1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 4 * Author Karsten Keil <kkeil@novell.com> 5 * 6 * Copyright 2008 by Karsten Keil <kkeil@novell.com> 7 */ 8 9 #include <linux/mISDNif.h> 10 #include <linux/slab.h> 11 #include "core.h" 12 #include "fsm.h" 13 #include "layer2.h" 14 15 static u_int *debug; 16 17 static 18 struct Fsm l2fsm = {NULL, 0, 0, NULL, NULL}; 19 20 static char *strL2State[] = 21 { 22 "ST_L2_1", 23 "ST_L2_2", 24 "ST_L2_3", 25 "ST_L2_4", 26 "ST_L2_5", 27 "ST_L2_6", 28 "ST_L2_7", 29 "ST_L2_8", 30 }; 31 32 enum { 33 EV_L2_UI, 34 EV_L2_SABME, 35 EV_L2_DISC, 36 EV_L2_DM, 37 EV_L2_UA, 38 EV_L2_FRMR, 39 EV_L2_SUPER, 40 EV_L2_I, 41 EV_L2_DL_DATA, 42 EV_L2_ACK_PULL, 43 EV_L2_DL_UNITDATA, 44 EV_L2_DL_ESTABLISH_REQ, 45 EV_L2_DL_RELEASE_REQ, 46 EV_L2_MDL_ASSIGN, 47 EV_L2_MDL_REMOVE, 48 EV_L2_MDL_ERROR, 49 EV_L1_DEACTIVATE, 50 EV_L2_T200, 51 EV_L2_T203, 52 EV_L2_T200I, 53 EV_L2_T203I, 54 EV_L2_SET_OWN_BUSY, 55 EV_L2_CLEAR_OWN_BUSY, 56 EV_L2_FRAME_ERROR, 57 }; 58 59 #define L2_EVENT_COUNT (EV_L2_FRAME_ERROR + 1) 60 61 static char *strL2Event[] = 62 { 63 "EV_L2_UI", 64 "EV_L2_SABME", 65 "EV_L2_DISC", 66 "EV_L2_DM", 67 "EV_L2_UA", 68 "EV_L2_FRMR", 69 "EV_L2_SUPER", 70 "EV_L2_I", 71 "EV_L2_DL_DATA", 72 "EV_L2_ACK_PULL", 73 "EV_L2_DL_UNITDATA", 74 "EV_L2_DL_ESTABLISH_REQ", 75 "EV_L2_DL_RELEASE_REQ", 76 "EV_L2_MDL_ASSIGN", 77 "EV_L2_MDL_REMOVE", 78 "EV_L2_MDL_ERROR", 79 "EV_L1_DEACTIVATE", 80 "EV_L2_T200", 81 "EV_L2_T203", 82 "EV_L2_T200I", 83 "EV_L2_T203I", 84 "EV_L2_SET_OWN_BUSY", 85 "EV_L2_CLEAR_OWN_BUSY", 86 "EV_L2_FRAME_ERROR", 87 }; 88 89 static void l2m_debug(struct FsmInst * fi,char * fmt,...)90 l2m_debug(struct FsmInst *fi, char *fmt, ...) 91 { 92 struct layer2 *l2 = fi->userdata; 93 struct va_format vaf; 94 va_list va; 95 96 if (!(*debug & DEBUG_L2_FSM)) 97 return; 98 99 va_start(va, fmt); 100 101 vaf.fmt = fmt; 102 vaf.va = &va; 103 104 printk(KERN_DEBUG "%s l2 (sapi %d tei %d): %pV\n", 105 mISDNDevName4ch(&l2->ch), l2->sapi, l2->tei, &vaf); 106 107 va_end(va); 108 } 109 110 inline u_int l2headersize(struct layer2 * l2,int ui)111 l2headersize(struct layer2 *l2, int ui) 112 { 113 return ((test_bit(FLG_MOD128, &l2->flag) && (!ui)) ? 2 : 1) + 114 (test_bit(FLG_LAPD, &l2->flag) ? 2 : 1); 115 } 116 117 inline u_int l2addrsize(struct layer2 * l2)118 l2addrsize(struct layer2 *l2) 119 { 120 return test_bit(FLG_LAPD, &l2->flag) ? 2 : 1; 121 } 122 123 static u_int l2_newid(struct layer2 * l2)124 l2_newid(struct layer2 *l2) 125 { 126 u_int id; 127 128 id = l2->next_id++; 129 if (id == 0x7fff) 130 l2->next_id = 1; 131 id <<= 16; 132 id |= l2->tei << 8; 133 id |= l2->sapi; 134 return id; 135 } 136 137 static void l2up(struct layer2 * l2,u_int prim,struct sk_buff * skb)138 l2up(struct layer2 *l2, u_int prim, struct sk_buff *skb) 139 { 140 int err; 141 142 if (!l2->up) 143 return; 144 mISDN_HEAD_PRIM(skb) = prim; 145 mISDN_HEAD_ID(skb) = (l2->ch.nr << 16) | l2->ch.addr; 146 err = l2->up->send(l2->up, skb); 147 if (err) { 148 printk(KERN_WARNING "%s: dev %s err=%d\n", __func__, 149 mISDNDevName4ch(&l2->ch), err); 150 dev_kfree_skb(skb); 151 } 152 } 153 154 static void l2up_create(struct layer2 * l2,u_int prim,int len,void * arg)155 l2up_create(struct layer2 *l2, u_int prim, int len, void *arg) 156 { 157 struct sk_buff *skb; 158 struct mISDNhead *hh; 159 int err; 160 161 if (!l2->up) 162 return; 163 skb = mI_alloc_skb(len, GFP_ATOMIC); 164 if (!skb) 165 return; 166 hh = mISDN_HEAD_P(skb); 167 hh->prim = prim; 168 hh->id = (l2->ch.nr << 16) | l2->ch.addr; 169 if (len) 170 skb_put_data(skb, arg, len); 171 err = l2->up->send(l2->up, skb); 172 if (err) { 173 printk(KERN_WARNING "%s: dev %s err=%d\n", __func__, 174 mISDNDevName4ch(&l2->ch), err); 175 dev_kfree_skb(skb); 176 } 177 } 178 179 static int l2down_skb(struct layer2 * l2,struct sk_buff * skb)180 l2down_skb(struct layer2 *l2, struct sk_buff *skb) { 181 int ret; 182 183 ret = l2->ch.recv(l2->ch.peer, skb); 184 if (ret && (*debug & DEBUG_L2_RECV)) 185 printk(KERN_DEBUG "l2down_skb: dev %s ret(%d)\n", 186 mISDNDevName4ch(&l2->ch), ret); 187 return ret; 188 } 189 190 static int l2down_raw(struct layer2 * l2,struct sk_buff * skb)191 l2down_raw(struct layer2 *l2, struct sk_buff *skb) 192 { 193 struct mISDNhead *hh = mISDN_HEAD_P(skb); 194 195 if (hh->prim == PH_DATA_REQ) { 196 if (test_and_set_bit(FLG_L1_NOTREADY, &l2->flag)) { 197 skb_queue_tail(&l2->down_queue, skb); 198 return 0; 199 } 200 l2->down_id = mISDN_HEAD_ID(skb); 201 } 202 return l2down_skb(l2, skb); 203 } 204 205 static int l2down(struct layer2 * l2,u_int prim,u_int id,struct sk_buff * skb)206 l2down(struct layer2 *l2, u_int prim, u_int id, struct sk_buff *skb) 207 { 208 struct mISDNhead *hh = mISDN_HEAD_P(skb); 209 210 hh->prim = prim; 211 hh->id = id; 212 return l2down_raw(l2, skb); 213 } 214 215 static int l2down_create(struct layer2 * l2,u_int prim,u_int id,int len,void * arg)216 l2down_create(struct layer2 *l2, u_int prim, u_int id, int len, void *arg) 217 { 218 struct sk_buff *skb; 219 int err; 220 struct mISDNhead *hh; 221 222 skb = mI_alloc_skb(len, GFP_ATOMIC); 223 if (!skb) 224 return -ENOMEM; 225 hh = mISDN_HEAD_P(skb); 226 hh->prim = prim; 227 hh->id = id; 228 if (len) 229 skb_put_data(skb, arg, len); 230 err = l2down_raw(l2, skb); 231 if (err) 232 dev_kfree_skb(skb); 233 return err; 234 } 235 236 static int ph_data_confirm(struct layer2 * l2,struct mISDNhead * hh,struct sk_buff * skb)237 ph_data_confirm(struct layer2 *l2, struct mISDNhead *hh, struct sk_buff *skb) { 238 struct sk_buff *nskb = skb; 239 int ret = -EAGAIN; 240 241 if (test_bit(FLG_L1_NOTREADY, &l2->flag)) { 242 if (hh->id == l2->down_id) { 243 nskb = skb_dequeue(&l2->down_queue); 244 if (nskb) { 245 l2->down_id = mISDN_HEAD_ID(nskb); 246 if (l2down_skb(l2, nskb)) { 247 dev_kfree_skb(nskb); 248 l2->down_id = MISDN_ID_NONE; 249 } 250 } else 251 l2->down_id = MISDN_ID_NONE; 252 if (ret) { 253 dev_kfree_skb(skb); 254 ret = 0; 255 } 256 if (l2->down_id == MISDN_ID_NONE) { 257 test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag); 258 mISDN_FsmEvent(&l2->l2m, EV_L2_ACK_PULL, NULL); 259 } 260 } 261 } 262 if (!test_and_set_bit(FLG_L1_NOTREADY, &l2->flag)) { 263 nskb = skb_dequeue(&l2->down_queue); 264 if (nskb) { 265 l2->down_id = mISDN_HEAD_ID(nskb); 266 if (l2down_skb(l2, nskb)) { 267 dev_kfree_skb(nskb); 268 l2->down_id = MISDN_ID_NONE; 269 test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag); 270 } 271 } else 272 test_and_clear_bit(FLG_L1_NOTREADY, &l2->flag); 273 } 274 return ret; 275 } 276 277 static void l2_timeout(struct FsmInst * fi,int event,void * arg)278 l2_timeout(struct FsmInst *fi, int event, void *arg) 279 { 280 struct layer2 *l2 = fi->userdata; 281 struct sk_buff *skb; 282 struct mISDNhead *hh; 283 284 skb = mI_alloc_skb(0, GFP_ATOMIC); 285 if (!skb) { 286 printk(KERN_WARNING "%s: L2(%d,%d) nr:%x timer %s no skb\n", 287 mISDNDevName4ch(&l2->ch), l2->sapi, l2->tei, 288 l2->ch.nr, event == EV_L2_T200 ? "T200" : "T203"); 289 return; 290 } 291 hh = mISDN_HEAD_P(skb); 292 hh->prim = event == EV_L2_T200 ? DL_TIMER200_IND : DL_TIMER203_IND; 293 hh->id = l2->ch.nr; 294 if (*debug & DEBUG_TIMER) 295 printk(KERN_DEBUG "%s: L2(%d,%d) nr:%x timer %s expired\n", 296 mISDNDevName4ch(&l2->ch), l2->sapi, l2->tei, 297 l2->ch.nr, event == EV_L2_T200 ? "T200" : "T203"); 298 if (l2->ch.st) 299 l2->ch.st->own.recv(&l2->ch.st->own, skb); 300 } 301 302 static int l2mgr(struct layer2 * l2,u_int prim,void * arg)303 l2mgr(struct layer2 *l2, u_int prim, void *arg) { 304 long c = (long)arg; 305 306 printk(KERN_WARNING "l2mgr: dev %s addr:%x prim %x %c\n", 307 mISDNDevName4ch(&l2->ch), l2->id, prim, (char)c); 308 if (test_bit(FLG_LAPD, &l2->flag) && 309 !test_bit(FLG_FIXED_TEI, &l2->flag)) { 310 switch (c) { 311 case 'C': 312 case 'D': 313 case 'G': 314 case 'H': 315 l2_tei(l2, prim, (u_long)arg); 316 break; 317 } 318 } 319 return 0; 320 } 321 322 static void set_peer_busy(struct layer2 * l2)323 set_peer_busy(struct layer2 *l2) { 324 test_and_set_bit(FLG_PEER_BUSY, &l2->flag); 325 if (skb_queue_len(&l2->i_queue) || skb_queue_len(&l2->ui_queue)) 326 test_and_set_bit(FLG_L2BLOCK, &l2->flag); 327 } 328 329 static void clear_peer_busy(struct layer2 * l2)330 clear_peer_busy(struct layer2 *l2) { 331 if (test_and_clear_bit(FLG_PEER_BUSY, &l2->flag)) 332 test_and_clear_bit(FLG_L2BLOCK, &l2->flag); 333 } 334 335 static void InitWin(struct layer2 * l2)336 InitWin(struct layer2 *l2) 337 { 338 int i; 339 340 for (i = 0; i < MAX_WINDOW; i++) 341 l2->windowar[i] = NULL; 342 } 343 344 static int freewin(struct layer2 * l2)345 freewin(struct layer2 *l2) 346 { 347 int i, cnt = 0; 348 349 for (i = 0; i < MAX_WINDOW; i++) { 350 if (l2->windowar[i]) { 351 cnt++; 352 dev_kfree_skb(l2->windowar[i]); 353 l2->windowar[i] = NULL; 354 } 355 } 356 return cnt; 357 } 358 359 static void ReleaseWin(struct layer2 * l2)360 ReleaseWin(struct layer2 *l2) 361 { 362 int cnt = freewin(l2); 363 364 if (cnt) 365 printk(KERN_WARNING 366 "isdnl2 freed %d skbuffs in release\n", cnt); 367 } 368 369 inline unsigned int cansend(struct layer2 * l2)370 cansend(struct layer2 *l2) 371 { 372 unsigned int p1; 373 374 if (test_bit(FLG_MOD128, &l2->flag)) 375 p1 = (l2->vs - l2->va) % 128; 376 else 377 p1 = (l2->vs - l2->va) % 8; 378 return (p1 < l2->window) && !test_bit(FLG_PEER_BUSY, &l2->flag); 379 } 380 381 inline void clear_exception(struct layer2 * l2)382 clear_exception(struct layer2 *l2) 383 { 384 test_and_clear_bit(FLG_ACK_PEND, &l2->flag); 385 test_and_clear_bit(FLG_REJEXC, &l2->flag); 386 test_and_clear_bit(FLG_OWN_BUSY, &l2->flag); 387 clear_peer_busy(l2); 388 } 389 390 static int sethdraddr(struct layer2 * l2,u_char * header,int rsp)391 sethdraddr(struct layer2 *l2, u_char *header, int rsp) 392 { 393 u_char *ptr = header; 394 int crbit = rsp; 395 396 if (test_bit(FLG_LAPD, &l2->flag)) { 397 if (test_bit(FLG_LAPD_NET, &l2->flag)) 398 crbit = !crbit; 399 *ptr++ = (l2->sapi << 2) | (crbit ? 2 : 0); 400 *ptr++ = (l2->tei << 1) | 1; 401 return 2; 402 } else { 403 if (test_bit(FLG_ORIG, &l2->flag)) 404 crbit = !crbit; 405 if (crbit) 406 *ptr++ = l2->addr.B; 407 else 408 *ptr++ = l2->addr.A; 409 return 1; 410 } 411 } 412 413 static inline void enqueue_super(struct layer2 * l2,struct sk_buff * skb)414 enqueue_super(struct layer2 *l2, struct sk_buff *skb) 415 { 416 if (l2down(l2, PH_DATA_REQ, l2_newid(l2), skb)) 417 dev_kfree_skb(skb); 418 } 419 420 static inline void enqueue_ui(struct layer2 * l2,struct sk_buff * skb)421 enqueue_ui(struct layer2 *l2, struct sk_buff *skb) 422 { 423 if (l2->tm) 424 l2_tei(l2, MDL_STATUS_UI_IND, 0); 425 if (l2down(l2, PH_DATA_REQ, l2_newid(l2), skb)) 426 dev_kfree_skb(skb); 427 } 428 429 inline int IsUI(u_char * data)430 IsUI(u_char *data) 431 { 432 return (data[0] & 0xef) == UI; 433 } 434 435 inline int IsUA(u_char * data)436 IsUA(u_char *data) 437 { 438 return (data[0] & 0xef) == UA; 439 } 440 441 inline int IsDM(u_char * data)442 IsDM(u_char *data) 443 { 444 return (data[0] & 0xef) == DM; 445 } 446 447 inline int IsDISC(u_char * data)448 IsDISC(u_char *data) 449 { 450 return (data[0] & 0xef) == DISC; 451 } 452 453 inline int IsRR(u_char * data,struct layer2 * l2)454 IsRR(u_char *data, struct layer2 *l2) 455 { 456 if (test_bit(FLG_MOD128, &l2->flag)) 457 return data[0] == RR; 458 else 459 return (data[0] & 0xf) == 1; 460 } 461 462 inline int IsSFrame(u_char * data,struct layer2 * l2)463 IsSFrame(u_char *data, struct layer2 *l2) 464 { 465 register u_char d = *data; 466 467 if (!test_bit(FLG_MOD128, &l2->flag)) 468 d &= 0xf; 469 return ((d & 0xf3) == 1) && ((d & 0x0c) != 0x0c); 470 } 471 472 inline int IsSABME(u_char * data,struct layer2 * l2)473 IsSABME(u_char *data, struct layer2 *l2) 474 { 475 u_char d = data[0] & ~0x10; 476 477 return test_bit(FLG_MOD128, &l2->flag) ? d == SABME : d == SABM; 478 } 479 480 inline int IsREJ(u_char * data,struct layer2 * l2)481 IsREJ(u_char *data, struct layer2 *l2) 482 { 483 return test_bit(FLG_MOD128, &l2->flag) ? 484 data[0] == REJ : (data[0] & 0xf) == REJ; 485 } 486 487 inline int IsFRMR(u_char * data)488 IsFRMR(u_char *data) 489 { 490 return (data[0] & 0xef) == FRMR; 491 } 492 493 inline int IsRNR(u_char * data,struct layer2 * l2)494 IsRNR(u_char *data, struct layer2 *l2) 495 { 496 return test_bit(FLG_MOD128, &l2->flag) ? 497 data[0] == RNR : (data[0] & 0xf) == RNR; 498 } 499 500 static int iframe_error(struct layer2 * l2,struct sk_buff * skb)501 iframe_error(struct layer2 *l2, struct sk_buff *skb) 502 { 503 u_int i; 504 int rsp = *skb->data & 0x2; 505 506 i = l2addrsize(l2) + (test_bit(FLG_MOD128, &l2->flag) ? 2 : 1); 507 if (test_bit(FLG_ORIG, &l2->flag)) 508 rsp = !rsp; 509 if (rsp) 510 return 'L'; 511 if (skb->len < i) 512 return 'N'; 513 if ((skb->len - i) > l2->maxlen) 514 return 'O'; 515 return 0; 516 } 517 518 static int super_error(struct layer2 * l2,struct sk_buff * skb)519 super_error(struct layer2 *l2, struct sk_buff *skb) 520 { 521 if (skb->len != l2addrsize(l2) + 522 (test_bit(FLG_MOD128, &l2->flag) ? 2 : 1)) 523 return 'N'; 524 return 0; 525 } 526 527 static int unnum_error(struct layer2 * l2,struct sk_buff * skb,int wantrsp)528 unnum_error(struct layer2 *l2, struct sk_buff *skb, int wantrsp) 529 { 530 int rsp = (*skb->data & 0x2) >> 1; 531 if (test_bit(FLG_ORIG, &l2->flag)) 532 rsp = !rsp; 533 if (rsp != wantrsp) 534 return 'L'; 535 if (skb->len != l2addrsize(l2) + 1) 536 return 'N'; 537 return 0; 538 } 539 540 static int UI_error(struct layer2 * l2,struct sk_buff * skb)541 UI_error(struct layer2 *l2, struct sk_buff *skb) 542 { 543 int rsp = *skb->data & 0x2; 544 if (test_bit(FLG_ORIG, &l2->flag)) 545 rsp = !rsp; 546 if (rsp) 547 return 'L'; 548 if (skb->len > l2->maxlen + l2addrsize(l2) + 1) 549 return 'O'; 550 return 0; 551 } 552 553 static int FRMR_error(struct layer2 * l2,struct sk_buff * skb)554 FRMR_error(struct layer2 *l2, struct sk_buff *skb) 555 { 556 u_int headers = l2addrsize(l2) + 1; 557 u_char *datap = skb->data + headers; 558 int rsp = *skb->data & 0x2; 559 560 if (test_bit(FLG_ORIG, &l2->flag)) 561 rsp = !rsp; 562 if (!rsp) 563 return 'L'; 564 if (test_bit(FLG_MOD128, &l2->flag)) { 565 if (skb->len < headers + 5) 566 return 'N'; 567 else if (*debug & DEBUG_L2) 568 l2m_debug(&l2->l2m, 569 "FRMR information %2x %2x %2x %2x %2x", 570 datap[0], datap[1], datap[2], datap[3], datap[4]); 571 } else { 572 if (skb->len < headers + 3) 573 return 'N'; 574 else if (*debug & DEBUG_L2) 575 l2m_debug(&l2->l2m, 576 "FRMR information %2x %2x %2x", 577 datap[0], datap[1], datap[2]); 578 } 579 return 0; 580 } 581 582 static unsigned int legalnr(struct layer2 * l2,unsigned int nr)583 legalnr(struct layer2 *l2, unsigned int nr) 584 { 585 if (test_bit(FLG_MOD128, &l2->flag)) 586 return ((nr - l2->va) % 128) <= ((l2->vs - l2->va) % 128); 587 else 588 return ((nr - l2->va) % 8) <= ((l2->vs - l2->va) % 8); 589 } 590 591 static void setva(struct layer2 * l2,unsigned int nr)592 setva(struct layer2 *l2, unsigned int nr) 593 { 594 struct sk_buff *skb; 595 596 while (l2->va != nr) { 597 l2->va++; 598 if (test_bit(FLG_MOD128, &l2->flag)) 599 l2->va %= 128; 600 else 601 l2->va %= 8; 602 if (l2->windowar[l2->sow]) { 603 skb_trim(l2->windowar[l2->sow], 0); 604 skb_queue_tail(&l2->tmp_queue, l2->windowar[l2->sow]); 605 l2->windowar[l2->sow] = NULL; 606 } 607 l2->sow = (l2->sow + 1) % l2->window; 608 } 609 skb = skb_dequeue(&l2->tmp_queue); 610 while (skb) { 611 dev_kfree_skb(skb); 612 skb = skb_dequeue(&l2->tmp_queue); 613 } 614 } 615 616 static void send_uframe(struct layer2 * l2,struct sk_buff * skb,u_char cmd,u_char cr)617 send_uframe(struct layer2 *l2, struct sk_buff *skb, u_char cmd, u_char cr) 618 { 619 u_char tmp[MAX_L2HEADER_LEN]; 620 int i; 621 622 i = sethdraddr(l2, tmp, cr); 623 tmp[i++] = cmd; 624 if (skb) 625 skb_trim(skb, 0); 626 else { 627 skb = mI_alloc_skb(i, GFP_ATOMIC); 628 if (!skb) { 629 printk(KERN_WARNING "%s: can't alloc skbuff in %s\n", 630 mISDNDevName4ch(&l2->ch), __func__); 631 return; 632 } 633 } 634 skb_put_data(skb, tmp, i); 635 enqueue_super(l2, skb); 636 } 637 638 639 inline u_char get_PollFlag(struct layer2 * l2,struct sk_buff * skb)640 get_PollFlag(struct layer2 *l2, struct sk_buff *skb) 641 { 642 return skb->data[l2addrsize(l2)] & 0x10; 643 } 644 645 inline u_char get_PollFlagFree(struct layer2 * l2,struct sk_buff * skb)646 get_PollFlagFree(struct layer2 *l2, struct sk_buff *skb) 647 { 648 u_char PF; 649 650 PF = get_PollFlag(l2, skb); 651 dev_kfree_skb(skb); 652 return PF; 653 } 654 655 inline void start_t200(struct layer2 * l2,int i)656 start_t200(struct layer2 *l2, int i) 657 { 658 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, i); 659 test_and_set_bit(FLG_T200_RUN, &l2->flag); 660 } 661 662 inline void restart_t200(struct layer2 * l2,int i)663 restart_t200(struct layer2 *l2, int i) 664 { 665 mISDN_FsmRestartTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, i); 666 test_and_set_bit(FLG_T200_RUN, &l2->flag); 667 } 668 669 inline void stop_t200(struct layer2 * l2,int i)670 stop_t200(struct layer2 *l2, int i) 671 { 672 if (test_and_clear_bit(FLG_T200_RUN, &l2->flag)) 673 mISDN_FsmDelTimer(&l2->t200, i); 674 } 675 676 inline void st5_dl_release_l2l3(struct layer2 * l2)677 st5_dl_release_l2l3(struct layer2 *l2) 678 { 679 int pr; 680 681 if (test_and_clear_bit(FLG_PEND_REL, &l2->flag)) 682 pr = DL_RELEASE_CNF; 683 else 684 pr = DL_RELEASE_IND; 685 l2up_create(l2, pr, 0, NULL); 686 } 687 688 inline void lapb_dl_release_l2l3(struct layer2 * l2,int f)689 lapb_dl_release_l2l3(struct layer2 *l2, int f) 690 { 691 if (test_bit(FLG_LAPB, &l2->flag)) 692 l2down_create(l2, PH_DEACTIVATE_REQ, l2_newid(l2), 0, NULL); 693 l2up_create(l2, f, 0, NULL); 694 } 695 696 static void establishlink(struct FsmInst * fi)697 establishlink(struct FsmInst *fi) 698 { 699 struct layer2 *l2 = fi->userdata; 700 u_char cmd; 701 702 clear_exception(l2); 703 l2->rc = 0; 704 cmd = (test_bit(FLG_MOD128, &l2->flag) ? SABME : SABM) | 0x10; 705 send_uframe(l2, NULL, cmd, CMD); 706 mISDN_FsmDelTimer(&l2->t203, 1); 707 restart_t200(l2, 1); 708 test_and_clear_bit(FLG_PEND_REL, &l2->flag); 709 freewin(l2); 710 mISDN_FsmChangeState(fi, ST_L2_5); 711 } 712 713 static void l2_mdl_error_ua(struct FsmInst * fi,int event,void * arg)714 l2_mdl_error_ua(struct FsmInst *fi, int event, void *arg) 715 { 716 struct sk_buff *skb = arg; 717 struct layer2 *l2 = fi->userdata; 718 719 if (get_PollFlagFree(l2, skb)) 720 l2mgr(l2, MDL_ERROR_IND, (void *) 'C'); 721 else 722 l2mgr(l2, MDL_ERROR_IND, (void *) 'D'); 723 724 } 725 726 static void l2_mdl_error_dm(struct FsmInst * fi,int event,void * arg)727 l2_mdl_error_dm(struct FsmInst *fi, int event, void *arg) 728 { 729 struct sk_buff *skb = arg; 730 struct layer2 *l2 = fi->userdata; 731 732 if (get_PollFlagFree(l2, skb)) 733 l2mgr(l2, MDL_ERROR_IND, (void *) 'B'); 734 else { 735 l2mgr(l2, MDL_ERROR_IND, (void *) 'E'); 736 establishlink(fi); 737 test_and_clear_bit(FLG_L3_INIT, &l2->flag); 738 } 739 } 740 741 static void l2_st8_mdl_error_dm(struct FsmInst * fi,int event,void * arg)742 l2_st8_mdl_error_dm(struct FsmInst *fi, int event, void *arg) 743 { 744 struct sk_buff *skb = arg; 745 struct layer2 *l2 = fi->userdata; 746 747 if (get_PollFlagFree(l2, skb)) 748 l2mgr(l2, MDL_ERROR_IND, (void *) 'B'); 749 else 750 l2mgr(l2, MDL_ERROR_IND, (void *) 'E'); 751 establishlink(fi); 752 test_and_clear_bit(FLG_L3_INIT, &l2->flag); 753 } 754 755 static void l2_go_st3(struct FsmInst * fi,int event,void * arg)756 l2_go_st3(struct FsmInst *fi, int event, void *arg) 757 { 758 dev_kfree_skb((struct sk_buff *)arg); 759 mISDN_FsmChangeState(fi, ST_L2_3); 760 } 761 762 static void l2_mdl_assign(struct FsmInst * fi,int event,void * arg)763 l2_mdl_assign(struct FsmInst *fi, int event, void *arg) 764 { 765 struct layer2 *l2 = fi->userdata; 766 767 mISDN_FsmChangeState(fi, ST_L2_3); 768 dev_kfree_skb((struct sk_buff *)arg); 769 l2_tei(l2, MDL_ASSIGN_IND, 0); 770 } 771 772 static void l2_queue_ui_assign(struct FsmInst * fi,int event,void * arg)773 l2_queue_ui_assign(struct FsmInst *fi, int event, void *arg) 774 { 775 struct layer2 *l2 = fi->userdata; 776 struct sk_buff *skb = arg; 777 778 skb_queue_tail(&l2->ui_queue, skb); 779 mISDN_FsmChangeState(fi, ST_L2_2); 780 l2_tei(l2, MDL_ASSIGN_IND, 0); 781 } 782 783 static void l2_queue_ui(struct FsmInst * fi,int event,void * arg)784 l2_queue_ui(struct FsmInst *fi, int event, void *arg) 785 { 786 struct layer2 *l2 = fi->userdata; 787 struct sk_buff *skb = arg; 788 789 skb_queue_tail(&l2->ui_queue, skb); 790 } 791 792 static void tx_ui(struct layer2 * l2)793 tx_ui(struct layer2 *l2) 794 { 795 struct sk_buff *skb; 796 u_char header[MAX_L2HEADER_LEN]; 797 int i; 798 799 i = sethdraddr(l2, header, CMD); 800 if (test_bit(FLG_LAPD_NET, &l2->flag)) 801 header[1] = 0xff; /* tei 127 */ 802 header[i++] = UI; 803 while ((skb = skb_dequeue(&l2->ui_queue))) { 804 memcpy(skb_push(skb, i), header, i); 805 enqueue_ui(l2, skb); 806 } 807 } 808 809 static void l2_send_ui(struct FsmInst * fi,int event,void * arg)810 l2_send_ui(struct FsmInst *fi, int event, void *arg) 811 { 812 struct layer2 *l2 = fi->userdata; 813 struct sk_buff *skb = arg; 814 815 skb_queue_tail(&l2->ui_queue, skb); 816 tx_ui(l2); 817 } 818 819 static void l2_got_ui(struct FsmInst * fi,int event,void * arg)820 l2_got_ui(struct FsmInst *fi, int event, void *arg) 821 { 822 struct layer2 *l2 = fi->userdata; 823 struct sk_buff *skb = arg; 824 825 skb_pull(skb, l2headersize(l2, 1)); 826 /* 827 * in states 1-3 for broadcast 828 */ 829 830 if (l2->tm) 831 l2_tei(l2, MDL_STATUS_UI_IND, 0); 832 l2up(l2, DL_UNITDATA_IND, skb); 833 } 834 835 static void l2_establish(struct FsmInst * fi,int event,void * arg)836 l2_establish(struct FsmInst *fi, int event, void *arg) 837 { 838 struct sk_buff *skb = arg; 839 struct layer2 *l2 = fi->userdata; 840 841 establishlink(fi); 842 test_and_set_bit(FLG_L3_INIT, &l2->flag); 843 dev_kfree_skb(skb); 844 } 845 846 static void l2_discard_i_setl3(struct FsmInst * fi,int event,void * arg)847 l2_discard_i_setl3(struct FsmInst *fi, int event, void *arg) 848 { 849 struct sk_buff *skb = arg; 850 struct layer2 *l2 = fi->userdata; 851 852 skb_queue_purge(&l2->i_queue); 853 test_and_set_bit(FLG_L3_INIT, &l2->flag); 854 test_and_clear_bit(FLG_PEND_REL, &l2->flag); 855 dev_kfree_skb(skb); 856 } 857 858 static void l2_l3_reestablish(struct FsmInst * fi,int event,void * arg)859 l2_l3_reestablish(struct FsmInst *fi, int event, void *arg) 860 { 861 struct sk_buff *skb = arg; 862 struct layer2 *l2 = fi->userdata; 863 864 skb_queue_purge(&l2->i_queue); 865 establishlink(fi); 866 test_and_set_bit(FLG_L3_INIT, &l2->flag); 867 dev_kfree_skb(skb); 868 } 869 870 static void l2_release(struct FsmInst * fi,int event,void * arg)871 l2_release(struct FsmInst *fi, int event, void *arg) 872 { 873 struct layer2 *l2 = fi->userdata; 874 struct sk_buff *skb = arg; 875 876 skb_trim(skb, 0); 877 l2up(l2, DL_RELEASE_CNF, skb); 878 } 879 880 static void l2_pend_rel(struct FsmInst * fi,int event,void * arg)881 l2_pend_rel(struct FsmInst *fi, int event, void *arg) 882 { 883 struct sk_buff *skb = arg; 884 struct layer2 *l2 = fi->userdata; 885 886 test_and_set_bit(FLG_PEND_REL, &l2->flag); 887 dev_kfree_skb(skb); 888 } 889 890 static void l2_disconnect(struct FsmInst * fi,int event,void * arg)891 l2_disconnect(struct FsmInst *fi, int event, void *arg) 892 { 893 struct layer2 *l2 = fi->userdata; 894 struct sk_buff *skb = arg; 895 896 skb_queue_purge(&l2->i_queue); 897 freewin(l2); 898 mISDN_FsmChangeState(fi, ST_L2_6); 899 l2->rc = 0; 900 send_uframe(l2, NULL, DISC | 0x10, CMD); 901 mISDN_FsmDelTimer(&l2->t203, 1); 902 restart_t200(l2, 2); 903 dev_kfree_skb(skb); 904 } 905 906 static void l2_start_multi(struct FsmInst * fi,int event,void * arg)907 l2_start_multi(struct FsmInst *fi, int event, void *arg) 908 { 909 struct layer2 *l2 = fi->userdata; 910 struct sk_buff *skb = arg; 911 912 l2->vs = 0; 913 l2->va = 0; 914 l2->vr = 0; 915 l2->sow = 0; 916 clear_exception(l2); 917 send_uframe(l2, NULL, UA | get_PollFlag(l2, skb), RSP); 918 mISDN_FsmChangeState(fi, ST_L2_7); 919 mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 3); 920 skb_trim(skb, 0); 921 l2up(l2, DL_ESTABLISH_IND, skb); 922 if (l2->tm) 923 l2_tei(l2, MDL_STATUS_UP_IND, 0); 924 } 925 926 static void l2_send_UA(struct FsmInst * fi,int event,void * arg)927 l2_send_UA(struct FsmInst *fi, int event, void *arg) 928 { 929 struct layer2 *l2 = fi->userdata; 930 struct sk_buff *skb = arg; 931 932 send_uframe(l2, skb, UA | get_PollFlag(l2, skb), RSP); 933 } 934 935 static void l2_send_DM(struct FsmInst * fi,int event,void * arg)936 l2_send_DM(struct FsmInst *fi, int event, void *arg) 937 { 938 struct layer2 *l2 = fi->userdata; 939 struct sk_buff *skb = arg; 940 941 send_uframe(l2, skb, DM | get_PollFlag(l2, skb), RSP); 942 } 943 944 static void l2_restart_multi(struct FsmInst * fi,int event,void * arg)945 l2_restart_multi(struct FsmInst *fi, int event, void *arg) 946 { 947 struct layer2 *l2 = fi->userdata; 948 struct sk_buff *skb = arg; 949 int est = 0; 950 951 send_uframe(l2, skb, UA | get_PollFlag(l2, skb), RSP); 952 953 l2mgr(l2, MDL_ERROR_IND, (void *) 'F'); 954 955 if (l2->vs != l2->va) { 956 skb_queue_purge(&l2->i_queue); 957 est = 1; 958 } 959 960 clear_exception(l2); 961 l2->vs = 0; 962 l2->va = 0; 963 l2->vr = 0; 964 l2->sow = 0; 965 mISDN_FsmChangeState(fi, ST_L2_7); 966 stop_t200(l2, 3); 967 mISDN_FsmRestartTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 3); 968 969 if (est) 970 l2up_create(l2, DL_ESTABLISH_IND, 0, NULL); 971 /* mISDN_queue_data(&l2->inst, l2->inst.id | MSG_BROADCAST, 972 * MGR_SHORTSTATUS | INDICATION, SSTATUS_L2_ESTABLISHED, 973 * 0, NULL, 0); 974 */ 975 if (skb_queue_len(&l2->i_queue) && cansend(l2)) 976 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL); 977 } 978 979 static void l2_stop_multi(struct FsmInst * fi,int event,void * arg)980 l2_stop_multi(struct FsmInst *fi, int event, void *arg) 981 { 982 struct layer2 *l2 = fi->userdata; 983 struct sk_buff *skb = arg; 984 985 mISDN_FsmChangeState(fi, ST_L2_4); 986 mISDN_FsmDelTimer(&l2->t203, 3); 987 stop_t200(l2, 4); 988 989 send_uframe(l2, skb, UA | get_PollFlag(l2, skb), RSP); 990 skb_queue_purge(&l2->i_queue); 991 freewin(l2); 992 lapb_dl_release_l2l3(l2, DL_RELEASE_IND); 993 if (l2->tm) 994 l2_tei(l2, MDL_STATUS_DOWN_IND, 0); 995 } 996 997 static void l2_connected(struct FsmInst * fi,int event,void * arg)998 l2_connected(struct FsmInst *fi, int event, void *arg) 999 { 1000 struct layer2 *l2 = fi->userdata; 1001 struct sk_buff *skb = arg; 1002 int pr = -1; 1003 1004 if (!get_PollFlag(l2, skb)) { 1005 l2_mdl_error_ua(fi, event, arg); 1006 return; 1007 } 1008 dev_kfree_skb(skb); 1009 if (test_and_clear_bit(FLG_PEND_REL, &l2->flag)) 1010 l2_disconnect(fi, event, NULL); 1011 if (test_and_clear_bit(FLG_L3_INIT, &l2->flag)) { 1012 pr = DL_ESTABLISH_CNF; 1013 } else if (l2->vs != l2->va) { 1014 skb_queue_purge(&l2->i_queue); 1015 pr = DL_ESTABLISH_IND; 1016 } 1017 stop_t200(l2, 5); 1018 l2->vr = 0; 1019 l2->vs = 0; 1020 l2->va = 0; 1021 l2->sow = 0; 1022 mISDN_FsmChangeState(fi, ST_L2_7); 1023 mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 4); 1024 if (pr != -1) 1025 l2up_create(l2, pr, 0, NULL); 1026 1027 if (skb_queue_len(&l2->i_queue) && cansend(l2)) 1028 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL); 1029 1030 if (l2->tm) 1031 l2_tei(l2, MDL_STATUS_UP_IND, 0); 1032 } 1033 1034 static void l2_released(struct FsmInst * fi,int event,void * arg)1035 l2_released(struct FsmInst *fi, int event, void *arg) 1036 { 1037 struct layer2 *l2 = fi->userdata; 1038 struct sk_buff *skb = arg; 1039 1040 if (!get_PollFlag(l2, skb)) { 1041 l2_mdl_error_ua(fi, event, arg); 1042 return; 1043 } 1044 dev_kfree_skb(skb); 1045 stop_t200(l2, 6); 1046 lapb_dl_release_l2l3(l2, DL_RELEASE_CNF); 1047 mISDN_FsmChangeState(fi, ST_L2_4); 1048 if (l2->tm) 1049 l2_tei(l2, MDL_STATUS_DOWN_IND, 0); 1050 } 1051 1052 static void l2_reestablish(struct FsmInst * fi,int event,void * arg)1053 l2_reestablish(struct FsmInst *fi, int event, void *arg) 1054 { 1055 struct layer2 *l2 = fi->userdata; 1056 struct sk_buff *skb = arg; 1057 1058 if (!get_PollFlagFree(l2, skb)) { 1059 establishlink(fi); 1060 test_and_set_bit(FLG_L3_INIT, &l2->flag); 1061 } 1062 } 1063 1064 static void l2_st5_dm_release(struct FsmInst * fi,int event,void * arg)1065 l2_st5_dm_release(struct FsmInst *fi, int event, void *arg) 1066 { 1067 struct layer2 *l2 = fi->userdata; 1068 struct sk_buff *skb = arg; 1069 1070 if (get_PollFlagFree(l2, skb)) { 1071 stop_t200(l2, 7); 1072 if (!test_bit(FLG_L3_INIT, &l2->flag)) 1073 skb_queue_purge(&l2->i_queue); 1074 if (test_bit(FLG_LAPB, &l2->flag)) 1075 l2down_create(l2, PH_DEACTIVATE_REQ, 1076 l2_newid(l2), 0, NULL); 1077 st5_dl_release_l2l3(l2); 1078 mISDN_FsmChangeState(fi, ST_L2_4); 1079 if (l2->tm) 1080 l2_tei(l2, MDL_STATUS_DOWN_IND, 0); 1081 } 1082 } 1083 1084 static void l2_st6_dm_release(struct FsmInst * fi,int event,void * arg)1085 l2_st6_dm_release(struct FsmInst *fi, int event, void *arg) 1086 { 1087 struct layer2 *l2 = fi->userdata; 1088 struct sk_buff *skb = arg; 1089 1090 if (get_PollFlagFree(l2, skb)) { 1091 stop_t200(l2, 8); 1092 lapb_dl_release_l2l3(l2, DL_RELEASE_CNF); 1093 mISDN_FsmChangeState(fi, ST_L2_4); 1094 if (l2->tm) 1095 l2_tei(l2, MDL_STATUS_DOWN_IND, 0); 1096 } 1097 } 1098 1099 static void enquiry_cr(struct layer2 * l2,u_char typ,u_char cr,u_char pf)1100 enquiry_cr(struct layer2 *l2, u_char typ, u_char cr, u_char pf) 1101 { 1102 struct sk_buff *skb; 1103 u_char tmp[MAX_L2HEADER_LEN]; 1104 int i; 1105 1106 i = sethdraddr(l2, tmp, cr); 1107 if (test_bit(FLG_MOD128, &l2->flag)) { 1108 tmp[i++] = typ; 1109 tmp[i++] = (l2->vr << 1) | (pf ? 1 : 0); 1110 } else 1111 tmp[i++] = (l2->vr << 5) | typ | (pf ? 0x10 : 0); 1112 skb = mI_alloc_skb(i, GFP_ATOMIC); 1113 if (!skb) { 1114 printk(KERN_WARNING "%s: isdnl2 can't alloc sbbuff in %s\n", 1115 mISDNDevName4ch(&l2->ch), __func__); 1116 return; 1117 } 1118 skb_put_data(skb, tmp, i); 1119 enqueue_super(l2, skb); 1120 } 1121 1122 inline void enquiry_response(struct layer2 * l2)1123 enquiry_response(struct layer2 *l2) 1124 { 1125 if (test_bit(FLG_OWN_BUSY, &l2->flag)) 1126 enquiry_cr(l2, RNR, RSP, 1); 1127 else 1128 enquiry_cr(l2, RR, RSP, 1); 1129 test_and_clear_bit(FLG_ACK_PEND, &l2->flag); 1130 } 1131 1132 inline void transmit_enquiry(struct layer2 * l2)1133 transmit_enquiry(struct layer2 *l2) 1134 { 1135 if (test_bit(FLG_OWN_BUSY, &l2->flag)) 1136 enquiry_cr(l2, RNR, CMD, 1); 1137 else 1138 enquiry_cr(l2, RR, CMD, 1); 1139 test_and_clear_bit(FLG_ACK_PEND, &l2->flag); 1140 start_t200(l2, 9); 1141 } 1142 1143 1144 static void nrerrorrecovery(struct FsmInst * fi)1145 nrerrorrecovery(struct FsmInst *fi) 1146 { 1147 struct layer2 *l2 = fi->userdata; 1148 1149 l2mgr(l2, MDL_ERROR_IND, (void *) 'J'); 1150 establishlink(fi); 1151 test_and_clear_bit(FLG_L3_INIT, &l2->flag); 1152 } 1153 1154 static void invoke_retransmission(struct layer2 * l2,unsigned int nr)1155 invoke_retransmission(struct layer2 *l2, unsigned int nr) 1156 { 1157 u_int p1; 1158 1159 if (l2->vs != nr) { 1160 while (l2->vs != nr) { 1161 (l2->vs)--; 1162 if (test_bit(FLG_MOD128, &l2->flag)) { 1163 l2->vs %= 128; 1164 p1 = (l2->vs - l2->va) % 128; 1165 } else { 1166 l2->vs %= 8; 1167 p1 = (l2->vs - l2->va) % 8; 1168 } 1169 p1 = (p1 + l2->sow) % l2->window; 1170 if (l2->windowar[p1]) 1171 skb_queue_head(&l2->i_queue, l2->windowar[p1]); 1172 else 1173 printk(KERN_WARNING 1174 "%s: windowar[%d] is NULL\n", 1175 mISDNDevName4ch(&l2->ch), p1); 1176 l2->windowar[p1] = NULL; 1177 } 1178 mISDN_FsmEvent(&l2->l2m, EV_L2_ACK_PULL, NULL); 1179 } 1180 } 1181 1182 static void l2_st7_got_super(struct FsmInst * fi,int event,void * arg)1183 l2_st7_got_super(struct FsmInst *fi, int event, void *arg) 1184 { 1185 struct layer2 *l2 = fi->userdata; 1186 struct sk_buff *skb = arg; 1187 int PollFlag, rsp, typ = RR; 1188 unsigned int nr; 1189 1190 rsp = *skb->data & 0x2; 1191 if (test_bit(FLG_ORIG, &l2->flag)) 1192 rsp = !rsp; 1193 1194 skb_pull(skb, l2addrsize(l2)); 1195 if (IsRNR(skb->data, l2)) { 1196 set_peer_busy(l2); 1197 typ = RNR; 1198 } else 1199 clear_peer_busy(l2); 1200 if (IsREJ(skb->data, l2)) 1201 typ = REJ; 1202 1203 if (test_bit(FLG_MOD128, &l2->flag)) { 1204 PollFlag = (skb->data[1] & 0x1) == 0x1; 1205 nr = skb->data[1] >> 1; 1206 } else { 1207 PollFlag = (skb->data[0] & 0x10); 1208 nr = (skb->data[0] >> 5) & 0x7; 1209 } 1210 dev_kfree_skb(skb); 1211 1212 if (PollFlag) { 1213 if (rsp) 1214 l2mgr(l2, MDL_ERROR_IND, (void *) 'A'); 1215 else 1216 enquiry_response(l2); 1217 } 1218 if (legalnr(l2, nr)) { 1219 if (typ == REJ) { 1220 setva(l2, nr); 1221 invoke_retransmission(l2, nr); 1222 stop_t200(l2, 10); 1223 if (mISDN_FsmAddTimer(&l2->t203, l2->T203, 1224 EV_L2_T203, NULL, 6)) 1225 l2m_debug(&l2->l2m, "Restart T203 ST7 REJ"); 1226 } else if ((nr == l2->vs) && (typ == RR)) { 1227 setva(l2, nr); 1228 stop_t200(l2, 11); 1229 mISDN_FsmRestartTimer(&l2->t203, l2->T203, 1230 EV_L2_T203, NULL, 7); 1231 } else if ((l2->va != nr) || (typ == RNR)) { 1232 setva(l2, nr); 1233 if (typ != RR) 1234 mISDN_FsmDelTimer(&l2->t203, 9); 1235 restart_t200(l2, 12); 1236 } 1237 if (skb_queue_len(&l2->i_queue) && (typ == RR)) 1238 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL); 1239 } else 1240 nrerrorrecovery(fi); 1241 } 1242 1243 static void l2_feed_i_if_reest(struct FsmInst * fi,int event,void * arg)1244 l2_feed_i_if_reest(struct FsmInst *fi, int event, void *arg) 1245 { 1246 struct layer2 *l2 = fi->userdata; 1247 struct sk_buff *skb = arg; 1248 1249 if (!test_bit(FLG_L3_INIT, &l2->flag)) 1250 skb_queue_tail(&l2->i_queue, skb); 1251 else 1252 dev_kfree_skb(skb); 1253 } 1254 1255 static void l2_feed_i_pull(struct FsmInst * fi,int event,void * arg)1256 l2_feed_i_pull(struct FsmInst *fi, int event, void *arg) 1257 { 1258 struct layer2 *l2 = fi->userdata; 1259 struct sk_buff *skb = arg; 1260 1261 skb_queue_tail(&l2->i_queue, skb); 1262 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL); 1263 } 1264 1265 static void l2_feed_iqueue(struct FsmInst * fi,int event,void * arg)1266 l2_feed_iqueue(struct FsmInst *fi, int event, void *arg) 1267 { 1268 struct layer2 *l2 = fi->userdata; 1269 struct sk_buff *skb = arg; 1270 1271 skb_queue_tail(&l2->i_queue, skb); 1272 } 1273 1274 static void l2_got_iframe(struct FsmInst * fi,int event,void * arg)1275 l2_got_iframe(struct FsmInst *fi, int event, void *arg) 1276 { 1277 struct layer2 *l2 = fi->userdata; 1278 struct sk_buff *skb = arg; 1279 int PollFlag, i; 1280 u_int ns, nr; 1281 1282 i = l2addrsize(l2); 1283 if (test_bit(FLG_MOD128, &l2->flag)) { 1284 PollFlag = ((skb->data[i + 1] & 0x1) == 0x1); 1285 ns = skb->data[i] >> 1; 1286 nr = (skb->data[i + 1] >> 1) & 0x7f; 1287 } else { 1288 PollFlag = (skb->data[i] & 0x10); 1289 ns = (skb->data[i] >> 1) & 0x7; 1290 nr = (skb->data[i] >> 5) & 0x7; 1291 } 1292 if (test_bit(FLG_OWN_BUSY, &l2->flag)) { 1293 dev_kfree_skb(skb); 1294 if (PollFlag) 1295 enquiry_response(l2); 1296 } else { 1297 if (l2->vr == ns) { 1298 l2->vr++; 1299 if (test_bit(FLG_MOD128, &l2->flag)) 1300 l2->vr %= 128; 1301 else 1302 l2->vr %= 8; 1303 test_and_clear_bit(FLG_REJEXC, &l2->flag); 1304 if (PollFlag) 1305 enquiry_response(l2); 1306 else 1307 test_and_set_bit(FLG_ACK_PEND, &l2->flag); 1308 skb_pull(skb, l2headersize(l2, 0)); 1309 l2up(l2, DL_DATA_IND, skb); 1310 } else { 1311 /* n(s)!=v(r) */ 1312 dev_kfree_skb(skb); 1313 if (test_and_set_bit(FLG_REJEXC, &l2->flag)) { 1314 if (PollFlag) 1315 enquiry_response(l2); 1316 } else { 1317 enquiry_cr(l2, REJ, RSP, PollFlag); 1318 test_and_clear_bit(FLG_ACK_PEND, &l2->flag); 1319 } 1320 } 1321 } 1322 if (legalnr(l2, nr)) { 1323 if (!test_bit(FLG_PEER_BUSY, &l2->flag) && 1324 (fi->state == ST_L2_7)) { 1325 if (nr == l2->vs) { 1326 stop_t200(l2, 13); 1327 mISDN_FsmRestartTimer(&l2->t203, l2->T203, 1328 EV_L2_T203, NULL, 7); 1329 } else if (nr != l2->va) 1330 restart_t200(l2, 14); 1331 } 1332 setva(l2, nr); 1333 } else { 1334 nrerrorrecovery(fi); 1335 return; 1336 } 1337 if (skb_queue_len(&l2->i_queue) && (fi->state == ST_L2_7)) 1338 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL); 1339 if (test_and_clear_bit(FLG_ACK_PEND, &l2->flag)) 1340 enquiry_cr(l2, RR, RSP, 0); 1341 } 1342 1343 static void l2_got_tei(struct FsmInst * fi,int event,void * arg)1344 l2_got_tei(struct FsmInst *fi, int event, void *arg) 1345 { 1346 struct layer2 *l2 = fi->userdata; 1347 u_int info; 1348 1349 l2->tei = (signed char)(long)arg; 1350 set_channel_address(&l2->ch, l2->sapi, l2->tei); 1351 info = DL_INFO_L2_CONNECT; 1352 l2up_create(l2, DL_INFORMATION_IND, sizeof(info), &info); 1353 if (fi->state == ST_L2_3) { 1354 establishlink(fi); 1355 test_and_set_bit(FLG_L3_INIT, &l2->flag); 1356 } else 1357 mISDN_FsmChangeState(fi, ST_L2_4); 1358 if (skb_queue_len(&l2->ui_queue)) 1359 tx_ui(l2); 1360 } 1361 1362 static void l2_st5_tout_200(struct FsmInst * fi,int event,void * arg)1363 l2_st5_tout_200(struct FsmInst *fi, int event, void *arg) 1364 { 1365 struct layer2 *l2 = fi->userdata; 1366 1367 if (test_bit(FLG_LAPD, &l2->flag) && 1368 test_bit(FLG_DCHAN_BUSY, &l2->flag)) { 1369 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9); 1370 } else if (l2->rc == l2->N200) { 1371 mISDN_FsmChangeState(fi, ST_L2_4); 1372 test_and_clear_bit(FLG_T200_RUN, &l2->flag); 1373 skb_queue_purge(&l2->i_queue); 1374 l2mgr(l2, MDL_ERROR_IND, (void *) 'G'); 1375 if (test_bit(FLG_LAPB, &l2->flag)) 1376 l2down_create(l2, PH_DEACTIVATE_REQ, 1377 l2_newid(l2), 0, NULL); 1378 st5_dl_release_l2l3(l2); 1379 if (l2->tm) 1380 l2_tei(l2, MDL_STATUS_DOWN_IND, 0); 1381 } else { 1382 l2->rc++; 1383 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9); 1384 send_uframe(l2, NULL, (test_bit(FLG_MOD128, &l2->flag) ? 1385 SABME : SABM) | 0x10, CMD); 1386 } 1387 } 1388 1389 static void l2_st6_tout_200(struct FsmInst * fi,int event,void * arg)1390 l2_st6_tout_200(struct FsmInst *fi, int event, void *arg) 1391 { 1392 struct layer2 *l2 = fi->userdata; 1393 1394 if (test_bit(FLG_LAPD, &l2->flag) && 1395 test_bit(FLG_DCHAN_BUSY, &l2->flag)) { 1396 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9); 1397 } else if (l2->rc == l2->N200) { 1398 mISDN_FsmChangeState(fi, ST_L2_4); 1399 test_and_clear_bit(FLG_T200_RUN, &l2->flag); 1400 l2mgr(l2, MDL_ERROR_IND, (void *) 'H'); 1401 lapb_dl_release_l2l3(l2, DL_RELEASE_CNF); 1402 if (l2->tm) 1403 l2_tei(l2, MDL_STATUS_DOWN_IND, 0); 1404 } else { 1405 l2->rc++; 1406 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, 1407 NULL, 9); 1408 send_uframe(l2, NULL, DISC | 0x10, CMD); 1409 } 1410 } 1411 1412 static void l2_st7_tout_200(struct FsmInst * fi,int event,void * arg)1413 l2_st7_tout_200(struct FsmInst *fi, int event, void *arg) 1414 { 1415 struct layer2 *l2 = fi->userdata; 1416 1417 if (test_bit(FLG_LAPD, &l2->flag) && 1418 test_bit(FLG_DCHAN_BUSY, &l2->flag)) { 1419 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9); 1420 return; 1421 } 1422 test_and_clear_bit(FLG_T200_RUN, &l2->flag); 1423 l2->rc = 0; 1424 mISDN_FsmChangeState(fi, ST_L2_8); 1425 transmit_enquiry(l2); 1426 l2->rc++; 1427 } 1428 1429 static void l2_st8_tout_200(struct FsmInst * fi,int event,void * arg)1430 l2_st8_tout_200(struct FsmInst *fi, int event, void *arg) 1431 { 1432 struct layer2 *l2 = fi->userdata; 1433 1434 if (test_bit(FLG_LAPD, &l2->flag) && 1435 test_bit(FLG_DCHAN_BUSY, &l2->flag)) { 1436 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 9); 1437 return; 1438 } 1439 test_and_clear_bit(FLG_T200_RUN, &l2->flag); 1440 if (l2->rc == l2->N200) { 1441 l2mgr(l2, MDL_ERROR_IND, (void *) 'I'); 1442 establishlink(fi); 1443 test_and_clear_bit(FLG_L3_INIT, &l2->flag); 1444 } else { 1445 transmit_enquiry(l2); 1446 l2->rc++; 1447 } 1448 } 1449 1450 static void l2_st7_tout_203(struct FsmInst * fi,int event,void * arg)1451 l2_st7_tout_203(struct FsmInst *fi, int event, void *arg) 1452 { 1453 struct layer2 *l2 = fi->userdata; 1454 1455 if (test_bit(FLG_LAPD, &l2->flag) && 1456 test_bit(FLG_DCHAN_BUSY, &l2->flag)) { 1457 mISDN_FsmAddTimer(&l2->t203, l2->T203, EV_L2_T203, NULL, 9); 1458 return; 1459 } 1460 mISDN_FsmChangeState(fi, ST_L2_8); 1461 transmit_enquiry(l2); 1462 l2->rc = 0; 1463 } 1464 1465 static void l2_pull_iqueue(struct FsmInst * fi,int event,void * arg)1466 l2_pull_iqueue(struct FsmInst *fi, int event, void *arg) 1467 { 1468 struct layer2 *l2 = fi->userdata; 1469 struct sk_buff *skb, *nskb; 1470 u_char header[MAX_L2HEADER_LEN]; 1471 u_int i, p1; 1472 1473 if (!cansend(l2)) 1474 return; 1475 1476 skb = skb_dequeue(&l2->i_queue); 1477 if (!skb) 1478 return; 1479 i = sethdraddr(l2, header, CMD); 1480 if (test_bit(FLG_MOD128, &l2->flag)) { 1481 header[i++] = l2->vs << 1; 1482 header[i++] = l2->vr << 1; 1483 } else 1484 header[i++] = (l2->vr << 5) | (l2->vs << 1); 1485 nskb = skb_realloc_headroom(skb, i); 1486 if (!nskb) { 1487 printk(KERN_WARNING "%s: no headroom(%d) copy for IFrame\n", 1488 mISDNDevName4ch(&l2->ch), i); 1489 skb_queue_head(&l2->i_queue, skb); 1490 return; 1491 } 1492 if (test_bit(FLG_MOD128, &l2->flag)) { 1493 p1 = (l2->vs - l2->va) % 128; 1494 l2->vs = (l2->vs + 1) % 128; 1495 } else { 1496 p1 = (l2->vs - l2->va) % 8; 1497 l2->vs = (l2->vs + 1) % 8; 1498 } 1499 p1 = (p1 + l2->sow) % l2->window; 1500 if (l2->windowar[p1]) { 1501 printk(KERN_WARNING "%s: l2 try overwrite ack queue entry %d\n", 1502 mISDNDevName4ch(&l2->ch), p1); 1503 dev_kfree_skb(l2->windowar[p1]); 1504 } 1505 l2->windowar[p1] = skb; 1506 memcpy(skb_push(nskb, i), header, i); 1507 l2down(l2, PH_DATA_REQ, l2_newid(l2), nskb); 1508 test_and_clear_bit(FLG_ACK_PEND, &l2->flag); 1509 if (!test_and_set_bit(FLG_T200_RUN, &l2->flag)) { 1510 mISDN_FsmDelTimer(&l2->t203, 13); 1511 mISDN_FsmAddTimer(&l2->t200, l2->T200, EV_L2_T200, NULL, 11); 1512 } 1513 } 1514 1515 static void l2_st8_got_super(struct FsmInst * fi,int event,void * arg)1516 l2_st8_got_super(struct FsmInst *fi, int event, void *arg) 1517 { 1518 struct layer2 *l2 = fi->userdata; 1519 struct sk_buff *skb = arg; 1520 int PollFlag, rsp, rnr = 0; 1521 unsigned int nr; 1522 1523 rsp = *skb->data & 0x2; 1524 if (test_bit(FLG_ORIG, &l2->flag)) 1525 rsp = !rsp; 1526 1527 skb_pull(skb, l2addrsize(l2)); 1528 1529 if (IsRNR(skb->data, l2)) { 1530 set_peer_busy(l2); 1531 rnr = 1; 1532 } else 1533 clear_peer_busy(l2); 1534 1535 if (test_bit(FLG_MOD128, &l2->flag)) { 1536 PollFlag = (skb->data[1] & 0x1) == 0x1; 1537 nr = skb->data[1] >> 1; 1538 } else { 1539 PollFlag = (skb->data[0] & 0x10); 1540 nr = (skb->data[0] >> 5) & 0x7; 1541 } 1542 dev_kfree_skb(skb); 1543 if (rsp && PollFlag) { 1544 if (legalnr(l2, nr)) { 1545 if (rnr) { 1546 restart_t200(l2, 15); 1547 } else { 1548 stop_t200(l2, 16); 1549 mISDN_FsmAddTimer(&l2->t203, l2->T203, 1550 EV_L2_T203, NULL, 5); 1551 setva(l2, nr); 1552 } 1553 invoke_retransmission(l2, nr); 1554 mISDN_FsmChangeState(fi, ST_L2_7); 1555 if (skb_queue_len(&l2->i_queue) && cansend(l2)) 1556 mISDN_FsmEvent(fi, EV_L2_ACK_PULL, NULL); 1557 } else 1558 nrerrorrecovery(fi); 1559 } else { 1560 if (!rsp && PollFlag) 1561 enquiry_response(l2); 1562 if (legalnr(l2, nr)) 1563 setva(l2, nr); 1564 else 1565 nrerrorrecovery(fi); 1566 } 1567 } 1568 1569 static void l2_got_FRMR(struct FsmInst * fi,int event,void * arg)1570 l2_got_FRMR(struct FsmInst *fi, int event, void *arg) 1571 { 1572 struct layer2 *l2 = fi->userdata; 1573 struct sk_buff *skb = arg; 1574 1575 skb_pull(skb, l2addrsize(l2) + 1); 1576 1577 if (!(skb->data[0] & 1) || ((skb->data[0] & 3) == 1) || /* I or S */ 1578 (IsUA(skb->data) && (fi->state == ST_L2_7))) { 1579 l2mgr(l2, MDL_ERROR_IND, (void *) 'K'); 1580 establishlink(fi); 1581 test_and_clear_bit(FLG_L3_INIT, &l2->flag); 1582 } 1583 dev_kfree_skb(skb); 1584 } 1585 1586 static void l2_st24_tei_remove(struct FsmInst * fi,int event,void * arg)1587 l2_st24_tei_remove(struct FsmInst *fi, int event, void *arg) 1588 { 1589 struct layer2 *l2 = fi->userdata; 1590 1591 skb_queue_purge(&l2->ui_queue); 1592 l2->tei = GROUP_TEI; 1593 mISDN_FsmChangeState(fi, ST_L2_1); 1594 } 1595 1596 static void l2_st3_tei_remove(struct FsmInst * fi,int event,void * arg)1597 l2_st3_tei_remove(struct FsmInst *fi, int event, void *arg) 1598 { 1599 struct layer2 *l2 = fi->userdata; 1600 1601 skb_queue_purge(&l2->ui_queue); 1602 l2->tei = GROUP_TEI; 1603 l2up_create(l2, DL_RELEASE_IND, 0, NULL); 1604 mISDN_FsmChangeState(fi, ST_L2_1); 1605 } 1606 1607 static void l2_st5_tei_remove(struct FsmInst * fi,int event,void * arg)1608 l2_st5_tei_remove(struct FsmInst *fi, int event, void *arg) 1609 { 1610 struct layer2 *l2 = fi->userdata; 1611 1612 skb_queue_purge(&l2->i_queue); 1613 skb_queue_purge(&l2->ui_queue); 1614 freewin(l2); 1615 l2->tei = GROUP_TEI; 1616 stop_t200(l2, 17); 1617 st5_dl_release_l2l3(l2); 1618 mISDN_FsmChangeState(fi, ST_L2_1); 1619 } 1620 1621 static void l2_st6_tei_remove(struct FsmInst * fi,int event,void * arg)1622 l2_st6_tei_remove(struct FsmInst *fi, int event, void *arg) 1623 { 1624 struct layer2 *l2 = fi->userdata; 1625 1626 skb_queue_purge(&l2->ui_queue); 1627 l2->tei = GROUP_TEI; 1628 stop_t200(l2, 18); 1629 l2up_create(l2, DL_RELEASE_IND, 0, NULL); 1630 mISDN_FsmChangeState(fi, ST_L2_1); 1631 } 1632 1633 static void l2_tei_remove(struct FsmInst * fi,int event,void * arg)1634 l2_tei_remove(struct FsmInst *fi, int event, void *arg) 1635 { 1636 struct layer2 *l2 = fi->userdata; 1637 1638 skb_queue_purge(&l2->i_queue); 1639 skb_queue_purge(&l2->ui_queue); 1640 freewin(l2); 1641 l2->tei = GROUP_TEI; 1642 stop_t200(l2, 17); 1643 mISDN_FsmDelTimer(&l2->t203, 19); 1644 l2up_create(l2, DL_RELEASE_IND, 0, NULL); 1645 /* mISDN_queue_data(&l2->inst, l2->inst.id | MSG_BROADCAST, 1646 * MGR_SHORTSTATUS_IND, SSTATUS_L2_RELEASED, 1647 * 0, NULL, 0); 1648 */ 1649 mISDN_FsmChangeState(fi, ST_L2_1); 1650 } 1651 1652 static void l2_st14_persistent_da(struct FsmInst * fi,int event,void * arg)1653 l2_st14_persistent_da(struct FsmInst *fi, int event, void *arg) 1654 { 1655 struct layer2 *l2 = fi->userdata; 1656 struct sk_buff *skb = arg; 1657 1658 skb_queue_purge(&l2->i_queue); 1659 skb_queue_purge(&l2->ui_queue); 1660 if (test_and_clear_bit(FLG_ESTAB_PEND, &l2->flag)) 1661 l2up(l2, DL_RELEASE_IND, skb); 1662 else 1663 dev_kfree_skb(skb); 1664 } 1665 1666 static void l2_st5_persistent_da(struct FsmInst * fi,int event,void * arg)1667 l2_st5_persistent_da(struct FsmInst *fi, int event, void *arg) 1668 { 1669 struct layer2 *l2 = fi->userdata; 1670 struct sk_buff *skb = arg; 1671 1672 skb_queue_purge(&l2->i_queue); 1673 skb_queue_purge(&l2->ui_queue); 1674 freewin(l2); 1675 stop_t200(l2, 19); 1676 st5_dl_release_l2l3(l2); 1677 mISDN_FsmChangeState(fi, ST_L2_4); 1678 if (l2->tm) 1679 l2_tei(l2, MDL_STATUS_DOWN_IND, 0); 1680 dev_kfree_skb(skb); 1681 } 1682 1683 static void l2_st6_persistent_da(struct FsmInst * fi,int event,void * arg)1684 l2_st6_persistent_da(struct FsmInst *fi, int event, void *arg) 1685 { 1686 struct layer2 *l2 = fi->userdata; 1687 struct sk_buff *skb = arg; 1688 1689 skb_queue_purge(&l2->ui_queue); 1690 stop_t200(l2, 20); 1691 l2up(l2, DL_RELEASE_CNF, skb); 1692 mISDN_FsmChangeState(fi, ST_L2_4); 1693 if (l2->tm) 1694 l2_tei(l2, MDL_STATUS_DOWN_IND, 0); 1695 } 1696 1697 static void l2_persistent_da(struct FsmInst * fi,int event,void * arg)1698 l2_persistent_da(struct FsmInst *fi, int event, void *arg) 1699 { 1700 struct layer2 *l2 = fi->userdata; 1701 struct sk_buff *skb = arg; 1702 1703 skb_queue_purge(&l2->i_queue); 1704 skb_queue_purge(&l2->ui_queue); 1705 freewin(l2); 1706 stop_t200(l2, 19); 1707 mISDN_FsmDelTimer(&l2->t203, 19); 1708 l2up(l2, DL_RELEASE_IND, skb); 1709 mISDN_FsmChangeState(fi, ST_L2_4); 1710 if (l2->tm) 1711 l2_tei(l2, MDL_STATUS_DOWN_IND, 0); 1712 } 1713 1714 static void l2_set_own_busy(struct FsmInst * fi,int event,void * arg)1715 l2_set_own_busy(struct FsmInst *fi, int event, void *arg) 1716 { 1717 struct layer2 *l2 = fi->userdata; 1718 struct sk_buff *skb = arg; 1719 1720 if (!test_and_set_bit(FLG_OWN_BUSY, &l2->flag)) { 1721 enquiry_cr(l2, RNR, RSP, 0); 1722 test_and_clear_bit(FLG_ACK_PEND, &l2->flag); 1723 } 1724 dev_kfree_skb(skb); 1725 } 1726 1727 static void l2_clear_own_busy(struct FsmInst * fi,int event,void * arg)1728 l2_clear_own_busy(struct FsmInst *fi, int event, void *arg) 1729 { 1730 struct layer2 *l2 = fi->userdata; 1731 struct sk_buff *skb = arg; 1732 1733 if (!test_and_clear_bit(FLG_OWN_BUSY, &l2->flag)) { 1734 enquiry_cr(l2, RR, RSP, 0); 1735 test_and_clear_bit(FLG_ACK_PEND, &l2->flag); 1736 } 1737 dev_kfree_skb(skb); 1738 } 1739 1740 static void l2_frame_error(struct FsmInst * fi,int event,void * arg)1741 l2_frame_error(struct FsmInst *fi, int event, void *arg) 1742 { 1743 struct layer2 *l2 = fi->userdata; 1744 1745 l2mgr(l2, MDL_ERROR_IND, arg); 1746 } 1747 1748 static void l2_frame_error_reest(struct FsmInst * fi,int event,void * arg)1749 l2_frame_error_reest(struct FsmInst *fi, int event, void *arg) 1750 { 1751 struct layer2 *l2 = fi->userdata; 1752 1753 l2mgr(l2, MDL_ERROR_IND, arg); 1754 establishlink(fi); 1755 test_and_clear_bit(FLG_L3_INIT, &l2->flag); 1756 } 1757 1758 static struct FsmNode L2FnList[] = 1759 { 1760 {ST_L2_1, EV_L2_DL_ESTABLISH_REQ, l2_mdl_assign}, 1761 {ST_L2_2, EV_L2_DL_ESTABLISH_REQ, l2_go_st3}, 1762 {ST_L2_4, EV_L2_DL_ESTABLISH_REQ, l2_establish}, 1763 {ST_L2_5, EV_L2_DL_ESTABLISH_REQ, l2_discard_i_setl3}, 1764 {ST_L2_7, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish}, 1765 {ST_L2_8, EV_L2_DL_ESTABLISH_REQ, l2_l3_reestablish}, 1766 {ST_L2_4, EV_L2_DL_RELEASE_REQ, l2_release}, 1767 {ST_L2_5, EV_L2_DL_RELEASE_REQ, l2_pend_rel}, 1768 {ST_L2_7, EV_L2_DL_RELEASE_REQ, l2_disconnect}, 1769 {ST_L2_8, EV_L2_DL_RELEASE_REQ, l2_disconnect}, 1770 {ST_L2_5, EV_L2_DL_DATA, l2_feed_i_if_reest}, 1771 {ST_L2_7, EV_L2_DL_DATA, l2_feed_i_pull}, 1772 {ST_L2_8, EV_L2_DL_DATA, l2_feed_iqueue}, 1773 {ST_L2_1, EV_L2_DL_UNITDATA, l2_queue_ui_assign}, 1774 {ST_L2_2, EV_L2_DL_UNITDATA, l2_queue_ui}, 1775 {ST_L2_3, EV_L2_DL_UNITDATA, l2_queue_ui}, 1776 {ST_L2_4, EV_L2_DL_UNITDATA, l2_send_ui}, 1777 {ST_L2_5, EV_L2_DL_UNITDATA, l2_send_ui}, 1778 {ST_L2_6, EV_L2_DL_UNITDATA, l2_send_ui}, 1779 {ST_L2_7, EV_L2_DL_UNITDATA, l2_send_ui}, 1780 {ST_L2_8, EV_L2_DL_UNITDATA, l2_send_ui}, 1781 {ST_L2_1, EV_L2_MDL_ASSIGN, l2_got_tei}, 1782 {ST_L2_2, EV_L2_MDL_ASSIGN, l2_got_tei}, 1783 {ST_L2_3, EV_L2_MDL_ASSIGN, l2_got_tei}, 1784 {ST_L2_2, EV_L2_MDL_ERROR, l2_st24_tei_remove}, 1785 {ST_L2_3, EV_L2_MDL_ERROR, l2_st3_tei_remove}, 1786 {ST_L2_4, EV_L2_MDL_REMOVE, l2_st24_tei_remove}, 1787 {ST_L2_5, EV_L2_MDL_REMOVE, l2_st5_tei_remove}, 1788 {ST_L2_6, EV_L2_MDL_REMOVE, l2_st6_tei_remove}, 1789 {ST_L2_7, EV_L2_MDL_REMOVE, l2_tei_remove}, 1790 {ST_L2_8, EV_L2_MDL_REMOVE, l2_tei_remove}, 1791 {ST_L2_4, EV_L2_SABME, l2_start_multi}, 1792 {ST_L2_5, EV_L2_SABME, l2_send_UA}, 1793 {ST_L2_6, EV_L2_SABME, l2_send_DM}, 1794 {ST_L2_7, EV_L2_SABME, l2_restart_multi}, 1795 {ST_L2_8, EV_L2_SABME, l2_restart_multi}, 1796 {ST_L2_4, EV_L2_DISC, l2_send_DM}, 1797 {ST_L2_5, EV_L2_DISC, l2_send_DM}, 1798 {ST_L2_6, EV_L2_DISC, l2_send_UA}, 1799 {ST_L2_7, EV_L2_DISC, l2_stop_multi}, 1800 {ST_L2_8, EV_L2_DISC, l2_stop_multi}, 1801 {ST_L2_4, EV_L2_UA, l2_mdl_error_ua}, 1802 {ST_L2_5, EV_L2_UA, l2_connected}, 1803 {ST_L2_6, EV_L2_UA, l2_released}, 1804 {ST_L2_7, EV_L2_UA, l2_mdl_error_ua}, 1805 {ST_L2_8, EV_L2_UA, l2_mdl_error_ua}, 1806 {ST_L2_4, EV_L2_DM, l2_reestablish}, 1807 {ST_L2_5, EV_L2_DM, l2_st5_dm_release}, 1808 {ST_L2_6, EV_L2_DM, l2_st6_dm_release}, 1809 {ST_L2_7, EV_L2_DM, l2_mdl_error_dm}, 1810 {ST_L2_8, EV_L2_DM, l2_st8_mdl_error_dm}, 1811 {ST_L2_1, EV_L2_UI, l2_got_ui}, 1812 {ST_L2_2, EV_L2_UI, l2_got_ui}, 1813 {ST_L2_3, EV_L2_UI, l2_got_ui}, 1814 {ST_L2_4, EV_L2_UI, l2_got_ui}, 1815 {ST_L2_5, EV_L2_UI, l2_got_ui}, 1816 {ST_L2_6, EV_L2_UI, l2_got_ui}, 1817 {ST_L2_7, EV_L2_UI, l2_got_ui}, 1818 {ST_L2_8, EV_L2_UI, l2_got_ui}, 1819 {ST_L2_7, EV_L2_FRMR, l2_got_FRMR}, 1820 {ST_L2_8, EV_L2_FRMR, l2_got_FRMR}, 1821 {ST_L2_7, EV_L2_SUPER, l2_st7_got_super}, 1822 {ST_L2_8, EV_L2_SUPER, l2_st8_got_super}, 1823 {ST_L2_7, EV_L2_I, l2_got_iframe}, 1824 {ST_L2_8, EV_L2_I, l2_got_iframe}, 1825 {ST_L2_5, EV_L2_T200, l2_timeout}, 1826 {ST_L2_6, EV_L2_T200, l2_timeout}, 1827 {ST_L2_7, EV_L2_T200, l2_timeout}, 1828 {ST_L2_8, EV_L2_T200, l2_timeout}, 1829 {ST_L2_7, EV_L2_T203, l2_timeout}, 1830 {ST_L2_5, EV_L2_T200I, l2_st5_tout_200}, 1831 {ST_L2_6, EV_L2_T200I, l2_st6_tout_200}, 1832 {ST_L2_7, EV_L2_T200I, l2_st7_tout_200}, 1833 {ST_L2_8, EV_L2_T200I, l2_st8_tout_200}, 1834 {ST_L2_7, EV_L2_T203I, l2_st7_tout_203}, 1835 {ST_L2_7, EV_L2_ACK_PULL, l2_pull_iqueue}, 1836 {ST_L2_7, EV_L2_SET_OWN_BUSY, l2_set_own_busy}, 1837 {ST_L2_8, EV_L2_SET_OWN_BUSY, l2_set_own_busy}, 1838 {ST_L2_7, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy}, 1839 {ST_L2_8, EV_L2_CLEAR_OWN_BUSY, l2_clear_own_busy}, 1840 {ST_L2_4, EV_L2_FRAME_ERROR, l2_frame_error}, 1841 {ST_L2_5, EV_L2_FRAME_ERROR, l2_frame_error}, 1842 {ST_L2_6, EV_L2_FRAME_ERROR, l2_frame_error}, 1843 {ST_L2_7, EV_L2_FRAME_ERROR, l2_frame_error_reest}, 1844 {ST_L2_8, EV_L2_FRAME_ERROR, l2_frame_error_reest}, 1845 {ST_L2_1, EV_L1_DEACTIVATE, l2_st14_persistent_da}, 1846 {ST_L2_2, EV_L1_DEACTIVATE, l2_st24_tei_remove}, 1847 {ST_L2_3, EV_L1_DEACTIVATE, l2_st3_tei_remove}, 1848 {ST_L2_4, EV_L1_DEACTIVATE, l2_st14_persistent_da}, 1849 {ST_L2_5, EV_L1_DEACTIVATE, l2_st5_persistent_da}, 1850 {ST_L2_6, EV_L1_DEACTIVATE, l2_st6_persistent_da}, 1851 {ST_L2_7, EV_L1_DEACTIVATE, l2_persistent_da}, 1852 {ST_L2_8, EV_L1_DEACTIVATE, l2_persistent_da}, 1853 }; 1854 1855 static int ph_data_indication(struct layer2 * l2,struct mISDNhead * hh,struct sk_buff * skb)1856 ph_data_indication(struct layer2 *l2, struct mISDNhead *hh, struct sk_buff *skb) 1857 { 1858 u_char *datap = skb->data; 1859 int ret = -EINVAL; 1860 int psapi, ptei; 1861 u_int l; 1862 int c = 0; 1863 1864 l = l2addrsize(l2); 1865 if (skb->len <= l) { 1866 mISDN_FsmEvent(&l2->l2m, EV_L2_FRAME_ERROR, (void *) 'N'); 1867 return ret; 1868 } 1869 if (test_bit(FLG_LAPD, &l2->flag)) { /* Maybe not needed */ 1870 psapi = *datap++; 1871 ptei = *datap++; 1872 if ((psapi & 1) || !(ptei & 1)) { 1873 printk(KERN_WARNING 1874 "%s l2 D-channel frame wrong EA0/EA1\n", 1875 mISDNDevName4ch(&l2->ch)); 1876 return ret; 1877 } 1878 psapi >>= 2; 1879 ptei >>= 1; 1880 if (psapi != l2->sapi) { 1881 /* not our business */ 1882 if (*debug & DEBUG_L2) 1883 printk(KERN_DEBUG "%s: sapi %d/%d mismatch\n", 1884 mISDNDevName4ch(&l2->ch), psapi, 1885 l2->sapi); 1886 dev_kfree_skb(skb); 1887 return 0; 1888 } 1889 if ((ptei != l2->tei) && (ptei != GROUP_TEI)) { 1890 /* not our business */ 1891 if (*debug & DEBUG_L2) 1892 printk(KERN_DEBUG "%s: tei %d/%d mismatch\n", 1893 mISDNDevName4ch(&l2->ch), ptei, l2->tei); 1894 dev_kfree_skb(skb); 1895 return 0; 1896 } 1897 } else 1898 datap += l; 1899 if (!(*datap & 1)) { /* I-Frame */ 1900 c = iframe_error(l2, skb); 1901 if (!c) 1902 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_I, skb); 1903 } else if (IsSFrame(datap, l2)) { /* S-Frame */ 1904 c = super_error(l2, skb); 1905 if (!c) 1906 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_SUPER, skb); 1907 } else if (IsUI(datap)) { 1908 c = UI_error(l2, skb); 1909 if (!c) 1910 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_UI, skb); 1911 } else if (IsSABME(datap, l2)) { 1912 c = unnum_error(l2, skb, CMD); 1913 if (!c) 1914 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_SABME, skb); 1915 } else if (IsUA(datap)) { 1916 c = unnum_error(l2, skb, RSP); 1917 if (!c) 1918 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_UA, skb); 1919 } else if (IsDISC(datap)) { 1920 c = unnum_error(l2, skb, CMD); 1921 if (!c) 1922 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DISC, skb); 1923 } else if (IsDM(datap)) { 1924 c = unnum_error(l2, skb, RSP); 1925 if (!c) 1926 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DM, skb); 1927 } else if (IsFRMR(datap)) { 1928 c = FRMR_error(l2, skb); 1929 if (!c) 1930 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_FRMR, skb); 1931 } else 1932 c = 'L'; 1933 if (c) { 1934 printk(KERN_WARNING "%s:l2 D-channel frame error %c\n", 1935 mISDNDevName4ch(&l2->ch), c); 1936 mISDN_FsmEvent(&l2->l2m, EV_L2_FRAME_ERROR, (void *)(long)c); 1937 } 1938 return ret; 1939 } 1940 1941 static int l2_send(struct mISDNchannel * ch,struct sk_buff * skb)1942 l2_send(struct mISDNchannel *ch, struct sk_buff *skb) 1943 { 1944 struct layer2 *l2 = container_of(ch, struct layer2, ch); 1945 struct mISDNhead *hh = mISDN_HEAD_P(skb); 1946 int ret = -EINVAL; 1947 1948 if (*debug & DEBUG_L2_RECV) 1949 printk(KERN_DEBUG "%s: %s prim(%x) id(%x) sapi(%d) tei(%d)\n", 1950 __func__, mISDNDevName4ch(&l2->ch), hh->prim, hh->id, 1951 l2->sapi, l2->tei); 1952 if (hh->prim == DL_INTERN_MSG) { 1953 struct mISDNhead *chh = hh + 1; /* saved copy */ 1954 1955 *hh = *chh; 1956 if (*debug & DEBUG_L2_RECV) 1957 printk(KERN_DEBUG "%s: prim(%x) id(%x) internal msg\n", 1958 mISDNDevName4ch(&l2->ch), hh->prim, hh->id); 1959 } 1960 switch (hh->prim) { 1961 case PH_DATA_IND: 1962 ret = ph_data_indication(l2, hh, skb); 1963 break; 1964 case PH_DATA_CNF: 1965 ret = ph_data_confirm(l2, hh, skb); 1966 break; 1967 case PH_ACTIVATE_IND: 1968 test_and_set_bit(FLG_L1_ACTIV, &l2->flag); 1969 l2up_create(l2, MPH_ACTIVATE_IND, 0, NULL); 1970 if (test_and_clear_bit(FLG_ESTAB_PEND, &l2->flag)) 1971 ret = mISDN_FsmEvent(&l2->l2m, 1972 EV_L2_DL_ESTABLISH_REQ, skb); 1973 break; 1974 case PH_DEACTIVATE_IND: 1975 test_and_clear_bit(FLG_L1_ACTIV, &l2->flag); 1976 l2up_create(l2, MPH_DEACTIVATE_IND, 0, NULL); 1977 ret = mISDN_FsmEvent(&l2->l2m, EV_L1_DEACTIVATE, skb); 1978 break; 1979 case MPH_INFORMATION_IND: 1980 if (!l2->up) 1981 break; 1982 ret = l2->up->send(l2->up, skb); 1983 break; 1984 case DL_DATA_REQ: 1985 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_DATA, skb); 1986 break; 1987 case DL_UNITDATA_REQ: 1988 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_UNITDATA, skb); 1989 break; 1990 case DL_ESTABLISH_REQ: 1991 if (test_bit(FLG_LAPB, &l2->flag)) 1992 test_and_set_bit(FLG_ORIG, &l2->flag); 1993 if (test_bit(FLG_L1_ACTIV, &l2->flag)) { 1994 if (test_bit(FLG_LAPD, &l2->flag) || 1995 test_bit(FLG_ORIG, &l2->flag)) 1996 ret = mISDN_FsmEvent(&l2->l2m, 1997 EV_L2_DL_ESTABLISH_REQ, skb); 1998 } else { 1999 if (test_bit(FLG_LAPD, &l2->flag) || 2000 test_bit(FLG_ORIG, &l2->flag)) { 2001 test_and_set_bit(FLG_ESTAB_PEND, 2002 &l2->flag); 2003 } 2004 ret = l2down(l2, PH_ACTIVATE_REQ, l2_newid(l2), 2005 skb); 2006 } 2007 break; 2008 case DL_RELEASE_REQ: 2009 if (test_bit(FLG_LAPB, &l2->flag)) 2010 l2down_create(l2, PH_DEACTIVATE_REQ, 2011 l2_newid(l2), 0, NULL); 2012 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_DL_RELEASE_REQ, 2013 skb); 2014 break; 2015 case DL_TIMER200_IND: 2016 mISDN_FsmEvent(&l2->l2m, EV_L2_T200I, NULL); 2017 break; 2018 case DL_TIMER203_IND: 2019 mISDN_FsmEvent(&l2->l2m, EV_L2_T203I, NULL); 2020 break; 2021 default: 2022 if (*debug & DEBUG_L2) 2023 l2m_debug(&l2->l2m, "l2 unknown pr %04x", 2024 hh->prim); 2025 } 2026 if (ret) { 2027 dev_kfree_skb(skb); 2028 ret = 0; 2029 } 2030 return ret; 2031 } 2032 2033 int tei_l2(struct layer2 * l2,u_int cmd,u_long arg)2034 tei_l2(struct layer2 *l2, u_int cmd, u_long arg) 2035 { 2036 int ret = -EINVAL; 2037 2038 if (*debug & DEBUG_L2_TEI) 2039 printk(KERN_DEBUG "%s: cmd(%x) in %s\n", 2040 mISDNDevName4ch(&l2->ch), cmd, __func__); 2041 switch (cmd) { 2042 case (MDL_ASSIGN_REQ): 2043 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_ASSIGN, (void *)arg); 2044 break; 2045 case (MDL_REMOVE_REQ): 2046 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_REMOVE, NULL); 2047 break; 2048 case (MDL_ERROR_IND): 2049 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_ERROR, NULL); 2050 break; 2051 case (MDL_ERROR_RSP): 2052 /* ETS 300-125 5.3.2.1 Test: TC13010 */ 2053 printk(KERN_NOTICE "%s: MDL_ERROR|REQ (tei_l2)\n", 2054 mISDNDevName4ch(&l2->ch)); 2055 ret = mISDN_FsmEvent(&l2->l2m, EV_L2_MDL_ERROR, NULL); 2056 break; 2057 } 2058 return ret; 2059 } 2060 2061 static void release_l2(struct layer2 * l2)2062 release_l2(struct layer2 *l2) 2063 { 2064 mISDN_FsmDelTimer(&l2->t200, 21); 2065 mISDN_FsmDelTimer(&l2->t203, 16); 2066 skb_queue_purge(&l2->i_queue); 2067 skb_queue_purge(&l2->ui_queue); 2068 skb_queue_purge(&l2->down_queue); 2069 ReleaseWin(l2); 2070 if (test_bit(FLG_LAPD, &l2->flag)) { 2071 TEIrelease(l2); 2072 if (l2->ch.st) 2073 l2->ch.st->dev->D.ctrl(&l2->ch.st->dev->D, 2074 CLOSE_CHANNEL, NULL); 2075 } 2076 kfree(l2); 2077 } 2078 2079 static int l2_ctrl(struct mISDNchannel * ch,u_int cmd,void * arg)2080 l2_ctrl(struct mISDNchannel *ch, u_int cmd, void *arg) 2081 { 2082 struct layer2 *l2 = container_of(ch, struct layer2, ch); 2083 u_int info; 2084 2085 if (*debug & DEBUG_L2_CTRL) 2086 printk(KERN_DEBUG "%s: %s cmd(%x)\n", 2087 mISDNDevName4ch(ch), __func__, cmd); 2088 2089 switch (cmd) { 2090 case OPEN_CHANNEL: 2091 if (test_bit(FLG_LAPD, &l2->flag)) { 2092 set_channel_address(&l2->ch, l2->sapi, l2->tei); 2093 info = DL_INFO_L2_CONNECT; 2094 l2up_create(l2, DL_INFORMATION_IND, 2095 sizeof(info), &info); 2096 } 2097 break; 2098 case CLOSE_CHANNEL: 2099 if (l2->ch.peer) 2100 l2->ch.peer->ctrl(l2->ch.peer, CLOSE_CHANNEL, NULL); 2101 release_l2(l2); 2102 break; 2103 } 2104 return 0; 2105 } 2106 2107 struct layer2 * create_l2(struct mISDNchannel * ch,u_int protocol,u_long options,int tei,int sapi)2108 create_l2(struct mISDNchannel *ch, u_int protocol, u_long options, int tei, 2109 int sapi) 2110 { 2111 struct layer2 *l2; 2112 struct channel_req rq; 2113 2114 l2 = kzalloc(sizeof(struct layer2), GFP_KERNEL); 2115 if (!l2) { 2116 printk(KERN_ERR "kzalloc layer2 failed\n"); 2117 return NULL; 2118 } 2119 l2->next_id = 1; 2120 l2->down_id = MISDN_ID_NONE; 2121 l2->up = ch; 2122 l2->ch.st = ch->st; 2123 l2->ch.send = l2_send; 2124 l2->ch.ctrl = l2_ctrl; 2125 switch (protocol) { 2126 case ISDN_P_LAPD_NT: 2127 test_and_set_bit(FLG_LAPD, &l2->flag); 2128 test_and_set_bit(FLG_LAPD_NET, &l2->flag); 2129 test_and_set_bit(FLG_MOD128, &l2->flag); 2130 l2->sapi = sapi; 2131 l2->maxlen = MAX_DFRAME_LEN; 2132 if (test_bit(OPTION_L2_PMX, &options)) 2133 l2->window = 7; 2134 else 2135 l2->window = 1; 2136 if (test_bit(OPTION_L2_PTP, &options)) 2137 test_and_set_bit(FLG_PTP, &l2->flag); 2138 if (test_bit(OPTION_L2_FIXEDTEI, &options)) 2139 test_and_set_bit(FLG_FIXED_TEI, &l2->flag); 2140 l2->tei = tei; 2141 l2->T200 = 1000; 2142 l2->N200 = 3; 2143 l2->T203 = 10000; 2144 if (test_bit(OPTION_L2_PMX, &options)) 2145 rq.protocol = ISDN_P_NT_E1; 2146 else 2147 rq.protocol = ISDN_P_NT_S0; 2148 rq.adr.channel = 0; 2149 l2->ch.st->dev->D.ctrl(&l2->ch.st->dev->D, OPEN_CHANNEL, &rq); 2150 break; 2151 case ISDN_P_LAPD_TE: 2152 test_and_set_bit(FLG_LAPD, &l2->flag); 2153 test_and_set_bit(FLG_MOD128, &l2->flag); 2154 test_and_set_bit(FLG_ORIG, &l2->flag); 2155 l2->sapi = sapi; 2156 l2->maxlen = MAX_DFRAME_LEN; 2157 if (test_bit(OPTION_L2_PMX, &options)) 2158 l2->window = 7; 2159 else 2160 l2->window = 1; 2161 if (test_bit(OPTION_L2_PTP, &options)) 2162 test_and_set_bit(FLG_PTP, &l2->flag); 2163 if (test_bit(OPTION_L2_FIXEDTEI, &options)) 2164 test_and_set_bit(FLG_FIXED_TEI, &l2->flag); 2165 l2->tei = tei; 2166 l2->T200 = 1000; 2167 l2->N200 = 3; 2168 l2->T203 = 10000; 2169 if (test_bit(OPTION_L2_PMX, &options)) 2170 rq.protocol = ISDN_P_TE_E1; 2171 else 2172 rq.protocol = ISDN_P_TE_S0; 2173 rq.adr.channel = 0; 2174 l2->ch.st->dev->D.ctrl(&l2->ch.st->dev->D, OPEN_CHANNEL, &rq); 2175 break; 2176 case ISDN_P_B_X75SLP: 2177 test_and_set_bit(FLG_LAPB, &l2->flag); 2178 l2->window = 7; 2179 l2->maxlen = MAX_DATA_SIZE; 2180 l2->T200 = 1000; 2181 l2->N200 = 4; 2182 l2->T203 = 5000; 2183 l2->addr.A = 3; 2184 l2->addr.B = 1; 2185 break; 2186 default: 2187 printk(KERN_ERR "layer2 create failed prt %x\n", 2188 protocol); 2189 kfree(l2); 2190 return NULL; 2191 } 2192 skb_queue_head_init(&l2->i_queue); 2193 skb_queue_head_init(&l2->ui_queue); 2194 skb_queue_head_init(&l2->down_queue); 2195 skb_queue_head_init(&l2->tmp_queue); 2196 InitWin(l2); 2197 l2->l2m.fsm = &l2fsm; 2198 if (test_bit(FLG_LAPB, &l2->flag) || 2199 test_bit(FLG_FIXED_TEI, &l2->flag) || 2200 test_bit(FLG_LAPD_NET, &l2->flag)) 2201 l2->l2m.state = ST_L2_4; 2202 else 2203 l2->l2m.state = ST_L2_1; 2204 l2->l2m.debug = *debug; 2205 l2->l2m.userdata = l2; 2206 l2->l2m.userint = 0; 2207 l2->l2m.printdebug = l2m_debug; 2208 2209 mISDN_FsmInitTimer(&l2->l2m, &l2->t200); 2210 mISDN_FsmInitTimer(&l2->l2m, &l2->t203); 2211 return l2; 2212 } 2213 2214 static int x75create(struct channel_req * crq)2215 x75create(struct channel_req *crq) 2216 { 2217 struct layer2 *l2; 2218 2219 if (crq->protocol != ISDN_P_B_X75SLP) 2220 return -EPROTONOSUPPORT; 2221 l2 = create_l2(crq->ch, crq->protocol, 0, 0, 0); 2222 if (!l2) 2223 return -ENOMEM; 2224 crq->ch = &l2->ch; 2225 crq->protocol = ISDN_P_B_HDLC; 2226 return 0; 2227 } 2228 2229 static struct Bprotocol X75SLP = { 2230 .Bprotocols = (1 << (ISDN_P_B_X75SLP & ISDN_P_B_MASK)), 2231 .name = "X75SLP", 2232 .create = x75create 2233 }; 2234 2235 int Isdnl2_Init(u_int * deb)2236 Isdnl2_Init(u_int *deb) 2237 { 2238 int res; 2239 debug = deb; 2240 mISDN_register_Bprotocol(&X75SLP); 2241 l2fsm.state_count = L2_STATE_COUNT; 2242 l2fsm.event_count = L2_EVENT_COUNT; 2243 l2fsm.strEvent = strL2Event; 2244 l2fsm.strState = strL2State; 2245 res = mISDN_FsmNew(&l2fsm, L2FnList, ARRAY_SIZE(L2FnList)); 2246 if (res) 2247 goto error; 2248 res = TEIInit(deb); 2249 if (res) 2250 goto error_fsm; 2251 return 0; 2252 2253 error_fsm: 2254 mISDN_FsmFree(&l2fsm); 2255 error: 2256 mISDN_unregister_Bprotocol(&X75SLP); 2257 return res; 2258 } 2259 2260 void Isdnl2_cleanup(void)2261 Isdnl2_cleanup(void) 2262 { 2263 mISDN_unregister_Bprotocol(&X75SLP); 2264 TEIFree(); 2265 mISDN_FsmFree(&l2fsm); 2266 } 2267