summaryrefslogtreecommitdiffstats
path: root/net/ipv6/af_inet6.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /net/ipv6/af_inet6.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/ipv6/af_inet6.c')
-rw-r--r--net/ipv6/af_inet6.c1321
1 files changed, 1321 insertions, 0 deletions
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
new file mode 100644
index 0000000000..4375bfa4f6
--- /dev/null
+++ b/net/ipv6/af_inet6.c
@@ -0,0 +1,1321 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * PF_INET6 socket protocol family
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * Adapted from linux/net/ipv4/af_inet.c
+ *
+ * Fixes:
+ * piggy, Karl Knutson : Socket protocol table
+ * Hideaki YOSHIFUJI : sin6_scope_id support
+ * Arnaldo Melo : check proc_net_create return, cleanups
+ */
+
+#define pr_fmt(fmt) "IPv6: " fmt
+
+#include <linux/module.h>
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/icmpv6.h>
+#include <linux/netfilter_ipv6.h>
+
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/udp.h>
+#include <net/udplite.h>
+#include <net/tcp.h>
+#include <net/ping.h>
+#include <net/protocol.h>
+#include <net/inet_common.h>
+#include <net/route.h>
+#include <net/transp_v6.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/ipv6_stubs.h>
+#include <net/ndisc.h>
+#ifdef CONFIG_IPV6_TUNNEL
+#include <net/ip6_tunnel.h>
+#endif
+#include <net/calipso.h>
+#include <net/seg6.h>
+#include <net/rpl.h>
+#include <net/compat.h>
+#include <net/xfrm.h>
+#include <net/ioam6.h>
+#include <net/rawv6.h>
+
+#include <linux/uaccess.h>
+#include <linux/mroute6.h>
+
+#include "ip6_offload.h"
+
+MODULE_AUTHOR("Cast of dozens");
+MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
+MODULE_LICENSE("GPL");
+
+/* The inetsw6 table contains everything that inet6_create needs to
+ * build a new socket.
+ */
+static struct list_head inetsw6[SOCK_MAX];
+static DEFINE_SPINLOCK(inetsw6_lock);
+
+struct ipv6_params ipv6_defaults = {
+ .disable_ipv6 = 0,
+ .autoconf = 1,
+};
+
+static int disable_ipv6_mod;
+
+module_param_named(disable, disable_ipv6_mod, int, 0444);
+MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
+
+module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
+MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
+
+module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
+MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
+
+bool ipv6_mod_enabled(void)
+{
+ return disable_ipv6_mod == 0;
+}
+EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
+
+static struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
+{
+ const int offset = sk->sk_prot->ipv6_pinfo_offset;
+
+ return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
+}
+
+void inet6_sock_destruct(struct sock *sk)
+{
+ inet6_cleanup_sock(sk);
+ inet_sock_destruct(sk);
+}
+EXPORT_SYMBOL_GPL(inet6_sock_destruct);
+
+static int inet6_create(struct net *net, struct socket *sock, int protocol,
+ int kern)
+{
+ struct inet_sock *inet;
+ struct ipv6_pinfo *np;
+ struct sock *sk;
+ struct inet_protosw *answer;
+ struct proto *answer_prot;
+ unsigned char answer_flags;
+ int try_loading_module = 0;
+ int err;
+
+ if (protocol < 0 || protocol >= IPPROTO_MAX)
+ return -EINVAL;
+
+ /* Look for the requested type/protocol pair. */
+lookup_protocol:
+ err = -ESOCKTNOSUPPORT;
+ rcu_read_lock();
+ list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
+
+ err = 0;
+ /* Check the non-wild match. */
+ if (protocol == answer->protocol) {
+ if (protocol != IPPROTO_IP)
+ break;
+ } else {
+ /* Check for the two wild cases. */
+ if (IPPROTO_IP == protocol) {
+ protocol = answer->protocol;
+ break;
+ }
+ if (IPPROTO_IP == answer->protocol)
+ break;
+ }
+ err = -EPROTONOSUPPORT;
+ }
+
+ if (err) {
+ if (try_loading_module < 2) {
+ rcu_read_unlock();
+ /*
+ * Be more specific, e.g. net-pf-10-proto-132-type-1
+ * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
+ */
+ if (++try_loading_module == 1)
+ request_module("net-pf-%d-proto-%d-type-%d",
+ PF_INET6, protocol, sock->type);
+ /*
+ * Fall back to generic, e.g. net-pf-10-proto-132
+ * (net-pf-PF_INET6-proto-IPPROTO_SCTP)
+ */
+ else
+ request_module("net-pf-%d-proto-%d",
+ PF_INET6, protocol);
+ goto lookup_protocol;
+ } else
+ goto out_rcu_unlock;
+ }
+
+ err = -EPERM;
+ if (sock->type == SOCK_RAW && !kern &&
+ !ns_capable(net->user_ns, CAP_NET_RAW))
+ goto out_rcu_unlock;
+
+ sock->ops = answer->ops;
+ answer_prot = answer->prot;
+ answer_flags = answer->flags;
+ rcu_read_unlock();
+
+ WARN_ON(!answer_prot->slab);
+
+ err = -ENOBUFS;
+ sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
+ if (!sk)
+ goto out;
+
+ sock_init_data(sock, sk);
+
+ err = 0;
+ if (INET_PROTOSW_REUSE & answer_flags)
+ sk->sk_reuse = SK_CAN_REUSE;
+
+ if (INET_PROTOSW_ICSK & answer_flags)
+ inet_init_csk_locks(sk);
+
+ inet = inet_sk(sk);
+ inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags);
+
+ if (SOCK_RAW == sock->type) {
+ inet->inet_num = protocol;
+ if (IPPROTO_RAW == protocol)
+ inet_set_bit(HDRINCL, sk);
+ }
+
+ sk->sk_destruct = inet6_sock_destruct;
+ sk->sk_family = PF_INET6;
+ sk->sk_protocol = protocol;
+
+ sk->sk_backlog_rcv = answer->prot->backlog_rcv;
+
+ inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
+ np->hop_limit = -1;
+ np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
+ np->mc_loop = 1;
+ np->mc_all = 1;
+ np->pmtudisc = IPV6_PMTUDISC_WANT;
+ np->repflow = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
+ sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
+ sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
+
+ /* Init the ipv4 part of the socket since we can have sockets
+ * using v6 API for ipv4.
+ */
+ inet->uc_ttl = -1;
+
+ inet_set_bit(MC_LOOP, sk);
+ inet->mc_ttl = 1;
+ inet->mc_index = 0;
+ RCU_INIT_POINTER(inet->mc_list, NULL);
+ inet->rcv_tos = 0;
+
+ if (READ_ONCE(net->ipv4.sysctl_ip_no_pmtu_disc))
+ inet->pmtudisc = IP_PMTUDISC_DONT;
+ else
+ inet->pmtudisc = IP_PMTUDISC_WANT;
+
+ if (inet->inet_num) {
+ /* It assumes that any protocol which allows
+ * the user to assign a number at socket
+ * creation time automatically shares.
+ */
+ inet->inet_sport = htons(inet->inet_num);
+ err = sk->sk_prot->hash(sk);
+ if (err) {
+ sk_common_release(sk);
+ goto out;
+ }
+ }
+ if (sk->sk_prot->init) {
+ err = sk->sk_prot->init(sk);
+ if (err) {
+ sk_common_release(sk);
+ goto out;
+ }
+ }
+
+ if (!kern) {
+ err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
+ if (err) {
+ sk_common_release(sk);
+ goto out;
+ }
+ }
+out:
+ return err;
+out_rcu_unlock:
+ rcu_read_unlock();
+ goto out;
+}
+
+static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
+ u32 flags)
+{
+ struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct net *net = sock_net(sk);
+ __be32 v4addr = 0;
+ unsigned short snum;
+ bool saved_ipv6only;
+ int addr_type = 0;
+ int err = 0;
+
+ if (addr->sin6_family != AF_INET6)
+ return -EAFNOSUPPORT;
+
+ addr_type = ipv6_addr_type(&addr->sin6_addr);
+ if ((addr_type & IPV6_ADDR_MULTICAST) && sk->sk_type == SOCK_STREAM)
+ return -EINVAL;
+
+ snum = ntohs(addr->sin6_port);
+ if (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) &&
+ snum && inet_port_requires_bind_service(net, snum) &&
+ !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
+ return -EACCES;
+
+ if (flags & BIND_WITH_LOCK)
+ lock_sock(sk);
+
+ /* Check these errors (active socket, double bind). */
+ if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ /* Check if the address belongs to the host. */
+ if (addr_type == IPV6_ADDR_MAPPED) {
+ struct net_device *dev = NULL;
+ int chk_addr_ret;
+
+ /* Binding to v4-mapped address on a v6-only socket
+ * makes no sense
+ */
+ if (ipv6_only_sock(sk)) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ rcu_read_lock();
+ if (sk->sk_bound_dev_if) {
+ dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
+ if (!dev) {
+ err = -ENODEV;
+ goto out_unlock;
+ }
+ }
+
+ /* Reproduce AF_INET checks to make the bindings consistent */
+ v4addr = addr->sin6_addr.s6_addr32[3];
+ chk_addr_ret = inet_addr_type_dev_table(net, dev, v4addr);
+ rcu_read_unlock();
+
+ if (!inet_addr_valid_or_nonlocal(net, inet, v4addr,
+ chk_addr_ret)) {
+ err = -EADDRNOTAVAIL;
+ goto out;
+ }
+ } else {
+ if (addr_type != IPV6_ADDR_ANY) {
+ struct net_device *dev = NULL;
+
+ rcu_read_lock();
+ if (__ipv6_addr_needs_scope_id(addr_type)) {
+ if (addr_len >= sizeof(struct sockaddr_in6) &&
+ addr->sin6_scope_id) {
+ /* Override any existing binding, if another one
+ * is supplied by user.
+ */
+ sk->sk_bound_dev_if = addr->sin6_scope_id;
+ }
+
+ /* Binding to link-local address requires an interface */
+ if (!sk->sk_bound_dev_if) {
+ err = -EINVAL;
+ goto out_unlock;
+ }
+ }
+
+ if (sk->sk_bound_dev_if) {
+ dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
+ if (!dev) {
+ err = -ENODEV;
+ goto out_unlock;
+ }
+ }
+
+ /* ipv4 addr of the socket is invalid. Only the
+ * unspecified and mapped address have a v4 equivalent.
+ */
+ v4addr = LOOPBACK4_IPV6;
+ if (!(addr_type & IPV6_ADDR_MULTICAST)) {
+ if (!ipv6_can_nonlocal_bind(net, inet) &&
+ !ipv6_chk_addr(net, &addr->sin6_addr,
+ dev, 0)) {
+ err = -EADDRNOTAVAIL;
+ goto out_unlock;
+ }
+ }
+ rcu_read_unlock();
+ }
+ }
+
+ inet->inet_rcv_saddr = v4addr;
+ inet->inet_saddr = v4addr;
+
+ sk->sk_v6_rcv_saddr = addr->sin6_addr;
+
+ if (!(addr_type & IPV6_ADDR_MULTICAST))
+ np->saddr = addr->sin6_addr;
+
+ saved_ipv6only = sk->sk_ipv6only;
+ if (addr_type != IPV6_ADDR_ANY && addr_type != IPV6_ADDR_MAPPED)
+ sk->sk_ipv6only = 1;
+
+ /* Make sure we are allowed to bind here. */
+ if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
+ (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
+ err = sk->sk_prot->get_port(sk, snum);
+ if (err) {
+ sk->sk_ipv6only = saved_ipv6only;
+ inet_reset_saddr(sk);
+ goto out;
+ }
+ if (!(flags & BIND_FROM_BPF)) {
+ err = BPF_CGROUP_RUN_PROG_INET6_POST_BIND(sk);
+ if (err) {
+ sk->sk_ipv6only = saved_ipv6only;
+ inet_reset_saddr(sk);
+ if (sk->sk_prot->put_port)
+ sk->sk_prot->put_port(sk);
+ goto out;
+ }
+ }
+ }
+
+ if (addr_type != IPV6_ADDR_ANY)
+ sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
+ if (snum)
+ sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
+ inet->inet_sport = htons(inet->inet_num);
+ inet->inet_dport = 0;
+ inet->inet_daddr = 0;
+out:
+ if (flags & BIND_WITH_LOCK)
+ release_sock(sk);
+ return err;
+out_unlock:
+ rcu_read_unlock();
+ goto out;
+}
+
+int inet6_bind_sk(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+{
+ u32 flags = BIND_WITH_LOCK;
+ const struct proto *prot;
+ int err = 0;
+
+ /* IPV6_ADDRFORM can change sk->sk_prot under us. */
+ prot = READ_ONCE(sk->sk_prot);
+ /* If the socket has its own bind function then use it. */
+ if (prot->bind)
+ return prot->bind(sk, uaddr, addr_len);
+
+ if (addr_len < SIN6_LEN_RFC2133)
+ return -EINVAL;
+
+ /* BPF prog is run before any checks are done so that if the prog
+ * changes context in a wrong way it will be caught.
+ */
+ err = BPF_CGROUP_RUN_PROG_INET_BIND_LOCK(sk, uaddr, &addr_len,
+ CGROUP_INET6_BIND, &flags);
+ if (err)
+ return err;
+
+ return __inet6_bind(sk, uaddr, addr_len, flags);
+}
+
+/* bind for INET6 API */
+int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
+{
+ return inet6_bind_sk(sock->sk, uaddr, addr_len);
+}
+EXPORT_SYMBOL(inet6_bind);
+
+int inet6_release(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+
+ if (!sk)
+ return -EINVAL;
+
+ /* Free mc lists */
+ ipv6_sock_mc_close(sk);
+
+ /* Free ac lists */
+ ipv6_sock_ac_close(sk);
+
+ return inet_release(sock);
+}
+EXPORT_SYMBOL(inet6_release);
+
+void inet6_cleanup_sock(struct sock *sk)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct sk_buff *skb;
+ struct ipv6_txoptions *opt;
+
+ /* Release rx options */
+
+ skb = xchg(&np->pktoptions, NULL);
+ kfree_skb(skb);
+
+ skb = xchg(&np->rxpmtu, NULL);
+ kfree_skb(skb);
+
+ /* Free flowlabels */
+ fl6_free_socklist(sk);
+
+ /* Free tx options */
+
+ opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
+ if (opt) {
+ atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
+ txopt_put(opt);
+ }
+}
+EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
+
+/*
+ * This does both peername and sockname.
+ */
+int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
+ int peer)
+{
+ struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
+ int sin_addr_len = sizeof(*sin);
+ struct sock *sk = sock->sk;
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+
+ sin->sin6_family = AF_INET6;
+ sin->sin6_flowinfo = 0;
+ sin->sin6_scope_id = 0;
+ lock_sock(sk);
+ if (peer) {
+ if (!inet->inet_dport ||
+ (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
+ peer == 1)) {
+ release_sock(sk);
+ return -ENOTCONN;
+ }
+ sin->sin6_port = inet->inet_dport;
+ sin->sin6_addr = sk->sk_v6_daddr;
+ if (np->sndflow)
+ sin->sin6_flowinfo = np->flow_label;
+ BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
+ CGROUP_INET6_GETPEERNAME);
+ } else {
+ if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
+ sin->sin6_addr = np->saddr;
+ else
+ sin->sin6_addr = sk->sk_v6_rcv_saddr;
+ sin->sin6_port = inet->inet_sport;
+ BPF_CGROUP_RUN_SA_PROG(sk, (struct sockaddr *)sin, &sin_addr_len,
+ CGROUP_INET6_GETSOCKNAME);
+ }
+ sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
+ sk->sk_bound_dev_if);
+ release_sock(sk);
+ return sin_addr_len;
+}
+EXPORT_SYMBOL(inet6_getname);
+
+int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ void __user *argp = (void __user *)arg;
+ struct sock *sk = sock->sk;
+ struct net *net = sock_net(sk);
+ const struct proto *prot;
+
+ switch (cmd) {
+ case SIOCADDRT:
+ case SIOCDELRT: {
+ struct in6_rtmsg rtmsg;
+
+ if (copy_from_user(&rtmsg, argp, sizeof(rtmsg)))
+ return -EFAULT;
+ return ipv6_route_ioctl(net, cmd, &rtmsg);
+ }
+ case SIOCSIFADDR:
+ return addrconf_add_ifaddr(net, argp);
+ case SIOCDIFADDR:
+ return addrconf_del_ifaddr(net, argp);
+ case SIOCSIFDSTADDR:
+ return addrconf_set_dstaddr(net, argp);
+ default:
+ /* IPV6_ADDRFORM can change sk->sk_prot under us. */
+ prot = READ_ONCE(sk->sk_prot);
+ if (!prot->ioctl)
+ return -ENOIOCTLCMD;
+ return sk_ioctl(sk, cmd, (void __user *)arg);
+ }
+ /*NOTREACHED*/
+ return 0;
+}
+EXPORT_SYMBOL(inet6_ioctl);
+
+#ifdef CONFIG_COMPAT
+struct compat_in6_rtmsg {
+ struct in6_addr rtmsg_dst;
+ struct in6_addr rtmsg_src;
+ struct in6_addr rtmsg_gateway;
+ u32 rtmsg_type;
+ u16 rtmsg_dst_len;
+ u16 rtmsg_src_len;
+ u32 rtmsg_metric;
+ u32 rtmsg_info;
+ u32 rtmsg_flags;
+ s32 rtmsg_ifindex;
+};
+
+static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
+ struct compat_in6_rtmsg __user *ur)
+{
+ struct in6_rtmsg rt;
+
+ if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
+ 3 * sizeof(struct in6_addr)) ||
+ get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
+ get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
+ get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
+ get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
+ get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
+ get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
+ get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
+ return -EFAULT;
+
+
+ return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
+}
+
+int inet6_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ void __user *argp = compat_ptr(arg);
+ struct sock *sk = sock->sk;
+
+ switch (cmd) {
+ case SIOCADDRT:
+ case SIOCDELRT:
+ return inet6_compat_routing_ioctl(sk, cmd, argp);
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
+#endif /* CONFIG_COMPAT */
+
+INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
+ size_t));
+int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
+{
+ struct sock *sk = sock->sk;
+ const struct proto *prot;
+
+ if (unlikely(inet_send_prepare(sk)))
+ return -EAGAIN;
+
+ /* IPV6_ADDRFORM can change sk->sk_prot under us. */
+ prot = READ_ONCE(sk->sk_prot);
+ return INDIRECT_CALL_2(prot->sendmsg, tcp_sendmsg, udpv6_sendmsg,
+ sk, msg, size);
+}
+
+INDIRECT_CALLABLE_DECLARE(int udpv6_recvmsg(struct sock *, struct msghdr *,
+ size_t, int, int *));
+int inet6_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
+ int flags)
+{
+ struct sock *sk = sock->sk;
+ const struct proto *prot;
+ int addr_len = 0;
+ int err;
+
+ if (likely(!(flags & MSG_ERRQUEUE)))
+ sock_rps_record_flow(sk);
+
+ /* IPV6_ADDRFORM can change sk->sk_prot under us. */
+ prot = READ_ONCE(sk->sk_prot);
+ err = INDIRECT_CALL_2(prot->recvmsg, tcp_recvmsg, udpv6_recvmsg,
+ sk, msg, size, flags, &addr_len);
+ if (err >= 0)
+ msg->msg_namelen = addr_len;
+ return err;
+}
+
+const struct proto_ops inet6_stream_ops = {
+ .family = PF_INET6,
+ .owner = THIS_MODULE,
+ .release = inet6_release,
+ .bind = inet6_bind,
+ .connect = inet_stream_connect, /* ok */
+ .socketpair = sock_no_socketpair, /* a do nothing */
+ .accept = inet_accept, /* ok */
+ .getname = inet6_getname,
+ .poll = tcp_poll, /* ok */
+ .ioctl = inet6_ioctl, /* must change */
+ .gettstamp = sock_gettstamp,
+ .listen = inet_listen, /* ok */
+ .shutdown = inet_shutdown, /* ok */
+ .setsockopt = sock_common_setsockopt, /* ok */
+ .getsockopt = sock_common_getsockopt, /* ok */
+ .sendmsg = inet6_sendmsg, /* retpoline's sake */
+ .recvmsg = inet6_recvmsg, /* retpoline's sake */
+#ifdef CONFIG_MMU
+ .mmap = tcp_mmap,
+#endif
+ .splice_eof = inet_splice_eof,
+ .sendmsg_locked = tcp_sendmsg_locked,
+ .splice_read = tcp_splice_read,
+ .read_sock = tcp_read_sock,
+ .read_skb = tcp_read_skb,
+ .peek_len = tcp_peek_len,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = inet6_compat_ioctl,
+#endif
+ .set_rcvlowat = tcp_set_rcvlowat,
+};
+
+const struct proto_ops inet6_dgram_ops = {
+ .family = PF_INET6,
+ .owner = THIS_MODULE,
+ .release = inet6_release,
+ .bind = inet6_bind,
+ .connect = inet_dgram_connect, /* ok */
+ .socketpair = sock_no_socketpair, /* a do nothing */
+ .accept = sock_no_accept, /* a do nothing */
+ .getname = inet6_getname,
+ .poll = udp_poll, /* ok */
+ .ioctl = inet6_ioctl, /* must change */
+ .gettstamp = sock_gettstamp,
+ .listen = sock_no_listen, /* ok */
+ .shutdown = inet_shutdown, /* ok */
+ .setsockopt = sock_common_setsockopt, /* ok */
+ .getsockopt = sock_common_getsockopt, /* ok */
+ .sendmsg = inet6_sendmsg, /* retpoline's sake */
+ .recvmsg = inet6_recvmsg, /* retpoline's sake */
+ .read_skb = udp_read_skb,
+ .mmap = sock_no_mmap,
+ .set_peek_off = sk_set_peek_off,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = inet6_compat_ioctl,
+#endif
+};
+
+static const struct net_proto_family inet6_family_ops = {
+ .family = PF_INET6,
+ .create = inet6_create,
+ .owner = THIS_MODULE,
+};
+
+int inet6_register_protosw(struct inet_protosw *p)
+{
+ struct list_head *lh;
+ struct inet_protosw *answer;
+ struct list_head *last_perm;
+ int protocol = p->protocol;
+ int ret;
+
+ spin_lock_bh(&inetsw6_lock);
+
+ ret = -EINVAL;
+ if (p->type >= SOCK_MAX)
+ goto out_illegal;
+
+ /* If we are trying to override a permanent protocol, bail. */
+ answer = NULL;
+ ret = -EPERM;
+ last_perm = &inetsw6[p->type];
+ list_for_each(lh, &inetsw6[p->type]) {
+ answer = list_entry(lh, struct inet_protosw, list);
+
+ /* Check only the non-wild match. */
+ if (INET_PROTOSW_PERMANENT & answer->flags) {
+ if (protocol == answer->protocol)
+ break;
+ last_perm = lh;
+ }
+
+ answer = NULL;
+ }
+ if (answer)
+ goto out_permanent;
+
+ /* Add the new entry after the last permanent entry if any, so that
+ * the new entry does not override a permanent entry when matched with
+ * a wild-card protocol. But it is allowed to override any existing
+ * non-permanent entry. This means that when we remove this entry, the
+ * system automatically returns to the old behavior.
+ */
+ list_add_rcu(&p->list, last_perm);
+ ret = 0;
+out:
+ spin_unlock_bh(&inetsw6_lock);
+ return ret;
+
+out_permanent:
+ pr_err("Attempt to override permanent protocol %d\n", protocol);
+ goto out;
+
+out_illegal:
+ pr_err("Ignoring attempt to register invalid socket type %d\n",
+ p->type);
+ goto out;
+}
+EXPORT_SYMBOL(inet6_register_protosw);
+
+void
+inet6_unregister_protosw(struct inet_protosw *p)
+{
+ if (INET_PROTOSW_PERMANENT & p->flags) {
+ pr_err("Attempt to unregister permanent protocol %d\n",
+ p->protocol);
+ } else {
+ spin_lock_bh(&inetsw6_lock);
+ list_del_rcu(&p->list);
+ spin_unlock_bh(&inetsw6_lock);
+
+ synchronize_net();
+ }
+}
+EXPORT_SYMBOL(inet6_unregister_protosw);
+
+int inet6_sk_rebuild_header(struct sock *sk)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct dst_entry *dst;
+
+ dst = __sk_dst_check(sk, np->dst_cookie);
+
+ if (!dst) {
+ struct inet_sock *inet = inet_sk(sk);
+ struct in6_addr *final_p, final;
+ struct flowi6 fl6;
+
+ memset(&fl6, 0, sizeof(fl6));
+ fl6.flowi6_proto = sk->sk_protocol;
+ fl6.daddr = sk->sk_v6_daddr;
+ fl6.saddr = np->saddr;
+ fl6.flowlabel = np->flow_label;
+ fl6.flowi6_oif = sk->sk_bound_dev_if;
+ fl6.flowi6_mark = sk->sk_mark;
+ fl6.fl6_dport = inet->inet_dport;
+ fl6.fl6_sport = inet->inet_sport;
+ fl6.flowi6_uid = sk->sk_uid;
+ security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
+
+ rcu_read_lock();
+ final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
+ &final);
+ rcu_read_unlock();
+
+ dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
+ if (IS_ERR(dst)) {
+ sk->sk_route_caps = 0;
+ WRITE_ONCE(sk->sk_err_soft, -PTR_ERR(dst));
+ return PTR_ERR(dst);
+ }
+
+ ip6_dst_store(sk, dst, NULL, NULL);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
+
+bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
+ const struct inet6_skb_parm *opt)
+{
+ const struct ipv6_pinfo *np = inet6_sk(sk);
+
+ if (np->rxopt.all) {
+ if (((opt->flags & IP6SKB_HOPBYHOP) &&
+ (np->rxopt.bits.hopopts || np->rxopt.bits.ohopopts)) ||
+ (ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
+ np->rxopt.bits.rxflow) ||
+ (opt->srcrt && (np->rxopt.bits.srcrt ||
+ np->rxopt.bits.osrcrt)) ||
+ ((opt->dst1 || opt->dst0) &&
+ (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
+ return true;
+ }
+ return false;
+}
+EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
+
+static struct packet_type ipv6_packet_type __read_mostly = {
+ .type = cpu_to_be16(ETH_P_IPV6),
+ .func = ipv6_rcv,
+ .list_func = ipv6_list_rcv,
+};
+
+static int __init ipv6_packet_init(void)
+{
+ dev_add_pack(&ipv6_packet_type);
+ return 0;
+}
+
+static void ipv6_packet_cleanup(void)
+{
+ dev_remove_pack(&ipv6_packet_type);
+}
+
+static int __net_init ipv6_init_mibs(struct net *net)
+{
+ int i;
+
+ net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
+ if (!net->mib.udp_stats_in6)
+ return -ENOMEM;
+ net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
+ if (!net->mib.udplite_stats_in6)
+ goto err_udplite_mib;
+ net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
+ if (!net->mib.ipv6_statistics)
+ goto err_ip_mib;
+
+ for_each_possible_cpu(i) {
+ struct ipstats_mib *af_inet6_stats;
+ af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
+ u64_stats_init(&af_inet6_stats->syncp);
+ }
+
+
+ net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
+ if (!net->mib.icmpv6_statistics)
+ goto err_icmp_mib;
+ net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
+ GFP_KERNEL);
+ if (!net->mib.icmpv6msg_statistics)
+ goto err_icmpmsg_mib;
+ return 0;
+
+err_icmpmsg_mib:
+ free_percpu(net->mib.icmpv6_statistics);
+err_icmp_mib:
+ free_percpu(net->mib.ipv6_statistics);
+err_ip_mib:
+ free_percpu(net->mib.udplite_stats_in6);
+err_udplite_mib:
+ free_percpu(net->mib.udp_stats_in6);
+ return -ENOMEM;
+}
+
+static void ipv6_cleanup_mibs(struct net *net)
+{
+ free_percpu(net->mib.udp_stats_in6);
+ free_percpu(net->mib.udplite_stats_in6);
+ free_percpu(net->mib.ipv6_statistics);
+ free_percpu(net->mib.icmpv6_statistics);
+ kfree(net->mib.icmpv6msg_statistics);
+}
+
+static int __net_init inet6_net_init(struct net *net)
+{
+ int err = 0;
+
+ net->ipv6.sysctl.bindv6only = 0;
+ net->ipv6.sysctl.icmpv6_time = 1*HZ;
+ net->ipv6.sysctl.icmpv6_echo_ignore_all = 0;
+ net->ipv6.sysctl.icmpv6_echo_ignore_multicast = 0;
+ net->ipv6.sysctl.icmpv6_echo_ignore_anycast = 0;
+ net->ipv6.sysctl.icmpv6_error_anycast_as_unicast = 0;
+
+ /* By default, rate limit error messages.
+ * Except for pmtu discovery, it would break it.
+ * proc_do_large_bitmap needs pointer to the bitmap.
+ */
+ bitmap_set(net->ipv6.sysctl.icmpv6_ratemask, 0, ICMPV6_ERRMSG_MAX + 1);
+ bitmap_clear(net->ipv6.sysctl.icmpv6_ratemask, ICMPV6_PKT_TOOBIG, 1);
+ net->ipv6.sysctl.icmpv6_ratemask_ptr = net->ipv6.sysctl.icmpv6_ratemask;
+
+ net->ipv6.sysctl.flowlabel_consistency = 1;
+ net->ipv6.sysctl.auto_flowlabels = IP6_DEFAULT_AUTO_FLOW_LABELS;
+ net->ipv6.sysctl.idgen_retries = 3;
+ net->ipv6.sysctl.idgen_delay = 1 * HZ;
+ net->ipv6.sysctl.flowlabel_state_ranges = 0;
+ net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
+ net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
+ net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
+ net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
+ net->ipv6.sysctl.fib_notify_on_flag_change = 0;
+ atomic_set(&net->ipv6.fib6_sernum, 1);
+
+ net->ipv6.sysctl.ioam6_id = IOAM6_DEFAULT_ID;
+ net->ipv6.sysctl.ioam6_id_wide = IOAM6_DEFAULT_ID_WIDE;
+
+ err = ipv6_init_mibs(net);
+ if (err)
+ return err;
+#ifdef CONFIG_PROC_FS
+ err = udp6_proc_init(net);
+ if (err)
+ goto out;
+ err = tcp6_proc_init(net);
+ if (err)
+ goto proc_tcp6_fail;
+ err = ac6_proc_init(net);
+ if (err)
+ goto proc_ac6_fail;
+#endif
+ return err;
+
+#ifdef CONFIG_PROC_FS
+proc_ac6_fail:
+ tcp6_proc_exit(net);
+proc_tcp6_fail:
+ udp6_proc_exit(net);
+out:
+ ipv6_cleanup_mibs(net);
+ return err;
+#endif
+}
+
+static void __net_exit inet6_net_exit(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+ udp6_proc_exit(net);
+ tcp6_proc_exit(net);
+ ac6_proc_exit(net);
+#endif
+ ipv6_cleanup_mibs(net);
+}
+
+static struct pernet_operations inet6_net_ops = {
+ .init = inet6_net_init,
+ .exit = inet6_net_exit,
+};
+
+static int ipv6_route_input(struct sk_buff *skb)
+{
+ ip6_route_input(skb);
+ return skb_dst(skb)->error;
+}
+
+static const struct ipv6_stub ipv6_stub_impl = {
+ .ipv6_sock_mc_join = ipv6_sock_mc_join,
+ .ipv6_sock_mc_drop = ipv6_sock_mc_drop,
+ .ipv6_dst_lookup_flow = ip6_dst_lookup_flow,
+ .ipv6_route_input = ipv6_route_input,
+ .fib6_get_table = fib6_get_table,
+ .fib6_table_lookup = fib6_table_lookup,
+ .fib6_lookup = fib6_lookup,
+ .fib6_select_path = fib6_select_path,
+ .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
+ .fib6_nh_init = fib6_nh_init,
+ .fib6_nh_release = fib6_nh_release,
+ .fib6_nh_release_dsts = fib6_nh_release_dsts,
+ .fib6_update_sernum = fib6_update_sernum_stub,
+ .fib6_rt_update = fib6_rt_update,
+ .ip6_del_rt = ip6_del_rt,
+ .udpv6_encap_enable = udpv6_encap_enable,
+ .ndisc_send_na = ndisc_send_na,
+#if IS_ENABLED(CONFIG_XFRM)
+ .xfrm6_local_rxpmtu = xfrm6_local_rxpmtu,
+ .xfrm6_udp_encap_rcv = xfrm6_udp_encap_rcv,
+ .xfrm6_rcv_encap = xfrm6_rcv_encap,
+#endif
+ .nd_tbl = &nd_tbl,
+ .ipv6_fragment = ip6_fragment,
+ .ipv6_dev_find = ipv6_dev_find,
+};
+
+static const struct ipv6_bpf_stub ipv6_bpf_stub_impl = {
+ .inet6_bind = __inet6_bind,
+ .udp6_lib_lookup = __udp6_lib_lookup,
+ .ipv6_setsockopt = do_ipv6_setsockopt,
+ .ipv6_getsockopt = do_ipv6_getsockopt,
+};
+
+static int __init inet6_init(void)
+{
+ struct list_head *r;
+ int err = 0;
+
+ sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
+
+ /* Register the socket-side information for inet6_create. */
+ for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
+ INIT_LIST_HEAD(r);
+
+ raw_hashinfo_init(&raw_v6_hashinfo);
+
+ if (disable_ipv6_mod) {
+ pr_info("Loaded, but administratively disabled, reboot required to enable\n");
+ goto out;
+ }
+
+ err = proto_register(&tcpv6_prot, 1);
+ if (err)
+ goto out;
+
+ err = proto_register(&udpv6_prot, 1);
+ if (err)
+ goto out_unregister_tcp_proto;
+
+ err = proto_register(&udplitev6_prot, 1);
+ if (err)
+ goto out_unregister_udp_proto;
+
+ err = proto_register(&rawv6_prot, 1);
+ if (err)
+ goto out_unregister_udplite_proto;
+
+ err = proto_register(&pingv6_prot, 1);
+ if (err)
+ goto out_unregister_raw_proto;
+
+ /* We MUST register RAW sockets before we create the ICMP6,
+ * IGMP6, or NDISC control sockets.
+ */
+ err = rawv6_init();
+ if (err)
+ goto out_unregister_ping_proto;
+
+ /* Register the family here so that the init calls below will
+ * be able to create sockets. (?? is this dangerous ??)
+ */
+ err = sock_register(&inet6_family_ops);
+ if (err)
+ goto out_sock_register_fail;
+
+ /*
+ * ipngwg API draft makes clear that the correct semantics
+ * for TCP and UDP is to consider one TCP and UDP instance
+ * in a host available by both INET and INET6 APIs and
+ * able to communicate via both network protocols.
+ */
+
+ err = register_pernet_subsys(&inet6_net_ops);
+ if (err)
+ goto register_pernet_fail;
+ err = ip6_mr_init();
+ if (err)
+ goto ipmr_fail;
+ err = icmpv6_init();
+ if (err)
+ goto icmp_fail;
+ err = ndisc_init();
+ if (err)
+ goto ndisc_fail;
+ err = igmp6_init();
+ if (err)
+ goto igmp_fail;
+
+ err = ipv6_netfilter_init();
+ if (err)
+ goto netfilter_fail;
+ /* Create /proc/foo6 entries. */
+#ifdef CONFIG_PROC_FS
+ err = -ENOMEM;
+ if (raw6_proc_init())
+ goto proc_raw6_fail;
+ if (udplite6_proc_init())
+ goto proc_udplite6_fail;
+ if (ipv6_misc_proc_init())
+ goto proc_misc6_fail;
+ if (if6_proc_init())
+ goto proc_if6_fail;
+#endif
+ err = ip6_route_init();
+ if (err)
+ goto ip6_route_fail;
+ err = ndisc_late_init();
+ if (err)
+ goto ndisc_late_fail;
+ err = ip6_flowlabel_init();
+ if (err)
+ goto ip6_flowlabel_fail;
+ err = ipv6_anycast_init();
+ if (err)
+ goto ipv6_anycast_fail;
+ err = addrconf_init();
+ if (err)
+ goto addrconf_fail;
+
+ /* Init v6 extension headers. */
+ err = ipv6_exthdrs_init();
+ if (err)
+ goto ipv6_exthdrs_fail;
+
+ err = ipv6_frag_init();
+ if (err)
+ goto ipv6_frag_fail;
+
+ /* Init v6 transport protocols. */
+ err = udpv6_init();
+ if (err)
+ goto udpv6_fail;
+
+ err = udplitev6_init();
+ if (err)
+ goto udplitev6_fail;
+
+ err = udpv6_offload_init();
+ if (err)
+ goto udpv6_offload_fail;
+
+ err = tcpv6_init();
+ if (err)
+ goto tcpv6_fail;
+
+ err = ipv6_packet_init();
+ if (err)
+ goto ipv6_packet_fail;
+
+ err = pingv6_init();
+ if (err)
+ goto pingv6_fail;
+
+ err = calipso_init();
+ if (err)
+ goto calipso_fail;
+
+ err = seg6_init();
+ if (err)
+ goto seg6_fail;
+
+ err = rpl_init();
+ if (err)
+ goto rpl_fail;
+
+ err = ioam6_init();
+ if (err)
+ goto ioam6_fail;
+
+ err = igmp6_late_init();
+ if (err)
+ goto igmp6_late_err;
+
+#ifdef CONFIG_SYSCTL
+ err = ipv6_sysctl_register();
+ if (err)
+ goto sysctl_fail;
+#endif
+
+ /* ensure that ipv6 stubs are visible only after ipv6 is ready */
+ wmb();
+ ipv6_stub = &ipv6_stub_impl;
+ ipv6_bpf_stub = &ipv6_bpf_stub_impl;
+out:
+ return err;
+
+#ifdef CONFIG_SYSCTL
+sysctl_fail:
+ igmp6_late_cleanup();
+#endif
+igmp6_late_err:
+ ioam6_exit();
+ioam6_fail:
+ rpl_exit();
+rpl_fail:
+ seg6_exit();
+seg6_fail:
+ calipso_exit();
+calipso_fail:
+ pingv6_exit();
+pingv6_fail:
+ ipv6_packet_cleanup();
+ipv6_packet_fail:
+ tcpv6_exit();
+tcpv6_fail:
+ udpv6_offload_exit();
+udpv6_offload_fail:
+ udplitev6_exit();
+udplitev6_fail:
+ udpv6_exit();
+udpv6_fail:
+ ipv6_frag_exit();
+ipv6_frag_fail:
+ ipv6_exthdrs_exit();
+ipv6_exthdrs_fail:
+ addrconf_cleanup();
+addrconf_fail:
+ ipv6_anycast_cleanup();
+ipv6_anycast_fail:
+ ip6_flowlabel_cleanup();
+ip6_flowlabel_fail:
+ ndisc_late_cleanup();
+ndisc_late_fail:
+ ip6_route_cleanup();
+ip6_route_fail:
+#ifdef CONFIG_PROC_FS
+ if6_proc_exit();
+proc_if6_fail:
+ ipv6_misc_proc_exit();
+proc_misc6_fail:
+ udplite6_proc_exit();
+proc_udplite6_fail:
+ raw6_proc_exit();
+proc_raw6_fail:
+#endif
+ ipv6_netfilter_fini();
+netfilter_fail:
+ igmp6_cleanup();
+igmp_fail:
+ ndisc_cleanup();
+ndisc_fail:
+ icmpv6_cleanup();
+icmp_fail:
+ ip6_mr_cleanup();
+ipmr_fail:
+ unregister_pernet_subsys(&inet6_net_ops);
+register_pernet_fail:
+ sock_unregister(PF_INET6);
+ rtnl_unregister_all(PF_INET6);
+out_sock_register_fail:
+ rawv6_exit();
+out_unregister_ping_proto:
+ proto_unregister(&pingv6_prot);
+out_unregister_raw_proto:
+ proto_unregister(&rawv6_prot);
+out_unregister_udplite_proto:
+ proto_unregister(&udplitev6_prot);
+out_unregister_udp_proto:
+ proto_unregister(&udpv6_prot);
+out_unregister_tcp_proto:
+ proto_unregister(&tcpv6_prot);
+ goto out;
+}
+module_init(inet6_init);
+
+MODULE_ALIAS_NETPROTO(PF_INET6);