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2f5e2f154d2133a007baf154054522a2a66c17ad
[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 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 == NULL)
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 out:
203 fl6_sock_release(flowlabel);
204 return err;
205 }
206 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
207
208 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
209 int addr_len)
210 {
211 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
212 if (sin6->sin6_family != AF_INET6)
213 return -EAFNOSUPPORT;
214 return ip6_datagram_connect(sk, uaddr, addr_len);
215 }
216 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
217
218 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
219 __be16 port, u32 info, u8 *payload)
220 {
221 struct ipv6_pinfo *np = inet6_sk(sk);
222 struct icmp6hdr *icmph = icmp6_hdr(skb);
223 struct sock_exterr_skb *serr;
224
225 if (!np->recverr)
226 return;
227
228 skb = skb_clone(skb, GFP_ATOMIC);
229 if (!skb)
230 return;
231
232 skb->protocol = htons(ETH_P_IPV6);
233
234 serr = SKB_EXT_ERR(skb);
235 serr->ee.ee_errno = err;
236 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
237 serr->ee.ee_type = icmph->icmp6_type;
238 serr->ee.ee_code = icmph->icmp6_code;
239 serr->ee.ee_pad = 0;
240 serr->ee.ee_info = info;
241 serr->ee.ee_data = 0;
242 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
243 skb_network_header(skb);
244 serr->port = port;
245
246 __skb_pull(skb, payload - skb->data);
247 skb_reset_transport_header(skb);
248
249 if (sock_queue_err_skb(sk, skb))
250 kfree_skb(skb);
251 }
252
253 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
254 {
255 struct ipv6_pinfo *np = inet6_sk(sk);
256 struct sock_exterr_skb *serr;
257 struct ipv6hdr *iph;
258 struct sk_buff *skb;
259
260 if (!np->recverr)
261 return;
262
263 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
264 if (!skb)
265 return;
266
267 skb->protocol = htons(ETH_P_IPV6);
268
269 skb_put(skb, sizeof(struct ipv6hdr));
270 skb_reset_network_header(skb);
271 iph = ipv6_hdr(skb);
272 iph->daddr = fl6->daddr;
273
274 serr = SKB_EXT_ERR(skb);
275 serr->ee.ee_errno = err;
276 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
277 serr->ee.ee_type = 0;
278 serr->ee.ee_code = 0;
279 serr->ee.ee_pad = 0;
280 serr->ee.ee_info = info;
281 serr->ee.ee_data = 0;
282 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
283 serr->port = fl6->fl6_dport;
284
285 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
286 skb_reset_transport_header(skb);
287
288 if (sock_queue_err_skb(sk, skb))
289 kfree_skb(skb);
290 }
291
292 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
293 {
294 struct ipv6_pinfo *np = inet6_sk(sk);
295 struct ipv6hdr *iph;
296 struct sk_buff *skb;
297 struct ip6_mtuinfo *mtu_info;
298
299 if (!np->rxopt.bits.rxpmtu)
300 return;
301
302 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
303 if (!skb)
304 return;
305
306 skb_put(skb, sizeof(struct ipv6hdr));
307 skb_reset_network_header(skb);
308 iph = ipv6_hdr(skb);
309 iph->daddr = fl6->daddr;
310
311 mtu_info = IP6CBMTU(skb);
312
313 mtu_info->ip6m_mtu = mtu;
314 mtu_info->ip6m_addr.sin6_family = AF_INET6;
315 mtu_info->ip6m_addr.sin6_port = 0;
316 mtu_info->ip6m_addr.sin6_flowinfo = 0;
317 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
318 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
319
320 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
321 skb_reset_transport_header(skb);
322
323 skb = xchg(&np->rxpmtu, skb);
324 kfree_skb(skb);
325 }
326
327 /*
328 * Handle MSG_ERRQUEUE
329 */
330 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
331 {
332 struct ipv6_pinfo *np = inet6_sk(sk);
333 struct sock_exterr_skb *serr;
334 struct sk_buff *skb, *skb2;
335 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
336 struct {
337 struct sock_extended_err ee;
338 struct sockaddr_in6 offender;
339 } errhdr;
340 int err;
341 int copied;
342
343 err = -EAGAIN;
344 skb = skb_dequeue(&sk->sk_error_queue);
345 if (skb == NULL)
346 goto out;
347
348 copied = skb->len;
349 if (copied > len) {
350 msg->msg_flags |= MSG_TRUNC;
351 copied = len;
352 }
353 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
354 if (err)
355 goto out_free_skb;
356
357 sock_recv_timestamp(msg, sk, skb);
358
359 serr = SKB_EXT_ERR(skb);
360
361 if (sin) {
362 const unsigned char *nh = skb_network_header(skb);
363 sin->sin6_family = AF_INET6;
364 sin->sin6_flowinfo = 0;
365 sin->sin6_port = serr->port;
366 if (skb->protocol == htons(ETH_P_IPV6)) {
367 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
368 struct ipv6hdr, daddr);
369 sin->sin6_addr = ip6h->daddr;
370 if (np->sndflow)
371 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
372 sin->sin6_scope_id =
373 ipv6_iface_scope_id(&sin->sin6_addr,
374 IP6CB(skb)->iif);
375 } else {
376 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
377 &sin->sin6_addr);
378 sin->sin6_scope_id = 0;
379 }
380 *addr_len = sizeof(*sin);
381 }
382
383 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
384 sin = &errhdr.offender;
385 sin->sin6_family = AF_UNSPEC;
386 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
387 sin->sin6_family = AF_INET6;
388 sin->sin6_flowinfo = 0;
389 sin->sin6_port = 0;
390 if (np->rxopt.all)
391 ip6_datagram_recv_common_ctl(sk, msg, skb);
392 if (skb->protocol == htons(ETH_P_IPV6)) {
393 sin->sin6_addr = ipv6_hdr(skb)->saddr;
394 if (np->rxopt.all)
395 ip6_datagram_recv_specific_ctl(sk, msg, skb);
396 sin->sin6_scope_id =
397 ipv6_iface_scope_id(&sin->sin6_addr,
398 IP6CB(skb)->iif);
399 } else {
400 struct inet_sock *inet = inet_sk(sk);
401
402 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
403 &sin->sin6_addr);
404 sin->sin6_scope_id = 0;
405 if (inet->cmsg_flags)
406 ip_cmsg_recv(msg, skb);
407 }
408 }
409
410 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
411
412 /* Now we could try to dump offended packet options */
413
414 msg->msg_flags |= MSG_ERRQUEUE;
415 err = copied;
416
417 /* Reset and regenerate socket error */
418 spin_lock_bh(&sk->sk_error_queue.lock);
419 sk->sk_err = 0;
420 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
421 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
422 spin_unlock_bh(&sk->sk_error_queue.lock);
423 sk->sk_error_report(sk);
424 } else {
425 spin_unlock_bh(&sk->sk_error_queue.lock);
426 }
427
428 out_free_skb:
429 kfree_skb(skb);
430 out:
431 return err;
432 }
433 EXPORT_SYMBOL_GPL(ipv6_recv_error);
434
435 /*
436 * Handle IPV6_RECVPATHMTU
437 */
438 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
439 int *addr_len)
440 {
441 struct ipv6_pinfo *np = inet6_sk(sk);
442 struct sk_buff *skb;
443 struct ip6_mtuinfo mtu_info;
444 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
445 int err;
446 int copied;
447
448 err = -EAGAIN;
449 skb = xchg(&np->rxpmtu, NULL);
450 if (skb == NULL)
451 goto out;
452
453 copied = skb->len;
454 if (copied > len) {
455 msg->msg_flags |= MSG_TRUNC;
456 copied = len;
457 }
458 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
459 if (err)
460 goto out_free_skb;
461
462 sock_recv_timestamp(msg, sk, skb);
463
464 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
465
466 if (sin) {
467 sin->sin6_family = AF_INET6;
468 sin->sin6_flowinfo = 0;
469 sin->sin6_port = 0;
470 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
471 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
472 *addr_len = sizeof(*sin);
473 }
474
475 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
476
477 err = copied;
478
479 out_free_skb:
480 kfree_skb(skb);
481 out:
482 return err;
483 }
484
485
486 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
487 struct sk_buff *skb)
488 {
489 struct ipv6_pinfo *np = inet6_sk(sk);
490 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
491
492 if (np->rxopt.bits.rxinfo) {
493 struct in6_pktinfo src_info;
494
495 if (is_ipv6) {
496 src_info.ipi6_ifindex = IP6CB(skb)->iif;
497 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
498 } else {
499 src_info.ipi6_ifindex =
500 PKTINFO_SKB_CB(skb)->ipi_ifindex;
501 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
502 &src_info.ipi6_addr);
503 }
504 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
505 }
506 }
507
508 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
509 struct sk_buff *skb)
510 {
511 struct ipv6_pinfo *np = inet6_sk(sk);
512 struct inet6_skb_parm *opt = IP6CB(skb);
513 unsigned char *nh = skb_network_header(skb);
514
515 if (np->rxopt.bits.rxhlim) {
516 int hlim = ipv6_hdr(skb)->hop_limit;
517 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
518 }
519
520 if (np->rxopt.bits.rxtclass) {
521 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
522 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
523 }
524
525 if (np->rxopt.bits.rxflow) {
526 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
527 if (flowinfo)
528 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
529 }
530
531 /* HbH is allowed only once */
532 if (np->rxopt.bits.hopopts && opt->hop) {
533 u8 *ptr = nh + opt->hop;
534 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
535 }
536
537 if (opt->lastopt &&
538 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
539 /*
540 * Silly enough, but we need to reparse in order to
541 * report extension headers (except for HbH)
542 * in order.
543 *
544 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
545 * (and WILL NOT be) defined because
546 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
547 */
548 unsigned int off = sizeof(struct ipv6hdr);
549 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
550
551 while (off <= opt->lastopt) {
552 unsigned int len;
553 u8 *ptr = nh + off;
554
555 switch (nexthdr) {
556 case IPPROTO_DSTOPTS:
557 nexthdr = ptr[0];
558 len = (ptr[1] + 1) << 3;
559 if (np->rxopt.bits.dstopts)
560 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
561 break;
562 case IPPROTO_ROUTING:
563 nexthdr = ptr[0];
564 len = (ptr[1] + 1) << 3;
565 if (np->rxopt.bits.srcrt)
566 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
567 break;
568 case IPPROTO_AH:
569 nexthdr = ptr[0];
570 len = (ptr[1] + 2) << 2;
571 break;
572 default:
573 nexthdr = ptr[0];
574 len = (ptr[1] + 1) << 3;
575 break;
576 }
577
578 off += len;
579 }
580 }
581
582 /* socket options in old style */
583 if (np->rxopt.bits.rxoinfo) {
584 struct in6_pktinfo src_info;
585
586 src_info.ipi6_ifindex = opt->iif;
587 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
588 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
589 }
590 if (np->rxopt.bits.rxohlim) {
591 int hlim = ipv6_hdr(skb)->hop_limit;
592 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
593 }
594 if (np->rxopt.bits.ohopopts && opt->hop) {
595 u8 *ptr = nh + opt->hop;
596 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
597 }
598 if (np->rxopt.bits.odstopts && opt->dst0) {
599 u8 *ptr = nh + opt->dst0;
600 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
601 }
602 if (np->rxopt.bits.osrcrt && opt->srcrt) {
603 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
604 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
605 }
606 if (np->rxopt.bits.odstopts && opt->dst1) {
607 u8 *ptr = nh + opt->dst1;
608 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
609 }
610 if (np->rxopt.bits.rxorigdstaddr) {
611 struct sockaddr_in6 sin6;
612 __be16 *ports = (__be16 *) skb_transport_header(skb);
613
614 if (skb_transport_offset(skb) + 4 <= skb->len) {
615 /* All current transport protocols have the port numbers in the
616 * first four bytes of the transport header and this function is
617 * written with this assumption in mind.
618 */
619
620 sin6.sin6_family = AF_INET6;
621 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
622 sin6.sin6_port = ports[1];
623 sin6.sin6_flowinfo = 0;
624 sin6.sin6_scope_id =
625 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
626 opt->iif);
627
628 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
629 }
630 }
631 }
632
633 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
634 struct sk_buff *skb)
635 {
636 ip6_datagram_recv_common_ctl(sk, msg, skb);
637 ip6_datagram_recv_specific_ctl(sk, msg, skb);
638 }
639 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
640
641 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
642 struct msghdr *msg, struct flowi6 *fl6,
643 struct ipv6_txoptions *opt,
644 int *hlimit, int *tclass, int *dontfrag)
645 {
646 struct in6_pktinfo *src_info;
647 struct cmsghdr *cmsg;
648 struct ipv6_rt_hdr *rthdr;
649 struct ipv6_opt_hdr *hdr;
650 int len;
651 int err = 0;
652
653 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
654 int addr_type;
655
656 if (!CMSG_OK(msg, cmsg)) {
657 err = -EINVAL;
658 goto exit_f;
659 }
660
661 if (cmsg->cmsg_level != SOL_IPV6)
662 continue;
663
664 switch (cmsg->cmsg_type) {
665 case IPV6_PKTINFO:
666 case IPV6_2292PKTINFO:
667 {
668 struct net_device *dev = NULL;
669
670 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
671 err = -EINVAL;
672 goto exit_f;
673 }
674
675 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
676
677 if (src_info->ipi6_ifindex) {
678 if (fl6->flowi6_oif &&
679 src_info->ipi6_ifindex != fl6->flowi6_oif)
680 return -EINVAL;
681 fl6->flowi6_oif = src_info->ipi6_ifindex;
682 }
683
684 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
685
686 rcu_read_lock();
687 if (fl6->flowi6_oif) {
688 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
689 if (!dev) {
690 rcu_read_unlock();
691 return -ENODEV;
692 }
693 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
694 rcu_read_unlock();
695 return -EINVAL;
696 }
697
698 if (addr_type != IPV6_ADDR_ANY) {
699 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
700 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
701 !ipv6_chk_addr(net, &src_info->ipi6_addr,
702 strict ? dev : NULL, 0))
703 err = -EINVAL;
704 else
705 fl6->saddr = src_info->ipi6_addr;
706 }
707
708 rcu_read_unlock();
709
710 if (err)
711 goto exit_f;
712
713 break;
714 }
715
716 case IPV6_FLOWINFO:
717 if (cmsg->cmsg_len < CMSG_LEN(4)) {
718 err = -EINVAL;
719 goto exit_f;
720 }
721
722 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
723 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
724 err = -EINVAL;
725 goto exit_f;
726 }
727 }
728 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
729 break;
730
731 case IPV6_2292HOPOPTS:
732 case IPV6_HOPOPTS:
733 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
734 err = -EINVAL;
735 goto exit_f;
736 }
737
738 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
739 len = ((hdr->hdrlen + 1) << 3);
740 if (cmsg->cmsg_len < CMSG_LEN(len)) {
741 err = -EINVAL;
742 goto exit_f;
743 }
744 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
745 err = -EPERM;
746 goto exit_f;
747 }
748 opt->opt_nflen += len;
749 opt->hopopt = hdr;
750 break;
751
752 case IPV6_2292DSTOPTS:
753 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
754 err = -EINVAL;
755 goto exit_f;
756 }
757
758 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
759 len = ((hdr->hdrlen + 1) << 3);
760 if (cmsg->cmsg_len < CMSG_LEN(len)) {
761 err = -EINVAL;
762 goto exit_f;
763 }
764 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
765 err = -EPERM;
766 goto exit_f;
767 }
768 if (opt->dst1opt) {
769 err = -EINVAL;
770 goto exit_f;
771 }
772 opt->opt_flen += len;
773 opt->dst1opt = hdr;
774 break;
775
776 case IPV6_DSTOPTS:
777 case IPV6_RTHDRDSTOPTS:
778 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
779 err = -EINVAL;
780 goto exit_f;
781 }
782
783 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
784 len = ((hdr->hdrlen + 1) << 3);
785 if (cmsg->cmsg_len < CMSG_LEN(len)) {
786 err = -EINVAL;
787 goto exit_f;
788 }
789 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
790 err = -EPERM;
791 goto exit_f;
792 }
793 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
794 opt->opt_flen += len;
795 opt->dst1opt = hdr;
796 } else {
797 opt->opt_nflen += len;
798 opt->dst0opt = hdr;
799 }
800 break;
801
802 case IPV6_2292RTHDR:
803 case IPV6_RTHDR:
804 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
805 err = -EINVAL;
806 goto exit_f;
807 }
808
809 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
810
811 switch (rthdr->type) {
812 #if IS_ENABLED(CONFIG_IPV6_MIP6)
813 case IPV6_SRCRT_TYPE_2:
814 if (rthdr->hdrlen != 2 ||
815 rthdr->segments_left != 1) {
816 err = -EINVAL;
817 goto exit_f;
818 }
819 break;
820 #endif
821 default:
822 err = -EINVAL;
823 goto exit_f;
824 }
825
826 len = ((rthdr->hdrlen + 1) << 3);
827
828 if (cmsg->cmsg_len < CMSG_LEN(len)) {
829 err = -EINVAL;
830 goto exit_f;
831 }
832
833 /* segments left must also match */
834 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
835 err = -EINVAL;
836 goto exit_f;
837 }
838
839 opt->opt_nflen += len;
840 opt->srcrt = rthdr;
841
842 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
843 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
844
845 opt->opt_nflen += dsthdrlen;
846 opt->dst0opt = opt->dst1opt;
847 opt->dst1opt = NULL;
848 opt->opt_flen -= dsthdrlen;
849 }
850
851 break;
852
853 case IPV6_2292HOPLIMIT:
854 case IPV6_HOPLIMIT:
855 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
856 err = -EINVAL;
857 goto exit_f;
858 }
859
860 *hlimit = *(int *)CMSG_DATA(cmsg);
861 if (*hlimit < -1 || *hlimit > 0xff) {
862 err = -EINVAL;
863 goto exit_f;
864 }
865
866 break;
867
868 case IPV6_TCLASS:
869 {
870 int tc;
871
872 err = -EINVAL;
873 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
874 goto exit_f;
875
876 tc = *(int *)CMSG_DATA(cmsg);
877 if (tc < -1 || tc > 0xff)
878 goto exit_f;
879
880 err = 0;
881 *tclass = tc;
882
883 break;
884 }
885
886 case IPV6_DONTFRAG:
887 {
888 int df;
889
890 err = -EINVAL;
891 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
892 goto exit_f;
893
894 df = *(int *)CMSG_DATA(cmsg);
895 if (df < 0 || df > 1)
896 goto exit_f;
897
898 err = 0;
899 *dontfrag = df;
900
901 break;
902 }
903 default:
904 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
905 cmsg->cmsg_type);
906 err = -EINVAL;
907 goto exit_f;
908 }
909 }
910
911 exit_f:
912 return err;
913 }
914 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
915
916 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
917 __u16 srcp, __u16 destp, int bucket)
918 {
919 const struct in6_addr *dest, *src;
920
921 dest = &sp->sk_v6_daddr;
922 src = &sp->sk_v6_rcv_saddr;
923 seq_printf(seq,
924 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
925 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
926 bucket,
927 src->s6_addr32[0], src->s6_addr32[1],
928 src->s6_addr32[2], src->s6_addr32[3], srcp,
929 dest->s6_addr32[0], dest->s6_addr32[1],
930 dest->s6_addr32[2], dest->s6_addr32[3], destp,
931 sp->sk_state,
932 sk_wmem_alloc_get(sp),
933 sk_rmem_alloc_get(sp),
934 0, 0L, 0,
935 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
936 0,
937 sock_i_ino(sp),
938 atomic_read(&sp->sk_refcnt), sp,
939 atomic_read(&sp->sk_drops));
940 }
Linux kernel - Deliverables
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