1 /*
2 * Declarations of X.25 Packet Layer type objects.
3 *
4 * History
5 * nov/17/96 Jonathan Naylor Initial version.
6 * mar/20/00 Daniela Squassoni Disabling/enabling of facilities
7 * negotiation.
8 */
9
10 #ifndef _X25_H
11 #define _X25_H
12 #include <linux/x25.h>
13 #include <linux/slab.h>
14 #include <net/sock.h>
15
16 #define X25_ADDR_LEN 16
17
18 #define X25_MAX_L2_LEN 18 /* 802.2 LLC */
19
20 #define X25_STD_MIN_LEN 3
21 #define X25_EXT_MIN_LEN 4
22
23 #define X25_GFI_SEQ_MASK 0x30
24 #define X25_GFI_STDSEQ 0x10
25 #define X25_GFI_EXTSEQ 0x20
26
27 #define X25_Q_BIT 0x80
28 #define X25_D_BIT 0x40
29 #define X25_STD_M_BIT 0x10
30 #define X25_EXT_M_BIT 0x01
31
32 #define X25_CALL_REQUEST 0x0B
33 #define X25_CALL_ACCEPTED 0x0F
34 #define X25_CLEAR_REQUEST 0x13
35 #define X25_CLEAR_CONFIRMATION 0x17
36 #define X25_DATA 0x00
37 #define X25_INTERRUPT 0x23
38 #define X25_INTERRUPT_CONFIRMATION 0x27
39 #define X25_RR 0x01
40 #define X25_RNR 0x05
41 #define X25_REJ 0x09
42 #define X25_RESET_REQUEST 0x1B
43 #define X25_RESET_CONFIRMATION 0x1F
44 #define X25_REGISTRATION_REQUEST 0xF3
45 #define X25_REGISTRATION_CONFIRMATION 0xF7
46 #define X25_RESTART_REQUEST 0xFB
47 #define X25_RESTART_CONFIRMATION 0xFF
48 #define X25_DIAGNOSTIC 0xF1
49 #define X25_ILLEGAL 0xFD
50
51 /* Define the various conditions that may exist */
52
53 #define X25_COND_ACK_PENDING 0x01
54 #define X25_COND_OWN_RX_BUSY 0x02
55 #define X25_COND_PEER_RX_BUSY 0x04
56
57 /* Define Link State constants. */
58 enum {
59 X25_STATE_0, /* Ready */
60 X25_STATE_1, /* Awaiting Call Accepted */
61 X25_STATE_2, /* Awaiting Clear Confirmation */
62 X25_STATE_3, /* Data Transfer */
63 X25_STATE_4 /* Awaiting Reset Confirmation */
64 };
65
66 enum {
67 X25_LINK_STATE_0,
68 X25_LINK_STATE_1,
69 X25_LINK_STATE_2,
70 X25_LINK_STATE_3
71 };
72
73 #define X25_DEFAULT_T20 (180 * HZ) /* Default T20 value */
74 #define X25_DEFAULT_T21 (200 * HZ) /* Default T21 value */
75 #define X25_DEFAULT_T22 (180 * HZ) /* Default T22 value */
76 #define X25_DEFAULT_T23 (180 * HZ) /* Default T23 value */
77 #define X25_DEFAULT_T2 (3 * HZ) /* Default ack holdback value */
78
79 #define X25_DEFAULT_WINDOW_SIZE 2 /* Default Window Size */
80 #define X25_DEFAULT_PACKET_SIZE X25_PS128 /* Default Packet Size */
81 #define X25_DEFAULT_THROUGHPUT 0x0A /* Deafult Throughput */
82 #define X25_DEFAULT_REVERSE 0x00 /* Default Reverse Charging */
83
84 #define X25_SMODULUS 8
85 #define X25_EMODULUS 128
86
87 /*
88 * X.25 Facilities constants.
89 */
90
91 #define X25_FAC_CLASS_MASK 0xC0
92
93 #define X25_FAC_CLASS_A 0x00
94 #define X25_FAC_CLASS_B 0x40
95 #define X25_FAC_CLASS_C 0x80
96 #define X25_FAC_CLASS_D 0xC0
97
98 #define X25_FAC_REVERSE 0x01 /* also fast select */
99 #define X25_FAC_THROUGHPUT 0x02
100 #define X25_FAC_PACKET_SIZE 0x42
101 #define X25_FAC_WINDOW_SIZE 0x43
102
103 #define X25_MAX_FAC_LEN 60
104 #define X25_MAX_CUD_LEN 128
105
106 #define X25_FAC_CALLING_AE 0xCB
107 #define X25_FAC_CALLED_AE 0xC9
108
109 #define X25_MARKER 0x00
110 #define X25_DTE_SERVICES 0x0F
111 #define X25_MAX_AE_LEN 40 /* Max num of semi-octets in AE - OSI Nw */
112 #define X25_MAX_DTE_FACIL_LEN 21 /* Max length of DTE facility params */
113
114 /* Bitset in x25_sock->flags for misc flags */
115 #define X25_Q_BIT_FLAG 0
116 #define X25_INTERRUPT_FLAG 1
117 #define X25_ACCPT_APPRV_FLAG 2
118
119 /**
120 * struct x25_route - x25 routing entry
121 * @node - entry in x25_list_lock
122 * @address - Start of address range
123 * @sigdigits - Number of sig digits
124 * @dev - More than one for MLP
125 * @refcnt - reference counter
126 */
127 struct x25_route {
128 struct list_head node;
129 struct x25_address address;
130 unsigned int sigdigits;
131 struct net_device *dev;
132 atomic_t refcnt;
133 };
134
135 struct x25_neigh {
136 struct list_head node;
137 struct net_device *dev;
138 unsigned int state;
139 unsigned int extended;
140 struct sk_buff_head queue;
141 unsigned long t20;
142 struct timer_list t20timer;
143 unsigned long global_facil_mask;
144 atomic_t refcnt;
145 };
146
147 struct x25_sock {
148 struct sock sk;
149 struct x25_address source_addr, dest_addr;
150 struct x25_neigh *neighbour;
151 unsigned int lci, cudmatchlength;
152 unsigned char state, condition;
153 unsigned short vs, vr, va, vl;
154 unsigned long t2, t21, t22, t23;
155 unsigned short fraglen;
156 unsigned long flags;
157 struct sk_buff_head ack_queue;
158 struct sk_buff_head fragment_queue;
159 struct sk_buff_head interrupt_in_queue;
160 struct sk_buff_head interrupt_out_queue;
161 struct timer_list timer;
162 struct x25_causediag causediag;
163 struct x25_facilities facilities;
164 struct x25_dte_facilities dte_facilities;
165 struct x25_calluserdata calluserdata;
166 unsigned long vc_facil_mask; /* inc_call facilities mask */
167 };
168
169 struct x25_forward {
170 struct list_head node;
171 unsigned int lci;
172 struct net_device *dev1;
173 struct net_device *dev2;
174 atomic_t refcnt;
175 };
176
x25_sk(const struct sock * sk)177 static inline struct x25_sock *x25_sk(const struct sock *sk)
178 {
179 return (struct x25_sock *)sk;
180 }
181
182 /* af_x25.c */
183 extern int sysctl_x25_restart_request_timeout;
184 extern int sysctl_x25_call_request_timeout;
185 extern int sysctl_x25_reset_request_timeout;
186 extern int sysctl_x25_clear_request_timeout;
187 extern int sysctl_x25_ack_holdback_timeout;
188 extern int sysctl_x25_forward;
189
190 extern int x25_parse_address_block(struct sk_buff *skb,
191 struct x25_address *called_addr,
192 struct x25_address *calling_addr);
193
194 extern int x25_addr_ntoa(unsigned char *, struct x25_address *,
195 struct x25_address *);
196 extern int x25_addr_aton(unsigned char *, struct x25_address *,
197 struct x25_address *);
198 extern struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
199 extern void x25_destroy_socket_from_timer(struct sock *);
200 extern int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
201 extern void x25_kill_by_neigh(struct x25_neigh *);
202
203 /* x25_dev.c */
204 extern void x25_send_frame(struct sk_buff *, struct x25_neigh *);
205 extern int x25_lapb_receive_frame(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
206 extern void x25_establish_link(struct x25_neigh *);
207 extern void x25_terminate_link(struct x25_neigh *);
208
209 /* x25_facilities.c */
210 extern int x25_parse_facilities(struct sk_buff *, struct x25_facilities *,
211 struct x25_dte_facilities *, unsigned long *);
212 extern int x25_create_facilities(unsigned char *, struct x25_facilities *,
213 struct x25_dte_facilities *, unsigned long);
214 extern int x25_negotiate_facilities(struct sk_buff *, struct sock *,
215 struct x25_facilities *,
216 struct x25_dte_facilities *);
217 extern void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);
218
219 /* x25_forward.c */
220 extern void x25_clear_forward_by_lci(unsigned int lci);
221 extern void x25_clear_forward_by_dev(struct net_device *);
222 extern int x25_forward_data(int, struct x25_neigh *, struct sk_buff *);
223 extern int x25_forward_call(struct x25_address *, struct x25_neigh *,
224 struct sk_buff *, int);
225
226 /* x25_in.c */
227 extern int x25_process_rx_frame(struct sock *, struct sk_buff *);
228 extern int x25_backlog_rcv(struct sock *, struct sk_buff *);
229
230 /* x25_link.c */
231 extern void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
232 extern void x25_link_device_up(struct net_device *);
233 extern void x25_link_device_down(struct net_device *);
234 extern void x25_link_established(struct x25_neigh *);
235 extern void x25_link_terminated(struct x25_neigh *);
236 extern void x25_transmit_clear_request(struct x25_neigh *, unsigned int, unsigned char);
237 extern void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
238 extern int x25_subscr_ioctl(unsigned int, void __user *);
239 extern struct x25_neigh *x25_get_neigh(struct net_device *);
240 extern void x25_link_free(void);
241
242 /* x25_neigh.c */
x25_neigh_hold(struct x25_neigh * nb)243 static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
244 {
245 atomic_inc(&nb->refcnt);
246 }
247
x25_neigh_put(struct x25_neigh * nb)248 static __inline__ void x25_neigh_put(struct x25_neigh *nb)
249 {
250 if (atomic_dec_and_test(&nb->refcnt))
251 kfree(nb);
252 }
253
254 /* x25_out.c */
255 extern int x25_output(struct sock *, struct sk_buff *);
256 extern void x25_kick(struct sock *);
257 extern void x25_enquiry_response(struct sock *);
258
259 /* x25_route.c */
260 extern struct x25_route *x25_get_route(struct x25_address *addr);
261 extern struct net_device *x25_dev_get(char *);
262 extern void x25_route_device_down(struct net_device *dev);
263 extern int x25_route_ioctl(unsigned int, void __user *);
264 extern void x25_route_free(void);
265
x25_route_hold(struct x25_route * rt)266 static __inline__ void x25_route_hold(struct x25_route *rt)
267 {
268 atomic_inc(&rt->refcnt);
269 }
270
x25_route_put(struct x25_route * rt)271 static __inline__ void x25_route_put(struct x25_route *rt)
272 {
273 if (atomic_dec_and_test(&rt->refcnt))
274 kfree(rt);
275 }
276
277 /* x25_subr.c */
278 extern void x25_clear_queues(struct sock *);
279 extern void x25_frames_acked(struct sock *, unsigned short);
280 extern void x25_requeue_frames(struct sock *);
281 extern int x25_validate_nr(struct sock *, unsigned short);
282 extern void x25_write_internal(struct sock *, int);
283 extern int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *, int *);
284 extern void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
285
286 /* x25_timer.c */
287 extern void x25_init_timers(struct sock *sk);
288 extern void x25_start_heartbeat(struct sock *);
289 extern void x25_start_t2timer(struct sock *);
290 extern void x25_start_t21timer(struct sock *);
291 extern void x25_start_t22timer(struct sock *);
292 extern void x25_start_t23timer(struct sock *);
293 extern void x25_stop_heartbeat(struct sock *);
294 extern void x25_stop_timer(struct sock *);
295 extern unsigned long x25_display_timer(struct sock *);
296 extern void x25_check_rbuf(struct sock *);
297
298 /* sysctl_net_x25.c */
299 #ifdef CONFIG_SYSCTL
300 extern void x25_register_sysctl(void);
301 extern void x25_unregister_sysctl(void);
302 #else
x25_register_sysctl(void)303 static inline void x25_register_sysctl(void) {};
x25_unregister_sysctl(void)304 static inline void x25_unregister_sysctl(void) {};
305 #endif /* CONFIG_SYSCTL */
306
307 struct x25_skb_cb {
308 unsigned int flags;
309 };
310 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))
311
312 extern struct hlist_head x25_list;
313 extern rwlock_t x25_list_lock;
314 extern struct list_head x25_route_list;
315 extern rwlock_t x25_route_list_lock;
316 extern struct list_head x25_forward_list;
317 extern rwlock_t x25_forward_list_lock;
318 extern struct list_head x25_neigh_list;
319 extern rwlock_t x25_neigh_list_lock;
320
321 extern int x25_proc_init(void);
322 extern void x25_proc_exit(void);
323 #endif
324