]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - net/ipv6/raw.c
projects / mirror_ubuntu-zesty-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
[mirror_ubuntu-zesty-kernel.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 <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 struct raw_hashinfo raw_v6_hashinfo = {
69 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
70 };
71 EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
72
73 struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
74 unsigned short num, const struct in6_addr *loc_addr,
75 const struct in6_addr *rmt_addr, int dif)
76 {
77 bool is_multicast = ipv6_addr_is_multicast(loc_addr);
78
79 sk_for_each_from(sk)
80 if (inet_sk(sk)->inet_num == num) {
81
82 if (!net_eq(sock_net(sk), net))
83 continue;
84
85 if (!ipv6_addr_any(&sk->sk_v6_daddr) &&
86 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr))
87 continue;
88
89 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
90 continue;
91
92 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
93 if (ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))
94 goto found;
95 if (is_multicast &&
96 inet6_mc_check(sk, loc_addr, rmt_addr))
97 goto found;
98 continue;
99 }
100 goto found;
101 }
102 sk = NULL;
103 found:
104 return sk;
105 }
106 EXPORT_SYMBOL_GPL(__raw_v6_lookup);
107
108 /*
109 * 0 - deliver
110 * 1 - block
111 */
112 static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
113 {
114 struct icmp6hdr _hdr;
115 const struct icmp6hdr *hdr;
116
117 /* We require only the four bytes of the ICMPv6 header, not any
118 * additional bytes of message body in "struct icmp6hdr".
119 */
120 hdr = skb_header_pointer(skb, skb_transport_offset(skb),
121 ICMPV6_HDRLEN, &_hdr);
122 if (hdr) {
123 const __u32 *data = &raw6_sk(sk)->filter.data[0];
124 unsigned int type = hdr->icmp6_type;
125
126 return (data[type >> 5] & (1U << (type & 31))) != 0;
127 }
128 return 1;
129 }
130
131 #if IS_ENABLED(CONFIG_IPV6_MIP6)
132 typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
133
134 static mh_filter_t __rcu *mh_filter __read_mostly;
135
136 int rawv6_mh_filter_register(mh_filter_t filter)
137 {
138 rcu_assign_pointer(mh_filter, filter);
139 return 0;
140 }
141 EXPORT_SYMBOL(rawv6_mh_filter_register);
142
143 int rawv6_mh_filter_unregister(mh_filter_t filter)
144 {
145 RCU_INIT_POINTER(mh_filter, NULL);
146 synchronize_rcu();
147 return 0;
148 }
149 EXPORT_SYMBOL(rawv6_mh_filter_unregister);
150
151 #endif
152
153 /*
154 * demultiplex raw sockets.
155 * (should consider queueing the skb in the sock receive_queue
156 * without calling rawv6.c)
157 *
158 * Caller owns SKB so we must make clones.
159 */
160 static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
161 {
162 const struct in6_addr *saddr;
163 const struct in6_addr *daddr;
164 struct sock *sk;
165 bool delivered = false;
166 __u8 hash;
167 struct net *net;
168
169 saddr = &ipv6_hdr(skb)->saddr;
170 daddr = saddr + 1;
171
172 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
173
174 read_lock(&raw_v6_hashinfo.lock);
175 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
176
177 if (!sk)
178 goto out;
179
180 net = dev_net(skb->dev);
181 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, inet6_iif(skb));
182
183 while (sk) {
184 int filtered;
185
186 delivered = true;
187 switch (nexthdr) {
188 case IPPROTO_ICMPV6:
189 filtered = icmpv6_filter(sk, skb);
190 break;
191
192 #if IS_ENABLED(CONFIG_IPV6_MIP6)
193 case IPPROTO_MH:
194 {
195 /* XXX: To validate MH only once for each packet,
196 * this is placed here. It should be after checking
197 * xfrm policy, however it doesn't. The checking xfrm
198 * policy is placed in rawv6_rcv() because it is
199 * required for each socket.
200 */
201 mh_filter_t *filter;
202
203 filter = rcu_dereference(mh_filter);
204 filtered = filter ? (*filter)(sk, skb) : 0;
205 break;
206 }
207 #endif
208 default:
209 filtered = 0;
210 break;
211 }
212
213 if (filtered < 0)
214 break;
215 if (filtered == 0) {
216 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
217
218 /* Not releasing hash table! */
219 if (clone) {
220 nf_reset(clone);
221 rawv6_rcv(sk, clone);
222 }
223 }
224 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
225 inet6_iif(skb));
226 }
227 out:
228 read_unlock(&raw_v6_hashinfo.lock);
229 return delivered;
230 }
231
232 bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
233 {
234 struct sock *raw_sk;
235
236 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]);
237 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
238 raw_sk = NULL;
239
240 return raw_sk != NULL;
241 }
242
243 /* This cleans up af_inet6 a bit. -DaveM */
244 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
245 {
246 struct inet_sock *inet = inet_sk(sk);
247 struct ipv6_pinfo *np = inet6_sk(sk);
248 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
249 __be32 v4addr = 0;
250 int addr_type;
251 int err;
252
253 if (addr_len < SIN6_LEN_RFC2133)
254 return -EINVAL;
255
256 if (addr->sin6_family != AF_INET6)
257 return -EINVAL;
258
259 addr_type = ipv6_addr_type(&addr->sin6_addr);
260
261 /* Raw sockets are IPv6 only */
262 if (addr_type == IPV6_ADDR_MAPPED)
263 return -EADDRNOTAVAIL;
264
265 lock_sock(sk);
266
267 err = -EINVAL;
268 if (sk->sk_state != TCP_CLOSE)
269 goto out;
270
271 rcu_read_lock();
272 /* Check if the address belongs to the host. */
273 if (addr_type != IPV6_ADDR_ANY) {
274 struct net_device *dev = NULL;
275
276 if (__ipv6_addr_needs_scope_id(addr_type)) {
277 if (addr_len >= sizeof(struct sockaddr_in6) &&
278 addr->sin6_scope_id) {
279 /* Override any existing binding, if another
280 * one is supplied by user.
281 */
282 sk->sk_bound_dev_if = addr->sin6_scope_id;
283 }
284
285 /* Binding to link-local address requires an interface */
286 if (!sk->sk_bound_dev_if)
287 goto out_unlock;
288
289 err = -ENODEV;
290 dev = dev_get_by_index_rcu(sock_net(sk),
291 sk->sk_bound_dev_if);
292 if (!dev)
293 goto out_unlock;
294 }
295
296 /* ipv4 addr of the socket is invalid. Only the
297 * unspecified and mapped address have a v4 equivalent.
298 */
299 v4addr = LOOPBACK4_IPV6;
300 if (!(addr_type & IPV6_ADDR_MULTICAST) &&
301 !sock_net(sk)->ipv6.sysctl.ip_nonlocal_bind) {
302 err = -EADDRNOTAVAIL;
303 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
304 dev, 0)) {
305 goto out_unlock;
306 }
307 }
308 }
309
310 inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
311 sk->sk_v6_rcv_saddr = addr->sin6_addr;
312 if (!(addr_type & IPV6_ADDR_MULTICAST))
313 np->saddr = addr->sin6_addr;
314 err = 0;
315 out_unlock:
316 rcu_read_unlock();
317 out:
318 release_sock(sk);
319 return err;
320 }
321
322 static void rawv6_err(struct sock *sk, struct sk_buff *skb,
323 struct inet6_skb_parm *opt,
324 u8 type, u8 code, int offset, __be32 info)
325 {
326 struct inet_sock *inet = inet_sk(sk);
327 struct ipv6_pinfo *np = inet6_sk(sk);
328 int err;
329 int harderr;
330
331 /* Report error on raw socket, if:
332 1. User requested recverr.
333 2. Socket is connected (otherwise the error indication
334 is useless without recverr and error is hard.
335 */
336 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
337 return;
338
339 harderr = icmpv6_err_convert(type, code, &err);
340 if (type == ICMPV6_PKT_TOOBIG) {
341 ip6_sk_update_pmtu(skb, sk, info);
342 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
343 }
344 if (type == NDISC_REDIRECT) {
345 ip6_sk_redirect(skb, sk);
346 return;
347 }
348 if (np->recverr) {
349 u8 *payload = skb->data;
350 if (!inet->hdrincl)
351 payload += offset;
352 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
353 }
354
355 if (np->recverr || harderr) {
356 sk->sk_err = err;
357 sk->sk_error_report(sk);
358 }
359 }
360
361 void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
362 u8 type, u8 code, int inner_offset, __be32 info)
363 {
364 struct sock *sk;
365 int hash;
366 const struct in6_addr *saddr, *daddr;
367 struct net *net;
368
369 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
370
371 read_lock(&raw_v6_hashinfo.lock);
372 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
373 if (sk) {
374 /* Note: ipv6_hdr(skb) != skb->data */
375 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
376 saddr = &ip6h->saddr;
377 daddr = &ip6h->daddr;
378 net = dev_net(skb->dev);
379
380 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
381 inet6_iif(skb)))) {
382 rawv6_err(sk, skb, NULL, type, code,
383 inner_offset, info);
384 sk = sk_next(sk);
385 }
386 }
387 read_unlock(&raw_v6_hashinfo.lock);
388 }
389
390 static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
391 {
392 if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
393 skb_checksum_complete(skb)) {
394 atomic_inc(&sk->sk_drops);
395 kfree_skb(skb);
396 return NET_RX_DROP;
397 }
398
399 /* Charge it to the socket. */
400 skb_dst_drop(skb);
401 if (sock_queue_rcv_skb(sk, skb) < 0) {
402 kfree_skb(skb);
403 return NET_RX_DROP;
404 }
405
406 return 0;
407 }
408
409 /*
410 * This is next to useless...
411 * if we demultiplex in network layer we don't need the extra call
412 * just to queue the skb...
413 * maybe we could have the network decide upon a hint if it
414 * should call raw_rcv for demultiplexing
415 */
416 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
417 {
418 struct inet_sock *inet = inet_sk(sk);
419 struct raw6_sock *rp = raw6_sk(sk);
420
421 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
422 atomic_inc(&sk->sk_drops);
423 kfree_skb(skb);
424 return NET_RX_DROP;
425 }
426
427 if (!rp->checksum)
428 skb->ip_summed = CHECKSUM_UNNECESSARY;
429
430 if (skb->ip_summed == CHECKSUM_COMPLETE) {
431 skb_postpull_rcsum(skb, skb_network_header(skb),
432 skb_network_header_len(skb));
433 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
434 &ipv6_hdr(skb)->daddr,
435 skb->len, inet->inet_num, skb->csum))
436 skb->ip_summed = CHECKSUM_UNNECESSARY;
437 }
438 if (!skb_csum_unnecessary(skb))
439 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
440 &ipv6_hdr(skb)->daddr,
441 skb->len,
442 inet->inet_num, 0));
443
444 if (inet->hdrincl) {
445 if (skb_checksum_complete(skb)) {
446 atomic_inc(&sk->sk_drops);
447 kfree_skb(skb);
448 return NET_RX_DROP;
449 }
450 }
451
452 rawv6_rcv_skb(sk, skb);
453 return 0;
454 }
455
456
457 /*
458 * This should be easy, if there is something there
459 * we return it, otherwise we block.
460 */
461
462 static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
463 int noblock, int flags, int *addr_len)
464 {
465 struct ipv6_pinfo *np = inet6_sk(sk);
466 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
467 struct sk_buff *skb;
468 size_t copied;
469 int err;
470
471 if (flags & MSG_OOB)
472 return -EOPNOTSUPP;
473
474 if (flags & MSG_ERRQUEUE)
475 return ipv6_recv_error(sk, msg, len, addr_len);
476
477 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
478 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
479
480 skb = skb_recv_datagram(sk, flags, noblock, &err);
481 if (!skb)
482 goto out;
483
484 copied = skb->len;
485 if (copied > len) {
486 copied = len;
487 msg->msg_flags |= MSG_TRUNC;
488 }
489
490 if (skb_csum_unnecessary(skb)) {
491 err = skb_copy_datagram_msg(skb, 0, msg, copied);
492 } else if (msg->msg_flags&MSG_TRUNC) {
493 if (__skb_checksum_complete(skb))
494 goto csum_copy_err;
495 err = skb_copy_datagram_msg(skb, 0, msg, copied);
496 } else {
497 err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
498 if (err == -EINVAL)
499 goto csum_copy_err;
500 }
501 if (err)
502 goto out_free;
503
504 /* Copy the address. */
505 if (sin6) {
506 sin6->sin6_family = AF_INET6;
507 sin6->sin6_port = 0;
508 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
509 sin6->sin6_flowinfo = 0;
510 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
511 inet6_iif(skb));
512 *addr_len = sizeof(*sin6);
513 }
514
515 sock_recv_ts_and_drops(msg, sk, skb);
516
517 if (np->rxopt.all)
518 ip6_datagram_recv_ctl(sk, msg, skb);
519
520 err = copied;
521 if (flags & MSG_TRUNC)
522 err = skb->len;
523
524 out_free:
525 skb_free_datagram(sk, skb);
526 out:
527 return err;
528
529 csum_copy_err:
530 skb_kill_datagram(sk, skb, flags);
531
532 /* Error for blocking case is chosen to masquerade
533 as some normal condition.
534 */
535 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
536 goto out;
537 }
538
539 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
540 struct raw6_sock *rp)
541 {
542 struct sk_buff *skb;
543 int err = 0;
544 int offset;
545 int len;
546 int total_len;
547 __wsum tmp_csum;
548 __sum16 csum;
549
550 if (!rp->checksum)
551 goto send;
552
553 skb = skb_peek(&sk->sk_write_queue);
554 if (!skb)
555 goto out;
556
557 offset = rp->offset;
558 total_len = inet_sk(sk)->cork.base.length;
559 if (offset >= total_len - 1) {
560 err = -EINVAL;
561 ip6_flush_pending_frames(sk);
562 goto out;
563 }
564
565 /* should be check HW csum miyazawa */
566 if (skb_queue_len(&sk->sk_write_queue) == 1) {
567 /*
568 * Only one fragment on the socket.
569 */
570 tmp_csum = skb->csum;
571 } else {
572 struct sk_buff *csum_skb = NULL;
573 tmp_csum = 0;
574
575 skb_queue_walk(&sk->sk_write_queue, skb) {
576 tmp_csum = csum_add(tmp_csum, skb->csum);
577
578 if (csum_skb)
579 continue;
580
581 len = skb->len - skb_transport_offset(skb);
582 if (offset >= len) {
583 offset -= len;
584 continue;
585 }
586
587 csum_skb = skb;
588 }
589
590 skb = csum_skb;
591 }
592
593 offset += skb_transport_offset(skb);
594 BUG_ON(skb_copy_bits(skb, offset, &csum, 2));
595
596 /* in case cksum was not initialized */
597 if (unlikely(csum))
598 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
599
600 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
601 total_len, fl6->flowi6_proto, tmp_csum);
602
603 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
604 csum = CSUM_MANGLED_0;
605
606 BUG_ON(skb_store_bits(skb, offset, &csum, 2));
607
608 send:
609 err = ip6_push_pending_frames(sk);
610 out:
611 return err;
612 }
613
614 static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
615 struct flowi6 *fl6, struct dst_entry **dstp,
616 unsigned int flags)
617 {
618 struct ipv6_pinfo *np = inet6_sk(sk);
619 struct net *net = sock_net(sk);
620 struct ipv6hdr *iph;
621 struct sk_buff *skb;
622 int err;
623 struct rt6_info *rt = (struct rt6_info *)*dstp;
624 int hlen = LL_RESERVED_SPACE(rt->dst.dev);
625 int tlen = rt->dst.dev->needed_tailroom;
626
627 if (length > rt->dst.dev->mtu) {
628 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
629 return -EMSGSIZE;
630 }
631 if (flags&MSG_PROBE)
632 goto out;
633
634 skb = sock_alloc_send_skb(sk,
635 length + hlen + tlen + 15,
636 flags & MSG_DONTWAIT, &err);
637 if (!skb)
638 goto error;
639 skb_reserve(skb, hlen);
640
641 skb->protocol = htons(ETH_P_IPV6);
642 skb->priority = sk->sk_priority;
643 skb->mark = sk->sk_mark;
644 skb_dst_set(skb, &rt->dst);
645 *dstp = NULL;
646
647 skb_put(skb, length);
648 skb_reset_network_header(skb);
649 iph = ipv6_hdr(skb);
650
651 skb->ip_summed = CHECKSUM_NONE;
652
653 skb->transport_header = skb->network_header;
654 err = memcpy_from_msg(iph, msg, length);
655 if (err)
656 goto error_fault;
657
658 /* if egress device is enslaved to an L3 master device pass the
659 * skb to its handler for processing
660 */
661 skb = l3mdev_ip6_out(sk, skb);
662 if (unlikely(!skb))
663 return 0;
664
665 IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
666 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
667 NULL, rt->dst.dev, dst_output);
668 if (err > 0)
669 err = net_xmit_errno(err);
670 if (err)
671 goto error;
672 out:
673 return 0;
674
675 error_fault:
676 err = -EFAULT;
677 kfree_skb(skb);
678 error:
679 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
680 if (err == -ENOBUFS && !np->recverr)
681 err = 0;
682 return err;
683 }
684
685 struct raw6_frag_vec {
686 struct msghdr *msg;
687 int hlen;
688 char c[4];
689 };
690
691 static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
692 {
693 int err = 0;
694 switch (fl6->flowi6_proto) {
695 case IPPROTO_ICMPV6:
696 rfv->hlen = 2;
697 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
698 if (!err) {
699 fl6->fl6_icmp_type = rfv->c[0];
700 fl6->fl6_icmp_code = rfv->c[1];
701 }
702 break;
703 case IPPROTO_MH:
704 rfv->hlen = 4;
705 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
706 if (!err)
707 fl6->fl6_mh_type = rfv->c[2];
708 }
709 return err;
710 }
711
712 static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
713 struct sk_buff *skb)
714 {
715 struct raw6_frag_vec *rfv = from;
716
717 if (offset < rfv->hlen) {
718 int copy = min(rfv->hlen - offset, len);
719
720 if (skb->ip_summed == CHECKSUM_PARTIAL)
721 memcpy(to, rfv->c + offset, copy);
722 else
723 skb->csum = csum_block_add(
724 skb->csum,
725 csum_partial_copy_nocheck(rfv->c + offset,
726 to, copy, 0),
727 odd);
728
729 odd = 0;
730 offset += copy;
731 to += copy;
732 len -= copy;
733
734 if (!len)
735 return 0;
736 }
737
738 offset -= rfv->hlen;
739
740 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
741 }
742
743 static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
744 {
745 struct ipv6_txoptions *opt_to_free = NULL;
746 struct ipv6_txoptions opt_space;
747 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
748 struct in6_addr *daddr, *final_p, final;
749 struct inet_sock *inet = inet_sk(sk);
750 struct ipv6_pinfo *np = inet6_sk(sk);
751 struct raw6_sock *rp = raw6_sk(sk);
752 struct ipv6_txoptions *opt = NULL;
753 struct ip6_flowlabel *flowlabel = NULL;
754 struct dst_entry *dst = NULL;
755 struct raw6_frag_vec rfv;
756 struct flowi6 fl6;
757 struct sockcm_cookie sockc;
758 struct ipcm6_cookie ipc6;
759 int addr_len = msg->msg_namelen;
760 u16 proto;
761 int err;
762
763 /* Rough check on arithmetic overflow,
764 better check is made in ip6_append_data().
765 */
766 if (len > INT_MAX)
767 return -EMSGSIZE;
768
769 /* Mirror BSD error message compatibility */
770 if (msg->msg_flags & MSG_OOB)
771 return -EOPNOTSUPP;
772
773 /*
774 * Get and verify the address.
775 */
776 memset(&fl6, 0, sizeof(fl6));
777
778 fl6.flowi6_mark = sk->sk_mark;
779 fl6.flowi6_uid = sk->sk_uid;
780
781 ipc6.hlimit = -1;
782 ipc6.tclass = -1;
783 ipc6.dontfrag = -1;
784 ipc6.opt = NULL;
785
786 if (sin6) {
787 if (addr_len < SIN6_LEN_RFC2133)
788 return -EINVAL;
789
790 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
791 return -EAFNOSUPPORT;
792
793 /* port is the proto value [0..255] carried in nexthdr */
794 proto = ntohs(sin6->sin6_port);
795
796 if (!proto)
797 proto = inet->inet_num;
798 else if (proto != inet->inet_num)
799 return -EINVAL;
800
801 if (proto > 255)
802 return -EINVAL;
803
804 daddr = &sin6->sin6_addr;
805 if (np->sndflow) {
806 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
807 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
808 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
809 if (!flowlabel)
810 return -EINVAL;
811 }
812 }
813
814 /*
815 * Otherwise it will be difficult to maintain
816 * sk->sk_dst_cache.
817 */
818 if (sk->sk_state == TCP_ESTABLISHED &&
819 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
820 daddr = &sk->sk_v6_daddr;
821
822 if (addr_len >= sizeof(struct sockaddr_in6) &&
823 sin6->sin6_scope_id &&
824 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
825 fl6.flowi6_oif = sin6->sin6_scope_id;
826 } else {
827 if (sk->sk_state != TCP_ESTABLISHED)
828 return -EDESTADDRREQ;
829
830 proto = inet->inet_num;
831 daddr = &sk->sk_v6_daddr;
832 fl6.flowlabel = np->flow_label;
833 }
834
835 if (fl6.flowi6_oif == 0)
836 fl6.flowi6_oif = sk->sk_bound_dev_if;
837
838 sockc.tsflags = sk->sk_tsflags;
839 if (msg->msg_controllen) {
840 opt = &opt_space;
841 memset(opt, 0, sizeof(struct ipv6_txoptions));
842 opt->tot_len = sizeof(struct ipv6_txoptions);
843 ipc6.opt = opt;
844
845 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc);
846 if (err < 0) {
847 fl6_sock_release(flowlabel);
848 return err;
849 }
850 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
851 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
852 if (!flowlabel)
853 return -EINVAL;
854 }
855 if (!(opt->opt_nflen|opt->opt_flen))
856 opt = NULL;
857 }
858 if (!opt) {
859 opt = txopt_get(np);
860 opt_to_free = opt;
861 }
862 if (flowlabel)
863 opt = fl6_merge_options(&opt_space, flowlabel, opt);
864 opt = ipv6_fixup_options(&opt_space, opt);
865
866 fl6.flowi6_proto = proto;
867 rfv.msg = msg;
868 rfv.hlen = 0;
869 err = rawv6_probe_proto_opt(&rfv, &fl6);
870 if (err)
871 goto out;
872
873 if (!ipv6_addr_any(daddr))
874 fl6.daddr = *daddr;
875 else
876 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
877 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
878 fl6.saddr = np->saddr;
879
880 final_p = fl6_update_dst(&fl6, opt, &final);
881
882 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
883 fl6.flowi6_oif = np->mcast_oif;
884 else if (!fl6.flowi6_oif)
885 fl6.flowi6_oif = np->ucast_oif;
886 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
887
888 if (inet->hdrincl)
889 fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH;
890
891 if (ipc6.tclass < 0)
892 ipc6.tclass = np->tclass;
893
894 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
895
896 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
897 if (IS_ERR(dst)) {
898 err = PTR_ERR(dst);
899 goto out;
900 }
901 if (ipc6.hlimit < 0)
902 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
903
904 if (ipc6.dontfrag < 0)
905 ipc6.dontfrag = np->dontfrag;
906
907 if (msg->msg_flags&MSG_CONFIRM)
908 goto do_confirm;
909
910 back_from_confirm:
911 if (inet->hdrincl)
912 err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst, msg->msg_flags);
913 else {
914 ipc6.opt = opt;
915 lock_sock(sk);
916 err = ip6_append_data(sk, raw6_getfrag, &rfv,
917 len, 0, &ipc6, &fl6, (struct rt6_info *)dst,
918 msg->msg_flags, &sockc);
919
920 if (err)
921 ip6_flush_pending_frames(sk);
922 else if (!(msg->msg_flags & MSG_MORE))
923 err = rawv6_push_pending_frames(sk, &fl6, rp);
924 release_sock(sk);
925 }
926 done:
927 dst_release(dst);
928 out:
929 fl6_sock_release(flowlabel);
930 txopt_put(opt_to_free);
931 return err < 0 ? err : len;
932 do_confirm:
933 dst_confirm(dst);
934 if (!(msg->msg_flags & MSG_PROBE) || len)
935 goto back_from_confirm;
936 err = 0;
937 goto done;
938 }
939
940 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
941 char __user *optval, int optlen)
942 {
943 switch (optname) {
944 case ICMPV6_FILTER:
945 if (optlen > sizeof(struct icmp6_filter))
946 optlen = sizeof(struct icmp6_filter);
947 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
948 return -EFAULT;
949 return 0;
950 default:
951 return -ENOPROTOOPT;
952 }
953
954 return 0;
955 }
956
957 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
958 char __user *optval, int __user *optlen)
959 {
960 int len;
961
962 switch (optname) {
963 case ICMPV6_FILTER:
964 if (get_user(len, optlen))
965 return -EFAULT;
966 if (len < 0)
967 return -EINVAL;
968 if (len > sizeof(struct icmp6_filter))
969 len = sizeof(struct icmp6_filter);
970 if (put_user(len, optlen))
971 return -EFAULT;
972 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
973 return -EFAULT;
974 return 0;
975 default:
976 return -ENOPROTOOPT;
977 }
978
979 return 0;
980 }
981
982
983 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
984 char __user *optval, unsigned int optlen)
985 {
986 struct raw6_sock *rp = raw6_sk(sk);
987 int val;
988
989 if (get_user(val, (int __user *)optval))
990 return -EFAULT;
991
992 switch (optname) {
993 case IPV6_HDRINCL:
994 if (sk->sk_type != SOCK_RAW)
995 return -EINVAL;
996 inet_sk(sk)->hdrincl = !!val;
997 return 0;
998 case IPV6_CHECKSUM:
999 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
1000 level == IPPROTO_IPV6) {
1001 /*
1002 * RFC3542 tells that IPV6_CHECKSUM socket
1003 * option in the IPPROTO_IPV6 level is not
1004 * allowed on ICMPv6 sockets.
1005 * If you want to set it, use IPPROTO_RAW
1006 * level IPV6_CHECKSUM socket option
1007 * (Linux extension).
1008 */
1009 return -EINVAL;
1010 }
1011
1012 /* You may get strange result with a positive odd offset;
1013 RFC2292bis agrees with me. */
1014 if (val > 0 && (val&1))
1015 return -EINVAL;
1016 if (val < 0) {
1017 rp->checksum = 0;
1018 } else {
1019 rp->checksum = 1;
1020 rp->offset = val;
1021 }
1022
1023 return 0;
1024
1025 default:
1026 return -ENOPROTOOPT;
1027 }
1028 }
1029
1030 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1031 char __user *optval, unsigned int optlen)
1032 {
1033 switch (level) {
1034 case SOL_RAW:
1035 break;
1036
1037 case SOL_ICMPV6:
1038 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1039 return -EOPNOTSUPP;
1040 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1041 case SOL_IPV6:
1042 if (optname == IPV6_CHECKSUM ||
1043 optname == IPV6_HDRINCL)
1044 break;
1045 default:
1046 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1047 }
1048
1049 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1050 }
1051
1052 #ifdef CONFIG_COMPAT
1053 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1054 char __user *optval, unsigned int optlen)
1055 {
1056 switch (level) {
1057 case SOL_RAW:
1058 break;
1059 case SOL_ICMPV6:
1060 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1061 return -EOPNOTSUPP;
1062 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1063 case SOL_IPV6:
1064 if (optname == IPV6_CHECKSUM ||
1065 optname == IPV6_HDRINCL)
1066 break;
1067 default:
1068 return compat_ipv6_setsockopt(sk, level, optname,
1069 optval, optlen);
1070 }
1071 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1072 }
1073 #endif
1074
1075 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1076 char __user *optval, int __user *optlen)
1077 {
1078 struct raw6_sock *rp = raw6_sk(sk);
1079 int val, len;
1080
1081 if (get_user(len, optlen))
1082 return -EFAULT;
1083
1084 switch (optname) {
1085 case IPV6_HDRINCL:
1086 val = inet_sk(sk)->hdrincl;
1087 break;
1088 case IPV6_CHECKSUM:
1089 /*
1090 * We allow getsockopt() for IPPROTO_IPV6-level
1091 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1092 * since RFC3542 is silent about it.
1093 */
1094 if (rp->checksum == 0)
1095 val = -1;
1096 else
1097 val = rp->offset;
1098 break;
1099
1100 default:
1101 return -ENOPROTOOPT;
1102 }
1103
1104 len = min_t(unsigned int, sizeof(int), len);
1105
1106 if (put_user(len, optlen))
1107 return -EFAULT;
1108 if (copy_to_user(optval, &val, len))
1109 return -EFAULT;
1110 return 0;
1111 }
1112
1113 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1114 char __user *optval, int __user *optlen)
1115 {
1116 switch (level) {
1117 case SOL_RAW:
1118 break;
1119
1120 case SOL_ICMPV6:
1121 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1122 return -EOPNOTSUPP;
1123 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1124 case SOL_IPV6:
1125 if (optname == IPV6_CHECKSUM ||
1126 optname == IPV6_HDRINCL)
1127 break;
1128 default:
1129 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1130 }
1131
1132 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1133 }
1134
1135 #ifdef CONFIG_COMPAT
1136 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1137 char __user *optval, int __user *optlen)
1138 {
1139 switch (level) {
1140 case SOL_RAW:
1141 break;
1142 case SOL_ICMPV6:
1143 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1144 return -EOPNOTSUPP;
1145 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1146 case SOL_IPV6:
1147 if (optname == IPV6_CHECKSUM ||
1148 optname == IPV6_HDRINCL)
1149 break;
1150 default:
1151 return compat_ipv6_getsockopt(sk, level, optname,
1152 optval, optlen);
1153 }
1154 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1155 }
1156 #endif
1157
1158 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1159 {
1160 switch (cmd) {
1161 case SIOCOUTQ: {
1162 int amount = sk_wmem_alloc_get(sk);
1163
1164 return put_user(amount, (int __user *)arg);
1165 }
1166 case SIOCINQ: {
1167 struct sk_buff *skb;
1168 int amount = 0;
1169
1170 spin_lock_bh(&sk->sk_receive_queue.lock);
1171 skb = skb_peek(&sk->sk_receive_queue);
1172 if (skb)
1173 amount = skb_tail_pointer(skb) -
1174 skb_transport_header(skb);
1175 spin_unlock_bh(&sk->sk_receive_queue.lock);
1176 return put_user(amount, (int __user *)arg);
1177 }
1178
1179 default:
1180 #ifdef CONFIG_IPV6_MROUTE
1181 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1182 #else
1183 return -ENOIOCTLCMD;
1184 #endif
1185 }
1186 }
1187
1188 #ifdef CONFIG_COMPAT
1189 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1190 {
1191 switch (cmd) {
1192 case SIOCOUTQ:
1193 case SIOCINQ:
1194 return -ENOIOCTLCMD;
1195 default:
1196 #ifdef CONFIG_IPV6_MROUTE
1197 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1198 #else
1199 return -ENOIOCTLCMD;
1200 #endif
1201 }
1202 }
1203 #endif
1204
1205 static void rawv6_close(struct sock *sk, long timeout)
1206 {
1207 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1208 ip6_ra_control(sk, -1);
1209 ip6mr_sk_done(sk);
1210 sk_common_release(sk);
1211 }
1212
1213 static void raw6_destroy(struct sock *sk)
1214 {
1215 lock_sock(sk);
1216 ip6_flush_pending_frames(sk);
1217 release_sock(sk);
1218
1219 inet6_destroy_sock(sk);
1220 }
1221
1222 static int rawv6_init_sk(struct sock *sk)
1223 {
1224 struct raw6_sock *rp = raw6_sk(sk);
1225
1226 switch (inet_sk(sk)->inet_num) {
1227 case IPPROTO_ICMPV6:
1228 rp->checksum = 1;
1229 rp->offset = 2;
1230 break;
1231 case IPPROTO_MH:
1232 rp->checksum = 1;
1233 rp->offset = 4;
1234 break;
1235 default:
1236 break;
1237 }
1238 return 0;
1239 }
1240
1241 struct proto rawv6_prot = {
1242 .name = "RAWv6",
1243 .owner = THIS_MODULE,
1244 .close = rawv6_close,
1245 .destroy = raw6_destroy,
1246 .connect = ip6_datagram_connect_v6_only,
1247 .disconnect = __udp_disconnect,
1248 .ioctl = rawv6_ioctl,
1249 .init = rawv6_init_sk,
1250 .setsockopt = rawv6_setsockopt,
1251 .getsockopt = rawv6_getsockopt,
1252 .sendmsg = rawv6_sendmsg,
1253 .recvmsg = rawv6_recvmsg,
1254 .bind = rawv6_bind,
1255 .backlog_rcv = rawv6_rcv_skb,
1256 .hash = raw_hash_sk,
1257 .unhash = raw_unhash_sk,
1258 .obj_size = sizeof(struct raw6_sock),
1259 .h.raw_hash = &raw_v6_hashinfo,
1260 #ifdef CONFIG_COMPAT
1261 .compat_setsockopt = compat_rawv6_setsockopt,
1262 .compat_getsockopt = compat_rawv6_getsockopt,
1263 .compat_ioctl = compat_rawv6_ioctl,
1264 #endif
1265 .diag_destroy = raw_abort,
1266 };
1267
1268 #ifdef CONFIG_PROC_FS
1269 static int raw6_seq_show(struct seq_file *seq, void *v)
1270 {
1271 if (v == SEQ_START_TOKEN) {
1272 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1273 } else {
1274 struct sock *sp = v;
1275 __u16 srcp = inet_sk(sp)->inet_num;
1276 ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1277 raw_seq_private(seq)->bucket);
1278 }
1279 return 0;
1280 }
1281
1282 static const struct seq_operations raw6_seq_ops = {
1283 .start = raw_seq_start,
1284 .next = raw_seq_next,
1285 .stop = raw_seq_stop,
1286 .show = raw6_seq_show,
1287 };
1288
1289 static int raw6_seq_open(struct inode *inode, struct file *file)
1290 {
1291 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1292 }
1293
1294 static const struct file_operations raw6_seq_fops = {
1295 .owner = THIS_MODULE,
1296 .open = raw6_seq_open,
1297 .read = seq_read,
1298 .llseek = seq_lseek,
1299 .release = seq_release_net,
1300 };
1301
1302 static int __net_init raw6_init_net(struct net *net)
1303 {
1304 if (!proc_create("raw6", S_IRUGO, net->proc_net, &raw6_seq_fops))
1305 return -ENOMEM;
1306
1307 return 0;
1308 }
1309
1310 static void __net_exit raw6_exit_net(struct net *net)
1311 {
1312 remove_proc_entry("raw6", net->proc_net);
1313 }
1314
1315 static struct pernet_operations raw6_net_ops = {
1316 .init = raw6_init_net,
1317 .exit = raw6_exit_net,
1318 };
1319
1320 int __init raw6_proc_init(void)
1321 {
1322 return register_pernet_subsys(&raw6_net_ops);
1323 }
1324
1325 void raw6_proc_exit(void)
1326 {
1327 unregister_pernet_subsys(&raw6_net_ops);
1328 }
1329 #endif /* CONFIG_PROC_FS */
1330
1331 /* Same as inet6_dgram_ops, sans udp_poll. */
1332 static const struct proto_ops inet6_sockraw_ops = {
1333 .family = PF_INET6,
1334 .owner = THIS_MODULE,
1335 .release = inet6_release,
1336 .bind = inet6_bind,
1337 .connect = inet_dgram_connect, /* ok */
1338 .socketpair = sock_no_socketpair, /* a do nothing */
1339 .accept = sock_no_accept, /* a do nothing */
1340 .getname = inet6_getname,
1341 .poll = datagram_poll, /* ok */
1342 .ioctl = inet6_ioctl, /* must change */
1343 .listen = sock_no_listen, /* ok */
1344 .shutdown = inet_shutdown, /* ok */
1345 .setsockopt = sock_common_setsockopt, /* ok */
1346 .getsockopt = sock_common_getsockopt, /* ok */
1347 .sendmsg = inet_sendmsg, /* ok */
1348 .recvmsg = sock_common_recvmsg, /* ok */
1349 .mmap = sock_no_mmap,
1350 .sendpage = sock_no_sendpage,
1351 #ifdef CONFIG_COMPAT
1352 .compat_setsockopt = compat_sock_common_setsockopt,
1353 .compat_getsockopt = compat_sock_common_getsockopt,
1354 #endif
1355 };
1356
1357 static struct inet_protosw rawv6_protosw = {
1358 .type = SOCK_RAW,
1359 .protocol = IPPROTO_IP, /* wild card */
1360 .prot = &rawv6_prot,
1361 .ops = &inet6_sockraw_ops,
1362 .flags = INET_PROTOSW_REUSE,
1363 };
1364
1365 int __init rawv6_init(void)
1366 {
1367 return inet6_register_protosw(&rawv6_protosw);
1368 }
1369
1370 void rawv6_exit(void)
1371 {
1372 inet6_unregister_protosw(&rawv6_protosw);
1373 }
ubuntu-zesty-kernel mirror