xref: /openbmc/linux/net/ipv6/raw.c (revision 7f8256ae)
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 
64 struct raw_hashinfo raw_v6_hashinfo;
65 EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
66 
67 bool 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 }
87 EXPORT_SYMBOL_GPL(raw_v6_match);
88 
89 /*
90  *	0 - deliver
91  *	1 - block
92  */
93 static 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)
113 typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
114 
115 static mh_filter_t __rcu *mh_filter __read_mostly;
116 
117 int rawv6_mh_filter_register(mh_filter_t filter)
118 {
119 	rcu_assign_pointer(mh_filter, filter);
120 	return 0;
121 }
122 EXPORT_SYMBOL(rawv6_mh_filter_register);
123 
124 int rawv6_mh_filter_unregister(mh_filter_t filter)
125 {
126 	RCU_INIT_POINTER(mh_filter, NULL);
127 	synchronize_rcu();
128 	return 0;
129 }
130 EXPORT_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  */
141 static 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 		delivered = true;
164 		switch (nexthdr) {
165 		case IPPROTO_ICMPV6:
166 			filtered = icmpv6_filter(sk, skb);
167 			break;
168 
169 #if IS_ENABLED(CONFIG_IPV6_MIP6)
170 		case IPPROTO_MH:
171 		{
172 			/* XXX: To validate MH only once for each packet,
173 			 * this is placed here. It should be after checking
174 			 * xfrm policy, however it doesn't. The checking xfrm
175 			 * policy is placed in rawv6_rcv() because it is
176 			 * required for each socket.
177 			 */
178 			mh_filter_t *filter;
179 
180 			filter = rcu_dereference(mh_filter);
181 			filtered = filter ? (*filter)(sk, skb) : 0;
182 			break;
183 		}
184 #endif
185 		default:
186 			filtered = 0;
187 			break;
188 		}
189 
190 		if (filtered < 0)
191 			break;
192 		if (filtered == 0) {
193 			struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
194 
195 			/* Not releasing hash table! */
196 			if (clone)
197 				rawv6_rcv(sk, clone);
198 		}
199 	}
200 	rcu_read_unlock();
201 	return delivered;
202 }
203 
204 bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
205 {
206 	return ipv6_raw_deliver(skb, nexthdr);
207 }
208 
209 /* This cleans up af_inet6 a bit. -DaveM */
210 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
211 {
212 	struct inet_sock *inet = inet_sk(sk);
213 	struct ipv6_pinfo *np = inet6_sk(sk);
214 	struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
215 	__be32 v4addr = 0;
216 	int addr_type;
217 	int err;
218 
219 	if (addr_len < SIN6_LEN_RFC2133)
220 		return -EINVAL;
221 
222 	if (addr->sin6_family != AF_INET6)
223 		return -EINVAL;
224 
225 	addr_type = ipv6_addr_type(&addr->sin6_addr);
226 
227 	/* Raw sockets are IPv6 only */
228 	if (addr_type == IPV6_ADDR_MAPPED)
229 		return -EADDRNOTAVAIL;
230 
231 	lock_sock(sk);
232 
233 	err = -EINVAL;
234 	if (sk->sk_state != TCP_CLOSE)
235 		goto out;
236 
237 	rcu_read_lock();
238 	/* Check if the address belongs to the host. */
239 	if (addr_type != IPV6_ADDR_ANY) {
240 		struct net_device *dev = NULL;
241 
242 		if (__ipv6_addr_needs_scope_id(addr_type)) {
243 			if (addr_len >= sizeof(struct sockaddr_in6) &&
244 			    addr->sin6_scope_id) {
245 				/* Override any existing binding, if another
246 				 * one is supplied by user.
247 				 */
248 				sk->sk_bound_dev_if = addr->sin6_scope_id;
249 			}
250 
251 			/* Binding to link-local address requires an interface */
252 			if (!sk->sk_bound_dev_if)
253 				goto out_unlock;
254 		}
255 
256 		if (sk->sk_bound_dev_if) {
257 			err = -ENODEV;
258 			dev = dev_get_by_index_rcu(sock_net(sk),
259 						   sk->sk_bound_dev_if);
260 			if (!dev)
261 				goto out_unlock;
262 		}
263 
264 		/* ipv4 addr of the socket is invalid.  Only the
265 		 * unspecified and mapped address have a v4 equivalent.
266 		 */
267 		v4addr = LOOPBACK4_IPV6;
268 		if (!(addr_type & IPV6_ADDR_MULTICAST) &&
269 		    !ipv6_can_nonlocal_bind(sock_net(sk), inet)) {
270 			err = -EADDRNOTAVAIL;
271 			if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
272 					   dev, 0)) {
273 				goto out_unlock;
274 			}
275 		}
276 	}
277 
278 	inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
279 	sk->sk_v6_rcv_saddr = addr->sin6_addr;
280 	if (!(addr_type & IPV6_ADDR_MULTICAST))
281 		np->saddr = addr->sin6_addr;
282 	err = 0;
283 out_unlock:
284 	rcu_read_unlock();
285 out:
286 	release_sock(sk);
287 	return err;
288 }
289 
290 static void rawv6_err(struct sock *sk, struct sk_buff *skb,
291 	       struct inet6_skb_parm *opt,
292 	       u8 type, u8 code, int offset, __be32 info)
293 {
294 	struct inet_sock *inet = inet_sk(sk);
295 	struct ipv6_pinfo *np = inet6_sk(sk);
296 	int err;
297 	int harderr;
298 
299 	/* Report error on raw socket, if:
300 	   1. User requested recverr.
301 	   2. Socket is connected (otherwise the error indication
302 	      is useless without recverr and error is hard.
303 	 */
304 	if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
305 		return;
306 
307 	harderr = icmpv6_err_convert(type, code, &err);
308 	if (type == ICMPV6_PKT_TOOBIG) {
309 		ip6_sk_update_pmtu(skb, sk, info);
310 		harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
311 	}
312 	if (type == NDISC_REDIRECT) {
313 		ip6_sk_redirect(skb, sk);
314 		return;
315 	}
316 	if (np->recverr) {
317 		u8 *payload = skb->data;
318 		if (!inet->hdrincl)
319 			payload += offset;
320 		ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
321 	}
322 
323 	if (np->recverr || harderr) {
324 		sk->sk_err = err;
325 		sk_error_report(sk);
326 	}
327 }
328 
329 void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
330 		u8 type, u8 code, int inner_offset, __be32 info)
331 {
332 	struct net *net = dev_net(skb->dev);
333 	struct hlist_head *hlist;
334 	struct sock *sk;
335 	int hash;
336 
337 	hash = raw_hashfunc(net, nexthdr);
338 	hlist = &raw_v6_hashinfo.ht[hash];
339 	rcu_read_lock();
340 	sk_for_each_rcu(sk, hlist) {
341 		/* Note: ipv6_hdr(skb) != skb->data */
342 		const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
343 
344 		if (!raw_v6_match(net, sk, nexthdr, &ip6h->saddr, &ip6h->daddr,
345 				  inet6_iif(skb), inet6_iif(skb)))
346 			continue;
347 		rawv6_err(sk, skb, NULL, type, code, inner_offset, info);
348 	}
349 	rcu_read_unlock();
350 }
351 
352 static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
353 {
354 	enum skb_drop_reason reason;
355 
356 	if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
357 	    skb_checksum_complete(skb)) {
358 		atomic_inc(&sk->sk_drops);
359 		kfree_skb_reason(skb, SKB_DROP_REASON_SKB_CSUM);
360 		return NET_RX_DROP;
361 	}
362 
363 	/* Charge it to the socket. */
364 	skb_dst_drop(skb);
365 	if (sock_queue_rcv_skb_reason(sk, skb, &reason) < 0) {
366 		kfree_skb_reason(skb, reason);
367 		return NET_RX_DROP;
368 	}
369 
370 	return 0;
371 }
372 
373 /*
374  *	This is next to useless...
375  *	if we demultiplex in network layer we don't need the extra call
376  *	just to queue the skb...
377  *	maybe we could have the network decide upon a hint if it
378  *	should call raw_rcv for demultiplexing
379  */
380 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
381 {
382 	struct inet_sock *inet = inet_sk(sk);
383 	struct raw6_sock *rp = raw6_sk(sk);
384 
385 	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
386 		atomic_inc(&sk->sk_drops);
387 		kfree_skb_reason(skb, SKB_DROP_REASON_XFRM_POLICY);
388 		return NET_RX_DROP;
389 	}
390 	nf_reset_ct(skb);
391 
392 	if (!rp->checksum)
393 		skb->ip_summed = CHECKSUM_UNNECESSARY;
394 
395 	if (skb->ip_summed == CHECKSUM_COMPLETE) {
396 		skb_postpull_rcsum(skb, skb_network_header(skb),
397 				   skb_network_header_len(skb));
398 		if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
399 				     &ipv6_hdr(skb)->daddr,
400 				     skb->len, inet->inet_num, skb->csum))
401 			skb->ip_summed = CHECKSUM_UNNECESSARY;
402 	}
403 	if (!skb_csum_unnecessary(skb))
404 		skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
405 							 &ipv6_hdr(skb)->daddr,
406 							 skb->len,
407 							 inet->inet_num, 0));
408 
409 	if (inet->hdrincl) {
410 		if (skb_checksum_complete(skb)) {
411 			atomic_inc(&sk->sk_drops);
412 			kfree_skb_reason(skb, SKB_DROP_REASON_SKB_CSUM);
413 			return NET_RX_DROP;
414 		}
415 	}
416 
417 	rawv6_rcv_skb(sk, skb);
418 	return 0;
419 }
420 
421 
422 /*
423  *	This should be easy, if there is something there
424  *	we return it, otherwise we block.
425  */
426 
427 static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
428 			 int flags, int *addr_len)
429 {
430 	struct ipv6_pinfo *np = inet6_sk(sk);
431 	DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
432 	struct sk_buff *skb;
433 	size_t copied;
434 	int err;
435 
436 	if (flags & MSG_OOB)
437 		return -EOPNOTSUPP;
438 
439 	if (flags & MSG_ERRQUEUE)
440 		return ipv6_recv_error(sk, msg, len, addr_len);
441 
442 	if (np->rxpmtu && np->rxopt.bits.rxpmtu)
443 		return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
444 
445 	skb = skb_recv_datagram(sk, flags, &err);
446 	if (!skb)
447 		goto out;
448 
449 	copied = skb->len;
450 	if (copied > len) {
451 		copied = len;
452 		msg->msg_flags |= MSG_TRUNC;
453 	}
454 
455 	if (skb_csum_unnecessary(skb)) {
456 		err = skb_copy_datagram_msg(skb, 0, msg, copied);
457 	} else if (msg->msg_flags&MSG_TRUNC) {
458 		if (__skb_checksum_complete(skb))
459 			goto csum_copy_err;
460 		err = skb_copy_datagram_msg(skb, 0, msg, copied);
461 	} else {
462 		err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
463 		if (err == -EINVAL)
464 			goto csum_copy_err;
465 	}
466 	if (err)
467 		goto out_free;
468 
469 	/* Copy the address. */
470 	if (sin6) {
471 		sin6->sin6_family = AF_INET6;
472 		sin6->sin6_port = 0;
473 		sin6->sin6_addr = ipv6_hdr(skb)->saddr;
474 		sin6->sin6_flowinfo = 0;
475 		sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
476 							  inet6_iif(skb));
477 		*addr_len = sizeof(*sin6);
478 	}
479 
480 	sock_recv_cmsgs(msg, sk, skb);
481 
482 	if (np->rxopt.all)
483 		ip6_datagram_recv_ctl(sk, msg, skb);
484 
485 	err = copied;
486 	if (flags & MSG_TRUNC)
487 		err = skb->len;
488 
489 out_free:
490 	skb_free_datagram(sk, skb);
491 out:
492 	return err;
493 
494 csum_copy_err:
495 	skb_kill_datagram(sk, skb, flags);
496 
497 	/* Error for blocking case is chosen to masquerade
498 	   as some normal condition.
499 	 */
500 	err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
501 	goto out;
502 }
503 
504 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
505 				     struct raw6_sock *rp)
506 {
507 	struct ipv6_txoptions *opt;
508 	struct sk_buff *skb;
509 	int err = 0;
510 	int offset;
511 	int len;
512 	int total_len;
513 	__wsum tmp_csum;
514 	__sum16 csum;
515 
516 	if (!rp->checksum)
517 		goto send;
518 
519 	skb = skb_peek(&sk->sk_write_queue);
520 	if (!skb)
521 		goto out;
522 
523 	offset = rp->offset;
524 	total_len = inet_sk(sk)->cork.base.length;
525 	opt = inet6_sk(sk)->cork.opt;
526 	total_len -= opt ? opt->opt_flen : 0;
527 
528 	if (offset >= total_len - 1) {
529 		err = -EINVAL;
530 		ip6_flush_pending_frames(sk);
531 		goto out;
532 	}
533 
534 	/* should be check HW csum miyazawa */
535 	if (skb_queue_len(&sk->sk_write_queue) == 1) {
536 		/*
537 		 * Only one fragment on the socket.
538 		 */
539 		tmp_csum = skb->csum;
540 	} else {
541 		struct sk_buff *csum_skb = NULL;
542 		tmp_csum = 0;
543 
544 		skb_queue_walk(&sk->sk_write_queue, skb) {
545 			tmp_csum = csum_add(tmp_csum, skb->csum);
546 
547 			if (csum_skb)
548 				continue;
549 
550 			len = skb->len - skb_transport_offset(skb);
551 			if (offset >= len) {
552 				offset -= len;
553 				continue;
554 			}
555 
556 			csum_skb = skb;
557 		}
558 
559 		skb = csum_skb;
560 	}
561 
562 	offset += skb_transport_offset(skb);
563 	err = skb_copy_bits(skb, offset, &csum, 2);
564 	if (err < 0) {
565 		ip6_flush_pending_frames(sk);
566 		goto out;
567 	}
568 
569 	/* in case cksum was not initialized */
570 	if (unlikely(csum))
571 		tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
572 
573 	csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
574 			       total_len, fl6->flowi6_proto, tmp_csum);
575 
576 	if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
577 		csum = CSUM_MANGLED_0;
578 
579 	BUG_ON(skb_store_bits(skb, offset, &csum, 2));
580 
581 send:
582 	err = ip6_push_pending_frames(sk);
583 out:
584 	return err;
585 }
586 
587 static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
588 			struct flowi6 *fl6, struct dst_entry **dstp,
589 			unsigned int flags, const struct sockcm_cookie *sockc)
590 {
591 	struct ipv6_pinfo *np = inet6_sk(sk);
592 	struct net *net = sock_net(sk);
593 	struct ipv6hdr *iph;
594 	struct sk_buff *skb;
595 	int err;
596 	struct rt6_info *rt = (struct rt6_info *)*dstp;
597 	int hlen = LL_RESERVED_SPACE(rt->dst.dev);
598 	int tlen = rt->dst.dev->needed_tailroom;
599 
600 	if (length > rt->dst.dev->mtu) {
601 		ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
602 		return -EMSGSIZE;
603 	}
604 	if (length < sizeof(struct ipv6hdr))
605 		return -EINVAL;
606 	if (flags&MSG_PROBE)
607 		goto out;
608 
609 	skb = sock_alloc_send_skb(sk,
610 				  length + hlen + tlen + 15,
611 				  flags & MSG_DONTWAIT, &err);
612 	if (!skb)
613 		goto error;
614 	skb_reserve(skb, hlen);
615 
616 	skb->protocol = htons(ETH_P_IPV6);
617 	skb->priority = sk->sk_priority;
618 	skb->mark = sockc->mark;
619 	skb->tstamp = sockc->transmit_time;
620 
621 	skb_put(skb, length);
622 	skb_reset_network_header(skb);
623 	iph = ipv6_hdr(skb);
624 
625 	skb->ip_summed = CHECKSUM_NONE;
626 
627 	skb_setup_tx_timestamp(skb, sockc->tsflags);
628 
629 	if (flags & MSG_CONFIRM)
630 		skb_set_dst_pending_confirm(skb, 1);
631 
632 	skb->transport_header = skb->network_header;
633 	err = memcpy_from_msg(iph, msg, length);
634 	if (err) {
635 		err = -EFAULT;
636 		kfree_skb(skb);
637 		goto error;
638 	}
639 
640 	skb_dst_set(skb, &rt->dst);
641 	*dstp = NULL;
642 
643 	/* if egress device is enslaved to an L3 master device pass the
644 	 * skb to its handler for processing
645 	 */
646 	skb = l3mdev_ip6_out(sk, skb);
647 	if (unlikely(!skb))
648 		return 0;
649 
650 	/* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev
651 	 * in the error path. Since skb has been freed, the dst could
652 	 * have been queued for deletion.
653 	 */
654 	rcu_read_lock();
655 	IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
656 	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
657 		      NULL, rt->dst.dev, dst_output);
658 	if (err > 0)
659 		err = net_xmit_errno(err);
660 	if (err) {
661 		IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
662 		rcu_read_unlock();
663 		goto error_check;
664 	}
665 	rcu_read_unlock();
666 out:
667 	return 0;
668 
669 error:
670 	IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
671 error_check:
672 	if (err == -ENOBUFS && !np->recverr)
673 		err = 0;
674 	return err;
675 }
676 
677 struct raw6_frag_vec {
678 	struct msghdr *msg;
679 	int hlen;
680 	char c[4];
681 };
682 
683 static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
684 {
685 	int err = 0;
686 	switch (fl6->flowi6_proto) {
687 	case IPPROTO_ICMPV6:
688 		rfv->hlen = 2;
689 		err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
690 		if (!err) {
691 			fl6->fl6_icmp_type = rfv->c[0];
692 			fl6->fl6_icmp_code = rfv->c[1];
693 		}
694 		break;
695 	case IPPROTO_MH:
696 		rfv->hlen = 4;
697 		err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
698 		if (!err)
699 			fl6->fl6_mh_type = rfv->c[2];
700 	}
701 	return err;
702 }
703 
704 static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
705 		       struct sk_buff *skb)
706 {
707 	struct raw6_frag_vec *rfv = from;
708 
709 	if (offset < rfv->hlen) {
710 		int copy = min(rfv->hlen - offset, len);
711 
712 		if (skb->ip_summed == CHECKSUM_PARTIAL)
713 			memcpy(to, rfv->c + offset, copy);
714 		else
715 			skb->csum = csum_block_add(
716 				skb->csum,
717 				csum_partial_copy_nocheck(rfv->c + offset,
718 							  to, copy),
719 				odd);
720 
721 		odd = 0;
722 		offset += copy;
723 		to += copy;
724 		len -= copy;
725 
726 		if (!len)
727 			return 0;
728 	}
729 
730 	offset -= rfv->hlen;
731 
732 	return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
733 }
734 
735 static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
736 {
737 	struct ipv6_txoptions *opt_to_free = NULL;
738 	struct ipv6_txoptions opt_space;
739 	DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
740 	struct in6_addr *daddr, *final_p, final;
741 	struct inet_sock *inet = inet_sk(sk);
742 	struct ipv6_pinfo *np = inet6_sk(sk);
743 	struct raw6_sock *rp = raw6_sk(sk);
744 	struct ipv6_txoptions *opt = NULL;
745 	struct ip6_flowlabel *flowlabel = NULL;
746 	struct dst_entry *dst = NULL;
747 	struct raw6_frag_vec rfv;
748 	struct flowi6 fl6;
749 	struct ipcm6_cookie ipc6;
750 	int addr_len = msg->msg_namelen;
751 	int hdrincl;
752 	u16 proto;
753 	int err;
754 
755 	/* Rough check on arithmetic overflow,
756 	   better check is made in ip6_append_data().
757 	 */
758 	if (len > INT_MAX)
759 		return -EMSGSIZE;
760 
761 	/* Mirror BSD error message compatibility */
762 	if (msg->msg_flags & MSG_OOB)
763 		return -EOPNOTSUPP;
764 
765 	/* hdrincl should be READ_ONCE(inet->hdrincl)
766 	 * but READ_ONCE() doesn't work with bit fields.
767 	 * Doing this indirectly yields the same result.
768 	 */
769 	hdrincl = inet->hdrincl;
770 	hdrincl = READ_ONCE(hdrincl);
771 
772 	/*
773 	 *	Get and verify the address.
774 	 */
775 	memset(&fl6, 0, sizeof(fl6));
776 
777 	fl6.flowi6_mark = sk->sk_mark;
778 	fl6.flowi6_uid = sk->sk_uid;
779 
780 	ipcm6_init(&ipc6);
781 	ipc6.sockc.tsflags = sk->sk_tsflags;
782 	ipc6.sockc.mark = sk->sk_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 			return -EINVAL;
798 
799 		if (proto > 255)
800 			return -EINVAL;
801 
802 		daddr = &sin6->sin6_addr;
803 		if (np->sndflow) {
804 			fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
805 			if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
806 				flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
807 				if (IS_ERR(flowlabel))
808 					return -EINVAL;
809 			}
810 		}
811 
812 		/*
813 		 * Otherwise it will be difficult to maintain
814 		 * sk->sk_dst_cache.
815 		 */
816 		if (sk->sk_state == TCP_ESTABLISHED &&
817 		    ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
818 			daddr = &sk->sk_v6_daddr;
819 
820 		if (addr_len >= sizeof(struct sockaddr_in6) &&
821 		    sin6->sin6_scope_id &&
822 		    __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
823 			fl6.flowi6_oif = sin6->sin6_scope_id;
824 	} else {
825 		if (sk->sk_state != TCP_ESTABLISHED)
826 			return -EDESTADDRREQ;
827 
828 		proto = inet->inet_num;
829 		daddr = &sk->sk_v6_daddr;
830 		fl6.flowlabel = np->flow_label;
831 	}
832 
833 	if (fl6.flowi6_oif == 0)
834 		fl6.flowi6_oif = sk->sk_bound_dev_if;
835 
836 	if (msg->msg_controllen) {
837 		opt = &opt_space;
838 		memset(opt, 0, sizeof(struct ipv6_txoptions));
839 		opt->tot_len = sizeof(struct ipv6_txoptions);
840 		ipc6.opt = opt;
841 
842 		err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
843 		if (err < 0) {
844 			fl6_sock_release(flowlabel);
845 			return err;
846 		}
847 		if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
848 			flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
849 			if (IS_ERR(flowlabel))
850 				return -EINVAL;
851 		}
852 		if (!(opt->opt_nflen|opt->opt_flen))
853 			opt = NULL;
854 	}
855 	if (!opt) {
856 		opt = txopt_get(np);
857 		opt_to_free = opt;
858 	}
859 	if (flowlabel)
860 		opt = fl6_merge_options(&opt_space, flowlabel, opt);
861 	opt = ipv6_fixup_options(&opt_space, opt);
862 
863 	fl6.flowi6_proto = proto;
864 	fl6.flowi6_mark = ipc6.sockc.mark;
865 
866 	if (!hdrincl) {
867 		rfv.msg = msg;
868 		rfv.hlen = 0;
869 		err = rawv6_probe_proto_opt(&rfv, &fl6);
870 		if (err)
871 			goto out;
872 	}
873 
874 	if (!ipv6_addr_any(daddr))
875 		fl6.daddr = *daddr;
876 	else
877 		fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
878 	if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
879 		fl6.saddr = np->saddr;
880 
881 	final_p = fl6_update_dst(&fl6, opt, &final);
882 
883 	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
884 		fl6.flowi6_oif = np->mcast_oif;
885 	else if (!fl6.flowi6_oif)
886 		fl6.flowi6_oif = np->ucast_oif;
887 	security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
888 
889 	if (hdrincl)
890 		fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH;
891 
892 	if (ipc6.tclass < 0)
893 		ipc6.tclass = np->tclass;
894 
895 	fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
896 
897 	dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
898 	if (IS_ERR(dst)) {
899 		err = PTR_ERR(dst);
900 		goto out;
901 	}
902 	if (ipc6.hlimit < 0)
903 		ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
904 
905 	if (ipc6.dontfrag < 0)
906 		ipc6.dontfrag = np->dontfrag;
907 
908 	if (msg->msg_flags&MSG_CONFIRM)
909 		goto do_confirm;
910 
911 back_from_confirm:
912 	if (hdrincl)
913 		err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst,
914 					msg->msg_flags, &ipc6.sockc);
915 	else {
916 		ipc6.opt = opt;
917 		lock_sock(sk);
918 		err = ip6_append_data(sk, raw6_getfrag, &rfv,
919 			len, 0, &ipc6, &fl6, (struct rt6_info *)dst,
920 			msg->msg_flags);
921 
922 		if (err)
923 			ip6_flush_pending_frames(sk);
924 		else if (!(msg->msg_flags & MSG_MORE))
925 			err = rawv6_push_pending_frames(sk, &fl6, rp);
926 		release_sock(sk);
927 	}
928 done:
929 	dst_release(dst);
930 out:
931 	fl6_sock_release(flowlabel);
932 	txopt_put(opt_to_free);
933 	return err < 0 ? err : len;
934 do_confirm:
935 	if (msg->msg_flags & MSG_PROBE)
936 		dst_confirm_neigh(dst, &fl6.daddr);
937 	if (!(msg->msg_flags & MSG_PROBE) || len)
938 		goto back_from_confirm;
939 	err = 0;
940 	goto done;
941 }
942 
943 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
944 			       sockptr_t optval, int optlen)
945 {
946 	switch (optname) {
947 	case ICMPV6_FILTER:
948 		if (optlen > sizeof(struct icmp6_filter))
949 			optlen = sizeof(struct icmp6_filter);
950 		if (copy_from_sockptr(&raw6_sk(sk)->filter, optval, optlen))
951 			return -EFAULT;
952 		return 0;
953 	default:
954 		return -ENOPROTOOPT;
955 	}
956 
957 	return 0;
958 }
959 
960 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
961 			       char __user *optval, int __user *optlen)
962 {
963 	int len;
964 
965 	switch (optname) {
966 	case ICMPV6_FILTER:
967 		if (get_user(len, optlen))
968 			return -EFAULT;
969 		if (len < 0)
970 			return -EINVAL;
971 		if (len > sizeof(struct icmp6_filter))
972 			len = sizeof(struct icmp6_filter);
973 		if (put_user(len, optlen))
974 			return -EFAULT;
975 		if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
976 			return -EFAULT;
977 		return 0;
978 	default:
979 		return -ENOPROTOOPT;
980 	}
981 
982 	return 0;
983 }
984 
985 
986 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
987 			       sockptr_t optval, unsigned int optlen)
988 {
989 	struct raw6_sock *rp = raw6_sk(sk);
990 	int val;
991 
992 	if (optlen < sizeof(val))
993 		return -EINVAL;
994 
995 	if (copy_from_sockptr(&val, optval, sizeof(val)))
996 		return -EFAULT;
997 
998 	switch (optname) {
999 	case IPV6_HDRINCL:
1000 		if (sk->sk_type != SOCK_RAW)
1001 			return -EINVAL;
1002 		inet_sk(sk)->hdrincl = !!val;
1003 		return 0;
1004 	case IPV6_CHECKSUM:
1005 		if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
1006 		    level == IPPROTO_IPV6) {
1007 			/*
1008 			 * RFC3542 tells that IPV6_CHECKSUM socket
1009 			 * option in the IPPROTO_IPV6 level is not
1010 			 * allowed on ICMPv6 sockets.
1011 			 * If you want to set it, use IPPROTO_RAW
1012 			 * level IPV6_CHECKSUM socket option
1013 			 * (Linux extension).
1014 			 */
1015 			return -EINVAL;
1016 		}
1017 
1018 		/* You may get strange result with a positive odd offset;
1019 		   RFC2292bis agrees with me. */
1020 		if (val > 0 && (val&1))
1021 			return -EINVAL;
1022 		if (val < 0) {
1023 			rp->checksum = 0;
1024 		} else {
1025 			rp->checksum = 1;
1026 			rp->offset = val;
1027 		}
1028 
1029 		return 0;
1030 
1031 	default:
1032 		return -ENOPROTOOPT;
1033 	}
1034 }
1035 
1036 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1037 			    sockptr_t optval, unsigned int optlen)
1038 {
1039 	switch (level) {
1040 	case SOL_RAW:
1041 		break;
1042 
1043 	case SOL_ICMPV6:
1044 		if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1045 			return -EOPNOTSUPP;
1046 		return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1047 	case SOL_IPV6:
1048 		if (optname == IPV6_CHECKSUM ||
1049 		    optname == IPV6_HDRINCL)
1050 			break;
1051 		fallthrough;
1052 	default:
1053 		return ipv6_setsockopt(sk, level, optname, optval, optlen);
1054 	}
1055 
1056 	return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1057 }
1058 
1059 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1060 			    char __user *optval, int __user *optlen)
1061 {
1062 	struct raw6_sock *rp = raw6_sk(sk);
1063 	int val, len;
1064 
1065 	if (get_user(len, optlen))
1066 		return -EFAULT;
1067 
1068 	switch (optname) {
1069 	case IPV6_HDRINCL:
1070 		val = inet_sk(sk)->hdrincl;
1071 		break;
1072 	case IPV6_CHECKSUM:
1073 		/*
1074 		 * We allow getsockopt() for IPPROTO_IPV6-level
1075 		 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1076 		 * since RFC3542 is silent about it.
1077 		 */
1078 		if (rp->checksum == 0)
1079 			val = -1;
1080 		else
1081 			val = rp->offset;
1082 		break;
1083 
1084 	default:
1085 		return -ENOPROTOOPT;
1086 	}
1087 
1088 	len = min_t(unsigned int, sizeof(int), len);
1089 
1090 	if (put_user(len, optlen))
1091 		return -EFAULT;
1092 	if (copy_to_user(optval, &val, len))
1093 		return -EFAULT;
1094 	return 0;
1095 }
1096 
1097 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1098 			  char __user *optval, int __user *optlen)
1099 {
1100 	switch (level) {
1101 	case SOL_RAW:
1102 		break;
1103 
1104 	case SOL_ICMPV6:
1105 		if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1106 			return -EOPNOTSUPP;
1107 		return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1108 	case SOL_IPV6:
1109 		if (optname == IPV6_CHECKSUM ||
1110 		    optname == IPV6_HDRINCL)
1111 			break;
1112 		fallthrough;
1113 	default:
1114 		return ipv6_getsockopt(sk, level, optname, optval, optlen);
1115 	}
1116 
1117 	return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1118 }
1119 
1120 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1121 {
1122 	switch (cmd) {
1123 	case SIOCOUTQ: {
1124 		int amount = sk_wmem_alloc_get(sk);
1125 
1126 		return put_user(amount, (int __user *)arg);
1127 	}
1128 	case SIOCINQ: {
1129 		struct sk_buff *skb;
1130 		int amount = 0;
1131 
1132 		spin_lock_bh(&sk->sk_receive_queue.lock);
1133 		skb = skb_peek(&sk->sk_receive_queue);
1134 		if (skb)
1135 			amount = skb->len;
1136 		spin_unlock_bh(&sk->sk_receive_queue.lock);
1137 		return put_user(amount, (int __user *)arg);
1138 	}
1139 
1140 	default:
1141 #ifdef CONFIG_IPV6_MROUTE
1142 		return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1143 #else
1144 		return -ENOIOCTLCMD;
1145 #endif
1146 	}
1147 }
1148 
1149 #ifdef CONFIG_COMPAT
1150 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1151 {
1152 	switch (cmd) {
1153 	case SIOCOUTQ:
1154 	case SIOCINQ:
1155 		return -ENOIOCTLCMD;
1156 	default:
1157 #ifdef CONFIG_IPV6_MROUTE
1158 		return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1159 #else
1160 		return -ENOIOCTLCMD;
1161 #endif
1162 	}
1163 }
1164 #endif
1165 
1166 static void rawv6_close(struct sock *sk, long timeout)
1167 {
1168 	if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1169 		ip6_ra_control(sk, -1);
1170 	ip6mr_sk_done(sk);
1171 	sk_common_release(sk);
1172 }
1173 
1174 static void raw6_destroy(struct sock *sk)
1175 {
1176 	lock_sock(sk);
1177 	ip6_flush_pending_frames(sk);
1178 	release_sock(sk);
1179 }
1180 
1181 static int rawv6_init_sk(struct sock *sk)
1182 {
1183 	struct raw6_sock *rp = raw6_sk(sk);
1184 
1185 	switch (inet_sk(sk)->inet_num) {
1186 	case IPPROTO_ICMPV6:
1187 		rp->checksum = 1;
1188 		rp->offset   = 2;
1189 		break;
1190 	case IPPROTO_MH:
1191 		rp->checksum = 1;
1192 		rp->offset   = 4;
1193 		break;
1194 	default:
1195 		break;
1196 	}
1197 	return 0;
1198 }
1199 
1200 struct proto rawv6_prot = {
1201 	.name		   = "RAWv6",
1202 	.owner		   = THIS_MODULE,
1203 	.close		   = rawv6_close,
1204 	.destroy	   = raw6_destroy,
1205 	.connect	   = ip6_datagram_connect_v6_only,
1206 	.disconnect	   = __udp_disconnect,
1207 	.ioctl		   = rawv6_ioctl,
1208 	.init		   = rawv6_init_sk,
1209 	.setsockopt	   = rawv6_setsockopt,
1210 	.getsockopt	   = rawv6_getsockopt,
1211 	.sendmsg	   = rawv6_sendmsg,
1212 	.recvmsg	   = rawv6_recvmsg,
1213 	.bind		   = rawv6_bind,
1214 	.backlog_rcv	   = rawv6_rcv_skb,
1215 	.hash		   = raw_hash_sk,
1216 	.unhash		   = raw_unhash_sk,
1217 	.obj_size	   = sizeof(struct raw6_sock),
1218 	.useroffset	   = offsetof(struct raw6_sock, filter),
1219 	.usersize	   = sizeof_field(struct raw6_sock, filter),
1220 	.h.raw_hash	   = &raw_v6_hashinfo,
1221 #ifdef CONFIG_COMPAT
1222 	.compat_ioctl	   = compat_rawv6_ioctl,
1223 #endif
1224 	.diag_destroy	   = raw_abort,
1225 };
1226 
1227 #ifdef CONFIG_PROC_FS
1228 static int raw6_seq_show(struct seq_file *seq, void *v)
1229 {
1230 	if (v == SEQ_START_TOKEN) {
1231 		seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1232 	} else {
1233 		struct sock *sp = v;
1234 		__u16 srcp  = inet_sk(sp)->inet_num;
1235 		ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1236 					raw_seq_private(seq)->bucket);
1237 	}
1238 	return 0;
1239 }
1240 
1241 static const struct seq_operations raw6_seq_ops = {
1242 	.start =	raw_seq_start,
1243 	.next =		raw_seq_next,
1244 	.stop =		raw_seq_stop,
1245 	.show =		raw6_seq_show,
1246 };
1247 
1248 static int __net_init raw6_init_net(struct net *net)
1249 {
1250 	if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops,
1251 			sizeof(struct raw_iter_state), &raw_v6_hashinfo))
1252 		return -ENOMEM;
1253 
1254 	return 0;
1255 }
1256 
1257 static void __net_exit raw6_exit_net(struct net *net)
1258 {
1259 	remove_proc_entry("raw6", net->proc_net);
1260 }
1261 
1262 static struct pernet_operations raw6_net_ops = {
1263 	.init = raw6_init_net,
1264 	.exit = raw6_exit_net,
1265 };
1266 
1267 int __init raw6_proc_init(void)
1268 {
1269 	return register_pernet_subsys(&raw6_net_ops);
1270 }
1271 
1272 void raw6_proc_exit(void)
1273 {
1274 	unregister_pernet_subsys(&raw6_net_ops);
1275 }
1276 #endif	/* CONFIG_PROC_FS */
1277 
1278 /* Same as inet6_dgram_ops, sans udp_poll.  */
1279 const struct proto_ops inet6_sockraw_ops = {
1280 	.family		   = PF_INET6,
1281 	.owner		   = THIS_MODULE,
1282 	.release	   = inet6_release,
1283 	.bind		   = inet6_bind,
1284 	.connect	   = inet_dgram_connect,	/* ok		*/
1285 	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/
1286 	.accept		   = sock_no_accept,		/* a do nothing	*/
1287 	.getname	   = inet6_getname,
1288 	.poll		   = datagram_poll,		/* ok		*/
1289 	.ioctl		   = inet6_ioctl,		/* must change  */
1290 	.gettstamp	   = sock_gettstamp,
1291 	.listen		   = sock_no_listen,		/* ok		*/
1292 	.shutdown	   = inet_shutdown,		/* ok		*/
1293 	.setsockopt	   = sock_common_setsockopt,	/* ok		*/
1294 	.getsockopt	   = sock_common_getsockopt,	/* ok		*/
1295 	.sendmsg	   = inet_sendmsg,		/* ok		*/
1296 	.recvmsg	   = sock_common_recvmsg,	/* ok		*/
1297 	.mmap		   = sock_no_mmap,
1298 	.sendpage	   = sock_no_sendpage,
1299 #ifdef CONFIG_COMPAT
1300 	.compat_ioctl	   = inet6_compat_ioctl,
1301 #endif
1302 };
1303 
1304 static struct inet_protosw rawv6_protosw = {
1305 	.type		= SOCK_RAW,
1306 	.protocol	= IPPROTO_IP,	/* wild card */
1307 	.prot		= &rawv6_prot,
1308 	.ops		= &inet6_sockraw_ops,
1309 	.flags		= INET_PROTOSW_REUSE,
1310 };
1311 
1312 int __init rawv6_init(void)
1313 {
1314 	return inet6_register_protosw(&rawv6_protosw);
1315 }
1316 
1317 void rawv6_exit(void)
1318 {
1319 	inet6_unregister_protosw(&rawv6_protosw);
1320 }
1321