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   1 /* $Id: isdnl3.c,v 2.22.2.3 2004/01/13 14:31:25 keil Exp $
   2  *
   3  * Author       Karsten Keil
   4  *              based on the teles driver from Jan den Ouden
   5  * Copyright    by Karsten Keil      <keil@isdn4linux.de>
   6  *
   7  * This software may be used and distributed according to the terms
   8  * of the GNU General Public License, incorporated herein by reference.
   9  *
  10  * For changes and modifications please read
  11  * Documentation/isdn/HiSax.cert
  12  *
  13  * Thanks to    Jan den Ouden
  14  *              Fritz Elfert
  15  *
  16  */
  17
  18 #include <linux/init.h>
  19 #include "hisax.h"
  20 #include "isdnl3.h"
  21
  22 const char *l3_revision = "$Revision: 2.22.2.3 $";
  23
  24 static struct Fsm l3fsm;
  25
  26 enum {
  27         ST_L3_LC_REL,
  28         ST_L3_LC_ESTAB_WAIT,
  29         ST_L3_LC_REL_DELAY,
  30         ST_L3_LC_REL_WAIT,
  31         ST_L3_LC_ESTAB,
  32 };
  33
  34 #define L3_STATE_COUNT (ST_L3_LC_ESTAB+1)
  35
  36 static char *strL3State[] =
  37 {
  38         "ST_L3_LC_REL",
  39         "ST_L3_LC_ESTAB_WAIT",
  40         "ST_L3_LC_REL_DELAY",
  41         "ST_L3_LC_REL_WAIT",
  42         "ST_L3_LC_ESTAB",
  43 };
  44
  45 enum {
  46         EV_ESTABLISH_REQ,
  47         EV_ESTABLISH_IND,
  48         EV_ESTABLISH_CNF,
  49         EV_RELEASE_REQ,
  50         EV_RELEASE_CNF,
  51         EV_RELEASE_IND,
  52         EV_TIMEOUT,
  53 };
  54
  55 #define L3_EVENT_COUNT (EV_TIMEOUT+1)
  56
  57 static char *strL3Event[] =
  58 {
  59         "EV_ESTABLISH_REQ",
  60         "EV_ESTABLISH_IND",
  61         "EV_ESTABLISH_CNF",
  62         "EV_RELEASE_REQ",
  63         "EV_RELEASE_CNF",
  64         "EV_RELEASE_IND",
  65         "EV_TIMEOUT",
  66 };
  67
  68 static void
  69 l3m_debug(struct FsmInst *fi, char *fmt, ...)
  70 {
  71         va_list args;
  72         struct PStack *st = fi->userdata;
  73
  74         va_start(args, fmt);
  75         VHiSax_putstatus(st->l1.hardware, st->l3.debug_id, fmt, args);
  76         va_end(args);
  77 }
  78
  79 u_char *
  80 findie(u_char * p, int size, u_char ie, int wanted_set)
  81 {
  82         int l, codeset, maincodeset;
  83         u_char *pend = p + size;
  84
  85         /* skip protocol discriminator, callref and message type */
  86         p++;
  87         l = (*p++) & 0xf;
  88         p += l;
  89         p++;
  90         codeset = 0;
  91         maincodeset = 0;
  92         /* while there are bytes left... */
  93         while (p < pend) {
  94                 if ((*p & 0xf0) == 0x90) {
  95                         codeset = *p & 0x07;
  96                         if (!(*p & 0x08))
  97                                 maincodeset = codeset;
  98                 }
  99                 if (*p & 0x80)
 100                         p++;
 101                 else {
 102                         if (codeset == wanted_set) {
 103                                 if (*p == ie)
 104                                   { /* improved length check (Werner Cornelius) */
 105                                     if ((pend - p) < 2)
 106                                       return(NULL);
 107                                     if (*(p+1) > (pend - (p+2)))
 108                                       return(NULL);
 109                                     return (p);
 110                                   }
 111
 112                                 if (*p > ie)
 113                                         return (NULL);
 114                         }
 115                         p++;
 116                         l = *p++;
 117                         p += l;
 118                         codeset = maincodeset;
 119                 }
 120         }
 121         return (NULL);
 122 }
 123
 124 int
 125 getcallref(u_char * p)
 126 {
 127         int l, cr = 0;
 128
 129         p++;                    /* prot discr */
 130         if (*p & 0xfe)          /* wrong callref BRI only 1 octet*/
 131                 return(-2);
 132         l = 0xf & *p++;         /* callref length */
 133         if (!l)                 /* dummy CallRef */
 134                 return(-1);
 135         cr = *p++;
 136         return (cr);
 137 }
 138
 139 static int OrigCallRef = 0;
 140
 141 int
 142 newcallref(void)
 143 {
 144         if (OrigCallRef == 127)
 145                 OrigCallRef = 1;
 146         else
 147                 OrigCallRef++;
 148         return (OrigCallRef);
 149 }
 150
 151 void
 152 newl3state(struct l3_process *pc, int state)
 153 {
 154         if (pc->debug & L3_DEB_STATE)
 155                 l3_debug(pc->st, "newstate cr %d %d --> %d",
 156                          pc->callref & 0x7F,
 157                          pc->state, state);
 158         pc->state = state;
 159 }
 160
 161 static void
 162 L3ExpireTimer(struct L3Timer *t)
 163 {
 164         t->pc->st->lli.l4l3(t->pc->st, t->event, t->pc);
 165 }
 166
 167 void
 168 L3InitTimer(struct l3_process *pc, struct L3Timer *t)
 169 {
 170         t->pc = pc;
 171         t->tl.function = (void *) L3ExpireTimer;
 172         t->tl.data = (long) t;
 173         init_timer(&t->tl);
 174 }
 175
 176 void
 177 L3DelTimer(struct L3Timer *t)
 178 {
 179         del_timer(&t->tl);
 180 }
 181
 182 int
 183 L3AddTimer(struct L3Timer *t,
 184            int millisec, int event)
 185 {
 186         if (timer_pending(&t->tl)) {
 187                 printk(KERN_WARNING "L3AddTimer: timer already active!\n");
 188                 return -1;
 189         }
 190         init_timer(&t->tl);
 191         t->event = event;
 192         t->tl.expires = jiffies + (millisec * HZ) / 1000;
 193         add_timer(&t->tl);
 194         return 0;
 195 }
 196
 197 void
 198 StopAllL3Timer(struct l3_process *pc)
 199 {
 200         L3DelTimer(&pc->timer);
 201 }
 202
 203 struct sk_buff *
 204 l3_alloc_skb(int len)
 205 {
 206         struct sk_buff *skb;
 207
 208         if (!(skb = alloc_skb(len + MAX_HEADER_LEN, GFP_ATOMIC))) {
 209                 printk(KERN_WARNING "HiSax: No skb for D-channel\n");
 210                 return (NULL);
 211         }
 212         skb_reserve(skb, MAX_HEADER_LEN);
 213         return (skb);
 214 }
 215
 216 static void
 217 no_l3_proto(struct PStack *st, int pr, void *arg)
 218 {
 219         struct sk_buff *skb = arg;
 220
 221         HiSax_putstatus(st->l1.hardware, "L3", "no D protocol");
 222         if (skb) {
 223                 dev_kfree_skb(skb);
 224         }
 225 }
 226
 227 static int
 228 no_l3_proto_spec(struct PStack *st, isdn_ctrl *ic)
 229 {
 230         printk(KERN_WARNING "HiSax: no specific protocol handler for proto %lu\n",ic->arg & 0xFF);
 231         return(-1);
 232 }
 233
 234 struct l3_process
 235 *getl3proc(struct PStack *st, int cr)
 236 {
 237         struct l3_process *p = st->l3.proc;
 238
 239         while (p)
 240                 if (p->callref == cr)
 241                         return (p);
 242                 else
 243                         p = p->next;
 244         return (NULL);
 245 }
 246
 247 struct l3_process
 248 *new_l3_process(struct PStack *st, int cr)
 249 {
 250         struct l3_process *p, *np;
 251
 252         if (!(p = kmalloc(sizeof(struct l3_process), GFP_ATOMIC))) {
 253                 printk(KERN_ERR "HiSax can't get memory for cr %d\n", cr);
 254                 return (NULL);
 255         }
 256         if (!st->l3.proc)
 257                 st->l3.proc = p;
 258         else {
 259                 np = st->l3.proc;
 260                 while (np->next)
 261                         np = np->next;
 262                 np->next = p;
 263         }
 264         p->next = NULL;
 265         p->debug = st->l3.debug;
 266         p->callref = cr;
 267         p->state = 0;
 268         p->chan = NULL;
 269         p->st = st;
 270         p->N303 = st->l3.N303;
 271         L3InitTimer(p, &p->timer);
 272         return (p);
 273 };
 274
 275 void
 276 release_l3_process(struct l3_process *p)
 277 {
 278         struct l3_process *np, *pp = NULL;
 279
 280         if (!p)
 281                 return;
 282         np = p->st->l3.proc;
 283         while (np) {
 284                 if (np == p) {
 285                         StopAllL3Timer(p);
 286                         if (pp)
 287                                 pp->next = np->next;
 288                         else if (!(p->st->l3.proc = np->next) &&
 289                                 !test_bit(FLG_PTP, &p->st->l2.flag)) {
 290                                 if (p->debug)
 291                                         l3_debug(p->st, "release_l3_process: last process");
 292                                 if (skb_queue_empty(&p->st->l3.squeue)) {
 293                                         if (p->debug)
 294                                                 l3_debug(p->st, "release_l3_process: release link");
 295                                         if (p->st->protocol != ISDN_PTYPE_NI1)
 296                                                 FsmEvent(&p->st->l3.l3m, EV_RELEASE_REQ, NULL);
 297                                         else
 298                                                 FsmEvent(&p->st->l3.l3m, EV_RELEASE_IND, NULL);
 299                                 } else {
 300                                         if (p->debug)
 301                                                 l3_debug(p->st, "release_l3_process: not release link");
 302                                 }
 303                         }
 304                         kfree(p);
 305                         return;
 306                 }
 307                 pp = np;
 308                 np = np->next;
 309         }
 310         printk(KERN_ERR "HiSax internal L3 error CR(%d) not in list\n", p->callref);
 311         l3_debug(p->st, "HiSax internal L3 error CR(%d) not in list", p->callref);
 312 };
 313
 314 static void
 315 l3ml3p(struct PStack *st, int pr)
 316 {
 317         struct l3_process *p = st->l3.proc;
 318         struct l3_process *np;
 319
 320         while (p) {
 321                 /* p might be kfreed under us, so we need to save where we want to go on */
 322                 np = p->next;
 323                 st->l3.l3ml3(st, pr, p);
 324                 p = np;
 325         }
 326 }
 327
 328 void
 329 setstack_l3dc(struct PStack *st, struct Channel *chanp)
 330 {
 331         char tmp[64];
 332
 333         st->l3.proc   = NULL;
 334         st->l3.global = NULL;
 335         skb_queue_head_init(&st->l3.squeue);
 336         st->l3.l3m.fsm = &l3fsm;
 337         st->l3.l3m.state = ST_L3_LC_REL;
 338         st->l3.l3m.debug = 1;
 339         st->l3.l3m.userdata = st;
 340         st->l3.l3m.userint = 0;
 341         st->l3.l3m.printdebug = l3m_debug;
 342         FsmInitTimer(&st->l3.l3m, &st->l3.l3m_timer);
 343         strcpy(st->l3.debug_id, "L3DC ");
 344         st->lli.l4l3_proto = no_l3_proto_spec;
 345
 346 #ifdef  CONFIG_HISAX_EURO
 347         if (st->protocol == ISDN_PTYPE_EURO) {
 348                 setstack_dss1(st);
 349         } else
 350 #endif
 351 #ifdef  CONFIG_HISAX_NI1
 352         if (st->protocol == ISDN_PTYPE_NI1) {
 353                 setstack_ni1(st);
 354         } else
 355 #endif
 356 #ifdef  CONFIG_HISAX_1TR6
 357         if (st->protocol == ISDN_PTYPE_1TR6) {
 358                 setstack_1tr6(st);
 359         } else
 360 #endif
 361         if (st->protocol == ISDN_PTYPE_LEASED) {
 362                 st->lli.l4l3 = no_l3_proto;
 363                 st->l2.l2l3 = no_l3_proto;
 364                 st->l3.l3ml3 = no_l3_proto;
 365                 printk(KERN_INFO "HiSax: Leased line mode\n");
 366         } else {
 367                 st->lli.l4l3 = no_l3_proto;
 368                 st->l2.l2l3 = no_l3_proto;
 369                 st->l3.l3ml3 = no_l3_proto;
 370                 sprintf(tmp, "protocol %s not supported",
 371                         (st->protocol == ISDN_PTYPE_1TR6) ? "1tr6" :
 372                         (st->protocol == ISDN_PTYPE_EURO) ? "euro" :
 373                         (st->protocol == ISDN_PTYPE_NI1) ? "ni1" :
 374                         "unknown");
 375                 printk(KERN_WARNING "HiSax: %s\n", tmp);
 376                 st->protocol = -1;
 377         }
 378 }
 379
 380 static void
 381 isdnl3_trans(struct PStack *st, int pr, void *arg) {
 382         st->l3.l3l2(st, pr, arg);
 383 }
 384
 385 void
 386 releasestack_isdnl3(struct PStack *st)
 387 {
 388         while (st->l3.proc)
 389                 release_l3_process(st->l3.proc);
 390         if (st->l3.global) {
 391                 StopAllL3Timer(st->l3.global);
 392                 kfree(st->l3.global);
 393                 st->l3.global = NULL;
 394         }
 395         FsmDelTimer(&st->l3.l3m_timer, 54);
 396         skb_queue_purge(&st->l3.squeue);
 397 }
 398
 399 void
 400 setstack_l3bc(struct PStack *st, struct Channel *chanp)
 401 {
 402
 403         st->l3.proc   = NULL;
 404         st->l3.global = NULL;
 405         skb_queue_head_init(&st->l3.squeue);
 406         st->l3.l3m.fsm = &l3fsm;
 407         st->l3.l3m.state = ST_L3_LC_REL;
 408         st->l3.l3m.debug = 1;
 409         st->l3.l3m.userdata = st;
 410         st->l3.l3m.userint = 0;
 411         st->l3.l3m.printdebug = l3m_debug;
 412         strcpy(st->l3.debug_id, "L3BC ");
 413         st->lli.l4l3 = isdnl3_trans;
 414 }
 415
 416 #define DREL_TIMER_VALUE 40000
 417
 418 static void
 419 lc_activate(struct FsmInst *fi, int event, void *arg)
 420 {
 421         struct PStack *st = fi->userdata;
 422
 423         FsmChangeState(fi, ST_L3_LC_ESTAB_WAIT);
 424         st->l3.l3l2(st, DL_ESTABLISH | REQUEST, NULL);
 425 }
 426
 427 static void
 428 lc_connect(struct FsmInst *fi, int event, void *arg)
 429 {
 430         struct PStack *st = fi->userdata;
 431         struct sk_buff *skb = arg;
 432         int dequeued = 0;
 433
 434         FsmChangeState(fi, ST_L3_LC_ESTAB);
 435         while ((skb = skb_dequeue(&st->l3.squeue))) {
 436                 st->l3.l3l2(st, DL_DATA | REQUEST, skb);
 437                 dequeued++;
 438         }
 439         if ((!st->l3.proc) &&  dequeued) {
 440                 if (st->l3.debug)
 441                         l3_debug(st, "lc_connect: release link");
 442                 FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL);
 443         } else
 444                 l3ml3p(st, DL_ESTABLISH | INDICATION);
 445 }
 446
 447 static void
 448 lc_connected(struct FsmInst *fi, int event, void *arg)
 449 {
 450         struct PStack *st = fi->userdata;
 451         struct sk_buff *skb = arg;
 452         int dequeued = 0;
 453
 454         FsmDelTimer(&st->l3.l3m_timer, 51);
 455         FsmChangeState(fi, ST_L3_LC_ESTAB);
 456         while ((skb = skb_dequeue(&st->l3.squeue))) {
 457                 st->l3.l3l2(st, DL_DATA | REQUEST, skb);
 458                 dequeued++;
 459         }
 460         if ((!st->l3.proc) &&  dequeued) {
 461                 if (st->l3.debug)
 462                         l3_debug(st, "lc_connected: release link");
 463                 FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL);
 464         } else
 465                 l3ml3p(st, DL_ESTABLISH | CONFIRM);
 466 }
 467
 468 static void
 469 lc_start_delay(struct FsmInst *fi, int event, void *arg)
 470 {
 471        struct PStack *st = fi->userdata;
 472
 473        FsmChangeState(fi, ST_L3_LC_REL_DELAY);
 474        FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 50);
 475 }
 476
 477 static void
 478 lc_start_delay_check(struct FsmInst *fi, int event, void *arg)
 479 /* 20/09/00 - GE timer not user for NI-1 as layer 2 should stay up */
 480 {
 481        struct PStack *st = fi->userdata;
 482
 483        FsmChangeState(fi, ST_L3_LC_REL_DELAY);
 484        /* 19/09/00 - GE timer not user for NI-1 */
 485        if (st->protocol != ISDN_PTYPE_NI1)
 486                 FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 50);
 487 }
 488
 489 static void
 490 lc_release_req(struct FsmInst *fi, int event, void *arg)
 491 {
 492         struct PStack *st = fi->userdata;
 493
 494         if (test_bit(FLG_L2BLOCK, &st->l2.flag)) {
 495                 if (st->l3.debug)
 496                         l3_debug(st, "lc_release_req: l2 blocked");
 497                 /* restart release timer */
 498                 FsmAddTimer(&st->l3.l3m_timer, DREL_TIMER_VALUE, EV_TIMEOUT, NULL, 51);
 499         } else {
 500                 FsmChangeState(fi, ST_L3_LC_REL_WAIT);
 501                 st->l3.l3l2(st, DL_RELEASE | REQUEST, NULL);
 502         }
 503 }
 504
 505 static void
 506 lc_release_ind(struct FsmInst *fi, int event, void *arg)
 507 {
 508         struct PStack *st = fi->userdata;
 509
 510         FsmDelTimer(&st->l3.l3m_timer, 52);
 511         FsmChangeState(fi, ST_L3_LC_REL);
 512         skb_queue_purge(&st->l3.squeue);
 513         l3ml3p(st, DL_RELEASE | INDICATION);
 514 }
 515
 516 static void
 517 lc_release_cnf(struct FsmInst *fi, int event, void *arg)
 518 {
 519         struct PStack *st = fi->userdata;
 520
 521         FsmChangeState(fi, ST_L3_LC_REL);
 522         skb_queue_purge(&st->l3.squeue);
 523         l3ml3p(st, DL_RELEASE | CONFIRM);
 524 }
 525
 526
 527 /* *INDENT-OFF* */
 528 static struct FsmNode L3FnList[] __initdata =
 529 {
 530         {ST_L3_LC_REL,          EV_ESTABLISH_REQ,       lc_activate},
 531         {ST_L3_LC_REL,          EV_ESTABLISH_IND,       lc_connect},
 532         {ST_L3_LC_REL,          EV_ESTABLISH_CNF,       lc_connect},
 533         {ST_L3_LC_ESTAB_WAIT,   EV_ESTABLISH_CNF,       lc_connected},
 534         {ST_L3_LC_ESTAB_WAIT,   EV_RELEASE_REQ,         lc_start_delay},
 535         {ST_L3_LC_ESTAB_WAIT,   EV_RELEASE_IND,         lc_release_ind},
 536         {ST_L3_LC_ESTAB,        EV_RELEASE_IND,         lc_release_ind},
 537         {ST_L3_LC_ESTAB,        EV_RELEASE_REQ,         lc_start_delay_check},
 538         {ST_L3_LC_REL_DELAY,    EV_RELEASE_IND,         lc_release_ind},
 539         {ST_L3_LC_REL_DELAY,    EV_ESTABLISH_REQ,       lc_connected},
 540         {ST_L3_LC_REL_DELAY,    EV_TIMEOUT,             lc_release_req},
 541         {ST_L3_LC_REL_WAIT,     EV_RELEASE_CNF,         lc_release_cnf},
 542         {ST_L3_LC_REL_WAIT,     EV_ESTABLISH_REQ,       lc_activate},
 543 };
 544 /* *INDENT-ON* */
 545
 546 #define L3_FN_COUNT (sizeof(L3FnList)/sizeof(struct FsmNode))
 547
 548 void
 549 l3_msg(struct PStack *st, int pr, void *arg)
 550 {
 551         switch (pr) {
 552                 case (DL_DATA | REQUEST):
 553                         if (st->l3.l3m.state == ST_L3_LC_ESTAB) {
 554                                 st->l3.l3l2(st, pr, arg);
 555                         } else {
 556                                 struct sk_buff *skb = arg;
 557
 558                                 skb_queue_tail(&st->l3.squeue, skb);
 559                                 FsmEvent(&st->l3.l3m, EV_ESTABLISH_REQ, NULL);
 560                         }
 561                         break;
 562                 case (DL_ESTABLISH | REQUEST):
 563                         FsmEvent(&st->l3.l3m, EV_ESTABLISH_REQ, NULL);
 564                         break;
 565                 case (DL_ESTABLISH | CONFIRM):
 566                         FsmEvent(&st->l3.l3m, EV_ESTABLISH_CNF, NULL);
 567                         break;
 568                 case (DL_ESTABLISH | INDICATION):
 569                         FsmEvent(&st->l3.l3m, EV_ESTABLISH_IND, NULL);
 570                         break;
 571                 case (DL_RELEASE | INDICATION):
 572                         FsmEvent(&st->l3.l3m, EV_RELEASE_IND, NULL);
 573                         break;
 574                 case (DL_RELEASE | CONFIRM):
 575                         FsmEvent(&st->l3.l3m, EV_RELEASE_CNF, NULL);
 576                         break;
 577                 case (DL_RELEASE | REQUEST):
 578                         FsmEvent(&st->l3.l3m, EV_RELEASE_REQ, NULL);
 579                         break;
 580         }
 581 }
 582
 583 int __init
 584 Isdnl3New(void)
 585 {
 586         l3fsm.state_count = L3_STATE_COUNT;
 587         l3fsm.event_count = L3_EVENT_COUNT;
 588         l3fsm.strEvent = strL3Event;
 589         l3fsm.strState = strL3State;
 590         return FsmNew(&l3fsm, L3FnList, L3_FN_COUNT);
 591 }
 592
 593 void
 594 Isdnl3Free(void)
 595 {
 596         FsmFree(&l3fsm);
 597 }