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net: convert unicast addr list
[linux-2.6/verdex.git] / net / ipv6 / raw.c
blobe99307fba0b1866e8fb5098b74328293f472a748
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 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance)
13 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 */
20
21 #include <linux/errno.h>
22 #include <linux/types.h>
23 #include <linux/socket.h>
24 #include <linux/sockios.h>
25 #include <linux/net.h>
26 #include <linux/in6.h>
27 #include <linux/netdevice.h>
28 #include <linux/if_arp.h>
29 #include <linux/icmpv6.h>
30 #include <linux/netfilter.h>
31 #include <linux/netfilter_ipv6.h>
32 #include <linux/skbuff.h>
33 #include <asm/uaccess.h>
34 #include <asm/ioctls.h>
35
36 #include <net/net_namespace.h>
37 #include <net/ip.h>
38 #include <net/sock.h>
39 #include <net/snmp.h>
40
41 #include <net/ipv6.h>
42 #include <net/ndisc.h>
43 #include <net/protocol.h>
44 #include <net/ip6_route.h>
45 #include <net/ip6_checksum.h>
46 #include <net/addrconf.h>
47 #include <net/transp_v6.h>
48 #include <net/udp.h>
49 #include <net/inet_common.h>
50 #include <net/tcp_states.h>
51 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
52 #include <net/mip6.h>
53 #endif
54 #include <linux/mroute6.h>
55
56 #include <net/raw.h>
57 #include <net/rawv6.h>
58 #include <net/xfrm.h>
59
60 #include <linux/proc_fs.h>
61 #include <linux/seq_file.h>
62
63 static struct raw_hashinfo raw_v6_hashinfo = {
64 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
65 };
66
67 static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
68 unsigned short num, struct in6_addr *loc_addr,
69 struct in6_addr *rmt_addr, int dif)
70 {
71 struct hlist_node *node;
72 int is_multicast = ipv6_addr_is_multicast(loc_addr);
73
74 sk_for_each_from(sk, node)
75 if (inet_sk(sk)->num == num) {
76 struct ipv6_pinfo *np = inet6_sk(sk);
77
78 if (!net_eq(sock_net(sk), net))
79 continue;
80
81 if (!ipv6_addr_any(&np->daddr) &&
82 !ipv6_addr_equal(&np->daddr, rmt_addr))
83 continue;
84
85 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
86 continue;
87
88 if (!ipv6_addr_any(&np->rcv_saddr)) {
89 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
90 goto found;
91 if (is_multicast &&
92 inet6_mc_check(sk, loc_addr, rmt_addr))
93 goto found;
94 continue;
95 }
96 goto found;
97 }
98 sk = NULL;
99 found:
100 return sk;
101 }
102
103 /*
104 * 0 - deliver
105 * 1 - block
106 */
107 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb)
108 {
109 struct icmp6hdr *icmph;
110 struct raw6_sock *rp = raw6_sk(sk);
111
112 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) {
113 __u32 *data = &rp->filter.data[0];
114 int bit_nr;
115
116 icmph = (struct icmp6hdr *) skb->data;
117 bit_nr = icmph->icmp6_type;
118
119 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0;
120 }
121 return 0;
122 }
123
124 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
125 static int (*mh_filter)(struct sock *sock, struct sk_buff *skb);
126
127 int rawv6_mh_filter_register(int (*filter)(struct sock *sock,
128 struct sk_buff *skb))
129 {
130 rcu_assign_pointer(mh_filter, filter);
131 return 0;
132 }
133 EXPORT_SYMBOL(rawv6_mh_filter_register);
134
135 int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock,
136 struct sk_buff *skb))
137 {
138 rcu_assign_pointer(mh_filter, NULL);
139 synchronize_rcu();
140 return 0;
141 }
142 EXPORT_SYMBOL(rawv6_mh_filter_unregister);
143
144 #endif
145
146 /*
147 * demultiplex raw sockets.
148 * (should consider queueing the skb in the sock receive_queue
149 * without calling rawv6.c)
150 *
151 * Caller owns SKB so we must make clones.
152 */
153 static int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
154 {
155 struct in6_addr *saddr;
156 struct in6_addr *daddr;
157 struct sock *sk;
158 int delivered = 0;
159 __u8 hash;
160 struct net *net;
161
162 saddr = &ipv6_hdr(skb)->saddr;
163 daddr = saddr + 1;
164
165 hash = nexthdr & (MAX_INET_PROTOS - 1);
166
167 read_lock(&raw_v6_hashinfo.lock);
168 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
169
170 if (sk == NULL)
171 goto out;
172
173 net = dev_net(skb->dev);
174 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
175
176 while (sk) {
177 int filtered;
178
179 delivered = 1;
180 switch (nexthdr) {
181 case IPPROTO_ICMPV6:
182 filtered = icmpv6_filter(sk, skb);
183 break;
184
185 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
186 case IPPROTO_MH:
187 {
188 /* XXX: To validate MH only once for each packet,
189 * this is placed here. It should be after checking
190 * xfrm policy, however it doesn't. The checking xfrm
191 * policy is placed in rawv6_rcv() because it is
192 * required for each socket.
193 */
194 int (*filter)(struct sock *sock, struct sk_buff *skb);
195
196 filter = rcu_dereference(mh_filter);
197 filtered = filter ? filter(sk, skb) : 0;
198 break;
199 }
200 #endif
201 default:
202 filtered = 0;
203 break;
204 }
205
206 if (filtered < 0)
207 break;
208 if (filtered == 0) {
209 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
210
211 /* Not releasing hash table! */
212 if (clone) {
213 nf_reset(clone);
214 rawv6_rcv(sk, clone);
215 }
216 }
217 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
218 IP6CB(skb)->iif);
219 }
220 out:
221 read_unlock(&raw_v6_hashinfo.lock);
222 return delivered;
223 }
224
225 int raw6_local_deliver(struct sk_buff *skb, int nexthdr)
226 {
227 struct sock *raw_sk;
228
229 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (MAX_INET_PROTOS - 1)]);
230 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
231 raw_sk = NULL;
232
233 return raw_sk != NULL;
234 }
235
236 /* This cleans up af_inet6 a bit. -DaveM */
237 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
238 {
239 struct inet_sock *inet = inet_sk(sk);
240 struct ipv6_pinfo *np = inet6_sk(sk);
241 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
242 __be32 v4addr = 0;
243 int addr_type;
244 int err;
245
246 if (addr_len < SIN6_LEN_RFC2133)
247 return -EINVAL;
248 addr_type = ipv6_addr_type(&addr->sin6_addr);
249
250 /* Raw sockets are IPv6 only */
251 if (addr_type == IPV6_ADDR_MAPPED)
252 return(-EADDRNOTAVAIL);
253
254 lock_sock(sk);
255
256 err = -EINVAL;
257 if (sk->sk_state != TCP_CLOSE)
258 goto out;
259
260 /* Check if the address belongs to the host. */
261 if (addr_type != IPV6_ADDR_ANY) {
262 struct net_device *dev = NULL;
263
264 if (addr_type & IPV6_ADDR_LINKLOCAL) {
265 if (addr_len >= sizeof(struct sockaddr_in6) &&
266 addr->sin6_scope_id) {
267 /* Override any existing binding, if another
268 * one is supplied by user.
269 */
270 sk->sk_bound_dev_if = addr->sin6_scope_id;
271 }
272
273 /* Binding to link-local address requires an interface */
274 if (!sk->sk_bound_dev_if)
275 goto out;
276
277 dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if);
278 if (!dev) {
279 err = -ENODEV;
280 goto out;
281 }
282 }
283
284 /* ipv4 addr of the socket is invalid. Only the
285 * unspecified and mapped address have a v4 equivalent.
286 */
287 v4addr = LOOPBACK4_IPV6;
288 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
289 err = -EADDRNOTAVAIL;
290 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
291 dev, 0)) {
292 if (dev)
293 dev_put(dev);
294 goto out;
295 }
296 }
297 if (dev)
298 dev_put(dev);
299 }
300
301 inet->rcv_saddr = inet->saddr = v4addr;
302 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
303 if (!(addr_type & IPV6_ADDR_MULTICAST))
304 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
305 err = 0;
306 out:
307 release_sock(sk);
308 return err;
309 }
310
311 static void rawv6_err(struct sock *sk, struct sk_buff *skb,
312 struct inet6_skb_parm *opt,
313 int type, int code, int offset, __be32 info)
314 {
315 struct inet_sock *inet = inet_sk(sk);
316 struct ipv6_pinfo *np = inet6_sk(sk);
317 int err;
318 int harderr;
319
320 /* Report error on raw socket, if:
321 1. User requested recverr.
322 2. Socket is connected (otherwise the error indication
323 is useless without recverr and error is hard.
324 */
325 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
326 return;
327
328 harderr = icmpv6_err_convert(type, code, &err);
329 if (type == ICMPV6_PKT_TOOBIG)
330 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
331
332 if (np->recverr) {
333 u8 *payload = skb->data;
334 if (!inet->hdrincl)
335 payload += offset;
336 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
337 }
338
339 if (np->recverr || harderr) {
340 sk->sk_err = err;
341 sk->sk_error_report(sk);
342 }
343 }
344
345 void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
346 int type, int code, int inner_offset, __be32 info)
347 {
348 struct sock *sk;
349 int hash;
350 struct in6_addr *saddr, *daddr;
351 struct net *net;
352
353 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
354
355 read_lock(&raw_v6_hashinfo.lock);
356 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
357 if (sk != NULL) {
358 /* Note: ipv6_hdr(skb) != skb->data */
359 struct ipv6hdr *ip6h = (struct ipv6hdr *)skb->data;
360 saddr = &ip6h->saddr;
361 daddr = &ip6h->daddr;
362 net = dev_net(skb->dev);
363
364 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
365 IP6CB(skb)->iif))) {
366 rawv6_err(sk, skb, NULL, type, code,
367 inner_offset, info);
368 sk = sk_next(sk);
369 }
370 }
371 read_unlock(&raw_v6_hashinfo.lock);
372 }
373
374 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
375 {
376 if ((raw6_sk(sk)->checksum || sk->sk_filter) &&
377 skb_checksum_complete(skb)) {
378 atomic_inc(&sk->sk_drops);
379 kfree_skb(skb);
380 return NET_RX_DROP;
381 }
382
383 /* Charge it to the socket. */
384 if (sock_queue_rcv_skb(sk,skb)<0) {
385 atomic_inc(&sk->sk_drops);
386 kfree_skb(skb);
387 return NET_RX_DROP;
388 }
389
390 return 0;
391 }
392
393 /*
394 * This is next to useless...
395 * if we demultiplex in network layer we don't need the extra call
396 * just to queue the skb...
397 * maybe we could have the network decide upon a hint if it
398 * should call raw_rcv for demultiplexing
399 */
400 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
401 {
402 struct inet_sock *inet = inet_sk(sk);
403 struct raw6_sock *rp = raw6_sk(sk);
404
405 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
406 atomic_inc(&sk->sk_drops);
407 kfree_skb(skb);
408 return NET_RX_DROP;
409 }
410
411 if (!rp->checksum)
412 skb->ip_summed = CHECKSUM_UNNECESSARY;
413
414 if (skb->ip_summed == CHECKSUM_COMPLETE) {
415 skb_postpull_rcsum(skb, skb_network_header(skb),
416 skb_network_header_len(skb));
417 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
418 &ipv6_hdr(skb)->daddr,
419 skb->len, inet->num, skb->csum))
420 skb->ip_summed = CHECKSUM_UNNECESSARY;
421 }
422 if (!skb_csum_unnecessary(skb))
423 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
424 &ipv6_hdr(skb)->daddr,
425 skb->len,
426 inet->num, 0));
427
428 if (inet->hdrincl) {
429 if (skb_checksum_complete(skb)) {
430 atomic_inc(&sk->sk_drops);
431 kfree_skb(skb);
432 return NET_RX_DROP;
433 }
434 }
435
436 rawv6_rcv_skb(sk, skb);
437 return 0;
438 }
439
440
441 /*
442 * This should be easy, if there is something there
443 * we return it, otherwise we block.
444 */
445
446 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
447 struct msghdr *msg, size_t len,
448 int noblock, int flags, int *addr_len)
449 {
450 struct ipv6_pinfo *np = inet6_sk(sk);
451 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
452 struct sk_buff *skb;
453 size_t copied;
454 int err;
455
456 if (flags & MSG_OOB)
457 return -EOPNOTSUPP;
458
459 if (addr_len)
460 *addr_len=sizeof(*sin6);
461
462 if (flags & MSG_ERRQUEUE)
463 return ipv6_recv_error(sk, msg, len);
464
465 skb = skb_recv_datagram(sk, flags, noblock, &err);
466 if (!skb)
467 goto out;
468
469 copied = skb->len;
470 if (copied > len) {
471 copied = len;
472 msg->msg_flags |= MSG_TRUNC;
473 }
474
475 if (skb_csum_unnecessary(skb)) {
476 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
477 } else if (msg->msg_flags&MSG_TRUNC) {
478 if (__skb_checksum_complete(skb))
479 goto csum_copy_err;
480 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
481 } else {
482 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
483 if (err == -EINVAL)
484 goto csum_copy_err;
485 }
486 if (err)
487 goto out_free;
488
489 /* Copy the address. */
490 if (sin6) {
491 sin6->sin6_family = AF_INET6;
492 sin6->sin6_port = 0;
493 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
494 sin6->sin6_flowinfo = 0;
495 sin6->sin6_scope_id = 0;
496 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
497 sin6->sin6_scope_id = IP6CB(skb)->iif;
498 }
499
500 sock_recv_timestamp(msg, sk, skb);
501
502 if (np->rxopt.all)
503 datagram_recv_ctl(sk, msg, skb);
504
505 err = copied;
506 if (flags & MSG_TRUNC)
507 err = skb->len;
508
509 out_free:
510 skb_free_datagram(sk, skb);
511 out:
512 return err;
513
514 csum_copy_err:
515 skb_kill_datagram(sk, skb, flags);
516
517 /* Error for blocking case is chosen to masquerade
518 as some normal condition.
519 */
520 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
521 atomic_inc(&sk->sk_drops);
522 goto out;
523 }
524
525 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
526 struct raw6_sock *rp)
527 {
528 struct sk_buff *skb;
529 int err = 0;
530 int offset;
531 int len;
532 int total_len;
533 __wsum tmp_csum;
534 __sum16 csum;
535
536 if (!rp->checksum)
537 goto send;
538
539 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
540 goto out;
541
542 offset = rp->offset;
543 total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) -
544 skb->data);
545 if (offset >= total_len - 1) {
546 err = -EINVAL;
547 ip6_flush_pending_frames(sk);
548 goto out;
549 }
550
551 /* should be check HW csum miyazawa */
552 if (skb_queue_len(&sk->sk_write_queue) == 1) {
553 /*
554 * Only one fragment on the socket.
555 */
556 tmp_csum = skb->csum;
557 } else {
558 struct sk_buff *csum_skb = NULL;
559 tmp_csum = 0;
560
561 skb_queue_walk(&sk->sk_write_queue, skb) {
562 tmp_csum = csum_add(tmp_csum, skb->csum);
563
564 if (csum_skb)
565 continue;
566
567 len = skb->len - skb_transport_offset(skb);
568 if (offset >= len) {
569 offset -= len;
570 continue;
571 }
572
573 csum_skb = skb;
574 }
575
576 skb = csum_skb;
577 }
578
579 offset += skb_transport_offset(skb);
580 if (skb_copy_bits(skb, offset, &csum, 2))
581 BUG();
582
583 /* in case cksum was not initialized */
584 if (unlikely(csum))
585 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
586
587 csum = csum_ipv6_magic(&fl->fl6_src,
588 &fl->fl6_dst,
589 total_len, fl->proto, tmp_csum);
590
591 if (csum == 0 && fl->proto == IPPROTO_UDP)
592 csum = CSUM_MANGLED_0;
593
594 if (skb_store_bits(skb, offset, &csum, 2))
595 BUG();
596
597 send:
598 err = ip6_push_pending_frames(sk);
599 out:
600 return err;
601 }
602
603 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
604 struct flowi *fl, struct rt6_info *rt,
605 unsigned int flags)
606 {
607 struct ipv6_pinfo *np = inet6_sk(sk);
608 struct ipv6hdr *iph;
609 struct sk_buff *skb;
610 int err;
611
612 if (length > rt->u.dst.dev->mtu) {
613 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu);
614 return -EMSGSIZE;
615 }
616 if (flags&MSG_PROBE)
617 goto out;
618
619 skb = sock_alloc_send_skb(sk,
620 length + LL_ALLOCATED_SPACE(rt->u.dst.dev) + 15,
621 flags & MSG_DONTWAIT, &err);
622 if (skb == NULL)
623 goto error;
624 skb_reserve(skb, LL_RESERVED_SPACE(rt->u.dst.dev));
625
626 skb->priority = sk->sk_priority;
627 skb->mark = sk->sk_mark;
628 skb->dst = dst_clone(&rt->u.dst);
629
630 skb_put(skb, length);
631 skb_reset_network_header(skb);
632 iph = ipv6_hdr(skb);
633
634 skb->ip_summed = CHECKSUM_NONE;
635
636 skb->transport_header = skb->network_header;
637 err = memcpy_fromiovecend((void *)iph, from, 0, length);
638 if (err)
639 goto error_fault;
640
641 IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
642 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
643 dst_output);
644 if (err > 0)
645 err = np->recverr ? net_xmit_errno(err) : 0;
646 if (err)
647 goto error;
648 out:
649 return 0;
650
651 error_fault:
652 err = -EFAULT;
653 kfree_skb(skb);
654 error:
655 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
656 return err;
657 }
658
659 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
660 {
661 struct iovec *iov;
662 u8 __user *type = NULL;
663 u8 __user *code = NULL;
664 u8 len = 0;
665 int probed = 0;
666 int i;
667
668 if (!msg->msg_iov)
669 return 0;
670
671 for (i = 0; i < msg->msg_iovlen; i++) {
672 iov = &msg->msg_iov[i];
673 if (!iov)
674 continue;
675
676 switch (fl->proto) {
677 case IPPROTO_ICMPV6:
678 /* check if one-byte field is readable or not. */
679 if (iov->iov_base && iov->iov_len < 1)
680 break;
681
682 if (!type) {
683 type = iov->iov_base;
684 /* check if code field is readable or not. */
685 if (iov->iov_len > 1)
686 code = type + 1;
687 } else if (!code)
688 code = iov->iov_base;
689
690 if (type && code) {
691 if (get_user(fl->fl_icmp_type, type) ||
692 get_user(fl->fl_icmp_code, code))
693 return -EFAULT;
694 probed = 1;
695 }
696 break;
697 case IPPROTO_MH:
698 if (iov->iov_base && iov->iov_len < 1)
699 break;
700 /* check if type field is readable or not. */
701 if (iov->iov_len > 2 - len) {
702 u8 __user *p = iov->iov_base;
703 if (get_user(fl->fl_mh_type, &p[2 - len]))
704 return -EFAULT;
705 probed = 1;
706 } else
707 len += iov->iov_len;
708
709 break;
710 default:
711 probed = 1;
712 break;
713 }
714 if (probed)
715 break;
716 }
717 return 0;
718 }
719
720 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
721 struct msghdr *msg, size_t len)
722 {
723 struct ipv6_txoptions opt_space;
724 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
725 struct in6_addr *daddr, *final_p = NULL, final;
726 struct inet_sock *inet = inet_sk(sk);
727 struct ipv6_pinfo *np = inet6_sk(sk);
728 struct raw6_sock *rp = raw6_sk(sk);
729 struct ipv6_txoptions *opt = NULL;
730 struct ip6_flowlabel *flowlabel = NULL;
731 struct dst_entry *dst = NULL;
732 struct flowi fl;
733 int addr_len = msg->msg_namelen;
734 int hlimit = -1;
735 int tclass = -1;
736 u16 proto;
737 int err;
738
739 /* Rough check on arithmetic overflow,
740 better check is made in ip6_append_data().
741 */
742 if (len > INT_MAX)
743 return -EMSGSIZE;
744
745 /* Mirror BSD error message compatibility */
746 if (msg->msg_flags & MSG_OOB)
747 return -EOPNOTSUPP;
748
749 /*
750 * Get and verify the address.
751 */
752 memset(&fl, 0, sizeof(fl));
753
754 fl.mark = sk->sk_mark;
755
756 if (sin6) {
757 if (addr_len < SIN6_LEN_RFC2133)
758 return -EINVAL;
759
760 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
761 return(-EAFNOSUPPORT);
762
763 /* port is the proto value [0..255] carried in nexthdr */
764 proto = ntohs(sin6->sin6_port);
765
766 if (!proto)
767 proto = inet->num;
768 else if (proto != inet->num)
769 return(-EINVAL);
770
771 if (proto > 255)
772 return(-EINVAL);
773
774 daddr = &sin6->sin6_addr;
775 if (np->sndflow) {
776 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
777 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
778 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
779 if (flowlabel == NULL)
780 return -EINVAL;
781 daddr = &flowlabel->dst;
782 }
783 }
784
785 /*
786 * Otherwise it will be difficult to maintain
787 * sk->sk_dst_cache.
788 */
789 if (sk->sk_state == TCP_ESTABLISHED &&
790 ipv6_addr_equal(daddr, &np->daddr))
791 daddr = &np->daddr;
792
793 if (addr_len >= sizeof(struct sockaddr_in6) &&
794 sin6->sin6_scope_id &&
795 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
796 fl.oif = sin6->sin6_scope_id;
797 } else {
798 if (sk->sk_state != TCP_ESTABLISHED)
799 return -EDESTADDRREQ;
800
801 proto = inet->num;
802 daddr = &np->daddr;
803 fl.fl6_flowlabel = np->flow_label;
804 }
805
806 if (fl.oif == 0)
807 fl.oif = sk->sk_bound_dev_if;
808
809 if (msg->msg_controllen) {
810 opt = &opt_space;
811 memset(opt, 0, sizeof(struct ipv6_txoptions));
812 opt->tot_len = sizeof(struct ipv6_txoptions);
813
814 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass);
815 if (err < 0) {
816 fl6_sock_release(flowlabel);
817 return err;
818 }
819 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
820 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
821 if (flowlabel == NULL)
822 return -EINVAL;
823 }
824 if (!(opt->opt_nflen|opt->opt_flen))
825 opt = NULL;
826 }
827 if (opt == NULL)
828 opt = np->opt;
829 if (flowlabel)
830 opt = fl6_merge_options(&opt_space, flowlabel, opt);
831 opt = ipv6_fixup_options(&opt_space, opt);
832
833 fl.proto = proto;
834 err = rawv6_probe_proto_opt(&fl, msg);
835 if (err)
836 goto out;
837
838 if (!ipv6_addr_any(daddr))
839 ipv6_addr_copy(&fl.fl6_dst, daddr);
840 else
841 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
842 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
843 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
844
845 /* merge ip6_build_xmit from ip6_output */
846 if (opt && opt->srcrt) {
847 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
848 ipv6_addr_copy(&final, &fl.fl6_dst);
849 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
850 final_p = &final;
851 }
852
853 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
854 fl.oif = np->mcast_oif;
855 security_sk_classify_flow(sk, &fl);
856
857 err = ip6_dst_lookup(sk, &dst, &fl);
858 if (err)
859 goto out;
860 if (final_p)
861 ipv6_addr_copy(&fl.fl6_dst, final_p);
862
863 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
864 if (err < 0) {
865 if (err == -EREMOTE)
866 err = ip6_dst_blackhole(sk, &dst, &fl);
867 if (err < 0)
868 goto out;
869 }
870
871 if (hlimit < 0) {
872 if (ipv6_addr_is_multicast(&fl.fl6_dst))
873 hlimit = np->mcast_hops;
874 else
875 hlimit = np->hop_limit;
876 if (hlimit < 0)
877 hlimit = ip6_dst_hoplimit(dst);
878 }
879
880 if (tclass < 0) {
881 tclass = np->tclass;
882 if (tclass < 0)
883 tclass = 0;
884 }
885
886 if (msg->msg_flags&MSG_CONFIRM)
887 goto do_confirm;
888
889 back_from_confirm:
890 if (inet->hdrincl) {
891 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags);
892 } else {
893 lock_sock(sk);
894 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
895 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst,
896 msg->msg_flags);
897
898 if (err)
899 ip6_flush_pending_frames(sk);
900 else if (!(msg->msg_flags & MSG_MORE))
901 err = rawv6_push_pending_frames(sk, &fl, rp);
902 release_sock(sk);
903 }
904 done:
905 dst_release(dst);
906 out:
907 fl6_sock_release(flowlabel);
908 return err<0?err:len;
909 do_confirm:
910 dst_confirm(dst);
911 if (!(msg->msg_flags & MSG_PROBE) || len)
912 goto back_from_confirm;
913 err = 0;
914 goto done;
915 }
916
917 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
918 char __user *optval, int optlen)
919 {
920 switch (optname) {
921 case ICMPV6_FILTER:
922 if (optlen > sizeof(struct icmp6_filter))
923 optlen = sizeof(struct icmp6_filter);
924 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
925 return -EFAULT;
926 return 0;
927 default:
928 return -ENOPROTOOPT;
929 }
930
931 return 0;
932 }
933
934 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
935 char __user *optval, int __user *optlen)
936 {
937 int len;
938
939 switch (optname) {
940 case ICMPV6_FILTER:
941 if (get_user(len, optlen))
942 return -EFAULT;
943 if (len < 0)
944 return -EINVAL;
945 if (len > sizeof(struct icmp6_filter))
946 len = sizeof(struct icmp6_filter);
947 if (put_user(len, optlen))
948 return -EFAULT;
949 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
950 return -EFAULT;
951 return 0;
952 default:
953 return -ENOPROTOOPT;
954 }
955
956 return 0;
957 }
958
959
960 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
961 char __user *optval, int optlen)
962 {
963 struct raw6_sock *rp = raw6_sk(sk);
964 int val;
965
966 if (get_user(val, (int __user *)optval))
967 return -EFAULT;
968
969 switch (optname) {
970 case IPV6_CHECKSUM:
971 if (inet_sk(sk)->num == IPPROTO_ICMPV6 &&
972 level == IPPROTO_IPV6) {
973 /*
974 * RFC3542 tells that IPV6_CHECKSUM socket
975 * option in the IPPROTO_IPV6 level is not
976 * allowed on ICMPv6 sockets.
977 * If you want to set it, use IPPROTO_RAW
978 * level IPV6_CHECKSUM socket option
979 * (Linux extension).
980 */
981 return -EINVAL;
982 }
983
984 /* You may get strange result with a positive odd offset;
985 RFC2292bis agrees with me. */
986 if (val > 0 && (val&1))
987 return(-EINVAL);
988 if (val < 0) {
989 rp->checksum = 0;
990 } else {
991 rp->checksum = 1;
992 rp->offset = val;
993 }
994
995 return 0;
996 break;
997
998 default:
999 return(-ENOPROTOOPT);
1000 }
1001 }
1002
1003 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1004 char __user *optval, int optlen)
1005 {
1006 switch(level) {
1007 case SOL_RAW:
1008 break;
1009
1010 case SOL_ICMPV6:
1011 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1012 return -EOPNOTSUPP;
1013 return rawv6_seticmpfilter(sk, level, optname, optval,
1014 optlen);
1015 case SOL_IPV6:
1016 if (optname == IPV6_CHECKSUM)
1017 break;
1018 default:
1019 return ipv6_setsockopt(sk, level, optname, optval,
1020 optlen);
1021 }
1022
1023 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1024 }
1025
1026 #ifdef CONFIG_COMPAT
1027 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1028 char __user *optval, int optlen)
1029 {
1030 switch (level) {
1031 case SOL_RAW:
1032 break;
1033 case SOL_ICMPV6:
1034 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1035 return -EOPNOTSUPP;
1036 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1037 case SOL_IPV6:
1038 if (optname == IPV6_CHECKSUM)
1039 break;
1040 default:
1041 return compat_ipv6_setsockopt(sk, level, optname,
1042 optval, optlen);
1043 }
1044 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1045 }
1046 #endif
1047
1048 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1049 char __user *optval, int __user *optlen)
1050 {
1051 struct raw6_sock *rp = raw6_sk(sk);
1052 int val, len;
1053
1054 if (get_user(len,optlen))
1055 return -EFAULT;
1056
1057 switch (optname) {
1058 case IPV6_CHECKSUM:
1059 /*
1060 * We allow getsockopt() for IPPROTO_IPV6-level
1061 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1062 * since RFC3542 is silent about it.
1063 */
1064 if (rp->checksum == 0)
1065 val = -1;
1066 else
1067 val = rp->offset;
1068 break;
1069
1070 default:
1071 return -ENOPROTOOPT;
1072 }
1073
1074 len = min_t(unsigned int, sizeof(int), len);
1075
1076 if (put_user(len, optlen))
1077 return -EFAULT;
1078 if (copy_to_user(optval,&val,len))
1079 return -EFAULT;
1080 return 0;
1081 }
1082
1083 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1084 char __user *optval, int __user *optlen)
1085 {
1086 switch(level) {
1087 case SOL_RAW:
1088 break;
1089
1090 case SOL_ICMPV6:
1091 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1092 return -EOPNOTSUPP;
1093 return rawv6_geticmpfilter(sk, level, optname, optval,
1094 optlen);
1095 case SOL_IPV6:
1096 if (optname == IPV6_CHECKSUM)
1097 break;
1098 default:
1099 return ipv6_getsockopt(sk, level, optname, optval,
1100 optlen);
1101 }
1102
1103 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1104 }
1105
1106 #ifdef CONFIG_COMPAT
1107 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1108 char __user *optval, int __user *optlen)
1109 {
1110 switch (level) {
1111 case SOL_RAW:
1112 break;
1113 case SOL_ICMPV6:
1114 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1115 return -EOPNOTSUPP;
1116 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1117 case SOL_IPV6:
1118 if (optname == IPV6_CHECKSUM)
1119 break;
1120 default:
1121 return compat_ipv6_getsockopt(sk, level, optname,
1122 optval, optlen);
1123 }
1124 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1125 }
1126 #endif
1127
1128 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1129 {
1130 switch(cmd) {
1131 case SIOCOUTQ:
1132 {
1133 int amount = atomic_read(&sk->sk_wmem_alloc);
1134 return put_user(amount, (int __user *)arg);
1135 }
1136 case SIOCINQ:
1137 {
1138 struct sk_buff *skb;
1139 int amount = 0;
1140
1141 spin_lock_bh(&sk->sk_receive_queue.lock);
1142 skb = skb_peek(&sk->sk_receive_queue);
1143 if (skb != NULL)
1144 amount = skb->tail - skb->transport_header;
1145 spin_unlock_bh(&sk->sk_receive_queue.lock);
1146 return put_user(amount, (int __user *)arg);
1147 }
1148
1149 default:
1150 #ifdef CONFIG_IPV6_MROUTE
1151 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1152 #else
1153 return -ENOIOCTLCMD;
1154 #endif
1155 }
1156 }
1157
1158 static void rawv6_close(struct sock *sk, long timeout)
1159 {
1160 if (inet_sk(sk)->num == IPPROTO_RAW)
1161 ip6_ra_control(sk, -1);
1162 ip6mr_sk_done(sk);
1163 sk_common_release(sk);
1164 }
1165
1166 static void raw6_destroy(struct sock *sk)
1167 {
1168 lock_sock(sk);
1169 ip6_flush_pending_frames(sk);
1170 release_sock(sk);
1171
1172 inet6_destroy_sock(sk);
1173 }
1174
1175 static int rawv6_init_sk(struct sock *sk)
1176 {
1177 struct raw6_sock *rp = raw6_sk(sk);
1178
1179 switch (inet_sk(sk)->num) {
1180 case IPPROTO_ICMPV6:
1181 rp->checksum = 1;
1182 rp->offset = 2;
1183 break;
1184 case IPPROTO_MH:
1185 rp->checksum = 1;
1186 rp->offset = 4;
1187 break;
1188 default:
1189 break;
1190 }
1191 return(0);
1192 }
1193
1194 struct proto rawv6_prot = {
1195 .name = "RAWv6",
1196 .owner = THIS_MODULE,
1197 .close = rawv6_close,
1198 .destroy = raw6_destroy,
1199 .connect = ip6_datagram_connect,
1200 .disconnect = udp_disconnect,
1201 .ioctl = rawv6_ioctl,
1202 .init = rawv6_init_sk,
1203 .setsockopt = rawv6_setsockopt,
1204 .getsockopt = rawv6_getsockopt,
1205 .sendmsg = rawv6_sendmsg,
1206 .recvmsg = rawv6_recvmsg,
1207 .bind = rawv6_bind,
1208 .backlog_rcv = rawv6_rcv_skb,
1209 .hash = raw_hash_sk,
1210 .unhash = raw_unhash_sk,
1211 .obj_size = sizeof(struct raw6_sock),
1212 .h.raw_hash = &raw_v6_hashinfo,
1213 #ifdef CONFIG_COMPAT
1214 .compat_setsockopt = compat_rawv6_setsockopt,
1215 .compat_getsockopt = compat_rawv6_getsockopt,
1216 #endif
1217 };
1218
1219 #ifdef CONFIG_PROC_FS
1220 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1221 {
1222 struct ipv6_pinfo *np = inet6_sk(sp);
1223 struct in6_addr *dest, *src;
1224 __u16 destp, srcp;
1225
1226 dest = &np->daddr;
1227 src = &np->rcv_saddr;
1228 destp = 0;
1229 srcp = inet_sk(sp)->num;
1230 seq_printf(seq,
1231 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1232 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1233 i,
1234 src->s6_addr32[0], src->s6_addr32[1],
1235 src->s6_addr32[2], src->s6_addr32[3], srcp,
1236 dest->s6_addr32[0], dest->s6_addr32[1],
1237 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1238 sp->sk_state,
1239 atomic_read(&sp->sk_wmem_alloc),
1240 atomic_read(&sp->sk_rmem_alloc),
1241 0, 0L, 0,
1242 sock_i_uid(sp), 0,
1243 sock_i_ino(sp),
1244 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1245 }
1246
1247 static int raw6_seq_show(struct seq_file *seq, void *v)
1248 {
1249 if (v == SEQ_START_TOKEN)
1250 seq_printf(seq,
1251 " sl "
1252 "local_address "
1253 "remote_address "
1254 "st tx_queue rx_queue tr tm->when retrnsmt"
1255 " uid timeout inode ref pointer drops\n");
1256 else
1257 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1258 return 0;
1259 }
1260
1261 static const struct seq_operations raw6_seq_ops = {
1262 .start = raw_seq_start,
1263 .next = raw_seq_next,
1264 .stop = raw_seq_stop,
1265 .show = raw6_seq_show,
1266 };
1267
1268 static int raw6_seq_open(struct inode *inode, struct file *file)
1269 {
1270 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1271 }
1272
1273 static const struct file_operations raw6_seq_fops = {
1274 .owner = THIS_MODULE,
1275 .open = raw6_seq_open,
1276 .read = seq_read,
1277 .llseek = seq_lseek,
1278 .release = seq_release_net,
1279 };
1280
1281 static int raw6_init_net(struct net *net)
1282 {
1283 if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops))
1284 return -ENOMEM;
1285
1286 return 0;
1287 }
1288
1289 static void raw6_exit_net(struct net *net)
1290 {
1291 proc_net_remove(net, "raw6");
1292 }
1293
1294 static struct pernet_operations raw6_net_ops = {
1295 .init = raw6_init_net,
1296 .exit = raw6_exit_net,
1297 };
1298
1299 int __init raw6_proc_init(void)
1300 {
1301 return register_pernet_subsys(&raw6_net_ops);
1302 }
1303
1304 void raw6_proc_exit(void)
1305 {
1306 unregister_pernet_subsys(&raw6_net_ops);
1307 }
1308 #endif /* CONFIG_PROC_FS */
1309
1310 /* Same as inet6_dgram_ops, sans udp_poll. */
1311 static const struct proto_ops inet6_sockraw_ops = {
1312 .family = PF_INET6,
1313 .owner = THIS_MODULE,
1314 .release = inet6_release,
1315 .bind = inet6_bind,
1316 .connect = inet_dgram_connect, /* ok */
1317 .socketpair = sock_no_socketpair, /* a do nothing */
1318 .accept = sock_no_accept, /* a do nothing */
1319 .getname = inet6_getname,
1320 .poll = datagram_poll, /* ok */
1321 .ioctl = inet6_ioctl, /* must change */
1322 .listen = sock_no_listen, /* ok */
1323 .shutdown = inet_shutdown, /* ok */
1324 .setsockopt = sock_common_setsockopt, /* ok */
1325 .getsockopt = sock_common_getsockopt, /* ok */
1326 .sendmsg = inet_sendmsg, /* ok */
1327 .recvmsg = sock_common_recvmsg, /* ok */
1328 .mmap = sock_no_mmap,
1329 .sendpage = sock_no_sendpage,
1330 #ifdef CONFIG_COMPAT
1331 .compat_setsockopt = compat_sock_common_setsockopt,
1332 .compat_getsockopt = compat_sock_common_getsockopt,
1333 #endif
1334 };
1335
1336 static struct inet_protosw rawv6_protosw = {
1337 .type = SOCK_RAW,
1338 .protocol = IPPROTO_IP, /* wild card */
1339 .prot = &rawv6_prot,
1340 .ops = &inet6_sockraw_ops,
1341 .capability = CAP_NET_RAW,
1342 .no_check = UDP_CSUM_DEFAULT,
1343 .flags = INET_PROTOSW_REUSE,
1344 };
1345
1346 int __init rawv6_init(void)
1347 {
1348 int ret;
1349
1350 ret = inet6_register_protosw(&rawv6_protosw);
1351 if (ret)
1352 goto out;
1353 out:
1354 return ret;
1355 }
1356
1357 void rawv6_exit(void)
1358 {
1359 inet6_unregister_protosw(&rawv6_protosw);
1360 }
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