Merge tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Don't destroy user event fields when removal fails

   User event fields are destroyed before the event is removed from
   visibility. But that can fail leaving the still visible event with no
   fields. Move the destroying of the fields to after the event is
   successfully removed from visibility.

 - Initialize function graph state is fork before calling
   copy_exec_state()

   For non-CLONE_VM forks, copy_exec_state() allocates a new
   task_exec_state. If that allocation fails, ftrace_graph_exit_task()
   will free the tasks ret_stack pointer. Since that pointer is still
   using the parent's ret_stack, it mistakenly frees the parent's
   pointer too.

   Call ftrace_graph_init() on the task first which will NULL out the
   new tasks's ret_stack and if the copy fails, it will not free
   anything.

 - Remove FGRAPH_MAX_INDEX

   The macro FGRAPH_MAX_INDEX was added but never used. Remove it.

 - Save ent_size in function graph printing of nested functions

   The function graph tracer needs to look at the next event to see if
   the next event is the return of the current function entry. If it is,
   it prints a single line:

	ktime_get();

   Otherwise it prints it like a nested function:

	tick_nohz_irq_exit() {
	    ktime_get();
	    kcpustat_irq_exit();
	}

   In order to look at the next event, it must save the current event so
   that it has the information to print from it. It saves the event in
   the iterator descriptor called "ent". What it doesn't save is the
   ent_size of the event which is now used to know if the function graph
   arguments are to be printed. The peek doesn't save the size so the
   size used happens to be that of the size of the last event that was
   seen.

   Save the entry event size in the iterator descriptor so that the
   correct size is used.

 - Fix several errors with freeing data in the histogram code

   The histogram code had a lot of leaked or or incorrect accounting
   when failures happen. Correct them.

 - Fix histogram regression of .percent and .graph modifiers

   Up until 6.3 histogram values could have "percent" or "graph"
   modifiers that changed how they were printed. But a change that added
   restricting histograms values from being strings, stack traces and
   other modifiers inadvertently prevented them from using the percent
   and graph modifiers, which were legal use cases for values.

   Put back the percent and graph modifiers.

 - Fix various typos in the comments

 - Set the trace_clock before initializing a histogram with clock
   argument

   The histogram API allows the user to specific which trace clock to
   use via a "clock=" string. The histogram is set up first before the
   clock is checked. If the passed in clock is not valid, it exits
   without fully fixing up the histogram leaving it on the list and a
   use-after-free can trigger.

   Update the clock argument first and if it fails then exit gracefully
   before the histogram trigger is placed on any lists.

 - Restore :mod: trailer after parsing in ftrace_set_clr_event

   The function ftrace_set_clr_event() modifies the parse string and
   needs to put it back to what was passed in. It searches for ":mod:"
   via a strsep() but fails to put back the first ':' in the string.

   Add back the ':' in the passed in string.

 - Take trace_array reference when opening a tracer options file

   The options files are dynamically created and some tracers add their
   own options. When a tracer adds their own list of options, the
   trace_array holding them has an array to hold the list of options for
   each tracer. This array increases in size via a krealloc(), and the
   new entry gets a newly allocated array to hold the options of the new
   tracer being added.

   The element in each entry of the tracer's option array holds a
   pointer back to the trace_array, a pointer to the tracer it is
   associated to, a pointer to the flags of the option.

   The issue is that these arrays are freed when the trace_array is
   freed when its instance it represents is removed from the instances
   directory. There's a race that an open of one of these options files
   can happen when the instance is being removed.

   Add a new helper function to be called by the open function of the
   options file to iterate all existing trace_arrays under a lock and
   find the one that has the given option element in one of it's tracer
   arrays. If found, then update the associated trace_array's reference
   counter to keep it from being freed. If not found, have the open call
   return -ENODEV.

 - Disable interrupts when acquiring the lock in rb_wake_up_waiters()

   The function rb_wake_up_waiters() assumes it will be called in
   interrupt context and does not disable irqs when taking
   cpu_buffer->reader_lock, which can be called in hard interrupt
   context. The issue is in PREEMPT_RT, this function is called in
   thread context leaving this lock open to a deadlock.

   Take the lock with interrupts disabled.

 - Use rcu_assign_pointer() for tmp_ops filter hash

   The tmp_ops used in update_ftrace_direct_mod() assigns its
   filter_hash field directly, but that field is annotated as __rcu and
   sparse complains. Assign it with rcu_assign_pointer()

 - Fix use-after-free in enable_trigger_private_data_free()

   The trace_event_call is accessed through the event_trigger_data's
   trace_event_file pointer to put the trace_event_call on freeing. The
   issue is that the trace_event_file data may have been freed already
   causing a use-after-free. Add a field to the event_trigger_data that
   points directly to the trace_event_call so that it can decrement its
   reference directly without needing to go through the
   trace_event_file.

 - Fix accounting of buffer data remote headers

   trace_buffer_desc_size() and trace_remote_alloc_buffer() undercount
   the number of pages is needed for the asked for size as it doesn't
   take into account the meta data on each page. Add a helper function
   to do the calculation properly and use that in these functions.

 - Catch nr_page_va overflow in ring_buffer_desc sizing

   The number of pages per remote ring buffer is capped by
   ring_buffer_desc::nr_page_va (32 bits). A buffer_size large enough to
   overflow that field would silently allocate a descriptor smaller than
   what was asked for.

 - Do not resize the subbuf order if any per_cpu buffer is disabled

   The mmapping of ring buffers disables resizing the subbuffers, but it
   is done per-cpu whereas the subbuf size change is done for all the
   per_cpu buffers under the buffer->mutex. It could change the size of
   some while the mapping is happening on others. Have the resize of the
   subbuf order check all the per_cpu buffers under the lock to see if
   any of them is disabled before starting and causing an inconsistency
   between buffers that are being mapped.

* tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (25 commits)
  ring-buffer: Check resize_disabled before publishing the new subbuf order
  tracing/remotes: Catch nr_page_va overflow in ring_buffer_desc sizing
  tracing/remotes: Account for ring buffer page header in size calculation
  tracing: Don't dereference trace_event_file in deferred trigger free
  ftrace: Use rcu_assign_pointer() for tmp_ops filter hash
  ring-buffer: Acquire the lock with irqsave in rb_wake_up_waiters()
  tracing: Take trace_array reference when opening a tracer options file
  tracing: Fix ring_buffer_read_page_size() kernel-doc
  tracing: Restore :mod: trailer after parsing in ftrace_set_clr_event()
  tracing: Fix memory corruption from a "STACKTRACE" histogram key
  tracing: Fix memory corruption from the histogram stacktrace modifier
  tracing: Undo the registration when enabling the histogram trigger fails
  tracing: Take the reference before publishing the named histogram trigger
  tracing: Set the trace clock before registering the histogram trigger
  tracing: Fix typo "preceeded" in comment
  tracing: Fix typo "availabe" in comment
  tracing: Let histogram values keep the percent and graph modifiers
  tracing: Keep the entry count when the histogram stats allocation fails
  tracing: Free histogram the field rejected for a bad modifier
  tracing: Free histogram the var ref when its initialization fails
  ...

1 files changed, 1138 insertions, 0 deletions

diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
new file mode 100644
index 000000000..d756e5e31
--- /dev/null
+++ b/net/ipv4/raw.c
@@ -0,0 +1,1138 @@
+// 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.
+ *
+ *		RAW - implementation of IP "raw" sockets.
+ *
+ * Authors:	Ross Biro
+ *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *
+ * Fixes:
+ *		Alan Cox	:	verify_area() fixed up
+ *		Alan Cox	:	ICMP error handling
+ *		Alan Cox	:	EMSGSIZE if you send too big a packet
+ *		Alan Cox	: 	Now uses generic datagrams and shared
+ *					skbuff library. No more peek crashes,
+ *					no more backlogs
+ *		Alan Cox	:	Checks sk->broadcast.
+ *		Alan Cox	:	Uses skb_free_datagram/skb_copy_datagram
+ *		Alan Cox	:	Raw passes ip options too
+ *		Alan Cox	:	Setsocketopt added
+ *		Alan Cox	:	Fixed error return for broadcasts
+ *		Alan Cox	:	Removed wake_up calls
+ *		Alan Cox	:	Use ttl/tos
+ *		Alan Cox	:	Cleaned up old debugging
+ *		Alan Cox	:	Use new kernel side addresses
+ *	Arnt Gulbrandsen	:	Fixed MSG_DONTROUTE in raw sockets.
+ *		Alan Cox	:	BSD style RAW socket demultiplexing.
+ *		Alan Cox	:	Beginnings of mrouted support.
+ *		Alan Cox	:	Added IP_HDRINCL option.
+ *		Alan Cox	:	Skip broadcast check if BSDism set.
+ *		David S. Miller	:	New socket lookup architecture.
+ */
+
+#include <linux/types.h>
+#include <linux/atomic.h>
+#include <asm/byteorder.h>
+#include <asm/current.h>
+#include <linux/uaccess.h>
+#include <asm/ioctls.h>
+#include <linux/stddef.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/export.h>
+#include <linux/spinlock.h>
+#include <linux/sockios.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/mroute.h>
+#include <linux/netdevice.h>
+#include <linux/in_route.h>
+#include <linux/route.h>
+#include <linux/skbuff.h>
+#include <linux/igmp.h>
+#include <net/net_namespace.h>
+#include <net/dst.h>
+#include <net/sock.h>
+#include <linux/ip.h>
+#include <linux/net.h>
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/udp.h>
+#include <net/raw.h>
+#include <net/snmp.h>
+#include <net/tcp_states.h>
+#include <net/inet_common.h>
+#include <net/checksum.h>
+#include <net/xfrm.h>
+#include <linux/rtnetlink.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/compat.h>
+#include <linux/uio.h>
+
+struct raw_frag_vec {
+	struct msghdr *msg;
+	union {
+		struct icmphdr icmph;
+		char c[1];
+	} hdr;
+	int hlen;
+};
+
+struct raw_hashinfo raw_v4_hashinfo;
+EXPORT_SYMBOL_GPL(raw_v4_hashinfo);
+
+int raw_hash_sk(struct sock *sk)
+{
+	struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
+	struct hlist_head *hlist;
+
+	hlist = &h->ht[raw_hashfunc(sock_net(sk), inet_sk(sk)->inet_num)];
+
+	spin_lock(&h->lock);
+	sk_add_node_rcu(sk, hlist);
+	sock_set_flag(sk, SOCK_RCU_FREE);
+	spin_unlock(&h->lock);
+	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
+
+	return 0;
+}
+
+void raw_unhash_sk(struct sock *sk)
+{
+	struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
+
+	spin_lock(&h->lock);
+	if (sk_del_node_init_rcu(sk))
+		sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
+	spin_unlock(&h->lock);
+}
+
+bool raw_v4_match(struct net *net, const struct sock *sk, unsigned short num,
+		  __be32 raddr, __be32 laddr, int dif, int sdif)
+{
+	const struct inet_sock *inet = inet_sk(sk);
+	__be32 daddr, rcv_saddr;
+
+	if (!net_eq(sock_net(sk), net) || inet->inet_num != num)
+		return false;
+
+	daddr = READ_ONCE(inet->inet_daddr);
+	if (daddr && daddr != raddr)
+		return false;
+
+	rcv_saddr = READ_ONCE(inet->inet_rcv_saddr);
+	if (rcv_saddr && rcv_saddr != laddr)
+		return false;
+
+	return raw_sk_bound_dev_eq(net, READ_ONCE(sk->sk_bound_dev_if),
+				   dif, sdif);
+}
+EXPORT_SYMBOL_GPL(raw_v4_match);
+
+/*
+ *	0 - deliver
+ *	1 - block
+ */
+static int icmp_filter(const struct sock *sk, const struct sk_buff *skb)
+{
+	struct icmphdr _hdr;
+	const struct icmphdr *hdr;
+
+	hdr = skb_header_pointer(skb, skb_transport_offset(skb),
+				 sizeof(_hdr), &_hdr);
+	if (!hdr)
+		return 1;
+
+	if (hdr->type < 32) {
+		__u32 data = raw_sk(sk)->filter.data;
+
+		return ((1U << hdr->type) & data) != 0;
+	}
+
+	/* Do not block unknown ICMP types */
+	return 0;
+}
+
+/* IP input processing comes here for RAW socket delivery.
+ * Caller owns SKB, so we must make clones.
+ *
+ * RFC 1122: SHOULD pass TOS value up to the transport layer.
+ * -> It does. And not only TOS, but all IP header.
+ */
+static int raw_v4_input(struct net *net, struct sk_buff *skb,
+			const struct iphdr *iph, int hash)
+{
+	int sdif = inet_sdif(skb);
+	struct hlist_head *hlist;
+	int dif = inet_iif(skb);
+	int delivered = 0;
+	struct sock *sk;
+
+	hlist = &raw_v4_hashinfo.ht[hash];
+	rcu_read_lock();
+	sk_for_each_rcu(sk, hlist) {
+		if (!raw_v4_match(net, sk, iph->protocol,
+				  iph->saddr, iph->daddr, dif, sdif))
+			continue;
+
+		if (atomic_read(&sk->sk_rmem_alloc) >=
+		    READ_ONCE(sk->sk_rcvbuf)) {
+			sk_drops_inc(sk);
+			continue;
+		}
+
+		delivered = 1;
+		if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) &&
+		    ip_mc_sf_allow(sk, iph->daddr, iph->saddr,
+				   skb->dev->ifindex, sdif)) {
+			struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
+
+			/* Not releasing hash table! */
+			if (clone)
+				raw_rcv(sk, clone);
+		}
+	}
+	rcu_read_unlock();
+	return delivered;
+}
+
+int raw_local_deliver(struct sk_buff *skb, int protocol)
+{
+	struct net *net = dev_net(skb->dev);
+
+	return raw_v4_input(net, skb, ip_hdr(skb),
+			    raw_hashfunc(net, protocol));
+}
+
+static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
+{
+	struct inet_sock *inet = inet_sk(sk);
+	const int type = icmp_hdr(skb)->type;
+	const int code = icmp_hdr(skb)->code;
+	int harderr = 0;
+	bool recverr;
+	int err = 0;
+
+	if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
+		ipv4_sk_update_pmtu(skb, sk, info);
+	else if (type == ICMP_REDIRECT) {
+		ipv4_sk_redirect(skb, sk);
+		return;
+	}
+
+	/* Report error on raw socket, if:
+	   1. User requested ip_recverr.
+	   2. Socket is connected (otherwise the error indication
+	      is useless without ip_recverr and error is hard.
+	 */
+	recverr = inet_test_bit(RECVERR, sk);
+	if (!recverr && sk->sk_state != TCP_ESTABLISHED)
+		return;
+
+	switch (type) {
+	default:
+	case ICMP_TIME_EXCEEDED:
+		err = EHOSTUNREACH;
+		break;
+	case ICMP_SOURCE_QUENCH:
+		return;
+	case ICMP_PARAMETERPROB:
+		err = EPROTO;
+		harderr = 1;
+		break;
+	case ICMP_DEST_UNREACH:
+		err = EHOSTUNREACH;
+		if (code > NR_ICMP_UNREACH)
+			break;
+		if (code == ICMP_FRAG_NEEDED) {
+			harderr = READ_ONCE(inet->pmtudisc) != IP_PMTUDISC_DONT;
+			err = EMSGSIZE;
+		} else {
+			err = icmp_err_convert[code].errno;
+			harderr = icmp_err_convert[code].fatal;
+		}
+	}
+
+	if (recverr) {
+		const struct iphdr *iph = (const struct iphdr *)skb->data;
+		u8 *payload = skb->data + (iph->ihl << 2);
+
+		if (inet_test_bit(HDRINCL, sk))
+			payload = skb->data;
+		ip_icmp_error(sk, skb, err, 0, info, payload);
+	}
+
+	if (recverr || harderr) {
+		sk->sk_err = err;
+		sk_error_report(sk);
+	}
+}
+
+void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
+{
+	struct net *net = dev_net(skb->dev);
+	int dif = skb->dev->ifindex;
+	int sdif = inet_sdif(skb);
+	struct hlist_head *hlist;
+	const struct iphdr *iph;
+	struct sock *sk;
+	int hash;
+
+	hash = raw_hashfunc(net, protocol);
+	hlist = &raw_v4_hashinfo.ht[hash];
+
+	rcu_read_lock();
+	sk_for_each_rcu(sk, hlist) {
+		iph = (const struct iphdr *)skb->data;
+		if (!raw_v4_match(net, sk, iph->protocol,
+				  iph->daddr, iph->saddr, dif, sdif))
+			continue;
+		raw_err(sk, skb, info);
+	}
+	rcu_read_unlock();
+}
+
+static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
+{
+	enum skb_drop_reason reason;
+
+	/* Charge it to the socket. */
+
+	ipv4_pktinfo_prepare(sk, skb, true);
+	reason = sock_queue_rcv_skb_reason(sk, skb);
+	if (reason) {
+		sk_skb_reason_drop(sk, skb, reason);
+		return NET_RX_DROP;
+	}
+
+	return NET_RX_SUCCESS;
+}
+
+int raw_rcv(struct sock *sk, struct sk_buff *skb)
+{
+	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
+		sk_drops_inc(sk);
+		sk_skb_reason_drop(sk, skb, SKB_DROP_REASON_XFRM_POLICY);
+		return NET_RX_DROP;
+	}
+	nf_reset_ct(skb);
+
+	skb_push(skb, -skb_network_offset(skb));
+
+	raw_rcv_skb(sk, skb);
+	return 0;
+}
+
+static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
+			   struct msghdr *msg, size_t length,
+			   struct rtable **rtp, unsigned int flags,
+			   const struct sockcm_cookie *sockc)
+{
+	struct inet_sock *inet = inet_sk(sk);
+	struct net *net = sock_net(sk);
+	struct iphdr *iph;
+	struct sk_buff *skb;
+	unsigned int iphlen;
+	int err;
+	struct rtable *rt = *rtp;
+	int hlen, tlen;
+
+	if (length > rt->dst.dev->mtu) {
+		ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
+			       rt->dst.dev->mtu);
+		return -EMSGSIZE;
+	}
+	if (length < sizeof(struct iphdr))
+		return -EINVAL;
+
+	if (flags&MSG_PROBE)
+		goto out;
+
+	hlen = LL_RESERVED_SPACE(rt->dst.dev);
+	tlen = rt->dst.dev->needed_tailroom;
+	skb = sock_alloc_send_skb(sk,
+				  length + hlen + tlen + 15,
+				  flags & MSG_DONTWAIT, &err);
+	if (!skb)
+		goto error;
+	skb_reserve(skb, hlen);
+
+	skb->protocol = htons(ETH_P_IP);
+	skb->priority = sockc->priority;
+	skb->mark = sockc->mark;
+	skb_set_delivery_type_by_clockid(skb, sockc->transmit_time, sk->sk_clockid);
+	skb_dst_set(skb, &rt->dst);
+	*rtp = NULL;
+
+	skb_reset_network_header(skb);
+	iph = ip_hdr(skb);
+	skb_put(skb, length);
+
+	skb->ip_summed = CHECKSUM_NONE;
+
+	skb_setup_tx_timestamp(skb, sockc);
+
+	if (flags & MSG_CONFIRM)
+		skb_set_dst_pending_confirm(skb, 1);
+
+	skb->transport_header = skb->network_header;
+	err = -EFAULT;
+	if (memcpy_from_msg(iph, msg, length))
+		goto error_free;
+
+	iphlen = iph->ihl * 4;
+
+	/*
+	 * We don't want to modify the ip header, but we do need to
+	 * be sure that it won't cause problems later along the network
+	 * stack.  Specifically we want to make sure that iph->ihl is a
+	 * sane value.  If ihl points beyond the length of the buffer passed
+	 * in, reject the frame as invalid
+	 */
+	err = -EINVAL;
+	if (iphlen > length || iphlen < sizeof(*iph))
+		goto error_free;
+
+	if (iphlen >= sizeof(*iph)) {
+		if (!iph->saddr)
+			iph->saddr = fl4->saddr;
+		iph->check   = 0;
+		iph->tot_len = htons(length);
+		if (!iph->id)
+			ip_select_ident(net, skb, NULL);
+
+		iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
+		skb->transport_header += iphlen;
+		if (iph->protocol == IPPROTO_ICMP &&
+		    length >= iphlen + sizeof(struct icmphdr))
+			icmp_out_count(net, ((struct icmphdr *)
+				skb_transport_header(skb))->type);
+	}
+
+	err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT,
+		      net, sk, skb, NULL, rt->dst.dev,
+		      dst_output);
+	if (err > 0)
+		err = net_xmit_errno(err);
+	if (err)
+		goto error;
+out:
+	return 0;
+
+error_free:
+	kfree_skb(skb);
+error:
+	IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
+	if (err == -ENOBUFS && !inet_test_bit(RECVERR, sk))
+		err = 0;
+	return err;
+}
+
+static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4)
+{
+	int err;
+
+	if (fl4->flowi4_proto != IPPROTO_ICMP)
+		return 0;
+
+	/* We only need the first two bytes. */
+	rfv->hlen = 2;
+
+	err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen);
+	if (err)
+		return err;
+
+	fl4->fl4_icmp_type = rfv->hdr.icmph.type;
+	fl4->fl4_icmp_code = rfv->hdr.icmph.code;
+
+	return 0;
+}
+
+static int raw_getfrag(void *from, char *to, int offset, int len, int odd,
+		       struct sk_buff *skb)
+{
+	struct raw_frag_vec *rfv = from;
+
+	if (offset < rfv->hlen) {
+		int copy = min(rfv->hlen - offset, len);
+
+		if (skb->ip_summed == CHECKSUM_PARTIAL)
+			memcpy(to, rfv->hdr.c + offset, copy);
+		else
+			skb->csum = csum_block_add(
+				skb->csum,
+				csum_partial_copy_nocheck(rfv->hdr.c + offset,
+							  to, copy),
+				odd);
+
+		odd = 0;
+		offset += copy;
+		to += copy;
+		len -= copy;
+
+		if (!len)
+			return 0;
+	}
+
+	offset -= rfv->hlen;
+
+	return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
+}
+
+static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
+{
+	DEFINE_RAW_FLEX(struct ip_options_rcu, opt_copy, opt.__data,
+			IP_OPTIONS_DATA_FIXED_SIZE);
+	struct inet_sock *inet = inet_sk(sk);
+	struct net *net = sock_net(sk);
+	struct ipcm_cookie ipc;
+	struct rtable *rt = NULL;
+	struct flowi4 fl4;
+	u8 scope;
+	int free = 0;
+	__be32 daddr;
+	__be32 saddr;
+	int uc_index, err;
+	struct raw_frag_vec rfv;
+	int hdrincl;
+
+	err = -EMSGSIZE;
+	if (len > 0xFFFF)
+		goto out;
+
+	hdrincl = inet_test_bit(HDRINCL, sk);
+
+	/*
+	 *	Check the flags.
+	 */
+
+	err = -EOPNOTSUPP;
+	if (msg->msg_flags & MSG_OOB)	/* Mirror BSD error message */
+		goto out;               /* compatibility */
+
+	/*
+	 *	Get and verify the address.
+	 */
+
+	if (msg->msg_namelen) {
+		DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
+		err = -EINVAL;
+		if (msg->msg_namelen < sizeof(*usin))
+			goto out;
+		if (usin->sin_family != AF_INET) {
+			pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n",
+				     __func__, current->comm);
+			err = -EAFNOSUPPORT;
+			if (usin->sin_family)
+				goto out;
+		}
+		daddr = usin->sin_addr.s_addr;
+		/* ANK: I did not forget to get protocol from port field.
+		 * I just do not know, who uses this weirdness.
+		 * IP_HDRINCL is much more convenient.
+		 */
+	} else {
+		err = -EDESTADDRREQ;
+		if (sk->sk_state != TCP_ESTABLISHED)
+			goto out;
+		daddr = inet->inet_daddr;
+	}
+
+	ipcm_init_sk(&ipc, inet);
+	/* Keep backward compat */
+	if (hdrincl)
+		ipc.protocol = IPPROTO_RAW;
+
+	if (msg->msg_controllen) {
+		err = ip_cmsg_send(sk, msg, &ipc, false);
+		if (unlikely(err)) {
+			kfree(ipc.opt);
+			goto out;
+		}
+		if (ipc.opt)
+			free = 1;
+	}
+
+	saddr = ipc.addr;
+	ipc.addr = daddr;
+
+	if (!ipc.opt) {
+		struct ip_options_rcu *inet_opt;
+
+		rcu_read_lock();
+		inet_opt = rcu_dereference(inet->inet_opt);
+		if (inet_opt) {
+			memcpy(opt_copy, inet_opt,
+			       sizeof(*inet_opt) + inet_opt->opt.optlen);
+			ipc.opt = opt_copy;
+		}
+		rcu_read_unlock();
+	}
+
+	if (ipc.opt) {
+		err = -EINVAL;
+		/* Linux does not mangle headers on raw sockets,
+		 * so that IP options + IP_HDRINCL is non-sense.
+		 */
+		if (hdrincl)
+			goto done;
+		if (ipc.opt->opt.srr) {
+			if (!daddr)
+				goto done;
+			daddr = ipc.opt->opt.faddr;
+		}
+	}
+	scope = ip_sendmsg_scope(inet, &ipc, msg);
+
+	uc_index = READ_ONCE(inet->uc_index);
+	if (ipv4_is_multicast(daddr)) {
+		if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif))
+			ipc.oif = READ_ONCE(inet->mc_index);
+		if (!saddr)
+			saddr = READ_ONCE(inet->mc_addr);
+	} else if (!ipc.oif) {
+		ipc.oif = uc_index;
+	} else if (ipv4_is_lbcast(daddr) && uc_index) {
+		/* oif is set, packet is to local broadcast
+		 * and uc_index is set. oif is most likely set
+		 * by sk_bound_dev_if. If uc_index != oif check if the
+		 * oif is an L3 master and uc_index is an L3 slave.
+		 * If so, we want to allow the send using the uc_index.
+		 */
+		if (ipc.oif != uc_index &&
+		    ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk),
+							      uc_index)) {
+			ipc.oif = uc_index;
+		}
+	}
+
+	flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark,
+			   ipc.tos & INET_DSCP_MASK, scope,
+			   hdrincl ? ipc.protocol : sk->sk_protocol,
+			   inet_sk_flowi_flags(sk) |
+			    (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0),
+			   daddr, saddr, 0, 0, sk_uid(sk));
+
+	fl4.fl4_icmp_type = 0;
+	fl4.fl4_icmp_code = 0;
+
+	if (!hdrincl) {
+		rfv.msg = msg;
+		rfv.hlen = 0;
+
+		err = raw_probe_proto_opt(&rfv, &fl4);
+		if (err)
+			goto done;
+	}
+
+	security_sk_classify_flow(sk, flowi4_to_flowi_common(&fl4));
+	rt = ip_route_output_flow(net, &fl4, sk);
+	if (IS_ERR(rt)) {
+		err = PTR_ERR(rt);
+		rt = NULL;
+		goto done;
+	}
+
+	err = -EACCES;
+	if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
+		goto done;
+
+	if (msg->msg_flags & MSG_CONFIRM)
+		goto do_confirm;
+back_from_confirm:
+
+	if (hdrincl)
+		err = raw_send_hdrinc(sk, &fl4, msg, len,
+				      &rt, msg->msg_flags, &ipc.sockc);
+
+	 else {
+		if (!ipc.addr)
+			ipc.addr = fl4.daddr;
+		lock_sock(sk);
+		err = ip_append_data(sk, &fl4, raw_getfrag,
+				     &rfv, len, 0,
+				     &ipc, &rt, msg->msg_flags);
+		if (err)
+			ip_flush_pending_frames(sk);
+		else if (!(msg->msg_flags & MSG_MORE)) {
+			err = ip_push_pending_frames(sk, &fl4);
+			if (err == -ENOBUFS && !inet_test_bit(RECVERR, sk))
+				err = 0;
+		}
+		release_sock(sk);
+	}
+done:
+	if (free)
+		kfree(ipc.opt);
+	ip_rt_put(rt);
+
+out:
+	if (err < 0)
+		return err;
+	return len;
+
+do_confirm:
+	if (msg->msg_flags & MSG_PROBE)
+		dst_confirm_neigh(&rt->dst, &fl4.daddr);
+	if (!(msg->msg_flags & MSG_PROBE) || len)
+		goto back_from_confirm;
+	err = 0;
+	goto done;
+}
+
+static void raw_close(struct sock *sk, long timeout)
+{
+	/*
+	 * Raw sockets may have direct kernel references. Kill them.
+	 */
+	ip_ra_control(sk, 0, NULL);
+
+	sk_common_release(sk);
+}
+
+static void raw_destroy(struct sock *sk)
+{
+	lock_sock(sk);
+	ip_flush_pending_frames(sk);
+	release_sock(sk);
+}
+
+/* This gets rid of all the nasties in af_inet. -DaveM */
+static int raw_bind(struct sock *sk, struct sockaddr_unsized *uaddr,
+		    int addr_len)
+{
+	struct inet_sock *inet = inet_sk(sk);
+	struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
+	struct net *net = sock_net(sk);
+	u32 tb_id = RT_TABLE_LOCAL;
+	int ret = -EINVAL;
+	int chk_addr_ret;
+
+	lock_sock(sk);
+	if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
+		goto out;
+
+	if (sk->sk_bound_dev_if)
+		tb_id = l3mdev_fib_table_by_index(net,
+						  sk->sk_bound_dev_if) ? : tb_id;
+
+	chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
+
+	ret = -EADDRNOTAVAIL;
+	if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr,
+					 chk_addr_ret))
+		goto out;
+
+	inet->inet_saddr = addr->sin_addr.s_addr;
+	WRITE_ONCE(inet->inet_rcv_saddr, addr->sin_addr.s_addr);
+	if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
+		inet->inet_saddr = 0;  /* Use device */
+	sk_dst_reset(sk);
+	ret = 0;
+out:
+	release_sock(sk);
+	return ret;
+}
+
+/*
+ *	This should be easy, if there is something there
+ *	we return it, otherwise we block.
+ */
+
+static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
+		       int flags)
+{
+	struct inet_sock *inet = inet_sk(sk);
+	size_t copied = 0;
+	int err = -EOPNOTSUPP;
+	DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
+	struct sk_buff *skb;
+
+	if (flags & MSG_OOB)
+		goto out;
+
+	if (flags & MSG_ERRQUEUE) {
+		err = ip_recv_error(sk, msg, len);
+		goto out;
+	}
+
+	skb = skb_recv_datagram(sk, flags, &err);
+	if (!skb)
+		goto out;
+
+	copied = skb->len;
+	if (len < copied) {
+		msg->msg_flags |= MSG_TRUNC;
+		copied = len;
+	}
+
+	err = skb_copy_datagram_msg(skb, 0, msg, copied);
+	if (err)
+		goto done;
+
+	sock_recv_cmsgs(msg, sk, skb);
+
+	/* Copy the address. */
+	if (sin) {
+		sin->sin_family = AF_INET;
+		sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
+		sin->sin_port = 0;
+		memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
+		msg->msg_namelen = sizeof(*sin);
+	}
+	if (inet_cmsg_flags(inet))
+		ip_cmsg_recv(msg, skb);
+	if (flags & MSG_TRUNC)
+		copied = skb->len;
+done:
+	skb_free_datagram(sk, skb);
+out:
+	if (err)
+		return err;
+	return copied;
+}
+
+static int raw_sk_init(struct sock *sk)
+{
+	struct raw_sock *rp = raw_sk(sk);
+
+	sk->sk_drop_counters = &rp->drop_counters;
+	if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
+		memset(&rp->filter, 0, sizeof(rp->filter));
+	return 0;
+}
+
+static int raw_seticmpfilter(struct sock *sk, sockptr_t optval, int optlen)
+{
+	if (optlen > sizeof(struct icmp_filter))
+		optlen = sizeof(struct icmp_filter);
+	if (copy_from_sockptr(&raw_sk(sk)->filter, optval, optlen))
+		return -EFAULT;
+	return 0;
+}
+
+static int raw_geticmpfilter(struct sock *sk, sockopt_t *opt)
+{
+	int len = opt->optlen;
+
+	if (len < 0)
+		return -EINVAL;
+	if (len > sizeof(struct icmp_filter))
+		len = sizeof(struct icmp_filter);
+	opt->optlen = len;
+	if (copy_to_iter(&raw_sk(sk)->filter, len, &opt->iter_out) != len)
+		return -EFAULT;
+	return 0;
+}
+
+static int do_raw_setsockopt(struct sock *sk, int optname,
+			     sockptr_t optval, unsigned int optlen)
+{
+	if (optname == ICMP_FILTER) {
+		if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
+			return -EOPNOTSUPP;
+		else
+			return raw_seticmpfilter(sk, optval, optlen);
+	}
+	return -ENOPROTOOPT;
+}
+
+static int raw_setsockopt(struct sock *sk, int level, int optname,
+			  sockptr_t optval, unsigned int optlen)
+{
+	if (level != SOL_RAW)
+		return ip_setsockopt(sk, level, optname, optval, optlen);
+	return do_raw_setsockopt(sk, optname, optval, optlen);
+}
+
+static int do_raw_getsockopt(struct sock *sk, int optname, sockopt_t *opt)
+{
+	if (optname == ICMP_FILTER) {
+		if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
+			return -EOPNOTSUPP;
+		else
+			return raw_geticmpfilter(sk, opt);
+	}
+	return -ENOPROTOOPT;
+}
+
+static int raw_getsockopt(struct sock *sk, int level, int optname,
+			  char __user *optval, int __user *optlen)
+{
+	sockopt_t opt;
+	int err;
+
+	if (level != SOL_RAW)
+		return ip_getsockopt(sk, level, optname, optval, optlen);
+
+	err = sockopt_init_user(&opt, optval, optlen);
+	if (err)
+		return err;
+
+	err = do_raw_getsockopt(sk, optname, &opt);
+	if (err)
+		return err;
+
+	if (put_user(opt.optlen, optlen))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int raw_ioctl(struct sock *sk, int cmd, int *karg)
+{
+	switch (cmd) {
+	case SIOCOUTQ: {
+		*karg = sk_wmem_alloc_get(sk);
+		return 0;
+	}
+	case SIOCINQ: {
+		struct sk_buff *skb;
+
+		spin_lock_bh(&sk->sk_receive_queue.lock);
+		skb = skb_peek(&sk->sk_receive_queue);
+		if (skb)
+			*karg = skb->len;
+		else
+			*karg = 0;
+		spin_unlock_bh(&sk->sk_receive_queue.lock);
+		return 0;
+	}
+
+	default:
+#ifdef CONFIG_IP_MROUTE
+		return ipmr_ioctl(sk, cmd, karg);
+#else
+		return -ENOIOCTLCMD;
+#endif
+	}
+}
+
+#ifdef CONFIG_COMPAT
+static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case SIOCOUTQ:
+	case SIOCINQ:
+		return -ENOIOCTLCMD;
+	default:
+#ifdef CONFIG_IP_MROUTE
+		return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
+#else
+		return -ENOIOCTLCMD;
+#endif
+	}
+}
+#endif
+
+int raw_abort(struct sock *sk, int err)
+{
+	lock_sock(sk);
+
+	sk->sk_err = err;
+	sk_error_report(sk);
+	__udp_disconnect(sk, 0);
+
+	release_sock(sk);
+
+	return 0;
+}
+
+struct proto raw_prot = {
+	.name		   = "RAW",
+	.owner		   = THIS_MODULE,
+	.close		   = raw_close,
+	.destroy	   = raw_destroy,
+	.connect	   = ip4_datagram_connect,
+	.disconnect	   = __udp_disconnect,
+	.ioctl		   = raw_ioctl,
+	.init		   = raw_sk_init,
+	.setsockopt	   = raw_setsockopt,
+	.getsockopt	   = raw_getsockopt,
+	.sendmsg	   = raw_sendmsg,
+	.recvmsg	   = raw_recvmsg,
+	.bind		   = raw_bind,
+	.backlog_rcv	   = raw_rcv_skb,
+	.release_cb	   = ip4_datagram_release_cb,
+	.hash		   = raw_hash_sk,
+	.unhash		   = raw_unhash_sk,
+	.obj_size	   = sizeof(struct raw_sock),
+	.useroffset	   = offsetof(struct raw_sock, filter),
+	.usersize	   = sizeof_field(struct raw_sock, filter),
+	.h.raw_hash	   = &raw_v4_hashinfo,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	   = compat_raw_ioctl,
+#endif
+	.diag_destroy	   = raw_abort,
+};
+
+#ifdef CONFIG_PROC_FS
+static struct sock *raw_get_first(struct seq_file *seq, int bucket)
+{
+	struct raw_hashinfo *h = pde_data(file_inode(seq->file));
+	struct raw_iter_state *state = raw_seq_private(seq);
+	struct hlist_head *hlist;
+	struct sock *sk;
+
+	for (state->bucket = bucket; state->bucket < RAW_HTABLE_SIZE;
+			++state->bucket) {
+		hlist = &h->ht[state->bucket];
+		sk_for_each(sk, hlist) {
+			if (sock_net(sk) == seq_file_net(seq))
+				return sk;
+		}
+	}
+	return NULL;
+}
+
+static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
+{
+	struct raw_iter_state *state = raw_seq_private(seq);
+
+	do {
+		sk = sk_next(sk);
+	} while (sk && sock_net(sk) != seq_file_net(seq));
+
+	if (!sk)
+		return raw_get_first(seq, state->bucket + 1);
+	return sk;
+}
+
+static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
+{
+	struct sock *sk = raw_get_first(seq, 0);
+
+	if (sk)
+		while (pos && (sk = raw_get_next(seq, sk)) != NULL)
+			--pos;
+	return pos ? NULL : sk;
+}
+
+void *raw_seq_start(struct seq_file *seq, loff_t *pos)
+	__acquires(&h->lock)
+{
+	struct raw_hashinfo *h = pde_data(file_inode(seq->file));
+
+	spin_lock(&h->lock);
+
+	return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
+}
+
+void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	struct sock *sk;
+
+	if (v == SEQ_START_TOKEN)
+		sk = raw_get_first(seq, 0);
+	else
+		sk = raw_get_next(seq, v);
+	++*pos;
+	return sk;
+}
+
+void raw_seq_stop(struct seq_file *seq, void *v)
+	__releases(&h->lock)
+{
+	struct raw_hashinfo *h = pde_data(file_inode(seq->file));
+
+	spin_unlock(&h->lock);
+}
+
+static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
+{
+	struct inet_sock *inet = inet_sk(sp);
+	__be32 dest = inet->inet_daddr,
+	       src = inet->inet_rcv_saddr;
+	__u16 destp = 0,
+	      srcp  = inet->inet_num;
+
+	seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
+		" %02X %08X:%08X %02X:%08lX %08X %5u %8d %llu %d %pK %u\n",
+		i, src, srcp, dest, destp, sp->sk_state,
+		sk_wmem_alloc_get(sp),
+		sk_rmem_alloc_get(sp),
+		0, 0L, 0,
+		from_kuid_munged(seq_user_ns(seq), sk_uid(sp)),
+		0, sock_i_ino(sp),
+		refcount_read(&sp->sk_refcnt), sp, sk_drops_read(sp));
+}
+
+static int raw_seq_show(struct seq_file *seq, void *v)
+{
+	if (v == SEQ_START_TOKEN)
+		seq_printf(seq, "  sl  local_address rem_address   st tx_queue "
+				"rx_queue tr tm->when retrnsmt   uid  timeout "
+				"inode ref pointer drops\n");
+	else
+		raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
+	return 0;
+}
+
+static const struct seq_operations raw_seq_ops = {
+	.start = raw_seq_start,
+	.next  = raw_seq_next,
+	.stop  = raw_seq_stop,
+	.show  = raw_seq_show,
+};
+
+static __net_init int raw_init_net(struct net *net)
+{
+	if (!proc_create_net_data("raw", 0444, net->proc_net, &raw_seq_ops,
+			sizeof(struct raw_iter_state), &raw_v4_hashinfo))
+		return -ENOMEM;
+
+	return 0;
+}
+
+static __net_exit void raw_exit_net(struct net *net)
+{
+	remove_proc_entry("raw", net->proc_net);
+}
+
+static __net_initdata struct pernet_operations raw_net_ops = {
+	.init = raw_init_net,
+	.exit = raw_exit_net,
+};
+
+int __init raw_proc_init(void)
+{
+
+	return register_pernet_subsys(&raw_net_ops);
+}
+
+void __init raw_proc_exit(void)
+{
+	unregister_pernet_subsys(&raw_net_ops);
+}
+#endif /* CONFIG_PROC_FS */
+
+static void raw_sysctl_init_net(struct net *net)
+{
+#ifdef CONFIG_NET_L3_MASTER_DEV
+	net->ipv4.sysctl_raw_l3mdev_accept = 1;
+#endif
+}
+
+static int __net_init raw_sysctl_init(struct net *net)
+{
+	raw_sysctl_init_net(net);
+	return 0;
+}
+
+static struct pernet_operations __net_initdata raw_sysctl_ops = {
+	.init	= raw_sysctl_init,
+};
+
+void __init raw_init(void)
+{
+	raw_sysctl_init_net(&init_net);
+	if (register_pernet_subsys(&raw_sysctl_ops))
+		panic("RAW: failed to init sysctl parameters.\n");
+}