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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. */
60enum {
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
69enum {
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 /* Default 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 */
130struct 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
138struct 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
150struct 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
172struct 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
180#define x25_sk(ptr) container_of_const(ptr, struct x25_sock, sk)
181
182/* af_x25.c */
183extern int sysctl_x25_restart_request_timeout;
184extern int sysctl_x25_call_request_timeout;
185extern int sysctl_x25_reset_request_timeout;
186extern int sysctl_x25_clear_request_timeout;
187extern int sysctl_x25_ack_holdback_timeout;
188extern int sysctl_x25_forward;
189
190int x25_parse_address_block(struct sk_buff *skb,
191 struct x25_address *called_addr,
192 struct x25_address *calling_addr);
193
194int x25_addr_ntoa(unsigned char *, struct x25_address *, struct x25_address *);
195int x25_addr_aton(unsigned char *, struct x25_address *, struct x25_address *);
196struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
197void x25_destroy_socket_from_timer(struct sock *);
198int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
199void x25_kill_by_neigh(struct x25_neigh *);
200
201/* x25_dev.c */
202void x25_send_frame(struct sk_buff *, struct x25_neigh *);
203int x25_lapb_receive_frame(struct sk_buff *, struct net_device *,
204 struct packet_type *, struct net_device *);
205void x25_establish_link(struct x25_neigh *);
206
207/* x25_facilities.c */
208int x25_parse_facilities(struct sk_buff *, struct x25_facilities *,
209 struct x25_dte_facilities *, unsigned long *);
210int x25_create_facilities(unsigned char *, struct x25_facilities *,
211 struct x25_dte_facilities *, unsigned long);
212int x25_negotiate_facilities(struct sk_buff *, struct sock *,
213 struct x25_facilities *,
214 struct x25_dte_facilities *);
215void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);
216
217/* x25_forward.c */
218void x25_clear_forward_by_lci(unsigned int lci);
219void x25_clear_forward_by_dev(struct net_device *);
220int x25_forward_data(int, struct x25_neigh *, struct sk_buff *);
221int x25_forward_call(struct x25_address *, struct x25_neigh *, struct sk_buff *,
222 int);
223
224/* x25_in.c */
225int x25_process_rx_frame(struct sock *, struct sk_buff *);
226int x25_backlog_rcv(struct sock *, struct sk_buff *);
227
228/* x25_link.c */
229void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
230void x25_link_device_up(struct net_device *);
231void x25_link_device_down(struct net_device *);
232void x25_link_established(struct x25_neigh *);
233void x25_link_terminated(struct x25_neigh *);
234void x25_transmit_clear_request(struct x25_neigh *, unsigned int,
235 unsigned char);
236void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
237int x25_subscr_ioctl(unsigned int, void __user *);
238struct x25_neigh *x25_get_neigh(struct net_device *);
239void x25_link_free(void);
240
241/* x25_neigh.c */
242static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
243{
244 refcount_inc(&nb->refcnt);
245}
246
247static __inline__ void x25_neigh_put(struct x25_neigh *nb)
248{
249 if (refcount_dec_and_test(&nb->refcnt))
250 kfree(nb);
251}
252
253/* x25_out.c */
254int x25_output(struct sock *, struct sk_buff *);
255void x25_kick(struct sock *);
256void x25_enquiry_response(struct sock *);
257
258/* x25_route.c */
259struct x25_route *x25_get_route(struct x25_address *addr);
260struct net_device *x25_dev_get(char *);
261void x25_route_device_down(struct net_device *dev);
262int x25_route_ioctl(unsigned int, void __user *);
263void x25_route_free(void);
264
265static __inline__ void x25_route_hold(struct x25_route *rt)
266{
267 refcount_inc(&rt->refcnt);
268}
269
270static __inline__ void x25_route_put(struct x25_route *rt)
271{
272 if (refcount_dec_and_test(&rt->refcnt))
273 kfree(rt);
274}
275
276/* x25_subr.c */
277void x25_clear_queues(struct sock *);
278void x25_frames_acked(struct sock *, unsigned short);
279void x25_requeue_frames(struct sock *);
280int x25_validate_nr(struct sock *, unsigned short);
281void x25_write_internal(struct sock *, int);
282int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *,
283 int *);
284void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
285
286/* x25_timer.c */
287void x25_init_timers(struct sock *sk);
288void x25_start_heartbeat(struct sock *);
289void x25_start_t2timer(struct sock *);
290void x25_start_t21timer(struct sock *);
291void x25_start_t22timer(struct sock *);
292void x25_start_t23timer(struct sock *);
293void x25_stop_heartbeat(struct sock *);
294void x25_stop_timer(struct sock *);
295unsigned long x25_display_timer(struct sock *);
296void x25_check_rbuf(struct sock *);
297
298/* sysctl_net_x25.c */
299#ifdef CONFIG_SYSCTL
300int x25_register_sysctl(void);
301void x25_unregister_sysctl(void);
302#else
303static inline int x25_register_sysctl(void) { return 0; };
304static inline void x25_unregister_sysctl(void) {};
305#endif /* CONFIG_SYSCTL */
306
307struct x25_skb_cb {
308 unsigned int flags;
309};
310#define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))
311
312extern struct hlist_head x25_list;
313extern rwlock_t x25_list_lock;
314extern struct list_head x25_route_list;
315extern rwlock_t x25_route_list_lock;
316extern struct list_head x25_forward_list;
317extern rwlock_t x25_forward_list_lock;
318extern struct list_head x25_neigh_list;
319extern rwlock_t x25_neigh_list_lock;
320
321int x25_proc_init(void);
322void x25_proc_exit(void);
323#endif