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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / net / ipv6 / datagram.c
blob94fa6ae77cfe28c6f92c04e336cc56aedfbf4507
1 /*
2 * common UDP/RAW code
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * $Id: datagram.c,v 1.24 2002/02/01 22:01:04 davem Exp $
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 #include <linux/capability.h>
17 #include <linux/errno.h>
18 #include <linux/types.h>
19 #include <linux/kernel.h>
20 #include <linux/interrupt.h>
21 #include <linux/socket.h>
22 #include <linux/sockios.h>
23 #include <linux/in6.h>
24 #include <linux/ipv6.h>
25 #include <linux/route.h>
26
27 #include <net/ipv6.h>
28 #include <net/ndisc.h>
29 #include <net/addrconf.h>
30 #include <net/transp_v6.h>
31 #include <net/ip6_route.h>
32 #include <net/tcp_states.h>
33
34 #include <linux/errqueue.h>
35 #include <asm/uaccess.h>
36
37 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
38 {
39 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
40 struct inet_sock *inet = inet_sk(sk);
41 struct ipv6_pinfo *np = inet6_sk(sk);
42 struct in6_addr *daddr, *final_p = NULL, final;
43 struct dst_entry *dst;
44 struct flowi fl;
45 struct ip6_flowlabel *flowlabel = NULL;
46 int addr_type;
47 int err;
48
49 if (usin->sin6_family == AF_INET) {
50 if (__ipv6_only_sock(sk))
51 return -EAFNOSUPPORT;
52 err = ip4_datagram_connect(sk, uaddr, addr_len);
53 goto ipv4_connected;
54 }
55
56 if (addr_len < SIN6_LEN_RFC2133)
57 return -EINVAL;
58
59 if (usin->sin6_family != AF_INET6)
60 return -EAFNOSUPPORT;
61
62 memset(&fl, 0, sizeof(fl));
63 if (np->sndflow) {
64 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
65 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
66 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
67 if (flowlabel == NULL)
68 return -EINVAL;
69 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
70 }
71 }
72
73 addr_type = ipv6_addr_type(&usin->sin6_addr);
74
75 if (addr_type == IPV6_ADDR_ANY) {
76 /*
77 * connect to self
78 */
79 usin->sin6_addr.s6_addr[15] = 0x01;
80 }
81
82 daddr = &usin->sin6_addr;
83
84 if (addr_type == IPV6_ADDR_MAPPED) {
85 struct sockaddr_in sin;
86
87 if (__ipv6_only_sock(sk)) {
88 err = -ENETUNREACH;
89 goto out;
90 }
91 sin.sin_family = AF_INET;
92 sin.sin_addr.s_addr = daddr->s6_addr32[3];
93 sin.sin_port = usin->sin6_port;
94
95 err = ip4_datagram_connect(sk,
96 (struct sockaddr*) &sin,
97 sizeof(sin));
98
99 ipv4_connected:
100 if (err)
101 goto out;
102
103 ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr);
104
105 if (ipv6_addr_any(&np->saddr)) {
106 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff),
107 inet->saddr);
108 }
109
110 if (ipv6_addr_any(&np->rcv_saddr)) {
111 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff),
112 inet->rcv_saddr);
113 }
114 goto out;
115 }
116
117 if (addr_type&IPV6_ADDR_LINKLOCAL) {
118 if (addr_len >= sizeof(struct sockaddr_in6) &&
119 usin->sin6_scope_id) {
120 if (sk->sk_bound_dev_if &&
121 sk->sk_bound_dev_if != usin->sin6_scope_id) {
122 err = -EINVAL;
123 goto out;
124 }
125 sk->sk_bound_dev_if = usin->sin6_scope_id;
126 }
127
128 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
129 sk->sk_bound_dev_if = np->mcast_oif;
130
131 /* Connect to link-local address requires an interface */
132 if (!sk->sk_bound_dev_if) {
133 err = -EINVAL;
134 goto out;
135 }
136 }
137
138 ipv6_addr_copy(&np->daddr, daddr);
139 np->flow_label = fl.fl6_flowlabel;
140
141 inet->dport = usin->sin6_port;
142
143 /*
144 * Check for a route to destination an obtain the
145 * destination cache for it.
146 */
147
148 fl.proto = sk->sk_protocol;
149 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
150 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
151 fl.oif = sk->sk_bound_dev_if;
152 fl.fl_ip_dport = inet->dport;
153 fl.fl_ip_sport = inet->sport;
154
155 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
156 fl.oif = np->mcast_oif;
157
158 security_sk_classify_flow(sk, &fl);
159
160 if (flowlabel) {
161 if (flowlabel->opt && flowlabel->opt->srcrt) {
162 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
163 ipv6_addr_copy(&final, &fl.fl6_dst);
164 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
165 final_p = &final;
166 }
167 } else if (np->opt && np->opt->srcrt) {
168 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
169 ipv6_addr_copy(&final, &fl.fl6_dst);
170 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
171 final_p = &final;
172 }
173
174 err = ip6_dst_lookup(sk, &dst, &fl);
175 if (err)
176 goto out;
177 if (final_p)
178 ipv6_addr_copy(&fl.fl6_dst, final_p);
179
180 if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) {
181 if (err == -EREMOTE)
182 err = ip6_dst_blackhole(sk, &dst, &fl);
183 if (err < 0)
184 goto out;
185 }
186
187 /* source address lookup done in ip6_dst_lookup */
188
189 if (ipv6_addr_any(&np->saddr))
190 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
191
192 if (ipv6_addr_any(&np->rcv_saddr)) {
193 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
194 inet->rcv_saddr = LOOPBACK4_IPV6;
195 }
196
197 ip6_dst_store(sk, dst,
198 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
199 &np->daddr : NULL,
200 #ifdef CONFIG_IPV6_SUBTREES
201 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
202 &np->saddr :
203 #endif
204 NULL);
205
206 sk->sk_state = TCP_ESTABLISHED;
207 out:
208 fl6_sock_release(flowlabel);
209 return err;
210 }
211
212 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
213 __be16 port, u32 info, u8 *payload)
214 {
215 struct ipv6_pinfo *np = inet6_sk(sk);
216 struct icmp6hdr *icmph = icmp6_hdr(skb);
217 struct sock_exterr_skb *serr;
218
219 if (!np->recverr)
220 return;
221
222 skb = skb_clone(skb, GFP_ATOMIC);
223 if (!skb)
224 return;
225
226 serr = SKB_EXT_ERR(skb);
227 serr->ee.ee_errno = err;
228 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
229 serr->ee.ee_type = icmph->icmp6_type;
230 serr->ee.ee_code = icmph->icmp6_code;
231 serr->ee.ee_pad = 0;
232 serr->ee.ee_info = info;
233 serr->ee.ee_data = 0;
234 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
235 skb_network_header(skb);
236 serr->port = port;
237
238 __skb_pull(skb, payload - skb->data);
239 skb_reset_transport_header(skb);
240
241 if (sock_queue_err_skb(sk, skb))
242 kfree_skb(skb);
243 }
244
245 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
246 {
247 struct ipv6_pinfo *np = inet6_sk(sk);
248 struct sock_exterr_skb *serr;
249 struct ipv6hdr *iph;
250 struct sk_buff *skb;
251
252 if (!np->recverr)
253 return;
254
255 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
256 if (!skb)
257 return;
258
259 skb_put(skb, sizeof(struct ipv6hdr));
260 skb_reset_network_header(skb);
261 iph = ipv6_hdr(skb);
262 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
263
264 serr = SKB_EXT_ERR(skb);
265 serr->ee.ee_errno = err;
266 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
267 serr->ee.ee_type = 0;
268 serr->ee.ee_code = 0;
269 serr->ee.ee_pad = 0;
270 serr->ee.ee_info = info;
271 serr->ee.ee_data = 0;
272 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
273 serr->port = fl->fl_ip_dport;
274
275 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
276 skb_reset_transport_header(skb);
277
278 if (sock_queue_err_skb(sk, skb))
279 kfree_skb(skb);
280 }
281
282 /*
283 * Handle MSG_ERRQUEUE
284 */
285 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
286 {
287 struct ipv6_pinfo *np = inet6_sk(sk);
288 struct sock_exterr_skb *serr;
289 struct sk_buff *skb, *skb2;
290 struct sockaddr_in6 *sin;
291 struct {
292 struct sock_extended_err ee;
293 struct sockaddr_in6 offender;
294 } errhdr;
295 int err;
296 int copied;
297
298 err = -EAGAIN;
299 skb = skb_dequeue(&sk->sk_error_queue);
300 if (skb == NULL)
301 goto out;
302
303 copied = skb->len;
304 if (copied > len) {
305 msg->msg_flags |= MSG_TRUNC;
306 copied = len;
307 }
308 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
309 if (err)
310 goto out_free_skb;
311
312 sock_recv_timestamp(msg, sk, skb);
313
314 serr = SKB_EXT_ERR(skb);
315
316 sin = (struct sockaddr_in6 *)msg->msg_name;
317 if (sin) {
318 const unsigned char *nh = skb_network_header(skb);
319 sin->sin6_family = AF_INET6;
320 sin->sin6_flowinfo = 0;
321 sin->sin6_port = serr->port;
322 sin->sin6_scope_id = 0;
323 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
324 ipv6_addr_copy(&sin->sin6_addr,
325 (struct in6_addr *)(nh + serr->addr_offset));
326 if (np->sndflow)
327 sin->sin6_flowinfo =
328 (*(__be32 *)(nh + serr->addr_offset - 24) &
329 IPV6_FLOWINFO_MASK);
330 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
331 sin->sin6_scope_id = IP6CB(skb)->iif;
332 } else {
333 ipv6_addr_set(&sin->sin6_addr, 0, 0,
334 htonl(0xffff),
335 *(__be32 *)(nh + serr->addr_offset));
336 }
337 }
338
339 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
340 sin = &errhdr.offender;
341 sin->sin6_family = AF_UNSPEC;
342 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
343 sin->sin6_family = AF_INET6;
344 sin->sin6_flowinfo = 0;
345 sin->sin6_scope_id = 0;
346 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
347 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
348 if (np->rxopt.all)
349 datagram_recv_ctl(sk, msg, skb);
350 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
351 sin->sin6_scope_id = IP6CB(skb)->iif;
352 } else {
353 struct inet_sock *inet = inet_sk(sk);
354
355 ipv6_addr_set(&sin->sin6_addr, 0, 0,
356 htonl(0xffff), ip_hdr(skb)->saddr);
357 if (inet->cmsg_flags)
358 ip_cmsg_recv(msg, skb);
359 }
360 }
361
362 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
363
364 /* Now we could try to dump offended packet options */
365
366 msg->msg_flags |= MSG_ERRQUEUE;
367 err = copied;
368
369 /* Reset and regenerate socket error */
370 spin_lock_bh(&sk->sk_error_queue.lock);
371 sk->sk_err = 0;
372 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
373 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
374 spin_unlock_bh(&sk->sk_error_queue.lock);
375 sk->sk_error_report(sk);
376 } else {
377 spin_unlock_bh(&sk->sk_error_queue.lock);
378 }
379
380 out_free_skb:
381 kfree_skb(skb);
382 out:
383 return err;
384 }
385
386
387
388 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
389 {
390 struct ipv6_pinfo *np = inet6_sk(sk);
391 struct inet6_skb_parm *opt = IP6CB(skb);
392 unsigned char *nh = skb_network_header(skb);
393
394 if (np->rxopt.bits.rxinfo) {
395 struct in6_pktinfo src_info;
396
397 src_info.ipi6_ifindex = opt->iif;
398 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
399 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
400 }
401
402 if (np->rxopt.bits.rxhlim) {
403 int hlim = ipv6_hdr(skb)->hop_limit;
404 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
405 }
406
407 if (np->rxopt.bits.rxtclass) {
408 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
409 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
410 }
411
412 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
413 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
414 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
415 }
416
417 /* HbH is allowed only once */
418 if (np->rxopt.bits.hopopts && opt->hop) {
419 u8 *ptr = nh + opt->hop;
420 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
421 }
422
423 if (opt->lastopt &&
424 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
425 /*
426 * Silly enough, but we need to reparse in order to
427 * report extension headers (except for HbH)
428 * in order.
429 *
430 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
431 * (and WILL NOT be) defined because
432 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
433 */
434 unsigned int off = sizeof(struct ipv6hdr);
435 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
436
437 while (off <= opt->lastopt) {
438 unsigned len;
439 u8 *ptr = nh + off;
440
441 switch(nexthdr) {
442 case IPPROTO_DSTOPTS:
443 nexthdr = ptr[0];
444 len = (ptr[1] + 1) << 3;
445 if (np->rxopt.bits.dstopts)
446 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
447 break;
448 case IPPROTO_ROUTING:
449 nexthdr = ptr[0];
450 len = (ptr[1] + 1) << 3;
451 if (np->rxopt.bits.srcrt)
452 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
453 break;
454 case IPPROTO_AH:
455 nexthdr = ptr[0];
456 len = (ptr[1] + 2) << 2;
457 break;
458 default:
459 nexthdr = ptr[0];
460 len = (ptr[1] + 1) << 3;
461 break;
462 }
463
464 off += len;
465 }
466 }
467
468 /* socket options in old style */
469 if (np->rxopt.bits.rxoinfo) {
470 struct in6_pktinfo src_info;
471
472 src_info.ipi6_ifindex = opt->iif;
473 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
474 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
475 }
476 if (np->rxopt.bits.rxohlim) {
477 int hlim = ipv6_hdr(skb)->hop_limit;
478 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
479 }
480 if (np->rxopt.bits.ohopopts && opt->hop) {
481 u8 *ptr = nh + opt->hop;
482 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
483 }
484 if (np->rxopt.bits.odstopts && opt->dst0) {
485 u8 *ptr = nh + opt->dst0;
486 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
487 }
488 if (np->rxopt.bits.osrcrt && opt->srcrt) {
489 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
490 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
491 }
492 if (np->rxopt.bits.odstopts && opt->dst1) {
493 u8 *ptr = nh + opt->dst1;
494 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
495 }
496 return 0;
497 }
498
499 int datagram_send_ctl(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 struct net_device *dev = NULL;
513
514 if (!CMSG_OK(msg, cmsg)) {
515 err = -EINVAL;
516 goto exit_f;
517 }
518
519 if (cmsg->cmsg_level != SOL_IPV6)
520 continue;
521
522 switch (cmsg->cmsg_type) {
523 case IPV6_PKTINFO:
524 case IPV6_2292PKTINFO:
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 if (addr_type == IPV6_ADDR_ANY)
541 break;
542
543 if (addr_type & IPV6_ADDR_LINKLOCAL) {
544 if (!src_info->ipi6_ifindex)
545 return -EINVAL;
546 else {
547 dev = dev_get_by_index(&init_net, src_info->ipi6_ifindex);
548 if (!dev)
549 return -ENODEV;
550 }
551 }
552 if (!ipv6_chk_addr(&init_net, &src_info->ipi6_addr,
553 dev, 0)) {
554 if (dev)
555 dev_put(dev);
556 err = -EINVAL;
557 goto exit_f;
558 }
559 if (dev)
560 dev_put(dev);
561
562 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
563 break;
564
565 case IPV6_FLOWINFO:
566 if (cmsg->cmsg_len < CMSG_LEN(4)) {
567 err = -EINVAL;
568 goto exit_f;
569 }
570
571 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
572 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
573 err = -EINVAL;
574 goto exit_f;
575 }
576 }
577 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
578 break;
579
580 case IPV6_2292HOPOPTS:
581 case IPV6_HOPOPTS:
582 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
583 err = -EINVAL;
584 goto exit_f;
585 }
586
587 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
588 len = ((hdr->hdrlen + 1) << 3);
589 if (cmsg->cmsg_len < CMSG_LEN(len)) {
590 err = -EINVAL;
591 goto exit_f;
592 }
593 if (!capable(CAP_NET_RAW)) {
594 err = -EPERM;
595 goto exit_f;
596 }
597 opt->opt_nflen += len;
598 opt->hopopt = hdr;
599 break;
600
601 case IPV6_2292DSTOPTS:
602 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
603 err = -EINVAL;
604 goto exit_f;
605 }
606
607 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
608 len = ((hdr->hdrlen + 1) << 3);
609 if (cmsg->cmsg_len < CMSG_LEN(len)) {
610 err = -EINVAL;
611 goto exit_f;
612 }
613 if (!capable(CAP_NET_RAW)) {
614 err = -EPERM;
615 goto exit_f;
616 }
617 if (opt->dst1opt) {
618 err = -EINVAL;
619 goto exit_f;
620 }
621 opt->opt_flen += len;
622 opt->dst1opt = hdr;
623 break;
624
625 case IPV6_DSTOPTS:
626 case IPV6_RTHDRDSTOPTS:
627 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
628 err = -EINVAL;
629 goto exit_f;
630 }
631
632 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
633 len = ((hdr->hdrlen + 1) << 3);
634 if (cmsg->cmsg_len < CMSG_LEN(len)) {
635 err = -EINVAL;
636 goto exit_f;
637 }
638 if (!capable(CAP_NET_RAW)) {
639 err = -EPERM;
640 goto exit_f;
641 }
642 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
643 opt->opt_flen += len;
644 opt->dst1opt = hdr;
645 } else {
646 opt->opt_nflen += len;
647 opt->dst0opt = hdr;
648 }
649 break;
650
651 case IPV6_2292RTHDR:
652 case IPV6_RTHDR:
653 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
654 err = -EINVAL;
655 goto exit_f;
656 }
657
658 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
659
660 switch (rthdr->type) {
661 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
662 case IPV6_SRCRT_TYPE_2:
663 break;
664 #endif
665 default:
666 err = -EINVAL;
667 goto exit_f;
668 }
669
670 len = ((rthdr->hdrlen + 1) << 3);
671
672 if (cmsg->cmsg_len < CMSG_LEN(len)) {
673 err = -EINVAL;
674 goto exit_f;
675 }
676
677 /* segments left must also match */
678 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
679 err = -EINVAL;
680 goto exit_f;
681 }
682
683 opt->opt_nflen += len;
684 opt->srcrt = rthdr;
685
686 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
687 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
688
689 opt->opt_nflen += dsthdrlen;
690 opt->dst0opt = opt->dst1opt;
691 opt->dst1opt = NULL;
692 opt->opt_flen -= dsthdrlen;
693 }
694
695 break;
696
697 case IPV6_2292HOPLIMIT:
698 case IPV6_HOPLIMIT:
699 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
700 err = -EINVAL;
701 goto exit_f;
702 }
703
704 *hlimit = *(int *)CMSG_DATA(cmsg);
705 break;
706
707 case IPV6_TCLASS:
708 {
709 int tc;
710
711 err = -EINVAL;
712 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
713 goto exit_f;
714 }
715
716 tc = *(int *)CMSG_DATA(cmsg);
717 if (tc < -1 || tc > 0xff)
718 goto exit_f;
719
720 err = 0;
721 *tclass = tc;
722
723 break;
724 }
725 default:
726 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
727 cmsg->cmsg_type);
728 err = -EINVAL;
729 break;
730 }
731 }
732
733 exit_f:
734 return err;
735 }
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