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Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 * 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 #include <net/dsfield.h>
34
35 #include <linux/errqueue.h>
36 #include <asm/uaccess.h>
37
38 static bool ipv6_mapped_addr_any(const struct in6_addr *a)
39 {
40 return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0);
41 }
42
43 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
44 {
45 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
46 struct inet_sock *inet = inet_sk(sk);
47 struct ipv6_pinfo *np = inet6_sk(sk);
48 struct in6_addr *daddr, *final_p, final;
49 struct dst_entry *dst;
50 struct flowi6 fl6;
51 struct ip6_flowlabel *flowlabel = NULL;
52 struct ipv6_txoptions *opt;
53 int addr_type;
54 int err;
55
56 if (usin->sin6_family == AF_INET) {
57 if (__ipv6_only_sock(sk))
58 return -EAFNOSUPPORT;
59 err = ip4_datagram_connect(sk, uaddr, addr_len);
60 goto ipv4_connected;
61 }
62
63 if (addr_len < SIN6_LEN_RFC2133)
64 return -EINVAL;
65
66 if (usin->sin6_family != AF_INET6)
67 return -EAFNOSUPPORT;
68
69 memset(&fl6, 0, sizeof(fl6));
70 if (np->sndflow) {
71 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
72 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
73 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
74 if (flowlabel == NULL)
75 return -EINVAL;
76 usin->sin6_addr = flowlabel->dst;
77 }
78 }
79
80 addr_type = ipv6_addr_type(&usin->sin6_addr);
81
82 if (addr_type == IPV6_ADDR_ANY) {
83 /*
84 * connect to self
85 */
86 usin->sin6_addr.s6_addr[15] = 0x01;
87 }
88
89 daddr = &usin->sin6_addr;
90
91 if (addr_type == IPV6_ADDR_MAPPED) {
92 struct sockaddr_in sin;
93
94 if (__ipv6_only_sock(sk)) {
95 err = -ENETUNREACH;
96 goto out;
97 }
98 sin.sin_family = AF_INET;
99 sin.sin_addr.s_addr = daddr->s6_addr32[3];
100 sin.sin_port = usin->sin6_port;
101
102 err = ip4_datagram_connect(sk,
103 (struct sockaddr *) &sin,
104 sizeof(sin));
105
106 ipv4_connected:
107 if (err)
108 goto out;
109
110 ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr);
111
112 if (ipv6_addr_any(&np->saddr) ||
113 ipv6_mapped_addr_any(&np->saddr))
114 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
115
116 if (ipv6_addr_any(&np->rcv_saddr) ||
117 ipv6_mapped_addr_any(&np->rcv_saddr)) {
118 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
119 &np->rcv_saddr);
120 if (sk->sk_prot->rehash)
121 sk->sk_prot->rehash(sk);
122 }
123
124 goto out;
125 }
126
127 if (__ipv6_addr_needs_scope_id(addr_type)) {
128 if (addr_len >= sizeof(struct sockaddr_in6) &&
129 usin->sin6_scope_id) {
130 if (sk->sk_bound_dev_if &&
131 sk->sk_bound_dev_if != usin->sin6_scope_id) {
132 err = -EINVAL;
133 goto out;
134 }
135 sk->sk_bound_dev_if = usin->sin6_scope_id;
136 }
137
138 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
139 sk->sk_bound_dev_if = np->mcast_oif;
140
141 /* Connect to link-local address requires an interface */
142 if (!sk->sk_bound_dev_if) {
143 err = -EINVAL;
144 goto out;
145 }
146 }
147
148 np->daddr = *daddr;
149 np->flow_label = fl6.flowlabel;
150
151 inet->inet_dport = usin->sin6_port;
152
153 /*
154 * Check for a route to destination an obtain the
155 * destination cache for it.
156 */
157
158 fl6.flowi6_proto = sk->sk_protocol;
159 fl6.daddr = np->daddr;
160 fl6.saddr = np->saddr;
161 fl6.flowi6_oif = sk->sk_bound_dev_if;
162 fl6.flowi6_mark = sk->sk_mark;
163 fl6.fl6_dport = inet->inet_dport;
164 fl6.fl6_sport = inet->inet_sport;
165
166 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
167 fl6.flowi6_oif = np->mcast_oif;
168
169 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
170
171 opt = flowlabel ? flowlabel->opt : np->opt;
172 final_p = fl6_update_dst(&fl6, opt, &final);
173
174 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
175 err = 0;
176 if (IS_ERR(dst)) {
177 err = PTR_ERR(dst);
178 goto out;
179 }
180
181 /* source address lookup done in ip6_dst_lookup */
182
183 if (ipv6_addr_any(&np->saddr))
184 np->saddr = fl6.saddr;
185
186 if (ipv6_addr_any(&np->rcv_saddr)) {
187 np->rcv_saddr = fl6.saddr;
188 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
189 if (sk->sk_prot->rehash)
190 sk->sk_prot->rehash(sk);
191 }
192
193 ip6_dst_store(sk, dst,
194 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
195 &np->daddr : NULL,
196 #ifdef CONFIG_IPV6_SUBTREES
197 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
198 &np->saddr :
199 #endif
200 NULL);
201
202 sk->sk_state = TCP_ESTABLISHED;
203 out:
204 fl6_sock_release(flowlabel);
205 return err;
206 }
207 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
208
209 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
210 __be16 port, u32 info, u8 *payload)
211 {
212 struct ipv6_pinfo *np = inet6_sk(sk);
213 struct icmp6hdr *icmph = icmp6_hdr(skb);
214 struct sock_exterr_skb *serr;
215
216 if (!np->recverr)
217 return;
218
219 skb = skb_clone(skb, GFP_ATOMIC);
220 if (!skb)
221 return;
222
223 skb->protocol = htons(ETH_P_IPV6);
224
225 serr = SKB_EXT_ERR(skb);
226 serr->ee.ee_errno = err;
227 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
228 serr->ee.ee_type = icmph->icmp6_type;
229 serr->ee.ee_code = icmph->icmp6_code;
230 serr->ee.ee_pad = 0;
231 serr->ee.ee_info = info;
232 serr->ee.ee_data = 0;
233 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
234 skb_network_header(skb);
235 serr->port = port;
236
237 __skb_pull(skb, payload - skb->data);
238 skb_reset_transport_header(skb);
239
240 if (sock_queue_err_skb(sk, skb))
241 kfree_skb(skb);
242 }
243
244 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
245 {
246 struct ipv6_pinfo *np = inet6_sk(sk);
247 struct sock_exterr_skb *serr;
248 struct ipv6hdr *iph;
249 struct sk_buff *skb;
250
251 if (!np->recverr)
252 return;
253
254 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
255 if (!skb)
256 return;
257
258 skb->protocol = htons(ETH_P_IPV6);
259
260 skb_put(skb, sizeof(struct ipv6hdr));
261 skb_reset_network_header(skb);
262 iph = ipv6_hdr(skb);
263 iph->daddr = fl6->daddr;
264
265 serr = SKB_EXT_ERR(skb);
266 serr->ee.ee_errno = err;
267 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
268 serr->ee.ee_type = 0;
269 serr->ee.ee_code = 0;
270 serr->ee.ee_pad = 0;
271 serr->ee.ee_info = info;
272 serr->ee.ee_data = 0;
273 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
274 serr->port = fl6->fl6_dport;
275
276 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
277 skb_reset_transport_header(skb);
278
279 if (sock_queue_err_skb(sk, skb))
280 kfree_skb(skb);
281 }
282
283 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
284 {
285 struct ipv6_pinfo *np = inet6_sk(sk);
286 struct ipv6hdr *iph;
287 struct sk_buff *skb;
288 struct ip6_mtuinfo *mtu_info;
289
290 if (!np->rxopt.bits.rxpmtu)
291 return;
292
293 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
294 if (!skb)
295 return;
296
297 skb_put(skb, sizeof(struct ipv6hdr));
298 skb_reset_network_header(skb);
299 iph = ipv6_hdr(skb);
300 iph->daddr = fl6->daddr;
301
302 mtu_info = IP6CBMTU(skb);
303
304 mtu_info->ip6m_mtu = mtu;
305 mtu_info->ip6m_addr.sin6_family = AF_INET6;
306 mtu_info->ip6m_addr.sin6_port = 0;
307 mtu_info->ip6m_addr.sin6_flowinfo = 0;
308 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
309 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
310
311 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
312 skb_reset_transport_header(skb);
313
314 skb = xchg(&np->rxpmtu, skb);
315 kfree_skb(skb);
316 }
317
318 /*
319 * Handle MSG_ERRQUEUE
320 */
321 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
322 {
323 struct ipv6_pinfo *np = inet6_sk(sk);
324 struct sock_exterr_skb *serr;
325 struct sk_buff *skb, *skb2;
326 struct sockaddr_in6 *sin;
327 struct {
328 struct sock_extended_err ee;
329 struct sockaddr_in6 offender;
330 } errhdr;
331 int err;
332 int copied;
333
334 err = -EAGAIN;
335 skb = skb_dequeue(&sk->sk_error_queue);
336 if (skb == NULL)
337 goto out;
338
339 copied = skb->len;
340 if (copied > len) {
341 msg->msg_flags |= MSG_TRUNC;
342 copied = len;
343 }
344 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
345 if (err)
346 goto out_free_skb;
347
348 sock_recv_timestamp(msg, sk, skb);
349
350 serr = SKB_EXT_ERR(skb);
351
352 sin = (struct sockaddr_in6 *)msg->msg_name;
353 if (sin) {
354 const unsigned char *nh = skb_network_header(skb);
355 sin->sin6_family = AF_INET6;
356 sin->sin6_flowinfo = 0;
357 sin->sin6_port = serr->port;
358 if (skb->protocol == htons(ETH_P_IPV6)) {
359 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
360 struct ipv6hdr, daddr);
361 sin->sin6_addr = ip6h->daddr;
362 if (np->sndflow)
363 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
364 sin->sin6_scope_id =
365 ipv6_iface_scope_id(&sin->sin6_addr,
366 IP6CB(skb)->iif);
367 } else {
368 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
369 &sin->sin6_addr);
370 sin->sin6_scope_id = 0;
371 }
372 }
373
374 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
375 sin = &errhdr.offender;
376 sin->sin6_family = AF_UNSPEC;
377 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
378 sin->sin6_family = AF_INET6;
379 sin->sin6_flowinfo = 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 sin->sin6_scope_id =
385 ipv6_iface_scope_id(&sin->sin6_addr,
386 IP6CB(skb)->iif);
387 } else {
388 struct inet_sock *inet = inet_sk(sk);
389
390 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
391 &sin->sin6_addr);
392 sin->sin6_scope_id = 0;
393 if (inet->cmsg_flags)
394 ip_cmsg_recv(msg, skb);
395 }
396 }
397
398 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
399
400 /* Now we could try to dump offended packet options */
401
402 msg->msg_flags |= MSG_ERRQUEUE;
403 err = copied;
404
405 /* Reset and regenerate socket error */
406 spin_lock_bh(&sk->sk_error_queue.lock);
407 sk->sk_err = 0;
408 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
409 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
410 spin_unlock_bh(&sk->sk_error_queue.lock);
411 sk->sk_error_report(sk);
412 } else {
413 spin_unlock_bh(&sk->sk_error_queue.lock);
414 }
415
416 out_free_skb:
417 kfree_skb(skb);
418 out:
419 return err;
420 }
421 EXPORT_SYMBOL_GPL(ipv6_recv_error);
422
423 /*
424 * Handle IPV6_RECVPATHMTU
425 */
426 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len)
427 {
428 struct ipv6_pinfo *np = inet6_sk(sk);
429 struct sk_buff *skb;
430 struct sockaddr_in6 *sin;
431 struct ip6_mtuinfo mtu_info;
432 int err;
433 int copied;
434
435 err = -EAGAIN;
436 skb = xchg(&np->rxpmtu, NULL);
437 if (skb == NULL)
438 goto out;
439
440 copied = skb->len;
441 if (copied > len) {
442 msg->msg_flags |= MSG_TRUNC;
443 copied = len;
444 }
445 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
446 if (err)
447 goto out_free_skb;
448
449 sock_recv_timestamp(msg, sk, skb);
450
451 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
452
453 sin = (struct sockaddr_in6 *)msg->msg_name;
454 if (sin) {
455 sin->sin6_family = AF_INET6;
456 sin->sin6_flowinfo = 0;
457 sin->sin6_port = 0;
458 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
459 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
460 }
461
462 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
463
464 err = copied;
465
466 out_free_skb:
467 kfree_skb(skb);
468 out:
469 return err;
470 }
471
472
473 int ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
474 struct sk_buff *skb)
475 {
476 struct ipv6_pinfo *np = inet6_sk(sk);
477 struct inet6_skb_parm *opt = IP6CB(skb);
478 unsigned char *nh = skb_network_header(skb);
479
480 if (np->rxopt.bits.rxinfo) {
481 struct in6_pktinfo src_info;
482
483 src_info.ipi6_ifindex = opt->iif;
484 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
485 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
486 }
487
488 if (np->rxopt.bits.rxhlim) {
489 int hlim = ipv6_hdr(skb)->hop_limit;
490 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
491 }
492
493 if (np->rxopt.bits.rxtclass) {
494 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
495 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
496 }
497
498 if (np->rxopt.bits.rxflow) {
499 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
500 if (flowinfo)
501 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
502 }
503
504 /* HbH is allowed only once */
505 if (np->rxopt.bits.hopopts && opt->hop) {
506 u8 *ptr = nh + opt->hop;
507 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
508 }
509
510 if (opt->lastopt &&
511 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
512 /*
513 * Silly enough, but we need to reparse in order to
514 * report extension headers (except for HbH)
515 * in order.
516 *
517 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
518 * (and WILL NOT be) defined because
519 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
520 */
521 unsigned int off = sizeof(struct ipv6hdr);
522 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
523
524 while (off <= opt->lastopt) {
525 unsigned int len;
526 u8 *ptr = nh + off;
527
528 switch (nexthdr) {
529 case IPPROTO_DSTOPTS:
530 nexthdr = ptr[0];
531 len = (ptr[1] + 1) << 3;
532 if (np->rxopt.bits.dstopts)
533 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
534 break;
535 case IPPROTO_ROUTING:
536 nexthdr = ptr[0];
537 len = (ptr[1] + 1) << 3;
538 if (np->rxopt.bits.srcrt)
539 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
540 break;
541 case IPPROTO_AH:
542 nexthdr = ptr[0];
543 len = (ptr[1] + 2) << 2;
544 break;
545 default:
546 nexthdr = ptr[0];
547 len = (ptr[1] + 1) << 3;
548 break;
549 }
550
551 off += len;
552 }
553 }
554
555 /* socket options in old style */
556 if (np->rxopt.bits.rxoinfo) {
557 struct in6_pktinfo src_info;
558
559 src_info.ipi6_ifindex = opt->iif;
560 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
561 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
562 }
563 if (np->rxopt.bits.rxohlim) {
564 int hlim = ipv6_hdr(skb)->hop_limit;
565 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
566 }
567 if (np->rxopt.bits.ohopopts && opt->hop) {
568 u8 *ptr = nh + opt->hop;
569 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
570 }
571 if (np->rxopt.bits.odstopts && opt->dst0) {
572 u8 *ptr = nh + opt->dst0;
573 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
574 }
575 if (np->rxopt.bits.osrcrt && opt->srcrt) {
576 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
577 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
578 }
579 if (np->rxopt.bits.odstopts && opt->dst1) {
580 u8 *ptr = nh + opt->dst1;
581 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
582 }
583 if (np->rxopt.bits.rxorigdstaddr) {
584 struct sockaddr_in6 sin6;
585 __be16 *ports = (__be16 *) skb_transport_header(skb);
586
587 if (skb_transport_offset(skb) + 4 <= skb->len) {
588 /* All current transport protocols have the port numbers in the
589 * first four bytes of the transport header and this function is
590 * written with this assumption in mind.
591 */
592
593 sin6.sin6_family = AF_INET6;
594 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
595 sin6.sin6_port = ports[1];
596 sin6.sin6_flowinfo = 0;
597 sin6.sin6_scope_id =
598 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
599 opt->iif);
600
601 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
602 }
603 }
604 return 0;
605 }
606 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
607
608 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
609 struct msghdr *msg, struct flowi6 *fl6,
610 struct ipv6_txoptions *opt,
611 int *hlimit, int *tclass, int *dontfrag)
612 {
613 struct in6_pktinfo *src_info;
614 struct cmsghdr *cmsg;
615 struct ipv6_rt_hdr *rthdr;
616 struct ipv6_opt_hdr *hdr;
617 int len;
618 int err = 0;
619
620 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
621 int addr_type;
622
623 if (!CMSG_OK(msg, cmsg)) {
624 err = -EINVAL;
625 goto exit_f;
626 }
627
628 if (cmsg->cmsg_level != SOL_IPV6)
629 continue;
630
631 switch (cmsg->cmsg_type) {
632 case IPV6_PKTINFO:
633 case IPV6_2292PKTINFO:
634 {
635 struct net_device *dev = NULL;
636
637 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
638 err = -EINVAL;
639 goto exit_f;
640 }
641
642 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
643
644 if (src_info->ipi6_ifindex) {
645 if (fl6->flowi6_oif &&
646 src_info->ipi6_ifindex != fl6->flowi6_oif)
647 return -EINVAL;
648 fl6->flowi6_oif = src_info->ipi6_ifindex;
649 }
650
651 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
652
653 rcu_read_lock();
654 if (fl6->flowi6_oif) {
655 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
656 if (!dev) {
657 rcu_read_unlock();
658 return -ENODEV;
659 }
660 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
661 rcu_read_unlock();
662 return -EINVAL;
663 }
664
665 if (addr_type != IPV6_ADDR_ANY) {
666 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
667 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
668 !ipv6_chk_addr(net, &src_info->ipi6_addr,
669 strict ? dev : NULL, 0))
670 err = -EINVAL;
671 else
672 fl6->saddr = src_info->ipi6_addr;
673 }
674
675 rcu_read_unlock();
676
677 if (err)
678 goto exit_f;
679
680 break;
681 }
682
683 case IPV6_FLOWINFO:
684 if (cmsg->cmsg_len < CMSG_LEN(4)) {
685 err = -EINVAL;
686 goto exit_f;
687 }
688
689 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
690 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
691 err = -EINVAL;
692 goto exit_f;
693 }
694 }
695 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
696 break;
697
698 case IPV6_2292HOPOPTS:
699 case IPV6_HOPOPTS:
700 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
701 err = -EINVAL;
702 goto exit_f;
703 }
704
705 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
706 len = ((hdr->hdrlen + 1) << 3);
707 if (cmsg->cmsg_len < CMSG_LEN(len)) {
708 err = -EINVAL;
709 goto exit_f;
710 }
711 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
712 err = -EPERM;
713 goto exit_f;
714 }
715 opt->opt_nflen += len;
716 opt->hopopt = hdr;
717 break;
718
719 case IPV6_2292DSTOPTS:
720 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
721 err = -EINVAL;
722 goto exit_f;
723 }
724
725 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
726 len = ((hdr->hdrlen + 1) << 3);
727 if (cmsg->cmsg_len < CMSG_LEN(len)) {
728 err = -EINVAL;
729 goto exit_f;
730 }
731 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
732 err = -EPERM;
733 goto exit_f;
734 }
735 if (opt->dst1opt) {
736 err = -EINVAL;
737 goto exit_f;
738 }
739 opt->opt_flen += len;
740 opt->dst1opt = hdr;
741 break;
742
743 case IPV6_DSTOPTS:
744 case IPV6_RTHDRDSTOPTS:
745 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
746 err = -EINVAL;
747 goto exit_f;
748 }
749
750 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
751 len = ((hdr->hdrlen + 1) << 3);
752 if (cmsg->cmsg_len < CMSG_LEN(len)) {
753 err = -EINVAL;
754 goto exit_f;
755 }
756 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
757 err = -EPERM;
758 goto exit_f;
759 }
760 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
761 opt->opt_flen += len;
762 opt->dst1opt = hdr;
763 } else {
764 opt->opt_nflen += len;
765 opt->dst0opt = hdr;
766 }
767 break;
768
769 case IPV6_2292RTHDR:
770 case IPV6_RTHDR:
771 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
772 err = -EINVAL;
773 goto exit_f;
774 }
775
776 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
777
778 switch (rthdr->type) {
779 #if IS_ENABLED(CONFIG_IPV6_MIP6)
780 case IPV6_SRCRT_TYPE_2:
781 if (rthdr->hdrlen != 2 ||
782 rthdr->segments_left != 1) {
783 err = -EINVAL;
784 goto exit_f;
785 }
786 break;
787 #endif
788 default:
789 err = -EINVAL;
790 goto exit_f;
791 }
792
793 len = ((rthdr->hdrlen + 1) << 3);
794
795 if (cmsg->cmsg_len < CMSG_LEN(len)) {
796 err = -EINVAL;
797 goto exit_f;
798 }
799
800 /* segments left must also match */
801 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
802 err = -EINVAL;
803 goto exit_f;
804 }
805
806 opt->opt_nflen += len;
807 opt->srcrt = rthdr;
808
809 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
810 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
811
812 opt->opt_nflen += dsthdrlen;
813 opt->dst0opt = opt->dst1opt;
814 opt->dst1opt = NULL;
815 opt->opt_flen -= dsthdrlen;
816 }
817
818 break;
819
820 case IPV6_2292HOPLIMIT:
821 case IPV6_HOPLIMIT:
822 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
823 err = -EINVAL;
824 goto exit_f;
825 }
826
827 *hlimit = *(int *)CMSG_DATA(cmsg);
828 if (*hlimit < -1 || *hlimit > 0xff) {
829 err = -EINVAL;
830 goto exit_f;
831 }
832
833 break;
834
835 case IPV6_TCLASS:
836 {
837 int tc;
838
839 err = -EINVAL;
840 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
841 goto exit_f;
842
843 tc = *(int *)CMSG_DATA(cmsg);
844 if (tc < -1 || tc > 0xff)
845 goto exit_f;
846
847 err = 0;
848 *tclass = tc;
849
850 break;
851 }
852
853 case IPV6_DONTFRAG:
854 {
855 int df;
856
857 err = -EINVAL;
858 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
859 goto exit_f;
860
861 df = *(int *)CMSG_DATA(cmsg);
862 if (df < 0 || df > 1)
863 goto exit_f;
864
865 err = 0;
866 *dontfrag = df;
867
868 break;
869 }
870 default:
871 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
872 cmsg->cmsg_type);
873 err = -EINVAL;
874 goto exit_f;
875 }
876 }
877
878 exit_f:
879 return err;
880 }
881 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
kernel source for telekom puls (alcatel/mediatek)