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 *ip_ra_chain;
242 DEFINE_RWLOCK(ip_ra_lock);
244 int ip_ra_control(struct sock *sk, unsigned char on,
245 void (*destructor)(struct sock *))
247 struct ip_ra_chain *ra, *new_ra, **rap;
249 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
252 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
254 write_lock_bh(&ip_ra_lock);
255 for (rap = &ip_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
258 write_unlock_bh(&ip_ra_lock);
263 write_unlock_bh(&ip_ra_lock);
272 if (new_ra == NULL) {
273 write_unlock_bh(&ip_ra_lock);
277 new_ra->destructor = destructor;
282 write_unlock_bh(&ip_ra_lock);
287 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
288 __be16 port, u32 info, u8 *payload)
290 struct inet_sock *inet = inet_sk(sk);
291 struct sock_exterr_skb *serr;
296 skb = skb_clone(skb, GFP_ATOMIC);
300 serr = SKB_EXT_ERR(skb);
301 serr->ee.ee_errno = err;
302 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
303 serr->ee.ee_type = icmp_hdr(skb)->type;
304 serr->ee.ee_code = icmp_hdr(skb)->code;
306 serr->ee.ee_info = info;
307 serr->ee.ee_data = 0;
308 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
309 skb_network_header(skb);
312 if (skb_pull(skb, payload - skb->data) != NULL) {
313 skb_reset_transport_header(skb);
314 if (sock_queue_err_skb(sk, skb) == 0)
320 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
322 struct inet_sock *inet = inet_sk(sk);
323 struct sock_exterr_skb *serr;
330 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
334 skb_put(skb, sizeof(struct iphdr));
335 skb_reset_network_header(skb);
339 serr = SKB_EXT_ERR(skb);
340 serr->ee.ee_errno = err;
341 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
342 serr->ee.ee_type = 0;
343 serr->ee.ee_code = 0;
345 serr->ee.ee_info = info;
346 serr->ee.ee_data = 0;
347 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
350 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
351 skb_reset_transport_header(skb);
353 if (sock_queue_err_skb(sk, skb))
358 * Handle MSG_ERRQUEUE
360 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
362 struct sock_exterr_skb *serr;
363 struct sk_buff *skb, *skb2;
364 struct sockaddr_in *sin;
366 struct sock_extended_err ee;
367 struct sockaddr_in offender;
373 skb = skb_dequeue(&sk->sk_error_queue);
379 msg->msg_flags |= MSG_TRUNC;
382 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
386 sock_recv_timestamp(msg, sk, skb);
388 serr = SKB_EXT_ERR(skb);
390 sin = (struct sockaddr_in *)msg->msg_name;
392 sin->sin_family = AF_INET;
393 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
395 sin->sin_port = serr->port;
396 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
399 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
400 sin = &errhdr.offender;
401 sin->sin_family = AF_UNSPEC;
402 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
403 struct inet_sock *inet = inet_sk(sk);
405 sin->sin_family = AF_INET;
406 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
408 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
409 if (inet->cmsg_flags)
410 ip_cmsg_recv(msg, skb);
413 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
415 /* Now we could try to dump offended packet options */
417 msg->msg_flags |= MSG_ERRQUEUE;
420 /* Reset and regenerate socket error */
421 spin_lock_bh(&sk->sk_error_queue.lock);
423 skb2 = skb_peek(&sk->sk_error_queue);
425 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
426 spin_unlock_bh(&sk->sk_error_queue.lock);
427 sk->sk_error_report(sk);
429 spin_unlock_bh(&sk->sk_error_queue.lock);
439 * Socket option code for IP. This is the end of the line after any
440 * TCP,UDP etc options on an IP socket.
443 static int do_ip_setsockopt(struct sock *sk, int level,
444 int optname, char __user *optval, unsigned int optlen)
446 struct inet_sock *inet = inet_sk(sk);
449 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
450 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
451 (1<<IP_RETOPTS) | (1<<IP_TOS) |
452 (1<<IP_TTL) | (1<<IP_HDRINCL) |
453 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
454 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
455 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) |
457 optname == IP_MULTICAST_TTL ||
458 optname == IP_MULTICAST_ALL ||
459 optname == IP_MULTICAST_LOOP ||
460 optname == IP_RECVORIGDSTADDR) {
461 if (optlen >= sizeof(int)) {
462 if (get_user(val, (int __user *) optval))
464 } else if (optlen >= sizeof(char)) {
467 if (get_user(ucval, (unsigned char __user *) optval))
473 /* If optlen==0, it is equivalent to val == 0 */
475 if (ip_mroute_opt(optname))
476 return ip_mroute_setsockopt(sk, optname, optval, optlen);
484 struct ip_options *opt = NULL;
487 err = ip_options_get_from_user(sock_net(sk), &opt,
492 struct inet_connection_sock *icsk = inet_csk(sk);
493 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
494 if (sk->sk_family == PF_INET ||
495 (!((1 << sk->sk_state) &
496 (TCPF_LISTEN | TCPF_CLOSE)) &&
497 inet->inet_daddr != LOOPBACK4_IPV6)) {
500 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
502 icsk->icsk_ext_hdr_len += opt->optlen;
503 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
504 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
508 opt = xchg(&inet->opt, opt);
514 inet->cmsg_flags |= IP_CMSG_PKTINFO;
516 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
520 inet->cmsg_flags |= IP_CMSG_TTL;
522 inet->cmsg_flags &= ~IP_CMSG_TTL;
526 inet->cmsg_flags |= IP_CMSG_TOS;
528 inet->cmsg_flags &= ~IP_CMSG_TOS;
532 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
534 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
538 inet->cmsg_flags |= IP_CMSG_RETOPTS;
540 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
544 inet->cmsg_flags |= IP_CMSG_PASSSEC;
546 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
548 case IP_RECVORIGDSTADDR:
550 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
552 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
554 case IP_TOS: /* This sets both TOS and Precedence */
555 if (sk->sk_type == SOCK_STREAM) {
557 val |= inet->tos & 3;
559 if (inet->tos != val) {
561 sk->sk_priority = rt_tos2priority(val);
568 if (val != -1 && (val < 0 || val > 255))
573 if (sk->sk_type != SOCK_RAW) {
577 inet->hdrincl = val ? 1 : 0;
579 case IP_MTU_DISCOVER:
580 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
582 inet->pmtudisc = val;
585 inet->recverr = !!val;
587 skb_queue_purge(&sk->sk_error_queue);
589 case IP_MULTICAST_TTL:
590 if (sk->sk_type == SOCK_STREAM)
596 if (val < 0 || val > 255)
600 case IP_MULTICAST_LOOP:
603 inet->mc_loop = !!val;
605 case IP_MULTICAST_IF:
607 struct ip_mreqn mreq;
608 struct net_device *dev = NULL;
610 if (sk->sk_type == SOCK_STREAM)
613 * Check the arguments are allowable
616 if (optlen < sizeof(struct in_addr))
620 if (optlen >= sizeof(struct ip_mreqn)) {
621 if (copy_from_user(&mreq, optval, sizeof(mreq)))
624 memset(&mreq, 0, sizeof(mreq));
625 if (optlen >= sizeof(struct in_addr) &&
626 copy_from_user(&mreq.imr_address, optval,
627 sizeof(struct in_addr)))
631 if (!mreq.imr_ifindex) {
632 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
638 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
640 mreq.imr_ifindex = dev->ifindex;
642 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
645 err = -EADDRNOTAVAIL;
651 if (sk->sk_bound_dev_if &&
652 mreq.imr_ifindex != sk->sk_bound_dev_if)
655 inet->mc_index = mreq.imr_ifindex;
656 inet->mc_addr = mreq.imr_address.s_addr;
661 case IP_ADD_MEMBERSHIP:
662 case IP_DROP_MEMBERSHIP:
664 struct ip_mreqn mreq;
667 if (inet_sk(sk)->is_icsk)
670 if (optlen < sizeof(struct ip_mreq))
673 if (optlen >= sizeof(struct ip_mreqn)) {
674 if (copy_from_user(&mreq, optval, sizeof(mreq)))
677 memset(&mreq, 0, sizeof(mreq));
678 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
682 if (optname == IP_ADD_MEMBERSHIP)
683 err = ip_mc_join_group(sk, &mreq);
685 err = ip_mc_leave_group(sk, &mreq);
690 struct ip_msfilter *msf;
692 if (optlen < IP_MSFILTER_SIZE(0))
694 if (optlen > sysctl_optmem_max) {
698 msf = kmalloc(optlen, GFP_KERNEL);
704 if (copy_from_user(msf, optval, optlen)) {
708 /* numsrc >= (1G-4) overflow in 32 bits */
709 if (msf->imsf_numsrc >= 0x3ffffffcU ||
710 msf->imsf_numsrc > sysctl_igmp_max_msf) {
715 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
720 err = ip_mc_msfilter(sk, msf, 0);
724 case IP_BLOCK_SOURCE:
725 case IP_UNBLOCK_SOURCE:
726 case IP_ADD_SOURCE_MEMBERSHIP:
727 case IP_DROP_SOURCE_MEMBERSHIP:
729 struct ip_mreq_source mreqs;
732 if (optlen != sizeof(struct ip_mreq_source))
734 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
738 if (optname == IP_BLOCK_SOURCE) {
739 omode = MCAST_EXCLUDE;
741 } else if (optname == IP_UNBLOCK_SOURCE) {
742 omode = MCAST_EXCLUDE;
744 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
745 struct ip_mreqn mreq;
747 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
748 mreq.imr_address.s_addr = mreqs.imr_interface;
749 mreq.imr_ifindex = 0;
750 err = ip_mc_join_group(sk, &mreq);
751 if (err && err != -EADDRINUSE)
753 omode = MCAST_INCLUDE;
755 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
756 omode = MCAST_INCLUDE;
759 err = ip_mc_source(add, omode, sk, &mreqs, 0);
762 case MCAST_JOIN_GROUP:
763 case MCAST_LEAVE_GROUP:
765 struct group_req greq;
766 struct sockaddr_in *psin;
767 struct ip_mreqn mreq;
769 if (optlen < sizeof(struct group_req))
772 if (copy_from_user(&greq, optval, sizeof(greq)))
774 psin = (struct sockaddr_in *)&greq.gr_group;
775 if (psin->sin_family != AF_INET)
777 memset(&mreq, 0, sizeof(mreq));
778 mreq.imr_multiaddr = psin->sin_addr;
779 mreq.imr_ifindex = greq.gr_interface;
781 if (optname == MCAST_JOIN_GROUP)
782 err = ip_mc_join_group(sk, &mreq);
784 err = ip_mc_leave_group(sk, &mreq);
787 case MCAST_JOIN_SOURCE_GROUP:
788 case MCAST_LEAVE_SOURCE_GROUP:
789 case MCAST_BLOCK_SOURCE:
790 case MCAST_UNBLOCK_SOURCE:
792 struct group_source_req greqs;
793 struct ip_mreq_source mreqs;
794 struct sockaddr_in *psin;
797 if (optlen != sizeof(struct group_source_req))
799 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
803 if (greqs.gsr_group.ss_family != AF_INET ||
804 greqs.gsr_source.ss_family != AF_INET) {
805 err = -EADDRNOTAVAIL;
808 psin = (struct sockaddr_in *)&greqs.gsr_group;
809 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
810 psin = (struct sockaddr_in *)&greqs.gsr_source;
811 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
812 mreqs.imr_interface = 0; /* use index for mc_source */
814 if (optname == MCAST_BLOCK_SOURCE) {
815 omode = MCAST_EXCLUDE;
817 } else if (optname == MCAST_UNBLOCK_SOURCE) {
818 omode = MCAST_EXCLUDE;
820 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
821 struct ip_mreqn mreq;
823 psin = (struct sockaddr_in *)&greqs.gsr_group;
824 mreq.imr_multiaddr = psin->sin_addr;
825 mreq.imr_address.s_addr = 0;
826 mreq.imr_ifindex = greqs.gsr_interface;
827 err = ip_mc_join_group(sk, &mreq);
828 if (err && err != -EADDRINUSE)
830 greqs.gsr_interface = mreq.imr_ifindex;
831 omode = MCAST_INCLUDE;
833 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
834 omode = MCAST_INCLUDE;
837 err = ip_mc_source(add, omode, sk, &mreqs,
838 greqs.gsr_interface);
843 struct sockaddr_in *psin;
844 struct ip_msfilter *msf = NULL;
845 struct group_filter *gsf = NULL;
846 int msize, i, ifindex;
848 if (optlen < GROUP_FILTER_SIZE(0))
850 if (optlen > sysctl_optmem_max) {
854 gsf = kmalloc(optlen, GFP_KERNEL);
860 if (copy_from_user(gsf, optval, optlen))
863 /* numsrc >= (4G-140)/128 overflow in 32 bits */
864 if (gsf->gf_numsrc >= 0x1ffffff ||
865 gsf->gf_numsrc > sysctl_igmp_max_msf) {
869 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
873 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
874 msf = kmalloc(msize, GFP_KERNEL);
879 ifindex = gsf->gf_interface;
880 psin = (struct sockaddr_in *)&gsf->gf_group;
881 if (psin->sin_family != AF_INET) {
882 err = -EADDRNOTAVAIL;
885 msf->imsf_multiaddr = psin->sin_addr.s_addr;
886 msf->imsf_interface = 0;
887 msf->imsf_fmode = gsf->gf_fmode;
888 msf->imsf_numsrc = gsf->gf_numsrc;
889 err = -EADDRNOTAVAIL;
890 for (i = 0; i < gsf->gf_numsrc; ++i) {
891 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
893 if (psin->sin_family != AF_INET)
895 msf->imsf_slist[i] = psin->sin_addr.s_addr;
900 err = ip_mc_msfilter(sk, msf, ifindex);
906 case IP_MULTICAST_ALL:
909 if (val != 0 && val != 1)
913 case IP_ROUTER_ALERT:
914 err = ip_ra_control(sk, val ? 1 : 0, NULL);
920 inet->freebind = !!val;
923 case IP_IPSEC_POLICY:
926 if (!capable(CAP_NET_ADMIN))
928 err = xfrm_user_policy(sk, optname, optval, optlen);
932 if (!capable(CAP_NET_ADMIN)) {
938 inet->transparent = !!val;
944 if (val < 0 || val > 255)
961 int ip_setsockopt(struct sock *sk, int level,
962 int optname, char __user *optval, unsigned int optlen)
969 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
970 #ifdef CONFIG_NETFILTER
971 /* we need to exclude all possible ENOPROTOOPTs except default case */
972 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
973 optname != IP_IPSEC_POLICY &&
974 optname != IP_XFRM_POLICY &&
975 !ip_mroute_opt(optname)) {
977 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
983 EXPORT_SYMBOL(ip_setsockopt);
986 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
987 char __user *optval, unsigned int optlen)
994 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
995 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
998 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
999 #ifdef CONFIG_NETFILTER
1000 /* we need to exclude all possible ENOPROTOOPTs except default case */
1001 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1002 optname != IP_IPSEC_POLICY &&
1003 optname != IP_XFRM_POLICY &&
1004 !ip_mroute_opt(optname)) {
1006 err = compat_nf_setsockopt(sk, PF_INET, optname,
1013 EXPORT_SYMBOL(compat_ip_setsockopt);
1017 * Get the options. Note for future reference. The GET of IP options gets
1018 * the _received_ ones. The set sets the _sent_ ones.
1021 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1022 char __user *optval, int __user *optlen)
1024 struct inet_sock *inet = inet_sk(sk);
1028 if (level != SOL_IP)
1031 if (ip_mroute_opt(optname))
1032 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1034 if (get_user(len, optlen))
1044 unsigned char optbuf[sizeof(struct ip_options)+40];
1045 struct ip_options * opt = (struct ip_options *)optbuf;
1048 memcpy(optbuf, inet->opt,
1049 sizeof(struct ip_options)+
1053 if (opt->optlen == 0)
1054 return put_user(0, optlen);
1056 ip_options_undo(opt);
1058 len = min_t(unsigned int, len, opt->optlen);
1059 if (put_user(len, optlen))
1061 if (copy_to_user(optval, opt->__data, len))
1066 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1069 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1072 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1075 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1078 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1081 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1083 case IP_RECVORIGDSTADDR:
1084 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1090 val = (inet->uc_ttl == -1 ?
1091 sysctl_ip_default_ttl :
1095 val = inet->hdrincl;
1097 case IP_MTU_DISCOVER:
1098 val = inet->pmtudisc;
1102 struct dst_entry *dst;
1104 dst = sk_dst_get(sk);
1116 val = inet->recverr;
1118 case IP_MULTICAST_TTL:
1121 case IP_MULTICAST_LOOP:
1122 val = inet->mc_loop;
1124 case IP_MULTICAST_IF:
1126 struct in_addr addr;
1127 len = min_t(unsigned int, len, sizeof(struct in_addr));
1128 addr.s_addr = inet->mc_addr;
1131 if (put_user(len, optlen))
1133 if (copy_to_user(optval, &addr, len))
1139 struct ip_msfilter msf;
1142 if (len < IP_MSFILTER_SIZE(0)) {
1146 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1150 err = ip_mc_msfget(sk, &msf,
1151 (struct ip_msfilter __user *)optval, optlen);
1155 case MCAST_MSFILTER:
1157 struct group_filter gsf;
1160 if (len < GROUP_FILTER_SIZE(0)) {
1164 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1168 err = ip_mc_gsfget(sk, &gsf,
1169 (struct group_filter __user *)optval,
1174 case IP_MULTICAST_ALL:
1183 if (sk->sk_type != SOCK_STREAM)
1184 return -ENOPROTOOPT;
1186 msg.msg_control = optval;
1187 msg.msg_controllen = len;
1190 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1191 struct in_pktinfo info;
1193 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1194 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1195 info.ipi_ifindex = inet->mc_index;
1196 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1198 if (inet->cmsg_flags & IP_CMSG_TTL) {
1199 int hlim = inet->mc_ttl;
1200 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1202 len -= msg.msg_controllen;
1203 return put_user(len, optlen);
1206 val = inet->freebind;
1208 case IP_TRANSPARENT:
1209 val = inet->transparent;
1212 val = inet->min_ttl;
1216 return -ENOPROTOOPT;
1220 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1221 unsigned char ucval = (unsigned char)val;
1223 if (put_user(len, optlen))
1225 if (copy_to_user(optval, &ucval, 1))
1228 len = min_t(unsigned int, sizeof(int), len);
1229 if (put_user(len, optlen))
1231 if (copy_to_user(optval, &val, len))
1237 int ip_getsockopt(struct sock *sk, int level,
1238 int optname, char __user *optval, int __user *optlen)
1242 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1243 #ifdef CONFIG_NETFILTER
1244 /* we need to exclude all possible ENOPROTOOPTs except default case */
1245 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1246 !ip_mroute_opt(optname)) {
1249 if (get_user(len, optlen))
1253 err = nf_getsockopt(sk, PF_INET, optname, optval,
1257 err = put_user(len, optlen);
1263 EXPORT_SYMBOL(ip_getsockopt);
1265 #ifdef CONFIG_COMPAT
1266 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1267 char __user *optval, int __user *optlen)
1271 if (optname == MCAST_MSFILTER)
1272 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1275 err = do_ip_getsockopt(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_PKTOPTIONS &&
1280 !ip_mroute_opt(optname)) {
1283 if (get_user(len, optlen))
1287 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1290 err = put_user(len, optlen);
1296 EXPORT_SYMBOL(compat_ip_getsockopt);