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Linux/include/net/x25.h

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  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 
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 int x25_parse_address_block(struct sk_buff *skb,
191                             struct x25_address *called_addr,
192                             struct x25_address *calling_addr);
193 
194 int x25_addr_ntoa(unsigned char *, struct x25_address *, struct x25_address *);
195 int x25_addr_aton(unsigned char *, struct x25_address *, struct x25_address *);
196 struct sock *x25_find_socket(unsigned int, struct x25_neigh *);
197 void x25_destroy_socket_from_timer(struct sock *);
198 int x25_rx_call_request(struct sk_buff *, struct x25_neigh *, unsigned int);
199 void x25_kill_by_neigh(struct x25_neigh *);
200 
201 /* x25_dev.c */
202 void x25_send_frame(struct sk_buff *, struct x25_neigh *);
203 int x25_lapb_receive_frame(struct sk_buff *, struct net_device *,
204                            struct packet_type *, struct net_device *);
205 void x25_establish_link(struct x25_neigh *);
206 void x25_terminate_link(struct x25_neigh *);
207 
208 /* x25_facilities.c */
209 int x25_parse_facilities(struct sk_buff *, struct x25_facilities *,
210                          struct x25_dte_facilities *, unsigned long *);
211 int x25_create_facilities(unsigned char *, struct x25_facilities *,
212                           struct x25_dte_facilities *, unsigned long);
213 int x25_negotiate_facilities(struct sk_buff *, struct sock *,
214                              struct x25_facilities *,
215                              struct x25_dte_facilities *);
216 void x25_limit_facilities(struct x25_facilities *, struct x25_neigh *);
217 
218 /* x25_forward.c */
219 void x25_clear_forward_by_lci(unsigned int lci);
220 void x25_clear_forward_by_dev(struct net_device *);
221 int x25_forward_data(int, struct x25_neigh *, struct sk_buff *);
222 int x25_forward_call(struct x25_address *, struct x25_neigh *, struct sk_buff *,
223                      int);
224 
225 /* x25_in.c */
226 int x25_process_rx_frame(struct sock *, struct sk_buff *);
227 int x25_backlog_rcv(struct sock *, struct sk_buff *);
228 
229 /* x25_link.c */
230 void x25_link_control(struct sk_buff *, struct x25_neigh *, unsigned short);
231 void x25_link_device_up(struct net_device *);
232 void x25_link_device_down(struct net_device *);
233 void x25_link_established(struct x25_neigh *);
234 void x25_link_terminated(struct x25_neigh *);
235 void x25_transmit_clear_request(struct x25_neigh *, unsigned int,
236                                 unsigned char);
237 void x25_transmit_link(struct sk_buff *, struct x25_neigh *);
238 int x25_subscr_ioctl(unsigned int, void __user *);
239 struct x25_neigh *x25_get_neigh(struct net_device *);
240 void x25_link_free(void);
241 
242 /* x25_neigh.c */
243 static __inline__ void x25_neigh_hold(struct x25_neigh *nb)
244 {
245         atomic_inc(&nb->refcnt);
246 }
247 
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 int x25_output(struct sock *, struct sk_buff *);
256 void x25_kick(struct sock *);
257 void x25_enquiry_response(struct sock *);
258 
259 /* x25_route.c */
260 struct x25_route *x25_get_route(struct x25_address *addr);
261 struct net_device *x25_dev_get(char *);
262 void x25_route_device_down(struct net_device *dev);
263 int x25_route_ioctl(unsigned int, void __user *);
264 void x25_route_free(void);
265 
266 static __inline__ void x25_route_hold(struct x25_route *rt)
267 {
268         atomic_inc(&rt->refcnt);
269 }
270 
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 void x25_clear_queues(struct sock *);
279 void x25_frames_acked(struct sock *, unsigned short);
280 void x25_requeue_frames(struct sock *);
281 int x25_validate_nr(struct sock *, unsigned short);
282 void x25_write_internal(struct sock *, int);
283 int x25_decode(struct sock *, struct sk_buff *, int *, int *, int *, int *,
284                int *);
285 void x25_disconnect(struct sock *, int, unsigned char, unsigned char);
286 
287 /* x25_timer.c */
288 void x25_init_timers(struct sock *sk);
289 void x25_start_heartbeat(struct sock *);
290 void x25_start_t2timer(struct sock *);
291 void x25_start_t21timer(struct sock *);
292 void x25_start_t22timer(struct sock *);
293 void x25_start_t23timer(struct sock *);
294 void x25_stop_heartbeat(struct sock *);
295 void x25_stop_timer(struct sock *);
296 unsigned long x25_display_timer(struct sock *);
297 void x25_check_rbuf(struct sock *);
298 
299 /* sysctl_net_x25.c */
300 #ifdef CONFIG_SYSCTL
301 void x25_register_sysctl(void);
302 void x25_unregister_sysctl(void);
303 #else
304 static inline void x25_register_sysctl(void) {};
305 static inline void x25_unregister_sysctl(void) {};
306 #endif /* CONFIG_SYSCTL */
307 
308 struct x25_skb_cb {
309         unsigned int flags;
310 };
311 #define X25_SKB_CB(s) ((struct x25_skb_cb *) ((s)->cb))
312 
313 extern struct hlist_head x25_list;
314 extern rwlock_t x25_list_lock;
315 extern struct list_head x25_route_list;
316 extern rwlock_t x25_route_list_lock;
317 extern struct list_head x25_forward_list;
318 extern rwlock_t x25_forward_list_lock;
319 extern struct list_head x25_neigh_list;
320 extern rwlock_t x25_neigh_list_lock;
321 
322 int x25_proc_init(void);
323 void x25_proc_exit(void);
324 #endif
325 

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