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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
38static bool ipv6_mapped_addr_any(const struct in6_addr *a)
39{
40 return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0);
41}
42
43static void ip6_datagram_flow_key_init(struct flowi6 *fl6, struct sock *sk)
44{
45 struct inet_sock *inet = inet_sk(sk);
46 struct ipv6_pinfo *np = inet6_sk(sk);
47
48 memset(fl6, 0, sizeof(*fl6));
49 fl6->flowi6_proto = sk->sk_protocol;
50 fl6->daddr = sk->sk_v6_daddr;
51 fl6->saddr = np->saddr;
52 fl6->flowi6_oif = sk->sk_bound_dev_if;
53 fl6->flowi6_mark = sk->sk_mark;
54 fl6->fl6_dport = inet->inet_dport;
55 fl6->fl6_sport = inet->inet_sport;
56 fl6->flowlabel = np->flow_label;
57
58 if (!fl6->flowi6_oif)
59 fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
60
61 if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr))
62 fl6->flowi6_oif = np->mcast_oif;
63
64 security_sk_classify_flow(sk, flowi6_to_flowi(fl6));
65}
66
67int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr)
68{
69 struct ip6_flowlabel *flowlabel = NULL;
70 struct in6_addr *final_p, final;
71 struct ipv6_txoptions *opt;
72 struct dst_entry *dst;
73 struct inet_sock *inet = inet_sk(sk);
74 struct ipv6_pinfo *np = inet6_sk(sk);
75 struct flowi6 fl6;
76 int err = 0;
77
78 if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) {
79 flowlabel = fl6_sock_lookup(sk, np->flow_label);
80 if (!flowlabel)
81 return -EINVAL;
82 }
83 ip6_datagram_flow_key_init(&fl6, sk);
84
85 rcu_read_lock();
86 opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt);
87 final_p = fl6_update_dst(&fl6, opt, &final);
88 rcu_read_unlock();
89
90 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
91 if (IS_ERR(dst)) {
92 err = PTR_ERR(dst);
93 goto out;
94 }
95
96 if (fix_sk_saddr) {
97 if (ipv6_addr_any(&np->saddr))
98 np->saddr = fl6.saddr;
99
100 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
101 sk->sk_v6_rcv_saddr = fl6.saddr;
102 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
103 if (sk->sk_prot->rehash)
104 sk->sk_prot->rehash(sk);
105 }
106 }
107
108 ip6_dst_store(sk, dst,
109 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
110 &sk->sk_v6_daddr : NULL,
111#ifdef CONFIG_IPV6_SUBTREES
112 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
113 &np->saddr :
114#endif
115 NULL);
116
117out:
118 fl6_sock_release(flowlabel);
119 return err;
120}
121
122void ip6_datagram_release_cb(struct sock *sk)
123{
124 struct dst_entry *dst;
125
126 if (ipv6_addr_v4mapped(&sk->sk_v6_daddr))
127 return;
128
129 rcu_read_lock();
130 dst = __sk_dst_get(sk);
131 if (!dst || !dst->obsolete ||
132 dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) {
133 rcu_read_unlock();
134 return;
135 }
136 rcu_read_unlock();
137
138 ip6_datagram_dst_update(sk, false);
139}
140EXPORT_SYMBOL_GPL(ip6_datagram_release_cb);
141
142static int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
143{
144 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
145 struct inet_sock *inet = inet_sk(sk);
146 struct ipv6_pinfo *np = inet6_sk(sk);
147 struct in6_addr *daddr;
148 int addr_type;
149 int err;
150 __be32 fl6_flowlabel = 0;
151
152 if (usin->sin6_family == AF_INET) {
153 if (__ipv6_only_sock(sk))
154 return -EAFNOSUPPORT;
155 err = __ip4_datagram_connect(sk, uaddr, addr_len);
156 goto ipv4_connected;
157 }
158
159 if (addr_len < SIN6_LEN_RFC2133)
160 return -EINVAL;
161
162 if (usin->sin6_family != AF_INET6)
163 return -EAFNOSUPPORT;
164
165 if (np->sndflow)
166 fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
167
168 addr_type = ipv6_addr_type(&usin->sin6_addr);
169
170 if (addr_type == IPV6_ADDR_ANY) {
171 /*
172 * connect to self
173 */
174 usin->sin6_addr.s6_addr[15] = 0x01;
175 }
176
177 daddr = &usin->sin6_addr;
178
179 if (addr_type == IPV6_ADDR_MAPPED) {
180 struct sockaddr_in sin;
181
182 if (__ipv6_only_sock(sk)) {
183 err = -ENETUNREACH;
184 goto out;
185 }
186 sin.sin_family = AF_INET;
187 sin.sin_addr.s_addr = daddr->s6_addr32[3];
188 sin.sin_port = usin->sin6_port;
189
190 err = __ip4_datagram_connect(sk,
191 (struct sockaddr *) &sin,
192 sizeof(sin));
193
194ipv4_connected:
195 if (err)
196 goto out;
197
198 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
199
200 if (ipv6_addr_any(&np->saddr) ||
201 ipv6_mapped_addr_any(&np->saddr))
202 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
203
204 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
205 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
206 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
207 &sk->sk_v6_rcv_saddr);
208 if (sk->sk_prot->rehash)
209 sk->sk_prot->rehash(sk);
210 }
211
212 goto out;
213 }
214
215 if (__ipv6_addr_needs_scope_id(addr_type)) {
216 if (addr_len >= sizeof(struct sockaddr_in6) &&
217 usin->sin6_scope_id) {
218 if (sk->sk_bound_dev_if &&
219 sk->sk_bound_dev_if != usin->sin6_scope_id) {
220 err = -EINVAL;
221 goto out;
222 }
223 sk->sk_bound_dev_if = usin->sin6_scope_id;
224 }
225
226 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
227 sk->sk_bound_dev_if = np->mcast_oif;
228
229 /* Connect to link-local address requires an interface */
230 if (!sk->sk_bound_dev_if) {
231 err = -EINVAL;
232 goto out;
233 }
234 }
235
236 sk->sk_v6_daddr = *daddr;
237 np->flow_label = fl6_flowlabel;
238
239 inet->inet_dport = usin->sin6_port;
240
241 /*
242 * Check for a route to destination an obtain the
243 * destination cache for it.
244 */
245
246 err = ip6_datagram_dst_update(sk, true);
247 if (err)
248 goto out;
249
250 sk->sk_state = TCP_ESTABLISHED;
251 sk_set_txhash(sk);
252out:
253 return err;
254}
255
256int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
257{
258 int res;
259
260 lock_sock(sk);
261 res = __ip6_datagram_connect(sk, uaddr, addr_len);
262 release_sock(sk);
263 return res;
264}
265EXPORT_SYMBOL_GPL(ip6_datagram_connect);
266
267int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
268 int addr_len)
269{
270 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
271 if (sin6->sin6_family != AF_INET6)
272 return -EAFNOSUPPORT;
273 return ip6_datagram_connect(sk, uaddr, addr_len);
274}
275EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
276
277void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
278 __be16 port, u32 info, u8 *payload)
279{
280 struct ipv6_pinfo *np = inet6_sk(sk);
281 struct icmp6hdr *icmph = icmp6_hdr(skb);
282 struct sock_exterr_skb *serr;
283
284 if (!np->recverr)
285 return;
286
287 skb = skb_clone(skb, GFP_ATOMIC);
288 if (!skb)
289 return;
290
291 skb->protocol = htons(ETH_P_IPV6);
292
293 serr = SKB_EXT_ERR(skb);
294 serr->ee.ee_errno = err;
295 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
296 serr->ee.ee_type = icmph->icmp6_type;
297 serr->ee.ee_code = icmph->icmp6_code;
298 serr->ee.ee_pad = 0;
299 serr->ee.ee_info = info;
300 serr->ee.ee_data = 0;
301 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
302 skb_network_header(skb);
303 serr->port = port;
304
305 __skb_pull(skb, payload - skb->data);
306 skb_reset_transport_header(skb);
307
308 if (sock_queue_err_skb(sk, skb))
309 kfree_skb(skb);
310}
311
312void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
313{
314 const struct ipv6_pinfo *np = inet6_sk(sk);
315 struct sock_exterr_skb *serr;
316 struct ipv6hdr *iph;
317 struct sk_buff *skb;
318
319 if (!np->recverr)
320 return;
321
322 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
323 if (!skb)
324 return;
325
326 skb->protocol = htons(ETH_P_IPV6);
327
328 skb_put(skb, sizeof(struct ipv6hdr));
329 skb_reset_network_header(skb);
330 iph = ipv6_hdr(skb);
331 iph->daddr = fl6->daddr;
332
333 serr = SKB_EXT_ERR(skb);
334 serr->ee.ee_errno = err;
335 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
336 serr->ee.ee_type = 0;
337 serr->ee.ee_code = 0;
338 serr->ee.ee_pad = 0;
339 serr->ee.ee_info = info;
340 serr->ee.ee_data = 0;
341 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
342 serr->port = fl6->fl6_dport;
343
344 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
345 skb_reset_transport_header(skb);
346
347 if (sock_queue_err_skb(sk, skb))
348 kfree_skb(skb);
349}
350
351void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
352{
353 struct ipv6_pinfo *np = inet6_sk(sk);
354 struct ipv6hdr *iph;
355 struct sk_buff *skb;
356 struct ip6_mtuinfo *mtu_info;
357
358 if (!np->rxopt.bits.rxpmtu)
359 return;
360
361 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
362 if (!skb)
363 return;
364
365 skb_put(skb, sizeof(struct ipv6hdr));
366 skb_reset_network_header(skb);
367 iph = ipv6_hdr(skb);
368 iph->daddr = fl6->daddr;
369
370 mtu_info = IP6CBMTU(skb);
371
372 mtu_info->ip6m_mtu = mtu;
373 mtu_info->ip6m_addr.sin6_family = AF_INET6;
374 mtu_info->ip6m_addr.sin6_port = 0;
375 mtu_info->ip6m_addr.sin6_flowinfo = 0;
376 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
377 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
378
379 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
380 skb_reset_transport_header(skb);
381
382 skb = xchg(&np->rxpmtu, skb);
383 kfree_skb(skb);
384}
385
386/* For some errors we have valid addr_offset even with zero payload and
387 * zero port. Also, addr_offset should be supported if port is set.
388 */
389static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
390{
391 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
392 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
393 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
394}
395
396/* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
397 *
398 * At one point, excluding local errors was a quick test to identify icmp/icmp6
399 * errors. This is no longer true, but the test remained, so the v6 stack,
400 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
401 *
402 * Timestamp code paths do not initialize the fields expected by cmsg:
403 * the PKTINFO fields in skb->cb[]. Fill those in here.
404 */
405static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
406 struct sock_exterr_skb *serr)
407{
408 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
409 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
410 return true;
411
412 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
413 return false;
414
415 if (!skb->dev)
416 return false;
417
418 if (skb->protocol == htons(ETH_P_IPV6))
419 IP6CB(skb)->iif = skb->dev->ifindex;
420 else
421 PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex;
422
423 return true;
424}
425
426/*
427 * Handle MSG_ERRQUEUE
428 */
429int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
430{
431 struct ipv6_pinfo *np = inet6_sk(sk);
432 struct sock_exterr_skb *serr;
433 struct sk_buff *skb;
434 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
435 struct {
436 struct sock_extended_err ee;
437 struct sockaddr_in6 offender;
438 } errhdr;
439 int err;
440 int copied;
441
442 err = -EAGAIN;
443 skb = sock_dequeue_err_skb(sk);
444 if (!skb)
445 goto out;
446
447 copied = skb->len;
448 if (copied > len) {
449 msg->msg_flags |= MSG_TRUNC;
450 copied = len;
451 }
452 err = skb_copy_datagram_msg(skb, 0, msg, copied);
453 if (err)
454 goto out_free_skb;
455
456 sock_recv_timestamp(msg, sk, skb);
457
458 serr = SKB_EXT_ERR(skb);
459
460 if (sin && ipv6_datagram_support_addr(serr)) {
461 const unsigned char *nh = skb_network_header(skb);
462 sin->sin6_family = AF_INET6;
463 sin->sin6_flowinfo = 0;
464 sin->sin6_port = serr->port;
465 if (skb->protocol == htons(ETH_P_IPV6)) {
466 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
467 struct ipv6hdr, daddr);
468 sin->sin6_addr = ip6h->daddr;
469 if (np->sndflow)
470 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
471 sin->sin6_scope_id =
472 ipv6_iface_scope_id(&sin->sin6_addr,
473 IP6CB(skb)->iif);
474 } else {
475 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
476 &sin->sin6_addr);
477 sin->sin6_scope_id = 0;
478 }
479 *addr_len = sizeof(*sin);
480 }
481
482 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
483 sin = &errhdr.offender;
484 memset(sin, 0, sizeof(*sin));
485
486 if (ip6_datagram_support_cmsg(skb, serr)) {
487 sin->sin6_family = AF_INET6;
488 if (np->rxopt.all)
489 ip6_datagram_recv_common_ctl(sk, msg, skb);
490 if (skb->protocol == htons(ETH_P_IPV6)) {
491 sin->sin6_addr = ipv6_hdr(skb)->saddr;
492 if (np->rxopt.all)
493 ip6_datagram_recv_specific_ctl(sk, msg, skb);
494 sin->sin6_scope_id =
495 ipv6_iface_scope_id(&sin->sin6_addr,
496 IP6CB(skb)->iif);
497 } else {
498 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
499 &sin->sin6_addr);
500 if (inet_sk(sk)->cmsg_flags)
501 ip_cmsg_recv(msg, skb);
502 }
503 }
504
505 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
506
507 /* Now we could try to dump offended packet options */
508
509 msg->msg_flags |= MSG_ERRQUEUE;
510 err = copied;
511
512out_free_skb:
513 kfree_skb(skb);
514out:
515 return err;
516}
517EXPORT_SYMBOL_GPL(ipv6_recv_error);
518
519/*
520 * Handle IPV6_RECVPATHMTU
521 */
522int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
523 int *addr_len)
524{
525 struct ipv6_pinfo *np = inet6_sk(sk);
526 struct sk_buff *skb;
527 struct ip6_mtuinfo mtu_info;
528 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
529 int err;
530 int copied;
531
532 err = -EAGAIN;
533 skb = xchg(&np->rxpmtu, NULL);
534 if (!skb)
535 goto out;
536
537 copied = skb->len;
538 if (copied > len) {
539 msg->msg_flags |= MSG_TRUNC;
540 copied = len;
541 }
542 err = skb_copy_datagram_msg(skb, 0, msg, copied);
543 if (err)
544 goto out_free_skb;
545
546 sock_recv_timestamp(msg, sk, skb);
547
548 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
549
550 if (sin) {
551 sin->sin6_family = AF_INET6;
552 sin->sin6_flowinfo = 0;
553 sin->sin6_port = 0;
554 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
555 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
556 *addr_len = sizeof(*sin);
557 }
558
559 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
560
561 err = copied;
562
563out_free_skb:
564 kfree_skb(skb);
565out:
566 return err;
567}
568
569
570void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
571 struct sk_buff *skb)
572{
573 struct ipv6_pinfo *np = inet6_sk(sk);
574 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
575
576 if (np->rxopt.bits.rxinfo) {
577 struct in6_pktinfo src_info;
578
579 if (is_ipv6) {
580 src_info.ipi6_ifindex = IP6CB(skb)->iif;
581 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
582 } else {
583 src_info.ipi6_ifindex =
584 PKTINFO_SKB_CB(skb)->ipi_ifindex;
585 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
586 &src_info.ipi6_addr);
587 }
588
589 if (src_info.ipi6_ifindex >= 0)
590 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
591 sizeof(src_info), &src_info);
592 }
593}
594
595void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
596 struct sk_buff *skb)
597{
598 struct ipv6_pinfo *np = inet6_sk(sk);
599 struct inet6_skb_parm *opt = IP6CB(skb);
600 unsigned char *nh = skb_network_header(skb);
601
602 if (np->rxopt.bits.rxhlim) {
603 int hlim = ipv6_hdr(skb)->hop_limit;
604 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
605 }
606
607 if (np->rxopt.bits.rxtclass) {
608 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
609 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
610 }
611
612 if (np->rxopt.bits.rxflow) {
613 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
614 if (flowinfo)
615 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
616 }
617
618 /* HbH is allowed only once */
619 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
620 u8 *ptr = nh + sizeof(struct ipv6hdr);
621 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
622 }
623
624 if (opt->lastopt &&
625 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
626 /*
627 * Silly enough, but we need to reparse in order to
628 * report extension headers (except for HbH)
629 * in order.
630 *
631 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
632 * (and WILL NOT be) defined because
633 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
634 */
635 unsigned int off = sizeof(struct ipv6hdr);
636 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
637
638 while (off <= opt->lastopt) {
639 unsigned int len;
640 u8 *ptr = nh + off;
641
642 switch (nexthdr) {
643 case IPPROTO_DSTOPTS:
644 nexthdr = ptr[0];
645 len = (ptr[1] + 1) << 3;
646 if (np->rxopt.bits.dstopts)
647 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
648 break;
649 case IPPROTO_ROUTING:
650 nexthdr = ptr[0];
651 len = (ptr[1] + 1) << 3;
652 if (np->rxopt.bits.srcrt)
653 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
654 break;
655 case IPPROTO_AH:
656 nexthdr = ptr[0];
657 len = (ptr[1] + 2) << 2;
658 break;
659 default:
660 nexthdr = ptr[0];
661 len = (ptr[1] + 1) << 3;
662 break;
663 }
664
665 off += len;
666 }
667 }
668
669 /* socket options in old style */
670 if (np->rxopt.bits.rxoinfo) {
671 struct in6_pktinfo src_info;
672
673 src_info.ipi6_ifindex = opt->iif;
674 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
675 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
676 }
677 if (np->rxopt.bits.rxohlim) {
678 int hlim = ipv6_hdr(skb)->hop_limit;
679 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
680 }
681 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
682 u8 *ptr = nh + sizeof(struct ipv6hdr);
683 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
684 }
685 if (np->rxopt.bits.odstopts && opt->dst0) {
686 u8 *ptr = nh + opt->dst0;
687 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
688 }
689 if (np->rxopt.bits.osrcrt && opt->srcrt) {
690 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
691 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
692 }
693 if (np->rxopt.bits.odstopts && opt->dst1) {
694 u8 *ptr = nh + opt->dst1;
695 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
696 }
697 if (np->rxopt.bits.rxorigdstaddr) {
698 struct sockaddr_in6 sin6;
699 __be16 *ports = (__be16 *) skb_transport_header(skb);
700
701 if (skb_transport_offset(skb) + 4 <= skb->len) {
702 /* All current transport protocols have the port numbers in the
703 * first four bytes of the transport header and this function is
704 * written with this assumption in mind.
705 */
706
707 sin6.sin6_family = AF_INET6;
708 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
709 sin6.sin6_port = ports[1];
710 sin6.sin6_flowinfo = 0;
711 sin6.sin6_scope_id =
712 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
713 opt->iif);
714
715 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
716 }
717 }
718}
719
720void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
721 struct sk_buff *skb)
722{
723 ip6_datagram_recv_common_ctl(sk, msg, skb);
724 ip6_datagram_recv_specific_ctl(sk, msg, skb);
725}
726EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
727
728int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
729 struct msghdr *msg, struct flowi6 *fl6,
730 struct ipv6_txoptions *opt,
731 int *hlimit, int *tclass, int *dontfrag)
732{
733 struct in6_pktinfo *src_info;
734 struct cmsghdr *cmsg;
735 struct ipv6_rt_hdr *rthdr;
736 struct ipv6_opt_hdr *hdr;
737 int len;
738 int err = 0;
739
740 for_each_cmsghdr(cmsg, msg) {
741 int addr_type;
742
743 if (!CMSG_OK(msg, cmsg)) {
744 err = -EINVAL;
745 goto exit_f;
746 }
747
748 if (cmsg->cmsg_level != SOL_IPV6)
749 continue;
750
751 switch (cmsg->cmsg_type) {
752 case IPV6_PKTINFO:
753 case IPV6_2292PKTINFO:
754 {
755 struct net_device *dev = NULL;
756
757 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
758 err = -EINVAL;
759 goto exit_f;
760 }
761
762 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
763
764 if (src_info->ipi6_ifindex) {
765 if (fl6->flowi6_oif &&
766 src_info->ipi6_ifindex != fl6->flowi6_oif)
767 return -EINVAL;
768 fl6->flowi6_oif = src_info->ipi6_ifindex;
769 }
770
771 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
772
773 rcu_read_lock();
774 if (fl6->flowi6_oif) {
775 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
776 if (!dev) {
777 rcu_read_unlock();
778 return -ENODEV;
779 }
780 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
781 rcu_read_unlock();
782 return -EINVAL;
783 }
784
785 if (addr_type != IPV6_ADDR_ANY) {
786 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
787 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
788 !ipv6_chk_addr(net, &src_info->ipi6_addr,
789 strict ? dev : NULL, 0) &&
790 !ipv6_chk_acast_addr_src(net, dev,
791 &src_info->ipi6_addr))
792 err = -EINVAL;
793 else
794 fl6->saddr = src_info->ipi6_addr;
795 }
796
797 rcu_read_unlock();
798
799 if (err)
800 goto exit_f;
801
802 break;
803 }
804
805 case IPV6_FLOWINFO:
806 if (cmsg->cmsg_len < CMSG_LEN(4)) {
807 err = -EINVAL;
808 goto exit_f;
809 }
810
811 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
812 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
813 err = -EINVAL;
814 goto exit_f;
815 }
816 }
817 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
818 break;
819
820 case IPV6_2292HOPOPTS:
821 case IPV6_HOPOPTS:
822 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
823 err = -EINVAL;
824 goto exit_f;
825 }
826
827 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
828 len = ((hdr->hdrlen + 1) << 3);
829 if (cmsg->cmsg_len < CMSG_LEN(len)) {
830 err = -EINVAL;
831 goto exit_f;
832 }
833 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
834 err = -EPERM;
835 goto exit_f;
836 }
837 opt->opt_nflen += len;
838 opt->hopopt = hdr;
839 break;
840
841 case IPV6_2292DSTOPTS:
842 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
843 err = -EINVAL;
844 goto exit_f;
845 }
846
847 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
848 len = ((hdr->hdrlen + 1) << 3);
849 if (cmsg->cmsg_len < CMSG_LEN(len)) {
850 err = -EINVAL;
851 goto exit_f;
852 }
853 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
854 err = -EPERM;
855 goto exit_f;
856 }
857 if (opt->dst1opt) {
858 err = -EINVAL;
859 goto exit_f;
860 }
861 opt->opt_flen += len;
862 opt->dst1opt = hdr;
863 break;
864
865 case IPV6_DSTOPTS:
866 case IPV6_RTHDRDSTOPTS:
867 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
868 err = -EINVAL;
869 goto exit_f;
870 }
871
872 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
873 len = ((hdr->hdrlen + 1) << 3);
874 if (cmsg->cmsg_len < CMSG_LEN(len)) {
875 err = -EINVAL;
876 goto exit_f;
877 }
878 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
879 err = -EPERM;
880 goto exit_f;
881 }
882 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
883 opt->opt_flen += len;
884 opt->dst1opt = hdr;
885 } else {
886 opt->opt_nflen += len;
887 opt->dst0opt = hdr;
888 }
889 break;
890
891 case IPV6_2292RTHDR:
892 case IPV6_RTHDR:
893 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
894 err = -EINVAL;
895 goto exit_f;
896 }
897
898 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
899
900 switch (rthdr->type) {
901#if IS_ENABLED(CONFIG_IPV6_MIP6)
902 case IPV6_SRCRT_TYPE_2:
903 if (rthdr->hdrlen != 2 ||
904 rthdr->segments_left != 1) {
905 err = -EINVAL;
906 goto exit_f;
907 }
908 break;
909#endif
910 default:
911 err = -EINVAL;
912 goto exit_f;
913 }
914
915 len = ((rthdr->hdrlen + 1) << 3);
916
917 if (cmsg->cmsg_len < CMSG_LEN(len)) {
918 err = -EINVAL;
919 goto exit_f;
920 }
921
922 /* segments left must also match */
923 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
924 err = -EINVAL;
925 goto exit_f;
926 }
927
928 opt->opt_nflen += len;
929 opt->srcrt = rthdr;
930
931 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
932 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
933
934 opt->opt_nflen += dsthdrlen;
935 opt->dst0opt = opt->dst1opt;
936 opt->dst1opt = NULL;
937 opt->opt_flen -= dsthdrlen;
938 }
939
940 break;
941
942 case IPV6_2292HOPLIMIT:
943 case IPV6_HOPLIMIT:
944 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
945 err = -EINVAL;
946 goto exit_f;
947 }
948
949 *hlimit = *(int *)CMSG_DATA(cmsg);
950 if (*hlimit < -1 || *hlimit > 0xff) {
951 err = -EINVAL;
952 goto exit_f;
953 }
954
955 break;
956
957 case IPV6_TCLASS:
958 {
959 int tc;
960
961 err = -EINVAL;
962 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
963 goto exit_f;
964
965 tc = *(int *)CMSG_DATA(cmsg);
966 if (tc < -1 || tc > 0xff)
967 goto exit_f;
968
969 err = 0;
970 *tclass = tc;
971
972 break;
973 }
974
975 case IPV6_DONTFRAG:
976 {
977 int df;
978
979 err = -EINVAL;
980 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
981 goto exit_f;
982
983 df = *(int *)CMSG_DATA(cmsg);
984 if (df < 0 || df > 1)
985 goto exit_f;
986
987 err = 0;
988 *dontfrag = df;
989
990 break;
991 }
992 default:
993 net_dbg_ratelimited("invalid cmsg type: %d\n",
994 cmsg->cmsg_type);
995 err = -EINVAL;
996 goto exit_f;
997 }
998 }
999
1000exit_f:
1001 return err;
1002}
1003EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
1004
1005void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
1006 __u16 srcp, __u16 destp, int bucket)
1007{
1008 const struct in6_addr *dest, *src;
1009
1010 dest = &sp->sk_v6_daddr;
1011 src = &sp->sk_v6_rcv_saddr;
1012 seq_printf(seq,
1013 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1014 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
1015 bucket,
1016 src->s6_addr32[0], src->s6_addr32[1],
1017 src->s6_addr32[2], src->s6_addr32[3], srcp,
1018 dest->s6_addr32[0], dest->s6_addr32[1],
1019 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1020 sp->sk_state,
1021 sk_wmem_alloc_get(sp),
1022 sk_rmem_alloc_get(sp),
1023 0, 0L, 0,
1024 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1025 0,
1026 sock_i_ino(sp),
1027 atomic_read(&sp->sk_refcnt), sp,
1028 atomic_read(&sp->sk_drops));
1029}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * common UDP/RAW code
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 */
9
10#include <linux/capability.h>
11#include <linux/errno.h>
12#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/interrupt.h>
15#include <linux/socket.h>
16#include <linux/sockios.h>
17#include <linux/in6.h>
18#include <linux/ipv6.h>
19#include <linux/route.h>
20#include <linux/slab.h>
21#include <linux/export.h>
22#include <linux/icmp.h>
23
24#include <net/ipv6.h>
25#include <net/ndisc.h>
26#include <net/addrconf.h>
27#include <net/transp_v6.h>
28#include <net/ip6_route.h>
29#include <net/tcp_states.h>
30#include <net/dsfield.h>
31#include <net/sock_reuseport.h>
32
33#include <linux/errqueue.h>
34#include <linux/uaccess.h>
35
36static bool ipv6_mapped_addr_any(const struct in6_addr *a)
37{
38 return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0);
39}
40
41static void ip6_datagram_flow_key_init(struct flowi6 *fl6, struct sock *sk)
42{
43 struct inet_sock *inet = inet_sk(sk);
44 struct ipv6_pinfo *np = inet6_sk(sk);
45
46 memset(fl6, 0, sizeof(*fl6));
47 fl6->flowi6_proto = sk->sk_protocol;
48 fl6->daddr = sk->sk_v6_daddr;
49 fl6->saddr = np->saddr;
50 fl6->flowi6_oif = sk->sk_bound_dev_if;
51 fl6->flowi6_mark = sk->sk_mark;
52 fl6->fl6_dport = inet->inet_dport;
53 fl6->fl6_sport = inet->inet_sport;
54 fl6->flowlabel = np->flow_label;
55 fl6->flowi6_uid = sk->sk_uid;
56
57 if (!fl6->flowi6_oif)
58 fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
59
60 if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr))
61 fl6->flowi6_oif = np->mcast_oif;
62
63 security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6));
64}
65
66int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr)
67{
68 struct ip6_flowlabel *flowlabel = NULL;
69 struct in6_addr *final_p, final;
70 struct ipv6_txoptions *opt;
71 struct dst_entry *dst;
72 struct inet_sock *inet = inet_sk(sk);
73 struct ipv6_pinfo *np = inet6_sk(sk);
74 struct flowi6 fl6;
75 int err = 0;
76
77 if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) {
78 flowlabel = fl6_sock_lookup(sk, np->flow_label);
79 if (IS_ERR(flowlabel))
80 return -EINVAL;
81 }
82 ip6_datagram_flow_key_init(&fl6, sk);
83
84 rcu_read_lock();
85 opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt);
86 final_p = fl6_update_dst(&fl6, opt, &final);
87 rcu_read_unlock();
88
89 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
90 if (IS_ERR(dst)) {
91 err = PTR_ERR(dst);
92 goto out;
93 }
94
95 if (fix_sk_saddr) {
96 if (ipv6_addr_any(&np->saddr))
97 np->saddr = fl6.saddr;
98
99 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
100 sk->sk_v6_rcv_saddr = fl6.saddr;
101 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
102 if (sk->sk_prot->rehash)
103 sk->sk_prot->rehash(sk);
104 }
105 }
106
107 ip6_sk_dst_store_flow(sk, dst, &fl6);
108
109out:
110 fl6_sock_release(flowlabel);
111 return err;
112}
113
114void ip6_datagram_release_cb(struct sock *sk)
115{
116 struct dst_entry *dst;
117
118 if (ipv6_addr_v4mapped(&sk->sk_v6_daddr))
119 return;
120
121 rcu_read_lock();
122 dst = __sk_dst_get(sk);
123 if (!dst || !dst->obsolete ||
124 dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) {
125 rcu_read_unlock();
126 return;
127 }
128 rcu_read_unlock();
129
130 ip6_datagram_dst_update(sk, false);
131}
132EXPORT_SYMBOL_GPL(ip6_datagram_release_cb);
133
134int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr,
135 int addr_len)
136{
137 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
138 struct inet_sock *inet = inet_sk(sk);
139 struct ipv6_pinfo *np = inet6_sk(sk);
140 struct in6_addr *daddr, old_daddr;
141 __be32 fl6_flowlabel = 0;
142 __be32 old_fl6_flowlabel;
143 __be16 old_dport;
144 int addr_type;
145 int err;
146
147 if (usin->sin6_family == AF_INET) {
148 if (__ipv6_only_sock(sk))
149 return -EAFNOSUPPORT;
150 err = __ip4_datagram_connect(sk, uaddr, addr_len);
151 goto ipv4_connected;
152 }
153
154 if (addr_len < SIN6_LEN_RFC2133)
155 return -EINVAL;
156
157 if (usin->sin6_family != AF_INET6)
158 return -EAFNOSUPPORT;
159
160 if (np->sndflow)
161 fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
162
163 if (ipv6_addr_any(&usin->sin6_addr)) {
164 /*
165 * connect to self
166 */
167 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
168 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
169 &usin->sin6_addr);
170 else
171 usin->sin6_addr = in6addr_loopback;
172 }
173
174 addr_type = ipv6_addr_type(&usin->sin6_addr);
175
176 daddr = &usin->sin6_addr;
177
178 if (addr_type & IPV6_ADDR_MAPPED) {
179 struct sockaddr_in sin;
180
181 if (__ipv6_only_sock(sk)) {
182 err = -ENETUNREACH;
183 goto out;
184 }
185 sin.sin_family = AF_INET;
186 sin.sin_addr.s_addr = daddr->s6_addr32[3];
187 sin.sin_port = usin->sin6_port;
188
189 err = __ip4_datagram_connect(sk,
190 (struct sockaddr *) &sin,
191 sizeof(sin));
192
193ipv4_connected:
194 if (err)
195 goto out;
196
197 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
198
199 if (ipv6_addr_any(&np->saddr) ||
200 ipv6_mapped_addr_any(&np->saddr))
201 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
202
203 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
204 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
205 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
206 &sk->sk_v6_rcv_saddr);
207 if (sk->sk_prot->rehash)
208 sk->sk_prot->rehash(sk);
209 }
210
211 goto out;
212 }
213
214 if (__ipv6_addr_needs_scope_id(addr_type)) {
215 if (addr_len >= sizeof(struct sockaddr_in6) &&
216 usin->sin6_scope_id) {
217 if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id)) {
218 err = -EINVAL;
219 goto out;
220 }
221 sk->sk_bound_dev_if = usin->sin6_scope_id;
222 }
223
224 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
225 sk->sk_bound_dev_if = np->mcast_oif;
226
227 /* Connect to link-local address requires an interface */
228 if (!sk->sk_bound_dev_if) {
229 err = -EINVAL;
230 goto out;
231 }
232 }
233
234 /* save the current peer information before updating it */
235 old_daddr = sk->sk_v6_daddr;
236 old_fl6_flowlabel = np->flow_label;
237 old_dport = inet->inet_dport;
238
239 sk->sk_v6_daddr = *daddr;
240 np->flow_label = fl6_flowlabel;
241 inet->inet_dport = usin->sin6_port;
242
243 /*
244 * Check for a route to destination an obtain the
245 * destination cache for it.
246 */
247
248 err = ip6_datagram_dst_update(sk, true);
249 if (err) {
250 /* Restore the socket peer info, to keep it consistent with
251 * the old socket state
252 */
253 sk->sk_v6_daddr = old_daddr;
254 np->flow_label = old_fl6_flowlabel;
255 inet->inet_dport = old_dport;
256 goto out;
257 }
258
259 reuseport_has_conns(sk, true);
260 sk->sk_state = TCP_ESTABLISHED;
261 sk_set_txhash(sk);
262out:
263 return err;
264}
265EXPORT_SYMBOL_GPL(__ip6_datagram_connect);
266
267int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
268{
269 int res;
270
271 lock_sock(sk);
272 res = __ip6_datagram_connect(sk, uaddr, addr_len);
273 release_sock(sk);
274 return res;
275}
276EXPORT_SYMBOL_GPL(ip6_datagram_connect);
277
278int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
279 int addr_len)
280{
281 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
282 if (sin6->sin6_family != AF_INET6)
283 return -EAFNOSUPPORT;
284 return ip6_datagram_connect(sk, uaddr, addr_len);
285}
286EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
287
288static void ipv6_icmp_error_rfc4884(const struct sk_buff *skb,
289 struct sock_ee_data_rfc4884 *out)
290{
291 switch (icmp6_hdr(skb)->icmp6_type) {
292 case ICMPV6_TIME_EXCEED:
293 case ICMPV6_DEST_UNREACH:
294 ip_icmp_error_rfc4884(skb, out, sizeof(struct icmp6hdr),
295 icmp6_hdr(skb)->icmp6_datagram_len * 8);
296 }
297}
298
299void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
300 __be16 port, u32 info, u8 *payload)
301{
302 struct ipv6_pinfo *np = inet6_sk(sk);
303 struct icmp6hdr *icmph = icmp6_hdr(skb);
304 struct sock_exterr_skb *serr;
305
306 if (!np->recverr)
307 return;
308
309 skb = skb_clone(skb, GFP_ATOMIC);
310 if (!skb)
311 return;
312
313 skb->protocol = htons(ETH_P_IPV6);
314
315 serr = SKB_EXT_ERR(skb);
316 serr->ee.ee_errno = err;
317 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
318 serr->ee.ee_type = icmph->icmp6_type;
319 serr->ee.ee_code = icmph->icmp6_code;
320 serr->ee.ee_pad = 0;
321 serr->ee.ee_info = info;
322 serr->ee.ee_data = 0;
323 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
324 skb_network_header(skb);
325 serr->port = port;
326
327 __skb_pull(skb, payload - skb->data);
328
329 if (inet6_sk(sk)->recverr_rfc4884)
330 ipv6_icmp_error_rfc4884(skb, &serr->ee.ee_rfc4884);
331
332 skb_reset_transport_header(skb);
333
334 if (sock_queue_err_skb(sk, skb))
335 kfree_skb(skb);
336}
337
338void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
339{
340 const struct ipv6_pinfo *np = inet6_sk(sk);
341 struct sock_exterr_skb *serr;
342 struct ipv6hdr *iph;
343 struct sk_buff *skb;
344
345 if (!np->recverr)
346 return;
347
348 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
349 if (!skb)
350 return;
351
352 skb->protocol = htons(ETH_P_IPV6);
353
354 skb_put(skb, sizeof(struct ipv6hdr));
355 skb_reset_network_header(skb);
356 iph = ipv6_hdr(skb);
357 iph->daddr = fl6->daddr;
358 ip6_flow_hdr(iph, 0, 0);
359
360 serr = SKB_EXT_ERR(skb);
361 serr->ee.ee_errno = err;
362 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
363 serr->ee.ee_type = 0;
364 serr->ee.ee_code = 0;
365 serr->ee.ee_pad = 0;
366 serr->ee.ee_info = info;
367 serr->ee.ee_data = 0;
368 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
369 serr->port = fl6->fl6_dport;
370
371 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
372 skb_reset_transport_header(skb);
373
374 if (sock_queue_err_skb(sk, skb))
375 kfree_skb(skb);
376}
377
378void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
379{
380 struct ipv6_pinfo *np = inet6_sk(sk);
381 struct ipv6hdr *iph;
382 struct sk_buff *skb;
383 struct ip6_mtuinfo *mtu_info;
384
385 if (!np->rxopt.bits.rxpmtu)
386 return;
387
388 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
389 if (!skb)
390 return;
391
392 skb_put(skb, sizeof(struct ipv6hdr));
393 skb_reset_network_header(skb);
394 iph = ipv6_hdr(skb);
395 iph->daddr = fl6->daddr;
396
397 mtu_info = IP6CBMTU(skb);
398
399 mtu_info->ip6m_mtu = mtu;
400 mtu_info->ip6m_addr.sin6_family = AF_INET6;
401 mtu_info->ip6m_addr.sin6_port = 0;
402 mtu_info->ip6m_addr.sin6_flowinfo = 0;
403 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
404 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
405
406 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
407 skb_reset_transport_header(skb);
408
409 skb = xchg(&np->rxpmtu, skb);
410 kfree_skb(skb);
411}
412
413/* For some errors we have valid addr_offset even with zero payload and
414 * zero port. Also, addr_offset should be supported if port is set.
415 */
416static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
417{
418 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
419 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
420 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
421}
422
423/* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
424 *
425 * At one point, excluding local errors was a quick test to identify icmp/icmp6
426 * errors. This is no longer true, but the test remained, so the v6 stack,
427 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
428 */
429static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
430 struct sock_exterr_skb *serr)
431{
432 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
433 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
434 return true;
435
436 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
437 return false;
438
439 if (!IP6CB(skb)->iif)
440 return false;
441
442 return true;
443}
444
445/*
446 * Handle MSG_ERRQUEUE
447 */
448int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
449{
450 struct ipv6_pinfo *np = inet6_sk(sk);
451 struct sock_exterr_skb *serr;
452 struct sk_buff *skb;
453 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
454 struct {
455 struct sock_extended_err ee;
456 struct sockaddr_in6 offender;
457 } errhdr;
458 int err;
459 int copied;
460
461 err = -EAGAIN;
462 skb = sock_dequeue_err_skb(sk);
463 if (!skb)
464 goto out;
465
466 copied = skb->len;
467 if (copied > len) {
468 msg->msg_flags |= MSG_TRUNC;
469 copied = len;
470 }
471 err = skb_copy_datagram_msg(skb, 0, msg, copied);
472 if (unlikely(err)) {
473 kfree_skb(skb);
474 return err;
475 }
476 sock_recv_timestamp(msg, sk, skb);
477
478 serr = SKB_EXT_ERR(skb);
479
480 if (sin && ipv6_datagram_support_addr(serr)) {
481 const unsigned char *nh = skb_network_header(skb);
482 sin->sin6_family = AF_INET6;
483 sin->sin6_flowinfo = 0;
484 sin->sin6_port = serr->port;
485 if (skb->protocol == htons(ETH_P_IPV6)) {
486 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
487 struct ipv6hdr, daddr);
488 sin->sin6_addr = ip6h->daddr;
489 if (np->sndflow)
490 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
491 sin->sin6_scope_id =
492 ipv6_iface_scope_id(&sin->sin6_addr,
493 IP6CB(skb)->iif);
494 } else {
495 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
496 &sin->sin6_addr);
497 sin->sin6_scope_id = 0;
498 }
499 *addr_len = sizeof(*sin);
500 }
501
502 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
503 sin = &errhdr.offender;
504 memset(sin, 0, sizeof(*sin));
505
506 if (ip6_datagram_support_cmsg(skb, serr)) {
507 sin->sin6_family = AF_INET6;
508 if (np->rxopt.all)
509 ip6_datagram_recv_common_ctl(sk, msg, skb);
510 if (skb->protocol == htons(ETH_P_IPV6)) {
511 sin->sin6_addr = ipv6_hdr(skb)->saddr;
512 if (np->rxopt.all)
513 ip6_datagram_recv_specific_ctl(sk, msg, skb);
514 sin->sin6_scope_id =
515 ipv6_iface_scope_id(&sin->sin6_addr,
516 IP6CB(skb)->iif);
517 } else {
518 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
519 &sin->sin6_addr);
520 if (inet_sk(sk)->cmsg_flags)
521 ip_cmsg_recv(msg, skb);
522 }
523 }
524
525 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
526
527 /* Now we could try to dump offended packet options */
528
529 msg->msg_flags |= MSG_ERRQUEUE;
530 err = copied;
531
532 consume_skb(skb);
533out:
534 return err;
535}
536EXPORT_SYMBOL_GPL(ipv6_recv_error);
537
538/*
539 * Handle IPV6_RECVPATHMTU
540 */
541int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
542 int *addr_len)
543{
544 struct ipv6_pinfo *np = inet6_sk(sk);
545 struct sk_buff *skb;
546 struct ip6_mtuinfo mtu_info;
547 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
548 int err;
549 int copied;
550
551 err = -EAGAIN;
552 skb = xchg(&np->rxpmtu, NULL);
553 if (!skb)
554 goto out;
555
556 copied = skb->len;
557 if (copied > len) {
558 msg->msg_flags |= MSG_TRUNC;
559 copied = len;
560 }
561 err = skb_copy_datagram_msg(skb, 0, msg, copied);
562 if (err)
563 goto out_free_skb;
564
565 sock_recv_timestamp(msg, sk, skb);
566
567 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
568
569 if (sin) {
570 sin->sin6_family = AF_INET6;
571 sin->sin6_flowinfo = 0;
572 sin->sin6_port = 0;
573 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
574 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
575 *addr_len = sizeof(*sin);
576 }
577
578 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
579
580 err = copied;
581
582out_free_skb:
583 kfree_skb(skb);
584out:
585 return err;
586}
587
588
589void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
590 struct sk_buff *skb)
591{
592 struct ipv6_pinfo *np = inet6_sk(sk);
593 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
594
595 if (np->rxopt.bits.rxinfo) {
596 struct in6_pktinfo src_info;
597
598 if (is_ipv6) {
599 src_info.ipi6_ifindex = IP6CB(skb)->iif;
600 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
601 } else {
602 src_info.ipi6_ifindex =
603 PKTINFO_SKB_CB(skb)->ipi_ifindex;
604 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
605 &src_info.ipi6_addr);
606 }
607
608 if (src_info.ipi6_ifindex >= 0)
609 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
610 sizeof(src_info), &src_info);
611 }
612}
613
614void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
615 struct sk_buff *skb)
616{
617 struct ipv6_pinfo *np = inet6_sk(sk);
618 struct inet6_skb_parm *opt = IP6CB(skb);
619 unsigned char *nh = skb_network_header(skb);
620
621 if (np->rxopt.bits.rxhlim) {
622 int hlim = ipv6_hdr(skb)->hop_limit;
623 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
624 }
625
626 if (np->rxopt.bits.rxtclass) {
627 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
628 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
629 }
630
631 if (np->rxopt.bits.rxflow) {
632 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
633 if (flowinfo)
634 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
635 }
636
637 /* HbH is allowed only once */
638 if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
639 u8 *ptr = nh + sizeof(struct ipv6hdr);
640 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
641 }
642
643 if (opt->lastopt &&
644 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
645 /*
646 * Silly enough, but we need to reparse in order to
647 * report extension headers (except for HbH)
648 * in order.
649 *
650 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
651 * (and WILL NOT be) defined because
652 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
653 */
654 unsigned int off = sizeof(struct ipv6hdr);
655 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
656
657 while (off <= opt->lastopt) {
658 unsigned int len;
659 u8 *ptr = nh + off;
660
661 switch (nexthdr) {
662 case IPPROTO_DSTOPTS:
663 nexthdr = ptr[0];
664 len = (ptr[1] + 1) << 3;
665 if (np->rxopt.bits.dstopts)
666 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
667 break;
668 case IPPROTO_ROUTING:
669 nexthdr = ptr[0];
670 len = (ptr[1] + 1) << 3;
671 if (np->rxopt.bits.srcrt)
672 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
673 break;
674 case IPPROTO_AH:
675 nexthdr = ptr[0];
676 len = (ptr[1] + 2) << 2;
677 break;
678 default:
679 nexthdr = ptr[0];
680 len = (ptr[1] + 1) << 3;
681 break;
682 }
683
684 off += len;
685 }
686 }
687
688 /* socket options in old style */
689 if (np->rxopt.bits.rxoinfo) {
690 struct in6_pktinfo src_info;
691
692 src_info.ipi6_ifindex = opt->iif;
693 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
694 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
695 }
696 if (np->rxopt.bits.rxohlim) {
697 int hlim = ipv6_hdr(skb)->hop_limit;
698 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
699 }
700 if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) {
701 u8 *ptr = nh + sizeof(struct ipv6hdr);
702 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
703 }
704 if (np->rxopt.bits.odstopts && opt->dst0) {
705 u8 *ptr = nh + opt->dst0;
706 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
707 }
708 if (np->rxopt.bits.osrcrt && opt->srcrt) {
709 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
710 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
711 }
712 if (np->rxopt.bits.odstopts && opt->dst1) {
713 u8 *ptr = nh + opt->dst1;
714 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
715 }
716 if (np->rxopt.bits.rxorigdstaddr) {
717 struct sockaddr_in6 sin6;
718 __be16 _ports[2], *ports;
719
720 ports = skb_header_pointer(skb, skb_transport_offset(skb),
721 sizeof(_ports), &_ports);
722 if (ports) {
723 /* All current transport protocols have the port numbers in the
724 * first four bytes of the transport header and this function is
725 * written with this assumption in mind.
726 */
727 sin6.sin6_family = AF_INET6;
728 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
729 sin6.sin6_port = ports[1];
730 sin6.sin6_flowinfo = 0;
731 sin6.sin6_scope_id =
732 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
733 opt->iif);
734
735 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
736 }
737 }
738 if (np->rxopt.bits.recvfragsize && opt->frag_max_size) {
739 int val = opt->frag_max_size;
740
741 put_cmsg(msg, SOL_IPV6, IPV6_RECVFRAGSIZE, sizeof(val), &val);
742 }
743}
744
745void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
746 struct sk_buff *skb)
747{
748 ip6_datagram_recv_common_ctl(sk, msg, skb);
749 ip6_datagram_recv_specific_ctl(sk, msg, skb);
750}
751EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
752
753int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
754 struct msghdr *msg, struct flowi6 *fl6,
755 struct ipcm6_cookie *ipc6)
756{
757 struct in6_pktinfo *src_info;
758 struct cmsghdr *cmsg;
759 struct ipv6_rt_hdr *rthdr;
760 struct ipv6_opt_hdr *hdr;
761 struct ipv6_txoptions *opt = ipc6->opt;
762 int len;
763 int err = 0;
764
765 for_each_cmsghdr(cmsg, msg) {
766 int addr_type;
767
768 if (!CMSG_OK(msg, cmsg)) {
769 err = -EINVAL;
770 goto exit_f;
771 }
772
773 if (cmsg->cmsg_level == SOL_SOCKET) {
774 err = __sock_cmsg_send(sk, msg, cmsg, &ipc6->sockc);
775 if (err)
776 return err;
777 continue;
778 }
779
780 if (cmsg->cmsg_level != SOL_IPV6)
781 continue;
782
783 switch (cmsg->cmsg_type) {
784 case IPV6_PKTINFO:
785 case IPV6_2292PKTINFO:
786 {
787 struct net_device *dev = NULL;
788 int src_idx;
789
790 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
791 err = -EINVAL;
792 goto exit_f;
793 }
794
795 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
796 src_idx = src_info->ipi6_ifindex;
797
798 if (src_idx) {
799 if (fl6->flowi6_oif &&
800 src_idx != fl6->flowi6_oif &&
801 (sk->sk_bound_dev_if != fl6->flowi6_oif ||
802 !sk_dev_equal_l3scope(sk, src_idx)))
803 return -EINVAL;
804 fl6->flowi6_oif = src_idx;
805 }
806
807 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
808
809 rcu_read_lock();
810 if (fl6->flowi6_oif) {
811 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
812 if (!dev) {
813 rcu_read_unlock();
814 return -ENODEV;
815 }
816 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
817 rcu_read_unlock();
818 return -EINVAL;
819 }
820
821 if (addr_type != IPV6_ADDR_ANY) {
822 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
823 if (!ipv6_can_nonlocal_bind(net, inet_sk(sk)) &&
824 !ipv6_chk_addr_and_flags(net, &src_info->ipi6_addr,
825 dev, !strict, 0,
826 IFA_F_TENTATIVE) &&
827 !ipv6_chk_acast_addr_src(net, dev,
828 &src_info->ipi6_addr))
829 err = -EINVAL;
830 else
831 fl6->saddr = src_info->ipi6_addr;
832 }
833
834 rcu_read_unlock();
835
836 if (err)
837 goto exit_f;
838
839 break;
840 }
841
842 case IPV6_FLOWINFO:
843 if (cmsg->cmsg_len < CMSG_LEN(4)) {
844 err = -EINVAL;
845 goto exit_f;
846 }
847
848 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
849 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
850 err = -EINVAL;
851 goto exit_f;
852 }
853 }
854 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
855 break;
856
857 case IPV6_2292HOPOPTS:
858 case IPV6_HOPOPTS:
859 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
860 err = -EINVAL;
861 goto exit_f;
862 }
863
864 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
865 len = ((hdr->hdrlen + 1) << 3);
866 if (cmsg->cmsg_len < CMSG_LEN(len)) {
867 err = -EINVAL;
868 goto exit_f;
869 }
870 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
871 err = -EPERM;
872 goto exit_f;
873 }
874 opt->opt_nflen += len;
875 opt->hopopt = hdr;
876 break;
877
878 case IPV6_2292DSTOPTS:
879 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
880 err = -EINVAL;
881 goto exit_f;
882 }
883
884 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
885 len = ((hdr->hdrlen + 1) << 3);
886 if (cmsg->cmsg_len < CMSG_LEN(len)) {
887 err = -EINVAL;
888 goto exit_f;
889 }
890 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
891 err = -EPERM;
892 goto exit_f;
893 }
894 if (opt->dst1opt) {
895 err = -EINVAL;
896 goto exit_f;
897 }
898 opt->opt_flen += len;
899 opt->dst1opt = hdr;
900 break;
901
902 case IPV6_DSTOPTS:
903 case IPV6_RTHDRDSTOPTS:
904 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
905 err = -EINVAL;
906 goto exit_f;
907 }
908
909 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
910 len = ((hdr->hdrlen + 1) << 3);
911 if (cmsg->cmsg_len < CMSG_LEN(len)) {
912 err = -EINVAL;
913 goto exit_f;
914 }
915 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
916 err = -EPERM;
917 goto exit_f;
918 }
919 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
920 opt->opt_flen += len;
921 opt->dst1opt = hdr;
922 } else {
923 opt->opt_nflen += len;
924 opt->dst0opt = hdr;
925 }
926 break;
927
928 case IPV6_2292RTHDR:
929 case IPV6_RTHDR:
930 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
931 err = -EINVAL;
932 goto exit_f;
933 }
934
935 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
936
937 switch (rthdr->type) {
938#if IS_ENABLED(CONFIG_IPV6_MIP6)
939 case IPV6_SRCRT_TYPE_2:
940 if (rthdr->hdrlen != 2 ||
941 rthdr->segments_left != 1) {
942 err = -EINVAL;
943 goto exit_f;
944 }
945 break;
946#endif
947 default:
948 err = -EINVAL;
949 goto exit_f;
950 }
951
952 len = ((rthdr->hdrlen + 1) << 3);
953
954 if (cmsg->cmsg_len < CMSG_LEN(len)) {
955 err = -EINVAL;
956 goto exit_f;
957 }
958
959 /* segments left must also match */
960 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
961 err = -EINVAL;
962 goto exit_f;
963 }
964
965 opt->opt_nflen += len;
966 opt->srcrt = rthdr;
967
968 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
969 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
970
971 opt->opt_nflen += dsthdrlen;
972 opt->dst0opt = opt->dst1opt;
973 opt->dst1opt = NULL;
974 opt->opt_flen -= dsthdrlen;
975 }
976
977 break;
978
979 case IPV6_2292HOPLIMIT:
980 case IPV6_HOPLIMIT:
981 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
982 err = -EINVAL;
983 goto exit_f;
984 }
985
986 ipc6->hlimit = *(int *)CMSG_DATA(cmsg);
987 if (ipc6->hlimit < -1 || ipc6->hlimit > 0xff) {
988 err = -EINVAL;
989 goto exit_f;
990 }
991
992 break;
993
994 case IPV6_TCLASS:
995 {
996 int tc;
997
998 err = -EINVAL;
999 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
1000 goto exit_f;
1001
1002 tc = *(int *)CMSG_DATA(cmsg);
1003 if (tc < -1 || tc > 0xff)
1004 goto exit_f;
1005
1006 err = 0;
1007 ipc6->tclass = tc;
1008
1009 break;
1010 }
1011
1012 case IPV6_DONTFRAG:
1013 {
1014 int df;
1015
1016 err = -EINVAL;
1017 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
1018 goto exit_f;
1019
1020 df = *(int *)CMSG_DATA(cmsg);
1021 if (df < 0 || df > 1)
1022 goto exit_f;
1023
1024 err = 0;
1025 ipc6->dontfrag = df;
1026
1027 break;
1028 }
1029 default:
1030 net_dbg_ratelimited("invalid cmsg type: %d\n",
1031 cmsg->cmsg_type);
1032 err = -EINVAL;
1033 goto exit_f;
1034 }
1035 }
1036
1037exit_f:
1038 return err;
1039}
1040EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
1041
1042void __ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
1043 __u16 srcp, __u16 destp, int rqueue, int bucket)
1044{
1045 const struct in6_addr *dest, *src;
1046
1047 dest = &sp->sk_v6_daddr;
1048 src = &sp->sk_v6_rcv_saddr;
1049 seq_printf(seq,
1050 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1051 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
1052 bucket,
1053 src->s6_addr32[0], src->s6_addr32[1],
1054 src->s6_addr32[2], src->s6_addr32[3], srcp,
1055 dest->s6_addr32[0], dest->s6_addr32[1],
1056 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1057 sp->sk_state,
1058 sk_wmem_alloc_get(sp),
1059 rqueue,
1060 0, 0L, 0,
1061 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1062 0,
1063 sock_i_ino(sp),
1064 refcount_read(&sp->sk_refcnt), sp,
1065 atomic_read(&sp->sk_drops));
1066}