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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / net / ipv6 / raw.c
blobeb1d37d0dcbb626396d8340dd9cb758a10646f30
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/slab.h>
25 #include <linux/sockios.h>
26 #include <linux/net.h>
27 #include <linux/in6.h>
28 #include <linux/netdevice.h>
29 #include <linux/if_arp.h>
30 #include <linux/icmpv6.h>
31 #include <linux/netfilter.h>
32 #include <linux/netfilter_ipv6.h>
33 #include <linux/skbuff.h>
34 #include <asm/uaccess.h>
35 #include <asm/ioctls.h>
36
37 #include <net/net_namespace.h>
38 #include <net/ip.h>
39 #include <net/sock.h>
40 #include <net/snmp.h>
41
42 #include <net/ipv6.h>
43 #include <net/ndisc.h>
44 #include <net/protocol.h>
45 #include <net/ip6_route.h>
46 #include <net/ip6_checksum.h>
47 #include <net/addrconf.h>
48 #include <net/transp_v6.h>
49 #include <net/udp.h>
50 #include <net/inet_common.h>
51 #include <net/tcp_states.h>
52 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
53 #include <net/mip6.h>
54 #endif
55 #include <linux/mroute6.h>
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)->inet_num == num) {
77 struct ipv6_pinfo *np = inet6_sk(sk);
78
79 if (!net_eq(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 if (sk == NULL)
172 goto out;
173
174 net = dev_net(skb->dev);
175 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
176
177 while (sk) {
178 int filtered;
179
180 delivered = 1;
181 switch (nexthdr) {
182 case IPPROTO_ICMPV6:
183 filtered = icmpv6_filter(sk, skb);
184 break;
185
186 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
187 case IPPROTO_MH:
188 {
189 int (*filter)(struct sock *sock, struct sk_buff *skb);
190
191 filter = rcu_dereference(mh_filter);
192 filtered = filter ? filter(sk, skb) : 0;
193 break;
194 }
195 #endif
196 default:
197 filtered = 0;
198 break;
199 }
200
201 if (filtered < 0)
202 break;
203 if (filtered == 0) {
204 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
205
206 /* Not releasing hash table! */
207 if (clone) {
208 nf_reset(clone);
209 rawv6_rcv(sk, clone);
210 }
211 }
212 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
213 IP6CB(skb)->iif);
214 }
215 out:
216 read_unlock(&raw_v6_hashinfo.lock);
217 return delivered;
218 }
219
220 int raw6_local_deliver(struct sk_buff *skb, int nexthdr)
221 {
222 struct sock *raw_sk;
223
224 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (MAX_INET_PROTOS - 1)]);
225 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
226 raw_sk = NULL;
227
228 return raw_sk != NULL;
229 }
230
231 /* This cleans up af_inet6 a bit. -DaveM */
232 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
233 {
234 struct inet_sock *inet = inet_sk(sk);
235 struct ipv6_pinfo *np = inet6_sk(sk);
236 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
237 __be32 v4addr = 0;
238 int addr_type;
239 int err;
240
241 if (addr_len < SIN6_LEN_RFC2133)
242 return -EINVAL;
243 addr_type = ipv6_addr_type(&addr->sin6_addr);
244
245 /* Raw sockets are IPv6 only */
246 if (addr_type == IPV6_ADDR_MAPPED)
247 return -EADDRNOTAVAIL;
248
249 lock_sock(sk);
250
251 err = -EINVAL;
252 if (sk->sk_state != TCP_CLOSE)
253 goto out;
254
255 rcu_read_lock();
256 /* Check if the address belongs to the host. */
257 if (addr_type != IPV6_ADDR_ANY) {
258 struct net_device *dev = NULL;
259
260 if (addr_type & IPV6_ADDR_LINKLOCAL) {
261 if (addr_len >= sizeof(struct sockaddr_in6) &&
262 addr->sin6_scope_id) {
263 /* Override any existing binding, if another
264 * one is supplied by user.
265 */
266 sk->sk_bound_dev_if = addr->sin6_scope_id;
267 }
268
269 /* Binding to link-local address requires an interface */
270 if (!sk->sk_bound_dev_if)
271 goto out_unlock;
272
273 err = -ENODEV;
274 dev = dev_get_by_index_rcu(sock_net(sk),
275 sk->sk_bound_dev_if);
276 if (!dev)
277 goto out_unlock;
278 }
279
280 /* ipv4 addr of the socket is invalid. Only the
281 * unspecified and mapped address have a v4 equivalent.
282 */
283 v4addr = LOOPBACK4_IPV6;
284 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
285 err = -EADDRNOTAVAIL;
286 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
287 dev, 0)) {
288 goto out_unlock;
289 }
290 }
291 }
292
293 inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
294 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
295 if (!(addr_type & IPV6_ADDR_MULTICAST))
296 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
297 err = 0;
298 out_unlock:
299 rcu_read_unlock();
300 out:
301 release_sock(sk);
302 return err;
303 }
304
305 static void rawv6_err(struct sock *sk, struct sk_buff *skb,
306 struct inet6_skb_parm *opt,
307 u8 type, u8 code, int offset, __be32 info)
308 {
309 struct inet_sock *inet = inet_sk(sk);
310 struct ipv6_pinfo *np = inet6_sk(sk);
311 int err;
312 int harderr;
313
314 /* Report error on raw socket, if:
315 1. User requested recverr.
316 2. Socket is connected (otherwise the error indication
317 is useless without recverr and error is hard.
318 */
319 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
320 return;
321
322 harderr = icmpv6_err_convert(type, code, &err);
323 if (type == ICMPV6_PKT_TOOBIG)
324 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
325
326 if (np->recverr) {
327 u8 *payload = skb->data;
328 if (!inet->hdrincl)
329 payload += offset;
330 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
331 }
332
333 if (np->recverr || harderr) {
334 sk->sk_err = err;
335 sk->sk_error_report(sk);
336 }
337 }
338
339 void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
340 u8 type, u8 code, int inner_offset, __be32 info)
341 {
342 struct sock *sk;
343 int hash;
344 struct in6_addr *saddr, *daddr;
345 struct net *net;
346
347 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
348
349 read_lock(&raw_v6_hashinfo.lock);
350 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
351 if (sk != NULL) {
352 /* Note: ipv6_hdr(skb) != skb->data */
353 struct ipv6hdr *ip6h = (struct ipv6hdr *)skb->data;
354 saddr = &ip6h->saddr;
355 daddr = &ip6h->daddr;
356 net = dev_net(skb->dev);
357
358 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
359 IP6CB(skb)->iif))) {
360 rawv6_err(sk, skb, NULL, type, code,
361 inner_offset, info);
362 sk = sk_next(sk);
363 }
364 }
365 read_unlock(&raw_v6_hashinfo.lock);
366 }
367
368 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
369 {
370 if ((raw6_sk(sk)->checksum || sk->sk_filter) &&
371 skb_checksum_complete(skb)) {
372 atomic_inc(&sk->sk_drops);
373 kfree_skb(skb);
374 return NET_RX_DROP;
375 }
376
377 /* Charge it to the socket. */
378 if (ip_queue_rcv_skb(sk, skb) < 0) {
379 kfree_skb(skb);
380 return NET_RX_DROP;
381 }
382
383 return 0;
384 }
385
386 /*
387 * This is next to useless...
388 * if we demultiplex in network layer we don't need the extra call
389 * just to queue the skb...
390 * maybe we could have the network decide upon a hint if it
391 * should call raw_rcv for demultiplexing
392 */
393 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
394 {
395 struct inet_sock *inet = inet_sk(sk);
396 struct raw6_sock *rp = raw6_sk(sk);
397
398 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
399 atomic_inc(&sk->sk_drops);
400 kfree_skb(skb);
401 return NET_RX_DROP;
402 }
403
404 if (!rp->checksum)
405 skb->ip_summed = CHECKSUM_UNNECESSARY;
406
407 if (skb->ip_summed == CHECKSUM_COMPLETE) {
408 skb_postpull_rcsum(skb, skb_network_header(skb),
409 skb_network_header_len(skb));
410 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
411 &ipv6_hdr(skb)->daddr,
412 skb->len, inet->inet_num, skb->csum))
413 skb->ip_summed = CHECKSUM_UNNECESSARY;
414 }
415 if (!skb_csum_unnecessary(skb))
416 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
417 &ipv6_hdr(skb)->daddr,
418 skb->len,
419 inet->inet_num, 0));
420
421 if (inet->hdrincl) {
422 if (skb_checksum_complete(skb)) {
423 atomic_inc(&sk->sk_drops);
424 kfree_skb(skb);
425 return NET_RX_DROP;
426 }
427 }
428
429 rawv6_rcv_skb(sk, skb);
430 return 0;
431 }
432
433
434 /*
435 * This should be easy, if there is something there
436 * we return it, otherwise we block.
437 */
438
439 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
440 struct msghdr *msg, size_t len,
441 int noblock, int flags, int *addr_len)
442 {
443 struct ipv6_pinfo *np = inet6_sk(sk);
444 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
445 struct sk_buff *skb;
446 size_t copied;
447 int err;
448
449 if (flags & MSG_OOB)
450 return -EOPNOTSUPP;
451
452 if (addr_len)
453 *addr_len=sizeof(*sin6);
454
455 if (flags & MSG_ERRQUEUE)
456 return ipv6_recv_error(sk, msg, len);
457
458 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
459 return ipv6_recv_rxpmtu(sk, msg, len);
460
461 skb = skb_recv_datagram(sk, flags, noblock, &err);
462 if (!skb)
463 goto out;
464
465 copied = skb->len;
466 if (copied > len) {
467 copied = len;
468 msg->msg_flags |= MSG_TRUNC;
469 }
470
471 if (skb_csum_unnecessary(skb)) {
472 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
473 } else if (msg->msg_flags&MSG_TRUNC) {
474 if (__skb_checksum_complete(skb))
475 goto csum_copy_err;
476 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
477 } else {
478 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
479 if (err == -EINVAL)
480 goto csum_copy_err;
481 }
482 if (err)
483 goto out_free;
484
485 /* Copy the address. */
486 if (sin6) {
487 sin6->sin6_family = AF_INET6;
488 sin6->sin6_port = 0;
489 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
490 sin6->sin6_flowinfo = 0;
491 sin6->sin6_scope_id = 0;
492 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
493 sin6->sin6_scope_id = IP6CB(skb)->iif;
494 }
495
496 sock_recv_ts_and_drops(msg, sk, skb);
497
498 if (np->rxopt.all)
499 datagram_recv_ctl(sk, msg, skb);
500
501 err = copied;
502 if (flags & MSG_TRUNC)
503 err = skb->len;
504
505 out_free:
506 skb_free_datagram(sk, skb);
507 out:
508 return err;
509
510 csum_copy_err:
511 skb_kill_datagram(sk, skb, flags);
512
513 /* Error for blocking case is chosen to masquerade
514 as some normal condition.
515 */
516 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
517 goto out;
518 }
519
520 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
521 struct raw6_sock *rp)
522 {
523 struct sk_buff *skb;
524 int err = 0;
525 int offset;
526 int len;
527 int total_len;
528 __wsum tmp_csum;
529 __sum16 csum;
530
531 if (!rp->checksum)
532 goto send;
533
534 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
535 goto out;
536
537 offset = rp->offset;
538 total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) -
539 skb->data);
540 if (offset >= total_len - 1) {
541 err = -EINVAL;
542 ip6_flush_pending_frames(sk);
543 goto out;
544 }
545
546 /* should be check HW csum miyazawa */
547 if (skb_queue_len(&sk->sk_write_queue) == 1) {
548 /*
549 * Only one fragment on the socket.
550 */
551 tmp_csum = skb->csum;
552 } else {
553 struct sk_buff *csum_skb = NULL;
554 tmp_csum = 0;
555
556 skb_queue_walk(&sk->sk_write_queue, skb) {
557 tmp_csum = csum_add(tmp_csum, skb->csum);
558
559 if (csum_skb)
560 continue;
561
562 len = skb->len - skb_transport_offset(skb);
563 if (offset >= len) {
564 offset -= len;
565 continue;
566 }
567
568 csum_skb = skb;
569 }
570
571 skb = csum_skb;
572 }
573
574 offset += skb_transport_offset(skb);
575 if (skb_copy_bits(skb, offset, &csum, 2))
576 BUG();
577
578 /* in case cksum was not initialized */
579 if (unlikely(csum))
580 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
581
582 csum = csum_ipv6_magic(&fl->fl6_src,
583 &fl->fl6_dst,
584 total_len, fl->proto, tmp_csum);
585
586 if (csum == 0 && fl->proto == IPPROTO_UDP)
587 csum = CSUM_MANGLED_0;
588
589 if (skb_store_bits(skb, offset, &csum, 2))
590 BUG();
591
592 send:
593 err = ip6_push_pending_frames(sk);
594 out:
595 return err;
596 }
597
598 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
599 struct flowi *fl, struct dst_entry **dstp,
600 unsigned int flags)
601 {
602 struct ipv6_pinfo *np = inet6_sk(sk);
603 struct ipv6hdr *iph;
604 struct sk_buff *skb;
605 int err;
606 struct rt6_info *rt = (struct rt6_info *)*dstp;
607
608 if (length > rt->dst.dev->mtu) {
609 ipv6_local_error(sk, EMSGSIZE, fl, rt->dst.dev->mtu);
610 return -EMSGSIZE;
611 }
612 if (flags&MSG_PROBE)
613 goto out;
614
615 skb = sock_alloc_send_skb(sk,
616 length + LL_ALLOCATED_SPACE(rt->dst.dev) + 15,
617 flags & MSG_DONTWAIT, &err);
618 if (skb == NULL)
619 goto error;
620 skb_reserve(skb, LL_RESERVED_SPACE(rt->dst.dev));
621
622 skb->priority = sk->sk_priority;
623 skb->mark = sk->sk_mark;
624 skb_dst_set(skb, &rt->dst);
625 *dstp = NULL;
626
627 skb_put(skb, length);
628 skb_reset_network_header(skb);
629 iph = ipv6_hdr(skb);
630
631 skb->ip_summed = CHECKSUM_NONE;
632
633 skb->transport_header = skb->network_header;
634 err = memcpy_fromiovecend((void *)iph, from, 0, length);
635 if (err)
636 goto error_fault;
637
638 IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
639 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
640 rt->dst.dev, dst_output);
641 if (err > 0)
642 err = net_xmit_errno(err);
643 if (err)
644 goto error;
645 out:
646 return 0;
647
648 error_fault:
649 err = -EFAULT;
650 kfree_skb(skb);
651 error:
652 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
653 if (err == -ENOBUFS && !np->recverr)
654 err = 0;
655 return err;
656 }
657
658 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
659 {
660 struct iovec *iov;
661 u8 __user *type = NULL;
662 u8 __user *code = NULL;
663 u8 len = 0;
664 int probed = 0;
665 int i;
666
667 if (!msg->msg_iov)
668 return 0;
669
670 for (i = 0; i < msg->msg_iovlen; i++) {
671 iov = &msg->msg_iov[i];
672 if (!iov)
673 continue;
674
675 switch (fl->proto) {
676 case IPPROTO_ICMPV6:
677 /* check if one-byte field is readable or not. */
678 if (iov->iov_base && iov->iov_len < 1)
679 break;
680
681 if (!type) {
682 type = iov->iov_base;
683 /* check if code field is readable or not. */
684 if (iov->iov_len > 1)
685 code = type + 1;
686 } else if (!code)
687 code = iov->iov_base;
688
689 if (type && code) {
690 if (get_user(fl->fl_icmp_type, type) ||
691 get_user(fl->fl_icmp_code, code))
692 return -EFAULT;
693 probed = 1;
694 }
695 break;
696 case IPPROTO_MH:
697 if (iov->iov_base && iov->iov_len < 1)
698 break;
699 /* check if type field is readable or not. */
700 if (iov->iov_len > 2 - len) {
701 u8 __user *p = iov->iov_base;
702 if (get_user(fl->fl_mh_type, &p[2 - len]))
703 return -EFAULT;
704 probed = 1;
705 } else
706 len += iov->iov_len;
707
708 break;
709 default:
710 probed = 1;
711 break;
712 }
713 if (probed)
714 break;
715 }
716 return 0;
717 }
718
719 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
720 struct msghdr *msg, size_t len)
721 {
722 struct ipv6_txoptions opt_space;
723 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
724 struct in6_addr *daddr, *final_p, final;
725 struct inet_sock *inet = inet_sk(sk);
726 struct ipv6_pinfo *np = inet6_sk(sk);
727 struct raw6_sock *rp = raw6_sk(sk);
728 struct ipv6_txoptions *opt = NULL;
729 struct ip6_flowlabel *flowlabel = NULL;
730 struct dst_entry *dst = NULL;
731 struct flowi fl;
732 int addr_len = msg->msg_namelen;
733 int hlimit = -1;
734 int tclass = -1;
735 int dontfrag = -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->inet_num;
768 else if (proto != inet->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->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,
815 &tclass, &dontfrag);
816 if (err < 0) {
817 fl6_sock_release(flowlabel);
818 return err;
819 }
820 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
821 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
822 if (flowlabel == NULL)
823 return -EINVAL;
824 }
825 if (!(opt->opt_nflen|opt->opt_flen))
826 opt = NULL;
827 }
828 if (opt == NULL)
829 opt = np->opt;
830 if (flowlabel)
831 opt = fl6_merge_options(&opt_space, flowlabel, opt);
832 opt = ipv6_fixup_options(&opt_space, opt);
833
834 fl.proto = proto;
835 err = rawv6_probe_proto_opt(&fl, msg);
836 if (err)
837 goto out;
838
839 if (!ipv6_addr_any(daddr))
840 ipv6_addr_copy(&fl.fl6_dst, daddr);
841 else
842 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
843 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
844 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
845
846 final_p = fl6_update_dst(&fl, opt, &final);
847
848 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
849 fl.oif = np->mcast_oif;
850 security_sk_classify_flow(sk, &fl);
851
852 err = ip6_dst_lookup(sk, &dst, &fl);
853 if (err)
854 goto out;
855 if (final_p)
856 ipv6_addr_copy(&fl.fl6_dst, final_p);
857
858 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
859 if (err < 0) {
860 if (err == -EREMOTE)
861 err = ip6_dst_blackhole(sk, &dst, &fl);
862 if (err < 0)
863 goto out;
864 }
865
866 if (hlimit < 0) {
867 if (ipv6_addr_is_multicast(&fl.fl6_dst))
868 hlimit = np->mcast_hops;
869 else
870 hlimit = np->hop_limit;
871 if (hlimit < 0)
872 hlimit = ip6_dst_hoplimit(dst);
873 }
874
875 if (tclass < 0)
876 tclass = np->tclass;
877
878 if (dontfrag < 0)
879 dontfrag = np->dontfrag;
880
881 if (msg->msg_flags&MSG_CONFIRM)
882 goto do_confirm;
883
884 back_from_confirm:
885 if (inet->hdrincl)
886 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, &dst, msg->msg_flags);
887 else {
888 lock_sock(sk);
889 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
890 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst,
891 msg->msg_flags, dontfrag);
892
893 if (err)
894 ip6_flush_pending_frames(sk);
895 else if (!(msg->msg_flags & MSG_MORE))
896 err = rawv6_push_pending_frames(sk, &fl, rp);
897 release_sock(sk);
898 }
899 done:
900 dst_release(dst);
901 out:
902 fl6_sock_release(flowlabel);
903 return err<0?err:len;
904 do_confirm:
905 dst_confirm(dst);
906 if (!(msg->msg_flags & MSG_PROBE) || len)
907 goto back_from_confirm;
908 err = 0;
909 goto done;
910 }
911
912 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
913 char __user *optval, int optlen)
914 {
915 switch (optname) {
916 case ICMPV6_FILTER:
917 if (optlen > sizeof(struct icmp6_filter))
918 optlen = sizeof(struct icmp6_filter);
919 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
920 return -EFAULT;
921 return 0;
922 default:
923 return -ENOPROTOOPT;
924 }
925
926 return 0;
927 }
928
929 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
930 char __user *optval, int __user *optlen)
931 {
932 int len;
933
934 switch (optname) {
935 case ICMPV6_FILTER:
936 if (get_user(len, optlen))
937 return -EFAULT;
938 if (len < 0)
939 return -EINVAL;
940 if (len > sizeof(struct icmp6_filter))
941 len = sizeof(struct icmp6_filter);
942 if (put_user(len, optlen))
943 return -EFAULT;
944 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
945 return -EFAULT;
946 return 0;
947 default:
948 return -ENOPROTOOPT;
949 }
950
951 return 0;
952 }
953
954
955 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
956 char __user *optval, unsigned int optlen)
957 {
958 struct raw6_sock *rp = raw6_sk(sk);
959 int val;
960
961 if (get_user(val, (int __user *)optval))
962 return -EFAULT;
963
964 switch (optname) {
965 case IPV6_CHECKSUM:
966 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
967 level == IPPROTO_IPV6) {
968 /*
969 * RFC3542 tells that IPV6_CHECKSUM socket
970 * option in the IPPROTO_IPV6 level is not
971 * allowed on ICMPv6 sockets.
972 * If you want to set it, use IPPROTO_RAW
973 * level IPV6_CHECKSUM socket option
974 * (Linux extension).
975 */
976 return -EINVAL;
977 }
978
979 /* You may get strange result with a positive odd offset;
980 RFC2292bis agrees with me. */
981 if (val > 0 && (val&1))
982 return(-EINVAL);
983 if (val < 0) {
984 rp->checksum = 0;
985 } else {
986 rp->checksum = 1;
987 rp->offset = val;
988 }
989
990 return 0;
991 break;
992
993 default:
994 return(-ENOPROTOOPT);
995 }
996 }
997
998 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
999 char __user *optval, unsigned int optlen)
1000 {
1001 switch(level) {
1002 case SOL_RAW:
1003 break;
1004
1005 case SOL_ICMPV6:
1006 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1007 return -EOPNOTSUPP;
1008 return rawv6_seticmpfilter(sk, level, optname, optval,
1009 optlen);
1010 case SOL_IPV6:
1011 if (optname == IPV6_CHECKSUM)
1012 break;
1013 default:
1014 return ipv6_setsockopt(sk, level, optname, optval,
1015 optlen);
1016 }
1017
1018 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1019 }
1020
1021 #ifdef CONFIG_COMPAT
1022 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1023 char __user *optval, unsigned int optlen)
1024 {
1025 switch (level) {
1026 case SOL_RAW:
1027 break;
1028 case SOL_ICMPV6:
1029 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1030 return -EOPNOTSUPP;
1031 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1032 case SOL_IPV6:
1033 if (optname == IPV6_CHECKSUM)
1034 break;
1035 default:
1036 return compat_ipv6_setsockopt(sk, level, optname,
1037 optval, optlen);
1038 }
1039 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1040 }
1041 #endif
1042
1043 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1044 char __user *optval, int __user *optlen)
1045 {
1046 struct raw6_sock *rp = raw6_sk(sk);
1047 int val, len;
1048
1049 if (get_user(len,optlen))
1050 return -EFAULT;
1051
1052 switch (optname) {
1053 case IPV6_CHECKSUM:
1054 /*
1055 * We allow getsockopt() for IPPROTO_IPV6-level
1056 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1057 * since RFC3542 is silent about it.
1058 */
1059 if (rp->checksum == 0)
1060 val = -1;
1061 else
1062 val = rp->offset;
1063 break;
1064
1065 default:
1066 return -ENOPROTOOPT;
1067 }
1068
1069 len = min_t(unsigned int, sizeof(int), len);
1070
1071 if (put_user(len, optlen))
1072 return -EFAULT;
1073 if (copy_to_user(optval,&val,len))
1074 return -EFAULT;
1075 return 0;
1076 }
1077
1078 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1079 char __user *optval, int __user *optlen)
1080 {
1081 switch(level) {
1082 case SOL_RAW:
1083 break;
1084
1085 case SOL_ICMPV6:
1086 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1087 return -EOPNOTSUPP;
1088 return rawv6_geticmpfilter(sk, level, optname, optval,
1089 optlen);
1090 case SOL_IPV6:
1091 if (optname == IPV6_CHECKSUM)
1092 break;
1093 default:
1094 return ipv6_getsockopt(sk, level, optname, optval,
1095 optlen);
1096 }
1097
1098 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1099 }
1100
1101 #ifdef CONFIG_COMPAT
1102 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1103 char __user *optval, int __user *optlen)
1104 {
1105 switch (level) {
1106 case SOL_RAW:
1107 break;
1108 case SOL_ICMPV6:
1109 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1110 return -EOPNOTSUPP;
1111 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1112 case SOL_IPV6:
1113 if (optname == IPV6_CHECKSUM)
1114 break;
1115 default:
1116 return compat_ipv6_getsockopt(sk, level, optname,
1117 optval, optlen);
1118 }
1119 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1120 }
1121 #endif
1122
1123 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1124 {
1125 switch(cmd) {
1126 case SIOCOUTQ:
1127 {
1128 int amount = sk_wmem_alloc_get(sk);
1129
1130 return put_user(amount, (int __user *)arg);
1131 }
1132 case SIOCINQ:
1133 {
1134 struct sk_buff *skb;
1135 int amount = 0;
1136
1137 spin_lock_bh(&sk->sk_receive_queue.lock);
1138 skb = skb_peek(&sk->sk_receive_queue);
1139 if (skb != NULL)
1140 amount = skb->tail - skb->transport_header;
1141 spin_unlock_bh(&sk->sk_receive_queue.lock);
1142 return put_user(amount, (int __user *)arg);
1143 }
1144
1145 default:
1146 #ifdef CONFIG_IPV6_MROUTE
1147 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1148 #else
1149 return -ENOIOCTLCMD;
1150 #endif
1151 }
1152 }
1153
1154 static void rawv6_close(struct sock *sk, long timeout)
1155 {
1156 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1157 ip6_ra_control(sk, -1);
1158 ip6mr_sk_done(sk);
1159 sk_common_release(sk);
1160 }
1161
1162 static void raw6_destroy(struct sock *sk)
1163 {
1164 lock_sock(sk);
1165 ip6_flush_pending_frames(sk);
1166 release_sock(sk);
1167
1168 inet6_destroy_sock(sk);
1169 }
1170
1171 static int rawv6_init_sk(struct sock *sk)
1172 {
1173 struct raw6_sock *rp = raw6_sk(sk);
1174
1175 switch (inet_sk(sk)->inet_num) {
1176 case IPPROTO_ICMPV6:
1177 rp->checksum = 1;
1178 rp->offset = 2;
1179 break;
1180 case IPPROTO_MH:
1181 rp->checksum = 1;
1182 rp->offset = 4;
1183 break;
1184 default:
1185 break;
1186 }
1187 return(0);
1188 }
1189
1190 struct proto rawv6_prot = {
1191 .name = "RAWv6",
1192 .owner = THIS_MODULE,
1193 .close = rawv6_close,
1194 .destroy = raw6_destroy,
1195 .connect = ip6_datagram_connect,
1196 .disconnect = udp_disconnect,
1197 .ioctl = rawv6_ioctl,
1198 .init = rawv6_init_sk,
1199 .setsockopt = rawv6_setsockopt,
1200 .getsockopt = rawv6_getsockopt,
1201 .sendmsg = rawv6_sendmsg,
1202 .recvmsg = rawv6_recvmsg,
1203 .bind = rawv6_bind,
1204 .backlog_rcv = rawv6_rcv_skb,
1205 .hash = raw_hash_sk,
1206 .unhash = raw_unhash_sk,
1207 .obj_size = sizeof(struct raw6_sock),
1208 .h.raw_hash = &raw_v6_hashinfo,
1209 #ifdef CONFIG_COMPAT
1210 .compat_setsockopt = compat_rawv6_setsockopt,
1211 .compat_getsockopt = compat_rawv6_getsockopt,
1212 #endif
1213 };
1214
1215 #ifdef CONFIG_PROC_FS
1216 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1217 {
1218 struct ipv6_pinfo *np = inet6_sk(sp);
1219 struct in6_addr *dest, *src;
1220 __u16 destp, srcp;
1221
1222 dest = &np->daddr;
1223 src = &np->rcv_saddr;
1224 destp = 0;
1225 srcp = inet_sk(sp)->inet_num;
1226 seq_printf(seq,
1227 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1228 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1229 i,
1230 src->s6_addr32[0], src->s6_addr32[1],
1231 src->s6_addr32[2], src->s6_addr32[3], srcp,
1232 dest->s6_addr32[0], dest->s6_addr32[1],
1233 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1234 sp->sk_state,
1235 sk_wmem_alloc_get(sp),
1236 sk_rmem_alloc_get(sp),
1237 0, 0L, 0,
1238 sock_i_uid(sp), 0,
1239 sock_i_ino(sp),
1240 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1241 }
1242
1243 static int raw6_seq_show(struct seq_file *seq, void *v)
1244 {
1245 if (v == SEQ_START_TOKEN)
1246 seq_printf(seq,
1247 " sl "
1248 "local_address "
1249 "remote_address "
1250 "st tx_queue rx_queue tr tm->when retrnsmt"
1251 " uid timeout inode ref pointer drops\n");
1252 else
1253 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1254 return 0;
1255 }
1256
1257 static const struct seq_operations raw6_seq_ops = {
1258 .start = raw_seq_start,
1259 .next = raw_seq_next,
1260 .stop = raw_seq_stop,
1261 .show = raw6_seq_show,
1262 };
1263
1264 static int raw6_seq_open(struct inode *inode, struct file *file)
1265 {
1266 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1267 }
1268
1269 static const struct file_operations raw6_seq_fops = {
1270 .owner = THIS_MODULE,
1271 .open = raw6_seq_open,
1272 .read = seq_read,
1273 .llseek = seq_lseek,
1274 .release = seq_release_net,
1275 };
1276
1277 static int __net_init raw6_init_net(struct net *net)
1278 {
1279 if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops))
1280 return -ENOMEM;
1281
1282 return 0;
1283 }
1284
1285 static void __net_exit raw6_exit_net(struct net *net)
1286 {
1287 proc_net_remove(net, "raw6");
1288 }
1289
1290 static struct pernet_operations raw6_net_ops = {
1291 .init = raw6_init_net,
1292 .exit = raw6_exit_net,
1293 };
1294
1295 int __init raw6_proc_init(void)
1296 {
1297 return register_pernet_subsys(&raw6_net_ops);
1298 }
1299
1300 void raw6_proc_exit(void)
1301 {
1302 unregister_pernet_subsys(&raw6_net_ops);
1303 }
1304 #endif /* CONFIG_PROC_FS */
1305
1306 /* Same as inet6_dgram_ops, sans udp_poll. */
1307 static const struct proto_ops inet6_sockraw_ops = {
1308 .family = PF_INET6,
1309 .owner = THIS_MODULE,
1310 .release = inet6_release,
1311 .bind = inet6_bind,
1312 .connect = inet_dgram_connect, /* ok */
1313 .socketpair = sock_no_socketpair, /* a do nothing */
1314 .accept = sock_no_accept, /* a do nothing */
1315 .getname = inet6_getname,
1316 .poll = datagram_poll, /* ok */
1317 .ioctl = inet6_ioctl, /* must change */
1318 .listen = sock_no_listen, /* ok */
1319 .shutdown = inet_shutdown, /* ok */
1320 .setsockopt = sock_common_setsockopt, /* ok */
1321 .getsockopt = sock_common_getsockopt, /* ok */
1322 .sendmsg = inet_sendmsg, /* ok */
1323 .recvmsg = sock_common_recvmsg, /* ok */
1324 .mmap = sock_no_mmap,
1325 .sendpage = sock_no_sendpage,
1326 #ifdef CONFIG_COMPAT
1327 .compat_setsockopt = compat_sock_common_setsockopt,
1328 .compat_getsockopt = compat_sock_common_getsockopt,
1329 #endif
1330 };
1331
1332 static struct inet_protosw rawv6_protosw = {
1333 .type = SOCK_RAW,
1334 .protocol = IPPROTO_IP, /* wild card */
1335 .prot = &rawv6_prot,
1336 .ops = &inet6_sockraw_ops,
1337 .no_check = UDP_CSUM_DEFAULT,
1338 .flags = INET_PROTOSW_REUSE,
1339 };
1340
1341 int __init rawv6_init(void)
1342 {
1343 int ret;
1344
1345 ret = inet6_register_protosw(&rawv6_protosw);
1346 if (ret)
1347 goto out;
1348 out:
1349 return ret;
1350 }
1351
1352 void rawv6_exit(void)
1353 {
1354 inet6_unregister_protosw(&rawv6_protosw);
1355 }
Tomato firmware and modifications.