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 };
67
68 enum {
69 X25_LINK_STATE_0,
70 X25_LINK_STATE_1,
71 X25_LINK_STATE_2,
72 X25_LINK_STATE_3
73 };
74
75 #define X25_DEFAULT_T20 (180 * HZ) /* Default T20 value */
76 #define X25_DEFAULT_T21 (200 * HZ) /* Default T21 value */
77 #define X25_DEFAULT_T22 (180 * HZ) /* Default T22 value */
78 #define X25_DEFAULT_T23 (180 * HZ) /* Default T23 value */
79 #define X25_DEFAULT_T2 (3 * HZ) /* Default ack holdback value */
80
81 #define X25_DEFAULT_WINDOW_SIZE 2 /* Default Window Size */
82 #define X25_DEFAULT_PACKET_SIZE X25_PS128 /* Default Packet Size */
83 #define X25_DEFAULT_THROUGHPUT 0x0A /* Deafult Throughput */
84 #define X25_DEFAULT_REVERSE 0x00 /* Default Reverse Charging */
85
86 #define X25_SMODULUS 8
87 #define X25_EMODULUS 128
88
89 /*
90 * X.25 Facilities constants.
91 */
92
93 #define X25_FAC_CLASS_MASK 0xC0
94
95 #define X25_FAC_CLASS_A 0x00
96 #define X25_FAC_CLASS_B 0x40
97 #define X25_FAC_CLASS_C 0x80
98 #define X25_FAC_CLASS_D 0xC0
99
100 #define X25_FAC_REVERSE 0x01 /* also fast select */
101 #define X25_FAC_THROUGHPUT 0x02
102 #define X25_FAC_PACKET_SIZE 0x42
103 #define X25_FAC_WINDOW_SIZE 0x43
104
105 #define X25_MAX_FAC_LEN 60
106 #define X25_MAX_CUD_LEN 128
107
108 #define X25_FAC_CALLING_AE 0xCB
109 #define X25_FAC_CALLED_AE 0xC9
110
111 #define X25_MARKER 0x00
112 #define X25_DTE_SERVICES 0x0F
113 #define X25_MAX_AE_LEN 40 /* Max num of semi-octets in AE - OSI Nw */
114 #define X25_MAX_DTE_FACIL_LEN 21 /* Max length of DTE facility params */
115
116 /* Bitset in x25_sock->flags for misc flags */
117 #define X25_Q_BIT_FLAG 0
118 #define X25_INTERRUPT_FLAG 1
119 #define X25_ACCPT_APPRV_FLAG 2
120
121 /**
122 * struct x25_route - x25 routing entry
123 * @node - entry in x25_list_lock
124 * @address - Start of address range
125 * @sigdigits - Number of sig digits
126 * @dev - More than one for MLP
127 * @refcnt - reference counter
128 */
129 struct x25_route {
130 struct list_head node;
131 struct x25_address address;
132 unsigned int sigdigits;
133 struct net_device *dev;
134 refcount_t refcnt;
135 };
136
137 struct x25_neigh {
138 struct list_head node;
139 struct net_device *dev;
140 unsigned int state;
141 unsigned int extended;
142 struct sk_buff_head queue;
143 unsigned long t20;
144 struct timer_list t20timer;
145 unsigned long global_facil_mask;
146 refcount_t refcnt;
147 };
148
149 struct x25_sock {
150 struct sock sk;
151 struct x25_address source_addr, dest_addr;
152 struct x25_neigh *neighbour;
153 unsigned int lci, cudmatchlength;
154 unsigned char state, condition;
155 unsigned short vs, vr, va, vl;
156 unsigned long t2, t21, t22, t23;
157 unsigned short fraglen;
158 unsigned long flags;
159 struct sk_buff_head ack_queue;
160 struct sk_buff_head fragment_queue;
161 struct sk_buff_head interrupt_in_queue;
162 struct sk_buff_head interrupt_out_queue;
163 struct timer_list timer;
164 struct x25_causediag causediag;
165 struct x25_facilities facilities;
166 struct x25_dte_facilities dte_facilities;
167 struct x25_calluserdata calluserdata;
168 unsigned long vc_facil_mask; /* inc_call facilities mask */
169 };
170
171 struct x25_forward {
172 struct list_head node;
173 unsigned int lci;
174 struct net_device *dev1;
175 struct net_device *dev2;
176 atomic_t refcnt;
177 };
178
x25_sk(const struct sock * sk)179 static inline struct x25_sock *x25_sk(const struct sock *sk)
180 {
181 return (struct x25_sock *)sk;
182 }
183
184 /* af_x25.c */
185 extern int sysctl_x25_restart_request_timeout;
186 extern int sysctl_x25_call_request_timeout;
187 extern int sysctl_x25_reset_request_timeout;
188 extern int sysctl_x25_clear_request_timeout;
189 extern int sysctl_x25_ack_holdback_timeout;
190 extern int sysctl_x25_forward;
191
192 int x25_parse_address_block(struct sk_buff *skb,
193 struct x25_address *called_addr,
194 struct x25_address *calling_addr);
195
196 int x25_addr_ntoa(unsigned char *, struct x25_address *, struct x25_address *);
197 int x25_addr_aton(unsigned char *, struct x25_address *, struct x25_address *);
198 struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
199 void x25_destroy_socket_from_timer(struct sock *);
200 int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
201 void x25_kill_by_neigh(struct x25_neigh *);
202
203 /* x25_dev.c */
204 void x25_send_frame(struct sk_buff *, struct x25_neigh *);
205 int x25_lapb_receive_frame(struct sk_buff *, struct net_device *,
206 struct packet_type *, struct net_device *);
207 void x25_establish_link(struct x25_neigh *);
208 void x25_terminate_link(struct x25_neigh *);
209
210 /* x25_facilities.c */
211 int x25_parse_facilities(struct sk_buff *, struct x25_facilities *,
212 struct x25_dte_facilities *, unsigned long *);
213 int x25_create_facilities(unsigned char *, struct x25_facilities *,
214 struct x25_dte_facilities *, unsigned long);
215 int x25_negotiate_facilities(struct sk_buff *, struct sock *,
216 struct x25_facilities *,
217 struct x25_dte_facilities *);
218 void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);
219
220 /* x25_forward.c */
221 void x25_clear_forward_by_lci(unsigned int lci);
222 void x25_clear_forward_by_dev(struct net_device *);
223 int x25_forward_data(int, struct x25_neigh *, struct sk_buff *);
224 int x25_forward_call(struct x25_address *, struct x25_neigh *, struct sk_buff *,
225 int);
226
227 /* x25_in.c */
228 int x25_process_rx_frame(struct sock *, struct sk_buff *);
229 int x25_backlog_rcv(struct sock *, struct sk_buff *);
230
231 /* x25_link.c */
232 void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
233 void x25_link_device_up(struct net_device *);
234 void x25_link_device_down(struct net_device *);
235 void x25_link_established(struct x25_neigh *);
236 void x25_link_terminated(struct x25_neigh *);
237 void x25_transmit_clear_request(struct x25_neigh *, unsigned int,
238 unsigned char);
239 void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
240 int x25_subscr_ioctl(unsigned int, void __user *);
241 struct x25_neigh *x25_get_neigh(struct net_device *);
242 void x25_link_free(void);
243
244 /* x25_neigh.c */
x25_neigh_hold(struct x25_neigh * nb)245 static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
246 {
247 refcount_inc(&nb->refcnt);
248 }
249
x25_neigh_put(struct x25_neigh * nb)250 static __inline__ void x25_neigh_put(struct x25_neigh *nb)
251 {
252 if (refcount_dec_and_test(&nb->refcnt))
253 kfree(nb);
254 }
255
256 /* x25_out.c */
257 int x25_output(struct sock *, struct sk_buff *);
258 void x25_kick(struct sock *);
259 void x25_enquiry_response(struct sock *);
260
261 /* x25_route.c */
262 struct x25_route *x25_get_route(struct x25_address *addr);
263 struct net_device *x25_dev_get(char *);
264 void x25_route_device_down(struct net_device *dev);
265 int x25_route_ioctl(unsigned int, void __user *);
266 void x25_route_free(void);
267
x25_route_hold(struct x25_route * rt)268 static __inline__ void x25_route_hold(struct x25_route *rt)
269 {
270 refcount_inc(&rt->refcnt);
271 }
272
x25_route_put(struct x25_route * rt)273 static __inline__ void x25_route_put(struct x25_route *rt)
274 {
275 if (refcount_dec_and_test(&rt->refcnt))
276 kfree(rt);
277 }
278
279 /* x25_subr.c */
280 void x25_clear_queues(struct sock *);
281 void x25_frames_acked(struct sock *, unsigned short);
282 void x25_requeue_frames(struct sock *);
283 int x25_validate_nr(struct sock *, unsigned short);
284 void x25_write_internal(struct sock *, int);
285 int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *,
286 int *);
287 void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
288
289 /* x25_timer.c */
290 void x25_init_timers(struct sock *sk);
291 void x25_start_heartbeat(struct sock *);
292 void x25_start_t2timer(struct sock *);
293 void x25_start_t21timer(struct sock *);
294 void x25_start_t22timer(struct sock *);
295 void x25_start_t23timer(struct sock *);
296 void x25_stop_heartbeat(struct sock *);
297 void x25_stop_timer(struct sock *);
298 unsigned long x25_display_timer(struct sock *);
299 void x25_check_rbuf(struct sock *);
300
301 /* sysctl_net_x25.c */
302 #ifdef CONFIG_SYSCTL
303 int x25_register_sysctl(void);
304 void x25_unregister_sysctl(void);
305 #else
x25_register_sysctl(void)306 static inline int x25_register_sysctl(void) { return 0; };
x25_unregister_sysctl(void)307 static inline void x25_unregister_sysctl(void) {};
308 #endif /* CONFIG_SYSCTL */
309
310 struct x25_skb_cb {
311 unsigned int flags;
312 };
313 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))
314
315 extern struct hlist_head x25_list;
316 extern rwlock_t x25_list_lock;
317 extern struct list_head x25_route_list;
318 extern rwlock_t x25_route_list_lock;
319 extern struct list_head x25_forward_list;
320 extern rwlock_t x25_forward_list_lock;
321 extern struct list_head x25_neigh_list;
322 extern rwlock_t x25_neigh_list_lock;
323
324 int x25_proc_init(void);
325 void x25_proc_exit(void);
326 #endif
327