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Linux/include/net/x25.h

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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. */
 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         X25_STATE_5             /* Call Accepted / Call Connected pending */
 67 };
 68 
 69 enum {
 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                    /* Deafult 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  */
130 struct 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 
138 struct 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 
150 struct 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 
172 struct 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 static inline struct x25_sock *x25_sk(const struct sock *sk)
181 {
182         return (struct x25_sock *)sk;
183 }
184 
185 /* af_x25.c */
186 extern int  sysctl_x25_restart_request_timeout;
187 extern int  sysctl_x25_call_request_timeout;
188 extern int  sysctl_x25_reset_request_timeout;
189 extern int  sysctl_x25_clear_request_timeout;
190 extern int  sysctl_x25_ack_holdback_timeout;
191 extern int  sysctl_x25_forward;
192 
193 int x25_parse_address_block(struct sk_buff *skb,
194                             struct x25_address *called_addr,
195                             struct x25_address *calling_addr);
196 
197 int x25_addr_ntoa(unsigned char *, struct x25_address *, struct x25_address *);
198 int x25_addr_aton(unsigned char *, struct x25_address *, struct x25_address *);
199 struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
200 void x25_destroy_socket_from_timer(struct sock *);
201 int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
202 void x25_kill_by_neigh(struct x25_neigh *);
203 
204 /* x25_dev.c */
205 void x25_send_frame(struct sk_buff *, struct x25_neigh *);
206 int x25_lapb_receive_frame(struct sk_buff *, struct net_device *,
207                            struct packet_type *, struct net_device *);
208 void x25_establish_link(struct x25_neigh *);
209 void x25_terminate_link(struct x25_neigh *);
210 
211 /* x25_facilities.c */
212 int x25_parse_facilities(struct sk_buff *, struct x25_facilities *,
213                          struct x25_dte_facilities *, unsigned long *);
214 int x25_create_facilities(unsigned char *, struct x25_facilities *,
215                           struct x25_dte_facilities *, unsigned long);
216 int x25_negotiate_facilities(struct sk_buff *, struct sock *,
217                              struct x25_facilities *,
218                              struct x25_dte_facilities *);
219 void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);
220 
221 /* x25_forward.c */
222 void x25_clear_forward_by_lci(unsigned int lci);
223 void x25_clear_forward_by_dev(struct net_device *);
224 int x25_forward_data(int, struct x25_neigh *, struct sk_buff *);
225 int x25_forward_call(struct x25_address *, struct x25_neigh *, struct sk_buff *,
226                      int);
227 
228 /* x25_in.c */
229 int x25_process_rx_frame(struct sock *, struct sk_buff *);
230 int x25_backlog_rcv(struct sock *, struct sk_buff *);
231 
232 /* x25_link.c */
233 void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
234 void x25_link_device_up(struct net_device *);
235 void x25_link_device_down(struct net_device *);
236 void x25_link_established(struct x25_neigh *);
237 void x25_link_terminated(struct x25_neigh *);
238 void x25_transmit_clear_request(struct x25_neigh *, unsigned int,
239                                 unsigned char);
240 void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
241 int x25_subscr_ioctl(unsigned int, void __user *);
242 struct x25_neigh *x25_get_neigh(struct net_device *);
243 void x25_link_free(void);
244 
245 /* x25_neigh.c */
246 static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
247 {
248         refcount_inc(&nb->refcnt);
249 }
250 
251 static __inline__ void x25_neigh_put(struct x25_neigh *nb)
252 {
253         if (refcount_dec_and_test(&nb->refcnt))
254                 kfree(nb);
255 }
256 
257 /* x25_out.c */
258 int x25_output(struct sock *, struct sk_buff *);
259 void x25_kick(struct sock *);
260 void x25_enquiry_response(struct sock *);
261 
262 /* x25_route.c */
263 struct x25_route *x25_get_route(struct x25_address *addr);
264 struct net_device *x25_dev_get(char *);
265 void x25_route_device_down(struct net_device *dev);
266 int x25_route_ioctl(unsigned int, void __user *);
267 void x25_route_free(void);
268 
269 static __inline__ void x25_route_hold(struct x25_route *rt)
270 {
271         refcount_inc(&rt->refcnt);
272 }
273 
274 static __inline__ void x25_route_put(struct x25_route *rt)
275 {
276         if (refcount_dec_and_test(&rt->refcnt))
277                 kfree(rt);
278 }
279 
280 /* x25_subr.c */
281 void x25_clear_queues(struct sock *);
282 void x25_frames_acked(struct sock *, unsigned short);
283 void x25_requeue_frames(struct sock *);
284 int x25_validate_nr(struct sock *, unsigned short);
285 void x25_write_internal(struct sock *, int);
286 int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *,
287                int *);
288 void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
289 
290 /* x25_timer.c */
291 void x25_init_timers(struct sock *sk);
292 void x25_start_heartbeat(struct sock *);
293 void x25_start_t2timer(struct sock *);
294 void x25_start_t21timer(struct sock *);
295 void x25_start_t22timer(struct sock *);
296 void x25_start_t23timer(struct sock *);
297 void x25_stop_heartbeat(struct sock *);
298 void x25_stop_timer(struct sock *);
299 unsigned long x25_display_timer(struct sock *);
300 void x25_check_rbuf(struct sock *);
301 
302 /* sysctl_net_x25.c */
303 #ifdef CONFIG_SYSCTL
304 int x25_register_sysctl(void);
305 void x25_unregister_sysctl(void);
306 #else
307 static inline int x25_register_sysctl(void) { return 0; };
308 static inline void x25_unregister_sysctl(void) {};
309 #endif /* CONFIG_SYSCTL */
310 
311 struct x25_skb_cb {
312         unsigned int flags;
313 };
314 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))
315 
316 extern struct hlist_head x25_list;
317 extern rwlock_t x25_list_lock;
318 extern struct list_head x25_route_list;
319 extern rwlock_t x25_route_list_lock;
320 extern struct list_head x25_forward_list;
321 extern rwlock_t x25_forward_list_lock;
322 extern struct list_head x25_neigh_list;
323 extern rwlock_t x25_neigh_list_lock;
324 
325 int x25_proc_init(void);
326 void x25_proc_exit(void);
327 #endif
328 

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