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Linux 2.6.21.1
[linux/fpc-iii.git] / net / ipv6 / datagram.c
blob3b4e8dcf4c86f7992ab69ee64909f79ce30e813b
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/interrupt.h>
21 #include <linux/socket.h>
22 #include <linux/sockios.h>
23 #include <linux/in6.h>
24 #include <linux/ipv6.h>
25 #include <linux/route.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
34 #include <linux/errqueue.h>
35 #include <asm/uaccess.h>
36
37 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
38 {
39 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
40 struct inet_sock *inet = inet_sk(sk);
41 struct ipv6_pinfo *np = inet6_sk(sk);
42 struct in6_addr *daddr, *final_p = NULL, final;
43 struct dst_entry *dst;
44 struct flowi fl;
45 struct ip6_flowlabel *flowlabel = NULL;
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(&fl, 0, sizeof(fl));
63 if (np->sndflow) {
64 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
65 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
66 flowlabel = fl6_sock_lookup(sk, fl.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(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr);
104
105 if (ipv6_addr_any(&np->saddr)) {
106 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff),
107 inet->saddr);
108 }
109
110 if (ipv6_addr_any(&np->rcv_saddr)) {
111 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff),
112 inet->rcv_saddr);
113 }
114 goto out;
115 }
116
117 if (addr_type&IPV6_ADDR_LINKLOCAL) {
118 if (addr_len >= sizeof(struct sockaddr_in6) &&
119 usin->sin6_scope_id) {
120 if (sk->sk_bound_dev_if &&
121 sk->sk_bound_dev_if != usin->sin6_scope_id) {
122 err = -EINVAL;
123 goto out;
124 }
125 sk->sk_bound_dev_if = usin->sin6_scope_id;
126 if (!sk->sk_bound_dev_if &&
127 (addr_type & IPV6_ADDR_MULTICAST))
128 fl.oif = np->mcast_oif;
129 }
130
131 /* Connect to link-local address requires an interface */
132 if (!sk->sk_bound_dev_if) {
133 err = -EINVAL;
134 goto out;
135 }
136 }
137
138 ipv6_addr_copy(&np->daddr, daddr);
139 np->flow_label = fl.fl6_flowlabel;
140
141 inet->dport = usin->sin6_port;
142
143 /*
144 * Check for a route to destination an obtain the
145 * destination cache for it.
146 */
147
148 fl.proto = sk->sk_protocol;
149 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
150 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
151 fl.oif = sk->sk_bound_dev_if;
152 fl.fl_ip_dport = inet->dport;
153 fl.fl_ip_sport = inet->sport;
154
155 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
156 fl.oif = np->mcast_oif;
157
158 security_sk_classify_flow(sk, &fl);
159
160 if (flowlabel) {
161 if (flowlabel->opt && flowlabel->opt->srcrt) {
162 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
163 ipv6_addr_copy(&final, &fl.fl6_dst);
164 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
165 final_p = &final;
166 }
167 } else if (np->opt && np->opt->srcrt) {
168 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
169 ipv6_addr_copy(&final, &fl.fl6_dst);
170 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
171 final_p = &final;
172 }
173
174 err = ip6_dst_lookup(sk, &dst, &fl);
175 if (err)
176 goto out;
177 if (final_p)
178 ipv6_addr_copy(&fl.fl6_dst, final_p);
179
180 if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
181 goto out;
182
183 /* source address lookup done in ip6_dst_lookup */
184
185 if (ipv6_addr_any(&np->saddr))
186 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
187
188 if (ipv6_addr_any(&np->rcv_saddr)) {
189 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
190 inet->rcv_saddr = LOOPBACK4_IPV6;
191 }
192
193 ip6_dst_store(sk, dst,
194 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
195 &np->daddr : NULL,
196 #ifdef CONFIG_IPV6_SUBTREES
197 ipv6_addr_equal(&fl.fl6_src, &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
208 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
209 __be16 port, u32 info, u8 *payload)
210 {
211 struct ipv6_pinfo *np = inet6_sk(sk);
212 struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw;
213 struct sock_exterr_skb *serr;
214
215 if (!np->recverr)
216 return;
217
218 skb = skb_clone(skb, GFP_ATOMIC);
219 if (!skb)
220 return;
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) - skb->nh.raw;
231 serr->port = port;
232
233 skb->h.raw = payload;
234 __skb_pull(skb, payload - skb->data);
235
236 if (sock_queue_err_skb(sk, skb))
237 kfree_skb(skb);
238 }
239
240 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
241 {
242 struct ipv6_pinfo *np = inet6_sk(sk);
243 struct sock_exterr_skb *serr;
244 struct ipv6hdr *iph;
245 struct sk_buff *skb;
246
247 if (!np->recverr)
248 return;
249
250 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
251 if (!skb)
252 return;
253
254 iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));
255 skb->nh.ipv6h = iph;
256 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
257
258 serr = SKB_EXT_ERR(skb);
259 serr->ee.ee_errno = err;
260 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
261 serr->ee.ee_type = 0;
262 serr->ee.ee_code = 0;
263 serr->ee.ee_pad = 0;
264 serr->ee.ee_info = info;
265 serr->ee.ee_data = 0;
266 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
267 serr->port = fl->fl_ip_dport;
268
269 skb->h.raw = skb->tail;
270 __skb_pull(skb, skb->tail - skb->data);
271
272 if (sock_queue_err_skb(sk, skb))
273 kfree_skb(skb);
274 }
275
276 /*
277 * Handle MSG_ERRQUEUE
278 */
279 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
280 {
281 struct ipv6_pinfo *np = inet6_sk(sk);
282 struct sock_exterr_skb *serr;
283 struct sk_buff *skb, *skb2;
284 struct sockaddr_in6 *sin;
285 struct {
286 struct sock_extended_err ee;
287 struct sockaddr_in6 offender;
288 } errhdr;
289 int err;
290 int copied;
291
292 err = -EAGAIN;
293 skb = skb_dequeue(&sk->sk_error_queue);
294 if (skb == NULL)
295 goto out;
296
297 copied = skb->len;
298 if (copied > len) {
299 msg->msg_flags |= MSG_TRUNC;
300 copied = len;
301 }
302 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
303 if (err)
304 goto out_free_skb;
305
306 sock_recv_timestamp(msg, sk, skb);
307
308 serr = SKB_EXT_ERR(skb);
309
310 sin = (struct sockaddr_in6 *)msg->msg_name;
311 if (sin) {
312 sin->sin6_family = AF_INET6;
313 sin->sin6_flowinfo = 0;
314 sin->sin6_port = serr->port;
315 sin->sin6_scope_id = 0;
316 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
317 ipv6_addr_copy(&sin->sin6_addr,
318 (struct in6_addr *)(skb->nh.raw + serr->addr_offset));
319 if (np->sndflow)
320 sin->sin6_flowinfo = *(__be32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
321 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
322 sin->sin6_scope_id = IP6CB(skb)->iif;
323 } else {
324 ipv6_addr_set(&sin->sin6_addr, 0, 0,
325 htonl(0xffff),
326 *(__be32*)(skb->nh.raw + serr->addr_offset));
327 }
328 }
329
330 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
331 sin = &errhdr.offender;
332 sin->sin6_family = AF_UNSPEC;
333 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
334 sin->sin6_family = AF_INET6;
335 sin->sin6_flowinfo = 0;
336 sin->sin6_scope_id = 0;
337 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
338 ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr);
339 if (np->rxopt.all)
340 datagram_recv_ctl(sk, msg, skb);
341 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
342 sin->sin6_scope_id = IP6CB(skb)->iif;
343 } else {
344 struct inet_sock *inet = inet_sk(sk);
345
346 ipv6_addr_set(&sin->sin6_addr, 0, 0,
347 htonl(0xffff),
348 skb->nh.iph->saddr);
349 if (inet->cmsg_flags)
350 ip_cmsg_recv(msg, skb);
351 }
352 }
353
354 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
355
356 /* Now we could try to dump offended packet options */
357
358 msg->msg_flags |= MSG_ERRQUEUE;
359 err = copied;
360
361 /* Reset and regenerate socket error */
362 spin_lock_bh(&sk->sk_error_queue.lock);
363 sk->sk_err = 0;
364 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
365 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
366 spin_unlock_bh(&sk->sk_error_queue.lock);
367 sk->sk_error_report(sk);
368 } else {
369 spin_unlock_bh(&sk->sk_error_queue.lock);
370 }
371
372 out_free_skb:
373 kfree_skb(skb);
374 out:
375 return err;
376 }
377
378
379
380 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
381 {
382 struct ipv6_pinfo *np = inet6_sk(sk);
383 struct inet6_skb_parm *opt = IP6CB(skb);
384
385 if (np->rxopt.bits.rxinfo) {
386 struct in6_pktinfo src_info;
387
388 src_info.ipi6_ifindex = opt->iif;
389 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
390 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
391 }
392
393 if (np->rxopt.bits.rxhlim) {
394 int hlim = skb->nh.ipv6h->hop_limit;
395 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
396 }
397
398 if (np->rxopt.bits.rxtclass) {
399 int tclass = (ntohl(*(__be32 *)skb->nh.ipv6h) >> 20) & 0xff;
400 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
401 }
402
403 if (np->rxopt.bits.rxflow && (*(__be32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
404 __be32 flowinfo = *(__be32*)skb->nh.raw & IPV6_FLOWINFO_MASK;
405 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
406 }
407
408 /* HbH is allowed only once */
409 if (np->rxopt.bits.hopopts && opt->hop) {
410 u8 *ptr = skb->nh.raw + opt->hop;
411 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
412 }
413
414 if (opt->lastopt &&
415 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
416 /*
417 * Silly enough, but we need to reparse in order to
418 * report extension headers (except for HbH)
419 * in order.
420 *
421 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
422 * (and WILL NOT be) defined because
423 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
424 */
425 unsigned int off = sizeof(struct ipv6hdr);
426 u8 nexthdr = skb->nh.ipv6h->nexthdr;
427
428 while (off <= opt->lastopt) {
429 unsigned len;
430 u8 *ptr = skb->nh.raw + off;
431
432 switch(nexthdr) {
433 case IPPROTO_DSTOPTS:
434 nexthdr = ptr[0];
435 len = (ptr[1] + 1) << 3;
436 if (np->rxopt.bits.dstopts)
437 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
438 break;
439 case IPPROTO_ROUTING:
440 nexthdr = ptr[0];
441 len = (ptr[1] + 1) << 3;
442 if (np->rxopt.bits.srcrt)
443 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
444 break;
445 case IPPROTO_AH:
446 nexthdr = ptr[0];
447 len = (ptr[1] + 2) << 2;
448 break;
449 default:
450 nexthdr = ptr[0];
451 len = (ptr[1] + 1) << 3;
452 break;
453 }
454
455 off += len;
456 }
457 }
458
459 /* socket options in old style */
460 if (np->rxopt.bits.rxoinfo) {
461 struct in6_pktinfo src_info;
462
463 src_info.ipi6_ifindex = opt->iif;
464 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
465 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
466 }
467 if (np->rxopt.bits.rxohlim) {
468 int hlim = skb->nh.ipv6h->hop_limit;
469 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
470 }
471 if (np->rxopt.bits.ohopopts && opt->hop) {
472 u8 *ptr = skb->nh.raw + opt->hop;
473 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
474 }
475 if (np->rxopt.bits.odstopts && opt->dst0) {
476 u8 *ptr = skb->nh.raw + opt->dst0;
477 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
478 }
479 if (np->rxopt.bits.osrcrt && opt->srcrt) {
480 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt);
481 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
482 }
483 if (np->rxopt.bits.odstopts && opt->dst1) {
484 u8 *ptr = skb->nh.raw + opt->dst1;
485 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
486 }
487 return 0;
488 }
489
490 int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
491 struct ipv6_txoptions *opt,
492 int *hlimit, int *tclass)
493 {
494 struct in6_pktinfo *src_info;
495 struct cmsghdr *cmsg;
496 struct ipv6_rt_hdr *rthdr;
497 struct ipv6_opt_hdr *hdr;
498 int len;
499 int err = 0;
500
501 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
502 int addr_type;
503 struct net_device *dev = NULL;
504
505 if (!CMSG_OK(msg, cmsg)) {
506 err = -EINVAL;
507 goto exit_f;
508 }
509
510 if (cmsg->cmsg_level != SOL_IPV6)
511 continue;
512
513 switch (cmsg->cmsg_type) {
514 case IPV6_PKTINFO:
515 case IPV6_2292PKTINFO:
516 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
517 err = -EINVAL;
518 goto exit_f;
519 }
520
521 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
522
523 if (src_info->ipi6_ifindex) {
524 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
525 return -EINVAL;
526 fl->oif = src_info->ipi6_ifindex;
527 }
528
529 addr_type = ipv6_addr_type(&src_info->ipi6_addr);
530
531 if (addr_type == IPV6_ADDR_ANY)
532 break;
533
534 if (addr_type & IPV6_ADDR_LINKLOCAL) {
535 if (!src_info->ipi6_ifindex)
536 return -EINVAL;
537 else {
538 dev = dev_get_by_index(src_info->ipi6_ifindex);
539 if (!dev)
540 return -ENODEV;
541 }
542 }
543 if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) {
544 if (dev)
545 dev_put(dev);
546 err = -EINVAL;
547 goto exit_f;
548 }
549 if (dev)
550 dev_put(dev);
551
552 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
553 break;
554
555 case IPV6_FLOWINFO:
556 if (cmsg->cmsg_len < CMSG_LEN(4)) {
557 err = -EINVAL;
558 goto exit_f;
559 }
560
561 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
562 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
563 err = -EINVAL;
564 goto exit_f;
565 }
566 }
567 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
568 break;
569
570 case IPV6_2292HOPOPTS:
571 case IPV6_HOPOPTS:
572 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
573 err = -EINVAL;
574 goto exit_f;
575 }
576
577 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
578 len = ((hdr->hdrlen + 1) << 3);
579 if (cmsg->cmsg_len < CMSG_LEN(len)) {
580 err = -EINVAL;
581 goto exit_f;
582 }
583 if (!capable(CAP_NET_RAW)) {
584 err = -EPERM;
585 goto exit_f;
586 }
587 opt->opt_nflen += len;
588 opt->hopopt = hdr;
589 break;
590
591 case IPV6_2292DSTOPTS:
592 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
593 err = -EINVAL;
594 goto exit_f;
595 }
596
597 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
598 len = ((hdr->hdrlen + 1) << 3);
599 if (cmsg->cmsg_len < CMSG_LEN(len)) {
600 err = -EINVAL;
601 goto exit_f;
602 }
603 if (!capable(CAP_NET_RAW)) {
604 err = -EPERM;
605 goto exit_f;
606 }
607 if (opt->dst1opt) {
608 err = -EINVAL;
609 goto exit_f;
610 }
611 opt->opt_flen += len;
612 opt->dst1opt = hdr;
613 break;
614
615 case IPV6_DSTOPTS:
616 case IPV6_RTHDRDSTOPTS:
617 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
618 err = -EINVAL;
619 goto exit_f;
620 }
621
622 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
623 len = ((hdr->hdrlen + 1) << 3);
624 if (cmsg->cmsg_len < CMSG_LEN(len)) {
625 err = -EINVAL;
626 goto exit_f;
627 }
628 if (!capable(CAP_NET_RAW)) {
629 err = -EPERM;
630 goto exit_f;
631 }
632 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
633 opt->opt_flen += len;
634 opt->dst1opt = hdr;
635 } else {
636 opt->opt_nflen += len;
637 opt->dst0opt = hdr;
638 }
639 break;
640
641 case IPV6_2292RTHDR:
642 case IPV6_RTHDR:
643 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
644 err = -EINVAL;
645 goto exit_f;
646 }
647
648 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
649
650 switch (rthdr->type) {
651 case IPV6_SRCRT_TYPE_0:
652 #ifdef CONFIG_IPV6_MIP6
653 case IPV6_SRCRT_TYPE_2:
654 #endif
655 break;
656 default:
657 err = -EINVAL;
658 goto exit_f;
659 }
660
661 len = ((rthdr->hdrlen + 1) << 3);
662
663 if (cmsg->cmsg_len < CMSG_LEN(len)) {
664 err = -EINVAL;
665 goto exit_f;
666 }
667
668 /* segments left must also match */
669 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
670 err = -EINVAL;
671 goto exit_f;
672 }
673
674 opt->opt_nflen += len;
675 opt->srcrt = rthdr;
676
677 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
678 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
679
680 opt->opt_nflen += dsthdrlen;
681 opt->dst0opt = opt->dst1opt;
682 opt->dst1opt = NULL;
683 opt->opt_flen -= dsthdrlen;
684 }
685
686 break;
687
688 case IPV6_2292HOPLIMIT:
689 case IPV6_HOPLIMIT:
690 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
691 err = -EINVAL;
692 goto exit_f;
693 }
694
695 *hlimit = *(int *)CMSG_DATA(cmsg);
696 break;
697
698 case IPV6_TCLASS:
699 {
700 int tc;
701
702 err = -EINVAL;
703 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
704 goto exit_f;
705 }
706
707 tc = *(int *)CMSG_DATA(cmsg);
708 if (tc < -1 || tc > 0xff)
709 goto exit_f;
710
711 err = 0;
712 *tclass = tc;
713
714 break;
715 }
716 default:
717 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
718 cmsg->cmsg_type);
719 err = -EINVAL;
720 break;
721 };
722 }
723
724 exit_f:
725 return err;
726 }
Linux with added FPC-III support