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Linux v2.6.17-rc2
[linux-2.6/next.git] / net / ipv6 / datagram.c
blob99a6eb23378bcc2d3b079ce3bc5ff7efd8e9ff58
1 /*
2 * common UDP/RAW code
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * $Id: datagram.c,v 1.24 2002/02/01 22:01:04 davem Exp $
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 #include <linux/capability.h>
17 #include <linux/errno.h>
18 #include <linux/types.h>
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
21 #include <linux/interrupt.h>
22 #include <linux/socket.h>
23 #include <linux/sockios.h>
24 #include <linux/in6.h>
25 #include <linux/ipv6.h>
26 #include <linux/route.h>
27
28 #include <net/ipv6.h>
29 #include <net/ndisc.h>
30 #include <net/addrconf.h>
31 #include <net/transp_v6.h>
32 #include <net/ip6_route.h>
33 #include <net/tcp_states.h>
34
35 #include <linux/errqueue.h>
36 #include <asm/uaccess.h>
37
38 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
39 {
40 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
41 struct inet_sock *inet = inet_sk(sk);
42 struct ipv6_pinfo *np = inet6_sk(sk);
43 struct in6_addr *daddr, *final_p = NULL, final;
44 struct dst_entry *dst;
45 struct flowi fl;
46 struct ip6_flowlabel *flowlabel = NULL;
47 int addr_type;
48 int err;
49
50 if (usin->sin6_family == AF_INET) {
51 if (__ipv6_only_sock(sk))
52 return -EAFNOSUPPORT;
53 err = ip4_datagram_connect(sk, uaddr, addr_len);
54 goto ipv4_connected;
55 }
56
57 if (addr_len < SIN6_LEN_RFC2133)
58 return -EINVAL;
59
60 if (usin->sin6_family != AF_INET6)
61 return -EAFNOSUPPORT;
62
63 memset(&fl, 0, sizeof(fl));
64 if (np->sndflow) {
65 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
66 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
67 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
68 if (flowlabel == NULL)
69 return -EINVAL;
70 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
71 }
72 }
73
74 addr_type = ipv6_addr_type(&usin->sin6_addr);
75
76 if (addr_type == IPV6_ADDR_ANY) {
77 /*
78 * connect to self
79 */
80 usin->sin6_addr.s6_addr[15] = 0x01;
81 }
82
83 daddr = &usin->sin6_addr;
84
85 if (addr_type == IPV6_ADDR_MAPPED) {
86 struct sockaddr_in sin;
87
88 if (__ipv6_only_sock(sk)) {
89 err = -ENETUNREACH;
90 goto out;
91 }
92 sin.sin_family = AF_INET;
93 sin.sin_addr.s_addr = daddr->s6_addr32[3];
94 sin.sin_port = usin->sin6_port;
95
96 err = ip4_datagram_connect(sk,
97 (struct sockaddr*) &sin,
98 sizeof(sin));
99
100 ipv4_connected:
101 if (err)
102 goto out;
103
104 ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr);
105
106 if (ipv6_addr_any(&np->saddr)) {
107 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff),
108 inet->saddr);
109 }
110
111 if (ipv6_addr_any(&np->rcv_saddr)) {
112 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff),
113 inet->rcv_saddr);
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 if (!sk->sk_bound_dev_if &&
128 (addr_type & IPV6_ADDR_MULTICAST))
129 fl.oif = np->mcast_oif;
130 }
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 = fl.fl6_flowlabel;
141
142 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 fl.proto = sk->sk_protocol;
150 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
151 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
152 fl.oif = sk->sk_bound_dev_if;
153 fl.fl_ip_dport = inet->dport;
154 fl.fl_ip_sport = inet->sport;
155
156 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
157 fl.oif = np->mcast_oif;
158
159 if (flowlabel) {
160 if (flowlabel->opt && flowlabel->opt->srcrt) {
161 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
162 ipv6_addr_copy(&final, &fl.fl6_dst);
163 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
164 final_p = &final;
165 }
166 } else if (np->opt && np->opt->srcrt) {
167 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
168 ipv6_addr_copy(&final, &fl.fl6_dst);
169 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
170 final_p = &final;
171 }
172
173 err = ip6_dst_lookup(sk, &dst, &fl);
174 if (err)
175 goto out;
176 if (final_p)
177 ipv6_addr_copy(&fl.fl6_dst, final_p);
178
179 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
180 goto out;
181
182 /* source address lookup done in ip6_dst_lookup */
183
184 if (ipv6_addr_any(&np->saddr))
185 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
186
187 if (ipv6_addr_any(&np->rcv_saddr)) {
188 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
189 inet->rcv_saddr = LOOPBACK4_IPV6;
190 }
191
192 ip6_dst_store(sk, dst,
193 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
194 &np->daddr : NULL);
195
196 sk->sk_state = TCP_ESTABLISHED;
197 out:
198 fl6_sock_release(flowlabel);
199 return err;
200 }
201
202 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
203 u16 port, u32 info, u8 *payload)
204 {
205 struct ipv6_pinfo *np = inet6_sk(sk);
206 struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw;
207 struct sock_exterr_skb *serr;
208
209 if (!np->recverr)
210 return;
211
212 skb = skb_clone(skb, GFP_ATOMIC);
213 if (!skb)
214 return;
215
216 serr = SKB_EXT_ERR(skb);
217 serr->ee.ee_errno = err;
218 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
219 serr->ee.ee_type = icmph->icmp6_type;
220 serr->ee.ee_code = icmph->icmp6_code;
221 serr->ee.ee_pad = 0;
222 serr->ee.ee_info = info;
223 serr->ee.ee_data = 0;
224 serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw;
225 serr->port = port;
226
227 skb->h.raw = payload;
228 __skb_pull(skb, payload - skb->data);
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 flowi *fl, 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 iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));
249 skb->nh.ipv6h = iph;
250 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
251
252 serr = SKB_EXT_ERR(skb);
253 serr->ee.ee_errno = err;
254 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
255 serr->ee.ee_type = 0;
256 serr->ee.ee_code = 0;
257 serr->ee.ee_pad = 0;
258 serr->ee.ee_info = info;
259 serr->ee.ee_data = 0;
260 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
261 serr->port = fl->fl_ip_dport;
262
263 skb->h.raw = skb->tail;
264 __skb_pull(skb, skb->tail - skb->data);
265
266 if (sock_queue_err_skb(sk, skb))
267 kfree_skb(skb);
268 }
269
270 /*
271 * Handle MSG_ERRQUEUE
272 */
273 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
274 {
275 struct ipv6_pinfo *np = inet6_sk(sk);
276 struct sock_exterr_skb *serr;
277 struct sk_buff *skb, *skb2;
278 struct sockaddr_in6 *sin;
279 struct {
280 struct sock_extended_err ee;
281 struct sockaddr_in6 offender;
282 } errhdr;
283 int err;
284 int copied;
285
286 err = -EAGAIN;
287 skb = skb_dequeue(&sk->sk_error_queue);
288 if (skb == NULL)
289 goto out;
290
291 copied = skb->len;
292 if (copied > len) {
293 msg->msg_flags |= MSG_TRUNC;
294 copied = len;
295 }
296 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
297 if (err)
298 goto out_free_skb;
299
300 sock_recv_timestamp(msg, sk, skb);
301
302 serr = SKB_EXT_ERR(skb);
303
304 sin = (struct sockaddr_in6 *)msg->msg_name;
305 if (sin) {
306 sin->sin6_family = AF_INET6;
307 sin->sin6_flowinfo = 0;
308 sin->sin6_port = serr->port;
309 sin->sin6_scope_id = 0;
310 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
311 ipv6_addr_copy(&sin->sin6_addr,
312 (struct in6_addr *)(skb->nh.raw + serr->addr_offset));
313 if (np->sndflow)
314 sin->sin6_flowinfo = *(u32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
315 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
316 sin->sin6_scope_id = IP6CB(skb)->iif;
317 } else {
318 ipv6_addr_set(&sin->sin6_addr, 0, 0,
319 htonl(0xffff),
320 *(u32*)(skb->nh.raw + serr->addr_offset));
321 }
322 }
323
324 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
325 sin = &errhdr.offender;
326 sin->sin6_family = AF_UNSPEC;
327 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
328 sin->sin6_family = AF_INET6;
329 sin->sin6_flowinfo = 0;
330 sin->sin6_scope_id = 0;
331 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
332 ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr);
333 if (np->rxopt.all)
334 datagram_recv_ctl(sk, msg, skb);
335 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
336 sin->sin6_scope_id = IP6CB(skb)->iif;
337 } else {
338 struct inet_sock *inet = inet_sk(sk);
339
340 ipv6_addr_set(&sin->sin6_addr, 0, 0,
341 htonl(0xffff),
342 skb->nh.iph->saddr);
343 if (inet->cmsg_flags)
344 ip_cmsg_recv(msg, skb);
345 }
346 }
347
348 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
349
350 /* Now we could try to dump offended packet options */
351
352 msg->msg_flags |= MSG_ERRQUEUE;
353 err = copied;
354
355 /* Reset and regenerate socket error */
356 spin_lock_bh(&sk->sk_error_queue.lock);
357 sk->sk_err = 0;
358 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
359 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
360 spin_unlock_bh(&sk->sk_error_queue.lock);
361 sk->sk_error_report(sk);
362 } else {
363 spin_unlock_bh(&sk->sk_error_queue.lock);
364 }
365
366 out_free_skb:
367 kfree_skb(skb);
368 out:
369 return err;
370 }
371
372
373
374 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
375 {
376 struct ipv6_pinfo *np = inet6_sk(sk);
377 struct inet6_skb_parm *opt = IP6CB(skb);
378
379 if (np->rxopt.bits.rxinfo) {
380 struct in6_pktinfo src_info;
381
382 src_info.ipi6_ifindex = opt->iif;
383 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
384 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
385 }
386
387 if (np->rxopt.bits.rxhlim) {
388 int hlim = skb->nh.ipv6h->hop_limit;
389 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
390 }
391
392 if (np->rxopt.bits.rxtclass) {
393 int tclass = (ntohl(*(u32 *)skb->nh.ipv6h) >> 20) & 0xff;
394 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
395 }
396
397 if (np->rxopt.bits.rxflow && (*(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
398 u32 flowinfo = *(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK;
399 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
400 }
401
402 /* HbH is allowed only once */
403 if (np->rxopt.bits.hopopts && opt->hop) {
404 u8 *ptr = skb->nh.raw + opt->hop;
405 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
406 }
407
408 if (opt->lastopt &&
409 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
410 /*
411 * Silly enough, but we need to reparse in order to
412 * report extension headers (except for HbH)
413 * in order.
414 *
415 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
416 * (and WILL NOT be) defined because
417 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
418 */
419 unsigned int off = sizeof(struct ipv6hdr);
420 u8 nexthdr = skb->nh.ipv6h->nexthdr;
421
422 while (off <= opt->lastopt) {
423 unsigned len;
424 u8 *ptr = skb->nh.raw + off;
425
426 switch(nexthdr) {
427 case IPPROTO_DSTOPTS:
428 nexthdr = ptr[0];
429 len = (ptr[1] + 1) << 3;
430 if (np->rxopt.bits.dstopts)
431 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
432 break;
433 case IPPROTO_ROUTING:
434 nexthdr = ptr[0];
435 len = (ptr[1] + 1) << 3;
436 if (np->rxopt.bits.srcrt)
437 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
438 break;
439 case IPPROTO_AH:
440 nexthdr = ptr[0];
441 len = (ptr[1] + 2) << 2;
442 break;
443 default:
444 nexthdr = ptr[0];
445 len = (ptr[1] + 1) << 3;
446 break;
447 }
448
449 off += len;
450 }
451 }
452
453 /* socket options in old style */
454 if (np->rxopt.bits.rxoinfo) {
455 struct in6_pktinfo src_info;
456
457 src_info.ipi6_ifindex = opt->iif;
458 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
459 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
460 }
461 if (np->rxopt.bits.rxohlim) {
462 int hlim = skb->nh.ipv6h->hop_limit;
463 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
464 }
465 if (np->rxopt.bits.ohopopts && opt->hop) {
466 u8 *ptr = skb->nh.raw + opt->hop;
467 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
468 }
469 if (np->rxopt.bits.odstopts && opt->dst0) {
470 u8 *ptr = skb->nh.raw + opt->dst0;
471 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
472 }
473 if (np->rxopt.bits.osrcrt && opt->srcrt) {
474 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt);
475 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
476 }
477 if (np->rxopt.bits.odstopts && opt->dst1) {
478 u8 *ptr = skb->nh.raw + opt->dst1;
479 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
480 }
481 return 0;
482 }
483
484 int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
485 struct ipv6_txoptions *opt,
486 int *hlimit, int *tclass)
487 {
488 struct in6_pktinfo *src_info;
489 struct cmsghdr *cmsg;
490 struct ipv6_rt_hdr *rthdr;
491 struct ipv6_opt_hdr *hdr;
492 int len;
493 int err = 0;
494
495 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
496 int addr_type;
497 struct net_device *dev = NULL;
498
499 if (!CMSG_OK(msg, cmsg)) {
500 err = -EINVAL;
501 goto exit_f;
502 }
503
504 if (cmsg->cmsg_level != SOL_IPV6)
505 continue;
506
507 switch (cmsg->cmsg_type) {
508 case IPV6_PKTINFO:
509 case IPV6_2292PKTINFO:
510 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
511 err = -EINVAL;
512 goto exit_f;
513 }
514
515 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
516
517 if (src_info->ipi6_ifindex) {
518 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
519 return -EINVAL;
520 fl->oif = src_info->ipi6_ifindex;
521 }
522
523 addr_type = ipv6_addr_type(&src_info->ipi6_addr);
524
525 if (addr_type == IPV6_ADDR_ANY)
526 break;
527
528 if (addr_type & IPV6_ADDR_LINKLOCAL) {
529 if (!src_info->ipi6_ifindex)
530 return -EINVAL;
531 else {
532 dev = dev_get_by_index(src_info->ipi6_ifindex);
533 if (!dev)
534 return -ENODEV;
535 }
536 }
537 if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) {
538 if (dev)
539 dev_put(dev);
540 err = -EINVAL;
541 goto exit_f;
542 }
543 if (dev)
544 dev_put(dev);
545
546 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
547 break;
548
549 case IPV6_FLOWINFO:
550 if (cmsg->cmsg_len < CMSG_LEN(4)) {
551 err = -EINVAL;
552 goto exit_f;
553 }
554
555 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
556 if ((fl->fl6_flowlabel^*(u32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
557 err = -EINVAL;
558 goto exit_f;
559 }
560 }
561 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(u32 *)CMSG_DATA(cmsg);
562 break;
563
564 case IPV6_2292HOPOPTS:
565 case IPV6_HOPOPTS:
566 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
567 err = -EINVAL;
568 goto exit_f;
569 }
570
571 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
572 len = ((hdr->hdrlen + 1) << 3);
573 if (cmsg->cmsg_len < CMSG_LEN(len)) {
574 err = -EINVAL;
575 goto exit_f;
576 }
577 if (!capable(CAP_NET_RAW)) {
578 err = -EPERM;
579 goto exit_f;
580 }
581 opt->opt_nflen += len;
582 opt->hopopt = hdr;
583 break;
584
585 case IPV6_2292DSTOPTS:
586 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
587 err = -EINVAL;
588 goto exit_f;
589 }
590
591 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
592 len = ((hdr->hdrlen + 1) << 3);
593 if (cmsg->cmsg_len < CMSG_LEN(len)) {
594 err = -EINVAL;
595 goto exit_f;
596 }
597 if (!capable(CAP_NET_RAW)) {
598 err = -EPERM;
599 goto exit_f;
600 }
601 if (opt->dst1opt) {
602 err = -EINVAL;
603 goto exit_f;
604 }
605 opt->opt_flen += len;
606 opt->dst1opt = hdr;
607 break;
608
609 case IPV6_DSTOPTS:
610 case IPV6_RTHDRDSTOPTS:
611 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
612 err = -EINVAL;
613 goto exit_f;
614 }
615
616 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
617 len = ((hdr->hdrlen + 1) << 3);
618 if (cmsg->cmsg_len < CMSG_LEN(len)) {
619 err = -EINVAL;
620 goto exit_f;
621 }
622 if (!capable(CAP_NET_RAW)) {
623 err = -EPERM;
624 goto exit_f;
625 }
626 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
627 opt->opt_flen += len;
628 opt->dst1opt = hdr;
629 } else {
630 opt->opt_nflen += len;
631 opt->dst0opt = hdr;
632 }
633 break;
634
635 case IPV6_2292RTHDR:
636 case IPV6_RTHDR:
637 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
638 err = -EINVAL;
639 goto exit_f;
640 }
641
642 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
643
644 /*
645 * TYPE 0
646 */
647 if (rthdr->type) {
648 err = -EINVAL;
649 goto exit_f;
650 }
651
652 len = ((rthdr->hdrlen + 1) << 3);
653
654 if (cmsg->cmsg_len < CMSG_LEN(len)) {
655 err = -EINVAL;
656 goto exit_f;
657 }
658
659 /* segments left must also match */
660 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
661 err = -EINVAL;
662 goto exit_f;
663 }
664
665 opt->opt_nflen += len;
666 opt->srcrt = rthdr;
667
668 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
669 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
670
671 opt->opt_nflen += dsthdrlen;
672 opt->dst0opt = opt->dst1opt;
673 opt->dst1opt = NULL;
674 opt->opt_flen -= dsthdrlen;
675 }
676
677 break;
678
679 case IPV6_2292HOPLIMIT:
680 case IPV6_HOPLIMIT:
681 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
682 err = -EINVAL;
683 goto exit_f;
684 }
685
686 *hlimit = *(int *)CMSG_DATA(cmsg);
687 break;
688
689 case IPV6_TCLASS:
690 {
691 int tc;
692
693 err = -EINVAL;
694 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
695 goto exit_f;
696 }
697
698 tc = *(int *)CMSG_DATA(cmsg);
699 if (tc < 0 || tc > 0xff)
700 goto exit_f;
701
702 err = 0;
703 *tclass = tc;
704
705 break;
706 }
707 default:
708 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
709 cmsg->cmsg_type);
710 err = -EINVAL;
711 break;
712 };
713 }
714
715 exit_f:
716 return err;
717 }
linux-next