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Linux 4.3
[linux/fpc-iii.git] / net / ipv6 / datagram.c
blob9aadd57808a515dda6edbf4b784aae2179604628
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 opt = flowlabel ? flowlabel->opt : np->opt;
171 final_p = fl6_update_dst(&fl6, opt, &final);
172
173 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
174 err = 0;
175 if (IS_ERR(dst)) {
176 err = PTR_ERR(dst);
177 goto out;
178 }
179
180 /* source address lookup done in ip6_dst_lookup */
181
182 if (ipv6_addr_any(&np->saddr))
183 np->saddr = fl6.saddr;
184
185 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
186 sk->sk_v6_rcv_saddr = fl6.saddr;
187 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
188 if (sk->sk_prot->rehash)
189 sk->sk_prot->rehash(sk);
190 }
191
192 ip6_dst_store(sk, dst,
193 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
194 &sk->sk_v6_daddr : NULL,
195 #ifdef CONFIG_IPV6_SUBTREES
196 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
197 &np->saddr :
198 #endif
199 NULL);
200
201 sk->sk_state = TCP_ESTABLISHED;
202 sk_set_txhash(sk);
203 out:
204 fl6_sock_release(flowlabel);
205 return err;
206 }
207
208 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
209 {
210 int res;
211
212 lock_sock(sk);
213 res = __ip6_datagram_connect(sk, uaddr, addr_len);
214 release_sock(sk);
215 return res;
216 }
217 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
218
219 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
220 int addr_len)
221 {
222 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
223 if (sin6->sin6_family != AF_INET6)
224 return -EAFNOSUPPORT;
225 return ip6_datagram_connect(sk, uaddr, addr_len);
226 }
227 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
228
229 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
230 __be16 port, u32 info, u8 *payload)
231 {
232 struct ipv6_pinfo *np = inet6_sk(sk);
233 struct icmp6hdr *icmph = icmp6_hdr(skb);
234 struct sock_exterr_skb *serr;
235
236 if (!np->recverr)
237 return;
238
239 skb = skb_clone(skb, GFP_ATOMIC);
240 if (!skb)
241 return;
242
243 skb->protocol = htons(ETH_P_IPV6);
244
245 serr = SKB_EXT_ERR(skb);
246 serr->ee.ee_errno = err;
247 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
248 serr->ee.ee_type = icmph->icmp6_type;
249 serr->ee.ee_code = icmph->icmp6_code;
250 serr->ee.ee_pad = 0;
251 serr->ee.ee_info = info;
252 serr->ee.ee_data = 0;
253 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
254 skb_network_header(skb);
255 serr->port = port;
256
257 __skb_pull(skb, payload - skb->data);
258 skb_reset_transport_header(skb);
259
260 if (sock_queue_err_skb(sk, skb))
261 kfree_skb(skb);
262 }
263
264 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
265 {
266 struct ipv6_pinfo *np = inet6_sk(sk);
267 struct sock_exterr_skb *serr;
268 struct ipv6hdr *iph;
269 struct sk_buff *skb;
270
271 if (!np->recverr)
272 return;
273
274 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
275 if (!skb)
276 return;
277
278 skb->protocol = htons(ETH_P_IPV6);
279
280 skb_put(skb, sizeof(struct ipv6hdr));
281 skb_reset_network_header(skb);
282 iph = ipv6_hdr(skb);
283 iph->daddr = fl6->daddr;
284
285 serr = SKB_EXT_ERR(skb);
286 serr->ee.ee_errno = err;
287 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
288 serr->ee.ee_type = 0;
289 serr->ee.ee_code = 0;
290 serr->ee.ee_pad = 0;
291 serr->ee.ee_info = info;
292 serr->ee.ee_data = 0;
293 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
294 serr->port = fl6->fl6_dport;
295
296 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
297 skb_reset_transport_header(skb);
298
299 if (sock_queue_err_skb(sk, skb))
300 kfree_skb(skb);
301 }
302
303 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
304 {
305 struct ipv6_pinfo *np = inet6_sk(sk);
306 struct ipv6hdr *iph;
307 struct sk_buff *skb;
308 struct ip6_mtuinfo *mtu_info;
309
310 if (!np->rxopt.bits.rxpmtu)
311 return;
312
313 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
314 if (!skb)
315 return;
316
317 skb_put(skb, sizeof(struct ipv6hdr));
318 skb_reset_network_header(skb);
319 iph = ipv6_hdr(skb);
320 iph->daddr = fl6->daddr;
321
322 mtu_info = IP6CBMTU(skb);
323
324 mtu_info->ip6m_mtu = mtu;
325 mtu_info->ip6m_addr.sin6_family = AF_INET6;
326 mtu_info->ip6m_addr.sin6_port = 0;
327 mtu_info->ip6m_addr.sin6_flowinfo = 0;
328 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
329 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
330
331 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
332 skb_reset_transport_header(skb);
333
334 skb = xchg(&np->rxpmtu, skb);
335 kfree_skb(skb);
336 }
337
338 /* For some errors we have valid addr_offset even with zero payload and
339 * zero port. Also, addr_offset should be supported if port is set.
340 */
341 static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
342 {
343 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
344 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
345 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
346 }
347
348 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
349 *
350 * At one point, excluding local errors was a quick test to identify icmp/icmp6
351 * errors. This is no longer true, but the test remained, so the v6 stack,
352 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
353 *
354 * Timestamp code paths do not initialize the fields expected by cmsg:
355 * the PKTINFO fields in skb->cb[]. Fill those in here.
356 */
357 static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
358 struct sock_exterr_skb *serr)
359 {
360 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
361 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
362 return true;
363
364 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
365 return false;
366
367 if (!skb->dev)
368 return false;
369
370 if (skb->protocol == htons(ETH_P_IPV6))
371 IP6CB(skb)->iif = skb->dev->ifindex;
372 else
373 PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex;
374
375 return true;
376 }
377
378 /*
379 * Handle MSG_ERRQUEUE
380 */
381 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
382 {
383 struct ipv6_pinfo *np = inet6_sk(sk);
384 struct sock_exterr_skb *serr;
385 struct sk_buff *skb;
386 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
387 struct {
388 struct sock_extended_err ee;
389 struct sockaddr_in6 offender;
390 } errhdr;
391 int err;
392 int copied;
393
394 err = -EAGAIN;
395 skb = sock_dequeue_err_skb(sk);
396 if (!skb)
397 goto out;
398
399 copied = skb->len;
400 if (copied > len) {
401 msg->msg_flags |= MSG_TRUNC;
402 copied = len;
403 }
404 err = skb_copy_datagram_msg(skb, 0, msg, copied);
405 if (err)
406 goto out_free_skb;
407
408 sock_recv_timestamp(msg, sk, skb);
409
410 serr = SKB_EXT_ERR(skb);
411
412 if (sin && ipv6_datagram_support_addr(serr)) {
413 const unsigned char *nh = skb_network_header(skb);
414 sin->sin6_family = AF_INET6;
415 sin->sin6_flowinfo = 0;
416 sin->sin6_port = serr->port;
417 if (skb->protocol == htons(ETH_P_IPV6)) {
418 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
419 struct ipv6hdr, daddr);
420 sin->sin6_addr = ip6h->daddr;
421 if (np->sndflow)
422 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
423 sin->sin6_scope_id =
424 ipv6_iface_scope_id(&sin->sin6_addr,
425 IP6CB(skb)->iif);
426 } else {
427 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
428 &sin->sin6_addr);
429 sin->sin6_scope_id = 0;
430 }
431 *addr_len = sizeof(*sin);
432 }
433
434 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
435 sin = &errhdr.offender;
436 memset(sin, 0, sizeof(*sin));
437
438 if (ip6_datagram_support_cmsg(skb, serr)) {
439 sin->sin6_family = AF_INET6;
440 if (np->rxopt.all)
441 ip6_datagram_recv_common_ctl(sk, msg, skb);
442 if (skb->protocol == htons(ETH_P_IPV6)) {
443 sin->sin6_addr = ipv6_hdr(skb)->saddr;
444 if (np->rxopt.all)
445 ip6_datagram_recv_specific_ctl(sk, msg, skb);
446 sin->sin6_scope_id =
447 ipv6_iface_scope_id(&sin->sin6_addr,
448 IP6CB(skb)->iif);
449 } else {
450 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
451 &sin->sin6_addr);
452 if (inet_sk(sk)->cmsg_flags)
453 ip_cmsg_recv(msg, skb);
454 }
455 }
456
457 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
458
459 /* Now we could try to dump offended packet options */
460
461 msg->msg_flags |= MSG_ERRQUEUE;
462 err = copied;
463
464 out_free_skb:
465 kfree_skb(skb);
466 out:
467 return err;
468 }
469 EXPORT_SYMBOL_GPL(ipv6_recv_error);
470
471 /*
472 * Handle IPV6_RECVPATHMTU
473 */
474 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
475 int *addr_len)
476 {
477 struct ipv6_pinfo *np = inet6_sk(sk);
478 struct sk_buff *skb;
479 struct ip6_mtuinfo mtu_info;
480 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
481 int err;
482 int copied;
483
484 err = -EAGAIN;
485 skb = xchg(&np->rxpmtu, NULL);
486 if (!skb)
487 goto out;
488
489 copied = skb->len;
490 if (copied > len) {
491 msg->msg_flags |= MSG_TRUNC;
492 copied = len;
493 }
494 err = skb_copy_datagram_msg(skb, 0, msg, copied);
495 if (err)
496 goto out_free_skb;
497
498 sock_recv_timestamp(msg, sk, skb);
499
500 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
501
502 if (sin) {
503 sin->sin6_family = AF_INET6;
504 sin->sin6_flowinfo = 0;
505 sin->sin6_port = 0;
506 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
507 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
508 *addr_len = sizeof(*sin);
509 }
510
511 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
512
513 err = copied;
514
515 out_free_skb:
516 kfree_skb(skb);
517 out:
518 return err;
519 }
520
521
522 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
523 struct sk_buff *skb)
524 {
525 struct ipv6_pinfo *np = inet6_sk(sk);
526 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
527
528 if (np->rxopt.bits.rxinfo) {
529 struct in6_pktinfo src_info;
530
531 if (is_ipv6) {
532 src_info.ipi6_ifindex = IP6CB(skb)->iif;
533 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
534 } else {
535 src_info.ipi6_ifindex =
536 PKTINFO_SKB_CB(skb)->ipi_ifindex;
537 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
538 &src_info.ipi6_addr);
539 }
540
541 if (src_info.ipi6_ifindex >= 0)
542 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
543 sizeof(src_info), &src_info);
544 }
545 }
546
547 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
548 struct sk_buff *skb)
549 {
550 struct ipv6_pinfo *np = inet6_sk(sk);
551 struct inet6_skb_parm *opt = IP6CB(skb);
552 unsigned char *nh = skb_network_header(skb);
553
554 if (np->rxopt.bits.rxhlim) {
555 int hlim = ipv6_hdr(skb)->hop_limit;
556 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
557 }
558
559 if (np->rxopt.bits.rxtclass) {
560 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
561 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
562 }
563
564 if (np->rxopt.bits.rxflow) {
565 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
566 if (flowinfo)
567 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
568 }
569
570 /* HbH is allowed only once */
571 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
572 u8 *ptr = nh + sizeof(struct ipv6hdr);
573 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
574 }
575
576 if (opt->lastopt &&
577 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
578 /*
579 * Silly enough, but we need to reparse in order to
580 * report extension headers (except for HbH)
581 * in order.
582 *
583 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
584 * (and WILL NOT be) defined because
585 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
586 */
587 unsigned int off = sizeof(struct ipv6hdr);
588 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
589
590 while (off <= opt->lastopt) {
591 unsigned int len;
592 u8 *ptr = nh + off;
593
594 switch (nexthdr) {
595 case IPPROTO_DSTOPTS:
596 nexthdr = ptr[0];
597 len = (ptr[1] + 1) << 3;
598 if (np->rxopt.bits.dstopts)
599 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
600 break;
601 case IPPROTO_ROUTING:
602 nexthdr = ptr[0];
603 len = (ptr[1] + 1) << 3;
604 if (np->rxopt.bits.srcrt)
605 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
606 break;
607 case IPPROTO_AH:
608 nexthdr = ptr[0];
609 len = (ptr[1] + 2) << 2;
610 break;
611 default:
612 nexthdr = ptr[0];
613 len = (ptr[1] + 1) << 3;
614 break;
615 }
616
617 off += len;
618 }
619 }
620
621 /* socket options in old style */
622 if (np->rxopt.bits.rxoinfo) {
623 struct in6_pktinfo src_info;
624
625 src_info.ipi6_ifindex = opt->iif;
626 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
627 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
628 }
629 if (np->rxopt.bits.rxohlim) {
630 int hlim = ipv6_hdr(skb)->hop_limit;
631 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
632 }
633 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
634 u8 *ptr = nh + sizeof(struct ipv6hdr);
635 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
636 }
637 if (np->rxopt.bits.odstopts && opt->dst0) {
638 u8 *ptr = nh + opt->dst0;
639 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
640 }
641 if (np->rxopt.bits.osrcrt && opt->srcrt) {
642 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
643 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
644 }
645 if (np->rxopt.bits.odstopts && opt->dst1) {
646 u8 *ptr = nh + opt->dst1;
647 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
648 }
649 if (np->rxopt.bits.rxorigdstaddr) {
650 struct sockaddr_in6 sin6;
651 __be16 *ports = (__be16 *) skb_transport_header(skb);
652
653 if (skb_transport_offset(skb) + 4 <= skb->len) {
654 /* All current transport protocols have the port numbers in the
655 * first four bytes of the transport header and this function is
656 * written with this assumption in mind.
657 */
658
659 sin6.sin6_family = AF_INET6;
660 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
661 sin6.sin6_port = ports[1];
662 sin6.sin6_flowinfo = 0;
663 sin6.sin6_scope_id =
664 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
665 opt->iif);
666
667 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
668 }
669 }
670 }
671
672 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
673 struct sk_buff *skb)
674 {
675 ip6_datagram_recv_common_ctl(sk, msg, skb);
676 ip6_datagram_recv_specific_ctl(sk, msg, skb);
677 }
678 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
679
680 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
681 struct msghdr *msg, struct flowi6 *fl6,
682 struct ipv6_txoptions *opt,
683 int *hlimit, int *tclass, int *dontfrag)
684 {
685 struct in6_pktinfo *src_info;
686 struct cmsghdr *cmsg;
687 struct ipv6_rt_hdr *rthdr;
688 struct ipv6_opt_hdr *hdr;
689 int len;
690 int err = 0;
691
692 for_each_cmsghdr(cmsg, msg) {
693 int addr_type;
694
695 if (!CMSG_OK(msg, cmsg)) {
696 err = -EINVAL;
697 goto exit_f;
698 }
699
700 if (cmsg->cmsg_level != SOL_IPV6)
701 continue;
702
703 switch (cmsg->cmsg_type) {
704 case IPV6_PKTINFO:
705 case IPV6_2292PKTINFO:
706 {
707 struct net_device *dev = NULL;
708
709 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
710 err = -EINVAL;
711 goto exit_f;
712 }
713
714 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
715
716 if (src_info->ipi6_ifindex) {
717 if (fl6->flowi6_oif &&
718 src_info->ipi6_ifindex != fl6->flowi6_oif)
719 return -EINVAL;
720 fl6->flowi6_oif = src_info->ipi6_ifindex;
721 }
722
723 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
724
725 rcu_read_lock();
726 if (fl6->flowi6_oif) {
727 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
728 if (!dev) {
729 rcu_read_unlock();
730 return -ENODEV;
731 }
732 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
733 rcu_read_unlock();
734 return -EINVAL;
735 }
736
737 if (addr_type != IPV6_ADDR_ANY) {
738 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
739 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
740 !ipv6_chk_addr(net, &src_info->ipi6_addr,
741 strict ? dev : NULL, 0) &&
742 !ipv6_chk_acast_addr_src(net, dev,
743 &src_info->ipi6_addr))
744 err = -EINVAL;
745 else
746 fl6->saddr = src_info->ipi6_addr;
747 }
748
749 rcu_read_unlock();
750
751 if (err)
752 goto exit_f;
753
754 break;
755 }
756
757 case IPV6_FLOWINFO:
758 if (cmsg->cmsg_len < CMSG_LEN(4)) {
759 err = -EINVAL;
760 goto exit_f;
761 }
762
763 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
764 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
765 err = -EINVAL;
766 goto exit_f;
767 }
768 }
769 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
770 break;
771
772 case IPV6_2292HOPOPTS:
773 case IPV6_HOPOPTS:
774 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
775 err = -EINVAL;
776 goto exit_f;
777 }
778
779 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
780 len = ((hdr->hdrlen + 1) << 3);
781 if (cmsg->cmsg_len < CMSG_LEN(len)) {
782 err = -EINVAL;
783 goto exit_f;
784 }
785 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
786 err = -EPERM;
787 goto exit_f;
788 }
789 opt->opt_nflen += len;
790 opt->hopopt = hdr;
791 break;
792
793 case IPV6_2292DSTOPTS:
794 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
795 err = -EINVAL;
796 goto exit_f;
797 }
798
799 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
800 len = ((hdr->hdrlen + 1) << 3);
801 if (cmsg->cmsg_len < CMSG_LEN(len)) {
802 err = -EINVAL;
803 goto exit_f;
804 }
805 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
806 err = -EPERM;
807 goto exit_f;
808 }
809 if (opt->dst1opt) {
810 err = -EINVAL;
811 goto exit_f;
812 }
813 opt->opt_flen += len;
814 opt->dst1opt = hdr;
815 break;
816
817 case IPV6_DSTOPTS:
818 case IPV6_RTHDRDSTOPTS:
819 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
820 err = -EINVAL;
821 goto exit_f;
822 }
823
824 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
825 len = ((hdr->hdrlen + 1) << 3);
826 if (cmsg->cmsg_len < CMSG_LEN(len)) {
827 err = -EINVAL;
828 goto exit_f;
829 }
830 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
831 err = -EPERM;
832 goto exit_f;
833 }
834 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
835 opt->opt_flen += len;
836 opt->dst1opt = hdr;
837 } else {
838 opt->opt_nflen += len;
839 opt->dst0opt = hdr;
840 }
841 break;
842
843 case IPV6_2292RTHDR:
844 case IPV6_RTHDR:
845 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
846 err = -EINVAL;
847 goto exit_f;
848 }
849
850 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
851
852 switch (rthdr->type) {
853 #if IS_ENABLED(CONFIG_IPV6_MIP6)
854 case IPV6_SRCRT_TYPE_2:
855 if (rthdr->hdrlen != 2 ||
856 rthdr->segments_left != 1) {
857 err = -EINVAL;
858 goto exit_f;
859 }
860 break;
861 #endif
862 default:
863 err = -EINVAL;
864 goto exit_f;
865 }
866
867 len = ((rthdr->hdrlen + 1) << 3);
868
869 if (cmsg->cmsg_len < CMSG_LEN(len)) {
870 err = -EINVAL;
871 goto exit_f;
872 }
873
874 /* segments left must also match */
875 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
876 err = -EINVAL;
877 goto exit_f;
878 }
879
880 opt->opt_nflen += len;
881 opt->srcrt = rthdr;
882
883 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
884 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
885
886 opt->opt_nflen += dsthdrlen;
887 opt->dst0opt = opt->dst1opt;
888 opt->dst1opt = NULL;
889 opt->opt_flen -= dsthdrlen;
890 }
891
892 break;
893
894 case IPV6_2292HOPLIMIT:
895 case IPV6_HOPLIMIT:
896 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
897 err = -EINVAL;
898 goto exit_f;
899 }
900
901 *hlimit = *(int *)CMSG_DATA(cmsg);
902 if (*hlimit < -1 || *hlimit > 0xff) {
903 err = -EINVAL;
904 goto exit_f;
905 }
906
907 break;
908
909 case IPV6_TCLASS:
910 {
911 int tc;
912
913 err = -EINVAL;
914 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
915 goto exit_f;
916
917 tc = *(int *)CMSG_DATA(cmsg);
918 if (tc < -1 || tc > 0xff)
919 goto exit_f;
920
921 err = 0;
922 *tclass = tc;
923
924 break;
925 }
926
927 case IPV6_DONTFRAG:
928 {
929 int df;
930
931 err = -EINVAL;
932 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
933 goto exit_f;
934
935 df = *(int *)CMSG_DATA(cmsg);
936 if (df < 0 || df > 1)
937 goto exit_f;
938
939 err = 0;
940 *dontfrag = df;
941
942 break;
943 }
944 default:
945 net_dbg_ratelimited("invalid cmsg type: %d\n",
946 cmsg->cmsg_type);
947 err = -EINVAL;
948 goto exit_f;
949 }
950 }
951
952 exit_f:
953 return err;
954 }
955 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
956
957 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
958 __u16 srcp, __u16 destp, int bucket)
959 {
960 const struct in6_addr *dest, *src;
961
962 dest = &sp->sk_v6_daddr;
963 src = &sp->sk_v6_rcv_saddr;
964 seq_printf(seq,
965 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
966 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
967 bucket,
968 src->s6_addr32[0], src->s6_addr32[1],
969 src->s6_addr32[2], src->s6_addr32[3], srcp,
970 dest->s6_addr32[0], dest->s6_addr32[1],
971 dest->s6_addr32[2], dest->s6_addr32[3], destp,
972 sp->sk_state,
973 sk_wmem_alloc_get(sp),
974 sk_rmem_alloc_get(sp),
975 0, 0L, 0,
976 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
977 0,
978 sock_i_ino(sp),
979 atomic_read(&sp->sk_refcnt), sp,
980 atomic_read(&sp->sk_drops));
981 }
Linux with added FPC-III support