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682 lines
16 KiB
682 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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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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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <asm/ioctls.h> |
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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/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(const struct net *net, __be32 laddr, |
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__be32 raddr, 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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const struct l2tp_ip_sock *l2tp = l2tp_ip_sk(sk); |
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const struct inet_sock *inet = inet_sk(sk); |
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if (!net_eq(sock_net(sk), net)) |
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continue; |
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if (sk->sk_bound_dev_if && dif && sk->sk_bound_dev_if != dif) |
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continue; |
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if (inet->inet_rcv_saddr && laddr && |
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inet->inet_rcv_saddr != laddr) |
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continue; |
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if (inet->inet_daddr && raddr && inet->inet_daddr != raddr) |
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continue; |
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if (l2tp->conn_id != tunnel_id) |
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continue; |
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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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/* 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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struct iphdr *iph; |
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if (!pskb_may_pull(skb, 4)) |
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goto discard; |
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/* Point to L2TP header */ |
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optr = skb->data; |
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ptr = skb->data; |
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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_get(net, session_id); |
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if (!session) |
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goto discard; |
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tunnel = session->tunnel; |
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if (!tunnel) |
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goto discard_sess; |
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if (l2tp_v3_ensure_opt_in_linear(session, skb, &ptr, &optr)) |
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goto discard_sess; |
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l2tp_recv_common(session, skb, ptr, optr, 0, skb->len); |
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l2tp_session_dec_refcount(session); |
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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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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, iph->saddr, inet_iif(skb), |
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tunnel_id); |
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if (!sk) { |
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read_unlock_bh(&l2tp_ip_lock); |
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goto discard; |
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} |
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sock_hold(sk); |
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read_unlock_bh(&l2tp_ip_lock); |
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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_ct(skb); |
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return sk_receive_skb(sk, skb, 1); |
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discard_sess: |
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l2tp_session_dec_refcount(session); |
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goto discard; |
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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_hash(struct sock *sk) |
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{ |
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if (sk_unhashed(sk)) { |
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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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} |
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return 0; |
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} |
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static void l2tp_ip_unhash(struct sock *sk) |
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{ |
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if (sk_unhashed(sk)) |
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return; |
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write_lock_bh(&l2tp_ip_lock); |
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sk_del_node_init(sk); |
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write_unlock_bh(&l2tp_ip_lock); |
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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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l2tp_ip_hash(sk); |
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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 l2tp_tunnel *tunnel = l2tp_sk_to_tunnel(sk); |
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struct sk_buff *skb; |
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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_delete(tunnel); |
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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 (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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lock_sock(sk); |
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ret = -EINVAL; |
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if (!sock_flag(sk, SOCK_ZAPPED)) |
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goto out; |
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if (sk->sk_state != TCP_CLOSE) |
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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 = addr->l2tp_addr.s_addr; |
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inet->inet_saddr = addr->l2tp_addr.s_addr; |
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} |
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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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write_lock_bh(&l2tp_ip_lock); |
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if (__l2tp_ip_bind_lookup(net, addr->l2tp_addr.s_addr, 0, |
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sk->sk_bound_dev_if, addr->l2tp_conn_id)) { |
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write_unlock_bh(&l2tp_ip_lock); |
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ret = -EADDRINUSE; |
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goto out; |
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} |
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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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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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} |
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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 (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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lock_sock(sk); |
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/* Must bind first - autobinding does not work */ |
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if (sock_flag(sk, SOCK_ZAPPED)) { |
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rc = -EINVAL; |
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goto out_sk; |
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} |
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rc = __ip4_datagram_connect(sk, uaddr, addr_len); |
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if (rc < 0) |
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goto out_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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out_sk: |
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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 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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return sizeof(*lsa); |
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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 0; |
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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) { |
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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 don't 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(); |
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IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); |
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kfree_skb(skb); |
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rc = -EHOSTUNREACH; |
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goto out; |
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} |
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static int l2tp_ip_recvmsg(struct sock *sk, struct msghdr *msg, |
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size_t len, int noblock, int flags, int *addr_len) |
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{ |
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struct inet_sock *inet = inet_sk(sk); |
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size_t copied = 0; |
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int err = -EOPNOTSUPP; |
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DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
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struct sk_buff *skb; |
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if (flags & MSG_OOB) |
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goto out; |
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skb = skb_recv_datagram(sk, flags, noblock, &err); |
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if (!skb) |
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goto out; |
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copied = skb->len; |
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if (len < copied) { |
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msg->msg_flags |= MSG_TRUNC; |
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copied = len; |
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} |
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err = skb_copy_datagram_msg(skb, 0, msg, copied); |
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if (err) |
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goto done; |
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sock_recv_timestamp(msg, sk, skb); |
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/* Copy the address. */ |
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if (sin) { |
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sin->sin_family = AF_INET; |
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sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
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sin->sin_port = 0; |
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memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); |
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*addr_len = sizeof(*sin); |
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} |
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if (inet->cmsg_flags) |
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ip_cmsg_recv(msg, skb); |
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if (flags & MSG_TRUNC) |
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copied = skb->len; |
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done: |
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skb_free_datagram(sk, skb); |
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out: |
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return err ? err : copied; |
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} |
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|
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int l2tp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
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{ |
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struct sk_buff *skb; |
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int amount; |
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|
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switch (cmd) { |
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case SIOCOUTQ: |
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amount = sk_wmem_alloc_get(sk); |
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break; |
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case SIOCINQ: |
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spin_lock_bh(&sk->sk_receive_queue.lock); |
|
skb = skb_peek(&sk->sk_receive_queue); |
|
amount = skb ? skb->len : 0; |
|
spin_unlock_bh(&sk->sk_receive_queue.lock); |
|
break; |
|
|
|
default: |
|
return -ENOIOCTLCMD; |
|
} |
|
|
|
return put_user(amount, (int __user *)arg); |
|
} |
|
EXPORT_SYMBOL_GPL(l2tp_ioctl); |
|
|
|
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 = l2tp_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 = l2tp_ip_hash, |
|
.unhash = l2tp_ip_unhash, |
|
.obj_size = sizeof(struct l2tp_ip_sock), |
|
}; |
|
|
|
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, |
|
.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, |
|
.sendpage = sock_no_sendpage, |
|
}; |
|
|
|
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, |
|
}; |
|
|
|
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 <[email protected]>"); |
|
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);
|
|
|