tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
43int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
44{
45 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
46 struct inet_sock *inet = inet_sk(sk);
47 struct ipv6_pinfo *np = inet6_sk(sk);
48 struct in6_addr *daddr, *final_p, final;
49 struct dst_entry *dst;
50 struct flowi6 fl6;
51 struct ip6_flowlabel *flowlabel = NULL;
52 struct ipv6_txoptions *opt;
53 int addr_type;
54 int err;
55
56 if (usin->sin6_family == AF_INET) {
57 if (__ipv6_only_sock(sk))
58 return -EAFNOSUPPORT;
59 err = ip4_datagram_connect(sk, uaddr, addr_len);
60 goto ipv4_connected;
61 }
62
63 if (addr_len < SIN6_LEN_RFC2133)
64 return -EINVAL;
65
66 if (usin->sin6_family != AF_INET6)
67 return -EAFNOSUPPORT;
68
69 memset(&fl6, 0, sizeof(fl6));
70 if (np->sndflow) {
71 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
72 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
73 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
74 if (flowlabel == NULL)
75 return -EINVAL;
76 }
77 }
78
79 addr_type = ipv6_addr_type(&usin->sin6_addr);
80
81 if (addr_type == IPV6_ADDR_ANY) {
82 /*
83 * connect to self
84 */
85 usin->sin6_addr.s6_addr[15] = 0x01;
86 }
87
88 daddr = &usin->sin6_addr;
89
90 if (addr_type == IPV6_ADDR_MAPPED) {
91 struct sockaddr_in sin;
92
93 if (__ipv6_only_sock(sk)) {
94 err = -ENETUNREACH;
95 goto out;
96 }
97 sin.sin_family = AF_INET;
98 sin.sin_addr.s_addr = daddr->s6_addr32[3];
99 sin.sin_port = usin->sin6_port;
100
101 err = ip4_datagram_connect(sk,
102 (struct sockaddr *) &sin,
103 sizeof(sin));
104
105ipv4_connected:
106 if (err)
107 goto out;
108
109 ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr);
110
111 if (ipv6_addr_any(&np->saddr) ||
112 ipv6_mapped_addr_any(&np->saddr))
113 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
114
115 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
116 ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) {
117 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
118 &sk->sk_v6_rcv_saddr);
119 if (sk->sk_prot->rehash)
120 sk->sk_prot->rehash(sk);
121 }
122
123 goto out;
124 }
125
126 if (__ipv6_addr_needs_scope_id(addr_type)) {
127 if (addr_len >= sizeof(struct sockaddr_in6) &&
128 usin->sin6_scope_id) {
129 if (sk->sk_bound_dev_if &&
130 sk->sk_bound_dev_if != usin->sin6_scope_id) {
131 err = -EINVAL;
132 goto out;
133 }
134 sk->sk_bound_dev_if = usin->sin6_scope_id;
135 }
136
137 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
138 sk->sk_bound_dev_if = np->mcast_oif;
139
140 /* Connect to link-local address requires an interface */
141 if (!sk->sk_bound_dev_if) {
142 err = -EINVAL;
143 goto out;
144 }
145 }
146
147 sk->sk_v6_daddr = *daddr;
148 np->flow_label = fl6.flowlabel;
149
150 inet->inet_dport = usin->sin6_port;
151
152 /*
153 * Check for a route to destination an obtain the
154 * destination cache for it.
155 */
156
157 fl6.flowi6_proto = sk->sk_protocol;
158 fl6.daddr = sk->sk_v6_daddr;
159 fl6.saddr = np->saddr;
160 fl6.flowi6_oif = sk->sk_bound_dev_if;
161 fl6.flowi6_mark = sk->sk_mark;
162 fl6.fl6_dport = inet->inet_dport;
163 fl6.fl6_sport = inet->inet_sport;
164
165 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
166 fl6.flowi6_oif = np->mcast_oif;
167
168 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
169
170 opt = flowlabel ? flowlabel->opt : np->opt;
171 final_p = fl6_update_dst(&fl6, opt, &final);
172
173 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
174 err = 0;
175 if (IS_ERR(dst)) {
176 err = PTR_ERR(dst);
177 goto out;
178 }
179
180 /* source address lookup done in ip6_dst_lookup */
181
182 if (ipv6_addr_any(&np->saddr))
183 np->saddr = fl6.saddr;
184
185 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
186 sk->sk_v6_rcv_saddr = fl6.saddr;
187 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
188 if (sk->sk_prot->rehash)
189 sk->sk_prot->rehash(sk);
190 }
191
192 ip6_dst_store(sk, dst,
193 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
194 &sk->sk_v6_daddr : NULL,
195#ifdef CONFIG_IPV6_SUBTREES
196 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
197 &np->saddr :
198#endif
199 NULL);
200
201 sk->sk_state = TCP_ESTABLISHED;
202out:
203 fl6_sock_release(flowlabel);
204 return err;
205}
206EXPORT_SYMBOL_GPL(ip6_datagram_connect);
207
208void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
209 __be16 port, u32 info, u8 *payload)
210{
211 struct ipv6_pinfo *np = inet6_sk(sk);
212 struct icmp6hdr *icmph = icmp6_hdr(skb);
213 struct sock_exterr_skb *serr;
214
215 if (!np->recverr)
216 return;
217
218 skb = skb_clone(skb, GFP_ATOMIC);
219 if (!skb)
220 return;
221
222 skb->protocol = htons(ETH_P_IPV6);
223
224 serr = SKB_EXT_ERR(skb);
225 serr->ee.ee_errno = err;
226 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
227 serr->ee.ee_type = icmph->icmp6_type;
228 serr->ee.ee_code = icmph->icmp6_code;
229 serr->ee.ee_pad = 0;
230 serr->ee.ee_info = info;
231 serr->ee.ee_data = 0;
232 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
233 skb_network_header(skb);
234 serr->port = port;
235
236 __skb_pull(skb, payload - skb->data);
237 skb_reset_transport_header(skb);
238
239 if (sock_queue_err_skb(sk, skb))
240 kfree_skb(skb);
241}
242
243void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
244{
245 struct ipv6_pinfo *np = inet6_sk(sk);
246 struct sock_exterr_skb *serr;
247 struct ipv6hdr *iph;
248 struct sk_buff *skb;
249
250 if (!np->recverr)
251 return;
252
253 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
254 if (!skb)
255 return;
256
257 skb->protocol = htons(ETH_P_IPV6);
258
259 skb_put(skb, sizeof(struct ipv6hdr));
260 skb_reset_network_header(skb);
261 iph = ipv6_hdr(skb);
262 iph->daddr = fl6->daddr;
263
264 serr = SKB_EXT_ERR(skb);
265 serr->ee.ee_errno = err;
266 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
267 serr->ee.ee_type = 0;
268 serr->ee.ee_code = 0;
269 serr->ee.ee_pad = 0;
270 serr->ee.ee_info = info;
271 serr->ee.ee_data = 0;
272 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
273 serr->port = fl6->fl6_dport;
274
275 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
276 skb_reset_transport_header(skb);
277
278 if (sock_queue_err_skb(sk, skb))
279 kfree_skb(skb);
280}
281
282void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
283{
284 struct ipv6_pinfo *np = inet6_sk(sk);
285 struct ipv6hdr *iph;
286 struct sk_buff *skb;
287 struct ip6_mtuinfo *mtu_info;
288
289 if (!np->rxopt.bits.rxpmtu)
290 return;
291
292 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
293 if (!skb)
294 return;
295
296 skb_put(skb, sizeof(struct ipv6hdr));
297 skb_reset_network_header(skb);
298 iph = ipv6_hdr(skb);
299 iph->daddr = fl6->daddr;
300
301 mtu_info = IP6CBMTU(skb);
302
303 mtu_info->ip6m_mtu = mtu;
304 mtu_info->ip6m_addr.sin6_family = AF_INET6;
305 mtu_info->ip6m_addr.sin6_port = 0;
306 mtu_info->ip6m_addr.sin6_flowinfo = 0;
307 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
308 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
309
310 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
311 skb_reset_transport_header(skb);
312
313 skb = xchg(&np->rxpmtu, skb);
314 kfree_skb(skb);
315}
316
317/*
318 * Handle MSG_ERRQUEUE
319 */
320int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
321{
322 struct ipv6_pinfo *np = inet6_sk(sk);
323 struct sock_exterr_skb *serr;
324 struct sk_buff *skb, *skb2;
325 struct sockaddr_in6 *sin;
326 struct {
327 struct sock_extended_err ee;
328 struct sockaddr_in6 offender;
329 } errhdr;
330 int err;
331 int copied;
332
333 err = -EAGAIN;
334 skb = skb_dequeue(&sk->sk_error_queue);
335 if (skb == NULL)
336 goto out;
337
338 copied = skb->len;
339 if (copied > len) {
340 msg->msg_flags |= MSG_TRUNC;
341 copied = len;
342 }
343 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
344 if (err)
345 goto out_free_skb;
346
347 sock_recv_timestamp(msg, sk, skb);
348
349 serr = SKB_EXT_ERR(skb);
350
351 sin = (struct sockaddr_in6 *)msg->msg_name;
352 if (sin) {
353 const unsigned char *nh = skb_network_header(skb);
354 sin->sin6_family = AF_INET6;
355 sin->sin6_flowinfo = 0;
356 sin->sin6_port = serr->port;
357 if (skb->protocol == htons(ETH_P_IPV6)) {
358 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
359 struct ipv6hdr, daddr);
360 sin->sin6_addr = ip6h->daddr;
361 if (np->sndflow)
362 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
363 sin->sin6_scope_id =
364 ipv6_iface_scope_id(&sin->sin6_addr,
365 IP6CB(skb)->iif);
366 } else {
367 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
368 &sin->sin6_addr);
369 sin->sin6_scope_id = 0;
370 }
371 *addr_len = sizeof(*sin);
372 }
373
374 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
375 sin = &errhdr.offender;
376 sin->sin6_family = AF_UNSPEC;
377 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
378 sin->sin6_family = AF_INET6;
379 sin->sin6_flowinfo = 0;
380 sin->sin6_port = 0;
381 if (skb->protocol == htons(ETH_P_IPV6)) {
382 sin->sin6_addr = ipv6_hdr(skb)->saddr;
383 if (np->rxopt.all)
384 ip6_datagram_recv_ctl(sk, msg, skb);
385 sin->sin6_scope_id =
386 ipv6_iface_scope_id(&sin->sin6_addr,
387 IP6CB(skb)->iif);
388 } else {
389 struct inet_sock *inet = inet_sk(sk);
390
391 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
392 &sin->sin6_addr);
393 sin->sin6_scope_id = 0;
394 if (inet->cmsg_flags)
395 ip_cmsg_recv(msg, skb);
396 }
397 }
398
399 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
400
401 /* Now we could try to dump offended packet options */
402
403 msg->msg_flags |= MSG_ERRQUEUE;
404 err = copied;
405
406 /* Reset and regenerate socket error */
407 spin_lock_bh(&sk->sk_error_queue.lock);
408 sk->sk_err = 0;
409 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
410 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
411 spin_unlock_bh(&sk->sk_error_queue.lock);
412 sk->sk_error_report(sk);
413 } else {
414 spin_unlock_bh(&sk->sk_error_queue.lock);
415 }
416
417out_free_skb:
418 kfree_skb(skb);
419out:
420 return err;
421}
422EXPORT_SYMBOL_GPL(ipv6_recv_error);
423
424/*
425 * Handle IPV6_RECVPATHMTU
426 */
427int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
428 int *addr_len)
429{
430 struct ipv6_pinfo *np = inet6_sk(sk);
431 struct sk_buff *skb;
432 struct sockaddr_in6 *sin;
433 struct ip6_mtuinfo mtu_info;
434 int err;
435 int copied;
436
437 err = -EAGAIN;
438 skb = xchg(&np->rxpmtu, NULL);
439 if (skb == NULL)
440 goto out;
441
442 copied = skb->len;
443 if (copied > len) {
444 msg->msg_flags |= MSG_TRUNC;
445 copied = len;
446 }
447 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
448 if (err)
449 goto out_free_skb;
450
451 sock_recv_timestamp(msg, sk, skb);
452
453 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
454
455 sin = (struct sockaddr_in6 *)msg->msg_name;
456 if (sin) {
457 sin->sin6_family = AF_INET6;
458 sin->sin6_flowinfo = 0;
459 sin->sin6_port = 0;
460 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
461 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
462 *addr_len = sizeof(*sin);
463 }
464
465 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
466
467 err = copied;
468
469out_free_skb:
470 kfree_skb(skb);
471out:
472 return err;
473}
474
475
476int ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
477 struct sk_buff *skb)
478{
479 struct ipv6_pinfo *np = inet6_sk(sk);
480 struct inet6_skb_parm *opt = IP6CB(skb);
481 unsigned char *nh = skb_network_header(skb);
482
483 if (np->rxopt.bits.rxinfo) {
484 struct in6_pktinfo src_info;
485
486 src_info.ipi6_ifindex = opt->iif;
487 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
488 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
489 }
490
491 if (np->rxopt.bits.rxhlim) {
492 int hlim = ipv6_hdr(skb)->hop_limit;
493 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
494 }
495
496 if (np->rxopt.bits.rxtclass) {
497 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
498 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
499 }
500
501 if (np->rxopt.bits.rxflow) {
502 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
503 if (flowinfo)
504 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
505 }
506
507 /* HbH is allowed only once */
508 if (np->rxopt.bits.hopopts && opt->hop) {
509 u8 *ptr = nh + opt->hop;
510 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
511 }
512
513 if (opt->lastopt &&
514 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
515 /*
516 * Silly enough, but we need to reparse in order to
517 * report extension headers (except for HbH)
518 * in order.
519 *
520 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
521 * (and WILL NOT be) defined because
522 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
523 */
524 unsigned int off = sizeof(struct ipv6hdr);
525 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
526
527 while (off <= opt->lastopt) {
528 unsigned int len;
529 u8 *ptr = nh + off;
530
531 switch (nexthdr) {
532 case IPPROTO_DSTOPTS:
533 nexthdr = ptr[0];
534 len = (ptr[1] + 1) << 3;
535 if (np->rxopt.bits.dstopts)
536 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
537 break;
538 case IPPROTO_ROUTING:
539 nexthdr = ptr[0];
540 len = (ptr[1] + 1) << 3;
541 if (np->rxopt.bits.srcrt)
542 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
543 break;
544 case IPPROTO_AH:
545 nexthdr = ptr[0];
546 len = (ptr[1] + 2) << 2;
547 break;
548 default:
549 nexthdr = ptr[0];
550 len = (ptr[1] + 1) << 3;
551 break;
552 }
553
554 off += len;
555 }
556 }
557
558 /* socket options in old style */
559 if (np->rxopt.bits.rxoinfo) {
560 struct in6_pktinfo src_info;
561
562 src_info.ipi6_ifindex = opt->iif;
563 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
564 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
565 }
566 if (np->rxopt.bits.rxohlim) {
567 int hlim = ipv6_hdr(skb)->hop_limit;
568 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
569 }
570 if (np->rxopt.bits.ohopopts && opt->hop) {
571 u8 *ptr = nh + opt->hop;
572 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
573 }
574 if (np->rxopt.bits.odstopts && opt->dst0) {
575 u8 *ptr = nh + opt->dst0;
576 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
577 }
578 if (np->rxopt.bits.osrcrt && opt->srcrt) {
579 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
580 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
581 }
582 if (np->rxopt.bits.odstopts && opt->dst1) {
583 u8 *ptr = nh + opt->dst1;
584 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
585 }
586 if (np->rxopt.bits.rxorigdstaddr) {
587 struct sockaddr_in6 sin6;
588 __be16 *ports = (__be16 *) skb_transport_header(skb);
589
590 if (skb_transport_offset(skb) + 4 <= skb->len) {
591 /* All current transport protocols have the port numbers in the
592 * first four bytes of the transport header and this function is
593 * written with this assumption in mind.
594 */
595
596 sin6.sin6_family = AF_INET6;
597 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
598 sin6.sin6_port = ports[1];
599 sin6.sin6_flowinfo = 0;
600 sin6.sin6_scope_id =
601 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
602 opt->iif);
603
604 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
605 }
606 }
607 return 0;
608}
609EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
610
611int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
612 struct msghdr *msg, struct flowi6 *fl6,
613 struct ipv6_txoptions *opt,
614 int *hlimit, int *tclass, int *dontfrag)
615{
616 struct in6_pktinfo *src_info;
617 struct cmsghdr *cmsg;
618 struct ipv6_rt_hdr *rthdr;
619 struct ipv6_opt_hdr *hdr;
620 int len;
621 int err = 0;
622
623 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
624 int addr_type;
625
626 if (!CMSG_OK(msg, cmsg)) {
627 err = -EINVAL;
628 goto exit_f;
629 }
630
631 if (cmsg->cmsg_level != SOL_IPV6)
632 continue;
633
634 switch (cmsg->cmsg_type) {
635 case IPV6_PKTINFO:
636 case IPV6_2292PKTINFO:
637 {
638 struct net_device *dev = NULL;
639
640 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
641 err = -EINVAL;
642 goto exit_f;
643 }
644
645 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
646
647 if (src_info->ipi6_ifindex) {
648 if (fl6->flowi6_oif &&
649 src_info->ipi6_ifindex != fl6->flowi6_oif)
650 return -EINVAL;
651 fl6->flowi6_oif = src_info->ipi6_ifindex;
652 }
653
654 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
655
656 rcu_read_lock();
657 if (fl6->flowi6_oif) {
658 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
659 if (!dev) {
660 rcu_read_unlock();
661 return -ENODEV;
662 }
663 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
664 rcu_read_unlock();
665 return -EINVAL;
666 }
667
668 if (addr_type != IPV6_ADDR_ANY) {
669 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
670 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
671 !ipv6_chk_addr(net, &src_info->ipi6_addr,
672 strict ? dev : NULL, 0))
673 err = -EINVAL;
674 else
675 fl6->saddr = src_info->ipi6_addr;
676 }
677
678 rcu_read_unlock();
679
680 if (err)
681 goto exit_f;
682
683 break;
684 }
685
686 case IPV6_FLOWINFO:
687 if (cmsg->cmsg_len < CMSG_LEN(4)) {
688 err = -EINVAL;
689 goto exit_f;
690 }
691
692 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
693 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
694 err = -EINVAL;
695 goto exit_f;
696 }
697 }
698 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
699 break;
700
701 case IPV6_2292HOPOPTS:
702 case IPV6_HOPOPTS:
703 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
704 err = -EINVAL;
705 goto exit_f;
706 }
707
708 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
709 len = ((hdr->hdrlen + 1) << 3);
710 if (cmsg->cmsg_len < CMSG_LEN(len)) {
711 err = -EINVAL;
712 goto exit_f;
713 }
714 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
715 err = -EPERM;
716 goto exit_f;
717 }
718 opt->opt_nflen += len;
719 opt->hopopt = hdr;
720 break;
721
722 case IPV6_2292DSTOPTS:
723 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
724 err = -EINVAL;
725 goto exit_f;
726 }
727
728 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
729 len = ((hdr->hdrlen + 1) << 3);
730 if (cmsg->cmsg_len < CMSG_LEN(len)) {
731 err = -EINVAL;
732 goto exit_f;
733 }
734 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
735 err = -EPERM;
736 goto exit_f;
737 }
738 if (opt->dst1opt) {
739 err = -EINVAL;
740 goto exit_f;
741 }
742 opt->opt_flen += len;
743 opt->dst1opt = hdr;
744 break;
745
746 case IPV6_DSTOPTS:
747 case IPV6_RTHDRDSTOPTS:
748 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
749 err = -EINVAL;
750 goto exit_f;
751 }
752
753 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
754 len = ((hdr->hdrlen + 1) << 3);
755 if (cmsg->cmsg_len < CMSG_LEN(len)) {
756 err = -EINVAL;
757 goto exit_f;
758 }
759 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
760 err = -EPERM;
761 goto exit_f;
762 }
763 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
764 opt->opt_flen += len;
765 opt->dst1opt = hdr;
766 } else {
767 opt->opt_nflen += len;
768 opt->dst0opt = hdr;
769 }
770 break;
771
772 case IPV6_2292RTHDR:
773 case IPV6_RTHDR:
774 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
775 err = -EINVAL;
776 goto exit_f;
777 }
778
779 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
780
781 switch (rthdr->type) {
782#if IS_ENABLED(CONFIG_IPV6_MIP6)
783 case IPV6_SRCRT_TYPE_2:
784 if (rthdr->hdrlen != 2 ||
785 rthdr->segments_left != 1) {
786 err = -EINVAL;
787 goto exit_f;
788 }
789 break;
790#endif
791 default:
792 err = -EINVAL;
793 goto exit_f;
794 }
795
796 len = ((rthdr->hdrlen + 1) << 3);
797
798 if (cmsg->cmsg_len < CMSG_LEN(len)) {
799 err = -EINVAL;
800 goto exit_f;
801 }
802
803 /* segments left must also match */
804 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
805 err = -EINVAL;
806 goto exit_f;
807 }
808
809 opt->opt_nflen += len;
810 opt->srcrt = rthdr;
811
812 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
813 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
814
815 opt->opt_nflen += dsthdrlen;
816 opt->dst0opt = opt->dst1opt;
817 opt->dst1opt = NULL;
818 opt->opt_flen -= dsthdrlen;
819 }
820
821 break;
822
823 case IPV6_2292HOPLIMIT:
824 case IPV6_HOPLIMIT:
825 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
826 err = -EINVAL;
827 goto exit_f;
828 }
829
830 *hlimit = *(int *)CMSG_DATA(cmsg);
831 if (*hlimit < -1 || *hlimit > 0xff) {
832 err = -EINVAL;
833 goto exit_f;
834 }
835
836 break;
837
838 case IPV6_TCLASS:
839 {
840 int tc;
841
842 err = -EINVAL;
843 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
844 goto exit_f;
845
846 tc = *(int *)CMSG_DATA(cmsg);
847 if (tc < -1 || tc > 0xff)
848 goto exit_f;
849
850 err = 0;
851 *tclass = tc;
852
853 break;
854 }
855
856 case IPV6_DONTFRAG:
857 {
858 int df;
859
860 err = -EINVAL;
861 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
862 goto exit_f;
863
864 df = *(int *)CMSG_DATA(cmsg);
865 if (df < 0 || df > 1)
866 goto exit_f;
867
868 err = 0;
869 *dontfrag = df;
870
871 break;
872 }
873 default:
874 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
875 cmsg->cmsg_type);
876 err = -EINVAL;
877 goto exit_f;
878 }
879 }
880
881exit_f:
882 return err;
883}
884EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
885
886void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
887 __u16 srcp, __u16 destp, int bucket)
888{
889 const struct in6_addr *dest, *src;
890
891 dest = &sp->sk_v6_daddr;
892 src = &sp->sk_v6_rcv_saddr;
893 seq_printf(seq,
894 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
895 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
896 bucket,
897 src->s6_addr32[0], src->s6_addr32[1],
898 src->s6_addr32[2], src->s6_addr32[3], srcp,
899 dest->s6_addr32[0], dest->s6_addr32[1],
900 dest->s6_addr32[2], dest->s6_addr32[3], destp,
901 sp->sk_state,
902 sk_wmem_alloc_get(sp),
903 sk_rmem_alloc_get(sp),
904 0, 0L, 0,
905 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
906 0,
907 sock_i_ino(sp),
908 atomic_read(&sp->sk_refcnt), sp,
909 atomic_read(&sp->sk_drops));
910}