xref: /openbmc/linux/include/net/x25.h (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
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 <net/sock.h>
14 
15 #define	X25_ADDR_LEN			16
16 
17 #define	X25_MAX_L2_LEN			18	/* 802.2 LLC */
18 
19 #define	X25_STD_MIN_LEN			3
20 #define	X25_EXT_MIN_LEN			4
21 
22 #define	X25_GFI_SEQ_MASK		0x30
23 #define	X25_GFI_STDSEQ			0x10
24 #define	X25_GFI_EXTSEQ			0x20
25 
26 #define	X25_Q_BIT			0x80
27 #define	X25_D_BIT			0x40
28 #define	X25_STD_M_BIT			0x10
29 #define	X25_EXT_M_BIT			0x01
30 
31 #define	X25_CALL_REQUEST		0x0B
32 #define	X25_CALL_ACCEPTED		0x0F
33 #define	X25_CLEAR_REQUEST		0x13
34 #define	X25_CLEAR_CONFIRMATION		0x17
35 #define	X25_DATA			0x00
36 #define	X25_INTERRUPT			0x23
37 #define	X25_INTERRUPT_CONFIRMATION	0x27
38 #define	X25_RR				0x01
39 #define	X25_RNR				0x05
40 #define	X25_REJ				0x09
41 #define	X25_RESET_REQUEST		0x1B
42 #define	X25_RESET_CONFIRMATION		0x1F
43 #define	X25_REGISTRATION_REQUEST	0xF3
44 #define	X25_REGISTRATION_CONFIRMATION	0xF7
45 #define	X25_RESTART_REQUEST		0xFB
46 #define	X25_RESTART_CONFIRMATION	0xFF
47 #define	X25_DIAGNOSTIC			0xF1
48 #define	X25_ILLEGAL			0xFD
49 
50 /* Define the various conditions that may exist */
51 
52 #define	X25_COND_ACK_PENDING	0x01
53 #define	X25_COND_OWN_RX_BUSY	0x02
54 #define	X25_COND_PEER_RX_BUSY	0x04
55 
56 /* Define Link State constants. */
57 enum {
58 	X25_STATE_0,		/* Ready */
59 	X25_STATE_1,		/* Awaiting Call Accepted */
60 	X25_STATE_2,		/* Awaiting Clear Confirmation */
61 	X25_STATE_3,		/* Data Transfer */
62 	X25_STATE_4		/* Awaiting Reset Confirmation */
63 };
64 
65 enum {
66 	X25_LINK_STATE_0,
67 	X25_LINK_STATE_1,
68 	X25_LINK_STATE_2,
69 	X25_LINK_STATE_3
70 };
71 
72 #define X25_DEFAULT_T20		(180 * HZ)		/* Default T20 value */
73 #define X25_DEFAULT_T21		(200 * HZ)		/* Default T21 value */
74 #define X25_DEFAULT_T22		(180 * HZ)		/* Default T22 value */
75 #define	X25_DEFAULT_T23		(180 * HZ)		/* Default T23 value */
76 #define	X25_DEFAULT_T2		(3   * HZ)		/* Default ack holdback value */
77 
78 #define	X25_DEFAULT_WINDOW_SIZE	2			/* Default Window Size	*/
79 #define	X25_DEFAULT_PACKET_SIZE	X25_PS128		/* Default Packet Size */
80 #define	X25_DEFAULT_THROUGHPUT	0x0A			/* Deafult Throughput */
81 #define	X25_DEFAULT_REVERSE	0x00			/* Default Reverse Charging */
82 #define X25_DENY_ACCPT_APPRV   0x01			/* Default value */
83 #define X25_ALLOW_ACCPT_APPRV  0x00			/* Control enabled */
84 
85 #define X25_SMODULUS 		8
86 #define	X25_EMODULUS		128
87 
88 /*
89  *	X.25 Facilities constants.
90  */
91 
92 #define	X25_FAC_CLASS_MASK	0xC0
93 
94 #define	X25_FAC_CLASS_A		0x00
95 #define	X25_FAC_CLASS_B		0x40
96 #define	X25_FAC_CLASS_C		0x80
97 #define	X25_FAC_CLASS_D		0xC0
98 
99 #define	X25_FAC_REVERSE		0x01			/* also fast select */
100 #define	X25_FAC_THROUGHPUT	0x02
101 #define	X25_FAC_PACKET_SIZE	0x42
102 #define	X25_FAC_WINDOW_SIZE	0x43
103 
104 #define	X25_MAX_FAC_LEN		20		/* Plenty to spare */
105 #define	X25_MAX_CUD_LEN		128
106 
107 /**
108  *	struct x25_route - x25 routing entry
109  *	@node - entry in x25_list_lock
110  *	@address - Start of address range
111  *	@sigdigits - Number of sig digits
112  *	@dev - More than one for MLP
113  *	@refcnt - reference counter
114  */
115 struct x25_route {
116 	struct list_head	node;
117 	struct x25_address	address;
118 	unsigned int		sigdigits;
119 	struct net_device	*dev;
120 	atomic_t		refcnt;
121 };
122 
123 struct x25_neigh {
124 	struct list_head	node;
125 	struct net_device	*dev;
126 	unsigned int		state;
127 	unsigned int		extended;
128 	struct sk_buff_head	queue;
129 	unsigned long		t20;
130 	struct timer_list	t20timer;
131 	unsigned long		global_facil_mask;
132 	atomic_t		refcnt;
133 };
134 
135 struct x25_sock {
136 	struct sock		sk;
137 	struct x25_address	source_addr, dest_addr;
138 	struct x25_neigh	*neighbour;
139 	unsigned int		lci, cudmatchlength;
140 	unsigned char		state, condition, qbitincl, intflag, accptapprv;
141 	unsigned short		vs, vr, va, vl;
142 	unsigned long		t2, t21, t22, t23;
143 	unsigned short		fraglen;
144 	struct sk_buff_head	ack_queue;
145 	struct sk_buff_head	fragment_queue;
146 	struct sk_buff_head	interrupt_in_queue;
147 	struct sk_buff_head	interrupt_out_queue;
148 	struct timer_list	timer;
149 	struct x25_causediag	causediag;
150 	struct x25_facilities	facilities;
151 	struct x25_calluserdata	calluserdata;
152 	unsigned long 		vc_facil_mask;	/* inc_call facilities mask */
153 };
154 
155 static inline struct x25_sock *x25_sk(const struct sock *sk)
156 {
157 	return (struct x25_sock *)sk;
158 }
159 
160 /* af_x25.c */
161 extern int  sysctl_x25_restart_request_timeout;
162 extern int  sysctl_x25_call_request_timeout;
163 extern int  sysctl_x25_reset_request_timeout;
164 extern int  sysctl_x25_clear_request_timeout;
165 extern int  sysctl_x25_ack_holdback_timeout;
166 
167 extern int  x25_addr_ntoa(unsigned char *, struct x25_address *,
168 			  struct x25_address *);
169 extern int  x25_addr_aton(unsigned char *, struct x25_address *,
170 			  struct x25_address *);
171 extern struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
172 extern void x25_destroy_socket(struct sock *);
173 extern int  x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
174 extern void x25_kill_by_neigh(struct x25_neigh *);
175 
176 /* x25_dev.c */
177 extern void x25_send_frame(struct sk_buff *, struct x25_neigh *);
178 extern int  x25_lapb_receive_frame(struct sk_buff *, struct net_device *, struct packet_type *, struct net_device *);
179 extern void x25_establish_link(struct x25_neigh *);
180 extern void x25_terminate_link(struct x25_neigh *);
181 
182 /* x25_facilities.c */
183 extern int  x25_parse_facilities(struct sk_buff *, struct x25_facilities *, unsigned long *);
184 extern int  x25_create_facilities(unsigned char *, struct x25_facilities *, unsigned long);
185 extern int  x25_negotiate_facilities(struct sk_buff *, struct sock *, struct x25_facilities *);
186 extern void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);
187 
188 /* x25_in.c */
189 extern int  x25_process_rx_frame(struct sock *, struct sk_buff *);
190 extern int  x25_backlog_rcv(struct sock *, struct sk_buff *);
191 
192 /* x25_link.c */
193 extern void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
194 extern void x25_link_device_up(struct net_device *);
195 extern void x25_link_device_down(struct net_device *);
196 extern void x25_link_established(struct x25_neigh *);
197 extern void x25_link_terminated(struct x25_neigh *);
198 extern void x25_transmit_clear_request(struct x25_neigh *, unsigned int, unsigned char);
199 extern void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
200 extern int  x25_subscr_ioctl(unsigned int, void __user *);
201 extern struct x25_neigh *x25_get_neigh(struct net_device *);
202 extern void x25_link_free(void);
203 
204 /* x25_neigh.c */
205 static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
206 {
207 	atomic_inc(&nb->refcnt);
208 }
209 
210 static __inline__ void x25_neigh_put(struct x25_neigh *nb)
211 {
212 	if (atomic_dec_and_test(&nb->refcnt))
213 		kfree(nb);
214 }
215 
216 /* x25_out.c */
217 extern  int x25_output(struct sock *, struct sk_buff *);
218 extern void x25_kick(struct sock *);
219 extern void x25_enquiry_response(struct sock *);
220 
221 /* x25_route.c */
222 extern struct x25_route *x25_get_route(struct x25_address *addr);
223 extern struct net_device *x25_dev_get(char *);
224 extern void x25_route_device_down(struct net_device *dev);
225 extern int  x25_route_ioctl(unsigned int, void __user *);
226 extern void x25_route_free(void);
227 
228 static __inline__ void x25_route_hold(struct x25_route *rt)
229 {
230 	atomic_inc(&rt->refcnt);
231 }
232 
233 static __inline__ void x25_route_put(struct x25_route *rt)
234 {
235 	if (atomic_dec_and_test(&rt->refcnt))
236 		kfree(rt);
237 }
238 
239 /* x25_subr.c */
240 extern void x25_clear_queues(struct sock *);
241 extern void x25_frames_acked(struct sock *, unsigned short);
242 extern void x25_requeue_frames(struct sock *);
243 extern int  x25_validate_nr(struct sock *, unsigned short);
244 extern void x25_write_internal(struct sock *, int);
245 extern int  x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *, int *);
246 extern void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
247 
248 /* x25_timer.c */
249 extern void x25_start_heartbeat(struct sock *);
250 extern void x25_start_t2timer(struct sock *);
251 extern void x25_start_t21timer(struct sock *);
252 extern void x25_start_t22timer(struct sock *);
253 extern void x25_start_t23timer(struct sock *);
254 extern void x25_stop_heartbeat(struct sock *);
255 extern void x25_stop_timer(struct sock *);
256 extern unsigned long x25_display_timer(struct sock *);
257 extern void x25_check_rbuf(struct sock *);
258 
259 /* sysctl_net_x25.c */
260 extern void x25_register_sysctl(void);
261 extern void x25_unregister_sysctl(void);
262 struct x25_skb_cb {
263 	unsigned flags;
264 };
265 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))
266 
267 extern struct hlist_head x25_list;
268 extern rwlock_t x25_list_lock;
269 extern struct list_head x25_route_list;
270 extern rwlock_t x25_route_list_lock;
271 
272 extern int x25_proc_init(void);
273 extern void x25_proc_exit(void);
274 #endif
275