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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 <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
68struct raw_hashinfo raw_v6_hashinfo = {
69 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
70};
71EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
72
73struct 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, int sdif)
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 &&
90 sk->sk_bound_dev_if != dif &&
91 sk->sk_bound_dev_if != sdif)
92 continue;
93
94 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
95 if (ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))
96 goto found;
97 if (is_multicast &&
98 inet6_mc_check(sk, loc_addr, rmt_addr))
99 goto found;
100 continue;
101 }
102 goto found;
103 }
104 sk = NULL;
105found:
106 return sk;
107}
108EXPORT_SYMBOL_GPL(__raw_v6_lookup);
109
110/*
111 * 0 - deliver
112 * 1 - block
113 */
114static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
115{
116 struct icmp6hdr _hdr;
117 const struct icmp6hdr *hdr;
118
119 /* We require only the four bytes of the ICMPv6 header, not any
120 * additional bytes of message body in "struct icmp6hdr".
121 */
122 hdr = skb_header_pointer(skb, skb_transport_offset(skb),
123 ICMPV6_HDRLEN, &_hdr);
124 if (hdr) {
125 const __u32 *data = &raw6_sk(sk)->filter.data[0];
126 unsigned int type = hdr->icmp6_type;
127
128 return (data[type >> 5] & (1U << (type & 31))) != 0;
129 }
130 return 1;
131}
132
133#if IS_ENABLED(CONFIG_IPV6_MIP6)
134typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
135
136static mh_filter_t __rcu *mh_filter __read_mostly;
137
138int rawv6_mh_filter_register(mh_filter_t filter)
139{
140 rcu_assign_pointer(mh_filter, filter);
141 return 0;
142}
143EXPORT_SYMBOL(rawv6_mh_filter_register);
144
145int rawv6_mh_filter_unregister(mh_filter_t filter)
146{
147 RCU_INIT_POINTER(mh_filter, NULL);
148 synchronize_rcu();
149 return 0;
150}
151EXPORT_SYMBOL(rawv6_mh_filter_unregister);
152
153#endif
154
155/*
156 * demultiplex raw sockets.
157 * (should consider queueing the skb in the sock receive_queue
158 * without calling rawv6.c)
159 *
160 * Caller owns SKB so we must make clones.
161 */
162static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
163{
164 const struct in6_addr *saddr;
165 const struct in6_addr *daddr;
166 struct sock *sk;
167 bool delivered = false;
168 __u8 hash;
169 struct net *net;
170
171 saddr = &ipv6_hdr(skb)->saddr;
172 daddr = saddr + 1;
173
174 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
175
176 read_lock(&raw_v6_hashinfo.lock);
177 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
178
179 if (!sk)
180 goto out;
181
182 net = dev_net(skb->dev);
183 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr,
184 inet6_iif(skb), inet6_sdif(skb));
185
186 while (sk) {
187 int filtered;
188
189 delivered = true;
190 switch (nexthdr) {
191 case IPPROTO_ICMPV6:
192 filtered = icmpv6_filter(sk, skb);
193 break;
194
195#if IS_ENABLED(CONFIG_IPV6_MIP6)
196 case IPPROTO_MH:
197 {
198 /* XXX: To validate MH only once for each packet,
199 * this is placed here. It should be after checking
200 * xfrm policy, however it doesn't. The checking xfrm
201 * policy is placed in rawv6_rcv() because it is
202 * required for each socket.
203 */
204 mh_filter_t *filter;
205
206 filter = rcu_dereference(mh_filter);
207 filtered = filter ? (*filter)(sk, skb) : 0;
208 break;
209 }
210#endif
211 default:
212 filtered = 0;
213 break;
214 }
215
216 if (filtered < 0)
217 break;
218 if (filtered == 0) {
219 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
220
221 /* Not releasing hash table! */
222 if (clone) {
223 nf_reset(clone);
224 rawv6_rcv(sk, clone);
225 }
226 }
227 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
228 inet6_iif(skb), inet6_sdif(skb));
229 }
230out:
231 read_unlock(&raw_v6_hashinfo.lock);
232 return delivered;
233}
234
235bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
236{
237 struct sock *raw_sk;
238
239 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]);
240 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
241 raw_sk = NULL;
242
243 return raw_sk != NULL;
244}
245
246/* This cleans up af_inet6 a bit. -DaveM */
247static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
248{
249 struct inet_sock *inet = inet_sk(sk);
250 struct ipv6_pinfo *np = inet6_sk(sk);
251 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
252 __be32 v4addr = 0;
253 int addr_type;
254 int err;
255
256 if (addr_len < SIN6_LEN_RFC2133)
257 return -EINVAL;
258
259 if (addr->sin6_family != AF_INET6)
260 return -EINVAL;
261
262 addr_type = ipv6_addr_type(&addr->sin6_addr);
263
264 /* Raw sockets are IPv6 only */
265 if (addr_type == IPV6_ADDR_MAPPED)
266 return -EADDRNOTAVAIL;
267
268 lock_sock(sk);
269
270 err = -EINVAL;
271 if (sk->sk_state != TCP_CLOSE)
272 goto out;
273
274 rcu_read_lock();
275 /* Check if the address belongs to the host. */
276 if (addr_type != IPV6_ADDR_ANY) {
277 struct net_device *dev = NULL;
278
279 if (__ipv6_addr_needs_scope_id(addr_type)) {
280 if (addr_len >= sizeof(struct sockaddr_in6) &&
281 addr->sin6_scope_id) {
282 /* Override any existing binding, if another
283 * one is supplied by user.
284 */
285 sk->sk_bound_dev_if = addr->sin6_scope_id;
286 }
287
288 /* Binding to link-local address requires an interface */
289 if (!sk->sk_bound_dev_if)
290 goto out_unlock;
291
292 err = -ENODEV;
293 dev = dev_get_by_index_rcu(sock_net(sk),
294 sk->sk_bound_dev_if);
295 if (!dev)
296 goto out_unlock;
297 }
298
299 /* ipv4 addr of the socket is invalid. Only the
300 * unspecified and mapped address have a v4 equivalent.
301 */
302 v4addr = LOOPBACK4_IPV6;
303 if (!(addr_type & IPV6_ADDR_MULTICAST) &&
304 !sock_net(sk)->ipv6.sysctl.ip_nonlocal_bind) {
305 err = -EADDRNOTAVAIL;
306 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
307 dev, 0)) {
308 goto out_unlock;
309 }
310 }
311 }
312
313 inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
314 sk->sk_v6_rcv_saddr = addr->sin6_addr;
315 if (!(addr_type & IPV6_ADDR_MULTICAST))
316 np->saddr = addr->sin6_addr;
317 err = 0;
318out_unlock:
319 rcu_read_unlock();
320out:
321 release_sock(sk);
322 return err;
323}
324
325static void rawv6_err(struct sock *sk, struct sk_buff *skb,
326 struct inet6_skb_parm *opt,
327 u8 type, u8 code, int offset, __be32 info)
328{
329 struct inet_sock *inet = inet_sk(sk);
330 struct ipv6_pinfo *np = inet6_sk(sk);
331 int err;
332 int harderr;
333
334 /* Report error on raw socket, if:
335 1. User requested recverr.
336 2. Socket is connected (otherwise the error indication
337 is useless without recverr and error is hard.
338 */
339 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
340 return;
341
342 harderr = icmpv6_err_convert(type, code, &err);
343 if (type == ICMPV6_PKT_TOOBIG) {
344 ip6_sk_update_pmtu(skb, sk, info);
345 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
346 }
347 if (type == NDISC_REDIRECT) {
348 ip6_sk_redirect(skb, sk);
349 return;
350 }
351 if (np->recverr) {
352 u8 *payload = skb->data;
353 if (!inet->hdrincl)
354 payload += offset;
355 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
356 }
357
358 if (np->recverr || harderr) {
359 sk->sk_err = err;
360 sk->sk_error_report(sk);
361 }
362}
363
364void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
365 u8 type, u8 code, int inner_offset, __be32 info)
366{
367 struct sock *sk;
368 int hash;
369 const struct in6_addr *saddr, *daddr;
370 struct net *net;
371
372 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
373
374 read_lock(&raw_v6_hashinfo.lock);
375 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
376 if (sk) {
377 /* Note: ipv6_hdr(skb) != skb->data */
378 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
379 saddr = &ip6h->saddr;
380 daddr = &ip6h->daddr;
381 net = dev_net(skb->dev);
382
383 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
384 inet6_iif(skb), inet6_iif(skb)))) {
385 rawv6_err(sk, skb, NULL, type, code,
386 inner_offset, info);
387 sk = sk_next(sk);
388 }
389 }
390 read_unlock(&raw_v6_hashinfo.lock);
391}
392
393static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
394{
395 if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
396 skb_checksum_complete(skb)) {
397 atomic_inc(&sk->sk_drops);
398 kfree_skb(skb);
399 return NET_RX_DROP;
400 }
401
402 /* Charge it to the socket. */
403 skb_dst_drop(skb);
404 if (sock_queue_rcv_skb(sk, skb) < 0) {
405 kfree_skb(skb);
406 return NET_RX_DROP;
407 }
408
409 return 0;
410}
411
412/*
413 * This is next to useless...
414 * if we demultiplex in network layer we don't need the extra call
415 * just to queue the skb...
416 * maybe we could have the network decide upon a hint if it
417 * should call raw_rcv for demultiplexing
418 */
419int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
420{
421 struct inet_sock *inet = inet_sk(sk);
422 struct raw6_sock *rp = raw6_sk(sk);
423
424 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
425 atomic_inc(&sk->sk_drops);
426 kfree_skb(skb);
427 return NET_RX_DROP;
428 }
429
430 if (!rp->checksum)
431 skb->ip_summed = CHECKSUM_UNNECESSARY;
432
433 if (skb->ip_summed == CHECKSUM_COMPLETE) {
434 skb_postpull_rcsum(skb, skb_network_header(skb),
435 skb_network_header_len(skb));
436 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
437 &ipv6_hdr(skb)->daddr,
438 skb->len, inet->inet_num, skb->csum))
439 skb->ip_summed = CHECKSUM_UNNECESSARY;
440 }
441 if (!skb_csum_unnecessary(skb))
442 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
443 &ipv6_hdr(skb)->daddr,
444 skb->len,
445 inet->inet_num, 0));
446
447 if (inet->hdrincl) {
448 if (skb_checksum_complete(skb)) {
449 atomic_inc(&sk->sk_drops);
450 kfree_skb(skb);
451 return NET_RX_DROP;
452 }
453 }
454
455 rawv6_rcv_skb(sk, skb);
456 return 0;
457}
458
459
460/*
461 * This should be easy, if there is something there
462 * we return it, otherwise we block.
463 */
464
465static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
466 int noblock, int flags, int *addr_len)
467{
468 struct ipv6_pinfo *np = inet6_sk(sk);
469 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
470 struct sk_buff *skb;
471 size_t copied;
472 int err;
473
474 if (flags & MSG_OOB)
475 return -EOPNOTSUPP;
476
477 if (flags & MSG_ERRQUEUE)
478 return ipv6_recv_error(sk, msg, len, addr_len);
479
480 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
481 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
482
483 skb = skb_recv_datagram(sk, flags, noblock, &err);
484 if (!skb)
485 goto out;
486
487 copied = skb->len;
488 if (copied > len) {
489 copied = len;
490 msg->msg_flags |= MSG_TRUNC;
491 }
492
493 if (skb_csum_unnecessary(skb)) {
494 err = skb_copy_datagram_msg(skb, 0, msg, copied);
495 } else if (msg->msg_flags&MSG_TRUNC) {
496 if (__skb_checksum_complete(skb))
497 goto csum_copy_err;
498 err = skb_copy_datagram_msg(skb, 0, msg, copied);
499 } else {
500 err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
501 if (err == -EINVAL)
502 goto csum_copy_err;
503 }
504 if (err)
505 goto out_free;
506
507 /* Copy the address. */
508 if (sin6) {
509 sin6->sin6_family = AF_INET6;
510 sin6->sin6_port = 0;
511 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
512 sin6->sin6_flowinfo = 0;
513 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
514 inet6_iif(skb));
515 *addr_len = sizeof(*sin6);
516 }
517
518 sock_recv_ts_and_drops(msg, sk, skb);
519
520 if (np->rxopt.all)
521 ip6_datagram_recv_ctl(sk, msg, skb);
522
523 err = copied;
524 if (flags & MSG_TRUNC)
525 err = skb->len;
526
527out_free:
528 skb_free_datagram(sk, skb);
529out:
530 return err;
531
532csum_copy_err:
533 skb_kill_datagram(sk, skb, flags);
534
535 /* Error for blocking case is chosen to masquerade
536 as some normal condition.
537 */
538 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
539 goto out;
540}
541
542static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
543 struct raw6_sock *rp)
544{
545 struct sk_buff *skb;
546 int err = 0;
547 int offset;
548 int len;
549 int total_len;
550 __wsum tmp_csum;
551 __sum16 csum;
552
553 if (!rp->checksum)
554 goto send;
555
556 skb = skb_peek(&sk->sk_write_queue);
557 if (!skb)
558 goto out;
559
560 offset = rp->offset;
561 total_len = inet_sk(sk)->cork.base.length;
562 if (offset >= total_len - 1) {
563 err = -EINVAL;
564 ip6_flush_pending_frames(sk);
565 goto out;
566 }
567
568 /* should be check HW csum miyazawa */
569 if (skb_queue_len(&sk->sk_write_queue) == 1) {
570 /*
571 * Only one fragment on the socket.
572 */
573 tmp_csum = skb->csum;
574 } else {
575 struct sk_buff *csum_skb = NULL;
576 tmp_csum = 0;
577
578 skb_queue_walk(&sk->sk_write_queue, skb) {
579 tmp_csum = csum_add(tmp_csum, skb->csum);
580
581 if (csum_skb)
582 continue;
583
584 len = skb->len - skb_transport_offset(skb);
585 if (offset >= len) {
586 offset -= len;
587 continue;
588 }
589
590 csum_skb = skb;
591 }
592
593 skb = csum_skb;
594 }
595
596 offset += skb_transport_offset(skb);
597 err = skb_copy_bits(skb, offset, &csum, 2);
598 if (err < 0) {
599 ip6_flush_pending_frames(sk);
600 goto out;
601 }
602
603 /* in case cksum was not initialized */
604 if (unlikely(csum))
605 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
606
607 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
608 total_len, fl6->flowi6_proto, tmp_csum);
609
610 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
611 csum = CSUM_MANGLED_0;
612
613 BUG_ON(skb_store_bits(skb, offset, &csum, 2));
614
615send:
616 err = ip6_push_pending_frames(sk);
617out:
618 return err;
619}
620
621static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
622 struct flowi6 *fl6, struct dst_entry **dstp,
623 unsigned int flags)
624{
625 struct ipv6_pinfo *np = inet6_sk(sk);
626 struct net *net = sock_net(sk);
627 struct ipv6hdr *iph;
628 struct sk_buff *skb;
629 int err;
630 struct rt6_info *rt = (struct rt6_info *)*dstp;
631 int hlen = LL_RESERVED_SPACE(rt->dst.dev);
632 int tlen = rt->dst.dev->needed_tailroom;
633
634 if (length > rt->dst.dev->mtu) {
635 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
636 return -EMSGSIZE;
637 }
638 if (length < sizeof(struct ipv6hdr))
639 return -EINVAL;
640 if (flags&MSG_PROBE)
641 goto out;
642
643 skb = sock_alloc_send_skb(sk,
644 length + hlen + tlen + 15,
645 flags & MSG_DONTWAIT, &err);
646 if (!skb)
647 goto error;
648 skb_reserve(skb, hlen);
649
650 skb->protocol = htons(ETH_P_IPV6);
651 skb->priority = sk->sk_priority;
652 skb->mark = sk->sk_mark;
653 skb_dst_set(skb, &rt->dst);
654 *dstp = NULL;
655
656 skb_put(skb, length);
657 skb_reset_network_header(skb);
658 iph = ipv6_hdr(skb);
659
660 skb->ip_summed = CHECKSUM_NONE;
661
662 if (flags & MSG_CONFIRM)
663 skb_set_dst_pending_confirm(skb, 1);
664
665 skb->transport_header = skb->network_header;
666 err = memcpy_from_msg(iph, msg, length);
667 if (err)
668 goto error_fault;
669
670 /* if egress device is enslaved to an L3 master device pass the
671 * skb to its handler for processing
672 */
673 skb = l3mdev_ip6_out(sk, skb);
674 if (unlikely(!skb))
675 return 0;
676
677 IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
678 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
679 NULL, rt->dst.dev, dst_output);
680 if (err > 0)
681 err = net_xmit_errno(err);
682 if (err)
683 goto error;
684out:
685 return 0;
686
687error_fault:
688 err = -EFAULT;
689 kfree_skb(skb);
690error:
691 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
692 if (err == -ENOBUFS && !np->recverr)
693 err = 0;
694 return err;
695}
696
697struct raw6_frag_vec {
698 struct msghdr *msg;
699 int hlen;
700 char c[4];
701};
702
703static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
704{
705 int err = 0;
706 switch (fl6->flowi6_proto) {
707 case IPPROTO_ICMPV6:
708 rfv->hlen = 2;
709 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
710 if (!err) {
711 fl6->fl6_icmp_type = rfv->c[0];
712 fl6->fl6_icmp_code = rfv->c[1];
713 }
714 break;
715 case IPPROTO_MH:
716 rfv->hlen = 4;
717 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
718 if (!err)
719 fl6->fl6_mh_type = rfv->c[2];
720 }
721 return err;
722}
723
724static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
725 struct sk_buff *skb)
726{
727 struct raw6_frag_vec *rfv = from;
728
729 if (offset < rfv->hlen) {
730 int copy = min(rfv->hlen - offset, len);
731
732 if (skb->ip_summed == CHECKSUM_PARTIAL)
733 memcpy(to, rfv->c + offset, copy);
734 else
735 skb->csum = csum_block_add(
736 skb->csum,
737 csum_partial_copy_nocheck(rfv->c + offset,
738 to, copy, 0),
739 odd);
740
741 odd = 0;
742 offset += copy;
743 to += copy;
744 len -= copy;
745
746 if (!len)
747 return 0;
748 }
749
750 offset -= rfv->hlen;
751
752 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
753}
754
755static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
756{
757 struct ipv6_txoptions *opt_to_free = NULL;
758 struct ipv6_txoptions opt_space;
759 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
760 struct in6_addr *daddr, *final_p, final;
761 struct inet_sock *inet = inet_sk(sk);
762 struct ipv6_pinfo *np = inet6_sk(sk);
763 struct raw6_sock *rp = raw6_sk(sk);
764 struct ipv6_txoptions *opt = NULL;
765 struct ip6_flowlabel *flowlabel = NULL;
766 struct dst_entry *dst = NULL;
767 struct raw6_frag_vec rfv;
768 struct flowi6 fl6;
769 struct sockcm_cookie sockc;
770 struct ipcm6_cookie ipc6;
771 int addr_len = msg->msg_namelen;
772 u16 proto;
773 int err;
774
775 /* Rough check on arithmetic overflow,
776 better check is made in ip6_append_data().
777 */
778 if (len > INT_MAX)
779 return -EMSGSIZE;
780
781 /* Mirror BSD error message compatibility */
782 if (msg->msg_flags & MSG_OOB)
783 return -EOPNOTSUPP;
784
785 /*
786 * Get and verify the address.
787 */
788 memset(&fl6, 0, sizeof(fl6));
789
790 fl6.flowi6_mark = sk->sk_mark;
791 fl6.flowi6_uid = sk->sk_uid;
792
793 ipc6.hlimit = -1;
794 ipc6.tclass = -1;
795 ipc6.dontfrag = -1;
796 ipc6.opt = NULL;
797
798 if (sin6) {
799 if (addr_len < SIN6_LEN_RFC2133)
800 return -EINVAL;
801
802 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
803 return -EAFNOSUPPORT;
804
805 /* port is the proto value [0..255] carried in nexthdr */
806 proto = ntohs(sin6->sin6_port);
807
808 if (!proto)
809 proto = inet->inet_num;
810 else if (proto != inet->inet_num)
811 return -EINVAL;
812
813 if (proto > 255)
814 return -EINVAL;
815
816 daddr = &sin6->sin6_addr;
817 if (np->sndflow) {
818 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
819 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
820 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
821 if (!flowlabel)
822 return -EINVAL;
823 }
824 }
825
826 /*
827 * Otherwise it will be difficult to maintain
828 * sk->sk_dst_cache.
829 */
830 if (sk->sk_state == TCP_ESTABLISHED &&
831 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
832 daddr = &sk->sk_v6_daddr;
833
834 if (addr_len >= sizeof(struct sockaddr_in6) &&
835 sin6->sin6_scope_id &&
836 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
837 fl6.flowi6_oif = sin6->sin6_scope_id;
838 } else {
839 if (sk->sk_state != TCP_ESTABLISHED)
840 return -EDESTADDRREQ;
841
842 proto = inet->inet_num;
843 daddr = &sk->sk_v6_daddr;
844 fl6.flowlabel = np->flow_label;
845 }
846
847 if (fl6.flowi6_oif == 0)
848 fl6.flowi6_oif = sk->sk_bound_dev_if;
849
850 sockc.tsflags = sk->sk_tsflags;
851 if (msg->msg_controllen) {
852 opt = &opt_space;
853 memset(opt, 0, sizeof(struct ipv6_txoptions));
854 opt->tot_len = sizeof(struct ipv6_txoptions);
855 ipc6.opt = opt;
856
857 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc);
858 if (err < 0) {
859 fl6_sock_release(flowlabel);
860 return err;
861 }
862 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
863 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
864 if (!flowlabel)
865 return -EINVAL;
866 }
867 if (!(opt->opt_nflen|opt->opt_flen))
868 opt = NULL;
869 }
870 if (!opt) {
871 opt = txopt_get(np);
872 opt_to_free = opt;
873 }
874 if (flowlabel)
875 opt = fl6_merge_options(&opt_space, flowlabel, opt);
876 opt = ipv6_fixup_options(&opt_space, opt);
877
878 fl6.flowi6_proto = proto;
879 rfv.msg = msg;
880 rfv.hlen = 0;
881 err = rawv6_probe_proto_opt(&rfv, &fl6);
882 if (err)
883 goto out;
884
885 if (!ipv6_addr_any(daddr))
886 fl6.daddr = *daddr;
887 else
888 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
889 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
890 fl6.saddr = np->saddr;
891
892 final_p = fl6_update_dst(&fl6, opt, &final);
893
894 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
895 fl6.flowi6_oif = np->mcast_oif;
896 else if (!fl6.flowi6_oif)
897 fl6.flowi6_oif = np->ucast_oif;
898 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
899
900 if (inet->hdrincl)
901 fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH;
902
903 if (ipc6.tclass < 0)
904 ipc6.tclass = np->tclass;
905
906 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
907
908 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
909 if (IS_ERR(dst)) {
910 err = PTR_ERR(dst);
911 goto out;
912 }
913 if (ipc6.hlimit < 0)
914 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
915
916 if (ipc6.dontfrag < 0)
917 ipc6.dontfrag = np->dontfrag;
918
919 if (msg->msg_flags&MSG_CONFIRM)
920 goto do_confirm;
921
922back_from_confirm:
923 if (inet->hdrincl)
924 err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst, msg->msg_flags);
925 else {
926 ipc6.opt = opt;
927 lock_sock(sk);
928 err = ip6_append_data(sk, raw6_getfrag, &rfv,
929 len, 0, &ipc6, &fl6, (struct rt6_info *)dst,
930 msg->msg_flags, &sockc);
931
932 if (err)
933 ip6_flush_pending_frames(sk);
934 else if (!(msg->msg_flags & MSG_MORE))
935 err = rawv6_push_pending_frames(sk, &fl6, rp);
936 release_sock(sk);
937 }
938done:
939 dst_release(dst);
940out:
941 fl6_sock_release(flowlabel);
942 txopt_put(opt_to_free);
943 return err < 0 ? err : len;
944do_confirm:
945 if (msg->msg_flags & MSG_PROBE)
946 dst_confirm_neigh(dst, &fl6.daddr);
947 if (!(msg->msg_flags & MSG_PROBE) || len)
948 goto back_from_confirm;
949 err = 0;
950 goto done;
951}
952
953static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
954 char __user *optval, int optlen)
955{
956 switch (optname) {
957 case ICMPV6_FILTER:
958 if (optlen > sizeof(struct icmp6_filter))
959 optlen = sizeof(struct icmp6_filter);
960 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
961 return -EFAULT;
962 return 0;
963 default:
964 return -ENOPROTOOPT;
965 }
966
967 return 0;
968}
969
970static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
971 char __user *optval, int __user *optlen)
972{
973 int len;
974
975 switch (optname) {
976 case ICMPV6_FILTER:
977 if (get_user(len, optlen))
978 return -EFAULT;
979 if (len < 0)
980 return -EINVAL;
981 if (len > sizeof(struct icmp6_filter))
982 len = sizeof(struct icmp6_filter);
983 if (put_user(len, optlen))
984 return -EFAULT;
985 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
986 return -EFAULT;
987 return 0;
988 default:
989 return -ENOPROTOOPT;
990 }
991
992 return 0;
993}
994
995
996static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
997 char __user *optval, unsigned int optlen)
998{
999 struct raw6_sock *rp = raw6_sk(sk);
1000 int val;
1001
1002 if (get_user(val, (int __user *)optval))
1003 return -EFAULT;
1004
1005 switch (optname) {
1006 case IPV6_HDRINCL:
1007 if (sk->sk_type != SOCK_RAW)
1008 return -EINVAL;
1009 inet_sk(sk)->hdrincl = !!val;
1010 return 0;
1011 case IPV6_CHECKSUM:
1012 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
1013 level == IPPROTO_IPV6) {
1014 /*
1015 * RFC3542 tells that IPV6_CHECKSUM socket
1016 * option in the IPPROTO_IPV6 level is not
1017 * allowed on ICMPv6 sockets.
1018 * If you want to set it, use IPPROTO_RAW
1019 * level IPV6_CHECKSUM socket option
1020 * (Linux extension).
1021 */
1022 return -EINVAL;
1023 }
1024
1025 /* You may get strange result with a positive odd offset;
1026 RFC2292bis agrees with me. */
1027 if (val > 0 && (val&1))
1028 return -EINVAL;
1029 if (val < 0) {
1030 rp->checksum = 0;
1031 } else {
1032 rp->checksum = 1;
1033 rp->offset = val;
1034 }
1035
1036 return 0;
1037
1038 default:
1039 return -ENOPROTOOPT;
1040 }
1041}
1042
1043static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1044 char __user *optval, unsigned int optlen)
1045{
1046 switch (level) {
1047 case SOL_RAW:
1048 break;
1049
1050 case SOL_ICMPV6:
1051 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1052 return -EOPNOTSUPP;
1053 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1054 case SOL_IPV6:
1055 if (optname == IPV6_CHECKSUM ||
1056 optname == IPV6_HDRINCL)
1057 break;
1058 /* fall through */
1059 default:
1060 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1061 }
1062
1063 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1064}
1065
1066#ifdef CONFIG_COMPAT
1067static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1068 char __user *optval, unsigned int optlen)
1069{
1070 switch (level) {
1071 case SOL_RAW:
1072 break;
1073 case SOL_ICMPV6:
1074 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1075 return -EOPNOTSUPP;
1076 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1077 case SOL_IPV6:
1078 if (optname == IPV6_CHECKSUM ||
1079 optname == IPV6_HDRINCL)
1080 break;
1081 /* fall through */
1082 default:
1083 return compat_ipv6_setsockopt(sk, level, optname,
1084 optval, optlen);
1085 }
1086 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1087}
1088#endif
1089
1090static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1091 char __user *optval, int __user *optlen)
1092{
1093 struct raw6_sock *rp = raw6_sk(sk);
1094 int val, len;
1095
1096 if (get_user(len, optlen))
1097 return -EFAULT;
1098
1099 switch (optname) {
1100 case IPV6_HDRINCL:
1101 val = inet_sk(sk)->hdrincl;
1102 break;
1103 case IPV6_CHECKSUM:
1104 /*
1105 * We allow getsockopt() for IPPROTO_IPV6-level
1106 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1107 * since RFC3542 is silent about it.
1108 */
1109 if (rp->checksum == 0)
1110 val = -1;
1111 else
1112 val = rp->offset;
1113 break;
1114
1115 default:
1116 return -ENOPROTOOPT;
1117 }
1118
1119 len = min_t(unsigned int, sizeof(int), len);
1120
1121 if (put_user(len, optlen))
1122 return -EFAULT;
1123 if (copy_to_user(optval, &val, len))
1124 return -EFAULT;
1125 return 0;
1126}
1127
1128static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1129 char __user *optval, int __user *optlen)
1130{
1131 switch (level) {
1132 case SOL_RAW:
1133 break;
1134
1135 case SOL_ICMPV6:
1136 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1137 return -EOPNOTSUPP;
1138 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1139 case SOL_IPV6:
1140 if (optname == IPV6_CHECKSUM ||
1141 optname == IPV6_HDRINCL)
1142 break;
1143 /* fall through */
1144 default:
1145 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1146 }
1147
1148 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1149}
1150
1151#ifdef CONFIG_COMPAT
1152static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1153 char __user *optval, int __user *optlen)
1154{
1155 switch (level) {
1156 case SOL_RAW:
1157 break;
1158 case SOL_ICMPV6:
1159 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1160 return -EOPNOTSUPP;
1161 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1162 case SOL_IPV6:
1163 if (optname == IPV6_CHECKSUM ||
1164 optname == IPV6_HDRINCL)
1165 break;
1166 /* fall through */
1167 default:
1168 return compat_ipv6_getsockopt(sk, level, optname,
1169 optval, optlen);
1170 }
1171 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1172}
1173#endif
1174
1175static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1176{
1177 switch (cmd) {
1178 case SIOCOUTQ: {
1179 int amount = sk_wmem_alloc_get(sk);
1180
1181 return put_user(amount, (int __user *)arg);
1182 }
1183 case SIOCINQ: {
1184 struct sk_buff *skb;
1185 int amount = 0;
1186
1187 spin_lock_bh(&sk->sk_receive_queue.lock);
1188 skb = skb_peek(&sk->sk_receive_queue);
1189 if (skb)
1190 amount = skb->len;
1191 spin_unlock_bh(&sk->sk_receive_queue.lock);
1192 return put_user(amount, (int __user *)arg);
1193 }
1194
1195 default:
1196#ifdef CONFIG_IPV6_MROUTE
1197 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1198#else
1199 return -ENOIOCTLCMD;
1200#endif
1201 }
1202}
1203
1204#ifdef CONFIG_COMPAT
1205static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1206{
1207 switch (cmd) {
1208 case SIOCOUTQ:
1209 case SIOCINQ:
1210 return -ENOIOCTLCMD;
1211 default:
1212#ifdef CONFIG_IPV6_MROUTE
1213 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1214#else
1215 return -ENOIOCTLCMD;
1216#endif
1217 }
1218}
1219#endif
1220
1221static void rawv6_close(struct sock *sk, long timeout)
1222{
1223 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1224 ip6_ra_control(sk, -1);
1225 ip6mr_sk_done(sk);
1226 sk_common_release(sk);
1227}
1228
1229static void raw6_destroy(struct sock *sk)
1230{
1231 lock_sock(sk);
1232 ip6_flush_pending_frames(sk);
1233 release_sock(sk);
1234
1235 inet6_destroy_sock(sk);
1236}
1237
1238static int rawv6_init_sk(struct sock *sk)
1239{
1240 struct raw6_sock *rp = raw6_sk(sk);
1241
1242 switch (inet_sk(sk)->inet_num) {
1243 case IPPROTO_ICMPV6:
1244 rp->checksum = 1;
1245 rp->offset = 2;
1246 break;
1247 case IPPROTO_MH:
1248 rp->checksum = 1;
1249 rp->offset = 4;
1250 break;
1251 default:
1252 break;
1253 }
1254 return 0;
1255}
1256
1257struct proto rawv6_prot = {
1258 .name = "RAWv6",
1259 .owner = THIS_MODULE,
1260 .close = rawv6_close,
1261 .destroy = raw6_destroy,
1262 .connect = ip6_datagram_connect_v6_only,
1263 .disconnect = __udp_disconnect,
1264 .ioctl = rawv6_ioctl,
1265 .init = rawv6_init_sk,
1266 .setsockopt = rawv6_setsockopt,
1267 .getsockopt = rawv6_getsockopt,
1268 .sendmsg = rawv6_sendmsg,
1269 .recvmsg = rawv6_recvmsg,
1270 .bind = rawv6_bind,
1271 .backlog_rcv = rawv6_rcv_skb,
1272 .hash = raw_hash_sk,
1273 .unhash = raw_unhash_sk,
1274 .obj_size = sizeof(struct raw6_sock),
1275 .useroffset = offsetof(struct raw6_sock, filter),
1276 .usersize = sizeof_field(struct raw6_sock, filter),
1277 .h.raw_hash = &raw_v6_hashinfo,
1278#ifdef CONFIG_COMPAT
1279 .compat_setsockopt = compat_rawv6_setsockopt,
1280 .compat_getsockopt = compat_rawv6_getsockopt,
1281 .compat_ioctl = compat_rawv6_ioctl,
1282#endif
1283 .diag_destroy = raw_abort,
1284};
1285
1286#ifdef CONFIG_PROC_FS
1287static int raw6_seq_show(struct seq_file *seq, void *v)
1288{
1289 if (v == SEQ_START_TOKEN) {
1290 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1291 } else {
1292 struct sock *sp = v;
1293 __u16 srcp = inet_sk(sp)->inet_num;
1294 ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1295 raw_seq_private(seq)->bucket);
1296 }
1297 return 0;
1298}
1299
1300static const struct seq_operations raw6_seq_ops = {
1301 .start = raw_seq_start,
1302 .next = raw_seq_next,
1303 .stop = raw_seq_stop,
1304 .show = raw6_seq_show,
1305};
1306
1307static int raw6_seq_open(struct inode *inode, struct file *file)
1308{
1309 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1310}
1311
1312static const struct file_operations raw6_seq_fops = {
1313 .open = raw6_seq_open,
1314 .read = seq_read,
1315 .llseek = seq_lseek,
1316 .release = seq_release_net,
1317};
1318
1319static int __net_init raw6_init_net(struct net *net)
1320{
1321 if (!proc_create("raw6", 0444, net->proc_net, &raw6_seq_fops))
1322 return -ENOMEM;
1323
1324 return 0;
1325}
1326
1327static void __net_exit raw6_exit_net(struct net *net)
1328{
1329 remove_proc_entry("raw6", net->proc_net);
1330}
1331
1332static struct pernet_operations raw6_net_ops = {
1333 .init = raw6_init_net,
1334 .exit = raw6_exit_net,
1335};
1336
1337int __init raw6_proc_init(void)
1338{
1339 return register_pernet_subsys(&raw6_net_ops);
1340}
1341
1342void raw6_proc_exit(void)
1343{
1344 unregister_pernet_subsys(&raw6_net_ops);
1345}
1346#endif /* CONFIG_PROC_FS */
1347
1348/* Same as inet6_dgram_ops, sans udp_poll. */
1349const struct proto_ops inet6_sockraw_ops = {
1350 .family = PF_INET6,
1351 .owner = THIS_MODULE,
1352 .release = inet6_release,
1353 .bind = inet6_bind,
1354 .connect = inet_dgram_connect, /* ok */
1355 .socketpair = sock_no_socketpair, /* a do nothing */
1356 .accept = sock_no_accept, /* a do nothing */
1357 .getname = inet6_getname,
1358 .poll = datagram_poll, /* ok */
1359 .ioctl = inet6_ioctl, /* must change */
1360 .listen = sock_no_listen, /* ok */
1361 .shutdown = inet_shutdown, /* ok */
1362 .setsockopt = sock_common_setsockopt, /* ok */
1363 .getsockopt = sock_common_getsockopt, /* ok */
1364 .sendmsg = inet_sendmsg, /* ok */
1365 .recvmsg = sock_common_recvmsg, /* ok */
1366 .mmap = sock_no_mmap,
1367 .sendpage = sock_no_sendpage,
1368#ifdef CONFIG_COMPAT
1369 .compat_setsockopt = compat_sock_common_setsockopt,
1370 .compat_getsockopt = compat_sock_common_getsockopt,
1371#endif
1372};
1373
1374static struct inet_protosw rawv6_protosw = {
1375 .type = SOCK_RAW,
1376 .protocol = IPPROTO_IP, /* wild card */
1377 .prot = &rawv6_prot,
1378 .ops = &inet6_sockraw_ops,
1379 .flags = INET_PROTOSW_REUSE,
1380};
1381
1382int __init rawv6_init(void)
1383{
1384 return inet6_register_protosw(&rawv6_protosw);
1385}
1386
1387void rawv6_exit(void)
1388{
1389 inet6_unregister_protosw(&rawv6_protosw);
1390}
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, IP6CB(skb)->iif);
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 IP6CB(skb)->iif);
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 IP6CB(skb)->iif))) {
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 IP6CB(skb)->iif);
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 if (skb_copy_bits(skb, offset, &csum, 2))
592 BUG();
593
594 /* in case cksum was not initialized */
595 if (unlikely(csum))
596 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
597
598 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
599 total_len, fl6->flowi6_proto, tmp_csum);
600
601 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
602 csum = CSUM_MANGLED_0;
603
604 if (skb_store_bits(skb, offset, &csum, 2))
605 BUG();
606
607send:
608 err = ip6_push_pending_frames(sk);
609out:
610 return err;
611}
612
613static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
614 struct flowi6 *fl6, struct dst_entry **dstp,
615 unsigned int flags)
616{
617 struct ipv6_pinfo *np = inet6_sk(sk);
618 struct ipv6hdr *iph;
619 struct sk_buff *skb;
620 int err;
621 struct rt6_info *rt = (struct rt6_info *)*dstp;
622 int hlen = LL_RESERVED_SPACE(rt->dst.dev);
623 int tlen = rt->dst.dev->needed_tailroom;
624
625 if (length > rt->dst.dev->mtu) {
626 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
627 return -EMSGSIZE;
628 }
629 if (flags&MSG_PROBE)
630 goto out;
631
632 skb = sock_alloc_send_skb(sk,
633 length + hlen + tlen + 15,
634 flags & MSG_DONTWAIT, &err);
635 if (skb == NULL)
636 goto error;
637 skb_reserve(skb, hlen);
638
639 skb->protocol = htons(ETH_P_IPV6);
640 skb->priority = sk->sk_priority;
641 skb->mark = sk->sk_mark;
642 skb_dst_set(skb, &rt->dst);
643 *dstp = NULL;
644
645 skb_put(skb, length);
646 skb_reset_network_header(skb);
647 iph = ipv6_hdr(skb);
648
649 skb->ip_summed = CHECKSUM_NONE;
650
651 skb->transport_header = skb->network_header;
652 err = memcpy_fromiovecend((void *)iph, from, 0, length);
653 if (err)
654 goto error_fault;
655
656 IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
657 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
658 rt->dst.dev, dst_output);
659 if (err > 0)
660 err = net_xmit_errno(err);
661 if (err)
662 goto error;
663out:
664 return 0;
665
666error_fault:
667 err = -EFAULT;
668 kfree_skb(skb);
669error:
670 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
671 if (err == -ENOBUFS && !np->recverr)
672 err = 0;
673 return err;
674}
675
676static int rawv6_probe_proto_opt(struct flowi6 *fl6, struct msghdr *msg)
677{
678 struct iovec *iov;
679 u8 __user *type = NULL;
680 u8 __user *code = NULL;
681 u8 len = 0;
682 int probed = 0;
683 int i;
684
685 if (!msg->msg_iov)
686 return 0;
687
688 for (i = 0; i < msg->msg_iovlen; i++) {
689 iov = &msg->msg_iov[i];
690 if (!iov)
691 continue;
692
693 switch (fl6->flowi6_proto) {
694 case IPPROTO_ICMPV6:
695 /* check if one-byte field is readable or not. */
696 if (iov->iov_base && iov->iov_len < 1)
697 break;
698
699 if (!type) {
700 type = iov->iov_base;
701 /* check if code field is readable or not. */
702 if (iov->iov_len > 1)
703 code = type + 1;
704 } else if (!code)
705 code = iov->iov_base;
706
707 if (type && code) {
708 if (get_user(fl6->fl6_icmp_type, type) ||
709 get_user(fl6->fl6_icmp_code, code))
710 return -EFAULT;
711 probed = 1;
712 }
713 break;
714 case IPPROTO_MH:
715 if (iov->iov_base && iov->iov_len < 1)
716 break;
717 /* check if type field is readable or not. */
718 if (iov->iov_len > 2 - len) {
719 u8 __user *p = iov->iov_base;
720 if (get_user(fl6->fl6_mh_type, &p[2 - len]))
721 return -EFAULT;
722 probed = 1;
723 } else
724 len += iov->iov_len;
725
726 break;
727 default:
728 probed = 1;
729 break;
730 }
731 if (probed)
732 break;
733 }
734 return 0;
735}
736
737static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
738 struct msghdr *msg, size_t len)
739{
740 struct ipv6_txoptions opt_space;
741 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
742 struct in6_addr *daddr, *final_p, final;
743 struct inet_sock *inet = inet_sk(sk);
744 struct ipv6_pinfo *np = inet6_sk(sk);
745 struct raw6_sock *rp = raw6_sk(sk);
746 struct ipv6_txoptions *opt = NULL;
747 struct ip6_flowlabel *flowlabel = NULL;
748 struct dst_entry *dst = NULL;
749 struct flowi6 fl6;
750 int addr_len = msg->msg_namelen;
751 int hlimit = -1;
752 int tclass = -1;
753 int dontfrag = -1;
754 u16 proto;
755 int err;
756
757 /* Rough check on arithmetic overflow,
758 better check is made in ip6_append_data().
759 */
760 if (len > INT_MAX)
761 return -EMSGSIZE;
762
763 /* Mirror BSD error message compatibility */
764 if (msg->msg_flags & MSG_OOB)
765 return -EOPNOTSUPP;
766
767 /*
768 * Get and verify the address.
769 */
770 memset(&fl6, 0, sizeof(fl6));
771
772 fl6.flowi6_mark = sk->sk_mark;
773
774 if (sin6) {
775 if (addr_len < SIN6_LEN_RFC2133)
776 return -EINVAL;
777
778 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
779 return -EAFNOSUPPORT;
780
781 /* port is the proto value [0..255] carried in nexthdr */
782 proto = ntohs(sin6->sin6_port);
783
784 if (!proto)
785 proto = inet->inet_num;
786 else if (proto != inet->inet_num)
787 return -EINVAL;
788
789 if (proto > 255)
790 return -EINVAL;
791
792 daddr = &sin6->sin6_addr;
793 if (np->sndflow) {
794 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
795 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
796 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
797 if (flowlabel == NULL)
798 return -EINVAL;
799 }
800 }
801
802 /*
803 * Otherwise it will be difficult to maintain
804 * sk->sk_dst_cache.
805 */
806 if (sk->sk_state == TCP_ESTABLISHED &&
807 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
808 daddr = &sk->sk_v6_daddr;
809
810 if (addr_len >= sizeof(struct sockaddr_in6) &&
811 sin6->sin6_scope_id &&
812 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
813 fl6.flowi6_oif = sin6->sin6_scope_id;
814 } else {
815 if (sk->sk_state != TCP_ESTABLISHED)
816 return -EDESTADDRREQ;
817
818 proto = inet->inet_num;
819 daddr = &sk->sk_v6_daddr;
820 fl6.flowlabel = np->flow_label;
821 }
822
823 if (fl6.flowi6_oif == 0)
824 fl6.flowi6_oif = sk->sk_bound_dev_if;
825
826 if (msg->msg_controllen) {
827 opt = &opt_space;
828 memset(opt, 0, sizeof(struct ipv6_txoptions));
829 opt->tot_len = sizeof(struct ipv6_txoptions);
830
831 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
832 &hlimit, &tclass, &dontfrag);
833 if (err < 0) {
834 fl6_sock_release(flowlabel);
835 return err;
836 }
837 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
838 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
839 if (flowlabel == NULL)
840 return -EINVAL;
841 }
842 if (!(opt->opt_nflen|opt->opt_flen))
843 opt = NULL;
844 }
845 if (opt == NULL)
846 opt = np->opt;
847 if (flowlabel)
848 opt = fl6_merge_options(&opt_space, flowlabel, opt);
849 opt = ipv6_fixup_options(&opt_space, opt);
850
851 fl6.flowi6_proto = proto;
852 err = rawv6_probe_proto_opt(&fl6, msg);
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 if (ipv6_addr_is_multicast(&fl6.daddr))
878 hlimit = np->mcast_hops;
879 else
880 hlimit = np->hop_limit;
881 if (hlimit < 0)
882 hlimit = ip6_dst_hoplimit(dst);
883 }
884
885 if (tclass < 0)
886 tclass = np->tclass;
887
888 if (dontfrag < 0)
889 dontfrag = np->dontfrag;
890
891 if (msg->msg_flags&MSG_CONFIRM)
892 goto do_confirm;
893
894back_from_confirm:
895 if (inet->hdrincl)
896 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl6, &dst, msg->msg_flags);
897 else {
898 lock_sock(sk);
899 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
900 len, 0, hlimit, tclass, opt, &fl6, (struct rt6_info*)dst,
901 msg->msg_flags, dontfrag);
902
903 if (err)
904 ip6_flush_pending_frames(sk);
905 else if (!(msg->msg_flags & MSG_MORE))
906 err = rawv6_push_pending_frames(sk, &fl6, rp);
907 release_sock(sk);
908 }
909done:
910 dst_release(dst);
911out:
912 fl6_sock_release(flowlabel);
913 return err<0?err:len;
914do_confirm:
915 dst_confirm(dst);
916 if (!(msg->msg_flags & MSG_PROBE) || len)
917 goto back_from_confirm;
918 err = 0;
919 goto done;
920}
921
922static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
923 char __user *optval, int optlen)
924{
925 switch (optname) {
926 case ICMPV6_FILTER:
927 if (optlen > sizeof(struct icmp6_filter))
928 optlen = sizeof(struct icmp6_filter);
929 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
930 return -EFAULT;
931 return 0;
932 default:
933 return -ENOPROTOOPT;
934 }
935
936 return 0;
937}
938
939static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
940 char __user *optval, int __user *optlen)
941{
942 int len;
943
944 switch (optname) {
945 case ICMPV6_FILTER:
946 if (get_user(len, optlen))
947 return -EFAULT;
948 if (len < 0)
949 return -EINVAL;
950 if (len > sizeof(struct icmp6_filter))
951 len = sizeof(struct icmp6_filter);
952 if (put_user(len, optlen))
953 return -EFAULT;
954 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
955 return -EFAULT;
956 return 0;
957 default:
958 return -ENOPROTOOPT;
959 }
960
961 return 0;
962}
963
964
965static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
966 char __user *optval, unsigned int optlen)
967{
968 struct raw6_sock *rp = raw6_sk(sk);
969 int val;
970
971 if (get_user(val, (int __user *)optval))
972 return -EFAULT;
973
974 switch (optname) {
975 case IPV6_CHECKSUM:
976 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
977 level == IPPROTO_IPV6) {
978 /*
979 * RFC3542 tells that IPV6_CHECKSUM socket
980 * option in the IPPROTO_IPV6 level is not
981 * allowed on ICMPv6 sockets.
982 * If you want to set it, use IPPROTO_RAW
983 * level IPV6_CHECKSUM socket option
984 * (Linux extension).
985 */
986 return -EINVAL;
987 }
988
989 /* You may get strange result with a positive odd offset;
990 RFC2292bis agrees with me. */
991 if (val > 0 && (val&1))
992 return -EINVAL;
993 if (val < 0) {
994 rp->checksum = 0;
995 } else {
996 rp->checksum = 1;
997 rp->offset = val;
998 }
999
1000 return 0;
1001
1002 default:
1003 return -ENOPROTOOPT;
1004 }
1005}
1006
1007static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1008 char __user *optval, unsigned int optlen)
1009{
1010 switch (level) {
1011 case SOL_RAW:
1012 break;
1013
1014 case SOL_ICMPV6:
1015 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1016 return -EOPNOTSUPP;
1017 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1018 case SOL_IPV6:
1019 if (optname == IPV6_CHECKSUM)
1020 break;
1021 default:
1022 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1023 }
1024
1025 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1026}
1027
1028#ifdef CONFIG_COMPAT
1029static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1030 char __user *optval, unsigned int optlen)
1031{
1032 switch (level) {
1033 case SOL_RAW:
1034 break;
1035 case SOL_ICMPV6:
1036 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1037 return -EOPNOTSUPP;
1038 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1039 case SOL_IPV6:
1040 if (optname == IPV6_CHECKSUM)
1041 break;
1042 default:
1043 return compat_ipv6_setsockopt(sk, level, optname,
1044 optval, optlen);
1045 }
1046 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1047}
1048#endif
1049
1050static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1051 char __user *optval, int __user *optlen)
1052{
1053 struct raw6_sock *rp = raw6_sk(sk);
1054 int val, len;
1055
1056 if (get_user(len,optlen))
1057 return -EFAULT;
1058
1059 switch (optname) {
1060 case IPV6_CHECKSUM:
1061 /*
1062 * We allow getsockopt() for IPPROTO_IPV6-level
1063 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1064 * since RFC3542 is silent about it.
1065 */
1066 if (rp->checksum == 0)
1067 val = -1;
1068 else
1069 val = rp->offset;
1070 break;
1071
1072 default:
1073 return -ENOPROTOOPT;
1074 }
1075
1076 len = min_t(unsigned int, sizeof(int), len);
1077
1078 if (put_user(len, optlen))
1079 return -EFAULT;
1080 if (copy_to_user(optval,&val,len))
1081 return -EFAULT;
1082 return 0;
1083}
1084
1085static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1086 char __user *optval, int __user *optlen)
1087{
1088 switch (level) {
1089 case SOL_RAW:
1090 break;
1091
1092 case SOL_ICMPV6:
1093 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1094 return -EOPNOTSUPP;
1095 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1096 case SOL_IPV6:
1097 if (optname == IPV6_CHECKSUM)
1098 break;
1099 default:
1100 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1101 }
1102
1103 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1104}
1105
1106#ifdef CONFIG_COMPAT
1107static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1108 char __user *optval, int __user *optlen)
1109{
1110 switch (level) {
1111 case SOL_RAW:
1112 break;
1113 case SOL_ICMPV6:
1114 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1115 return -EOPNOTSUPP;
1116 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1117 case SOL_IPV6:
1118 if (optname == IPV6_CHECKSUM)
1119 break;
1120 default:
1121 return compat_ipv6_getsockopt(sk, level, optname,
1122 optval, optlen);
1123 }
1124 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1125}
1126#endif
1127
1128static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1129{
1130 switch (cmd) {
1131 case SIOCOUTQ: {
1132 int amount = sk_wmem_alloc_get(sk);
1133
1134 return put_user(amount, (int __user *)arg);
1135 }
1136 case SIOCINQ: {
1137 struct sk_buff *skb;
1138 int amount = 0;
1139
1140 spin_lock_bh(&sk->sk_receive_queue.lock);
1141 skb = skb_peek(&sk->sk_receive_queue);
1142 if (skb != NULL)
1143 amount = skb_tail_pointer(skb) -
1144 skb_transport_header(skb);
1145 spin_unlock_bh(&sk->sk_receive_queue.lock);
1146 return put_user(amount, (int __user *)arg);
1147 }
1148
1149 default:
1150#ifdef CONFIG_IPV6_MROUTE
1151 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1152#else
1153 return -ENOIOCTLCMD;
1154#endif
1155 }
1156}
1157
1158#ifdef CONFIG_COMPAT
1159static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1160{
1161 switch (cmd) {
1162 case SIOCOUTQ:
1163 case SIOCINQ:
1164 return -ENOIOCTLCMD;
1165 default:
1166#ifdef CONFIG_IPV6_MROUTE
1167 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1168#else
1169 return -ENOIOCTLCMD;
1170#endif
1171 }
1172}
1173#endif
1174
1175static void rawv6_close(struct sock *sk, long timeout)
1176{
1177 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1178 ip6_ra_control(sk, -1);
1179 ip6mr_sk_done(sk);
1180 sk_common_release(sk);
1181}
1182
1183static void raw6_destroy(struct sock *sk)
1184{
1185 lock_sock(sk);
1186 ip6_flush_pending_frames(sk);
1187 release_sock(sk);
1188
1189 inet6_destroy_sock(sk);
1190}
1191
1192static int rawv6_init_sk(struct sock *sk)
1193{
1194 struct raw6_sock *rp = raw6_sk(sk);
1195
1196 switch (inet_sk(sk)->inet_num) {
1197 case IPPROTO_ICMPV6:
1198 rp->checksum = 1;
1199 rp->offset = 2;
1200 break;
1201 case IPPROTO_MH:
1202 rp->checksum = 1;
1203 rp->offset = 4;
1204 break;
1205 default:
1206 break;
1207 }
1208 return 0;
1209}
1210
1211struct proto rawv6_prot = {
1212 .name = "RAWv6",
1213 .owner = THIS_MODULE,
1214 .close = rawv6_close,
1215 .destroy = raw6_destroy,
1216 .connect = ip6_datagram_connect_v6_only,
1217 .disconnect = udp_disconnect,
1218 .ioctl = rawv6_ioctl,
1219 .init = rawv6_init_sk,
1220 .setsockopt = rawv6_setsockopt,
1221 .getsockopt = rawv6_getsockopt,
1222 .sendmsg = rawv6_sendmsg,
1223 .recvmsg = rawv6_recvmsg,
1224 .bind = rawv6_bind,
1225 .backlog_rcv = rawv6_rcv_skb,
1226 .hash = raw_hash_sk,
1227 .unhash = raw_unhash_sk,
1228 .obj_size = sizeof(struct raw6_sock),
1229 .h.raw_hash = &raw_v6_hashinfo,
1230#ifdef CONFIG_COMPAT
1231 .compat_setsockopt = compat_rawv6_setsockopt,
1232 .compat_getsockopt = compat_rawv6_getsockopt,
1233 .compat_ioctl = compat_rawv6_ioctl,
1234#endif
1235};
1236
1237#ifdef CONFIG_PROC_FS
1238static int raw6_seq_show(struct seq_file *seq, void *v)
1239{
1240 if (v == SEQ_START_TOKEN) {
1241 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1242 } else {
1243 struct sock *sp = v;
1244 __u16 srcp = inet_sk(sp)->inet_num;
1245 ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1246 raw_seq_private(seq)->bucket);
1247 }
1248 return 0;
1249}
1250
1251static const struct seq_operations raw6_seq_ops = {
1252 .start = raw_seq_start,
1253 .next = raw_seq_next,
1254 .stop = raw_seq_stop,
1255 .show = raw6_seq_show,
1256};
1257
1258static int raw6_seq_open(struct inode *inode, struct file *file)
1259{
1260 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1261}
1262
1263static const struct file_operations raw6_seq_fops = {
1264 .owner = THIS_MODULE,
1265 .open = raw6_seq_open,
1266 .read = seq_read,
1267 .llseek = seq_lseek,
1268 .release = seq_release_net,
1269};
1270
1271static int __net_init raw6_init_net(struct net *net)
1272{
1273 if (!proc_create("raw6", S_IRUGO, net->proc_net, &raw6_seq_fops))
1274 return -ENOMEM;
1275
1276 return 0;
1277}
1278
1279static void __net_exit raw6_exit_net(struct net *net)
1280{
1281 remove_proc_entry("raw6", net->proc_net);
1282}
1283
1284static struct pernet_operations raw6_net_ops = {
1285 .init = raw6_init_net,
1286 .exit = raw6_exit_net,
1287};
1288
1289int __init raw6_proc_init(void)
1290{
1291 return register_pernet_subsys(&raw6_net_ops);
1292}
1293
1294void raw6_proc_exit(void)
1295{
1296 unregister_pernet_subsys(&raw6_net_ops);
1297}
1298#endif /* CONFIG_PROC_FS */
1299
1300/* Same as inet6_dgram_ops, sans udp_poll. */
1301static const struct proto_ops inet6_sockraw_ops = {
1302 .family = PF_INET6,
1303 .owner = THIS_MODULE,
1304 .release = inet6_release,
1305 .bind = inet6_bind,
1306 .connect = inet_dgram_connect, /* ok */
1307 .socketpair = sock_no_socketpair, /* a do nothing */
1308 .accept = sock_no_accept, /* a do nothing */
1309 .getname = inet6_getname,
1310 .poll = datagram_poll, /* ok */
1311 .ioctl = inet6_ioctl, /* must change */
1312 .listen = sock_no_listen, /* ok */
1313 .shutdown = inet_shutdown, /* ok */
1314 .setsockopt = sock_common_setsockopt, /* ok */
1315 .getsockopt = sock_common_getsockopt, /* ok */
1316 .sendmsg = inet_sendmsg, /* ok */
1317 .recvmsg = sock_common_recvmsg, /* ok */
1318 .mmap = sock_no_mmap,
1319 .sendpage = sock_no_sendpage,
1320#ifdef CONFIG_COMPAT
1321 .compat_setsockopt = compat_sock_common_setsockopt,
1322 .compat_getsockopt = compat_sock_common_getsockopt,
1323#endif
1324};
1325
1326static struct inet_protosw rawv6_protosw = {
1327 .type = SOCK_RAW,
1328 .protocol = IPPROTO_IP, /* wild card */
1329 .prot = &rawv6_prot,
1330 .ops = &inet6_sockraw_ops,
1331 .no_check = UDP_CSUM_DEFAULT,
1332 .flags = INET_PROTOSW_REUSE,
1333};
1334
1335int __init rawv6_init(void)
1336{
1337 int ret;
1338
1339 ret = inet6_register_protosw(&rawv6_protosw);
1340 if (ret)
1341 goto out;
1342out:
1343 return ret;
1344}
1345
1346void rawv6_exit(void)
1347{
1348 inet6_unregister_protosw(&rawv6_protosw);
1349}