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d690204a0275cd0d0f659e8efd15c3f3889c9184
[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 usin->sin6_addr = flowlabel->dst;
77 }
78 }
79
80 addr_type = ipv6_addr_type(&usin->sin6_addr);
81
82 if (addr_type == IPV6_ADDR_ANY) {
83 /*
84 * connect to self
85 */
86 usin->sin6_addr.s6_addr[15] = 0x01;
87 }
88
89 daddr = &usin->sin6_addr;
90
91 if (addr_type == IPV6_ADDR_MAPPED) {
92 struct sockaddr_in sin;
93
94 if (__ipv6_only_sock(sk)) {
95 err = -ENETUNREACH;
96 goto out;
97 }
98 sin.sin_family = AF_INET;
99 sin.sin_addr.s_addr = daddr->s6_addr32[3];
100 sin.sin_port = usin->sin6_port;
101
102 err = ip4_datagram_connect(sk,
103 (struct sockaddr *) &sin,
104 sizeof(sin));
105
106 ipv4_connected:
107 if (err)
108 goto out;
109
110 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
111
112 if (ipv6_addr_any(&np->saddr) ||
113 ipv6_mapped_addr_any(&np->saddr))
114 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
115
116 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
117 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
118 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
119 &sk->sk_v6_rcv_saddr);
120 if (sk->sk_prot->rehash)
121 sk->sk_prot->rehash(sk);
122 }
123
124 goto out;
125 }
126
127 if (__ipv6_addr_needs_scope_id(addr_type)) {
128 if (addr_len >= sizeof(struct sockaddr_in6) &&
129 usin->sin6_scope_id) {
130 if (sk->sk_bound_dev_if &&
131 sk->sk_bound_dev_if != usin->sin6_scope_id) {
132 err = -EINVAL;
133 goto out;
134 }
135 sk->sk_bound_dev_if = usin->sin6_scope_id;
136 }
137
138 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
139 sk->sk_bound_dev_if = np->mcast_oif;
140
141 /* Connect to link-local address requires an interface */
142 if (!sk->sk_bound_dev_if) {
143 err = -EINVAL;
144 goto out;
145 }
146 }
147
148 sk->sk_v6_daddr = *daddr;
149 np->flow_label = fl6.flowlabel;
150
151 inet->inet_dport = usin->sin6_port;
152
153 /*
154 * Check for a route to destination an obtain the
155 * destination cache for it.
156 */
157
158 fl6.flowi6_proto = sk->sk_protocol;
159 fl6.daddr = sk->sk_v6_daddr;
160 fl6.saddr = np->saddr;
161 fl6.flowi6_oif = sk->sk_bound_dev_if;
162 fl6.flowi6_mark = sk->sk_mark;
163 fl6.fl6_dport = inet->inet_dport;
164 fl6.fl6_sport = inet->inet_sport;
165
166 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
167 fl6.flowi6_oif = np->mcast_oif;
168
169 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
170
171 opt = flowlabel ? flowlabel->opt : np->opt;
172 final_p = fl6_update_dst(&fl6, opt, &final);
173
174 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
175 err = 0;
176 if (IS_ERR(dst)) {
177 err = PTR_ERR(dst);
178 goto out;
179 }
180
181 /* source address lookup done in ip6_dst_lookup */
182
183 if (ipv6_addr_any(&np->saddr))
184 np->saddr = fl6.saddr;
185
186 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
187 sk->sk_v6_rcv_saddr = fl6.saddr;
188 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
189 if (sk->sk_prot->rehash)
190 sk->sk_prot->rehash(sk);
191 }
192
193 ip6_dst_store(sk, dst,
194 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
195 &sk->sk_v6_daddr : NULL,
196 #ifdef CONFIG_IPV6_SUBTREES
197 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
198 &np->saddr :
199 #endif
200 NULL);
201
202 sk->sk_state = TCP_ESTABLISHED;
203 out:
204 fl6_sock_release(flowlabel);
205 return err;
206 }
207 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
208
209 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
210 __be16 port, u32 info, u8 *payload)
211 {
212 struct ipv6_pinfo *np = inet6_sk(sk);
213 struct icmp6hdr *icmph = icmp6_hdr(skb);
214 struct sock_exterr_skb *serr;
215
216 if (!np->recverr)
217 return;
218
219 skb = skb_clone(skb, GFP_ATOMIC);
220 if (!skb)
221 return;
222
223 skb->protocol = htons(ETH_P_IPV6);
224
225 serr = SKB_EXT_ERR(skb);
226 serr->ee.ee_errno = err;
227 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
228 serr->ee.ee_type = icmph->icmp6_type;
229 serr->ee.ee_code = icmph->icmp6_code;
230 serr->ee.ee_pad = 0;
231 serr->ee.ee_info = info;
232 serr->ee.ee_data = 0;
233 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
234 skb_network_header(skb);
235 serr->port = port;
236
237 __skb_pull(skb, payload - skb->data);
238 skb_reset_transport_header(skb);
239
240 if (sock_queue_err_skb(sk, skb))
241 kfree_skb(skb);
242 }
243
244 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
245 {
246 struct ipv6_pinfo *np = inet6_sk(sk);
247 struct sock_exterr_skb *serr;
248 struct ipv6hdr *iph;
249 struct sk_buff *skb;
250
251 if (!np->recverr)
252 return;
253
254 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
255 if (!skb)
256 return;
257
258 skb->protocol = htons(ETH_P_IPV6);
259
260 skb_put(skb, sizeof(struct ipv6hdr));
261 skb_reset_network_header(skb);
262 iph = ipv6_hdr(skb);
263 iph->daddr = fl6->daddr;
264
265 serr = SKB_EXT_ERR(skb);
266 serr->ee.ee_errno = err;
267 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
268 serr->ee.ee_type = 0;
269 serr->ee.ee_code = 0;
270 serr->ee.ee_pad = 0;
271 serr->ee.ee_info = info;
272 serr->ee.ee_data = 0;
273 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
274 serr->port = fl6->fl6_dport;
275
276 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
277 skb_reset_transport_header(skb);
278
279 if (sock_queue_err_skb(sk, skb))
280 kfree_skb(skb);
281 }
282
283 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
284 {
285 struct ipv6_pinfo *np = inet6_sk(sk);
286 struct ipv6hdr *iph;
287 struct sk_buff *skb;
288 struct ip6_mtuinfo *mtu_info;
289
290 if (!np->rxopt.bits.rxpmtu)
291 return;
292
293 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
294 if (!skb)
295 return;
296
297 skb_put(skb, sizeof(struct ipv6hdr));
298 skb_reset_network_header(skb);
299 iph = ipv6_hdr(skb);
300 iph->daddr = fl6->daddr;
301
302 mtu_info = IP6CBMTU(skb);
303
304 mtu_info->ip6m_mtu = mtu;
305 mtu_info->ip6m_addr.sin6_family = AF_INET6;
306 mtu_info->ip6m_addr.sin6_port = 0;
307 mtu_info->ip6m_addr.sin6_flowinfo = 0;
308 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
309 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
310
311 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
312 skb_reset_transport_header(skb);
313
314 skb = xchg(&np->rxpmtu, skb);
315 kfree_skb(skb);
316 }
317
318 /*
319 * Handle MSG_ERRQUEUE
320 */
321 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
322 {
323 struct ipv6_pinfo *np = inet6_sk(sk);
324 struct sock_exterr_skb *serr;
325 struct sk_buff *skb, *skb2;
326 struct sockaddr_in6 *sin;
327 struct {
328 struct sock_extended_err ee;
329 struct sockaddr_in6 offender;
330 } errhdr;
331 int err;
332 int copied;
333
334 err = -EAGAIN;
335 skb = skb_dequeue(&sk->sk_error_queue);
336 if (skb == NULL)
337 goto out;
338
339 copied = skb->len;
340 if (copied > len) {
341 msg->msg_flags |= MSG_TRUNC;
342 copied = len;
343 }
344 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
345 if (err)
346 goto out_free_skb;
347
348 sock_recv_timestamp(msg, sk, skb);
349
350 serr = SKB_EXT_ERR(skb);
351
352 sin = (struct sockaddr_in6 *)msg->msg_name;
353 if (sin) {
354 const unsigned char *nh = skb_network_header(skb);
355 sin->sin6_family = AF_INET6;
356 sin->sin6_flowinfo = 0;
357 sin->sin6_port = serr->port;
358 if (skb->protocol == htons(ETH_P_IPV6)) {
359 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
360 struct ipv6hdr, daddr);
361 sin->sin6_addr = ip6h->daddr;
362 if (np->sndflow)
363 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
364 sin->sin6_scope_id =
365 ipv6_iface_scope_id(&sin->sin6_addr,
366 IP6CB(skb)->iif);
367 } else {
368 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
369 &sin->sin6_addr);
370 sin->sin6_scope_id = 0;
371 }
372 *addr_len = sizeof(*sin);
373 }
374
375 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
376 sin = &errhdr.offender;
377 sin->sin6_family = AF_UNSPEC;
378 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
379 sin->sin6_family = AF_INET6;
380 sin->sin6_flowinfo = 0;
381 if (skb->protocol == htons(ETH_P_IPV6)) {
382 sin->sin6_addr = ipv6_hdr(skb)->saddr;
383 if (np->rxopt.all)
384 ip6_datagram_recv_ctl(sk, msg, skb);
385 sin->sin6_scope_id =
386 ipv6_iface_scope_id(&sin->sin6_addr,
387 IP6CB(skb)->iif);
388 } else {
389 struct inet_sock *inet = inet_sk(sk);
390
391 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
392 &sin->sin6_addr);
393 sin->sin6_scope_id = 0;
394 if (inet->cmsg_flags)
395 ip_cmsg_recv(msg, skb);
396 }
397 }
398
399 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
400
401 /* Now we could try to dump offended packet options */
402
403 msg->msg_flags |= MSG_ERRQUEUE;
404 err = copied;
405
406 /* Reset and regenerate socket error */
407 spin_lock_bh(&sk->sk_error_queue.lock);
408 sk->sk_err = 0;
409 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
410 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
411 spin_unlock_bh(&sk->sk_error_queue.lock);
412 sk->sk_error_report(sk);
413 } else {
414 spin_unlock_bh(&sk->sk_error_queue.lock);
415 }
416
417 out_free_skb:
418 kfree_skb(skb);
419 out:
420 return err;
421 }
422 EXPORT_SYMBOL_GPL(ipv6_recv_error);
423
424 /*
425 * Handle IPV6_RECVPATHMTU
426 */
427 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
428 int *addr_len)
429 {
430 struct ipv6_pinfo *np = inet6_sk(sk);
431 struct sk_buff *skb;
432 struct sockaddr_in6 *sin;
433 struct ip6_mtuinfo mtu_info;
434 int err;
435 int copied;
436
437 err = -EAGAIN;
438 skb = xchg(&np->rxpmtu, NULL);
439 if (skb == NULL)
440 goto out;
441
442 copied = skb->len;
443 if (copied > len) {
444 msg->msg_flags |= MSG_TRUNC;
445 copied = len;
446 }
447 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
448 if (err)
449 goto out_free_skb;
450
451 sock_recv_timestamp(msg, sk, skb);
452
453 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
454
455 sin = (struct sockaddr_in6 *)msg->msg_name;
456 if (sin) {
457 sin->sin6_family = AF_INET6;
458 sin->sin6_flowinfo = 0;
459 sin->sin6_port = 0;
460 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
461 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
462 *addr_len = sizeof(*sin);
463 }
464
465 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
466
467 err = copied;
468
469 out_free_skb:
470 kfree_skb(skb);
471 out:
472 return err;
473 }
474
475
476 int ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
477 struct sk_buff *skb)
478 {
479 struct ipv6_pinfo *np = inet6_sk(sk);
480 struct inet6_skb_parm *opt = IP6CB(skb);
481 unsigned char *nh = skb_network_header(skb);
482
483 if (np->rxopt.bits.rxinfo) {
484 struct in6_pktinfo src_info;
485
486 src_info.ipi6_ifindex = opt->iif;
487 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
488 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
489 }
490
491 if (np->rxopt.bits.rxhlim) {
492 int hlim = ipv6_hdr(skb)->hop_limit;
493 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
494 }
495
496 if (np->rxopt.bits.rxtclass) {
497 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
498 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
499 }
500
501 if (np->rxopt.bits.rxflow) {
502 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
503 if (flowinfo)
504 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
505 }
506
507 /* HbH is allowed only once */
508 if (np->rxopt.bits.hopopts && opt->hop) {
509 u8 *ptr = nh + opt->hop;
510 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
511 }
512
513 if (opt->lastopt &&
514 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
515 /*
516 * Silly enough, but we need to reparse in order to
517 * report extension headers (except for HbH)
518 * in order.
519 *
520 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
521 * (and WILL NOT be) defined because
522 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
523 */
524 unsigned int off = sizeof(struct ipv6hdr);
525 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
526
527 while (off <= opt->lastopt) {
528 unsigned int len;
529 u8 *ptr = nh + off;
530
531 switch (nexthdr) {
532 case IPPROTO_DSTOPTS:
533 nexthdr = ptr[0];
534 len = (ptr[1] + 1) << 3;
535 if (np->rxopt.bits.dstopts)
536 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
537 break;
538 case IPPROTO_ROUTING:
539 nexthdr = ptr[0];
540 len = (ptr[1] + 1) << 3;
541 if (np->rxopt.bits.srcrt)
542 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
543 break;
544 case IPPROTO_AH:
545 nexthdr = ptr[0];
546 len = (ptr[1] + 2) << 2;
547 break;
548 default:
549 nexthdr = ptr[0];
550 len = (ptr[1] + 1) << 3;
551 break;
552 }
553
554 off += len;
555 }
556 }
557
558 /* socket options in old style */
559 if (np->rxopt.bits.rxoinfo) {
560 struct in6_pktinfo src_info;
561
562 src_info.ipi6_ifindex = opt->iif;
563 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
564 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
565 }
566 if (np->rxopt.bits.rxohlim) {
567 int hlim = ipv6_hdr(skb)->hop_limit;
568 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
569 }
570 if (np->rxopt.bits.ohopopts && opt->hop) {
571 u8 *ptr = nh + opt->hop;
572 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
573 }
574 if (np->rxopt.bits.odstopts && opt->dst0) {
575 u8 *ptr = nh + opt->dst0;
576 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
577 }
578 if (np->rxopt.bits.osrcrt && opt->srcrt) {
579 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
580 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
581 }
582 if (np->rxopt.bits.odstopts && opt->dst1) {
583 u8 *ptr = nh + opt->dst1;
584 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
585 }
586 if (np->rxopt.bits.rxorigdstaddr) {
587 struct sockaddr_in6 sin6;
588 __be16 *ports = (__be16 *) skb_transport_header(skb);
589
590 if (skb_transport_offset(skb) + 4 <= skb->len) {
591 /* All current transport protocols have the port numbers in the
592 * first four bytes of the transport header and this function is
593 * written with this assumption in mind.
594 */
595
596 sin6.sin6_family = AF_INET6;
597 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
598 sin6.sin6_port = ports[1];
599 sin6.sin6_flowinfo = 0;
600 sin6.sin6_scope_id =
601 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
602 opt->iif);
603
604 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
605 }
606 }
607 return 0;
608 }
609 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
610
611 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
612 struct msghdr *msg, struct flowi6 *fl6,
613 struct ipv6_txoptions *opt,
614 int *hlimit, int *tclass, int *dontfrag)
615 {
616 struct in6_pktinfo *src_info;
617 struct cmsghdr *cmsg;
618 struct ipv6_rt_hdr *rthdr;
619 struct ipv6_opt_hdr *hdr;
620 int len;
621 int err = 0;
622
623 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
624 int addr_type;
625
626 if (!CMSG_OK(msg, cmsg)) {
627 err = -EINVAL;
628 goto exit_f;
629 }
630
631 if (cmsg->cmsg_level != SOL_IPV6)
632 continue;
633
634 switch (cmsg->cmsg_type) {
635 case IPV6_PKTINFO:
636 case IPV6_2292PKTINFO:
637 {
638 struct net_device *dev = NULL;
639
640 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
641 err = -EINVAL;
642 goto exit_f;
643 }
644
645 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
646
647 if (src_info->ipi6_ifindex) {
648 if (fl6->flowi6_oif &&
649 src_info->ipi6_ifindex != fl6->flowi6_oif)
650 return -EINVAL;
651 fl6->flowi6_oif = src_info->ipi6_ifindex;
652 }
653
654 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
655
656 rcu_read_lock();
657 if (fl6->flowi6_oif) {
658 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
659 if (!dev) {
660 rcu_read_unlock();
661 return -ENODEV;
662 }
663 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
664 rcu_read_unlock();
665 return -EINVAL;
666 }
667
668 if (addr_type != IPV6_ADDR_ANY) {
669 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
670 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
671 !ipv6_chk_addr(net, &src_info->ipi6_addr,
672 strict ? dev : NULL, 0))
673 err = -EINVAL;
674 else
675 fl6->saddr = src_info->ipi6_addr;
676 }
677
678 rcu_read_unlock();
679
680 if (err)
681 goto exit_f;
682
683 break;
684 }
685
686 case IPV6_FLOWINFO:
687 if (cmsg->cmsg_len < CMSG_LEN(4)) {
688 err = -EINVAL;
689 goto exit_f;
690 }
691
692 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
693 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
694 err = -EINVAL;
695 goto exit_f;
696 }
697 }
698 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
699 break;
700
701 case IPV6_2292HOPOPTS:
702 case IPV6_HOPOPTS:
703 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
704 err = -EINVAL;
705 goto exit_f;
706 }
707
708 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
709 len = ((hdr->hdrlen + 1) << 3);
710 if (cmsg->cmsg_len < CMSG_LEN(len)) {
711 err = -EINVAL;
712 goto exit_f;
713 }
714 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
715 err = -EPERM;
716 goto exit_f;
717 }
718 opt->opt_nflen += len;
719 opt->hopopt = hdr;
720 break;
721
722 case IPV6_2292DSTOPTS:
723 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
724 err = -EINVAL;
725 goto exit_f;
726 }
727
728 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
729 len = ((hdr->hdrlen + 1) << 3);
730 if (cmsg->cmsg_len < CMSG_LEN(len)) {
731 err = -EINVAL;
732 goto exit_f;
733 }
734 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
735 err = -EPERM;
736 goto exit_f;
737 }
738 if (opt->dst1opt) {
739 err = -EINVAL;
740 goto exit_f;
741 }
742 opt->opt_flen += len;
743 opt->dst1opt = hdr;
744 break;
745
746 case IPV6_DSTOPTS:
747 case IPV6_RTHDRDSTOPTS:
748 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
749 err = -EINVAL;
750 goto exit_f;
751 }
752
753 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
754 len = ((hdr->hdrlen + 1) << 3);
755 if (cmsg->cmsg_len < CMSG_LEN(len)) {
756 err = -EINVAL;
757 goto exit_f;
758 }
759 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
760 err = -EPERM;
761 goto exit_f;
762 }
763 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
764 opt->opt_flen += len;
765 opt->dst1opt = hdr;
766 } else {
767 opt->opt_nflen += len;
768 opt->dst0opt = hdr;
769 }
770 break;
771
772 case IPV6_2292RTHDR:
773 case IPV6_RTHDR:
774 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
775 err = -EINVAL;
776 goto exit_f;
777 }
778
779 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
780
781 switch (rthdr->type) {
782 #if IS_ENABLED(CONFIG_IPV6_MIP6)
783 case IPV6_SRCRT_TYPE_2:
784 if (rthdr->hdrlen != 2 ||
785 rthdr->segments_left != 1) {
786 err = -EINVAL;
787 goto exit_f;
788 }
789 break;
790 #endif
791 default:
792 err = -EINVAL;
793 goto exit_f;
794 }
795
796 len = ((rthdr->hdrlen + 1) << 3);
797
798 if (cmsg->cmsg_len < CMSG_LEN(len)) {
799 err = -EINVAL;
800 goto exit_f;
801 }
802
803 /* segments left must also match */
804 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
805 err = -EINVAL;
806 goto exit_f;
807 }
808
809 opt->opt_nflen += len;
810 opt->srcrt = rthdr;
811
812 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
813 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
814
815 opt->opt_nflen += dsthdrlen;
816 opt->dst0opt = opt->dst1opt;
817 opt->dst1opt = NULL;
818 opt->opt_flen -= dsthdrlen;
819 }
820
821 break;
822
823 case IPV6_2292HOPLIMIT:
824 case IPV6_HOPLIMIT:
825 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
826 err = -EINVAL;
827 goto exit_f;
828 }
829
830 *hlimit = *(int *)CMSG_DATA(cmsg);
831 if (*hlimit < -1 || *hlimit > 0xff) {
832 err = -EINVAL;
833 goto exit_f;
834 }
835
836 break;
837
838 case IPV6_TCLASS:
839 {
840 int tc;
841
842 err = -EINVAL;
843 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
844 goto exit_f;
845
846 tc = *(int *)CMSG_DATA(cmsg);
847 if (tc < -1 || tc > 0xff)
848 goto exit_f;
849
850 err = 0;
851 *tclass = tc;
852
853 break;
854 }
855
856 case IPV6_DONTFRAG:
857 {
858 int df;
859
860 err = -EINVAL;
861 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
862 goto exit_f;
863
864 df = *(int *)CMSG_DATA(cmsg);
865 if (df < 0 || df > 1)
866 goto exit_f;
867
868 err = 0;
869 *dontfrag = df;
870
871 break;
872 }
873 default:
874 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
875 cmsg->cmsg_type);
876 err = -EINVAL;
877 goto exit_f;
878 }
879 }
880
881 exit_f:
882 return err;
883 }
884 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
885
886 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
887 __u16 srcp, __u16 destp, int bucket)
888 {
889 const struct in6_addr *dest, *src;
890
891 dest = &sp->sk_v6_daddr;
892 src = &sp->sk_v6_rcv_saddr;
893 seq_printf(seq,
894 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
895 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
896 bucket,
897 src->s6_addr32[0], src->s6_addr32[1],
898 src->s6_addr32[2], src->s6_addr32[3], srcp,
899 dest->s6_addr32[0], dest->s6_addr32[1],
900 dest->s6_addr32[2], dest->s6_addr32[3], destp,
901 sp->sk_state,
902 sk_wmem_alloc_get(sp),
903 sk_rmem_alloc_get(sp),
904 0, 0L, 0,
905 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
906 0,
907 sock_i_ino(sp),
908 atomic_read(&sp->sk_refcnt), sp,
909 atomic_read(&sp->sk_drops));
910 }
Linux kernel - Deliverables
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