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[NET] NETNS: Omit sock->sk_net without CONFIG_NET_NS.
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / raw.c
1 /*
2 * RAW sockets for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Adapted from linux/net/ipv4/raw.c
9 *
10 * $Id: raw.c,v 1.51 2002/02/01 22:01:04 davem Exp $
11 *
12 * Fixes:
13 * Hideaki YOSHIFUJI : sin6_scope_id support
14 * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance)
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version
20 * 2 of the License, or (at your option) any later version.
21 */
22
23 #include <linux/errno.h>
24 #include <linux/types.h>
25 #include <linux/socket.h>
26 #include <linux/sockios.h>
27 #include <linux/net.h>
28 #include <linux/in6.h>
29 #include <linux/netdevice.h>
30 #include <linux/if_arp.h>
31 #include <linux/icmpv6.h>
32 #include <linux/netfilter.h>
33 #include <linux/netfilter_ipv6.h>
34 #include <linux/skbuff.h>
35 #include <asm/uaccess.h>
36 #include <asm/ioctls.h>
37
38 #include <net/net_namespace.h>
39 #include <net/ip.h>
40 #include <net/sock.h>
41 #include <net/snmp.h>
42
43 #include <net/ipv6.h>
44 #include <net/ndisc.h>
45 #include <net/protocol.h>
46 #include <net/ip6_route.h>
47 #include <net/ip6_checksum.h>
48 #include <net/addrconf.h>
49 #include <net/transp_v6.h>
50 #include <net/udp.h>
51 #include <net/inet_common.h>
52 #include <net/tcp_states.h>
53 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
54 #include <net/mip6.h>
55 #endif
56
57 #include <net/raw.h>
58 #include <net/rawv6.h>
59 #include <net/xfrm.h>
60
61 #include <linux/proc_fs.h>
62 #include <linux/seq_file.h>
63
64 static struct raw_hashinfo raw_v6_hashinfo = {
65 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
66 };
67
68 static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
69 unsigned short num, struct in6_addr *loc_addr,
70 struct in6_addr *rmt_addr, int dif)
71 {
72 struct hlist_node *node;
73 int is_multicast = ipv6_addr_is_multicast(loc_addr);
74
75 sk_for_each_from(sk, node)
76 if (inet_sk(sk)->num == num) {
77 struct ipv6_pinfo *np = inet6_sk(sk);
78
79 if (sock_net(sk) != net)
80 continue;
81
82 if (!ipv6_addr_any(&np->daddr) &&
83 !ipv6_addr_equal(&np->daddr, rmt_addr))
84 continue;
85
86 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
87 continue;
88
89 if (!ipv6_addr_any(&np->rcv_saddr)) {
90 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
91 goto found;
92 if (is_multicast &&
93 inet6_mc_check(sk, loc_addr, rmt_addr))
94 goto found;
95 continue;
96 }
97 goto found;
98 }
99 sk = NULL;
100 found:
101 return sk;
102 }
103
104 /*
105 * 0 - deliver
106 * 1 - block
107 */
108 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb)
109 {
110 struct icmp6hdr *icmph;
111 struct raw6_sock *rp = raw6_sk(sk);
112
113 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) {
114 __u32 *data = &rp->filter.data[0];
115 int bit_nr;
116
117 icmph = (struct icmp6hdr *) skb->data;
118 bit_nr = icmph->icmp6_type;
119
120 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0;
121 }
122 return 0;
123 }
124
125 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
126 static int (*mh_filter)(struct sock *sock, struct sk_buff *skb);
127
128 int rawv6_mh_filter_register(int (*filter)(struct sock *sock,
129 struct sk_buff *skb))
130 {
131 rcu_assign_pointer(mh_filter, filter);
132 return 0;
133 }
134 EXPORT_SYMBOL(rawv6_mh_filter_register);
135
136 int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock,
137 struct sk_buff *skb))
138 {
139 rcu_assign_pointer(mh_filter, NULL);
140 synchronize_rcu();
141 return 0;
142 }
143 EXPORT_SYMBOL(rawv6_mh_filter_unregister);
144
145 #endif
146
147 /*
148 * demultiplex raw sockets.
149 * (should consider queueing the skb in the sock receive_queue
150 * without calling rawv6.c)
151 *
152 * Caller owns SKB so we must make clones.
153 */
154 static int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
155 {
156 struct in6_addr *saddr;
157 struct in6_addr *daddr;
158 struct sock *sk;
159 int delivered = 0;
160 __u8 hash;
161 struct net *net;
162
163 saddr = &ipv6_hdr(skb)->saddr;
164 daddr = saddr + 1;
165
166 hash = nexthdr & (MAX_INET_PROTOS - 1);
167
168 read_lock(&raw_v6_hashinfo.lock);
169 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
170
171 /*
172 * The first socket found will be delivered after
173 * delivery to transport protocols.
174 */
175
176 if (sk == NULL)
177 goto out;
178
179 net = dev_net(skb->dev);
180 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
181
182 while (sk) {
183 int filtered;
184
185 delivered = 1;
186 switch (nexthdr) {
187 case IPPROTO_ICMPV6:
188 filtered = icmpv6_filter(sk, skb);
189 break;
190
191 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
192 case IPPROTO_MH:
193 {
194 /* XXX: To validate MH only once for each packet,
195 * this is placed here. It should be after checking
196 * xfrm policy, however it doesn't. The checking xfrm
197 * policy is placed in rawv6_rcv() because it is
198 * required for each socket.
199 */
200 int (*filter)(struct sock *sock, struct sk_buff *skb);
201
202 filter = rcu_dereference(mh_filter);
203 filtered = filter ? filter(sk, skb) : 0;
204 break;
205 }
206 #endif
207 default:
208 filtered = 0;
209 break;
210 }
211
212 if (filtered < 0)
213 break;
214 if (filtered == 0) {
215 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
216
217 /* Not releasing hash table! */
218 if (clone) {
219 nf_reset(clone);
220 rawv6_rcv(sk, clone);
221 }
222 }
223 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
224 IP6CB(skb)->iif);
225 }
226 out:
227 read_unlock(&raw_v6_hashinfo.lock);
228 return delivered;
229 }
230
231 int raw6_local_deliver(struct sk_buff *skb, int nexthdr)
232 {
233 struct sock *raw_sk;
234
235 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (MAX_INET_PROTOS - 1)]);
236 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
237 raw_sk = NULL;
238
239 return raw_sk != NULL;
240 }
241
242 /* This cleans up af_inet6 a bit. -DaveM */
243 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
244 {
245 struct inet_sock *inet = inet_sk(sk);
246 struct ipv6_pinfo *np = inet6_sk(sk);
247 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
248 __be32 v4addr = 0;
249 int addr_type;
250 int err;
251
252 if (addr_len < SIN6_LEN_RFC2133)
253 return -EINVAL;
254 addr_type = ipv6_addr_type(&addr->sin6_addr);
255
256 /* Raw sockets are IPv6 only */
257 if (addr_type == IPV6_ADDR_MAPPED)
258 return(-EADDRNOTAVAIL);
259
260 lock_sock(sk);
261
262 err = -EINVAL;
263 if (sk->sk_state != TCP_CLOSE)
264 goto out;
265
266 /* Check if the address belongs to the host. */
267 if (addr_type != IPV6_ADDR_ANY) {
268 struct net_device *dev = NULL;
269
270 if (addr_type & IPV6_ADDR_LINKLOCAL) {
271 if (addr_len >= sizeof(struct sockaddr_in6) &&
272 addr->sin6_scope_id) {
273 /* Override any existing binding, if another
274 * one is supplied by user.
275 */
276 sk->sk_bound_dev_if = addr->sin6_scope_id;
277 }
278
279 /* Binding to link-local address requires an interface */
280 if (!sk->sk_bound_dev_if)
281 goto out;
282
283 dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
284 if (!dev) {
285 err = -ENODEV;
286 goto out;
287 }
288 }
289
290 /* ipv4 addr of the socket is invalid. Only the
291 * unspecified and mapped address have a v4 equivalent.
292 */
293 v4addr = LOOPBACK4_IPV6;
294 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
295 err = -EADDRNOTAVAIL;
296 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
297 dev, 0)) {
298 if (dev)
299 dev_put(dev);
300 goto out;
301 }
302 }
303 if (dev)
304 dev_put(dev);
305 }
306
307 inet->rcv_saddr = inet->saddr = v4addr;
308 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
309 if (!(addr_type & IPV6_ADDR_MULTICAST))
310 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
311 err = 0;
312 out:
313 release_sock(sk);
314 return err;
315 }
316
317 static void rawv6_err(struct sock *sk, struct sk_buff *skb,
318 struct inet6_skb_parm *opt,
319 int type, int code, int offset, __be32 info)
320 {
321 struct inet_sock *inet = inet_sk(sk);
322 struct ipv6_pinfo *np = inet6_sk(sk);
323 int err;
324 int harderr;
325
326 /* Report error on raw socket, if:
327 1. User requested recverr.
328 2. Socket is connected (otherwise the error indication
329 is useless without recverr and error is hard.
330 */
331 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
332 return;
333
334 harderr = icmpv6_err_convert(type, code, &err);
335 if (type == ICMPV6_PKT_TOOBIG)
336 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
337
338 if (np->recverr) {
339 u8 *payload = skb->data;
340 if (!inet->hdrincl)
341 payload += offset;
342 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
343 }
344
345 if (np->recverr || harderr) {
346 sk->sk_err = err;
347 sk->sk_error_report(sk);
348 }
349 }
350
351 void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
352 int type, int code, int inner_offset, __be32 info)
353 {
354 struct sock *sk;
355 int hash;
356 struct in6_addr *saddr, *daddr;
357 struct net *net;
358
359 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
360
361 read_lock(&raw_v6_hashinfo.lock);
362 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
363 if (sk != NULL) {
364 saddr = &ipv6_hdr(skb)->saddr;
365 daddr = &ipv6_hdr(skb)->daddr;
366 net = dev_net(skb->dev);
367
368 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
369 IP6CB(skb)->iif))) {
370 rawv6_err(sk, skb, NULL, type, code,
371 inner_offset, info);
372 sk = sk_next(sk);
373 }
374 }
375 read_unlock(&raw_v6_hashinfo.lock);
376 }
377
378 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
379 {
380 if ((raw6_sk(sk)->checksum || sk->sk_filter) &&
381 skb_checksum_complete(skb)) {
382 atomic_inc(&sk->sk_drops);
383 kfree_skb(skb);
384 return 0;
385 }
386
387 /* Charge it to the socket. */
388 if (sock_queue_rcv_skb(sk,skb)<0) {
389 atomic_inc(&sk->sk_drops);
390 kfree_skb(skb);
391 return 0;
392 }
393
394 return 0;
395 }
396
397 /*
398 * This is next to useless...
399 * if we demultiplex in network layer we don't need the extra call
400 * just to queue the skb...
401 * maybe we could have the network decide upon a hint if it
402 * should call raw_rcv for demultiplexing
403 */
404 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
405 {
406 struct inet_sock *inet = inet_sk(sk);
407 struct raw6_sock *rp = raw6_sk(sk);
408
409 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
410 atomic_inc(&sk->sk_drops);
411 kfree_skb(skb);
412 return NET_RX_DROP;
413 }
414
415 if (!rp->checksum)
416 skb->ip_summed = CHECKSUM_UNNECESSARY;
417
418 if (skb->ip_summed == CHECKSUM_COMPLETE) {
419 skb_postpull_rcsum(skb, skb_network_header(skb),
420 skb_network_header_len(skb));
421 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
422 &ipv6_hdr(skb)->daddr,
423 skb->len, inet->num, skb->csum))
424 skb->ip_summed = CHECKSUM_UNNECESSARY;
425 }
426 if (!skb_csum_unnecessary(skb))
427 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
428 &ipv6_hdr(skb)->daddr,
429 skb->len,
430 inet->num, 0));
431
432 if (inet->hdrincl) {
433 if (skb_checksum_complete(skb)) {
434 atomic_inc(&sk->sk_drops);
435 kfree_skb(skb);
436 return 0;
437 }
438 }
439
440 rawv6_rcv_skb(sk, skb);
441 return 0;
442 }
443
444
445 /*
446 * This should be easy, if there is something there
447 * we return it, otherwise we block.
448 */
449
450 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
451 struct msghdr *msg, size_t len,
452 int noblock, int flags, int *addr_len)
453 {
454 struct ipv6_pinfo *np = inet6_sk(sk);
455 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
456 struct sk_buff *skb;
457 size_t copied;
458 int err;
459
460 if (flags & MSG_OOB)
461 return -EOPNOTSUPP;
462
463 if (addr_len)
464 *addr_len=sizeof(*sin6);
465
466 if (flags & MSG_ERRQUEUE)
467 return ipv6_recv_error(sk, msg, len);
468
469 skb = skb_recv_datagram(sk, flags, noblock, &err);
470 if (!skb)
471 goto out;
472
473 copied = skb->len;
474 if (copied > len) {
475 copied = len;
476 msg->msg_flags |= MSG_TRUNC;
477 }
478
479 if (skb_csum_unnecessary(skb)) {
480 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
481 } else if (msg->msg_flags&MSG_TRUNC) {
482 if (__skb_checksum_complete(skb))
483 goto csum_copy_err;
484 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
485 } else {
486 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
487 if (err == -EINVAL)
488 goto csum_copy_err;
489 }
490 if (err)
491 goto out_free;
492
493 /* Copy the address. */
494 if (sin6) {
495 sin6->sin6_family = AF_INET6;
496 sin6->sin6_port = 0;
497 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
498 sin6->sin6_flowinfo = 0;
499 sin6->sin6_scope_id = 0;
500 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
501 sin6->sin6_scope_id = IP6CB(skb)->iif;
502 }
503
504 sock_recv_timestamp(msg, sk, skb);
505
506 if (np->rxopt.all)
507 datagram_recv_ctl(sk, msg, skb);
508
509 err = copied;
510 if (flags & MSG_TRUNC)
511 err = skb->len;
512
513 out_free:
514 skb_free_datagram(sk, skb);
515 out:
516 return err;
517
518 csum_copy_err:
519 skb_kill_datagram(sk, skb, flags);
520
521 /* Error for blocking case is chosen to masquerade
522 as some normal condition.
523 */
524 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
525 atomic_inc(&sk->sk_drops);
526 goto out;
527 }
528
529 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
530 struct raw6_sock *rp)
531 {
532 struct sk_buff *skb;
533 int err = 0;
534 int offset;
535 int len;
536 int total_len;
537 __wsum tmp_csum;
538 __sum16 csum;
539
540 if (!rp->checksum)
541 goto send;
542
543 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
544 goto out;
545
546 offset = rp->offset;
547 total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) -
548 skb->data);
549 if (offset >= total_len - 1) {
550 err = -EINVAL;
551 ip6_flush_pending_frames(sk);
552 goto out;
553 }
554
555 /* should be check HW csum miyazawa */
556 if (skb_queue_len(&sk->sk_write_queue) == 1) {
557 /*
558 * Only one fragment on the socket.
559 */
560 tmp_csum = skb->csum;
561 } else {
562 struct sk_buff *csum_skb = NULL;
563 tmp_csum = 0;
564
565 skb_queue_walk(&sk->sk_write_queue, skb) {
566 tmp_csum = csum_add(tmp_csum, skb->csum);
567
568 if (csum_skb)
569 continue;
570
571 len = skb->len - skb_transport_offset(skb);
572 if (offset >= len) {
573 offset -= len;
574 continue;
575 }
576
577 csum_skb = skb;
578 }
579
580 skb = csum_skb;
581 }
582
583 offset += skb_transport_offset(skb);
584 if (skb_copy_bits(skb, offset, &csum, 2))
585 BUG();
586
587 /* in case cksum was not initialized */
588 if (unlikely(csum))
589 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
590
591 csum = csum_ipv6_magic(&fl->fl6_src,
592 &fl->fl6_dst,
593 total_len, fl->proto, tmp_csum);
594
595 if (csum == 0 && fl->proto == IPPROTO_UDP)
596 csum = CSUM_MANGLED_0;
597
598 if (skb_store_bits(skb, offset, &csum, 2))
599 BUG();
600
601 send:
602 err = ip6_push_pending_frames(sk);
603 out:
604 return err;
605 }
606
607 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
608 struct flowi *fl, struct rt6_info *rt,
609 unsigned int flags)
610 {
611 struct ipv6_pinfo *np = inet6_sk(sk);
612 struct ipv6hdr *iph;
613 struct sk_buff *skb;
614 unsigned int hh_len;
615 int err;
616
617 if (length > rt->u.dst.dev->mtu) {
618 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu);
619 return -EMSGSIZE;
620 }
621 if (flags&MSG_PROBE)
622 goto out;
623
624 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
625
626 skb = sock_alloc_send_skb(sk, length+hh_len+15,
627 flags&MSG_DONTWAIT, &err);
628 if (skb == NULL)
629 goto error;
630 skb_reserve(skb, hh_len);
631
632 skb->priority = sk->sk_priority;
633 skb->mark = sk->sk_mark;
634 skb->dst = dst_clone(&rt->u.dst);
635
636 skb_put(skb, length);
637 skb_reset_network_header(skb);
638 iph = ipv6_hdr(skb);
639
640 skb->ip_summed = CHECKSUM_NONE;
641
642 skb->transport_header = skb->network_header;
643 err = memcpy_fromiovecend((void *)iph, from, 0, length);
644 if (err)
645 goto error_fault;
646
647 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS);
648 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
649 dst_output);
650 if (err > 0)
651 err = np->recverr ? net_xmit_errno(err) : 0;
652 if (err)
653 goto error;
654 out:
655 return 0;
656
657 error_fault:
658 err = -EFAULT;
659 kfree_skb(skb);
660 error:
661 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
662 return err;
663 }
664
665 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
666 {
667 struct iovec *iov;
668 u8 __user *type = NULL;
669 u8 __user *code = NULL;
670 u8 len = 0;
671 int probed = 0;
672 int i;
673
674 if (!msg->msg_iov)
675 return 0;
676
677 for (i = 0; i < msg->msg_iovlen; i++) {
678 iov = &msg->msg_iov[i];
679 if (!iov)
680 continue;
681
682 switch (fl->proto) {
683 case IPPROTO_ICMPV6:
684 /* check if one-byte field is readable or not. */
685 if (iov->iov_base && iov->iov_len < 1)
686 break;
687
688 if (!type) {
689 type = iov->iov_base;
690 /* check if code field is readable or not. */
691 if (iov->iov_len > 1)
692 code = type + 1;
693 } else if (!code)
694 code = iov->iov_base;
695
696 if (type && code) {
697 if (get_user(fl->fl_icmp_type, type) ||
698 get_user(fl->fl_icmp_code, code))
699 return -EFAULT;
700 probed = 1;
701 }
702 break;
703 case IPPROTO_MH:
704 if (iov->iov_base && iov->iov_len < 1)
705 break;
706 /* check if type field is readable or not. */
707 if (iov->iov_len > 2 - len) {
708 u8 __user *p = iov->iov_base;
709 if (get_user(fl->fl_mh_type, &p[2 - len]))
710 return -EFAULT;
711 probed = 1;
712 } else
713 len += iov->iov_len;
714
715 break;
716 default:
717 probed = 1;
718 break;
719 }
720 if (probed)
721 break;
722 }
723 return 0;
724 }
725
726 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
727 struct msghdr *msg, size_t len)
728 {
729 struct ipv6_txoptions opt_space;
730 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
731 struct in6_addr *daddr, *final_p = NULL, final;
732 struct inet_sock *inet = inet_sk(sk);
733 struct ipv6_pinfo *np = inet6_sk(sk);
734 struct raw6_sock *rp = raw6_sk(sk);
735 struct ipv6_txoptions *opt = NULL;
736 struct ip6_flowlabel *flowlabel = NULL;
737 struct dst_entry *dst = NULL;
738 struct flowi fl;
739 int addr_len = msg->msg_namelen;
740 int hlimit = -1;
741 int tclass = -1;
742 u16 proto;
743 int err;
744
745 /* Rough check on arithmetic overflow,
746 better check is made in ip6_append_data().
747 */
748 if (len > INT_MAX)
749 return -EMSGSIZE;
750
751 /* Mirror BSD error message compatibility */
752 if (msg->msg_flags & MSG_OOB)
753 return -EOPNOTSUPP;
754
755 /*
756 * Get and verify the address.
757 */
758 memset(&fl, 0, sizeof(fl));
759
760 fl.mark = sk->sk_mark;
761
762 if (sin6) {
763 if (addr_len < SIN6_LEN_RFC2133)
764 return -EINVAL;
765
766 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
767 return(-EAFNOSUPPORT);
768
769 /* port is the proto value [0..255] carried in nexthdr */
770 proto = ntohs(sin6->sin6_port);
771
772 if (!proto)
773 proto = inet->num;
774 else if (proto != inet->num)
775 return(-EINVAL);
776
777 if (proto > 255)
778 return(-EINVAL);
779
780 daddr = &sin6->sin6_addr;
781 if (np->sndflow) {
782 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
783 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
784 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
785 if (flowlabel == NULL)
786 return -EINVAL;
787 daddr = &flowlabel->dst;
788 }
789 }
790
791 /*
792 * Otherwise it will be difficult to maintain
793 * sk->sk_dst_cache.
794 */
795 if (sk->sk_state == TCP_ESTABLISHED &&
796 ipv6_addr_equal(daddr, &np->daddr))
797 daddr = &np->daddr;
798
799 if (addr_len >= sizeof(struct sockaddr_in6) &&
800 sin6->sin6_scope_id &&
801 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
802 fl.oif = sin6->sin6_scope_id;
803 } else {
804 if (sk->sk_state != TCP_ESTABLISHED)
805 return -EDESTADDRREQ;
806
807 proto = inet->num;
808 daddr = &np->daddr;
809 fl.fl6_flowlabel = np->flow_label;
810 }
811
812 if (ipv6_addr_any(daddr)) {
813 /*
814 * unspecified destination address
815 * treated as error... is this correct ?
816 */
817 fl6_sock_release(flowlabel);
818 return(-EINVAL);
819 }
820
821 if (fl.oif == 0)
822 fl.oif = sk->sk_bound_dev_if;
823
824 if (msg->msg_controllen) {
825 opt = &opt_space;
826 memset(opt, 0, sizeof(struct ipv6_txoptions));
827 opt->tot_len = sizeof(struct ipv6_txoptions);
828
829 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
830 if (err < 0) {
831 fl6_sock_release(flowlabel);
832 return err;
833 }
834 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
835 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
836 if (flowlabel == NULL)
837 return -EINVAL;
838 }
839 if (!(opt->opt_nflen|opt->opt_flen))
840 opt = NULL;
841 }
842 if (opt == NULL)
843 opt = np->opt;
844 if (flowlabel)
845 opt = fl6_merge_options(&opt_space, flowlabel, opt);
846 opt = ipv6_fixup_options(&opt_space, opt);
847
848 fl.proto = proto;
849 err = rawv6_probe_proto_opt(&fl, msg);
850 if (err)
851 goto out;
852
853 ipv6_addr_copy(&fl.fl6_dst, daddr);
854 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
855 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
856
857 /* merge ip6_build_xmit from ip6_output */
858 if (opt && opt->srcrt) {
859 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
860 ipv6_addr_copy(&final, &fl.fl6_dst);
861 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
862 final_p = &final;
863 }
864
865 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
866 fl.oif = np->mcast_oif;
867 security_sk_classify_flow(sk, &fl);
868
869 err = ip6_dst_lookup(sk, &dst, &fl);
870 if (err)
871 goto out;
872 if (final_p)
873 ipv6_addr_copy(&fl.fl6_dst, final_p);
874
875 if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) {
876 if (err == -EREMOTE)
877 err = ip6_dst_blackhole(sk, &dst, &fl);
878 if (err < 0)
879 goto out;
880 }
881
882 if (hlimit < 0) {
883 if (ipv6_addr_is_multicast(&fl.fl6_dst))
884 hlimit = np->mcast_hops;
885 else
886 hlimit = np->hop_limit;
887 if (hlimit < 0)
888 hlimit = ip6_dst_hoplimit(dst);
889 }
890
891 if (tclass < 0) {
892 tclass = np->tclass;
893 if (tclass < 0)
894 tclass = 0;
895 }
896
897 if (msg->msg_flags&MSG_CONFIRM)
898 goto do_confirm;
899
900 back_from_confirm:
901 if (inet->hdrincl) {
902 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags);
903 } else {
904 lock_sock(sk);
905 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
906 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst,
907 msg->msg_flags);
908
909 if (err)
910 ip6_flush_pending_frames(sk);
911 else if (!(msg->msg_flags & MSG_MORE))
912 err = rawv6_push_pending_frames(sk, &fl, rp);
913 release_sock(sk);
914 }
915 done:
916 dst_release(dst);
917 out:
918 fl6_sock_release(flowlabel);
919 return err<0?err:len;
920 do_confirm:
921 dst_confirm(dst);
922 if (!(msg->msg_flags & MSG_PROBE) || len)
923 goto back_from_confirm;
924 err = 0;
925 goto done;
926 }
927
928 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
929 char __user *optval, int optlen)
930 {
931 switch (optname) {
932 case ICMPV6_FILTER:
933 if (optlen > sizeof(struct icmp6_filter))
934 optlen = sizeof(struct icmp6_filter);
935 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
936 return -EFAULT;
937 return 0;
938 default:
939 return -ENOPROTOOPT;
940 }
941
942 return 0;
943 }
944
945 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
946 char __user *optval, int __user *optlen)
947 {
948 int len;
949
950 switch (optname) {
951 case ICMPV6_FILTER:
952 if (get_user(len, optlen))
953 return -EFAULT;
954 if (len < 0)
955 return -EINVAL;
956 if (len > sizeof(struct icmp6_filter))
957 len = sizeof(struct icmp6_filter);
958 if (put_user(len, optlen))
959 return -EFAULT;
960 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
961 return -EFAULT;
962 return 0;
963 default:
964 return -ENOPROTOOPT;
965 }
966
967 return 0;
968 }
969
970
971 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
972 char __user *optval, int optlen)
973 {
974 struct raw6_sock *rp = raw6_sk(sk);
975 int val;
976
977 if (get_user(val, (int __user *)optval))
978 return -EFAULT;
979
980 switch (optname) {
981 case IPV6_CHECKSUM:
982 /* You may get strange result with a positive odd offset;
983 RFC2292bis agrees with me. */
984 if (val > 0 && (val&1))
985 return(-EINVAL);
986 if (val < 0) {
987 rp->checksum = 0;
988 } else {
989 rp->checksum = 1;
990 rp->offset = val;
991 }
992
993 return 0;
994 break;
995
996 default:
997 return(-ENOPROTOOPT);
998 }
999 }
1000
1001 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1002 char __user *optval, int optlen)
1003 {
1004 switch(level) {
1005 case SOL_RAW:
1006 break;
1007
1008 case SOL_ICMPV6:
1009 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1010 return -EOPNOTSUPP;
1011 return rawv6_seticmpfilter(sk, level, optname, optval,
1012 optlen);
1013 case SOL_IPV6:
1014 if (optname == IPV6_CHECKSUM)
1015 break;
1016 default:
1017 return ipv6_setsockopt(sk, level, optname, optval,
1018 optlen);
1019 }
1020
1021 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1022 }
1023
1024 #ifdef CONFIG_COMPAT
1025 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1026 char __user *optval, int optlen)
1027 {
1028 switch (level) {
1029 case SOL_RAW:
1030 break;
1031 case SOL_ICMPV6:
1032 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1033 return -EOPNOTSUPP;
1034 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1035 case SOL_IPV6:
1036 if (optname == IPV6_CHECKSUM)
1037 break;
1038 default:
1039 return compat_ipv6_setsockopt(sk, level, optname,
1040 optval, optlen);
1041 }
1042 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1043 }
1044 #endif
1045
1046 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1047 char __user *optval, int __user *optlen)
1048 {
1049 struct raw6_sock *rp = raw6_sk(sk);
1050 int val, len;
1051
1052 if (get_user(len,optlen))
1053 return -EFAULT;
1054
1055 switch (optname) {
1056 case IPV6_CHECKSUM:
1057 if (rp->checksum == 0)
1058 val = -1;
1059 else
1060 val = rp->offset;
1061 break;
1062
1063 default:
1064 return -ENOPROTOOPT;
1065 }
1066
1067 len = min_t(unsigned int, sizeof(int), len);
1068
1069 if (put_user(len, optlen))
1070 return -EFAULT;
1071 if (copy_to_user(optval,&val,len))
1072 return -EFAULT;
1073 return 0;
1074 }
1075
1076 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1077 char __user *optval, int __user *optlen)
1078 {
1079 switch(level) {
1080 case SOL_RAW:
1081 break;
1082
1083 case SOL_ICMPV6:
1084 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1085 return -EOPNOTSUPP;
1086 return rawv6_geticmpfilter(sk, level, optname, optval,
1087 optlen);
1088 case SOL_IPV6:
1089 if (optname == IPV6_CHECKSUM)
1090 break;
1091 default:
1092 return ipv6_getsockopt(sk, level, optname, optval,
1093 optlen);
1094 }
1095
1096 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1097 }
1098
1099 #ifdef CONFIG_COMPAT
1100 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1101 char __user *optval, int __user *optlen)
1102 {
1103 switch (level) {
1104 case SOL_RAW:
1105 break;
1106 case SOL_ICMPV6:
1107 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1108 return -EOPNOTSUPP;
1109 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1110 case SOL_IPV6:
1111 if (optname == IPV6_CHECKSUM)
1112 break;
1113 default:
1114 return compat_ipv6_getsockopt(sk, level, optname,
1115 optval, optlen);
1116 }
1117 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1118 }
1119 #endif
1120
1121 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1122 {
1123 switch(cmd) {
1124 case SIOCOUTQ:
1125 {
1126 int amount = atomic_read(&sk->sk_wmem_alloc);
1127 return put_user(amount, (int __user *)arg);
1128 }
1129 case SIOCINQ:
1130 {
1131 struct sk_buff *skb;
1132 int amount = 0;
1133
1134 spin_lock_bh(&sk->sk_receive_queue.lock);
1135 skb = skb_peek(&sk->sk_receive_queue);
1136 if (skb != NULL)
1137 amount = skb->tail - skb->transport_header;
1138 spin_unlock_bh(&sk->sk_receive_queue.lock);
1139 return put_user(amount, (int __user *)arg);
1140 }
1141
1142 default:
1143 return -ENOIOCTLCMD;
1144 }
1145 }
1146
1147 static void rawv6_close(struct sock *sk, long timeout)
1148 {
1149 if (inet_sk(sk)->num == IPPROTO_RAW)
1150 ip6_ra_control(sk, -1, NULL);
1151
1152 sk_common_release(sk);
1153 }
1154
1155 static int rawv6_init_sk(struct sock *sk)
1156 {
1157 struct raw6_sock *rp = raw6_sk(sk);
1158
1159 switch (inet_sk(sk)->num) {
1160 case IPPROTO_ICMPV6:
1161 rp->checksum = 1;
1162 rp->offset = 2;
1163 break;
1164 case IPPROTO_MH:
1165 rp->checksum = 1;
1166 rp->offset = 4;
1167 break;
1168 default:
1169 break;
1170 }
1171 return(0);
1172 }
1173
1174 DEFINE_PROTO_INUSE(rawv6)
1175
1176 struct proto rawv6_prot = {
1177 .name = "RAWv6",
1178 .owner = THIS_MODULE,
1179 .close = rawv6_close,
1180 .connect = ip6_datagram_connect,
1181 .disconnect = udp_disconnect,
1182 .ioctl = rawv6_ioctl,
1183 .init = rawv6_init_sk,
1184 .destroy = inet6_destroy_sock,
1185 .setsockopt = rawv6_setsockopt,
1186 .getsockopt = rawv6_getsockopt,
1187 .sendmsg = rawv6_sendmsg,
1188 .recvmsg = rawv6_recvmsg,
1189 .bind = rawv6_bind,
1190 .backlog_rcv = rawv6_rcv_skb,
1191 .hash = raw_hash_sk,
1192 .unhash = raw_unhash_sk,
1193 .obj_size = sizeof(struct raw6_sock),
1194 .h.raw_hash = &raw_v6_hashinfo,
1195 #ifdef CONFIG_COMPAT
1196 .compat_setsockopt = compat_rawv6_setsockopt,
1197 .compat_getsockopt = compat_rawv6_getsockopt,
1198 #endif
1199 REF_PROTO_INUSE(rawv6)
1200 };
1201
1202 #ifdef CONFIG_PROC_FS
1203 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1204 {
1205 struct ipv6_pinfo *np = inet6_sk(sp);
1206 struct in6_addr *dest, *src;
1207 __u16 destp, srcp;
1208
1209 dest = &np->daddr;
1210 src = &np->rcv_saddr;
1211 destp = 0;
1212 srcp = inet_sk(sp)->num;
1213 seq_printf(seq,
1214 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1215 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1216 i,
1217 src->s6_addr32[0], src->s6_addr32[1],
1218 src->s6_addr32[2], src->s6_addr32[3], srcp,
1219 dest->s6_addr32[0], dest->s6_addr32[1],
1220 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1221 sp->sk_state,
1222 atomic_read(&sp->sk_wmem_alloc),
1223 atomic_read(&sp->sk_rmem_alloc),
1224 0, 0L, 0,
1225 sock_i_uid(sp), 0,
1226 sock_i_ino(sp),
1227 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1228 }
1229
1230 static int raw6_seq_show(struct seq_file *seq, void *v)
1231 {
1232 if (v == SEQ_START_TOKEN)
1233 seq_printf(seq,
1234 " sl "
1235 "local_address "
1236 "remote_address "
1237 "st tx_queue rx_queue tr tm->when retrnsmt"
1238 " uid timeout inode drops\n");
1239 else
1240 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1241 return 0;
1242 }
1243
1244 static const struct seq_operations raw6_seq_ops = {
1245 .start = raw_seq_start,
1246 .next = raw_seq_next,
1247 .stop = raw_seq_stop,
1248 .show = raw6_seq_show,
1249 };
1250
1251 static int raw6_seq_open(struct inode *inode, struct file *file)
1252 {
1253 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1254 }
1255
1256 static const struct file_operations raw6_seq_fops = {
1257 .owner = THIS_MODULE,
1258 .open = raw6_seq_open,
1259 .read = seq_read,
1260 .llseek = seq_lseek,
1261 .release = seq_release_net,
1262 };
1263
1264 static int raw6_init_net(struct net *net)
1265 {
1266 if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops))
1267 return -ENOMEM;
1268
1269 return 0;
1270 }
1271
1272 static void raw6_exit_net(struct net *net)
1273 {
1274 proc_net_remove(net, "raw6");
1275 }
1276
1277 static struct pernet_operations raw6_net_ops = {
1278 .init = raw6_init_net,
1279 .exit = raw6_exit_net,
1280 };
1281
1282 int __init raw6_proc_init(void)
1283 {
1284 return register_pernet_subsys(&raw6_net_ops);
1285 }
1286
1287 void raw6_proc_exit(void)
1288 {
1289 unregister_pernet_subsys(&raw6_net_ops);
1290 }
1291 #endif /* CONFIG_PROC_FS */
1292
1293 /* Same as inet6_dgram_ops, sans udp_poll. */
1294 static const struct proto_ops inet6_sockraw_ops = {
1295 .family = PF_INET6,
1296 .owner = THIS_MODULE,
1297 .release = inet6_release,
1298 .bind = inet6_bind,
1299 .connect = inet_dgram_connect, /* ok */
1300 .socketpair = sock_no_socketpair, /* a do nothing */
1301 .accept = sock_no_accept, /* a do nothing */
1302 .getname = inet6_getname,
1303 .poll = datagram_poll, /* ok */
1304 .ioctl = inet6_ioctl, /* must change */
1305 .listen = sock_no_listen, /* ok */
1306 .shutdown = inet_shutdown, /* ok */
1307 .setsockopt = sock_common_setsockopt, /* ok */
1308 .getsockopt = sock_common_getsockopt, /* ok */
1309 .sendmsg = inet_sendmsg, /* ok */
1310 .recvmsg = sock_common_recvmsg, /* ok */
1311 .mmap = sock_no_mmap,
1312 .sendpage = sock_no_sendpage,
1313 #ifdef CONFIG_COMPAT
1314 .compat_setsockopt = compat_sock_common_setsockopt,
1315 .compat_getsockopt = compat_sock_common_getsockopt,
1316 #endif
1317 };
1318
1319 static struct inet_protosw rawv6_protosw = {
1320 .type = SOCK_RAW,
1321 .protocol = IPPROTO_IP, /* wild card */
1322 .prot = &rawv6_prot,
1323 .ops = &inet6_sockraw_ops,
1324 .capability = CAP_NET_RAW,
1325 .no_check = UDP_CSUM_DEFAULT,
1326 .flags = INET_PROTOSW_REUSE,
1327 };
1328
1329 int __init rawv6_init(void)
1330 {
1331 int ret;
1332
1333 ret = inet6_register_protosw(&rawv6_protosw);
1334 if (ret)
1335 goto out;
1336 out:
1337 return ret;
1338 }
1339
1340 void rawv6_exit(void)
1341 {
1342 inet6_unregister_protosw(&rawv6_protosw);
1343 }
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