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[mirror_ubuntu-zesty-kernel.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 }
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, &sk->sk_v6_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(&sk->sk_v6_rcv_saddr) ||
116 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
117 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
118 &sk->sk_v6_rcv_saddr);
119 if (sk->sk_prot->rehash)
120 sk->sk_prot->rehash(sk);
121 }
122
123 goto out;
124 }
125
126 if (__ipv6_addr_needs_scope_id(addr_type)) {
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 sk->sk_v6_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 = sk->sk_v6_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);
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(&sk->sk_v6_rcv_saddr)) {
186 sk->sk_v6_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, &sk->sk_v6_daddr) ?
194 &sk->sk_v6_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 ip6_set_txhash(sk);
203 out:
204 fl6_sock_release(flowlabel);
205 return err;
206 }
207 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
208
209 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
210 int addr_len)
211 {
212 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
213 if (sin6->sin6_family != AF_INET6)
214 return -EAFNOSUPPORT;
215 return ip6_datagram_connect(sk, uaddr, addr_len);
216 }
217 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
218
219 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
220 __be16 port, u32 info, u8 *payload)
221 {
222 struct ipv6_pinfo *np = inet6_sk(sk);
223 struct icmp6hdr *icmph = icmp6_hdr(skb);
224 struct sock_exterr_skb *serr;
225
226 if (!np->recverr)
227 return;
228
229 skb = skb_clone(skb, GFP_ATOMIC);
230 if (!skb)
231 return;
232
233 skb->protocol = htons(ETH_P_IPV6);
234
235 serr = SKB_EXT_ERR(skb);
236 serr->ee.ee_errno = err;
237 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
238 serr->ee.ee_type = icmph->icmp6_type;
239 serr->ee.ee_code = icmph->icmp6_code;
240 serr->ee.ee_pad = 0;
241 serr->ee.ee_info = info;
242 serr->ee.ee_data = 0;
243 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
244 skb_network_header(skb);
245 serr->port = port;
246
247 __skb_pull(skb, payload - skb->data);
248 skb_reset_transport_header(skb);
249
250 if (sock_queue_err_skb(sk, skb))
251 kfree_skb(skb);
252 }
253
254 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
255 {
256 struct ipv6_pinfo *np = inet6_sk(sk);
257 struct sock_exterr_skb *serr;
258 struct ipv6hdr *iph;
259 struct sk_buff *skb;
260
261 if (!np->recverr)
262 return;
263
264 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
265 if (!skb)
266 return;
267
268 skb->protocol = htons(ETH_P_IPV6);
269
270 skb_put(skb, sizeof(struct ipv6hdr));
271 skb_reset_network_header(skb);
272 iph = ipv6_hdr(skb);
273 iph->daddr = fl6->daddr;
274
275 serr = SKB_EXT_ERR(skb);
276 serr->ee.ee_errno = err;
277 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
278 serr->ee.ee_type = 0;
279 serr->ee.ee_code = 0;
280 serr->ee.ee_pad = 0;
281 serr->ee.ee_info = info;
282 serr->ee.ee_data = 0;
283 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
284 serr->port = fl6->fl6_dport;
285
286 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
287 skb_reset_transport_header(skb);
288
289 if (sock_queue_err_skb(sk, skb))
290 kfree_skb(skb);
291 }
292
293 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
294 {
295 struct ipv6_pinfo *np = inet6_sk(sk);
296 struct ipv6hdr *iph;
297 struct sk_buff *skb;
298 struct ip6_mtuinfo *mtu_info;
299
300 if (!np->rxopt.bits.rxpmtu)
301 return;
302
303 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
304 if (!skb)
305 return;
306
307 skb_put(skb, sizeof(struct ipv6hdr));
308 skb_reset_network_header(skb);
309 iph = ipv6_hdr(skb);
310 iph->daddr = fl6->daddr;
311
312 mtu_info = IP6CBMTU(skb);
313
314 mtu_info->ip6m_mtu = mtu;
315 mtu_info->ip6m_addr.sin6_family = AF_INET6;
316 mtu_info->ip6m_addr.sin6_port = 0;
317 mtu_info->ip6m_addr.sin6_flowinfo = 0;
318 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
319 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
320
321 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
322 skb_reset_transport_header(skb);
323
324 skb = xchg(&np->rxpmtu, skb);
325 kfree_skb(skb);
326 }
327
328 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
329 *
330 * At one point, excluding local errors was a quick test to identify icmp/icmp6
331 * errors. This is no longer true, but the test remained, so the v6 stack,
332 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
333 *
334 * Timestamp code paths do not initialize the fields expected by cmsg:
335 * the PKTINFO fields in skb->cb[]. Fill those in here.
336 */
337 static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
338 struct sock_exterr_skb *serr)
339 {
340 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
341 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
342 return true;
343
344 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
345 return false;
346
347 if (!skb->dev)
348 return false;
349
350 if (skb->protocol == htons(ETH_P_IPV6))
351 IP6CB(skb)->iif = skb->dev->ifindex;
352 else
353 PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex;
354
355 return true;
356 }
357
358 /*
359 * Handle MSG_ERRQUEUE
360 */
361 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
362 {
363 struct ipv6_pinfo *np = inet6_sk(sk);
364 struct sock_exterr_skb *serr;
365 struct sk_buff *skb;
366 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
367 struct {
368 struct sock_extended_err ee;
369 struct sockaddr_in6 offender;
370 } errhdr;
371 int err;
372 int copied;
373
374 err = -EAGAIN;
375 skb = sock_dequeue_err_skb(sk);
376 if (skb == NULL)
377 goto out;
378
379 copied = skb->len;
380 if (copied > len) {
381 msg->msg_flags |= MSG_TRUNC;
382 copied = len;
383 }
384 err = skb_copy_datagram_msg(skb, 0, msg, copied);
385 if (err)
386 goto out_free_skb;
387
388 sock_recv_timestamp(msg, sk, skb);
389
390 serr = SKB_EXT_ERR(skb);
391
392 if (sin && serr->port) {
393 const unsigned char *nh = skb_network_header(skb);
394 sin->sin6_family = AF_INET6;
395 sin->sin6_flowinfo = 0;
396 sin->sin6_port = serr->port;
397 if (skb->protocol == htons(ETH_P_IPV6)) {
398 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
399 struct ipv6hdr, daddr);
400 sin->sin6_addr = ip6h->daddr;
401 if (np->sndflow)
402 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
403 sin->sin6_scope_id =
404 ipv6_iface_scope_id(&sin->sin6_addr,
405 IP6CB(skb)->iif);
406 } else {
407 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
408 &sin->sin6_addr);
409 sin->sin6_scope_id = 0;
410 }
411 *addr_len = sizeof(*sin);
412 }
413
414 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
415 sin = &errhdr.offender;
416 memset(sin, 0, sizeof(*sin));
417
418 if (ip6_datagram_support_cmsg(skb, serr)) {
419 sin->sin6_family = AF_INET6;
420 if (np->rxopt.all)
421 ip6_datagram_recv_common_ctl(sk, msg, skb);
422 if (skb->protocol == htons(ETH_P_IPV6)) {
423 sin->sin6_addr = ipv6_hdr(skb)->saddr;
424 if (np->rxopt.all)
425 ip6_datagram_recv_specific_ctl(sk, msg, skb);
426 sin->sin6_scope_id =
427 ipv6_iface_scope_id(&sin->sin6_addr,
428 IP6CB(skb)->iif);
429 } else {
430 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
431 &sin->sin6_addr);
432 if (inet_sk(sk)->cmsg_flags)
433 ip_cmsg_recv(msg, skb);
434 }
435 }
436
437 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
438
439 /* Now we could try to dump offended packet options */
440
441 msg->msg_flags |= MSG_ERRQUEUE;
442 err = copied;
443
444 out_free_skb:
445 kfree_skb(skb);
446 out:
447 return err;
448 }
449 EXPORT_SYMBOL_GPL(ipv6_recv_error);
450
451 /*
452 * Handle IPV6_RECVPATHMTU
453 */
454 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
455 int *addr_len)
456 {
457 struct ipv6_pinfo *np = inet6_sk(sk);
458 struct sk_buff *skb;
459 struct ip6_mtuinfo mtu_info;
460 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
461 int err;
462 int copied;
463
464 err = -EAGAIN;
465 skb = xchg(&np->rxpmtu, NULL);
466 if (skb == NULL)
467 goto out;
468
469 copied = skb->len;
470 if (copied > len) {
471 msg->msg_flags |= MSG_TRUNC;
472 copied = len;
473 }
474 err = skb_copy_datagram_msg(skb, 0, msg, copied);
475 if (err)
476 goto out_free_skb;
477
478 sock_recv_timestamp(msg, sk, skb);
479
480 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
481
482 if (sin) {
483 sin->sin6_family = AF_INET6;
484 sin->sin6_flowinfo = 0;
485 sin->sin6_port = 0;
486 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
487 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
488 *addr_len = sizeof(*sin);
489 }
490
491 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
492
493 err = copied;
494
495 out_free_skb:
496 kfree_skb(skb);
497 out:
498 return err;
499 }
500
501
502 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
503 struct sk_buff *skb)
504 {
505 struct ipv6_pinfo *np = inet6_sk(sk);
506 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
507
508 if (np->rxopt.bits.rxinfo) {
509 struct in6_pktinfo src_info;
510
511 if (is_ipv6) {
512 src_info.ipi6_ifindex = IP6CB(skb)->iif;
513 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
514 } else {
515 src_info.ipi6_ifindex =
516 PKTINFO_SKB_CB(skb)->ipi_ifindex;
517 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
518 &src_info.ipi6_addr);
519 }
520
521 if (src_info.ipi6_ifindex >= 0)
522 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
523 sizeof(src_info), &src_info);
524 }
525 }
526
527 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
528 struct sk_buff *skb)
529 {
530 struct ipv6_pinfo *np = inet6_sk(sk);
531 struct inet6_skb_parm *opt = IP6CB(skb);
532 unsigned char *nh = skb_network_header(skb);
533
534 if (np->rxopt.bits.rxhlim) {
535 int hlim = ipv6_hdr(skb)->hop_limit;
536 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
537 }
538
539 if (np->rxopt.bits.rxtclass) {
540 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
541 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
542 }
543
544 if (np->rxopt.bits.rxflow) {
545 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
546 if (flowinfo)
547 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
548 }
549
550 /* HbH is allowed only once */
551 if (np->rxopt.bits.hopopts && opt->hop) {
552 u8 *ptr = nh + opt->hop;
553 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
554 }
555
556 if (opt->lastopt &&
557 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
558 /*
559 * Silly enough, but we need to reparse in order to
560 * report extension headers (except for HbH)
561 * in order.
562 *
563 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
564 * (and WILL NOT be) defined because
565 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
566 */
567 unsigned int off = sizeof(struct ipv6hdr);
568 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
569
570 while (off <= opt->lastopt) {
571 unsigned int len;
572 u8 *ptr = nh + off;
573
574 switch (nexthdr) {
575 case IPPROTO_DSTOPTS:
576 nexthdr = ptr[0];
577 len = (ptr[1] + 1) << 3;
578 if (np->rxopt.bits.dstopts)
579 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
580 break;
581 case IPPROTO_ROUTING:
582 nexthdr = ptr[0];
583 len = (ptr[1] + 1) << 3;
584 if (np->rxopt.bits.srcrt)
585 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
586 break;
587 case IPPROTO_AH:
588 nexthdr = ptr[0];
589 len = (ptr[1] + 2) << 2;
590 break;
591 default:
592 nexthdr = ptr[0];
593 len = (ptr[1] + 1) << 3;
594 break;
595 }
596
597 off += len;
598 }
599 }
600
601 /* socket options in old style */
602 if (np->rxopt.bits.rxoinfo) {
603 struct in6_pktinfo src_info;
604
605 src_info.ipi6_ifindex = opt->iif;
606 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
607 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
608 }
609 if (np->rxopt.bits.rxohlim) {
610 int hlim = ipv6_hdr(skb)->hop_limit;
611 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
612 }
613 if (np->rxopt.bits.ohopopts && opt->hop) {
614 u8 *ptr = nh + opt->hop;
615 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
616 }
617 if (np->rxopt.bits.odstopts && opt->dst0) {
618 u8 *ptr = nh + opt->dst0;
619 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
620 }
621 if (np->rxopt.bits.osrcrt && opt->srcrt) {
622 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
623 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
624 }
625 if (np->rxopt.bits.odstopts && opt->dst1) {
626 u8 *ptr = nh + opt->dst1;
627 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
628 }
629 if (np->rxopt.bits.rxorigdstaddr) {
630 struct sockaddr_in6 sin6;
631 __be16 *ports = (__be16 *) skb_transport_header(skb);
632
633 if (skb_transport_offset(skb) + 4 <= skb->len) {
634 /* All current transport protocols have the port numbers in the
635 * first four bytes of the transport header and this function is
636 * written with this assumption in mind.
637 */
638
639 sin6.sin6_family = AF_INET6;
640 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
641 sin6.sin6_port = ports[1];
642 sin6.sin6_flowinfo = 0;
643 sin6.sin6_scope_id =
644 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
645 opt->iif);
646
647 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
648 }
649 }
650 }
651
652 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
653 struct sk_buff *skb)
654 {
655 ip6_datagram_recv_common_ctl(sk, msg, skb);
656 ip6_datagram_recv_specific_ctl(sk, msg, skb);
657 }
658 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
659
660 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
661 struct msghdr *msg, struct flowi6 *fl6,
662 struct ipv6_txoptions *opt,
663 int *hlimit, int *tclass, int *dontfrag)
664 {
665 struct in6_pktinfo *src_info;
666 struct cmsghdr *cmsg;
667 struct ipv6_rt_hdr *rthdr;
668 struct ipv6_opt_hdr *hdr;
669 int len;
670 int err = 0;
671
672 for_each_cmsghdr(cmsg, msg) {
673 int addr_type;
674
675 if (!CMSG_OK(msg, cmsg)) {
676 err = -EINVAL;
677 goto exit_f;
678 }
679
680 if (cmsg->cmsg_level != SOL_IPV6)
681 continue;
682
683 switch (cmsg->cmsg_type) {
684 case IPV6_PKTINFO:
685 case IPV6_2292PKTINFO:
686 {
687 struct net_device *dev = NULL;
688
689 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
690 err = -EINVAL;
691 goto exit_f;
692 }
693
694 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
695
696 if (src_info->ipi6_ifindex) {
697 if (fl6->flowi6_oif &&
698 src_info->ipi6_ifindex != fl6->flowi6_oif)
699 return -EINVAL;
700 fl6->flowi6_oif = src_info->ipi6_ifindex;
701 }
702
703 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
704
705 rcu_read_lock();
706 if (fl6->flowi6_oif) {
707 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
708 if (!dev) {
709 rcu_read_unlock();
710 return -ENODEV;
711 }
712 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
713 rcu_read_unlock();
714 return -EINVAL;
715 }
716
717 if (addr_type != IPV6_ADDR_ANY) {
718 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
719 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
720 !ipv6_chk_addr(net, &src_info->ipi6_addr,
721 strict ? dev : NULL, 0) &&
722 !ipv6_chk_acast_addr_src(net, dev,
723 &src_info->ipi6_addr))
724 err = -EINVAL;
725 else
726 fl6->saddr = src_info->ipi6_addr;
727 }
728
729 rcu_read_unlock();
730
731 if (err)
732 goto exit_f;
733
734 break;
735 }
736
737 case IPV6_FLOWINFO:
738 if (cmsg->cmsg_len < CMSG_LEN(4)) {
739 err = -EINVAL;
740 goto exit_f;
741 }
742
743 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
744 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
745 err = -EINVAL;
746 goto exit_f;
747 }
748 }
749 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
750 break;
751
752 case IPV6_2292HOPOPTS:
753 case IPV6_HOPOPTS:
754 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
755 err = -EINVAL;
756 goto exit_f;
757 }
758
759 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
760 len = ((hdr->hdrlen + 1) << 3);
761 if (cmsg->cmsg_len < CMSG_LEN(len)) {
762 err = -EINVAL;
763 goto exit_f;
764 }
765 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
766 err = -EPERM;
767 goto exit_f;
768 }
769 opt->opt_nflen += len;
770 opt->hopopt = hdr;
771 break;
772
773 case IPV6_2292DSTOPTS:
774 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
775 err = -EINVAL;
776 goto exit_f;
777 }
778
779 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
780 len = ((hdr->hdrlen + 1) << 3);
781 if (cmsg->cmsg_len < CMSG_LEN(len)) {
782 err = -EINVAL;
783 goto exit_f;
784 }
785 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
786 err = -EPERM;
787 goto exit_f;
788 }
789 if (opt->dst1opt) {
790 err = -EINVAL;
791 goto exit_f;
792 }
793 opt->opt_flen += len;
794 opt->dst1opt = hdr;
795 break;
796
797 case IPV6_DSTOPTS:
798 case IPV6_RTHDRDSTOPTS:
799 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
800 err = -EINVAL;
801 goto exit_f;
802 }
803
804 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
805 len = ((hdr->hdrlen + 1) << 3);
806 if (cmsg->cmsg_len < CMSG_LEN(len)) {
807 err = -EINVAL;
808 goto exit_f;
809 }
810 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
811 err = -EPERM;
812 goto exit_f;
813 }
814 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
815 opt->opt_flen += len;
816 opt->dst1opt = hdr;
817 } else {
818 opt->opt_nflen += len;
819 opt->dst0opt = hdr;
820 }
821 break;
822
823 case IPV6_2292RTHDR:
824 case IPV6_RTHDR:
825 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
826 err = -EINVAL;
827 goto exit_f;
828 }
829
830 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
831
832 switch (rthdr->type) {
833 #if IS_ENABLED(CONFIG_IPV6_MIP6)
834 case IPV6_SRCRT_TYPE_2:
835 if (rthdr->hdrlen != 2 ||
836 rthdr->segments_left != 1) {
837 err = -EINVAL;
838 goto exit_f;
839 }
840 break;
841 #endif
842 default:
843 err = -EINVAL;
844 goto exit_f;
845 }
846
847 len = ((rthdr->hdrlen + 1) << 3);
848
849 if (cmsg->cmsg_len < CMSG_LEN(len)) {
850 err = -EINVAL;
851 goto exit_f;
852 }
853
854 /* segments left must also match */
855 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
856 err = -EINVAL;
857 goto exit_f;
858 }
859
860 opt->opt_nflen += len;
861 opt->srcrt = rthdr;
862
863 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
864 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
865
866 opt->opt_nflen += dsthdrlen;
867 opt->dst0opt = opt->dst1opt;
868 opt->dst1opt = NULL;
869 opt->opt_flen -= dsthdrlen;
870 }
871
872 break;
873
874 case IPV6_2292HOPLIMIT:
875 case IPV6_HOPLIMIT:
876 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
877 err = -EINVAL;
878 goto exit_f;
879 }
880
881 *hlimit = *(int *)CMSG_DATA(cmsg);
882 if (*hlimit < -1 || *hlimit > 0xff) {
883 err = -EINVAL;
884 goto exit_f;
885 }
886
887 break;
888
889 case IPV6_TCLASS:
890 {
891 int tc;
892
893 err = -EINVAL;
894 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
895 goto exit_f;
896
897 tc = *(int *)CMSG_DATA(cmsg);
898 if (tc < -1 || tc > 0xff)
899 goto exit_f;
900
901 err = 0;
902 *tclass = tc;
903
904 break;
905 }
906
907 case IPV6_DONTFRAG:
908 {
909 int df;
910
911 err = -EINVAL;
912 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
913 goto exit_f;
914
915 df = *(int *)CMSG_DATA(cmsg);
916 if (df < 0 || df > 1)
917 goto exit_f;
918
919 err = 0;
920 *dontfrag = df;
921
922 break;
923 }
924 default:
925 net_dbg_ratelimited("invalid cmsg type: %d\n",
926 cmsg->cmsg_type);
927 err = -EINVAL;
928 goto exit_f;
929 }
930 }
931
932 exit_f:
933 return err;
934 }
935 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
936
937 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
938 __u16 srcp, __u16 destp, int bucket)
939 {
940 const struct in6_addr *dest, *src;
941
942 dest = &sp->sk_v6_daddr;
943 src = &sp->sk_v6_rcv_saddr;
944 seq_printf(seq,
945 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
946 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
947 bucket,
948 src->s6_addr32[0], src->s6_addr32[1],
949 src->s6_addr32[2], src->s6_addr32[3], srcp,
950 dest->s6_addr32[0], dest->s6_addr32[1],
951 dest->s6_addr32[2], dest->s6_addr32[3], destp,
952 sp->sk_state,
953 sk_wmem_alloc_get(sp),
954 sk_rmem_alloc_get(sp),
955 0, 0L, 0,
956 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
957 0,
958 sock_i_ino(sp),
959 atomic_read(&sp->sk_refcnt), sp,
960 atomic_read(&sp->sk_drops));
961 }
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