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 <linux/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 void ip6_datagram_flow_key_init(struct flowi6 *fl6, struct sock *sk)
45 struct inet_sock *inet = inet_sk(sk);
46 struct ipv6_pinfo *np = inet6_sk(sk);
48 memset(fl6, 0, sizeof(*fl6));
49 fl6->flowi6_proto = sk->sk_protocol;
50 fl6->daddr = sk->sk_v6_daddr;
51 fl6->saddr = np->saddr;
52 fl6->flowi6_oif = sk->sk_bound_dev_if;
53 fl6->flowi6_mark = sk->sk_mark;
54 fl6->fl6_dport = inet->inet_dport;
55 fl6->fl6_sport = inet->inet_sport;
56 fl6->flowlabel = np->flow_label;
57 fl6->flowi6_uid = sk->sk_uid;
60 fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
62 if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr))
63 fl6->flowi6_oif = np->mcast_oif;
65 security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
68 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr)
70 struct ip6_flowlabel *flowlabel = NULL;
71 struct in6_addr *final_p, final;
72 struct ipv6_txoptions *opt;
73 struct dst_entry *dst;
74 struct inet_sock *inet = inet_sk(sk);
75 struct ipv6_pinfo *np = inet6_sk(sk);
79 if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) {
80 flowlabel = fl6_sock_lookup(sk, np->flow_label);
84 ip6_datagram_flow_key_init(&fl6, sk);
87 opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt);
88 final_p = fl6_update_dst(&fl6, opt, &final);
91 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
98 if (ipv6_addr_any(&np->saddr))
99 np->saddr = fl6.saddr;
101 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
102 sk->sk_v6_rcv_saddr = fl6.saddr;
103 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
104 if (sk->sk_prot->rehash)
105 sk->sk_prot->rehash(sk);
109 ip6_sk_dst_store_flow(sk, dst, &fl6);
112 fl6_sock_release(flowlabel);
116 void ip6_datagram_release_cb(struct sock *sk)
118 struct dst_entry *dst;
120 if (ipv6_addr_v4mapped(&sk->sk_v6_daddr))
124 dst = __sk_dst_get(sk);
125 if (!dst || !dst->obsolete ||
126 dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) {
132 ip6_datagram_dst_update(sk, false);
134 EXPORT_SYMBOL_GPL(ip6_datagram_release_cb);
136 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr,
139 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
140 struct inet_sock *inet = inet_sk(sk);
141 struct ipv6_pinfo *np = inet6_sk(sk);
142 struct in6_addr *daddr, old_daddr;
143 __be32 fl6_flowlabel = 0;
144 __be32 old_fl6_flowlabel;
149 if (usin->sin6_family == AF_INET) {
150 if (__ipv6_only_sock(sk))
151 return -EAFNOSUPPORT;
152 err = __ip4_datagram_connect(sk, uaddr, addr_len);
156 if (addr_len < SIN6_LEN_RFC2133)
159 if (usin->sin6_family != AF_INET6)
160 return -EAFNOSUPPORT;
163 fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
165 if (ipv6_addr_any(&usin->sin6_addr)) {
169 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
170 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
173 usin->sin6_addr = in6addr_loopback;
176 addr_type = ipv6_addr_type(&usin->sin6_addr);
178 daddr = &usin->sin6_addr;
180 if (addr_type & IPV6_ADDR_MAPPED) {
181 struct sockaddr_in sin;
183 if (__ipv6_only_sock(sk)) {
187 sin.sin_family = AF_INET;
188 sin.sin_addr.s_addr = daddr->s6_addr32[3];
189 sin.sin_port = usin->sin6_port;
191 err = __ip4_datagram_connect(sk,
192 (struct sockaddr *) &sin,
199 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
201 if (ipv6_addr_any(&np->saddr) ||
202 ipv6_mapped_addr_any(&np->saddr))
203 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
205 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
206 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
207 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
208 &sk->sk_v6_rcv_saddr);
209 if (sk->sk_prot->rehash)
210 sk->sk_prot->rehash(sk);
216 if (__ipv6_addr_needs_scope_id(addr_type)) {
217 if (addr_len >= sizeof(struct sockaddr_in6) &&
218 usin->sin6_scope_id) {
219 if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id)) {
223 sk->sk_bound_dev_if = usin->sin6_scope_id;
226 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
227 sk->sk_bound_dev_if = np->mcast_oif;
229 /* Connect to link-local address requires an interface */
230 if (!sk->sk_bound_dev_if) {
236 /* save the current peer information before updating it */
237 old_daddr = sk->sk_v6_daddr;
238 old_fl6_flowlabel = np->flow_label;
239 old_dport = inet->inet_dport;
241 sk->sk_v6_daddr = *daddr;
242 np->flow_label = fl6_flowlabel;
243 inet->inet_dport = usin->sin6_port;
246 * Check for a route to destination an obtain the
247 * destination cache for it.
250 err = ip6_datagram_dst_update(sk, true);
252 /* Restore the socket peer info, to keep it consistent with
253 * the old socket state
255 sk->sk_v6_daddr = old_daddr;
256 np->flow_label = old_fl6_flowlabel;
257 inet->inet_dport = old_dport;
261 sk->sk_state = TCP_ESTABLISHED;
266 EXPORT_SYMBOL_GPL(__ip6_datagram_connect);
268 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
273 res = __ip6_datagram_connect(sk, uaddr, addr_len);
277 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
279 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
282 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
283 if (sin6->sin6_family != AF_INET6)
284 return -EAFNOSUPPORT;
285 return ip6_datagram_connect(sk, uaddr, addr_len);
287 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
289 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
290 __be16 port, u32 info, u8 *payload)
292 struct ipv6_pinfo *np = inet6_sk(sk);
293 struct icmp6hdr *icmph = icmp6_hdr(skb);
294 struct sock_exterr_skb *serr;
299 skb = skb_clone(skb, GFP_ATOMIC);
303 skb->protocol = htons(ETH_P_IPV6);
305 serr = SKB_EXT_ERR(skb);
306 serr->ee.ee_errno = err;
307 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
308 serr->ee.ee_type = icmph->icmp6_type;
309 serr->ee.ee_code = icmph->icmp6_code;
311 serr->ee.ee_info = info;
312 serr->ee.ee_data = 0;
313 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
314 skb_network_header(skb);
317 __skb_pull(skb, payload - skb->data);
318 skb_reset_transport_header(skb);
320 if (sock_queue_err_skb(sk, skb))
324 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
326 const struct ipv6_pinfo *np = inet6_sk(sk);
327 struct sock_exterr_skb *serr;
334 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
338 skb->protocol = htons(ETH_P_IPV6);
340 skb_put(skb, sizeof(struct ipv6hdr));
341 skb_reset_network_header(skb);
343 iph->daddr = fl6->daddr;
344 ip6_flow_hdr(iph, 0, 0);
346 serr = SKB_EXT_ERR(skb);
347 serr->ee.ee_errno = err;
348 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
349 serr->ee.ee_type = 0;
350 serr->ee.ee_code = 0;
352 serr->ee.ee_info = info;
353 serr->ee.ee_data = 0;
354 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
355 serr->port = fl6->fl6_dport;
357 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
358 skb_reset_transport_header(skb);
360 if (sock_queue_err_skb(sk, skb))
364 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
366 struct ipv6_pinfo *np = inet6_sk(sk);
369 struct ip6_mtuinfo *mtu_info;
371 if (!np->rxopt.bits.rxpmtu)
374 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
378 skb_put(skb, sizeof(struct ipv6hdr));
379 skb_reset_network_header(skb);
381 iph->daddr = fl6->daddr;
383 mtu_info = IP6CBMTU(skb);
385 mtu_info->ip6m_mtu = mtu;
386 mtu_info->ip6m_addr.sin6_family = AF_INET6;
387 mtu_info->ip6m_addr.sin6_port = 0;
388 mtu_info->ip6m_addr.sin6_flowinfo = 0;
389 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
390 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
392 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
393 skb_reset_transport_header(skb);
395 skb = xchg(&np->rxpmtu, skb);
399 /* For some errors we have valid addr_offset even with zero payload and
400 * zero port. Also, addr_offset should be supported if port is set.
402 static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
404 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
405 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
406 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
409 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
411 * At one point, excluding local errors was a quick test to identify icmp/icmp6
412 * errors. This is no longer true, but the test remained, so the v6 stack,
413 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
415 static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
416 struct sock_exterr_skb *serr)
418 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
419 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
422 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
425 if (!IP6CB(skb)->iif)
432 * Handle MSG_ERRQUEUE
434 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
436 struct ipv6_pinfo *np = inet6_sk(sk);
437 struct sock_exterr_skb *serr;
439 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
441 struct sock_extended_err ee;
442 struct sockaddr_in6 offender;
448 skb = sock_dequeue_err_skb(sk);
454 msg->msg_flags |= MSG_TRUNC;
457 err = skb_copy_datagram_msg(skb, 0, msg, copied);
462 sock_recv_timestamp(msg, sk, skb);
464 serr = SKB_EXT_ERR(skb);
466 if (sin && ipv6_datagram_support_addr(serr)) {
467 const unsigned char *nh = skb_network_header(skb);
468 sin->sin6_family = AF_INET6;
469 sin->sin6_flowinfo = 0;
470 sin->sin6_port = serr->port;
471 if (skb->protocol == htons(ETH_P_IPV6)) {
472 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
473 struct ipv6hdr, daddr);
474 sin->sin6_addr = ip6h->daddr;
476 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
478 ipv6_iface_scope_id(&sin->sin6_addr,
481 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
483 sin->sin6_scope_id = 0;
485 *addr_len = sizeof(*sin);
488 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
489 sin = &errhdr.offender;
490 memset(sin, 0, sizeof(*sin));
492 if (ip6_datagram_support_cmsg(skb, serr)) {
493 sin->sin6_family = AF_INET6;
495 ip6_datagram_recv_common_ctl(sk, msg, skb);
496 if (skb->protocol == htons(ETH_P_IPV6)) {
497 sin->sin6_addr = ipv6_hdr(skb)->saddr;
499 ip6_datagram_recv_specific_ctl(sk, msg, skb);
501 ipv6_iface_scope_id(&sin->sin6_addr,
504 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
506 if (inet_sk(sk)->cmsg_flags)
507 ip_cmsg_recv(msg, skb);
511 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
513 /* Now we could try to dump offended packet options */
515 msg->msg_flags |= MSG_ERRQUEUE;
522 EXPORT_SYMBOL_GPL(ipv6_recv_error);
525 * Handle IPV6_RECVPATHMTU
527 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
530 struct ipv6_pinfo *np = inet6_sk(sk);
532 struct ip6_mtuinfo mtu_info;
533 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
538 skb = xchg(&np->rxpmtu, NULL);
544 msg->msg_flags |= MSG_TRUNC;
547 err = skb_copy_datagram_msg(skb, 0, msg, copied);
551 sock_recv_timestamp(msg, sk, skb);
553 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
556 sin->sin6_family = AF_INET6;
557 sin->sin6_flowinfo = 0;
559 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
560 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
561 *addr_len = sizeof(*sin);
564 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
575 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
578 struct ipv6_pinfo *np = inet6_sk(sk);
579 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
581 if (np->rxopt.bits.rxinfo) {
582 struct in6_pktinfo src_info;
585 src_info.ipi6_ifindex = IP6CB(skb)->iif;
586 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
588 src_info.ipi6_ifindex =
589 PKTINFO_SKB_CB(skb)->ipi_ifindex;
590 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
591 &src_info.ipi6_addr);
594 if (src_info.ipi6_ifindex >= 0)
595 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
596 sizeof(src_info), &src_info);
600 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
603 struct ipv6_pinfo *np = inet6_sk(sk);
604 struct inet6_skb_parm *opt = IP6CB(skb);
605 unsigned char *nh = skb_network_header(skb);
607 if (np->rxopt.bits.rxhlim) {
608 int hlim = ipv6_hdr(skb)->hop_limit;
609 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
612 if (np->rxopt.bits.rxtclass) {
613 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
614 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
617 if (np->rxopt.bits.rxflow) {
618 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
620 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
623 /* HbH is allowed only once */
624 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
625 u8 *ptr = nh + sizeof(struct ipv6hdr);
626 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
630 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
632 * Silly enough, but we need to reparse in order to
633 * report extension headers (except for HbH)
636 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
637 * (and WILL NOT be) defined because
638 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
640 unsigned int off = sizeof(struct ipv6hdr);
641 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
643 while (off <= opt->lastopt) {
648 case IPPROTO_DSTOPTS:
650 len = (ptr[1] + 1) << 3;
651 if (np->rxopt.bits.dstopts)
652 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
654 case IPPROTO_ROUTING:
656 len = (ptr[1] + 1) << 3;
657 if (np->rxopt.bits.srcrt)
658 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
662 len = (ptr[1] + 2) << 2;
666 len = (ptr[1] + 1) << 3;
674 /* socket options in old style */
675 if (np->rxopt.bits.rxoinfo) {
676 struct in6_pktinfo src_info;
678 src_info.ipi6_ifindex = opt->iif;
679 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
680 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
682 if (np->rxopt.bits.rxohlim) {
683 int hlim = ipv6_hdr(skb)->hop_limit;
684 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
686 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
687 u8 *ptr = nh + sizeof(struct ipv6hdr);
688 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
690 if (np->rxopt.bits.odstopts && opt->dst0) {
691 u8 *ptr = nh + opt->dst0;
692 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
694 if (np->rxopt.bits.osrcrt && opt->srcrt) {
695 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
696 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
698 if (np->rxopt.bits.odstopts && opt->dst1) {
699 u8 *ptr = nh + opt->dst1;
700 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
702 if (np->rxopt.bits.rxorigdstaddr) {
703 struct sockaddr_in6 sin6;
704 __be16 _ports[2], *ports;
706 ports = skb_header_pointer(skb, skb_transport_offset(skb),
707 sizeof(_ports), &_ports);
709 /* All current transport protocols have the port numbers in the
710 * first four bytes of the transport header and this function is
711 * written with this assumption in mind.
713 sin6.sin6_family = AF_INET6;
714 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
715 sin6.sin6_port = ports[1];
716 sin6.sin6_flowinfo = 0;
718 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
721 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
724 if (np->rxopt.bits.recvfragsize && opt->frag_max_size) {
725 int val = opt->frag_max_size;
727 put_cmsg(msg, SOL_IPV6, IPV6_RECVFRAGSIZE, sizeof(val), &val);
731 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
734 ip6_datagram_recv_common_ctl(sk, msg, skb);
735 ip6_datagram_recv_specific_ctl(sk, msg, skb);
737 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
739 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
740 struct msghdr *msg, struct flowi6 *fl6,
741 struct ipcm6_cookie *ipc6)
743 struct in6_pktinfo *src_info;
744 struct cmsghdr *cmsg;
745 struct ipv6_rt_hdr *rthdr;
746 struct ipv6_opt_hdr *hdr;
747 struct ipv6_txoptions *opt = ipc6->opt;
751 for_each_cmsghdr(cmsg, msg) {
754 if (!CMSG_OK(msg, cmsg)) {
759 if (cmsg->cmsg_level == SOL_SOCKET) {
760 err = __sock_cmsg_send(sk, msg, cmsg, &ipc6->sockc);
766 if (cmsg->cmsg_level != SOL_IPV6)
769 switch (cmsg->cmsg_type) {
771 case IPV6_2292PKTINFO:
773 struct net_device *dev = NULL;
776 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
781 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
782 src_idx = src_info->ipi6_ifindex;
785 if (fl6->flowi6_oif &&
786 src_idx != fl6->flowi6_oif &&
787 (sk->sk_bound_dev_if != fl6->flowi6_oif ||
788 !sk_dev_equal_l3scope(sk, src_idx)))
790 fl6->flowi6_oif = src_idx;
793 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
796 if (fl6->flowi6_oif) {
797 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
802 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
807 if (addr_type != IPV6_ADDR_ANY) {
808 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
809 if (!ipv6_can_nonlocal_bind(net, inet_sk(sk)) &&
810 !ipv6_chk_addr_and_flags(net, &src_info->ipi6_addr,
813 !ipv6_chk_acast_addr_src(net, dev,
814 &src_info->ipi6_addr))
817 fl6->saddr = src_info->ipi6_addr;
829 if (cmsg->cmsg_len < CMSG_LEN(4)) {
834 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
835 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
840 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
843 case IPV6_2292HOPOPTS:
845 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
850 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
851 len = ((hdr->hdrlen + 1) << 3);
852 if (cmsg->cmsg_len < CMSG_LEN(len)) {
856 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
860 opt->opt_nflen += len;
864 case IPV6_2292DSTOPTS:
865 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
870 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
871 len = ((hdr->hdrlen + 1) << 3);
872 if (cmsg->cmsg_len < CMSG_LEN(len)) {
876 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
884 opt->opt_flen += len;
889 case IPV6_RTHDRDSTOPTS:
890 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
895 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
896 len = ((hdr->hdrlen + 1) << 3);
897 if (cmsg->cmsg_len < CMSG_LEN(len)) {
901 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
905 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
906 opt->opt_flen += len;
909 opt->opt_nflen += len;
916 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
921 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
923 switch (rthdr->type) {
924 #if IS_ENABLED(CONFIG_IPV6_MIP6)
925 case IPV6_SRCRT_TYPE_2:
926 if (rthdr->hdrlen != 2 ||
927 rthdr->segments_left != 1) {
938 len = ((rthdr->hdrlen + 1) << 3);
940 if (cmsg->cmsg_len < CMSG_LEN(len)) {
945 /* segments left must also match */
946 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
951 opt->opt_nflen += len;
954 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
955 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
957 opt->opt_nflen += dsthdrlen;
958 opt->dst0opt = opt->dst1opt;
960 opt->opt_flen -= dsthdrlen;
965 case IPV6_2292HOPLIMIT:
967 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
972 ipc6->hlimit = *(int *)CMSG_DATA(cmsg);
973 if (ipc6->hlimit < -1 || ipc6->hlimit > 0xff) {
985 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
988 tc = *(int *)CMSG_DATA(cmsg);
989 if (tc < -1 || tc > 0xff)
1003 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
1006 df = *(int *)CMSG_DATA(cmsg);
1007 if (df < 0 || df > 1)
1011 ipc6->dontfrag = df;
1016 net_dbg_ratelimited("invalid cmsg type: %d\n",
1026 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
1028 void __ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
1029 __u16 srcp, __u16 destp, int rqueue, int bucket)
1031 const struct in6_addr *dest, *src;
1033 dest = &sp->sk_v6_daddr;
1034 src = &sp->sk_v6_rcv_saddr;
1036 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1037 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
1039 src->s6_addr32[0], src->s6_addr32[1],
1040 src->s6_addr32[2], src->s6_addr32[3], srcp,
1041 dest->s6_addr32[0], dest->s6_addr32[1],
1042 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1044 sk_wmem_alloc_get(sp),
1047 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1050 refcount_read(&sp->sk_refcnt), sp,
1051 atomic_read(&sp->sk_drops));