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1/*
2 * RAW sockets for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Adapted from linux/net/ipv4/raw.c
9 *
10 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance)
13 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 */
20
21#include <linux/errno.h>
22#include <linux/types.h>
23#include <linux/socket.h>
24#include <linux/slab.h>
25#include <linux/sockios.h>
26#include <linux/net.h>
27#include <linux/in6.h>
28#include <linux/netdevice.h>
29#include <linux/if_arp.h>
30#include <linux/icmpv6.h>
31#include <linux/netfilter.h>
32#include <linux/netfilter_ipv6.h>
33#include <linux/skbuff.h>
34#include <linux/compat.h>
35#include <linux/uaccess.h>
36#include <asm/ioctls.h>
37
38#include <net/net_namespace.h>
39#include <net/ip.h>
40#include <net/sock.h>
41#include <net/snmp.h>
42
43#include <net/ipv6.h>
44#include <net/ndisc.h>
45#include <net/protocol.h>
46#include <net/ip6_route.h>
47#include <net/ip6_checksum.h>
48#include <net/addrconf.h>
49#include <net/transp_v6.h>
50#include <net/udp.h>
51#include <net/inet_common.h>
52#include <net/tcp_states.h>
53#if IS_ENABLED(CONFIG_IPV6_MIP6)
54#include <net/mip6.h>
55#endif
56#include <linux/mroute6.h>
57
58#include <net/raw.h>
59#include <net/rawv6.h>
60#include <net/xfrm.h>
61
62#include <linux/proc_fs.h>
63#include <linux/seq_file.h>
64#include <linux/export.h>
65
66#define ICMPV6_HDRLEN 4 /* ICMPv6 header, RFC 4443 Section 2.1 */
67
68struct raw_hashinfo raw_v6_hashinfo = {
69 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
70};
71EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
72
73struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
74 unsigned short num, const struct in6_addr *loc_addr,
75 const struct in6_addr *rmt_addr, int dif, int sdif)
76{
77 bool is_multicast = ipv6_addr_is_multicast(loc_addr);
78
79 sk_for_each_from(sk)
80 if (inet_sk(sk)->inet_num == num) {
81
82 if (!net_eq(sock_net(sk), net))
83 continue;
84
85 if (!ipv6_addr_any(&sk->sk_v6_daddr) &&
86 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr))
87 continue;
88
89 if (sk->sk_bound_dev_if &&
90 sk->sk_bound_dev_if != dif &&
91 sk->sk_bound_dev_if != sdif)
92 continue;
93
94 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
95 if (ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))
96 goto found;
97 if (is_multicast &&
98 inet6_mc_check(sk, loc_addr, rmt_addr))
99 goto found;
100 continue;
101 }
102 goto found;
103 }
104 sk = NULL;
105found:
106 return sk;
107}
108EXPORT_SYMBOL_GPL(__raw_v6_lookup);
109
110/*
111 * 0 - deliver
112 * 1 - block
113 */
114static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
115{
116 struct icmp6hdr _hdr;
117 const struct icmp6hdr *hdr;
118
119 /* We require only the four bytes of the ICMPv6 header, not any
120 * additional bytes of message body in "struct icmp6hdr".
121 */
122 hdr = skb_header_pointer(skb, skb_transport_offset(skb),
123 ICMPV6_HDRLEN, &_hdr);
124 if (hdr) {
125 const __u32 *data = &raw6_sk(sk)->filter.data[0];
126 unsigned int type = hdr->icmp6_type;
127
128 return (data[type >> 5] & (1U << (type & 31))) != 0;
129 }
130 return 1;
131}
132
133#if IS_ENABLED(CONFIG_IPV6_MIP6)
134typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
135
136static mh_filter_t __rcu *mh_filter __read_mostly;
137
138int rawv6_mh_filter_register(mh_filter_t filter)
139{
140 rcu_assign_pointer(mh_filter, filter);
141 return 0;
142}
143EXPORT_SYMBOL(rawv6_mh_filter_register);
144
145int rawv6_mh_filter_unregister(mh_filter_t filter)
146{
147 RCU_INIT_POINTER(mh_filter, NULL);
148 synchronize_rcu();
149 return 0;
150}
151EXPORT_SYMBOL(rawv6_mh_filter_unregister);
152
153#endif
154
155/*
156 * demultiplex raw sockets.
157 * (should consider queueing the skb in the sock receive_queue
158 * without calling rawv6.c)
159 *
160 * Caller owns SKB so we must make clones.
161 */
162static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
163{
164 const struct in6_addr *saddr;
165 const struct in6_addr *daddr;
166 struct sock *sk;
167 bool delivered = false;
168 __u8 hash;
169 struct net *net;
170
171 saddr = &ipv6_hdr(skb)->saddr;
172 daddr = saddr + 1;
173
174 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
175
176 read_lock(&raw_v6_hashinfo.lock);
177 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
178
179 if (!sk)
180 goto out;
181
182 net = dev_net(skb->dev);
183 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr,
184 inet6_iif(skb), inet6_sdif(skb));
185
186 while (sk) {
187 int filtered;
188
189 delivered = true;
190 switch (nexthdr) {
191 case IPPROTO_ICMPV6:
192 filtered = icmpv6_filter(sk, skb);
193 break;
194
195#if IS_ENABLED(CONFIG_IPV6_MIP6)
196 case IPPROTO_MH:
197 {
198 /* XXX: To validate MH only once for each packet,
199 * this is placed here. It should be after checking
200 * xfrm policy, however it doesn't. The checking xfrm
201 * policy is placed in rawv6_rcv() because it is
202 * required for each socket.
203 */
204 mh_filter_t *filter;
205
206 filter = rcu_dereference(mh_filter);
207 filtered = filter ? (*filter)(sk, skb) : 0;
208 break;
209 }
210#endif
211 default:
212 filtered = 0;
213 break;
214 }
215
216 if (filtered < 0)
217 break;
218 if (filtered == 0) {
219 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
220
221 /* Not releasing hash table! */
222 if (clone) {
223 nf_reset(clone);
224 rawv6_rcv(sk, clone);
225 }
226 }
227 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
228 inet6_iif(skb), inet6_sdif(skb));
229 }
230out:
231 read_unlock(&raw_v6_hashinfo.lock);
232 return delivered;
233}
234
235bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
236{
237 struct sock *raw_sk;
238
239 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]);
240 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
241 raw_sk = NULL;
242
243 return raw_sk != NULL;
244}
245
246/* This cleans up af_inet6 a bit. -DaveM */
247static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
248{
249 struct inet_sock *inet = inet_sk(sk);
250 struct ipv6_pinfo *np = inet6_sk(sk);
251 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
252 __be32 v4addr = 0;
253 int addr_type;
254 int err;
255
256 if (addr_len < SIN6_LEN_RFC2133)
257 return -EINVAL;
258
259 if (addr->sin6_family != AF_INET6)
260 return -EINVAL;
261
262 addr_type = ipv6_addr_type(&addr->sin6_addr);
263
264 /* Raw sockets are IPv6 only */
265 if (addr_type == IPV6_ADDR_MAPPED)
266 return -EADDRNOTAVAIL;
267
268 lock_sock(sk);
269
270 err = -EINVAL;
271 if (sk->sk_state != TCP_CLOSE)
272 goto out;
273
274 rcu_read_lock();
275 /* Check if the address belongs to the host. */
276 if (addr_type != IPV6_ADDR_ANY) {
277 struct net_device *dev = NULL;
278
279 if (__ipv6_addr_needs_scope_id(addr_type)) {
280 if (addr_len >= sizeof(struct sockaddr_in6) &&
281 addr->sin6_scope_id) {
282 /* Override any existing binding, if another
283 * one is supplied by user.
284 */
285 sk->sk_bound_dev_if = addr->sin6_scope_id;
286 }
287
288 /* Binding to link-local address requires an interface */
289 if (!sk->sk_bound_dev_if)
290 goto out_unlock;
291
292 err = -ENODEV;
293 dev = dev_get_by_index_rcu(sock_net(sk),
294 sk->sk_bound_dev_if);
295 if (!dev)
296 goto out_unlock;
297 }
298
299 /* ipv4 addr of the socket is invalid. Only the
300 * unspecified and mapped address have a v4 equivalent.
301 */
302 v4addr = LOOPBACK4_IPV6;
303 if (!(addr_type & IPV6_ADDR_MULTICAST) &&
304 !sock_net(sk)->ipv6.sysctl.ip_nonlocal_bind) {
305 err = -EADDRNOTAVAIL;
306 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
307 dev, 0)) {
308 goto out_unlock;
309 }
310 }
311 }
312
313 inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
314 sk->sk_v6_rcv_saddr = addr->sin6_addr;
315 if (!(addr_type & IPV6_ADDR_MULTICAST))
316 np->saddr = addr->sin6_addr;
317 err = 0;
318out_unlock:
319 rcu_read_unlock();
320out:
321 release_sock(sk);
322 return err;
323}
324
325static void rawv6_err(struct sock *sk, struct sk_buff *skb,
326 struct inet6_skb_parm *opt,
327 u8 type, u8 code, int offset, __be32 info)
328{
329 struct inet_sock *inet = inet_sk(sk);
330 struct ipv6_pinfo *np = inet6_sk(sk);
331 int err;
332 int harderr;
333
334 /* Report error on raw socket, if:
335 1. User requested recverr.
336 2. Socket is connected (otherwise the error indication
337 is useless without recverr and error is hard.
338 */
339 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
340 return;
341
342 harderr = icmpv6_err_convert(type, code, &err);
343 if (type == ICMPV6_PKT_TOOBIG) {
344 ip6_sk_update_pmtu(skb, sk, info);
345 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
346 }
347 if (type == NDISC_REDIRECT) {
348 ip6_sk_redirect(skb, sk);
349 return;
350 }
351 if (np->recverr) {
352 u8 *payload = skb->data;
353 if (!inet->hdrincl)
354 payload += offset;
355 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
356 }
357
358 if (np->recverr || harderr) {
359 sk->sk_err = err;
360 sk->sk_error_report(sk);
361 }
362}
363
364void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
365 u8 type, u8 code, int inner_offset, __be32 info)
366{
367 struct sock *sk;
368 int hash;
369 const struct in6_addr *saddr, *daddr;
370 struct net *net;
371
372 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
373
374 read_lock(&raw_v6_hashinfo.lock);
375 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
376 if (sk) {
377 /* Note: ipv6_hdr(skb) != skb->data */
378 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
379 saddr = &ip6h->saddr;
380 daddr = &ip6h->daddr;
381 net = dev_net(skb->dev);
382
383 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
384 inet6_iif(skb), inet6_iif(skb)))) {
385 rawv6_err(sk, skb, NULL, type, code,
386 inner_offset, info);
387 sk = sk_next(sk);
388 }
389 }
390 read_unlock(&raw_v6_hashinfo.lock);
391}
392
393static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
394{
395 if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
396 skb_checksum_complete(skb)) {
397 atomic_inc(&sk->sk_drops);
398 kfree_skb(skb);
399 return NET_RX_DROP;
400 }
401
402 /* Charge it to the socket. */
403 skb_dst_drop(skb);
404 if (sock_queue_rcv_skb(sk, skb) < 0) {
405 kfree_skb(skb);
406 return NET_RX_DROP;
407 }
408
409 return 0;
410}
411
412/*
413 * This is next to useless...
414 * if we demultiplex in network layer we don't need the extra call
415 * just to queue the skb...
416 * maybe we could have the network decide upon a hint if it
417 * should call raw_rcv for demultiplexing
418 */
419int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
420{
421 struct inet_sock *inet = inet_sk(sk);
422 struct raw6_sock *rp = raw6_sk(sk);
423
424 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
425 atomic_inc(&sk->sk_drops);
426 kfree_skb(skb);
427 return NET_RX_DROP;
428 }
429
430 if (!rp->checksum)
431 skb->ip_summed = CHECKSUM_UNNECESSARY;
432
433 if (skb->ip_summed == CHECKSUM_COMPLETE) {
434 skb_postpull_rcsum(skb, skb_network_header(skb),
435 skb_network_header_len(skb));
436 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
437 &ipv6_hdr(skb)->daddr,
438 skb->len, inet->inet_num, skb->csum))
439 skb->ip_summed = CHECKSUM_UNNECESSARY;
440 }
441 if (!skb_csum_unnecessary(skb))
442 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
443 &ipv6_hdr(skb)->daddr,
444 skb->len,
445 inet->inet_num, 0));
446
447 if (inet->hdrincl) {
448 if (skb_checksum_complete(skb)) {
449 atomic_inc(&sk->sk_drops);
450 kfree_skb(skb);
451 return NET_RX_DROP;
452 }
453 }
454
455 rawv6_rcv_skb(sk, skb);
456 return 0;
457}
458
459
460/*
461 * This should be easy, if there is something there
462 * we return it, otherwise we block.
463 */
464
465static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
466 int noblock, int flags, int *addr_len)
467{
468 struct ipv6_pinfo *np = inet6_sk(sk);
469 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
470 struct sk_buff *skb;
471 size_t copied;
472 int err;
473
474 if (flags & MSG_OOB)
475 return -EOPNOTSUPP;
476
477 if (flags & MSG_ERRQUEUE)
478 return ipv6_recv_error(sk, msg, len, addr_len);
479
480 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
481 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
482
483 skb = skb_recv_datagram(sk, flags, noblock, &err);
484 if (!skb)
485 goto out;
486
487 copied = skb->len;
488 if (copied > len) {
489 copied = len;
490 msg->msg_flags |= MSG_TRUNC;
491 }
492
493 if (skb_csum_unnecessary(skb)) {
494 err = skb_copy_datagram_msg(skb, 0, msg, copied);
495 } else if (msg->msg_flags&MSG_TRUNC) {
496 if (__skb_checksum_complete(skb))
497 goto csum_copy_err;
498 err = skb_copy_datagram_msg(skb, 0, msg, copied);
499 } else {
500 err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
501 if (err == -EINVAL)
502 goto csum_copy_err;
503 }
504 if (err)
505 goto out_free;
506
507 /* Copy the address. */
508 if (sin6) {
509 sin6->sin6_family = AF_INET6;
510 sin6->sin6_port = 0;
511 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
512 sin6->sin6_flowinfo = 0;
513 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
514 inet6_iif(skb));
515 *addr_len = sizeof(*sin6);
516 }
517
518 sock_recv_ts_and_drops(msg, sk, skb);
519
520 if (np->rxopt.all)
521 ip6_datagram_recv_ctl(sk, msg, skb);
522
523 err = copied;
524 if (flags & MSG_TRUNC)
525 err = skb->len;
526
527out_free:
528 skb_free_datagram(sk, skb);
529out:
530 return err;
531
532csum_copy_err:
533 skb_kill_datagram(sk, skb, flags);
534
535 /* Error for blocking case is chosen to masquerade
536 as some normal condition.
537 */
538 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
539 goto out;
540}
541
542static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
543 struct raw6_sock *rp)
544{
545 struct sk_buff *skb;
546 int err = 0;
547 int offset;
548 int len;
549 int total_len;
550 __wsum tmp_csum;
551 __sum16 csum;
552
553 if (!rp->checksum)
554 goto send;
555
556 skb = skb_peek(&sk->sk_write_queue);
557 if (!skb)
558 goto out;
559
560 offset = rp->offset;
561 total_len = inet_sk(sk)->cork.base.length;
562 if (offset >= total_len - 1) {
563 err = -EINVAL;
564 ip6_flush_pending_frames(sk);
565 goto out;
566 }
567
568 /* should be check HW csum miyazawa */
569 if (skb_queue_len(&sk->sk_write_queue) == 1) {
570 /*
571 * Only one fragment on the socket.
572 */
573 tmp_csum = skb->csum;
574 } else {
575 struct sk_buff *csum_skb = NULL;
576 tmp_csum = 0;
577
578 skb_queue_walk(&sk->sk_write_queue, skb) {
579 tmp_csum = csum_add(tmp_csum, skb->csum);
580
581 if (csum_skb)
582 continue;
583
584 len = skb->len - skb_transport_offset(skb);
585 if (offset >= len) {
586 offset -= len;
587 continue;
588 }
589
590 csum_skb = skb;
591 }
592
593 skb = csum_skb;
594 }
595
596 offset += skb_transport_offset(skb);
597 err = skb_copy_bits(skb, offset, &csum, 2);
598 if (err < 0) {
599 ip6_flush_pending_frames(sk);
600 goto out;
601 }
602
603 /* in case cksum was not initialized */
604 if (unlikely(csum))
605 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
606
607 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
608 total_len, fl6->flowi6_proto, tmp_csum);
609
610 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
611 csum = CSUM_MANGLED_0;
612
613 BUG_ON(skb_store_bits(skb, offset, &csum, 2));
614
615send:
616 err = ip6_push_pending_frames(sk);
617out:
618 return err;
619}
620
621static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
622 struct flowi6 *fl6, struct dst_entry **dstp,
623 unsigned int flags)
624{
625 struct ipv6_pinfo *np = inet6_sk(sk);
626 struct net *net = sock_net(sk);
627 struct ipv6hdr *iph;
628 struct sk_buff *skb;
629 int err;
630 struct rt6_info *rt = (struct rt6_info *)*dstp;
631 int hlen = LL_RESERVED_SPACE(rt->dst.dev);
632 int tlen = rt->dst.dev->needed_tailroom;
633
634 if (length > rt->dst.dev->mtu) {
635 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
636 return -EMSGSIZE;
637 }
638 if (length < sizeof(struct ipv6hdr))
639 return -EINVAL;
640 if (flags&MSG_PROBE)
641 goto out;
642
643 skb = sock_alloc_send_skb(sk,
644 length + hlen + tlen + 15,
645 flags & MSG_DONTWAIT, &err);
646 if (!skb)
647 goto error;
648 skb_reserve(skb, hlen);
649
650 skb->protocol = htons(ETH_P_IPV6);
651 skb->priority = sk->sk_priority;
652 skb->mark = sk->sk_mark;
653 skb_dst_set(skb, &rt->dst);
654 *dstp = NULL;
655
656 skb_put(skb, length);
657 skb_reset_network_header(skb);
658 iph = ipv6_hdr(skb);
659
660 skb->ip_summed = CHECKSUM_NONE;
661
662 if (flags & MSG_CONFIRM)
663 skb_set_dst_pending_confirm(skb, 1);
664
665 skb->transport_header = skb->network_header;
666 err = memcpy_from_msg(iph, msg, length);
667 if (err)
668 goto error_fault;
669
670 /* if egress device is enslaved to an L3 master device pass the
671 * skb to its handler for processing
672 */
673 skb = l3mdev_ip6_out(sk, skb);
674 if (unlikely(!skb))
675 return 0;
676
677 IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
678 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
679 NULL, rt->dst.dev, dst_output);
680 if (err > 0)
681 err = net_xmit_errno(err);
682 if (err)
683 goto error;
684out:
685 return 0;
686
687error_fault:
688 err = -EFAULT;
689 kfree_skb(skb);
690error:
691 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
692 if (err == -ENOBUFS && !np->recverr)
693 err = 0;
694 return err;
695}
696
697struct raw6_frag_vec {
698 struct msghdr *msg;
699 int hlen;
700 char c[4];
701};
702
703static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
704{
705 int err = 0;
706 switch (fl6->flowi6_proto) {
707 case IPPROTO_ICMPV6:
708 rfv->hlen = 2;
709 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
710 if (!err) {
711 fl6->fl6_icmp_type = rfv->c[0];
712 fl6->fl6_icmp_code = rfv->c[1];
713 }
714 break;
715 case IPPROTO_MH:
716 rfv->hlen = 4;
717 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
718 if (!err)
719 fl6->fl6_mh_type = rfv->c[2];
720 }
721 return err;
722}
723
724static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
725 struct sk_buff *skb)
726{
727 struct raw6_frag_vec *rfv = from;
728
729 if (offset < rfv->hlen) {
730 int copy = min(rfv->hlen - offset, len);
731
732 if (skb->ip_summed == CHECKSUM_PARTIAL)
733 memcpy(to, rfv->c + offset, copy);
734 else
735 skb->csum = csum_block_add(
736 skb->csum,
737 csum_partial_copy_nocheck(rfv->c + offset,
738 to, copy, 0),
739 odd);
740
741 odd = 0;
742 offset += copy;
743 to += copy;
744 len -= copy;
745
746 if (!len)
747 return 0;
748 }
749
750 offset -= rfv->hlen;
751
752 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
753}
754
755static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
756{
757 struct ipv6_txoptions *opt_to_free = NULL;
758 struct ipv6_txoptions opt_space;
759 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
760 struct in6_addr *daddr, *final_p, final;
761 struct inet_sock *inet = inet_sk(sk);
762 struct ipv6_pinfo *np = inet6_sk(sk);
763 struct raw6_sock *rp = raw6_sk(sk);
764 struct ipv6_txoptions *opt = NULL;
765 struct ip6_flowlabel *flowlabel = NULL;
766 struct dst_entry *dst = NULL;
767 struct raw6_frag_vec rfv;
768 struct flowi6 fl6;
769 struct sockcm_cookie sockc;
770 struct ipcm6_cookie ipc6;
771 int addr_len = msg->msg_namelen;
772 u16 proto;
773 int err;
774
775 /* Rough check on arithmetic overflow,
776 better check is made in ip6_append_data().
777 */
778 if (len > INT_MAX)
779 return -EMSGSIZE;
780
781 /* Mirror BSD error message compatibility */
782 if (msg->msg_flags & MSG_OOB)
783 return -EOPNOTSUPP;
784
785 /*
786 * Get and verify the address.
787 */
788 memset(&fl6, 0, sizeof(fl6));
789
790 fl6.flowi6_mark = sk->sk_mark;
791 fl6.flowi6_uid = sk->sk_uid;
792
793 ipc6.hlimit = -1;
794 ipc6.tclass = -1;
795 ipc6.dontfrag = -1;
796 ipc6.opt = NULL;
797
798 if (sin6) {
799 if (addr_len < SIN6_LEN_RFC2133)
800 return -EINVAL;
801
802 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
803 return -EAFNOSUPPORT;
804
805 /* port is the proto value [0..255] carried in nexthdr */
806 proto = ntohs(sin6->sin6_port);
807
808 if (!proto)
809 proto = inet->inet_num;
810 else if (proto != inet->inet_num)
811 return -EINVAL;
812
813 if (proto > 255)
814 return -EINVAL;
815
816 daddr = &sin6->sin6_addr;
817 if (np->sndflow) {
818 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
819 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
820 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
821 if (!flowlabel)
822 return -EINVAL;
823 }
824 }
825
826 /*
827 * Otherwise it will be difficult to maintain
828 * sk->sk_dst_cache.
829 */
830 if (sk->sk_state == TCP_ESTABLISHED &&
831 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
832 daddr = &sk->sk_v6_daddr;
833
834 if (addr_len >= sizeof(struct sockaddr_in6) &&
835 sin6->sin6_scope_id &&
836 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
837 fl6.flowi6_oif = sin6->sin6_scope_id;
838 } else {
839 if (sk->sk_state != TCP_ESTABLISHED)
840 return -EDESTADDRREQ;
841
842 proto = inet->inet_num;
843 daddr = &sk->sk_v6_daddr;
844 fl6.flowlabel = np->flow_label;
845 }
846
847 if (fl6.flowi6_oif == 0)
848 fl6.flowi6_oif = sk->sk_bound_dev_if;
849
850 sockc.tsflags = sk->sk_tsflags;
851 if (msg->msg_controllen) {
852 opt = &opt_space;
853 memset(opt, 0, sizeof(struct ipv6_txoptions));
854 opt->tot_len = sizeof(struct ipv6_txoptions);
855 ipc6.opt = opt;
856
857 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc);
858 if (err < 0) {
859 fl6_sock_release(flowlabel);
860 return err;
861 }
862 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
863 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
864 if (!flowlabel)
865 return -EINVAL;
866 }
867 if (!(opt->opt_nflen|opt->opt_flen))
868 opt = NULL;
869 }
870 if (!opt) {
871 opt = txopt_get(np);
872 opt_to_free = opt;
873 }
874 if (flowlabel)
875 opt = fl6_merge_options(&opt_space, flowlabel, opt);
876 opt = ipv6_fixup_options(&opt_space, opt);
877
878 fl6.flowi6_proto = proto;
879 rfv.msg = msg;
880 rfv.hlen = 0;
881 err = rawv6_probe_proto_opt(&rfv, &fl6);
882 if (err)
883 goto out;
884
885 if (!ipv6_addr_any(daddr))
886 fl6.daddr = *daddr;
887 else
888 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
889 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
890 fl6.saddr = np->saddr;
891
892 final_p = fl6_update_dst(&fl6, opt, &final);
893
894 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
895 fl6.flowi6_oif = np->mcast_oif;
896 else if (!fl6.flowi6_oif)
897 fl6.flowi6_oif = np->ucast_oif;
898 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
899
900 if (inet->hdrincl)
901 fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH;
902
903 if (ipc6.tclass < 0)
904 ipc6.tclass = np->tclass;
905
906 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
907
908 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
909 if (IS_ERR(dst)) {
910 err = PTR_ERR(dst);
911 goto out;
912 }
913 if (ipc6.hlimit < 0)
914 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
915
916 if (ipc6.dontfrag < 0)
917 ipc6.dontfrag = np->dontfrag;
918
919 if (msg->msg_flags&MSG_CONFIRM)
920 goto do_confirm;
921
922back_from_confirm:
923 if (inet->hdrincl)
924 err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst, msg->msg_flags);
925 else {
926 ipc6.opt = opt;
927 lock_sock(sk);
928 err = ip6_append_data(sk, raw6_getfrag, &rfv,
929 len, 0, &ipc6, &fl6, (struct rt6_info *)dst,
930 msg->msg_flags, &sockc);
931
932 if (err)
933 ip6_flush_pending_frames(sk);
934 else if (!(msg->msg_flags & MSG_MORE))
935 err = rawv6_push_pending_frames(sk, &fl6, rp);
936 release_sock(sk);
937 }
938done:
939 dst_release(dst);
940out:
941 fl6_sock_release(flowlabel);
942 txopt_put(opt_to_free);
943 return err < 0 ? err : len;
944do_confirm:
945 if (msg->msg_flags & MSG_PROBE)
946 dst_confirm_neigh(dst, &fl6.daddr);
947 if (!(msg->msg_flags & MSG_PROBE) || len)
948 goto back_from_confirm;
949 err = 0;
950 goto done;
951}
952
953static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
954 char __user *optval, int optlen)
955{
956 switch (optname) {
957 case ICMPV6_FILTER:
958 if (optlen > sizeof(struct icmp6_filter))
959 optlen = sizeof(struct icmp6_filter);
960 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
961 return -EFAULT;
962 return 0;
963 default:
964 return -ENOPROTOOPT;
965 }
966
967 return 0;
968}
969
970static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
971 char __user *optval, int __user *optlen)
972{
973 int len;
974
975 switch (optname) {
976 case ICMPV6_FILTER:
977 if (get_user(len, optlen))
978 return -EFAULT;
979 if (len < 0)
980 return -EINVAL;
981 if (len > sizeof(struct icmp6_filter))
982 len = sizeof(struct icmp6_filter);
983 if (put_user(len, optlen))
984 return -EFAULT;
985 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
986 return -EFAULT;
987 return 0;
988 default:
989 return -ENOPROTOOPT;
990 }
991
992 return 0;
993}
994
995
996static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
997 char __user *optval, unsigned int optlen)
998{
999 struct raw6_sock *rp = raw6_sk(sk);
1000 int val;
1001
1002 if (get_user(val, (int __user *)optval))
1003 return -EFAULT;
1004
1005 switch (optname) {
1006 case IPV6_HDRINCL:
1007 if (sk->sk_type != SOCK_RAW)
1008 return -EINVAL;
1009 inet_sk(sk)->hdrincl = !!val;
1010 return 0;
1011 case IPV6_CHECKSUM:
1012 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
1013 level == IPPROTO_IPV6) {
1014 /*
1015 * RFC3542 tells that IPV6_CHECKSUM socket
1016 * option in the IPPROTO_IPV6 level is not
1017 * allowed on ICMPv6 sockets.
1018 * If you want to set it, use IPPROTO_RAW
1019 * level IPV6_CHECKSUM socket option
1020 * (Linux extension).
1021 */
1022 return -EINVAL;
1023 }
1024
1025 /* You may get strange result with a positive odd offset;
1026 RFC2292bis agrees with me. */
1027 if (val > 0 && (val&1))
1028 return -EINVAL;
1029 if (val < 0) {
1030 rp->checksum = 0;
1031 } else {
1032 rp->checksum = 1;
1033 rp->offset = val;
1034 }
1035
1036 return 0;
1037
1038 default:
1039 return -ENOPROTOOPT;
1040 }
1041}
1042
1043static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1044 char __user *optval, unsigned int optlen)
1045{
1046 switch (level) {
1047 case SOL_RAW:
1048 break;
1049
1050 case SOL_ICMPV6:
1051 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1052 return -EOPNOTSUPP;
1053 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1054 case SOL_IPV6:
1055 if (optname == IPV6_CHECKSUM ||
1056 optname == IPV6_HDRINCL)
1057 break;
1058 /* fall through */
1059 default:
1060 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1061 }
1062
1063 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1064}
1065
1066#ifdef CONFIG_COMPAT
1067static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1068 char __user *optval, unsigned int optlen)
1069{
1070 switch (level) {
1071 case SOL_RAW:
1072 break;
1073 case SOL_ICMPV6:
1074 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1075 return -EOPNOTSUPP;
1076 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1077 case SOL_IPV6:
1078 if (optname == IPV6_CHECKSUM ||
1079 optname == IPV6_HDRINCL)
1080 break;
1081 /* fall through */
1082 default:
1083 return compat_ipv6_setsockopt(sk, level, optname,
1084 optval, optlen);
1085 }
1086 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1087}
1088#endif
1089
1090static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1091 char __user *optval, int __user *optlen)
1092{
1093 struct raw6_sock *rp = raw6_sk(sk);
1094 int val, len;
1095
1096 if (get_user(len, optlen))
1097 return -EFAULT;
1098
1099 switch (optname) {
1100 case IPV6_HDRINCL:
1101 val = inet_sk(sk)->hdrincl;
1102 break;
1103 case IPV6_CHECKSUM:
1104 /*
1105 * We allow getsockopt() for IPPROTO_IPV6-level
1106 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1107 * since RFC3542 is silent about it.
1108 */
1109 if (rp->checksum == 0)
1110 val = -1;
1111 else
1112 val = rp->offset;
1113 break;
1114
1115 default:
1116 return -ENOPROTOOPT;
1117 }
1118
1119 len = min_t(unsigned int, sizeof(int), len);
1120
1121 if (put_user(len, optlen))
1122 return -EFAULT;
1123 if (copy_to_user(optval, &val, len))
1124 return -EFAULT;
1125 return 0;
1126}
1127
1128static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1129 char __user *optval, int __user *optlen)
1130{
1131 switch (level) {
1132 case SOL_RAW:
1133 break;
1134
1135 case SOL_ICMPV6:
1136 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1137 return -EOPNOTSUPP;
1138 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1139 case SOL_IPV6:
1140 if (optname == IPV6_CHECKSUM ||
1141 optname == IPV6_HDRINCL)
1142 break;
1143 /* fall through */
1144 default:
1145 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1146 }
1147
1148 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1149}
1150
1151#ifdef CONFIG_COMPAT
1152static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1153 char __user *optval, int __user *optlen)
1154{
1155 switch (level) {
1156 case SOL_RAW:
1157 break;
1158 case SOL_ICMPV6:
1159 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1160 return -EOPNOTSUPP;
1161 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1162 case SOL_IPV6:
1163 if (optname == IPV6_CHECKSUM ||
1164 optname == IPV6_HDRINCL)
1165 break;
1166 /* fall through */
1167 default:
1168 return compat_ipv6_getsockopt(sk, level, optname,
1169 optval, optlen);
1170 }
1171 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1172}
1173#endif
1174
1175static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1176{
1177 switch (cmd) {
1178 case SIOCOUTQ: {
1179 int amount = sk_wmem_alloc_get(sk);
1180
1181 return put_user(amount, (int __user *)arg);
1182 }
1183 case SIOCINQ: {
1184 struct sk_buff *skb;
1185 int amount = 0;
1186
1187 spin_lock_bh(&sk->sk_receive_queue.lock);
1188 skb = skb_peek(&sk->sk_receive_queue);
1189 if (skb)
1190 amount = skb->len;
1191 spin_unlock_bh(&sk->sk_receive_queue.lock);
1192 return put_user(amount, (int __user *)arg);
1193 }
1194
1195 default:
1196#ifdef CONFIG_IPV6_MROUTE
1197 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1198#else
1199 return -ENOIOCTLCMD;
1200#endif
1201 }
1202}
1203
1204#ifdef CONFIG_COMPAT
1205static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1206{
1207 switch (cmd) {
1208 case SIOCOUTQ:
1209 case SIOCINQ:
1210 return -ENOIOCTLCMD;
1211 default:
1212#ifdef CONFIG_IPV6_MROUTE
1213 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1214#else
1215 return -ENOIOCTLCMD;
1216#endif
1217 }
1218}
1219#endif
1220
1221static void rawv6_close(struct sock *sk, long timeout)
1222{
1223 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1224 ip6_ra_control(sk, -1);
1225 ip6mr_sk_done(sk);
1226 sk_common_release(sk);
1227}
1228
1229static void raw6_destroy(struct sock *sk)
1230{
1231 lock_sock(sk);
1232 ip6_flush_pending_frames(sk);
1233 release_sock(sk);
1234
1235 inet6_destroy_sock(sk);
1236}
1237
1238static int rawv6_init_sk(struct sock *sk)
1239{
1240 struct raw6_sock *rp = raw6_sk(sk);
1241
1242 switch (inet_sk(sk)->inet_num) {
1243 case IPPROTO_ICMPV6:
1244 rp->checksum = 1;
1245 rp->offset = 2;
1246 break;
1247 case IPPROTO_MH:
1248 rp->checksum = 1;
1249 rp->offset = 4;
1250 break;
1251 default:
1252 break;
1253 }
1254 return 0;
1255}
1256
1257struct proto rawv6_prot = {
1258 .name = "RAWv6",
1259 .owner = THIS_MODULE,
1260 .close = rawv6_close,
1261 .destroy = raw6_destroy,
1262 .connect = ip6_datagram_connect_v6_only,
1263 .disconnect = __udp_disconnect,
1264 .ioctl = rawv6_ioctl,
1265 .init = rawv6_init_sk,
1266 .setsockopt = rawv6_setsockopt,
1267 .getsockopt = rawv6_getsockopt,
1268 .sendmsg = rawv6_sendmsg,
1269 .recvmsg = rawv6_recvmsg,
1270 .bind = rawv6_bind,
1271 .backlog_rcv = rawv6_rcv_skb,
1272 .hash = raw_hash_sk,
1273 .unhash = raw_unhash_sk,
1274 .obj_size = sizeof(struct raw6_sock),
1275 .useroffset = offsetof(struct raw6_sock, filter),
1276 .usersize = sizeof_field(struct raw6_sock, filter),
1277 .h.raw_hash = &raw_v6_hashinfo,
1278#ifdef CONFIG_COMPAT
1279 .compat_setsockopt = compat_rawv6_setsockopt,
1280 .compat_getsockopt = compat_rawv6_getsockopt,
1281 .compat_ioctl = compat_rawv6_ioctl,
1282#endif
1283 .diag_destroy = raw_abort,
1284};
1285
1286#ifdef CONFIG_PROC_FS
1287static int raw6_seq_show(struct seq_file *seq, void *v)
1288{
1289 if (v == SEQ_START_TOKEN) {
1290 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1291 } else {
1292 struct sock *sp = v;
1293 __u16 srcp = inet_sk(sp)->inet_num;
1294 ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1295 raw_seq_private(seq)->bucket);
1296 }
1297 return 0;
1298}
1299
1300static const struct seq_operations raw6_seq_ops = {
1301 .start = raw_seq_start,
1302 .next = raw_seq_next,
1303 .stop = raw_seq_stop,
1304 .show = raw6_seq_show,
1305};
1306
1307static int raw6_seq_open(struct inode *inode, struct file *file)
1308{
1309 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1310}
1311
1312static const struct file_operations raw6_seq_fops = {
1313 .open = raw6_seq_open,
1314 .read = seq_read,
1315 .llseek = seq_lseek,
1316 .release = seq_release_net,
1317};
1318
1319static int __net_init raw6_init_net(struct net *net)
1320{
1321 if (!proc_create("raw6", 0444, net->proc_net, &raw6_seq_fops))
1322 return -ENOMEM;
1323
1324 return 0;
1325}
1326
1327static void __net_exit raw6_exit_net(struct net *net)
1328{
1329 remove_proc_entry("raw6", net->proc_net);
1330}
1331
1332static struct pernet_operations raw6_net_ops = {
1333 .init = raw6_init_net,
1334 .exit = raw6_exit_net,
1335};
1336
1337int __init raw6_proc_init(void)
1338{
1339 return register_pernet_subsys(&raw6_net_ops);
1340}
1341
1342void raw6_proc_exit(void)
1343{
1344 unregister_pernet_subsys(&raw6_net_ops);
1345}
1346#endif /* CONFIG_PROC_FS */
1347
1348/* Same as inet6_dgram_ops, sans udp_poll. */
1349const struct proto_ops inet6_sockraw_ops = {
1350 .family = PF_INET6,
1351 .owner = THIS_MODULE,
1352 .release = inet6_release,
1353 .bind = inet6_bind,
1354 .connect = inet_dgram_connect, /* ok */
1355 .socketpair = sock_no_socketpair, /* a do nothing */
1356 .accept = sock_no_accept, /* a do nothing */
1357 .getname = inet6_getname,
1358 .poll = datagram_poll, /* ok */
1359 .ioctl = inet6_ioctl, /* must change */
1360 .listen = sock_no_listen, /* ok */
1361 .shutdown = inet_shutdown, /* ok */
1362 .setsockopt = sock_common_setsockopt, /* ok */
1363 .getsockopt = sock_common_getsockopt, /* ok */
1364 .sendmsg = inet_sendmsg, /* ok */
1365 .recvmsg = sock_common_recvmsg, /* ok */
1366 .mmap = sock_no_mmap,
1367 .sendpage = sock_no_sendpage,
1368#ifdef CONFIG_COMPAT
1369 .compat_setsockopt = compat_sock_common_setsockopt,
1370 .compat_getsockopt = compat_sock_common_getsockopt,
1371#endif
1372};
1373
1374static struct inet_protosw rawv6_protosw = {
1375 .type = SOCK_RAW,
1376 .protocol = IPPROTO_IP, /* wild card */
1377 .prot = &rawv6_prot,
1378 .ops = &inet6_sockraw_ops,
1379 .flags = INET_PROTOSW_REUSE,
1380};
1381
1382int __init rawv6_init(void)
1383{
1384 return inet6_register_protosw(&rawv6_protosw);
1385}
1386
1387void rawv6_exit(void)
1388{
1389 inet6_unregister_protosw(&rawv6_protosw);
1390}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * RAW sockets for IPv6
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Adapted from linux/net/ipv4/raw.c
10 *
11 * Fixes:
12 * Hideaki YOSHIFUJI : sin6_scope_id support
13 * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance)
14 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
15 */
16
17#include <linux/errno.h>
18#include <linux/types.h>
19#include <linux/socket.h>
20#include <linux/slab.h>
21#include <linux/sockios.h>
22#include <linux/net.h>
23#include <linux/in6.h>
24#include <linux/netdevice.h>
25#include <linux/if_arp.h>
26#include <linux/icmpv6.h>
27#include <linux/netfilter.h>
28#include <linux/netfilter_ipv6.h>
29#include <linux/skbuff.h>
30#include <linux/compat.h>
31#include <linux/uaccess.h>
32#include <asm/ioctls.h>
33
34#include <net/net_namespace.h>
35#include <net/ip.h>
36#include <net/sock.h>
37#include <net/snmp.h>
38
39#include <net/ipv6.h>
40#include <net/ndisc.h>
41#include <net/protocol.h>
42#include <net/ip6_route.h>
43#include <net/ip6_checksum.h>
44#include <net/addrconf.h>
45#include <net/transp_v6.h>
46#include <net/udp.h>
47#include <net/inet_common.h>
48#include <net/tcp_states.h>
49#if IS_ENABLED(CONFIG_IPV6_MIP6)
50#include <net/mip6.h>
51#endif
52#include <linux/mroute6.h>
53
54#include <net/raw.h>
55#include <net/rawv6.h>
56#include <net/xfrm.h>
57
58#include <linux/proc_fs.h>
59#include <linux/seq_file.h>
60#include <linux/export.h>
61
62#define ICMPV6_HDRLEN 4 /* ICMPv6 header, RFC 4443 Section 2.1 */
63
64struct raw_hashinfo raw_v6_hashinfo;
65EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
66
67bool raw_v6_match(struct net *net, const struct sock *sk, unsigned short num,
68 const struct in6_addr *loc_addr,
69 const struct in6_addr *rmt_addr, int dif, int sdif)
70{
71 if (inet_sk(sk)->inet_num != num ||
72 !net_eq(sock_net(sk), net) ||
73 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
74 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
75 !raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
76 dif, sdif))
77 return false;
78
79 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
80 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr) ||
81 (ipv6_addr_is_multicast(loc_addr) &&
82 inet6_mc_check(sk, loc_addr, rmt_addr)))
83 return true;
84
85 return false;
86}
87EXPORT_SYMBOL_GPL(raw_v6_match);
88
89/*
90 * 0 - deliver
91 * 1 - block
92 */
93static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
94{
95 struct icmp6hdr _hdr;
96 const struct icmp6hdr *hdr;
97
98 /* We require only the four bytes of the ICMPv6 header, not any
99 * additional bytes of message body in "struct icmp6hdr".
100 */
101 hdr = skb_header_pointer(skb, skb_transport_offset(skb),
102 ICMPV6_HDRLEN, &_hdr);
103 if (hdr) {
104 const __u32 *data = &raw6_sk(sk)->filter.data[0];
105 unsigned int type = hdr->icmp6_type;
106
107 return (data[type >> 5] & (1U << (type & 31))) != 0;
108 }
109 return 1;
110}
111
112#if IS_ENABLED(CONFIG_IPV6_MIP6)
113typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
114
115static mh_filter_t __rcu *mh_filter __read_mostly;
116
117int rawv6_mh_filter_register(mh_filter_t filter)
118{
119 rcu_assign_pointer(mh_filter, filter);
120 return 0;
121}
122EXPORT_SYMBOL(rawv6_mh_filter_register);
123
124int rawv6_mh_filter_unregister(mh_filter_t filter)
125{
126 RCU_INIT_POINTER(mh_filter, NULL);
127 synchronize_rcu();
128 return 0;
129}
130EXPORT_SYMBOL(rawv6_mh_filter_unregister);
131
132#endif
133
134/*
135 * demultiplex raw sockets.
136 * (should consider queueing the skb in the sock receive_queue
137 * without calling rawv6.c)
138 *
139 * Caller owns SKB so we must make clones.
140 */
141static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
142{
143 struct net *net = dev_net(skb->dev);
144 const struct in6_addr *saddr;
145 const struct in6_addr *daddr;
146 struct hlist_head *hlist;
147 struct sock *sk;
148 bool delivered = false;
149 __u8 hash;
150
151 saddr = &ipv6_hdr(skb)->saddr;
152 daddr = saddr + 1;
153
154 hash = raw_hashfunc(net, nexthdr);
155 hlist = &raw_v6_hashinfo.ht[hash];
156 rcu_read_lock();
157 sk_for_each_rcu(sk, hlist) {
158 int filtered;
159
160 if (!raw_v6_match(net, sk, nexthdr, daddr, saddr,
161 inet6_iif(skb), inet6_sdif(skb)))
162 continue;
163
164 if (atomic_read(&sk->sk_rmem_alloc) >=
165 READ_ONCE(sk->sk_rcvbuf)) {
166 atomic_inc(&sk->sk_drops);
167 continue;
168 }
169
170 delivered = true;
171 switch (nexthdr) {
172 case IPPROTO_ICMPV6:
173 filtered = icmpv6_filter(sk, skb);
174 break;
175
176#if IS_ENABLED(CONFIG_IPV6_MIP6)
177 case IPPROTO_MH:
178 {
179 /* XXX: To validate MH only once for each packet,
180 * this is placed here. It should be after checking
181 * xfrm policy, however it doesn't. The checking xfrm
182 * policy is placed in rawv6_rcv() because it is
183 * required for each socket.
184 */
185 mh_filter_t *filter;
186
187 filter = rcu_dereference(mh_filter);
188 filtered = filter ? (*filter)(sk, skb) : 0;
189 break;
190 }
191#endif
192 default:
193 filtered = 0;
194 break;
195 }
196
197 if (filtered < 0)
198 break;
199 if (filtered == 0) {
200 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
201
202 /* Not releasing hash table! */
203 if (clone)
204 rawv6_rcv(sk, clone);
205 }
206 }
207 rcu_read_unlock();
208 return delivered;
209}
210
211bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
212{
213 return ipv6_raw_deliver(skb, nexthdr);
214}
215
216/* This cleans up af_inet6 a bit. -DaveM */
217static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
218{
219 struct inet_sock *inet = inet_sk(sk);
220 struct ipv6_pinfo *np = inet6_sk(sk);
221 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
222 __be32 v4addr = 0;
223 int addr_type;
224 int err;
225
226 if (addr_len < SIN6_LEN_RFC2133)
227 return -EINVAL;
228
229 if (addr->sin6_family != AF_INET6)
230 return -EINVAL;
231
232 addr_type = ipv6_addr_type(&addr->sin6_addr);
233
234 /* Raw sockets are IPv6 only */
235 if (addr_type == IPV6_ADDR_MAPPED)
236 return -EADDRNOTAVAIL;
237
238 lock_sock(sk);
239
240 err = -EINVAL;
241 if (sk->sk_state != TCP_CLOSE)
242 goto out;
243
244 rcu_read_lock();
245 /* Check if the address belongs to the host. */
246 if (addr_type != IPV6_ADDR_ANY) {
247 struct net_device *dev = NULL;
248
249 if (__ipv6_addr_needs_scope_id(addr_type)) {
250 if (addr_len >= sizeof(struct sockaddr_in6) &&
251 addr->sin6_scope_id) {
252 /* Override any existing binding, if another
253 * one is supplied by user.
254 */
255 sk->sk_bound_dev_if = addr->sin6_scope_id;
256 }
257
258 /* Binding to link-local address requires an interface */
259 if (!sk->sk_bound_dev_if)
260 goto out_unlock;
261 }
262
263 if (sk->sk_bound_dev_if) {
264 err = -ENODEV;
265 dev = dev_get_by_index_rcu(sock_net(sk),
266 sk->sk_bound_dev_if);
267 if (!dev)
268 goto out_unlock;
269 }
270
271 /* ipv4 addr of the socket is invalid. Only the
272 * unspecified and mapped address have a v4 equivalent.
273 */
274 v4addr = LOOPBACK4_IPV6;
275 if (!(addr_type & IPV6_ADDR_MULTICAST) &&
276 !ipv6_can_nonlocal_bind(sock_net(sk), inet)) {
277 err = -EADDRNOTAVAIL;
278 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
279 dev, 0)) {
280 goto out_unlock;
281 }
282 }
283 }
284
285 inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
286 sk->sk_v6_rcv_saddr = addr->sin6_addr;
287 if (!(addr_type & IPV6_ADDR_MULTICAST))
288 np->saddr = addr->sin6_addr;
289 err = 0;
290out_unlock:
291 rcu_read_unlock();
292out:
293 release_sock(sk);
294 return err;
295}
296
297static void rawv6_err(struct sock *sk, struct sk_buff *skb,
298 u8 type, u8 code, int offset, __be32 info)
299{
300 bool recverr = inet6_test_bit(RECVERR6, sk);
301 struct ipv6_pinfo *np = inet6_sk(sk);
302 int err;
303 int harderr;
304
305 /* Report error on raw socket, if:
306 1. User requested recverr.
307 2. Socket is connected (otherwise the error indication
308 is useless without recverr and error is hard.
309 */
310 if (!recverr && sk->sk_state != TCP_ESTABLISHED)
311 return;
312
313 harderr = icmpv6_err_convert(type, code, &err);
314 if (type == ICMPV6_PKT_TOOBIG) {
315 ip6_sk_update_pmtu(skb, sk, info);
316 harderr = (READ_ONCE(np->pmtudisc) == IPV6_PMTUDISC_DO);
317 }
318 if (type == NDISC_REDIRECT) {
319 ip6_sk_redirect(skb, sk);
320 return;
321 }
322 if (recverr) {
323 u8 *payload = skb->data;
324 if (!inet_test_bit(HDRINCL, sk))
325 payload += offset;
326 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
327 }
328
329 if (recverr || harderr) {
330 sk->sk_err = err;
331 sk_error_report(sk);
332 }
333}
334
335void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
336 u8 type, u8 code, int inner_offset, __be32 info)
337{
338 struct net *net = dev_net(skb->dev);
339 struct hlist_head *hlist;
340 struct sock *sk;
341 int hash;
342
343 hash = raw_hashfunc(net, nexthdr);
344 hlist = &raw_v6_hashinfo.ht[hash];
345 rcu_read_lock();
346 sk_for_each_rcu(sk, hlist) {
347 /* Note: ipv6_hdr(skb) != skb->data */
348 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
349
350 if (!raw_v6_match(net, sk, nexthdr, &ip6h->saddr, &ip6h->daddr,
351 inet6_iif(skb), inet6_iif(skb)))
352 continue;
353 rawv6_err(sk, skb, type, code, inner_offset, info);
354 }
355 rcu_read_unlock();
356}
357
358static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
359{
360 enum skb_drop_reason reason;
361
362 if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
363 skb_checksum_complete(skb)) {
364 atomic_inc(&sk->sk_drops);
365 sk_skb_reason_drop(sk, skb, SKB_DROP_REASON_SKB_CSUM);
366 return NET_RX_DROP;
367 }
368
369 /* Charge it to the socket. */
370 skb_dst_drop(skb);
371 if (sock_queue_rcv_skb_reason(sk, skb, &reason) < 0) {
372 sk_skb_reason_drop(sk, skb, reason);
373 return NET_RX_DROP;
374 }
375
376 return 0;
377}
378
379/*
380 * This is next to useless...
381 * if we demultiplex in network layer we don't need the extra call
382 * just to queue the skb...
383 * maybe we could have the network decide upon a hint if it
384 * should call raw_rcv for demultiplexing
385 */
386int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
387{
388 struct inet_sock *inet = inet_sk(sk);
389 struct raw6_sock *rp = raw6_sk(sk);
390
391 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
392 atomic_inc(&sk->sk_drops);
393 sk_skb_reason_drop(sk, skb, SKB_DROP_REASON_XFRM_POLICY);
394 return NET_RX_DROP;
395 }
396 nf_reset_ct(skb);
397
398 if (!rp->checksum)
399 skb->ip_summed = CHECKSUM_UNNECESSARY;
400
401 if (skb->ip_summed == CHECKSUM_COMPLETE) {
402 skb_postpull_rcsum(skb, skb_network_header(skb),
403 skb_network_header_len(skb));
404 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
405 &ipv6_hdr(skb)->daddr,
406 skb->len, inet->inet_num, skb->csum))
407 skb->ip_summed = CHECKSUM_UNNECESSARY;
408 }
409 if (!skb_csum_unnecessary(skb))
410 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
411 &ipv6_hdr(skb)->daddr,
412 skb->len,
413 inet->inet_num, 0));
414
415 if (inet_test_bit(HDRINCL, sk)) {
416 if (skb_checksum_complete(skb)) {
417 atomic_inc(&sk->sk_drops);
418 sk_skb_reason_drop(sk, skb, SKB_DROP_REASON_SKB_CSUM);
419 return NET_RX_DROP;
420 }
421 }
422
423 rawv6_rcv_skb(sk, skb);
424 return 0;
425}
426
427
428/*
429 * This should be easy, if there is something there
430 * we return it, otherwise we block.
431 */
432
433static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
434 int flags, int *addr_len)
435{
436 struct ipv6_pinfo *np = inet6_sk(sk);
437 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
438 struct sk_buff *skb;
439 size_t copied;
440 int err;
441
442 if (flags & MSG_OOB)
443 return -EOPNOTSUPP;
444
445 if (flags & MSG_ERRQUEUE)
446 return ipv6_recv_error(sk, msg, len, addr_len);
447
448 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
449 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
450
451 skb = skb_recv_datagram(sk, flags, &err);
452 if (!skb)
453 goto out;
454
455 copied = skb->len;
456 if (copied > len) {
457 copied = len;
458 msg->msg_flags |= MSG_TRUNC;
459 }
460
461 if (skb_csum_unnecessary(skb)) {
462 err = skb_copy_datagram_msg(skb, 0, msg, copied);
463 } else if (msg->msg_flags&MSG_TRUNC) {
464 if (__skb_checksum_complete(skb))
465 goto csum_copy_err;
466 err = skb_copy_datagram_msg(skb, 0, msg, copied);
467 } else {
468 err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
469 if (err == -EINVAL)
470 goto csum_copy_err;
471 }
472 if (err)
473 goto out_free;
474
475 /* Copy the address. */
476 if (sin6) {
477 sin6->sin6_family = AF_INET6;
478 sin6->sin6_port = 0;
479 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
480 sin6->sin6_flowinfo = 0;
481 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
482 inet6_iif(skb));
483 *addr_len = sizeof(*sin6);
484 }
485
486 sock_recv_cmsgs(msg, sk, skb);
487
488 if (np->rxopt.all)
489 ip6_datagram_recv_ctl(sk, msg, skb);
490
491 err = copied;
492 if (flags & MSG_TRUNC)
493 err = skb->len;
494
495out_free:
496 skb_free_datagram(sk, skb);
497out:
498 return err;
499
500csum_copy_err:
501 skb_kill_datagram(sk, skb, flags);
502
503 /* Error for blocking case is chosen to masquerade
504 as some normal condition.
505 */
506 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
507 goto out;
508}
509
510static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
511 struct raw6_sock *rp)
512{
513 struct ipv6_txoptions *opt;
514 struct sk_buff *skb;
515 int err = 0;
516 int offset;
517 int len;
518 int total_len;
519 __wsum tmp_csum;
520 __sum16 csum;
521
522 if (!rp->checksum)
523 goto send;
524
525 skb = skb_peek(&sk->sk_write_queue);
526 if (!skb)
527 goto out;
528
529 offset = rp->offset;
530 total_len = inet_sk(sk)->cork.base.length;
531 opt = inet6_sk(sk)->cork.opt;
532 total_len -= opt ? opt->opt_flen : 0;
533
534 if (offset >= total_len - 1) {
535 err = -EINVAL;
536 ip6_flush_pending_frames(sk);
537 goto out;
538 }
539
540 /* should be check HW csum miyazawa */
541 if (skb_queue_len(&sk->sk_write_queue) == 1) {
542 /*
543 * Only one fragment on the socket.
544 */
545 tmp_csum = skb->csum;
546 } else {
547 struct sk_buff *csum_skb = NULL;
548 tmp_csum = 0;
549
550 skb_queue_walk(&sk->sk_write_queue, skb) {
551 tmp_csum = csum_add(tmp_csum, skb->csum);
552
553 if (csum_skb)
554 continue;
555
556 len = skb->len - skb_transport_offset(skb);
557 if (offset >= len) {
558 offset -= len;
559 continue;
560 }
561
562 csum_skb = skb;
563 }
564
565 skb = csum_skb;
566 }
567
568 offset += skb_transport_offset(skb);
569 err = skb_copy_bits(skb, offset, &csum, 2);
570 if (err < 0) {
571 ip6_flush_pending_frames(sk);
572 goto out;
573 }
574
575 /* in case cksum was not initialized */
576 if (unlikely(csum))
577 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
578
579 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
580 total_len, fl6->flowi6_proto, tmp_csum);
581
582 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
583 csum = CSUM_MANGLED_0;
584
585 BUG_ON(skb_store_bits(skb, offset, &csum, 2));
586
587send:
588 err = ip6_push_pending_frames(sk);
589out:
590 return err;
591}
592
593static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
594 struct flowi6 *fl6, struct dst_entry **dstp,
595 unsigned int flags, const struct sockcm_cookie *sockc)
596{
597 struct net *net = sock_net(sk);
598 struct ipv6hdr *iph;
599 struct sk_buff *skb;
600 int err;
601 struct rt6_info *rt = dst_rt6_info(*dstp);
602 int hlen = LL_RESERVED_SPACE(rt->dst.dev);
603 int tlen = rt->dst.dev->needed_tailroom;
604
605 if (length > rt->dst.dev->mtu) {
606 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
607 return -EMSGSIZE;
608 }
609 if (length < sizeof(struct ipv6hdr))
610 return -EINVAL;
611 if (flags&MSG_PROBE)
612 goto out;
613
614 skb = sock_alloc_send_skb(sk,
615 length + hlen + tlen + 15,
616 flags & MSG_DONTWAIT, &err);
617 if (!skb)
618 goto error;
619 skb_reserve(skb, hlen);
620
621 skb->protocol = htons(ETH_P_IPV6);
622 skb->priority = READ_ONCE(sk->sk_priority);
623 skb->mark = sockc->mark;
624 skb_set_delivery_type_by_clockid(skb, sockc->transmit_time, sk->sk_clockid);
625
626 skb_put(skb, length);
627 skb_reset_network_header(skb);
628 iph = ipv6_hdr(skb);
629
630 skb->ip_summed = CHECKSUM_NONE;
631
632 skb_setup_tx_timestamp(skb, sockc);
633
634 if (flags & MSG_CONFIRM)
635 skb_set_dst_pending_confirm(skb, 1);
636
637 skb->transport_header = skb->network_header;
638 err = memcpy_from_msg(iph, msg, length);
639 if (err) {
640 err = -EFAULT;
641 kfree_skb(skb);
642 goto error;
643 }
644
645 skb_dst_set(skb, &rt->dst);
646 *dstp = NULL;
647
648 /* if egress device is enslaved to an L3 master device pass the
649 * skb to its handler for processing
650 */
651 skb = l3mdev_ip6_out(sk, skb);
652 if (unlikely(!skb))
653 return 0;
654
655 /* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev
656 * in the error path. Since skb has been freed, the dst could
657 * have been queued for deletion.
658 */
659 rcu_read_lock();
660 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS);
661 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
662 NULL, rt->dst.dev, dst_output);
663 if (err > 0)
664 err = net_xmit_errno(err);
665 if (err) {
666 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
667 rcu_read_unlock();
668 goto error_check;
669 }
670 rcu_read_unlock();
671out:
672 return 0;
673
674error:
675 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
676error_check:
677 if (err == -ENOBUFS && !inet6_test_bit(RECVERR6, sk))
678 err = 0;
679 return err;
680}
681
682struct raw6_frag_vec {
683 struct msghdr *msg;
684 int hlen;
685 char c[4];
686};
687
688static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
689{
690 int err = 0;
691 switch (fl6->flowi6_proto) {
692 case IPPROTO_ICMPV6:
693 rfv->hlen = 2;
694 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
695 if (!err) {
696 fl6->fl6_icmp_type = rfv->c[0];
697 fl6->fl6_icmp_code = rfv->c[1];
698 }
699 break;
700 case IPPROTO_MH:
701 rfv->hlen = 4;
702 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
703 if (!err)
704 fl6->fl6_mh_type = rfv->c[2];
705 }
706 return err;
707}
708
709static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
710 struct sk_buff *skb)
711{
712 struct raw6_frag_vec *rfv = from;
713
714 if (offset < rfv->hlen) {
715 int copy = min(rfv->hlen - offset, len);
716
717 if (skb->ip_summed == CHECKSUM_PARTIAL)
718 memcpy(to, rfv->c + offset, copy);
719 else
720 skb->csum = csum_block_add(
721 skb->csum,
722 csum_partial_copy_nocheck(rfv->c + offset,
723 to, copy),
724 odd);
725
726 odd = 0;
727 offset += copy;
728 to += copy;
729 len -= copy;
730
731 if (!len)
732 return 0;
733 }
734
735 offset -= rfv->hlen;
736
737 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
738}
739
740static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
741{
742 struct ipv6_txoptions *opt_to_free = NULL;
743 struct ipv6_txoptions opt_space;
744 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
745 struct in6_addr *daddr, *final_p, final;
746 struct inet_sock *inet = inet_sk(sk);
747 struct ipv6_pinfo *np = inet6_sk(sk);
748 struct raw6_sock *rp = raw6_sk(sk);
749 struct ipv6_txoptions *opt = NULL;
750 struct ip6_flowlabel *flowlabel = NULL;
751 struct dst_entry *dst = NULL;
752 struct raw6_frag_vec rfv;
753 struct flowi6 fl6;
754 struct ipcm6_cookie ipc6;
755 int addr_len = msg->msg_namelen;
756 int hdrincl;
757 u16 proto;
758 int err;
759
760 /* Rough check on arithmetic overflow,
761 better check is made in ip6_append_data().
762 */
763 if (len > INT_MAX)
764 return -EMSGSIZE;
765
766 /* Mirror BSD error message compatibility */
767 if (msg->msg_flags & MSG_OOB)
768 return -EOPNOTSUPP;
769
770 hdrincl = inet_test_bit(HDRINCL, sk);
771
772 /*
773 * Get and verify the address.
774 */
775 memset(&fl6, 0, sizeof(fl6));
776
777 fl6.flowi6_mark = READ_ONCE(sk->sk_mark);
778 fl6.flowi6_uid = sk->sk_uid;
779
780 ipcm6_init(&ipc6);
781 ipc6.sockc.tsflags = READ_ONCE(sk->sk_tsflags);
782 ipc6.sockc.mark = fl6.flowi6_mark;
783
784 if (sin6) {
785 if (addr_len < SIN6_LEN_RFC2133)
786 return -EINVAL;
787
788 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
789 return -EAFNOSUPPORT;
790
791 /* port is the proto value [0..255] carried in nexthdr */
792 proto = ntohs(sin6->sin6_port);
793
794 if (!proto)
795 proto = inet->inet_num;
796 else if (proto != inet->inet_num &&
797 inet->inet_num != IPPROTO_RAW)
798 return -EINVAL;
799
800 if (proto > 255)
801 return -EINVAL;
802
803 daddr = &sin6->sin6_addr;
804 if (inet6_test_bit(SNDFLOW, sk)) {
805 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
806 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
807 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
808 if (IS_ERR(flowlabel))
809 return -EINVAL;
810 }
811 }
812
813 /*
814 * Otherwise it will be difficult to maintain
815 * sk->sk_dst_cache.
816 */
817 if (sk->sk_state == TCP_ESTABLISHED &&
818 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
819 daddr = &sk->sk_v6_daddr;
820
821 if (addr_len >= sizeof(struct sockaddr_in6) &&
822 sin6->sin6_scope_id &&
823 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
824 fl6.flowi6_oif = sin6->sin6_scope_id;
825 } else {
826 if (sk->sk_state != TCP_ESTABLISHED)
827 return -EDESTADDRREQ;
828
829 proto = inet->inet_num;
830 daddr = &sk->sk_v6_daddr;
831 fl6.flowlabel = np->flow_label;
832 }
833
834 if (fl6.flowi6_oif == 0)
835 fl6.flowi6_oif = sk->sk_bound_dev_if;
836
837 if (msg->msg_controllen) {
838 opt = &opt_space;
839 memset(opt, 0, sizeof(struct ipv6_txoptions));
840 opt->tot_len = sizeof(struct ipv6_txoptions);
841 ipc6.opt = opt;
842
843 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
844 if (err < 0) {
845 fl6_sock_release(flowlabel);
846 return err;
847 }
848 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
849 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
850 if (IS_ERR(flowlabel))
851 return -EINVAL;
852 }
853 if (!(opt->opt_nflen|opt->opt_flen))
854 opt = NULL;
855 }
856 if (!opt) {
857 opt = txopt_get(np);
858 opt_to_free = opt;
859 }
860 if (flowlabel)
861 opt = fl6_merge_options(&opt_space, flowlabel, opt);
862 opt = ipv6_fixup_options(&opt_space, opt);
863
864 fl6.flowi6_proto = proto;
865 fl6.flowi6_mark = ipc6.sockc.mark;
866
867 if (!hdrincl) {
868 rfv.msg = msg;
869 rfv.hlen = 0;
870 err = rawv6_probe_proto_opt(&rfv, &fl6);
871 if (err)
872 goto out;
873 }
874
875 if (!ipv6_addr_any(daddr))
876 fl6.daddr = *daddr;
877 else
878 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
879 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
880 fl6.saddr = np->saddr;
881
882 final_p = fl6_update_dst(&fl6, opt, &final);
883
884 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
885 fl6.flowi6_oif = READ_ONCE(np->mcast_oif);
886 else if (!fl6.flowi6_oif)
887 fl6.flowi6_oif = READ_ONCE(np->ucast_oif);
888 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
889
890 if (hdrincl)
891 fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH;
892
893 if (ipc6.tclass < 0)
894 ipc6.tclass = np->tclass;
895
896 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
897
898 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
899 if (IS_ERR(dst)) {
900 err = PTR_ERR(dst);
901 goto out;
902 }
903 if (ipc6.hlimit < 0)
904 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
905
906 if (ipc6.dontfrag < 0)
907 ipc6.dontfrag = inet6_test_bit(DONTFRAG, sk);
908
909 if (msg->msg_flags&MSG_CONFIRM)
910 goto do_confirm;
911
912back_from_confirm:
913 if (hdrincl)
914 err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst,
915 msg->msg_flags, &ipc6.sockc);
916 else {
917 ipc6.opt = opt;
918 lock_sock(sk);
919 err = ip6_append_data(sk, raw6_getfrag, &rfv,
920 len, 0, &ipc6, &fl6, dst_rt6_info(dst),
921 msg->msg_flags);
922
923 if (err)
924 ip6_flush_pending_frames(sk);
925 else if (!(msg->msg_flags & MSG_MORE))
926 err = rawv6_push_pending_frames(sk, &fl6, rp);
927 release_sock(sk);
928 }
929done:
930 dst_release(dst);
931out:
932 fl6_sock_release(flowlabel);
933 txopt_put(opt_to_free);
934 return err < 0 ? err : len;
935do_confirm:
936 if (msg->msg_flags & MSG_PROBE)
937 dst_confirm_neigh(dst, &fl6.daddr);
938 if (!(msg->msg_flags & MSG_PROBE) || len)
939 goto back_from_confirm;
940 err = 0;
941 goto done;
942}
943
944static int rawv6_seticmpfilter(struct sock *sk, int optname,
945 sockptr_t optval, int optlen)
946{
947 switch (optname) {
948 case ICMPV6_FILTER:
949 if (optlen > sizeof(struct icmp6_filter))
950 optlen = sizeof(struct icmp6_filter);
951 if (copy_from_sockptr(&raw6_sk(sk)->filter, optval, optlen))
952 return -EFAULT;
953 return 0;
954 default:
955 return -ENOPROTOOPT;
956 }
957
958 return 0;
959}
960
961static int rawv6_geticmpfilter(struct sock *sk, int optname,
962 char __user *optval, int __user *optlen)
963{
964 int len;
965
966 switch (optname) {
967 case ICMPV6_FILTER:
968 if (get_user(len, optlen))
969 return -EFAULT;
970 if (len < 0)
971 return -EINVAL;
972 if (len > sizeof(struct icmp6_filter))
973 len = sizeof(struct icmp6_filter);
974 if (put_user(len, optlen))
975 return -EFAULT;
976 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
977 return -EFAULT;
978 return 0;
979 default:
980 return -ENOPROTOOPT;
981 }
982
983 return 0;
984}
985
986
987static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
988 sockptr_t optval, unsigned int optlen)
989{
990 struct raw6_sock *rp = raw6_sk(sk);
991 int val;
992
993 if (optlen < sizeof(val))
994 return -EINVAL;
995
996 if (copy_from_sockptr(&val, optval, sizeof(val)))
997 return -EFAULT;
998
999 switch (optname) {
1000 case IPV6_HDRINCL:
1001 if (sk->sk_type != SOCK_RAW)
1002 return -EINVAL;
1003 inet_assign_bit(HDRINCL, sk, val);
1004 return 0;
1005 case IPV6_CHECKSUM:
1006 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
1007 level == IPPROTO_IPV6) {
1008 /*
1009 * RFC3542 tells that IPV6_CHECKSUM socket
1010 * option in the IPPROTO_IPV6 level is not
1011 * allowed on ICMPv6 sockets.
1012 * If you want to set it, use IPPROTO_RAW
1013 * level IPV6_CHECKSUM socket option
1014 * (Linux extension).
1015 */
1016 return -EINVAL;
1017 }
1018
1019 /* You may get strange result with a positive odd offset;
1020 RFC2292bis agrees with me. */
1021 if (val > 0 && (val&1))
1022 return -EINVAL;
1023 if (val < 0) {
1024 rp->checksum = 0;
1025 } else {
1026 rp->checksum = 1;
1027 rp->offset = val;
1028 }
1029
1030 return 0;
1031
1032 default:
1033 return -ENOPROTOOPT;
1034 }
1035}
1036
1037static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1038 sockptr_t optval, unsigned int optlen)
1039{
1040 switch (level) {
1041 case SOL_RAW:
1042 break;
1043
1044 case SOL_ICMPV6:
1045 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1046 return -EOPNOTSUPP;
1047 return rawv6_seticmpfilter(sk, optname, optval, optlen);
1048 case SOL_IPV6:
1049 if (optname == IPV6_CHECKSUM ||
1050 optname == IPV6_HDRINCL)
1051 break;
1052 fallthrough;
1053 default:
1054 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1055 }
1056
1057 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1058}
1059
1060static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1061 char __user *optval, int __user *optlen)
1062{
1063 struct raw6_sock *rp = raw6_sk(sk);
1064 int val, len;
1065
1066 if (get_user(len, optlen))
1067 return -EFAULT;
1068
1069 switch (optname) {
1070 case IPV6_HDRINCL:
1071 val = inet_test_bit(HDRINCL, sk);
1072 break;
1073 case IPV6_CHECKSUM:
1074 /*
1075 * We allow getsockopt() for IPPROTO_IPV6-level
1076 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1077 * since RFC3542 is silent about it.
1078 */
1079 if (rp->checksum == 0)
1080 val = -1;
1081 else
1082 val = rp->offset;
1083 break;
1084
1085 default:
1086 return -ENOPROTOOPT;
1087 }
1088
1089 len = min_t(unsigned int, sizeof(int), len);
1090
1091 if (put_user(len, optlen))
1092 return -EFAULT;
1093 if (copy_to_user(optval, &val, len))
1094 return -EFAULT;
1095 return 0;
1096}
1097
1098static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1099 char __user *optval, int __user *optlen)
1100{
1101 switch (level) {
1102 case SOL_RAW:
1103 break;
1104
1105 case SOL_ICMPV6:
1106 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1107 return -EOPNOTSUPP;
1108 return rawv6_geticmpfilter(sk, optname, optval, optlen);
1109 case SOL_IPV6:
1110 if (optname == IPV6_CHECKSUM ||
1111 optname == IPV6_HDRINCL)
1112 break;
1113 fallthrough;
1114 default:
1115 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1116 }
1117
1118 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1119}
1120
1121static int rawv6_ioctl(struct sock *sk, int cmd, int *karg)
1122{
1123 switch (cmd) {
1124 case SIOCOUTQ: {
1125 *karg = sk_wmem_alloc_get(sk);
1126 return 0;
1127 }
1128 case SIOCINQ: {
1129 struct sk_buff *skb;
1130
1131 spin_lock_bh(&sk->sk_receive_queue.lock);
1132 skb = skb_peek(&sk->sk_receive_queue);
1133 if (skb)
1134 *karg = skb->len;
1135 else
1136 *karg = 0;
1137 spin_unlock_bh(&sk->sk_receive_queue.lock);
1138 return 0;
1139 }
1140
1141 default:
1142#ifdef CONFIG_IPV6_MROUTE
1143 return ip6mr_ioctl(sk, cmd, karg);
1144#else
1145 return -ENOIOCTLCMD;
1146#endif
1147 }
1148}
1149
1150#ifdef CONFIG_COMPAT
1151static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1152{
1153 switch (cmd) {
1154 case SIOCOUTQ:
1155 case SIOCINQ:
1156 return -ENOIOCTLCMD;
1157 default:
1158#ifdef CONFIG_IPV6_MROUTE
1159 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1160#else
1161 return -ENOIOCTLCMD;
1162#endif
1163 }
1164}
1165#endif
1166
1167static void rawv6_close(struct sock *sk, long timeout)
1168{
1169 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1170 ip6_ra_control(sk, -1);
1171 ip6mr_sk_done(sk);
1172 sk_common_release(sk);
1173}
1174
1175static void raw6_destroy(struct sock *sk)
1176{
1177 lock_sock(sk);
1178 ip6_flush_pending_frames(sk);
1179 release_sock(sk);
1180}
1181
1182static int rawv6_init_sk(struct sock *sk)
1183{
1184 struct raw6_sock *rp = raw6_sk(sk);
1185
1186 switch (inet_sk(sk)->inet_num) {
1187 case IPPROTO_ICMPV6:
1188 rp->checksum = 1;
1189 rp->offset = 2;
1190 break;
1191 case IPPROTO_MH:
1192 rp->checksum = 1;
1193 rp->offset = 4;
1194 break;
1195 default:
1196 break;
1197 }
1198 return 0;
1199}
1200
1201struct proto rawv6_prot = {
1202 .name = "RAWv6",
1203 .owner = THIS_MODULE,
1204 .close = rawv6_close,
1205 .destroy = raw6_destroy,
1206 .connect = ip6_datagram_connect_v6_only,
1207 .disconnect = __udp_disconnect,
1208 .ioctl = rawv6_ioctl,
1209 .init = rawv6_init_sk,
1210 .setsockopt = rawv6_setsockopt,
1211 .getsockopt = rawv6_getsockopt,
1212 .sendmsg = rawv6_sendmsg,
1213 .recvmsg = rawv6_recvmsg,
1214 .bind = rawv6_bind,
1215 .backlog_rcv = rawv6_rcv_skb,
1216 .hash = raw_hash_sk,
1217 .unhash = raw_unhash_sk,
1218 .obj_size = sizeof(struct raw6_sock),
1219 .ipv6_pinfo_offset = offsetof(struct raw6_sock, inet6),
1220 .useroffset = offsetof(struct raw6_sock, filter),
1221 .usersize = sizeof_field(struct raw6_sock, filter),
1222 .h.raw_hash = &raw_v6_hashinfo,
1223#ifdef CONFIG_COMPAT
1224 .compat_ioctl = compat_rawv6_ioctl,
1225#endif
1226 .diag_destroy = raw_abort,
1227};
1228
1229#ifdef CONFIG_PROC_FS
1230static int raw6_seq_show(struct seq_file *seq, void *v)
1231{
1232 if (v == SEQ_START_TOKEN) {
1233 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1234 } else {
1235 struct sock *sp = v;
1236 __u16 srcp = inet_sk(sp)->inet_num;
1237 ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1238 raw_seq_private(seq)->bucket);
1239 }
1240 return 0;
1241}
1242
1243static const struct seq_operations raw6_seq_ops = {
1244 .start = raw_seq_start,
1245 .next = raw_seq_next,
1246 .stop = raw_seq_stop,
1247 .show = raw6_seq_show,
1248};
1249
1250static int __net_init raw6_init_net(struct net *net)
1251{
1252 if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops,
1253 sizeof(struct raw_iter_state), &raw_v6_hashinfo))
1254 return -ENOMEM;
1255
1256 return 0;
1257}
1258
1259static void __net_exit raw6_exit_net(struct net *net)
1260{
1261 remove_proc_entry("raw6", net->proc_net);
1262}
1263
1264static struct pernet_operations raw6_net_ops = {
1265 .init = raw6_init_net,
1266 .exit = raw6_exit_net,
1267};
1268
1269int __init raw6_proc_init(void)
1270{
1271 return register_pernet_subsys(&raw6_net_ops);
1272}
1273
1274void raw6_proc_exit(void)
1275{
1276 unregister_pernet_subsys(&raw6_net_ops);
1277}
1278#endif /* CONFIG_PROC_FS */
1279
1280/* Same as inet6_dgram_ops, sans udp_poll. */
1281const struct proto_ops inet6_sockraw_ops = {
1282 .family = PF_INET6,
1283 .owner = THIS_MODULE,
1284 .release = inet6_release,
1285 .bind = inet6_bind,
1286 .connect = inet_dgram_connect, /* ok */
1287 .socketpair = sock_no_socketpair, /* a do nothing */
1288 .accept = sock_no_accept, /* a do nothing */
1289 .getname = inet6_getname,
1290 .poll = datagram_poll, /* ok */
1291 .ioctl = inet6_ioctl, /* must change */
1292 .gettstamp = sock_gettstamp,
1293 .listen = sock_no_listen, /* ok */
1294 .shutdown = inet_shutdown, /* ok */
1295 .setsockopt = sock_common_setsockopt, /* ok */
1296 .getsockopt = sock_common_getsockopt, /* ok */
1297 .sendmsg = inet_sendmsg, /* ok */
1298 .recvmsg = sock_common_recvmsg, /* ok */
1299 .mmap = sock_no_mmap,
1300#ifdef CONFIG_COMPAT
1301 .compat_ioctl = inet6_compat_ioctl,
1302#endif
1303};
1304
1305static struct inet_protosw rawv6_protosw = {
1306 .type = SOCK_RAW,
1307 .protocol = IPPROTO_IP, /* wild card */
1308 .prot = &rawv6_prot,
1309 .ops = &inet6_sockraw_ops,
1310 .flags = INET_PROTOSW_REUSE,
1311};
1312
1313int __init rawv6_init(void)
1314{
1315 return inet6_register_protosw(&rawv6_protosw);
1316}
1317
1318void rawv6_exit(void)
1319{
1320 inet6_unregister_protosw(&rawv6_protosw);
1321}