1 // SPDX-License-Identifier: GPL-2.0
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
12 * Many : Split from ip.c , see ip.c for history.
13 * Martin Mares : TOS setting fixed.
14 * Alan Cox : Fixed a couple of oopses in Martin's
16 * Mike McLagan : Routing by source
19 #include <linux/module.h>
20 #include <linux/types.h>
22 #include <linux/skbuff.h>
24 #include <linux/icmp.h>
25 #include <linux/inetdevice.h>
26 #include <linux/netdevice.h>
27 #include <linux/slab.h>
31 #include <net/tcp_states.h>
32 #include <linux/udp.h>
33 #include <linux/igmp.h>
34 #include <linux/netfilter.h>
35 #include <linux/route.h>
36 #include <linux/mroute.h>
37 #include <net/inet_ecn.h>
38 #include <net/route.h>
40 #include <net/compat.h>
41 #include <net/checksum.h>
42 #if IS_ENABLED(CONFIG_IPV6)
43 #include <net/transp_v6.h>
45 #include <net/ip_fib.h>
47 #include <linux/errqueue.h>
48 #include <linux/uaccess.h>
50 #include <linux/bpfilter.h>
53 * SOL_IP control messages.
56 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
58 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
60 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
62 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
65 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
67 int ttl = ip_hdr(skb)->ttl;
68 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
71 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
73 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
76 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
78 if (IPCB(skb)->opt.optlen == 0)
81 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
86 static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg,
89 unsigned char optbuf[sizeof(struct ip_options) + 40];
90 struct ip_options *opt = (struct ip_options *)optbuf;
92 if (IPCB(skb)->opt.optlen == 0)
95 if (ip_options_echo(net, opt, skb)) {
96 msg->msg_flags |= MSG_CTRUNC;
101 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
104 static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb)
108 if (IPCB(skb)->frag_max_size == 0)
111 val = IPCB(skb)->frag_max_size;
112 put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val);
115 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
116 int tlen, int offset)
118 __wsum csum = skb->csum;
120 if (skb->ip_summed != CHECKSUM_COMPLETE)
124 int tend_off = skb_transport_offset(skb) + tlen;
125 csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0));
128 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
131 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
137 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
141 err = security_secid_to_secctx(secid, &secdata, &seclen);
145 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
146 security_release_secctx(secdata, seclen);
149 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
151 __be16 _ports[2], *ports;
152 struct sockaddr_in sin;
154 /* All current transport protocols have the port numbers in the
155 * first four bytes of the transport header and this function is
156 * written with this assumption in mind.
158 ports = skb_header_pointer(skb, skb_transport_offset(skb),
159 sizeof(_ports), &_ports);
163 sin.sin_family = AF_INET;
164 sin.sin_addr.s_addr = ip_hdr(skb)->daddr;
165 sin.sin_port = ports[1];
166 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
168 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
171 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
172 struct sk_buff *skb, int tlen, int offset)
174 struct inet_sock *inet = inet_sk(sk);
175 unsigned int flags = inet->cmsg_flags;
177 /* Ordered by supposed usage frequency */
178 if (flags & IP_CMSG_PKTINFO) {
179 ip_cmsg_recv_pktinfo(msg, skb);
181 flags &= ~IP_CMSG_PKTINFO;
186 if (flags & IP_CMSG_TTL) {
187 ip_cmsg_recv_ttl(msg, skb);
189 flags &= ~IP_CMSG_TTL;
194 if (flags & IP_CMSG_TOS) {
195 ip_cmsg_recv_tos(msg, skb);
197 flags &= ~IP_CMSG_TOS;
202 if (flags & IP_CMSG_RECVOPTS) {
203 ip_cmsg_recv_opts(msg, skb);
205 flags &= ~IP_CMSG_RECVOPTS;
210 if (flags & IP_CMSG_RETOPTS) {
211 ip_cmsg_recv_retopts(sock_net(sk), msg, skb);
213 flags &= ~IP_CMSG_RETOPTS;
218 if (flags & IP_CMSG_PASSSEC) {
219 ip_cmsg_recv_security(msg, skb);
221 flags &= ~IP_CMSG_PASSSEC;
226 if (flags & IP_CMSG_ORIGDSTADDR) {
227 ip_cmsg_recv_dstaddr(msg, skb);
229 flags &= ~IP_CMSG_ORIGDSTADDR;
234 if (flags & IP_CMSG_CHECKSUM)
235 ip_cmsg_recv_checksum(msg, skb, tlen, offset);
237 if (flags & IP_CMSG_RECVFRAGSIZE)
238 ip_cmsg_recv_fragsize(msg, skb);
240 EXPORT_SYMBOL(ip_cmsg_recv_offset);
242 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc,
246 struct cmsghdr *cmsg;
247 struct net *net = sock_net(sk);
249 for_each_cmsghdr(cmsg, msg) {
250 if (!CMSG_OK(msg, cmsg))
252 #if IS_ENABLED(CONFIG_IPV6)
254 cmsg->cmsg_level == SOL_IPV6 &&
255 cmsg->cmsg_type == IPV6_PKTINFO) {
256 struct in6_pktinfo *src_info;
258 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
260 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
261 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
263 if (src_info->ipi6_ifindex)
264 ipc->oif = src_info->ipi6_ifindex;
265 ipc->addr = src_info->ipi6_addr.s6_addr32[3];
269 if (cmsg->cmsg_level == SOL_SOCKET) {
270 err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc);
276 if (cmsg->cmsg_level != SOL_IP)
278 switch (cmsg->cmsg_type) {
280 err = cmsg->cmsg_len - sizeof(struct cmsghdr);
282 /* Our caller is responsible for freeing ipc->opt */
283 err = ip_options_get(net, &ipc->opt,
284 KERNEL_SOCKPTR(CMSG_DATA(cmsg)),
285 err < 40 ? err : 40);
291 struct in_pktinfo *info;
292 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
294 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
295 if (info->ipi_ifindex)
296 ipc->oif = info->ipi_ifindex;
297 ipc->addr = info->ipi_spec_dst.s_addr;
301 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
303 val = *(int *)CMSG_DATA(cmsg);
304 if (val < 1 || val > 255)
309 if (cmsg->cmsg_len == CMSG_LEN(sizeof(int)))
310 val = *(int *)CMSG_DATA(cmsg);
311 else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8)))
312 val = *(u8 *)CMSG_DATA(cmsg);
315 if (val < 0 || val > 255)
318 ipc->priority = rt_tos2priority(ipc->tos);
328 static void ip_ra_destroy_rcu(struct rcu_head *head)
330 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
332 sock_put(ra->saved_sk);
336 int ip_ra_control(struct sock *sk, unsigned char on,
337 void (*destructor)(struct sock *))
339 struct ip_ra_chain *ra, *new_ra;
340 struct ip_ra_chain __rcu **rap;
341 struct net *net = sock_net(sk);
343 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
346 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
350 mutex_lock(&net->ipv4.ra_mutex);
351 for (rap = &net->ipv4.ra_chain;
352 (ra = rcu_dereference_protected(*rap,
353 lockdep_is_held(&net->ipv4.ra_mutex))) != NULL;
357 mutex_unlock(&net->ipv4.ra_mutex);
361 /* dont let ip_call_ra_chain() use sk again */
363 RCU_INIT_POINTER(*rap, ra->next);
364 mutex_unlock(&net->ipv4.ra_mutex);
369 * Delay sock_put(sk) and kfree(ra) after one rcu grace
370 * period. This guarantee ip_call_ra_chain() dont need
371 * to mess with socket refcounts.
374 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
379 mutex_unlock(&net->ipv4.ra_mutex);
383 new_ra->destructor = destructor;
385 RCU_INIT_POINTER(new_ra->next, ra);
386 rcu_assign_pointer(*rap, new_ra);
388 mutex_unlock(&net->ipv4.ra_mutex);
393 static void ipv4_icmp_error_rfc4884(const struct sk_buff *skb,
394 struct sock_ee_data_rfc4884 *out)
396 switch (icmp_hdr(skb)->type) {
397 case ICMP_DEST_UNREACH:
398 case ICMP_TIME_EXCEEDED:
399 case ICMP_PARAMETERPROB:
400 ip_icmp_error_rfc4884(skb, out, sizeof(struct icmphdr),
401 icmp_hdr(skb)->un.reserved[1] * 4);
405 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
406 __be16 port, u32 info, u8 *payload)
408 struct sock_exterr_skb *serr;
410 skb = skb_clone(skb, GFP_ATOMIC);
414 serr = SKB_EXT_ERR(skb);
415 serr->ee.ee_errno = err;
416 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
417 serr->ee.ee_type = icmp_hdr(skb)->type;
418 serr->ee.ee_code = icmp_hdr(skb)->code;
420 serr->ee.ee_info = info;
421 serr->ee.ee_data = 0;
422 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
423 skb_network_header(skb);
426 if (skb_pull(skb, payload - skb->data)) {
427 if (inet_sk(sk)->recverr_rfc4884)
428 ipv4_icmp_error_rfc4884(skb, &serr->ee.ee_rfc4884);
430 skb_reset_transport_header(skb);
431 if (sock_queue_err_skb(sk, skb) == 0)
437 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
439 struct inet_sock *inet = inet_sk(sk);
440 struct sock_exterr_skb *serr;
447 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
451 skb_put(skb, sizeof(struct iphdr));
452 skb_reset_network_header(skb);
456 serr = SKB_EXT_ERR(skb);
457 serr->ee.ee_errno = err;
458 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
459 serr->ee.ee_type = 0;
460 serr->ee.ee_code = 0;
462 serr->ee.ee_info = info;
463 serr->ee.ee_data = 0;
464 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
467 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
468 skb_reset_transport_header(skb);
470 if (sock_queue_err_skb(sk, skb))
474 /* For some errors we have valid addr_offset even with zero payload and
475 * zero port. Also, addr_offset should be supported if port is set.
477 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
479 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
480 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
483 /* IPv4 supports cmsg on all imcp errors and some timestamps
485 * Timestamp code paths do not initialize the fields expected by cmsg:
486 * the PKTINFO fields in skb->cb[]. Fill those in here.
488 static bool ipv4_datagram_support_cmsg(const struct sock *sk,
492 struct in_pktinfo *info;
494 if (ee_origin == SO_EE_ORIGIN_ICMP)
497 if (ee_origin == SO_EE_ORIGIN_LOCAL)
500 /* Support IP_PKTINFO on tstamp packets if requested, to correlate
501 * timestamp with egress dev. Not possible for packets without iif
502 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
504 info = PKTINFO_SKB_CB(skb);
505 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) ||
509 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
514 * Handle MSG_ERRQUEUE
516 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
518 struct sock_exterr_skb *serr;
520 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
522 struct sock_extended_err ee;
523 struct sockaddr_in offender;
529 skb = sock_dequeue_err_skb(sk);
535 msg->msg_flags |= MSG_TRUNC;
538 err = skb_copy_datagram_msg(skb, 0, msg, copied);
543 sock_recv_timestamp(msg, sk, skb);
545 serr = SKB_EXT_ERR(skb);
547 if (sin && ipv4_datagram_support_addr(serr)) {
548 sin->sin_family = AF_INET;
549 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
551 sin->sin_port = serr->port;
552 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
553 *addr_len = sizeof(*sin);
556 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
557 sin = &errhdr.offender;
558 memset(sin, 0, sizeof(*sin));
560 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
561 sin->sin_family = AF_INET;
562 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
563 if (inet_sk(sk)->cmsg_flags)
564 ip_cmsg_recv(msg, skb);
567 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
569 /* Now we could try to dump offended packet options */
571 msg->msg_flags |= MSG_ERRQUEUE;
579 void __ip_sock_set_tos(struct sock *sk, int val)
581 if (sk->sk_type == SOCK_STREAM) {
582 val &= ~INET_ECN_MASK;
583 val |= inet_sk(sk)->tos & INET_ECN_MASK;
585 if (inet_sk(sk)->tos != val) {
586 inet_sk(sk)->tos = val;
587 sk->sk_priority = rt_tos2priority(val);
592 void ip_sock_set_tos(struct sock *sk, int val)
595 __ip_sock_set_tos(sk, val);
598 EXPORT_SYMBOL(ip_sock_set_tos);
600 void ip_sock_set_freebind(struct sock *sk)
603 inet_sk(sk)->freebind = true;
606 EXPORT_SYMBOL(ip_sock_set_freebind);
608 void ip_sock_set_recverr(struct sock *sk)
611 inet_sk(sk)->recverr = true;
614 EXPORT_SYMBOL(ip_sock_set_recverr);
616 int ip_sock_set_mtu_discover(struct sock *sk, int val)
618 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
621 inet_sk(sk)->pmtudisc = val;
625 EXPORT_SYMBOL(ip_sock_set_mtu_discover);
627 void ip_sock_set_pktinfo(struct sock *sk)
630 inet_sk(sk)->cmsg_flags |= IP_CMSG_PKTINFO;
633 EXPORT_SYMBOL(ip_sock_set_pktinfo);
636 * Socket option code for IP. This is the end of the line after any
637 * TCP,UDP etc options on an IP socket.
639 static bool setsockopt_needs_rtnl(int optname)
642 case IP_ADD_MEMBERSHIP:
643 case IP_ADD_SOURCE_MEMBERSHIP:
644 case IP_BLOCK_SOURCE:
645 case IP_DROP_MEMBERSHIP:
646 case IP_DROP_SOURCE_MEMBERSHIP:
648 case IP_UNBLOCK_SOURCE:
649 case MCAST_BLOCK_SOURCE:
651 case MCAST_JOIN_GROUP:
652 case MCAST_JOIN_SOURCE_GROUP:
653 case MCAST_LEAVE_GROUP:
654 case MCAST_LEAVE_SOURCE_GROUP:
655 case MCAST_UNBLOCK_SOURCE:
661 static int set_mcast_msfilter(struct sock *sk, int ifindex,
662 int numsrc, int fmode,
663 struct sockaddr_storage *group,
664 struct sockaddr_storage *list)
666 struct ip_msfilter *msf;
667 struct sockaddr_in *psin;
670 msf = kmalloc(IP_MSFILTER_SIZE(numsrc), GFP_KERNEL);
674 psin = (struct sockaddr_in *)group;
675 if (psin->sin_family != AF_INET)
677 msf->imsf_multiaddr = psin->sin_addr.s_addr;
678 msf->imsf_interface = 0;
679 msf->imsf_fmode = fmode;
680 msf->imsf_numsrc = numsrc;
681 for (i = 0; i < numsrc; ++i) {
682 psin = (struct sockaddr_in *)&list[i];
684 if (psin->sin_family != AF_INET)
686 msf->imsf_slist_flex[i] = psin->sin_addr.s_addr;
688 err = ip_mc_msfilter(sk, msf, ifindex);
694 return -EADDRNOTAVAIL;
697 static int copy_group_source_from_sockptr(struct group_source_req *greqs,
698 sockptr_t optval, int optlen)
700 if (in_compat_syscall()) {
701 struct compat_group_source_req gr32;
703 if (optlen != sizeof(gr32))
705 if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
707 greqs->gsr_interface = gr32.gsr_interface;
708 greqs->gsr_group = gr32.gsr_group;
709 greqs->gsr_source = gr32.gsr_source;
711 if (optlen != sizeof(*greqs))
713 if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
720 static int do_mcast_group_source(struct sock *sk, int optname,
721 sockptr_t optval, int optlen)
723 struct group_source_req greqs;
724 struct ip_mreq_source mreqs;
725 struct sockaddr_in *psin;
728 err = copy_group_source_from_sockptr(&greqs, optval, optlen);
732 if (greqs.gsr_group.ss_family != AF_INET ||
733 greqs.gsr_source.ss_family != AF_INET)
734 return -EADDRNOTAVAIL;
736 psin = (struct sockaddr_in *)&greqs.gsr_group;
737 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
738 psin = (struct sockaddr_in *)&greqs.gsr_source;
739 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
740 mreqs.imr_interface = 0; /* use index for mc_source */
742 if (optname == MCAST_BLOCK_SOURCE) {
743 omode = MCAST_EXCLUDE;
745 } else if (optname == MCAST_UNBLOCK_SOURCE) {
746 omode = MCAST_EXCLUDE;
748 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
749 struct ip_mreqn mreq;
751 psin = (struct sockaddr_in *)&greqs.gsr_group;
752 mreq.imr_multiaddr = psin->sin_addr;
753 mreq.imr_address.s_addr = 0;
754 mreq.imr_ifindex = greqs.gsr_interface;
755 err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE);
756 if (err && err != -EADDRINUSE)
758 greqs.gsr_interface = mreq.imr_ifindex;
759 omode = MCAST_INCLUDE;
761 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
762 omode = MCAST_INCLUDE;
765 return ip_mc_source(add, omode, sk, &mreqs, greqs.gsr_interface);
768 static int ip_set_mcast_msfilter(struct sock *sk, sockptr_t optval, int optlen)
770 struct group_filter *gsf = NULL;
773 if (optlen < GROUP_FILTER_SIZE(0))
775 if (optlen > READ_ONCE(sysctl_optmem_max))
778 gsf = memdup_sockptr(optval, optlen);
782 /* numsrc >= (4G-140)/128 overflow in 32 bits */
784 if (gsf->gf_numsrc >= 0x1ffffff ||
785 gsf->gf_numsrc > READ_ONCE(sock_net(sk)->ipv4.sysctl_igmp_max_msf))
789 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
792 err = set_mcast_msfilter(sk, gsf->gf_interface, gsf->gf_numsrc,
793 gsf->gf_fmode, &gsf->gf_group,
800 static int compat_ip_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
803 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
804 struct compat_group_filter *gf32;
811 if (optlen > READ_ONCE(sysctl_optmem_max) - 4)
814 p = kmalloc(optlen + 4, GFP_KERNEL);
817 gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */
820 if (copy_from_sockptr(gf32, optval, optlen))
823 /* numsrc >= (4G-140)/128 overflow in 32 bits */
830 if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen)
833 /* numsrc >= (4G-140)/128 overflow in 32 bits */
835 if (n > READ_ONCE(sock_net(sk)->ipv4.sysctl_igmp_max_msf))
837 err = set_mcast_msfilter(sk, gf32->gf_interface, n, gf32->gf_fmode,
838 &gf32->gf_group, gf32->gf_slist_flex);
844 static int ip_mcast_join_leave(struct sock *sk, int optname,
845 sockptr_t optval, int optlen)
847 struct ip_mreqn mreq = { };
848 struct sockaddr_in *psin;
849 struct group_req greq;
851 if (optlen < sizeof(struct group_req))
853 if (copy_from_sockptr(&greq, optval, sizeof(greq)))
856 psin = (struct sockaddr_in *)&greq.gr_group;
857 if (psin->sin_family != AF_INET)
859 mreq.imr_multiaddr = psin->sin_addr;
860 mreq.imr_ifindex = greq.gr_interface;
861 if (optname == MCAST_JOIN_GROUP)
862 return ip_mc_join_group(sk, &mreq);
863 return ip_mc_leave_group(sk, &mreq);
866 static int compat_ip_mcast_join_leave(struct sock *sk, int optname,
867 sockptr_t optval, int optlen)
869 struct compat_group_req greq;
870 struct ip_mreqn mreq = { };
871 struct sockaddr_in *psin;
873 if (optlen < sizeof(struct compat_group_req))
875 if (copy_from_sockptr(&greq, optval, sizeof(greq)))
878 psin = (struct sockaddr_in *)&greq.gr_group;
879 if (psin->sin_family != AF_INET)
881 mreq.imr_multiaddr = psin->sin_addr;
882 mreq.imr_ifindex = greq.gr_interface;
884 if (optname == MCAST_JOIN_GROUP)
885 return ip_mc_join_group(sk, &mreq);
886 return ip_mc_leave_group(sk, &mreq);
889 DEFINE_STATIC_KEY_FALSE(ip4_min_ttl);
891 int do_ip_setsockopt(struct sock *sk, int level, int optname,
892 sockptr_t optval, unsigned int optlen)
894 struct inet_sock *inet = inet_sk(sk);
895 struct net *net = sock_net(sk);
897 bool needs_rtnl = setsockopt_needs_rtnl(optname);
908 case IP_MTU_DISCOVER:
910 case IP_ROUTER_ALERT:
916 case IP_BIND_ADDRESS_NO_PORT:
918 case IP_MULTICAST_TTL:
919 case IP_MULTICAST_ALL:
920 case IP_MULTICAST_LOOP:
921 case IP_RECVORIGDSTADDR:
923 case IP_RECVFRAGSIZE:
924 case IP_RECVERR_RFC4884:
925 if (optlen >= sizeof(int)) {
926 if (copy_from_sockptr(&val, optval, sizeof(val)))
928 } else if (optlen >= sizeof(char)) {
931 if (copy_from_sockptr(&ucval, optval, sizeof(ucval)))
937 /* If optlen==0, it is equivalent to val == 0 */
939 if (optname == IP_ROUTER_ALERT)
940 return ip_ra_control(sk, val ? 1 : 0, NULL);
941 if (ip_mroute_opt(optname))
942 return ip_mroute_setsockopt(sk, optname, optval, optlen);
947 sockopt_lock_sock(sk);
952 struct ip_options_rcu *old, *opt = NULL;
956 err = ip_options_get(sock_net(sk), &opt, optval, optlen);
959 old = rcu_dereference_protected(inet->inet_opt,
960 lockdep_sock_is_held(sk));
962 struct inet_connection_sock *icsk = inet_csk(sk);
963 #if IS_ENABLED(CONFIG_IPV6)
964 if (sk->sk_family == PF_INET ||
965 (!((1 << sk->sk_state) &
966 (TCPF_LISTEN | TCPF_CLOSE)) &&
967 inet->inet_daddr != LOOPBACK4_IPV6)) {
970 icsk->icsk_ext_hdr_len -= old->opt.optlen;
972 icsk->icsk_ext_hdr_len += opt->opt.optlen;
973 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
974 #if IS_ENABLED(CONFIG_IPV6)
978 rcu_assign_pointer(inet->inet_opt, opt);
985 inet->cmsg_flags |= IP_CMSG_PKTINFO;
987 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
991 inet->cmsg_flags |= IP_CMSG_TTL;
993 inet->cmsg_flags &= ~IP_CMSG_TTL;
997 inet->cmsg_flags |= IP_CMSG_TOS;
999 inet->cmsg_flags &= ~IP_CMSG_TOS;
1003 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
1005 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
1009 inet->cmsg_flags |= IP_CMSG_RETOPTS;
1011 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
1015 inet->cmsg_flags |= IP_CMSG_PASSSEC;
1017 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
1019 case IP_RECVORIGDSTADDR:
1021 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
1023 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
1027 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
1028 inet_inc_convert_csum(sk);
1029 inet->cmsg_flags |= IP_CMSG_CHECKSUM;
1032 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
1033 inet_dec_convert_csum(sk);
1034 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
1038 case IP_RECVFRAGSIZE:
1039 if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM)
1042 inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE;
1044 inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE;
1046 case IP_TOS: /* This sets both TOS and Precedence */
1047 __ip_sock_set_tos(sk, val);
1052 if (val != -1 && (val < 1 || val > 255))
1057 if (sk->sk_type != SOCK_RAW) {
1061 inet->hdrincl = val ? 1 : 0;
1064 if (sk->sk_type != SOCK_RAW) {
1068 inet->nodefrag = val ? 1 : 0;
1070 case IP_BIND_ADDRESS_NO_PORT:
1071 inet->bind_address_no_port = val ? 1 : 0;
1073 case IP_MTU_DISCOVER:
1074 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
1076 inet->pmtudisc = val;
1079 inet->recverr = !!val;
1081 skb_queue_purge(&sk->sk_error_queue);
1083 case IP_RECVERR_RFC4884:
1084 if (val < 0 || val > 1)
1086 inet->recverr_rfc4884 = !!val;
1088 case IP_MULTICAST_TTL:
1089 if (sk->sk_type == SOCK_STREAM)
1095 if (val < 0 || val > 255)
1099 case IP_MULTICAST_LOOP:
1102 inet->mc_loop = !!val;
1106 struct net_device *dev = NULL;
1110 if (optlen != sizeof(int))
1113 ifindex = (__force int)ntohl((__force __be32)val);
1120 dev = dev_get_by_index(sock_net(sk), ifindex);
1121 err = -EADDRNOTAVAIL;
1125 midx = l3mdev_master_ifindex(dev);
1129 if (sk->sk_bound_dev_if && midx != sk->sk_bound_dev_if)
1132 inet->uc_index = ifindex;
1136 case IP_MULTICAST_IF:
1138 struct ip_mreqn mreq;
1139 struct net_device *dev = NULL;
1142 if (sk->sk_type == SOCK_STREAM)
1145 * Check the arguments are allowable
1148 if (optlen < sizeof(struct in_addr))
1152 if (optlen >= sizeof(struct ip_mreqn)) {
1153 if (copy_from_sockptr(&mreq, optval, sizeof(mreq)))
1156 memset(&mreq, 0, sizeof(mreq));
1157 if (optlen >= sizeof(struct ip_mreq)) {
1158 if (copy_from_sockptr(&mreq, optval,
1159 sizeof(struct ip_mreq)))
1161 } else if (optlen >= sizeof(struct in_addr)) {
1162 if (copy_from_sockptr(&mreq.imr_address, optval,
1163 sizeof(struct in_addr)))
1168 if (!mreq.imr_ifindex) {
1169 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
1175 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
1177 mreq.imr_ifindex = dev->ifindex;
1179 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
1182 err = -EADDRNOTAVAIL;
1186 midx = l3mdev_master_ifindex(dev);
1191 if (sk->sk_bound_dev_if &&
1192 mreq.imr_ifindex != sk->sk_bound_dev_if &&
1193 midx != sk->sk_bound_dev_if)
1196 inet->mc_index = mreq.imr_ifindex;
1197 inet->mc_addr = mreq.imr_address.s_addr;
1202 case IP_ADD_MEMBERSHIP:
1203 case IP_DROP_MEMBERSHIP:
1205 struct ip_mreqn mreq;
1208 if (inet_sk(sk)->is_icsk)
1211 if (optlen < sizeof(struct ip_mreq))
1214 if (optlen >= sizeof(struct ip_mreqn)) {
1215 if (copy_from_sockptr(&mreq, optval, sizeof(mreq)))
1218 memset(&mreq, 0, sizeof(mreq));
1219 if (copy_from_sockptr(&mreq, optval,
1220 sizeof(struct ip_mreq)))
1224 if (optname == IP_ADD_MEMBERSHIP)
1225 err = ip_mc_join_group(sk, &mreq);
1227 err = ip_mc_leave_group(sk, &mreq);
1232 struct ip_msfilter *msf;
1234 if (optlen < IP_MSFILTER_SIZE(0))
1236 if (optlen > READ_ONCE(sysctl_optmem_max)) {
1240 msf = memdup_sockptr(optval, optlen);
1245 /* numsrc >= (1G-4) overflow in 32 bits */
1246 if (msf->imsf_numsrc >= 0x3ffffffcU ||
1247 msf->imsf_numsrc > READ_ONCE(net->ipv4.sysctl_igmp_max_msf)) {
1252 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
1257 err = ip_mc_msfilter(sk, msf, 0);
1261 case IP_BLOCK_SOURCE:
1262 case IP_UNBLOCK_SOURCE:
1263 case IP_ADD_SOURCE_MEMBERSHIP:
1264 case IP_DROP_SOURCE_MEMBERSHIP:
1266 struct ip_mreq_source mreqs;
1269 if (optlen != sizeof(struct ip_mreq_source))
1271 if (copy_from_sockptr(&mreqs, optval, sizeof(mreqs))) {
1275 if (optname == IP_BLOCK_SOURCE) {
1276 omode = MCAST_EXCLUDE;
1278 } else if (optname == IP_UNBLOCK_SOURCE) {
1279 omode = MCAST_EXCLUDE;
1281 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
1282 struct ip_mreqn mreq;
1284 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
1285 mreq.imr_address.s_addr = mreqs.imr_interface;
1286 mreq.imr_ifindex = 0;
1287 err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE);
1288 if (err && err != -EADDRINUSE)
1290 omode = MCAST_INCLUDE;
1292 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
1293 omode = MCAST_INCLUDE;
1296 err = ip_mc_source(add, omode, sk, &mreqs, 0);
1299 case MCAST_JOIN_GROUP:
1300 case MCAST_LEAVE_GROUP:
1301 if (in_compat_syscall())
1302 err = compat_ip_mcast_join_leave(sk, optname, optval,
1305 err = ip_mcast_join_leave(sk, optname, optval, optlen);
1307 case MCAST_JOIN_SOURCE_GROUP:
1308 case MCAST_LEAVE_SOURCE_GROUP:
1309 case MCAST_BLOCK_SOURCE:
1310 case MCAST_UNBLOCK_SOURCE:
1311 err = do_mcast_group_source(sk, optname, optval, optlen);
1313 case MCAST_MSFILTER:
1314 if (in_compat_syscall())
1315 err = compat_ip_set_mcast_msfilter(sk, optval, optlen);
1317 err = ip_set_mcast_msfilter(sk, optval, optlen);
1319 case IP_MULTICAST_ALL:
1322 if (val != 0 && val != 1)
1330 inet->freebind = !!val;
1333 case IP_IPSEC_POLICY:
1334 case IP_XFRM_POLICY:
1336 if (!sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1338 err = xfrm_user_policy(sk, optname, optval, optlen);
1341 case IP_TRANSPARENT:
1342 if (!!val && !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1343 !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1349 inet->transparent = !!val;
1355 if (val < 0 || val > 255)
1359 static_branch_enable(&ip4_min_ttl);
1361 /* tcp_v4_err() and tcp_v4_rcv() might read min_ttl
1362 * while we are changint it.
1364 WRITE_ONCE(inet->min_ttl, val);
1371 sockopt_release_sock(sk);
1377 sockopt_release_sock(sk);
1384 * ipv4_pktinfo_prepare - transfer some info from rtable to skb
1388 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1389 * destination in skb->cb[] before dst drop.
1390 * This way, receiver doesn't make cache line misses to read rtable.
1392 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
1394 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1395 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1398 if (prepare && skb_rtable(skb)) {
1399 /* skb->cb is overloaded: prior to this point it is IP{6}CB
1400 * which has interface index (iif) as the first member of the
1401 * underlying inet{6}_skb_parm struct. This code then overlays
1402 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first
1403 * element so the iif is picked up from the prior IPCB. If iif
1404 * is the loopback interface, then return the sending interface
1405 * (e.g., process binds socket to eth0 for Tx which is
1406 * redirected to loopback in the rtable/dst).
1408 struct rtable *rt = skb_rtable(skb);
1409 bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags);
1411 if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX)
1412 pktinfo->ipi_ifindex = inet_iif(skb);
1413 else if (l3slave && rt && rt->rt_iif)
1414 pktinfo->ipi_ifindex = rt->rt_iif;
1416 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1418 pktinfo->ipi_ifindex = 0;
1419 pktinfo->ipi_spec_dst.s_addr = 0;
1424 int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
1425 unsigned int optlen)
1429 if (level != SOL_IP)
1430 return -ENOPROTOOPT;
1432 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1433 #if IS_ENABLED(CONFIG_BPFILTER_UMH)
1434 if (optname >= BPFILTER_IPT_SO_SET_REPLACE &&
1435 optname < BPFILTER_IPT_SET_MAX)
1436 err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen);
1438 #ifdef CONFIG_NETFILTER
1439 /* we need to exclude all possible ENOPROTOOPTs except default case */
1440 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1441 optname != IP_IPSEC_POLICY &&
1442 optname != IP_XFRM_POLICY &&
1443 !ip_mroute_opt(optname))
1444 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1448 EXPORT_SYMBOL(ip_setsockopt);
1451 * Get the options. Note for future reference. The GET of IP options gets
1452 * the _received_ ones. The set sets the _sent_ ones.
1455 static bool getsockopt_needs_rtnl(int optname)
1459 case MCAST_MSFILTER:
1465 static int ip_get_mcast_msfilter(struct sock *sk, sockptr_t optval,
1466 sockptr_t optlen, int len)
1468 const int size0 = offsetof(struct group_filter, gf_slist_flex);
1469 struct group_filter gsf;
1475 if (copy_from_sockptr(&gsf, optval, size0))
1478 num = gsf.gf_numsrc;
1479 err = ip_mc_gsfget(sk, &gsf, optval,
1480 offsetof(struct group_filter, gf_slist_flex));
1483 if (gsf.gf_numsrc < num)
1484 num = gsf.gf_numsrc;
1485 gsf_size = GROUP_FILTER_SIZE(num);
1486 if (copy_to_sockptr(optlen, &gsf_size, sizeof(int)) ||
1487 copy_to_sockptr(optval, &gsf, size0))
1492 static int compat_ip_get_mcast_msfilter(struct sock *sk, sockptr_t optval,
1493 sockptr_t optlen, int len)
1495 const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
1496 struct compat_group_filter gf32;
1497 struct group_filter gf;
1503 if (copy_from_sockptr(&gf32, optval, size0))
1506 gf.gf_interface = gf32.gf_interface;
1507 gf.gf_fmode = gf32.gf_fmode;
1508 num = gf.gf_numsrc = gf32.gf_numsrc;
1509 gf.gf_group = gf32.gf_group;
1511 err = ip_mc_gsfget(sk, &gf, optval,
1512 offsetof(struct compat_group_filter, gf_slist_flex));
1515 if (gf.gf_numsrc < num)
1517 len = GROUP_FILTER_SIZE(num) - (sizeof(gf) - sizeof(gf32));
1518 if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
1519 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode),
1520 &gf.gf_fmode, sizeof(gf.gf_fmode)) ||
1521 copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc),
1522 &gf.gf_numsrc, sizeof(gf.gf_numsrc)))
1527 int do_ip_getsockopt(struct sock *sk, int level, int optname,
1528 sockptr_t optval, sockptr_t optlen)
1530 struct inet_sock *inet = inet_sk(sk);
1531 bool needs_rtnl = getsockopt_needs_rtnl(optname);
1535 if (level != SOL_IP)
1538 if (ip_mroute_opt(optname))
1539 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1541 if (copy_from_sockptr(&len, optlen, sizeof(int)))
1548 sockopt_lock_sock(sk);
1553 unsigned char optbuf[sizeof(struct ip_options)+40];
1554 struct ip_options *opt = (struct ip_options *)optbuf;
1555 struct ip_options_rcu *inet_opt;
1557 inet_opt = rcu_dereference_protected(inet->inet_opt,
1558 lockdep_sock_is_held(sk));
1561 memcpy(optbuf, &inet_opt->opt,
1562 sizeof(struct ip_options) +
1563 inet_opt->opt.optlen);
1564 sockopt_release_sock(sk);
1566 if (opt->optlen == 0) {
1568 return copy_to_sockptr(optlen, &len, sizeof(int));
1571 ip_options_undo(opt);
1573 len = min_t(unsigned int, len, opt->optlen);
1574 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1576 if (copy_to_sockptr(optval, opt->__data, len))
1581 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1584 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1587 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1590 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1593 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1596 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1598 case IP_RECVORIGDSTADDR:
1599 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1602 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;
1604 case IP_RECVFRAGSIZE:
1605 val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0;
1612 struct net *net = sock_net(sk);
1613 val = (inet->uc_ttl == -1 ?
1614 READ_ONCE(net->ipv4.sysctl_ip_default_ttl) :
1619 val = inet->hdrincl;
1622 val = inet->nodefrag;
1624 case IP_BIND_ADDRESS_NO_PORT:
1625 val = inet->bind_address_no_port;
1627 case IP_MTU_DISCOVER:
1628 val = inet->pmtudisc;
1632 struct dst_entry *dst;
1634 dst = sk_dst_get(sk);
1640 sockopt_release_sock(sk);
1646 val = inet->recverr;
1648 case IP_RECVERR_RFC4884:
1649 val = inet->recverr_rfc4884;
1651 case IP_MULTICAST_TTL:
1654 case IP_MULTICAST_LOOP:
1655 val = inet->mc_loop;
1658 val = (__force int)htonl((__u32) inet->uc_index);
1660 case IP_MULTICAST_IF:
1662 struct in_addr addr;
1663 len = min_t(unsigned int, len, sizeof(struct in_addr));
1664 addr.s_addr = inet->mc_addr;
1665 sockopt_release_sock(sk);
1667 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1669 if (copy_to_sockptr(optval, &addr, len))
1675 struct ip_msfilter msf;
1677 if (len < IP_MSFILTER_SIZE(0)) {
1681 if (copy_from_sockptr(&msf, optval, IP_MSFILTER_SIZE(0))) {
1685 err = ip_mc_msfget(sk, &msf, optval, optlen);
1688 case MCAST_MSFILTER:
1689 if (in_compat_syscall())
1690 err = compat_ip_get_mcast_msfilter(sk, optval, optlen,
1693 err = ip_get_mcast_msfilter(sk, optval, optlen, len);
1695 case IP_MULTICAST_ALL:
1702 sockopt_release_sock(sk);
1704 if (sk->sk_type != SOCK_STREAM)
1705 return -ENOPROTOOPT;
1707 if (optval.is_kernel) {
1708 msg.msg_control_is_user = false;
1709 msg.msg_control = optval.kernel;
1711 msg.msg_control_is_user = true;
1712 msg.msg_control_user = optval.user;
1714 msg.msg_controllen = len;
1715 msg.msg_flags = in_compat_syscall() ? MSG_CMSG_COMPAT : 0;
1717 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1718 struct in_pktinfo info;
1720 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1721 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1722 info.ipi_ifindex = inet->mc_index;
1723 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1725 if (inet->cmsg_flags & IP_CMSG_TTL) {
1726 int hlim = inet->mc_ttl;
1727 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1729 if (inet->cmsg_flags & IP_CMSG_TOS) {
1730 int tos = inet->rcv_tos;
1731 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1733 len -= msg.msg_controllen;
1734 return copy_to_sockptr(optlen, &len, sizeof(int));
1737 val = inet->freebind;
1739 case IP_TRANSPARENT:
1740 val = inet->transparent;
1743 val = inet->min_ttl;
1746 sockopt_release_sock(sk);
1747 return -ENOPROTOOPT;
1749 sockopt_release_sock(sk);
1751 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1752 unsigned char ucval = (unsigned char)val;
1754 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1756 if (copy_to_sockptr(optval, &ucval, 1))
1759 len = min_t(unsigned int, sizeof(int), len);
1760 if (copy_to_sockptr(optlen, &len, sizeof(int)))
1762 if (copy_to_sockptr(optval, &val, len))
1768 sockopt_release_sock(sk);
1774 int ip_getsockopt(struct sock *sk, int level,
1775 int optname, char __user *optval, int __user *optlen)
1779 err = do_ip_getsockopt(sk, level, optname,
1780 USER_SOCKPTR(optval), USER_SOCKPTR(optlen));
1782 #if IS_ENABLED(CONFIG_BPFILTER_UMH)
1783 if (optname >= BPFILTER_IPT_SO_GET_INFO &&
1784 optname < BPFILTER_IPT_GET_MAX)
1785 err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen);
1787 #ifdef CONFIG_NETFILTER
1788 /* we need to exclude all possible ENOPROTOOPTs except default case */
1789 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1790 !ip_mroute_opt(optname)) {
1793 if (get_user(len, optlen))
1796 err = nf_getsockopt(sk, PF_INET, optname, optval, &len);
1798 err = put_user(len, optlen);
1804 EXPORT_SYMBOL(ip_getsockopt);