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fed up with those stupid warnings
[mmotm.git] / net / ipv6 / datagram.c
blobdbfec7147aa53fc1e22fe568be22a10d5cd9879d
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->daddr, &np->daddr);
102
103 if (ipv6_addr_any(&np->saddr))
104 ipv6_addr_set_v4mapped(inet->saddr, &np->saddr);
105
106 if (ipv6_addr_any(&np->rcv_saddr))
107 ipv6_addr_set_v4mapped(inet->rcv_saddr, &np->rcv_saddr);
108
109 goto out;
110 }
111
112 if (addr_type&IPV6_ADDR_LINKLOCAL) {
113 if (addr_len >= sizeof(struct sockaddr_in6) &&
114 usin->sin6_scope_id) {
115 if (sk->sk_bound_dev_if &&
116 sk->sk_bound_dev_if != usin->sin6_scope_id) {
117 err = -EINVAL;
118 goto out;
119 }
120 sk->sk_bound_dev_if = usin->sin6_scope_id;
121 }
122
123 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
124 sk->sk_bound_dev_if = np->mcast_oif;
125
126 /* Connect to link-local address requires an interface */
127 if (!sk->sk_bound_dev_if) {
128 err = -EINVAL;
129 goto out;
130 }
131 }
132
133 ipv6_addr_copy(&np->daddr, daddr);
134 np->flow_label = fl.fl6_flowlabel;
135
136 inet->dport = usin->sin6_port;
137
138 /*
139 * Check for a route to destination an obtain the
140 * destination cache for it.
141 */
142
143 fl.proto = sk->sk_protocol;
144 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
145 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
146 fl.oif = sk->sk_bound_dev_if;
147 fl.mark = sk->sk_mark;
148 fl.fl_ip_dport = inet->dport;
149 fl.fl_ip_sport = inet->sport;
150
151 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
152 fl.oif = np->mcast_oif;
153
154 security_sk_classify_flow(sk, &fl);
155
156 if (flowlabel) {
157 if (flowlabel->opt && flowlabel->opt->srcrt) {
158 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
159 ipv6_addr_copy(&final, &fl.fl6_dst);
160 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
161 final_p = &final;
162 }
163 } else if (np->opt && np->opt->srcrt) {
164 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
165 ipv6_addr_copy(&final, &fl.fl6_dst);
166 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
167 final_p = &final;
168 }
169
170 err = ip6_dst_lookup(sk, &dst, &fl);
171 if (err)
172 goto out;
173 if (final_p)
174 ipv6_addr_copy(&fl.fl6_dst, final_p);
175
176 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
177 if (err < 0) {
178 if (err == -EREMOTE)
179 err = ip6_dst_blackhole(sk, &dst, &fl);
180 if (err < 0)
181 goto out;
182 }
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 __be16 port, u32 info, u8 *payload)
211 {
212 struct ipv6_pinfo *np = inet6_sk(sk);
213 struct icmp6hdr *icmph = icmp6_hdr(skb);
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) -
232 skb_network_header(skb);
233 serr->port = port;
234
235 __skb_pull(skb, payload - skb->data);
236 skb_reset_transport_header(skb);
237
238 if (sock_queue_err_skb(sk, skb))
239 kfree_skb(skb);
240 }
241
242 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
243 {
244 struct ipv6_pinfo *np = inet6_sk(sk);
245 struct sock_exterr_skb *serr;
246 struct ipv6hdr *iph;
247 struct sk_buff *skb;
248
249 if (!np->recverr)
250 return;
251
252 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
253 if (!skb)
254 return;
255
256 skb_put(skb, sizeof(struct ipv6hdr));
257 skb_reset_network_header(skb);
258 iph = ipv6_hdr(skb);
259 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
260
261 serr = SKB_EXT_ERR(skb);
262 serr->ee.ee_errno = err;
263 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
264 serr->ee.ee_type = 0;
265 serr->ee.ee_code = 0;
266 serr->ee.ee_pad = 0;
267 serr->ee.ee_info = info;
268 serr->ee.ee_data = 0;
269 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
270 serr->port = fl->fl_ip_dport;
271
272 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
273 skb_reset_transport_header(skb);
274
275 if (sock_queue_err_skb(sk, skb))
276 kfree_skb(skb);
277 }
278
279 /*
280 * Handle MSG_ERRQUEUE
281 */
282 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
283 {
284 struct ipv6_pinfo *np = inet6_sk(sk);
285 struct sock_exterr_skb *serr;
286 struct sk_buff *skb, *skb2;
287 struct sockaddr_in6 *sin;
288 struct {
289 struct sock_extended_err ee;
290 struct sockaddr_in6 offender;
291 } errhdr;
292 int err;
293 int copied;
294
295 err = -EAGAIN;
296 skb = skb_dequeue(&sk->sk_error_queue);
297 if (skb == NULL)
298 goto out;
299
300 copied = skb->len;
301 if (copied > len) {
302 msg->msg_flags |= MSG_TRUNC;
303 copied = len;
304 }
305 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
306 if (err)
307 goto out_free_skb;
308
309 sock_recv_timestamp(msg, sk, skb);
310
311 serr = SKB_EXT_ERR(skb);
312
313 sin = (struct sockaddr_in6 *)msg->msg_name;
314 if (sin) {
315 const unsigned char *nh = skb_network_header(skb);
316 sin->sin6_family = AF_INET6;
317 sin->sin6_flowinfo = 0;
318 sin->sin6_port = serr->port;
319 sin->sin6_scope_id = 0;
320 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
321 ipv6_addr_copy(&sin->sin6_addr,
322 (struct in6_addr *)(nh + serr->addr_offset));
323 if (np->sndflow)
324 sin->sin6_flowinfo =
325 (*(__be32 *)(nh + serr->addr_offset - 24) &
326 IPV6_FLOWINFO_MASK);
327 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
328 sin->sin6_scope_id = IP6CB(skb)->iif;
329 } else {
330 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
331 &sin->sin6_addr);
332 }
333 }
334
335 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
336 sin = &errhdr.offender;
337 sin->sin6_family = AF_UNSPEC;
338 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
339 sin->sin6_family = AF_INET6;
340 sin->sin6_flowinfo = 0;
341 sin->sin6_scope_id = 0;
342 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
343 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
344 if (np->rxopt.all)
345 datagram_recv_ctl(sk, msg, skb);
346 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
347 sin->sin6_scope_id = IP6CB(skb)->iif;
348 } else {
349 struct inet_sock *inet = inet_sk(sk);
350
351 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
352 &sin->sin6_addr);
353 if (inet->cmsg_flags)
354 ip_cmsg_recv(msg, skb);
355 }
356 }
357
358 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
359
360 /* Now we could try to dump offended packet options */
361
362 msg->msg_flags |= MSG_ERRQUEUE;
363 err = copied;
364
365 /* Reset and regenerate socket error */
366 spin_lock_bh(&sk->sk_error_queue.lock);
367 sk->sk_err = 0;
368 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
369 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
370 spin_unlock_bh(&sk->sk_error_queue.lock);
371 sk->sk_error_report(sk);
372 } else {
373 spin_unlock_bh(&sk->sk_error_queue.lock);
374 }
375
376 out_free_skb:
377 kfree_skb(skb);
378 out:
379 return err;
380 }
381
382
383
384 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
385 {
386 struct ipv6_pinfo *np = inet6_sk(sk);
387 struct inet6_skb_parm *opt = IP6CB(skb);
388 unsigned char *nh = skb_network_header(skb);
389
390 if (np->rxopt.bits.rxinfo) {
391 struct in6_pktinfo src_info;
392
393 src_info.ipi6_ifindex = opt->iif;
394 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
395 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
396 }
397
398 if (np->rxopt.bits.rxhlim) {
399 int hlim = ipv6_hdr(skb)->hop_limit;
400 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
401 }
402
403 if (np->rxopt.bits.rxtclass) {
404 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
405 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
406 }
407
408 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
409 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
410 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
411 }
412
413 /* HbH is allowed only once */
414 if (np->rxopt.bits.hopopts && opt->hop) {
415 u8 *ptr = nh + opt->hop;
416 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
417 }
418
419 if (opt->lastopt &&
420 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
421 /*
422 * Silly enough, but we need to reparse in order to
423 * report extension headers (except for HbH)
424 * in order.
425 *
426 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
427 * (and WILL NOT be) defined because
428 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
429 */
430 unsigned int off = sizeof(struct ipv6hdr);
431 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
432
433 while (off <= opt->lastopt) {
434 unsigned len;
435 u8 *ptr = nh + off;
436
437 switch(nexthdr) {
438 case IPPROTO_DSTOPTS:
439 nexthdr = ptr[0];
440 len = (ptr[1] + 1) << 3;
441 if (np->rxopt.bits.dstopts)
442 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
443 break;
444 case IPPROTO_ROUTING:
445 nexthdr = ptr[0];
446 len = (ptr[1] + 1) << 3;
447 if (np->rxopt.bits.srcrt)
448 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
449 break;
450 case IPPROTO_AH:
451 nexthdr = ptr[0];
452 len = (ptr[1] + 2) << 2;
453 break;
454 default:
455 nexthdr = ptr[0];
456 len = (ptr[1] + 1) << 3;
457 break;
458 }
459
460 off += len;
461 }
462 }
463
464 /* socket options in old style */
465 if (np->rxopt.bits.rxoinfo) {
466 struct in6_pktinfo src_info;
467
468 src_info.ipi6_ifindex = opt->iif;
469 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
470 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
471 }
472 if (np->rxopt.bits.rxohlim) {
473 int hlim = ipv6_hdr(skb)->hop_limit;
474 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
475 }
476 if (np->rxopt.bits.ohopopts && opt->hop) {
477 u8 *ptr = nh + opt->hop;
478 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
479 }
480 if (np->rxopt.bits.odstopts && opt->dst0) {
481 u8 *ptr = nh + opt->dst0;
482 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
483 }
484 if (np->rxopt.bits.osrcrt && opt->srcrt) {
485 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
486 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
487 }
488 if (np->rxopt.bits.odstopts && opt->dst1) {
489 u8 *ptr = nh + opt->dst1;
490 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
491 }
492 return 0;
493 }
494
495 int datagram_send_ctl(struct net *net,
496 struct msghdr *msg, struct flowi *fl,
497 struct ipv6_txoptions *opt,
498 int *hlimit, int *tclass)
499 {
500 struct in6_pktinfo *src_info;
501 struct cmsghdr *cmsg;
502 struct ipv6_rt_hdr *rthdr;
503 struct ipv6_opt_hdr *hdr;
504 int len;
505 int err = 0;
506
507 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
508 int addr_type;
509
510 if (!CMSG_OK(msg, cmsg)) {
511 err = -EINVAL;
512 goto exit_f;
513 }
514
515 if (cmsg->cmsg_level != SOL_IPV6)
516 continue;
517
518 switch (cmsg->cmsg_type) {
519 case IPV6_PKTINFO:
520 case IPV6_2292PKTINFO:
521 {
522 struct net_device *dev = NULL;
523
524 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
525 err = -EINVAL;
526 goto exit_f;
527 }
528
529 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
530
531 if (src_info->ipi6_ifindex) {
532 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
533 return -EINVAL;
534 fl->oif = src_info->ipi6_ifindex;
535 }
536
537 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
538
539 if (fl->oif) {
540 dev = dev_get_by_index(net, fl->oif);
541 if (!dev)
542 return -ENODEV;
543 } else if (addr_type & IPV6_ADDR_LINKLOCAL)
544 return -EINVAL;
545
546 if (addr_type != IPV6_ADDR_ANY) {
547 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
548 if (!ipv6_chk_addr(net, &src_info->ipi6_addr,
549 strict ? dev : NULL, 0))
550 err = -EINVAL;
551 else
552 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
553 }
554
555 if (dev)
556 dev_put(dev);
557
558 if (err)
559 goto exit_f;
560
561 break;
562 }
563
564 case IPV6_FLOWINFO:
565 if (cmsg->cmsg_len < CMSG_LEN(4)) {
566 err = -EINVAL;
567 goto exit_f;
568 }
569
570 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
571 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
572 err = -EINVAL;
573 goto exit_f;
574 }
575 }
576 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
577 break;
578
579 case IPV6_2292HOPOPTS:
580 case IPV6_HOPOPTS:
581 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
582 err = -EINVAL;
583 goto exit_f;
584 }
585
586 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
587 len = ((hdr->hdrlen + 1) << 3);
588 if (cmsg->cmsg_len < CMSG_LEN(len)) {
589 err = -EINVAL;
590 goto exit_f;
591 }
592 if (!capable(CAP_NET_RAW)) {
593 err = -EPERM;
594 goto exit_f;
595 }
596 opt->opt_nflen += len;
597 opt->hopopt = hdr;
598 break;
599
600 case IPV6_2292DSTOPTS:
601 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
602 err = -EINVAL;
603 goto exit_f;
604 }
605
606 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
607 len = ((hdr->hdrlen + 1) << 3);
608 if (cmsg->cmsg_len < CMSG_LEN(len)) {
609 err = -EINVAL;
610 goto exit_f;
611 }
612 if (!capable(CAP_NET_RAW)) {
613 err = -EPERM;
614 goto exit_f;
615 }
616 if (opt->dst1opt) {
617 err = -EINVAL;
618 goto exit_f;
619 }
620 opt->opt_flen += len;
621 opt->dst1opt = hdr;
622 break;
623
624 case IPV6_DSTOPTS:
625 case IPV6_RTHDRDSTOPTS:
626 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
627 err = -EINVAL;
628 goto exit_f;
629 }
630
631 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
632 len = ((hdr->hdrlen + 1) << 3);
633 if (cmsg->cmsg_len < CMSG_LEN(len)) {
634 err = -EINVAL;
635 goto exit_f;
636 }
637 if (!capable(CAP_NET_RAW)) {
638 err = -EPERM;
639 goto exit_f;
640 }
641 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
642 opt->opt_flen += len;
643 opt->dst1opt = hdr;
644 } else {
645 opt->opt_nflen += len;
646 opt->dst0opt = hdr;
647 }
648 break;
649
650 case IPV6_2292RTHDR:
651 case IPV6_RTHDR:
652 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
653 err = -EINVAL;
654 goto exit_f;
655 }
656
657 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
658
659 switch (rthdr->type) {
660 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
661 case IPV6_SRCRT_TYPE_2:
662 if (rthdr->hdrlen != 2 ||
663 rthdr->segments_left != 1) {
664 err = -EINVAL;
665 goto exit_f;
666 }
667 break;
668 #endif
669 default:
670 err = -EINVAL;
671 goto exit_f;
672 }
673
674 len = ((rthdr->hdrlen + 1) << 3);
675
676 if (cmsg->cmsg_len < CMSG_LEN(len)) {
677 err = -EINVAL;
678 goto exit_f;
679 }
680
681 /* segments left must also match */
682 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
683 err = -EINVAL;
684 goto exit_f;
685 }
686
687 opt->opt_nflen += len;
688 opt->srcrt = rthdr;
689
690 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
691 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
692
693 opt->opt_nflen += dsthdrlen;
694 opt->dst0opt = opt->dst1opt;
695 opt->dst1opt = NULL;
696 opt->opt_flen -= dsthdrlen;
697 }
698
699 break;
700
701 case IPV6_2292HOPLIMIT:
702 case IPV6_HOPLIMIT:
703 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
704 err = -EINVAL;
705 goto exit_f;
706 }
707
708 *hlimit = *(int *)CMSG_DATA(cmsg);
709 if (*hlimit < -1 || *hlimit > 0xff) {
710 err = -EINVAL;
711 goto exit_f;
712 }
713
714 break;
715
716 case IPV6_TCLASS:
717 {
718 int tc;
719
720 err = -EINVAL;
721 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
722 goto exit_f;
723 }
724
725 tc = *(int *)CMSG_DATA(cmsg);
726 if (tc < -1 || tc > 0xff)
727 goto exit_f;
728
729 err = 0;
730 *tclass = tc;
731
732 break;
733 }
734 default:
735 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
736 cmsg->cmsg_type);
737 err = -EINVAL;
738 goto exit_f;
739 }
740 }
741
742 exit_f:
743 return err;
744 }
mm of the moment repository