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netfilter: nf_conntrack: refactor l3proto support for netns
[deliverable/linux.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 (addr_type&IPV6_ADDR_LINKLOCAL) {
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 sin->sin6_scope_id = 0;
359 if (skb->protocol == htons(ETH_P_IPV6)) {
360 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
361 struct ipv6hdr, daddr);
362 sin->sin6_addr = ip6h->daddr;
363 if (np->sndflow)
364 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
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 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 datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
472 {
473 struct ipv6_pinfo *np = inet6_sk(sk);
474 struct inet6_skb_parm *opt = IP6CB(skb);
475 unsigned char *nh = skb_network_header(skb);
476
477 if (np->rxopt.bits.rxinfo) {
478 struct in6_pktinfo src_info;
479
480 src_info.ipi6_ifindex = opt->iif;
481 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
482 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
483 }
484
485 if (np->rxopt.bits.rxhlim) {
486 int hlim = ipv6_hdr(skb)->hop_limit;
487 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
488 }
489
490 if (np->rxopt.bits.rxtclass) {
491 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
492 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
493 }
494
495 if (np->rxopt.bits.rxflow) {
496 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
497 if (flowinfo)
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
602 int datagram_send_ctl(struct net *net, struct sock *sk,
603 struct msghdr *msg, struct flowi6 *fl6,
604 struct ipv6_txoptions *opt,
605 int *hlimit, int *tclass, int *dontfrag)
606 {
607 struct in6_pktinfo *src_info;
608 struct cmsghdr *cmsg;
609 struct ipv6_rt_hdr *rthdr;
610 struct ipv6_opt_hdr *hdr;
611 int len;
612 int err = 0;
613
614 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
615 int addr_type;
616
617 if (!CMSG_OK(msg, cmsg)) {
618 err = -EINVAL;
619 goto exit_f;
620 }
621
622 if (cmsg->cmsg_level != SOL_IPV6)
623 continue;
624
625 switch (cmsg->cmsg_type) {
626 case IPV6_PKTINFO:
627 case IPV6_2292PKTINFO:
628 {
629 struct net_device *dev = NULL;
630
631 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
632 err = -EINVAL;
633 goto exit_f;
634 }
635
636 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
637
638 if (src_info->ipi6_ifindex) {
639 if (fl6->flowi6_oif &&
640 src_info->ipi6_ifindex != fl6->flowi6_oif)
641 return -EINVAL;
642 fl6->flowi6_oif = src_info->ipi6_ifindex;
643 }
644
645 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
646
647 rcu_read_lock();
648 if (fl6->flowi6_oif) {
649 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
650 if (!dev) {
651 rcu_read_unlock();
652 return -ENODEV;
653 }
654 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
655 rcu_read_unlock();
656 return -EINVAL;
657 }
658
659 if (addr_type != IPV6_ADDR_ANY) {
660 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
661 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
662 !ipv6_chk_addr(net, &src_info->ipi6_addr,
663 strict ? dev : NULL, 0))
664 err = -EINVAL;
665 else
666 fl6->saddr = src_info->ipi6_addr;
667 }
668
669 rcu_read_unlock();
670
671 if (err)
672 goto exit_f;
673
674 break;
675 }
676
677 case IPV6_FLOWINFO:
678 if (cmsg->cmsg_len < CMSG_LEN(4)) {
679 err = -EINVAL;
680 goto exit_f;
681 }
682
683 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
684 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
685 err = -EINVAL;
686 goto exit_f;
687 }
688 }
689 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
690 break;
691
692 case IPV6_2292HOPOPTS:
693 case IPV6_HOPOPTS:
694 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
695 err = -EINVAL;
696 goto exit_f;
697 }
698
699 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
700 len = ((hdr->hdrlen + 1) << 3);
701 if (cmsg->cmsg_len < CMSG_LEN(len)) {
702 err = -EINVAL;
703 goto exit_f;
704 }
705 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
706 err = -EPERM;
707 goto exit_f;
708 }
709 opt->opt_nflen += len;
710 opt->hopopt = hdr;
711 break;
712
713 case IPV6_2292DSTOPTS:
714 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
715 err = -EINVAL;
716 goto exit_f;
717 }
718
719 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
720 len = ((hdr->hdrlen + 1) << 3);
721 if (cmsg->cmsg_len < CMSG_LEN(len)) {
722 err = -EINVAL;
723 goto exit_f;
724 }
725 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
726 err = -EPERM;
727 goto exit_f;
728 }
729 if (opt->dst1opt) {
730 err = -EINVAL;
731 goto exit_f;
732 }
733 opt->opt_flen += len;
734 opt->dst1opt = hdr;
735 break;
736
737 case IPV6_DSTOPTS:
738 case IPV6_RTHDRDSTOPTS:
739 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
740 err = -EINVAL;
741 goto exit_f;
742 }
743
744 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
745 len = ((hdr->hdrlen + 1) << 3);
746 if (cmsg->cmsg_len < CMSG_LEN(len)) {
747 err = -EINVAL;
748 goto exit_f;
749 }
750 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
751 err = -EPERM;
752 goto exit_f;
753 }
754 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
755 opt->opt_flen += len;
756 opt->dst1opt = hdr;
757 } else {
758 opt->opt_nflen += len;
759 opt->dst0opt = hdr;
760 }
761 break;
762
763 case IPV6_2292RTHDR:
764 case IPV6_RTHDR:
765 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
766 err = -EINVAL;
767 goto exit_f;
768 }
769
770 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
771
772 switch (rthdr->type) {
773 #if IS_ENABLED(CONFIG_IPV6_MIP6)
774 case IPV6_SRCRT_TYPE_2:
775 if (rthdr->hdrlen != 2 ||
776 rthdr->segments_left != 1) {
777 err = -EINVAL;
778 goto exit_f;
779 }
780 break;
781 #endif
782 default:
783 err = -EINVAL;
784 goto exit_f;
785 }
786
787 len = ((rthdr->hdrlen + 1) << 3);
788
789 if (cmsg->cmsg_len < CMSG_LEN(len)) {
790 err = -EINVAL;
791 goto exit_f;
792 }
793
794 /* segments left must also match */
795 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
796 err = -EINVAL;
797 goto exit_f;
798 }
799
800 opt->opt_nflen += len;
801 opt->srcrt = rthdr;
802
803 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
804 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
805
806 opt->opt_nflen += dsthdrlen;
807 opt->dst0opt = opt->dst1opt;
808 opt->dst1opt = NULL;
809 opt->opt_flen -= dsthdrlen;
810 }
811
812 break;
813
814 case IPV6_2292HOPLIMIT:
815 case IPV6_HOPLIMIT:
816 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
817 err = -EINVAL;
818 goto exit_f;
819 }
820
821 *hlimit = *(int *)CMSG_DATA(cmsg);
822 if (*hlimit < -1 || *hlimit > 0xff) {
823 err = -EINVAL;
824 goto exit_f;
825 }
826
827 break;
828
829 case IPV6_TCLASS:
830 {
831 int tc;
832
833 err = -EINVAL;
834 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
835 goto exit_f;
836
837 tc = *(int *)CMSG_DATA(cmsg);
838 if (tc < -1 || tc > 0xff)
839 goto exit_f;
840
841 err = 0;
842 *tclass = tc;
843
844 break;
845 }
846
847 case IPV6_DONTFRAG:
848 {
849 int df;
850
851 err = -EINVAL;
852 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
853 goto exit_f;
854
855 df = *(int *)CMSG_DATA(cmsg);
856 if (df < 0 || df > 1)
857 goto exit_f;
858
859 err = 0;
860 *dontfrag = df;
861
862 break;
863 }
864 default:
865 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
866 cmsg->cmsg_type);
867 err = -EINVAL;
868 goto exit_f;
869 }
870 }
871
872 exit_f:
873 return err;
874 }
875 EXPORT_SYMBOL_GPL(datagram_send_ctl);
Linux kernel - Deliverables
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