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[MLSXFRM]: Add flow labeling
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / datagram.c
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/sched.h>
21 #include <linux/interrupt.h>
22 #include <linux/socket.h>
23 #include <linux/sockios.h>
24 #include <linux/in6.h>
25 #include <linux/ipv6.h>
26 #include <linux/route.h>
27
28 #include <net/ipv6.h>
29 #include <net/ndisc.h>
30 #include <net/addrconf.h>
31 #include <net/transp_v6.h>
32 #include <net/ip6_route.h>
33 #include <net/tcp_states.h>
34
35 #include <linux/errqueue.h>
36 #include <asm/uaccess.h>
37
38 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
39 {
40 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
41 struct inet_sock *inet = inet_sk(sk);
42 struct ipv6_pinfo *np = inet6_sk(sk);
43 struct in6_addr *daddr, *final_p = NULL, final;
44 struct dst_entry *dst;
45 struct flowi fl;
46 struct ip6_flowlabel *flowlabel = NULL;
47 int addr_type;
48 int err;
49
50 if (usin->sin6_family == AF_INET) {
51 if (__ipv6_only_sock(sk))
52 return -EAFNOSUPPORT;
53 err = ip4_datagram_connect(sk, uaddr, addr_len);
54 goto ipv4_connected;
55 }
56
57 if (addr_len < SIN6_LEN_RFC2133)
58 return -EINVAL;
59
60 if (usin->sin6_family != AF_INET6)
61 return -EAFNOSUPPORT;
62
63 memset(&fl, 0, sizeof(fl));
64 if (np->sndflow) {
65 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
66 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
67 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
68 if (flowlabel == NULL)
69 return -EINVAL;
70 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
71 }
72 }
73
74 addr_type = ipv6_addr_type(&usin->sin6_addr);
75
76 if (addr_type == IPV6_ADDR_ANY) {
77 /*
78 * connect to self
79 */
80 usin->sin6_addr.s6_addr[15] = 0x01;
81 }
82
83 daddr = &usin->sin6_addr;
84
85 if (addr_type == IPV6_ADDR_MAPPED) {
86 struct sockaddr_in sin;
87
88 if (__ipv6_only_sock(sk)) {
89 err = -ENETUNREACH;
90 goto out;
91 }
92 sin.sin_family = AF_INET;
93 sin.sin_addr.s_addr = daddr->s6_addr32[3];
94 sin.sin_port = usin->sin6_port;
95
96 err = ip4_datagram_connect(sk,
97 (struct sockaddr*) &sin,
98 sizeof(sin));
99
100 ipv4_connected:
101 if (err)
102 goto out;
103
104 ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr);
105
106 if (ipv6_addr_any(&np->saddr)) {
107 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff),
108 inet->saddr);
109 }
110
111 if (ipv6_addr_any(&np->rcv_saddr)) {
112 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff),
113 inet->rcv_saddr);
114 }
115 goto out;
116 }
117
118 if (addr_type&IPV6_ADDR_LINKLOCAL) {
119 if (addr_len >= sizeof(struct sockaddr_in6) &&
120 usin->sin6_scope_id) {
121 if (sk->sk_bound_dev_if &&
122 sk->sk_bound_dev_if != usin->sin6_scope_id) {
123 err = -EINVAL;
124 goto out;
125 }
126 sk->sk_bound_dev_if = usin->sin6_scope_id;
127 if (!sk->sk_bound_dev_if &&
128 (addr_type & IPV6_ADDR_MULTICAST))
129 fl.oif = np->mcast_oif;
130 }
131
132 /* Connect to link-local address requires an interface */
133 if (!sk->sk_bound_dev_if) {
134 err = -EINVAL;
135 goto out;
136 }
137 }
138
139 ipv6_addr_copy(&np->daddr, daddr);
140 np->flow_label = fl.fl6_flowlabel;
141
142 inet->dport = usin->sin6_port;
143
144 /*
145 * Check for a route to destination an obtain the
146 * destination cache for it.
147 */
148
149 fl.proto = sk->sk_protocol;
150 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
151 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
152 fl.oif = sk->sk_bound_dev_if;
153 fl.fl_ip_dport = inet->dport;
154 fl.fl_ip_sport = inet->sport;
155
156 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
157 fl.oif = np->mcast_oif;
158
159 security_sk_classify_flow(sk, &fl);
160
161 if (flowlabel) {
162 if (flowlabel->opt && flowlabel->opt->srcrt) {
163 struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
164 ipv6_addr_copy(&final, &fl.fl6_dst);
165 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
166 final_p = &final;
167 }
168 } else if (np->opt && np->opt->srcrt) {
169 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
170 ipv6_addr_copy(&final, &fl.fl6_dst);
171 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
172 final_p = &final;
173 }
174
175 err = ip6_dst_lookup(sk, &dst, &fl);
176 if (err)
177 goto out;
178 if (final_p)
179 ipv6_addr_copy(&fl.fl6_dst, final_p);
180
181 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
182 goto out;
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
198 sk->sk_state = TCP_ESTABLISHED;
199 out:
200 fl6_sock_release(flowlabel);
201 return err;
202 }
203
204 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
205 u16 port, u32 info, u8 *payload)
206 {
207 struct ipv6_pinfo *np = inet6_sk(sk);
208 struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw;
209 struct sock_exterr_skb *serr;
210
211 if (!np->recverr)
212 return;
213
214 skb = skb_clone(skb, GFP_ATOMIC);
215 if (!skb)
216 return;
217
218 serr = SKB_EXT_ERR(skb);
219 serr->ee.ee_errno = err;
220 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
221 serr->ee.ee_type = icmph->icmp6_type;
222 serr->ee.ee_code = icmph->icmp6_code;
223 serr->ee.ee_pad = 0;
224 serr->ee.ee_info = info;
225 serr->ee.ee_data = 0;
226 serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw;
227 serr->port = port;
228
229 skb->h.raw = payload;
230 __skb_pull(skb, payload - skb->data);
231
232 if (sock_queue_err_skb(sk, skb))
233 kfree_skb(skb);
234 }
235
236 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
237 {
238 struct ipv6_pinfo *np = inet6_sk(sk);
239 struct sock_exterr_skb *serr;
240 struct ipv6hdr *iph;
241 struct sk_buff *skb;
242
243 if (!np->recverr)
244 return;
245
246 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
247 if (!skb)
248 return;
249
250 iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));
251 skb->nh.ipv6h = iph;
252 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
253
254 serr = SKB_EXT_ERR(skb);
255 serr->ee.ee_errno = err;
256 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
257 serr->ee.ee_type = 0;
258 serr->ee.ee_code = 0;
259 serr->ee.ee_pad = 0;
260 serr->ee.ee_info = info;
261 serr->ee.ee_data = 0;
262 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
263 serr->port = fl->fl_ip_dport;
264
265 skb->h.raw = skb->tail;
266 __skb_pull(skb, skb->tail - skb->data);
267
268 if (sock_queue_err_skb(sk, skb))
269 kfree_skb(skb);
270 }
271
272 /*
273 * Handle MSG_ERRQUEUE
274 */
275 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
276 {
277 struct ipv6_pinfo *np = inet6_sk(sk);
278 struct sock_exterr_skb *serr;
279 struct sk_buff *skb, *skb2;
280 struct sockaddr_in6 *sin;
281 struct {
282 struct sock_extended_err ee;
283 struct sockaddr_in6 offender;
284 } errhdr;
285 int err;
286 int copied;
287
288 err = -EAGAIN;
289 skb = skb_dequeue(&sk->sk_error_queue);
290 if (skb == NULL)
291 goto out;
292
293 copied = skb->len;
294 if (copied > len) {
295 msg->msg_flags |= MSG_TRUNC;
296 copied = len;
297 }
298 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
299 if (err)
300 goto out_free_skb;
301
302 sock_recv_timestamp(msg, sk, skb);
303
304 serr = SKB_EXT_ERR(skb);
305
306 sin = (struct sockaddr_in6 *)msg->msg_name;
307 if (sin) {
308 sin->sin6_family = AF_INET6;
309 sin->sin6_flowinfo = 0;
310 sin->sin6_port = serr->port;
311 sin->sin6_scope_id = 0;
312 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
313 ipv6_addr_copy(&sin->sin6_addr,
314 (struct in6_addr *)(skb->nh.raw + serr->addr_offset));
315 if (np->sndflow)
316 sin->sin6_flowinfo = *(u32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
317 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
318 sin->sin6_scope_id = IP6CB(skb)->iif;
319 } else {
320 ipv6_addr_set(&sin->sin6_addr, 0, 0,
321 htonl(0xffff),
322 *(u32*)(skb->nh.raw + serr->addr_offset));
323 }
324 }
325
326 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
327 sin = &errhdr.offender;
328 sin->sin6_family = AF_UNSPEC;
329 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
330 sin->sin6_family = AF_INET6;
331 sin->sin6_flowinfo = 0;
332 sin->sin6_scope_id = 0;
333 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
334 ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr);
335 if (np->rxopt.all)
336 datagram_recv_ctl(sk, msg, skb);
337 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
338 sin->sin6_scope_id = IP6CB(skb)->iif;
339 } else {
340 struct inet_sock *inet = inet_sk(sk);
341
342 ipv6_addr_set(&sin->sin6_addr, 0, 0,
343 htonl(0xffff),
344 skb->nh.iph->saddr);
345 if (inet->cmsg_flags)
346 ip_cmsg_recv(msg, skb);
347 }
348 }
349
350 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
351
352 /* Now we could try to dump offended packet options */
353
354 msg->msg_flags |= MSG_ERRQUEUE;
355 err = copied;
356
357 /* Reset and regenerate socket error */
358 spin_lock_bh(&sk->sk_error_queue.lock);
359 sk->sk_err = 0;
360 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
361 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
362 spin_unlock_bh(&sk->sk_error_queue.lock);
363 sk->sk_error_report(sk);
364 } else {
365 spin_unlock_bh(&sk->sk_error_queue.lock);
366 }
367
368 out_free_skb:
369 kfree_skb(skb);
370 out:
371 return err;
372 }
373
374
375
376 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
377 {
378 struct ipv6_pinfo *np = inet6_sk(sk);
379 struct inet6_skb_parm *opt = IP6CB(skb);
380
381 if (np->rxopt.bits.rxinfo) {
382 struct in6_pktinfo src_info;
383
384 src_info.ipi6_ifindex = opt->iif;
385 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
386 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
387 }
388
389 if (np->rxopt.bits.rxhlim) {
390 int hlim = skb->nh.ipv6h->hop_limit;
391 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
392 }
393
394 if (np->rxopt.bits.rxtclass) {
395 int tclass = (ntohl(*(u32 *)skb->nh.ipv6h) >> 20) & 0xff;
396 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
397 }
398
399 if (np->rxopt.bits.rxflow && (*(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
400 u32 flowinfo = *(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK;
401 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
402 }
403
404 /* HbH is allowed only once */
405 if (np->rxopt.bits.hopopts && opt->hop) {
406 u8 *ptr = skb->nh.raw + opt->hop;
407 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
408 }
409
410 if (opt->lastopt &&
411 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
412 /*
413 * Silly enough, but we need to reparse in order to
414 * report extension headers (except for HbH)
415 * in order.
416 *
417 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
418 * (and WILL NOT be) defined because
419 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
420 */
421 unsigned int off = sizeof(struct ipv6hdr);
422 u8 nexthdr = skb->nh.ipv6h->nexthdr;
423
424 while (off <= opt->lastopt) {
425 unsigned len;
426 u8 *ptr = skb->nh.raw + off;
427
428 switch(nexthdr) {
429 case IPPROTO_DSTOPTS:
430 nexthdr = ptr[0];
431 len = (ptr[1] + 1) << 3;
432 if (np->rxopt.bits.dstopts)
433 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
434 break;
435 case IPPROTO_ROUTING:
436 nexthdr = ptr[0];
437 len = (ptr[1] + 1) << 3;
438 if (np->rxopt.bits.srcrt)
439 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
440 break;
441 case IPPROTO_AH:
442 nexthdr = ptr[0];
443 len = (ptr[1] + 2) << 2;
444 break;
445 default:
446 nexthdr = ptr[0];
447 len = (ptr[1] + 1) << 3;
448 break;
449 }
450
451 off += len;
452 }
453 }
454
455 /* socket options in old style */
456 if (np->rxopt.bits.rxoinfo) {
457 struct in6_pktinfo src_info;
458
459 src_info.ipi6_ifindex = opt->iif;
460 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
461 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
462 }
463 if (np->rxopt.bits.rxohlim) {
464 int hlim = skb->nh.ipv6h->hop_limit;
465 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
466 }
467 if (np->rxopt.bits.ohopopts && opt->hop) {
468 u8 *ptr = skb->nh.raw + opt->hop;
469 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
470 }
471 if (np->rxopt.bits.odstopts && opt->dst0) {
472 u8 *ptr = skb->nh.raw + opt->dst0;
473 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
474 }
475 if (np->rxopt.bits.osrcrt && opt->srcrt) {
476 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt);
477 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
478 }
479 if (np->rxopt.bits.odstopts && opt->dst1) {
480 u8 *ptr = skb->nh.raw + opt->dst1;
481 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
482 }
483 return 0;
484 }
485
486 int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
487 struct ipv6_txoptions *opt,
488 int *hlimit, int *tclass)
489 {
490 struct in6_pktinfo *src_info;
491 struct cmsghdr *cmsg;
492 struct ipv6_rt_hdr *rthdr;
493 struct ipv6_opt_hdr *hdr;
494 int len;
495 int err = 0;
496
497 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
498 int addr_type;
499 struct net_device *dev = NULL;
500
501 if (!CMSG_OK(msg, cmsg)) {
502 err = -EINVAL;
503 goto exit_f;
504 }
505
506 if (cmsg->cmsg_level != SOL_IPV6)
507 continue;
508
509 switch (cmsg->cmsg_type) {
510 case IPV6_PKTINFO:
511 case IPV6_2292PKTINFO:
512 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
513 err = -EINVAL;
514 goto exit_f;
515 }
516
517 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
518
519 if (src_info->ipi6_ifindex) {
520 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
521 return -EINVAL;
522 fl->oif = src_info->ipi6_ifindex;
523 }
524
525 addr_type = ipv6_addr_type(&src_info->ipi6_addr);
526
527 if (addr_type == IPV6_ADDR_ANY)
528 break;
529
530 if (addr_type & IPV6_ADDR_LINKLOCAL) {
531 if (!src_info->ipi6_ifindex)
532 return -EINVAL;
533 else {
534 dev = dev_get_by_index(src_info->ipi6_ifindex);
535 if (!dev)
536 return -ENODEV;
537 }
538 }
539 if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) {
540 if (dev)
541 dev_put(dev);
542 err = -EINVAL;
543 goto exit_f;
544 }
545 if (dev)
546 dev_put(dev);
547
548 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
549 break;
550
551 case IPV6_FLOWINFO:
552 if (cmsg->cmsg_len < CMSG_LEN(4)) {
553 err = -EINVAL;
554 goto exit_f;
555 }
556
557 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
558 if ((fl->fl6_flowlabel^*(u32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
559 err = -EINVAL;
560 goto exit_f;
561 }
562 }
563 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(u32 *)CMSG_DATA(cmsg);
564 break;
565
566 case IPV6_2292HOPOPTS:
567 case IPV6_HOPOPTS:
568 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
569 err = -EINVAL;
570 goto exit_f;
571 }
572
573 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
574 len = ((hdr->hdrlen + 1) << 3);
575 if (cmsg->cmsg_len < CMSG_LEN(len)) {
576 err = -EINVAL;
577 goto exit_f;
578 }
579 if (!capable(CAP_NET_RAW)) {
580 err = -EPERM;
581 goto exit_f;
582 }
583 opt->opt_nflen += len;
584 opt->hopopt = hdr;
585 break;
586
587 case IPV6_2292DSTOPTS:
588 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
589 err = -EINVAL;
590 goto exit_f;
591 }
592
593 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
594 len = ((hdr->hdrlen + 1) << 3);
595 if (cmsg->cmsg_len < CMSG_LEN(len)) {
596 err = -EINVAL;
597 goto exit_f;
598 }
599 if (!capable(CAP_NET_RAW)) {
600 err = -EPERM;
601 goto exit_f;
602 }
603 if (opt->dst1opt) {
604 err = -EINVAL;
605 goto exit_f;
606 }
607 opt->opt_flen += len;
608 opt->dst1opt = hdr;
609 break;
610
611 case IPV6_DSTOPTS:
612 case IPV6_RTHDRDSTOPTS:
613 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
614 err = -EINVAL;
615 goto exit_f;
616 }
617
618 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
619 len = ((hdr->hdrlen + 1) << 3);
620 if (cmsg->cmsg_len < CMSG_LEN(len)) {
621 err = -EINVAL;
622 goto exit_f;
623 }
624 if (!capable(CAP_NET_RAW)) {
625 err = -EPERM;
626 goto exit_f;
627 }
628 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
629 opt->opt_flen += len;
630 opt->dst1opt = hdr;
631 } else {
632 opt->opt_nflen += len;
633 opt->dst0opt = hdr;
634 }
635 break;
636
637 case IPV6_2292RTHDR:
638 case IPV6_RTHDR:
639 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
640 err = -EINVAL;
641 goto exit_f;
642 }
643
644 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
645
646 /*
647 * TYPE 0
648 */
649 if (rthdr->type) {
650 err = -EINVAL;
651 goto exit_f;
652 }
653
654 len = ((rthdr->hdrlen + 1) << 3);
655
656 if (cmsg->cmsg_len < CMSG_LEN(len)) {
657 err = -EINVAL;
658 goto exit_f;
659 }
660
661 /* segments left must also match */
662 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
663 err = -EINVAL;
664 goto exit_f;
665 }
666
667 opt->opt_nflen += len;
668 opt->srcrt = rthdr;
669
670 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
671 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
672
673 opt->opt_nflen += dsthdrlen;
674 opt->dst0opt = opt->dst1opt;
675 opt->dst1opt = NULL;
676 opt->opt_flen -= dsthdrlen;
677 }
678
679 break;
680
681 case IPV6_2292HOPLIMIT:
682 case IPV6_HOPLIMIT:
683 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
684 err = -EINVAL;
685 goto exit_f;
686 }
687
688 *hlimit = *(int *)CMSG_DATA(cmsg);
689 break;
690
691 case IPV6_TCLASS:
692 {
693 int tc;
694
695 err = -EINVAL;
696 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
697 goto exit_f;
698 }
699
700 tc = *(int *)CMSG_DATA(cmsg);
701 if (tc < -1 || tc > 0xff)
702 goto exit_f;
703
704 err = 0;
705 *tclass = tc;
706
707 break;
708 }
709 default:
710 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
711 cmsg->cmsg_type);
712 err = -EINVAL;
713 break;
714 };
715 }
716
717 exit_f:
718 return err;
719 }
kernel source for telekom puls (alcatel/mediatek)