Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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/init.h> |
| 21 | #include <linux/random.h> |
| 22 | |
| 23 | const char *tei_revision = "$Revision: 2.20.2.3 $"; |
| 24 | |
| 25 | #define ID_REQUEST 1 |
| 26 | #define ID_ASSIGNED 2 |
| 27 | #define ID_DENIED 3 |
| 28 | #define ID_CHK_REQ 4 |
| 29 | #define ID_CHK_RES 5 |
| 30 | #define ID_REMOVE 6 |
| 31 | #define ID_VERIFY 7 |
| 32 | |
| 33 | #define TEI_ENTITY_ID 0xf |
| 34 | |
| 35 | static struct Fsm teifsm; |
| 36 | |
| 37 | void tei_handler(struct PStack *st, u_char pr, struct sk_buff *skb); |
| 38 | |
| 39 | enum { |
| 40 | ST_TEI_NOP, |
| 41 | ST_TEI_IDREQ, |
| 42 | ST_TEI_IDVERIFY, |
| 43 | }; |
| 44 | |
| 45 | #define TEI_STATE_COUNT (ST_TEI_IDVERIFY+1) |
| 46 | |
| 47 | static char *strTeiState[] = |
| 48 | { |
| 49 | "ST_TEI_NOP", |
| 50 | "ST_TEI_IDREQ", |
| 51 | "ST_TEI_IDVERIFY", |
| 52 | }; |
| 53 | |
| 54 | enum { |
| 55 | EV_IDREQ, |
| 56 | EV_ASSIGN, |
| 57 | EV_DENIED, |
| 58 | EV_CHKREQ, |
| 59 | EV_REMOVE, |
| 60 | EV_VERIFY, |
| 61 | EV_T202, |
| 62 | }; |
| 63 | |
| 64 | #define TEI_EVENT_COUNT (EV_T202+1) |
| 65 | |
| 66 | static char *strTeiEvent[] = |
| 67 | { |
| 68 | "EV_IDREQ", |
| 69 | "EV_ASSIGN", |
| 70 | "EV_DENIED", |
| 71 | "EV_CHKREQ", |
| 72 | "EV_REMOVE", |
| 73 | "EV_VERIFY", |
| 74 | "EV_T202", |
| 75 | }; |
| 76 | |
Adrian Bunk | 672c3fd | 2005-06-25 14:59:18 -0700 | [diff] [blame] | 77 | static unsigned int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | random_ri(void) |
| 79 | { |
| 80 | unsigned int x; |
| 81 | |
| 82 | get_random_bytes(&x, sizeof(x)); |
| 83 | return (x & 0xffff); |
| 84 | } |
| 85 | |
| 86 | static struct PStack * |
| 87 | findtei(struct PStack *st, int tei) |
| 88 | { |
| 89 | struct PStack *ptr = *(st->l1.stlistp); |
| 90 | |
| 91 | if (tei == 127) |
| 92 | return (NULL); |
| 93 | |
| 94 | while (ptr) |
| 95 | if (ptr->l2.tei == tei) |
| 96 | return (ptr); |
| 97 | else |
| 98 | ptr = ptr->next; |
| 99 | return (NULL); |
| 100 | } |
| 101 | |
| 102 | static void |
| 103 | put_tei_msg(struct PStack *st, u_char m_id, unsigned int ri, u_char tei) |
| 104 | { |
| 105 | struct sk_buff *skb; |
| 106 | u_char *bp; |
| 107 | |
| 108 | if (!(skb = alloc_skb(8, GFP_ATOMIC))) { |
| 109 | printk(KERN_WARNING "HiSax: No skb for TEI manager\n"); |
| 110 | return; |
| 111 | } |
| 112 | bp = skb_put(skb, 3); |
| 113 | bp[0] = (TEI_SAPI << 2); |
| 114 | bp[1] = (GROUP_TEI << 1) | 0x1; |
| 115 | bp[2] = UI; |
| 116 | bp = skb_put(skb, 5); |
| 117 | bp[0] = TEI_ENTITY_ID; |
| 118 | bp[1] = ri >> 8; |
| 119 | bp[2] = ri & 0xff; |
| 120 | bp[3] = m_id; |
| 121 | bp[4] = (tei << 1) | 1; |
| 122 | st->l2.l2l1(st, PH_DATA | REQUEST, skb); |
| 123 | } |
| 124 | |
| 125 | static void |
| 126 | tei_id_request(struct FsmInst *fi, int event, void *arg) |
| 127 | { |
| 128 | struct PStack *st = fi->userdata; |
| 129 | |
| 130 | if (st->l2.tei != -1) { |
| 131 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 132 | "assign request for allready asigned tei %d", |
| 133 | st->l2.tei); |
| 134 | return; |
| 135 | } |
| 136 | st->ma.ri = random_ri(); |
| 137 | if (st->ma.debug) |
| 138 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 139 | "assign request ri %d", st->ma.ri); |
| 140 | put_tei_msg(st, ID_REQUEST, st->ma.ri, 127); |
| 141 | FsmChangeState(&st->ma.tei_m, ST_TEI_IDREQ); |
| 142 | FsmAddTimer(&st->ma.t202, st->ma.T202, EV_T202, NULL, 1); |
| 143 | st->ma.N202 = 3; |
| 144 | } |
| 145 | |
| 146 | static void |
| 147 | tei_id_assign(struct FsmInst *fi, int event, void *arg) |
| 148 | { |
| 149 | struct PStack *ost, *st = fi->userdata; |
| 150 | struct sk_buff *skb = arg; |
| 151 | struct IsdnCardState *cs; |
| 152 | int ri, tei; |
| 153 | |
| 154 | ri = ((unsigned int) skb->data[1] << 8) + skb->data[2]; |
| 155 | tei = skb->data[4] >> 1; |
| 156 | if (st->ma.debug) |
| 157 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 158 | "identity assign ri %d tei %d", ri, tei); |
| 159 | if ((ost = findtei(st, tei))) { /* same tei is in use */ |
| 160 | if (ri != ost->ma.ri) { |
| 161 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 162 | "possible duplicate assignment tei %d", tei); |
| 163 | ost->l2.l2tei(ost, MDL_ERROR | RESPONSE, NULL); |
| 164 | } |
| 165 | } else if (ri == st->ma.ri) { |
| 166 | FsmDelTimer(&st->ma.t202, 1); |
| 167 | FsmChangeState(&st->ma.tei_m, ST_TEI_NOP); |
| 168 | st->l3.l3l2(st, MDL_ASSIGN | REQUEST, (void *) (long) tei); |
| 169 | cs = (struct IsdnCardState *) st->l1.hardware; |
| 170 | cs->cardmsg(cs, MDL_ASSIGN | REQUEST, NULL); |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | static void |
| 175 | tei_id_test_dup(struct FsmInst *fi, int event, void *arg) |
| 176 | { |
| 177 | struct PStack *ost, *st = fi->userdata; |
| 178 | struct sk_buff *skb = arg; |
| 179 | int tei, ri; |
| 180 | |
| 181 | ri = ((unsigned int) skb->data[1] << 8) + skb->data[2]; |
| 182 | tei = skb->data[4] >> 1; |
| 183 | if (st->ma.debug) |
| 184 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 185 | "foreign identity assign ri %d tei %d", ri, tei); |
| 186 | if ((ost = findtei(st, tei))) { /* same tei is in use */ |
| 187 | if (ri != ost->ma.ri) { /* and it wasn't our request */ |
| 188 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 189 | "possible duplicate assignment tei %d", tei); |
| 190 | FsmEvent(&ost->ma.tei_m, EV_VERIFY, NULL); |
| 191 | } |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | static void |
| 196 | tei_id_denied(struct FsmInst *fi, int event, void *arg) |
| 197 | { |
| 198 | struct PStack *st = fi->userdata; |
| 199 | struct sk_buff *skb = arg; |
| 200 | int ri, tei; |
| 201 | |
| 202 | ri = ((unsigned int) skb->data[1] << 8) + skb->data[2]; |
| 203 | tei = skb->data[4] >> 1; |
| 204 | if (st->ma.debug) |
| 205 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 206 | "identity denied ri %d tei %d", ri, tei); |
| 207 | } |
| 208 | |
| 209 | static void |
| 210 | tei_id_chk_req(struct FsmInst *fi, int event, void *arg) |
| 211 | { |
| 212 | struct PStack *st = fi->userdata; |
| 213 | struct sk_buff *skb = arg; |
| 214 | int tei; |
| 215 | |
| 216 | tei = skb->data[4] >> 1; |
| 217 | if (st->ma.debug) |
| 218 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 219 | "identity check req tei %d", tei); |
| 220 | if ((st->l2.tei != -1) && ((tei == GROUP_TEI) || (tei == st->l2.tei))) { |
| 221 | FsmDelTimer(&st->ma.t202, 4); |
| 222 | FsmChangeState(&st->ma.tei_m, ST_TEI_NOP); |
| 223 | put_tei_msg(st, ID_CHK_RES, random_ri(), st->l2.tei); |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | static void |
| 228 | tei_id_remove(struct FsmInst *fi, int event, void *arg) |
| 229 | { |
| 230 | struct PStack *st = fi->userdata; |
| 231 | struct sk_buff *skb = arg; |
| 232 | struct IsdnCardState *cs; |
| 233 | int tei; |
| 234 | |
| 235 | tei = skb->data[4] >> 1; |
| 236 | if (st->ma.debug) |
| 237 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 238 | "identity remove tei %d", tei); |
| 239 | if ((st->l2.tei != -1) && ((tei == GROUP_TEI) || (tei == st->l2.tei))) { |
| 240 | FsmDelTimer(&st->ma.t202, 5); |
| 241 | FsmChangeState(&st->ma.tei_m, ST_TEI_NOP); |
| 242 | st->l3.l3l2(st, MDL_REMOVE | REQUEST, NULL); |
| 243 | cs = (struct IsdnCardState *) st->l1.hardware; |
| 244 | cs->cardmsg(cs, MDL_REMOVE | REQUEST, NULL); |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | static void |
| 249 | tei_id_verify(struct FsmInst *fi, int event, void *arg) |
| 250 | { |
| 251 | struct PStack *st = fi->userdata; |
| 252 | |
| 253 | if (st->ma.debug) |
| 254 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 255 | "id verify request for tei %d", st->l2.tei); |
| 256 | put_tei_msg(st, ID_VERIFY, 0, st->l2.tei); |
| 257 | FsmChangeState(&st->ma.tei_m, ST_TEI_IDVERIFY); |
| 258 | FsmAddTimer(&st->ma.t202, st->ma.T202, EV_T202, NULL, 2); |
| 259 | st->ma.N202 = 2; |
| 260 | } |
| 261 | |
| 262 | static void |
| 263 | tei_id_req_tout(struct FsmInst *fi, int event, void *arg) |
| 264 | { |
| 265 | struct PStack *st = fi->userdata; |
| 266 | struct IsdnCardState *cs; |
| 267 | |
| 268 | if (--st->ma.N202) { |
| 269 | st->ma.ri = random_ri(); |
| 270 | if (st->ma.debug) |
| 271 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 272 | "assign req(%d) ri %d", 4 - st->ma.N202, |
| 273 | st->ma.ri); |
| 274 | put_tei_msg(st, ID_REQUEST, st->ma.ri, 127); |
| 275 | FsmAddTimer(&st->ma.t202, st->ma.T202, EV_T202, NULL, 3); |
| 276 | } else { |
| 277 | st->ma.tei_m.printdebug(&st->ma.tei_m, "assign req failed"); |
| 278 | st->l3.l3l2(st, MDL_ERROR | RESPONSE, NULL); |
| 279 | cs = (struct IsdnCardState *) st->l1.hardware; |
| 280 | cs->cardmsg(cs, MDL_REMOVE | REQUEST, NULL); |
| 281 | FsmChangeState(fi, ST_TEI_NOP); |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | static void |
| 286 | tei_id_ver_tout(struct FsmInst *fi, int event, void *arg) |
| 287 | { |
| 288 | struct PStack *st = fi->userdata; |
| 289 | struct IsdnCardState *cs; |
| 290 | |
| 291 | if (--st->ma.N202) { |
| 292 | if (st->ma.debug) |
| 293 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 294 | "id verify req(%d) for tei %d", |
| 295 | 3 - st->ma.N202, st->l2.tei); |
| 296 | put_tei_msg(st, ID_VERIFY, 0, st->l2.tei); |
| 297 | FsmAddTimer(&st->ma.t202, st->ma.T202, EV_T202, NULL, 4); |
| 298 | } else { |
| 299 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 300 | "verify req for tei %d failed", st->l2.tei); |
| 301 | st->l3.l3l2(st, MDL_REMOVE | REQUEST, NULL); |
| 302 | cs = (struct IsdnCardState *) st->l1.hardware; |
| 303 | cs->cardmsg(cs, MDL_REMOVE | REQUEST, NULL); |
| 304 | FsmChangeState(fi, ST_TEI_NOP); |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | static void |
| 309 | tei_l1l2(struct PStack *st, int pr, void *arg) |
| 310 | { |
| 311 | struct sk_buff *skb = arg; |
| 312 | int mt; |
| 313 | |
| 314 | if (test_bit(FLG_FIXED_TEI, &st->l2.flag)) { |
| 315 | dev_kfree_skb(skb); |
| 316 | return; |
| 317 | } |
| 318 | |
| 319 | if (pr == (PH_DATA | INDICATION)) { |
| 320 | if (skb->len < 3) { |
| 321 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 322 | "short mgr frame %ld/3", skb->len); |
| 323 | } else if ((skb->data[0] != ((TEI_SAPI << 2) | 2)) || |
| 324 | (skb->data[1] != ((GROUP_TEI << 1) | 1))) { |
| 325 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 326 | "wrong mgr sapi/tei %x/%x", |
| 327 | skb->data[0], skb->data[1]); |
| 328 | } else if ((skb->data[2] & 0xef) != UI) { |
| 329 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 330 | "mgr frame is not ui %x", skb->data[2]); |
| 331 | } else { |
| 332 | skb_pull(skb, 3); |
| 333 | if (skb->len < 5) { |
| 334 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 335 | "short mgr frame %ld/5", skb->len); |
| 336 | } else if (skb->data[0] != TEI_ENTITY_ID) { |
| 337 | /* wrong management entity identifier, ignore */ |
| 338 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 339 | "tei handler wrong entity id %x", |
| 340 | skb->data[0]); |
| 341 | } else { |
| 342 | mt = skb->data[3]; |
| 343 | if (mt == ID_ASSIGNED) |
| 344 | FsmEvent(&st->ma.tei_m, EV_ASSIGN, skb); |
| 345 | else if (mt == ID_DENIED) |
| 346 | FsmEvent(&st->ma.tei_m, EV_DENIED, skb); |
| 347 | else if (mt == ID_CHK_REQ) |
| 348 | FsmEvent(&st->ma.tei_m, EV_CHKREQ, skb); |
| 349 | else if (mt == ID_REMOVE) |
| 350 | FsmEvent(&st->ma.tei_m, EV_REMOVE, skb); |
| 351 | else { |
| 352 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 353 | "tei handler wrong mt %x\n", mt); |
| 354 | } |
| 355 | } |
| 356 | } |
| 357 | } else { |
| 358 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 359 | "tei handler wrong pr %x\n", pr); |
| 360 | } |
| 361 | dev_kfree_skb(skb); |
| 362 | } |
| 363 | |
| 364 | static void |
| 365 | tei_l2tei(struct PStack *st, int pr, void *arg) |
| 366 | { |
| 367 | struct IsdnCardState *cs; |
| 368 | |
| 369 | if (test_bit(FLG_FIXED_TEI, &st->l2.flag)) { |
| 370 | if (pr == (MDL_ASSIGN | INDICATION)) { |
| 371 | if (st->ma.debug) |
| 372 | st->ma.tei_m.printdebug(&st->ma.tei_m, |
| 373 | "fixed assign tei %d", st->l2.tei); |
| 374 | st->l3.l3l2(st, MDL_ASSIGN | REQUEST, (void *) (long) st->l2.tei); |
| 375 | cs = (struct IsdnCardState *) st->l1.hardware; |
| 376 | cs->cardmsg(cs, MDL_ASSIGN | REQUEST, NULL); |
| 377 | } |
| 378 | return; |
| 379 | } |
| 380 | switch (pr) { |
| 381 | case (MDL_ASSIGN | INDICATION): |
| 382 | FsmEvent(&st->ma.tei_m, EV_IDREQ, arg); |
| 383 | break; |
| 384 | case (MDL_ERROR | REQUEST): |
| 385 | FsmEvent(&st->ma.tei_m, EV_VERIFY, arg); |
| 386 | break; |
| 387 | default: |
| 388 | break; |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | static void |
| 393 | tei_debug(struct FsmInst *fi, char *fmt, ...) |
| 394 | { |
| 395 | va_list args; |
| 396 | struct PStack *st = fi->userdata; |
| 397 | |
| 398 | va_start(args, fmt); |
| 399 | VHiSax_putstatus(st->l1.hardware, "tei ", fmt, args); |
| 400 | va_end(args); |
| 401 | } |
| 402 | |
| 403 | void |
| 404 | setstack_tei(struct PStack *st) |
| 405 | { |
| 406 | st->l2.l2tei = tei_l2tei; |
| 407 | st->ma.T202 = 2000; /* T202 2000 milliseconds */ |
| 408 | st->l1.l1tei = tei_l1l2; |
| 409 | st->ma.debug = 1; |
| 410 | st->ma.tei_m.fsm = &teifsm; |
| 411 | st->ma.tei_m.state = ST_TEI_NOP; |
| 412 | st->ma.tei_m.debug = 1; |
| 413 | st->ma.tei_m.userdata = st; |
| 414 | st->ma.tei_m.userint = 0; |
| 415 | st->ma.tei_m.printdebug = tei_debug; |
| 416 | FsmInitTimer(&st->ma.tei_m, &st->ma.t202); |
| 417 | } |
| 418 | |
| 419 | void |
| 420 | init_tei(struct IsdnCardState *cs, int protocol) |
| 421 | { |
| 422 | } |
| 423 | |
| 424 | void |
| 425 | release_tei(struct IsdnCardState *cs) |
| 426 | { |
| 427 | struct PStack *st = cs->stlist; |
| 428 | |
| 429 | while (st) { |
| 430 | FsmDelTimer(&st->ma.t202, 1); |
| 431 | st = st->next; |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | static struct FsmNode TeiFnList[] __initdata = |
| 436 | { |
| 437 | {ST_TEI_NOP, EV_IDREQ, tei_id_request}, |
| 438 | {ST_TEI_NOP, EV_ASSIGN, tei_id_test_dup}, |
| 439 | {ST_TEI_NOP, EV_VERIFY, tei_id_verify}, |
| 440 | {ST_TEI_NOP, EV_REMOVE, tei_id_remove}, |
| 441 | {ST_TEI_NOP, EV_CHKREQ, tei_id_chk_req}, |
| 442 | {ST_TEI_IDREQ, EV_T202, tei_id_req_tout}, |
| 443 | {ST_TEI_IDREQ, EV_ASSIGN, tei_id_assign}, |
| 444 | {ST_TEI_IDREQ, EV_DENIED, tei_id_denied}, |
| 445 | {ST_TEI_IDVERIFY, EV_T202, tei_id_ver_tout}, |
| 446 | {ST_TEI_IDVERIFY, EV_REMOVE, tei_id_remove}, |
| 447 | {ST_TEI_IDVERIFY, EV_CHKREQ, tei_id_chk_req}, |
| 448 | }; |
| 449 | |
| 450 | #define TEI_FN_COUNT (sizeof(TeiFnList)/sizeof(struct FsmNode)) |
| 451 | |
| 452 | int __init |
| 453 | TeiNew(void) |
| 454 | { |
| 455 | teifsm.state_count = TEI_STATE_COUNT; |
| 456 | teifsm.event_count = TEI_EVENT_COUNT; |
| 457 | teifsm.strEvent = strTeiEvent; |
| 458 | teifsm.strState = strTeiState; |
| 459 | return FsmNew(&teifsm, TeiFnList, TEI_FN_COUNT); |
| 460 | } |
| 461 | |
| 462 | void |
| 463 | TeiFree(void) |
| 464 | { |
| 465 | FsmFree(&teifsm); |
| 466 | } |