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media: cpia2_usb: drop bogus interface-release call
[linux/fpc-iii.git] / net / ipv6 / datagram.c
blobfbf08ce3f5ab75c3d21c20741421f4153c4dcd67
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 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
200 ipv4_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 sk->sk_bound_dev_if = usin->sin6_scope_id;
229 }
230
231 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
232 sk->sk_bound_dev_if = 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 sk->sk_v6_daddr = *daddr;
242 np->flow_label = fl6_flowlabel;
243
244 inet->inet_dport = usin->sin6_port;
245
246 /*
247 * Check for a route to destination an obtain the
248 * destination cache for it.
249 */
250
251 err = ip6_datagram_dst_update(sk, true);
252 if (err) {
253 /* Reset daddr and dport so that udp_v6_early_demux()
254 * fails to find this socket
255 */
256 memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr));
257 inet->inet_dport = 0;
258 goto out;
259 }
260
261 sk->sk_state = TCP_ESTABLISHED;
262 sk_set_txhash(sk);
263 out:
264 return err;
265 }
266 EXPORT_SYMBOL_GPL(__ip6_datagram_connect);
267
268 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
269 {
270 int res;
271
272 lock_sock(sk);
273 res = __ip6_datagram_connect(sk, uaddr, addr_len);
274 release_sock(sk);
275 return res;
276 }
277 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
278
279 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
280 int addr_len)
281 {
282 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
283 if (sin6->sin6_family != AF_INET6)
284 return -EAFNOSUPPORT;
285 return ip6_datagram_connect(sk, uaddr, addr_len);
286 }
287 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
288
289 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
290 __be16 port, u32 info, u8 *payload)
291 {
292 struct ipv6_pinfo *np = inet6_sk(sk);
293 struct icmp6hdr *icmph = icmp6_hdr(skb);
294 struct sock_exterr_skb *serr;
295
296 if (!np->recverr)
297 return;
298
299 skb = skb_clone(skb, GFP_ATOMIC);
300 if (!skb)
301 return;
302
303 skb->protocol = htons(ETH_P_IPV6);
304
305 serr = SKB_EXT_ERR(skb);
306 serr->ee.ee_errno = err;
307 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
308 serr->ee.ee_type = icmph->icmp6_type;
309 serr->ee.ee_code = icmph->icmp6_code;
310 serr->ee.ee_pad = 0;
311 serr->ee.ee_info = info;
312 serr->ee.ee_data = 0;
313 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
314 skb_network_header(skb);
315 serr->port = port;
316
317 __skb_pull(skb, payload - skb->data);
318 skb_reset_transport_header(skb);
319
320 if (sock_queue_err_skb(sk, skb))
321 kfree_skb(skb);
322 }
323
324 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
325 {
326 const struct ipv6_pinfo *np = inet6_sk(sk);
327 struct sock_exterr_skb *serr;
328 struct ipv6hdr *iph;
329 struct sk_buff *skb;
330
331 if (!np->recverr)
332 return;
333
334 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
335 if (!skb)
336 return;
337
338 skb->protocol = htons(ETH_P_IPV6);
339
340 skb_put(skb, sizeof(struct ipv6hdr));
341 skb_reset_network_header(skb);
342 iph = ipv6_hdr(skb);
343 iph->daddr = fl6->daddr;
344
345 serr = SKB_EXT_ERR(skb);
346 serr->ee.ee_errno = err;
347 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
348 serr->ee.ee_type = 0;
349 serr->ee.ee_code = 0;
350 serr->ee.ee_pad = 0;
351 serr->ee.ee_info = info;
352 serr->ee.ee_data = 0;
353 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
354 serr->port = fl6->fl6_dport;
355
356 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
357 skb_reset_transport_header(skb);
358
359 if (sock_queue_err_skb(sk, skb))
360 kfree_skb(skb);
361 }
362
363 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
364 {
365 struct ipv6_pinfo *np = inet6_sk(sk);
366 struct ipv6hdr *iph;
367 struct sk_buff *skb;
368 struct ip6_mtuinfo *mtu_info;
369
370 if (!np->rxopt.bits.rxpmtu)
371 return;
372
373 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
374 if (!skb)
375 return;
376
377 skb_put(skb, sizeof(struct ipv6hdr));
378 skb_reset_network_header(skb);
379 iph = ipv6_hdr(skb);
380 iph->daddr = fl6->daddr;
381
382 mtu_info = IP6CBMTU(skb);
383
384 mtu_info->ip6m_mtu = mtu;
385 mtu_info->ip6m_addr.sin6_family = AF_INET6;
386 mtu_info->ip6m_addr.sin6_port = 0;
387 mtu_info->ip6m_addr.sin6_flowinfo = 0;
388 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
389 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
390
391 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
392 skb_reset_transport_header(skb);
393
394 skb = xchg(&np->rxpmtu, skb);
395 kfree_skb(skb);
396 }
397
398 /* For some errors we have valid addr_offset even with zero payload and
399 * zero port. Also, addr_offset should be supported if port is set.
400 */
401 static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
402 {
403 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
404 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
405 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
406 }
407
408 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
409 *
410 * At one point, excluding local errors was a quick test to identify icmp/icmp6
411 * errors. This is no longer true, but the test remained, so the v6 stack,
412 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
413 */
414 static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
415 struct sock_exterr_skb *serr)
416 {
417 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
418 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
419 return true;
420
421 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
422 return false;
423
424 if (!IP6CB(skb)->iif)
425 return false;
426
427 return true;
428 }
429
430 /*
431 * Handle MSG_ERRQUEUE
432 */
433 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
434 {
435 struct ipv6_pinfo *np = inet6_sk(sk);
436 struct sock_exterr_skb *serr;
437 struct sk_buff *skb;
438 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
439 struct {
440 struct sock_extended_err ee;
441 struct sockaddr_in6 offender;
442 } errhdr;
443 int err;
444 int copied;
445
446 err = -EAGAIN;
447 skb = sock_dequeue_err_skb(sk);
448 if (!skb)
449 goto out;
450
451 copied = skb->len;
452 if (copied > len) {
453 msg->msg_flags |= MSG_TRUNC;
454 copied = len;
455 }
456 err = skb_copy_datagram_msg(skb, 0, msg, copied);
457 if (unlikely(err)) {
458 kfree_skb(skb);
459 return err;
460 }
461 sock_recv_timestamp(msg, sk, skb);
462
463 serr = SKB_EXT_ERR(skb);
464
465 if (sin && ipv6_datagram_support_addr(serr)) {
466 const unsigned char *nh = skb_network_header(skb);
467 sin->sin6_family = AF_INET6;
468 sin->sin6_flowinfo = 0;
469 sin->sin6_port = serr->port;
470 if (skb->protocol == htons(ETH_P_IPV6)) {
471 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
472 struct ipv6hdr, daddr);
473 sin->sin6_addr = ip6h->daddr;
474 if (np->sndflow)
475 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
476 sin->sin6_scope_id =
477 ipv6_iface_scope_id(&sin->sin6_addr,
478 IP6CB(skb)->iif);
479 } else {
480 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
481 &sin->sin6_addr);
482 sin->sin6_scope_id = 0;
483 }
484 *addr_len = sizeof(*sin);
485 }
486
487 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
488 sin = &errhdr.offender;
489 memset(sin, 0, sizeof(*sin));
490
491 if (ip6_datagram_support_cmsg(skb, serr)) {
492 sin->sin6_family = AF_INET6;
493 if (np->rxopt.all)
494 ip6_datagram_recv_common_ctl(sk, msg, skb);
495 if (skb->protocol == htons(ETH_P_IPV6)) {
496 sin->sin6_addr = ipv6_hdr(skb)->saddr;
497 if (np->rxopt.all)
498 ip6_datagram_recv_specific_ctl(sk, msg, skb);
499 sin->sin6_scope_id =
500 ipv6_iface_scope_id(&sin->sin6_addr,
501 IP6CB(skb)->iif);
502 } else {
503 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
504 &sin->sin6_addr);
505 if (inet_sk(sk)->cmsg_flags)
506 ip_cmsg_recv(msg, skb);
507 }
508 }
509
510 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
511
512 /* Now we could try to dump offended packet options */
513
514 msg->msg_flags |= MSG_ERRQUEUE;
515 err = copied;
516
517 consume_skb(skb);
518 out:
519 return err;
520 }
521 EXPORT_SYMBOL_GPL(ipv6_recv_error);
522
523 /*
524 * Handle IPV6_RECVPATHMTU
525 */
526 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
527 int *addr_len)
528 {
529 struct ipv6_pinfo *np = inet6_sk(sk);
530 struct sk_buff *skb;
531 struct ip6_mtuinfo mtu_info;
532 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
533 int err;
534 int copied;
535
536 err = -EAGAIN;
537 skb = xchg(&np->rxpmtu, NULL);
538 if (!skb)
539 goto out;
540
541 copied = skb->len;
542 if (copied > len) {
543 msg->msg_flags |= MSG_TRUNC;
544 copied = len;
545 }
546 err = skb_copy_datagram_msg(skb, 0, msg, copied);
547 if (err)
548 goto out_free_skb;
549
550 sock_recv_timestamp(msg, sk, skb);
551
552 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
553
554 if (sin) {
555 sin->sin6_family = AF_INET6;
556 sin->sin6_flowinfo = 0;
557 sin->sin6_port = 0;
558 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
559 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
560 *addr_len = sizeof(*sin);
561 }
562
563 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
564
565 err = copied;
566
567 out_free_skb:
568 kfree_skb(skb);
569 out:
570 return err;
571 }
572
573
574 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
575 struct sk_buff *skb)
576 {
577 struct ipv6_pinfo *np = inet6_sk(sk);
578 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
579
580 if (np->rxopt.bits.rxinfo) {
581 struct in6_pktinfo src_info;
582
583 if (is_ipv6) {
584 src_info.ipi6_ifindex = IP6CB(skb)->iif;
585 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
586 } else {
587 src_info.ipi6_ifindex =
588 PKTINFO_SKB_CB(skb)->ipi_ifindex;
589 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
590 &src_info.ipi6_addr);
591 }
592
593 if (src_info.ipi6_ifindex >= 0)
594 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
595 sizeof(src_info), &src_info);
596 }
597 }
598
599 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
600 struct sk_buff *skb)
601 {
602 struct ipv6_pinfo *np = inet6_sk(sk);
603 struct inet6_skb_parm *opt = IP6CB(skb);
604 unsigned char *nh = skb_network_header(skb);
605
606 if (np->rxopt.bits.rxhlim) {
607 int hlim = ipv6_hdr(skb)->hop_limit;
608 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
609 }
610
611 if (np->rxopt.bits.rxtclass) {
612 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
613 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
614 }
615
616 if (np->rxopt.bits.rxflow) {
617 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
618 if (flowinfo)
619 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
620 }
621
622 /* HbH is allowed only once */
623 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
624 u8 *ptr = nh + sizeof(struct ipv6hdr);
625 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
626 }
627
628 if (opt->lastopt &&
629 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
630 /*
631 * Silly enough, but we need to reparse in order to
632 * report extension headers (except for HbH)
633 * in order.
634 *
635 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
636 * (and WILL NOT be) defined because
637 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
638 */
639 unsigned int off = sizeof(struct ipv6hdr);
640 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
641
642 while (off <= opt->lastopt) {
643 unsigned int len;
644 u8 *ptr = nh + off;
645
646 switch (nexthdr) {
647 case IPPROTO_DSTOPTS:
648 nexthdr = ptr[0];
649 len = (ptr[1] + 1) << 3;
650 if (np->rxopt.bits.dstopts)
651 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
652 break;
653 case IPPROTO_ROUTING:
654 nexthdr = ptr[0];
655 len = (ptr[1] + 1) << 3;
656 if (np->rxopt.bits.srcrt)
657 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
658 break;
659 case IPPROTO_AH:
660 nexthdr = ptr[0];
661 len = (ptr[1] + 2) << 2;
662 break;
663 default:
664 nexthdr = ptr[0];
665 len = (ptr[1] + 1) << 3;
666 break;
667 }
668
669 off += len;
670 }
671 }
672
673 /* socket options in old style */
674 if (np->rxopt.bits.rxoinfo) {
675 struct in6_pktinfo src_info;
676
677 src_info.ipi6_ifindex = opt->iif;
678 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
679 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
680 }
681 if (np->rxopt.bits.rxohlim) {
682 int hlim = ipv6_hdr(skb)->hop_limit;
683 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
684 }
685 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
686 u8 *ptr = nh + sizeof(struct ipv6hdr);
687 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
688 }
689 if (np->rxopt.bits.odstopts && opt->dst0) {
690 u8 *ptr = nh + opt->dst0;
691 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
692 }
693 if (np->rxopt.bits.osrcrt && opt->srcrt) {
694 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
695 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
696 }
697 if (np->rxopt.bits.odstopts && opt->dst1) {
698 u8 *ptr = nh + opt->dst1;
699 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
700 }
701 if (np->rxopt.bits.rxorigdstaddr) {
702 struct sockaddr_in6 sin6;
703 __be16 *ports = (__be16 *) skb_transport_header(skb);
704
705 if (skb_transport_offset(skb) + 4 <= (int)skb->len) {
706 /* All current transport protocols have the port numbers in the
707 * first four bytes of the transport header and this function is
708 * written with this assumption in mind.
709 */
710
711 sin6.sin6_family = AF_INET6;
712 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
713 sin6.sin6_port = ports[1];
714 sin6.sin6_flowinfo = 0;
715 sin6.sin6_scope_id =
716 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
717 opt->iif);
718
719 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
720 }
721 }
722 if (np->rxopt.bits.recvfragsize && opt->frag_max_size) {
723 int val = opt->frag_max_size;
724
725 put_cmsg(msg, SOL_IPV6, IPV6_RECVFRAGSIZE, sizeof(val), &val);
726 }
727 }
728
729 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
730 struct sk_buff *skb)
731 {
732 ip6_datagram_recv_common_ctl(sk, msg, skb);
733 ip6_datagram_recv_specific_ctl(sk, msg, skb);
734 }
735 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
736
737 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
738 struct msghdr *msg, struct flowi6 *fl6,
739 struct ipcm6_cookie *ipc6, struct sockcm_cookie *sockc)
740 {
741 struct in6_pktinfo *src_info;
742 struct cmsghdr *cmsg;
743 struct ipv6_rt_hdr *rthdr;
744 struct ipv6_opt_hdr *hdr;
745 struct ipv6_txoptions *opt = ipc6->opt;
746 int len;
747 int err = 0;
748
749 for_each_cmsghdr(cmsg, msg) {
750 int addr_type;
751
752 if (!CMSG_OK(msg, cmsg)) {
753 err = -EINVAL;
754 goto exit_f;
755 }
756
757 if (cmsg->cmsg_level == SOL_SOCKET) {
758 err = __sock_cmsg_send(sk, msg, cmsg, sockc);
759 if (err)
760 return err;
761 continue;
762 }
763
764 if (cmsg->cmsg_level != SOL_IPV6)
765 continue;
766
767 switch (cmsg->cmsg_type) {
768 case IPV6_PKTINFO:
769 case IPV6_2292PKTINFO:
770 {
771 struct net_device *dev = NULL;
772
773 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
774 err = -EINVAL;
775 goto exit_f;
776 }
777
778 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
779
780 if (src_info->ipi6_ifindex) {
781 if (fl6->flowi6_oif &&
782 src_info->ipi6_ifindex != fl6->flowi6_oif)
783 return -EINVAL;
784 fl6->flowi6_oif = src_info->ipi6_ifindex;
785 }
786
787 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
788
789 rcu_read_lock();
790 if (fl6->flowi6_oif) {
791 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
792 if (!dev) {
793 rcu_read_unlock();
794 return -ENODEV;
795 }
796 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
797 rcu_read_unlock();
798 return -EINVAL;
799 }
800
801 if (addr_type != IPV6_ADDR_ANY) {
802 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
803 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
804 !ipv6_chk_addr(net, &src_info->ipi6_addr,
805 strict ? dev : NULL, 0) &&
806 !ipv6_chk_acast_addr_src(net, dev,
807 &src_info->ipi6_addr))
808 err = -EINVAL;
809 else
810 fl6->saddr = src_info->ipi6_addr;
811 }
812
813 rcu_read_unlock();
814
815 if (err)
816 goto exit_f;
817
818 break;
819 }
820
821 case IPV6_FLOWINFO:
822 if (cmsg->cmsg_len < CMSG_LEN(4)) {
823 err = -EINVAL;
824 goto exit_f;
825 }
826
827 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
828 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
829 err = -EINVAL;
830 goto exit_f;
831 }
832 }
833 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
834 break;
835
836 case IPV6_2292HOPOPTS:
837 case IPV6_HOPOPTS:
838 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
839 err = -EINVAL;
840 goto exit_f;
841 }
842
843 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
844 len = ((hdr->hdrlen + 1) << 3);
845 if (cmsg->cmsg_len < CMSG_LEN(len)) {
846 err = -EINVAL;
847 goto exit_f;
848 }
849 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
850 err = -EPERM;
851 goto exit_f;
852 }
853 opt->opt_nflen += len;
854 opt->hopopt = hdr;
855 break;
856
857 case IPV6_2292DSTOPTS:
858 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
859 err = -EINVAL;
860 goto exit_f;
861 }
862
863 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
864 len = ((hdr->hdrlen + 1) << 3);
865 if (cmsg->cmsg_len < CMSG_LEN(len)) {
866 err = -EINVAL;
867 goto exit_f;
868 }
869 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
870 err = -EPERM;
871 goto exit_f;
872 }
873 if (opt->dst1opt) {
874 err = -EINVAL;
875 goto exit_f;
876 }
877 opt->opt_flen += len;
878 opt->dst1opt = hdr;
879 break;
880
881 case IPV6_DSTOPTS:
882 case IPV6_RTHDRDSTOPTS:
883 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
884 err = -EINVAL;
885 goto exit_f;
886 }
887
888 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
889 len = ((hdr->hdrlen + 1) << 3);
890 if (cmsg->cmsg_len < CMSG_LEN(len)) {
891 err = -EINVAL;
892 goto exit_f;
893 }
894 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
895 err = -EPERM;
896 goto exit_f;
897 }
898 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
899 opt->opt_flen += len;
900 opt->dst1opt = hdr;
901 } else {
902 opt->opt_nflen += len;
903 opt->dst0opt = hdr;
904 }
905 break;
906
907 case IPV6_2292RTHDR:
908 case IPV6_RTHDR:
909 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
910 err = -EINVAL;
911 goto exit_f;
912 }
913
914 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
915
916 switch (rthdr->type) {
917 #if IS_ENABLED(CONFIG_IPV6_MIP6)
918 case IPV6_SRCRT_TYPE_2:
919 if (rthdr->hdrlen != 2 ||
920 rthdr->segments_left != 1) {
921 err = -EINVAL;
922 goto exit_f;
923 }
924 break;
925 #endif
926 default:
927 err = -EINVAL;
928 goto exit_f;
929 }
930
931 len = ((rthdr->hdrlen + 1) << 3);
932
933 if (cmsg->cmsg_len < CMSG_LEN(len)) {
934 err = -EINVAL;
935 goto exit_f;
936 }
937
938 /* segments left must also match */
939 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
940 err = -EINVAL;
941 goto exit_f;
942 }
943
944 opt->opt_nflen += len;
945 opt->srcrt = rthdr;
946
947 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
948 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
949
950 opt->opt_nflen += dsthdrlen;
951 opt->dst0opt = opt->dst1opt;
952 opt->dst1opt = NULL;
953 opt->opt_flen -= dsthdrlen;
954 }
955
956 break;
957
958 case IPV6_2292HOPLIMIT:
959 case IPV6_HOPLIMIT:
960 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
961 err = -EINVAL;
962 goto exit_f;
963 }
964
965 ipc6->hlimit = *(int *)CMSG_DATA(cmsg);
966 if (ipc6->hlimit < -1 || ipc6->hlimit > 0xff) {
967 err = -EINVAL;
968 goto exit_f;
969 }
970
971 break;
972
973 case IPV6_TCLASS:
974 {
975 int tc;
976
977 err = -EINVAL;
978 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
979 goto exit_f;
980
981 tc = *(int *)CMSG_DATA(cmsg);
982 if (tc < -1 || tc > 0xff)
983 goto exit_f;
984
985 err = 0;
986 ipc6->tclass = tc;
987
988 break;
989 }
990
991 case IPV6_DONTFRAG:
992 {
993 int df;
994
995 err = -EINVAL;
996 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
997 goto exit_f;
998
999 df = *(int *)CMSG_DATA(cmsg);
1000 if (df < 0 || df > 1)
1001 goto exit_f;
1002
1003 err = 0;
1004 ipc6->dontfrag = df;
1005
1006 break;
1007 }
1008 default:
1009 net_dbg_ratelimited("invalid cmsg type: %d\n",
1010 cmsg->cmsg_type);
1011 err = -EINVAL;
1012 goto exit_f;
1013 }
1014 }
1015
1016 exit_f:
1017 return err;
1018 }
1019 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
1020
1021 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
1022 __u16 srcp, __u16 destp, int bucket)
1023 {
1024 const struct in6_addr *dest, *src;
1025
1026 dest = &sp->sk_v6_daddr;
1027 src = &sp->sk_v6_rcv_saddr;
1028 seq_printf(seq,
1029 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1030 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
1031 bucket,
1032 src->s6_addr32[0], src->s6_addr32[1],
1033 src->s6_addr32[2], src->s6_addr32[3], srcp,
1034 dest->s6_addr32[0], dest->s6_addr32[1],
1035 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1036 sp->sk_state,
1037 sk_wmem_alloc_get(sp),
1038 sk_rmem_alloc_get(sp),
1039 0, 0L, 0,
1040 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1041 0,
1042 sock_i_ino(sp),
1043 refcount_read(&sp->sk_refcnt), sp,
1044 atomic_read(&sp->sk_drops));
1045 }
Linux with added FPC-III support