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Merge tag 'drm-intel-next-fixes-2016-01-14' of git://anongit.freedesktop.org/drm...
[deliverable/linux.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 <asm/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 int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
44 {
45 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
46 struct inet_sock *inet = inet_sk(sk);
47 struct ipv6_pinfo *np = inet6_sk(sk);
48 struct in6_addr *daddr, *final_p, final;
49 struct dst_entry *dst;
50 struct flowi6 fl6;
51 struct ip6_flowlabel *flowlabel = NULL;
52 struct ipv6_txoptions *opt;
53 int addr_type;
54 int err;
55
56 if (usin->sin6_family == AF_INET) {
57 if (__ipv6_only_sock(sk))
58 return -EAFNOSUPPORT;
59 err = __ip4_datagram_connect(sk, uaddr, addr_len);
60 goto ipv4_connected;
61 }
62
63 if (addr_len < SIN6_LEN_RFC2133)
64 return -EINVAL;
65
66 if (usin->sin6_family != AF_INET6)
67 return -EAFNOSUPPORT;
68
69 memset(&fl6, 0, sizeof(fl6));
70 if (np->sndflow) {
71 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
72 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
73 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
74 if (!flowlabel)
75 return -EINVAL;
76 }
77 }
78
79 addr_type = ipv6_addr_type(&usin->sin6_addr);
80
81 if (addr_type == IPV6_ADDR_ANY) {
82 /*
83 * connect to self
84 */
85 usin->sin6_addr.s6_addr[15] = 0x01;
86 }
87
88 daddr = &usin->sin6_addr;
89
90 if (addr_type == IPV6_ADDR_MAPPED) {
91 struct sockaddr_in sin;
92
93 if (__ipv6_only_sock(sk)) {
94 err = -ENETUNREACH;
95 goto out;
96 }
97 sin.sin_family = AF_INET;
98 sin.sin_addr.s_addr = daddr->s6_addr32[3];
99 sin.sin_port = usin->sin6_port;
100
101 err = __ip4_datagram_connect(sk,
102 (struct sockaddr *) &sin,
103 sizeof(sin));
104
105 ipv4_connected:
106 if (err)
107 goto out;
108
109 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
110
111 if (ipv6_addr_any(&np->saddr) ||
112 ipv6_mapped_addr_any(&np->saddr))
113 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
114
115 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
116 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
117 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
118 &sk->sk_v6_rcv_saddr);
119 if (sk->sk_prot->rehash)
120 sk->sk_prot->rehash(sk);
121 }
122
123 goto out;
124 }
125
126 if (__ipv6_addr_needs_scope_id(addr_type)) {
127 if (addr_len >= sizeof(struct sockaddr_in6) &&
128 usin->sin6_scope_id) {
129 if (sk->sk_bound_dev_if &&
130 sk->sk_bound_dev_if != usin->sin6_scope_id) {
131 err = -EINVAL;
132 goto out;
133 }
134 sk->sk_bound_dev_if = usin->sin6_scope_id;
135 }
136
137 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
138 sk->sk_bound_dev_if = np->mcast_oif;
139
140 /* Connect to link-local address requires an interface */
141 if (!sk->sk_bound_dev_if) {
142 err = -EINVAL;
143 goto out;
144 }
145 }
146
147 sk->sk_v6_daddr = *daddr;
148 np->flow_label = fl6.flowlabel;
149
150 inet->inet_dport = usin->sin6_port;
151
152 /*
153 * Check for a route to destination an obtain the
154 * destination cache for it.
155 */
156
157 fl6.flowi6_proto = sk->sk_protocol;
158 fl6.daddr = sk->sk_v6_daddr;
159 fl6.saddr = np->saddr;
160 fl6.flowi6_oif = sk->sk_bound_dev_if;
161 fl6.flowi6_mark = sk->sk_mark;
162 fl6.fl6_dport = inet->inet_dport;
163 fl6.fl6_sport = inet->inet_sport;
164
165 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
166 fl6.flowi6_oif = np->mcast_oif;
167
168 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
169
170 rcu_read_lock();
171 opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt);
172 final_p = fl6_update_dst(&fl6, opt, &final);
173 rcu_read_unlock();
174
175 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
176 err = 0;
177 if (IS_ERR(dst)) {
178 err = PTR_ERR(dst);
179 goto out;
180 }
181
182 /* source address lookup done in ip6_dst_lookup */
183
184 if (ipv6_addr_any(&np->saddr))
185 np->saddr = fl6.saddr;
186
187 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
188 sk->sk_v6_rcv_saddr = fl6.saddr;
189 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
190 if (sk->sk_prot->rehash)
191 sk->sk_prot->rehash(sk);
192 }
193
194 ip6_dst_store(sk, dst,
195 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
196 &sk->sk_v6_daddr : NULL,
197 #ifdef CONFIG_IPV6_SUBTREES
198 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
199 &np->saddr :
200 #endif
201 NULL);
202
203 sk->sk_state = TCP_ESTABLISHED;
204 sk_set_txhash(sk);
205 out:
206 fl6_sock_release(flowlabel);
207 return err;
208 }
209
210 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
211 {
212 int res;
213
214 lock_sock(sk);
215 res = __ip6_datagram_connect(sk, uaddr, addr_len);
216 release_sock(sk);
217 return res;
218 }
219 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
220
221 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
222 int addr_len)
223 {
224 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
225 if (sin6->sin6_family != AF_INET6)
226 return -EAFNOSUPPORT;
227 return ip6_datagram_connect(sk, uaddr, addr_len);
228 }
229 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
230
231 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
232 __be16 port, u32 info, u8 *payload)
233 {
234 struct ipv6_pinfo *np = inet6_sk(sk);
235 struct icmp6hdr *icmph = icmp6_hdr(skb);
236 struct sock_exterr_skb *serr;
237
238 if (!np->recverr)
239 return;
240
241 skb = skb_clone(skb, GFP_ATOMIC);
242 if (!skb)
243 return;
244
245 skb->protocol = htons(ETH_P_IPV6);
246
247 serr = SKB_EXT_ERR(skb);
248 serr->ee.ee_errno = err;
249 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
250 serr->ee.ee_type = icmph->icmp6_type;
251 serr->ee.ee_code = icmph->icmp6_code;
252 serr->ee.ee_pad = 0;
253 serr->ee.ee_info = info;
254 serr->ee.ee_data = 0;
255 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
256 skb_network_header(skb);
257 serr->port = port;
258
259 __skb_pull(skb, payload - skb->data);
260 skb_reset_transport_header(skb);
261
262 if (sock_queue_err_skb(sk, skb))
263 kfree_skb(skb);
264 }
265
266 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
267 {
268 const struct ipv6_pinfo *np = inet6_sk(sk);
269 struct sock_exterr_skb *serr;
270 struct ipv6hdr *iph;
271 struct sk_buff *skb;
272
273 if (!np->recverr)
274 return;
275
276 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
277 if (!skb)
278 return;
279
280 skb->protocol = htons(ETH_P_IPV6);
281
282 skb_put(skb, sizeof(struct ipv6hdr));
283 skb_reset_network_header(skb);
284 iph = ipv6_hdr(skb);
285 iph->daddr = fl6->daddr;
286
287 serr = SKB_EXT_ERR(skb);
288 serr->ee.ee_errno = err;
289 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
290 serr->ee.ee_type = 0;
291 serr->ee.ee_code = 0;
292 serr->ee.ee_pad = 0;
293 serr->ee.ee_info = info;
294 serr->ee.ee_data = 0;
295 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
296 serr->port = fl6->fl6_dport;
297
298 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
299 skb_reset_transport_header(skb);
300
301 if (sock_queue_err_skb(sk, skb))
302 kfree_skb(skb);
303 }
304
305 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
306 {
307 struct ipv6_pinfo *np = inet6_sk(sk);
308 struct ipv6hdr *iph;
309 struct sk_buff *skb;
310 struct ip6_mtuinfo *mtu_info;
311
312 if (!np->rxopt.bits.rxpmtu)
313 return;
314
315 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
316 if (!skb)
317 return;
318
319 skb_put(skb, sizeof(struct ipv6hdr));
320 skb_reset_network_header(skb);
321 iph = ipv6_hdr(skb);
322 iph->daddr = fl6->daddr;
323
324 mtu_info = IP6CBMTU(skb);
325
326 mtu_info->ip6m_mtu = mtu;
327 mtu_info->ip6m_addr.sin6_family = AF_INET6;
328 mtu_info->ip6m_addr.sin6_port = 0;
329 mtu_info->ip6m_addr.sin6_flowinfo = 0;
330 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
331 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
332
333 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
334 skb_reset_transport_header(skb);
335
336 skb = xchg(&np->rxpmtu, skb);
337 kfree_skb(skb);
338 }
339
340 /* For some errors we have valid addr_offset even with zero payload and
341 * zero port. Also, addr_offset should be supported if port is set.
342 */
343 static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
344 {
345 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
346 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
347 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
348 }
349
350 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
351 *
352 * At one point, excluding local errors was a quick test to identify icmp/icmp6
353 * errors. This is no longer true, but the test remained, so the v6 stack,
354 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
355 *
356 * Timestamp code paths do not initialize the fields expected by cmsg:
357 * the PKTINFO fields in skb->cb[]. Fill those in here.
358 */
359 static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
360 struct sock_exterr_skb *serr)
361 {
362 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
363 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
364 return true;
365
366 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
367 return false;
368
369 if (!skb->dev)
370 return false;
371
372 if (skb->protocol == htons(ETH_P_IPV6))
373 IP6CB(skb)->iif = skb->dev->ifindex;
374 else
375 PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex;
376
377 return true;
378 }
379
380 /*
381 * Handle MSG_ERRQUEUE
382 */
383 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
384 {
385 struct ipv6_pinfo *np = inet6_sk(sk);
386 struct sock_exterr_skb *serr;
387 struct sk_buff *skb;
388 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
389 struct {
390 struct sock_extended_err ee;
391 struct sockaddr_in6 offender;
392 } errhdr;
393 int err;
394 int copied;
395
396 err = -EAGAIN;
397 skb = sock_dequeue_err_skb(sk);
398 if (!skb)
399 goto out;
400
401 copied = skb->len;
402 if (copied > len) {
403 msg->msg_flags |= MSG_TRUNC;
404 copied = len;
405 }
406 err = skb_copy_datagram_msg(skb, 0, msg, copied);
407 if (err)
408 goto out_free_skb;
409
410 sock_recv_timestamp(msg, sk, skb);
411
412 serr = SKB_EXT_ERR(skb);
413
414 if (sin && ipv6_datagram_support_addr(serr)) {
415 const unsigned char *nh = skb_network_header(skb);
416 sin->sin6_family = AF_INET6;
417 sin->sin6_flowinfo = 0;
418 sin->sin6_port = serr->port;
419 if (skb->protocol == htons(ETH_P_IPV6)) {
420 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
421 struct ipv6hdr, daddr);
422 sin->sin6_addr = ip6h->daddr;
423 if (np->sndflow)
424 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
425 sin->sin6_scope_id =
426 ipv6_iface_scope_id(&sin->sin6_addr,
427 IP6CB(skb)->iif);
428 } else {
429 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
430 &sin->sin6_addr);
431 sin->sin6_scope_id = 0;
432 }
433 *addr_len = sizeof(*sin);
434 }
435
436 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
437 sin = &errhdr.offender;
438 memset(sin, 0, sizeof(*sin));
439
440 if (ip6_datagram_support_cmsg(skb, serr)) {
441 sin->sin6_family = AF_INET6;
442 if (np->rxopt.all)
443 ip6_datagram_recv_common_ctl(sk, msg, skb);
444 if (skb->protocol == htons(ETH_P_IPV6)) {
445 sin->sin6_addr = ipv6_hdr(skb)->saddr;
446 if (np->rxopt.all)
447 ip6_datagram_recv_specific_ctl(sk, msg, skb);
448 sin->sin6_scope_id =
449 ipv6_iface_scope_id(&sin->sin6_addr,
450 IP6CB(skb)->iif);
451 } else {
452 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
453 &sin->sin6_addr);
454 if (inet_sk(sk)->cmsg_flags)
455 ip_cmsg_recv(msg, skb);
456 }
457 }
458
459 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
460
461 /* Now we could try to dump offended packet options */
462
463 msg->msg_flags |= MSG_ERRQUEUE;
464 err = copied;
465
466 out_free_skb:
467 kfree_skb(skb);
468 out:
469 return err;
470 }
471 EXPORT_SYMBOL_GPL(ipv6_recv_error);
472
473 /*
474 * Handle IPV6_RECVPATHMTU
475 */
476 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
477 int *addr_len)
478 {
479 struct ipv6_pinfo *np = inet6_sk(sk);
480 struct sk_buff *skb;
481 struct ip6_mtuinfo mtu_info;
482 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
483 int err;
484 int copied;
485
486 err = -EAGAIN;
487 skb = xchg(&np->rxpmtu, NULL);
488 if (!skb)
489 goto out;
490
491 copied = skb->len;
492 if (copied > len) {
493 msg->msg_flags |= MSG_TRUNC;
494 copied = len;
495 }
496 err = skb_copy_datagram_msg(skb, 0, msg, copied);
497 if (err)
498 goto out_free_skb;
499
500 sock_recv_timestamp(msg, sk, skb);
501
502 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
503
504 if (sin) {
505 sin->sin6_family = AF_INET6;
506 sin->sin6_flowinfo = 0;
507 sin->sin6_port = 0;
508 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
509 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
510 *addr_len = sizeof(*sin);
511 }
512
513 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
514
515 err = copied;
516
517 out_free_skb:
518 kfree_skb(skb);
519 out:
520 return err;
521 }
522
523
524 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
525 struct sk_buff *skb)
526 {
527 struct ipv6_pinfo *np = inet6_sk(sk);
528 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
529
530 if (np->rxopt.bits.rxinfo) {
531 struct in6_pktinfo src_info;
532
533 if (is_ipv6) {
534 src_info.ipi6_ifindex = IP6CB(skb)->iif;
535 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
536 } else {
537 src_info.ipi6_ifindex =
538 PKTINFO_SKB_CB(skb)->ipi_ifindex;
539 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
540 &src_info.ipi6_addr);
541 }
542
543 if (src_info.ipi6_ifindex >= 0)
544 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
545 sizeof(src_info), &src_info);
546 }
547 }
548
549 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
550 struct sk_buff *skb)
551 {
552 struct ipv6_pinfo *np = inet6_sk(sk);
553 struct inet6_skb_parm *opt = IP6CB(skb);
554 unsigned char *nh = skb_network_header(skb);
555
556 if (np->rxopt.bits.rxhlim) {
557 int hlim = ipv6_hdr(skb)->hop_limit;
558 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
559 }
560
561 if (np->rxopt.bits.rxtclass) {
562 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
563 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
564 }
565
566 if (np->rxopt.bits.rxflow) {
567 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
568 if (flowinfo)
569 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
570 }
571
572 /* HbH is allowed only once */
573 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
574 u8 *ptr = nh + sizeof(struct ipv6hdr);
575 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
576 }
577
578 if (opt->lastopt &&
579 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
580 /*
581 * Silly enough, but we need to reparse in order to
582 * report extension headers (except for HbH)
583 * in order.
584 *
585 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
586 * (and WILL NOT be) defined because
587 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
588 */
589 unsigned int off = sizeof(struct ipv6hdr);
590 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
591
592 while (off <= opt->lastopt) {
593 unsigned int len;
594 u8 *ptr = nh + off;
595
596 switch (nexthdr) {
597 case IPPROTO_DSTOPTS:
598 nexthdr = ptr[0];
599 len = (ptr[1] + 1) << 3;
600 if (np->rxopt.bits.dstopts)
601 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
602 break;
603 case IPPROTO_ROUTING:
604 nexthdr = ptr[0];
605 len = (ptr[1] + 1) << 3;
606 if (np->rxopt.bits.srcrt)
607 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
608 break;
609 case IPPROTO_AH:
610 nexthdr = ptr[0];
611 len = (ptr[1] + 2) << 2;
612 break;
613 default:
614 nexthdr = ptr[0];
615 len = (ptr[1] + 1) << 3;
616 break;
617 }
618
619 off += len;
620 }
621 }
622
623 /* socket options in old style */
624 if (np->rxopt.bits.rxoinfo) {
625 struct in6_pktinfo src_info;
626
627 src_info.ipi6_ifindex = opt->iif;
628 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
629 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
630 }
631 if (np->rxopt.bits.rxohlim) {
632 int hlim = ipv6_hdr(skb)->hop_limit;
633 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
634 }
635 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
636 u8 *ptr = nh + sizeof(struct ipv6hdr);
637 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
638 }
639 if (np->rxopt.bits.odstopts && opt->dst0) {
640 u8 *ptr = nh + opt->dst0;
641 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
642 }
643 if (np->rxopt.bits.osrcrt && opt->srcrt) {
644 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
645 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
646 }
647 if (np->rxopt.bits.odstopts && opt->dst1) {
648 u8 *ptr = nh + opt->dst1;
649 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
650 }
651 if (np->rxopt.bits.rxorigdstaddr) {
652 struct sockaddr_in6 sin6;
653 __be16 *ports = (__be16 *) skb_transport_header(skb);
654
655 if (skb_transport_offset(skb) + 4 <= skb->len) {
656 /* All current transport protocols have the port numbers in the
657 * first four bytes of the transport header and this function is
658 * written with this assumption in mind.
659 */
660
661 sin6.sin6_family = AF_INET6;
662 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
663 sin6.sin6_port = ports[1];
664 sin6.sin6_flowinfo = 0;
665 sin6.sin6_scope_id =
666 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
667 opt->iif);
668
669 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
670 }
671 }
672 }
673
674 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
675 struct sk_buff *skb)
676 {
677 ip6_datagram_recv_common_ctl(sk, msg, skb);
678 ip6_datagram_recv_specific_ctl(sk, msg, skb);
679 }
680 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
681
682 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
683 struct msghdr *msg, struct flowi6 *fl6,
684 struct ipv6_txoptions *opt,
685 int *hlimit, int *tclass, int *dontfrag)
686 {
687 struct in6_pktinfo *src_info;
688 struct cmsghdr *cmsg;
689 struct ipv6_rt_hdr *rthdr;
690 struct ipv6_opt_hdr *hdr;
691 int len;
692 int err = 0;
693
694 for_each_cmsghdr(cmsg, msg) {
695 int addr_type;
696
697 if (!CMSG_OK(msg, cmsg)) {
698 err = -EINVAL;
699 goto exit_f;
700 }
701
702 if (cmsg->cmsg_level != SOL_IPV6)
703 continue;
704
705 switch (cmsg->cmsg_type) {
706 case IPV6_PKTINFO:
707 case IPV6_2292PKTINFO:
708 {
709 struct net_device *dev = NULL;
710
711 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
712 err = -EINVAL;
713 goto exit_f;
714 }
715
716 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
717
718 if (src_info->ipi6_ifindex) {
719 if (fl6->flowi6_oif &&
720 src_info->ipi6_ifindex != fl6->flowi6_oif)
721 return -EINVAL;
722 fl6->flowi6_oif = src_info->ipi6_ifindex;
723 }
724
725 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
726
727 rcu_read_lock();
728 if (fl6->flowi6_oif) {
729 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
730 if (!dev) {
731 rcu_read_unlock();
732 return -ENODEV;
733 }
734 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
735 rcu_read_unlock();
736 return -EINVAL;
737 }
738
739 if (addr_type != IPV6_ADDR_ANY) {
740 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
741 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
742 !ipv6_chk_addr(net, &src_info->ipi6_addr,
743 strict ? dev : NULL, 0) &&
744 !ipv6_chk_acast_addr_src(net, dev,
745 &src_info->ipi6_addr))
746 err = -EINVAL;
747 else
748 fl6->saddr = src_info->ipi6_addr;
749 }
750
751 rcu_read_unlock();
752
753 if (err)
754 goto exit_f;
755
756 break;
757 }
758
759 case IPV6_FLOWINFO:
760 if (cmsg->cmsg_len < CMSG_LEN(4)) {
761 err = -EINVAL;
762 goto exit_f;
763 }
764
765 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
766 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
767 err = -EINVAL;
768 goto exit_f;
769 }
770 }
771 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
772 break;
773
774 case IPV6_2292HOPOPTS:
775 case IPV6_HOPOPTS:
776 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
777 err = -EINVAL;
778 goto exit_f;
779 }
780
781 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
782 len = ((hdr->hdrlen + 1) << 3);
783 if (cmsg->cmsg_len < CMSG_LEN(len)) {
784 err = -EINVAL;
785 goto exit_f;
786 }
787 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
788 err = -EPERM;
789 goto exit_f;
790 }
791 opt->opt_nflen += len;
792 opt->hopopt = hdr;
793 break;
794
795 case IPV6_2292DSTOPTS:
796 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
797 err = -EINVAL;
798 goto exit_f;
799 }
800
801 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
802 len = ((hdr->hdrlen + 1) << 3);
803 if (cmsg->cmsg_len < CMSG_LEN(len)) {
804 err = -EINVAL;
805 goto exit_f;
806 }
807 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
808 err = -EPERM;
809 goto exit_f;
810 }
811 if (opt->dst1opt) {
812 err = -EINVAL;
813 goto exit_f;
814 }
815 opt->opt_flen += len;
816 opt->dst1opt = hdr;
817 break;
818
819 case IPV6_DSTOPTS:
820 case IPV6_RTHDRDSTOPTS:
821 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
822 err = -EINVAL;
823 goto exit_f;
824 }
825
826 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
827 len = ((hdr->hdrlen + 1) << 3);
828 if (cmsg->cmsg_len < CMSG_LEN(len)) {
829 err = -EINVAL;
830 goto exit_f;
831 }
832 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
833 err = -EPERM;
834 goto exit_f;
835 }
836 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
837 opt->opt_flen += len;
838 opt->dst1opt = hdr;
839 } else {
840 opt->opt_nflen += len;
841 opt->dst0opt = hdr;
842 }
843 break;
844
845 case IPV6_2292RTHDR:
846 case IPV6_RTHDR:
847 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
848 err = -EINVAL;
849 goto exit_f;
850 }
851
852 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
853
854 switch (rthdr->type) {
855 #if IS_ENABLED(CONFIG_IPV6_MIP6)
856 case IPV6_SRCRT_TYPE_2:
857 if (rthdr->hdrlen != 2 ||
858 rthdr->segments_left != 1) {
859 err = -EINVAL;
860 goto exit_f;
861 }
862 break;
863 #endif
864 default:
865 err = -EINVAL;
866 goto exit_f;
867 }
868
869 len = ((rthdr->hdrlen + 1) << 3);
870
871 if (cmsg->cmsg_len < CMSG_LEN(len)) {
872 err = -EINVAL;
873 goto exit_f;
874 }
875
876 /* segments left must also match */
877 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
878 err = -EINVAL;
879 goto exit_f;
880 }
881
882 opt->opt_nflen += len;
883 opt->srcrt = rthdr;
884
885 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
886 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
887
888 opt->opt_nflen += dsthdrlen;
889 opt->dst0opt = opt->dst1opt;
890 opt->dst1opt = NULL;
891 opt->opt_flen -= dsthdrlen;
892 }
893
894 break;
895
896 case IPV6_2292HOPLIMIT:
897 case IPV6_HOPLIMIT:
898 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
899 err = -EINVAL;
900 goto exit_f;
901 }
902
903 *hlimit = *(int *)CMSG_DATA(cmsg);
904 if (*hlimit < -1 || *hlimit > 0xff) {
905 err = -EINVAL;
906 goto exit_f;
907 }
908
909 break;
910
911 case IPV6_TCLASS:
912 {
913 int tc;
914
915 err = -EINVAL;
916 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
917 goto exit_f;
918
919 tc = *(int *)CMSG_DATA(cmsg);
920 if (tc < -1 || tc > 0xff)
921 goto exit_f;
922
923 err = 0;
924 *tclass = tc;
925
926 break;
927 }
928
929 case IPV6_DONTFRAG:
930 {
931 int df;
932
933 err = -EINVAL;
934 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
935 goto exit_f;
936
937 df = *(int *)CMSG_DATA(cmsg);
938 if (df < 0 || df > 1)
939 goto exit_f;
940
941 err = 0;
942 *dontfrag = df;
943
944 break;
945 }
946 default:
947 net_dbg_ratelimited("invalid cmsg type: %d\n",
948 cmsg->cmsg_type);
949 err = -EINVAL;
950 goto exit_f;
951 }
952 }
953
954 exit_f:
955 return err;
956 }
957 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
958
959 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
960 __u16 srcp, __u16 destp, int bucket)
961 {
962 const struct in6_addr *dest, *src;
963
964 dest = &sp->sk_v6_daddr;
965 src = &sp->sk_v6_rcv_saddr;
966 seq_printf(seq,
967 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
968 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
969 bucket,
970 src->s6_addr32[0], src->s6_addr32[1],
971 src->s6_addr32[2], src->s6_addr32[3], srcp,
972 dest->s6_addr32[0], dest->s6_addr32[1],
973 dest->s6_addr32[2], dest->s6_addr32[3], destp,
974 sp->sk_state,
975 sk_wmem_alloc_get(sp),
976 sk_rmem_alloc_get(sp),
977 0, 0L, 0,
978 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
979 0,
980 sock_i_ino(sp),
981 atomic_read(&sp->sk_refcnt), sp,
982 atomic_read(&sp->sk_drops));
983 }
Linux kernel - Deliverables
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