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Merge branch 'for-4.1/sensor-hub' into for-linus
[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 static void ip6_datagram_prepare_pktinfo_errqueue(struct sk_buff *skb)
329 {
330 int ifindex = skb->dev ? skb->dev->ifindex : -1;
331
332 if (skb->protocol == htons(ETH_P_IPV6))
333 IP6CB(skb)->iif = ifindex;
334 else
335 PKTINFO_SKB_CB(skb)->ipi_ifindex = ifindex;
336 }
337
338 /*
339 * Handle MSG_ERRQUEUE
340 */
341 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
342 {
343 struct ipv6_pinfo *np = inet6_sk(sk);
344 struct sock_exterr_skb *serr;
345 struct sk_buff *skb;
346 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
347 struct {
348 struct sock_extended_err ee;
349 struct sockaddr_in6 offender;
350 } errhdr;
351 int err;
352 int copied;
353
354 err = -EAGAIN;
355 skb = sock_dequeue_err_skb(sk);
356 if (skb == NULL)
357 goto out;
358
359 copied = skb->len;
360 if (copied > len) {
361 msg->msg_flags |= MSG_TRUNC;
362 copied = len;
363 }
364 err = skb_copy_datagram_msg(skb, 0, msg, copied);
365 if (err)
366 goto out_free_skb;
367
368 sock_recv_timestamp(msg, sk, skb);
369
370 serr = SKB_EXT_ERR(skb);
371
372 if (sin && skb->len) {
373 const unsigned char *nh = skb_network_header(skb);
374 sin->sin6_family = AF_INET6;
375 sin->sin6_flowinfo = 0;
376 sin->sin6_port = serr->port;
377 if (skb->protocol == htons(ETH_P_IPV6)) {
378 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
379 struct ipv6hdr, daddr);
380 sin->sin6_addr = ip6h->daddr;
381 if (np->sndflow)
382 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
383 sin->sin6_scope_id =
384 ipv6_iface_scope_id(&sin->sin6_addr,
385 IP6CB(skb)->iif);
386 } else {
387 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
388 &sin->sin6_addr);
389 sin->sin6_scope_id = 0;
390 }
391 *addr_len = sizeof(*sin);
392 }
393
394 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
395 sin = &errhdr.offender;
396 memset(sin, 0, sizeof(*sin));
397 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL && skb->len) {
398 sin->sin6_family = AF_INET6;
399 if (np->rxopt.all) {
400 if (serr->ee.ee_origin != SO_EE_ORIGIN_ICMP &&
401 serr->ee.ee_origin != SO_EE_ORIGIN_ICMP6)
402 ip6_datagram_prepare_pktinfo_errqueue(skb);
403 ip6_datagram_recv_common_ctl(sk, msg, skb);
404 }
405 if (skb->protocol == htons(ETH_P_IPV6)) {
406 sin->sin6_addr = ipv6_hdr(skb)->saddr;
407 if (np->rxopt.all)
408 ip6_datagram_recv_specific_ctl(sk, msg, skb);
409 sin->sin6_scope_id =
410 ipv6_iface_scope_id(&sin->sin6_addr,
411 IP6CB(skb)->iif);
412 } else {
413 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
414 &sin->sin6_addr);
415 if (inet_sk(sk)->cmsg_flags)
416 ip_cmsg_recv(msg, skb);
417 }
418 }
419
420 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
421
422 /* Now we could try to dump offended packet options */
423
424 msg->msg_flags |= MSG_ERRQUEUE;
425 err = copied;
426
427 out_free_skb:
428 kfree_skb(skb);
429 out:
430 return err;
431 }
432 EXPORT_SYMBOL_GPL(ipv6_recv_error);
433
434 /*
435 * Handle IPV6_RECVPATHMTU
436 */
437 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
438 int *addr_len)
439 {
440 struct ipv6_pinfo *np = inet6_sk(sk);
441 struct sk_buff *skb;
442 struct ip6_mtuinfo mtu_info;
443 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
444 int err;
445 int copied;
446
447 err = -EAGAIN;
448 skb = xchg(&np->rxpmtu, NULL);
449 if (skb == NULL)
450 goto out;
451
452 copied = skb->len;
453 if (copied > len) {
454 msg->msg_flags |= MSG_TRUNC;
455 copied = len;
456 }
457 err = skb_copy_datagram_msg(skb, 0, msg, copied);
458 if (err)
459 goto out_free_skb;
460
461 sock_recv_timestamp(msg, sk, skb);
462
463 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
464
465 if (sin) {
466 sin->sin6_family = AF_INET6;
467 sin->sin6_flowinfo = 0;
468 sin->sin6_port = 0;
469 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
470 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
471 *addr_len = sizeof(*sin);
472 }
473
474 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
475
476 err = copied;
477
478 out_free_skb:
479 kfree_skb(skb);
480 out:
481 return err;
482 }
483
484
485 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
486 struct sk_buff *skb)
487 {
488 struct ipv6_pinfo *np = inet6_sk(sk);
489 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
490
491 if (np->rxopt.bits.rxinfo) {
492 struct in6_pktinfo src_info;
493
494 if (is_ipv6) {
495 src_info.ipi6_ifindex = IP6CB(skb)->iif;
496 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
497 } else {
498 src_info.ipi6_ifindex =
499 PKTINFO_SKB_CB(skb)->ipi_ifindex;
500 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
501 &src_info.ipi6_addr);
502 }
503
504 if (src_info.ipi6_ifindex >= 0)
505 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
506 sizeof(src_info), &src_info);
507 }
508 }
509
510 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
511 struct sk_buff *skb)
512 {
513 struct ipv6_pinfo *np = inet6_sk(sk);
514 struct inet6_skb_parm *opt = IP6CB(skb);
515 unsigned char *nh = skb_network_header(skb);
516
517 if (np->rxopt.bits.rxhlim) {
518 int hlim = ipv6_hdr(skb)->hop_limit;
519 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
520 }
521
522 if (np->rxopt.bits.rxtclass) {
523 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
524 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
525 }
526
527 if (np->rxopt.bits.rxflow) {
528 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
529 if (flowinfo)
530 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
531 }
532
533 /* HbH is allowed only once */
534 if (np->rxopt.bits.hopopts && opt->hop) {
535 u8 *ptr = nh + opt->hop;
536 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
537 }
538
539 if (opt->lastopt &&
540 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
541 /*
542 * Silly enough, but we need to reparse in order to
543 * report extension headers (except for HbH)
544 * in order.
545 *
546 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
547 * (and WILL NOT be) defined because
548 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
549 */
550 unsigned int off = sizeof(struct ipv6hdr);
551 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
552
553 while (off <= opt->lastopt) {
554 unsigned int len;
555 u8 *ptr = nh + off;
556
557 switch (nexthdr) {
558 case IPPROTO_DSTOPTS:
559 nexthdr = ptr[0];
560 len = (ptr[1] + 1) << 3;
561 if (np->rxopt.bits.dstopts)
562 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
563 break;
564 case IPPROTO_ROUTING:
565 nexthdr = ptr[0];
566 len = (ptr[1] + 1) << 3;
567 if (np->rxopt.bits.srcrt)
568 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
569 break;
570 case IPPROTO_AH:
571 nexthdr = ptr[0];
572 len = (ptr[1] + 2) << 2;
573 break;
574 default:
575 nexthdr = ptr[0];
576 len = (ptr[1] + 1) << 3;
577 break;
578 }
579
580 off += len;
581 }
582 }
583
584 /* socket options in old style */
585 if (np->rxopt.bits.rxoinfo) {
586 struct in6_pktinfo src_info;
587
588 src_info.ipi6_ifindex = opt->iif;
589 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
590 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
591 }
592 if (np->rxopt.bits.rxohlim) {
593 int hlim = ipv6_hdr(skb)->hop_limit;
594 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
595 }
596 if (np->rxopt.bits.ohopopts && opt->hop) {
597 u8 *ptr = nh + opt->hop;
598 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
599 }
600 if (np->rxopt.bits.odstopts && opt->dst0) {
601 u8 *ptr = nh + opt->dst0;
602 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
603 }
604 if (np->rxopt.bits.osrcrt && opt->srcrt) {
605 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
606 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
607 }
608 if (np->rxopt.bits.odstopts && opt->dst1) {
609 u8 *ptr = nh + opt->dst1;
610 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
611 }
612 if (np->rxopt.bits.rxorigdstaddr) {
613 struct sockaddr_in6 sin6;
614 __be16 *ports = (__be16 *) skb_transport_header(skb);
615
616 if (skb_transport_offset(skb) + 4 <= skb->len) {
617 /* All current transport protocols have the port numbers in the
618 * first four bytes of the transport header and this function is
619 * written with this assumption in mind.
620 */
621
622 sin6.sin6_family = AF_INET6;
623 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
624 sin6.sin6_port = ports[1];
625 sin6.sin6_flowinfo = 0;
626 sin6.sin6_scope_id =
627 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
628 opt->iif);
629
630 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
631 }
632 }
633 }
634
635 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
636 struct sk_buff *skb)
637 {
638 ip6_datagram_recv_common_ctl(sk, msg, skb);
639 ip6_datagram_recv_specific_ctl(sk, msg, skb);
640 }
641 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
642
643 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
644 struct msghdr *msg, struct flowi6 *fl6,
645 struct ipv6_txoptions *opt,
646 int *hlimit, int *tclass, int *dontfrag)
647 {
648 struct in6_pktinfo *src_info;
649 struct cmsghdr *cmsg;
650 struct ipv6_rt_hdr *rthdr;
651 struct ipv6_opt_hdr *hdr;
652 int len;
653 int err = 0;
654
655 for_each_cmsghdr(cmsg, msg) {
656 int addr_type;
657
658 if (!CMSG_OK(msg, cmsg)) {
659 err = -EINVAL;
660 goto exit_f;
661 }
662
663 if (cmsg->cmsg_level != SOL_IPV6)
664 continue;
665
666 switch (cmsg->cmsg_type) {
667 case IPV6_PKTINFO:
668 case IPV6_2292PKTINFO:
669 {
670 struct net_device *dev = NULL;
671
672 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
673 err = -EINVAL;
674 goto exit_f;
675 }
676
677 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
678
679 if (src_info->ipi6_ifindex) {
680 if (fl6->flowi6_oif &&
681 src_info->ipi6_ifindex != fl6->flowi6_oif)
682 return -EINVAL;
683 fl6->flowi6_oif = src_info->ipi6_ifindex;
684 }
685
686 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
687
688 rcu_read_lock();
689 if (fl6->flowi6_oif) {
690 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
691 if (!dev) {
692 rcu_read_unlock();
693 return -ENODEV;
694 }
695 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
696 rcu_read_unlock();
697 return -EINVAL;
698 }
699
700 if (addr_type != IPV6_ADDR_ANY) {
701 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
702 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
703 !ipv6_chk_addr(net, &src_info->ipi6_addr,
704 strict ? dev : NULL, 0) &&
705 !ipv6_chk_acast_addr_src(net, dev,
706 &src_info->ipi6_addr))
707 err = -EINVAL;
708 else
709 fl6->saddr = src_info->ipi6_addr;
710 }
711
712 rcu_read_unlock();
713
714 if (err)
715 goto exit_f;
716
717 break;
718 }
719
720 case IPV6_FLOWINFO:
721 if (cmsg->cmsg_len < CMSG_LEN(4)) {
722 err = -EINVAL;
723 goto exit_f;
724 }
725
726 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
727 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
728 err = -EINVAL;
729 goto exit_f;
730 }
731 }
732 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
733 break;
734
735 case IPV6_2292HOPOPTS:
736 case IPV6_HOPOPTS:
737 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
738 err = -EINVAL;
739 goto exit_f;
740 }
741
742 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
743 len = ((hdr->hdrlen + 1) << 3);
744 if (cmsg->cmsg_len < CMSG_LEN(len)) {
745 err = -EINVAL;
746 goto exit_f;
747 }
748 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
749 err = -EPERM;
750 goto exit_f;
751 }
752 opt->opt_nflen += len;
753 opt->hopopt = hdr;
754 break;
755
756 case IPV6_2292DSTOPTS:
757 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
758 err = -EINVAL;
759 goto exit_f;
760 }
761
762 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
763 len = ((hdr->hdrlen + 1) << 3);
764 if (cmsg->cmsg_len < CMSG_LEN(len)) {
765 err = -EINVAL;
766 goto exit_f;
767 }
768 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
769 err = -EPERM;
770 goto exit_f;
771 }
772 if (opt->dst1opt) {
773 err = -EINVAL;
774 goto exit_f;
775 }
776 opt->opt_flen += len;
777 opt->dst1opt = hdr;
778 break;
779
780 case IPV6_DSTOPTS:
781 case IPV6_RTHDRDSTOPTS:
782 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
783 err = -EINVAL;
784 goto exit_f;
785 }
786
787 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
788 len = ((hdr->hdrlen + 1) << 3);
789 if (cmsg->cmsg_len < CMSG_LEN(len)) {
790 err = -EINVAL;
791 goto exit_f;
792 }
793 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
794 err = -EPERM;
795 goto exit_f;
796 }
797 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
798 opt->opt_flen += len;
799 opt->dst1opt = hdr;
800 } else {
801 opt->opt_nflen += len;
802 opt->dst0opt = hdr;
803 }
804 break;
805
806 case IPV6_2292RTHDR:
807 case IPV6_RTHDR:
808 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
809 err = -EINVAL;
810 goto exit_f;
811 }
812
813 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
814
815 switch (rthdr->type) {
816 #if IS_ENABLED(CONFIG_IPV6_MIP6)
817 case IPV6_SRCRT_TYPE_2:
818 if (rthdr->hdrlen != 2 ||
819 rthdr->segments_left != 1) {
820 err = -EINVAL;
821 goto exit_f;
822 }
823 break;
824 #endif
825 default:
826 err = -EINVAL;
827 goto exit_f;
828 }
829
830 len = ((rthdr->hdrlen + 1) << 3);
831
832 if (cmsg->cmsg_len < CMSG_LEN(len)) {
833 err = -EINVAL;
834 goto exit_f;
835 }
836
837 /* segments left must also match */
838 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
839 err = -EINVAL;
840 goto exit_f;
841 }
842
843 opt->opt_nflen += len;
844 opt->srcrt = rthdr;
845
846 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
847 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
848
849 opt->opt_nflen += dsthdrlen;
850 opt->dst0opt = opt->dst1opt;
851 opt->dst1opt = NULL;
852 opt->opt_flen -= dsthdrlen;
853 }
854
855 break;
856
857 case IPV6_2292HOPLIMIT:
858 case IPV6_HOPLIMIT:
859 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
860 err = -EINVAL;
861 goto exit_f;
862 }
863
864 *hlimit = *(int *)CMSG_DATA(cmsg);
865 if (*hlimit < -1 || *hlimit > 0xff) {
866 err = -EINVAL;
867 goto exit_f;
868 }
869
870 break;
871
872 case IPV6_TCLASS:
873 {
874 int tc;
875
876 err = -EINVAL;
877 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
878 goto exit_f;
879
880 tc = *(int *)CMSG_DATA(cmsg);
881 if (tc < -1 || tc > 0xff)
882 goto exit_f;
883
884 err = 0;
885 *tclass = tc;
886
887 break;
888 }
889
890 case IPV6_DONTFRAG:
891 {
892 int df;
893
894 err = -EINVAL;
895 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
896 goto exit_f;
897
898 df = *(int *)CMSG_DATA(cmsg);
899 if (df < 0 || df > 1)
900 goto exit_f;
901
902 err = 0;
903 *dontfrag = df;
904
905 break;
906 }
907 default:
908 net_dbg_ratelimited("invalid cmsg type: %d\n",
909 cmsg->cmsg_type);
910 err = -EINVAL;
911 goto exit_f;
912 }
913 }
914
915 exit_f:
916 return err;
917 }
918 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
919
920 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
921 __u16 srcp, __u16 destp, int bucket)
922 {
923 const struct in6_addr *dest, *src;
924
925 dest = &sp->sk_v6_daddr;
926 src = &sp->sk_v6_rcv_saddr;
927 seq_printf(seq,
928 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
929 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
930 bucket,
931 src->s6_addr32[0], src->s6_addr32[1],
932 src->s6_addr32[2], src->s6_addr32[3], srcp,
933 dest->s6_addr32[0], dest->s6_addr32[1],
934 dest->s6_addr32[2], dest->s6_addr32[3], destp,
935 sp->sk_state,
936 sk_wmem_alloc_get(sp),
937 sk_rmem_alloc_get(sp),
938 0, 0L, 0,
939 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
940 0,
941 sock_i_ino(sp),
942 atomic_read(&sp->sk_refcnt), sp,
943 atomic_read(&sp->sk_drops));
944 }
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