Release 4.11 net/ipv4/ip_sockglue.c

/*
 * 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.
 *
 *              The IP to API glue.
 *
 * Authors:     see ip.c
 *
 * Fixes:
 *              Many            :       Split from ip.c , see ip.c for history.
 *              Martin Mares    :       TOS setting fixed.
 *              Alan Cox        :       Fixed a couple of oopses in Martin's
 *                                      TOS tweaks.
 *              Mike McLagan    :       Routing by source
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/icmp.h>
#include <linux/inetdevice.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/tcp_states.h>
#include <linux/udp.h>
#include <linux/igmp.h>
#include <linux/netfilter.h>
#include <linux/route.h>
#include <linux/mroute.h>
#include <net/inet_ecn.h>
#include <net/route.h>
#include <net/xfrm.h>
#include <net/compat.h>
#include <net/checksum.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <net/transp_v6.h>
#endif
#include <net/ip_fib.h>

#include <linux/errqueue.h>
#include <linux/uaccess.h>

/*
 *      SOL_IP control messages.
 */



static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
{
	struct in_pktinfo info = *PKTINFO_SKB_CB(skb);

	info.ipi_addr.s_addr = ip_hdr(skb)->daddr;

	put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
}

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4
7.14%
2
28.57%
Arnaldo Carvalho de Melo
3
5.36%
1
14.29%
Total
56
100.00%
7
100.00%



static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
{
	int ttl = ip_hdr(skb)->ttl;
	put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
}

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43
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5
100.00%



static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
{
	put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
}

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8.57%
1
25.00%
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35
100.00%
4
100.00%



static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
{
	if (IPCB(skb)->opt.optlen == 0)
		return;

	put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
		 ip_hdr(skb) + 1);
}


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1
33.33%
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55
100.00%
3
100.00%



static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
{
	unsigned char optbuf[sizeof(struct ip_options) + 40];
	struct ip_options *opt = (struct ip_options *)optbuf;

	if (IPCB(skb)->opt.optlen == 0)
		return;

	if (ip_options_echo(opt, skb)) {
		msg->msg_flags |= MSG_CTRUNC;
		return;
	}
	ip_options_undo(opt);

	put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
}

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1
1.05%
1
33.33%
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95
100.00%
3
100.00%



static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb)
{
	int val;

	if (IPCB(skb)->frag_max_size == 0)
		return;

	val = IPCB(skb)->frag_max_size;
	put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val);
}

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static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
				  int tlen, int offset)
{
	__wsum csum = skb->csum;

	if (skb->ip_summed != CHECKSUM_COMPLETE)
		return;

	if (offset != 0) {
		int tend_off = skb_transport_offset(skb) + tlen;
		csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0));
	}

	put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
}

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Paolo Abeni
15
16.48%
1
25.00%
Eric Dumazet
3
3.30%
1
25.00%
Willem de Bruijn
1
1.10%
1
25.00%
Total
91
100.00%
4
100.00%



static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
{
	char *secdata;
	u32 seclen, secid;
	int err;

	err = security_socket_getpeersec_dgram(NULL, skb, &secid);
	if (err)
		return;

	err = security_secid_to_secctx(secid, &secdata, &seclen);
	if (err)
		return;

	put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
	security_release_secctx(secdata, seclen);
}

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static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
{
	struct sockaddr_in sin;
	const struct iphdr *iph = ip_hdr(skb);
	__be16 *ports = (__be16 *)skb_transport_header(skb);

	if (skb_transport_offset(skb) + 4 > (int)skb->len)
		return;

	/* All current transport protocols have the port numbers in the
         * first four bytes of the transport header and this function is
         * written with this assumption in mind.
         */

	sin.sin_family = AF_INET;
	sin.sin_addr.s_addr = iph->daddr;
	sin.sin_port = ports[1];
	memset(sin.sin_zero, 0, sizeof(sin.sin_zero));

	put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
}

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1
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Harvey Harrison
3
2.50%
1
25.00%
Eric Dumazet
1
0.83%
1
25.00%
Total
120
100.00%
4
100.00%



void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
			 struct sk_buff *skb, int tlen, int offset)
{
	struct inet_sock *inet = inet_sk(sk);
	unsigned int flags = inet->cmsg_flags;

	/* Ordered by supposed usage frequency */
	if (flags & IP_CMSG_PKTINFO) {
		ip_cmsg_recv_pktinfo(msg, skb);

		flags &= ~IP_CMSG_PKTINFO;
		if (!flags)
			return;
	}

	if (flags & IP_CMSG_TTL) {
		ip_cmsg_recv_ttl(msg, skb);

		flags &= ~IP_CMSG_TTL;
		if (!flags)
			return;
	}

	if (flags & IP_CMSG_TOS) {
		ip_cmsg_recv_tos(msg, skb);

		flags &= ~IP_CMSG_TOS;
		if (!flags)
			return;
	}

	if (flags & IP_CMSG_RECVOPTS) {
		ip_cmsg_recv_opts(msg, skb);

		flags &= ~IP_CMSG_RECVOPTS;
		if (!flags)
			return;
	}

	if (flags & IP_CMSG_RETOPTS) {
		ip_cmsg_recv_retopts(msg, skb);

		flags &= ~IP_CMSG_RETOPTS;
		if (!flags)
			return;
	}

	if (flags & IP_CMSG_PASSSEC) {
		ip_cmsg_recv_security(msg, skb);

		flags &= ~IP_CMSG_PASSSEC;
		if (!flags)
			return;
	}

	if (flags & IP_CMSG_ORIGDSTADDR) {
		ip_cmsg_recv_dstaddr(msg, skb);

		flags &= ~IP_CMSG_ORIGDSTADDR;
		if (!flags)
			return;
	}

	if (flags & IP_CMSG_CHECKSUM)
		ip_cmsg_recv_checksum(msg, skb, tlen, offset);

	if (flags & IP_CMSG_RECVFRAGSIZE)
		ip_cmsg_recv_fragsize(msg, skb);
}
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87
33.85%
3
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Catherine Zhang
17
6.61%
1
6.67%
Balazs Scheidler
17
6.61%
1
6.67%
Willem de Bruijn
13
5.06%
1
6.67%
David S. Miller
11
4.28%
1
6.67%
Eric Dumazet
6
2.33%
2
13.33%
Paolo Abeni
5
1.95%
1
6.67%
Arnaldo Carvalho de Melo
1
0.39%
1
6.67%
Total
257
100.00%
15
100.00%


EXPORT_SYMBOL(ip_cmsg_recv_offset);



int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc,
		 bool allow_ipv6)
{
	int err, val;
	struct cmsghdr *cmsg;
	struct net *net = sock_net(sk);

	for_each_cmsghdr(cmsg, msg) {
		if (!CMSG_OK(msg, cmsg))
			return -EINVAL;
#if IS_ENABLED(CONFIG_IPV6)
		if (allow_ipv6 &&
		    cmsg->cmsg_level == SOL_IPV6 &&
		    cmsg->cmsg_type == IPV6_PKTINFO) {
			struct in6_pktinfo *src_info;

			if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
				return -EINVAL;
			src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
			if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
				return -EINVAL;
			ipc->oif = src_info->ipi6_ifindex;
			ipc->addr = src_info->ipi6_addr.s6_addr32[3];
			continue;
		}
#endif
		if (cmsg->cmsg_level == SOL_SOCKET) {
			err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc);
			if (err)
				return err;
			continue;
		}

		if (cmsg->cmsg_level != SOL_IP)
			continue;
		switch (cmsg->cmsg_type) {
		case IP_RETOPTS:
			err = cmsg->cmsg_len - sizeof(struct cmsghdr);

			/* Our caller is responsible for freeing ipc->opt */
			err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
					     err < 40 ? err : 40);
			if (err)
				return err;
			break;
		case IP_PKTINFO:
		{
			struct in_pktinfo *info;
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
				return -EINVAL;
			info = (struct in_pktinfo *)CMSG_DATA(cmsg);
			ipc->oif = info->ipi_ifindex;
			ipc->addr = info->ipi_spec_dst.s_addr;
			break;
		}
		case IP_TTL:
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
				return -EINVAL;
			val = *(int *)CMSG_DATA(cmsg);
			if (val < 1 || val > 255)
				return -EINVAL;
			ipc->ttl = val;
			break;
		case IP_TOS:
			if (cmsg->cmsg_len == CMSG_LEN(sizeof(int)))
				val = *(int *)CMSG_DATA(cmsg);
			else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8)))
				val = *(u8 *)CMSG_DATA(cmsg);
			else
				return -EINVAL;
			if (val < 0 || val > 255)
				return -EINVAL;
			ipc->tos = val;
			ipc->priority = rt_tos2priority(ipc->tos);
			break;

		default:
			return -EINVAL;
		}
	}
	return 0;
}


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116
24.22%
1
5.56%
Hannes Frederic Sowa
101
21.09%
1
5.56%
Eric Dumazet
42
8.77%
4
22.22%
Soheil Hassas Yeganeh
39
8.14%
1
5.56%
Denis V. Lunev
6
1.25%
2
11.11%
Gu Zheng
3
0.63%
1
5.56%
Herbert Xu
3
0.63%
1
5.56%
Total
479
100.00%
18
100.00%

/* Special input handler for packets caught by router alert option.
   They are selected only by protocol field, and then processed likely
   local ones; but only if someone wants them! Otherwise, router
   not running rsvpd will kill RSVP.

   It is user level problem, what it will make with them.
   I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
   but receiver should be enough clever f.e. to forward mtrace requests,
   sent to multicast group to reach destination designated router.
 */

struct ip_ra_chain __rcu *ip_ra_chain;
static DEFINE_SPINLOCK(ip_ra_lock);




static void ip_ra_destroy_rcu(struct rcu_head *head)
{
	struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);

	sock_put(ra->saved_sk);
	kfree(ra);
}

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int ip_ra_control(struct sock *sk, unsigned char on,
		  void (*destructor)(struct sock *))
{
	struct ip_ra_chain *ra, *new_ra;
	struct ip_ra_chain __rcu **rap;

	if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
		return -EINVAL;

	new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;

	spin_lock_bh(&ip_ra_lock);
	for (rap = &ip_ra_chain;
	     (ra = rcu_dereference_protected(*rap,
			lockdep_is_held(&ip_ra_lock))) != NULL;
	     rap = &ra->next) {
		if (ra->sk == sk) {
			if (on) {
				spin_unlock_bh(&ip_ra_lock);
				kfree(new_ra);
				return -EADDRINUSE;
			}
			/* dont let ip_call_ra_chain() use sk again */
			ra->sk = NULL;
			RCU_INIT_POINTER(*rap, ra->next);
			spin_unlock_bh(&ip_ra_lock);

			if (ra->destructor)
				ra->destructor(sk);
			/*
                         * Delay sock_put(sk) and kfree(ra) after one rcu grace
                         * period. This guarantee ip_call_ra_chain() dont need
                         * to mess with socket refcounts.
                         */
			ra->saved_sk = sk;
			call_rcu(&ra->rcu, ip_ra_destroy_rcu);
			return 0;
		}
	}
	if (!new_ra) {
		spin_unlock_bh(&ip_ra_lock);
		return -ENOBUFS;
	}
	new_ra->sk = sk;
	new_ra->destructor = destructor;

	RCU_INIT_POINTER(new_ra->next, ra);
	rcu_assign_pointer(*rap, new_ra);
	sock_hold(sk);
	spin_unlock_bh(&ip_ra_lock);

	return 0;
}

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38.46%
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18.49%
5
38.46%
David S. Miller
3
1.13%
1
7.69%
Arnaldo Carvalho de Melo
1
0.38%
1
7.69%
Ian Morris
1
0.38%
1
7.69%
Total
265
100.00%
13
100.00%



void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
		   __be16 port, u32 info, u8 *payload)
{
	struct sock_exterr_skb *serr;

	skb = skb_clone(skb, GFP_ATOMIC);
	if (!skb)
		return;

	serr = SKB_EXT_ERR(skb);
	serr->ee.ee_errno = err;
	serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
	serr->ee.ee_type = icmp_hdr(skb)->type;
	serr->ee.ee_code = icmp_hdr(skb)->code;
	serr->ee.ee_pad = 0;
	serr->ee.ee_info = info;
	serr->ee.ee_data = 0;
	serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
				   skb_network_header(skb);
	serr->port = port;

	if (skb_pull(skb, payload - skb->data)) {
		skb_reset_transport_header(skb);
		if (sock_queue_err_skb(sk, skb) == 0)
			return;
	}
	kfree_skb(skb);
}

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25
12.63%
3
50.00%
Linus Torvalds
2
1.01%
1
16.67%
Al Viro
1
0.51%
1
16.67%
Total
198
100.00%
6
100.00%



void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
{
	struct inet_sock *inet = inet_sk(sk);
	struct sock_exterr_skb *serr;
	struct iphdr *iph;
	struct sk_buff *skb;

	if (!inet->recverr)
		return;

	skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
	if (!skb)
		return;

	skb_put(skb, sizeof(struct iphdr));
	skb_reset_network_header(skb);
	iph = ip_hdr(skb);
	iph->daddr = daddr;

	serr = SKB_EXT_ERR(skb);
	serr->ee.ee_errno = err;
	serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
	serr->ee.ee_type = 0;
	serr->ee.ee_code = 0;
	serr->ee.ee_pad = 0;
	serr->ee.ee_info = info;
	serr->ee.ee_data = 0;
	serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
	serr->port = port;

	__skb_pull(skb, skb_tail_pointer(skb) - skb->data);
	skb_reset_transport_header(skb);

	if (sock_queue_err_skb(sk, skb))
		kfree_skb(skb);
}

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22
9.87%
6
50.00%
David S. Miller
10
4.48%
1
8.33%
Al Viro
2
0.90%
2
16.67%
Linus Torvalds
1
0.45%
1
8.33%
Total
223
100.00%
12
100.00%

/* For some errors we have valid addr_offset even with zero payload and
 * zero port. Also, addr_offset should be supported if port is set.
 */


static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
{
	return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
	       serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
}

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/* IPv4 supports cmsg on all imcp errors and some timestamps
 *
 * Timestamp code paths do not initialize the fields expected by cmsg:
 * the PKTINFO fields in skb->cb[]. Fill those in here.
 */


static bool ipv4_datagram_support_cmsg(const struct sock *sk,
				       struct sk_buff *skb,
				       int ee_origin)
{
	struct in_pktinfo *info;

	if (ee_origin == SO_EE_ORIGIN_ICMP)
		return true;

	if (ee_origin == SO_EE_ORIGIN_LOCAL)
		return false;

	/* Support IP_PKTINFO on tstamp packets if requested, to correlate
         * timestamp with egress dev. Not possible for packets without iif
         * or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
         */
	info = PKTINFO_SKB_CB(skb);
	if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) ||
	    !info->ipi_ifindex)
		return false;

	info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
	return true;
}

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/*
 *      Handle MSG_ERRQUEUE
 */


int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
{
	struct sock_exterr_skb *serr;
	struct sk_buff *skb;
	DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
	struct {
		struct sock_extended_err ee;
		struct sockaddr_in	 offender;
	} errhdr;
	int err;
	int copied;

	WARN_ON_ONCE(sk->sk_family == AF_INET6);

	err = -EAGAIN;
	skb = sock_dequeue_err_skb(sk);
	if (!skb)
		goto out;

	copied = skb->len;
	if (copied > len) {
		msg->msg_flags |= MSG_TRUNC;
		copied = len;
	}
	err = skb_copy_datagram_msg(skb, 0, msg, copied);
	if (unlikely(err)) {
		kfree_skb(skb);
		return err;
	}
	sock_recv_timestamp(msg, sk, skb);

	serr = SKB_EXT_ERR(skb);

	if (sin && ipv4_datagram_support_addr(serr)) {
		sin->sin_family = AF_INET;
		sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
						   serr->addr_offset);
		sin->sin_port = serr->port;
		memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
		*addr_len = sizeof(*sin);
	}

	memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
	sin = &errhdr.offender;
	memset(sin, 0, sizeof(*sin));

	if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
		sin->sin_family = AF_INET;
		sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
		if (inet_sk(sk)->cmsg_flags)
			ip_cmsg_recv(msg, skb);
	}

	put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);

	/* Now we could try to dump offended packet options */

	msg->msg_flags |= MSG_ERRQUEUE;
	err = copied;

	consume_skb(skb);
out:
	return err;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
255
69.86%
4
20.00%
Willem de Bruijn
39
10.68%
6
30.00%
Linus Torvalds
21
5.75%
1
5.00%
Eric Dumazet
14
3.84%
1
5.00%
Hannes Frederic Sowa
13
3.56%
1
5.00%
Steffen Hurrle
11
3.01%
1
5.00%
Arnaldo Carvalho de Melo
6
1.64%
2
10.00%
Julian Anastasov
3
0.82%
1
5.00%
Ian Morris
1
0.27%
1
5.00%
David S. Miller
1
0.27%
1
5.00%
Al Viro
1
0.27%
1
5.00%
Total
365
100.00%
20
100.00%

/*
 *      Socket option code for IP. This is the end of the line after any
 *      TCP,UDP etc options on an IP socket.
 */


static bool setsockopt_needs_rtnl(int optname)
{
	switch (optname) {
	case IP_ADD_MEMBERSHIP:
	case IP_ADD_SOURCE_MEMBERSHIP:
	case IP_BLOCK_SOURCE:
	case IP_DROP_MEMBERSHIP:
	case IP_DROP_SOURCE_MEMBERSHIP:
	case IP_MSFILTER:
	case IP_UNBLOCK_SOURCE:
	case MCAST_BLOCK_SOURCE:
	case MCAST_MSFILTER:
	case MCAST_JOIN_GROUP:
	case MCAST_JOIN_SOURCE_GROUP:
	case MCAST_LEAVE_GROUP:
	case MCAST_LEAVE_SOURCE_GROUP:
	case MCAST_UNBLOCK_SOURCE:
	case IP_ROUTER_ALERT:
		return true;
	}
	return false;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Marcelo Ricardo Leitner
63
95.45%
2
66.67%
Américo Wang
3
4.55%
1
33.33%
Total
66
100.00%
3
100.00%



static int do_ip_setsockopt(struct sock *sk, int level,
			    int optname, char __user *optval, unsigned int optlen)
{
	struct inet_sock *inet = inet_sk(sk);
	struct net *net = sock_net(sk);
	int val = 0, err;
	bool needs_rtnl = setsockopt_needs_rtnl(optname);

	switch (optname) {
	case IP_PKTINFO:
	case IP_RECVTTL:
	case IP_RECVOPTS:
	case IP_RECVTOS:
	case IP_RETOPTS:
	case IP_TOS:
	case IP_TTL:
	case IP_HDRINCL:
	case IP_MTU_DISCOVER:
	case IP_RECVERR:
	case IP_ROUTER_ALERT:
	case IP_FREEBIND:
	case IP_PASSSEC:
	case IP_TRANSPARENT:
	case IP_MINTTL:
	case IP_NODEFRAG:
	case IP_BIND_ADDRESS_NO_PORT:
	case IP_UNICAST_IF:
	case IP_MULTICAST_TTL:
	case IP_MULTICAST_ALL:
	case IP_MULTICAST_LOOP:
	case IP_RECVORIGDSTADDR:
	case IP_CHECKSUM:
	case IP_RECVFRAGSIZE:
		if (optlen >= sizeof(int)) {
			if (get_user(val, (int __user *) optval))
				return -EFAULT;
		} else if (optlen >= sizeof(char)) {
			unsigned char ucval;

			if (get_user(ucval, (unsigned char __user *) optval))
				return -EFAULT;
			val = (int) ucval;
		}
	}

	/* If optlen==0, it is equivalent to val == 0 */

	if (ip_mroute_opt(optname))
		return ip_mroute_setsockopt(sk, optname, optval, optlen);

	err = 0;
	if (needs_rtnl)
		rtnl_lock();
	lock_sock(sk);

	switch (optname) {
	case IP_OPTIONS:
	{
		struct ip_options_rcu *old, *opt = NULL;

		if (optlen > 40)
			goto e_inval;
		err = ip_options_get_from_user(sock_net(sk), &opt,
					       optval, optlen);
		if (err)
			break;
		old = rcu_dereference_protected(inet->inet_opt,
						lockdep_sock_is_held(sk));
		if (inet->is_icsk) {
			struct inet_connection_sock *icsk = inet_csk(sk