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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 #include <net/dst.h>
 16 #include <net/sock.h>
 17 
 18 #ifdef CONFIG_XFRM
 19 #include <net/xfrm.h>
 20 #endif
 21 
 22 /* Just some random numbers */
 23 #define L2TP_TUNNEL_MAGIC       0x42114DDA
 24 #define L2TP_SESSION_MAGIC      0x0C04EB7D
 25 
 26 /* Per tunnel, session hash table size */
 27 #define L2TP_HASH_BITS  4
 28 #define L2TP_HASH_SIZE  (1 << L2TP_HASH_BITS)
 29 
 30 /* System-wide, session hash table size */
 31 #define L2TP_HASH_BITS_2        8
 32 #define L2TP_HASH_SIZE_2        (1 << L2TP_HASH_BITS_2)
 33 
 34 struct sk_buff;
 35 
 36 struct l2tp_stats {
 37         atomic_long_t           tx_packets;
 38         atomic_long_t           tx_bytes;
 39         atomic_long_t           tx_errors;
 40         atomic_long_t           rx_packets;
 41         atomic_long_t           rx_bytes;
 42         atomic_long_t           rx_seq_discards;
 43         atomic_long_t           rx_oos_packets;
 44         atomic_long_t           rx_errors;
 45         atomic_long_t           rx_cookie_discards;
 46 };
 47 
 48 struct l2tp_tunnel;
 49 
 50 /* Describes a session. Contains information to determine incoming
 51  * packets and transmit outgoing ones.
 52  */
 53 struct l2tp_session_cfg {
 54         enum l2tp_pwtype        pw_type;
 55         unsigned int            recv_seq:1;     /* expect receive packets with
 56                                                  * sequence numbers? */
 57         unsigned int            send_seq:1;     /* send packets with sequence
 58                                                  * numbers? */
 59         unsigned int            lns_mode:1;     /* behave as LNS? LAC enables
 60                                                  * sequence numbers under
 61                                                  * control of LNS. */
 62         int                     debug;          /* bitmask of debug message
 63                                                  * categories */
 64         u16                     l2specific_type; /* Layer 2 specific type */
 65         u8                      cookie[8];      /* optional cookie */
 66         int                     cookie_len;     /* 0, 4 or 8 bytes */
 67         u8                      peer_cookie[8]; /* peer's cookie */
 68         int                     peer_cookie_len; /* 0, 4 or 8 bytes */
 69         int                     reorder_timeout; /* configured reorder timeout
 70                                                   * (in jiffies) */
 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            recv_seq:1;     /* expect receive packets with
103                                                  * sequence numbers? */
104         unsigned int            send_seq:1;     /* send packets with sequence
105                                                  * numbers? */
106         unsigned int            lns_mode:1;     /* behave as LNS? LAC enables
107                                                  * sequence numbers under
108                                                  * control of LNS. */
109         int                     debug;          /* bitmask of debug message
110                                                  * categories */
111         int                     reorder_timeout; /* configured reorder timeout
112                                                   * (in jiffies) */
113         int                     reorder_skip;   /* set if skip to next nr */
114         enum l2tp_pwtype        pwtype;
115         struct l2tp_stats       stats;
116         struct hlist_node       global_hlist;   /* Global hash list node */
117 
118         int (*build_header)(struct l2tp_session *session, void *buf);
119         void (*recv_skb)(struct l2tp_session *session, struct sk_buff *skb, int data_len);
120         void (*session_close)(struct l2tp_session *session);
121         void (*show)(struct seq_file *m, void *priv);
122         uint8_t                 priv[0];        /* private data */
123 };
124 
125 /* Describes the tunnel. It contains info to track all the associated
126  * sessions so incoming packets can be sorted out
127  */
128 struct l2tp_tunnel_cfg {
129         int                     debug;          /* bitmask of debug message
130                                                  * categories */
131         enum l2tp_encap_type    encap;
132 
133         /* Used only for kernel-created sockets */
134         struct in_addr          local_ip;
135         struct in_addr          peer_ip;
136 #if IS_ENABLED(CONFIG_IPV6)
137         struct in6_addr         *local_ip6;
138         struct in6_addr         *peer_ip6;
139 #endif
140         u16                     local_udp_port;
141         u16                     peer_udp_port;
142         unsigned int            use_udp_checksums:1,
143                                 udp6_zero_tx_checksums:1,
144                                 udp6_zero_rx_checksums:1;
145 };
146 
147 struct l2tp_tunnel {
148         int                     magic;          /* Should be L2TP_TUNNEL_MAGIC */
149 
150         unsigned long           dead;
151 
152         struct rcu_head rcu;
153         rwlock_t                hlist_lock;     /* protect session_hlist */
154         bool                    acpt_newsess;   /* Indicates whether this
155                                                  * tunnel accepts new sessions.
156                                                  * Protected by hlist_lock.
157                                                  */
158         struct hlist_head       session_hlist[L2TP_HASH_SIZE];
159                                                 /* hashed list of sessions,
160                                                  * hashed by id */
161         u32                     tunnel_id;
162         u32                     peer_tunnel_id;
163         int                     version;        /* 2=>L2TPv2, 3=>L2TPv3 */
164 
165         char                    name[20];       /* for logging */
166         int                     debug;          /* bitmask of debug message
167                                                  * categories */
168         enum l2tp_encap_type    encap;
169         struct l2tp_stats       stats;
170 
171         struct list_head        list;           /* Keep a list of all tunnels */
172         struct net              *l2tp_net;      /* the net we belong to */
173 
174         refcount_t              ref_count;
175         void (*old_sk_destruct)(struct sock *);
176         struct sock             *sock;          /* Parent socket */
177         int                     fd;             /* Parent fd, if tunnel socket
178                                                  * was created by userspace */
179 
180         struct work_struct      del_work;
181 };
182 
183 struct l2tp_nl_cmd_ops {
184         int (*session_create)(struct net *net, struct l2tp_tunnel *tunnel,
185                               u32 session_id, u32 peer_session_id,
186                               struct l2tp_session_cfg *cfg);
187         int (*session_delete)(struct l2tp_session *session);
188 };
189 
190 static inline void *l2tp_session_priv(struct l2tp_session *session)
191 {
192         return &session->priv[0];
193 }
194 
195 struct l2tp_tunnel *l2tp_tunnel_get(const struct net *net, u32 tunnel_id);
196 struct l2tp_tunnel *l2tp_tunnel_get_nth(const struct net *net, int nth);
197 struct l2tp_session *l2tp_tunnel_get_session(struct l2tp_tunnel *tunnel,
198                                              u32 session_id);
199 
200 void l2tp_tunnel_free(struct l2tp_tunnel *tunnel);
201 
202 struct l2tp_session *l2tp_session_get(const struct net *net, u32 session_id);
203 struct l2tp_session *l2tp_session_get_nth(struct l2tp_tunnel *tunnel, int nth);
204 struct l2tp_session *l2tp_session_get_by_ifname(const struct net *net,
205                                                 const char *ifname);
206 
207 int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id,
208                        u32 peer_tunnel_id, struct l2tp_tunnel_cfg *cfg,
209                        struct l2tp_tunnel **tunnelp);
210 int l2tp_tunnel_register(struct l2tp_tunnel *tunnel, struct net *net,
211                          struct l2tp_tunnel_cfg *cfg);
212 
213 void l2tp_tunnel_delete(struct l2tp_tunnel *tunnel);
214 struct l2tp_session *l2tp_session_create(int priv_size,
215                                          struct l2tp_tunnel *tunnel,
216                                          u32 session_id, u32 peer_session_id,
217                                          struct l2tp_session_cfg *cfg);
218 int l2tp_session_register(struct l2tp_session *session,
219                           struct l2tp_tunnel *tunnel);
220 
221 void __l2tp_session_unhash(struct l2tp_session *session);
222 int l2tp_session_delete(struct l2tp_session *session);
223 void l2tp_session_free(struct l2tp_session *session);
224 void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb,
225                       unsigned char *ptr, unsigned char *optr, u16 hdrflags,
226                       int length);
227 int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb);
228 void l2tp_session_set_header_len(struct l2tp_session *session, int version);
229 
230 int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb,
231                   int hdr_len);
232 
233 int l2tp_nl_register_ops(enum l2tp_pwtype pw_type,
234                          const struct l2tp_nl_cmd_ops *ops);
235 void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type);
236 int l2tp_ioctl(struct sock *sk, int cmd, unsigned long arg);
237 
238 static inline void l2tp_tunnel_inc_refcount(struct l2tp_tunnel *tunnel)
239 {
240         refcount_inc(&tunnel->ref_count);
241 }
242 
243 static inline void l2tp_tunnel_dec_refcount(struct l2tp_tunnel *tunnel)
244 {
245         if (refcount_dec_and_test(&tunnel->ref_count))
246                 l2tp_tunnel_free(tunnel);
247 }
248 
249 /* Session reference counts. Incremented when code obtains a reference
250  * to a session.
251  */
252 static inline void l2tp_session_inc_refcount(struct l2tp_session *session)
253 {
254         refcount_inc(&session->ref_count);
255 }
256 
257 static inline void l2tp_session_dec_refcount(struct l2tp_session *session)
258 {
259         if (refcount_dec_and_test(&session->ref_count))
260                 l2tp_session_free(session);
261 }
262 
263 static inline int l2tp_get_l2specific_len(struct l2tp_session *session)
264 {
265         switch (session->l2specific_type) {
266         case L2TP_L2SPECTYPE_DEFAULT:
267                 return 4;
268         case L2TP_L2SPECTYPE_NONE:
269         default:
270                 return 0;
271         }
272 }
273 
274 static inline u32 l2tp_tunnel_dst_mtu(const struct l2tp_tunnel *tunnel)
275 {
276         struct dst_entry *dst;
277         u32 mtu;
278 
279         dst = sk_dst_get(tunnel->sock);
280         if (!dst)
281                 return 0;
282 
283         mtu = dst_mtu(dst);
284         dst_release(dst);
285 
286         return mtu;
287 }
288 
289 #ifdef CONFIG_XFRM
290 static inline bool l2tp_tunnel_uses_xfrm(const struct l2tp_tunnel *tunnel)
291 {
292         struct sock *sk = tunnel->sock;
293 
294         return sk && (rcu_access_pointer(sk->sk_policy[0]) ||
295                       rcu_access_pointer(sk->sk_policy[1]));
296 }
297 #else
298 static inline bool l2tp_tunnel_uses_xfrm(const struct l2tp_tunnel *tunnel)
299 {
300         return false;
301 }
302 #endif
303 
304 #define l2tp_printk(ptr, type, func, fmt, ...)                          \
305 do {                                                                    \
306         if (((ptr)->debug) & (type))                                    \
307                 func(fmt, ##__VA_ARGS__);                               \
308 } while (0)
309 
310 #define l2tp_warn(ptr, type, fmt, ...)                                  \
311         l2tp_printk(ptr, type, pr_warn, fmt, ##__VA_ARGS__)
312 #define l2tp_info(ptr, type, fmt, ...)                                  \
313         l2tp_printk(ptr, type, pr_info, fmt, ##__VA_ARGS__)
314 #define l2tp_dbg(ptr, type, fmt, ...)                                   \
315         l2tp_printk(ptr, type, pr_debug, fmt, ##__VA_ARGS__)
316 
317 #define MODULE_ALIAS_L2TP_PWTYPE(type) \
318         MODULE_ALIAS("net-l2tp-type-" __stringify(type))
319 
320 #endif /* _L2TP_CORE_H_ */
321 

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