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hwmon: (adt7470) Add documentation
[linux-2.6/mini2440.git] / net / ipv6 / datagram.c
blob410046a8cc915f5ea2f56a4c7b6c105f58d1903d
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(&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 if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 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->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(&sin->sin6_addr, 0, 0,
332 htonl(0xffff),
333 *(__be32 *)(nh + serr->addr_offset));
334 }
335 }
336
337 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
338 sin = &errhdr.offender;
339 sin->sin6_family = AF_UNSPEC;
340 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
341 sin->sin6_family = AF_INET6;
342 sin->sin6_flowinfo = 0;
343 sin->sin6_scope_id = 0;
344 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
345 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
346 if (np->rxopt.all)
347 datagram_recv_ctl(sk, msg, skb);
348 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
349 sin->sin6_scope_id = IP6CB(skb)->iif;
350 } else {
351 struct inet_sock *inet = inet_sk(sk);
352
353 ipv6_addr_set(&sin->sin6_addr, 0, 0,
354 htonl(0xffff), ip_hdr(skb)->saddr);
355 if (inet->cmsg_flags)
356 ip_cmsg_recv(msg, skb);
357 }
358 }
359
360 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
361
362 /* Now we could try to dump offended packet options */
363
364 msg->msg_flags |= MSG_ERRQUEUE;
365 err = copied;
366
367 /* Reset and regenerate socket error */
368 spin_lock_bh(&sk->sk_error_queue.lock);
369 sk->sk_err = 0;
370 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
371 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
372 spin_unlock_bh(&sk->sk_error_queue.lock);
373 sk->sk_error_report(sk);
374 } else {
375 spin_unlock_bh(&sk->sk_error_queue.lock);
376 }
377
378 out_free_skb:
379 kfree_skb(skb);
380 out:
381 return err;
382 }
383
384
385
386 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
387 {
388 struct ipv6_pinfo *np = inet6_sk(sk);
389 struct inet6_skb_parm *opt = IP6CB(skb);
390 unsigned char *nh = skb_network_header(skb);
391
392 if (np->rxopt.bits.rxinfo) {
393 struct in6_pktinfo src_info;
394
395 src_info.ipi6_ifindex = opt->iif;
396 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
397 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
398 }
399
400 if (np->rxopt.bits.rxhlim) {
401 int hlim = ipv6_hdr(skb)->hop_limit;
402 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
403 }
404
405 if (np->rxopt.bits.rxtclass) {
406 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
407 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
408 }
409
410 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
411 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
412 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
413 }
414
415 /* HbH is allowed only once */
416 if (np->rxopt.bits.hopopts && opt->hop) {
417 u8 *ptr = nh + opt->hop;
418 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
419 }
420
421 if (opt->lastopt &&
422 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
423 /*
424 * Silly enough, but we need to reparse in order to
425 * report extension headers (except for HbH)
426 * in order.
427 *
428 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
429 * (and WILL NOT be) defined because
430 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
431 */
432 unsigned int off = sizeof(struct ipv6hdr);
433 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
434
435 while (off <= opt->lastopt) {
436 unsigned len;
437 u8 *ptr = nh + off;
438
439 switch(nexthdr) {
440 case IPPROTO_DSTOPTS:
441 nexthdr = ptr[0];
442 len = (ptr[1] + 1) << 3;
443 if (np->rxopt.bits.dstopts)
444 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
445 break;
446 case IPPROTO_ROUTING:
447 nexthdr = ptr[0];
448 len = (ptr[1] + 1) << 3;
449 if (np->rxopt.bits.srcrt)
450 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
451 break;
452 case IPPROTO_AH:
453 nexthdr = ptr[0];
454 len = (ptr[1] + 2) << 2;
455 break;
456 default:
457 nexthdr = ptr[0];
458 len = (ptr[1] + 1) << 3;
459 break;
460 }
461
462 off += len;
463 }
464 }
465
466 /* socket options in old style */
467 if (np->rxopt.bits.rxoinfo) {
468 struct in6_pktinfo src_info;
469
470 src_info.ipi6_ifindex = opt->iif;
471 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
472 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
473 }
474 if (np->rxopt.bits.rxohlim) {
475 int hlim = ipv6_hdr(skb)->hop_limit;
476 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
477 }
478 if (np->rxopt.bits.ohopopts && opt->hop) {
479 u8 *ptr = nh + opt->hop;
480 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
481 }
482 if (np->rxopt.bits.odstopts && opt->dst0) {
483 u8 *ptr = nh + opt->dst0;
484 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
485 }
486 if (np->rxopt.bits.osrcrt && opt->srcrt) {
487 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
488 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
489 }
490 if (np->rxopt.bits.odstopts && opt->dst1) {
491 u8 *ptr = nh + opt->dst1;
492 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
493 }
494 return 0;
495 }
496
497 int datagram_send_ctl(struct net *net,
498 struct msghdr *msg, struct flowi *fl,
499 struct ipv6_txoptions *opt,
500 int *hlimit, int *tclass)
501 {
502 struct in6_pktinfo *src_info;
503 struct cmsghdr *cmsg;
504 struct ipv6_rt_hdr *rthdr;
505 struct ipv6_opt_hdr *hdr;
506 int len;
507 int err = 0;
508
509 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
510 int addr_type;
511
512 if (!CMSG_OK(msg, cmsg)) {
513 err = -EINVAL;
514 goto exit_f;
515 }
516
517 if (cmsg->cmsg_level != SOL_IPV6)
518 continue;
519
520 switch (cmsg->cmsg_type) {
521 case IPV6_PKTINFO:
522 case IPV6_2292PKTINFO:
523 {
524 struct net_device *dev = NULL;
525
526 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
527 err = -EINVAL;
528 goto exit_f;
529 }
530
531 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
532
533 if (src_info->ipi6_ifindex) {
534 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
535 return -EINVAL;
536 fl->oif = src_info->ipi6_ifindex;
537 }
538
539 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
540
541 if (fl->oif) {
542 dev = dev_get_by_index(net, fl->oif);
543 if (!dev)
544 return -ENODEV;
545 } else if (addr_type & IPV6_ADDR_LINKLOCAL)
546 return -EINVAL;
547
548 if (addr_type != IPV6_ADDR_ANY) {
549 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
550 if (!ipv6_chk_addr(net, &src_info->ipi6_addr,
551 strict ? dev : NULL, 0))
552 err = -EINVAL;
553 else
554 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
555 }
556
557 if (dev)
558 dev_put(dev);
559
560 if (err)
561 goto exit_f;
562
563 break;
564 }
565
566 case IPV6_FLOWINFO:
567 if (cmsg->cmsg_len < CMSG_LEN(4)) {
568 err = -EINVAL;
569 goto exit_f;
570 }
571
572 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
573 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
574 err = -EINVAL;
575 goto exit_f;
576 }
577 }
578 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
579 break;
580
581 case IPV6_2292HOPOPTS:
582 case IPV6_HOPOPTS:
583 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
584 err = -EINVAL;
585 goto exit_f;
586 }
587
588 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
589 len = ((hdr->hdrlen + 1) << 3);
590 if (cmsg->cmsg_len < CMSG_LEN(len)) {
591 err = -EINVAL;
592 goto exit_f;
593 }
594 if (!capable(CAP_NET_RAW)) {
595 err = -EPERM;
596 goto exit_f;
597 }
598 opt->opt_nflen += len;
599 opt->hopopt = hdr;
600 break;
601
602 case IPV6_2292DSTOPTS:
603 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
604 err = -EINVAL;
605 goto exit_f;
606 }
607
608 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
609 len = ((hdr->hdrlen + 1) << 3);
610 if (cmsg->cmsg_len < CMSG_LEN(len)) {
611 err = -EINVAL;
612 goto exit_f;
613 }
614 if (!capable(CAP_NET_RAW)) {
615 err = -EPERM;
616 goto exit_f;
617 }
618 if (opt->dst1opt) {
619 err = -EINVAL;
620 goto exit_f;
621 }
622 opt->opt_flen += len;
623 opt->dst1opt = hdr;
624 break;
625
626 case IPV6_DSTOPTS:
627 case IPV6_RTHDRDSTOPTS:
628 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
629 err = -EINVAL;
630 goto exit_f;
631 }
632
633 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
634 len = ((hdr->hdrlen + 1) << 3);
635 if (cmsg->cmsg_len < CMSG_LEN(len)) {
636 err = -EINVAL;
637 goto exit_f;
638 }
639 if (!capable(CAP_NET_RAW)) {
640 err = -EPERM;
641 goto exit_f;
642 }
643 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
644 opt->opt_flen += len;
645 opt->dst1opt = hdr;
646 } else {
647 opt->opt_nflen += len;
648 opt->dst0opt = hdr;
649 }
650 break;
651
652 case IPV6_2292RTHDR:
653 case IPV6_RTHDR:
654 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
655 err = -EINVAL;
656 goto exit_f;
657 }
658
659 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
660
661 switch (rthdr->type) {
662 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
663 case IPV6_SRCRT_TYPE_2:
664 break;
665 #endif
666 default:
667 err = -EINVAL;
668 goto exit_f;
669 }
670
671 len = ((rthdr->hdrlen + 1) << 3);
672
673 if (cmsg->cmsg_len < CMSG_LEN(len)) {
674 err = -EINVAL;
675 goto exit_f;
676 }
677
678 /* segments left must also match */
679 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
680 err = -EINVAL;
681 goto exit_f;
682 }
683
684 opt->opt_nflen += len;
685 opt->srcrt = rthdr;
686
687 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
688 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
689
690 opt->opt_nflen += dsthdrlen;
691 opt->dst0opt = opt->dst1opt;
692 opt->dst1opt = NULL;
693 opt->opt_flen -= dsthdrlen;
694 }
695
696 break;
697
698 case IPV6_2292HOPLIMIT:
699 case IPV6_HOPLIMIT:
700 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
701 err = -EINVAL;
702 goto exit_f;
703 }
704
705 *hlimit = *(int *)CMSG_DATA(cmsg);
706 if (*hlimit < -1 || *hlimit > 0xff) {
707 err = -EINVAL;
708 goto exit_f;
709 }
710
711 break;
712
713 case IPV6_TCLASS:
714 {
715 int tc;
716
717 err = -EINVAL;
718 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
719 goto exit_f;
720 }
721
722 tc = *(int *)CMSG_DATA(cmsg);
723 if (tc < -1 || tc > 0xff)
724 goto exit_f;
725
726 err = 0;
727 *tclass = tc;
728
729 break;
730 }
731 default:
732 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
733 cmsg->cmsg_type);
734 err = -EINVAL;
735 goto exit_f;
736 }
737 }
738
739 exit_f:
740 return err;
741 }
Support for the Chinese Samsung S3C2440 based development boards