![stephen hemminger](/assets/img/avatar_default.png)
When creating a IP encapsulated tunnel the necessary l2tp module should be loaded. It already works for UDP encapsulation, it just doesn't work for direct IP encap. Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David S. Miller <davem@davemloft.net>
659 lines
16 KiB
C
659 lines
16 KiB
C
/*
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* L2TPv3 IP encapsulation support
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*
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* Copyright (c) 2008,2009,2010 Katalix Systems Ltd
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/icmp.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/random.h>
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#include <linux/socket.h>
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#include <linux/l2tp.h>
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#include <linux/in.h>
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#include <net/sock.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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#include <net/udp.h>
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#include <net/inet_common.h>
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#include <net/inet_hashtables.h>
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#include <net/tcp_states.h>
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#include <net/protocol.h>
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#include <net/xfrm.h>
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#include "l2tp_core.h"
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struct l2tp_ip_sock {
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/* inet_sock has to be the first member of l2tp_ip_sock */
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struct inet_sock inet;
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u32 conn_id;
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u32 peer_conn_id;
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};
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static DEFINE_RWLOCK(l2tp_ip_lock);
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static struct hlist_head l2tp_ip_table;
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static struct hlist_head l2tp_ip_bind_table;
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static inline struct l2tp_ip_sock *l2tp_ip_sk(const struct sock *sk)
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{
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return (struct l2tp_ip_sock *)sk;
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}
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static struct sock *__l2tp_ip_bind_lookup(struct net *net, __be32 laddr, int dif, u32 tunnel_id)
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{
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struct sock *sk;
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sk_for_each_bound(sk, &l2tp_ip_bind_table) {
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struct inet_sock *inet = inet_sk(sk);
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struct l2tp_ip_sock *l2tp = l2tp_ip_sk(sk);
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if (l2tp == NULL)
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continue;
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if ((l2tp->conn_id == tunnel_id) &&
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net_eq(sock_net(sk), net) &&
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!(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
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!(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
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goto found;
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}
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sk = NULL;
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found:
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return sk;
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}
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static inline struct sock *l2tp_ip_bind_lookup(struct net *net, __be32 laddr, int dif, u32 tunnel_id)
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{
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struct sock *sk = __l2tp_ip_bind_lookup(net, laddr, dif, tunnel_id);
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if (sk)
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sock_hold(sk);
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return sk;
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}
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/* When processing receive frames, there are two cases to
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* consider. Data frames consist of a non-zero session-id and an
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* optional cookie. Control frames consist of a regular L2TP header
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* preceded by 32-bits of zeros.
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*
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* L2TPv3 Session Header Over IP
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Session ID |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Cookie (optional, maximum 64 bits)...
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* L2TPv3 Control Message Header Over IP
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | (32 bits of zeros) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |T|L|x|x|S|x|x|x|x|x|x|x| Ver | Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Control Connection ID |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Ns | Nr |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* All control frames are passed to userspace.
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*/
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static int l2tp_ip_recv(struct sk_buff *skb)
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{
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struct net *net = dev_net(skb->dev);
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struct sock *sk;
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u32 session_id;
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u32 tunnel_id;
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unsigned char *ptr, *optr;
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struct l2tp_session *session;
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struct l2tp_tunnel *tunnel = NULL;
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int length;
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/* Point to L2TP header */
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optr = ptr = skb->data;
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if (!pskb_may_pull(skb, 4))
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goto discard;
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session_id = ntohl(*((__be32 *) ptr));
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ptr += 4;
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/* RFC3931: L2TP/IP packets have the first 4 bytes containing
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* the session_id. If it is 0, the packet is a L2TP control
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* frame and the session_id value can be discarded.
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*/
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if (session_id == 0) {
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__skb_pull(skb, 4);
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goto pass_up;
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}
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/* Ok, this is a data packet. Lookup the session. */
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session = l2tp_session_find(net, NULL, session_id);
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if (session == NULL)
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goto discard;
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tunnel = session->tunnel;
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if (tunnel == NULL)
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goto discard;
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/* Trace packet contents, if enabled */
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if (tunnel->debug & L2TP_MSG_DATA) {
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length = min(32u, skb->len);
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if (!pskb_may_pull(skb, length))
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goto discard;
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pr_debug("%s: ip recv\n", tunnel->name);
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print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length);
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}
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l2tp_recv_common(session, skb, ptr, optr, 0, skb->len, tunnel->recv_payload_hook);
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return 0;
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pass_up:
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/* Get the tunnel_id from the L2TP header */
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if (!pskb_may_pull(skb, 12))
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goto discard;
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if ((skb->data[0] & 0xc0) != 0xc0)
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goto discard;
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tunnel_id = ntohl(*(__be32 *) &skb->data[4]);
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tunnel = l2tp_tunnel_find(net, tunnel_id);
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if (tunnel != NULL)
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sk = tunnel->sock;
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else {
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struct iphdr *iph = (struct iphdr *) skb_network_header(skb);
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read_lock_bh(&l2tp_ip_lock);
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sk = __l2tp_ip_bind_lookup(net, iph->daddr, 0, tunnel_id);
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read_unlock_bh(&l2tp_ip_lock);
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}
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if (sk == NULL)
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goto discard;
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sock_hold(sk);
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if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
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goto discard_put;
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nf_reset(skb);
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return sk_receive_skb(sk, skb, 1);
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discard_put:
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sock_put(sk);
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discard:
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kfree_skb(skb);
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return 0;
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}
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static int l2tp_ip_open(struct sock *sk)
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{
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/* Prevent autobind. We don't have ports. */
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inet_sk(sk)->inet_num = IPPROTO_L2TP;
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write_lock_bh(&l2tp_ip_lock);
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sk_add_node(sk, &l2tp_ip_table);
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write_unlock_bh(&l2tp_ip_lock);
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return 0;
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}
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static void l2tp_ip_close(struct sock *sk, long timeout)
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{
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write_lock_bh(&l2tp_ip_lock);
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hlist_del_init(&sk->sk_bind_node);
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sk_del_node_init(sk);
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write_unlock_bh(&l2tp_ip_lock);
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sk_common_release(sk);
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}
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static void l2tp_ip_destroy_sock(struct sock *sk)
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{
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struct sk_buff *skb;
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struct l2tp_tunnel *tunnel = l2tp_sock_to_tunnel(sk);
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while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL)
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kfree_skb(skb);
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if (tunnel) {
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l2tp_tunnel_closeall(tunnel);
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sock_put(sk);
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}
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sk_refcnt_debug_dec(sk);
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}
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static int l2tp_ip_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
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{
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struct inet_sock *inet = inet_sk(sk);
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struct sockaddr_l2tpip *addr = (struct sockaddr_l2tpip *) uaddr;
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struct net *net = sock_net(sk);
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int ret;
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int chk_addr_ret;
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if (!sock_flag(sk, SOCK_ZAPPED))
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return -EINVAL;
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if (addr_len < sizeof(struct sockaddr_l2tpip))
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return -EINVAL;
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if (addr->l2tp_family != AF_INET)
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return -EINVAL;
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ret = -EADDRINUSE;
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read_lock_bh(&l2tp_ip_lock);
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if (__l2tp_ip_bind_lookup(net, addr->l2tp_addr.s_addr,
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sk->sk_bound_dev_if, addr->l2tp_conn_id))
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goto out_in_use;
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read_unlock_bh(&l2tp_ip_lock);
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lock_sock(sk);
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if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_l2tpip))
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goto out;
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chk_addr_ret = inet_addr_type(net, addr->l2tp_addr.s_addr);
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ret = -EADDRNOTAVAIL;
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if (addr->l2tp_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
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chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
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goto out;
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if (addr->l2tp_addr.s_addr)
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inet->inet_rcv_saddr = inet->inet_saddr = addr->l2tp_addr.s_addr;
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if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
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inet->inet_saddr = 0; /* Use device */
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sk_dst_reset(sk);
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l2tp_ip_sk(sk)->conn_id = addr->l2tp_conn_id;
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write_lock_bh(&l2tp_ip_lock);
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sk_add_bind_node(sk, &l2tp_ip_bind_table);
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sk_del_node_init(sk);
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write_unlock_bh(&l2tp_ip_lock);
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ret = 0;
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sock_reset_flag(sk, SOCK_ZAPPED);
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out:
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release_sock(sk);
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return ret;
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out_in_use:
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read_unlock_bh(&l2tp_ip_lock);
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return ret;
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}
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static int l2tp_ip_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
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{
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struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *) uaddr;
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int rc;
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if (sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
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return -EINVAL;
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if (addr_len < sizeof(*lsa))
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return -EINVAL;
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if (ipv4_is_multicast(lsa->l2tp_addr.s_addr))
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return -EINVAL;
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rc = ip4_datagram_connect(sk, uaddr, addr_len);
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if (rc < 0)
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return rc;
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lock_sock(sk);
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l2tp_ip_sk(sk)->peer_conn_id = lsa->l2tp_conn_id;
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write_lock_bh(&l2tp_ip_lock);
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hlist_del_init(&sk->sk_bind_node);
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sk_add_bind_node(sk, &l2tp_ip_bind_table);
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write_unlock_bh(&l2tp_ip_lock);
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release_sock(sk);
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return rc;
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}
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static int l2tp_ip_disconnect(struct sock *sk, int flags)
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{
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if (sock_flag(sk, SOCK_ZAPPED))
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return 0;
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return udp_disconnect(sk, flags);
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}
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static int l2tp_ip_getname(struct socket *sock, struct sockaddr *uaddr,
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int *uaddr_len, int peer)
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{
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struct sock *sk = sock->sk;
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struct inet_sock *inet = inet_sk(sk);
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struct l2tp_ip_sock *lsk = l2tp_ip_sk(sk);
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struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *)uaddr;
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memset(lsa, 0, sizeof(*lsa));
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lsa->l2tp_family = AF_INET;
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if (peer) {
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if (!inet->inet_dport)
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return -ENOTCONN;
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lsa->l2tp_conn_id = lsk->peer_conn_id;
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lsa->l2tp_addr.s_addr = inet->inet_daddr;
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} else {
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__be32 addr = inet->inet_rcv_saddr;
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if (!addr)
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addr = inet->inet_saddr;
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lsa->l2tp_conn_id = lsk->conn_id;
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lsa->l2tp_addr.s_addr = addr;
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}
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*uaddr_len = sizeof(*lsa);
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return 0;
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}
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static int l2tp_ip_backlog_recv(struct sock *sk, struct sk_buff *skb)
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{
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int rc;
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/* Charge it to the socket, dropping if the queue is full. */
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rc = sock_queue_rcv_skb(sk, skb);
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if (rc < 0)
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goto drop;
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return 0;
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drop:
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IP_INC_STATS(sock_net(sk), IPSTATS_MIB_INDISCARDS);
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kfree_skb(skb);
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return -1;
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}
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/* Userspace will call sendmsg() on the tunnel socket to send L2TP
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* control frames.
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*/
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static int l2tp_ip_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
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{
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struct sk_buff *skb;
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int rc;
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struct inet_sock *inet = inet_sk(sk);
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struct rtable *rt = NULL;
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struct flowi4 *fl4;
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int connected = 0;
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__be32 daddr;
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lock_sock(sk);
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rc = -ENOTCONN;
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if (sock_flag(sk, SOCK_DEAD))
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goto out;
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/* Get and verify the address. */
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if (msg->msg_name) {
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DECLARE_SOCKADDR(struct sockaddr_l2tpip *, lip, msg->msg_name);
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rc = -EINVAL;
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if (msg->msg_namelen < sizeof(*lip))
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goto out;
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if (lip->l2tp_family != AF_INET) {
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rc = -EAFNOSUPPORT;
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if (lip->l2tp_family != AF_UNSPEC)
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goto out;
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}
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daddr = lip->l2tp_addr.s_addr;
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} else {
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rc = -EDESTADDRREQ;
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if (sk->sk_state != TCP_ESTABLISHED)
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goto out;
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daddr = inet->inet_daddr;
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connected = 1;
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}
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/* Allocate a socket buffer */
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rc = -ENOMEM;
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skb = sock_wmalloc(sk, 2 + NET_SKB_PAD + sizeof(struct iphdr) +
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4 + len, 0, GFP_KERNEL);
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if (!skb)
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goto error;
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/* Reserve space for headers, putting IP header on 4-byte boundary. */
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skb_reserve(skb, 2 + NET_SKB_PAD);
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skb_reset_network_header(skb);
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skb_reserve(skb, sizeof(struct iphdr));
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skb_reset_transport_header(skb);
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/* Insert 0 session_id */
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*((__be32 *) skb_put(skb, 4)) = 0;
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/* Copy user data into skb */
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rc = memcpy_from_msg(skb_put(skb, len), msg, len);
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if (rc < 0) {
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kfree_skb(skb);
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goto error;
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}
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fl4 = &inet->cork.fl.u.ip4;
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if (connected)
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rt = (struct rtable *) __sk_dst_check(sk, 0);
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rcu_read_lock();
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if (rt == NULL) {
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const struct ip_options_rcu *inet_opt;
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inet_opt = rcu_dereference(inet->inet_opt);
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/* Use correct destination address if we have options. */
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if (inet_opt && inet_opt->opt.srr)
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daddr = inet_opt->opt.faddr;
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/* If this fails, retransmit mechanism of transport layer will
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* keep trying until route appears or the connection times
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* itself out.
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*/
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rt = ip_route_output_ports(sock_net(sk), fl4, sk,
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daddr, inet->inet_saddr,
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inet->inet_dport, inet->inet_sport,
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sk->sk_protocol, RT_CONN_FLAGS(sk),
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sk->sk_bound_dev_if);
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if (IS_ERR(rt))
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goto no_route;
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if (connected) {
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sk_setup_caps(sk, &rt->dst);
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} else {
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skb_dst_set(skb, &rt->dst);
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goto xmit;
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}
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}
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/* We dont need to clone dst here, it is guaranteed to not disappear.
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* __dev_xmit_skb() might force a refcount if needed.
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*/
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skb_dst_set_noref(skb, &rt->dst);
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xmit:
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/* Queue the packet to IP for output */
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rc = ip_queue_xmit(sk, skb, &inet->cork.fl);
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rcu_read_unlock();
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error:
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if (rc >= 0)
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rc = len;
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out:
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release_sock(sk);
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return rc;
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no_route:
|
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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 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);
|
|
MODULE_ALIAS_NET_PF_PROTO(PF_INET, IPPROTO_L2TP);
|