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
14 #define X25_ADDR_LEN 16
15
16 #define X25_MAX_L2_LEN 18 /* 802.2 LLC */
17
18 #define X25_STD_MIN_LEN 3
19 #define X25_EXT_MIN_LEN 4
20
21 #define X25_GFI_SEQ_MASK 0x30
22 #define X25_GFI_STDSEQ 0x10
23 #define X25_GFI_EXTSEQ 0x20
24
25 #define X25_Q_BIT 0x80
26 #define X25_D_BIT 0x40
27 #define X25_STD_M_BIT 0x10
28 #define X25_EXT_M_BIT 0x01
29
30 #define X25_CALL_REQUEST 0x0B
31 #define X25_CALL_ACCEPTED 0x0F
32 #define X25_CLEAR_REQUEST 0x13
33 #define X25_CLEAR_CONFIRMATION 0x17
34 #define X25_DATA 0x00
35 #define X25_INTERRUPT 0x23
36 #define X25_INTERRUPT_CONFIRMATION 0x27
37 #define X25_RR 0x01
38 #define X25_RNR 0x05
39 #define X25_REJ 0x09
40 #define X25_RESET_REQUEST 0x1B
41 #define X25_RESET_CONFIRMATION 0x1F
42 #define X25_REGISTRATION_REQUEST 0xF3
43 #define X25_REGISTRATION_CONFIRMATION 0xF7
44 #define X25_RESTART_REQUEST 0xFB
45 #define X25_RESTART_CONFIRMATION 0xFF
46 #define X25_DIAGNOSTIC 0xF1
47 #define X25_ILLEGAL 0xFD
48
49 /* Define the various conditions that may exist */
50
51 #define X25_COND_ACK_PENDING 0x01
52 #define X25_COND_OWN_RX_BUSY 0x02
53 #define X25_COND_PEER_RX_BUSY 0x04
54
55 /* Define Link State constants. */
56 enum {
57 X25_STATE_0, /* Ready */
58 X25_STATE_1, /* Awaiting Call Accepted */
59 X25_STATE_2, /* Awaiting Clear Confirmation */
60 X25_STATE_3, /* Data Transfer */
61 X25_STATE_4 /* Awaiting Reset Confirmation */
62 };
63
64 enum {
65 X25_LINK_STATE_0,
66 X25_LINK_STATE_1,
67 X25_LINK_STATE_2,
68 X25_LINK_STATE_3
69 };
70
71 #define X25_DEFAULT_T20 (180 * HZ) /* Default T20 value */
72 #define X25_DEFAULT_T21 (200 * HZ) /* Default T21 value */
73 #define X25_DEFAULT_T22 (180 * HZ) /* Default T22 value */
74 #define X25_DEFAULT_T23 (180 * HZ) /* Default T23 value */
75 #define X25_DEFAULT_T2 (3 * HZ) /* Default ack holdback value */
76
77 #define X25_DEFAULT_WINDOW_SIZE 2 /* Default Window Size */
78 #define X25_DEFAULT_PACKET_SIZE X25_PS128 /* Default Packet Size */
79 #define X25_DEFAULT_THROUGHPUT 0x0A /* Deafult Throughput */
80 #define X25_DEFAULT_REVERSE 0x00 /* Default Reverse Charging */
81
82 #define X25_SMODULUS 8
83 #define X25_EMODULUS 128
84
85 /*
86 * X.25 Facilities constants.
87 */
88
89 #define X25_FAC_CLASS_MASK 0xC0
90
91 #define X25_FAC_CLASS_A 0x00
92 #define X25_FAC_CLASS_B 0x40
93 #define X25_FAC_CLASS_C 0x80
94 #define X25_FAC_CLASS_D 0xC0
95
96 #define X25_FAC_REVERSE 0x01
97 #define X25_FAC_THROUGHPUT 0x02
98 #define X25_FAC_PACKET_SIZE 0x42
99 #define X25_FAC_WINDOW_SIZE 0x43
100
101 #define X25_MAX_FAC_LEN 20 /* Plenty to spare */
102 #define X25_MAX_CUD_LEN 128
103
104 struct x25_route {
105 struct x25_route *next;
106 x25_address address; /* Start of address range */
107 unsigned int sigdigits; /* Number of sig digits */
108 struct net_device *dev; /* More than one for MLP */
109 };
110
111 struct x25_neigh {
112 struct x25_neigh *next;
113 struct net_device *dev;
114 unsigned int state;
115 unsigned int extended;
116 struct sk_buff_head queue;
117 unsigned long t20;
118 struct timer_list t20timer;
119 unsigned long global_facil_mask;
120 };
121
122 typedef struct {
123 x25_address source_addr, dest_addr;
124 struct x25_neigh *neighbour;
125 unsigned int lci;
126 unsigned char state, condition, qbitincl, intflag;
127 unsigned short vs, vr, va, vl;
128 unsigned long t2, t21, t22, t23;
129 unsigned short fraglen;
130 struct sk_buff_head ack_queue;
131 struct sk_buff_head fragment_queue;
132 struct sk_buff_head interrupt_in_queue;
133 struct sk_buff_head interrupt_out_queue;
134 struct sock *sk; /* Backlink to socket */
135 struct timer_list timer;
136 struct x25_causediag causediag;
137 struct x25_facilities facilities;
138 struct x25_calluserdata calluserdata;
139 unsigned long vc_facil_mask; /* inc_call facilities mask */
140 } x25_cb;
141
142 /* af_x25.c */
143 extern int sysctl_x25_restart_request_timeout;
144 extern int sysctl_x25_call_request_timeout;
145 extern int sysctl_x25_reset_request_timeout;
146 extern int sysctl_x25_clear_request_timeout;
147 extern int sysctl_x25_ack_holdback_timeout;
148
149 extern int x25_addr_ntoa(unsigned char *, x25_address *, x25_address *);
150 extern int x25_addr_aton(unsigned char *, x25_address *, x25_address *);
151 extern unsigned int x25_new_lci(struct x25_neigh *);
152 extern struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
153 extern void x25_destroy_socket(struct sock *);
154 extern int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
155 extern void x25_kill_by_neigh(struct x25_neigh *);
156
157 /* x25_dev.c */
158 extern void x25_send_frame(struct sk_buff *, struct x25_neigh *);
159 extern int x25_lapb_receive_frame(struct sk_buff *, struct net_device *, struct packet_type *);
160 extern int x25_llc_receive_frame(struct sk_buff *, struct net_device *, struct packet_type *);
161 extern void x25_establish_link(struct x25_neigh *);
162 extern void x25_terminate_link(struct x25_neigh *);
163
164 /* x25_facilities.c */
165 extern int x25_parse_facilities(struct sk_buff *, struct x25_facilities *, unsigned long *);
166 extern int x25_create_facilities(unsigned char *, struct x25_facilities *, unsigned long);
167 extern int x25_negotiate_facilities(struct sk_buff *, struct sock *, struct x25_facilities *);
168 extern void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);
169
170 /* x25_in.c */
171 extern int x25_process_rx_frame(struct sock *, struct sk_buff *);
172 extern int x25_backlog_rcv(struct sock *, struct sk_buff *);
173
174 /* x25_link.c */
175 extern void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
176 extern void x25_link_device_up(struct net_device *);
177 extern void x25_link_device_down(struct net_device *);
178 extern void x25_link_established(struct x25_neigh *);
179 extern void x25_link_terminated(struct x25_neigh *);
180 extern void x25_transmit_restart_request(struct x25_neigh *);
181 extern void x25_transmit_restart_confirmation(struct x25_neigh *);
182 extern void x25_transmit_diagnostic(struct x25_neigh *, unsigned char);
183 extern void x25_transmit_clear_request(struct x25_neigh *, unsigned int, unsigned char);
184 extern void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
185 extern int x25_subscr_ioctl(unsigned int, void *);
186 extern struct x25_neigh *x25_get_neigh(struct net_device *);
187 extern void x25_link_free(void);
188
189 /* x25_out.c */
190 extern int x25_output(struct sock *, struct sk_buff *);
191 extern void x25_kick(struct sock *);
192 extern void x25_enquiry_response(struct sock *);
193
194 /* x25_route.c */
195 extern struct net_device *x25_get_route(x25_address *);
196 extern struct net_device *x25_dev_get(char *);
197 extern void x25_route_device_down(struct net_device *);
198 extern int x25_route_ioctl(unsigned int, void *);
199 extern int x25_routes_get_info(char *, char **, off_t, int);
200 extern void x25_route_free(void);
201
202 /* x25_subr.c */
203 extern void x25_clear_queues(struct sock *);
204 extern void x25_frames_acked(struct sock *, unsigned short);
205 extern void x25_requeue_frames(struct sock *);
206 extern int x25_validate_nr(struct sock *, unsigned short);
207 extern void x25_write_internal(struct sock *, int);
208 extern int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *, int *);
209 extern void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
210
211 /* x25_timer.c */
212 extern void x25_start_heartbeat(struct sock *);
213 extern void x25_start_t2timer(struct sock *);
214 extern void x25_start_t21timer(struct sock *);
215 extern void x25_start_t22timer(struct sock *);
216 extern void x25_start_t23timer(struct sock *);
217 extern void x25_stop_heartbeat(struct sock *);
218 extern void x25_stop_timer(struct sock *);
219 extern unsigned long x25_display_timer(struct sock *);
220
221 /* sysctl_net_x25.c */
222 extern void x25_register_sysctl(void);
223 extern void x25_unregister_sysctl(void);
224 struct x25_skb_cb {
225 unsigned flags;
226 };
227 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))
228 #endif
229
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