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MIPS: SB1250: Include correct header and fix a warning
[linux-2.6/linux-mips.git] / net / ipv6 / datagram.c
blob622dc7939a1b3fd1f759a6740eff7d01562c1a00
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 = NULL, final;
42 struct dst_entry *dst;
43 struct flowi fl;
44 struct ip6_flowlabel *flowlabel = NULL;
45 int addr_type;
46 int err;
47
48 if (usin->sin6_family == AF_INET) {
49 if (__ipv6_only_sock(sk))
50 return -EAFNOSUPPORT;
51 err = ip4_datagram_connect(sk, uaddr, addr_len);
52 goto ipv4_connected;
53 }
54
55 if (addr_len < SIN6_LEN_RFC2133)
56 return -EINVAL;
57
58 if (usin->sin6_family != AF_INET6)
59 return -EAFNOSUPPORT;
60
61 memset(&fl, 0, sizeof(fl));
62 if (np->sndflow) {
63 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
64 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
65 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
66 if (flowlabel == NULL)
67 return -EINVAL;
68 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
69 }
70 }
71
72 addr_type = ipv6_addr_type(&usin->sin6_addr);
73
74 if (addr_type == IPV6_ADDR_ANY) {
75 /*
76 * connect to self
77 */
78 usin->sin6_addr.s6_addr[15] = 0x01;
79 }
80
81 daddr = &usin->sin6_addr;
82
83 if (addr_type == IPV6_ADDR_MAPPED) {
84 struct sockaddr_in sin;
85
86 if (__ipv6_only_sock(sk)) {
87 err = -ENETUNREACH;
88 goto out;
89 }
90 sin.sin_family = AF_INET;
91 sin.sin_addr.s_addr = daddr->s6_addr32[3];
92 sin.sin_port = usin->sin6_port;
93
94 err = ip4_datagram_connect(sk,
95 (struct sockaddr*) &sin,
96 sizeof(sin));
97
98 ipv4_connected:
99 if (err)
100 goto out;
101
102 ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr);
103
104 if (ipv6_addr_any(&np->saddr))
105 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
106
107 if (ipv6_addr_any(&np->rcv_saddr))
108 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
109 &np->rcv_saddr);
110
111 goto out;
112 }
113
114 if (addr_type&IPV6_ADDR_LINKLOCAL) {
115 if (addr_len >= sizeof(struct sockaddr_in6) &&
116 usin->sin6_scope_id) {
117 if (sk->sk_bound_dev_if &&
118 sk->sk_bound_dev_if != usin->sin6_scope_id) {
119 err = -EINVAL;
120 goto out;
121 }
122 sk->sk_bound_dev_if = usin->sin6_scope_id;
123 }
124
125 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
126 sk->sk_bound_dev_if = np->mcast_oif;
127
128 /* Connect to link-local address requires an interface */
129 if (!sk->sk_bound_dev_if) {
130 err = -EINVAL;
131 goto out;
132 }
133 }
134
135 ipv6_addr_copy(&np->daddr, daddr);
136 np->flow_label = fl.fl6_flowlabel;
137
138 inet->inet_dport = usin->sin6_port;
139
140 /*
141 * Check for a route to destination an obtain the
142 * destination cache for it.
143 */
144
145 fl.proto = sk->sk_protocol;
146 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
147 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
148 fl.oif = sk->sk_bound_dev_if;
149 fl.mark = sk->sk_mark;
150 fl.fl_ip_dport = inet->inet_dport;
151 fl.fl_ip_sport = inet->inet_sport;
152
153 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
154 fl.oif = np->mcast_oif;
155
156 security_sk_classify_flow(sk, &fl);
157
158 if (flowlabel) {
159 if (flowlabel->opt && flowlabel->opt->srcrt) {
160 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
161 ipv6_addr_copy(&final, &fl.fl6_dst);
162 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
163 final_p = &final;
164 }
165 } else if (np->opt && np->opt->srcrt) {
166 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
167 ipv6_addr_copy(&final, &fl.fl6_dst);
168 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
169 final_p = &final;
170 }
171
172 err = ip6_dst_lookup(sk, &dst, &fl);
173 if (err)
174 goto out;
175 if (final_p)
176 ipv6_addr_copy(&fl.fl6_dst, final_p);
177
178 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
179 if (err < 0) {
180 if (err == -EREMOTE)
181 err = ip6_dst_blackhole(sk, &dst, &fl);
182 if (err < 0)
183 goto out;
184 }
185
186 /* source address lookup done in ip6_dst_lookup */
187
188 if (ipv6_addr_any(&np->saddr))
189 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
190
191 if (ipv6_addr_any(&np->rcv_saddr)) {
192 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
193 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
194 }
195
196 ip6_dst_store(sk, dst,
197 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
198 &np->daddr : NULL,
199 #ifdef CONFIG_IPV6_SUBTREES
200 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
201 &np->saddr :
202 #endif
203 NULL);
204
205 sk->sk_state = TCP_ESTABLISHED;
206 out:
207 fl6_sock_release(flowlabel);
208 return err;
209 }
210
211 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
212 __be16 port, u32 info, u8 *payload)
213 {
214 struct ipv6_pinfo *np = inet6_sk(sk);
215 struct icmp6hdr *icmph = icmp6_hdr(skb);
216 struct sock_exterr_skb *serr;
217
218 if (!np->recverr)
219 return;
220
221 skb = skb_clone(skb, GFP_ATOMIC);
222 if (!skb)
223 return;
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 flowi *fl, 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_put(skb, sizeof(struct ipv6hdr));
259 skb_reset_network_header(skb);
260 iph = ipv6_hdr(skb);
261 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
262
263 serr = SKB_EXT_ERR(skb);
264 serr->ee.ee_errno = err;
265 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
266 serr->ee.ee_type = 0;
267 serr->ee.ee_code = 0;
268 serr->ee.ee_pad = 0;
269 serr->ee.ee_info = info;
270 serr->ee.ee_data = 0;
271 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
272 serr->port = fl->fl_ip_dport;
273
274 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
275 skb_reset_transport_header(skb);
276
277 if (sock_queue_err_skb(sk, skb))
278 kfree_skb(skb);
279 }
280
281 /*
282 * Handle MSG_ERRQUEUE
283 */
284 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
285 {
286 struct ipv6_pinfo *np = inet6_sk(sk);
287 struct sock_exterr_skb *serr;
288 struct sk_buff *skb, *skb2;
289 struct sockaddr_in6 *sin;
290 struct {
291 struct sock_extended_err ee;
292 struct sockaddr_in6 offender;
293 } errhdr;
294 int err;
295 int copied;
296
297 err = -EAGAIN;
298 skb = skb_dequeue(&sk->sk_error_queue);
299 if (skb == NULL)
300 goto out;
301
302 copied = skb->len;
303 if (copied > len) {
304 msg->msg_flags |= MSG_TRUNC;
305 copied = len;
306 }
307 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
308 if (err)
309 goto out_free_skb;
310
311 sock_recv_timestamp(msg, sk, skb);
312
313 serr = SKB_EXT_ERR(skb);
314
315 sin = (struct sockaddr_in6 *)msg->msg_name;
316 if (sin) {
317 const unsigned char *nh = skb_network_header(skb);
318 sin->sin6_family = AF_INET6;
319 sin->sin6_flowinfo = 0;
320 sin->sin6_port = serr->port;
321 sin->sin6_scope_id = 0;
322 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
323 ipv6_addr_copy(&sin->sin6_addr,
324 (struct in6_addr *)(nh + serr->addr_offset));
325 if (np->sndflow)
326 sin->sin6_flowinfo =
327 (*(__be32 *)(nh + serr->addr_offset - 24) &
328 IPV6_FLOWINFO_MASK);
329 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
330 sin->sin6_scope_id = IP6CB(skb)->iif;
331 } else {
332 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
333 &sin->sin6_addr);
334 }
335 }
336
337 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
338 sin = &errhdr.offender;
339 sin->sin6_family = AF_UNSPEC;
340 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
341 sin->sin6_family = AF_INET6;
342 sin->sin6_flowinfo = 0;
343 sin->sin6_scope_id = 0;
344 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
345 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
346 if (np->rxopt.all)
347 datagram_recv_ctl(sk, msg, skb);
348 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
349 sin->sin6_scope_id = IP6CB(skb)->iif;
350 } else {
351 struct inet_sock *inet = inet_sk(sk);
352
353 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
354 &sin->sin6_addr);
355 if (inet->cmsg_flags)
356 ip_cmsg_recv(msg, skb);
357 }
358 }
359
360 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
361
362 /* Now we could try to dump offended packet options */
363
364 msg->msg_flags |= MSG_ERRQUEUE;
365 err = copied;
366
367 /* Reset and regenerate socket error */
368 spin_lock_bh(&sk->sk_error_queue.lock);
369 sk->sk_err = 0;
370 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
371 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
372 spin_unlock_bh(&sk->sk_error_queue.lock);
373 sk->sk_error_report(sk);
374 } else {
375 spin_unlock_bh(&sk->sk_error_queue.lock);
376 }
377
378 out_free_skb:
379 kfree_skb(skb);
380 out:
381 return err;
382 }
383
384
385
386 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
387 {
388 struct ipv6_pinfo *np = inet6_sk(sk);
389 struct inet6_skb_parm *opt = IP6CB(skb);
390 unsigned char *nh = skb_network_header(skb);
391
392 if (np->rxopt.bits.rxinfo) {
393 struct in6_pktinfo src_info;
394
395 src_info.ipi6_ifindex = opt->iif;
396 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
397 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
398 }
399
400 if (np->rxopt.bits.rxhlim) {
401 int hlim = ipv6_hdr(skb)->hop_limit;
402 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
403 }
404
405 if (np->rxopt.bits.rxtclass) {
406 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
407 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
408 }
409
410 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
411 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
412 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
413 }
414
415 /* HbH is allowed only once */
416 if (np->rxopt.bits.hopopts && opt->hop) {
417 u8 *ptr = nh + opt->hop;
418 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
419 }
420
421 if (opt->lastopt &&
422 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
423 /*
424 * Silly enough, but we need to reparse in order to
425 * report extension headers (except for HbH)
426 * in order.
427 *
428 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
429 * (and WILL NOT be) defined because
430 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
431 */
432 unsigned int off = sizeof(struct ipv6hdr);
433 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
434
435 while (off <= opt->lastopt) {
436 unsigned len;
437 u8 *ptr = nh + off;
438
439 switch(nexthdr) {
440 case IPPROTO_DSTOPTS:
441 nexthdr = ptr[0];
442 len = (ptr[1] + 1) << 3;
443 if (np->rxopt.bits.dstopts)
444 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
445 break;
446 case IPPROTO_ROUTING:
447 nexthdr = ptr[0];
448 len = (ptr[1] + 1) << 3;
449 if (np->rxopt.bits.srcrt)
450 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
451 break;
452 case IPPROTO_AH:
453 nexthdr = ptr[0];
454 len = (ptr[1] + 2) << 2;
455 break;
456 default:
457 nexthdr = ptr[0];
458 len = (ptr[1] + 1) << 3;
459 break;
460 }
461
462 off += len;
463 }
464 }
465
466 /* socket options in old style */
467 if (np->rxopt.bits.rxoinfo) {
468 struct in6_pktinfo src_info;
469
470 src_info.ipi6_ifindex = opt->iif;
471 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
472 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
473 }
474 if (np->rxopt.bits.rxohlim) {
475 int hlim = ipv6_hdr(skb)->hop_limit;
476 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
477 }
478 if (np->rxopt.bits.ohopopts && opt->hop) {
479 u8 *ptr = nh + opt->hop;
480 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
481 }
482 if (np->rxopt.bits.odstopts && opt->dst0) {
483 u8 *ptr = nh + opt->dst0;
484 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
485 }
486 if (np->rxopt.bits.osrcrt && opt->srcrt) {
487 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
488 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
489 }
490 if (np->rxopt.bits.odstopts && opt->dst1) {
491 u8 *ptr = nh + opt->dst1;
492 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
493 }
494 return 0;
495 }
496
497 int datagram_send_ctl(struct net *net,
498 struct msghdr *msg, struct flowi *fl,
499 struct ipv6_txoptions *opt,
500 int *hlimit, int *tclass)
501 {
502 struct in6_pktinfo *src_info;
503 struct cmsghdr *cmsg;
504 struct ipv6_rt_hdr *rthdr;
505 struct ipv6_opt_hdr *hdr;
506 int len;
507 int err = 0;
508
509 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
510 int addr_type;
511
512 if (!CMSG_OK(msg, cmsg)) {
513 err = -EINVAL;
514 goto exit_f;
515 }
516
517 if (cmsg->cmsg_level != SOL_IPV6)
518 continue;
519
520 switch (cmsg->cmsg_type) {
521 case IPV6_PKTINFO:
522 case IPV6_2292PKTINFO:
523 {
524 struct net_device *dev = NULL;
525
526 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
527 err = -EINVAL;
528 goto exit_f;
529 }
530
531 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
532
533 if (src_info->ipi6_ifindex) {
534 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
535 return -EINVAL;
536 fl->oif = src_info->ipi6_ifindex;
537 }
538
539 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
540
541 rcu_read_lock();
542 if (fl->oif) {
543 dev = dev_get_by_index_rcu(net, fl->oif);
544 if (!dev) {
545 rcu_read_unlock();
546 return -ENODEV;
547 }
548 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
549 rcu_read_unlock();
550 return -EINVAL;
551 }
552
553 if (addr_type != IPV6_ADDR_ANY) {
554 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
555 if (!ipv6_chk_addr(net, &src_info->ipi6_addr,
556 strict ? dev : NULL, 0))
557 err = -EINVAL;
558 else
559 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
560 }
561
562 rcu_read_unlock();
563
564 if (err)
565 goto exit_f;
566
567 break;
568 }
569
570 case IPV6_FLOWINFO:
571 if (cmsg->cmsg_len < CMSG_LEN(4)) {
572 err = -EINVAL;
573 goto exit_f;
574 }
575
576 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
577 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
578 err = -EINVAL;
579 goto exit_f;
580 }
581 }
582 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
583 break;
584
585 case IPV6_2292HOPOPTS:
586 case IPV6_HOPOPTS:
587 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
588 err = -EINVAL;
589 goto exit_f;
590 }
591
592 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
593 len = ((hdr->hdrlen + 1) << 3);
594 if (cmsg->cmsg_len < CMSG_LEN(len)) {
595 err = -EINVAL;
596 goto exit_f;
597 }
598 if (!capable(CAP_NET_RAW)) {
599 err = -EPERM;
600 goto exit_f;
601 }
602 opt->opt_nflen += len;
603 opt->hopopt = hdr;
604 break;
605
606 case IPV6_2292DSTOPTS:
607 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
608 err = -EINVAL;
609 goto exit_f;
610 }
611
612 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
613 len = ((hdr->hdrlen + 1) << 3);
614 if (cmsg->cmsg_len < CMSG_LEN(len)) {
615 err = -EINVAL;
616 goto exit_f;
617 }
618 if (!capable(CAP_NET_RAW)) {
619 err = -EPERM;
620 goto exit_f;
621 }
622 if (opt->dst1opt) {
623 err = -EINVAL;
624 goto exit_f;
625 }
626 opt->opt_flen += len;
627 opt->dst1opt = hdr;
628 break;
629
630 case IPV6_DSTOPTS:
631 case IPV6_RTHDRDSTOPTS:
632 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
633 err = -EINVAL;
634 goto exit_f;
635 }
636
637 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
638 len = ((hdr->hdrlen + 1) << 3);
639 if (cmsg->cmsg_len < CMSG_LEN(len)) {
640 err = -EINVAL;
641 goto exit_f;
642 }
643 if (!capable(CAP_NET_RAW)) {
644 err = -EPERM;
645 goto exit_f;
646 }
647 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
648 opt->opt_flen += len;
649 opt->dst1opt = hdr;
650 } else {
651 opt->opt_nflen += len;
652 opt->dst0opt = hdr;
653 }
654 break;
655
656 case IPV6_2292RTHDR:
657 case IPV6_RTHDR:
658 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
659 err = -EINVAL;
660 goto exit_f;
661 }
662
663 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
664
665 switch (rthdr->type) {
666 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
667 case IPV6_SRCRT_TYPE_2:
668 if (rthdr->hdrlen != 2 ||
669 rthdr->segments_left != 1) {
670 err = -EINVAL;
671 goto exit_f;
672 }
673 break;
674 #endif
675 default:
676 err = -EINVAL;
677 goto exit_f;
678 }
679
680 len = ((rthdr->hdrlen + 1) << 3);
681
682 if (cmsg->cmsg_len < CMSG_LEN(len)) {
683 err = -EINVAL;
684 goto exit_f;
685 }
686
687 /* segments left must also match */
688 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
689 err = -EINVAL;
690 goto exit_f;
691 }
692
693 opt->opt_nflen += len;
694 opt->srcrt = rthdr;
695
696 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
697 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
698
699 opt->opt_nflen += dsthdrlen;
700 opt->dst0opt = opt->dst1opt;
701 opt->dst1opt = NULL;
702 opt->opt_flen -= dsthdrlen;
703 }
704
705 break;
706
707 case IPV6_2292HOPLIMIT:
708 case IPV6_HOPLIMIT:
709 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
710 err = -EINVAL;
711 goto exit_f;
712 }
713
714 *hlimit = *(int *)CMSG_DATA(cmsg);
715 if (*hlimit < -1 || *hlimit > 0xff) {
716 err = -EINVAL;
717 goto exit_f;
718 }
719
720 break;
721
722 case IPV6_TCLASS:
723 {
724 int tc;
725
726 err = -EINVAL;
727 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
728 goto exit_f;
729 }
730
731 tc = *(int *)CMSG_DATA(cmsg);
732 if (tc < -1 || tc > 0xff)
733 goto exit_f;
734
735 err = 0;
736 *tclass = tc;
737
738 break;
739 }
740 default:
741 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
742 cmsg->cmsg_type);
743 err = -EINVAL;
744 goto exit_f;
745 }
746 }
747
748 exit_f:
749 return err;
750 }
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