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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
[linux-2.6/next.git] / net / ipv6 / datagram.c
blob16560336eb72315c9abb6e3938b6c01af3f3aa1f
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
26 #include <net/ipv6.h>
27 #include <net/ndisc.h>
28 #include <net/addrconf.h>
29 #include <net/transp_v6.h>
30 #include <net/ip6_route.h>
31 #include <net/tcp_states.h>
32
33 #include <linux/errqueue.h>
34 #include <asm/uaccess.h>
35
36 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
37 {
38 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
39 struct inet_sock *inet = inet_sk(sk);
40 struct ipv6_pinfo *np = inet6_sk(sk);
41 struct in6_addr *daddr, *final_p, final;
42 struct dst_entry *dst;
43 struct flowi6 fl6;
44 struct ip6_flowlabel *flowlabel = NULL;
45 struct ipv6_txoptions *opt;
46 int addr_type;
47 int err;
48
49 if (usin->sin6_family == AF_INET) {
50 if (__ipv6_only_sock(sk))
51 return -EAFNOSUPPORT;
52 err = ip4_datagram_connect(sk, uaddr, addr_len);
53 goto ipv4_connected;
54 }
55
56 if (addr_len < SIN6_LEN_RFC2133)
57 return -EINVAL;
58
59 if (usin->sin6_family != AF_INET6)
60 return -EAFNOSUPPORT;
61
62 memset(&fl6, 0, sizeof(fl6));
63 if (np->sndflow) {
64 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
65 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
66 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
67 if (flowlabel == NULL)
68 return -EINVAL;
69 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
70 }
71 }
72
73 addr_type = ipv6_addr_type(&usin->sin6_addr);
74
75 if (addr_type == IPV6_ADDR_ANY) {
76 /*
77 * connect to self
78 */
79 usin->sin6_addr.s6_addr[15] = 0x01;
80 }
81
82 daddr = &usin->sin6_addr;
83
84 if (addr_type == IPV6_ADDR_MAPPED) {
85 struct sockaddr_in sin;
86
87 if (__ipv6_only_sock(sk)) {
88 err = -ENETUNREACH;
89 goto out;
90 }
91 sin.sin_family = AF_INET;
92 sin.sin_addr.s_addr = daddr->s6_addr32[3];
93 sin.sin_port = usin->sin6_port;
94
95 err = ip4_datagram_connect(sk,
96 (struct sockaddr*) &sin,
97 sizeof(sin));
98
99 ipv4_connected:
100 if (err)
101 goto out;
102
103 ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr);
104
105 if (ipv6_addr_any(&np->saddr))
106 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
107
108 if (ipv6_addr_any(&np->rcv_saddr)) {
109 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
110 &np->rcv_saddr);
111 if (sk->sk_prot->rehash)
112 sk->sk_prot->rehash(sk);
113 }
114
115 goto out;
116 }
117
118 if (addr_type&IPV6_ADDR_LINKLOCAL) {
119 if (addr_len >= sizeof(struct sockaddr_in6) &&
120 usin->sin6_scope_id) {
121 if (sk->sk_bound_dev_if &&
122 sk->sk_bound_dev_if != usin->sin6_scope_id) {
123 err = -EINVAL;
124 goto out;
125 }
126 sk->sk_bound_dev_if = usin->sin6_scope_id;
127 }
128
129 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
130 sk->sk_bound_dev_if = np->mcast_oif;
131
132 /* Connect to link-local address requires an interface */
133 if (!sk->sk_bound_dev_if) {
134 err = -EINVAL;
135 goto out;
136 }
137 }
138
139 ipv6_addr_copy(&np->daddr, daddr);
140 np->flow_label = fl6.flowlabel;
141
142 inet->inet_dport = usin->sin6_port;
143
144 /*
145 * Check for a route to destination an obtain the
146 * destination cache for it.
147 */
148
149 fl6.flowi6_proto = sk->sk_protocol;
150 ipv6_addr_copy(&fl6.daddr, &np->daddr);
151 ipv6_addr_copy(&fl6.saddr, &np->saddr);
152 fl6.flowi6_oif = sk->sk_bound_dev_if;
153 fl6.flowi6_mark = sk->sk_mark;
154 fl6.fl6_dport = inet->inet_dport;
155 fl6.fl6_sport = inet->inet_sport;
156
157 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
158 fl6.flowi6_oif = np->mcast_oif;
159
160 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
161
162 opt = flowlabel ? flowlabel->opt : np->opt;
163 final_p = fl6_update_dst(&fl6, opt, &final);
164
165 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
166 err = 0;
167 if (IS_ERR(dst)) {
168 err = PTR_ERR(dst);
169 goto out;
170 }
171
172 /* source address lookup done in ip6_dst_lookup */
173
174 if (ipv6_addr_any(&np->saddr))
175 ipv6_addr_copy(&np->saddr, &fl6.saddr);
176
177 if (ipv6_addr_any(&np->rcv_saddr)) {
178 ipv6_addr_copy(&np->rcv_saddr, &fl6.saddr);
179 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
180 if (sk->sk_prot->rehash)
181 sk->sk_prot->rehash(sk);
182 }
183
184 ip6_dst_store(sk, dst,
185 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
186 &np->daddr : NULL,
187 #ifdef CONFIG_IPV6_SUBTREES
188 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
189 &np->saddr :
190 #endif
191 NULL);
192
193 sk->sk_state = TCP_ESTABLISHED;
194 out:
195 fl6_sock_release(flowlabel);
196 return err;
197 }
198
199 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
200 __be16 port, u32 info, u8 *payload)
201 {
202 struct ipv6_pinfo *np = inet6_sk(sk);
203 struct icmp6hdr *icmph = icmp6_hdr(skb);
204 struct sock_exterr_skb *serr;
205
206 if (!np->recverr)
207 return;
208
209 skb = skb_clone(skb, GFP_ATOMIC);
210 if (!skb)
211 return;
212
213 skb->protocol = htons(ETH_P_IPV6);
214
215 serr = SKB_EXT_ERR(skb);
216 serr->ee.ee_errno = err;
217 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
218 serr->ee.ee_type = icmph->icmp6_type;
219 serr->ee.ee_code = icmph->icmp6_code;
220 serr->ee.ee_pad = 0;
221 serr->ee.ee_info = info;
222 serr->ee.ee_data = 0;
223 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
224 skb_network_header(skb);
225 serr->port = port;
226
227 __skb_pull(skb, payload - skb->data);
228 skb_reset_transport_header(skb);
229
230 if (sock_queue_err_skb(sk, skb))
231 kfree_skb(skb);
232 }
233
234 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
235 {
236 struct ipv6_pinfo *np = inet6_sk(sk);
237 struct sock_exterr_skb *serr;
238 struct ipv6hdr *iph;
239 struct sk_buff *skb;
240
241 if (!np->recverr)
242 return;
243
244 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
245 if (!skb)
246 return;
247
248 skb->protocol = htons(ETH_P_IPV6);
249
250 skb_put(skb, sizeof(struct ipv6hdr));
251 skb_reset_network_header(skb);
252 iph = ipv6_hdr(skb);
253 ipv6_addr_copy(&iph->daddr, &fl6->daddr);
254
255 serr = SKB_EXT_ERR(skb);
256 serr->ee.ee_errno = err;
257 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
258 serr->ee.ee_type = 0;
259 serr->ee.ee_code = 0;
260 serr->ee.ee_pad = 0;
261 serr->ee.ee_info = info;
262 serr->ee.ee_data = 0;
263 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
264 serr->port = fl6->fl6_dport;
265
266 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
267 skb_reset_transport_header(skb);
268
269 if (sock_queue_err_skb(sk, skb))
270 kfree_skb(skb);
271 }
272
273 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
274 {
275 struct ipv6_pinfo *np = inet6_sk(sk);
276 struct ipv6hdr *iph;
277 struct sk_buff *skb;
278 struct ip6_mtuinfo *mtu_info;
279
280 if (!np->rxopt.bits.rxpmtu)
281 return;
282
283 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
284 if (!skb)
285 return;
286
287 skb_put(skb, sizeof(struct ipv6hdr));
288 skb_reset_network_header(skb);
289 iph = ipv6_hdr(skb);
290 ipv6_addr_copy(&iph->daddr, &fl6->daddr);
291
292 mtu_info = IP6CBMTU(skb);
293 if (!mtu_info) {
294 kfree_skb(skb);
295 return;
296 }
297
298 mtu_info->ip6m_mtu = mtu;
299 mtu_info->ip6m_addr.sin6_family = AF_INET6;
300 mtu_info->ip6m_addr.sin6_port = 0;
301 mtu_info->ip6m_addr.sin6_flowinfo = 0;
302 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
303 ipv6_addr_copy(&mtu_info->ip6m_addr.sin6_addr, &ipv6_hdr(skb)->daddr);
304
305 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
306 skb_reset_transport_header(skb);
307
308 skb = xchg(&np->rxpmtu, skb);
309 kfree_skb(skb);
310 }
311
312 /*
313 * Handle MSG_ERRQUEUE
314 */
315 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
316 {
317 struct ipv6_pinfo *np = inet6_sk(sk);
318 struct sock_exterr_skb *serr;
319 struct sk_buff *skb, *skb2;
320 struct sockaddr_in6 *sin;
321 struct {
322 struct sock_extended_err ee;
323 struct sockaddr_in6 offender;
324 } errhdr;
325 int err;
326 int copied;
327
328 err = -EAGAIN;
329 skb = skb_dequeue(&sk->sk_error_queue);
330 if (skb == NULL)
331 goto out;
332
333 copied = skb->len;
334 if (copied > len) {
335 msg->msg_flags |= MSG_TRUNC;
336 copied = len;
337 }
338 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
339 if (err)
340 goto out_free_skb;
341
342 sock_recv_timestamp(msg, sk, skb);
343
344 serr = SKB_EXT_ERR(skb);
345
346 sin = (struct sockaddr_in6 *)msg->msg_name;
347 if (sin) {
348 const unsigned char *nh = skb_network_header(skb);
349 sin->sin6_family = AF_INET6;
350 sin->sin6_flowinfo = 0;
351 sin->sin6_port = serr->port;
352 sin->sin6_scope_id = 0;
353 if (skb->protocol == htons(ETH_P_IPV6)) {
354 ipv6_addr_copy(&sin->sin6_addr,
355 (struct in6_addr *)(nh + serr->addr_offset));
356 if (np->sndflow)
357 sin->sin6_flowinfo =
358 (*(__be32 *)(nh + serr->addr_offset - 24) &
359 IPV6_FLOWINFO_MASK);
360 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
361 sin->sin6_scope_id = IP6CB(skb)->iif;
362 } else {
363 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
364 &sin->sin6_addr);
365 }
366 }
367
368 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
369 sin = &errhdr.offender;
370 sin->sin6_family = AF_UNSPEC;
371 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
372 sin->sin6_family = AF_INET6;
373 sin->sin6_flowinfo = 0;
374 sin->sin6_scope_id = 0;
375 if (skb->protocol == htons(ETH_P_IPV6)) {
376 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
377 if (np->rxopt.all)
378 datagram_recv_ctl(sk, msg, skb);
379 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
380 sin->sin6_scope_id = IP6CB(skb)->iif;
381 } else {
382 struct inet_sock *inet = inet_sk(sk);
383
384 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
385 &sin->sin6_addr);
386 if (inet->cmsg_flags)
387 ip_cmsg_recv(msg, skb);
388 }
389 }
390
391 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
392
393 /* Now we could try to dump offended packet options */
394
395 msg->msg_flags |= MSG_ERRQUEUE;
396 err = copied;
397
398 /* Reset and regenerate socket error */
399 spin_lock_bh(&sk->sk_error_queue.lock);
400 sk->sk_err = 0;
401 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
402 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
403 spin_unlock_bh(&sk->sk_error_queue.lock);
404 sk->sk_error_report(sk);
405 } else {
406 spin_unlock_bh(&sk->sk_error_queue.lock);
407 }
408
409 out_free_skb:
410 kfree_skb(skb);
411 out:
412 return err;
413 }
414
415 /*
416 * Handle IPV6_RECVPATHMTU
417 */
418 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len)
419 {
420 struct ipv6_pinfo *np = inet6_sk(sk);
421 struct sk_buff *skb;
422 struct sockaddr_in6 *sin;
423 struct ip6_mtuinfo mtu_info;
424 int err;
425 int copied;
426
427 err = -EAGAIN;
428 skb = xchg(&np->rxpmtu, NULL);
429 if (skb == NULL)
430 goto out;
431
432 copied = skb->len;
433 if (copied > len) {
434 msg->msg_flags |= MSG_TRUNC;
435 copied = len;
436 }
437 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
438 if (err)
439 goto out_free_skb;
440
441 sock_recv_timestamp(msg, sk, skb);
442
443 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
444
445 sin = (struct sockaddr_in6 *)msg->msg_name;
446 if (sin) {
447 sin->sin6_family = AF_INET6;
448 sin->sin6_flowinfo = 0;
449 sin->sin6_port = 0;
450 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
451 ipv6_addr_copy(&sin->sin6_addr, &mtu_info.ip6m_addr.sin6_addr);
452 }
453
454 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
455
456 err = copied;
457
458 out_free_skb:
459 kfree_skb(skb);
460 out:
461 return err;
462 }
463
464
465 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
466 {
467 struct ipv6_pinfo *np = inet6_sk(sk);
468 struct inet6_skb_parm *opt = IP6CB(skb);
469 unsigned char *nh = skb_network_header(skb);
470
471 if (np->rxopt.bits.rxinfo) {
472 struct in6_pktinfo src_info;
473
474 src_info.ipi6_ifindex = opt->iif;
475 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
476 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
477 }
478
479 if (np->rxopt.bits.rxhlim) {
480 int hlim = ipv6_hdr(skb)->hop_limit;
481 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
482 }
483
484 if (np->rxopt.bits.rxtclass) {
485 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
486 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
487 }
488
489 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
490 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
491 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
492 }
493
494 /* HbH is allowed only once */
495 if (np->rxopt.bits.hopopts && opt->hop) {
496 u8 *ptr = nh + opt->hop;
497 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
498 }
499
500 if (opt->lastopt &&
501 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
502 /*
503 * Silly enough, but we need to reparse in order to
504 * report extension headers (except for HbH)
505 * in order.
506 *
507 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
508 * (and WILL NOT be) defined because
509 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
510 */
511 unsigned int off = sizeof(struct ipv6hdr);
512 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
513
514 while (off <= opt->lastopt) {
515 unsigned len;
516 u8 *ptr = nh + off;
517
518 switch(nexthdr) {
519 case IPPROTO_DSTOPTS:
520 nexthdr = ptr[0];
521 len = (ptr[1] + 1) << 3;
522 if (np->rxopt.bits.dstopts)
523 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
524 break;
525 case IPPROTO_ROUTING:
526 nexthdr = ptr[0];
527 len = (ptr[1] + 1) << 3;
528 if (np->rxopt.bits.srcrt)
529 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
530 break;
531 case IPPROTO_AH:
532 nexthdr = ptr[0];
533 len = (ptr[1] + 2) << 2;
534 break;
535 default:
536 nexthdr = ptr[0];
537 len = (ptr[1] + 1) << 3;
538 break;
539 }
540
541 off += len;
542 }
543 }
544
545 /* socket options in old style */
546 if (np->rxopt.bits.rxoinfo) {
547 struct in6_pktinfo src_info;
548
549 src_info.ipi6_ifindex = opt->iif;
550 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
551 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
552 }
553 if (np->rxopt.bits.rxohlim) {
554 int hlim = ipv6_hdr(skb)->hop_limit;
555 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
556 }
557 if (np->rxopt.bits.ohopopts && opt->hop) {
558 u8 *ptr = nh + opt->hop;
559 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
560 }
561 if (np->rxopt.bits.odstopts && opt->dst0) {
562 u8 *ptr = nh + opt->dst0;
563 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
564 }
565 if (np->rxopt.bits.osrcrt && opt->srcrt) {
566 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
567 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
568 }
569 if (np->rxopt.bits.odstopts && opt->dst1) {
570 u8 *ptr = nh + opt->dst1;
571 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
572 }
573 if (np->rxopt.bits.rxorigdstaddr) {
574 struct sockaddr_in6 sin6;
575 u16 *ports = (u16 *) skb_transport_header(skb);
576
577 if (skb_transport_offset(skb) + 4 <= skb->len) {
578 /* All current transport protocols have the port numbers in the
579 * first four bytes of the transport header and this function is
580 * written with this assumption in mind.
581 */
582
583 sin6.sin6_family = AF_INET6;
584 ipv6_addr_copy(&sin6.sin6_addr, &ipv6_hdr(skb)->daddr);
585 sin6.sin6_port = ports[1];
586 sin6.sin6_flowinfo = 0;
587 sin6.sin6_scope_id = 0;
588
589 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
590 }
591 }
592 return 0;
593 }
594
595 int datagram_send_ctl(struct net *net,
596 struct msghdr *msg, struct flowi6 *fl6,
597 struct ipv6_txoptions *opt,
598 int *hlimit, int *tclass, int *dontfrag)
599 {
600 struct in6_pktinfo *src_info;
601 struct cmsghdr *cmsg;
602 struct ipv6_rt_hdr *rthdr;
603 struct ipv6_opt_hdr *hdr;
604 int len;
605 int err = 0;
606
607 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
608 int addr_type;
609
610 if (!CMSG_OK(msg, cmsg)) {
611 err = -EINVAL;
612 goto exit_f;
613 }
614
615 if (cmsg->cmsg_level != SOL_IPV6)
616 continue;
617
618 switch (cmsg->cmsg_type) {
619 case IPV6_PKTINFO:
620 case IPV6_2292PKTINFO:
621 {
622 struct net_device *dev = NULL;
623
624 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
625 err = -EINVAL;
626 goto exit_f;
627 }
628
629 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
630
631 if (src_info->ipi6_ifindex) {
632 if (fl6->flowi6_oif &&
633 src_info->ipi6_ifindex != fl6->flowi6_oif)
634 return -EINVAL;
635 fl6->flowi6_oif = src_info->ipi6_ifindex;
636 }
637
638 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
639
640 rcu_read_lock();
641 if (fl6->flowi6_oif) {
642 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
643 if (!dev) {
644 rcu_read_unlock();
645 return -ENODEV;
646 }
647 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
648 rcu_read_unlock();
649 return -EINVAL;
650 }
651
652 if (addr_type != IPV6_ADDR_ANY) {
653 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
654 if (!ipv6_chk_addr(net, &src_info->ipi6_addr,
655 strict ? dev : NULL, 0))
656 err = -EINVAL;
657 else
658 ipv6_addr_copy(&fl6->saddr, &src_info->ipi6_addr);
659 }
660
661 rcu_read_unlock();
662
663 if (err)
664 goto exit_f;
665
666 break;
667 }
668
669 case IPV6_FLOWINFO:
670 if (cmsg->cmsg_len < CMSG_LEN(4)) {
671 err = -EINVAL;
672 goto exit_f;
673 }
674
675 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
676 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
677 err = -EINVAL;
678 goto exit_f;
679 }
680 }
681 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
682 break;
683
684 case IPV6_2292HOPOPTS:
685 case IPV6_HOPOPTS:
686 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
687 err = -EINVAL;
688 goto exit_f;
689 }
690
691 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
692 len = ((hdr->hdrlen + 1) << 3);
693 if (cmsg->cmsg_len < CMSG_LEN(len)) {
694 err = -EINVAL;
695 goto exit_f;
696 }
697 if (!capable(CAP_NET_RAW)) {
698 err = -EPERM;
699 goto exit_f;
700 }
701 opt->opt_nflen += len;
702 opt->hopopt = hdr;
703 break;
704
705 case IPV6_2292DSTOPTS:
706 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
707 err = -EINVAL;
708 goto exit_f;
709 }
710
711 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
712 len = ((hdr->hdrlen + 1) << 3);
713 if (cmsg->cmsg_len < CMSG_LEN(len)) {
714 err = -EINVAL;
715 goto exit_f;
716 }
717 if (!capable(CAP_NET_RAW)) {
718 err = -EPERM;
719 goto exit_f;
720 }
721 if (opt->dst1opt) {
722 err = -EINVAL;
723 goto exit_f;
724 }
725 opt->opt_flen += len;
726 opt->dst1opt = hdr;
727 break;
728
729 case IPV6_DSTOPTS:
730 case IPV6_RTHDRDSTOPTS:
731 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
732 err = -EINVAL;
733 goto exit_f;
734 }
735
736 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
737 len = ((hdr->hdrlen + 1) << 3);
738 if (cmsg->cmsg_len < CMSG_LEN(len)) {
739 err = -EINVAL;
740 goto exit_f;
741 }
742 if (!capable(CAP_NET_RAW)) {
743 err = -EPERM;
744 goto exit_f;
745 }
746 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
747 opt->opt_flen += len;
748 opt->dst1opt = hdr;
749 } else {
750 opt->opt_nflen += len;
751 opt->dst0opt = hdr;
752 }
753 break;
754
755 case IPV6_2292RTHDR:
756 case IPV6_RTHDR:
757 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
758 err = -EINVAL;
759 goto exit_f;
760 }
761
762 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
763
764 switch (rthdr->type) {
765 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
766 case IPV6_SRCRT_TYPE_2:
767 if (rthdr->hdrlen != 2 ||
768 rthdr->segments_left != 1) {
769 err = -EINVAL;
770 goto exit_f;
771 }
772 break;
773 #endif
774 default:
775 err = -EINVAL;
776 goto exit_f;
777 }
778
779 len = ((rthdr->hdrlen + 1) << 3);
780
781 if (cmsg->cmsg_len < CMSG_LEN(len)) {
782 err = -EINVAL;
783 goto exit_f;
784 }
785
786 /* segments left must also match */
787 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
788 err = -EINVAL;
789 goto exit_f;
790 }
791
792 opt->opt_nflen += len;
793 opt->srcrt = rthdr;
794
795 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
796 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
797
798 opt->opt_nflen += dsthdrlen;
799 opt->dst0opt = opt->dst1opt;
800 opt->dst1opt = NULL;
801 opt->opt_flen -= dsthdrlen;
802 }
803
804 break;
805
806 case IPV6_2292HOPLIMIT:
807 case IPV6_HOPLIMIT:
808 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
809 err = -EINVAL;
810 goto exit_f;
811 }
812
813 *hlimit = *(int *)CMSG_DATA(cmsg);
814 if (*hlimit < -1 || *hlimit > 0xff) {
815 err = -EINVAL;
816 goto exit_f;
817 }
818
819 break;
820
821 case IPV6_TCLASS:
822 {
823 int tc;
824
825 err = -EINVAL;
826 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
827 goto exit_f;
828 }
829
830 tc = *(int *)CMSG_DATA(cmsg);
831 if (tc < -1 || tc > 0xff)
832 goto exit_f;
833
834 err = 0;
835 *tclass = tc;
836
837 break;
838 }
839
840 case IPV6_DONTFRAG:
841 {
842 int df;
843
844 err = -EINVAL;
845 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
846 goto exit_f;
847 }
848
849 df = *(int *)CMSG_DATA(cmsg);
850 if (df < 0 || df > 1)
851 goto exit_f;
852
853 err = 0;
854 *dontfrag = df;
855
856 break;
857 }
858 default:
859 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
860 cmsg->cmsg_type);
861 err = -EINVAL;
862 goto exit_f;
863 }
864 }
865
866 exit_f:
867 return err;
868 }
linux-next