• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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