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USB: g_hid: unregister platform driver on probe/usb_composite_register errors
[linux-2.6.git] / net / ipv6 / datagram.c
blob61573885e4517abca63a36ae1f30999470ef2a32
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 skb->protocol = htons(ETH_P_IPV6);
226
227 serr = SKB_EXT_ERR(skb);
228 serr->ee.ee_errno = err;
229 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
230 serr->ee.ee_type = icmph->icmp6_type;
231 serr->ee.ee_code = icmph->icmp6_code;
232 serr->ee.ee_pad = 0;
233 serr->ee.ee_info = info;
234 serr->ee.ee_data = 0;
235 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
236 skb_network_header(skb);
237 serr->port = port;
238
239 __skb_pull(skb, payload - skb->data);
240 skb_reset_transport_header(skb);
241
242 if (sock_queue_err_skb(sk, skb))
243 kfree_skb(skb);
244 }
245
246 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
247 {
248 struct ipv6_pinfo *np = inet6_sk(sk);
249 struct sock_exterr_skb *serr;
250 struct ipv6hdr *iph;
251 struct sk_buff *skb;
252
253 if (!np->recverr)
254 return;
255
256 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
257 if (!skb)
258 return;
259
260 skb->protocol = htons(ETH_P_IPV6);
261
262 skb_put(skb, sizeof(struct ipv6hdr));
263 skb_reset_network_header(skb);
264 iph = ipv6_hdr(skb);
265 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
266
267 serr = SKB_EXT_ERR(skb);
268 serr->ee.ee_errno = err;
269 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
270 serr->ee.ee_type = 0;
271 serr->ee.ee_code = 0;
272 serr->ee.ee_pad = 0;
273 serr->ee.ee_info = info;
274 serr->ee.ee_data = 0;
275 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
276 serr->port = fl->fl_ip_dport;
277
278 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
279 skb_reset_transport_header(skb);
280
281 if (sock_queue_err_skb(sk, skb))
282 kfree_skb(skb);
283 }
284
285 /*
286 * Handle MSG_ERRQUEUE
287 */
288 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
289 {
290 struct ipv6_pinfo *np = inet6_sk(sk);
291 struct sock_exterr_skb *serr;
292 struct sk_buff *skb, *skb2;
293 struct sockaddr_in6 *sin;
294 struct {
295 struct sock_extended_err ee;
296 struct sockaddr_in6 offender;
297 } errhdr;
298 int err;
299 int copied;
300
301 err = -EAGAIN;
302 skb = skb_dequeue(&sk->sk_error_queue);
303 if (skb == NULL)
304 goto out;
305
306 copied = skb->len;
307 if (copied > len) {
308 msg->msg_flags |= MSG_TRUNC;
309 copied = len;
310 }
311 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
312 if (err)
313 goto out_free_skb;
314
315 sock_recv_timestamp(msg, sk, skb);
316
317 serr = SKB_EXT_ERR(skb);
318
319 sin = (struct sockaddr_in6 *)msg->msg_name;
320 if (sin) {
321 const unsigned char *nh = skb_network_header(skb);
322 sin->sin6_family = AF_INET6;
323 sin->sin6_flowinfo = 0;
324 sin->sin6_port = serr->port;
325 sin->sin6_scope_id = 0;
326 if (skb->protocol == htons(ETH_P_IPV6)) {
327 ipv6_addr_copy(&sin->sin6_addr,
328 (struct in6_addr *)(nh + serr->addr_offset));
329 if (np->sndflow)
330 sin->sin6_flowinfo =
331 (*(__be32 *)(nh + serr->addr_offset - 24) &
332 IPV6_FLOWINFO_MASK);
333 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
334 sin->sin6_scope_id = IP6CB(skb)->iif;
335 } else {
336 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
337 &sin->sin6_addr);
338 }
339 }
340
341 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
342 sin = &errhdr.offender;
343 sin->sin6_family = AF_UNSPEC;
344 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
345 sin->sin6_family = AF_INET6;
346 sin->sin6_flowinfo = 0;
347 sin->sin6_scope_id = 0;
348 if (skb->protocol == htons(ETH_P_IPV6)) {
349 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
350 if (np->rxopt.all)
351 datagram_recv_ctl(sk, msg, skb);
352 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
353 sin->sin6_scope_id = IP6CB(skb)->iif;
354 } else {
355 struct inet_sock *inet = inet_sk(sk);
356
357 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
358 &sin->sin6_addr);
359 if (inet->cmsg_flags)
360 ip_cmsg_recv(msg, skb);
361 }
362 }
363
364 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
365
366 /* Now we could try to dump offended packet options */
367
368 msg->msg_flags |= MSG_ERRQUEUE;
369 err = copied;
370
371 /* Reset and regenerate socket error */
372 spin_lock_bh(&sk->sk_error_queue.lock);
373 sk->sk_err = 0;
374 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
375 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
376 spin_unlock_bh(&sk->sk_error_queue.lock);
377 sk->sk_error_report(sk);
378 } else {
379 spin_unlock_bh(&sk->sk_error_queue.lock);
380 }
381
382 out_free_skb:
383 kfree_skb(skb);
384 out:
385 return err;
386 }
387
388
389
390 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
391 {
392 struct ipv6_pinfo *np = inet6_sk(sk);
393 struct inet6_skb_parm *opt = IP6CB(skb);
394 unsigned char *nh = skb_network_header(skb);
395
396 if (np->rxopt.bits.rxinfo) {
397 struct in6_pktinfo src_info;
398
399 src_info.ipi6_ifindex = opt->iif;
400 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
401 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
402 }
403
404 if (np->rxopt.bits.rxhlim) {
405 int hlim = ipv6_hdr(skb)->hop_limit;
406 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
407 }
408
409 if (np->rxopt.bits.rxtclass) {
410 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
411 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
412 }
413
414 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
415 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
416 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
417 }
418
419 /* HbH is allowed only once */
420 if (np->rxopt.bits.hopopts && opt->hop) {
421 u8 *ptr = nh + opt->hop;
422 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
423 }
424
425 if (opt->lastopt &&
426 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
427 /*
428 * Silly enough, but we need to reparse in order to
429 * report extension headers (except for HbH)
430 * in order.
431 *
432 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
433 * (and WILL NOT be) defined because
434 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
435 */
436 unsigned int off = sizeof(struct ipv6hdr);
437 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
438
439 while (off <= opt->lastopt) {
440 unsigned len;
441 u8 *ptr = nh + off;
442
443 switch(nexthdr) {
444 case IPPROTO_DSTOPTS:
445 nexthdr = ptr[0];
446 len = (ptr[1] + 1) << 3;
447 if (np->rxopt.bits.dstopts)
448 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
449 break;
450 case IPPROTO_ROUTING:
451 nexthdr = ptr[0];
452 len = (ptr[1] + 1) << 3;
453 if (np->rxopt.bits.srcrt)
454 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
455 break;
456 case IPPROTO_AH:
457 nexthdr = ptr[0];
458 len = (ptr[1] + 2) << 2;
459 break;
460 default:
461 nexthdr = ptr[0];
462 len = (ptr[1] + 1) << 3;
463 break;
464 }
465
466 off += len;
467 }
468 }
469
470 /* socket options in old style */
471 if (np->rxopt.bits.rxoinfo) {
472 struct in6_pktinfo src_info;
473
474 src_info.ipi6_ifindex = opt->iif;
475 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
476 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
477 }
478 if (np->rxopt.bits.rxohlim) {
479 int hlim = ipv6_hdr(skb)->hop_limit;
480 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
481 }
482 if (np->rxopt.bits.ohopopts && opt->hop) {
483 u8 *ptr = nh + opt->hop;
484 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
485 }
486 if (np->rxopt.bits.odstopts && opt->dst0) {
487 u8 *ptr = nh + opt->dst0;
488 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
489 }
490 if (np->rxopt.bits.osrcrt && opt->srcrt) {
491 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
492 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
493 }
494 if (np->rxopt.bits.odstopts && opt->dst1) {
495 u8 *ptr = nh + opt->dst1;
496 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
497 }
498 return 0;
499 }
500
501 int datagram_send_ctl(struct net *net,
502 struct msghdr *msg, struct flowi *fl,
503 struct ipv6_txoptions *opt,
504 int *hlimit, int *tclass)
505 {
506 struct in6_pktinfo *src_info;
507 struct cmsghdr *cmsg;
508 struct ipv6_rt_hdr *rthdr;
509 struct ipv6_opt_hdr *hdr;
510 int len;
511 int err = 0;
512
513 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
514 int addr_type;
515
516 if (!CMSG_OK(msg, cmsg)) {
517 err = -EINVAL;
518 goto exit_f;
519 }
520
521 if (cmsg->cmsg_level != SOL_IPV6)
522 continue;
523
524 switch (cmsg->cmsg_type) {
525 case IPV6_PKTINFO:
526 case IPV6_2292PKTINFO:
527 {
528 struct net_device *dev = NULL;
529
530 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
531 err = -EINVAL;
532 goto exit_f;
533 }
534
535 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
536
537 if (src_info->ipi6_ifindex) {
538 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
539 return -EINVAL;
540 fl->oif = src_info->ipi6_ifindex;
541 }
542
543 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
544
545 rcu_read_lock();
546 if (fl->oif) {
547 dev = dev_get_by_index_rcu(net, fl->oif);
548 if (!dev) {
549 rcu_read_unlock();
550 return -ENODEV;
551 }
552 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
553 rcu_read_unlock();
554 return -EINVAL;
555 }
556
557 if (addr_type != IPV6_ADDR_ANY) {
558 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
559 if (!ipv6_chk_addr(net, &src_info->ipi6_addr,
560 strict ? dev : NULL, 0))
561 err = -EINVAL;
562 else
563 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
564 }
565
566 rcu_read_unlock();
567
568 if (err)
569 goto exit_f;
570
571 break;
572 }
573
574 case IPV6_FLOWINFO:
575 if (cmsg->cmsg_len < CMSG_LEN(4)) {
576 err = -EINVAL;
577 goto exit_f;
578 }
579
580 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
581 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
582 err = -EINVAL;
583 goto exit_f;
584 }
585 }
586 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
587 break;
588
589 case IPV6_2292HOPOPTS:
590 case IPV6_HOPOPTS:
591 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
592 err = -EINVAL;
593 goto exit_f;
594 }
595
596 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
597 len = ((hdr->hdrlen + 1) << 3);
598 if (cmsg->cmsg_len < CMSG_LEN(len)) {
599 err = -EINVAL;
600 goto exit_f;
601 }
602 if (!capable(CAP_NET_RAW)) {
603 err = -EPERM;
604 goto exit_f;
605 }
606 opt->opt_nflen += len;
607 opt->hopopt = hdr;
608 break;
609
610 case IPV6_2292DSTOPTS:
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 (opt->dst1opt) {
627 err = -EINVAL;
628 goto exit_f;
629 }
630 opt->opt_flen += len;
631 opt->dst1opt = hdr;
632 break;
633
634 case IPV6_DSTOPTS:
635 case IPV6_RTHDRDSTOPTS:
636 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
637 err = -EINVAL;
638 goto exit_f;
639 }
640
641 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
642 len = ((hdr->hdrlen + 1) << 3);
643 if (cmsg->cmsg_len < CMSG_LEN(len)) {
644 err = -EINVAL;
645 goto exit_f;
646 }
647 if (!capable(CAP_NET_RAW)) {
648 err = -EPERM;
649 goto exit_f;
650 }
651 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
652 opt->opt_flen += len;
653 opt->dst1opt = hdr;
654 } else {
655 opt->opt_nflen += len;
656 opt->dst0opt = hdr;
657 }
658 break;
659
660 case IPV6_2292RTHDR:
661 case IPV6_RTHDR:
662 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
663 err = -EINVAL;
664 goto exit_f;
665 }
666
667 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
668
669 switch (rthdr->type) {
670 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
671 case IPV6_SRCRT_TYPE_2:
672 if (rthdr->hdrlen != 2 ||
673 rthdr->segments_left != 1) {
674 err = -EINVAL;
675 goto exit_f;
676 }
677 break;
678 #endif
679 default:
680 err = -EINVAL;
681 goto exit_f;
682 }
683
684 len = ((rthdr->hdrlen + 1) << 3);
685
686 if (cmsg->cmsg_len < CMSG_LEN(len)) {
687 err = -EINVAL;
688 goto exit_f;
689 }
690
691 /* segments left must also match */
692 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
693 err = -EINVAL;
694 goto exit_f;
695 }
696
697 opt->opt_nflen += len;
698 opt->srcrt = rthdr;
699
700 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
701 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
702
703 opt->opt_nflen += dsthdrlen;
704 opt->dst0opt = opt->dst1opt;
705 opt->dst1opt = NULL;
706 opt->opt_flen -= dsthdrlen;
707 }
708
709 break;
710
711 case IPV6_2292HOPLIMIT:
712 case IPV6_HOPLIMIT:
713 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
714 err = -EINVAL;
715 goto exit_f;
716 }
717
718 *hlimit = *(int *)CMSG_DATA(cmsg);
719 if (*hlimit < -1 || *hlimit > 0xff) {
720 err = -EINVAL;
721 goto exit_f;
722 }
723
724 break;
725
726 case IPV6_TCLASS:
727 {
728 int tc;
729
730 err = -EINVAL;
731 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
732 goto exit_f;
733 }
734
735 tc = *(int *)CMSG_DATA(cmsg);
736 if (tc < -1 || tc > 0xff)
737 goto exit_f;
738
739 err = 0;
740 *tclass = tc;
741
742 break;
743 }
744 default:
745 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
746 cmsg->cmsg_type);
747 err = -EINVAL;
748 goto exit_f;
749 }
750 }
751
752 exit_f:
753 return err;
754 }
Linus' kernel tree