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[IPV6]: fix section mismatch warnings
[deliverable/linux.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(),
66 };
67
68 static void raw_v6_hash(struct sock *sk)
69 {
70 raw_hash_sk(sk, &raw_v6_hashinfo);
71 }
72
73 static void raw_v6_unhash(struct sock *sk)
74 {
75 raw_unhash_sk(sk, &raw_v6_hashinfo);
76 }
77
78
79 static struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num,
80 struct in6_addr *loc_addr, struct in6_addr *rmt_addr, int dif)
81 {
82 struct hlist_node *node;
83 int is_multicast = ipv6_addr_is_multicast(loc_addr);
84
85 sk_for_each_from(sk, node)
86 if (inet_sk(sk)->num == num) {
87 struct ipv6_pinfo *np = inet6_sk(sk);
88
89 if (!ipv6_addr_any(&np->daddr) &&
90 !ipv6_addr_equal(&np->daddr, rmt_addr))
91 continue;
92
93 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
94 continue;
95
96 if (!ipv6_addr_any(&np->rcv_saddr)) {
97 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
98 goto found;
99 if (is_multicast &&
100 inet6_mc_check(sk, loc_addr, rmt_addr))
101 goto found;
102 continue;
103 }
104 goto found;
105 }
106 sk = NULL;
107 found:
108 return sk;
109 }
110
111 /*
112 * 0 - deliver
113 * 1 - block
114 */
115 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb)
116 {
117 struct icmp6hdr *icmph;
118 struct raw6_sock *rp = raw6_sk(sk);
119
120 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) {
121 __u32 *data = &rp->filter.data[0];
122 int bit_nr;
123
124 icmph = (struct icmp6hdr *) skb->data;
125 bit_nr = icmph->icmp6_type;
126
127 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0;
128 }
129 return 0;
130 }
131
132 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
133 static int (*mh_filter)(struct sock *sock, struct sk_buff *skb);
134
135 int rawv6_mh_filter_register(int (*filter)(struct sock *sock,
136 struct sk_buff *skb))
137 {
138 rcu_assign_pointer(mh_filter, filter);
139 return 0;
140 }
141 EXPORT_SYMBOL(rawv6_mh_filter_register);
142
143 int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock,
144 struct sk_buff *skb))
145 {
146 rcu_assign_pointer(mh_filter, NULL);
147 synchronize_rcu();
148 return 0;
149 }
150 EXPORT_SYMBOL(rawv6_mh_filter_unregister);
151
152 #endif
153
154 /*
155 * demultiplex raw sockets.
156 * (should consider queueing the skb in the sock receive_queue
157 * without calling rawv6.c)
158 *
159 * Caller owns SKB so we must make clones.
160 */
161 static int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
162 {
163 struct in6_addr *saddr;
164 struct in6_addr *daddr;
165 struct sock *sk;
166 int delivered = 0;
167 __u8 hash;
168
169 saddr = &ipv6_hdr(skb)->saddr;
170 daddr = saddr + 1;
171
172 hash = nexthdr & (MAX_INET_PROTOS - 1);
173
174 read_lock(&raw_v6_hashinfo.lock);
175 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
176
177 /*
178 * The first socket found will be delivered after
179 * delivery to transport protocols.
180 */
181
182 if (sk == NULL)
183 goto out;
184
185 sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
186
187 while (sk) {
188 int filtered;
189
190 delivered = 1;
191 switch (nexthdr) {
192 case IPPROTO_ICMPV6:
193 filtered = icmpv6_filter(sk, skb);
194 break;
195
196 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
197 case IPPROTO_MH:
198 {
199 /* XXX: To validate MH only once for each packet,
200 * this is placed here. It should be after checking
201 * xfrm policy, however it doesn't. The checking xfrm
202 * policy is placed in rawv6_rcv() because it is
203 * required for each socket.
204 */
205 int (*filter)(struct sock *sock, struct sk_buff *skb);
206
207 filter = rcu_dereference(mh_filter);
208 filtered = filter ? filter(sk, skb) : 0;
209 break;
210 }
211 #endif
212 default:
213 filtered = 0;
214 break;
215 }
216
217 if (filtered < 0)
218 break;
219 if (filtered == 0) {
220 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
221
222 /* Not releasing hash table! */
223 if (clone) {
224 nf_reset(clone);
225 rawv6_rcv(sk, clone);
226 }
227 }
228 sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr,
229 IP6CB(skb)->iif);
230 }
231 out:
232 read_unlock(&raw_v6_hashinfo.lock);
233 return delivered;
234 }
235
236 int raw6_local_deliver(struct sk_buff *skb, int nexthdr)
237 {
238 struct sock *raw_sk;
239
240 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (MAX_INET_PROTOS - 1)]);
241 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
242 raw_sk = NULL;
243
244 return raw_sk != NULL;
245 }
246
247 /* This cleans up af_inet6 a bit. -DaveM */
248 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
249 {
250 struct inet_sock *inet = inet_sk(sk);
251 struct ipv6_pinfo *np = inet6_sk(sk);
252 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
253 __be32 v4addr = 0;
254 int addr_type;
255 int err;
256
257 if (addr_len < SIN6_LEN_RFC2133)
258 return -EINVAL;
259 addr_type = ipv6_addr_type(&addr->sin6_addr);
260
261 /* Raw sockets are IPv6 only */
262 if (addr_type == IPV6_ADDR_MAPPED)
263 return(-EADDRNOTAVAIL);
264
265 lock_sock(sk);
266
267 err = -EINVAL;
268 if (sk->sk_state != TCP_CLOSE)
269 goto out;
270
271 /* Check if the address belongs to the host. */
272 if (addr_type != IPV6_ADDR_ANY) {
273 struct net_device *dev = NULL;
274
275 if (addr_type & IPV6_ADDR_LINKLOCAL) {
276 if (addr_len >= sizeof(struct sockaddr_in6) &&
277 addr->sin6_scope_id) {
278 /* Override any existing binding, if another
279 * one is supplied by user.
280 */
281 sk->sk_bound_dev_if = addr->sin6_scope_id;
282 }
283
284 /* Binding to link-local address requires an interface */
285 if (!sk->sk_bound_dev_if)
286 goto out;
287
288 dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
289 if (!dev) {
290 err = -ENODEV;
291 goto out;
292 }
293 }
294
295 /* ipv4 addr of the socket is invalid. Only the
296 * unspecified and mapped address have a v4 equivalent.
297 */
298 v4addr = LOOPBACK4_IPV6;
299 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
300 err = -EADDRNOTAVAIL;
301 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
302 if (dev)
303 dev_put(dev);
304 goto out;
305 }
306 }
307 if (dev)
308 dev_put(dev);
309 }
310
311 inet->rcv_saddr = inet->saddr = v4addr;
312 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
313 if (!(addr_type & IPV6_ADDR_MULTICAST))
314 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
315 err = 0;
316 out:
317 release_sock(sk);
318 return err;
319 }
320
321 static void rawv6_err(struct sock *sk, struct sk_buff *skb,
322 struct inet6_skb_parm *opt,
323 int type, int code, int offset, __be32 info)
324 {
325 struct inet_sock *inet = inet_sk(sk);
326 struct ipv6_pinfo *np = inet6_sk(sk);
327 int err;
328 int harderr;
329
330 /* Report error on raw socket, if:
331 1. User requested recverr.
332 2. Socket is connected (otherwise the error indication
333 is useless without recverr and error is hard.
334 */
335 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
336 return;
337
338 harderr = icmpv6_err_convert(type, code, &err);
339 if (type == ICMPV6_PKT_TOOBIG)
340 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
341
342 if (np->recverr) {
343 u8 *payload = skb->data;
344 if (!inet->hdrincl)
345 payload += offset;
346 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
347 }
348
349 if (np->recverr || harderr) {
350 sk->sk_err = err;
351 sk->sk_error_report(sk);
352 }
353 }
354
355 void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
356 int type, int code, int inner_offset, __be32 info)
357 {
358 struct sock *sk;
359 int hash;
360 struct in6_addr *saddr, *daddr;
361
362 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
363
364 read_lock(&raw_v6_hashinfo.lock);
365 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
366 if (sk != NULL) {
367 saddr = &ipv6_hdr(skb)->saddr;
368 daddr = &ipv6_hdr(skb)->daddr;
369
370 while ((sk = __raw_v6_lookup(sk, nexthdr, saddr, daddr,
371 IP6CB(skb)->iif))) {
372 rawv6_err(sk, skb, NULL, type, code,
373 inner_offset, info);
374 sk = sk_next(sk);
375 }
376 }
377 read_unlock(&raw_v6_hashinfo.lock);
378 }
379
380 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
381 {
382 if ((raw6_sk(sk)->checksum || sk->sk_filter) &&
383 skb_checksum_complete(skb)) {
384 atomic_inc(&sk->sk_drops);
385 kfree_skb(skb);
386 return 0;
387 }
388
389 /* Charge it to the socket. */
390 if (sock_queue_rcv_skb(sk,skb)<0) {
391 atomic_inc(&sk->sk_drops);
392 kfree_skb(skb);
393 return 0;
394 }
395
396 return 0;
397 }
398
399 /*
400 * This is next to useless...
401 * if we demultiplex in network layer we don't need the extra call
402 * just to queue the skb...
403 * maybe we could have the network decide upon a hint if it
404 * should call raw_rcv for demultiplexing
405 */
406 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
407 {
408 struct inet_sock *inet = inet_sk(sk);
409 struct raw6_sock *rp = raw6_sk(sk);
410
411 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
412 atomic_inc(&sk->sk_drops);
413 kfree_skb(skb);
414 return NET_RX_DROP;
415 }
416
417 if (!rp->checksum)
418 skb->ip_summed = CHECKSUM_UNNECESSARY;
419
420 if (skb->ip_summed == CHECKSUM_COMPLETE) {
421 skb_postpull_rcsum(skb, skb_network_header(skb),
422 skb_network_header_len(skb));
423 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
424 &ipv6_hdr(skb)->daddr,
425 skb->len, inet->num, skb->csum))
426 skb->ip_summed = CHECKSUM_UNNECESSARY;
427 }
428 if (!skb_csum_unnecessary(skb))
429 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
430 &ipv6_hdr(skb)->daddr,
431 skb->len,
432 inet->num, 0));
433
434 if (inet->hdrincl) {
435 if (skb_checksum_complete(skb)) {
436 atomic_inc(&sk->sk_drops);
437 kfree_skb(skb);
438 return 0;
439 }
440 }
441
442 rawv6_rcv_skb(sk, skb);
443 return 0;
444 }
445
446
447 /*
448 * This should be easy, if there is something there
449 * we return it, otherwise we block.
450 */
451
452 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
453 struct msghdr *msg, size_t len,
454 int noblock, int flags, int *addr_len)
455 {
456 struct ipv6_pinfo *np = inet6_sk(sk);
457 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
458 struct sk_buff *skb;
459 size_t copied;
460 int err;
461
462 if (flags & MSG_OOB)
463 return -EOPNOTSUPP;
464
465 if (addr_len)
466 *addr_len=sizeof(*sin6);
467
468 if (flags & MSG_ERRQUEUE)
469 return ipv6_recv_error(sk, msg, len);
470
471 skb = skb_recv_datagram(sk, flags, noblock, &err);
472 if (!skb)
473 goto out;
474
475 copied = skb->len;
476 if (copied > len) {
477 copied = len;
478 msg->msg_flags |= MSG_TRUNC;
479 }
480
481 if (skb_csum_unnecessary(skb)) {
482 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
483 } else if (msg->msg_flags&MSG_TRUNC) {
484 if (__skb_checksum_complete(skb))
485 goto csum_copy_err;
486 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
487 } else {
488 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
489 if (err == -EINVAL)
490 goto csum_copy_err;
491 }
492 if (err)
493 goto out_free;
494
495 /* Copy the address. */
496 if (sin6) {
497 sin6->sin6_family = AF_INET6;
498 sin6->sin6_port = 0;
499 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
500 sin6->sin6_flowinfo = 0;
501 sin6->sin6_scope_id = 0;
502 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
503 sin6->sin6_scope_id = IP6CB(skb)->iif;
504 }
505
506 sock_recv_timestamp(msg, sk, skb);
507
508 if (np->rxopt.all)
509 datagram_recv_ctl(sk, msg, skb);
510
511 err = copied;
512 if (flags & MSG_TRUNC)
513 err = skb->len;
514
515 out_free:
516 skb_free_datagram(sk, skb);
517 out:
518 return err;
519
520 csum_copy_err:
521 skb_kill_datagram(sk, skb, flags);
522
523 /* Error for blocking case is chosen to masquerade
524 as some normal condition.
525 */
526 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
527 atomic_inc(&sk->sk_drops);
528 goto out;
529 }
530
531 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
532 struct raw6_sock *rp)
533 {
534 struct sk_buff *skb;
535 int err = 0;
536 int offset;
537 int len;
538 int total_len;
539 __wsum tmp_csum;
540 __sum16 csum;
541
542 if (!rp->checksum)
543 goto send;
544
545 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
546 goto out;
547
548 offset = rp->offset;
549 total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) -
550 skb->data);
551 if (offset >= total_len - 1) {
552 err = -EINVAL;
553 ip6_flush_pending_frames(sk);
554 goto out;
555 }
556
557 /* should be check HW csum miyazawa */
558 if (skb_queue_len(&sk->sk_write_queue) == 1) {
559 /*
560 * Only one fragment on the socket.
561 */
562 tmp_csum = skb->csum;
563 } else {
564 struct sk_buff *csum_skb = NULL;
565 tmp_csum = 0;
566
567 skb_queue_walk(&sk->sk_write_queue, skb) {
568 tmp_csum = csum_add(tmp_csum, skb->csum);
569
570 if (csum_skb)
571 continue;
572
573 len = skb->len - skb_transport_offset(skb);
574 if (offset >= len) {
575 offset -= len;
576 continue;
577 }
578
579 csum_skb = skb;
580 }
581
582 skb = csum_skb;
583 }
584
585 offset += skb_transport_offset(skb);
586 if (skb_copy_bits(skb, offset, &csum, 2))
587 BUG();
588
589 /* in case cksum was not initialized */
590 if (unlikely(csum))
591 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
592
593 csum = csum_ipv6_magic(&fl->fl6_src,
594 &fl->fl6_dst,
595 total_len, fl->proto, tmp_csum);
596
597 if (csum == 0 && fl->proto == IPPROTO_UDP)
598 csum = CSUM_MANGLED_0;
599
600 if (skb_store_bits(skb, offset, &csum, 2))
601 BUG();
602
603 send:
604 err = ip6_push_pending_frames(sk);
605 out:
606 return err;
607 }
608
609 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
610 struct flowi *fl, struct rt6_info *rt,
611 unsigned int flags)
612 {
613 struct ipv6_pinfo *np = inet6_sk(sk);
614 struct ipv6hdr *iph;
615 struct sk_buff *skb;
616 unsigned int hh_len;
617 int err;
618
619 if (length > rt->u.dst.dev->mtu) {
620 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu);
621 return -EMSGSIZE;
622 }
623 if (flags&MSG_PROBE)
624 goto out;
625
626 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
627
628 skb = sock_alloc_send_skb(sk, length+hh_len+15,
629 flags&MSG_DONTWAIT, &err);
630 if (skb == NULL)
631 goto error;
632 skb_reserve(skb, hh_len);
633
634 skb->priority = sk->sk_priority;
635 skb->dst = dst_clone(&rt->u.dst);
636
637 skb_put(skb, length);
638 skb_reset_network_header(skb);
639 iph = ipv6_hdr(skb);
640
641 skb->ip_summed = CHECKSUM_NONE;
642
643 skb->transport_header = skb->network_header;
644 err = memcpy_fromiovecend((void *)iph, from, 0, length);
645 if (err)
646 goto error_fault;
647
648 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS);
649 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
650 dst_output);
651 if (err > 0)
652 err = np->recverr ? net_xmit_errno(err) : 0;
653 if (err)
654 goto error;
655 out:
656 return 0;
657
658 error_fault:
659 err = -EFAULT;
660 kfree_skb(skb);
661 error:
662 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
663 return err;
664 }
665
666 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
667 {
668 struct iovec *iov;
669 u8 __user *type = NULL;
670 u8 __user *code = NULL;
671 u8 len = 0;
672 int probed = 0;
673 int i;
674
675 if (!msg->msg_iov)
676 return 0;
677
678 for (i = 0; i < msg->msg_iovlen; i++) {
679 iov = &msg->msg_iov[i];
680 if (!iov)
681 continue;
682
683 switch (fl->proto) {
684 case IPPROTO_ICMPV6:
685 /* check if one-byte field is readable or not. */
686 if (iov->iov_base && iov->iov_len < 1)
687 break;
688
689 if (!type) {
690 type = iov->iov_base;
691 /* check if code field is readable or not. */
692 if (iov->iov_len > 1)
693 code = type + 1;
694 } else if (!code)
695 code = iov->iov_base;
696
697 if (type && code) {
698 if (get_user(fl->fl_icmp_type, type) ||
699 get_user(fl->fl_icmp_code, code))
700 return -EFAULT;
701 probed = 1;
702 }
703 break;
704 case IPPROTO_MH:
705 if (iov->iov_base && iov->iov_len < 1)
706 break;
707 /* check if type field is readable or not. */
708 if (iov->iov_len > 2 - len) {
709 u8 __user *p = iov->iov_base;
710 if (get_user(fl->fl_mh_type, &p[2 - len]))
711 return -EFAULT;
712 probed = 1;
713 } else
714 len += iov->iov_len;
715
716 break;
717 default:
718 probed = 1;
719 break;
720 }
721 if (probed)
722 break;
723 }
724 return 0;
725 }
726
727 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
728 struct msghdr *msg, size_t len)
729 {
730 struct ipv6_txoptions opt_space;
731 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
732 struct in6_addr *daddr, *final_p = NULL, final;
733 struct inet_sock *inet = inet_sk(sk);
734 struct ipv6_pinfo *np = inet6_sk(sk);
735 struct raw6_sock *rp = raw6_sk(sk);
736 struct ipv6_txoptions *opt = NULL;
737 struct ip6_flowlabel *flowlabel = NULL;
738 struct dst_entry *dst = NULL;
739 struct flowi fl;
740 int addr_len = msg->msg_namelen;
741 int hlimit = -1;
742 int tclass = -1;
743 u16 proto;
744 int err;
745
746 /* Rough check on arithmetic overflow,
747 better check is made in ip6_append_data().
748 */
749 if (len > INT_MAX)
750 return -EMSGSIZE;
751
752 /* Mirror BSD error message compatibility */
753 if (msg->msg_flags & MSG_OOB)
754 return -EOPNOTSUPP;
755
756 /*
757 * Get and verify the address.
758 */
759 memset(&fl, 0, sizeof(fl));
760
761 if (sin6) {
762 if (addr_len < SIN6_LEN_RFC2133)
763 return -EINVAL;
764
765 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
766 return(-EAFNOSUPPORT);
767
768 /* port is the proto value [0..255] carried in nexthdr */
769 proto = ntohs(sin6->sin6_port);
770
771 if (!proto)
772 proto = inet->num;
773 else if (proto != inet->num)
774 return(-EINVAL);
775
776 if (proto > 255)
777 return(-EINVAL);
778
779 daddr = &sin6->sin6_addr;
780 if (np->sndflow) {
781 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
782 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
783 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
784 if (flowlabel == NULL)
785 return -EINVAL;
786 daddr = &flowlabel->dst;
787 }
788 }
789
790 /*
791 * Otherwise it will be difficult to maintain
792 * sk->sk_dst_cache.
793 */
794 if (sk->sk_state == TCP_ESTABLISHED &&
795 ipv6_addr_equal(daddr, &np->daddr))
796 daddr = &np->daddr;
797
798 if (addr_len >= sizeof(struct sockaddr_in6) &&
799 sin6->sin6_scope_id &&
800 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
801 fl.oif = sin6->sin6_scope_id;
802 } else {
803 if (sk->sk_state != TCP_ESTABLISHED)
804 return -EDESTADDRREQ;
805
806 proto = inet->num;
807 daddr = &np->daddr;
808 fl.fl6_flowlabel = np->flow_label;
809 }
810
811 if (ipv6_addr_any(daddr)) {
812 /*
813 * unspecified destination address
814 * treated as error... is this correct ?
815 */
816 fl6_sock_release(flowlabel);
817 return(-EINVAL);
818 }
819
820 if (fl.oif == 0)
821 fl.oif = sk->sk_bound_dev_if;
822
823 if (msg->msg_controllen) {
824 opt = &opt_space;
825 memset(opt, 0, sizeof(struct ipv6_txoptions));
826 opt->tot_len = sizeof(struct ipv6_txoptions);
827
828 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
829 if (err < 0) {
830 fl6_sock_release(flowlabel);
831 return err;
832 }
833 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
834 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
835 if (flowlabel == NULL)
836 return -EINVAL;
837 }
838 if (!(opt->opt_nflen|opt->opt_flen))
839 opt = NULL;
840 }
841 if (opt == NULL)
842 opt = np->opt;
843 if (flowlabel)
844 opt = fl6_merge_options(&opt_space, flowlabel, opt);
845 opt = ipv6_fixup_options(&opt_space, opt);
846
847 fl.proto = proto;
848 err = rawv6_probe_proto_opt(&fl, msg);
849 if (err)
850 goto out;
851
852 ipv6_addr_copy(&fl.fl6_dst, daddr);
853 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
854 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
855
856 /* merge ip6_build_xmit from ip6_output */
857 if (opt && opt->srcrt) {
858 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
859 ipv6_addr_copy(&final, &fl.fl6_dst);
860 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
861 final_p = &final;
862 }
863
864 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
865 fl.oif = np->mcast_oif;
866 security_sk_classify_flow(sk, &fl);
867
868 err = ip6_dst_lookup(sk, &dst, &fl);
869 if (err)
870 goto out;
871 if (final_p)
872 ipv6_addr_copy(&fl.fl6_dst, final_p);
873
874 if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) {
875 if (err == -EREMOTE)
876 err = ip6_dst_blackhole(sk, &dst, &fl);
877 if (err < 0)
878 goto out;
879 }
880
881 if (hlimit < 0) {
882 if (ipv6_addr_is_multicast(&fl.fl6_dst))
883 hlimit = np->mcast_hops;
884 else
885 hlimit = np->hop_limit;
886 if (hlimit < 0)
887 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
888 if (hlimit < 0)
889 hlimit = ipv6_get_hoplimit(dst->dev);
890 }
891
892 if (tclass < 0) {
893 tclass = np->tclass;
894 if (tclass < 0)
895 tclass = 0;
896 }
897
898 if (msg->msg_flags&MSG_CONFIRM)
899 goto do_confirm;
900
901 back_from_confirm:
902 if (inet->hdrincl) {
903 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags);
904 } else {
905 lock_sock(sk);
906 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
907 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst,
908 msg->msg_flags);
909
910 if (err)
911 ip6_flush_pending_frames(sk);
912 else if (!(msg->msg_flags & MSG_MORE))
913 err = rawv6_push_pending_frames(sk, &fl, rp);
914 release_sock(sk);
915 }
916 done:
917 dst_release(dst);
918 out:
919 fl6_sock_release(flowlabel);
920 return err<0?err:len;
921 do_confirm:
922 dst_confirm(dst);
923 if (!(msg->msg_flags & MSG_PROBE) || len)
924 goto back_from_confirm;
925 err = 0;
926 goto done;
927 }
928
929 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
930 char __user *optval, int optlen)
931 {
932 switch (optname) {
933 case ICMPV6_FILTER:
934 if (optlen > sizeof(struct icmp6_filter))
935 optlen = sizeof(struct icmp6_filter);
936 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
937 return -EFAULT;
938 return 0;
939 default:
940 return -ENOPROTOOPT;
941 }
942
943 return 0;
944 }
945
946 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
947 char __user *optval, int __user *optlen)
948 {
949 int len;
950
951 switch (optname) {
952 case ICMPV6_FILTER:
953 if (get_user(len, optlen))
954 return -EFAULT;
955 if (len < 0)
956 return -EINVAL;
957 if (len > sizeof(struct icmp6_filter))
958 len = sizeof(struct icmp6_filter);
959 if (put_user(len, optlen))
960 return -EFAULT;
961 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
962 return -EFAULT;
963 return 0;
964 default:
965 return -ENOPROTOOPT;
966 }
967
968 return 0;
969 }
970
971
972 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
973 char __user *optval, int optlen)
974 {
975 struct raw6_sock *rp = raw6_sk(sk);
976 int val;
977
978 if (get_user(val, (int __user *)optval))
979 return -EFAULT;
980
981 switch (optname) {
982 case IPV6_CHECKSUM:
983 /* You may get strange result with a positive odd offset;
984 RFC2292bis agrees with me. */
985 if (val > 0 && (val&1))
986 return(-EINVAL);
987 if (val < 0) {
988 rp->checksum = 0;
989 } else {
990 rp->checksum = 1;
991 rp->offset = val;
992 }
993
994 return 0;
995 break;
996
997 default:
998 return(-ENOPROTOOPT);
999 }
1000 }
1001
1002 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1003 char __user *optval, int optlen)
1004 {
1005 switch(level) {
1006 case SOL_RAW:
1007 break;
1008
1009 case SOL_ICMPV6:
1010 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1011 return -EOPNOTSUPP;
1012 return rawv6_seticmpfilter(sk, level, optname, optval,
1013 optlen);
1014 case SOL_IPV6:
1015 if (optname == IPV6_CHECKSUM)
1016 break;
1017 default:
1018 return ipv6_setsockopt(sk, level, optname, optval,
1019 optlen);
1020 }
1021
1022 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1023 }
1024
1025 #ifdef CONFIG_COMPAT
1026 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1027 char __user *optval, int optlen)
1028 {
1029 switch (level) {
1030 case SOL_RAW:
1031 break;
1032 case SOL_ICMPV6:
1033 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1034 return -EOPNOTSUPP;
1035 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1036 case SOL_IPV6:
1037 if (optname == IPV6_CHECKSUM)
1038 break;
1039 default:
1040 return compat_ipv6_setsockopt(sk, level, optname,
1041 optval, optlen);
1042 }
1043 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1044 }
1045 #endif
1046
1047 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1048 char __user *optval, int __user *optlen)
1049 {
1050 struct raw6_sock *rp = raw6_sk(sk);
1051 int val, len;
1052
1053 if (get_user(len,optlen))
1054 return -EFAULT;
1055
1056 switch (optname) {
1057 case IPV6_CHECKSUM:
1058 if (rp->checksum == 0)
1059 val = -1;
1060 else
1061 val = rp->offset;
1062 break;
1063
1064 default:
1065 return -ENOPROTOOPT;
1066 }
1067
1068 len = min_t(unsigned int, sizeof(int), len);
1069
1070 if (put_user(len, optlen))
1071 return -EFAULT;
1072 if (copy_to_user(optval,&val,len))
1073 return -EFAULT;
1074 return 0;
1075 }
1076
1077 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1078 char __user *optval, int __user *optlen)
1079 {
1080 switch(level) {
1081 case SOL_RAW:
1082 break;
1083
1084 case SOL_ICMPV6:
1085 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1086 return -EOPNOTSUPP;
1087 return rawv6_geticmpfilter(sk, level, optname, optval,
1088 optlen);
1089 case SOL_IPV6:
1090 if (optname == IPV6_CHECKSUM)
1091 break;
1092 default:
1093 return ipv6_getsockopt(sk, level, optname, optval,
1094 optlen);
1095 }
1096
1097 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1098 }
1099
1100 #ifdef CONFIG_COMPAT
1101 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1102 char __user *optval, int __user *optlen)
1103 {
1104 switch (level) {
1105 case SOL_RAW:
1106 break;
1107 case SOL_ICMPV6:
1108 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1109 return -EOPNOTSUPP;
1110 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1111 case SOL_IPV6:
1112 if (optname == IPV6_CHECKSUM)
1113 break;
1114 default:
1115 return compat_ipv6_getsockopt(sk, level, optname,
1116 optval, optlen);
1117 }
1118 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1119 }
1120 #endif
1121
1122 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1123 {
1124 switch(cmd) {
1125 case SIOCOUTQ:
1126 {
1127 int amount = atomic_read(&sk->sk_wmem_alloc);
1128 return put_user(amount, (int __user *)arg);
1129 }
1130 case SIOCINQ:
1131 {
1132 struct sk_buff *skb;
1133 int amount = 0;
1134
1135 spin_lock_bh(&sk->sk_receive_queue.lock);
1136 skb = skb_peek(&sk->sk_receive_queue);
1137 if (skb != NULL)
1138 amount = skb->tail - skb->transport_header;
1139 spin_unlock_bh(&sk->sk_receive_queue.lock);
1140 return put_user(amount, (int __user *)arg);
1141 }
1142
1143 default:
1144 return -ENOIOCTLCMD;
1145 }
1146 }
1147
1148 static void rawv6_close(struct sock *sk, long timeout)
1149 {
1150 if (inet_sk(sk)->num == IPPROTO_RAW)
1151 ip6_ra_control(sk, -1, NULL);
1152
1153 sk_common_release(sk);
1154 }
1155
1156 static int rawv6_init_sk(struct sock *sk)
1157 {
1158 struct raw6_sock *rp = raw6_sk(sk);
1159
1160 switch (inet_sk(sk)->num) {
1161 case IPPROTO_ICMPV6:
1162 rp->checksum = 1;
1163 rp->offset = 2;
1164 break;
1165 case IPPROTO_MH:
1166 rp->checksum = 1;
1167 rp->offset = 4;
1168 break;
1169 default:
1170 break;
1171 }
1172 return(0);
1173 }
1174
1175 DEFINE_PROTO_INUSE(rawv6)
1176
1177 struct proto rawv6_prot = {
1178 .name = "RAWv6",
1179 .owner = THIS_MODULE,
1180 .close = rawv6_close,
1181 .connect = ip6_datagram_connect,
1182 .disconnect = udp_disconnect,
1183 .ioctl = rawv6_ioctl,
1184 .init = rawv6_init_sk,
1185 .destroy = inet6_destroy_sock,
1186 .setsockopt = rawv6_setsockopt,
1187 .getsockopt = rawv6_getsockopt,
1188 .sendmsg = rawv6_sendmsg,
1189 .recvmsg = rawv6_recvmsg,
1190 .bind = rawv6_bind,
1191 .backlog_rcv = rawv6_rcv_skb,
1192 .hash = raw_v6_hash,
1193 .unhash = raw_v6_unhash,
1194 .obj_size = sizeof(struct raw6_sock),
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(file, &raw_v6_hashinfo, PF_INET6);
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_private,
1262 };
1263
1264 int __init raw6_proc_init(void)
1265 {
1266 if (!proc_net_fops_create(&init_net, "raw6", S_IRUGO, &raw6_seq_fops))
1267 return -ENOMEM;
1268 return 0;
1269 }
1270
1271 void raw6_proc_exit(void)
1272 {
1273 proc_net_remove(&init_net, "raw6");
1274 }
1275 #endif /* CONFIG_PROC_FS */
1276
1277 /* Same as inet6_dgram_ops, sans udp_poll. */
1278 static const struct proto_ops inet6_sockraw_ops = {
1279 .family = PF_INET6,
1280 .owner = THIS_MODULE,
1281 .release = inet6_release,
1282 .bind = inet6_bind,
1283 .connect = inet_dgram_connect, /* ok */
1284 .socketpair = sock_no_socketpair, /* a do nothing */
1285 .accept = sock_no_accept, /* a do nothing */
1286 .getname = inet6_getname,
1287 .poll = datagram_poll, /* ok */
1288 .ioctl = inet6_ioctl, /* must change */
1289 .listen = sock_no_listen, /* ok */
1290 .shutdown = inet_shutdown, /* ok */
1291 .setsockopt = sock_common_setsockopt, /* ok */
1292 .getsockopt = sock_common_getsockopt, /* ok */
1293 .sendmsg = inet_sendmsg, /* ok */
1294 .recvmsg = sock_common_recvmsg, /* ok */
1295 .mmap = sock_no_mmap,
1296 .sendpage = sock_no_sendpage,
1297 #ifdef CONFIG_COMPAT
1298 .compat_setsockopt = compat_sock_common_setsockopt,
1299 .compat_getsockopt = compat_sock_common_getsockopt,
1300 #endif
1301 };
1302
1303 static struct inet_protosw rawv6_protosw = {
1304 .type = SOCK_RAW,
1305 .protocol = IPPROTO_IP, /* wild card */
1306 .prot = &rawv6_prot,
1307 .ops = &inet6_sockraw_ops,
1308 .capability = CAP_NET_RAW,
1309 .no_check = UDP_CSUM_DEFAULT,
1310 .flags = INET_PROTOSW_REUSE,
1311 };
1312
1313 int __init rawv6_init(void)
1314 {
1315 int ret;
1316
1317 ret = inet6_register_protosw(&rawv6_protosw);
1318 if (ret)
1319 goto out;
1320 out:
1321 return ret;
1322 }
1323
1324 void rawv6_exit(void)
1325 {
1326 inet6_unregister_protosw(&rawv6_protosw);
1327 }
Linux kernel - Deliverables
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