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Merge tag 'for-linus-4.10-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-zesty-kernel.git] / net / ipv6 / datagram.c
1 /*
2 * common UDP/RAW code
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14 #include <linux/capability.h>
15 #include <linux/errno.h>
16 #include <linux/types.h>
17 #include <linux/kernel.h>
18 #include <linux/interrupt.h>
19 #include <linux/socket.h>
20 #include <linux/sockios.h>
21 #include <linux/in6.h>
22 #include <linux/ipv6.h>
23 #include <linux/route.h>
24 #include <linux/slab.h>
25 #include <linux/export.h>
26
27 #include <net/ipv6.h>
28 #include <net/ndisc.h>
29 #include <net/addrconf.h>
30 #include <net/transp_v6.h>
31 #include <net/ip6_route.h>
32 #include <net/tcp_states.h>
33 #include <net/dsfield.h>
34
35 #include <linux/errqueue.h>
36 #include <linux/uaccess.h>
37
38 static bool ipv6_mapped_addr_any(const struct in6_addr *a)
39 {
40 return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0);
41 }
42
43 static void ip6_datagram_flow_key_init(struct flowi6 *fl6, struct sock *sk)
44 {
45 struct inet_sock *inet = inet_sk(sk);
46 struct ipv6_pinfo *np = inet6_sk(sk);
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_oif = sk->sk_bound_dev_if;
53 fl6->flowi6_mark = sk->sk_mark;
54 fl6->fl6_dport = inet->inet_dport;
55 fl6->fl6_sport = inet->inet_sport;
56 fl6->flowlabel = np->flow_label;
57 fl6->flowi6_uid = sk->sk_uid;
58
59 if (!fl6->flowi6_oif)
60 fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
61
62 if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr))
63 fl6->flowi6_oif = np->mcast_oif;
64
65 security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
66 }
67
68 int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr)
69 {
70 struct ip6_flowlabel *flowlabel = NULL;
71 struct in6_addr *final_p, final;
72 struct ipv6_txoptions *opt;
73 struct dst_entry *dst;
74 struct inet_sock *inet = inet_sk(sk);
75 struct ipv6_pinfo *np = inet6_sk(sk);
76 struct flowi6 fl6;
77 int err = 0;
78
79 if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) {
80 flowlabel = fl6_sock_lookup(sk, np->flow_label);
81 if (!flowlabel)
82 return -EINVAL;
83 }
84 ip6_datagram_flow_key_init(&fl6, sk);
85
86 rcu_read_lock();
87 opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt);
88 final_p = fl6_update_dst(&fl6, opt, &final);
89 rcu_read_unlock();
90
91 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
92 if (IS_ERR(dst)) {
93 err = PTR_ERR(dst);
94 goto out;
95 }
96
97 if (fix_sk_saddr) {
98 if (ipv6_addr_any(&np->saddr))
99 np->saddr = fl6.saddr;
100
101 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
102 sk->sk_v6_rcv_saddr = fl6.saddr;
103 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
104 if (sk->sk_prot->rehash)
105 sk->sk_prot->rehash(sk);
106 }
107 }
108
109 ip6_dst_store(sk, dst,
110 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
111 &sk->sk_v6_daddr : NULL,
112 #ifdef CONFIG_IPV6_SUBTREES
113 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
114 &np->saddr :
115 #endif
116 NULL);
117
118 out:
119 fl6_sock_release(flowlabel);
120 return err;
121 }
122
123 void ip6_datagram_release_cb(struct sock *sk)
124 {
125 struct dst_entry *dst;
126
127 if (ipv6_addr_v4mapped(&sk->sk_v6_daddr))
128 return;
129
130 rcu_read_lock();
131 dst = __sk_dst_get(sk);
132 if (!dst || !dst->obsolete ||
133 dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) {
134 rcu_read_unlock();
135 return;
136 }
137 rcu_read_unlock();
138
139 ip6_datagram_dst_update(sk, false);
140 }
141 EXPORT_SYMBOL_GPL(ip6_datagram_release_cb);
142
143 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr,
144 int addr_len)
145 {
146 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
147 struct inet_sock *inet = inet_sk(sk);
148 struct ipv6_pinfo *np = inet6_sk(sk);
149 struct in6_addr *daddr;
150 int addr_type;
151 int err;
152 __be32 fl6_flowlabel = 0;
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 (np->sndflow)
168 fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
169
170 addr_type = ipv6_addr_type(&usin->sin6_addr);
171
172 if (addr_type == IPV6_ADDR_ANY) {
173 /*
174 * connect to self
175 */
176 usin->sin6_addr.s6_addr[15] = 0x01;
177 }
178
179 daddr = &usin->sin6_addr;
180
181 if (addr_type == IPV6_ADDR_MAPPED) {
182 struct sockaddr_in sin;
183
184 if (__ipv6_only_sock(sk)) {
185 err = -ENETUNREACH;
186 goto out;
187 }
188 sin.sin_family = AF_INET;
189 sin.sin_addr.s_addr = daddr->s6_addr32[3];
190 sin.sin_port = usin->sin6_port;
191
192 err = __ip4_datagram_connect(sk,
193 (struct sockaddr *) &sin,
194 sizeof(sin));
195
196 ipv4_connected:
197 if (err)
198 goto out;
199
200 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
201
202 if (ipv6_addr_any(&np->saddr) ||
203 ipv6_mapped_addr_any(&np->saddr))
204 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
205
206 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
207 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
208 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
209 &sk->sk_v6_rcv_saddr);
210 if (sk->sk_prot->rehash)
211 sk->sk_prot->rehash(sk);
212 }
213
214 goto out;
215 }
216
217 if (__ipv6_addr_needs_scope_id(addr_type)) {
218 if (addr_len >= sizeof(struct sockaddr_in6) &&
219 usin->sin6_scope_id) {
220 if (sk->sk_bound_dev_if &&
221 sk->sk_bound_dev_if != usin->sin6_scope_id) {
222 err = -EINVAL;
223 goto out;
224 }
225 sk->sk_bound_dev_if = usin->sin6_scope_id;
226 }
227
228 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
229 sk->sk_bound_dev_if = np->mcast_oif;
230
231 /* Connect to link-local address requires an interface */
232 if (!sk->sk_bound_dev_if) {
233 err = -EINVAL;
234 goto out;
235 }
236 }
237
238 sk->sk_v6_daddr = *daddr;
239 np->flow_label = fl6_flowlabel;
240
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 goto out;
251
252 sk->sk_state = TCP_ESTABLISHED;
253 sk_set_txhash(sk);
254 out:
255 return err;
256 }
257 EXPORT_SYMBOL_GPL(__ip6_datagram_connect);
258
259 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
260 {
261 int res;
262
263 lock_sock(sk);
264 res = __ip6_datagram_connect(sk, uaddr, addr_len);
265 release_sock(sk);
266 return res;
267 }
268 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
269
270 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
271 int addr_len)
272 {
273 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
274 if (sin6->sin6_family != AF_INET6)
275 return -EAFNOSUPPORT;
276 return ip6_datagram_connect(sk, uaddr, addr_len);
277 }
278 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
279
280 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
281 __be16 port, u32 info, u8 *payload)
282 {
283 struct ipv6_pinfo *np = inet6_sk(sk);
284 struct icmp6hdr *icmph = icmp6_hdr(skb);
285 struct sock_exterr_skb *serr;
286
287 if (!np->recverr)
288 return;
289
290 skb = skb_clone(skb, GFP_ATOMIC);
291 if (!skb)
292 return;
293
294 skb->protocol = htons(ETH_P_IPV6);
295
296 serr = SKB_EXT_ERR(skb);
297 serr->ee.ee_errno = err;
298 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
299 serr->ee.ee_type = icmph->icmp6_type;
300 serr->ee.ee_code = icmph->icmp6_code;
301 serr->ee.ee_pad = 0;
302 serr->ee.ee_info = info;
303 serr->ee.ee_data = 0;
304 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
305 skb_network_header(skb);
306 serr->port = port;
307
308 __skb_pull(skb, payload - skb->data);
309 skb_reset_transport_header(skb);
310
311 if (sock_queue_err_skb(sk, skb))
312 kfree_skb(skb);
313 }
314
315 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
316 {
317 const struct ipv6_pinfo *np = inet6_sk(sk);
318 struct sock_exterr_skb *serr;
319 struct ipv6hdr *iph;
320 struct sk_buff *skb;
321
322 if (!np->recverr)
323 return;
324
325 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
326 if (!skb)
327 return;
328
329 skb->protocol = htons(ETH_P_IPV6);
330
331 skb_put(skb, sizeof(struct ipv6hdr));
332 skb_reset_network_header(skb);
333 iph = ipv6_hdr(skb);
334 iph->daddr = fl6->daddr;
335
336 serr = SKB_EXT_ERR(skb);
337 serr->ee.ee_errno = err;
338 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
339 serr->ee.ee_type = 0;
340 serr->ee.ee_code = 0;
341 serr->ee.ee_pad = 0;
342 serr->ee.ee_info = info;
343 serr->ee.ee_data = 0;
344 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
345 serr->port = fl6->fl6_dport;
346
347 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
348 skb_reset_transport_header(skb);
349
350 if (sock_queue_err_skb(sk, skb))
351 kfree_skb(skb);
352 }
353
354 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
355 {
356 struct ipv6_pinfo *np = inet6_sk(sk);
357 struct ipv6hdr *iph;
358 struct sk_buff *skb;
359 struct ip6_mtuinfo *mtu_info;
360
361 if (!np->rxopt.bits.rxpmtu)
362 return;
363
364 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
365 if (!skb)
366 return;
367
368 skb_put(skb, sizeof(struct ipv6hdr));
369 skb_reset_network_header(skb);
370 iph = ipv6_hdr(skb);
371 iph->daddr = fl6->daddr;
372
373 mtu_info = IP6CBMTU(skb);
374
375 mtu_info->ip6m_mtu = mtu;
376 mtu_info->ip6m_addr.sin6_family = AF_INET6;
377 mtu_info->ip6m_addr.sin6_port = 0;
378 mtu_info->ip6m_addr.sin6_flowinfo = 0;
379 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
380 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
381
382 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
383 skb_reset_transport_header(skb);
384
385 skb = xchg(&np->rxpmtu, skb);
386 kfree_skb(skb);
387 }
388
389 /* For some errors we have valid addr_offset even with zero payload and
390 * zero port. Also, addr_offset should be supported if port is set.
391 */
392 static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
393 {
394 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
395 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
396 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
397 }
398
399 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
400 *
401 * At one point, excluding local errors was a quick test to identify icmp/icmp6
402 * errors. This is no longer true, but the test remained, so the v6 stack,
403 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
404 *
405 * Timestamp code paths do not initialize the fields expected by cmsg:
406 * the PKTINFO fields in skb->cb[]. Fill those in here.
407 */
408 static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
409 struct sock_exterr_skb *serr)
410 {
411 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
412 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
413 return true;
414
415 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
416 return false;
417
418 if (!skb->dev)
419 return false;
420
421 if (skb->protocol == htons(ETH_P_IPV6))
422 IP6CB(skb)->iif = skb->dev->ifindex;
423 else
424 PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex;
425
426 return true;
427 }
428
429 /*
430 * Handle MSG_ERRQUEUE
431 */
432 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
433 {
434 struct ipv6_pinfo *np = inet6_sk(sk);
435 struct sock_exterr_skb *serr;
436 struct sk_buff *skb;
437 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
438 struct {
439 struct sock_extended_err ee;
440 struct sockaddr_in6 offender;
441 } errhdr;
442 int err;
443 int copied;
444
445 err = -EAGAIN;
446 skb = sock_dequeue_err_skb(sk);
447 if (!skb)
448 goto out;
449
450 copied = skb->len;
451 if (copied > len) {
452 msg->msg_flags |= MSG_TRUNC;
453 copied = len;
454 }
455 err = skb_copy_datagram_msg(skb, 0, msg, copied);
456 if (unlikely(err)) {
457 kfree_skb(skb);
458 return err;
459 }
460 sock_recv_timestamp(msg, sk, skb);
461
462 serr = SKB_EXT_ERR(skb);
463
464 if (sin && ipv6_datagram_support_addr(serr)) {
465 const unsigned char *nh = skb_network_header(skb);
466 sin->sin6_family = AF_INET6;
467 sin->sin6_flowinfo = 0;
468 sin->sin6_port = serr->port;
469 if (skb->protocol == htons(ETH_P_IPV6)) {
470 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
471 struct ipv6hdr, daddr);
472 sin->sin6_addr = ip6h->daddr;
473 if (np->sndflow)
474 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
475 sin->sin6_scope_id =
476 ipv6_iface_scope_id(&sin->sin6_addr,
477 IP6CB(skb)->iif);
478 } else {
479 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
480 &sin->sin6_addr);
481 sin->sin6_scope_id = 0;
482 }
483 *addr_len = sizeof(*sin);
484 }
485
486 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
487 sin = &errhdr.offender;
488 memset(sin, 0, sizeof(*sin));
489
490 if (ip6_datagram_support_cmsg(skb, serr)) {
491 sin->sin6_family = AF_INET6;
492 if (np->rxopt.all)
493 ip6_datagram_recv_common_ctl(sk, msg, skb);
494 if (skb->protocol == htons(ETH_P_IPV6)) {
495 sin->sin6_addr = ipv6_hdr(skb)->saddr;
496 if (np->rxopt.all)
497 ip6_datagram_recv_specific_ctl(sk, msg, skb);
498 sin->sin6_scope_id =
499 ipv6_iface_scope_id(&sin->sin6_addr,
500 IP6CB(skb)->iif);
501 } else {
502 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
503 &sin->sin6_addr);
504 if (inet_sk(sk)->cmsg_flags)
505 ip_cmsg_recv(msg, skb);
506 }
507 }
508
509 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
510
511 /* Now we could try to dump offended packet options */
512
513 msg->msg_flags |= MSG_ERRQUEUE;
514 err = copied;
515
516 consume_skb(skb);
517 out:
518 return err;
519 }
520 EXPORT_SYMBOL_GPL(ipv6_recv_error);
521
522 /*
523 * Handle IPV6_RECVPATHMTU
524 */
525 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
526 int *addr_len)
527 {
528 struct ipv6_pinfo *np = inet6_sk(sk);
529 struct sk_buff *skb;
530 struct ip6_mtuinfo mtu_info;
531 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
532 int err;
533 int copied;
534
535 err = -EAGAIN;
536 skb = xchg(&np->rxpmtu, NULL);
537 if (!skb)
538 goto out;
539
540 copied = skb->len;
541 if (copied > len) {
542 msg->msg_flags |= MSG_TRUNC;
543 copied = len;
544 }
545 err = skb_copy_datagram_msg(skb, 0, msg, copied);
546 if (err)
547 goto out_free_skb;
548
549 sock_recv_timestamp(msg, sk, skb);
550
551 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
552
553 if (sin) {
554 sin->sin6_family = AF_INET6;
555 sin->sin6_flowinfo = 0;
556 sin->sin6_port = 0;
557 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
558 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
559 *addr_len = sizeof(*sin);
560 }
561
562 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
563
564 err = copied;
565
566 out_free_skb:
567 kfree_skb(skb);
568 out:
569 return err;
570 }
571
572
573 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
574 struct sk_buff *skb)
575 {
576 struct ipv6_pinfo *np = inet6_sk(sk);
577 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
578
579 if (np->rxopt.bits.rxinfo) {
580 struct in6_pktinfo src_info;
581
582 if (is_ipv6) {
583 src_info.ipi6_ifindex = IP6CB(skb)->iif;
584 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
585 } else {
586 src_info.ipi6_ifindex =
587 PKTINFO_SKB_CB(skb)->ipi_ifindex;
588 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
589 &src_info.ipi6_addr);
590 }
591
592 if (src_info.ipi6_ifindex >= 0)
593 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
594 sizeof(src_info), &src_info);
595 }
596 }
597
598 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
599 struct sk_buff *skb)
600 {
601 struct ipv6_pinfo *np = inet6_sk(sk);
602 struct inet6_skb_parm *opt = IP6CB(skb);
603 unsigned char *nh = skb_network_header(skb);
604
605 if (np->rxopt.bits.rxhlim) {
606 int hlim = ipv6_hdr(skb)->hop_limit;
607 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
608 }
609
610 if (np->rxopt.bits.rxtclass) {
611 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
612 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
613 }
614
615 if (np->rxopt.bits.rxflow) {
616 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
617 if (flowinfo)
618 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
619 }
620
621 /* HbH is allowed only once */
622 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
623 u8 *ptr = nh + sizeof(struct ipv6hdr);
624 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
625 }
626
627 if (opt->lastopt &&
628 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
629 /*
630 * Silly enough, but we need to reparse in order to
631 * report extension headers (except for HbH)
632 * in order.
633 *
634 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
635 * (and WILL NOT be) defined because
636 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
637 */
638 unsigned int off = sizeof(struct ipv6hdr);
639 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
640
641 while (off <= opt->lastopt) {
642 unsigned int len;
643 u8 *ptr = nh + off;
644
645 switch (nexthdr) {
646 case IPPROTO_DSTOPTS:
647 nexthdr = ptr[0];
648 len = (ptr[1] + 1) << 3;
649 if (np->rxopt.bits.dstopts)
650 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
651 break;
652 case IPPROTO_ROUTING:
653 nexthdr = ptr[0];
654 len = (ptr[1] + 1) << 3;
655 if (np->rxopt.bits.srcrt)
656 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
657 break;
658 case IPPROTO_AH:
659 nexthdr = ptr[0];
660 len = (ptr[1] + 2) << 2;
661 break;
662 default:
663 nexthdr = ptr[0];
664 len = (ptr[1] + 1) << 3;
665 break;
666 }
667
668 off += len;
669 }
670 }
671
672 /* socket options in old style */
673 if (np->rxopt.bits.rxoinfo) {
674 struct in6_pktinfo src_info;
675
676 src_info.ipi6_ifindex = opt->iif;
677 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
678 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
679 }
680 if (np->rxopt.bits.rxohlim) {
681 int hlim = ipv6_hdr(skb)->hop_limit;
682 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
683 }
684 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
685 u8 *ptr = nh + sizeof(struct ipv6hdr);
686 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
687 }
688 if (np->rxopt.bits.odstopts && opt->dst0) {
689 u8 *ptr = nh + opt->dst0;
690 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
691 }
692 if (np->rxopt.bits.osrcrt && opt->srcrt) {
693 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
694 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
695 }
696 if (np->rxopt.bits.odstopts && opt->dst1) {
697 u8 *ptr = nh + opt->dst1;
698 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
699 }
700 if (np->rxopt.bits.rxorigdstaddr) {
701 struct sockaddr_in6 sin6;
702 __be16 *ports = (__be16 *) skb_transport_header(skb);
703
704 if (skb_transport_offset(skb) + 4 <= (int)skb->len) {
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.
708 */
709
710 sin6.sin6_family = AF_INET6;
711 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
712 sin6.sin6_port = ports[1];
713 sin6.sin6_flowinfo = 0;
714 sin6.sin6_scope_id =
715 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
716 opt->iif);
717
718 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
719 }
720 }
721 if (np->rxopt.bits.recvfragsize && opt->frag_max_size) {
722 int val = opt->frag_max_size;
723
724 put_cmsg(msg, SOL_IPV6, IPV6_RECVFRAGSIZE, sizeof(val), &val);
725 }
726 }
727
728 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
729 struct sk_buff *skb)
730 {
731 ip6_datagram_recv_common_ctl(sk, msg, skb);
732 ip6_datagram_recv_specific_ctl(sk, msg, skb);
733 }
734 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
735
736 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
737 struct msghdr *msg, struct flowi6 *fl6,
738 struct ipcm6_cookie *ipc6, struct sockcm_cookie *sockc)
739 {
740 struct in6_pktinfo *src_info;
741 struct cmsghdr *cmsg;
742 struct ipv6_rt_hdr *rthdr;
743 struct ipv6_opt_hdr *hdr;
744 struct ipv6_txoptions *opt = ipc6->opt;
745 int len;
746 int err = 0;
747
748 for_each_cmsghdr(cmsg, msg) {
749 int addr_type;
750
751 if (!CMSG_OK(msg, cmsg)) {
752 err = -EINVAL;
753 goto exit_f;
754 }
755
756 if (cmsg->cmsg_level == SOL_SOCKET) {
757 err = __sock_cmsg_send(sk, msg, cmsg, sockc);
758 if (err)
759 return err;
760 continue;
761 }
762
763 if (cmsg->cmsg_level != SOL_IPV6)
764 continue;
765
766 switch (cmsg->cmsg_type) {
767 case IPV6_PKTINFO:
768 case IPV6_2292PKTINFO:
769 {
770 struct net_device *dev = NULL;
771
772 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
773 err = -EINVAL;
774 goto exit_f;
775 }
776
777 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
778
779 if (src_info->ipi6_ifindex) {
780 if (fl6->flowi6_oif &&
781 src_info->ipi6_ifindex != fl6->flowi6_oif)
782 return -EINVAL;
783 fl6->flowi6_oif = src_info->ipi6_ifindex;
784 }
785
786 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
787
788 rcu_read_lock();
789 if (fl6->flowi6_oif) {
790 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
791 if (!dev) {
792 rcu_read_unlock();
793 return -ENODEV;
794 }
795 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
796 rcu_read_unlock();
797 return -EINVAL;
798 }
799
800 if (addr_type != IPV6_ADDR_ANY) {
801 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
802 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
803 !ipv6_chk_addr(net, &src_info->ipi6_addr,
804 strict ? dev : NULL, 0) &&
805 !ipv6_chk_acast_addr_src(net, dev,
806 &src_info->ipi6_addr))
807 err = -EINVAL;
808 else
809 fl6->saddr = src_info->ipi6_addr;
810 }
811
812 rcu_read_unlock();
813
814 if (err)
815 goto exit_f;
816
817 break;
818 }
819
820 case IPV6_FLOWINFO:
821 if (cmsg->cmsg_len < CMSG_LEN(4)) {
822 err = -EINVAL;
823 goto exit_f;
824 }
825
826 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
827 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
828 err = -EINVAL;
829 goto exit_f;
830 }
831 }
832 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
833 break;
834
835 case IPV6_2292HOPOPTS:
836 case IPV6_HOPOPTS:
837 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
838 err = -EINVAL;
839 goto exit_f;
840 }
841
842 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
843 len = ((hdr->hdrlen + 1) << 3);
844 if (cmsg->cmsg_len < CMSG_LEN(len)) {
845 err = -EINVAL;
846 goto exit_f;
847 }
848 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
849 err = -EPERM;
850 goto exit_f;
851 }
852 opt->opt_nflen += len;
853 opt->hopopt = hdr;
854 break;
855
856 case IPV6_2292DSTOPTS:
857 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
858 err = -EINVAL;
859 goto exit_f;
860 }
861
862 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
863 len = ((hdr->hdrlen + 1) << 3);
864 if (cmsg->cmsg_len < CMSG_LEN(len)) {
865 err = -EINVAL;
866 goto exit_f;
867 }
868 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
869 err = -EPERM;
870 goto exit_f;
871 }
872 if (opt->dst1opt) {
873 err = -EINVAL;
874 goto exit_f;
875 }
876 opt->opt_flen += len;
877 opt->dst1opt = hdr;
878 break;
879
880 case IPV6_DSTOPTS:
881 case IPV6_RTHDRDSTOPTS:
882 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
883 err = -EINVAL;
884 goto exit_f;
885 }
886
887 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
888 len = ((hdr->hdrlen + 1) << 3);
889 if (cmsg->cmsg_len < CMSG_LEN(len)) {
890 err = -EINVAL;
891 goto exit_f;
892 }
893 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
894 err = -EPERM;
895 goto exit_f;
896 }
897 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
898 opt->opt_flen += len;
899 opt->dst1opt = hdr;
900 } else {
901 opt->opt_nflen += len;
902 opt->dst0opt = hdr;
903 }
904 break;
905
906 case IPV6_2292RTHDR:
907 case IPV6_RTHDR:
908 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
909 err = -EINVAL;
910 goto exit_f;
911 }
912
913 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
914
915 switch (rthdr->type) {
916 #if IS_ENABLED(CONFIG_IPV6_MIP6)
917 case IPV6_SRCRT_TYPE_2:
918 if (rthdr->hdrlen != 2 ||
919 rthdr->segments_left != 1) {
920 err = -EINVAL;
921 goto exit_f;
922 }
923 break;
924 #endif
925 default:
926 err = -EINVAL;
927 goto exit_f;
928 }
929
930 len = ((rthdr->hdrlen + 1) << 3);
931
932 if (cmsg->cmsg_len < CMSG_LEN(len)) {
933 err = -EINVAL;
934 goto exit_f;
935 }
936
937 /* segments left must also match */
938 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
939 err = -EINVAL;
940 goto exit_f;
941 }
942
943 opt->opt_nflen += len;
944 opt->srcrt = rthdr;
945
946 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
947 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
948
949 opt->opt_nflen += dsthdrlen;
950 opt->dst0opt = opt->dst1opt;
951 opt->dst1opt = NULL;
952 opt->opt_flen -= dsthdrlen;
953 }
954
955 break;
956
957 case IPV6_2292HOPLIMIT:
958 case IPV6_HOPLIMIT:
959 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
960 err = -EINVAL;
961 goto exit_f;
962 }
963
964 ipc6->hlimit = *(int *)CMSG_DATA(cmsg);
965 if (ipc6->hlimit < -1 || ipc6->hlimit > 0xff) {
966 err = -EINVAL;
967 goto exit_f;
968 }
969
970 break;
971
972 case IPV6_TCLASS:
973 {
974 int tc;
975
976 err = -EINVAL;
977 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
978 goto exit_f;
979
980 tc = *(int *)CMSG_DATA(cmsg);
981 if (tc < -1 || tc > 0xff)
982 goto exit_f;
983
984 err = 0;
985 ipc6->tclass = tc;
986
987 break;
988 }
989
990 case IPV6_DONTFRAG:
991 {
992 int df;
993
994 err = -EINVAL;
995 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
996 goto exit_f;
997
998 df = *(int *)CMSG_DATA(cmsg);
999 if (df < 0 || df > 1)
1000 goto exit_f;
1001
1002 err = 0;
1003 ipc6->dontfrag = df;
1004
1005 break;
1006 }
1007 default:
1008 net_dbg_ratelimited("invalid cmsg type: %d\n",
1009 cmsg->cmsg_type);
1010 err = -EINVAL;
1011 goto exit_f;
1012 }
1013 }
1014
1015 exit_f:
1016 return err;
1017 }
1018 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
1019
1020 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
1021 __u16 srcp, __u16 destp, int bucket)
1022 {
1023 const struct in6_addr *dest, *src;
1024
1025 dest = &sp->sk_v6_daddr;
1026 src = &sp->sk_v6_rcv_saddr;
1027 seq_printf(seq,
1028 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1029 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
1030 bucket,
1031 src->s6_addr32[0], src->s6_addr32[1],
1032 src->s6_addr32[2], src->s6_addr32[3], srcp,
1033 dest->s6_addr32[0], dest->s6_addr32[1],
1034 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1035 sp->sk_state,
1036 sk_wmem_alloc_get(sp),
1037 sk_rmem_alloc_get(sp),
1038 0, 0L, 0,
1039 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1040 0,
1041 sock_i_ino(sp),
1042 atomic_read(&sp->sk_refcnt), sp,
1043 atomic_read(&sp->sk_drops));
1044 }
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