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IPv6: Complete IPV6_DONTFRAG support
[deliverable/linux.git] / net / ipv6 / raw.c
1 /*
2 * RAW sockets for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Adapted from linux/net/ipv4/raw.c
9 *
10 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance)
13 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 */
20
21 #include <linux/errno.h>
22 #include <linux/types.h>
23 #include <linux/socket.h>
24 #include <linux/slab.h>
25 #include <linux/sockios.h>
26 #include <linux/net.h>
27 #include <linux/in6.h>
28 #include <linux/netdevice.h>
29 #include <linux/if_arp.h>
30 #include <linux/icmpv6.h>
31 #include <linux/netfilter.h>
32 #include <linux/netfilter_ipv6.h>
33 #include <linux/skbuff.h>
34 #include <asm/uaccess.h>
35 #include <asm/ioctls.h>
36
37 #include <net/net_namespace.h>
38 #include <net/ip.h>
39 #include <net/sock.h>
40 #include <net/snmp.h>
41
42 #include <net/ipv6.h>
43 #include <net/ndisc.h>
44 #include <net/protocol.h>
45 #include <net/ip6_route.h>
46 #include <net/ip6_checksum.h>
47 #include <net/addrconf.h>
48 #include <net/transp_v6.h>
49 #include <net/udp.h>
50 #include <net/inet_common.h>
51 #include <net/tcp_states.h>
52 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
53 #include <net/mip6.h>
54 #endif
55 #include <linux/mroute6.h>
56
57 #include <net/raw.h>
58 #include <net/rawv6.h>
59 #include <net/xfrm.h>
60
61 #include <linux/proc_fs.h>
62 #include <linux/seq_file.h>
63
64 static struct raw_hashinfo raw_v6_hashinfo = {
65 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
66 };
67
68 static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
69 unsigned short num, struct in6_addr *loc_addr,
70 struct in6_addr *rmt_addr, int dif)
71 {
72 struct hlist_node *node;
73 int is_multicast = ipv6_addr_is_multicast(loc_addr);
74
75 sk_for_each_from(sk, node)
76 if (inet_sk(sk)->inet_num == num) {
77 struct ipv6_pinfo *np = inet6_sk(sk);
78
79 if (!net_eq(sock_net(sk), net))
80 continue;
81
82 if (!ipv6_addr_any(&np->daddr) &&
83 !ipv6_addr_equal(&np->daddr, rmt_addr))
84 continue;
85
86 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
87 continue;
88
89 if (!ipv6_addr_any(&np->rcv_saddr)) {
90 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
91 goto found;
92 if (is_multicast &&
93 inet6_mc_check(sk, loc_addr, rmt_addr))
94 goto found;
95 continue;
96 }
97 goto found;
98 }
99 sk = NULL;
100 found:
101 return sk;
102 }
103
104 /*
105 * 0 - deliver
106 * 1 - block
107 */
108 static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb)
109 {
110 struct icmp6hdr *icmph;
111 struct raw6_sock *rp = raw6_sk(sk);
112
113 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) {
114 __u32 *data = &rp->filter.data[0];
115 int bit_nr;
116
117 icmph = (struct icmp6hdr *) skb->data;
118 bit_nr = icmph->icmp6_type;
119
120 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0;
121 }
122 return 0;
123 }
124
125 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
126 static int (*mh_filter)(struct sock *sock, struct sk_buff *skb);
127
128 int rawv6_mh_filter_register(int (*filter)(struct sock *sock,
129 struct sk_buff *skb))
130 {
131 rcu_assign_pointer(mh_filter, filter);
132 return 0;
133 }
134 EXPORT_SYMBOL(rawv6_mh_filter_register);
135
136 int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock,
137 struct sk_buff *skb))
138 {
139 rcu_assign_pointer(mh_filter, NULL);
140 synchronize_rcu();
141 return 0;
142 }
143 EXPORT_SYMBOL(rawv6_mh_filter_unregister);
144
145 #endif
146
147 /*
148 * demultiplex raw sockets.
149 * (should consider queueing the skb in the sock receive_queue
150 * without calling rawv6.c)
151 *
152 * Caller owns SKB so we must make clones.
153 */
154 static int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
155 {
156 struct in6_addr *saddr;
157 struct in6_addr *daddr;
158 struct sock *sk;
159 int delivered = 0;
160 __u8 hash;
161 struct net *net;
162
163 saddr = &ipv6_hdr(skb)->saddr;
164 daddr = saddr + 1;
165
166 hash = nexthdr & (MAX_INET_PROTOS - 1);
167
168 read_lock(&raw_v6_hashinfo.lock);
169 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
170
171 if (sk == NULL)
172 goto out;
173
174 net = dev_net(skb->dev);
175 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
176
177 while (sk) {
178 int filtered;
179
180 delivered = 1;
181 switch (nexthdr) {
182 case IPPROTO_ICMPV6:
183 filtered = icmpv6_filter(sk, skb);
184 break;
185
186 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
187 case IPPROTO_MH:
188 {
189 /* XXX: To validate MH only once for each packet,
190 * this is placed here. It should be after checking
191 * xfrm policy, however it doesn't. The checking xfrm
192 * policy is placed in rawv6_rcv() because it is
193 * required for each socket.
194 */
195 int (*filter)(struct sock *sock, struct sk_buff *skb);
196
197 filter = rcu_dereference(mh_filter);
198 filtered = filter ? filter(sk, skb) : 0;
199 break;
200 }
201 #endif
202 default:
203 filtered = 0;
204 break;
205 }
206
207 if (filtered < 0)
208 break;
209 if (filtered == 0) {
210 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
211
212 /* Not releasing hash table! */
213 if (clone) {
214 nf_reset(clone);
215 rawv6_rcv(sk, clone);
216 }
217 }
218 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
219 IP6CB(skb)->iif);
220 }
221 out:
222 read_unlock(&raw_v6_hashinfo.lock);
223 return delivered;
224 }
225
226 int raw6_local_deliver(struct sk_buff *skb, int nexthdr)
227 {
228 struct sock *raw_sk;
229
230 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (MAX_INET_PROTOS - 1)]);
231 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
232 raw_sk = NULL;
233
234 return raw_sk != NULL;
235 }
236
237 /* This cleans up af_inet6 a bit. -DaveM */
238 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
239 {
240 struct inet_sock *inet = inet_sk(sk);
241 struct ipv6_pinfo *np = inet6_sk(sk);
242 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
243 __be32 v4addr = 0;
244 int addr_type;
245 int err;
246
247 if (addr_len < SIN6_LEN_RFC2133)
248 return -EINVAL;
249 addr_type = ipv6_addr_type(&addr->sin6_addr);
250
251 /* Raw sockets are IPv6 only */
252 if (addr_type == IPV6_ADDR_MAPPED)
253 return -EADDRNOTAVAIL;
254
255 lock_sock(sk);
256
257 err = -EINVAL;
258 if (sk->sk_state != TCP_CLOSE)
259 goto out;
260
261 rcu_read_lock();
262 /* Check if the address belongs to the host. */
263 if (addr_type != IPV6_ADDR_ANY) {
264 struct net_device *dev = NULL;
265
266 if (addr_type & IPV6_ADDR_LINKLOCAL) {
267 if (addr_len >= sizeof(struct sockaddr_in6) &&
268 addr->sin6_scope_id) {
269 /* Override any existing binding, if another
270 * one is supplied by user.
271 */
272 sk->sk_bound_dev_if = addr->sin6_scope_id;
273 }
274
275 /* Binding to link-local address requires an interface */
276 if (!sk->sk_bound_dev_if)
277 goto out_unlock;
278
279 err = -ENODEV;
280 dev = dev_get_by_index_rcu(sock_net(sk),
281 sk->sk_bound_dev_if);
282 if (!dev)
283 goto out_unlock;
284 }
285
286 /* ipv4 addr of the socket is invalid. Only the
287 * unspecified and mapped address have a v4 equivalent.
288 */
289 v4addr = LOOPBACK4_IPV6;
290 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
291 err = -EADDRNOTAVAIL;
292 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
293 dev, 0)) {
294 goto out_unlock;
295 }
296 }
297 }
298
299 inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
300 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
301 if (!(addr_type & IPV6_ADDR_MULTICAST))
302 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
303 err = 0;
304 out_unlock:
305 rcu_read_unlock();
306 out:
307 release_sock(sk);
308 return err;
309 }
310
311 static void rawv6_err(struct sock *sk, struct sk_buff *skb,
312 struct inet6_skb_parm *opt,
313 u8 type, u8 code, int offset, __be32 info)
314 {
315 struct inet_sock *inet = inet_sk(sk);
316 struct ipv6_pinfo *np = inet6_sk(sk);
317 int err;
318 int harderr;
319
320 /* Report error on raw socket, if:
321 1. User requested recverr.
322 2. Socket is connected (otherwise the error indication
323 is useless without recverr and error is hard.
324 */
325 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
326 return;
327
328 harderr = icmpv6_err_convert(type, code, &err);
329 if (type == ICMPV6_PKT_TOOBIG)
330 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
331
332 if (np->recverr) {
333 u8 *payload = skb->data;
334 if (!inet->hdrincl)
335 payload += offset;
336 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
337 }
338
339 if (np->recverr || harderr) {
340 sk->sk_err = err;
341 sk->sk_error_report(sk);
342 }
343 }
344
345 void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
346 u8 type, u8 code, int inner_offset, __be32 info)
347 {
348 struct sock *sk;
349 int hash;
350 struct in6_addr *saddr, *daddr;
351 struct net *net;
352
353 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
354
355 read_lock(&raw_v6_hashinfo.lock);
356 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
357 if (sk != NULL) {
358 /* Note: ipv6_hdr(skb) != skb->data */
359 struct ipv6hdr *ip6h = (struct ipv6hdr *)skb->data;
360 saddr = &ip6h->saddr;
361 daddr = &ip6h->daddr;
362 net = dev_net(skb->dev);
363
364 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
365 IP6CB(skb)->iif))) {
366 rawv6_err(sk, skb, NULL, type, code,
367 inner_offset, info);
368 sk = sk_next(sk);
369 }
370 }
371 read_unlock(&raw_v6_hashinfo.lock);
372 }
373
374 static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
375 {
376 if ((raw6_sk(sk)->checksum || sk->sk_filter) &&
377 skb_checksum_complete(skb)) {
378 atomic_inc(&sk->sk_drops);
379 kfree_skb(skb);
380 return NET_RX_DROP;
381 }
382
383 /* Charge it to the socket. */
384 if (sock_queue_rcv_skb(sk, skb) < 0) {
385 kfree_skb(skb);
386 return NET_RX_DROP;
387 }
388
389 return 0;
390 }
391
392 /*
393 * This is next to useless...
394 * if we demultiplex in network layer we don't need the extra call
395 * just to queue the skb...
396 * maybe we could have the network decide upon a hint if it
397 * should call raw_rcv for demultiplexing
398 */
399 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
400 {
401 struct inet_sock *inet = inet_sk(sk);
402 struct raw6_sock *rp = raw6_sk(sk);
403
404 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
405 atomic_inc(&sk->sk_drops);
406 kfree_skb(skb);
407 return NET_RX_DROP;
408 }
409
410 if (!rp->checksum)
411 skb->ip_summed = CHECKSUM_UNNECESSARY;
412
413 if (skb->ip_summed == CHECKSUM_COMPLETE) {
414 skb_postpull_rcsum(skb, skb_network_header(skb),
415 skb_network_header_len(skb));
416 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
417 &ipv6_hdr(skb)->daddr,
418 skb->len, inet->inet_num, skb->csum))
419 skb->ip_summed = CHECKSUM_UNNECESSARY;
420 }
421 if (!skb_csum_unnecessary(skb))
422 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
423 &ipv6_hdr(skb)->daddr,
424 skb->len,
425 inet->inet_num, 0));
426
427 if (inet->hdrincl) {
428 if (skb_checksum_complete(skb)) {
429 atomic_inc(&sk->sk_drops);
430 kfree_skb(skb);
431 return NET_RX_DROP;
432 }
433 }
434
435 rawv6_rcv_skb(sk, skb);
436 return 0;
437 }
438
439
440 /*
441 * This should be easy, if there is something there
442 * we return it, otherwise we block.
443 */
444
445 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
446 struct msghdr *msg, size_t len,
447 int noblock, int flags, int *addr_len)
448 {
449 struct ipv6_pinfo *np = inet6_sk(sk);
450 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
451 struct sk_buff *skb;
452 size_t copied;
453 int err;
454
455 if (flags & MSG_OOB)
456 return -EOPNOTSUPP;
457
458 if (addr_len)
459 *addr_len=sizeof(*sin6);
460
461 if (flags & MSG_ERRQUEUE)
462 return ipv6_recv_error(sk, msg, len);
463
464 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
465 return ipv6_recv_rxpmtu(sk, msg, len);
466
467 skb = skb_recv_datagram(sk, flags, noblock, &err);
468 if (!skb)
469 goto out;
470
471 copied = skb->len;
472 if (copied > len) {
473 copied = len;
474 msg->msg_flags |= MSG_TRUNC;
475 }
476
477 if (skb_csum_unnecessary(skb)) {
478 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
479 } else if (msg->msg_flags&MSG_TRUNC) {
480 if (__skb_checksum_complete(skb))
481 goto csum_copy_err;
482 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
483 } else {
484 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
485 if (err == -EINVAL)
486 goto csum_copy_err;
487 }
488 if (err)
489 goto out_free;
490
491 /* Copy the address. */
492 if (sin6) {
493 sin6->sin6_family = AF_INET6;
494 sin6->sin6_port = 0;
495 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
496 sin6->sin6_flowinfo = 0;
497 sin6->sin6_scope_id = 0;
498 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
499 sin6->sin6_scope_id = IP6CB(skb)->iif;
500 }
501
502 sock_recv_ts_and_drops(msg, sk, skb);
503
504 if (np->rxopt.all)
505 datagram_recv_ctl(sk, msg, skb);
506
507 err = copied;
508 if (flags & MSG_TRUNC)
509 err = skb->len;
510
511 out_free:
512 skb_free_datagram(sk, skb);
513 out:
514 return err;
515
516 csum_copy_err:
517 skb_kill_datagram(sk, skb, flags);
518
519 /* Error for blocking case is chosen to masquerade
520 as some normal condition.
521 */
522 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
523 goto out;
524 }
525
526 static int rawv6_push_pending_frames(struct sock *sk, struct flowi *fl,
527 struct raw6_sock *rp)
528 {
529 struct sk_buff *skb;
530 int err = 0;
531 int offset;
532 int len;
533 int total_len;
534 __wsum tmp_csum;
535 __sum16 csum;
536
537 if (!rp->checksum)
538 goto send;
539
540 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
541 goto out;
542
543 offset = rp->offset;
544 total_len = inet_sk(sk)->cork.length - (skb_network_header(skb) -
545 skb->data);
546 if (offset >= total_len - 1) {
547 err = -EINVAL;
548 ip6_flush_pending_frames(sk);
549 goto out;
550 }
551
552 /* should be check HW csum miyazawa */
553 if (skb_queue_len(&sk->sk_write_queue) == 1) {
554 /*
555 * Only one fragment on the socket.
556 */
557 tmp_csum = skb->csum;
558 } else {
559 struct sk_buff *csum_skb = NULL;
560 tmp_csum = 0;
561
562 skb_queue_walk(&sk->sk_write_queue, skb) {
563 tmp_csum = csum_add(tmp_csum, skb->csum);
564
565 if (csum_skb)
566 continue;
567
568 len = skb->len - skb_transport_offset(skb);
569 if (offset >= len) {
570 offset -= len;
571 continue;
572 }
573
574 csum_skb = skb;
575 }
576
577 skb = csum_skb;
578 }
579
580 offset += skb_transport_offset(skb);
581 if (skb_copy_bits(skb, offset, &csum, 2))
582 BUG();
583
584 /* in case cksum was not initialized */
585 if (unlikely(csum))
586 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
587
588 csum = csum_ipv6_magic(&fl->fl6_src,
589 &fl->fl6_dst,
590 total_len, fl->proto, tmp_csum);
591
592 if (csum == 0 && fl->proto == IPPROTO_UDP)
593 csum = CSUM_MANGLED_0;
594
595 if (skb_store_bits(skb, offset, &csum, 2))
596 BUG();
597
598 send:
599 err = ip6_push_pending_frames(sk);
600 out:
601 return err;
602 }
603
604 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
605 struct flowi *fl, struct rt6_info *rt,
606 unsigned int flags)
607 {
608 struct ipv6_pinfo *np = inet6_sk(sk);
609 struct ipv6hdr *iph;
610 struct sk_buff *skb;
611 int err;
612
613 if (length > rt->u.dst.dev->mtu) {
614 ipv6_local_error(sk, EMSGSIZE, fl, rt->u.dst.dev->mtu);
615 return -EMSGSIZE;
616 }
617 if (flags&MSG_PROBE)
618 goto out;
619
620 skb = sock_alloc_send_skb(sk,
621 length + LL_ALLOCATED_SPACE(rt->u.dst.dev) + 15,
622 flags & MSG_DONTWAIT, &err);
623 if (skb == NULL)
624 goto error;
625 skb_reserve(skb, LL_RESERVED_SPACE(rt->u.dst.dev));
626
627 skb->priority = sk->sk_priority;
628 skb->mark = sk->sk_mark;
629 skb_dst_set(skb, dst_clone(&rt->u.dst));
630
631 skb_put(skb, length);
632 skb_reset_network_header(skb);
633 iph = ipv6_hdr(skb);
634
635 skb->ip_summed = CHECKSUM_NONE;
636
637 skb->transport_header = skb->network_header;
638 err = memcpy_fromiovecend((void *)iph, from, 0, length);
639 if (err)
640 goto error_fault;
641
642 IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
643 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
644 dst_output);
645 if (err > 0)
646 err = net_xmit_errno(err);
647 if (err)
648 goto error;
649 out:
650 return 0;
651
652 error_fault:
653 err = -EFAULT;
654 kfree_skb(skb);
655 error:
656 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
657 if (err == -ENOBUFS && !np->recverr)
658 err = 0;
659 return err;
660 }
661
662 static int rawv6_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
663 {
664 struct iovec *iov;
665 u8 __user *type = NULL;
666 u8 __user *code = NULL;
667 u8 len = 0;
668 int probed = 0;
669 int i;
670
671 if (!msg->msg_iov)
672 return 0;
673
674 for (i = 0; i < msg->msg_iovlen; i++) {
675 iov = &msg->msg_iov[i];
676 if (!iov)
677 continue;
678
679 switch (fl->proto) {
680 case IPPROTO_ICMPV6:
681 /* check if one-byte field is readable or not. */
682 if (iov->iov_base && iov->iov_len < 1)
683 break;
684
685 if (!type) {
686 type = iov->iov_base;
687 /* check if code field is readable or not. */
688 if (iov->iov_len > 1)
689 code = type + 1;
690 } else if (!code)
691 code = iov->iov_base;
692
693 if (type && code) {
694 if (get_user(fl->fl_icmp_type, type) ||
695 get_user(fl->fl_icmp_code, code))
696 return -EFAULT;
697 probed = 1;
698 }
699 break;
700 case IPPROTO_MH:
701 if (iov->iov_base && iov->iov_len < 1)
702 break;
703 /* check if type field is readable or not. */
704 if (iov->iov_len > 2 - len) {
705 u8 __user *p = iov->iov_base;
706 if (get_user(fl->fl_mh_type, &p[2 - len]))
707 return -EFAULT;
708 probed = 1;
709 } else
710 len += iov->iov_len;
711
712 break;
713 default:
714 probed = 1;
715 break;
716 }
717 if (probed)
718 break;
719 }
720 return 0;
721 }
722
723 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
724 struct msghdr *msg, size_t len)
725 {
726 struct ipv6_txoptions opt_space;
727 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
728 struct in6_addr *daddr, *final_p = NULL, final;
729 struct inet_sock *inet = inet_sk(sk);
730 struct ipv6_pinfo *np = inet6_sk(sk);
731 struct raw6_sock *rp = raw6_sk(sk);
732 struct ipv6_txoptions *opt = NULL;
733 struct ip6_flowlabel *flowlabel = NULL;
734 struct dst_entry *dst = NULL;
735 struct flowi fl;
736 int addr_len = msg->msg_namelen;
737 int hlimit = -1;
738 int tclass = -1;
739 int dontfrag = -1;
740 u16 proto;
741 int err;
742
743 /* Rough check on arithmetic overflow,
744 better check is made in ip6_append_data().
745 */
746 if (len > INT_MAX)
747 return -EMSGSIZE;
748
749 /* Mirror BSD error message compatibility */
750 if (msg->msg_flags & MSG_OOB)
751 return -EOPNOTSUPP;
752
753 /*
754 * Get and verify the address.
755 */
756 memset(&fl, 0, sizeof(fl));
757
758 fl.mark = sk->sk_mark;
759
760 if (sin6) {
761 if (addr_len < SIN6_LEN_RFC2133)
762 return -EINVAL;
763
764 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
765 return(-EAFNOSUPPORT);
766
767 /* port is the proto value [0..255] carried in nexthdr */
768 proto = ntohs(sin6->sin6_port);
769
770 if (!proto)
771 proto = inet->inet_num;
772 else if (proto != inet->inet_num)
773 return(-EINVAL);
774
775 if (proto > 255)
776 return(-EINVAL);
777
778 daddr = &sin6->sin6_addr;
779 if (np->sndflow) {
780 fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
781 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
782 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
783 if (flowlabel == NULL)
784 return -EINVAL;
785 daddr = &flowlabel->dst;
786 }
787 }
788
789 /*
790 * Otherwise it will be difficult to maintain
791 * sk->sk_dst_cache.
792 */
793 if (sk->sk_state == TCP_ESTABLISHED &&
794 ipv6_addr_equal(daddr, &np->daddr))
795 daddr = &np->daddr;
796
797 if (addr_len >= sizeof(struct sockaddr_in6) &&
798 sin6->sin6_scope_id &&
799 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
800 fl.oif = sin6->sin6_scope_id;
801 } else {
802 if (sk->sk_state != TCP_ESTABLISHED)
803 return -EDESTADDRREQ;
804
805 proto = inet->inet_num;
806 daddr = &np->daddr;
807 fl.fl6_flowlabel = np->flow_label;
808 }
809
810 if (fl.oif == 0)
811 fl.oif = sk->sk_bound_dev_if;
812
813 if (msg->msg_controllen) {
814 opt = &opt_space;
815 memset(opt, 0, sizeof(struct ipv6_txoptions));
816 opt->tot_len = sizeof(struct ipv6_txoptions);
817
818 err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit,
819 &tclass, &dontfrag);
820 if (err < 0) {
821 fl6_sock_release(flowlabel);
822 return err;
823 }
824 if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
825 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
826 if (flowlabel == NULL)
827 return -EINVAL;
828 }
829 if (!(opt->opt_nflen|opt->opt_flen))
830 opt = NULL;
831 }
832 if (opt == NULL)
833 opt = np->opt;
834 if (flowlabel)
835 opt = fl6_merge_options(&opt_space, flowlabel, opt);
836 opt = ipv6_fixup_options(&opt_space, opt);
837
838 fl.proto = proto;
839 err = rawv6_probe_proto_opt(&fl, msg);
840 if (err)
841 goto out;
842
843 if (!ipv6_addr_any(daddr))
844 ipv6_addr_copy(&fl.fl6_dst, daddr);
845 else
846 fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
847 if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr))
848 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
849
850 /* merge ip6_build_xmit from ip6_output */
851 if (opt && opt->srcrt) {
852 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
853 ipv6_addr_copy(&final, &fl.fl6_dst);
854 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
855 final_p = &final;
856 }
857
858 if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
859 fl.oif = np->mcast_oif;
860 security_sk_classify_flow(sk, &fl);
861
862 err = ip6_dst_lookup(sk, &dst, &fl);
863 if (err)
864 goto out;
865 if (final_p)
866 ipv6_addr_copy(&fl.fl6_dst, final_p);
867
868 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
869 if (err < 0) {
870 if (err == -EREMOTE)
871 err = ip6_dst_blackhole(sk, &dst, &fl);
872 if (err < 0)
873 goto out;
874 }
875
876 if (hlimit < 0) {
877 if (ipv6_addr_is_multicast(&fl.fl6_dst))
878 hlimit = np->mcast_hops;
879 else
880 hlimit = np->hop_limit;
881 if (hlimit < 0)
882 hlimit = ip6_dst_hoplimit(dst);
883 }
884
885 if (tclass < 0)
886 tclass = np->tclass;
887
888 if (dontfrag < 0)
889 dontfrag = np->dontfrag;
890
891 if (msg->msg_flags&MSG_CONFIRM)
892 goto do_confirm;
893
894 back_from_confirm:
895 if (inet->hdrincl) {
896 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl, (struct rt6_info*)dst, msg->msg_flags);
897 } else {
898 lock_sock(sk);
899 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
900 len, 0, hlimit, tclass, opt, &fl, (struct rt6_info*)dst,
901 msg->msg_flags, dontfrag);
902
903 if (err)
904 ip6_flush_pending_frames(sk);
905 else if (!(msg->msg_flags & MSG_MORE))
906 err = rawv6_push_pending_frames(sk, &fl, rp);
907 release_sock(sk);
908 }
909 done:
910 dst_release(dst);
911 out:
912 fl6_sock_release(flowlabel);
913 return err<0?err:len;
914 do_confirm:
915 dst_confirm(dst);
916 if (!(msg->msg_flags & MSG_PROBE) || len)
917 goto back_from_confirm;
918 err = 0;
919 goto done;
920 }
921
922 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
923 char __user *optval, int optlen)
924 {
925 switch (optname) {
926 case ICMPV6_FILTER:
927 if (optlen > sizeof(struct icmp6_filter))
928 optlen = sizeof(struct icmp6_filter);
929 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
930 return -EFAULT;
931 return 0;
932 default:
933 return -ENOPROTOOPT;
934 }
935
936 return 0;
937 }
938
939 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
940 char __user *optval, int __user *optlen)
941 {
942 int len;
943
944 switch (optname) {
945 case ICMPV6_FILTER:
946 if (get_user(len, optlen))
947 return -EFAULT;
948 if (len < 0)
949 return -EINVAL;
950 if (len > sizeof(struct icmp6_filter))
951 len = sizeof(struct icmp6_filter);
952 if (put_user(len, optlen))
953 return -EFAULT;
954 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
955 return -EFAULT;
956 return 0;
957 default:
958 return -ENOPROTOOPT;
959 }
960
961 return 0;
962 }
963
964
965 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
966 char __user *optval, unsigned int optlen)
967 {
968 struct raw6_sock *rp = raw6_sk(sk);
969 int val;
970
971 if (get_user(val, (int __user *)optval))
972 return -EFAULT;
973
974 switch (optname) {
975 case IPV6_CHECKSUM:
976 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
977 level == IPPROTO_IPV6) {
978 /*
979 * RFC3542 tells that IPV6_CHECKSUM socket
980 * option in the IPPROTO_IPV6 level is not
981 * allowed on ICMPv6 sockets.
982 * If you want to set it, use IPPROTO_RAW
983 * level IPV6_CHECKSUM socket option
984 * (Linux extension).
985 */
986 return -EINVAL;
987 }
988
989 /* You may get strange result with a positive odd offset;
990 RFC2292bis agrees with me. */
991 if (val > 0 && (val&1))
992 return(-EINVAL);
993 if (val < 0) {
994 rp->checksum = 0;
995 } else {
996 rp->checksum = 1;
997 rp->offset = val;
998 }
999
1000 return 0;
1001 break;
1002
1003 default:
1004 return(-ENOPROTOOPT);
1005 }
1006 }
1007
1008 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1009 char __user *optval, unsigned int optlen)
1010 {
1011 switch(level) {
1012 case SOL_RAW:
1013 break;
1014
1015 case SOL_ICMPV6:
1016 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1017 return -EOPNOTSUPP;
1018 return rawv6_seticmpfilter(sk, level, optname, optval,
1019 optlen);
1020 case SOL_IPV6:
1021 if (optname == IPV6_CHECKSUM)
1022 break;
1023 default:
1024 return ipv6_setsockopt(sk, level, optname, optval,
1025 optlen);
1026 }
1027
1028 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1029 }
1030
1031 #ifdef CONFIG_COMPAT
1032 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1033 char __user *optval, unsigned int optlen)
1034 {
1035 switch (level) {
1036 case SOL_RAW:
1037 break;
1038 case SOL_ICMPV6:
1039 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1040 return -EOPNOTSUPP;
1041 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1042 case SOL_IPV6:
1043 if (optname == IPV6_CHECKSUM)
1044 break;
1045 default:
1046 return compat_ipv6_setsockopt(sk, level, optname,
1047 optval, optlen);
1048 }
1049 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1050 }
1051 #endif
1052
1053 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1054 char __user *optval, int __user *optlen)
1055 {
1056 struct raw6_sock *rp = raw6_sk(sk);
1057 int val, len;
1058
1059 if (get_user(len,optlen))
1060 return -EFAULT;
1061
1062 switch (optname) {
1063 case IPV6_CHECKSUM:
1064 /*
1065 * We allow getsockopt() for IPPROTO_IPV6-level
1066 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1067 * since RFC3542 is silent about it.
1068 */
1069 if (rp->checksum == 0)
1070 val = -1;
1071 else
1072 val = rp->offset;
1073 break;
1074
1075 default:
1076 return -ENOPROTOOPT;
1077 }
1078
1079 len = min_t(unsigned int, sizeof(int), len);
1080
1081 if (put_user(len, optlen))
1082 return -EFAULT;
1083 if (copy_to_user(optval,&val,len))
1084 return -EFAULT;
1085 return 0;
1086 }
1087
1088 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1089 char __user *optval, int __user *optlen)
1090 {
1091 switch(level) {
1092 case SOL_RAW:
1093 break;
1094
1095 case SOL_ICMPV6:
1096 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1097 return -EOPNOTSUPP;
1098 return rawv6_geticmpfilter(sk, level, optname, optval,
1099 optlen);
1100 case SOL_IPV6:
1101 if (optname == IPV6_CHECKSUM)
1102 break;
1103 default:
1104 return ipv6_getsockopt(sk, level, optname, optval,
1105 optlen);
1106 }
1107
1108 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1109 }
1110
1111 #ifdef CONFIG_COMPAT
1112 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1113 char __user *optval, int __user *optlen)
1114 {
1115 switch (level) {
1116 case SOL_RAW:
1117 break;
1118 case SOL_ICMPV6:
1119 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1120 return -EOPNOTSUPP;
1121 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1122 case SOL_IPV6:
1123 if (optname == IPV6_CHECKSUM)
1124 break;
1125 default:
1126 return compat_ipv6_getsockopt(sk, level, optname,
1127 optval, optlen);
1128 }
1129 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1130 }
1131 #endif
1132
1133 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1134 {
1135 switch(cmd) {
1136 case SIOCOUTQ:
1137 {
1138 int amount = sk_wmem_alloc_get(sk);
1139
1140 return put_user(amount, (int __user *)arg);
1141 }
1142 case SIOCINQ:
1143 {
1144 struct sk_buff *skb;
1145 int amount = 0;
1146
1147 spin_lock_bh(&sk->sk_receive_queue.lock);
1148 skb = skb_peek(&sk->sk_receive_queue);
1149 if (skb != NULL)
1150 amount = skb->tail - skb->transport_header;
1151 spin_unlock_bh(&sk->sk_receive_queue.lock);
1152 return put_user(amount, (int __user *)arg);
1153 }
1154
1155 default:
1156 #ifdef CONFIG_IPV6_MROUTE
1157 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1158 #else
1159 return -ENOIOCTLCMD;
1160 #endif
1161 }
1162 }
1163
1164 static void rawv6_close(struct sock *sk, long timeout)
1165 {
1166 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1167 ip6_ra_control(sk, -1);
1168 ip6mr_sk_done(sk);
1169 sk_common_release(sk);
1170 }
1171
1172 static void raw6_destroy(struct sock *sk)
1173 {
1174 lock_sock(sk);
1175 ip6_flush_pending_frames(sk);
1176 release_sock(sk);
1177
1178 inet6_destroy_sock(sk);
1179 }
1180
1181 static int rawv6_init_sk(struct sock *sk)
1182 {
1183 struct raw6_sock *rp = raw6_sk(sk);
1184
1185 switch (inet_sk(sk)->inet_num) {
1186 case IPPROTO_ICMPV6:
1187 rp->checksum = 1;
1188 rp->offset = 2;
1189 break;
1190 case IPPROTO_MH:
1191 rp->checksum = 1;
1192 rp->offset = 4;
1193 break;
1194 default:
1195 break;
1196 }
1197 return(0);
1198 }
1199
1200 struct proto rawv6_prot = {
1201 .name = "RAWv6",
1202 .owner = THIS_MODULE,
1203 .close = rawv6_close,
1204 .destroy = raw6_destroy,
1205 .connect = ip6_datagram_connect,
1206 .disconnect = udp_disconnect,
1207 .ioctl = rawv6_ioctl,
1208 .init = rawv6_init_sk,
1209 .setsockopt = rawv6_setsockopt,
1210 .getsockopt = rawv6_getsockopt,
1211 .sendmsg = rawv6_sendmsg,
1212 .recvmsg = rawv6_recvmsg,
1213 .bind = rawv6_bind,
1214 .backlog_rcv = rawv6_rcv_skb,
1215 .hash = raw_hash_sk,
1216 .unhash = raw_unhash_sk,
1217 .obj_size = sizeof(struct raw6_sock),
1218 .h.raw_hash = &raw_v6_hashinfo,
1219 #ifdef CONFIG_COMPAT
1220 .compat_setsockopt = compat_rawv6_setsockopt,
1221 .compat_getsockopt = compat_rawv6_getsockopt,
1222 #endif
1223 };
1224
1225 #ifdef CONFIG_PROC_FS
1226 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1227 {
1228 struct ipv6_pinfo *np = inet6_sk(sp);
1229 struct in6_addr *dest, *src;
1230 __u16 destp, srcp;
1231
1232 dest = &np->daddr;
1233 src = &np->rcv_saddr;
1234 destp = 0;
1235 srcp = inet_sk(sp)->inet_num;
1236 seq_printf(seq,
1237 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1238 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n",
1239 i,
1240 src->s6_addr32[0], src->s6_addr32[1],
1241 src->s6_addr32[2], src->s6_addr32[3], srcp,
1242 dest->s6_addr32[0], dest->s6_addr32[1],
1243 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1244 sp->sk_state,
1245 sk_wmem_alloc_get(sp),
1246 sk_rmem_alloc_get(sp),
1247 0, 0L, 0,
1248 sock_i_uid(sp), 0,
1249 sock_i_ino(sp),
1250 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1251 }
1252
1253 static int raw6_seq_show(struct seq_file *seq, void *v)
1254 {
1255 if (v == SEQ_START_TOKEN)
1256 seq_printf(seq,
1257 " sl "
1258 "local_address "
1259 "remote_address "
1260 "st tx_queue rx_queue tr tm->when retrnsmt"
1261 " uid timeout inode ref pointer drops\n");
1262 else
1263 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1264 return 0;
1265 }
1266
1267 static const struct seq_operations raw6_seq_ops = {
1268 .start = raw_seq_start,
1269 .next = raw_seq_next,
1270 .stop = raw_seq_stop,
1271 .show = raw6_seq_show,
1272 };
1273
1274 static int raw6_seq_open(struct inode *inode, struct file *file)
1275 {
1276 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1277 }
1278
1279 static const struct file_operations raw6_seq_fops = {
1280 .owner = THIS_MODULE,
1281 .open = raw6_seq_open,
1282 .read = seq_read,
1283 .llseek = seq_lseek,
1284 .release = seq_release_net,
1285 };
1286
1287 static int __net_init raw6_init_net(struct net *net)
1288 {
1289 if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops))
1290 return -ENOMEM;
1291
1292 return 0;
1293 }
1294
1295 static void __net_exit raw6_exit_net(struct net *net)
1296 {
1297 proc_net_remove(net, "raw6");
1298 }
1299
1300 static struct pernet_operations raw6_net_ops = {
1301 .init = raw6_init_net,
1302 .exit = raw6_exit_net,
1303 };
1304
1305 int __init raw6_proc_init(void)
1306 {
1307 return register_pernet_subsys(&raw6_net_ops);
1308 }
1309
1310 void raw6_proc_exit(void)
1311 {
1312 unregister_pernet_subsys(&raw6_net_ops);
1313 }
1314 #endif /* CONFIG_PROC_FS */
1315
1316 /* Same as inet6_dgram_ops, sans udp_poll. */
1317 static const struct proto_ops inet6_sockraw_ops = {
1318 .family = PF_INET6,
1319 .owner = THIS_MODULE,
1320 .release = inet6_release,
1321 .bind = inet6_bind,
1322 .connect = inet_dgram_connect, /* ok */
1323 .socketpair = sock_no_socketpair, /* a do nothing */
1324 .accept = sock_no_accept, /* a do nothing */
1325 .getname = inet6_getname,
1326 .poll = datagram_poll, /* ok */
1327 .ioctl = inet6_ioctl, /* must change */
1328 .listen = sock_no_listen, /* ok */
1329 .shutdown = inet_shutdown, /* ok */
1330 .setsockopt = sock_common_setsockopt, /* ok */
1331 .getsockopt = sock_common_getsockopt, /* ok */
1332 .sendmsg = inet_sendmsg, /* ok */
1333 .recvmsg = sock_common_recvmsg, /* ok */
1334 .mmap = sock_no_mmap,
1335 .sendpage = sock_no_sendpage,
1336 #ifdef CONFIG_COMPAT
1337 .compat_setsockopt = compat_sock_common_setsockopt,
1338 .compat_getsockopt = compat_sock_common_getsockopt,
1339 #endif
1340 };
1341
1342 static struct inet_protosw rawv6_protosw = {
1343 .type = SOCK_RAW,
1344 .protocol = IPPROTO_IP, /* wild card */
1345 .prot = &rawv6_prot,
1346 .ops = &inet6_sockraw_ops,
1347 .no_check = UDP_CSUM_DEFAULT,
1348 .flags = INET_PROTOSW_REUSE,
1349 };
1350
1351 int __init rawv6_init(void)
1352 {
1353 int ret;
1354
1355 ret = inet6_register_protosw(&rawv6_protosw);
1356 if (ret)
1357 goto out;
1358 out:
1359 return ret;
1360 }
1361
1362 void rawv6_exit(void)
1363 {
1364 inet6_unregister_protosw(&rawv6_protosw);
1365 }
Linux kernel - Deliverables
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