kbuild: rust: keep Rust objects out of Clang LTO with inline helpersgrafted

Under `CONFIG_LTO_CLANG` + `CONFIG_RUST_INLINE_HELPERS`, one may hit
`objtool` errors such as:

    vmlinux.o: error: objtool: _R..._3Gsp4boot+0xd6a:
    can't find jump dest instruction at .text._R..._3Gsp4boot+0x1dfd

The reason is that in such builds, the Clang invocation that compiles
the combined Rust plus helpers bitcode emits LLVM bitcode (again) --
the final code generation happens in the linker's LTO step, which the
`-mllvm` trap options passed to Clang do not reach.

This, in turn, means that unreachable traps are missing, and the
impossible paths do not merely fallthrough to the next symbol, but past
the end of their own section, since LTO builds place each function in
its own section.

Thus filter `CC_FLAGS_LTO` out of the Clang invocation, so that it always
emits machine code directly, with the traps in place.

Assisted-by: LLM
Cc: Gary Guo <gary@garyguo.net>
Cc: Boqun Feng <boqun@kernel.org>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Matthew Maurer <mmaurer@google.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Fixes: 3a2486cc1da5 ("kbuild: rust: provide an option to inline C helpers into Rust")
Acked-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260816133233.197500-2-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

1 files changed, 556 insertions, 0 deletions

diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
new file mode 100644
index 000000000..bfc06d171
--- /dev/null
+++ b/net/ipv4/proc.c
@@ -0,0 +1,556 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * INET		An implementation of the TCP/IP protocol suite for the LINUX
+ *		operating system.  INET is implemented using the  BSD Socket
+ *		interface as the means of communication with the user level.
+ *
+ *		This file implements the various access functions for the
+ *		PROC file system.  It is mainly used for debugging and
+ *		statistics.
+ *
+ * Authors:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *		Gerald J. Heim, <heim@peanuts.informatik.uni-tuebingen.de>
+ *		Fred Baumgarten, <dc6iq@insu1.etec.uni-karlsruhe.de>
+ *		Erik Schoenfelder, <schoenfr@ibr.cs.tu-bs.de>
+ *
+ * Fixes:
+ *		Alan Cox	:	UDP sockets show the rxqueue/txqueue
+ *					using hint flag for the netinfo.
+ *	Pauline Middelink	:	identd support
+ *		Alan Cox	:	Make /proc safer.
+ *	Erik Schoenfelder	:	/proc/net/snmp
+ *		Alan Cox	:	Handle dead sockets properly.
+ *	Gerhard Koerting	:	Show both timers
+ *		Alan Cox	:	Allow inode to be NULL (kernel socket)
+ *	Andi Kleen		:	Add support for open_requests and
+ *					split functions for more readibility.
+ *	Andi Kleen		:	Add support for /proc/net/netstat
+ *	Arnaldo C. Melo		:	Convert to seq_file
+ */
+#include <linux/types.h>
+#include <net/net_namespace.h>
+#include <net/icmp.h>
+#include <net/protocol.h>
+#include <net/tcp.h>
+#include <net/mptcp.h>
+#include <net/proto_memory.h>
+#include <net/udp.h>
+#include <linux/bottom_half.h>
+#include <linux/inetdevice.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/export.h>
+#include <net/sock.h>
+#include <net/raw.h>
+
+#define TCPUDP_MIB_MAX MAX_T(u32, UDP_MIB_MAX, TCP_MIB_MAX)
+
+/*
+ *	Report socket allocation statistics [mea@utu.fi]
+ */
+static int sockstat_seq_show(struct seq_file *seq, void *v)
+{
+	struct net *net = seq->private;
+	int orphans, sockets;
+
+	orphans = tcp_orphan_count_sum();
+	sockets = proto_sockets_allocated_sum_positive(&tcp_prot);
+
+	socket_seq_show(seq);
+	seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %ld\n",
+		   sock_prot_inuse_get(net, &tcp_prot), orphans,
+		   refcount_read(&net->ipv4.tcp_death_row.tw_refcount) - 1,
+		   sockets, proto_memory_allocated(&tcp_prot));
+	seq_printf(seq, "UDP: inuse %d mem %ld\n",
+		   sock_prot_inuse_get(net, &udp_prot),
+		   proto_memory_allocated(&udp_prot));
+	seq_printf(seq, "RAW: inuse %d\n",
+		   sock_prot_inuse_get(net, &raw_prot));
+	seq_printf(seq,  "FRAG: inuse %u memory %lu\n",
+		   atomic_read(&net->ipv4.fqdir->rhashtable.nelems),
+		   frag_mem_limit(net->ipv4.fqdir));
+	return 0;
+}
+
+/* snmp items */
+static const struct snmp_mib snmp4_ipstats_list[] = {
+	SNMP_MIB_ITEM("InReceives", IPSTATS_MIB_INPKTS),
+	SNMP_MIB_ITEM("InHdrErrors", IPSTATS_MIB_INHDRERRORS),
+	SNMP_MIB_ITEM("InAddrErrors", IPSTATS_MIB_INADDRERRORS),
+	SNMP_MIB_ITEM("ForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
+	SNMP_MIB_ITEM("InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
+	SNMP_MIB_ITEM("InDiscards", IPSTATS_MIB_INDISCARDS),
+	SNMP_MIB_ITEM("InDelivers", IPSTATS_MIB_INDELIVERS),
+	SNMP_MIB_ITEM("OutRequests", IPSTATS_MIB_OUTREQUESTS),
+	SNMP_MIB_ITEM("OutDiscards", IPSTATS_MIB_OUTDISCARDS),
+	SNMP_MIB_ITEM("OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
+	SNMP_MIB_ITEM("ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
+	SNMP_MIB_ITEM("ReasmReqds", IPSTATS_MIB_REASMREQDS),
+	SNMP_MIB_ITEM("ReasmOKs", IPSTATS_MIB_REASMOKS),
+	SNMP_MIB_ITEM("ReasmFails", IPSTATS_MIB_REASMFAILS),
+	SNMP_MIB_ITEM("FragOKs", IPSTATS_MIB_FRAGOKS),
+	SNMP_MIB_ITEM("FragFails", IPSTATS_MIB_FRAGFAILS),
+	SNMP_MIB_ITEM("FragCreates", IPSTATS_MIB_FRAGCREATES),
+	SNMP_MIB_ITEM("OutTransmits", IPSTATS_MIB_OUTPKTS),
+};
+
+/* Following items are displayed in /proc/net/netstat */
+static const struct snmp_mib snmp4_ipextstats_list[] = {
+	SNMP_MIB_ITEM("InNoRoutes", IPSTATS_MIB_INNOROUTES),
+	SNMP_MIB_ITEM("InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
+	SNMP_MIB_ITEM("InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
+	SNMP_MIB_ITEM("OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
+	SNMP_MIB_ITEM("InBcastPkts", IPSTATS_MIB_INBCASTPKTS),
+	SNMP_MIB_ITEM("OutBcastPkts", IPSTATS_MIB_OUTBCASTPKTS),
+	SNMP_MIB_ITEM("InOctets", IPSTATS_MIB_INOCTETS),
+	SNMP_MIB_ITEM("OutOctets", IPSTATS_MIB_OUTOCTETS),
+	SNMP_MIB_ITEM("InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
+	SNMP_MIB_ITEM("OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
+	SNMP_MIB_ITEM("InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
+	SNMP_MIB_ITEM("OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
+	/* Non RFC4293 fields */
+	SNMP_MIB_ITEM("InCsumErrors", IPSTATS_MIB_CSUMERRORS),
+	SNMP_MIB_ITEM("InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
+	SNMP_MIB_ITEM("InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
+	SNMP_MIB_ITEM("InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
+	SNMP_MIB_ITEM("InCEPkts", IPSTATS_MIB_CEPKTS),
+	SNMP_MIB_ITEM("ReasmOverlaps", IPSTATS_MIB_REASM_OVERLAPS),
+};
+
+static const struct {
+	const char *name;
+	int index;
+} icmpmibmap[] = {
+	{ "DestUnreachs", ICMP_DEST_UNREACH },
+	{ "TimeExcds", ICMP_TIME_EXCEEDED },
+	{ "ParmProbs", ICMP_PARAMETERPROB },
+	{ "SrcQuenchs", ICMP_SOURCE_QUENCH },
+	{ "Redirects", ICMP_REDIRECT },
+	{ "Echos", ICMP_ECHO },
+	{ "EchoReps", ICMP_ECHOREPLY },
+	{ "Timestamps", ICMP_TIMESTAMP },
+	{ "TimestampReps", ICMP_TIMESTAMPREPLY },
+	{ "AddrMasks", ICMP_ADDRESS },
+	{ "AddrMaskReps", ICMP_ADDRESSREPLY },
+	{ NULL, 0 }
+};
+
+
+static const struct snmp_mib snmp4_tcp_list[] = {
+	SNMP_MIB_ITEM("RtoAlgorithm", TCP_MIB_RTOALGORITHM),
+	SNMP_MIB_ITEM("RtoMin", TCP_MIB_RTOMIN),
+	SNMP_MIB_ITEM("RtoMax", TCP_MIB_RTOMAX),
+	SNMP_MIB_ITEM("MaxConn", TCP_MIB_MAXCONN),
+	SNMP_MIB_ITEM("ActiveOpens", TCP_MIB_ACTIVEOPENS),
+	SNMP_MIB_ITEM("PassiveOpens", TCP_MIB_PASSIVEOPENS),
+	SNMP_MIB_ITEM("AttemptFails", TCP_MIB_ATTEMPTFAILS),
+	SNMP_MIB_ITEM("EstabResets", TCP_MIB_ESTABRESETS),
+	SNMP_MIB_ITEM("CurrEstab", TCP_MIB_CURRESTAB),
+	SNMP_MIB_ITEM("InSegs", TCP_MIB_INSEGS),
+	SNMP_MIB_ITEM("OutSegs", TCP_MIB_OUTSEGS),
+	SNMP_MIB_ITEM("RetransSegs", TCP_MIB_RETRANSSEGS),
+	SNMP_MIB_ITEM("InErrs", TCP_MIB_INERRS),
+	SNMP_MIB_ITEM("OutRsts", TCP_MIB_OUTRSTS),
+	SNMP_MIB_ITEM("InCsumErrors", TCP_MIB_CSUMERRORS),
+};
+
+static const struct snmp_mib snmp4_udp_list[] = {
+	SNMP_MIB_ITEM("InDatagrams", UDP_MIB_INDATAGRAMS),
+	SNMP_MIB_ITEM("NoPorts", UDP_MIB_NOPORTS),
+	SNMP_MIB_ITEM("InErrors", UDP_MIB_INERRORS),
+	SNMP_MIB_ITEM("OutDatagrams", UDP_MIB_OUTDATAGRAMS),
+	SNMP_MIB_ITEM("RcvbufErrors", UDP_MIB_RCVBUFERRORS),
+	SNMP_MIB_ITEM("SndbufErrors", UDP_MIB_SNDBUFERRORS),
+	SNMP_MIB_ITEM("InCsumErrors", UDP_MIB_CSUMERRORS),
+	SNMP_MIB_ITEM("IgnoredMulti", UDP_MIB_IGNOREDMULTI),
+	SNMP_MIB_ITEM("MemErrors", UDP_MIB_MEMERRORS),
+};
+
+static const struct snmp_mib snmp4_net_list[] = {
+	SNMP_MIB_ITEM("SyncookiesSent", LINUX_MIB_SYNCOOKIESSENT),
+	SNMP_MIB_ITEM("SyncookiesRecv", LINUX_MIB_SYNCOOKIESRECV),
+	SNMP_MIB_ITEM("SyncookiesFailed", LINUX_MIB_SYNCOOKIESFAILED),
+	SNMP_MIB_ITEM("EmbryonicRsts", LINUX_MIB_EMBRYONICRSTS),
+	SNMP_MIB_ITEM("PruneCalled", LINUX_MIB_PRUNECALLED),
+	SNMP_MIB_ITEM("RcvPruned", LINUX_MIB_RCVPRUNED),
+	SNMP_MIB_ITEM("OfoPruned", LINUX_MIB_OFOPRUNED),
+	SNMP_MIB_ITEM("OutOfWindowIcmps", LINUX_MIB_OUTOFWINDOWICMPS),
+	SNMP_MIB_ITEM("LockDroppedIcmps", LINUX_MIB_LOCKDROPPEDICMPS),
+	SNMP_MIB_ITEM("ArpFilter", LINUX_MIB_ARPFILTER),
+	SNMP_MIB_ITEM("TW", LINUX_MIB_TIMEWAITED),
+	SNMP_MIB_ITEM("TWRecycled", LINUX_MIB_TIMEWAITRECYCLED),
+	SNMP_MIB_ITEM("TWKilled", LINUX_MIB_TIMEWAITKILLED),
+	SNMP_MIB_ITEM("PAWSActive", LINUX_MIB_PAWSACTIVEREJECTED),
+	SNMP_MIB_ITEM("PAWSEstab", LINUX_MIB_PAWSESTABREJECTED),
+	SNMP_MIB_ITEM("BeyondWindow", LINUX_MIB_BEYOND_WINDOW),
+	SNMP_MIB_ITEM("TSEcrRejected", LINUX_MIB_TSECRREJECTED),
+	SNMP_MIB_ITEM("PAWSOldAck", LINUX_MIB_PAWS_OLD_ACK),
+	SNMP_MIB_ITEM("PAWSTimewait", LINUX_MIB_PAWS_TW_REJECTED),
+	SNMP_MIB_ITEM("DelayedACKs", LINUX_MIB_DELAYEDACKS),
+	SNMP_MIB_ITEM("DelayedACKLocked", LINUX_MIB_DELAYEDACKLOCKED),
+	SNMP_MIB_ITEM("DelayedACKLost", LINUX_MIB_DELAYEDACKLOST),
+	SNMP_MIB_ITEM("ListenOverflows", LINUX_MIB_LISTENOVERFLOWS),
+	SNMP_MIB_ITEM("ListenDrops", LINUX_MIB_LISTENDROPS),
+	SNMP_MIB_ITEM("TCPHPHits", LINUX_MIB_TCPHPHITS),
+	SNMP_MIB_ITEM("TCPPureAcks", LINUX_MIB_TCPPUREACKS),
+	SNMP_MIB_ITEM("TCPHPAcks", LINUX_MIB_TCPHPACKS),
+	SNMP_MIB_ITEM("TCPRenoRecovery", LINUX_MIB_TCPRENORECOVERY),
+	SNMP_MIB_ITEM("TCPSackRecovery", LINUX_MIB_TCPSACKRECOVERY),
+	SNMP_MIB_ITEM("TCPSACKReneging", LINUX_MIB_TCPSACKRENEGING),
+	SNMP_MIB_ITEM("TCPSACKReorder", LINUX_MIB_TCPSACKREORDER),
+	SNMP_MIB_ITEM("TCPRenoReorder", LINUX_MIB_TCPRENOREORDER),
+	SNMP_MIB_ITEM("TCPTSReorder", LINUX_MIB_TCPTSREORDER),
+	SNMP_MIB_ITEM("TCPFullUndo", LINUX_MIB_TCPFULLUNDO),
+	SNMP_MIB_ITEM("TCPPartialUndo", LINUX_MIB_TCPPARTIALUNDO),
+	SNMP_MIB_ITEM("TCPDSACKUndo", LINUX_MIB_TCPDSACKUNDO),
+	SNMP_MIB_ITEM("TCPLossUndo", LINUX_MIB_TCPLOSSUNDO),
+	SNMP_MIB_ITEM("TCPLostRetransmit", LINUX_MIB_TCPLOSTRETRANSMIT),
+	SNMP_MIB_ITEM("TCPRenoFailures", LINUX_MIB_TCPRENOFAILURES),
+	SNMP_MIB_ITEM("TCPSackFailures", LINUX_MIB_TCPSACKFAILURES),
+	SNMP_MIB_ITEM("TCPLossFailures", LINUX_MIB_TCPLOSSFAILURES),
+	SNMP_MIB_ITEM("TCPFastRetrans", LINUX_MIB_TCPFASTRETRANS),
+	SNMP_MIB_ITEM("TCPSlowStartRetrans", LINUX_MIB_TCPSLOWSTARTRETRANS),
+	SNMP_MIB_ITEM("TCPTimeouts", LINUX_MIB_TCPTIMEOUTS),
+	SNMP_MIB_ITEM("TCPLossProbes", LINUX_MIB_TCPLOSSPROBES),
+	SNMP_MIB_ITEM("TCPLossProbeRecovery", LINUX_MIB_TCPLOSSPROBERECOVERY),
+	SNMP_MIB_ITEM("TCPRenoRecoveryFail", LINUX_MIB_TCPRENORECOVERYFAIL),
+	SNMP_MIB_ITEM("TCPSackRecoveryFail", LINUX_MIB_TCPSACKRECOVERYFAIL),
+	SNMP_MIB_ITEM("TCPRcvCollapsed", LINUX_MIB_TCPRCVCOLLAPSED),
+	SNMP_MIB_ITEM("TCPBacklogCoalesce", LINUX_MIB_TCPBACKLOGCOALESCE),
+	SNMP_MIB_ITEM("TCPDSACKOldSent", LINUX_MIB_TCPDSACKOLDSENT),
+	SNMP_MIB_ITEM("TCPDSACKOfoSent", LINUX_MIB_TCPDSACKOFOSENT),
+	SNMP_MIB_ITEM("TCPDSACKRecv", LINUX_MIB_TCPDSACKRECV),
+	SNMP_MIB_ITEM("TCPDSACKOfoRecv", LINUX_MIB_TCPDSACKOFORECV),
+	SNMP_MIB_ITEM("TCPAbortOnData", LINUX_MIB_TCPABORTONDATA),
+	SNMP_MIB_ITEM("TCPAbortOnClose", LINUX_MIB_TCPABORTONCLOSE),
+	SNMP_MIB_ITEM("TCPAbortOnMemory", LINUX_MIB_TCPABORTONMEMORY),
+	SNMP_MIB_ITEM("TCPAbortOnTimeout", LINUX_MIB_TCPABORTONTIMEOUT),
+	SNMP_MIB_ITEM("TCPAbortOnLinger", LINUX_MIB_TCPABORTONLINGER),
+	SNMP_MIB_ITEM("TCPAbortFailed", LINUX_MIB_TCPABORTFAILED),
+	SNMP_MIB_ITEM("TCPMemoryPressures", LINUX_MIB_TCPMEMORYPRESSURES),
+	SNMP_MIB_ITEM("TCPMemoryPressuresChrono", LINUX_MIB_TCPMEMORYPRESSURESCHRONO),
+	SNMP_MIB_ITEM("TCPSACKDiscard", LINUX_MIB_TCPSACKDISCARD),
+	SNMP_MIB_ITEM("TCPDSACKIgnoredOld", LINUX_MIB_TCPDSACKIGNOREDOLD),
+	SNMP_MIB_ITEM("TCPDSACKIgnoredNoUndo", LINUX_MIB_TCPDSACKIGNOREDNOUNDO),
+	SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
+	SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
+	SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
+	SNMP_MIB_ITEM("TCPMD5Failure", LINUX_MIB_TCPMD5FAILURE),
+	SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
+	SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
+	SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
+	SNMP_MIB_ITEM("TCPBacklogDrop", LINUX_MIB_TCPBACKLOGDROP),
+	SNMP_MIB_ITEM("PFMemallocDrop", LINUX_MIB_PFMEMALLOCDROP),
+	SNMP_MIB_ITEM("TCPMinTTLDrop", LINUX_MIB_TCPMINTTLDROP),
+	SNMP_MIB_ITEM("TCPDeferAcceptDrop", LINUX_MIB_TCPDEFERACCEPTDROP),
+	SNMP_MIB_ITEM("IPReversePathFilter", LINUX_MIB_IPRPFILTER),
+	SNMP_MIB_ITEM("TCPTimeWaitOverflow", LINUX_MIB_TCPTIMEWAITOVERFLOW),
+	SNMP_MIB_ITEM("TCPReqQFullDoCookies", LINUX_MIB_TCPREQQFULLDOCOOKIES),
+	SNMP_MIB_ITEM("TCPReqQFullDrop", LINUX_MIB_TCPREQQFULLDROP),
+	SNMP_MIB_ITEM("TCPRetransFail", LINUX_MIB_TCPRETRANSFAIL),
+	SNMP_MIB_ITEM("TCPRcvCoalesce", LINUX_MIB_TCPRCVCOALESCE),
+	SNMP_MIB_ITEM("TCPOFOQueue", LINUX_MIB_TCPOFOQUEUE),
+	SNMP_MIB_ITEM("TCPOFODrop", LINUX_MIB_TCPOFODROP),
+	SNMP_MIB_ITEM("TCPOFOMerge", LINUX_MIB_TCPOFOMERGE),
+	SNMP_MIB_ITEM("TCPChallengeACK", LINUX_MIB_TCPCHALLENGEACK),
+	SNMP_MIB_ITEM("TCPSYNChallenge", LINUX_MIB_TCPSYNCHALLENGE),
+	SNMP_MIB_ITEM("TCPFastOpenActive", LINUX_MIB_TCPFASTOPENACTIVE),
+	SNMP_MIB_ITEM("TCPFastOpenActiveFail", LINUX_MIB_TCPFASTOPENACTIVEFAIL),
+	SNMP_MIB_ITEM("TCPFastOpenPassive", LINUX_MIB_TCPFASTOPENPASSIVE),
+	SNMP_MIB_ITEM("TCPFastOpenPassiveFail", LINUX_MIB_TCPFASTOPENPASSIVEFAIL),
+	SNMP_MIB_ITEM("TCPFastOpenListenOverflow", LINUX_MIB_TCPFASTOPENLISTENOVERFLOW),
+	SNMP_MIB_ITEM("TCPFastOpenCookieReqd", LINUX_MIB_TCPFASTOPENCOOKIEREQD),
+	SNMP_MIB_ITEM("TCPFastOpenBlackhole", LINUX_MIB_TCPFASTOPENBLACKHOLE),
+	SNMP_MIB_ITEM("TCPSpuriousRtxHostQueues", LINUX_MIB_TCPSPURIOUS_RTX_HOSTQUEUES),
+	SNMP_MIB_ITEM("BusyPollRxPackets", LINUX_MIB_BUSYPOLLRXPACKETS),
+	SNMP_MIB_ITEM("TCPAutoCorking", LINUX_MIB_TCPAUTOCORKING),
+	SNMP_MIB_ITEM("TCPFromZeroWindowAdv", LINUX_MIB_TCPFROMZEROWINDOWADV),
+	SNMP_MIB_ITEM("TCPToZeroWindowAdv", LINUX_MIB_TCPTOZEROWINDOWADV),
+	SNMP_MIB_ITEM("TCPWantZeroWindowAdv", LINUX_MIB_TCPWANTZEROWINDOWADV),
+	SNMP_MIB_ITEM("TCPSynRetrans", LINUX_MIB_TCPSYNRETRANS),
+	SNMP_MIB_ITEM("TCPOrigDataSent", LINUX_MIB_TCPORIGDATASENT),
+	SNMP_MIB_ITEM("TCPHystartTrainDetect", LINUX_MIB_TCPHYSTARTTRAINDETECT),
+	SNMP_MIB_ITEM("TCPHystartTrainCwnd", LINUX_MIB_TCPHYSTARTTRAINCWND),
+	SNMP_MIB_ITEM("TCPHystartDelayDetect", LINUX_MIB_TCPHYSTARTDELAYDETECT),
+	SNMP_MIB_ITEM("TCPHystartDelayCwnd", LINUX_MIB_TCPHYSTARTDELAYCWND),
+	SNMP_MIB_ITEM("TCPACKSkippedSynRecv", LINUX_MIB_TCPACKSKIPPEDSYNRECV),
+	SNMP_MIB_ITEM("TCPACKSkippedPAWS", LINUX_MIB_TCPACKSKIPPEDPAWS),
+	SNMP_MIB_ITEM("TCPACKSkippedSeq", LINUX_MIB_TCPACKSKIPPEDSEQ),
+	SNMP_MIB_ITEM("TCPACKSkippedFinWait2", LINUX_MIB_TCPACKSKIPPEDFINWAIT2),
+	SNMP_MIB_ITEM("TCPACKSkippedTimeWait", LINUX_MIB_TCPACKSKIPPEDTIMEWAIT),
+	SNMP_MIB_ITEM("TCPACKSkippedChallenge", LINUX_MIB_TCPACKSKIPPEDCHALLENGE),
+	SNMP_MIB_ITEM("TCPWinProbe", LINUX_MIB_TCPWINPROBE),
+	SNMP_MIB_ITEM("TCPKeepAlive", LINUX_MIB_TCPKEEPALIVE),
+	SNMP_MIB_ITEM("TCPMTUPFail", LINUX_MIB_TCPMTUPFAIL),
+	SNMP_MIB_ITEM("TCPMTUPSuccess", LINUX_MIB_TCPMTUPSUCCESS),
+	SNMP_MIB_ITEM("TCPDelivered", LINUX_MIB_TCPDELIVERED),
+	SNMP_MIB_ITEM("TCPDeliveredCE", LINUX_MIB_TCPDELIVEREDCE),
+	SNMP_MIB_ITEM("TCPAckCompressed", LINUX_MIB_TCPACKCOMPRESSED),
+	SNMP_MIB_ITEM("TCPZeroWindowDrop", LINUX_MIB_TCPZEROWINDOWDROP),
+	SNMP_MIB_ITEM("TCPRcvQDrop", LINUX_MIB_TCPRCVQDROP),
+	SNMP_MIB_ITEM("TCPWqueueTooBig", LINUX_MIB_TCPWQUEUETOOBIG),
+	SNMP_MIB_ITEM("TCPFastOpenPassiveAltKey", LINUX_MIB_TCPFASTOPENPASSIVEALTKEY),
+	SNMP_MIB_ITEM("TcpTimeoutRehash", LINUX_MIB_TCPTIMEOUTREHASH),
+	SNMP_MIB_ITEM("TcpDuplicateDataRehash", LINUX_MIB_TCPDUPLICATEDATAREHASH),
+	SNMP_MIB_ITEM("TCPDSACKRecvSegs", LINUX_MIB_TCPDSACKRECVSEGS),
+	SNMP_MIB_ITEM("TCPDSACKIgnoredDubious", LINUX_MIB_TCPDSACKIGNOREDDUBIOUS),
+	SNMP_MIB_ITEM("TCPMigrateReqSuccess", LINUX_MIB_TCPMIGRATEREQSUCCESS),
+	SNMP_MIB_ITEM("TCPMigrateReqFailure", LINUX_MIB_TCPMIGRATEREQFAILURE),
+	SNMP_MIB_ITEM("TCPPLBRehash", LINUX_MIB_TCPPLBREHASH),
+	SNMP_MIB_ITEM("TCPAORequired", LINUX_MIB_TCPAOREQUIRED),
+	SNMP_MIB_ITEM("TCPAOBad", LINUX_MIB_TCPAOBAD),
+	SNMP_MIB_ITEM("TCPAOKeyNotFound", LINUX_MIB_TCPAOKEYNOTFOUND),
+	SNMP_MIB_ITEM("TCPAOGood", LINUX_MIB_TCPAOGOOD),
+	SNMP_MIB_ITEM("TCPAODroppedIcmps", LINUX_MIB_TCPAODROPPEDICMPS),
+};
+
+static void icmpmsg_put_line(struct seq_file *seq, unsigned long *vals,
+			     unsigned short *type, int count)
+{
+	int j;
+
+	if (count) {
+		seq_puts(seq, "\nIcmpMsg:");
+		for (j = 0; j < count; ++j)
+			seq_printf(seq, " %sType%u",
+				type[j] & 0x100 ? "Out" : "In",
+				type[j] & 0xff);
+		seq_puts(seq, "\nIcmpMsg:");
+		for (j = 0; j < count; ++j)
+			seq_printf(seq, " %lu", vals[j]);
+	}
+}
+
+static void icmpmsg_put(struct seq_file *seq)
+{
+#define PERLINE	16
+
+	int i, count;
+	unsigned short type[PERLINE];
+	unsigned long vals[PERLINE], val;
+	struct net *net = seq->private;
+
+	count = 0;
+	for (i = 0; i < ICMPMSG_MIB_MAX; i++) {
+		val = atomic_long_read(&net->mib.icmpmsg_statistics->mibs[i]);
+		if (val) {
+			type[count] = i;
+			vals[count++] = val;
+		}
+		if (count == PERLINE) {
+			icmpmsg_put_line(seq, vals, type, count);
+			count = 0;
+		}
+	}
+	icmpmsg_put_line(seq, vals, type, count);
+
+#undef PERLINE
+}
+
+static void icmp_put(struct seq_file *seq)
+{
+	int i;
+	struct net *net = seq->private;
+	atomic_long_t *ptr = net->mib.icmpmsg_statistics->mibs;
+
+	seq_puts(seq, "\nIcmp: InMsgs InErrors InCsumErrors");
+	for (i = 0; icmpmibmap[i].name; i++)
+		seq_printf(seq, " In%s", icmpmibmap[i].name);
+	seq_puts(seq, " OutMsgs OutErrors OutRateLimitGlobal OutRateLimitHost");
+	for (i = 0; icmpmibmap[i].name; i++)
+		seq_printf(seq, " Out%s", icmpmibmap[i].name);
+	seq_printf(seq, "\nIcmp: %lu %lu %lu",
+		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_INMSGS),
+		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_INERRORS),
+		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_CSUMERRORS));
+	for (i = 0; icmpmibmap[i].name; i++)
+		seq_printf(seq, " %lu",
+			   atomic_long_read(ptr + icmpmibmap[i].index));
+	seq_printf(seq, " %lu %lu %lu %lu",
+		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTMSGS),
+		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_OUTERRORS),
+		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_RATELIMITGLOBAL),
+		snmp_fold_field(net->mib.icmp_statistics, ICMP_MIB_RATELIMITHOST));
+	for (i = 0; icmpmibmap[i].name; i++)
+		seq_printf(seq, " %lu",
+			   atomic_long_read(ptr + (icmpmibmap[i].index | 0x100)));
+}
+
+/*
+ *	Called from the PROCfs module. This outputs /proc/net/snmp.
+ */
+static int snmp_seq_show_ipstats(struct seq_file *seq, void *v)
+{
+	const int cnt = ARRAY_SIZE(snmp4_ipstats_list);
+	u64 buff64[ARRAY_SIZE(snmp4_ipstats_list)];
+	struct net *net = seq->private;
+	int i;
+
+	memset(buff64, 0, sizeof(buff64));
+
+	seq_puts(seq, "Ip: Forwarding DefaultTTL");
+	for (i = 0; i < cnt; i++)
+		seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
+
+	seq_printf(seq, "\nIp: %d %d",
+		   IPV4_DEVCONF_ALL_RO(net, FORWARDING) ? 1 : 2,
+		   READ_ONCE(net->ipv4.sysctl_ip_default_ttl));
+
+	BUILD_BUG_ON(offsetof(struct ipstats_mib, mibs) != 0);
+	snmp_get_cpu_field64_batch_cnt(buff64, snmp4_ipstats_list, cnt,
+				       net->mib.ip_statistics,
+				       offsetof(struct ipstats_mib, syncp));
+	for (i = 0; i < cnt; i++)
+		seq_printf(seq, " %llu", buff64[i]);
+
+	return 0;
+}
+
+static int snmp_seq_show_tcp_udp(struct seq_file *seq, void *v)
+{
+	const int udp_cnt = ARRAY_SIZE(snmp4_udp_list);
+	const int tcp_cnt = ARRAY_SIZE(snmp4_tcp_list);
+	unsigned long buff[TCPUDP_MIB_MAX];
+	struct net *net = seq->private;
+	int i;
+
+	memset(buff, 0, tcp_cnt * sizeof(unsigned long));
+
+	seq_puts(seq, "\nTcp:");
+	for (i = 0; i < tcp_cnt; i++)
+		seq_printf(seq, " %s", snmp4_tcp_list[i].name);
+
+	seq_puts(seq, "\nTcp:");
+	snmp_get_cpu_field_batch_cnt(buff, snmp4_tcp_list,
+				     tcp_cnt,
+				     net->mib.tcp_statistics);
+	for (i = 0; i < tcp_cnt; i++) {
+		/* MaxConn field is signed, RFC 2012 */
+		if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
+			seq_printf(seq, " %ld", buff[i]);
+		else
+			seq_printf(seq, " %lu", buff[i]);
+	}
+
+	memset(buff, 0, udp_cnt * sizeof(unsigned long));
+
+	snmp_get_cpu_field_batch_cnt(buff, snmp4_udp_list,
+				     udp_cnt,
+				     net->mib.udp_statistics);
+	seq_puts(seq, "\nUdp:");
+	for (i = 0; i < udp_cnt; i++)
+		seq_printf(seq, " %s", snmp4_udp_list[i].name);
+	seq_puts(seq, "\nUdp:");
+	for (i = 0; i < udp_cnt; i++)
+		seq_printf(seq, " %lu", buff[i]);
+
+	seq_putc(seq, '\n');
+	return 0;
+}
+
+static int snmp_seq_show(struct seq_file *seq, void *v)
+{
+	snmp_seq_show_ipstats(seq, v);
+
+	icmp_put(seq);	/* RFC 2011 compatibility */
+	icmpmsg_put(seq);
+
+	snmp_seq_show_tcp_udp(seq, v);
+
+	return 0;
+}
+
+/*
+ *	Output /proc/net/netstat
+ */
+static int netstat_seq_show(struct seq_file *seq, void *v)
+{
+	const int ip_cnt = ARRAY_SIZE(snmp4_ipextstats_list);
+	const int tcp_cnt = ARRAY_SIZE(snmp4_net_list);
+	struct net *net = seq->private;
+	unsigned long *buff;
+	int i;
+
+	seq_puts(seq, "TcpExt:");
+	for (i = 0; i < tcp_cnt; i++)
+		seq_printf(seq, " %s", snmp4_net_list[i].name);
+
+	seq_puts(seq, "\nTcpExt:");
+	buff = kzalloc(max(tcp_cnt * sizeof(long), ip_cnt * sizeof(u64)),
+		       GFP_KERNEL);
+	if (buff) {
+		snmp_get_cpu_field_batch_cnt(buff, snmp4_net_list, tcp_cnt,
+					     net->mib.net_statistics);
+		for (i = 0; i < tcp_cnt; i++)
+			seq_printf(seq, " %lu", buff[i]);
+	} else {
+		for (i = 0; i < tcp_cnt; i++)
+			seq_printf(seq, " %lu",
+				   snmp_fold_field(net->mib.net_statistics,
+						   snmp4_net_list[i].entry));
+	}
+	seq_puts(seq, "\nIpExt:");
+	for (i = 0; i < ip_cnt; i++)
+		seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
+
+	seq_puts(seq, "\nIpExt:");
+	if (buff) {
+		u64 *buff64 = (u64 *)buff;
+
+		memset(buff64, 0, ip_cnt * sizeof(u64));
+		snmp_get_cpu_field64_batch_cnt(buff64, snmp4_ipextstats_list, ip_cnt,
+					   net->mib.ip_statistics,
+					   offsetof(struct ipstats_mib, syncp));
+		for (i = 0; i < ip_cnt; i++)
+			seq_printf(seq, " %llu", buff64[i]);
+	} else {
+		for (i = 0; i < ip_cnt; i++)
+			seq_printf(seq, " %llu",
+				   snmp_fold_field64(net->mib.ip_statistics,
+						     snmp4_ipextstats_list[i].entry,
+						     offsetof(struct ipstats_mib, syncp)));
+	}
+	kfree(buff);
+	seq_putc(seq, '\n');
+	mptcp_seq_show(seq);
+	return 0;
+}
+
+static __net_init int ip_proc_init_net(struct net *net)
+{
+	if (!proc_create_net_single("sockstat", 0444, net->proc_net,
+			sockstat_seq_show, NULL))
+		goto out_sockstat;
+	if (!proc_create_net_single("netstat", 0444, net->proc_net,
+			netstat_seq_show, NULL))
+		goto out_netstat;
+	if (!proc_create_net_single("snmp", 0444, net->proc_net, snmp_seq_show,
+			NULL))
+		goto out_snmp;
+
+	return 0;
+
+out_snmp:
+	remove_proc_entry("netstat", net->proc_net);
+out_netstat:
+	remove_proc_entry("sockstat", net->proc_net);
+out_sockstat:
+	return -ENOMEM;
+}
+
+static __net_exit void ip_proc_exit_net(struct net *net)
+{
+	remove_proc_entry("snmp", net->proc_net);
+	remove_proc_entry("netstat", net->proc_net);
+	remove_proc_entry("sockstat", net->proc_net);
+}
+
+static __net_initdata struct pernet_operations ip_proc_ops = {
+	.init = ip_proc_init_net,
+	.exit = ip_proc_exit_net,
+};
+
+int __init ip_misc_proc_init(void)
+{
+	return register_pernet_subsys(&ip_proc_ops);
+}