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.
60 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
62 struct in_pktinfo info = *PKTINFO_SKB_CB(skb);
64 info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
66 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
69 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
71 int ttl = ip_hdr(skb)->ttl;
72 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
75 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
77 put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
80 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
82 if (IPCB(skb)->opt.optlen == 0)
85 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
90 static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
92 unsigned char optbuf[sizeof(struct ip_options) + 40];
93 struct ip_options *opt = (struct ip_options *)optbuf;
95 if (IPCB(skb)->opt.optlen == 0)
98 if (ip_options_echo(opt, skb)) {
99 msg->msg_flags |= MSG_CTRUNC;
102 ip_options_undo(opt);
104 put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
107 static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
113 err = security_socket_getpeersec_dgram(NULL, skb, &secid);
117 err = security_secid_to_secctx(secid, &secdata, &seclen);
121 put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
122 security_release_secctx(secdata, seclen);
125 static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
127 struct sockaddr_in sin;
128 const struct iphdr *iph = ip_hdr(skb);
129 __be16 *ports = (__be16 *)skb_transport_header(skb);
131 if (skb_transport_offset(skb) + 4 > skb->len)
134 /* All current transport protocols have the port numbers in the
135 * first four bytes of the transport header and this function is
136 * written with this assumption in mind.
139 sin.sin_family = AF_INET;
140 sin.sin_addr.s_addr = iph->daddr;
141 sin.sin_port = ports[1];
142 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
144 put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
147 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
149 struct inet_sock *inet = inet_sk(skb->sk);
150 unsigned int flags = inet->cmsg_flags;
152 /* Ordered by supposed usage frequency */
154 ip_cmsg_recv_pktinfo(msg, skb);
155 if ((flags >>= 1) == 0)
159 ip_cmsg_recv_ttl(msg, skb);
160 if ((flags >>= 1) == 0)
164 ip_cmsg_recv_tos(msg, skb);
165 if ((flags >>= 1) == 0)
169 ip_cmsg_recv_opts(msg, skb);
170 if ((flags >>= 1) == 0)
174 ip_cmsg_recv_retopts(msg, skb);
175 if ((flags >>= 1) == 0)
179 ip_cmsg_recv_security(msg, skb);
181 if ((flags >>= 1) == 0)
184 ip_cmsg_recv_dstaddr(msg, skb);
187 EXPORT_SYMBOL(ip_cmsg_recv);
189 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc,
193 struct cmsghdr *cmsg;
195 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
196 if (!CMSG_OK(msg, cmsg))
198 #if defined(CONFIG_IPV6)
200 cmsg->cmsg_level == SOL_IPV6 &&
201 cmsg->cmsg_type == IPV6_PKTINFO) {
202 struct in6_pktinfo *src_info;
204 if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
206 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
207 if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
209 ipc->oif = src_info->ipi6_ifindex;
210 ipc->addr = src_info->ipi6_addr.s6_addr32[3];
214 if (cmsg->cmsg_level != SOL_IP)
216 switch (cmsg->cmsg_type) {
218 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
219 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg),
220 err < 40 ? err : 40);
226 struct in_pktinfo *info;
227 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
229 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
230 ipc->oif = info->ipi_ifindex;
231 ipc->addr = info->ipi_spec_dst.s_addr;
235 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
237 val = *(int *)CMSG_DATA(cmsg);
238 if (val < 1 || val > 255)
243 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
245 val = *(int *)CMSG_DATA(cmsg);
246 if (val < 0 || val > 255)
249 ipc->priority = rt_tos2priority(ipc->tos);
260 /* Special input handler for packets caught by router alert option.
261 They are selected only by protocol field, and then processed likely
262 local ones; but only if someone wants them! Otherwise, router
263 not running rsvpd will kill RSVP.
265 It is user level problem, what it will make with them.
266 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
267 but receiver should be enough clever f.e. to forward mtrace requests,
268 sent to multicast group to reach destination designated router.
270 struct ip_ra_chain __rcu *ip_ra_chain;
271 static DEFINE_SPINLOCK(ip_ra_lock);
274 static void ip_ra_destroy_rcu(struct rcu_head *head)
276 struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
278 sock_put(ra->saved_sk);
282 int ip_ra_control(struct sock *sk, unsigned char on,
283 void (*destructor)(struct sock *))
285 struct ip_ra_chain *ra, *new_ra;
286 struct ip_ra_chain __rcu **rap;
288 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
291 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
293 spin_lock_bh(&ip_ra_lock);
294 for (rap = &ip_ra_chain;
295 (ra = rcu_dereference_protected(*rap,
296 lockdep_is_held(&ip_ra_lock))) != NULL;
300 spin_unlock_bh(&ip_ra_lock);
304 /* dont let ip_call_ra_chain() use sk again */
306 rcu_assign_pointer(*rap, ra->next);
307 spin_unlock_bh(&ip_ra_lock);
312 * Delay sock_put(sk) and kfree(ra) after one rcu grace
313 * period. This guarantee ip_call_ra_chain() dont need
314 * to mess with socket refcounts.
317 call_rcu(&ra->rcu, ip_ra_destroy_rcu);
321 if (new_ra == NULL) {
322 spin_unlock_bh(&ip_ra_lock);
326 new_ra->destructor = destructor;
329 rcu_assign_pointer(*rap, new_ra);
331 spin_unlock_bh(&ip_ra_lock);
336 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
337 __be16 port, u32 info, u8 *payload)
339 struct sock_exterr_skb *serr;
341 skb = skb_clone(skb, GFP_ATOMIC);
345 serr = SKB_EXT_ERR(skb);
346 serr->ee.ee_errno = err;
347 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
348 serr->ee.ee_type = icmp_hdr(skb)->type;
349 serr->ee.ee_code = icmp_hdr(skb)->code;
351 serr->ee.ee_info = info;
352 serr->ee.ee_data = 0;
353 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
354 skb_network_header(skb);
357 if (skb_pull(skb, payload - skb->data) != NULL) {
358 skb_reset_transport_header(skb);
359 if (sock_queue_err_skb(sk, skb) == 0)
365 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
367 struct inet_sock *inet = inet_sk(sk);
368 struct sock_exterr_skb *serr;
375 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
379 skb_put(skb, sizeof(struct iphdr));
380 skb_reset_network_header(skb);
384 serr = SKB_EXT_ERR(skb);
385 serr->ee.ee_errno = err;
386 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
387 serr->ee.ee_type = 0;
388 serr->ee.ee_code = 0;
390 serr->ee.ee_info = info;
391 serr->ee.ee_data = 0;
392 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
395 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
396 skb_reset_transport_header(skb);
398 if (sock_queue_err_skb(sk, skb))
403 * Handle MSG_ERRQUEUE
405 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
407 struct sock_exterr_skb *serr;
408 struct sk_buff *skb, *skb2;
409 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
411 struct sock_extended_err ee;
412 struct sockaddr_in offender;
418 skb = skb_dequeue(&sk->sk_error_queue);
424 msg->msg_flags |= MSG_TRUNC;
427 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
431 sock_recv_timestamp(msg, sk, skb);
433 serr = SKB_EXT_ERR(skb);
436 sin->sin_family = AF_INET;
437 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
439 sin->sin_port = serr->port;
440 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
441 *addr_len = sizeof(*sin);
444 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
445 sin = &errhdr.offender;
446 sin->sin_family = AF_UNSPEC;
447 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
448 struct inet_sock *inet = inet_sk(sk);
450 sin->sin_family = AF_INET;
451 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
453 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
454 if (inet->cmsg_flags)
455 ip_cmsg_recv(msg, skb);
458 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
460 /* Now we could try to dump offended packet options */
462 msg->msg_flags |= MSG_ERRQUEUE;
465 /* Reset and regenerate socket error */
466 spin_lock_bh(&sk->sk_error_queue.lock);
468 skb2 = skb_peek(&sk->sk_error_queue);
470 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
471 spin_unlock_bh(&sk->sk_error_queue.lock);
472 sk->sk_error_report(sk);
474 spin_unlock_bh(&sk->sk_error_queue.lock);
484 * Socket option code for IP. This is the end of the line after any
485 * TCP,UDP etc options on an IP socket.
488 static int do_ip_setsockopt(struct sock *sk, int level,
489 int optname, char __user *optval, unsigned int optlen)
491 struct inet_sock *inet = inet_sk(sk);
503 case IP_MTU_DISCOVER:
505 case IP_ROUTER_ALERT:
512 case IP_MULTICAST_TTL:
513 case IP_MULTICAST_ALL:
514 case IP_MULTICAST_LOOP:
515 case IP_RECVORIGDSTADDR:
516 if (optlen >= sizeof(int)) {
517 if (get_user(val, (int __user *) optval))
519 } else if (optlen >= sizeof(char)) {
522 if (get_user(ucval, (unsigned char __user *) optval))
528 /* If optlen==0, it is equivalent to val == 0 */
530 if (ip_mroute_opt(optname))
531 return ip_mroute_setsockopt(sk, optname, optval, optlen);
539 struct ip_options_rcu *old, *opt = NULL;
543 err = ip_options_get_from_user(sock_net(sk), &opt,
547 old = rcu_dereference_protected(inet->inet_opt,
548 sock_owned_by_user(sk));
550 struct inet_connection_sock *icsk = inet_csk(sk);
551 #if IS_ENABLED(CONFIG_IPV6)
552 if (sk->sk_family == PF_INET ||
553 (!((1 << sk->sk_state) &
554 (TCPF_LISTEN | TCPF_CLOSE)) &&
555 inet->inet_daddr != LOOPBACK4_IPV6)) {
558 icsk->icsk_ext_hdr_len -= old->opt.optlen;
560 icsk->icsk_ext_hdr_len += opt->opt.optlen;
561 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
562 #if IS_ENABLED(CONFIG_IPV6)
566 rcu_assign_pointer(inet->inet_opt, opt);
573 inet->cmsg_flags |= IP_CMSG_PKTINFO;
575 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
579 inet->cmsg_flags |= IP_CMSG_TTL;
581 inet->cmsg_flags &= ~IP_CMSG_TTL;
585 inet->cmsg_flags |= IP_CMSG_TOS;
587 inet->cmsg_flags &= ~IP_CMSG_TOS;
591 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
593 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
597 inet->cmsg_flags |= IP_CMSG_RETOPTS;
599 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
603 inet->cmsg_flags |= IP_CMSG_PASSSEC;
605 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
607 case IP_RECVORIGDSTADDR:
609 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
611 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
613 case IP_TOS: /* This sets both TOS and Precedence */
614 if (sk->sk_type == SOCK_STREAM) {
615 val &= ~INET_ECN_MASK;
616 val |= inet->tos & INET_ECN_MASK;
618 if (inet->tos != val) {
620 sk->sk_priority = rt_tos2priority(val);
627 if (val != -1 && (val < 1 || val > 255))
632 if (sk->sk_type != SOCK_RAW) {
636 inet->hdrincl = val ? 1 : 0;
639 if (sk->sk_type != SOCK_RAW) {
643 inet->nodefrag = val ? 1 : 0;
645 case IP_MTU_DISCOVER:
646 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
648 inet->pmtudisc = val;
651 inet->recverr = !!val;
653 skb_queue_purge(&sk->sk_error_queue);
655 case IP_MULTICAST_TTL:
656 if (sk->sk_type == SOCK_STREAM)
662 if (val < 0 || val > 255)
666 case IP_MULTICAST_LOOP:
669 inet->mc_loop = !!val;
673 struct net_device *dev = NULL;
676 if (optlen != sizeof(int))
679 ifindex = (__force int)ntohl((__force __be32)val);
686 dev = dev_get_by_index(sock_net(sk), ifindex);
687 err = -EADDRNOTAVAIL;
693 if (sk->sk_bound_dev_if)
696 inet->uc_index = ifindex;
700 case IP_MULTICAST_IF:
702 struct ip_mreqn mreq;
703 struct net_device *dev = NULL;
705 if (sk->sk_type == SOCK_STREAM)
708 * Check the arguments are allowable
711 if (optlen < sizeof(struct in_addr))
715 if (optlen >= sizeof(struct ip_mreqn)) {
716 if (copy_from_user(&mreq, optval, sizeof(mreq)))
719 memset(&mreq, 0, sizeof(mreq));
720 if (optlen >= sizeof(struct ip_mreq)) {
721 if (copy_from_user(&mreq, optval,
722 sizeof(struct ip_mreq)))
724 } else if (optlen >= sizeof(struct in_addr)) {
725 if (copy_from_user(&mreq.imr_address, optval,
726 sizeof(struct in_addr)))
731 if (!mreq.imr_ifindex) {
732 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
738 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
740 mreq.imr_ifindex = dev->ifindex;
742 dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
745 err = -EADDRNOTAVAIL;
751 if (sk->sk_bound_dev_if &&
752 mreq.imr_ifindex != sk->sk_bound_dev_if)
755 inet->mc_index = mreq.imr_ifindex;
756 inet->mc_addr = mreq.imr_address.s_addr;
761 case IP_ADD_MEMBERSHIP:
762 case IP_DROP_MEMBERSHIP:
764 struct ip_mreqn mreq;
767 if (inet_sk(sk)->is_icsk)
770 if (optlen < sizeof(struct ip_mreq))
773 if (optlen >= sizeof(struct ip_mreqn)) {
774 if (copy_from_user(&mreq, optval, sizeof(mreq)))
777 memset(&mreq, 0, sizeof(mreq));
778 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
782 if (optname == IP_ADD_MEMBERSHIP)
783 err = ip_mc_join_group(sk, &mreq);
785 err = ip_mc_leave_group(sk, &mreq);
790 struct ip_msfilter *msf;
792 if (optlen < IP_MSFILTER_SIZE(0))
794 if (optlen > sysctl_optmem_max) {
798 msf = kmalloc(optlen, GFP_KERNEL);
804 if (copy_from_user(msf, optval, optlen)) {
808 /* numsrc >= (1G-4) overflow in 32 bits */
809 if (msf->imsf_numsrc >= 0x3ffffffcU ||
810 msf->imsf_numsrc > sysctl_igmp_max_msf) {
815 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
820 err = ip_mc_msfilter(sk, msf, 0);
824 case IP_BLOCK_SOURCE:
825 case IP_UNBLOCK_SOURCE:
826 case IP_ADD_SOURCE_MEMBERSHIP:
827 case IP_DROP_SOURCE_MEMBERSHIP:
829 struct ip_mreq_source mreqs;
832 if (optlen != sizeof(struct ip_mreq_source))
834 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
838 if (optname == IP_BLOCK_SOURCE) {
839 omode = MCAST_EXCLUDE;
841 } else if (optname == IP_UNBLOCK_SOURCE) {
842 omode = MCAST_EXCLUDE;
844 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
845 struct ip_mreqn mreq;
847 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
848 mreq.imr_address.s_addr = mreqs.imr_interface;
849 mreq.imr_ifindex = 0;
850 err = ip_mc_join_group(sk, &mreq);
851 if (err && err != -EADDRINUSE)
853 omode = MCAST_INCLUDE;
855 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
856 omode = MCAST_INCLUDE;
859 err = ip_mc_source(add, omode, sk, &mreqs, 0);
862 case MCAST_JOIN_GROUP:
863 case MCAST_LEAVE_GROUP:
865 struct group_req greq;
866 struct sockaddr_in *psin;
867 struct ip_mreqn mreq;
869 if (optlen < sizeof(struct group_req))
872 if (copy_from_user(&greq, optval, sizeof(greq)))
874 psin = (struct sockaddr_in *)&greq.gr_group;
875 if (psin->sin_family != AF_INET)
877 memset(&mreq, 0, sizeof(mreq));
878 mreq.imr_multiaddr = psin->sin_addr;
879 mreq.imr_ifindex = greq.gr_interface;
881 if (optname == MCAST_JOIN_GROUP)
882 err = ip_mc_join_group(sk, &mreq);
884 err = ip_mc_leave_group(sk, &mreq);
887 case MCAST_JOIN_SOURCE_GROUP:
888 case MCAST_LEAVE_SOURCE_GROUP:
889 case MCAST_BLOCK_SOURCE:
890 case MCAST_UNBLOCK_SOURCE:
892 struct group_source_req greqs;
893 struct ip_mreq_source mreqs;
894 struct sockaddr_in *psin;
897 if (optlen != sizeof(struct group_source_req))
899 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
903 if (greqs.gsr_group.ss_family != AF_INET ||
904 greqs.gsr_source.ss_family != AF_INET) {
905 err = -EADDRNOTAVAIL;
908 psin = (struct sockaddr_in *)&greqs.gsr_group;
909 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
910 psin = (struct sockaddr_in *)&greqs.gsr_source;
911 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
912 mreqs.imr_interface = 0; /* use index for mc_source */
914 if (optname == MCAST_BLOCK_SOURCE) {
915 omode = MCAST_EXCLUDE;
917 } else if (optname == MCAST_UNBLOCK_SOURCE) {
918 omode = MCAST_EXCLUDE;
920 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
921 struct ip_mreqn mreq;
923 psin = (struct sockaddr_in *)&greqs.gsr_group;
924 mreq.imr_multiaddr = psin->sin_addr;
925 mreq.imr_address.s_addr = 0;
926 mreq.imr_ifindex = greqs.gsr_interface;
927 err = ip_mc_join_group(sk, &mreq);
928 if (err && err != -EADDRINUSE)
930 greqs.gsr_interface = mreq.imr_ifindex;
931 omode = MCAST_INCLUDE;
933 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
934 omode = MCAST_INCLUDE;
937 err = ip_mc_source(add, omode, sk, &mreqs,
938 greqs.gsr_interface);
943 struct sockaddr_in *psin;
944 struct ip_msfilter *msf = NULL;
945 struct group_filter *gsf = NULL;
946 int msize, i, ifindex;
948 if (optlen < GROUP_FILTER_SIZE(0))
950 if (optlen > sysctl_optmem_max) {
954 gsf = kmalloc(optlen, GFP_KERNEL);
960 if (copy_from_user(gsf, optval, optlen))
963 /* numsrc >= (4G-140)/128 overflow in 32 bits */
964 if (gsf->gf_numsrc >= 0x1ffffff ||
965 gsf->gf_numsrc > sysctl_igmp_max_msf) {
969 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
973 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
974 msf = kmalloc(msize, GFP_KERNEL);
979 ifindex = gsf->gf_interface;
980 psin = (struct sockaddr_in *)&gsf->gf_group;
981 if (psin->sin_family != AF_INET) {
982 err = -EADDRNOTAVAIL;
985 msf->imsf_multiaddr = psin->sin_addr.s_addr;
986 msf->imsf_interface = 0;
987 msf->imsf_fmode = gsf->gf_fmode;
988 msf->imsf_numsrc = gsf->gf_numsrc;
989 err = -EADDRNOTAVAIL;
990 for (i = 0; i < gsf->gf_numsrc; ++i) {
991 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
993 if (psin->sin_family != AF_INET)
995 msf->imsf_slist[i] = psin->sin_addr.s_addr;
1000 err = ip_mc_msfilter(sk, msf, ifindex);
1006 case IP_MULTICAST_ALL:
1009 if (val != 0 && val != 1)
1013 case IP_ROUTER_ALERT:
1014 err = ip_ra_control(sk, val ? 1 : 0, NULL);
1020 inet->freebind = !!val;
1023 case IP_IPSEC_POLICY:
1024 case IP_XFRM_POLICY:
1026 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
1028 err = xfrm_user_policy(sk, optname, optval, optlen);
1031 case IP_TRANSPARENT:
1032 if (!!val && !ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
1033 !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
1039 inet->transparent = !!val;
1045 if (val < 0 || val > 255)
1047 inet->min_ttl = val;
1063 * ipv4_pktinfo_prepare - transfert some info from rtable to skb
1067 * To support IP_CMSG_PKTINFO option, we store rt_iif and specific
1068 * destination in skb->cb[] before dst drop.
1069 * This way, receiver doesn't make cache line misses to read rtable.
1071 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
1073 struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
1074 bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
1077 if (prepare && skb_rtable(skb)) {
1078 pktinfo->ipi_ifindex = inet_iif(skb);
1079 pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
1081 pktinfo->ipi_ifindex = 0;
1082 pktinfo->ipi_spec_dst.s_addr = 0;
1087 int ip_setsockopt(struct sock *sk, int level,
1088 int optname, char __user *optval, unsigned int optlen)
1092 if (level != SOL_IP)
1093 return -ENOPROTOOPT;
1095 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1096 #ifdef CONFIG_NETFILTER
1097 /* we need to exclude all possible ENOPROTOOPTs except default case */
1098 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1099 optname != IP_IPSEC_POLICY &&
1100 optname != IP_XFRM_POLICY &&
1101 !ip_mroute_opt(optname)) {
1103 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
1109 EXPORT_SYMBOL(ip_setsockopt);
1111 #ifdef CONFIG_COMPAT
1112 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
1113 char __user *optval, unsigned int optlen)
1117 if (level != SOL_IP)
1118 return -ENOPROTOOPT;
1120 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
1121 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
1124 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
1125 #ifdef CONFIG_NETFILTER
1126 /* we need to exclude all possible ENOPROTOOPTs except default case */
1127 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
1128 optname != IP_IPSEC_POLICY &&
1129 optname != IP_XFRM_POLICY &&
1130 !ip_mroute_opt(optname)) {
1132 err = compat_nf_setsockopt(sk, PF_INET, optname,
1139 EXPORT_SYMBOL(compat_ip_setsockopt);
1143 * Get the options. Note for future reference. The GET of IP options gets
1144 * the _received_ ones. The set sets the _sent_ ones.
1147 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
1148 char __user *optval, int __user *optlen, unsigned int flags)
1150 struct inet_sock *inet = inet_sk(sk);
1154 if (level != SOL_IP)
1157 if (ip_mroute_opt(optname))
1158 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1160 if (get_user(len, optlen))
1170 unsigned char optbuf[sizeof(struct ip_options)+40];
1171 struct ip_options *opt = (struct ip_options *)optbuf;
1172 struct ip_options_rcu *inet_opt;
1174 inet_opt = rcu_dereference_protected(inet->inet_opt,
1175 sock_owned_by_user(sk));
1178 memcpy(optbuf, &inet_opt->opt,
1179 sizeof(struct ip_options) +
1180 inet_opt->opt.optlen);
1183 if (opt->optlen == 0)
1184 return put_user(0, optlen);
1186 ip_options_undo(opt);
1188 len = min_t(unsigned int, len, opt->optlen);
1189 if (put_user(len, optlen))
1191 if (copy_to_user(optval, opt->__data, len))
1196 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1199 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1202 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1205 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1208 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1211 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1213 case IP_RECVORIGDSTADDR:
1214 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1220 val = (inet->uc_ttl == -1 ?
1221 sysctl_ip_default_ttl :
1225 val = inet->hdrincl;
1228 val = inet->nodefrag;
1230 case IP_MTU_DISCOVER:
1231 val = inet->pmtudisc;
1235 struct dst_entry *dst;
1237 dst = sk_dst_get(sk);
1249 val = inet->recverr;
1251 case IP_MULTICAST_TTL:
1254 case IP_MULTICAST_LOOP:
1255 val = inet->mc_loop;
1258 val = (__force int)htonl((__u32) inet->uc_index);
1260 case IP_MULTICAST_IF:
1262 struct in_addr addr;
1263 len = min_t(unsigned int, len, sizeof(struct in_addr));
1264 addr.s_addr = inet->mc_addr;
1267 if (put_user(len, optlen))
1269 if (copy_to_user(optval, &addr, len))
1275 struct ip_msfilter msf;
1278 if (len < IP_MSFILTER_SIZE(0)) {
1282 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1286 err = ip_mc_msfget(sk, &msf,
1287 (struct ip_msfilter __user *)optval, optlen);
1291 case MCAST_MSFILTER:
1293 struct group_filter gsf;
1296 if (len < GROUP_FILTER_SIZE(0)) {
1300 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1304 err = ip_mc_gsfget(sk, &gsf,
1305 (struct group_filter __user *)optval,
1310 case IP_MULTICAST_ALL:
1319 if (sk->sk_type != SOCK_STREAM)
1320 return -ENOPROTOOPT;
1322 msg.msg_control = (__force void *) optval;
1323 msg.msg_controllen = len;
1324 msg.msg_flags = flags;
1326 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1327 struct in_pktinfo info;
1329 info.ipi_addr.s_addr = inet->inet_rcv_saddr;
1330 info.ipi_spec_dst.s_addr = inet->inet_rcv_saddr;
1331 info.ipi_ifindex = inet->mc_index;
1332 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1334 if (inet->cmsg_flags & IP_CMSG_TTL) {
1335 int hlim = inet->mc_ttl;
1336 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1338 if (inet->cmsg_flags & IP_CMSG_TOS) {
1339 int tos = inet->rcv_tos;
1340 put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
1342 len -= msg.msg_controllen;
1343 return put_user(len, optlen);
1346 val = inet->freebind;
1348 case IP_TRANSPARENT:
1349 val = inet->transparent;
1352 val = inet->min_ttl;
1356 return -ENOPROTOOPT;
1360 if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
1361 unsigned char ucval = (unsigned char)val;
1363 if (put_user(len, optlen))
1365 if (copy_to_user(optval, &ucval, 1))
1368 len = min_t(unsigned int, sizeof(int), len);
1369 if (put_user(len, optlen))
1371 if (copy_to_user(optval, &val, len))
1377 int ip_getsockopt(struct sock *sk, int level,
1378 int optname, char __user *optval, int __user *optlen)
1382 err = do_ip_getsockopt(sk, level, optname, optval, optlen, 0);
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 = nf_getsockopt(sk, PF_INET, optname, optval,
1397 err = put_user(len, optlen);
1403 EXPORT_SYMBOL(ip_getsockopt);
1405 #ifdef CONFIG_COMPAT
1406 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1407 char __user *optval, int __user *optlen)
1411 if (optname == MCAST_MSFILTER)
1412 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1415 err = do_ip_getsockopt(sk, level, optname, optval, optlen,
1418 #ifdef CONFIG_NETFILTER
1419 /* we need to exclude all possible ENOPROTOOPTs except default case */
1420 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1421 !ip_mroute_opt(optname)) {
1424 if (get_user(len, optlen))
1428 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1431 err = put_user(len, optlen);
1437 EXPORT_SYMBOL(compat_ip_getsockopt);