// SPDX-License-Identifier: GPL-2.0-or-later
/* L2TPv3 IP encapsulation support for IPv6
*
* Copyright (c) 2012 Katalix Systems Ltd
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/icmp.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/random.h>
#include <linux/socket.h>
#include <linux/l2tp.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <net/sock.h>
#include <net/ip.h>
#include <net/icmp.h>
#include <net/udp.h>
#include <net/inet_common.h>
#include <net/tcp_states.h>
#include <net/protocol.h>
#include <net/xfrm.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/transp_v6.h>
#include <net/addrconf.h>
#include <net/ip6_route.h>
#include "l2tp_core.h"
/* per-net private data for this module */
static unsigned int l2tp_ip6_net_id;
struct l2tp_ip6_net {
rwlock_t l2tp_ip6_lock;
struct hlist_head l2tp_ip6_table;
struct hlist_head l2tp_ip6_bind_table;
};
struct l2tp_ip6_sock {
/* inet_sock has to be the first member of l2tp_ip6_sock */
struct inet_sock inet;
u32 conn_id;
u32 peer_conn_id;
struct ipv6_pinfo inet6;
};
static struct l2tp_ip6_sock *l2tp_ip6_sk(const struct sock *sk)
{
return (struct l2tp_ip6_sock *)sk;
}
static struct l2tp_ip6_net *l2tp_ip6_pernet(const struct net *net)
{
return net_generic(net, l2tp_ip6_net_id);
}
static struct sock *__l2tp_ip6_bind_lookup(const struct net *net,
const struct in6_addr *laddr,
const struct in6_addr *raddr,
int dif, u32 tunnel_id)
{
struct l2tp_ip6_net *pn = l2tp_ip6_pernet(net);
struct sock *sk;
sk_for_each_bound(sk, &pn->l2tp_ip6_bind_table) {
const struct in6_addr *sk_laddr = inet6_rcv_saddr(sk);
const struct in6_addr *sk_raddr = &sk->sk_v6_daddr;
const struct l2tp_ip6_sock *l2tp = l2tp_ip6_sk(sk);
int bound_dev_if;
if (!net_eq(sock_net(sk), net))
continue;
bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
if (bound_dev_if && dif && bound_dev_if != dif)
continue;
if (sk_laddr && !ipv6_addr_any(sk_laddr) &&
!ipv6_addr_any(laddr) && !ipv6_addr_equal(sk_laddr, laddr))
continue;
if (!ipv6_addr_any(sk_raddr) && raddr &&
!ipv6_addr_any(raddr) && !ipv6_addr_equal(sk_raddr, raddr))
continue;
if (l2tp->conn_id != tunnel_id)
continue;
goto found;
}
sk = NULL;
found:
return sk;
}
/* When processing receive frames, there are two cases to
* consider. Data frames consist of a non-zero session-id and an
* optional cookie. Control frames consist of a regular L2TP header
* preceded by 32-bits of zeros.
*
* L2TPv3 Session Header Over IP
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Session ID |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Cookie (optional, maximum 64 bits)...
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* L2TPv3 Control Message Header Over IP
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | (32 bits of zeros) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |T|L|x|x|S|x|x|x|x|x|x|x| Ver | Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Control Connection ID |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Ns | Nr |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* All control frames are passed to userspace.
*/
static int l2tp_ip6_recv(struct sk_buff *skb)
{
struct net *net = dev_net(skb->dev);
struct l2tp_ip6_net *pn;
struct sock *sk;
u32 session_id;
u32 tunnel_id;
unsigned char *ptr, *optr;
struct l2tp_session *session;
struct l2tp_tunnel *tunnel = NULL;
struct ipv6hdr *iph;
pn = l2tp_ip6_pernet(net);
if (!pskb_may_pull(skb, 4))
goto discard;
/* Point to L2TP header */
optr = skb->data;
ptr = skb->data;
session_id = ntohl(*((__be32 *)ptr));
ptr += 4;
/* RFC3931: L2TP/IP packets have the first 4 bytes containing
* the session_id. If it is 0, the packet is a L2TP control
* frame and the session_id value can be discarded.
*/
if (session_id == 0) {
__skb_pull(skb, 4);
goto pass_up;
}
/* Ok, this is a data packet. Lookup the session. */
session = l2tp_v3_session_get(net, NULL, session_id);
if (!session)
goto discard;
tunnel = session->tunnel;
if (!tunnel)
goto discard_sess;
if (l2tp_v3_ensure_opt_in_linear(session, skb, &ptr, &optr))
goto discard_sess;
l2tp_recv_common(session, skb, ptr, optr, 0, skb->len);
l2tp_session_put(session);
return 0;
pass_up:
/* Get the tunnel_id from the L2TP header */
if (!pskb_may_pull(skb, 12))
goto discard;
if ((skb->data[0] & 0xc0) != 0xc0)
goto discard;
tunnel_id = ntohl(*(__be32 *)&skb->data[4]);
iph = ipv6_hdr(skb);
read_lock_bh(&pn->l2tp_ip6_lock);
sk = __l2tp_ip6_bind_lookup(net, &iph->daddr, &iph->saddr,
inet6_iif(skb), tunnel_id);
if (!sk) {
read_unlock_bh(&pn->l2tp_ip6_lock);
goto discard;
}
sock_hold(sk);
read_unlock_bh(&pn->l2tp_ip6_lock);
if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
goto discard_put;
nf_reset_ct(skb);
return sk_receive_skb(sk, skb, 1);
discard_sess:
l2tp_session_put(session);
goto discard;
discard_put:
sock_put(sk);
discard:
kfree_skb(skb);
return 0;
}
static int l2tp_ip6_hash(struct sock *sk)
{
struct l2tp_ip6_net *pn = l2tp_ip6_pernet(sock_net(sk));
if (sk_unhashed(sk)) {
write_lock_bh(&pn->l2tp_ip6_lock);
sk_add_node(sk, &pn->l2tp_ip6_table);
write_unlock_bh(&pn->l2tp_ip6_lock);
}
return 0;
}
static void l2tp_ip6_unhash(struct sock *sk)
{
struct l2tp_ip6_net *pn = l2tp_ip6_pernet(sock_net(sk));
if (sk_unhashed(sk))
return;
write_lock_bh(&pn->l2tp_ip6_lock);
sk_del_node_init(sk);
write_unlock_bh(&pn->l2tp_ip6_lock);
}
static int l2tp_ip6_open(struct sock *sk)
{
/* Prevent autobind. We don't have ports. */
inet_sk(sk)->inet_num = IPPROTO_L2TP;
l2tp_ip6_hash(sk);
return 0;
}
static void l2tp_ip6_close(struct sock *sk, long timeout)
{
struct l2tp_ip6_net *pn = l2tp_ip6_pernet(sock_net(sk));
write_lock_bh(&pn->l2tp_ip6_lock);
hlist_del_init(&sk->sk_bind_node);
sk_del_node_init(sk);
write_unlock_bh(&pn->l2tp_ip6_lock);
sk_common_release(sk);
}
static void l2tp_ip6_destroy_sock(struct sock *sk)
{
struct l2tp_tunnel *tunnel;
lock_sock(sk);
ip6_flush_pending_frames(sk);
release_sock(sk);
tunnel = l2tp_sk_to_tunnel(sk);
if (tunnel) {
l2tp_tunnel_delete(tunnel);
l2tp_tunnel_put(tunnel);
}
}
static int l2tp_ip6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
struct inet_sock *inet = inet_sk(sk);
struct ipv6_pinfo *np = inet6_sk(sk);
struct sockaddr_l2tpip6 *addr = (struct sockaddr_l2tpip6 *)uaddr;
struct net *net = sock_net(sk);
struct l2tp_ip6_net *pn;
__be32 v4addr = 0;
int bound_dev_if;
int addr_type;
int err;
pn = l2tp_ip6_pernet(net);
if (addr->l2tp_family != AF_INET6)
return -EINVAL;
if (addr_len < sizeof(*addr))
return -EINVAL;
addr_type = ipv6_addr_type(&addr->l2tp_addr);
/* l2tp_ip6 sockets are IPv6 only */
if (addr_type == IPV6_ADDR_MAPPED)
return -EADDRNOTAVAIL;
/* L2TP is point-point, not multicast */
if (addr_type & IPV6_ADDR_MULTICAST)
return -EADDRNOTAVAIL;
lock_sock(sk);
err = -EINVAL;
if (!sock_flag(sk, SOCK_ZAPPED))
goto out_unlock;
if (sk->sk_state != TCP_CLOSE)
goto out_unlock;
bound_dev_if = sk->sk_bound_dev_if;
/* Check if the address belongs to the host. */
rcu_read_lock();
if (addr_type != IPV6_ADDR_ANY) {
struct net_device *dev = NULL;
if (addr_type & IPV6_ADDR_LINKLOCAL) {
if (addr->l2tp_scope_id)
bound_dev_if = addr->l2tp_scope_id;
/* Binding to link-local address requires an
* interface.
*/
if (!bound_dev_if)
goto out_unlock_rcu;
err = -ENODEV;
dev = dev_get_by_index_rcu(sock_net(sk), bound_dev_if);
if (!dev)
goto out_unlock_rcu;
}
/* ipv4 addr of the socket is invalid. Only the
* unspecified and mapped address have a v4 equivalent.
*/
v4addr = LOOPBACK4_IPV6;
err = -EADDRNOTAVAIL;
if (!ipv6_chk_addr(sock_net(sk), &addr->l2tp_addr, dev, 0))
goto out_unlock_rcu;
}
rcu_read_unlock();
write_lock_bh(&pn->l2tp_ip6_lock);
if (__l2tp_ip6_bind_lookup(net, &addr->l2tp_addr, NULL, bound_dev_if,
addr->l2tp_conn_id)) {
write_unlock_bh(&pn->l2tp_ip6_lock);
err = -EADDRINUSE;
goto out_unlock;
}
inet->inet_saddr = v4addr;
inet->inet_rcv_saddr = v4addr;
sk->sk_bound_dev_if = bound_dev_if;
sk->sk_v6_rcv_saddr = addr->l2tp_addr;
np->saddr = addr->l2tp_addr;
l2tp_ip6_sk(sk)->conn_id = addr->l2tp_conn_id;
sk_add_bind_node(sk, &pn->l2tp_ip6_bind_table);
sk_del_node_init(sk);
write_unlock_bh(&pn->l2tp_ip6_lock);
sock_reset_flag(sk, SOCK_ZAPPED);
release_sock(sk);
return 0;
out_unlock_rcu:
rcu_read_unlock();
out_unlock:
release_sock(sk);
return err;
}
static int l2tp_ip6_connect(struct sock *sk, struct sockaddr *uaddr,
int addr_len)
{
struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *)uaddr;
struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
struct in6_addr *daddr;
int addr_type;
int rc;
struct l2tp_ip6_net *pn;
if (addr_len < sizeof(*lsa))
return -EINVAL;
if (usin->sin6_family != AF_INET6)
return -EINVAL;
addr_type = ipv6_addr_type(&usin->sin6_addr);
if (addr_type & IPV6_ADDR_MULTICAST)
return -EINVAL;
if (addr_type & IPV6_ADDR_MAPPED) {
daddr = &usin->sin6_addr;
if (ipv4_is_multicast(daddr->s6_addr32[3]))
return -EINVAL;
}
lock_sock(sk);
/* Must bind first - autobinding does not work */
if (sock_flag(sk, SOCK_ZAPPED)) {
rc = -EINVAL;
goto out_sk;
}
rc = __ip6_datagram_connect(sk, uaddr, addr_len);
if (rc < 0)
goto out_sk;
l2tp_ip6_sk(sk)->peer_conn_id = lsa->l2tp_conn_id;
pn = l2tp_ip6_pernet(sock_net(sk));
write_lock_bh(&pn->l2tp_ip6_lock);
hlist_del_init(&sk->sk_bind_node);
sk_add_bind_node(sk, &pn->l2tp_ip6_bind_table);
write_unlock_bh(&pn->l2tp_ip6_lock);
out_sk:
release_sock(sk);
return rc;
}
static int l2tp_ip6_disconnect(struct sock *sk, int flags)
{
if (sock_flag(sk, SOCK_ZAPPED))
return 0;
return __udp_disconnect(sk, flags);
}
static int l2tp_ip6_getname(struct socket *sock, struct sockaddr *uaddr,
int peer)
{
struct sockaddr_l2tpip6 *lsa = (struct sockaddr_l2tpip6 *)uaddr;
struct sock *sk = sock->sk;
struct ipv6_pinfo *np = inet6_sk(sk);
struct l2tp_ip6_sock *lsk = l2tp_ip6_sk(sk);
lsa->l2tp_family = AF_INET6;
lsa->l2tp_flowinfo = 0;
lsa->l2tp_scope_id = 0;
lsa->l2tp_unused = 0;
if (peer) {
if (!lsk->peer_conn_id)
return -ENOTCONN;
lsa->l2tp_conn_id = lsk->peer_conn_id;
lsa->l2tp_addr = sk->sk_v6_daddr;
if (inet6_test_bit(SNDFLOW, sk))
lsa->l2tp_flowinfo = np->flow_label;
} else {
if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
lsa->l2tp_addr = np->saddr;
else
lsa->l2tp_addr = sk->sk_v6_rcv_saddr;
lsa->l2tp_conn_id = lsk->conn_id;
}
if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL)
lsa->l2tp_scope_id = READ_ONCE(sk->sk_bound_dev_if);
return sizeof(*lsa);
}
static int l2tp_ip6_backlog_recv(struct sock *sk, struct sk_buff *skb)
{
int rc;
/* Charge it to the socket, dropping if the queue is full. */
rc = sock_queue_rcv_skb(sk, skb);
if (rc < 0)
goto drop;
return 0;
drop:
IP_INC_STATS(sock_net(sk), IPSTATS_MIB_INDISCARDS);
kfree_skb(skb);
return -1;
}
static int l2tp_ip6_push_pending_frames(struct sock *sk)
{
struct sk_buff *skb;
__be32 *transhdr = NULL;
int err = 0;
skb = skb_peek(&sk->sk_write_queue);
if (!skb)
goto out;
transhdr = (__be32 *)skb_transport_header(skb);
*transhdr = 0;
err = ip6_push_pending_frames(sk);
out:
return err;
}
/* Userspace will call sendmsg() on the tunnel socket to send L2TP
* control frames.
*/
static int l2tp_ip6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
{
struct ipv6_txoptions opt_space;
DECLARE_SOCKADDR(struct sockaddr_l2tpip6 *, lsa, msg->msg_name);
struct in6_addr *daddr, *final_p, final;
struct ipv6_pinfo *np = inet6_sk(sk);
struct ipv6_txoptions *opt_to_free = NULL;
struct ipv6_txoptions *opt = NULL;
struct ip6_flowlabel *flowlabel = NULL;
struct dst_entry *dst = NULL;
struct flowi6 fl6;
struct ipcm6_cookie ipc6;
int addr_len = msg->msg_namelen;
int transhdrlen = 4; /* zero session-id */
int ulen;
int err;
/* Rough check on arithmetic overflow,
* better check is made in ip6_append_data().
*/
if (len > INT_MAX - transhdrlen)
return -EMSGSIZE;
/* Mirror BSD error message compatibility */
if (msg->msg_flags & MSG_OOB)
return -EOPNOTSUPP;
/* Get and verify the address */
memset(&fl6, 0, sizeof(fl6));
fl6.flowi6_mark = READ_ONCE(sk->sk_mark);
fl6.flowi6_uid = sk->sk_uid;
ipcm6_init(&ipc6);
if (lsa) {
if (addr_len < SIN6_LEN_RFC2133)
return -EINVAL;
if (lsa->l2tp_family && lsa->l2tp_family != AF_INET6)
return -EAFNOSUPPORT;
daddr = &lsa->l2tp_addr;
if (inet6_test_bit(SNDFLOW, sk)) {
fl6.flowlabel = lsa->l2tp_flowinfo & IPV6_FLOWINFO_MASK;
if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) {
flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
if (IS_ERR(flowlabel))
return -EINVAL;
}
}
/* Otherwise it will be difficult to maintain
* sk->sk_dst_cache.
*/
if (sk->sk_state == TCP_ESTABLISHED &&
ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
daddr = &sk->sk_v6_daddr;
if (addr_len >= sizeof(struct sockaddr_in6) &&
lsa->l2tp_scope_id &&
ipv6_addr_type(daddr) & IPV6_ADDR_LINKLOCAL)
fl6.flowi6_oif = lsa->l2tp_scope_id;
} else {
if (sk->sk_state != TCP_ESTABLISHED)
return -EDESTADDRREQ;
daddr = &sk->sk_v6_daddr;
fl6.flowlabel = np->flow_label;
}
if (fl6.flowi6_oif == 0)
fl6.flowi6_oif = READ_ONCE(sk->sk_bound_dev_if);
if (msg->msg_controllen) {
opt = &opt_space;
memset(opt, 0, sizeof(struct ipv6_txoptions));
opt->tot_len = sizeof(struct ipv6_txoptions);
ipc6.opt = opt;
err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
if (err < 0) {
fl6_sock_release(flowlabel);
return err;
}
if ((fl6.flowlabel & IPV6_FLOWLABEL_MASK) && !flowlabel) {
flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
if (IS_ERR(flowlabel))
return -EINVAL;
}
if (!(opt->opt_nflen | opt->opt_flen))
opt = NULL;
}
if (!opt) {
opt = txopt_get(np);
opt_to_free = opt;
}
if (flowlabel)
opt = fl6_merge_options(&opt_space, flowlabel, opt);
opt = ipv6_fixup_options(&opt_space, opt);
ipc6.opt = opt;
fl6.flowi6_proto = sk->sk_protocol;
if (!ipv6_addr_any(daddr))
fl6.daddr = *daddr;
else
fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
fl6.saddr = np->saddr;
final_p = fl6_update_dst(&fl6, opt, &final);
if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
fl6.flowi6_oif = READ_ONCE(np->mcast_oif);
else if (!fl6.flowi6_oif)
fl6.flowi6_oif = READ_ONCE(np->ucast_oif);
security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
if (ipc6.tclass < 0)
ipc6.tclass = np->tclass;
fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
if (IS_ERR(dst)) {
err = PTR_ERR(dst);
goto out;
}
if (ipc6.hlimit < 0)
ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
if (ipc6.dontfrag < 0)
ipc6.dontfrag = inet6_test_bit(DONTFRAG, sk);
if (msg->msg_flags & MSG_CONFIRM)
goto do_confirm;
back_from_confirm:
lock_sock(sk);
ulen = len + (skb_queue_empty(&sk->sk_write_queue) ? transhdrlen : 0);
err = ip6_append_data(sk, ip_generic_getfrag, msg,
ulen, transhdrlen, &ipc6,
&fl6, dst_rt6_info(dst),
msg->msg_flags);
if (err)
ip6_flush_pending_frames(sk);
else if (!(msg->msg_flags & MSG_MORE))
err = l2tp_ip6_push_pending_frames(sk);
release_sock(sk);
done:
dst_release(dst);
out:
fl6_sock_release(flowlabel);
txopt_put(opt_to_free);
return err < 0 ? err : len;
do_confirm:
if (msg->msg_flags & MSG_PROBE)
dst_confirm_neigh(dst, &fl6.daddr);
if (!(msg->msg_flags & MSG_PROBE) || len)
goto back_from_confirm;
err = 0;
goto done;
}
static int l2tp_ip6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
int flags, int *addr_len)
{
struct ipv6_pinfo *np = inet6_sk(sk);
DECLARE_SOCKADDR(struct sockaddr_l2tpip6 *, lsa, msg->msg_name);
size_t copied = 0;
int err = -EOPNOTSUPP;
struct sk_buff *skb;
if (flags & MSG_OOB)
goto out;
if (flags & MSG_ERRQUEUE)
return ipv6_recv_error(sk, msg, len, addr_len);
skb = skb_recv_datagram(sk, flags, &err);
if (!skb)
goto out;
copied = skb->len;
if (len < copied) {
msg->msg_flags |= MSG_TRUNC;
copied = len;
}
err = skb_copy_datagram_msg(skb, 0, msg, copied);
if (err)
goto done;
sock_recv_timestamp(msg, sk, skb);
/* Copy the address. */
if (lsa) {
lsa->l2tp_family = AF_INET6;
lsa->l2tp_unused = 0;
lsa->l2tp_addr = ipv6_hdr(skb)->saddr;
lsa->l2tp_flowinfo = 0;
lsa->l2tp_scope_id = 0;
lsa->l2tp_conn_id = 0;
if (ipv6_addr_type(&lsa->l2tp_addr) & IPV6_ADDR_LINKLOCAL)
lsa->l2tp_scope_id = inet6_iif(skb);
*addr_len = sizeof(*lsa);
}
if (np->rxopt.all)
ip6_datagram_recv_ctl(sk, msg, skb);
if (flags & MSG_TRUNC)
copied = skb->len;
done:
skb_free_datagram(sk, skb);
out:
return err ? err : copied;
}
static struct proto l2tp_ip6_prot = {
.name = "L2TP/IPv6",
.owner = THIS_MODULE,
.init = l2tp_ip6_open,
.close = l2tp_ip6_close,
.bind = l2tp_ip6_bind,
.connect = l2tp_ip6_connect,
.disconnect = l2tp_ip6_disconnect,
.ioctl = l2tp_ioctl,
.destroy = l2tp_ip6_destroy_sock,
.setsockopt = ipv6_setsockopt,
.getsockopt = ipv6_getsockopt,
.sendmsg = l2tp_ip6_sendmsg,
.recvmsg = l2tp_ip6_recvmsg,
.backlog_rcv = l2tp_ip6_backlog_recv,
.hash = l2tp_ip6_hash,
.unhash = l2tp_ip6_unhash,
.obj_size = sizeof(struct l2tp_ip6_sock),
.ipv6_pinfo_offset = offsetof(struct l2tp_ip6_sock, inet6),
};
static const struct proto_ops l2tp_ip6_ops = {
.family = PF_INET6,
.owner = THIS_MODULE,
.release = inet6_release,
.bind = inet6_bind,
.connect = inet_dgram_connect,
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.getname = l2tp_ip6_getname,
.poll = datagram_poll,
.ioctl = inet6_ioctl,
.gettstamp = sock_gettstamp,
.listen = sock_no_listen,
.shutdown = inet_shutdown,
.setsockopt = sock_common_setsockopt,
.getsockopt = sock_common_getsockopt,
.sendmsg = inet_sendmsg,
.recvmsg = sock_common_recvmsg,
.mmap = sock_no_mmap,
#ifdef CONFIG_COMPAT
.compat_ioctl = inet6_compat_ioctl,
#endif
};
static struct inet_protosw l2tp_ip6_protosw = {
.type = SOCK_DGRAM,
.protocol = IPPROTO_L2TP,
.prot = &l2tp_ip6_prot,
.ops = &l2tp_ip6_ops,
};
static struct inet6_protocol l2tp_ip6_protocol __read_mostly = {
.handler = l2tp_ip6_recv,
};
static __net_init int l2tp_ip6_init_net(struct net *net)
{
struct l2tp_ip6_net *pn = net_generic(net, l2tp_ip6_net_id);
rwlock_init(&pn->l2tp_ip6_lock);
INIT_HLIST_HEAD(&pn->l2tp_ip6_table);
INIT_HLIST_HEAD(&pn->l2tp_ip6_bind_table);
return 0;
}
static __net_exit void l2tp_ip6_exit_net(struct net *net)
{
struct l2tp_ip6_net *pn = l2tp_ip6_pernet(net);
write_lock_bh(&pn->l2tp_ip6_lock);
WARN_ON_ONCE(hlist_count_nodes(&pn->l2tp_ip6_table) != 0);
WARN_ON_ONCE(hlist_count_nodes(&pn->l2tp_ip6_bind_table) != 0);
write_unlock_bh(&pn->l2tp_ip6_lock);
}
static struct pernet_operations l2tp_ip6_net_ops = {
.init = l2tp_ip6_init_net,
.exit = l2tp_ip6_exit_net,
.id = &l2tp_ip6_net_id,
.size = sizeof(struct l2tp_ip6_net),
};
static int __init l2tp_ip6_init(void)
{
int err;
pr_info("L2TP IP encapsulation support for IPv6 (L2TPv3)\n");
err = register_pernet_device(&l2tp_ip6_net_ops);
if (err)
goto out;
err = proto_register(&l2tp_ip6_prot, 1);
if (err != 0)
goto out1;
err = inet6_add_protocol(&l2tp_ip6_protocol, IPPROTO_L2TP);
if (err)
goto out2;
inet6_register_protosw(&l2tp_ip6_protosw);
return 0;
out2:
proto_unregister(&l2tp_ip6_prot);
out1:
unregister_pernet_device(&l2tp_ip6_net_ops);
out:
return err;
}
static void __exit l2tp_ip6_exit(void)
{
inet6_unregister_protosw(&l2tp_ip6_protosw);
inet6_del_protocol(&l2tp_ip6_protocol, IPPROTO_L2TP);
proto_unregister(&l2tp_ip6_prot);
unregister_pernet_device(&l2tp_ip6_net_ops);
}
module_init(l2tp_ip6_init);
module_exit(l2tp_ip6_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Chris Elston <[email protected]>");
MODULE_DESCRIPTION("L2TP IP encapsulation for IPv6");
MODULE_VERSION("1.0");
/* Use the values of SOCK_DGRAM (2) as type and IPPROTO_L2TP (115) as protocol,
* because __stringify doesn't like enums
*/
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 115, 2);
MODULE_ALIAS_NET_PF_PROTO(PF_INET6, 115);
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