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net: add build-time checks for msg->msg_name size
[deliverable/linux.git] / net / ipv6 / datagram.c
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
38 static bool ipv6_mapped_addr_any(const struct in6_addr *a)
39 {
40 return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0);
41 }
42
43 int 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
105 ipv4_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);
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;
202 out:
203 fl6_sock_release(flowlabel);
204 return err;
205 }
206 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
207
208 void 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
243 void 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
282 void 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 */
320 int 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 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
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 if (sin) {
352 const unsigned char *nh = skb_network_header(skb);
353 sin->sin6_family = AF_INET6;
354 sin->sin6_flowinfo = 0;
355 sin->sin6_port = serr->port;
356 if (skb->protocol == htons(ETH_P_IPV6)) {
357 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
358 struct ipv6hdr, daddr);
359 sin->sin6_addr = ip6h->daddr;
360 if (np->sndflow)
361 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
362 sin->sin6_scope_id =
363 ipv6_iface_scope_id(&sin->sin6_addr,
364 IP6CB(skb)->iif);
365 } else {
366 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
367 &sin->sin6_addr);
368 sin->sin6_scope_id = 0;
369 }
370 *addr_len = sizeof(*sin);
371 }
372
373 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
374 sin = &errhdr.offender;
375 sin->sin6_family = AF_UNSPEC;
376 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
377 sin->sin6_family = AF_INET6;
378 sin->sin6_flowinfo = 0;
379 sin->sin6_port = 0;
380 if (skb->protocol == htons(ETH_P_IPV6)) {
381 sin->sin6_addr = ipv6_hdr(skb)->saddr;
382 if (np->rxopt.all)
383 ip6_datagram_recv_ctl(sk, msg, skb);
384 sin->sin6_scope_id =
385 ipv6_iface_scope_id(&sin->sin6_addr,
386 IP6CB(skb)->iif);
387 } else {
388 struct inet_sock *inet = inet_sk(sk);
389
390 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
391 &sin->sin6_addr);
392 sin->sin6_scope_id = 0;
393 if (inet->cmsg_flags)
394 ip_cmsg_recv(msg, skb);
395 }
396 }
397
398 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
399
400 /* Now we could try to dump offended packet options */
401
402 msg->msg_flags |= MSG_ERRQUEUE;
403 err = copied;
404
405 /* Reset and regenerate socket error */
406 spin_lock_bh(&sk->sk_error_queue.lock);
407 sk->sk_err = 0;
408 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
409 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
410 spin_unlock_bh(&sk->sk_error_queue.lock);
411 sk->sk_error_report(sk);
412 } else {
413 spin_unlock_bh(&sk->sk_error_queue.lock);
414 }
415
416 out_free_skb:
417 kfree_skb(skb);
418 out:
419 return err;
420 }
421 EXPORT_SYMBOL_GPL(ipv6_recv_error);
422
423 /*
424 * Handle IPV6_RECVPATHMTU
425 */
426 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
427 int *addr_len)
428 {
429 struct ipv6_pinfo *np = inet6_sk(sk);
430 struct sk_buff *skb;
431 struct ip6_mtuinfo mtu_info;
432 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
433 int err;
434 int copied;
435
436 err = -EAGAIN;
437 skb = xchg(&np->rxpmtu, NULL);
438 if (skb == NULL)
439 goto out;
440
441 copied = skb->len;
442 if (copied > len) {
443 msg->msg_flags |= MSG_TRUNC;
444 copied = len;
445 }
446 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
447 if (err)
448 goto out_free_skb;
449
450 sock_recv_timestamp(msg, sk, skb);
451
452 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
453
454 if (sin) {
455 sin->sin6_family = AF_INET6;
456 sin->sin6_flowinfo = 0;
457 sin->sin6_port = 0;
458 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
459 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
460 *addr_len = sizeof(*sin);
461 }
462
463 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
464
465 err = copied;
466
467 out_free_skb:
468 kfree_skb(skb);
469 out:
470 return err;
471 }
472
473
474 int ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
475 struct sk_buff *skb)
476 {
477 struct ipv6_pinfo *np = inet6_sk(sk);
478 struct inet6_skb_parm *opt = IP6CB(skb);
479 unsigned char *nh = skb_network_header(skb);
480
481 if (np->rxopt.bits.rxinfo) {
482 struct in6_pktinfo src_info;
483
484 src_info.ipi6_ifindex = opt->iif;
485 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
486 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
487 }
488
489 if (np->rxopt.bits.rxhlim) {
490 int hlim = ipv6_hdr(skb)->hop_limit;
491 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
492 }
493
494 if (np->rxopt.bits.rxtclass) {
495 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
496 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
497 }
498
499 if (np->rxopt.bits.rxflow) {
500 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
501 if (flowinfo)
502 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
503 }
504
505 /* HbH is allowed only once */
506 if (np->rxopt.bits.hopopts && opt->hop) {
507 u8 *ptr = nh + opt->hop;
508 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
509 }
510
511 if (opt->lastopt &&
512 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
513 /*
514 * Silly enough, but we need to reparse in order to
515 * report extension headers (except for HbH)
516 * in order.
517 *
518 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
519 * (and WILL NOT be) defined because
520 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
521 */
522 unsigned int off = sizeof(struct ipv6hdr);
523 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
524
525 while (off <= opt->lastopt) {
526 unsigned int len;
527 u8 *ptr = nh + off;
528
529 switch (nexthdr) {
530 case IPPROTO_DSTOPTS:
531 nexthdr = ptr[0];
532 len = (ptr[1] + 1) << 3;
533 if (np->rxopt.bits.dstopts)
534 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
535 break;
536 case IPPROTO_ROUTING:
537 nexthdr = ptr[0];
538 len = (ptr[1] + 1) << 3;
539 if (np->rxopt.bits.srcrt)
540 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
541 break;
542 case IPPROTO_AH:
543 nexthdr = ptr[0];
544 len = (ptr[1] + 2) << 2;
545 break;
546 default:
547 nexthdr = ptr[0];
548 len = (ptr[1] + 1) << 3;
549 break;
550 }
551
552 off += len;
553 }
554 }
555
556 /* socket options in old style */
557 if (np->rxopt.bits.rxoinfo) {
558 struct in6_pktinfo src_info;
559
560 src_info.ipi6_ifindex = opt->iif;
561 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
562 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
563 }
564 if (np->rxopt.bits.rxohlim) {
565 int hlim = ipv6_hdr(skb)->hop_limit;
566 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
567 }
568 if (np->rxopt.bits.ohopopts && opt->hop) {
569 u8 *ptr = nh + opt->hop;
570 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
571 }
572 if (np->rxopt.bits.odstopts && opt->dst0) {
573 u8 *ptr = nh + opt->dst0;
574 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
575 }
576 if (np->rxopt.bits.osrcrt && opt->srcrt) {
577 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
578 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
579 }
580 if (np->rxopt.bits.odstopts && opt->dst1) {
581 u8 *ptr = nh + opt->dst1;
582 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
583 }
584 if (np->rxopt.bits.rxorigdstaddr) {
585 struct sockaddr_in6 sin6;
586 __be16 *ports = (__be16 *) skb_transport_header(skb);
587
588 if (skb_transport_offset(skb) + 4 <= skb->len) {
589 /* All current transport protocols have the port numbers in the
590 * first four bytes of the transport header and this function is
591 * written with this assumption in mind.
592 */
593
594 sin6.sin6_family = AF_INET6;
595 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
596 sin6.sin6_port = ports[1];
597 sin6.sin6_flowinfo = 0;
598 sin6.sin6_scope_id =
599 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
600 opt->iif);
601
602 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
603 }
604 }
605 return 0;
606 }
607 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
608
609 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
610 struct msghdr *msg, struct flowi6 *fl6,
611 struct ipv6_txoptions *opt,
612 int *hlimit, int *tclass, int *dontfrag)
613 {
614 struct in6_pktinfo *src_info;
615 struct cmsghdr *cmsg;
616 struct ipv6_rt_hdr *rthdr;
617 struct ipv6_opt_hdr *hdr;
618 int len;
619 int err = 0;
620
621 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
622 int addr_type;
623
624 if (!CMSG_OK(msg, cmsg)) {
625 err = -EINVAL;
626 goto exit_f;
627 }
628
629 if (cmsg->cmsg_level != SOL_IPV6)
630 continue;
631
632 switch (cmsg->cmsg_type) {
633 case IPV6_PKTINFO:
634 case IPV6_2292PKTINFO:
635 {
636 struct net_device *dev = NULL;
637
638 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
639 err = -EINVAL;
640 goto exit_f;
641 }
642
643 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
644
645 if (src_info->ipi6_ifindex) {
646 if (fl6->flowi6_oif &&
647 src_info->ipi6_ifindex != fl6->flowi6_oif)
648 return -EINVAL;
649 fl6->flowi6_oif = src_info->ipi6_ifindex;
650 }
651
652 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
653
654 rcu_read_lock();
655 if (fl6->flowi6_oif) {
656 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
657 if (!dev) {
658 rcu_read_unlock();
659 return -ENODEV;
660 }
661 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
662 rcu_read_unlock();
663 return -EINVAL;
664 }
665
666 if (addr_type != IPV6_ADDR_ANY) {
667 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
668 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
669 !ipv6_chk_addr(net, &src_info->ipi6_addr,
670 strict ? dev : NULL, 0))
671 err = -EINVAL;
672 else
673 fl6->saddr = src_info->ipi6_addr;
674 }
675
676 rcu_read_unlock();
677
678 if (err)
679 goto exit_f;
680
681 break;
682 }
683
684 case IPV6_FLOWINFO:
685 if (cmsg->cmsg_len < CMSG_LEN(4)) {
686 err = -EINVAL;
687 goto exit_f;
688 }
689
690 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
691 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
692 err = -EINVAL;
693 goto exit_f;
694 }
695 }
696 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
697 break;
698
699 case IPV6_2292HOPOPTS:
700 case IPV6_HOPOPTS:
701 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
702 err = -EINVAL;
703 goto exit_f;
704 }
705
706 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
707 len = ((hdr->hdrlen + 1) << 3);
708 if (cmsg->cmsg_len < CMSG_LEN(len)) {
709 err = -EINVAL;
710 goto exit_f;
711 }
712 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
713 err = -EPERM;
714 goto exit_f;
715 }
716 opt->opt_nflen += len;
717 opt->hopopt = hdr;
718 break;
719
720 case IPV6_2292DSTOPTS:
721 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
722 err = -EINVAL;
723 goto exit_f;
724 }
725
726 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
727 len = ((hdr->hdrlen + 1) << 3);
728 if (cmsg->cmsg_len < CMSG_LEN(len)) {
729 err = -EINVAL;
730 goto exit_f;
731 }
732 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
733 err = -EPERM;
734 goto exit_f;
735 }
736 if (opt->dst1opt) {
737 err = -EINVAL;
738 goto exit_f;
739 }
740 opt->opt_flen += len;
741 opt->dst1opt = hdr;
742 break;
743
744 case IPV6_DSTOPTS:
745 case IPV6_RTHDRDSTOPTS:
746 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
747 err = -EINVAL;
748 goto exit_f;
749 }
750
751 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
752 len = ((hdr->hdrlen + 1) << 3);
753 if (cmsg->cmsg_len < CMSG_LEN(len)) {
754 err = -EINVAL;
755 goto exit_f;
756 }
757 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
758 err = -EPERM;
759 goto exit_f;
760 }
761 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
762 opt->opt_flen += len;
763 opt->dst1opt = hdr;
764 } else {
765 opt->opt_nflen += len;
766 opt->dst0opt = hdr;
767 }
768 break;
769
770 case IPV6_2292RTHDR:
771 case IPV6_RTHDR:
772 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
773 err = -EINVAL;
774 goto exit_f;
775 }
776
777 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
778
779 switch (rthdr->type) {
780 #if IS_ENABLED(CONFIG_IPV6_MIP6)
781 case IPV6_SRCRT_TYPE_2:
782 if (rthdr->hdrlen != 2 ||
783 rthdr->segments_left != 1) {
784 err = -EINVAL;
785 goto exit_f;
786 }
787 break;
788 #endif
789 default:
790 err = -EINVAL;
791 goto exit_f;
792 }
793
794 len = ((rthdr->hdrlen + 1) << 3);
795
796 if (cmsg->cmsg_len < CMSG_LEN(len)) {
797 err = -EINVAL;
798 goto exit_f;
799 }
800
801 /* segments left must also match */
802 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
803 err = -EINVAL;
804 goto exit_f;
805 }
806
807 opt->opt_nflen += len;
808 opt->srcrt = rthdr;
809
810 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
811 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
812
813 opt->opt_nflen += dsthdrlen;
814 opt->dst0opt = opt->dst1opt;
815 opt->dst1opt = NULL;
816 opt->opt_flen -= dsthdrlen;
817 }
818
819 break;
820
821 case IPV6_2292HOPLIMIT:
822 case IPV6_HOPLIMIT:
823 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
824 err = -EINVAL;
825 goto exit_f;
826 }
827
828 *hlimit = *(int *)CMSG_DATA(cmsg);
829 if (*hlimit < -1 || *hlimit > 0xff) {
830 err = -EINVAL;
831 goto exit_f;
832 }
833
834 break;
835
836 case IPV6_TCLASS:
837 {
838 int tc;
839
840 err = -EINVAL;
841 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
842 goto exit_f;
843
844 tc = *(int *)CMSG_DATA(cmsg);
845 if (tc < -1 || tc > 0xff)
846 goto exit_f;
847
848 err = 0;
849 *tclass = tc;
850
851 break;
852 }
853
854 case IPV6_DONTFRAG:
855 {
856 int df;
857
858 err = -EINVAL;
859 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
860 goto exit_f;
861
862 df = *(int *)CMSG_DATA(cmsg);
863 if (df < 0 || df > 1)
864 goto exit_f;
865
866 err = 0;
867 *dontfrag = df;
868
869 break;
870 }
871 default:
872 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
873 cmsg->cmsg_type);
874 err = -EINVAL;
875 goto exit_f;
876 }
877 }
878
879 exit_f:
880 return err;
881 }
882 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
883
884 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
885 __u16 srcp, __u16 destp, int bucket)
886 {
887 const struct in6_addr *dest, *src;
888
889 dest = &sp->sk_v6_daddr;
890 src = &sp->sk_v6_rcv_saddr;
891 seq_printf(seq,
892 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
893 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
894 bucket,
895 src->s6_addr32[0], src->s6_addr32[1],
896 src->s6_addr32[2], src->s6_addr32[3], srcp,
897 dest->s6_addr32[0], dest->s6_addr32[1],
898 dest->s6_addr32[2], dest->s6_addr32[3], destp,
899 sp->sk_state,
900 sk_wmem_alloc_get(sp),
901 sk_rmem_alloc_get(sp),
902 0, 0L, 0,
903 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
904 0,
905 sock_i_ino(sp),
906 atomic_read(&sp->sk_refcnt), sp,
907 atomic_read(&sp->sk_drops));
908 }
Linux kernel - Deliverables
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