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>
29 #include <net/tcp_states.h>
30 #include <linux/udp.h>
31 #include <linux/igmp.h>
32 #include <linux/netfilter.h>
33 #include <linux/route.h>
34 #include <linux/mroute.h>
35 #include <net/route.h>
37 #include <net/compat.h>
38 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
39 #include <net/transp_v6.h>
42 #include <linux/errqueue.h>
43 #include <asm/uaccess.h>
45 #define IP_CMSG_PKTINFO 1
48 #define IP_CMSG_RECVOPTS 8
49 #define IP_CMSG_RETOPTS 16
50 #define IP_CMSG_PASSSEC 32
51 #define IP_CMSG_ORIGDSTADDR 64
54 * SOL_IP control messages.
57 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
59 struct in_pktinfo info;
60 struct rtable *rt = skb_rtable(skb);
62 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
64 info.ipi_ifindex = rt->rt_iif;
65 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
68 info.ipi_spec_dst.s_addr = 0;
71 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
74 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
76 int ttl = ip_hdr(skb)->ttl;
77 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
80 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
82 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
85 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
87 if (IPCB(skb)->opt.optlen == 0)
90 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
95 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
97 unsigned char optbuf[sizeof(struct ip_options) + 40];
98 struct ip_options * opt = (struct ip_options *)optbuf;
100 if (IPCB(skb)->opt.optlen == 0)
103 if (ip_options_echo(opt, skb)) {
104 msg->msg_flags |= MSG_CTRUNC;
107 ip_options_undo(opt);
109 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
112 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
118 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
122 err = security_secid_to_secctx(secid, &secdata, &seclen);
126 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
127 security_release_secctx(secdata, seclen);
130 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
132 struct sockaddr_in sin;
133 struct iphdr *iph = ip_hdr(skb);
134 __be16 *ports = (__be16 *)skb_transport_header(skb);
136 if (skb_transport_offset(skb) + 4 > skb->len)
139 /* All current transport protocols have the port numbers in the
140 * first four bytes of the transport header and this function is
141 * written with this assumption in mind.
144 sin.sin_family = AF_INET;
145 sin.sin_addr.s_addr = iph->daddr;
146 sin.sin_port = ports[1];
147 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
149 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
152 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
154 struct inet_sock *inet = inet_sk(skb->sk);
155 unsigned flags = inet->cmsg_flags;
157 /* Ordered by supposed usage frequency */
159 ip_cmsg_recv_pktinfo(msg, skb);
160 if ((flags >>= 1) == 0)
164 ip_cmsg_recv_ttl(msg, skb);
165 if ((flags >>= 1) == 0)
169 ip_cmsg_recv_tos(msg, skb);
170 if ((flags >>= 1) == 0)
174 ip_cmsg_recv_opts(msg, skb);
175 if ((flags >>= 1) == 0)
179 ip_cmsg_recv_retopts(msg, skb);
180 if ((flags >>= 1) == 0)
184 ip_cmsg_recv_security(msg, skb);
186 if ((flags >>= 1) == 0)
189 ip_cmsg_recv_dstaddr(msg, skb);
192 EXPORT_SYMBOL(ip_cmsg_recv);
194 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
197 struct cmsghdr *cmsg;
199 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
200 if (!CMSG_OK(msg, cmsg))
202 if (cmsg->cmsg_level != SOL_IP)
204 switch (cmsg->cmsg_type) {
206 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
207 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
208 err < 40 ? err : 40);
214 struct in_pktinfo *info;
215 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
217 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
218 ipc->oif = info->ipi_ifindex;
219 ipc->addr = info->ipi_spec_dst.s_addr;
230 /* Special input handler for packets caught by router alert option.
231 They are selected only by protocol field, and then processed likely
232 local ones; but only if someone wants them! Otherwise, router
233 not running rsvpd will kill RSVP.
235 It is user level problem, what it will make with them.
236 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
237 but receiver should be enough clever f.e. to forward mtrace requests,
238 sent to multicast group to reach destination designated router.
240 struct ip_ra_chain *ip_ra_chain;
241 DEFINE_RWLOCK(ip_ra_lock);
243 int ip_ra_control(struct sock *sk, unsigned char on,
244 void (*destructor)(struct sock *))
246 struct ip_ra_chain *ra, *new_ra, **rap;
248 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
251 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
253 write_lock_bh(&ip_ra_lock);
254 for (rap = &ip_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
257 write_unlock_bh(&ip_ra_lock);
262 write_unlock_bh(&ip_ra_lock);
271 if (new_ra == NULL) {
272 write_unlock_bh(&ip_ra_lock);
276 new_ra->destructor = destructor;
281 write_unlock_bh(&ip_ra_lock);
286 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
287 __be16 port, u32 info, u8 *payload)
289 struct inet_sock *inet = inet_sk(sk);
290 struct sock_exterr_skb *serr;
295 skb = skb_clone(skb, GFP_ATOMIC);
299 serr = SKB_EXT_ERR(skb);
300 serr->ee.ee_errno = err;
301 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
302 serr->ee.ee_type = icmp_hdr(skb)->type;
303 serr->ee.ee_code = icmp_hdr(skb)->code;
305 serr->ee.ee_info = info;
306 serr->ee.ee_data = 0;
307 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
308 skb_network_header(skb);
311 if (skb_pull(skb, payload - skb->data) != NULL) {
312 skb_reset_transport_header(skb);
313 if (sock_queue_err_skb(sk, skb) == 0)
319 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
321 struct inet_sock *inet = inet_sk(sk);
322 struct sock_exterr_skb *serr;
329 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
333 skb_put(skb, sizeof(struct iphdr));
334 skb_reset_network_header(skb);
338 serr = SKB_EXT_ERR(skb);
339 serr->ee.ee_errno = err;
340 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
341 serr->ee.ee_type = 0;
342 serr->ee.ee_code = 0;
344 serr->ee.ee_info = info;
345 serr->ee.ee_data = 0;
346 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
349 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
350 skb_reset_transport_header(skb);
352 if (sock_queue_err_skb(sk, skb))
357 * Handle MSG_ERRQUEUE
359 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
361 struct sock_exterr_skb *serr;
362 struct sk_buff *skb, *skb2;
363 struct sockaddr_in *sin;
365 struct sock_extended_err ee;
366 struct sockaddr_in offender;
372 skb = skb_dequeue(&sk->sk_error_queue);
378 msg->msg_flags |= MSG_TRUNC;
381 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
385 sock_recv_timestamp(msg, sk, skb);
387 serr = SKB_EXT_ERR(skb);
389 sin = (struct sockaddr_in *)msg->msg_name;
391 sin->sin_family = AF_INET;
392 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
394 sin->sin_port = serr->port;
395 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
398 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
399 sin = &errhdr.offender;
400 sin->sin_family = AF_UNSPEC;
401 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
402 struct inet_sock *inet = inet_sk(sk);
404 sin->sin_family = AF_INET;
405 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
407 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
408 if (inet->cmsg_flags)
409 ip_cmsg_recv(msg, skb);
412 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
414 /* Now we could try to dump offended packet options */
416 msg->msg_flags |= MSG_ERRQUEUE;
419 /* Reset and regenerate socket error */
420 spin_lock_bh(&sk->sk_error_queue.lock);
422 skb2 = skb_peek(&sk->sk_error_queue);
424 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
425 spin_unlock_bh(&sk->sk_error_queue.lock);
426 sk->sk_error_report(sk);
428 spin_unlock_bh(&sk->sk_error_queue.lock);
438 * Socket option code for IP. This is the end of the line after any
439 * TCP,UDP etc options on an IP socket.
442 static int do_ip_setsockopt(struct sock *sk, int level,
443 int optname, char __user *optval, unsigned int optlen)
445 struct inet_sock *inet = inet_sk(sk);
448 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
449 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
450 (1<<IP_RETOPTS) | (1<<IP_TOS) |
451 (1<<IP_TTL) | (1<<IP_HDRINCL) |
452 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
453 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
454 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT))) ||
455 optname == IP_MULTICAST_TTL ||
456 optname == IP_MULTICAST_ALL ||
457 optname == IP_MULTICAST_LOOP ||
458 optname == IP_RECVORIGDSTADDR) {
459 if (optlen >= sizeof(int)) {
460 if (get_user(val, (int __user *) optval))
462 } else if (optlen >= sizeof(char)) {
465 if (get_user(ucval, (unsigned char __user *) optval))
471 /* If optlen==0, it is equivalent to val == 0 */
473 if (ip_mroute_opt(optname))
474 return ip_mroute_setsockopt(sk, optname, optval, optlen);
482 struct ip_options *opt = NULL;
483 if (optlen > 40 || optlen < 0)
485 err = ip_options_get_from_user(sock_net(sk), &opt,
490 struct inet_connection_sock *icsk = inet_csk(sk);
491 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
492 if (sk->sk_family == PF_INET ||
493 (!((1 << sk->sk_state) &
494 (TCPF_LISTEN | TCPF_CLOSE)) &&
495 inet->daddr != LOOPBACK4_IPV6)) {
498 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
500 icsk->icsk_ext_hdr_len += opt->optlen;
501 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
502 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
506 opt = xchg(&inet->opt, opt);
512 inet->cmsg_flags |= IP_CMSG_PKTINFO;
514 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
518 inet->cmsg_flags |= IP_CMSG_TTL;
520 inet->cmsg_flags &= ~IP_CMSG_TTL;
524 inet->cmsg_flags |= IP_CMSG_TOS;
526 inet->cmsg_flags &= ~IP_CMSG_TOS;
530 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
532 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
536 inet->cmsg_flags |= IP_CMSG_RETOPTS;
538 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
542 inet->cmsg_flags |= IP_CMSG_PASSSEC;
544 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
546 case IP_RECVORIGDSTADDR:
548 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
550 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
552 case IP_TOS: /* This sets both TOS and Precedence */
553 if (sk->sk_type == SOCK_STREAM) {
555 val |= inet->tos & 3;
557 if (inet->tos != val) {
559 sk->sk_priority = rt_tos2priority(val);
566 if (val != -1 && (val < 0 || val > 255))
571 if (sk->sk_type != SOCK_RAW) {
575 inet->hdrincl = val ? 1 : 0;
577 case IP_MTU_DISCOVER:
578 if (val < 0 || val > 3)
580 inet->pmtudisc = val;
583 inet->recverr = !!val;
585 skb_queue_purge(&sk->sk_error_queue);
587 case IP_MULTICAST_TTL:
588 if (sk->sk_type == SOCK_STREAM)
594 if (val < 0 || val > 255)
598 case IP_MULTICAST_LOOP:
601 inet->mc_loop = !!val;
603 case IP_MULTICAST_IF:
605 struct ip_mreqn mreq;
606 struct net_device *dev = NULL;
608 if (sk->sk_type == SOCK_STREAM)
611 * Check the arguments are allowable
614 if (optlen < sizeof(struct in_addr))
618 if (optlen >= sizeof(struct ip_mreqn)) {
619 if (copy_from_user(&mreq, optval, sizeof(mreq)))
622 memset(&mreq, 0, sizeof(mreq));
623 if (optlen >= sizeof(struct in_addr) &&
624 copy_from_user(&mreq.imr_address, optval,
625 sizeof(struct in_addr)))
629 if (!mreq.imr_ifindex) {
630 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
636 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
638 mreq.imr_ifindex = dev->ifindex;
642 dev = __dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
645 err = -EADDRNOTAVAIL;
650 if (sk->sk_bound_dev_if &&
651 mreq.imr_ifindex != sk->sk_bound_dev_if)
654 inet->mc_index = mreq.imr_ifindex;
655 inet->mc_addr = mreq.imr_address.s_addr;
660 case IP_ADD_MEMBERSHIP:
661 case IP_DROP_MEMBERSHIP:
663 struct ip_mreqn mreq;
666 if (inet_sk(sk)->is_icsk)
669 if (optlen < sizeof(struct ip_mreq))
672 if (optlen >= sizeof(struct ip_mreqn)) {
673 if (copy_from_user(&mreq, optval, sizeof(mreq)))
676 memset(&mreq, 0, sizeof(mreq));
677 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
681 if (optname == IP_ADD_MEMBERSHIP)
682 err = ip_mc_join_group(sk, &mreq);
684 err = ip_mc_leave_group(sk, &mreq);
689 struct ip_msfilter *msf;
691 if (optlen < IP_MSFILTER_SIZE(0))
693 if (optlen > sysctl_optmem_max) {
697 msf = kmalloc(optlen, GFP_KERNEL);
703 if (copy_from_user(msf, optval, optlen)) {
707 /* numsrc >= (1G-4) overflow in 32 bits */
708 if (msf->imsf_numsrc >= 0x3ffffffcU ||
709 msf->imsf_numsrc > sysctl_igmp_max_msf) {
714 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
719 err = ip_mc_msfilter(sk, msf, 0);
723 case IP_BLOCK_SOURCE:
724 case IP_UNBLOCK_SOURCE:
725 case IP_ADD_SOURCE_MEMBERSHIP:
726 case IP_DROP_SOURCE_MEMBERSHIP:
728 struct ip_mreq_source mreqs;
731 if (optlen != sizeof(struct ip_mreq_source))
733 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
737 if (optname == IP_BLOCK_SOURCE) {
738 omode = MCAST_EXCLUDE;
740 } else if (optname == IP_UNBLOCK_SOURCE) {
741 omode = MCAST_EXCLUDE;
743 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
744 struct ip_mreqn mreq;
746 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
747 mreq.imr_address.s_addr = mreqs.imr_interface;
748 mreq.imr_ifindex = 0;
749 err = ip_mc_join_group(sk, &mreq);
750 if (err && err != -EADDRINUSE)
752 omode = MCAST_INCLUDE;
754 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
755 omode = MCAST_INCLUDE;
758 err = ip_mc_source(add, omode, sk, &mreqs, 0);
761 case MCAST_JOIN_GROUP:
762 case MCAST_LEAVE_GROUP:
764 struct group_req greq;
765 struct sockaddr_in *psin;
766 struct ip_mreqn mreq;
768 if (optlen < sizeof(struct group_req))
771 if (copy_from_user(&greq, optval, sizeof(greq)))
773 psin = (struct sockaddr_in *)&greq.gr_group;
774 if (psin->sin_family != AF_INET)
776 memset(&mreq, 0, sizeof(mreq));
777 mreq.imr_multiaddr = psin->sin_addr;
778 mreq.imr_ifindex = greq.gr_interface;
780 if (optname == MCAST_JOIN_GROUP)
781 err = ip_mc_join_group(sk, &mreq);
783 err = ip_mc_leave_group(sk, &mreq);
786 case MCAST_JOIN_SOURCE_GROUP:
787 case MCAST_LEAVE_SOURCE_GROUP:
788 case MCAST_BLOCK_SOURCE:
789 case MCAST_UNBLOCK_SOURCE:
791 struct group_source_req greqs;
792 struct ip_mreq_source mreqs;
793 struct sockaddr_in *psin;
796 if (optlen != sizeof(struct group_source_req))
798 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
802 if (greqs.gsr_group.ss_family != AF_INET ||
803 greqs.gsr_source.ss_family != AF_INET) {
804 err = -EADDRNOTAVAIL;
807 psin = (struct sockaddr_in *)&greqs.gsr_group;
808 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
809 psin = (struct sockaddr_in *)&greqs.gsr_source;
810 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
811 mreqs.imr_interface = 0; /* use index for mc_source */
813 if (optname == MCAST_BLOCK_SOURCE) {
814 omode = MCAST_EXCLUDE;
816 } else if (optname == MCAST_UNBLOCK_SOURCE) {
817 omode = MCAST_EXCLUDE;
819 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
820 struct ip_mreqn mreq;
822 psin = (struct sockaddr_in *)&greqs.gsr_group;
823 mreq.imr_multiaddr = psin->sin_addr;
824 mreq.imr_address.s_addr = 0;
825 mreq.imr_ifindex = greqs.gsr_interface;
826 err = ip_mc_join_group(sk, &mreq);
827 if (err && err != -EADDRINUSE)
829 greqs.gsr_interface = mreq.imr_ifindex;
830 omode = MCAST_INCLUDE;
832 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
833 omode = MCAST_INCLUDE;
836 err = ip_mc_source(add, omode, sk, &mreqs,
837 greqs.gsr_interface);
842 struct sockaddr_in *psin;
843 struct ip_msfilter *msf = NULL;
844 struct group_filter *gsf = NULL;
845 int msize, i, ifindex;
847 if (optlen < GROUP_FILTER_SIZE(0))
849 if (optlen > sysctl_optmem_max) {
853 gsf = kmalloc(optlen, GFP_KERNEL);
859 if (copy_from_user(gsf, optval, optlen))
862 /* numsrc >= (4G-140)/128 overflow in 32 bits */
863 if (gsf->gf_numsrc >= 0x1ffffff ||
864 gsf->gf_numsrc > sysctl_igmp_max_msf) {
868 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
872 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
873 msf = kmalloc(msize, GFP_KERNEL);
878 ifindex = gsf->gf_interface;
879 psin = (struct sockaddr_in *)&gsf->gf_group;
880 if (psin->sin_family != AF_INET) {
881 err = -EADDRNOTAVAIL;
884 msf->imsf_multiaddr = psin->sin_addr.s_addr;
885 msf->imsf_interface = 0;
886 msf->imsf_fmode = gsf->gf_fmode;
887 msf->imsf_numsrc = gsf->gf_numsrc;
888 err = -EADDRNOTAVAIL;
889 for (i = 0; i < gsf->gf_numsrc; ++i) {
890 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
892 if (psin->sin_family != AF_INET)
894 msf->imsf_slist[i] = psin->sin_addr.s_addr;
899 err = ip_mc_msfilter(sk, msf, ifindex);
905 case IP_MULTICAST_ALL:
908 if (val != 0 && val != 1)
912 case IP_ROUTER_ALERT:
913 err = ip_ra_control(sk, val ? 1 : 0, NULL);
919 inet->freebind = !!val;
922 case IP_IPSEC_POLICY:
925 if (!capable(CAP_NET_ADMIN))
927 err = xfrm_user_policy(sk, optname, optval, optlen);
931 if (!capable(CAP_NET_ADMIN)) {
937 inet->transparent = !!val;
952 int ip_setsockopt(struct sock *sk, int level,
953 int optname, char __user *optval, unsigned int optlen)
960 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
961 #ifdef CONFIG_NETFILTER
962 /* we need to exclude all possible ENOPROTOOPTs except default case */
963 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
964 optname != IP_IPSEC_POLICY &&
965 optname != IP_XFRM_POLICY &&
966 !ip_mroute_opt(optname)) {
968 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
974 EXPORT_SYMBOL(ip_setsockopt);
977 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
978 char __user *optval, unsigned int optlen)
985 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
986 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
989 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
990 #ifdef CONFIG_NETFILTER
991 /* we need to exclude all possible ENOPROTOOPTs except default case */
992 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
993 optname != IP_IPSEC_POLICY &&
994 optname != IP_XFRM_POLICY &&
995 !ip_mroute_opt(optname)) {
997 err = compat_nf_setsockopt(sk, PF_INET, optname,
1004 EXPORT_SYMBOL(compat_ip_setsockopt);
1008 * Get the options. Note for future reference. The GET of IP options gets
1009 * the _received_ ones. The set sets the _sent_ ones.
1012 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1013 char __user *optval, int __user *optlen)
1015 struct inet_sock *inet = inet_sk(sk);
1019 if (level != SOL_IP)
1022 if (ip_mroute_opt(optname))
1023 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1025 if (get_user(len, optlen))
1035 unsigned char optbuf[sizeof(struct ip_options)+40];
1036 struct ip_options * opt = (struct ip_options *)optbuf;
1039 memcpy(optbuf, inet->opt,
1040 sizeof(struct ip_options)+
1044 if (opt->optlen == 0)
1045 return put_user(0, optlen);
1047 ip_options_undo(opt);
1049 len = min_t(unsigned int, len, opt->optlen);
1050 if (put_user(len, optlen))
1052 if (copy_to_user(optval, opt->__data, len))
1057 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1060 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1063 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1066 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1069 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1072 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1074 case IP_RECVORIGDSTADDR:
1075 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1081 val = (inet->uc_ttl == -1 ?
1082 sysctl_ip_default_ttl :
1086 val = inet->hdrincl;
1088 case IP_MTU_DISCOVER:
1089 val = inet->pmtudisc;
1093 struct dst_entry *dst;
1095 dst = sk_dst_get(sk);
1107 val = inet->recverr;
1109 case IP_MULTICAST_TTL:
1112 case IP_MULTICAST_LOOP:
1113 val = inet->mc_loop;
1115 case IP_MULTICAST_IF:
1117 struct in_addr addr;
1118 len = min_t(unsigned int, len, sizeof(struct in_addr));
1119 addr.s_addr = inet->mc_addr;
1122 if (put_user(len, optlen))
1124 if (copy_to_user(optval, &addr, len))
1130 struct ip_msfilter msf;
1133 if (len < IP_MSFILTER_SIZE(0)) {
1137 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1141 err = ip_mc_msfget(sk, &msf,
1142 (struct ip_msfilter __user *)optval, optlen);
1146 case MCAST_MSFILTER:
1148 struct group_filter gsf;
1151 if (len < GROUP_FILTER_SIZE(0)) {
1155 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1159 err = ip_mc_gsfget(sk, &gsf,
1160 (struct group_filter __user *)optval,
1165 case IP_MULTICAST_ALL:
1174 if (sk->sk_type != SOCK_STREAM)
1175 return -ENOPROTOOPT;
1177 msg.msg_control = optval;
1178 msg.msg_controllen = len;
1181 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1182 struct in_pktinfo info;
1184 info.ipi_addr.s_addr = inet->rcv_saddr;
1185 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1186 info.ipi_ifindex = inet->mc_index;
1187 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1189 if (inet->cmsg_flags & IP_CMSG_TTL) {
1190 int hlim = inet->mc_ttl;
1191 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1193 len -= msg.msg_controllen;
1194 return put_user(len, optlen);
1197 val = inet->freebind;
1199 case IP_TRANSPARENT:
1200 val = inet->transparent;
1204 return -ENOPROTOOPT;
1208 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1209 unsigned char ucval = (unsigned char)val;
1211 if (put_user(len, optlen))
1213 if (copy_to_user(optval, &ucval, 1))
1216 len = min_t(unsigned int, sizeof(int), len);
1217 if (put_user(len, optlen))
1219 if (copy_to_user(optval, &val, len))
1225 int ip_getsockopt(struct sock *sk, int level,
1226 int optname, char __user *optval, int __user *optlen)
1230 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1231 #ifdef CONFIG_NETFILTER
1232 /* we need to exclude all possible ENOPROTOOPTs except default case */
1233 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1234 !ip_mroute_opt(optname)) {
1237 if (get_user(len, optlen))
1241 err = nf_getsockopt(sk, PF_INET, optname, optval,
1245 err = put_user(len, optlen);
1251 EXPORT_SYMBOL(ip_getsockopt);
1253 #ifdef CONFIG_COMPAT
1254 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1255 char __user *optval, int __user *optlen)
1259 if (optname == MCAST_MSFILTER)
1260 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1263 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1265 #ifdef CONFIG_NETFILTER
1266 /* we need to exclude all possible ENOPROTOOPTs except default case */
1267 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1268 !ip_mroute_opt(optname)) {
1271 if (get_user(len, optlen))
1275 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1278 err = put_user(len, optlen);
1284 EXPORT_SYMBOL(compat_ip_getsockopt);