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
ip6_datagram_connect(struct sock * sk,struct sockaddr * uaddr,int addr_len)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(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr);
102
103 if (ipv6_addr_any(&np->saddr)) {
104 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff),
105 inet->saddr);
106 }
107
108 if (ipv6_addr_any(&np->rcv_saddr)) {
109 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff),
110 inet->rcv_saddr);
111 }
112 goto out;
113 }
114
115 if (addr_type&IPV6_ADDR_LINKLOCAL) {
116 if (addr_len >= sizeof(struct sockaddr_in6) &&
117 usin->sin6_scope_id) {
118 if (sk->sk_bound_dev_if &&
119 sk->sk_bound_dev_if != usin->sin6_scope_id) {
120 err = -EINVAL;
121 goto out;
122 }
123 sk->sk_bound_dev_if = usin->sin6_scope_id;
124 }
125
126 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
127 sk->sk_bound_dev_if = np->mcast_oif;
128
129 /* Connect to link-local address requires an interface */
130 if (!sk->sk_bound_dev_if) {
131 err = -EINVAL;
132 goto out;
133 }
134 }
135
136 ipv6_addr_copy(&np->daddr, daddr);
137 np->flow_label = fl.fl6_flowlabel;
138
139 inet->dport = usin->sin6_port;
140
141 /*
142 * Check for a route to destination an obtain the
143 * destination cache for it.
144 */
145
146 fl.proto = sk->sk_protocol;
147 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
148 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
149 fl.oif = sk->sk_bound_dev_if;
150 fl.fl_ip_dport = inet->dport;
151 fl.fl_ip_sport = 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->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
ipv6_icmp_error(struct sock * sk,struct sk_buff * skb,int err,__be16 port,u32 info,u8 * payload)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 serr = SKB_EXT_ERR(skb);
226 serr->ee.ee_errno = err;
227 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
228 serr->ee.ee_type = icmph->icmp6_type;
229 serr->ee.ee_code = icmph->icmp6_code;
230 serr->ee.ee_pad = 0;
231 serr->ee.ee_info = info;
232 serr->ee.ee_data = 0;
233 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
234 skb_network_header(skb);
235 serr->port = port;
236
237 __skb_pull(skb, payload - skb->data);
238 skb_reset_transport_header(skb);
239
240 if (sock_queue_err_skb(sk, skb))
241 kfree_skb(skb);
242 }
243
ipv6_local_error(struct sock * sk,int err,struct flowi * fl,u32 info)244 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
245 {
246 struct ipv6_pinfo *np = inet6_sk(sk);
247 struct sock_exterr_skb *serr;
248 struct ipv6hdr *iph;
249 struct sk_buff *skb;
250
251 if (!np->recverr)
252 return;
253
254 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
255 if (!skb)
256 return;
257
258 skb_put(skb, sizeof(struct ipv6hdr));
259 skb_reset_network_header(skb);
260 iph = ipv6_hdr(skb);
261 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
262
263 serr = SKB_EXT_ERR(skb);
264 serr->ee.ee_errno = err;
265 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
266 serr->ee.ee_type = 0;
267 serr->ee.ee_code = 0;
268 serr->ee.ee_pad = 0;
269 serr->ee.ee_info = info;
270 serr->ee.ee_data = 0;
271 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
272 serr->port = fl->fl_ip_dport;
273
274 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
275 skb_reset_transport_header(skb);
276
277 if (sock_queue_err_skb(sk, skb))
278 kfree_skb(skb);
279 }
280
281 /*
282 * Handle MSG_ERRQUEUE
283 */
ipv6_recv_error(struct sock * sk,struct msghdr * msg,int len)284 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
285 {
286 struct ipv6_pinfo *np = inet6_sk(sk);
287 struct sock_exterr_skb *serr;
288 struct sk_buff *skb, *skb2;
289 struct sockaddr_in6 *sin;
290 struct {
291 struct sock_extended_err ee;
292 struct sockaddr_in6 offender;
293 } errhdr;
294 int err;
295 int copied;
296
297 err = -EAGAIN;
298 skb = skb_dequeue(&sk->sk_error_queue);
299 if (skb == NULL)
300 goto out;
301
302 copied = skb->len;
303 if (copied > len) {
304 msg->msg_flags |= MSG_TRUNC;
305 copied = len;
306 }
307 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
308 if (err)
309 goto out_free_skb;
310
311 sock_recv_timestamp(msg, sk, skb);
312
313 serr = SKB_EXT_ERR(skb);
314
315 sin = (struct sockaddr_in6 *)msg->msg_name;
316 if (sin) {
317 const unsigned char *nh = skb_network_header(skb);
318 sin->sin6_family = AF_INET6;
319 sin->sin6_flowinfo = 0;
320 sin->sin6_port = serr->port;
321 sin->sin6_scope_id = 0;
322 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
323 ipv6_addr_copy(&sin->sin6_addr,
324 (struct in6_addr *)(nh + serr->addr_offset));
325 if (np->sndflow)
326 sin->sin6_flowinfo =
327 (*(__be32 *)(nh + serr->addr_offset - 24) &
328 IPV6_FLOWINFO_MASK);
329 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
330 sin->sin6_scope_id = IP6CB(skb)->iif;
331 } else {
332 ipv6_addr_set(&sin->sin6_addr, 0, 0,
333 htonl(0xffff),
334 *(__be32 *)(nh + serr->addr_offset));
335 }
336 }
337
338 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
339 sin = &errhdr.offender;
340 sin->sin6_family = AF_UNSPEC;
341 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
342 sin->sin6_family = AF_INET6;
343 sin->sin6_flowinfo = 0;
344 sin->sin6_scope_id = 0;
345 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
346 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
347 if (np->rxopt.all)
348 datagram_recv_ctl(sk, msg, skb);
349 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
350 sin->sin6_scope_id = IP6CB(skb)->iif;
351 } else {
352 struct inet_sock *inet = inet_sk(sk);
353
354 ipv6_addr_set(&sin->sin6_addr, 0, 0,
355 htonl(0xffff), ip_hdr(skb)->saddr);
356 if (inet->cmsg_flags)
357 ip_cmsg_recv(msg, skb);
358 }
359 }
360
361 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
362
363 /* Now we could try to dump offended packet options */
364
365 msg->msg_flags |= MSG_ERRQUEUE;
366 err = copied;
367
368 /* Reset and regenerate socket error */
369 spin_lock_bh(&sk->sk_error_queue.lock);
370 sk->sk_err = 0;
371 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
372 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
373 spin_unlock_bh(&sk->sk_error_queue.lock);
374 sk->sk_error_report(sk);
375 } else {
376 spin_unlock_bh(&sk->sk_error_queue.lock);
377 }
378
379 out_free_skb:
380 kfree_skb(skb);
381 out:
382 return err;
383 }
384
385
386
datagram_recv_ctl(struct sock * sk,struct msghdr * msg,struct sk_buff * skb)387 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
388 {
389 struct ipv6_pinfo *np = inet6_sk(sk);
390 struct inet6_skb_parm *opt = IP6CB(skb);
391 unsigned char *nh = skb_network_header(skb);
392
393 if (np->rxopt.bits.rxinfo) {
394 struct in6_pktinfo src_info;
395
396 src_info.ipi6_ifindex = opt->iif;
397 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
398 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
399 }
400
401 if (np->rxopt.bits.rxhlim) {
402 int hlim = ipv6_hdr(skb)->hop_limit;
403 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
404 }
405
406 if (np->rxopt.bits.rxtclass) {
407 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
408 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
409 }
410
411 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
412 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
413 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
414 }
415
416 /* HbH is allowed only once */
417 if (np->rxopt.bits.hopopts && opt->hop) {
418 u8 *ptr = nh + opt->hop;
419 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
420 }
421
422 if (opt->lastopt &&
423 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
424 /*
425 * Silly enough, but we need to reparse in order to
426 * report extension headers (except for HbH)
427 * in order.
428 *
429 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
430 * (and WILL NOT be) defined because
431 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
432 */
433 unsigned int off = sizeof(struct ipv6hdr);
434 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
435
436 while (off <= opt->lastopt) {
437 unsigned len;
438 u8 *ptr = nh + off;
439
440 switch(nexthdr) {
441 case IPPROTO_DSTOPTS:
442 nexthdr = ptr[0];
443 len = (ptr[1] + 1) << 3;
444 if (np->rxopt.bits.dstopts)
445 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
446 break;
447 case IPPROTO_ROUTING:
448 nexthdr = ptr[0];
449 len = (ptr[1] + 1) << 3;
450 if (np->rxopt.bits.srcrt)
451 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
452 break;
453 case IPPROTO_AH:
454 nexthdr = ptr[0];
455 len = (ptr[1] + 2) << 2;
456 break;
457 default:
458 nexthdr = ptr[0];
459 len = (ptr[1] + 1) << 3;
460 break;
461 }
462
463 off += len;
464 }
465 }
466
467 /* socket options in old style */
468 if (np->rxopt.bits.rxoinfo) {
469 struct in6_pktinfo src_info;
470
471 src_info.ipi6_ifindex = opt->iif;
472 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
473 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
474 }
475 if (np->rxopt.bits.rxohlim) {
476 int hlim = ipv6_hdr(skb)->hop_limit;
477 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
478 }
479 if (np->rxopt.bits.ohopopts && opt->hop) {
480 u8 *ptr = nh + opt->hop;
481 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
482 }
483 if (np->rxopt.bits.odstopts && opt->dst0) {
484 u8 *ptr = nh + opt->dst0;
485 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
486 }
487 if (np->rxopt.bits.osrcrt && opt->srcrt) {
488 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
489 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
490 }
491 if (np->rxopt.bits.odstopts && opt->dst1) {
492 u8 *ptr = nh + opt->dst1;
493 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
494 }
495 return 0;
496 }
497
datagram_send_ctl(struct net * net,struct msghdr * msg,struct flowi * fl,struct ipv6_txoptions * opt,int * hlimit,int * tclass)498 int datagram_send_ctl(struct net *net,
499 struct msghdr *msg, struct flowi *fl,
500 struct ipv6_txoptions *opt,
501 int *hlimit, int *tclass)
502 {
503 struct in6_pktinfo *src_info;
504 struct cmsghdr *cmsg;
505 struct ipv6_rt_hdr *rthdr;
506 struct ipv6_opt_hdr *hdr;
507 int len;
508 int err = 0;
509
510 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
511 int addr_type;
512
513 if (!CMSG_OK(msg, cmsg)) {
514 err = -EINVAL;
515 goto exit_f;
516 }
517
518 if (cmsg->cmsg_level != SOL_IPV6)
519 continue;
520
521 switch (cmsg->cmsg_type) {
522 case IPV6_PKTINFO:
523 case IPV6_2292PKTINFO:
524 {
525 struct net_device *dev = NULL;
526
527 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
528 err = -EINVAL;
529 goto exit_f;
530 }
531
532 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
533
534 if (src_info->ipi6_ifindex) {
535 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
536 return -EINVAL;
537 fl->oif = src_info->ipi6_ifindex;
538 }
539
540 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
541
542 if (fl->oif) {
543 dev = dev_get_by_index(net, fl->oif);
544 if (!dev)
545 return -ENODEV;
546 } else if (addr_type & IPV6_ADDR_LINKLOCAL)
547 return -EINVAL;
548
549 if (addr_type != IPV6_ADDR_ANY) {
550 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
551 if (!ipv6_chk_addr(net, &src_info->ipi6_addr,
552 strict ? dev : NULL, 0))
553 err = -EINVAL;
554 else
555 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
556 }
557
558 if (dev)
559 dev_put(dev);
560
561 if (err)
562 goto exit_f;
563
564 break;
565 }
566
567 case IPV6_FLOWINFO:
568 if (cmsg->cmsg_len < CMSG_LEN(4)) {
569 err = -EINVAL;
570 goto exit_f;
571 }
572
573 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
574 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
575 err = -EINVAL;
576 goto exit_f;
577 }
578 }
579 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
580 break;
581
582 case IPV6_2292HOPOPTS:
583 case IPV6_HOPOPTS:
584 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
585 err = -EINVAL;
586 goto exit_f;
587 }
588
589 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
590 len = ((hdr->hdrlen + 1) << 3);
591 if (cmsg->cmsg_len < CMSG_LEN(len)) {
592 err = -EINVAL;
593 goto exit_f;
594 }
595 if (!capable(CAP_NET_RAW)) {
596 err = -EPERM;
597 goto exit_f;
598 }
599 opt->opt_nflen += len;
600 opt->hopopt = hdr;
601 break;
602
603 case IPV6_2292DSTOPTS:
604 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
605 err = -EINVAL;
606 goto exit_f;
607 }
608
609 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
610 len = ((hdr->hdrlen + 1) << 3);
611 if (cmsg->cmsg_len < CMSG_LEN(len)) {
612 err = -EINVAL;
613 goto exit_f;
614 }
615 if (!capable(CAP_NET_RAW)) {
616 err = -EPERM;
617 goto exit_f;
618 }
619 if (opt->dst1opt) {
620 err = -EINVAL;
621 goto exit_f;
622 }
623 opt->opt_flen += len;
624 opt->dst1opt = hdr;
625 break;
626
627 case IPV6_DSTOPTS:
628 case IPV6_RTHDRDSTOPTS:
629 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
630 err = -EINVAL;
631 goto exit_f;
632 }
633
634 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
635 len = ((hdr->hdrlen + 1) << 3);
636 if (cmsg->cmsg_len < CMSG_LEN(len)) {
637 err = -EINVAL;
638 goto exit_f;
639 }
640 if (!capable(CAP_NET_RAW)) {
641 err = -EPERM;
642 goto exit_f;
643 }
644 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
645 opt->opt_flen += len;
646 opt->dst1opt = hdr;
647 } else {
648 opt->opt_nflen += len;
649 opt->dst0opt = hdr;
650 }
651 break;
652
653 case IPV6_2292RTHDR:
654 case IPV6_RTHDR:
655 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
656 err = -EINVAL;
657 goto exit_f;
658 }
659
660 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
661
662 switch (rthdr->type) {
663 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
664 case IPV6_SRCRT_TYPE_2:
665 if (rthdr->hdrlen != 2 ||
666 rthdr->segments_left != 1) {
667 err = -EINVAL;
668 goto exit_f;
669 }
670 break;
671 #endif
672 default:
673 err = -EINVAL;
674 goto exit_f;
675 }
676
677 len = ((rthdr->hdrlen + 1) << 3);
678
679 if (cmsg->cmsg_len < CMSG_LEN(len)) {
680 err = -EINVAL;
681 goto exit_f;
682 }
683
684 /* segments left must also match */
685 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
686 err = -EINVAL;
687 goto exit_f;
688 }
689
690 opt->opt_nflen += len;
691 opt->srcrt = rthdr;
692
693 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
694 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
695
696 opt->opt_nflen += dsthdrlen;
697 opt->dst0opt = opt->dst1opt;
698 opt->dst1opt = NULL;
699 opt->opt_flen -= dsthdrlen;
700 }
701
702 break;
703
704 case IPV6_2292HOPLIMIT:
705 case IPV6_HOPLIMIT:
706 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
707 err = -EINVAL;
708 goto exit_f;
709 }
710
711 *hlimit = *(int *)CMSG_DATA(cmsg);
712 if (*hlimit < -1 || *hlimit > 0xff) {
713 err = -EINVAL;
714 goto exit_f;
715 }
716
717 break;
718
719 case IPV6_TCLASS:
720 {
721 int tc;
722
723 err = -EINVAL;
724 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
725 goto exit_f;
726 }
727
728 tc = *(int *)CMSG_DATA(cmsg);
729 if (tc < -1 || tc > 0xff)
730 goto exit_f;
731
732 err = 0;
733 *tclass = tc;
734
735 break;
736 }
737 default:
738 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
739 cmsg->cmsg_type);
740 err = -EINVAL;
741 goto exit_f;
742 }
743 }
744
745 exit_f:
746 return err;
747 }
748