| /* |
| * L2TPv3 IP encapsulation support |
| * |
| * Copyright (c) 2008,2009,2010 Katalix Systems Ltd |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #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 <net/sock.h> |
| #include <net/ip.h> |
| #include <net/icmp.h> |
| #include <net/udp.h> |
| #include <net/inet_common.h> |
| #include <net/inet_hashtables.h> |
| #include <net/tcp_states.h> |
| #include <net/protocol.h> |
| #include <net/xfrm.h> |
| |
| #include "l2tp_core.h" |
| |
| struct l2tp_ip_sock { |
| /* inet_sock has to be the first member of l2tp_ip_sock */ |
| struct inet_sock inet; |
| |
| u32 conn_id; |
| u32 peer_conn_id; |
| }; |
| |
| static DEFINE_RWLOCK(l2tp_ip_lock); |
| static struct hlist_head l2tp_ip_table; |
| static struct hlist_head l2tp_ip_bind_table; |
| |
| static inline struct l2tp_ip_sock *l2tp_ip_sk(const struct sock *sk) |
| { |
| return (struct l2tp_ip_sock *)sk; |
| } |
| |
| static struct sock *__l2tp_ip_bind_lookup(struct net *net, __be32 laddr, int dif, u32 tunnel_id) |
| { |
| struct sock *sk; |
| |
| sk_for_each_bound(sk, &l2tp_ip_bind_table) { |
| struct inet_sock *inet = inet_sk(sk); |
| struct l2tp_ip_sock *l2tp = l2tp_ip_sk(sk); |
| |
| if (l2tp == NULL) |
| continue; |
| |
| if ((l2tp->conn_id == tunnel_id) && |
| net_eq(sock_net(sk), net) && |
| !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) && |
| !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)) |
| goto found; |
| } |
| |
| sk = NULL; |
| found: |
| return sk; |
| } |
| |
| static inline struct sock *l2tp_ip_bind_lookup(struct net *net, __be32 laddr, int dif, u32 tunnel_id) |
| { |
| struct sock *sk = __l2tp_ip_bind_lookup(net, laddr, dif, tunnel_id); |
| if (sk) |
| sock_hold(sk); |
| |
| 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_ip_recv(struct sk_buff *skb) |
| { |
| struct net *net = dev_net(skb->dev); |
| struct sock *sk; |
| u32 session_id; |
| u32 tunnel_id; |
| unsigned char *ptr, *optr; |
| struct l2tp_session *session; |
| struct l2tp_tunnel *tunnel = NULL; |
| int length; |
| |
| /* Point to L2TP header */ |
| optr = ptr = skb->data; |
| |
| if (!pskb_may_pull(skb, 4)) |
| goto discard; |
| |
| 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_session_find(net, NULL, session_id); |
| if (session == NULL) |
| goto discard; |
| |
| tunnel = session->tunnel; |
| if (tunnel == NULL) |
| goto discard; |
| |
| /* Trace packet contents, if enabled */ |
| if (tunnel->debug & L2TP_MSG_DATA) { |
| length = min(32u, skb->len); |
| if (!pskb_may_pull(skb, length)) |
| goto discard; |
| |
| pr_debug("%s: ip recv\n", tunnel->name); |
| print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length); |
| } |
| |
| l2tp_recv_common(session, skb, ptr, optr, 0, skb->len, tunnel->recv_payload_hook); |
| |
| 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]); |
| tunnel = l2tp_tunnel_find(net, tunnel_id); |
| if (tunnel != NULL) |
| sk = tunnel->sock; |
| else { |
| struct iphdr *iph = (struct iphdr *) skb_network_header(skb); |
| |
| read_lock_bh(&l2tp_ip_lock); |
| sk = __l2tp_ip_bind_lookup(net, iph->daddr, 0, tunnel_id); |
| read_unlock_bh(&l2tp_ip_lock); |
| } |
| |
| if (sk == NULL) |
| goto discard; |
| |
| sock_hold(sk); |
| |
| if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
| goto discard_put; |
| |
| nf_reset(skb); |
| |
| return sk_receive_skb(sk, skb, 1); |
| |
| discard_put: |
| sock_put(sk); |
| |
| discard: |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| static int l2tp_ip_open(struct sock *sk) |
| { |
| /* Prevent autobind. We don't have ports. */ |
| inet_sk(sk)->inet_num = IPPROTO_L2TP; |
| |
| write_lock_bh(&l2tp_ip_lock); |
| sk_add_node(sk, &l2tp_ip_table); |
| write_unlock_bh(&l2tp_ip_lock); |
| |
| return 0; |
| } |
| |
| static void l2tp_ip_close(struct sock *sk, long timeout) |
| { |
| write_lock_bh(&l2tp_ip_lock); |
| hlist_del_init(&sk->sk_bind_node); |
| sk_del_node_init(sk); |
| write_unlock_bh(&l2tp_ip_lock); |
| sk_common_release(sk); |
| } |
| |
| static void l2tp_ip_destroy_sock(struct sock *sk) |
| { |
| struct sk_buff *skb; |
| struct l2tp_tunnel *tunnel = l2tp_sock_to_tunnel(sk); |
| |
| while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) |
| kfree_skb(skb); |
| |
| if (tunnel) { |
| l2tp_tunnel_closeall(tunnel); |
| sock_put(sk); |
| } |
| |
| sk_refcnt_debug_dec(sk); |
| } |
| |
| static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| struct sockaddr_l2tpip *addr = (struct sockaddr_l2tpip *) uaddr; |
| struct net *net = sock_net(sk); |
| int ret; |
| int chk_addr_ret; |
| |
| if (!sock_flag(sk, SOCK_ZAPPED)) |
| return -EINVAL; |
| if (addr_len < sizeof(struct sockaddr_l2tpip)) |
| return -EINVAL; |
| if (addr->l2tp_family != AF_INET) |
| return -EINVAL; |
| |
| ret = -EADDRINUSE; |
| read_lock_bh(&l2tp_ip_lock); |
| if (__l2tp_ip_bind_lookup(net, addr->l2tp_addr.s_addr, |
| sk->sk_bound_dev_if, addr->l2tp_conn_id)) |
| goto out_in_use; |
| |
| read_unlock_bh(&l2tp_ip_lock); |
| |
| lock_sock(sk); |
| if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_l2tpip)) |
| goto out; |
| |
| chk_addr_ret = inet_addr_type(net, addr->l2tp_addr.s_addr); |
| ret = -EADDRNOTAVAIL; |
| if (addr->l2tp_addr.s_addr && chk_addr_ret != RTN_LOCAL && |
| chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) |
| goto out; |
| |
| if (addr->l2tp_addr.s_addr) |
| inet->inet_rcv_saddr = inet->inet_saddr = addr->l2tp_addr.s_addr; |
| if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) |
| inet->inet_saddr = 0; /* Use device */ |
| sk_dst_reset(sk); |
| |
| l2tp_ip_sk(sk)->conn_id = addr->l2tp_conn_id; |
| |
| write_lock_bh(&l2tp_ip_lock); |
| sk_add_bind_node(sk, &l2tp_ip_bind_table); |
| sk_del_node_init(sk); |
| write_unlock_bh(&l2tp_ip_lock); |
| ret = 0; |
| sock_reset_flag(sk, SOCK_ZAPPED); |
| |
| out: |
| release_sock(sk); |
| |
| return ret; |
| |
| out_in_use: |
| read_unlock_bh(&l2tp_ip_lock); |
| |
| return ret; |
| } |
| |
| static int l2tp_ip_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
| { |
| struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *) uaddr; |
| int rc; |
| |
| if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ |
| return -EINVAL; |
| |
| if (addr_len < sizeof(*lsa)) |
| return -EINVAL; |
| |
| if (ipv4_is_multicast(lsa->l2tp_addr.s_addr)) |
| return -EINVAL; |
| |
| rc = ip4_datagram_connect(sk, uaddr, addr_len); |
| if (rc < 0) |
| return rc; |
| |
| lock_sock(sk); |
| |
| l2tp_ip_sk(sk)->peer_conn_id = lsa->l2tp_conn_id; |
| |
| write_lock_bh(&l2tp_ip_lock); |
| hlist_del_init(&sk->sk_bind_node); |
| sk_add_bind_node(sk, &l2tp_ip_bind_table); |
| write_unlock_bh(&l2tp_ip_lock); |
| |
| release_sock(sk); |
| return rc; |
| } |
| |
| static int l2tp_ip_disconnect(struct sock *sk, int flags) |
| { |
| if (sock_flag(sk, SOCK_ZAPPED)) |
| return 0; |
| |
| return udp_disconnect(sk, flags); |
| } |
| |
| static int l2tp_ip_getname(struct socket *sock, struct sockaddr *uaddr, |
| int *uaddr_len, int peer) |
| { |
| struct sock *sk = sock->sk; |
| struct inet_sock *inet = inet_sk(sk); |
| struct l2tp_ip_sock *lsk = l2tp_ip_sk(sk); |
| struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *)uaddr; |
| |
| memset(lsa, 0, sizeof(*lsa)); |
| lsa->l2tp_family = AF_INET; |
| if (peer) { |
| if (!inet->inet_dport) |
| return -ENOTCONN; |
| lsa->l2tp_conn_id = lsk->peer_conn_id; |
| lsa->l2tp_addr.s_addr = inet->inet_daddr; |
| } else { |
| __be32 addr = inet->inet_rcv_saddr; |
| if (!addr) |
| addr = inet->inet_saddr; |
| lsa->l2tp_conn_id = lsk->conn_id; |
| lsa->l2tp_addr.s_addr = addr; |
| } |
| *uaddr_len = sizeof(*lsa); |
| return 0; |
| } |
| |
| static int l2tp_ip_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; |
| } |
| |
| /* Userspace will call sendmsg() on the tunnel socket to send L2TP |
| * control frames. |
| */ |
| static int l2tp_ip_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len) |
| { |
| struct sk_buff *skb; |
| int rc; |
| struct inet_sock *inet = inet_sk(sk); |
| struct rtable *rt = NULL; |
| struct flowi4 *fl4; |
| int connected = 0; |
| __be32 daddr; |
| |
| lock_sock(sk); |
| |
| rc = -ENOTCONN; |
| if (sock_flag(sk, SOCK_DEAD)) |
| goto out; |
| |
| /* Get and verify the address. */ |
| if (msg->msg_name) { |
| DECLARE_SOCKADDR(struct sockaddr_l2tpip *, lip, msg->msg_name); |
| rc = -EINVAL; |
| if (msg->msg_namelen < sizeof(*lip)) |
| goto out; |
| |
| if (lip->l2tp_family != AF_INET) { |
| rc = -EAFNOSUPPORT; |
| if (lip->l2tp_family != AF_UNSPEC) |
| goto out; |
| } |
| |
| daddr = lip->l2tp_addr.s_addr; |
| } else { |
| rc = -EDESTADDRREQ; |
| if (sk->sk_state != TCP_ESTABLISHED) |
| goto out; |
| |
| daddr = inet->inet_daddr; |
| connected = 1; |
| } |
| |
| /* Allocate a socket buffer */ |
| rc = -ENOMEM; |
| skb = sock_wmalloc(sk, 2 + NET_SKB_PAD + sizeof(struct iphdr) + |
| 4 + len, 0, GFP_KERNEL); |
| if (!skb) |
| goto error; |
| |
| /* Reserve space for headers, putting IP header on 4-byte boundary. */ |
| skb_reserve(skb, 2 + NET_SKB_PAD); |
| skb_reset_network_header(skb); |
| skb_reserve(skb, sizeof(struct iphdr)); |
| skb_reset_transport_header(skb); |
| |
| /* Insert 0 session_id */ |
| *((__be32 *) skb_put(skb, 4)) = 0; |
| |
| /* Copy user data into skb */ |
| rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
| if (rc < 0) { |
| kfree_skb(skb); |
| goto error; |
| } |
| |
| fl4 = &inet->cork.fl.u.ip4; |
| if (connected) |
| rt = (struct rtable *) __sk_dst_check(sk, 0); |
| |
| rcu_read_lock(); |
| if (rt == NULL) { |
| const struct ip_options_rcu *inet_opt; |
| |
| inet_opt = rcu_dereference(inet->inet_opt); |
| |
| /* Use correct destination address if we have options. */ |
| if (inet_opt && inet_opt->opt.srr) |
| daddr = inet_opt->opt.faddr; |
| |
| /* If this fails, retransmit mechanism of transport layer will |
| * keep trying until route appears or the connection times |
| * itself out. |
| */ |
| rt = ip_route_output_ports(sock_net(sk), fl4, sk, |
| daddr, inet->inet_saddr, |
| inet->inet_dport, inet->inet_sport, |
| sk->sk_protocol, RT_CONN_FLAGS(sk), |
| sk->sk_bound_dev_if); |
| if (IS_ERR(rt)) |
| goto no_route; |
| if (connected) { |
| sk_setup_caps(sk, &rt->dst); |
| } else { |
| skb_dst_set(skb, &rt->dst); |
| goto xmit; |
| } |
| } |
| |
| /* We dont need to clone dst here, it is guaranteed to not disappear. |
| * __dev_xmit_skb() might force a refcount if needed. |
| */ |
| skb_dst_set_noref(skb, &rt->dst); |
| |
| xmit: |
| /* Queue the packet to IP for output */ |
| rc = ip_queue_xmit(sk, skb, &inet->cork.fl); |
| rcu_read_unlock(); |
| |
| error: |
| if (rc >= 0) |
| rc = len; |
| |
| out: |
| release_sock(sk); |
| return rc; |
| |
| no_route: |
| rcu_read_unlock(); |
| IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); |
| kfree_skb(skb); |
| rc = -EHOSTUNREACH; |
| goto out; |
| } |
| |
| static int l2tp_ip_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
| size_t len, int noblock, int flags, int *addr_len) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| size_t copied = 0; |
| int err = -EOPNOTSUPP; |
| DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
| struct sk_buff *skb; |
| |
| if (flags & MSG_OOB) |
| goto out; |
| |
| skb = skb_recv_datagram(sk, flags, noblock, &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 (sin) { |
| sin->sin_family = AF_INET; |
| sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
| sin->sin_port = 0; |
| memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); |
| *addr_len = sizeof(*sin); |
| } |
| if (inet->cmsg_flags) |
| ip_cmsg_recv(msg, skb); |
| if (flags & MSG_TRUNC) |
| copied = skb->len; |
| done: |
| skb_free_datagram(sk, skb); |
| out: |
| return err ? err : copied; |
| } |
| |
| static struct proto l2tp_ip_prot = { |
| .name = "L2TP/IP", |
| .owner = THIS_MODULE, |
| .init = l2tp_ip_open, |
| .close = l2tp_ip_close, |
| .bind = l2tp_ip_bind, |
| .connect = l2tp_ip_connect, |
| .disconnect = l2tp_ip_disconnect, |
| .ioctl = udp_ioctl, |
| .destroy = l2tp_ip_destroy_sock, |
| .setsockopt = ip_setsockopt, |
| .getsockopt = ip_getsockopt, |
| .sendmsg = l2tp_ip_sendmsg, |
| .recvmsg = l2tp_ip_recvmsg, |
| .backlog_rcv = l2tp_ip_backlog_recv, |
| .hash = inet_hash, |
| .unhash = inet_unhash, |
| .obj_size = sizeof(struct l2tp_ip_sock), |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_ip_setsockopt, |
| .compat_getsockopt = compat_ip_getsockopt, |
| #endif |
| }; |
| |
| static const struct proto_ops l2tp_ip_ops = { |
| .family = PF_INET, |
| .owner = THIS_MODULE, |
| .release = inet_release, |
| .bind = inet_bind, |
| .connect = inet_dgram_connect, |
| .socketpair = sock_no_socketpair, |
| .accept = sock_no_accept, |
| .getname = l2tp_ip_getname, |
| .poll = datagram_poll, |
| .ioctl = inet_ioctl, |
| .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, |
| .sendpage = sock_no_sendpage, |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_sock_common_setsockopt, |
| .compat_getsockopt = compat_sock_common_getsockopt, |
| #endif |
| }; |
| |
| static struct inet_protosw l2tp_ip_protosw = { |
| .type = SOCK_DGRAM, |
| .protocol = IPPROTO_L2TP, |
| .prot = &l2tp_ip_prot, |
| .ops = &l2tp_ip_ops, |
| }; |
| |
| static struct net_protocol l2tp_ip_protocol __read_mostly = { |
| .handler = l2tp_ip_recv, |
| .netns_ok = 1, |
| }; |
| |
| static int __init l2tp_ip_init(void) |
| { |
| int err; |
| |
| pr_info("L2TP IP encapsulation support (L2TPv3)\n"); |
| |
| err = proto_register(&l2tp_ip_prot, 1); |
| if (err != 0) |
| goto out; |
| |
| err = inet_add_protocol(&l2tp_ip_protocol, IPPROTO_L2TP); |
| if (err) |
| goto out1; |
| |
| inet_register_protosw(&l2tp_ip_protosw); |
| return 0; |
| |
| out1: |
| proto_unregister(&l2tp_ip_prot); |
| out: |
| return err; |
| } |
| |
| static void __exit l2tp_ip_exit(void) |
| { |
| inet_unregister_protosw(&l2tp_ip_protosw); |
| inet_del_protocol(&l2tp_ip_protocol, IPPROTO_L2TP); |
| proto_unregister(&l2tp_ip_prot); |
| } |
| |
| module_init(l2tp_ip_init); |
| module_exit(l2tp_ip_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("James Chapman <jchapman@katalix.com>"); |
| MODULE_DESCRIPTION("L2TP over IP"); |
| MODULE_VERSION("1.0"); |
| |
| /* Use the value of SOCK_DGRAM (2) directory, because __stringify doesn't like |
| * enums |
| */ |
| MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET, 2, IPPROTO_L2TP); |