drivers/isdn/hisax/isdnl3.c

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