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[IPV6]: Check interface bindings on IPv6 raw socket reception
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / raw.c
CommitLineData
1da177e4
LT		 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/sched.h>
28#include <linux/net.h>
29#include <linux/in6.h>
30#include <linux/netdevice.h>
31#include <linux/if_arp.h>
32#include <linux/icmpv6.h>
33#include <linux/netfilter.h>
34#include <linux/netfilter_ipv6.h>
35#include <asm/uaccess.h>
36#include <asm/ioctls.h>
357b40a1 37#include <asm/bug.h>
1da177e4
LT		 38
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
53#include <net/rawv6.h>
54#include <net/xfrm.h>
55
56#include <linux/proc_fs.h>
57#include <linux/seq_file.h>
58
59struct hlist_head raw_v6_htable[RAWV6_HTABLE_SIZE];
60DEFINE_RWLOCK(raw_v6_lock);
61
62static void raw_v6_hash(struct sock *sk)
63{
64 struct hlist_head *list = &raw_v6_htable[inet_sk(sk)->num &
65 (RAWV6_HTABLE_SIZE - 1)];
66
67 write_lock_bh(&raw_v6_lock);
68 sk_add_node(sk, list);
69 sock_prot_inc_use(sk->sk_prot);
70 write_unlock_bh(&raw_v6_lock);
71}
72
73static void raw_v6_unhash(struct sock *sk)
74{
75 write_lock_bh(&raw_v6_lock);
76 if (sk_del_node_init(sk))
77 sock_prot_dec_use(sk->sk_prot);
78 write_unlock_bh(&raw_v6_lock);
79}
80
81
82/* Grumble... icmp and ip_input want to get at this... */
83struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num,
0bd1b59b
AM		 84 struct in6_addr *loc_addr, struct in6_addr *rmt_addr,
85 int dif)
1da177e4
LT		 86{
87 struct hlist_node *node;
88 int is_multicast = ipv6_addr_is_multicast(loc_addr);
89
90 sk_for_each_from(sk, node)
91 if (inet_sk(sk)->num == num) {
92 struct ipv6_pinfo *np = inet6_sk(sk);
93
94 if (!ipv6_addr_any(&np->daddr) &&
95 !ipv6_addr_equal(&np->daddr, rmt_addr))
96 continue;
97
0bd1b59b
AM		 98 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
99 continue;
100
1da177e4
LT		 101 if (!ipv6_addr_any(&np->rcv_saddr)) {
102 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
103 goto found;
104 if (is_multicast &&
105 inet6_mc_check(sk, loc_addr, rmt_addr))
106 goto found;
107 continue;
108 }
109 goto found;
110 }
111 sk = NULL;
112found:
113 return sk;
114}
115
116/*
117 * 0 - deliver
118 * 1 - block
119 */
120static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb)
121{
122 struct icmp6hdr *icmph;
123 struct raw6_sock *rp = raw6_sk(sk);
124
125 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) {
126 __u32 *data = &rp->filter.data[0];
127 int bit_nr;
128
129 icmph = (struct icmp6hdr *) skb->data;
130 bit_nr = icmph->icmp6_type;
131
132 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0;
133 }
134 return 0;
135}
136
137/*
138 * demultiplex raw sockets.
139 * (should consider queueing the skb in the sock receive_queue
140 * without calling rawv6.c)
141 *
142 * Caller owns SKB so we must make clones.
143 */
144void ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
145{
146 struct in6_addr *saddr;
147 struct in6_addr *daddr;
148 struct sock *sk;
149 __u8 hash;
150
151 saddr = &skb->nh.ipv6h->saddr;
152 daddr = saddr + 1;
153
154 hash = nexthdr & (MAX_INET_PROTOS - 1);
155
156 read_lock(&raw_v6_lock);
157 sk = sk_head(&raw_v6_htable[hash]);
158
159 /*
160 * The first socket found will be delivered after
161 * delivery to transport protocols.
162 */
163
164 if (sk == NULL)
165 goto out;
166
0bd1b59b 167 sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, skb->dev->ifindex);
1da177e4
LT		 168
169 while (sk) {
170 if (nexthdr != IPPROTO_ICMPV6 || !icmpv6_filter(sk, skb)) {
171 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
172
173 /* Not releasing hash table! */
174 if (clone)
175 rawv6_rcv(sk, clone);
176 }
0bd1b59b
AM		 177 sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr,
178 skb->dev->ifindex);
1da177e4
LT		 179 }
180out:
181 read_unlock(&raw_v6_lock);
182}
183
184/* This cleans up af_inet6 a bit. -DaveM */
185static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
186{
187 struct inet_sock *inet = inet_sk(sk);
188 struct ipv6_pinfo *np = inet6_sk(sk);
189 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
190 __u32 v4addr = 0;
191 int addr_type;
192 int err;
193
194 if (addr_len < SIN6_LEN_RFC2133)
195 return -EINVAL;
196 addr_type = ipv6_addr_type(&addr->sin6_addr);
197
198 /* Raw sockets are IPv6 only */
199 if (addr_type == IPV6_ADDR_MAPPED)
200 return(-EADDRNOTAVAIL);
201
202 lock_sock(sk);
203
204 err = -EINVAL;
205 if (sk->sk_state != TCP_CLOSE)
206 goto out;
207
208 /* Check if the address belongs to the host. */
209 if (addr_type != IPV6_ADDR_ANY) {
210 struct net_device *dev = NULL;
211
212 if (addr_type & IPV6_ADDR_LINKLOCAL) {
213 if (addr_len >= sizeof(struct sockaddr_in6) &&
214 addr->sin6_scope_id) {
215 /* Override any existing binding, if another
216 * one is supplied by user.
217 */
218 sk->sk_bound_dev_if = addr->sin6_scope_id;
219 }
220
221 /* Binding to link-local address requires an interface */
222 if (!sk->sk_bound_dev_if)
223 goto out;
224
225 dev = dev_get_by_index(sk->sk_bound_dev_if);
226 if (!dev) {
227 err = -ENODEV;
228 goto out;
229 }
230 }
231
232 /* ipv4 addr of the socket is invalid. Only the
233 * unspecified and mapped address have a v4 equivalent.
234 */
235 v4addr = LOOPBACK4_IPV6;
236 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
237 err = -EADDRNOTAVAIL;
238 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
239 if (dev)
240 dev_put(dev);
241 goto out;
242 }
243 }
244 if (dev)
245 dev_put(dev);
246 }
247
248 inet->rcv_saddr = inet->saddr = v4addr;
249 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
250 if (!(addr_type & IPV6_ADDR_MULTICAST))
251 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
252 err = 0;
253out:
254 release_sock(sk);
255 return err;
256}
257
258void rawv6_err(struct sock *sk, struct sk_buff *skb,
259 struct inet6_skb_parm *opt,
260 int type, int code, int offset, u32 info)
261{
262 struct inet_sock *inet = inet_sk(sk);
263 struct ipv6_pinfo *np = inet6_sk(sk);
264 int err;
265 int harderr;
266
267 /* Report error on raw socket, if:
268 1. User requested recverr.
269 2. Socket is connected (otherwise the error indication
270 is useless without recverr and error is hard.
271 */
272 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
273 return;
274
275 harderr = icmpv6_err_convert(type, code, &err);
276 if (type == ICMPV6_PKT_TOOBIG)
277 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
278
279 if (np->recverr) {
280 u8 *payload = skb->data;
281 if (!inet->hdrincl)
282 payload += offset;
283 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
284 }
285
286 if (np->recverr || harderr) {
287 sk->sk_err = err;
288 sk->sk_error_report(sk);
289 }
290}
291
292static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
293{
294 if ((raw6_sk(sk)->checksum || sk->sk_filter) &&
295 skb->ip_summed != CHECKSUM_UNNECESSARY) {
296 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
297 /* FIXME: increment a raw6 drops counter here */
298 kfree_skb(skb);
299 return 0;
300 }
301 skb->ip_summed = CHECKSUM_UNNECESSARY;
302 }
303
304 /* Charge it to the socket. */
305 if (sock_queue_rcv_skb(sk,skb)<0) {
306 /* FIXME: increment a raw6 drops counter here */
307 kfree_skb(skb);
308 return 0;
309 }
310
311 return 0;
312}
313
314/*
315 * This is next to useless...
316 * if we demultiplex in network layer we don't need the extra call
317 * just to queue the skb...
318 * maybe we could have the network decide upon a hint if it
319 * should call raw_rcv for demultiplexing
320 */
321int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
322{
323 struct inet_sock *inet = inet_sk(sk);
324 struct raw6_sock *rp = raw6_sk(sk);
325
326 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
327 kfree_skb(skb);
328 return NET_RX_DROP;
329 }
330
331 if (!rp->checksum)
332 skb->ip_summed = CHECKSUM_UNNECESSARY;
333
334 if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
335 if (skb->ip_summed == CHECKSUM_HW) {
793245ee
PM		 336 skb_postpull_rcsum(skb, skb->nh.raw,
337 skb->h.raw - skb->nh.raw);
1da177e4
LT		 338 skb->ip_summed = CHECKSUM_UNNECESSARY;
339 if (csum_ipv6_magic(&skb->nh.ipv6h->saddr,
340 &skb->nh.ipv6h->daddr,
341 skb->len, inet->num, skb->csum)) {
342 LIMIT_NETDEBUG(
343 printk(KERN_DEBUG "raw v6 hw csum failure.\n"));
344 skb->ip_summed = CHECKSUM_NONE;
345 }
346 }
347 if (skb->ip_summed == CHECKSUM_NONE)
348 skb->csum = ~csum_ipv6_magic(&skb->nh.ipv6h->saddr,
349 &skb->nh.ipv6h->daddr,
350 skb->len, inet->num, 0);
351 }
352
353 if (inet->hdrincl) {
354 if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
355 (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
356 /* FIXME: increment a raw6 drops counter here */
357 kfree_skb(skb);
358 return 0;
359 }
360 skb->ip_summed = CHECKSUM_UNNECESSARY;
361 }
362
363 rawv6_rcv_skb(sk, skb);
364 return 0;
365}
366
367
368/*
369 * This should be easy, if there is something there
370 * we return it, otherwise we block.
371 */
372
373static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
374 struct msghdr *msg, size_t len,
375 int noblock, int flags, int *addr_len)
376{
377 struct ipv6_pinfo *np = inet6_sk(sk);
378 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
379 struct sk_buff *skb;
380 size_t copied;
381 int err;
382
383 if (flags & MSG_OOB)
384 return -EOPNOTSUPP;
385
386 if (addr_len)
387 *addr_len=sizeof(*sin6);
388
389 if (flags & MSG_ERRQUEUE)
390 return ipv6_recv_error(sk, msg, len);
391
392 skb = skb_recv_datagram(sk, flags, noblock, &err);
393 if (!skb)
394 goto out;
395
396 copied = skb->len;
397 if (copied > len) {
398 copied = len;
399 msg->msg_flags |= MSG_TRUNC;
400 }
401
402 if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
403 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
404 } else if (msg->msg_flags&MSG_TRUNC) {
405 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
406 goto csum_copy_err;
407 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
408 } else {
409 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
410 if (err == -EINVAL)
411 goto csum_copy_err;
412 }
413 if (err)
414 goto out_free;
415
416 /* Copy the address. */
417 if (sin6) {
418 sin6->sin6_family = AF_INET6;
419 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
420 sin6->sin6_flowinfo = 0;
421 sin6->sin6_scope_id = 0;
422 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
423 sin6->sin6_scope_id = IP6CB(skb)->iif;
424 }
425
426 sock_recv_timestamp(msg, sk, skb);
427
428 if (np->rxopt.all)
429 datagram_recv_ctl(sk, msg, skb);
430
431 err = copied;
432 if (flags & MSG_TRUNC)
433 err = skb->len;
434
435out_free:
436 skb_free_datagram(sk, skb);
437out:
438 return err;
439
440csum_copy_err:
441 /* Clear queue. */
442 if (flags&MSG_PEEK) {
443 int clear = 0;
e0f9f858 444 spin_lock_bh(&sk->sk_receive_queue.lock);
1da177e4
LT		 445 if (skb == skb_peek(&sk->sk_receive_queue)) {
446 __skb_unlink(skb, &sk->sk_receive_queue);
447 clear = 1;
448 }
e0f9f858 449 spin_unlock_bh(&sk->sk_receive_queue.lock);
1da177e4
LT		 450 if (clear)
451 kfree_skb(skb);
452 }
453
454 /* Error for blocking case is chosen to masquerade
455 as some normal condition.
456 */
457 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
458 /* FIXME: increment a raw6 drops counter here */
459 goto out_free;
460}
461
462static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
357b40a1 463 struct raw6_sock *rp)
1da177e4
LT		 464{
465 struct sk_buff *skb;
466 int err = 0;
357b40a1
HX		 467 int offset;
468 int len;
679a8738 469 int total_len;
1da177e4 470 u32 tmp_csum;
357b40a1 471 u16 csum;
1da177e4
LT		 472
473 if (!rp->checksum)
474 goto send;
475
476 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
477 goto out;
478
357b40a1 479 offset = rp->offset;
679a8738
HX		 480 total_len = inet_sk(sk)->cork.length - (skb->nh.raw - skb->data);
481 if (offset >= total_len - 1) {
1da177e4 482 err = -EINVAL;
357b40a1 483 ip6_flush_pending_frames(sk);
1da177e4
LT		 484 goto out;
485 }
486
487 /* should be check HW csum miyazawa */
488 if (skb_queue_len(&sk->sk_write_queue) == 1) {
489 /*
490 * Only one fragment on the socket.
491 */
492 tmp_csum = skb->csum;
493 } else {
357b40a1 494 struct sk_buff *csum_skb = NULL;
1da177e4
LT		 495 tmp_csum = 0;
496
497 skb_queue_walk(&sk->sk_write_queue, skb) {
498 tmp_csum = csum_add(tmp_csum, skb->csum);
357b40a1
HX		 499
500 if (csum_skb)
501 continue;
502
503 len = skb->len - (skb->h.raw - skb->data);
504 if (offset >= len) {
505 offset -= len;
506 continue;
507 }
508
509 csum_skb = skb;
1da177e4 510 }
357b40a1
HX		 511
512 skb = csum_skb;
1da177e4
LT		 513 }
514
357b40a1
HX		 515 offset += skb->h.raw - skb->data;
516 if (skb_copy_bits(skb, offset, &csum, 2))
517 BUG();
518
1da177e4 519 /* in case cksum was not initialized */
357b40a1
HX		 520 if (unlikely(csum))
521 tmp_csum = csum_sub(tmp_csum, csum);
522
523 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
524 &fl->fl6_dst,
679a8738 525 total_len, fl->proto, tmp_csum);
357b40a1
HX		 526
527 if (tmp_csum == 0)
528 tmp_csum = -1;
1da177e4 529
357b40a1
HX		 530 csum = tmp_csum;
531 if (skb_store_bits(skb, offset, &csum, 2))
532 BUG();
1da177e4 533
1da177e4
LT		 534send:
535 err = ip6_push_pending_frames(sk);
536out:
537 return err;
538}
539
540static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
541 struct flowi *fl, struct rt6_info *rt,
542 unsigned int flags)
543{
3320da89 544 struct ipv6_pinfo *np = inet6_sk(sk);
1da177e4
LT		 545 struct ipv6hdr *iph;
546 struct sk_buff *skb;
547 unsigned int hh_len;
548 int err;
549
550 if (length > rt->u.dst.dev->mtu) {
551 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu);
552 return -EMSGSIZE;
553 }
554 if (flags&MSG_PROBE)
555 goto out;
556
557 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
558
559 skb = sock_alloc_send_skb(sk, length+hh_len+15,
560 flags&MSG_DONTWAIT, &err);
561 if (skb == NULL)
562 goto error;
563 skb_reserve(skb, hh_len);
564
565 skb->priority = sk->sk_priority;
566 skb->dst = dst_clone(&rt->u.dst);
567
568 skb->nh.ipv6h = iph = (struct ipv6hdr *)skb_put(skb, length);
569
570 skb->ip_summed = CHECKSUM_NONE;
571
572 skb->h.raw = skb->nh.raw;
573 err = memcpy_fromiovecend((void *)iph, from, 0, length);
574 if (err)
575 goto error_fault;
576
577 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
578 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
579 dst_output);
580 if (err > 0)
3320da89 581 err = np->recverr ? net_xmit_errno(err) : 0;
1da177e4
LT		 582 if (err)
583 goto error;
584out:
585 return 0;
586
587error_fault:
588 err = -EFAULT;
589 kfree_skb(skb);
590error:
591 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
592 return err;
593}
594
595static void rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
596{
597 struct iovec *iov;
598 u8 __user *type = NULL;
599 u8 __user *code = NULL;
600 int probed = 0;
601 int i;
602
603 if (!msg->msg_iov)
604 return;
605
606 for (i = 0; i < msg->msg_iovlen; i++) {
607 iov = &msg->msg_iov[i];
608 if (!iov)
609 continue;
610
611 switch (fl->proto) {
612 case IPPROTO_ICMPV6:
613 /* check if one-byte field is readable or not. */
614 if (iov->iov_base && iov->iov_len < 1)
615 break;
616
617 if (!type) {
618 type = iov->iov_base;
619 /* check if code field is readable or not. */
620 if (iov->iov_len > 1)
621 code = type + 1;
622 } else if (!code)
623 code = iov->iov_base;
624
625 if (type && code) {
626 get_user(fl->fl_icmp_type, type);
627 __get_user(fl->fl_icmp_code, code);
628 probed = 1;
629 }
630 break;
631 default:
632 probed = 1;
633 break;
634 }
635 if (probed)
636 break;
637 }
638}
639
640static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
641 struct msghdr *msg, size_t len)
642{
643 struct ipv6_txoptions opt_space;
644 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
645 struct in6_addr *daddr, *final_p = NULL, final;
646 struct inet_sock *inet = inet_sk(sk);
647 struct ipv6_pinfo *np = inet6_sk(sk);
648 struct raw6_sock *rp = raw6_sk(sk);
649 struct ipv6_txoptions *opt = NULL;
650 struct ip6_flowlabel *flowlabel = NULL;
651 struct dst_entry *dst = NULL;
652 struct flowi fl;
653 int addr_len = msg->msg_namelen;
654 int hlimit = -1;
655 u16 proto;
656 int err;
657
658 /* Rough check on arithmetic overflow,
659 better check is made in ip6_build_xmit
660 */
661 if (len < 0)
662 return -EMSGSIZE;
663
664 /* Mirror BSD error message compatibility */
665 if (msg->msg_flags & MSG_OOB)
666 return -EOPNOTSUPP;
667
668 /*
669 * Get and verify the address.
670 */
671 memset(&fl, 0, sizeof(fl));
672
673 if (sin6) {
674 if (addr_len < SIN6_LEN_RFC2133)
675 return -EINVAL;
676
677 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
678 return(-EAFNOSUPPORT);
679
680 /* port is the proto value [0..255] carried in nexthdr */
681 proto = ntohs(sin6->sin6_port);
682
683 if (!proto)
684 proto = inet->num;
685 else if (proto != inet->num)
686 return(-EINVAL);
687
688 if (proto > 255)
689 return(-EINVAL);
690
691 daddr = &sin6->sin6_addr;
692 if (np->sndflow) {
693 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
694 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
695 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
696 if (flowlabel == NULL)
697 return -EINVAL;
698 daddr = &flowlabel->dst;
699 }
700 }
701
702 /*
703 * Otherwise it will be difficult to maintain
704 * sk->sk_dst_cache.
705 */
706 if (sk->sk_state == TCP_ESTABLISHED &&
707 ipv6_addr_equal(daddr, &np->daddr))
708 daddr = &np->daddr;
709
710 if (addr_len >= sizeof(struct sockaddr_in6) &&
711 sin6->sin6_scope_id &&
712 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
713 fl.oif = sin6->sin6_scope_id;
714 } else {
715 if (sk->sk_state != TCP_ESTABLISHED)
716 return -EDESTADDRREQ;
717
718 proto = inet->num;
719 daddr = &np->daddr;
720 fl.fl6_flowlabel = np->flow_label;
721 }
722
723 if (ipv6_addr_any(daddr)) {
724 /*
725 * unspecified destination address
726 * treated as error... is this correct ?
727 */
728 fl6_sock_release(flowlabel);
729 return(-EINVAL);
730 }
731
732 if (fl.oif == 0)
733 fl.oif = sk->sk_bound_dev_if;
734
735 if (msg->msg_controllen) {
736 opt = &opt_space;
737 memset(opt, 0, sizeof(struct ipv6_txoptions));
738 opt->tot_len = sizeof(struct ipv6_txoptions);
739
740 err = datagram_send_ctl(msg, &fl, opt, &hlimit);
741 if (err < 0) {
742 fl6_sock_release(flowlabel);
743 return err;
744 }
745 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
746 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
747 if (flowlabel == NULL)
748 return -EINVAL;
749 }
750 if (!(opt->opt_nflen|opt->opt_flen))
751 opt = NULL;
752 }
753 if (opt == NULL)
754 opt = np->opt;
755 if (flowlabel)
756 opt = fl6_merge_options(&opt_space, flowlabel, opt);
757
758 fl.proto = proto;
759 rawv6_probe_proto_opt(&fl, msg);
760
761 ipv6_addr_copy(&fl.fl6_dst, daddr);
762 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
763 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
764
765 /* merge ip6_build_xmit from ip6_output */
766 if (opt && opt->srcrt) {
767 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
768 ipv6_addr_copy(&final, &fl.fl6_dst);
769 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
770 final_p = &final;
771 }
772
773 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
774 fl.oif = np->mcast_oif;
775
776 err = ip6_dst_lookup(sk, &dst, &fl);
777 if (err)
778 goto out;
779 if (final_p)
780 ipv6_addr_copy(&fl.fl6_dst, final_p);
781
782 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
783 dst_release(dst);
784 goto out;
785 }
786
787 if (hlimit < 0) {
788 if (ipv6_addr_is_multicast(&fl.fl6_dst))
789 hlimit = np->mcast_hops;
790 else
791 hlimit = np->hop_limit;
792 if (hlimit < 0)
793 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
794 if (hlimit < 0)
795 hlimit = ipv6_get_hoplimit(dst->dev);
796 }
797
798 if (msg->msg_flags&MSG_CONFIRM)
799 goto do_confirm;
800
801back_from_confirm:
802 if (inet->hdrincl) {
803 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags);
804 } else {
805 lock_sock(sk);
806 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0,
807 hlimit, opt, &fl, (struct rt6_info*)dst, msg->msg_flags);
808
809 if (err)
810 ip6_flush_pending_frames(sk);
811 else if (!(msg->msg_flags & MSG_MORE))
357b40a1 812 err = rawv6_push_pending_frames(sk, &fl, rp);
1da177e4
LT		 813 }
814done:
815 ip6_dst_store(sk, dst,
816 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
817 &np->daddr : NULL);
1da177e4
LT		 818
819 release_sock(sk);
820out:
821 fl6_sock_release(flowlabel);
822 return err<0?err:len;
823do_confirm:
824 dst_confirm(dst);
825 if (!(msg->msg_flags & MSG_PROBE) || len)
826 goto back_from_confirm;
827 err = 0;
828 goto done;
829}
830
831static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
832 char __user *optval, int optlen)
833{
834 switch (optname) {
835 case ICMPV6_FILTER:
836 if (optlen > sizeof(struct icmp6_filter))
837 optlen = sizeof(struct icmp6_filter);
838 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
839 return -EFAULT;
840 return 0;
841 default:
842 return -ENOPROTOOPT;
843 };
844
845 return 0;
846}
847
848static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
849 char __user *optval, int __user *optlen)
850{
851 int len;
852
853 switch (optname) {
854 case ICMPV6_FILTER:
855 if (get_user(len, optlen))
856 return -EFAULT;
857 if (len < 0)
858 return -EINVAL;
859 if (len > sizeof(struct icmp6_filter))
860 len = sizeof(struct icmp6_filter);
861 if (put_user(len, optlen))
862 return -EFAULT;
863 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
864 return -EFAULT;
865 return 0;
866 default:
867 return -ENOPROTOOPT;
868 };
869
870 return 0;
871}
872
873
874static int rawv6_setsockopt(struct sock *sk, int level, int optname,
875 char __user *optval, int optlen)
876{
877 struct raw6_sock *rp = raw6_sk(sk);
878 int val;
879
880 switch(level) {
881 case SOL_RAW:
882 break;
883
884 case SOL_ICMPV6:
885 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
886 return -EOPNOTSUPP;
887 return rawv6_seticmpfilter(sk, level, optname, optval,
888 optlen);
889 case SOL_IPV6:
890 if (optname == IPV6_CHECKSUM)
891 break;
892 default:
893 return ipv6_setsockopt(sk, level, optname, optval,
894 optlen);
895 };
896
897 if (get_user(val, (int __user *)optval))
898 return -EFAULT;
899
900 switch (optname) {
901 case IPV6_CHECKSUM:
902 /* You may get strange result with a positive odd offset;
903 RFC2292bis agrees with me. */
904 if (val > 0 && (val&1))
905 return(-EINVAL);
906 if (val < 0) {
907 rp->checksum = 0;
908 } else {
909 rp->checksum = 1;
910 rp->offset = val;
911 }
912
913 return 0;
914 break;
915
916 default:
917 return(-ENOPROTOOPT);
918 }
919}
920
921static int rawv6_getsockopt(struct sock *sk, int level, int optname,
922 char __user *optval, int __user *optlen)
923{
924 struct raw6_sock *rp = raw6_sk(sk);
925 int val, len;
926
927 switch(level) {
928 case SOL_RAW:
929 break;
930
931 case SOL_ICMPV6:
932 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
933 return -EOPNOTSUPP;
934 return rawv6_geticmpfilter(sk, level, optname, optval,
935 optlen);
936 case SOL_IPV6:
937 if (optname == IPV6_CHECKSUM)
938 break;
939 default:
940 return ipv6_getsockopt(sk, level, optname, optval,
941 optlen);
942 };
943
944 if (get_user(len,optlen))
945 return -EFAULT;
946
947 switch (optname) {
948 case IPV6_CHECKSUM:
949 if (rp->checksum == 0)
950 val = -1;
951 else
952 val = rp->offset;
953 break;
954
955 default:
956 return -ENOPROTOOPT;
957 }
958
959 len = min_t(unsigned int, sizeof(int), len);
960
961 if (put_user(len, optlen))
962 return -EFAULT;
963 if (copy_to_user(optval,&val,len))
964 return -EFAULT;
965 return 0;
966}
967
968static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
969{
970 switch(cmd) {
971 case SIOCOUTQ:
972 {
973 int amount = atomic_read(&sk->sk_wmem_alloc);
974 return put_user(amount, (int __user *)arg);
975 }
976 case SIOCINQ:
977 {
978 struct sk_buff *skb;
979 int amount = 0;
980
e0f9f858 981 spin_lock_bh(&sk->sk_receive_queue.lock);
1da177e4
LT		 982 skb = skb_peek(&sk->sk_receive_queue);
983 if (skb != NULL)
984 amount = skb->tail - skb->h.raw;
e0f9f858 985 spin_unlock_bh(&sk->sk_receive_queue.lock);
1da177e4
LT		 986 return put_user(amount, (int __user *)arg);
987 }
988
989 default:
990 return -ENOIOCTLCMD;
991 }
992}
993
994static void rawv6_close(struct sock *sk, long timeout)
995{
996 if (inet_sk(sk)->num == IPPROTO_RAW)
997 ip6_ra_control(sk, -1, NULL);
998
999 sk_common_release(sk);
1000}
1001
1002static int rawv6_init_sk(struct sock *sk)
1003{
1004 if (inet_sk(sk)->num == IPPROTO_ICMPV6) {
1005 struct raw6_sock *rp = raw6_sk(sk);
1006 rp->checksum = 1;
1007 rp->offset = 2;
1008 }
1009 return(0);
1010}
1011
1012struct proto rawv6_prot = {
1013 .name = "RAWv6",
1014 .owner = THIS_MODULE,
1015 .close = rawv6_close,
1016 .connect = ip6_datagram_connect,
1017 .disconnect = udp_disconnect,
1018 .ioctl = rawv6_ioctl,
1019 .init = rawv6_init_sk,
1020 .destroy = inet6_destroy_sock,
1021 .setsockopt = rawv6_setsockopt,
1022 .getsockopt = rawv6_getsockopt,
1023 .sendmsg = rawv6_sendmsg,
1024 .recvmsg = rawv6_recvmsg,
1025 .bind = rawv6_bind,
1026 .backlog_rcv = rawv6_rcv_skb,
1027 .hash = raw_v6_hash,
1028 .unhash = raw_v6_unhash,
1029 .obj_size = sizeof(struct raw6_sock),
1030};
1031
1032#ifdef CONFIG_PROC_FS
1033struct raw6_iter_state {
1034 int bucket;
1035};
1036
1037#define raw6_seq_private(seq) ((struct raw6_iter_state *)(seq)->private)
1038
1039static struct sock *raw6_get_first(struct seq_file *seq)
1040{
1041 struct sock *sk;
1042 struct hlist_node *node;
1043 struct raw6_iter_state* state = raw6_seq_private(seq);
1044
1045 for (state->bucket = 0; state->bucket < RAWV6_HTABLE_SIZE; ++state->bucket)
1046 sk_for_each(sk, node, &raw_v6_htable[state->bucket])
1047 if (sk->sk_family == PF_INET6)
1048 goto out;
1049 sk = NULL;
1050out:
1051 return sk;
1052}
1053
1054static struct sock *raw6_get_next(struct seq_file *seq, struct sock *sk)
1055{
1056 struct raw6_iter_state* state = raw6_seq_private(seq);
1057
1058 do {
1059 sk = sk_next(sk);
1060try_again:
1061 ;
1062 } while (sk && sk->sk_family != PF_INET6);
1063
1064 if (!sk && ++state->bucket < RAWV6_HTABLE_SIZE) {
1065 sk = sk_head(&raw_v6_htable[state->bucket]);
1066 goto try_again;
1067 }
1068 return sk;
1069}
1070
1071static struct sock *raw6_get_idx(struct seq_file *seq, loff_t pos)
1072{
1073 struct sock *sk = raw6_get_first(seq);
1074 if (sk)
1075 while (pos && (sk = raw6_get_next(seq, sk)) != NULL)
1076 --pos;
1077 return pos ? NULL : sk;
1078}
1079
1080static void *raw6_seq_start(struct seq_file *seq, loff_t *pos)
1081{
1082 read_lock(&raw_v6_lock);
1083 return *pos ? raw6_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
1084}
1085
1086static void *raw6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1087{
1088 struct sock *sk;
1089
1090 if (v == SEQ_START_TOKEN)
1091 sk = raw6_get_first(seq);
1092 else
1093 sk = raw6_get_next(seq, v);
1094 ++*pos;
1095 return sk;
1096}
1097
1098static void raw6_seq_stop(struct seq_file *seq, void *v)
1099{
1100 read_unlock(&raw_v6_lock);
1101}
1102
1103static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1104{
1105 struct ipv6_pinfo *np = inet6_sk(sp);
1106 struct in6_addr *dest, *src;
1107 __u16 destp, srcp;
1108
1109 dest = &np->daddr;
1110 src = &np->rcv_saddr;
1111 destp = 0;
1112 srcp = inet_sk(sp)->num;
1113 seq_printf(seq,
1114 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1115 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1116 i,
1117 src->s6_addr32[0], src->s6_addr32[1],
1118 src->s6_addr32[2], src->s6_addr32[3], srcp,
1119 dest->s6_addr32[0], dest->s6_addr32[1],
1120 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1121 sp->sk_state,
1122 atomic_read(&sp->sk_wmem_alloc),
1123 atomic_read(&sp->sk_rmem_alloc),
1124 0, 0L, 0,
1125 sock_i_uid(sp), 0,
1126 sock_i_ino(sp),
1127 atomic_read(&sp->sk_refcnt), sp);
1128}
1129
1130static int raw6_seq_show(struct seq_file *seq, void *v)
1131{
1132 if (v == SEQ_START_TOKEN)
1133 seq_printf(seq,
1134 " sl "
1135 "local_address "
1136 "remote_address "
1137 "st tx_queue rx_queue tr tm->when retrnsmt"
1138 " uid timeout inode\n");
1139 else
1140 raw6_sock_seq_show(seq, v, raw6_seq_private(seq)->bucket);
1141 return 0;
1142}
1143
1144static struct seq_operations raw6_seq_ops = {
1145 .start = raw6_seq_start,
1146 .next = raw6_seq_next,
1147 .stop = raw6_seq_stop,
1148 .show = raw6_seq_show,
1149};
1150
1151static int raw6_seq_open(struct inode *inode, struct file *file)
1152{
1153 struct seq_file *seq;
1154 int rc = -ENOMEM;
1155 struct raw6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
1156 if (!s)
1157 goto out;
1158 rc = seq_open(file, &raw6_seq_ops);
1159 if (rc)
1160 goto out_kfree;
1161 seq = file->private_data;
1162 seq->private = s;
1163 memset(s, 0, sizeof(*s));
1164out:
1165 return rc;
1166out_kfree:
1167 kfree(s);
1168 goto out;
1169}
1170
1171static struct file_operations raw6_seq_fops = {
1172 .owner = THIS_MODULE,
1173 .open = raw6_seq_open,
1174 .read = seq_read,
1175 .llseek = seq_lseek,
1176 .release = seq_release_private,
1177};
1178
1179int __init raw6_proc_init(void)
1180{
1181 if (!proc_net_fops_create("raw6", S_IRUGO, &raw6_seq_fops))
1182 return -ENOMEM;
1183 return 0;
1184}
1185
1186void raw6_proc_exit(void)
1187{
1188 proc_net_remove("raw6");
1189}
1190#endif /* CONFIG_PROC_FS */
kernel source for telekom puls (alcatel/mediatek)