2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
11 * Many : Split from ip.c , see ip.c for history.
12 * Martin Mares : TOS setting fixed.
13 * Alan Cox : Fixed a couple of oopses in Martin's
15 * Mike McLagan : Routing by source
18 #include <linux/module.h>
19 #include <linux/types.h>
21 #include <linux/skbuff.h>
23 #include <linux/icmp.h>
24 #include <linux/inetdevice.h>
25 #include <linux/netdevice.h>
26 #include <linux/slab.h>
30 #include <net/tcp_states.h>
31 #include <linux/udp.h>
32 #include <linux/igmp.h>
33 #include <linux/netfilter.h>
34 #include <linux/route.h>
35 #include <linux/mroute.h>
36 #include <net/inet_ecn.h>
37 #include <net/route.h>
39 #include <net/compat.h>
40 #include <net/checksum.h>
41 #if IS_ENABLED(CONFIG_IPV6)
42 #include <net/transp_v6.h>
44 #include <net/ip_fib.h>
46 #include <linux/errqueue.h>
47 #include <linux/uaccess.h>
50 * SOL_IP control messages.
53 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
55 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
57 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
59 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
62 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
64 int ttl = ip_hdr(skb)->ttl;
65 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
68 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
70 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
73 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
75 if (IPCB(skb)->opt.optlen == 0)
78 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
83 static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg,
86 unsigned char optbuf[sizeof(struct ip_options) + 40];
87 struct ip_options *opt = (struct ip_options *)optbuf;
89 if (IPCB(skb)->opt.optlen == 0)
92 if (ip_options_echo(net, opt, skb)) {
93 msg->msg_flags |= MSG_CTRUNC;
98 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
101 static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb)
105 if (IPCB(skb)->frag_max_size == 0)
108 val = IPCB(skb)->frag_max_size;
109 put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val);
112 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
113 int tlen, int offset)
115 __wsum csum = skb->csum;
117 if (skb->ip_summed != CHECKSUM_COMPLETE)
121 int tend_off = skb_transport_offset(skb) + tlen;
122 csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0));
125 put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
128 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
134 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
138 err = security_secid_to_secctx(secid, &secdata, &seclen);
142 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
143 security_release_secctx(secdata, seclen);
146 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
148 struct sockaddr_in sin;
149 const struct iphdr *iph = ip_hdr(skb);
150 __be16 *ports = (__be16 *)skb_transport_header(skb);
152 if (skb_transport_offset(skb) + 4 > (int)skb->len)
155 /* All current transport protocols have the port numbers in the
156 * first four bytes of the transport header and this function is
157 * written with this assumption in mind.
160 sin.sin_family = AF_INET;
161 sin.sin_addr.s_addr = iph->daddr;
162 sin.sin_port = ports[1];
163 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
165 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
168 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
169 struct sk_buff *skb, int tlen, int offset)
171 struct inet_sock *inet = inet_sk(sk);
172 unsigned int flags = inet->cmsg_flags;
174 /* Ordered by supposed usage frequency */
175 if (flags & IP_CMSG_PKTINFO) {
176 ip_cmsg_recv_pktinfo(msg, skb);
178 flags &= ~IP_CMSG_PKTINFO;
183 if (flags & IP_CMSG_TTL) {
184 ip_cmsg_recv_ttl(msg, skb);
186 flags &= ~IP_CMSG_TTL;
191 if (flags & IP_CMSG_TOS) {
192 ip_cmsg_recv_tos(msg, skb);
194 flags &= ~IP_CMSG_TOS;
199 if (flags & IP_CMSG_RECVOPTS) {
200 ip_cmsg_recv_opts(msg, skb);
202 flags &= ~IP_CMSG_RECVOPTS;
207 if (flags & IP_CMSG_RETOPTS) {
208 ip_cmsg_recv_retopts(sock_net(sk), msg, skb);
210 flags &= ~IP_CMSG_RETOPTS;
215 if (flags & IP_CMSG_PASSSEC) {
216 ip_cmsg_recv_security(msg, skb);
218 flags &= ~IP_CMSG_PASSSEC;
223 if (flags & IP_CMSG_ORIGDSTADDR) {
224 ip_cmsg_recv_dstaddr(msg, skb);
226 flags &= ~IP_CMSG_ORIGDSTADDR;
231 if (flags & IP_CMSG_CHECKSUM)
232 ip_cmsg_recv_checksum(msg, skb, tlen, offset);
234 if (flags & IP_CMSG_RECVFRAGSIZE)
235 ip_cmsg_recv_fragsize(msg, skb);
237 EXPORT_SYMBOL(ip_cmsg_recv_offset);
239 int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc,
243 struct cmsghdr *cmsg;
244 struct net *net = sock_net(sk);
246 for_each_cmsghdr(cmsg, msg) {
247 if (!CMSG_OK(msg, cmsg))
249 #if IS_ENABLED(CONFIG_IPV6)
251 cmsg->cmsg_level == SOL_IPV6 &&
252 cmsg->cmsg_type == IPV6_PKTINFO) {
253 struct in6_pktinfo *src_info;
255 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
257 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
258 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
260 ipc->oif = src_info->ipi6_ifindex;
261 ipc->addr = src_info->ipi6_addr.s6_addr32[3];
265 if (cmsg->cmsg_level == SOL_SOCKET) {
266 err = __sock_cmsg_send(sk, msg, cmsg, &ipc->sockc);
272 if (cmsg->cmsg_level != SOL_IP)
274 switch (cmsg->cmsg_type) {
276 err = cmsg->cmsg_len - sizeof(struct cmsghdr);
278 /* Our caller is responsible for freeing ipc->opt */
279 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
280 err < 40 ? err : 40);
286 struct in_pktinfo *info;
287 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
289 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
290 ipc->oif = info->ipi_ifindex;
291 ipc->addr = info->ipi_spec_dst.s_addr;
295 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
297 val = *(int *)CMSG_DATA(cmsg);
298 if (val < 1 || val > 255)
303 if (cmsg->cmsg_len == CMSG_LEN(sizeof(int)))
304 val = *(int *)CMSG_DATA(cmsg);
305 else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8)))
306 val = *(u8 *)CMSG_DATA(cmsg);
309 if (val < 0 || val > 255)
312 ipc->priority = rt_tos2priority(ipc->tos);
323 /* Special input handler for packets caught by router alert option.
324 They are selected only by protocol field, and then processed likely
325 local ones; but only if someone wants them! Otherwise, router
326 not running rsvpd will kill RSVP.
328 It is user level problem, what it will make with them.
329 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
330 but receiver should be enough clever f.e. to forward mtrace requests,
331 sent to multicast group to reach destination designated router.
333 struct ip_ra_chain __rcu *ip_ra_chain;
336 static void ip_ra_destroy_rcu(struct rcu_head *head)
338 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
340 sock_put(ra->saved_sk);
344 int ip_ra_control(struct sock *sk, unsigned char on,
345 void (*destructor)(struct sock *))
347 struct ip_ra_chain *ra, *new_ra;
348 struct ip_ra_chain __rcu **rap;
350 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
353 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
355 for (rap = &ip_ra_chain;
356 (ra = rtnl_dereference(*rap)) != NULL;
363 /* dont let ip_call_ra_chain() use sk again */
365 RCU_INIT_POINTER(*rap, ra->next);
370 * Delay sock_put(sk) and kfree(ra) after one rcu grace
371 * period. This guarantee ip_call_ra_chain() dont need
372 * to mess with socket refcounts.
375 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
382 new_ra->destructor = destructor;
384 RCU_INIT_POINTER(new_ra->next, ra);
385 rcu_assign_pointer(*rap, new_ra);
391 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
392 __be16 port, u32 info, u8 *payload)
394 struct sock_exterr_skb *serr;
396 skb = skb_clone(skb, GFP_ATOMIC);
400 serr = SKB_EXT_ERR(skb);
401 serr->ee.ee_errno = err;
402 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
403 serr->ee.ee_type = icmp_hdr(skb)->type;
404 serr->ee.ee_code = icmp_hdr(skb)->code;
406 serr->ee.ee_info = info;
407 serr->ee.ee_data = 0;
408 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
409 skb_network_header(skb);
412 if (skb_pull(skb, payload - skb->data)) {
413 skb_reset_transport_header(skb);
414 if (sock_queue_err_skb(sk, skb) == 0)
420 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
422 struct inet_sock *inet = inet_sk(sk);
423 struct sock_exterr_skb *serr;
430 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
434 skb_put(skb, sizeof(struct iphdr));
435 skb_reset_network_header(skb);
439 serr = SKB_EXT_ERR(skb);
440 serr->ee.ee_errno = err;
441 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
442 serr->ee.ee_type = 0;
443 serr->ee.ee_code = 0;
445 serr->ee.ee_info = info;
446 serr->ee.ee_data = 0;
447 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
450 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
451 skb_reset_transport_header(skb);
453 if (sock_queue_err_skb(sk, skb))
457 /* For some errors we have valid addr_offset even with zero payload and
458 * zero port. Also, addr_offset should be supported if port is set.
460 static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
462 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
463 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
466 /* IPv4 supports cmsg on all imcp errors and some timestamps
468 * Timestamp code paths do not initialize the fields expected by cmsg:
469 * the PKTINFO fields in skb->cb[]. Fill those in here.
471 static bool ipv4_datagram_support_cmsg(const struct sock *sk,
475 struct in_pktinfo *info;
477 if (ee_origin == SO_EE_ORIGIN_ICMP)
480 if (ee_origin == SO_EE_ORIGIN_LOCAL)
483 /* Support IP_PKTINFO on tstamp packets if requested, to correlate
484 * timestamp with egress dev. Not possible for packets without iif
485 * or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
487 info = PKTINFO_SKB_CB(skb);
488 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG) ||
492 info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
497 * Handle MSG_ERRQUEUE
499 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
501 struct sock_exterr_skb *serr;
503 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
505 struct sock_extended_err ee;
506 struct sockaddr_in offender;
511 WARN_ON_ONCE(sk->sk_family == AF_INET6);
514 skb = sock_dequeue_err_skb(sk);
520 msg->msg_flags |= MSG_TRUNC;
523 err = skb_copy_datagram_msg(skb, 0, msg, copied);
528 sock_recv_timestamp(msg, sk, skb);
530 serr = SKB_EXT_ERR(skb);
532 if (sin && ipv4_datagram_support_addr(serr)) {
533 sin->sin_family = AF_INET;
534 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
536 sin->sin_port = serr->port;
537 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
538 *addr_len = sizeof(*sin);
541 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
542 sin = &errhdr.offender;
543 memset(sin, 0, sizeof(*sin));
545 if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
546 sin->sin_family = AF_INET;
547 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
548 if (inet_sk(sk)->cmsg_flags)
549 ip_cmsg_recv(msg, skb);
552 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
554 /* Now we could try to dump offended packet options */
556 msg->msg_flags |= MSG_ERRQUEUE;
566 * Socket option code for IP. This is the end of the line after any
567 * TCP,UDP etc options on an IP socket.
569 static bool setsockopt_needs_rtnl(int optname)
572 case IP_ADD_MEMBERSHIP:
573 case IP_ADD_SOURCE_MEMBERSHIP:
574 case IP_BLOCK_SOURCE:
575 case IP_DROP_MEMBERSHIP:
576 case IP_DROP_SOURCE_MEMBERSHIP:
578 case IP_UNBLOCK_SOURCE:
579 case MCAST_BLOCK_SOURCE:
581 case MCAST_JOIN_GROUP:
582 case MCAST_JOIN_SOURCE_GROUP:
583 case MCAST_LEAVE_GROUP:
584 case MCAST_LEAVE_SOURCE_GROUP:
585 case MCAST_UNBLOCK_SOURCE:
586 case IP_ROUTER_ALERT:
592 static int do_ip_setsockopt(struct sock *sk, int level,
593 int optname, char __user *optval, unsigned int optlen)
595 struct inet_sock *inet = inet_sk(sk);
596 struct net *net = sock_net(sk);
598 bool needs_rtnl = setsockopt_needs_rtnl(optname);
609 case IP_MTU_DISCOVER:
611 case IP_ROUTER_ALERT:
617 case IP_BIND_ADDRESS_NO_PORT:
619 case IP_MULTICAST_TTL:
620 case IP_MULTICAST_ALL:
621 case IP_MULTICAST_LOOP:
622 case IP_RECVORIGDSTADDR:
624 case IP_RECVFRAGSIZE:
625 if (optlen >= sizeof(int)) {
626 if (get_user(val, (int __user *) optval))
628 } else if (optlen >= sizeof(char)) {
631 if (get_user(ucval, (unsigned char __user *) optval))
637 /* If optlen==0, it is equivalent to val == 0 */
639 if (ip_mroute_opt(optname))
640 return ip_mroute_setsockopt(sk, optname, optval, optlen);
650 struct ip_options_rcu *old, *opt = NULL;
654 err = ip_options_get_from_user(sock_net(sk), &opt,
658 old = rcu_dereference_protected(inet->inet_opt,
659 lockdep_sock_is_held(sk));
661 struct inet_connection_sock *icsk = inet_csk(sk);
662 #if IS_ENABLED(CONFIG_IPV6)
663 if (sk->sk_family == PF_INET ||
664 (!((1 << sk->sk_state) &
665 (TCPF_LISTEN | TCPF_CLOSE)) &&
666 inet->inet_daddr != LOOPBACK4_IPV6)) {
669 icsk->icsk_ext_hdr_len -= old->opt.optlen;
671 icsk->icsk_ext_hdr_len += opt->opt.optlen;
672 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
673 #if IS_ENABLED(CONFIG_IPV6)
677 rcu_assign_pointer(inet->inet_opt, opt);
684 inet->cmsg_flags |= IP_CMSG_PKTINFO;
686 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
690 inet->cmsg_flags |= IP_CMSG_TTL;
692 inet->cmsg_flags &= ~IP_CMSG_TTL;
696 inet->cmsg_flags |= IP_CMSG_TOS;
698 inet->cmsg_flags &= ~IP_CMSG_TOS;
702 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
704 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
708 inet->cmsg_flags |= IP_CMSG_RETOPTS;
710 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
714 inet->cmsg_flags |= IP_CMSG_PASSSEC;
716 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
718 case IP_RECVORIGDSTADDR:
720 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
722 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
726 if (!(inet->cmsg_flags & IP_CMSG_CHECKSUM)) {
727 inet_inc_convert_csum(sk);
728 inet->cmsg_flags |= IP_CMSG_CHECKSUM;
731 if (inet->cmsg_flags & IP_CMSG_CHECKSUM) {
732 inet_dec_convert_csum(sk);
733 inet->cmsg_flags &= ~IP_CMSG_CHECKSUM;
737 case IP_RECVFRAGSIZE:
738 if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM)
741 inet->cmsg_flags |= IP_CMSG_RECVFRAGSIZE;
743 inet->cmsg_flags &= ~IP_CMSG_RECVFRAGSIZE;
745 case IP_TOS: /* This sets both TOS and Precedence */
746 if (sk->sk_type == SOCK_STREAM) {
747 val &= ~INET_ECN_MASK;
748 val |= inet->tos & INET_ECN_MASK;
750 if (inet->tos != val) {
752 sk->sk_priority = rt_tos2priority(val);
759 if (val != -1 && (val < 1 || val > 255))
764 if (sk->sk_type != SOCK_RAW) {
768 inet->hdrincl = val ? 1 : 0;
771 if (sk->sk_type != SOCK_RAW) {
775 inet->nodefrag = val ? 1 : 0;
777 case IP_BIND_ADDRESS_NO_PORT:
778 inet->bind_address_no_port = val ? 1 : 0;
780 case IP_MTU_DISCOVER:
781 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
783 inet->pmtudisc = val;
786 inet->recverr = !!val;
788 skb_queue_purge(&sk->sk_error_queue);
790 case IP_MULTICAST_TTL:
791 if (sk->sk_type == SOCK_STREAM)
797 if (val < 0 || val > 255)
801 case IP_MULTICAST_LOOP:
804 inet->mc_loop = !!val;
808 struct net_device *dev = NULL;
811 if (optlen != sizeof(int))
814 ifindex = (__force int)ntohl((__force __be32)val);
821 dev = dev_get_by_index(sock_net(sk), ifindex);
822 err = -EADDRNOTAVAIL;
828 if (sk->sk_bound_dev_if)
831 inet->uc_index = ifindex;
835 case IP_MULTICAST_IF:
837 struct ip_mreqn mreq;
838 struct net_device *dev = NULL;
841 if (sk->sk_type == SOCK_STREAM)
844 * Check the arguments are allowable
847 if (optlen < sizeof(struct in_addr))
851 if (optlen >= sizeof(struct ip_mreqn)) {
852 if (copy_from_user(&mreq, optval, sizeof(mreq)))
855 memset(&mreq, 0, sizeof(mreq));
856 if (optlen >= sizeof(struct ip_mreq)) {
857 if (copy_from_user(&mreq, optval,
858 sizeof(struct ip_mreq)))
860 } else if (optlen >= sizeof(struct in_addr)) {
861 if (copy_from_user(&mreq.imr_address, optval,
862 sizeof(struct in_addr)))
867 if (!mreq.imr_ifindex) {
868 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
874 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
876 mreq.imr_ifindex = dev->ifindex;
878 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
881 err = -EADDRNOTAVAIL;
885 midx = l3mdev_master_ifindex(dev);
890 if (sk->sk_bound_dev_if &&
891 mreq.imr_ifindex != sk->sk_bound_dev_if &&
892 (!midx || midx != sk->sk_bound_dev_if))
895 inet->mc_index = mreq.imr_ifindex;
896 inet->mc_addr = mreq.imr_address.s_addr;
901 case IP_ADD_MEMBERSHIP:
902 case IP_DROP_MEMBERSHIP:
904 struct ip_mreqn mreq;
907 if (inet_sk(sk)->is_icsk)
910 if (optlen < sizeof(struct ip_mreq))
913 if (optlen >= sizeof(struct ip_mreqn)) {
914 if (copy_from_user(&mreq, optval, sizeof(mreq)))
917 memset(&mreq, 0, sizeof(mreq));
918 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
922 if (optname == IP_ADD_MEMBERSHIP)
923 err = ip_mc_join_group(sk, &mreq);
925 err = ip_mc_leave_group(sk, &mreq);
930 struct ip_msfilter *msf;
932 if (optlen < IP_MSFILTER_SIZE(0))
934 if (optlen > sysctl_optmem_max) {
938 msf = memdup_user(optval, optlen);
943 /* numsrc >= (1G-4) overflow in 32 bits */
944 if (msf->imsf_numsrc >= 0x3ffffffcU ||
945 msf->imsf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
950 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
955 err = ip_mc_msfilter(sk, msf, 0);
959 case IP_BLOCK_SOURCE:
960 case IP_UNBLOCK_SOURCE:
961 case IP_ADD_SOURCE_MEMBERSHIP:
962 case IP_DROP_SOURCE_MEMBERSHIP:
964 struct ip_mreq_source mreqs;
967 if (optlen != sizeof(struct ip_mreq_source))
969 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
973 if (optname == IP_BLOCK_SOURCE) {
974 omode = MCAST_EXCLUDE;
976 } else if (optname == IP_UNBLOCK_SOURCE) {
977 omode = MCAST_EXCLUDE;
979 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
980 struct ip_mreqn mreq;
982 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
983 mreq.imr_address.s_addr = mreqs.imr_interface;
984 mreq.imr_ifindex = 0;
985 err = ip_mc_join_group(sk, &mreq);
986 if (err && err != -EADDRINUSE)
988 omode = MCAST_INCLUDE;
990 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
991 omode = MCAST_INCLUDE;
994 err = ip_mc_source(add, omode, sk, &mreqs, 0);
997 case MCAST_JOIN_GROUP:
998 case MCAST_LEAVE_GROUP:
1000 struct group_req greq;
1001 struct sockaddr_in *psin;
1002 struct ip_mreqn mreq;
1004 if (optlen < sizeof(struct group_req))
1007 if (copy_from_user(&greq, optval, sizeof(greq)))
1009 psin = (struct sockaddr_in *)&greq.gr_group;
1010 if (psin->sin_family != AF_INET)
1012 memset(&mreq, 0, sizeof(mreq));
1013 mreq.imr_multiaddr = psin->sin_addr;
1014 mreq.imr_ifindex = greq.gr_interface;
1016 if (optname == MCAST_JOIN_GROUP)
1017 err = ip_mc_join_group(sk, &mreq);
1019 err = ip_mc_leave_group(sk, &mreq);
1022 case MCAST_JOIN_SOURCE_GROUP:
1023 case MCAST_LEAVE_SOURCE_GROUP:
1024 case MCAST_BLOCK_SOURCE:
1025 case MCAST_UNBLOCK_SOURCE:
1027 struct group_source_req greqs;
1028 struct ip_mreq_source mreqs;
1029 struct sockaddr_in *psin;
1032 if (optlen != sizeof(struct group_source_req))
1034 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
1038 if (greqs.gsr_group.ss_family != AF_INET ||
1039 greqs.gsr_source.ss_family != AF_INET) {
1040 err = -EADDRNOTAVAIL;
1043 psin = (struct sockaddr_in *)&greqs.gsr_group;
1044 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
1045 psin = (struct sockaddr_in *)&greqs.gsr_source;
1046 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
1047 mreqs.imr_interface = 0; /* use index for mc_source */
1049 if (optname == MCAST_BLOCK_SOURCE) {
1050 omode = MCAST_EXCLUDE;
1052 } else if (optname == MCAST_UNBLOCK_SOURCE) {
1053 omode = MCAST_EXCLUDE;
1055 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
1056 struct ip_mreqn mreq;
1058 psin = (struct sockaddr_in *)&greqs.gsr_group;
1059 mreq.imr_multiaddr = psin->sin_addr;
1060 mreq.imr_address.s_addr = 0;
1061 mreq.imr_ifindex = greqs.gsr_interface;
1062 err = ip_mc_join_group(sk, &mreq);
1063 if (err && err != -EADDRINUSE)
1065 greqs.gsr_interface = mreq.imr_ifindex;
1066 omode = MCAST_INCLUDE;
1068 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
1069 omode = MCAST_INCLUDE;
1072 err = ip_mc_source(add, omode, sk, &mreqs,
1073 greqs.gsr_interface);
1076 case MCAST_MSFILTER:
1078 struct sockaddr_in *psin;
1079 struct ip_msfilter *msf = NULL;
1080 struct group_filter *gsf = NULL;
1081 int msize, i, ifindex;
1083 if (optlen < GROUP_FILTER_SIZE(0))
1085 if (optlen > sysctl_optmem_max) {
1089 gsf = memdup_user(optval, optlen);
1095 /* numsrc >= (4G-140)/128 overflow in 32 bits */
1096 if (gsf->gf_numsrc >= 0x1ffffff ||
1097 gsf->gf_numsrc > net->ipv4.sysctl_igmp_max_msf) {
1101 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
1105 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
1106 msf = kmalloc(msize, GFP_KERNEL);
1111 ifindex = gsf->gf_interface;
1112 psin = (struct sockaddr_in *)&gsf->gf_group;
1113 if (psin->sin_family != AF_INET) {
1114 err = -EADDRNOTAVAIL;
1117 msf->imsf_multiaddr = psin->sin_addr.s_addr;
1118 msf->imsf_interface = 0;
1119 msf->imsf_fmode = gsf->gf_fmode;
1120 msf->imsf_numsrc = gsf->gf_numsrc;
1121 err = -EADDRNOTAVAIL;
1122 for (i = 0; i < gsf->gf_numsrc; ++i) {
1123 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
1125 if (psin->sin_family != AF_INET)
1127 msf->imsf_slist[i] = psin->sin_addr.s_addr;
1132 err = ip_mc_msfilter(sk, msf, ifindex);
1138 case IP_MULTICAST_ALL:
1141 if (val != 0 && val != 1)
1145 case IP_ROUTER_ALERT:
1146 err = ip_ra_control(sk, val ? 1 : 0, NULL);
1152 inet->freebind = !!val;
1155 case IP_IPSEC_POLICY:
1156 case IP_XFRM_POLICY:
1158 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1160 err = xfrm_user_policy(sk, optname, optval, optlen);
1163 case IP_TRANSPARENT:
1164 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1165 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1171 inet->transparent = !!val;
1177 if (val < 0 || val > 255)
1179 inet->min_ttl = val;
1199 * ipv4_pktinfo_prepare - transfer some info from rtable to skb
1203 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1204 * destination in skb->cb[] before dst drop.
1205 * This way, receiver doesn't make cache line misses to read rtable.
1207 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
1209 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1210 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1213 if (prepare && skb_rtable(skb)) {
1214 /* skb->cb is overloaded: prior to this point it is IP{6}CB
1215 * which has interface index (iif) as the first member of the
1216 * underlying inet{6}_skb_parm struct. This code then overlays
1217 * PKTINFO_SKB_CB and in_pktinfo also has iif as the first
1218 * element so the iif is picked up from the prior IPCB. If iif
1219 * is the loopback interface, then return the sending interface
1220 * (e.g., process binds socket to eth0 for Tx which is
1221 * redirected to loopback in the rtable/dst).
1223 struct rtable *rt = skb_rtable(skb);
1224 bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags);
1226 if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX)
1227 pktinfo->ipi_ifindex = inet_iif(skb);
1228 else if (l3slave && rt && rt->rt_iif)
1229 pktinfo->ipi_ifindex = rt->rt_iif;
1231 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1233 pktinfo->ipi_ifindex = 0;
1234 pktinfo->ipi_spec_dst.s_addr = 0;
1239 int ip_setsockopt(struct sock *sk, int level,
1240 int optname, char __user *optval, unsigned int optlen)
1244 if (level != SOL_IP)
1245 return -ENOPROTOOPT;
1247 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1248 #ifdef CONFIG_NETFILTER
1249 /* we need to exclude all possible ENOPROTOOPTs except default case */
1250 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1251 optname != IP_IPSEC_POLICY &&
1252 optname != IP_XFRM_POLICY &&
1253 !ip_mroute_opt(optname)) {
1255 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1261 EXPORT_SYMBOL(ip_setsockopt);
1263 #ifdef CONFIG_COMPAT
1264 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1265 char __user *optval, unsigned int optlen)
1269 if (level != SOL_IP)
1270 return -ENOPROTOOPT;
1272 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1273 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1276 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1277 #ifdef CONFIG_NETFILTER
1278 /* we need to exclude all possible ENOPROTOOPTs except default case */
1279 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1280 optname != IP_IPSEC_POLICY &&
1281 optname != IP_XFRM_POLICY &&
1282 !ip_mroute_opt(optname)) {
1284 err = compat_nf_setsockopt(sk, PF_INET, optname,
1291 EXPORT_SYMBOL(compat_ip_setsockopt);
1295 * Get the options. Note for future reference. The GET of IP options gets
1296 * the _received_ ones. The set sets the _sent_ ones.
1299 static bool getsockopt_needs_rtnl(int optname)
1303 case MCAST_MSFILTER:
1309 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1310 char __user *optval, int __user *optlen, unsigned int flags)
1312 struct inet_sock *inet = inet_sk(sk);
1313 bool needs_rtnl = getsockopt_needs_rtnl(optname);
1317 if (level != SOL_IP)
1320 if (ip_mroute_opt(optname))
1321 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1323 if (get_user(len, optlen))
1335 unsigned char optbuf[sizeof(struct ip_options)+40];
1336 struct ip_options *opt = (struct ip_options *)optbuf;
1337 struct ip_options_rcu *inet_opt;
1339 inet_opt = rcu_dereference_protected(inet->inet_opt,
1340 lockdep_sock_is_held(sk));
1343 memcpy(optbuf, &inet_opt->opt,
1344 sizeof(struct ip_options) +
1345 inet_opt->opt.optlen);
1348 if (opt->optlen == 0)
1349 return put_user(0, optlen);
1351 ip_options_undo(opt);
1353 len = min_t(unsigned int, len, opt->optlen);
1354 if (put_user(len, optlen))
1356 if (copy_to_user(optval, opt->__data, len))
1361 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1364 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1367 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1370 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1373 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1376 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1378 case IP_RECVORIGDSTADDR:
1379 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1382 val = (inet->cmsg_flags & IP_CMSG_CHECKSUM) != 0;
1384 case IP_RECVFRAGSIZE:
1385 val = (inet->cmsg_flags & IP_CMSG_RECVFRAGSIZE) != 0;
1392 struct net *net = sock_net(sk);
1393 val = (inet->uc_ttl == -1 ?
1394 net->ipv4.sysctl_ip_default_ttl :
1399 val = inet->hdrincl;
1402 val = inet->nodefrag;
1404 case IP_BIND_ADDRESS_NO_PORT:
1405 val = inet->bind_address_no_port;
1407 case IP_MTU_DISCOVER:
1408 val = inet->pmtudisc;
1412 struct dst_entry *dst;
1414 dst = sk_dst_get(sk);
1426 val = inet->recverr;
1428 case IP_MULTICAST_TTL:
1431 case IP_MULTICAST_LOOP:
1432 val = inet->mc_loop;
1435 val = (__force int)htonl((__u32) inet->uc_index);
1437 case IP_MULTICAST_IF:
1439 struct in_addr addr;
1440 len = min_t(unsigned int, len, sizeof(struct in_addr));
1441 addr.s_addr = inet->mc_addr;
1444 if (put_user(len, optlen))
1446 if (copy_to_user(optval, &addr, len))
1452 struct ip_msfilter msf;
1454 if (len < IP_MSFILTER_SIZE(0)) {
1458 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1462 err = ip_mc_msfget(sk, &msf,
1463 (struct ip_msfilter __user *)optval, optlen);
1466 case MCAST_MSFILTER:
1468 struct group_filter gsf;
1470 if (len < GROUP_FILTER_SIZE(0)) {
1474 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1478 err = ip_mc_gsfget(sk, &gsf,
1479 (struct group_filter __user *)optval,
1483 case IP_MULTICAST_ALL:
1492 if (sk->sk_type != SOCK_STREAM)
1493 return -ENOPROTOOPT;
1495 msg.msg_control = (__force void *) optval;
1496 msg.msg_controllen = len;
1497 msg.msg_flags = flags;
1499 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1500 struct in_pktinfo info;
1502 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1503 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1504 info.ipi_ifindex = inet->mc_index;
1505 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1507 if (inet->cmsg_flags & IP_CMSG_TTL) {
1508 int hlim = inet->mc_ttl;
1509 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1511 if (inet->cmsg_flags & IP_CMSG_TOS) {
1512 int tos = inet->rcv_tos;
1513 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1515 len -= msg.msg_controllen;
1516 return put_user(len, optlen);
1519 val = inet->freebind;
1521 case IP_TRANSPARENT:
1522 val = inet->transparent;
1525 val = inet->min_ttl;
1529 return -ENOPROTOOPT;
1533 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1534 unsigned char ucval = (unsigned char)val;
1536 if (put_user(len, optlen))
1538 if (copy_to_user(optval, &ucval, 1))
1541 len = min_t(unsigned int, sizeof(int), len);
1542 if (put_user(len, optlen))
1544 if (copy_to_user(optval, &val, len))
1556 int ip_getsockopt(struct sock *sk, int level,
1557 int optname, char __user *optval, int __user *optlen)
1561 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1562 #ifdef CONFIG_NETFILTER
1563 /* we need to exclude all possible ENOPROTOOPTs except default case */
1564 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1565 !ip_mroute_opt(optname)) {
1568 if (get_user(len, optlen))
1572 err = nf_getsockopt(sk, PF_INET, optname, optval,
1576 err = put_user(len, optlen);
1582 EXPORT_SYMBOL(ip_getsockopt);
1584 #ifdef CONFIG_COMPAT
1585 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1586 char __user *optval, int __user *optlen)
1590 if (optname == MCAST_MSFILTER)
1591 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1594 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1597 #ifdef CONFIG_NETFILTER
1598 /* we need to exclude all possible ENOPROTOOPTs except default case */
1599 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1600 !ip_mroute_opt(optname)) {
1603 if (get_user(len, optlen))
1607 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1610 err = put_user(len, optlen);
1616 EXPORT_SYMBOL(compat_ip_getsockopt);