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;
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);
193 int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
196 struct cmsghdr *cmsg;
198 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
199 if (!CMSG_OK(msg, cmsg))
201 if (cmsg->cmsg_level != SOL_IP)
203 switch (cmsg->cmsg_type) {
205 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
206 err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
212 struct in_pktinfo *info;
213 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
215 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
216 ipc->oif = info->ipi_ifindex;
217 ipc->addr = info->ipi_spec_dst.s_addr;
228 /* Special input handler for packets caught by router alert option.
229 They are selected only by protocol field, and then processed likely
230 local ones; but only if someone wants them! Otherwise, router
231 not running rsvpd will kill RSVP.
233 It is user level problem, what it will make with them.
234 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
235 but receiver should be enough clever f.e. to forward mtrace requests,
236 sent to multicast group to reach destination designated router.
238 struct ip_ra_chain *ip_ra_chain;
239 DEFINE_RWLOCK(ip_ra_lock);
241 int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
243 struct ip_ra_chain *ra, *new_ra, **rap;
245 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
248 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
250 write_lock_bh(&ip_ra_lock);
251 for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
254 write_unlock_bh(&ip_ra_lock);
259 write_unlock_bh(&ip_ra_lock);
268 if (new_ra == NULL) {
269 write_unlock_bh(&ip_ra_lock);
273 new_ra->destructor = destructor;
278 write_unlock_bh(&ip_ra_lock);
283 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
284 __be16 port, u32 info, u8 *payload)
286 struct inet_sock *inet = inet_sk(sk);
287 struct sock_exterr_skb *serr;
292 skb = skb_clone(skb, GFP_ATOMIC);
296 serr = SKB_EXT_ERR(skb);
297 serr->ee.ee_errno = err;
298 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
299 serr->ee.ee_type = icmp_hdr(skb)->type;
300 serr->ee.ee_code = icmp_hdr(skb)->code;
302 serr->ee.ee_info = info;
303 serr->ee.ee_data = 0;
304 serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
305 skb_network_header(skb);
308 if (skb_pull(skb, payload - skb->data) != NULL) {
309 skb_reset_transport_header(skb);
310 if (sock_queue_err_skb(sk, skb) == 0)
316 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
318 struct inet_sock *inet = inet_sk(sk);
319 struct sock_exterr_skb *serr;
326 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
330 skb_put(skb, sizeof(struct iphdr));
331 skb_reset_network_header(skb);
335 serr = SKB_EXT_ERR(skb);
336 serr->ee.ee_errno = err;
337 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
338 serr->ee.ee_type = 0;
339 serr->ee.ee_code = 0;
341 serr->ee.ee_info = info;
342 serr->ee.ee_data = 0;
343 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
346 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
347 skb_reset_transport_header(skb);
349 if (sock_queue_err_skb(sk, skb))
354 * Handle MSG_ERRQUEUE
356 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
358 struct sock_exterr_skb *serr;
359 struct sk_buff *skb, *skb2;
360 struct sockaddr_in *sin;
362 struct sock_extended_err ee;
363 struct sockaddr_in offender;
369 skb = skb_dequeue(&sk->sk_error_queue);
375 msg->msg_flags |= MSG_TRUNC;
378 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
382 sock_recv_timestamp(msg, sk, skb);
384 serr = SKB_EXT_ERR(skb);
386 sin = (struct sockaddr_in *)msg->msg_name;
388 sin->sin_family = AF_INET;
389 sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
391 sin->sin_port = serr->port;
392 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
395 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
396 sin = &errhdr.offender;
397 sin->sin_family = AF_UNSPEC;
398 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
399 struct inet_sock *inet = inet_sk(sk);
401 sin->sin_family = AF_INET;
402 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
404 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
405 if (inet->cmsg_flags)
406 ip_cmsg_recv(msg, skb);
409 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
411 /* Now we could try to dump offended packet options */
413 msg->msg_flags |= MSG_ERRQUEUE;
416 /* Reset and regenerate socket error */
417 spin_lock_bh(&sk->sk_error_queue.lock);
419 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
420 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
421 spin_unlock_bh(&sk->sk_error_queue.lock);
422 sk->sk_error_report(sk);
424 spin_unlock_bh(&sk->sk_error_queue.lock);
434 * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
438 static int do_ip_setsockopt(struct sock *sk, int level,
439 int optname, char __user *optval, int optlen)
441 struct inet_sock *inet = inet_sk(sk);
444 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
445 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
446 (1<<IP_RETOPTS) | (1<<IP_TOS) |
447 (1<<IP_TTL) | (1<<IP_HDRINCL) |
448 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
449 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
450 (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT))) ||
451 optname == IP_MULTICAST_TTL ||
452 optname == IP_MULTICAST_LOOP ||
453 optname == IP_RECVORIGDSTADDR) {
454 if (optlen >= sizeof(int)) {
455 if (get_user(val, (int __user *) optval))
457 } else if (optlen >= sizeof(char)) {
460 if (get_user(ucval, (unsigned char __user *) optval))
466 /* If optlen==0, it is equivalent to val == 0 */
468 if (ip_mroute_opt(optname))
469 return ip_mroute_setsockopt(sk, optname, optval, optlen);
477 struct ip_options * opt = NULL;
478 if (optlen > 40 || optlen < 0)
480 err = ip_options_get_from_user(sock_net(sk), &opt,
485 struct inet_connection_sock *icsk = inet_csk(sk);
486 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
487 if (sk->sk_family == PF_INET ||
488 (!((1 << sk->sk_state) &
489 (TCPF_LISTEN | TCPF_CLOSE)) &&
490 inet->daddr != LOOPBACK4_IPV6)) {
493 icsk->icsk_ext_hdr_len -= inet->opt->optlen;
495 icsk->icsk_ext_hdr_len += opt->optlen;
496 icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
497 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
501 opt = xchg(&inet->opt, opt);
507 inet->cmsg_flags |= IP_CMSG_PKTINFO;
509 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
513 inet->cmsg_flags |= IP_CMSG_TTL;
515 inet->cmsg_flags &= ~IP_CMSG_TTL;
519 inet->cmsg_flags |= IP_CMSG_TOS;
521 inet->cmsg_flags &= ~IP_CMSG_TOS;
525 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
527 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
531 inet->cmsg_flags |= IP_CMSG_RETOPTS;
533 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
537 inet->cmsg_flags |= IP_CMSG_PASSSEC;
539 inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
541 case IP_RECVORIGDSTADDR:
543 inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
545 inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
547 case IP_TOS: /* This sets both TOS and Precedence */
548 if (sk->sk_type == SOCK_STREAM) {
550 val |= inet->tos & 3;
552 if (inet->tos != val) {
554 sk->sk_priority = rt_tos2priority(val);
561 if (val != -1 && (val < 1 || val>255))
566 if (sk->sk_type != SOCK_RAW) {
570 inet->hdrincl = val ? 1 : 0;
572 case IP_MTU_DISCOVER:
575 inet->pmtudisc = val;
578 inet->recverr = !!val;
580 skb_queue_purge(&sk->sk_error_queue);
582 case IP_MULTICAST_TTL:
583 if (sk->sk_type == SOCK_STREAM)
589 if (val < 0 || val > 255)
593 case IP_MULTICAST_LOOP:
596 inet->mc_loop = !!val;
598 case IP_MULTICAST_IF:
600 struct ip_mreqn mreq;
601 struct net_device *dev = NULL;
603 if (sk->sk_type == SOCK_STREAM)
606 * Check the arguments are allowable
610 if (optlen >= sizeof(struct ip_mreqn)) {
611 if (copy_from_user(&mreq, optval, sizeof(mreq)))
614 memset(&mreq, 0, sizeof(mreq));
615 if (optlen >= sizeof(struct in_addr) &&
616 copy_from_user(&mreq.imr_address, optval, sizeof(struct in_addr)))
620 if (!mreq.imr_ifindex) {
621 if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
627 dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
629 mreq.imr_ifindex = dev->ifindex;
633 dev = __dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
636 err = -EADDRNOTAVAIL;
641 if (sk->sk_bound_dev_if &&
642 mreq.imr_ifindex != sk->sk_bound_dev_if)
645 inet->mc_index = mreq.imr_ifindex;
646 inet->mc_addr = mreq.imr_address.s_addr;
651 case IP_ADD_MEMBERSHIP:
652 case IP_DROP_MEMBERSHIP:
654 struct ip_mreqn mreq;
657 if (inet_sk(sk)->is_icsk)
660 if (optlen < sizeof(struct ip_mreq))
663 if (optlen >= sizeof(struct ip_mreqn)) {
664 if (copy_from_user(&mreq, optval, sizeof(mreq)))
667 memset(&mreq, 0, sizeof(mreq));
668 if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
672 if (optname == IP_ADD_MEMBERSHIP)
673 err = ip_mc_join_group(sk, &mreq);
675 err = ip_mc_leave_group(sk, &mreq);
680 extern int sysctl_igmp_max_msf;
681 struct ip_msfilter *msf;
683 if (optlen < IP_MSFILTER_SIZE(0))
685 if (optlen > sysctl_optmem_max) {
689 msf = kmalloc(optlen, GFP_KERNEL);
695 if (copy_from_user(msf, optval, optlen)) {
699 /* numsrc >= (1G-4) overflow in 32 bits */
700 if (msf->imsf_numsrc >= 0x3ffffffcU ||
701 msf->imsf_numsrc > sysctl_igmp_max_msf) {
706 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
711 err = ip_mc_msfilter(sk, msf, 0);
715 case IP_BLOCK_SOURCE:
716 case IP_UNBLOCK_SOURCE:
717 case IP_ADD_SOURCE_MEMBERSHIP:
718 case IP_DROP_SOURCE_MEMBERSHIP:
720 struct ip_mreq_source mreqs;
723 if (optlen != sizeof(struct ip_mreq_source))
725 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
729 if (optname == IP_BLOCK_SOURCE) {
730 omode = MCAST_EXCLUDE;
732 } else if (optname == IP_UNBLOCK_SOURCE) {
733 omode = MCAST_EXCLUDE;
735 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
736 struct ip_mreqn mreq;
738 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
739 mreq.imr_address.s_addr = mreqs.imr_interface;
740 mreq.imr_ifindex = 0;
741 err = ip_mc_join_group(sk, &mreq);
742 if (err && err != -EADDRINUSE)
744 omode = MCAST_INCLUDE;
746 } else /* IP_DROP_SOURCE_MEMBERSHIP */ {
747 omode = MCAST_INCLUDE;
750 err = ip_mc_source(add, omode, sk, &mreqs, 0);
753 case MCAST_JOIN_GROUP:
754 case MCAST_LEAVE_GROUP:
756 struct group_req greq;
757 struct sockaddr_in *psin;
758 struct ip_mreqn mreq;
760 if (optlen < sizeof(struct group_req))
763 if (copy_from_user(&greq, optval, sizeof(greq)))
765 psin = (struct sockaddr_in *)&greq.gr_group;
766 if (psin->sin_family != AF_INET)
768 memset(&mreq, 0, sizeof(mreq));
769 mreq.imr_multiaddr = psin->sin_addr;
770 mreq.imr_ifindex = greq.gr_interface;
772 if (optname == MCAST_JOIN_GROUP)
773 err = ip_mc_join_group(sk, &mreq);
775 err = ip_mc_leave_group(sk, &mreq);
778 case MCAST_JOIN_SOURCE_GROUP:
779 case MCAST_LEAVE_SOURCE_GROUP:
780 case MCAST_BLOCK_SOURCE:
781 case MCAST_UNBLOCK_SOURCE:
783 struct group_source_req greqs;
784 struct ip_mreq_source mreqs;
785 struct sockaddr_in *psin;
788 if (optlen != sizeof(struct group_source_req))
790 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
794 if (greqs.gsr_group.ss_family != AF_INET ||
795 greqs.gsr_source.ss_family != AF_INET) {
796 err = -EADDRNOTAVAIL;
799 psin = (struct sockaddr_in *)&greqs.gsr_group;
800 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
801 psin = (struct sockaddr_in *)&greqs.gsr_source;
802 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
803 mreqs.imr_interface = 0; /* use index for mc_source */
805 if (optname == MCAST_BLOCK_SOURCE) {
806 omode = MCAST_EXCLUDE;
808 } else if (optname == MCAST_UNBLOCK_SOURCE) {
809 omode = MCAST_EXCLUDE;
811 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
812 struct ip_mreqn mreq;
814 psin = (struct sockaddr_in *)&greqs.gsr_group;
815 mreq.imr_multiaddr = psin->sin_addr;
816 mreq.imr_address.s_addr = 0;
817 mreq.imr_ifindex = greqs.gsr_interface;
818 err = ip_mc_join_group(sk, &mreq);
819 if (err && err != -EADDRINUSE)
821 greqs.gsr_interface = mreq.imr_ifindex;
822 omode = MCAST_INCLUDE;
824 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
825 omode = MCAST_INCLUDE;
828 err = ip_mc_source(add, omode, sk, &mreqs,
829 greqs.gsr_interface);
834 extern int sysctl_igmp_max_msf;
835 struct sockaddr_in *psin;
836 struct ip_msfilter *msf = NULL;
837 struct group_filter *gsf = NULL;
838 int msize, i, ifindex;
840 if (optlen < GROUP_FILTER_SIZE(0))
842 if (optlen > sysctl_optmem_max) {
846 gsf = kmalloc(optlen, GFP_KERNEL);
852 if (copy_from_user(gsf, optval, optlen)) {
855 /* numsrc >= (4G-140)/128 overflow in 32 bits */
856 if (gsf->gf_numsrc >= 0x1ffffff ||
857 gsf->gf_numsrc > sysctl_igmp_max_msf) {
861 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
865 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
866 msf = kmalloc(msize, GFP_KERNEL);
871 ifindex = gsf->gf_interface;
872 psin = (struct sockaddr_in *)&gsf->gf_group;
873 if (psin->sin_family != AF_INET) {
874 err = -EADDRNOTAVAIL;
877 msf->imsf_multiaddr = psin->sin_addr.s_addr;
878 msf->imsf_interface = 0;
879 msf->imsf_fmode = gsf->gf_fmode;
880 msf->imsf_numsrc = gsf->gf_numsrc;
881 err = -EADDRNOTAVAIL;
882 for (i=0; i<gsf->gf_numsrc; ++i) {
883 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
885 if (psin->sin_family != AF_INET)
887 msf->imsf_slist[i] = psin->sin_addr.s_addr;
892 err = ip_mc_msfilter(sk, msf, ifindex);
898 case IP_ROUTER_ALERT:
899 err = ip_ra_control(sk, val ? 1 : 0, NULL);
905 inet->freebind = !!val;
908 case IP_IPSEC_POLICY:
911 if (!capable(CAP_NET_ADMIN))
913 err = xfrm_user_policy(sk, optname, optval, optlen);
917 if (!capable(CAP_NET_ADMIN)) {
923 inet->transparent = !!val;
938 int ip_setsockopt(struct sock *sk, int level,
939 int optname, char __user *optval, int optlen)
946 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
947 #ifdef CONFIG_NETFILTER
948 /* we need to exclude all possible ENOPROTOOPTs except default case */
949 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
950 optname != IP_IPSEC_POLICY &&
951 optname != IP_XFRM_POLICY &&
952 !ip_mroute_opt(optname)) {
954 err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
962 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
963 char __user *optval, int optlen)
970 if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
971 return compat_mc_setsockopt(sk, level, optname, optval, optlen,
974 err = do_ip_setsockopt(sk, level, optname, optval, optlen);
975 #ifdef CONFIG_NETFILTER
976 /* we need to exclude all possible ENOPROTOOPTs except default case */
977 if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
978 optname != IP_IPSEC_POLICY &&
979 optname != IP_XFRM_POLICY &&
980 !ip_mroute_opt(optname)) {
982 err = compat_nf_setsockopt(sk, PF_INET, optname,
990 EXPORT_SYMBOL(compat_ip_setsockopt);
994 * Get the options. Note for future reference. The GET of IP options gets the
995 * _received_ ones. The set sets the _sent_ ones.
998 static int do_ip_getsockopt(struct sock *sk, int level, int optname,
999 char __user *optval, int __user *optlen)
1001 struct inet_sock *inet = inet_sk(sk);
1005 if (level != SOL_IP)
1008 if (ip_mroute_opt(optname))
1009 return ip_mroute_getsockopt(sk, optname, optval, optlen);
1011 if (get_user(len, optlen))
1021 unsigned char optbuf[sizeof(struct ip_options)+40];
1022 struct ip_options * opt = (struct ip_options *)optbuf;
1025 memcpy(optbuf, inet->opt,
1026 sizeof(struct ip_options)+
1030 if (opt->optlen == 0)
1031 return put_user(0, optlen);
1033 ip_options_undo(opt);
1035 len = min_t(unsigned int, len, opt->optlen);
1036 if (put_user(len, optlen))
1038 if (copy_to_user(optval, opt->__data, len))
1043 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
1046 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
1049 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
1052 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
1055 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
1058 val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
1060 case IP_RECVORIGDSTADDR:
1061 val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
1067 val = (inet->uc_ttl == -1 ?
1068 sysctl_ip_default_ttl :
1072 val = inet->hdrincl;
1074 case IP_MTU_DISCOVER:
1075 val = inet->pmtudisc;
1079 struct dst_entry *dst;
1081 dst = sk_dst_get(sk);
1093 val = inet->recverr;
1095 case IP_MULTICAST_TTL:
1098 case IP_MULTICAST_LOOP:
1099 val = inet->mc_loop;
1101 case IP_MULTICAST_IF:
1103 struct in_addr addr;
1104 len = min_t(unsigned int, len, sizeof(struct in_addr));
1105 addr.s_addr = inet->mc_addr;
1108 if (put_user(len, optlen))
1110 if (copy_to_user(optval, &addr, len))
1116 struct ip_msfilter msf;
1119 if (len < IP_MSFILTER_SIZE(0)) {
1123 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1127 err = ip_mc_msfget(sk, &msf,
1128 (struct ip_msfilter __user *)optval, optlen);
1132 case MCAST_MSFILTER:
1134 struct group_filter gsf;
1137 if (len < GROUP_FILTER_SIZE(0)) {
1141 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1145 err = ip_mc_gsfget(sk, &gsf,
1146 (struct group_filter __user *)optval, optlen);
1156 if (sk->sk_type != SOCK_STREAM)
1157 return -ENOPROTOOPT;
1159 msg.msg_control = optval;
1160 msg.msg_controllen = len;
1163 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1164 struct in_pktinfo info;
1166 info.ipi_addr.s_addr = inet->rcv_saddr;
1167 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1168 info.ipi_ifindex = inet->mc_index;
1169 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1171 if (inet->cmsg_flags & IP_CMSG_TTL) {
1172 int hlim = inet->mc_ttl;
1173 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1175 len -= msg.msg_controllen;
1176 return put_user(len, optlen);
1179 val = inet->freebind;
1181 case IP_TRANSPARENT:
1182 val = inet->transparent;
1186 return -ENOPROTOOPT;
1190 if (len < sizeof(int) && len > 0 && val>=0 && val<=255) {
1191 unsigned char ucval = (unsigned char)val;
1193 if (put_user(len, optlen))
1195 if (copy_to_user(optval, &ucval, 1))
1198 len = min_t(unsigned int, sizeof(int), len);
1199 if (put_user(len, optlen))
1201 if (copy_to_user(optval, &val, len))
1207 int ip_getsockopt(struct sock *sk, int level,
1208 int optname, char __user *optval, int __user *optlen)
1212 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1213 #ifdef CONFIG_NETFILTER
1214 /* we need to exclude all possible ENOPROTOOPTs except default case */
1215 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1216 !ip_mroute_opt(optname)) {
1219 if (get_user(len, optlen))
1223 err = nf_getsockopt(sk, PF_INET, optname, optval,
1227 err = put_user(len, optlen);
1234 #ifdef CONFIG_COMPAT
1235 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
1236 char __user *optval, int __user *optlen)
1240 if (optname == MCAST_MSFILTER)
1241 return compat_mc_getsockopt(sk, level, optname, optval, optlen,
1244 err = do_ip_getsockopt(sk, level, optname, optval, optlen);
1246 #ifdef CONFIG_NETFILTER
1247 /* we need to exclude all possible ENOPROTOOPTs except default case */
1248 if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
1249 !ip_mroute_opt(optname)) {
1252 if (get_user(len, optlen))
1256 err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
1259 err = put_user(len, optlen);
1266 EXPORT_SYMBOL(compat_ip_getsockopt);
1269 EXPORT_SYMBOL(ip_cmsg_recv);
1271 EXPORT_SYMBOL(ip_getsockopt);
1272 EXPORT_SYMBOL(ip_setsockopt);