1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * PF_INET6 socket protocol family
4 * Linux INET6 implementation
7 * Pedro Roque <roque@di.fc.ul.pt>
9 * Adapted from linux/net/ipv4/af_inet.c
12 * piggy, Karl Knutson : Socket protocol table
13 * Hideaki YOSHIFUJI : sin6_scope_id support
14 * Arnaldo Melo : check proc_net_create return, cleanups
17 #define pr_fmt(fmt) "IPv6: " fmt
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>
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>
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>
38 #include <linux/inet.h>
39 #include <linux/netdevice.h>
40 #include <linux/icmpv6.h>
41 #include <linux/netfilter_ipv6.h>
46 #include <net/udplite.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>
60 #include <net/calipso.h>
63 #include <net/compat.h>
65 #include <net/ioam6.h>
66 #include <net/rawv6.h>
68 #include <linux/uaccess.h>
69 #include <linux/mroute6.h>
71 #include "ip6_offload.h"
73 MODULE_AUTHOR("Cast of dozens");
74 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
75 MODULE_LICENSE("GPL");
77 /* The inetsw6 table contains everything that inet6_create needs to
80 static struct list_head inetsw6[SOCK_MAX];
81 static DEFINE_SPINLOCK(inetsw6_lock);
83 struct ipv6_params ipv6_defaults = {
88 static int disable_ipv6_mod;
90 module_param_named(disable, disable_ipv6_mod, int, 0444);
91 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
93 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
94 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
96 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
97 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
99 bool ipv6_mod_enabled(void)
101 return disable_ipv6_mod == 0;
103 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
105 static struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
107 const int offset = sk->sk_prot->ipv6_pinfo_offset;
109 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
112 void inet6_sock_destruct(struct sock *sk)
114 inet6_cleanup_sock(sk);
115 inet_sock_destruct(sk);
117 EXPORT_SYMBOL_GPL(inet6_sock_destruct);
119 static int inet6_create(struct net *net, struct socket *sock, int protocol,
122 struct inet_sock *inet;
123 struct ipv6_pinfo *np;
125 struct inet_protosw *answer;
126 struct proto *answer_prot;
127 unsigned char answer_flags;
128 int try_loading_module = 0;
131 if (protocol < 0 || protocol >= IPPROTO_MAX)
134 /* Look for the requested type/protocol pair. */
136 err = -ESOCKTNOSUPPORT;
138 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
141 /* Check the non-wild match. */
142 if (protocol == answer->protocol) {
143 if (protocol != IPPROTO_IP)
146 /* Check for the two wild cases. */
147 if (IPPROTO_IP == protocol) {
148 protocol = answer->protocol;
151 if (IPPROTO_IP == answer->protocol)
154 err = -EPROTONOSUPPORT;
158 if (try_loading_module < 2) {
161 * Be more specific, e.g. net-pf-10-proto-132-type-1
162 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
164 if (++try_loading_module == 1)
165 request_module("net-pf-%d-proto-%d-type-%d",
166 PF_INET6, protocol, sock->type);
168 * Fall back to generic, e.g. net-pf-10-proto-132
169 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
172 request_module("net-pf-%d-proto-%d",
174 goto lookup_protocol;
180 if (sock->type == SOCK_RAW && !kern &&
181 !ns_capable(net->user_ns, CAP_NET_RAW))
184 sock->ops = answer->ops;
185 answer_prot = answer->prot;
186 answer_flags = answer->flags;
189 WARN_ON(!answer_prot->slab);
192 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
196 sock_init_data(sock, sk);
199 if (INET_PROTOSW_REUSE & answer_flags)
200 sk->sk_reuse = SK_CAN_REUSE;
202 if (INET_PROTOSW_ICSK & answer_flags)
203 inet_init_csk_locks(sk);
206 inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags);
208 if (SOCK_RAW == sock->type) {
209 inet->inet_num = protocol;
210 if (IPPROTO_RAW == protocol)
211 inet_set_bit(HDRINCL, sk);
214 sk->sk_destruct = inet6_sock_destruct;
215 sk->sk_family = PF_INET6;
216 sk->sk_protocol = protocol;
218 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
220 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
222 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
223 inet6_set_bit(MC6_LOOP, sk);
224 inet6_set_bit(MC6_ALL, sk);
225 np->pmtudisc = IPV6_PMTUDISC_WANT;
226 inet6_assign_bit(REPFLOW, sk, net->ipv6.sysctl.flowlabel_reflect &
227 FLOWLABEL_REFLECT_ESTABLISHED);
228 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
229 sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
231 /* Init the ipv4 part of the socket since we can have sockets
232 * using v6 API for ipv4.
236 inet_set_bit(MC_LOOP, sk);
239 RCU_INIT_POINTER(inet->mc_list, NULL);
242 if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
243 inet->pmtudisc = IP_PMTUDISC_DONT;
245 inet->pmtudisc = IP_PMTUDISC_WANT;
247 if (inet->inet_num) {
248 /* It assumes that any protocol which allows
249 * the user to assign a number at socket
250 * creation time automatically shares.
252 inet->inet_sport = htons(inet->inet_num);
253 err = sk->sk_prot->hash(sk);
255 sk_common_release(sk);
259 if (sk->sk_prot->init) {
260 err = sk->sk_prot->init(sk);
262 sk_common_release(sk);
268 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
270 sk_common_release(sk);
281 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
284 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
285 struct inet_sock *inet = inet_sk(sk);
286 struct ipv6_pinfo *np = inet6_sk(sk);
287 struct net *net = sock_net(sk);
294 if (addr->sin6_family != AF_INET6)
295 return -EAFNOSUPPORT;
297 addr_type = ipv6_addr_type(&addr->sin6_addr);
298 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
301 snum = ntohs(addr->sin6_port);
302 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
303 snum && inet_port_requires_bind_service(net, snum) &&
304 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
307 if (flags & BIND_WITH_LOCK)
310 /* Check these errors (active socket, double bind). */
311 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
316 /* Check if the address belongs to the host. */
317 if (addr_type == IPV6_ADDR_MAPPED) {
318 struct net_device *dev = NULL;
321 /* Binding to v4-mapped address on a v6-only socket
324 if (ipv6_only_sock(sk)) {
330 if (sk->sk_bound_dev_if) {
331 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
338 /* Reproduce AF_INET checks to make the bindings consistent */
339 v4addr = addr->sin6_addr.s6_addr32[3];
340 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
343 if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
345 err = -EADDRNOTAVAIL;
349 if (addr_type != IPV6_ADDR_ANY) {
350 struct net_device *dev = NULL;
353 if (__ipv6_addr_needs_scope_id(addr_type)) {
354 if (addr_len >= sizeof(struct sockaddr_in6) &&
355 addr->sin6_scope_id) {
356 /* Override any existing binding, if another one
357 * is supplied by user.
359 sk->sk_bound_dev_if = addr->sin6_scope_id;
362 /* Binding to link-local address requires an interface */
363 if (!sk->sk_bound_dev_if) {
369 if (sk->sk_bound_dev_if) {
370 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
377 /* ipv4 addr of the socket is invalid. Only the
378 * unspecified and mapped address have a v4 equivalent.
380 v4addr = LOOPBACK4_IPV6;
381 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
382 if (!ipv6_can_nonlocal_bind(net, inet) &&
383 !ipv6_chk_addr(net, &addr->sin6_addr,
385 err = -EADDRNOTAVAIL;
393 inet->inet_rcv_saddr = v4addr;
394 inet->inet_saddr = v4addr;
396 sk->sk_v6_rcv_saddr = addr->sin6_addr;
398 if (!(addr_type & IPV6_ADDR_MULTICAST))
399 np->saddr = addr->sin6_addr;
401 saved_ipv6only = sk->sk_ipv6only;
402 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
405 /* Make sure we are allowed to bind here. */
406 if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
407 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
408 err = sk->sk_prot->get_port(sk, snum);
410 sk->sk_ipv6only = saved_ipv6only;
411 inet_reset_saddr(sk);
414 if (!(flags & BIND_FROM_BPF)) {
415 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
417 sk->sk_ipv6only = saved_ipv6only;
418 inet_reset_saddr(sk);
419 if (sk->sk_prot->put_port)
420 sk->sk_prot->put_port(sk);
426 if (addr_type != IPV6_ADDR_ANY)
427 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
429 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
430 inet->inet_sport = htons(inet->inet_num);
431 inet->inet_dport = 0;
432 inet->inet_daddr = 0;
434 if (flags & BIND_WITH_LOCK)
442 int inet6_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len)
444 u32 flags = BIND_WITH_LOCK;
445 const struct proto *prot;
448 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
449 prot = READ_ONCE(sk->sk_prot);
450 /* If the socket has its own bind function then use it. */
452 return prot->bind(sk, uaddr, addr_len);
454 if (addr_len < SIN6_LEN_RFC2133)
457 /* BPF prog is run before any checks are done so that if the prog
458 * changes context in a wrong way it will be caught.
460 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len,
461 CGROUP_INET6_BIND, &flags);
465 return __inet6_bind(sk, uaddr, addr_len, flags);
468 /* bind for INET6 API */
469 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
471 return inet6_bind_sk(sock->sk, uaddr, addr_len);
473 EXPORT_SYMBOL(inet6_bind);
475 int inet6_release(struct socket *sock)
477 struct sock *sk = sock->sk;
483 ipv6_sock_mc_close(sk);
486 ipv6_sock_ac_close(sk);
488 return inet_release(sock);
490 EXPORT_SYMBOL(inet6_release);
492 void inet6_cleanup_sock(struct sock *sk)
494 struct ipv6_pinfo *np = inet6_sk(sk);
496 struct ipv6_txoptions *opt;
498 /* Release rx options */
500 skb = xchg(&np->pktoptions, NULL);
503 skb = xchg(&np->rxpmtu, NULL);
506 /* Free flowlabels */
507 fl6_free_socklist(sk);
509 /* Free tx options */
511 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
513 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
517 EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
520 * This does both peername and sockname.
522 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
525 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
526 int sin_addr_len = sizeof(*sin);
527 struct sock *sk = sock->sk;
528 struct inet_sock *inet = inet_sk(sk);
529 struct ipv6_pinfo *np = inet6_sk(sk);
531 sin->sin6_family = AF_INET6;
532 sin->sin6_flowinfo = 0;
533 sin->sin6_scope_id = 0;
536 if (!inet->inet_dport ||
537 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
542 sin->sin6_port = inet->inet_dport;
543 sin->sin6_addr = sk->sk_v6_daddr;
544 if (inet6_test_bit(SNDFLOW, sk))
545 sin->sin6_flowinfo = np->flow_label;
546 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
547 CGROUP_INET6_GETPEERNAME);
549 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
550 sin->sin6_addr = np->saddr;
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, &sin_addr_len,
555 CGROUP_INET6_GETSOCKNAME);
557 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
558 sk->sk_bound_dev_if);
562 EXPORT_SYMBOL(inet6_getname);
564 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
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;
574 struct in6_rtmsg rtmsg;
576 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
578 return ipv6_route_ioctl(net, cmd, &rtmsg);
581 return addrconf_add_ifaddr(net, argp);
583 return addrconf_del_ifaddr(net, argp);
585 return addrconf_set_dstaddr(net, argp);
587 /* IPV6_ADDRFORM can change sk->sk_prot under us. */
588 prot = READ_ONCE(sk->sk_prot);
591 return sk_ioctl(sk, cmd, (void __user *)arg);
596 EXPORT_SYMBOL(inet6_ioctl);
599 struct compat_in6_rtmsg {
600 struct in6_addr rtmsg_dst;
601 struct in6_addr rtmsg_src;
602 struct in6_addr rtmsg_gateway;
612 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
613 struct compat_in6_rtmsg __user *ur)
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))
629 return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
632 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
634 void __user *argp = compat_ptr(arg);
635 struct sock *sk = sock->sk;
640 return inet6_compat_routing_ioctl(sk, cmd, argp);
645 EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
646 #endif /* CONFIG_COMPAT */
648 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
650 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
652 struct sock *sk = sock->sk;
653 const struct proto *prot;
655 if (unlikely(inet_send_prepare(sk)))
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,
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,
669 struct sock *sk = sock->sk;
670 const struct proto *prot;
674 if (likely(!(flags & MSG_ERRQUEUE)))
675 sock_rps_record_flow(sk);
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);
682 msg->msg_namelen = addr_len;
686 const struct proto_ops inet6_stream_ops = {
688 .owner = THIS_MODULE,
689 .release = inet6_release,
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 */
707 .splice_eof = inet_splice_eof,
708 .sendmsg_locked = tcp_sendmsg_locked,
709 .splice_read = tcp_splice_read,
710 .read_sock = tcp_read_sock,
711 .read_skb = tcp_read_skb,
712 .peek_len = tcp_peek_len,
714 .compat_ioctl = inet6_compat_ioctl,
716 .set_rcvlowat = tcp_set_rcvlowat,
719 const struct proto_ops inet6_dgram_ops = {
721 .owner = THIS_MODULE,
722 .release = inet6_release,
724 .connect = inet_dgram_connect, /* ok */
725 .socketpair = sock_no_socketpair, /* a do nothing */
726 .accept = sock_no_accept, /* a do nothing */
727 .getname = inet6_getname,
728 .poll = udp_poll, /* ok */
729 .ioctl = inet6_ioctl, /* must change */
730 .gettstamp = sock_gettstamp,
731 .listen = sock_no_listen, /* ok */
732 .shutdown = inet_shutdown, /* ok */
733 .setsockopt = sock_common_setsockopt, /* ok */
734 .getsockopt = sock_common_getsockopt, /* ok */
735 .sendmsg = inet6_sendmsg, /* retpoline's sake */
736 .recvmsg = inet6_recvmsg, /* retpoline's sake */
737 .read_skb = udp_read_skb,
738 .mmap = sock_no_mmap,
739 .set_peek_off = sk_set_peek_off,
741 .compat_ioctl = inet6_compat_ioctl,
745 static const struct net_proto_family inet6_family_ops = {
747 .create = inet6_create,
748 .owner = THIS_MODULE,
751 int inet6_register_protosw(struct inet_protosw *p)
753 struct list_head *lh;
754 struct inet_protosw *answer;
755 struct list_head *last_perm;
756 int protocol = p->protocol;
759 spin_lock_bh(&inetsw6_lock);
762 if (p->type >= SOCK_MAX)
765 /* If we are trying to override a permanent protocol, bail. */
768 last_perm = &inetsw6[p->type];
769 list_for_each(lh, &inetsw6[p->type]) {
770 answer = list_entry(lh, struct inet_protosw, list);
772 /* Check only the non-wild match. */
773 if (INET_PROTOSW_PERMANENT & answer->flags) {
774 if (protocol == answer->protocol)
784 /* Add the new entry after the last permanent entry if any, so that
785 * the new entry does not override a permanent entry when matched with
786 * a wild-card protocol. But it is allowed to override any existing
787 * non-permanent entry. This means that when we remove this entry, the
788 * system automatically returns to the old behavior.
790 list_add_rcu(&p->list, last_perm);
793 spin_unlock_bh(&inetsw6_lock);
797 pr_err("Attempt to override permanent protocol %d\n", protocol);
801 pr_err("Ignoring attempt to register invalid socket type %d\n",
805 EXPORT_SYMBOL(inet6_register_protosw);
808 inet6_unregister_protosw(struct inet_protosw *p)
810 if (INET_PROTOSW_PERMANENT & p->flags) {
811 pr_err("Attempt to unregister permanent protocol %d\n",
814 spin_lock_bh(&inetsw6_lock);
815 list_del_rcu(&p->list);
816 spin_unlock_bh(&inetsw6_lock);
821 EXPORT_SYMBOL(inet6_unregister_protosw);
823 int inet6_sk_rebuild_header(struct sock *sk)
825 struct ipv6_pinfo *np = inet6_sk(sk);
826 struct dst_entry *dst;
828 dst = __sk_dst_check(sk, np->dst_cookie);
831 struct inet_sock *inet = inet_sk(sk);
832 struct in6_addr *final_p, final;
835 memset(&fl6, 0, sizeof(fl6));
836 fl6.flowi6_proto = sk->sk_protocol;
837 fl6.daddr = sk->sk_v6_daddr;
838 fl6.saddr = np->saddr;
839 fl6.flowlabel = np->flow_label;
840 fl6.flowi6_oif = sk->sk_bound_dev_if;
841 fl6.flowi6_mark = sk->sk_mark;
842 fl6.fl6_dport = inet->inet_dport;
843 fl6.fl6_sport = inet->inet_sport;
844 fl6.flowi6_uid = sk->sk_uid;
845 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
848 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
852 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
854 sk->sk_route_caps = 0;
855 WRITE_ONCE(sk->sk_err_soft, -PTR_ERR(dst));
859 ip6_dst_store(sk, dst, NULL, NULL);
864 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
866 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
867 const struct inet6_skb_parm *opt)
869 const struct ipv6_pinfo *np = inet6_sk(sk);
872 if (((opt->flags & IP6SKB_HOPBYHOP) &&
873 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
874 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
875 np->rxopt.bits.rxflow) ||
876 (opt->srcrt && (np->rxopt.bits.srcrt ||
877 np->rxopt.bits.osrcrt)) ||
878 ((opt->dst1 || opt->dst0) &&
879 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
884 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
886 static struct packet_type ipv6_packet_type __read_mostly = {
887 .type = cpu_to_be16(ETH_P_IPV6),
889 .list_func = ipv6_list_rcv,
892 static int __init ipv6_packet_init(void)
894 dev_add_pack(&ipv6_packet_type);
898 static void ipv6_packet_cleanup(void)
900 dev_remove_pack(&ipv6_packet_type);
903 static int __net_init ipv6_init_mibs(struct net *net)
907 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
908 if (!net->mib.udp_stats_in6)
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)
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);
924 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
925 if (!net->mib.icmpv6_statistics)
927 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
929 if (!net->mib.icmpv6msg_statistics)
930 goto err_icmpmsg_mib;
934 free_percpu(net->mib.icmpv6_statistics);
936 free_percpu(net->mib.ipv6_statistics);
938 free_percpu(net->mib.udplite_stats_in6);
940 free_percpu(net->mib.udp_stats_in6);
944 static void ipv6_cleanup_mibs(struct net *net)
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);
953 static int __net_init inet6_net_init(struct net *net)
957 net->ipv6.sysctl.bindv6only = 0;
958 net->ipv6.sysctl.icmpv6_time = 1*HZ;
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;
964 /* By default, rate limit error messages.
965 * Except for pmtu discovery, it would break it.
966 * proc_do_large_bitmap needs pointer to the bitmap.
968 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
969 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
970 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
972 net->ipv6.sysctl.flowlabel_consistency = 1;
973 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
974 net->ipv6.sysctl.idgen_retries = 3;
975 net->ipv6.sysctl.idgen_delay = 1 * HZ;
976 net->ipv6.sysctl.flowlabel_state_ranges = 0;
977 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
978 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
979 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
980 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
981 net->ipv6.sysctl.fib_notify_on_flag_change = 0;
982 atomic_set(&net->ipv6.fib6_sernum, 1);
984 net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID;
985 net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE;
987 err = ipv6_init_mibs(net);
990 #ifdef CONFIG_PROC_FS
991 err = udp6_proc_init(net);
994 err = tcp6_proc_init(net);
997 err = ac6_proc_init(net);
1003 #ifdef CONFIG_PROC_FS
1005 tcp6_proc_exit(net);
1007 udp6_proc_exit(net);
1009 ipv6_cleanup_mibs(net);
1014 static void __net_exit inet6_net_exit(struct net *net)
1016 #ifdef CONFIG_PROC_FS
1017 udp6_proc_exit(net);
1018 tcp6_proc_exit(net);
1021 ipv6_cleanup_mibs(net);
1024 static struct pernet_operations inet6_net_ops = {
1025 .init = inet6_net_init,
1026 .exit = inet6_net_exit,
1029 static int ipv6_route_input(struct sk_buff *skb)
1031 ip6_route_input(skb);
1032 return skb_dst(skb)->error;
1035 static const struct ipv6_stub ipv6_stub_impl = {
1036 .ipv6_sock_mc_join = ipv6_sock_mc_join,
1037 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1038 .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1039 .ipv6_route_input = ipv6_route_input,
1040 .fib6_get_table = fib6_get_table,
1041 .fib6_table_lookup = fib6_table_lookup,
1042 .fib6_lookup = fib6_lookup,
1043 .fib6_select_path = fib6_select_path,
1044 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1045 .fib6_nh_init = fib6_nh_init,
1046 .fib6_nh_release = fib6_nh_release,
1047 .fib6_nh_release_dsts = fib6_nh_release_dsts,
1048 .fib6_update_sernum = fib6_update_sernum_stub,
1049 .fib6_rt_update = fib6_rt_update,
1050 .ip6_del_rt = ip6_del_rt,
1051 .udpv6_encap_enable = udpv6_encap_enable,
1052 .ndisc_send_na = ndisc_send_na,
1053 #if IS_ENABLED(CONFIG_XFRM)
1054 .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1055 .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1056 .xfrm6_gro_udp_encap_rcv = xfrm6_gro_udp_encap_rcv,
1057 .xfrm6_rcv_encap = xfrm6_rcv_encap,
1060 .ipv6_fragment = ip6_fragment,
1061 .ipv6_dev_find = ipv6_dev_find,
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 .ipv6_dev_get_saddr = ipv6_dev_get_saddr,
1072 static int __init inet6_init(void)
1074 struct list_head *r;
1077 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1079 /* Register the socket-side information for inet6_create. */
1080 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1083 raw_hashinfo_init(&raw_v6_hashinfo);
1085 if (disable_ipv6_mod) {
1086 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1090 err = proto_register(&tcpv6_prot, 1);
1094 err = proto_register(&udpv6_prot, 1);
1096 goto out_unregister_tcp_proto;
1098 err = proto_register(&udplitev6_prot, 1);
1100 goto out_unregister_udp_proto;
1102 err = proto_register(&rawv6_prot, 1);
1104 goto out_unregister_udplite_proto;
1106 err = proto_register(&pingv6_prot, 1);
1108 goto out_unregister_raw_proto;
1110 /* We MUST register RAW sockets before we create the ICMP6,
1111 * IGMP6, or NDISC control sockets.
1115 goto out_unregister_ping_proto;
1117 /* Register the family here so that the init calls below will
1118 * be able to create sockets. (?? is this dangerous ??)
1120 err = sock_register(&inet6_family_ops);
1122 goto out_sock_register_fail;
1125 * ipngwg API draft makes clear that the correct semantics
1126 * for TCP and UDP is to consider one TCP and UDP instance
1127 * in a host available by both INET and INET6 APIs and
1128 * able to communicate via both network protocols.
1131 err = register_pernet_subsys(&inet6_net_ops);
1133 goto register_pernet_fail;
1134 err = ip6_mr_init();
1137 err = icmpv6_init();
1147 err = ipv6_netfilter_init();
1149 goto netfilter_fail;
1150 /* Create /proc/foo6 entries. */
1151 #ifdef CONFIG_PROC_FS
1153 if (raw6_proc_init())
1154 goto proc_raw6_fail;
1155 if (udplite6_proc_init())
1156 goto proc_udplite6_fail;
1157 if (ipv6_misc_proc_init())
1158 goto proc_misc6_fail;
1159 if (if6_proc_init())
1162 err = ip6_route_init();
1164 goto ip6_route_fail;
1165 err = ndisc_late_init();
1167 goto ndisc_late_fail;
1168 err = ip6_flowlabel_init();
1170 goto ip6_flowlabel_fail;
1171 err = ipv6_anycast_init();
1173 goto ipv6_anycast_fail;
1174 err = addrconf_init();
1178 /* Init v6 extension headers. */
1179 err = ipv6_exthdrs_init();
1181 goto ipv6_exthdrs_fail;
1183 err = ipv6_frag_init();
1185 goto ipv6_frag_fail;
1187 /* Init v6 transport protocols. */
1192 err = udplitev6_init();
1194 goto udplitev6_fail;
1196 err = udpv6_offload_init();
1198 goto udpv6_offload_fail;
1204 err = ipv6_packet_init();
1206 goto ipv6_packet_fail;
1208 err = pingv6_init();
1212 err = calipso_init();
1228 err = igmp6_late_init();
1230 goto igmp6_late_err;
1232 #ifdef CONFIG_SYSCTL
1233 err = ipv6_sysctl_register();
1238 /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1240 ipv6_stub = &ipv6_stub_impl;
1241 ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1245 #ifdef CONFIG_SYSCTL
1247 igmp6_late_cleanup();
1260 ipv6_packet_cleanup();
1264 udpv6_offload_exit();
1272 ipv6_exthdrs_exit();
1276 ipv6_anycast_cleanup();
1278 ip6_flowlabel_cleanup();
1280 ndisc_late_cleanup();
1282 ip6_route_cleanup();
1284 #ifdef CONFIG_PROC_FS
1287 ipv6_misc_proc_exit();
1289 udplite6_proc_exit();
1294 ipv6_netfilter_fini();
1304 unregister_pernet_subsys(&inet6_net_ops);
1305 register_pernet_fail:
1306 sock_unregister(PF_INET6);
1307 rtnl_unregister_all(PF_INET6);
1308 out_sock_register_fail:
1310 out_unregister_ping_proto:
1311 proto_unregister(&pingv6_prot);
1312 out_unregister_raw_proto:
1313 proto_unregister(&rawv6_prot);
1314 out_unregister_udplite_proto:
1315 proto_unregister(&udplitev6_prot);
1316 out_unregister_udp_proto:
1317 proto_unregister(&udpv6_prot);
1318 out_unregister_tcp_proto:
1319 proto_unregister(&tcpv6_prot);
1322 module_init(inet6_init);
1324 MODULE_ALIAS_NETPROTO(PF_INET6);