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[PATCH] filemap_getpage can block when MAP_NONBLOCK specified
[pv_ops_mirror.git] / net / ipv6 / raw.c
blob5488ad0de4f6bd227665657fc65b7fce4fafcca4
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>
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
52 #include <net/rawv6.h>
53 #include <net/xfrm.h>
54
55 #include <linux/proc_fs.h>
56 #include <linux/seq_file.h>
57
58 struct hlist_head raw_v6_htable[RAWV6_HTABLE_SIZE];
59 DEFINE_RWLOCK(raw_v6_lock);
60
61 static void raw_v6_hash(struct sock *sk)
62 {
63 struct hlist_head *list = &raw_v6_htable[inet_sk(sk)->num &
64 (RAWV6_HTABLE_SIZE - 1)];
65
66 write_lock_bh(&raw_v6_lock);
67 sk_add_node(sk, list);
68 sock_prot_inc_use(sk->sk_prot);
69 write_unlock_bh(&raw_v6_lock);
70 }
71
72 static void raw_v6_unhash(struct sock *sk)
73 {
74 write_lock_bh(&raw_v6_lock);
75 if (sk_del_node_init(sk))
76 sock_prot_dec_use(sk->sk_prot);
77 write_unlock_bh(&raw_v6_lock);
78 }
79
80
81 /* Grumble... icmp and ip_input want to get at this... */
82 struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num,
83 struct in6_addr *loc_addr, struct in6_addr *rmt_addr)
84 {
85 struct hlist_node *node;
86 int is_multicast = ipv6_addr_is_multicast(loc_addr);
87
88 sk_for_each_from(sk, node)
89 if (inet_sk(sk)->num == num) {
90 struct ipv6_pinfo *np = inet6_sk(sk);
91
92 if (!ipv6_addr_any(&np->daddr) &&
93 !ipv6_addr_equal(&np->daddr, rmt_addr))
94 continue;
95
96 if (!ipv6_addr_any(&np->rcv_saddr)) {
97 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
98 goto found;
99 if (is_multicast &&
100 inet6_mc_check(sk, loc_addr, rmt_addr))
101 goto found;
102 continue;
103 }
104 goto found;
105 }
106 sk = NULL;
107 found:
108 return sk;
109 }
110
111 /*
112 * 0 - deliver
113 * 1 - block
114 */
115 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb)
116 {
117 struct icmp6hdr *icmph;
118 struct raw6_sock *rp = raw6_sk(sk);
119
120 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) {
121 __u32 *data = &rp->filter.data[0];
122 int bit_nr;
123
124 icmph = (struct icmp6hdr *) skb->data;
125 bit_nr = icmph->icmp6_type;
126
127 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0;
128 }
129 return 0;
130 }
131
132 /*
133 * demultiplex raw sockets.
134 * (should consider queueing the skb in the sock receive_queue
135 * without calling rawv6.c)
136 *
137 * Caller owns SKB so we must make clones.
138 */
139 void ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
140 {
141 struct in6_addr *saddr;
142 struct in6_addr *daddr;
143 struct sock *sk;
144 __u8 hash;
145
146 saddr = &skb->nh.ipv6h->saddr;
147 daddr = saddr + 1;
148
149 hash = nexthdr & (MAX_INET_PROTOS - 1);
150
151 read_lock(&raw_v6_lock);
152 sk = sk_head(&raw_v6_htable[hash]);
153
154 /*
155 * The first socket found will be delivered after
156 * delivery to transport protocols.
157 */
158
159 if (sk == NULL)
160 goto out;
161
162 sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr);
163
164 while (sk) {
165 if (nexthdr != IPPROTO_ICMPV6 || !icmpv6_filter(sk, skb)) {
166 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
167
168 /* Not releasing hash table! */
169 if (clone)
170 rawv6_rcv(sk, clone);
171 }
172 sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr);
173 }
174 out:
175 read_unlock(&raw_v6_lock);
176 }
177
178 /* This cleans up af_inet6 a bit. -DaveM */
179 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
180 {
181 struct inet_sock *inet = inet_sk(sk);
182 struct ipv6_pinfo *np = inet6_sk(sk);
183 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
184 __u32 v4addr = 0;
185 int addr_type;
186 int err;
187
188 if (addr_len < SIN6_LEN_RFC2133)
189 return -EINVAL;
190 addr_type = ipv6_addr_type(&addr->sin6_addr);
191
192 /* Raw sockets are IPv6 only */
193 if (addr_type == IPV6_ADDR_MAPPED)
194 return(-EADDRNOTAVAIL);
195
196 lock_sock(sk);
197
198 err = -EINVAL;
199 if (sk->sk_state != TCP_CLOSE)
200 goto out;
201
202 /* Check if the address belongs to the host. */
203 if (addr_type != IPV6_ADDR_ANY) {
204 struct net_device *dev = NULL;
205
206 if (addr_type & IPV6_ADDR_LINKLOCAL) {
207 if (addr_len >= sizeof(struct sockaddr_in6) &&
208 addr->sin6_scope_id) {
209 /* Override any existing binding, if another
210 * one is supplied by user.
211 */
212 sk->sk_bound_dev_if = addr->sin6_scope_id;
213 }
214
215 /* Binding to link-local address requires an interface */
216 if (!sk->sk_bound_dev_if)
217 goto out;
218
219 dev = dev_get_by_index(sk->sk_bound_dev_if);
220 if (!dev) {
221 err = -ENODEV;
222 goto out;
223 }
224 }
225
226 /* ipv4 addr of the socket is invalid. Only the
227 * unspecified and mapped address have a v4 equivalent.
228 */
229 v4addr = LOOPBACK4_IPV6;
230 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
231 err = -EADDRNOTAVAIL;
232 if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
233 if (dev)
234 dev_put(dev);
235 goto out;
236 }
237 }
238 if (dev)
239 dev_put(dev);
240 }
241
242 inet->rcv_saddr = inet->saddr = v4addr;
243 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
244 if (!(addr_type & IPV6_ADDR_MULTICAST))
245 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
246 err = 0;
247 out:
248 release_sock(sk);
249 return err;
250 }
251
252 void rawv6_err(struct sock *sk, struct sk_buff *skb,
253 struct inet6_skb_parm *opt,
254 int type, int code, int offset, u32 info)
255 {
256 struct inet_sock *inet = inet_sk(sk);
257 struct ipv6_pinfo *np = inet6_sk(sk);
258 int err;
259 int harderr;
260
261 /* Report error on raw socket, if:
262 1. User requested recverr.
263 2. Socket is connected (otherwise the error indication
264 is useless without recverr and error is hard.
265 */
266 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
267 return;
268
269 harderr = icmpv6_err_convert(type, code, &err);
270 if (type == ICMPV6_PKT_TOOBIG)
271 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
272
273 if (np->recverr) {
274 u8 *payload = skb->data;
275 if (!inet->hdrincl)
276 payload += offset;
277 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
278 }
279
280 if (np->recverr || harderr) {
281 sk->sk_err = err;
282 sk->sk_error_report(sk);
283 }
284 }
285
286 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
287 {
288 if ((raw6_sk(sk)->checksum || sk->sk_filter) &&
289 skb->ip_summed != CHECKSUM_UNNECESSARY) {
290 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
291 /* FIXME: increment a raw6 drops counter here */
292 kfree_skb(skb);
293 return 0;
294 }
295 skb->ip_summed = CHECKSUM_UNNECESSARY;
296 }
297
298 /* Charge it to the socket. */
299 if (sock_queue_rcv_skb(sk,skb)<0) {
300 /* FIXME: increment a raw6 drops counter here */
301 kfree_skb(skb);
302 return 0;
303 }
304
305 return 0;
306 }
307
308 /*
309 * This is next to useless...
310 * if we demultiplex in network layer we don't need the extra call
311 * just to queue the skb...
312 * maybe we could have the network decide upon a hint if it
313 * should call raw_rcv for demultiplexing
314 */
315 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
316 {
317 struct inet_sock *inet = inet_sk(sk);
318 struct raw6_sock *rp = raw6_sk(sk);
319
320 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
321 kfree_skb(skb);
322 return NET_RX_DROP;
323 }
324
325 if (!rp->checksum)
326 skb->ip_summed = CHECKSUM_UNNECESSARY;
327
328 if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
329 if (skb->ip_summed == CHECKSUM_HW) {
330 skb->ip_summed = CHECKSUM_UNNECESSARY;
331 if (csum_ipv6_magic(&skb->nh.ipv6h->saddr,
332 &skb->nh.ipv6h->daddr,
333 skb->len, inet->num, skb->csum)) {
334 LIMIT_NETDEBUG(
335 printk(KERN_DEBUG "raw v6 hw csum failure.\n"));
336 skb->ip_summed = CHECKSUM_NONE;
337 }
338 }
339 if (skb->ip_summed == CHECKSUM_NONE)
340 skb->csum = ~csum_ipv6_magic(&skb->nh.ipv6h->saddr,
341 &skb->nh.ipv6h->daddr,
342 skb->len, inet->num, 0);
343 }
344
345 if (inet->hdrincl) {
346 if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
347 (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
348 /* FIXME: increment a raw6 drops counter here */
349 kfree_skb(skb);
350 return 0;
351 }
352 skb->ip_summed = CHECKSUM_UNNECESSARY;
353 }
354
355 rawv6_rcv_skb(sk, skb);
356 return 0;
357 }
358
359
360 /*
361 * This should be easy, if there is something there
362 * we return it, otherwise we block.
363 */
364
365 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
366 struct msghdr *msg, size_t len,
367 int noblock, int flags, int *addr_len)
368 {
369 struct ipv6_pinfo *np = inet6_sk(sk);
370 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
371 struct sk_buff *skb;
372 size_t copied;
373 int err;
374
375 if (flags & MSG_OOB)
376 return -EOPNOTSUPP;
377
378 if (addr_len)
379 *addr_len=sizeof(*sin6);
380
381 if (flags & MSG_ERRQUEUE)
382 return ipv6_recv_error(sk, msg, len);
383
384 skb = skb_recv_datagram(sk, flags, noblock, &err);
385 if (!skb)
386 goto out;
387
388 copied = skb->len;
389 if (copied > len) {
390 copied = len;
391 msg->msg_flags |= MSG_TRUNC;
392 }
393
394 if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
395 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
396 } else if (msg->msg_flags&MSG_TRUNC) {
397 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
398 goto csum_copy_err;
399 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
400 } else {
401 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
402 if (err == -EINVAL)
403 goto csum_copy_err;
404 }
405 if (err)
406 goto out_free;
407
408 /* Copy the address. */
409 if (sin6) {
410 sin6->sin6_family = AF_INET6;
411 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
412 sin6->sin6_flowinfo = 0;
413 sin6->sin6_scope_id = 0;
414 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
415 sin6->sin6_scope_id = IP6CB(skb)->iif;
416 }
417
418 sock_recv_timestamp(msg, sk, skb);
419
420 if (np->rxopt.all)
421 datagram_recv_ctl(sk, msg, skb);
422
423 err = copied;
424 if (flags & MSG_TRUNC)
425 err = skb->len;
426
427 out_free:
428 skb_free_datagram(sk, skb);
429 out:
430 return err;
431
432 csum_copy_err:
433 /* Clear queue. */
434 if (flags&MSG_PEEK) {
435 int clear = 0;
436 spin_lock_irq(&sk->sk_receive_queue.lock);
437 if (skb == skb_peek(&sk->sk_receive_queue)) {
438 __skb_unlink(skb, &sk->sk_receive_queue);
439 clear = 1;
440 }
441 spin_unlock_irq(&sk->sk_receive_queue.lock);
442 if (clear)
443 kfree_skb(skb);
444 }
445
446 /* Error for blocking case is chosen to masquerade
447 as some normal condition.
448 */
449 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
450 /* FIXME: increment a raw6 drops counter here */
451 goto out_free;
452 }
453
454 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
455 struct raw6_sock *rp, int len)
456 {
457 struct sk_buff *skb;
458 int err = 0;
459 u16 *csum;
460 u32 tmp_csum;
461
462 if (!rp->checksum)
463 goto send;
464
465 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
466 goto out;
467
468 if (rp->offset + 1 < len)
469 csum = (u16 *)(skb->h.raw + rp->offset);
470 else {
471 err = -EINVAL;
472 goto out;
473 }
474
475 /* should be check HW csum miyazawa */
476 if (skb_queue_len(&sk->sk_write_queue) == 1) {
477 /*
478 * Only one fragment on the socket.
479 */
480 tmp_csum = skb->csum;
481 } else {
482 tmp_csum = 0;
483
484 skb_queue_walk(&sk->sk_write_queue, skb) {
485 tmp_csum = csum_add(tmp_csum, skb->csum);
486 }
487 }
488
489 /* in case cksum was not initialized */
490 if (unlikely(*csum))
491 tmp_csum = csum_sub(tmp_csum, *csum);
492
493 *csum = csum_ipv6_magic(&fl->fl6_src,
494 &fl->fl6_dst,
495 len, fl->proto, tmp_csum);
496
497 if (*csum == 0)
498 *csum = -1;
499 send:
500 err = ip6_push_pending_frames(sk);
501 out:
502 return err;
503 }
504
505 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
506 struct flowi *fl, struct rt6_info *rt,
507 unsigned int flags)
508 {
509 struct inet_sock *inet = inet_sk(sk);
510 struct ipv6hdr *iph;
511 struct sk_buff *skb;
512 unsigned int hh_len;
513 int err;
514
515 if (length > rt->u.dst.dev->mtu) {
516 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu);
517 return -EMSGSIZE;
518 }
519 if (flags&MSG_PROBE)
520 goto out;
521
522 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
523
524 skb = sock_alloc_send_skb(sk, length+hh_len+15,
525 flags&MSG_DONTWAIT, &err);
526 if (skb == NULL)
527 goto error;
528 skb_reserve(skb, hh_len);
529
530 skb->priority = sk->sk_priority;
531 skb->dst = dst_clone(&rt->u.dst);
532
533 skb->nh.ipv6h = iph = (struct ipv6hdr *)skb_put(skb, length);
534
535 skb->ip_summed = CHECKSUM_NONE;
536
537 skb->h.raw = skb->nh.raw;
538 err = memcpy_fromiovecend((void *)iph, from, 0, length);
539 if (err)
540 goto error_fault;
541
542 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
543 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
544 dst_output);
545 if (err > 0)
546 err = inet->recverr ? net_xmit_errno(err) : 0;
547 if (err)
548 goto error;
549 out:
550 return 0;
551
552 error_fault:
553 err = -EFAULT;
554 kfree_skb(skb);
555 error:
556 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
557 return err;
558 }
559
560 static void rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
561 {
562 struct iovec *iov;
563 u8 __user *type = NULL;
564 u8 __user *code = NULL;
565 int probed = 0;
566 int i;
567
568 if (!msg->msg_iov)
569 return;
570
571 for (i = 0; i < msg->msg_iovlen; i++) {
572 iov = &msg->msg_iov[i];
573 if (!iov)
574 continue;
575
576 switch (fl->proto) {
577 case IPPROTO_ICMPV6:
578 /* check if one-byte field is readable or not. */
579 if (iov->iov_base && iov->iov_len < 1)
580 break;
581
582 if (!type) {
583 type = iov->iov_base;
584 /* check if code field is readable or not. */
585 if (iov->iov_len > 1)
586 code = type + 1;
587 } else if (!code)
588 code = iov->iov_base;
589
590 if (type && code) {
591 get_user(fl->fl_icmp_type, type);
592 __get_user(fl->fl_icmp_code, code);
593 probed = 1;
594 }
595 break;
596 default:
597 probed = 1;
598 break;
599 }
600 if (probed)
601 break;
602 }
603 }
604
605 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
606 struct msghdr *msg, size_t len)
607 {
608 struct ipv6_txoptions opt_space;
609 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
610 struct in6_addr *daddr, *final_p = NULL, final;
611 struct inet_sock *inet = inet_sk(sk);
612 struct ipv6_pinfo *np = inet6_sk(sk);
613 struct raw6_sock *rp = raw6_sk(sk);
614 struct ipv6_txoptions *opt = NULL;
615 struct ip6_flowlabel *flowlabel = NULL;
616 struct dst_entry *dst = NULL;
617 struct flowi fl;
618 int addr_len = msg->msg_namelen;
619 int hlimit = -1;
620 u16 proto;
621 int err;
622
623 /* Rough check on arithmetic overflow,
624 better check is made in ip6_build_xmit
625 */
626 if (len < 0)
627 return -EMSGSIZE;
628
629 /* Mirror BSD error message compatibility */
630 if (msg->msg_flags & MSG_OOB)
631 return -EOPNOTSUPP;
632
633 /*
634 * Get and verify the address.
635 */
636 memset(&fl, 0, sizeof(fl));
637
638 if (sin6) {
639 if (addr_len < SIN6_LEN_RFC2133)
640 return -EINVAL;
641
642 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
643 return(-EAFNOSUPPORT);
644
645 /* port is the proto value [0..255] carried in nexthdr */
646 proto = ntohs(sin6->sin6_port);
647
648 if (!proto)
649 proto = inet->num;
650 else if (proto != inet->num)
651 return(-EINVAL);
652
653 if (proto > 255)
654 return(-EINVAL);
655
656 daddr = &sin6->sin6_addr;
657 if (np->sndflow) {
658 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
659 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
660 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
661 if (flowlabel == NULL)
662 return -EINVAL;
663 daddr = &flowlabel->dst;
664 }
665 }
666
667 /*
668 * Otherwise it will be difficult to maintain
669 * sk->sk_dst_cache.
670 */
671 if (sk->sk_state == TCP_ESTABLISHED &&
672 ipv6_addr_equal(daddr, &np->daddr))
673 daddr = &np->daddr;
674
675 if (addr_len >= sizeof(struct sockaddr_in6) &&
676 sin6->sin6_scope_id &&
677 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
678 fl.oif = sin6->sin6_scope_id;
679 } else {
680 if (sk->sk_state != TCP_ESTABLISHED)
681 return -EDESTADDRREQ;
682
683 proto = inet->num;
684 daddr = &np->daddr;
685 fl.fl6_flowlabel = np->flow_label;
686 }
687
688 if (ipv6_addr_any(daddr)) {
689 /*
690 * unspecified destination address
691 * treated as error... is this correct ?
692 */
693 fl6_sock_release(flowlabel);
694 return(-EINVAL);
695 }
696
697 if (fl.oif == 0)
698 fl.oif = sk->sk_bound_dev_if;
699
700 if (msg->msg_controllen) {
701 opt = &opt_space;
702 memset(opt, 0, sizeof(struct ipv6_txoptions));
703 opt->tot_len = sizeof(struct ipv6_txoptions);
704
705 err = datagram_send_ctl(msg, &fl, opt, &hlimit);
706 if (err < 0) {
707 fl6_sock_release(flowlabel);
708 return err;
709 }
710 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
711 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
712 if (flowlabel == NULL)
713 return -EINVAL;
714 }
715 if (!(opt->opt_nflen|opt->opt_flen))
716 opt = NULL;
717 }
718 if (opt == NULL)
719 opt = np->opt;
720 if (flowlabel)
721 opt = fl6_merge_options(&opt_space, flowlabel, opt);
722
723 fl.proto = proto;
724 rawv6_probe_proto_opt(&fl, msg);
725
726 ipv6_addr_copy(&fl.fl6_dst, daddr);
727 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
728 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
729
730 /* merge ip6_build_xmit from ip6_output */
731 if (opt && opt->srcrt) {
732 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
733 ipv6_addr_copy(&final, &fl.fl6_dst);
734 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
735 final_p = &final;
736 }
737
738 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
739 fl.oif = np->mcast_oif;
740
741 err = ip6_dst_lookup(sk, &dst, &fl);
742 if (err)
743 goto out;
744 if (final_p)
745 ipv6_addr_copy(&fl.fl6_dst, final_p);
746
747 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
748 dst_release(dst);
749 goto out;
750 }
751
752 if (hlimit < 0) {
753 if (ipv6_addr_is_multicast(&fl.fl6_dst))
754 hlimit = np->mcast_hops;
755 else
756 hlimit = np->hop_limit;
757 if (hlimit < 0)
758 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
759 if (hlimit < 0)
760 hlimit = ipv6_get_hoplimit(dst->dev);
761 }
762
763 if (msg->msg_flags&MSG_CONFIRM)
764 goto do_confirm;
765
766 back_from_confirm:
767 if (inet->hdrincl) {
768 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags);
769 } else {
770 lock_sock(sk);
771 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0,
772 hlimit, opt, &fl, (struct rt6_info*)dst, msg->msg_flags);
773
774 if (err)
775 ip6_flush_pending_frames(sk);
776 else if (!(msg->msg_flags & MSG_MORE))
777 err = rawv6_push_pending_frames(sk, &fl, rp, len);
778 }
779 done:
780 ip6_dst_store(sk, dst,
781 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
782 &np->daddr : NULL);
783 if (err > 0)
784 err = np->recverr ? net_xmit_errno(err) : 0;
785
786 release_sock(sk);
787 out:
788 fl6_sock_release(flowlabel);
789 return err<0?err:len;
790 do_confirm:
791 dst_confirm(dst);
792 if (!(msg->msg_flags & MSG_PROBE) || len)
793 goto back_from_confirm;
794 err = 0;
795 goto done;
796 }
797
798 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
799 char __user *optval, int optlen)
800 {
801 switch (optname) {
802 case ICMPV6_FILTER:
803 if (optlen > sizeof(struct icmp6_filter))
804 optlen = sizeof(struct icmp6_filter);
805 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
806 return -EFAULT;
807 return 0;
808 default:
809 return -ENOPROTOOPT;
810 };
811
812 return 0;
813 }
814
815 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
816 char __user *optval, int __user *optlen)
817 {
818 int len;
819
820 switch (optname) {
821 case ICMPV6_FILTER:
822 if (get_user(len, optlen))
823 return -EFAULT;
824 if (len < 0)
825 return -EINVAL;
826 if (len > sizeof(struct icmp6_filter))
827 len = sizeof(struct icmp6_filter);
828 if (put_user(len, optlen))
829 return -EFAULT;
830 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
831 return -EFAULT;
832 return 0;
833 default:
834 return -ENOPROTOOPT;
835 };
836
837 return 0;
838 }
839
840
841 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
842 char __user *optval, int optlen)
843 {
844 struct raw6_sock *rp = raw6_sk(sk);
845 int val;
846
847 switch(level) {
848 case SOL_RAW:
849 break;
850
851 case SOL_ICMPV6:
852 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
853 return -EOPNOTSUPP;
854 return rawv6_seticmpfilter(sk, level, optname, optval,
855 optlen);
856 case SOL_IPV6:
857 if (optname == IPV6_CHECKSUM)
858 break;
859 default:
860 return ipv6_setsockopt(sk, level, optname, optval,
861 optlen);
862 };
863
864 if (get_user(val, (int __user *)optval))
865 return -EFAULT;
866
867 switch (optname) {
868 case IPV6_CHECKSUM:
869 /* You may get strange result with a positive odd offset;
870 RFC2292bis agrees with me. */
871 if (val > 0 && (val&1))
872 return(-EINVAL);
873 if (val < 0) {
874 rp->checksum = 0;
875 } else {
876 rp->checksum = 1;
877 rp->offset = val;
878 }
879
880 return 0;
881 break;
882
883 default:
884 return(-ENOPROTOOPT);
885 }
886 }
887
888 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
889 char __user *optval, int __user *optlen)
890 {
891 struct raw6_sock *rp = raw6_sk(sk);
892 int val, len;
893
894 switch(level) {
895 case SOL_RAW:
896 break;
897
898 case SOL_ICMPV6:
899 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
900 return -EOPNOTSUPP;
901 return rawv6_geticmpfilter(sk, level, optname, optval,
902 optlen);
903 case SOL_IPV6:
904 if (optname == IPV6_CHECKSUM)
905 break;
906 default:
907 return ipv6_getsockopt(sk, level, optname, optval,
908 optlen);
909 };
910
911 if (get_user(len,optlen))
912 return -EFAULT;
913
914 switch (optname) {
915 case IPV6_CHECKSUM:
916 if (rp->checksum == 0)
917 val = -1;
918 else
919 val = rp->offset;
920 break;
921
922 default:
923 return -ENOPROTOOPT;
924 }
925
926 len = min_t(unsigned int, sizeof(int), len);
927
928 if (put_user(len, optlen))
929 return -EFAULT;
930 if (copy_to_user(optval,&val,len))
931 return -EFAULT;
932 return 0;
933 }
934
935 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
936 {
937 switch(cmd) {
938 case SIOCOUTQ:
939 {
940 int amount = atomic_read(&sk->sk_wmem_alloc);
941 return put_user(amount, (int __user *)arg);
942 }
943 case SIOCINQ:
944 {
945 struct sk_buff *skb;
946 int amount = 0;
947
948 spin_lock_irq(&sk->sk_receive_queue.lock);
949 skb = skb_peek(&sk->sk_receive_queue);
950 if (skb != NULL)
951 amount = skb->tail - skb->h.raw;
952 spin_unlock_irq(&sk->sk_receive_queue.lock);
953 return put_user(amount, (int __user *)arg);
954 }
955
956 default:
957 return -ENOIOCTLCMD;
958 }
959 }
960
961 static void rawv6_close(struct sock *sk, long timeout)
962 {
963 if (inet_sk(sk)->num == IPPROTO_RAW)
964 ip6_ra_control(sk, -1, NULL);
965
966 sk_common_release(sk);
967 }
968
969 static int rawv6_init_sk(struct sock *sk)
970 {
971 if (inet_sk(sk)->num == IPPROTO_ICMPV6) {
972 struct raw6_sock *rp = raw6_sk(sk);
973 rp->checksum = 1;
974 rp->offset = 2;
975 }
976 return(0);
977 }
978
979 struct proto rawv6_prot = {
980 .name = "RAWv6",
981 .owner = THIS_MODULE,
982 .close = rawv6_close,
983 .connect = ip6_datagram_connect,
984 .disconnect = udp_disconnect,
985 .ioctl = rawv6_ioctl,
986 .init = rawv6_init_sk,
987 .destroy = inet6_destroy_sock,
988 .setsockopt = rawv6_setsockopt,
989 .getsockopt = rawv6_getsockopt,
990 .sendmsg = rawv6_sendmsg,
991 .recvmsg = rawv6_recvmsg,
992 .bind = rawv6_bind,
993 .backlog_rcv = rawv6_rcv_skb,
994 .hash = raw_v6_hash,
995 .unhash = raw_v6_unhash,
996 .obj_size = sizeof(struct raw6_sock),
997 };
998
999 #ifdef CONFIG_PROC_FS
1000 struct raw6_iter_state {
1001 int bucket;
1002 };
1003
1004 #define raw6_seq_private(seq) ((struct raw6_iter_state *)(seq)->private)
1005
1006 static struct sock *raw6_get_first(struct seq_file *seq)
1007 {
1008 struct sock *sk;
1009 struct hlist_node *node;
1010 struct raw6_iter_state* state = raw6_seq_private(seq);
1011
1012 for (state->bucket = 0; state->bucket < RAWV6_HTABLE_SIZE; ++state->bucket)
1013 sk_for_each(sk, node, &raw_v6_htable[state->bucket])
1014 if (sk->sk_family == PF_INET6)
1015 goto out;
1016 sk = NULL;
1017 out:
1018 return sk;
1019 }
1020
1021 static struct sock *raw6_get_next(struct seq_file *seq, struct sock *sk)
1022 {
1023 struct raw6_iter_state* state = raw6_seq_private(seq);
1024
1025 do {
1026 sk = sk_next(sk);
1027 try_again:
1028 ;
1029 } while (sk && sk->sk_family != PF_INET6);
1030
1031 if (!sk && ++state->bucket < RAWV6_HTABLE_SIZE) {
1032 sk = sk_head(&raw_v6_htable[state->bucket]);
1033 goto try_again;
1034 }
1035 return sk;
1036 }
1037
1038 static struct sock *raw6_get_idx(struct seq_file *seq, loff_t pos)
1039 {
1040 struct sock *sk = raw6_get_first(seq);
1041 if (sk)
1042 while (pos && (sk = raw6_get_next(seq, sk)) != NULL)
1043 --pos;
1044 return pos ? NULL : sk;
1045 }
1046
1047 static void *raw6_seq_start(struct seq_file *seq, loff_t *pos)
1048 {
1049 read_lock(&raw_v6_lock);
1050 return *pos ? raw6_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
1051 }
1052
1053 static void *raw6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1054 {
1055 struct sock *sk;
1056
1057 if (v == SEQ_START_TOKEN)
1058 sk = raw6_get_first(seq);
1059 else
1060 sk = raw6_get_next(seq, v);
1061 ++*pos;
1062 return sk;
1063 }
1064
1065 static void raw6_seq_stop(struct seq_file *seq, void *v)
1066 {
1067 read_unlock(&raw_v6_lock);
1068 }
1069
1070 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1071 {
1072 struct ipv6_pinfo *np = inet6_sk(sp);
1073 struct in6_addr *dest, *src;
1074 __u16 destp, srcp;
1075
1076 dest = &np->daddr;
1077 src = &np->rcv_saddr;
1078 destp = 0;
1079 srcp = inet_sk(sp)->num;
1080 seq_printf(seq,
1081 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1082 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
1083 i,
1084 src->s6_addr32[0], src->s6_addr32[1],
1085 src->s6_addr32[2], src->s6_addr32[3], srcp,
1086 dest->s6_addr32[0], dest->s6_addr32[1],
1087 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1088 sp->sk_state,
1089 atomic_read(&sp->sk_wmem_alloc),
1090 atomic_read(&sp->sk_rmem_alloc),
1091 0, 0L, 0,
1092 sock_i_uid(sp), 0,
1093 sock_i_ino(sp),
1094 atomic_read(&sp->sk_refcnt), sp);
1095 }
1096
1097 static int raw6_seq_show(struct seq_file *seq, void *v)
1098 {
1099 if (v == SEQ_START_TOKEN)
1100 seq_printf(seq,
1101 " sl "
1102 "local_address "
1103 "remote_address "
1104 "st tx_queue rx_queue tr tm->when retrnsmt"
1105 " uid timeout inode\n");
1106 else
1107 raw6_sock_seq_show(seq, v, raw6_seq_private(seq)->bucket);
1108 return 0;
1109 }
1110
1111 static struct seq_operations raw6_seq_ops = {
1112 .start = raw6_seq_start,
1113 .next = raw6_seq_next,
1114 .stop = raw6_seq_stop,
1115 .show = raw6_seq_show,
1116 };
1117
1118 static int raw6_seq_open(struct inode *inode, struct file *file)
1119 {
1120 struct seq_file *seq;
1121 int rc = -ENOMEM;
1122 struct raw6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
1123 if (!s)
1124 goto out;
1125 rc = seq_open(file, &raw6_seq_ops);
1126 if (rc)
1127 goto out_kfree;
1128 seq = file->private_data;
1129 seq->private = s;
1130 memset(s, 0, sizeof(*s));
1131 out:
1132 return rc;
1133 out_kfree:
1134 kfree(s);
1135 goto out;
1136 }
1137
1138 static struct file_operations raw6_seq_fops = {
1139 .owner = THIS_MODULE,
1140 .open = raw6_seq_open,
1141 .read = seq_read,
1142 .llseek = seq_lseek,
1143 .release = seq_release_private,
1144 };
1145
1146 int __init raw6_proc_init(void)
1147 {
1148 if (!proc_net_fops_create("raw6", S_IRUGO, &raw6_seq_fops))
1149 return -ENOMEM;
1150 return 0;
1151 }
1152
1153 void raw6_proc_exit(void)
1154 {
1155 proc_net_remove("raw6");
1156 }
1157 #endif /* CONFIG_PROC_FS */
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