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RT-AC66 3.0.0.4.374.130 core
[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / net / ipv6 / datagram.c
blobdf5d3f8f70ac338a60763f907e3bb4d3e433cedc
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 static inline int ipv6_mapped_addr_any(const struct in6_addr *a)
38 {
39 return (ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0));
40 }
41
42 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
43 {
44 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
45 struct inet_sock *inet = inet_sk(sk);
46 struct ipv6_pinfo *np = inet6_sk(sk);
47 struct in6_addr *daddr, *final_p = NULL, final;
48 struct dst_entry *dst;
49 struct flowi fl;
50 struct ip6_flowlabel *flowlabel = NULL;
51 int addr_type;
52 int err;
53
54 if (usin->sin6_family == AF_INET) {
55 if (__ipv6_only_sock(sk))
56 return -EAFNOSUPPORT;
57 err = ip4_datagram_connect(sk, uaddr, addr_len);
58 goto ipv4_connected;
59 }
60
61 if (addr_len < SIN6_LEN_RFC2133)
62 return -EINVAL;
63
64 if (usin->sin6_family != AF_INET6)
65 return -EAFNOSUPPORT;
66
67 memset(&fl, 0, sizeof(fl));
68 if (np->sndflow) {
69 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
70 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
71 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
72 if (flowlabel == NULL)
73 return -EINVAL;
74 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
75 }
76 }
77
78 addr_type = ipv6_addr_type(&usin->sin6_addr);
79
80 if (addr_type == IPV6_ADDR_ANY) {
81 /*
82 * connect to self
83 */
84 usin->sin6_addr.s6_addr[15] = 0x01;
85 }
86
87 daddr = &usin->sin6_addr;
88
89 if (addr_type == IPV6_ADDR_MAPPED) {
90 struct sockaddr_in sin;
91
92 if (__ipv6_only_sock(sk)) {
93 err = -ENETUNREACH;
94 goto out;
95 }
96 sin.sin_family = AF_INET;
97 sin.sin_addr.s_addr = daddr->s6_addr32[3];
98 sin.sin_port = usin->sin6_port;
99
100 err = ip4_datagram_connect(sk,
101 (struct sockaddr*) &sin,
102 sizeof(sin));
103
104 ipv4_connected:
105 if (err)
106 goto out;
107
108 ipv6_addr_set_v4mapped(inet->daddr, &np->daddr);
109
110 if (ipv6_addr_any(&np->saddr) ||
111 ipv6_mapped_addr_any(&np->saddr))
112 ipv6_addr_set_v4mapped(inet->saddr, &np->saddr);
113
114 if (ipv6_addr_any(&np->rcv_saddr) ||
115 ipv6_mapped_addr_any(&np->rcv_saddr))
116 ipv6_addr_set_v4mapped(inet->rcv_saddr, &np->rcv_saddr);
117
118 goto out;
119 }
120
121 if (addr_type&IPV6_ADDR_LINKLOCAL) {
122 if (addr_len >= sizeof(struct sockaddr_in6) &&
123 usin->sin6_scope_id) {
124 if (sk->sk_bound_dev_if &&
125 sk->sk_bound_dev_if != usin->sin6_scope_id) {
126 err = -EINVAL;
127 goto out;
128 }
129 sk->sk_bound_dev_if = usin->sin6_scope_id;
130 if (!sk->sk_bound_dev_if &&
131 (addr_type & IPV6_ADDR_MULTICAST))
132 fl.oif = np->mcast_oif;
133 }
134
135 /* Connect to link-local address requires an interface */
136 if (!sk->sk_bound_dev_if) {
137 err = -EINVAL;
138 goto out;
139 }
140 }
141
142 ipv6_addr_copy(&np->daddr, daddr);
143 np->flow_label = fl.fl6_flowlabel;
144
145 inet->dport = usin->sin6_port;
146
147 /*
148 * Check for a route to destination an obtain the
149 * destination cache for it.
150 */
151
152 fl.proto = sk->sk_protocol;
153 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
154 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
155 fl.oif = sk->sk_bound_dev_if;
156 fl.fl_ip_dport = inet->dport;
157 fl.fl_ip_sport = inet->sport;
158
159 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
160 fl.oif = np->mcast_oif;
161
162 security_sk_classify_flow(sk, &fl);
163
164 if (flowlabel) {
165 if (flowlabel->opt && flowlabel->opt->srcrt) {
166 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->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 } else if (np->opt && np->opt->srcrt) {
172 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
173 ipv6_addr_copy(&final, &fl.fl6_dst);
174 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
175 final_p = &final;
176 }
177
178 err = ip6_dst_lookup(sk, &dst, &fl);
179 if (err)
180 goto out;
181 if (final_p)
182 ipv6_addr_copy(&fl.fl6_dst, final_p);
183
184 if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) {
185 if (err == -EREMOTE)
186 err = ip6_dst_blackhole(sk, &dst, &fl);
187 if (err < 0)
188 goto out;
189 }
190
191 /* source address lookup done in ip6_dst_lookup */
192
193 if (ipv6_addr_any(&np->saddr))
194 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
195
196 if (ipv6_addr_any(&np->rcv_saddr)) {
197 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
198 inet->rcv_saddr = LOOPBACK4_IPV6;
199 }
200
201 ip6_dst_store(sk, dst,
202 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
203 &np->daddr : NULL,
204 #ifdef CONFIG_IPV6_SUBTREES
205 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
206 &np->saddr :
207 #endif
208 NULL);
209
210 sk->sk_state = TCP_ESTABLISHED;
211 out:
212 fl6_sock_release(flowlabel);
213 return err;
214 }
215
216 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
217 __be16 port, u32 info, u8 *payload)
218 {
219 struct ipv6_pinfo *np = inet6_sk(sk);
220 struct icmp6hdr *icmph = icmp6_hdr(skb);
221 struct sock_exterr_skb *serr;
222
223 if (!np->recverr)
224 return;
225
226 skb = skb_clone(skb, GFP_ATOMIC);
227 if (!skb)
228 return;
229
230 serr = SKB_EXT_ERR(skb);
231 serr->ee.ee_errno = err;
232 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
233 serr->ee.ee_type = icmph->icmp6_type;
234 serr->ee.ee_code = icmph->icmp6_code;
235 serr->ee.ee_pad = 0;
236 serr->ee.ee_info = info;
237 serr->ee.ee_data = 0;
238 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
239 skb_network_header(skb);
240 serr->port = port;
241
242 __skb_pull(skb, payload - skb->data);
243 skb_reset_transport_header(skb);
244
245 if (sock_queue_err_skb(sk, skb))
246 kfree_skb(skb);
247 }
248
249 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
250 {
251 struct ipv6_pinfo *np = inet6_sk(sk);
252 struct sock_exterr_skb *serr;
253 struct ipv6hdr *iph;
254 struct sk_buff *skb;
255
256 if (!np->recverr)
257 return;
258
259 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
260 if (!skb)
261 return;
262
263 skb_put(skb, sizeof(struct ipv6hdr));
264 skb_reset_network_header(skb);
265 iph = ipv6_hdr(skb);
266 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
267
268 serr = SKB_EXT_ERR(skb);
269 serr->ee.ee_errno = err;
270 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
271 serr->ee.ee_type = 0;
272 serr->ee.ee_code = 0;
273 serr->ee.ee_pad = 0;
274 serr->ee.ee_info = info;
275 serr->ee.ee_data = 0;
276 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
277 serr->port = fl->fl_ip_dport;
278
279 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
280 skb_reset_transport_header(skb);
281
282 if (sock_queue_err_skb(sk, skb))
283 kfree_skb(skb);
284 }
285
286 /*
287 * Handle MSG_ERRQUEUE
288 */
289 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
290 {
291 struct ipv6_pinfo *np = inet6_sk(sk);
292 struct sock_exterr_skb *serr;
293 struct sk_buff *skb, *skb2;
294 struct sockaddr_in6 *sin;
295 struct {
296 struct sock_extended_err ee;
297 struct sockaddr_in6 offender;
298 } errhdr;
299 int err;
300 int copied;
301
302 err = -EAGAIN;
303 skb = skb_dequeue(&sk->sk_error_queue);
304 if (skb == NULL)
305 goto out;
306
307 copied = skb->len;
308 if (copied > len) {
309 msg->msg_flags |= MSG_TRUNC;
310 copied = len;
311 }
312 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
313 if (err)
314 goto out_free_skb;
315
316 sock_recv_timestamp(msg, sk, skb);
317
318 serr = SKB_EXT_ERR(skb);
319
320 sin = (struct sockaddr_in6 *)msg->msg_name;
321 if (sin) {
322 const unsigned char *nh = skb_network_header(skb);
323 sin->sin6_family = AF_INET6;
324 sin->sin6_flowinfo = 0;
325 sin->sin6_port = serr->port;
326 sin->sin6_scope_id = 0;
327 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
328 ipv6_addr_copy(&sin->sin6_addr,
329 (struct in6_addr *)(nh + serr->addr_offset));
330 if (np->sndflow)
331 sin->sin6_flowinfo =
332 (*(__be32 *)(nh + serr->addr_offset - 24) &
333 IPV6_FLOWINFO_MASK);
334 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
335 sin->sin6_scope_id = IP6CB(skb)->iif;
336 } else {
337 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
338 &sin->sin6_addr);
339 }
340 }
341
342 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
343 sin = &errhdr.offender;
344 sin->sin6_family = AF_UNSPEC;
345 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
346 sin->sin6_family = AF_INET6;
347 sin->sin6_flowinfo = 0;
348 sin->sin6_scope_id = 0;
349 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
350 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
351 if (np->rxopt.all)
352 datagram_recv_ctl(sk, msg, skb);
353 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
354 sin->sin6_scope_id = IP6CB(skb)->iif;
355 } else {
356 struct inet_sock *inet = inet_sk(sk);
357
358 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
359 &sin->sin6_addr);
360 if (inet->cmsg_flags)
361 ip_cmsg_recv(msg, skb);
362 }
363 }
364
365 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
366
367 /* Now we could try to dump offended packet options */
368
369 msg->msg_flags |= MSG_ERRQUEUE;
370 err = copied;
371
372 /* Reset and regenerate socket error */
373 spin_lock_bh(&sk->sk_error_queue.lock);
374 sk->sk_err = 0;
375 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
376 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
377 spin_unlock_bh(&sk->sk_error_queue.lock);
378 sk->sk_error_report(sk);
379 } else {
380 spin_unlock_bh(&sk->sk_error_queue.lock);
381 }
382
383 out_free_skb:
384 kfree_skb(skb);
385 out:
386 return err;
387 }
388
389
390
391 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
392 {
393 struct ipv6_pinfo *np = inet6_sk(sk);
394 struct inet6_skb_parm *opt = IP6CB(skb);
395 unsigned char *nh = skb_network_header(skb);
396
397 if (np->rxopt.bits.rxinfo) {
398 struct in6_pktinfo src_info;
399
400 src_info.ipi6_ifindex = opt->iif;
401 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
402 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
403 }
404
405 if (np->rxopt.bits.rxhlim) {
406 int hlim = ipv6_hdr(skb)->hop_limit;
407 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
408 }
409
410 if (np->rxopt.bits.rxtclass) {
411 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
412 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
413 }
414
415 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
416 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
417 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
418 }
419
420 /* HbH is allowed only once */
421 if (np->rxopt.bits.hopopts && opt->hop) {
422 u8 *ptr = nh + opt->hop;
423 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
424 }
425
426 if (opt->lastopt &&
427 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
428 /*
429 * Silly enough, but we need to reparse in order to
430 * report extension headers (except for HbH)
431 * in order.
432 *
433 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
434 * (and WILL NOT be) defined because
435 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
436 */
437 unsigned int off = sizeof(struct ipv6hdr);
438 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
439
440 while (off <= opt->lastopt) {
441 unsigned len;
442 u8 *ptr = nh + off;
443
444 switch(nexthdr) {
445 case IPPROTO_DSTOPTS:
446 nexthdr = ptr[0];
447 len = (ptr[1] + 1) << 3;
448 if (np->rxopt.bits.dstopts)
449 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
450 break;
451 case IPPROTO_ROUTING:
452 nexthdr = ptr[0];
453 len = (ptr[1] + 1) << 3;
454 if (np->rxopt.bits.srcrt)
455 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
456 break;
457 case IPPROTO_AH:
458 nexthdr = ptr[0];
459 len = (ptr[1] + 2) << 2;
460 break;
461 default:
462 nexthdr = ptr[0];
463 len = (ptr[1] + 1) << 3;
464 break;
465 }
466
467 off += len;
468 }
469 }
470
471 /* socket options in old style */
472 if (np->rxopt.bits.rxoinfo) {
473 struct in6_pktinfo src_info;
474
475 src_info.ipi6_ifindex = opt->iif;
476 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
477 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
478 }
479 if (np->rxopt.bits.rxohlim) {
480 int hlim = ipv6_hdr(skb)->hop_limit;
481 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
482 }
483 if (np->rxopt.bits.ohopopts && opt->hop) {
484 u8 *ptr = nh + opt->hop;
485 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
486 }
487 if (np->rxopt.bits.odstopts && opt->dst0) {
488 u8 *ptr = nh + opt->dst0;
489 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
490 }
491 if (np->rxopt.bits.osrcrt && opt->srcrt) {
492 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
493 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
494 }
495 if (np->rxopt.bits.odstopts && opt->dst1) {
496 u8 *ptr = nh + opt->dst1;
497 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
498 }
499 return 0;
500 }
501
502 int datagram_send_ctl(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 struct net_device *dev = NULL;
516
517 if (!CMSG_OK(msg, cmsg)) {
518 err = -EINVAL;
519 goto exit_f;
520 }
521
522 if (cmsg->cmsg_level != SOL_IPV6)
523 continue;
524
525 switch (cmsg->cmsg_type) {
526 case IPV6_PKTINFO:
527 case IPV6_2292PKTINFO:
528 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
529 err = -EINVAL;
530 goto exit_f;
531 }
532
533 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
534
535 if (src_info->ipi6_ifindex) {
536 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
537 return -EINVAL;
538 fl->oif = src_info->ipi6_ifindex;
539 }
540
541 addr_type = ipv6_addr_type(&src_info->ipi6_addr);
542
543 if (addr_type == IPV6_ADDR_ANY)
544 break;
545
546 if (addr_type & IPV6_ADDR_LINKLOCAL) {
547 if (!src_info->ipi6_ifindex)
548 return -EINVAL;
549 else {
550 dev = dev_get_by_index(src_info->ipi6_ifindex);
551 if (!dev)
552 return -ENODEV;
553 }
554 }
555 if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) {
556 if (dev)
557 dev_put(dev);
558 err = -EINVAL;
559 goto exit_f;
560 }
561 if (dev)
562 dev_put(dev);
563
564 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
565 break;
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 case IPV6_SRCRT_TYPE_0:
664 #ifdef CONFIG_IPV6_MIP6
665 case IPV6_SRCRT_TYPE_2:
666 #endif
667 break;
668 default:
669 err = -EINVAL;
670 goto exit_f;
671 }
672
673 len = ((rthdr->hdrlen + 1) << 3);
674
675 if (cmsg->cmsg_len < CMSG_LEN(len)) {
676 err = -EINVAL;
677 goto exit_f;
678 }
679
680 /* segments left must also match */
681 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
682 err = -EINVAL;
683 goto exit_f;
684 }
685
686 opt->opt_nflen += len;
687 opt->srcrt = rthdr;
688
689 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
690 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
691
692 opt->opt_nflen += dsthdrlen;
693 opt->dst0opt = opt->dst1opt;
694 opt->dst1opt = NULL;
695 opt->opt_flen -= dsthdrlen;
696 }
697
698 break;
699
700 case IPV6_2292HOPLIMIT:
701 case IPV6_HOPLIMIT:
702 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
703 err = -EINVAL;
704 goto exit_f;
705 }
706
707 *hlimit = *(int *)CMSG_DATA(cmsg);
708 break;
709
710 case IPV6_TCLASS:
711 {
712 int tc;
713
714 err = -EINVAL;
715 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
716 goto exit_f;
717 }
718
719 tc = *(int *)CMSG_DATA(cmsg);
720 if (tc < -1 || tc > 0xff)
721 goto exit_f;
722
723 err = 0;
724 *tclass = tc;
725
726 break;
727 }
728 default:
729 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
730 cmsg->cmsg_type);
731 err = -EINVAL;
732 break;
733 }
734 }
735
736 exit_f:
737 return err;
738 }
Tomato firmware and modifications.