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1/*
2 * RAW sockets for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Adapted from linux/net/ipv4/raw.c
9 *
10 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance)
13 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 */
20
21#include <linux/errno.h>
22#include <linux/types.h>
23#include <linux/socket.h>
24#include <linux/slab.h>
25#include <linux/sockios.h>
26#include <linux/net.h>
27#include <linux/in6.h>
28#include <linux/netdevice.h>
29#include <linux/if_arp.h>
30#include <linux/icmpv6.h>
31#include <linux/netfilter.h>
32#include <linux/netfilter_ipv6.h>
33#include <linux/skbuff.h>
34#include <linux/compat.h>
35#include <asm/uaccess.h>
36#include <asm/ioctls.h>
37
38#include <net/net_namespace.h>
39#include <net/ip.h>
40#include <net/sock.h>
41#include <net/snmp.h>
42
43#include <net/ipv6.h>
44#include <net/ndisc.h>
45#include <net/protocol.h>
46#include <net/ip6_route.h>
47#include <net/ip6_checksum.h>
48#include <net/addrconf.h>
49#include <net/transp_v6.h>
50#include <net/udp.h>
51#include <net/inet_common.h>
52#include <net/tcp_states.h>
53#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
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
65static struct raw_hashinfo raw_v6_hashinfo = {
66 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
67};
68
69static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
70 unsigned short num, const struct in6_addr *loc_addr,
71 const struct in6_addr *rmt_addr, int dif)
72{
73 struct hlist_node *node;
74 int is_multicast = ipv6_addr_is_multicast(loc_addr);
75
76 sk_for_each_from(sk, node)
77 if (inet_sk(sk)->inet_num == num) {
78 struct ipv6_pinfo *np = inet6_sk(sk);
79
80 if (!net_eq(sock_net(sk), net))
81 continue;
82
83 if (!ipv6_addr_any(&np->daddr) &&
84 !ipv6_addr_equal(&np->daddr, rmt_addr))
85 continue;
86
87 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
88 continue;
89
90 if (!ipv6_addr_any(&np->rcv_saddr)) {
91 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
92 goto found;
93 if (is_multicast &&
94 inet6_mc_check(sk, loc_addr, rmt_addr))
95 goto found;
96 continue;
97 }
98 goto found;
99 }
100 sk = NULL;
101found:
102 return sk;
103}
104
105/*
106 * 0 - deliver
107 * 1 - block
108 */
109static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb)
110{
111 struct icmp6hdr *icmph;
112 struct raw6_sock *rp = raw6_sk(sk);
113
114 if (pskb_may_pull(skb, sizeof(struct icmp6hdr))) {
115 __u32 *data = &rp->filter.data[0];
116 int bit_nr;
117
118 icmph = (struct icmp6hdr *) skb->data;
119 bit_nr = icmph->icmp6_type;
120
121 return (data[bit_nr >> 5] & (1 << (bit_nr & 31))) != 0;
122 }
123 return 0;
124}
125
126#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
127typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
128
129static mh_filter_t __rcu *mh_filter __read_mostly;
130
131int rawv6_mh_filter_register(mh_filter_t filter)
132{
133 rcu_assign_pointer(mh_filter, filter);
134 return 0;
135}
136EXPORT_SYMBOL(rawv6_mh_filter_register);
137
138int rawv6_mh_filter_unregister(mh_filter_t filter)
139{
140 rcu_assign_pointer(mh_filter, NULL);
141 synchronize_rcu();
142 return 0;
143}
144EXPORT_SYMBOL(rawv6_mh_filter_unregister);
145
146#endif
147
148/*
149 * demultiplex raw sockets.
150 * (should consider queueing the skb in the sock receive_queue
151 * without calling rawv6.c)
152 *
153 * Caller owns SKB so we must make clones.
154 */
155static int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
156{
157 const struct in6_addr *saddr;
158 const struct in6_addr *daddr;
159 struct sock *sk;
160 int delivered = 0;
161 __u8 hash;
162 struct net *net;
163
164 saddr = &ipv6_hdr(skb)->saddr;
165 daddr = saddr + 1;
166
167 hash = nexthdr & (MAX_INET_PROTOS - 1);
168
169 read_lock(&raw_v6_hashinfo.lock);
170 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
171
172 if (sk == NULL)
173 goto out;
174
175 net = dev_net(skb->dev);
176 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
177
178 while (sk) {
179 int filtered;
180
181 delivered = 1;
182 switch (nexthdr) {
183 case IPPROTO_ICMPV6:
184 filtered = icmpv6_filter(sk, skb);
185 break;
186
187#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
188 case IPPROTO_MH:
189 {
190 /* XXX: To validate MH only once for each packet,
191 * this is placed here. It should be after checking
192 * xfrm policy, however it doesn't. The checking xfrm
193 * policy is placed in rawv6_rcv() because it is
194 * required for each socket.
195 */
196 mh_filter_t *filter;
197
198 filter = rcu_dereference(mh_filter);
199 filtered = filter ? (*filter)(sk, skb) : 0;
200 break;
201 }
202#endif
203 default:
204 filtered = 0;
205 break;
206 }
207
208 if (filtered < 0)
209 break;
210 if (filtered == 0) {
211 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
212
213 /* Not releasing hash table! */
214 if (clone) {
215 nf_reset(clone);
216 rawv6_rcv(sk, clone);
217 }
218 }
219 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
220 IP6CB(skb)->iif);
221 }
222out:
223 read_unlock(&raw_v6_hashinfo.lock);
224 return delivered;
225}
226
227int raw6_local_deliver(struct sk_buff *skb, int nexthdr)
228{
229 struct sock *raw_sk;
230
231 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (MAX_INET_PROTOS - 1)]);
232 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
233 raw_sk = NULL;
234
235 return raw_sk != NULL;
236}
237
238/* This cleans up af_inet6 a bit. -DaveM */
239static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
240{
241 struct inet_sock *inet = inet_sk(sk);
242 struct ipv6_pinfo *np = inet6_sk(sk);
243 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
244 __be32 v4addr = 0;
245 int addr_type;
246 int err;
247
248 if (addr_len < SIN6_LEN_RFC2133)
249 return -EINVAL;
250 addr_type = ipv6_addr_type(&addr->sin6_addr);
251
252 /* Raw sockets are IPv6 only */
253 if (addr_type == IPV6_ADDR_MAPPED)
254 return -EADDRNOTAVAIL;
255
256 lock_sock(sk);
257
258 err = -EINVAL;
259 if (sk->sk_state != TCP_CLOSE)
260 goto out;
261
262 rcu_read_lock();
263 /* Check if the address belongs to the host. */
264 if (addr_type != IPV6_ADDR_ANY) {
265 struct net_device *dev = NULL;
266
267 if (addr_type & IPV6_ADDR_LINKLOCAL) {
268 if (addr_len >= sizeof(struct sockaddr_in6) &&
269 addr->sin6_scope_id) {
270 /* Override any existing binding, if another
271 * one is supplied by user.
272 */
273 sk->sk_bound_dev_if = addr->sin6_scope_id;
274 }
275
276 /* Binding to link-local address requires an interface */
277 if (!sk->sk_bound_dev_if)
278 goto out_unlock;
279
280 err = -ENODEV;
281 dev = dev_get_by_index_rcu(sock_net(sk),
282 sk->sk_bound_dev_if);
283 if (!dev)
284 goto out_unlock;
285 }
286
287 /* ipv4 addr of the socket is invalid. Only the
288 * unspecified and mapped address have a v4 equivalent.
289 */
290 v4addr = LOOPBACK4_IPV6;
291 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
292 err = -EADDRNOTAVAIL;
293 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
294 dev, 0)) {
295 goto out_unlock;
296 }
297 }
298 }
299
300 inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
301 ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
302 if (!(addr_type & IPV6_ADDR_MULTICAST))
303 ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
304 err = 0;
305out_unlock:
306 rcu_read_unlock();
307out:
308 release_sock(sk);
309 return err;
310}
311
312static void rawv6_err(struct sock *sk, struct sk_buff *skb,
313 struct inet6_skb_parm *opt,
314 u8 type, u8 code, int offset, __be32 info)
315{
316 struct inet_sock *inet = inet_sk(sk);
317 struct ipv6_pinfo *np = inet6_sk(sk);
318 int err;
319 int harderr;
320
321 /* Report error on raw socket, if:
322 1. User requested recverr.
323 2. Socket is connected (otherwise the error indication
324 is useless without recverr and error is hard.
325 */
326 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
327 return;
328
329 harderr = icmpv6_err_convert(type, code, &err);
330 if (type == ICMPV6_PKT_TOOBIG)
331 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
332
333 if (np->recverr) {
334 u8 *payload = skb->data;
335 if (!inet->hdrincl)
336 payload += offset;
337 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
338 }
339
340 if (np->recverr || harderr) {
341 sk->sk_err = err;
342 sk->sk_error_report(sk);
343 }
344}
345
346void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
347 u8 type, u8 code, int inner_offset, __be32 info)
348{
349 struct sock *sk;
350 int hash;
351 const struct in6_addr *saddr, *daddr;
352 struct net *net;
353
354 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
355
356 read_lock(&raw_v6_hashinfo.lock);
357 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
358 if (sk != NULL) {
359 /* Note: ipv6_hdr(skb) != skb->data */
360 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
361 saddr = &ip6h->saddr;
362 daddr = &ip6h->daddr;
363 net = dev_net(skb->dev);
364
365 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
366 IP6CB(skb)->iif))) {
367 rawv6_err(sk, skb, NULL, type, code,
368 inner_offset, info);
369 sk = sk_next(sk);
370 }
371 }
372 read_unlock(&raw_v6_hashinfo.lock);
373}
374
375static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
376{
377 if ((raw6_sk(sk)->checksum || rcu_dereference_raw(sk->sk_filter)) &&
378 skb_checksum_complete(skb)) {
379 atomic_inc(&sk->sk_drops);
380 kfree_skb(skb);
381 return NET_RX_DROP;
382 }
383
384 /* Charge it to the socket. */
385 if (ip_queue_rcv_skb(sk, skb) < 0) {
386 kfree_skb(skb);
387 return NET_RX_DROP;
388 }
389
390 return 0;
391}
392
393/*
394 * This is next to useless...
395 * if we demultiplex in network layer we don't need the extra call
396 * just to queue the skb...
397 * maybe we could have the network decide upon a hint if it
398 * should call raw_rcv for demultiplexing
399 */
400int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
401{
402 struct inet_sock *inet = inet_sk(sk);
403 struct raw6_sock *rp = raw6_sk(sk);
404
405 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
406 atomic_inc(&sk->sk_drops);
407 kfree_skb(skb);
408 return NET_RX_DROP;
409 }
410
411 if (!rp->checksum)
412 skb->ip_summed = CHECKSUM_UNNECESSARY;
413
414 if (skb->ip_summed == CHECKSUM_COMPLETE) {
415 skb_postpull_rcsum(skb, skb_network_header(skb),
416 skb_network_header_len(skb));
417 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
418 &ipv6_hdr(skb)->daddr,
419 skb->len, inet->inet_num, skb->csum))
420 skb->ip_summed = CHECKSUM_UNNECESSARY;
421 }
422 if (!skb_csum_unnecessary(skb))
423 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
424 &ipv6_hdr(skb)->daddr,
425 skb->len,
426 inet->inet_num, 0));
427
428 if (inet->hdrincl) {
429 if (skb_checksum_complete(skb)) {
430 atomic_inc(&sk->sk_drops);
431 kfree_skb(skb);
432 return NET_RX_DROP;
433 }
434 }
435
436 rawv6_rcv_skb(sk, skb);
437 return 0;
438}
439
440
441/*
442 * This should be easy, if there is something there
443 * we return it, otherwise we block.
444 */
445
446static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
447 struct msghdr *msg, size_t len,
448 int noblock, int flags, int *addr_len)
449{
450 struct ipv6_pinfo *np = inet6_sk(sk);
451 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
452 struct sk_buff *skb;
453 size_t copied;
454 int err;
455
456 if (flags & MSG_OOB)
457 return -EOPNOTSUPP;
458
459 if (addr_len)
460 *addr_len=sizeof(*sin6);
461
462 if (flags & MSG_ERRQUEUE)
463 return ipv6_recv_error(sk, msg, len);
464
465 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
466 return ipv6_recv_rxpmtu(sk, msg, len);
467
468 skb = skb_recv_datagram(sk, flags, noblock, &err);
469 if (!skb)
470 goto out;
471
472 copied = skb->len;
473 if (copied > len) {
474 copied = len;
475 msg->msg_flags |= MSG_TRUNC;
476 }
477
478 if (skb_csum_unnecessary(skb)) {
479 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
480 } else if (msg->msg_flags&MSG_TRUNC) {
481 if (__skb_checksum_complete(skb))
482 goto csum_copy_err;
483 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
484 } else {
485 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
486 if (err == -EINVAL)
487 goto csum_copy_err;
488 }
489 if (err)
490 goto out_free;
491
492 /* Copy the address. */
493 if (sin6) {
494 sin6->sin6_family = AF_INET6;
495 sin6->sin6_port = 0;
496 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
497 sin6->sin6_flowinfo = 0;
498 sin6->sin6_scope_id = 0;
499 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
500 sin6->sin6_scope_id = IP6CB(skb)->iif;
501 }
502
503 sock_recv_ts_and_drops(msg, sk, skb);
504
505 if (np->rxopt.all)
506 datagram_recv_ctl(sk, msg, skb);
507
508 err = copied;
509 if (flags & MSG_TRUNC)
510 err = skb->len;
511
512out_free:
513 skb_free_datagram(sk, skb);
514out:
515 return err;
516
517csum_copy_err:
518 skb_kill_datagram(sk, skb, flags);
519
520 /* Error for blocking case is chosen to masquerade
521 as some normal condition.
522 */
523 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
524 goto out;
525}
526
527static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
528 struct raw6_sock *rp)
529{
530 struct sk_buff *skb;
531 int err = 0;
532 int offset;
533 int len;
534 int total_len;
535 __wsum tmp_csum;
536 __sum16 csum;
537
538 if (!rp->checksum)
539 goto send;
540
541 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
542 goto out;
543
544 offset = rp->offset;
545 total_len = inet_sk(sk)->cork.base.length - (skb_network_header(skb) -
546 skb->data);
547 if (offset >= total_len - 1) {
548 err = -EINVAL;
549 ip6_flush_pending_frames(sk);
550 goto out;
551 }
552
553 /* should be check HW csum miyazawa */
554 if (skb_queue_len(&sk->sk_write_queue) == 1) {
555 /*
556 * Only one fragment on the socket.
557 */
558 tmp_csum = skb->csum;
559 } else {
560 struct sk_buff *csum_skb = NULL;
561 tmp_csum = 0;
562
563 skb_queue_walk(&sk->sk_write_queue, skb) {
564 tmp_csum = csum_add(tmp_csum, skb->csum);
565
566 if (csum_skb)
567 continue;
568
569 len = skb->len - skb_transport_offset(skb);
570 if (offset >= len) {
571 offset -= len;
572 continue;
573 }
574
575 csum_skb = skb;
576 }
577
578 skb = csum_skb;
579 }
580
581 offset += skb_transport_offset(skb);
582 if (skb_copy_bits(skb, offset, &csum, 2))
583 BUG();
584
585 /* in case cksum was not initialized */
586 if (unlikely(csum))
587 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
588
589 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
590 total_len, fl6->flowi6_proto, tmp_csum);
591
592 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
593 csum = CSUM_MANGLED_0;
594
595 if (skb_store_bits(skb, offset, &csum, 2))
596 BUG();
597
598send:
599 err = ip6_push_pending_frames(sk);
600out:
601 return err;
602}
603
604static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
605 struct flowi6 *fl6, struct dst_entry **dstp,
606 unsigned int flags)
607{
608 struct ipv6_pinfo *np = inet6_sk(sk);
609 struct ipv6hdr *iph;
610 struct sk_buff *skb;
611 int err;
612 struct rt6_info *rt = (struct rt6_info *)*dstp;
613
614 if (length > rt->dst.dev->mtu) {
615 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
616 return -EMSGSIZE;
617 }
618 if (flags&MSG_PROBE)
619 goto out;
620
621 skb = sock_alloc_send_skb(sk,
622 length + LL_ALLOCATED_SPACE(rt->dst.dev) + 15,
623 flags & MSG_DONTWAIT, &err);
624 if (skb == NULL)
625 goto error;
626 skb_reserve(skb, LL_RESERVED_SPACE(rt->dst.dev));
627
628 skb->priority = sk->sk_priority;
629 skb->mark = sk->sk_mark;
630 skb_dst_set(skb, &rt->dst);
631 *dstp = NULL;
632
633 skb_put(skb, length);
634 skb_reset_network_header(skb);
635 iph = ipv6_hdr(skb);
636
637 skb->ip_summed = CHECKSUM_NONE;
638
639 skb->transport_header = skb->network_header;
640 err = memcpy_fromiovecend((void *)iph, from, 0, length);
641 if (err)
642 goto error_fault;
643
644 IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
645 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
646 rt->dst.dev, dst_output);
647 if (err > 0)
648 err = net_xmit_errno(err);
649 if (err)
650 goto error;
651out:
652 return 0;
653
654error_fault:
655 err = -EFAULT;
656 kfree_skb(skb);
657error:
658 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
659 if (err == -ENOBUFS && !np->recverr)
660 err = 0;
661 return err;
662}
663
664static int rawv6_probe_proto_opt(struct flowi6 *fl6, struct msghdr *msg)
665{
666 struct iovec *iov;
667 u8 __user *type = NULL;
668 u8 __user *code = NULL;
669 u8 len = 0;
670 int probed = 0;
671 int i;
672
673 if (!msg->msg_iov)
674 return 0;
675
676 for (i = 0; i < msg->msg_iovlen; i++) {
677 iov = &msg->msg_iov[i];
678 if (!iov)
679 continue;
680
681 switch (fl6->flowi6_proto) {
682 case IPPROTO_ICMPV6:
683 /* check if one-byte field is readable or not. */
684 if (iov->iov_base && iov->iov_len < 1)
685 break;
686
687 if (!type) {
688 type = iov->iov_base;
689 /* check if code field is readable or not. */
690 if (iov->iov_len > 1)
691 code = type + 1;
692 } else if (!code)
693 code = iov->iov_base;
694
695 if (type && code) {
696 if (get_user(fl6->fl6_icmp_type, type) ||
697 get_user(fl6->fl6_icmp_code, code))
698 return -EFAULT;
699 probed = 1;
700 }
701 break;
702 case IPPROTO_MH:
703 if (iov->iov_base && iov->iov_len < 1)
704 break;
705 /* check if type field is readable or not. */
706 if (iov->iov_len > 2 - len) {
707 u8 __user *p = iov->iov_base;
708 if (get_user(fl6->fl6_mh_type, &p[2 - len]))
709 return -EFAULT;
710 probed = 1;
711 } else
712 len += iov->iov_len;
713
714 break;
715 default:
716 probed = 1;
717 break;
718 }
719 if (probed)
720 break;
721 }
722 return 0;
723}
724
725static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
726 struct msghdr *msg, size_t len)
727{
728 struct ipv6_txoptions opt_space;
729 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
730 struct in6_addr *daddr, *final_p, final;
731 struct inet_sock *inet = inet_sk(sk);
732 struct ipv6_pinfo *np = inet6_sk(sk);
733 struct raw6_sock *rp = raw6_sk(sk);
734 struct ipv6_txoptions *opt = NULL;
735 struct ip6_flowlabel *flowlabel = NULL;
736 struct dst_entry *dst = NULL;
737 struct flowi6 fl6;
738 int addr_len = msg->msg_namelen;
739 int hlimit = -1;
740 int tclass = -1;
741 int dontfrag = -1;
742 u16 proto;
743 int err;
744
745 /* Rough check on arithmetic overflow,
746 better check is made in ip6_append_data().
747 */
748 if (len > INT_MAX)
749 return -EMSGSIZE;
750
751 /* Mirror BSD error message compatibility */
752 if (msg->msg_flags & MSG_OOB)
753 return -EOPNOTSUPP;
754
755 /*
756 * Get and verify the address.
757 */
758 memset(&fl6, 0, sizeof(fl6));
759
760 fl6.flowi6_mark = sk->sk_mark;
761
762 if (sin6) {
763 if (addr_len < SIN6_LEN_RFC2133)
764 return -EINVAL;
765
766 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
767 return -EAFNOSUPPORT;
768
769 /* port is the proto value [0..255] carried in nexthdr */
770 proto = ntohs(sin6->sin6_port);
771
772 if (!proto)
773 proto = inet->inet_num;
774 else if (proto != inet->inet_num)
775 return -EINVAL;
776
777 if (proto > 255)
778 return -EINVAL;
779
780 daddr = &sin6->sin6_addr;
781 if (np->sndflow) {
782 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
783 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
784 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
785 if (flowlabel == NULL)
786 return -EINVAL;
787 daddr = &flowlabel->dst;
788 }
789 }
790
791 /*
792 * Otherwise it will be difficult to maintain
793 * sk->sk_dst_cache.
794 */
795 if (sk->sk_state == TCP_ESTABLISHED &&
796 ipv6_addr_equal(daddr, &np->daddr))
797 daddr = &np->daddr;
798
799 if (addr_len >= sizeof(struct sockaddr_in6) &&
800 sin6->sin6_scope_id &&
801 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
802 fl6.flowi6_oif = sin6->sin6_scope_id;
803 } else {
804 if (sk->sk_state != TCP_ESTABLISHED)
805 return -EDESTADDRREQ;
806
807 proto = inet->inet_num;
808 daddr = &np->daddr;
809 fl6.flowlabel = np->flow_label;
810 }
811
812 if (fl6.flowi6_oif == 0)
813 fl6.flowi6_oif = sk->sk_bound_dev_if;
814
815 if (msg->msg_controllen) {
816 opt = &opt_space;
817 memset(opt, 0, sizeof(struct ipv6_txoptions));
818 opt->tot_len = sizeof(struct ipv6_txoptions);
819
820 err = datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
821 &hlimit, &tclass, &dontfrag);
822 if (err < 0) {
823 fl6_sock_release(flowlabel);
824 return err;
825 }
826 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
827 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
828 if (flowlabel == NULL)
829 return -EINVAL;
830 }
831 if (!(opt->opt_nflen|opt->opt_flen))
832 opt = NULL;
833 }
834 if (opt == NULL)
835 opt = np->opt;
836 if (flowlabel)
837 opt = fl6_merge_options(&opt_space, flowlabel, opt);
838 opt = ipv6_fixup_options(&opt_space, opt);
839
840 fl6.flowi6_proto = proto;
841 err = rawv6_probe_proto_opt(&fl6, msg);
842 if (err)
843 goto out;
844
845 if (!ipv6_addr_any(daddr))
846 ipv6_addr_copy(&fl6.daddr, daddr);
847 else
848 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
849 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
850 ipv6_addr_copy(&fl6.saddr, &np->saddr);
851
852 final_p = fl6_update_dst(&fl6, opt, &final);
853
854 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
855 fl6.flowi6_oif = np->mcast_oif;
856 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
857
858 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
859 if (IS_ERR(dst)) {
860 err = PTR_ERR(dst);
861 goto out;
862 }
863 if (hlimit < 0) {
864 if (ipv6_addr_is_multicast(&fl6.daddr))
865 hlimit = np->mcast_hops;
866 else
867 hlimit = np->hop_limit;
868 if (hlimit < 0)
869 hlimit = ip6_dst_hoplimit(dst);
870 }
871
872 if (tclass < 0)
873 tclass = np->tclass;
874
875 if (dontfrag < 0)
876 dontfrag = np->dontfrag;
877
878 if (msg->msg_flags&MSG_CONFIRM)
879 goto do_confirm;
880
881back_from_confirm:
882 if (inet->hdrincl)
883 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl6, &dst, msg->msg_flags);
884 else {
885 lock_sock(sk);
886 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
887 len, 0, hlimit, tclass, opt, &fl6, (struct rt6_info*)dst,
888 msg->msg_flags, dontfrag);
889
890 if (err)
891 ip6_flush_pending_frames(sk);
892 else if (!(msg->msg_flags & MSG_MORE))
893 err = rawv6_push_pending_frames(sk, &fl6, rp);
894 release_sock(sk);
895 }
896done:
897 dst_release(dst);
898out:
899 fl6_sock_release(flowlabel);
900 return err<0?err:len;
901do_confirm:
902 dst_confirm(dst);
903 if (!(msg->msg_flags & MSG_PROBE) || len)
904 goto back_from_confirm;
905 err = 0;
906 goto done;
907}
908
909static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
910 char __user *optval, int optlen)
911{
912 switch (optname) {
913 case ICMPV6_FILTER:
914 if (optlen > sizeof(struct icmp6_filter))
915 optlen = sizeof(struct icmp6_filter);
916 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
917 return -EFAULT;
918 return 0;
919 default:
920 return -ENOPROTOOPT;
921 }
922
923 return 0;
924}
925
926static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
927 char __user *optval, int __user *optlen)
928{
929 int len;
930
931 switch (optname) {
932 case ICMPV6_FILTER:
933 if (get_user(len, optlen))
934 return -EFAULT;
935 if (len < 0)
936 return -EINVAL;
937 if (len > sizeof(struct icmp6_filter))
938 len = sizeof(struct icmp6_filter);
939 if (put_user(len, optlen))
940 return -EFAULT;
941 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
942 return -EFAULT;
943 return 0;
944 default:
945 return -ENOPROTOOPT;
946 }
947
948 return 0;
949}
950
951
952static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
953 char __user *optval, unsigned int optlen)
954{
955 struct raw6_sock *rp = raw6_sk(sk);
956 int val;
957
958 if (get_user(val, (int __user *)optval))
959 return -EFAULT;
960
961 switch (optname) {
962 case IPV6_CHECKSUM:
963 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
964 level == IPPROTO_IPV6) {
965 /*
966 * RFC3542 tells that IPV6_CHECKSUM socket
967 * option in the IPPROTO_IPV6 level is not
968 * allowed on ICMPv6 sockets.
969 * If you want to set it, use IPPROTO_RAW
970 * level IPV6_CHECKSUM socket option
971 * (Linux extension).
972 */
973 return -EINVAL;
974 }
975
976 /* You may get strange result with a positive odd offset;
977 RFC2292bis agrees with me. */
978 if (val > 0 && (val&1))
979 return -EINVAL;
980 if (val < 0) {
981 rp->checksum = 0;
982 } else {
983 rp->checksum = 1;
984 rp->offset = val;
985 }
986
987 return 0;
988
989 default:
990 return -ENOPROTOOPT;
991 }
992}
993
994static int rawv6_setsockopt(struct sock *sk, int level, int optname,
995 char __user *optval, unsigned int optlen)
996{
997 switch (level) {
998 case SOL_RAW:
999 break;
1000
1001 case SOL_ICMPV6:
1002 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1003 return -EOPNOTSUPP;
1004 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1005 case SOL_IPV6:
1006 if (optname == IPV6_CHECKSUM)
1007 break;
1008 default:
1009 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1010 }
1011
1012 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1013}
1014
1015#ifdef CONFIG_COMPAT
1016static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1017 char __user *optval, unsigned int optlen)
1018{
1019 switch (level) {
1020 case SOL_RAW:
1021 break;
1022 case SOL_ICMPV6:
1023 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1024 return -EOPNOTSUPP;
1025 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1026 case SOL_IPV6:
1027 if (optname == IPV6_CHECKSUM)
1028 break;
1029 default:
1030 return compat_ipv6_setsockopt(sk, level, optname,
1031 optval, optlen);
1032 }
1033 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1034}
1035#endif
1036
1037static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1038 char __user *optval, int __user *optlen)
1039{
1040 struct raw6_sock *rp = raw6_sk(sk);
1041 int val, len;
1042
1043 if (get_user(len,optlen))
1044 return -EFAULT;
1045
1046 switch (optname) {
1047 case IPV6_CHECKSUM:
1048 /*
1049 * We allow getsockopt() for IPPROTO_IPV6-level
1050 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1051 * since RFC3542 is silent about it.
1052 */
1053 if (rp->checksum == 0)
1054 val = -1;
1055 else
1056 val = rp->offset;
1057 break;
1058
1059 default:
1060 return -ENOPROTOOPT;
1061 }
1062
1063 len = min_t(unsigned int, sizeof(int), len);
1064
1065 if (put_user(len, optlen))
1066 return -EFAULT;
1067 if (copy_to_user(optval,&val,len))
1068 return -EFAULT;
1069 return 0;
1070}
1071
1072static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1073 char __user *optval, int __user *optlen)
1074{
1075 switch (level) {
1076 case SOL_RAW:
1077 break;
1078
1079 case SOL_ICMPV6:
1080 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1081 return -EOPNOTSUPP;
1082 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1083 case SOL_IPV6:
1084 if (optname == IPV6_CHECKSUM)
1085 break;
1086 default:
1087 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1088 }
1089
1090 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1091}
1092
1093#ifdef CONFIG_COMPAT
1094static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1095 char __user *optval, int __user *optlen)
1096{
1097 switch (level) {
1098 case SOL_RAW:
1099 break;
1100 case SOL_ICMPV6:
1101 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1102 return -EOPNOTSUPP;
1103 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1104 case SOL_IPV6:
1105 if (optname == IPV6_CHECKSUM)
1106 break;
1107 default:
1108 return compat_ipv6_getsockopt(sk, level, optname,
1109 optval, optlen);
1110 }
1111 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1112}
1113#endif
1114
1115static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1116{
1117 switch (cmd) {
1118 case SIOCOUTQ: {
1119 int amount = sk_wmem_alloc_get(sk);
1120
1121 return put_user(amount, (int __user *)arg);
1122 }
1123 case SIOCINQ: {
1124 struct sk_buff *skb;
1125 int amount = 0;
1126
1127 spin_lock_bh(&sk->sk_receive_queue.lock);
1128 skb = skb_peek(&sk->sk_receive_queue);
1129 if (skb != NULL)
1130 amount = skb->tail - skb->transport_header;
1131 spin_unlock_bh(&sk->sk_receive_queue.lock);
1132 return put_user(amount, (int __user *)arg);
1133 }
1134
1135 default:
1136#ifdef CONFIG_IPV6_MROUTE
1137 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1138#else
1139 return -ENOIOCTLCMD;
1140#endif
1141 }
1142}
1143
1144#ifdef CONFIG_COMPAT
1145static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1146{
1147 switch (cmd) {
1148 case SIOCOUTQ:
1149 case SIOCINQ:
1150 return -ENOIOCTLCMD;
1151 default:
1152#ifdef CONFIG_IPV6_MROUTE
1153 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1154#else
1155 return -ENOIOCTLCMD;
1156#endif
1157 }
1158}
1159#endif
1160
1161static void rawv6_close(struct sock *sk, long timeout)
1162{
1163 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1164 ip6_ra_control(sk, -1);
1165 ip6mr_sk_done(sk);
1166 sk_common_release(sk);
1167}
1168
1169static void raw6_destroy(struct sock *sk)
1170{
1171 lock_sock(sk);
1172 ip6_flush_pending_frames(sk);
1173 release_sock(sk);
1174
1175 inet6_destroy_sock(sk);
1176}
1177
1178static int rawv6_init_sk(struct sock *sk)
1179{
1180 struct raw6_sock *rp = raw6_sk(sk);
1181
1182 switch (inet_sk(sk)->inet_num) {
1183 case IPPROTO_ICMPV6:
1184 rp->checksum = 1;
1185 rp->offset = 2;
1186 break;
1187 case IPPROTO_MH:
1188 rp->checksum = 1;
1189 rp->offset = 4;
1190 break;
1191 default:
1192 break;
1193 }
1194 return 0;
1195}
1196
1197struct proto rawv6_prot = {
1198 .name = "RAWv6",
1199 .owner = THIS_MODULE,
1200 .close = rawv6_close,
1201 .destroy = raw6_destroy,
1202 .connect = ip6_datagram_connect,
1203 .disconnect = udp_disconnect,
1204 .ioctl = rawv6_ioctl,
1205 .init = rawv6_init_sk,
1206 .setsockopt = rawv6_setsockopt,
1207 .getsockopt = rawv6_getsockopt,
1208 .sendmsg = rawv6_sendmsg,
1209 .recvmsg = rawv6_recvmsg,
1210 .bind = rawv6_bind,
1211 .backlog_rcv = rawv6_rcv_skb,
1212 .hash = raw_hash_sk,
1213 .unhash = raw_unhash_sk,
1214 .obj_size = sizeof(struct raw6_sock),
1215 .h.raw_hash = &raw_v6_hashinfo,
1216#ifdef CONFIG_COMPAT
1217 .compat_setsockopt = compat_rawv6_setsockopt,
1218 .compat_getsockopt = compat_rawv6_getsockopt,
1219 .compat_ioctl = compat_rawv6_ioctl,
1220#endif
1221};
1222
1223#ifdef CONFIG_PROC_FS
1224static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1225{
1226 struct ipv6_pinfo *np = inet6_sk(sp);
1227 const struct in6_addr *dest, *src;
1228 __u16 destp, srcp;
1229
1230 dest = &np->daddr;
1231 src = &np->rcv_saddr;
1232 destp = 0;
1233 srcp = inet_sk(sp)->inet_num;
1234 seq_printf(seq,
1235 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1236 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
1237 i,
1238 src->s6_addr32[0], src->s6_addr32[1],
1239 src->s6_addr32[2], src->s6_addr32[3], srcp,
1240 dest->s6_addr32[0], dest->s6_addr32[1],
1241 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1242 sp->sk_state,
1243 sk_wmem_alloc_get(sp),
1244 sk_rmem_alloc_get(sp),
1245 0, 0L, 0,
1246 sock_i_uid(sp), 0,
1247 sock_i_ino(sp),
1248 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1249}
1250
1251static int raw6_seq_show(struct seq_file *seq, void *v)
1252{
1253 if (v == SEQ_START_TOKEN)
1254 seq_printf(seq,
1255 " sl "
1256 "local_address "
1257 "remote_address "
1258 "st tx_queue rx_queue tr tm->when retrnsmt"
1259 " uid timeout inode ref pointer drops\n");
1260 else
1261 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1262 return 0;
1263}
1264
1265static const struct seq_operations raw6_seq_ops = {
1266 .start = raw_seq_start,
1267 .next = raw_seq_next,
1268 .stop = raw_seq_stop,
1269 .show = raw6_seq_show,
1270};
1271
1272static int raw6_seq_open(struct inode *inode, struct file *file)
1273{
1274 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1275}
1276
1277static const struct file_operations raw6_seq_fops = {
1278 .owner = THIS_MODULE,
1279 .open = raw6_seq_open,
1280 .read = seq_read,
1281 .llseek = seq_lseek,
1282 .release = seq_release_net,
1283};
1284
1285static int __net_init raw6_init_net(struct net *net)
1286{
1287 if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops))
1288 return -ENOMEM;
1289
1290 return 0;
1291}
1292
1293static void __net_exit raw6_exit_net(struct net *net)
1294{
1295 proc_net_remove(net, "raw6");
1296}
1297
1298static struct pernet_operations raw6_net_ops = {
1299 .init = raw6_init_net,
1300 .exit = raw6_exit_net,
1301};
1302
1303int __init raw6_proc_init(void)
1304{
1305 return register_pernet_subsys(&raw6_net_ops);
1306}
1307
1308void raw6_proc_exit(void)
1309{
1310 unregister_pernet_subsys(&raw6_net_ops);
1311}
1312#endif /* CONFIG_PROC_FS */
1313
1314/* Same as inet6_dgram_ops, sans udp_poll. */
1315static const struct proto_ops inet6_sockraw_ops = {
1316 .family = PF_INET6,
1317 .owner = THIS_MODULE,
1318 .release = inet6_release,
1319 .bind = inet6_bind,
1320 .connect = inet_dgram_connect, /* ok */
1321 .socketpair = sock_no_socketpair, /* a do nothing */
1322 .accept = sock_no_accept, /* a do nothing */
1323 .getname = inet6_getname,
1324 .poll = datagram_poll, /* ok */
1325 .ioctl = inet6_ioctl, /* must change */
1326 .listen = sock_no_listen, /* ok */
1327 .shutdown = inet_shutdown, /* ok */
1328 .setsockopt = sock_common_setsockopt, /* ok */
1329 .getsockopt = sock_common_getsockopt, /* ok */
1330 .sendmsg = inet_sendmsg, /* ok */
1331 .recvmsg = sock_common_recvmsg, /* ok */
1332 .mmap = sock_no_mmap,
1333 .sendpage = sock_no_sendpage,
1334#ifdef CONFIG_COMPAT
1335 .compat_setsockopt = compat_sock_common_setsockopt,
1336 .compat_getsockopt = compat_sock_common_getsockopt,
1337#endif
1338};
1339
1340static struct inet_protosw rawv6_protosw = {
1341 .type = SOCK_RAW,
1342 .protocol = IPPROTO_IP, /* wild card */
1343 .prot = &rawv6_prot,
1344 .ops = &inet6_sockraw_ops,
1345 .no_check = UDP_CSUM_DEFAULT,
1346 .flags = INET_PROTOSW_REUSE,
1347};
1348
1349int __init rawv6_init(void)
1350{
1351 int ret;
1352
1353 ret = inet6_register_protosw(&rawv6_protosw);
1354 if (ret)
1355 goto out;
1356out:
1357 return ret;
1358}
1359
1360void rawv6_exit(void)
1361{
1362 inet6_unregister_protosw(&rawv6_protosw);
1363}
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 = {
65 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
66};
67EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
68
69struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
70 unsigned short num, const struct in6_addr *loc_addr,
71 const struct in6_addr *rmt_addr, int dif, int sdif)
72{
73 bool is_multicast = ipv6_addr_is_multicast(loc_addr);
74
75 sk_for_each_from(sk)
76 if (inet_sk(sk)->inet_num == num) {
77
78 if (!net_eq(sock_net(sk), net))
79 continue;
80
81 if (!ipv6_addr_any(&sk->sk_v6_daddr) &&
82 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr))
83 continue;
84
85 if (!raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
86 dif, sdif))
87 continue;
88
89 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
90 if (ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))
91 goto found;
92 if (is_multicast &&
93 inet6_mc_check(sk, loc_addr, rmt_addr))
94 goto found;
95 continue;
96 }
97 goto found;
98 }
99 sk = NULL;
100found:
101 return sk;
102}
103EXPORT_SYMBOL_GPL(__raw_v6_lookup);
104
105/*
106 * 0 - deliver
107 * 1 - block
108 */
109static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
110{
111 struct icmp6hdr _hdr;
112 const struct icmp6hdr *hdr;
113
114 /* We require only the four bytes of the ICMPv6 header, not any
115 * additional bytes of message body in "struct icmp6hdr".
116 */
117 hdr = skb_header_pointer(skb, skb_transport_offset(skb),
118 ICMPV6_HDRLEN, &_hdr);
119 if (hdr) {
120 const __u32 *data = &raw6_sk(sk)->filter.data[0];
121 unsigned int type = hdr->icmp6_type;
122
123 return (data[type >> 5] & (1U << (type & 31))) != 0;
124 }
125 return 1;
126}
127
128#if IS_ENABLED(CONFIG_IPV6_MIP6)
129typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
130
131static mh_filter_t __rcu *mh_filter __read_mostly;
132
133int rawv6_mh_filter_register(mh_filter_t filter)
134{
135 rcu_assign_pointer(mh_filter, filter);
136 return 0;
137}
138EXPORT_SYMBOL(rawv6_mh_filter_register);
139
140int rawv6_mh_filter_unregister(mh_filter_t filter)
141{
142 RCU_INIT_POINTER(mh_filter, NULL);
143 synchronize_rcu();
144 return 0;
145}
146EXPORT_SYMBOL(rawv6_mh_filter_unregister);
147
148#endif
149
150/*
151 * demultiplex raw sockets.
152 * (should consider queueing the skb in the sock receive_queue
153 * without calling rawv6.c)
154 *
155 * Caller owns SKB so we must make clones.
156 */
157static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
158{
159 const struct in6_addr *saddr;
160 const struct in6_addr *daddr;
161 struct sock *sk;
162 bool delivered = false;
163 __u8 hash;
164 struct net *net;
165
166 saddr = &ipv6_hdr(skb)->saddr;
167 daddr = saddr + 1;
168
169 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
170
171 read_lock(&raw_v6_hashinfo.lock);
172 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
173
174 if (!sk)
175 goto out;
176
177 net = dev_net(skb->dev);
178 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr,
179 inet6_iif(skb), inet6_sdif(skb));
180
181 while (sk) {
182 int filtered;
183
184 delivered = true;
185 switch (nexthdr) {
186 case IPPROTO_ICMPV6:
187 filtered = icmpv6_filter(sk, skb);
188 break;
189
190#if IS_ENABLED(CONFIG_IPV6_MIP6)
191 case IPPROTO_MH:
192 {
193 /* XXX: To validate MH only once for each packet,
194 * this is placed here. It should be after checking
195 * xfrm policy, however it doesn't. The checking xfrm
196 * policy is placed in rawv6_rcv() because it is
197 * required for each socket.
198 */
199 mh_filter_t *filter;
200
201 filter = rcu_dereference(mh_filter);
202 filtered = filter ? (*filter)(sk, skb) : 0;
203 break;
204 }
205#endif
206 default:
207 filtered = 0;
208 break;
209 }
210
211 if (filtered < 0)
212 break;
213 if (filtered == 0) {
214 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
215
216 /* Not releasing hash table! */
217 if (clone) {
218 nf_reset_ct(clone);
219 rawv6_rcv(sk, clone);
220 }
221 }
222 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
223 inet6_iif(skb), inet6_sdif(skb));
224 }
225out:
226 read_unlock(&raw_v6_hashinfo.lock);
227 return delivered;
228}
229
230bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
231{
232 struct sock *raw_sk;
233
234 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]);
235 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
236 raw_sk = NULL;
237
238 return raw_sk != NULL;
239}
240
241/* This cleans up af_inet6 a bit. -DaveM */
242static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
243{
244 struct inet_sock *inet = inet_sk(sk);
245 struct ipv6_pinfo *np = inet6_sk(sk);
246 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
247 __be32 v4addr = 0;
248 int addr_type;
249 int err;
250
251 if (addr_len < SIN6_LEN_RFC2133)
252 return -EINVAL;
253
254 if (addr->sin6_family != AF_INET6)
255 return -EINVAL;
256
257 addr_type = ipv6_addr_type(&addr->sin6_addr);
258
259 /* Raw sockets are IPv6 only */
260 if (addr_type == IPV6_ADDR_MAPPED)
261 return -EADDRNOTAVAIL;
262
263 lock_sock(sk);
264
265 err = -EINVAL;
266 if (sk->sk_state != TCP_CLOSE)
267 goto out;
268
269 rcu_read_lock();
270 /* Check if the address belongs to the host. */
271 if (addr_type != IPV6_ADDR_ANY) {
272 struct net_device *dev = NULL;
273
274 if (__ipv6_addr_needs_scope_id(addr_type)) {
275 if (addr_len >= sizeof(struct sockaddr_in6) &&
276 addr->sin6_scope_id) {
277 /* Override any existing binding, if another
278 * one is supplied by user.
279 */
280 sk->sk_bound_dev_if = addr->sin6_scope_id;
281 }
282
283 /* Binding to link-local address requires an interface */
284 if (!sk->sk_bound_dev_if)
285 goto out_unlock;
286 }
287
288 if (sk->sk_bound_dev_if) {
289 err = -ENODEV;
290 dev = dev_get_by_index_rcu(sock_net(sk),
291 sk->sk_bound_dev_if);
292 if (!dev)
293 goto out_unlock;
294 }
295
296 /* ipv4 addr of the socket is invalid. Only the
297 * unspecified and mapped address have a v4 equivalent.
298 */
299 v4addr = LOOPBACK4_IPV6;
300 if (!(addr_type & IPV6_ADDR_MULTICAST) &&
301 !ipv6_can_nonlocal_bind(sock_net(sk), inet)) {
302 err = -EADDRNOTAVAIL;
303 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
304 dev, 0)) {
305 goto out_unlock;
306 }
307 }
308 }
309
310 inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
311 sk->sk_v6_rcv_saddr = addr->sin6_addr;
312 if (!(addr_type & IPV6_ADDR_MULTICAST))
313 np->saddr = addr->sin6_addr;
314 err = 0;
315out_unlock:
316 rcu_read_unlock();
317out:
318 release_sock(sk);
319 return err;
320}
321
322static void rawv6_err(struct sock *sk, struct sk_buff *skb,
323 struct inet6_skb_parm *opt,
324 u8 type, u8 code, int offset, __be32 info)
325{
326 struct inet_sock *inet = inet_sk(sk);
327 struct ipv6_pinfo *np = inet6_sk(sk);
328 int err;
329 int harderr;
330
331 /* Report error on raw socket, if:
332 1. User requested recverr.
333 2. Socket is connected (otherwise the error indication
334 is useless without recverr and error is hard.
335 */
336 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
337 return;
338
339 harderr = icmpv6_err_convert(type, code, &err);
340 if (type == ICMPV6_PKT_TOOBIG) {
341 ip6_sk_update_pmtu(skb, sk, info);
342 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
343 }
344 if (type == NDISC_REDIRECT) {
345 ip6_sk_redirect(skb, sk);
346 return;
347 }
348 if (np->recverr) {
349 u8 *payload = skb->data;
350 if (!inet->hdrincl)
351 payload += offset;
352 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
353 }
354
355 if (np->recverr || harderr) {
356 sk->sk_err = err;
357 sk_error_report(sk);
358 }
359}
360
361void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
362 u8 type, u8 code, int inner_offset, __be32 info)
363{
364 struct sock *sk;
365 int hash;
366 const struct in6_addr *saddr, *daddr;
367 struct net *net;
368
369 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
370
371 read_lock(&raw_v6_hashinfo.lock);
372 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
373 if (sk) {
374 /* Note: ipv6_hdr(skb) != skb->data */
375 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
376 saddr = &ip6h->saddr;
377 daddr = &ip6h->daddr;
378 net = dev_net(skb->dev);
379
380 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
381 inet6_iif(skb), inet6_iif(skb)))) {
382 rawv6_err(sk, skb, NULL, type, code,
383 inner_offset, info);
384 sk = sk_next(sk);
385 }
386 }
387 read_unlock(&raw_v6_hashinfo.lock);
388}
389
390static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
391{
392 if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
393 skb_checksum_complete(skb)) {
394 atomic_inc(&sk->sk_drops);
395 kfree_skb(skb);
396 return NET_RX_DROP;
397 }
398
399 /* Charge it to the socket. */
400 skb_dst_drop(skb);
401 if (sock_queue_rcv_skb(sk, skb) < 0) {
402 kfree_skb(skb);
403 return NET_RX_DROP;
404 }
405
406 return 0;
407}
408
409/*
410 * This is next to useless...
411 * if we demultiplex in network layer we don't need the extra call
412 * just to queue the skb...
413 * maybe we could have the network decide upon a hint if it
414 * should call raw_rcv for demultiplexing
415 */
416int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
417{
418 struct inet_sock *inet = inet_sk(sk);
419 struct raw6_sock *rp = raw6_sk(sk);
420
421 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
422 atomic_inc(&sk->sk_drops);
423 kfree_skb(skb);
424 return NET_RX_DROP;
425 }
426
427 if (!rp->checksum)
428 skb->ip_summed = CHECKSUM_UNNECESSARY;
429
430 if (skb->ip_summed == CHECKSUM_COMPLETE) {
431 skb_postpull_rcsum(skb, skb_network_header(skb),
432 skb_network_header_len(skb));
433 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
434 &ipv6_hdr(skb)->daddr,
435 skb->len, inet->inet_num, skb->csum))
436 skb->ip_summed = CHECKSUM_UNNECESSARY;
437 }
438 if (!skb_csum_unnecessary(skb))
439 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
440 &ipv6_hdr(skb)->daddr,
441 skb->len,
442 inet->inet_num, 0));
443
444 if (inet->hdrincl) {
445 if (skb_checksum_complete(skb)) {
446 atomic_inc(&sk->sk_drops);
447 kfree_skb(skb);
448 return NET_RX_DROP;
449 }
450 }
451
452 rawv6_rcv_skb(sk, skb);
453 return 0;
454}
455
456
457/*
458 * This should be easy, if there is something there
459 * we return it, otherwise we block.
460 */
461
462static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
463 int noblock, int flags, int *addr_len)
464{
465 struct ipv6_pinfo *np = inet6_sk(sk);
466 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
467 struct sk_buff *skb;
468 size_t copied;
469 int err;
470
471 if (flags & MSG_OOB)
472 return -EOPNOTSUPP;
473
474 if (flags & MSG_ERRQUEUE)
475 return ipv6_recv_error(sk, msg, len, addr_len);
476
477 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
478 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
479
480 skb = skb_recv_datagram(sk, flags, noblock, &err);
481 if (!skb)
482 goto out;
483
484 copied = skb->len;
485 if (copied > len) {
486 copied = len;
487 msg->msg_flags |= MSG_TRUNC;
488 }
489
490 if (skb_csum_unnecessary(skb)) {
491 err = skb_copy_datagram_msg(skb, 0, msg, copied);
492 } else if (msg->msg_flags&MSG_TRUNC) {
493 if (__skb_checksum_complete(skb))
494 goto csum_copy_err;
495 err = skb_copy_datagram_msg(skb, 0, msg, copied);
496 } else {
497 err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
498 if (err == -EINVAL)
499 goto csum_copy_err;
500 }
501 if (err)
502 goto out_free;
503
504 /* Copy the address. */
505 if (sin6) {
506 sin6->sin6_family = AF_INET6;
507 sin6->sin6_port = 0;
508 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
509 sin6->sin6_flowinfo = 0;
510 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
511 inet6_iif(skb));
512 *addr_len = sizeof(*sin6);
513 }
514
515 sock_recv_ts_and_drops(msg, sk, skb);
516
517 if (np->rxopt.all)
518 ip6_datagram_recv_ctl(sk, msg, skb);
519
520 err = copied;
521 if (flags & MSG_TRUNC)
522 err = skb->len;
523
524out_free:
525 skb_free_datagram(sk, skb);
526out:
527 return err;
528
529csum_copy_err:
530 skb_kill_datagram(sk, skb, flags);
531
532 /* Error for blocking case is chosen to masquerade
533 as some normal condition.
534 */
535 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
536 goto out;
537}
538
539static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
540 struct raw6_sock *rp)
541{
542 struct sk_buff *skb;
543 int err = 0;
544 int offset;
545 int len;
546 int total_len;
547 __wsum tmp_csum;
548 __sum16 csum;
549
550 if (!rp->checksum)
551 goto send;
552
553 skb = skb_peek(&sk->sk_write_queue);
554 if (!skb)
555 goto out;
556
557 offset = rp->offset;
558 total_len = inet_sk(sk)->cork.base.length;
559 if (offset >= total_len - 1) {
560 err = -EINVAL;
561 ip6_flush_pending_frames(sk);
562 goto out;
563 }
564
565 /* should be check HW csum miyazawa */
566 if (skb_queue_len(&sk->sk_write_queue) == 1) {
567 /*
568 * Only one fragment on the socket.
569 */
570 tmp_csum = skb->csum;
571 } else {
572 struct sk_buff *csum_skb = NULL;
573 tmp_csum = 0;
574
575 skb_queue_walk(&sk->sk_write_queue, skb) {
576 tmp_csum = csum_add(tmp_csum, skb->csum);
577
578 if (csum_skb)
579 continue;
580
581 len = skb->len - skb_transport_offset(skb);
582 if (offset >= len) {
583 offset -= len;
584 continue;
585 }
586
587 csum_skb = skb;
588 }
589
590 skb = csum_skb;
591 }
592
593 offset += skb_transport_offset(skb);
594 err = skb_copy_bits(skb, offset, &csum, 2);
595 if (err < 0) {
596 ip6_flush_pending_frames(sk);
597 goto out;
598 }
599
600 /* in case cksum was not initialized */
601 if (unlikely(csum))
602 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
603
604 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
605 total_len, fl6->flowi6_proto, tmp_csum);
606
607 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
608 csum = CSUM_MANGLED_0;
609
610 BUG_ON(skb_store_bits(skb, offset, &csum, 2));
611
612send:
613 err = ip6_push_pending_frames(sk);
614out:
615 return err;
616}
617
618static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
619 struct flowi6 *fl6, struct dst_entry **dstp,
620 unsigned int flags, const struct sockcm_cookie *sockc)
621{
622 struct ipv6_pinfo *np = inet6_sk(sk);
623 struct net *net = sock_net(sk);
624 struct ipv6hdr *iph;
625 struct sk_buff *skb;
626 int err;
627 struct rt6_info *rt = (struct rt6_info *)*dstp;
628 int hlen = LL_RESERVED_SPACE(rt->dst.dev);
629 int tlen = rt->dst.dev->needed_tailroom;
630
631 if (length > rt->dst.dev->mtu) {
632 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
633 return -EMSGSIZE;
634 }
635 if (length < sizeof(struct ipv6hdr))
636 return -EINVAL;
637 if (flags&MSG_PROBE)
638 goto out;
639
640 skb = sock_alloc_send_skb(sk,
641 length + hlen + tlen + 15,
642 flags & MSG_DONTWAIT, &err);
643 if (!skb)
644 goto error;
645 skb_reserve(skb, hlen);
646
647 skb->protocol = htons(ETH_P_IPV6);
648 skb->priority = sk->sk_priority;
649 skb->mark = sockc->mark;
650 skb->tstamp = sockc->transmit_time;
651
652 skb_put(skb, length);
653 skb_reset_network_header(skb);
654 iph = ipv6_hdr(skb);
655
656 skb->ip_summed = CHECKSUM_NONE;
657
658 skb_setup_tx_timestamp(skb, sockc->tsflags);
659
660 if (flags & MSG_CONFIRM)
661 skb_set_dst_pending_confirm(skb, 1);
662
663 skb->transport_header = skb->network_header;
664 err = memcpy_from_msg(iph, msg, length);
665 if (err) {
666 err = -EFAULT;
667 kfree_skb(skb);
668 goto error;
669 }
670
671 skb_dst_set(skb, &rt->dst);
672 *dstp = NULL;
673
674 /* if egress device is enslaved to an L3 master device pass the
675 * skb to its handler for processing
676 */
677 skb = l3mdev_ip6_out(sk, skb);
678 if (unlikely(!skb))
679 return 0;
680
681 /* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev
682 * in the error path. Since skb has been freed, the dst could
683 * have been queued for deletion.
684 */
685 rcu_read_lock();
686 IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
687 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
688 NULL, rt->dst.dev, dst_output);
689 if (err > 0)
690 err = net_xmit_errno(err);
691 if (err) {
692 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
693 rcu_read_unlock();
694 goto error_check;
695 }
696 rcu_read_unlock();
697out:
698 return 0;
699
700error:
701 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
702error_check:
703 if (err == -ENOBUFS && !np->recverr)
704 err = 0;
705 return err;
706}
707
708struct raw6_frag_vec {
709 struct msghdr *msg;
710 int hlen;
711 char c[4];
712};
713
714static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
715{
716 int err = 0;
717 switch (fl6->flowi6_proto) {
718 case IPPROTO_ICMPV6:
719 rfv->hlen = 2;
720 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
721 if (!err) {
722 fl6->fl6_icmp_type = rfv->c[0];
723 fl6->fl6_icmp_code = rfv->c[1];
724 }
725 break;
726 case IPPROTO_MH:
727 rfv->hlen = 4;
728 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
729 if (!err)
730 fl6->fl6_mh_type = rfv->c[2];
731 }
732 return err;
733}
734
735static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
736 struct sk_buff *skb)
737{
738 struct raw6_frag_vec *rfv = from;
739
740 if (offset < rfv->hlen) {
741 int copy = min(rfv->hlen - offset, len);
742
743 if (skb->ip_summed == CHECKSUM_PARTIAL)
744 memcpy(to, rfv->c + offset, copy);
745 else
746 skb->csum = csum_block_add(
747 skb->csum,
748 csum_partial_copy_nocheck(rfv->c + offset,
749 to, copy),
750 odd);
751
752 odd = 0;
753 offset += copy;
754 to += copy;
755 len -= copy;
756
757 if (!len)
758 return 0;
759 }
760
761 offset -= rfv->hlen;
762
763 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
764}
765
766static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
767{
768 struct ipv6_txoptions *opt_to_free = NULL;
769 struct ipv6_txoptions opt_space;
770 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
771 struct in6_addr *daddr, *final_p, final;
772 struct inet_sock *inet = inet_sk(sk);
773 struct ipv6_pinfo *np = inet6_sk(sk);
774 struct raw6_sock *rp = raw6_sk(sk);
775 struct ipv6_txoptions *opt = NULL;
776 struct ip6_flowlabel *flowlabel = NULL;
777 struct dst_entry *dst = NULL;
778 struct raw6_frag_vec rfv;
779 struct flowi6 fl6;
780 struct ipcm6_cookie ipc6;
781 int addr_len = msg->msg_namelen;
782 int hdrincl;
783 u16 proto;
784 int err;
785
786 /* Rough check on arithmetic overflow,
787 better check is made in ip6_append_data().
788 */
789 if (len > INT_MAX)
790 return -EMSGSIZE;
791
792 /* Mirror BSD error message compatibility */
793 if (msg->msg_flags & MSG_OOB)
794 return -EOPNOTSUPP;
795
796 /* hdrincl should be READ_ONCE(inet->hdrincl)
797 * but READ_ONCE() doesn't work with bit fields.
798 * Doing this indirectly yields the same result.
799 */
800 hdrincl = inet->hdrincl;
801 hdrincl = READ_ONCE(hdrincl);
802
803 /*
804 * Get and verify the address.
805 */
806 memset(&fl6, 0, sizeof(fl6));
807
808 fl6.flowi6_mark = sk->sk_mark;
809 fl6.flowi6_uid = sk->sk_uid;
810
811 ipcm6_init(&ipc6);
812 ipc6.sockc.tsflags = sk->sk_tsflags;
813 ipc6.sockc.mark = sk->sk_mark;
814
815 if (sin6) {
816 if (addr_len < SIN6_LEN_RFC2133)
817 return -EINVAL;
818
819 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
820 return -EAFNOSUPPORT;
821
822 /* port is the proto value [0..255] carried in nexthdr */
823 proto = ntohs(sin6->sin6_port);
824
825 if (!proto)
826 proto = inet->inet_num;
827 else if (proto != inet->inet_num)
828 return -EINVAL;
829
830 if (proto > 255)
831 return -EINVAL;
832
833 daddr = &sin6->sin6_addr;
834 if (np->sndflow) {
835 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
836 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
837 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
838 if (IS_ERR(flowlabel))
839 return -EINVAL;
840 }
841 }
842
843 /*
844 * Otherwise it will be difficult to maintain
845 * sk->sk_dst_cache.
846 */
847 if (sk->sk_state == TCP_ESTABLISHED &&
848 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
849 daddr = &sk->sk_v6_daddr;
850
851 if (addr_len >= sizeof(struct sockaddr_in6) &&
852 sin6->sin6_scope_id &&
853 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
854 fl6.flowi6_oif = sin6->sin6_scope_id;
855 } else {
856 if (sk->sk_state != TCP_ESTABLISHED)
857 return -EDESTADDRREQ;
858
859 proto = inet->inet_num;
860 daddr = &sk->sk_v6_daddr;
861 fl6.flowlabel = np->flow_label;
862 }
863
864 if (fl6.flowi6_oif == 0)
865 fl6.flowi6_oif = sk->sk_bound_dev_if;
866
867 if (msg->msg_controllen) {
868 opt = &opt_space;
869 memset(opt, 0, sizeof(struct ipv6_txoptions));
870 opt->tot_len = sizeof(struct ipv6_txoptions);
871 ipc6.opt = opt;
872
873 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
874 if (err < 0) {
875 fl6_sock_release(flowlabel);
876 return err;
877 }
878 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
879 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
880 if (IS_ERR(flowlabel))
881 return -EINVAL;
882 }
883 if (!(opt->opt_nflen|opt->opt_flen))
884 opt = NULL;
885 }
886 if (!opt) {
887 opt = txopt_get(np);
888 opt_to_free = opt;
889 }
890 if (flowlabel)
891 opt = fl6_merge_options(&opt_space, flowlabel, opt);
892 opt = ipv6_fixup_options(&opt_space, opt);
893
894 fl6.flowi6_proto = proto;
895 fl6.flowi6_mark = ipc6.sockc.mark;
896
897 if (!hdrincl) {
898 rfv.msg = msg;
899 rfv.hlen = 0;
900 err = rawv6_probe_proto_opt(&rfv, &fl6);
901 if (err)
902 goto out;
903 }
904
905 if (!ipv6_addr_any(daddr))
906 fl6.daddr = *daddr;
907 else
908 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
909 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
910 fl6.saddr = np->saddr;
911
912 final_p = fl6_update_dst(&fl6, opt, &final);
913
914 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
915 fl6.flowi6_oif = np->mcast_oif;
916 else if (!fl6.flowi6_oif)
917 fl6.flowi6_oif = np->ucast_oif;
918 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
919
920 if (hdrincl)
921 fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH;
922
923 if (ipc6.tclass < 0)
924 ipc6.tclass = np->tclass;
925
926 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
927
928 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
929 if (IS_ERR(dst)) {
930 err = PTR_ERR(dst);
931 goto out;
932 }
933 if (ipc6.hlimit < 0)
934 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
935
936 if (ipc6.dontfrag < 0)
937 ipc6.dontfrag = np->dontfrag;
938
939 if (msg->msg_flags&MSG_CONFIRM)
940 goto do_confirm;
941
942back_from_confirm:
943 if (hdrincl)
944 err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst,
945 msg->msg_flags, &ipc6.sockc);
946 else {
947 ipc6.opt = opt;
948 lock_sock(sk);
949 err = ip6_append_data(sk, raw6_getfrag, &rfv,
950 len, 0, &ipc6, &fl6, (struct rt6_info *)dst,
951 msg->msg_flags);
952
953 if (err)
954 ip6_flush_pending_frames(sk);
955 else if (!(msg->msg_flags & MSG_MORE))
956 err = rawv6_push_pending_frames(sk, &fl6, rp);
957 release_sock(sk);
958 }
959done:
960 dst_release(dst);
961out:
962 fl6_sock_release(flowlabel);
963 txopt_put(opt_to_free);
964 return err < 0 ? err : len;
965do_confirm:
966 if (msg->msg_flags & MSG_PROBE)
967 dst_confirm_neigh(dst, &fl6.daddr);
968 if (!(msg->msg_flags & MSG_PROBE) || len)
969 goto back_from_confirm;
970 err = 0;
971 goto done;
972}
973
974static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
975 sockptr_t optval, int optlen)
976{
977 switch (optname) {
978 case ICMPV6_FILTER:
979 if (optlen > sizeof(struct icmp6_filter))
980 optlen = sizeof(struct icmp6_filter);
981 if (copy_from_sockptr(&raw6_sk(sk)->filter, optval, optlen))
982 return -EFAULT;
983 return 0;
984 default:
985 return -ENOPROTOOPT;
986 }
987
988 return 0;
989}
990
991static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
992 char __user *optval, int __user *optlen)
993{
994 int len;
995
996 switch (optname) {
997 case ICMPV6_FILTER:
998 if (get_user(len, optlen))
999 return -EFAULT;
1000 if (len < 0)
1001 return -EINVAL;
1002 if (len > sizeof(struct icmp6_filter))
1003 len = sizeof(struct icmp6_filter);
1004 if (put_user(len, optlen))
1005 return -EFAULT;
1006 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
1007 return -EFAULT;
1008 return 0;
1009 default:
1010 return -ENOPROTOOPT;
1011 }
1012
1013 return 0;
1014}
1015
1016
1017static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
1018 sockptr_t optval, unsigned int optlen)
1019{
1020 struct raw6_sock *rp = raw6_sk(sk);
1021 int val;
1022
1023 if (copy_from_sockptr(&val, optval, sizeof(val)))
1024 return -EFAULT;
1025
1026 switch (optname) {
1027 case IPV6_HDRINCL:
1028 if (sk->sk_type != SOCK_RAW)
1029 return -EINVAL;
1030 inet_sk(sk)->hdrincl = !!val;
1031 return 0;
1032 case IPV6_CHECKSUM:
1033 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
1034 level == IPPROTO_IPV6) {
1035 /*
1036 * RFC3542 tells that IPV6_CHECKSUM socket
1037 * option in the IPPROTO_IPV6 level is not
1038 * allowed on ICMPv6 sockets.
1039 * If you want to set it, use IPPROTO_RAW
1040 * level IPV6_CHECKSUM socket option
1041 * (Linux extension).
1042 */
1043 return -EINVAL;
1044 }
1045
1046 /* You may get strange result with a positive odd offset;
1047 RFC2292bis agrees with me. */
1048 if (val > 0 && (val&1))
1049 return -EINVAL;
1050 if (val < 0) {
1051 rp->checksum = 0;
1052 } else {
1053 rp->checksum = 1;
1054 rp->offset = val;
1055 }
1056
1057 return 0;
1058
1059 default:
1060 return -ENOPROTOOPT;
1061 }
1062}
1063
1064static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1065 sockptr_t optval, unsigned int optlen)
1066{
1067 switch (level) {
1068 case SOL_RAW:
1069 break;
1070
1071 case SOL_ICMPV6:
1072 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1073 return -EOPNOTSUPP;
1074 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1075 case SOL_IPV6:
1076 if (optname == IPV6_CHECKSUM ||
1077 optname == IPV6_HDRINCL)
1078 break;
1079 fallthrough;
1080 default:
1081 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1082 }
1083
1084 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1085}
1086
1087static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1088 char __user *optval, int __user *optlen)
1089{
1090 struct raw6_sock *rp = raw6_sk(sk);
1091 int val, len;
1092
1093 if (get_user(len, optlen))
1094 return -EFAULT;
1095
1096 switch (optname) {
1097 case IPV6_HDRINCL:
1098 val = inet_sk(sk)->hdrincl;
1099 break;
1100 case IPV6_CHECKSUM:
1101 /*
1102 * We allow getsockopt() for IPPROTO_IPV6-level
1103 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1104 * since RFC3542 is silent about it.
1105 */
1106 if (rp->checksum == 0)
1107 val = -1;
1108 else
1109 val = rp->offset;
1110 break;
1111
1112 default:
1113 return -ENOPROTOOPT;
1114 }
1115
1116 len = min_t(unsigned int, sizeof(int), len);
1117
1118 if (put_user(len, optlen))
1119 return -EFAULT;
1120 if (copy_to_user(optval, &val, len))
1121 return -EFAULT;
1122 return 0;
1123}
1124
1125static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1126 char __user *optval, int __user *optlen)
1127{
1128 switch (level) {
1129 case SOL_RAW:
1130 break;
1131
1132 case SOL_ICMPV6:
1133 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1134 return -EOPNOTSUPP;
1135 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1136 case SOL_IPV6:
1137 if (optname == IPV6_CHECKSUM ||
1138 optname == IPV6_HDRINCL)
1139 break;
1140 fallthrough;
1141 default:
1142 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1143 }
1144
1145 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1146}
1147
1148static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1149{
1150 switch (cmd) {
1151 case SIOCOUTQ: {
1152 int amount = sk_wmem_alloc_get(sk);
1153
1154 return put_user(amount, (int __user *)arg);
1155 }
1156 case SIOCINQ: {
1157 struct sk_buff *skb;
1158 int amount = 0;
1159
1160 spin_lock_bh(&sk->sk_receive_queue.lock);
1161 skb = skb_peek(&sk->sk_receive_queue);
1162 if (skb)
1163 amount = skb->len;
1164 spin_unlock_bh(&sk->sk_receive_queue.lock);
1165 return put_user(amount, (int __user *)arg);
1166 }
1167
1168 default:
1169#ifdef CONFIG_IPV6_MROUTE
1170 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1171#else
1172 return -ENOIOCTLCMD;
1173#endif
1174 }
1175}
1176
1177#ifdef CONFIG_COMPAT
1178static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1179{
1180 switch (cmd) {
1181 case SIOCOUTQ:
1182 case SIOCINQ:
1183 return -ENOIOCTLCMD;
1184 default:
1185#ifdef CONFIG_IPV6_MROUTE
1186 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1187#else
1188 return -ENOIOCTLCMD;
1189#endif
1190 }
1191}
1192#endif
1193
1194static void rawv6_close(struct sock *sk, long timeout)
1195{
1196 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1197 ip6_ra_control(sk, -1);
1198 ip6mr_sk_done(sk);
1199 sk_common_release(sk);
1200}
1201
1202static void raw6_destroy(struct sock *sk)
1203{
1204 lock_sock(sk);
1205 ip6_flush_pending_frames(sk);
1206 release_sock(sk);
1207
1208 inet6_destroy_sock(sk);
1209}
1210
1211static int rawv6_init_sk(struct sock *sk)
1212{
1213 struct raw6_sock *rp = raw6_sk(sk);
1214
1215 switch (inet_sk(sk)->inet_num) {
1216 case IPPROTO_ICMPV6:
1217 rp->checksum = 1;
1218 rp->offset = 2;
1219 break;
1220 case IPPROTO_MH:
1221 rp->checksum = 1;
1222 rp->offset = 4;
1223 break;
1224 default:
1225 break;
1226 }
1227 return 0;
1228}
1229
1230struct proto rawv6_prot = {
1231 .name = "RAWv6",
1232 .owner = THIS_MODULE,
1233 .close = rawv6_close,
1234 .destroy = raw6_destroy,
1235 .connect = ip6_datagram_connect_v6_only,
1236 .disconnect = __udp_disconnect,
1237 .ioctl = rawv6_ioctl,
1238 .init = rawv6_init_sk,
1239 .setsockopt = rawv6_setsockopt,
1240 .getsockopt = rawv6_getsockopt,
1241 .sendmsg = rawv6_sendmsg,
1242 .recvmsg = rawv6_recvmsg,
1243 .bind = rawv6_bind,
1244 .backlog_rcv = rawv6_rcv_skb,
1245 .hash = raw_hash_sk,
1246 .unhash = raw_unhash_sk,
1247 .obj_size = sizeof(struct raw6_sock),
1248 .useroffset = offsetof(struct raw6_sock, filter),
1249 .usersize = sizeof_field(struct raw6_sock, filter),
1250 .h.raw_hash = &raw_v6_hashinfo,
1251#ifdef CONFIG_COMPAT
1252 .compat_ioctl = compat_rawv6_ioctl,
1253#endif
1254 .diag_destroy = raw_abort,
1255};
1256
1257#ifdef CONFIG_PROC_FS
1258static int raw6_seq_show(struct seq_file *seq, void *v)
1259{
1260 if (v == SEQ_START_TOKEN) {
1261 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1262 } else {
1263 struct sock *sp = v;
1264 __u16 srcp = inet_sk(sp)->inet_num;
1265 ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1266 raw_seq_private(seq)->bucket);
1267 }
1268 return 0;
1269}
1270
1271static const struct seq_operations raw6_seq_ops = {
1272 .start = raw_seq_start,
1273 .next = raw_seq_next,
1274 .stop = raw_seq_stop,
1275 .show = raw6_seq_show,
1276};
1277
1278static int __net_init raw6_init_net(struct net *net)
1279{
1280 if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops,
1281 sizeof(struct raw_iter_state), &raw_v6_hashinfo))
1282 return -ENOMEM;
1283
1284 return 0;
1285}
1286
1287static void __net_exit raw6_exit_net(struct net *net)
1288{
1289 remove_proc_entry("raw6", net->proc_net);
1290}
1291
1292static struct pernet_operations raw6_net_ops = {
1293 .init = raw6_init_net,
1294 .exit = raw6_exit_net,
1295};
1296
1297int __init raw6_proc_init(void)
1298{
1299 return register_pernet_subsys(&raw6_net_ops);
1300}
1301
1302void raw6_proc_exit(void)
1303{
1304 unregister_pernet_subsys(&raw6_net_ops);
1305}
1306#endif /* CONFIG_PROC_FS */
1307
1308/* Same as inet6_dgram_ops, sans udp_poll. */
1309const struct proto_ops inet6_sockraw_ops = {
1310 .family = PF_INET6,
1311 .owner = THIS_MODULE,
1312 .release = inet6_release,
1313 .bind = inet6_bind,
1314 .connect = inet_dgram_connect, /* ok */
1315 .socketpair = sock_no_socketpair, /* a do nothing */
1316 .accept = sock_no_accept, /* a do nothing */
1317 .getname = inet6_getname,
1318 .poll = datagram_poll, /* ok */
1319 .ioctl = inet6_ioctl, /* must change */
1320 .gettstamp = sock_gettstamp,
1321 .listen = sock_no_listen, /* ok */
1322 .shutdown = inet_shutdown, /* ok */
1323 .setsockopt = sock_common_setsockopt, /* ok */
1324 .getsockopt = sock_common_getsockopt, /* ok */
1325 .sendmsg = inet_sendmsg, /* ok */
1326 .recvmsg = sock_common_recvmsg, /* ok */
1327 .mmap = sock_no_mmap,
1328 .sendpage = sock_no_sendpage,
1329#ifdef CONFIG_COMPAT
1330 .compat_ioctl = inet6_compat_ioctl,
1331#endif
1332};
1333
1334static struct inet_protosw rawv6_protosw = {
1335 .type = SOCK_RAW,
1336 .protocol = IPPROTO_IP, /* wild card */
1337 .prot = &rawv6_prot,
1338 .ops = &inet6_sockraw_ops,
1339 .flags = INET_PROTOSW_REUSE,
1340};
1341
1342int __init rawv6_init(void)
1343{
1344 return inet6_register_protosw(&rawv6_protosw);
1345}
1346
1347void rawv6_exit(void)
1348{
1349 inet6_unregister_protosw(&rawv6_protosw);
1350}