3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
14 #include <linux/capability.h>
15 #include <linux/errno.h>
16 #include <linux/types.h>
17 #include <linux/kernel.h>
18 #include <linux/interrupt.h>
19 #include <linux/socket.h>
20 #include <linux/sockios.h>
21 #include <linux/in6.h>
22 #include <linux/ipv6.h>
23 #include <linux/route.h>
24 #include <linux/slab.h>
25 #include <linux/export.h>
28 #include <net/ndisc.h>
29 #include <net/addrconf.h>
30 #include <net/transp_v6.h>
31 #include <net/ip6_route.h>
32 #include <net/tcp_states.h>
33 #include <net/dsfield.h>
35 #include <linux/errqueue.h>
36 #include <asm/uaccess.h>
38 static bool ipv6_mapped_addr_any(const struct in6_addr *a)
40 return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0);
43 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
45 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
46 struct inet_sock *inet = inet_sk(sk);
47 struct ipv6_pinfo *np = inet6_sk(sk);
48 struct in6_addr *daddr, *final_p, final;
49 struct dst_entry *dst;
51 struct ip6_flowlabel *flowlabel = NULL;
52 struct ipv6_txoptions *opt;
56 if (usin->sin6_family == AF_INET) {
57 if (__ipv6_only_sock(sk))
59 err = ip4_datagram_connect(sk, uaddr, addr_len);
63 if (addr_len < SIN6_LEN_RFC2133)
66 if (usin->sin6_family != AF_INET6)
69 memset(&fl6, 0, sizeof(fl6));
71 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
72 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
73 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
74 if (flowlabel == NULL)
76 usin->sin6_addr = flowlabel->dst;
80 addr_type = ipv6_addr_type(&usin->sin6_addr);
82 if (addr_type == IPV6_ADDR_ANY) {
86 usin->sin6_addr.s6_addr[15] = 0x01;
89 daddr = &usin->sin6_addr;
91 if (addr_type == IPV6_ADDR_MAPPED) {
92 struct sockaddr_in sin;
94 if (__ipv6_only_sock(sk)) {
98 sin.sin_family = AF_INET;
99 sin.sin_addr.s_addr = daddr->s6_addr32[3];
100 sin.sin_port = usin->sin6_port;
102 err = ip4_datagram_connect(sk,
103 (struct sockaddr *) &sin,
110 ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr);
112 if (ipv6_addr_any(&np->saddr) ||
113 ipv6_mapped_addr_any(&np->saddr))
114 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
116 if (ipv6_addr_any(&np->rcv_saddr) ||
117 ipv6_mapped_addr_any(&np->rcv_saddr)) {
118 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
120 if (sk->sk_prot->rehash)
121 sk->sk_prot->rehash(sk);
127 if (__ipv6_addr_needs_scope_id(addr_type)) {
128 if (addr_len >= sizeof(struct sockaddr_in6) &&
129 usin->sin6_scope_id) {
130 if (sk->sk_bound_dev_if &&
131 sk->sk_bound_dev_if != usin->sin6_scope_id) {
135 sk->sk_bound_dev_if = usin->sin6_scope_id;
138 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
139 sk->sk_bound_dev_if = np->mcast_oif;
141 /* Connect to link-local address requires an interface */
142 if (!sk->sk_bound_dev_if) {
149 np->flow_label = fl6.flowlabel;
151 inet->inet_dport = usin->sin6_port;
154 * Check for a route to destination an obtain the
155 * destination cache for it.
158 fl6.flowi6_proto = sk->sk_protocol;
159 fl6.daddr = np->daddr;
160 fl6.saddr = np->saddr;
161 fl6.flowi6_oif = sk->sk_bound_dev_if;
162 fl6.flowi6_mark = sk->sk_mark;
163 fl6.fl6_dport = inet->inet_dport;
164 fl6.fl6_sport = inet->inet_sport;
166 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
167 fl6.flowi6_oif = np->mcast_oif;
169 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
171 opt = flowlabel ? flowlabel->opt : np->opt;
172 final_p = fl6_update_dst(&fl6, opt, &final);
174 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
181 /* source address lookup done in ip6_dst_lookup */
183 if (ipv6_addr_any(&np->saddr))
184 np->saddr = fl6.saddr;
186 if (ipv6_addr_any(&np->rcv_saddr)) {
187 np->rcv_saddr = fl6.saddr;
188 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
189 if (sk->sk_prot->rehash)
190 sk->sk_prot->rehash(sk);
193 ip6_dst_store(sk, dst,
194 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
196 #ifdef CONFIG_IPV6_SUBTREES
197 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
202 sk->sk_state = TCP_ESTABLISHED;
204 fl6_sock_release(flowlabel);
207 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
209 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
210 __be16 port, u32 info, u8 *payload)
212 struct ipv6_pinfo *np = inet6_sk(sk);
213 struct icmp6hdr *icmph = icmp6_hdr(skb);
214 struct sock_exterr_skb *serr;
219 skb = skb_clone(skb, GFP_ATOMIC);
223 skb->protocol = htons(ETH_P_IPV6);
225 serr = SKB_EXT_ERR(skb);
226 serr->ee.ee_errno = err;
227 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
228 serr->ee.ee_type = icmph->icmp6_type;
229 serr->ee.ee_code = icmph->icmp6_code;
231 serr->ee.ee_info = info;
232 serr->ee.ee_data = 0;
233 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
234 skb_network_header(skb);
237 __skb_pull(skb, payload - skb->data);
238 skb_reset_transport_header(skb);
240 if (sock_queue_err_skb(sk, skb))
244 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
246 struct ipv6_pinfo *np = inet6_sk(sk);
247 struct sock_exterr_skb *serr;
254 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
258 skb->protocol = htons(ETH_P_IPV6);
260 skb_put(skb, sizeof(struct ipv6hdr));
261 skb_reset_network_header(skb);
263 iph->daddr = fl6->daddr;
265 serr = SKB_EXT_ERR(skb);
266 serr->ee.ee_errno = err;
267 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
268 serr->ee.ee_type = 0;
269 serr->ee.ee_code = 0;
271 serr->ee.ee_info = info;
272 serr->ee.ee_data = 0;
273 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
274 serr->port = fl6->fl6_dport;
276 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
277 skb_reset_transport_header(skb);
279 if (sock_queue_err_skb(sk, skb))
283 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
285 struct ipv6_pinfo *np = inet6_sk(sk);
288 struct ip6_mtuinfo *mtu_info;
290 if (!np->rxopt.bits.rxpmtu)
293 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
297 skb_put(skb, sizeof(struct ipv6hdr));
298 skb_reset_network_header(skb);
300 iph->daddr = fl6->daddr;
302 mtu_info = IP6CBMTU(skb);
304 mtu_info->ip6m_mtu = mtu;
305 mtu_info->ip6m_addr.sin6_family = AF_INET6;
306 mtu_info->ip6m_addr.sin6_port = 0;
307 mtu_info->ip6m_addr.sin6_flowinfo = 0;
308 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
309 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
311 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
312 skb_reset_transport_header(skb);
314 skb = xchg(&np->rxpmtu, skb);
319 * Handle MSG_ERRQUEUE
321 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
323 struct ipv6_pinfo *np = inet6_sk(sk);
324 struct sock_exterr_skb *serr;
325 struct sk_buff *skb, *skb2;
326 struct sockaddr_in6 *sin;
328 struct sock_extended_err ee;
329 struct sockaddr_in6 offender;
335 skb = skb_dequeue(&sk->sk_error_queue);
341 msg->msg_flags |= MSG_TRUNC;
344 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
348 sock_recv_timestamp(msg, sk, skb);
350 serr = SKB_EXT_ERR(skb);
352 sin = (struct sockaddr_in6 *)msg->msg_name;
354 const unsigned char *nh = skb_network_header(skb);
355 sin->sin6_family = AF_INET6;
356 sin->sin6_flowinfo = 0;
357 sin->sin6_port = serr->port;
358 if (skb->protocol == htons(ETH_P_IPV6)) {
359 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
360 struct ipv6hdr, daddr);
361 sin->sin6_addr = ip6h->daddr;
363 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
365 ipv6_iface_scope_id(&sin->sin6_addr,
368 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
370 sin->sin6_scope_id = 0;
374 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
375 sin = &errhdr.offender;
376 sin->sin6_family = AF_UNSPEC;
377 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
378 sin->sin6_family = AF_INET6;
379 sin->sin6_flowinfo = 0;
380 if (skb->protocol == htons(ETH_P_IPV6)) {
381 sin->sin6_addr = ipv6_hdr(skb)->saddr;
383 ip6_datagram_recv_ctl(sk, msg, skb);
385 ipv6_iface_scope_id(&sin->sin6_addr,
388 struct inet_sock *inet = inet_sk(sk);
390 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
392 sin->sin6_scope_id = 0;
393 if (inet->cmsg_flags)
394 ip_cmsg_recv(msg, skb);
398 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
400 /* Now we could try to dump offended packet options */
402 msg->msg_flags |= MSG_ERRQUEUE;
405 /* Reset and regenerate socket error */
406 spin_lock_bh(&sk->sk_error_queue.lock);
408 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
409 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
410 spin_unlock_bh(&sk->sk_error_queue.lock);
411 sk->sk_error_report(sk);
413 spin_unlock_bh(&sk->sk_error_queue.lock);
421 EXPORT_SYMBOL_GPL(ipv6_recv_error);
424 * Handle IPV6_RECVPATHMTU
426 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len)
428 struct ipv6_pinfo *np = inet6_sk(sk);
430 struct sockaddr_in6 *sin;
431 struct ip6_mtuinfo mtu_info;
436 skb = xchg(&np->rxpmtu, NULL);
442 msg->msg_flags |= MSG_TRUNC;
445 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
449 sock_recv_timestamp(msg, sk, skb);
451 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
453 sin = (struct sockaddr_in6 *)msg->msg_name;
455 sin->sin6_family = AF_INET6;
456 sin->sin6_flowinfo = 0;
458 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
459 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
462 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
473 int ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
476 struct ipv6_pinfo *np = inet6_sk(sk);
477 struct inet6_skb_parm *opt = IP6CB(skb);
478 unsigned char *nh = skb_network_header(skb);
480 if (np->rxopt.bits.rxinfo) {
481 struct in6_pktinfo src_info;
483 src_info.ipi6_ifindex = opt->iif;
484 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
485 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
488 if (np->rxopt.bits.rxhlim) {
489 int hlim = ipv6_hdr(skb)->hop_limit;
490 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
493 if (np->rxopt.bits.rxtclass) {
494 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
495 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
498 if (np->rxopt.bits.rxflow) {
499 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
501 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
504 /* HbH is allowed only once */
505 if (np->rxopt.bits.hopopts && opt->hop) {
506 u8 *ptr = nh + opt->hop;
507 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
511 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
513 * Silly enough, but we need to reparse in order to
514 * report extension headers (except for HbH)
517 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
518 * (and WILL NOT be) defined because
519 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
521 unsigned int off = sizeof(struct ipv6hdr);
522 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
524 while (off <= opt->lastopt) {
529 case IPPROTO_DSTOPTS:
531 len = (ptr[1] + 1) << 3;
532 if (np->rxopt.bits.dstopts)
533 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
535 case IPPROTO_ROUTING:
537 len = (ptr[1] + 1) << 3;
538 if (np->rxopt.bits.srcrt)
539 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
543 len = (ptr[1] + 2) << 2;
547 len = (ptr[1] + 1) << 3;
555 /* socket options in old style */
556 if (np->rxopt.bits.rxoinfo) {
557 struct in6_pktinfo src_info;
559 src_info.ipi6_ifindex = opt->iif;
560 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
561 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
563 if (np->rxopt.bits.rxohlim) {
564 int hlim = ipv6_hdr(skb)->hop_limit;
565 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
567 if (np->rxopt.bits.ohopopts && opt->hop) {
568 u8 *ptr = nh + opt->hop;
569 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
571 if (np->rxopt.bits.odstopts && opt->dst0) {
572 u8 *ptr = nh + opt->dst0;
573 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
575 if (np->rxopt.bits.osrcrt && opt->srcrt) {
576 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
577 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
579 if (np->rxopt.bits.odstopts && opt->dst1) {
580 u8 *ptr = nh + opt->dst1;
581 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
583 if (np->rxopt.bits.rxorigdstaddr) {
584 struct sockaddr_in6 sin6;
585 __be16 *ports = (__be16 *) skb_transport_header(skb);
587 if (skb_transport_offset(skb) + 4 <= skb->len) {
588 /* All current transport protocols have the port numbers in the
589 * first four bytes of the transport header and this function is
590 * written with this assumption in mind.
593 sin6.sin6_family = AF_INET6;
594 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
595 sin6.sin6_port = ports[1];
596 sin6.sin6_flowinfo = 0;
598 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
601 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
606 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
608 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
609 struct msghdr *msg, struct flowi6 *fl6,
610 struct ipv6_txoptions *opt,
611 int *hlimit, int *tclass, int *dontfrag)
613 struct in6_pktinfo *src_info;
614 struct cmsghdr *cmsg;
615 struct ipv6_rt_hdr *rthdr;
616 struct ipv6_opt_hdr *hdr;
620 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
623 if (!CMSG_OK(msg, cmsg)) {
628 if (cmsg->cmsg_level != SOL_IPV6)
631 switch (cmsg->cmsg_type) {
633 case IPV6_2292PKTINFO:
635 struct net_device *dev = NULL;
637 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
642 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
644 if (src_info->ipi6_ifindex) {
645 if (fl6->flowi6_oif &&
646 src_info->ipi6_ifindex != fl6->flowi6_oif)
648 fl6->flowi6_oif = src_info->ipi6_ifindex;
651 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
654 if (fl6->flowi6_oif) {
655 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
660 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
665 if (addr_type != IPV6_ADDR_ANY) {
666 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
667 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
668 !ipv6_chk_addr(net, &src_info->ipi6_addr,
669 strict ? dev : NULL, 0))
672 fl6->saddr = src_info->ipi6_addr;
684 if (cmsg->cmsg_len < CMSG_LEN(4)) {
689 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
690 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
695 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
698 case IPV6_2292HOPOPTS:
700 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
705 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
706 len = ((hdr->hdrlen + 1) << 3);
707 if (cmsg->cmsg_len < CMSG_LEN(len)) {
711 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
715 opt->opt_nflen += len;
719 case IPV6_2292DSTOPTS:
720 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
725 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
726 len = ((hdr->hdrlen + 1) << 3);
727 if (cmsg->cmsg_len < CMSG_LEN(len)) {
731 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
739 opt->opt_flen += len;
744 case IPV6_RTHDRDSTOPTS:
745 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
750 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
751 len = ((hdr->hdrlen + 1) << 3);
752 if (cmsg->cmsg_len < CMSG_LEN(len)) {
756 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
760 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
761 opt->opt_flen += len;
764 opt->opt_nflen += len;
771 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
776 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
778 switch (rthdr->type) {
779 #if IS_ENABLED(CONFIG_IPV6_MIP6)
780 case IPV6_SRCRT_TYPE_2:
781 if (rthdr->hdrlen != 2 ||
782 rthdr->segments_left != 1) {
793 len = ((rthdr->hdrlen + 1) << 3);
795 if (cmsg->cmsg_len < CMSG_LEN(len)) {
800 /* segments left must also match */
801 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
806 opt->opt_nflen += len;
809 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
810 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
812 opt->opt_nflen += dsthdrlen;
813 opt->dst0opt = opt->dst1opt;
815 opt->opt_flen -= dsthdrlen;
820 case IPV6_2292HOPLIMIT:
822 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
827 *hlimit = *(int *)CMSG_DATA(cmsg);
828 if (*hlimit < -1 || *hlimit > 0xff) {
840 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
843 tc = *(int *)CMSG_DATA(cmsg);
844 if (tc < -1 || tc > 0xff)
858 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
861 df = *(int *)CMSG_DATA(cmsg);
862 if (df < 0 || df > 1)
871 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
881 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);