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[deliverable/linux.git] / net / ipv6 / raw.c
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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
68static struct raw_hashinfo raw_v6_hashinfo = {
69 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
70};
71
72static 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;
102found:
103 return sk;
104}
105
106/*
107 * 0 - deliver
108 * 1 - block
109 */
110static 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)
130typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
131
132static mh_filter_t __rcu *mh_filter __read_mostly;
133
134int rawv6_mh_filter_register(mh_filter_t filter)
135{
136 rcu_assign_pointer(mh_filter, filter);
137 return 0;
138}
139EXPORT_SYMBOL(rawv6_mh_filter_register);
140
141int rawv6_mh_filter_unregister(mh_filter_t filter)
142{
143 RCU_INIT_POINTER(mh_filter, NULL);
144 synchronize_rcu();
145 return 0;
146}
147EXPORT_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 */
158static 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 }
225out:
226 read_unlock(&raw_v6_hashinfo.lock);
227 return delivered;
228}
229
230bool 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 */
242static 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;
312out_unlock:
313 rcu_read_unlock();
314out:
315 release_sock(sk);
316 return err;
317}
318
319static 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
358void 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
387static 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 */
413int 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
459static 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_iovec(skb, 0, msg->msg_iov, 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_iovec(skb, 0, msg->msg_iov, copied);
494 } else {
495 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
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
522out_free:
523 skb_free_datagram(sk, skb);
524out:
525 return err;
526
527csum_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
537static 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 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
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
605send:
606 err = ip6_push_pending_frames(sk);
607out:
608 return err;
609}
610
611static int rawv6_send_hdrinc(struct sock *sk, void *from, 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 == NULL)
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_fromiovecend((void *)iph, from, 0, 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, skb, NULL,
656 rt->dst.dev, dst_output);
657 if (err > 0)
658 err = net_xmit_errno(err);
659 if (err)
660 goto error;
661out:
662 return 0;
663
664error_fault:
665 err = -EFAULT;
666 kfree_skb(skb);
667error:
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
674static int rawv6_probe_proto_opt(struct flowi6 *fl6, struct msghdr *msg)
675{
676 struct iovec *iov;
677 u8 __user *type = NULL;
678 u8 __user *code = NULL;
679 u8 len = 0;
680 int probed = 0;
681 int i;
682
683 if (!msg->msg_iov)
684 return 0;
685
686 for (i = 0; i < msg->msg_iovlen; i++) {
687 iov = &msg->msg_iov[i];
688 if (!iov)
689 continue;
690
691 switch (fl6->flowi6_proto) {
692 case IPPROTO_ICMPV6:
693 /* check if one-byte field is readable or not. */
694 if (iov->iov_base && iov->iov_len < 1)
695 break;
696
697 if (!type) {
698 type = iov->iov_base;
699 /* check if code field is readable or not. */
700 if (iov->iov_len > 1)
701 code = type + 1;
702 } else if (!code)
703 code = iov->iov_base;
704
705 if (type && code) {
706 if (get_user(fl6->fl6_icmp_type, type) ||
707 get_user(fl6->fl6_icmp_code, code))
708 return -EFAULT;
709 probed = 1;
710 }
711 break;
712 case IPPROTO_MH:
713 if (iov->iov_base && iov->iov_len < 1)
714 break;
715 /* check if type field is readable or not. */
716 if (iov->iov_len > 2 - len) {
717 u8 __user *p = iov->iov_base;
718 if (get_user(fl6->fl6_mh_type, &p[2 - len]))
719 return -EFAULT;
720 probed = 1;
721 } else
722 len += iov->iov_len;
723
724 break;
725 default:
726 probed = 1;
727 break;
728 }
729 if (probed)
730 break;
731 }
732 return 0;
733}
734
735static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
736 struct msghdr *msg, size_t len)
737{
738 struct ipv6_txoptions opt_space;
739 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
740 struct in6_addr *daddr, *final_p, final;
741 struct inet_sock *inet = inet_sk(sk);
742 struct ipv6_pinfo *np = inet6_sk(sk);
743 struct raw6_sock *rp = raw6_sk(sk);
744 struct ipv6_txoptions *opt = NULL;
745 struct ip6_flowlabel *flowlabel = NULL;
746 struct dst_entry *dst = NULL;
747 struct flowi6 fl6;
748 int addr_len = msg->msg_namelen;
749 int hlimit = -1;
750 int tclass = -1;
751 int dontfrag = -1;
752 u16 proto;
753 int err;
754
755 /* Rough check on arithmetic overflow,
756 better check is made in ip6_append_data().
757 */
758 if (len > INT_MAX)
759 return -EMSGSIZE;
760
761 /* Mirror BSD error message compatibility */
762 if (msg->msg_flags & MSG_OOB)
763 return -EOPNOTSUPP;
764
765 /*
766 * Get and verify the address.
767 */
768 memset(&fl6, 0, sizeof(fl6));
769
770 fl6.flowi6_mark = sk->sk_mark;
771
772 if (sin6) {
773 if (addr_len < SIN6_LEN_RFC2133)
774 return -EINVAL;
775
776 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
777 return -EAFNOSUPPORT;
778
779 /* port is the proto value [0..255] carried in nexthdr */
780 proto = ntohs(sin6->sin6_port);
781
782 if (!proto)
783 proto = inet->inet_num;
784 else if (proto != inet->inet_num)
785 return -EINVAL;
786
787 if (proto > 255)
788 return -EINVAL;
789
790 daddr = &sin6->sin6_addr;
791 if (np->sndflow) {
792 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
793 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
794 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
795 if (flowlabel == NULL)
796 return -EINVAL;
797 }
798 }
799
800 /*
801 * Otherwise it will be difficult to maintain
802 * sk->sk_dst_cache.
803 */
804 if (sk->sk_state == TCP_ESTABLISHED &&
805 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
806 daddr = &sk->sk_v6_daddr;
807
808 if (addr_len >= sizeof(struct sockaddr_in6) &&
809 sin6->sin6_scope_id &&
810 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
811 fl6.flowi6_oif = sin6->sin6_scope_id;
812 } else {
813 if (sk->sk_state != TCP_ESTABLISHED)
814 return -EDESTADDRREQ;
815
816 proto = inet->inet_num;
817 daddr = &sk->sk_v6_daddr;
818 fl6.flowlabel = np->flow_label;
819 }
820
821 if (fl6.flowi6_oif == 0)
822 fl6.flowi6_oif = sk->sk_bound_dev_if;
823
824 if (msg->msg_controllen) {
825 opt = &opt_space;
826 memset(opt, 0, sizeof(struct ipv6_txoptions));
827 opt->tot_len = sizeof(struct ipv6_txoptions);
828
829 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
830 &hlimit, &tclass, &dontfrag);
831 if (err < 0) {
832 fl6_sock_release(flowlabel);
833 return err;
834 }
835 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
836 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
837 if (flowlabel == NULL)
838 return -EINVAL;
839 }
840 if (!(opt->opt_nflen|opt->opt_flen))
841 opt = NULL;
842 }
843 if (opt == NULL)
844 opt = np->opt;
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 err = rawv6_probe_proto_opt(&fl6, msg);
851 if (err)
852 goto out;
853
854 if (!ipv6_addr_any(daddr))
855 fl6.daddr = *daddr;
856 else
857 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
858 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
859 fl6.saddr = np->saddr;
860
861 final_p = fl6_update_dst(&fl6, opt, &final);
862
863 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
864 fl6.flowi6_oif = np->mcast_oif;
865 else if (!fl6.flowi6_oif)
866 fl6.flowi6_oif = np->ucast_oif;
867 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
868
869 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
870 if (IS_ERR(dst)) {
871 err = PTR_ERR(dst);
872 goto out;
873 }
874 if (hlimit < 0)
875 hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
876
877 if (tclass < 0)
878 tclass = np->tclass;
879
880 if (dontfrag < 0)
881 dontfrag = np->dontfrag;
882
883 if (msg->msg_flags&MSG_CONFIRM)
884 goto do_confirm;
885
886back_from_confirm:
887 if (inet->hdrincl)
888 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl6, &dst, msg->msg_flags);
889 else {
890 lock_sock(sk);
891 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
892 len, 0, hlimit, tclass, opt, &fl6, (struct rt6_info *)dst,
893 msg->msg_flags, dontfrag);
894
895 if (err)
896 ip6_flush_pending_frames(sk);
897 else if (!(msg->msg_flags & MSG_MORE))
898 err = rawv6_push_pending_frames(sk, &fl6, rp);
899 release_sock(sk);
900 }
901done:
902 dst_release(dst);
903out:
904 fl6_sock_release(flowlabel);
905 return err < 0 ? err : len;
906do_confirm:
907 dst_confirm(dst);
908 if (!(msg->msg_flags & MSG_PROBE) || len)
909 goto back_from_confirm;
910 err = 0;
911 goto done;
912}
913
914static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
915 char __user *optval, int optlen)
916{
917 switch (optname) {
918 case ICMPV6_FILTER:
919 if (optlen > sizeof(struct icmp6_filter))
920 optlen = sizeof(struct icmp6_filter);
921 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
922 return -EFAULT;
923 return 0;
924 default:
925 return -ENOPROTOOPT;
926 }
927
928 return 0;
929}
930
931static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
932 char __user *optval, int __user *optlen)
933{
934 int len;
935
936 switch (optname) {
937 case ICMPV6_FILTER:
938 if (get_user(len, optlen))
939 return -EFAULT;
940 if (len < 0)
941 return -EINVAL;
942 if (len > sizeof(struct icmp6_filter))
943 len = sizeof(struct icmp6_filter);
944 if (put_user(len, optlen))
945 return -EFAULT;
946 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
947 return -EFAULT;
948 return 0;
949 default:
950 return -ENOPROTOOPT;
951 }
952
953 return 0;
954}
955
956
957static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
958 char __user *optval, unsigned int optlen)
959{
960 struct raw6_sock *rp = raw6_sk(sk);
961 int val;
962
963 if (get_user(val, (int __user *)optval))
964 return -EFAULT;
965
966 switch (optname) {
967 case IPV6_CHECKSUM:
968 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
969 level == IPPROTO_IPV6) {
970 /*
971 * RFC3542 tells that IPV6_CHECKSUM socket
972 * option in the IPPROTO_IPV6 level is not
973 * allowed on ICMPv6 sockets.
974 * If you want to set it, use IPPROTO_RAW
975 * level IPV6_CHECKSUM socket option
976 * (Linux extension).
977 */
978 return -EINVAL;
979 }
980
981 /* You may get strange result with a positive odd offset;
982 RFC2292bis agrees with me. */
983 if (val > 0 && (val&1))
984 return -EINVAL;
985 if (val < 0) {
986 rp->checksum = 0;
987 } else {
988 rp->checksum = 1;
989 rp->offset = val;
990 }
991
992 return 0;
993
994 default:
995 return -ENOPROTOOPT;
996 }
997}
998
999static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1000 char __user *optval, unsigned int optlen)
1001{
1002 switch (level) {
1003 case SOL_RAW:
1004 break;
1005
1006 case SOL_ICMPV6:
1007 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1008 return -EOPNOTSUPP;
1009 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1010 case SOL_IPV6:
1011 if (optname == IPV6_CHECKSUM)
1012 break;
1013 default:
1014 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1015 }
1016
1017 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1018}
1019
1020#ifdef CONFIG_COMPAT
1021static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1022 char __user *optval, unsigned int optlen)
1023{
1024 switch (level) {
1025 case SOL_RAW:
1026 break;
1027 case SOL_ICMPV6:
1028 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1029 return -EOPNOTSUPP;
1030 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1031 case SOL_IPV6:
1032 if (optname == IPV6_CHECKSUM)
1033 break;
1034 default:
1035 return compat_ipv6_setsockopt(sk, level, optname,
1036 optval, optlen);
1037 }
1038 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1039}
1040#endif
1041
1042static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1043 char __user *optval, int __user *optlen)
1044{
1045 struct raw6_sock *rp = raw6_sk(sk);
1046 int val, len;
1047
1048 if (get_user(len, optlen))
1049 return -EFAULT;
1050
1051 switch (optname) {
1052 case IPV6_CHECKSUM:
1053 /*
1054 * We allow getsockopt() for IPPROTO_IPV6-level
1055 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1056 * since RFC3542 is silent about it.
1057 */
1058 if (rp->checksum == 0)
1059 val = -1;
1060 else
1061 val = rp->offset;
1062 break;
1063
1064 default:
1065 return -ENOPROTOOPT;
1066 }
1067
1068 len = min_t(unsigned int, sizeof(int), len);
1069
1070 if (put_user(len, optlen))
1071 return -EFAULT;
1072 if (copy_to_user(optval, &val, len))
1073 return -EFAULT;
1074 return 0;
1075}
1076
1077static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1078 char __user *optval, int __user *optlen)
1079{
1080 switch (level) {
1081 case SOL_RAW:
1082 break;
1083
1084 case SOL_ICMPV6:
1085 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1086 return -EOPNOTSUPP;
1087 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1088 case SOL_IPV6:
1089 if (optname == IPV6_CHECKSUM)
1090 break;
1091 default:
1092 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1093 }
1094
1095 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1096}
1097
1098#ifdef CONFIG_COMPAT
1099static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1100 char __user *optval, int __user *optlen)
1101{
1102 switch (level) {
1103 case SOL_RAW:
1104 break;
1105 case SOL_ICMPV6:
1106 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1107 return -EOPNOTSUPP;
1108 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1109 case SOL_IPV6:
1110 if (optname == IPV6_CHECKSUM)
1111 break;
1112 default:
1113 return compat_ipv6_getsockopt(sk, level, optname,
1114 optval, optlen);
1115 }
1116 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1117}
1118#endif
1119
1120static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1121{
1122 switch (cmd) {
1123 case SIOCOUTQ: {
1124 int amount = sk_wmem_alloc_get(sk);
1125
1126 return put_user(amount, (int __user *)arg);
1127 }
1128 case SIOCINQ: {
1129 struct sk_buff *skb;
1130 int amount = 0;
1131
1132 spin_lock_bh(&sk->sk_receive_queue.lock);
1133 skb = skb_peek(&sk->sk_receive_queue);
1134 if (skb != NULL)
1135 amount = skb_tail_pointer(skb) -
1136 skb_transport_header(skb);
1137 spin_unlock_bh(&sk->sk_receive_queue.lock);
1138 return put_user(amount, (int __user *)arg);
1139 }
1140
1141 default:
1142#ifdef CONFIG_IPV6_MROUTE
1143 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1144#else
1145 return -ENOIOCTLCMD;
1146#endif
1147 }
1148}
1149
1150#ifdef CONFIG_COMPAT
1151static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1152{
1153 switch (cmd) {
1154 case SIOCOUTQ:
1155 case SIOCINQ:
1156 return -ENOIOCTLCMD;
1157 default:
1158#ifdef CONFIG_IPV6_MROUTE
1159 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1160#else
1161 return -ENOIOCTLCMD;
1162#endif
1163 }
1164}
1165#endif
1166
1167static void rawv6_close(struct sock *sk, long timeout)
1168{
1169 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1170 ip6_ra_control(sk, -1);
1171 ip6mr_sk_done(sk);
1172 sk_common_release(sk);
1173}
1174
1175static void raw6_destroy(struct sock *sk)
1176{
1177 lock_sock(sk);
1178 ip6_flush_pending_frames(sk);
1179 release_sock(sk);
1180
1181 inet6_destroy_sock(sk);
1182}
1183
1184static int rawv6_init_sk(struct sock *sk)
1185{
1186 struct raw6_sock *rp = raw6_sk(sk);
1187
1188 switch (inet_sk(sk)->inet_num) {
1189 case IPPROTO_ICMPV6:
1190 rp->checksum = 1;
1191 rp->offset = 2;
1192 break;
1193 case IPPROTO_MH:
1194 rp->checksum = 1;
1195 rp->offset = 4;
1196 break;
1197 default:
1198 break;
1199 }
1200 return 0;
1201}
1202
1203struct proto rawv6_prot = {
1204 .name = "RAWv6",
1205 .owner = THIS_MODULE,
1206 .close = rawv6_close,
1207 .destroy = raw6_destroy,
1208 .connect = ip6_datagram_connect_v6_only,
1209 .disconnect = udp_disconnect,
1210 .ioctl = rawv6_ioctl,
1211 .init = rawv6_init_sk,
1212 .setsockopt = rawv6_setsockopt,
1213 .getsockopt = rawv6_getsockopt,
1214 .sendmsg = rawv6_sendmsg,
1215 .recvmsg = rawv6_recvmsg,
1216 .bind = rawv6_bind,
1217 .backlog_rcv = rawv6_rcv_skb,
1218 .hash = raw_hash_sk,
1219 .unhash = raw_unhash_sk,
1220 .obj_size = sizeof(struct raw6_sock),
1221 .h.raw_hash = &raw_v6_hashinfo,
1222#ifdef CONFIG_COMPAT
1223 .compat_setsockopt = compat_rawv6_setsockopt,
1224 .compat_getsockopt = compat_rawv6_getsockopt,
1225 .compat_ioctl = compat_rawv6_ioctl,
1226#endif
1227};
1228
1229#ifdef CONFIG_PROC_FS
1230static int raw6_seq_show(struct seq_file *seq, void *v)
1231{
1232 if (v == SEQ_START_TOKEN) {
1233 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1234 } else {
1235 struct sock *sp = v;
1236 __u16 srcp = inet_sk(sp)->inet_num;
1237 ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1238 raw_seq_private(seq)->bucket);
1239 }
1240 return 0;
1241}
1242
1243static const struct seq_operations raw6_seq_ops = {
1244 .start = raw_seq_start,
1245 .next = raw_seq_next,
1246 .stop = raw_seq_stop,
1247 .show = raw6_seq_show,
1248};
1249
1250static int raw6_seq_open(struct inode *inode, struct file *file)
1251{
1252 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1253}
1254
1255static const struct file_operations raw6_seq_fops = {
1256 .owner = THIS_MODULE,
1257 .open = raw6_seq_open,
1258 .read = seq_read,
1259 .llseek = seq_lseek,
1260 .release = seq_release_net,
1261};
1262
1263static int __net_init raw6_init_net(struct net *net)
1264{
1265 if (!proc_create("raw6", S_IRUGO, net->proc_net, &raw6_seq_fops))
1266 return -ENOMEM;
1267
1268 return 0;
1269}
1270
1271static void __net_exit raw6_exit_net(struct net *net)
1272{
1273 remove_proc_entry("raw6", net->proc_net);
1274}
1275
1276static struct pernet_operations raw6_net_ops = {
1277 .init = raw6_init_net,
1278 .exit = raw6_exit_net,
1279};
1280
1281int __init raw6_proc_init(void)
1282{
1283 return register_pernet_subsys(&raw6_net_ops);
1284}
1285
1286void raw6_proc_exit(void)
1287{
1288 unregister_pernet_subsys(&raw6_net_ops);
1289}
1290#endif /* CONFIG_PROC_FS */
1291
1292/* Same as inet6_dgram_ops, sans udp_poll. */
1293static const struct proto_ops inet6_sockraw_ops = {
1294 .family = PF_INET6,
1295 .owner = THIS_MODULE,
1296 .release = inet6_release,
1297 .bind = inet6_bind,
1298 .connect = inet_dgram_connect, /* ok */
1299 .socketpair = sock_no_socketpair, /* a do nothing */
1300 .accept = sock_no_accept, /* a do nothing */
1301 .getname = inet6_getname,
1302 .poll = datagram_poll, /* ok */
1303 .ioctl = inet6_ioctl, /* must change */
1304 .listen = sock_no_listen, /* ok */
1305 .shutdown = inet_shutdown, /* ok */
1306 .setsockopt = sock_common_setsockopt, /* ok */
1307 .getsockopt = sock_common_getsockopt, /* ok */
1308 .sendmsg = inet_sendmsg, /* ok */
1309 .recvmsg = sock_common_recvmsg, /* ok */
1310 .mmap = sock_no_mmap,
1311 .sendpage = sock_no_sendpage,
1312#ifdef CONFIG_COMPAT
1313 .compat_setsockopt = compat_sock_common_setsockopt,
1314 .compat_getsockopt = compat_sock_common_getsockopt,
1315#endif
1316};
1317
1318static struct inet_protosw rawv6_protosw = {
1319 .type = SOCK_RAW,
1320 .protocol = IPPROTO_IP, /* wild card */
1321 .prot = &rawv6_prot,
1322 .ops = &inet6_sockraw_ops,
1323 .flags = INET_PROTOSW_REUSE,
1324};
1325
1326int __init rawv6_init(void)
1327{
1328 int ret;
1329
1330 ret = inet6_register_protosw(&rawv6_protosw);
1331 if (ret)
1332 goto out;
1333out:
1334 return ret;
1335}
1336
1337void rawv6_exit(void)
1338{
1339 inet6_unregister_protosw(&rawv6_protosw);
1340}
Linux kernel - Deliverables
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