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v5.9
   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *	RAW sockets for IPv6
   4 *	Linux INET6 implementation
   5 *
   6 *	Authors:
   7 *	Pedro Roque		<roque@di.fc.ul.pt>
   8 *
   9 *	Adapted from linux/net/ipv4/raw.c
  10 *
  11 *	Fixes:
  12 *	Hideaki YOSHIFUJI	:	sin6_scope_id support
  13 *	YOSHIFUJI,H.@USAGI	:	raw checksum (RFC2292(bis) compliance)
  14 *	Kazunori MIYAZAWA @USAGI:	change process style to use ip6_append_data
  15 */
  16
  17#include <linux/errno.h>
  18#include <linux/types.h>
  19#include <linux/socket.h>
  20#include <linux/slab.h>
  21#include <linux/sockios.h>
  22#include <linux/net.h>
  23#include <linux/in6.h>
  24#include <linux/netdevice.h>
  25#include <linux/if_arp.h>
  26#include <linux/icmpv6.h>
  27#include <linux/netfilter.h>
  28#include <linux/netfilter_ipv6.h>
  29#include <linux/skbuff.h>
  30#include <linux/compat.h>
  31#include <linux/uaccess.h>
  32#include <asm/ioctls.h>
  33
  34#include <net/net_namespace.h>
  35#include <net/ip.h>
  36#include <net/sock.h>
  37#include <net/snmp.h>
  38
  39#include <net/ipv6.h>
  40#include <net/ndisc.h>
  41#include <net/protocol.h>
  42#include <net/ip6_route.h>
  43#include <net/ip6_checksum.h>
  44#include <net/addrconf.h>
  45#include <net/transp_v6.h>
  46#include <net/udp.h>
  47#include <net/inet_common.h>
  48#include <net/tcp_states.h>
  49#if IS_ENABLED(CONFIG_IPV6_MIP6)
  50#include <net/mip6.h>
  51#endif
  52#include <linux/mroute6.h>
  53
  54#include <net/raw.h>
  55#include <net/rawv6.h>
  56#include <net/xfrm.h>
  57
  58#include <linux/proc_fs.h>
  59#include <linux/seq_file.h>
  60#include <linux/export.h>
  61
  62#define	ICMPV6_HDRLEN	4	/* ICMPv6 header, RFC 4443 Section 2.1 */
  63
  64struct raw_hashinfo raw_v6_hashinfo = {
  65	.lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
  66};
  67EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
  68
  69struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
  70		unsigned short num, const struct in6_addr *loc_addr,
  71		const struct in6_addr *rmt_addr, int dif, int sdif)
  72{
  73	bool is_multicast = ipv6_addr_is_multicast(loc_addr);
  74
  75	sk_for_each_from(sk)
  76		if (inet_sk(sk)->inet_num == num) {
  77
  78			if (!net_eq(sock_net(sk), net))
  79				continue;
  80
  81			if (!ipv6_addr_any(&sk->sk_v6_daddr) &&
  82			    !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr))
  83				continue;
  84
  85			if (!raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
  86						 dif, sdif))
  87				continue;
  88
  89			if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
  90				if (ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))
  91					goto found;
  92				if (is_multicast &&
  93				    inet6_mc_check(sk, loc_addr, rmt_addr))
  94					goto found;
  95				continue;
  96			}
  97			goto found;
  98		}
  99	sk = NULL;
 100found:
 101	return sk;
 102}
 103EXPORT_SYMBOL_GPL(__raw_v6_lookup);
 104
 105/*
 106 *	0 - deliver
 107 *	1 - block
 108 */
 109static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
 110{
 111	struct icmp6hdr _hdr;
 112	const struct icmp6hdr *hdr;
 113
 114	/* We require only the four bytes of the ICMPv6 header, not any
 115	 * additional bytes of message body in "struct icmp6hdr".
 116	 */
 117	hdr = skb_header_pointer(skb, skb_transport_offset(skb),
 118				 ICMPV6_HDRLEN, &_hdr);
 119	if (hdr) {
 120		const __u32 *data = &raw6_sk(sk)->filter.data[0];
 121		unsigned int type = hdr->icmp6_type;
 122
 123		return (data[type >> 5] & (1U << (type & 31))) != 0;
 124	}
 125	return 1;
 126}
 127
 128#if IS_ENABLED(CONFIG_IPV6_MIP6)
 129typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
 130
 131static mh_filter_t __rcu *mh_filter __read_mostly;
 132
 133int rawv6_mh_filter_register(mh_filter_t filter)
 134{
 135	rcu_assign_pointer(mh_filter, filter);
 136	return 0;
 137}
 138EXPORT_SYMBOL(rawv6_mh_filter_register);
 139
 140int rawv6_mh_filter_unregister(mh_filter_t filter)
 141{
 142	RCU_INIT_POINTER(mh_filter, NULL);
 143	synchronize_rcu();
 144	return 0;
 145}
 146EXPORT_SYMBOL(rawv6_mh_filter_unregister);
 147
 148#endif
 149
 150/*
 151 *	demultiplex raw sockets.
 152 *	(should consider queueing the skb in the sock receive_queue
 153 *	without calling rawv6.c)
 154 *
 155 *	Caller owns SKB so we must make clones.
 156 */
 157static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
 158{
 
 
 
 159	const struct in6_addr *saddr;
 160	const struct in6_addr *daddr;
 161	struct sock *sk;
 162	bool delivered = false;
 163	__u8 hash;
 164	struct net *net;
 165
 166	saddr = &ipv6_hdr(skb)->saddr;
 167	daddr = saddr + 1;
 168
 169	hash = nexthdr & (RAW_HTABLE_SIZE - 1);
 170
 171	read_lock(&raw_v6_hashinfo.lock);
 172	sk = sk_head(&raw_v6_hashinfo.ht[hash]);
 173
 174	if (!sk)
 175		goto out;
 176
 177	net = dev_net(skb->dev);
 178	sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr,
 179			     inet6_iif(skb), inet6_sdif(skb));
 180
 181	while (sk) {
 182		int filtered;
 183
 
 
 
 184		delivered = true;
 185		switch (nexthdr) {
 186		case IPPROTO_ICMPV6:
 187			filtered = icmpv6_filter(sk, skb);
 188			break;
 189
 190#if IS_ENABLED(CONFIG_IPV6_MIP6)
 191		case IPPROTO_MH:
 192		{
 193			/* XXX: To validate MH only once for each packet,
 194			 * this is placed here. It should be after checking
 195			 * xfrm policy, however it doesn't. The checking xfrm
 196			 * policy is placed in rawv6_rcv() because it is
 197			 * required for each socket.
 198			 */
 199			mh_filter_t *filter;
 200
 201			filter = rcu_dereference(mh_filter);
 202			filtered = filter ? (*filter)(sk, skb) : 0;
 203			break;
 204		}
 205#endif
 206		default:
 207			filtered = 0;
 208			break;
 209		}
 210
 211		if (filtered < 0)
 212			break;
 213		if (filtered == 0) {
 214			struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
 215
 216			/* Not releasing hash table! */
 217			if (clone) {
 218				nf_reset_ct(clone);
 219				rawv6_rcv(sk, clone);
 220			}
 221		}
 222		sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
 223				     inet6_iif(skb), inet6_sdif(skb));
 224	}
 225out:
 226	read_unlock(&raw_v6_hashinfo.lock);
 227	return delivered;
 228}
 229
 230bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
 231{
 232	struct sock *raw_sk;
 233
 234	raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]);
 235	if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
 236		raw_sk = NULL;
 237
 238	return raw_sk != NULL;
 239}
 240
 241/* This cleans up af_inet6 a bit. -DaveM */
 242static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 243{
 244	struct inet_sock *inet = inet_sk(sk);
 245	struct ipv6_pinfo *np = inet6_sk(sk);
 246	struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
 247	__be32 v4addr = 0;
 248	int addr_type;
 249	int err;
 250
 251	if (addr_len < SIN6_LEN_RFC2133)
 252		return -EINVAL;
 253
 254	if (addr->sin6_family != AF_INET6)
 255		return -EINVAL;
 256
 257	addr_type = ipv6_addr_type(&addr->sin6_addr);
 258
 259	/* Raw sockets are IPv6 only */
 260	if (addr_type == IPV6_ADDR_MAPPED)
 261		return -EADDRNOTAVAIL;
 262
 263	lock_sock(sk);
 264
 265	err = -EINVAL;
 266	if (sk->sk_state != TCP_CLOSE)
 267		goto out;
 268
 269	rcu_read_lock();
 270	/* Check if the address belongs to the host. */
 271	if (addr_type != IPV6_ADDR_ANY) {
 272		struct net_device *dev = NULL;
 273
 274		if (__ipv6_addr_needs_scope_id(addr_type)) {
 275			if (addr_len >= sizeof(struct sockaddr_in6) &&
 276			    addr->sin6_scope_id) {
 277				/* Override any existing binding, if another
 278				 * one is supplied by user.
 279				 */
 280				sk->sk_bound_dev_if = addr->sin6_scope_id;
 281			}
 282
 283			/* Binding to link-local address requires an interface */
 284			if (!sk->sk_bound_dev_if)
 285				goto out_unlock;
 286		}
 287
 288		if (sk->sk_bound_dev_if) {
 289			err = -ENODEV;
 290			dev = dev_get_by_index_rcu(sock_net(sk),
 291						   sk->sk_bound_dev_if);
 292			if (!dev)
 293				goto out_unlock;
 294		}
 295
 296		/* ipv4 addr of the socket is invalid.  Only the
 297		 * unspecified and mapped address have a v4 equivalent.
 298		 */
 299		v4addr = LOOPBACK4_IPV6;
 300		if (!(addr_type & IPV6_ADDR_MULTICAST) &&
 301		    !sock_net(sk)->ipv6.sysctl.ip_nonlocal_bind) {
 302			err = -EADDRNOTAVAIL;
 303			if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
 304					   dev, 0)) {
 305				goto out_unlock;
 306			}
 307		}
 308	}
 309
 310	inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
 311	sk->sk_v6_rcv_saddr = addr->sin6_addr;
 312	if (!(addr_type & IPV6_ADDR_MULTICAST))
 313		np->saddr = addr->sin6_addr;
 314	err = 0;
 315out_unlock:
 316	rcu_read_unlock();
 317out:
 318	release_sock(sk);
 319	return err;
 320}
 321
 322static void rawv6_err(struct sock *sk, struct sk_buff *skb,
 323	       struct inet6_skb_parm *opt,
 324	       u8 type, u8 code, int offset, __be32 info)
 325{
 326	struct inet_sock *inet = inet_sk(sk);
 327	struct ipv6_pinfo *np = inet6_sk(sk);
 328	int err;
 329	int harderr;
 330
 331	/* Report error on raw socket, if:
 332	   1. User requested recverr.
 333	   2. Socket is connected (otherwise the error indication
 334	      is useless without recverr and error is hard.
 335	 */
 336	if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
 337		return;
 338
 339	harderr = icmpv6_err_convert(type, code, &err);
 340	if (type == ICMPV6_PKT_TOOBIG) {
 341		ip6_sk_update_pmtu(skb, sk, info);
 342		harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
 343	}
 344	if (type == NDISC_REDIRECT) {
 345		ip6_sk_redirect(skb, sk);
 346		return;
 347	}
 348	if (np->recverr) {
 349		u8 *payload = skb->data;
 350		if (!inet->hdrincl)
 351			payload += offset;
 352		ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
 353	}
 354
 355	if (np->recverr || harderr) {
 356		sk->sk_err = err;
 357		sk->sk_error_report(sk);
 358	}
 359}
 360
 361void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
 362		u8 type, u8 code, int inner_offset, __be32 info)
 363{
 
 
 
 364	struct sock *sk;
 365	int hash;
 366	const struct in6_addr *saddr, *daddr;
 367	struct net *net;
 368
 369	hash = nexthdr & (RAW_HTABLE_SIZE - 1);
 370
 371	read_lock(&raw_v6_hashinfo.lock);
 372	sk = sk_head(&raw_v6_hashinfo.ht[hash]);
 373	if (sk) {
 374		/* Note: ipv6_hdr(skb) != skb->data */
 375		const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
 376		saddr = &ip6h->saddr;
 377		daddr = &ip6h->daddr;
 378		net = dev_net(skb->dev);
 379
 380		while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
 381					     inet6_iif(skb), inet6_iif(skb)))) {
 382			rawv6_err(sk, skb, NULL, type, code,
 383					inner_offset, info);
 384			sk = sk_next(sk);
 385		}
 386	}
 387	read_unlock(&raw_v6_hashinfo.lock);
 388}
 389
 390static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
 391{
 392	if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
 393	    skb_checksum_complete(skb)) {
 394		atomic_inc(&sk->sk_drops);
 395		kfree_skb(skb);
 396		return NET_RX_DROP;
 397	}
 398
 399	/* Charge it to the socket. */
 400	skb_dst_drop(skb);
 401	if (sock_queue_rcv_skb(sk, skb) < 0) {
 402		kfree_skb(skb);
 403		return NET_RX_DROP;
 404	}
 405
 406	return 0;
 407}
 408
 409/*
 410 *	This is next to useless...
 411 *	if we demultiplex in network layer we don't need the extra call
 412 *	just to queue the skb...
 413 *	maybe we could have the network decide upon a hint if it
 414 *	should call raw_rcv for demultiplexing
 415 */
 416int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
 417{
 418	struct inet_sock *inet = inet_sk(sk);
 419	struct raw6_sock *rp = raw6_sk(sk);
 420
 421	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
 422		atomic_inc(&sk->sk_drops);
 423		kfree_skb(skb);
 424		return NET_RX_DROP;
 425	}
 426
 427	if (!rp->checksum)
 428		skb->ip_summed = CHECKSUM_UNNECESSARY;
 429
 430	if (skb->ip_summed == CHECKSUM_COMPLETE) {
 431		skb_postpull_rcsum(skb, skb_network_header(skb),
 432				   skb_network_header_len(skb));
 433		if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 434				     &ipv6_hdr(skb)->daddr,
 435				     skb->len, inet->inet_num, skb->csum))
 436			skb->ip_summed = CHECKSUM_UNNECESSARY;
 437	}
 438	if (!skb_csum_unnecessary(skb))
 439		skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 440							 &ipv6_hdr(skb)->daddr,
 441							 skb->len,
 442							 inet->inet_num, 0));
 443
 444	if (inet->hdrincl) {
 445		if (skb_checksum_complete(skb)) {
 446			atomic_inc(&sk->sk_drops);
 447			kfree_skb(skb);
 448			return NET_RX_DROP;
 449		}
 450	}
 451
 452	rawv6_rcv_skb(sk, skb);
 453	return 0;
 454}
 455
 456
 457/*
 458 *	This should be easy, if there is something there
 459 *	we return it, otherwise we block.
 460 */
 461
 462static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 463			 int noblock, int flags, int *addr_len)
 464{
 465	struct ipv6_pinfo *np = inet6_sk(sk);
 466	DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
 467	struct sk_buff *skb;
 468	size_t copied;
 469	int err;
 470
 471	if (flags & MSG_OOB)
 472		return -EOPNOTSUPP;
 473
 474	if (flags & MSG_ERRQUEUE)
 475		return ipv6_recv_error(sk, msg, len, addr_len);
 476
 477	if (np->rxpmtu && np->rxopt.bits.rxpmtu)
 478		return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
 479
 480	skb = skb_recv_datagram(sk, flags, noblock, &err);
 481	if (!skb)
 482		goto out;
 483
 484	copied = skb->len;
 485	if (copied > len) {
 486		copied = len;
 487		msg->msg_flags |= MSG_TRUNC;
 488	}
 489
 490	if (skb_csum_unnecessary(skb)) {
 491		err = skb_copy_datagram_msg(skb, 0, msg, copied);
 492	} else if (msg->msg_flags&MSG_TRUNC) {
 493		if (__skb_checksum_complete(skb))
 494			goto csum_copy_err;
 495		err = skb_copy_datagram_msg(skb, 0, msg, copied);
 496	} else {
 497		err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
 498		if (err == -EINVAL)
 499			goto csum_copy_err;
 500	}
 501	if (err)
 502		goto out_free;
 503
 504	/* Copy the address. */
 505	if (sin6) {
 506		sin6->sin6_family = AF_INET6;
 507		sin6->sin6_port = 0;
 508		sin6->sin6_addr = ipv6_hdr(skb)->saddr;
 509		sin6->sin6_flowinfo = 0;
 510		sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
 511							  inet6_iif(skb));
 512		*addr_len = sizeof(*sin6);
 513	}
 514
 515	sock_recv_ts_and_drops(msg, sk, skb);
 516
 517	if (np->rxopt.all)
 518		ip6_datagram_recv_ctl(sk, msg, skb);
 519
 520	err = copied;
 521	if (flags & MSG_TRUNC)
 522		err = skb->len;
 523
 524out_free:
 525	skb_free_datagram(sk, skb);
 526out:
 527	return err;
 528
 529csum_copy_err:
 530	skb_kill_datagram(sk, skb, flags);
 531
 532	/* Error for blocking case is chosen to masquerade
 533	   as some normal condition.
 534	 */
 535	err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
 536	goto out;
 537}
 538
 539static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
 540				     struct raw6_sock *rp)
 541{
 
 542	struct sk_buff *skb;
 543	int err = 0;
 544	int offset;
 545	int len;
 546	int total_len;
 547	__wsum tmp_csum;
 548	__sum16 csum;
 549
 550	if (!rp->checksum)
 551		goto send;
 552
 553	skb = skb_peek(&sk->sk_write_queue);
 554	if (!skb)
 555		goto out;
 556
 557	offset = rp->offset;
 558	total_len = inet_sk(sk)->cork.base.length;
 
 
 
 559	if (offset >= total_len - 1) {
 560		err = -EINVAL;
 561		ip6_flush_pending_frames(sk);
 562		goto out;
 563	}
 564
 565	/* should be check HW csum miyazawa */
 566	if (skb_queue_len(&sk->sk_write_queue) == 1) {
 567		/*
 568		 * Only one fragment on the socket.
 569		 */
 570		tmp_csum = skb->csum;
 571	} else {
 572		struct sk_buff *csum_skb = NULL;
 573		tmp_csum = 0;
 574
 575		skb_queue_walk(&sk->sk_write_queue, skb) {
 576			tmp_csum = csum_add(tmp_csum, skb->csum);
 577
 578			if (csum_skb)
 579				continue;
 580
 581			len = skb->len - skb_transport_offset(skb);
 582			if (offset >= len) {
 583				offset -= len;
 584				continue;
 585			}
 586
 587			csum_skb = skb;
 588		}
 589
 590		skb = csum_skb;
 591	}
 592
 593	offset += skb_transport_offset(skb);
 594	err = skb_copy_bits(skb, offset, &csum, 2);
 595	if (err < 0) {
 596		ip6_flush_pending_frames(sk);
 597		goto out;
 598	}
 599
 600	/* in case cksum was not initialized */
 601	if (unlikely(csum))
 602		tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
 603
 604	csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
 605			       total_len, fl6->flowi6_proto, tmp_csum);
 606
 607	if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
 608		csum = CSUM_MANGLED_0;
 609
 610	BUG_ON(skb_store_bits(skb, offset, &csum, 2));
 611
 612send:
 613	err = ip6_push_pending_frames(sk);
 614out:
 615	return err;
 616}
 617
 618static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
 619			struct flowi6 *fl6, struct dst_entry **dstp,
 620			unsigned int flags, const struct sockcm_cookie *sockc)
 621{
 622	struct ipv6_pinfo *np = inet6_sk(sk);
 623	struct net *net = sock_net(sk);
 624	struct ipv6hdr *iph;
 625	struct sk_buff *skb;
 626	int err;
 627	struct rt6_info *rt = (struct rt6_info *)*dstp;
 628	int hlen = LL_RESERVED_SPACE(rt->dst.dev);
 629	int tlen = rt->dst.dev->needed_tailroom;
 630
 631	if (length > rt->dst.dev->mtu) {
 632		ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
 633		return -EMSGSIZE;
 634	}
 635	if (length < sizeof(struct ipv6hdr))
 636		return -EINVAL;
 637	if (flags&MSG_PROBE)
 638		goto out;
 639
 640	skb = sock_alloc_send_skb(sk,
 641				  length + hlen + tlen + 15,
 642				  flags & MSG_DONTWAIT, &err);
 643	if (!skb)
 644		goto error;
 645	skb_reserve(skb, hlen);
 646
 647	skb->protocol = htons(ETH_P_IPV6);
 648	skb->priority = sk->sk_priority;
 649	skb->mark = sockc->mark;
 650	skb->tstamp = sockc->transmit_time;
 651
 652	skb_put(skb, length);
 653	skb_reset_network_header(skb);
 654	iph = ipv6_hdr(skb);
 655
 656	skb->ip_summed = CHECKSUM_NONE;
 657
 658	skb_setup_tx_timestamp(skb, sockc->tsflags);
 659
 660	if (flags & MSG_CONFIRM)
 661		skb_set_dst_pending_confirm(skb, 1);
 662
 663	skb->transport_header = skb->network_header;
 664	err = memcpy_from_msg(iph, msg, length);
 665	if (err) {
 666		err = -EFAULT;
 667		kfree_skb(skb);
 668		goto error;
 669	}
 670
 671	skb_dst_set(skb, &rt->dst);
 672	*dstp = NULL;
 673
 674	/* if egress device is enslaved to an L3 master device pass the
 675	 * skb to its handler for processing
 676	 */
 677	skb = l3mdev_ip6_out(sk, skb);
 678	if (unlikely(!skb))
 679		return 0;
 680
 681	/* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev
 682	 * in the error path. Since skb has been freed, the dst could
 683	 * have been queued for deletion.
 684	 */
 685	rcu_read_lock();
 686	IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
 687	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
 688		      NULL, rt->dst.dev, dst_output);
 689	if (err > 0)
 690		err = net_xmit_errno(err);
 691	if (err) {
 692		IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
 693		rcu_read_unlock();
 694		goto error_check;
 695	}
 696	rcu_read_unlock();
 697out:
 698	return 0;
 699
 700error:
 701	IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
 702error_check:
 703	if (err == -ENOBUFS && !np->recverr)
 704		err = 0;
 705	return err;
 706}
 707
 708struct raw6_frag_vec {
 709	struct msghdr *msg;
 710	int hlen;
 711	char c[4];
 712};
 713
 714static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
 715{
 716	int err = 0;
 717	switch (fl6->flowi6_proto) {
 718	case IPPROTO_ICMPV6:
 719		rfv->hlen = 2;
 720		err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
 721		if (!err) {
 722			fl6->fl6_icmp_type = rfv->c[0];
 723			fl6->fl6_icmp_code = rfv->c[1];
 724		}
 725		break;
 726	case IPPROTO_MH:
 727		rfv->hlen = 4;
 728		err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
 729		if (!err)
 730			fl6->fl6_mh_type = rfv->c[2];
 731	}
 732	return err;
 733}
 734
 735static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
 736		       struct sk_buff *skb)
 737{
 738	struct raw6_frag_vec *rfv = from;
 739
 740	if (offset < rfv->hlen) {
 741		int copy = min(rfv->hlen - offset, len);
 742
 743		if (skb->ip_summed == CHECKSUM_PARTIAL)
 744			memcpy(to, rfv->c + offset, copy);
 745		else
 746			skb->csum = csum_block_add(
 747				skb->csum,
 748				csum_partial_copy_nocheck(rfv->c + offset,
 749							  to, copy, 0),
 750				odd);
 751
 752		odd = 0;
 753		offset += copy;
 754		to += copy;
 755		len -= copy;
 756
 757		if (!len)
 758			return 0;
 759	}
 760
 761	offset -= rfv->hlen;
 762
 763	return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
 764}
 765
 766static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 767{
 768	struct ipv6_txoptions *opt_to_free = NULL;
 769	struct ipv6_txoptions opt_space;
 770	DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
 771	struct in6_addr *daddr, *final_p, final;
 772	struct inet_sock *inet = inet_sk(sk);
 773	struct ipv6_pinfo *np = inet6_sk(sk);
 774	struct raw6_sock *rp = raw6_sk(sk);
 775	struct ipv6_txoptions *opt = NULL;
 776	struct ip6_flowlabel *flowlabel = NULL;
 777	struct dst_entry *dst = NULL;
 778	struct raw6_frag_vec rfv;
 779	struct flowi6 fl6;
 780	struct ipcm6_cookie ipc6;
 781	int addr_len = msg->msg_namelen;
 782	int hdrincl;
 783	u16 proto;
 784	int err;
 785
 786	/* Rough check on arithmetic overflow,
 787	   better check is made in ip6_append_data().
 788	 */
 789	if (len > INT_MAX)
 790		return -EMSGSIZE;
 791
 792	/* Mirror BSD error message compatibility */
 793	if (msg->msg_flags & MSG_OOB)
 794		return -EOPNOTSUPP;
 795
 796	/* hdrincl should be READ_ONCE(inet->hdrincl)
 797	 * but READ_ONCE() doesn't work with bit fields.
 798	 * Doing this indirectly yields the same result.
 799	 */
 800	hdrincl = inet->hdrincl;
 801	hdrincl = READ_ONCE(hdrincl);
 802
 803	/*
 804	 *	Get and verify the address.
 805	 */
 806	memset(&fl6, 0, sizeof(fl6));
 807
 808	fl6.flowi6_mark = sk->sk_mark;
 809	fl6.flowi6_uid = sk->sk_uid;
 810
 811	ipcm6_init(&ipc6);
 812	ipc6.sockc.tsflags = sk->sk_tsflags;
 813	ipc6.sockc.mark = sk->sk_mark;
 814
 815	if (sin6) {
 816		if (addr_len < SIN6_LEN_RFC2133)
 817			return -EINVAL;
 818
 819		if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
 820			return -EAFNOSUPPORT;
 821
 822		/* port is the proto value [0..255] carried in nexthdr */
 823		proto = ntohs(sin6->sin6_port);
 824
 825		if (!proto)
 826			proto = inet->inet_num;
 827		else if (proto != inet->inet_num)
 828			return -EINVAL;
 829
 830		if (proto > 255)
 831			return -EINVAL;
 832
 833		daddr = &sin6->sin6_addr;
 834		if (np->sndflow) {
 835			fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
 836			if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
 837				flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
 838				if (IS_ERR(flowlabel))
 839					return -EINVAL;
 840			}
 841		}
 842
 843		/*
 844		 * Otherwise it will be difficult to maintain
 845		 * sk->sk_dst_cache.
 846		 */
 847		if (sk->sk_state == TCP_ESTABLISHED &&
 848		    ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
 849			daddr = &sk->sk_v6_daddr;
 850
 851		if (addr_len >= sizeof(struct sockaddr_in6) &&
 852		    sin6->sin6_scope_id &&
 853		    __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
 854			fl6.flowi6_oif = sin6->sin6_scope_id;
 855	} else {
 856		if (sk->sk_state != TCP_ESTABLISHED)
 857			return -EDESTADDRREQ;
 858
 859		proto = inet->inet_num;
 860		daddr = &sk->sk_v6_daddr;
 861		fl6.flowlabel = np->flow_label;
 862	}
 863
 864	if (fl6.flowi6_oif == 0)
 865		fl6.flowi6_oif = sk->sk_bound_dev_if;
 866
 867	if (msg->msg_controllen) {
 868		opt = &opt_space;
 869		memset(opt, 0, sizeof(struct ipv6_txoptions));
 870		opt->tot_len = sizeof(struct ipv6_txoptions);
 871		ipc6.opt = opt;
 872
 873		err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
 874		if (err < 0) {
 875			fl6_sock_release(flowlabel);
 876			return err;
 877		}
 878		if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
 879			flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
 880			if (IS_ERR(flowlabel))
 881				return -EINVAL;
 882		}
 883		if (!(opt->opt_nflen|opt->opt_flen))
 884			opt = NULL;
 885	}
 886	if (!opt) {
 887		opt = txopt_get(np);
 888		opt_to_free = opt;
 889	}
 890	if (flowlabel)
 891		opt = fl6_merge_options(&opt_space, flowlabel, opt);
 892	opt = ipv6_fixup_options(&opt_space, opt);
 893
 894	fl6.flowi6_proto = proto;
 895	fl6.flowi6_mark = ipc6.sockc.mark;
 896
 897	if (!hdrincl) {
 898		rfv.msg = msg;
 899		rfv.hlen = 0;
 900		err = rawv6_probe_proto_opt(&rfv, &fl6);
 901		if (err)
 902			goto out;
 903	}
 904
 905	if (!ipv6_addr_any(daddr))
 906		fl6.daddr = *daddr;
 907	else
 908		fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
 909	if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
 910		fl6.saddr = np->saddr;
 911
 912	final_p = fl6_update_dst(&fl6, opt, &final);
 913
 914	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
 915		fl6.flowi6_oif = np->mcast_oif;
 916	else if (!fl6.flowi6_oif)
 917		fl6.flowi6_oif = np->ucast_oif;
 918	security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 919
 920	if (hdrincl)
 921		fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH;
 922
 923	if (ipc6.tclass < 0)
 924		ipc6.tclass = np->tclass;
 925
 926	fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
 927
 928	dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
 929	if (IS_ERR(dst)) {
 930		err = PTR_ERR(dst);
 931		goto out;
 932	}
 933	if (ipc6.hlimit < 0)
 934		ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
 935
 936	if (ipc6.dontfrag < 0)
 937		ipc6.dontfrag = np->dontfrag;
 938
 939	if (msg->msg_flags&MSG_CONFIRM)
 940		goto do_confirm;
 941
 942back_from_confirm:
 943	if (hdrincl)
 944		err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst,
 945					msg->msg_flags, &ipc6.sockc);
 946	else {
 947		ipc6.opt = opt;
 948		lock_sock(sk);
 949		err = ip6_append_data(sk, raw6_getfrag, &rfv,
 950			len, 0, &ipc6, &fl6, (struct rt6_info *)dst,
 951			msg->msg_flags);
 952
 953		if (err)
 954			ip6_flush_pending_frames(sk);
 955		else if (!(msg->msg_flags & MSG_MORE))
 956			err = rawv6_push_pending_frames(sk, &fl6, rp);
 957		release_sock(sk);
 958	}
 959done:
 960	dst_release(dst);
 961out:
 962	fl6_sock_release(flowlabel);
 963	txopt_put(opt_to_free);
 964	return err < 0 ? err : len;
 965do_confirm:
 966	if (msg->msg_flags & MSG_PROBE)
 967		dst_confirm_neigh(dst, &fl6.daddr);
 968	if (!(msg->msg_flags & MSG_PROBE) || len)
 969		goto back_from_confirm;
 970	err = 0;
 971	goto done;
 972}
 973
 974static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
 975			       sockptr_t optval, int optlen)
 976{
 977	switch (optname) {
 978	case ICMPV6_FILTER:
 979		if (optlen > sizeof(struct icmp6_filter))
 980			optlen = sizeof(struct icmp6_filter);
 981		if (copy_from_sockptr(&raw6_sk(sk)->filter, optval, optlen))
 982			return -EFAULT;
 983		return 0;
 984	default:
 985		return -ENOPROTOOPT;
 986	}
 987
 988	return 0;
 989}
 990
 991static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
 992			       char __user *optval, int __user *optlen)
 993{
 994	int len;
 995
 996	switch (optname) {
 997	case ICMPV6_FILTER:
 998		if (get_user(len, optlen))
 999			return -EFAULT;
1000		if (len < 0)
1001			return -EINVAL;
1002		if (len > sizeof(struct icmp6_filter))
1003			len = sizeof(struct icmp6_filter);
1004		if (put_user(len, optlen))
1005			return -EFAULT;
1006		if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
1007			return -EFAULT;
1008		return 0;
1009	default:
1010		return -ENOPROTOOPT;
1011	}
1012
1013	return 0;
1014}
1015
1016
1017static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
1018			       sockptr_t optval, unsigned int optlen)
1019{
1020	struct raw6_sock *rp = raw6_sk(sk);
1021	int val;
1022
 
 
 
1023	if (copy_from_sockptr(&val, optval, sizeof(val)))
1024		return -EFAULT;
1025
1026	switch (optname) {
1027	case IPV6_HDRINCL:
1028		if (sk->sk_type != SOCK_RAW)
1029			return -EINVAL;
1030		inet_sk(sk)->hdrincl = !!val;
1031		return 0;
1032	case IPV6_CHECKSUM:
1033		if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
1034		    level == IPPROTO_IPV6) {
1035			/*
1036			 * RFC3542 tells that IPV6_CHECKSUM socket
1037			 * option in the IPPROTO_IPV6 level is not
1038			 * allowed on ICMPv6 sockets.
1039			 * If you want to set it, use IPPROTO_RAW
1040			 * level IPV6_CHECKSUM socket option
1041			 * (Linux extension).
1042			 */
1043			return -EINVAL;
1044		}
1045
1046		/* You may get strange result with a positive odd offset;
1047		   RFC2292bis agrees with me. */
1048		if (val > 0 && (val&1))
1049			return -EINVAL;
1050		if (val < 0) {
1051			rp->checksum = 0;
1052		} else {
1053			rp->checksum = 1;
1054			rp->offset = val;
1055		}
1056
1057		return 0;
1058
1059	default:
1060		return -ENOPROTOOPT;
1061	}
1062}
1063
1064static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1065			    sockptr_t optval, unsigned int optlen)
1066{
1067	switch (level) {
1068	case SOL_RAW:
1069		break;
1070
1071	case SOL_ICMPV6:
1072		if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1073			return -EOPNOTSUPP;
1074		return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1075	case SOL_IPV6:
1076		if (optname == IPV6_CHECKSUM ||
1077		    optname == IPV6_HDRINCL)
1078			break;
1079		fallthrough;
1080	default:
1081		return ipv6_setsockopt(sk, level, optname, optval, optlen);
1082	}
1083
1084	return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1085}
1086
1087static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1088			    char __user *optval, int __user *optlen)
1089{
1090	struct raw6_sock *rp = raw6_sk(sk);
1091	int val, len;
1092
1093	if (get_user(len, optlen))
1094		return -EFAULT;
1095
1096	switch (optname) {
1097	case IPV6_HDRINCL:
1098		val = inet_sk(sk)->hdrincl;
1099		break;
1100	case IPV6_CHECKSUM:
1101		/*
1102		 * We allow getsockopt() for IPPROTO_IPV6-level
1103		 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1104		 * since RFC3542 is silent about it.
1105		 */
1106		if (rp->checksum == 0)
1107			val = -1;
1108		else
1109			val = rp->offset;
1110		break;
1111
1112	default:
1113		return -ENOPROTOOPT;
1114	}
1115
1116	len = min_t(unsigned int, sizeof(int), len);
1117
1118	if (put_user(len, optlen))
1119		return -EFAULT;
1120	if (copy_to_user(optval, &val, len))
1121		return -EFAULT;
1122	return 0;
1123}
1124
1125static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1126			  char __user *optval, int __user *optlen)
1127{
1128	switch (level) {
1129	case SOL_RAW:
1130		break;
1131
1132	case SOL_ICMPV6:
1133		if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1134			return -EOPNOTSUPP;
1135		return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1136	case SOL_IPV6:
1137		if (optname == IPV6_CHECKSUM ||
1138		    optname == IPV6_HDRINCL)
1139			break;
1140		fallthrough;
1141	default:
1142		return ipv6_getsockopt(sk, level, optname, optval, optlen);
1143	}
1144
1145	return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1146}
1147
1148static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1149{
1150	switch (cmd) {
1151	case SIOCOUTQ: {
1152		int amount = sk_wmem_alloc_get(sk);
1153
1154		return put_user(amount, (int __user *)arg);
1155	}
1156	case SIOCINQ: {
1157		struct sk_buff *skb;
1158		int amount = 0;
1159
1160		spin_lock_bh(&sk->sk_receive_queue.lock);
1161		skb = skb_peek(&sk->sk_receive_queue);
1162		if (skb)
1163			amount = skb->len;
1164		spin_unlock_bh(&sk->sk_receive_queue.lock);
1165		return put_user(amount, (int __user *)arg);
1166	}
1167
1168	default:
1169#ifdef CONFIG_IPV6_MROUTE
1170		return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1171#else
1172		return -ENOIOCTLCMD;
1173#endif
1174	}
1175}
1176
1177#ifdef CONFIG_COMPAT
1178static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1179{
1180	switch (cmd) {
1181	case SIOCOUTQ:
1182	case SIOCINQ:
1183		return -ENOIOCTLCMD;
1184	default:
1185#ifdef CONFIG_IPV6_MROUTE
1186		return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1187#else
1188		return -ENOIOCTLCMD;
1189#endif
1190	}
1191}
1192#endif
1193
1194static void rawv6_close(struct sock *sk, long timeout)
1195{
1196	if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1197		ip6_ra_control(sk, -1);
1198	ip6mr_sk_done(sk);
1199	sk_common_release(sk);
1200}
1201
1202static void raw6_destroy(struct sock *sk)
1203{
1204	lock_sock(sk);
1205	ip6_flush_pending_frames(sk);
1206	release_sock(sk);
1207
1208	inet6_destroy_sock(sk);
1209}
1210
1211static int rawv6_init_sk(struct sock *sk)
1212{
1213	struct raw6_sock *rp = raw6_sk(sk);
1214
1215	switch (inet_sk(sk)->inet_num) {
1216	case IPPROTO_ICMPV6:
1217		rp->checksum = 1;
1218		rp->offset   = 2;
1219		break;
1220	case IPPROTO_MH:
1221		rp->checksum = 1;
1222		rp->offset   = 4;
1223		break;
1224	default:
1225		break;
1226	}
1227	return 0;
1228}
1229
1230struct proto rawv6_prot = {
1231	.name		   = "RAWv6",
1232	.owner		   = THIS_MODULE,
1233	.close		   = rawv6_close,
1234	.destroy	   = raw6_destroy,
1235	.connect	   = ip6_datagram_connect_v6_only,
1236	.disconnect	   = __udp_disconnect,
1237	.ioctl		   = rawv6_ioctl,
1238	.init		   = rawv6_init_sk,
1239	.setsockopt	   = rawv6_setsockopt,
1240	.getsockopt	   = rawv6_getsockopt,
1241	.sendmsg	   = rawv6_sendmsg,
1242	.recvmsg	   = rawv6_recvmsg,
1243	.bind		   = rawv6_bind,
1244	.backlog_rcv	   = rawv6_rcv_skb,
1245	.hash		   = raw_hash_sk,
1246	.unhash		   = raw_unhash_sk,
1247	.obj_size	   = sizeof(struct raw6_sock),
1248	.useroffset	   = offsetof(struct raw6_sock, filter),
1249	.usersize	   = sizeof_field(struct raw6_sock, filter),
1250	.h.raw_hash	   = &raw_v6_hashinfo,
1251#ifdef CONFIG_COMPAT
1252	.compat_ioctl	   = compat_rawv6_ioctl,
1253#endif
1254	.diag_destroy	   = raw_abort,
1255};
1256
1257#ifdef CONFIG_PROC_FS
1258static int raw6_seq_show(struct seq_file *seq, void *v)
1259{
1260	if (v == SEQ_START_TOKEN) {
1261		seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1262	} else {
1263		struct sock *sp = v;
1264		__u16 srcp  = inet_sk(sp)->inet_num;
1265		ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1266					raw_seq_private(seq)->bucket);
1267	}
1268	return 0;
1269}
1270
1271static const struct seq_operations raw6_seq_ops = {
1272	.start =	raw_seq_start,
1273	.next =		raw_seq_next,
1274	.stop =		raw_seq_stop,
1275	.show =		raw6_seq_show,
1276};
1277
1278static int __net_init raw6_init_net(struct net *net)
1279{
1280	if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops,
1281			sizeof(struct raw_iter_state), &raw_v6_hashinfo))
1282		return -ENOMEM;
1283
1284	return 0;
1285}
1286
1287static void __net_exit raw6_exit_net(struct net *net)
1288{
1289	remove_proc_entry("raw6", net->proc_net);
1290}
1291
1292static struct pernet_operations raw6_net_ops = {
1293	.init = raw6_init_net,
1294	.exit = raw6_exit_net,
1295};
1296
1297int __init raw6_proc_init(void)
1298{
1299	return register_pernet_subsys(&raw6_net_ops);
1300}
1301
1302void raw6_proc_exit(void)
1303{
1304	unregister_pernet_subsys(&raw6_net_ops);
1305}
1306#endif	/* CONFIG_PROC_FS */
1307
1308/* Same as inet6_dgram_ops, sans udp_poll.  */
1309const struct proto_ops inet6_sockraw_ops = {
1310	.family		   = PF_INET6,
1311	.owner		   = THIS_MODULE,
1312	.release	   = inet6_release,
1313	.bind		   = inet6_bind,
1314	.connect	   = inet_dgram_connect,	/* ok		*/
1315	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/
1316	.accept		   = sock_no_accept,		/* a do nothing	*/
1317	.getname	   = inet6_getname,
1318	.poll		   = datagram_poll,		/* ok		*/
1319	.ioctl		   = inet6_ioctl,		/* must change  */
1320	.gettstamp	   = sock_gettstamp,
1321	.listen		   = sock_no_listen,		/* ok		*/
1322	.shutdown	   = inet_shutdown,		/* ok		*/
1323	.setsockopt	   = sock_common_setsockopt,	/* ok		*/
1324	.getsockopt	   = sock_common_getsockopt,	/* ok		*/
1325	.sendmsg	   = inet_sendmsg,		/* ok		*/
1326	.recvmsg	   = sock_common_recvmsg,	/* ok		*/
1327	.mmap		   = sock_no_mmap,
1328	.sendpage	   = sock_no_sendpage,
1329#ifdef CONFIG_COMPAT
1330	.compat_ioctl	   = inet6_compat_ioctl,
1331#endif
1332};
1333
1334static struct inet_protosw rawv6_protosw = {
1335	.type		= SOCK_RAW,
1336	.protocol	= IPPROTO_IP,	/* wild card */
1337	.prot		= &rawv6_prot,
1338	.ops		= &inet6_sockraw_ops,
1339	.flags		= INET_PROTOSW_REUSE,
1340};
1341
1342int __init rawv6_init(void)
1343{
1344	return inet6_register_protosw(&rawv6_protosw);
1345}
1346
1347void rawv6_exit(void)
1348{
1349	inet6_unregister_protosw(&rawv6_protosw);
1350}
v6.2
   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *	RAW sockets for IPv6
   4 *	Linux INET6 implementation
   5 *
   6 *	Authors:
   7 *	Pedro Roque		<roque@di.fc.ul.pt>
   8 *
   9 *	Adapted from linux/net/ipv4/raw.c
  10 *
  11 *	Fixes:
  12 *	Hideaki YOSHIFUJI	:	sin6_scope_id support
  13 *	YOSHIFUJI,H.@USAGI	:	raw checksum (RFC2292(bis) compliance)
  14 *	Kazunori MIYAZAWA @USAGI:	change process style to use ip6_append_data
  15 */
  16
  17#include <linux/errno.h>
  18#include <linux/types.h>
  19#include <linux/socket.h>
  20#include <linux/slab.h>
  21#include <linux/sockios.h>
  22#include <linux/net.h>
  23#include <linux/in6.h>
  24#include <linux/netdevice.h>
  25#include <linux/if_arp.h>
  26#include <linux/icmpv6.h>
  27#include <linux/netfilter.h>
  28#include <linux/netfilter_ipv6.h>
  29#include <linux/skbuff.h>
  30#include <linux/compat.h>
  31#include <linux/uaccess.h>
  32#include <asm/ioctls.h>
  33
  34#include <net/net_namespace.h>
  35#include <net/ip.h>
  36#include <net/sock.h>
  37#include <net/snmp.h>
  38
  39#include <net/ipv6.h>
  40#include <net/ndisc.h>
  41#include <net/protocol.h>
  42#include <net/ip6_route.h>
  43#include <net/ip6_checksum.h>
  44#include <net/addrconf.h>
  45#include <net/transp_v6.h>
  46#include <net/udp.h>
  47#include <net/inet_common.h>
  48#include <net/tcp_states.h>
  49#if IS_ENABLED(CONFIG_IPV6_MIP6)
  50#include <net/mip6.h>
  51#endif
  52#include <linux/mroute6.h>
  53
  54#include <net/raw.h>
  55#include <net/rawv6.h>
  56#include <net/xfrm.h>
  57
  58#include <linux/proc_fs.h>
  59#include <linux/seq_file.h>
  60#include <linux/export.h>
  61
  62#define	ICMPV6_HDRLEN	4	/* ICMPv6 header, RFC 4443 Section 2.1 */
  63
  64struct raw_hashinfo raw_v6_hashinfo;
 
 
  65EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
  66
  67bool raw_v6_match(struct net *net, struct sock *sk, unsigned short num,
  68		  const struct in6_addr *loc_addr,
  69		  const struct in6_addr *rmt_addr, int dif, int sdif)
  70{
  71	if (inet_sk(sk)->inet_num != num ||
  72	    !net_eq(sock_net(sk), net) ||
  73	    (!ipv6_addr_any(&sk->sk_v6_daddr) &&
  74	     !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
  75	    !raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
  76				 dif, sdif))
  77		return false;
  78
  79	if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
  80	    ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr) ||
  81	    (ipv6_addr_is_multicast(loc_addr) &&
  82	     inet6_mc_check(sk, loc_addr, rmt_addr)))
  83		return true;
 
 
  84
  85	return false;
 
 
 
 
 
 
 
 
 
 
 
 
  86}
  87EXPORT_SYMBOL_GPL(raw_v6_match);
  88
  89/*
  90 *	0 - deliver
  91 *	1 - block
  92 */
  93static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
  94{
  95	struct icmp6hdr _hdr;
  96	const struct icmp6hdr *hdr;
  97
  98	/* We require only the four bytes of the ICMPv6 header, not any
  99	 * additional bytes of message body in "struct icmp6hdr".
 100	 */
 101	hdr = skb_header_pointer(skb, skb_transport_offset(skb),
 102				 ICMPV6_HDRLEN, &_hdr);
 103	if (hdr) {
 104		const __u32 *data = &raw6_sk(sk)->filter.data[0];
 105		unsigned int type = hdr->icmp6_type;
 106
 107		return (data[type >> 5] & (1U << (type & 31))) != 0;
 108	}
 109	return 1;
 110}
 111
 112#if IS_ENABLED(CONFIG_IPV6_MIP6)
 113typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
 114
 115static mh_filter_t __rcu *mh_filter __read_mostly;
 116
 117int rawv6_mh_filter_register(mh_filter_t filter)
 118{
 119	rcu_assign_pointer(mh_filter, filter);
 120	return 0;
 121}
 122EXPORT_SYMBOL(rawv6_mh_filter_register);
 123
 124int rawv6_mh_filter_unregister(mh_filter_t filter)
 125{
 126	RCU_INIT_POINTER(mh_filter, NULL);
 127	synchronize_rcu();
 128	return 0;
 129}
 130EXPORT_SYMBOL(rawv6_mh_filter_unregister);
 131
 132#endif
 133
 134/*
 135 *	demultiplex raw sockets.
 136 *	(should consider queueing the skb in the sock receive_queue
 137 *	without calling rawv6.c)
 138 *
 139 *	Caller owns SKB so we must make clones.
 140 */
 141static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
 142{
 143	struct net *net = dev_net(skb->dev);
 144	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
 207bool 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 */
 213static 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;
 286out_unlock:
 287	rcu_read_unlock();
 288out:
 289	release_sock(sk);
 290	return err;
 291}
 292
 293static 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
 332void 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
 356static 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 */
 382int 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
 428static 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
 490out_free:
 491	skb_free_datagram(sk, skb);
 492out:
 493	return err;
 494
 495csum_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
 505static 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
 582send:
 583	err = ip6_push_pending_frames(sk);
 584out:
 585	return err;
 586}
 587
 588static 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();
 667out:
 668	return 0;
 669
 670error:
 671	IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
 672error_check:
 673	if (err == -ENOBUFS && !np->recverr)
 674		err = 0;
 675	return err;
 676}
 677
 678struct raw6_frag_vec {
 679	struct msghdr *msg;
 680	int hlen;
 681	char c[4];
 682};
 683
 684static 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
 705static 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
 736static 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
 912back_from_confirm:
 913	if (hdrincl)
 914		err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst,
 915					msg->msg_flags, &ipc6.sockc);
 916	else {
 917		ipc6.opt = opt;
 918		lock_sock(sk);
 919		err = ip6_append_data(sk, raw6_getfrag, &rfv,
 920			len, 0, &ipc6, &fl6, (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	}
 929done:
 930	dst_release(dst);
 931out:
 932	fl6_sock_release(flowlabel);
 933	txopt_put(opt_to_free);
 934	return err < 0 ? err : len;
 935do_confirm:
 936	if (msg->msg_flags & MSG_PROBE)
 937		dst_confirm_neigh(dst, &fl6.daddr);
 938	if (!(msg->msg_flags & MSG_PROBE) || len)
 939		goto back_from_confirm;
 940	err = 0;
 941	goto done;
 942}
 943
 944static int rawv6_seticmpfilter(struct sock *sk, int 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
 961static 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
 987static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
 988			       sockptr_t optval, unsigned int optlen)
 989{
 990	struct raw6_sock *rp = raw6_sk(sk);
 991	int val;
 992
 993	if (optlen < sizeof(val))
 994		return -EINVAL;
 995
 996	if (copy_from_sockptr(&val, optval, sizeof(val)))
 997		return -EFAULT;
 998
 999	switch (optname) {
1000	case IPV6_HDRINCL:
1001		if (sk->sk_type != SOCK_RAW)
1002			return -EINVAL;
1003		inet_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
1037static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1038			    sockptr_t optval, unsigned int optlen)
1039{
1040	switch (level) {
1041	case SOL_RAW:
1042		break;
1043
1044	case SOL_ICMPV6:
1045		if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1046			return -EOPNOTSUPP;
1047		return rawv6_seticmpfilter(sk, 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
1060static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1061			    char __user *optval, int __user *optlen)
1062{
1063	struct raw6_sock *rp = raw6_sk(sk);
1064	int val, len;
1065
1066	if (get_user(len, optlen))
1067		return -EFAULT;
1068
1069	switch (optname) {
1070	case IPV6_HDRINCL:
1071		val = inet_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
1098static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1099			  char __user *optval, int __user *optlen)
1100{
1101	switch (level) {
1102	case SOL_RAW:
1103		break;
1104
1105	case SOL_ICMPV6:
1106		if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1107			return -EOPNOTSUPP;
1108		return rawv6_geticmpfilter(sk, 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
1121static 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
1151static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1152{
1153	switch (cmd) {
1154	case SIOCOUTQ:
1155	case SIOCINQ:
1156		return -ENOIOCTLCMD;
1157	default:
1158#ifdef CONFIG_IPV6_MROUTE
1159		return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1160#else
1161		return -ENOIOCTLCMD;
1162#endif
1163	}
1164}
1165#endif
1166
1167static void rawv6_close(struct sock *sk, long timeout)
1168{
1169	if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1170		ip6_ra_control(sk, -1);
1171	ip6mr_sk_done(sk);
1172	sk_common_release(sk);
1173}
1174
1175static void raw6_destroy(struct sock *sk)
1176{
1177	lock_sock(sk);
1178	ip6_flush_pending_frames(sk);
1179	release_sock(sk);
 
 
1180}
1181
1182static int rawv6_init_sk(struct sock *sk)
1183{
1184	struct raw6_sock *rp = raw6_sk(sk);
1185
1186	switch (inet_sk(sk)->inet_num) {
1187	case IPPROTO_ICMPV6:
1188		rp->checksum = 1;
1189		rp->offset   = 2;
1190		break;
1191	case IPPROTO_MH:
1192		rp->checksum = 1;
1193		rp->offset   = 4;
1194		break;
1195	default:
1196		break;
1197	}
1198	return 0;
1199}
1200
1201struct proto rawv6_prot = {
1202	.name		   = "RAWv6",
1203	.owner		   = THIS_MODULE,
1204	.close		   = rawv6_close,
1205	.destroy	   = raw6_destroy,
1206	.connect	   = ip6_datagram_connect_v6_only,
1207	.disconnect	   = __udp_disconnect,
1208	.ioctl		   = rawv6_ioctl,
1209	.init		   = rawv6_init_sk,
1210	.setsockopt	   = rawv6_setsockopt,
1211	.getsockopt	   = rawv6_getsockopt,
1212	.sendmsg	   = rawv6_sendmsg,
1213	.recvmsg	   = rawv6_recvmsg,
1214	.bind		   = rawv6_bind,
1215	.backlog_rcv	   = rawv6_rcv_skb,
1216	.hash		   = raw_hash_sk,
1217	.unhash		   = raw_unhash_sk,
1218	.obj_size	   = sizeof(struct raw6_sock),
1219	.useroffset	   = offsetof(struct raw6_sock, filter),
1220	.usersize	   = sizeof_field(struct raw6_sock, filter),
1221	.h.raw_hash	   = &raw_v6_hashinfo,
1222#ifdef CONFIG_COMPAT
1223	.compat_ioctl	   = compat_rawv6_ioctl,
1224#endif
1225	.diag_destroy	   = raw_abort,
1226};
1227
1228#ifdef CONFIG_PROC_FS
1229static int raw6_seq_show(struct seq_file *seq, void *v)
1230{
1231	if (v == SEQ_START_TOKEN) {
1232		seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1233	} else {
1234		struct sock *sp = v;
1235		__u16 srcp  = inet_sk(sp)->inet_num;
1236		ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1237					raw_seq_private(seq)->bucket);
1238	}
1239	return 0;
1240}
1241
1242static const struct seq_operations raw6_seq_ops = {
1243	.start =	raw_seq_start,
1244	.next =		raw_seq_next,
1245	.stop =		raw_seq_stop,
1246	.show =		raw6_seq_show,
1247};
1248
1249static int __net_init raw6_init_net(struct net *net)
1250{
1251	if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops,
1252			sizeof(struct raw_iter_state), &raw_v6_hashinfo))
1253		return -ENOMEM;
1254
1255	return 0;
1256}
1257
1258static void __net_exit raw6_exit_net(struct net *net)
1259{
1260	remove_proc_entry("raw6", net->proc_net);
1261}
1262
1263static struct pernet_operations raw6_net_ops = {
1264	.init = raw6_init_net,
1265	.exit = raw6_exit_net,
1266};
1267
1268int __init raw6_proc_init(void)
1269{
1270	return register_pernet_subsys(&raw6_net_ops);
1271}
1272
1273void raw6_proc_exit(void)
1274{
1275	unregister_pernet_subsys(&raw6_net_ops);
1276}
1277#endif	/* CONFIG_PROC_FS */
1278
1279/* Same as inet6_dgram_ops, sans udp_poll.  */
1280const struct proto_ops inet6_sockraw_ops = {
1281	.family		   = PF_INET6,
1282	.owner		   = THIS_MODULE,
1283	.release	   = inet6_release,
1284	.bind		   = inet6_bind,
1285	.connect	   = inet_dgram_connect,	/* ok		*/
1286	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/
1287	.accept		   = sock_no_accept,		/* a do nothing	*/
1288	.getname	   = inet6_getname,
1289	.poll		   = datagram_poll,		/* ok		*/
1290	.ioctl		   = inet6_ioctl,		/* must change  */
1291	.gettstamp	   = sock_gettstamp,
1292	.listen		   = sock_no_listen,		/* ok		*/
1293	.shutdown	   = inet_shutdown,		/* ok		*/
1294	.setsockopt	   = sock_common_setsockopt,	/* ok		*/
1295	.getsockopt	   = sock_common_getsockopt,	/* ok		*/
1296	.sendmsg	   = inet_sendmsg,		/* ok		*/
1297	.recvmsg	   = sock_common_recvmsg,	/* ok		*/
1298	.mmap		   = sock_no_mmap,
1299	.sendpage	   = sock_no_sendpage,
1300#ifdef CONFIG_COMPAT
1301	.compat_ioctl	   = inet6_compat_ioctl,
1302#endif
1303};
1304
1305static struct inet_protosw rawv6_protosw = {
1306	.type		= SOCK_RAW,
1307	.protocol	= IPPROTO_IP,	/* wild card */
1308	.prot		= &rawv6_prot,
1309	.ops		= &inet6_sockraw_ops,
1310	.flags		= INET_PROTOSW_REUSE,
1311};
1312
1313int __init rawv6_init(void)
1314{
1315	return inet6_register_protosw(&rawv6_protosw);
1316}
1317
1318void rawv6_exit(void)
1319{
1320	inet6_unregister_protosw(&rawv6_protosw);
1321}