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 #if IS_ENABLED(CONFIG_IPV6)
41 #include <net/transp_v6.h>
44 #include <linux/errqueue.h>
45 #include <asm/uaccess.h>
47 #define IP_CMSG_PKTINFO 1
50 #define IP_CMSG_RECVOPTS 8
51 #define IP_CMSG_RETOPTS 16
52 #define IP_CMSG_PASSSEC 32
53 #define IP_CMSG_ORIGDSTADDR 64
56 * SOL_IP control messages.
58 #define PKTINFO_SKB_CB(__skb) ((struct in_pktinfo *)((__skb)->cb))
60 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
62 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
64 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
66 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
69 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
71 int ttl = ip_hdr(skb)->ttl;
72 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
75 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
77 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
80 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
82 if (IPCB(skb)->opt.optlen == 0)
85 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
90 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
92 unsigned char optbuf[sizeof(struct ip_options) + 40];
93 struct ip_options * opt = (struct ip_options *)optbuf;
95 if (IPCB(skb)->opt.optlen == 0)
98 if (ip_options_echo(opt, skb)) {
99 msg->msg_flags |= MSG_CTRUNC;
102 ip_options_undo(opt);
104 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
107 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
113 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
117 err = security_secid_to_secctx(secid, &secdata, &seclen);
121 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
122 security_release_secctx(secdata, seclen);
125 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
127 struct sockaddr_in sin;
128 const struct iphdr *iph = ip_hdr(skb);
129 __be16 *ports = (__be16 *)skb_transport_header(skb);
131 if (skb_transport_offset(skb) + 4 > skb->len)
134 /* All current transport protocols have the port numbers in the
135 * first four bytes of the transport header and this function is
136 * written with this assumption in mind.
139 sin.sin_family = AF_INET;
140 sin.sin_addr.s_addr = iph->daddr;
141 sin.sin_port = ports[1];
142 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
144 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
147 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
149 struct inet_sock *inet = inet_sk(skb->sk);
150 unsigned flags = inet->cmsg_flags;
152 /* Ordered by supposed usage frequency */
154 ip_cmsg_recv_pktinfo(msg, skb);
155 if ((flags >>= 1) == 0)
159 ip_cmsg_recv_ttl(msg, skb);
160 if ((flags >>= 1) == 0)
164 ip_cmsg_recv_tos(msg, skb);
165 if ((flags >>= 1) == 0)
169 ip_cmsg_recv_opts(msg, skb);
170 if ((flags >>= 1) == 0)
174 ip_cmsg_recv_retopts(msg, skb);
175 if ((flags >>= 1) == 0)
179 ip_cmsg_recv_security(msg, skb);
181 if ((flags >>= 1) == 0)
184 ip_cmsg_recv_dstaddr(msg, skb);
187 EXPORT_SYMBOL(ip_cmsg_recv);
189 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
192 struct cmsghdr *cmsg;
194 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
195 if (!CMSG_OK(msg, cmsg))
197 if (cmsg->cmsg_level != SOL_IP)
199 switch (cmsg->cmsg_type) {
201 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
202 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
203 err < 40 ? err : 40);
209 struct in_pktinfo *info;
210 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
212 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
213 ipc->oif = info->ipi_ifindex;
214 ipc->addr = info->ipi_spec_dst.s_addr;
225 /* Special input handler for packets caught by router alert option.
226 They are selected only by protocol field, and then processed likely
227 local ones; but only if someone wants them! Otherwise, router
228 not running rsvpd will kill RSVP.
230 It is user level problem, what it will make with them.
231 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
232 but receiver should be enough clever f.e. to forward mtrace requests,
233 sent to multicast group to reach destination designated router.
235 struct ip_ra_chain __rcu *ip_ra_chain;
236 static DEFINE_SPINLOCK(ip_ra_lock);
239 static void ip_ra_destroy_rcu(struct rcu_head *head)
241 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
243 sock_put(ra->saved_sk);
247 int ip_ra_control(struct sock *sk, unsigned char on,
248 void (*destructor)(struct sock *))
250 struct ip_ra_chain *ra, *new_ra;
251 struct ip_ra_chain __rcu **rap;
253 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
256 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
258 spin_lock_bh(&ip_ra_lock);
259 for (rap = &ip_ra_chain;
260 (ra = rcu_dereference_protected(*rap,
261 lockdep_is_held(&ip_ra_lock))) != NULL;
265 spin_unlock_bh(&ip_ra_lock);
269 /* dont let ip_call_ra_chain() use sk again */
271 rcu_assign_pointer(*rap, ra->next);
272 spin_unlock_bh(&ip_ra_lock);
277 * Delay sock_put(sk) and kfree(ra) after one rcu grace
278 * period. This guarantee ip_call_ra_chain() dont need
279 * to mess with socket refcounts.
282 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
286 if (new_ra == NULL) {
287 spin_unlock_bh(&ip_ra_lock);
291 new_ra->destructor = destructor;
294 rcu_assign_pointer(*rap, new_ra);
296 spin_unlock_bh(&ip_ra_lock);
301 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
302 __be16 port, u32 info, u8 *payload)
304 struct sock_exterr_skb *serr;
306 skb = skb_clone(skb, GFP_ATOMIC);
310 serr = SKB_EXT_ERR(skb);
311 serr->ee.ee_errno = err;
312 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
313 serr->ee.ee_type = icmp_hdr(skb)->type;
314 serr->ee.ee_code = icmp_hdr(skb)->code;
316 serr->ee.ee_info = info;
317 serr->ee.ee_data = 0;
318 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
319 skb_network_header(skb);
322 if (skb_pull(skb, payload - skb->data) != NULL) {
323 skb_reset_transport_header(skb);
324 if (sock_queue_err_skb(sk, skb) == 0)
330 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
332 struct inet_sock *inet = inet_sk(sk);
333 struct sock_exterr_skb *serr;
340 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
344 skb_put(skb, sizeof(struct iphdr));
345 skb_reset_network_header(skb);
349 serr = SKB_EXT_ERR(skb);
350 serr->ee.ee_errno = err;
351 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
352 serr->ee.ee_type = 0;
353 serr->ee.ee_code = 0;
355 serr->ee.ee_info = info;
356 serr->ee.ee_data = 0;
357 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
360 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
361 skb_reset_transport_header(skb);
363 if (sock_queue_err_skb(sk, skb))
368 * Handle MSG_ERRQUEUE
370 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
372 struct sock_exterr_skb *serr;
373 struct sk_buff *skb, *skb2;
374 struct sockaddr_in *sin;
376 struct sock_extended_err ee;
377 struct sockaddr_in offender;
383 skb = skb_dequeue(&sk->sk_error_queue);
389 msg->msg_flags |= MSG_TRUNC;
392 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
396 sock_recv_timestamp(msg, sk, skb);
398 serr = SKB_EXT_ERR(skb);
400 sin = (struct sockaddr_in *)msg->msg_name;
402 sin->sin_family = AF_INET;
403 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
405 sin->sin_port = serr->port;
406 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
409 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
410 sin = &errhdr.offender;
411 sin->sin_family = AF_UNSPEC;
412 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
413 struct inet_sock *inet = inet_sk(sk);
415 sin->sin_family = AF_INET;
416 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
418 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
419 if (inet->cmsg_flags)
420 ip_cmsg_recv(msg, skb);
423 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
425 /* Now we could try to dump offended packet options */
427 msg->msg_flags |= MSG_ERRQUEUE;
430 /* Reset and regenerate socket error */
431 spin_lock_bh(&sk->sk_error_queue.lock);
433 skb2 = skb_peek(&sk->sk_error_queue);
435 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
436 spin_unlock_bh(&sk->sk_error_queue.lock);
437 sk->sk_error_report(sk);
439 spin_unlock_bh(&sk->sk_error_queue.lock);
449 * Socket option code for IP. This is the end of the line after any
450 * TCP,UDP etc options on an IP socket.
453 static int do_ip_setsockopt(struct sock *sk, int level,
454 int optname, char __user *optval, unsigned int optlen)
456 struct inet_sock *inet = inet_sk(sk);
459 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
460 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
461 (1<<IP_RETOPTS) | (1<<IP_TOS) |
462 (1<<IP_TTL) | (1<<IP_HDRINCL) |
463 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
464 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
465 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) |
466 (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) ||
467 optname == IP_UNICAST_IF ||
468 optname == IP_MULTICAST_TTL ||
469 optname == IP_MULTICAST_ALL ||
470 optname == IP_MULTICAST_LOOP ||
471 optname == IP_RECVORIGDSTADDR) {
472 if (optlen >= sizeof(int)) {
473 if (get_user(val, (int __user *) optval))
475 } else if (optlen >= sizeof(char)) {
478 if (get_user(ucval, (unsigned char __user *) optval))
484 /* If optlen==0, it is equivalent to val == 0 */
486 if (ip_mroute_opt(optname))
487 return ip_mroute_setsockopt(sk, optname, optval, optlen);
495 struct ip_options_rcu *old, *opt = NULL;
499 err = ip_options_get_from_user(sock_net(sk), &opt,
503 old = rcu_dereference_protected(inet->inet_opt,
504 sock_owned_by_user(sk));
506 struct inet_connection_sock *icsk = inet_csk(sk);
507 #if IS_ENABLED(CONFIG_IPV6)
508 if (sk->sk_family == PF_INET ||
509 (!((1 << sk->sk_state) &
510 (TCPF_LISTEN | TCPF_CLOSE)) &&
511 inet->inet_daddr != LOOPBACK4_IPV6)) {
514 icsk->icsk_ext_hdr_len -= old->opt.optlen;
516 icsk->icsk_ext_hdr_len += opt->opt.optlen;
517 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
518 #if IS_ENABLED(CONFIG_IPV6)
522 rcu_assign_pointer(inet->inet_opt, opt);
529 inet->cmsg_flags |= IP_CMSG_PKTINFO;
531 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
535 inet->cmsg_flags |= IP_CMSG_TTL;
537 inet->cmsg_flags &= ~IP_CMSG_TTL;
541 inet->cmsg_flags |= IP_CMSG_TOS;
543 inet->cmsg_flags &= ~IP_CMSG_TOS;
547 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
549 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
553 inet->cmsg_flags |= IP_CMSG_RETOPTS;
555 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
559 inet->cmsg_flags |= IP_CMSG_PASSSEC;
561 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
563 case IP_RECVORIGDSTADDR:
565 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
567 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
569 case IP_TOS: /* This sets both TOS and Precedence */
570 if (sk->sk_type == SOCK_STREAM) {
571 val &= ~INET_ECN_MASK;
572 val |= inet->tos & INET_ECN_MASK;
574 if (inet->tos != val) {
576 sk->sk_priority = rt_tos2priority(val);
583 if (val != -1 && (val < 0 || val > 255))
588 if (sk->sk_type != SOCK_RAW) {
592 inet->hdrincl = val ? 1 : 0;
595 if (sk->sk_type != SOCK_RAW) {
599 inet->nodefrag = val ? 1 : 0;
601 case IP_MTU_DISCOVER:
602 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
604 inet->pmtudisc = val;
607 inet->recverr = !!val;
609 skb_queue_purge(&sk->sk_error_queue);
611 case IP_MULTICAST_TTL:
612 if (sk->sk_type == SOCK_STREAM)
618 if (val < 0 || val > 255)
622 case IP_MULTICAST_LOOP:
625 inet->mc_loop = !!val;
629 struct net_device *dev = NULL;
632 if (optlen != sizeof(int))
635 ifindex = (__force int)ntohl((__force __be32)val);
642 dev = dev_get_by_index(sock_net(sk), ifindex);
643 err = -EADDRNOTAVAIL;
649 if (sk->sk_bound_dev_if)
652 inet->uc_index = ifindex;
656 case IP_MULTICAST_IF:
658 struct ip_mreqn mreq;
659 struct net_device *dev = NULL;
661 if (sk->sk_type == SOCK_STREAM)
664 * Check the arguments are allowable
667 if (optlen < sizeof(struct in_addr))
671 if (optlen >= sizeof(struct ip_mreqn)) {
672 if (copy_from_user(&mreq, optval, sizeof(mreq)))
675 memset(&mreq, 0, sizeof(mreq));
676 if (optlen >= sizeof(struct in_addr) &&
677 copy_from_user(&mreq.imr_address, optval,
678 sizeof(struct in_addr)))
682 if (!mreq.imr_ifindex) {
683 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
689 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
691 mreq.imr_ifindex = dev->ifindex;
693 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
696 err = -EADDRNOTAVAIL;
702 if (sk->sk_bound_dev_if &&
703 mreq.imr_ifindex != sk->sk_bound_dev_if)
706 inet->mc_index = mreq.imr_ifindex;
707 inet->mc_addr = mreq.imr_address.s_addr;
712 case IP_ADD_MEMBERSHIP:
713 case IP_DROP_MEMBERSHIP:
715 struct ip_mreqn mreq;
718 if (inet_sk(sk)->is_icsk)
721 if (optlen < sizeof(struct ip_mreq))
724 if (optlen >= sizeof(struct ip_mreqn)) {
725 if (copy_from_user(&mreq, optval, sizeof(mreq)))
728 memset(&mreq, 0, sizeof(mreq));
729 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
733 if (optname == IP_ADD_MEMBERSHIP)
734 err = ip_mc_join_group(sk, &mreq);
736 err = ip_mc_leave_group(sk, &mreq);
741 struct ip_msfilter *msf;
743 if (optlen < IP_MSFILTER_SIZE(0))
745 if (optlen > sysctl_optmem_max) {
749 msf = kmalloc(optlen, GFP_KERNEL);
755 if (copy_from_user(msf, optval, optlen)) {
759 /* numsrc >= (1G-4) overflow in 32 bits */
760 if (msf->imsf_numsrc >= 0x3ffffffcU ||
761 msf->imsf_numsrc > sysctl_igmp_max_msf) {
766 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
771 err = ip_mc_msfilter(sk, msf, 0);
775 case IP_BLOCK_SOURCE:
776 case IP_UNBLOCK_SOURCE:
777 case IP_ADD_SOURCE_MEMBERSHIP:
778 case IP_DROP_SOURCE_MEMBERSHIP:
780 struct ip_mreq_source mreqs;
783 if (optlen != sizeof(struct ip_mreq_source))
785 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
789 if (optname == IP_BLOCK_SOURCE) {
790 omode = MCAST_EXCLUDE;
792 } else if (optname == IP_UNBLOCK_SOURCE) {
793 omode = MCAST_EXCLUDE;
795 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
796 struct ip_mreqn mreq;
798 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
799 mreq.imr_address.s_addr = mreqs.imr_interface;
800 mreq.imr_ifindex = 0;
801 err = ip_mc_join_group(sk, &mreq);
802 if (err && err != -EADDRINUSE)
804 omode = MCAST_INCLUDE;
806 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
807 omode = MCAST_INCLUDE;
810 err = ip_mc_source(add, omode, sk, &mreqs, 0);
813 case MCAST_JOIN_GROUP:
814 case MCAST_LEAVE_GROUP:
816 struct group_req greq;
817 struct sockaddr_in *psin;
818 struct ip_mreqn mreq;
820 if (optlen < sizeof(struct group_req))
823 if (copy_from_user(&greq, optval, sizeof(greq)))
825 psin = (struct sockaddr_in *)&greq.gr_group;
826 if (psin->sin_family != AF_INET)
828 memset(&mreq, 0, sizeof(mreq));
829 mreq.imr_multiaddr = psin->sin_addr;
830 mreq.imr_ifindex = greq.gr_interface;
832 if (optname == MCAST_JOIN_GROUP)
833 err = ip_mc_join_group(sk, &mreq);
835 err = ip_mc_leave_group(sk, &mreq);
838 case MCAST_JOIN_SOURCE_GROUP:
839 case MCAST_LEAVE_SOURCE_GROUP:
840 case MCAST_BLOCK_SOURCE:
841 case MCAST_UNBLOCK_SOURCE:
843 struct group_source_req greqs;
844 struct ip_mreq_source mreqs;
845 struct sockaddr_in *psin;
848 if (optlen != sizeof(struct group_source_req))
850 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
854 if (greqs.gsr_group.ss_family != AF_INET ||
855 greqs.gsr_source.ss_family != AF_INET) {
856 err = -EADDRNOTAVAIL;
859 psin = (struct sockaddr_in *)&greqs.gsr_group;
860 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
861 psin = (struct sockaddr_in *)&greqs.gsr_source;
862 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
863 mreqs.imr_interface = 0; /* use index for mc_source */
865 if (optname == MCAST_BLOCK_SOURCE) {
866 omode = MCAST_EXCLUDE;
868 } else if (optname == MCAST_UNBLOCK_SOURCE) {
869 omode = MCAST_EXCLUDE;
871 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
872 struct ip_mreqn mreq;
874 psin = (struct sockaddr_in *)&greqs.gsr_group;
875 mreq.imr_multiaddr = psin->sin_addr;
876 mreq.imr_address.s_addr = 0;
877 mreq.imr_ifindex = greqs.gsr_interface;
878 err = ip_mc_join_group(sk, &mreq);
879 if (err && err != -EADDRINUSE)
881 greqs.gsr_interface = mreq.imr_ifindex;
882 omode = MCAST_INCLUDE;
884 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
885 omode = MCAST_INCLUDE;
888 err = ip_mc_source(add, omode, sk, &mreqs,
889 greqs.gsr_interface);
894 struct sockaddr_in *psin;
895 struct ip_msfilter *msf = NULL;
896 struct group_filter *gsf = NULL;
897 int msize, i, ifindex;
899 if (optlen < GROUP_FILTER_SIZE(0))
901 if (optlen > sysctl_optmem_max) {
905 gsf = kmalloc(optlen, GFP_KERNEL);
911 if (copy_from_user(gsf, optval, optlen))
914 /* numsrc >= (4G-140)/128 overflow in 32 bits */
915 if (gsf->gf_numsrc >= 0x1ffffff ||
916 gsf->gf_numsrc > sysctl_igmp_max_msf) {
920 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
924 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
925 msf = kmalloc(msize, GFP_KERNEL);
930 ifindex = gsf->gf_interface;
931 psin = (struct sockaddr_in *)&gsf->gf_group;
932 if (psin->sin_family != AF_INET) {
933 err = -EADDRNOTAVAIL;
936 msf->imsf_multiaddr = psin->sin_addr.s_addr;
937 msf->imsf_interface = 0;
938 msf->imsf_fmode = gsf->gf_fmode;
939 msf->imsf_numsrc = gsf->gf_numsrc;
940 err = -EADDRNOTAVAIL;
941 for (i = 0; i < gsf->gf_numsrc; ++i) {
942 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
944 if (psin->sin_family != AF_INET)
946 msf->imsf_slist[i] = psin->sin_addr.s_addr;
951 err = ip_mc_msfilter(sk, msf, ifindex);
957 case IP_MULTICAST_ALL:
960 if (val != 0 && val != 1)
964 case IP_ROUTER_ALERT:
965 err = ip_ra_control(sk, val ? 1 : 0, NULL);
971 inet->freebind = !!val;
974 case IP_IPSEC_POLICY:
977 if (!capable(CAP_NET_ADMIN))
979 err = xfrm_user_policy(sk, optname, optval, optlen);
983 if (!!val && !capable(CAP_NET_RAW) && !capable(CAP_NET_ADMIN)) {
989 inet->transparent = !!val;
995 if (val < 0 || val > 255)
1013 * ipv4_pktinfo_prepare - transfert some info from rtable to skb
1017 * To support IP_CMSG_PKTINFO option, we store rt_iif and rt_spec_dst
1018 * in skb->cb[] before dst drop.
1019 * This way, receiver doesnt make cache line misses to read rtable.
1021 void ipv4_pktinfo_prepare(struct sk_buff *skb)
1023 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1024 const struct rtable *rt = skb_rtable(skb);
1027 pktinfo->ipi_ifindex = rt->rt_iif;
1028 pktinfo->ipi_spec_dst.s_addr = rt->rt_spec_dst;
1030 pktinfo->ipi_ifindex = 0;
1031 pktinfo->ipi_spec_dst.s_addr = 0;
1036 int ip_setsockopt(struct sock *sk, int level,
1037 int optname, char __user *optval, unsigned int optlen)
1041 if (level != SOL_IP)
1042 return -ENOPROTOOPT;
1044 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1045 #ifdef CONFIG_NETFILTER
1046 /* we need to exclude all possible ENOPROTOOPTs except default case */
1047 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1048 optname != IP_IPSEC_POLICY &&
1049 optname != IP_XFRM_POLICY &&
1050 !ip_mroute_opt(optname)) {
1052 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1058 EXPORT_SYMBOL(ip_setsockopt);
1060 #ifdef CONFIG_COMPAT
1061 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1062 char __user *optval, unsigned int optlen)
1066 if (level != SOL_IP)
1067 return -ENOPROTOOPT;
1069 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1070 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1073 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1074 #ifdef CONFIG_NETFILTER
1075 /* we need to exclude all possible ENOPROTOOPTs except default case */
1076 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1077 optname != IP_IPSEC_POLICY &&
1078 optname != IP_XFRM_POLICY &&
1079 !ip_mroute_opt(optname)) {
1081 err = compat_nf_setsockopt(sk, PF_INET, optname,
1088 EXPORT_SYMBOL(compat_ip_setsockopt);
1092 * Get the options. Note for future reference. The GET of IP options gets
1093 * the _received_ ones. The set sets the _sent_ ones.
1096 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1097 char __user *optval, int __user *optlen, unsigned flags)
1099 struct inet_sock *inet = inet_sk(sk);
1103 if (level != SOL_IP)
1106 if (ip_mroute_opt(optname))
1107 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1109 if (get_user(len, optlen))
1119 unsigned char optbuf[sizeof(struct ip_options)+40];
1120 struct ip_options *opt = (struct ip_options *)optbuf;
1121 struct ip_options_rcu *inet_opt;
1123 inet_opt = rcu_dereference_protected(inet->inet_opt,
1124 sock_owned_by_user(sk));
1127 memcpy(optbuf, &inet_opt->opt,
1128 sizeof(struct ip_options) +
1129 inet_opt->opt.optlen);
1132 if (opt->optlen == 0)
1133 return put_user(0, optlen);
1135 ip_options_undo(opt);
1137 len = min_t(unsigned int, len, opt->optlen);
1138 if (put_user(len, optlen))
1140 if (copy_to_user(optval, opt->__data, len))
1145 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1148 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1151 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1154 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1157 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1160 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1162 case IP_RECVORIGDSTADDR:
1163 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1169 val = (inet->uc_ttl == -1 ?
1170 sysctl_ip_default_ttl :
1174 val = inet->hdrincl;
1177 val = inet->nodefrag;
1179 case IP_MTU_DISCOVER:
1180 val = inet->pmtudisc;
1184 struct dst_entry *dst;
1186 dst = sk_dst_get(sk);
1198 val = inet->recverr;
1200 case IP_MULTICAST_TTL:
1203 case IP_MULTICAST_LOOP:
1204 val = inet->mc_loop;
1207 val = (__force int)htonl((__u32) inet->uc_index);
1209 case IP_MULTICAST_IF:
1211 struct in_addr addr;
1212 len = min_t(unsigned int, len, sizeof(struct in_addr));
1213 addr.s_addr = inet->mc_addr;
1216 if (put_user(len, optlen))
1218 if (copy_to_user(optval, &addr, len))
1224 struct ip_msfilter msf;
1227 if (len < IP_MSFILTER_SIZE(0)) {
1231 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1235 err = ip_mc_msfget(sk, &msf,
1236 (struct ip_msfilter __user *)optval, optlen);
1240 case MCAST_MSFILTER:
1242 struct group_filter gsf;
1245 if (len < GROUP_FILTER_SIZE(0)) {
1249 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1253 err = ip_mc_gsfget(sk, &gsf,
1254 (struct group_filter __user *)optval,
1259 case IP_MULTICAST_ALL:
1268 if (sk->sk_type != SOCK_STREAM)
1269 return -ENOPROTOOPT;
1271 msg.msg_control = optval;
1272 msg.msg_controllen = len;
1273 msg.msg_flags = flags;
1275 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1276 struct in_pktinfo info;
1278 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1279 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1280 info.ipi_ifindex = inet->mc_index;
1281 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1283 if (inet->cmsg_flags & IP_CMSG_TTL) {
1284 int hlim = inet->mc_ttl;
1285 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1287 if (inet->cmsg_flags & IP_CMSG_TOS) {
1288 int tos = inet->rcv_tos;
1289 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1291 len -= msg.msg_controllen;
1292 return put_user(len, optlen);
1295 val = inet->freebind;
1297 case IP_TRANSPARENT:
1298 val = inet->transparent;
1301 val = inet->min_ttl;
1305 return -ENOPROTOOPT;
1309 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1310 unsigned char ucval = (unsigned char)val;
1312 if (put_user(len, optlen))
1314 if (copy_to_user(optval, &ucval, 1))
1317 len = min_t(unsigned int, sizeof(int), len);
1318 if (put_user(len, optlen))
1320 if (copy_to_user(optval, &val, len))
1326 int ip_getsockopt(struct sock *sk, int level,
1327 int optname, char __user *optval, int __user *optlen)
1331 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1332 #ifdef CONFIG_NETFILTER
1333 /* we need to exclude all possible ENOPROTOOPTs except default case */
1334 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1335 !ip_mroute_opt(optname)) {
1338 if (get_user(len, optlen))
1342 err = nf_getsockopt(sk, PF_INET, optname, optval,
1346 err = put_user(len, optlen);
1352 EXPORT_SYMBOL(ip_getsockopt);
1354 #ifdef CONFIG_COMPAT
1355 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1356 char __user *optval, int __user *optlen)
1360 if (optname == MCAST_MSFILTER)
1361 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1364 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1367 #ifdef CONFIG_NETFILTER
1368 /* we need to exclude all possible ENOPROTOOPTs except default case */
1369 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1370 !ip_mroute_opt(optname)) {
1373 if (get_user(len, optlen))
1377 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1380 err = put_user(len, optlen);
1386 EXPORT_SYMBOL(compat_ip_getsockopt);