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.
8 * Version: $Id: ip_sockglue.c,v 1.62 2002/02/01 22:01:04 davem Exp $
13 * Many : Split from ip.c , see ip.c for history.
14 * Martin Mares : TOS setting fixed.
15 * Alan Cox : Fixed a couple of oopses in Martin's
17 * Mike McLagan : Routing by source
20 #include <linux/config.h>
21 #include <linux/module.h>
22 #include <linux/types.h>
24 #include <linux/sched.h>
25 #include <linux/skbuff.h>
27 #include <linux/icmp.h>
28 #include <linux/netdevice.h>
33 #include <linux/tcp.h>
34 #include <linux/udp.h>
35 #include <linux/igmp.h>
36 #include <linux/netfilter.h>
37 #include <linux/route.h>
38 #include <linux/mroute.h>
39 #include <net/route.h>
41 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
42 #include <net/transp_v6.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
55 * SOL_IP control messages.
58 static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
60 struct in_pktinfo info;
61 struct rtable *rt = (struct rtable *)skb->dst;
63 info.ipi_addr.s_addr = skb->nh.iph->daddr;
65 info.ipi_ifindex = rt->rt_iif;
66 info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
69 info.ipi_spec_dst.s_addr = 0;
72 put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
75 static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
77 int ttl = skb->nh.iph->ttl;
78 put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
81 static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
83 put_cmsg(msg, SOL_IP, IP_TOS, 1, &skb->nh.iph->tos);
86 static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
88 if (IPCB(skb)->opt.optlen == 0)
91 put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, skb->nh.iph+1);
95 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);
113 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
115 struct inet_opt *inet = inet_sk(skb->sk);
116 unsigned flags = inet->cmsg_flags;
118 /* Ordered by supposed usage frequency */
120 ip_cmsg_recv_pktinfo(msg, skb);
121 if ((flags>>=1) == 0)
125 ip_cmsg_recv_ttl(msg, skb);
126 if ((flags>>=1) == 0)
130 ip_cmsg_recv_tos(msg, skb);
131 if ((flags>>=1) == 0)
135 ip_cmsg_recv_opts(msg, skb);
136 if ((flags>>=1) == 0)
140 ip_cmsg_recv_retopts(msg, skb);
143 int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
146 struct cmsghdr *cmsg;
148 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
149 if (cmsg->cmsg_len < sizeof(struct cmsghdr) ||
150 (unsigned long)(((char*)cmsg - (char*)msg->msg_control)
151 + cmsg->cmsg_len) > msg->msg_controllen) {
154 if (cmsg->cmsg_level != SOL_IP)
156 switch (cmsg->cmsg_type) {
158 err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
159 err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40, 0);
165 struct in_pktinfo *info;
166 if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
168 info = (struct in_pktinfo *)CMSG_DATA(cmsg);
169 ipc->oif = info->ipi_ifindex;
170 ipc->addr = info->ipi_spec_dst.s_addr;
181 /* Special input handler for packets caught by router alert option.
182 They are selected only by protocol field, and then processed likely
183 local ones; but only if someone wants them! Otherwise, router
184 not running rsvpd will kill RSVP.
186 It is user level problem, what it will make with them.
187 I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
188 but receiver should be enough clever f.e. to forward mtrace requests,
189 sent to multicast group to reach destination designated router.
191 struct ip_ra_chain *ip_ra_chain;
192 rwlock_t ip_ra_lock = RW_LOCK_UNLOCKED;
194 int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
196 struct ip_ra_chain *ra, *new_ra, **rap;
198 if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
201 new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
203 write_lock_bh(&ip_ra_lock);
204 for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
207 write_unlock_bh(&ip_ra_lock);
213 write_unlock_bh(&ip_ra_lock);
222 if (new_ra == NULL) {
223 write_unlock_bh(&ip_ra_lock);
227 new_ra->destructor = destructor;
232 write_unlock_bh(&ip_ra_lock);
237 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
238 u16 port, u32 info, u8 *payload)
240 struct inet_opt *inet = inet_sk(sk);
241 struct sock_exterr_skb *serr;
246 skb = skb_clone(skb, GFP_ATOMIC);
250 serr = SKB_EXT_ERR(skb);
251 serr->ee.ee_errno = err;
252 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
253 serr->ee.ee_type = skb->h.icmph->type;
254 serr->ee.ee_code = skb->h.icmph->code;
256 serr->ee.ee_info = info;
257 serr->ee.ee_data = 0;
258 serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
261 skb->h.raw = payload;
262 if (!skb_pull(skb, payload - skb->data) ||
263 sock_queue_err_skb(sk, skb))
267 void ip_local_error(struct sock *sk, int err, u32 daddr, u16 port, u32 info)
269 struct inet_opt *inet = inet_sk(sk);
270 struct sock_exterr_skb *serr;
277 skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
281 iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
285 serr = SKB_EXT_ERR(skb);
286 serr->ee.ee_errno = err;
287 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
288 serr->ee.ee_type = 0;
289 serr->ee.ee_code = 0;
291 serr->ee.ee_info = info;
292 serr->ee.ee_data = 0;
293 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
296 skb->h.raw = skb->tail;
297 __skb_pull(skb, skb->tail - skb->data);
299 if (sock_queue_err_skb(sk, skb))
304 * Handle MSG_ERRQUEUE
306 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
308 struct sock_exterr_skb *serr;
309 struct sk_buff *skb, *skb2;
310 struct sockaddr_in *sin;
312 struct sock_extended_err ee;
313 struct sockaddr_in offender;
319 skb = skb_dequeue(&sk->sk_error_queue);
325 msg->msg_flags |= MSG_TRUNC;
328 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
332 sock_recv_timestamp(msg, sk, skb);
334 serr = SKB_EXT_ERR(skb);
336 sin = (struct sockaddr_in *)msg->msg_name;
338 sin->sin_family = AF_INET;
339 sin->sin_addr.s_addr = *(u32*)(skb->nh.raw + serr->addr_offset);
340 sin->sin_port = serr->port;
341 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
344 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
345 sin = &errhdr.offender;
346 sin->sin_family = AF_UNSPEC;
347 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
348 struct inet_opt *inet = inet_sk(sk);
350 sin->sin_family = AF_INET;
351 sin->sin_addr.s_addr = skb->nh.iph->saddr;
353 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
354 if (inet->cmsg_flags)
355 ip_cmsg_recv(msg, skb);
358 put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
360 /* Now we could try to dump offended packet options */
362 msg->msg_flags |= MSG_ERRQUEUE;
365 /* Reset and regenerate socket error */
366 spin_lock_irq(&sk->sk_error_queue.lock);
368 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
369 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
370 spin_unlock_irq(&sk->sk_error_queue.lock);
371 sk->sk_error_report(sk);
373 spin_unlock_irq(&sk->sk_error_queue.lock);
383 * Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
387 int ip_setsockopt(struct sock *sk, int level, int optname, char *optval, int optlen)
389 struct inet_opt *inet = inet_sk(sk);
395 if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
396 (1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
397 (1<<IP_RETOPTS) | (1<<IP_TOS) |
398 (1<<IP_TTL) | (1<<IP_HDRINCL) |
399 (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
400 (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND))) ||
401 optname == IP_MULTICAST_TTL ||
402 optname == IP_MULTICAST_LOOP) {
403 if (optlen >= sizeof(int)) {
404 if (get_user(val, (int *) optval))
406 } else if (optlen >= sizeof(char)) {
409 if (get_user(ucval, (unsigned char *) optval))
415 /* If optlen==0, it is equivalent to val == 0 */
417 #ifdef CONFIG_IP_MROUTE
418 if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
419 return ip_mroute_setsockopt(sk,optname,optval,optlen);
428 struct ip_options * opt = NULL;
429 if (optlen > 40 || optlen < 0)
431 err = ip_options_get(&opt, optval, optlen, 1);
434 if (sk->sk_type == SOCK_STREAM) {
435 struct tcp_opt *tp = tcp_sk(sk);
436 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
437 if (sk->sk_family == PF_INET ||
438 (!((1 << sk->sk_state) &
439 (TCPF_LISTEN | TCPF_CLOSE)) &&
440 inet->daddr != LOOPBACK4_IPV6)) {
443 tp->ext_header_len -= inet->opt->optlen;
445 tp->ext_header_len += opt->optlen;
446 tcp_sync_mss(sk, tp->pmtu_cookie);
447 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
451 opt = xchg(&inet->opt, opt);
458 inet->cmsg_flags |= IP_CMSG_PKTINFO;
460 inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
464 inet->cmsg_flags |= IP_CMSG_TTL;
466 inet->cmsg_flags &= ~IP_CMSG_TTL;
470 inet->cmsg_flags |= IP_CMSG_TOS;
472 inet->cmsg_flags &= ~IP_CMSG_TOS;
476 inet->cmsg_flags |= IP_CMSG_RECVOPTS;
478 inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
482 inet->cmsg_flags |= IP_CMSG_RETOPTS;
484 inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
486 case IP_TOS: /* This sets both TOS and Precedence */
487 if (sk->sk_type == SOCK_STREAM) {
489 val |= inet->tos & 3;
491 if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
492 !capable(CAP_NET_ADMIN)) {
496 if (inet->tos != val) {
498 sk->sk_priority = rt_tos2priority(val);
505 if (val != -1 && (val < 1 || val>255))
510 if (sk->sk_type != SOCK_RAW) {
514 inet->hdrincl = val ? 1 : 0;
516 case IP_MTU_DISCOVER:
519 inet->pmtudisc = val;
522 inet->recverr = !!val;
524 skb_queue_purge(&sk->sk_error_queue);
526 case IP_MULTICAST_TTL:
527 if (sk->sk_type == SOCK_STREAM)
533 if (val < 0 || val > 255)
537 case IP_MULTICAST_LOOP:
540 inet->mc_loop = !!val;
542 case IP_MULTICAST_IF:
544 struct ip_mreqn mreq;
545 struct net_device *dev = NULL;
547 if (sk->sk_type == SOCK_STREAM)
550 * Check the arguments are allowable
554 if (optlen >= sizeof(struct ip_mreqn)) {
555 if (copy_from_user(&mreq,optval,sizeof(mreq)))
558 memset(&mreq, 0, sizeof(mreq));
559 if (optlen >= sizeof(struct in_addr) &&
560 copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
564 if (!mreq.imr_ifindex) {
565 if (mreq.imr_address.s_addr == INADDR_ANY) {
571 dev = ip_dev_find(mreq.imr_address.s_addr);
573 mreq.imr_ifindex = dev->ifindex;
577 dev = __dev_get_by_index(mreq.imr_ifindex);
580 err = -EADDRNOTAVAIL;
585 if (sk->sk_bound_dev_if &&
586 mreq.imr_ifindex != sk->sk_bound_dev_if)
589 inet->mc_index = mreq.imr_ifindex;
590 inet->mc_addr = mreq.imr_address.s_addr;
595 case IP_ADD_MEMBERSHIP:
596 case IP_DROP_MEMBERSHIP:
598 struct ip_mreqn mreq;
600 if (optlen < sizeof(struct ip_mreq))
603 if (optlen >= sizeof(struct ip_mreqn)) {
604 if(copy_from_user(&mreq,optval,sizeof(mreq)))
607 memset(&mreq, 0, sizeof(mreq));
608 if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
612 if (optname == IP_ADD_MEMBERSHIP)
613 err = ip_mc_join_group(sk, &mreq);
615 err = ip_mc_leave_group(sk, &mreq);
620 extern int sysctl_optmem_max;
621 extern int sysctl_igmp_max_msf;
622 struct ip_msfilter *msf;
624 if (optlen < IP_MSFILTER_SIZE(0))
626 if (optlen > sysctl_optmem_max) {
630 msf = (struct ip_msfilter *)kmalloc(optlen, GFP_KERNEL);
636 if (copy_from_user(msf, optval, optlen)) {
640 /* numsrc >= (1G-4) overflow in 32 bits */
641 if (msf->imsf_numsrc >= 0x3ffffffcU ||
642 msf->imsf_numsrc > sysctl_igmp_max_msf) {
647 if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
652 err = ip_mc_msfilter(sk, msf, 0);
656 case IP_BLOCK_SOURCE:
657 case IP_UNBLOCK_SOURCE:
658 case IP_ADD_SOURCE_MEMBERSHIP:
659 case IP_DROP_SOURCE_MEMBERSHIP:
661 struct ip_mreq_source mreqs;
664 if (optlen != sizeof(struct ip_mreq_source))
666 if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
670 if (optname == IP_BLOCK_SOURCE) {
671 omode = MCAST_EXCLUDE;
673 } else if (optname == IP_UNBLOCK_SOURCE) {
674 omode = MCAST_EXCLUDE;
676 } else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
677 struct ip_mreqn mreq;
679 mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
680 mreq.imr_address.s_addr = mreqs.imr_interface;
681 mreq.imr_ifindex = 0;
682 err = ip_mc_join_group(sk, &mreq);
685 omode = MCAST_INCLUDE;
687 } else /*IP_DROP_SOURCE_MEMBERSHIP */ {
688 omode = MCAST_INCLUDE;
691 err = ip_mc_source(add, omode, sk, &mreqs, 0);
694 case MCAST_JOIN_GROUP:
695 case MCAST_LEAVE_GROUP:
697 struct group_req greq;
698 struct sockaddr_in *psin;
699 struct ip_mreqn mreq;
701 if (optlen < sizeof(struct group_req))
704 if(copy_from_user(&greq, optval, sizeof(greq)))
706 psin = (struct sockaddr_in *)&greq.gr_group;
707 if (psin->sin_family != AF_INET)
709 memset(&mreq, 0, sizeof(mreq));
710 mreq.imr_multiaddr = psin->sin_addr;
711 mreq.imr_ifindex = greq.gr_interface;
713 if (optname == MCAST_JOIN_GROUP)
714 err = ip_mc_join_group(sk, &mreq);
716 err = ip_mc_leave_group(sk, &mreq);
719 case MCAST_JOIN_SOURCE_GROUP:
720 case MCAST_LEAVE_SOURCE_GROUP:
721 case MCAST_BLOCK_SOURCE:
722 case MCAST_UNBLOCK_SOURCE:
724 struct group_source_req greqs;
725 struct ip_mreq_source mreqs;
726 struct sockaddr_in *psin;
729 if (optlen != sizeof(struct group_source_req))
731 if (copy_from_user(&greqs, optval, sizeof(greqs))) {
735 if (greqs.gsr_group.ss_family != AF_INET ||
736 greqs.gsr_source.ss_family != AF_INET) {
737 err = -EADDRNOTAVAIL;
740 psin = (struct sockaddr_in *)&greqs.gsr_group;
741 mreqs.imr_multiaddr = psin->sin_addr.s_addr;
742 psin = (struct sockaddr_in *)&greqs.gsr_source;
743 mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
744 mreqs.imr_interface = 0; /* use index for mc_source */
746 if (optname == MCAST_BLOCK_SOURCE) {
747 omode = MCAST_EXCLUDE;
749 } else if (optname == MCAST_UNBLOCK_SOURCE) {
750 omode = MCAST_EXCLUDE;
752 } else if (optname == MCAST_JOIN_SOURCE_GROUP) {
753 struct ip_mreqn mreq;
755 psin = (struct sockaddr_in *)&greqs.gsr_group;
756 mreq.imr_multiaddr = psin->sin_addr;
757 mreq.imr_address.s_addr = 0;
758 mreq.imr_ifindex = greqs.gsr_interface;
759 err = ip_mc_join_group(sk, &mreq);
762 omode = MCAST_INCLUDE;
764 } else /* MCAST_LEAVE_SOURCE_GROUP */ {
765 omode = MCAST_INCLUDE;
768 err = ip_mc_source(add, omode, sk, &mreqs,
769 greqs.gsr_interface);
774 extern int sysctl_optmem_max;
775 extern int sysctl_igmp_max_msf;
776 struct sockaddr_in *psin;
777 struct ip_msfilter *msf = 0;
778 struct group_filter *gsf = 0;
779 int msize, i, ifindex;
781 if (optlen < GROUP_FILTER_SIZE(0))
783 if (optlen > sysctl_optmem_max) {
787 gsf = (struct group_filter *)kmalloc(optlen,GFP_KERNEL);
793 if (copy_from_user(gsf, optval, optlen)) {
796 /* numsrc >= (4G-140)/128 overflow in 32 bits */
797 if (gsf->gf_numsrc >= 0x1ffffff ||
798 gsf->gf_numsrc > sysctl_igmp_max_msf) {
802 if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
806 msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
807 msf = (struct ip_msfilter *)kmalloc(msize,GFP_KERNEL);
812 ifindex = gsf->gf_interface;
813 psin = (struct sockaddr_in *)&gsf->gf_group;
814 if (psin->sin_family != AF_INET) {
815 err = -EADDRNOTAVAIL;
818 msf->imsf_multiaddr = psin->sin_addr.s_addr;
819 msf->imsf_interface = 0;
820 msf->imsf_fmode = gsf->gf_fmode;
821 msf->imsf_numsrc = gsf->gf_numsrc;
822 err = -EADDRNOTAVAIL;
823 for (i=0; i<gsf->gf_numsrc; ++i) {
824 psin = (struct sockaddr_in *)&gsf->gf_slist[i];
826 if (psin->sin_family != AF_INET)
828 msf->imsf_slist[i] = psin->sin_addr.s_addr;
833 err = ip_mc_msfilter(sk, msf, ifindex);
841 case IP_ROUTER_ALERT:
842 err = ip_ra_control(sk, val ? 1 : 0, NULL);
848 inet->freebind = !!val;
851 case IP_IPSEC_POLICY:
853 err = xfrm_user_policy(sk, optname, optval, optlen);
857 #ifdef CONFIG_NETFILTER
858 err = nf_setsockopt(sk, PF_INET, optname, optval,
874 * Get the options. Note for future reference. The GET of IP options gets the
875 * _received_ ones. The set sets the _sent_ ones.
878 int ip_getsockopt(struct sock *sk, int level, int optname, char *optval, int *optlen)
880 struct inet_opt *inet = inet_sk(sk);
887 #ifdef CONFIG_IP_MROUTE
888 if(optname>=MRT_BASE && optname <=MRT_BASE+10)
890 return ip_mroute_getsockopt(sk,optname,optval,optlen);
894 if(get_user(len,optlen))
904 unsigned char optbuf[sizeof(struct ip_options)+40];
905 struct ip_options * opt = (struct ip_options*)optbuf;
908 memcpy(optbuf, inet->opt,
909 sizeof(struct ip_options)+
913 if (opt->optlen == 0)
914 return put_user(0, optlen);
916 ip_options_undo(opt);
918 len = min_t(unsigned int, len, opt->optlen);
919 if(put_user(len, optlen))
921 if(copy_to_user(optval, opt->__data, len))
926 val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
929 val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
932 val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
935 val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
938 val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
944 val = (inet->uc_ttl == -1 ?
945 sysctl_ip_default_ttl :
951 case IP_MTU_DISCOVER:
952 val = inet->pmtudisc;
956 struct dst_entry *dst;
958 dst = sk_dst_get(sk);
960 val = dst_pmtu(dst) - dst->header_len;
972 case IP_MULTICAST_TTL:
975 case IP_MULTICAST_LOOP:
978 case IP_MULTICAST_IF:
981 len = min_t(unsigned int, len, sizeof(struct in_addr));
982 addr.s_addr = inet->mc_addr;
985 if(put_user(len, optlen))
987 if(copy_to_user((void *)optval, &addr, len))
993 struct ip_msfilter msf;
996 if (len < IP_MSFILTER_SIZE(0)) {
1000 if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
1004 err = ip_mc_msfget(sk, &msf,
1005 (struct ip_msfilter *)optval, optlen);
1009 case MCAST_MSFILTER:
1011 struct group_filter gsf;
1014 if (len < GROUP_FILTER_SIZE(0)) {
1018 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
1022 err = ip_mc_gsfget(sk, &gsf,
1023 (struct group_filter *)optval, optlen);
1033 if (sk->sk_type != SOCK_STREAM)
1034 return -ENOPROTOOPT;
1036 msg.msg_control = optval;
1037 msg.msg_controllen = len;
1040 if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
1041 struct in_pktinfo info;
1043 info.ipi_addr.s_addr = inet->rcv_saddr;
1044 info.ipi_spec_dst.s_addr = inet->rcv_saddr;
1045 info.ipi_ifindex = inet->mc_index;
1046 put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
1048 if (inet->cmsg_flags & IP_CMSG_TTL) {
1049 int hlim = inet->mc_ttl;
1050 put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
1052 len -= msg.msg_controllen;
1053 return put_user(len, optlen);
1056 val = inet->freebind;
1059 #ifdef CONFIG_NETFILTER
1060 val = nf_getsockopt(sk, PF_INET, optname, optval,
1064 val = put_user(len, optlen);
1068 return -ENOPROTOOPT;
1073 if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
1074 unsigned char ucval = (unsigned char)val;
1076 if(put_user(len, optlen))
1078 if(copy_to_user(optval,&ucval,1))
1081 len = min_t(unsigned int, sizeof(int), len);
1082 if(put_user(len, optlen))
1084 if(copy_to_user(optval,&val,len))
1090 EXPORT_SYMBOL(ip_cmsg_recv);
1092 #ifdef CONFIG_IP_SCTP_MODULE
1093 EXPORT_SYMBOL(ip_getsockopt);
1094 EXPORT_SYMBOL(ip_setsockopt);