Root/
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 | |
11 | #ifndef _L2TP_CORE_H_ |
12 | #define _L2TP_CORE_H_ |
13 | |
14 | /* Just some random numbers */ |
15 | #define L2TP_TUNNEL_MAGIC 0x42114DDA |
16 | #define L2TP_SESSION_MAGIC 0x0C04EB7D |
17 | |
18 | /* Per tunnel, session hash table size */ |
19 | #define L2TP_HASH_BITS 4 |
20 | #define L2TP_HASH_SIZE (1 << L2TP_HASH_BITS) |
21 | |
22 | /* System-wide, session hash table size */ |
23 | #define L2TP_HASH_BITS_2 8 |
24 | #define L2TP_HASH_SIZE_2 (1 << L2TP_HASH_BITS_2) |
25 | |
26 | /* Debug message categories for the DEBUG socket option */ |
27 | enum { |
28 | L2TP_MSG_DEBUG = (1 << 0), /* verbose debug (if |
29 | * compiled in) */ |
30 | L2TP_MSG_CONTROL = (1 << 1), /* userspace - kernel |
31 | * interface */ |
32 | L2TP_MSG_SEQ = (1 << 2), /* sequence numbers */ |
33 | L2TP_MSG_DATA = (1 << 3), /* data packets */ |
34 | }; |
35 | |
36 | struct sk_buff; |
37 | |
38 | struct l2tp_stats { |
39 | atomic_long_t tx_packets; |
40 | atomic_long_t tx_bytes; |
41 | atomic_long_t tx_errors; |
42 | atomic_long_t rx_packets; |
43 | atomic_long_t rx_bytes; |
44 | atomic_long_t rx_seq_discards; |
45 | atomic_long_t rx_oos_packets; |
46 | atomic_long_t rx_errors; |
47 | atomic_long_t rx_cookie_discards; |
48 | }; |
49 | |
50 | struct l2tp_tunnel; |
51 | |
52 | /* Describes a session. Contains information to determine incoming |
53 | * packets and transmit outgoing ones. |
54 | */ |
55 | struct l2tp_session_cfg { |
56 | enum l2tp_pwtype pw_type; |
57 | unsigned int data_seq:2; /* data sequencing level |
58 | * 0 => none, 1 => IP only, |
59 | * 2 => all |
60 | */ |
61 | unsigned int recv_seq:1; /* expect receive packets with |
62 | * sequence numbers? */ |
63 | unsigned int send_seq:1; /* send packets with sequence |
64 | * numbers? */ |
65 | unsigned int lns_mode:1; /* behave as LNS? LAC enables |
66 | * sequence numbers under |
67 | * control of LNS. */ |
68 | int debug; /* bitmask of debug message |
69 | * categories */ |
70 | u16 vlan_id; /* VLAN pseudowire only */ |
71 | u16 offset; /* offset to payload */ |
72 | u16 l2specific_len; /* Layer 2 specific length */ |
73 | u16 l2specific_type; /* Layer 2 specific type */ |
74 | u8 cookie[8]; /* optional cookie */ |
75 | int cookie_len; /* 0, 4 or 8 bytes */ |
76 | u8 peer_cookie[8]; /* peer's cookie */ |
77 | int peer_cookie_len; /* 0, 4 or 8 bytes */ |
78 | int reorder_timeout; /* configured reorder timeout |
79 | * (in jiffies) */ |
80 | int mtu; |
81 | int mru; |
82 | char *ifname; |
83 | }; |
84 | |
85 | struct l2tp_session { |
86 | int magic; /* should be |
87 | * L2TP_SESSION_MAGIC */ |
88 | |
89 | struct l2tp_tunnel *tunnel; /* back pointer to tunnel |
90 | * context */ |
91 | u32 session_id; |
92 | u32 peer_session_id; |
93 | u8 cookie[8]; |
94 | int cookie_len; |
95 | u8 peer_cookie[8]; |
96 | int peer_cookie_len; |
97 | u16 offset; /* offset from end of L2TP header |
98 | to beginning of data */ |
99 | u16 l2specific_len; |
100 | u16 l2specific_type; |
101 | u16 hdr_len; |
102 | u32 nr; /* session NR state (receive) */ |
103 | u32 ns; /* session NR state (send) */ |
104 | struct sk_buff_head reorder_q; /* receive reorder queue */ |
105 | struct hlist_node hlist; /* Hash list node */ |
106 | atomic_t ref_count; |
107 | |
108 | char name[32]; /* for logging */ |
109 | char ifname[IFNAMSIZ]; |
110 | unsigned int data_seq:2; /* data sequencing level |
111 | * 0 => none, 1 => IP only, |
112 | * 2 => all |
113 | */ |
114 | unsigned int recv_seq:1; /* expect receive packets with |
115 | * sequence numbers? */ |
116 | unsigned int send_seq:1; /* send packets with sequence |
117 | * numbers? */ |
118 | unsigned int lns_mode:1; /* behave as LNS? LAC enables |
119 | * sequence numbers under |
120 | * control of LNS. */ |
121 | int debug; /* bitmask of debug message |
122 | * categories */ |
123 | int reorder_timeout; /* configured reorder timeout |
124 | * (in jiffies) */ |
125 | int reorder_skip; /* set if skip to next nr */ |
126 | int mtu; |
127 | int mru; |
128 | enum l2tp_pwtype pwtype; |
129 | struct l2tp_stats stats; |
130 | struct hlist_node global_hlist; /* Global hash list node */ |
131 | |
132 | int (*build_header)(struct l2tp_session *session, void *buf); |
133 | void (*recv_skb)(struct l2tp_session *session, struct sk_buff *skb, int data_len); |
134 | void (*session_close)(struct l2tp_session *session); |
135 | void (*ref)(struct l2tp_session *session); |
136 | void (*deref)(struct l2tp_session *session); |
137 | #if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE) |
138 | void (*show)(struct seq_file *m, void *priv); |
139 | #endif |
140 | uint8_t priv[0]; /* private data */ |
141 | }; |
142 | |
143 | /* Describes the tunnel. It contains info to track all the associated |
144 | * sessions so incoming packets can be sorted out |
145 | */ |
146 | struct l2tp_tunnel_cfg { |
147 | int debug; /* bitmask of debug message |
148 | * categories */ |
149 | enum l2tp_encap_type encap; |
150 | |
151 | /* Used only for kernel-created sockets */ |
152 | struct in_addr local_ip; |
153 | struct in_addr peer_ip; |
154 | #if IS_ENABLED(CONFIG_IPV6) |
155 | struct in6_addr *local_ip6; |
156 | struct in6_addr *peer_ip6; |
157 | #endif |
158 | u16 local_udp_port; |
159 | u16 peer_udp_port; |
160 | unsigned int use_udp_checksums:1; |
161 | }; |
162 | |
163 | struct l2tp_tunnel { |
164 | int magic; /* Should be L2TP_TUNNEL_MAGIC */ |
165 | struct rcu_head rcu; |
166 | rwlock_t hlist_lock; /* protect session_hlist */ |
167 | struct hlist_head session_hlist[L2TP_HASH_SIZE]; |
168 | /* hashed list of sessions, |
169 | * hashed by id */ |
170 | u32 tunnel_id; |
171 | u32 peer_tunnel_id; |
172 | int version; /* 2=>L2TPv2, 3=>L2TPv3 */ |
173 | |
174 | char name[20]; /* for logging */ |
175 | int debug; /* bitmask of debug message |
176 | * categories */ |
177 | enum l2tp_encap_type encap; |
178 | struct l2tp_stats stats; |
179 | |
180 | struct list_head list; /* Keep a list of all tunnels */ |
181 | struct net *l2tp_net; /* the net we belong to */ |
182 | |
183 | atomic_t ref_count; |
184 | #ifdef CONFIG_DEBUG_FS |
185 | void (*show)(struct seq_file *m, void *arg); |
186 | #endif |
187 | int (*recv_payload_hook)(struct sk_buff *skb); |
188 | void (*old_sk_destruct)(struct sock *); |
189 | struct sock *sock; /* Parent socket */ |
190 | int fd; /* Parent fd, if tunnel socket |
191 | * was created by userspace */ |
192 | |
193 | struct work_struct del_work; |
194 | |
195 | uint8_t priv[0]; /* private data */ |
196 | }; |
197 | |
198 | struct l2tp_nl_cmd_ops { |
199 | int (*session_create)(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg); |
200 | int (*session_delete)(struct l2tp_session *session); |
201 | }; |
202 | |
203 | static inline void *l2tp_tunnel_priv(struct l2tp_tunnel *tunnel) |
204 | { |
205 | return &tunnel->priv[0]; |
206 | } |
207 | |
208 | static inline void *l2tp_session_priv(struct l2tp_session *session) |
209 | { |
210 | return &session->priv[0]; |
211 | } |
212 | |
213 | static inline struct l2tp_tunnel *l2tp_sock_to_tunnel(struct sock *sk) |
214 | { |
215 | struct l2tp_tunnel *tunnel; |
216 | |
217 | if (sk == NULL) |
218 | return NULL; |
219 | |
220 | sock_hold(sk); |
221 | tunnel = (struct l2tp_tunnel *)(sk->sk_user_data); |
222 | if (tunnel == NULL) { |
223 | sock_put(sk); |
224 | goto out; |
225 | } |
226 | |
227 | BUG_ON(tunnel->magic != L2TP_TUNNEL_MAGIC); |
228 | |
229 | out: |
230 | return tunnel; |
231 | } |
232 | |
233 | extern struct sock *l2tp_tunnel_sock_lookup(struct l2tp_tunnel *tunnel); |
234 | extern void l2tp_tunnel_sock_put(struct sock *sk); |
235 | extern struct l2tp_session *l2tp_session_find(struct net *net, struct l2tp_tunnel *tunnel, u32 session_id); |
236 | extern struct l2tp_session *l2tp_session_find_nth(struct l2tp_tunnel *tunnel, int nth); |
237 | extern struct l2tp_session *l2tp_session_find_by_ifname(struct net *net, char *ifname); |
238 | extern struct l2tp_tunnel *l2tp_tunnel_find(struct net *net, u32 tunnel_id); |
239 | extern struct l2tp_tunnel *l2tp_tunnel_find_nth(struct net *net, int nth); |
240 | |
241 | extern int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32 peer_tunnel_id, struct l2tp_tunnel_cfg *cfg, struct l2tp_tunnel **tunnelp); |
242 | extern void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel); |
243 | extern int l2tp_tunnel_delete(struct l2tp_tunnel *tunnel); |
244 | extern struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunnel, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg); |
245 | extern void __l2tp_session_unhash(struct l2tp_session *session); |
246 | extern int l2tp_session_delete(struct l2tp_session *session); |
247 | extern void l2tp_session_free(struct l2tp_session *session); |
248 | extern void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb, unsigned char *ptr, unsigned char *optr, u16 hdrflags, int length, int (*payload_hook)(struct sk_buff *skb)); |
249 | extern int l2tp_session_queue_purge(struct l2tp_session *session); |
250 | extern int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb); |
251 | |
252 | extern int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len); |
253 | |
254 | extern int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops); |
255 | extern void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type); |
256 | |
257 | /* Session reference counts. Incremented when code obtains a reference |
258 | * to a session. |
259 | */ |
260 | static inline void l2tp_session_inc_refcount_1(struct l2tp_session *session) |
261 | { |
262 | atomic_inc(&session->ref_count); |
263 | } |
264 | |
265 | static inline void l2tp_session_dec_refcount_1(struct l2tp_session *session) |
266 | { |
267 | if (atomic_dec_and_test(&session->ref_count)) |
268 | l2tp_session_free(session); |
269 | } |
270 | |
271 | #ifdef L2TP_REFCNT_DEBUG |
272 | #define l2tp_session_inc_refcount(_s) \ |
273 | do { \ |
274 | pr_debug("l2tp_session_inc_refcount: %s:%d %s: cnt=%d\n", \ |
275 | __func__, __LINE__, (_s)->name, \ |
276 | atomic_read(&_s->ref_count)); \ |
277 | l2tp_session_inc_refcount_1(_s); \ |
278 | } while (0) |
279 | #define l2tp_session_dec_refcount(_s) \ |
280 | do { \ |
281 | pr_debug("l2tp_session_dec_refcount: %s:%d %s: cnt=%d\n", \ |
282 | __func__, __LINE__, (_s)->name, \ |
283 | atomic_read(&_s->ref_count)); \ |
284 | l2tp_session_dec_refcount_1(_s); \ |
285 | } while (0) |
286 | #else |
287 | #define l2tp_session_inc_refcount(s) l2tp_session_inc_refcount_1(s) |
288 | #define l2tp_session_dec_refcount(s) l2tp_session_dec_refcount_1(s) |
289 | #endif |
290 | |
291 | #define l2tp_printk(ptr, type, func, fmt, ...) \ |
292 | do { \ |
293 | if (((ptr)->debug) & (type)) \ |
294 | func(fmt, ##__VA_ARGS__); \ |
295 | } while (0) |
296 | |
297 | #define l2tp_warn(ptr, type, fmt, ...) \ |
298 | l2tp_printk(ptr, type, pr_warn, fmt, ##__VA_ARGS__) |
299 | #define l2tp_info(ptr, type, fmt, ...) \ |
300 | l2tp_printk(ptr, type, pr_info, fmt, ##__VA_ARGS__) |
301 | #define l2tp_dbg(ptr, type, fmt, ...) \ |
302 | l2tp_printk(ptr, type, pr_debug, fmt, ##__VA_ARGS__) |
303 | |
304 | #endif /* _L2TP_CORE_H_ */ |
305 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9