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drm/framebuffer: drm_framebuffer_read_refcount() constify argument
[linux/fpc-iii.git] / net / ipv6 / datagram.c
bloba1f9187130067dba6d485dbaade21d62080fcbf6
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->sk_bound_dev_if &&
225 sk->sk_bound_dev_if != usin->sin6_scope_id) {
226 err = -EINVAL;
227 goto out;
228 }
229 sk->sk_bound_dev_if = usin->sin6_scope_id;
230 }
231
232 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
233 sk->sk_bound_dev_if = np->mcast_oif;
234
235 /* Connect to link-local address requires an interface */
236 if (!sk->sk_bound_dev_if) {
237 err = -EINVAL;
238 goto out;
239 }
240 }
241
242 sk->sk_v6_daddr = *daddr;
243 np->flow_label = fl6_flowlabel;
244
245 inet->inet_dport = usin->sin6_port;
246
247 /*
248 * Check for a route to destination an obtain the
249 * destination cache for it.
250 */
251
252 err = ip6_datagram_dst_update(sk, true);
253 if (err) {
254 /* Reset daddr and dport so that udp_v6_early_demux()
255 * fails to find this socket
256 */
257 memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr));
258 inet->inet_dport = 0;
259 goto out;
260 }
261
262 sk->sk_state = TCP_ESTABLISHED;
263 sk_set_txhash(sk);
264 out:
265 return err;
266 }
267 EXPORT_SYMBOL_GPL(__ip6_datagram_connect);
268
269 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
270 {
271 int res;
272
273 lock_sock(sk);
274 res = __ip6_datagram_connect(sk, uaddr, addr_len);
275 release_sock(sk);
276 return res;
277 }
278 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
279
280 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
281 int addr_len)
282 {
283 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
284 if (sin6->sin6_family != AF_INET6)
285 return -EAFNOSUPPORT;
286 return ip6_datagram_connect(sk, uaddr, addr_len);
287 }
288 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
289
290 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
291 __be16 port, u32 info, u8 *payload)
292 {
293 struct ipv6_pinfo *np = inet6_sk(sk);
294 struct icmp6hdr *icmph = icmp6_hdr(skb);
295 struct sock_exterr_skb *serr;
296
297 if (!np->recverr)
298 return;
299
300 skb = skb_clone(skb, GFP_ATOMIC);
301 if (!skb)
302 return;
303
304 skb->protocol = htons(ETH_P_IPV6);
305
306 serr = SKB_EXT_ERR(skb);
307 serr->ee.ee_errno = err;
308 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
309 serr->ee.ee_type = icmph->icmp6_type;
310 serr->ee.ee_code = icmph->icmp6_code;
311 serr->ee.ee_pad = 0;
312 serr->ee.ee_info = info;
313 serr->ee.ee_data = 0;
314 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
315 skb_network_header(skb);
316 serr->port = port;
317
318 __skb_pull(skb, payload - skb->data);
319 skb_reset_transport_header(skb);
320
321 if (sock_queue_err_skb(sk, skb))
322 kfree_skb(skb);
323 }
324
325 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
326 {
327 const struct ipv6_pinfo *np = inet6_sk(sk);
328 struct sock_exterr_skb *serr;
329 struct ipv6hdr *iph;
330 struct sk_buff *skb;
331
332 if (!np->recverr)
333 return;
334
335 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
336 if (!skb)
337 return;
338
339 skb->protocol = htons(ETH_P_IPV6);
340
341 skb_put(skb, sizeof(struct ipv6hdr));
342 skb_reset_network_header(skb);
343 iph = ipv6_hdr(skb);
344 iph->daddr = fl6->daddr;
345
346 serr = SKB_EXT_ERR(skb);
347 serr->ee.ee_errno = err;
348 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
349 serr->ee.ee_type = 0;
350 serr->ee.ee_code = 0;
351 serr->ee.ee_pad = 0;
352 serr->ee.ee_info = info;
353 serr->ee.ee_data = 0;
354 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
355 serr->port = fl6->fl6_dport;
356
357 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
358 skb_reset_transport_header(skb);
359
360 if (sock_queue_err_skb(sk, skb))
361 kfree_skb(skb);
362 }
363
364 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
365 {
366 struct ipv6_pinfo *np = inet6_sk(sk);
367 struct ipv6hdr *iph;
368 struct sk_buff *skb;
369 struct ip6_mtuinfo *mtu_info;
370
371 if (!np->rxopt.bits.rxpmtu)
372 return;
373
374 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
375 if (!skb)
376 return;
377
378 skb_put(skb, sizeof(struct ipv6hdr));
379 skb_reset_network_header(skb);
380 iph = ipv6_hdr(skb);
381 iph->daddr = fl6->daddr;
382
383 mtu_info = IP6CBMTU(skb);
384
385 mtu_info->ip6m_mtu = mtu;
386 mtu_info->ip6m_addr.sin6_family = AF_INET6;
387 mtu_info->ip6m_addr.sin6_port = 0;
388 mtu_info->ip6m_addr.sin6_flowinfo = 0;
389 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
390 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
391
392 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
393 skb_reset_transport_header(skb);
394
395 skb = xchg(&np->rxpmtu, skb);
396 kfree_skb(skb);
397 }
398
399 /* For some errors we have valid addr_offset even with zero payload and
400 * zero port. Also, addr_offset should be supported if port is set.
401 */
402 static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
403 {
404 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
405 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
406 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
407 }
408
409 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
410 *
411 * At one point, excluding local errors was a quick test to identify icmp/icmp6
412 * errors. This is no longer true, but the test remained, so the v6 stack,
413 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
414 */
415 static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
416 struct sock_exterr_skb *serr)
417 {
418 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
419 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
420 return true;
421
422 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
423 return false;
424
425 if (!IP6CB(skb)->iif)
426 return false;
427
428 return true;
429 }
430
431 /*
432 * Handle MSG_ERRQUEUE
433 */
434 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
435 {
436 struct ipv6_pinfo *np = inet6_sk(sk);
437 struct sock_exterr_skb *serr;
438 struct sk_buff *skb;
439 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
440 struct {
441 struct sock_extended_err ee;
442 struct sockaddr_in6 offender;
443 } errhdr;
444 int err;
445 int copied;
446
447 err = -EAGAIN;
448 skb = sock_dequeue_err_skb(sk);
449 if (!skb)
450 goto out;
451
452 copied = skb->len;
453 if (copied > len) {
454 msg->msg_flags |= MSG_TRUNC;
455 copied = len;
456 }
457 err = skb_copy_datagram_msg(skb, 0, msg, copied);
458 if (unlikely(err)) {
459 kfree_skb(skb);
460 return err;
461 }
462 sock_recv_timestamp(msg, sk, skb);
463
464 serr = SKB_EXT_ERR(skb);
465
466 if (sin && ipv6_datagram_support_addr(serr)) {
467 const unsigned char *nh = skb_network_header(skb);
468 sin->sin6_family = AF_INET6;
469 sin->sin6_flowinfo = 0;
470 sin->sin6_port = serr->port;
471 if (skb->protocol == htons(ETH_P_IPV6)) {
472 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
473 struct ipv6hdr, daddr);
474 sin->sin6_addr = ip6h->daddr;
475 if (np->sndflow)
476 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
477 sin->sin6_scope_id =
478 ipv6_iface_scope_id(&sin->sin6_addr,
479 IP6CB(skb)->iif);
480 } else {
481 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
482 &sin->sin6_addr);
483 sin->sin6_scope_id = 0;
484 }
485 *addr_len = sizeof(*sin);
486 }
487
488 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
489 sin = &errhdr.offender;
490 memset(sin, 0, sizeof(*sin));
491
492 if (ip6_datagram_support_cmsg(skb, serr)) {
493 sin->sin6_family = AF_INET6;
494 if (np->rxopt.all)
495 ip6_datagram_recv_common_ctl(sk, msg, skb);
496 if (skb->protocol == htons(ETH_P_IPV6)) {
497 sin->sin6_addr = ipv6_hdr(skb)->saddr;
498 if (np->rxopt.all)
499 ip6_datagram_recv_specific_ctl(sk, msg, skb);
500 sin->sin6_scope_id =
501 ipv6_iface_scope_id(&sin->sin6_addr,
502 IP6CB(skb)->iif);
503 } else {
504 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
505 &sin->sin6_addr);
506 if (inet_sk(sk)->cmsg_flags)
507 ip_cmsg_recv(msg, skb);
508 }
509 }
510
511 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
512
513 /* Now we could try to dump offended packet options */
514
515 msg->msg_flags |= MSG_ERRQUEUE;
516 err = copied;
517
518 consume_skb(skb);
519 out:
520 return err;
521 }
522 EXPORT_SYMBOL_GPL(ipv6_recv_error);
523
524 /*
525 * Handle IPV6_RECVPATHMTU
526 */
527 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
528 int *addr_len)
529 {
530 struct ipv6_pinfo *np = inet6_sk(sk);
531 struct sk_buff *skb;
532 struct ip6_mtuinfo mtu_info;
533 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
534 int err;
535 int copied;
536
537 err = -EAGAIN;
538 skb = xchg(&np->rxpmtu, NULL);
539 if (!skb)
540 goto out;
541
542 copied = skb->len;
543 if (copied > len) {
544 msg->msg_flags |= MSG_TRUNC;
545 copied = len;
546 }
547 err = skb_copy_datagram_msg(skb, 0, msg, copied);
548 if (err)
549 goto out_free_skb;
550
551 sock_recv_timestamp(msg, sk, skb);
552
553 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
554
555 if (sin) {
556 sin->sin6_family = AF_INET6;
557 sin->sin6_flowinfo = 0;
558 sin->sin6_port = 0;
559 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
560 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
561 *addr_len = sizeof(*sin);
562 }
563
564 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
565
566 err = copied;
567
568 out_free_skb:
569 kfree_skb(skb);
570 out:
571 return err;
572 }
573
574
575 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
576 struct sk_buff *skb)
577 {
578 struct ipv6_pinfo *np = inet6_sk(sk);
579 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
580
581 if (np->rxopt.bits.rxinfo) {
582 struct in6_pktinfo src_info;
583
584 if (is_ipv6) {
585 src_info.ipi6_ifindex = IP6CB(skb)->iif;
586 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
587 } else {
588 src_info.ipi6_ifindex =
589 PKTINFO_SKB_CB(skb)->ipi_ifindex;
590 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
591 &src_info.ipi6_addr);
592 }
593
594 if (src_info.ipi6_ifindex >= 0)
595 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
596 sizeof(src_info), &src_info);
597 }
598 }
599
600 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
601 struct sk_buff *skb)
602 {
603 struct ipv6_pinfo *np = inet6_sk(sk);
604 struct inet6_skb_parm *opt = IP6CB(skb);
605 unsigned char *nh = skb_network_header(skb);
606
607 if (np->rxopt.bits.rxhlim) {
608 int hlim = ipv6_hdr(skb)->hop_limit;
609 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
610 }
611
612 if (np->rxopt.bits.rxtclass) {
613 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
614 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
615 }
616
617 if (np->rxopt.bits.rxflow) {
618 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
619 if (flowinfo)
620 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
621 }
622
623 /* HbH is allowed only once */
624 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
625 u8 *ptr = nh + sizeof(struct ipv6hdr);
626 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
627 }
628
629 if (opt->lastopt &&
630 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
631 /*
632 * Silly enough, but we need to reparse in order to
633 * report extension headers (except for HbH)
634 * in order.
635 *
636 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
637 * (and WILL NOT be) defined because
638 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
639 */
640 unsigned int off = sizeof(struct ipv6hdr);
641 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
642
643 while (off <= opt->lastopt) {
644 unsigned int len;
645 u8 *ptr = nh + off;
646
647 switch (nexthdr) {
648 case IPPROTO_DSTOPTS:
649 nexthdr = ptr[0];
650 len = (ptr[1] + 1) << 3;
651 if (np->rxopt.bits.dstopts)
652 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
653 break;
654 case IPPROTO_ROUTING:
655 nexthdr = ptr[0];
656 len = (ptr[1] + 1) << 3;
657 if (np->rxopt.bits.srcrt)
658 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
659 break;
660 case IPPROTO_AH:
661 nexthdr = ptr[0];
662 len = (ptr[1] + 2) << 2;
663 break;
664 default:
665 nexthdr = ptr[0];
666 len = (ptr[1] + 1) << 3;
667 break;
668 }
669
670 off += len;
671 }
672 }
673
674 /* socket options in old style */
675 if (np->rxopt.bits.rxoinfo) {
676 struct in6_pktinfo src_info;
677
678 src_info.ipi6_ifindex = opt->iif;
679 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
680 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
681 }
682 if (np->rxopt.bits.rxohlim) {
683 int hlim = ipv6_hdr(skb)->hop_limit;
684 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
685 }
686 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
687 u8 *ptr = nh + sizeof(struct ipv6hdr);
688 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
689 }
690 if (np->rxopt.bits.odstopts && opt->dst0) {
691 u8 *ptr = nh + opt->dst0;
692 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
693 }
694 if (np->rxopt.bits.osrcrt && opt->srcrt) {
695 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
696 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
697 }
698 if (np->rxopt.bits.odstopts && opt->dst1) {
699 u8 *ptr = nh + opt->dst1;
700 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
701 }
702 if (np->rxopt.bits.rxorigdstaddr) {
703 struct sockaddr_in6 sin6;
704 __be16 *ports = (__be16 *) skb_transport_header(skb);
705
706 if (skb_transport_offset(skb) + 4 <= (int)skb->len) {
707 /* All current transport protocols have the port numbers in the
708 * first four bytes of the transport header and this function is
709 * written with this assumption in mind.
710 */
711
712 sin6.sin6_family = AF_INET6;
713 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
714 sin6.sin6_port = ports[1];
715 sin6.sin6_flowinfo = 0;
716 sin6.sin6_scope_id =
717 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
718 opt->iif);
719
720 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
721 }
722 }
723 if (np->rxopt.bits.recvfragsize && opt->frag_max_size) {
724 int val = opt->frag_max_size;
725
726 put_cmsg(msg, SOL_IPV6, IPV6_RECVFRAGSIZE, sizeof(val), &val);
727 }
728 }
729
730 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
731 struct sk_buff *skb)
732 {
733 ip6_datagram_recv_common_ctl(sk, msg, skb);
734 ip6_datagram_recv_specific_ctl(sk, msg, skb);
735 }
736 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
737
738 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
739 struct msghdr *msg, struct flowi6 *fl6,
740 struct ipcm6_cookie *ipc6, struct sockcm_cookie *sockc)
741 {
742 struct in6_pktinfo *src_info;
743 struct cmsghdr *cmsg;
744 struct ipv6_rt_hdr *rthdr;
745 struct ipv6_opt_hdr *hdr;
746 struct ipv6_txoptions *opt = ipc6->opt;
747 int len;
748 int err = 0;
749
750 for_each_cmsghdr(cmsg, msg) {
751 int addr_type;
752
753 if (!CMSG_OK(msg, cmsg)) {
754 err = -EINVAL;
755 goto exit_f;
756 }
757
758 if (cmsg->cmsg_level == SOL_SOCKET) {
759 err = __sock_cmsg_send(sk, msg, cmsg, sockc);
760 if (err)
761 return err;
762 continue;
763 }
764
765 if (cmsg->cmsg_level != SOL_IPV6)
766 continue;
767
768 switch (cmsg->cmsg_type) {
769 case IPV6_PKTINFO:
770 case IPV6_2292PKTINFO:
771 {
772 struct net_device *dev = NULL;
773
774 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
775 err = -EINVAL;
776 goto exit_f;
777 }
778
779 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
780
781 if (src_info->ipi6_ifindex) {
782 if (fl6->flowi6_oif &&
783 src_info->ipi6_ifindex != fl6->flowi6_oif)
784 return -EINVAL;
785 fl6->flowi6_oif = src_info->ipi6_ifindex;
786 }
787
788 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
789
790 rcu_read_lock();
791 if (fl6->flowi6_oif) {
792 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
793 if (!dev) {
794 rcu_read_unlock();
795 return -ENODEV;
796 }
797 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
798 rcu_read_unlock();
799 return -EINVAL;
800 }
801
802 if (addr_type != IPV6_ADDR_ANY) {
803 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
804 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
805 !ipv6_chk_addr(net, &src_info->ipi6_addr,
806 strict ? dev : NULL, 0) &&
807 !ipv6_chk_acast_addr_src(net, dev,
808 &src_info->ipi6_addr))
809 err = -EINVAL;
810 else
811 fl6->saddr = src_info->ipi6_addr;
812 }
813
814 rcu_read_unlock();
815
816 if (err)
817 goto exit_f;
818
819 break;
820 }
821
822 case IPV6_FLOWINFO:
823 if (cmsg->cmsg_len < CMSG_LEN(4)) {
824 err = -EINVAL;
825 goto exit_f;
826 }
827
828 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
829 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
830 err = -EINVAL;
831 goto exit_f;
832 }
833 }
834 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
835 break;
836
837 case IPV6_2292HOPOPTS:
838 case IPV6_HOPOPTS:
839 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
840 err = -EINVAL;
841 goto exit_f;
842 }
843
844 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
845 len = ((hdr->hdrlen + 1) << 3);
846 if (cmsg->cmsg_len < CMSG_LEN(len)) {
847 err = -EINVAL;
848 goto exit_f;
849 }
850 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
851 err = -EPERM;
852 goto exit_f;
853 }
854 opt->opt_nflen += len;
855 opt->hopopt = hdr;
856 break;
857
858 case IPV6_2292DSTOPTS:
859 if (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 if (opt->dst1opt) {
875 err = -EINVAL;
876 goto exit_f;
877 }
878 opt->opt_flen += len;
879 opt->dst1opt = hdr;
880 break;
881
882 case IPV6_DSTOPTS:
883 case IPV6_RTHDRDSTOPTS:
884 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
885 err = -EINVAL;
886 goto exit_f;
887 }
888
889 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
890 len = ((hdr->hdrlen + 1) << 3);
891 if (cmsg->cmsg_len < CMSG_LEN(len)) {
892 err = -EINVAL;
893 goto exit_f;
894 }
895 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
896 err = -EPERM;
897 goto exit_f;
898 }
899 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
900 opt->opt_flen += len;
901 opt->dst1opt = hdr;
902 } else {
903 opt->opt_nflen += len;
904 opt->dst0opt = hdr;
905 }
906 break;
907
908 case IPV6_2292RTHDR:
909 case IPV6_RTHDR:
910 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
911 err = -EINVAL;
912 goto exit_f;
913 }
914
915 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
916
917 switch (rthdr->type) {
918 #if IS_ENABLED(CONFIG_IPV6_MIP6)
919 case IPV6_SRCRT_TYPE_2:
920 if (rthdr->hdrlen != 2 ||
921 rthdr->segments_left != 1) {
922 err = -EINVAL;
923 goto exit_f;
924 }
925 break;
926 #endif
927 default:
928 err = -EINVAL;
929 goto exit_f;
930 }
931
932 len = ((rthdr->hdrlen + 1) << 3);
933
934 if (cmsg->cmsg_len < CMSG_LEN(len)) {
935 err = -EINVAL;
936 goto exit_f;
937 }
938
939 /* segments left must also match */
940 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
941 err = -EINVAL;
942 goto exit_f;
943 }
944
945 opt->opt_nflen += len;
946 opt->srcrt = rthdr;
947
948 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
949 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
950
951 opt->opt_nflen += dsthdrlen;
952 opt->dst0opt = opt->dst1opt;
953 opt->dst1opt = NULL;
954 opt->opt_flen -= dsthdrlen;
955 }
956
957 break;
958
959 case IPV6_2292HOPLIMIT:
960 case IPV6_HOPLIMIT:
961 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
962 err = -EINVAL;
963 goto exit_f;
964 }
965
966 ipc6->hlimit = *(int *)CMSG_DATA(cmsg);
967 if (ipc6->hlimit < -1 || ipc6->hlimit > 0xff) {
968 err = -EINVAL;
969 goto exit_f;
970 }
971
972 break;
973
974 case IPV6_TCLASS:
975 {
976 int tc;
977
978 err = -EINVAL;
979 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
980 goto exit_f;
981
982 tc = *(int *)CMSG_DATA(cmsg);
983 if (tc < -1 || tc > 0xff)
984 goto exit_f;
985
986 err = 0;
987 ipc6->tclass = tc;
988
989 break;
990 }
991
992 case IPV6_DONTFRAG:
993 {
994 int df;
995
996 err = -EINVAL;
997 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
998 goto exit_f;
999
1000 df = *(int *)CMSG_DATA(cmsg);
1001 if (df < 0 || df > 1)
1002 goto exit_f;
1003
1004 err = 0;
1005 ipc6->dontfrag = df;
1006
1007 break;
1008 }
1009 default:
1010 net_dbg_ratelimited("invalid cmsg type: %d\n",
1011 cmsg->cmsg_type);
1012 err = -EINVAL;
1013 goto exit_f;
1014 }
1015 }
1016
1017 exit_f:
1018 return err;
1019 }
1020 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
1021
1022 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
1023 __u16 srcp, __u16 destp, int bucket)
1024 {
1025 const struct in6_addr *dest, *src;
1026
1027 dest = &sp->sk_v6_daddr;
1028 src = &sp->sk_v6_rcv_saddr;
1029 seq_printf(seq,
1030 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1031 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
1032 bucket,
1033 src->s6_addr32[0], src->s6_addr32[1],
1034 src->s6_addr32[2], src->s6_addr32[3], srcp,
1035 dest->s6_addr32[0], dest->s6_addr32[1],
1036 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1037 sp->sk_state,
1038 sk_wmem_alloc_get(sp),
1039 sk_rmem_alloc_get(sp),
1040 0, 0L, 0,
1041 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1042 0,
1043 sock_i_ino(sp),
1044 refcount_read(&sp->sk_refcnt), sp,
1045 atomic_read(&sp->sk_drops));
1046 }
Linux with added FPC-III support