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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * RAW sockets for IPv6
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Adapted from linux/net/ipv4/raw.c
10 *
11 * Fixes:
12 * Hideaki YOSHIFUJI : sin6_scope_id support
13 * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance)
14 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
15 */
16
17#include <linux/errno.h>
18#include <linux/types.h>
19#include <linux/socket.h>
20#include <linux/slab.h>
21#include <linux/sockios.h>
22#include <linux/net.h>
23#include <linux/in6.h>
24#include <linux/netdevice.h>
25#include <linux/if_arp.h>
26#include <linux/icmpv6.h>
27#include <linux/netfilter.h>
28#include <linux/netfilter_ipv6.h>
29#include <linux/skbuff.h>
30#include <linux/compat.h>
31#include <linux/uaccess.h>
32#include <asm/ioctls.h>
33
34#include <net/net_namespace.h>
35#include <net/ip.h>
36#include <net/sock.h>
37#include <net/snmp.h>
38
39#include <net/ipv6.h>
40#include <net/ndisc.h>
41#include <net/protocol.h>
42#include <net/ip6_route.h>
43#include <net/ip6_checksum.h>
44#include <net/addrconf.h>
45#include <net/transp_v6.h>
46#include <net/udp.h>
47#include <net/inet_common.h>
48#include <net/tcp_states.h>
49#if IS_ENABLED(CONFIG_IPV6_MIP6)
50#include <net/mip6.h>
51#endif
52#include <linux/mroute6.h>
53
54#include <net/raw.h>
55#include <net/rawv6.h>
56#include <net/xfrm.h>
57
58#include <linux/proc_fs.h>
59#include <linux/seq_file.h>
60#include <linux/export.h>
61
62#define ICMPV6_HDRLEN 4 /* ICMPv6 header, RFC 4443 Section 2.1 */
63
64struct raw_hashinfo raw_v6_hashinfo;
65EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
66
67bool raw_v6_match(struct net *net, const struct sock *sk, unsigned short num,
68 const struct in6_addr *loc_addr,
69 const struct in6_addr *rmt_addr, int dif, int sdif)
70{
71 if (inet_sk(sk)->inet_num != num ||
72 !net_eq(sock_net(sk), net) ||
73 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
74 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
75 !raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
76 dif, sdif))
77 return false;
78
79 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
80 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr) ||
81 (ipv6_addr_is_multicast(loc_addr) &&
82 inet6_mc_check(sk, loc_addr, rmt_addr)))
83 return true;
84
85 return false;
86}
87EXPORT_SYMBOL_GPL(raw_v6_match);
88
89/*
90 * 0 - deliver
91 * 1 - block
92 */
93static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
94{
95 struct icmp6hdr _hdr;
96 const struct icmp6hdr *hdr;
97
98 /* We require only the four bytes of the ICMPv6 header, not any
99 * additional bytes of message body in "struct icmp6hdr".
100 */
101 hdr = skb_header_pointer(skb, skb_transport_offset(skb),
102 ICMPV6_HDRLEN, &_hdr);
103 if (hdr) {
104 const __u32 *data = &raw6_sk(sk)->filter.data[0];
105 unsigned int type = hdr->icmp6_type;
106
107 return (data[type >> 5] & (1U << (type & 31))) != 0;
108 }
109 return 1;
110}
111
112#if IS_ENABLED(CONFIG_IPV6_MIP6)
113typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
114
115static mh_filter_t __rcu *mh_filter __read_mostly;
116
117int rawv6_mh_filter_register(mh_filter_t filter)
118{
119 rcu_assign_pointer(mh_filter, filter);
120 return 0;
121}
122EXPORT_SYMBOL(rawv6_mh_filter_register);
123
124int rawv6_mh_filter_unregister(mh_filter_t filter)
125{
126 RCU_INIT_POINTER(mh_filter, NULL);
127 synchronize_rcu();
128 return 0;
129}
130EXPORT_SYMBOL(rawv6_mh_filter_unregister);
131
132#endif
133
134/*
135 * demultiplex raw sockets.
136 * (should consider queueing the skb in the sock receive_queue
137 * without calling rawv6.c)
138 *
139 * Caller owns SKB so we must make clones.
140 */
141static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
142{
143 struct net *net = dev_net(skb->dev);
144 const struct in6_addr *saddr;
145 const struct in6_addr *daddr;
146 struct hlist_head *hlist;
147 struct sock *sk;
148 bool delivered = false;
149 __u8 hash;
150
151 saddr = &ipv6_hdr(skb)->saddr;
152 daddr = saddr + 1;
153
154 hash = raw_hashfunc(net, nexthdr);
155 hlist = &raw_v6_hashinfo.ht[hash];
156 rcu_read_lock();
157 sk_for_each_rcu(sk, hlist) {
158 int filtered;
159
160 if (!raw_v6_match(net, sk, nexthdr, daddr, saddr,
161 inet6_iif(skb), inet6_sdif(skb)))
162 continue;
163
164 if (atomic_read(&sk->sk_rmem_alloc) >=
165 READ_ONCE(sk->sk_rcvbuf)) {
166 atomic_inc(&sk->sk_drops);
167 continue;
168 }
169
170 delivered = true;
171 switch (nexthdr) {
172 case IPPROTO_ICMPV6:
173 filtered = icmpv6_filter(sk, skb);
174 break;
175
176#if IS_ENABLED(CONFIG_IPV6_MIP6)
177 case IPPROTO_MH:
178 {
179 /* XXX: To validate MH only once for each packet,
180 * this is placed here. It should be after checking
181 * xfrm policy, however it doesn't. The checking xfrm
182 * policy is placed in rawv6_rcv() because it is
183 * required for each socket.
184 */
185 mh_filter_t *filter;
186
187 filter = rcu_dereference(mh_filter);
188 filtered = filter ? (*filter)(sk, skb) : 0;
189 break;
190 }
191#endif
192 default:
193 filtered = 0;
194 break;
195 }
196
197 if (filtered < 0)
198 break;
199 if (filtered == 0) {
200 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
201
202 /* Not releasing hash table! */
203 if (clone)
204 rawv6_rcv(sk, clone);
205 }
206 }
207 rcu_read_unlock();
208 return delivered;
209}
210
211bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
212{
213 return ipv6_raw_deliver(skb, nexthdr);
214}
215
216/* This cleans up af_inet6 a bit. -DaveM */
217static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
218{
219 struct inet_sock *inet = inet_sk(sk);
220 struct ipv6_pinfo *np = inet6_sk(sk);
221 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
222 __be32 v4addr = 0;
223 int addr_type;
224 int err;
225
226 if (addr_len < SIN6_LEN_RFC2133)
227 return -EINVAL;
228
229 if (addr->sin6_family != AF_INET6)
230 return -EINVAL;
231
232 addr_type = ipv6_addr_type(&addr->sin6_addr);
233
234 /* Raw sockets are IPv6 only */
235 if (addr_type == IPV6_ADDR_MAPPED)
236 return -EADDRNOTAVAIL;
237
238 lock_sock(sk);
239
240 err = -EINVAL;
241 if (sk->sk_state != TCP_CLOSE)
242 goto out;
243
244 rcu_read_lock();
245 /* Check if the address belongs to the host. */
246 if (addr_type != IPV6_ADDR_ANY) {
247 struct net_device *dev = NULL;
248
249 if (__ipv6_addr_needs_scope_id(addr_type)) {
250 if (addr_len >= sizeof(struct sockaddr_in6) &&
251 addr->sin6_scope_id) {
252 /* Override any existing binding, if another
253 * one is supplied by user.
254 */
255 sk->sk_bound_dev_if = addr->sin6_scope_id;
256 }
257
258 /* Binding to link-local address requires an interface */
259 if (!sk->sk_bound_dev_if)
260 goto out_unlock;
261 }
262
263 if (sk->sk_bound_dev_if) {
264 err = -ENODEV;
265 dev = dev_get_by_index_rcu(sock_net(sk),
266 sk->sk_bound_dev_if);
267 if (!dev)
268 goto out_unlock;
269 }
270
271 /* ipv4 addr of the socket is invalid. Only the
272 * unspecified and mapped address have a v4 equivalent.
273 */
274 v4addr = LOOPBACK4_IPV6;
275 if (!(addr_type & IPV6_ADDR_MULTICAST) &&
276 !ipv6_can_nonlocal_bind(sock_net(sk), inet)) {
277 err = -EADDRNOTAVAIL;
278 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
279 dev, 0)) {
280 goto out_unlock;
281 }
282 }
283 }
284
285 inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
286 sk->sk_v6_rcv_saddr = addr->sin6_addr;
287 if (!(addr_type & IPV6_ADDR_MULTICAST))
288 np->saddr = addr->sin6_addr;
289 err = 0;
290out_unlock:
291 rcu_read_unlock();
292out:
293 release_sock(sk);
294 return err;
295}
296
297static void rawv6_err(struct sock *sk, struct sk_buff *skb,
298 u8 type, u8 code, int offset, __be32 info)
299{
300 bool recverr = inet6_test_bit(RECVERR6, sk);
301 struct ipv6_pinfo *np = inet6_sk(sk);
302 int err;
303 int harderr;
304
305 /* Report error on raw socket, if:
306 1. User requested recverr.
307 2. Socket is connected (otherwise the error indication
308 is useless without recverr and error is hard.
309 */
310 if (!recverr && sk->sk_state != TCP_ESTABLISHED)
311 return;
312
313 harderr = icmpv6_err_convert(type, code, &err);
314 if (type == ICMPV6_PKT_TOOBIG) {
315 ip6_sk_update_pmtu(skb, sk, info);
316 harderr = (READ_ONCE(np->pmtudisc) == IPV6_PMTUDISC_DO);
317 }
318 if (type == NDISC_REDIRECT) {
319 ip6_sk_redirect(skb, sk);
320 return;
321 }
322 if (recverr) {
323 u8 *payload = skb->data;
324 if (!inet_test_bit(HDRINCL, sk))
325 payload += offset;
326 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
327 }
328
329 if (recverr || harderr) {
330 sk->sk_err = err;
331 sk_error_report(sk);
332 }
333}
334
335void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
336 u8 type, u8 code, int inner_offset, __be32 info)
337{
338 struct net *net = dev_net(skb->dev);
339 struct hlist_head *hlist;
340 struct sock *sk;
341 int hash;
342
343 hash = raw_hashfunc(net, nexthdr);
344 hlist = &raw_v6_hashinfo.ht[hash];
345 rcu_read_lock();
346 sk_for_each_rcu(sk, hlist) {
347 /* Note: ipv6_hdr(skb) != skb->data */
348 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
349
350 if (!raw_v6_match(net, sk, nexthdr, &ip6h->saddr, &ip6h->daddr,
351 inet6_iif(skb), inet6_iif(skb)))
352 continue;
353 rawv6_err(sk, skb, type, code, inner_offset, info);
354 }
355 rcu_read_unlock();
356}
357
358static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
359{
360 enum skb_drop_reason reason;
361
362 if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
363 skb_checksum_complete(skb)) {
364 atomic_inc(&sk->sk_drops);
365 kfree_skb_reason(skb, SKB_DROP_REASON_SKB_CSUM);
366 return NET_RX_DROP;
367 }
368
369 /* Charge it to the socket. */
370 skb_dst_drop(skb);
371 if (sock_queue_rcv_skb_reason(sk, skb, &reason) < 0) {
372 kfree_skb_reason(skb, reason);
373 return NET_RX_DROP;
374 }
375
376 return 0;
377}
378
379/*
380 * This is next to useless...
381 * if we demultiplex in network layer we don't need the extra call
382 * just to queue the skb...
383 * maybe we could have the network decide upon a hint if it
384 * should call raw_rcv for demultiplexing
385 */
386int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
387{
388 struct inet_sock *inet = inet_sk(sk);
389 struct raw6_sock *rp = raw6_sk(sk);
390
391 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
392 atomic_inc(&sk->sk_drops);
393 kfree_skb_reason(skb, SKB_DROP_REASON_XFRM_POLICY);
394 return NET_RX_DROP;
395 }
396 nf_reset_ct(skb);
397
398 if (!rp->checksum)
399 skb->ip_summed = CHECKSUM_UNNECESSARY;
400
401 if (skb->ip_summed == CHECKSUM_COMPLETE) {
402 skb_postpull_rcsum(skb, skb_network_header(skb),
403 skb_network_header_len(skb));
404 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
405 &ipv6_hdr(skb)->daddr,
406 skb->len, inet->inet_num, skb->csum))
407 skb->ip_summed = CHECKSUM_UNNECESSARY;
408 }
409 if (!skb_csum_unnecessary(skb))
410 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
411 &ipv6_hdr(skb)->daddr,
412 skb->len,
413 inet->inet_num, 0));
414
415 if (inet_test_bit(HDRINCL, sk)) {
416 if (skb_checksum_complete(skb)) {
417 atomic_inc(&sk->sk_drops);
418 kfree_skb_reason(skb, SKB_DROP_REASON_SKB_CSUM);
419 return NET_RX_DROP;
420 }
421 }
422
423 rawv6_rcv_skb(sk, skb);
424 return 0;
425}
426
427
428/*
429 * This should be easy, if there is something there
430 * we return it, otherwise we block.
431 */
432
433static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
434 int flags, int *addr_len)
435{
436 struct ipv6_pinfo *np = inet6_sk(sk);
437 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
438 struct sk_buff *skb;
439 size_t copied;
440 int err;
441
442 if (flags & MSG_OOB)
443 return -EOPNOTSUPP;
444
445 if (flags & MSG_ERRQUEUE)
446 return ipv6_recv_error(sk, msg, len, addr_len);
447
448 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
449 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
450
451 skb = skb_recv_datagram(sk, flags, &err);
452 if (!skb)
453 goto out;
454
455 copied = skb->len;
456 if (copied > len) {
457 copied = len;
458 msg->msg_flags |= MSG_TRUNC;
459 }
460
461 if (skb_csum_unnecessary(skb)) {
462 err = skb_copy_datagram_msg(skb, 0, msg, copied);
463 } else if (msg->msg_flags&MSG_TRUNC) {
464 if (__skb_checksum_complete(skb))
465 goto csum_copy_err;
466 err = skb_copy_datagram_msg(skb, 0, msg, copied);
467 } else {
468 err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
469 if (err == -EINVAL)
470 goto csum_copy_err;
471 }
472 if (err)
473 goto out_free;
474
475 /* Copy the address. */
476 if (sin6) {
477 sin6->sin6_family = AF_INET6;
478 sin6->sin6_port = 0;
479 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
480 sin6->sin6_flowinfo = 0;
481 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
482 inet6_iif(skb));
483 *addr_len = sizeof(*sin6);
484 }
485
486 sock_recv_cmsgs(msg, sk, skb);
487
488 if (np->rxopt.all)
489 ip6_datagram_recv_ctl(sk, msg, skb);
490
491 err = copied;
492 if (flags & MSG_TRUNC)
493 err = skb->len;
494
495out_free:
496 skb_free_datagram(sk, skb);
497out:
498 return err;
499
500csum_copy_err:
501 skb_kill_datagram(sk, skb, flags);
502
503 /* Error for blocking case is chosen to masquerade
504 as some normal condition.
505 */
506 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
507 goto out;
508}
509
510static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
511 struct raw6_sock *rp)
512{
513 struct ipv6_txoptions *opt;
514 struct sk_buff *skb;
515 int err = 0;
516 int offset;
517 int len;
518 int total_len;
519 __wsum tmp_csum;
520 __sum16 csum;
521
522 if (!rp->checksum)
523 goto send;
524
525 skb = skb_peek(&sk->sk_write_queue);
526 if (!skb)
527 goto out;
528
529 offset = rp->offset;
530 total_len = inet_sk(sk)->cork.base.length;
531 opt = inet6_sk(sk)->cork.opt;
532 total_len -= opt ? opt->opt_flen : 0;
533
534 if (offset >= total_len - 1) {
535 err = -EINVAL;
536 ip6_flush_pending_frames(sk);
537 goto out;
538 }
539
540 /* should be check HW csum miyazawa */
541 if (skb_queue_len(&sk->sk_write_queue) == 1) {
542 /*
543 * Only one fragment on the socket.
544 */
545 tmp_csum = skb->csum;
546 } else {
547 struct sk_buff *csum_skb = NULL;
548 tmp_csum = 0;
549
550 skb_queue_walk(&sk->sk_write_queue, skb) {
551 tmp_csum = csum_add(tmp_csum, skb->csum);
552
553 if (csum_skb)
554 continue;
555
556 len = skb->len - skb_transport_offset(skb);
557 if (offset >= len) {
558 offset -= len;
559 continue;
560 }
561
562 csum_skb = skb;
563 }
564
565 skb = csum_skb;
566 }
567
568 offset += skb_transport_offset(skb);
569 err = skb_copy_bits(skb, offset, &csum, 2);
570 if (err < 0) {
571 ip6_flush_pending_frames(sk);
572 goto out;
573 }
574
575 /* in case cksum was not initialized */
576 if (unlikely(csum))
577 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
578
579 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
580 total_len, fl6->flowi6_proto, tmp_csum);
581
582 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
583 csum = CSUM_MANGLED_0;
584
585 BUG_ON(skb_store_bits(skb, offset, &csum, 2));
586
587send:
588 err = ip6_push_pending_frames(sk);
589out:
590 return err;
591}
592
593static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
594 struct flowi6 *fl6, struct dst_entry **dstp,
595 unsigned int flags, const struct sockcm_cookie *sockc)
596{
597 struct net *net = sock_net(sk);
598 struct ipv6hdr *iph;
599 struct sk_buff *skb;
600 int err;
601 struct rt6_info *rt = dst_rt6_info(*dstp);
602 int hlen = LL_RESERVED_SPACE(rt->dst.dev);
603 int tlen = rt->dst.dev->needed_tailroom;
604
605 if (length > rt->dst.dev->mtu) {
606 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
607 return -EMSGSIZE;
608 }
609 if (length < sizeof(struct ipv6hdr))
610 return -EINVAL;
611 if (flags&MSG_PROBE)
612 goto out;
613
614 skb = sock_alloc_send_skb(sk,
615 length + hlen + tlen + 15,
616 flags & MSG_DONTWAIT, &err);
617 if (!skb)
618 goto error;
619 skb_reserve(skb, hlen);
620
621 skb->protocol = htons(ETH_P_IPV6);
622 skb->priority = READ_ONCE(sk->sk_priority);
623 skb->mark = sockc->mark;
624 skb->tstamp = sockc->transmit_time;
625
626 skb_put(skb, length);
627 skb_reset_network_header(skb);
628 iph = ipv6_hdr(skb);
629
630 skb->ip_summed = CHECKSUM_NONE;
631
632 skb_setup_tx_timestamp(skb, sockc->tsflags);
633
634 if (flags & MSG_CONFIRM)
635 skb_set_dst_pending_confirm(skb, 1);
636
637 skb->transport_header = skb->network_header;
638 err = memcpy_from_msg(iph, msg, length);
639 if (err) {
640 err = -EFAULT;
641 kfree_skb(skb);
642 goto error;
643 }
644
645 skb_dst_set(skb, &rt->dst);
646 *dstp = NULL;
647
648 /* if egress device is enslaved to an L3 master device pass the
649 * skb to its handler for processing
650 */
651 skb = l3mdev_ip6_out(sk, skb);
652 if (unlikely(!skb))
653 return 0;
654
655 /* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev
656 * in the error path. Since skb has been freed, the dst could
657 * have been queued for deletion.
658 */
659 rcu_read_lock();
660 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS);
661 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
662 NULL, rt->dst.dev, dst_output);
663 if (err > 0)
664 err = net_xmit_errno(err);
665 if (err) {
666 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
667 rcu_read_unlock();
668 goto error_check;
669 }
670 rcu_read_unlock();
671out:
672 return 0;
673
674error:
675 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
676error_check:
677 if (err == -ENOBUFS && !inet6_test_bit(RECVERR6, sk))
678 err = 0;
679 return err;
680}
681
682struct raw6_frag_vec {
683 struct msghdr *msg;
684 int hlen;
685 char c[4];
686};
687
688static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
689{
690 int err = 0;
691 switch (fl6->flowi6_proto) {
692 case IPPROTO_ICMPV6:
693 rfv->hlen = 2;
694 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
695 if (!err) {
696 fl6->fl6_icmp_type = rfv->c[0];
697 fl6->fl6_icmp_code = rfv->c[1];
698 }
699 break;
700 case IPPROTO_MH:
701 rfv->hlen = 4;
702 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
703 if (!err)
704 fl6->fl6_mh_type = rfv->c[2];
705 }
706 return err;
707}
708
709static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
710 struct sk_buff *skb)
711{
712 struct raw6_frag_vec *rfv = from;
713
714 if (offset < rfv->hlen) {
715 int copy = min(rfv->hlen - offset, len);
716
717 if (skb->ip_summed == CHECKSUM_PARTIAL)
718 memcpy(to, rfv->c + offset, copy);
719 else
720 skb->csum = csum_block_add(
721 skb->csum,
722 csum_partial_copy_nocheck(rfv->c + offset,
723 to, copy),
724 odd);
725
726 odd = 0;
727 offset += copy;
728 to += copy;
729 len -= copy;
730
731 if (!len)
732 return 0;
733 }
734
735 offset -= rfv->hlen;
736
737 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
738}
739
740static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
741{
742 struct ipv6_txoptions *opt_to_free = NULL;
743 struct ipv6_txoptions opt_space;
744 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
745 struct in6_addr *daddr, *final_p, final;
746 struct inet_sock *inet = inet_sk(sk);
747 struct ipv6_pinfo *np = inet6_sk(sk);
748 struct raw6_sock *rp = raw6_sk(sk);
749 struct ipv6_txoptions *opt = NULL;
750 struct ip6_flowlabel *flowlabel = NULL;
751 struct dst_entry *dst = NULL;
752 struct raw6_frag_vec rfv;
753 struct flowi6 fl6;
754 struct ipcm6_cookie ipc6;
755 int addr_len = msg->msg_namelen;
756 int hdrincl;
757 u16 proto;
758 int err;
759
760 /* Rough check on arithmetic overflow,
761 better check is made in ip6_append_data().
762 */
763 if (len > INT_MAX)
764 return -EMSGSIZE;
765
766 /* Mirror BSD error message compatibility */
767 if (msg->msg_flags & MSG_OOB)
768 return -EOPNOTSUPP;
769
770 hdrincl = inet_test_bit(HDRINCL, sk);
771
772 /*
773 * Get and verify the address.
774 */
775 memset(&fl6, 0, sizeof(fl6));
776
777 fl6.flowi6_mark = READ_ONCE(sk->sk_mark);
778 fl6.flowi6_uid = sk->sk_uid;
779
780 ipcm6_init(&ipc6);
781 ipc6.sockc.tsflags = READ_ONCE(sk->sk_tsflags);
782 ipc6.sockc.mark = fl6.flowi6_mark;
783
784 if (sin6) {
785 if (addr_len < SIN6_LEN_RFC2133)
786 return -EINVAL;
787
788 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
789 return -EAFNOSUPPORT;
790
791 /* port is the proto value [0..255] carried in nexthdr */
792 proto = ntohs(sin6->sin6_port);
793
794 if (!proto)
795 proto = inet->inet_num;
796 else if (proto != inet->inet_num &&
797 inet->inet_num != IPPROTO_RAW)
798 return -EINVAL;
799
800 if (proto > 255)
801 return -EINVAL;
802
803 daddr = &sin6->sin6_addr;
804 if (inet6_test_bit(SNDFLOW, sk)) {
805 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
806 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
807 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
808 if (IS_ERR(flowlabel))
809 return -EINVAL;
810 }
811 }
812
813 /*
814 * Otherwise it will be difficult to maintain
815 * sk->sk_dst_cache.
816 */
817 if (sk->sk_state == TCP_ESTABLISHED &&
818 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
819 daddr = &sk->sk_v6_daddr;
820
821 if (addr_len >= sizeof(struct sockaddr_in6) &&
822 sin6->sin6_scope_id &&
823 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
824 fl6.flowi6_oif = sin6->sin6_scope_id;
825 } else {
826 if (sk->sk_state != TCP_ESTABLISHED)
827 return -EDESTADDRREQ;
828
829 proto = inet->inet_num;
830 daddr = &sk->sk_v6_daddr;
831 fl6.flowlabel = np->flow_label;
832 }
833
834 if (fl6.flowi6_oif == 0)
835 fl6.flowi6_oif = sk->sk_bound_dev_if;
836
837 if (msg->msg_controllen) {
838 opt = &opt_space;
839 memset(opt, 0, sizeof(struct ipv6_txoptions));
840 opt->tot_len = sizeof(struct ipv6_txoptions);
841 ipc6.opt = opt;
842
843 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
844 if (err < 0) {
845 fl6_sock_release(flowlabel);
846 return err;
847 }
848 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
849 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
850 if (IS_ERR(flowlabel))
851 return -EINVAL;
852 }
853 if (!(opt->opt_nflen|opt->opt_flen))
854 opt = NULL;
855 }
856 if (!opt) {
857 opt = txopt_get(np);
858 opt_to_free = opt;
859 }
860 if (flowlabel)
861 opt = fl6_merge_options(&opt_space, flowlabel, opt);
862 opt = ipv6_fixup_options(&opt_space, opt);
863
864 fl6.flowi6_proto = proto;
865 fl6.flowi6_mark = ipc6.sockc.mark;
866
867 if (!hdrincl) {
868 rfv.msg = msg;
869 rfv.hlen = 0;
870 err = rawv6_probe_proto_opt(&rfv, &fl6);
871 if (err)
872 goto out;
873 }
874
875 if (!ipv6_addr_any(daddr))
876 fl6.daddr = *daddr;
877 else
878 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
879 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
880 fl6.saddr = np->saddr;
881
882 final_p = fl6_update_dst(&fl6, opt, &final);
883
884 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
885 fl6.flowi6_oif = READ_ONCE(np->mcast_oif);
886 else if (!fl6.flowi6_oif)
887 fl6.flowi6_oif = READ_ONCE(np->ucast_oif);
888 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
889
890 if (hdrincl)
891 fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH;
892
893 if (ipc6.tclass < 0)
894 ipc6.tclass = np->tclass;
895
896 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
897
898 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
899 if (IS_ERR(dst)) {
900 err = PTR_ERR(dst);
901 goto out;
902 }
903 if (ipc6.hlimit < 0)
904 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
905
906 if (ipc6.dontfrag < 0)
907 ipc6.dontfrag = inet6_test_bit(DONTFRAG, sk);
908
909 if (msg->msg_flags&MSG_CONFIRM)
910 goto do_confirm;
911
912back_from_confirm:
913 if (hdrincl)
914 err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst,
915 msg->msg_flags, &ipc6.sockc);
916 else {
917 ipc6.opt = opt;
918 lock_sock(sk);
919 err = ip6_append_data(sk, raw6_getfrag, &rfv,
920 len, 0, &ipc6, &fl6, dst_rt6_info(dst),
921 msg->msg_flags);
922
923 if (err)
924 ip6_flush_pending_frames(sk);
925 else if (!(msg->msg_flags & MSG_MORE))
926 err = rawv6_push_pending_frames(sk, &fl6, rp);
927 release_sock(sk);
928 }
929done:
930 dst_release(dst);
931out:
932 fl6_sock_release(flowlabel);
933 txopt_put(opt_to_free);
934 return err < 0 ? err : len;
935do_confirm:
936 if (msg->msg_flags & MSG_PROBE)
937 dst_confirm_neigh(dst, &fl6.daddr);
938 if (!(msg->msg_flags & MSG_PROBE) || len)
939 goto back_from_confirm;
940 err = 0;
941 goto done;
942}
943
944static int rawv6_seticmpfilter(struct sock *sk, int optname,
945 sockptr_t optval, int optlen)
946{
947 switch (optname) {
948 case ICMPV6_FILTER:
949 if (optlen > sizeof(struct icmp6_filter))
950 optlen = sizeof(struct icmp6_filter);
951 if (copy_from_sockptr(&raw6_sk(sk)->filter, optval, optlen))
952 return -EFAULT;
953 return 0;
954 default:
955 return -ENOPROTOOPT;
956 }
957
958 return 0;
959}
960
961static int rawv6_geticmpfilter(struct sock *sk, int optname,
962 char __user *optval, int __user *optlen)
963{
964 int len;
965
966 switch (optname) {
967 case ICMPV6_FILTER:
968 if (get_user(len, optlen))
969 return -EFAULT;
970 if (len < 0)
971 return -EINVAL;
972 if (len > sizeof(struct icmp6_filter))
973 len = sizeof(struct icmp6_filter);
974 if (put_user(len, optlen))
975 return -EFAULT;
976 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
977 return -EFAULT;
978 return 0;
979 default:
980 return -ENOPROTOOPT;
981 }
982
983 return 0;
984}
985
986
987static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
988 sockptr_t optval, unsigned int optlen)
989{
990 struct raw6_sock *rp = raw6_sk(sk);
991 int val;
992
993 if (optlen < sizeof(val))
994 return -EINVAL;
995
996 if (copy_from_sockptr(&val, optval, sizeof(val)))
997 return -EFAULT;
998
999 switch (optname) {
1000 case IPV6_HDRINCL:
1001 if (sk->sk_type != SOCK_RAW)
1002 return -EINVAL;
1003 inet_assign_bit(HDRINCL, sk, val);
1004 return 0;
1005 case IPV6_CHECKSUM:
1006 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
1007 level == IPPROTO_IPV6) {
1008 /*
1009 * RFC3542 tells that IPV6_CHECKSUM socket
1010 * option in the IPPROTO_IPV6 level is not
1011 * allowed on ICMPv6 sockets.
1012 * If you want to set it, use IPPROTO_RAW
1013 * level IPV6_CHECKSUM socket option
1014 * (Linux extension).
1015 */
1016 return -EINVAL;
1017 }
1018
1019 /* You may get strange result with a positive odd offset;
1020 RFC2292bis agrees with me. */
1021 if (val > 0 && (val&1))
1022 return -EINVAL;
1023 if (val < 0) {
1024 rp->checksum = 0;
1025 } else {
1026 rp->checksum = 1;
1027 rp->offset = val;
1028 }
1029
1030 return 0;
1031
1032 default:
1033 return -ENOPROTOOPT;
1034 }
1035}
1036
1037static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1038 sockptr_t optval, unsigned int optlen)
1039{
1040 switch (level) {
1041 case SOL_RAW:
1042 break;
1043
1044 case SOL_ICMPV6:
1045 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1046 return -EOPNOTSUPP;
1047 return rawv6_seticmpfilter(sk, optname, optval, optlen);
1048 case SOL_IPV6:
1049 if (optname == IPV6_CHECKSUM ||
1050 optname == IPV6_HDRINCL)
1051 break;
1052 fallthrough;
1053 default:
1054 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1055 }
1056
1057 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1058}
1059
1060static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1061 char __user *optval, int __user *optlen)
1062{
1063 struct raw6_sock *rp = raw6_sk(sk);
1064 int val, len;
1065
1066 if (get_user(len, optlen))
1067 return -EFAULT;
1068
1069 switch (optname) {
1070 case IPV6_HDRINCL:
1071 val = inet_test_bit(HDRINCL, sk);
1072 break;
1073 case IPV6_CHECKSUM:
1074 /*
1075 * We allow getsockopt() for IPPROTO_IPV6-level
1076 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1077 * since RFC3542 is silent about it.
1078 */
1079 if (rp->checksum == 0)
1080 val = -1;
1081 else
1082 val = rp->offset;
1083 break;
1084
1085 default:
1086 return -ENOPROTOOPT;
1087 }
1088
1089 len = min_t(unsigned int, sizeof(int), len);
1090
1091 if (put_user(len, optlen))
1092 return -EFAULT;
1093 if (copy_to_user(optval, &val, len))
1094 return -EFAULT;
1095 return 0;
1096}
1097
1098static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1099 char __user *optval, int __user *optlen)
1100{
1101 switch (level) {
1102 case SOL_RAW:
1103 break;
1104
1105 case SOL_ICMPV6:
1106 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1107 return -EOPNOTSUPP;
1108 return rawv6_geticmpfilter(sk, optname, optval, optlen);
1109 case SOL_IPV6:
1110 if (optname == IPV6_CHECKSUM ||
1111 optname == IPV6_HDRINCL)
1112 break;
1113 fallthrough;
1114 default:
1115 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1116 }
1117
1118 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1119}
1120
1121static int rawv6_ioctl(struct sock *sk, int cmd, int *karg)
1122{
1123 switch (cmd) {
1124 case SIOCOUTQ: {
1125 *karg = sk_wmem_alloc_get(sk);
1126 return 0;
1127 }
1128 case SIOCINQ: {
1129 struct sk_buff *skb;
1130
1131 spin_lock_bh(&sk->sk_receive_queue.lock);
1132 skb = skb_peek(&sk->sk_receive_queue);
1133 if (skb)
1134 *karg = skb->len;
1135 else
1136 *karg = 0;
1137 spin_unlock_bh(&sk->sk_receive_queue.lock);
1138 return 0;
1139 }
1140
1141 default:
1142#ifdef CONFIG_IPV6_MROUTE
1143 return ip6mr_ioctl(sk, cmd, karg);
1144#else
1145 return -ENOIOCTLCMD;
1146#endif
1147 }
1148}
1149
1150#ifdef CONFIG_COMPAT
1151static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1152{
1153 switch (cmd) {
1154 case SIOCOUTQ:
1155 case SIOCINQ:
1156 return -ENOIOCTLCMD;
1157 default:
1158#ifdef CONFIG_IPV6_MROUTE
1159 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1160#else
1161 return -ENOIOCTLCMD;
1162#endif
1163 }
1164}
1165#endif
1166
1167static void rawv6_close(struct sock *sk, long timeout)
1168{
1169 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1170 ip6_ra_control(sk, -1);
1171 ip6mr_sk_done(sk);
1172 sk_common_release(sk);
1173}
1174
1175static void raw6_destroy(struct sock *sk)
1176{
1177 lock_sock(sk);
1178 ip6_flush_pending_frames(sk);
1179 release_sock(sk);
1180}
1181
1182static int rawv6_init_sk(struct sock *sk)
1183{
1184 struct raw6_sock *rp = raw6_sk(sk);
1185
1186 switch (inet_sk(sk)->inet_num) {
1187 case IPPROTO_ICMPV6:
1188 rp->checksum = 1;
1189 rp->offset = 2;
1190 break;
1191 case IPPROTO_MH:
1192 rp->checksum = 1;
1193 rp->offset = 4;
1194 break;
1195 default:
1196 break;
1197 }
1198 return 0;
1199}
1200
1201struct proto rawv6_prot = {
1202 .name = "RAWv6",
1203 .owner = THIS_MODULE,
1204 .close = rawv6_close,
1205 .destroy = raw6_destroy,
1206 .connect = ip6_datagram_connect_v6_only,
1207 .disconnect = __udp_disconnect,
1208 .ioctl = rawv6_ioctl,
1209 .init = rawv6_init_sk,
1210 .setsockopt = rawv6_setsockopt,
1211 .getsockopt = rawv6_getsockopt,
1212 .sendmsg = rawv6_sendmsg,
1213 .recvmsg = rawv6_recvmsg,
1214 .bind = rawv6_bind,
1215 .backlog_rcv = rawv6_rcv_skb,
1216 .hash = raw_hash_sk,
1217 .unhash = raw_unhash_sk,
1218 .obj_size = sizeof(struct raw6_sock),
1219 .ipv6_pinfo_offset = offsetof(struct raw6_sock, inet6),
1220 .useroffset = offsetof(struct raw6_sock, filter),
1221 .usersize = sizeof_field(struct raw6_sock, filter),
1222 .h.raw_hash = &raw_v6_hashinfo,
1223#ifdef CONFIG_COMPAT
1224 .compat_ioctl = compat_rawv6_ioctl,
1225#endif
1226 .diag_destroy = raw_abort,
1227};
1228
1229#ifdef CONFIG_PROC_FS
1230static int raw6_seq_show(struct seq_file *seq, void *v)
1231{
1232 if (v == SEQ_START_TOKEN) {
1233 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1234 } else {
1235 struct sock *sp = v;
1236 __u16 srcp = inet_sk(sp)->inet_num;
1237 ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1238 raw_seq_private(seq)->bucket);
1239 }
1240 return 0;
1241}
1242
1243static const struct seq_operations raw6_seq_ops = {
1244 .start = raw_seq_start,
1245 .next = raw_seq_next,
1246 .stop = raw_seq_stop,
1247 .show = raw6_seq_show,
1248};
1249
1250static int __net_init raw6_init_net(struct net *net)
1251{
1252 if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops,
1253 sizeof(struct raw_iter_state), &raw_v6_hashinfo))
1254 return -ENOMEM;
1255
1256 return 0;
1257}
1258
1259static void __net_exit raw6_exit_net(struct net *net)
1260{
1261 remove_proc_entry("raw6", net->proc_net);
1262}
1263
1264static struct pernet_operations raw6_net_ops = {
1265 .init = raw6_init_net,
1266 .exit = raw6_exit_net,
1267};
1268
1269int __init raw6_proc_init(void)
1270{
1271 return register_pernet_subsys(&raw6_net_ops);
1272}
1273
1274void raw6_proc_exit(void)
1275{
1276 unregister_pernet_subsys(&raw6_net_ops);
1277}
1278#endif /* CONFIG_PROC_FS */
1279
1280/* Same as inet6_dgram_ops, sans udp_poll. */
1281const struct proto_ops inet6_sockraw_ops = {
1282 .family = PF_INET6,
1283 .owner = THIS_MODULE,
1284 .release = inet6_release,
1285 .bind = inet6_bind,
1286 .connect = inet_dgram_connect, /* ok */
1287 .socketpair = sock_no_socketpair, /* a do nothing */
1288 .accept = sock_no_accept, /* a do nothing */
1289 .getname = inet6_getname,
1290 .poll = datagram_poll, /* ok */
1291 .ioctl = inet6_ioctl, /* must change */
1292 .gettstamp = sock_gettstamp,
1293 .listen = sock_no_listen, /* ok */
1294 .shutdown = inet_shutdown, /* ok */
1295 .setsockopt = sock_common_setsockopt, /* ok */
1296 .getsockopt = sock_common_getsockopt, /* ok */
1297 .sendmsg = inet_sendmsg, /* ok */
1298 .recvmsg = sock_common_recvmsg, /* ok */
1299 .mmap = sock_no_mmap,
1300#ifdef CONFIG_COMPAT
1301 .compat_ioctl = inet6_compat_ioctl,
1302#endif
1303};
1304
1305static struct inet_protosw rawv6_protosw = {
1306 .type = SOCK_RAW,
1307 .protocol = IPPROTO_IP, /* wild card */
1308 .prot = &rawv6_prot,
1309 .ops = &inet6_sockraw_ops,
1310 .flags = INET_PROTOSW_REUSE,
1311};
1312
1313int __init rawv6_init(void)
1314{
1315 return inet6_register_protosw(&rawv6_protosw);
1316}
1317
1318void rawv6_exit(void)
1319{
1320 inet6_unregister_protosw(&rawv6_protosw);
1321}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * RAW sockets for IPv6
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Adapted from linux/net/ipv4/raw.c
10 *
11 * Fixes:
12 * Hideaki YOSHIFUJI : sin6_scope_id support
13 * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance)
14 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
15 */
16
17#include <linux/errno.h>
18#include <linux/types.h>
19#include <linux/socket.h>
20#include <linux/slab.h>
21#include <linux/sockios.h>
22#include <linux/net.h>
23#include <linux/in6.h>
24#include <linux/netdevice.h>
25#include <linux/if_arp.h>
26#include <linux/icmpv6.h>
27#include <linux/netfilter.h>
28#include <linux/netfilter_ipv6.h>
29#include <linux/skbuff.h>
30#include <linux/compat.h>
31#include <linux/uaccess.h>
32#include <asm/ioctls.h>
33
34#include <net/net_namespace.h>
35#include <net/ip.h>
36#include <net/sock.h>
37#include <net/snmp.h>
38
39#include <net/ipv6.h>
40#include <net/ndisc.h>
41#include <net/protocol.h>
42#include <net/ip6_route.h>
43#include <net/ip6_checksum.h>
44#include <net/addrconf.h>
45#include <net/transp_v6.h>
46#include <net/udp.h>
47#include <net/inet_common.h>
48#include <net/tcp_states.h>
49#if IS_ENABLED(CONFIG_IPV6_MIP6)
50#include <net/mip6.h>
51#endif
52#include <linux/mroute6.h>
53
54#include <net/raw.h>
55#include <net/rawv6.h>
56#include <net/xfrm.h>
57
58#include <linux/proc_fs.h>
59#include <linux/seq_file.h>
60#include <linux/export.h>
61
62#define ICMPV6_HDRLEN 4 /* ICMPv6 header, RFC 4443 Section 2.1 */
63
64struct raw_hashinfo raw_v6_hashinfo;
65EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
66
67bool raw_v6_match(struct net *net, struct sock *sk, unsigned short num,
68 const struct in6_addr *loc_addr,
69 const struct in6_addr *rmt_addr, int dif, int sdif)
70{
71 if (inet_sk(sk)->inet_num != num ||
72 !net_eq(sock_net(sk), net) ||
73 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
74 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
75 !raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
76 dif, sdif))
77 return false;
78
79 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
80 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr) ||
81 (ipv6_addr_is_multicast(loc_addr) &&
82 inet6_mc_check(sk, loc_addr, rmt_addr)))
83 return true;
84
85 return false;
86}
87EXPORT_SYMBOL_GPL(raw_v6_match);
88
89/*
90 * 0 - deliver
91 * 1 - block
92 */
93static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
94{
95 struct icmp6hdr _hdr;
96 const struct icmp6hdr *hdr;
97
98 /* We require only the four bytes of the ICMPv6 header, not any
99 * additional bytes of message body in "struct icmp6hdr".
100 */
101 hdr = skb_header_pointer(skb, skb_transport_offset(skb),
102 ICMPV6_HDRLEN, &_hdr);
103 if (hdr) {
104 const __u32 *data = &raw6_sk(sk)->filter.data[0];
105 unsigned int type = hdr->icmp6_type;
106
107 return (data[type >> 5] & (1U << (type & 31))) != 0;
108 }
109 return 1;
110}
111
112#if IS_ENABLED(CONFIG_IPV6_MIP6)
113typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
114
115static mh_filter_t __rcu *mh_filter __read_mostly;
116
117int rawv6_mh_filter_register(mh_filter_t filter)
118{
119 rcu_assign_pointer(mh_filter, filter);
120 return 0;
121}
122EXPORT_SYMBOL(rawv6_mh_filter_register);
123
124int rawv6_mh_filter_unregister(mh_filter_t filter)
125{
126 RCU_INIT_POINTER(mh_filter, NULL);
127 synchronize_rcu();
128 return 0;
129}
130EXPORT_SYMBOL(rawv6_mh_filter_unregister);
131
132#endif
133
134/*
135 * demultiplex raw sockets.
136 * (should consider queueing the skb in the sock receive_queue
137 * without calling rawv6.c)
138 *
139 * Caller owns SKB so we must make clones.
140 */
141static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
142{
143 struct net *net = dev_net(skb->dev);
144 struct hlist_nulls_head *hlist;
145 struct hlist_nulls_node *hnode;
146 const struct in6_addr *saddr;
147 const struct in6_addr *daddr;
148 struct sock *sk;
149 bool delivered = false;
150 __u8 hash;
151
152 saddr = &ipv6_hdr(skb)->saddr;
153 daddr = saddr + 1;
154
155 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
156 hlist = &raw_v6_hashinfo.ht[hash];
157 rcu_read_lock();
158 sk_nulls_for_each(sk, hnode, hlist) {
159 int filtered;
160
161 if (!raw_v6_match(net, sk, nexthdr, daddr, saddr,
162 inet6_iif(skb), inet6_sdif(skb)))
163 continue;
164 delivered = true;
165 switch (nexthdr) {
166 case IPPROTO_ICMPV6:
167 filtered = icmpv6_filter(sk, skb);
168 break;
169
170#if IS_ENABLED(CONFIG_IPV6_MIP6)
171 case IPPROTO_MH:
172 {
173 /* XXX: To validate MH only once for each packet,
174 * this is placed here. It should be after checking
175 * xfrm policy, however it doesn't. The checking xfrm
176 * policy is placed in rawv6_rcv() because it is
177 * required for each socket.
178 */
179 mh_filter_t *filter;
180
181 filter = rcu_dereference(mh_filter);
182 filtered = filter ? (*filter)(sk, skb) : 0;
183 break;
184 }
185#endif
186 default:
187 filtered = 0;
188 break;
189 }
190
191 if (filtered < 0)
192 break;
193 if (filtered == 0) {
194 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
195
196 /* Not releasing hash table! */
197 if (clone) {
198 nf_reset_ct(clone);
199 rawv6_rcv(sk, clone);
200 }
201 }
202 }
203 rcu_read_unlock();
204 return delivered;
205}
206
207bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
208{
209 return ipv6_raw_deliver(skb, nexthdr);
210}
211
212/* This cleans up af_inet6 a bit. -DaveM */
213static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
214{
215 struct inet_sock *inet = inet_sk(sk);
216 struct ipv6_pinfo *np = inet6_sk(sk);
217 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
218 __be32 v4addr = 0;
219 int addr_type;
220 int err;
221
222 if (addr_len < SIN6_LEN_RFC2133)
223 return -EINVAL;
224
225 if (addr->sin6_family != AF_INET6)
226 return -EINVAL;
227
228 addr_type = ipv6_addr_type(&addr->sin6_addr);
229
230 /* Raw sockets are IPv6 only */
231 if (addr_type == IPV6_ADDR_MAPPED)
232 return -EADDRNOTAVAIL;
233
234 lock_sock(sk);
235
236 err = -EINVAL;
237 if (sk->sk_state != TCP_CLOSE)
238 goto out;
239
240 rcu_read_lock();
241 /* Check if the address belongs to the host. */
242 if (addr_type != IPV6_ADDR_ANY) {
243 struct net_device *dev = NULL;
244
245 if (__ipv6_addr_needs_scope_id(addr_type)) {
246 if (addr_len >= sizeof(struct sockaddr_in6) &&
247 addr->sin6_scope_id) {
248 /* Override any existing binding, if another
249 * one is supplied by user.
250 */
251 sk->sk_bound_dev_if = addr->sin6_scope_id;
252 }
253
254 /* Binding to link-local address requires an interface */
255 if (!sk->sk_bound_dev_if)
256 goto out_unlock;
257 }
258
259 if (sk->sk_bound_dev_if) {
260 err = -ENODEV;
261 dev = dev_get_by_index_rcu(sock_net(sk),
262 sk->sk_bound_dev_if);
263 if (!dev)
264 goto out_unlock;
265 }
266
267 /* ipv4 addr of the socket is invalid. Only the
268 * unspecified and mapped address have a v4 equivalent.
269 */
270 v4addr = LOOPBACK4_IPV6;
271 if (!(addr_type & IPV6_ADDR_MULTICAST) &&
272 !ipv6_can_nonlocal_bind(sock_net(sk), inet)) {
273 err = -EADDRNOTAVAIL;
274 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
275 dev, 0)) {
276 goto out_unlock;
277 }
278 }
279 }
280
281 inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
282 sk->sk_v6_rcv_saddr = addr->sin6_addr;
283 if (!(addr_type & IPV6_ADDR_MULTICAST))
284 np->saddr = addr->sin6_addr;
285 err = 0;
286out_unlock:
287 rcu_read_unlock();
288out:
289 release_sock(sk);
290 return err;
291}
292
293static void rawv6_err(struct sock *sk, struct sk_buff *skb,
294 struct inet6_skb_parm *opt,
295 u8 type, u8 code, int offset, __be32 info)
296{
297 struct inet_sock *inet = inet_sk(sk);
298 struct ipv6_pinfo *np = inet6_sk(sk);
299 int err;
300 int harderr;
301
302 /* Report error on raw socket, if:
303 1. User requested recverr.
304 2. Socket is connected (otherwise the error indication
305 is useless without recverr and error is hard.
306 */
307 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
308 return;
309
310 harderr = icmpv6_err_convert(type, code, &err);
311 if (type == ICMPV6_PKT_TOOBIG) {
312 ip6_sk_update_pmtu(skb, sk, info);
313 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
314 }
315 if (type == NDISC_REDIRECT) {
316 ip6_sk_redirect(skb, sk);
317 return;
318 }
319 if (np->recverr) {
320 u8 *payload = skb->data;
321 if (!inet->hdrincl)
322 payload += offset;
323 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
324 }
325
326 if (np->recverr || harderr) {
327 sk->sk_err = err;
328 sk_error_report(sk);
329 }
330}
331
332void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
333 u8 type, u8 code, int inner_offset, __be32 info)
334{
335 struct net *net = dev_net(skb->dev);
336 struct hlist_nulls_head *hlist;
337 struct hlist_nulls_node *hnode;
338 struct sock *sk;
339 int hash;
340
341 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
342 hlist = &raw_v6_hashinfo.ht[hash];
343 rcu_read_lock();
344 sk_nulls_for_each(sk, hnode, hlist) {
345 /* Note: ipv6_hdr(skb) != skb->data */
346 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
347
348 if (!raw_v6_match(net, sk, nexthdr, &ip6h->saddr, &ip6h->daddr,
349 inet6_iif(skb), inet6_iif(skb)))
350 continue;
351 rawv6_err(sk, skb, NULL, type, code, inner_offset, info);
352 }
353 rcu_read_unlock();
354}
355
356static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
357{
358 if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
359 skb_checksum_complete(skb)) {
360 atomic_inc(&sk->sk_drops);
361 kfree_skb(skb);
362 return NET_RX_DROP;
363 }
364
365 /* Charge it to the socket. */
366 skb_dst_drop(skb);
367 if (sock_queue_rcv_skb(sk, skb) < 0) {
368 kfree_skb(skb);
369 return NET_RX_DROP;
370 }
371
372 return 0;
373}
374
375/*
376 * This is next to useless...
377 * if we demultiplex in network layer we don't need the extra call
378 * just to queue the skb...
379 * maybe we could have the network decide upon a hint if it
380 * should call raw_rcv for demultiplexing
381 */
382int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
383{
384 struct inet_sock *inet = inet_sk(sk);
385 struct raw6_sock *rp = raw6_sk(sk);
386
387 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
388 atomic_inc(&sk->sk_drops);
389 kfree_skb(skb);
390 return NET_RX_DROP;
391 }
392
393 if (!rp->checksum)
394 skb->ip_summed = CHECKSUM_UNNECESSARY;
395
396 if (skb->ip_summed == CHECKSUM_COMPLETE) {
397 skb_postpull_rcsum(skb, skb_network_header(skb),
398 skb_network_header_len(skb));
399 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
400 &ipv6_hdr(skb)->daddr,
401 skb->len, inet->inet_num, skb->csum))
402 skb->ip_summed = CHECKSUM_UNNECESSARY;
403 }
404 if (!skb_csum_unnecessary(skb))
405 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
406 &ipv6_hdr(skb)->daddr,
407 skb->len,
408 inet->inet_num, 0));
409
410 if (inet->hdrincl) {
411 if (skb_checksum_complete(skb)) {
412 atomic_inc(&sk->sk_drops);
413 kfree_skb(skb);
414 return NET_RX_DROP;
415 }
416 }
417
418 rawv6_rcv_skb(sk, skb);
419 return 0;
420}
421
422
423/*
424 * This should be easy, if there is something there
425 * we return it, otherwise we block.
426 */
427
428static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
429 int flags, int *addr_len)
430{
431 struct ipv6_pinfo *np = inet6_sk(sk);
432 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
433 struct sk_buff *skb;
434 size_t copied;
435 int err;
436
437 if (flags & MSG_OOB)
438 return -EOPNOTSUPP;
439
440 if (flags & MSG_ERRQUEUE)
441 return ipv6_recv_error(sk, msg, len, addr_len);
442
443 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
444 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
445
446 skb = skb_recv_datagram(sk, flags, &err);
447 if (!skb)
448 goto out;
449
450 copied = skb->len;
451 if (copied > len) {
452 copied = len;
453 msg->msg_flags |= MSG_TRUNC;
454 }
455
456 if (skb_csum_unnecessary(skb)) {
457 err = skb_copy_datagram_msg(skb, 0, msg, copied);
458 } else if (msg->msg_flags&MSG_TRUNC) {
459 if (__skb_checksum_complete(skb))
460 goto csum_copy_err;
461 err = skb_copy_datagram_msg(skb, 0, msg, copied);
462 } else {
463 err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
464 if (err == -EINVAL)
465 goto csum_copy_err;
466 }
467 if (err)
468 goto out_free;
469
470 /* Copy the address. */
471 if (sin6) {
472 sin6->sin6_family = AF_INET6;
473 sin6->sin6_port = 0;
474 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
475 sin6->sin6_flowinfo = 0;
476 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
477 inet6_iif(skb));
478 *addr_len = sizeof(*sin6);
479 }
480
481 sock_recv_cmsgs(msg, sk, skb);
482
483 if (np->rxopt.all)
484 ip6_datagram_recv_ctl(sk, msg, skb);
485
486 err = copied;
487 if (flags & MSG_TRUNC)
488 err = skb->len;
489
490out_free:
491 skb_free_datagram(sk, skb);
492out:
493 return err;
494
495csum_copy_err:
496 skb_kill_datagram(sk, skb, flags);
497
498 /* Error for blocking case is chosen to masquerade
499 as some normal condition.
500 */
501 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
502 goto out;
503}
504
505static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
506 struct raw6_sock *rp)
507{
508 struct ipv6_txoptions *opt;
509 struct sk_buff *skb;
510 int err = 0;
511 int offset;
512 int len;
513 int total_len;
514 __wsum tmp_csum;
515 __sum16 csum;
516
517 if (!rp->checksum)
518 goto send;
519
520 skb = skb_peek(&sk->sk_write_queue);
521 if (!skb)
522 goto out;
523
524 offset = rp->offset;
525 total_len = inet_sk(sk)->cork.base.length;
526 opt = inet6_sk(sk)->cork.opt;
527 total_len -= opt ? opt->opt_flen : 0;
528
529 if (offset >= total_len - 1) {
530 err = -EINVAL;
531 ip6_flush_pending_frames(sk);
532 goto out;
533 }
534
535 /* should be check HW csum miyazawa */
536 if (skb_queue_len(&sk->sk_write_queue) == 1) {
537 /*
538 * Only one fragment on the socket.
539 */
540 tmp_csum = skb->csum;
541 } else {
542 struct sk_buff *csum_skb = NULL;
543 tmp_csum = 0;
544
545 skb_queue_walk(&sk->sk_write_queue, skb) {
546 tmp_csum = csum_add(tmp_csum, skb->csum);
547
548 if (csum_skb)
549 continue;
550
551 len = skb->len - skb_transport_offset(skb);
552 if (offset >= len) {
553 offset -= len;
554 continue;
555 }
556
557 csum_skb = skb;
558 }
559
560 skb = csum_skb;
561 }
562
563 offset += skb_transport_offset(skb);
564 err = skb_copy_bits(skb, offset, &csum, 2);
565 if (err < 0) {
566 ip6_flush_pending_frames(sk);
567 goto out;
568 }
569
570 /* in case cksum was not initialized */
571 if (unlikely(csum))
572 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
573
574 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
575 total_len, fl6->flowi6_proto, tmp_csum);
576
577 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
578 csum = CSUM_MANGLED_0;
579
580 BUG_ON(skb_store_bits(skb, offset, &csum, 2));
581
582send:
583 err = ip6_push_pending_frames(sk);
584out:
585 return err;
586}
587
588static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
589 struct flowi6 *fl6, struct dst_entry **dstp,
590 unsigned int flags, const struct sockcm_cookie *sockc)
591{
592 struct ipv6_pinfo *np = inet6_sk(sk);
593 struct net *net = sock_net(sk);
594 struct ipv6hdr *iph;
595 struct sk_buff *skb;
596 int err;
597 struct rt6_info *rt = (struct rt6_info *)*dstp;
598 int hlen = LL_RESERVED_SPACE(rt->dst.dev);
599 int tlen = rt->dst.dev->needed_tailroom;
600
601 if (length > rt->dst.dev->mtu) {
602 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
603 return -EMSGSIZE;
604 }
605 if (length < sizeof(struct ipv6hdr))
606 return -EINVAL;
607 if (flags&MSG_PROBE)
608 goto out;
609
610 skb = sock_alloc_send_skb(sk,
611 length + hlen + tlen + 15,
612 flags & MSG_DONTWAIT, &err);
613 if (!skb)
614 goto error;
615 skb_reserve(skb, hlen);
616
617 skb->protocol = htons(ETH_P_IPV6);
618 skb->priority = sk->sk_priority;
619 skb->mark = sockc->mark;
620 skb->tstamp = sockc->transmit_time;
621
622 skb_put(skb, length);
623 skb_reset_network_header(skb);
624 iph = ipv6_hdr(skb);
625
626 skb->ip_summed = CHECKSUM_NONE;
627
628 skb_setup_tx_timestamp(skb, sockc->tsflags);
629
630 if (flags & MSG_CONFIRM)
631 skb_set_dst_pending_confirm(skb, 1);
632
633 skb->transport_header = skb->network_header;
634 err = memcpy_from_msg(iph, msg, length);
635 if (err) {
636 err = -EFAULT;
637 kfree_skb(skb);
638 goto error;
639 }
640
641 skb_dst_set(skb, &rt->dst);
642 *dstp = NULL;
643
644 /* if egress device is enslaved to an L3 master device pass the
645 * skb to its handler for processing
646 */
647 skb = l3mdev_ip6_out(sk, skb);
648 if (unlikely(!skb))
649 return 0;
650
651 /* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev
652 * in the error path. Since skb has been freed, the dst could
653 * have been queued for deletion.
654 */
655 rcu_read_lock();
656 IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
657 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
658 NULL, rt->dst.dev, dst_output);
659 if (err > 0)
660 err = net_xmit_errno(err);
661 if (err) {
662 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
663 rcu_read_unlock();
664 goto error_check;
665 }
666 rcu_read_unlock();
667out:
668 return 0;
669
670error:
671 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
672error_check:
673 if (err == -ENOBUFS && !np->recverr)
674 err = 0;
675 return err;
676}
677
678struct raw6_frag_vec {
679 struct msghdr *msg;
680 int hlen;
681 char c[4];
682};
683
684static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
685{
686 int err = 0;
687 switch (fl6->flowi6_proto) {
688 case IPPROTO_ICMPV6:
689 rfv->hlen = 2;
690 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
691 if (!err) {
692 fl6->fl6_icmp_type = rfv->c[0];
693 fl6->fl6_icmp_code = rfv->c[1];
694 }
695 break;
696 case IPPROTO_MH:
697 rfv->hlen = 4;
698 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
699 if (!err)
700 fl6->fl6_mh_type = rfv->c[2];
701 }
702 return err;
703}
704
705static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
706 struct sk_buff *skb)
707{
708 struct raw6_frag_vec *rfv = from;
709
710 if (offset < rfv->hlen) {
711 int copy = min(rfv->hlen - offset, len);
712
713 if (skb->ip_summed == CHECKSUM_PARTIAL)
714 memcpy(to, rfv->c + offset, copy);
715 else
716 skb->csum = csum_block_add(
717 skb->csum,
718 csum_partial_copy_nocheck(rfv->c + offset,
719 to, copy),
720 odd);
721
722 odd = 0;
723 offset += copy;
724 to += copy;
725 len -= copy;
726
727 if (!len)
728 return 0;
729 }
730
731 offset -= rfv->hlen;
732
733 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
734}
735
736static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
737{
738 struct ipv6_txoptions *opt_to_free = NULL;
739 struct ipv6_txoptions opt_space;
740 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
741 struct in6_addr *daddr, *final_p, final;
742 struct inet_sock *inet = inet_sk(sk);
743 struct ipv6_pinfo *np = inet6_sk(sk);
744 struct raw6_sock *rp = raw6_sk(sk);
745 struct ipv6_txoptions *opt = NULL;
746 struct ip6_flowlabel *flowlabel = NULL;
747 struct dst_entry *dst = NULL;
748 struct raw6_frag_vec rfv;
749 struct flowi6 fl6;
750 struct ipcm6_cookie ipc6;
751 int addr_len = msg->msg_namelen;
752 int hdrincl;
753 u16 proto;
754 int err;
755
756 /* Rough check on arithmetic overflow,
757 better check is made in ip6_append_data().
758 */
759 if (len > INT_MAX)
760 return -EMSGSIZE;
761
762 /* Mirror BSD error message compatibility */
763 if (msg->msg_flags & MSG_OOB)
764 return -EOPNOTSUPP;
765
766 /* hdrincl should be READ_ONCE(inet->hdrincl)
767 * but READ_ONCE() doesn't work with bit fields.
768 * Doing this indirectly yields the same result.
769 */
770 hdrincl = inet->hdrincl;
771 hdrincl = READ_ONCE(hdrincl);
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 ipcm6_init(&ipc6);
782 ipc6.sockc.tsflags = sk->sk_tsflags;
783 ipc6.sockc.mark = sk->sk_mark;
784
785 if (sin6) {
786 if (addr_len < SIN6_LEN_RFC2133)
787 return -EINVAL;
788
789 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
790 return -EAFNOSUPPORT;
791
792 /* port is the proto value [0..255] carried in nexthdr */
793 proto = ntohs(sin6->sin6_port);
794
795 if (!proto)
796 proto = inet->inet_num;
797 else if (proto != inet->inet_num)
798 return -EINVAL;
799
800 if (proto > 255)
801 return -EINVAL;
802
803 daddr = &sin6->sin6_addr;
804 if (np->sndflow) {
805 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
806 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
807 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
808 if (IS_ERR(flowlabel))
809 return -EINVAL;
810 }
811 }
812
813 /*
814 * Otherwise it will be difficult to maintain
815 * sk->sk_dst_cache.
816 */
817 if (sk->sk_state == TCP_ESTABLISHED &&
818 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
819 daddr = &sk->sk_v6_daddr;
820
821 if (addr_len >= sizeof(struct sockaddr_in6) &&
822 sin6->sin6_scope_id &&
823 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
824 fl6.flowi6_oif = sin6->sin6_scope_id;
825 } else {
826 if (sk->sk_state != TCP_ESTABLISHED)
827 return -EDESTADDRREQ;
828
829 proto = inet->inet_num;
830 daddr = &sk->sk_v6_daddr;
831 fl6.flowlabel = np->flow_label;
832 }
833
834 if (fl6.flowi6_oif == 0)
835 fl6.flowi6_oif = sk->sk_bound_dev_if;
836
837 if (msg->msg_controllen) {
838 opt = &opt_space;
839 memset(opt, 0, sizeof(struct ipv6_txoptions));
840 opt->tot_len = sizeof(struct ipv6_txoptions);
841 ipc6.opt = opt;
842
843 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
844 if (err < 0) {
845 fl6_sock_release(flowlabel);
846 return err;
847 }
848 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
849 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
850 if (IS_ERR(flowlabel))
851 return -EINVAL;
852 }
853 if (!(opt->opt_nflen|opt->opt_flen))
854 opt = NULL;
855 }
856 if (!opt) {
857 opt = txopt_get(np);
858 opt_to_free = opt;
859 }
860 if (flowlabel)
861 opt = fl6_merge_options(&opt_space, flowlabel, opt);
862 opt = ipv6_fixup_options(&opt_space, opt);
863
864 fl6.flowi6_proto = proto;
865 fl6.flowi6_mark = ipc6.sockc.mark;
866
867 if (!hdrincl) {
868 rfv.msg = msg;
869 rfv.hlen = 0;
870 err = rawv6_probe_proto_opt(&rfv, &fl6);
871 if (err)
872 goto out;
873 }
874
875 if (!ipv6_addr_any(daddr))
876 fl6.daddr = *daddr;
877 else
878 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
879 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
880 fl6.saddr = np->saddr;
881
882 final_p = fl6_update_dst(&fl6, opt, &final);
883
884 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
885 fl6.flowi6_oif = np->mcast_oif;
886 else if (!fl6.flowi6_oif)
887 fl6.flowi6_oif = np->ucast_oif;
888 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
889
890 if (hdrincl)
891 fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH;
892
893 if (ipc6.tclass < 0)
894 ipc6.tclass = np->tclass;
895
896 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
897
898 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
899 if (IS_ERR(dst)) {
900 err = PTR_ERR(dst);
901 goto out;
902 }
903 if (ipc6.hlimit < 0)
904 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
905
906 if (ipc6.dontfrag < 0)
907 ipc6.dontfrag = np->dontfrag;
908
909 if (msg->msg_flags&MSG_CONFIRM)
910 goto do_confirm;
911
912back_from_confirm:
913 if (hdrincl)
914 err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst,
915 msg->msg_flags, &ipc6.sockc);
916 else {
917 ipc6.opt = opt;
918 lock_sock(sk);
919 err = ip6_append_data(sk, raw6_getfrag, &rfv,
920 len, 0, &ipc6, &fl6, (struct rt6_info *)dst,
921 msg->msg_flags);
922
923 if (err)
924 ip6_flush_pending_frames(sk);
925 else if (!(msg->msg_flags & MSG_MORE))
926 err = rawv6_push_pending_frames(sk, &fl6, rp);
927 release_sock(sk);
928 }
929done:
930 dst_release(dst);
931out:
932 fl6_sock_release(flowlabel);
933 txopt_put(opt_to_free);
934 return err < 0 ? err : len;
935do_confirm:
936 if (msg->msg_flags & MSG_PROBE)
937 dst_confirm_neigh(dst, &fl6.daddr);
938 if (!(msg->msg_flags & MSG_PROBE) || len)
939 goto back_from_confirm;
940 err = 0;
941 goto done;
942}
943
944static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
945 sockptr_t optval, int optlen)
946{
947 switch (optname) {
948 case ICMPV6_FILTER:
949 if (optlen > sizeof(struct icmp6_filter))
950 optlen = sizeof(struct icmp6_filter);
951 if (copy_from_sockptr(&raw6_sk(sk)->filter, optval, optlen))
952 return -EFAULT;
953 return 0;
954 default:
955 return -ENOPROTOOPT;
956 }
957
958 return 0;
959}
960
961static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
962 char __user *optval, int __user *optlen)
963{
964 int len;
965
966 switch (optname) {
967 case ICMPV6_FILTER:
968 if (get_user(len, optlen))
969 return -EFAULT;
970 if (len < 0)
971 return -EINVAL;
972 if (len > sizeof(struct icmp6_filter))
973 len = sizeof(struct icmp6_filter);
974 if (put_user(len, optlen))
975 return -EFAULT;
976 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
977 return -EFAULT;
978 return 0;
979 default:
980 return -ENOPROTOOPT;
981 }
982
983 return 0;
984}
985
986
987static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
988 sockptr_t optval, unsigned int optlen)
989{
990 struct raw6_sock *rp = raw6_sk(sk);
991 int val;
992
993 if (optlen < sizeof(val))
994 return -EINVAL;
995
996 if (copy_from_sockptr(&val, optval, sizeof(val)))
997 return -EFAULT;
998
999 switch (optname) {
1000 case IPV6_HDRINCL:
1001 if (sk->sk_type != SOCK_RAW)
1002 return -EINVAL;
1003 inet_sk(sk)->hdrincl = !!val;
1004 return 0;
1005 case IPV6_CHECKSUM:
1006 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
1007 level == IPPROTO_IPV6) {
1008 /*
1009 * RFC3542 tells that IPV6_CHECKSUM socket
1010 * option in the IPPROTO_IPV6 level is not
1011 * allowed on ICMPv6 sockets.
1012 * If you want to set it, use IPPROTO_RAW
1013 * level IPV6_CHECKSUM socket option
1014 * (Linux extension).
1015 */
1016 return -EINVAL;
1017 }
1018
1019 /* You may get strange result with a positive odd offset;
1020 RFC2292bis agrees with me. */
1021 if (val > 0 && (val&1))
1022 return -EINVAL;
1023 if (val < 0) {
1024 rp->checksum = 0;
1025 } else {
1026 rp->checksum = 1;
1027 rp->offset = val;
1028 }
1029
1030 return 0;
1031
1032 default:
1033 return -ENOPROTOOPT;
1034 }
1035}
1036
1037static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1038 sockptr_t optval, unsigned int optlen)
1039{
1040 switch (level) {
1041 case SOL_RAW:
1042 break;
1043
1044 case SOL_ICMPV6:
1045 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1046 return -EOPNOTSUPP;
1047 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1048 case SOL_IPV6:
1049 if (optname == IPV6_CHECKSUM ||
1050 optname == IPV6_HDRINCL)
1051 break;
1052 fallthrough;
1053 default:
1054 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1055 }
1056
1057 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1058}
1059
1060static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1061 char __user *optval, int __user *optlen)
1062{
1063 struct raw6_sock *rp = raw6_sk(sk);
1064 int val, len;
1065
1066 if (get_user(len, optlen))
1067 return -EFAULT;
1068
1069 switch (optname) {
1070 case IPV6_HDRINCL:
1071 val = inet_sk(sk)->hdrincl;
1072 break;
1073 case IPV6_CHECKSUM:
1074 /*
1075 * We allow getsockopt() for IPPROTO_IPV6-level
1076 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1077 * since RFC3542 is silent about it.
1078 */
1079 if (rp->checksum == 0)
1080 val = -1;
1081 else
1082 val = rp->offset;
1083 break;
1084
1085 default:
1086 return -ENOPROTOOPT;
1087 }
1088
1089 len = min_t(unsigned int, sizeof(int), len);
1090
1091 if (put_user(len, optlen))
1092 return -EFAULT;
1093 if (copy_to_user(optval, &val, len))
1094 return -EFAULT;
1095 return 0;
1096}
1097
1098static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1099 char __user *optval, int __user *optlen)
1100{
1101 switch (level) {
1102 case SOL_RAW:
1103 break;
1104
1105 case SOL_ICMPV6:
1106 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1107 return -EOPNOTSUPP;
1108 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1109 case SOL_IPV6:
1110 if (optname == IPV6_CHECKSUM ||
1111 optname == IPV6_HDRINCL)
1112 break;
1113 fallthrough;
1114 default:
1115 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1116 }
1117
1118 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1119}
1120
1121static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1122{
1123 switch (cmd) {
1124 case SIOCOUTQ: {
1125 int amount = sk_wmem_alloc_get(sk);
1126
1127 return put_user(amount, (int __user *)arg);
1128 }
1129 case SIOCINQ: {
1130 struct sk_buff *skb;
1131 int amount = 0;
1132
1133 spin_lock_bh(&sk->sk_receive_queue.lock);
1134 skb = skb_peek(&sk->sk_receive_queue);
1135 if (skb)
1136 amount = skb->len;
1137 spin_unlock_bh(&sk->sk_receive_queue.lock);
1138 return put_user(amount, (int __user *)arg);
1139 }
1140
1141 default:
1142#ifdef CONFIG_IPV6_MROUTE
1143 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1144#else
1145 return -ENOIOCTLCMD;
1146#endif
1147 }
1148}
1149
1150#ifdef CONFIG_COMPAT
1151static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1152{
1153 switch (cmd) {
1154 case SIOCOUTQ:
1155 case SIOCINQ:
1156 return -ENOIOCTLCMD;
1157 default:
1158#ifdef CONFIG_IPV6_MROUTE
1159 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1160#else
1161 return -ENOIOCTLCMD;
1162#endif
1163 }
1164}
1165#endif
1166
1167static void rawv6_close(struct sock *sk, long timeout)
1168{
1169 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1170 ip6_ra_control(sk, -1);
1171 ip6mr_sk_done(sk);
1172 sk_common_release(sk);
1173}
1174
1175static void raw6_destroy(struct sock *sk)
1176{
1177 lock_sock(sk);
1178 ip6_flush_pending_frames(sk);
1179 release_sock(sk);
1180}
1181
1182static int rawv6_init_sk(struct sock *sk)
1183{
1184 struct raw6_sock *rp = raw6_sk(sk);
1185
1186 switch (inet_sk(sk)->inet_num) {
1187 case IPPROTO_ICMPV6:
1188 rp->checksum = 1;
1189 rp->offset = 2;
1190 break;
1191 case IPPROTO_MH:
1192 rp->checksum = 1;
1193 rp->offset = 4;
1194 break;
1195 default:
1196 break;
1197 }
1198 return 0;
1199}
1200
1201struct proto rawv6_prot = {
1202 .name = "RAWv6",
1203 .owner = THIS_MODULE,
1204 .close = rawv6_close,
1205 .destroy = raw6_destroy,
1206 .connect = ip6_datagram_connect_v6_only,
1207 .disconnect = __udp_disconnect,
1208 .ioctl = rawv6_ioctl,
1209 .init = rawv6_init_sk,
1210 .setsockopt = rawv6_setsockopt,
1211 .getsockopt = rawv6_getsockopt,
1212 .sendmsg = rawv6_sendmsg,
1213 .recvmsg = rawv6_recvmsg,
1214 .bind = rawv6_bind,
1215 .backlog_rcv = rawv6_rcv_skb,
1216 .hash = raw_hash_sk,
1217 .unhash = raw_unhash_sk,
1218 .obj_size = sizeof(struct raw6_sock),
1219 .useroffset = offsetof(struct raw6_sock, filter),
1220 .usersize = sizeof_field(struct raw6_sock, filter),
1221 .h.raw_hash = &raw_v6_hashinfo,
1222#ifdef CONFIG_COMPAT
1223 .compat_ioctl = compat_rawv6_ioctl,
1224#endif
1225 .diag_destroy = raw_abort,
1226};
1227
1228#ifdef CONFIG_PROC_FS
1229static int raw6_seq_show(struct seq_file *seq, void *v)
1230{
1231 if (v == SEQ_START_TOKEN) {
1232 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1233 } else {
1234 struct sock *sp = v;
1235 __u16 srcp = inet_sk(sp)->inet_num;
1236 ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1237 raw_seq_private(seq)->bucket);
1238 }
1239 return 0;
1240}
1241
1242static const struct seq_operations raw6_seq_ops = {
1243 .start = raw_seq_start,
1244 .next = raw_seq_next,
1245 .stop = raw_seq_stop,
1246 .show = raw6_seq_show,
1247};
1248
1249static int __net_init raw6_init_net(struct net *net)
1250{
1251 if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops,
1252 sizeof(struct raw_iter_state), &raw_v6_hashinfo))
1253 return -ENOMEM;
1254
1255 return 0;
1256}
1257
1258static void __net_exit raw6_exit_net(struct net *net)
1259{
1260 remove_proc_entry("raw6", net->proc_net);
1261}
1262
1263static struct pernet_operations raw6_net_ops = {
1264 .init = raw6_init_net,
1265 .exit = raw6_exit_net,
1266};
1267
1268int __init raw6_proc_init(void)
1269{
1270 return register_pernet_subsys(&raw6_net_ops);
1271}
1272
1273void raw6_proc_exit(void)
1274{
1275 unregister_pernet_subsys(&raw6_net_ops);
1276}
1277#endif /* CONFIG_PROC_FS */
1278
1279/* Same as inet6_dgram_ops, sans udp_poll. */
1280const struct proto_ops inet6_sockraw_ops = {
1281 .family = PF_INET6,
1282 .owner = THIS_MODULE,
1283 .release = inet6_release,
1284 .bind = inet6_bind,
1285 .connect = inet_dgram_connect, /* ok */
1286 .socketpair = sock_no_socketpair, /* a do nothing */
1287 .accept = sock_no_accept, /* a do nothing */
1288 .getname = inet6_getname,
1289 .poll = datagram_poll, /* ok */
1290 .ioctl = inet6_ioctl, /* must change */
1291 .gettstamp = sock_gettstamp,
1292 .listen = sock_no_listen, /* ok */
1293 .shutdown = inet_shutdown, /* ok */
1294 .setsockopt = sock_common_setsockopt, /* ok */
1295 .getsockopt = sock_common_getsockopt, /* ok */
1296 .sendmsg = inet_sendmsg, /* ok */
1297 .recvmsg = sock_common_recvmsg, /* ok */
1298 .mmap = sock_no_mmap,
1299 .sendpage = sock_no_sendpage,
1300#ifdef CONFIG_COMPAT
1301 .compat_ioctl = inet6_compat_ioctl,
1302#endif
1303};
1304
1305static struct inet_protosw rawv6_protosw = {
1306 .type = SOCK_RAW,
1307 .protocol = IPPROTO_IP, /* wild card */
1308 .prot = &rawv6_prot,
1309 .ops = &inet6_sockraw_ops,
1310 .flags = INET_PROTOSW_REUSE,
1311};
1312
1313int __init rawv6_init(void)
1314{
1315 return inet6_register_protosw(&rawv6_protosw);
1316}
1317
1318void rawv6_exit(void)
1319{
1320 inet6_unregister_protosw(&rawv6_protosw);
1321}