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>
43 #include <net/ip_fib.h>
45 #include <linux/errqueue.h>
46 #include <asm/uaccess.h>
48 #define IP_CMSG_PKTINFO 1
51 #define IP_CMSG_RECVOPTS 8
52 #define IP_CMSG_RETOPTS 16
53 #define IP_CMSG_PASSSEC 32
54 #define IP_CMSG_ORIGDSTADDR 64
57 * SOL_IP control messages.
59 #define PKTINFO_SKB_CB(__skb) ((struct in_pktinfo *)((__skb)->cb))
61 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
63 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
65 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
67 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
70 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
72 int ttl = ip_hdr(skb)->ttl;
73 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
76 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
78 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
81 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
83 if (IPCB(skb)->opt.optlen == 0)
86 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
91 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
93 unsigned char optbuf[sizeof(struct ip_options) + 40];
94 struct ip_options *opt = (struct ip_options *)optbuf;
96 if (IPCB(skb)->opt.optlen == 0)
99 if (ip_options_echo(opt, skb)) {
100 msg->msg_flags |= MSG_CTRUNC;
103 ip_options_undo(opt);
105 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
108 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
114 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
118 err = security_secid_to_secctx(secid, &secdata, &seclen);
122 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
123 security_release_secctx(secdata, seclen);
126 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
128 struct sockaddr_in sin;
129 const struct iphdr *iph = ip_hdr(skb);
130 __be16 *ports = (__be16 *)skb_transport_header(skb);
132 if (skb_transport_offset(skb) + 4 > skb->len)
135 /* All current transport protocols have the port numbers in the
136 * first four bytes of the transport header and this function is
137 * written with this assumption in mind.
140 sin.sin_family = AF_INET;
141 sin.sin_addr.s_addr = iph->daddr;
142 sin.sin_port = ports[1];
143 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
145 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
148 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
150 struct inet_sock *inet = inet_sk(skb->sk);
151 unsigned int flags = inet->cmsg_flags;
153 /* Ordered by supposed usage frequency */
155 ip_cmsg_recv_pktinfo(msg, skb);
156 if ((flags >>= 1) == 0)
160 ip_cmsg_recv_ttl(msg, skb);
161 if ((flags >>= 1) == 0)
165 ip_cmsg_recv_tos(msg, skb);
166 if ((flags >>= 1) == 0)
170 ip_cmsg_recv_opts(msg, skb);
171 if ((flags >>= 1) == 0)
175 ip_cmsg_recv_retopts(msg, skb);
176 if ((flags >>= 1) == 0)
180 ip_cmsg_recv_security(msg, skb);
182 if ((flags >>= 1) == 0)
185 ip_cmsg_recv_dstaddr(msg, skb);
188 EXPORT_SYMBOL(ip_cmsg_recv);
190 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
193 struct cmsghdr *cmsg;
195 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
196 if (!CMSG_OK(msg, cmsg))
198 if (cmsg->cmsg_level != SOL_IP)
200 switch (cmsg->cmsg_type) {
202 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
203 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
204 err < 40 ? err : 40);
210 struct in_pktinfo *info;
211 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
213 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
214 ipc->oif = info->ipi_ifindex;
215 ipc->addr = info->ipi_spec_dst.s_addr;
226 /* Special input handler for packets caught by router alert option.
227 They are selected only by protocol field, and then processed likely
228 local ones; but only if someone wants them! Otherwise, router
229 not running rsvpd will kill RSVP.
231 It is user level problem, what it will make with them.
232 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
233 but receiver should be enough clever f.e. to forward mtrace requests,
234 sent to multicast group to reach destination designated router.
236 struct ip_ra_chain __rcu *ip_ra_chain;
237 static DEFINE_SPINLOCK(ip_ra_lock);
240 static void ip_ra_destroy_rcu(struct rcu_head *head)
242 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
244 sock_put(ra->saved_sk);
248 int ip_ra_control(struct sock *sk, unsigned char on,
249 void (*destructor)(struct sock *))
251 struct ip_ra_chain *ra, *new_ra;
252 struct ip_ra_chain __rcu **rap;
254 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
257 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
259 spin_lock_bh(&ip_ra_lock);
260 for (rap = &ip_ra_chain;
261 (ra = rcu_dereference_protected(*rap,
262 lockdep_is_held(&ip_ra_lock))) != NULL;
266 spin_unlock_bh(&ip_ra_lock);
270 /* dont let ip_call_ra_chain() use sk again */
272 rcu_assign_pointer(*rap, ra->next);
273 spin_unlock_bh(&ip_ra_lock);
278 * Delay sock_put(sk) and kfree(ra) after one rcu grace
279 * period. This guarantee ip_call_ra_chain() dont need
280 * to mess with socket refcounts.
283 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
287 if (new_ra == NULL) {
288 spin_unlock_bh(&ip_ra_lock);
292 new_ra->destructor = destructor;
295 rcu_assign_pointer(*rap, new_ra);
297 spin_unlock_bh(&ip_ra_lock);
302 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
303 __be16 port, u32 info, u8 *payload)
305 struct sock_exterr_skb *serr;
307 skb = skb_clone(skb, GFP_ATOMIC);
311 serr = SKB_EXT_ERR(skb);
312 serr->ee.ee_errno = err;
313 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
314 serr->ee.ee_type = icmp_hdr(skb)->type;
315 serr->ee.ee_code = icmp_hdr(skb)->code;
317 serr->ee.ee_info = info;
318 serr->ee.ee_data = 0;
319 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
320 skb_network_header(skb);
323 if (skb_pull(skb, payload - skb->data) != NULL) {
324 skb_reset_transport_header(skb);
325 if (sock_queue_err_skb(sk, skb) == 0)
331 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
333 struct inet_sock *inet = inet_sk(sk);
334 struct sock_exterr_skb *serr;
341 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
345 skb_put(skb, sizeof(struct iphdr));
346 skb_reset_network_header(skb);
350 serr = SKB_EXT_ERR(skb);
351 serr->ee.ee_errno = err;
352 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
353 serr->ee.ee_type = 0;
354 serr->ee.ee_code = 0;
356 serr->ee.ee_info = info;
357 serr->ee.ee_data = 0;
358 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
361 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
362 skb_reset_transport_header(skb);
364 if (sock_queue_err_skb(sk, skb))
369 * Handle MSG_ERRQUEUE
371 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
373 struct sock_exterr_skb *serr;
374 struct sk_buff *skb, *skb2;
375 struct sockaddr_in *sin;
377 struct sock_extended_err ee;
378 struct sockaddr_in offender;
384 skb = skb_dequeue(&sk->sk_error_queue);
390 msg->msg_flags |= MSG_TRUNC;
393 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
397 sock_recv_timestamp(msg, sk, skb);
399 serr = SKB_EXT_ERR(skb);
401 sin = (struct sockaddr_in *)msg->msg_name;
403 sin->sin_family = AF_INET;
404 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
406 sin->sin_port = serr->port;
407 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
408 *addr_len = sizeof(*sin);
411 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
412 sin = &errhdr.offender;
413 sin->sin_family = AF_UNSPEC;
414 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
415 struct inet_sock *inet = inet_sk(sk);
417 sin->sin_family = AF_INET;
418 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
420 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
421 if (inet->cmsg_flags)
422 ip_cmsg_recv(msg, skb);
425 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
427 /* Now we could try to dump offended packet options */
429 msg->msg_flags |= MSG_ERRQUEUE;
432 /* Reset and regenerate socket error */
433 spin_lock_bh(&sk->sk_error_queue.lock);
435 skb2 = skb_peek(&sk->sk_error_queue);
437 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
438 spin_unlock_bh(&sk->sk_error_queue.lock);
439 sk->sk_error_report(sk);
441 spin_unlock_bh(&sk->sk_error_queue.lock);
451 * Socket option code for IP. This is the end of the line after any
452 * TCP,UDP etc options on an IP socket.
455 static int do_ip_setsockopt(struct sock *sk, int level,
456 int optname, char __user *optval, unsigned int optlen)
458 struct inet_sock *inet = inet_sk(sk);
470 case IP_MTU_DISCOVER:
472 case IP_ROUTER_ALERT:
479 case IP_MULTICAST_TTL:
480 case IP_MULTICAST_ALL:
481 case IP_MULTICAST_LOOP:
482 case IP_RECVORIGDSTADDR:
483 if (optlen >= sizeof(int)) {
484 if (get_user(val, (int __user *) optval))
486 } else if (optlen >= sizeof(char)) {
489 if (get_user(ucval, (unsigned char __user *) optval))
495 /* If optlen==0, it is equivalent to val == 0 */
497 if (ip_mroute_opt(optname))
498 return ip_mroute_setsockopt(sk, optname, optval, optlen);
506 struct ip_options_rcu *old, *opt = NULL;
510 err = ip_options_get_from_user(sock_net(sk), &opt,
514 old = rcu_dereference_protected(inet->inet_opt,
515 sock_owned_by_user(sk));
517 struct inet_connection_sock *icsk = inet_csk(sk);
518 #if IS_ENABLED(CONFIG_IPV6)
519 if (sk->sk_family == PF_INET ||
520 (!((1 << sk->sk_state) &
521 (TCPF_LISTEN | TCPF_CLOSE)) &&
522 inet->inet_daddr != LOOPBACK4_IPV6)) {
525 icsk->icsk_ext_hdr_len -= old->opt.optlen;
527 icsk->icsk_ext_hdr_len += opt->opt.optlen;
528 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
529 #if IS_ENABLED(CONFIG_IPV6)
533 rcu_assign_pointer(inet->inet_opt, opt);
540 inet->cmsg_flags |= IP_CMSG_PKTINFO;
542 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
546 inet->cmsg_flags |= IP_CMSG_TTL;
548 inet->cmsg_flags &= ~IP_CMSG_TTL;
552 inet->cmsg_flags |= IP_CMSG_TOS;
554 inet->cmsg_flags &= ~IP_CMSG_TOS;
558 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
560 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
564 inet->cmsg_flags |= IP_CMSG_RETOPTS;
566 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
570 inet->cmsg_flags |= IP_CMSG_PASSSEC;
572 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
574 case IP_RECVORIGDSTADDR:
576 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
578 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
580 case IP_TOS: /* This sets both TOS and Precedence */
581 if (sk->sk_type == SOCK_STREAM) {
582 val &= ~INET_ECN_MASK;
583 val |= inet->tos & INET_ECN_MASK;
585 if (inet->tos != val) {
587 sk->sk_priority = rt_tos2priority(val);
594 if (val != -1 && (val < 1 || val > 255))
599 if (sk->sk_type != SOCK_RAW) {
603 inet->hdrincl = val ? 1 : 0;
606 if (sk->sk_type != SOCK_RAW) {
610 inet->nodefrag = val ? 1 : 0;
612 case IP_MTU_DISCOVER:
613 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
615 inet->pmtudisc = val;
618 inet->recverr = !!val;
620 skb_queue_purge(&sk->sk_error_queue);
622 case IP_MULTICAST_TTL:
623 if (sk->sk_type == SOCK_STREAM)
629 if (val < 0 || val > 255)
633 case IP_MULTICAST_LOOP:
636 inet->mc_loop = !!val;
640 struct net_device *dev = NULL;
643 if (optlen != sizeof(int))
646 ifindex = (__force int)ntohl((__force __be32)val);
653 dev = dev_get_by_index(sock_net(sk), ifindex);
654 err = -EADDRNOTAVAIL;
660 if (sk->sk_bound_dev_if)
663 inet->uc_index = ifindex;
667 case IP_MULTICAST_IF:
669 struct ip_mreqn mreq;
670 struct net_device *dev = NULL;
672 if (sk->sk_type == SOCK_STREAM)
675 * Check the arguments are allowable
678 if (optlen < sizeof(struct in_addr))
682 if (optlen >= sizeof(struct ip_mreqn)) {
683 if (copy_from_user(&mreq, optval, sizeof(mreq)))
686 memset(&mreq, 0, sizeof(mreq));
687 if (optlen >= sizeof(struct ip_mreq)) {
688 if (copy_from_user(&mreq, optval,
689 sizeof(struct ip_mreq)))
691 } else if (optlen >= sizeof(struct in_addr)) {
692 if (copy_from_user(&mreq.imr_address, optval,
693 sizeof(struct in_addr)))
698 if (!mreq.imr_ifindex) {
699 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
705 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
707 mreq.imr_ifindex = dev->ifindex;
709 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
712 err = -EADDRNOTAVAIL;
718 if (sk->sk_bound_dev_if &&
719 mreq.imr_ifindex != sk->sk_bound_dev_if)
722 inet->mc_index = mreq.imr_ifindex;
723 inet->mc_addr = mreq.imr_address.s_addr;
728 case IP_ADD_MEMBERSHIP:
729 case IP_DROP_MEMBERSHIP:
731 struct ip_mreqn mreq;
734 if (inet_sk(sk)->is_icsk)
737 if (optlen < sizeof(struct ip_mreq))
740 if (optlen >= sizeof(struct ip_mreqn)) {
741 if (copy_from_user(&mreq, optval, sizeof(mreq)))
744 memset(&mreq, 0, sizeof(mreq));
745 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
749 if (optname == IP_ADD_MEMBERSHIP)
750 err = ip_mc_join_group(sk, &mreq);
752 err = ip_mc_leave_group(sk, &mreq);
757 struct ip_msfilter *msf;
759 if (optlen < IP_MSFILTER_SIZE(0))
761 if (optlen > sysctl_optmem_max) {
765 msf = kmalloc(optlen, GFP_KERNEL);
771 if (copy_from_user(msf, optval, optlen)) {
775 /* numsrc >= (1G-4) overflow in 32 bits */
776 if (msf->imsf_numsrc >= 0x3ffffffcU ||
777 msf->imsf_numsrc > sysctl_igmp_max_msf) {
782 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
787 err = ip_mc_msfilter(sk, msf, 0);
791 case IP_BLOCK_SOURCE:
792 case IP_UNBLOCK_SOURCE:
793 case IP_ADD_SOURCE_MEMBERSHIP:
794 case IP_DROP_SOURCE_MEMBERSHIP:
796 struct ip_mreq_source mreqs;
799 if (optlen != sizeof(struct ip_mreq_source))
801 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
805 if (optname == IP_BLOCK_SOURCE) {
806 omode = MCAST_EXCLUDE;
808 } else if (optname == IP_UNBLOCK_SOURCE) {
809 omode = MCAST_EXCLUDE;
811 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
812 struct ip_mreqn mreq;
814 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
815 mreq.imr_address.s_addr = mreqs.imr_interface;
816 mreq.imr_ifindex = 0;
817 err = ip_mc_join_group(sk, &mreq);
818 if (err && err != -EADDRINUSE)
820 omode = MCAST_INCLUDE;
822 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
823 omode = MCAST_INCLUDE;
826 err = ip_mc_source(add, omode, sk, &mreqs, 0);
829 case MCAST_JOIN_GROUP:
830 case MCAST_LEAVE_GROUP:
832 struct group_req greq;
833 struct sockaddr_in *psin;
834 struct ip_mreqn mreq;
836 if (optlen < sizeof(struct group_req))
839 if (copy_from_user(&greq, optval, sizeof(greq)))
841 psin = (struct sockaddr_in *)&greq.gr_group;
842 if (psin->sin_family != AF_INET)
844 memset(&mreq, 0, sizeof(mreq));
845 mreq.imr_multiaddr = psin->sin_addr;
846 mreq.imr_ifindex = greq.gr_interface;
848 if (optname == MCAST_JOIN_GROUP)
849 err = ip_mc_join_group(sk, &mreq);
851 err = ip_mc_leave_group(sk, &mreq);
854 case MCAST_JOIN_SOURCE_GROUP:
855 case MCAST_LEAVE_SOURCE_GROUP:
856 case MCAST_BLOCK_SOURCE:
857 case MCAST_UNBLOCK_SOURCE:
859 struct group_source_req greqs;
860 struct ip_mreq_source mreqs;
861 struct sockaddr_in *psin;
864 if (optlen != sizeof(struct group_source_req))
866 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
870 if (greqs.gsr_group.ss_family != AF_INET ||
871 greqs.gsr_source.ss_family != AF_INET) {
872 err = -EADDRNOTAVAIL;
875 psin = (struct sockaddr_in *)&greqs.gsr_group;
876 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
877 psin = (struct sockaddr_in *)&greqs.gsr_source;
878 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
879 mreqs.imr_interface = 0; /* use index for mc_source */
881 if (optname == MCAST_BLOCK_SOURCE) {
882 omode = MCAST_EXCLUDE;
884 } else if (optname == MCAST_UNBLOCK_SOURCE) {
885 omode = MCAST_EXCLUDE;
887 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
888 struct ip_mreqn mreq;
890 psin = (struct sockaddr_in *)&greqs.gsr_group;
891 mreq.imr_multiaddr = psin->sin_addr;
892 mreq.imr_address.s_addr = 0;
893 mreq.imr_ifindex = greqs.gsr_interface;
894 err = ip_mc_join_group(sk, &mreq);
895 if (err && err != -EADDRINUSE)
897 greqs.gsr_interface = mreq.imr_ifindex;
898 omode = MCAST_INCLUDE;
900 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
901 omode = MCAST_INCLUDE;
904 err = ip_mc_source(add, omode, sk, &mreqs,
905 greqs.gsr_interface);
910 struct sockaddr_in *psin;
911 struct ip_msfilter *msf = NULL;
912 struct group_filter *gsf = NULL;
913 int msize, i, ifindex;
915 if (optlen < GROUP_FILTER_SIZE(0))
917 if (optlen > sysctl_optmem_max) {
921 gsf = kmalloc(optlen, GFP_KERNEL);
927 if (copy_from_user(gsf, optval, optlen))
930 /* numsrc >= (4G-140)/128 overflow in 32 bits */
931 if (gsf->gf_numsrc >= 0x1ffffff ||
932 gsf->gf_numsrc > sysctl_igmp_max_msf) {
936 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
940 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
941 msf = kmalloc(msize, GFP_KERNEL);
946 ifindex = gsf->gf_interface;
947 psin = (struct sockaddr_in *)&gsf->gf_group;
948 if (psin->sin_family != AF_INET) {
949 err = -EADDRNOTAVAIL;
952 msf->imsf_multiaddr = psin->sin_addr.s_addr;
953 msf->imsf_interface = 0;
954 msf->imsf_fmode = gsf->gf_fmode;
955 msf->imsf_numsrc = gsf->gf_numsrc;
956 err = -EADDRNOTAVAIL;
957 for (i = 0; i < gsf->gf_numsrc; ++i) {
958 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
960 if (psin->sin_family != AF_INET)
962 msf->imsf_slist[i] = psin->sin_addr.s_addr;
967 err = ip_mc_msfilter(sk, msf, ifindex);
973 case IP_MULTICAST_ALL:
976 if (val != 0 && val != 1)
980 case IP_ROUTER_ALERT:
981 err = ip_ra_control(sk, val ? 1 : 0, NULL);
987 inet->freebind = !!val;
990 case IP_IPSEC_POLICY:
993 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
995 err = xfrm_user_policy(sk, optname, optval, optlen);
999 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1000 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1006 inet->transparent = !!val;
1012 if (val < 0 || val > 255)
1014 inet->min_ttl = val;
1030 * ipv4_pktinfo_prepare - transfert some info from rtable to skb
1034 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1035 * destination in skb->cb[] before dst drop.
1036 * This way, receiver doesnt make cache line misses to read rtable.
1038 void ipv4_pktinfo_prepare(struct sk_buff *skb)
1040 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1042 if (skb_rtable(skb)) {
1043 pktinfo->ipi_ifindex = inet_iif(skb);
1044 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1046 pktinfo->ipi_ifindex = 0;
1047 pktinfo->ipi_spec_dst.s_addr = 0;
1052 int ip_setsockopt(struct sock *sk, int level,
1053 int optname, char __user *optval, unsigned int optlen)
1057 if (level != SOL_IP)
1058 return -ENOPROTOOPT;
1060 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1061 #ifdef CONFIG_NETFILTER
1062 /* we need to exclude all possible ENOPROTOOPTs except default case */
1063 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1064 optname != IP_IPSEC_POLICY &&
1065 optname != IP_XFRM_POLICY &&
1066 !ip_mroute_opt(optname)) {
1068 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1074 EXPORT_SYMBOL(ip_setsockopt);
1076 #ifdef CONFIG_COMPAT
1077 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1078 char __user *optval, unsigned int optlen)
1082 if (level != SOL_IP)
1083 return -ENOPROTOOPT;
1085 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1086 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1089 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1090 #ifdef CONFIG_NETFILTER
1091 /* we need to exclude all possible ENOPROTOOPTs except default case */
1092 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1093 optname != IP_IPSEC_POLICY &&
1094 optname != IP_XFRM_POLICY &&
1095 !ip_mroute_opt(optname)) {
1097 err = compat_nf_setsockopt(sk, PF_INET, optname,
1104 EXPORT_SYMBOL(compat_ip_setsockopt);
1108 * Get the options. Note for future reference. The GET of IP options gets
1109 * the _received_ ones. The set sets the _sent_ ones.
1112 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1113 char __user *optval, int __user *optlen, unsigned int flags)
1115 struct inet_sock *inet = inet_sk(sk);
1119 if (level != SOL_IP)
1122 if (ip_mroute_opt(optname))
1123 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1125 if (get_user(len, optlen))
1135 unsigned char optbuf[sizeof(struct ip_options)+40];
1136 struct ip_options *opt = (struct ip_options *)optbuf;
1137 struct ip_options_rcu *inet_opt;
1139 inet_opt = rcu_dereference_protected(inet->inet_opt,
1140 sock_owned_by_user(sk));
1143 memcpy(optbuf, &inet_opt->opt,
1144 sizeof(struct ip_options) +
1145 inet_opt->opt.optlen);
1148 if (opt->optlen == 0)
1149 return put_user(0, optlen);
1151 ip_options_undo(opt);
1153 len = min_t(unsigned int, len, opt->optlen);
1154 if (put_user(len, optlen))
1156 if (copy_to_user(optval, opt->__data, len))
1161 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1164 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1167 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1170 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1173 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1176 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1178 case IP_RECVORIGDSTADDR:
1179 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1185 val = (inet->uc_ttl == -1 ?
1186 sysctl_ip_default_ttl :
1190 val = inet->hdrincl;
1193 val = inet->nodefrag;
1195 case IP_MTU_DISCOVER:
1196 val = inet->pmtudisc;
1200 struct dst_entry *dst;
1202 dst = sk_dst_get(sk);
1214 val = inet->recverr;
1216 case IP_MULTICAST_TTL:
1219 case IP_MULTICAST_LOOP:
1220 val = inet->mc_loop;
1223 val = (__force int)htonl((__u32) inet->uc_index);
1225 case IP_MULTICAST_IF:
1227 struct in_addr addr;
1228 len = min_t(unsigned int, len, sizeof(struct in_addr));
1229 addr.s_addr = inet->mc_addr;
1232 if (put_user(len, optlen))
1234 if (copy_to_user(optval, &addr, len))
1240 struct ip_msfilter msf;
1243 if (len < IP_MSFILTER_SIZE(0)) {
1247 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1251 err = ip_mc_msfget(sk, &msf,
1252 (struct ip_msfilter __user *)optval, optlen);
1256 case MCAST_MSFILTER:
1258 struct group_filter gsf;
1261 if (len < GROUP_FILTER_SIZE(0)) {
1265 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1269 err = ip_mc_gsfget(sk, &gsf,
1270 (struct group_filter __user *)optval,
1275 case IP_MULTICAST_ALL:
1284 if (sk->sk_type != SOCK_STREAM)
1285 return -ENOPROTOOPT;
1287 msg.msg_control = optval;
1288 msg.msg_controllen = len;
1289 msg.msg_flags = flags;
1291 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1292 struct in_pktinfo info;
1294 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1295 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1296 info.ipi_ifindex = inet->mc_index;
1297 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1299 if (inet->cmsg_flags & IP_CMSG_TTL) {
1300 int hlim = inet->mc_ttl;
1301 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1303 if (inet->cmsg_flags & IP_CMSG_TOS) {
1304 int tos = inet->rcv_tos;
1305 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1307 len -= msg.msg_controllen;
1308 return put_user(len, optlen);
1311 val = inet->freebind;
1313 case IP_TRANSPARENT:
1314 val = inet->transparent;
1317 val = inet->min_ttl;
1321 return -ENOPROTOOPT;
1325 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1326 unsigned char ucval = (unsigned char)val;
1328 if (put_user(len, optlen))
1330 if (copy_to_user(optval, &ucval, 1))
1333 len = min_t(unsigned int, sizeof(int), len);
1334 if (put_user(len, optlen))
1336 if (copy_to_user(optval, &val, len))
1342 int ip_getsockopt(struct sock *sk, int level,
1343 int optname, char __user *optval, int __user *optlen)
1347 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
1348 #ifdef CONFIG_NETFILTER
1349 /* we need to exclude all possible ENOPROTOOPTs except default case */
1350 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1351 !ip_mroute_opt(optname)) {
1354 if (get_user(len, optlen))
1358 err = nf_getsockopt(sk, PF_INET, optname, optval,
1362 err = put_user(len, optlen);
1368 EXPORT_SYMBOL(ip_getsockopt);
1370 #ifdef CONFIG_COMPAT
1371 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1372 char __user *optval, int __user *optlen)
1376 if (optname == MCAST_MSFILTER)
1377 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1380 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1383 #ifdef CONFIG_NETFILTER
1384 /* we need to exclude all possible ENOPROTOOPTs except default case */
1385 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1386 !ip_mroute_opt(optname)) {
1389 if (get_user(len, optlen))
1393 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1396 err = put_user(len, optlen);
1402 EXPORT_SYMBOL(compat_ip_getsockopt);