xref: /openbmc/linux/net/ipv6/af_inet6.c (revision a13144e2)
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 
68 #include <linux/uaccess.h>
69 #include <linux/mroute6.h>
70 
71 #include "ip6_offload.h"
72 
73 MODULE_AUTHOR("Cast of dozens");
74 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
75 MODULE_LICENSE("GPL");
76 
77 /* The inetsw6 table contains everything that inet6_create needs to
78  * build a new socket.
79  */
80 static struct list_head inetsw6[SOCK_MAX];
81 static DEFINE_SPINLOCK(inetsw6_lock);
82 
83 struct ipv6_params ipv6_defaults = {
84 	.disable_ipv6 = 0,
85 	.autoconf = 1,
86 };
87 
88 static int disable_ipv6_mod;
89 
90 module_param_named(disable, disable_ipv6_mod, int, 0444);
91 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
92 
93 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
94 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
95 
96 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
97 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
98 
99 bool ipv6_mod_enabled(void)
100 {
101 	return disable_ipv6_mod == 0;
102 }
103 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
104 
105 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
106 {
107 	const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
108 
109 	return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
110 }
111 
112 void inet6_sock_destruct(struct sock *sk)
113 {
114 	inet6_cleanup_sock(sk);
115 	inet_sock_destruct(sk);
116 }
117 EXPORT_SYMBOL_GPL(inet6_sock_destruct);
118 
119 static int inet6_create(struct net *net, struct socket *sock, int protocol,
120 			int kern)
121 {
122 	struct inet_sock *inet;
123 	struct ipv6_pinfo *np;
124 	struct sock *sk;
125 	struct inet_protosw *answer;
126 	struct proto *answer_prot;
127 	unsigned char answer_flags;
128 	int try_loading_module = 0;
129 	int err;
130 
131 	if (protocol < 0 || protocol >= IPPROTO_MAX)
132 		return -EINVAL;
133 
134 	/* Look for the requested type/protocol pair. */
135 lookup_protocol:
136 	err = -ESOCKTNOSUPPORT;
137 	rcu_read_lock();
138 	list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
139 
140 		err = 0;
141 		/* Check the non-wild match. */
142 		if (protocol == answer->protocol) {
143 			if (protocol != IPPROTO_IP)
144 				break;
145 		} else {
146 			/* Check for the two wild cases. */
147 			if (IPPROTO_IP == protocol) {
148 				protocol = answer->protocol;
149 				break;
150 			}
151 			if (IPPROTO_IP == answer->protocol)
152 				break;
153 		}
154 		err = -EPROTONOSUPPORT;
155 	}
156 
157 	if (err) {
158 		if (try_loading_module < 2) {
159 			rcu_read_unlock();
160 			/*
161 			 * Be more specific, e.g. net-pf-10-proto-132-type-1
162 			 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
163 			 */
164 			if (++try_loading_module == 1)
165 				request_module("net-pf-%d-proto-%d-type-%d",
166 						PF_INET6, protocol, sock->type);
167 			/*
168 			 * Fall back to generic, e.g. net-pf-10-proto-132
169 			 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
170 			 */
171 			else
172 				request_module("net-pf-%d-proto-%d",
173 						PF_INET6, protocol);
174 			goto lookup_protocol;
175 		} else
176 			goto out_rcu_unlock;
177 	}
178 
179 	err = -EPERM;
180 	if (sock->type == SOCK_RAW && !kern &&
181 	    !ns_capable(net->user_ns, CAP_NET_RAW))
182 		goto out_rcu_unlock;
183 
184 	sock->ops = answer->ops;
185 	answer_prot = answer->prot;
186 	answer_flags = answer->flags;
187 	rcu_read_unlock();
188 
189 	WARN_ON(!answer_prot->slab);
190 
191 	err = -ENOBUFS;
192 	sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
193 	if (!sk)
194 		goto out;
195 
196 	sock_init_data(sock, sk);
197 
198 	err = 0;
199 	if (INET_PROTOSW_REUSE & answer_flags)
200 		sk->sk_reuse = SK_CAN_REUSE;
201 
202 	inet = inet_sk(sk);
203 	inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
204 
205 	if (SOCK_RAW == sock->type) {
206 		inet->inet_num = protocol;
207 		if (IPPROTO_RAW == protocol)
208 			inet->hdrincl = 1;
209 	}
210 
211 	sk->sk_destruct		= inet6_sock_destruct;
212 	sk->sk_family		= PF_INET6;
213 	sk->sk_protocol		= protocol;
214 
215 	sk->sk_backlog_rcv	= answer->prot->backlog_rcv;
216 
217 	inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
218 	np->hop_limit	= -1;
219 	np->mcast_hops	= IPV6_DEFAULT_MCASTHOPS;
220 	np->mc_loop	= 1;
221 	np->mc_all	= 1;
222 	np->pmtudisc	= IPV6_PMTUDISC_WANT;
223 	np->repflow	= net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
224 	sk->sk_ipv6only	= net->ipv6.sysctl.bindv6only;
225 
226 	/* Init the ipv4 part of the socket since we can have sockets
227 	 * using v6 API for ipv4.
228 	 */
229 	inet->uc_ttl	= -1;
230 
231 	inet->mc_loop	= 1;
232 	inet->mc_ttl	= 1;
233 	inet->mc_index	= 0;
234 	RCU_INIT_POINTER(inet->mc_list, NULL);
235 	inet->rcv_tos	= 0;
236 
237 	if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
238 		inet->pmtudisc = IP_PMTUDISC_DONT;
239 	else
240 		inet->pmtudisc = IP_PMTUDISC_WANT;
241 	/*
242 	 * Increment only the relevant sk_prot->socks debug field, this changes
243 	 * the previous behaviour of incrementing both the equivalent to
244 	 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
245 	 *
246 	 * This allows better debug granularity as we'll know exactly how many
247 	 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
248 	 * transport protocol socks. -acme
249 	 */
250 	sk_refcnt_debug_inc(sk);
251 
252 	if (inet->inet_num) {
253 		/* It assumes that any protocol which allows
254 		 * the user to assign a number at socket
255 		 * creation time automatically shares.
256 		 */
257 		inet->inet_sport = htons(inet->inet_num);
258 		err = sk->sk_prot->hash(sk);
259 		if (err) {
260 			sk_common_release(sk);
261 			goto out;
262 		}
263 	}
264 	if (sk->sk_prot->init) {
265 		err = sk->sk_prot->init(sk);
266 		if (err) {
267 			sk_common_release(sk);
268 			goto out;
269 		}
270 	}
271 
272 	if (!kern) {
273 		err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
274 		if (err) {
275 			sk_common_release(sk);
276 			goto out;
277 		}
278 	}
279 out:
280 	return err;
281 out_rcu_unlock:
282 	rcu_read_unlock();
283 	goto out;
284 }
285 
286 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
287 			u32 flags)
288 {
289 	struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
290 	struct inet_sock *inet = inet_sk(sk);
291 	struct ipv6_pinfo *np = inet6_sk(sk);
292 	struct net *net = sock_net(sk);
293 	__be32 v4addr = 0;
294 	unsigned short snum;
295 	bool saved_ipv6only;
296 	int addr_type = 0;
297 	int err = 0;
298 
299 	if (addr->sin6_family != AF_INET6)
300 		return -EAFNOSUPPORT;
301 
302 	addr_type = ipv6_addr_type(&addr->sin6_addr);
303 	if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
304 		return -EINVAL;
305 
306 	snum = ntohs(addr->sin6_port);
307 	if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
308 	    snum && inet_port_requires_bind_service(net, snum) &&
309 	    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
310 		return -EACCES;
311 
312 	if (flags & BIND_WITH_LOCK)
313 		lock_sock(sk);
314 
315 	/* Check these errors (active socket, double bind). */
316 	if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
317 		err = -EINVAL;
318 		goto out;
319 	}
320 
321 	/* Check if the address belongs to the host. */
322 	if (addr_type == IPV6_ADDR_MAPPED) {
323 		struct net_device *dev = NULL;
324 		int chk_addr_ret;
325 
326 		/* Binding to v4-mapped address on a v6-only socket
327 		 * makes no sense
328 		 */
329 		if (ipv6_only_sock(sk)) {
330 			err = -EINVAL;
331 			goto out;
332 		}
333 
334 		rcu_read_lock();
335 		if (sk->sk_bound_dev_if) {
336 			dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
337 			if (!dev) {
338 				err = -ENODEV;
339 				goto out_unlock;
340 			}
341 		}
342 
343 		/* Reproduce AF_INET checks to make the bindings consistent */
344 		v4addr = addr->sin6_addr.s6_addr32[3];
345 		chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
346 		rcu_read_unlock();
347 
348 		if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
349 						 chk_addr_ret)) {
350 			err = -EADDRNOTAVAIL;
351 			goto out;
352 		}
353 	} else {
354 		if (addr_type != IPV6_ADDR_ANY) {
355 			struct net_device *dev = NULL;
356 
357 			rcu_read_lock();
358 			if (__ipv6_addr_needs_scope_id(addr_type)) {
359 				if (addr_len >= sizeof(struct sockaddr_in6) &&
360 				    addr->sin6_scope_id) {
361 					/* Override any existing binding, if another one
362 					 * is supplied by user.
363 					 */
364 					sk->sk_bound_dev_if = addr->sin6_scope_id;
365 				}
366 
367 				/* Binding to link-local address requires an interface */
368 				if (!sk->sk_bound_dev_if) {
369 					err = -EINVAL;
370 					goto out_unlock;
371 				}
372 			}
373 
374 			if (sk->sk_bound_dev_if) {
375 				dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
376 				if (!dev) {
377 					err = -ENODEV;
378 					goto out_unlock;
379 				}
380 			}
381 
382 			/* ipv4 addr of the socket is invalid.  Only the
383 			 * unspecified and mapped address have a v4 equivalent.
384 			 */
385 			v4addr = LOOPBACK4_IPV6;
386 			if (!(addr_type & IPV6_ADDR_MULTICAST))	{
387 				if (!ipv6_can_nonlocal_bind(net, inet) &&
388 				    !ipv6_chk_addr(net, &addr->sin6_addr,
389 						   dev, 0)) {
390 					err = -EADDRNOTAVAIL;
391 					goto out_unlock;
392 				}
393 			}
394 			rcu_read_unlock();
395 		}
396 	}
397 
398 	inet->inet_rcv_saddr = v4addr;
399 	inet->inet_saddr = v4addr;
400 
401 	sk->sk_v6_rcv_saddr = addr->sin6_addr;
402 
403 	if (!(addr_type & IPV6_ADDR_MULTICAST))
404 		np->saddr = addr->sin6_addr;
405 
406 	saved_ipv6only = sk->sk_ipv6only;
407 	if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
408 		sk->sk_ipv6only = 1;
409 
410 	/* Make sure we are allowed to bind here. */
411 	if (snum || !(inet->bind_address_no_port ||
412 		      (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
413 		err = sk->sk_prot->get_port(sk, snum);
414 		if (err) {
415 			sk->sk_ipv6only = saved_ipv6only;
416 			inet_reset_saddr(sk);
417 			goto out;
418 		}
419 		if (!(flags & BIND_FROM_BPF)) {
420 			err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
421 			if (err) {
422 				sk->sk_ipv6only = saved_ipv6only;
423 				inet_reset_saddr(sk);
424 				if (sk->sk_prot->put_port)
425 					sk->sk_prot->put_port(sk);
426 				goto out;
427 			}
428 		}
429 	}
430 
431 	if (addr_type != IPV6_ADDR_ANY)
432 		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
433 	if (snum)
434 		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
435 	inet->inet_sport = htons(inet->inet_num);
436 	inet->inet_dport = 0;
437 	inet->inet_daddr = 0;
438 out:
439 	if (flags & BIND_WITH_LOCK)
440 		release_sock(sk);
441 	return err;
442 out_unlock:
443 	rcu_read_unlock();
444 	goto out;
445 }
446 
447 /* bind for INET6 API */
448 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
449 {
450 	struct sock *sk = sock->sk;
451 	u32 flags = BIND_WITH_LOCK;
452 	const struct proto *prot;
453 	int err = 0;
454 
455 	/* IPV6_ADDRFORM can change sk->sk_prot under us. */
456 	prot = READ_ONCE(sk->sk_prot);
457 	/* If the socket has its own bind function then use it. */
458 	if (prot->bind)
459 		return prot->bind(sk, uaddr, addr_len);
460 
461 	if (addr_len < SIN6_LEN_RFC2133)
462 		return -EINVAL;
463 
464 	/* BPF prog is run before any checks are done so that if the prog
465 	 * changes context in a wrong way it will be caught.
466 	 */
467 	err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr,
468 						 CGROUP_INET6_BIND, &flags);
469 	if (err)
470 		return err;
471 
472 	return __inet6_bind(sk, uaddr, addr_len, flags);
473 }
474 EXPORT_SYMBOL(inet6_bind);
475 
476 int inet6_release(struct socket *sock)
477 {
478 	struct sock *sk = sock->sk;
479 
480 	if (!sk)
481 		return -EINVAL;
482 
483 	/* Free mc lists */
484 	ipv6_sock_mc_close(sk);
485 
486 	/* Free ac lists */
487 	ipv6_sock_ac_close(sk);
488 
489 	return inet_release(sock);
490 }
491 EXPORT_SYMBOL(inet6_release);
492 
493 void inet6_cleanup_sock(struct sock *sk)
494 {
495 	struct ipv6_pinfo *np = inet6_sk(sk);
496 	struct sk_buff *skb;
497 	struct ipv6_txoptions *opt;
498 
499 	/* Release rx options */
500 
501 	skb = xchg(&np->pktoptions, NULL);
502 	kfree_skb(skb);
503 
504 	skb = xchg(&np->rxpmtu, NULL);
505 	kfree_skb(skb);
506 
507 	/* Free flowlabels */
508 	fl6_free_socklist(sk);
509 
510 	/* Free tx options */
511 
512 	opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
513 	if (opt) {
514 		atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
515 		txopt_put(opt);
516 	}
517 }
518 EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
519 
520 /*
521  *	This does both peername and sockname.
522  */
523 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
524 		  int peer)
525 {
526 	struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
527 	struct sock *sk = sock->sk;
528 	struct inet_sock *inet = inet_sk(sk);
529 	struct ipv6_pinfo *np = inet6_sk(sk);
530 
531 	sin->sin6_family = AF_INET6;
532 	sin->sin6_flowinfo = 0;
533 	sin->sin6_scope_id = 0;
534 	lock_sock(sk);
535 	if (peer) {
536 		if (!inet->inet_dport ||
537 		    (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
538 		    peer == 1)) {
539 			release_sock(sk);
540 			return -ENOTCONN;
541 		}
542 		sin->sin6_port = inet->inet_dport;
543 		sin->sin6_addr = sk->sk_v6_daddr;
544 		if (np->sndflow)
545 			sin->sin6_flowinfo = np->flow_label;
546 		BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
547 				       CGROUP_INET6_GETPEERNAME);
548 	} else {
549 		if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
550 			sin->sin6_addr = np->saddr;
551 		else
552 			sin->sin6_addr = sk->sk_v6_rcv_saddr;
553 		sin->sin6_port = inet->inet_sport;
554 		BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
555 				       CGROUP_INET6_GETSOCKNAME);
556 	}
557 	sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
558 						 sk->sk_bound_dev_if);
559 	release_sock(sk);
560 	return sizeof(*sin);
561 }
562 EXPORT_SYMBOL(inet6_getname);
563 
564 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
565 {
566 	void __user *argp = (void __user *)arg;
567 	struct sock *sk = sock->sk;
568 	struct net *net = sock_net(sk);
569 	const struct proto *prot;
570 
571 	switch (cmd) {
572 	case SIOCADDRT:
573 	case SIOCDELRT: {
574 		struct in6_rtmsg rtmsg;
575 
576 		if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
577 			return -EFAULT;
578 		return ipv6_route_ioctl(net, cmd, &rtmsg);
579 	}
580 	case SIOCSIFADDR:
581 		return addrconf_add_ifaddr(net, argp);
582 	case SIOCDIFADDR:
583 		return addrconf_del_ifaddr(net, argp);
584 	case SIOCSIFDSTADDR:
585 		return addrconf_set_dstaddr(net, argp);
586 	default:
587 		/* IPV6_ADDRFORM can change sk->sk_prot under us. */
588 		prot = READ_ONCE(sk->sk_prot);
589 		if (!prot->ioctl)
590 			return -ENOIOCTLCMD;
591 		return prot->ioctl(sk, cmd, arg);
592 	}
593 	/*NOTREACHED*/
594 	return 0;
595 }
596 EXPORT_SYMBOL(inet6_ioctl);
597 
598 #ifdef CONFIG_COMPAT
599 struct compat_in6_rtmsg {
600 	struct in6_addr		rtmsg_dst;
601 	struct in6_addr		rtmsg_src;
602 	struct in6_addr		rtmsg_gateway;
603 	u32			rtmsg_type;
604 	u16			rtmsg_dst_len;
605 	u16			rtmsg_src_len;
606 	u32			rtmsg_metric;
607 	u32			rtmsg_info;
608 	u32			rtmsg_flags;
609 	s32			rtmsg_ifindex;
610 };
611 
612 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
613 		struct compat_in6_rtmsg __user *ur)
614 {
615 	struct in6_rtmsg rt;
616 
617 	if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
618 			3 * sizeof(struct in6_addr)) ||
619 	    get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
620 	    get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
621 	    get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
622 	    get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
623 	    get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
624 	    get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
625 	    get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
626 		return -EFAULT;
627 
628 
629 	return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
630 }
631 
632 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
633 {
634 	void __user *argp = compat_ptr(arg);
635 	struct sock *sk = sock->sk;
636 
637 	switch (cmd) {
638 	case SIOCADDRT:
639 	case SIOCDELRT:
640 		return inet6_compat_routing_ioctl(sk, cmd, argp);
641 	default:
642 		return -ENOIOCTLCMD;
643 	}
644 }
645 EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
646 #endif /* CONFIG_COMPAT */
647 
648 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
649 					    size_t));
650 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
651 {
652 	struct sock *sk = sock->sk;
653 	const struct proto *prot;
654 
655 	if (unlikely(inet_send_prepare(sk)))
656 		return -EAGAIN;
657 
658 	/* IPV6_ADDRFORM can change sk->sk_prot under us. */
659 	prot = READ_ONCE(sk->sk_prot);
660 	return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
661 			       sk, msg, size);
662 }
663 
664 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
665 					    size_t, int, int *));
666 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
667 		  int flags)
668 {
669 	struct sock *sk = sock->sk;
670 	const struct proto *prot;
671 	int addr_len = 0;
672 	int err;
673 
674 	if (likely(!(flags & MSG_ERRQUEUE)))
675 		sock_rps_record_flow(sk);
676 
677 	/* IPV6_ADDRFORM can change sk->sk_prot under us. */
678 	prot = READ_ONCE(sk->sk_prot);
679 	err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
680 			      sk, msg, size, flags, &addr_len);
681 	if (err >= 0)
682 		msg->msg_namelen = addr_len;
683 	return err;
684 }
685 
686 const struct proto_ops inet6_stream_ops = {
687 	.family		   = PF_INET6,
688 	.owner		   = THIS_MODULE,
689 	.release	   = inet6_release,
690 	.bind		   = inet6_bind,
691 	.connect	   = inet_stream_connect,	/* ok		*/
692 	.socketpair	   = sock_no_socketpair,	/* a do nothing	*/
693 	.accept		   = inet_accept,		/* ok		*/
694 	.getname	   = inet6_getname,
695 	.poll		   = tcp_poll,			/* ok		*/
696 	.ioctl		   = inet6_ioctl,		/* must change  */
697 	.gettstamp	   = sock_gettstamp,
698 	.listen		   = inet_listen,		/* ok		*/
699 	.shutdown	   = inet_shutdown,		/* ok		*/
700 	.setsockopt	   = sock_common_setsockopt,	/* ok		*/
701 	.getsockopt	   = sock_common_getsockopt,	/* ok		*/
702 	.sendmsg	   = inet6_sendmsg,		/* retpoline's sake */
703 	.recvmsg	   = inet6_recvmsg,		/* retpoline's sake */
704 #ifdef CONFIG_MMU
705 	.mmap		   = tcp_mmap,
706 #endif
707 	.sendpage	   = inet_sendpage,
708 	.sendmsg_locked    = tcp_sendmsg_locked,
709 	.sendpage_locked   = tcp_sendpage_locked,
710 	.splice_read	   = tcp_splice_read,
711 	.read_sock	   = tcp_read_sock,
712 	.read_skb	   = tcp_read_skb,
713 	.peek_len	   = tcp_peek_len,
714 #ifdef CONFIG_COMPAT
715 	.compat_ioctl	   = inet6_compat_ioctl,
716 #endif
717 	.set_rcvlowat	   = tcp_set_rcvlowat,
718 };
719 
720 const 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 	.sendpage	   = sock_no_sendpage,
741 	.set_peek_off	   = sk_set_peek_off,
742 #ifdef CONFIG_COMPAT
743 	.compat_ioctl	   = inet6_compat_ioctl,
744 #endif
745 };
746 
747 static const struct net_proto_family inet6_family_ops = {
748 	.family = PF_INET6,
749 	.create = inet6_create,
750 	.owner	= THIS_MODULE,
751 };
752 
753 int inet6_register_protosw(struct inet_protosw *p)
754 {
755 	struct list_head *lh;
756 	struct inet_protosw *answer;
757 	struct list_head *last_perm;
758 	int protocol = p->protocol;
759 	int ret;
760 
761 	spin_lock_bh(&inetsw6_lock);
762 
763 	ret = -EINVAL;
764 	if (p->type >= SOCK_MAX)
765 		goto out_illegal;
766 
767 	/* If we are trying to override a permanent protocol, bail. */
768 	answer = NULL;
769 	ret = -EPERM;
770 	last_perm = &inetsw6[p->type];
771 	list_for_each(lh, &inetsw6[p->type]) {
772 		answer = list_entry(lh, struct inet_protosw, list);
773 
774 		/* Check only the non-wild match. */
775 		if (INET_PROTOSW_PERMANENT & answer->flags) {
776 			if (protocol == answer->protocol)
777 				break;
778 			last_perm = lh;
779 		}
780 
781 		answer = NULL;
782 	}
783 	if (answer)
784 		goto out_permanent;
785 
786 	/* Add the new entry after the last permanent entry if any, so that
787 	 * the new entry does not override a permanent entry when matched with
788 	 * a wild-card protocol. But it is allowed to override any existing
789 	 * non-permanent entry.  This means that when we remove this entry, the
790 	 * system automatically returns to the old behavior.
791 	 */
792 	list_add_rcu(&p->list, last_perm);
793 	ret = 0;
794 out:
795 	spin_unlock_bh(&inetsw6_lock);
796 	return ret;
797 
798 out_permanent:
799 	pr_err("Attempt to override permanent protocol %d\n", protocol);
800 	goto out;
801 
802 out_illegal:
803 	pr_err("Ignoring attempt to register invalid socket type %d\n",
804 	       p->type);
805 	goto out;
806 }
807 EXPORT_SYMBOL(inet6_register_protosw);
808 
809 void
810 inet6_unregister_protosw(struct inet_protosw *p)
811 {
812 	if (INET_PROTOSW_PERMANENT & p->flags) {
813 		pr_err("Attempt to unregister permanent protocol %d\n",
814 		       p->protocol);
815 	} else {
816 		spin_lock_bh(&inetsw6_lock);
817 		list_del_rcu(&p->list);
818 		spin_unlock_bh(&inetsw6_lock);
819 
820 		synchronize_net();
821 	}
822 }
823 EXPORT_SYMBOL(inet6_unregister_protosw);
824 
825 int inet6_sk_rebuild_header(struct sock *sk)
826 {
827 	struct ipv6_pinfo *np = inet6_sk(sk);
828 	struct dst_entry *dst;
829 
830 	dst = __sk_dst_check(sk, np->dst_cookie);
831 
832 	if (!dst) {
833 		struct inet_sock *inet = inet_sk(sk);
834 		struct in6_addr *final_p, final;
835 		struct flowi6 fl6;
836 
837 		memset(&fl6, 0, sizeof(fl6));
838 		fl6.flowi6_proto = sk->sk_protocol;
839 		fl6.daddr = sk->sk_v6_daddr;
840 		fl6.saddr = np->saddr;
841 		fl6.flowlabel = np->flow_label;
842 		fl6.flowi6_oif = sk->sk_bound_dev_if;
843 		fl6.flowi6_mark = sk->sk_mark;
844 		fl6.fl6_dport = inet->inet_dport;
845 		fl6.fl6_sport = inet->inet_sport;
846 		fl6.flowi6_uid = sk->sk_uid;
847 		security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
848 
849 		rcu_read_lock();
850 		final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
851 					 &final);
852 		rcu_read_unlock();
853 
854 		dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
855 		if (IS_ERR(dst)) {
856 			sk->sk_route_caps = 0;
857 			sk->sk_err_soft = -PTR_ERR(dst);
858 			return PTR_ERR(dst);
859 		}
860 
861 		ip6_dst_store(sk, dst, NULL, NULL);
862 	}
863 
864 	return 0;
865 }
866 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
867 
868 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
869 		       const struct inet6_skb_parm *opt)
870 {
871 	const struct ipv6_pinfo *np = inet6_sk(sk);
872 
873 	if (np->rxopt.all) {
874 		if (((opt->flags & IP6SKB_HOPBYHOP) &&
875 		     (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
876 		    (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
877 		     np->rxopt.bits.rxflow) ||
878 		    (opt->srcrt && (np->rxopt.bits.srcrt ||
879 		     np->rxopt.bits.osrcrt)) ||
880 		    ((opt->dst1 || opt->dst0) &&
881 		     (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
882 			return true;
883 	}
884 	return false;
885 }
886 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
887 
888 static struct packet_type ipv6_packet_type __read_mostly = {
889 	.type = cpu_to_be16(ETH_P_IPV6),
890 	.func = ipv6_rcv,
891 	.list_func = ipv6_list_rcv,
892 };
893 
894 static int __init ipv6_packet_init(void)
895 {
896 	dev_add_pack(&ipv6_packet_type);
897 	return 0;
898 }
899 
900 static void ipv6_packet_cleanup(void)
901 {
902 	dev_remove_pack(&ipv6_packet_type);
903 }
904 
905 static int __net_init ipv6_init_mibs(struct net *net)
906 {
907 	int i;
908 
909 	net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
910 	if (!net->mib.udp_stats_in6)
911 		return -ENOMEM;
912 	net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
913 	if (!net->mib.udplite_stats_in6)
914 		goto err_udplite_mib;
915 	net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
916 	if (!net->mib.ipv6_statistics)
917 		goto err_ip_mib;
918 
919 	for_each_possible_cpu(i) {
920 		struct ipstats_mib *af_inet6_stats;
921 		af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
922 		u64_stats_init(&af_inet6_stats->syncp);
923 	}
924 
925 
926 	net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
927 	if (!net->mib.icmpv6_statistics)
928 		goto err_icmp_mib;
929 	net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
930 						GFP_KERNEL);
931 	if (!net->mib.icmpv6msg_statistics)
932 		goto err_icmpmsg_mib;
933 	return 0;
934 
935 err_icmpmsg_mib:
936 	free_percpu(net->mib.icmpv6_statistics);
937 err_icmp_mib:
938 	free_percpu(net->mib.ipv6_statistics);
939 err_ip_mib:
940 	free_percpu(net->mib.udplite_stats_in6);
941 err_udplite_mib:
942 	free_percpu(net->mib.udp_stats_in6);
943 	return -ENOMEM;
944 }
945 
946 static void ipv6_cleanup_mibs(struct net *net)
947 {
948 	free_percpu(net->mib.udp_stats_in6);
949 	free_percpu(net->mib.udplite_stats_in6);
950 	free_percpu(net->mib.ipv6_statistics);
951 	free_percpu(net->mib.icmpv6_statistics);
952 	kfree(net->mib.icmpv6msg_statistics);
953 }
954 
955 static int __net_init inet6_net_init(struct net *net)
956 {
957 	int err = 0;
958 
959 	net->ipv6.sysctl.bindv6only = 0;
960 	net->ipv6.sysctl.icmpv6_time = 1*HZ;
961 	net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
962 	net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
963 	net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 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
1005 proc_ac6_fail:
1006 	tcp6_proc_exit(net);
1007 proc_tcp6_fail:
1008 	udp6_proc_exit(net);
1009 out:
1010 	ipv6_cleanup_mibs(net);
1011 	return err;
1012 #endif
1013 }
1014 
1015 static 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 
1025 static struct pernet_operations inet6_net_ops = {
1026 	.init = inet6_net_init,
1027 	.exit = inet6_net_exit,
1028 };
1029 
1030 static int ipv6_route_input(struct sk_buff *skb)
1031 {
1032 	ip6_route_input(skb);
1033 	return skb_dst(skb)->error;
1034 }
1035 
1036 static 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_rcv_encap = xfrm6_rcv_encap,
1058 #endif
1059 	.nd_tbl	= &nd_tbl,
1060 	.ipv6_fragment = ip6_fragment,
1061 	.ipv6_dev_find = ipv6_dev_find,
1062 };
1063 
1064 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1065 	.inet6_bind = __inet6_bind,
1066 	.udp6_lib_lookup = __udp6_lib_lookup,
1067 	.ipv6_setsockopt = do_ipv6_setsockopt,
1068 	.ipv6_getsockopt = do_ipv6_getsockopt,
1069 };
1070 
1071 static int __init inet6_init(void)
1072 {
1073 	struct list_head *r;
1074 	int err = 0;
1075 
1076 	sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1077 
1078 	/* Register the socket-side information for inet6_create.  */
1079 	for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1080 		INIT_LIST_HEAD(r);
1081 
1082 	raw_hashinfo_init(&raw_v6_hashinfo);
1083 
1084 	if (disable_ipv6_mod) {
1085 		pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1086 		goto out;
1087 	}
1088 
1089 	err = proto_register(&tcpv6_prot, 1);
1090 	if (err)
1091 		goto out;
1092 
1093 	err = proto_register(&udpv6_prot, 1);
1094 	if (err)
1095 		goto out_unregister_tcp_proto;
1096 
1097 	err = proto_register(&udplitev6_prot, 1);
1098 	if (err)
1099 		goto out_unregister_udp_proto;
1100 
1101 	err = proto_register(&rawv6_prot, 1);
1102 	if (err)
1103 		goto out_unregister_udplite_proto;
1104 
1105 	err = proto_register(&pingv6_prot, 1);
1106 	if (err)
1107 		goto out_unregister_raw_proto;
1108 
1109 	/* We MUST register RAW sockets before we create the ICMP6,
1110 	 * IGMP6, or NDISC control sockets.
1111 	 */
1112 	err = rawv6_init();
1113 	if (err)
1114 		goto out_unregister_ping_proto;
1115 
1116 	/* Register the family here so that the init calls below will
1117 	 * be able to create sockets. (?? is this dangerous ??)
1118 	 */
1119 	err = sock_register(&inet6_family_ops);
1120 	if (err)
1121 		goto out_sock_register_fail;
1122 
1123 	/*
1124 	 *	ipngwg API draft makes clear that the correct semantics
1125 	 *	for TCP and UDP is to consider one TCP and UDP instance
1126 	 *	in a host available by both INET and INET6 APIs and
1127 	 *	able to communicate via both network protocols.
1128 	 */
1129 
1130 	err = register_pernet_subsys(&inet6_net_ops);
1131 	if (err)
1132 		goto register_pernet_fail;
1133 	err = ip6_mr_init();
1134 	if (err)
1135 		goto ipmr_fail;
1136 	err = icmpv6_init();
1137 	if (err)
1138 		goto icmp_fail;
1139 	err = ndisc_init();
1140 	if (err)
1141 		goto ndisc_fail;
1142 	err = igmp6_init();
1143 	if (err)
1144 		goto igmp_fail;
1145 
1146 	err = ipv6_netfilter_init();
1147 	if (err)
1148 		goto netfilter_fail;
1149 	/* Create /proc/foo6 entries. */
1150 #ifdef CONFIG_PROC_FS
1151 	err = -ENOMEM;
1152 	if (raw6_proc_init())
1153 		goto proc_raw6_fail;
1154 	if (udplite6_proc_init())
1155 		goto proc_udplite6_fail;
1156 	if (ipv6_misc_proc_init())
1157 		goto proc_misc6_fail;
1158 	if (if6_proc_init())
1159 		goto proc_if6_fail;
1160 #endif
1161 	err = ip6_route_init();
1162 	if (err)
1163 		goto ip6_route_fail;
1164 	err = ndisc_late_init();
1165 	if (err)
1166 		goto ndisc_late_fail;
1167 	err = ip6_flowlabel_init();
1168 	if (err)
1169 		goto ip6_flowlabel_fail;
1170 	err = ipv6_anycast_init();
1171 	if (err)
1172 		goto ipv6_anycast_fail;
1173 	err = addrconf_init();
1174 	if (err)
1175 		goto addrconf_fail;
1176 
1177 	/* Init v6 extension headers. */
1178 	err = ipv6_exthdrs_init();
1179 	if (err)
1180 		goto ipv6_exthdrs_fail;
1181 
1182 	err = ipv6_frag_init();
1183 	if (err)
1184 		goto ipv6_frag_fail;
1185 
1186 	/* Init v6 transport protocols. */
1187 	err = udpv6_init();
1188 	if (err)
1189 		goto udpv6_fail;
1190 
1191 	err = udplitev6_init();
1192 	if (err)
1193 		goto udplitev6_fail;
1194 
1195 	err = udpv6_offload_init();
1196 	if (err)
1197 		goto udpv6_offload_fail;
1198 
1199 	err = tcpv6_init();
1200 	if (err)
1201 		goto tcpv6_fail;
1202 
1203 	err = ipv6_packet_init();
1204 	if (err)
1205 		goto ipv6_packet_fail;
1206 
1207 	err = pingv6_init();
1208 	if (err)
1209 		goto pingv6_fail;
1210 
1211 	err = calipso_init();
1212 	if (err)
1213 		goto calipso_fail;
1214 
1215 	err = seg6_init();
1216 	if (err)
1217 		goto seg6_fail;
1218 
1219 	err = rpl_init();
1220 	if (err)
1221 		goto rpl_fail;
1222 
1223 	err = ioam6_init();
1224 	if (err)
1225 		goto ioam6_fail;
1226 
1227 	err = igmp6_late_init();
1228 	if (err)
1229 		goto igmp6_late_err;
1230 
1231 #ifdef CONFIG_SYSCTL
1232 	err = ipv6_sysctl_register();
1233 	if (err)
1234 		goto sysctl_fail;
1235 #endif
1236 
1237 	/* ensure that ipv6 stubs are visible only after ipv6 is ready */
1238 	wmb();
1239 	ipv6_stub = &ipv6_stub_impl;
1240 	ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1241 out:
1242 	return err;
1243 
1244 #ifdef CONFIG_SYSCTL
1245 sysctl_fail:
1246 	igmp6_late_cleanup();
1247 #endif
1248 igmp6_late_err:
1249 	ioam6_exit();
1250 ioam6_fail:
1251 	rpl_exit();
1252 rpl_fail:
1253 	seg6_exit();
1254 seg6_fail:
1255 	calipso_exit();
1256 calipso_fail:
1257 	pingv6_exit();
1258 pingv6_fail:
1259 	ipv6_packet_cleanup();
1260 ipv6_packet_fail:
1261 	tcpv6_exit();
1262 tcpv6_fail:
1263 	udpv6_offload_exit();
1264 udpv6_offload_fail:
1265 	udplitev6_exit();
1266 udplitev6_fail:
1267 	udpv6_exit();
1268 udpv6_fail:
1269 	ipv6_frag_exit();
1270 ipv6_frag_fail:
1271 	ipv6_exthdrs_exit();
1272 ipv6_exthdrs_fail:
1273 	addrconf_cleanup();
1274 addrconf_fail:
1275 	ipv6_anycast_cleanup();
1276 ipv6_anycast_fail:
1277 	ip6_flowlabel_cleanup();
1278 ip6_flowlabel_fail:
1279 	ndisc_late_cleanup();
1280 ndisc_late_fail:
1281 	ip6_route_cleanup();
1282 ip6_route_fail:
1283 #ifdef CONFIG_PROC_FS
1284 	if6_proc_exit();
1285 proc_if6_fail:
1286 	ipv6_misc_proc_exit();
1287 proc_misc6_fail:
1288 	udplite6_proc_exit();
1289 proc_udplite6_fail:
1290 	raw6_proc_exit();
1291 proc_raw6_fail:
1292 #endif
1293 	ipv6_netfilter_fini();
1294 netfilter_fail:
1295 	igmp6_cleanup();
1296 igmp_fail:
1297 	ndisc_cleanup();
1298 ndisc_fail:
1299 	icmpv6_cleanup();
1300 icmp_fail:
1301 	ip6_mr_cleanup();
1302 ipmr_fail:
1303 	unregister_pernet_subsys(&inet6_net_ops);
1304 register_pernet_fail:
1305 	sock_unregister(PF_INET6);
1306 	rtnl_unregister_all(PF_INET6);
1307 out_sock_register_fail:
1308 	rawv6_exit();
1309 out_unregister_ping_proto:
1310 	proto_unregister(&pingv6_prot);
1311 out_unregister_raw_proto:
1312 	proto_unregister(&rawv6_prot);
1313 out_unregister_udplite_proto:
1314 	proto_unregister(&udplitev6_prot);
1315 out_unregister_udp_proto:
1316 	proto_unregister(&udpv6_prot);
1317 out_unregister_tcp_proto:
1318 	proto_unregister(&tcpv6_prot);
1319 	goto out;
1320 }
1321 module_init(inet6_init);
1322 
1323 MODULE_ALIAS_NETPROTO(PF_INET6);
1324