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Merge branch 'master' of git://git2.kernel.org/pub/scm/linux/kernel/git/torvalds...
[linux-2.6/linux-2.6-openrd.git] / net / ipv6 / datagram.c
blobe6f9cdf780fe4083dca668d25b495ab80fc34d66
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
25 #include <net/ipv6.h>
26 #include <net/ndisc.h>
27 #include <net/addrconf.h>
28 #include <net/transp_v6.h>
29 #include <net/ip6_route.h>
30 #include <net/tcp_states.h>
31
32 #include <linux/errqueue.h>
33 #include <asm/uaccess.h>
34
35 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
36 {
37 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
38 struct inet_sock *inet = inet_sk(sk);
39 struct ipv6_pinfo *np = inet6_sk(sk);
40 struct in6_addr *daddr, *final_p = NULL, final;
41 struct dst_entry *dst;
42 struct flowi fl;
43 struct ip6_flowlabel *flowlabel = NULL;
44 int addr_type;
45 int err;
46
47 if (usin->sin6_family == AF_INET) {
48 if (__ipv6_only_sock(sk))
49 return -EAFNOSUPPORT;
50 err = ip4_datagram_connect(sk, uaddr, addr_len);
51 goto ipv4_connected;
52 }
53
54 if (addr_len < SIN6_LEN_RFC2133)
55 return -EINVAL;
56
57 if (usin->sin6_family != AF_INET6)
58 return -EAFNOSUPPORT;
59
60 memset(&fl, 0, sizeof(fl));
61 if (np->sndflow) {
62 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
63 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
64 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
65 if (flowlabel == NULL)
66 return -EINVAL;
67 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
68 }
69 }
70
71 addr_type = ipv6_addr_type(&usin->sin6_addr);
72
73 if (addr_type == IPV6_ADDR_ANY) {
74 /*
75 * connect to self
76 */
77 usin->sin6_addr.s6_addr[15] = 0x01;
78 }
79
80 daddr = &usin->sin6_addr;
81
82 if (addr_type == IPV6_ADDR_MAPPED) {
83 struct sockaddr_in sin;
84
85 if (__ipv6_only_sock(sk)) {
86 err = -ENETUNREACH;
87 goto out;
88 }
89 sin.sin_family = AF_INET;
90 sin.sin_addr.s_addr = daddr->s6_addr32[3];
91 sin.sin_port = usin->sin6_port;
92
93 err = ip4_datagram_connect(sk,
94 (struct sockaddr*) &sin,
95 sizeof(sin));
96
97 ipv4_connected:
98 if (err)
99 goto out;
100
101 ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr);
102
103 if (ipv6_addr_any(&np->saddr))
104 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
105
106 if (ipv6_addr_any(&np->rcv_saddr))
107 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
108 &np->rcv_saddr);
109
110 goto out;
111 }
112
113 if (addr_type&IPV6_ADDR_LINKLOCAL) {
114 if (addr_len >= sizeof(struct sockaddr_in6) &&
115 usin->sin6_scope_id) {
116 if (sk->sk_bound_dev_if &&
117 sk->sk_bound_dev_if != usin->sin6_scope_id) {
118 err = -EINVAL;
119 goto out;
120 }
121 sk->sk_bound_dev_if = usin->sin6_scope_id;
122 }
123
124 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
125 sk->sk_bound_dev_if = np->mcast_oif;
126
127 /* Connect to link-local address requires an interface */
128 if (!sk->sk_bound_dev_if) {
129 err = -EINVAL;
130 goto out;
131 }
132 }
133
134 ipv6_addr_copy(&np->daddr, daddr);
135 np->flow_label = fl.fl6_flowlabel;
136
137 inet->inet_dport = usin->sin6_port;
138
139 /*
140 * Check for a route to destination an obtain the
141 * destination cache for it.
142 */
143
144 fl.proto = sk->sk_protocol;
145 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
146 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
147 fl.oif = sk->sk_bound_dev_if;
148 fl.mark = sk->sk_mark;
149 fl.fl_ip_dport = inet->inet_dport;
150 fl.fl_ip_sport = inet->inet_sport;
151
152 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
153 fl.oif = np->mcast_oif;
154
155 security_sk_classify_flow(sk, &fl);
156
157 if (flowlabel) {
158 if (flowlabel->opt && flowlabel->opt->srcrt) {
159 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
160 ipv6_addr_copy(&final, &fl.fl6_dst);
161 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
162 final_p = &final;
163 }
164 } else if (np->opt && np->opt->srcrt) {
165 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
166 ipv6_addr_copy(&final, &fl.fl6_dst);
167 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
168 final_p = &final;
169 }
170
171 err = ip6_dst_lookup(sk, &dst, &fl);
172 if (err)
173 goto out;
174 if (final_p)
175 ipv6_addr_copy(&fl.fl6_dst, final_p);
176
177 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
178 if (err < 0) {
179 if (err == -EREMOTE)
180 err = ip6_dst_blackhole(sk, &dst, &fl);
181 if (err < 0)
182 goto out;
183 }
184
185 /* source address lookup done in ip6_dst_lookup */
186
187 if (ipv6_addr_any(&np->saddr))
188 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
189
190 if (ipv6_addr_any(&np->rcv_saddr)) {
191 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
192 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
193 }
194
195 ip6_dst_store(sk, dst,
196 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
197 &np->daddr : NULL,
198 #ifdef CONFIG_IPV6_SUBTREES
199 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
200 &np->saddr :
201 #endif
202 NULL);
203
204 sk->sk_state = TCP_ESTABLISHED;
205 out:
206 fl6_sock_release(flowlabel);
207 return err;
208 }
209
210 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
211 __be16 port, u32 info, u8 *payload)
212 {
213 struct ipv6_pinfo *np = inet6_sk(sk);
214 struct icmp6hdr *icmph = icmp6_hdr(skb);
215 struct sock_exterr_skb *serr;
216
217 if (!np->recverr)
218 return;
219
220 skb = skb_clone(skb, GFP_ATOMIC);
221 if (!skb)
222 return;
223
224 serr = SKB_EXT_ERR(skb);
225 serr->ee.ee_errno = err;
226 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
227 serr->ee.ee_type = icmph->icmp6_type;
228 serr->ee.ee_code = icmph->icmp6_code;
229 serr->ee.ee_pad = 0;
230 serr->ee.ee_info = info;
231 serr->ee.ee_data = 0;
232 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
233 skb_network_header(skb);
234 serr->port = port;
235
236 __skb_pull(skb, payload - skb->data);
237 skb_reset_transport_header(skb);
238
239 if (sock_queue_err_skb(sk, skb))
240 kfree_skb(skb);
241 }
242
243 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
244 {
245 struct ipv6_pinfo *np = inet6_sk(sk);
246 struct sock_exterr_skb *serr;
247 struct ipv6hdr *iph;
248 struct sk_buff *skb;
249
250 if (!np->recverr)
251 return;
252
253 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
254 if (!skb)
255 return;
256
257 skb_put(skb, sizeof(struct ipv6hdr));
258 skb_reset_network_header(skb);
259 iph = ipv6_hdr(skb);
260 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
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 = fl->fl_ip_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 /*
281 * Handle MSG_ERRQUEUE
282 */
283 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
284 {
285 struct ipv6_pinfo *np = inet6_sk(sk);
286 struct sock_exterr_skb *serr;
287 struct sk_buff *skb, *skb2;
288 struct sockaddr_in6 *sin;
289 struct {
290 struct sock_extended_err ee;
291 struct sockaddr_in6 offender;
292 } errhdr;
293 int err;
294 int copied;
295
296 err = -EAGAIN;
297 skb = skb_dequeue(&sk->sk_error_queue);
298 if (skb == NULL)
299 goto out;
300
301 copied = skb->len;
302 if (copied > len) {
303 msg->msg_flags |= MSG_TRUNC;
304 copied = len;
305 }
306 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
307 if (err)
308 goto out_free_skb;
309
310 sock_recv_timestamp(msg, sk, skb);
311
312 serr = SKB_EXT_ERR(skb);
313
314 sin = (struct sockaddr_in6 *)msg->msg_name;
315 if (sin) {
316 const unsigned char *nh = skb_network_header(skb);
317 sin->sin6_family = AF_INET6;
318 sin->sin6_flowinfo = 0;
319 sin->sin6_port = serr->port;
320 sin->sin6_scope_id = 0;
321 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
322 ipv6_addr_copy(&sin->sin6_addr,
323 (struct in6_addr *)(nh + serr->addr_offset));
324 if (np->sndflow)
325 sin->sin6_flowinfo =
326 (*(__be32 *)(nh + serr->addr_offset - 24) &
327 IPV6_FLOWINFO_MASK);
328 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
329 sin->sin6_scope_id = IP6CB(skb)->iif;
330 } else {
331 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
332 &sin->sin6_addr);
333 }
334 }
335
336 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
337 sin = &errhdr.offender;
338 sin->sin6_family = AF_UNSPEC;
339 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
340 sin->sin6_family = AF_INET6;
341 sin->sin6_flowinfo = 0;
342 sin->sin6_scope_id = 0;
343 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
344 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
345 if (np->rxopt.all)
346 datagram_recv_ctl(sk, msg, skb);
347 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
348 sin->sin6_scope_id = IP6CB(skb)->iif;
349 } else {
350 struct inet_sock *inet = inet_sk(sk);
351
352 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
353 &sin->sin6_addr);
354 if (inet->cmsg_flags)
355 ip_cmsg_recv(msg, skb);
356 }
357 }
358
359 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
360
361 /* Now we could try to dump offended packet options */
362
363 msg->msg_flags |= MSG_ERRQUEUE;
364 err = copied;
365
366 /* Reset and regenerate socket error */
367 spin_lock_bh(&sk->sk_error_queue.lock);
368 sk->sk_err = 0;
369 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
370 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
371 spin_unlock_bh(&sk->sk_error_queue.lock);
372 sk->sk_error_report(sk);
373 } else {
374 spin_unlock_bh(&sk->sk_error_queue.lock);
375 }
376
377 out_free_skb:
378 kfree_skb(skb);
379 out:
380 return err;
381 }
382
383
384
385 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
386 {
387 struct ipv6_pinfo *np = inet6_sk(sk);
388 struct inet6_skb_parm *opt = IP6CB(skb);
389 unsigned char *nh = skb_network_header(skb);
390
391 if (np->rxopt.bits.rxinfo) {
392 struct in6_pktinfo src_info;
393
394 src_info.ipi6_ifindex = opt->iif;
395 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
396 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
397 }
398
399 if (np->rxopt.bits.rxhlim) {
400 int hlim = ipv6_hdr(skb)->hop_limit;
401 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
402 }
403
404 if (np->rxopt.bits.rxtclass) {
405 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
406 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
407 }
408
409 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
410 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
411 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
412 }
413
414 /* HbH is allowed only once */
415 if (np->rxopt.bits.hopopts && opt->hop) {
416 u8 *ptr = nh + opt->hop;
417 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
418 }
419
420 if (opt->lastopt &&
421 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
422 /*
423 * Silly enough, but we need to reparse in order to
424 * report extension headers (except for HbH)
425 * in order.
426 *
427 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
428 * (and WILL NOT be) defined because
429 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
430 */
431 unsigned int off = sizeof(struct ipv6hdr);
432 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
433
434 while (off <= opt->lastopt) {
435 unsigned len;
436 u8 *ptr = nh + off;
437
438 switch(nexthdr) {
439 case IPPROTO_DSTOPTS:
440 nexthdr = ptr[0];
441 len = (ptr[1] + 1) << 3;
442 if (np->rxopt.bits.dstopts)
443 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
444 break;
445 case IPPROTO_ROUTING:
446 nexthdr = ptr[0];
447 len = (ptr[1] + 1) << 3;
448 if (np->rxopt.bits.srcrt)
449 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
450 break;
451 case IPPROTO_AH:
452 nexthdr = ptr[0];
453 len = (ptr[1] + 2) << 2;
454 break;
455 default:
456 nexthdr = ptr[0];
457 len = (ptr[1] + 1) << 3;
458 break;
459 }
460
461 off += len;
462 }
463 }
464
465 /* socket options in old style */
466 if (np->rxopt.bits.rxoinfo) {
467 struct in6_pktinfo src_info;
468
469 src_info.ipi6_ifindex = opt->iif;
470 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
471 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
472 }
473 if (np->rxopt.bits.rxohlim) {
474 int hlim = ipv6_hdr(skb)->hop_limit;
475 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
476 }
477 if (np->rxopt.bits.ohopopts && opt->hop) {
478 u8 *ptr = nh + opt->hop;
479 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
480 }
481 if (np->rxopt.bits.odstopts && opt->dst0) {
482 u8 *ptr = nh + opt->dst0;
483 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
484 }
485 if (np->rxopt.bits.osrcrt && opt->srcrt) {
486 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
487 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
488 }
489 if (np->rxopt.bits.odstopts && opt->dst1) {
490 u8 *ptr = nh + opt->dst1;
491 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
492 }
493 return 0;
494 }
495
496 int datagram_send_ctl(struct net *net,
497 struct msghdr *msg, struct flowi *fl,
498 struct ipv6_txoptions *opt,
499 int *hlimit, int *tclass)
500 {
501 struct in6_pktinfo *src_info;
502 struct cmsghdr *cmsg;
503 struct ipv6_rt_hdr *rthdr;
504 struct ipv6_opt_hdr *hdr;
505 int len;
506 int err = 0;
507
508 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
509 int addr_type;
510
511 if (!CMSG_OK(msg, cmsg)) {
512 err = -EINVAL;
513 goto exit_f;
514 }
515
516 if (cmsg->cmsg_level != SOL_IPV6)
517 continue;
518
519 switch (cmsg->cmsg_type) {
520 case IPV6_PKTINFO:
521 case IPV6_2292PKTINFO:
522 {
523 struct net_device *dev = NULL;
524
525 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
526 err = -EINVAL;
527 goto exit_f;
528 }
529
530 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
531
532 if (src_info->ipi6_ifindex) {
533 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
534 return -EINVAL;
535 fl->oif = src_info->ipi6_ifindex;
536 }
537
538 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
539
540 rcu_read_lock();
541 if (fl->oif) {
542 dev = dev_get_by_index_rcu(net, fl->oif);
543 if (!dev) {
544 rcu_read_unlock();
545 return -ENODEV;
546 }
547 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
548 rcu_read_unlock();
549 return -EINVAL;
550 }
551
552 if (addr_type != IPV6_ADDR_ANY) {
553 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
554 if (!ipv6_chk_addr(net, &src_info->ipi6_addr,
555 strict ? dev : NULL, 0))
556 err = -EINVAL;
557 else
558 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
559 }
560
561 rcu_read_unlock();
562
563 if (err)
564 goto exit_f;
565
566 break;
567 }
568
569 case IPV6_FLOWINFO:
570 if (cmsg->cmsg_len < CMSG_LEN(4)) {
571 err = -EINVAL;
572 goto exit_f;
573 }
574
575 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
576 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
577 err = -EINVAL;
578 goto exit_f;
579 }
580 }
581 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
582 break;
583
584 case IPV6_2292HOPOPTS:
585 case IPV6_HOPOPTS:
586 if (opt->hopopt || 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 opt->opt_nflen += len;
602 opt->hopopt = hdr;
603 break;
604
605 case IPV6_2292DSTOPTS:
606 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
607 err = -EINVAL;
608 goto exit_f;
609 }
610
611 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
612 len = ((hdr->hdrlen + 1) << 3);
613 if (cmsg->cmsg_len < CMSG_LEN(len)) {
614 err = -EINVAL;
615 goto exit_f;
616 }
617 if (!capable(CAP_NET_RAW)) {
618 err = -EPERM;
619 goto exit_f;
620 }
621 if (opt->dst1opt) {
622 err = -EINVAL;
623 goto exit_f;
624 }
625 opt->opt_flen += len;
626 opt->dst1opt = hdr;
627 break;
628
629 case IPV6_DSTOPTS:
630 case IPV6_RTHDRDSTOPTS:
631 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
632 err = -EINVAL;
633 goto exit_f;
634 }
635
636 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
637 len = ((hdr->hdrlen + 1) << 3);
638 if (cmsg->cmsg_len < CMSG_LEN(len)) {
639 err = -EINVAL;
640 goto exit_f;
641 }
642 if (!capable(CAP_NET_RAW)) {
643 err = -EPERM;
644 goto exit_f;
645 }
646 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
647 opt->opt_flen += len;
648 opt->dst1opt = hdr;
649 } else {
650 opt->opt_nflen += len;
651 opt->dst0opt = hdr;
652 }
653 break;
654
655 case IPV6_2292RTHDR:
656 case IPV6_RTHDR:
657 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
658 err = -EINVAL;
659 goto exit_f;
660 }
661
662 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
663
664 switch (rthdr->type) {
665 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
666 case IPV6_SRCRT_TYPE_2:
667 if (rthdr->hdrlen != 2 ||
668 rthdr->segments_left != 1) {
669 err = -EINVAL;
670 goto exit_f;
671 }
672 break;
673 #endif
674 default:
675 err = -EINVAL;
676 goto exit_f;
677 }
678
679 len = ((rthdr->hdrlen + 1) << 3);
680
681 if (cmsg->cmsg_len < CMSG_LEN(len)) {
682 err = -EINVAL;
683 goto exit_f;
684 }
685
686 /* segments left must also match */
687 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
688 err = -EINVAL;
689 goto exit_f;
690 }
691
692 opt->opt_nflen += len;
693 opt->srcrt = rthdr;
694
695 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
696 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
697
698 opt->opt_nflen += dsthdrlen;
699 opt->dst0opt = opt->dst1opt;
700 opt->dst1opt = NULL;
701 opt->opt_flen -= dsthdrlen;
702 }
703
704 break;
705
706 case IPV6_2292HOPLIMIT:
707 case IPV6_HOPLIMIT:
708 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
709 err = -EINVAL;
710 goto exit_f;
711 }
712
713 *hlimit = *(int *)CMSG_DATA(cmsg);
714 if (*hlimit < -1 || *hlimit > 0xff) {
715 err = -EINVAL;
716 goto exit_f;
717 }
718
719 break;
720
721 case IPV6_TCLASS:
722 {
723 int tc;
724
725 err = -EINVAL;
726 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
727 goto exit_f;
728 }
729
730 tc = *(int *)CMSG_DATA(cmsg);
731 if (tc < -1 || tc > 0xff)
732 goto exit_f;
733
734 err = 0;
735 *tclass = tc;
736
737 break;
738 }
739 default:
740 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
741 cmsg->cmsg_type);
742 err = -EINVAL;
743 goto exit_f;
744 }
745 }
746
747 exit_f:
748 return err;
749 }
linux 2.6 git repository for openrd