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