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Merge branch 'upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
[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/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 #ifdef CONFIG_IPV6_MIP6
53 #include <net/mip6.h>
54 #endif
55
56 #include <net/rawv6.h>
57 #include <net/xfrm.h>
58
59 #include <linux/proc_fs.h>
60 #include <linux/seq_file.h>
61
62 struct hlist_head raw_v6_htable[RAWV6_HTABLE_SIZE];
63 DEFINE_RWLOCK(raw_v6_lock);
64
65 static void raw_v6_hash(struct sock *sk)
66 {
67 struct hlist_head *list = &raw_v6_htable[inet_sk(sk)->num &
68 (RAWV6_HTABLE_SIZE - 1)];
69
70 write_lock_bh(&raw_v6_lock);
71 sk_add_node(sk, list);
72 sock_prot_inc_use(sk->sk_prot);
73 write_unlock_bh(&raw_v6_lock);
74 }
75
76 static void raw_v6_unhash(struct sock *sk)
77 {
78 write_lock_bh(&raw_v6_lock);
79 if (sk_del_node_init(sk))
80 sock_prot_dec_use(sk->sk_prot);
81 write_unlock_bh(&raw_v6_lock);
82 }
83
84
85 /* Grumble... icmp and ip_input want to get at this... */
86 struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num,
87 struct in6_addr *loc_addr, struct in6_addr *rmt_addr,
88 int dif)
89 {
90 struct hlist_node *node;
91 int is_multicast = ipv6_addr_is_multicast(loc_addr);
92
93 sk_for_each_from(sk, node)
94 if (inet_sk(sk)->num == num) {
95 struct ipv6_pinfo *np = inet6_sk(sk);
96
97 if (!ipv6_addr_any(&np->daddr) &&
98 !ipv6_addr_equal(&np->daddr, rmt_addr))
99 continue;
100
101 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
102 continue;
103
104 if (!ipv6_addr_any(&np->rcv_saddr)) {
105 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
106 goto found;
107 if (is_multicast &&
108 inet6_mc_check(sk, loc_addr, rmt_addr))
109 goto found;
110 continue;
111 }
112 goto found;
113 }
114 sk = NULL;
115 found:
116 return sk;
117 }
118
119 /*
120 * 0 - deliver
121 * 1 - block
122 */
123 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb)
124 {
125 struct icmp6hdr *icmph;
126 struct raw6_sock *rp = raw6_sk(sk);
127
128 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) {
129 __u32 *data = &rp->filter.data[0];
130 int bit_nr;
131
132 icmph = (struct icmp6hdr *) skb->data;
133 bit_nr = icmph->icmp6_type;
134
135 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0;
136 }
137 return 0;
138 }
139
140 /*
141 * demultiplex raw sockets.
142 * (should consider queueing the skb in the sock receive_queue
143 * without calling rawv6.c)
144 *
145 * Caller owns SKB so we must make clones.
146 */
147 int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
148 {
149 struct in6_addr *saddr;
150 struct in6_addr *daddr;
151 struct sock *sk;
152 int delivered = 0;
153 __u8 hash;
154
155 saddr = &skb->nh.ipv6h->saddr;
156 daddr = saddr + 1;
157
158 hash = nexthdr & (MAX_INET_PROTOS - 1);
159
160 read_lock(&raw_v6_lock);
161 sk = sk_head(&raw_v6_htable[hash]);
162
163 /*
164 * The first socket found will be delivered after
165 * delivery to transport protocols.
166 */
167
168 if (sk == NULL)
169 goto out;
170
171 sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
172
173 while (sk) {
174 int filtered;
175
176 delivered = 1;
177 switch (nexthdr) {
178 case IPPROTO_ICMPV6:
179 filtered = icmpv6_filter(sk, skb);
180 break;
181 #ifdef CONFIG_IPV6_MIP6
182 case IPPROTO_MH:
183 /* XXX: To validate MH only once for each packet,
184 * this is placed here. It should be after checking
185 * xfrm policy, however it doesn't. The checking xfrm
186 * policy is placed in rawv6_rcv() because it is
187 * required for each socket.
188 */
189 filtered = mip6_mh_filter(sk, skb);
190 break;
191 #endif
192 default:
193 filtered = 0;
194 break;
195 }
196
197 if (filtered < 0)
198 break;
199 if (filtered == 0) {
200 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
201
202 /* Not releasing hash table! */
203 if (clone) {
204 nf_reset(clone);
205 rawv6_rcv(sk, clone);
206 }
207 }
208 sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr,
209 IP6CB(skb)->iif);
210 }
211 out:
212 read_unlock(&raw_v6_lock);
213 return delivered;
214 }
215
216 /* This cleans up af_inet6 a bit. -DaveM */
217 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
218 {
219 struct inet_sock *inet = inet_sk(sk);
220 struct ipv6_pinfo *np = inet6_sk(sk);
221 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
222 __be32 v4addr = 0;
223 int addr_type;
224 int err;
225
226 if (addr_len < SIN6_LEN_RFC2133)
227 return -EINVAL;
228 addr_type = ipv6_addr_type(&addr->sin6_addr);
229
230 /* Raw sockets are IPv6 only */
231 if (addr_type == IPV6_ADDR_MAPPED)
232 return(-EADDRNOTAVAIL);
233
234 lock_sock(sk);
235
236 err = -EINVAL;
237 if (sk->sk_state != TCP_CLOSE)
238 goto out;
239
240 /* Check if the address belongs to the host. */
241 if (addr_type != IPV6_ADDR_ANY) {
242 struct net_device *dev = NULL;
243
244 if (addr_type & IPV6_ADDR_LINKLOCAL) {
245 if (addr_len >= sizeof(struct sockaddr_in6) &&
246 addr->sin6_scope_id) {
247 /* Override any existing binding, if another
248 * one is supplied by user.
249 */
250 sk->sk_bound_dev_if = addr->sin6_scope_id;
251 }
252
253 /* Binding to link-local address requires an interface */
254 if (!sk->sk_bound_dev_if)
255 goto out;
256
257 dev = dev_get_by_index(sk->sk_bound_dev_if);
258 if (!dev) {
259 err = -ENODEV;
260 goto out;
261 }
262 }
263
264 /* ipv4 addr of the socket is invalid. Only the
265 * unspecified and mapped address have a v4 equivalent.
266 */
267 v4addr = LOOPBACK4_IPV6;
268 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
269 err = -EADDRNOTAVAIL;
270 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
271 if (dev)
272 dev_put(dev);
273 goto out;
274 }
275 }
276 if (dev)
277 dev_put(dev);
278 }
279
280 inet->rcv_saddr = inet->saddr = v4addr;
281 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
282 if (!(addr_type & IPV6_ADDR_MULTICAST))
283 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
284 err = 0;
285 out:
286 release_sock(sk);
287 return err;
288 }
289
290 void rawv6_err(struct sock *sk, struct sk_buff *skb,
291 struct inet6_skb_parm *opt,
292 int type, int code, int offset, __be32 info)
293 {
294 struct inet_sock *inet = inet_sk(sk);
295 struct ipv6_pinfo *np = inet6_sk(sk);
296 int err;
297 int harderr;
298
299 /* Report error on raw socket, if:
300 1. User requested recverr.
301 2. Socket is connected (otherwise the error indication
302 is useless without recverr and error is hard.
303 */
304 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
305 return;
306
307 harderr = icmpv6_err_convert(type, code, &err);
308 if (type == ICMPV6_PKT_TOOBIG)
309 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
310
311 if (np->recverr) {
312 u8 *payload = skb->data;
313 if (!inet->hdrincl)
314 payload += offset;
315 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
316 }
317
318 if (np->recverr || harderr) {
319 sk->sk_err = err;
320 sk->sk_error_report(sk);
321 }
322 }
323
324 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
325 {
326 if ((raw6_sk(sk)->checksum || sk->sk_filter) &&
327 skb_checksum_complete(skb)) {
328 /* FIXME: increment a raw6 drops counter here */
329 kfree_skb(skb);
330 return 0;
331 }
332
333 /* Charge it to the socket. */
334 if (sock_queue_rcv_skb(sk,skb)<0) {
335 /* FIXME: increment a raw6 drops counter here */
336 kfree_skb(skb);
337 return 0;
338 }
339
340 return 0;
341 }
342
343 /*
344 * This is next to useless...
345 * if we demultiplex in network layer we don't need the extra call
346 * just to queue the skb...
347 * maybe we could have the network decide upon a hint if it
348 * should call raw_rcv for demultiplexing
349 */
350 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
351 {
352 struct inet_sock *inet = inet_sk(sk);
353 struct raw6_sock *rp = raw6_sk(sk);
354
355 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
356 kfree_skb(skb);
357 return NET_RX_DROP;
358 }
359
360 if (!rp->checksum)
361 skb->ip_summed = CHECKSUM_UNNECESSARY;
362
363 if (skb->ip_summed == CHECKSUM_COMPLETE) {
364 skb_postpull_rcsum(skb, skb->nh.raw,
365 skb->h.raw - skb->nh.raw);
366 if (!csum_ipv6_magic(&skb->nh.ipv6h->saddr,
367 &skb->nh.ipv6h->daddr,
368 skb->len, inet->num, skb->csum))
369 skb->ip_summed = CHECKSUM_UNNECESSARY;
370 }
371 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
372 skb->csum = ~csum_unfold(csum_ipv6_magic(&skb->nh.ipv6h->saddr,
373 &skb->nh.ipv6h->daddr,
374 skb->len, inet->num, 0));
375
376 if (inet->hdrincl) {
377 if (skb_checksum_complete(skb)) {
378 /* FIXME: increment a raw6 drops counter here */
379 kfree_skb(skb);
380 return 0;
381 }
382 }
383
384 rawv6_rcv_skb(sk, skb);
385 return 0;
386 }
387
388
389 /*
390 * This should be easy, if there is something there
391 * we return it, otherwise we block.
392 */
393
394 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
395 struct msghdr *msg, size_t len,
396 int noblock, int flags, int *addr_len)
397 {
398 struct ipv6_pinfo *np = inet6_sk(sk);
399 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
400 struct sk_buff *skb;
401 size_t copied;
402 int err;
403
404 if (flags & MSG_OOB)
405 return -EOPNOTSUPP;
406
407 if (addr_len)
408 *addr_len=sizeof(*sin6);
409
410 if (flags & MSG_ERRQUEUE)
411 return ipv6_recv_error(sk, msg, len);
412
413 skb = skb_recv_datagram(sk, flags, noblock, &err);
414 if (!skb)
415 goto out;
416
417 copied = skb->len;
418 if (copied > len) {
419 copied = len;
420 msg->msg_flags |= MSG_TRUNC;
421 }
422
423 if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
424 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
425 } else if (msg->msg_flags&MSG_TRUNC) {
426 if (__skb_checksum_complete(skb))
427 goto csum_copy_err;
428 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
429 } else {
430 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
431 if (err == -EINVAL)
432 goto csum_copy_err;
433 }
434 if (err)
435 goto out_free;
436
437 /* Copy the address. */
438 if (sin6) {
439 sin6->sin6_family = AF_INET6;
440 sin6->sin6_port = 0;
441 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
442 sin6->sin6_flowinfo = 0;
443 sin6->sin6_scope_id = 0;
444 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
445 sin6->sin6_scope_id = IP6CB(skb)->iif;
446 }
447
448 sock_recv_timestamp(msg, sk, skb);
449
450 if (np->rxopt.all)
451 datagram_recv_ctl(sk, msg, skb);
452
453 err = copied;
454 if (flags & MSG_TRUNC)
455 err = skb->len;
456
457 out_free:
458 skb_free_datagram(sk, skb);
459 out:
460 return err;
461
462 csum_copy_err:
463 skb_kill_datagram(sk, skb, flags);
464
465 /* Error for blocking case is chosen to masquerade
466 as some normal condition.
467 */
468 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
469 /* FIXME: increment a raw6 drops counter here */
470 goto out;
471 }
472
473 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
474 struct raw6_sock *rp)
475 {
476 struct sk_buff *skb;
477 int err = 0;
478 int offset;
479 int len;
480 int total_len;
481 __wsum tmp_csum;
482 __sum16 csum;
483
484 if (!rp->checksum)
485 goto send;
486
487 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
488 goto out;
489
490 offset = rp->offset;
491 total_len = inet_sk(sk)->cork.length - (skb->nh.raw - skb->data);
492 if (offset >= total_len - 1) {
493 err = -EINVAL;
494 ip6_flush_pending_frames(sk);
495 goto out;
496 }
497
498 /* should be check HW csum miyazawa */
499 if (skb_queue_len(&sk->sk_write_queue) == 1) {
500 /*
501 * Only one fragment on the socket.
502 */
503 tmp_csum = skb->csum;
504 } else {
505 struct sk_buff *csum_skb = NULL;
506 tmp_csum = 0;
507
508 skb_queue_walk(&sk->sk_write_queue, skb) {
509 tmp_csum = csum_add(tmp_csum, skb->csum);
510
511 if (csum_skb)
512 continue;
513
514 len = skb->len - (skb->h.raw - skb->data);
515 if (offset >= len) {
516 offset -= len;
517 continue;
518 }
519
520 csum_skb = skb;
521 }
522
523 skb = csum_skb;
524 }
525
526 offset += skb->h.raw - skb->data;
527 if (skb_copy_bits(skb, offset, &csum, 2))
528 BUG();
529
530 /* in case cksum was not initialized */
531 if (unlikely(csum))
532 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
533
534 csum = csum_ipv6_magic(&fl->fl6_src,
535 &fl->fl6_dst,
536 total_len, fl->proto, tmp_csum);
537
538 if (csum == 0 && fl->proto == IPPROTO_UDP)
539 csum = CSUM_MANGLED_0;
540
541 if (skb_store_bits(skb, offset, &csum, 2))
542 BUG();
543
544 send:
545 err = ip6_push_pending_frames(sk);
546 out:
547 return err;
548 }
549
550 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
551 struct flowi *fl, struct rt6_info *rt,
552 unsigned int flags)
553 {
554 struct ipv6_pinfo *np = inet6_sk(sk);
555 struct ipv6hdr *iph;
556 struct sk_buff *skb;
557 unsigned int hh_len;
558 int err;
559
560 if (length > rt->u.dst.dev->mtu) {
561 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu);
562 return -EMSGSIZE;
563 }
564 if (flags&MSG_PROBE)
565 goto out;
566
567 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
568
569 skb = sock_alloc_send_skb(sk, length+hh_len+15,
570 flags&MSG_DONTWAIT, &err);
571 if (skb == NULL)
572 goto error;
573 skb_reserve(skb, hh_len);
574
575 skb->priority = sk->sk_priority;
576 skb->dst = dst_clone(&rt->u.dst);
577
578 skb->nh.ipv6h = iph = (struct ipv6hdr *)skb_put(skb, length);
579
580 skb->ip_summed = CHECKSUM_NONE;
581
582 skb->h.raw = skb->nh.raw;
583 err = memcpy_fromiovecend((void *)iph, from, 0, length);
584 if (err)
585 goto error_fault;
586
587 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS);
588 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
589 dst_output);
590 if (err > 0)
591 err = np->recverr ? net_xmit_errno(err) : 0;
592 if (err)
593 goto error;
594 out:
595 return 0;
596
597 error_fault:
598 err = -EFAULT;
599 kfree_skb(skb);
600 error:
601 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
602 return err;
603 }
604
605 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
606 {
607 struct iovec *iov;
608 u8 __user *type = NULL;
609 u8 __user *code = NULL;
610 #ifdef CONFIG_IPV6_MIP6
611 u8 len = 0;
612 #endif
613 int probed = 0;
614 int i;
615
616 if (!msg->msg_iov)
617 return 0;
618
619 for (i = 0; i < msg->msg_iovlen; i++) {
620 iov = &msg->msg_iov[i];
621 if (!iov)
622 continue;
623
624 switch (fl->proto) {
625 case IPPROTO_ICMPV6:
626 /* check if one-byte field is readable or not. */
627 if (iov->iov_base && iov->iov_len < 1)
628 break;
629
630 if (!type) {
631 type = iov->iov_base;
632 /* check if code field is readable or not. */
633 if (iov->iov_len > 1)
634 code = type + 1;
635 } else if (!code)
636 code = iov->iov_base;
637
638 if (type && code) {
639 if (get_user(fl->fl_icmp_type, type) ||
640 get_user(fl->fl_icmp_code, code))
641 return -EFAULT;
642 probed = 1;
643 }
644 break;
645 #ifdef CONFIG_IPV6_MIP6
646 case IPPROTO_MH:
647 if (iov->iov_base && iov->iov_len < 1)
648 break;
649 /* check if type field is readable or not. */
650 if (iov->iov_len > 2 - len) {
651 u8 __user *p = iov->iov_base;
652 if (get_user(fl->fl_mh_type, &p[2 - len]))
653 return -EFAULT;
654 probed = 1;
655 } else
656 len += iov->iov_len;
657
658 break;
659 #endif
660 default:
661 probed = 1;
662 break;
663 }
664 if (probed)
665 break;
666 }
667 return 0;
668 }
669
670 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
671 struct msghdr *msg, size_t len)
672 {
673 struct ipv6_txoptions opt_space;
674 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
675 struct in6_addr *daddr, *final_p = NULL, final;
676 struct inet_sock *inet = inet_sk(sk);
677 struct ipv6_pinfo *np = inet6_sk(sk);
678 struct raw6_sock *rp = raw6_sk(sk);
679 struct ipv6_txoptions *opt = NULL;
680 struct ip6_flowlabel *flowlabel = NULL;
681 struct dst_entry *dst = NULL;
682 struct flowi fl;
683 int addr_len = msg->msg_namelen;
684 int hlimit = -1;
685 int tclass = -1;
686 u16 proto;
687 int err;
688
689 /* Rough check on arithmetic overflow,
690 better check is made in ip6_append_data().
691 */
692 if (len > INT_MAX)
693 return -EMSGSIZE;
694
695 /* Mirror BSD error message compatibility */
696 if (msg->msg_flags & MSG_OOB)
697 return -EOPNOTSUPP;
698
699 /*
700 * Get and verify the address.
701 */
702 memset(&fl, 0, sizeof(fl));
703
704 if (sin6) {
705 if (addr_len < SIN6_LEN_RFC2133)
706 return -EINVAL;
707
708 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
709 return(-EAFNOSUPPORT);
710
711 /* port is the proto value [0..255] carried in nexthdr */
712 proto = ntohs(sin6->sin6_port);
713
714 if (!proto)
715 proto = inet->num;
716 else if (proto != inet->num)
717 return(-EINVAL);
718
719 if (proto > 255)
720 return(-EINVAL);
721
722 daddr = &sin6->sin6_addr;
723 if (np->sndflow) {
724 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
725 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
726 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
727 if (flowlabel == NULL)
728 return -EINVAL;
729 daddr = &flowlabel->dst;
730 }
731 }
732
733 /*
734 * Otherwise it will be difficult to maintain
735 * sk->sk_dst_cache.
736 */
737 if (sk->sk_state == TCP_ESTABLISHED &&
738 ipv6_addr_equal(daddr, &np->daddr))
739 daddr = &np->daddr;
740
741 if (addr_len >= sizeof(struct sockaddr_in6) &&
742 sin6->sin6_scope_id &&
743 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
744 fl.oif = sin6->sin6_scope_id;
745 } else {
746 if (sk->sk_state != TCP_ESTABLISHED)
747 return -EDESTADDRREQ;
748
749 proto = inet->num;
750 daddr = &np->daddr;
751 fl.fl6_flowlabel = np->flow_label;
752 }
753
754 if (ipv6_addr_any(daddr)) {
755 /*
756 * unspecified destination address
757 * treated as error... is this correct ?
758 */
759 fl6_sock_release(flowlabel);
760 return(-EINVAL);
761 }
762
763 if (fl.oif == 0)
764 fl.oif = sk->sk_bound_dev_if;
765
766 if (msg->msg_controllen) {
767 opt = &opt_space;
768 memset(opt, 0, sizeof(struct ipv6_txoptions));
769 opt->tot_len = sizeof(struct ipv6_txoptions);
770
771 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
772 if (err < 0) {
773 fl6_sock_release(flowlabel);
774 return err;
775 }
776 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
777 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
778 if (flowlabel == NULL)
779 return -EINVAL;
780 }
781 if (!(opt->opt_nflen|opt->opt_flen))
782 opt = NULL;
783 }
784 if (opt == NULL)
785 opt = np->opt;
786 if (flowlabel)
787 opt = fl6_merge_options(&opt_space, flowlabel, opt);
788 opt = ipv6_fixup_options(&opt_space, opt);
789
790 fl.proto = proto;
791 err = rawv6_probe_proto_opt(&fl, msg);
792 if (err)
793 goto out;
794
795 ipv6_addr_copy(&fl.fl6_dst, daddr);
796 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
797 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
798
799 /* merge ip6_build_xmit from ip6_output */
800 if (opt && opt->srcrt) {
801 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
802 ipv6_addr_copy(&final, &fl.fl6_dst);
803 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
804 final_p = &final;
805 }
806
807 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
808 fl.oif = np->mcast_oif;
809 security_sk_classify_flow(sk, &fl);
810
811 err = ip6_dst_lookup(sk, &dst, &fl);
812 if (err)
813 goto out;
814 if (final_p)
815 ipv6_addr_copy(&fl.fl6_dst, final_p);
816
817 if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
818 goto out;
819
820 if (hlimit < 0) {
821 if (ipv6_addr_is_multicast(&fl.fl6_dst))
822 hlimit = np->mcast_hops;
823 else
824 hlimit = np->hop_limit;
825 if (hlimit < 0)
826 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
827 if (hlimit < 0)
828 hlimit = ipv6_get_hoplimit(dst->dev);
829 }
830
831 if (tclass < 0) {
832 tclass = np->tclass;
833 if (tclass < 0)
834 tclass = 0;
835 }
836
837 if (msg->msg_flags&MSG_CONFIRM)
838 goto do_confirm;
839
840 back_from_confirm:
841 if (inet->hdrincl) {
842 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags);
843 } else {
844 lock_sock(sk);
845 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
846 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst,
847 msg->msg_flags);
848
849 if (err)
850 ip6_flush_pending_frames(sk);
851 else if (!(msg->msg_flags & MSG_MORE))
852 err = rawv6_push_pending_frames(sk, &fl, rp);
853 }
854 done:
855 dst_release(dst);
856 if (!inet->hdrincl)
857 release_sock(sk);
858 out:
859 fl6_sock_release(flowlabel);
860 return err<0?err:len;
861 do_confirm:
862 dst_confirm(dst);
863 if (!(msg->msg_flags & MSG_PROBE) || len)
864 goto back_from_confirm;
865 err = 0;
866 goto done;
867 }
868
869 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
870 char __user *optval, int optlen)
871 {
872 switch (optname) {
873 case ICMPV6_FILTER:
874 if (optlen > sizeof(struct icmp6_filter))
875 optlen = sizeof(struct icmp6_filter);
876 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
877 return -EFAULT;
878 return 0;
879 default:
880 return -ENOPROTOOPT;
881 };
882
883 return 0;
884 }
885
886 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
887 char __user *optval, int __user *optlen)
888 {
889 int len;
890
891 switch (optname) {
892 case ICMPV6_FILTER:
893 if (get_user(len, optlen))
894 return -EFAULT;
895 if (len < 0)
896 return -EINVAL;
897 if (len > sizeof(struct icmp6_filter))
898 len = sizeof(struct icmp6_filter);
899 if (put_user(len, optlen))
900 return -EFAULT;
901 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
902 return -EFAULT;
903 return 0;
904 default:
905 return -ENOPROTOOPT;
906 };
907
908 return 0;
909 }
910
911
912 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
913 char __user *optval, int optlen)
914 {
915 struct raw6_sock *rp = raw6_sk(sk);
916 int val;
917
918 if (get_user(val, (int __user *)optval))
919 return -EFAULT;
920
921 switch (optname) {
922 case IPV6_CHECKSUM:
923 /* You may get strange result with a positive odd offset;
924 RFC2292bis agrees with me. */
925 if (val > 0 && (val&1))
926 return(-EINVAL);
927 if (val < 0) {
928 rp->checksum = 0;
929 } else {
930 rp->checksum = 1;
931 rp->offset = val;
932 }
933
934 return 0;
935 break;
936
937 default:
938 return(-ENOPROTOOPT);
939 }
940 }
941
942 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
943 char __user *optval, int optlen)
944 {
945 switch(level) {
946 case SOL_RAW:
947 break;
948
949 case SOL_ICMPV6:
950 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
951 return -EOPNOTSUPP;
952 return rawv6_seticmpfilter(sk, level, optname, optval,
953 optlen);
954 case SOL_IPV6:
955 if (optname == IPV6_CHECKSUM)
956 break;
957 default:
958 return ipv6_setsockopt(sk, level, optname, optval,
959 optlen);
960 };
961 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
962 }
963
964 #ifdef CONFIG_COMPAT
965 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
966 char __user *optval, int optlen)
967 {
968 switch (level) {
969 case SOL_RAW:
970 break;
971 case SOL_ICMPV6:
972 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
973 return -EOPNOTSUPP;
974 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
975 case SOL_IPV6:
976 if (optname == IPV6_CHECKSUM)
977 break;
978 default:
979 return compat_ipv6_setsockopt(sk, level, optname,
980 optval, optlen);
981 };
982 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
983 }
984 #endif
985
986 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
987 char __user *optval, int __user *optlen)
988 {
989 struct raw6_sock *rp = raw6_sk(sk);
990 int val, len;
991
992 if (get_user(len,optlen))
993 return -EFAULT;
994
995 switch (optname) {
996 case IPV6_CHECKSUM:
997 if (rp->checksum == 0)
998 val = -1;
999 else
1000 val = rp->offset;
1001 break;
1002
1003 default:
1004 return -ENOPROTOOPT;
1005 }
1006
1007 len = min_t(unsigned int, sizeof(int), len);
1008
1009 if (put_user(len, optlen))
1010 return -EFAULT;
1011 if (copy_to_user(optval,&val,len))
1012 return -EFAULT;
1013 return 0;
1014 }
1015
1016 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1017 char __user *optval, int __user *optlen)
1018 {
1019 switch(level) {
1020 case SOL_RAW:
1021 break;
1022
1023 case SOL_ICMPV6:
1024 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1025 return -EOPNOTSUPP;
1026 return rawv6_geticmpfilter(sk, level, optname, optval,
1027 optlen);
1028 case SOL_IPV6:
1029 if (optname == IPV6_CHECKSUM)
1030 break;
1031 default:
1032 return ipv6_getsockopt(sk, level, optname, optval,
1033 optlen);
1034 };
1035 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1036 }
1037
1038 #ifdef CONFIG_COMPAT
1039 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1040 char __user *optval, int __user *optlen)
1041 {
1042 switch (level) {
1043 case SOL_RAW:
1044 break;
1045 case SOL_ICMPV6:
1046 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1047 return -EOPNOTSUPP;
1048 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1049 case SOL_IPV6:
1050 if (optname == IPV6_CHECKSUM)
1051 break;
1052 default:
1053 return compat_ipv6_getsockopt(sk, level, optname,
1054 optval, optlen);
1055 };
1056 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1057 }
1058 #endif
1059
1060 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1061 {
1062 switch(cmd) {
1063 case SIOCOUTQ:
1064 {
1065 int amount = atomic_read(&sk->sk_wmem_alloc);
1066 return put_user(amount, (int __user *)arg);
1067 }
1068 case SIOCINQ:
1069 {
1070 struct sk_buff *skb;
1071 int amount = 0;
1072
1073 spin_lock_bh(&sk->sk_receive_queue.lock);
1074 skb = skb_peek(&sk->sk_receive_queue);
1075 if (skb != NULL)
1076 amount = skb->tail - skb->h.raw;
1077 spin_unlock_bh(&sk->sk_receive_queue.lock);
1078 return put_user(amount, (int __user *)arg);
1079 }
1080
1081 default:
1082 return -ENOIOCTLCMD;
1083 }
1084 }
1085
1086 static void rawv6_close(struct sock *sk, long timeout)
1087 {
1088 if (inet_sk(sk)->num == IPPROTO_RAW)
1089 ip6_ra_control(sk, -1, NULL);
1090
1091 sk_common_release(sk);
1092 }
1093
1094 static int rawv6_init_sk(struct sock *sk)
1095 {
1096 struct raw6_sock *rp = raw6_sk(sk);
1097
1098 switch (inet_sk(sk)->num) {
1099 case IPPROTO_ICMPV6:
1100 rp->checksum = 1;
1101 rp->offset = 2;
1102 break;
1103 case IPPROTO_MH:
1104 rp->checksum = 1;
1105 rp->offset = 4;
1106 break;
1107 default:
1108 break;
1109 }
1110 return(0);
1111 }
1112
1113 struct proto rawv6_prot = {
1114 .name = "RAWv6",
1115 .owner = THIS_MODULE,
1116 .close = rawv6_close,
1117 .connect = ip6_datagram_connect,
1118 .disconnect = udp_disconnect,
1119 .ioctl = rawv6_ioctl,
1120 .init = rawv6_init_sk,
1121 .destroy = inet6_destroy_sock,
1122 .setsockopt = rawv6_setsockopt,
1123 .getsockopt = rawv6_getsockopt,
1124 .sendmsg = rawv6_sendmsg,
1125 .recvmsg = rawv6_recvmsg,
1126 .bind = rawv6_bind,
1127 .backlog_rcv = rawv6_rcv_skb,
1128 .hash = raw_v6_hash,
1129 .unhash = raw_v6_unhash,
1130 .obj_size = sizeof(struct raw6_sock),
1131 #ifdef CONFIG_COMPAT
1132 .compat_setsockopt = compat_rawv6_setsockopt,
1133 .compat_getsockopt = compat_rawv6_getsockopt,
1134 #endif
1135 };
1136
1137 #ifdef CONFIG_PROC_FS
1138 struct raw6_iter_state {
1139 int bucket;
1140 };
1141
1142 #define raw6_seq_private(seq) ((struct raw6_iter_state *)(seq)->private)
1143
1144 static struct sock *raw6_get_first(struct seq_file *seq)
1145 {
1146 struct sock *sk;
1147 struct hlist_node *node;
1148 struct raw6_iter_state* state = raw6_seq_private(seq);
1149
1150 for (state->bucket = 0; state->bucket < RAWV6_HTABLE_SIZE; ++state->bucket)
1151 sk_for_each(sk, node, &raw_v6_htable[state->bucket])
1152 if (sk->sk_family == PF_INET6)
1153 goto out;
1154 sk = NULL;
1155 out:
1156 return sk;
1157 }
1158
1159 static struct sock *raw6_get_next(struct seq_file *seq, struct sock *sk)
1160 {
1161 struct raw6_iter_state* state = raw6_seq_private(seq);
1162
1163 do {
1164 sk = sk_next(sk);
1165 try_again:
1166 ;
1167 } while (sk && sk->sk_family != PF_INET6);
1168
1169 if (!sk && ++state->bucket < RAWV6_HTABLE_SIZE) {
1170 sk = sk_head(&raw_v6_htable[state->bucket]);
1171 goto try_again;
1172 }
1173 return sk;
1174 }
1175
1176 static struct sock *raw6_get_idx(struct seq_file *seq, loff_t pos)
1177 {
1178 struct sock *sk = raw6_get_first(seq);
1179 if (sk)
1180 while (pos && (sk = raw6_get_next(seq, sk)) != NULL)
1181 --pos;
1182 return pos ? NULL : sk;
1183 }
1184
1185 static void *raw6_seq_start(struct seq_file *seq, loff_t *pos)
1186 {
1187 read_lock(&raw_v6_lock);
1188 return *pos ? raw6_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
1189 }
1190
1191 static void *raw6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1192 {
1193 struct sock *sk;
1194
1195 if (v == SEQ_START_TOKEN)
1196 sk = raw6_get_first(seq);
1197 else
1198 sk = raw6_get_next(seq, v);
1199 ++*pos;
1200 return sk;
1201 }
1202
1203 static void raw6_seq_stop(struct seq_file *seq, void *v)
1204 {
1205 read_unlock(&raw_v6_lock);
1206 }
1207
1208 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1209 {
1210 struct ipv6_pinfo *np = inet6_sk(sp);
1211 struct in6_addr *dest, *src;
1212 __u16 destp, srcp;
1213
1214 dest = &np->daddr;
1215 src = &np->rcv_saddr;
1216 destp = 0;
1217 srcp = inet_sk(sp)->num;
1218 seq_printf(seq,
1219 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1220 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1221 i,
1222 src->s6_addr32[0], src->s6_addr32[1],
1223 src->s6_addr32[2], src->s6_addr32[3], srcp,
1224 dest->s6_addr32[0], dest->s6_addr32[1],
1225 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1226 sp->sk_state,
1227 atomic_read(&sp->sk_wmem_alloc),
1228 atomic_read(&sp->sk_rmem_alloc),
1229 0, 0L, 0,
1230 sock_i_uid(sp), 0,
1231 sock_i_ino(sp),
1232 atomic_read(&sp->sk_refcnt), sp);
1233 }
1234
1235 static int raw6_seq_show(struct seq_file *seq, void *v)
1236 {
1237 if (v == SEQ_START_TOKEN)
1238 seq_printf(seq,
1239 " sl "
1240 "local_address "
1241 "remote_address "
1242 "st tx_queue rx_queue tr tm->when retrnsmt"
1243 " uid timeout inode\n");
1244 else
1245 raw6_sock_seq_show(seq, v, raw6_seq_private(seq)->bucket);
1246 return 0;
1247 }
1248
1249 static struct seq_operations raw6_seq_ops = {
1250 .start = raw6_seq_start,
1251 .next = raw6_seq_next,
1252 .stop = raw6_seq_stop,
1253 .show = raw6_seq_show,
1254 };
1255
1256 static int raw6_seq_open(struct inode *inode, struct file *file)
1257 {
1258 struct seq_file *seq;
1259 int rc = -ENOMEM;
1260 struct raw6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1261 if (!s)
1262 goto out;
1263 rc = seq_open(file, &raw6_seq_ops);
1264 if (rc)
1265 goto out_kfree;
1266 seq = file->private_data;
1267 seq->private = s;
1268 out:
1269 return rc;
1270 out_kfree:
1271 kfree(s);
1272 goto out;
1273 }
1274
1275 static const struct file_operations raw6_seq_fops = {
1276 .owner = THIS_MODULE,
1277 .open = raw6_seq_open,
1278 .read = seq_read,
1279 .llseek = seq_lseek,
1280 .release = seq_release_private,
1281 };
1282
1283 int __init raw6_proc_init(void)
1284 {
1285 if (!proc_net_fops_create("raw6", S_IRUGO, &raw6_seq_fops))
1286 return -ENOMEM;
1287 return 0;
1288 }
1289
1290 void raw6_proc_exit(void)
1291 {
1292 proc_net_remove("raw6");
1293 }
1294 #endif /* CONFIG_PROC_FS */
Linux kernel - Deliverables
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