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Linux 4.1.16
[linux/fpc-iii.git] / net / ipv6 / raw.c
blob2c639aee12cb635886cbf9b1aee91372dbc727ba
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 <linux/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)
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) {
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 sock *sk, struct msghdr *msg, size_t len,
460 int noblock, int flags, int *addr_len)
461 {
462 struct ipv6_pinfo *np = inet6_sk(sk);
463 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
464 struct sk_buff *skb;
465 size_t copied;
466 int err;
467
468 if (flags & MSG_OOB)
469 return -EOPNOTSUPP;
470
471 if (flags & MSG_ERRQUEUE)
472 return ipv6_recv_error(sk, msg, len, addr_len);
473
474 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
475 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
476
477 skb = skb_recv_datagram(sk, flags, noblock, &err);
478 if (!skb)
479 goto out;
480
481 copied = skb->len;
482 if (copied > len) {
483 copied = len;
484 msg->msg_flags |= MSG_TRUNC;
485 }
486
487 if (skb_csum_unnecessary(skb)) {
488 err = skb_copy_datagram_msg(skb, 0, msg, copied);
489 } else if (msg->msg_flags&MSG_TRUNC) {
490 if (__skb_checksum_complete(skb))
491 goto csum_copy_err;
492 err = skb_copy_datagram_msg(skb, 0, msg, copied);
493 } else {
494 err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
495 if (err == -EINVAL)
496 goto csum_copy_err;
497 }
498 if (err)
499 goto out_free;
500
501 /* Copy the address. */
502 if (sin6) {
503 sin6->sin6_family = AF_INET6;
504 sin6->sin6_port = 0;
505 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
506 sin6->sin6_flowinfo = 0;
507 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
508 inet6_iif(skb));
509 *addr_len = sizeof(*sin6);
510 }
511
512 sock_recv_ts_and_drops(msg, sk, skb);
513
514 if (np->rxopt.all)
515 ip6_datagram_recv_ctl(sk, msg, skb);
516
517 err = copied;
518 if (flags & MSG_TRUNC)
519 err = skb->len;
520
521 out_free:
522 skb_free_datagram(sk, skb);
523 out:
524 return err;
525
526 csum_copy_err:
527 skb_kill_datagram(sk, skb, flags);
528
529 /* Error for blocking case is chosen to masquerade
530 as some normal condition.
531 */
532 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
533 goto out;
534 }
535
536 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
537 struct raw6_sock *rp)
538 {
539 struct sk_buff *skb;
540 int err = 0;
541 int offset;
542 int len;
543 int total_len;
544 __wsum tmp_csum;
545 __sum16 csum;
546
547 if (!rp->checksum)
548 goto send;
549
550 skb = skb_peek(&sk->sk_write_queue);
551 if (!skb)
552 goto out;
553
554 offset = rp->offset;
555 total_len = inet_sk(sk)->cork.base.length;
556 if (offset >= total_len - 1) {
557 err = -EINVAL;
558 ip6_flush_pending_frames(sk);
559 goto out;
560 }
561
562 /* should be check HW csum miyazawa */
563 if (skb_queue_len(&sk->sk_write_queue) == 1) {
564 /*
565 * Only one fragment on the socket.
566 */
567 tmp_csum = skb->csum;
568 } else {
569 struct sk_buff *csum_skb = NULL;
570 tmp_csum = 0;
571
572 skb_queue_walk(&sk->sk_write_queue, skb) {
573 tmp_csum = csum_add(tmp_csum, skb->csum);
574
575 if (csum_skb)
576 continue;
577
578 len = skb->len - skb_transport_offset(skb);
579 if (offset >= len) {
580 offset -= len;
581 continue;
582 }
583
584 csum_skb = skb;
585 }
586
587 skb = csum_skb;
588 }
589
590 offset += skb_transport_offset(skb);
591 BUG_ON(skb_copy_bits(skb, offset, &csum, 2));
592
593 /* in case cksum was not initialized */
594 if (unlikely(csum))
595 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
596
597 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
598 total_len, fl6->flowi6_proto, tmp_csum);
599
600 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
601 csum = CSUM_MANGLED_0;
602
603 BUG_ON(skb_store_bits(skb, offset, &csum, 2));
604
605 send:
606 err = ip6_push_pending_frames(sk);
607 out:
608 return err;
609 }
610
611 static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
612 struct flowi6 *fl6, struct dst_entry **dstp,
613 unsigned int flags)
614 {
615 struct ipv6_pinfo *np = inet6_sk(sk);
616 struct ipv6hdr *iph;
617 struct sk_buff *skb;
618 int err;
619 struct rt6_info *rt = (struct rt6_info *)*dstp;
620 int hlen = LL_RESERVED_SPACE(rt->dst.dev);
621 int tlen = rt->dst.dev->needed_tailroom;
622
623 if (length > rt->dst.dev->mtu) {
624 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
625 return -EMSGSIZE;
626 }
627 if (flags&MSG_PROBE)
628 goto out;
629
630 skb = sock_alloc_send_skb(sk,
631 length + hlen + tlen + 15,
632 flags & MSG_DONTWAIT, &err);
633 if (!skb)
634 goto error;
635 skb_reserve(skb, hlen);
636
637 skb->protocol = htons(ETH_P_IPV6);
638 skb->priority = sk->sk_priority;
639 skb->mark = sk->sk_mark;
640 skb_dst_set(skb, &rt->dst);
641 *dstp = NULL;
642
643 skb_put(skb, length);
644 skb_reset_network_header(skb);
645 iph = ipv6_hdr(skb);
646
647 skb->ip_summed = CHECKSUM_NONE;
648
649 skb->transport_header = skb->network_header;
650 err = memcpy_from_msg(iph, msg, length);
651 if (err)
652 goto error_fault;
653
654 IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
655 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, sk, skb,
656 NULL, rt->dst.dev, dst_output_sk);
657 if (err > 0)
658 err = net_xmit_errno(err);
659 if (err)
660 goto error;
661 out:
662 return 0;
663
664 error_fault:
665 err = -EFAULT;
666 kfree_skb(skb);
667 error:
668 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
669 if (err == -ENOBUFS && !np->recverr)
670 err = 0;
671 return err;
672 }
673
674 struct raw6_frag_vec {
675 struct msghdr *msg;
676 int hlen;
677 char c[4];
678 };
679
680 static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
681 {
682 int err = 0;
683 switch (fl6->flowi6_proto) {
684 case IPPROTO_ICMPV6:
685 rfv->hlen = 2;
686 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
687 if (!err) {
688 fl6->fl6_icmp_type = rfv->c[0];
689 fl6->fl6_icmp_code = rfv->c[1];
690 }
691 break;
692 case IPPROTO_MH:
693 rfv->hlen = 4;
694 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
695 if (!err)
696 fl6->fl6_mh_type = rfv->c[2];
697 }
698 return err;
699 }
700
701 static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
702 struct sk_buff *skb)
703 {
704 struct raw6_frag_vec *rfv = from;
705
706 if (offset < rfv->hlen) {
707 int copy = min(rfv->hlen - offset, len);
708
709 if (skb->ip_summed == CHECKSUM_PARTIAL)
710 memcpy(to, rfv->c + offset, copy);
711 else
712 skb->csum = csum_block_add(
713 skb->csum,
714 csum_partial_copy_nocheck(rfv->c + offset,
715 to, copy, 0),
716 odd);
717
718 odd = 0;
719 offset += copy;
720 to += copy;
721 len -= copy;
722
723 if (!len)
724 return 0;
725 }
726
727 offset -= rfv->hlen;
728
729 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
730 }
731
732 static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
733 {
734 struct ipv6_txoptions *opt_to_free = NULL;
735 struct ipv6_txoptions opt_space;
736 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
737 struct in6_addr *daddr, *final_p, final;
738 struct inet_sock *inet = inet_sk(sk);
739 struct ipv6_pinfo *np = inet6_sk(sk);
740 struct raw6_sock *rp = raw6_sk(sk);
741 struct ipv6_txoptions *opt = NULL;
742 struct ip6_flowlabel *flowlabel = NULL;
743 struct dst_entry *dst = NULL;
744 struct raw6_frag_vec rfv;
745 struct flowi6 fl6;
746 int addr_len = msg->msg_namelen;
747 int hlimit = -1;
748 int tclass = -1;
749 int dontfrag = -1;
750 u16 proto;
751 int err;
752
753 /* Rough check on arithmetic overflow,
754 better check is made in ip6_append_data().
755 */
756 if (len > INT_MAX)
757 return -EMSGSIZE;
758
759 /* Mirror BSD error message compatibility */
760 if (msg->msg_flags & MSG_OOB)
761 return -EOPNOTSUPP;
762
763 /*
764 * Get and verify the address.
765 */
766 memset(&fl6, 0, sizeof(fl6));
767
768 fl6.flowi6_mark = sk->sk_mark;
769
770 if (sin6) {
771 if (addr_len < SIN6_LEN_RFC2133)
772 return -EINVAL;
773
774 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
775 return -EAFNOSUPPORT;
776
777 /* port is the proto value [0..255] carried in nexthdr */
778 proto = ntohs(sin6->sin6_port);
779
780 if (!proto)
781 proto = inet->inet_num;
782 else if (proto != inet->inet_num)
783 return -EINVAL;
784
785 if (proto > 255)
786 return -EINVAL;
787
788 daddr = &sin6->sin6_addr;
789 if (np->sndflow) {
790 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
791 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
792 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
793 if (!flowlabel)
794 return -EINVAL;
795 }
796 }
797
798 /*
799 * Otherwise it will be difficult to maintain
800 * sk->sk_dst_cache.
801 */
802 if (sk->sk_state == TCP_ESTABLISHED &&
803 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
804 daddr = &sk->sk_v6_daddr;
805
806 if (addr_len >= sizeof(struct sockaddr_in6) &&
807 sin6->sin6_scope_id &&
808 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
809 fl6.flowi6_oif = sin6->sin6_scope_id;
810 } else {
811 if (sk->sk_state != TCP_ESTABLISHED)
812 return -EDESTADDRREQ;
813
814 proto = inet->inet_num;
815 daddr = &sk->sk_v6_daddr;
816 fl6.flowlabel = np->flow_label;
817 }
818
819 if (fl6.flowi6_oif == 0)
820 fl6.flowi6_oif = sk->sk_bound_dev_if;
821
822 if (msg->msg_controllen) {
823 opt = &opt_space;
824 memset(opt, 0, sizeof(struct ipv6_txoptions));
825 opt->tot_len = sizeof(struct ipv6_txoptions);
826
827 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
828 &hlimit, &tclass, &dontfrag);
829 if (err < 0) {
830 fl6_sock_release(flowlabel);
831 return err;
832 }
833 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
834 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
835 if (!flowlabel)
836 return -EINVAL;
837 }
838 if (!(opt->opt_nflen|opt->opt_flen))
839 opt = NULL;
840 }
841 if (!opt) {
842 opt = txopt_get(np);
843 opt_to_free = opt;
844 }
845 if (flowlabel)
846 opt = fl6_merge_options(&opt_space, flowlabel, opt);
847 opt = ipv6_fixup_options(&opt_space, opt);
848
849 fl6.flowi6_proto = proto;
850 rfv.msg = msg;
851 rfv.hlen = 0;
852 err = rawv6_probe_proto_opt(&rfv, &fl6);
853 if (err)
854 goto out;
855
856 if (!ipv6_addr_any(daddr))
857 fl6.daddr = *daddr;
858 else
859 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
860 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
861 fl6.saddr = np->saddr;
862
863 final_p = fl6_update_dst(&fl6, opt, &final);
864
865 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
866 fl6.flowi6_oif = np->mcast_oif;
867 else if (!fl6.flowi6_oif)
868 fl6.flowi6_oif = np->ucast_oif;
869 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
870
871 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
872 if (IS_ERR(dst)) {
873 err = PTR_ERR(dst);
874 goto out;
875 }
876 if (hlimit < 0)
877 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
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, 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 txopt_put(opt_to_free);
908 return err < 0 ? err : len;
909 do_confirm:
910 dst_confirm(dst);
911 if (!(msg->msg_flags & MSG_PROBE) || len)
912 goto back_from_confirm;
913 err = 0;
914 goto done;
915 }
916
917 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
918 char __user *optval, int optlen)
919 {
920 switch (optname) {
921 case ICMPV6_FILTER:
922 if (optlen > sizeof(struct icmp6_filter))
923 optlen = sizeof(struct icmp6_filter);
924 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
925 return -EFAULT;
926 return 0;
927 default:
928 return -ENOPROTOOPT;
929 }
930
931 return 0;
932 }
933
934 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
935 char __user *optval, int __user *optlen)
936 {
937 int len;
938
939 switch (optname) {
940 case ICMPV6_FILTER:
941 if (get_user(len, optlen))
942 return -EFAULT;
943 if (len < 0)
944 return -EINVAL;
945 if (len > sizeof(struct icmp6_filter))
946 len = sizeof(struct icmp6_filter);
947 if (put_user(len, optlen))
948 return -EFAULT;
949 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
950 return -EFAULT;
951 return 0;
952 default:
953 return -ENOPROTOOPT;
954 }
955
956 return 0;
957 }
958
959
960 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
961 char __user *optval, unsigned int optlen)
962 {
963 struct raw6_sock *rp = raw6_sk(sk);
964 int val;
965
966 if (get_user(val, (int __user *)optval))
967 return -EFAULT;
968
969 switch (optname) {
970 case IPV6_CHECKSUM:
971 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
972 level == IPPROTO_IPV6) {
973 /*
974 * RFC3542 tells that IPV6_CHECKSUM socket
975 * option in the IPPROTO_IPV6 level is not
976 * allowed on ICMPv6 sockets.
977 * If you want to set it, use IPPROTO_RAW
978 * level IPV6_CHECKSUM socket option
979 * (Linux extension).
980 */
981 return -EINVAL;
982 }
983
984 /* You may get strange result with a positive odd offset;
985 RFC2292bis agrees with me. */
986 if (val > 0 && (val&1))
987 return -EINVAL;
988 if (val < 0) {
989 rp->checksum = 0;
990 } else {
991 rp->checksum = 1;
992 rp->offset = val;
993 }
994
995 return 0;
996
997 default:
998 return -ENOPROTOOPT;
999 }
1000 }
1001
1002 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1003 char __user *optval, unsigned int optlen)
1004 {
1005 switch (level) {
1006 case SOL_RAW:
1007 break;
1008
1009 case SOL_ICMPV6:
1010 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1011 return -EOPNOTSUPP;
1012 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1013 case SOL_IPV6:
1014 if (optname == IPV6_CHECKSUM)
1015 break;
1016 default:
1017 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1018 }
1019
1020 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1021 }
1022
1023 #ifdef CONFIG_COMPAT
1024 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1025 char __user *optval, unsigned int optlen)
1026 {
1027 switch (level) {
1028 case SOL_RAW:
1029 break;
1030 case SOL_ICMPV6:
1031 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1032 return -EOPNOTSUPP;
1033 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1034 case SOL_IPV6:
1035 if (optname == IPV6_CHECKSUM)
1036 break;
1037 default:
1038 return compat_ipv6_setsockopt(sk, level, optname,
1039 optval, optlen);
1040 }
1041 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1042 }
1043 #endif
1044
1045 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1046 char __user *optval, int __user *optlen)
1047 {
1048 struct raw6_sock *rp = raw6_sk(sk);
1049 int val, len;
1050
1051 if (get_user(len, optlen))
1052 return -EFAULT;
1053
1054 switch (optname) {
1055 case IPV6_CHECKSUM:
1056 /*
1057 * We allow getsockopt() for IPPROTO_IPV6-level
1058 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1059 * since RFC3542 is silent about it.
1060 */
1061 if (rp->checksum == 0)
1062 val = -1;
1063 else
1064 val = rp->offset;
1065 break;
1066
1067 default:
1068 return -ENOPROTOOPT;
1069 }
1070
1071 len = min_t(unsigned int, sizeof(int), len);
1072
1073 if (put_user(len, optlen))
1074 return -EFAULT;
1075 if (copy_to_user(optval, &val, len))
1076 return -EFAULT;
1077 return 0;
1078 }
1079
1080 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1081 char __user *optval, int __user *optlen)
1082 {
1083 switch (level) {
1084 case SOL_RAW:
1085 break;
1086
1087 case SOL_ICMPV6:
1088 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1089 return -EOPNOTSUPP;
1090 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1091 case SOL_IPV6:
1092 if (optname == IPV6_CHECKSUM)
1093 break;
1094 default:
1095 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1096 }
1097
1098 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1099 }
1100
1101 #ifdef CONFIG_COMPAT
1102 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1103 char __user *optval, int __user *optlen)
1104 {
1105 switch (level) {
1106 case SOL_RAW:
1107 break;
1108 case SOL_ICMPV6:
1109 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1110 return -EOPNOTSUPP;
1111 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1112 case SOL_IPV6:
1113 if (optname == IPV6_CHECKSUM)
1114 break;
1115 default:
1116 return compat_ipv6_getsockopt(sk, level, optname,
1117 optval, optlen);
1118 }
1119 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1120 }
1121 #endif
1122
1123 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1124 {
1125 switch (cmd) {
1126 case SIOCOUTQ: {
1127 int amount = sk_wmem_alloc_get(sk);
1128
1129 return put_user(amount, (int __user *)arg);
1130 }
1131 case SIOCINQ: {
1132 struct sk_buff *skb;
1133 int amount = 0;
1134
1135 spin_lock_bh(&sk->sk_receive_queue.lock);
1136 skb = skb_peek(&sk->sk_receive_queue);
1137 if (skb)
1138 amount = skb_tail_pointer(skb) -
1139 skb_transport_header(skb);
1140 spin_unlock_bh(&sk->sk_receive_queue.lock);
1141 return put_user(amount, (int __user *)arg);
1142 }
1143
1144 default:
1145 #ifdef CONFIG_IPV6_MROUTE
1146 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1147 #else
1148 return -ENOIOCTLCMD;
1149 #endif
1150 }
1151 }
1152
1153 #ifdef CONFIG_COMPAT
1154 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1155 {
1156 switch (cmd) {
1157 case SIOCOUTQ:
1158 case SIOCINQ:
1159 return -ENOIOCTLCMD;
1160 default:
1161 #ifdef CONFIG_IPV6_MROUTE
1162 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1163 #else
1164 return -ENOIOCTLCMD;
1165 #endif
1166 }
1167 }
1168 #endif
1169
1170 static void rawv6_close(struct sock *sk, long timeout)
1171 {
1172 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1173 ip6_ra_control(sk, -1);
1174 ip6mr_sk_done(sk);
1175 sk_common_release(sk);
1176 }
1177
1178 static void raw6_destroy(struct sock *sk)
1179 {
1180 lock_sock(sk);
1181 ip6_flush_pending_frames(sk);
1182 release_sock(sk);
1183
1184 inet6_destroy_sock(sk);
1185 }
1186
1187 static int rawv6_init_sk(struct sock *sk)
1188 {
1189 struct raw6_sock *rp = raw6_sk(sk);
1190
1191 switch (inet_sk(sk)->inet_num) {
1192 case IPPROTO_ICMPV6:
1193 rp->checksum = 1;
1194 rp->offset = 2;
1195 break;
1196 case IPPROTO_MH:
1197 rp->checksum = 1;
1198 rp->offset = 4;
1199 break;
1200 default:
1201 break;
1202 }
1203 return 0;
1204 }
1205
1206 struct proto rawv6_prot = {
1207 .name = "RAWv6",
1208 .owner = THIS_MODULE,
1209 .close = rawv6_close,
1210 .destroy = raw6_destroy,
1211 .connect = ip6_datagram_connect_v6_only,
1212 .disconnect = udp_disconnect,
1213 .ioctl = rawv6_ioctl,
1214 .init = rawv6_init_sk,
1215 .setsockopt = rawv6_setsockopt,
1216 .getsockopt = rawv6_getsockopt,
1217 .sendmsg = rawv6_sendmsg,
1218 .recvmsg = rawv6_recvmsg,
1219 .bind = rawv6_bind,
1220 .backlog_rcv = rawv6_rcv_skb,
1221 .hash = raw_hash_sk,
1222 .unhash = raw_unhash_sk,
1223 .obj_size = sizeof(struct raw6_sock),
1224 .h.raw_hash = &raw_v6_hashinfo,
1225 #ifdef CONFIG_COMPAT
1226 .compat_setsockopt = compat_rawv6_setsockopt,
1227 .compat_getsockopt = compat_rawv6_getsockopt,
1228 .compat_ioctl = compat_rawv6_ioctl,
1229 #endif
1230 };
1231
1232 #ifdef CONFIG_PROC_FS
1233 static int raw6_seq_show(struct seq_file *seq, void *v)
1234 {
1235 if (v == SEQ_START_TOKEN) {
1236 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1237 } else {
1238 struct sock *sp = v;
1239 __u16 srcp = inet_sk(sp)->inet_num;
1240 ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1241 raw_seq_private(seq)->bucket);
1242 }
1243 return 0;
1244 }
1245
1246 static const struct seq_operations raw6_seq_ops = {
1247 .start = raw_seq_start,
1248 .next = raw_seq_next,
1249 .stop = raw_seq_stop,
1250 .show = raw6_seq_show,
1251 };
1252
1253 static int raw6_seq_open(struct inode *inode, struct file *file)
1254 {
1255 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1256 }
1257
1258 static const struct file_operations raw6_seq_fops = {
1259 .owner = THIS_MODULE,
1260 .open = raw6_seq_open,
1261 .read = seq_read,
1262 .llseek = seq_lseek,
1263 .release = seq_release_net,
1264 };
1265
1266 static int __net_init raw6_init_net(struct net *net)
1267 {
1268 if (!proc_create("raw6", S_IRUGO, net->proc_net, &raw6_seq_fops))
1269 return -ENOMEM;
1270
1271 return 0;
1272 }
1273
1274 static void __net_exit raw6_exit_net(struct net *net)
1275 {
1276 remove_proc_entry("raw6", net->proc_net);
1277 }
1278
1279 static struct pernet_operations raw6_net_ops = {
1280 .init = raw6_init_net,
1281 .exit = raw6_exit_net,
1282 };
1283
1284 int __init raw6_proc_init(void)
1285 {
1286 return register_pernet_subsys(&raw6_net_ops);
1287 }
1288
1289 void raw6_proc_exit(void)
1290 {
1291 unregister_pernet_subsys(&raw6_net_ops);
1292 }
1293 #endif /* CONFIG_PROC_FS */
1294
1295 /* Same as inet6_dgram_ops, sans udp_poll. */
1296 static const struct proto_ops inet6_sockraw_ops = {
1297 .family = PF_INET6,
1298 .owner = THIS_MODULE,
1299 .release = inet6_release,
1300 .bind = inet6_bind,
1301 .connect = inet_dgram_connect, /* ok */
1302 .socketpair = sock_no_socketpair, /* a do nothing */
1303 .accept = sock_no_accept, /* a do nothing */
1304 .getname = inet6_getname,
1305 .poll = datagram_poll, /* ok */
1306 .ioctl = inet6_ioctl, /* must change */
1307 .listen = sock_no_listen, /* ok */
1308 .shutdown = inet_shutdown, /* ok */
1309 .setsockopt = sock_common_setsockopt, /* ok */
1310 .getsockopt = sock_common_getsockopt, /* ok */
1311 .sendmsg = inet_sendmsg, /* ok */
1312 .recvmsg = sock_common_recvmsg, /* ok */
1313 .mmap = sock_no_mmap,
1314 .sendpage = sock_no_sendpage,
1315 #ifdef CONFIG_COMPAT
1316 .compat_setsockopt = compat_sock_common_setsockopt,
1317 .compat_getsockopt = compat_sock_common_getsockopt,
1318 #endif
1319 };
1320
1321 static struct inet_protosw rawv6_protosw = {
1322 .type = SOCK_RAW,
1323 .protocol = IPPROTO_IP, /* wild card */
1324 .prot = &rawv6_prot,
1325 .ops = &inet6_sockraw_ops,
1326 .flags = INET_PROTOSW_REUSE,
1327 };
1328
1329 int __init rawv6_init(void)
1330 {
1331 int ret;
1332
1333 ret = inet6_register_protosw(&rawv6_protosw);
1334 if (ret)
1335 goto out;
1336 out:
1337 return ret;
1338 }
1339
1340 void rawv6_exit(void)
1341 {
1342 inet6_unregister_protosw(&rawv6_protosw);
1343 }
Linux with added FPC-III support