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>
24 #include <net/ndisc.h>
25 #include <net/addrconf.h>
26 #include <net/transp_v6.h>
27 #include <net/ip6_route.h>
28 #include <net/tcp_states.h>
29 #include <net/dsfield.h>
31 #include <linux/errqueue.h>
32 #include <linux/uaccess.h>
34 static bool ipv6_mapped_addr_any(const struct in6_addr *a)
36 return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0);
39 static void ip6_datagram_flow_key_init(struct flowi6 *fl6, struct sock *sk)
41 struct inet_sock *inet = inet_sk(sk);
42 struct ipv6_pinfo *np = inet6_sk(sk);
44 memset(fl6, 0, sizeof(*fl6));
45 fl6->flowi6_proto = sk->sk_protocol;
46 fl6->daddr = sk->sk_v6_daddr;
47 fl6->saddr = np->saddr;
48 fl6->flowi6_oif = sk->sk_bound_dev_if;
49 fl6->flowi6_mark = sk->sk_mark;
50 fl6->fl6_dport = inet->inet_dport;
51 fl6->fl6_sport = inet->inet_sport;
52 fl6->flowlabel = np->flow_label;
53 fl6->flowi6_uid = sk->sk_uid;
56 fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
58 if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr))
59 fl6->flowi6_oif = np->mcast_oif;
61 security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
64 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr)
66 struct ip6_flowlabel *flowlabel = NULL;
67 struct in6_addr *final_p, final;
68 struct ipv6_txoptions *opt;
69 struct dst_entry *dst;
70 struct inet_sock *inet = inet_sk(sk);
71 struct ipv6_pinfo *np = inet6_sk(sk);
75 if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) {
76 flowlabel = fl6_sock_lookup(sk, np->flow_label);
77 if (IS_ERR(flowlabel))
80 ip6_datagram_flow_key_init(&fl6, sk);
83 opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt);
84 final_p = fl6_update_dst(&fl6, opt, &final);
87 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
94 if (ipv6_addr_any(&np->saddr))
95 np->saddr = fl6.saddr;
97 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
98 sk->sk_v6_rcv_saddr = fl6.saddr;
99 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
100 if (sk->sk_prot->rehash)
101 sk->sk_prot->rehash(sk);
105 ip6_sk_dst_store_flow(sk, dst, &fl6);
108 fl6_sock_release(flowlabel);
112 void ip6_datagram_release_cb(struct sock *sk)
114 struct dst_entry *dst;
116 if (ipv6_addr_v4mapped(&sk->sk_v6_daddr))
120 dst = __sk_dst_get(sk);
121 if (!dst || !dst->obsolete ||
122 dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) {
128 ip6_datagram_dst_update(sk, false);
130 EXPORT_SYMBOL_GPL(ip6_datagram_release_cb);
132 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr,
135 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
136 struct inet_sock *inet = inet_sk(sk);
137 struct ipv6_pinfo *np = inet6_sk(sk);
138 struct in6_addr *daddr, old_daddr;
139 __be32 fl6_flowlabel = 0;
140 __be32 old_fl6_flowlabel;
145 if (usin->sin6_family == AF_INET) {
146 if (__ipv6_only_sock(sk))
147 return -EAFNOSUPPORT;
148 err = __ip4_datagram_connect(sk, uaddr, addr_len);
152 if (addr_len < SIN6_LEN_RFC2133)
155 if (usin->sin6_family != AF_INET6)
156 return -EAFNOSUPPORT;
159 fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
161 if (ipv6_addr_any(&usin->sin6_addr)) {
165 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
166 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
169 usin->sin6_addr = in6addr_loopback;
172 addr_type = ipv6_addr_type(&usin->sin6_addr);
174 daddr = &usin->sin6_addr;
176 if (addr_type & IPV6_ADDR_MAPPED) {
177 struct sockaddr_in sin;
179 if (__ipv6_only_sock(sk)) {
183 sin.sin_family = AF_INET;
184 sin.sin_addr.s_addr = daddr->s6_addr32[3];
185 sin.sin_port = usin->sin6_port;
187 err = __ip4_datagram_connect(sk,
188 (struct sockaddr *) &sin,
195 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
197 if (ipv6_addr_any(&np->saddr) ||
198 ipv6_mapped_addr_any(&np->saddr))
199 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
201 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
202 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
203 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
204 &sk->sk_v6_rcv_saddr);
205 if (sk->sk_prot->rehash)
206 sk->sk_prot->rehash(sk);
212 if (__ipv6_addr_needs_scope_id(addr_type)) {
213 if (addr_len >= sizeof(struct sockaddr_in6) &&
214 usin->sin6_scope_id) {
215 if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id)) {
219 sk->sk_bound_dev_if = usin->sin6_scope_id;
222 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
223 sk->sk_bound_dev_if = np->mcast_oif;
225 /* Connect to link-local address requires an interface */
226 if (!sk->sk_bound_dev_if) {
232 /* save the current peer information before updating it */
233 old_daddr = sk->sk_v6_daddr;
234 old_fl6_flowlabel = np->flow_label;
235 old_dport = inet->inet_dport;
237 sk->sk_v6_daddr = *daddr;
238 np->flow_label = fl6_flowlabel;
239 inet->inet_dport = usin->sin6_port;
242 * Check for a route to destination an obtain the
243 * destination cache for it.
246 err = ip6_datagram_dst_update(sk, true);
248 /* Restore the socket peer info, to keep it consistent with
249 * the old socket state
251 sk->sk_v6_daddr = old_daddr;
252 np->flow_label = old_fl6_flowlabel;
253 inet->inet_dport = old_dport;
257 sk->sk_state = TCP_ESTABLISHED;
262 EXPORT_SYMBOL_GPL(__ip6_datagram_connect);
264 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
269 res = __ip6_datagram_connect(sk, uaddr, addr_len);
273 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
275 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
278 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
279 if (sin6->sin6_family != AF_INET6)
280 return -EAFNOSUPPORT;
281 return ip6_datagram_connect(sk, uaddr, addr_len);
283 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
285 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
286 __be16 port, u32 info, u8 *payload)
288 struct ipv6_pinfo *np = inet6_sk(sk);
289 struct icmp6hdr *icmph = icmp6_hdr(skb);
290 struct sock_exterr_skb *serr;
295 skb = skb_clone(skb, GFP_ATOMIC);
299 skb->protocol = htons(ETH_P_IPV6);
301 serr = SKB_EXT_ERR(skb);
302 serr->ee.ee_errno = err;
303 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
304 serr->ee.ee_type = icmph->icmp6_type;
305 serr->ee.ee_code = icmph->icmp6_code;
307 serr->ee.ee_info = info;
308 serr->ee.ee_data = 0;
309 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
310 skb_network_header(skb);
313 __skb_pull(skb, payload - skb->data);
314 skb_reset_transport_header(skb);
316 if (sock_queue_err_skb(sk, skb))
320 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
322 const struct ipv6_pinfo *np = inet6_sk(sk);
323 struct sock_exterr_skb *serr;
330 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
334 skb->protocol = htons(ETH_P_IPV6);
336 skb_put(skb, sizeof(struct ipv6hdr));
337 skb_reset_network_header(skb);
339 iph->daddr = fl6->daddr;
340 ip6_flow_hdr(iph, 0, 0);
342 serr = SKB_EXT_ERR(skb);
343 serr->ee.ee_errno = err;
344 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
345 serr->ee.ee_type = 0;
346 serr->ee.ee_code = 0;
348 serr->ee.ee_info = info;
349 serr->ee.ee_data = 0;
350 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
351 serr->port = fl6->fl6_dport;
353 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
354 skb_reset_transport_header(skb);
356 if (sock_queue_err_skb(sk, skb))
360 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
362 struct ipv6_pinfo *np = inet6_sk(sk);
365 struct ip6_mtuinfo *mtu_info;
367 if (!np->rxopt.bits.rxpmtu)
370 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
374 skb_put(skb, sizeof(struct ipv6hdr));
375 skb_reset_network_header(skb);
377 iph->daddr = fl6->daddr;
379 mtu_info = IP6CBMTU(skb);
381 mtu_info->ip6m_mtu = mtu;
382 mtu_info->ip6m_addr.sin6_family = AF_INET6;
383 mtu_info->ip6m_addr.sin6_port = 0;
384 mtu_info->ip6m_addr.sin6_flowinfo = 0;
385 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
386 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
388 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
389 skb_reset_transport_header(skb);
391 skb = xchg(&np->rxpmtu, skb);
395 /* For some errors we have valid addr_offset even with zero payload and
396 * zero port. Also, addr_offset should be supported if port is set.
398 static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
400 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
401 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
402 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
405 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
407 * At one point, excluding local errors was a quick test to identify icmp/icmp6
408 * errors. This is no longer true, but the test remained, so the v6 stack,
409 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
411 static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
412 struct sock_exterr_skb *serr)
414 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
415 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
418 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
421 if (!IP6CB(skb)->iif)
428 * Handle MSG_ERRQUEUE
430 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
432 struct ipv6_pinfo *np = inet6_sk(sk);
433 struct sock_exterr_skb *serr;
435 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
437 struct sock_extended_err ee;
438 struct sockaddr_in6 offender;
444 skb = sock_dequeue_err_skb(sk);
450 msg->msg_flags |= MSG_TRUNC;
453 err = skb_copy_datagram_msg(skb, 0, msg, copied);
458 sock_recv_timestamp(msg, sk, skb);
460 serr = SKB_EXT_ERR(skb);
462 if (sin && ipv6_datagram_support_addr(serr)) {
463 const unsigned char *nh = skb_network_header(skb);
464 sin->sin6_family = AF_INET6;
465 sin->sin6_flowinfo = 0;
466 sin->sin6_port = serr->port;
467 if (skb->protocol == htons(ETH_P_IPV6)) {
468 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
469 struct ipv6hdr, daddr);
470 sin->sin6_addr = ip6h->daddr;
472 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
474 ipv6_iface_scope_id(&sin->sin6_addr,
477 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
479 sin->sin6_scope_id = 0;
481 *addr_len = sizeof(*sin);
484 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
485 sin = &errhdr.offender;
486 memset(sin, 0, sizeof(*sin));
488 if (ip6_datagram_support_cmsg(skb, serr)) {
489 sin->sin6_family = AF_INET6;
491 ip6_datagram_recv_common_ctl(sk, msg, skb);
492 if (skb->protocol == htons(ETH_P_IPV6)) {
493 sin->sin6_addr = ipv6_hdr(skb)->saddr;
495 ip6_datagram_recv_specific_ctl(sk, msg, skb);
497 ipv6_iface_scope_id(&sin->sin6_addr,
500 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
502 if (inet_sk(sk)->cmsg_flags)
503 ip_cmsg_recv(msg, skb);
507 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
509 /* Now we could try to dump offended packet options */
511 msg->msg_flags |= MSG_ERRQUEUE;
518 EXPORT_SYMBOL_GPL(ipv6_recv_error);
521 * Handle IPV6_RECVPATHMTU
523 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
526 struct ipv6_pinfo *np = inet6_sk(sk);
528 struct ip6_mtuinfo mtu_info;
529 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
534 skb = xchg(&np->rxpmtu, NULL);
540 msg->msg_flags |= MSG_TRUNC;
543 err = skb_copy_datagram_msg(skb, 0, msg, copied);
547 sock_recv_timestamp(msg, sk, skb);
549 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
552 sin->sin6_family = AF_INET6;
553 sin->sin6_flowinfo = 0;
555 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
556 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
557 *addr_len = sizeof(*sin);
560 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
571 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
574 struct ipv6_pinfo *np = inet6_sk(sk);
575 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
577 if (np->rxopt.bits.rxinfo) {
578 struct in6_pktinfo src_info;
581 src_info.ipi6_ifindex = IP6CB(skb)->iif;
582 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
584 src_info.ipi6_ifindex =
585 PKTINFO_SKB_CB(skb)->ipi_ifindex;
586 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
587 &src_info.ipi6_addr);
590 if (src_info.ipi6_ifindex >= 0)
591 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
592 sizeof(src_info), &src_info);
596 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
599 struct ipv6_pinfo *np = inet6_sk(sk);
600 struct inet6_skb_parm *opt = IP6CB(skb);
601 unsigned char *nh = skb_network_header(skb);
603 if (np->rxopt.bits.rxhlim) {
604 int hlim = ipv6_hdr(skb)->hop_limit;
605 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
608 if (np->rxopt.bits.rxtclass) {
609 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
610 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
613 if (np->rxopt.bits.rxflow) {
614 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
616 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
619 /* HbH is allowed only once */
620 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
621 u8 *ptr = nh + sizeof(struct ipv6hdr);
622 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
626 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
628 * Silly enough, but we need to reparse in order to
629 * report extension headers (except for HbH)
632 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
633 * (and WILL NOT be) defined because
634 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
636 unsigned int off = sizeof(struct ipv6hdr);
637 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
639 while (off <= opt->lastopt) {
644 case IPPROTO_DSTOPTS:
646 len = (ptr[1] + 1) << 3;
647 if (np->rxopt.bits.dstopts)
648 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
650 case IPPROTO_ROUTING:
652 len = (ptr[1] + 1) << 3;
653 if (np->rxopt.bits.srcrt)
654 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
658 len = (ptr[1] + 2) << 2;
662 len = (ptr[1] + 1) << 3;
670 /* socket options in old style */
671 if (np->rxopt.bits.rxoinfo) {
672 struct in6_pktinfo src_info;
674 src_info.ipi6_ifindex = opt->iif;
675 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
676 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
678 if (np->rxopt.bits.rxohlim) {
679 int hlim = ipv6_hdr(skb)->hop_limit;
680 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
682 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
683 u8 *ptr = nh + sizeof(struct ipv6hdr);
684 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
686 if (np->rxopt.bits.odstopts && opt->dst0) {
687 u8 *ptr = nh + opt->dst0;
688 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
690 if (np->rxopt.bits.osrcrt && opt->srcrt) {
691 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
692 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
694 if (np->rxopt.bits.odstopts && opt->dst1) {
695 u8 *ptr = nh + opt->dst1;
696 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
698 if (np->rxopt.bits.rxorigdstaddr) {
699 struct sockaddr_in6 sin6;
700 __be16 _ports[2], *ports;
702 ports = skb_header_pointer(skb, skb_transport_offset(skb),
703 sizeof(_ports), &_ports);
705 /* All current transport protocols have the port numbers in the
706 * first four bytes of the transport header and this function is
707 * written with this assumption in mind.
709 sin6.sin6_family = AF_INET6;
710 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
711 sin6.sin6_port = ports[1];
712 sin6.sin6_flowinfo = 0;
714 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
717 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
720 if (np->rxopt.bits.recvfragsize && opt->frag_max_size) {
721 int val = opt->frag_max_size;
723 put_cmsg(msg, SOL_IPV6, IPV6_RECVFRAGSIZE, sizeof(val), &val);
727 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
730 ip6_datagram_recv_common_ctl(sk, msg, skb);
731 ip6_datagram_recv_specific_ctl(sk, msg, skb);
733 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
735 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
736 struct msghdr *msg, struct flowi6 *fl6,
737 struct ipcm6_cookie *ipc6)
739 struct in6_pktinfo *src_info;
740 struct cmsghdr *cmsg;
741 struct ipv6_rt_hdr *rthdr;
742 struct ipv6_opt_hdr *hdr;
743 struct ipv6_txoptions *opt = ipc6->opt;
747 for_each_cmsghdr(cmsg, msg) {
750 if (!CMSG_OK(msg, cmsg)) {
755 if (cmsg->cmsg_level == SOL_SOCKET) {
756 err = __sock_cmsg_send(sk, msg, cmsg, &ipc6->sockc);
762 if (cmsg->cmsg_level != SOL_IPV6)
765 switch (cmsg->cmsg_type) {
767 case IPV6_2292PKTINFO:
769 struct net_device *dev = NULL;
772 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
777 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
778 src_idx = src_info->ipi6_ifindex;
781 if (fl6->flowi6_oif &&
782 src_idx != fl6->flowi6_oif &&
783 (sk->sk_bound_dev_if != fl6->flowi6_oif ||
784 !sk_dev_equal_l3scope(sk, src_idx)))
786 fl6->flowi6_oif = src_idx;
789 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
792 if (fl6->flowi6_oif) {
793 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
798 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
803 if (addr_type != IPV6_ADDR_ANY) {
804 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
805 if (!ipv6_can_nonlocal_bind(net, inet_sk(sk)) &&
806 !ipv6_chk_addr_and_flags(net, &src_info->ipi6_addr,
809 !ipv6_chk_acast_addr_src(net, dev,
810 &src_info->ipi6_addr))
813 fl6->saddr = src_info->ipi6_addr;
825 if (cmsg->cmsg_len < CMSG_LEN(4)) {
830 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
831 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
836 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
839 case IPV6_2292HOPOPTS:
841 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
846 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
847 len = ((hdr->hdrlen + 1) << 3);
848 if (cmsg->cmsg_len < CMSG_LEN(len)) {
852 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
856 opt->opt_nflen += len;
860 case IPV6_2292DSTOPTS:
861 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
866 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
867 len = ((hdr->hdrlen + 1) << 3);
868 if (cmsg->cmsg_len < CMSG_LEN(len)) {
872 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
880 opt->opt_flen += len;
885 case IPV6_RTHDRDSTOPTS:
886 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
891 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
892 len = ((hdr->hdrlen + 1) << 3);
893 if (cmsg->cmsg_len < CMSG_LEN(len)) {
897 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
901 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
902 opt->opt_flen += len;
905 opt->opt_nflen += len;
912 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
917 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
919 switch (rthdr->type) {
920 #if IS_ENABLED(CONFIG_IPV6_MIP6)
921 case IPV6_SRCRT_TYPE_2:
922 if (rthdr->hdrlen != 2 ||
923 rthdr->segments_left != 1) {
934 len = ((rthdr->hdrlen + 1) << 3);
936 if (cmsg->cmsg_len < CMSG_LEN(len)) {
941 /* segments left must also match */
942 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
947 opt->opt_nflen += len;
950 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
951 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
953 opt->opt_nflen += dsthdrlen;
954 opt->dst0opt = opt->dst1opt;
956 opt->opt_flen -= dsthdrlen;
961 case IPV6_2292HOPLIMIT:
963 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
968 ipc6->hlimit = *(int *)CMSG_DATA(cmsg);
969 if (ipc6->hlimit < -1 || ipc6->hlimit > 0xff) {
981 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
984 tc = *(int *)CMSG_DATA(cmsg);
985 if (tc < -1 || tc > 0xff)
999 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
1002 df = *(int *)CMSG_DATA(cmsg);
1003 if (df < 0 || df > 1)
1007 ipc6->dontfrag = df;
1012 net_dbg_ratelimited("invalid cmsg type: %d\n",
1022 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
1024 void __ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
1025 __u16 srcp, __u16 destp, int rqueue, int bucket)
1027 const struct in6_addr *dest, *src;
1029 dest = &sp->sk_v6_daddr;
1030 src = &sp->sk_v6_rcv_saddr;
1032 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1033 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
1035 src->s6_addr32[0], src->s6_addr32[1],
1036 src->s6_addr32[2], src->s6_addr32[3], srcp,
1037 dest->s6_addr32[0], dest->s6_addr32[1],
1038 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1040 sk_wmem_alloc_get(sp),
1043 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1046 refcount_read(&sp->sk_refcnt), sp,
1047 atomic_read(&sp->sk_drops));