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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 | /* * LAPB release 002 * * This code REQUIRES 2.1.15 or higher/ NET3.038 * * This module: * This module is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * History * LAPB 001 Jonathan Naylor Started Coding * LAPB 002 Jonathan Naylor New timer architecture. * 2000-10-29 Henner Eisen lapb_data_indication() return status. */ #include <linux/module.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/socket.h> #include <linux/in.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/timer.h> #include <linux/string.h> #include <linux/sockios.h> #include <linux/net.h> #include <linux/inet.h> #include <linux/if_arp.h> #include <linux/skbuff.h> #include <net/sock.h> #include <asm/uaccess.h> #include <asm/system.h> #include <linux/fcntl.h> #include <linux/mm.h> #include <linux/interrupt.h> #include <linux/stat.h> #include <linux/init.h> #include <net/lapb.h> static lapb_cb *volatile lapb_list /* = NULL initially */; /* * Free an allocated lapb control block. This is done to centralise * the MOD count code. */ static void lapb_free_cb(lapb_cb *lapb) { kfree(lapb); MOD_DEC_USE_COUNT; } /* * Socket removal during an interrupt is now safe. */ static void lapb_remove_cb(lapb_cb *lapb) { lapb_cb *s; unsigned long flags; save_flags(flags); cli(); if ((s = lapb_list) == lapb) { lapb_list = s->next; restore_flags(flags); return; } while (s != NULL && s->next != NULL) { if (s->next == lapb) { s->next = lapb->next; restore_flags(flags); return; } s = s->next; } restore_flags(flags); } /* * Add a socket to the bound sockets list. */ static void lapb_insert_cb(lapb_cb *lapb) { unsigned long flags; save_flags(flags); cli(); lapb->next = lapb_list; lapb_list = lapb; restore_flags(flags); } /* * Convert the integer token used by the device driver into a pointer * to a LAPB control structure. */ static lapb_cb *lapb_tokentostruct(void *token) { lapb_cb *lapb; for (lapb = lapb_list; lapb != NULL; lapb = lapb->next) if (lapb->token == token) return lapb; return NULL; } /* * Create an empty LAPB control block. */ static lapb_cb *lapb_create_cb(void) { lapb_cb *lapb; if ((lapb = kmalloc(sizeof(*lapb), GFP_ATOMIC)) == NULL) return NULL; MOD_INC_USE_COUNT; memset(lapb, 0x00, sizeof(*lapb)); skb_queue_head_init(&lapb->write_queue); skb_queue_head_init(&lapb->ack_queue); init_timer(&lapb->t1timer); init_timer(&lapb->t2timer); lapb->t1 = LAPB_DEFAULT_T1; lapb->t2 = LAPB_DEFAULT_T2; lapb->n2 = LAPB_DEFAULT_N2; lapb->mode = LAPB_DEFAULT_MODE; lapb->window = LAPB_DEFAULT_WINDOW; lapb->state = LAPB_STATE_0; return lapb; } int lapb_register(void *token, struct lapb_register_struct *callbacks) { lapb_cb *lapb; if (lapb_tokentostruct(token) != NULL) return LAPB_BADTOKEN; if ((lapb = lapb_create_cb()) == NULL) return LAPB_NOMEM; lapb->token = token; lapb->callbacks = *callbacks; lapb_insert_cb(lapb); lapb_start_t1timer(lapb); return LAPB_OK; } int lapb_unregister(void *token) { lapb_cb *lapb; if ((lapb = lapb_tokentostruct(token)) == NULL) return LAPB_BADTOKEN; lapb_stop_t1timer(lapb); lapb_stop_t2timer(lapb); lapb_clear_queues(lapb); lapb_remove_cb(lapb); lapb_free_cb(lapb); return LAPB_OK; } int lapb_getparms(void *token, struct lapb_parms_struct *parms) { lapb_cb *lapb; if ((lapb = lapb_tokentostruct(token)) == NULL) return LAPB_BADTOKEN; parms->t1 = lapb->t1 / HZ; parms->t2 = lapb->t2 / HZ; parms->n2 = lapb->n2; parms->n2count = lapb->n2count; parms->state = lapb->state; parms->window = lapb->window; parms->mode = lapb->mode; if (!timer_pending(&lapb->t1timer)) parms->t1timer = 0; else parms->t1timer = (lapb->t1timer.expires - jiffies) / HZ; if (!timer_pending(&lapb->t2timer)) parms->t2timer = 0; else parms->t2timer = (lapb->t2timer.expires - jiffies) / HZ; return LAPB_OK; } int lapb_setparms(void *token, struct lapb_parms_struct *parms) { lapb_cb *lapb; if ((lapb = lapb_tokentostruct(token)) == NULL) return LAPB_BADTOKEN; if (parms->t1 < 1) return LAPB_INVALUE; if (parms->t2 < 1) return LAPB_INVALUE; if (parms->n2 < 1) return LAPB_INVALUE; if (lapb->state == LAPB_STATE_0) { if (parms->mode & LAPB_EXTENDED) { if (parms->window < 1 || parms->window > 127) return LAPB_INVALUE; } else { if (parms->window < 1 || parms->window > 7) return LAPB_INVALUE; } lapb->mode = parms->mode; lapb->window = parms->window; } lapb->t1 = parms->t1 * HZ; lapb->t2 = parms->t2 * HZ; lapb->n2 = parms->n2; return LAPB_OK; } int lapb_connect_request(void *token) { lapb_cb *lapb; if ((lapb = lapb_tokentostruct(token)) == NULL) return LAPB_BADTOKEN; switch (lapb->state) { case LAPB_STATE_1: return LAPB_OK; case LAPB_STATE_3: case LAPB_STATE_4: return LAPB_CONNECTED; } lapb_establish_data_link(lapb); #if LAPB_DEBUG > 0 printk(KERN_DEBUG "lapb: (%p) S0 -> S1\n", lapb->token); #endif lapb->state = LAPB_STATE_1; return LAPB_OK; } int lapb_disconnect_request(void *token) { lapb_cb *lapb; if ((lapb = lapb_tokentostruct(token)) == NULL) return LAPB_BADTOKEN; switch (lapb->state) { case LAPB_STATE_0: return LAPB_NOTCONNECTED; case LAPB_STATE_1: #if LAPB_DEBUG > 1 printk(KERN_DEBUG "lapb: (%p) S1 TX DISC(1)\n", lapb->token); #endif #if LAPB_DEBUG > 0 printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->token); #endif lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND); lapb->state = LAPB_STATE_0; lapb_start_t1timer(lapb); return LAPB_NOTCONNECTED; case LAPB_STATE_2: return LAPB_OK; } lapb_clear_queues(lapb); lapb->n2count = 0; lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND); lapb_start_t1timer(lapb); lapb_stop_t2timer(lapb); lapb->state = LAPB_STATE_2; #if LAPB_DEBUG > 1 printk(KERN_DEBUG "lapb: (%p) S3 DISC(1)\n", lapb->token); #endif #if LAPB_DEBUG > 0 printk(KERN_DEBUG "lapb: (%p) S3 -> S2\n", lapb->token); #endif return LAPB_OK; } int lapb_data_request(void *token, struct sk_buff *skb) { lapb_cb *lapb; if ((lapb = lapb_tokentostruct(token)) == NULL) return LAPB_BADTOKEN; if (lapb->state != LAPB_STATE_3 && lapb->state != LAPB_STATE_4) return LAPB_NOTCONNECTED; skb_queue_tail(&lapb->write_queue, skb); lapb_kick(lapb); return LAPB_OK; } int lapb_data_received(void *token, struct sk_buff *skb) { lapb_cb *lapb; if ((lapb = lapb_tokentostruct(token)) == NULL) return LAPB_BADTOKEN; lapb_data_input(lapb, skb); return LAPB_OK; } void lapb_connect_confirmation(lapb_cb *lapb, int reason) { if (lapb->callbacks.connect_confirmation != NULL) (lapb->callbacks.connect_confirmation)(lapb->token, reason); } void lapb_connect_indication(lapb_cb *lapb, int reason) { if (lapb->callbacks.connect_indication != NULL) (lapb->callbacks.connect_indication)(lapb->token, reason); } void lapb_disconnect_confirmation(lapb_cb *lapb, int reason) { if (lapb->callbacks.disconnect_confirmation != NULL) (lapb->callbacks.disconnect_confirmation)(lapb->token, reason); } void lapb_disconnect_indication(lapb_cb *lapb, int reason) { if (lapb->callbacks.disconnect_indication != NULL) (lapb->callbacks.disconnect_indication)(lapb->token, reason); } int lapb_data_indication(lapb_cb *lapb, struct sk_buff *skb) { if (lapb->callbacks.data_indication != NULL) { return (lapb->callbacks.data_indication)(lapb->token, skb); } kfree_skb(skb); return NET_RX_CN_HIGH; /* For now; must be != NET_RX_DROP */ } int lapb_data_transmit(lapb_cb *lapb, struct sk_buff *skb) { int used = 0; if (lapb->callbacks.data_transmit != NULL) { (lapb->callbacks.data_transmit)(lapb->token, skb); used = 1; } return used; } EXPORT_SYMBOL(lapb_register); EXPORT_SYMBOL(lapb_unregister); EXPORT_SYMBOL(lapb_getparms); EXPORT_SYMBOL(lapb_setparms); EXPORT_SYMBOL(lapb_connect_request); EXPORT_SYMBOL(lapb_disconnect_request); EXPORT_SYMBOL(lapb_data_request); EXPORT_SYMBOL(lapb_data_received); static char banner[] __initdata = KERN_INFO "NET4: LAPB for Linux. Version 0.01 for NET4.0\n"; static int __init lapb_init(void) { printk(banner); return 0; } MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>"); MODULE_DESCRIPTION("The X.25 Link Access Procedure B link layer protocol"); module_init(lapb_init); |