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/route.h>
38 #include <net/compat.h>
39 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
40 #include <net/transp_v6.h>
43 #include <linux/errqueue.h>
44 #include <asm/uaccess.h>
46 #define IP_CMSG_PKTINFO 1
49 #define IP_CMSG_RECVOPTS 8
50 #define IP_CMSG_RETOPTS 16
51 #define IP_CMSG_PASSSEC 32
52 #define IP_CMSG_ORIGDSTADDR 64
55 * SOL_IP control messages.
58 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
60 struct in_pktinfo info;
61 struct rtable *rt = skb_rtable(skb);
63 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
65 info.ipi_ifindex = rt->rt_iif;
66 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
69 info.ipi_spec_dst.s_addr = 0;
72 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
75 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
77 int ttl = ip_hdr(skb)->ttl;
78 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
81 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
83 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
86 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
88 if (IPCB(skb)->opt.optlen == 0)
91 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
96 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
98 unsigned char optbuf[sizeof(struct ip_options) + 40];
99 struct ip_options * opt = (struct ip_options *)optbuf;
101 if (IPCB(skb)->opt.optlen == 0)
104 if (ip_options_echo(opt, skb)) {
105 msg->msg_flags |= MSG_CTRUNC;
108 ip_options_undo(opt);
110 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
113 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
119 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
123 err = security_secid_to_secctx(secid, &secdata, &seclen);
127 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
128 security_release_secctx(secdata, seclen);
131 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
133 struct sockaddr_in sin;
134 struct iphdr *iph = ip_hdr(skb);
135 __be16 *ports = (__be16 *)skb_transport_header(skb);
137 if (skb_transport_offset(skb) + 4 > skb->len)
140 /* All current transport protocols have the port numbers in the
141 * first four bytes of the transport header and this function is
142 * written with this assumption in mind.
145 sin.sin_family = AF_INET;
146 sin.sin_addr.s_addr = iph->daddr;
147 sin.sin_port = ports[1];
148 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
150 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
153 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
155 struct inet_sock *inet = inet_sk(skb->sk);
156 unsigned flags = inet->cmsg_flags;
158 /* Ordered by supposed usage frequency */
160 ip_cmsg_recv_pktinfo(msg, skb);
161 if ((flags >>= 1) == 0)
165 ip_cmsg_recv_ttl(msg, skb);
166 if ((flags >>= 1) == 0)
170 ip_cmsg_recv_tos(msg, skb);
171 if ((flags >>= 1) == 0)
175 ip_cmsg_recv_opts(msg, skb);
176 if ((flags >>= 1) == 0)
180 ip_cmsg_recv_retopts(msg, skb);
181 if ((flags >>= 1) == 0)
185 ip_cmsg_recv_security(msg, skb);
187 if ((flags >>= 1) == 0)
190 ip_cmsg_recv_dstaddr(msg, skb);
193 EXPORT_SYMBOL(ip_cmsg_recv);
195 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
198 struct cmsghdr *cmsg;
200 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
201 if (!CMSG_OK(msg, cmsg))
203 if (cmsg->cmsg_level != SOL_IP)
205 switch (cmsg->cmsg_type) {
207 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
208 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
209 err < 40 ? err : 40);
215 struct in_pktinfo *info;
216 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
218 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
219 ipc->oif = info->ipi_ifindex;
220 ipc->addr = info->ipi_spec_dst.s_addr;
231 /* Special input handler for packets caught by router alert option.
232 They are selected only by protocol field, and then processed likely
233 local ones; but only if someone wants them! Otherwise, router
234 not running rsvpd will kill RSVP.
236 It is user level problem, what it will make with them.
237 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
238 but receiver should be enough clever f.e. to forward mtrace requests,
239 sent to multicast group to reach destination designated router.
241 struct ip_ra_chain __rcu *ip_ra_chain;
242 static DEFINE_SPINLOCK(ip_ra_lock);
245 static void ip_ra_destroy_rcu(struct rcu_head *head)
247 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
249 sock_put(ra->saved_sk);
253 int ip_ra_control(struct sock *sk, unsigned char on,
254 void (*destructor)(struct sock *))
256 struct ip_ra_chain *ra, *new_ra;
257 struct ip_ra_chain __rcu **rap;
259 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
262 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
264 spin_lock_bh(&ip_ra_lock);
265 for (rap = &ip_ra_chain;
266 (ra = rcu_dereference_protected(*rap,
267 lockdep_is_held(&ip_ra_lock))) != NULL;
271 spin_unlock_bh(&ip_ra_lock);
275 /* dont let ip_call_ra_chain() use sk again */
277 rcu_assign_pointer(*rap, ra->next);
278 spin_unlock_bh(&ip_ra_lock);
283 * Delay sock_put(sk) and kfree(ra) after one rcu grace
284 * period. This guarantee ip_call_ra_chain() dont need
285 * to mess with socket refcounts.
288 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
292 if (new_ra == NULL) {
293 spin_unlock_bh(&ip_ra_lock);
297 new_ra->destructor = destructor;
300 rcu_assign_pointer(*rap, new_ra);
302 spin_unlock_bh(&ip_ra_lock);
307 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
308 __be16 port, u32 info, u8 *payload)
310 struct sock_exterr_skb *serr;
312 skb = skb_clone(skb, GFP_ATOMIC);
316 serr = SKB_EXT_ERR(skb);
317 serr->ee.ee_errno = err;
318 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
319 serr->ee.ee_type = icmp_hdr(skb)->type;
320 serr->ee.ee_code = icmp_hdr(skb)->code;
322 serr->ee.ee_info = info;
323 serr->ee.ee_data = 0;
324 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
325 skb_network_header(skb);
328 if (skb_pull(skb, payload - skb->data) != NULL) {
329 skb_reset_transport_header(skb);
330 if (sock_queue_err_skb(sk, skb) == 0)
336 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
338 struct inet_sock *inet = inet_sk(sk);
339 struct sock_exterr_skb *serr;
346 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
350 skb_put(skb, sizeof(struct iphdr));
351 skb_reset_network_header(skb);
355 serr = SKB_EXT_ERR(skb);
356 serr->ee.ee_errno = err;
357 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
358 serr->ee.ee_type = 0;
359 serr->ee.ee_code = 0;
361 serr->ee.ee_info = info;
362 serr->ee.ee_data = 0;
363 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
366 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
367 skb_reset_transport_header(skb);
369 if (sock_queue_err_skb(sk, skb))
374 * Handle MSG_ERRQUEUE
376 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
378 struct sock_exterr_skb *serr;
379 struct sk_buff *skb, *skb2;
380 struct sockaddr_in *sin;
382 struct sock_extended_err ee;
383 struct sockaddr_in offender;
389 skb = skb_dequeue(&sk->sk_error_queue);
395 msg->msg_flags |= MSG_TRUNC;
398 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
402 sock_recv_timestamp(msg, sk, skb);
404 serr = SKB_EXT_ERR(skb);
406 sin = (struct sockaddr_in *)msg->msg_name;
408 sin->sin_family = AF_INET;
409 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
411 sin->sin_port = serr->port;
412 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
415 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
416 sin = &errhdr.offender;
417 sin->sin_family = AF_UNSPEC;
418 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
419 struct inet_sock *inet = inet_sk(sk);
421 sin->sin_family = AF_INET;
422 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
424 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
425 if (inet->cmsg_flags)
426 ip_cmsg_recv(msg, skb);
429 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
431 /* Now we could try to dump offended packet options */
433 msg->msg_flags |= MSG_ERRQUEUE;
436 /* Reset and regenerate socket error */
437 spin_lock_bh(&sk->sk_error_queue.lock);
439 skb2 = skb_peek(&sk->sk_error_queue);
441 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
442 spin_unlock_bh(&sk->sk_error_queue.lock);
443 sk->sk_error_report(sk);
445 spin_unlock_bh(&sk->sk_error_queue.lock);
455 * Socket option code for IP. This is the end of the line after any
456 * TCP,UDP etc options on an IP socket.
459 static int do_ip_setsockopt(struct sock *sk, int level,
460 int optname, char __user *optval, unsigned int optlen)
462 struct inet_sock *inet = inet_sk(sk);
465 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
466 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
467 (1<<IP_RETOPTS) | (1<<IP_TOS) |
468 (1<<IP_TTL) | (1<<IP_HDRINCL) |
469 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
470 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
471 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) |
472 (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) ||
473 optname == IP_MULTICAST_TTL ||
474 optname == IP_MULTICAST_ALL ||
475 optname == IP_MULTICAST_LOOP ||
476 optname == IP_RECVORIGDSTADDR) {
477 if (optlen >= sizeof(int)) {
478 if (get_user(val, (int __user *) optval))
480 } else if (optlen >= sizeof(char)) {
483 if (get_user(ucval, (unsigned char __user *) optval))
489 /* If optlen==0, it is equivalent to val == 0 */
491 if (ip_mroute_opt(optname))
492 return ip_mroute_setsockopt(sk, optname, optval, optlen);
500 struct ip_options *opt = NULL;
503 err = ip_options_get_from_user(sock_net(sk), &opt,
508 struct inet_connection_sock *icsk = inet_csk(sk);
509 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
510 if (sk->sk_family == PF_INET ||
511 (!((1 << sk->sk_state) &
512 (TCPF_LISTEN | TCPF_CLOSE)) &&
513 inet->inet_daddr != LOOPBACK4_IPV6)) {
516 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
518 icsk->icsk_ext_hdr_len += opt->optlen;
519 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
520 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
524 opt = xchg(&inet->opt, opt);
530 inet->cmsg_flags |= IP_CMSG_PKTINFO;
532 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
536 inet->cmsg_flags |= IP_CMSG_TTL;
538 inet->cmsg_flags &= ~IP_CMSG_TTL;
542 inet->cmsg_flags |= IP_CMSG_TOS;
544 inet->cmsg_flags &= ~IP_CMSG_TOS;
548 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
550 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
554 inet->cmsg_flags |= IP_CMSG_RETOPTS;
556 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
560 inet->cmsg_flags |= IP_CMSG_PASSSEC;
562 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
564 case IP_RECVORIGDSTADDR:
566 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
568 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
570 case IP_TOS: /* This sets both TOS and Precedence */
571 if (sk->sk_type == SOCK_STREAM) {
573 val |= inet->tos & 3;
575 if (inet->tos != val) {
577 sk->sk_priority = rt_tos2priority(val);
584 if (val != -1 && (val < 0 || val > 255))
589 if (sk->sk_type != SOCK_RAW) {
593 inet->hdrincl = val ? 1 : 0;
596 if (sk->sk_type != SOCK_RAW) {
600 inet->nodefrag = val ? 1 : 0;
602 case IP_MTU_DISCOVER:
603 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
605 inet->pmtudisc = val;
608 inet->recverr = !!val;
610 skb_queue_purge(&sk->sk_error_queue);
612 case IP_MULTICAST_TTL:
613 if (sk->sk_type == SOCK_STREAM)
619 if (val < 0 || val > 255)
623 case IP_MULTICAST_LOOP:
626 inet->mc_loop = !!val;
628 case IP_MULTICAST_IF:
630 struct ip_mreqn mreq;
631 struct net_device *dev = NULL;
633 if (sk->sk_type == SOCK_STREAM)
636 * Check the arguments are allowable
639 if (optlen < sizeof(struct in_addr))
643 if (optlen >= sizeof(struct ip_mreqn)) {
644 if (copy_from_user(&mreq, optval, sizeof(mreq)))
647 memset(&mreq, 0, sizeof(mreq));
648 if (optlen >= sizeof(struct in_addr) &&
649 copy_from_user(&mreq.imr_address, optval,
650 sizeof(struct in_addr)))
654 if (!mreq.imr_ifindex) {
655 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
661 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
663 mreq.imr_ifindex = dev->ifindex;
665 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
668 err = -EADDRNOTAVAIL;
674 if (sk->sk_bound_dev_if &&
675 mreq.imr_ifindex != sk->sk_bound_dev_if)
678 inet->mc_index = mreq.imr_ifindex;
679 inet->mc_addr = mreq.imr_address.s_addr;
684 case IP_ADD_MEMBERSHIP:
685 case IP_DROP_MEMBERSHIP:
687 struct ip_mreqn mreq;
690 if (inet_sk(sk)->is_icsk)
693 if (optlen < sizeof(struct ip_mreq))
696 if (optlen >= sizeof(struct ip_mreqn)) {
697 if (copy_from_user(&mreq, optval, sizeof(mreq)))
700 memset(&mreq, 0, sizeof(mreq));
701 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
705 if (optname == IP_ADD_MEMBERSHIP)
706 err = ip_mc_join_group(sk, &mreq);
708 err = ip_mc_leave_group(sk, &mreq);
713 struct ip_msfilter *msf;
715 if (optlen < IP_MSFILTER_SIZE(0))
717 if (optlen > sysctl_optmem_max) {
721 msf = kmalloc(optlen, GFP_KERNEL);
727 if (copy_from_user(msf, optval, optlen)) {
731 /* numsrc >= (1G-4) overflow in 32 bits */
732 if (msf->imsf_numsrc >= 0x3ffffffcU ||
733 msf->imsf_numsrc > sysctl_igmp_max_msf) {
738 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
743 err = ip_mc_msfilter(sk, msf, 0);
747 case IP_BLOCK_SOURCE:
748 case IP_UNBLOCK_SOURCE:
749 case IP_ADD_SOURCE_MEMBERSHIP:
750 case IP_DROP_SOURCE_MEMBERSHIP:
752 struct ip_mreq_source mreqs;
755 if (optlen != sizeof(struct ip_mreq_source))
757 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
761 if (optname == IP_BLOCK_SOURCE) {
762 omode = MCAST_EXCLUDE;
764 } else if (optname == IP_UNBLOCK_SOURCE) {
765 omode = MCAST_EXCLUDE;
767 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
768 struct ip_mreqn mreq;
770 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
771 mreq.imr_address.s_addr = mreqs.imr_interface;
772 mreq.imr_ifindex = 0;
773 err = ip_mc_join_group(sk, &mreq);
774 if (err && err != -EADDRINUSE)
776 omode = MCAST_INCLUDE;
778 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
779 omode = MCAST_INCLUDE;
782 err = ip_mc_source(add, omode, sk, &mreqs, 0);
785 case MCAST_JOIN_GROUP:
786 case MCAST_LEAVE_GROUP:
788 struct group_req greq;
789 struct sockaddr_in *psin;
790 struct ip_mreqn mreq;
792 if (optlen < sizeof(struct group_req))
795 if (copy_from_user(&greq, optval, sizeof(greq)))
797 psin = (struct sockaddr_in *)&greq.gr_group;
798 if (psin->sin_family != AF_INET)
800 memset(&mreq, 0, sizeof(mreq));
801 mreq.imr_multiaddr = psin->sin_addr;
802 mreq.imr_ifindex = greq.gr_interface;
804 if (optname == MCAST_JOIN_GROUP)
805 err = ip_mc_join_group(sk, &mreq);
807 err = ip_mc_leave_group(sk, &mreq);
810 case MCAST_JOIN_SOURCE_GROUP:
811 case MCAST_LEAVE_SOURCE_GROUP:
812 case MCAST_BLOCK_SOURCE:
813 case MCAST_UNBLOCK_SOURCE:
815 struct group_source_req greqs;
816 struct ip_mreq_source mreqs;
817 struct sockaddr_in *psin;
820 if (optlen != sizeof(struct group_source_req))
822 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
826 if (greqs.gsr_group.ss_family != AF_INET ||
827 greqs.gsr_source.ss_family != AF_INET) {
828 err = -EADDRNOTAVAIL;
831 psin = (struct sockaddr_in *)&greqs.gsr_group;
832 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
833 psin = (struct sockaddr_in *)&greqs.gsr_source;
834 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
835 mreqs.imr_interface = 0; /* use index for mc_source */
837 if (optname == MCAST_BLOCK_SOURCE) {
838 omode = MCAST_EXCLUDE;
840 } else if (optname == MCAST_UNBLOCK_SOURCE) {
841 omode = MCAST_EXCLUDE;
843 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
844 struct ip_mreqn mreq;
846 psin = (struct sockaddr_in *)&greqs.gsr_group;
847 mreq.imr_multiaddr = psin->sin_addr;
848 mreq.imr_address.s_addr = 0;
849 mreq.imr_ifindex = greqs.gsr_interface;
850 err = ip_mc_join_group(sk, &mreq);
851 if (err && err != -EADDRINUSE)
853 greqs.gsr_interface = mreq.imr_ifindex;
854 omode = MCAST_INCLUDE;
856 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
857 omode = MCAST_INCLUDE;
860 err = ip_mc_source(add, omode, sk, &mreqs,
861 greqs.gsr_interface);
866 struct sockaddr_in *psin;
867 struct ip_msfilter *msf = NULL;
868 struct group_filter *gsf = NULL;
869 int msize, i, ifindex;
871 if (optlen < GROUP_FILTER_SIZE(0))
873 if (optlen > sysctl_optmem_max) {
877 gsf = kmalloc(optlen, GFP_KERNEL);
883 if (copy_from_user(gsf, optval, optlen))
886 /* numsrc >= (4G-140)/128 overflow in 32 bits */
887 if (gsf->gf_numsrc >= 0x1ffffff ||
888 gsf->gf_numsrc > sysctl_igmp_max_msf) {
892 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
896 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
897 msf = kmalloc(msize, GFP_KERNEL);
902 ifindex = gsf->gf_interface;
903 psin = (struct sockaddr_in *)&gsf->gf_group;
904 if (psin->sin_family != AF_INET) {
905 err = -EADDRNOTAVAIL;
908 msf->imsf_multiaddr = psin->sin_addr.s_addr;
909 msf->imsf_interface = 0;
910 msf->imsf_fmode = gsf->gf_fmode;
911 msf->imsf_numsrc = gsf->gf_numsrc;
912 err = -EADDRNOTAVAIL;
913 for (i = 0; i < gsf->gf_numsrc; ++i) {
914 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
916 if (psin->sin_family != AF_INET)
918 msf->imsf_slist[i] = psin->sin_addr.s_addr;
923 err = ip_mc_msfilter(sk, msf, ifindex);
929 case IP_MULTICAST_ALL:
932 if (val != 0 && val != 1)
936 case IP_ROUTER_ALERT:
937 err = ip_ra_control(sk, val ? 1 : 0, NULL);
943 inet->freebind = !!val;
946 case IP_IPSEC_POLICY:
949 if (!capable(CAP_NET_ADMIN))
951 err = xfrm_user_policy(sk, optname, optval, optlen);
955 if (!capable(CAP_NET_ADMIN)) {
961 inet->transparent = !!val;
967 if (val < 0 || val > 255)
985 * ip_queue_rcv_skb - Queue an skb into sock receive queue
989 * Queues an skb into socket receive queue. If IP_CMSG_PKTINFO option
990 * is not set, we drop skb dst entry now, while dst cache line is hot.
992 int ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
994 if (!(inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO))
996 return sock_queue_rcv_skb(sk, skb);
998 EXPORT_SYMBOL(ip_queue_rcv_skb);
1000 int ip_setsockopt(struct sock *sk, int level,
1001 int optname, char __user *optval, unsigned int optlen)
1005 if (level != SOL_IP)
1006 return -ENOPROTOOPT;
1008 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1009 #ifdef CONFIG_NETFILTER
1010 /* we need to exclude all possible ENOPROTOOPTs except default case */
1011 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1012 optname != IP_IPSEC_POLICY &&
1013 optname != IP_XFRM_POLICY &&
1014 !ip_mroute_opt(optname)) {
1016 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1022 EXPORT_SYMBOL(ip_setsockopt);
1024 #ifdef CONFIG_COMPAT
1025 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1026 char __user *optval, unsigned int optlen)
1030 if (level != SOL_IP)
1031 return -ENOPROTOOPT;
1033 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1034 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1037 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1038 #ifdef CONFIG_NETFILTER
1039 /* we need to exclude all possible ENOPROTOOPTs except default case */
1040 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1041 optname != IP_IPSEC_POLICY &&
1042 optname != IP_XFRM_POLICY &&
1043 !ip_mroute_opt(optname)) {
1045 err = compat_nf_setsockopt(sk, PF_INET, optname,
1052 EXPORT_SYMBOL(compat_ip_setsockopt);
1056 * Get the options. Note for future reference. The GET of IP options gets
1057 * the _received_ ones. The set sets the _sent_ ones.
1060 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1061 char __user *optval, int __user *optlen)
1063 struct inet_sock *inet = inet_sk(sk);
1067 if (level != SOL_IP)
1070 if (ip_mroute_opt(optname))
1071 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1073 if (get_user(len, optlen))
1083 unsigned char optbuf[sizeof(struct ip_options)+40];
1084 struct ip_options * opt = (struct ip_options *)optbuf;
1087 memcpy(optbuf, inet->opt,
1088 sizeof(struct ip_options)+
1092 if (opt->optlen == 0)
1093 return put_user(0, optlen);
1095 ip_options_undo(opt);
1097 len = min_t(unsigned int, len, opt->optlen);
1098 if (put_user(len, optlen))
1100 if (copy_to_user(optval, opt->__data, len))
1105 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1108 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1111 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1114 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1117 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1120 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1122 case IP_RECVORIGDSTADDR:
1123 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1129 val = (inet->uc_ttl == -1 ?
1130 sysctl_ip_default_ttl :
1134 val = inet->hdrincl;
1137 val = inet->nodefrag;
1139 case IP_MTU_DISCOVER:
1140 val = inet->pmtudisc;
1144 struct dst_entry *dst;
1146 dst = sk_dst_get(sk);
1158 val = inet->recverr;
1160 case IP_MULTICAST_TTL:
1163 case IP_MULTICAST_LOOP:
1164 val = inet->mc_loop;
1166 case IP_MULTICAST_IF:
1168 struct in_addr addr;
1169 len = min_t(unsigned int, len, sizeof(struct in_addr));
1170 addr.s_addr = inet->mc_addr;
1173 if (put_user(len, optlen))
1175 if (copy_to_user(optval, &addr, len))
1181 struct ip_msfilter msf;
1184 if (len < IP_MSFILTER_SIZE(0)) {
1188 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1192 err = ip_mc_msfget(sk, &msf,
1193 (struct ip_msfilter __user *)optval, optlen);
1197 case MCAST_MSFILTER:
1199 struct group_filter gsf;
1202 if (len < GROUP_FILTER_SIZE(0)) {
1206 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1210 err = ip_mc_gsfget(sk, &gsf,
1211 (struct group_filter __user *)optval,
1216 case IP_MULTICAST_ALL:
1225 if (sk->sk_type != SOCK_STREAM)
1226 return -ENOPROTOOPT;
1228 msg.msg_control = optval;
1229 msg.msg_controllen = len;
1232 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1233 struct in_pktinfo info;
1235 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1236 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1237 info.ipi_ifindex = inet->mc_index;
1238 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1240 if (inet->cmsg_flags & IP_CMSG_TTL) {
1241 int hlim = inet->mc_ttl;
1242 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1244 len -= msg.msg_controllen;
1245 return put_user(len, optlen);
1248 val = inet->freebind;
1250 case IP_TRANSPARENT:
1251 val = inet->transparent;
1254 val = inet->min_ttl;
1258 return -ENOPROTOOPT;
1262 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1263 unsigned char ucval = (unsigned char)val;
1265 if (put_user(len, optlen))
1267 if (copy_to_user(optval, &ucval, 1))
1270 len = min_t(unsigned int, sizeof(int), len);
1271 if (put_user(len, optlen))
1273 if (copy_to_user(optval, &val, len))
1279 int ip_getsockopt(struct sock *sk, int level,
1280 int optname, char __user *optval, int __user *optlen)
1284 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1285 #ifdef CONFIG_NETFILTER
1286 /* we need to exclude all possible ENOPROTOOPTs except default case */
1287 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1288 !ip_mroute_opt(optname)) {
1291 if (get_user(len, optlen))
1295 err = nf_getsockopt(sk, PF_INET, optname, optval,
1299 err = put_user(len, optlen);
1305 EXPORT_SYMBOL(ip_getsockopt);
1307 #ifdef CONFIG_COMPAT
1308 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1309 char __user *optval, int __user *optlen)
1313 if (optname == MCAST_MSFILTER)
1314 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1317 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1319 #ifdef CONFIG_NETFILTER
1320 /* we need to exclude all possible ENOPROTOOPTs except default case */
1321 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1322 !ip_mroute_opt(optname)) {
1325 if (get_user(len, optlen))
1329 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1332 err = put_user(len, optlen);
1338 EXPORT_SYMBOL(compat_ip_getsockopt);