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Merge tag 'please-pull-misc-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 #define ICMPV6_HDRLEN 4 /* ICMPv6 header, RFC 4443 Section 2.1 */
67
68 static struct raw_hashinfo raw_v6_hashinfo = {
69 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
70 };
71
72 static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
73 unsigned short num, const struct in6_addr *loc_addr,
74 const struct in6_addr *rmt_addr, int dif)
75 {
76 bool is_multicast = ipv6_addr_is_multicast(loc_addr);
77
78 sk_for_each_from(sk)
79 if (inet_sk(sk)->inet_num == num) {
80
81 if (!net_eq(sock_net(sk), net))
82 continue;
83
84 if (!ipv6_addr_any(&sk->sk_v6_daddr) &&
85 !ipv6_addr_equal(&sk->sk_v6_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(&sk->sk_v6_rcv_saddr)) {
92 if (ipv6_addr_equal(&sk->sk_v6_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 /* We require only the four bytes of the ICMPv6 header, not any
116 * additional bytes of message body in "struct icmp6hdr".
117 */
118 hdr = skb_header_pointer(skb, skb_transport_offset(skb),
119 ICMPV6_HDRLEN, &_hdr);
120 if (hdr) {
121 const __u32 *data = &raw6_sk(sk)->filter.data[0];
122 unsigned int type = hdr->icmp6_type;
123
124 return (data[type >> 5] & (1U << (type & 31))) != 0;
125 }
126 return 1;
127 }
128
129 #if IS_ENABLED(CONFIG_IPV6_MIP6)
130 typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
131
132 static mh_filter_t __rcu *mh_filter __read_mostly;
133
134 int rawv6_mh_filter_register(mh_filter_t filter)
135 {
136 rcu_assign_pointer(mh_filter, filter);
137 return 0;
138 }
139 EXPORT_SYMBOL(rawv6_mh_filter_register);
140
141 int rawv6_mh_filter_unregister(mh_filter_t filter)
142 {
143 RCU_INIT_POINTER(mh_filter, NULL);
144 synchronize_rcu();
145 return 0;
146 }
147 EXPORT_SYMBOL(rawv6_mh_filter_unregister);
148
149 #endif
150
151 /*
152 * demultiplex raw sockets.
153 * (should consider queueing the skb in the sock receive_queue
154 * without calling rawv6.c)
155 *
156 * Caller owns SKB so we must make clones.
157 */
158 static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
159 {
160 const struct in6_addr *saddr;
161 const struct in6_addr *daddr;
162 struct sock *sk;
163 bool delivered = false;
164 __u8 hash;
165 struct net *net;
166
167 saddr = &ipv6_hdr(skb)->saddr;
168 daddr = saddr + 1;
169
170 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
171
172 read_lock(&raw_v6_hashinfo.lock);
173 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
174
175 if (sk == NULL)
176 goto out;
177
178 net = dev_net(skb->dev);
179 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, inet6_iif(skb));
180
181 while (sk) {
182 int filtered;
183
184 delivered = true;
185 switch (nexthdr) {
186 case IPPROTO_ICMPV6:
187 filtered = icmpv6_filter(sk, skb);
188 break;
189
190 #if IS_ENABLED(CONFIG_IPV6_MIP6)
191 case IPPROTO_MH:
192 {
193 /* XXX: To validate MH only once for each packet,
194 * this is placed here. It should be after checking
195 * xfrm policy, however it doesn't. The checking xfrm
196 * policy is placed in rawv6_rcv() because it is
197 * required for each socket.
198 */
199 mh_filter_t *filter;
200
201 filter = rcu_dereference(mh_filter);
202 filtered = filter ? (*filter)(sk, skb) : 0;
203 break;
204 }
205 #endif
206 default:
207 filtered = 0;
208 break;
209 }
210
211 if (filtered < 0)
212 break;
213 if (filtered == 0) {
214 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
215
216 /* Not releasing hash table! */
217 if (clone) {
218 nf_reset(clone);
219 rawv6_rcv(sk, clone);
220 }
221 }
222 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
223 inet6_iif(skb));
224 }
225 out:
226 read_unlock(&raw_v6_hashinfo.lock);
227 return delivered;
228 }
229
230 bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
231 {
232 struct sock *raw_sk;
233
234 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]);
235 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
236 raw_sk = NULL;
237
238 return raw_sk != NULL;
239 }
240
241 /* This cleans up af_inet6 a bit. -DaveM */
242 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
243 {
244 struct inet_sock *inet = inet_sk(sk);
245 struct ipv6_pinfo *np = inet6_sk(sk);
246 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
247 __be32 v4addr = 0;
248 int addr_type;
249 int err;
250
251 if (addr_len < SIN6_LEN_RFC2133)
252 return -EINVAL;
253
254 if (addr->sin6_family != AF_INET6)
255 return -EINVAL;
256
257 addr_type = ipv6_addr_type(&addr->sin6_addr);
258
259 /* Raw sockets are IPv6 only */
260 if (addr_type == IPV6_ADDR_MAPPED)
261 return -EADDRNOTAVAIL;
262
263 lock_sock(sk);
264
265 err = -EINVAL;
266 if (sk->sk_state != TCP_CLOSE)
267 goto out;
268
269 rcu_read_lock();
270 /* Check if the address belongs to the host. */
271 if (addr_type != IPV6_ADDR_ANY) {
272 struct net_device *dev = NULL;
273
274 if (__ipv6_addr_needs_scope_id(addr_type)) {
275 if (addr_len >= sizeof(struct sockaddr_in6) &&
276 addr->sin6_scope_id) {
277 /* Override any existing binding, if another
278 * one is supplied by user.
279 */
280 sk->sk_bound_dev_if = addr->sin6_scope_id;
281 }
282
283 /* Binding to link-local address requires an interface */
284 if (!sk->sk_bound_dev_if)
285 goto out_unlock;
286
287 err = -ENODEV;
288 dev = dev_get_by_index_rcu(sock_net(sk),
289 sk->sk_bound_dev_if);
290 if (!dev)
291 goto out_unlock;
292 }
293
294 /* ipv4 addr of the socket is invalid. Only the
295 * unspecified and mapped address have a v4 equivalent.
296 */
297 v4addr = LOOPBACK4_IPV6;
298 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
299 err = -EADDRNOTAVAIL;
300 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
301 dev, 0)) {
302 goto out_unlock;
303 }
304 }
305 }
306
307 inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
308 sk->sk_v6_rcv_saddr = addr->sin6_addr;
309 if (!(addr_type & IPV6_ADDR_MULTICAST))
310 np->saddr = addr->sin6_addr;
311 err = 0;
312 out_unlock:
313 rcu_read_unlock();
314 out:
315 release_sock(sk);
316 return err;
317 }
318
319 static void rawv6_err(struct sock *sk, struct sk_buff *skb,
320 struct inet6_skb_parm *opt,
321 u8 type, u8 code, int offset, __be32 info)
322 {
323 struct inet_sock *inet = inet_sk(sk);
324 struct ipv6_pinfo *np = inet6_sk(sk);
325 int err;
326 int harderr;
327
328 /* Report error on raw socket, if:
329 1. User requested recverr.
330 2. Socket is connected (otherwise the error indication
331 is useless without recverr and error is hard.
332 */
333 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
334 return;
335
336 harderr = icmpv6_err_convert(type, code, &err);
337 if (type == ICMPV6_PKT_TOOBIG) {
338 ip6_sk_update_pmtu(skb, sk, info);
339 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
340 }
341 if (type == NDISC_REDIRECT) {
342 ip6_sk_redirect(skb, sk);
343 return;
344 }
345 if (np->recverr) {
346 u8 *payload = skb->data;
347 if (!inet->hdrincl)
348 payload += offset;
349 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
350 }
351
352 if (np->recverr || harderr) {
353 sk->sk_err = err;
354 sk->sk_error_report(sk);
355 }
356 }
357
358 void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
359 u8 type, u8 code, int inner_offset, __be32 info)
360 {
361 struct sock *sk;
362 int hash;
363 const struct in6_addr *saddr, *daddr;
364 struct net *net;
365
366 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
367
368 read_lock(&raw_v6_hashinfo.lock);
369 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
370 if (sk != NULL) {
371 /* Note: ipv6_hdr(skb) != skb->data */
372 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
373 saddr = &ip6h->saddr;
374 daddr = &ip6h->daddr;
375 net = dev_net(skb->dev);
376
377 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
378 inet6_iif(skb)))) {
379 rawv6_err(sk, skb, NULL, type, code,
380 inner_offset, info);
381 sk = sk_next(sk);
382 }
383 }
384 read_unlock(&raw_v6_hashinfo.lock);
385 }
386
387 static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
388 {
389 if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
390 skb_checksum_complete(skb)) {
391 atomic_inc(&sk->sk_drops);
392 kfree_skb(skb);
393 return NET_RX_DROP;
394 }
395
396 /* Charge it to the socket. */
397 skb_dst_drop(skb);
398 if (sock_queue_rcv_skb(sk, skb) < 0) {
399 kfree_skb(skb);
400 return NET_RX_DROP;
401 }
402
403 return 0;
404 }
405
406 /*
407 * This is next to useless...
408 * if we demultiplex in network layer we don't need the extra call
409 * just to queue the skb...
410 * maybe we could have the network decide upon a hint if it
411 * should call raw_rcv for demultiplexing
412 */
413 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
414 {
415 struct inet_sock *inet = inet_sk(sk);
416 struct raw6_sock *rp = raw6_sk(sk);
417
418 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
419 atomic_inc(&sk->sk_drops);
420 kfree_skb(skb);
421 return NET_RX_DROP;
422 }
423
424 if (!rp->checksum)
425 skb->ip_summed = CHECKSUM_UNNECESSARY;
426
427 if (skb->ip_summed == CHECKSUM_COMPLETE) {
428 skb_postpull_rcsum(skb, skb_network_header(skb),
429 skb_network_header_len(skb));
430 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
431 &ipv6_hdr(skb)->daddr,
432 skb->len, inet->inet_num, skb->csum))
433 skb->ip_summed = CHECKSUM_UNNECESSARY;
434 }
435 if (!skb_csum_unnecessary(skb))
436 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
437 &ipv6_hdr(skb)->daddr,
438 skb->len,
439 inet->inet_num, 0));
440
441 if (inet->hdrincl) {
442 if (skb_checksum_complete(skb)) {
443 atomic_inc(&sk->sk_drops);
444 kfree_skb(skb);
445 return NET_RX_DROP;
446 }
447 }
448
449 rawv6_rcv_skb(sk, skb);
450 return 0;
451 }
452
453
454 /*
455 * This should be easy, if there is something there
456 * we return it, otherwise we block.
457 */
458
459 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
460 struct msghdr *msg, size_t len,
461 int noblock, int flags, int *addr_len)
462 {
463 struct ipv6_pinfo *np = inet6_sk(sk);
464 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
465 struct sk_buff *skb;
466 size_t copied;
467 int err;
468
469 if (flags & MSG_OOB)
470 return -EOPNOTSUPP;
471
472 if (flags & MSG_ERRQUEUE)
473 return ipv6_recv_error(sk, msg, len, addr_len);
474
475 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
476 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
477
478 skb = skb_recv_datagram(sk, flags, noblock, &err);
479 if (!skb)
480 goto out;
481
482 copied = skb->len;
483 if (copied > len) {
484 copied = len;
485 msg->msg_flags |= MSG_TRUNC;
486 }
487
488 if (skb_csum_unnecessary(skb)) {
489 err = skb_copy_datagram_msg(skb, 0, msg, copied);
490 } else if (msg->msg_flags&MSG_TRUNC) {
491 if (__skb_checksum_complete(skb))
492 goto csum_copy_err;
493 err = skb_copy_datagram_msg(skb, 0, msg, copied);
494 } else {
495 err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
496 if (err == -EINVAL)
497 goto csum_copy_err;
498 }
499 if (err)
500 goto out_free;
501
502 /* Copy the address. */
503 if (sin6) {
504 sin6->sin6_family = AF_INET6;
505 sin6->sin6_port = 0;
506 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
507 sin6->sin6_flowinfo = 0;
508 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
509 inet6_iif(skb));
510 *addr_len = sizeof(*sin6);
511 }
512
513 sock_recv_ts_and_drops(msg, sk, skb);
514
515 if (np->rxopt.all)
516 ip6_datagram_recv_ctl(sk, msg, skb);
517
518 err = copied;
519 if (flags & MSG_TRUNC)
520 err = skb->len;
521
522 out_free:
523 skb_free_datagram(sk, skb);
524 out:
525 return err;
526
527 csum_copy_err:
528 skb_kill_datagram(sk, skb, flags);
529
530 /* Error for blocking case is chosen to masquerade
531 as some normal condition.
532 */
533 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
534 goto out;
535 }
536
537 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
538 struct raw6_sock *rp)
539 {
540 struct sk_buff *skb;
541 int err = 0;
542 int offset;
543 int len;
544 int total_len;
545 __wsum tmp_csum;
546 __sum16 csum;
547
548 if (!rp->checksum)
549 goto send;
550
551 skb = skb_peek(&sk->sk_write_queue);
552 if (!skb)
553 goto out;
554
555 offset = rp->offset;
556 total_len = inet_sk(sk)->cork.base.length;
557 if (offset >= total_len - 1) {
558 err = -EINVAL;
559 ip6_flush_pending_frames(sk);
560 goto out;
561 }
562
563 /* should be check HW csum miyazawa */
564 if (skb_queue_len(&sk->sk_write_queue) == 1) {
565 /*
566 * Only one fragment on the socket.
567 */
568 tmp_csum = skb->csum;
569 } else {
570 struct sk_buff *csum_skb = NULL;
571 tmp_csum = 0;
572
573 skb_queue_walk(&sk->sk_write_queue, skb) {
574 tmp_csum = csum_add(tmp_csum, skb->csum);
575
576 if (csum_skb)
577 continue;
578
579 len = skb->len - skb_transport_offset(skb);
580 if (offset >= len) {
581 offset -= len;
582 continue;
583 }
584
585 csum_skb = skb;
586 }
587
588 skb = csum_skb;
589 }
590
591 offset += skb_transport_offset(skb);
592 BUG_ON(skb_copy_bits(skb, offset, &csum, 2));
593
594 /* in case cksum was not initialized */
595 if (unlikely(csum))
596 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
597
598 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
599 total_len, fl6->flowi6_proto, tmp_csum);
600
601 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
602 csum = CSUM_MANGLED_0;
603
604 BUG_ON(skb_store_bits(skb, offset, &csum, 2));
605
606 send:
607 err = ip6_push_pending_frames(sk);
608 out:
609 return err;
610 }
611
612 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
613 struct flowi6 *fl6, struct dst_entry **dstp,
614 unsigned int flags)
615 {
616 struct ipv6_pinfo *np = inet6_sk(sk);
617 struct ipv6hdr *iph;
618 struct sk_buff *skb;
619 int err;
620 struct rt6_info *rt = (struct rt6_info *)*dstp;
621 int hlen = LL_RESERVED_SPACE(rt->dst.dev);
622 int tlen = rt->dst.dev->needed_tailroom;
623
624 if (length > rt->dst.dev->mtu) {
625 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
626 return -EMSGSIZE;
627 }
628 if (flags&MSG_PROBE)
629 goto out;
630
631 skb = sock_alloc_send_skb(sk,
632 length + hlen + tlen + 15,
633 flags & MSG_DONTWAIT, &err);
634 if (skb == NULL)
635 goto error;
636 skb_reserve(skb, hlen);
637
638 skb->protocol = htons(ETH_P_IPV6);
639 skb->priority = sk->sk_priority;
640 skb->mark = sk->sk_mark;
641 skb_dst_set(skb, &rt->dst);
642 *dstp = NULL;
643
644 skb_put(skb, length);
645 skb_reset_network_header(skb);
646 iph = ipv6_hdr(skb);
647
648 skb->ip_summed = CHECKSUM_NONE;
649
650 skb->transport_header = skb->network_header;
651 err = memcpy_fromiovecend((void *)iph, from, 0, length);
652 if (err)
653 goto error_fault;
654
655 IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
656 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
657 rt->dst.dev, dst_output);
658 if (err > 0)
659 err = net_xmit_errno(err);
660 if (err)
661 goto error;
662 out:
663 return 0;
664
665 error_fault:
666 err = -EFAULT;
667 kfree_skb(skb);
668 error:
669 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
670 if (err == -ENOBUFS && !np->recverr)
671 err = 0;
672 return err;
673 }
674
675 struct raw6_frag_vec {
676 struct msghdr *msg;
677 int hlen;
678 char c[4];
679 };
680
681 static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
682 {
683 int err = 0;
684 switch (fl6->flowi6_proto) {
685 case IPPROTO_ICMPV6:
686 rfv->hlen = 2;
687 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
688 if (!err) {
689 fl6->fl6_icmp_type = rfv->c[0];
690 fl6->fl6_icmp_code = rfv->c[1];
691 }
692 break;
693 case IPPROTO_MH:
694 rfv->hlen = 4;
695 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
696 if (!err)
697 fl6->fl6_mh_type = rfv->c[2];
698 }
699 return err;
700 }
701
702 static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
703 struct sk_buff *skb)
704 {
705 struct raw6_frag_vec *rfv = from;
706
707 if (offset < rfv->hlen) {
708 int copy = min(rfv->hlen - offset, len);
709
710 if (skb->ip_summed == CHECKSUM_PARTIAL)
711 memcpy(to, rfv->c + offset, copy);
712 else
713 skb->csum = csum_block_add(
714 skb->csum,
715 csum_partial_copy_nocheck(rfv->c + offset,
716 to, copy, 0),
717 odd);
718
719 odd = 0;
720 offset += copy;
721 to += copy;
722 len -= copy;
723
724 if (!len)
725 return 0;
726 }
727
728 offset -= rfv->hlen;
729
730 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
731 }
732
733 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
734 struct msghdr *msg, size_t len)
735 {
736 struct ipv6_txoptions opt_space;
737 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
738 struct in6_addr *daddr, *final_p, final;
739 struct inet_sock *inet = inet_sk(sk);
740 struct ipv6_pinfo *np = inet6_sk(sk);
741 struct raw6_sock *rp = raw6_sk(sk);
742 struct ipv6_txoptions *opt = NULL;
743 struct ip6_flowlabel *flowlabel = NULL;
744 struct dst_entry *dst = NULL;
745 struct raw6_frag_vec rfv;
746 struct flowi6 fl6;
747 int addr_len = msg->msg_namelen;
748 int hlimit = -1;
749 int tclass = -1;
750 int dontfrag = -1;
751 u16 proto;
752 int err;
753
754 /* Rough check on arithmetic overflow,
755 better check is made in ip6_append_data().
756 */
757 if (len > INT_MAX)
758 return -EMSGSIZE;
759
760 /* Mirror BSD error message compatibility */
761 if (msg->msg_flags & MSG_OOB)
762 return -EOPNOTSUPP;
763
764 /*
765 * Get and verify the address.
766 */
767 memset(&fl6, 0, sizeof(fl6));
768
769 fl6.flowi6_mark = sk->sk_mark;
770
771 if (sin6) {
772 if (addr_len < SIN6_LEN_RFC2133)
773 return -EINVAL;
774
775 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
776 return -EAFNOSUPPORT;
777
778 /* port is the proto value [0..255] carried in nexthdr */
779 proto = ntohs(sin6->sin6_port);
780
781 if (!proto)
782 proto = inet->inet_num;
783 else if (proto != inet->inet_num)
784 return -EINVAL;
785
786 if (proto > 255)
787 return -EINVAL;
788
789 daddr = &sin6->sin6_addr;
790 if (np->sndflow) {
791 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
792 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
793 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
794 if (flowlabel == NULL)
795 return -EINVAL;
796 }
797 }
798
799 /*
800 * Otherwise it will be difficult to maintain
801 * sk->sk_dst_cache.
802 */
803 if (sk->sk_state == TCP_ESTABLISHED &&
804 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
805 daddr = &sk->sk_v6_daddr;
806
807 if (addr_len >= sizeof(struct sockaddr_in6) &&
808 sin6->sin6_scope_id &&
809 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
810 fl6.flowi6_oif = sin6->sin6_scope_id;
811 } else {
812 if (sk->sk_state != TCP_ESTABLISHED)
813 return -EDESTADDRREQ;
814
815 proto = inet->inet_num;
816 daddr = &sk->sk_v6_daddr;
817 fl6.flowlabel = np->flow_label;
818 }
819
820 if (fl6.flowi6_oif == 0)
821 fl6.flowi6_oif = sk->sk_bound_dev_if;
822
823 if (msg->msg_controllen) {
824 opt = &opt_space;
825 memset(opt, 0, sizeof(struct ipv6_txoptions));
826 opt->tot_len = sizeof(struct ipv6_txoptions);
827
828 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
829 &hlimit, &tclass, &dontfrag);
830 if (err < 0) {
831 fl6_sock_release(flowlabel);
832 return err;
833 }
834 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
835 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
836 if (flowlabel == NULL)
837 return -EINVAL;
838 }
839 if (!(opt->opt_nflen|opt->opt_flen))
840 opt = NULL;
841 }
842 if (opt == NULL)
843 opt = np->opt;
844 if (flowlabel)
845 opt = fl6_merge_options(&opt_space, flowlabel, opt);
846 opt = ipv6_fixup_options(&opt_space, opt);
847
848 fl6.flowi6_proto = proto;
849 rfv.msg = msg;
850 rfv.hlen = 0;
851 err = rawv6_probe_proto_opt(&rfv, &fl6);
852 if (err)
853 goto out;
854
855 if (!ipv6_addr_any(daddr))
856 fl6.daddr = *daddr;
857 else
858 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
859 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
860 fl6.saddr = np->saddr;
861
862 final_p = fl6_update_dst(&fl6, opt, &final);
863
864 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
865 fl6.flowi6_oif = np->mcast_oif;
866 else if (!fl6.flowi6_oif)
867 fl6.flowi6_oif = np->ucast_oif;
868 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
869
870 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
871 if (IS_ERR(dst)) {
872 err = PTR_ERR(dst);
873 goto out;
874 }
875 if (hlimit < 0)
876 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
877
878 if (tclass < 0)
879 tclass = np->tclass;
880
881 if (dontfrag < 0)
882 dontfrag = np->dontfrag;
883
884 if (msg->msg_flags&MSG_CONFIRM)
885 goto do_confirm;
886
887 back_from_confirm:
888 if (inet->hdrincl)
889 /* XXX: stripping const */
890 err = rawv6_send_hdrinc(sk, (struct iovec *)msg->msg_iter.iov, len, &fl6, &dst, msg->msg_flags);
891 else {
892 lock_sock(sk);
893 err = ip6_append_data(sk, raw6_getfrag, &rfv,
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_pointer(skb) -
1138 skb_transport_header(skb);
1139 spin_unlock_bh(&sk->sk_receive_queue.lock);
1140 return put_user(amount, (int __user *)arg);
1141 }
1142
1143 default:
1144 #ifdef CONFIG_IPV6_MROUTE
1145 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1146 #else
1147 return -ENOIOCTLCMD;
1148 #endif
1149 }
1150 }
1151
1152 #ifdef CONFIG_COMPAT
1153 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1154 {
1155 switch (cmd) {
1156 case SIOCOUTQ:
1157 case SIOCINQ:
1158 return -ENOIOCTLCMD;
1159 default:
1160 #ifdef CONFIG_IPV6_MROUTE
1161 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1162 #else
1163 return -ENOIOCTLCMD;
1164 #endif
1165 }
1166 }
1167 #endif
1168
1169 static void rawv6_close(struct sock *sk, long timeout)
1170 {
1171 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1172 ip6_ra_control(sk, -1);
1173 ip6mr_sk_done(sk);
1174 sk_common_release(sk);
1175 }
1176
1177 static void raw6_destroy(struct sock *sk)
1178 {
1179 lock_sock(sk);
1180 ip6_flush_pending_frames(sk);
1181 release_sock(sk);
1182
1183 inet6_destroy_sock(sk);
1184 }
1185
1186 static int rawv6_init_sk(struct sock *sk)
1187 {
1188 struct raw6_sock *rp = raw6_sk(sk);
1189
1190 switch (inet_sk(sk)->inet_num) {
1191 case IPPROTO_ICMPV6:
1192 rp->checksum = 1;
1193 rp->offset = 2;
1194 break;
1195 case IPPROTO_MH:
1196 rp->checksum = 1;
1197 rp->offset = 4;
1198 break;
1199 default:
1200 break;
1201 }
1202 return 0;
1203 }
1204
1205 struct proto rawv6_prot = {
1206 .name = "RAWv6",
1207 .owner = THIS_MODULE,
1208 .close = rawv6_close,
1209 .destroy = raw6_destroy,
1210 .connect = ip6_datagram_connect_v6_only,
1211 .disconnect = udp_disconnect,
1212 .ioctl = rawv6_ioctl,
1213 .init = rawv6_init_sk,
1214 .setsockopt = rawv6_setsockopt,
1215 .getsockopt = rawv6_getsockopt,
1216 .sendmsg = rawv6_sendmsg,
1217 .recvmsg = rawv6_recvmsg,
1218 .bind = rawv6_bind,
1219 .backlog_rcv = rawv6_rcv_skb,
1220 .hash = raw_hash_sk,
1221 .unhash = raw_unhash_sk,
1222 .obj_size = sizeof(struct raw6_sock),
1223 .h.raw_hash = &raw_v6_hashinfo,
1224 #ifdef CONFIG_COMPAT
1225 .compat_setsockopt = compat_rawv6_setsockopt,
1226 .compat_getsockopt = compat_rawv6_getsockopt,
1227 .compat_ioctl = compat_rawv6_ioctl,
1228 #endif
1229 };
1230
1231 #ifdef CONFIG_PROC_FS
1232 static int raw6_seq_show(struct seq_file *seq, void *v)
1233 {
1234 if (v == SEQ_START_TOKEN) {
1235 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1236 } else {
1237 struct sock *sp = v;
1238 __u16 srcp = inet_sk(sp)->inet_num;
1239 ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1240 raw_seq_private(seq)->bucket);
1241 }
1242 return 0;
1243 }
1244
1245 static const struct seq_operations raw6_seq_ops = {
1246 .start = raw_seq_start,
1247 .next = raw_seq_next,
1248 .stop = raw_seq_stop,
1249 .show = raw6_seq_show,
1250 };
1251
1252 static int raw6_seq_open(struct inode *inode, struct file *file)
1253 {
1254 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1255 }
1256
1257 static const struct file_operations raw6_seq_fops = {
1258 .owner = THIS_MODULE,
1259 .open = raw6_seq_open,
1260 .read = seq_read,
1261 .llseek = seq_lseek,
1262 .release = seq_release_net,
1263 };
1264
1265 static int __net_init raw6_init_net(struct net *net)
1266 {
1267 if (!proc_create("raw6", S_IRUGO, net->proc_net, &raw6_seq_fops))
1268 return -ENOMEM;
1269
1270 return 0;
1271 }
1272
1273 static void __net_exit raw6_exit_net(struct net *net)
1274 {
1275 remove_proc_entry("raw6", net->proc_net);
1276 }
1277
1278 static struct pernet_operations raw6_net_ops = {
1279 .init = raw6_init_net,
1280 .exit = raw6_exit_net,
1281 };
1282
1283 int __init raw6_proc_init(void)
1284 {
1285 return register_pernet_subsys(&raw6_net_ops);
1286 }
1287
1288 void raw6_proc_exit(void)
1289 {
1290 unregister_pernet_subsys(&raw6_net_ops);
1291 }
1292 #endif /* CONFIG_PROC_FS */
1293
1294 /* Same as inet6_dgram_ops, sans udp_poll. */
1295 static const struct proto_ops inet6_sockraw_ops = {
1296 .family = PF_INET6,
1297 .owner = THIS_MODULE,
1298 .release = inet6_release,
1299 .bind = inet6_bind,
1300 .connect = inet_dgram_connect, /* ok */
1301 .socketpair = sock_no_socketpair, /* a do nothing */
1302 .accept = sock_no_accept, /* a do nothing */
1303 .getname = inet6_getname,
1304 .poll = datagram_poll, /* ok */
1305 .ioctl = inet6_ioctl, /* must change */
1306 .listen = sock_no_listen, /* ok */
1307 .shutdown = inet_shutdown, /* ok */
1308 .setsockopt = sock_common_setsockopt, /* ok */
1309 .getsockopt = sock_common_getsockopt, /* ok */
1310 .sendmsg = inet_sendmsg, /* ok */
1311 .recvmsg = sock_common_recvmsg, /* ok */
1312 .mmap = sock_no_mmap,
1313 .sendpage = sock_no_sendpage,
1314 #ifdef CONFIG_COMPAT
1315 .compat_setsockopt = compat_sock_common_setsockopt,
1316 .compat_getsockopt = compat_sock_common_getsockopt,
1317 #endif
1318 };
1319
1320 static struct inet_protosw rawv6_protosw = {
1321 .type = SOCK_RAW,
1322 .protocol = IPPROTO_IP, /* wild card */
1323 .prot = &rawv6_prot,
1324 .ops = &inet6_sockraw_ops,
1325 .flags = INET_PROTOSW_REUSE,
1326 };
1327
1328 int __init rawv6_init(void)
1329 {
1330 int ret;
1331
1332 ret = inet6_register_protosw(&rawv6_protosw);
1333 if (ret)
1334 goto out;
1335 out:
1336 return ret;
1337 }
1338
1339 void rawv6_exit(void)
1340 {
1341 inet6_unregister_protosw(&rawv6_protosw);
1342 }
Linux kernel - Deliverables
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