1/* 2 * ng_lmi.c 3 */ 4 5/*- 6 * Copyright (c) 1996-1999 Whistle Communications, Inc. 7 * All rights reserved. 8 * 9 * Subject to the following obligations and disclaimer of warranty, use and 10 * redistribution of this software, in source or object code forms, with or 11 * without modifications are expressly permitted by Whistle Communications; 12 * provided, however, that: 13 * 1. Any and all reproductions of the source or object code must include the 14 * copyright notice above and the following disclaimer of warranties; and 15 * 2. No rights are granted, in any manner or form, to use Whistle 16 * Communications, Inc. trademarks, including the mark "WHISTLE 17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18 * such appears in the above copyright notice or in the software. 19 * 20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36 * OF SUCH DAMAGE. 37 * 38 * Author: Julian Elischer <julian@freebsd.org> 39 * 40 * $FreeBSD$ 41 * $Whistle: ng_lmi.c,v 1.38 1999/11/01 09:24:52 julian Exp $ 42 */ 43 44/* 45 * This node performs the frame relay LMI protocol. It knows how 46 * to do ITU Annex A, ANSI Annex D, and "Group-of-Four" variants 47 * of the protocol. 48 * 49 * A specific protocol can be forced by connecting the corresponding 50 * hook to DLCI 0 or 1023 (as appropriate) of a frame relay link. 51 * 52 * Alternately, this node can do auto-detection of the LMI protocol 53 * by connecting hook "auto0" to DLCI 0 and "auto1023" to DLCI 1023. 54 */ 55 56#include <sys/param.h> 57#include <sys/systm.h> 58#include <sys/errno.h> 59#include <sys/kernel.h> 60#include <sys/malloc.h> 61#include <sys/mbuf.h> 62#include <sys/syslog.h> 63#include <netgraph/ng_message.h> 64#include <netgraph/netgraph.h> 65#include <netgraph/ng_lmi.h> 66 67/* 68 * Human readable names for LMI 69 */ 70#define NAME_ANNEXA NG_LMI_HOOK_ANNEXA 71#define NAME_ANNEXD NG_LMI_HOOK_ANNEXD 72#define NAME_GROUP4 NG_LMI_HOOK_GROUPOF4 73#define NAME_NONE "None" 74 75#define MAX_DLCIS 128 76#define MAXDLCI 1023 77 78/* 79 * DLCI states 80 */ 81#define DLCI_NULL 0 82#define DLCI_UP 1 83#define DLCI_DOWN 2 84 85/* 86 * Any received LMI frame should be at least this long 87 */ 88#define LMI_MIN_LENGTH 8 /* XXX verify */ 89 90/* 91 * Netgraph node methods and type descriptor 92 */ 93static ng_constructor_t nglmi_constructor; 94static ng_rcvmsg_t nglmi_rcvmsg; 95static ng_shutdown_t nglmi_shutdown; 96static ng_newhook_t nglmi_newhook; 97static ng_rcvdata_t nglmi_rcvdata; 98static ng_disconnect_t nglmi_disconnect; 99static int nglmi_checkdata(hook_p hook, struct mbuf *m); 100 101static struct ng_type typestruct = { 102 .version = NG_ABI_VERSION, 103 .name = NG_LMI_NODE_TYPE, 104 .constructor = nglmi_constructor, 105 .rcvmsg = nglmi_rcvmsg, 106 .shutdown = nglmi_shutdown, 107 .newhook = nglmi_newhook, 108 .rcvdata = nglmi_rcvdata, 109 .disconnect = nglmi_disconnect, 110}; 111NETGRAPH_INIT(lmi, &typestruct); 112 113/* 114 * Info and status per node 115 */ 116struct nglmi_softc { 117 node_p node; /* netgraph node */ 118 int flags; /* state */ 119 int poll_count; /* the count of times for autolmi */ 120 int poll_state; /* state of auto detect machine */ 121 u_char remote_seq; /* sequence number the remote sent */ 122 u_char local_seq; /* last sequence number we sent */ 123 u_char protoID; /* 9 for group of 4, 8 otherwise */ 124 u_long seq_retries; /* sent this how many time so far */ 125 struct callout handle; /* see timeout(9) */ 126 int liv_per_full; 127 int liv_rate; 128 int livs; 129 int need_full; 130 hook_p lmi_channel; /* whatever we ended up using */ 131 hook_p lmi_annexA; 132 hook_p lmi_annexD; 133 hook_p lmi_group4; 134 hook_p lmi_channel0; /* auto-detect on DLCI 0 */ 135 hook_p lmi_channel1023;/* auto-detect on DLCI 1023 */ 136 char *protoname; /* cache protocol name */ 137 u_char dlci_state[MAXDLCI + 1]; 138 int invalidx; /* next dlci's to invalidate */ 139}; 140typedef struct nglmi_softc *sc_p; 141 142/* 143 * Other internal functions 144 */ 145static void LMI_ticker(node_p node, hook_p hook, void *arg1, int arg2); 146static void nglmi_startup_fixed(sc_p sc, hook_p hook); 147static void nglmi_startup_auto(sc_p sc); 148static void nglmi_startup(sc_p sc); 149static void nglmi_inquire(sc_p sc, int full); 150static void ngauto_state_machine(sc_p sc); 151 152/* 153 * Values for 'flags' field 154 * NB: the SCF_CONNECTED flag is set if and only if the timer is running. 155 */ 156#define SCF_CONNECTED 0x01 /* connected to something */ 157#define SCF_AUTO 0x02 /* we are auto-detecting */ 158#define SCF_FIXED 0x04 /* we are fixed from the start */ 159 160#define SCF_LMITYPE 0x18 /* mask for determining Annex mode */ 161#define SCF_NOLMI 0x00 /* no LMI type selected yet */ 162#define SCF_ANNEX_A 0x08 /* running annex A mode */ 163#define SCF_ANNEX_D 0x10 /* running annex D mode */ 164#define SCF_GROUP4 0x18 /* running group of 4 */ 165 166#define SETLMITYPE(sc, annex) \ 167do { \ 168 (sc)->flags &= ~SCF_LMITYPE; \ 169 (sc)->flags |= (annex); \ 170} while (0) 171 172#define NOPROTO(sc) (((sc)->flags & SCF_LMITYPE) == SCF_NOLMI) 173#define ANNEXA(sc) (((sc)->flags & SCF_LMITYPE) == SCF_ANNEX_A) 174#define ANNEXD(sc) (((sc)->flags & SCF_LMITYPE) == SCF_ANNEX_D) 175#define GROUP4(sc) (((sc)->flags & SCF_LMITYPE) == SCF_GROUP4) 176 177#define LMIPOLLSIZE 3 178#define LMI_PATIENCE 8 /* declare all DLCI DOWN after N LMI failures */ 179 180/* 181 * Node constructor 182 */ 183static int 184nglmi_constructor(node_p node) 185{ 186 sc_p sc; 187 188 sc = malloc(sizeof(*sc), M_NETGRAPH, M_WAITOK | M_ZERO); 189 190 NG_NODE_SET_PRIVATE(node, sc); 191 sc->node = node; 192 193 ng_callout_init(&sc->handle); 194 sc->protoname = NAME_NONE; 195 sc->liv_per_full = NG_LMI_SEQ_PER_FULL; /* make this dynamic */ 196 sc->liv_rate = NG_LMI_KEEPALIVE_RATE; 197 return (0); 198} 199 200/* 201 * The LMI channel has a private pointer which is the same as the 202 * node private pointer. The debug channel has a NULL private pointer. 203 */ 204static int 205nglmi_newhook(node_p node, hook_p hook, const char *name) 206{ 207 sc_p sc = NG_NODE_PRIVATE(node); 208 209 if (strcmp(name, NG_LMI_HOOK_DEBUG) == 0) { 210 NG_HOOK_SET_PRIVATE(hook, NULL); 211 return (0); 212 } 213 if (sc->flags & SCF_CONNECTED) { 214 /* already connected, return an error */ 215 return (EINVAL); 216 } 217 if (strcmp(name, NG_LMI_HOOK_ANNEXA) == 0) { 218 sc->lmi_annexA = hook; 219 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 220 sc->protoID = 8; 221 SETLMITYPE(sc, SCF_ANNEX_A); 222 sc->protoname = NAME_ANNEXA; 223 nglmi_startup_fixed(sc, hook); 224 } else if (strcmp(name, NG_LMI_HOOK_ANNEXD) == 0) { 225 sc->lmi_annexD = hook; 226 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 227 sc->protoID = 8; 228 SETLMITYPE(sc, SCF_ANNEX_D); 229 sc->protoname = NAME_ANNEXD; 230 nglmi_startup_fixed(sc, hook); 231 } else if (strcmp(name, NG_LMI_HOOK_GROUPOF4) == 0) { 232 sc->lmi_group4 = hook; 233 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 234 sc->protoID = 9; 235 SETLMITYPE(sc, SCF_GROUP4); 236 sc->protoname = NAME_GROUP4; 237 nglmi_startup_fixed(sc, hook); 238 } else if (strcmp(name, NG_LMI_HOOK_AUTO0) == 0) { 239 /* Note this, and if B is already installed, we're complete */ 240 sc->lmi_channel0 = hook; 241 sc->protoname = NAME_NONE; 242 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 243 if (sc->lmi_channel1023) 244 nglmi_startup_auto(sc); 245 } else if (strcmp(name, NG_LMI_HOOK_AUTO1023) == 0) { 246 /* Note this, and if A is already installed, we're complete */ 247 sc->lmi_channel1023 = hook; 248 sc->protoname = NAME_NONE; 249 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 250 if (sc->lmi_channel0) 251 nglmi_startup_auto(sc); 252 } else 253 return (EINVAL); /* unknown hook */ 254 return (0); 255} 256 257/* 258 * We have just attached to a live (we hope) node. 259 * Fire out a LMI inquiry, and then start up the timers. 260 */ 261static void 262LMI_ticker(node_p node, hook_p hook, void *arg1, int arg2) 263{ 264 sc_p sc = NG_NODE_PRIVATE(node); 265 266 if (sc->flags & SCF_AUTO) { 267 ngauto_state_machine(sc); 268 ng_callout(&sc->handle, node, NULL, NG_LMI_POLL_RATE * hz, 269 LMI_ticker, NULL, 0); 270 } else { 271 if (sc->livs++ >= sc->liv_per_full) { 272 nglmi_inquire(sc, 1); 273 /* sc->livs = 0; *//* do this when we get the answer! */ 274 } else { 275 nglmi_inquire(sc, 0); 276 } 277 ng_callout(&sc->handle, node, NULL, sc->liv_rate * hz, 278 LMI_ticker, NULL, 0); 279 } 280} 281 282static void 283nglmi_startup_fixed(sc_p sc, hook_p hook) 284{ 285 sc->flags |= (SCF_FIXED | SCF_CONNECTED); 286 sc->lmi_channel = hook; 287 nglmi_startup(sc); 288} 289 290static void 291nglmi_startup_auto(sc_p sc) 292{ 293 sc->flags |= (SCF_AUTO | SCF_CONNECTED); 294 sc->poll_state = 0; /* reset state machine */ 295 sc->poll_count = 0; 296 nglmi_startup(sc); 297} 298 299static void 300nglmi_startup(sc_p sc) 301{ 302 sc->remote_seq = 0; 303 sc->local_seq = 1; 304 sc->seq_retries = 0; 305 sc->livs = sc->liv_per_full - 1; 306 /* start off the ticker in 1 sec */ 307 ng_callout(&sc->handle, sc->node, NULL, hz, LMI_ticker, NULL, 0); 308} 309 310static void 311nglmi_inquire(sc_p sc, int full) 312{ 313 struct mbuf *m; 314 struct ng_tag_prio *ptag; 315 char *cptr, *start; 316 int error; 317 318 if (sc->lmi_channel == NULL) 319 return; 320 MGETHDR(m, M_NOWAIT, MT_DATA); 321 if (m == NULL) { 322 log(LOG_ERR, "nglmi: unable to start up LMI processing\n"); 323 return; 324 } 325 m->m_pkthdr.rcvif = NULL; 326 327 /* Attach a tag to packet, marking it of link level state priority, so 328 * that device driver would put it in the beginning of queue */ 329 330 ptag = (struct ng_tag_prio *)m_tag_alloc(NGM_GENERIC_COOKIE, NG_TAG_PRIO, 331 (sizeof(struct ng_tag_prio) - sizeof(struct m_tag)), M_NOWAIT); 332 if (ptag != NULL) { /* if it failed, well, it was optional anyhow */ 333 ptag->priority = NG_PRIO_LINKSTATE; 334 ptag->discardability = -1; 335 m_tag_prepend(m, &ptag->tag); 336 } 337 338 m->m_data += 4; /* leave some room for a header */ 339 cptr = start = mtod(m, char *); 340 /* add in the header for an LMI inquiry. */ 341 *cptr++ = 0x03; /* UI frame */ 342 if (GROUP4(sc)) 343 *cptr++ = 0x09; /* proto discriminator */ 344 else 345 *cptr++ = 0x08; /* proto discriminator */ 346 *cptr++ = 0x00; /* call reference */ 347 *cptr++ = 0x75; /* inquiry */ 348 349 /* If we are Annex-D, add locking shift to codeset 5. */ 350 if (ANNEXD(sc)) 351 *cptr++ = 0x95; /* locking shift */ 352 /* Add a request type */ 353 if (ANNEXA(sc)) 354 *cptr++ = 0x51; /* report type */ 355 else 356 *cptr++ = 0x01; /* report type */ 357 *cptr++ = 0x01; /* size = 1 */ 358 if (full) 359 *cptr++ = 0x00; /* full */ 360 else 361 *cptr++ = 0x01; /* partial */ 362 363 /* Add a link verification IE */ 364 if (ANNEXA(sc)) 365 *cptr++ = 0x53; /* verification IE */ 366 else 367 *cptr++ = 0x03; /* verification IE */ 368 *cptr++ = 0x02; /* 2 extra bytes */ 369 *cptr++ = sc->local_seq; 370 *cptr++ = sc->remote_seq; 371 sc->seq_retries++; 372 373 /* Send it */ 374 m->m_len = m->m_pkthdr.len = cptr - start; 375 NG_SEND_DATA_ONLY(error, sc->lmi_channel, m); 376 377 /* If we've been sending requests for long enough, and there has 378 * been no response, then mark as DOWN, any DLCIs that are UP. */ 379 if (sc->seq_retries == LMI_PATIENCE) { 380 int count; 381 382 for (count = 0; count < MAXDLCI; count++) 383 if (sc->dlci_state[count] == DLCI_UP) 384 sc->dlci_state[count] = DLCI_DOWN; 385 } 386} 387 388/* 389 * State machine for LMI auto-detect. The transitions are ordered 390 * to try the more likely possibilities first. 391 */ 392static void 393ngauto_state_machine(sc_p sc) 394{ 395 if ((sc->poll_count <= 0) || (sc->poll_count > LMIPOLLSIZE)) { 396 /* time to change states in the auto probe machine */ 397 /* capture wild values of poll_count while we are at it */ 398 sc->poll_count = LMIPOLLSIZE; 399 sc->poll_state++; 400 } 401 switch (sc->poll_state) { 402 case 7: 403 log(LOG_WARNING, "nglmi: no response from exchange\n"); 404 default: /* capture bad states */ 405 sc->poll_state = 1; 406 case 1: 407 sc->lmi_channel = sc->lmi_channel0; 408 SETLMITYPE(sc, SCF_ANNEX_D); 409 break; 410 case 2: 411 sc->lmi_channel = sc->lmi_channel1023; 412 SETLMITYPE(sc, SCF_ANNEX_D); 413 break; 414 case 3: 415 sc->lmi_channel = sc->lmi_channel0; 416 SETLMITYPE(sc, SCF_ANNEX_A); 417 break; 418 case 4: 419 sc->lmi_channel = sc->lmi_channel1023; 420 SETLMITYPE(sc, SCF_GROUP4); 421 break; 422 case 5: 423 sc->lmi_channel = sc->lmi_channel1023; 424 SETLMITYPE(sc, SCF_ANNEX_A); 425 break; 426 case 6: 427 sc->lmi_channel = sc->lmi_channel0; 428 SETLMITYPE(sc, SCF_GROUP4); 429 break; 430 } 431 432 /* send an inquirey encoded appropriatly */ 433 nglmi_inquire(sc, 0); 434 sc->poll_count--; 435} 436 437/* 438 * Receive a netgraph control message. 439 */ 440static int 441nglmi_rcvmsg(node_p node, item_p item, hook_p lasthook) 442{ 443 sc_p sc = NG_NODE_PRIVATE(node); 444 struct ng_mesg *resp = NULL; 445 int error = 0; 446 struct ng_mesg *msg; 447 448 NGI_GET_MSG(item, msg); 449 switch (msg->header.typecookie) { 450 case NGM_GENERIC_COOKIE: 451 switch (msg->header.cmd) { 452 case NGM_TEXT_STATUS: 453 { 454 char *arg; 455 int pos, count; 456 457 NG_MKRESPONSE(resp, msg, NG_TEXTRESPONSE, M_NOWAIT); 458 if (resp == NULL) { 459 error = ENOMEM; 460 break; 461 } 462 arg = resp->data; 463 pos = sprintf(arg, "protocol %s ", sc->protoname); 464 if (sc->flags & SCF_FIXED) 465 pos += sprintf(arg + pos, "fixed\n"); 466 else if (sc->flags & SCF_AUTO) 467 pos += sprintf(arg + pos, "auto-detecting\n"); 468 else 469 pos += sprintf(arg + pos, "auto on dlci %d\n", 470 (sc->lmi_channel == sc->lmi_channel0) ? 471 0 : 1023); 472 pos += sprintf(arg + pos, 473 "keepalive period: %d seconds\n", sc->liv_rate); 474 pos += sprintf(arg + pos, 475 "unacknowledged keepalives: %ld\n", 476 sc->seq_retries); 477 for (count = 0; 478 ((count <= MAXDLCI) 479 && (pos < (NG_TEXTRESPONSE - 20))); 480 count++) { 481 if (sc->dlci_state[count]) { 482 pos += sprintf(arg + pos, 483 "dlci %d %s\n", count, 484 (sc->dlci_state[count] 485 == DLCI_UP) ? "up" : "down"); 486 } 487 } 488 resp->header.arglen = pos + 1; 489 break; 490 } 491 default: 492 error = EINVAL; 493 break; 494 } 495 break; 496 case NGM_LMI_COOKIE: 497 switch (msg->header.cmd) { 498 case NGM_LMI_GET_STATUS: 499 { 500 struct nglmistat *stat; 501 int k; 502 503 NG_MKRESPONSE(resp, msg, sizeof(*stat), M_NOWAIT); 504 if (!resp) { 505 error = ENOMEM; 506 break; 507 } 508 stat = (struct nglmistat *) resp->data; 509 strncpy(stat->proto, 510 sc->protoname, sizeof(stat->proto) - 1); 511 strncpy(stat->hook, 512 sc->protoname, sizeof(stat->hook) - 1); 513 stat->autod = !!(sc->flags & SCF_AUTO); 514 stat->fixed = !!(sc->flags & SCF_FIXED); 515 for (k = 0; k <= MAXDLCI; k++) { 516 switch (sc->dlci_state[k]) { 517 case DLCI_UP: 518 stat->up[k / 8] |= (1 << (k % 8)); 519 /* fall through */ 520 case DLCI_DOWN: 521 stat->seen[k / 8] |= (1 << (k % 8)); 522 break; 523 } 524 } 525 break; 526 } 527 default: 528 error = EINVAL; 529 break; 530 } 531 break; 532 default: 533 error = EINVAL; 534 break; 535 } 536 537 NG_RESPOND_MSG(error, node, item, resp); 538 NG_FREE_MSG(msg); 539 return (error); 540} 541 542#define STEPBY(stepsize) \ 543 do { \ 544 packetlen -= (stepsize); \ 545 data += (stepsize); \ 546 } while (0) 547 548/* 549 * receive data, and use it to update our status. 550 * Anything coming in on the debug port is discarded. 551 */ 552static int 553nglmi_rcvdata(hook_p hook, item_p item) 554{ 555 sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 556 const u_char *data; 557 unsigned short dlci; 558 u_short packetlen; 559 int resptype_seen = 0; 560 struct mbuf *m; 561 562 NGI_GET_M(item, m); 563 NG_FREE_ITEM(item); 564 if (NG_HOOK_PRIVATE(hook) == NULL) { 565 goto drop; 566 } 567 packetlen = m->m_len; 568 569 /* XXX what if it's more than 1 mbuf? */ 570 if ((packetlen > MHLEN) && !(m->m_flags & M_EXT)) { 571 log(LOG_WARNING, "nglmi: packetlen (%d) too big\n", packetlen); 572 goto drop; 573 } 574 if (m->m_len < packetlen && (m = m_pullup(m, packetlen)) == NULL) { 575 log(LOG_WARNING, 576 "nglmi: m_pullup failed for %d bytes\n", packetlen); 577 return (0); 578 } 579 if (nglmi_checkdata(hook, m) == 0) 580 return (0); 581 582 /* pass the first 4 bytes (already checked in the nglmi_checkdata()) */ 583 data = mtod(m, const u_char *); 584 STEPBY(4); 585 586 /* Now check if there is a 'locking shift'. This is only seen in 587 * Annex D frames. don't bother checking, we already did that. Don't 588 * increment immediatly as it might not be there. */ 589 if (ANNEXD(sc)) 590 STEPBY(1); 591 592 /* If we get this far we should consider that it is a legitimate 593 * frame and we know what it is. */ 594 if (sc->flags & SCF_AUTO) { 595 /* note the hook that this valid channel came from and drop 596 * out of auto probe mode. */ 597 if (ANNEXA(sc)) 598 sc->protoname = NAME_ANNEXA; 599 else if (ANNEXD(sc)) 600 sc->protoname = NAME_ANNEXD; 601 else if (GROUP4(sc)) 602 sc->protoname = NAME_GROUP4; 603 else { 604 log(LOG_ERR, "nglmi: No known type\n"); 605 goto drop; 606 } 607 sc->lmi_channel = hook; 608 sc->flags &= ~SCF_AUTO; 609 log(LOG_INFO, "nglmi: auto-detected %s LMI on DLCI %d\n", 610 sc->protoname, hook == sc->lmi_channel0 ? 0 : 1023); 611 } 612 613 /* While there is more data in the status packet, keep processing 614 * status items. First make sure there is enough data for the 615 * segment descriptor's length field. */ 616 while (packetlen >= 2) { 617 u_int segtype = data[0]; 618 u_int segsize = data[1]; 619 620 /* Now that we know how long it claims to be, make sure 621 * there is enough data for the next seg. */ 622 if (packetlen < segsize + 2) 623 break; 624 switch (segtype) { 625 case 0x01: 626 case 0x51: 627 if (resptype_seen) { 628 log(LOG_WARNING, "nglmi: dup MSGTYPE\n"); 629 goto nextIE; 630 } 631 resptype_seen++; 632 /* The remote end tells us what kind of response 633 * this is. Only expect a type 0 or 1. if we are a 634 * full status, invalidate a few DLCIs just to see 635 * that they are still ok. */ 636 if (segsize != 1) 637 goto nextIE; 638 switch (data[2]) { 639 case 1: 640 /* partial status, do no extra processing */ 641 break; 642 case 0: 643 { 644 int count = 0; 645 int idx = sc->invalidx; 646 647 for (count = 0; count < 10; count++) { 648 if (idx > MAXDLCI) 649 idx = 0; 650 if (sc->dlci_state[idx] == DLCI_UP) 651 sc->dlci_state[idx] = DLCI_DOWN; 652 idx++; 653 } 654 sc->invalidx = idx; 655 /* we got and we wanted one. relax 656 * now.. but don't reset to 0 if it 657 * was unrequested. */ 658 if (sc->livs > sc->liv_per_full) 659 sc->livs = 0; 660 break; 661 } 662 } 663 break; 664 case 0x03: 665 case 0x53: 666 /* The remote tells us what it thinks the sequence 667 * numbers are. If it's not size 2, it must be a 668 * duplicate to have gotten this far, skip it. */ 669 if (segsize != 2) 670 goto nextIE; 671 sc->remote_seq = data[2]; 672 if (sc->local_seq == data[3]) { 673 sc->local_seq++; 674 sc->seq_retries = 0; 675 /* Note that all 3 Frame protocols seem to 676 * not like 0 as a sequence number. */ 677 if (sc->local_seq == 0) 678 sc->local_seq = 1; 679 } 680 break; 681 case 0x07: 682 case 0x57: 683 /* The remote tells us about a DLCI that it knows 684 * about. There may be many of these in a single 685 * status response */ 686 switch (segsize) { 687 case 6:/* only on 'group of 4' */ 688 dlci = ((u_short) data[2] & 0xff) << 8; 689 dlci |= (data[3] & 0xff); 690 if ((dlci < 1024) && (dlci > 0)) { 691 /* XXX */ 692 } 693 break; 694 case 3: 695 dlci = ((u_short) data[2] & 0x3f) << 4; 696 dlci |= ((data[3] & 0x78) >> 3); 697 if ((dlci < 1024) && (dlci > 0)) { 698 /* set up the bottom half of the 699 * support for that dlci if it's not 700 * already been done */ 701 /* store this information somewhere */ 702 } 703 break; 704 default: 705 goto nextIE; 706 } 707 if (sc->dlci_state[dlci] != DLCI_UP) { 708 /* bring new DLCI to life */ 709 /* may do more here some day */ 710 if (sc->dlci_state[dlci] != DLCI_DOWN) 711 log(LOG_INFO, 712 "nglmi: DLCI %d became active\n", 713 dlci); 714 sc->dlci_state[dlci] = DLCI_UP; 715 } 716 break; 717 } 718nextIE: 719 STEPBY(segsize + 2); 720 } 721 NG_FREE_M(m); 722 return (0); 723 724drop: 725 NG_FREE_M(m); 726 return (EINVAL); 727} 728 729/* 730 * Check that a packet is entirely kosha. 731 * return 1 of ok, and 0 if not. 732 * All data is discarded if a 0 is returned. 733 */ 734static int 735nglmi_checkdata(hook_p hook, struct mbuf *m) 736{ 737 sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 738 const u_char *data; 739 u_short packetlen; 740 unsigned short dlci; 741 u_char type; 742 u_char nextbyte; 743 int seq_seen = 0; 744 int resptype_seen = 0; /* 0 , 1 (partial) or 2 (full) */ 745 int highest_dlci = 0; 746 747 packetlen = m->m_len; 748 data = mtod(m, const u_char *); 749 if (*data != 0x03) { 750 log(LOG_WARNING, "nglmi: unexpected value in LMI(%d)\n", 1); 751 goto reject; 752 } 753 STEPBY(1); 754 755 /* look at the protocol ID */ 756 nextbyte = *data; 757 if (sc->flags & SCF_AUTO) { 758 SETLMITYPE(sc, SCF_NOLMI); /* start with a clean slate */ 759 switch (nextbyte) { 760 case 0x8: 761 sc->protoID = 8; 762 break; 763 case 0x9: 764 SETLMITYPE(sc, SCF_GROUP4); 765 sc->protoID = 9; 766 break; 767 default: 768 log(LOG_WARNING, "nglmi: bad Protocol ID(%d)\n", 769 (int) nextbyte); 770 goto reject; 771 } 772 } else { 773 if (nextbyte != sc->protoID) { 774 log(LOG_WARNING, "nglmi: unexpected Protocol ID(%d)\n", 775 (int) nextbyte); 776 goto reject; 777 } 778 } 779 STEPBY(1); 780 781 /* check call reference (always null in non ISDN frame relay) */ 782 if (*data != 0x00) { 783 log(LOG_WARNING, "nglmi: unexpected Call Reference (0x%x)\n", 784 data[-1]); 785 goto reject; 786 } 787 STEPBY(1); 788 789 /* check message type */ 790 switch ((type = *data)) { 791 case 0x75: /* Status enquiry */ 792 log(LOG_WARNING, "nglmi: unexpected message type(0x%x)\n", 793 data[-1]); 794 goto reject; 795 case 0x7D: /* Status message */ 796 break; 797 default: 798 log(LOG_WARNING, 799 "nglmi: unexpected msg type(0x%x) \n", (int) type); 800 goto reject; 801 } 802 STEPBY(1); 803 804 /* Now check if there is a 'locking shift'. This is only seen in 805 * Annex D frames. Don't increment immediately as it might not be 806 * there. */ 807 nextbyte = *data; 808 if (sc->flags & SCF_AUTO) { 809 if (!(GROUP4(sc))) { 810 if (nextbyte == 0x95) { 811 SETLMITYPE(sc, SCF_ANNEX_D); 812 STEPBY(1); 813 } else 814 SETLMITYPE(sc, SCF_ANNEX_A); 815 } else if (nextbyte == 0x95) { 816 log(LOG_WARNING, "nglmi: locking shift seen in G4\n"); 817 goto reject; 818 } 819 } else { 820 if (ANNEXD(sc)) { 821 if (*data == 0x95) 822 STEPBY(1); 823 else { 824 log(LOG_WARNING, 825 "nglmi: locking shift missing\n"); 826 goto reject; 827 } 828 } else if (*data == 0x95) { 829 log(LOG_WARNING, "nglmi: locking shift seen\n"); 830 goto reject; 831 } 832 } 833 834 /* While there is more data in the status packet, keep processing 835 * status items. First make sure there is enough data for the 836 * segment descriptor's length field. */ 837 while (packetlen >= 2) { 838 u_int segtype = data[0]; 839 u_int segsize = data[1]; 840 841 /* Now that we know how long it claims to be, make sure 842 * there is enough data for the next seg. */ 843 if (packetlen < (segsize + 2)) { 844 log(LOG_WARNING, "nglmi: IE longer than packet\n"); 845 break; 846 } 847 switch (segtype) { 848 case 0x01: 849 case 0x51: 850 /* According to MCI's HP analyser, we should just 851 * ignore if there is mor ethan one of these (?). */ 852 if (resptype_seen) { 853 log(LOG_WARNING, "nglmi: dup MSGTYPE\n"); 854 goto nextIE; 855 } 856 if (segsize != 1) { 857 log(LOG_WARNING, "nglmi: MSGTYPE wrong size\n"); 858 goto reject; 859 } 860 /* The remote end tells us what kind of response 861 * this is. Only expect a type 0 or 1. if it was a 862 * full (type 0) check we just asked for a type 863 * full. */ 864 switch (data[2]) { 865 case 1:/* partial */ 866 if (sc->livs > sc->liv_per_full) { 867 log(LOG_WARNING, 868 "nglmi: LIV when FULL expected\n"); 869 goto reject; /* need full */ 870 } 871 resptype_seen = 1; 872 break; 873 case 0:/* full */ 874 /* Full response is always acceptable */ 875 resptype_seen = 2; 876 break; 877 default: 878 log(LOG_WARNING, 879 "nglmi: Unknown report type %d\n", data[2]); 880 goto reject; 881 } 882 break; 883 case 0x03: 884 case 0x53: 885 /* The remote tells us what it thinks the sequence 886 * numbers are. I would have thought that there 887 * needs to be one and only one of these, but MCI 888 * want us to just ignore extras. (?) */ 889 if (resptype_seen == 0) { 890 log(LOG_WARNING, "nglmi: no TYPE before SEQ\n"); 891 goto reject; 892 } 893 if (seq_seen != 0) /* already seen seq numbers */ 894 goto nextIE; 895 if (segsize != 2) { 896 log(LOG_WARNING, "nglmi: bad SEQ sts size\n"); 897 goto reject; 898 } 899 if (sc->local_seq != data[3]) { 900 log(LOG_WARNING, "nglmi: unexpected SEQ\n"); 901 goto reject; 902 } 903 seq_seen = 1; 904 break; 905 case 0x07: 906 case 0x57: 907 /* The remote tells us about a DLCI that it knows 908 * about. There may be many of these in a single 909 * status response */ 910 if (seq_seen != 1) { /* already seen seq numbers? */ 911 log(LOG_WARNING, 912 "nglmi: No sequence before DLCI\n"); 913 goto reject; 914 } 915 if (resptype_seen != 2) { /* must be full */ 916 log(LOG_WARNING, 917 "nglmi: No resp type before DLCI\n"); 918 goto reject; 919 } 920 if (GROUP4(sc)) { 921 if (segsize != 6) { 922 log(LOG_WARNING, 923 "nglmi: wrong IE segsize\n"); 924 goto reject; 925 } 926 dlci = ((u_short) data[2] & 0xff) << 8; 927 dlci |= (data[3] & 0xff); 928 } else { 929 if (segsize != 3) { 930 log(LOG_WARNING, 931 "nglmi: DLCI headersize of %d" 932 " not supported\n", segsize - 1); 933 goto reject; 934 } 935 dlci = ((u_short) data[2] & 0x3f) << 4; 936 dlci |= ((data[3] & 0x78) >> 3); 937 } 938 /* async can only have one of these */ 939#if 0 /* async not yet accepted */ 940 if (async && highest_dlci) { 941 log(LOG_WARNING, 942 "nglmi: Async with > 1 DLCI\n"); 943 goto reject; 944 } 945#endif 946 /* Annex D says these will always be Ascending, but 947 * the HP test for G4 says we should accept 948 * duplicates, so for now allow that. ( <= vs. < ) */ 949#if 0 950 /* MCI tests want us to accept out of order for AnxD */ 951 if ((!GROUP4(sc)) && (dlci < highest_dlci)) { 952 /* duplicate or mis-ordered dlci */ 953 /* (spec says they will increase in number) */ 954 log(LOG_WARNING, "nglmi: DLCI out of order\n"); 955 goto reject; 956 } 957#endif 958 if (dlci > 1023) { 959 log(LOG_WARNING, "nglmi: DLCI out of range\n"); 960 goto reject; 961 } 962 highest_dlci = dlci; 963 break; 964 default: 965 log(LOG_WARNING, 966 "nglmi: unknown LMI segment type %d\n", segtype); 967 } 968nextIE: 969 STEPBY(segsize + 2); 970 } 971 if (packetlen != 0) { /* partial junk at end? */ 972 log(LOG_WARNING, 973 "nglmi: %d bytes extra at end of packet\n", packetlen); 974 goto print; 975 } 976 if (resptype_seen == 0) { 977 log(LOG_WARNING, "nglmi: No response type seen\n"); 978 goto reject; /* had no response type */ 979 } 980 if (seq_seen == 0) { 981 log(LOG_WARNING, "nglmi: No sequence numbers seen\n"); 982 goto reject; /* had no sequence numbers */ 983 } 984 return (1); 985 986print: 987 { 988 int i, j, k, pos; 989 char buf[100]; 990 int loc; 991 const u_char *bp = mtod(m, const u_char *); 992 993 k = i = 0; 994 loc = (m->m_len - packetlen); 995 log(LOG_WARNING, "nglmi: error at location %d\n", loc); 996 while (k < m->m_len) { 997 pos = 0; 998 j = 0; 999 while ((j++ < 16) && k < m->m_len) { 1000 pos += sprintf(buf + pos, "%c%02x", 1001 ((loc == k) ? '>' : ' '), 1002 bp[k]); 1003 k++; 1004 } 1005 if (i == 0) 1006 log(LOG_WARNING, "nglmi: packet data:%s\n", buf); 1007 else 1008 log(LOG_WARNING, "%04d :%s\n", k, buf); 1009 i++; 1010 } 1011 } 1012 return (1); 1013reject: 1014 { 1015 int i, j, k, pos; 1016 char buf[100]; 1017 int loc; 1018 const u_char *bp = mtod(m, const u_char *); 1019 1020 k = i = 0; 1021 loc = (m->m_len - packetlen); 1022 log(LOG_WARNING, "nglmi: error at location %d\n", loc); 1023 while (k < m->m_len) { 1024 pos = 0; 1025 j = 0; 1026 while ((j++ < 16) && k < m->m_len) { 1027 pos += sprintf(buf + pos, "%c%02x", 1028 ((loc == k) ? '>' : ' '), 1029 bp[k]); 1030 k++; 1031 } 1032 if (i == 0) 1033 log(LOG_WARNING, "nglmi: packet data:%s\n", buf); 1034 else 1035 log(LOG_WARNING, "%04d :%s\n", k, buf); 1036 i++; 1037 } 1038 } 1039 NG_FREE_M(m); 1040 return (0); 1041} 1042 1043/* 1044 * Do local shutdown processing.. 1045 * Cut any remaining links and free our local resources. 1046 */ 1047static int 1048nglmi_shutdown(node_p node) 1049{ 1050 const sc_p sc = NG_NODE_PRIVATE(node); 1051 1052 NG_NODE_SET_PRIVATE(node, NULL); 1053 NG_NODE_UNREF(sc->node); 1054 free(sc, M_NETGRAPH); 1055 return (0); 1056} 1057 1058/* 1059 * Hook disconnection 1060 * For this type, removal of any link except "debug" destroys the node. 1061 */ 1062static int 1063nglmi_disconnect(hook_p hook) 1064{ 1065 const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1066 1067 /* OK to remove debug hook(s) */ 1068 if (NG_HOOK_PRIVATE(hook) == NULL) 1069 return (0); 1070 1071 /* Stop timer if it's currently active */ 1072 if (sc->flags & SCF_CONNECTED) 1073 ng_uncallout(&sc->handle, sc->node); 1074 1075 /* Self-destruct */ 1076 if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))) 1077 ng_rmnode_self(NG_HOOK_NODE(hook)); 1078 return (0); 1079} 1080 1081