_template(environment, "decoder", node.template)
+        print(
+            template.render(
+                name=node.name,
+                type=node.spec.type_name,
+                maxsize=node.maxsize,
+            )
+        )
+    elif isinstance(node, _XdrOptionalData):
+        raise NotImplementedError("<optional_data> typedef not yet implemented")
+    elif isinstance(node, _XdrVoid):
+        raise ValueError("invalid void usage in RPC Specification")
+    else:
+        raise NotImplementedError("typedef: type not recognized")
+
+
+def emit_typedef_encoder(environment: Environment, node: _XdrDeclaration) -> None:
+    """Emit an encoder function for one XDR typedef"""
+    if isinstance(node, _XdrBasic):
+        template = get_jinja2_template(environment, "encoder", node.template)
+        print(
+            template.render(
+                name=node.name,
+                type=node.spec.type_name,
+            )
+        )
+    elif isinstance(node, _XdrString):
+        template = get_jinja2_template(environment, "encoder", node.template)
+        print(
+            template.render(
+                name=node.name,
+                maxsize=node.maxsize,
+            )
+        )
+    elif isinstance(node, _XdrFixedLengthOpaque):
+        template = get_jinja2_template(environment, "encoder", node.template)
+        print(
+            template.render(
+                name=node.name,
+                size=node.size,
+            )
+        )
+    elif isinstance(node, _XdrVariableLengthOpaque):
+        template = get_jinja2_template(environment, "encoder", node.template)
+        print(
+            template.render(
+                name=node.name,
+                maxsize=node.maxsize,
+            )
+        )
+    elif isinstance(node, _XdrFixedLengthArray):
+        template = get_jinja2_template(environment, "encoder", node.template)
+        print(
+            template.render(
+                name=node.name,
+                type=node.spec.type_name,
+                size=node.size,
+            )
+        )
+    elif isinstance(node, _XdrVariableLengthArray):
+        template = get_jinja2_template(environment, "encoder", node.template)
+        print(
+            template.render(
+                name=node.name,
+                type=node.spec.type_name,
+                maxsize=node.maxsize,
+            )
+        )
+    elif isinstance(node, _XdrOptionalData):
+        raise NotImplementedError("<optional_data> typedef not yet implemented")
+    elif isinstance(node, _XdrVoid):
+        raise ValueError("invalid void usage in RPC Specification")
+    else:
+        raise NotImplementedError("typedef: type not recognized")
+
+
+def emit_typedef_maxsize(environment: Environment, node: _XdrDeclaration) -> None:
+    """Emit a maxsize macro for an XDR typedef"""
+    macro_name = get_header_name().upper() + "_" + node.name + "_sz"
+    template = get_jinja2_template(environment, "maxsize", node.template)
+    print(
+        template.render(
+            macro=macro_name,
+            width=" + ".join(node.symbolic_width()),
+        )
+    )
+
+
+class XdrTypedefGenerator(SourceGenerator):
+    """Generate source code for XDR typedefs"""
+
+    def __init__(self, language: str, peer: str):
+        """Initialize an instance of this class"""
+        self.environment = create_jinja2_environment(language, "typedef")
+        self.peer = peer
+
+    def emit_declaration(self, node: _XdrTypedef) -> None:
+        """Emit one declaration pair for an XDR enum type"""
+        emit_typedef_declaration(self.environment, node.declaration)
+
+    def emit_definition(self, node: _XdrTypedef) -> None:
+        """Emit one definition for an XDR typedef"""
+        emit_type_definition(self.environment, node.declaration)
+
+    def emit_decoder(self, node: _XdrTypedef) -> None:
+        """Emit one decoder function for an XDR typedef"""
+        emit_typedef_decoder(self.environment, node.declaration)
+
+    def emit_encoder(self, node: _XdrTypedef) -> None:
+        """Emit one encoder function for an XDR typedef"""
+        emit_typedef_encoder(self.environment, node.declaration)
+
+    def emit_maxsize(self, node: _XdrTypedef) -> None:
+        """Emit one maxsize macro for an XDR typedef"""
+        emit_typedef_maxsize(self.environment, node.declaration)
diff --git a/tools/net/sunrpc/xdrgen/generators/union.py b/tools/net/sunrpc/xdrgen/generators/union.py
new file mode 100644
index 000000000..d15837dae
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/generators/union.py
@@ -0,0 +1,366 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Generate code to handle XDR unions"""
+
+from jinja2 import Environment
+
+from generators import SourceGenerator
+from generators import create_jinja2_environment, get_jinja2_template
+
+from xdr_ast import _XdrBasic, _XdrUnion, _XdrVoid, _XdrString, get_header_name
+from xdr_ast import _XdrDeclaration, _XdrCaseSpec, public_apis, big_endian
+
+
+def emit_union_declaration(environment: Environment, node: _XdrUnion) -> None:
+    """Emit one declaration pair for an XDR union type"""
+    if node.name in public_apis:
+        template = get_jinja2_template(environment, "declaration", "close")
+        print(template.render(name=node.name))
+
+
+def emit_union_switch_spec_definition(
+    environment: Environment, node: _XdrDeclaration
+) -> None:
+    """Emit a definition for an XDR union's discriminant"""
+    assert isinstance(node, _XdrBasic)
+    template = get_jinja2_template(environment, "definition", "switch_spec")
+    print(
+        template.render(
+            name=node.name,
+            type=node.spec.type_name,
+            classifier=node.spec.c_classifier,
+        )
+    )
+
+
+def emit_union_case_spec_definition(
+    environment: Environment, node: _XdrDeclaration
+) -> None:
+    """Emit a definition for an XDR union's case arm"""
+    if isinstance(node.arm, _XdrVoid):
+        return
+    if isinstance(node.arm, _XdrString):
+        type_name = "char *"
+        classifier = ""
+    else:
+        type_name = node.arm.spec.type_name
+        classifier = node.arm.spec.c_classifier
+
+    assert isinstance(node.arm, (_XdrBasic, _XdrString))
+    template = get_jinja2_template(environment, "definition", "case_spec")
+    print(
+        template.render(
+            name=node.arm.name,
+            type=type_name,
+            classifier=classifier,
+        )
+    )
+
+
+def emit_union_definition(environment: Environment, node: _XdrUnion) -> None:
+    """Emit one XDR union definition"""
+    template = get_jinja2_template(environment, "definition", "open")
+    print(template.render(name=node.name))
+
+    emit_union_switch_spec_definition(environment, node.discriminant)
+
+    for case in node.cases:
+        emit_union_case_spec_definition(environment, case)
+
+    if node.default is not None:
+        emit_union_case_spec_definition(environment, node.default)
+
+    template = get_jinja2_template(environment, "definition", "close")
+    print(template.render(name=node.name))
+
+
+def emit_union_switch_spec_decoder(
+    environment: Environment, node: _XdrDeclaration
+) -> None:
+    """Emit a decoder for an XDR union's discriminant"""
+    assert isinstance(node, _XdrBasic)
+    template = get_jinja2_template(environment, "decoder", "switch_spec")
+    print(template.render(name=node.name, type=node.spec.type_name))
+
+
+def emit_union_arm_decoder(
+    environment: Environment, node: _XdrCaseSpec
+) -> None:
+    """Emit decoder for an XDR union's arm (data only, no case/break)"""
+
+    if isinstance(node.arm, _XdrVoid):
+        return
+    if isinstance(node.arm, _XdrString):
+        type_name = "char *"
+        classifier = ""
+    else:
+        type_name = node.arm.spec.type_name
+        classifier = node.arm.spec.c_classifier
+
+    assert isinstance(node.arm, (_XdrBasic, _XdrString))
+    template = get_jinja2_template(environment, "decoder", node.arm.template)
+    print(
+        template.render(
+            name=node.arm.name,
+            type=type_name,
+            classifier=classifier,
+        )
+    )
+
+
+def emit_union_case_spec_decoder(
+    environment: Environment, node: _XdrCaseSpec, big_endian_discriminant: bool
+) -> None:
+    """Emit decoder functions for an XDR union's case arm"""
+
+    if isinstance(node.arm, _XdrVoid):
+        return
+    if isinstance(node.arm, _XdrString):
+        type_name = "char *"
+        classifier = ""
+    else:
+        type_name = node.arm.spec.type_name
+        classifier = node.arm.spec.c_classifier
+
+    if big_endian_discriminant:
+        template = get_jinja2_template(environment, "decoder", "case_spec_be")
+    else:
+        template = get_jinja2_template(environment, "decoder", "case_spec")
+    for case in node.values:
+        print(template.render(case=case))
+
+    assert isinstance(node.arm, (_XdrBasic, _XdrString))
+    template = get_jinja2_template(environment, "decoder", node.arm.template)
+    print(
+        template.render(
+            name=node.arm.name,
+            type=type_name,
+            classifier=classifier,
+        )
+    )
+
+    template = get_jinja2_template(environment, "decoder", "break")
+    print(template.render())
+
+
+def emit_union_default_spec_decoder(environment: Environment, node: _XdrUnion) -> None:
+    """Emit a decoder function for an XDR union's default arm"""
+    default_case = node.default
+
+    # Avoid a gcc warning about a default case with boolean discriminant
+    if default_case is None and node.discriminant.spec.type_name == "bool":
+        return
+
+    template = get_jinja2_template(environment, "decoder", "default_spec")
+    print(template.render())
+
+    if default_case is None or isinstance(default_case.arm, _XdrVoid):
+        template = get_jinja2_template(environment, "decoder", "break")
+        print(template.render())
+        return
+
+    assert isinstance(default_case.arm, _XdrBasic)
+    template = get_jinja2_template(environment, "decoder", default_case.arm.template)
+    print(
+        template.render(
+            name=default_case.arm.name,
+            type=default_case.arm.spec.type_name,
+            classifier=default_case.arm.spec.c_classifier,
+        )
+    )
+
+
+def emit_union_decoder(environment: Environment, node: _XdrUnion) -> None:
+    """Emit one XDR union decoder"""
+    template = get_jinja2_template(environment, "decoder", "open")
+    print(template.render(name=node.name))
+
+    # For boolean discriminants, use if statement instead of switch
+    if node.discriminant.spec.type_name == "bool":
+        template = get_jinja2_template(environment, "decoder", "bool_spec")
+        print(template.render(name=node.discriminant.name, type=node.discriminant.spec.type_name))
+
+        # Find and emit the TRUE case
+        for case in node.cases:
+            if case.values and case.values[0] == "TRUE":
+                emit_union_arm_decoder(environment, case)
+                break
+
+        template = get_jinja2_template(environment, "decoder", "close")
+        print(template.render())
+    else:
+        emit_union_switch_spec_decoder(environment, node.discriminant)
+
+        for case in node.cases:
+            emit_union_case_spec_decoder(
+                environment,
+                case,
+                node.discriminant.spec.type_name in big_endian,
+            )
+
+        emit_union_default_spec_decoder(environment, node)
+
+        template = get_jinja2_template(environment, "decoder", "close")
+        print(template.render())
+
+
+def emit_union_switch_spec_encoder(
+    environment: Environment, node: _XdrDeclaration
+) -> None:
+    """Emit an encoder for an XDR union's discriminant"""
+    assert isinstance(node, _XdrBasic)
+    template = get_jinja2_template(environment, "encoder", "switch_spec")
+    print(template.render(name=node.name, type=node.spec.type_name))
+
+
+def emit_union_arm_encoder(
+    environment: Environment, node: _XdrCaseSpec
+) -> None:
+    """Emit encoder for an XDR union's arm (data only, no case/break)"""
+
+    if isinstance(node.arm, _XdrVoid):
+        return
+    if isinstance(node.arm, _XdrString):
+        type_name = "char *"
+    else:
+        type_name = node.arm.spec.type_name
+
+    assert isinstance(node.arm, (_XdrBasic, _XdrString))
+    template = get_jinja2_template(environment, "encoder", node.arm.template)
+    print(
+        template.render(
+            name=node.arm.name,
+            type=type_name,
+        )
+    )
+
+
+def emit_union_case_spec_encoder(
+    environment: Environment, node: _XdrCaseSpec, big_endian_discriminant: bool
+) -> None:
+    """Emit encoder functions for an XDR union's case arm"""
+
+    if isinstance(node.arm, _XdrVoid):
+        return
+    if isinstance(node.arm, _XdrString):
+        type_name = "char *"
+    else:
+        type_name = node.arm.spec.type_name
+    if big_endian_discriminant:
+        template = get_jinja2_template(environment, "encoder", "case_spec_be")
+    else:
+        template = get_jinja2_template(environment, "encoder", "case_spec")
+    for case in node.values:
+        print(template.render(case=case))
+
+    template = get_jinja2_template(environment, "encoder", node.arm.template)
+    print(
+        template.render(
+            name=node.arm.name,
+            type=type_name,
+        )
+    )
+
+    template = get_jinja2_template(environment, "encoder", "break")
+    print(template.render())
+
+
+def emit_union_default_spec_encoder(environment: Environment, node: _XdrUnion) -> None:
+    """Emit an encoder function for an XDR union's default arm"""
+    default_case = node.default
+
+    # Avoid a gcc warning about a default case with boolean discriminant
+    if default_case is None and node.discriminant.spec.type_name == "bool":
+        return
+
+    template = get_jinja2_template(environment, "encoder", "default_spec")
+    print(template.render())
+
+    if default_case is None or isinstance(default_case.arm, _XdrVoid):
+        template = get_jinja2_template(environment, "encoder", "break")
+        print(template.render())
+        return
+
+    template = get_jinja2_template(environment, "encoder", default_case.arm.template)
+    print(
+        template.render(
+            name=default_case.arm.name,
+            type=default_case.arm.spec.type_name,
+        )
+    )
+
+
+def emit_union_encoder(environment, node: _XdrUnion) -> None:
+    """Emit one XDR union encoder"""
+    template = get_jinja2_template(environment, "encoder", "open")
+    print(template.render(name=node.name))
+
+    # For boolean discriminants, use if statement instead of switch
+    if node.discriminant.spec.type_name == "bool":
+        template = get_jinja2_template(environment, "encoder", "bool_spec")
+        print(template.render(name=node.discriminant.name, type=node.discriminant.spec.type_name))
+
+        # Find and emit the TRUE case
+        for case in node.cases:
+            if case.values and case.values[0] == "TRUE":
+                emit_union_arm_encoder(environment, case)
+                break
+
+        template = get_jinja2_template(environment, "encoder", "close")
+        print(template.render())
+    else:
+        emit_union_switch_spec_encoder(environment, node.discriminant)
+
+        for case in node.cases:
+            emit_union_case_spec_encoder(
+                environment,
+                case,
+                node.discriminant.spec.type_name in big_endian,
+            )
+
+        emit_union_default_spec_encoder(environment, node)
+
+        template = get_jinja2_template(environment, "encoder", "close")
+        print(template.render())
+
+
+def emit_union_maxsize(environment: Environment, node: _XdrUnion) -> None:
+    """Emit one maxsize macro for an XDR union type"""
+    macro_name = get_header_name().upper() + "_" + node.name + "_sz"
+    template = get_jinja2_template(environment, "maxsize", "union")
+    print(
+        template.render(
+            macro=macro_name,
+            width=" + ".join(node.symbolic_width()),
+        )
+    )
+
+
+class XdrUnionGenerator(SourceGenerator):
+    """Generate source code for XDR unions"""
+
+    def __init__(self, language: str, peer: str):
+        """Initialize an instance of this class"""
+        self.environment = create_jinja2_environment(language, "union")
+        self.peer = peer
+
+    def emit_declaration(self, node: _XdrUnion) -> None:
+        """Emit one declaration pair for an XDR union"""
+        emit_union_declaration(self.environment, node)
+
+    def emit_definition(self, node: _XdrUnion) -> None:
+        """Emit one definition for an XDR union"""
+        emit_union_definition(self.environment, node)
+
+    def emit_decoder(self, node: _XdrUnion) -> None:
+        """Emit one decoder function for an XDR union"""
+        emit_union_decoder(self.environment, node)
+
+    def emit_encoder(self, node: _XdrUnion) -> None:
+        """Emit one encoder function for an XDR union"""
+        emit_union_encoder(self.environment, node)
+
+    def emit_maxsize(self, node: _XdrUnion) -> None:
+        """Emit one maxsize macro for an XDR union"""
+        emit_union_maxsize(self.environment, node)
diff --git a/tools/net/sunrpc/xdrgen/grammars/xdr.lark b/tools/net/sunrpc/xdrgen/grammars/xdr.lark
new file mode 100644
index 000000000..1d2afff98
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/grammars/xdr.lark
@@ -0,0 +1,127 @@
+// A Lark grammar for the XDR specification language based on
+// https://tools.ietf.org/html/rfc4506 Section 6.3
+
+declaration             : "opaque" identifier "[" value "]"            -> fixed_length_opaque
+                        | "opaque" identifier "<" [ value ] ">"        -> variable_length_opaque
+                        | "string" identifier "<" [ value ] ">"        -> string
+                        | type_specifier identifier "[" value "]"      -> fixed_length_array
+                        | type_specifier identifier "<" [ value ] ">"  -> variable_length_array
+                        | type_specifier "*" identifier                -> optional_data
+                        | type_specifier identifier                    -> basic
+                        | "void"                                       -> void
+
+value                   : decimal_constant
+                        | hexadecimal_constant
+                        | octal_constant
+                        | identifier
+
+constant                : decimal_constant | hexadecimal_constant | octal_constant
+
+type_specifier          : unsigned_hyper
+                        | unsigned_long
+                        | unsigned_int
+                        | unsigned_short
+                        | hyper
+                        | long
+                        | int
+                        | short
+                        | float
+                        | double
+                        | quadruple
+                        | bool
+                        | enum_type_spec
+                        | struct_type_spec
+                        | union_type_spec
+                        | identifier
+
+unsigned_hyper          : "unsigned" "hyper"
+unsigned_long           : "unsigned" "long"
+unsigned_int            : "unsigned" "int"
+unsigned_short          : "unsigned" "short"
+hyper                   : "hyper"
+long                    : "long"
+int                     : "int"
+short                   : "short"
+float                   : "float"
+double                  : "double"
+quadruple               : "quadruple"
+bool                    : "bool"
+
+enum_type_spec          : "enum" enum_body
+
+enum_body               : "{" ( identifier "=" value ) ( "," identifier "=" value )* "}"
+
+struct_type_spec        : "struct" struct_body
+
+struct_body             : "{" ( declaration ";" )+ "}"
+
+union_type_spec         : "union" union_body
+
+union_body              : switch_spec "{" case_spec+ [ default_spec ] "}"
+
+switch_spec             : "switch" "(" declaration ")"
+
+case_spec               : ( "case" value ":" )+ declaration ";"
+
+default_spec            : "default" ":" declaration ";"
+
+constant_def            : "const" identifier "=" value ";"
+
+type_def                : "typedef" declaration ";"                -> typedef
+                        | "enum" identifier enum_body ";"          -> enum
+                        | "struct" identifier struct_body ";"      -> struct
+                        | "union" identifier union_body ";"        -> union
+
+specification           : definition*
+
+definition              : constant_def
+                        | type_def
+                        | program_def
+                        | pragma_def
+                        | passthru_def
+
+passthru_def            : PASSTHRU
+
+//
+// RPC program definitions not specified in RFC 4506
+//
+
+program_def             : "program" identifier "{" version_def+ "}" "=" constant ";"
+
+version_def             : "version" identifier "{" procedure_def+ "}" "=" constant ";"
+
+procedure_def           : type_specifier identifier "(" type_specifier ")" "=" constant ";"
+
+pragma_def              : "pragma" directive identifier [ identifier ] ";"
+
+directive               : big_endian_directive
+                        | exclude_directive
+                        | header_directive
+                        | pages_directive
+                        | public_directive
+                        | skip_directive
+
+big_endian_directive    : "big_endian"
+exclude_directive       : "exclude"
+header_directive        : "header"
+pages_directive         : "pages"
+public_directive        : "public"
+skip_directive          : "skip"
+
+//
+// XDR language primitives
+//
+
+identifier              : /([a-z]|[A-Z])(_|[a-z]|[A-Z]|[0-9])*/
+
+decimal_constant        : /[\+-]?(0|[1-9][0-9]*)/
+hexadecimal_constant    : /0x([a-f]|[A-F]|[0-9])+/
+octal_constant          : /0[0-7]+/
+
+PASSTHRU                : /%.*/
+
+%import common.C_COMMENT
+%ignore C_COMMENT
+
+%import common.WS
+%ignore WS
diff --git a/tools/net/sunrpc/xdrgen/subcmds/__init__.py b/tools/net/sunrpc/xdrgen/subcmds/__init__.py
new file mode 100644
index 000000000..c940e9275
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/subcmds/__init__.py
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+# Just to make sphinx-apidoc document this directory
diff --git a/tools/net/sunrpc/xdrgen/subcmds/declarations.py b/tools/net/sunrpc/xdrgen/subcmds/declarations.py
new file mode 100644
index 000000000..f18761146
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/subcmds/declarations.py
@@ -0,0 +1,82 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Translate an XDR specification into executable code that
+can be compiled for the Linux kernel."""
+
+import logging
+
+from argparse import Namespace
+from lark import logger
+from lark.exceptions import VisitError
+
+from generators.enum import XdrEnumGenerator
+from generators.header_bottom import XdrHeaderBottomGenerator
+from generators.header_top import XdrHeaderTopGenerator
+from generators.pointer import XdrPointerGenerator
+from generators.program import XdrProgramGenerator
+from generators.typedef import XdrTypedefGenerator
+from generators.struct import XdrStructGenerator
+from generators.union import XdrUnionGenerator
+
+from xdr_ast import transform_parse_tree, _RpcProgram, Specification
+from xdr_ast import _XdrEnum, _XdrPointer, _XdrTypedef, _XdrStruct, _XdrUnion
+from xdr_ast import XdrSemanticError
+from xdr_parse import xdr_parser, set_xdr_annotate
+from xdr_parse import make_error_handler, XdrParseError
+from xdr_parse import handle_transform_error, handle_semantic_error
+
+logger.setLevel(logging.INFO)
+
+
+def emit_header_declarations(root: Specification, language: str, peer: str) -> None:
+    """Emit header declarations"""
+    for definition in root.definitions:
+        if isinstance(definition.value, _XdrEnum):
+            gen = XdrEnumGenerator(language, peer)
+        elif isinstance(definition.value, _XdrPointer):
+            gen = XdrPointerGenerator(language, peer)
+        elif isinstance(definition.value, _XdrTypedef):
+            gen = XdrTypedefGenerator(language, peer)
+        elif isinstance(definition.value, _XdrStruct):
+            gen = XdrStructGenerator(language, peer)
+        elif isinstance(definition.value, _XdrUnion):
+            gen = XdrUnionGenerator(language, peer)
+        elif isinstance(definition.value, _RpcProgram):
+            gen = XdrProgramGenerator(language, peer)
+        else:
+            continue
+        gen.emit_declaration(definition.value)
+
+
+def subcmd(args: Namespace) -> int:
+    """Generate definitions and declarations"""
+
+    set_xdr_annotate(args.annotate)
+    parser = xdr_parser()
+    with open(args.filename, encoding="utf-8") as f:
+        source = f.read()
+        try:
+            parse_tree = parser.parse(
+                source, on_error=make_error_handler(source, args.filename)
+            )
+        except XdrParseError:
+            return 1
+        try:
+            ast = transform_parse_tree(parse_tree)
+        except VisitError as e:
+            handle_transform_error(e, source, args.filename)
+            return 1
+        except XdrSemanticError as e:
+            handle_semantic_error(e, source, args.filename)
+            return 1
+
+        gen = XdrHeaderTopGenerator(args.language, args.peer)
+        gen.emit_declaration(args.filename, ast)
+
+        emit_header_declarations(ast, args.language, args.peer)
+
+        gen = XdrHeaderBottomGenerator(args.language, args.peer)
+        gen.emit_declaration(args.filename, ast)
+
+    return 0
diff --git a/tools/net/sunrpc/xdrgen/subcmds/definitions.py b/tools/net/sunrpc/xdrgen/subcmds/definitions.py
new file mode 100644
index 000000000..77b666943
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/subcmds/definitions.py
@@ -0,0 +1,110 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Translate an XDR specification into executable code that
+can be compiled for the Linux kernel."""
+
+import logging
+
+from argparse import Namespace
+from lark import logger
+from lark.exceptions import VisitError
+
+from generators.constant import XdrConstantGenerator
+from generators.enum import XdrEnumGenerator
+from generators.header_bottom import XdrHeaderBottomGenerator
+from generators.header_top import XdrHeaderTopGenerator
+from generators.passthru import XdrPassthruGenerator
+from generators.pointer import XdrPointerGenerator
+from generators.program import XdrProgramGenerator
+from generators.typedef import XdrTypedefGenerator
+from generators.struct import XdrStructGenerator
+from generators.union import XdrUnionGenerator
+
+from xdr_ast import transform_parse_tree, Specification, XdrSemanticError
+from xdr_ast import _RpcProgram, _XdrConstant, _XdrEnum, _XdrPassthru, _XdrPointer
+from xdr_ast import _XdrTypedef, _XdrStruct, _XdrUnion
+from xdr_parse import xdr_parser, set_xdr_annotate
+from xdr_parse import make_error_handler, XdrParseError
+from xdr_parse import handle_transform_error, handle_semantic_error
+
+logger.setLevel(logging.INFO)
+
+
+def emit_header_definitions(root: Specification, language: str, peer: str) -> None:
+    """Emit header definitions"""
+    for definition in root.definitions:
+        if isinstance(definition.value, _XdrConstant):
+            gen = XdrConstantGenerator(language, peer)
+        elif isinstance(definition.value, _XdrEnum):
+            gen = XdrEnumGenerator(language, peer)
+        elif isinstance(definition.value, _XdrPointer):
+            gen = XdrPointerGenerator(language, peer)
+        elif isinstance(definition.value, _RpcProgram):
+            gen = XdrProgramGenerator(language, peer)
+        elif isinstance(definition.value, _XdrTypedef):
+            gen = XdrTypedefGenerator(language, peer)
+        elif isinstance(definition.value, _XdrStruct):
+            gen = XdrStructGenerator(language, peer)
+        elif isinstance(definition.value, _XdrUnion):
+            gen = XdrUnionGenerator(language, peer)
+        elif isinstance(definition.value, _XdrPassthru):
+            gen = XdrPassthruGenerator(language, peer)
+        else:
+            continue
+        gen.emit_definition(definition.value)
+
+
+def emit_header_maxsize(root: Specification, language: str, peer: str) -> None:
+    """Emit header maxsize macros"""
+    print("")
+    for definition in root.definitions:
+        if isinstance(definition.value, _XdrEnum):
+            gen = XdrEnumGenerator(language, peer)
+        elif isinstance(definition.value, _XdrPointer):
+            gen = XdrPointerGenerator(language, peer)
+        elif isinstance(definition.value, _XdrTypedef):
+            gen = XdrTypedefGenerator(language, peer)
+        elif isinstance(definition.value, _XdrStruct):
+            gen = XdrStructGenerator(language, peer)
+        elif isinstance(definition.value, _XdrUnion):
+            gen = XdrUnionGenerator(language, peer)
+        elif isinstance(definition.value, _RpcProgram):
+            gen = XdrProgramGenerator(language, peer)
+        else:
+            continue
+        gen.emit_maxsize(definition.value)
+
+
+def subcmd(args: Namespace) -> int:
+    """Generate definitions"""
+
+    set_xdr_annotate(args.annotate)
+    parser = xdr_parser()
+    with open(args.filename, encoding="utf-8") as f:
+        source = f.read()
+        try:
+            parse_tree = parser.parse(
+                source, on_error=make_error_handler(source, args.filename)
+            )
+        except XdrParseError:
+            return 1
+        try:
+            ast = transform_parse_tree(parse_tree)
+        except VisitError as e:
+            handle_transform_error(e, source, args.filename)
+            return 1
+        except XdrSemanticError as e:
+            handle_semantic_error(e, source, args.filename)
+            return 1
+
+        gen = XdrHeaderTopGenerator(args.language, args.peer)
+        gen.emit_definition(args.filename, ast)
+
+        emit_header_definitions(ast, args.language, args.peer)
+        emit_header_maxsize(ast, args.language, args.peer)
+
+        gen = XdrHeaderBottomGenerator(args.language, args.peer)
+        gen.emit_definition(args.filename, ast)
+
+    return 0
diff --git a/tools/net/sunrpc/xdrgen/subcmds/lint.py b/tools/net/sunrpc/xdrgen/subcmds/lint.py
new file mode 100644
index 000000000..b4ea0f55f
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/subcmds/lint.py
@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Translate an XDR specification into executable code that
+can be compiled for the Linux kernel."""
+
+import logging
+
+from argparse import Namespace
+from lark import logger
+from lark.exceptions import VisitError
+
+from xdr_parse import xdr_parser, make_error_handler, XdrParseError
+from xdr_parse import handle_transform_error, handle_semantic_error
+from xdr_ast import transform_parse_tree, XdrSemanticError
+
+logger.setLevel(logging.DEBUG)
+
+
+def subcmd(args: Namespace) -> int:
+    """Lexical and syntax check of an XDR specification"""
+
+    parser = xdr_parser()
+    with open(args.filename, encoding="utf-8") as f:
+        source = f.read()
+        try:
+            parse_tree = parser.parse(
+                source, on_error=make_error_handler(source, args.filename)
+            )
+        except XdrParseError:
+            return 1
+        try:
+            transform_parse_tree(parse_tree)
+        except VisitError as e:
+            handle_transform_error(e, source, args.filename)
+            return 1
+        except XdrSemanticError as e:
+            handle_semantic_error(e, source, args.filename)
+            return 1
+
+    return 0
diff --git a/tools/net/sunrpc/xdrgen/subcmds/source.py b/tools/net/sunrpc/xdrgen/subcmds/source.py
new file mode 100644
index 000000000..56eba34d8
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/subcmds/source.py
@@ -0,0 +1,137 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Translate an XDR specification into executable code that
+can be compiled for the Linux kernel."""
+
+import logging
+
+from argparse import Namespace
+from lark import logger
+from lark.exceptions import VisitError
+
+from generators.source_top import XdrSourceTopGenerator
+from generators.enum import XdrEnumGenerator
+from generators.passthru import XdrPassthruGenerator
+from generators.pointer import XdrPointerGenerator
+from generators.program import XdrProgramGenerator
+from generators.typedef import XdrTypedefGenerator
+from generators.struct import XdrStructGenerator
+from generators.union import XdrUnionGenerator
+
+from xdr_ast import transform_parse_tree, _RpcProgram, Specification
+from xdr_ast import _XdrAst, _XdrEnum, _XdrPassthru, _XdrPointer
+from xdr_ast import _XdrStruct, _XdrTypedef, _XdrUnion, XdrSemanticError
+
+from xdr_parse import xdr_parser, set_xdr_annotate, set_xdr_enum_validation
+from xdr_parse import make_error_handler, XdrParseError
+from xdr_parse import handle_transform_error, handle_semantic_error
+
+logger.setLevel(logging.INFO)
+
+
+def emit_source_decoder(node: _XdrAst, language: str, peer: str) -> None:
+    """Emit one XDR decoder function for a source file"""
+    if isinstance(node, _XdrEnum):
+        gen = XdrEnumGenerator(language, peer)
+    elif isinstance(node, _XdrPointer):
+        gen = XdrPointerGenerator(language, peer)
+    elif isinstance(node, _XdrTypedef):
+        gen = XdrTypedefGenerator(language, peer)
+    elif isinstance(node, _XdrStruct):
+        gen = XdrStructGenerator(language, peer)
+    elif isinstance(node, _XdrUnion):
+        gen = XdrUnionGenerator(language, peer)
+    elif isinstance(node, _RpcProgram):
+        gen = XdrProgramGenerator(language, peer)
+    else:
+        return
+    gen.emit_decoder(node)
+
+
+def emit_source_encoder(node: _XdrAst, language: str, peer: str) -> None:
+    """Emit one XDR encoder function for a source file"""
+    if isinstance(node, _XdrEnum):
+        gen = XdrEnumGenerator(language, peer)
+    elif isinstance(node, _XdrPointer):
+        gen = XdrPointerGenerator(language, peer)
+    elif isinstance(node, _XdrTypedef):
+        gen = XdrTypedefGenerator(language, peer)
+    elif isinstance(node, _XdrStruct):
+        gen = XdrStructGenerator(language, peer)
+    elif isinstance(node, _XdrUnion):
+        gen = XdrUnionGenerator(language, peer)
+    elif isinstance(node, _RpcProgram):
+        gen = XdrProgramGenerator(language, peer)
+    else:
+        return
+    gen.emit_encoder(node)
+
+
+def generate_server_source(filename: str, root: Specification, language: str) -> None:
+    """Generate server-side source code"""
+
+    gen = XdrSourceTopGenerator(language, "server")
+    gen.emit_source(filename, root)
+
+    for definition in root.definitions:
+        if isinstance(definition.value, _XdrPassthru):
+            passthru_gen = XdrPassthruGenerator(language, "server")
+            passthru_gen.emit_decoder(definition.value)
+        else:
+            emit_source_decoder(definition.value, language, "server")
+    for definition in root.definitions:
+        if not isinstance(definition.value, _XdrPassthru):
+            emit_source_encoder(definition.value, language, "server")
+
+
+def generate_client_source(filename: str, root: Specification, language: str) -> None:
+    """Generate client-side source code"""
+
+    gen = XdrSourceTopGenerator(language, "client")
+    gen.emit_source(filename, root)
+
+    for definition in root.definitions:
+        if isinstance(definition.value, _XdrPassthru):
+            passthru_gen = XdrPassthruGenerator(language, "client")
+            passthru_gen.emit_decoder(definition.value)
+        else:
+            emit_source_encoder(definition.value, language, "client")
+    for definition in root.definitions:
+        if not isinstance(definition.value, _XdrPassthru):
+            emit_source_decoder(definition.value, language, "client")
+
+    # cel: todo: client needs PROC macros
+
+
+def subcmd(args: Namespace) -> int:
+    """Generate encoder and decoder functions"""
+
+    set_xdr_annotate(args.annotate)
+    set_xdr_enum_validation(not args.no_enum_validation)
+    parser = xdr_parser()
+    with open(args.filename, encoding="utf-8") as f:
+        source = f.read()
+        try:
+            parse_tree = parser.parse(
+                source, on_error=make_error_handler(source, args.filename)
+            )
+        except XdrParseError:
+            return 1
+        try:
+            ast = transform_parse_tree(parse_tree)
+        except VisitError as e:
+            handle_transform_error(e, source, args.filename)
+            return 1
+        except XdrSemanticError as e:
+            handle_semantic_error(e, source, args.filename)
+            return 1
+        match args.peer:
+            case "server":
+                generate_server_source(args.filename, ast, args.language)
+            case "client":
+                generate_client_source(args.filename, ast, args.language)
+            case _:
+                print("Code generation for", args.peer, "is not yet supported")
+
+    return 0
diff --git a/tools/net/sunrpc/xdrgen/templates/C/constants/definition.j2 b/tools/net/sunrpc/xdrgen/templates/C/constants/definition.j2
new file mode 100644
index 000000000..d648ca419
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/constants/definition.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+enum { {{ name }} = {{ value }} };
diff --git a/tools/net/sunrpc/xdrgen/templates/C/enum/declaration/enum.j2 b/tools/net/sunrpc/xdrgen/templates/C/enum/declaration/enum.j2
new file mode 100644
index 000000000..d1405c7c5
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/enum/declaration/enum.j2
@@ -0,0 +1,4 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+bool xdrgen_decode_{{ name }}(struct xdr_stream *xdr, {{ name }} *ptr);
+bool xdrgen_encode_{{ name }}(struct xdr_stream *xdr, {{ name }} value);
diff --git a/tools/net/sunrpc/xdrgen/templates/C/enum/decoder/enum.j2 b/tools/net/sunrpc/xdrgen/templates/C/enum/decoder/enum.j2
new file mode 100644
index 000000000..735a34157
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/enum/decoder/enum.j2
@@ -0,0 +1,30 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* enum {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_decode_{{ name }}(struct xdr_stream *xdr, {{ name }} *ptr)
+{
+	u32 val;
+
+	if (xdr_stream_decode_u32(xdr, &val) < 0)
+		return false;
+{% if validate and enumerators %}
+	/* Compiler may optimize to a range check for dense enums */
+	switch (val) {
+{% for e in enumerators %}
+	case {{ e.name }}:
+{% endfor %}
+		break;
+	default:
+		return false;
+	}
+{% endif %}
+	*ptr = val;
+	return true;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/enum/decoder/enum_be.j2 b/tools/net/sunrpc/xdrgen/templates/C/enum/decoder/enum_be.j2
new file mode 100644
index 000000000..82782a510
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/enum/decoder/enum_be.j2
@@ -0,0 +1,34 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* enum {{ name }} (big-endian) */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_decode_{{ name }}(struct xdr_stream *xdr, {{ name }} *ptr)
+{
+{% if validate and enumerators %}
+	__be32 raw;
+	u32 val;
+
+	if (xdr_stream_decode_be32(xdr, &raw) < 0)
+		return false;
+	val = be32_to_cpu(raw);
+	/* Compiler may optimize to a range check for dense enums */
+	switch (val) {
+{% for e in enumerators %}
+	case {{ e.name }}:
+{% endfor %}
+		break;
+	default:
+		return false;
+	}
+	*ptr = raw;
+	return true;
+{% else %}
+	return xdr_stream_decode_be32(xdr, ptr) == 0;
+{% endif %}
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/enum/definition/close.j2 b/tools/net/sunrpc/xdrgen/templates/C/enum/definition/close.j2
new file mode 100644
index 000000000..446266ad6
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/enum/definition/close.j2
@@ -0,0 +1,4 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+};
+
+typedef enum {{ name }} {{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/enum/definition/close_be.j2 b/tools/net/sunrpc/xdrgen/templates/C/enum/definition/close_be.j2
new file mode 100644
index 000000000..cfeee2287
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/enum/definition/close_be.j2
@@ -0,0 +1,4 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+};
+
+typedef __be32 {{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/enum/definition/enumerator.j2 b/tools/net/sunrpc/xdrgen/templates/C/enum/definition/enumerator.j2
new file mode 100644
index 000000000..ff0b893b8
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/enum/definition/enumerator.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+	{{ name }} = {{ value }},
diff --git a/tools/net/sunrpc/xdrgen/templates/C/enum/definition/open.j2 b/tools/net/sunrpc/xdrgen/templates/C/enum/definition/open.j2
new file mode 100644
index 000000000..b25335221
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/enum/definition/open.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+enum {{ name }} {
diff --git a/tools/net/sunrpc/xdrgen/templates/C/enum/encoder/enum.j2 b/tools/net/sunrpc/xdrgen/templates/C/enum/encoder/enum.j2
new file mode 100644
index 000000000..67245b9a9
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/enum/encoder/enum.j2
@@ -0,0 +1,14 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* enum {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_encode_{{ name }}(struct xdr_stream *xdr, {{ name }} value)
+{
+	return xdr_stream_encode_u32(xdr, value) == XDR_UNIT;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/enum/encoder/enum_be.j2 b/tools/net/sunrpc/xdrgen/templates/C/enum/encoder/enum_be.j2
new file mode 100644
index 000000000..fbbcc4594
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/enum/encoder/enum_be.j2
@@ -0,0 +1,14 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* enum {{ name }} (big-endian) */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_encode_{{ name }}(struct xdr_stream *xdr, {{ name }} value)
+{
+	return xdr_stream_encode_be32(xdr, value) == XDR_UNIT;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/enum/maxsize/enum.j2 b/tools/net/sunrpc/xdrgen/templates/C/enum/maxsize/enum.j2
new file mode 100644
index 000000000..45c1d4c21
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/enum/maxsize/enum.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+#define {{ '{:<31}'.format(macro) }} ({{ width }})
diff --git a/tools/net/sunrpc/xdrgen/templates/C/header_bottom/declaration/header.j2 b/tools/net/sunrpc/xdrgen/templates/C/header_bottom/declaration/header.j2
new file mode 100644
index 000000000..0bb8c6fc0
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/header_bottom/declaration/header.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+#endif /* _LINUX_XDRGEN_{{ infix }}_DECL_H */
diff --git a/tools/net/sunrpc/xdrgen/templates/C/header_bottom/definition/header.j2 b/tools/net/sunrpc/xdrgen/templates/C/header_bottom/definition/header.j2
new file mode 100644
index 000000000..69069d08d
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/header_bottom/definition/header.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+#endif /* _LINUX_XDRGEN_{{ infix }}_DEF_H */
diff --git a/tools/net/sunrpc/xdrgen/templates/C/header_top/declaration/header.j2 b/tools/net/sunrpc/xdrgen/templates/C/header_top/declaration/header.j2
new file mode 100644
index 000000000..ebb4e1d32
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/header_top/declaration/header.j2
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Generated by xdrgen. Manual edits will be lost. */
+/* XDR specification file: {{ filename }} */
+/* XDR specification modification time: {{ mtime }} */
+
+#ifndef _LINUX_XDRGEN_{{ infix }}_DECL_H
+#define _LINUX_XDRGEN_{{ infix }}_DECL_H
+
+#include <linux/types.h>
+
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/xdrgen/_defs.h>
+#include <linux/sunrpc/xdrgen/_builtins.h>
+#include <linux/sunrpc/xdrgen/{{ infix.lower() }}.h>
diff --git a/tools/net/sunrpc/xdrgen/templates/C/header_top/definition/header.j2 b/tools/net/sunrpc/xdrgen/templates/C/header_top/definition/header.j2
new file mode 100644
index 000000000..92f1fd4ba
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/header_top/definition/header.j2
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Generated by xdrgen. Manual edits will be lost. */
+/* XDR specification file: {{ filename }} */
+/* XDR specification modification time: {{ mtime }} */
+
+#ifndef _LINUX_XDRGEN_{{ infix }}_DEF_H
+#define _LINUX_XDRGEN_{{ infix }}_DEF_H
+
+#include <linux/types.h>
+#include <linux/sunrpc/xdrgen/_defs.h>
diff --git a/tools/net/sunrpc/xdrgen/templates/C/passthru/definition.j2 b/tools/net/sunrpc/xdrgen/templates/C/passthru/definition.j2
new file mode 100644
index 000000000..900c7516a
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/passthru/definition.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{{ content }}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/passthru/source.j2 b/tools/net/sunrpc/xdrgen/templates/C/passthru/source.j2
new file mode 100644
index 000000000..900c7516a
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/passthru/source.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{{ content }}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/declaration/close.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/declaration/close.j2
new file mode 100644
index 000000000..816291184
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/declaration/close.j2
@@ -0,0 +1,4 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+bool xdrgen_decode_{{ name }}(struct xdr_stream *xdr, struct {{ name }} *ptr);
+bool xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const struct {{ name }} *value);
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/basic.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/basic.j2
new file mode 100644
index 000000000..cde4ab53f
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/basic.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (basic) */
+{% endif %}
+	if (!xdrgen_decode_{{ type }}(xdr, &ptr->{{ name }}))
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/close.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/close.j2
new file mode 100644
index 000000000..3dbd724d7
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/close.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+	return true;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/fixed_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/fixed_length_array.j2
new file mode 100644
index 000000000..cfd64217a
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/fixed_length_array.j2
@@ -0,0 +1,8 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (fixed-length array) */
+{% endif %}
+	for (u32 i = 0; i < {{ size }}; i++) {
+		if (xdrgen_decode_{{ type }}(xdr, &ptr->{{ name }}.items[i]) < 0)
+			return false;
+	}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/fixed_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/fixed_length_opaque.j2
new file mode 100644
index 000000000..b4695ece1
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/fixed_length_opaque.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (fixed-length opaque) */
+{% endif %}
+	if (xdr_stream_decode_opaque_fixed(xdr, ptr->{{ name }}, {{ size }}) < 0)
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/open.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/open.j2
new file mode 100644
index 000000000..c093d9e3c
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/open.j2
@@ -0,0 +1,22 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* pointer {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_decode_{{ name }}(struct xdr_stream *xdr, struct {{ name }} *ptr)
+{
+	bool opted;
+
+{% if annotate %}
+	/* opted */
+{% endif %}
+	if (!xdrgen_decode_bool(xdr, &opted))
+		return false;
+	if (!opted)
+		return true;
+
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/optional_data.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/optional_data.j2
new file mode 100644
index 000000000..b6834299a
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/optional_data.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (optional data) */
+{% endif %}
+	if (!xdrgen_decode_{{ type }}(xdr, ptr->{{ name }}))
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/string.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/string.j2
new file mode 100644
index 000000000..12d20b143
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/string.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (variable-length string) */
+{% endif %}
+	if (!xdrgen_decode_string(xdr, (string *)ptr, {{ maxsize }}))
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/variable_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/variable_length_array.j2
new file mode 100644
index 000000000..2f943909c
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/variable_length_array.j2
@@ -0,0 +1,13 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (variable-length array) */
+{% endif %}
+	if (xdr_stream_decode_u32(xdr, &ptr->{{ name }}.count) < 0)
+		return false;
+{% if maxsize != "0" %}
+	if (ptr->{{ name }}.count > {{ maxsize }})
+		return false;
+{% endif %}
+	for (u32 i = 0; i < ptr->{{ name }}.count; i++)
+		if (!xdrgen_decode_{{ type }}(xdr, &ptr->{{ name }}.element[i]))
+			return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/variable_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/variable_length_opaque.j2
new file mode 100644
index 000000000..9a814de54
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/decoder/variable_length_opaque.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (variable-length opaque) */
+{% endif %}
+	if (!xdrgen_decode_opaque(xdr, (opaque *)ptr, {{ maxsize }}))
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/basic.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/basic.j2
new file mode 100644
index 000000000..b3430895f
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/basic.j2
@@ -0,0 +1,5 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* (basic) */
+{% endif %}
+	{{ classifier }}{{ type }} {{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/close.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/close.j2
new file mode 100644
index 000000000..9e62344a9
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/close.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/fixed_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/fixed_length_array.j2
new file mode 100644
index 000000000..66be83682
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/fixed_length_array.j2
@@ -0,0 +1,5 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* (fixed-length array) */
+{% endif %}
+	{{ type }} {{ name }}[{{ size }}];
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/fixed_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/fixed_length_opaque.j2
new file mode 100644
index 000000000..0daba19aa
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/fixed_length_opaque.j2
@@ -0,0 +1,5 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* (fixed-length opaque) */
+{% endif %}
+	u8 {{ name }}[{{ size }}];
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/open.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/open.j2
new file mode 100644
index 000000000..bc886b818
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/open.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* pointer {{ name }} */
+{% endif %}
+struct {{ name }} {
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/optional_data.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/optional_data.j2
new file mode 100644
index 000000000..a33341f45
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/optional_data.j2
@@ -0,0 +1,5 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* (optional data) */
+{% endif %}
+	{{ classifier }}{{ type }} *{{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/string.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/string.j2
new file mode 100644
index 000000000..2de2feec7
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/string.j2
@@ -0,0 +1,5 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* (variable-length string) */
+{% endif %}
+	string {{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/variable_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/variable_length_array.j2
new file mode 100644
index 000000000..5d767f9b3
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/variable_length_array.j2
@@ -0,0 +1,8 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* (variable-length array) */
+{% endif %}
+	struct {
+		u32 count;
+		{{ classifier }}{{ type }} *element;
+	} {{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/variable_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/variable_length_opaque.j2
new file mode 100644
index 000000000..4d0cd84be
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/definition/variable_length_opaque.j2
@@ -0,0 +1,5 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* (variable-length opaque) */
+{% endif %}
+	opaque {{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/basic.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/basic.j2
new file mode 100644
index 000000000..a7d3695c5
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/basic.j2
@@ -0,0 +1,10 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (basic) */
+{% endif %}
+{% if type in pass_by_reference %}
+	if (!xdrgen_encode_{{ type }}(xdr, &value->{{ name }}))
+{% else %}
+	if (!xdrgen_encode_{{ type }}(xdr, value->{{ name }}))
+{% endif %}
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/close.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/close.j2
new file mode 100644
index 000000000..3dbd724d7
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/close.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+	return true;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/fixed_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/fixed_length_array.j2
new file mode 100644
index 000000000..b01833a2c
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/fixed_length_array.j2
@@ -0,0 +1,12 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (fixed-length array) */
+{% endif %}
+	for (u32 i = 0; i < {{ size }}; i++) {
+{% if type in pass_by_reference %}
+		if (xdrgen_encode_{{ type }}(xdr, &value->items[i]) < 0)
+{% else %}
+		if (xdrgen_encode_{{ type }}(xdr, value->items[i]) < 0)
+{% endif %}
+			return false;
+	}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/fixed_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/fixed_length_opaque.j2
new file mode 100644
index 000000000..07bc91919
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/fixed_length_opaque.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (fixed-length opaque) */
+{% endif %}
+	if (xdr_stream_encode_opaque_fixed(xdr, value->{{ name }}, {{ size }}) < 0)
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/open.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/open.j2
new file mode 100644
index 000000000..d67fae200
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/open.j2
@@ -0,0 +1,20 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* pointer {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const struct {{ name }} *value)
+{
+{% if annotate %}
+	/* opted */
+{% endif %}
+	if (!xdrgen_encode_bool(xdr, value != NULL))
+		return false;
+	if (!value)
+		return true;
+
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/optional_data.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/optional_data.j2
new file mode 100644
index 000000000..16fb3e09b
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/optional_data.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (optional data) */
+{% endif %}
+	if (!xdrgen_encode_{{ type }}(xdr, value->{{ name }}))
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/string.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/string.j2
new file mode 100644
index 000000000..7ddc2bf3e
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/string.j2
@@ -0,0 +1,10 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (variable-length string) */
+{% endif %}
+{% if maxsize != "0" %}
+	if (value->{{ name }}.len > {{ maxsize }})
+		return false;
+{% endif %}
+	if (xdr_stream_encode_opaque(xdr, value->{{ name }}.data, value->{{ name }}.len) < 0)
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/variable_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/variable_length_array.j2
new file mode 100644
index 000000000..b21476629
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/variable_length_array.j2
@@ -0,0 +1,17 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (variable-length array) */
+{% endif %}
+{% if maxsize != "0" %}
+	if (value->{{ name }}.count > {{ maxsize }})
+		return false;
+{% endif %}
+	if (xdr_stream_encode_u32(xdr, value->{{ name }}.count) != XDR_UNIT)
+		return false;
+	for (u32 i = 0; i < value->{{ name }}.count; i++)
+{% if type in pass_by_reference %}
+		if (!xdrgen_encode_{{ type }}(xdr, &value->{{ name }}.element[i]))
+{% else %}
+		if (!xdrgen_encode_{{ type }}(xdr, value->{{ name }}.element[i]))
+{% endif %}
+			return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/variable_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/variable_length_opaque.j2
new file mode 100644
index 000000000..5bf00070a
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/encoder/variable_length_opaque.j2
@@ -0,0 +1,10 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (variable-length opaque) */
+{% endif %}
+{% if maxsize != "0" %}
+	if (value->{{ name }}.len > {{ maxsize }})
+		return false;
+{% endif %}
+	if (xdr_stream_encode_opaque(xdr, value->{{ name }}.data, value->{{ name }}.len) < 0)
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/pointer/maxsize/pointer.j2 b/tools/net/sunrpc/xdrgen/templates/C/pointer/maxsize/pointer.j2
new file mode 100644
index 000000000..9f3bfb47d
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/pointer/maxsize/pointer.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+#define {{ '{:<31}'.format(macro) }} \
+	({{ width }})
diff --git a/tools/net/sunrpc/xdrgen/templates/C/program/declaration/argument.j2 b/tools/net/sunrpc/xdrgen/templates/C/program/declaration/argument.j2
new file mode 100644
index 000000000..4364fed19
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/program/declaration/argument.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+bool {{ program }}_svc_decode_{{ argument }}(struct svc_rqst *rqstp, struct xdr_stream *xdr);
diff --git a/tools/net/sunrpc/xdrgen/templates/C/program/declaration/result.j2 b/tools/net/sunrpc/xdrgen/templates/C/program/declaration/result.j2
new file mode 100644
index 000000000..e0ea1e849
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/program/declaration/result.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+bool {{ program }}_svc_encode_{{ result }}(struct svc_rqst *rqstp, struct xdr_stream *xdr);
diff --git a/tools/net/sunrpc/xdrgen/templates/C/program/decoder/argument.j2 b/tools/net/sunrpc/xdrgen/templates/C/program/decoder/argument.j2
new file mode 100644
index 000000000..096d553b2
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/program/decoder/argument.j2
@@ -0,0 +1,21 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+/**
+ * {{ program }}_svc_decode_{{ argument }} - Decode a {{ argument }} argument
+ * @rqstp: RPC transaction context
+ * @xdr: source XDR data stream
+ *
+ * Return values:
+ *   %true: procedure arguments decoded successfully
+ *   %false: decode failed
+ */
+bool {{ program }}_svc_decode_{{ argument }}(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+{% if argument in structs %}
+	struct {{ argument }} *argp = rqstp->rq_argp;
+{% else %}
+	{{ argument }} *argp = rqstp->rq_argp;
+{% endif %}
+
+	return xdrgen_decode_{{ argument }}(xdr, argp);
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/program/decoder/result.j2 b/tools/net/sunrpc/xdrgen/templates/C/program/decoder/result.j2
new file mode 100644
index 000000000..aa9940e32
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/program/decoder/result.j2
@@ -0,0 +1,18 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* Decode {{ result }} results */
+{% endif %}
+static int {{ program }}_xdr_dec_{{ result }}(struct rpc_rqst *req,
+		struct xdr_stream *xdr, void *data)
+{
+{% if result == 'void' %}
+	xdrgen_decode_void(xdr);
+{% else %}
+	struct {{ result }} *result = data;
+
+	if (!xdrgen_decode_{{ result }}(xdr, result))
+		return -EIO;
+{% endif %}
+	return 0;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/program/definition/close.j2 b/tools/net/sunrpc/xdrgen/templates/C/program/definition/close.j2
new file mode 100644
index 000000000..9e62344a9
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/program/definition/close.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/program/definition/open.j2 b/tools/net/sunrpc/xdrgen/templates/C/program/definition/open.j2
new file mode 100644
index 000000000..f9a6d439f
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/program/definition/open.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* procedure numbers for {{ program }} */
+{% endif %}
+enum {
diff --git a/tools/net/sunrpc/xdrgen/templates/C/program/definition/procedure.j2 b/tools/net/sunrpc/xdrgen/templates/C/program/definition/procedure.j2
new file mode 100644
index 000000000..ff0b893b8
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/program/definition/procedure.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+	{{ name }} = {{ value }},
diff --git a/tools/net/sunrpc/xdrgen/templates/C/program/definition/program.j2 b/tools/net/sunrpc/xdrgen/templates/C/program/definition/program.j2
new file mode 100644
index 000000000..320663ffc
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/program/definition/program.j2
@@ -0,0 +1,5 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+#ifndef {{ name }}
+#define {{ name }} ({{ value }})
+#endif
diff --git a/tools/net/sunrpc/xdrgen/templates/C/program/encoder/argument.j2 b/tools/net/sunrpc/xdrgen/templates/C/program/encoder/argument.j2
new file mode 100644
index 000000000..2fbb5bd13
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/program/encoder/argument.j2
@@ -0,0 +1,16 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{%if annotate %}
+/* Encode {{ argument }} arguments */
+{% endif %}
+static void {{ program }}_xdr_enc_{{ argument }}(struct rpc_rqst *req,
+		struct xdr_stream *xdr, const void *data)
+{
+{% if argument == 'void' %}
+	xdrgen_encode_void(xdr);
+{% else %}
+	const struct {{ argument }} *args = data;
+
+	xdrgen_encode_{{ argument }}(xdr, args);
+{% endif %}
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/program/encoder/result.j2 b/tools/net/sunrpc/xdrgen/templates/C/program/encoder/result.j2
new file mode 100644
index 000000000..4243d9196
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/program/encoder/result.j2
@@ -0,0 +1,23 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+/**
+ * {{ program }}_svc_encode_{{ result }} - Encode a {{ result }} result
+ * @rqstp: RPC transaction context
+ * @xdr: target XDR data stream
+ *
+ * Return values:
+ *   %true: procedure results encoded successfully
+ *   %false: encode failed
+ */
+bool {{ program }}_svc_encode_{{ result }}(struct svc_rqst *rqstp, struct xdr_stream *xdr)
+{
+{% if result in structs %}
+	struct {{ result }} *resp = rqstp->rq_resp;
+
+	return xdrgen_encode_{{ result }}(xdr, resp);
+{% else %}
+	{{ result }} *resp = rqstp->rq_resp;
+
+	return xdrgen_encode_{{ result }}(xdr, *resp);
+{% endif %}
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/program/maxsize/max_args.j2 b/tools/net/sunrpc/xdrgen/templates/C/program/maxsize/max_args.j2
new file mode 100644
index 000000000..9f3bfb47d
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/program/maxsize/max_args.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+#define {{ '{:<31}'.format(macro) }} \
+	({{ width }})
diff --git a/tools/net/sunrpc/xdrgen/templates/C/source_top/client.j2 b/tools/net/sunrpc/xdrgen/templates/C/source_top/client.j2
new file mode 100644
index 000000000..df3598c38
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/source_top/client.j2
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+// Generated by xdrgen. Manual edits will be lost.
+// XDR specification file: {{ filename }}
+// XDR specification modification time: {{ mtime }}
+
+#include <linux/types.h>
+
+#include <linux/sunrpc/xdr.h>
+#include <linux/sunrpc/xdrgen/_defs.h>
+#include <linux/sunrpc/xdrgen/_builtins.h>
+
+#include <linux/sunrpc/clnt.h>
diff --git a/tools/net/sunrpc/xdrgen/templates/C/source_top/server.j2 b/tools/net/sunrpc/xdrgen/templates/C/source_top/server.j2
new file mode 100644
index 000000000..974e1d971
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/source_top/server.j2
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
+// Generated by xdrgen. Manual edits will be lost.
+// XDR specification file: {{ filename }}
+// XDR specification modification time: {{ mtime }}
+
+#include <linux/sunrpc/svc.h>
+
+#include "{{ program }}xdr_gen.h"
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/declaration/close.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/declaration/close.j2
new file mode 100644
index 000000000..816291184
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/declaration/close.j2
@@ -0,0 +1,4 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+bool xdrgen_decode_{{ name }}(struct xdr_stream *xdr, struct {{ name }} *ptr);
+bool xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const struct {{ name }} *value);
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/basic.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/basic.j2
new file mode 100644
index 000000000..cde4ab53f
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/basic.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (basic) */
+{% endif %}
+	if (!xdrgen_decode_{{ type }}(xdr, &ptr->{{ name }}))
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/close.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/close.j2
new file mode 100644
index 000000000..3dbd724d7
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/close.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+	return true;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/fixed_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/fixed_length_array.j2
new file mode 100644
index 000000000..cfd64217a
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/fixed_length_array.j2
@@ -0,0 +1,8 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (fixed-length array) */
+{% endif %}
+	for (u32 i = 0; i < {{ size }}; i++) {
+		if (xdrgen_decode_{{ type }}(xdr, &ptr->{{ name }}.items[i]) < 0)
+			return false;
+	}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/fixed_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/fixed_length_opaque.j2
new file mode 100644
index 000000000..b4695ece1
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/fixed_length_opaque.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (fixed-length opaque) */
+{% endif %}
+	if (xdr_stream_decode_opaque_fixed(xdr, ptr->{{ name }}, {{ size }}) < 0)
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/open.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/open.j2
new file mode 100644
index 000000000..289e67259
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/open.j2
@@ -0,0 +1,12 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* struct {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_decode_{{ name }}(struct xdr_stream *xdr, struct {{ name }} *ptr)
+{
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/optional_data.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/optional_data.j2
new file mode 100644
index 000000000..b6834299a
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/optional_data.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (optional data) */
+{% endif %}
+	if (!xdrgen_decode_{{ type }}(xdr, ptr->{{ name }}))
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/string.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/string.j2
new file mode 100644
index 000000000..12d20b143
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/string.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (variable-length string) */
+{% endif %}
+	if (!xdrgen_decode_string(xdr, (string *)ptr, {{ maxsize }}))
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/variable_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/variable_length_array.j2
new file mode 100644
index 000000000..2f943909c
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/variable_length_array.j2
@@ -0,0 +1,13 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (variable-length array) */
+{% endif %}
+	if (xdr_stream_decode_u32(xdr, &ptr->{{ name }}.count) < 0)
+		return false;
+{% if maxsize != "0" %}
+	if (ptr->{{ name }}.count > {{ maxsize }})
+		return false;
+{% endif %}
+	for (u32 i = 0; i < ptr->{{ name }}.count; i++)
+		if (!xdrgen_decode_{{ type }}(xdr, &ptr->{{ name }}.element[i]))
+			return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/variable_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/variable_length_opaque.j2
new file mode 100644
index 000000000..65698e20d
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/decoder/variable_length_opaque.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (variable-length opaque) */
+{% endif %}
+	if (!xdrgen_decode_opaque(xdr, &ptr->{{ name }}, {{ maxsize }}))
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/definition/basic.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/basic.j2
new file mode 100644
index 000000000..b3430895f
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/basic.j2
@@ -0,0 +1,5 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* (basic) */
+{% endif %}
+	{{ classifier }}{{ type }} {{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/definition/close.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/close.j2
new file mode 100644
index 000000000..9e62344a9
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/close.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/definition/fixed_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/fixed_length_array.j2
new file mode 100644
index 000000000..66be83682
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/fixed_length_array.j2
@@ -0,0 +1,5 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* (fixed-length array) */
+{% endif %}
+	{{ type }} {{ name }}[{{ size }}];
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/definition/fixed_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/fixed_length_opaque.j2
new file mode 100644
index 000000000..0daba19aa
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/fixed_length_opaque.j2
@@ -0,0 +1,5 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* (fixed-length opaque) */
+{% endif %}
+	u8 {{ name }}[{{ size }}];
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/definition/open.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/open.j2
new file mode 100644
index 000000000..07cbf5424
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/open.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* struct {{ name }} */
+{% endif %}
+struct {{ name }} {
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/definition/optional_data.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/optional_data.j2
new file mode 100644
index 000000000..a33341f45
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/optional_data.j2
@@ -0,0 +1,5 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* (optional data) */
+{% endif %}
+	{{ classifier }}{{ type }} *{{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/definition/string.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/string.j2
new file mode 100644
index 000000000..2de2feec7
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/string.j2
@@ -0,0 +1,5 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* (variable-length string) */
+{% endif %}
+	string {{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/definition/variable_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/variable_length_array.j2
new file mode 100644
index 000000000..5d767f9b3
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/variable_length_array.j2
@@ -0,0 +1,8 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* (variable-length array) */
+{% endif %}
+	struct {
+		u32 count;
+		{{ classifier }}{{ type }} *element;
+	} {{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/definition/variable_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/variable_length_opaque.j2
new file mode 100644
index 000000000..4d0cd84be
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/definition/variable_length_opaque.j2
@@ -0,0 +1,5 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* (variable-length opaque) */
+{% endif %}
+	opaque {{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/basic.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/basic.j2
new file mode 100644
index 000000000..a7d3695c5
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/basic.j2
@@ -0,0 +1,10 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (basic) */
+{% endif %}
+{% if type in pass_by_reference %}
+	if (!xdrgen_encode_{{ type }}(xdr, &value->{{ name }}))
+{% else %}
+	if (!xdrgen_encode_{{ type }}(xdr, value->{{ name }}))
+{% endif %}
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/close.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/close.j2
new file mode 100644
index 000000000..3dbd724d7
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/close.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+	return true;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/fixed_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/fixed_length_array.j2
new file mode 100644
index 000000000..b01833a2c
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/fixed_length_array.j2
@@ -0,0 +1,12 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (fixed-length array) */
+{% endif %}
+	for (u32 i = 0; i < {{ size }}; i++) {
+{% if type in pass_by_reference %}
+		if (xdrgen_encode_{{ type }}(xdr, &value->items[i]) < 0)
+{% else %}
+		if (xdrgen_encode_{{ type }}(xdr, value->items[i]) < 0)
+{% endif %}
+			return false;
+	}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/fixed_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/fixed_length_opaque.j2
new file mode 100644
index 000000000..07bc91919
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/fixed_length_opaque.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (fixed-length opaque) */
+{% endif %}
+	if (xdr_stream_encode_opaque_fixed(xdr, value->{{ name }}, {{ size }}) < 0)
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/open.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/open.j2
new file mode 100644
index 000000000..2286a3adf
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/open.j2
@@ -0,0 +1,12 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* struct {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const struct {{ name }} *value)
+{
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/optional_data.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/optional_data.j2
new file mode 100644
index 000000000..16fb3e09b
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/optional_data.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (optional data) */
+{% endif %}
+	if (!xdrgen_encode_{{ type }}(xdr, value->{{ name }}))
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/string.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/string.j2
new file mode 100644
index 000000000..7ddc2bf3e
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/string.j2
@@ -0,0 +1,10 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (variable-length string) */
+{% endif %}
+{% if maxsize != "0" %}
+	if (value->{{ name }}.len > {{ maxsize }})
+		return false;
+{% endif %}
+	if (xdr_stream_encode_opaque(xdr, value->{{ name }}.data, value->{{ name }}.len) < 0)
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/variable_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/variable_length_array.j2
new file mode 100644
index 000000000..b21476629
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/variable_length_array.j2
@@ -0,0 +1,17 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (variable-length array) */
+{% endif %}
+{% if maxsize != "0" %}
+	if (value->{{ name }}.count > {{ maxsize }})
+		return false;
+{% endif %}
+	if (xdr_stream_encode_u32(xdr, value->{{ name }}.count) != XDR_UNIT)
+		return false;
+	for (u32 i = 0; i < value->{{ name }}.count; i++)
+{% if type in pass_by_reference %}
+		if (!xdrgen_encode_{{ type }}(xdr, &value->{{ name }}.element[i]))
+{% else %}
+		if (!xdrgen_encode_{{ type }}(xdr, value->{{ name }}.element[i]))
+{% endif %}
+			return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/variable_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/variable_length_opaque.j2
new file mode 100644
index 000000000..5bf00070a
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/encoder/variable_length_opaque.j2
@@ -0,0 +1,10 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* member {{ name }} (variable-length opaque) */
+{% endif %}
+{% if maxsize != "0" %}
+	if (value->{{ name }}.len > {{ maxsize }})
+		return false;
+{% endif %}
+	if (xdr_stream_encode_opaque(xdr, value->{{ name }}.data, value->{{ name }}.len) < 0)
+		return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/struct/maxsize/struct.j2 b/tools/net/sunrpc/xdrgen/templates/C/struct/maxsize/struct.j2
new file mode 100644
index 000000000..9f3bfb47d
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/struct/maxsize/struct.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+#define {{ '{:<31}'.format(macro) }} \
+	({{ width }})
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/basic.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/basic.j2
new file mode 100644
index 000000000..455b10bd9
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/basic.j2
@@ -0,0 +1,8 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+bool xdrgen_decode_{{ name }}(struct xdr_stream *xdr, {{ name }} *ptr);
+{% if name in pass_by_reference %}
+bool xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const {{ name }} *value);
+{%- else -%}
+bool xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const {{ name }} value);
+{% endif %}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/fixed_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/fixed_length_array.j2
new file mode 100644
index 000000000..3fe3ddd9f
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/fixed_length_array.j2
@@ -0,0 +1,4 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+bool xdrgen_decode_{{ name }}(struct xdr_stream *xdr, {{ classifier }}{{ name }} *ptr);
+bool xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const {{ classifier }}{{ name }} value);
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/fixed_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/fixed_length_opaque.j2
new file mode 100644
index 000000000..3fe3ddd9f
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/fixed_length_opaque.j2
@@ -0,0 +1,4 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+bool xdrgen_decode_{{ name }}(struct xdr_stream *xdr, {{ classifier }}{{ name }} *ptr);
+bool xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const {{ classifier }}{{ name }} value);
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/string.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/string.j2
new file mode 100644
index 000000000..3fe3ddd9f
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/string.j2
@@ -0,0 +1,4 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+bool xdrgen_decode_{{ name }}(struct xdr_stream *xdr, {{ classifier }}{{ name }} *ptr);
+bool xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const {{ classifier }}{{ name }} value);
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/variable_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/variable_length_array.j2
new file mode 100644
index 000000000..3fe3ddd9f
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/variable_length_array.j2
@@ -0,0 +1,4 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+bool xdrgen_decode_{{ name }}(struct xdr_stream *xdr, {{ classifier }}{{ name }} *ptr);
+bool xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const {{ classifier }}{{ name }} value);
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/variable_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/variable_length_opaque.j2
new file mode 100644
index 000000000..3fe3ddd9f
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/declaration/variable_length_opaque.j2
@@ -0,0 +1,4 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+bool xdrgen_decode_{{ name }}(struct xdr_stream *xdr, {{ classifier }}{{ name }} *ptr);
+bool xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const {{ classifier }}{{ name }} value);
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/basic.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/basic.j2
new file mode 100644
index 000000000..b215e157d
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/basic.j2
@@ -0,0 +1,17 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_decode_{{ name }}(struct xdr_stream *xdr, {{ name }} *ptr)
+{
+{% if annotate %}
+	/* (basic) */
+{% endif %}
+	return xdrgen_decode_{{ type }}(xdr, ptr);
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/fixed_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/fixed_length_array.j2
new file mode 100644
index 000000000..c8953719e
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/fixed_length_array.j2
@@ -0,0 +1,25 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_decode_{{ name }}(struct xdr_stream *xdr, {{ classifier }}{{ name }} *ptr)
+{
+{% if annotate %}
+	/* (fixed-length array) */
+{% endif %}
+	for (u32 i = 0; i < {{ size }}; i++) {
+{%- if classifier == '' %}
+		if (xdrgen_decode_{{ type }}(xdr, ptr->items[i]) < 0)
+{% else %}
+		if (xdrgen_decode_{{ type }}(xdr, &ptr->items[i]) < 0)
+{% endif %}
+			return false;
+	}
+	return true;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/fixed_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/fixed_length_opaque.j2
new file mode 100644
index 000000000..c854fc8c7
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/fixed_length_opaque.j2
@@ -0,0 +1,17 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_decode_{{ name }}(struct xdr_stream *xdr, {{ classifier }}{{ name }} *ptr)
+{
+{% if annotate %}
+	/* (fixed-length opaque) */
+{% endif %}
+	return xdr_stream_decode_opaque_fixed(xdr, ptr, {{ size }}) == 0;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/string.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/string.j2
new file mode 100644
index 000000000..bcbc1758a
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/string.j2
@@ -0,0 +1,17 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_decode_{{ name }}(struct xdr_stream *xdr, {{ classifier }}{{ name }} *ptr)
+{
+{% if annotate %}
+	/* (variable-length string) */
+{% endif %}
+	return xdrgen_decode_string(xdr, ptr, {{ maxsize }});
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/variable_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/variable_length_array.j2
new file mode 100644
index 000000000..a59cc1f38
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/variable_length_array.j2
@@ -0,0 +1,26 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_decode_{{ name }}(struct xdr_stream *xdr, {{ classifier }}{{ name }} *ptr)
+{
+{% if annotate %}
+	/* (variable-length array) */
+{% endif %}
+	if (xdr_stream_decode_u32(xdr, &ptr->count) < 0)
+		return false;
+{% if maxsize != "0" %}
+	if (ptr->count > {{ maxsize }})
+		return false;
+{% endif %}
+	for (u32 i = 0; i < ptr->count; i++)
+		if (!xdrgen_decode_{{ type }}(xdr, &ptr->element[i]))
+			return false;
+	return true;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/variable_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/variable_length_opaque.j2
new file mode 100644
index 000000000..eb05f53e1
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/decoder/variable_length_opaque.j2
@@ -0,0 +1,17 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_decode_{{ name }}(struct xdr_stream *xdr, {{ classifier }}{{ name }} *ptr)
+{
+{% if annotate %}
+	/* (variable-length opaque) */
+{% endif %}
+	return xdrgen_decode_opaque(xdr, ptr, {{ maxsize }});
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/basic.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/basic.j2
new file mode 100644
index 000000000..1c5f28135
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/basic.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} (basic) */
+{% endif %}
+typedef {{ classifier }}{{ type }} {{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/fixed_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/fixed_length_array.j2
new file mode 100644
index 000000000..c3a67c952
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/fixed_length_array.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} (fixed-length array) */
+{% endif %}
+typedef {{ type }}{{ name }}[{{ size }}];
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/fixed_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/fixed_length_opaque.j2
new file mode 100644
index 000000000..8788b02fe
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/fixed_length_opaque.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} (fixed-length opaque) */
+{% endif %}
+typedef u8 {{ name }}[{{ size }}];
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/string.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/string.j2
new file mode 100644
index 000000000..c03c2df8e
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/string.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} (variable-length string) */
+{% endif %}
+typedef string {{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/variable_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/variable_length_array.j2
new file mode 100644
index 000000000..f03393760
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/variable_length_array.j2
@@ -0,0 +1,9 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} (variable-length array) */
+{% endif %}
+typedef struct {
+	u32 count;
+	{{ classifier }}{{ type }} *element;
+} {{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/variable_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/variable_length_opaque.j2
new file mode 100644
index 000000000..162f2610a
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/definition/variable_length_opaque.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} (variable-length opaque) */
+{% endif %}
+typedef opaque {{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/basic.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/basic.j2
new file mode 100644
index 000000000..0d21dd0b7
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/basic.j2
@@ -0,0 +1,21 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+{% if name in pass_by_reference %}
+xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const {{ classifier }}{{ name }} *value)
+{% else %}
+xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const {{ classifier }}{{ name }} value)
+{% endif %}
+{
+{% if annotate %}
+	/* (basic) */
+{% endif %}
+	return xdrgen_encode_{{ type }}(xdr, value);
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/fixed_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/fixed_length_array.j2
new file mode 100644
index 000000000..ec8cd6509
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/fixed_length_array.j2
@@ -0,0 +1,25 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const {{ classifier }}{{ name }} value)
+{
+{% if annotate %}
+	/* (fixed-length array) */
+{% endif %}
+	for (u32 i = 0; i < {{ size }}; i++) {
+{% if type in pass_by_reference %}
+		if (xdrgen_encode_{{ type }}(xdr, &value->items[i]) < 0)
+{% else %}
+		if (xdrgen_encode_{{ type }}(xdr, value->items[i]) < 0)
+{% endif %}
+			return false;
+	}
+	return true;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/fixed_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/fixed_length_opaque.j2
new file mode 100644
index 000000000..b53fa87e1
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/fixed_length_opaque.j2
@@ -0,0 +1,17 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const {{ classifier }}{{ name }} value)
+{
+{% if annotate %}
+	/* (fixed-length opaque) */
+{% endif %}
+	return xdr_stream_encode_opaque_fixed(xdr, value, {{ size }}) >= 0;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/string.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/string.j2
new file mode 100644
index 000000000..28b81f1d0
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/string.j2
@@ -0,0 +1,17 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const {{ classifier }}{{ name }} value)
+{
+{% if annotate %}
+	/* (variable-length string) */
+{% endif %}
+	return xdr_stream_encode_opaque(xdr, value.data, value.len) >= 0;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/variable_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/variable_length_array.j2
new file mode 100644
index 000000000..ff093c281
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/variable_length_array.j2
@@ -0,0 +1,30 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const {{ classifier }}{{ name }} value)
+{
+{% if annotate %}
+	/* (variable-length array) */
+{% endif %}
+{% if maxsize != "0" %}
+	if (unlikely(value.count > {{ maxsize }}))
+		return false;
+{% endif %}
+	if (xdr_stream_encode_u32(xdr, value.count) != XDR_UNIT)
+		return false;
+	for (u32 i = 0; i < value.count; i++)
+{% if type in pass_by_reference %}
+		if (!xdrgen_encode_{{ type }}(xdr, &value.element[i]))
+{% else %}
+		if (!xdrgen_encode_{{ type }}(xdr, value.element[i]))
+{% endif %}
+			return false;
+	return true;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/variable_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/variable_length_opaque.j2
new file mode 100644
index 000000000..2e89592fa
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/encoder/variable_length_opaque.j2
@@ -0,0 +1,17 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* typedef {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const {{ classifier }}{{ name }} value)
+{
+{% if annotate %}
+	/* (variable-length opaque) */
+{% endif %}
+	return xdr_stream_encode_opaque(xdr, value.data, value.len) >= 0;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/maxsize/basic.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/maxsize/basic.j2
new file mode 100644
index 000000000..9f3bfb47d
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/maxsize/basic.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+#define {{ '{:<31}'.format(macro) }} \
+	({{ width }})
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/maxsize/fixed_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/maxsize/fixed_length_opaque.j2
new file mode 100644
index 000000000..45c1d4c21
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/maxsize/fixed_length_opaque.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+#define {{ '{:<31}'.format(macro) }} ({{ width }})
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/maxsize/string.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/maxsize/string.j2
new file mode 100644
index 000000000..45c1d4c21
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/maxsize/string.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+#define {{ '{:<31}'.format(macro) }} ({{ width }})
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/maxsize/variable_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/maxsize/variable_length_array.j2
new file mode 100644
index 000000000..45c1d4c21
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/maxsize/variable_length_array.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+#define {{ '{:<31}'.format(macro) }} ({{ width }})
diff --git a/tools/net/sunrpc/xdrgen/templates/C/typedef/maxsize/variable_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/typedef/maxsize/variable_length_opaque.j2
new file mode 100644
index 000000000..45c1d4c21
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/typedef/maxsize/variable_length_opaque.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+#define {{ '{:<31}'.format(macro) }} ({{ width }})
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/declaration/close.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/declaration/close.j2
new file mode 100644
index 000000000..816291184
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/declaration/close.j2
@@ -0,0 +1,4 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+bool xdrgen_decode_{{ name }}(struct xdr_stream *xdr, struct {{ name }} *ptr);
+bool xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const struct {{ name }} *value);
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/decoder/basic.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/basic.j2
new file mode 100644
index 000000000..4d97cc539
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/basic.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+		/* member {{ name }} (basic) */
+{% endif %}
+		if (!xdrgen_decode_{{ type }}(xdr, &ptr->u.{{ name }}))
+			return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/decoder/bool_spec.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/bool_spec.j2
new file mode 100644
index 000000000..05ad491f7
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/bool_spec.j2
@@ -0,0 +1,7 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* discriminant {{ name }} */
+{% endif %}
+	if (!xdrgen_decode_{{ type }}(xdr, &ptr->{{ name }}))
+		return false;
+	if (ptr->{{ name }}) {
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/decoder/break.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/break.j2
new file mode 100644
index 000000000..b286d1407
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/break.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+		break;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/decoder/case_spec.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/case_spec.j2
new file mode 100644
index 000000000..5fa2163f0
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/case_spec.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+	case {{ case }}:
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/decoder/case_spec_be.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/case_spec_be.j2
new file mode 100644
index 000000000..917f3a1c4
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/case_spec_be.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+	case __constant_cpu_to_be32({{ case }}):
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/decoder/close.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/close.j2
new file mode 100644
index 000000000..39d8d6c50
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/close.j2
@@ -0,0 +1,4 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+	}
+	return true;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/decoder/default_spec.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/default_spec.j2
new file mode 100644
index 000000000..044a002d0
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/default_spec.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+	default:
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/decoder/open.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/open.j2
new file mode 100644
index 000000000..eb9941376
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/open.j2
@@ -0,0 +1,12 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* union {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_decode_{{ name }}(struct xdr_stream *xdr, struct {{ name }} *ptr)
+{
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/decoder/optional_data.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/optional_data.j2
new file mode 100644
index 000000000..e4476f5fd
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/optional_data.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+		/* member {{ name }} (optional data) */
+{% endif %}
+		if (!xdrgen_decode_{{ type }}(xdr, &ptr->u.{{ name }}))
+			return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/decoder/string.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/string.j2
new file mode 100644
index 000000000..83b6e5a14
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/string.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+		/* member {{ name }} (variable-length string) */
+{% endif %}
+		if (!xdrgen_decode_string(xdr, (struct string *)ptr->u.{{ name }}, {{ maxsize }}))
+			return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/decoder/switch_spec.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/switch_spec.j2
new file mode 100644
index 000000000..99b3067ef
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/switch_spec.j2
@@ -0,0 +1,7 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* discriminant {{ name }} */
+{% endif %}
+	if (!xdrgen_decode_{{ type }}(xdr, &ptr->{{ name }}))
+		return false;
+	switch (ptr->{{ name }}) {
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/decoder/variable_length_array.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/variable_length_array.j2
new file mode 100644
index 000000000..53dfaf9ce
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/variable_length_array.j2
@@ -0,0 +1,15 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+		/* member {{ name }} (variable-length array) */
+{% endif %}
+		if (xdr_stream_decode_u32(xdr, &count) < 0)
+			return false;
+{% if maxsize != "0" %}
+		if (count > {{ maxsize }})
+			return false;
+{% endif %}
+		for (u32 i = 0; i < count; i++) {
+			if (xdrgen_decode_{{ type }}(xdr, &ptr->{{ name }}.items[i]) < 0)
+				return false;
+		}
+		ptr->{{ name }}.len = count;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/decoder/variable_length_opaque.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/variable_length_opaque.j2
new file mode 100644
index 000000000..c9d88ed29
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/variable_length_opaque.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+		/* member {{ name }} (variable-length opaque) */
+{% endif %}
+		if (!xdrgen_decode_opaque(xdr, (struct opaque *)ptr->u.{{ name }}, {{ maxsize }}))
+			return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/decoder/void.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/void.j2
new file mode 100644
index 000000000..65205ce37
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/decoder/void.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+		if (!xdrgen_decode_void(xdr))
+			return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/definition/case_spec.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/definition/case_spec.j2
new file mode 100644
index 000000000..52f8d131b
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/definition/case_spec.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+		{{ classifier }}{{ type }} {{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/definition/close.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/definition/close.j2
new file mode 100644
index 000000000..19ee759d7
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/definition/close.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+	} u;
+};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/definition/default_spec.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/definition/default_spec.j2
new file mode 100644
index 000000000..52f8d131b
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/definition/default_spec.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+		{{ classifier }}{{ type }} {{ name }};
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/definition/open.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/definition/open.j2
new file mode 100644
index 000000000..20fcfd1fc
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/definition/open.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* union {{ name }} */
+{% endif %}
+struct {{ name }} {
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/definition/switch_spec.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/definition/switch_spec.j2
new file mode 100644
index 000000000..3e5527325
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/definition/switch_spec.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+	{{ classifier }}{{ type }} {{ name }};
+	union {
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/encoder/basic.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/basic.j2
new file mode 100644
index 000000000..6452d75c6
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/basic.j2
@@ -0,0 +1,10 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+		/* member {{ name }} (basic) */
+{% endif %}
+{% if type in pass_by_reference %}
+		if (!xdrgen_encode_{{ type }}(xdr, &ptr->u.{{ name }}))
+{% else %}
+		if (!xdrgen_encode_{{ type }}(xdr, ptr->u.{{ name }}))
+{% endif %}
+			return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/encoder/bool_spec.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/bool_spec.j2
new file mode 100644
index 000000000..e5135ed64
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/bool_spec.j2
@@ -0,0 +1,7 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* discriminant {{ name }} */
+{% endif %}
+	if (!xdrgen_encode_{{ type }}(xdr, ptr->{{ name }}))
+		return false;
+	if (ptr->{{ name }}) {
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/encoder/break.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/break.j2
new file mode 100644
index 000000000..b286d1407
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/break.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+		break;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/encoder/case_spec.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/case_spec.j2
new file mode 100644
index 000000000..5fa2163f0
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/case_spec.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+	case {{ case }}:
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/encoder/case_spec_be.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/case_spec_be.j2
new file mode 100644
index 000000000..917f3a1c4
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/case_spec_be.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+	case __constant_cpu_to_be32({{ case }}):
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/encoder/close.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/close.j2
new file mode 100644
index 000000000..39d8d6c50
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/close.j2
@@ -0,0 +1,4 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+	}
+	return true;
+}
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/encoder/default_spec.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/default_spec.j2
new file mode 100644
index 000000000..044a002d0
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/default_spec.j2
@@ -0,0 +1,2 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+	default:
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/encoder/open.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/open.j2
new file mode 100644
index 000000000..e5a206df1
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/open.j2
@@ -0,0 +1,12 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+
+{% if annotate %}
+/* union {{ name }} */
+{% endif %}
+{% if name in public_apis %}
+bool
+{% else %}
+static bool __maybe_unused
+{% endif %}
+xdrgen_encode_{{ name }}(struct xdr_stream *xdr, const struct {{ name }} *ptr)
+{
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/encoder/string.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/string.j2
new file mode 100644
index 000000000..2f035a64f
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/string.j2
@@ -0,0 +1,6 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+		/* member {{ name }} (variable-length string) */
+{% endif %}
+		if (!xdrgen_encode_string(xdr, ptr->u.{{ name }}, {{ maxsize }}))
+			return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/encoder/switch_spec.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/switch_spec.j2
new file mode 100644
index 000000000..c8c3ecbe0
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/switch_spec.j2
@@ -0,0 +1,7 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+{% if annotate %}
+	/* discriminant {{ name }} */
+{% endif %}
+	if (!xdrgen_encode_{{ type }}(xdr, ptr->{{ name }}))
+		return false;
+	switch (ptr->{{ name }}) {
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/encoder/void.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/void.j2
new file mode 100644
index 000000000..84e7c2127
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/encoder/void.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+		if (!xdrgen_encode_void(xdr))
+			return false;
diff --git a/tools/net/sunrpc/xdrgen/templates/C/union/maxsize/union.j2 b/tools/net/sunrpc/xdrgen/templates/C/union/maxsize/union.j2
new file mode 100644
index 000000000..9f3bfb47d
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/templates/C/union/maxsize/union.j2
@@ -0,0 +1,3 @@
+{# SPDX-License-Identifier: GPL-2.0 #}
+#define {{ '{:<31}'.format(macro) }} \
+	({{ width }})
diff --git a/tools/net/sunrpc/xdrgen/tests/bad-procedure-number-negative.x b/tools/net/sunrpc/xdrgen/tests/bad-procedure-number-negative.x
new file mode 100644
index 000000000..33ed272c3
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/tests/bad-procedure-number-negative.x
@@ -0,0 +1,20 @@
+/*
+ * NEGATIVE TEST CASE -- xdrgen must REJECT this specification.
+ *
+ * RFC 5531 assigns only unsigned constants to program, version, and
+ * procedure numbers (Section 12.3). This spec gives a procedure a
+ * negative number, which the front end must reject.
+ *
+ * Expected diagnostic:
+ *   negative procedure number -5 in version 'BADVERS'
+ *
+ * The tests directory has no automated runner; exercise by hand:
+ *   ./xdrgen definitions tests/bad-procedure-number-negative.x   (must fail)
+ */
+
+program BADPROG {
+	version BADVERS {
+		void BADPROC_NULL(void) = 0;
+		void BADPROC_FOO(void)  = -5;
+	} = 1;
+} = 100000;
diff --git a/tools/net/sunrpc/xdrgen/tests/bad-procedure-number-too-large.x b/tools/net/sunrpc/xdrgen/tests/bad-procedure-number-too-large.x
new file mode 100644
index 000000000..521581c57
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/tests/bad-procedure-number-too-large.x
@@ -0,0 +1,20 @@
+/*
+ * NEGATIVE TEST CASE -- xdrgen must REJECT this specification.
+ *
+ * RFC 5531 encodes program, version, and procedure numbers as unsigned
+ * 32-bit integers (Section 9). This spec gives a procedure a number one
+ * past the 32-bit maximum, which the front end must reject.
+ *
+ * Expected diagnostic:
+ *   procedure number 4294967296 in version 'BADVERS' exceeds 4294967295
+ *
+ * The tests directory has no automated runner; exercise by hand:
+ *   ./xdrgen definitions tests/bad-procedure-number-too-large.x   (must fail)
+ */
+
+program BADPROG {
+	version BADVERS {
+		void BADPROC_NULL(void) = 0;
+		void BADPROC_FOO(void)  = 4294967296;
+	} = 1;
+} = 100000;
diff --git a/tools/net/sunrpc/xdrgen/tests/bad-program-number-negative.x b/tools/net/sunrpc/xdrgen/tests/bad-program-number-negative.x
new file mode 100644
index 000000000..f7b71ee07
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/tests/bad-program-number-negative.x
@@ -0,0 +1,19 @@
+/*
+ * NEGATIVE TEST CASE -- xdrgen must REJECT this specification.
+ *
+ * RFC 5531 assigns only unsigned constants to program, version, and
+ * procedure numbers (Section 12.3). This spec gives the program a
+ * negative number, which the front end must reject.
+ *
+ * Expected diagnostic:
+ *   negative program number -100000 in program 'BADPROG'
+ *
+ * The tests directory has no automated runner; exercise by hand:
+ *   ./xdrgen definitions tests/bad-program-number-negative.x   (must fail)
+ */
+
+program BADPROG {
+	version BADVERS {
+		void BADPROC_NULL(void) = 0;
+	} = 1;
+} = -100000;
diff --git a/tools/net/sunrpc/xdrgen/tests/bad-program-number-too-large.x b/tools/net/sunrpc/xdrgen/tests/bad-program-number-too-large.x
new file mode 100644
index 000000000..c761584e7
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/tests/bad-program-number-too-large.x
@@ -0,0 +1,19 @@
+/*
+ * NEGATIVE TEST CASE -- xdrgen must REJECT this specification.
+ *
+ * RFC 5531 encodes program, version, and procedure numbers as unsigned
+ * 32-bit integers (Section 9). This spec gives the program a number one
+ * past the 32-bit maximum, which the front end must reject.
+ *
+ * Expected diagnostic:
+ *   program number 4294967296 in program 'BADPROG' exceeds 4294967295
+ *
+ * The tests directory has no automated runner; exercise by hand:
+ *   ./xdrgen definitions tests/bad-program-number-too-large.x   (must fail)
+ */
+
+program BADPROG {
+	version BADVERS {
+		void BADPROC_NULL(void) = 0;
+	} = 1;
+} = 4294967296;
diff --git a/tools/net/sunrpc/xdrgen/tests/bad-version-number-negative.x b/tools/net/sunrpc/xdrgen/tests/bad-version-number-negative.x
new file mode 100644
index 000000000..dd9c77343
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/tests/bad-version-number-negative.x
@@ -0,0 +1,19 @@
+/*
+ * NEGATIVE TEST CASE -- xdrgen must REJECT this specification.
+ *
+ * RFC 5531 assigns only unsigned constants to program, version, and
+ * procedure numbers (Section 12.3). This spec gives the version a
+ * negative number, which the front end must reject.
+ *
+ * Expected diagnostic:
+ *   negative version number -1 in program 'BADPROG'
+ *
+ * The tests directory has no automated runner; exercise by hand:
+ *   ./xdrgen definitions tests/bad-version-number-negative.x   (must fail)
+ */
+
+program BADPROG {
+	version BADVERS {
+		void BADPROC_NULL(void) = 0;
+	} = -1;
+} = 100000;
diff --git a/tools/net/sunrpc/xdrgen/tests/bad-version-number-too-large.x b/tools/net/sunrpc/xdrgen/tests/bad-version-number-too-large.x
new file mode 100644
index 000000000..dd44f6eed
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/tests/bad-version-number-too-large.x
@@ -0,0 +1,19 @@
+/*
+ * NEGATIVE TEST CASE -- xdrgen must REJECT this specification.
+ *
+ * RFC 5531 encodes program, version, and procedure numbers as unsigned
+ * 32-bit integers (Section 9). This spec gives the version a number one
+ * past the 32-bit maximum, which the front end must reject.
+ *
+ * Expected diagnostic:
+ *   version number 4294967296 in program 'BADPROG' exceeds 4294967295
+ *
+ * The tests directory has no automated runner; exercise by hand:
+ *   ./xdrgen definitions tests/bad-version-number-too-large.x   (must fail)
+ */
+
+program BADPROG {
+	version BADVERS {
+		void BADPROC_NULL(void) = 0;
+	} = 4294967296;
+} = 100000;
diff --git a/tools/net/sunrpc/xdrgen/tests/test.x b/tools/net/sunrpc/xdrgen/tests/test.x
new file mode 100644
index 000000000..90c8587f6
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/tests/test.x
@@ -0,0 +1,36 @@
+/* Sample XDR specification from RFC 1832 Section 5.5 */
+
+const MAXUSERNAME = 32;     /* max length of a user name */
+const MAXFILELEN = 65535;   /* max length of a file      */
+const MAXNAMELEN = 255;     /* max length of a file name */
+
+/*
+ * Types of files:
+ */
+enum filekind {
+   TEXT = 0,       /* ascii data */
+   DATA = 1,       /* raw data   */
+   EXEC = 2        /* executable */
+};
+
+/*
+ * File information, per kind of file:
+ */
+union filetype switch (filekind kind) {
+case TEXT:
+   void;                           /* no extra information */
+case DATA:
+   string creator<MAXNAMELEN>;     /* data creator         */
+case EXEC:
+   string interpretor<MAXNAMELEN>; /* program interpretor  */
+};
+
+/*
+ * A complete file:
+ */
+struct file {
+   string filename<MAXNAMELEN>; /* name of file    */
+   filetype type;               /* info about file */
+   string owner<MAXUSERNAME>;   /* owner of file   */
+   opaque data<MAXFILELEN>;     /* file data       */
+};
diff --git a/tools/net/sunrpc/xdrgen/xdr_ast.py b/tools/net/sunrpc/xdrgen/xdr_ast.py
new file mode 100644
index 000000000..9dab8bc54
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/xdr_ast.py
@@ -0,0 +1,1004 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Define and implement the Abstract Syntax Tree for the XDR language."""
+
+import sys
+from typing import List
+from dataclasses import dataclass, KW_ONLY
+
+from lark import ast_utils, Transformer
+from lark.tree import Meta
+
+this_module = sys.modules[__name__]
+
+big_endian = []
+excluded_apis = []
+header_name = "none"
+public_apis = []
+structs = set()
+pass_by_reference = set()
+
+constants = {}
+
+
+def xdr_quadlen(val: str) -> int:
+    """Return integer XDR width of an XDR type"""
+    if val in constants:
+        octets = constants[val]
+    else:
+        octets = int(val)
+    return int((octets + 3) / 4)
+
+
+symbolic_widths = {
+    "void": ["XDR_void"],
+    "bool": ["XDR_bool"],
+    "short": ["XDR_short"],
+    "unsigned_short": ["XDR_unsigned_short"],
+    "int": ["XDR_int"],
+    "unsigned_int": ["XDR_unsigned_int"],
+    "long": ["XDR_long"],
+    "unsigned_long": ["XDR_unsigned_long"],
+    "hyper": ["XDR_hyper"],
+    "unsigned_hyper": ["XDR_unsigned_hyper"],
+}
+
+# Numeric XDR widths are tracked in a dictionary that is keyed
+# by type_name because sometimes a caller has nothing more than
+# the type_name to use to figure out the numeric width.
+max_widths = {
+    "void": 0,
+    "bool": 1,
+    "short": 1,
+    "unsigned_short": 1,
+    "int": 1,
+    "unsigned_int": 1,
+    "long": 1,
+    "unsigned_long": 1,
+    "hyper": 2,
+    "unsigned_hyper": 2,
+}
+
+
+@dataclass
+class _XdrAst(ast_utils.Ast):
+    """Base class for the XDR abstract syntax tree"""
+
+    # Source position of the construct's declared identifier, when
+    # the transformer records one, so semantic diagnostics can point
+    # at the exact declaration. The KW_ONLY marker makes the fields
+    # keyword-only, so they never disturb the positional child
+    # ordering lark uses to build each node; 0 means the position was
+    # not recorded.
+    _: KW_ONLY
+    line: int = 0
+    column: int = 0
+
+
+@dataclass
+class _XdrIdentifier(_XdrAst):
+    """Corresponds to 'identifier' in the XDR language grammar"""
+
+    symbol: str
+
+
+@dataclass
+class _XdrValue(_XdrAst):
+    """Corresponds to 'value' in the XDR language grammar"""
+
+    value: str
+
+
+@dataclass
+class _XdrConstantValue(_XdrAst):
+    """Corresponds to 'constant' in the XDR language grammar"""
+
+    value: int
+
+
+@dataclass
+class _XdrTypeSpecifier(_XdrAst):
+    """Corresponds to 'type_specifier' in the XDR language grammar"""
+
+    type_name: str
+    c_classifier: str = ""
+
+
+@dataclass
+class _XdrDefinedType(_XdrTypeSpecifier):
+    """Corresponds to a type defined by the input specification"""
+
+    def symbolic_width(self) -> List:
+        """Return list containing XDR width of type's components"""
+        return [get_header_name().upper() + "_" + self.type_name + "_sz"]
+
+    def __post_init__(self):
+        if self.type_name in structs:
+            self.c_classifier = "struct "
+        symbolic_widths[self.type_name] = self.symbolic_width()
+
+
+@dataclass
+class _XdrBuiltInType(_XdrTypeSpecifier):
+    """Corresponds to a built-in XDR type"""
+
+    def symbolic_width(self) -> List:
+        """Return list containing XDR width of type's components"""
+        return symbolic_widths[self.type_name]
+
+
+@dataclass
+class _XdrDeclaration(_XdrAst):
+    """Base class of XDR type declarations"""
+
+
+@dataclass
+class _XdrFixedLengthOpaque(_XdrDeclaration):
+    """A fixed-length opaque declaration"""
+
+    name: str
+    size: str
+    template: str = "fixed_length_opaque"
+
+    def max_width(self) -> int:
+        """Return width of type in XDR_UNITS"""
+        return xdr_quadlen(self.size)
+
+    def symbolic_width(self) -> List:
+        """Return list containing XDR width of type's components"""
+        return ["XDR_QUADLEN(" + self.size + ")"]
+
+    def __post_init__(self):
+        max_widths[self.name] = self.max_width()
+        symbolic_widths[self.name] = self.symbolic_width()
+
+
+@dataclass
+class _XdrVariableLengthOpaque(_XdrDeclaration):
+    """A variable-length opaque declaration"""
+
+    name: str
+    maxsize: str
+    template: str = "variable_length_opaque"
+
+    def max_width(self) -> int:
+        """Return width of type in XDR_UNITS"""
+        return 1 + xdr_quadlen(self.maxsize)
+
+    def symbolic_width(self) -> List:
+        """Return list containing XDR width of type's components"""
+        widths = ["XDR_unsigned_int"]
+        if self.maxsize != "0":
+            widths.append("XDR_QUADLEN(" + self.maxsize + ")")
+        return widths
+
+    def __post_init__(self):
+        max_widths[self.name] = self.max_width()
+        symbolic_widths[self.name] = self.symbolic_width()
+
+
+@dataclass
+class _XdrString(_XdrDeclaration):
+    """A (NUL-terminated) variable-length string declaration"""
+
+    name: str
+    maxsize: str
+    template: str = "string"
+
+    def max_width(self) -> int:
+        """Return width of type in XDR_UNITS"""
+        return 1 + xdr_quadlen(self.maxsize)
+
+    def symbolic_width(self) -> List:
+        """Return list containing XDR width of type's components"""
+        widths = ["XDR_unsigned_int"]
+        if self.maxsize != "0":
+            widths.append("XDR_QUADLEN(" + self.maxsize + ")")
+        return widths
+
+    def __post_init__(self):
+        max_widths[self.name] = self.max_width()
+        symbolic_widths[self.name] = self.symbolic_width()
+
+
+@dataclass
+class _XdrFixedLengthArray(_XdrDeclaration):
+    """A fixed-length array declaration"""
+
+    name: str
+    spec: _XdrTypeSpecifier
+    size: str
+    template: str = "fixed_length_array"
+
+    def max_width(self) -> int:
+        """Return width of type in XDR_UNITS"""
+        return xdr_quadlen(self.size) * max_widths[self.spec.type_name]
+
+    def symbolic_width(self) -> List:
+        """Return list containing XDR width of type's components"""
+        item_width = " + ".join(symbolic_widths[self.spec.type_name])
+        return ["(" + self.size + " * (" + item_width + "))"]
+
+    def __post_init__(self):
+        max_widths[self.name] = self.max_width()
+        symbolic_widths[self.name] = self.symbolic_width()
+
+
+@dataclass
+class _XdrVariableLengthArray(_XdrDeclaration):
+    """A variable-length array declaration"""
+
+    name: str
+    spec: _XdrTypeSpecifier
+    maxsize: str
+    template: str = "variable_length_array"
+
+    def max_width(self) -> int:
+        """Return width of type in XDR_UNITS"""
+        return 1 + (xdr_quadlen(self.maxsize) * max_widths[self.spec.type_name])
+
+    def symbolic_width(self) -> List:
+        """Return list containing XDR width of type's components"""
+        widths = ["XDR_unsigned_int"]
+        if self.maxsize != "0":
+            item_width = " + ".join(symbolic_widths[self.spec.type_name])
+            widths.append("(" + self.maxsize + " * (" + item_width + "))")
+        return widths
+
+    def __post_init__(self):
+        max_widths[self.name] = self.max_width()
+        symbolic_widths[self.name] = self.symbolic_width()
+
+
+@dataclass
+class _XdrOptionalData(_XdrDeclaration):
+    """An 'optional_data' declaration"""
+
+    name: str
+    spec: _XdrTypeSpecifier
+    template: str = "optional_data"
+
+    def max_width(self) -> int:
+        """Return width of type in XDR_UNITS"""
+        return 1
+
+    def symbolic_width(self) -> List:
+        """Return list containing XDR width of type's components"""
+        return ["XDR_bool"]
+
+    def __post_init__(self):
+        structs.add(self.name)
+        pass_by_reference.add(self.name)
+        max_widths[self.name] = self.max_width()
+        symbolic_widths[self.name] = self.symbolic_width()
+
+
+@dataclass
+class _XdrBasic(_XdrDeclaration):
+    """A 'basic' declaration"""
+
+    name: str
+    spec: _XdrTypeSpecifier
+    template: str = "basic"
+
+    def max_width(self) -> int:
+        """Return width of type in XDR_UNITS"""
+        return max_widths[self.spec.type_name]
+
+    def symbolic_width(self) -> List:
+        """Return list containing XDR width of type's components"""
+        return symbolic_widths[self.spec.type_name]
+
+    def __post_init__(self):
+        max_widths[self.name] = self.max_width()
+        symbolic_widths[self.name] = self.symbolic_width()
+
+
+@dataclass
+class _XdrVoid(_XdrDeclaration):
+    """A void declaration"""
+
+    name: str = "void"
+    template: str = "void"
+
+    def max_width(self) -> int:
+        """Return width of type in XDR_UNITS"""
+        return 0
+
+    def symbolic_width(self) -> List:
+        """Return list containing XDR width of type's components"""
+        return []
+
+
+@dataclass
+class _XdrConstant(_XdrAst):
+    """Corresponds to 'constant_def' in the grammar"""
+
+    name: str
+    value: str
+
+    def __post_init__(self):
+        if self.value not in constants:
+            constants[self.name] = int(self.value, 0)
+
+
+@dataclass
+class _XdrEnumerator(_XdrAst):
+    """An 'identifier = value' enumerator"""
+
+    name: str
+    value: str
+
+    def __post_init__(self):
+        if self.value not in constants:
+            constants[self.name] = int(self.value, 0)
+
+
+@dataclass
+class _XdrEnum(_XdrAst):
+    """An XDR enum definition"""
+
+    name: str
+    enumerators: List[_XdrEnumerator]
+
+    def max_width(self) -> int:
+        """Return width of type in XDR_UNITS"""
+        return 1
+
+    def symbolic_width(self) -> List:
+        """Return list containing XDR width of type's components"""
+        return ["XDR_int"]
+
+    def __post_init__(self):
+        max_widths[self.name] = self.max_width()
+        symbolic_widths[self.name] = self.symbolic_width()
+
+
+@dataclass
+class _XdrStruct(_XdrAst):
+    """An XDR struct definition"""
+
+    name: str
+    fields: List[_XdrDeclaration]
+
+    def max_width(self) -> int:
+        """Return width of type in XDR_UNITS"""
+        width = 0
+        for field in self.fields:
+            width += field.max_width()
+        return width
+
+    def symbolic_width(self) -> List:
+        """Return list containing XDR width of type's components"""
+        widths = []
+        for field in self.fields:
+            widths += field.symbolic_width()
+        return widths
+
+    def __post_init__(self):
+        structs.add(self.name)
+        pass_by_reference.add(self.name)
+        max_widths[self.name] = self.max_width()
+        symbolic_widths[self.name] = self.symbolic_width()
+
+
+@dataclass
+class _XdrPointer(_XdrAst):
+    """An XDR pointer definition"""
+
+    name: str
+    fields: List[_XdrDeclaration]
+
+    def max_width(self) -> int:
+        """Return width of type in XDR_UNITS"""
+        width = 1
+        for field in self.fields[0:-1]:
+            width += field.max_width()
+        return width
+
+    def symbolic_width(self) -> List:
+        """Return list containing XDR width of type's components"""
+        widths = []
+        widths += ["XDR_bool"]
+        for field in self.fields[0:-1]:
+            widths += field.symbolic_width()
+        return widths
+
+    def __post_init__(self):
+        structs.add(self.name)
+        pass_by_reference.add(self.name)
+        max_widths[self.name] = self.max_width()
+        symbolic_widths[self.name] = self.symbolic_width()
+
+
+@dataclass
+class _XdrTypedef(_XdrAst):
+    """An XDR typedef"""
+
+    declaration: _XdrDeclaration
+
+    def max_width(self) -> int:
+        """Return width of type in XDR_UNITS"""
+        return self.declaration.max_width()
+
+    def symbolic_width(self) -> List:
+        """Return list containing XDR width of type's components"""
+        return self.declaration.symbolic_width()
+
+    def __post_init__(self):
+        if isinstance(self.declaration, _XdrBasic):
+            new_type = self.declaration
+            if isinstance(new_type.spec, _XdrDefinedType):
+                if new_type.spec.type_name in pass_by_reference:
+                    pass_by_reference.add(new_type.name)
+                max_widths[new_type.name] = self.max_width()
+                symbolic_widths[new_type.name] = self.symbolic_width()
+
+
+@dataclass
+class _XdrCaseSpec(_XdrAst):
+    """One case in an XDR union"""
+
+    values: List[str]
+    arm: _XdrDeclaration
+    template: str = "case_spec"
+
+
+@dataclass
+class _XdrDefaultSpec(_XdrAst):
+    """Default case in an XDR union"""
+
+    arm: _XdrDeclaration
+    template: str = "default_spec"
+
+
+@dataclass
+class _XdrUnion(_XdrAst):
+    """An XDR union"""
+
+    name: str
+    discriminant: _XdrDeclaration
+    cases: List[_XdrCaseSpec]
+    default: _XdrDeclaration
+
+    def max_width(self) -> int:
+        """Return width of type in XDR_UNITS"""
+        max_width = 0
+        for case in self.cases:
+            if case.arm.max_width() > max_width:
+                max_width = case.arm.max_width()
+        if self.default:
+            if self.default.arm.max_width() > max_width:
+                max_width = self.default.arm.max_width()
+        return 1 + max_width
+
+    def symbolic_width(self) -> List:
+        """Return list containing XDR width of type's components"""
+        max_width = 0
+        for case in self.cases:
+            if case.arm.max_width() > max_width:
+                max_width = case.arm.max_width()
+                width = case.arm.symbolic_width()
+        if self.default:
+            if self.default.arm.max_width() > max_width:
+                max_width = self.default.arm.max_width()
+                width = self.default.arm.symbolic_width()
+        return symbolic_widths[self.discriminant.name] + width
+
+    def __post_init__(self):
+        structs.add(self.name)
+        pass_by_reference.add(self.name)
+        max_widths[self.name] = self.max_width()
+        symbolic_widths[self.name] = self.symbolic_width()
+
+
+@dataclass
+class _RpcProcedure(_XdrAst):
+    """RPC procedure definition"""
+
+    name: str
+    number: int
+    argument: _XdrTypeSpecifier
+    result: _XdrTypeSpecifier
+
+
+@dataclass
+class _RpcVersion(_XdrAst):
+    """RPC version definition"""
+
+    name: str
+    number: int
+    procedures: List[_RpcProcedure]
+
+
+@dataclass
+class _RpcProgram(_XdrAst):
+    """RPC program definition"""
+
+    name: str
+    number: int
+    versions: List[_RpcVersion]
+
+
+@dataclass
+class _Pragma(_XdrAst):
+    """Empty class for pragma directives"""
+
+
+@dataclass
+class _XdrPassthru(_XdrAst):
+    """Passthrough line to emit verbatim in output"""
+
+    content: str
+
+
+@dataclass
+class Definition(_XdrAst, ast_utils.WithMeta):
+    """Corresponds to 'definition' in the grammar"""
+
+    meta: Meta
+    value: _XdrAst
+
+
+@dataclass
+class Specification(_XdrAst, ast_utils.AsList):
+    """Corresponds to 'specification' in the grammar"""
+
+    definitions: List[Definition]
+
+
+class ParseToAst(Transformer):
+    """Functions that transform productions into AST nodes"""
+
+    def identifier(self, children):
+        """Instantiate one _XdrIdentifier object"""
+        token = children[0]
+        return _XdrIdentifier(token.value, line=token.line, column=token.column)
+
+    def value(self, children):
+        """Instantiate one _XdrValue object"""
+        if isinstance(children[0], _XdrIdentifier):
+            return _XdrValue(children[0].symbol)
+        return _XdrValue(children[0].children[0].value)
+
+    def constant(self, children):
+        """Instantiate one _XdrConstantValue object"""
+        match children[0].data:
+            case "decimal_constant":
+                value = int(children[0].children[0].value, base=10)
+            case "hexadecimal_constant":
+                value = int(children[0].children[0].value, base=16)
+            case "octal_constant":
+                value = int(children[0].children[0].value, base=8)
+        return _XdrConstantValue(value)
+
+    def type_specifier(self, children):
+        """Instantiate one _XdrTypeSpecifier object"""
+        if isinstance(children[0], _XdrIdentifier):
+            name = children[0].symbol
+            return _XdrDefinedType(type_name=name)
+
+        name = children[0].data.value
+        return _XdrBuiltInType(type_name=name)
+
+    def constant_def(self, children):
+        """Instantiate one _XdrConstant object"""
+        ident = children[0]
+        value = children[1].value
+        return _XdrConstant(ident.symbol, value, line=ident.line, column=ident.column)
+
+    def enum(self, children):
+        """Instantiate one _XdrEnum object"""
+        name_ident = children[0]
+
+        i = 0
+        enumerators = []
+        body = children[1]
+        while i < len(body.children):
+            ident = body.children[i]
+            value = body.children[i + 1].value
+            enumerators.append(
+                _XdrEnumerator(
+                    ident.symbol, value, line=ident.line, column=ident.column
+                )
+            )
+            i = i + 2
+
+        return _XdrEnum(
+            name_ident.symbol,
+            enumerators,
+            line=name_ident.line,
+            column=name_ident.column,
+        )
+
+    def fixed_length_opaque(self, children):
+        """Instantiate one _XdrFixedLengthOpaque declaration object"""
+        ident = children[0]
+        size = children[1].value
+
+        return _XdrFixedLengthOpaque(
+            ident.symbol, size, line=ident.line, column=ident.column
+        )
+
+    def variable_length_opaque(self, children):
+        """Instantiate one _XdrVariableLengthOpaque declaration object"""
+        ident = children[0]
+        if children[1] is not None:
+            maxsize = children[1].value
+        else:
+            maxsize = "0"
+
+        return _XdrVariableLengthOpaque(
+            ident.symbol, maxsize, line=ident.line, column=ident.column
+        )
+
+    def string(self, children):
+        """Instantiate one _XdrString declaration object"""
+        ident = children[0]
+        if children[1] is not None:
+            maxsize = children[1].value
+        else:
+            maxsize = "0"
+
+        return _XdrString(ident.symbol, maxsize, line=ident.line, column=ident.column)
+
+    def fixed_length_array(self, children):
+        """Instantiate one _XdrFixedLengthArray declaration object"""
+        spec = children[0]
+        ident = children[1]
+        size = children[2].value
+
+        return _XdrFixedLengthArray(
+            ident.symbol, spec, size, line=ident.line, column=ident.column
+        )
+
+    def variable_length_array(self, children):
+        """Instantiate one _XdrVariableLengthArray declaration object"""
+        spec = children[0]
+        ident = children[1]
+        if children[2] is not None:
+            maxsize = children[2].value
+        else:
+            maxsize = "0"
+
+        return _XdrVariableLengthArray(
+            ident.symbol, spec, maxsize, line=ident.line, column=ident.column
+        )
+
+    def optional_data(self, children):
+        """Instantiate one _XdrOptionalData declaration object"""
+        spec = children[0]
+        ident = children[1]
+
+        return _XdrOptionalData(
+            ident.symbol, spec, line=ident.line, column=ident.column
+        )
+
+    def basic(self, children):
+        """Instantiate one _XdrBasic object"""
+        spec = children[0]
+        ident = children[1]
+
+        return _XdrBasic(ident.symbol, spec, line=ident.line, column=ident.column)
+
+    def void(self, children):
+        """Instantiate one _XdrVoid declaration object"""
+
+        return _XdrVoid()
+
+    def struct(self, children):
+        """Instantiate one _XdrStruct object"""
+        ident = children[0]
+        name = ident.symbol
+        fields = children[1].children
+        pos = {"line": ident.line, "column": ident.column}
+
+        last_field = fields[-1]
+        if (
+            isinstance(last_field, _XdrOptionalData)
+            and name == last_field.spec.type_name
+        ):
+            return _XdrPointer(name, fields, **pos)
+
+        return _XdrStruct(name, fields, **pos)
+
+    def typedef(self, children):
+        """Instantiate one _XdrTypedef object"""
+        new_type = children[0]
+
+        return _XdrTypedef(new_type)
+
+    def case_spec(self, children):
+        """Instantiate one _XdrCaseSpec object"""
+        values = []
+        for item in children[0:-1]:
+            values.append(item.value)
+        arm = children[-1]
+
+        return _XdrCaseSpec(values, arm)
+
+    def default_spec(self, children):
+        """Instantiate one _XdrDefaultSpec object"""
+        arm = children[0]
+
+        return _XdrDefaultSpec(arm)
+
+    def union(self, children):
+        """Instantiate one _XdrUnion object"""
+        ident = children[0]
+
+        body = children[1]
+        discriminant = body.children[0].children[0]
+        cases = body.children[1:-1]
+        default = body.children[-1]
+
+        return _XdrUnion(
+            ident.symbol,
+            discriminant,
+            cases,
+            default,
+            line=ident.line,
+            column=ident.column,
+        )
+
+    def procedure_def(self, children):
+        """Instantiate one _RpcProcedure object"""
+        result = children[0]
+        ident = children[1]
+        argument = children[2]
+        number = children[3].value
+
+        return _RpcProcedure(
+            ident.symbol,
+            number,
+            argument,
+            result,
+            line=ident.line,
+            column=ident.column,
+        )
+
+    def version_def(self, children):
+        """Instantiate one _RpcVersion object"""
+        ident = children[0]
+        number = children[-1].value
+        procedures = children[1:-1]
+
+        return _RpcVersion(
+            ident.symbol, number, procedures, line=ident.line, column=ident.column
+        )
+
+    def program_def(self, children):
+        """Instantiate one _RpcProgram object"""
+        ident = children[0]
+        number = children[-1].value
+        versions = children[1:-1]
+
+        return _RpcProgram(
+            ident.symbol, number, versions, line=ident.line, column=ident.column
+        )
+
+    def pragma_def(self, children):
+        """Instantiate one _Pragma object"""
+        directive = children[0].children[0].data
+        match directive:
+            case "big_endian_directive":
+                big_endian.append(children[1].symbol)
+            case "exclude_directive":
+                excluded_apis.append(children[1].symbol)
+            case "header_directive":
+                global header_name
+                header_name = children[1].symbol
+            case "public_directive":
+                public_apis.append(children[1].symbol)
+            case _:
+                raise NotImplementedError("Directive not supported")
+        return _Pragma()
+
+    def passthru_def(self, children):
+        """Instantiate one _XdrPassthru object"""
+        token = children[0]
+        content = token.value[1:]
+        return _XdrPassthru(content)
+
+
+transformer = ast_utils.create_transformer(this_module, ParseToAst())
+
+
+def _merge_consecutive_passthru(definitions: List[Definition]) -> List[Definition]:
+    """Merge consecutive passthru definitions into single nodes"""
+    result = []
+    i = 0
+    while i < len(definitions):
+        if isinstance(definitions[i].value, _XdrPassthru):
+            lines = [definitions[i].value.content]
+            meta = definitions[i].meta
+            j = i + 1
+            while j < len(definitions) and isinstance(
+                definitions[j].value, _XdrPassthru
+            ):
+                lines.append(definitions[j].value.content)
+                j += 1
+            merged = _XdrPassthru("\n".join(lines))
+            result.append(Definition(meta, merged))
+            i = j
+        else:
+            result.append(definitions[i])
+            i += 1
+    return result
+
+
+def _meta_line(meta) -> int:
+    """Return the 1-based source line for a node's meta, or 0 if unknown"""
+    try:
+        return meta.line
+    except AttributeError:
+        return 0
+
+
+class XdrSemanticError(Exception):
+    """A specification that parses but violates an XDR semantic rule.
+
+    Detection lives in the language-independent front end because a
+    duplicate name is malformed XDR regardless of the output language.
+    """
+
+    def __init__(self, message: str, meta):
+        super().__init__(message)
+        self.message = message
+        self.line = _meta_line(meta)
+        self.column = getattr(meta, "column", 0)
+
+
+def _introduced_names(value):
+    """Yield (name, node) for each identifier a definition introduces."""
+    if isinstance(value, (_XdrStruct, _XdrUnion, _XdrPointer)):
+        yield value.name, value
+    elif isinstance(value, _XdrEnum):
+        yield value.name, value
+        for enumerator in value.enumerators:
+            yield enumerator.name, enumerator
+    elif isinstance(value, _XdrTypedef):
+        yield value.declaration.name, value.declaration
+    elif isinstance(value, _XdrConstant):
+        yield value.name, value
+    elif isinstance(value, _RpcProgram):
+        yield value.name, value
+
+
+def _check_rpc_scope_names(program: "_RpcProgram") -> None:
+    """Enforce RFC 5531 Section 12.3 scoping within an RPC program.
+
+    A version name and number are unique within the program and a
+    procedure name and number are unique within its version.
+    """
+    version_names = set()
+    version_numbers = set()
+    for version in program.versions:
+        if version.name in version_names:
+            raise XdrSemanticError(
+                f"duplicate version name '{version.name}'"
+                f" in program '{program.name}'",
+                version,
+            )
+        version_names.add(version.name)
+        if version.number in version_numbers:
+            raise XdrSemanticError(
+                f"duplicate version number {version.number}"
+                f" in program '{program.name}'",
+                version,
+            )
+        version_numbers.add(version.number)
+        procedure_names = set()
+        procedure_numbers = set()
+        for procedure in version.procedures:
+            if procedure.name in procedure_names:
+                raise XdrSemanticError(
+                    f"duplicate procedure name '{procedure.name}'"
+                    f" in version '{version.name}'",
+                    procedure,
+                )
+            procedure_names.add(procedure.name)
+            if procedure.number in procedure_numbers:
+                raise XdrSemanticError(
+                    f"duplicate procedure number {procedure.number}"
+                    f" in version '{version.name}'",
+                    procedure,
+                )
+            procedure_numbers.add(procedure.number)
+
+
+def check_duplicate_definitions(root: "Specification") -> None:
+    """Reject a spec that declares an identifier more than once.
+
+    RFC 4506 Section 6.4 places constant and type identifiers in a
+    single name space that must be unique within a specification.
+    RFC 5531 Section 12.3 adds RPC program names to that name space
+    and scopes version names and numbers to their program and
+    procedure names and numbers to their version.
+    """
+    seen = {}
+    for definition in root.definitions:
+        for name, node in _introduced_names(definition.value):
+            where = node if node.line else definition.meta
+            first = seen.get(name)
+            if first is not None:
+                raise XdrSemanticError(
+                    f"duplicate identifier '{name}'"
+                    f" (first declared at line {_meta_line(first)})",
+                    where,
+                )
+            seen[name] = where
+        if isinstance(definition.value, _RpcProgram):
+            _check_rpc_scope_names(definition.value)
+
+
+# RFC 5531 (Section 9) encodes program, version, and procedure numbers
+# as unsigned 32-bit integers, so each must fall within [0, 2**32 - 1].
+_RPC_NUMBER_MAX = 2**32 - 1
+
+
+def _check_rpc_number(kind: str, number: int, scope: str, meta) -> None:
+    """Reject one RPC number that is negative or wider than 32 bits."""
+    if number < 0:
+        raise XdrSemanticError(
+            f"negative {kind} number {number} {scope}",
+            meta,
+        )
+    if number > _RPC_NUMBER_MAX:
+        raise XdrSemanticError(
+            f"{kind} number {number} {scope} exceeds {_RPC_NUMBER_MAX}",
+            meta,
+        )
+
+
+def check_rpc_number_range(root: "Specification") -> None:
+    """Reject an out-of-range program, version, or procedure number.
+
+    RFC 5531 assigns only unsigned constants to program, version, and
+    procedure numbers (Section 12.3) and encodes each as an unsigned
+    32-bit integer (Section 9). RFC 4506 Section 6.2 permits a signed
+    decimal constant for XDR constants in general and sets no ceiling on
+    magnitude, so the grammar accepts an out-of-range value; the range
+    is enforced here instead. The parser retains no per-version or
+    per-procedure source location, so a violation is reported against the
+    program definition.
+    """
+    for definition in root.definitions:
+        program = definition.value
+        if not isinstance(program, _RpcProgram):
+            continue
+        _check_rpc_number(
+            "program",
+            program.number,
+            f"in program '{program.name}'",
+            definition.meta,
+        )
+        for version in program.versions:
+            _check_rpc_number(
+                "version",
+                version.number,
+                f"in program '{program.name}'",
+                definition.meta,
+            )
+            for procedure in version.procedures:
+                _check_rpc_number(
+                    "procedure",
+                    procedure.number,
+                    f"in version '{version.name}'",
+                    definition.meta,
+                )
+
+
+def transform_parse_tree(parse_tree):
+    """Transform productions into an abstract syntax tree"""
+    ast = transformer.transform(parse_tree)
+    ast.definitions = _merge_consecutive_passthru(ast.definitions)
+    check_duplicate_definitions(ast)
+    check_rpc_number_range(ast)
+    return ast
+
+
+def get_header_name() -> str:
+    """Return header name set by pragma header directive"""
+    return header_name
diff --git a/tools/net/sunrpc/xdrgen/xdr_parse.py b/tools/net/sunrpc/xdrgen/xdr_parse.py
new file mode 100644
index 000000000..78298553e
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/xdr_parse.py
@@ -0,0 +1,204 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Common parsing code for xdrgen"""
+
+import sys
+from typing import Callable
+
+from lark import Lark
+from lark.exceptions import UnexpectedInput, UnexpectedToken, VisitError
+
+
+# Set to True to emit annotation comments in generated source
+annotate = False
+
+# Set to True to emit enum value validation in decoders
+enum_validation = True
+
+# Map internal Lark token names to human-readable names
+TOKEN_NAMES = {
+    "__ANON_0": "identifier",
+    "__ANON_1": "number",
+    "SEMICOLON": "';'",
+    "LBRACE": "'{'",
+    "RBRACE": "'}'",
+    "LPAR": "'('",
+    "RPAR": "')'",
+    "LSQB": "'['",
+    "RSQB": "']'",
+    "LESSTHAN": "'<'",
+    "MORETHAN": "'>'",
+    "EQUAL": "'='",
+    "COLON": "':'",
+    "COMMA": "','",
+    "STAR": "'*'",
+    "$END": "end of file",
+}
+
+
+class XdrParseError(Exception):
+    """Raised when XDR parsing fails"""
+
+
+def set_xdr_annotate(set_it: bool) -> None:
+    """Set 'annotate' if --annotate was specified on the command line"""
+    global annotate
+    annotate = set_it
+
+
+def get_xdr_annotate() -> bool:
+    """Return True if --annotate was specified on the command line"""
+    return annotate
+
+
+def set_xdr_enum_validation(set_it: bool) -> None:
+    """Set 'enum_validation' based on command line options"""
+    global enum_validation
+    enum_validation = set_it
+
+
+def get_xdr_enum_validation() -> bool:
+    """Return True when enum validation is enabled for decoder generation"""
+    return enum_validation
+
+
+def format_source_caret(line_text: str, column: int) -> list[str]:
+    """Render an offending source line with a caret beneath a column.
+
+    Args:
+        line_text: The raw source line containing the error
+        column: 1-based column of the offending token within line_text
+
+    Returns:
+        Output lines for the diagnostic: a blank separator, the source
+        line with tabs expanded, and a caret aligned under the column.
+    """
+    expanded = line_text.expandtabs()
+    caret = len(line_text[: column - 1].expandtabs())
+    return ["", f"    {expanded}", f"    {' ' * caret}^"]
+
+
+def make_error_handler(source: str, filename: str) -> Callable[[UnexpectedInput], bool]:
+    """Create an error handler that reports the first parse error and aborts.
+
+    Args:
+        source: The XDR source text being parsed
+        filename: The name of the file being parsed
+
+    Returns:
+        An error handler function for use with Lark's on_error parameter
+    """
+    lines = source.splitlines()
+
+    def handle_parse_error(e: UnexpectedInput) -> bool:
+        """Report a parse error with context and abort parsing"""
+        line_num = e.line
+        column = e.column
+        line_text = lines[line_num - 1] if 0 < line_num <= len(lines) else ""
+
+        # Build the error message
+        msg_parts = [f"{filename}:{line_num}:{column}: parse error"]
+
+        # Show what was found vs what was expected
+        if isinstance(e, UnexpectedToken):
+            token = e.token
+            if token.type == "__ANON_0":
+                found = f"identifier '{token.value}'"
+            elif token.type == "__ANON_1":
+                found = f"number '{token.value}'"
+            else:
+                found = f"'{token.value}'"
+            msg_parts.append(f"Unexpected {found}")
+
+            # Provide helpful expected tokens list
+            expected = e.expected
+            if expected:
+                readable = [
+                    TOKEN_NAMES.get(exp, exp.lower().replace("_", " "))
+                    for exp in sorted(expected)
+                ]
+                if len(readable) == 1:
+                    msg_parts.append(f"Expected {readable[0]}")
+                elif len(readable) <= 4:
+                    msg_parts.append(f"Expected one of: {', '.join(readable)}")
+        else:
+            msg_parts.append(str(e).split("\n")[0])
+
+        # Show the offending line with a caret pointing to the error
+        msg_parts.extend(format_source_caret(line_text, column))
+
+        sys.stderr.write("\n".join(msg_parts) + "\n")
+        raise XdrParseError()
+
+    return handle_parse_error
+
+
+def handle_transform_error(e: VisitError, source: str, filename: str) -> None:
+    """Report a transform error with context.
+
+    Args:
+        e: The VisitError from Lark's transformer
+        source: The XDR source text being parsed
+        filename: The name of the file being parsed
+    """
+    lines = source.splitlines()
+
+    # Extract position from the tree node if available
+    line_num = 0
+    column = 0
+    if hasattr(e.obj, "meta") and e.obj.meta:
+        line_num = e.obj.meta.line
+        column = e.obj.meta.column
+
+    line_text = lines[line_num - 1] if 0 < line_num <= len(lines) else ""
+
+    # Build the error message
+    msg_parts = [f"{filename}:{line_num}:{column}: semantic error"]
+
+    # The original exception is typically a KeyError for undefined types
+    if isinstance(e.orig_exc, KeyError):
+        msg_parts.append(f"Undefined type '{e.orig_exc.args[0]}'")
+    else:
+        msg_parts.append(str(e.orig_exc))
+
+    # Show the offending line with a caret pointing to the error
+    if line_text:
+        msg_parts.extend(format_source_caret(line_text, column))
+
+    sys.stderr.write("\n".join(msg_parts) + "\n")
+
+
+def handle_semantic_error(e, source: str, filename: str) -> None:
+    """Report a semantic error (e.g., a duplicate name) with context.
+
+    Args:
+        e: The XdrSemanticError carrying message and source position
+        source: The XDR source text being parsed
+        filename: The name of the file being parsed
+    """
+    lines = source.splitlines()
+    line_num = getattr(e, "line", 0)
+    column = getattr(e, "column", 0)
+    line_text = lines[line_num - 1] if 0 < line_num <= len(lines) else ""
+
+    msg_parts = [f"{filename}:{line_num}:{column}: semantic error", e.message]
+    if line_text:
+        msg_parts.extend(format_source_caret(line_text, column))
+
+    sys.stderr.write("\n".join(msg_parts) + "\n")
+
+
+def xdr_parser() -> Lark:
+    """Return a Lark parser instance configured with the XDR language grammar"""
+
+    return Lark.open(
+        "grammars/xdr.lark",
+        rel_to=__file__,
+        start="specification",
+        debug=True,
+        strict=True,
+        propagate_positions=True,
+        parser="lalr",
+        lexer="contextual",
+    )
diff --git a/tools/net/sunrpc/xdrgen/xdrgen b/tools/net/sunrpc/xdrgen/xdrgen
new file mode 100755
index 000000000..b2fb43f4a
--- /dev/null
+++ b/tools/net/sunrpc/xdrgen/xdrgen
@@ -0,0 +1,143 @@
+#!/usr/bin/env python3
+# ex: set filetype=python:
+
+"""Translate an XDR specification into executable code that
+can be compiled for the Linux kernel."""
+
+__author__ = "Chuck Lever"
+__copyright__ = "Copyright (c) 2024 Oracle and/or its affiliates."
+__license__ = "GPL-2.0 only"
+__version__ = "0.2"
+
+import sys
+from pathlib import Path
+import argparse
+
+_XDRGEN_DIR = Path(__file__).resolve().parent
+if str(_XDRGEN_DIR) not in sys.path:
+    sys.path.insert(0, str(_XDRGEN_DIR))
+
+from subcmds import definitions
+from subcmds import declarations
+from subcmds import lint
+from subcmds import source
+
+
+sys.path.insert(1, "@pythondir@")
+
+
+def main() -> int:
+    """Parse command-line options"""
+    parser = argparse.ArgumentParser(
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+        description="Convert an XDR specification to Linux kernel source code",
+        epilog="""\
+Copyright (c) 2024 Oracle and/or its affiliates.
+
+License GPLv2: <http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt>
+This is free software.  You are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law.""",
+    )
+    parser.add_argument(
+        "--version",
+        help="Display the version of this tool",
+        action="version",
+        version=__version__,
+    )
+
+    subcommands = parser.add_subparsers(title="Subcommands", required=True)
+
+    definitions_parser = subcommands.add_parser(
+        "definitions", help="Generate XDR definitions"
+    )
+    definitions_parser.add_argument(
+        "--annotate",
+        action="store_true",
+        default=False,
+        help="Add annotation comments",
+    )
+    definitions_parser.add_argument(
+        "--language",
+        action="store_true",
+        default="C",
+        help="Output language",
+    )
+    definitions_parser.add_argument(
+        "--peer",
+        choices=["server", "client",],
+        default="server",
+        help="Generate header code for client or server side",
+        type=str,
+    )
+    definitions_parser.add_argument("filename", help="File containing an XDR specification")
+    definitions_parser.set_defaults(func=definitions.subcmd)
+
+    declarations_parser = subcommands.add_parser(
+        "declarations", help="Generate function declarations"
+    )
+    declarations_parser.add_argument(
+        "--annotate",
+        action="store_true",
+        default=False,
+        help="Add annotation comments",
+    )
+    declarations_parser.add_argument(
+        "--language",
+        action="store_true",
+        default="C",
+        help="Output language",
+    )
+    declarations_parser.add_argument(
+        "--peer",
+        choices=["server", "client",],
+        default="server",
+        help="Generate code for client or server side",
+        type=str,
+    )
+    declarations_parser.add_argument("filename", help="File containing an XDR specification")
+    declarations_parser.set_defaults(func=declarations.subcmd)
+
+    linter_parser = subcommands.add_parser("lint", help="Check an XDR specification")
+    linter_parser.add_argument("filename", help="File containing an XDR specification")
+    linter_parser.set_defaults(func=lint.subcmd)
+
+    source_parser = subcommands.add_parser(
+        "source", help="Generate XDR encoder and decoder source code"
+    )
+    source_parser.add_argument(
+        "--annotate",
+        action="store_true",
+        default=False,
+        help="Add annotation comments",
+    )
+    source_parser.add_argument(
+        "--language",
+        action="store_true",
+        default="C",
+        help="Output language",
+    )
+    source_parser.add_argument(
+        "--peer",
+        choices=["server", "client",],
+        default="server",
+        help="Generate code for client or server side",
+        type=str,
+    )
+    source_parser.add_argument(
+        "--no-enum-validation",
+        action="store_true",
+        default=False,
+        help="Disable enum value validation in decoders",
+    )
+    source_parser.add_argument("filename", help="File containing an XDR specification")
+    source_parser.set_defaults(func=source.subcmd)
+
+    args = parser.parse_args()
+    return args.func(args)
+
+
+try:
+    if __name__ == "__main__":
+        sys.exit(main())
+except (KeyboardInterrupt, BrokenPipeError):
+    sys.exit(1)