Loading...
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}
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}