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>
51 * SOL_IP control messages.
54 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
56 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
58 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
60 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
63 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
65 int ttl = ip_hdr(skb)->ttl;
66 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
69 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
71 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
74 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
76 if (IPCB(skb)->opt.optlen == 0)
79 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
84 static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg,
87 unsigned char optbuf[sizeof(struct ip_options) + 40];
88 struct ip_options *opt = (struct ip_options *)optbuf;
90 if (IPCB(skb)->opt.optlen == 0)
93 if (ip_options_echo(net, opt, skb)) {
94 msg->msg_flags |= MSG_CTRUNC;
99 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
102 static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb)
106 if (IPCB(skb)->frag_max_size == 0)
109 val = IPCB(skb)->frag_max_size;
110 put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val);
113 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
114 int tlen, int offset)
116 __wsum csum = skb->csum;
118 if (skb->ip_summed != CHECKSUM_COMPLETE)
122 int tend_off = skb_transport_offset(skb) + tlen;
123 csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0));
126 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
129 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
135 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
139 err = security_secid_to_secctx(secid, &secdata, &seclen);
143 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
144 security_release_secctx(secdata, seclen);
147 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
149 struct sockaddr_in sin;
150 const struct iphdr *iph = ip_hdr(skb);
151 __be16 *ports = (__be16 *)skb_transport_header(skb);
153 if (skb_transport_offset(skb) + 4 > (int)skb->len)
156 /* All current transport protocols have the port numbers in the
157 * first four bytes of the transport header and this function is
158 * written with this assumption in mind.
161 sin.sin_family = AF_INET;
162 sin.sin_addr.s_addr = iph->daddr;
163 sin.sin_port = ports[1];
164 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
166 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
169 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
170 struct sk_buff *skb, int tlen, int offset)
172 struct inet_sock *inet = inet_sk(sk);
173 unsigned int flags = inet->cmsg_flags;
175 /* Ordered by supposed usage frequency */
176 if (flags & IP_CMSG_PKTINFO) {
177 ip_cmsg_recv_pktinfo(msg, skb);
179 flags &= ~IP_CMSG_PKTINFO;
184 if (flags & IP_CMSG_TTL) {
185 ip_cmsg_recv_ttl(msg, skb);
187 flags &= ~IP_CMSG_TTL;
192 if (flags & IP_CMSG_TOS) {
193 ip_cmsg_recv_tos(msg, skb);
195 flags &= ~IP_CMSG_TOS;
200 if (flags & IP_CMSG_RECVOPTS) {
201 ip_cmsg_recv_opts(msg, skb);
203 flags &= ~IP_CMSG_RECVOPTS;
208 if (flags & IP_CMSG_RETOPTS) {
209 ip_cmsg_recv_retopts(sock_net(sk), msg, skb);
211 flags &= ~IP_CMSG_RETOPTS;
216 if (flags & IP_CMSG_PASSSEC) {
217 ip_cmsg_recv_security(msg, skb);
219 flags &= ~IP_CMSG_PASSSEC;
224 if (flags & IP_CMSG_ORIGDSTADDR) {
225 ip_cmsg_recv_dstaddr(msg, skb);
227 flags &= ~IP_CMSG_ORIGDSTADDR;
232 if (flags & IP_CMSG_CHECKSUM)
233 ip_cmsg_recv_checksum(msg, skb, tlen, offset);
235 if (flags & IP_CMSG_RECVFRAGSIZE)
236 ip_cmsg_recv_fragsize(msg, skb);
238 EXPORT_SYMBOL(ip_cmsg_recv_offset);
240 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc,
244 struct cmsghdr *cmsg;
245 struct net *net = sock_net(sk);
247 for_each_cmsghdr(cmsg, msg) {
248 if (!CMSG_OK(msg, cmsg))
250 #if IS_ENABLED(CONFIG_IPV6)
252 cmsg->cmsg_level == SOL_IPV6 &&
253 cmsg->cmsg_type == IPV6_PKTINFO) {
254 struct in6_pktinfo *src_info;
256 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
258 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
259 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
261 if (src_info->ipi6_ifindex)
262 ipc->oif = src_info->ipi6_ifindex;
263 ipc->addr = src_info->ipi6_addr.s6_addr32[3];
267 if (cmsg->cmsg_level == SOL_SOCKET) {
268 err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc);
274 if (cmsg->cmsg_level != SOL_IP)
276 switch (cmsg->cmsg_type) {
278 err = cmsg->cmsg_len - sizeof(struct cmsghdr);
280 /* Our caller is responsible for freeing ipc->opt */
281 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
282 err < 40 ? err : 40);
288 struct in_pktinfo *info;
289 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
291 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
292 if (info->ipi_ifindex)
293 ipc->oif = info->ipi_ifindex;
294 ipc->addr = info->ipi_spec_dst.s_addr;
298 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
300 val = *(int *)CMSG_DATA(cmsg);
301 if (val < 1 || val > 255)
306 if (cmsg->cmsg_len == CMSG_LEN(sizeof(int)))
307 val = *(int *)CMSG_DATA(cmsg);
308 else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8)))
309 val = *(u8 *)CMSG_DATA(cmsg);
312 if (val < 0 || val > 255)
315 ipc->priority = rt_tos2priority(ipc->tos);
325 static void ip_ra_destroy_rcu(struct rcu_head *head)
327 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
329 sock_put(ra->saved_sk);
333 int ip_ra_control(struct sock *sk, unsigned char on,
334 void (*destructor)(struct sock *))
336 struct ip_ra_chain *ra, *new_ra;
337 struct ip_ra_chain __rcu **rap;
338 struct net *net = sock_net(sk);
340 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
343 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
345 mutex_lock(&net->ipv4.ra_mutex);
346 for (rap = &net->ipv4.ra_chain;
347 (ra = rcu_dereference_protected(*rap,
348 lockdep_is_held(&net->ipv4.ra_mutex))) != NULL;
352 mutex_unlock(&net->ipv4.ra_mutex);
356 /* dont let ip_call_ra_chain() use sk again */
358 RCU_INIT_POINTER(*rap, ra->next);
359 mutex_unlock(&net->ipv4.ra_mutex);
364 * Delay sock_put(sk) and kfree(ra) after one rcu grace
365 * period. This guarantee ip_call_ra_chain() dont need
366 * to mess with socket refcounts.
369 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
374 mutex_unlock(&net->ipv4.ra_mutex);
378 new_ra->destructor = destructor;
380 RCU_INIT_POINTER(new_ra->next, ra);
381 rcu_assign_pointer(*rap, new_ra);
383 mutex_unlock(&net->ipv4.ra_mutex);
388 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
389 __be16 port, u32 info, u8 *payload)
391 struct sock_exterr_skb *serr;
393 skb = skb_clone(skb, GFP_ATOMIC);
397 serr = SKB_EXT_ERR(skb);
398 serr->ee.ee_errno = err;
399 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
400 serr->ee.ee_type = icmp_hdr(skb)->type;
401 serr->ee.ee_code = icmp_hdr(skb)->code;
403 serr->ee.ee_info = info;
404 serr->ee.ee_data = 0;
405 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
406 skb_network_header(skb);
409 if (skb_pull(skb, payload - skb->data)) {
410 skb_reset_transport_header(skb);
411 if (sock_queue_err_skb(sk, skb) == 0)
417 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
419 struct inet_sock *inet = inet_sk(sk);
420 struct sock_exterr_skb *serr;
427 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
431 skb_put(skb, sizeof(struct iphdr));
432 skb_reset_network_header(skb);
436 serr = SKB_EXT_ERR(skb);
437 serr->ee.ee_errno = err;
438 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
439 serr->ee.ee_type = 0;
440 serr->ee.ee_code = 0;
442 serr->ee.ee_info = info;
443 serr->ee.ee_data = 0;
444 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
447 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
448 skb_reset_transport_header(skb);
450 if (sock_queue_err_skb(sk, skb))
454 /* For some errors we have valid addr_offset even with zero payload and
455 * zero port. Also, addr_offset should be supported if port is set.
457 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
459 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
460 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
463 /* IPv4 supports cmsg on all imcp errors and some timestamps
465 * Timestamp code paths do not initialize the fields expected by cmsg:
466 * the PKTINFO fields in skb->cb[]. Fill those in here.
468 static bool ipv4_datagram_support_cmsg(const struct sock *sk,
472 struct in_pktinfo *info;
474 if (ee_origin == SO_EE_ORIGIN_ICMP)
477 if (ee_origin == SO_EE_ORIGIN_LOCAL)
480 /* Support IP_PKTINFO on tstamp packets if requested, to correlate
481 * timestamp with egress dev. Not possible for packets without iif
482 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
484 info = PKTINFO_SKB_CB(skb);
485 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) ||
489 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
494 * Handle MSG_ERRQUEUE
496 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
498 struct sock_exterr_skb *serr;
500 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
502 struct sock_extended_err ee;
503 struct sockaddr_in offender;
508 WARN_ON_ONCE(sk->sk_family == AF_INET6);
511 skb = sock_dequeue_err_skb(sk);
517 msg->msg_flags |= MSG_TRUNC;
520 err = skb_copy_datagram_msg(skb, 0, msg, copied);
525 sock_recv_timestamp(msg, sk, skb);
527 serr = SKB_EXT_ERR(skb);
529 if (sin && ipv4_datagram_support_addr(serr)) {
530 sin->sin_family = AF_INET;
531 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
533 sin->sin_port = serr->port;
534 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
535 *addr_len = sizeof(*sin);
538 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
539 sin = &errhdr.offender;
540 memset(sin, 0, sizeof(*sin));
542 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
543 sin->sin_family = AF_INET;
544 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
545 if (inet_sk(sk)->cmsg_flags)
546 ip_cmsg_recv(msg, skb);
549 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
551 /* Now we could try to dump offended packet options */
553 msg->msg_flags |= MSG_ERRQUEUE;
563 * Socket option code for IP. This is the end of the line after any
564 * TCP,UDP etc options on an IP socket.
566 static bool setsockopt_needs_rtnl(int optname)
569 case IP_ADD_MEMBERSHIP:
570 case IP_ADD_SOURCE_MEMBERSHIP:
571 case IP_BLOCK_SOURCE:
572 case IP_DROP_MEMBERSHIP:
573 case IP_DROP_SOURCE_MEMBERSHIP:
575 case IP_UNBLOCK_SOURCE:
576 case MCAST_BLOCK_SOURCE:
578 case MCAST_JOIN_GROUP:
579 case MCAST_JOIN_SOURCE_GROUP:
580 case MCAST_LEAVE_GROUP:
581 case MCAST_LEAVE_SOURCE_GROUP:
582 case MCAST_UNBLOCK_SOURCE:
588 static int do_ip_setsockopt(struct sock *sk, int level,
589 int optname, char __user *optval, unsigned int optlen)
591 struct inet_sock *inet = inet_sk(sk);
592 struct net *net = sock_net(sk);
594 bool needs_rtnl = setsockopt_needs_rtnl(optname);
605 case IP_MTU_DISCOVER:
607 case IP_ROUTER_ALERT:
613 case IP_BIND_ADDRESS_NO_PORT:
615 case IP_MULTICAST_TTL:
616 case IP_MULTICAST_ALL:
617 case IP_MULTICAST_LOOP:
618 case IP_RECVORIGDSTADDR:
620 case IP_RECVFRAGSIZE:
621 if (optlen >= sizeof(int)) {
622 if (get_user(val, (int __user *) optval))
624 } else if (optlen >= sizeof(char)) {
627 if (get_user(ucval, (unsigned char __user *) optval))
633 /* If optlen==0, it is equivalent to val == 0 */
635 if (optname == IP_ROUTER_ALERT)
636 return ip_ra_control(sk, val ? 1 : 0, NULL);
637 if (ip_mroute_opt(optname))
638 return ip_mroute_setsockopt(sk, optname, optval, optlen);
648 struct ip_options_rcu *old, *opt = NULL;
652 err = ip_options_get_from_user(sock_net(sk), &opt,
656 old = rcu_dereference_protected(inet->inet_opt,
657 lockdep_sock_is_held(sk));
659 struct inet_connection_sock *icsk = inet_csk(sk);
660 #if IS_ENABLED(CONFIG_IPV6)
661 if (sk->sk_family == PF_INET ||
662 (!((1 << sk->sk_state) &
663 (TCPF_LISTEN | TCPF_CLOSE)) &&
664 inet->inet_daddr != LOOPBACK4_IPV6)) {
667 icsk->icsk_ext_hdr_len -= old->opt.optlen;
669 icsk->icsk_ext_hdr_len += opt->opt.optlen;
670 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
671 #if IS_ENABLED(CONFIG_IPV6)
675 rcu_assign_pointer(inet->inet_opt, opt);
682 inet->cmsg_flags |= IP_CMSG_PKTINFO;
684 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
688 inet->cmsg_flags |= IP_CMSG_TTL;
690 inet->cmsg_flags &= ~IP_CMSG_TTL;
694 inet->cmsg_flags |= IP_CMSG_TOS;
696 inet->cmsg_flags &= ~IP_CMSG_TOS;
700 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
702 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
706 inet->cmsg_flags |= IP_CMSG_RETOPTS;
708 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
712 inet->cmsg_flags |= IP_CMSG_PASSSEC;
714 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
716 case IP_RECVORIGDSTADDR:
718 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
720 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
724 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
725 inet_inc_convert_csum(sk);
726 inet->cmsg_flags |= IP_CMSG_CHECKSUM;
729 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
730 inet_dec_convert_csum(sk);
731 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
735 case IP_RECVFRAGSIZE:
736 if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM)
739 inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE;
741 inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE;
743 case IP_TOS: /* This sets both TOS and Precedence */
744 if (sk->sk_type == SOCK_STREAM) {
745 val &= ~INET_ECN_MASK;
746 val |= inet->tos & INET_ECN_MASK;
748 if (inet->tos != val) {
750 sk->sk_priority = rt_tos2priority(val);
757 if (val != -1 && (val < 1 || val > 255))
762 if (sk->sk_type != SOCK_RAW) {
766 inet->hdrincl = val ? 1 : 0;
769 if (sk->sk_type != SOCK_RAW) {
773 inet->nodefrag = val ? 1 : 0;
775 case IP_BIND_ADDRESS_NO_PORT:
776 inet->bind_address_no_port = val ? 1 : 0;
778 case IP_MTU_DISCOVER:
779 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
781 inet->pmtudisc = val;
784 inet->recverr = !!val;
786 skb_queue_purge(&sk->sk_error_queue);
788 case IP_MULTICAST_TTL:
789 if (sk->sk_type == SOCK_STREAM)
795 if (val < 0 || val > 255)
799 case IP_MULTICAST_LOOP:
802 inet->mc_loop = !!val;
806 struct net_device *dev = NULL;
810 if (optlen != sizeof(int))
813 ifindex = (__force int)ntohl((__force __be32)val);
820 dev = dev_get_by_index(sock_net(sk), ifindex);
821 err = -EADDRNOTAVAIL;
825 midx = l3mdev_master_ifindex(dev);
829 if (sk->sk_bound_dev_if &&
830 (!midx || midx != sk->sk_bound_dev_if))
833 inet->uc_index = ifindex;
837 case IP_MULTICAST_IF:
839 struct ip_mreqn mreq;
840 struct net_device *dev = NULL;
843 if (sk->sk_type == SOCK_STREAM)
846 * Check the arguments are allowable
849 if (optlen < sizeof(struct in_addr))
853 if (optlen >= sizeof(struct ip_mreqn)) {
854 if (copy_from_user(&mreq, optval, sizeof(mreq)))
857 memset(&mreq, 0, sizeof(mreq));
858 if (optlen >= sizeof(struct ip_mreq)) {
859 if (copy_from_user(&mreq, optval,
860 sizeof(struct ip_mreq)))
862 } else if (optlen >= sizeof(struct in_addr)) {
863 if (copy_from_user(&mreq.imr_address, optval,
864 sizeof(struct in_addr)))
869 if (!mreq.imr_ifindex) {
870 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
876 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
878 mreq.imr_ifindex = dev->ifindex;
880 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
883 err = -EADDRNOTAVAIL;
887 midx = l3mdev_master_ifindex(dev);
892 if (sk->sk_bound_dev_if &&
893 mreq.imr_ifindex != sk->sk_bound_dev_if &&
894 (!midx || midx != sk->sk_bound_dev_if))
897 inet->mc_index = mreq.imr_ifindex;
898 inet->mc_addr = mreq.imr_address.s_addr;
903 case IP_ADD_MEMBERSHIP:
904 case IP_DROP_MEMBERSHIP:
906 struct ip_mreqn mreq;
909 if (inet_sk(sk)->is_icsk)
912 if (optlen < sizeof(struct ip_mreq))
915 if (optlen >= sizeof(struct ip_mreqn)) {
916 if (copy_from_user(&mreq, optval, sizeof(mreq)))
919 memset(&mreq, 0, sizeof(mreq));
920 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
924 if (optname == IP_ADD_MEMBERSHIP)
925 err = ip_mc_join_group(sk, &mreq);
927 err = ip_mc_leave_group(sk, &mreq);
932 struct ip_msfilter *msf;
934 if (optlen < IP_MSFILTER_SIZE(0))
936 if (optlen > sysctl_optmem_max) {
940 msf = memdup_user(optval, optlen);
945 /* numsrc >= (1G-4) overflow in 32 bits */
946 if (msf->imsf_numsrc >= 0x3ffffffcU ||
947 msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
952 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
957 err = ip_mc_msfilter(sk, msf, 0);
961 case IP_BLOCK_SOURCE:
962 case IP_UNBLOCK_SOURCE:
963 case IP_ADD_SOURCE_MEMBERSHIP:
964 case IP_DROP_SOURCE_MEMBERSHIP:
966 struct ip_mreq_source mreqs;
969 if (optlen != sizeof(struct ip_mreq_source))
971 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
975 if (optname == IP_BLOCK_SOURCE) {
976 omode = MCAST_EXCLUDE;
978 } else if (optname == IP_UNBLOCK_SOURCE) {
979 omode = MCAST_EXCLUDE;
981 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
982 struct ip_mreqn mreq;
984 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
985 mreq.imr_address.s_addr = mreqs.imr_interface;
986 mreq.imr_ifindex = 0;
987 err = ip_mc_join_group(sk, &mreq);
988 if (err && err != -EADDRINUSE)
990 omode = MCAST_INCLUDE;
992 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
993 omode = MCAST_INCLUDE;
996 err = ip_mc_source(add, omode, sk, &mreqs, 0);
999 case MCAST_JOIN_GROUP:
1000 case MCAST_LEAVE_GROUP:
1002 struct group_req greq;
1003 struct sockaddr_in *psin;
1004 struct ip_mreqn mreq;
1006 if (optlen < sizeof(struct group_req))
1009 if (copy_from_user(&greq, optval, sizeof(greq)))
1011 psin = (struct sockaddr_in *)&greq.gr_group;
1012 if (psin->sin_family != AF_INET)
1014 memset(&mreq, 0, sizeof(mreq));
1015 mreq.imr_multiaddr = psin->sin_addr;
1016 mreq.imr_ifindex = greq.gr_interface;
1018 if (optname == MCAST_JOIN_GROUP)
1019 err = ip_mc_join_group(sk, &mreq);
1021 err = ip_mc_leave_group(sk, &mreq);
1024 case MCAST_JOIN_SOURCE_GROUP:
1025 case MCAST_LEAVE_SOURCE_GROUP:
1026 case MCAST_BLOCK_SOURCE:
1027 case MCAST_UNBLOCK_SOURCE:
1029 struct group_source_req greqs;
1030 struct ip_mreq_source mreqs;
1031 struct sockaddr_in *psin;
1034 if (optlen != sizeof(struct group_source_req))
1036 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1040 if (greqs.gsr_group.ss_family != AF_INET ||
1041 greqs.gsr_source.ss_family != AF_INET) {
1042 err = -EADDRNOTAVAIL;
1045 psin = (struct sockaddr_in *)&greqs.gsr_group;
1046 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
1047 psin = (struct sockaddr_in *)&greqs.gsr_source;
1048 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
1049 mreqs.imr_interface = 0; /* use index for mc_source */
1051 if (optname == MCAST_BLOCK_SOURCE) {
1052 omode = MCAST_EXCLUDE;
1054 } else if (optname == MCAST_UNBLOCK_SOURCE) {
1055 omode = MCAST_EXCLUDE;
1057 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1058 struct ip_mreqn mreq;
1060 psin = (struct sockaddr_in *)&greqs.gsr_group;
1061 mreq.imr_multiaddr = psin->sin_addr;
1062 mreq.imr_address.s_addr = 0;
1063 mreq.imr_ifindex = greqs.gsr_interface;
1064 err = ip_mc_join_group(sk, &mreq);
1065 if (err && err != -EADDRINUSE)
1067 greqs.gsr_interface = mreq.imr_ifindex;
1068 omode = MCAST_INCLUDE;
1070 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1071 omode = MCAST_INCLUDE;
1074 err = ip_mc_source(add, omode, sk, &mreqs,
1075 greqs.gsr_interface);
1078 case MCAST_MSFILTER:
1080 struct sockaddr_in *psin;
1081 struct ip_msfilter *msf = NULL;
1082 struct group_filter *gsf = NULL;
1083 int msize, i, ifindex;
1085 if (optlen < GROUP_FILTER_SIZE(0))
1087 if (optlen > sysctl_optmem_max) {
1091 gsf = memdup_user(optval, optlen);
1097 /* numsrc >= (4G-140)/128 overflow in 32 bits */
1098 if (gsf->gf_numsrc >= 0x1ffffff ||
1099 gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
1103 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
1107 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
1108 msf = kmalloc(msize, GFP_KERNEL);
1113 ifindex = gsf->gf_interface;
1114 psin = (struct sockaddr_in *)&gsf->gf_group;
1115 if (psin->sin_family != AF_INET) {
1116 err = -EADDRNOTAVAIL;
1119 msf->imsf_multiaddr = psin->sin_addr.s_addr;
1120 msf->imsf_interface = 0;
1121 msf->imsf_fmode = gsf->gf_fmode;
1122 msf->imsf_numsrc = gsf->gf_numsrc;
1123 err = -EADDRNOTAVAIL;
1124 for (i = 0; i < gsf->gf_numsrc; ++i) {
1125 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
1127 if (psin->sin_family != AF_INET)
1129 msf->imsf_slist[i] = psin->sin_addr.s_addr;
1134 err = ip_mc_msfilter(sk, msf, ifindex);
1140 case IP_MULTICAST_ALL:
1143 if (val != 0 && val != 1)
1151 inet->freebind = !!val;
1154 case IP_IPSEC_POLICY:
1155 case IP_XFRM_POLICY:
1157 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1159 err = xfrm_user_policy(sk, optname, optval, optlen);
1162 case IP_TRANSPARENT:
1163 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1164 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1170 inet->transparent = !!val;
1176 if (val < 0 || val > 255)
1178 inet->min_ttl = val;
1198 * ipv4_pktinfo_prepare - transfer some info from rtable to skb
1202 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1203 * destination in skb->cb[] before dst drop.
1204 * This way, receiver doesn't make cache line misses to read rtable.
1206 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
1208 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1209 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1212 if (prepare && skb_rtable(skb)) {
1213 /* skb->cb is overloaded: prior to this point it is IP{6}CB
1214 * which has interface index (iif) as the first member of the
1215 * underlying inet{6}_skb_parm struct. This code then overlays
1216 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first
1217 * element so the iif is picked up from the prior IPCB. If iif
1218 * is the loopback interface, then return the sending interface
1219 * (e.g., process binds socket to eth0 for Tx which is
1220 * redirected to loopback in the rtable/dst).
1222 struct rtable *rt = skb_rtable(skb);
1223 bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags);
1225 if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX)
1226 pktinfo->ipi_ifindex = inet_iif(skb);
1227 else if (l3slave && rt && rt->rt_iif)
1228 pktinfo->ipi_ifindex = rt->rt_iif;
1230 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1232 pktinfo->ipi_ifindex = 0;
1233 pktinfo->ipi_spec_dst.s_addr = 0;
1238 int ip_setsockopt(struct sock *sk, int level,
1239 int optname, char __user *optval, unsigned int optlen)
1243 if (level != SOL_IP)
1244 return -ENOPROTOOPT;
1246 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1247 #ifdef CONFIG_NETFILTER
1248 /* we need to exclude all possible ENOPROTOOPTs except default case */
1249 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1250 optname != IP_IPSEC_POLICY &&
1251 optname != IP_XFRM_POLICY &&
1252 !ip_mroute_opt(optname))
1253 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1257 EXPORT_SYMBOL(ip_setsockopt);
1259 #ifdef CONFIG_COMPAT
1260 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1261 char __user *optval, unsigned int optlen)
1265 if (level != SOL_IP)
1266 return -ENOPROTOOPT;
1268 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1269 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1272 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1273 #ifdef CONFIG_NETFILTER
1274 /* we need to exclude all possible ENOPROTOOPTs except default case */
1275 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1276 optname != IP_IPSEC_POLICY &&
1277 optname != IP_XFRM_POLICY &&
1278 !ip_mroute_opt(optname))
1279 err = compat_nf_setsockopt(sk, PF_INET, optname, optval,
1284 EXPORT_SYMBOL(compat_ip_setsockopt);
1288 * Get the options. Note for future reference. The GET of IP options gets
1289 * the _received_ ones. The set sets the _sent_ ones.
1292 static bool getsockopt_needs_rtnl(int optname)
1296 case MCAST_MSFILTER:
1302 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1303 char __user *optval, int __user *optlen, unsigned int flags)
1305 struct inet_sock *inet = inet_sk(sk);
1306 bool needs_rtnl = getsockopt_needs_rtnl(optname);
1310 if (level != SOL_IP)
1313 if (ip_mroute_opt(optname))
1314 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1316 if (get_user(len, optlen))
1328 unsigned char optbuf[sizeof(struct ip_options)+40];
1329 struct ip_options *opt = (struct ip_options *)optbuf;
1330 struct ip_options_rcu *inet_opt;
1332 inet_opt = rcu_dereference_protected(inet->inet_opt,
1333 lockdep_sock_is_held(sk));
1336 memcpy(optbuf, &inet_opt->opt,
1337 sizeof(struct ip_options) +
1338 inet_opt->opt.optlen);
1341 if (opt->optlen == 0)
1342 return put_user(0, optlen);
1344 ip_options_undo(opt);
1346 len = min_t(unsigned int, len, opt->optlen);
1347 if (put_user(len, optlen))
1349 if (copy_to_user(optval, opt->__data, len))
1354 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1357 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1360 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1363 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1366 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1369 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1371 case IP_RECVORIGDSTADDR:
1372 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1375 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;
1377 case IP_RECVFRAGSIZE:
1378 val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0;
1385 struct net *net = sock_net(sk);
1386 val = (inet->uc_ttl == -1 ?
1387 net->ipv4.sysctl_ip_default_ttl :
1392 val = inet->hdrincl;
1395 val = inet->nodefrag;
1397 case IP_BIND_ADDRESS_NO_PORT:
1398 val = inet->bind_address_no_port;
1400 case IP_MTU_DISCOVER:
1401 val = inet->pmtudisc;
1405 struct dst_entry *dst;
1407 dst = sk_dst_get(sk);
1419 val = inet->recverr;
1421 case IP_MULTICAST_TTL:
1424 case IP_MULTICAST_LOOP:
1425 val = inet->mc_loop;
1428 val = (__force int)htonl((__u32) inet->uc_index);
1430 case IP_MULTICAST_IF:
1432 struct in_addr addr;
1433 len = min_t(unsigned int, len, sizeof(struct in_addr));
1434 addr.s_addr = inet->mc_addr;
1437 if (put_user(len, optlen))
1439 if (copy_to_user(optval, &addr, len))
1445 struct ip_msfilter msf;
1447 if (len < IP_MSFILTER_SIZE(0)) {
1451 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1455 err = ip_mc_msfget(sk, &msf,
1456 (struct ip_msfilter __user *)optval, optlen);
1459 case MCAST_MSFILTER:
1461 struct group_filter gsf;
1463 if (len < GROUP_FILTER_SIZE(0)) {
1467 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1471 err = ip_mc_gsfget(sk, &gsf,
1472 (struct group_filter __user *)optval,
1476 case IP_MULTICAST_ALL:
1485 if (sk->sk_type != SOCK_STREAM)
1486 return -ENOPROTOOPT;
1488 msg.msg_control = (__force void *) optval;
1489 msg.msg_controllen = len;
1490 msg.msg_flags = flags;
1492 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1493 struct in_pktinfo info;
1495 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1496 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1497 info.ipi_ifindex = inet->mc_index;
1498 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1500 if (inet->cmsg_flags & IP_CMSG_TTL) {
1501 int hlim = inet->mc_ttl;
1502 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1504 if (inet->cmsg_flags & IP_CMSG_TOS) {
1505 int tos = inet->rcv_tos;
1506 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1508 len -= msg.msg_controllen;
1509 return put_user(len, optlen);
1512 val = inet->freebind;
1514 case IP_TRANSPARENT:
1515 val = inet->transparent;
1518 val = inet->min_ttl;
1522 return -ENOPROTOOPT;
1526 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1527 unsigned char ucval = (unsigned char)val;
1529 if (put_user(len, optlen))
1531 if (copy_to_user(optval, &ucval, 1))
1534 len = min_t(unsigned int, sizeof(int), len);
1535 if (put_user(len, optlen))
1537 if (copy_to_user(optval, &val, len))
1549 int ip_getsockopt(struct sock *sk, int level,
1550 int optname, char __user *optval, int __user *optlen)
1554 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1555 #ifdef CONFIG_NETFILTER
1556 /* we need to exclude all possible ENOPROTOOPTs except default case */
1557 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1558 !ip_mroute_opt(optname)) {
1561 if (get_user(len, optlen))
1564 err = nf_getsockopt(sk, PF_INET, optname, optval, &len);
1566 err = put_user(len, optlen);
1572 EXPORT_SYMBOL(ip_getsockopt);
1574 #ifdef CONFIG_COMPAT
1575 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1576 char __user *optval, int __user *optlen)
1580 if (optname == MCAST_MSFILTER)
1581 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1584 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1587 #ifdef CONFIG_NETFILTER
1588 /* we need to exclude all possible ENOPROTOOPTs except default case */
1589 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1590 !ip_mroute_opt(optname)) {
1593 if (get_user(len, optlen))
1596 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1598 err = put_user(len, optlen);
1604 EXPORT_SYMBOL(compat_ip_getsockopt);