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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 };
 67 
 68 enum {
 69         X25_LINK_STATE_0,
 70         X25_LINK_STATE_1,
 71         X25_LINK_STATE_2,
 72         X25_LINK_STATE_3
 73 };
 74 
 75 #define X25_DEFAULT_T20         (180 * HZ)              /* Default T20 value */
 76 #define X25_DEFAULT_T21         (200 * HZ)              /* Default T21 value */
 77 #define X25_DEFAULT_T22         (180 * HZ)              /* Default T22 value */
 78 #define X25_DEFAULT_T23         (180 * HZ)              /* Default T23 value */
 79 #define X25_DEFAULT_T2          (3   * HZ)              /* Default ack holdback value */
 80 
 81 #define X25_DEFAULT_WINDOW_SIZE 2                       /* Default Window Size  */
 82 #define X25_DEFAULT_PACKET_SIZE X25_PS128               /* Default Packet Size */
 83 #define X25_DEFAULT_THROUGHPUT  0x0A                    /* Deafult Throughput */
 84 #define X25_DEFAULT_REVERSE     0x00                    /* Default Reverse Charging */
 85 
 86 #define X25_SMODULUS            8
 87 #define X25_EMODULUS            128
 88 
 89 /*
 90  *      X.25 Facilities constants.
 91  */
 92 
 93 #define X25_FAC_CLASS_MASK      0xC0
 94 
 95 #define X25_FAC_CLASS_A         0x00
 96 #define X25_FAC_CLASS_B         0x40
 97 #define X25_FAC_CLASS_C         0x80
 98 #define X25_FAC_CLASS_D         0xC0
 99 
100 #define X25_FAC_REVERSE         0x01                    /* also fast select */
101 #define X25_FAC_THROUGHPUT      0x02
102 #define X25_FAC_PACKET_SIZE     0x42
103 #define X25_FAC_WINDOW_SIZE     0x43
104 
105 #define X25_MAX_FAC_LEN         60
106 #define X25_MAX_CUD_LEN         128
107 
108 #define X25_FAC_CALLING_AE      0xCB
109 #define X25_FAC_CALLED_AE       0xC9
110 
111 #define X25_MARKER              0x00
112 #define X25_DTE_SERVICES        0x0F
113 #define X25_MAX_AE_LEN          40                      /* Max num of semi-octets in AE - OSI Nw */
114 #define X25_MAX_DTE_FACIL_LEN   21                      /* Max length of DTE facility params */
115 
116 /* Bitset in x25_sock->flags for misc flags */
117 #define X25_Q_BIT_FLAG          0
118 #define X25_INTERRUPT_FLAG      1
119 #define X25_ACCPT_APPRV_FLAG    2
120 
121 /**
122  *      struct x25_route - x25 routing entry
123  *      @node - entry in x25_list_lock
124  *      @address - Start of address range
125  *      @sigdigits - Number of sig digits
126  *      @dev - More than one for MLP
127  *      @refcnt - reference counter
128  */
129 struct x25_route {
130         struct list_head        node;           
131         struct x25_address      address;
132         unsigned int            sigdigits;
133         struct net_device       *dev;
134         refcount_t              refcnt;
135 };
136 
137 struct x25_neigh {
138         struct list_head        node;
139         struct net_device       *dev;
140         unsigned int            state;
141         unsigned int            extended;
142         struct sk_buff_head     queue;
143         unsigned long           t20;
144         struct timer_list       t20timer;
145         unsigned long           global_facil_mask;
146         refcount_t              refcnt;
147 };
148 
149 struct x25_sock {
150         struct sock             sk;
151         struct x25_address      source_addr, dest_addr;
152         struct x25_neigh        *neighbour;
153         unsigned int            lci, cudmatchlength;
154         unsigned char           state, condition;
155         unsigned short          vs, vr, va, vl;
156         unsigned long           t2, t21, t22, t23;
157         unsigned short          fraglen;
158         unsigned long           flags;
159         struct sk_buff_head     ack_queue;
160         struct sk_buff_head     fragment_queue;
161         struct sk_buff_head     interrupt_in_queue;
162         struct sk_buff_head     interrupt_out_queue;
163         struct timer_list       timer;
164         struct x25_causediag    causediag;
165         struct x25_facilities   facilities;
166         struct x25_dte_facilities dte_facilities;
167         struct x25_calluserdata calluserdata;
168         unsigned long           vc_facil_mask;  /* inc_call facilities mask */
169 };
170 
171 struct x25_forward {
172         struct list_head        node;
173         unsigned int            lci;
174         struct net_device       *dev1;
175         struct net_device       *dev2;
176         atomic_t                refcnt;
177 };
178 
179 static inline struct x25_sock *x25_sk(const struct sock *sk)
180 {
181         return (struct x25_sock *)sk;
182 }
183 
184 /* af_x25.c */
185 extern int  sysctl_x25_restart_request_timeout;
186 extern int  sysctl_x25_call_request_timeout;
187 extern int  sysctl_x25_reset_request_timeout;
188 extern int  sysctl_x25_clear_request_timeout;
189 extern int  sysctl_x25_ack_holdback_timeout;
190 extern int  sysctl_x25_forward;
191 
192 int x25_parse_address_block(struct sk_buff *skb,
193                             struct x25_address *called_addr,
194                             struct x25_address *calling_addr);
195 
196 int x25_addr_ntoa(unsigned char *, struct x25_address *, struct x25_address *);
197 int x25_addr_aton(unsigned char *, struct x25_address *, struct x25_address *);
198 struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
199 void x25_destroy_socket_from_timer(struct sock *);
200 int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
201 void x25_kill_by_neigh(struct x25_neigh *);
202 
203 /* x25_dev.c */
204 void x25_send_frame(struct sk_buff *, struct x25_neigh *);
205 int x25_lapb_receive_frame(struct sk_buff *, struct net_device *,
206                            struct packet_type *, struct net_device *);
207 void x25_establish_link(struct x25_neigh *);
208 void x25_terminate_link(struct x25_neigh *);
209 
210 /* x25_facilities.c */
211 int x25_parse_facilities(struct sk_buff *, struct x25_facilities *,
212                          struct x25_dte_facilities *, unsigned long *);
213 int x25_create_facilities(unsigned char *, struct x25_facilities *,
214                           struct x25_dte_facilities *, unsigned long);
215 int x25_negotiate_facilities(struct sk_buff *, struct sock *,
216                              struct x25_facilities *,
217                              struct x25_dte_facilities *);
218 void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);
219 
220 /* x25_forward.c */
221 void x25_clear_forward_by_lci(unsigned int lci);
222 void x25_clear_forward_by_dev(struct net_device *);
223 int x25_forward_data(int, struct x25_neigh *, struct sk_buff *);
224 int x25_forward_call(struct x25_address *, struct x25_neigh *, struct sk_buff *,
225                      int);
226 
227 /* x25_in.c */
228 int x25_process_rx_frame(struct sock *, struct sk_buff *);
229 int x25_backlog_rcv(struct sock *, struct sk_buff *);
230 
231 /* x25_link.c */
232 void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
233 void x25_link_device_up(struct net_device *);
234 void x25_link_device_down(struct net_device *);
235 void x25_link_established(struct x25_neigh *);
236 void x25_link_terminated(struct x25_neigh *);
237 void x25_transmit_clear_request(struct x25_neigh *, unsigned int,
238                                 unsigned char);
239 void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
240 int x25_subscr_ioctl(unsigned int, void __user *);
241 struct x25_neigh *x25_get_neigh(struct net_device *);
242 void x25_link_free(void);
243 
244 /* x25_neigh.c */
245 static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
246 {
247         refcount_inc(&nb->refcnt);
248 }
249 
250 static __inline__ void x25_neigh_put(struct x25_neigh *nb)
251 {
252         if (refcount_dec_and_test(&nb->refcnt))
253                 kfree(nb);
254 }
255 
256 /* x25_out.c */
257 int x25_output(struct sock *, struct sk_buff *);
258 void x25_kick(struct sock *);
259 void x25_enquiry_response(struct sock *);
260 
261 /* x25_route.c */
262 struct x25_route *x25_get_route(struct x25_address *addr);
263 struct net_device *x25_dev_get(char *);
264 void x25_route_device_down(struct net_device *dev);
265 int x25_route_ioctl(unsigned int, void __user *);
266 void x25_route_free(void);
267 
268 static __inline__ void x25_route_hold(struct x25_route *rt)
269 {
270         refcount_inc(&rt->refcnt);
271 }
272 
273 static __inline__ void x25_route_put(struct x25_route *rt)
274 {
275         if (refcount_dec_and_test(&rt->refcnt))
276                 kfree(rt);
277 }
278 
279 /* x25_subr.c */
280 void x25_clear_queues(struct sock *);
281 void x25_frames_acked(struct sock *, unsigned short);
282 void x25_requeue_frames(struct sock *);
283 int x25_validate_nr(struct sock *, unsigned short);
284 void x25_write_internal(struct sock *, int);
285 int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *,
286                int *);
287 void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
288 
289 /* x25_timer.c */
290 void x25_init_timers(struct sock *sk);
291 void x25_start_heartbeat(struct sock *);
292 void x25_start_t2timer(struct sock *);
293 void x25_start_t21timer(struct sock *);
294 void x25_start_t22timer(struct sock *);
295 void x25_start_t23timer(struct sock *);
296 void x25_stop_heartbeat(struct sock *);
297 void x25_stop_timer(struct sock *);
298 unsigned long x25_display_timer(struct sock *);
299 void x25_check_rbuf(struct sock *);
300 
301 /* sysctl_net_x25.c */
302 #ifdef CONFIG_SYSCTL
303 int x25_register_sysctl(void);
304 void x25_unregister_sysctl(void);
305 #else
306 static inline int x25_register_sysctl(void) { return 0; };
307 static inline void x25_unregister_sysctl(void) {};
308 #endif /* CONFIG_SYSCTL */
309 
310 struct x25_skb_cb {
311         unsigned int flags;
312 };
313 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))
314 
315 extern struct hlist_head x25_list;
316 extern rwlock_t x25_list_lock;
317 extern struct list_head x25_route_list;
318 extern rwlock_t x25_route_list_lock;
319 extern struct list_head x25_forward_list;
320 extern rwlock_t x25_forward_list_lock;
321 extern struct list_head x25_neigh_list;
322 extern rwlock_t x25_neigh_list_lock;
323 
324 int x25_proc_init(void);
325 void x25_proc_exit(void);
326 #endif
327 

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