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[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 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
141 static int (*mh_filter)(struct sock *sock, struct sk_buff *skb);
142
143 int rawv6_mh_filter_register(int (*filter)(struct sock *sock,
144 struct sk_buff *skb))
145 {
146 rcu_assign_pointer(mh_filter, filter);
147 return 0;
148 }
149 EXPORT_SYMBOL(rawv6_mh_filter_register);
150
151 int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock,
152 struct sk_buff *skb))
153 {
154 rcu_assign_pointer(mh_filter, NULL);
155 synchronize_rcu();
156 return 0;
157 }
158 EXPORT_SYMBOL(rawv6_mh_filter_unregister);
159
160 #endif
161
162 /*
163 * demultiplex raw sockets.
164 * (should consider queueing the skb in the sock receive_queue
165 * without calling rawv6.c)
166 *
167 * Caller owns SKB so we must make clones.
168 */
169 int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
170 {
171 struct in6_addr *saddr;
172 struct in6_addr *daddr;
173 struct sock *sk;
174 int delivered = 0;
175 __u8 hash;
176
177 saddr = &ipv6_hdr(skb)->saddr;
178 daddr = saddr + 1;
179
180 hash = nexthdr & (MAX_INET_PROTOS - 1);
181
182 read_lock(&raw_v6_lock);
183 sk = sk_head(&raw_v6_htable[hash]);
184
185 /*
186 * The first socket found will be delivered after
187 * delivery to transport protocols.
188 */
189
190 if (sk == NULL)
191 goto out;
192
193 sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
194
195 while (sk) {
196 int filtered;
197
198 delivered = 1;
199 switch (nexthdr) {
200 case IPPROTO_ICMPV6:
201 filtered = icmpv6_filter(sk, skb);
202 break;
203
204 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
205 case IPPROTO_MH:
206 {
207 /* XXX: To validate MH only once for each packet,
208 * this is placed here. It should be after checking
209 * xfrm policy, however it doesn't. The checking xfrm
210 * policy is placed in rawv6_rcv() because it is
211 * required for each socket.
212 */
213 int (*filter)(struct sock *sock, struct sk_buff *skb);
214
215 filter = rcu_dereference(mh_filter);
216 filtered = filter ? filter(sk, skb) : 0;
217 break;
218 }
219 #endif
220 default:
221 filtered = 0;
222 break;
223 }
224
225 if (filtered < 0)
226 break;
227 if (filtered == 0) {
228 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
229
230 /* Not releasing hash table! */
231 if (clone) {
232 nf_reset(clone);
233 rawv6_rcv(sk, clone);
234 }
235 }
236 sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr,
237 IP6CB(skb)->iif);
238 }
239 out:
240 read_unlock(&raw_v6_lock);
241 return delivered;
242 }
243
244 /* This cleans up af_inet6 a bit. -DaveM */
245 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
246 {
247 struct inet_sock *inet = inet_sk(sk);
248 struct ipv6_pinfo *np = inet6_sk(sk);
249 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
250 __be32 v4addr = 0;
251 int addr_type;
252 int err;
253
254 if (addr_len < SIN6_LEN_RFC2133)
255 return -EINVAL;
256 addr_type = ipv6_addr_type(&addr->sin6_addr);
257
258 /* Raw sockets are IPv6 only */
259 if (addr_type == IPV6_ADDR_MAPPED)
260 return(-EADDRNOTAVAIL);
261
262 lock_sock(sk);
263
264 err = -EINVAL;
265 if (sk->sk_state != TCP_CLOSE)
266 goto out;
267
268 /* Check if the address belongs to the host. */
269 if (addr_type != IPV6_ADDR_ANY) {
270 struct net_device *dev = NULL;
271
272 if (addr_type & IPV6_ADDR_LINKLOCAL) {
273 if (addr_len >= sizeof(struct sockaddr_in6) &&
274 addr->sin6_scope_id) {
275 /* Override any existing binding, if another
276 * one is supplied by user.
277 */
278 sk->sk_bound_dev_if = addr->sin6_scope_id;
279 }
280
281 /* Binding to link-local address requires an interface */
282 if (!sk->sk_bound_dev_if)
283 goto out;
284
285 dev = dev_get_by_index(sk->sk_bound_dev_if);
286 if (!dev) {
287 err = -ENODEV;
288 goto out;
289 }
290 }
291
292 /* ipv4 addr of the socket is invalid. Only the
293 * unspecified and mapped address have a v4 equivalent.
294 */
295 v4addr = LOOPBACK4_IPV6;
296 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
297 err = -EADDRNOTAVAIL;
298 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
299 if (dev)
300 dev_put(dev);
301 goto out;
302 }
303 }
304 if (dev)
305 dev_put(dev);
306 }
307
308 inet->rcv_saddr = inet->saddr = v4addr;
309 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
310 if (!(addr_type & IPV6_ADDR_MULTICAST))
311 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
312 err = 0;
313 out:
314 release_sock(sk);
315 return err;
316 }
317
318 void rawv6_err(struct sock *sk, struct sk_buff *skb,
319 struct inet6_skb_parm *opt,
320 int type, int code, int offset, __be32 info)
321 {
322 struct inet_sock *inet = inet_sk(sk);
323 struct ipv6_pinfo *np = inet6_sk(sk);
324 int err;
325 int harderr;
326
327 /* Report error on raw socket, if:
328 1. User requested recverr.
329 2. Socket is connected (otherwise the error indication
330 is useless without recverr and error is hard.
331 */
332 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
333 return;
334
335 harderr = icmpv6_err_convert(type, code, &err);
336 if (type == ICMPV6_PKT_TOOBIG)
337 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
338
339 if (np->recverr) {
340 u8 *payload = skb->data;
341 if (!inet->hdrincl)
342 payload += offset;
343 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
344 }
345
346 if (np->recverr || harderr) {
347 sk->sk_err = err;
348 sk->sk_error_report(sk);
349 }
350 }
351
352 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
353 {
354 if ((raw6_sk(sk)->checksum || sk->sk_filter) &&
355 skb_checksum_complete(skb)) {
356 /* FIXME: increment a raw6 drops counter here */
357 kfree_skb(skb);
358 return 0;
359 }
360
361 /* Charge it to the socket. */
362 if (sock_queue_rcv_skb(sk,skb)<0) {
363 /* FIXME: increment a raw6 drops counter here */
364 kfree_skb(skb);
365 return 0;
366 }
367
368 return 0;
369 }
370
371 /*
372 * This is next to useless...
373 * if we demultiplex in network layer we don't need the extra call
374 * just to queue the skb...
375 * maybe we could have the network decide upon a hint if it
376 * should call raw_rcv for demultiplexing
377 */
378 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
379 {
380 struct inet_sock *inet = inet_sk(sk);
381 struct raw6_sock *rp = raw6_sk(sk);
382
383 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
384 kfree_skb(skb);
385 return NET_RX_DROP;
386 }
387
388 if (!rp->checksum)
389 skb->ip_summed = CHECKSUM_UNNECESSARY;
390
391 if (skb->ip_summed == CHECKSUM_COMPLETE) {
392 skb_postpull_rcsum(skb, skb_network_header(skb),
393 skb_network_header_len(skb));
394 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
395 &ipv6_hdr(skb)->daddr,
396 skb->len, inet->num, skb->csum))
397 skb->ip_summed = CHECKSUM_UNNECESSARY;
398 }
399 if (!skb_csum_unnecessary(skb))
400 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
401 &ipv6_hdr(skb)->daddr,
402 skb->len,
403 inet->num, 0));
404
405 if (inet->hdrincl) {
406 if (skb_checksum_complete(skb)) {
407 /* FIXME: increment a raw6 drops counter here */
408 kfree_skb(skb);
409 return 0;
410 }
411 }
412
413 rawv6_rcv_skb(sk, skb);
414 return 0;
415 }
416
417
418 /*
419 * This should be easy, if there is something there
420 * we return it, otherwise we block.
421 */
422
423 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
424 struct msghdr *msg, size_t len,
425 int noblock, int flags, int *addr_len)
426 {
427 struct ipv6_pinfo *np = inet6_sk(sk);
428 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
429 struct sk_buff *skb;
430 size_t copied;
431 int err;
432
433 if (flags & MSG_OOB)
434 return -EOPNOTSUPP;
435
436 if (addr_len)
437 *addr_len=sizeof(*sin6);
438
439 if (flags & MSG_ERRQUEUE)
440 return ipv6_recv_error(sk, msg, len);
441
442 skb = skb_recv_datagram(sk, flags, noblock, &err);
443 if (!skb)
444 goto out;
445
446 copied = skb->len;
447 if (copied > len) {
448 copied = len;
449 msg->msg_flags |= MSG_TRUNC;
450 }
451
452 if (skb_csum_unnecessary(skb)) {
453 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
454 } else if (msg->msg_flags&MSG_TRUNC) {
455 if (__skb_checksum_complete(skb))
456 goto csum_copy_err;
457 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
458 } else {
459 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
460 if (err == -EINVAL)
461 goto csum_copy_err;
462 }
463 if (err)
464 goto out_free;
465
466 /* Copy the address. */
467 if (sin6) {
468 sin6->sin6_family = AF_INET6;
469 sin6->sin6_port = 0;
470 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
471 sin6->sin6_flowinfo = 0;
472 sin6->sin6_scope_id = 0;
473 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
474 sin6->sin6_scope_id = IP6CB(skb)->iif;
475 }
476
477 sock_recv_timestamp(msg, sk, skb);
478
479 if (np->rxopt.all)
480 datagram_recv_ctl(sk, msg, skb);
481
482 err = copied;
483 if (flags & MSG_TRUNC)
484 err = skb->len;
485
486 out_free:
487 skb_free_datagram(sk, skb);
488 out:
489 return err;
490
491 csum_copy_err:
492 skb_kill_datagram(sk, skb, flags);
493
494 /* Error for blocking case is chosen to masquerade
495 as some normal condition.
496 */
497 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
498 /* FIXME: increment a raw6 drops counter here */
499 goto out;
500 }
501
502 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
503 struct raw6_sock *rp)
504 {
505 struct sk_buff *skb;
506 int err = 0;
507 int offset;
508 int len;
509 int total_len;
510 __wsum tmp_csum;
511 __sum16 csum;
512
513 if (!rp->checksum)
514 goto send;
515
516 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
517 goto out;
518
519 offset = rp->offset;
520 total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) -
521 skb->data);
522 if (offset >= total_len - 1) {
523 err = -EINVAL;
524 ip6_flush_pending_frames(sk);
525 goto out;
526 }
527
528 /* should be check HW csum miyazawa */
529 if (skb_queue_len(&sk->sk_write_queue) == 1) {
530 /*
531 * Only one fragment on the socket.
532 */
533 tmp_csum = skb->csum;
534 } else {
535 struct sk_buff *csum_skb = NULL;
536 tmp_csum = 0;
537
538 skb_queue_walk(&sk->sk_write_queue, skb) {
539 tmp_csum = csum_add(tmp_csum, skb->csum);
540
541 if (csum_skb)
542 continue;
543
544 len = skb->len - skb_transport_offset(skb);
545 if (offset >= len) {
546 offset -= len;
547 continue;
548 }
549
550 csum_skb = skb;
551 }
552
553 skb = csum_skb;
554 }
555
556 offset += skb_transport_offset(skb);
557 if (skb_copy_bits(skb, offset, &csum, 2))
558 BUG();
559
560 /* in case cksum was not initialized */
561 if (unlikely(csum))
562 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
563
564 csum = csum_ipv6_magic(&fl->fl6_src,
565 &fl->fl6_dst,
566 total_len, fl->proto, tmp_csum);
567
568 if (csum == 0 && fl->proto == IPPROTO_UDP)
569 csum = CSUM_MANGLED_0;
570
571 if (skb_store_bits(skb, offset, &csum, 2))
572 BUG();
573
574 send:
575 err = ip6_push_pending_frames(sk);
576 out:
577 return err;
578 }
579
580 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
581 struct flowi *fl, struct rt6_info *rt,
582 unsigned int flags)
583 {
584 struct ipv6_pinfo *np = inet6_sk(sk);
585 struct ipv6hdr *iph;
586 struct sk_buff *skb;
587 unsigned int hh_len;
588 int err;
589
590 if (length > rt->u.dst.dev->mtu) {
591 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu);
592 return -EMSGSIZE;
593 }
594 if (flags&MSG_PROBE)
595 goto out;
596
597 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
598
599 skb = sock_alloc_send_skb(sk, length+hh_len+15,
600 flags&MSG_DONTWAIT, &err);
601 if (skb == NULL)
602 goto error;
603 skb_reserve(skb, hh_len);
604
605 skb->priority = sk->sk_priority;
606 skb->dst = dst_clone(&rt->u.dst);
607
608 skb_put(skb, length);
609 skb_reset_network_header(skb);
610 iph = ipv6_hdr(skb);
611
612 skb->ip_summed = CHECKSUM_NONE;
613
614 skb->transport_header = skb->network_header;
615 err = memcpy_fromiovecend((void *)iph, from, 0, length);
616 if (err)
617 goto error_fault;
618
619 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS);
620 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
621 dst_output);
622 if (err > 0)
623 err = np->recverr ? net_xmit_errno(err) : 0;
624 if (err)
625 goto error;
626 out:
627 return 0;
628
629 error_fault:
630 err = -EFAULT;
631 kfree_skb(skb);
632 error:
633 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
634 return err;
635 }
636
637 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
638 {
639 struct iovec *iov;
640 u8 __user *type = NULL;
641 u8 __user *code = NULL;
642 u8 len = 0;
643 int probed = 0;
644 int i;
645
646 if (!msg->msg_iov)
647 return 0;
648
649 for (i = 0; i < msg->msg_iovlen; i++) {
650 iov = &msg->msg_iov[i];
651 if (!iov)
652 continue;
653
654 switch (fl->proto) {
655 case IPPROTO_ICMPV6:
656 /* check if one-byte field is readable or not. */
657 if (iov->iov_base && iov->iov_len < 1)
658 break;
659
660 if (!type) {
661 type = iov->iov_base;
662 /* check if code field is readable or not. */
663 if (iov->iov_len > 1)
664 code = type + 1;
665 } else if (!code)
666 code = iov->iov_base;
667
668 if (type && code) {
669 if (get_user(fl->fl_icmp_type, type) ||
670 get_user(fl->fl_icmp_code, code))
671 return -EFAULT;
672 probed = 1;
673 }
674 break;
675 case IPPROTO_MH:
676 if (iov->iov_base && iov->iov_len < 1)
677 break;
678 /* check if type field is readable or not. */
679 if (iov->iov_len > 2 - len) {
680 u8 __user *p = iov->iov_base;
681 if (get_user(fl->fl_mh_type, &p[2 - len]))
682 return -EFAULT;
683 probed = 1;
684 } else
685 len += iov->iov_len;
686
687 break;
688 default:
689 probed = 1;
690 break;
691 }
692 if (probed)
693 break;
694 }
695 return 0;
696 }
697
698 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
699 struct msghdr *msg, size_t len)
700 {
701 struct ipv6_txoptions opt_space;
702 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
703 struct in6_addr *daddr, *final_p = NULL, final;
704 struct inet_sock *inet = inet_sk(sk);
705 struct ipv6_pinfo *np = inet6_sk(sk);
706 struct raw6_sock *rp = raw6_sk(sk);
707 struct ipv6_txoptions *opt = NULL;
708 struct ip6_flowlabel *flowlabel = NULL;
709 struct dst_entry *dst = NULL;
710 struct flowi fl;
711 int addr_len = msg->msg_namelen;
712 int hlimit = -1;
713 int tclass = -1;
714 u16 proto;
715 int err;
716
717 /* Rough check on arithmetic overflow,
718 better check is made in ip6_append_data().
719 */
720 if (len > INT_MAX)
721 return -EMSGSIZE;
722
723 /* Mirror BSD error message compatibility */
724 if (msg->msg_flags & MSG_OOB)
725 return -EOPNOTSUPP;
726
727 /*
728 * Get and verify the address.
729 */
730 memset(&fl, 0, sizeof(fl));
731
732 if (sin6) {
733 if (addr_len < SIN6_LEN_RFC2133)
734 return -EINVAL;
735
736 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
737 return(-EAFNOSUPPORT);
738
739 /* port is the proto value [0..255] carried in nexthdr */
740 proto = ntohs(sin6->sin6_port);
741
742 if (!proto)
743 proto = inet->num;
744 else if (proto != inet->num)
745 return(-EINVAL);
746
747 if (proto > 255)
748 return(-EINVAL);
749
750 daddr = &sin6->sin6_addr;
751 if (np->sndflow) {
752 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
753 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
754 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
755 if (flowlabel == NULL)
756 return -EINVAL;
757 daddr = &flowlabel->dst;
758 }
759 }
760
761 /*
762 * Otherwise it will be difficult to maintain
763 * sk->sk_dst_cache.
764 */
765 if (sk->sk_state == TCP_ESTABLISHED &&
766 ipv6_addr_equal(daddr, &np->daddr))
767 daddr = &np->daddr;
768
769 if (addr_len >= sizeof(struct sockaddr_in6) &&
770 sin6->sin6_scope_id &&
771 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
772 fl.oif = sin6->sin6_scope_id;
773 } else {
774 if (sk->sk_state != TCP_ESTABLISHED)
775 return -EDESTADDRREQ;
776
777 proto = inet->num;
778 daddr = &np->daddr;
779 fl.fl6_flowlabel = np->flow_label;
780 }
781
782 if (ipv6_addr_any(daddr)) {
783 /*
784 * unspecified destination address
785 * treated as error... is this correct ?
786 */
787 fl6_sock_release(flowlabel);
788 return(-EINVAL);
789 }
790
791 if (fl.oif == 0)
792 fl.oif = sk->sk_bound_dev_if;
793
794 if (msg->msg_controllen) {
795 opt = &opt_space;
796 memset(opt, 0, sizeof(struct ipv6_txoptions));
797 opt->tot_len = sizeof(struct ipv6_txoptions);
798
799 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
800 if (err < 0) {
801 fl6_sock_release(flowlabel);
802 return err;
803 }
804 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
805 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
806 if (flowlabel == NULL)
807 return -EINVAL;
808 }
809 if (!(opt->opt_nflen|opt->opt_flen))
810 opt = NULL;
811 }
812 if (opt == NULL)
813 opt = np->opt;
814 if (flowlabel)
815 opt = fl6_merge_options(&opt_space, flowlabel, opt);
816 opt = ipv6_fixup_options(&opt_space, opt);
817
818 fl.proto = proto;
819 err = rawv6_probe_proto_opt(&fl, msg);
820 if (err)
821 goto out;
822
823 ipv6_addr_copy(&fl.fl6_dst, daddr);
824 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
825 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
826
827 /* merge ip6_build_xmit from ip6_output */
828 if (opt && opt->srcrt) {
829 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
830 ipv6_addr_copy(&final, &fl.fl6_dst);
831 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
832 final_p = &final;
833 }
834
835 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
836 fl.oif = np->mcast_oif;
837 security_sk_classify_flow(sk, &fl);
838
839 err = ip6_dst_lookup(sk, &dst, &fl);
840 if (err)
841 goto out;
842 if (final_p)
843 ipv6_addr_copy(&fl.fl6_dst, final_p);
844
845 if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) {
846 if (err == -EREMOTE)
847 err = ip6_dst_blackhole(sk, &dst, &fl);
848 if (err < 0)
849 goto out;
850 }
851
852 if (hlimit < 0) {
853 if (ipv6_addr_is_multicast(&fl.fl6_dst))
854 hlimit = np->mcast_hops;
855 else
856 hlimit = np->hop_limit;
857 if (hlimit < 0)
858 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
859 if (hlimit < 0)
860 hlimit = ipv6_get_hoplimit(dst->dev);
861 }
862
863 if (tclass < 0) {
864 tclass = np->tclass;
865 if (tclass < 0)
866 tclass = 0;
867 }
868
869 if (msg->msg_flags&MSG_CONFIRM)
870 goto do_confirm;
871
872 back_from_confirm:
873 if (inet->hdrincl) {
874 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags);
875 } else {
876 lock_sock(sk);
877 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
878 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst,
879 msg->msg_flags);
880
881 if (err)
882 ip6_flush_pending_frames(sk);
883 else if (!(msg->msg_flags & MSG_MORE))
884 err = rawv6_push_pending_frames(sk, &fl, rp);
885 }
886 done:
887 dst_release(dst);
888 if (!inet->hdrincl)
889 release_sock(sk);
890 out:
891 fl6_sock_release(flowlabel);
892 return err<0?err:len;
893 do_confirm:
894 dst_confirm(dst);
895 if (!(msg->msg_flags & MSG_PROBE) || len)
896 goto back_from_confirm;
897 err = 0;
898 goto done;
899 }
900
901 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
902 char __user *optval, int optlen)
903 {
904 switch (optname) {
905 case ICMPV6_FILTER:
906 if (optlen > sizeof(struct icmp6_filter))
907 optlen = sizeof(struct icmp6_filter);
908 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
909 return -EFAULT;
910 return 0;
911 default:
912 return -ENOPROTOOPT;
913 }
914
915 return 0;
916 }
917
918 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
919 char __user *optval, int __user *optlen)
920 {
921 int len;
922
923 switch (optname) {
924 case ICMPV6_FILTER:
925 if (get_user(len, optlen))
926 return -EFAULT;
927 if (len < 0)
928 return -EINVAL;
929 if (len > sizeof(struct icmp6_filter))
930 len = sizeof(struct icmp6_filter);
931 if (put_user(len, optlen))
932 return -EFAULT;
933 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
934 return -EFAULT;
935 return 0;
936 default:
937 return -ENOPROTOOPT;
938 }
939
940 return 0;
941 }
942
943
944 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
945 char __user *optval, int optlen)
946 {
947 struct raw6_sock *rp = raw6_sk(sk);
948 int val;
949
950 if (get_user(val, (int __user *)optval))
951 return -EFAULT;
952
953 switch (optname) {
954 case IPV6_CHECKSUM:
955 /* You may get strange result with a positive odd offset;
956 RFC2292bis agrees with me. */
957 if (val > 0 && (val&1))
958 return(-EINVAL);
959 if (val < 0) {
960 rp->checksum = 0;
961 } else {
962 rp->checksum = 1;
963 rp->offset = val;
964 }
965
966 return 0;
967 break;
968
969 default:
970 return(-ENOPROTOOPT);
971 }
972 }
973
974 static int 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
981 case SOL_ICMPV6:
982 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
983 return -EOPNOTSUPP;
984 return rawv6_seticmpfilter(sk, level, optname, optval,
985 optlen);
986 case SOL_IPV6:
987 if (optname == IPV6_CHECKSUM)
988 break;
989 default:
990 return ipv6_setsockopt(sk, level, optname, optval,
991 optlen);
992 }
993
994 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
995 }
996
997 #ifdef CONFIG_COMPAT
998 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
999 char __user *optval, int optlen)
1000 {
1001 switch (level) {
1002 case SOL_RAW:
1003 break;
1004 case SOL_ICMPV6:
1005 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1006 return -EOPNOTSUPP;
1007 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1008 case SOL_IPV6:
1009 if (optname == IPV6_CHECKSUM)
1010 break;
1011 default:
1012 return compat_ipv6_setsockopt(sk, level, optname,
1013 optval, optlen);
1014 }
1015 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1016 }
1017 #endif
1018
1019 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1020 char __user *optval, int __user *optlen)
1021 {
1022 struct raw6_sock *rp = raw6_sk(sk);
1023 int val, len;
1024
1025 if (get_user(len,optlen))
1026 return -EFAULT;
1027
1028 switch (optname) {
1029 case IPV6_CHECKSUM:
1030 if (rp->checksum == 0)
1031 val = -1;
1032 else
1033 val = rp->offset;
1034 break;
1035
1036 default:
1037 return -ENOPROTOOPT;
1038 }
1039
1040 len = min_t(unsigned int, sizeof(int), len);
1041
1042 if (put_user(len, optlen))
1043 return -EFAULT;
1044 if (copy_to_user(optval,&val,len))
1045 return -EFAULT;
1046 return 0;
1047 }
1048
1049 static int 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
1056 case SOL_ICMPV6:
1057 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1058 return -EOPNOTSUPP;
1059 return rawv6_geticmpfilter(sk, level, optname, optval,
1060 optlen);
1061 case SOL_IPV6:
1062 if (optname == IPV6_CHECKSUM)
1063 break;
1064 default:
1065 return ipv6_getsockopt(sk, level, optname, optval,
1066 optlen);
1067 }
1068
1069 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1070 }
1071
1072 #ifdef CONFIG_COMPAT
1073 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1074 char __user *optval, int __user *optlen)
1075 {
1076 switch (level) {
1077 case SOL_RAW:
1078 break;
1079 case SOL_ICMPV6:
1080 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
1081 return -EOPNOTSUPP;
1082 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1083 case SOL_IPV6:
1084 if (optname == IPV6_CHECKSUM)
1085 break;
1086 default:
1087 return compat_ipv6_getsockopt(sk, level, optname,
1088 optval, optlen);
1089 }
1090 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1091 }
1092 #endif
1093
1094 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1095 {
1096 switch(cmd) {
1097 case SIOCOUTQ:
1098 {
1099 int amount = atomic_read(&sk->sk_wmem_alloc);
1100 return put_user(amount, (int __user *)arg);
1101 }
1102 case SIOCINQ:
1103 {
1104 struct sk_buff *skb;
1105 int amount = 0;
1106
1107 spin_lock_bh(&sk->sk_receive_queue.lock);
1108 skb = skb_peek(&sk->sk_receive_queue);
1109 if (skb != NULL)
1110 amount = skb->tail - skb->transport_header;
1111 spin_unlock_bh(&sk->sk_receive_queue.lock);
1112 return put_user(amount, (int __user *)arg);
1113 }
1114
1115 default:
1116 return -ENOIOCTLCMD;
1117 }
1118 }
1119
1120 static void rawv6_close(struct sock *sk, long timeout)
1121 {
1122 if (inet_sk(sk)->num == IPPROTO_RAW)
1123 ip6_ra_control(sk, -1, NULL);
1124
1125 sk_common_release(sk);
1126 }
1127
1128 static int rawv6_init_sk(struct sock *sk)
1129 {
1130 struct raw6_sock *rp = raw6_sk(sk);
1131
1132 switch (inet_sk(sk)->num) {
1133 case IPPROTO_ICMPV6:
1134 rp->checksum = 1;
1135 rp->offset = 2;
1136 break;
1137 case IPPROTO_MH:
1138 rp->checksum = 1;
1139 rp->offset = 4;
1140 break;
1141 default:
1142 break;
1143 }
1144 return(0);
1145 }
1146
1147 struct proto rawv6_prot = {
1148 .name = "RAWv6",
1149 .owner = THIS_MODULE,
1150 .close = rawv6_close,
1151 .connect = ip6_datagram_connect,
1152 .disconnect = udp_disconnect,
1153 .ioctl = rawv6_ioctl,
1154 .init = rawv6_init_sk,
1155 .destroy = inet6_destroy_sock,
1156 .setsockopt = rawv6_setsockopt,
1157 .getsockopt = rawv6_getsockopt,
1158 .sendmsg = rawv6_sendmsg,
1159 .recvmsg = rawv6_recvmsg,
1160 .bind = rawv6_bind,
1161 .backlog_rcv = rawv6_rcv_skb,
1162 .hash = raw_v6_hash,
1163 .unhash = raw_v6_unhash,
1164 .obj_size = sizeof(struct raw6_sock),
1165 #ifdef CONFIG_COMPAT
1166 .compat_setsockopt = compat_rawv6_setsockopt,
1167 .compat_getsockopt = compat_rawv6_getsockopt,
1168 #endif
1169 };
1170
1171 #ifdef CONFIG_PROC_FS
1172 struct raw6_iter_state {
1173 int bucket;
1174 };
1175
1176 #define raw6_seq_private(seq) ((struct raw6_iter_state *)(seq)->private)
1177
1178 static struct sock *raw6_get_first(struct seq_file *seq)
1179 {
1180 struct sock *sk;
1181 struct hlist_node *node;
1182 struct raw6_iter_state* state = raw6_seq_private(seq);
1183
1184 for (state->bucket = 0; state->bucket < RAWV6_HTABLE_SIZE; ++state->bucket)
1185 sk_for_each(sk, node, &raw_v6_htable[state->bucket])
1186 if (sk->sk_family == PF_INET6)
1187 goto out;
1188 sk = NULL;
1189 out:
1190 return sk;
1191 }
1192
1193 static struct sock *raw6_get_next(struct seq_file *seq, struct sock *sk)
1194 {
1195 struct raw6_iter_state* state = raw6_seq_private(seq);
1196
1197 do {
1198 sk = sk_next(sk);
1199 try_again:
1200 ;
1201 } while (sk && sk->sk_family != PF_INET6);
1202
1203 if (!sk && ++state->bucket < RAWV6_HTABLE_SIZE) {
1204 sk = sk_head(&raw_v6_htable[state->bucket]);
1205 goto try_again;
1206 }
1207 return sk;
1208 }
1209
1210 static struct sock *raw6_get_idx(struct seq_file *seq, loff_t pos)
1211 {
1212 struct sock *sk = raw6_get_first(seq);
1213 if (sk)
1214 while (pos && (sk = raw6_get_next(seq, sk)) != NULL)
1215 --pos;
1216 return pos ? NULL : sk;
1217 }
1218
1219 static void *raw6_seq_start(struct seq_file *seq, loff_t *pos)
1220 {
1221 read_lock(&raw_v6_lock);
1222 return *pos ? raw6_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
1223 }
1224
1225 static void *raw6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1226 {
1227 struct sock *sk;
1228
1229 if (v == SEQ_START_TOKEN)
1230 sk = raw6_get_first(seq);
1231 else
1232 sk = raw6_get_next(seq, v);
1233 ++*pos;
1234 return sk;
1235 }
1236
1237 static void raw6_seq_stop(struct seq_file *seq, void *v)
1238 {
1239 read_unlock(&raw_v6_lock);
1240 }
1241
1242 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1243 {
1244 struct ipv6_pinfo *np = inet6_sk(sp);
1245 struct in6_addr *dest, *src;
1246 __u16 destp, srcp;
1247
1248 dest = &np->daddr;
1249 src = &np->rcv_saddr;
1250 destp = 0;
1251 srcp = inet_sk(sp)->num;
1252 seq_printf(seq,
1253 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1254 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1255 i,
1256 src->s6_addr32[0], src->s6_addr32[1],
1257 src->s6_addr32[2], src->s6_addr32[3], srcp,
1258 dest->s6_addr32[0], dest->s6_addr32[1],
1259 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1260 sp->sk_state,
1261 atomic_read(&sp->sk_wmem_alloc),
1262 atomic_read(&sp->sk_rmem_alloc),
1263 0, 0L, 0,
1264 sock_i_uid(sp), 0,
1265 sock_i_ino(sp),
1266 atomic_read(&sp->sk_refcnt), sp);
1267 }
1268
1269 static int raw6_seq_show(struct seq_file *seq, void *v)
1270 {
1271 if (v == SEQ_START_TOKEN)
1272 seq_printf(seq,
1273 " sl "
1274 "local_address "
1275 "remote_address "
1276 "st tx_queue rx_queue tr tm->when retrnsmt"
1277 " uid timeout inode\n");
1278 else
1279 raw6_sock_seq_show(seq, v, raw6_seq_private(seq)->bucket);
1280 return 0;
1281 }
1282
1283 static const struct seq_operations raw6_seq_ops = {
1284 .start = raw6_seq_start,
1285 .next = raw6_seq_next,
1286 .stop = raw6_seq_stop,
1287 .show = raw6_seq_show,
1288 };
1289
1290 static int raw6_seq_open(struct inode *inode, struct file *file)
1291 {
1292 struct seq_file *seq;
1293 int rc = -ENOMEM;
1294 struct raw6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1295 if (!s)
1296 goto out;
1297 rc = seq_open(file, &raw6_seq_ops);
1298 if (rc)
1299 goto out_kfree;
1300 seq = file->private_data;
1301 seq->private = s;
1302 out:
1303 return rc;
1304 out_kfree:
1305 kfree(s);
1306 goto out;
1307 }
1308
1309 static const struct file_operations raw6_seq_fops = {
1310 .owner = THIS_MODULE,
1311 .open = raw6_seq_open,
1312 .read = seq_read,
1313 .llseek = seq_lseek,
1314 .release = seq_release_private,
1315 };
1316
1317 int __init raw6_proc_init(void)
1318 {
1319 if (!proc_net_fops_create("raw6", S_IRUGO, &raw6_seq_fops))
1320 return -ENOMEM;
1321 return 0;
1322 }
1323
1324 void raw6_proc_exit(void)
1325 {
1326 proc_net_remove("raw6");
1327 }
1328 #endif /* CONFIG_PROC_FS */
Linux kernel - Deliverables
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