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ath10k: remove htt rx amsdu clear retry bit hack
[deliverable/linux.git] / net / ipv6 / raw.c
1 /*
2 * RAW sockets for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Adapted from linux/net/ipv4/raw.c
9 *
10 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance)
13 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
19 */
20
21 #include <linux/errno.h>
22 #include <linux/types.h>
23 #include <linux/socket.h>
24 #include <linux/slab.h>
25 #include <linux/sockios.h>
26 #include <linux/net.h>
27 #include <linux/in6.h>
28 #include <linux/netdevice.h>
29 #include <linux/if_arp.h>
30 #include <linux/icmpv6.h>
31 #include <linux/netfilter.h>
32 #include <linux/netfilter_ipv6.h>
33 #include <linux/skbuff.h>
34 #include <linux/compat.h>
35 #include <asm/uaccess.h>
36 #include <asm/ioctls.h>
37
38 #include <net/net_namespace.h>
39 #include <net/ip.h>
40 #include <net/sock.h>
41 #include <net/snmp.h>
42
43 #include <net/ipv6.h>
44 #include <net/ndisc.h>
45 #include <net/protocol.h>
46 #include <net/ip6_route.h>
47 #include <net/ip6_checksum.h>
48 #include <net/addrconf.h>
49 #include <net/transp_v6.h>
50 #include <net/udp.h>
51 #include <net/inet_common.h>
52 #include <net/tcp_states.h>
53 #if IS_ENABLED(CONFIG_IPV6_MIP6)
54 #include <net/mip6.h>
55 #endif
56 #include <linux/mroute6.h>
57
58 #include <net/raw.h>
59 #include <net/rawv6.h>
60 #include <net/xfrm.h>
61
62 #include <linux/proc_fs.h>
63 #include <linux/seq_file.h>
64 #include <linux/export.h>
65
66 #define ICMPV6_HDRLEN 4 /* ICMPv6 header, RFC 4443 Section 2.1 */
67
68 static struct raw_hashinfo raw_v6_hashinfo = {
69 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
70 };
71
72 static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
73 unsigned short num, const struct in6_addr *loc_addr,
74 const struct in6_addr *rmt_addr, int dif)
75 {
76 bool is_multicast = ipv6_addr_is_multicast(loc_addr);
77
78 sk_for_each_from(sk)
79 if (inet_sk(sk)->inet_num == num) {
80 struct ipv6_pinfo *np = inet6_sk(sk);
81
82 if (!net_eq(sock_net(sk), net))
83 continue;
84
85 if (!ipv6_addr_any(&np->daddr) &&
86 !ipv6_addr_equal(&np->daddr, rmt_addr))
87 continue;
88
89 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
90 continue;
91
92 if (!ipv6_addr_any(&np->rcv_saddr)) {
93 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
94 goto found;
95 if (is_multicast &&
96 inet6_mc_check(sk, loc_addr, rmt_addr))
97 goto found;
98 continue;
99 }
100 goto found;
101 }
102 sk = NULL;
103 found:
104 return sk;
105 }
106
107 /*
108 * 0 - deliver
109 * 1 - block
110 */
111 static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
112 {
113 struct icmp6hdr _hdr;
114 const struct icmp6hdr *hdr;
115
116 /* We require only the four bytes of the ICMPv6 header, not any
117 * additional bytes of message body in "struct icmp6hdr".
118 */
119 hdr = skb_header_pointer(skb, skb_transport_offset(skb),
120 ICMPV6_HDRLEN, &_hdr);
121 if (hdr) {
122 const __u32 *data = &raw6_sk(sk)->filter.data[0];
123 unsigned int type = hdr->icmp6_type;
124
125 return (data[type >> 5] & (1U << (type & 31))) != 0;
126 }
127 return 1;
128 }
129
130 #if IS_ENABLED(CONFIG_IPV6_MIP6)
131 typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
132
133 static mh_filter_t __rcu *mh_filter __read_mostly;
134
135 int rawv6_mh_filter_register(mh_filter_t filter)
136 {
137 rcu_assign_pointer(mh_filter, filter);
138 return 0;
139 }
140 EXPORT_SYMBOL(rawv6_mh_filter_register);
141
142 int rawv6_mh_filter_unregister(mh_filter_t filter)
143 {
144 RCU_INIT_POINTER(mh_filter, NULL);
145 synchronize_rcu();
146 return 0;
147 }
148 EXPORT_SYMBOL(rawv6_mh_filter_unregister);
149
150 #endif
151
152 /*
153 * demultiplex raw sockets.
154 * (should consider queueing the skb in the sock receive_queue
155 * without calling rawv6.c)
156 *
157 * Caller owns SKB so we must make clones.
158 */
159 static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
160 {
161 const struct in6_addr *saddr;
162 const struct in6_addr *daddr;
163 struct sock *sk;
164 bool delivered = false;
165 __u8 hash;
166 struct net *net;
167
168 saddr = &ipv6_hdr(skb)->saddr;
169 daddr = saddr + 1;
170
171 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
172
173 read_lock(&raw_v6_hashinfo.lock);
174 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
175
176 if (sk == NULL)
177 goto out;
178
179 net = dev_net(skb->dev);
180 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
181
182 while (sk) {
183 int filtered;
184
185 delivered = true;
186 switch (nexthdr) {
187 case IPPROTO_ICMPV6:
188 filtered = icmpv6_filter(sk, skb);
189 break;
190
191 #if IS_ENABLED(CONFIG_IPV6_MIP6)
192 case IPPROTO_MH:
193 {
194 /* XXX: To validate MH only once for each packet,
195 * this is placed here. It should be after checking
196 * xfrm policy, however it doesn't. The checking xfrm
197 * policy is placed in rawv6_rcv() because it is
198 * required for each socket.
199 */
200 mh_filter_t *filter;
201
202 filter = rcu_dereference(mh_filter);
203 filtered = filter ? (*filter)(sk, skb) : 0;
204 break;
205 }
206 #endif
207 default:
208 filtered = 0;
209 break;
210 }
211
212 if (filtered < 0)
213 break;
214 if (filtered == 0) {
215 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
216
217 /* Not releasing hash table! */
218 if (clone) {
219 nf_reset(clone);
220 rawv6_rcv(sk, clone);
221 }
222 }
223 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
224 IP6CB(skb)->iif);
225 }
226 out:
227 read_unlock(&raw_v6_hashinfo.lock);
228 return delivered;
229 }
230
231 bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
232 {
233 struct sock *raw_sk;
234
235 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]);
236 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
237 raw_sk = NULL;
238
239 return raw_sk != NULL;
240 }
241
242 /* This cleans up af_inet6 a bit. -DaveM */
243 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
244 {
245 struct inet_sock *inet = inet_sk(sk);
246 struct ipv6_pinfo *np = inet6_sk(sk);
247 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
248 __be32 v4addr = 0;
249 int addr_type;
250 int err;
251
252 if (addr_len < SIN6_LEN_RFC2133)
253 return -EINVAL;
254 addr_type = ipv6_addr_type(&addr->sin6_addr);
255
256 /* Raw sockets are IPv6 only */
257 if (addr_type == IPV6_ADDR_MAPPED)
258 return -EADDRNOTAVAIL;
259
260 lock_sock(sk);
261
262 err = -EINVAL;
263 if (sk->sk_state != TCP_CLOSE)
264 goto out;
265
266 rcu_read_lock();
267 /* Check if the address belongs to the host. */
268 if (addr_type != IPV6_ADDR_ANY) {
269 struct net_device *dev = NULL;
270
271 if (__ipv6_addr_needs_scope_id(addr_type)) {
272 if (addr_len >= sizeof(struct sockaddr_in6) &&
273 addr->sin6_scope_id) {
274 /* Override any existing binding, if another
275 * one is supplied by user.
276 */
277 sk->sk_bound_dev_if = addr->sin6_scope_id;
278 }
279
280 /* Binding to link-local address requires an interface */
281 if (!sk->sk_bound_dev_if)
282 goto out_unlock;
283
284 err = -ENODEV;
285 dev = dev_get_by_index_rcu(sock_net(sk),
286 sk->sk_bound_dev_if);
287 if (!dev)
288 goto out_unlock;
289 }
290
291 /* ipv4 addr of the socket is invalid. Only the
292 * unspecified and mapped address have a v4 equivalent.
293 */
294 v4addr = LOOPBACK4_IPV6;
295 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
296 err = -EADDRNOTAVAIL;
297 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
298 dev, 0)) {
299 goto out_unlock;
300 }
301 }
302 }
303
304 inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
305 np->rcv_saddr = addr->sin6_addr;
306 if (!(addr_type & IPV6_ADDR_MULTICAST))
307 np->saddr = addr->sin6_addr;
308 err = 0;
309 out_unlock:
310 rcu_read_unlock();
311 out:
312 release_sock(sk);
313 return err;
314 }
315
316 static void rawv6_err(struct sock *sk, struct sk_buff *skb,
317 struct inet6_skb_parm *opt,
318 u8 type, u8 code, int offset, __be32 info)
319 {
320 struct inet_sock *inet = inet_sk(sk);
321 struct ipv6_pinfo *np = inet6_sk(sk);
322 int err;
323 int harderr;
324
325 /* Report error on raw socket, if:
326 1. User requested recverr.
327 2. Socket is connected (otherwise the error indication
328 is useless without recverr and error is hard.
329 */
330 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
331 return;
332
333 harderr = icmpv6_err_convert(type, code, &err);
334 if (type == ICMPV6_PKT_TOOBIG) {
335 ip6_sk_update_pmtu(skb, sk, info);
336 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
337 }
338 if (type == NDISC_REDIRECT)
339 ip6_sk_redirect(skb, sk);
340 if (np->recverr) {
341 u8 *payload = skb->data;
342 if (!inet->hdrincl)
343 payload += offset;
344 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
345 }
346
347 if (np->recverr || harderr) {
348 sk->sk_err = err;
349 sk->sk_error_report(sk);
350 }
351 }
352
353 void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
354 u8 type, u8 code, int inner_offset, __be32 info)
355 {
356 struct sock *sk;
357 int hash;
358 const struct in6_addr *saddr, *daddr;
359 struct net *net;
360
361 hash = nexthdr & (RAW_HTABLE_SIZE - 1);
362
363 read_lock(&raw_v6_hashinfo.lock);
364 sk = sk_head(&raw_v6_hashinfo.ht[hash]);
365 if (sk != NULL) {
366 /* Note: ipv6_hdr(skb) != skb->data */
367 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
368 saddr = &ip6h->saddr;
369 daddr = &ip6h->daddr;
370 net = dev_net(skb->dev);
371
372 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
373 IP6CB(skb)->iif))) {
374 rawv6_err(sk, skb, NULL, type, code,
375 inner_offset, info);
376 sk = sk_next(sk);
377 }
378 }
379 read_unlock(&raw_v6_hashinfo.lock);
380 }
381
382 static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
383 {
384 if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
385 skb_checksum_complete(skb)) {
386 atomic_inc(&sk->sk_drops);
387 kfree_skb(skb);
388 return NET_RX_DROP;
389 }
390
391 /* Charge it to the socket. */
392 skb_dst_drop(skb);
393 if (sock_queue_rcv_skb(sk, skb) < 0) {
394 kfree_skb(skb);
395 return NET_RX_DROP;
396 }
397
398 return 0;
399 }
400
401 /*
402 * This is next to useless...
403 * if we demultiplex in network layer we don't need the extra call
404 * just to queue the skb...
405 * maybe we could have the network decide upon a hint if it
406 * should call raw_rcv for demultiplexing
407 */
408 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
409 {
410 struct inet_sock *inet = inet_sk(sk);
411 struct raw6_sock *rp = raw6_sk(sk);
412
413 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
414 atomic_inc(&sk->sk_drops);
415 kfree_skb(skb);
416 return NET_RX_DROP;
417 }
418
419 if (!rp->checksum)
420 skb->ip_summed = CHECKSUM_UNNECESSARY;
421
422 if (skb->ip_summed == CHECKSUM_COMPLETE) {
423 skb_postpull_rcsum(skb, skb_network_header(skb),
424 skb_network_header_len(skb));
425 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
426 &ipv6_hdr(skb)->daddr,
427 skb->len, inet->inet_num, skb->csum))
428 skb->ip_summed = CHECKSUM_UNNECESSARY;
429 }
430 if (!skb_csum_unnecessary(skb))
431 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
432 &ipv6_hdr(skb)->daddr,
433 skb->len,
434 inet->inet_num, 0));
435
436 if (inet->hdrincl) {
437 if (skb_checksum_complete(skb)) {
438 atomic_inc(&sk->sk_drops);
439 kfree_skb(skb);
440 return NET_RX_DROP;
441 }
442 }
443
444 rawv6_rcv_skb(sk, skb);
445 return 0;
446 }
447
448
449 /*
450 * This should be easy, if there is something there
451 * we return it, otherwise we block.
452 */
453
454 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
455 struct msghdr *msg, size_t len,
456 int noblock, int flags, int *addr_len)
457 {
458 struct ipv6_pinfo *np = inet6_sk(sk);
459 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
460 struct sk_buff *skb;
461 size_t copied;
462 int err;
463
464 if (flags & MSG_OOB)
465 return -EOPNOTSUPP;
466
467 if (addr_len)
468 *addr_len=sizeof(*sin6);
469
470 if (flags & MSG_ERRQUEUE)
471 return ipv6_recv_error(sk, msg, len);
472
473 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
474 return ipv6_recv_rxpmtu(sk, msg, len);
475
476 skb = skb_recv_datagram(sk, flags, noblock, &err);
477 if (!skb)
478 goto out;
479
480 copied = skb->len;
481 if (copied > len) {
482 copied = len;
483 msg->msg_flags |= MSG_TRUNC;
484 }
485
486 if (skb_csum_unnecessary(skb)) {
487 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
488 } else if (msg->msg_flags&MSG_TRUNC) {
489 if (__skb_checksum_complete(skb))
490 goto csum_copy_err;
491 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
492 } else {
493 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
494 if (err == -EINVAL)
495 goto csum_copy_err;
496 }
497 if (err)
498 goto out_free;
499
500 /* Copy the address. */
501 if (sin6) {
502 sin6->sin6_family = AF_INET6;
503 sin6->sin6_port = 0;
504 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
505 sin6->sin6_flowinfo = 0;
506 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
507 IP6CB(skb)->iif);
508 }
509
510 sock_recv_ts_and_drops(msg, sk, skb);
511
512 if (np->rxopt.all)
513 ip6_datagram_recv_ctl(sk, msg, skb);
514
515 err = copied;
516 if (flags & MSG_TRUNC)
517 err = skb->len;
518
519 out_free:
520 skb_free_datagram(sk, skb);
521 out:
522 return err;
523
524 csum_copy_err:
525 skb_kill_datagram(sk, skb, flags);
526
527 /* Error for blocking case is chosen to masquerade
528 as some normal condition.
529 */
530 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
531 goto out;
532 }
533
534 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
535 struct raw6_sock *rp)
536 {
537 struct sk_buff *skb;
538 int err = 0;
539 int offset;
540 int len;
541 int total_len;
542 __wsum tmp_csum;
543 __sum16 csum;
544
545 if (!rp->checksum)
546 goto send;
547
548 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
549 goto out;
550
551 offset = rp->offset;
552 total_len = inet_sk(sk)->cork.base.length;
553 if (offset >= total_len - 1) {
554 err = -EINVAL;
555 ip6_flush_pending_frames(sk);
556 goto out;
557 }
558
559 /* should be check HW csum miyazawa */
560 if (skb_queue_len(&sk->sk_write_queue) == 1) {
561 /*
562 * Only one fragment on the socket.
563 */
564 tmp_csum = skb->csum;
565 } else {
566 struct sk_buff *csum_skb = NULL;
567 tmp_csum = 0;
568
569 skb_queue_walk(&sk->sk_write_queue, skb) {
570 tmp_csum = csum_add(tmp_csum, skb->csum);
571
572 if (csum_skb)
573 continue;
574
575 len = skb->len - skb_transport_offset(skb);
576 if (offset >= len) {
577 offset -= len;
578 continue;
579 }
580
581 csum_skb = skb;
582 }
583
584 skb = csum_skb;
585 }
586
587 offset += skb_transport_offset(skb);
588 if (skb_copy_bits(skb, offset, &csum, 2))
589 BUG();
590
591 /* in case cksum was not initialized */
592 if (unlikely(csum))
593 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
594
595 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
596 total_len, fl6->flowi6_proto, tmp_csum);
597
598 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
599 csum = CSUM_MANGLED_0;
600
601 if (skb_store_bits(skb, offset, &csum, 2))
602 BUG();
603
604 send:
605 err = ip6_push_pending_frames(sk);
606 out:
607 return err;
608 }
609
610 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
611 struct flowi6 *fl6, struct dst_entry **dstp,
612 unsigned int flags)
613 {
614 struct ipv6_pinfo *np = inet6_sk(sk);
615 struct ipv6hdr *iph;
616 struct sk_buff *skb;
617 int err;
618 struct rt6_info *rt = (struct rt6_info *)*dstp;
619 int hlen = LL_RESERVED_SPACE(rt->dst.dev);
620 int tlen = rt->dst.dev->needed_tailroom;
621
622 if (length > rt->dst.dev->mtu) {
623 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
624 return -EMSGSIZE;
625 }
626 if (flags&MSG_PROBE)
627 goto out;
628
629 skb = sock_alloc_send_skb(sk,
630 length + hlen + tlen + 15,
631 flags & MSG_DONTWAIT, &err);
632 if (skb == NULL)
633 goto error;
634 skb_reserve(skb, hlen);
635
636 skb->protocol = htons(ETH_P_IPV6);
637 skb->priority = sk->sk_priority;
638 skb->mark = sk->sk_mark;
639 skb_dst_set(skb, &rt->dst);
640 *dstp = NULL;
641
642 skb_put(skb, length);
643 skb_reset_network_header(skb);
644 iph = ipv6_hdr(skb);
645
646 skb->ip_summed = CHECKSUM_NONE;
647
648 skb->transport_header = skb->network_header;
649 err = memcpy_fromiovecend((void *)iph, from, 0, length);
650 if (err)
651 goto error_fault;
652
653 IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
654 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
655 rt->dst.dev, dst_output);
656 if (err > 0)
657 err = net_xmit_errno(err);
658 if (err)
659 goto error;
660 out:
661 return 0;
662
663 error_fault:
664 err = -EFAULT;
665 kfree_skb(skb);
666 error:
667 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
668 if (err == -ENOBUFS && !np->recverr)
669 err = 0;
670 return err;
671 }
672
673 static int rawv6_probe_proto_opt(struct flowi6 *fl6, struct msghdr *msg)
674 {
675 struct iovec *iov;
676 u8 __user *type = NULL;
677 u8 __user *code = NULL;
678 u8 len = 0;
679 int probed = 0;
680 int i;
681
682 if (!msg->msg_iov)
683 return 0;
684
685 for (i = 0; i < msg->msg_iovlen; i++) {
686 iov = &msg->msg_iov[i];
687 if (!iov)
688 continue;
689
690 switch (fl6->flowi6_proto) {
691 case IPPROTO_ICMPV6:
692 /* check if one-byte field is readable or not. */
693 if (iov->iov_base && iov->iov_len < 1)
694 break;
695
696 if (!type) {
697 type = iov->iov_base;
698 /* check if code field is readable or not. */
699 if (iov->iov_len > 1)
700 code = type + 1;
701 } else if (!code)
702 code = iov->iov_base;
703
704 if (type && code) {
705 if (get_user(fl6->fl6_icmp_type, type) ||
706 get_user(fl6->fl6_icmp_code, code))
707 return -EFAULT;
708 probed = 1;
709 }
710 break;
711 case IPPROTO_MH:
712 if (iov->iov_base && iov->iov_len < 1)
713 break;
714 /* check if type field is readable or not. */
715 if (iov->iov_len > 2 - len) {
716 u8 __user *p = iov->iov_base;
717 if (get_user(fl6->fl6_mh_type, &p[2 - len]))
718 return -EFAULT;
719 probed = 1;
720 } else
721 len += iov->iov_len;
722
723 break;
724 default:
725 probed = 1;
726 break;
727 }
728 if (probed)
729 break;
730 }
731 return 0;
732 }
733
734 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
735 struct msghdr *msg, size_t len)
736 {
737 struct ipv6_txoptions opt_space;
738 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name;
739 struct in6_addr *daddr, *final_p, final;
740 struct inet_sock *inet = inet_sk(sk);
741 struct ipv6_pinfo *np = inet6_sk(sk);
742 struct raw6_sock *rp = raw6_sk(sk);
743 struct ipv6_txoptions *opt = NULL;
744 struct ip6_flowlabel *flowlabel = NULL;
745 struct dst_entry *dst = NULL;
746 struct flowi6 fl6;
747 int addr_len = msg->msg_namelen;
748 int hlimit = -1;
749 int tclass = -1;
750 int dontfrag = -1;
751 u16 proto;
752 int err;
753
754 /* Rough check on arithmetic overflow,
755 better check is made in ip6_append_data().
756 */
757 if (len > INT_MAX)
758 return -EMSGSIZE;
759
760 /* Mirror BSD error message compatibility */
761 if (msg->msg_flags & MSG_OOB)
762 return -EOPNOTSUPP;
763
764 /*
765 * Get and verify the address.
766 */
767 memset(&fl6, 0, sizeof(fl6));
768
769 fl6.flowi6_mark = sk->sk_mark;
770
771 if (sin6) {
772 if (addr_len < SIN6_LEN_RFC2133)
773 return -EINVAL;
774
775 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
776 return -EAFNOSUPPORT;
777
778 /* port is the proto value [0..255] carried in nexthdr */
779 proto = ntohs(sin6->sin6_port);
780
781 if (!proto)
782 proto = inet->inet_num;
783 else if (proto != inet->inet_num)
784 return -EINVAL;
785
786 if (proto > 255)
787 return -EINVAL;
788
789 daddr = &sin6->sin6_addr;
790 if (np->sndflow) {
791 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
792 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
793 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
794 if (flowlabel == NULL)
795 return -EINVAL;
796 daddr = &flowlabel->dst;
797 }
798 }
799
800 /*
801 * Otherwise it will be difficult to maintain
802 * sk->sk_dst_cache.
803 */
804 if (sk->sk_state == TCP_ESTABLISHED &&
805 ipv6_addr_equal(daddr, &np->daddr))
806 daddr = &np->daddr;
807
808 if (addr_len >= sizeof(struct sockaddr_in6) &&
809 sin6->sin6_scope_id &&
810 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
811 fl6.flowi6_oif = sin6->sin6_scope_id;
812 } else {
813 if (sk->sk_state != TCP_ESTABLISHED)
814 return -EDESTADDRREQ;
815
816 proto = inet->inet_num;
817 daddr = &np->daddr;
818 fl6.flowlabel = np->flow_label;
819 }
820
821 if (fl6.flowi6_oif == 0)
822 fl6.flowi6_oif = sk->sk_bound_dev_if;
823
824 if (msg->msg_controllen) {
825 opt = &opt_space;
826 memset(opt, 0, sizeof(struct ipv6_txoptions));
827 opt->tot_len = sizeof(struct ipv6_txoptions);
828
829 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
830 &hlimit, &tclass, &dontfrag);
831 if (err < 0) {
832 fl6_sock_release(flowlabel);
833 return err;
834 }
835 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
836 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
837 if (flowlabel == NULL)
838 return -EINVAL;
839 }
840 if (!(opt->opt_nflen|opt->opt_flen))
841 opt = NULL;
842 }
843 if (opt == NULL)
844 opt = np->opt;
845 if (flowlabel)
846 opt = fl6_merge_options(&opt_space, flowlabel, opt);
847 opt = ipv6_fixup_options(&opt_space, opt);
848
849 fl6.flowi6_proto = proto;
850 err = rawv6_probe_proto_opt(&fl6, msg);
851 if (err)
852 goto out;
853
854 if (!ipv6_addr_any(daddr))
855 fl6.daddr = *daddr;
856 else
857 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
858 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
859 fl6.saddr = np->saddr;
860
861 final_p = fl6_update_dst(&fl6, opt, &final);
862
863 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
864 fl6.flowi6_oif = np->mcast_oif;
865 else if (!fl6.flowi6_oif)
866 fl6.flowi6_oif = np->ucast_oif;
867 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
868
869 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
870 if (IS_ERR(dst)) {
871 err = PTR_ERR(dst);
872 goto out;
873 }
874 if (hlimit < 0) {
875 if (ipv6_addr_is_multicast(&fl6.daddr))
876 hlimit = np->mcast_hops;
877 else
878 hlimit = np->hop_limit;
879 if (hlimit < 0)
880 hlimit = ip6_dst_hoplimit(dst);
881 }
882
883 if (tclass < 0)
884 tclass = np->tclass;
885
886 if (dontfrag < 0)
887 dontfrag = np->dontfrag;
888
889 if (msg->msg_flags&MSG_CONFIRM)
890 goto do_confirm;
891
892 back_from_confirm:
893 if (inet->hdrincl)
894 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl6, &dst, msg->msg_flags);
895 else {
896 lock_sock(sk);
897 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
898 len, 0, hlimit, tclass, opt, &fl6, (struct rt6_info*)dst,
899 msg->msg_flags, dontfrag);
900
901 if (err)
902 ip6_flush_pending_frames(sk);
903 else if (!(msg->msg_flags & MSG_MORE))
904 err = rawv6_push_pending_frames(sk, &fl6, rp);
905 release_sock(sk);
906 }
907 done:
908 dst_release(dst);
909 out:
910 fl6_sock_release(flowlabel);
911 return err<0?err:len;
912 do_confirm:
913 dst_confirm(dst);
914 if (!(msg->msg_flags & MSG_PROBE) || len)
915 goto back_from_confirm;
916 err = 0;
917 goto done;
918 }
919
920 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
921 char __user *optval, int optlen)
922 {
923 switch (optname) {
924 case ICMPV6_FILTER:
925 if (optlen > sizeof(struct icmp6_filter))
926 optlen = sizeof(struct icmp6_filter);
927 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
928 return -EFAULT;
929 return 0;
930 default:
931 return -ENOPROTOOPT;
932 }
933
934 return 0;
935 }
936
937 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
938 char __user *optval, int __user *optlen)
939 {
940 int len;
941
942 switch (optname) {
943 case ICMPV6_FILTER:
944 if (get_user(len, optlen))
945 return -EFAULT;
946 if (len < 0)
947 return -EINVAL;
948 if (len > sizeof(struct icmp6_filter))
949 len = sizeof(struct icmp6_filter);
950 if (put_user(len, optlen))
951 return -EFAULT;
952 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
953 return -EFAULT;
954 return 0;
955 default:
956 return -ENOPROTOOPT;
957 }
958
959 return 0;
960 }
961
962
963 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
964 char __user *optval, unsigned int optlen)
965 {
966 struct raw6_sock *rp = raw6_sk(sk);
967 int val;
968
969 if (get_user(val, (int __user *)optval))
970 return -EFAULT;
971
972 switch (optname) {
973 case IPV6_CHECKSUM:
974 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
975 level == IPPROTO_IPV6) {
976 /*
977 * RFC3542 tells that IPV6_CHECKSUM socket
978 * option in the IPPROTO_IPV6 level is not
979 * allowed on ICMPv6 sockets.
980 * If you want to set it, use IPPROTO_RAW
981 * level IPV6_CHECKSUM socket option
982 * (Linux extension).
983 */
984 return -EINVAL;
985 }
986
987 /* You may get strange result with a positive odd offset;
988 RFC2292bis agrees with me. */
989 if (val > 0 && (val&1))
990 return -EINVAL;
991 if (val < 0) {
992 rp->checksum = 0;
993 } else {
994 rp->checksum = 1;
995 rp->offset = val;
996 }
997
998 return 0;
999
1000 default:
1001 return -ENOPROTOOPT;
1002 }
1003 }
1004
1005 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1006 char __user *optval, unsigned int optlen)
1007 {
1008 switch (level) {
1009 case SOL_RAW:
1010 break;
1011
1012 case SOL_ICMPV6:
1013 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1014 return -EOPNOTSUPP;
1015 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1016 case SOL_IPV6:
1017 if (optname == IPV6_CHECKSUM)
1018 break;
1019 default:
1020 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1021 }
1022
1023 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1024 }
1025
1026 #ifdef CONFIG_COMPAT
1027 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
1028 char __user *optval, unsigned int optlen)
1029 {
1030 switch (level) {
1031 case SOL_RAW:
1032 break;
1033 case SOL_ICMPV6:
1034 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1035 return -EOPNOTSUPP;
1036 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1037 case SOL_IPV6:
1038 if (optname == IPV6_CHECKSUM)
1039 break;
1040 default:
1041 return compat_ipv6_setsockopt(sk, level, optname,
1042 optval, optlen);
1043 }
1044 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1045 }
1046 #endif
1047
1048 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1049 char __user *optval, int __user *optlen)
1050 {
1051 struct raw6_sock *rp = raw6_sk(sk);
1052 int val, len;
1053
1054 if (get_user(len,optlen))
1055 return -EFAULT;
1056
1057 switch (optname) {
1058 case IPV6_CHECKSUM:
1059 /*
1060 * We allow getsockopt() for IPPROTO_IPV6-level
1061 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1062 * since RFC3542 is silent about it.
1063 */
1064 if (rp->checksum == 0)
1065 val = -1;
1066 else
1067 val = rp->offset;
1068 break;
1069
1070 default:
1071 return -ENOPROTOOPT;
1072 }
1073
1074 len = min_t(unsigned int, sizeof(int), len);
1075
1076 if (put_user(len, optlen))
1077 return -EFAULT;
1078 if (copy_to_user(optval,&val,len))
1079 return -EFAULT;
1080 return 0;
1081 }
1082
1083 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1084 char __user *optval, int __user *optlen)
1085 {
1086 switch (level) {
1087 case SOL_RAW:
1088 break;
1089
1090 case SOL_ICMPV6:
1091 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1092 return -EOPNOTSUPP;
1093 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1094 case SOL_IPV6:
1095 if (optname == IPV6_CHECKSUM)
1096 break;
1097 default:
1098 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1099 }
1100
1101 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1102 }
1103
1104 #ifdef CONFIG_COMPAT
1105 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
1106 char __user *optval, int __user *optlen)
1107 {
1108 switch (level) {
1109 case SOL_RAW:
1110 break;
1111 case SOL_ICMPV6:
1112 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1113 return -EOPNOTSUPP;
1114 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1115 case SOL_IPV6:
1116 if (optname == IPV6_CHECKSUM)
1117 break;
1118 default:
1119 return compat_ipv6_getsockopt(sk, level, optname,
1120 optval, optlen);
1121 }
1122 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1123 }
1124 #endif
1125
1126 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1127 {
1128 switch (cmd) {
1129 case SIOCOUTQ: {
1130 int amount = sk_wmem_alloc_get(sk);
1131
1132 return put_user(amount, (int __user *)arg);
1133 }
1134 case SIOCINQ: {
1135 struct sk_buff *skb;
1136 int amount = 0;
1137
1138 spin_lock_bh(&sk->sk_receive_queue.lock);
1139 skb = skb_peek(&sk->sk_receive_queue);
1140 if (skb != NULL)
1141 amount = skb_tail_pointer(skb) -
1142 skb_transport_header(skb);
1143 spin_unlock_bh(&sk->sk_receive_queue.lock);
1144 return put_user(amount, (int __user *)arg);
1145 }
1146
1147 default:
1148 #ifdef CONFIG_IPV6_MROUTE
1149 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1150 #else
1151 return -ENOIOCTLCMD;
1152 #endif
1153 }
1154 }
1155
1156 #ifdef CONFIG_COMPAT
1157 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1158 {
1159 switch (cmd) {
1160 case SIOCOUTQ:
1161 case SIOCINQ:
1162 return -ENOIOCTLCMD;
1163 default:
1164 #ifdef CONFIG_IPV6_MROUTE
1165 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1166 #else
1167 return -ENOIOCTLCMD;
1168 #endif
1169 }
1170 }
1171 #endif
1172
1173 static void rawv6_close(struct sock *sk, long timeout)
1174 {
1175 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1176 ip6_ra_control(sk, -1);
1177 ip6mr_sk_done(sk);
1178 sk_common_release(sk);
1179 }
1180
1181 static void raw6_destroy(struct sock *sk)
1182 {
1183 lock_sock(sk);
1184 ip6_flush_pending_frames(sk);
1185 release_sock(sk);
1186
1187 inet6_destroy_sock(sk);
1188 }
1189
1190 static int rawv6_init_sk(struct sock *sk)
1191 {
1192 struct raw6_sock *rp = raw6_sk(sk);
1193
1194 switch (inet_sk(sk)->inet_num) {
1195 case IPPROTO_ICMPV6:
1196 rp->checksum = 1;
1197 rp->offset = 2;
1198 break;
1199 case IPPROTO_MH:
1200 rp->checksum = 1;
1201 rp->offset = 4;
1202 break;
1203 default:
1204 break;
1205 }
1206 return 0;
1207 }
1208
1209 struct proto rawv6_prot = {
1210 .name = "RAWv6",
1211 .owner = THIS_MODULE,
1212 .close = rawv6_close,
1213 .destroy = raw6_destroy,
1214 .connect = ip6_datagram_connect,
1215 .disconnect = udp_disconnect,
1216 .ioctl = rawv6_ioctl,
1217 .init = rawv6_init_sk,
1218 .setsockopt = rawv6_setsockopt,
1219 .getsockopt = rawv6_getsockopt,
1220 .sendmsg = rawv6_sendmsg,
1221 .recvmsg = rawv6_recvmsg,
1222 .bind = rawv6_bind,
1223 .backlog_rcv = rawv6_rcv_skb,
1224 .hash = raw_hash_sk,
1225 .unhash = raw_unhash_sk,
1226 .obj_size = sizeof(struct raw6_sock),
1227 .h.raw_hash = &raw_v6_hashinfo,
1228 #ifdef CONFIG_COMPAT
1229 .compat_setsockopt = compat_rawv6_setsockopt,
1230 .compat_getsockopt = compat_rawv6_getsockopt,
1231 .compat_ioctl = compat_rawv6_ioctl,
1232 #endif
1233 };
1234
1235 #ifdef CONFIG_PROC_FS
1236 static int raw6_seq_show(struct seq_file *seq, void *v)
1237 {
1238 if (v == SEQ_START_TOKEN) {
1239 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1240 } else {
1241 struct sock *sp = v;
1242 __u16 srcp = inet_sk(sp)->inet_num;
1243 ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1244 raw_seq_private(seq)->bucket);
1245 }
1246 return 0;
1247 }
1248
1249 static const struct seq_operations raw6_seq_ops = {
1250 .start = raw_seq_start,
1251 .next = raw_seq_next,
1252 .stop = raw_seq_stop,
1253 .show = raw6_seq_show,
1254 };
1255
1256 static int raw6_seq_open(struct inode *inode, struct file *file)
1257 {
1258 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
1259 }
1260
1261 static const struct file_operations raw6_seq_fops = {
1262 .owner = THIS_MODULE,
1263 .open = raw6_seq_open,
1264 .read = seq_read,
1265 .llseek = seq_lseek,
1266 .release = seq_release_net,
1267 };
1268
1269 static int __net_init raw6_init_net(struct net *net)
1270 {
1271 if (!proc_create("raw6", S_IRUGO, net->proc_net, &raw6_seq_fops))
1272 return -ENOMEM;
1273
1274 return 0;
1275 }
1276
1277 static void __net_exit raw6_exit_net(struct net *net)
1278 {
1279 remove_proc_entry("raw6", net->proc_net);
1280 }
1281
1282 static struct pernet_operations raw6_net_ops = {
1283 .init = raw6_init_net,
1284 .exit = raw6_exit_net,
1285 };
1286
1287 int __init raw6_proc_init(void)
1288 {
1289 return register_pernet_subsys(&raw6_net_ops);
1290 }
1291
1292 void raw6_proc_exit(void)
1293 {
1294 unregister_pernet_subsys(&raw6_net_ops);
1295 }
1296 #endif /* CONFIG_PROC_FS */
1297
1298 /* Same as inet6_dgram_ops, sans udp_poll. */
1299 static const struct proto_ops inet6_sockraw_ops = {
1300 .family = PF_INET6,
1301 .owner = THIS_MODULE,
1302 .release = inet6_release,
1303 .bind = inet6_bind,
1304 .connect = inet_dgram_connect, /* ok */
1305 .socketpair = sock_no_socketpair, /* a do nothing */
1306 .accept = sock_no_accept, /* a do nothing */
1307 .getname = inet6_getname,
1308 .poll = datagram_poll, /* ok */
1309 .ioctl = inet6_ioctl, /* must change */
1310 .listen = sock_no_listen, /* ok */
1311 .shutdown = inet_shutdown, /* ok */
1312 .setsockopt = sock_common_setsockopt, /* ok */
1313 .getsockopt = sock_common_getsockopt, /* ok */
1314 .sendmsg = inet_sendmsg, /* ok */
1315 .recvmsg = sock_common_recvmsg, /* ok */
1316 .mmap = sock_no_mmap,
1317 .sendpage = sock_no_sendpage,
1318 #ifdef CONFIG_COMPAT
1319 .compat_setsockopt = compat_sock_common_setsockopt,
1320 .compat_getsockopt = compat_sock_common_getsockopt,
1321 #endif
1322 };
1323
1324 static struct inet_protosw rawv6_protosw = {
1325 .type = SOCK_RAW,
1326 .protocol = IPPROTO_IP, /* wild card */
1327 .prot = &rawv6_prot,
1328 .ops = &inet6_sockraw_ops,
1329 .no_check = UDP_CSUM_DEFAULT,
1330 .flags = INET_PROTOSW_REUSE,
1331 };
1332
1333 int __init rawv6_init(void)
1334 {
1335 int ret;
1336
1337 ret = inet6_register_protosw(&rawv6_protosw);
1338 if (ret)
1339 goto out;
1340 out:
1341 return ret;
1342 }
1343
1344 void rawv6_exit(void)
1345 {
1346 inet6_unregister_protosw(&rawv6_protosw);
1347 }
Linux kernel - Deliverables
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