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 static 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);
79 addr_type = ipv6_addr_type(&usin->sin6_addr);
81 if (addr_type == IPV6_ADDR_ANY) {
85 usin->sin6_addr.s6_addr[15] = 0x01;
88 daddr = &usin->sin6_addr;
90 if (addr_type == IPV6_ADDR_MAPPED) {
91 struct sockaddr_in sin;
93 if (__ipv6_only_sock(sk)) {
97 sin.sin_family = AF_INET;
98 sin.sin_addr.s_addr = daddr->s6_addr32[3];
99 sin.sin_port = usin->sin6_port;
101 err = __ip4_datagram_connect(sk,
102 (struct sockaddr *) &sin,
109 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
111 if (ipv6_addr_any(&np->saddr) ||
112 ipv6_mapped_addr_any(&np->saddr))
113 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
115 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
116 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
117 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
118 &sk->sk_v6_rcv_saddr);
119 if (sk->sk_prot->rehash)
120 sk->sk_prot->rehash(sk);
126 if (__ipv6_addr_needs_scope_id(addr_type)) {
127 if (addr_len >= sizeof(struct sockaddr_in6) &&
128 usin->sin6_scope_id) {
129 if (sk->sk_bound_dev_if &&
130 sk->sk_bound_dev_if != usin->sin6_scope_id) {
134 sk->sk_bound_dev_if = usin->sin6_scope_id;
137 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
138 sk->sk_bound_dev_if = np->mcast_oif;
140 /* Connect to link-local address requires an interface */
141 if (!sk->sk_bound_dev_if) {
147 sk->sk_v6_daddr = *daddr;
148 np->flow_label = fl6.flowlabel;
150 inet->inet_dport = usin->sin6_port;
153 * Check for a route to destination an obtain the
154 * destination cache for it.
157 fl6.flowi6_proto = sk->sk_protocol;
158 fl6.daddr = sk->sk_v6_daddr;
159 fl6.saddr = np->saddr;
160 fl6.flowi6_oif = sk->sk_bound_dev_if;
161 fl6.flowi6_mark = sk->sk_mark;
162 fl6.fl6_dport = inet->inet_dport;
163 fl6.fl6_sport = inet->inet_sport;
164 fl6.flowi6_uid = sock_i_uid(sk);
167 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
169 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
170 fl6.flowi6_oif = np->mcast_oif;
172 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
175 opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt);
176 final_p = fl6_update_dst(&fl6, opt, &final);
179 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
186 /* source address lookup done in ip6_dst_lookup */
188 if (ipv6_addr_any(&np->saddr))
189 np->saddr = fl6.saddr;
191 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
192 sk->sk_v6_rcv_saddr = fl6.saddr;
193 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
194 if (sk->sk_prot->rehash)
195 sk->sk_prot->rehash(sk);
198 ip6_dst_store(sk, dst,
199 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
200 &sk->sk_v6_daddr : NULL,
201 #ifdef CONFIG_IPV6_SUBTREES
202 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
207 sk->sk_state = TCP_ESTABLISHED;
210 fl6_sock_release(flowlabel);
214 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
219 res = __ip6_datagram_connect(sk, uaddr, addr_len);
223 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
225 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
228 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
229 if (sin6->sin6_family != AF_INET6)
230 return -EAFNOSUPPORT;
231 return ip6_datagram_connect(sk, uaddr, addr_len);
233 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
235 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
236 __be16 port, u32 info, u8 *payload)
238 struct ipv6_pinfo *np = inet6_sk(sk);
239 struct icmp6hdr *icmph = icmp6_hdr(skb);
240 struct sock_exterr_skb *serr;
245 skb = skb_clone(skb, GFP_ATOMIC);
249 skb->protocol = htons(ETH_P_IPV6);
251 serr = SKB_EXT_ERR(skb);
252 serr->ee.ee_errno = err;
253 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
254 serr->ee.ee_type = icmph->icmp6_type;
255 serr->ee.ee_code = icmph->icmp6_code;
257 serr->ee.ee_info = info;
258 serr->ee.ee_data = 0;
259 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
260 skb_network_header(skb);
263 __skb_pull(skb, payload - skb->data);
264 skb_reset_transport_header(skb);
266 if (sock_queue_err_skb(sk, skb))
270 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
272 const struct ipv6_pinfo *np = inet6_sk(sk);
273 struct sock_exterr_skb *serr;
280 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
284 skb->protocol = htons(ETH_P_IPV6);
286 skb_put(skb, sizeof(struct ipv6hdr));
287 skb_reset_network_header(skb);
289 iph->daddr = fl6->daddr;
291 serr = SKB_EXT_ERR(skb);
292 serr->ee.ee_errno = err;
293 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
294 serr->ee.ee_type = 0;
295 serr->ee.ee_code = 0;
297 serr->ee.ee_info = info;
298 serr->ee.ee_data = 0;
299 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
300 serr->port = fl6->fl6_dport;
302 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
303 skb_reset_transport_header(skb);
305 if (sock_queue_err_skb(sk, skb))
309 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
311 struct ipv6_pinfo *np = inet6_sk(sk);
314 struct ip6_mtuinfo *mtu_info;
316 if (!np->rxopt.bits.rxpmtu)
319 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
323 skb_put(skb, sizeof(struct ipv6hdr));
324 skb_reset_network_header(skb);
326 iph->daddr = fl6->daddr;
328 mtu_info = IP6CBMTU(skb);
330 mtu_info->ip6m_mtu = mtu;
331 mtu_info->ip6m_addr.sin6_family = AF_INET6;
332 mtu_info->ip6m_addr.sin6_port = 0;
333 mtu_info->ip6m_addr.sin6_flowinfo = 0;
334 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
335 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
337 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
338 skb_reset_transport_header(skb);
340 skb = xchg(&np->rxpmtu, skb);
344 /* For some errors we have valid addr_offset even with zero payload and
345 * zero port. Also, addr_offset should be supported if port is set.
347 static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
349 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
350 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
351 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
354 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
356 * At one point, excluding local errors was a quick test to identify icmp/icmp6
357 * errors. This is no longer true, but the test remained, so the v6 stack,
358 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
360 * Timestamp code paths do not initialize the fields expected by cmsg:
361 * the PKTINFO fields in skb->cb[]. Fill those in here.
363 static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
364 struct sock_exterr_skb *serr)
366 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
367 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
370 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
376 if (skb->protocol == htons(ETH_P_IPV6))
377 IP6CB(skb)->iif = skb->dev->ifindex;
379 PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex;
385 * Handle MSG_ERRQUEUE
387 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
389 struct ipv6_pinfo *np = inet6_sk(sk);
390 struct sock_exterr_skb *serr;
392 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
394 struct sock_extended_err ee;
395 struct sockaddr_in6 offender;
401 skb = sock_dequeue_err_skb(sk);
407 msg->msg_flags |= MSG_TRUNC;
410 err = skb_copy_datagram_msg(skb, 0, msg, copied);
414 sock_recv_timestamp(msg, sk, skb);
416 serr = SKB_EXT_ERR(skb);
418 if (sin && ipv6_datagram_support_addr(serr)) {
419 const unsigned char *nh = skb_network_header(skb);
420 sin->sin6_family = AF_INET6;
421 sin->sin6_flowinfo = 0;
422 sin->sin6_port = serr->port;
423 if (skb->protocol == htons(ETH_P_IPV6)) {
424 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
425 struct ipv6hdr, daddr);
426 sin->sin6_addr = ip6h->daddr;
428 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
430 ipv6_iface_scope_id(&sin->sin6_addr,
433 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
435 sin->sin6_scope_id = 0;
437 *addr_len = sizeof(*sin);
440 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
441 sin = &errhdr.offender;
442 memset(sin, 0, sizeof(*sin));
444 if (ip6_datagram_support_cmsg(skb, serr)) {
445 sin->sin6_family = AF_INET6;
447 ip6_datagram_recv_common_ctl(sk, msg, skb);
448 if (skb->protocol == htons(ETH_P_IPV6)) {
449 sin->sin6_addr = ipv6_hdr(skb)->saddr;
451 ip6_datagram_recv_specific_ctl(sk, msg, skb);
453 ipv6_iface_scope_id(&sin->sin6_addr,
456 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
458 if (inet_sk(sk)->cmsg_flags)
459 ip_cmsg_recv(msg, skb);
463 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
465 /* Now we could try to dump offended packet options */
467 msg->msg_flags |= MSG_ERRQUEUE;
475 EXPORT_SYMBOL_GPL(ipv6_recv_error);
478 * Handle IPV6_RECVPATHMTU
480 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
483 struct ipv6_pinfo *np = inet6_sk(sk);
485 struct ip6_mtuinfo mtu_info;
486 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
491 skb = xchg(&np->rxpmtu, NULL);
497 msg->msg_flags |= MSG_TRUNC;
500 err = skb_copy_datagram_msg(skb, 0, msg, copied);
504 sock_recv_timestamp(msg, sk, skb);
506 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
509 sin->sin6_family = AF_INET6;
510 sin->sin6_flowinfo = 0;
512 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
513 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
514 *addr_len = sizeof(*sin);
517 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
528 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
531 struct ipv6_pinfo *np = inet6_sk(sk);
532 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
534 if (np->rxopt.bits.rxinfo) {
535 struct in6_pktinfo src_info;
538 src_info.ipi6_ifindex = IP6CB(skb)->iif;
539 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
541 src_info.ipi6_ifindex =
542 PKTINFO_SKB_CB(skb)->ipi_ifindex;
543 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
544 &src_info.ipi6_addr);
547 if (src_info.ipi6_ifindex >= 0)
548 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
549 sizeof(src_info), &src_info);
553 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
556 struct ipv6_pinfo *np = inet6_sk(sk);
557 struct inet6_skb_parm *opt = IP6CB(skb);
558 unsigned char *nh = skb_network_header(skb);
560 if (np->rxopt.bits.rxhlim) {
561 int hlim = ipv6_hdr(skb)->hop_limit;
562 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
565 if (np->rxopt.bits.rxtclass) {
566 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
567 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
570 if (np->rxopt.bits.rxflow) {
571 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
573 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
576 /* HbH is allowed only once */
577 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
578 u8 *ptr = nh + sizeof(struct ipv6hdr);
579 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
583 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
585 * Silly enough, but we need to reparse in order to
586 * report extension headers (except for HbH)
589 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
590 * (and WILL NOT be) defined because
591 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
593 unsigned int off = sizeof(struct ipv6hdr);
594 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
596 while (off <= opt->lastopt) {
601 case IPPROTO_DSTOPTS:
603 len = (ptr[1] + 1) << 3;
604 if (np->rxopt.bits.dstopts)
605 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
607 case IPPROTO_ROUTING:
609 len = (ptr[1] + 1) << 3;
610 if (np->rxopt.bits.srcrt)
611 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
615 len = (ptr[1] + 2) << 2;
619 len = (ptr[1] + 1) << 3;
627 /* socket options in old style */
628 if (np->rxopt.bits.rxoinfo) {
629 struct in6_pktinfo src_info;
631 src_info.ipi6_ifindex = opt->iif;
632 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
633 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
635 if (np->rxopt.bits.rxohlim) {
636 int hlim = ipv6_hdr(skb)->hop_limit;
637 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
639 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
640 u8 *ptr = nh + sizeof(struct ipv6hdr);
641 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
643 if (np->rxopt.bits.odstopts && opt->dst0) {
644 u8 *ptr = nh + opt->dst0;
645 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
647 if (np->rxopt.bits.osrcrt && opt->srcrt) {
648 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
649 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
651 if (np->rxopt.bits.odstopts && opt->dst1) {
652 u8 *ptr = nh + opt->dst1;
653 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
655 if (np->rxopt.bits.rxorigdstaddr) {
656 struct sockaddr_in6 sin6;
657 __be16 *ports = (__be16 *) skb_transport_header(skb);
659 if (skb_transport_offset(skb) + 4 <= skb->len) {
660 /* All current transport protocols have the port numbers in the
661 * first four bytes of the transport header and this function is
662 * written with this assumption in mind.
665 sin6.sin6_family = AF_INET6;
666 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
667 sin6.sin6_port = ports[1];
668 sin6.sin6_flowinfo = 0;
670 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
673 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
678 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
681 ip6_datagram_recv_common_ctl(sk, msg, skb);
682 ip6_datagram_recv_specific_ctl(sk, msg, skb);
684 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
686 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
687 struct msghdr *msg, struct flowi6 *fl6,
688 struct ipv6_txoptions *opt,
689 int *hlimit, int *tclass, int *dontfrag)
691 struct in6_pktinfo *src_info;
692 struct cmsghdr *cmsg;
693 struct ipv6_rt_hdr *rthdr;
694 struct ipv6_opt_hdr *hdr;
698 for_each_cmsghdr(cmsg, msg) {
701 if (!CMSG_OK(msg, cmsg)) {
706 if (cmsg->cmsg_level != SOL_IPV6)
709 switch (cmsg->cmsg_type) {
711 case IPV6_2292PKTINFO:
713 struct net_device *dev = NULL;
715 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
720 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
722 if (src_info->ipi6_ifindex) {
723 if (fl6->flowi6_oif &&
724 src_info->ipi6_ifindex != fl6->flowi6_oif)
726 fl6->flowi6_oif = src_info->ipi6_ifindex;
729 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
732 if (fl6->flowi6_oif) {
733 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
738 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
743 if (addr_type != IPV6_ADDR_ANY) {
744 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
745 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
746 !ipv6_chk_addr(net, &src_info->ipi6_addr,
747 strict ? dev : NULL, 0) &&
748 !ipv6_chk_acast_addr_src(net, dev,
749 &src_info->ipi6_addr))
752 fl6->saddr = src_info->ipi6_addr;
764 if (cmsg->cmsg_len < CMSG_LEN(4)) {
769 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
770 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
775 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
778 case IPV6_2292HOPOPTS:
780 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
785 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
786 len = ((hdr->hdrlen + 1) << 3);
787 if (cmsg->cmsg_len < CMSG_LEN(len)) {
791 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
795 opt->opt_nflen += len;
799 case IPV6_2292DSTOPTS:
800 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
805 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
806 len = ((hdr->hdrlen + 1) << 3);
807 if (cmsg->cmsg_len < CMSG_LEN(len)) {
811 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
819 opt->opt_flen += len;
824 case IPV6_RTHDRDSTOPTS:
825 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
830 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
831 len = ((hdr->hdrlen + 1) << 3);
832 if (cmsg->cmsg_len < CMSG_LEN(len)) {
836 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
840 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
841 opt->opt_flen += len;
844 opt->opt_nflen += len;
851 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
856 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
858 switch (rthdr->type) {
859 #if IS_ENABLED(CONFIG_IPV6_MIP6)
860 case IPV6_SRCRT_TYPE_2:
861 if (rthdr->hdrlen != 2 ||
862 rthdr->segments_left != 1) {
873 len = ((rthdr->hdrlen + 1) << 3);
875 if (cmsg->cmsg_len < CMSG_LEN(len)) {
880 /* segments left must also match */
881 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
886 opt->opt_nflen += len;
889 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
890 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
892 opt->opt_nflen += dsthdrlen;
893 opt->dst0opt = opt->dst1opt;
895 opt->opt_flen -= dsthdrlen;
900 case IPV6_2292HOPLIMIT:
902 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
907 *hlimit = *(int *)CMSG_DATA(cmsg);
908 if (*hlimit < -1 || *hlimit > 0xff) {
920 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
923 tc = *(int *)CMSG_DATA(cmsg);
924 if (tc < -1 || tc > 0xff)
938 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
941 df = *(int *)CMSG_DATA(cmsg);
942 if (df < 0 || df > 1)
951 net_dbg_ratelimited("invalid cmsg type: %d\n",
961 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
963 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
964 __u16 srcp, __u16 destp, int bucket)
966 const struct in6_addr *dest, *src;
968 dest = &sp->sk_v6_daddr;
969 src = &sp->sk_v6_rcv_saddr;
971 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
972 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
974 src->s6_addr32[0], src->s6_addr32[1],
975 src->s6_addr32[2], src->s6_addr32[3], srcp,
976 dest->s6_addr32[0], dest->s6_addr32[1],
977 dest->s6_addr32[2], dest->s6_addr32[3], destp,
979 sk_wmem_alloc_get(sp),
980 sk_rmem_alloc_get(sp),
982 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
985 atomic_read(&sp->sk_refcnt), sp,
986 atomic_read(&sp->sk_drops));