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ASoC: ssm4567: Remove duplicated else-if branch
[linux-2.6/btrfs-unstable.git] / net / ipv6 / datagram.c
blob2753319524f1acabb34a0520ea29ee361c1dfe9e
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 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 /*
329 * Handle MSG_ERRQUEUE
330 */
331 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
332 {
333 struct ipv6_pinfo *np = inet6_sk(sk);
334 struct sock_exterr_skb *serr;
335 struct sk_buff *skb, *skb2;
336 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
337 struct {
338 struct sock_extended_err ee;
339 struct sockaddr_in6 offender;
340 } errhdr;
341 int err;
342 int copied;
343
344 err = -EAGAIN;
345 skb = skb_dequeue(&sk->sk_error_queue);
346 if (skb == NULL)
347 goto out;
348
349 copied = skb->len;
350 if (copied > len) {
351 msg->msg_flags |= MSG_TRUNC;
352 copied = len;
353 }
354 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
355 if (err)
356 goto out_free_skb;
357
358 sock_recv_timestamp(msg, sk, skb);
359
360 serr = SKB_EXT_ERR(skb);
361
362 if (sin) {
363 const unsigned char *nh = skb_network_header(skb);
364 sin->sin6_family = AF_INET6;
365 sin->sin6_flowinfo = 0;
366 sin->sin6_port = serr->port;
367 if (skb->protocol == htons(ETH_P_IPV6)) {
368 const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset),
369 struct ipv6hdr, daddr);
370 sin->sin6_addr = ip6h->daddr;
371 if (np->sndflow)
372 sin->sin6_flowinfo = ip6_flowinfo(ip6h);
373 sin->sin6_scope_id =
374 ipv6_iface_scope_id(&sin->sin6_addr,
375 IP6CB(skb)->iif);
376 } else {
377 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
378 &sin->sin6_addr);
379 sin->sin6_scope_id = 0;
380 }
381 *addr_len = sizeof(*sin);
382 }
383
384 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
385 sin = &errhdr.offender;
386 sin->sin6_family = AF_UNSPEC;
387 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
388 sin->sin6_family = AF_INET6;
389 sin->sin6_flowinfo = 0;
390 sin->sin6_port = 0;
391 if (np->rxopt.all)
392 ip6_datagram_recv_common_ctl(sk, msg, skb);
393 if (skb->protocol == htons(ETH_P_IPV6)) {
394 sin->sin6_addr = ipv6_hdr(skb)->saddr;
395 if (np->rxopt.all)
396 ip6_datagram_recv_specific_ctl(sk, msg, skb);
397 sin->sin6_scope_id =
398 ipv6_iface_scope_id(&sin->sin6_addr,
399 IP6CB(skb)->iif);
400 } else {
401 struct inet_sock *inet = inet_sk(sk);
402
403 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
404 &sin->sin6_addr);
405 sin->sin6_scope_id = 0;
406 if (inet->cmsg_flags)
407 ip_cmsg_recv(msg, skb);
408 }
409 }
410
411 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
412
413 /* Now we could try to dump offended packet options */
414
415 msg->msg_flags |= MSG_ERRQUEUE;
416 err = copied;
417
418 /* Reset and regenerate socket error */
419 spin_lock_bh(&sk->sk_error_queue.lock);
420 sk->sk_err = 0;
421 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
422 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
423 spin_unlock_bh(&sk->sk_error_queue.lock);
424 sk->sk_error_report(sk);
425 } else {
426 spin_unlock_bh(&sk->sk_error_queue.lock);
427 }
428
429 out_free_skb:
430 kfree_skb(skb);
431 out:
432 return err;
433 }
434 EXPORT_SYMBOL_GPL(ipv6_recv_error);
435
436 /*
437 * Handle IPV6_RECVPATHMTU
438 */
439 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len,
440 int *addr_len)
441 {
442 struct ipv6_pinfo *np = inet6_sk(sk);
443 struct sk_buff *skb;
444 struct ip6_mtuinfo mtu_info;
445 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name);
446 int err;
447 int copied;
448
449 err = -EAGAIN;
450 skb = xchg(&np->rxpmtu, NULL);
451 if (skb == NULL)
452 goto out;
453
454 copied = skb->len;
455 if (copied > len) {
456 msg->msg_flags |= MSG_TRUNC;
457 copied = len;
458 }
459 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
460 if (err)
461 goto out_free_skb;
462
463 sock_recv_timestamp(msg, sk, skb);
464
465 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
466
467 if (sin) {
468 sin->sin6_family = AF_INET6;
469 sin->sin6_flowinfo = 0;
470 sin->sin6_port = 0;
471 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
472 sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr;
473 *addr_len = sizeof(*sin);
474 }
475
476 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
477
478 err = copied;
479
480 out_free_skb:
481 kfree_skb(skb);
482 out:
483 return err;
484 }
485
486
487 void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg,
488 struct sk_buff *skb)
489 {
490 struct ipv6_pinfo *np = inet6_sk(sk);
491 bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6);
492
493 if (np->rxopt.bits.rxinfo) {
494 struct in6_pktinfo src_info;
495
496 if (is_ipv6) {
497 src_info.ipi6_ifindex = IP6CB(skb)->iif;
498 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
499 } else {
500 src_info.ipi6_ifindex =
501 PKTINFO_SKB_CB(skb)->ipi_ifindex;
502 ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr,
503 &src_info.ipi6_addr);
504 }
505 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
506 }
507 }
508
509 void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
510 struct sk_buff *skb)
511 {
512 struct ipv6_pinfo *np = inet6_sk(sk);
513 struct inet6_skb_parm *opt = IP6CB(skb);
514 unsigned char *nh = skb_network_header(skb);
515
516 if (np->rxopt.bits.rxhlim) {
517 int hlim = ipv6_hdr(skb)->hop_limit;
518 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
519 }
520
521 if (np->rxopt.bits.rxtclass) {
522 int tclass = ipv6_get_dsfield(ipv6_hdr(skb));
523 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
524 }
525
526 if (np->rxopt.bits.rxflow) {
527 __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh);
528 if (flowinfo)
529 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
530 }
531
532 /* HbH is allowed only once */
533 if (np->rxopt.bits.hopopts && opt->hop) {
534 u8 *ptr = nh + opt->hop;
535 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
536 }
537
538 if (opt->lastopt &&
539 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
540 /*
541 * Silly enough, but we need to reparse in order to
542 * report extension headers (except for HbH)
543 * in order.
544 *
545 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
546 * (and WILL NOT be) defined because
547 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
548 */
549 unsigned int off = sizeof(struct ipv6hdr);
550 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
551
552 while (off <= opt->lastopt) {
553 unsigned int len;
554 u8 *ptr = nh + off;
555
556 switch (nexthdr) {
557 case IPPROTO_DSTOPTS:
558 nexthdr = ptr[0];
559 len = (ptr[1] + 1) << 3;
560 if (np->rxopt.bits.dstopts)
561 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
562 break;
563 case IPPROTO_ROUTING:
564 nexthdr = ptr[0];
565 len = (ptr[1] + 1) << 3;
566 if (np->rxopt.bits.srcrt)
567 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
568 break;
569 case IPPROTO_AH:
570 nexthdr = ptr[0];
571 len = (ptr[1] + 2) << 2;
572 break;
573 default:
574 nexthdr = ptr[0];
575 len = (ptr[1] + 1) << 3;
576 break;
577 }
578
579 off += len;
580 }
581 }
582
583 /* socket options in old style */
584 if (np->rxopt.bits.rxoinfo) {
585 struct in6_pktinfo src_info;
586
587 src_info.ipi6_ifindex = opt->iif;
588 src_info.ipi6_addr = ipv6_hdr(skb)->daddr;
589 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
590 }
591 if (np->rxopt.bits.rxohlim) {
592 int hlim = ipv6_hdr(skb)->hop_limit;
593 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
594 }
595 if (np->rxopt.bits.ohopopts && opt->hop) {
596 u8 *ptr = nh + opt->hop;
597 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
598 }
599 if (np->rxopt.bits.odstopts && opt->dst0) {
600 u8 *ptr = nh + opt->dst0;
601 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
602 }
603 if (np->rxopt.bits.osrcrt && opt->srcrt) {
604 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
605 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
606 }
607 if (np->rxopt.bits.odstopts && opt->dst1) {
608 u8 *ptr = nh + opt->dst1;
609 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
610 }
611 if (np->rxopt.bits.rxorigdstaddr) {
612 struct sockaddr_in6 sin6;
613 __be16 *ports = (__be16 *) skb_transport_header(skb);
614
615 if (skb_transport_offset(skb) + 4 <= skb->len) {
616 /* All current transport protocols have the port numbers in the
617 * first four bytes of the transport header and this function is
618 * written with this assumption in mind.
619 */
620
621 sin6.sin6_family = AF_INET6;
622 sin6.sin6_addr = ipv6_hdr(skb)->daddr;
623 sin6.sin6_port = ports[1];
624 sin6.sin6_flowinfo = 0;
625 sin6.sin6_scope_id =
626 ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr,
627 opt->iif);
628
629 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
630 }
631 }
632 }
633
634 void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
635 struct sk_buff *skb)
636 {
637 ip6_datagram_recv_common_ctl(sk, msg, skb);
638 ip6_datagram_recv_specific_ctl(sk, msg, skb);
639 }
640 EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl);
641
642 int ip6_datagram_send_ctl(struct net *net, struct sock *sk,
643 struct msghdr *msg, struct flowi6 *fl6,
644 struct ipv6_txoptions *opt,
645 int *hlimit, int *tclass, int *dontfrag)
646 {
647 struct in6_pktinfo *src_info;
648 struct cmsghdr *cmsg;
649 struct ipv6_rt_hdr *rthdr;
650 struct ipv6_opt_hdr *hdr;
651 int len;
652 int err = 0;
653
654 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
655 int addr_type;
656
657 if (!CMSG_OK(msg, cmsg)) {
658 err = -EINVAL;
659 goto exit_f;
660 }
661
662 if (cmsg->cmsg_level != SOL_IPV6)
663 continue;
664
665 switch (cmsg->cmsg_type) {
666 case IPV6_PKTINFO:
667 case IPV6_2292PKTINFO:
668 {
669 struct net_device *dev = NULL;
670
671 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
672 err = -EINVAL;
673 goto exit_f;
674 }
675
676 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
677
678 if (src_info->ipi6_ifindex) {
679 if (fl6->flowi6_oif &&
680 src_info->ipi6_ifindex != fl6->flowi6_oif)
681 return -EINVAL;
682 fl6->flowi6_oif = src_info->ipi6_ifindex;
683 }
684
685 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
686
687 rcu_read_lock();
688 if (fl6->flowi6_oif) {
689 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
690 if (!dev) {
691 rcu_read_unlock();
692 return -ENODEV;
693 }
694 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
695 rcu_read_unlock();
696 return -EINVAL;
697 }
698
699 if (addr_type != IPV6_ADDR_ANY) {
700 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
701 if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&
702 !ipv6_chk_addr(net, &src_info->ipi6_addr,
703 strict ? dev : NULL, 0) &&
704 !ipv6_chk_acast_addr_src(net, dev,
705 &src_info->ipi6_addr))
706 err = -EINVAL;
707 else
708 fl6->saddr = src_info->ipi6_addr;
709 }
710
711 rcu_read_unlock();
712
713 if (err)
714 goto exit_f;
715
716 break;
717 }
718
719 case IPV6_FLOWINFO:
720 if (cmsg->cmsg_len < CMSG_LEN(4)) {
721 err = -EINVAL;
722 goto exit_f;
723 }
724
725 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
726 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
727 err = -EINVAL;
728 goto exit_f;
729 }
730 }
731 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
732 break;
733
734 case IPV6_2292HOPOPTS:
735 case IPV6_HOPOPTS:
736 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
737 err = -EINVAL;
738 goto exit_f;
739 }
740
741 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
742 len = ((hdr->hdrlen + 1) << 3);
743 if (cmsg->cmsg_len < CMSG_LEN(len)) {
744 err = -EINVAL;
745 goto exit_f;
746 }
747 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
748 err = -EPERM;
749 goto exit_f;
750 }
751 opt->opt_nflen += len;
752 opt->hopopt = hdr;
753 break;
754
755 case IPV6_2292DSTOPTS:
756 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
757 err = -EINVAL;
758 goto exit_f;
759 }
760
761 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
762 len = ((hdr->hdrlen + 1) << 3);
763 if (cmsg->cmsg_len < CMSG_LEN(len)) {
764 err = -EINVAL;
765 goto exit_f;
766 }
767 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
768 err = -EPERM;
769 goto exit_f;
770 }
771 if (opt->dst1opt) {
772 err = -EINVAL;
773 goto exit_f;
774 }
775 opt->opt_flen += len;
776 opt->dst1opt = hdr;
777 break;
778
779 case IPV6_DSTOPTS:
780 case IPV6_RTHDRDSTOPTS:
781 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
782 err = -EINVAL;
783 goto exit_f;
784 }
785
786 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
787 len = ((hdr->hdrlen + 1) << 3);
788 if (cmsg->cmsg_len < CMSG_LEN(len)) {
789 err = -EINVAL;
790 goto exit_f;
791 }
792 if (!ns_capable(net->user_ns, CAP_NET_RAW)) {
793 err = -EPERM;
794 goto exit_f;
795 }
796 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
797 opt->opt_flen += len;
798 opt->dst1opt = hdr;
799 } else {
800 opt->opt_nflen += len;
801 opt->dst0opt = hdr;
802 }
803 break;
804
805 case IPV6_2292RTHDR:
806 case IPV6_RTHDR:
807 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
808 err = -EINVAL;
809 goto exit_f;
810 }
811
812 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
813
814 switch (rthdr->type) {
815 #if IS_ENABLED(CONFIG_IPV6_MIP6)
816 case IPV6_SRCRT_TYPE_2:
817 if (rthdr->hdrlen != 2 ||
818 rthdr->segments_left != 1) {
819 err = -EINVAL;
820 goto exit_f;
821 }
822 break;
823 #endif
824 default:
825 err = -EINVAL;
826 goto exit_f;
827 }
828
829 len = ((rthdr->hdrlen + 1) << 3);
830
831 if (cmsg->cmsg_len < CMSG_LEN(len)) {
832 err = -EINVAL;
833 goto exit_f;
834 }
835
836 /* segments left must also match */
837 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
838 err = -EINVAL;
839 goto exit_f;
840 }
841
842 opt->opt_nflen += len;
843 opt->srcrt = rthdr;
844
845 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
846 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
847
848 opt->opt_nflen += dsthdrlen;
849 opt->dst0opt = opt->dst1opt;
850 opt->dst1opt = NULL;
851 opt->opt_flen -= dsthdrlen;
852 }
853
854 break;
855
856 case IPV6_2292HOPLIMIT:
857 case IPV6_HOPLIMIT:
858 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
859 err = -EINVAL;
860 goto exit_f;
861 }
862
863 *hlimit = *(int *)CMSG_DATA(cmsg);
864 if (*hlimit < -1 || *hlimit > 0xff) {
865 err = -EINVAL;
866 goto exit_f;
867 }
868
869 break;
870
871 case IPV6_TCLASS:
872 {
873 int tc;
874
875 err = -EINVAL;
876 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
877 goto exit_f;
878
879 tc = *(int *)CMSG_DATA(cmsg);
880 if (tc < -1 || tc > 0xff)
881 goto exit_f;
882
883 err = 0;
884 *tclass = tc;
885
886 break;
887 }
888
889 case IPV6_DONTFRAG:
890 {
891 int df;
892
893 err = -EINVAL;
894 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
895 goto exit_f;
896
897 df = *(int *)CMSG_DATA(cmsg);
898 if (df < 0 || df > 1)
899 goto exit_f;
900
901 err = 0;
902 *dontfrag = df;
903
904 break;
905 }
906 default:
907 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
908 cmsg->cmsg_type);
909 err = -EINVAL;
910 goto exit_f;
911 }
912 }
913
914 exit_f:
915 return err;
916 }
917 EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl);
918
919 void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp,
920 __u16 srcp, __u16 destp, int bucket)
921 {
922 const struct in6_addr *dest, *src;
923
924 dest = &sp->sk_v6_daddr;
925 src = &sp->sk_v6_rcv_saddr;
926 seq_printf(seq,
927 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
928 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
929 bucket,
930 src->s6_addr32[0], src->s6_addr32[1],
931 src->s6_addr32[2], src->s6_addr32[3], srcp,
932 dest->s6_addr32[0], dest->s6_addr32[1],
933 dest->s6_addr32[2], dest->s6_addr32[3], destp,
934 sp->sk_state,
935 sk_wmem_alloc_get(sp),
936 sk_rmem_alloc_get(sp),
937 0, 0L, 0,
938 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
939 0,
940 sock_i_ino(sp),
941 atomic_read(&sp->sk_refcnt), sp,
942 atomic_read(&sp->sk_drops));
943 }
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