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x86/fpu, sched: Dynamically allocate 'struct fpu'
[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)
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 ip6_set_txhash(sk);
203 out:
204 fl6_sock_release(flowlabel);
205 return err;
206 }
207 EXPORT_SYMBOL_GPL(ip6_datagram_connect);
208
209 int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
210 int addr_len)
211 {
212 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr);
213 if (sin6->sin6_family != AF_INET6)
214 return -EAFNOSUPPORT;
215 return ip6_datagram_connect(sk, uaddr, addr_len);
216 }
217 EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
218
219 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
220 __be16 port, u32 info, u8 *payload)
221 {
222 struct ipv6_pinfo *np = inet6_sk(sk);
223 struct icmp6hdr *icmph = icmp6_hdr(skb);
224 struct sock_exterr_skb *serr;
225
226 if (!np->recverr)
227 return;
228
229 skb = skb_clone(skb, GFP_ATOMIC);
230 if (!skb)
231 return;
232
233 skb->protocol = htons(ETH_P_IPV6);
234
235 serr = SKB_EXT_ERR(skb);
236 serr->ee.ee_errno = err;
237 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
238 serr->ee.ee_type = icmph->icmp6_type;
239 serr->ee.ee_code = icmph->icmp6_code;
240 serr->ee.ee_pad = 0;
241 serr->ee.ee_info = info;
242 serr->ee.ee_data = 0;
243 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
244 skb_network_header(skb);
245 serr->port = port;
246
247 __skb_pull(skb, payload - skb->data);
248 skb_reset_transport_header(skb);
249
250 if (sock_queue_err_skb(sk, skb))
251 kfree_skb(skb);
252 }
253
254 void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
255 {
256 struct ipv6_pinfo *np = inet6_sk(sk);
257 struct sock_exterr_skb *serr;
258 struct ipv6hdr *iph;
259 struct sk_buff *skb;
260
261 if (!np->recverr)
262 return;
263
264 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
265 if (!skb)
266 return;
267
268 skb->protocol = htons(ETH_P_IPV6);
269
270 skb_put(skb, sizeof(struct ipv6hdr));
271 skb_reset_network_header(skb);
272 iph = ipv6_hdr(skb);
273 iph->daddr = fl6->daddr;
274
275 serr = SKB_EXT_ERR(skb);
276 serr->ee.ee_errno = err;
277 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
278 serr->ee.ee_type = 0;
279 serr->ee.ee_code = 0;
280 serr->ee.ee_pad = 0;
281 serr->ee.ee_info = info;
282 serr->ee.ee_data = 0;
283 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
284 serr->port = fl6->fl6_dport;
285
286 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
287 skb_reset_transport_header(skb);
288
289 if (sock_queue_err_skb(sk, skb))
290 kfree_skb(skb);
291 }
292
293 void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
294 {
295 struct ipv6_pinfo *np = inet6_sk(sk);
296 struct ipv6hdr *iph;
297 struct sk_buff *skb;
298 struct ip6_mtuinfo *mtu_info;
299
300 if (!np->rxopt.bits.rxpmtu)
301 return;
302
303 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
304 if (!skb)
305 return;
306
307 skb_put(skb, sizeof(struct ipv6hdr));
308 skb_reset_network_header(skb);
309 iph = ipv6_hdr(skb);
310 iph->daddr = fl6->daddr;
311
312 mtu_info = IP6CBMTU(skb);
313
314 mtu_info->ip6m_mtu = mtu;
315 mtu_info->ip6m_addr.sin6_family = AF_INET6;
316 mtu_info->ip6m_addr.sin6_port = 0;
317 mtu_info->ip6m_addr.sin6_flowinfo = 0;
318 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
319 mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr;
320
321 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
322 skb_reset_transport_header(skb);
323
324 skb = xchg(&np->rxpmtu, skb);
325 kfree_skb(skb);
326 }
327
328 /* For some errors we have valid addr_offset even with zero payload and
329 * zero port. Also, addr_offset should be supported if port is set.
330 */
331 static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr)
332 {
333 return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 ||
334 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
335 serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
336 }
337
338 /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL.
339 *
340 * At one point, excluding local errors was a quick test to identify icmp/icmp6
341 * errors. This is no longer true, but the test remained, so the v6 stack,
342 * unlike v4, also honors cmsg requests on all wifi and timestamp errors.
343 *
344 * Timestamp code paths do not initialize the fields expected by cmsg:
345 * the PKTINFO fields in skb->cb[]. Fill those in here.
346 */
347 static bool ip6_datagram_support_cmsg(struct sk_buff *skb,
348 struct sock_exterr_skb *serr)
349 {
350 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
351 serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6)
352 return true;
353
354 if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL)
355 return false;
356
357 if (!skb->dev)
358 return false;
359
360 if (skb->protocol == htons(ETH_P_IPV6))
361 IP6CB(skb)->iif = skb->dev->ifindex;
362 else
363 PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex;
364
365 return true;
366 }
367
368 /*
369 * Handle MSG_ERRQUEUE
370 */
371 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
372 {
373 struct ipv6_pinfo *np = inet6_sk(sk);
374 struct sock_exterr_skb *serr;
375 struct sk_buff *skb;
376 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
377 struct {
378 struct sock_extended_err ee;
379 struct sockaddr_in6 offender;
380 } errhdr;
381 int err;
382 int copied;
383
384 err = -EAGAIN;
385 skb = sock_dequeue_err_skb(sk);
386 if (!skb)
387 goto out;
388
389 copied = skb->len;
390 if (copied > len) {
391 msg->msg_flags |= MSG_TRUNC;
392 copied = len;
393 }
394 err = skb_copy_datagram_msg(skb, 0, msg, copied);
395 if (err)
396 goto out_free_skb;
397
398 sock_recv_timestamp(msg, sk, skb);
399
400 serr = SKB_EXT_ERR(skb);
401
402 if (sin && ipv6_datagram_support_addr(serr)) {
403 const unsigned char *nh = skb_network_header(skb);
404 sin->sin6_family = AF_INET6;
405 sin->sin6_flowinfo = 0;
406 sin->sin6_port = serr->port;
407 if (skb->protocol == htons(ETH_P_IPV6)) {
408 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
409 struct ipv6hdr, daddr);
410 sin->sin6_addr = ip6h->daddr;
411 if (np->sndflow)
412 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
413 sin->sin6_scope_id =
414 ipv6_iface_scope_id(&sin->sin6_addr,
415 IP6CB(skb)->iif);
416 } else {
417 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
418 &sin->sin6_addr);
419 sin->sin6_scope_id = 0;
420 }
421 *addr_len = sizeof(*sin);
422 }
423
424 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
425 sin = &errhdr.offender;
426 memset(sin, 0, sizeof(*sin));
427
428 if (ip6_datagram_support_cmsg(skb, serr)) {
429 sin->sin6_family = AF_INET6;
430 if (np->rxopt.all)
431 ip6_datagram_recv_common_ctl(sk, msg, skb);
432 if (skb->protocol == htons(ETH_P_IPV6)) {
433 sin->sin6_addr = ipv6_hdr(skb)->saddr;
434 if (np->rxopt.all)
435 ip6_datagram_recv_specific_ctl(sk, msg, skb);
436 sin->sin6_scope_id =
437 ipv6_iface_scope_id(&sin->sin6_addr,
438 IP6CB(skb)->iif);
439 } else {
440 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
441 &sin->sin6_addr);
442 if (inet_sk(sk)->cmsg_flags)
443 ip_cmsg_recv(msg, skb);
444 }
445 }
446
447 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
448
449 /* Now we could try to dump offended packet options */
450
451 msg->msg_flags |= MSG_ERRQUEUE;
452 err = copied;
453
454 out_free_skb:
455 kfree_skb(skb);
456 out:
457 return err;
458 }
459 EXPORT_SYMBOL_GPL(ipv6_recv_error);
460
461 /*
462 * Handle IPV6_RECVPATHMTU
463 */
464 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
465 int *addr_len)
466 {
467 struct ipv6_pinfo *np = inet6_sk(sk);
468 struct sk_buff *skb;
469 struct ip6_mtuinfo mtu_info;
470 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
471 int err;
472 int copied;
473
474 err = -EAGAIN;
475 skb = xchg(&np->rxpmtu, NULL);
476 if (!skb)
477 goto out;
478
479 copied = skb->len;
480 if (copied > len) {
481 msg->msg_flags |= MSG_TRUNC;
482 copied = len;
483 }
484 err = skb_copy_datagram_msg(skb, 0, msg, copied);
485 if (err)
486 goto out_free_skb;
487
488 sock_recv_timestamp(msg, sk, skb);
489
490 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
491
492 if (sin) {
493 sin->sin6_family = AF_INET6;
494 sin->sin6_flowinfo = 0;
495 sin->sin6_port = 0;
496 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
497 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
498 *addr_len = sizeof(*sin);
499 }
500
501 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
502
503 err = copied;
504
505 out_free_skb:
506 kfree_skb(skb);
507 out:
508 return err;
509 }
510
511
512 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
513 struct sk_buff *skb)
514 {
515 struct ipv6_pinfo *np = inet6_sk(sk);
516 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
517
518 if (np->rxopt.bits.rxinfo) {
519 struct in6_pktinfo src_info;
520
521 if (is_ipv6) {
522 src_info.ipi6_ifindex = IP6CB(skb)->iif;
523 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
524 } else {
525 src_info.ipi6_ifindex =
526 PKTINFO_SKB_CB(skb)->ipi_ifindex;
527 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
528 &src_info.ipi6_addr);
529 }
530
531 if (src_info.ipi6_ifindex >= 0)
532 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO,
533 sizeof(src_info), &src_info);
534 }
535 }
536
537 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
538 struct sk_buff *skb)
539 {
540 struct ipv6_pinfo *np = inet6_sk(sk);
541 struct inet6_skb_parm *opt = IP6CB(skb);
542 unsigned char *nh = skb_network_header(skb);
543
544 if (np->rxopt.bits.rxhlim) {
545 int hlim = ipv6_hdr(skb)->hop_limit;
546 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
547 }
548
549 if (np->rxopt.bits.rxtclass) {
550 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
551 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
552 }
553
554 if (np->rxopt.bits.rxflow) {
555 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
556 if (flowinfo)
557 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
558 }
559
560 /* HbH is allowed only once */
561 if (np->rxopt.bits.hopopts && opt->hop) {
562 u8 *ptr = nh + opt->hop;
563 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
564 }
565
566 if (opt->lastopt &&
567 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
568 /*
569 * Silly enough, but we need to reparse in order to
570 * report extension headers (except for HbH)
571 * in order.
572 *
573 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
574 * (and WILL NOT be) defined because
575 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
576 */
577 unsigned int off = sizeof(struct ipv6hdr);
578 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
579
580 while (off <= opt->lastopt) {
581 unsigned int len;
582 u8 *ptr = nh + off;
583
584 switch (nexthdr) {
585 case IPPROTO_DSTOPTS:
586 nexthdr = ptr[0];
587 len = (ptr[1] + 1) << 3;
588 if (np->rxopt.bits.dstopts)
589 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
590 break;
591 case IPPROTO_ROUTING:
592 nexthdr = ptr[0];
593 len = (ptr[1] + 1) << 3;
594 if (np->rxopt.bits.srcrt)
595 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
596 break;
597 case IPPROTO_AH:
598 nexthdr = ptr[0];
599 len = (ptr[1] + 2) << 2;
600 break;
601 default:
602 nexthdr = ptr[0];
603 len = (ptr[1] + 1) << 3;
604 break;
605 }
606
607 off += len;
608 }
609 }
610
611 /* socket options in old style */
612 if (np->rxopt.bits.rxoinfo) {
613 struct in6_pktinfo src_info;
614
615 src_info.ipi6_ifindex = opt->iif;
616 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
617 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
618 }
619 if (np->rxopt.bits.rxohlim) {
620 int hlim = ipv6_hdr(skb)->hop_limit;
621 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
622 }
623 if (np->rxopt.bits.ohopopts && opt->hop) {
624 u8 *ptr = nh + opt->hop;
625 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
626 }
627 if (np->rxopt.bits.odstopts && opt->dst0) {
628 u8 *ptr = nh + opt->dst0;
629 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
630 }
631 if (np->rxopt.bits.osrcrt && opt->srcrt) {
632 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
633 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
634 }
635 if (np->rxopt.bits.odstopts && opt->dst1) {
636 u8 *ptr = nh + opt->dst1;
637 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
638 }
639 if (np->rxopt.bits.rxorigdstaddr) {
640 struct sockaddr_in6 sin6;
641 __be16 *ports = (__be16 *) skb_transport_header(skb);
642
643 if (skb_transport_offset(skb) + 4 <= skb->len) {
644 /* All current transport protocols have the port numbers in the
645 * first four bytes of the transport header and this function is
646 * written with this assumption in mind.
647 */
648
649 sin6.sin6_family = AF_INET6;
650 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
651 sin6.sin6_port = ports[1];
652 sin6.sin6_flowinfo = 0;
653 sin6.sin6_scope_id =
654 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
655 opt->iif);
656
657 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
658 }
659 }
660 }
661
662 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
663 struct sk_buff *skb)
664 {
665 ip6_datagram_recv_common_ctl(sk, msg, skb);
666 ip6_datagram_recv_specific_ctl(sk, msg, skb);
667 }
668 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
669
670 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
671 struct msghdr *msg, struct flowi6 *fl6,
672 struct ipv6_txoptions *opt,
673 int *hlimit, int *tclass, int *dontfrag)
674 {
675 struct in6_pktinfo *src_info;
676 struct cmsghdr *cmsg;
677 struct ipv6_rt_hdr *rthdr;
678 struct ipv6_opt_hdr *hdr;
679 int len;
680 int err = 0;
681
682 for_each_cmsghdr(cmsg, msg) {
683 int addr_type;
684
685 if (!CMSG_OK(msg, cmsg)) {
686 err = -EINVAL;
687 goto exit_f;
688 }
689
690 if (cmsg->cmsg_level != SOL_IPV6)
691 continue;
692
693 switch (cmsg->cmsg_type) {
694 case IPV6_PKTINFO:
695 case IPV6_2292PKTINFO:
696 {
697 struct net_device *dev = NULL;
698
699 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
700 err = -EINVAL;
701 goto exit_f;
702 }
703
704 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
705
706 if (src_info->ipi6_ifindex) {
707 if (fl6->flowi6_oif &&
708 src_info->ipi6_ifindex != fl6->flowi6_oif)
709 return -EINVAL;
710 fl6->flowi6_oif = src_info->ipi6_ifindex;
711 }
712
713 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
714
715 rcu_read_lock();
716 if (fl6->flowi6_oif) {
717 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
718 if (!dev) {
719 rcu_read_unlock();
720 return -ENODEV;
721 }
722 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
723 rcu_read_unlock();
724 return -EINVAL;
725 }
726
727 if (addr_type != IPV6_ADDR_ANY) {
728 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
729 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
730 !ipv6_chk_addr(net, &src_info->ipi6_addr,
731 strict ? dev : NULL, 0) &&
732 !ipv6_chk_acast_addr_src(net, dev,
733 &src_info->ipi6_addr))
734 err = -EINVAL;
735 else
736 fl6->saddr = src_info->ipi6_addr;
737 }
738
739 rcu_read_unlock();
740
741 if (err)
742 goto exit_f;
743
744 break;
745 }
746
747 case IPV6_FLOWINFO:
748 if (cmsg->cmsg_len < CMSG_LEN(4)) {
749 err = -EINVAL;
750 goto exit_f;
751 }
752
753 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
754 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
755 err = -EINVAL;
756 goto exit_f;
757 }
758 }
759 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
760 break;
761
762 case IPV6_2292HOPOPTS:
763 case IPV6_HOPOPTS:
764 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
765 err = -EINVAL;
766 goto exit_f;
767 }
768
769 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
770 len = ((hdr->hdrlen + 1) << 3);
771 if (cmsg->cmsg_len < CMSG_LEN(len)) {
772 err = -EINVAL;
773 goto exit_f;
774 }
775 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
776 err = -EPERM;
777 goto exit_f;
778 }
779 opt->opt_nflen += len;
780 opt->hopopt = hdr;
781 break;
782
783 case IPV6_2292DSTOPTS:
784 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
785 err = -EINVAL;
786 goto exit_f;
787 }
788
789 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
790 len = ((hdr->hdrlen + 1) << 3);
791 if (cmsg->cmsg_len < CMSG_LEN(len)) {
792 err = -EINVAL;
793 goto exit_f;
794 }
795 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
796 err = -EPERM;
797 goto exit_f;
798 }
799 if (opt->dst1opt) {
800 err = -EINVAL;
801 goto exit_f;
802 }
803 opt->opt_flen += len;
804 opt->dst1opt = hdr;
805 break;
806
807 case IPV6_DSTOPTS:
808 case IPV6_RTHDRDSTOPTS:
809 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
810 err = -EINVAL;
811 goto exit_f;
812 }
813
814 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
815 len = ((hdr->hdrlen + 1) << 3);
816 if (cmsg->cmsg_len < CMSG_LEN(len)) {
817 err = -EINVAL;
818 goto exit_f;
819 }
820 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
821 err = -EPERM;
822 goto exit_f;
823 }
824 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
825 opt->opt_flen += len;
826 opt->dst1opt = hdr;
827 } else {
828 opt->opt_nflen += len;
829 opt->dst0opt = hdr;
830 }
831 break;
832
833 case IPV6_2292RTHDR:
834 case IPV6_RTHDR:
835 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
836 err = -EINVAL;
837 goto exit_f;
838 }
839
840 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
841
842 switch (rthdr->type) {
843 #if IS_ENABLED(CONFIG_IPV6_MIP6)
844 case IPV6_SRCRT_TYPE_2:
845 if (rthdr->hdrlen != 2 ||
846 rthdr->segments_left != 1) {
847 err = -EINVAL;
848 goto exit_f;
849 }
850 break;
851 #endif
852 default:
853 err = -EINVAL;
854 goto exit_f;
855 }
856
857 len = ((rthdr->hdrlen + 1) << 3);
858
859 if (cmsg->cmsg_len < CMSG_LEN(len)) {
860 err = -EINVAL;
861 goto exit_f;
862 }
863
864 /* segments left must also match */
865 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
866 err = -EINVAL;
867 goto exit_f;
868 }
869
870 opt->opt_nflen += len;
871 opt->srcrt = rthdr;
872
873 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
874 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
875
876 opt->opt_nflen += dsthdrlen;
877 opt->dst0opt = opt->dst1opt;
878 opt->dst1opt = NULL;
879 opt->opt_flen -= dsthdrlen;
880 }
881
882 break;
883
884 case IPV6_2292HOPLIMIT:
885 case IPV6_HOPLIMIT:
886 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
887 err = -EINVAL;
888 goto exit_f;
889 }
890
891 *hlimit = *(int *)CMSG_DATA(cmsg);
892 if (*hlimit < -1 || *hlimit > 0xff) {
893 err = -EINVAL;
894 goto exit_f;
895 }
896
897 break;
898
899 case IPV6_TCLASS:
900 {
901 int tc;
902
903 err = -EINVAL;
904 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
905 goto exit_f;
906
907 tc = *(int *)CMSG_DATA(cmsg);
908 if (tc < -1 || tc > 0xff)
909 goto exit_f;
910
911 err = 0;
912 *tclass = tc;
913
914 break;
915 }
916
917 case IPV6_DONTFRAG:
918 {
919 int df;
920
921 err = -EINVAL;
922 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
923 goto exit_f;
924
925 df = *(int *)CMSG_DATA(cmsg);
926 if (df < 0 || df > 1)
927 goto exit_f;
928
929 err = 0;
930 *dontfrag = df;
931
932 break;
933 }
934 default:
935 net_dbg_ratelimited("invalid cmsg type: %d\n",
936 cmsg->cmsg_type);
937 err = -EINVAL;
938 goto exit_f;
939 }
940 }
941
942 exit_f:
943 return err;
944 }
945 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
946
947 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
948 __u16 srcp, __u16 destp, int bucket)
949 {
950 const struct in6_addr *dest, *src;
951
952 dest = &sp->sk_v6_daddr;
953 src = &sp->sk_v6_rcv_saddr;
954 seq_printf(seq,
955 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
956 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
957 bucket,
958 src->s6_addr32[0], src->s6_addr32[1],
959 src->s6_addr32[2], src->s6_addr32[3], srcp,
960 dest->s6_addr32[0], dest->s6_addr32[1],
961 dest->s6_addr32[2], dest->s6_addr32[3], destp,
962 sp->sk_state,
963 sk_wmem_alloc_get(sp),
964 sk_rmem_alloc_get(sp),
965 0, 0L, 0,
966 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
967 0,
968 sock_i_ino(sp),
969 atomic_read(&sp->sk_refcnt), sp,
970 atomic_read(&sp->sk_drops));
971 }
Linux kernel - Deliverables
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