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Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux/fpc-iii.git] / net / ipv6 / datagram.c
blob7206747022fcf6407e71cedaf49be827badf0cdb
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 security_sk_classify_flow(sk, &fl);
160
161 if (flowlabel) {
162 if (flowlabel->opt && flowlabel->opt->srcrt) {
163 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
164 ipv6_addr_copy(&final, &fl.fl6_dst);
165 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
166 final_p = &final;
167 }
168 } else if (np->opt && np->opt->srcrt) {
169 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
170 ipv6_addr_copy(&final, &fl.fl6_dst);
171 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
172 final_p = &final;
173 }
174
175 err = ip6_dst_lookup(sk, &dst, &fl);
176 if (err)
177 goto out;
178 if (final_p)
179 ipv6_addr_copy(&fl.fl6_dst, final_p);
180
181 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
182 goto out;
183
184 /* source address lookup done in ip6_dst_lookup */
185
186 if (ipv6_addr_any(&np->saddr))
187 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
188
189 if (ipv6_addr_any(&np->rcv_saddr)) {
190 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
191 inet->rcv_saddr = LOOPBACK4_IPV6;
192 }
193
194 ip6_dst_store(sk, dst,
195 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
196 &np->daddr : NULL,
197 #ifdef CONFIG_IPV6_SUBTREES
198 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
199 &np->saddr :
200 #endif
201 NULL);
202
203 sk->sk_state = TCP_ESTABLISHED;
204 out:
205 fl6_sock_release(flowlabel);
206 return err;
207 }
208
209 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
210 u16 port, u32 info, u8 *payload)
211 {
212 struct ipv6_pinfo *np = inet6_sk(sk);
213 struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw;
214 struct sock_exterr_skb *serr;
215
216 if (!np->recverr)
217 return;
218
219 skb = skb_clone(skb, GFP_ATOMIC);
220 if (!skb)
221 return;
222
223 serr = SKB_EXT_ERR(skb);
224 serr->ee.ee_errno = err;
225 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
226 serr->ee.ee_type = icmph->icmp6_type;
227 serr->ee.ee_code = icmph->icmp6_code;
228 serr->ee.ee_pad = 0;
229 serr->ee.ee_info = info;
230 serr->ee.ee_data = 0;
231 serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw;
232 serr->port = port;
233
234 skb->h.raw = payload;
235 __skb_pull(skb, payload - skb->data);
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 flowi *fl, 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 iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));
256 skb->nh.ipv6h = iph;
257 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
258
259 serr = SKB_EXT_ERR(skb);
260 serr->ee.ee_errno = err;
261 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
262 serr->ee.ee_type = 0;
263 serr->ee.ee_code = 0;
264 serr->ee.ee_pad = 0;
265 serr->ee.ee_info = info;
266 serr->ee.ee_data = 0;
267 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
268 serr->port = fl->fl_ip_dport;
269
270 skb->h.raw = skb->tail;
271 __skb_pull(skb, skb->tail - skb->data);
272
273 if (sock_queue_err_skb(sk, skb))
274 kfree_skb(skb);
275 }
276
277 /*
278 * Handle MSG_ERRQUEUE
279 */
280 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
281 {
282 struct ipv6_pinfo *np = inet6_sk(sk);
283 struct sock_exterr_skb *serr;
284 struct sk_buff *skb, *skb2;
285 struct sockaddr_in6 *sin;
286 struct {
287 struct sock_extended_err ee;
288 struct sockaddr_in6 offender;
289 } errhdr;
290 int err;
291 int copied;
292
293 err = -EAGAIN;
294 skb = skb_dequeue(&sk->sk_error_queue);
295 if (skb == NULL)
296 goto out;
297
298 copied = skb->len;
299 if (copied > len) {
300 msg->msg_flags |= MSG_TRUNC;
301 copied = len;
302 }
303 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
304 if (err)
305 goto out_free_skb;
306
307 sock_recv_timestamp(msg, sk, skb);
308
309 serr = SKB_EXT_ERR(skb);
310
311 sin = (struct sockaddr_in6 *)msg->msg_name;
312 if (sin) {
313 sin->sin6_family = AF_INET6;
314 sin->sin6_flowinfo = 0;
315 sin->sin6_port = serr->port;
316 sin->sin6_scope_id = 0;
317 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
318 ipv6_addr_copy(&sin->sin6_addr,
319 (struct in6_addr *)(skb->nh.raw + serr->addr_offset));
320 if (np->sndflow)
321 sin->sin6_flowinfo = *(u32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
322 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
323 sin->sin6_scope_id = IP6CB(skb)->iif;
324 } else {
325 ipv6_addr_set(&sin->sin6_addr, 0, 0,
326 htonl(0xffff),
327 *(u32*)(skb->nh.raw + serr->addr_offset));
328 }
329 }
330
331 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
332 sin = &errhdr.offender;
333 sin->sin6_family = AF_UNSPEC;
334 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
335 sin->sin6_family = AF_INET6;
336 sin->sin6_flowinfo = 0;
337 sin->sin6_scope_id = 0;
338 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
339 ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr);
340 if (np->rxopt.all)
341 datagram_recv_ctl(sk, msg, skb);
342 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
343 sin->sin6_scope_id = IP6CB(skb)->iif;
344 } else {
345 struct inet_sock *inet = inet_sk(sk);
346
347 ipv6_addr_set(&sin->sin6_addr, 0, 0,
348 htonl(0xffff),
349 skb->nh.iph->saddr);
350 if (inet->cmsg_flags)
351 ip_cmsg_recv(msg, skb);
352 }
353 }
354
355 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
356
357 /* Now we could try to dump offended packet options */
358
359 msg->msg_flags |= MSG_ERRQUEUE;
360 err = copied;
361
362 /* Reset and regenerate socket error */
363 spin_lock_bh(&sk->sk_error_queue.lock);
364 sk->sk_err = 0;
365 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
366 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
367 spin_unlock_bh(&sk->sk_error_queue.lock);
368 sk->sk_error_report(sk);
369 } else {
370 spin_unlock_bh(&sk->sk_error_queue.lock);
371 }
372
373 out_free_skb:
374 kfree_skb(skb);
375 out:
376 return err;
377 }
378
379
380
381 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
382 {
383 struct ipv6_pinfo *np = inet6_sk(sk);
384 struct inet6_skb_parm *opt = IP6CB(skb);
385
386 if (np->rxopt.bits.rxinfo) {
387 struct in6_pktinfo src_info;
388
389 src_info.ipi6_ifindex = opt->iif;
390 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
391 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
392 }
393
394 if (np->rxopt.bits.rxhlim) {
395 int hlim = skb->nh.ipv6h->hop_limit;
396 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
397 }
398
399 if (np->rxopt.bits.rxtclass) {
400 int tclass = (ntohl(*(u32 *)skb->nh.ipv6h) >> 20) & 0xff;
401 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
402 }
403
404 if (np->rxopt.bits.rxflow && (*(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
405 u32 flowinfo = *(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK;
406 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
407 }
408
409 /* HbH is allowed only once */
410 if (np->rxopt.bits.hopopts && opt->hop) {
411 u8 *ptr = skb->nh.raw + opt->hop;
412 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
413 }
414
415 if (opt->lastopt &&
416 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
417 /*
418 * Silly enough, but we need to reparse in order to
419 * report extension headers (except for HbH)
420 * in order.
421 *
422 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
423 * (and WILL NOT be) defined because
424 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
425 */
426 unsigned int off = sizeof(struct ipv6hdr);
427 u8 nexthdr = skb->nh.ipv6h->nexthdr;
428
429 while (off <= opt->lastopt) {
430 unsigned len;
431 u8 *ptr = skb->nh.raw + off;
432
433 switch(nexthdr) {
434 case IPPROTO_DSTOPTS:
435 nexthdr = ptr[0];
436 len = (ptr[1] + 1) << 3;
437 if (np->rxopt.bits.dstopts)
438 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
439 break;
440 case IPPROTO_ROUTING:
441 nexthdr = ptr[0];
442 len = (ptr[1] + 1) << 3;
443 if (np->rxopt.bits.srcrt)
444 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
445 break;
446 case IPPROTO_AH:
447 nexthdr = ptr[0];
448 len = (ptr[1] + 2) << 2;
449 break;
450 default:
451 nexthdr = ptr[0];
452 len = (ptr[1] + 1) << 3;
453 break;
454 }
455
456 off += len;
457 }
458 }
459
460 /* socket options in old style */
461 if (np->rxopt.bits.rxoinfo) {
462 struct in6_pktinfo src_info;
463
464 src_info.ipi6_ifindex = opt->iif;
465 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
466 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
467 }
468 if (np->rxopt.bits.rxohlim) {
469 int hlim = skb->nh.ipv6h->hop_limit;
470 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
471 }
472 if (np->rxopt.bits.ohopopts && opt->hop) {
473 u8 *ptr = skb->nh.raw + opt->hop;
474 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
475 }
476 if (np->rxopt.bits.odstopts && opt->dst0) {
477 u8 *ptr = skb->nh.raw + opt->dst0;
478 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
479 }
480 if (np->rxopt.bits.osrcrt && opt->srcrt) {
481 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt);
482 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
483 }
484 if (np->rxopt.bits.odstopts && opt->dst1) {
485 u8 *ptr = skb->nh.raw + opt->dst1;
486 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
487 }
488 return 0;
489 }
490
491 int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
492 struct ipv6_txoptions *opt,
493 int *hlimit, int *tclass)
494 {
495 struct in6_pktinfo *src_info;
496 struct cmsghdr *cmsg;
497 struct ipv6_rt_hdr *rthdr;
498 struct ipv6_opt_hdr *hdr;
499 int len;
500 int err = 0;
501
502 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
503 int addr_type;
504 struct net_device *dev = NULL;
505
506 if (!CMSG_OK(msg, cmsg)) {
507 err = -EINVAL;
508 goto exit_f;
509 }
510
511 if (cmsg->cmsg_level != SOL_IPV6)
512 continue;
513
514 switch (cmsg->cmsg_type) {
515 case IPV6_PKTINFO:
516 case IPV6_2292PKTINFO:
517 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
518 err = -EINVAL;
519 goto exit_f;
520 }
521
522 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
523
524 if (src_info->ipi6_ifindex) {
525 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
526 return -EINVAL;
527 fl->oif = src_info->ipi6_ifindex;
528 }
529
530 addr_type = ipv6_addr_type(&src_info->ipi6_addr);
531
532 if (addr_type == IPV6_ADDR_ANY)
533 break;
534
535 if (addr_type & IPV6_ADDR_LINKLOCAL) {
536 if (!src_info->ipi6_ifindex)
537 return -EINVAL;
538 else {
539 dev = dev_get_by_index(src_info->ipi6_ifindex);
540 if (!dev)
541 return -ENODEV;
542 }
543 }
544 if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) {
545 if (dev)
546 dev_put(dev);
547 err = -EINVAL;
548 goto exit_f;
549 }
550 if (dev)
551 dev_put(dev);
552
553 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
554 break;
555
556 case IPV6_FLOWINFO:
557 if (cmsg->cmsg_len < CMSG_LEN(4)) {
558 err = -EINVAL;
559 goto exit_f;
560 }
561
562 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
563 if ((fl->fl6_flowlabel^*(u32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
564 err = -EINVAL;
565 goto exit_f;
566 }
567 }
568 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(u32 *)CMSG_DATA(cmsg);
569 break;
570
571 case IPV6_2292HOPOPTS:
572 case IPV6_HOPOPTS:
573 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
574 err = -EINVAL;
575 goto exit_f;
576 }
577
578 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
579 len = ((hdr->hdrlen + 1) << 3);
580 if (cmsg->cmsg_len < CMSG_LEN(len)) {
581 err = -EINVAL;
582 goto exit_f;
583 }
584 if (!capable(CAP_NET_RAW)) {
585 err = -EPERM;
586 goto exit_f;
587 }
588 opt->opt_nflen += len;
589 opt->hopopt = hdr;
590 break;
591
592 case IPV6_2292DSTOPTS:
593 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
594 err = -EINVAL;
595 goto exit_f;
596 }
597
598 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
599 len = ((hdr->hdrlen + 1) << 3);
600 if (cmsg->cmsg_len < CMSG_LEN(len)) {
601 err = -EINVAL;
602 goto exit_f;
603 }
604 if (!capable(CAP_NET_RAW)) {
605 err = -EPERM;
606 goto exit_f;
607 }
608 if (opt->dst1opt) {
609 err = -EINVAL;
610 goto exit_f;
611 }
612 opt->opt_flen += len;
613 opt->dst1opt = hdr;
614 break;
615
616 case IPV6_DSTOPTS:
617 case IPV6_RTHDRDSTOPTS:
618 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
619 err = -EINVAL;
620 goto exit_f;
621 }
622
623 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
624 len = ((hdr->hdrlen + 1) << 3);
625 if (cmsg->cmsg_len < CMSG_LEN(len)) {
626 err = -EINVAL;
627 goto exit_f;
628 }
629 if (!capable(CAP_NET_RAW)) {
630 err = -EPERM;
631 goto exit_f;
632 }
633 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
634 opt->opt_flen += len;
635 opt->dst1opt = hdr;
636 } else {
637 opt->opt_nflen += len;
638 opt->dst0opt = hdr;
639 }
640 break;
641
642 case IPV6_2292RTHDR:
643 case IPV6_RTHDR:
644 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
645 err = -EINVAL;
646 goto exit_f;
647 }
648
649 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
650
651 switch (rthdr->type) {
652 case IPV6_SRCRT_TYPE_0:
653 #ifdef CONFIG_IPV6_MIP6
654 case IPV6_SRCRT_TYPE_2:
655 #endif
656 break;
657 default:
658 err = -EINVAL;
659 goto exit_f;
660 }
661
662 len = ((rthdr->hdrlen + 1) << 3);
663
664 if (cmsg->cmsg_len < CMSG_LEN(len)) {
665 err = -EINVAL;
666 goto exit_f;
667 }
668
669 /* segments left must also match */
670 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
671 err = -EINVAL;
672 goto exit_f;
673 }
674
675 opt->opt_nflen += len;
676 opt->srcrt = rthdr;
677
678 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
679 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
680
681 opt->opt_nflen += dsthdrlen;
682 opt->dst0opt = opt->dst1opt;
683 opt->dst1opt = NULL;
684 opt->opt_flen -= dsthdrlen;
685 }
686
687 break;
688
689 case IPV6_2292HOPLIMIT:
690 case IPV6_HOPLIMIT:
691 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
692 err = -EINVAL;
693 goto exit_f;
694 }
695
696 *hlimit = *(int *)CMSG_DATA(cmsg);
697 break;
698
699 case IPV6_TCLASS:
700 {
701 int tc;
702
703 err = -EINVAL;
704 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
705 goto exit_f;
706 }
707
708 tc = *(int *)CMSG_DATA(cmsg);
709 if (tc < -1 || tc > 0xff)
710 goto exit_f;
711
712 err = 0;
713 *tclass = tc;
714
715 break;
716 }
717 default:
718 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
719 cmsg->cmsg_type);
720 err = -EINVAL;
721 break;
722 };
723 }
724
725 exit_f:
726 return err;
727 }
Linux with added FPC-III support