1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Declarations of X.25 Packet Layer type objects.
4 *
5 * History
6 * nov/17/96 Jonathan Naylor Initial version.
7 * mar/20/00 Daniela Squassoni Disabling/enabling of facilities
8 * negotiation.
9 */
10
11 #ifndef _X25_H
12 #define _X25_H
13 #include <linux/x25.h>
14 #include <linux/slab.h>
15 #include <linux/refcount.h>
16 #include <net/sock.h>
17
18 #define X25_ADDR_LEN 16
19
20 #define X25_MAX_L2_LEN 18 /* 802.2 LLC */
21
22 #define X25_STD_MIN_LEN 3
23 #define X25_EXT_MIN_LEN 4
24
25 #define X25_GFI_SEQ_MASK 0x30
26 #define X25_GFI_STDSEQ 0x10
27 #define X25_GFI_EXTSEQ 0x20
28
29 #define X25_Q_BIT 0x80
30 #define X25_D_BIT 0x40
31 #define X25_STD_M_BIT 0x10
32 #define X25_EXT_M_BIT 0x01
33
34 #define X25_CALL_REQUEST 0x0B
35 #define X25_CALL_ACCEPTED 0x0F
36 #define X25_CLEAR_REQUEST 0x13
37 #define X25_CLEAR_CONFIRMATION 0x17
38 #define X25_DATA 0x00
39 #define X25_INTERRUPT 0x23
40 #define X25_INTERRUPT_CONFIRMATION 0x27
41 #define X25_RR 0x01
42 #define X25_RNR 0x05
43 #define X25_REJ 0x09
44 #define X25_RESET_REQUEST 0x1B
45 #define X25_RESET_CONFIRMATION 0x1F
46 #define X25_REGISTRATION_REQUEST 0xF3
47 #define X25_REGISTRATION_CONFIRMATION 0xF7
48 #define X25_RESTART_REQUEST 0xFB
49 #define X25_RESTART_CONFIRMATION 0xFF
50 #define X25_DIAGNOSTIC 0xF1
51 #define X25_ILLEGAL 0xFD
52
53 /* Define the various conditions that may exist */
54
55 #define X25_COND_ACK_PENDING 0x01
56 #define X25_COND_OWN_RX_BUSY 0x02
57 #define X25_COND_PEER_RX_BUSY 0x04
58
59 /* Define Link State constants. */
60 enum {
61 X25_STATE_0, /* Ready */
62 X25_STATE_1, /* Awaiting Call Accepted */
63 X25_STATE_2, /* Awaiting Clear Confirmation */
64 X25_STATE_3, /* Data Transfer */
65 X25_STATE_4, /* Awaiting Reset Confirmation */
66 X25_STATE_5 /* Call Accepted / Call Connected pending */
67 };
68
69 enum {
70 X25_LINK_STATE_0,
71 X25_LINK_STATE_1,
72 X25_LINK_STATE_2,
73 X25_LINK_STATE_3
74 };
75
76 #define X25_DEFAULT_T20 (180 * HZ) /* Default T20 value */
77 #define X25_DEFAULT_T21 (200 * HZ) /* Default T21 value */
78 #define X25_DEFAULT_T22 (180 * HZ) /* Default T22 value */
79 #define X25_DEFAULT_T23 (180 * HZ) /* Default T23 value */
80 #define X25_DEFAULT_T2 (3 * HZ) /* Default ack holdback value */
81
82 #define X25_DEFAULT_WINDOW_SIZE 2 /* Default Window Size */
83 #define X25_DEFAULT_PACKET_SIZE X25_PS128 /* Default Packet Size */
84 #define X25_DEFAULT_THROUGHPUT 0x0A /* Deafult Throughput */
85 #define X25_DEFAULT_REVERSE 0x00 /* Default Reverse Charging */
86
87 #define X25_SMODULUS 8
88 #define X25_EMODULUS 128
89
90 /*
91 * X.25 Facilities constants.
92 */
93
94 #define X25_FAC_CLASS_MASK 0xC0
95
96 #define X25_FAC_CLASS_A 0x00
97 #define X25_FAC_CLASS_B 0x40
98 #define X25_FAC_CLASS_C 0x80
99 #define X25_FAC_CLASS_D 0xC0
100
101 #define X25_FAC_REVERSE 0x01 /* also fast select */
102 #define X25_FAC_THROUGHPUT 0x02
103 #define X25_FAC_PACKET_SIZE 0x42
104 #define X25_FAC_WINDOW_SIZE 0x43
105
106 #define X25_MAX_FAC_LEN 60
107 #define X25_MAX_CUD_LEN 128
108
109 #define X25_FAC_CALLING_AE 0xCB
110 #define X25_FAC_CALLED_AE 0xC9
111
112 #define X25_MARKER 0x00
113 #define X25_DTE_SERVICES 0x0F
114 #define X25_MAX_AE_LEN 40 /* Max num of semi-octets in AE - OSI Nw */
115 #define X25_MAX_DTE_FACIL_LEN 21 /* Max length of DTE facility params */
116
117 /* Bitset in x25_sock->flags for misc flags */
118 #define X25_Q_BIT_FLAG 0
119 #define X25_INTERRUPT_FLAG 1
120 #define X25_ACCPT_APPRV_FLAG 2
121
122 /**
123 * struct x25_route - x25 routing entry
124 * @node - entry in x25_list_lock
125 * @address - Start of address range
126 * @sigdigits - Number of sig digits
127 * @dev - More than one for MLP
128 * @refcnt - reference counter
129 */
130 struct x25_route {
131 struct list_head node;
132 struct x25_address address;
133 unsigned int sigdigits;
134 struct net_device *dev;
135 refcount_t refcnt;
136 };
137
138 struct x25_neigh {
139 struct list_head node;
140 struct net_device *dev;
141 unsigned int state;
142 unsigned int extended;
143 struct sk_buff_head queue;
144 unsigned long t20;
145 struct timer_list t20timer;
146 unsigned long global_facil_mask;
147 refcount_t refcnt;
148 };
149
150 struct x25_sock {
151 struct sock sk;
152 struct x25_address source_addr, dest_addr;
153 struct x25_neigh *neighbour;
154 unsigned int lci, cudmatchlength;
155 unsigned char state, condition;
156 unsigned short vs, vr, va, vl;
157 unsigned long t2, t21, t22, t23;
158 unsigned short fraglen;
159 unsigned long flags;
160 struct sk_buff_head ack_queue;
161 struct sk_buff_head fragment_queue;
162 struct sk_buff_head interrupt_in_queue;
163 struct sk_buff_head interrupt_out_queue;
164 struct timer_list timer;
165 struct x25_causediag causediag;
166 struct x25_facilities facilities;
167 struct x25_dte_facilities dte_facilities;
168 struct x25_calluserdata calluserdata;
169 unsigned long vc_facil_mask; /* inc_call facilities mask */
170 };
171
172 struct x25_forward {
173 struct list_head node;
174 unsigned int lci;
175 struct net_device *dev1;
176 struct net_device *dev2;
177 atomic_t refcnt;
178 };
179
x25_sk(const struct sock * sk)180 static inline struct x25_sock *x25_sk(const struct sock *sk)
181 {
182 return (struct x25_sock *)sk;
183 }
184
185 /* af_x25.c */
186 extern int sysctl_x25_restart_request_timeout;
187 extern int sysctl_x25_call_request_timeout;
188 extern int sysctl_x25_reset_request_timeout;
189 extern int sysctl_x25_clear_request_timeout;
190 extern int sysctl_x25_ack_holdback_timeout;
191 extern int sysctl_x25_forward;
192
193 int x25_parse_address_block(struct sk_buff *skb,
194 struct x25_address *called_addr,
195 struct x25_address *calling_addr);
196
197 int x25_addr_ntoa(unsigned char *, struct x25_address *, struct x25_address *);
198 int x25_addr_aton(unsigned char *, struct x25_address *, struct x25_address *);
199 struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
200 void x25_destroy_socket_from_timer(struct sock *);
201 int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
202 void x25_kill_by_neigh(struct x25_neigh *);
203
204 /* x25_dev.c */
205 void x25_send_frame(struct sk_buff *, struct x25_neigh *);
206 int x25_lapb_receive_frame(struct sk_buff *, struct net_device *,
207 struct packet_type *, struct net_device *);
208 void x25_establish_link(struct x25_neigh *);
209 void x25_terminate_link(struct x25_neigh *);
210
211 /* x25_facilities.c */
212 int x25_parse_facilities(struct sk_buff *, struct x25_facilities *,
213 struct x25_dte_facilities *, unsigned long *);
214 int x25_create_facilities(unsigned char *, struct x25_facilities *,
215 struct x25_dte_facilities *, unsigned long);
216 int x25_negotiate_facilities(struct sk_buff *, struct sock *,
217 struct x25_facilities *,
218 struct x25_dte_facilities *);
219 void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);
220
221 /* x25_forward.c */
222 void x25_clear_forward_by_lci(unsigned int lci);
223 void x25_clear_forward_by_dev(struct net_device *);
224 int x25_forward_data(int, struct x25_neigh *, struct sk_buff *);
225 int x25_forward_call(struct x25_address *, struct x25_neigh *, struct sk_buff *,
226 int);
227
228 /* x25_in.c */
229 int x25_process_rx_frame(struct sock *, struct sk_buff *);
230 int x25_backlog_rcv(struct sock *, struct sk_buff *);
231
232 /* x25_link.c */
233 void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
234 void x25_link_device_up(struct net_device *);
235 void x25_link_device_down(struct net_device *);
236 void x25_link_established(struct x25_neigh *);
237 void x25_link_terminated(struct x25_neigh *);
238 void x25_transmit_clear_request(struct x25_neigh *, unsigned int,
239 unsigned char);
240 void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
241 int x25_subscr_ioctl(unsigned int, void __user *);
242 struct x25_neigh *x25_get_neigh(struct net_device *);
243 void x25_link_free(void);
244
245 /* x25_neigh.c */
x25_neigh_hold(struct x25_neigh * nb)246 static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
247 {
248 refcount_inc(&nb->refcnt);
249 }
250
x25_neigh_put(struct x25_neigh * nb)251 static __inline__ void x25_neigh_put(struct x25_neigh *nb)
252 {
253 if (refcount_dec_and_test(&nb->refcnt))
254 kfree(nb);
255 }
256
257 /* x25_out.c */
258 int x25_output(struct sock *, struct sk_buff *);
259 void x25_kick(struct sock *);
260 void x25_enquiry_response(struct sock *);
261
262 /* x25_route.c */
263 struct x25_route *x25_get_route(struct x25_address *addr);
264 struct net_device *x25_dev_get(char *);
265 void x25_route_device_down(struct net_device *dev);
266 int x25_route_ioctl(unsigned int, void __user *);
267 void x25_route_free(void);
268
x25_route_hold(struct x25_route * rt)269 static __inline__ void x25_route_hold(struct x25_route *rt)
270 {
271 refcount_inc(&rt->refcnt);
272 }
273
x25_route_put(struct x25_route * rt)274 static __inline__ void x25_route_put(struct x25_route *rt)
275 {
276 if (refcount_dec_and_test(&rt->refcnt))
277 kfree(rt);
278 }
279
280 /* x25_subr.c */
281 void x25_clear_queues(struct sock *);
282 void x25_frames_acked(struct sock *, unsigned short);
283 void x25_requeue_frames(struct sock *);
284 int x25_validate_nr(struct sock *, unsigned short);
285 void x25_write_internal(struct sock *, int);
286 int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *,
287 int *);
288 void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
289
290 /* x25_timer.c */
291 void x25_init_timers(struct sock *sk);
292 void x25_start_heartbeat(struct sock *);
293 void x25_start_t2timer(struct sock *);
294 void x25_start_t21timer(struct sock *);
295 void x25_start_t22timer(struct sock *);
296 void x25_start_t23timer(struct sock *);
297 void x25_stop_heartbeat(struct sock *);
298 void x25_stop_timer(struct sock *);
299 unsigned long x25_display_timer(struct sock *);
300 void x25_check_rbuf(struct sock *);
301
302 /* sysctl_net_x25.c */
303 #ifdef CONFIG_SYSCTL
304 int x25_register_sysctl(void);
305 void x25_unregister_sysctl(void);
306 #else
x25_register_sysctl(void)307 static inline int x25_register_sysctl(void) { return 0; };
x25_unregister_sysctl(void)308 static inline void x25_unregister_sysctl(void) {};
309 #endif /* CONFIG_SYSCTL */
310
311 struct x25_skb_cb {
312 unsigned int flags;
313 };
314 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))
315
316 extern struct hlist_head x25_list;
317 extern rwlock_t x25_list_lock;
318 extern struct list_head x25_route_list;
319 extern rwlock_t x25_route_list_lock;
320 extern struct list_head x25_forward_list;
321 extern rwlock_t x25_forward_list_lock;
322 extern struct list_head x25_neigh_list;
323 extern rwlock_t x25_neigh_list_lock;
324
325 int x25_proc_init(void);
326 void x25_proc_exit(void);
327 #endif
328