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f1f39f9110
It should not be necessary to do explicit module loading when configuring L2TP. Modules should be loaded as needed instead (as is done already with netlink and other tunnel types). This patch adds a new module alias type and code to load the sub module on demand. Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David S. Miller <davem@davemloft.net>
328 lines
9.9 KiB
C
328 lines
9.9 KiB
C
/*
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* L2TP internal definitions.
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*
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* Copyright (c) 2008,2009 Katalix Systems Ltd
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _L2TP_CORE_H_
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#define _L2TP_CORE_H_
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/* Just some random numbers */
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#define L2TP_TUNNEL_MAGIC 0x42114DDA
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#define L2TP_SESSION_MAGIC 0x0C04EB7D
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/* Per tunnel, session hash table size */
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#define L2TP_HASH_BITS 4
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#define L2TP_HASH_SIZE (1 << L2TP_HASH_BITS)
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/* System-wide, session hash table size */
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#define L2TP_HASH_BITS_2 8
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#define L2TP_HASH_SIZE_2 (1 << L2TP_HASH_BITS_2)
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/* Debug message categories for the DEBUG socket option */
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enum {
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L2TP_MSG_DEBUG = (1 << 0), /* verbose debug (if
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* compiled in) */
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L2TP_MSG_CONTROL = (1 << 1), /* userspace - kernel
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* interface */
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L2TP_MSG_SEQ = (1 << 2), /* sequence numbers */
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L2TP_MSG_DATA = (1 << 3), /* data packets */
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};
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struct sk_buff;
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struct l2tp_stats {
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atomic_long_t tx_packets;
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atomic_long_t tx_bytes;
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atomic_long_t tx_errors;
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atomic_long_t rx_packets;
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atomic_long_t rx_bytes;
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atomic_long_t rx_seq_discards;
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atomic_long_t rx_oos_packets;
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atomic_long_t rx_errors;
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atomic_long_t rx_cookie_discards;
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};
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struct l2tp_tunnel;
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/* Describes a session. Contains information to determine incoming
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* packets and transmit outgoing ones.
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*/
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struct l2tp_session_cfg {
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enum l2tp_pwtype pw_type;
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unsigned int data_seq:2; /* data sequencing level
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* 0 => none, 1 => IP only,
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* 2 => all
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*/
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unsigned int recv_seq:1; /* expect receive packets with
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* sequence numbers? */
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unsigned int send_seq:1; /* send packets with sequence
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* numbers? */
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unsigned int lns_mode:1; /* behave as LNS? LAC enables
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* sequence numbers under
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* control of LNS. */
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int debug; /* bitmask of debug message
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* categories */
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u16 vlan_id; /* VLAN pseudowire only */
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u16 offset; /* offset to payload */
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u16 l2specific_len; /* Layer 2 specific length */
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u16 l2specific_type; /* Layer 2 specific type */
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u8 cookie[8]; /* optional cookie */
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int cookie_len; /* 0, 4 or 8 bytes */
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u8 peer_cookie[8]; /* peer's cookie */
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int peer_cookie_len; /* 0, 4 or 8 bytes */
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int reorder_timeout; /* configured reorder timeout
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* (in jiffies) */
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int mtu;
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int mru;
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char *ifname;
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};
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struct l2tp_session {
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int magic; /* should be
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* L2TP_SESSION_MAGIC */
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struct l2tp_tunnel *tunnel; /* back pointer to tunnel
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* context */
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u32 session_id;
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u32 peer_session_id;
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u8 cookie[8];
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int cookie_len;
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u8 peer_cookie[8];
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int peer_cookie_len;
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u16 offset; /* offset from end of L2TP header
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to beginning of data */
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u16 l2specific_len;
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u16 l2specific_type;
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u16 hdr_len;
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u32 nr; /* session NR state (receive) */
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u32 ns; /* session NR state (send) */
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struct sk_buff_head reorder_q; /* receive reorder queue */
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u32 nr_max; /* max NR. Depends on tunnel */
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u32 nr_window_size; /* NR window size */
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u32 nr_oos; /* NR of last OOS packet */
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int nr_oos_count; /* For OOS recovery */
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int nr_oos_count_max;
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struct hlist_node hlist; /* Hash list node */
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atomic_t ref_count;
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char name[32]; /* for logging */
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char ifname[IFNAMSIZ];
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unsigned int data_seq:2; /* data sequencing level
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* 0 => none, 1 => IP only,
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* 2 => all
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*/
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unsigned int recv_seq:1; /* expect receive packets with
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* sequence numbers? */
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unsigned int send_seq:1; /* send packets with sequence
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* numbers? */
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unsigned int lns_mode:1; /* behave as LNS? LAC enables
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* sequence numbers under
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* control of LNS. */
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int debug; /* bitmask of debug message
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* categories */
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int reorder_timeout; /* configured reorder timeout
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* (in jiffies) */
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int reorder_skip; /* set if skip to next nr */
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int mtu;
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int mru;
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enum l2tp_pwtype pwtype;
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struct l2tp_stats stats;
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struct hlist_node global_hlist; /* Global hash list node */
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int (*build_header)(struct l2tp_session *session, void *buf);
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void (*recv_skb)(struct l2tp_session *session, struct sk_buff *skb, int data_len);
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void (*session_close)(struct l2tp_session *session);
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void (*ref)(struct l2tp_session *session);
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void (*deref)(struct l2tp_session *session);
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#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
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void (*show)(struct seq_file *m, void *priv);
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#endif
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uint8_t priv[0]; /* private data */
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};
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/* Describes the tunnel. It contains info to track all the associated
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* sessions so incoming packets can be sorted out
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*/
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struct l2tp_tunnel_cfg {
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int debug; /* bitmask of debug message
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* categories */
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enum l2tp_encap_type encap;
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/* Used only for kernel-created sockets */
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struct in_addr local_ip;
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struct in_addr peer_ip;
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#if IS_ENABLED(CONFIG_IPV6)
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struct in6_addr *local_ip6;
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struct in6_addr *peer_ip6;
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#endif
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u16 local_udp_port;
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u16 peer_udp_port;
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unsigned int use_udp_checksums:1,
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udp6_zero_tx_checksums:1,
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udp6_zero_rx_checksums:1;
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};
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struct l2tp_tunnel {
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int magic; /* Should be L2TP_TUNNEL_MAGIC */
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struct rcu_head rcu;
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rwlock_t hlist_lock; /* protect session_hlist */
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struct hlist_head session_hlist[L2TP_HASH_SIZE];
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/* hashed list of sessions,
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* hashed by id */
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u32 tunnel_id;
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u32 peer_tunnel_id;
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int version; /* 2=>L2TPv2, 3=>L2TPv3 */
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char name[20]; /* for logging */
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int debug; /* bitmask of debug message
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* categories */
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enum l2tp_encap_type encap;
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struct l2tp_stats stats;
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struct list_head list; /* Keep a list of all tunnels */
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struct net *l2tp_net; /* the net we belong to */
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atomic_t ref_count;
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#ifdef CONFIG_DEBUG_FS
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void (*show)(struct seq_file *m, void *arg);
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#endif
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int (*recv_payload_hook)(struct sk_buff *skb);
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void (*old_sk_destruct)(struct sock *);
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struct sock *sock; /* Parent socket */
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int fd; /* Parent fd, if tunnel socket
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* was created by userspace */
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#if IS_ENABLED(CONFIG_IPV6)
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bool v4mapped;
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#endif
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struct work_struct del_work;
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uint8_t priv[0]; /* private data */
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};
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struct l2tp_nl_cmd_ops {
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int (*session_create)(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg);
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int (*session_delete)(struct l2tp_session *session);
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};
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static inline void *l2tp_tunnel_priv(struct l2tp_tunnel *tunnel)
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{
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return &tunnel->priv[0];
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}
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static inline void *l2tp_session_priv(struct l2tp_session *session)
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{
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return &session->priv[0];
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}
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static inline struct l2tp_tunnel *l2tp_sock_to_tunnel(struct sock *sk)
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{
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struct l2tp_tunnel *tunnel;
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if (sk == NULL)
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return NULL;
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sock_hold(sk);
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tunnel = (struct l2tp_tunnel *)(sk->sk_user_data);
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if (tunnel == NULL) {
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sock_put(sk);
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goto out;
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}
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BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC);
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out:
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return tunnel;
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}
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struct l2tp_session *l2tp_session_find(struct net *net,
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struct l2tp_tunnel *tunnel,
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u32 session_id);
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struct l2tp_session *l2tp_session_find_nth(struct l2tp_tunnel *tunnel, int nth);
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struct l2tp_session *l2tp_session_find_by_ifname(struct net *net, char *ifname);
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struct l2tp_tunnel *l2tp_tunnel_find(struct net *net, u32 tunnel_id);
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struct l2tp_tunnel *l2tp_tunnel_find_nth(struct net *net, int nth);
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int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id,
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u32 peer_tunnel_id, struct l2tp_tunnel_cfg *cfg,
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struct l2tp_tunnel **tunnelp);
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void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel);
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int l2tp_tunnel_delete(struct l2tp_tunnel *tunnel);
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struct l2tp_session *l2tp_session_create(int priv_size,
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struct l2tp_tunnel *tunnel,
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u32 session_id, u32 peer_session_id,
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struct l2tp_session_cfg *cfg);
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void __l2tp_session_unhash(struct l2tp_session *session);
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int l2tp_session_delete(struct l2tp_session *session);
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void l2tp_session_free(struct l2tp_session *session);
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void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb,
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unsigned char *ptr, unsigned char *optr, u16 hdrflags,
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int length, int (*payload_hook)(struct sk_buff *skb));
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int l2tp_session_queue_purge(struct l2tp_session *session);
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int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb);
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void l2tp_session_set_header_len(struct l2tp_session *session, int version);
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int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb,
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int hdr_len);
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int l2tp_nl_register_ops(enum l2tp_pwtype pw_type,
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const struct l2tp_nl_cmd_ops *ops);
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void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type);
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/* Session reference counts. Incremented when code obtains a reference
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* to a session.
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*/
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static inline void l2tp_session_inc_refcount_1(struct l2tp_session *session)
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{
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atomic_inc(&session->ref_count);
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}
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static inline void l2tp_session_dec_refcount_1(struct l2tp_session *session)
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{
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if (atomic_dec_and_test(&session->ref_count))
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l2tp_session_free(session);
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}
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#ifdef L2TP_REFCNT_DEBUG
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#define l2tp_session_inc_refcount(_s) \
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do { \
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pr_debug("l2tp_session_inc_refcount: %s:%d %s: cnt=%d\n", \
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__func__, __LINE__, (_s)->name, \
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atomic_read(&_s->ref_count)); \
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l2tp_session_inc_refcount_1(_s); \
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} while (0)
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#define l2tp_session_dec_refcount(_s) \
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do { \
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pr_debug("l2tp_session_dec_refcount: %s:%d %s: cnt=%d\n", \
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__func__, __LINE__, (_s)->name, \
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atomic_read(&_s->ref_count)); \
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l2tp_session_dec_refcount_1(_s); \
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} while (0)
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#else
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#define l2tp_session_inc_refcount(s) l2tp_session_inc_refcount_1(s)
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#define l2tp_session_dec_refcount(s) l2tp_session_dec_refcount_1(s)
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#endif
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#define l2tp_printk(ptr, type, func, fmt, ...) \
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do { \
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if (((ptr)->debug) & (type)) \
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func(fmt, ##__VA_ARGS__); \
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} while (0)
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#define l2tp_warn(ptr, type, fmt, ...) \
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l2tp_printk(ptr, type, pr_warn, fmt, ##__VA_ARGS__)
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#define l2tp_info(ptr, type, fmt, ...) \
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l2tp_printk(ptr, type, pr_info, fmt, ##__VA_ARGS__)
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#define l2tp_dbg(ptr, type, fmt, ...) \
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l2tp_printk(ptr, type, pr_debug, fmt, ##__VA_ARGS__)
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#define MODULE_ALIAS_L2TP_PWTYPE(type) \
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MODULE_ALIAS("net-l2tp-type-" __stringify(type))
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#endif /* _L2TP_CORE_H_ */
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