1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Linux INET6 implementation
7 * Pedro Roque <roque@di.fc.ul.pt>
10 #include <linux/capability.h>
11 #include <linux/errno.h>
12 #include <linux/types.h>
13 #include <linux/kernel.h>
14 #include <linux/interrupt.h>
15 #include <linux/socket.h>
16 #include <linux/sockios.h>
17 #include <linux/in6.h>
18 #include <linux/ipv6.h>
19 #include <linux/route.h>
20 #include <linux/slab.h>
21 #include <linux/export.h>
22 #include <linux/icmp.h>
25 #include <net/ndisc.h>
26 #include <net/addrconf.h>
27 #include <net/transp_v6.h>
28 #include <net/ip6_route.h>
29 #include <net/tcp_states.h>
30 #include <net/dsfield.h>
31 #include <net/sock_reuseport.h>
33 #include <linux/errqueue.h>
34 #include <linux/uaccess.h>
36 static bool ipv6_mapped_addr_any(const struct in6_addr *a)
38 return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0);
41 static void ip6_datagram_flow_key_init(struct flowi6 *fl6, struct sock *sk)
43 struct inet_sock *inet = inet_sk(sk);
44 struct ipv6_pinfo *np = inet6_sk(sk);
45 int oif = sk->sk_bound_dev_if;
47 memset(fl6, 0, sizeof(*fl6));
48 fl6->flowi6_proto = sk->sk_protocol;
49 fl6->daddr = sk->sk_v6_daddr;
50 fl6->saddr = np->saddr;
51 fl6->flowi6_mark = sk->sk_mark;
52 fl6->fl6_dport = inet->inet_dport;
53 fl6->fl6_sport = inet->inet_sport;
54 fl6->flowlabel = ip6_make_flowinfo(np->tclass, np->flow_label);
55 fl6->flowi6_uid = sk->sk_uid;
58 oif = np->sticky_pktinfo.ipi6_ifindex;
61 if (ipv6_addr_is_multicast(&fl6->daddr))
67 fl6->flowi6_oif = oif;
68 security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6));
71 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr)
73 struct ip6_flowlabel *flowlabel = NULL;
74 struct in6_addr *final_p, final;
75 struct ipv6_txoptions *opt;
76 struct dst_entry *dst;
77 struct inet_sock *inet = inet_sk(sk);
78 struct ipv6_pinfo *np = inet6_sk(sk);
82 if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) {
83 flowlabel = fl6_sock_lookup(sk, np->flow_label);
84 if (IS_ERR(flowlabel))
87 ip6_datagram_flow_key_init(&fl6, sk);
90 opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt);
91 final_p = fl6_update_dst(&fl6, opt, &final);
94 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
101 if (ipv6_addr_any(&np->saddr))
102 np->saddr = fl6.saddr;
104 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
105 sk->sk_v6_rcv_saddr = fl6.saddr;
106 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
107 if (sk->sk_prot->rehash)
108 sk->sk_prot->rehash(sk);
112 ip6_sk_dst_store_flow(sk, dst, &fl6);
115 fl6_sock_release(flowlabel);
119 void ip6_datagram_release_cb(struct sock *sk)
121 struct dst_entry *dst;
123 if (ipv6_addr_v4mapped(&sk->sk_v6_daddr))
127 dst = __sk_dst_get(sk);
128 if (!dst || !dst->obsolete ||
129 dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) {
135 ip6_datagram_dst_update(sk, false);
137 EXPORT_SYMBOL_GPL(ip6_datagram_release_cb);
139 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr,
142 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
143 struct inet_sock *inet = inet_sk(sk);
144 struct ipv6_pinfo *np = inet6_sk(sk);
145 struct in6_addr *daddr, old_daddr;
146 __be32 fl6_flowlabel = 0;
147 __be32 old_fl6_flowlabel;
152 if (usin->sin6_family == AF_INET) {
153 if (ipv6_only_sock(sk))
154 return -EAFNOSUPPORT;
155 err = __ip4_datagram_connect(sk, uaddr, addr_len);
159 if (addr_len < SIN6_LEN_RFC2133)
162 if (usin->sin6_family != AF_INET6)
163 return -EAFNOSUPPORT;
166 fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
168 if (ipv6_addr_any(&usin->sin6_addr)) {
172 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
173 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
176 usin->sin6_addr = in6addr_loopback;
179 addr_type = ipv6_addr_type(&usin->sin6_addr);
181 daddr = &usin->sin6_addr;
183 if (addr_type & IPV6_ADDR_MAPPED) {
184 struct sockaddr_in sin;
186 if (ipv6_only_sock(sk)) {
190 sin.sin_family = AF_INET;
191 sin.sin_addr.s_addr = daddr->s6_addr32[3];
192 sin.sin_port = usin->sin6_port;
194 err = __ip4_datagram_connect(sk,
195 (struct sockaddr *) &sin,
202 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
204 if (ipv6_addr_any(&np->saddr) ||
205 ipv6_mapped_addr_any(&np->saddr))
206 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
208 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
209 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
210 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
211 &sk->sk_v6_rcv_saddr);
212 if (sk->sk_prot->rehash)
213 sk->sk_prot->rehash(sk);
219 if (__ipv6_addr_needs_scope_id(addr_type)) {
220 if (addr_len >= sizeof(struct sockaddr_in6) &&
221 usin->sin6_scope_id) {
222 if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id)) {
226 WRITE_ONCE(sk->sk_bound_dev_if, usin->sin6_scope_id);
229 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
230 WRITE_ONCE(sk->sk_bound_dev_if, np->mcast_oif);
232 /* Connect to link-local address requires an interface */
233 if (!sk->sk_bound_dev_if) {
239 /* save the current peer information before updating it */
240 old_daddr = sk->sk_v6_daddr;
241 old_fl6_flowlabel = np->flow_label;
242 old_dport = inet->inet_dport;
244 sk->sk_v6_daddr = *daddr;
245 np->flow_label = fl6_flowlabel;
246 inet->inet_dport = usin->sin6_port;
249 * Check for a route to destination an obtain the
250 * destination cache for it.
253 err = ip6_datagram_dst_update(sk, true);
255 /* Restore the socket peer info, to keep it consistent with
256 * the old socket state
258 sk->sk_v6_daddr = old_daddr;
259 np->flow_label = old_fl6_flowlabel;
260 inet->inet_dport = old_dport;
264 reuseport_has_conns_set(sk);
265 sk->sk_state = TCP_ESTABLISHED;
270 EXPORT_SYMBOL_GPL(__ip6_datagram_connect);
272 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
277 res = __ip6_datagram_connect(sk, uaddr, addr_len);
281 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
283 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
286 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
287 if (sin6->sin6_family != AF_INET6)
288 return -EAFNOSUPPORT;
289 return ip6_datagram_connect(sk, uaddr, addr_len);
291 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
293 static void ipv6_icmp_error_rfc4884(const struct sk_buff *skb,
294 struct sock_ee_data_rfc4884 *out)
296 switch (icmp6_hdr(skb)->icmp6_type) {
297 case ICMPV6_TIME_EXCEED:
298 case ICMPV6_DEST_UNREACH:
299 ip_icmp_error_rfc4884(skb, out, sizeof(struct icmp6hdr),
300 icmp6_hdr(skb)->icmp6_datagram_len * 8);
304 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
305 __be16 port, u32 info, u8 *payload)
307 struct ipv6_pinfo *np = inet6_sk(sk);
308 struct icmp6hdr *icmph = icmp6_hdr(skb);
309 struct sock_exterr_skb *serr;
314 skb = skb_clone(skb, GFP_ATOMIC);
318 skb->protocol = htons(ETH_P_IPV6);
320 serr = SKB_EXT_ERR(skb);
321 serr->ee.ee_errno = err;
322 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
323 serr->ee.ee_type = icmph->icmp6_type;
324 serr->ee.ee_code = icmph->icmp6_code;
326 serr->ee.ee_info = info;
327 serr->ee.ee_data = 0;
328 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
329 skb_network_header(skb);
332 __skb_pull(skb, payload - skb->data);
334 if (inet6_sk(sk)->recverr_rfc4884)
335 ipv6_icmp_error_rfc4884(skb, &serr->ee.ee_rfc4884);
337 skb_reset_transport_header(skb);
339 if (sock_queue_err_skb(sk, skb))
343 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
345 const struct ipv6_pinfo *np = inet6_sk(sk);
346 struct sock_exterr_skb *serr;
353 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
357 skb->protocol = htons(ETH_P_IPV6);
359 skb_put(skb, sizeof(struct ipv6hdr));
360 skb_reset_network_header(skb);
362 iph->daddr = fl6->daddr;
363 ip6_flow_hdr(iph, 0, 0);
365 serr = SKB_EXT_ERR(skb);
366 serr->ee.ee_errno = err;
367 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
368 serr->ee.ee_type = 0;
369 serr->ee.ee_code = 0;
371 serr->ee.ee_info = info;
372 serr->ee.ee_data = 0;
373 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
374 serr->port = fl6->fl6_dport;
376 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
377 skb_reset_transport_header(skb);
379 if (sock_queue_err_skb(sk, skb))
383 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
385 struct ipv6_pinfo *np = inet6_sk(sk);
388 struct ip6_mtuinfo *mtu_info;
390 if (!np->rxopt.bits.rxpmtu)
393 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
397 skb_put(skb, sizeof(struct ipv6hdr));
398 skb_reset_network_header(skb);
400 iph->daddr = fl6->daddr;
402 mtu_info = IP6CBMTU(skb);
404 mtu_info->ip6m_mtu = mtu;
405 mtu_info->ip6m_addr.sin6_family = AF_INET6;
406 mtu_info->ip6m_addr.sin6_port = 0;
407 mtu_info->ip6m_addr.sin6_flowinfo = 0;
408 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
409 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
411 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
412 skb_reset_transport_header(skb);
414 skb = xchg(&np->rxpmtu, skb);
418 /* For some errors we have valid addr_offset even with zero payload and
419 * zero port. Also, addr_offset should be supported if port is set.
421 static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
423 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
424 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
425 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
428 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
430 * At one point, excluding local errors was a quick test to identify icmp/icmp6
431 * errors. This is no longer true, but the test remained, so the v6 stack,
432 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
434 static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
435 struct sock_exterr_skb *serr)
437 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
438 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
441 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
444 if (!IP6CB(skb)->iif)
451 * Handle MSG_ERRQUEUE
453 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
455 struct ipv6_pinfo *np = inet6_sk(sk);
456 struct sock_exterr_skb *serr;
458 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
460 struct sock_extended_err ee;
461 struct sockaddr_in6 offender;
467 skb = sock_dequeue_err_skb(sk);
473 msg->msg_flags |= MSG_TRUNC;
476 err = skb_copy_datagram_msg(skb, 0, msg, copied);
481 sock_recv_timestamp(msg, sk, skb);
483 serr = SKB_EXT_ERR(skb);
485 if (sin && ipv6_datagram_support_addr(serr)) {
486 const unsigned char *nh = skb_network_header(skb);
487 sin->sin6_family = AF_INET6;
488 sin->sin6_flowinfo = 0;
489 sin->sin6_port = serr->port;
490 if (skb->protocol == htons(ETH_P_IPV6)) {
491 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
492 struct ipv6hdr, daddr);
493 sin->sin6_addr = ip6h->daddr;
495 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
497 ipv6_iface_scope_id(&sin->sin6_addr,
500 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
502 sin->sin6_scope_id = 0;
504 *addr_len = sizeof(*sin);
507 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
508 sin = &errhdr.offender;
509 memset(sin, 0, sizeof(*sin));
511 if (ip6_datagram_support_cmsg(skb, serr)) {
512 sin->sin6_family = AF_INET6;
514 ip6_datagram_recv_common_ctl(sk, msg, skb);
515 if (skb->protocol == htons(ETH_P_IPV6)) {
516 sin->sin6_addr = ipv6_hdr(skb)->saddr;
518 ip6_datagram_recv_specific_ctl(sk, msg, skb);
520 ipv6_iface_scope_id(&sin->sin6_addr,
523 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
525 if (inet_sk(sk)->cmsg_flags)
526 ip_cmsg_recv(msg, skb);
530 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
532 /* Now we could try to dump offended packet options */
534 msg->msg_flags |= MSG_ERRQUEUE;
541 EXPORT_SYMBOL_GPL(ipv6_recv_error);
544 * Handle IPV6_RECVPATHMTU
546 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
549 struct ipv6_pinfo *np = inet6_sk(sk);
551 struct ip6_mtuinfo mtu_info;
552 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
557 skb = xchg(&np->rxpmtu, NULL);
563 msg->msg_flags |= MSG_TRUNC;
566 err = skb_copy_datagram_msg(skb, 0, msg, copied);
570 sock_recv_timestamp(msg, sk, skb);
572 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
575 sin->sin6_family = AF_INET6;
576 sin->sin6_flowinfo = 0;
578 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
579 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
580 *addr_len = sizeof(*sin);
583 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
594 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
597 struct ipv6_pinfo *np = inet6_sk(sk);
598 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
600 if (np->rxopt.bits.rxinfo) {
601 struct in6_pktinfo src_info;
604 src_info.ipi6_ifindex = IP6CB(skb)->iif;
605 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
607 src_info.ipi6_ifindex =
608 PKTINFO_SKB_CB(skb)->ipi_ifindex;
609 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
610 &src_info.ipi6_addr);
613 if (src_info.ipi6_ifindex >= 0)
614 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
615 sizeof(src_info), &src_info);
619 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
622 struct ipv6_pinfo *np = inet6_sk(sk);
623 struct inet6_skb_parm *opt = IP6CB(skb);
624 unsigned char *nh = skb_network_header(skb);
626 if (np->rxopt.bits.rxhlim) {
627 int hlim = ipv6_hdr(skb)->hop_limit;
628 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
631 if (np->rxopt.bits.rxtclass) {
632 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
633 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
636 if (np->rxopt.bits.rxflow) {
637 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
639 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
642 /* HbH is allowed only once */
643 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
644 u8 *ptr = nh + sizeof(struct ipv6hdr);
645 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
649 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
651 * Silly enough, but we need to reparse in order to
652 * report extension headers (except for HbH)
655 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
656 * (and WILL NOT be) defined because
657 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
659 unsigned int off = sizeof(struct ipv6hdr);
660 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
662 while (off <= opt->lastopt) {
667 case IPPROTO_DSTOPTS:
669 len = (ptr[1] + 1) << 3;
670 if (np->rxopt.bits.dstopts)
671 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
673 case IPPROTO_ROUTING:
675 len = (ptr[1] + 1) << 3;
676 if (np->rxopt.bits.srcrt)
677 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
681 len = (ptr[1] + 2) << 2;
685 len = (ptr[1] + 1) << 3;
693 /* socket options in old style */
694 if (np->rxopt.bits.rxoinfo) {
695 struct in6_pktinfo src_info;
697 src_info.ipi6_ifindex = opt->iif;
698 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
699 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
701 if (np->rxopt.bits.rxohlim) {
702 int hlim = ipv6_hdr(skb)->hop_limit;
703 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
705 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
706 u8 *ptr = nh + sizeof(struct ipv6hdr);
707 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
709 if (np->rxopt.bits.odstopts && opt->dst0) {
710 u8 *ptr = nh + opt->dst0;
711 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
713 if (np->rxopt.bits.osrcrt && opt->srcrt) {
714 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
715 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
717 if (np->rxopt.bits.odstopts && opt->dst1) {
718 u8 *ptr = nh + opt->dst1;
719 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
721 if (np->rxopt.bits.rxorigdstaddr) {
722 struct sockaddr_in6 sin6;
723 __be16 _ports[2], *ports;
725 ports = skb_header_pointer(skb, skb_transport_offset(skb),
726 sizeof(_ports), &_ports);
728 /* All current transport protocols have the port numbers in the
729 * first four bytes of the transport header and this function is
730 * written with this assumption in mind.
732 sin6.sin6_family = AF_INET6;
733 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
734 sin6.sin6_port = ports[1];
735 sin6.sin6_flowinfo = 0;
737 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
740 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
743 if (np->rxopt.bits.recvfragsize && opt->frag_max_size) {
744 int val = opt->frag_max_size;
746 put_cmsg(msg, SOL_IPV6, IPV6_RECVFRAGSIZE, sizeof(val), &val);
750 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
753 ip6_datagram_recv_common_ctl(sk, msg, skb);
754 ip6_datagram_recv_specific_ctl(sk, msg, skb);
756 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
758 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
759 struct msghdr *msg, struct flowi6 *fl6,
760 struct ipcm6_cookie *ipc6)
762 struct in6_pktinfo *src_info;
763 struct cmsghdr *cmsg;
764 struct ipv6_rt_hdr *rthdr;
765 struct ipv6_opt_hdr *hdr;
766 struct ipv6_txoptions *opt = ipc6->opt;
770 for_each_cmsghdr(cmsg, msg) {
773 if (!CMSG_OK(msg, cmsg)) {
778 if (cmsg->cmsg_level == SOL_SOCKET) {
779 err = __sock_cmsg_send(sk, msg, cmsg, &ipc6->sockc);
785 if (cmsg->cmsg_level != SOL_IPV6)
788 switch (cmsg->cmsg_type) {
790 case IPV6_2292PKTINFO:
792 struct net_device *dev = NULL;
795 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
800 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
801 src_idx = src_info->ipi6_ifindex;
804 if (fl6->flowi6_oif &&
805 src_idx != fl6->flowi6_oif &&
806 (READ_ONCE(sk->sk_bound_dev_if) != fl6->flowi6_oif ||
807 !sk_dev_equal_l3scope(sk, src_idx)))
809 fl6->flowi6_oif = src_idx;
812 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
815 if (fl6->flowi6_oif) {
816 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
821 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
826 if (addr_type != IPV6_ADDR_ANY) {
827 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
828 if (!ipv6_can_nonlocal_bind(net, inet_sk(sk)) &&
829 !ipv6_chk_addr_and_flags(net, &src_info->ipi6_addr,
832 !ipv6_chk_acast_addr_src(net, dev,
833 &src_info->ipi6_addr))
836 fl6->saddr = src_info->ipi6_addr;
848 if (cmsg->cmsg_len < CMSG_LEN(4)) {
853 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
854 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
859 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
862 case IPV6_2292HOPOPTS:
864 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
869 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
870 len = ((hdr->hdrlen + 1) << 3);
871 if (cmsg->cmsg_len < CMSG_LEN(len)) {
875 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
879 opt->opt_nflen += len;
883 case IPV6_2292DSTOPTS:
884 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
889 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
890 len = ((hdr->hdrlen + 1) << 3);
891 if (cmsg->cmsg_len < CMSG_LEN(len)) {
895 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
903 opt->opt_flen += len;
908 case IPV6_RTHDRDSTOPTS:
909 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
914 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
915 len = ((hdr->hdrlen + 1) << 3);
916 if (cmsg->cmsg_len < CMSG_LEN(len)) {
920 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
924 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
925 opt->opt_flen += len;
928 opt->opt_nflen += len;
935 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
940 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
942 switch (rthdr->type) {
943 #if IS_ENABLED(CONFIG_IPV6_MIP6)
944 case IPV6_SRCRT_TYPE_2:
945 if (rthdr->hdrlen != 2 ||
946 rthdr->segments_left != 1) {
957 len = ((rthdr->hdrlen + 1) << 3);
959 if (cmsg->cmsg_len < CMSG_LEN(len)) {
964 /* segments left must also match */
965 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
970 opt->opt_nflen += len;
973 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
974 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
976 opt->opt_nflen += dsthdrlen;
977 opt->dst0opt = opt->dst1opt;
979 opt->opt_flen -= dsthdrlen;
984 case IPV6_2292HOPLIMIT:
986 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
991 ipc6->hlimit = *(int *)CMSG_DATA(cmsg);
992 if (ipc6->hlimit < -1 || ipc6->hlimit > 0xff) {
1004 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
1007 tc = *(int *)CMSG_DATA(cmsg);
1008 if (tc < -1 || tc > 0xff)
1022 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
1025 df = *(int *)CMSG_DATA(cmsg);
1026 if (df < 0 || df > 1)
1030 ipc6->dontfrag = df;
1035 net_dbg_ratelimited("invalid cmsg type: %d\n",
1045 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
1047 void __ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
1048 __u16 srcp, __u16 destp, int rqueue, int bucket)
1050 const struct in6_addr *dest, *src;
1052 dest = &sp->sk_v6_daddr;
1053 src = &sp->sk_v6_rcv_saddr;
1055 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1056 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
1058 src->s6_addr32[0], src->s6_addr32[1],
1059 src->s6_addr32[2], src->s6_addr32[3], srcp,
1060 dest->s6_addr32[0], dest->s6_addr32[1],
1061 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1063 sk_wmem_alloc_get(sp),
1066 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1069 refcount_read(&sp->sk_refcnt), sp,
1070 atomic_read(&sp->sk_drops));