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[DLM] add lock timeouts and warnings [2/6]
[linux-2.6/kvm.git] / net / ipv6 / raw.c
bloba58459a766849fe71e2fa4c08cb67dd65e78aa03
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 = &ipv6_hdr(skb)->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_network_header(skb),
365 skb_network_header_len(skb));
366 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
367 &ipv6_hdr(skb)->daddr,
368 skb->len, inet->num, skb->csum))
369 skb->ip_summed = CHECKSUM_UNNECESSARY;
370 }
371 if (!skb_csum_unnecessary(skb))
372 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
373 &ipv6_hdr(skb)->daddr,
374 skb->len,
375 inet->num, 0));
376
377 if (inet->hdrincl) {
378 if (skb_checksum_complete(skb)) {
379 /* FIXME: increment a raw6 drops counter here */
380 kfree_skb(skb);
381 return 0;
382 }
383 }
384
385 rawv6_rcv_skb(sk, skb);
386 return 0;
387 }
388
389
390 /*
391 * This should be easy, if there is something there
392 * we return it, otherwise we block.
393 */
394
395 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
396 struct msghdr *msg, size_t len,
397 int noblock, int flags, int *addr_len)
398 {
399 struct ipv6_pinfo *np = inet6_sk(sk);
400 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
401 struct sk_buff *skb;
402 size_t copied;
403 int err;
404
405 if (flags & MSG_OOB)
406 return -EOPNOTSUPP;
407
408 if (addr_len)
409 *addr_len=sizeof(*sin6);
410
411 if (flags & MSG_ERRQUEUE)
412 return ipv6_recv_error(sk, msg, len);
413
414 skb = skb_recv_datagram(sk, flags, noblock, &err);
415 if (!skb)
416 goto out;
417
418 copied = skb->len;
419 if (copied > len) {
420 copied = len;
421 msg->msg_flags |= MSG_TRUNC;
422 }
423
424 if (skb_csum_unnecessary(skb)) {
425 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
426 } else if (msg->msg_flags&MSG_TRUNC) {
427 if (__skb_checksum_complete(skb))
428 goto csum_copy_err;
429 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
430 } else {
431 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
432 if (err == -EINVAL)
433 goto csum_copy_err;
434 }
435 if (err)
436 goto out_free;
437
438 /* Copy the address. */
439 if (sin6) {
440 sin6->sin6_family = AF_INET6;
441 sin6->sin6_port = 0;
442 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
443 sin6->sin6_flowinfo = 0;
444 sin6->sin6_scope_id = 0;
445 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
446 sin6->sin6_scope_id = IP6CB(skb)->iif;
447 }
448
449 sock_recv_timestamp(msg, sk, skb);
450
451 if (np->rxopt.all)
452 datagram_recv_ctl(sk, msg, skb);
453
454 err = copied;
455 if (flags & MSG_TRUNC)
456 err = skb->len;
457
458 out_free:
459 skb_free_datagram(sk, skb);
460 out:
461 return err;
462
463 csum_copy_err:
464 skb_kill_datagram(sk, skb, flags);
465
466 /* Error for blocking case is chosen to masquerade
467 as some normal condition.
468 */
469 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
470 /* FIXME: increment a raw6 drops counter here */
471 goto out;
472 }
473
474 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
475 struct raw6_sock *rp)
476 {
477 struct sk_buff *skb;
478 int err = 0;
479 int offset;
480 int len;
481 int total_len;
482 __wsum tmp_csum;
483 __sum16 csum;
484
485 if (!rp->checksum)
486 goto send;
487
488 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
489 goto out;
490
491 offset = rp->offset;
492 total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) -
493 skb->data);
494 if (offset >= total_len - 1) {
495 err = -EINVAL;
496 ip6_flush_pending_frames(sk);
497 goto out;
498 }
499
500 /* should be check HW csum miyazawa */
501 if (skb_queue_len(&sk->sk_write_queue) == 1) {
502 /*
503 * Only one fragment on the socket.
504 */
505 tmp_csum = skb->csum;
506 } else {
507 struct sk_buff *csum_skb = NULL;
508 tmp_csum = 0;
509
510 skb_queue_walk(&sk->sk_write_queue, skb) {
511 tmp_csum = csum_add(tmp_csum, skb->csum);
512
513 if (csum_skb)
514 continue;
515
516 len = skb->len - skb_transport_offset(skb);
517 if (offset >= len) {
518 offset -= len;
519 continue;
520 }
521
522 csum_skb = skb;
523 }
524
525 skb = csum_skb;
526 }
527
528 offset += skb_transport_offset(skb);
529 if (skb_copy_bits(skb, offset, &csum, 2))
530 BUG();
531
532 /* in case cksum was not initialized */
533 if (unlikely(csum))
534 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
535
536 csum = csum_ipv6_magic(&fl->fl6_src,
537 &fl->fl6_dst,
538 total_len, fl->proto, tmp_csum);
539
540 if (csum == 0 && fl->proto == IPPROTO_UDP)
541 csum = CSUM_MANGLED_0;
542
543 if (skb_store_bits(skb, offset, &csum, 2))
544 BUG();
545
546 send:
547 err = ip6_push_pending_frames(sk);
548 out:
549 return err;
550 }
551
552 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
553 struct flowi *fl, struct rt6_info *rt,
554 unsigned int flags)
555 {
556 struct ipv6_pinfo *np = inet6_sk(sk);
557 struct ipv6hdr *iph;
558 struct sk_buff *skb;
559 unsigned int hh_len;
560 int err;
561
562 if (length > rt->u.dst.dev->mtu) {
563 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu);
564 return -EMSGSIZE;
565 }
566 if (flags&MSG_PROBE)
567 goto out;
568
569 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
570
571 skb = sock_alloc_send_skb(sk, length+hh_len+15,
572 flags&MSG_DONTWAIT, &err);
573 if (skb == NULL)
574 goto error;
575 skb_reserve(skb, hh_len);
576
577 skb->priority = sk->sk_priority;
578 skb->dst = dst_clone(&rt->u.dst);
579
580 skb_put(skb, length);
581 skb_reset_network_header(skb);
582 iph = ipv6_hdr(skb);
583
584 skb->ip_summed = CHECKSUM_NONE;
585
586 skb->transport_header = skb->network_header;
587 err = memcpy_fromiovecend((void *)iph, from, 0, length);
588 if (err)
589 goto error_fault;
590
591 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS);
592 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
593 dst_output);
594 if (err > 0)
595 err = np->recverr ? net_xmit_errno(err) : 0;
596 if (err)
597 goto error;
598 out:
599 return 0;
600
601 error_fault:
602 err = -EFAULT;
603 kfree_skb(skb);
604 error:
605 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
606 return err;
607 }
608
609 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
610 {
611 struct iovec *iov;
612 u8 __user *type = NULL;
613 u8 __user *code = NULL;
614 #ifdef CONFIG_IPV6_MIP6
615 u8 len = 0;
616 #endif
617 int probed = 0;
618 int i;
619
620 if (!msg->msg_iov)
621 return 0;
622
623 for (i = 0; i < msg->msg_iovlen; i++) {
624 iov = &msg->msg_iov[i];
625 if (!iov)
626 continue;
627
628 switch (fl->proto) {
629 case IPPROTO_ICMPV6:
630 /* check if one-byte field is readable or not. */
631 if (iov->iov_base && iov->iov_len < 1)
632 break;
633
634 if (!type) {
635 type = iov->iov_base;
636 /* check if code field is readable or not. */
637 if (iov->iov_len > 1)
638 code = type + 1;
639 } else if (!code)
640 code = iov->iov_base;
641
642 if (type && code) {
643 if (get_user(fl->fl_icmp_type, type) ||
644 get_user(fl->fl_icmp_code, code))
645 return -EFAULT;
646 probed = 1;
647 }
648 break;
649 #ifdef CONFIG_IPV6_MIP6
650 case IPPROTO_MH:
651 if (iov->iov_base && iov->iov_len < 1)
652 break;
653 /* check if type field is readable or not. */
654 if (iov->iov_len > 2 - len) {
655 u8 __user *p = iov->iov_base;
656 if (get_user(fl->fl_mh_type, &p[2 - len]))
657 return -EFAULT;
658 probed = 1;
659 } else
660 len += iov->iov_len;
661
662 break;
663 #endif
664 default:
665 probed = 1;
666 break;
667 }
668 if (probed)
669 break;
670 }
671 return 0;
672 }
673
674 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
675 struct msghdr *msg, size_t len)
676 {
677 struct ipv6_txoptions opt_space;
678 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
679 struct in6_addr *daddr, *final_p = NULL, final;
680 struct inet_sock *inet = inet_sk(sk);
681 struct ipv6_pinfo *np = inet6_sk(sk);
682 struct raw6_sock *rp = raw6_sk(sk);
683 struct ipv6_txoptions *opt = NULL;
684 struct ip6_flowlabel *flowlabel = NULL;
685 struct dst_entry *dst = NULL;
686 struct flowi fl;
687 int addr_len = msg->msg_namelen;
688 int hlimit = -1;
689 int tclass = -1;
690 u16 proto;
691 int err;
692
693 /* Rough check on arithmetic overflow,
694 better check is made in ip6_append_data().
695 */
696 if (len > INT_MAX)
697 return -EMSGSIZE;
698
699 /* Mirror BSD error message compatibility */
700 if (msg->msg_flags & MSG_OOB)
701 return -EOPNOTSUPP;
702
703 /*
704 * Get and verify the address.
705 */
706 memset(&fl, 0, sizeof(fl));
707
708 if (sin6) {
709 if (addr_len < SIN6_LEN_RFC2133)
710 return -EINVAL;
711
712 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
713 return(-EAFNOSUPPORT);
714
715 /* port is the proto value [0..255] carried in nexthdr */
716 proto = ntohs(sin6->sin6_port);
717
718 if (!proto)
719 proto = inet->num;
720 else if (proto != inet->num)
721 return(-EINVAL);
722
723 if (proto > 255)
724 return(-EINVAL);
725
726 daddr = &sin6->sin6_addr;
727 if (np->sndflow) {
728 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
729 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
730 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
731 if (flowlabel == NULL)
732 return -EINVAL;
733 daddr = &flowlabel->dst;
734 }
735 }
736
737 /*
738 * Otherwise it will be difficult to maintain
739 * sk->sk_dst_cache.
740 */
741 if (sk->sk_state == TCP_ESTABLISHED &&
742 ipv6_addr_equal(daddr, &np->daddr))
743 daddr = &np->daddr;
744
745 if (addr_len >= sizeof(struct sockaddr_in6) &&
746 sin6->sin6_scope_id &&
747 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
748 fl.oif = sin6->sin6_scope_id;
749 } else {
750 if (sk->sk_state != TCP_ESTABLISHED)
751 return -EDESTADDRREQ;
752
753 proto = inet->num;
754 daddr = &np->daddr;
755 fl.fl6_flowlabel = np->flow_label;
756 }
757
758 if (ipv6_addr_any(daddr)) {
759 /*
760 * unspecified destination address
761 * treated as error... is this correct ?
762 */
763 fl6_sock_release(flowlabel);
764 return(-EINVAL);
765 }
766
767 if (fl.oif == 0)
768 fl.oif = sk->sk_bound_dev_if;
769
770 if (msg->msg_controllen) {
771 opt = &opt_space;
772 memset(opt, 0, sizeof(struct ipv6_txoptions));
773 opt->tot_len = sizeof(struct ipv6_txoptions);
774
775 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
776 if (err < 0) {
777 fl6_sock_release(flowlabel);
778 return err;
779 }
780 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
781 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
782 if (flowlabel == NULL)
783 return -EINVAL;
784 }
785 if (!(opt->opt_nflen|opt->opt_flen))
786 opt = NULL;
787 }
788 if (opt == NULL)
789 opt = np->opt;
790 if (flowlabel)
791 opt = fl6_merge_options(&opt_space, flowlabel, opt);
792 opt = ipv6_fixup_options(&opt_space, opt);
793
794 fl.proto = proto;
795 err = rawv6_probe_proto_opt(&fl, msg);
796 if (err)
797 goto out;
798
799 ipv6_addr_copy(&fl.fl6_dst, daddr);
800 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
801 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
802
803 /* merge ip6_build_xmit from ip6_output */
804 if (opt && opt->srcrt) {
805 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
806 ipv6_addr_copy(&final, &fl.fl6_dst);
807 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
808 final_p = &final;
809 }
810
811 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
812 fl.oif = np->mcast_oif;
813 security_sk_classify_flow(sk, &fl);
814
815 err = ip6_dst_lookup(sk, &dst, &fl);
816 if (err)
817 goto out;
818 if (final_p)
819 ipv6_addr_copy(&fl.fl6_dst, final_p);
820
821 if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) {
822 if (err == -EREMOTE)
823 err = ip6_dst_blackhole(sk, &dst, &fl);
824 if (err < 0)
825 goto out;
826 }
827
828 if (hlimit < 0) {
829 if (ipv6_addr_is_multicast(&fl.fl6_dst))
830 hlimit = np->mcast_hops;
831 else
832 hlimit = np->hop_limit;
833 if (hlimit < 0)
834 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
835 if (hlimit < 0)
836 hlimit = ipv6_get_hoplimit(dst->dev);
837 }
838
839 if (tclass < 0) {
840 tclass = np->tclass;
841 if (tclass < 0)
842 tclass = 0;
843 }
844
845 if (msg->msg_flags&MSG_CONFIRM)
846 goto do_confirm;
847
848 back_from_confirm:
849 if (inet->hdrincl) {
850 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags);
851 } else {
852 lock_sock(sk);
853 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
854 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst,
855 msg->msg_flags);
856
857 if (err)
858 ip6_flush_pending_frames(sk);
859 else if (!(msg->msg_flags & MSG_MORE))
860 err = rawv6_push_pending_frames(sk, &fl, rp);
861 }
862 done:
863 dst_release(dst);
864 if (!inet->hdrincl)
865 release_sock(sk);
866 out:
867 fl6_sock_release(flowlabel);
868 return err<0?err:len;
869 do_confirm:
870 dst_confirm(dst);
871 if (!(msg->msg_flags & MSG_PROBE) || len)
872 goto back_from_confirm;
873 err = 0;
874 goto done;
875 }
876
877 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
878 char __user *optval, int optlen)
879 {
880 switch (optname) {
881 case ICMPV6_FILTER:
882 if (optlen > sizeof(struct icmp6_filter))
883 optlen = sizeof(struct icmp6_filter);
884 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
885 return -EFAULT;
886 return 0;
887 default:
888 return -ENOPROTOOPT;
889 }
890
891 return 0;
892 }
893
894 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
895 char __user *optval, int __user *optlen)
896 {
897 int len;
898
899 switch (optname) {
900 case ICMPV6_FILTER:
901 if (get_user(len, optlen))
902 return -EFAULT;
903 if (len < 0)
904 return -EINVAL;
905 if (len > sizeof(struct icmp6_filter))
906 len = sizeof(struct icmp6_filter);
907 if (put_user(len, optlen))
908 return -EFAULT;
909 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
910 return -EFAULT;
911 return 0;
912 default:
913 return -ENOPROTOOPT;
914 }
915
916 return 0;
917 }
918
919
920 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
921 char __user *optval, int optlen)
922 {
923 struct raw6_sock *rp = raw6_sk(sk);
924 int val;
925
926 if (get_user(val, (int __user *)optval))
927 return -EFAULT;
928
929 switch (optname) {
930 case IPV6_CHECKSUM:
931 /* You may get strange result with a positive odd offset;
932 RFC2292bis agrees with me. */
933 if (val > 0 && (val&1))
934 return(-EINVAL);
935 if (val < 0) {
936 rp->checksum = 0;
937 } else {
938 rp->checksum = 1;
939 rp->offset = val;
940 }
941
942 return 0;
943 break;
944
945 default:
946 return(-ENOPROTOOPT);
947 }
948 }
949
950 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
951 char __user *optval, int optlen)
952 {
953 switch(level) {
954 case SOL_RAW:
955 break;
956
957 case SOL_ICMPV6:
958 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
959 return -EOPNOTSUPP;
960 return rawv6_seticmpfilter(sk, level, optname, optval,
961 optlen);
962 case SOL_IPV6:
963 if (optname == IPV6_CHECKSUM)
964 break;
965 default:
966 return ipv6_setsockopt(sk, level, optname, optval,
967 optlen);
968 }
969
970 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
971 }
972
973 #ifdef CONFIG_COMPAT
974 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
975 char __user *optval, int optlen)
976 {
977 switch (level) {
978 case SOL_RAW:
979 break;
980 case SOL_ICMPV6:
981 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
982 return -EOPNOTSUPP;
983 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
984 case SOL_IPV6:
985 if (optname == IPV6_CHECKSUM)
986 break;
987 default:
988 return compat_ipv6_setsockopt(sk, level, optname,
989 optval, optlen);
990 }
991 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
992 }
993 #endif
994
995 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
996 char __user *optval, int __user *optlen)
997 {
998 struct raw6_sock *rp = raw6_sk(sk);
999 int val, len;
1000
1001 if (get_user(len,optlen))
1002 return -EFAULT;
1003
1004 switch (optname) {
1005 case IPV6_CHECKSUM:
1006 if (rp->checksum == 0)
1007 val = -1;
1008 else
1009 val = rp->offset;
1010 break;
1011
1012 default:
1013 return -ENOPROTOOPT;
1014 }
1015
1016 len = min_t(unsigned int, sizeof(int), len);
1017
1018 if (put_user(len, optlen))
1019 return -EFAULT;
1020 if (copy_to_user(optval,&val,len))
1021 return -EFAULT;
1022 return 0;
1023 }
1024
1025 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1026 char __user *optval, int __user *optlen)
1027 {
1028 switch(level) {
1029 case SOL_RAW:
1030 break;
1031
1032 case SOL_ICMPV6:
1033 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1034 return -EOPNOTSUPP;
1035 return rawv6_geticmpfilter(sk, level, optname, optval,
1036 optlen);
1037 case SOL_IPV6:
1038 if (optname == IPV6_CHECKSUM)
1039 break;
1040 default:
1041 return ipv6_getsockopt(sk, level, optname, optval,
1042 optlen);
1043 }
1044
1045 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1046 }
1047
1048 #ifdef CONFIG_COMPAT
1049 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1050 char __user *optval, int __user *optlen)
1051 {
1052 switch (level) {
1053 case SOL_RAW:
1054 break;
1055 case SOL_ICMPV6:
1056 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1057 return -EOPNOTSUPP;
1058 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1059 case SOL_IPV6:
1060 if (optname == IPV6_CHECKSUM)
1061 break;
1062 default:
1063 return compat_ipv6_getsockopt(sk, level, optname,
1064 optval, optlen);
1065 }
1066 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1067 }
1068 #endif
1069
1070 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1071 {
1072 switch(cmd) {
1073 case SIOCOUTQ:
1074 {
1075 int amount = atomic_read(&sk->sk_wmem_alloc);
1076 return put_user(amount, (int __user *)arg);
1077 }
1078 case SIOCINQ:
1079 {
1080 struct sk_buff *skb;
1081 int amount = 0;
1082
1083 spin_lock_bh(&sk->sk_receive_queue.lock);
1084 skb = skb_peek(&sk->sk_receive_queue);
1085 if (skb != NULL)
1086 amount = skb->tail - skb->transport_header;
1087 spin_unlock_bh(&sk->sk_receive_queue.lock);
1088 return put_user(amount, (int __user *)arg);
1089 }
1090
1091 default:
1092 return -ENOIOCTLCMD;
1093 }
1094 }
1095
1096 static void rawv6_close(struct sock *sk, long timeout)
1097 {
1098 if (inet_sk(sk)->num == IPPROTO_RAW)
1099 ip6_ra_control(sk, -1, NULL);
1100
1101 sk_common_release(sk);
1102 }
1103
1104 static int rawv6_init_sk(struct sock *sk)
1105 {
1106 struct raw6_sock *rp = raw6_sk(sk);
1107
1108 switch (inet_sk(sk)->num) {
1109 case IPPROTO_ICMPV6:
1110 rp->checksum = 1;
1111 rp->offset = 2;
1112 break;
1113 case IPPROTO_MH:
1114 rp->checksum = 1;
1115 rp->offset = 4;
1116 break;
1117 default:
1118 break;
1119 }
1120 return(0);
1121 }
1122
1123 struct proto rawv6_prot = {
1124 .name = "RAWv6",
1125 .owner = THIS_MODULE,
1126 .close = rawv6_close,
1127 .connect = ip6_datagram_connect,
1128 .disconnect = udp_disconnect,
1129 .ioctl = rawv6_ioctl,
1130 .init = rawv6_init_sk,
1131 .destroy = inet6_destroy_sock,
1132 .setsockopt = rawv6_setsockopt,
1133 .getsockopt = rawv6_getsockopt,
1134 .sendmsg = rawv6_sendmsg,
1135 .recvmsg = rawv6_recvmsg,
1136 .bind = rawv6_bind,
1137 .backlog_rcv = rawv6_rcv_skb,
1138 .hash = raw_v6_hash,
1139 .unhash = raw_v6_unhash,
1140 .obj_size = sizeof(struct raw6_sock),
1141 #ifdef CONFIG_COMPAT
1142 .compat_setsockopt = compat_rawv6_setsockopt,
1143 .compat_getsockopt = compat_rawv6_getsockopt,
1144 #endif
1145 };
1146
1147 #ifdef CONFIG_PROC_FS
1148 struct raw6_iter_state {
1149 int bucket;
1150 };
1151
1152 #define raw6_seq_private(seq) ((struct raw6_iter_state *)(seq)->private)
1153
1154 static struct sock *raw6_get_first(struct seq_file *seq)
1155 {
1156 struct sock *sk;
1157 struct hlist_node *node;
1158 struct raw6_iter_state* state = raw6_seq_private(seq);
1159
1160 for (state->bucket = 0; state->bucket < RAWV6_HTABLE_SIZE; ++state->bucket)
1161 sk_for_each(sk, node, &raw_v6_htable[state->bucket])
1162 if (sk->sk_family == PF_INET6)
1163 goto out;
1164 sk = NULL;
1165 out:
1166 return sk;
1167 }
1168
1169 static struct sock *raw6_get_next(struct seq_file *seq, struct sock *sk)
1170 {
1171 struct raw6_iter_state* state = raw6_seq_private(seq);
1172
1173 do {
1174 sk = sk_next(sk);
1175 try_again:
1176 ;
1177 } while (sk && sk->sk_family != PF_INET6);
1178
1179 if (!sk && ++state->bucket < RAWV6_HTABLE_SIZE) {
1180 sk = sk_head(&raw_v6_htable[state->bucket]);
1181 goto try_again;
1182 }
1183 return sk;
1184 }
1185
1186 static struct sock *raw6_get_idx(struct seq_file *seq, loff_t pos)
1187 {
1188 struct sock *sk = raw6_get_first(seq);
1189 if (sk)
1190 while (pos && (sk = raw6_get_next(seq, sk)) != NULL)
1191 --pos;
1192 return pos ? NULL : sk;
1193 }
1194
1195 static void *raw6_seq_start(struct seq_file *seq, loff_t *pos)
1196 {
1197 read_lock(&raw_v6_lock);
1198 return *pos ? raw6_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
1199 }
1200
1201 static void *raw6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1202 {
1203 struct sock *sk;
1204
1205 if (v == SEQ_START_TOKEN)
1206 sk = raw6_get_first(seq);
1207 else
1208 sk = raw6_get_next(seq, v);
1209 ++*pos;
1210 return sk;
1211 }
1212
1213 static void raw6_seq_stop(struct seq_file *seq, void *v)
1214 {
1215 read_unlock(&raw_v6_lock);
1216 }
1217
1218 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1219 {
1220 struct ipv6_pinfo *np = inet6_sk(sp);
1221 struct in6_addr *dest, *src;
1222 __u16 destp, srcp;
1223
1224 dest = &np->daddr;
1225 src = &np->rcv_saddr;
1226 destp = 0;
1227 srcp = inet_sk(sp)->num;
1228 seq_printf(seq,
1229 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1230 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1231 i,
1232 src->s6_addr32[0], src->s6_addr32[1],
1233 src->s6_addr32[2], src->s6_addr32[3], srcp,
1234 dest->s6_addr32[0], dest->s6_addr32[1],
1235 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1236 sp->sk_state,
1237 atomic_read(&sp->sk_wmem_alloc),
1238 atomic_read(&sp->sk_rmem_alloc),
1239 0, 0L, 0,
1240 sock_i_uid(sp), 0,
1241 sock_i_ino(sp),
1242 atomic_read(&sp->sk_refcnt), sp);
1243 }
1244
1245 static int raw6_seq_show(struct seq_file *seq, void *v)
1246 {
1247 if (v == SEQ_START_TOKEN)
1248 seq_printf(seq,
1249 " sl "
1250 "local_address "
1251 "remote_address "
1252 "st tx_queue rx_queue tr tm->when retrnsmt"
1253 " uid timeout inode\n");
1254 else
1255 raw6_sock_seq_show(seq, v, raw6_seq_private(seq)->bucket);
1256 return 0;
1257 }
1258
1259 static struct seq_operations raw6_seq_ops = {
1260 .start = raw6_seq_start,
1261 .next = raw6_seq_next,
1262 .stop = raw6_seq_stop,
1263 .show = raw6_seq_show,
1264 };
1265
1266 static int raw6_seq_open(struct inode *inode, struct file *file)
1267 {
1268 struct seq_file *seq;
1269 int rc = -ENOMEM;
1270 struct raw6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1271 if (!s)
1272 goto out;
1273 rc = seq_open(file, &raw6_seq_ops);
1274 if (rc)
1275 goto out_kfree;
1276 seq = file->private_data;
1277 seq->private = s;
1278 out:
1279 return rc;
1280 out_kfree:
1281 kfree(s);
1282 goto out;
1283 }
1284
1285 static const struct file_operations raw6_seq_fops = {
1286 .owner = THIS_MODULE,
1287 .open = raw6_seq_open,
1288 .read = seq_read,
1289 .llseek = seq_lseek,
1290 .release = seq_release_private,
1291 };
1292
1293 int __init raw6_proc_init(void)
1294 {
1295 if (!proc_net_fops_create("raw6", S_IRUGO, &raw6_seq_fops))
1296 return -ENOMEM;
1297 return 0;
1298 }
1299
1300 void raw6_proc_exit(void)
1301 {
1302 proc_net_remove("raw6");
1303 }
1304 #endif /* CONFIG_PROC_FS */
kernel-based virtual machine