drivers/isdn/hisax/tei.c

   1 /* $Id: tei.c,v 2.20.2.3 2004/01/13 14:31:26 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 "hisax.h"
  19 #include "isdnl2.h"
  20 #include <linux/gfp.h>
  21 #include <linux/init.h>
  22 #include <linux/random.h>
  23
  24 const char *tei_revision = "$Revision: 2.20.2.3 $";
  25
  26 #define ID_REQUEST      1
  27 #define ID_ASSIGNED     2
  28 #define ID_DENIED       3
  29 #define ID_CHK_REQ      4
  30 #define ID_CHK_RES      5
  31 #define ID_REMOVE       6
  32 #define ID_VERIFY       7
  33
  34 #define TEI_ENTITY_ID   0xf
  35
  36 static struct Fsm teifsm;
  37
  38 void tei_handler(struct PStack *st, u_char pr, struct sk_buff *skb);
  39
  40 enum {
  41         ST_TEI_NOP,
  42         ST_TEI_IDREQ,
  43         ST_TEI_IDVERIFY,
  44 };
  45
  46 #define TEI_STATE_COUNT (ST_TEI_IDVERIFY + 1)
  47
  48 static char *strTeiState[] =
  49 {
  50         "ST_TEI_NOP",
  51         "ST_TEI_IDREQ",
  52         "ST_TEI_IDVERIFY",
  53 };
  54
  55 enum {
  56         EV_IDREQ,
  57         EV_ASSIGN,
  58         EV_DENIED,
  59         EV_CHKREQ,
  60         EV_REMOVE,
  61         EV_VERIFY,
  62         EV_T202,
  63 };
  64
  65 #define TEI_EVENT_COUNT (EV_T202 + 1)
  66
  67 static char *strTeiEvent[] =
  68 {
  69         "EV_IDREQ",
  70         "EV_ASSIGN",
  71         "EV_DENIED",
  72         "EV_CHKREQ",
  73         "EV_REMOVE",
  74         "EV_VERIFY",
  75         "EV_T202",
  76 };
  77
  78 static unsigned int
  79 random_ri(void)
  80 {
  81         unsigned int x;
  82
  83         get_random_bytes(&x, sizeof(x));
  84         return (x & 0xffff);
  85 }
  86
  87 static struct PStack *
  88 findtei(struct PStack *st, int tei)
  89 {
  90         struct PStack *ptr = *(st->l1.stlistp);
  91
  92         if (tei == 127)
  93                 return (NULL);
  94
  95         while (ptr)
  96                 if (ptr->l2.tei == tei)
  97                         return (ptr);
  98                 else
  99                         ptr = ptr->next;
 100         return (NULL);
 101 }
 102
 103 static void
 104 put_tei_msg(struct PStack *st, u_char m_id, unsigned int ri, u_char tei)
 105 {
 106         struct sk_buff *skb;
 107         u_char *bp;
 108
 109         if (!(skb = alloc_skb(8, GFP_ATOMIC))) {
 110                 printk(KERN_WARNING "HiSax: No skb for TEI manager\n");
 111                 return;
 112         }
 113         bp = skb_put(skb, 3);
 114         bp[0] = (TEI_SAPI << 2);
 115         bp[1] = (GROUP_TEI << 1) | 0x1;
 116         bp[2] = UI;
 117         bp = skb_put(skb, 5);
 118         bp[0] = TEI_ENTITY_ID;
 119         bp[1] = ri >> 8;
 120         bp[2] = ri & 0xff;
 121         bp[3] = m_id;
 122         bp[4] = (tei << 1) | 1;
 123         st->l2.l2l1(st, PH_DATA | REQUEST, skb);
 124 }
 125
 126 static void
 127 tei_id_request(struct FsmInst *fi, int event, void *arg)
 128 {
 129         struct PStack *st = fi->userdata;
 130
 131         if (st->l2.tei != -1) {
 132                 st->ma.tei_m.printdebug(&st->ma.tei_m,
 133                                         "assign request for already assigned tei %d",
 134                                         st->l2.tei);
 135                 return;
 136         }
 137         st->ma.ri = random_ri();
 138         if (st->ma.debug)
 139                 st->ma.tei_m.printdebug(&st->ma.tei_m,
 140                                         "assign request ri %d", st->ma.ri);
 141         put_tei_msg(st, ID_REQUEST, st->ma.ri, 127);
 142         FsmChangeState(&st->ma.tei_m, ST_TEI_IDREQ);
 143         FsmAddTimer(&st->ma.t202, st->ma.T202, EV_T202, NULL, 1);
 144         st->ma.N202 = 3;
 145 }
 146
 147 static void
 148 tei_id_assign(struct FsmInst *fi, int event, void *arg)
 149 {
 150         struct PStack *ost, *st = fi->userdata;
 151         struct sk_buff *skb = arg;
 152         struct IsdnCardState *cs;
 153         int ri, tei;
 154
 155         ri = ((unsigned int) skb->data[1] << 8) + skb->data[2];
 156         tei = skb->data[4] >> 1;
 157         if (st->ma.debug)
 158                 st->ma.tei_m.printdebug(&st->ma.tei_m,
 159                                         "identity assign ri %d tei %d", ri, tei);
 160         if ((ost = findtei(st, tei))) { /* same tei is in use */
 161                 if (ri != ost->ma.ri) {
 162                         st->ma.tei_m.printdebug(&st->ma.tei_m,
 163                                                 "possible duplicate assignment tei %d", tei);
 164                         ost->l2.l2tei(ost, MDL_ERROR | RESPONSE, NULL);
 165                 }
 166         } else if (ri == st->ma.ri) {
 167                 FsmDelTimer(&st->ma.t202, 1);
 168                 FsmChangeState(&st->ma.tei_m, ST_TEI_NOP);
 169                 st->l3.l3l2(st, MDL_ASSIGN | REQUEST, (void *) (long) tei);
 170                 cs = (struct IsdnCardState *) st->l1.hardware;
 171                 cs->cardmsg(cs, MDL_ASSIGN | REQUEST, NULL);
 172         }
 173 }
 174
 175 static void
 176 tei_id_test_dup(struct FsmInst *fi, int event, void *arg)
 177 {
 178         struct PStack *ost, *st = fi->userdata;
 179         struct sk_buff *skb = arg;
 180         int tei, ri;
 181
 182         ri = ((unsigned int) skb->data[1] << 8) + skb->data[2];
 183         tei = skb->data[4] >> 1;
 184         if (st->ma.debug)
 185                 st->ma.tei_m.printdebug(&st->ma.tei_m,
 186                                         "foreign identity assign ri %d tei %d", ri, tei);
 187         if ((ost = findtei(st, tei))) { /* same tei is in use */
 188                 if (ri != ost->ma.ri) { /* and it wasn't our request */
 189                         st->ma.tei_m.printdebug(&st->ma.tei_m,
 190                                                 "possible duplicate assignment tei %d", tei);
 191                         FsmEvent(&ost->ma.tei_m, EV_VERIFY, NULL);
 192                 }
 193         }
 194 }
 195
 196 static void
 197 tei_id_denied(struct FsmInst *fi, int event, void *arg)
 198 {
 199         struct PStack *st = fi->userdata;
 200         struct sk_buff *skb = arg;
 201         int ri, tei;
 202
 203         ri = ((unsigned int) skb->data[1] << 8) + skb->data[2];
 204         tei = skb->data[4] >> 1;
 205         if (st->ma.debug)
 206                 st->ma.tei_m.printdebug(&st->ma.tei_m,
 207                                         "identity denied ri %d tei %d", ri, tei);
 208 }
 209
 210 static void
 211 tei_id_chk_req(struct FsmInst *fi, int event, void *arg)
 212 {
 213         struct PStack *st = fi->userdata;
 214         struct sk_buff *skb = arg;
 215         int tei;
 216
 217         tei = skb->data[4] >> 1;
 218         if (st->ma.debug)
 219                 st->ma.tei_m.printdebug(&st->ma.tei_m,
 220                                         "identity check req tei %d", tei);
 221         if ((st->l2.tei != -1) && ((tei == GROUP_TEI) || (tei == st->l2.tei))) {
 222                 FsmDelTimer(&st->ma.t202, 4);
 223                 FsmChangeState(&st->ma.tei_m, ST_TEI_NOP);
 224                 put_tei_msg(st, ID_CHK_RES, random_ri(), st->l2.tei);
 225         }
 226 }
 227
 228 static void
 229 tei_id_remove(struct FsmInst *fi, int event, void *arg)
 230 {
 231         struct PStack *st = fi->userdata;
 232         struct sk_buff *skb = arg;
 233         struct IsdnCardState *cs;
 234         int tei;
 235
 236         tei = skb->data[4] >> 1;
 237         if (st->ma.debug)
 238                 st->ma.tei_m.printdebug(&st->ma.tei_m,
 239                                         "identity remove tei %d", tei);
 240         if ((st->l2.tei != -1) && ((tei == GROUP_TEI) || (tei == st->l2.tei))) {
 241                 FsmDelTimer(&st->ma.t202, 5);
 242                 FsmChangeState(&st->ma.tei_m, ST_TEI_NOP);
 243                 st->l3.l3l2(st, MDL_REMOVE | REQUEST, NULL);
 244                 cs = (struct IsdnCardState *) st->l1.hardware;
 245                 cs->cardmsg(cs, MDL_REMOVE | REQUEST, NULL);
 246         }
 247 }
 248
 249 static void
 250 tei_id_verify(struct FsmInst *fi, int event, void *arg)
 251 {
 252         struct PStack *st = fi->userdata;
 253
 254         if (st->ma.debug)
 255                 st->ma.tei_m.printdebug(&st->ma.tei_m,
 256                                         "id verify request for tei %d", st->l2.tei);
 257         put_tei_msg(st, ID_VERIFY, 0, st->l2.tei);
 258         FsmChangeState(&st->ma.tei_m, ST_TEI_IDVERIFY);
 259         FsmAddTimer(&st->ma.t202, st->ma.T202, EV_T202, NULL, 2);
 260         st->ma.N202 = 2;
 261 }
 262
 263 static void
 264 tei_id_req_tout(struct FsmInst *fi, int event, void *arg)
 265 {
 266         struct PStack *st = fi->userdata;
 267         struct IsdnCardState *cs;
 268
 269         if (--st->ma.N202) {
 270                 st->ma.ri = random_ri();
 271                 if (st->ma.debug)
 272                         st->ma.tei_m.printdebug(&st->ma.tei_m,
 273                                                 "assign req(%d) ri %d", 4 - st->ma.N202,
 274                                                 st->ma.ri);
 275                 put_tei_msg(st, ID_REQUEST, st->ma.ri, 127);
 276                 FsmAddTimer(&st->ma.t202, st->ma.T202, EV_T202, NULL, 3);
 277         } else {
 278                 st->ma.tei_m.printdebug(&st->ma.tei_m, "assign req failed");
 279                 st->l3.l3l2(st, MDL_ERROR | RESPONSE, NULL);
 280                 cs = (struct IsdnCardState *) st->l1.hardware;
 281                 cs->cardmsg(cs, MDL_REMOVE | REQUEST, NULL);
 282                 FsmChangeState(fi, ST_TEI_NOP);
 283         }
 284 }
 285
 286 static void
 287 tei_id_ver_tout(struct FsmInst *fi, int event, void *arg)
 288 {
 289         struct PStack *st = fi->userdata;
 290         struct IsdnCardState *cs;
 291
 292         if (--st->ma.N202) {
 293                 if (st->ma.debug)
 294                         st->ma.tei_m.printdebug(&st->ma.tei_m,
 295                                                 "id verify req(%d) for tei %d",
 296                                                 3 - st->ma.N202, st->l2.tei);
 297                 put_tei_msg(st, ID_VERIFY, 0, st->l2.tei);
 298                 FsmAddTimer(&st->ma.t202, st->ma.T202, EV_T202, NULL, 4);
 299         } else {
 300                 st->ma.tei_m.printdebug(&st->ma.tei_m,
 301                                         "verify req for tei %d failed", st->l2.tei);
 302                 st->l3.l3l2(st, MDL_REMOVE | REQUEST, NULL);
 303                 cs = (struct IsdnCardState *) st->l1.hardware;
 304                 cs->cardmsg(cs, MDL_REMOVE | REQUEST, NULL);
 305                 FsmChangeState(fi, ST_TEI_NOP);
 306         }
 307 }
 308
 309 static void
 310 tei_l1l2(struct PStack *st, int pr, void *arg)
 311 {
 312         struct sk_buff *skb = arg;
 313         int mt;
 314
 315         if (test_bit(FLG_FIXED_TEI, &st->l2.flag)) {
 316                 dev_kfree_skb(skb);
 317                 return;
 318         }
 319
 320         if (pr == (PH_DATA | INDICATION)) {
 321                 if (skb->len < 3) {
 322                         st->ma.tei_m.printdebug(&st->ma.tei_m,
 323                                                 "short mgr frame %ld/3", skb->len);
 324                 } else if ((skb->data[0] != ((TEI_SAPI << 2) | 2)) ||
 325                            (skb->data[1] != ((GROUP_TEI << 1) | 1))) {
 326                         st->ma.tei_m.printdebug(&st->ma.tei_m,
 327                                                 "wrong mgr sapi/tei %x/%x",
 328                                                 skb->data[0], skb->data[1]);
 329                 } else if ((skb->data[2] & 0xef) != UI) {
 330                         st->ma.tei_m.printdebug(&st->ma.tei_m,
 331                                                 "mgr frame is not ui %x", skb->data[2]);
 332                 } else {
 333                         skb_pull(skb, 3);
 334                         if (skb->len < 5) {
 335                                 st->ma.tei_m.printdebug(&st->ma.tei_m,
 336                                                         "short mgr frame %ld/5", skb->len);
 337                         } else if (skb->data[0] != TEI_ENTITY_ID) {
 338                                 /* wrong management entity identifier, ignore */
 339                                 st->ma.tei_m.printdebug(&st->ma.tei_m,
 340                                                         "tei handler wrong entity id %x",
 341                                                         skb->data[0]);
 342                         } else {
 343                                 mt = skb->data[3];
 344                                 if (mt == ID_ASSIGNED)
 345                                         FsmEvent(&st->ma.tei_m, EV_ASSIGN, skb);
 346                                 else if (mt == ID_DENIED)
 347                                         FsmEvent(&st->ma.tei_m, EV_DENIED, skb);
 348                                 else if (mt == ID_CHK_REQ)
 349                                         FsmEvent(&st->ma.tei_m, EV_CHKREQ, skb);
 350                                 else if (mt == ID_REMOVE)
 351                                         FsmEvent(&st->ma.tei_m, EV_REMOVE, skb);
 352                                 else {
 353                                         st->ma.tei_m.printdebug(&st->ma.tei_m,
 354                                                                 "tei handler wrong mt %x\n", mt);
 355                                 }
 356                         }
 357                 }
 358         } else {
 359                 st->ma.tei_m.printdebug(&st->ma.tei_m,
 360                                         "tei handler wrong pr %x\n", pr);
 361         }
 362         dev_kfree_skb(skb);
 363 }
 364
 365 static void
 366 tei_l2tei(struct PStack *st, int pr, void *arg)
 367 {
 368         struct IsdnCardState *cs;
 369
 370         if (test_bit(FLG_FIXED_TEI, &st->l2.flag)) {
 371                 if (pr == (MDL_ASSIGN | INDICATION)) {
 372                         if (st->ma.debug)
 373                                 st->ma.tei_m.printdebug(&st->ma.tei_m,
 374                                                         "fixed assign tei %d", st->l2.tei);
 375                         st->l3.l3l2(st, MDL_ASSIGN | REQUEST, (void *) (long) st->l2.tei);
 376                         cs = (struct IsdnCardState *) st->l1.hardware;
 377                         cs->cardmsg(cs, MDL_ASSIGN | REQUEST, NULL);
 378                 }
 379                 return;
 380         }
 381         switch (pr) {
 382         case (MDL_ASSIGN | INDICATION):
 383                 FsmEvent(&st->ma.tei_m, EV_IDREQ, arg);
 384                 break;
 385         case (MDL_ERROR | REQUEST):
 386                 FsmEvent(&st->ma.tei_m, EV_VERIFY, arg);
 387                 break;
 388         default:
 389                 break;
 390         }
 391 }
 392
 393 static void
 394 tei_debug(struct FsmInst *fi, char *fmt, ...)
 395 {
 396         va_list args;
 397         struct PStack *st = fi->userdata;
 398
 399         va_start(args, fmt);
 400         VHiSax_putstatus(st->l1.hardware, "tei ", fmt, args);
 401         va_end(args);
 402 }
 403
 404 void
 405 setstack_tei(struct PStack *st)
 406 {
 407         st->l2.l2tei = tei_l2tei;
 408         st->ma.T202 = 2000;     /* T202  2000 milliseconds */
 409         st->l1.l1tei = tei_l1l2;
 410         st->ma.debug = 1;
 411         st->ma.tei_m.fsm = &teifsm;
 412         st->ma.tei_m.state = ST_TEI_NOP;
 413         st->ma.tei_m.debug = 1;
 414         st->ma.tei_m.userdata = st;
 415         st->ma.tei_m.userint = 0;
 416         st->ma.tei_m.printdebug = tei_debug;
 417         FsmInitTimer(&st->ma.tei_m, &st->ma.t202);
 418 }
 419
 420 void
 421 init_tei(struct IsdnCardState *cs, int protocol)
 422 {
 423 }
 424
 425 void
 426 release_tei(struct IsdnCardState *cs)
 427 {
 428         struct PStack *st = cs->stlist;
 429
 430         while (st) {
 431                 FsmDelTimer(&st->ma.t202, 1);
 432                 st = st->next;
 433         }
 434 }
 435
 436 static struct FsmNode TeiFnList[] __initdata =
 437 {
 438         {ST_TEI_NOP, EV_IDREQ, tei_id_request},
 439         {ST_TEI_NOP, EV_ASSIGN, tei_id_test_dup},
 440         {ST_TEI_NOP, EV_VERIFY, tei_id_verify},
 441         {ST_TEI_NOP, EV_REMOVE, tei_id_remove},
 442         {ST_TEI_NOP, EV_CHKREQ, tei_id_chk_req},
 443         {ST_TEI_IDREQ, EV_T202, tei_id_req_tout},
 444         {ST_TEI_IDREQ, EV_ASSIGN, tei_id_assign},
 445         {ST_TEI_IDREQ, EV_DENIED, tei_id_denied},
 446         {ST_TEI_IDVERIFY, EV_T202, tei_id_ver_tout},
 447         {ST_TEI_IDVERIFY, EV_REMOVE, tei_id_remove},
 448         {ST_TEI_IDVERIFY, EV_CHKREQ, tei_id_chk_req},
 449 };
 450
 451 int __init
 452 TeiNew(void)
 453 {
 454         teifsm.state_count = TEI_STATE_COUNT;
 455         teifsm.event_count = TEI_EVENT_COUNT;
 456         teifsm.strEvent = strTeiEvent;
 457         teifsm.strState = strTeiState;
 458         return FsmNew(&teifsm, TeiFnList, ARRAY_SIZE(TeiFnList));
 459 }
 460
 461 void
 462 TeiFree(void)
 463 {
 464         FsmFree(&teifsm);
 465 }