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sys/netgraph/ng_lmi.c
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1 2 /* 3 * ng_lmi.c 4 * 5 * Copyright (c) 1996-1999 Whistle Communications, Inc. 6 * All rights reserved. 7 * 8 * Subject to the following obligations and disclaimer of warranty, use and 9 * redistribution of this software, in source or object code forms, with or 10 * without modifications are expressly permitted by Whistle Communications; 11 * provided, however, that: 12 * 1. Any and all reproductions of the source or object code must include the 13 * copyright notice above and the following disclaimer of warranties; and 14 * 2. No rights are granted, in any manner or form, to use Whistle 15 * Communications, Inc. trademarks, including the mark "WHISTLE 16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 17 * such appears in the above copyright notice or in the software. 18 * 19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 35 * OF SUCH DAMAGE. 36 * 37 * Author: Julian Elischer <julian@freebsd.org> 38 * 39 * $FreeBSD$ 40 * $Whistle: ng_lmi.c,v 1.38 1999/11/01 09:24:52 julian Exp $ 41 */ 42 43 /* 44 * This node performs the frame relay LMI protocol. It knows how 45 * to do ITU Annex A, ANSI Annex D, and "Group-of-Four" variants 46 * of the protocol. 47 * 48 * A specific protocol can be forced by connecting the corresponding 49 * hook to DLCI 0 or 1023 (as appropriate) of a frame relay link. 50 * 51 * Alternately, this node can do auto-detection of the LMI protocol 52 * by connecting hook "auto0" to DLCI 0 and "auto1023" to DLCI 1023. 53 */ 54 55 #include <sys/param.h> 56 #include <sys/systm.h> 57 #include <sys/errno.h> 58 #include <sys/kernel.h> 59 #include <sys/malloc.h> 60 #include <sys/mbuf.h> 61 #include <sys/syslog.h> 62 #include <netgraph/ng_message.h> 63 #include <netgraph/netgraph.h> 64 #include <netgraph/ng_lmi.h> 65 66 /* 67 * Human readable names for LMI 68 */ 69 #define NAME_ANNEXA NG_LMI_HOOK_ANNEXA 70 #define NAME_ANNEXD NG_LMI_HOOK_ANNEXD 71 #define NAME_GROUP4 NG_LMI_HOOK_GROUPOF4 72 #define NAME_NONE "None" 73 74 #define MAX_DLCIS 128 75 #define MAXDLCI 1023 76 77 /* 78 * DLCI states 79 */ 80 #define DLCI_NULL 0 81 #define DLCI_UP 1 82 #define DLCI_DOWN 2 83 84 /* 85 * Any received LMI frame should be at least this long 86 */ 87 #define LMI_MIN_LENGTH 8 /* XXX verify */ 88 89 /* 90 * Netgraph node methods and type descriptor 91 */ 92 static ng_constructor_t nglmi_constructor; 93 static ng_rcvmsg_t nglmi_rcvmsg; 94 static ng_shutdown_t nglmi_rmnode; 95 static ng_newhook_t nglmi_newhook; 96 static ng_rcvdata_t nglmi_rcvdata; 97 static ng_disconnect_t nglmi_disconnect; 98 static int nglmi_checkdata(hook_p hook, struct mbuf *m, meta_p meta); 99 100 static struct ng_type typestruct = { 101 NG_VERSION, 102 NG_LMI_NODE_TYPE, 103 NULL, 104 nglmi_constructor, 105 nglmi_rcvmsg, 106 nglmi_rmnode, 107 nglmi_newhook, 108 NULL, 109 NULL, 110 nglmi_rcvdata, 111 nglmi_rcvdata, 112 nglmi_disconnect, 113 NULL 114 }; 115 NETGRAPH_INIT(lmi, &typestruct); 116 117 /* 118 * Info and status per node 119 */ 120 struct nglmi_softc { 121 node_p node; /* netgraph node */ 122 int flags; /* state */ 123 int poll_count; /* the count of times for autolmi */ 124 int poll_state; /* state of auto detect machine */ 125 u_char remote_seq; /* sequence number the remote sent */ 126 u_char local_seq; /* last sequence number we sent */ 127 u_char protoID; /* 9 for group of 4, 8 otherwise */ 128 u_long seq_retries; /* sent this how many time so far */ 129 struct callout_handle handle; /* see timeout(9) */ 130 int liv_per_full; 131 int liv_rate; 132 int livs; 133 int need_full; 134 hook_p lmi_channel; /* whatever we ended up using */ 135 hook_p lmi_annexA; 136 hook_p lmi_annexD; 137 hook_p lmi_group4; 138 hook_p lmi_channel0; /* auto-detect on DLCI 0 */ 139 hook_p lmi_channel1023;/* auto-detect on DLCI 1023 */ 140 char *protoname; /* cache protocol name */ 141 u_char dlci_state[MAXDLCI + 1]; 142 int invalidx; /* next dlci's to invalidate */ 143 }; 144 typedef struct nglmi_softc *sc_p; 145 146 /* 147 * Other internal functions 148 */ 149 static void LMI_ticker(void *arg); 150 static void nglmi_startup_fixed(sc_p sc, hook_p hook); 151 static void nglmi_startup_auto(sc_p sc); 152 static void nglmi_startup(sc_p sc); 153 static void nglmi_inquire(sc_p sc, int full); 154 static void ngauto_state_machine(sc_p sc); 155 156 /* 157 * Values for 'flags' field 158 * NB: the SCF_CONNECTED flag is set if and only if the timer is running. 159 */ 160 #define SCF_CONNECTED 0x01 /* connected to something */ 161 #define SCF_AUTO 0x02 /* we are auto-detecting */ 162 #define SCF_FIXED 0x04 /* we are fixed from the start */ 163 164 #define SCF_LMITYPE 0x18 /* mask for determining Annex mode */ 165 #define SCF_NOLMI 0x00 /* no LMI type selected yet */ 166 #define SCF_ANNEX_A 0x08 /* running annex A mode */ 167 #define SCF_ANNEX_D 0x10 /* running annex D mode */ 168 #define SCF_GROUP4 0x18 /* running group of 4 */ 169 170 #define SETLMITYPE(sc, annex) \ 171 do { \ 172 (sc)->flags &= ~SCF_LMITYPE; \ 173 (sc)->flags |= (annex); \ 174 } while (0) 175 176 #define NOPROTO(sc) (((sc)->flags & SCF_LMITYPE) == SCF_NOLMI) 177 #define ANNEXA(sc) (((sc)->flags & SCF_LMITYPE) == SCF_ANNEX_A) 178 #define ANNEXD(sc) (((sc)->flags & SCF_LMITYPE) == SCF_ANNEX_D) 179 #define GROUP4(sc) (((sc)->flags & SCF_LMITYPE) == SCF_GROUP4) 180 181 #define LMIPOLLSIZE 3 182 #define LMI_PATIENCE 8 /* declare all DLCI DOWN after N LMI failures */ 183 184 /* 185 * Node constructor 186 */ 187 static int 188 nglmi_constructor(node_p *nodep) 189 { 190 sc_p sc; 191 int error = 0; 192 193 MALLOC(sc, sc_p, sizeof(*sc), M_NETGRAPH, M_NOWAIT); 194 if (sc == NULL) 195 return (ENOMEM); 196 bzero(sc, sizeof(*sc)); 197 198 callout_handle_init(&sc->handle); 199 if ((error = ng_make_node_common(&typestruct, nodep))) { 200 FREE(sc, M_NETGRAPH); 201 return (error); 202 } 203 (*nodep)->private = sc; 204 sc->protoname = NAME_NONE; 205 sc->node = *nodep; 206 sc->liv_per_full = NG_LMI_SEQ_PER_FULL; /* make this dynamic */ 207 sc->liv_rate = NG_LMI_KEEPALIVE_RATE; 208 return (0); 209 } 210 211 /* 212 * The LMI channel has a private pointer which is the same as the 213 * node private pointer. The debug channel has a NULL private pointer. 214 */ 215 static int 216 nglmi_newhook(node_p node, hook_p hook, const char *name) 217 { 218 sc_p sc = node->private; 219 220 if (strcmp(name, NG_LMI_HOOK_DEBUG) == 0) { 221 hook->private = NULL; 222 return (0); 223 } 224 if (sc->flags & SCF_CONNECTED) { 225 /* already connected, return an error */ 226 return (EINVAL); 227 } 228 if (strcmp(name, NG_LMI_HOOK_ANNEXA) == 0) { 229 sc->lmi_annexA = hook; 230 hook->private = node->private; 231 sc->protoID = 8; 232 SETLMITYPE(sc, SCF_ANNEX_A); 233 sc->protoname = NAME_ANNEXA; 234 nglmi_startup_fixed(sc, hook); 235 } else if (strcmp(name, NG_LMI_HOOK_ANNEXD) == 0) { 236 sc->lmi_annexD = hook; 237 hook->private = node->private; 238 sc->protoID = 8; 239 SETLMITYPE(sc, SCF_ANNEX_D); 240 sc->protoname = NAME_ANNEXD; 241 nglmi_startup_fixed(sc, hook); 242 } else if (strcmp(name, NG_LMI_HOOK_GROUPOF4) == 0) { 243 sc->lmi_group4 = hook; 244 hook->private = node->private; 245 sc->protoID = 9; 246 SETLMITYPE(sc, SCF_GROUP4); 247 sc->protoname = NAME_GROUP4; 248 nglmi_startup_fixed(sc, hook); 249 } else if (strcmp(name, NG_LMI_HOOK_AUTO0) == 0) { 250 /* Note this, and if B is already installed, we're complete */ 251 sc->lmi_channel0 = hook; 252 sc->protoname = NAME_NONE; 253 hook->private = node->private; 254 if (sc->lmi_channel1023) 255 nglmi_startup_auto(sc); 256 } else if (strcmp(name, NG_LMI_HOOK_AUTO1023) == 0) { 257 /* Note this, and if A is already installed, we're complete */ 258 sc->lmi_channel1023 = hook; 259 sc->protoname = NAME_NONE; 260 hook->private = node->private; 261 if (sc->lmi_channel0) 262 nglmi_startup_auto(sc); 263 } else 264 return (EINVAL); /* unknown hook */ 265 return (0); 266 } 267 268 /* 269 * We have just attached to a live (we hope) node. 270 * Fire out a LMI inquiry, and then start up the timers. 271 */ 272 static void 273 LMI_ticker(void *arg) 274 { 275 sc_p sc = arg; 276 int s = splnet(); 277 278 if (sc->flags & SCF_AUTO) { 279 ngauto_state_machine(sc); 280 sc->handle = timeout(LMI_ticker, sc, NG_LMI_POLL_RATE * hz); 281 } else { 282 if (sc->livs++ >= sc->liv_per_full) { 283 nglmi_inquire(sc, 1); 284 /* sc->livs = 0; *//* do this when we get the answer! */ 285 } else { 286 nglmi_inquire(sc, 0); 287 } 288 sc->handle = timeout(LMI_ticker, sc, sc->liv_rate * hz); 289 } 290 splx(s); 291 } 292 293 static void 294 nglmi_startup_fixed(sc_p sc, hook_p hook) 295 { 296 sc->flags |= (SCF_FIXED | SCF_CONNECTED); 297 sc->lmi_channel = hook; 298 nglmi_startup(sc); 299 } 300 301 static void 302 nglmi_startup_auto(sc_p sc) 303 { 304 sc->flags |= (SCF_AUTO | SCF_CONNECTED); 305 sc->poll_state = 0; /* reset state machine */ 306 sc->poll_count = 0; 307 nglmi_startup(sc); 308 } 309 310 static void 311 nglmi_startup(sc_p sc) 312 { 313 sc->remote_seq = 0; 314 sc->local_seq = 1; 315 sc->seq_retries = 0; 316 sc->livs = sc->liv_per_full - 1; 317 /* start off the ticker in 1 sec */ 318 sc->handle = timeout(LMI_ticker, sc, hz); 319 } 320 321 #define META_PAD 16 322 static void 323 nglmi_inquire(sc_p sc, int full) 324 { 325 struct mbuf *m; 326 char *cptr, *start; 327 int error; 328 meta_p meta = NULL; 329 330 if (sc->lmi_channel == NULL) 331 return; 332 MGETHDR(m, M_DONTWAIT, MT_DATA); 333 if (m == NULL) { 334 log(LOG_ERR, "nglmi: unable to start up LMI processing\n"); 335 return; 336 } 337 m->m_pkthdr.rcvif = NULL; 338 /* Allocate a meta struct (and leave some slop for options to be 339 * added by other modules). */ 340 /* MALLOC(meta, meta_p, sizeof( struct ng_meta) + META_PAD, 341 * M_NETGRAPH, M_NOWAIT); */ 342 MALLOC(meta, meta_p, sizeof(*meta) + META_PAD, M_NETGRAPH, M_NOWAIT); 343 if (meta != NULL) { /* if it failed, well, it was optional anyhow */ 344 meta->used_len = (u_short) sizeof(struct ng_meta); 345 meta->allocated_len 346 = (u_short) sizeof(struct ng_meta) + META_PAD; 347 meta->flags = 0; 348 meta->priority = NG_LMI_LMI_PRIORITY; 349 meta->discardability = -1; 350 } 351 m->m_data += 4; /* leave some room for a header */ 352 cptr = start = mtod(m, char *); 353 /* add in the header for an LMI inquiry. */ 354 *cptr++ = 0x03; /* UI frame */ 355 if (GROUP4(sc)) 356 *cptr++ = 0x09; /* proto discriminator */ 357 else 358 *cptr++ = 0x08; /* proto discriminator */ 359 *cptr++ = 0x00; /* call reference */ 360 *cptr++ = 0x75; /* inquiry */ 361 362 /* If we are Annex-D, there is this extra thing.. */ 363 if (ANNEXD(sc)) 364 *cptr++ = 0x95; /* ??? */ 365 /* Add a request type */ 366 if (ANNEXA(sc)) 367 *cptr++ = 0x51; /* report type */ 368 else 369 *cptr++ = 0x01; /* report type */ 370 *cptr++ = 0x01; /* size = 1 */ 371 if (full) 372 *cptr++ = 0x00; /* full */ 373 else 374 *cptr++ = 0x01; /* partial */ 375 376 /* Add a link verification IE */ 377 if (ANNEXA(sc)) 378 *cptr++ = 0x53; /* verification IE */ 379 else 380 *cptr++ = 0x03; /* verification IE */ 381 *cptr++ = 0x02; /* 2 extra bytes */ 382 *cptr++ = sc->local_seq; 383 *cptr++ = sc->remote_seq; 384 sc->seq_retries++; 385 386 /* Send it */ 387 m->m_len = m->m_pkthdr.len = cptr - start; 388 NG_SEND_DATA(error, sc->lmi_channel, m, meta); 389 390 /* If we've been sending requests for long enough, and there has 391 * been no response, then mark as DOWN, any DLCIs that are UP. */ 392 if (sc->seq_retries == LMI_PATIENCE) { 393 int count; 394 395 for (count = 0; count < MAXDLCI; count++) 396 if (sc->dlci_state[count] == DLCI_UP) 397 sc->dlci_state[count] = DLCI_DOWN; 398 } 399 } 400 401 /* 402 * State machine for LMI auto-detect. The transitions are ordered 403 * to try the more likely possibilities first. 404 */ 405 static void 406 ngauto_state_machine(sc_p sc) 407 { 408 if ((sc->poll_count <= 0) || (sc->poll_count > LMIPOLLSIZE)) { 409 /* time to change states in the auto probe machine */ 410 /* capture wild values of poll_count while we are at it */ 411 sc->poll_count = LMIPOLLSIZE; 412 sc->poll_state++; 413 } 414 switch (sc->poll_state) { 415 case 7: 416 log(LOG_WARNING, "nglmi: no response from exchange\n"); 417 default: /* capture bad states */ 418 sc->poll_state = 1; 419 case 1: 420 sc->lmi_channel = sc->lmi_channel0; 421 SETLMITYPE(sc, SCF_ANNEX_D); 422 break; 423 case 2: 424 sc->lmi_channel = sc->lmi_channel1023; 425 SETLMITYPE(sc, SCF_ANNEX_D); 426 break; 427 case 3: 428 sc->lmi_channel = sc->lmi_channel0; 429 SETLMITYPE(sc, SCF_ANNEX_A); 430 break; 431 case 4: 432 sc->lmi_channel = sc->lmi_channel1023; 433 SETLMITYPE(sc, SCF_GROUP4); 434 break; 435 case 5: 436 sc->lmi_channel = sc->lmi_channel1023; 437 SETLMITYPE(sc, SCF_ANNEX_A); 438 break; 439 case 6: 440 sc->lmi_channel = sc->lmi_channel0; 441 SETLMITYPE(sc, SCF_GROUP4); 442 break; 443 } 444 445 /* send an inquirey encoded appropriatly */ 446 nglmi_inquire(sc, 0); 447 sc->poll_count--; 448 } 449 450 /* 451 * Receive a netgraph control message. 452 */ 453 static int 454 nglmi_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, 455 struct ng_mesg **resp) 456 { 457 int error = 0; 458 sc_p sc = node->private; 459 460 switch (msg->header.typecookie) { 461 case NGM_GENERIC_COOKIE: 462 switch (msg->header.cmd) { 463 case NGM_TEXT_STATUS: 464 { 465 char *arg; 466 int pos, count; 467 468 NG_MKRESPONSE(*resp, msg, NG_TEXTRESPONSE, M_NOWAIT); 469 if (*resp == NULL) { 470 error = ENOMEM; 471 break; 472 } 473 arg = (*resp)->data; 474 pos = sprintf(arg, "protocol %s ", sc->protoname); 475 if (sc->flags & SCF_FIXED) 476 pos += sprintf(arg + pos, "fixed\n"); 477 else if (sc->flags & SCF_AUTO) 478 pos += sprintf(arg + pos, "auto-detecting\n"); 479 else 480 pos += sprintf(arg + pos, "auto on dlci %d\n", 481 (sc->lmi_channel == sc->lmi_channel0) ? 482 0 : 1023); 483 pos += sprintf(arg + pos, 484 "keepalive period: %d seconds\n", sc->liv_rate); 485 pos += sprintf(arg + pos, 486 "unacknowledged keepalives: %ld\n", 487 sc->seq_retries); 488 for (count = 0; 489 ((count <= MAXDLCI) 490 && (pos < (NG_TEXTRESPONSE - 20))); 491 count++) { 492 if (sc->dlci_state[count]) { 493 pos += sprintf(arg + pos, 494 "dlci %d %s\n", count, 495 (sc->dlci_state[count] 496 == DLCI_UP) ? "up" : "down"); 497 } 498 } 499 (*resp)->header.arglen = pos + 1; 500 break; 501 } 502 default: 503 error = EINVAL; 504 break; 505 } 506 break; 507 case NGM_LMI_COOKIE: 508 switch (msg->header.cmd) { 509 case NGM_LMI_GET_STATUS: 510 { 511 struct nglmistat *stat; 512 int k; 513 514 NG_MKRESPONSE(*resp, msg, sizeof(*stat), M_NOWAIT); 515 if (!*resp) { 516 error = ENOMEM; 517 break; 518 } 519 stat = (struct nglmistat *) (*resp)->data; 520 strncpy(stat->proto, 521 sc->protoname, sizeof(stat->proto) - 1); 522 strncpy(stat->hook, 523 sc->protoname, sizeof(stat->hook) - 1); 524 stat->autod = !!(sc->flags & SCF_AUTO); 525 stat->fixed = !!(sc->flags & SCF_FIXED); 526 for (k = 0; k <= MAXDLCI; k++) { 527 switch (sc->dlci_state[k]) { 528 case DLCI_UP: 529 stat->up[k / 8] |= (1 << (k % 8)); 530 /* fall through */ 531 case DLCI_DOWN: 532 stat->seen[k / 8] |= (1 << (k % 8)); 533 break; 534 } 535 } 536 break; 537 } 538 default: 539 error = EINVAL; 540 break; 541 } 542 break; 543 default: 544 error = EINVAL; 545 break; 546 } 547 FREE(msg, M_NETGRAPH); 548 return (error); 549 } 550 551 #define STEPBY(stepsize) \ 552 do { \ 553 packetlen -= (stepsize); \ 554 data += (stepsize); \ 555 } while (0) 556 557 /* 558 * receive data, and use it to update our status. 559 * Anything coming in on the debug port is discarded. 560 */ 561 static int 562 nglmi_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) 563 { 564 sc_p sc = hook->node->private; 565 const u_char *data; 566 unsigned short dlci; 567 u_short packetlen; 568 int resptype_seen = 0; 569 int seq_seen = 0; 570 571 if (hook->private == NULL) { 572 goto drop; 573 } 574 packetlen = m->m_hdr.mh_len; 575 576 /* XXX what if it's more than 1 mbuf? */ 577 if ((packetlen > MHLEN) && !(m->m_flags & M_EXT)) { 578 log(LOG_WARNING, "nglmi: packetlen (%d) too big\n", packetlen); 579 goto drop; 580 } 581 if (m->m_len < packetlen && (m = m_pullup(m, packetlen)) == NULL) { 582 log(LOG_WARNING, 583 "nglmi: m_pullup failed for %d bytes\n", packetlen); 584 NG_FREE_META(meta); 585 return (0); 586 } 587 if (nglmi_checkdata(hook, m, meta) == 0) 588 return (0); 589 590 /* pass the first 4 bytes (already checked in the nglmi_checkdata()) */ 591 data = mtod(m, const u_char *); 592 STEPBY(4); 593 594 /* Now check if there is a 'locking shift'. This is only seen in 595 * Annex D frames. don't bother checking, we already did that. Don't 596 * increment immediatly as it might not be there. */ 597 if (ANNEXD(sc)) 598 STEPBY(1); 599 600 /* If we get this far we should consider that it is a legitimate 601 * frame and we know what it is. */ 602 if (sc->flags & SCF_AUTO) { 603 /* note the hook that this valid channel came from and drop 604 * out of auto probe mode. */ 605 if (ANNEXA(sc)) 606 sc->protoname = NAME_ANNEXA; 607 else if (ANNEXD(sc)) 608 sc->protoname = NAME_ANNEXD; 609 else if (GROUP4(sc)) 610 sc->protoname = NAME_GROUP4; 611 else { 612 log(LOG_ERR, "nglmi: No known type\n"); 613 goto drop; 614 } 615 sc->lmi_channel = hook; 616 sc->flags &= ~SCF_AUTO; 617 log(LOG_INFO, "nglmi: auto-detected %s LMI on DLCI %d\n", 618 sc->protoname, hook == sc->lmi_channel0 ? 0 : 1023); 619 } 620 621 /* While there is more data in the status packet, keep processing 622 * status items. First make sure there is enough data for the 623 * segment descriptor's length field. */ 624 while (packetlen >= 2) { 625 u_int segtype = data[0]; 626 u_int segsize = data[1]; 627 628 /* Now that we know how long it claims to be, make sure 629 * there is enough data for the next seg. */ 630 if (packetlen < segsize + 2) 631 break; 632 switch (segtype) { 633 case 0x01: 634 case 0x51: 635 if (resptype_seen) { 636 log(LOG_WARNING, "nglmi: dup MSGTYPE\n"); 637 goto nextIE; 638 } 639 resptype_seen++; 640 /* The remote end tells us what kind of response 641 * this is. Only expect a type 0 or 1. if we are a 642 * full status, invalidate a few DLCIs just to see 643 * that they are still ok. */ 644 if (segsize != 1) 645 goto nextIE; 646 switch (data[2]) { 647 case 1: 648 /* partial status, do no extra processing */ 649 break; 650 case 0: 651 { 652 int count = 0; 653 int idx = sc->invalidx; 654 655 for (count = 0; count < 10; count++) { 656 if (idx > MAXDLCI) 657 idx = 0; 658 if (sc->dlci_state[idx] == DLCI_UP) 659 sc->dlci_state[idx] = DLCI_DOWN; 660 idx++; 661 } 662 sc->invalidx = idx; 663 /* we got and we wanted one. relax 664 * now.. but don't reset to 0 if it 665 * was unrequested. */ 666 if (sc->livs > sc->liv_per_full) 667 sc->livs = 0; 668 break; 669 } 670 } 671 break; 672 case 0x03: 673 case 0x53: 674 /* The remote tells us what it thinks the sequence 675 * numbers are. If it's not size 2, it must be a 676 * duplicate to have gotten this far, skip it. */ 677 if (seq_seen != 0) /* already seen seq numbers */ 678 goto nextIE; 679 if (segsize != 2) 680 goto nextIE; 681 sc->remote_seq = data[2]; 682 if (sc->local_seq == data[3]) { 683 sc->local_seq++; 684 sc->seq_retries = 0; 685 /* Note that all 3 Frame protocols seem to 686 * not like 0 as a sequence number. */ 687 if (sc->local_seq == 0) 688 sc->local_seq = 1; 689 } 690 break; 691 case 0x07: 692 case 0x57: 693 /* The remote tells us about a DLCI that it knows 694 * about. There may be many of these in a single 695 * status response */ 696 switch (segsize) { 697 case 6:/* only on 'group of 4' */ 698 dlci = ((u_short) data[2] & 0xff) << 8; 699 dlci |= (data[3] & 0xff); 700 if ((dlci < 1024) && (dlci > 0)) { 701 /* XXX */ 702 } 703 break; 704 case 3: 705 dlci = ((u_short) data[2] & 0x3f) << 4; 706 dlci |= ((data[3] & 0x78) >> 3); 707 if ((dlci < 1024) && (dlci > 0)) { 708 /* set up the bottom half of the 709 * support for that dlci if it's not 710 * already been done */ 711 /* store this information somewhere */ 712 } 713 break; 714 default: 715 goto nextIE; 716 } 717 if (sc->dlci_state[dlci] != DLCI_UP) { 718 /* bring new DLCI to life */ 719 /* may do more here some day */ 720 if (sc->dlci_state[dlci] != DLCI_DOWN) 721 log(LOG_INFO, 722 "nglmi: DLCI %d became active\n", 723 dlci); 724 sc->dlci_state[dlci] = DLCI_UP; 725 } 726 break; 727 } 728 nextIE: 729 STEPBY(segsize + 2); 730 } 731 NG_FREE_DATA(m, meta); 732 return (0); 733 734 drop: 735 NG_FREE_DATA(m, meta); 736 return (EINVAL); 737 } 738 739 /* 740 * Check that a packet is entirely kosha. 741 * return 1 of ok, and 0 if not. 742 * All data is discarded if a 0 is returned. 743 */ 744 static int 745 nglmi_checkdata(hook_p hook, struct mbuf *m, meta_p meta) 746 { 747 sc_p sc = hook->node->private; 748 const u_char *data; 749 u_short packetlen; 750 unsigned short dlci; 751 u_char type; 752 u_char nextbyte; 753 int seq_seen = 0; 754 int resptype_seen = 0; /* 0 , 1 (partial) or 2 (full) */ 755 int highest_dlci = 0; 756 757 packetlen = m->m_hdr.mh_len; 758 data = mtod(m, const u_char *); 759 if (*data != 0x03) { 760 log(LOG_WARNING, "nglmi: unexpected value in LMI(%d)\n", 1); 761 goto reject; 762 } 763 STEPBY(1); 764 765 /* look at the protocol ID */ 766 nextbyte = *data; 767 if (sc->flags & SCF_AUTO) { 768 SETLMITYPE(sc, SCF_NOLMI); /* start with a clean slate */ 769 switch (nextbyte) { 770 case 0x8: 771 sc->protoID = 8; 772 break; 773 case 0x9: 774 SETLMITYPE(sc, SCF_GROUP4); 775 sc->protoID = 9; 776 break; 777 default: 778 log(LOG_WARNING, "nglmi: bad Protocol ID(%d)\n", 779 (int) nextbyte); 780 goto reject; 781 } 782 } else { 783 if (nextbyte != sc->protoID) { 784 log(LOG_WARNING, "nglmi: unexpected Protocol ID(%d)\n", 785 (int) nextbyte); 786 goto reject; 787 } 788 } 789 STEPBY(1); 790 791 /* check call reference (always null in non ISDN frame relay) */ 792 if (*data != 0x00) { 793 log(LOG_WARNING, "nglmi: unexpected Call Reference (0x%x)\n", 794 data[-1]); 795 goto reject; 796 } 797 STEPBY(1); 798 799 /* check message type */ 800 switch ((type = *data)) { 801 case 0x75: /* Status enquiry */ 802 log(LOG_WARNING, "nglmi: unexpected message type(0x%x)\n", 803 data[-1]); 804 goto reject; 805 case 0x7D: /* Status message */ 806 break; 807 default: 808 log(LOG_WARNING, 809 "nglmi: unexpected msg type(0x%x) \n", (int) type); 810 goto reject; 811 } 812 STEPBY(1); 813 814 /* Now check if there is a 'locking shift'. This is only seen in 815 * Annex D frames. Don't increment immediately as it might not be 816 * there. */ 817 nextbyte = *data; 818 if (sc->flags & SCF_AUTO) { 819 if (!(GROUP4(sc))) { 820 if (nextbyte == 0x95) { 821 SETLMITYPE(sc, SCF_ANNEX_D); 822 STEPBY(1); 823 } else 824 SETLMITYPE(sc, SCF_ANNEX_A); 825 } else if (nextbyte == 0x95) { 826 log(LOG_WARNING, "nglmi: locking shift seen in G4\n"); 827 goto reject; 828 } 829 } else { 830 if (ANNEXD(sc)) { 831 if (*data == 0x95) 832 STEPBY(1); 833 else { 834 log(LOG_WARNING, 835 "nglmi: locking shift missing\n"); 836 goto reject; 837 } 838 } else if (*data == 0x95) { 839 log(LOG_WARNING, "nglmi: locking shift seen\n"); 840 goto reject; 841 } 842 } 843 844 /* While there is more data in the status packet, keep processing 845 * status items. First make sure there is enough data for the 846 * segment descriptor's length field. */ 847 while (packetlen >= 2) { 848 u_int segtype = data[0]; 849 u_int segsize = data[1]; 850 851 /* Now that we know how long it claims to be, make sure 852 * there is enough data for the next seg. */ 853 if (packetlen < (segsize + 2)) { 854 log(LOG_WARNING, "nglmi: IE longer than packet\n"); 855 break; 856 } 857 switch (segtype) { 858 case 0x01: 859 case 0x51: 860 /* According to MCI's HP analyser, we should just 861 * ignore if there is mor ethan one of these (?). */ 862 if (resptype_seen) { 863 log(LOG_WARNING, "nglmi: dup MSGTYPE\n"); 864 goto nextIE; 865 } 866 if (segsize != 1) { 867 log(LOG_WARNING, "nglmi: MSGTYPE wrong size\n"); 868 goto reject; 869 } 870 /* The remote end tells us what kind of response 871 * this is. Only expect a type 0 or 1. if it was a 872 * full (type 0) check we just asked for a type 873 * full. */ 874 switch (data[2]) { 875 case 1:/* partial */ 876 if (sc->livs > sc->liv_per_full) { 877 log(LOG_WARNING, 878 "nglmi: LIV when FULL expected\n"); 879 goto reject; /* need full */ 880 } 881 resptype_seen = 1; 882 break; 883 case 0:/* full */ 884 /* Full response is always acceptable */ 885 resptype_seen = 2; 886 break; 887 default: 888 log(LOG_WARNING, 889 "nglmi: Unknown report type %d\n", data[2]); 890 goto reject; 891 } 892 break; 893 case 0x03: 894 case 0x53: 895 /* The remote tells us what it thinks the sequence 896 * numbers are. I would have thought that there 897 * needs to be one and only one of these, but MCI 898 * want us to just ignore extras. (?) */ 899 if (resptype_seen == 0) { 900 log(LOG_WARNING, "nglmi: no TYPE before SEQ\n"); 901 goto reject; 902 } 903 if (seq_seen != 0) /* already seen seq numbers */ 904 goto nextIE; 905 if (segsize != 2) { 906 log(LOG_WARNING, "nglmi: bad SEQ sts size\n"); 907 goto reject; 908 } 909 if (sc->local_seq != data[3]) { 910 log(LOG_WARNING, "nglmi: unexpected SEQ\n"); 911 goto reject; 912 } 913 seq_seen = 1; 914 break; 915 case 0x07: 916 case 0x57: 917 /* The remote tells us about a DLCI that it knows 918 * about. There may be many of these in a single 919 * status response */ 920 if (seq_seen != 1) { /* already seen seq numbers? */ 921 log(LOG_WARNING, 922 "nglmi: No sequence before DLCI\n"); 923 goto reject; 924 } 925 if (resptype_seen != 2) { /* must be full */ 926 log(LOG_WARNING, 927 "nglmi: No resp type before DLCI\n"); 928 goto reject; 929 } 930 if (GROUP4(sc)) { 931 if (segsize != 6) { 932 log(LOG_WARNING, 933 "nglmi: wrong IE segsize\n"); 934 goto reject; 935 } 936 dlci = ((u_short) data[2] & 0xff) << 8; 937 dlci |= (data[3] & 0xff); 938 } else { 939 if (segsize != 3) { 940 log(LOG_WARNING, 941 "nglmi: DLCI headersize of %d" 942 " not supported\n", segsize - 1); 943 goto reject; 944 } 945 dlci = ((u_short) data[2] & 0x3f) << 4; 946 dlci |= ((data[3] & 0x78) >> 3); 947 } 948 /* async can only have one of these */ 949 #if 0 /* async not yet accepted */ 950 if (async && highest_dlci) { 951 log(LOG_WARNING, 952 "nglmi: Async with > 1 DLCI\n"); 953 goto reject; 954 } 955 #endif 956 /* Annex D says these will always be Ascending, but 957 * the HP test for G4 says we should accept 958 * duplicates, so for now allow that. ( <= vs. < ) */ 959 #if 0 960 /* MCI tests want us to accept out of order for AnxD */ 961 if ((!GROUP4(sc)) && (dlci < highest_dlci)) { 962 /* duplicate or mis-ordered dlci */ 963 /* (spec says they will increase in number) */ 964 log(LOG_WARNING, "nglmi: DLCI out of order\n"); 965 goto reject; 966 } 967 #endif 968 if (dlci > 1023) { 969 log(LOG_WARNING, "nglmi: DLCI out of range\n"); 970 goto reject; 971 } 972 highest_dlci = dlci; 973 break; 974 default: 975 log(LOG_WARNING, 976 "nglmi: unknown LMI segment type %d\n", segtype); 977 } 978 nextIE: 979 STEPBY(segsize + 2); 980 } 981 if (packetlen != 0) { /* partial junk at end? */ 982 log(LOG_WARNING, 983 "nglmi: %d bytes extra at end of packet\n", packetlen); 984 goto print; 985 } 986 if (resptype_seen == 0) { 987 log(LOG_WARNING, "nglmi: No response type seen\n"); 988 goto reject; /* had no response type */ 989 } 990 if (seq_seen == 0) { 991 log(LOG_WARNING, "nglmi: No sequence numbers seen\n"); 992 goto reject; /* had no sequence numbers */ 993 } 994 return (1); 995 996 print: 997 { 998 int i, j, k, pos; 999 char buf[100]; 1000 int loc; 1001 const u_char *bp = mtod(m, const u_char *); 1002 1003 k = i = 0; 1004 loc = (m->m_hdr.mh_len - packetlen); 1005 log(LOG_WARNING, "nglmi: error at location %d\n", loc); 1006 while (k < m->m_hdr.mh_len) { 1007 pos = 0; 1008 j = 0; 1009 while ((j++ < 16) && k < m->m_hdr.mh_len) { 1010 pos += sprintf(buf + pos, "%c%02x", 1011 ((loc == k) ? '>' : ' '), 1012 bp[k]); 1013 k++; 1014 } 1015 if (i == 0) 1016 log(LOG_WARNING, "nglmi: packet data:%s\n", buf); 1017 else 1018 log(LOG_WARNING, "%04d :%s\n", k, buf); 1019 i++; 1020 } 1021 } 1022 return (1); 1023 reject: 1024 { 1025 int i, j, k, pos; 1026 char buf[100]; 1027 int loc; 1028 const u_char *bp = mtod(m, const u_char *); 1029 1030 k = i = 0; 1031 loc = (m->m_hdr.mh_len - packetlen); 1032 log(LOG_WARNING, "nglmi: error at location %d\n", loc); 1033 while (k < m->m_hdr.mh_len) { 1034 pos = 0; 1035 j = 0; 1036 while ((j++ < 16) && k < m->m_hdr.mh_len) { 1037 pos += sprintf(buf + pos, "%c%02x", 1038 ((loc == k) ? '>' : ' '), 1039 bp[k]); 1040 k++; 1041 } 1042 if (i == 0) 1043 log(LOG_WARNING, "nglmi: packet data:%s\n", buf); 1044 else 1045 log(LOG_WARNING, "%04d :%s\n", k, buf); 1046 i++; 1047 } 1048 } 1049 NG_FREE_DATA(m, meta); 1050 return (0); 1051 } 1052 1053 /* 1054 * Do local shutdown processing.. 1055 * Cut any remaining links and free our local resources. 1056 */ 1057 static int 1058 nglmi_rmnode(node_p node) 1059 { 1060 const sc_p sc = node->private; 1061 1062 node->flags |= NG_INVALID; 1063 ng_cutlinks(node); 1064 ng_unname(node); 1065 node->private = NULL; 1066 ng_unref(sc->node); 1067 FREE(sc, M_NETGRAPH); 1068 return (0); 1069 } 1070 1071 /* 1072 * Hook disconnection 1073 * For this type, removal of any link except "debug" destroys the node. 1074 */ 1075 static int 1076 nglmi_disconnect(hook_p hook) 1077 { 1078 const sc_p sc = hook->node->private; 1079 1080 /* OK to remove debug hook(s) */ 1081 if (hook->private == NULL) 1082 return (0); 1083 1084 /* Stop timer if it's currently active */ 1085 if (sc->flags & SCF_CONNECTED) 1086 untimeout(LMI_ticker, sc, sc->handle); 1087 1088 /* Self-destruct */ 1089 ng_rmnode(hook->node); 1090 return (0); 1091 } 1092
Cache object: 3cac453ca6a4d647d3b5ef66651023e7
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