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