af_inet6.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *	PF_INET6 socket protocol family
   4 *	Linux INET6 implementation
   5 *
   6 *	Authors:
   7 *	Pedro Roque		<roque@di.fc.ul.pt>
   8 *
   9 *	Adapted from linux/net/ipv4/af_inet.c
  10 *
  11 *	Fixes:
  12 *	piggy, Karl Knutson	:	Socket protocol table
  13 *	Hideaki YOSHIFUJI	:	sin6_scope_id support
  14 *	Arnaldo Melo		:	check proc_net_create return, cleanups
  15 */
  16
  17#define pr_fmt(fmt) "IPv6: " fmt
  18
  19#include <linux/module.h>
  20#include <linux/capability.h>
  21#include <linux/errno.h>
  22#include <linux/types.h>
  23#include <linux/socket.h>
  24#include <linux/in.h>
  25#include <linux/kernel.h>
  26#include <linux/timer.h>
  27#include <linux/string.h>
  28#include <linux/sockios.h>
  29#include <linux/net.h>
  30#include <linux/fcntl.h>
  31#include <linux/mm.h>
  32#include <linux/interrupt.h>
  33#include <linux/proc_fs.h>
  34#include <linux/stat.h>
  35#include <linux/init.h>
  36#include <linux/slab.h>
  37
  38#include <linux/inet.h>
  39#include <linux/netdevice.h>
  40#include <linux/icmpv6.h>
  41#include <linux/netfilter_ipv6.h>
  42
  43#include <net/ip.h>
  44#include <net/ipv6.h>
  45#include <net/udp.h>
  46#include <net/udplite.h>
  47#include <net/tcp.h>
  48#include <net/ping.h>
  49#include <net/protocol.h>
  50#include <net/inet_common.h>
  51#include <net/route.h>
  52#include <net/transp_v6.h>
  53#include <net/ip6_route.h>
  54#include <net/addrconf.h>
  55#include <net/ipv6_stubs.h>
  56#include <net/ndisc.h>
  57#ifdef CONFIG_IPV6_TUNNEL
  58#include <net/ip6_tunnel.h>
  59#endif
  60#include <net/calipso.h>
  61#include <net/seg6.h>
  62#include <net/rpl.h>
  63#include <net/compat.h>
  64#include <net/xfrm.h>
  65#include <net/ioam6.h>
  66#include <net/rawv6.h>
  67#include <net/rps.h>
  68
  69#include <linux/uaccess.h>
  70#include <linux/mroute6.h>
  71
  72#include "ip6_offload.h"
  73
  74MODULE_AUTHOR("Cast of dozens");
  75MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
  76MODULE_LICENSE("GPL");
  77
  78/* The inetsw6 table contains everything that inet6_create needs to
  79 * build a new socket.
  80 */
  81static struct list_head inetsw6[SOCK_MAX];
  82static DEFINE_SPINLOCK(inetsw6_lock);
  83
  84struct ipv6_params ipv6_defaults = {
  85	.disable_ipv6 = 0,
  86	.autoconf = 1,
  87};
  88
  89static int disable_ipv6_mod;
  90
  91module_param_named(disable, disable_ipv6_mod, int, 0444);
  92MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
  93
  94module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
  95MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
  96
  97module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
  98MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
  99
 100bool ipv6_mod_enabled(void)
 101{
 102	return disable_ipv6_mod == 0;
 103}
 104EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
 105
 106static struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 107{
 108	const int offset = sk->sk_prot->ipv6_pinfo_offset;
 109
 110	return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 111}
 112
 113void inet6_sock_destruct(struct sock *sk)
 114{
 115	inet6_cleanup_sock(sk);
 116	inet_sock_destruct(sk);
 117}
 118EXPORT_SYMBOL_GPL(inet6_sock_destruct);
 119
 120static int inet6_create(struct net *net, struct socket *sock, int protocol,
 121			int kern)
 122{
 123	struct inet_sock *inet;
 124	struct ipv6_pinfo *np;
 125	struct sock *sk;
 126	struct inet_protosw *answer;
 127	struct proto *answer_prot;
 128	unsigned char answer_flags;
 129	int try_loading_module = 0;
 130	int err;
 131
 132	if (protocol < 0 || protocol >= IPPROTO_MAX)
 133		return -EINVAL;
 134
 135	/* Look for the requested type/protocol pair. */
 136lookup_protocol:
 137	err = -ESOCKTNOSUPPORT;
 138	rcu_read_lock();
 139	list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
 140
 141		err = 0;
 142		/* Check the non-wild match. */
 143		if (protocol == answer->protocol) {
 144			if (protocol != IPPROTO_IP)
 145				break;
 146		} else {
 147			/* Check for the two wild cases. */
 148			if (IPPROTO_IP == protocol) {
 149				protocol = answer->protocol;
 150				break;
 151			}
 152			if (IPPROTO_IP == answer->protocol)
 153				break;
 154		}
 155		err = -EPROTONOSUPPORT;
 156	}
 157
 158	if (err) {
 159		if (try_loading_module < 2) {
 160			rcu_read_unlock();
 161			/*
 162			 * Be more specific, e.g. net-pf-10-proto-132-type-1
 163			 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
 164			 */
 165			if (++try_loading_module == 1)
 166				request_module("net-pf-%d-proto-%d-type-%d",
 167						PF_INET6, protocol, sock->type);
 168			/*
 169			 * Fall back to generic, e.g. net-pf-10-proto-132
 170			 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
 171			 */
 172			else
 173				request_module("net-pf-%d-proto-%d",
 174						PF_INET6, protocol);
 175			goto lookup_protocol;
 176		} else
 177			goto out_rcu_unlock;
 178	}
 179
 180	err = -EPERM;
 181	if (sock->type == SOCK_RAW && !kern &&
 182	    !ns_capable(net->user_ns, CAP_NET_RAW))
 183		goto out_rcu_unlock;
 184
 185	sock->ops = answer->ops;
 186	answer_prot = answer->prot;
 187	answer_flags = answer->flags;
 188	rcu_read_unlock();
 189
 190	WARN_ON(!answer_prot->slab);
 191
 192	err = -ENOBUFS;
 193	sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
 194	if (!sk)
 195		goto out;
 196
 197	sock_init_data(sock, sk);
 198
 199	err = 0;
 200	if (INET_PROTOSW_REUSE & answer_flags)
 201		sk->sk_reuse = SK_CAN_REUSE;
 202
 203	if (INET_PROTOSW_ICSK & answer_flags)
 204		inet_init_csk_locks(sk);
 205
 206	inet = inet_sk(sk);
 207	inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags);
 208
 209	if (SOCK_RAW == sock->type) {
 210		inet->inet_num = protocol;
 211		if (IPPROTO_RAW == protocol)
 212			inet_set_bit(HDRINCL, sk);
 213	}
 214
 215	sk->sk_destruct		= inet6_sock_destruct;
 216	sk->sk_family		= PF_INET6;
 217	sk->sk_protocol		= protocol;
 218
 219	sk->sk_backlog_rcv	= answer->prot->backlog_rcv;
 220
 221	inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 222	np->hop_limit	= -1;
 223	np->mcast_hops	= IPV6_DEFAULT_MCASTHOPS;
 224	inet6_set_bit(MC6_LOOP, sk);
 225	inet6_set_bit(MC6_ALL, sk);
 226	np->pmtudisc	= IPV6_PMTUDISC_WANT;
 227	inet6_assign_bit(REPFLOW, sk, READ_ONCE(net->ipv6.sysctl.flowlabel_reflect) &
 228				      FLOWLABEL_REFLECT_ESTABLISHED);
 229	sk->sk_ipv6only	= net->ipv6.sysctl.bindv6only;
 230	sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
 231
 232	/* Init the ipv4 part of the socket since we can have sockets
 233	 * using v6 API for ipv4.
 234	 */
 235	inet->uc_ttl	= -1;
 236
 237	inet_set_bit(MC_LOOP, sk);
 238	inet->mc_ttl	= 1;
 239	inet->mc_index	= 0;
 240	RCU_INIT_POINTER(inet->mc_list, NULL);
 241	inet->rcv_tos	= 0;
 242
 243	if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
 244		inet->pmtudisc = IP_PMTUDISC_DONT;
 245	else
 246		inet->pmtudisc = IP_PMTUDISC_WANT;
 247
 248	if (inet->inet_num) {
 249		/* It assumes that any protocol which allows
 250		 * the user to assign a number at socket
 251		 * creation time automatically shares.
 252		 */
 253		inet->inet_sport = htons(inet->inet_num);
 254		err = sk->sk_prot->hash(sk);
 255		if (err)
 256			goto out_sk_release;
 257	}
 258	if (sk->sk_prot->init) {
 259		err = sk->sk_prot->init(sk);
 260		if (err)
 261			goto out_sk_release;
 262	}
 263
 264	if (!kern) {
 265		err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
 266		if (err)
 267			goto out_sk_release;
 268	}
 269out:
 270	return err;
 271out_rcu_unlock:
 272	rcu_read_unlock();
 273	goto out;
 274out_sk_release:
 275	sk_common_release(sk);
 276	sock->sk = NULL;
 277	goto out;
 278}
 279
 280static int __inet6_bind(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len,
 281			u32 flags)
 282{
 283	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
 284	struct inet_sock *inet = inet_sk(sk);
 285	struct ipv6_pinfo *np = inet6_sk(sk);
 286	struct net *net = sock_net(sk);
 287	__be32 v4addr = 0;
 288	unsigned short snum;
 289	bool saved_ipv6only;
 290	int addr_type = 0;
 291	int err = 0;
 292
 293	if (addr->sin6_family != AF_INET6)
 294		return -EAFNOSUPPORT;
 295
 296	addr_type = ipv6_addr_type(&addr->sin6_addr);
 297	if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
 298		return -EINVAL;
 299
 300	snum = ntohs(addr->sin6_port);
 301	if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
 302	    snum && inet_port_requires_bind_service(net, snum) &&
 303	    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
 304		return -EACCES;
 305
 306	if (flags & BIND_WITH_LOCK)
 307		lock_sock(sk);
 308
 309	/* Check these errors (active socket, double bind). */
 310	if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
 311		err = -EINVAL;
 312		goto out;
 313	}
 314
 315	/* Check if the address belongs to the host. */
 316	if (addr_type == IPV6_ADDR_MAPPED) {
 317		struct net_device *dev = NULL;
 318		int chk_addr_ret;
 319
 320		/* Binding to v4-mapped address on a v6-only socket
 321		 * makes no sense
 322		 */
 323		if (ipv6_only_sock(sk)) {
 324			err = -EINVAL;
 325			goto out;
 326		}
 327
 328		rcu_read_lock();
 329		if (sk->sk_bound_dev_if) {
 330			dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 331			if (!dev) {
 332				err = -ENODEV;
 333				goto out_unlock;
 334			}
 335		}
 336
 337		/* Reproduce AF_INET checks to make the bindings consistent */
 338		v4addr = addr->sin6_addr.s6_addr32[3];
 339		chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
 340		rcu_read_unlock();
 341
 342		if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
 343						 chk_addr_ret)) {
 344			err = -EADDRNOTAVAIL;
 345			goto out;
 346		}
 347	} else {
 348		if (addr_type != IPV6_ADDR_ANY) {
 349			struct net_device *dev = NULL;
 350
 351			rcu_read_lock();
 352			if (__ipv6_addr_needs_scope_id(addr_type)) {
 353				if (addr_len >= sizeof(struct sockaddr_in6) &&
 354				    addr->sin6_scope_id) {
 355					/* Override any existing binding, if another one
 356					 * is supplied by user.
 357					 */
 358					sk->sk_bound_dev_if = addr->sin6_scope_id;
 359				}
 360
 361				/* Binding to link-local address requires an interface */
 362				if (!sk->sk_bound_dev_if) {
 363					err = -EINVAL;
 364					goto out_unlock;
 365				}
 366			}
 367
 368			if (sk->sk_bound_dev_if) {
 369				dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
 370				if (!dev) {
 371					err = -ENODEV;
 372					goto out_unlock;
 373				}
 374			}
 375
 376			/* ipv4 addr of the socket is invalid.  Only the
 377			 * unspecified and mapped address have a v4 equivalent.
 378			 */
 379			v4addr = LOOPBACK4_IPV6;
 380			if (!(addr_type & IPV6_ADDR_MULTICAST))	{
 381				if (!ipv6_can_nonlocal_bind(net, inet) &&
 382				    !ipv6_chk_addr(net, &addr->sin6_addr,
 383						   dev, 0)) {
 384					err = -EADDRNOTAVAIL;
 385					goto out_unlock;
 386				}
 387			}
 388			rcu_read_unlock();
 389		}
 390	}
 391
 392	inet->inet_rcv_saddr = v4addr;
 393	inet->inet_saddr = v4addr;
 394
 395	sk->sk_v6_rcv_saddr = addr->sin6_addr;
 396
 397	if (!(addr_type & IPV6_ADDR_MULTICAST))
 398		np->saddr = addr->sin6_addr;
 399
 400	saved_ipv6only = sk->sk_ipv6only;
 401	if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
 402		sk->sk_ipv6only = 1;
 403
 404	/* Make sure we are allowed to bind here. */
 405	if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
 406		      (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
 407		err = sk->sk_prot->get_port(sk, snum);
 408		if (err) {
 409			sk->sk_ipv6only = saved_ipv6only;
 410			inet_reset_saddr(sk);
 411			goto out;
 412		}
 413		if (!(flags & BIND_FROM_BPF)) {
 414			err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
 415			if (err) {
 416				sk->sk_ipv6only = saved_ipv6only;
 417				inet_reset_saddr(sk);
 418				if (sk->sk_prot->put_port)
 419					sk->sk_prot->put_port(sk);
 420				goto out;
 421			}
 422		}
 423	}
 424
 425	if (addr_type != IPV6_ADDR_ANY)
 426		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 427	if (snum)
 428		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 429	inet->inet_sport = htons(inet->inet_num);
 430	inet->inet_dport = 0;
 431	inet->inet_daddr = 0;
 432out:
 433	if (flags & BIND_WITH_LOCK)
 434		release_sock(sk);
 435	return err;
 436out_unlock:
 437	rcu_read_unlock();
 438	goto out;
 439}
 440
 441int inet6_bind_sk(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len)
 442{
 443	u32 flags = BIND_WITH_LOCK;
 444	const struct proto *prot;
 445	int err = 0;
 446
 447	/* IPV6_ADDRFORM can change sk->sk_prot under us. */
 448	prot = READ_ONCE(sk->sk_prot);
 449	/* If the socket has its own bind function then use it. */
 450	if (prot->bind)
 451		return prot->bind(sk, uaddr, addr_len);
 452
 453	if (addr_len < SIN6_LEN_RFC2133)
 454		return -EINVAL;
 455
 456	/* BPF prog is run before any checks are done so that if the prog
 457	 * changes context in a wrong way it will be caught.
 458	 */
 459	err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len,
 460						 CGROUP_INET6_BIND, &flags);
 461	if (err)
 462		return err;
 463
 464	return __inet6_bind(sk, uaddr, addr_len, flags);
 465}
 466
 467/* bind for INET6 API */
 468int inet6_bind(struct socket *sock, struct sockaddr_unsized *uaddr, int addr_len)
 469{
 470	return inet6_bind_sk(sock->sk, uaddr, addr_len);
 471}
 472EXPORT_SYMBOL(inet6_bind);
 473
 474int inet6_release(struct socket *sock)
 475{
 476	struct sock *sk = sock->sk;
 477
 478	if (!sk)
 479		return -EINVAL;
 480
 481	/* Free mc lists */
 482	ipv6_sock_mc_close(sk);
 483
 484	/* Free ac lists */
 485	ipv6_sock_ac_close(sk);
 486
 487	return inet_release(sock);
 488}
 489EXPORT_SYMBOL(inet6_release);
 490
 491void inet6_cleanup_sock(struct sock *sk)
 492{
 493	struct ipv6_pinfo *np = inet6_sk(sk);
 494	struct sk_buff *skb;
 495	struct ipv6_txoptions *opt;
 496
 497	/* Release rx options */
 498
 499	skb = xchg(&np->pktoptions, NULL);
 500	kfree_skb(skb);
 501
 502	skb = xchg(&np->rxpmtu, NULL);
 503	kfree_skb(skb);
 504
 505	/* Free flowlabels */
 506	fl6_free_socklist(sk);
 507
 508	/* Free tx options */
 509
 510	opt = unrcu_pointer(xchg(&np->opt, NULL));
 511	if (opt) {
 512		atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
 513		txopt_put(opt);
 514	}
 515}
 516EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
 517
 518/*
 519 *	This does both peername and sockname.
 520 */
 521int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 522		  int peer)
 523{
 524	struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
 525	int sin_addr_len = sizeof(*sin);
 526	struct sock *sk = sock->sk;
 527	struct inet_sock *inet = inet_sk(sk);
 528	struct ipv6_pinfo *np = inet6_sk(sk);
 529
 530	sin->sin6_family = AF_INET6;
 531	sin->sin6_flowinfo = 0;
 532	sin->sin6_scope_id = 0;
 533	lock_sock(sk);
 534	if (peer) {
 535		if (!inet->inet_dport ||
 536		    (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 537		    peer == 1)) {
 538			release_sock(sk);
 539			return -ENOTCONN;
 540		}
 541		sin->sin6_port = inet->inet_dport;
 542		sin->sin6_addr = sk->sk_v6_daddr;
 543		if (inet6_test_bit(SNDFLOW, sk))
 544			sin->sin6_flowinfo = np->flow_label;
 545		BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
 546				       CGROUP_INET6_GETPEERNAME);
 547	} else {
 548		if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
 549			sin->sin6_addr = np->saddr;
 550		else
 551			sin->sin6_addr = sk->sk_v6_rcv_saddr;
 552		sin->sin6_port = inet->inet_sport;
 553		BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
 554				       CGROUP_INET6_GETSOCKNAME);
 555	}
 556	sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
 557						 sk->sk_bound_dev_if);
 558	release_sock(sk);
 559	return sin_addr_len;
 560}
 561EXPORT_SYMBOL(inet6_getname);
 562
 563int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 564{
 565	void __user *argp = (void __user *)arg;
 566	struct sock *sk = sock->sk;
 567	struct net *net = sock_net(sk);
 568	const struct proto *prot;
 569
 570	switch (cmd) {
 571	case SIOCADDRT:
 572	case SIOCDELRT: {
 573		struct in6_rtmsg rtmsg;
 574
 575		if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
 576			return -EFAULT;
 577		return ipv6_route_ioctl(net, cmd, &rtmsg);
 578	}
 579	case SIOCSIFADDR:
 580		return addrconf_add_ifaddr(net, argp);
 581	case SIOCDIFADDR:
 582		return addrconf_del_ifaddr(net, argp);
 583	case SIOCSIFDSTADDR:
 584		return addrconf_set_dstaddr(net, argp);
 585	default:
 586		/* IPV6_ADDRFORM can change sk->sk_prot under us. */
 587		prot = READ_ONCE(sk->sk_prot);
 588		if (!prot->ioctl)
 589			return -ENOIOCTLCMD;
 590		return sk_ioctl(sk, cmd, (void __user *)arg);
 591	}
 592	/*NOTREACHED*/
 593	return 0;
 594}
 595EXPORT_SYMBOL(inet6_ioctl);
 596
 597#ifdef CONFIG_COMPAT
 598struct compat_in6_rtmsg {
 599	struct in6_addr		rtmsg_dst;
 600	struct in6_addr		rtmsg_src;
 601	struct in6_addr		rtmsg_gateway;
 602	u32			rtmsg_type;
 603	u16			rtmsg_dst_len;
 604	u16			rtmsg_src_len;
 605	u32			rtmsg_metric;
 606	u32			rtmsg_info;
 607	u32			rtmsg_flags;
 608	s32			rtmsg_ifindex;
 609};
 610
 611static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
 612		struct compat_in6_rtmsg __user *ur)
 613{
 614	struct in6_rtmsg rt;
 615
 616	if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
 617			3 * sizeof(struct in6_addr)) ||
 618	    get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
 619	    get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
 620	    get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
 621	    get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
 622	    get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
 623	    get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
 624	    get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
 625		return -EFAULT;
 626
 627
 628	return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
 629}
 630
 631int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 632{
 633	void __user *argp = compat_ptr(arg);
 634	struct sock *sk = sock->sk;
 635
 636	switch (cmd) {
 637	case SIOCADDRT:
 638	case SIOCDELRT:
 639		return inet6_compat_routing_ioctl(sk, cmd, argp);
 640	default:
 641		return -ENOIOCTLCMD;
 642	}
 643}
 644EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
 645#endif /* CONFIG_COMPAT */
 646
 647INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
 648					    size_t));
 649int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
 650{
 651	struct sock *sk = sock->sk;
 652	const struct proto *prot;
 653
 654	if (unlikely(inet_send_prepare(sk)))
 655		return -EAGAIN;
 656
 657	/* IPV6_ADDRFORM can change sk->sk_prot under us. */
 658	prot = READ_ONCE(sk->sk_prot);
 659	return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
 660			       sk, msg, size);
 661}
 662
 663INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
 664					    size_t, int, int *));
 665int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 666		  int flags)
 667{
 668	struct sock *sk = sock->sk;
 669	const struct proto *prot;
 670	int addr_len = 0;
 671	int err;
 672
 673	if (likely(!(flags & MSG_ERRQUEUE)))
 674		sock_rps_record_flow(sk);
 675
 676	/* IPV6_ADDRFORM can change sk->sk_prot under us. */
 677	prot = READ_ONCE(sk->sk_prot);
 678	err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
 679			      sk, msg, size, flags, &addr_len);
 680	if (err >= 0)
 681		msg->msg_namelen = addr_len;
 682	return err;
 683}
 684
 685const struct proto_ops inet6_stream_ops = {
 686	.family		   = PF_INET6,
 687	.owner		   = THIS_MODULE,
 688	.release	   = inet6_release,
 689	.bind		   = inet6_bind,
 690	.connect	   = inet_stream_connect,	/* ok		*/
 691	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/
 692	.accept		   = inet_accept,		/* ok		*/
 693	.getname	   = inet6_getname,
 694	.poll		   = tcp_poll,			/* ok		*/
 695	.ioctl		   = inet6_ioctl,		/* must change  */
 696	.gettstamp	   = sock_gettstamp,
 697	.listen		   = inet_listen,		/* ok		*/
 698	.shutdown	   = inet_shutdown,		/* ok		*/
 699	.setsockopt	   = sock_common_setsockopt,	/* ok		*/
 700	.getsockopt	   = sock_common_getsockopt,	/* ok		*/
 701	.sendmsg	   = inet6_sendmsg,		/* retpoline's sake */
 702	.recvmsg	   = inet6_recvmsg,		/* retpoline's sake */
 703#ifdef CONFIG_MMU
 704	.mmap		   = tcp_mmap,
 705#endif
 706	.splice_eof	   = inet_splice_eof,
 707	.sendmsg_locked    = tcp_sendmsg_locked,
 708	.splice_read	   = tcp_splice_read,
 709	.set_peek_off      = sk_set_peek_off,
 710	.read_sock	   = tcp_read_sock,
 711	.read_skb	   = tcp_read_skb,
 712	.peek_len	   = tcp_peek_len,
 713#ifdef CONFIG_COMPAT
 714	.compat_ioctl	   = inet6_compat_ioctl,
 715#endif
 716	.set_rcvlowat	   = tcp_set_rcvlowat,
 717};
 718EXPORT_SYMBOL_GPL(inet6_stream_ops);
 719
 720const struct proto_ops inet6_dgram_ops = {
 721	.family		   = PF_INET6,
 722	.owner		   = THIS_MODULE,
 723	.release	   = inet6_release,
 724	.bind		   = inet6_bind,
 725	.connect	   = inet_dgram_connect,	/* ok		*/
 726	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/
 727	.accept		   = sock_no_accept,		/* a do nothing	*/
 728	.getname	   = inet6_getname,
 729	.poll		   = udp_poll,			/* ok		*/
 730	.ioctl		   = inet6_ioctl,		/* must change  */
 731	.gettstamp	   = sock_gettstamp,
 732	.listen		   = sock_no_listen,		/* ok		*/
 733	.shutdown	   = inet_shutdown,		/* ok		*/
 734	.setsockopt	   = sock_common_setsockopt,	/* ok		*/
 735	.getsockopt	   = sock_common_getsockopt,	/* ok		*/
 736	.sendmsg	   = inet6_sendmsg,		/* retpoline's sake */
 737	.recvmsg	   = inet6_recvmsg,		/* retpoline's sake */
 738	.read_skb	   = udp_read_skb,
 739	.mmap		   = sock_no_mmap,
 740	.set_peek_off	   = udp_set_peek_off,
 741#ifdef CONFIG_COMPAT
 742	.compat_ioctl	   = inet6_compat_ioctl,
 743#endif
 744};
 745
 746static const struct net_proto_family inet6_family_ops = {
 747	.family = PF_INET6,
 748	.create = inet6_create,
 749	.owner	= THIS_MODULE,
 750};
 751
 752int inet6_register_protosw(struct inet_protosw *p)
 753{
 754	struct list_head *lh;
 755	struct inet_protosw *answer;
 756	struct list_head *last_perm;
 757	int protocol = p->protocol;
 758	int ret;
 759
 760	spin_lock_bh(&inetsw6_lock);
 761
 762	ret = -EINVAL;
 763	if (p->type >= SOCK_MAX)
 764		goto out_illegal;
 765
 766	/* If we are trying to override a permanent protocol, bail. */
 767	answer = NULL;
 768	ret = -EPERM;
 769	last_perm = &inetsw6[p->type];
 770	list_for_each(lh, &inetsw6[p->type]) {
 771		answer = list_entry(lh, struct inet_protosw, list);
 772
 773		/* Check only the non-wild match. */
 774		if (INET_PROTOSW_PERMANENT & answer->flags) {
 775			if (protocol == answer->protocol)
 776				break;
 777			last_perm = lh;
 778		}
 779
 780		answer = NULL;
 781	}
 782	if (answer)
 783		goto out_permanent;
 784
 785	/* Add the new entry after the last permanent entry if any, so that
 786	 * the new entry does not override a permanent entry when matched with
 787	 * a wild-card protocol. But it is allowed to override any existing
 788	 * non-permanent entry.  This means that when we remove this entry, the
 789	 * system automatically returns to the old behavior.
 790	 */
 791	list_add_rcu(&p->list, last_perm);
 792	ret = 0;
 793out:
 794	spin_unlock_bh(&inetsw6_lock);
 795	return ret;
 796
 797out_permanent:
 798	pr_err("Attempt to override permanent protocol %d\n", protocol);
 799	goto out;
 800
 801out_illegal:
 802	pr_err("Ignoring attempt to register invalid socket type %d\n",
 803	       p->type);
 804	goto out;
 805}
 806EXPORT_SYMBOL(inet6_register_protosw);
 807
 808void
 809inet6_unregister_protosw(struct inet_protosw *p)
 810{
 811	if (INET_PROTOSW_PERMANENT & p->flags) {
 812		pr_err("Attempt to unregister permanent protocol %d\n",
 813		       p->protocol);
 814	} else {
 815		spin_lock_bh(&inetsw6_lock);
 816		list_del_rcu(&p->list);
 817		spin_unlock_bh(&inetsw6_lock);
 818
 819		synchronize_net();
 820	}
 821}
 822EXPORT_SYMBOL(inet6_unregister_protosw);
 823
 824int inet6_sk_rebuild_header(struct sock *sk)
 825{
 826	struct ipv6_pinfo *np = inet6_sk(sk);
 827	struct dst_entry *dst;
 828
 829	dst = __sk_dst_check(sk, np->dst_cookie);
 830
 831	if (!dst) {
 832		struct inet_sock *inet = inet_sk(sk);
 833		struct in6_addr *final_p, final;
 834		struct flowi6 fl6;
 835
 836		memset(&fl6, 0, sizeof(fl6));
 837		fl6.flowi6_proto = sk->sk_protocol;
 838		fl6.daddr = sk->sk_v6_daddr;
 839		fl6.saddr = np->saddr;
 840		fl6.flowlabel = np->flow_label;
 841		fl6.flowi6_oif = sk->sk_bound_dev_if;
 842		fl6.flowi6_mark = sk->sk_mark;
 843		fl6.fl6_dport = inet->inet_dport;
 844		fl6.fl6_sport = inet->inet_sport;
 845		fl6.flowi6_uid = sk_uid(sk);
 846		security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
 847
 848		rcu_read_lock();
 849		final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
 850					 &final);
 851		rcu_read_unlock();
 852
 853		dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
 854		if (IS_ERR(dst)) {
 855			sk->sk_route_caps = 0;
 856			WRITE_ONCE(sk->sk_err_soft, -PTR_ERR(dst));
 857			return PTR_ERR(dst);
 858		}
 859
 860		ip6_dst_store(sk, dst, false, false);
 861	}
 862
 863	return 0;
 864}
 865EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
 866
 867bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
 868		       const struct inet6_skb_parm *opt)
 869{
 870	const struct ipv6_pinfo *np = inet6_sk(sk);
 871
 872	if (np->rxopt.all) {
 873		if (((opt->flags & IP6SKB_HOPBYHOP) &&
 874		     (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
 875		    (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
 876		     np->rxopt.bits.rxflow) ||
 877		    (opt->srcrt && (np->rxopt.bits.srcrt ||
 878		     np->rxopt.bits.osrcrt)) ||
 879		    ((opt->dst1 || opt->dst0) &&
 880		     (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
 881			return true;
 882	}
 883	return false;
 884}
 885
 886static struct packet_type ipv6_packet_type __read_mostly = {
 887	.type = cpu_to_be16(ETH_P_IPV6),
 888	.func = ipv6_rcv,
 889	.list_func = ipv6_list_rcv,
 890};
 891
 892static int __init ipv6_packet_init(void)
 893{
 894	dev_add_pack(&ipv6_packet_type);
 895	return 0;
 896}
 897
 898static void ipv6_packet_cleanup(void)
 899{
 900	dev_remove_pack(&ipv6_packet_type);
 901}
 902
 903static int __net_init ipv6_init_mibs(struct net *net)
 904{
 905	int i;
 906
 907	net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
 908	if (!net->mib.udp_stats_in6)
 909		return -ENOMEM;
 910	net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
 911	if (!net->mib.udplite_stats_in6)
 912		goto err_udplite_mib;
 913	net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
 914	if (!net->mib.ipv6_statistics)
 915		goto err_ip_mib;
 916
 917	for_each_possible_cpu(i) {
 918		struct ipstats_mib *af_inet6_stats;
 919		af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
 920		u64_stats_init(&af_inet6_stats->syncp);
 921	}
 922
 923
 924	net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
 925	if (!net->mib.icmpv6_statistics)
 926		goto err_icmp_mib;
 927	net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
 928						GFP_KERNEL);
 929	if (!net->mib.icmpv6msg_statistics)
 930		goto err_icmpmsg_mib;
 931	return 0;
 932
 933err_icmpmsg_mib:
 934	free_percpu(net->mib.icmpv6_statistics);
 935err_icmp_mib:
 936	free_percpu(net->mib.ipv6_statistics);
 937err_ip_mib:
 938	free_percpu(net->mib.udplite_stats_in6);
 939err_udplite_mib:
 940	free_percpu(net->mib.udp_stats_in6);
 941	return -ENOMEM;
 942}
 943
 944static void ipv6_cleanup_mibs(struct net *net)
 945{
 946	free_percpu(net->mib.udp_stats_in6);
 947	free_percpu(net->mib.udplite_stats_in6);
 948	free_percpu(net->mib.ipv6_statistics);
 949	free_percpu(net->mib.icmpv6_statistics);
 950	kfree(net->mib.icmpv6msg_statistics);
 951}
 952
 953static int __net_init inet6_net_init(struct net *net)
 954{
 955	int err = 0;
 956
 957	net->ipv6.sysctl.bindv6only = 0;
 958	net->ipv6.sysctl.icmpv6_time = HZ / 10;
 959	net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
 960	net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
 961	net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
 962	net->ipv6.sysctl.icmpv6_error_anycast_as_unicast = 0;
 963	net->ipv6.sysctl.icmpv6_errors_extension_mask = 0;
 964
 965	/* By default, rate limit error messages.
 966	 * Except for pmtu discovery, it would break it.
 967	 * proc_do_large_bitmap needs pointer to the bitmap.
 968	 */
 969	bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
 970	bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
 971	net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
 972
 973	net->ipv6.sysctl.flowlabel_consistency = 1;
 974	net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
 975	net->ipv6.sysctl.idgen_retries = 3;
 976	net->ipv6.sysctl.idgen_delay = 1 * HZ;
 977	net->ipv6.sysctl.flowlabel_state_ranges = 0;
 978	net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
 979	net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
 980	net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
 981	net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
 982	net->ipv6.sysctl.fib_notify_on_flag_change = 0;
 983	atomic_set(&net->ipv6.fib6_sernum, 1);
 984
 985	net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID;
 986	net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE;
 987
 988	err = ipv6_init_mibs(net);
 989	if (err)
 990		return err;
 991#ifdef CONFIG_PROC_FS
 992	err = udp6_proc_init(net);
 993	if (err)
 994		goto out;
 995	err = tcp6_proc_init(net);
 996	if (err)
 997		goto proc_tcp6_fail;
 998	err = ac6_proc_init(net);
 999	if (err)
1000		goto proc_ac6_fail;
1001#endif
1002	return err;
1003
1004#ifdef CONFIG_PROC_FS
1005proc_ac6_fail:
1006	tcp6_proc_exit(net);
1007proc_tcp6_fail:
1008	udp6_proc_exit(net);
1009out:
1010	ipv6_cleanup_mibs(net);
1011	return err;
1012#endif
1013}
1014
1015static void __net_exit inet6_net_exit(struct net *net)
1016{
1017#ifdef CONFIG_PROC_FS
1018	udp6_proc_exit(net);
1019	tcp6_proc_exit(net);
1020	ac6_proc_exit(net);
1021#endif
1022	ipv6_cleanup_mibs(net);
1023}
1024
1025static struct pernet_operations inet6_net_ops = {
1026	.init = inet6_net_init,
1027	.exit = inet6_net_exit,
1028};
1029
1030static int ipv6_route_input(struct sk_buff *skb)
1031{
1032	ip6_route_input(skb);
1033	return skb_dst(skb)->error;
1034}
1035
1036static const struct ipv6_stub ipv6_stub_impl = {
1037	.ipv6_sock_mc_join = ipv6_sock_mc_join,
1038	.ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1039	.ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1040	.ipv6_route_input  = ipv6_route_input,
1041	.fib6_get_table	   = fib6_get_table,
1042	.fib6_table_lookup = fib6_table_lookup,
1043	.fib6_lookup       = fib6_lookup,
1044	.fib6_select_path  = fib6_select_path,
1045	.ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1046	.fib6_nh_init	   = fib6_nh_init,
1047	.fib6_nh_release   = fib6_nh_release,
1048	.fib6_nh_release_dsts = fib6_nh_release_dsts,
1049	.fib6_update_sernum = fib6_update_sernum_stub,
1050	.fib6_rt_update	   = fib6_rt_update,
1051	.ip6_del_rt	   = ip6_del_rt,
1052	.udpv6_encap_enable = udpv6_encap_enable,
1053	.ndisc_send_na = ndisc_send_na,
1054#if IS_ENABLED(CONFIG_XFRM)
1055	.xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1056	.xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1057	.xfrm6_gro_udp_encap_rcv = xfrm6_gro_udp_encap_rcv,
1058	.xfrm6_rcv_encap = xfrm6_rcv_encap,
1059#endif
1060	.nd_tbl	= &nd_tbl,
1061	.ipv6_fragment = ip6_fragment,
1062	.ipv6_dev_find = ipv6_dev_find,
1063	.ip6_xmit = ip6_xmit,
1064};
1065
1066static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1067	.inet6_bind = __inet6_bind,
1068	.udp6_lib_lookup = __udp6_lib_lookup,
1069	.ipv6_setsockopt = do_ipv6_setsockopt,
1070	.ipv6_getsockopt = do_ipv6_getsockopt,
1071	.ipv6_dev_get_saddr = ipv6_dev_get_saddr,
1072};
1073
1074static int __init inet6_init(void)
1075{
1076	struct list_head *r;
1077	int err = 0;
1078
1079	sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1080
1081	/* Register the socket-side information for inet6_create.  */
1082	for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1083		INIT_LIST_HEAD(r);
1084
1085	raw_hashinfo_init(&raw_v6_hashinfo);
1086
1087	if (disable_ipv6_mod) {
1088		pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1089		goto out;
1090	}
1091
1092	err = proto_register(&tcpv6_prot, 1);
1093	if (err)
1094		goto out;
1095
1096	err = proto_register(&udpv6_prot, 1);
1097	if (err)
1098		goto out_unregister_tcp_proto;
1099
1100	err = proto_register(&udplitev6_prot, 1);
1101	if (err)
1102		goto out_unregister_udp_proto;
1103
1104	err = proto_register(&rawv6_prot, 1);
1105	if (err)
1106		goto out_unregister_udplite_proto;
1107
1108	err = proto_register(&pingv6_prot, 1);
1109	if (err)
1110		goto out_unregister_raw_proto;
1111
1112	/* We MUST register RAW sockets before we create the ICMP6,
1113	 * IGMP6, or NDISC control sockets.
1114	 */
1115	err = rawv6_init();
1116	if (err)
1117		goto out_unregister_ping_proto;
1118
1119	/* Register the family here so that the init calls below will
1120	 * be able to create sockets. (?? is this dangerous ??)
1121	 */
1122	err = sock_register(&inet6_family_ops);
1123	if (err)
1124		goto out_sock_register_fail;
1125
1126	/*
1127	 *	ipngwg API draft makes clear that the correct semantics
1128	 *	for TCP and UDP is to consider one TCP and UDP instance
1129	 *	in a host available by both INET and INET6 APIs and
1130	 *	able to communicate via both network protocols.
1131	 */
1132
1133	err = register_pernet_subsys(&inet6_net_ops);
1134	if (err)
1135		goto register_pernet_fail;
1136	err = ip6_mr_init();
1137	if (err)
1138		goto ipmr_fail;
1139	err = icmpv6_init();
1140	if (err)
1141		goto icmp_fail;
1142	err = ndisc_init();
1143	if (err)
1144		goto ndisc_fail;
1145	err = igmp6_init();
1146	if (err)
1147		goto igmp_fail;
1148
1149	err = ipv6_netfilter_init();
1150	if (err)
1151		goto netfilter_fail;
1152	/* Create /proc/foo6 entries. */
1153#ifdef CONFIG_PROC_FS
1154	err = -ENOMEM;
1155	if (raw6_proc_init())
1156		goto proc_raw6_fail;
1157	if (udplite6_proc_init())
1158		goto proc_udplite6_fail;
1159	if (ipv6_misc_proc_init())
1160		goto proc_misc6_fail;
1161	if (if6_proc_init())
1162		goto proc_if6_fail;
1163#endif
1164	err = ip6_route_init();
1165	if (err)
1166		goto ip6_route_fail;
1167	err = ndisc_late_init();
1168	if (err)
1169		goto ndisc_late_fail;
1170	err = ip6_flowlabel_init();
1171	if (err)
1172		goto ip6_flowlabel_fail;
1173	err = ipv6_anycast_init();
1174	if (err)
1175		goto ipv6_anycast_fail;
1176	err = addrconf_init();
1177	if (err)
1178		goto addrconf_fail;
1179
1180	/* Init v6 extension headers. */
1181	err = ipv6_exthdrs_init();
1182	if (err)
1183		goto ipv6_exthdrs_fail;
1184
1185	err = ipv6_frag_init();
1186	if (err)
1187		goto ipv6_frag_fail;
1188
1189	/* Init v6 transport protocols. */
1190	err = udpv6_init();
1191	if (err)
1192		goto udpv6_fail;
1193
1194	err = udplitev6_init();
1195	if (err)
1196		goto udplitev6_fail;
1197
1198	err = udpv6_offload_init();
1199	if (err)
1200		goto udpv6_offload_fail;
1201
1202	err = tcpv6_init();
1203	if (err)
1204		goto tcpv6_fail;
1205
1206	err = ipv6_packet_init();
1207	if (err)
1208		goto ipv6_packet_fail;
1209
1210	err = pingv6_init();
1211	if (err)
1212		goto pingv6_fail;
1213
1214	err = calipso_init();
1215	if (err)
1216		goto calipso_fail;
1217
1218	err = seg6_init();
1219	if (err)
1220		goto seg6_fail;
1221
1222	err = rpl_init();
1223	if (err)
1224		goto rpl_fail;
1225
1226	err = ioam6_init();
1227	if (err)
1228		goto ioam6_fail;
1229
1230	err = igmp6_late_init();
1231	if (err)
1232		goto igmp6_late_err;
1233
1234#ifdef CONFIG_SYSCTL
1235	err = ipv6_sysctl_register();
1236	if (err)
1237		goto sysctl_fail;
1238#endif
1239
1240	/* ensure that ipv6 stubs are visible only after ipv6 is ready */
1241	wmb();
1242	ipv6_stub = &ipv6_stub_impl;
1243	ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1244out:
1245	return err;
1246
1247#ifdef CONFIG_SYSCTL
1248sysctl_fail:
1249	igmp6_late_cleanup();
1250#endif
1251igmp6_late_err:
1252	ioam6_exit();
1253ioam6_fail:
1254	rpl_exit();
1255rpl_fail:
1256	seg6_exit();
1257seg6_fail:
1258	calipso_exit();
1259calipso_fail:
1260	pingv6_exit();
1261pingv6_fail:
1262	ipv6_packet_cleanup();
1263ipv6_packet_fail:
1264	tcpv6_exit();
1265tcpv6_fail:
1266	udpv6_offload_exit();
1267udpv6_offload_fail:
1268	udplitev6_exit();
1269udplitev6_fail:
1270	udpv6_exit();
1271udpv6_fail:
1272	ipv6_frag_exit();
1273ipv6_frag_fail:
1274	ipv6_exthdrs_exit();
1275ipv6_exthdrs_fail:
1276	addrconf_cleanup();
1277addrconf_fail:
1278	ipv6_anycast_cleanup();
1279ipv6_anycast_fail:
1280	ip6_flowlabel_cleanup();
1281ip6_flowlabel_fail:
1282	ndisc_late_cleanup();
1283ndisc_late_fail:
1284	ip6_route_cleanup();
1285ip6_route_fail:
1286#ifdef CONFIG_PROC_FS
1287	if6_proc_exit();
1288proc_if6_fail:
1289	ipv6_misc_proc_exit();
1290proc_misc6_fail:
1291	udplite6_proc_exit();
1292proc_udplite6_fail:
1293	raw6_proc_exit();
1294proc_raw6_fail:
1295#endif
1296	ipv6_netfilter_fini();
1297netfilter_fail:
1298	igmp6_cleanup();
1299igmp_fail:
1300	ndisc_cleanup();
1301ndisc_fail:
1302	icmpv6_cleanup();
1303icmp_fail:
1304	ip6_mr_cleanup();
1305ipmr_fail:
1306	unregister_pernet_subsys(&inet6_net_ops);
1307register_pernet_fail:
1308	sock_unregister(PF_INET6);
1309	rtnl_unregister_all(PF_INET6);
1310out_sock_register_fail:
1311	rawv6_exit();
1312out_unregister_ping_proto:
1313	proto_unregister(&pingv6_prot);
1314out_unregister_raw_proto:
1315	proto_unregister(&rawv6_prot);
1316out_unregister_udplite_proto:
1317	proto_unregister(&udplitev6_prot);
1318out_unregister_udp_proto:
1319	proto_unregister(&udpv6_prot);
1320out_unregister_tcp_proto:
1321	proto_unregister(&tcpv6_prot);
1322	goto out;
1323}
1324module_init(inet6_init);
1325
1326MODULE_ALIAS_NETPROTO(PF_INET6);