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