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aufs: tiny, lockdep sub-classing
[zen-stable.git] / net / ipv6 / datagram.c
blob251e7cd75e89787f5346037a278bfd7e5b8c8ced
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 static inline int ipv6_mapped_addr_any(const struct in6_addr *a)
37 {
38 return (ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0));
39 }
40
41 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
42 {
43 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
44 struct inet_sock *inet = inet_sk(sk);
45 struct ipv6_pinfo *np = inet6_sk(sk);
46 struct in6_addr *daddr, *final_p, final;
47 struct dst_entry *dst;
48 struct flowi6 fl6;
49 struct ip6_flowlabel *flowlabel = NULL;
50 struct ipv6_txoptions *opt;
51 int addr_type;
52 int err;
53
54 if (usin->sin6_family == AF_INET) {
55 if (__ipv6_only_sock(sk))
56 return -EAFNOSUPPORT;
57 err = ip4_datagram_connect(sk, uaddr, addr_len);
58 goto ipv4_connected;
59 }
60
61 if (addr_len < SIN6_LEN_RFC2133)
62 return -EINVAL;
63
64 if (usin->sin6_family != AF_INET6)
65 return -EAFNOSUPPORT;
66
67 memset(&fl6, 0, sizeof(fl6));
68 if (np->sndflow) {
69 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
70 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
71 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
72 if (flowlabel == NULL)
73 return -EINVAL;
74 usin->sin6_addr = flowlabel->dst;
75 }
76 }
77
78 addr_type = ipv6_addr_type(&usin->sin6_addr);
79
80 if (addr_type == IPV6_ADDR_ANY) {
81 /*
82 * connect to self
83 */
84 usin->sin6_addr.s6_addr[15] = 0x01;
85 }
86
87 daddr = &usin->sin6_addr;
88
89 if (addr_type == IPV6_ADDR_MAPPED) {
90 struct sockaddr_in sin;
91
92 if (__ipv6_only_sock(sk)) {
93 err = -ENETUNREACH;
94 goto out;
95 }
96 sin.sin_family = AF_INET;
97 sin.sin_addr.s_addr = daddr->s6_addr32[3];
98 sin.sin_port = usin->sin6_port;
99
100 err = ip4_datagram_connect(sk,
101 (struct sockaddr*) &sin,
102 sizeof(sin));
103
104 ipv4_connected:
105 if (err)
106 goto out;
107
108 ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr);
109
110 if (ipv6_addr_any(&np->saddr) ||
111 ipv6_mapped_addr_any(&np->saddr))
112 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
113
114 if (ipv6_addr_any(&np->rcv_saddr) ||
115 ipv6_mapped_addr_any(&np->rcv_saddr)) {
116 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
117 &np->rcv_saddr);
118 if (sk->sk_prot->rehash)
119 sk->sk_prot->rehash(sk);
120 }
121
122 goto out;
123 }
124
125 if (addr_type&IPV6_ADDR_LINKLOCAL) {
126 if (addr_len >= sizeof(struct sockaddr_in6) &&
127 usin->sin6_scope_id) {
128 if (sk->sk_bound_dev_if &&
129 sk->sk_bound_dev_if != usin->sin6_scope_id) {
130 err = -EINVAL;
131 goto out;
132 }
133 sk->sk_bound_dev_if = usin->sin6_scope_id;
134 }
135
136 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
137 sk->sk_bound_dev_if = np->mcast_oif;
138
139 /* Connect to link-local address requires an interface */
140 if (!sk->sk_bound_dev_if) {
141 err = -EINVAL;
142 goto out;
143 }
144 }
145
146 np->daddr = *daddr;
147 np->flow_label = fl6.flowlabel;
148
149 inet->inet_dport = usin->sin6_port;
150
151 /*
152 * Check for a route to destination an obtain the
153 * destination cache for it.
154 */
155
156 fl6.flowi6_proto = sk->sk_protocol;
157 fl6.daddr = np->daddr;
158 fl6.saddr = np->saddr;
159 fl6.flowi6_oif = sk->sk_bound_dev_if;
160 fl6.flowi6_mark = sk->sk_mark;
161 fl6.fl6_dport = inet->inet_dport;
162 fl6.fl6_sport = inet->inet_sport;
163
164 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
165 fl6.flowi6_oif = np->mcast_oif;
166
167 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
168
169 opt = flowlabel ? flowlabel->opt : np->opt;
170 final_p = fl6_update_dst(&fl6, opt, &final);
171
172 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
173 err = 0;
174 if (IS_ERR(dst)) {
175 err = PTR_ERR(dst);
176 goto out;
177 }
178
179 /* source address lookup done in ip6_dst_lookup */
180
181 if (ipv6_addr_any(&np->saddr))
182 np->saddr = fl6.saddr;
183
184 if (ipv6_addr_any(&np->rcv_saddr)) {
185 np->rcv_saddr = fl6.saddr;
186 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
187 if (sk->sk_prot->rehash)
188 sk->sk_prot->rehash(sk);
189 }
190
191 ip6_dst_store(sk, dst,
192 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
193 &np->daddr : NULL,
194 #ifdef CONFIG_IPV6_SUBTREES
195 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
196 &np->saddr :
197 #endif
198 NULL);
199
200 sk->sk_state = TCP_ESTABLISHED;
201 out:
202 fl6_sock_release(flowlabel);
203 return err;
204 }
205
206 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
207 __be16 port, u32 info, u8 *payload)
208 {
209 struct ipv6_pinfo *np = inet6_sk(sk);
210 struct icmp6hdr *icmph = icmp6_hdr(skb);
211 struct sock_exterr_skb *serr;
212
213 if (!np->recverr)
214 return;
215
216 skb = skb_clone(skb, GFP_ATOMIC);
217 if (!skb)
218 return;
219
220 skb->protocol = htons(ETH_P_IPV6);
221
222 serr = SKB_EXT_ERR(skb);
223 serr->ee.ee_errno = err;
224 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
225 serr->ee.ee_type = icmph->icmp6_type;
226 serr->ee.ee_code = icmph->icmp6_code;
227 serr->ee.ee_pad = 0;
228 serr->ee.ee_info = info;
229 serr->ee.ee_data = 0;
230 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
231 skb_network_header(skb);
232 serr->port = port;
233
234 __skb_pull(skb, payload - skb->data);
235 skb_reset_transport_header(skb);
236
237 if (sock_queue_err_skb(sk, skb))
238 kfree_skb(skb);
239 }
240
241 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
242 {
243 struct ipv6_pinfo *np = inet6_sk(sk);
244 struct sock_exterr_skb *serr;
245 struct ipv6hdr *iph;
246 struct sk_buff *skb;
247
248 if (!np->recverr)
249 return;
250
251 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
252 if (!skb)
253 return;
254
255 skb->protocol = htons(ETH_P_IPV6);
256
257 skb_put(skb, sizeof(struct ipv6hdr));
258 skb_reset_network_header(skb);
259 iph = ipv6_hdr(skb);
260 iph->daddr = fl6->daddr;
261
262 serr = SKB_EXT_ERR(skb);
263 serr->ee.ee_errno = err;
264 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
265 serr->ee.ee_type = 0;
266 serr->ee.ee_code = 0;
267 serr->ee.ee_pad = 0;
268 serr->ee.ee_info = info;
269 serr->ee.ee_data = 0;
270 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
271 serr->port = fl6->fl6_dport;
272
273 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
274 skb_reset_transport_header(skb);
275
276 if (sock_queue_err_skb(sk, skb))
277 kfree_skb(skb);
278 }
279
280 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
281 {
282 struct ipv6_pinfo *np = inet6_sk(sk);
283 struct ipv6hdr *iph;
284 struct sk_buff *skb;
285 struct ip6_mtuinfo *mtu_info;
286
287 if (!np->rxopt.bits.rxpmtu)
288 return;
289
290 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
291 if (!skb)
292 return;
293
294 skb_put(skb, sizeof(struct ipv6hdr));
295 skb_reset_network_header(skb);
296 iph = ipv6_hdr(skb);
297 iph->daddr = fl6->daddr;
298
299 mtu_info = IP6CBMTU(skb);
300
301 mtu_info->ip6m_mtu = mtu;
302 mtu_info->ip6m_addr.sin6_family = AF_INET6;
303 mtu_info->ip6m_addr.sin6_port = 0;
304 mtu_info->ip6m_addr.sin6_flowinfo = 0;
305 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
306 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
307
308 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
309 skb_reset_transport_header(skb);
310
311 skb = xchg(&np->rxpmtu, skb);
312 kfree_skb(skb);
313 }
314
315 /*
316 * Handle MSG_ERRQUEUE
317 */
318 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
319 {
320 struct ipv6_pinfo *np = inet6_sk(sk);
321 struct sock_exterr_skb *serr;
322 struct sk_buff *skb, *skb2;
323 struct sockaddr_in6 *sin;
324 struct {
325 struct sock_extended_err ee;
326 struct sockaddr_in6 offender;
327 } errhdr;
328 int err;
329 int copied;
330
331 err = -EAGAIN;
332 skb = skb_dequeue(&sk->sk_error_queue);
333 if (skb == NULL)
334 goto out;
335
336 copied = skb->len;
337 if (copied > len) {
338 msg->msg_flags |= MSG_TRUNC;
339 copied = len;
340 }
341 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
342 if (err)
343 goto out_free_skb;
344
345 sock_recv_timestamp(msg, sk, skb);
346
347 serr = SKB_EXT_ERR(skb);
348
349 sin = (struct sockaddr_in6 *)msg->msg_name;
350 if (sin) {
351 const unsigned char *nh = skb_network_header(skb);
352 sin->sin6_family = AF_INET6;
353 sin->sin6_flowinfo = 0;
354 sin->sin6_port = serr->port;
355 sin->sin6_scope_id = 0;
356 if (skb->protocol == htons(ETH_P_IPV6)) {
357 sin->sin6_addr =
358 *(struct in6_addr *)(nh + serr->addr_offset);
359 if (np->sndflow)
360 sin->sin6_flowinfo =
361 (*(__be32 *)(nh + serr->addr_offset - 24) &
362 IPV6_FLOWINFO_MASK);
363 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
364 sin->sin6_scope_id = IP6CB(skb)->iif;
365 } else {
366 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
367 &sin->sin6_addr);
368 }
369 }
370
371 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
372 sin = &errhdr.offender;
373 sin->sin6_family = AF_UNSPEC;
374 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
375 sin->sin6_family = AF_INET6;
376 sin->sin6_flowinfo = 0;
377 sin->sin6_scope_id = 0;
378 if (skb->protocol == htons(ETH_P_IPV6)) {
379 sin->sin6_addr = ipv6_hdr(skb)->saddr;
380 if (np->rxopt.all)
381 datagram_recv_ctl(sk, msg, skb);
382 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
383 sin->sin6_scope_id = IP6CB(skb)->iif;
384 } else {
385 struct inet_sock *inet = inet_sk(sk);
386
387 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
388 &sin->sin6_addr);
389 if (inet->cmsg_flags)
390 ip_cmsg_recv(msg, skb);
391 }
392 }
393
394 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
395
396 /* Now we could try to dump offended packet options */
397
398 msg->msg_flags |= MSG_ERRQUEUE;
399 err = copied;
400
401 /* Reset and regenerate socket error */
402 spin_lock_bh(&sk->sk_error_queue.lock);
403 sk->sk_err = 0;
404 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
405 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
406 spin_unlock_bh(&sk->sk_error_queue.lock);
407 sk->sk_error_report(sk);
408 } else {
409 spin_unlock_bh(&sk->sk_error_queue.lock);
410 }
411
412 out_free_skb:
413 kfree_skb(skb);
414 out:
415 return err;
416 }
417
418 /*
419 * Handle IPV6_RECVPATHMTU
420 */
421 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len)
422 {
423 struct ipv6_pinfo *np = inet6_sk(sk);
424 struct sk_buff *skb;
425 struct sockaddr_in6 *sin;
426 struct ip6_mtuinfo mtu_info;
427 int err;
428 int copied;
429
430 err = -EAGAIN;
431 skb = xchg(&np->rxpmtu, NULL);
432 if (skb == NULL)
433 goto out;
434
435 copied = skb->len;
436 if (copied > len) {
437 msg->msg_flags |= MSG_TRUNC;
438 copied = len;
439 }
440 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
441 if (err)
442 goto out_free_skb;
443
444 sock_recv_timestamp(msg, sk, skb);
445
446 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
447
448 sin = (struct sockaddr_in6 *)msg->msg_name;
449 if (sin) {
450 sin->sin6_family = AF_INET6;
451 sin->sin6_flowinfo = 0;
452 sin->sin6_port = 0;
453 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
454 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
455 }
456
457 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
458
459 err = copied;
460
461 out_free_skb:
462 kfree_skb(skb);
463 out:
464 return err;
465 }
466
467
468 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
469 {
470 struct ipv6_pinfo *np = inet6_sk(sk);
471 struct inet6_skb_parm *opt = IP6CB(skb);
472 unsigned char *nh = skb_network_header(skb);
473
474 if (np->rxopt.bits.rxinfo) {
475 struct in6_pktinfo src_info;
476
477 src_info.ipi6_ifindex = opt->iif;
478 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
479 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
480 }
481
482 if (np->rxopt.bits.rxhlim) {
483 int hlim = ipv6_hdr(skb)->hop_limit;
484 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
485 }
486
487 if (np->rxopt.bits.rxtclass) {
488 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
489 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
490 }
491
492 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
493 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
494 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
495 }
496
497 /* HbH is allowed only once */
498 if (np->rxopt.bits.hopopts && opt->hop) {
499 u8 *ptr = nh + opt->hop;
500 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
501 }
502
503 if (opt->lastopt &&
504 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
505 /*
506 * Silly enough, but we need to reparse in order to
507 * report extension headers (except for HbH)
508 * in order.
509 *
510 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
511 * (and WILL NOT be) defined because
512 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
513 */
514 unsigned int off = sizeof(struct ipv6hdr);
515 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
516
517 while (off <= opt->lastopt) {
518 unsigned len;
519 u8 *ptr = nh + off;
520
521 switch(nexthdr) {
522 case IPPROTO_DSTOPTS:
523 nexthdr = ptr[0];
524 len = (ptr[1] + 1) << 3;
525 if (np->rxopt.bits.dstopts)
526 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
527 break;
528 case IPPROTO_ROUTING:
529 nexthdr = ptr[0];
530 len = (ptr[1] + 1) << 3;
531 if (np->rxopt.bits.srcrt)
532 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
533 break;
534 case IPPROTO_AH:
535 nexthdr = ptr[0];
536 len = (ptr[1] + 2) << 2;
537 break;
538 default:
539 nexthdr = ptr[0];
540 len = (ptr[1] + 1) << 3;
541 break;
542 }
543
544 off += len;
545 }
546 }
547
548 /* socket options in old style */
549 if (np->rxopt.bits.rxoinfo) {
550 struct in6_pktinfo src_info;
551
552 src_info.ipi6_ifindex = opt->iif;
553 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
554 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
555 }
556 if (np->rxopt.bits.rxohlim) {
557 int hlim = ipv6_hdr(skb)->hop_limit;
558 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
559 }
560 if (np->rxopt.bits.ohopopts && opt->hop) {
561 u8 *ptr = nh + opt->hop;
562 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
563 }
564 if (np->rxopt.bits.odstopts && opt->dst0) {
565 u8 *ptr = nh + opt->dst0;
566 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
567 }
568 if (np->rxopt.bits.osrcrt && opt->srcrt) {
569 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
570 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
571 }
572 if (np->rxopt.bits.odstopts && opt->dst1) {
573 u8 *ptr = nh + opt->dst1;
574 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
575 }
576 if (np->rxopt.bits.rxorigdstaddr) {
577 struct sockaddr_in6 sin6;
578 __be16 *ports = (__be16 *) skb_transport_header(skb);
579
580 if (skb_transport_offset(skb) + 4 <= skb->len) {
581 /* All current transport protocols have the port numbers in the
582 * first four bytes of the transport header and this function is
583 * written with this assumption in mind.
584 */
585
586 sin6.sin6_family = AF_INET6;
587 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
588 sin6.sin6_port = ports[1];
589 sin6.sin6_flowinfo = 0;
590 sin6.sin6_scope_id = 0;
591
592 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
593 }
594 }
595 return 0;
596 }
597
598 int datagram_send_ctl(struct net *net, struct sock *sk,
599 struct msghdr *msg, struct flowi6 *fl6,
600 struct ipv6_txoptions *opt,
601 int *hlimit, int *tclass, int *dontfrag)
602 {
603 struct in6_pktinfo *src_info;
604 struct cmsghdr *cmsg;
605 struct ipv6_rt_hdr *rthdr;
606 struct ipv6_opt_hdr *hdr;
607 int len;
608 int err = 0;
609
610 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
611 int addr_type;
612
613 if (!CMSG_OK(msg, cmsg)) {
614 err = -EINVAL;
615 goto exit_f;
616 }
617
618 if (cmsg->cmsg_level != SOL_IPV6)
619 continue;
620
621 switch (cmsg->cmsg_type) {
622 case IPV6_PKTINFO:
623 case IPV6_2292PKTINFO:
624 {
625 struct net_device *dev = NULL;
626
627 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
628 err = -EINVAL;
629 goto exit_f;
630 }
631
632 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
633
634 if (src_info->ipi6_ifindex) {
635 if (fl6->flowi6_oif &&
636 src_info->ipi6_ifindex != fl6->flowi6_oif)
637 return -EINVAL;
638 fl6->flowi6_oif = src_info->ipi6_ifindex;
639 }
640
641 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
642
643 rcu_read_lock();
644 if (fl6->flowi6_oif) {
645 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
646 if (!dev) {
647 rcu_read_unlock();
648 return -ENODEV;
649 }
650 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
651 rcu_read_unlock();
652 return -EINVAL;
653 }
654
655 if (addr_type != IPV6_ADDR_ANY) {
656 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
657 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
658 !ipv6_chk_addr(net, &src_info->ipi6_addr,
659 strict ? dev : NULL, 0))
660 err = -EINVAL;
661 else
662 fl6->saddr = src_info->ipi6_addr;
663 }
664
665 rcu_read_unlock();
666
667 if (err)
668 goto exit_f;
669
670 break;
671 }
672
673 case IPV6_FLOWINFO:
674 if (cmsg->cmsg_len < CMSG_LEN(4)) {
675 err = -EINVAL;
676 goto exit_f;
677 }
678
679 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
680 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
681 err = -EINVAL;
682 goto exit_f;
683 }
684 }
685 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
686 break;
687
688 case IPV6_2292HOPOPTS:
689 case IPV6_HOPOPTS:
690 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
691 err = -EINVAL;
692 goto exit_f;
693 }
694
695 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
696 len = ((hdr->hdrlen + 1) << 3);
697 if (cmsg->cmsg_len < CMSG_LEN(len)) {
698 err = -EINVAL;
699 goto exit_f;
700 }
701 if (!capable(CAP_NET_RAW)) {
702 err = -EPERM;
703 goto exit_f;
704 }
705 opt->opt_nflen += len;
706 opt->hopopt = hdr;
707 break;
708
709 case IPV6_2292DSTOPTS:
710 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
711 err = -EINVAL;
712 goto exit_f;
713 }
714
715 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
716 len = ((hdr->hdrlen + 1) << 3);
717 if (cmsg->cmsg_len < CMSG_LEN(len)) {
718 err = -EINVAL;
719 goto exit_f;
720 }
721 if (!capable(CAP_NET_RAW)) {
722 err = -EPERM;
723 goto exit_f;
724 }
725 if (opt->dst1opt) {
726 err = -EINVAL;
727 goto exit_f;
728 }
729 opt->opt_flen += len;
730 opt->dst1opt = hdr;
731 break;
732
733 case IPV6_DSTOPTS:
734 case IPV6_RTHDRDSTOPTS:
735 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
736 err = -EINVAL;
737 goto exit_f;
738 }
739
740 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
741 len = ((hdr->hdrlen + 1) << 3);
742 if (cmsg->cmsg_len < CMSG_LEN(len)) {
743 err = -EINVAL;
744 goto exit_f;
745 }
746 if (!capable(CAP_NET_RAW)) {
747 err = -EPERM;
748 goto exit_f;
749 }
750 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
751 opt->opt_flen += len;
752 opt->dst1opt = hdr;
753 } else {
754 opt->opt_nflen += len;
755 opt->dst0opt = hdr;
756 }
757 break;
758
759 case IPV6_2292RTHDR:
760 case IPV6_RTHDR:
761 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
762 err = -EINVAL;
763 goto exit_f;
764 }
765
766 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
767
768 switch (rthdr->type) {
769 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
770 case IPV6_SRCRT_TYPE_2:
771 if (rthdr->hdrlen != 2 ||
772 rthdr->segments_left != 1) {
773 err = -EINVAL;
774 goto exit_f;
775 }
776 break;
777 #endif
778 default:
779 err = -EINVAL;
780 goto exit_f;
781 }
782
783 len = ((rthdr->hdrlen + 1) << 3);
784
785 if (cmsg->cmsg_len < CMSG_LEN(len)) {
786 err = -EINVAL;
787 goto exit_f;
788 }
789
790 /* segments left must also match */
791 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
792 err = -EINVAL;
793 goto exit_f;
794 }
795
796 opt->opt_nflen += len;
797 opt->srcrt = rthdr;
798
799 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
800 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
801
802 opt->opt_nflen += dsthdrlen;
803 opt->dst0opt = opt->dst1opt;
804 opt->dst1opt = NULL;
805 opt->opt_flen -= dsthdrlen;
806 }
807
808 break;
809
810 case IPV6_2292HOPLIMIT:
811 case IPV6_HOPLIMIT:
812 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
813 err = -EINVAL;
814 goto exit_f;
815 }
816
817 *hlimit = *(int *)CMSG_DATA(cmsg);
818 if (*hlimit < -1 || *hlimit > 0xff) {
819 err = -EINVAL;
820 goto exit_f;
821 }
822
823 break;
824
825 case IPV6_TCLASS:
826 {
827 int tc;
828
829 err = -EINVAL;
830 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
831 goto exit_f;
832 }
833
834 tc = *(int *)CMSG_DATA(cmsg);
835 if (tc < -1 || tc > 0xff)
836 goto exit_f;
837
838 err = 0;
839 *tclass = tc;
840
841 break;
842 }
843
844 case IPV6_DONTFRAG:
845 {
846 int df;
847
848 err = -EINVAL;
849 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
850 goto exit_f;
851 }
852
853 df = *(int *)CMSG_DATA(cmsg);
854 if (df < 0 || df > 1)
855 goto exit_f;
856
857 err = 0;
858 *dontfrag = df;
859
860 break;
861 }
862 default:
863 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
864 cmsg->cmsg_type);
865 err = -EINVAL;
866 goto exit_f;
867 }
868 }
869
870 exit_f:
871 return err;
872 }