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Merge branch 'for-3.8/core' of git://git.kernel.dk/linux-block
[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 <linux/compat.h>
35 #include <asm/uaccess.h>
36 #include <asm/ioctls.h>
37
38 #include <net/net_namespace.h>
39 #include <net/ip.h>
40 #include <net/sock.h>
41 #include <net/snmp.h>
42
43 #include <net/ipv6.h>
44 #include <net/ndisc.h>
45 #include <net/protocol.h>
46 #include <net/ip6_route.h>
47 #include <net/ip6_checksum.h>
48 #include <net/addrconf.h>
49 #include <net/transp_v6.h>
50 #include <net/udp.h>
51 #include <net/inet_common.h>
52 #include <net/tcp_states.h>
53 #if IS_ENABLED(CONFIG_IPV6_MIP6)
54 #include <net/mip6.h>
55 #endif
56 #include <linux/mroute6.h>
57
58 #include <net/raw.h>
59 #include <net/rawv6.h>
60 #include <net/xfrm.h>
61
62 #include <linux/proc_fs.h>
63 #include <linux/seq_file.h>
64 #include <linux/export.h>
65
66 static struct raw_hashinfo raw_v6_hashinfo = {
67 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
68 };
69
70 static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
71 unsigned short num, const struct in6_addr *loc_addr,
72 const struct in6_addr *rmt_addr, int dif)
73 {
74 struct hlist_node *node;
75 bool is_multicast = ipv6_addr_is_multicast(loc_addr);
76
77 sk_for_each_from(sk, node)
78 if (inet_sk(sk)->inet_num == num) {
79 struct ipv6_pinfo *np = inet6_sk(sk);
80
81 if (!net_eq(sock_net(sk), net))
82 continue;
83
84 if (!ipv6_addr_any(&np->daddr) &&
85 !ipv6_addr_equal(&np->daddr, rmt_addr))
86 continue;
87
88 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
89 continue;
90
91 if (!ipv6_addr_any(&np->rcv_saddr)) {
92 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
93 goto found;
94 if (is_multicast &&
95 inet6_mc_check(sk, loc_addr, rmt_addr))
96 goto found;
97 continue;
98 }
99 goto found;
100 }
101 sk = NULL;
102 found:
103 return sk;
104 }
105
106 /*
107 * 0 - deliver
108 * 1 - block
109 */
110 static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
111 {
112 struct icmp6hdr *_hdr;
113 const struct icmp6hdr *hdr;
114
115 hdr = skb_header_pointer(skb, skb_transport_offset(skb),
116 sizeof(_hdr), &_hdr);
117 if (hdr) {
118 const __u32 *data = &raw6_sk(sk)->filter.data[0];
119 unsigned int type = hdr->icmp6_type;
120
121 return (data[type >> 5] & (1U << (type & 31))) != 0;
122 }
123 return 1;
124 }
125
126 #if IS_ENABLED(CONFIG_IPV6_MIP6)
127 typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
128
129 static mh_filter_t __rcu *mh_filter __read_mostly;
130
131 int rawv6_mh_filter_register(mh_filter_t filter)
132 {
133 rcu_assign_pointer(mh_filter, filter);
134 return 0;
135 }
136 EXPORT_SYMBOL(rawv6_mh_filter_register);
137
138 int rawv6_mh_filter_unregister(mh_filter_t filter)
139 {
140 RCU_INIT_POINTER(mh_filter, NULL);
141 synchronize_rcu();
142 return 0;
143 }
144 EXPORT_SYMBOL(rawv6_mh_filter_unregister);
145
146 #endif
147
148 /*
149 * demultiplex raw sockets.
150 * (should consider queueing the skb in the sock receive_queue
151 * without calling rawv6.c)
152 *
153 * Caller owns SKB so we must make clones.
154 */
155 static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
156 {
157 const struct in6_addr *saddr;
158 const struct in6_addr *daddr;
159 struct sock *sk;
160 bool delivered = false;
161 __u8 hash;
162 struct net *net;
163
164 saddr = &ipv6_hdr(skb)->saddr;
165 daddr = saddr + 1;
166
167 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
168
169 read_lock(&raw_v6_hashinfo.lock);
170 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
171
172 if (sk == NULL)
173 goto out;
174
175 net = dev_net(skb->dev);
176 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
177
178 while (sk) {
179 int filtered;
180
181 delivered = true;
182 switch (nexthdr) {
183 case IPPROTO_ICMPV6:
184 filtered = icmpv6_filter(sk, skb);
185 break;
186
187 #if IS_ENABLED(CONFIG_IPV6_MIP6)
188 case IPPROTO_MH:
189 {
190 /* XXX: To validate MH only once for each packet,
191 * this is placed here. It should be after checking
192 * xfrm policy, however it doesn't. The checking xfrm
193 * policy is placed in rawv6_rcv() because it is
194 * required for each socket.
195 */
196 mh_filter_t *filter;
197
198 filter = rcu_dereference(mh_filter);
199 filtered = filter ? (*filter)(sk, skb) : 0;
200 break;
201 }
202 #endif
203 default:
204 filtered = 0;
205 break;
206 }
207
208 if (filtered < 0)
209 break;
210 if (filtered == 0) {
211 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
212
213 /* Not releasing hash table! */
214 if (clone) {
215 nf_reset(clone);
216 rawv6_rcv(sk, clone);
217 }
218 }
219 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
220 IP6CB(skb)->iif);
221 }
222 out:
223 read_unlock(&raw_v6_hashinfo.lock);
224 return delivered;
225 }
226
227 bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
228 {
229 struct sock *raw_sk;
230
231 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]);
232 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
233 raw_sk = NULL;
234
235 return raw_sk != NULL;
236 }
237
238 /* This cleans up af_inet6 a bit. -DaveM */
239 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
240 {
241 struct inet_sock *inet = inet_sk(sk);
242 struct ipv6_pinfo *np = inet6_sk(sk);
243 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
244 __be32 v4addr = 0;
245 int addr_type;
246 int err;
247
248 if (addr_len < SIN6_LEN_RFC2133)
249 return -EINVAL;
250 addr_type = ipv6_addr_type(&addr->sin6_addr);
251
252 /* Raw sockets are IPv6 only */
253 if (addr_type == IPV6_ADDR_MAPPED)
254 return -EADDRNOTAVAIL;
255
256 lock_sock(sk);
257
258 err = -EINVAL;
259 if (sk->sk_state != TCP_CLOSE)
260 goto out;
261
262 rcu_read_lock();
263 /* Check if the address belongs to the host. */
264 if (addr_type != IPV6_ADDR_ANY) {
265 struct net_device *dev = NULL;
266
267 if (addr_type & IPV6_ADDR_LINKLOCAL) {
268 if (addr_len >= sizeof(struct sockaddr_in6) &&
269 addr->sin6_scope_id) {
270 /* Override any existing binding, if another
271 * one is supplied by user.
272 */
273 sk->sk_bound_dev_if = addr->sin6_scope_id;
274 }
275
276 /* Binding to link-local address requires an interface */
277 if (!sk->sk_bound_dev_if)
278 goto out_unlock;
279
280 err = -ENODEV;
281 dev = dev_get_by_index_rcu(sock_net(sk),
282 sk->sk_bound_dev_if);
283 if (!dev)
284 goto out_unlock;
285 }
286
287 /* ipv4 addr of the socket is invalid. Only the
288 * unspecified and mapped address have a v4 equivalent.
289 */
290 v4addr = LOOPBACK4_IPV6;
291 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
292 err = -EADDRNOTAVAIL;
293 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
294 dev, 0)) {
295 goto out_unlock;
296 }
297 }
298 }
299
300 inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
301 np->rcv_saddr = addr->sin6_addr;
302 if (!(addr_type & IPV6_ADDR_MULTICAST))
303 np->saddr = addr->sin6_addr;
304 err = 0;
305 out_unlock:
306 rcu_read_unlock();
307 out:
308 release_sock(sk);
309 return err;
310 }
311
312 static void rawv6_err(struct sock *sk, struct sk_buff *skb,
313 struct inet6_skb_parm *opt,
314 u8 type, u8 code, int offset, __be32 info)
315 {
316 struct inet_sock *inet = inet_sk(sk);
317 struct ipv6_pinfo *np = inet6_sk(sk);
318 int err;
319 int harderr;
320
321 /* Report error on raw socket, if:
322 1. User requested recverr.
323 2. Socket is connected (otherwise the error indication
324 is useless without recverr and error is hard.
325 */
326 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
327 return;
328
329 harderr = icmpv6_err_convert(type, code, &err);
330 if (type == ICMPV6_PKT_TOOBIG) {
331 ip6_sk_update_pmtu(skb, sk, info);
332 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
333 }
334 if (type == NDISC_REDIRECT)
335 ip6_sk_redirect(skb, sk);
336 if (np->recverr) {
337 u8 *payload = skb->data;
338 if (!inet->hdrincl)
339 payload += offset;
340 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
341 }
342
343 if (np->recverr || harderr) {
344 sk->sk_err = err;
345 sk->sk_error_report(sk);
346 }
347 }
348
349 void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
350 u8 type, u8 code, int inner_offset, __be32 info)
351 {
352 struct sock *sk;
353 int hash;
354 const struct in6_addr *saddr, *daddr;
355 struct net *net;
356
357 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
358
359 read_lock(&raw_v6_hashinfo.lock);
360 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
361 if (sk != NULL) {
362 /* Note: ipv6_hdr(skb) != skb->data */
363 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
364 saddr = &ip6h->saddr;
365 daddr = &ip6h->daddr;
366 net = dev_net(skb->dev);
367
368 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
369 IP6CB(skb)->iif))) {
370 rawv6_err(sk, skb, NULL, type, code,
371 inner_offset, info);
372 sk = sk_next(sk);
373 }
374 }
375 read_unlock(&raw_v6_hashinfo.lock);
376 }
377
378 static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
379 {
380 if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
381 skb_checksum_complete(skb)) {
382 atomic_inc(&sk->sk_drops);
383 kfree_skb(skb);
384 return NET_RX_DROP;
385 }
386
387 /* Charge it to the socket. */
388 skb_dst_drop(skb);
389 if (sock_queue_rcv_skb(sk, skb) < 0) {
390 kfree_skb(skb);
391 return NET_RX_DROP;
392 }
393
394 return 0;
395 }
396
397 /*
398 * This is next to useless...
399 * if we demultiplex in network layer we don't need the extra call
400 * just to queue the skb...
401 * maybe we could have the network decide upon a hint if it
402 * should call raw_rcv for demultiplexing
403 */
404 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
405 {
406 struct inet_sock *inet = inet_sk(sk);
407 struct raw6_sock *rp = raw6_sk(sk);
408
409 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
410 atomic_inc(&sk->sk_drops);
411 kfree_skb(skb);
412 return NET_RX_DROP;
413 }
414
415 if (!rp->checksum)
416 skb->ip_summed = CHECKSUM_UNNECESSARY;
417
418 if (skb->ip_summed == CHECKSUM_COMPLETE) {
419 skb_postpull_rcsum(skb, skb_network_header(skb),
420 skb_network_header_len(skb));
421 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
422 &ipv6_hdr(skb)->daddr,
423 skb->len, inet->inet_num, skb->csum))
424 skb->ip_summed = CHECKSUM_UNNECESSARY;
425 }
426 if (!skb_csum_unnecessary(skb))
427 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
428 &ipv6_hdr(skb)->daddr,
429 skb->len,
430 inet->inet_num, 0));
431
432 if (inet->hdrincl) {
433 if (skb_checksum_complete(skb)) {
434 atomic_inc(&sk->sk_drops);
435 kfree_skb(skb);
436 return NET_RX_DROP;
437 }
438 }
439
440 rawv6_rcv_skb(sk, skb);
441 return 0;
442 }
443
444
445 /*
446 * This should be easy, if there is something there
447 * we return it, otherwise we block.
448 */
449
450 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
451 struct msghdr *msg, size_t len,
452 int noblock, int flags, int *addr_len)
453 {
454 struct ipv6_pinfo *np = inet6_sk(sk);
455 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
456 struct sk_buff *skb;
457 size_t copied;
458 int err;
459
460 if (flags & MSG_OOB)
461 return -EOPNOTSUPP;
462
463 if (addr_len)
464 *addr_len=sizeof(*sin6);
465
466 if (flags & MSG_ERRQUEUE)
467 return ipv6_recv_error(sk, msg, len);
468
469 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
470 return ipv6_recv_rxpmtu(sk, msg, len);
471
472 skb = skb_recv_datagram(sk, flags, noblock, &err);
473 if (!skb)
474 goto out;
475
476 copied = skb->len;
477 if (copied > len) {
478 copied = len;
479 msg->msg_flags |= MSG_TRUNC;
480 }
481
482 if (skb_csum_unnecessary(skb)) {
483 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
484 } else if (msg->msg_flags&MSG_TRUNC) {
485 if (__skb_checksum_complete(skb))
486 goto csum_copy_err;
487 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
488 } else {
489 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
490 if (err == -EINVAL)
491 goto csum_copy_err;
492 }
493 if (err)
494 goto out_free;
495
496 /* Copy the address. */
497 if (sin6) {
498 sin6->sin6_family = AF_INET6;
499 sin6->sin6_port = 0;
500 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
501 sin6->sin6_flowinfo = 0;
502 sin6->sin6_scope_id = 0;
503 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
504 sin6->sin6_scope_id = IP6CB(skb)->iif;
505 }
506
507 sock_recv_ts_and_drops(msg, sk, skb);
508
509 if (np->rxopt.all)
510 datagram_recv_ctl(sk, msg, skb);
511
512 err = copied;
513 if (flags & MSG_TRUNC)
514 err = skb->len;
515
516 out_free:
517 skb_free_datagram(sk, skb);
518 out:
519 return err;
520
521 csum_copy_err:
522 skb_kill_datagram(sk, skb, flags);
523
524 /* Error for blocking case is chosen to masquerade
525 as some normal condition.
526 */
527 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
528 goto out;
529 }
530
531 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
532 struct raw6_sock *rp)
533 {
534 struct sk_buff *skb;
535 int err = 0;
536 int offset;
537 int len;
538 int total_len;
539 __wsum tmp_csum;
540 __sum16 csum;
541
542 if (!rp->checksum)
543 goto send;
544
545 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
546 goto out;
547
548 offset = rp->offset;
549 total_len = inet_sk(sk)->cork.base.length;
550 if (offset >= total_len - 1) {
551 err = -EINVAL;
552 ip6_flush_pending_frames(sk);
553 goto out;
554 }
555
556 /* should be check HW csum miyazawa */
557 if (skb_queue_len(&sk->sk_write_queue) == 1) {
558 /*
559 * Only one fragment on the socket.
560 */
561 tmp_csum = skb->csum;
562 } else {
563 struct sk_buff *csum_skb = NULL;
564 tmp_csum = 0;
565
566 skb_queue_walk(&sk->sk_write_queue, skb) {
567 tmp_csum = csum_add(tmp_csum, skb->csum);
568
569 if (csum_skb)
570 continue;
571
572 len = skb->len - skb_transport_offset(skb);
573 if (offset >= len) {
574 offset -= len;
575 continue;
576 }
577
578 csum_skb = skb;
579 }
580
581 skb = csum_skb;
582 }
583
584 offset += skb_transport_offset(skb);
585 if (skb_copy_bits(skb, offset, &csum, 2))
586 BUG();
587
588 /* in case cksum was not initialized */
589 if (unlikely(csum))
590 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
591
592 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
593 total_len, fl6->flowi6_proto, tmp_csum);
594
595 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
596 csum = CSUM_MANGLED_0;
597
598 if (skb_store_bits(skb, offset, &csum, 2))
599 BUG();
600
601 send:
602 err = ip6_push_pending_frames(sk);
603 out:
604 return err;
605 }
606
607 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
608 struct flowi6 *fl6, struct dst_entry **dstp,
609 unsigned int flags)
610 {
611 struct ipv6_pinfo *np = inet6_sk(sk);
612 struct ipv6hdr *iph;
613 struct sk_buff *skb;
614 int err;
615 struct rt6_info *rt = (struct rt6_info *)*dstp;
616 int hlen = LL_RESERVED_SPACE(rt->dst.dev);
617 int tlen = rt->dst.dev->needed_tailroom;
618
619 if (length > rt->dst.dev->mtu) {
620 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
621 return -EMSGSIZE;
622 }
623 if (flags&MSG_PROBE)
624 goto out;
625
626 skb = sock_alloc_send_skb(sk,
627 length + hlen + tlen + 15,
628 flags & MSG_DONTWAIT, &err);
629 if (skb == NULL)
630 goto error;
631 skb_reserve(skb, hlen);
632
633 skb->priority = sk->sk_priority;
634 skb->mark = sk->sk_mark;
635 skb_dst_set(skb, &rt->dst);
636 *dstp = NULL;
637
638 skb_put(skb, length);
639 skb_reset_network_header(skb);
640 iph = ipv6_hdr(skb);
641
642 skb->ip_summed = CHECKSUM_NONE;
643
644 skb->transport_header = skb->network_header;
645 err = memcpy_fromiovecend((void *)iph, from, 0, length);
646 if (err)
647 goto error_fault;
648
649 IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
650 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
651 rt->dst.dev, dst_output);
652 if (err > 0)
653 err = net_xmit_errno(err);
654 if (err)
655 goto error;
656 out:
657 return 0;
658
659 error_fault:
660 err = -EFAULT;
661 kfree_skb(skb);
662 error:
663 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
664 if (err == -ENOBUFS && !np->recverr)
665 err = 0;
666 return err;
667 }
668
669 static int rawv6_probe_proto_opt(struct flowi6 *fl6, struct msghdr *msg)
670 {
671 struct iovec *iov;
672 u8 __user *type = NULL;
673 u8 __user *code = NULL;
674 u8 len = 0;
675 int probed = 0;
676 int i;
677
678 if (!msg->msg_iov)
679 return 0;
680
681 for (i = 0; i < msg->msg_iovlen; i++) {
682 iov = &msg->msg_iov[i];
683 if (!iov)
684 continue;
685
686 switch (fl6->flowi6_proto) {
687 case IPPROTO_ICMPV6:
688 /* check if one-byte field is readable or not. */
689 if (iov->iov_base && iov->iov_len < 1)
690 break;
691
692 if (!type) {
693 type = iov->iov_base;
694 /* check if code field is readable or not. */
695 if (iov->iov_len > 1)
696 code = type + 1;
697 } else if (!code)
698 code = iov->iov_base;
699
700 if (type && code) {
701 if (get_user(fl6->fl6_icmp_type, type) ||
702 get_user(fl6->fl6_icmp_code, code))
703 return -EFAULT;
704 probed = 1;
705 }
706 break;
707 case IPPROTO_MH:
708 if (iov->iov_base && iov->iov_len < 1)
709 break;
710 /* check if type field is readable or not. */
711 if (iov->iov_len > 2 - len) {
712 u8 __user *p = iov->iov_base;
713 if (get_user(fl6->fl6_mh_type, &p[2 - len]))
714 return -EFAULT;
715 probed = 1;
716 } else
717 len += iov->iov_len;
718
719 break;
720 default:
721 probed = 1;
722 break;
723 }
724 if (probed)
725 break;
726 }
727 return 0;
728 }
729
730 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
731 struct msghdr *msg, size_t len)
732 {
733 struct ipv6_txoptions opt_space;
734 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
735 struct in6_addr *daddr, *final_p, final;
736 struct inet_sock *inet = inet_sk(sk);
737 struct ipv6_pinfo *np = inet6_sk(sk);
738 struct raw6_sock *rp = raw6_sk(sk);
739 struct ipv6_txoptions *opt = NULL;
740 struct ip6_flowlabel *flowlabel = NULL;
741 struct dst_entry *dst = NULL;
742 struct flowi6 fl6;
743 int addr_len = msg->msg_namelen;
744 int hlimit = -1;
745 int tclass = -1;
746 int dontfrag = -1;
747 u16 proto;
748 int err;
749
750 /* Rough check on arithmetic overflow,
751 better check is made in ip6_append_data().
752 */
753 if (len > INT_MAX)
754 return -EMSGSIZE;
755
756 /* Mirror BSD error message compatibility */
757 if (msg->msg_flags & MSG_OOB)
758 return -EOPNOTSUPP;
759
760 /*
761 * Get and verify the address.
762 */
763 memset(&fl6, 0, sizeof(fl6));
764
765 fl6.flowi6_mark = sk->sk_mark;
766
767 if (sin6) {
768 if (addr_len < SIN6_LEN_RFC2133)
769 return -EINVAL;
770
771 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
772 return -EAFNOSUPPORT;
773
774 /* port is the proto value [0..255] carried in nexthdr */
775 proto = ntohs(sin6->sin6_port);
776
777 if (!proto)
778 proto = inet->inet_num;
779 else if (proto != inet->inet_num)
780 return -EINVAL;
781
782 if (proto > 255)
783 return -EINVAL;
784
785 daddr = &sin6->sin6_addr;
786 if (np->sndflow) {
787 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
788 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
789 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
790 if (flowlabel == NULL)
791 return -EINVAL;
792 daddr = &flowlabel->dst;
793 }
794 }
795
796 /*
797 * Otherwise it will be difficult to maintain
798 * sk->sk_dst_cache.
799 */
800 if (sk->sk_state == TCP_ESTABLISHED &&
801 ipv6_addr_equal(daddr, &np->daddr))
802 daddr = &np->daddr;
803
804 if (addr_len >= sizeof(struct sockaddr_in6) &&
805 sin6->sin6_scope_id &&
806 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
807 fl6.flowi6_oif = sin6->sin6_scope_id;
808 } else {
809 if (sk->sk_state != TCP_ESTABLISHED)
810 return -EDESTADDRREQ;
811
812 proto = inet->inet_num;
813 daddr = &np->daddr;
814 fl6.flowlabel = np->flow_label;
815 }
816
817 if (fl6.flowi6_oif == 0)
818 fl6.flowi6_oif = sk->sk_bound_dev_if;
819
820 if (msg->msg_controllen) {
821 opt = &opt_space;
822 memset(opt, 0, sizeof(struct ipv6_txoptions));
823 opt->tot_len = sizeof(struct ipv6_txoptions);
824
825 err = datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
826 &hlimit, &tclass, &dontfrag);
827 if (err < 0) {
828 fl6_sock_release(flowlabel);
829 return err;
830 }
831 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
832 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
833 if (flowlabel == NULL)
834 return -EINVAL;
835 }
836 if (!(opt->opt_nflen|opt->opt_flen))
837 opt = NULL;
838 }
839 if (opt == NULL)
840 opt = np->opt;
841 if (flowlabel)
842 opt = fl6_merge_options(&opt_space, flowlabel, opt);
843 opt = ipv6_fixup_options(&opt_space, opt);
844
845 fl6.flowi6_proto = proto;
846 err = rawv6_probe_proto_opt(&fl6, msg);
847 if (err)
848 goto out;
849
850 if (!ipv6_addr_any(daddr))
851 fl6.daddr = *daddr;
852 else
853 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
854 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
855 fl6.saddr = np->saddr;
856
857 final_p = fl6_update_dst(&fl6, opt, &final);
858
859 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
860 fl6.flowi6_oif = np->mcast_oif;
861 else if (!fl6.flowi6_oif)
862 fl6.flowi6_oif = np->ucast_oif;
863 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
864
865 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
866 if (IS_ERR(dst)) {
867 err = PTR_ERR(dst);
868 goto out;
869 }
870 if (hlimit < 0) {
871 if (ipv6_addr_is_multicast(&fl6.daddr))
872 hlimit = np->mcast_hops;
873 else
874 hlimit = np->hop_limit;
875 if (hlimit < 0)
876 hlimit = ip6_dst_hoplimit(dst);
877 }
878
879 if (tclass < 0)
880 tclass = np->tclass;
881
882 if (dontfrag < 0)
883 dontfrag = np->dontfrag;
884
885 if (msg->msg_flags&MSG_CONFIRM)
886 goto do_confirm;
887
888 back_from_confirm:
889 if (inet->hdrincl)
890 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl6, &dst, msg->msg_flags);
891 else {
892 lock_sock(sk);
893 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
894 len, 0, hlimit, tclass, opt, &fl6, (struct rt6_info*)dst,
895 msg->msg_flags, dontfrag);
896
897 if (err)
898 ip6_flush_pending_frames(sk);
899 else if (!(msg->msg_flags & MSG_MORE))
900 err = rawv6_push_pending_frames(sk, &fl6, rp);
901 release_sock(sk);
902 }
903 done:
904 dst_release(dst);
905 out:
906 fl6_sock_release(flowlabel);
907 return err<0?err:len;
908 do_confirm:
909 dst_confirm(dst);
910 if (!(msg->msg_flags & MSG_PROBE) || len)
911 goto back_from_confirm;
912 err = 0;
913 goto done;
914 }
915
916 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
917 char __user *optval, int optlen)
918 {
919 switch (optname) {
920 case ICMPV6_FILTER:
921 if (optlen > sizeof(struct icmp6_filter))
922 optlen = sizeof(struct icmp6_filter);
923 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
924 return -EFAULT;
925 return 0;
926 default:
927 return -ENOPROTOOPT;
928 }
929
930 return 0;
931 }
932
933 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
934 char __user *optval, int __user *optlen)
935 {
936 int len;
937
938 switch (optname) {
939 case ICMPV6_FILTER:
940 if (get_user(len, optlen))
941 return -EFAULT;
942 if (len < 0)
943 return -EINVAL;
944 if (len > sizeof(struct icmp6_filter))
945 len = sizeof(struct icmp6_filter);
946 if (put_user(len, optlen))
947 return -EFAULT;
948 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
949 return -EFAULT;
950 return 0;
951 default:
952 return -ENOPROTOOPT;
953 }
954
955 return 0;
956 }
957
958
959 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
960 char __user *optval, unsigned int optlen)
961 {
962 struct raw6_sock *rp = raw6_sk(sk);
963 int val;
964
965 if (get_user(val, (int __user *)optval))
966 return -EFAULT;
967
968 switch (optname) {
969 case IPV6_CHECKSUM:
970 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
971 level == IPPROTO_IPV6) {
972 /*
973 * RFC3542 tells that IPV6_CHECKSUM socket
974 * option in the IPPROTO_IPV6 level is not
975 * allowed on ICMPv6 sockets.
976 * If you want to set it, use IPPROTO_RAW
977 * level IPV6_CHECKSUM socket option
978 * (Linux extension).
979 */
980 return -EINVAL;
981 }
982
983 /* You may get strange result with a positive odd offset;
984 RFC2292bis agrees with me. */
985 if (val > 0 && (val&1))
986 return -EINVAL;
987 if (val < 0) {
988 rp->checksum = 0;
989 } else {
990 rp->checksum = 1;
991 rp->offset = val;
992 }
993
994 return 0;
995
996 default:
997 return -ENOPROTOOPT;
998 }
999 }
1000
1001 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1002 char __user *optval, unsigned int optlen)
1003 {
1004 switch (level) {
1005 case SOL_RAW:
1006 break;
1007
1008 case SOL_ICMPV6:
1009 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1010 return -EOPNOTSUPP;
1011 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1012 case SOL_IPV6:
1013 if (optname == IPV6_CHECKSUM)
1014 break;
1015 default:
1016 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1017 }
1018
1019 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1020 }
1021
1022 #ifdef CONFIG_COMPAT
1023 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1024 char __user *optval, unsigned int optlen)
1025 {
1026 switch (level) {
1027 case SOL_RAW:
1028 break;
1029 case SOL_ICMPV6:
1030 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1031 return -EOPNOTSUPP;
1032 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1033 case SOL_IPV6:
1034 if (optname == IPV6_CHECKSUM)
1035 break;
1036 default:
1037 return compat_ipv6_setsockopt(sk, level, optname,
1038 optval, optlen);
1039 }
1040 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1041 }
1042 #endif
1043
1044 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1045 char __user *optval, int __user *optlen)
1046 {
1047 struct raw6_sock *rp = raw6_sk(sk);
1048 int val, len;
1049
1050 if (get_user(len,optlen))
1051 return -EFAULT;
1052
1053 switch (optname) {
1054 case IPV6_CHECKSUM:
1055 /*
1056 * We allow getsockopt() for IPPROTO_IPV6-level
1057 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1058 * since RFC3542 is silent about it.
1059 */
1060 if (rp->checksum == 0)
1061 val = -1;
1062 else
1063 val = rp->offset;
1064 break;
1065
1066 default:
1067 return -ENOPROTOOPT;
1068 }
1069
1070 len = min_t(unsigned int, sizeof(int), len);
1071
1072 if (put_user(len, optlen))
1073 return -EFAULT;
1074 if (copy_to_user(optval,&val,len))
1075 return -EFAULT;
1076 return 0;
1077 }
1078
1079 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1080 char __user *optval, int __user *optlen)
1081 {
1082 switch (level) {
1083 case SOL_RAW:
1084 break;
1085
1086 case SOL_ICMPV6:
1087 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1088 return -EOPNOTSUPP;
1089 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1090 case SOL_IPV6:
1091 if (optname == IPV6_CHECKSUM)
1092 break;
1093 default:
1094 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1095 }
1096
1097 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1098 }
1099
1100 #ifdef CONFIG_COMPAT
1101 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1102 char __user *optval, int __user *optlen)
1103 {
1104 switch (level) {
1105 case SOL_RAW:
1106 break;
1107 case SOL_ICMPV6:
1108 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1109 return -EOPNOTSUPP;
1110 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1111 case SOL_IPV6:
1112 if (optname == IPV6_CHECKSUM)
1113 break;
1114 default:
1115 return compat_ipv6_getsockopt(sk, level, optname,
1116 optval, optlen);
1117 }
1118 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1119 }
1120 #endif
1121
1122 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1123 {
1124 switch (cmd) {
1125 case SIOCOUTQ: {
1126 int amount = sk_wmem_alloc_get(sk);
1127
1128 return put_user(amount, (int __user *)arg);
1129 }
1130 case SIOCINQ: {
1131 struct sk_buff *skb;
1132 int amount = 0;
1133
1134 spin_lock_bh(&sk->sk_receive_queue.lock);
1135 skb = skb_peek(&sk->sk_receive_queue);
1136 if (skb != NULL)
1137 amount = skb->tail - skb->transport_header;
1138 spin_unlock_bh(&sk->sk_receive_queue.lock);
1139 return put_user(amount, (int __user *)arg);
1140 }
1141
1142 default:
1143 #ifdef CONFIG_IPV6_MROUTE
1144 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1145 #else
1146 return -ENOIOCTLCMD;
1147 #endif
1148 }
1149 }
1150
1151 #ifdef CONFIG_COMPAT
1152 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1153 {
1154 switch (cmd) {
1155 case SIOCOUTQ:
1156 case SIOCINQ:
1157 return -ENOIOCTLCMD;
1158 default:
1159 #ifdef CONFIG_IPV6_MROUTE
1160 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1161 #else
1162 return -ENOIOCTLCMD;
1163 #endif
1164 }
1165 }
1166 #endif
1167
1168 static void rawv6_close(struct sock *sk, long timeout)
1169 {
1170 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1171 ip6_ra_control(sk, -1);
1172 ip6mr_sk_done(sk);
1173 sk_common_release(sk);
1174 }
1175
1176 static void raw6_destroy(struct sock *sk)
1177 {
1178 lock_sock(sk);
1179 ip6_flush_pending_frames(sk);
1180 release_sock(sk);
1181
1182 inet6_destroy_sock(sk);
1183 }
1184
1185 static int rawv6_init_sk(struct sock *sk)
1186 {
1187 struct raw6_sock *rp = raw6_sk(sk);
1188
1189 switch (inet_sk(sk)->inet_num) {
1190 case IPPROTO_ICMPV6:
1191 rp->checksum = 1;
1192 rp->offset = 2;
1193 break;
1194 case IPPROTO_MH:
1195 rp->checksum = 1;
1196 rp->offset = 4;
1197 break;
1198 default:
1199 break;
1200 }
1201 return 0;
1202 }
1203
1204 struct proto rawv6_prot = {
1205 .name = "RAWv6",
1206 .owner = THIS_MODULE,
1207 .close = rawv6_close,
1208 .destroy = raw6_destroy,
1209 .connect = ip6_datagram_connect,
1210 .disconnect = udp_disconnect,
1211 .ioctl = rawv6_ioctl,
1212 .init = rawv6_init_sk,
1213 .setsockopt = rawv6_setsockopt,
1214 .getsockopt = rawv6_getsockopt,
1215 .sendmsg = rawv6_sendmsg,
1216 .recvmsg = rawv6_recvmsg,
1217 .bind = rawv6_bind,
1218 .backlog_rcv = rawv6_rcv_skb,
1219 .hash = raw_hash_sk,
1220 .unhash = raw_unhash_sk,
1221 .obj_size = sizeof(struct raw6_sock),
1222 .h.raw_hash = &raw_v6_hashinfo,
1223 #ifdef CONFIG_COMPAT
1224 .compat_setsockopt = compat_rawv6_setsockopt,
1225 .compat_getsockopt = compat_rawv6_getsockopt,
1226 .compat_ioctl = compat_rawv6_ioctl,
1227 #endif
1228 };
1229
1230 #ifdef CONFIG_PROC_FS
1231 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1232 {
1233 struct ipv6_pinfo *np = inet6_sk(sp);
1234 const struct in6_addr *dest, *src;
1235 __u16 destp, srcp;
1236
1237 dest = &np->daddr;
1238 src = &np->rcv_saddr;
1239 destp = 0;
1240 srcp = inet_sk(sp)->inet_num;
1241 seq_printf(seq,
1242 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1243 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
1244 i,
1245 src->s6_addr32[0], src->s6_addr32[1],
1246 src->s6_addr32[2], src->s6_addr32[3], srcp,
1247 dest->s6_addr32[0], dest->s6_addr32[1],
1248 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1249 sp->sk_state,
1250 sk_wmem_alloc_get(sp),
1251 sk_rmem_alloc_get(sp),
1252 0, 0L, 0,
1253 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1254 0,
1255 sock_i_ino(sp),
1256 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1257 }
1258
1259 static int raw6_seq_show(struct seq_file *seq, void *v)
1260 {
1261 if (v == SEQ_START_TOKEN)
1262 seq_printf(seq,
1263 " sl "
1264 "local_address "
1265 "remote_address "
1266 "st tx_queue rx_queue tr tm->when retrnsmt"
1267 " uid timeout inode ref pointer drops\n");
1268 else
1269 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1270 return 0;
1271 }
1272
1273 static const struct seq_operations raw6_seq_ops = {
1274 .start = raw_seq_start,
1275 .next = raw_seq_next,
1276 .stop = raw_seq_stop,
1277 .show = raw6_seq_show,
1278 };
1279
1280 static int raw6_seq_open(struct inode *inode, struct file *file)
1281 {
1282 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1283 }
1284
1285 static const struct file_operations raw6_seq_fops = {
1286 .owner = THIS_MODULE,
1287 .open = raw6_seq_open,
1288 .read = seq_read,
1289 .llseek = seq_lseek,
1290 .release = seq_release_net,
1291 };
1292
1293 static int __net_init raw6_init_net(struct net *net)
1294 {
1295 if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops))
1296 return -ENOMEM;
1297
1298 return 0;
1299 }
1300
1301 static void __net_exit raw6_exit_net(struct net *net)
1302 {
1303 proc_net_remove(net, "raw6");
1304 }
1305
1306 static struct pernet_operations raw6_net_ops = {
1307 .init = raw6_init_net,
1308 .exit = raw6_exit_net,
1309 };
1310
1311 int __init raw6_proc_init(void)
1312 {
1313 return register_pernet_subsys(&raw6_net_ops);
1314 }
1315
1316 void raw6_proc_exit(void)
1317 {
1318 unregister_pernet_subsys(&raw6_net_ops);
1319 }
1320 #endif /* CONFIG_PROC_FS */
1321
1322 /* Same as inet6_dgram_ops, sans udp_poll. */
1323 static const struct proto_ops inet6_sockraw_ops = {
1324 .family = PF_INET6,
1325 .owner = THIS_MODULE,
1326 .release = inet6_release,
1327 .bind = inet6_bind,
1328 .connect = inet_dgram_connect, /* ok */
1329 .socketpair = sock_no_socketpair, /* a do nothing */
1330 .accept = sock_no_accept, /* a do nothing */
1331 .getname = inet6_getname,
1332 .poll = datagram_poll, /* ok */
1333 .ioctl = inet6_ioctl, /* must change */
1334 .listen = sock_no_listen, /* ok */
1335 .shutdown = inet_shutdown, /* ok */
1336 .setsockopt = sock_common_setsockopt, /* ok */
1337 .getsockopt = sock_common_getsockopt, /* ok */
1338 .sendmsg = inet_sendmsg, /* ok */
1339 .recvmsg = sock_common_recvmsg, /* ok */
1340 .mmap = sock_no_mmap,
1341 .sendpage = sock_no_sendpage,
1342 #ifdef CONFIG_COMPAT
1343 .compat_setsockopt = compat_sock_common_setsockopt,
1344 .compat_getsockopt = compat_sock_common_getsockopt,
1345 #endif
1346 };
1347
1348 static struct inet_protosw rawv6_protosw = {
1349 .type = SOCK_RAW,
1350 .protocol = IPPROTO_IP, /* wild card */
1351 .prot = &rawv6_prot,
1352 .ops = &inet6_sockraw_ops,
1353 .no_check = UDP_CSUM_DEFAULT,
1354 .flags = INET_PROTOSW_REUSE,
1355 };
1356
1357 int __init rawv6_init(void)
1358 {
1359 int ret;
1360
1361 ret = inet6_register_protosw(&rawv6_protosw);
1362 if (ret)
1363 goto out;
1364 out:
1365 return ret;
1366 }
1367
1368 void rawv6_exit(void)
1369 {
1370 inet6_unregister_protosw(&rawv6_protosw);
1371 }
Linux kernel - Deliverables
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