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