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![Arnd Bergmann](/assets/img/avatar_default.png)
Removing one of the callers of pppol2tp_session_get_sock caused a harmless
warning in some configurations:
net/l2tp/l2tp_ppp.c:142:21: 'pppol2tp_session_get_sock' defined but not used [-Wunused-function]
Rather than adding another #ifdef here, using a proper IS_ENABLED()
check makes the code more readable and avoids those warnings while
letting the compiler figure out for itself which code is needed.
This adds one pointer for the unused show() callback in struct
l2tp_session, but that seems harmless.
Fixes: b0e29063dc
("l2tp: remove pppol2tp_session_ioctl()")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
320 lines
9.2 KiB
C
320 lines
9.2 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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#include <linux/refcount.h>
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#ifndef _L2TP_CORE_H_
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#define _L2TP_CORE_H_
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#include <net/dst.h>
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#include <net/sock.h>
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#ifdef CONFIG_XFRM
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#include <net/xfrm.h>
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#endif
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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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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 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 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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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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long dead;
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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 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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refcount_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 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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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 (*show)(struct seq_file *m, void *priv);
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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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unsigned long dead;
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struct rcu_head rcu;
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rwlock_t hlist_lock; /* protect session_hlist */
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bool acpt_newsess; /* Indicates whether this
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* tunnel accepts new sessions.
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* Protected by hlist_lock.
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*/
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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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refcount_t ref_count;
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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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struct work_struct del_work;
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};
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struct l2tp_nl_cmd_ops {
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int (*session_create)(struct net *net, 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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int (*session_delete)(struct l2tp_session *session);
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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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struct l2tp_tunnel *l2tp_tunnel_get(const struct net *net, u32 tunnel_id);
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struct l2tp_tunnel *l2tp_tunnel_get_nth(const struct net *net, int nth);
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struct l2tp_session *l2tp_tunnel_get_session(struct l2tp_tunnel *tunnel,
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u32 session_id);
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void l2tp_tunnel_free(struct l2tp_tunnel *tunnel);
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struct l2tp_session *l2tp_session_get(const struct net *net, u32 session_id);
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struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth);
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struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net,
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const char *ifname);
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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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int l2tp_tunnel_register(struct l2tp_tunnel *tunnel, struct net *net,
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struct l2tp_tunnel_cfg *cfg);
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void 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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int l2tp_session_register(struct l2tp_session *session,
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struct l2tp_tunnel *tunnel);
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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);
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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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int l2tp_ioctl(struct sock *sk, int cmd, unsigned long arg);
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static inline void l2tp_tunnel_inc_refcount(struct l2tp_tunnel *tunnel)
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{
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refcount_inc(&tunnel->ref_count);
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}
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static inline void l2tp_tunnel_dec_refcount(struct l2tp_tunnel *tunnel)
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{
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if (refcount_dec_and_test(&tunnel->ref_count))
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l2tp_tunnel_free(tunnel);
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}
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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(struct l2tp_session *session)
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{
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refcount_inc(&session->ref_count);
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}
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static inline void l2tp_session_dec_refcount(struct l2tp_session *session)
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{
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if (refcount_dec_and_test(&session->ref_count))
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l2tp_session_free(session);
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}
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static inline int l2tp_get_l2specific_len(struct l2tp_session *session)
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{
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switch (session->l2specific_type) {
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case L2TP_L2SPECTYPE_DEFAULT:
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return 4;
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case L2TP_L2SPECTYPE_NONE:
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default:
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return 0;
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}
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}
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static inline u32 l2tp_tunnel_dst_mtu(const struct l2tp_tunnel *tunnel)
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{
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struct dst_entry *dst;
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u32 mtu;
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dst = sk_dst_get(tunnel->sock);
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if (!dst)
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return 0;
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mtu = dst_mtu(dst);
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dst_release(dst);
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return mtu;
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}
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#ifdef CONFIG_XFRM
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static inline bool l2tp_tunnel_uses_xfrm(const struct l2tp_tunnel *tunnel)
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{
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struct sock *sk = tunnel->sock;
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return sk && (rcu_access_pointer(sk->sk_policy[0]) ||
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rcu_access_pointer(sk->sk_policy[1]));
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}
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#else
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static inline bool l2tp_tunnel_uses_xfrm(const struct l2tp_tunnel *tunnel)
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{
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return false;
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}
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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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