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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * common UDP/RAW code
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 */
9
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>
23
24#include <net/ipv6.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>
32
33#include <linux/errqueue.h>
34#include <linux/uaccess.h>
35
36static bool ipv6_mapped_addr_any(const struct in6_addr *a)
37{
38 return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0);
39}
40
41static void ip6_datagram_flow_key_init(struct flowi6 *fl6, struct sock *sk)
42{
43 struct inet_sock *inet = inet_sk(sk);
44 struct ipv6_pinfo *np = inet6_sk(sk);
45
46 memset(fl6, 0, sizeof(*fl6));
47 fl6->flowi6_proto = sk->sk_protocol;
48 fl6->daddr = sk->sk_v6_daddr;
49 fl6->saddr = np->saddr;
50 fl6->flowi6_oif = sk->sk_bound_dev_if;
51 fl6->flowi6_mark = sk->sk_mark;
52 fl6->fl6_dport = inet->inet_dport;
53 fl6->fl6_sport = inet->inet_sport;
54 fl6->flowlabel = np->flow_label;
55 fl6->flowi6_uid = sk->sk_uid;
56
57 if (!fl6->flowi6_oif)
58 fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
59
60 if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr))
61 fl6->flowi6_oif = np->mcast_oif;
62
63 security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
64}
65
66int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr)
67{
68 struct ip6_flowlabel *flowlabel = NULL;
69 struct in6_addr *final_p, final;
70 struct ipv6_txoptions *opt;
71 struct dst_entry *dst;
72 struct inet_sock *inet = inet_sk(sk);
73 struct ipv6_pinfo *np = inet6_sk(sk);
74 struct flowi6 fl6;
75 int err = 0;
76
77 if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) {
78 flowlabel = fl6_sock_lookup(sk, np->flow_label);
79 if (IS_ERR(flowlabel))
80 return -EINVAL;
81 }
82 ip6_datagram_flow_key_init(&fl6, sk);
83
84 rcu_read_lock();
85 opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt);
86 final_p = fl6_update_dst(&fl6, opt, &final);
87 rcu_read_unlock();
88
89 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
90 if (IS_ERR(dst)) {
91 err = PTR_ERR(dst);
92 goto out;
93 }
94
95 if (fix_sk_saddr) {
96 if (ipv6_addr_any(&np->saddr))
97 np->saddr = fl6.saddr;
98
99 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
100 sk->sk_v6_rcv_saddr = fl6.saddr;
101 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
102 if (sk->sk_prot->rehash)
103 sk->sk_prot->rehash(sk);
104 }
105 }
106
107 ip6_sk_dst_store_flow(sk, dst, &fl6);
108
109out:
110 fl6_sock_release(flowlabel);
111 return err;
112}
113
114void ip6_datagram_release_cb(struct sock *sk)
115{
116 struct dst_entry *dst;
117
118 if (ipv6_addr_v4mapped(&sk->sk_v6_daddr))
119 return;
120
121 rcu_read_lock();
122 dst = __sk_dst_get(sk);
123 if (!dst || !dst->obsolete ||
124 dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) {
125 rcu_read_unlock();
126 return;
127 }
128 rcu_read_unlock();
129
130 ip6_datagram_dst_update(sk, false);
131}
132EXPORT_SYMBOL_GPL(ip6_datagram_release_cb);
133
134int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr,
135 int addr_len)
136{
137 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
138 struct inet_sock *inet = inet_sk(sk);
139 struct ipv6_pinfo *np = inet6_sk(sk);
140 struct in6_addr *daddr, old_daddr;
141 __be32 fl6_flowlabel = 0;
142 __be32 old_fl6_flowlabel;
143 __be16 old_dport;
144 int addr_type;
145 int err;
146
147 if (usin->sin6_family == AF_INET) {
148 if (__ipv6_only_sock(sk))
149 return -EAFNOSUPPORT;
150 err = __ip4_datagram_connect(sk, uaddr, addr_len);
151 goto ipv4_connected;
152 }
153
154 if (addr_len < SIN6_LEN_RFC2133)
155 return -EINVAL;
156
157 if (usin->sin6_family != AF_INET6)
158 return -EAFNOSUPPORT;
159
160 if (np->sndflow)
161 fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
162
163 if (ipv6_addr_any(&usin->sin6_addr)) {
164 /*
165 * connect to self
166 */
167 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
168 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
169 &usin->sin6_addr);
170 else
171 usin->sin6_addr = in6addr_loopback;
172 }
173
174 addr_type = ipv6_addr_type(&usin->sin6_addr);
175
176 daddr = &usin->sin6_addr;
177
178 if (addr_type & IPV6_ADDR_MAPPED) {
179 struct sockaddr_in sin;
180
181 if (__ipv6_only_sock(sk)) {
182 err = -ENETUNREACH;
183 goto out;
184 }
185 sin.sin_family = AF_INET;
186 sin.sin_addr.s_addr = daddr->s6_addr32[3];
187 sin.sin_port = usin->sin6_port;
188
189 err = __ip4_datagram_connect(sk,
190 (struct sockaddr *) &sin,
191 sizeof(sin));
192
193ipv4_connected:
194 if (err)
195 goto out;
196
197 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
198
199 if (ipv6_addr_any(&np->saddr) ||
200 ipv6_mapped_addr_any(&np->saddr))
201 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
202
203 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
204 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
205 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
206 &sk->sk_v6_rcv_saddr);
207 if (sk->sk_prot->rehash)
208 sk->sk_prot->rehash(sk);
209 }
210
211 goto out;
212 }
213
214 if (__ipv6_addr_needs_scope_id(addr_type)) {
215 if (addr_len >= sizeof(struct sockaddr_in6) &&
216 usin->sin6_scope_id) {
217 if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id)) {
218 err = -EINVAL;
219 goto out;
220 }
221 sk->sk_bound_dev_if = usin->sin6_scope_id;
222 }
223
224 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
225 sk->sk_bound_dev_if = np->mcast_oif;
226
227 /* Connect to link-local address requires an interface */
228 if (!sk->sk_bound_dev_if) {
229 err = -EINVAL;
230 goto out;
231 }
232 }
233
234 /* save the current peer information before updating it */
235 old_daddr = sk->sk_v6_daddr;
236 old_fl6_flowlabel = np->flow_label;
237 old_dport = inet->inet_dport;
238
239 sk->sk_v6_daddr = *daddr;
240 np->flow_label = fl6_flowlabel;
241 inet->inet_dport = usin->sin6_port;
242
243 /*
244 * Check for a route to destination an obtain the
245 * destination cache for it.
246 */
247
248 err = ip6_datagram_dst_update(sk, true);
249 if (err) {
250 /* Restore the socket peer info, to keep it consistent with
251 * the old socket state
252 */
253 sk->sk_v6_daddr = old_daddr;
254 np->flow_label = old_fl6_flowlabel;
255 inet->inet_dport = old_dport;
256 goto out;
257 }
258
259 reuseport_has_conns(sk, true);
260 sk->sk_state = TCP_ESTABLISHED;
261 sk_set_txhash(sk);
262out:
263 return err;
264}
265EXPORT_SYMBOL_GPL(__ip6_datagram_connect);
266
267int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
268{
269 int res;
270
271 lock_sock(sk);
272 res = __ip6_datagram_connect(sk, uaddr, addr_len);
273 release_sock(sk);
274 return res;
275}
276EXPORT_SYMBOL_GPL(ip6_datagram_connect);
277
278int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
279 int addr_len)
280{
281 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
282 if (sin6->sin6_family != AF_INET6)
283 return -EAFNOSUPPORT;
284 return ip6_datagram_connect(sk, uaddr, addr_len);
285}
286EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
287
288static void ipv6_icmp_error_rfc4884(const struct sk_buff *skb,
289 struct sock_ee_data_rfc4884 *out)
290{
291 switch (icmp6_hdr(skb)->icmp6_type) {
292 case ICMPV6_TIME_EXCEED:
293 case ICMPV6_DEST_UNREACH:
294 ip_icmp_error_rfc4884(skb, out, sizeof(struct icmp6hdr),
295 icmp6_hdr(skb)->icmp6_datagram_len * 8);
296 }
297}
298
299void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
300 __be16 port, u32 info, u8 *payload)
301{
302 struct ipv6_pinfo *np = inet6_sk(sk);
303 struct icmp6hdr *icmph = icmp6_hdr(skb);
304 struct sock_exterr_skb *serr;
305
306 if (!np->recverr)
307 return;
308
309 skb = skb_clone(skb, GFP_ATOMIC);
310 if (!skb)
311 return;
312
313 skb->protocol = htons(ETH_P_IPV6);
314
315 serr = SKB_EXT_ERR(skb);
316 serr->ee.ee_errno = err;
317 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
318 serr->ee.ee_type = icmph->icmp6_type;
319 serr->ee.ee_code = icmph->icmp6_code;
320 serr->ee.ee_pad = 0;
321 serr->ee.ee_info = info;
322 serr->ee.ee_data = 0;
323 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
324 skb_network_header(skb);
325 serr->port = port;
326
327 __skb_pull(skb, payload - skb->data);
328
329 if (inet6_sk(sk)->recverr_rfc4884)
330 ipv6_icmp_error_rfc4884(skb, &serr->ee.ee_rfc4884);
331
332 skb_reset_transport_header(skb);
333
334 if (sock_queue_err_skb(sk, skb))
335 kfree_skb(skb);
336}
337
338void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
339{
340 const struct ipv6_pinfo *np = inet6_sk(sk);
341 struct sock_exterr_skb *serr;
342 struct ipv6hdr *iph;
343 struct sk_buff *skb;
344
345 if (!np->recverr)
346 return;
347
348 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
349 if (!skb)
350 return;
351
352 skb->protocol = htons(ETH_P_IPV6);
353
354 skb_put(skb, sizeof(struct ipv6hdr));
355 skb_reset_network_header(skb);
356 iph = ipv6_hdr(skb);
357 iph->daddr = fl6->daddr;
358 ip6_flow_hdr(iph, 0, 0);
359
360 serr = SKB_EXT_ERR(skb);
361 serr->ee.ee_errno = err;
362 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
363 serr->ee.ee_type = 0;
364 serr->ee.ee_code = 0;
365 serr->ee.ee_pad = 0;
366 serr->ee.ee_info = info;
367 serr->ee.ee_data = 0;
368 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
369 serr->port = fl6->fl6_dport;
370
371 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
372 skb_reset_transport_header(skb);
373
374 if (sock_queue_err_skb(sk, skb))
375 kfree_skb(skb);
376}
377
378void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
379{
380 struct ipv6_pinfo *np = inet6_sk(sk);
381 struct ipv6hdr *iph;
382 struct sk_buff *skb;
383 struct ip6_mtuinfo *mtu_info;
384
385 if (!np->rxopt.bits.rxpmtu)
386 return;
387
388 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
389 if (!skb)
390 return;
391
392 skb_put(skb, sizeof(struct ipv6hdr));
393 skb_reset_network_header(skb);
394 iph = ipv6_hdr(skb);
395 iph->daddr = fl6->daddr;
396
397 mtu_info = IP6CBMTU(skb);
398
399 mtu_info->ip6m_mtu = mtu;
400 mtu_info->ip6m_addr.sin6_family = AF_INET6;
401 mtu_info->ip6m_addr.sin6_port = 0;
402 mtu_info->ip6m_addr.sin6_flowinfo = 0;
403 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
404 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
405
406 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
407 skb_reset_transport_header(skb);
408
409 skb = xchg(&np->rxpmtu, skb);
410 kfree_skb(skb);
411}
412
413/* For some errors we have valid addr_offset even with zero payload and
414 * zero port. Also, addr_offset should be supported if port is set.
415 */
416static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
417{
418 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
419 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
420 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
421}
422
423/* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
424 *
425 * At one point, excluding local errors was a quick test to identify icmp/icmp6
426 * errors. This is no longer true, but the test remained, so the v6 stack,
427 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
428 */
429static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
430 struct sock_exterr_skb *serr)
431{
432 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
433 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
434 return true;
435
436 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
437 return false;
438
439 if (!IP6CB(skb)->iif)
440 return false;
441
442 return true;
443}
444
445/*
446 * Handle MSG_ERRQUEUE
447 */
448int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
449{
450 struct ipv6_pinfo *np = inet6_sk(sk);
451 struct sock_exterr_skb *serr;
452 struct sk_buff *skb;
453 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
454 struct {
455 struct sock_extended_err ee;
456 struct sockaddr_in6 offender;
457 } errhdr;
458 int err;
459 int copied;
460
461 err = -EAGAIN;
462 skb = sock_dequeue_err_skb(sk);
463 if (!skb)
464 goto out;
465
466 copied = skb->len;
467 if (copied > len) {
468 msg->msg_flags |= MSG_TRUNC;
469 copied = len;
470 }
471 err = skb_copy_datagram_msg(skb, 0, msg, copied);
472 if (unlikely(err)) {
473 kfree_skb(skb);
474 return err;
475 }
476 sock_recv_timestamp(msg, sk, skb);
477
478 serr = SKB_EXT_ERR(skb);
479
480 if (sin && ipv6_datagram_support_addr(serr)) {
481 const unsigned char *nh = skb_network_header(skb);
482 sin->sin6_family = AF_INET6;
483 sin->sin6_flowinfo = 0;
484 sin->sin6_port = serr->port;
485 if (skb->protocol == htons(ETH_P_IPV6)) {
486 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
487 struct ipv6hdr, daddr);
488 sin->sin6_addr = ip6h->daddr;
489 if (np->sndflow)
490 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
491 sin->sin6_scope_id =
492 ipv6_iface_scope_id(&sin->sin6_addr,
493 IP6CB(skb)->iif);
494 } else {
495 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
496 &sin->sin6_addr);
497 sin->sin6_scope_id = 0;
498 }
499 *addr_len = sizeof(*sin);
500 }
501
502 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
503 sin = &errhdr.offender;
504 memset(sin, 0, sizeof(*sin));
505
506 if (ip6_datagram_support_cmsg(skb, serr)) {
507 sin->sin6_family = AF_INET6;
508 if (np->rxopt.all)
509 ip6_datagram_recv_common_ctl(sk, msg, skb);
510 if (skb->protocol == htons(ETH_P_IPV6)) {
511 sin->sin6_addr = ipv6_hdr(skb)->saddr;
512 if (np->rxopt.all)
513 ip6_datagram_recv_specific_ctl(sk, msg, skb);
514 sin->sin6_scope_id =
515 ipv6_iface_scope_id(&sin->sin6_addr,
516 IP6CB(skb)->iif);
517 } else {
518 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
519 &sin->sin6_addr);
520 if (inet_sk(sk)->cmsg_flags)
521 ip_cmsg_recv(msg, skb);
522 }
523 }
524
525 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
526
527 /* Now we could try to dump offended packet options */
528
529 msg->msg_flags |= MSG_ERRQUEUE;
530 err = copied;
531
532 consume_skb(skb);
533out:
534 return err;
535}
536EXPORT_SYMBOL_GPL(ipv6_recv_error);
537
538/*
539 * Handle IPV6_RECVPATHMTU
540 */
541int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
542 int *addr_len)
543{
544 struct ipv6_pinfo *np = inet6_sk(sk);
545 struct sk_buff *skb;
546 struct ip6_mtuinfo mtu_info;
547 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
548 int err;
549 int copied;
550
551 err = -EAGAIN;
552 skb = xchg(&np->rxpmtu, NULL);
553 if (!skb)
554 goto out;
555
556 copied = skb->len;
557 if (copied > len) {
558 msg->msg_flags |= MSG_TRUNC;
559 copied = len;
560 }
561 err = skb_copy_datagram_msg(skb, 0, msg, copied);
562 if (err)
563 goto out_free_skb;
564
565 sock_recv_timestamp(msg, sk, skb);
566
567 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
568
569 if (sin) {
570 sin->sin6_family = AF_INET6;
571 sin->sin6_flowinfo = 0;
572 sin->sin6_port = 0;
573 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
574 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
575 *addr_len = sizeof(*sin);
576 }
577
578 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
579
580 err = copied;
581
582out_free_skb:
583 kfree_skb(skb);
584out:
585 return err;
586}
587
588
589void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
590 struct sk_buff *skb)
591{
592 struct ipv6_pinfo *np = inet6_sk(sk);
593 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
594
595 if (np->rxopt.bits.rxinfo) {
596 struct in6_pktinfo src_info;
597
598 if (is_ipv6) {
599 src_info.ipi6_ifindex = IP6CB(skb)->iif;
600 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
601 } else {
602 src_info.ipi6_ifindex =
603 PKTINFO_SKB_CB(skb)->ipi_ifindex;
604 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
605 &src_info.ipi6_addr);
606 }
607
608 if (src_info.ipi6_ifindex >= 0)
609 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
610 sizeof(src_info), &src_info);
611 }
612}
613
614void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
615 struct sk_buff *skb)
616{
617 struct ipv6_pinfo *np = inet6_sk(sk);
618 struct inet6_skb_parm *opt = IP6CB(skb);
619 unsigned char *nh = skb_network_header(skb);
620
621 if (np->rxopt.bits.rxhlim) {
622 int hlim = ipv6_hdr(skb)->hop_limit;
623 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
624 }
625
626 if (np->rxopt.bits.rxtclass) {
627 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
628 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
629 }
630
631 if (np->rxopt.bits.rxflow) {
632 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
633 if (flowinfo)
634 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
635 }
636
637 /* HbH is allowed only once */
638 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
639 u8 *ptr = nh + sizeof(struct ipv6hdr);
640 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
641 }
642
643 if (opt->lastopt &&
644 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
645 /*
646 * Silly enough, but we need to reparse in order to
647 * report extension headers (except for HbH)
648 * in order.
649 *
650 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
651 * (and WILL NOT be) defined because
652 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
653 */
654 unsigned int off = sizeof(struct ipv6hdr);
655 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
656
657 while (off <= opt->lastopt) {
658 unsigned int len;
659 u8 *ptr = nh + off;
660
661 switch (nexthdr) {
662 case IPPROTO_DSTOPTS:
663 nexthdr = ptr[0];
664 len = (ptr[1] + 1) << 3;
665 if (np->rxopt.bits.dstopts)
666 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
667 break;
668 case IPPROTO_ROUTING:
669 nexthdr = ptr[0];
670 len = (ptr[1] + 1) << 3;
671 if (np->rxopt.bits.srcrt)
672 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
673 break;
674 case IPPROTO_AH:
675 nexthdr = ptr[0];
676 len = (ptr[1] + 2) << 2;
677 break;
678 default:
679 nexthdr = ptr[0];
680 len = (ptr[1] + 1) << 3;
681 break;
682 }
683
684 off += len;
685 }
686 }
687
688 /* socket options in old style */
689 if (np->rxopt.bits.rxoinfo) {
690 struct in6_pktinfo src_info;
691
692 src_info.ipi6_ifindex = opt->iif;
693 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
694 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
695 }
696 if (np->rxopt.bits.rxohlim) {
697 int hlim = ipv6_hdr(skb)->hop_limit;
698 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
699 }
700 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
701 u8 *ptr = nh + sizeof(struct ipv6hdr);
702 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
703 }
704 if (np->rxopt.bits.odstopts && opt->dst0) {
705 u8 *ptr = nh + opt->dst0;
706 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
707 }
708 if (np->rxopt.bits.osrcrt && opt->srcrt) {
709 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
710 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
711 }
712 if (np->rxopt.bits.odstopts && opt->dst1) {
713 u8 *ptr = nh + opt->dst1;
714 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
715 }
716 if (np->rxopt.bits.rxorigdstaddr) {
717 struct sockaddr_in6 sin6;
718 __be16 _ports[2], *ports;
719
720 ports = skb_header_pointer(skb, skb_transport_offset(skb),
721 sizeof(_ports), &_ports);
722 if (ports) {
723 /* All current transport protocols have the port numbers in the
724 * first four bytes of the transport header and this function is
725 * written with this assumption in mind.
726 */
727 sin6.sin6_family = AF_INET6;
728 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
729 sin6.sin6_port = ports[1];
730 sin6.sin6_flowinfo = 0;
731 sin6.sin6_scope_id =
732 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
733 opt->iif);
734
735 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
736 }
737 }
738 if (np->rxopt.bits.recvfragsize && opt->frag_max_size) {
739 int val = opt->frag_max_size;
740
741 put_cmsg(msg, SOL_IPV6, IPV6_RECVFRAGSIZE, sizeof(val), &val);
742 }
743}
744
745void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
746 struct sk_buff *skb)
747{
748 ip6_datagram_recv_common_ctl(sk, msg, skb);
749 ip6_datagram_recv_specific_ctl(sk, msg, skb);
750}
751EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
752
753int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
754 struct msghdr *msg, struct flowi6 *fl6,
755 struct ipcm6_cookie *ipc6)
756{
757 struct in6_pktinfo *src_info;
758 struct cmsghdr *cmsg;
759 struct ipv6_rt_hdr *rthdr;
760 struct ipv6_opt_hdr *hdr;
761 struct ipv6_txoptions *opt = ipc6->opt;
762 int len;
763 int err = 0;
764
765 for_each_cmsghdr(cmsg, msg) {
766 int addr_type;
767
768 if (!CMSG_OK(msg, cmsg)) {
769 err = -EINVAL;
770 goto exit_f;
771 }
772
773 if (cmsg->cmsg_level == SOL_SOCKET) {
774 err = __sock_cmsg_send(sk, msg, cmsg, &ipc6->sockc);
775 if (err)
776 return err;
777 continue;
778 }
779
780 if (cmsg->cmsg_level != SOL_IPV6)
781 continue;
782
783 switch (cmsg->cmsg_type) {
784 case IPV6_PKTINFO:
785 case IPV6_2292PKTINFO:
786 {
787 struct net_device *dev = NULL;
788 int src_idx;
789
790 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
791 err = -EINVAL;
792 goto exit_f;
793 }
794
795 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
796 src_idx = src_info->ipi6_ifindex;
797
798 if (src_idx) {
799 if (fl6->flowi6_oif &&
800 src_idx != fl6->flowi6_oif &&
801 (sk->sk_bound_dev_if != fl6->flowi6_oif ||
802 !sk_dev_equal_l3scope(sk, src_idx)))
803 return -EINVAL;
804 fl6->flowi6_oif = src_idx;
805 }
806
807 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
808
809 rcu_read_lock();
810 if (fl6->flowi6_oif) {
811 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
812 if (!dev) {
813 rcu_read_unlock();
814 return -ENODEV;
815 }
816 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
817 rcu_read_unlock();
818 return -EINVAL;
819 }
820
821 if (addr_type != IPV6_ADDR_ANY) {
822 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
823 if (!ipv6_can_nonlocal_bind(net, inet_sk(sk)) &&
824 !ipv6_chk_addr_and_flags(net, &src_info->ipi6_addr,
825 dev, !strict, 0,
826 IFA_F_TENTATIVE) &&
827 !ipv6_chk_acast_addr_src(net, dev,
828 &src_info->ipi6_addr))
829 err = -EINVAL;
830 else
831 fl6->saddr = src_info->ipi6_addr;
832 }
833
834 rcu_read_unlock();
835
836 if (err)
837 goto exit_f;
838
839 break;
840 }
841
842 case IPV6_FLOWINFO:
843 if (cmsg->cmsg_len < CMSG_LEN(4)) {
844 err = -EINVAL;
845 goto exit_f;
846 }
847
848 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
849 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
850 err = -EINVAL;
851 goto exit_f;
852 }
853 }
854 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
855 break;
856
857 case IPV6_2292HOPOPTS:
858 case IPV6_HOPOPTS:
859 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
860 err = -EINVAL;
861 goto exit_f;
862 }
863
864 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
865 len = ((hdr->hdrlen + 1) << 3);
866 if (cmsg->cmsg_len < CMSG_LEN(len)) {
867 err = -EINVAL;
868 goto exit_f;
869 }
870 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
871 err = -EPERM;
872 goto exit_f;
873 }
874 opt->opt_nflen += len;
875 opt->hopopt = hdr;
876 break;
877
878 case IPV6_2292DSTOPTS:
879 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
880 err = -EINVAL;
881 goto exit_f;
882 }
883
884 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
885 len = ((hdr->hdrlen + 1) << 3);
886 if (cmsg->cmsg_len < CMSG_LEN(len)) {
887 err = -EINVAL;
888 goto exit_f;
889 }
890 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
891 err = -EPERM;
892 goto exit_f;
893 }
894 if (opt->dst1opt) {
895 err = -EINVAL;
896 goto exit_f;
897 }
898 opt->opt_flen += len;
899 opt->dst1opt = hdr;
900 break;
901
902 case IPV6_DSTOPTS:
903 case IPV6_RTHDRDSTOPTS:
904 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
905 err = -EINVAL;
906 goto exit_f;
907 }
908
909 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
910 len = ((hdr->hdrlen + 1) << 3);
911 if (cmsg->cmsg_len < CMSG_LEN(len)) {
912 err = -EINVAL;
913 goto exit_f;
914 }
915 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
916 err = -EPERM;
917 goto exit_f;
918 }
919 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
920 opt->opt_flen += len;
921 opt->dst1opt = hdr;
922 } else {
923 opt->opt_nflen += len;
924 opt->dst0opt = hdr;
925 }
926 break;
927
928 case IPV6_2292RTHDR:
929 case IPV6_RTHDR:
930 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
931 err = -EINVAL;
932 goto exit_f;
933 }
934
935 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
936
937 switch (rthdr->type) {
938#if IS_ENABLED(CONFIG_IPV6_MIP6)
939 case IPV6_SRCRT_TYPE_2:
940 if (rthdr->hdrlen != 2 ||
941 rthdr->segments_left != 1) {
942 err = -EINVAL;
943 goto exit_f;
944 }
945 break;
946#endif
947 default:
948 err = -EINVAL;
949 goto exit_f;
950 }
951
952 len = ((rthdr->hdrlen + 1) << 3);
953
954 if (cmsg->cmsg_len < CMSG_LEN(len)) {
955 err = -EINVAL;
956 goto exit_f;
957 }
958
959 /* segments left must also match */
960 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
961 err = -EINVAL;
962 goto exit_f;
963 }
964
965 opt->opt_nflen += len;
966 opt->srcrt = rthdr;
967
968 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
969 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
970
971 opt->opt_nflen += dsthdrlen;
972 opt->dst0opt = opt->dst1opt;
973 opt->dst1opt = NULL;
974 opt->opt_flen -= dsthdrlen;
975 }
976
977 break;
978
979 case IPV6_2292HOPLIMIT:
980 case IPV6_HOPLIMIT:
981 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
982 err = -EINVAL;
983 goto exit_f;
984 }
985
986 ipc6->hlimit = *(int *)CMSG_DATA(cmsg);
987 if (ipc6->hlimit < -1 || ipc6->hlimit > 0xff) {
988 err = -EINVAL;
989 goto exit_f;
990 }
991
992 break;
993
994 case IPV6_TCLASS:
995 {
996 int tc;
997
998 err = -EINVAL;
999 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
1000 goto exit_f;
1001
1002 tc = *(int *)CMSG_DATA(cmsg);
1003 if (tc < -1 || tc > 0xff)
1004 goto exit_f;
1005
1006 err = 0;
1007 ipc6->tclass = tc;
1008
1009 break;
1010 }
1011
1012 case IPV6_DONTFRAG:
1013 {
1014 int df;
1015
1016 err = -EINVAL;
1017 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
1018 goto exit_f;
1019
1020 df = *(int *)CMSG_DATA(cmsg);
1021 if (df < 0 || df > 1)
1022 goto exit_f;
1023
1024 err = 0;
1025 ipc6->dontfrag = df;
1026
1027 break;
1028 }
1029 default:
1030 net_dbg_ratelimited("invalid cmsg type: %d\n",
1031 cmsg->cmsg_type);
1032 err = -EINVAL;
1033 goto exit_f;
1034 }
1035 }
1036
1037exit_f:
1038 return err;
1039}
1040EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
1041
1042void __ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
1043 __u16 srcp, __u16 destp, int rqueue, int bucket)
1044{
1045 const struct in6_addr *dest, *src;
1046
1047 dest = &sp->sk_v6_daddr;
1048 src = &sp->sk_v6_rcv_saddr;
1049 seq_printf(seq,
1050 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1051 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
1052 bucket,
1053 src->s6_addr32[0], src->s6_addr32[1],
1054 src->s6_addr32[2], src->s6_addr32[3], srcp,
1055 dest->s6_addr32[0], dest->s6_addr32[1],
1056 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1057 sp->sk_state,
1058 sk_wmem_alloc_get(sp),
1059 rqueue,
1060 0, 0L, 0,
1061 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1062 0,
1063 sock_i_ino(sp),
1064 refcount_read(&sp->sk_refcnt), sp,
1065 atomic_read(&sp->sk_drops));
1066}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * common UDP/RAW code
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 */
9
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>
23
24#include <net/ipv6.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>
32
33#include <linux/errqueue.h>
34#include <linux/uaccess.h>
35
36static bool ipv6_mapped_addr_any(const struct in6_addr *a)
37{
38 return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0);
39}
40
41static void ip6_datagram_flow_key_init(struct flowi6 *fl6,
42 const struct sock *sk)
43{
44 const struct inet_sock *inet = inet_sk(sk);
45 const struct ipv6_pinfo *np = inet6_sk(sk);
46 int oif = sk->sk_bound_dev_if;
47
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_mark = sk->sk_mark;
53 fl6->fl6_dport = inet->inet_dport;
54 fl6->fl6_sport = inet->inet_sport;
55 fl6->flowlabel = ip6_make_flowinfo(np->tclass, np->flow_label);
56 fl6->flowi6_uid = sk->sk_uid;
57
58 if (!oif)
59 oif = np->sticky_pktinfo.ipi6_ifindex;
60
61 if (!oif) {
62 if (ipv6_addr_is_multicast(&fl6->daddr))
63 oif = READ_ONCE(np->mcast_oif);
64 else
65 oif = READ_ONCE(np->ucast_oif);
66 }
67
68 fl6->flowi6_oif = oif;
69 security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6));
70}
71
72int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr)
73{
74 struct ip6_flowlabel *flowlabel = NULL;
75 struct in6_addr *final_p, final;
76 struct ipv6_txoptions *opt;
77 struct dst_entry *dst;
78 struct inet_sock *inet = inet_sk(sk);
79 struct ipv6_pinfo *np = inet6_sk(sk);
80 struct flowi6 fl6;
81 int err = 0;
82
83 if (inet6_test_bit(SNDFLOW, sk) &&
84 (np->flow_label & IPV6_FLOWLABEL_MASK)) {
85 flowlabel = fl6_sock_lookup(sk, np->flow_label);
86 if (IS_ERR(flowlabel))
87 return -EINVAL;
88 }
89 ip6_datagram_flow_key_init(&fl6, sk);
90
91 rcu_read_lock();
92 opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt);
93 final_p = fl6_update_dst(&fl6, opt, &final);
94 rcu_read_unlock();
95
96 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
97 if (IS_ERR(dst)) {
98 err = PTR_ERR(dst);
99 goto out;
100 }
101
102 if (fix_sk_saddr) {
103 if (ipv6_addr_any(&np->saddr))
104 np->saddr = fl6.saddr;
105
106 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
107 sk->sk_v6_rcv_saddr = fl6.saddr;
108 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
109 if (sk->sk_prot->rehash)
110 sk->sk_prot->rehash(sk);
111 }
112 }
113
114 ip6_sk_dst_store_flow(sk, dst, &fl6);
115
116out:
117 fl6_sock_release(flowlabel);
118 return err;
119}
120
121void ip6_datagram_release_cb(struct sock *sk)
122{
123 struct dst_entry *dst;
124
125 if (ipv6_addr_v4mapped(&sk->sk_v6_daddr))
126 return;
127
128 rcu_read_lock();
129 dst = __sk_dst_get(sk);
130 if (!dst || !dst->obsolete ||
131 dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) {
132 rcu_read_unlock();
133 return;
134 }
135 rcu_read_unlock();
136
137 ip6_datagram_dst_update(sk, false);
138}
139EXPORT_SYMBOL_GPL(ip6_datagram_release_cb);
140
141int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr,
142 int addr_len)
143{
144 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
145 struct inet_sock *inet = inet_sk(sk);
146 struct ipv6_pinfo *np = inet6_sk(sk);
147 struct in6_addr *daddr, old_daddr;
148 __be32 fl6_flowlabel = 0;
149 __be32 old_fl6_flowlabel;
150 __be16 old_dport;
151 int addr_type;
152 int err;
153
154 if (usin->sin6_family == AF_INET) {
155 if (ipv6_only_sock(sk))
156 return -EAFNOSUPPORT;
157 err = __ip4_datagram_connect(sk, uaddr, addr_len);
158 goto ipv4_connected;
159 }
160
161 if (addr_len < SIN6_LEN_RFC2133)
162 return -EINVAL;
163
164 if (usin->sin6_family != AF_INET6)
165 return -EAFNOSUPPORT;
166
167 if (inet6_test_bit(SNDFLOW, sk))
168 fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
169
170 if (ipv6_addr_any(&usin->sin6_addr)) {
171 /*
172 * connect to self
173 */
174 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
175 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
176 &usin->sin6_addr);
177 else
178 usin->sin6_addr = in6addr_loopback;
179 }
180
181 addr_type = ipv6_addr_type(&usin->sin6_addr);
182
183 daddr = &usin->sin6_addr;
184
185 if (addr_type & IPV6_ADDR_MAPPED) {
186 struct sockaddr_in sin;
187
188 if (ipv6_only_sock(sk)) {
189 err = -ENETUNREACH;
190 goto out;
191 }
192 sin.sin_family = AF_INET;
193 sin.sin_addr.s_addr = daddr->s6_addr32[3];
194 sin.sin_port = usin->sin6_port;
195
196 err = __ip4_datagram_connect(sk,
197 (struct sockaddr *) &sin,
198 sizeof(sin));
199
200ipv4_connected:
201 if (err)
202 goto out;
203
204 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
205
206 if (ipv6_addr_any(&np->saddr) ||
207 ipv6_mapped_addr_any(&np->saddr))
208 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
209
210 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
211 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
212 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
213 &sk->sk_v6_rcv_saddr);
214 if (sk->sk_prot->rehash)
215 sk->sk_prot->rehash(sk);
216 }
217
218 goto out;
219 }
220
221 if (__ipv6_addr_needs_scope_id(addr_type)) {
222 if (addr_len >= sizeof(struct sockaddr_in6) &&
223 usin->sin6_scope_id) {
224 if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id)) {
225 err = -EINVAL;
226 goto out;
227 }
228 WRITE_ONCE(sk->sk_bound_dev_if, usin->sin6_scope_id);
229 }
230
231 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
232 WRITE_ONCE(sk->sk_bound_dev_if, READ_ONCE(np->mcast_oif));
233
234 /* Connect to link-local address requires an interface */
235 if (!sk->sk_bound_dev_if) {
236 err = -EINVAL;
237 goto out;
238 }
239 }
240
241 /* save the current peer information before updating it */
242 old_daddr = sk->sk_v6_daddr;
243 old_fl6_flowlabel = np->flow_label;
244 old_dport = inet->inet_dport;
245
246 sk->sk_v6_daddr = *daddr;
247 np->flow_label = fl6_flowlabel;
248 inet->inet_dport = usin->sin6_port;
249
250 /*
251 * Check for a route to destination an obtain the
252 * destination cache for it.
253 */
254
255 err = ip6_datagram_dst_update(sk, true);
256 if (err) {
257 /* Restore the socket peer info, to keep it consistent with
258 * the old socket state
259 */
260 sk->sk_v6_daddr = old_daddr;
261 np->flow_label = old_fl6_flowlabel;
262 inet->inet_dport = old_dport;
263 goto out;
264 }
265
266 reuseport_has_conns_set(sk);
267 sk->sk_state = TCP_ESTABLISHED;
268 sk_set_txhash(sk);
269out:
270 return err;
271}
272EXPORT_SYMBOL_GPL(__ip6_datagram_connect);
273
274int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
275{
276 int res;
277
278 lock_sock(sk);
279 res = __ip6_datagram_connect(sk, uaddr, addr_len);
280 release_sock(sk);
281 return res;
282}
283EXPORT_SYMBOL_GPL(ip6_datagram_connect);
284
285int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
286 int addr_len)
287{
288 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
289 if (sin6->sin6_family != AF_INET6)
290 return -EAFNOSUPPORT;
291 return ip6_datagram_connect(sk, uaddr, addr_len);
292}
293EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
294
295static void ipv6_icmp_error_rfc4884(const struct sk_buff *skb,
296 struct sock_ee_data_rfc4884 *out)
297{
298 switch (icmp6_hdr(skb)->icmp6_type) {
299 case ICMPV6_TIME_EXCEED:
300 case ICMPV6_DEST_UNREACH:
301 ip_icmp_error_rfc4884(skb, out, sizeof(struct icmp6hdr),
302 icmp6_hdr(skb)->icmp6_datagram_len * 8);
303 }
304}
305
306void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
307 __be16 port, u32 info, u8 *payload)
308{
309 struct icmp6hdr *icmph = icmp6_hdr(skb);
310 struct sock_exterr_skb *serr;
311
312 if (!inet6_test_bit(RECVERR6, sk))
313 return;
314
315 skb = skb_clone(skb, GFP_ATOMIC);
316 if (!skb)
317 return;
318
319 skb->protocol = htons(ETH_P_IPV6);
320
321 serr = SKB_EXT_ERR(skb);
322 serr->ee.ee_errno = err;
323 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
324 serr->ee.ee_type = icmph->icmp6_type;
325 serr->ee.ee_code = icmph->icmp6_code;
326 serr->ee.ee_pad = 0;
327 serr->ee.ee_info = info;
328 serr->ee.ee_data = 0;
329 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
330 skb_network_header(skb);
331 serr->port = port;
332
333 __skb_pull(skb, payload - skb->data);
334
335 if (inet6_test_bit(RECVERR6_RFC4884, sk))
336 ipv6_icmp_error_rfc4884(skb, &serr->ee.ee_rfc4884);
337
338 skb_reset_transport_header(skb);
339
340 if (sock_queue_err_skb(sk, skb))
341 kfree_skb(skb);
342}
343EXPORT_SYMBOL_GPL(ipv6_icmp_error);
344
345void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
346{
347 struct sock_exterr_skb *serr;
348 struct ipv6hdr *iph;
349 struct sk_buff *skb;
350
351 if (!inet6_test_bit(RECVERR6, sk))
352 return;
353
354 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
355 if (!skb)
356 return;
357
358 skb->protocol = htons(ETH_P_IPV6);
359
360 skb_put(skb, sizeof(struct ipv6hdr));
361 skb_reset_network_header(skb);
362 iph = ipv6_hdr(skb);
363 iph->daddr = fl6->daddr;
364 ip6_flow_hdr(iph, 0, 0);
365
366 serr = SKB_EXT_ERR(skb);
367 serr->ee.ee_errno = err;
368 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
369 serr->ee.ee_type = 0;
370 serr->ee.ee_code = 0;
371 serr->ee.ee_pad = 0;
372 serr->ee.ee_info = info;
373 serr->ee.ee_data = 0;
374 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
375 serr->port = fl6->fl6_dport;
376
377 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
378 skb_reset_transport_header(skb);
379
380 if (sock_queue_err_skb(sk, skb))
381 kfree_skb(skb);
382}
383
384void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
385{
386 struct ipv6_pinfo *np = inet6_sk(sk);
387 struct ipv6hdr *iph;
388 struct sk_buff *skb;
389 struct ip6_mtuinfo *mtu_info;
390
391 if (!np->rxopt.bits.rxpmtu)
392 return;
393
394 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
395 if (!skb)
396 return;
397
398 skb_put(skb, sizeof(struct ipv6hdr));
399 skb_reset_network_header(skb);
400 iph = ipv6_hdr(skb);
401 iph->daddr = fl6->daddr;
402
403 mtu_info = IP6CBMTU(skb);
404
405 mtu_info->ip6m_mtu = mtu;
406 mtu_info->ip6m_addr.sin6_family = AF_INET6;
407 mtu_info->ip6m_addr.sin6_port = 0;
408 mtu_info->ip6m_addr.sin6_flowinfo = 0;
409 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
410 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
411
412 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
413 skb_reset_transport_header(skb);
414
415 skb = xchg(&np->rxpmtu, skb);
416 kfree_skb(skb);
417}
418
419/* For some errors we have valid addr_offset even with zero payload and
420 * zero port. Also, addr_offset should be supported if port is set.
421 */
422static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
423{
424 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
425 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
426 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
427}
428
429/* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
430 *
431 * At one point, excluding local errors was a quick test to identify icmp/icmp6
432 * errors. This is no longer true, but the test remained, so the v6 stack,
433 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
434 */
435static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
436 struct sock_exterr_skb *serr)
437{
438 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
439 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
440 return true;
441
442 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
443 return false;
444
445 if (!IP6CB(skb)->iif)
446 return false;
447
448 return true;
449}
450
451/*
452 * Handle MSG_ERRQUEUE
453 */
454int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
455{
456 struct ipv6_pinfo *np = inet6_sk(sk);
457 struct sock_exterr_skb *serr;
458 struct sk_buff *skb;
459 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
460 struct {
461 struct sock_extended_err ee;
462 struct sockaddr_in6 offender;
463 } errhdr;
464 int err;
465 int copied;
466
467 err = -EAGAIN;
468 skb = sock_dequeue_err_skb(sk);
469 if (!skb)
470 goto out;
471
472 copied = skb->len;
473 if (copied > len) {
474 msg->msg_flags |= MSG_TRUNC;
475 copied = len;
476 }
477 err = skb_copy_datagram_msg(skb, 0, msg, copied);
478 if (unlikely(err)) {
479 kfree_skb(skb);
480 return err;
481 }
482 sock_recv_timestamp(msg, sk, skb);
483
484 serr = SKB_EXT_ERR(skb);
485
486 if (sin && ipv6_datagram_support_addr(serr)) {
487 const unsigned char *nh = skb_network_header(skb);
488 sin->sin6_family = AF_INET6;
489 sin->sin6_flowinfo = 0;
490 sin->sin6_port = serr->port;
491 if (skb->protocol == htons(ETH_P_IPV6)) {
492 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
493 struct ipv6hdr, daddr);
494 sin->sin6_addr = ip6h->daddr;
495 if (inet6_test_bit(SNDFLOW, sk))
496 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
497 sin->sin6_scope_id =
498 ipv6_iface_scope_id(&sin->sin6_addr,
499 IP6CB(skb)->iif);
500 } else {
501 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
502 &sin->sin6_addr);
503 sin->sin6_scope_id = 0;
504 }
505 *addr_len = sizeof(*sin);
506 }
507
508 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
509 sin = &errhdr.offender;
510 memset(sin, 0, sizeof(*sin));
511
512 if (ip6_datagram_support_cmsg(skb, serr)) {
513 sin->sin6_family = AF_INET6;
514 if (np->rxopt.all)
515 ip6_datagram_recv_common_ctl(sk, msg, skb);
516 if (skb->protocol == htons(ETH_P_IPV6)) {
517 sin->sin6_addr = ipv6_hdr(skb)->saddr;
518 if (np->rxopt.all)
519 ip6_datagram_recv_specific_ctl(sk, msg, skb);
520 sin->sin6_scope_id =
521 ipv6_iface_scope_id(&sin->sin6_addr,
522 IP6CB(skb)->iif);
523 } else {
524 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
525 &sin->sin6_addr);
526 if (inet_cmsg_flags(inet_sk(sk)))
527 ip_cmsg_recv(msg, skb);
528 }
529 }
530
531 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
532
533 /* Now we could try to dump offended packet options */
534
535 msg->msg_flags |= MSG_ERRQUEUE;
536 err = copied;
537
538 consume_skb(skb);
539out:
540 return err;
541}
542EXPORT_SYMBOL_GPL(ipv6_recv_error);
543
544/*
545 * Handle IPV6_RECVPATHMTU
546 */
547int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
548 int *addr_len)
549{
550 struct ipv6_pinfo *np = inet6_sk(sk);
551 struct sk_buff *skb;
552 struct ip6_mtuinfo mtu_info;
553 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
554 int err;
555 int copied;
556
557 err = -EAGAIN;
558 skb = xchg(&np->rxpmtu, NULL);
559 if (!skb)
560 goto out;
561
562 copied = skb->len;
563 if (copied > len) {
564 msg->msg_flags |= MSG_TRUNC;
565 copied = len;
566 }
567 err = skb_copy_datagram_msg(skb, 0, msg, copied);
568 if (err)
569 goto out_free_skb;
570
571 sock_recv_timestamp(msg, sk, skb);
572
573 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
574
575 if (sin) {
576 sin->sin6_family = AF_INET6;
577 sin->sin6_flowinfo = 0;
578 sin->sin6_port = 0;
579 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
580 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
581 *addr_len = sizeof(*sin);
582 }
583
584 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
585
586 err = copied;
587
588out_free_skb:
589 kfree_skb(skb);
590out:
591 return err;
592}
593
594
595void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
596 struct sk_buff *skb)
597{
598 struct ipv6_pinfo *np = inet6_sk(sk);
599 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
600
601 if (np->rxopt.bits.rxinfo) {
602 struct in6_pktinfo src_info;
603
604 if (is_ipv6) {
605 src_info.ipi6_ifindex = IP6CB(skb)->iif;
606 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
607 } else {
608 src_info.ipi6_ifindex =
609 PKTINFO_SKB_CB(skb)->ipi_ifindex;
610 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
611 &src_info.ipi6_addr);
612 }
613
614 if (src_info.ipi6_ifindex >= 0)
615 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
616 sizeof(src_info), &src_info);
617 }
618}
619
620void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
621 struct sk_buff *skb)
622{
623 struct ipv6_pinfo *np = inet6_sk(sk);
624 struct inet6_skb_parm *opt = IP6CB(skb);
625 unsigned char *nh = skb_network_header(skb);
626
627 if (np->rxopt.bits.rxhlim) {
628 int hlim = ipv6_hdr(skb)->hop_limit;
629 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
630 }
631
632 if (np->rxopt.bits.rxtclass) {
633 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
634 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
635 }
636
637 if (np->rxopt.bits.rxflow) {
638 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
639 if (flowinfo)
640 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
641 }
642
643 /* HbH is allowed only once */
644 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
645 u8 *ptr = nh + sizeof(struct ipv6hdr);
646 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
647 }
648
649 if (opt->lastopt &&
650 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
651 /*
652 * Silly enough, but we need to reparse in order to
653 * report extension headers (except for HbH)
654 * in order.
655 *
656 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
657 * (and WILL NOT be) defined because
658 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
659 */
660 unsigned int off = sizeof(struct ipv6hdr);
661 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
662
663 while (off <= opt->lastopt) {
664 unsigned int len;
665 u8 *ptr = nh + off;
666
667 switch (nexthdr) {
668 case IPPROTO_DSTOPTS:
669 nexthdr = ptr[0];
670 len = (ptr[1] + 1) << 3;
671 if (np->rxopt.bits.dstopts)
672 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
673 break;
674 case IPPROTO_ROUTING:
675 nexthdr = ptr[0];
676 len = (ptr[1] + 1) << 3;
677 if (np->rxopt.bits.srcrt)
678 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
679 break;
680 case IPPROTO_AH:
681 nexthdr = ptr[0];
682 len = (ptr[1] + 2) << 2;
683 break;
684 default:
685 nexthdr = ptr[0];
686 len = (ptr[1] + 1) << 3;
687 break;
688 }
689
690 off += len;
691 }
692 }
693
694 /* socket options in old style */
695 if (np->rxopt.bits.rxoinfo) {
696 struct in6_pktinfo src_info;
697
698 src_info.ipi6_ifindex = opt->iif;
699 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
700 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
701 }
702 if (np->rxopt.bits.rxohlim) {
703 int hlim = ipv6_hdr(skb)->hop_limit;
704 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
705 }
706 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
707 u8 *ptr = nh + sizeof(struct ipv6hdr);
708 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
709 }
710 if (np->rxopt.bits.odstopts && opt->dst0) {
711 u8 *ptr = nh + opt->dst0;
712 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
713 }
714 if (np->rxopt.bits.osrcrt && opt->srcrt) {
715 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
716 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
717 }
718 if (np->rxopt.bits.odstopts && opt->dst1) {
719 u8 *ptr = nh + opt->dst1;
720 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
721 }
722 if (np->rxopt.bits.rxorigdstaddr) {
723 struct sockaddr_in6 sin6;
724 __be16 _ports[2], *ports;
725
726 ports = skb_header_pointer(skb, skb_transport_offset(skb),
727 sizeof(_ports), &_ports);
728 if (ports) {
729 /* All current transport protocols have the port numbers in the
730 * first four bytes of the transport header and this function is
731 * written with this assumption in mind.
732 */
733 sin6.sin6_family = AF_INET6;
734 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
735 sin6.sin6_port = ports[1];
736 sin6.sin6_flowinfo = 0;
737 sin6.sin6_scope_id =
738 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
739 opt->iif);
740
741 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
742 }
743 }
744 if (np->rxopt.bits.recvfragsize && opt->frag_max_size) {
745 int val = opt->frag_max_size;
746
747 put_cmsg(msg, SOL_IPV6, IPV6_RECVFRAGSIZE, sizeof(val), &val);
748 }
749}
750
751void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
752 struct sk_buff *skb)
753{
754 ip6_datagram_recv_common_ctl(sk, msg, skb);
755 ip6_datagram_recv_specific_ctl(sk, msg, skb);
756}
757EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
758
759int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
760 struct msghdr *msg, struct flowi6 *fl6,
761 struct ipcm6_cookie *ipc6)
762{
763 struct in6_pktinfo *src_info;
764 struct cmsghdr *cmsg;
765 struct ipv6_rt_hdr *rthdr;
766 struct ipv6_opt_hdr *hdr;
767 struct ipv6_txoptions *opt = ipc6->opt;
768 int len;
769 int err = 0;
770
771 for_each_cmsghdr(cmsg, msg) {
772 int addr_type;
773
774 if (!CMSG_OK(msg, cmsg)) {
775 err = -EINVAL;
776 goto exit_f;
777 }
778
779 if (cmsg->cmsg_level == SOL_SOCKET) {
780 err = __sock_cmsg_send(sk, cmsg, &ipc6->sockc);
781 if (err)
782 return err;
783 continue;
784 }
785
786 if (cmsg->cmsg_level != SOL_IPV6)
787 continue;
788
789 switch (cmsg->cmsg_type) {
790 case IPV6_PKTINFO:
791 case IPV6_2292PKTINFO:
792 {
793 struct net_device *dev = NULL;
794 int src_idx;
795
796 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
797 err = -EINVAL;
798 goto exit_f;
799 }
800
801 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
802 src_idx = src_info->ipi6_ifindex;
803
804 if (src_idx) {
805 if (fl6->flowi6_oif &&
806 src_idx != fl6->flowi6_oif &&
807 (READ_ONCE(sk->sk_bound_dev_if) != fl6->flowi6_oif ||
808 !sk_dev_equal_l3scope(sk, src_idx)))
809 return -EINVAL;
810 fl6->flowi6_oif = src_idx;
811 }
812
813 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
814
815 rcu_read_lock();
816 if (fl6->flowi6_oif) {
817 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
818 if (!dev) {
819 rcu_read_unlock();
820 return -ENODEV;
821 }
822 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
823 rcu_read_unlock();
824 return -EINVAL;
825 }
826
827 if (addr_type != IPV6_ADDR_ANY) {
828 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
829 if (!ipv6_can_nonlocal_bind(net, inet_sk(sk)) &&
830 !ipv6_chk_addr_and_flags(net, &src_info->ipi6_addr,
831 dev, !strict, 0,
832 IFA_F_TENTATIVE) &&
833 !ipv6_chk_acast_addr_src(net, dev,
834 &src_info->ipi6_addr))
835 err = -EINVAL;
836 else
837 fl6->saddr = src_info->ipi6_addr;
838 }
839
840 rcu_read_unlock();
841
842 if (err)
843 goto exit_f;
844
845 break;
846 }
847
848 case IPV6_FLOWINFO:
849 if (cmsg->cmsg_len < CMSG_LEN(4)) {
850 err = -EINVAL;
851 goto exit_f;
852 }
853
854 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
855 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
856 err = -EINVAL;
857 goto exit_f;
858 }
859 }
860 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
861 break;
862
863 case IPV6_2292HOPOPTS:
864 case IPV6_HOPOPTS:
865 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
866 err = -EINVAL;
867 goto exit_f;
868 }
869
870 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
871 len = ((hdr->hdrlen + 1) << 3);
872 if (cmsg->cmsg_len < CMSG_LEN(len)) {
873 err = -EINVAL;
874 goto exit_f;
875 }
876 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
877 err = -EPERM;
878 goto exit_f;
879 }
880 opt->opt_nflen += len;
881 opt->hopopt = hdr;
882 break;
883
884 case IPV6_2292DSTOPTS:
885 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
886 err = -EINVAL;
887 goto exit_f;
888 }
889
890 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
891 len = ((hdr->hdrlen + 1) << 3);
892 if (cmsg->cmsg_len < CMSG_LEN(len)) {
893 err = -EINVAL;
894 goto exit_f;
895 }
896 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
897 err = -EPERM;
898 goto exit_f;
899 }
900 if (opt->dst1opt) {
901 err = -EINVAL;
902 goto exit_f;
903 }
904 opt->opt_flen += len;
905 opt->dst1opt = hdr;
906 break;
907
908 case IPV6_DSTOPTS:
909 case IPV6_RTHDRDSTOPTS:
910 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
911 err = -EINVAL;
912 goto exit_f;
913 }
914
915 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
916 len = ((hdr->hdrlen + 1) << 3);
917 if (cmsg->cmsg_len < CMSG_LEN(len)) {
918 err = -EINVAL;
919 goto exit_f;
920 }
921 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
922 err = -EPERM;
923 goto exit_f;
924 }
925 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
926 opt->opt_flen += len;
927 opt->dst1opt = hdr;
928 } else {
929 opt->opt_nflen += len;
930 opt->dst0opt = hdr;
931 }
932 break;
933
934 case IPV6_2292RTHDR:
935 case IPV6_RTHDR:
936 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
937 err = -EINVAL;
938 goto exit_f;
939 }
940
941 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
942
943 switch (rthdr->type) {
944#if IS_ENABLED(CONFIG_IPV6_MIP6)
945 case IPV6_SRCRT_TYPE_2:
946 if (rthdr->hdrlen != 2 ||
947 rthdr->segments_left != 1) {
948 err = -EINVAL;
949 goto exit_f;
950 }
951 break;
952#endif
953 default:
954 err = -EINVAL;
955 goto exit_f;
956 }
957
958 len = ((rthdr->hdrlen + 1) << 3);
959
960 if (cmsg->cmsg_len < CMSG_LEN(len)) {
961 err = -EINVAL;
962 goto exit_f;
963 }
964
965 /* segments left must also match */
966 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
967 err = -EINVAL;
968 goto exit_f;
969 }
970
971 opt->opt_nflen += len;
972 opt->srcrt = rthdr;
973
974 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
975 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
976
977 opt->opt_nflen += dsthdrlen;
978 opt->dst0opt = opt->dst1opt;
979 opt->dst1opt = NULL;
980 opt->opt_flen -= dsthdrlen;
981 }
982
983 break;
984
985 case IPV6_2292HOPLIMIT:
986 case IPV6_HOPLIMIT:
987 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
988 err = -EINVAL;
989 goto exit_f;
990 }
991
992 ipc6->hlimit = *(int *)CMSG_DATA(cmsg);
993 if (ipc6->hlimit < -1 || ipc6->hlimit > 0xff) {
994 err = -EINVAL;
995 goto exit_f;
996 }
997
998 break;
999
1000 case IPV6_TCLASS:
1001 {
1002 int tc;
1003
1004 err = -EINVAL;
1005 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
1006 goto exit_f;
1007
1008 tc = *(int *)CMSG_DATA(cmsg);
1009 if (tc < -1 || tc > 0xff)
1010 goto exit_f;
1011
1012 err = 0;
1013 ipc6->tclass = tc;
1014
1015 break;
1016 }
1017
1018 case IPV6_DONTFRAG:
1019 {
1020 int df;
1021
1022 err = -EINVAL;
1023 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
1024 goto exit_f;
1025
1026 df = *(int *)CMSG_DATA(cmsg);
1027 if (df < 0 || df > 1)
1028 goto exit_f;
1029
1030 err = 0;
1031 ipc6->dontfrag = df;
1032
1033 break;
1034 }
1035 default:
1036 net_dbg_ratelimited("invalid cmsg type: %d\n",
1037 cmsg->cmsg_type);
1038 err = -EINVAL;
1039 goto exit_f;
1040 }
1041 }
1042
1043exit_f:
1044 return err;
1045}
1046EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
1047
1048void __ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
1049 __u16 srcp, __u16 destp, int rqueue, int bucket)
1050{
1051 const struct in6_addr *dest, *src;
1052
1053 dest = &sp->sk_v6_daddr;
1054 src = &sp->sk_v6_rcv_saddr;
1055 seq_printf(seq,
1056 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1057 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
1058 bucket,
1059 src->s6_addr32[0], src->s6_addr32[1],
1060 src->s6_addr32[2], src->s6_addr32[3], srcp,
1061 dest->s6_addr32[0], dest->s6_addr32[1],
1062 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1063 sp->sk_state,
1064 sk_wmem_alloc_get(sp),
1065 rqueue,
1066 0, 0L, 0,
1067 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1068 0,
1069 sock_i_ino(sp),
1070 refcount_read(&sp->sk_refcnt), sp,
1071 atomic_read(&sp->sk_drops));
1072}