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Merge with Linux 2.5.74.
[linux-2.6/linux-mips.git] / net / ipv6 / raw.c
blobd1b44f4b8134ad38672b2a3f997b51a73b824b2f
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/sock.h>
39 #include <net/snmp.h>
40
41 #include <net/ipv6.h>
42 #include <net/ndisc.h>
43 #include <net/protocol.h>
44 #include <net/ip6_route.h>
45 #include <net/addrconf.h>
46 #include <net/transp_v6.h>
47 #include <net/udp.h>
48 #include <net/inet_common.h>
49
50 #include <net/rawv6.h>
51 #include <net/xfrm.h>
52
53 #include <linux/proc_fs.h>
54 #include <linux/seq_file.h>
55
56 struct hlist_head raw_v6_htable[RAWV6_HTABLE_SIZE];
57 rwlock_t raw_v6_lock = RW_LOCK_UNLOCKED;
58
59 static void raw_v6_hash(struct sock *sk)
60 {
61 struct hlist_head *list = &raw_v6_htable[inet_sk(sk)->num &
62 (RAWV6_HTABLE_SIZE - 1)];
63
64 write_lock_bh(&raw_v6_lock);
65 sk_add_node(sk, list);
66 sock_prot_inc_use(sk->sk_prot);
67 write_unlock_bh(&raw_v6_lock);
68 }
69
70 static void raw_v6_unhash(struct sock *sk)
71 {
72 write_lock_bh(&raw_v6_lock);
73 if (sk_del_node_init(sk))
74 sock_prot_dec_use(sk->sk_prot);
75 write_unlock_bh(&raw_v6_lock);
76 }
77
78
79 /* Grumble... icmp and ip_input want to get at this... */
80 struct sock *__raw_v6_lookup(struct sock *sk, unsigned short num,
81 struct in6_addr *loc_addr, struct in6_addr *rmt_addr)
82 {
83 struct hlist_node *node;
84 int addr_type = ipv6_addr_type(loc_addr);
85
86 sk_for_each_from(sk, node)
87 if (inet_sk(sk)->num == num) {
88 struct ipv6_pinfo *np = inet6_sk(sk);
89
90 if (!ipv6_addr_any(&np->daddr) &&
91 ipv6_addr_cmp(&np->daddr, rmt_addr))
92 continue;
93
94 if (!ipv6_addr_any(&np->rcv_saddr)) {
95 if (!ipv6_addr_cmp(&np->rcv_saddr, loc_addr))
96 goto found;
97 if ((addr_type & IPV6_ADDR_MULTICAST) &&
98 inet6_mc_check(sk, loc_addr, rmt_addr))
99 goto found;
100 continue;
101 }
102 goto found;
103 }
104 sk = NULL;
105 found:
106 return sk;
107 }
108
109 /*
110 * 0 - deliver
111 * 1 - block
112 */
113 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb)
114 {
115 struct icmp6hdr *icmph;
116 struct raw6_opt *opt = raw6_sk(sk);
117
118 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) {
119 __u32 *data = &opt->filter.data[0];
120 int bit_nr;
121
122 icmph = (struct icmp6hdr *) skb->data;
123 bit_nr = icmph->icmp6_type;
124
125 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0;
126 }
127 return 0;
128 }
129
130 /*
131 * demultiplex raw sockets.
132 * (should consider queueing the skb in the sock receive_queue
133 * without calling rawv6.c)
134 *
135 * Caller owns SKB so we must make clones.
136 */
137 void ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
138 {
139 struct in6_addr *saddr;
140 struct in6_addr *daddr;
141 struct sock *sk;
142 __u8 hash;
143
144 saddr = &skb->nh.ipv6h->saddr;
145 daddr = saddr + 1;
146
147 hash = nexthdr & (MAX_INET_PROTOS - 1);
148
149 read_lock(&raw_v6_lock);
150 sk = sk_head(&raw_v6_htable[hash]);
151
152 /*
153 * The first socket found will be delivered after
154 * delivery to transport protocols.
155 */
156
157 if (sk == NULL)
158 goto out;
159
160 sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr);
161
162 while (sk) {
163 if (nexthdr != IPPROTO_ICMPV6 || !icmpv6_filter(sk, skb)) {
164 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
165
166 /* Not releasing hash table! */
167 if (clone)
168 rawv6_rcv(sk, clone);
169 }
170 sk = __raw_v6_lookup(sk_next(sk), nexthdr, daddr, saddr);
171 }
172 out:
173 read_unlock(&raw_v6_lock);
174 }
175
176 /* This cleans up af_inet6 a bit. -DaveM */
177 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
178 {
179 struct inet_opt *inet = inet_sk(sk);
180 struct ipv6_pinfo *np = inet6_sk(sk);
181 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
182 __u32 v4addr = 0;
183 int addr_type;
184 int err;
185
186 if (addr_len < SIN6_LEN_RFC2133)
187 return -EINVAL;
188 addr_type = ipv6_addr_type(&addr->sin6_addr);
189
190 /* Raw sockets are IPv6 only */
191 if (addr_type == IPV6_ADDR_MAPPED)
192 return(-EADDRNOTAVAIL);
193
194 lock_sock(sk);
195
196 err = -EINVAL;
197 if (sk->sk_state != TCP_CLOSE)
198 goto out;
199
200 if (addr_type & IPV6_ADDR_LINKLOCAL) {
201 if (addr_len >= sizeof(struct sockaddr_in6) &&
202 addr->sin6_scope_id) {
203 /* Override any existing binding, if another one
204 * is supplied by user.
205 */
206 sk->sk_bound_dev_if = addr->sin6_scope_id;
207 }
208
209 /* Binding to link-local address requires an interface */
210 if (!sk->sk_bound_dev_if)
211 goto out;
212 }
213
214 /* Check if the address belongs to the host. */
215 if (addr_type != IPV6_ADDR_ANY) {
216 /* ipv4 addr of the socket is invalid. Only the
217 * unpecified and mapped address have a v4 equivalent.
218 */
219 v4addr = LOOPBACK4_IPV6;
220 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
221 err = -EADDRNOTAVAIL;
222 if (!ipv6_chk_addr(&addr->sin6_addr, NULL))
223 goto out;
224 }
225 }
226
227 inet->rcv_saddr = inet->saddr = v4addr;
228 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
229 if (!(addr_type & IPV6_ADDR_MULTICAST))
230 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
231 err = 0;
232 out:
233 release_sock(sk);
234 return err;
235 }
236
237 void rawv6_err(struct sock *sk, struct sk_buff *skb,
238 struct inet6_skb_parm *opt,
239 int type, int code, int offset, u32 info)
240 {
241 struct inet_opt *inet = inet_sk(sk);
242 struct ipv6_pinfo *np = inet6_sk(sk);
243 int err;
244 int harderr;
245
246 /* Report error on raw socket, if:
247 1. User requested recverr.
248 2. Socket is connected (otherwise the error indication
249 is useless without recverr and error is hard.
250 */
251 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
252 return;
253
254 harderr = icmpv6_err_convert(type, code, &err);
255 if (type == ICMPV6_PKT_TOOBIG)
256 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
257
258 if (np->recverr) {
259 u8 *payload = skb->data;
260 if (!inet->hdrincl)
261 payload += offset;
262 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
263 }
264
265 if (np->recverr || harderr) {
266 sk->sk_err = err;
267 sk->sk_error_report(sk);
268 }
269 }
270
271 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
272 {
273 if (sk->sk_filter && skb->ip_summed != CHECKSUM_UNNECESSARY) {
274 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
275 /* FIXME: increment a raw6 drops counter here */
276 kfree_skb(skb);
277 return 0;
278 }
279 skb->ip_summed = CHECKSUM_UNNECESSARY;
280 }
281
282 /* Charge it to the socket. */
283 if (sock_queue_rcv_skb(sk,skb)<0) {
284 /* FIXME: increment a raw6 drops counter here */
285 kfree_skb(skb);
286 return 0;
287 }
288
289 return 0;
290 }
291
292 /*
293 * This is next to useless...
294 * if we demultiplex in network layer we don't need the extra call
295 * just to queue the skb...
296 * maybe we could have the network decide uppon a hint if it
297 * should call raw_rcv for demultiplexing
298 */
299 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
300 {
301 struct inet_opt *inet = inet_sk(sk);
302 struct raw6_opt *raw_opt = raw6_sk(sk);
303
304 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
305 kfree_skb(skb);
306 return NET_RX_DROP;
307 }
308
309 if (!raw_opt->checksum)
310 skb->ip_summed = CHECKSUM_UNNECESSARY;
311
312 if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
313 if (skb->ip_summed == CHECKSUM_HW) {
314 skb->ip_summed = CHECKSUM_UNNECESSARY;
315 if (csum_ipv6_magic(&skb->nh.ipv6h->saddr,
316 &skb->nh.ipv6h->daddr,
317 skb->len, inet->num, skb->csum)) {
318 NETDEBUG(if (net_ratelimit()) printk(KERN_DEBUG "raw v6 hw csum failure.\n"));
319 skb->ip_summed = CHECKSUM_NONE;
320 }
321 }
322 if (skb->ip_summed == CHECKSUM_NONE)
323 skb->csum = ~csum_ipv6_magic(&skb->nh.ipv6h->saddr,
324 &skb->nh.ipv6h->daddr,
325 skb->len, inet->num, 0);
326 }
327
328 if (inet->hdrincl) {
329 if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
330 (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
331 /* FIXME: increment a raw6 drops counter here */
332 kfree_skb(skb);
333 return 0;
334 }
335 skb->ip_summed = CHECKSUM_UNNECESSARY;
336 }
337
338 rawv6_rcv_skb(sk, skb);
339 return 0;
340 }
341
342
343 /*
344 * This should be easy, if there is something there
345 * we return it, otherwise we block.
346 */
347
348 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, int len,
349 int noblock, int flags, int *addr_len)
350 {
351 struct ipv6_pinfo *np = inet6_sk(sk);
352 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
353 struct sk_buff *skb;
354 int copied, err;
355
356 if (flags & MSG_OOB)
357 return -EOPNOTSUPP;
358
359 if (addr_len)
360 *addr_len=sizeof(*sin6);
361
362 if (flags & MSG_ERRQUEUE)
363 return ipv6_recv_error(sk, msg, len);
364
365 skb = skb_recv_datagram(sk, flags, noblock, &err);
366 if (!skb)
367 goto out;
368
369 copied = skb->len;
370 if (copied > len) {
371 copied = len;
372 msg->msg_flags |= MSG_TRUNC;
373 }
374
375 if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
376 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
377 } else if (msg->msg_flags&MSG_TRUNC) {
378 if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
379 goto csum_copy_err;
380 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
381 } else {
382 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
383 if (err == -EINVAL)
384 goto csum_copy_err;
385 }
386 if (err)
387 goto out_free;
388
389 /* Copy the address. */
390 if (sin6) {
391 sin6->sin6_family = AF_INET6;
392 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
393 sin6->sin6_flowinfo = 0;
394 sin6->sin6_scope_id = 0;
395 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
396 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
397 sin6->sin6_scope_id = opt->iif;
398 }
399 }
400
401 sock_recv_timestamp(msg, sk, skb);
402
403 if (np->rxopt.all)
404 datagram_recv_ctl(sk, msg, skb);
405 err = copied;
406
407 out_free:
408 skb_free_datagram(sk, skb);
409 out:
410 return err;
411
412 csum_copy_err:
413 /* Clear queue. */
414 if (flags&MSG_PEEK) {
415 int clear = 0;
416 spin_lock_irq(&sk->sk_receive_queue.lock);
417 if (skb == skb_peek(&sk->sk_receive_queue)) {
418 __skb_unlink(skb, &sk->sk_receive_queue);
419 clear = 1;
420 }
421 spin_unlock_irq(&sk->sk_receive_queue.lock);
422 if (clear)
423 kfree_skb(skb);
424 }
425
426 /* Error for blocking case is chosen to masquerade
427 as some normal condition.
428 */
429 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
430 /* FIXME: increment a raw6 drops counter here */
431 goto out_free;
432 }
433
434 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct raw6_opt *opt, int len)
435 {
436 struct sk_buff *skb;
437 int err = 0;
438 u16 *csum;
439
440 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
441 goto out;
442
443 if (opt->offset + 1 < len)
444 csum = (u16 *)(skb->h.raw + opt->offset);
445 else {
446 err = -EINVAL;
447 goto out;
448 }
449
450 if (skb_queue_len(&sk->sk_write_queue) == 1) {
451 /*
452 * Only one fragment on the socket.
453 */
454 /* should be check HW csum miyazawa */
455 *csum = csum_ipv6_magic(&fl->fl6_src,
456 &fl->fl6_dst,
457 len, fl->proto, skb->csum);
458 } else {
459 u32 tmp_csum = 0;
460
461 skb_queue_walk(&sk->sk_write_queue, skb) {
462 tmp_csum = csum_add(tmp_csum, skb->csum);
463 }
464
465 tmp_csum = csum_ipv6_magic(&fl->fl6_src,
466 &fl->fl6_dst,
467 len, fl->proto, tmp_csum);
468 *csum = tmp_csum;
469 }
470 if (*csum == 0)
471 *csum = -1;
472 ip6_push_pending_frames(sk);
473 out:
474 return err;
475 }
476
477 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
478 struct flowi *fl, struct rt6_info *rt,
479 unsigned int flags)
480 {
481 struct inet_opt *inet = inet_sk(sk);
482 struct ipv6hdr *iph;
483 struct sk_buff *skb;
484 unsigned int hh_len;
485 int err;
486
487 if (length > rt->u.dst.dev->mtu) {
488 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu);
489 return -EMSGSIZE;
490 }
491 if (flags&MSG_PROBE)
492 goto out;
493
494 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
495
496 skb = sock_alloc_send_skb(sk, length+hh_len+15,
497 flags&MSG_DONTWAIT, &err);
498 if (skb == NULL)
499 goto error;
500 skb_reserve(skb, hh_len);
501
502 skb->priority = sk->sk_priority;
503 skb->dst = dst_clone(&rt->u.dst);
504
505 skb->nh.ipv6h = iph = (struct ipv6hdr *)skb_put(skb, length);
506
507 skb->ip_summed = CHECKSUM_NONE;
508
509 skb->h.raw = skb->nh.raw;
510 err = memcpy_fromiovecend((void *)iph, from, 0, length);
511 if (err)
512 goto error_fault;
513
514 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
515 dst_output);
516 if (err > 0)
517 err = inet->recverr ? net_xmit_errno(err) : 0;
518 if (err)
519 goto error;
520 out:
521 return 0;
522
523 error_fault:
524 err = -EFAULT;
525 kfree_skb(skb);
526 error:
527 IP6_INC_STATS(Ip6OutDiscards);
528 return err;
529 }
530 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, int len)
531 {
532 struct ipv6_txoptions opt_space;
533 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
534 struct in6_addr *daddr;
535 struct inet_opt *inet = inet_sk(sk);
536 struct ipv6_pinfo *np = inet6_sk(sk);
537 struct raw6_opt *raw_opt = raw6_sk(sk);
538 struct ipv6_txoptions *opt = NULL;
539 struct ip6_flowlabel *flowlabel = NULL;
540 struct dst_entry *dst = NULL;
541 struct flowi fl;
542 int addr_len = msg->msg_namelen;
543 int hlimit = -1;
544 u16 proto;
545 int err;
546
547 /* Rough check on arithmetic overflow,
548 better check is made in ip6_build_xmit
549 */
550 if (len < 0)
551 return -EMSGSIZE;
552
553 /* Mirror BSD error message compatibility */
554 if (msg->msg_flags & MSG_OOB)
555 return -EOPNOTSUPP;
556
557 /*
558 * Get and verify the address.
559 */
560 memset(&fl, 0, sizeof(fl));
561
562 if (sin6) {
563 if (addr_len < SIN6_LEN_RFC2133)
564 return -EINVAL;
565
566 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
567 return(-EINVAL);
568
569 /* port is the proto value [0..255] carried in nexthdr */
570 proto = ntohs(sin6->sin6_port);
571
572 if (!proto)
573 proto = inet->num;
574 else if (proto != inet->num)
575 return(-EINVAL);
576
577 if (proto > 255)
578 return(-EINVAL);
579
580 daddr = &sin6->sin6_addr;
581 if (np->sndflow) {
582 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
583 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
584 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
585 if (flowlabel == NULL)
586 return -EINVAL;
587 daddr = &flowlabel->dst;
588 }
589 }
590
591 /*
592 * Otherwise it will be difficult to maintain
593 * sk->sk_dst_cache.
594 */
595 if (sk->sk_state == TCP_ESTABLISHED &&
596 !ipv6_addr_cmp(daddr, &np->daddr))
597 daddr = &np->daddr;
598
599 if (addr_len >= sizeof(struct sockaddr_in6) &&
600 sin6->sin6_scope_id &&
601 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
602 fl.oif = sin6->sin6_scope_id;
603 } else {
604 if (sk->sk_state != TCP_ESTABLISHED)
605 return(-EINVAL);
606
607 proto = inet->num;
608 daddr = &np->daddr;
609 fl.fl6_flowlabel = np->flow_label;
610 }
611
612 if (ipv6_addr_any(daddr)) {
613 /*
614 * unspecfied destination address
615 * treated as error... is this correct ?
616 */
617 fl6_sock_release(flowlabel);
618 return(-EINVAL);
619 }
620
621 if (fl.oif == 0)
622 fl.oif = sk->sk_bound_dev_if;
623
624 if (msg->msg_controllen) {
625 opt = &opt_space;
626 memset(opt, 0, sizeof(struct ipv6_txoptions));
627
628 err = datagram_send_ctl(msg, &fl, opt, &hlimit);
629 if (err < 0) {
630 fl6_sock_release(flowlabel);
631 return err;
632 }
633 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
634 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
635 if (flowlabel == NULL)
636 return -EINVAL;
637 }
638 if (!(opt->opt_nflen|opt->opt_flen))
639 opt = NULL;
640 }
641 if (opt == NULL)
642 opt = np->opt;
643 if (flowlabel)
644 opt = fl6_merge_options(&opt_space, flowlabel, opt);
645
646 fl.proto = proto;
647 ipv6_addr_copy(&fl.fl6_dst, daddr);
648 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
649 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
650
651 /* merge ip6_build_xmit from ip6_output */
652 if (opt && opt->srcrt) {
653 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
654 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
655 }
656
657 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
658 fl.oif = np->mcast_oif;
659
660 err = ip6_dst_lookup(sk, &dst, &fl);
661 if (err)
662 goto out;
663
664 if (hlimit < 0) {
665 if (ipv6_addr_is_multicast(&fl.fl6_dst))
666 hlimit = np->mcast_hops;
667 else
668 hlimit = np->hop_limit;
669 if (hlimit < 0)
670 hlimit = dst_metric(dst, RTAX_HOPLIMIT);
671 }
672
673 if (msg->msg_flags&MSG_CONFIRM)
674 goto do_confirm;
675
676 back_from_confirm:
677 if (inet->hdrincl) {
678 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags);
679 } else {
680 lock_sock(sk);
681 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0,
682 hlimit, opt, &fl, (struct rt6_info*)dst, msg->msg_flags);
683
684 if (err)
685 ip6_flush_pending_frames(sk);
686 else if (!(msg->msg_flags & MSG_MORE)) {
687 if (raw_opt->checksum) {
688 err = rawv6_push_pending_frames(sk, &fl, raw_opt, len);
689 } else {
690 err = ip6_push_pending_frames(sk);
691 }
692 }
693 }
694 done:
695 ip6_dst_store(sk, dst,
696 !ipv6_addr_cmp(&fl.fl6_dst, &np->daddr) ?
697 &np->daddr : NULL);
698 if (err > 0)
699 err = np->recverr ? net_xmit_errno(err) : 0;
700
701 release_sock(sk);
702 out:
703 fl6_sock_release(flowlabel);
704 return err<0?err:len;
705 do_confirm:
706 dst_confirm(dst);
707 if (!(msg->msg_flags & MSG_PROBE) || len)
708 goto back_from_confirm;
709 err = 0;
710 goto done;
711 }
712
713 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
714 char *optval, int optlen)
715 {
716 switch (optname) {
717 case ICMPV6_FILTER:
718 if (optlen > sizeof(struct icmp6_filter))
719 optlen = sizeof(struct icmp6_filter);
720 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
721 return -EFAULT;
722 return 0;
723 default:
724 return -ENOPROTOOPT;
725 };
726
727 return 0;
728 }
729
730 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
731 char *optval, int *optlen)
732 {
733 int len;
734
735 switch (optname) {
736 case ICMPV6_FILTER:
737 if (get_user(len, optlen))
738 return -EFAULT;
739 if (len < 0)
740 return -EINVAL;
741 if (len > sizeof(struct icmp6_filter))
742 len = sizeof(struct icmp6_filter);
743 if (put_user(len, optlen))
744 return -EFAULT;
745 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
746 return -EFAULT;
747 return 0;
748 default:
749 return -ENOPROTOOPT;
750 };
751
752 return 0;
753 }
754
755
756 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
757 char *optval, int optlen)
758 {
759 struct raw6_opt *opt = raw6_sk(sk);
760 int val;
761
762 switch(level) {
763 case SOL_RAW:
764 break;
765
766 case SOL_ICMPV6:
767 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
768 return -EOPNOTSUPP;
769 return rawv6_seticmpfilter(sk, level, optname, optval,
770 optlen);
771 case SOL_IPV6:
772 if (optname == IPV6_CHECKSUM)
773 break;
774 default:
775 return ipv6_setsockopt(sk, level, optname, optval,
776 optlen);
777 };
778
779 if (get_user(val, (int *)optval))
780 return -EFAULT;
781
782 switch (optname) {
783 case IPV6_CHECKSUM:
784 /* You may get strange result with a positive odd offset;
785 RFC2292bis agrees with me. */
786 if (val > 0 && (val&1))
787 return(-EINVAL);
788 if (val < 0) {
789 opt->checksum = 0;
790 } else {
791 opt->checksum = 1;
792 opt->offset = val;
793 }
794
795 return 0;
796 break;
797
798 default:
799 return(-ENOPROTOOPT);
800 }
801 }
802
803 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
804 char *optval, int *optlen)
805 {
806 struct raw6_opt *opt = raw6_sk(sk);
807 int val, len;
808
809 switch(level) {
810 case SOL_RAW:
811 break;
812
813 case SOL_ICMPV6:
814 if (inet_sk(sk)->num != IPPROTO_ICMPV6)
815 return -EOPNOTSUPP;
816 return rawv6_geticmpfilter(sk, level, optname, optval,
817 optlen);
818 case SOL_IPV6:
819 if (optname == IPV6_CHECKSUM)
820 break;
821 default:
822 return ipv6_getsockopt(sk, level, optname, optval,
823 optlen);
824 };
825
826 if (get_user(len,optlen))
827 return -EFAULT;
828
829 switch (optname) {
830 case IPV6_CHECKSUM:
831 if (opt->checksum == 0)
832 val = -1;
833 else
834 val = opt->offset;
835
836 default:
837 return -ENOPROTOOPT;
838 }
839
840 len = min_t(unsigned int, sizeof(int), len);
841
842 if (put_user(len, optlen))
843 return -EFAULT;
844 if (copy_to_user(optval,&val,len))
845 return -EFAULT;
846 return 0;
847 }
848
849 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
850 {
851 switch(cmd) {
852 case SIOCOUTQ:
853 {
854 int amount = atomic_read(&sk->sk_wmem_alloc);
855 return put_user(amount, (int *)arg);
856 }
857 case SIOCINQ:
858 {
859 struct sk_buff *skb;
860 int amount = 0;
861
862 spin_lock_irq(&sk->sk_receive_queue.lock);
863 skb = skb_peek(&sk->sk_receive_queue);
864 if (skb != NULL)
865 amount = skb->tail - skb->h.raw;
866 spin_unlock_irq(&sk->sk_receive_queue.lock);
867 return put_user(amount, (int *)arg);
868 }
869
870 default:
871 return -ENOIOCTLCMD;
872 }
873 }
874
875 static void rawv6_close(struct sock *sk, long timeout)
876 {
877 if (inet_sk(sk)->num == IPPROTO_RAW)
878 ip6_ra_control(sk, -1, NULL);
879
880 inet_sock_release(sk);
881 }
882
883 static int rawv6_init_sk(struct sock *sk)
884 {
885 if (inet_sk(sk)->num == IPPROTO_ICMPV6) {
886 struct raw6_opt *opt = raw6_sk(sk);
887 opt->checksum = 1;
888 opt->offset = 2;
889 }
890 return(0);
891 }
892
893 struct proto rawv6_prot = {
894 .name = "RAW",
895 .close = rawv6_close,
896 .connect = udpv6_connect,
897 .disconnect = udp_disconnect,
898 .ioctl = rawv6_ioctl,
899 .init = rawv6_init_sk,
900 .destroy = inet6_destroy_sock,
901 .setsockopt = rawv6_setsockopt,
902 .getsockopt = rawv6_getsockopt,
903 .sendmsg = rawv6_sendmsg,
904 .recvmsg = rawv6_recvmsg,
905 .bind = rawv6_bind,
906 .backlog_rcv = rawv6_rcv_skb,
907 .hash = raw_v6_hash,
908 .unhash = raw_v6_unhash,
909 };
910
911 #ifdef CONFIG_PROC_FS
912 struct raw6_iter_state {
913 int bucket;
914 };
915
916 #define raw6_seq_private(seq) ((struct raw6_iter_state *)&seq->private)
917
918 static struct sock *raw6_get_first(struct seq_file *seq)
919 {
920 struct sock *sk;
921 struct hlist_node *node;
922 struct raw6_iter_state* state = raw6_seq_private(seq);
923
924 for (state->bucket = 0; state->bucket < RAWV6_HTABLE_SIZE; ++state->bucket)
925 sk_for_each(sk, node, &raw_v6_htable[state->bucket])
926 if (sk->sk_family == PF_INET6)
927 goto out;
928 sk = NULL;
929 out:
930 return sk;
931 }
932
933 static struct sock *raw6_get_next(struct seq_file *seq, struct sock *sk)
934 {
935 struct raw6_iter_state* state = raw6_seq_private(seq);
936
937 do {
938 sk = sk_next(sk);
939 try_again:
940 ;
941 } while (sk && sk->sk_family != PF_INET6);
942
943 if (!sk && ++state->bucket < RAWV6_HTABLE_SIZE) {
944 sk = sk_head(&raw_v6_htable[state->bucket]);
945 goto try_again;
946 }
947 return sk;
948 }
949
950 static struct sock *raw6_get_idx(struct seq_file *seq, loff_t pos)
951 {
952 struct sock *sk = raw6_get_first(seq);
953 if (sk)
954 while (pos && (sk = raw6_get_next(seq, sk)) != NULL)
955 --pos;
956 return pos ? NULL : sk;
957 }
958
959 static void *raw6_seq_start(struct seq_file *seq, loff_t *pos)
960 {
961 read_lock(&raw_v6_lock);
962 return *pos ? raw6_get_idx(seq, *pos) : (void *)1;
963 }
964
965 static void *raw6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
966 {
967 struct sock *sk;
968
969 if (v == (void *)1)
970 sk = raw6_get_first(seq);
971 else
972 sk = raw6_get_next(seq, v);
973 ++*pos;
974 return sk;
975 }
976
977 static void raw6_seq_stop(struct seq_file *seq, void *v)
978 {
979 read_unlock(&raw_v6_lock);
980 }
981
982 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
983 {
984 struct ipv6_pinfo *np = inet6_sk(sp);
985 struct in6_addr *dest, *src;
986 __u16 destp, srcp;
987
988 dest = &np->daddr;
989 src = &np->rcv_saddr;
990 destp = 0;
991 srcp = inet_sk(sp)->num;
992 seq_printf(seq,
993 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
994 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n",
995 i,
996 src->s6_addr32[0], src->s6_addr32[1],
997 src->s6_addr32[2], src->s6_addr32[3], srcp,
998 dest->s6_addr32[0], dest->s6_addr32[1],
999 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1000 sp->sk_state,
1001 atomic_read(&sp->sk_wmem_alloc),
1002 atomic_read(&sp->sk_rmem_alloc),
1003 0, 0L, 0,
1004 sock_i_uid(sp), 0,
1005 sock_i_ino(sp),
1006 atomic_read(&sp->sk_refcnt), sp);
1007 }
1008
1009 static int raw6_seq_show(struct seq_file *seq, void *v)
1010 {
1011 if (v == (void *)1)
1012 seq_printf(seq,
1013 " sl "
1014 "local_address "
1015 "remote_address "
1016 "st tx_queue rx_queue tr tm->when retrnsmt"
1017 " uid timeout inode\n");
1018 else
1019 raw6_sock_seq_show(seq, v, raw6_seq_private(seq)->bucket);
1020 return 0;
1021 }
1022
1023 static struct seq_operations raw6_seq_ops = {
1024 .start = raw6_seq_start,
1025 .next = raw6_seq_next,
1026 .stop = raw6_seq_stop,
1027 .show = raw6_seq_show,
1028 };
1029
1030 static int raw6_seq_open(struct inode *inode, struct file *file)
1031 {
1032 struct seq_file *seq;
1033 int rc = -ENOMEM;
1034 struct raw6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
1035 if (!s)
1036 goto out;
1037 rc = seq_open(file, &raw6_seq_ops);
1038 if (rc)
1039 goto out_kfree;
1040 seq = file->private_data;
1041 seq->private = s;
1042 memset(s, 0, sizeof(*s));
1043 out:
1044 return rc;
1045 out_kfree:
1046 kfree(s);
1047 goto out;
1048 }
1049
1050 static struct file_operations raw6_seq_fops = {
1051 .owner = THIS_MODULE,
1052 .open = raw6_seq_open,
1053 .read = seq_read,
1054 .llseek = seq_lseek,
1055 .release = seq_release_private,
1056 };
1057
1058 int __init raw6_proc_init(void)
1059 {
1060 struct proc_dir_entry *p = create_proc_entry("raw6", S_IRUGO, proc_net);
1061
1062 if (!p)
1063 return -ENOMEM;
1064 p->proc_fops = &raw6_seq_fops;
1065
1066 return 0;
1067 }
1068
1069 void raw6_proc_exit(void)
1070 {
1071 proc_net_remove("raw6");
1072 }
1073 #endif /* CONFIG_PROC_FS */
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