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>
67 #include <linux/uaccess.h>
68 #include <linux/mroute6.h>
70 #include "ip6_offload.h"
72 MODULE_AUTHOR("Cast of dozens");
73 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
74 MODULE_LICENSE("GPL");
76 /* The inetsw6 table contains everything that inet6_create needs to
79 static struct list_head inetsw6[SOCK_MAX];
80 static DEFINE_SPINLOCK(inetsw6_lock);
82 struct ipv6_params ipv6_defaults = {
87 static int disable_ipv6_mod;
89 module_param_named(disable, disable_ipv6_mod, int, 0444);
90 MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
92 module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
93 MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
95 module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
96 MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
98 bool ipv6_mod_enabled(void)
100 return disable_ipv6_mod == 0;
102 EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
104 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
106 const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
108 return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
111 static int inet6_create(struct net *net, struct socket *sock, int protocol,
114 struct inet_sock *inet;
115 struct ipv6_pinfo *np;
117 struct inet_protosw *answer;
118 struct proto *answer_prot;
119 unsigned char answer_flags;
120 int try_loading_module = 0;
123 if (protocol < 0 || protocol >= IPPROTO_MAX)
126 /* Look for the requested type/protocol pair. */
128 err = -ESOCKTNOSUPPORT;
130 list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
133 /* Check the non-wild match. */
134 if (protocol == answer->protocol) {
135 if (protocol != IPPROTO_IP)
138 /* Check for the two wild cases. */
139 if (IPPROTO_IP == protocol) {
140 protocol = answer->protocol;
143 if (IPPROTO_IP == answer->protocol)
146 err = -EPROTONOSUPPORT;
150 if (try_loading_module < 2) {
153 * Be more specific, e.g. net-pf-10-proto-132-type-1
154 * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
156 if (++try_loading_module == 1)
157 request_module("net-pf-%d-proto-%d-type-%d",
158 PF_INET6, protocol, sock->type);
160 * Fall back to generic, e.g. net-pf-10-proto-132
161 * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
164 request_module("net-pf-%d-proto-%d",
166 goto lookup_protocol;
172 if (sock->type == SOCK_RAW && !kern &&
173 !ns_capable(net->user_ns, CAP_NET_RAW))
176 sock->ops = answer->ops;
177 answer_prot = answer->prot;
178 answer_flags = answer->flags;
181 WARN_ON(!answer_prot->slab);
184 sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
188 sock_init_data(sock, sk);
191 if (INET_PROTOSW_REUSE & answer_flags)
192 sk->sk_reuse = SK_CAN_REUSE;
195 inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
197 if (SOCK_RAW == sock->type) {
198 inet->inet_num = protocol;
199 if (IPPROTO_RAW == protocol)
203 sk->sk_destruct = inet_sock_destruct;
204 sk->sk_family = PF_INET6;
205 sk->sk_protocol = protocol;
207 sk->sk_backlog_rcv = answer->prot->backlog_rcv;
209 inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
211 np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
214 np->pmtudisc = IPV6_PMTUDISC_WANT;
215 np->repflow = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
216 sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
218 /* Init the ipv4 part of the socket since we can have sockets
219 * using v6 API for ipv4.
226 RCU_INIT_POINTER(inet->mc_list, NULL);
229 if (net->ipv4.sysctl_ip_no_pmtu_disc)
230 inet->pmtudisc = IP_PMTUDISC_DONT;
232 inet->pmtudisc = IP_PMTUDISC_WANT;
234 * Increment only the relevant sk_prot->socks debug field, this changes
235 * the previous behaviour of incrementing both the equivalent to
236 * answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
238 * This allows better debug granularity as we'll know exactly how many
239 * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
240 * transport protocol socks. -acme
242 sk_refcnt_debug_inc(sk);
244 if (inet->inet_num) {
245 /* It assumes that any protocol which allows
246 * the user to assign a number at socket
247 * creation time automatically shares.
249 inet->inet_sport = htons(inet->inet_num);
250 err = sk->sk_prot->hash(sk);
252 sk_common_release(sk);
256 if (sk->sk_prot->init) {
257 err = sk->sk_prot->init(sk);
259 sk_common_release(sk);
265 err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
267 sk_common_release(sk);
278 static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
281 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
282 struct inet_sock *inet = inet_sk(sk);
283 struct ipv6_pinfo *np = inet6_sk(sk);
284 struct net *net = sock_net(sk);
291 if (addr->sin6_family != AF_INET6)
292 return -EAFNOSUPPORT;
294 addr_type = ipv6_addr_type(&addr->sin6_addr);
295 if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
298 snum = ntohs(addr->sin6_port);
299 if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
300 snum && inet_port_requires_bind_service(net, snum) &&
301 !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
304 if (flags & BIND_WITH_LOCK)
307 /* Check these errors (active socket, double bind). */
308 if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
313 /* Check if the address belongs to the host. */
314 if (addr_type == IPV6_ADDR_MAPPED) {
315 struct net_device *dev = NULL;
318 /* Binding to v4-mapped address on a v6-only socket
321 if (sk->sk_ipv6only) {
327 if (sk->sk_bound_dev_if) {
328 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
335 /* Reproduce AF_INET checks to make the bindings consistent */
336 v4addr = addr->sin6_addr.s6_addr32[3];
337 chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
340 if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
342 err = -EADDRNOTAVAIL;
346 if (addr_type != IPV6_ADDR_ANY) {
347 struct net_device *dev = NULL;
350 if (__ipv6_addr_needs_scope_id(addr_type)) {
351 if (addr_len >= sizeof(struct sockaddr_in6) &&
352 addr->sin6_scope_id) {
353 /* Override any existing binding, if another one
354 * is supplied by user.
356 sk->sk_bound_dev_if = addr->sin6_scope_id;
359 /* Binding to link-local address requires an interface */
360 if (!sk->sk_bound_dev_if) {
366 if (sk->sk_bound_dev_if) {
367 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
374 /* ipv4 addr of the socket is invalid. Only the
375 * unspecified and mapped address have a v4 equivalent.
377 v4addr = LOOPBACK4_IPV6;
378 if (!(addr_type & IPV6_ADDR_MULTICAST)) {
379 if (!ipv6_can_nonlocal_bind(net, inet) &&
380 !ipv6_chk_addr(net, &addr->sin6_addr,
382 err = -EADDRNOTAVAIL;
390 inet->inet_rcv_saddr = v4addr;
391 inet->inet_saddr = v4addr;
393 sk->sk_v6_rcv_saddr = addr->sin6_addr;
395 if (!(addr_type & IPV6_ADDR_MULTICAST))
396 np->saddr = addr->sin6_addr;
398 saved_ipv6only = sk->sk_ipv6only;
399 if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
402 /* Make sure we are allowed to bind here. */
403 if (snum || !(inet->bind_address_no_port ||
404 (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
405 if (sk->sk_prot->get_port(sk, snum)) {
406 sk->sk_ipv6only = saved_ipv6only;
407 inet_reset_saddr(sk);
411 if (!(flags & BIND_FROM_BPF)) {
412 err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
414 sk->sk_ipv6only = saved_ipv6only;
415 inet_reset_saddr(sk);
416 if (sk->sk_prot->put_port)
417 sk->sk_prot->put_port(sk);
423 if (addr_type != IPV6_ADDR_ANY)
424 sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
426 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
427 inet->inet_sport = htons(inet->inet_num);
428 inet->inet_dport = 0;
429 inet->inet_daddr = 0;
431 if (flags & BIND_WITH_LOCK)
439 /* bind for INET6 API */
440 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
442 struct sock *sk = sock->sk;
443 u32 flags = BIND_WITH_LOCK;
446 /* If the socket has its own bind function then use it. */
447 if (sk->sk_prot->bind)
448 return sk->sk_prot->bind(sk, uaddr, addr_len);
450 if (addr_len < SIN6_LEN_RFC2133)
453 /* BPF prog is run before any checks are done so that if the prog
454 * changes context in a wrong way it will be caught.
456 err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr,
457 CGROUP_INET6_BIND, &flags);
461 return __inet6_bind(sk, uaddr, addr_len, flags);
463 EXPORT_SYMBOL(inet6_bind);
465 int inet6_release(struct socket *sock)
467 struct sock *sk = sock->sk;
473 ipv6_sock_mc_close(sk);
476 ipv6_sock_ac_close(sk);
478 return inet_release(sock);
480 EXPORT_SYMBOL(inet6_release);
482 void inet6_destroy_sock(struct sock *sk)
484 struct ipv6_pinfo *np = inet6_sk(sk);
486 struct ipv6_txoptions *opt;
488 /* Release rx options */
490 skb = xchg(&np->pktoptions, NULL);
493 skb = xchg(&np->rxpmtu, NULL);
496 /* Free flowlabels */
497 fl6_free_socklist(sk);
499 /* Free tx options */
501 opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
503 atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
507 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
510 * This does both peername and sockname.
512 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
515 struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
516 struct sock *sk = sock->sk;
517 struct inet_sock *inet = inet_sk(sk);
518 struct ipv6_pinfo *np = inet6_sk(sk);
520 sin->sin6_family = AF_INET6;
521 sin->sin6_flowinfo = 0;
522 sin->sin6_scope_id = 0;
525 if (!inet->inet_dport ||
526 (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
531 sin->sin6_port = inet->inet_dport;
532 sin->sin6_addr = sk->sk_v6_daddr;
534 sin->sin6_flowinfo = np->flow_label;
535 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
536 CGROUP_INET6_GETPEERNAME);
538 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
539 sin->sin6_addr = np->saddr;
541 sin->sin6_addr = sk->sk_v6_rcv_saddr;
542 sin->sin6_port = inet->inet_sport;
543 BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin,
544 CGROUP_INET6_GETSOCKNAME);
546 sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
547 sk->sk_bound_dev_if);
551 EXPORT_SYMBOL(inet6_getname);
553 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
555 void __user *argp = (void __user *)arg;
556 struct sock *sk = sock->sk;
557 struct net *net = sock_net(sk);
562 struct in6_rtmsg rtmsg;
564 if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
566 return ipv6_route_ioctl(net, cmd, &rtmsg);
569 return addrconf_add_ifaddr(net, argp);
571 return addrconf_del_ifaddr(net, argp);
573 return addrconf_set_dstaddr(net, argp);
575 if (!sk->sk_prot->ioctl)
577 return sk->sk_prot->ioctl(sk, cmd, arg);
582 EXPORT_SYMBOL(inet6_ioctl);
585 struct compat_in6_rtmsg {
586 struct in6_addr rtmsg_dst;
587 struct in6_addr rtmsg_src;
588 struct in6_addr rtmsg_gateway;
598 static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
599 struct compat_in6_rtmsg __user *ur)
603 if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
604 3 * sizeof(struct in6_addr)) ||
605 get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
606 get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
607 get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
608 get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
609 get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
610 get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
611 get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
615 return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
618 int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
620 void __user *argp = compat_ptr(arg);
621 struct sock *sk = sock->sk;
626 return inet6_compat_routing_ioctl(sk, cmd, argp);
631 EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
632 #endif /* CONFIG_COMPAT */
634 INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
636 int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
638 struct sock *sk = sock->sk;
640 if (unlikely(inet_send_prepare(sk)))
643 return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
647 INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
648 size_t, int, int, int *));
649 int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
652 struct sock *sk = sock->sk;
656 if (likely(!(flags & MSG_ERRQUEUE)))
657 sock_rps_record_flow(sk);
659 err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
660 sk, msg, size, flags & MSG_DONTWAIT,
661 flags & ~MSG_DONTWAIT, &addr_len);
663 msg->msg_namelen = addr_len;
667 const struct proto_ops inet6_stream_ops = {
669 .owner = THIS_MODULE,
670 .release = inet6_release,
672 .connect = inet_stream_connect, /* ok */
673 .socketpair = sock_no_socketpair, /* a do nothing */
674 .accept = inet_accept, /* ok */
675 .getname = inet6_getname,
676 .poll = tcp_poll, /* ok */
677 .ioctl = inet6_ioctl, /* must change */
678 .gettstamp = sock_gettstamp,
679 .listen = inet_listen, /* ok */
680 .shutdown = inet_shutdown, /* ok */
681 .setsockopt = sock_common_setsockopt, /* ok */
682 .getsockopt = sock_common_getsockopt, /* ok */
683 .sendmsg = inet6_sendmsg, /* retpoline's sake */
684 .recvmsg = inet6_recvmsg, /* retpoline's sake */
688 .sendpage = inet_sendpage,
689 .sendmsg_locked = tcp_sendmsg_locked,
690 .sendpage_locked = tcp_sendpage_locked,
691 .splice_read = tcp_splice_read,
692 .read_sock = tcp_read_sock,
693 .peek_len = tcp_peek_len,
695 .compat_ioctl = inet6_compat_ioctl,
697 .set_rcvlowat = tcp_set_rcvlowat,
700 const struct proto_ops inet6_dgram_ops = {
702 .owner = THIS_MODULE,
703 .release = inet6_release,
705 .connect = inet_dgram_connect, /* ok */
706 .socketpair = sock_no_socketpair, /* a do nothing */
707 .accept = sock_no_accept, /* a do nothing */
708 .getname = inet6_getname,
709 .poll = udp_poll, /* ok */
710 .ioctl = inet6_ioctl, /* must change */
711 .gettstamp = sock_gettstamp,
712 .listen = sock_no_listen, /* ok */
713 .shutdown = inet_shutdown, /* ok */
714 .setsockopt = sock_common_setsockopt, /* ok */
715 .getsockopt = sock_common_getsockopt, /* ok */
716 .sendmsg = inet6_sendmsg, /* retpoline's sake */
717 .recvmsg = inet6_recvmsg, /* retpoline's sake */
718 .read_sock = udp_read_sock,
719 .mmap = sock_no_mmap,
720 .sendpage = sock_no_sendpage,
721 .set_peek_off = sk_set_peek_off,
723 .compat_ioctl = inet6_compat_ioctl,
727 static const struct net_proto_family inet6_family_ops = {
729 .create = inet6_create,
730 .owner = THIS_MODULE,
733 int inet6_register_protosw(struct inet_protosw *p)
735 struct list_head *lh;
736 struct inet_protosw *answer;
737 struct list_head *last_perm;
738 int protocol = p->protocol;
741 spin_lock_bh(&inetsw6_lock);
744 if (p->type >= SOCK_MAX)
747 /* If we are trying to override a permanent protocol, bail. */
750 last_perm = &inetsw6[p->type];
751 list_for_each(lh, &inetsw6[p->type]) {
752 answer = list_entry(lh, struct inet_protosw, list);
754 /* Check only the non-wild match. */
755 if (INET_PROTOSW_PERMANENT & answer->flags) {
756 if (protocol == answer->protocol)
766 /* Add the new entry after the last permanent entry if any, so that
767 * the new entry does not override a permanent entry when matched with
768 * a wild-card protocol. But it is allowed to override any existing
769 * non-permanent entry. This means that when we remove this entry, the
770 * system automatically returns to the old behavior.
772 list_add_rcu(&p->list, last_perm);
775 spin_unlock_bh(&inetsw6_lock);
779 pr_err("Attempt to override permanent protocol %d\n", protocol);
783 pr_err("Ignoring attempt to register invalid socket type %d\n",
787 EXPORT_SYMBOL(inet6_register_protosw);
790 inet6_unregister_protosw(struct inet_protosw *p)
792 if (INET_PROTOSW_PERMANENT & p->flags) {
793 pr_err("Attempt to unregister permanent protocol %d\n",
796 spin_lock_bh(&inetsw6_lock);
797 list_del_rcu(&p->list);
798 spin_unlock_bh(&inetsw6_lock);
803 EXPORT_SYMBOL(inet6_unregister_protosw);
805 int inet6_sk_rebuild_header(struct sock *sk)
807 struct ipv6_pinfo *np = inet6_sk(sk);
808 struct dst_entry *dst;
810 dst = __sk_dst_check(sk, np->dst_cookie);
813 struct inet_sock *inet = inet_sk(sk);
814 struct in6_addr *final_p, final;
817 memset(&fl6, 0, sizeof(fl6));
818 fl6.flowi6_proto = sk->sk_protocol;
819 fl6.daddr = sk->sk_v6_daddr;
820 fl6.saddr = np->saddr;
821 fl6.flowlabel = np->flow_label;
822 fl6.flowi6_oif = sk->sk_bound_dev_if;
823 fl6.flowi6_mark = sk->sk_mark;
824 fl6.fl6_dport = inet->inet_dport;
825 fl6.fl6_sport = inet->inet_sport;
826 fl6.flowi6_uid = sk->sk_uid;
827 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
830 final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
834 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
836 sk->sk_route_caps = 0;
837 sk->sk_err_soft = -PTR_ERR(dst);
841 ip6_dst_store(sk, dst, NULL, NULL);
846 EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
848 bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
849 const struct inet6_skb_parm *opt)
851 const struct ipv6_pinfo *np = inet6_sk(sk);
854 if (((opt->flags & IP6SKB_HOPBYHOP) &&
855 (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
856 (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
857 np->rxopt.bits.rxflow) ||
858 (opt->srcrt && (np->rxopt.bits.srcrt ||
859 np->rxopt.bits.osrcrt)) ||
860 ((opt->dst1 || opt->dst0) &&
861 (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
866 EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
868 static struct packet_type ipv6_packet_type __read_mostly = {
869 .type = cpu_to_be16(ETH_P_IPV6),
871 .list_func = ipv6_list_rcv,
874 static int __init ipv6_packet_init(void)
876 dev_add_pack(&ipv6_packet_type);
880 static void ipv6_packet_cleanup(void)
882 dev_remove_pack(&ipv6_packet_type);
885 static int __net_init ipv6_init_mibs(struct net *net)
889 net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
890 if (!net->mib.udp_stats_in6)
892 net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
893 if (!net->mib.udplite_stats_in6)
894 goto err_udplite_mib;
895 net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
896 if (!net->mib.ipv6_statistics)
899 for_each_possible_cpu(i) {
900 struct ipstats_mib *af_inet6_stats;
901 af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
902 u64_stats_init(&af_inet6_stats->syncp);
906 net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
907 if (!net->mib.icmpv6_statistics)
909 net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
911 if (!net->mib.icmpv6msg_statistics)
912 goto err_icmpmsg_mib;
916 free_percpu(net->mib.icmpv6_statistics);
918 free_percpu(net->mib.ipv6_statistics);
920 free_percpu(net->mib.udplite_stats_in6);
922 free_percpu(net->mib.udp_stats_in6);
926 static void ipv6_cleanup_mibs(struct net *net)
928 free_percpu(net->mib.udp_stats_in6);
929 free_percpu(net->mib.udplite_stats_in6);
930 free_percpu(net->mib.ipv6_statistics);
931 free_percpu(net->mib.icmpv6_statistics);
932 kfree(net->mib.icmpv6msg_statistics);
935 static int __net_init inet6_net_init(struct net *net)
939 net->ipv6.sysctl.bindv6only = 0;
940 net->ipv6.sysctl.icmpv6_time = 1*HZ;
941 net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
942 net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
943 net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
945 /* By default, rate limit error messages.
946 * Except for pmtu discovery, it would break it.
947 * proc_do_large_bitmap needs pointer to the bitmap.
949 bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
950 bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
951 net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
953 net->ipv6.sysctl.flowlabel_consistency = 1;
954 net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
955 net->ipv6.sysctl.idgen_retries = 3;
956 net->ipv6.sysctl.idgen_delay = 1 * HZ;
957 net->ipv6.sysctl.flowlabel_state_ranges = 0;
958 net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
959 net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
960 net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
961 net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
962 net->ipv6.sysctl.fib_notify_on_flag_change = 0;
963 atomic_set(&net->ipv6.fib6_sernum, 1);
965 net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID;
966 net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE;
968 err = ipv6_init_mibs(net);
971 #ifdef CONFIG_PROC_FS
972 err = udp6_proc_init(net);
975 err = tcp6_proc_init(net);
978 err = ac6_proc_init(net);
984 #ifdef CONFIG_PROC_FS
990 ipv6_cleanup_mibs(net);
995 static void __net_exit inet6_net_exit(struct net *net)
997 #ifdef CONFIG_PROC_FS
1002 ipv6_cleanup_mibs(net);
1005 static struct pernet_operations inet6_net_ops = {
1006 .init = inet6_net_init,
1007 .exit = inet6_net_exit,
1010 static int ipv6_route_input(struct sk_buff *skb)
1012 ip6_route_input(skb);
1013 return skb_dst(skb)->error;
1016 static const struct ipv6_stub ipv6_stub_impl = {
1017 .ipv6_sock_mc_join = ipv6_sock_mc_join,
1018 .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
1019 .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
1020 .ipv6_route_input = ipv6_route_input,
1021 .fib6_get_table = fib6_get_table,
1022 .fib6_table_lookup = fib6_table_lookup,
1023 .fib6_lookup = fib6_lookup,
1024 .fib6_select_path = fib6_select_path,
1025 .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
1026 .fib6_nh_init = fib6_nh_init,
1027 .fib6_nh_release = fib6_nh_release,
1028 .fib6_nh_release_dsts = fib6_nh_release_dsts,
1029 .fib6_update_sernum = fib6_update_sernum_stub,
1030 .fib6_rt_update = fib6_rt_update,
1031 .ip6_del_rt = ip6_del_rt,
1032 .udpv6_encap_enable = udpv6_encap_enable,
1033 .ndisc_send_na = ndisc_send_na,
1034 #if IS_ENABLED(CONFIG_XFRM)
1035 .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
1036 .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
1037 .xfrm6_rcv_encap = xfrm6_rcv_encap,
1040 .ipv6_fragment = ip6_fragment,
1041 .ipv6_dev_find = ipv6_dev_find,
1044 static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
1045 .inet6_bind = __inet6_bind,
1046 .udp6_lib_lookup = __udp6_lib_lookup,
1049 static int __init inet6_init(void)
1051 struct list_head *r;
1054 sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
1056 /* Register the socket-side information for inet6_create. */
1057 for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
1060 if (disable_ipv6_mod) {
1061 pr_info("Loaded, but administratively disabled, reboot required to enable\n");
1065 err = proto_register(&tcpv6_prot, 1);
1069 err = proto_register(&udpv6_prot, 1);
1071 goto out_unregister_tcp_proto;
1073 err = proto_register(&udplitev6_prot, 1);
1075 goto out_unregister_udp_proto;
1077 err = proto_register(&rawv6_prot, 1);
1079 goto out_unregister_udplite_proto;
1081 err = proto_register(&pingv6_prot, 1);
1083 goto out_unregister_raw_proto;
1085 /* We MUST register RAW sockets before we create the ICMP6,
1086 * IGMP6, or NDISC control sockets.
1090 goto out_unregister_ping_proto;
1092 /* Register the family here so that the init calls below will
1093 * be able to create sockets. (?? is this dangerous ??)
1095 err = sock_register(&inet6_family_ops);
1097 goto out_sock_register_fail;
1100 * ipngwg API draft makes clear that the correct semantics
1101 * for TCP and UDP is to consider one TCP and UDP instance
1102 * in a host available by both INET and INET6 APIs and
1103 * able to communicate via both network protocols.
1106 err = register_pernet_subsys(&inet6_net_ops);
1108 goto register_pernet_fail;
1109 err = ip6_mr_init();
1112 err = icmpv6_init();
1122 err = ipv6_netfilter_init();
1124 goto netfilter_fail;
1125 /* Create /proc/foo6 entries. */
1126 #ifdef CONFIG_PROC_FS
1128 if (raw6_proc_init())
1129 goto proc_raw6_fail;
1130 if (udplite6_proc_init())
1131 goto proc_udplite6_fail;
1132 if (ipv6_misc_proc_init())
1133 goto proc_misc6_fail;
1134 if (if6_proc_init())
1137 err = ip6_route_init();
1139 goto ip6_route_fail;
1140 err = ndisc_late_init();
1142 goto ndisc_late_fail;
1143 err = ip6_flowlabel_init();
1145 goto ip6_flowlabel_fail;
1146 err = ipv6_anycast_init();
1148 goto ipv6_anycast_fail;
1149 err = addrconf_init();
1153 /* Init v6 extension headers. */
1154 err = ipv6_exthdrs_init();
1156 goto ipv6_exthdrs_fail;
1158 err = ipv6_frag_init();
1160 goto ipv6_frag_fail;
1162 /* Init v6 transport protocols. */
1167 err = udplitev6_init();
1169 goto udplitev6_fail;
1171 err = udpv6_offload_init();
1173 goto udpv6_offload_fail;
1179 err = ipv6_packet_init();
1181 goto ipv6_packet_fail;
1183 err = pingv6_init();
1187 err = calipso_init();
1203 err = igmp6_late_init();
1205 goto igmp6_late_err;
1207 #ifdef CONFIG_SYSCTL
1208 err = ipv6_sysctl_register();
1213 /* ensure that ipv6 stubs are visible only after ipv6 is ready */
1215 ipv6_stub = &ipv6_stub_impl;
1216 ipv6_bpf_stub = &ipv6_bpf_stub_impl;
1220 #ifdef CONFIG_SYSCTL
1222 igmp6_late_cleanup();
1235 ipv6_packet_cleanup();
1239 udpv6_offload_exit();
1247 ipv6_exthdrs_exit();
1251 ipv6_anycast_cleanup();
1253 ip6_flowlabel_cleanup();
1255 ndisc_late_cleanup();
1257 ip6_route_cleanup();
1259 #ifdef CONFIG_PROC_FS
1262 ipv6_misc_proc_exit();
1264 udplite6_proc_exit();
1269 ipv6_netfilter_fini();
1279 unregister_pernet_subsys(&inet6_net_ops);
1280 register_pernet_fail:
1281 sock_unregister(PF_INET6);
1282 rtnl_unregister_all(PF_INET6);
1283 out_sock_register_fail:
1285 out_unregister_ping_proto:
1286 proto_unregister(&pingv6_prot);
1287 out_unregister_raw_proto:
1288 proto_unregister(&rawv6_prot);
1289 out_unregister_udplite_proto:
1290 proto_unregister(&udplitev6_prot);
1291 out_unregister_udp_proto:
1292 proto_unregister(&udpv6_prot);
1293 out_unregister_tcp_proto:
1294 proto_unregister(&tcpv6_prot);
1297 module_init(inet6_init);
1299 MODULE_ALIAS_NETPROTO(PF_INET6);