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Linux 3.8-rc7
[cris-mirror.git] / net / ipv6 / datagram.c
blob7a778b9a7b859586219a37c7f80bd6ffeefe27c6
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 #include <linux/slab.h>
25 #include <linux/export.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 bool 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, final;
48 struct dst_entry *dst;
49 struct flowi6 fl6;
50 struct ip6_flowlabel *flowlabel = NULL;
51 struct ipv6_txoptions *opt;
52 int addr_type;
53 int err;
54
55 if (usin->sin6_family == AF_INET) {
56 if (__ipv6_only_sock(sk))
57 return -EAFNOSUPPORT;
58 err = ip4_datagram_connect(sk, uaddr, addr_len);
59 goto ipv4_connected;
60 }
61
62 if (addr_len < SIN6_LEN_RFC2133)
63 return -EINVAL;
64
65 if (usin->sin6_family != AF_INET6)
66 return -EAFNOSUPPORT;
67
68 memset(&fl6, 0, sizeof(fl6));
69 if (np->sndflow) {
70 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
71 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
72 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
73 if (flowlabel == NULL)
74 return -EINVAL;
75 usin->sin6_addr = flowlabel->dst;
76 }
77 }
78
79 addr_type = ipv6_addr_type(&usin->sin6_addr);
80
81 if (addr_type == IPV6_ADDR_ANY) {
82 /*
83 * connect to self
84 */
85 usin->sin6_addr.s6_addr[15] = 0x01;
86 }
87
88 daddr = &usin->sin6_addr;
89
90 if (addr_type == IPV6_ADDR_MAPPED) {
91 struct sockaddr_in sin;
92
93 if (__ipv6_only_sock(sk)) {
94 err = -ENETUNREACH;
95 goto out;
96 }
97 sin.sin_family = AF_INET;
98 sin.sin_addr.s_addr = daddr->s6_addr32[3];
99 sin.sin_port = usin->sin6_port;
100
101 err = ip4_datagram_connect(sk,
102 (struct sockaddr *) &sin,
103 sizeof(sin));
104
105 ipv4_connected:
106 if (err)
107 goto out;
108
109 ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr);
110
111 if (ipv6_addr_any(&np->saddr) ||
112 ipv6_mapped_addr_any(&np->saddr))
113 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
114
115 if (ipv6_addr_any(&np->rcv_saddr) ||
116 ipv6_mapped_addr_any(&np->rcv_saddr)) {
117 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
118 &np->rcv_saddr);
119 if (sk->sk_prot->rehash)
120 sk->sk_prot->rehash(sk);
121 }
122
123 goto out;
124 }
125
126 if (addr_type&IPV6_ADDR_LINKLOCAL) {
127 if (addr_len >= sizeof(struct sockaddr_in6) &&
128 usin->sin6_scope_id) {
129 if (sk->sk_bound_dev_if &&
130 sk->sk_bound_dev_if != usin->sin6_scope_id) {
131 err = -EINVAL;
132 goto out;
133 }
134 sk->sk_bound_dev_if = usin->sin6_scope_id;
135 }
136
137 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
138 sk->sk_bound_dev_if = np->mcast_oif;
139
140 /* Connect to link-local address requires an interface */
141 if (!sk->sk_bound_dev_if) {
142 err = -EINVAL;
143 goto out;
144 }
145 }
146
147 np->daddr = *daddr;
148 np->flow_label = fl6.flowlabel;
149
150 inet->inet_dport = usin->sin6_port;
151
152 /*
153 * Check for a route to destination an obtain the
154 * destination cache for it.
155 */
156
157 fl6.flowi6_proto = sk->sk_protocol;
158 fl6.daddr = np->daddr;
159 fl6.saddr = np->saddr;
160 fl6.flowi6_oif = sk->sk_bound_dev_if;
161 fl6.flowi6_mark = sk->sk_mark;
162 fl6.fl6_dport = inet->inet_dport;
163 fl6.fl6_sport = inet->inet_sport;
164
165 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
166 fl6.flowi6_oif = np->mcast_oif;
167
168 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
169
170 opt = flowlabel ? flowlabel->opt : np->opt;
171 final_p = fl6_update_dst(&fl6, opt, &final);
172
173 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
174 err = 0;
175 if (IS_ERR(dst)) {
176 err = PTR_ERR(dst);
177 goto out;
178 }
179
180 /* source address lookup done in ip6_dst_lookup */
181
182 if (ipv6_addr_any(&np->saddr))
183 np->saddr = fl6.saddr;
184
185 if (ipv6_addr_any(&np->rcv_saddr)) {
186 np->rcv_saddr = fl6.saddr;
187 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
188 if (sk->sk_prot->rehash)
189 sk->sk_prot->rehash(sk);
190 }
191
192 ip6_dst_store(sk, dst,
193 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
194 &np->daddr : NULL,
195 #ifdef CONFIG_IPV6_SUBTREES
196 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
197 &np->saddr :
198 #endif
199 NULL);
200
201 sk->sk_state = TCP_ESTABLISHED;
202 out:
203 fl6_sock_release(flowlabel);
204 return err;
205 }
206 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
207
208 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
209 __be16 port, u32 info, u8 *payload)
210 {
211 struct ipv6_pinfo *np = inet6_sk(sk);
212 struct icmp6hdr *icmph = icmp6_hdr(skb);
213 struct sock_exterr_skb *serr;
214
215 if (!np->recverr)
216 return;
217
218 skb = skb_clone(skb, GFP_ATOMIC);
219 if (!skb)
220 return;
221
222 skb->protocol = htons(ETH_P_IPV6);
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 flowi6 *fl6, 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->protocol = htons(ETH_P_IPV6);
258
259 skb_put(skb, sizeof(struct ipv6hdr));
260 skb_reset_network_header(skb);
261 iph = ipv6_hdr(skb);
262 iph->daddr = fl6->daddr;
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 = fl6->fl6_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 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
283 {
284 struct ipv6_pinfo *np = inet6_sk(sk);
285 struct ipv6hdr *iph;
286 struct sk_buff *skb;
287 struct ip6_mtuinfo *mtu_info;
288
289 if (!np->rxopt.bits.rxpmtu)
290 return;
291
292 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
293 if (!skb)
294 return;
295
296 skb_put(skb, sizeof(struct ipv6hdr));
297 skb_reset_network_header(skb);
298 iph = ipv6_hdr(skb);
299 iph->daddr = fl6->daddr;
300
301 mtu_info = IP6CBMTU(skb);
302
303 mtu_info->ip6m_mtu = mtu;
304 mtu_info->ip6m_addr.sin6_family = AF_INET6;
305 mtu_info->ip6m_addr.sin6_port = 0;
306 mtu_info->ip6m_addr.sin6_flowinfo = 0;
307 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
308 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
309
310 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
311 skb_reset_transport_header(skb);
312
313 skb = xchg(&np->rxpmtu, skb);
314 kfree_skb(skb);
315 }
316
317 /*
318 * Handle MSG_ERRQUEUE
319 */
320 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
321 {
322 struct ipv6_pinfo *np = inet6_sk(sk);
323 struct sock_exterr_skb *serr;
324 struct sk_buff *skb, *skb2;
325 struct sockaddr_in6 *sin;
326 struct {
327 struct sock_extended_err ee;
328 struct sockaddr_in6 offender;
329 } errhdr;
330 int err;
331 int copied;
332
333 err = -EAGAIN;
334 skb = skb_dequeue(&sk->sk_error_queue);
335 if (skb == NULL)
336 goto out;
337
338 copied = skb->len;
339 if (copied > len) {
340 msg->msg_flags |= MSG_TRUNC;
341 copied = len;
342 }
343 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
344 if (err)
345 goto out_free_skb;
346
347 sock_recv_timestamp(msg, sk, skb);
348
349 serr = SKB_EXT_ERR(skb);
350
351 sin = (struct sockaddr_in6 *)msg->msg_name;
352 if (sin) {
353 const unsigned char *nh = skb_network_header(skb);
354 sin->sin6_family = AF_INET6;
355 sin->sin6_flowinfo = 0;
356 sin->sin6_port = serr->port;
357 sin->sin6_scope_id = 0;
358 if (skb->protocol == htons(ETH_P_IPV6)) {
359 sin->sin6_addr =
360 *(struct in6_addr *)(nh + serr->addr_offset);
361 if (np->sndflow)
362 sin->sin6_flowinfo =
363 (*(__be32 *)(nh + serr->addr_offset - 24) &
364 IPV6_FLOWINFO_MASK);
365 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
366 sin->sin6_scope_id = IP6CB(skb)->iif;
367 } else {
368 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
369 &sin->sin6_addr);
370 }
371 }
372
373 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
374 sin = &errhdr.offender;
375 sin->sin6_family = AF_UNSPEC;
376 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
377 sin->sin6_family = AF_INET6;
378 sin->sin6_flowinfo = 0;
379 sin->sin6_scope_id = 0;
380 if (skb->protocol == htons(ETH_P_IPV6)) {
381 sin->sin6_addr = ipv6_hdr(skb)->saddr;
382 if (np->rxopt.all)
383 ip6_datagram_recv_ctl(sk, msg, skb);
384 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
385 sin->sin6_scope_id = IP6CB(skb)->iif;
386 } else {
387 struct inet_sock *inet = inet_sk(sk);
388
389 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
390 &sin->sin6_addr);
391 if (inet->cmsg_flags)
392 ip_cmsg_recv(msg, skb);
393 }
394 }
395
396 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
397
398 /* Now we could try to dump offended packet options */
399
400 msg->msg_flags |= MSG_ERRQUEUE;
401 err = copied;
402
403 /* Reset and regenerate socket error */
404 spin_lock_bh(&sk->sk_error_queue.lock);
405 sk->sk_err = 0;
406 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
407 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
408 spin_unlock_bh(&sk->sk_error_queue.lock);
409 sk->sk_error_report(sk);
410 } else {
411 spin_unlock_bh(&sk->sk_error_queue.lock);
412 }
413
414 out_free_skb:
415 kfree_skb(skb);
416 out:
417 return err;
418 }
419 EXPORT_SYMBOL_GPL(ipv6_recv_error);
420
421 /*
422 * Handle IPV6_RECVPATHMTU
423 */
424 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len)
425 {
426 struct ipv6_pinfo *np = inet6_sk(sk);
427 struct sk_buff *skb;
428 struct sockaddr_in6 *sin;
429 struct ip6_mtuinfo mtu_info;
430 int err;
431 int copied;
432
433 err = -EAGAIN;
434 skb = xchg(&np->rxpmtu, NULL);
435 if (skb == NULL)
436 goto out;
437
438 copied = skb->len;
439 if (copied > len) {
440 msg->msg_flags |= MSG_TRUNC;
441 copied = len;
442 }
443 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
444 if (err)
445 goto out_free_skb;
446
447 sock_recv_timestamp(msg, sk, skb);
448
449 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
450
451 sin = (struct sockaddr_in6 *)msg->msg_name;
452 if (sin) {
453 sin->sin6_family = AF_INET6;
454 sin->sin6_flowinfo = 0;
455 sin->sin6_port = 0;
456 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
457 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
458 }
459
460 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
461
462 err = copied;
463
464 out_free_skb:
465 kfree_skb(skb);
466 out:
467 return err;
468 }
469
470
471 int ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
472 struct sk_buff *skb)
473 {
474 struct ipv6_pinfo *np = inet6_sk(sk);
475 struct inet6_skb_parm *opt = IP6CB(skb);
476 unsigned char *nh = skb_network_header(skb);
477
478 if (np->rxopt.bits.rxinfo) {
479 struct in6_pktinfo src_info;
480
481 src_info.ipi6_ifindex = opt->iif;
482 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
483 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
484 }
485
486 if (np->rxopt.bits.rxhlim) {
487 int hlim = ipv6_hdr(skb)->hop_limit;
488 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
489 }
490
491 if (np->rxopt.bits.rxtclass) {
492 int tclass = ipv6_tclass(ipv6_hdr(skb));
493 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
494 }
495
496 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
497 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
498 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
499 }
500
501 /* HbH is allowed only once */
502 if (np->rxopt.bits.hopopts && opt->hop) {
503 u8 *ptr = nh + opt->hop;
504 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
505 }
506
507 if (opt->lastopt &&
508 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
509 /*
510 * Silly enough, but we need to reparse in order to
511 * report extension headers (except for HbH)
512 * in order.
513 *
514 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
515 * (and WILL NOT be) defined because
516 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
517 */
518 unsigned int off = sizeof(struct ipv6hdr);
519 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
520
521 while (off <= opt->lastopt) {
522 unsigned int len;
523 u8 *ptr = nh + off;
524
525 switch (nexthdr) {
526 case IPPROTO_DSTOPTS:
527 nexthdr = ptr[0];
528 len = (ptr[1] + 1) << 3;
529 if (np->rxopt.bits.dstopts)
530 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
531 break;
532 case IPPROTO_ROUTING:
533 nexthdr = ptr[0];
534 len = (ptr[1] + 1) << 3;
535 if (np->rxopt.bits.srcrt)
536 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
537 break;
538 case IPPROTO_AH:
539 nexthdr = ptr[0];
540 len = (ptr[1] + 2) << 2;
541 break;
542 default:
543 nexthdr = ptr[0];
544 len = (ptr[1] + 1) << 3;
545 break;
546 }
547
548 off += len;
549 }
550 }
551
552 /* socket options in old style */
553 if (np->rxopt.bits.rxoinfo) {
554 struct in6_pktinfo src_info;
555
556 src_info.ipi6_ifindex = opt->iif;
557 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
558 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
559 }
560 if (np->rxopt.bits.rxohlim) {
561 int hlim = ipv6_hdr(skb)->hop_limit;
562 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
563 }
564 if (np->rxopt.bits.ohopopts && opt->hop) {
565 u8 *ptr = nh + opt->hop;
566 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
567 }
568 if (np->rxopt.bits.odstopts && opt->dst0) {
569 u8 *ptr = nh + opt->dst0;
570 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
571 }
572 if (np->rxopt.bits.osrcrt && opt->srcrt) {
573 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
574 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
575 }
576 if (np->rxopt.bits.odstopts && opt->dst1) {
577 u8 *ptr = nh + opt->dst1;
578 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
579 }
580 if (np->rxopt.bits.rxorigdstaddr) {
581 struct sockaddr_in6 sin6;
582 __be16 *ports = (__be16 *) skb_transport_header(skb);
583
584 if (skb_transport_offset(skb) + 4 <= skb->len) {
585 /* All current transport protocols have the port numbers in the
586 * first four bytes of the transport header and this function is
587 * written with this assumption in mind.
588 */
589
590 sin6.sin6_family = AF_INET6;
591 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
592 sin6.sin6_port = ports[1];
593 sin6.sin6_flowinfo = 0;
594 sin6.sin6_scope_id = 0;
595
596 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
597 }
598 }
599 return 0;
600 }
601 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
602
603 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
604 struct msghdr *msg, struct flowi6 *fl6,
605 struct ipv6_txoptions *opt,
606 int *hlimit, int *tclass, int *dontfrag)
607 {
608 struct in6_pktinfo *src_info;
609 struct cmsghdr *cmsg;
610 struct ipv6_rt_hdr *rthdr;
611 struct ipv6_opt_hdr *hdr;
612 int len;
613 int err = 0;
614
615 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
616 int addr_type;
617
618 if (!CMSG_OK(msg, cmsg)) {
619 err = -EINVAL;
620 goto exit_f;
621 }
622
623 if (cmsg->cmsg_level != SOL_IPV6)
624 continue;
625
626 switch (cmsg->cmsg_type) {
627 case IPV6_PKTINFO:
628 case IPV6_2292PKTINFO:
629 {
630 struct net_device *dev = NULL;
631
632 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
633 err = -EINVAL;
634 goto exit_f;
635 }
636
637 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
638
639 if (src_info->ipi6_ifindex) {
640 if (fl6->flowi6_oif &&
641 src_info->ipi6_ifindex != fl6->flowi6_oif)
642 return -EINVAL;
643 fl6->flowi6_oif = src_info->ipi6_ifindex;
644 }
645
646 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
647
648 rcu_read_lock();
649 if (fl6->flowi6_oif) {
650 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
651 if (!dev) {
652 rcu_read_unlock();
653 return -ENODEV;
654 }
655 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
656 rcu_read_unlock();
657 return -EINVAL;
658 }
659
660 if (addr_type != IPV6_ADDR_ANY) {
661 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
662 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
663 !ipv6_chk_addr(net, &src_info->ipi6_addr,
664 strict ? dev : NULL, 0))
665 err = -EINVAL;
666 else
667 fl6->saddr = src_info->ipi6_addr;
668 }
669
670 rcu_read_unlock();
671
672 if (err)
673 goto exit_f;
674
675 break;
676 }
677
678 case IPV6_FLOWINFO:
679 if (cmsg->cmsg_len < CMSG_LEN(4)) {
680 err = -EINVAL;
681 goto exit_f;
682 }
683
684 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
685 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
686 err = -EINVAL;
687 goto exit_f;
688 }
689 }
690 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
691 break;
692
693 case IPV6_2292HOPOPTS:
694 case IPV6_HOPOPTS:
695 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
696 err = -EINVAL;
697 goto exit_f;
698 }
699
700 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
701 len = ((hdr->hdrlen + 1) << 3);
702 if (cmsg->cmsg_len < CMSG_LEN(len)) {
703 err = -EINVAL;
704 goto exit_f;
705 }
706 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
707 err = -EPERM;
708 goto exit_f;
709 }
710 opt->opt_nflen += len;
711 opt->hopopt = hdr;
712 break;
713
714 case IPV6_2292DSTOPTS:
715 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
716 err = -EINVAL;
717 goto exit_f;
718 }
719
720 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
721 len = ((hdr->hdrlen + 1) << 3);
722 if (cmsg->cmsg_len < CMSG_LEN(len)) {
723 err = -EINVAL;
724 goto exit_f;
725 }
726 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
727 err = -EPERM;
728 goto exit_f;
729 }
730 if (opt->dst1opt) {
731 err = -EINVAL;
732 goto exit_f;
733 }
734 opt->opt_flen += len;
735 opt->dst1opt = hdr;
736 break;
737
738 case IPV6_DSTOPTS:
739 case IPV6_RTHDRDSTOPTS:
740 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
741 err = -EINVAL;
742 goto exit_f;
743 }
744
745 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
746 len = ((hdr->hdrlen + 1) << 3);
747 if (cmsg->cmsg_len < CMSG_LEN(len)) {
748 err = -EINVAL;
749 goto exit_f;
750 }
751 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
752 err = -EPERM;
753 goto exit_f;
754 }
755 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
756 opt->opt_flen += len;
757 opt->dst1opt = hdr;
758 } else {
759 opt->opt_nflen += len;
760 opt->dst0opt = hdr;
761 }
762 break;
763
764 case IPV6_2292RTHDR:
765 case IPV6_RTHDR:
766 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
767 err = -EINVAL;
768 goto exit_f;
769 }
770
771 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
772
773 switch (rthdr->type) {
774 #if IS_ENABLED(CONFIG_IPV6_MIP6)
775 case IPV6_SRCRT_TYPE_2:
776 if (rthdr->hdrlen != 2 ||
777 rthdr->segments_left != 1) {
778 err = -EINVAL;
779 goto exit_f;
780 }
781 break;
782 #endif
783 default:
784 err = -EINVAL;
785 goto exit_f;
786 }
787
788 len = ((rthdr->hdrlen + 1) << 3);
789
790 if (cmsg->cmsg_len < CMSG_LEN(len)) {
791 err = -EINVAL;
792 goto exit_f;
793 }
794
795 /* segments left must also match */
796 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
797 err = -EINVAL;
798 goto exit_f;
799 }
800
801 opt->opt_nflen += len;
802 opt->srcrt = rthdr;
803
804 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
805 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
806
807 opt->opt_nflen += dsthdrlen;
808 opt->dst0opt = opt->dst1opt;
809 opt->dst1opt = NULL;
810 opt->opt_flen -= dsthdrlen;
811 }
812
813 break;
814
815 case IPV6_2292HOPLIMIT:
816 case IPV6_HOPLIMIT:
817 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
818 err = -EINVAL;
819 goto exit_f;
820 }
821
822 *hlimit = *(int *)CMSG_DATA(cmsg);
823 if (*hlimit < -1 || *hlimit > 0xff) {
824 err = -EINVAL;
825 goto exit_f;
826 }
827
828 break;
829
830 case IPV6_TCLASS:
831 {
832 int tc;
833
834 err = -EINVAL;
835 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
836 goto exit_f;
837
838 tc = *(int *)CMSG_DATA(cmsg);
839 if (tc < -1 || tc > 0xff)
840 goto exit_f;
841
842 err = 0;
843 *tclass = tc;
844
845 break;
846 }
847
848 case IPV6_DONTFRAG:
849 {
850 int df;
851
852 err = -EINVAL;
853 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
854 goto exit_f;
855
856 df = *(int *)CMSG_DATA(cmsg);
857 if (df < 0 || df > 1)
858 goto exit_f;
859
860 err = 0;
861 *dontfrag = df;
862
863 break;
864 }
865 default:
866 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
867 cmsg->cmsg_type);
868 err = -EINVAL;
869 goto exit_f;
870 }
871 }
872
873 exit_f:
874 return err;
875 }
876 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
CRIS linux kernel tree