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[JFFS2] Fix return value from jffs2_write_end()
[linux-2.6/mini2440.git] / net / ipv6 / raw.c
blobca24ef19cd8f294c35d7d285751a5bb55c5d1838
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/net_namespace.h>
39 #include <net/ip.h>
40 #include <net/sock.h>
41 #include <net/snmp.h>
42
43 #include <net/ipv6.h>
44 #include <net/ndisc.h>
45 #include <net/protocol.h>
46 #include <net/ip6_route.h>
47 #include <net/ip6_checksum.h>
48 #include <net/addrconf.h>
49 #include <net/transp_v6.h>
50 #include <net/udp.h>
51 #include <net/inet_common.h>
52 #include <net/tcp_states.h>
53 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
54 #include <net/mip6.h>
55 #endif
56
57 #include <net/rawv6.h>
58 #include <net/xfrm.h>
59
60 #include <linux/proc_fs.h>
61 #include <linux/seq_file.h>
62
63 struct hlist_head raw_v6_htable[RAWV6_HTABLE_SIZE];
64 DEFINE_RWLOCK(raw_v6_lock);
65
66 static void raw_v6_hash(struct sock *sk)
67 {
68 struct hlist_head *list = &raw_v6_htable[inet_sk(sk)->num &
69 (RAWV6_HTABLE_SIZE - 1)];
70
71 write_lock_bh(&raw_v6_lock);
72 sk_add_node(sk, list);
73 sock_prot_inc_use(sk->sk_prot);
74 write_unlock_bh(&raw_v6_lock);
75 }
76
77 static void raw_v6_unhash(struct sock *sk)
78 {
79 write_lock_bh(&raw_v6_lock);
80 if (sk_del_node_init(sk))
81 sock_prot_dec_use(sk->sk_prot);
82 write_unlock_bh(&raw_v6_lock);
83 }
84
85
86 /* Grumble... icmp and ip_input want to get at this... */
87 struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num,
88 struct in6_addr *loc_addr, struct in6_addr *rmt_addr,
89 int dif)
90 {
91 struct hlist_node *node;
92 int is_multicast = ipv6_addr_is_multicast(loc_addr);
93
94 sk_for_each_from(sk, node)
95 if (inet_sk(sk)->num == num) {
96 struct ipv6_pinfo *np = inet6_sk(sk);
97
98 if (!ipv6_addr_any(&np->daddr) &&
99 !ipv6_addr_equal(&np->daddr, rmt_addr))
100 continue;
101
102 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
103 continue;
104
105 if (!ipv6_addr_any(&np->rcv_saddr)) {
106 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
107 goto found;
108 if (is_multicast &&
109 inet6_mc_check(sk, loc_addr, rmt_addr))
110 goto found;
111 continue;
112 }
113 goto found;
114 }
115 sk = NULL;
116 found:
117 return sk;
118 }
119
120 /*
121 * 0 - deliver
122 * 1 - block
123 */
124 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb)
125 {
126 struct icmp6hdr *icmph;
127 struct raw6_sock *rp = raw6_sk(sk);
128
129 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) {
130 __u32 *data = &rp->filter.data[0];
131 int bit_nr;
132
133 icmph = (struct icmp6hdr *) skb->data;
134 bit_nr = icmph->icmp6_type;
135
136 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0;
137 }
138 return 0;
139 }
140
141 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
142 static int (*mh_filter)(struct sock *sock, struct sk_buff *skb);
143
144 int rawv6_mh_filter_register(int (*filter)(struct sock *sock,
145 struct sk_buff *skb))
146 {
147 rcu_assign_pointer(mh_filter, filter);
148 return 0;
149 }
150 EXPORT_SYMBOL(rawv6_mh_filter_register);
151
152 int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock,
153 struct sk_buff *skb))
154 {
155 rcu_assign_pointer(mh_filter, NULL);
156 synchronize_rcu();
157 return 0;
158 }
159 EXPORT_SYMBOL(rawv6_mh_filter_unregister);
160
161 #endif
162
163 /*
164 * demultiplex raw sockets.
165 * (should consider queueing the skb in the sock receive_queue
166 * without calling rawv6.c)
167 *
168 * Caller owns SKB so we must make clones.
169 */
170 int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
171 {
172 struct in6_addr *saddr;
173 struct in6_addr *daddr;
174 struct sock *sk;
175 int delivered = 0;
176 __u8 hash;
177
178 saddr = &ipv6_hdr(skb)->saddr;
179 daddr = saddr + 1;
180
181 hash = nexthdr & (MAX_INET_PROTOS - 1);
182
183 read_lock(&raw_v6_lock);
184 sk = sk_head(&raw_v6_htable[hash]);
185
186 /*
187 * The first socket found will be delivered after
188 * delivery to transport protocols.
189 */
190
191 if (sk == NULL)
192 goto out;
193
194 sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
195
196 while (sk) {
197 int filtered;
198
199 delivered = 1;
200 switch (nexthdr) {
201 case IPPROTO_ICMPV6:
202 filtered = icmpv6_filter(sk, skb);
203 break;
204
205 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
206 case IPPROTO_MH:
207 {
208 /* XXX: To validate MH only once for each packet,
209 * this is placed here. It should be after checking
210 * xfrm policy, however it doesn't. The checking xfrm
211 * policy is placed in rawv6_rcv() because it is
212 * required for each socket.
213 */
214 int (*filter)(struct sock *sock, struct sk_buff *skb);
215
216 filter = rcu_dereference(mh_filter);
217 filtered = filter ? filter(sk, skb) : 0;
218 break;
219 }
220 #endif
221 default:
222 filtered = 0;
223 break;
224 }
225
226 if (filtered < 0)
227 break;
228 if (filtered == 0) {
229 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
230
231 /* Not releasing hash table! */
232 if (clone) {
233 nf_reset(clone);
234 rawv6_rcv(sk, clone);
235 }
236 }
237 sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr,
238 IP6CB(skb)->iif);
239 }
240 out:
241 read_unlock(&raw_v6_lock);
242 return delivered;
243 }
244
245 /* This cleans up af_inet6 a bit. -DaveM */
246 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
247 {
248 struct inet_sock *inet = inet_sk(sk);
249 struct ipv6_pinfo *np = inet6_sk(sk);
250 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
251 __be32 v4addr = 0;
252 int addr_type;
253 int err;
254
255 if (addr_len < SIN6_LEN_RFC2133)
256 return -EINVAL;
257 addr_type = ipv6_addr_type(&addr->sin6_addr);
258
259 /* Raw sockets are IPv6 only */
260 if (addr_type == IPV6_ADDR_MAPPED)
261 return(-EADDRNOTAVAIL);
262
263 lock_sock(sk);
264
265 err = -EINVAL;
266 if (sk->sk_state != TCP_CLOSE)
267 goto out;
268
269 /* Check if the address belongs to the host. */
270 if (addr_type != IPV6_ADDR_ANY) {
271 struct net_device *dev = NULL;
272
273 if (addr_type & IPV6_ADDR_LINKLOCAL) {
274 if (addr_len >= sizeof(struct sockaddr_in6) &&
275 addr->sin6_scope_id) {
276 /* Override any existing binding, if another
277 * one is supplied by user.
278 */
279 sk->sk_bound_dev_if = addr->sin6_scope_id;
280 }
281
282 /* Binding to link-local address requires an interface */
283 if (!sk->sk_bound_dev_if)
284 goto out;
285
286 dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
287 if (!dev) {
288 err = -ENODEV;
289 goto out;
290 }
291 }
292
293 /* ipv4 addr of the socket is invalid. Only the
294 * unspecified and mapped address have a v4 equivalent.
295 */
296 v4addr = LOOPBACK4_IPV6;
297 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
298 err = -EADDRNOTAVAIL;
299 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
300 if (dev)
301 dev_put(dev);
302 goto out;
303 }
304 }
305 if (dev)
306 dev_put(dev);
307 }
308
309 inet->rcv_saddr = inet->saddr = v4addr;
310 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
311 if (!(addr_type & IPV6_ADDR_MULTICAST))
312 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
313 err = 0;
314 out:
315 release_sock(sk);
316 return err;
317 }
318
319 void rawv6_err(struct sock *sk, struct sk_buff *skb,
320 struct inet6_skb_parm *opt,
321 int type, int code, int offset, __be32 info)
322 {
323 struct inet_sock *inet = inet_sk(sk);
324 struct ipv6_pinfo *np = inet6_sk(sk);
325 int err;
326 int harderr;
327
328 /* Report error on raw socket, if:
329 1. User requested recverr.
330 2. Socket is connected (otherwise the error indication
331 is useless without recverr and error is hard.
332 */
333 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
334 return;
335
336 harderr = icmpv6_err_convert(type, code, &err);
337 if (type == ICMPV6_PKT_TOOBIG)
338 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
339
340 if (np->recverr) {
341 u8 *payload = skb->data;
342 if (!inet->hdrincl)
343 payload += offset;
344 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
345 }
346
347 if (np->recverr || harderr) {
348 sk->sk_err = err;
349 sk->sk_error_report(sk);
350 }
351 }
352
353 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
354 {
355 if ((raw6_sk(sk)->checksum || sk->sk_filter) &&
356 skb_checksum_complete(skb)) {
357 /* FIXME: increment a raw6 drops counter here */
358 kfree_skb(skb);
359 return 0;
360 }
361
362 /* Charge it to the socket. */
363 if (sock_queue_rcv_skb(sk,skb)<0) {
364 /* FIXME: increment a raw6 drops counter here */
365 kfree_skb(skb);
366 return 0;
367 }
368
369 return 0;
370 }
371
372 /*
373 * This is next to useless...
374 * if we demultiplex in network layer we don't need the extra call
375 * just to queue the skb...
376 * maybe we could have the network decide upon a hint if it
377 * should call raw_rcv for demultiplexing
378 */
379 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
380 {
381 struct inet_sock *inet = inet_sk(sk);
382 struct raw6_sock *rp = raw6_sk(sk);
383
384 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
385 kfree_skb(skb);
386 return NET_RX_DROP;
387 }
388
389 if (!rp->checksum)
390 skb->ip_summed = CHECKSUM_UNNECESSARY;
391
392 if (skb->ip_summed == CHECKSUM_COMPLETE) {
393 skb_postpull_rcsum(skb, skb_network_header(skb),
394 skb_network_header_len(skb));
395 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
396 &ipv6_hdr(skb)->daddr,
397 skb->len, inet->num, skb->csum))
398 skb->ip_summed = CHECKSUM_UNNECESSARY;
399 }
400 if (!skb_csum_unnecessary(skb))
401 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
402 &ipv6_hdr(skb)->daddr,
403 skb->len,
404 inet->num, 0));
405
406 if (inet->hdrincl) {
407 if (skb_checksum_complete(skb)) {
408 /* FIXME: increment a raw6 drops counter here */
409 kfree_skb(skb);
410 return 0;
411 }
412 }
413
414 rawv6_rcv_skb(sk, skb);
415 return 0;
416 }
417
418
419 /*
420 * This should be easy, if there is something there
421 * we return it, otherwise we block.
422 */
423
424 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
425 struct msghdr *msg, size_t len,
426 int noblock, int flags, int *addr_len)
427 {
428 struct ipv6_pinfo *np = inet6_sk(sk);
429 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
430 struct sk_buff *skb;
431 size_t copied;
432 int err;
433
434 if (flags & MSG_OOB)
435 return -EOPNOTSUPP;
436
437 if (addr_len)
438 *addr_len=sizeof(*sin6);
439
440 if (flags & MSG_ERRQUEUE)
441 return ipv6_recv_error(sk, msg, len);
442
443 skb = skb_recv_datagram(sk, flags, noblock, &err);
444 if (!skb)
445 goto out;
446
447 copied = skb->len;
448 if (copied > len) {
449 copied = len;
450 msg->msg_flags |= MSG_TRUNC;
451 }
452
453 if (skb_csum_unnecessary(skb)) {
454 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
455 } else if (msg->msg_flags&MSG_TRUNC) {
456 if (__skb_checksum_complete(skb))
457 goto csum_copy_err;
458 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
459 } else {
460 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
461 if (err == -EINVAL)
462 goto csum_copy_err;
463 }
464 if (err)
465 goto out_free;
466
467 /* Copy the address. */
468 if (sin6) {
469 sin6->sin6_family = AF_INET6;
470 sin6->sin6_port = 0;
471 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
472 sin6->sin6_flowinfo = 0;
473 sin6->sin6_scope_id = 0;
474 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
475 sin6->sin6_scope_id = IP6CB(skb)->iif;
476 }
477
478 sock_recv_timestamp(msg, sk, skb);
479
480 if (np->rxopt.all)
481 datagram_recv_ctl(sk, msg, skb);
482
483 err = copied;
484 if (flags & MSG_TRUNC)
485 err = skb->len;
486
487 out_free:
488 skb_free_datagram(sk, skb);
489 out:
490 return err;
491
492 csum_copy_err:
493 skb_kill_datagram(sk, skb, flags);
494
495 /* Error for blocking case is chosen to masquerade
496 as some normal condition.
497 */
498 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
499 /* FIXME: increment a raw6 drops counter here */
500 goto out;
501 }
502
503 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
504 struct raw6_sock *rp)
505 {
506 struct sk_buff *skb;
507 int err = 0;
508 int offset;
509 int len;
510 int total_len;
511 __wsum tmp_csum;
512 __sum16 csum;
513
514 if (!rp->checksum)
515 goto send;
516
517 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
518 goto out;
519
520 offset = rp->offset;
521 total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) -
522 skb->data);
523 if (offset >= total_len - 1) {
524 err = -EINVAL;
525 ip6_flush_pending_frames(sk);
526 goto out;
527 }
528
529 /* should be check HW csum miyazawa */
530 if (skb_queue_len(&sk->sk_write_queue) == 1) {
531 /*
532 * Only one fragment on the socket.
533 */
534 tmp_csum = skb->csum;
535 } else {
536 struct sk_buff *csum_skb = NULL;
537 tmp_csum = 0;
538
539 skb_queue_walk(&sk->sk_write_queue, skb) {
540 tmp_csum = csum_add(tmp_csum, skb->csum);
541
542 if (csum_skb)
543 continue;
544
545 len = skb->len - skb_transport_offset(skb);
546 if (offset >= len) {
547 offset -= len;
548 continue;
549 }
550
551 csum_skb = skb;
552 }
553
554 skb = csum_skb;
555 }
556
557 offset += skb_transport_offset(skb);
558 if (skb_copy_bits(skb, offset, &csum, 2))
559 BUG();
560
561 /* in case cksum was not initialized */
562 if (unlikely(csum))
563 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
564
565 csum = csum_ipv6_magic(&fl->fl6_src,
566 &fl->fl6_dst,
567 total_len, fl->proto, tmp_csum);
568
569 if (csum == 0 && fl->proto == IPPROTO_UDP)
570 csum = CSUM_MANGLED_0;
571
572 if (skb_store_bits(skb, offset, &csum, 2))
573 BUG();
574
575 send:
576 err = ip6_push_pending_frames(sk);
577 out:
578 return err;
579 }
580
581 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
582 struct flowi *fl, struct rt6_info *rt,
583 unsigned int flags)
584 {
585 struct ipv6_pinfo *np = inet6_sk(sk);
586 struct ipv6hdr *iph;
587 struct sk_buff *skb;
588 unsigned int hh_len;
589 int err;
590
591 if (length > rt->u.dst.dev->mtu) {
592 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu);
593 return -EMSGSIZE;
594 }
595 if (flags&MSG_PROBE)
596 goto out;
597
598 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
599
600 skb = sock_alloc_send_skb(sk, length+hh_len+15,
601 flags&MSG_DONTWAIT, &err);
602 if (skb == NULL)
603 goto error;
604 skb_reserve(skb, hh_len);
605
606 skb->priority = sk->sk_priority;
607 skb->dst = dst_clone(&rt->u.dst);
608
609 skb_put(skb, length);
610 skb_reset_network_header(skb);
611 iph = ipv6_hdr(skb);
612
613 skb->ip_summed = CHECKSUM_NONE;
614
615 skb->transport_header = skb->network_header;
616 err = memcpy_fromiovecend((void *)iph, from, 0, length);
617 if (err)
618 goto error_fault;
619
620 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS);
621 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
622 dst_output);
623 if (err > 0)
624 err = np->recverr ? net_xmit_errno(err) : 0;
625 if (err)
626 goto error;
627 out:
628 return 0;
629
630 error_fault:
631 err = -EFAULT;
632 kfree_skb(skb);
633 error:
634 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
635 return err;
636 }
637
638 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
639 {
640 struct iovec *iov;
641 u8 __user *type = NULL;
642 u8 __user *code = NULL;
643 u8 len = 0;
644 int probed = 0;
645 int i;
646
647 if (!msg->msg_iov)
648 return 0;
649
650 for (i = 0; i < msg->msg_iovlen; i++) {
651 iov = &msg->msg_iov[i];
652 if (!iov)
653 continue;
654
655 switch (fl->proto) {
656 case IPPROTO_ICMPV6:
657 /* check if one-byte field is readable or not. */
658 if (iov->iov_base && iov->iov_len < 1)
659 break;
660
661 if (!type) {
662 type = iov->iov_base;
663 /* check if code field is readable or not. */
664 if (iov->iov_len > 1)
665 code = type + 1;
666 } else if (!code)
667 code = iov->iov_base;
668
669 if (type && code) {
670 if (get_user(fl->fl_icmp_type, type) ||
671 get_user(fl->fl_icmp_code, code))
672 return -EFAULT;
673 probed = 1;
674 }
675 break;
676 case IPPROTO_MH:
677 if (iov->iov_base && iov->iov_len < 1)
678 break;
679 /* check if type field is readable or not. */
680 if (iov->iov_len > 2 - len) {
681 u8 __user *p = iov->iov_base;
682 if (get_user(fl->fl_mh_type, &p[2 - len]))
683 return -EFAULT;
684 probed = 1;
685 } else
686 len += iov->iov_len;
687
688 break;
689 default:
690 probed = 1;
691 break;
692 }
693 if (probed)
694 break;
695 }
696 return 0;
697 }
698
699 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
700 struct msghdr *msg, size_t len)
701 {
702 struct ipv6_txoptions opt_space;
703 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
704 struct in6_addr *daddr, *final_p = NULL, final;
705 struct inet_sock *inet = inet_sk(sk);
706 struct ipv6_pinfo *np = inet6_sk(sk);
707 struct raw6_sock *rp = raw6_sk(sk);
708 struct ipv6_txoptions *opt = NULL;
709 struct ip6_flowlabel *flowlabel = NULL;
710 struct dst_entry *dst = NULL;
711 struct flowi fl;
712 int addr_len = msg->msg_namelen;
713 int hlimit = -1;
714 int tclass = -1;
715 u16 proto;
716 int err;
717
718 /* Rough check on arithmetic overflow,
719 better check is made in ip6_append_data().
720 */
721 if (len > INT_MAX)
722 return -EMSGSIZE;
723
724 /* Mirror BSD error message compatibility */
725 if (msg->msg_flags & MSG_OOB)
726 return -EOPNOTSUPP;
727
728 /*
729 * Get and verify the address.
730 */
731 memset(&fl, 0, sizeof(fl));
732
733 if (sin6) {
734 if (addr_len < SIN6_LEN_RFC2133)
735 return -EINVAL;
736
737 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
738 return(-EAFNOSUPPORT);
739
740 /* port is the proto value [0..255] carried in nexthdr */
741 proto = ntohs(sin6->sin6_port);
742
743 if (!proto)
744 proto = inet->num;
745 else if (proto != inet->num)
746 return(-EINVAL);
747
748 if (proto > 255)
749 return(-EINVAL);
750
751 daddr = &sin6->sin6_addr;
752 if (np->sndflow) {
753 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
754 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
755 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
756 if (flowlabel == NULL)
757 return -EINVAL;
758 daddr = &flowlabel->dst;
759 }
760 }
761
762 /*
763 * Otherwise it will be difficult to maintain
764 * sk->sk_dst_cache.
765 */
766 if (sk->sk_state == TCP_ESTABLISHED &&
767 ipv6_addr_equal(daddr, &np->daddr))
768 daddr = &np->daddr;
769
770 if (addr_len >= sizeof(struct sockaddr_in6) &&
771 sin6->sin6_scope_id &&
772 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
773 fl.oif = sin6->sin6_scope_id;
774 } else {
775 if (sk->sk_state != TCP_ESTABLISHED)
776 return -EDESTADDRREQ;
777
778 proto = inet->num;
779 daddr = &np->daddr;
780 fl.fl6_flowlabel = np->flow_label;
781 }
782
783 if (ipv6_addr_any(daddr)) {
784 /*
785 * unspecified destination address
786 * treated as error... is this correct ?
787 */
788 fl6_sock_release(flowlabel);
789 return(-EINVAL);
790 }
791
792 if (fl.oif == 0)
793 fl.oif = sk->sk_bound_dev_if;
794
795 if (msg->msg_controllen) {
796 opt = &opt_space;
797 memset(opt, 0, sizeof(struct ipv6_txoptions));
798 opt->tot_len = sizeof(struct ipv6_txoptions);
799
800 err = datagram_send_ctl(msg, &fl, opt, &hlimit, &tclass);
801 if (err < 0) {
802 fl6_sock_release(flowlabel);
803 return err;
804 }
805 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
806 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
807 if (flowlabel == NULL)
808 return -EINVAL;
809 }
810 if (!(opt->opt_nflen|opt->opt_flen))
811 opt = NULL;
812 }
813 if (opt == NULL)
814 opt = np->opt;
815 if (flowlabel)
816 opt = fl6_merge_options(&opt_space, flowlabel, opt);
817 opt = ipv6_fixup_options(&opt_space, opt);
818
819 fl.proto = proto;
820 err = rawv6_probe_proto_opt(&fl, msg);
821 if (err)
822 goto out;
823
824 ipv6_addr_copy(&fl.fl6_dst, daddr);
825 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
826 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
827
828 /* merge ip6_build_xmit from ip6_output */
829 if (opt && opt->srcrt) {
830 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
831 ipv6_addr_copy(&final, &fl.fl6_dst);
832 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
833 final_p = &final;
834 }
835
836 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
837 fl.oif = np->mcast_oif;
838 security_sk_classify_flow(sk, &fl);
839
840 err = ip6_dst_lookup(sk, &dst, &fl);
841 if (err)
842 goto out;
843 if (final_p)
844 ipv6_addr_copy(&fl.fl6_dst, final_p);
845
846 if ((err = __xfrm_lookup(&dst, &fl, sk, 1)) < 0) {
847 if (err == -EREMOTE)
848 err = ip6_dst_blackhole(sk, &dst, &fl);
849 if (err < 0)
850 goto out;
851 }
852
853 if (hlimit < 0) {
854 if (ipv6_addr_is_multicast(&fl.fl6_dst))
855 hlimit = np->mcast_hops;
856 else
857 hlimit = np->hop_limit;
858 if (hlimit < 0)
859 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
860 if (hlimit < 0)
861 hlimit = ipv6_get_hoplimit(dst->dev);
862 }
863
864 if (tclass < 0) {
865 tclass = np->tclass;
866 if (tclass < 0)
867 tclass = 0;
868 }
869
870 if (msg->msg_flags&MSG_CONFIRM)
871 goto do_confirm;
872
873 back_from_confirm:
874 if (inet->hdrincl) {
875 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags);
876 } else {
877 lock_sock(sk);
878 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
879 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst,
880 msg->msg_flags);
881
882 if (err)
883 ip6_flush_pending_frames(sk);
884 else if (!(msg->msg_flags & MSG_MORE))
885 err = rawv6_push_pending_frames(sk, &fl, rp);
886 release_sock(sk);
887 }
888 done:
889 dst_release(dst);
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 return seq_open_private(file, &raw6_seq_ops,
1293 sizeof(struct raw6_iter_state));
1294 }
1295
1296 static const struct file_operations raw6_seq_fops = {
1297 .owner = THIS_MODULE,
1298 .open = raw6_seq_open,
1299 .read = seq_read,
1300 .llseek = seq_lseek,
1301 .release = seq_release_private,
1302 };
1303
1304 int __init raw6_proc_init(void)
1305 {
1306 if (!proc_net_fops_create(&init_net, "raw6", S_IRUGO, &raw6_seq_fops))
1307 return -ENOMEM;
1308 return 0;
1309 }
1310
1311 void raw6_proc_exit(void)
1312 {
1313 proc_net_remove(&init_net, "raw6");
1314 }
1315 #endif /* CONFIG_PROC_FS */
Support for the Chinese Samsung S3C2440 based development boards