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TOMOYO Linux Cross Reference
Linux/net/l2tp/l2tp_core.h

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  1 /*
  2  * L2TP internal definitions.
  3  *
  4  * Copyright (c) 2008,2009 Katalix Systems Ltd
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 #include <linux/refcount.h>
 11 
 12 #ifndef _L2TP_CORE_H_
 13 #define _L2TP_CORE_H_
 14 
 15 /* Just some random numbers */
 16 #define L2TP_TUNNEL_MAGIC       0x42114DDA
 17 #define L2TP_SESSION_MAGIC      0x0C04EB7D
 18 
 19 /* Per tunnel, session hash table size */
 20 #define L2TP_HASH_BITS  4
 21 #define L2TP_HASH_SIZE  (1 << L2TP_HASH_BITS)
 22 
 23 /* System-wide, session hash table size */
 24 #define L2TP_HASH_BITS_2        8
 25 #define L2TP_HASH_SIZE_2        (1 << L2TP_HASH_BITS_2)
 26 
 27 struct sk_buff;
 28 
 29 struct l2tp_stats {
 30         atomic_long_t           tx_packets;
 31         atomic_long_t           tx_bytes;
 32         atomic_long_t           tx_errors;
 33         atomic_long_t           rx_packets;
 34         atomic_long_t           rx_bytes;
 35         atomic_long_t           rx_seq_discards;
 36         atomic_long_t           rx_oos_packets;
 37         atomic_long_t           rx_errors;
 38         atomic_long_t           rx_cookie_discards;
 39 };
 40 
 41 struct l2tp_tunnel;
 42 
 43 /* Describes a session. Contains information to determine incoming
 44  * packets and transmit outgoing ones.
 45  */
 46 struct l2tp_session_cfg {
 47         enum l2tp_pwtype        pw_type;
 48         unsigned int            data_seq:2;     /* data sequencing level
 49                                                  * 0 => none, 1 => IP only,
 50                                                  * 2 => all
 51                                                  */
 52         unsigned int            recv_seq:1;     /* expect receive packets with
 53                                                  * sequence numbers? */
 54         unsigned int            send_seq:1;     /* send packets with sequence
 55                                                  * numbers? */
 56         unsigned int            lns_mode:1;     /* behave as LNS? LAC enables
 57                                                  * sequence numbers under
 58                                                  * control of LNS. */
 59         int                     debug;          /* bitmask of debug message
 60                                                  * categories */
 61         u16                     vlan_id;        /* VLAN pseudowire only */
 62         u16                     l2specific_type; /* Layer 2 specific type */
 63         u8                      cookie[8];      /* optional cookie */
 64         int                     cookie_len;     /* 0, 4 or 8 bytes */
 65         u8                      peer_cookie[8]; /* peer's cookie */
 66         int                     peer_cookie_len; /* 0, 4 or 8 bytes */
 67         int                     reorder_timeout; /* configured reorder timeout
 68                                                   * (in jiffies) */
 69         int                     mtu;
 70         int                     mru;
 71         char                    *ifname;
 72 };
 73 
 74 struct l2tp_session {
 75         int                     magic;          /* should be
 76                                                  * L2TP_SESSION_MAGIC */
 77         long                    dead;
 78 
 79         struct l2tp_tunnel      *tunnel;        /* back pointer to tunnel
 80                                                  * context */
 81         u32                     session_id;
 82         u32                     peer_session_id;
 83         u8                      cookie[8];
 84         int                     cookie_len;
 85         u8                      peer_cookie[8];
 86         int                     peer_cookie_len;
 87         u16                     l2specific_type;
 88         u16                     hdr_len;
 89         u32                     nr;             /* session NR state (receive) */
 90         u32                     ns;             /* session NR state (send) */
 91         struct sk_buff_head     reorder_q;      /* receive reorder queue */
 92         u32                     nr_max;         /* max NR. Depends on tunnel */
 93         u32                     nr_window_size; /* NR window size */
 94         u32                     nr_oos;         /* NR of last OOS packet */
 95         int                     nr_oos_count;   /* For OOS recovery */
 96         int                     nr_oos_count_max;
 97         struct hlist_node       hlist;          /* Hash list node */
 98         refcount_t              ref_count;
 99 
100         char                    name[32];       /* for logging */
101         char                    ifname[IFNAMSIZ];
102         unsigned int            data_seq:2;     /* data sequencing level
103                                                  * 0 => none, 1 => IP only,
104                                                  * 2 => all
105                                                  */
106         unsigned int            recv_seq:1;     /* expect receive packets with
107                                                  * sequence numbers? */
108         unsigned int            send_seq:1;     /* send packets with sequence
109                                                  * numbers? */
110         unsigned int            lns_mode:1;     /* behave as LNS? LAC enables
111                                                  * sequence numbers under
112                                                  * control of LNS. */
113         int                     debug;          /* bitmask of debug message
114                                                  * categories */
115         int                     reorder_timeout; /* configured reorder timeout
116                                                   * (in jiffies) */
117         int                     reorder_skip;   /* set if skip to next nr */
118         int                     mtu;
119         int                     mru;
120         enum l2tp_pwtype        pwtype;
121         struct l2tp_stats       stats;
122         struct hlist_node       global_hlist;   /* Global hash list node */
123 
124         int (*build_header)(struct l2tp_session *session, void *buf);
125         void (*recv_skb)(struct l2tp_session *session, struct sk_buff *skb, int data_len);
126         void (*session_close)(struct l2tp_session *session);
127 #if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
128         void (*show)(struct seq_file *m, void *priv);
129 #endif
130         uint8_t                 priv[0];        /* private data */
131 };
132 
133 /* Describes the tunnel. It contains info to track all the associated
134  * sessions so incoming packets can be sorted out
135  */
136 struct l2tp_tunnel_cfg {
137         int                     debug;          /* bitmask of debug message
138                                                  * categories */
139         enum l2tp_encap_type    encap;
140 
141         /* Used only for kernel-created sockets */
142         struct in_addr          local_ip;
143         struct in_addr          peer_ip;
144 #if IS_ENABLED(CONFIG_IPV6)
145         struct in6_addr         *local_ip6;
146         struct in6_addr         *peer_ip6;
147 #endif
148         u16                     local_udp_port;
149         u16                     peer_udp_port;
150         unsigned int            use_udp_checksums:1,
151                                 udp6_zero_tx_checksums:1,
152                                 udp6_zero_rx_checksums:1;
153 };
154 
155 struct l2tp_tunnel {
156         int                     magic;          /* Should be L2TP_TUNNEL_MAGIC */
157 
158         unsigned long           dead;
159 
160         struct rcu_head rcu;
161         rwlock_t                hlist_lock;     /* protect session_hlist */
162         bool                    acpt_newsess;   /* Indicates whether this
163                                                  * tunnel accepts new sessions.
164                                                  * Protected by hlist_lock.
165                                                  */
166         struct hlist_head       session_hlist[L2TP_HASH_SIZE];
167                                                 /* hashed list of sessions,
168                                                  * hashed by id */
169         u32                     tunnel_id;
170         u32                     peer_tunnel_id;
171         int                     version;        /* 2=>L2TPv2, 3=>L2TPv3 */
172 
173         char                    name[20];       /* for logging */
174         int                     debug;          /* bitmask of debug message
175                                                  * categories */
176         enum l2tp_encap_type    encap;
177         struct l2tp_stats       stats;
178 
179         struct list_head        list;           /* Keep a list of all tunnels */
180         struct net              *l2tp_net;      /* the net we belong to */
181 
182         refcount_t              ref_count;
183 #ifdef CONFIG_DEBUG_FS
184         void (*show)(struct seq_file *m, void *arg);
185 #endif
186         int (*recv_payload_hook)(struct sk_buff *skb);
187         void (*old_sk_destruct)(struct sock *);
188         struct sock             *sock;          /* Parent socket */
189         int                     fd;             /* Parent fd, if tunnel socket
190                                                  * was created by userspace */
191 
192         struct work_struct      del_work;
193 
194         uint8_t                 priv[0];        /* private data */
195 };
196 
197 struct l2tp_nl_cmd_ops {
198         int (*session_create)(struct net *net, struct l2tp_tunnel *tunnel,
199                               u32 session_id, u32 peer_session_id,
200                               struct l2tp_session_cfg *cfg);
201         int (*session_delete)(struct l2tp_session *session);
202 };
203 
204 static inline void *l2tp_tunnel_priv(struct l2tp_tunnel *tunnel)
205 {
206         return &tunnel->priv[0];
207 }
208 
209 static inline void *l2tp_session_priv(struct l2tp_session *session)
210 {
211         return &session->priv[0];
212 }
213 
214 struct l2tp_tunnel *l2tp_tunnel_get(const struct net *net, u32 tunnel_id);
215 struct l2tp_tunnel *l2tp_tunnel_get_nth(const struct net *net, int nth);
216 
217 void l2tp_tunnel_free(struct l2tp_tunnel *tunnel);
218 
219 struct l2tp_session *l2tp_session_get(const struct net *net,
220                                       struct l2tp_tunnel *tunnel,
221                                       u32 session_id);
222 struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth);
223 struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net,
224                                                 const char *ifname);
225 
226 int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id,
227                        u32 peer_tunnel_id, struct l2tp_tunnel_cfg *cfg,
228                        struct l2tp_tunnel **tunnelp);
229 int l2tp_tunnel_register(struct l2tp_tunnel *tunnel, struct net *net,
230                          struct l2tp_tunnel_cfg *cfg);
231 
232 void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel);
233 void l2tp_tunnel_delete(struct l2tp_tunnel *tunnel);
234 struct l2tp_session *l2tp_session_create(int priv_size,
235                                          struct l2tp_tunnel *tunnel,
236                                          u32 session_id, u32 peer_session_id,
237                                          struct l2tp_session_cfg *cfg);
238 int l2tp_session_register(struct l2tp_session *session,
239                           struct l2tp_tunnel *tunnel);
240 
241 void __l2tp_session_unhash(struct l2tp_session *session);
242 int l2tp_session_delete(struct l2tp_session *session);
243 void l2tp_session_free(struct l2tp_session *session);
244 void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb,
245                       unsigned char *ptr, unsigned char *optr, u16 hdrflags,
246                       int length, int (*payload_hook)(struct sk_buff *skb));
247 int l2tp_session_queue_purge(struct l2tp_session *session);
248 int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb);
249 void l2tp_session_set_header_len(struct l2tp_session *session, int version);
250 
251 int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb,
252                   int hdr_len);
253 
254 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type,
255                          const struct l2tp_nl_cmd_ops *ops);
256 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type);
257 int l2tp_ioctl(struct sock *sk, int cmd, unsigned long arg);
258 
259 static inline void l2tp_tunnel_inc_refcount(struct l2tp_tunnel *tunnel)
260 {
261         refcount_inc(&tunnel->ref_count);
262 }
263 
264 static inline void l2tp_tunnel_dec_refcount(struct l2tp_tunnel *tunnel)
265 {
266         if (refcount_dec_and_test(&tunnel->ref_count))
267                 l2tp_tunnel_free(tunnel);
268 }
269 
270 /* Session reference counts. Incremented when code obtains a reference
271  * to a session.
272  */
273 static inline void l2tp_session_inc_refcount(struct l2tp_session *session)
274 {
275         refcount_inc(&session->ref_count);
276 }
277 
278 static inline void l2tp_session_dec_refcount(struct l2tp_session *session)
279 {
280         if (refcount_dec_and_test(&session->ref_count))
281                 l2tp_session_free(session);
282 }
283 
284 static inline int l2tp_get_l2specific_len(struct l2tp_session *session)
285 {
286         switch (session->l2specific_type) {
287         case L2TP_L2SPECTYPE_DEFAULT:
288                 return 4;
289         case L2TP_L2SPECTYPE_NONE:
290         default:
291                 return 0;
292         }
293 }
294 
295 #define l2tp_printk(ptr, type, func, fmt, ...)                          \
296 do {                                                                    \
297         if (((ptr)->debug) & (type))                                    \
298                 func(fmt, ##__VA_ARGS__);                               \
299 } while (0)
300 
301 #define l2tp_warn(ptr, type, fmt, ...)                                  \
302         l2tp_printk(ptr, type, pr_warn, fmt, ##__VA_ARGS__)
303 #define l2tp_info(ptr, type, fmt, ...)                                  \
304         l2tp_printk(ptr, type, pr_info, fmt, ##__VA_ARGS__)
305 #define l2tp_dbg(ptr, type, fmt, ...)                                   \
306         l2tp_printk(ptr, type, pr_debug, fmt, ##__VA_ARGS__)
307 
308 #define MODULE_ALIAS_L2TP_PWTYPE(type) \
309         MODULE_ALIAS("net-l2tp-type-" __stringify(type))
310 
311 #endif /* _L2TP_CORE_H_ */
312 

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