Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_lmi.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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: releng/5.3/sys/netgraph/ng_lmi.c 136588 2004-10-16 08:43:07Z cvs2svn $ 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_shutdown; 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); 99 100 static struct ng_type typestruct = { 101 .version = NG_ABI_VERSION, 102 .name = NG_LMI_NODE_TYPE, 103 .constructor = nglmi_constructor, 104 .rcvmsg = nglmi_rcvmsg, 105 .shutdown = nglmi_shutdown, 106 .newhook = nglmi_newhook, 107 .rcvdata = nglmi_rcvdata, 108 .disconnect = nglmi_disconnect, 109 }; 110 NETGRAPH_INIT(lmi, &typestruct); 111 112 /* 113 * Info and status per node 114 */ 115 struct nglmi_softc { 116 node_p node; /* netgraph node */ 117 int flags; /* state */ 118 int poll_count; /* the count of times for autolmi */ 119 int poll_state; /* state of auto detect machine */ 120 u_char remote_seq; /* sequence number the remote sent */ 121 u_char local_seq; /* last sequence number we sent */ 122 u_char protoID; /* 9 for group of 4, 8 otherwise */ 123 u_long seq_retries; /* sent this how many time so far */ 124 struct callout_handle handle; /* see timeout(9) */ 125 int liv_per_full; 126 int liv_rate; 127 int livs; 128 int need_full; 129 hook_p lmi_channel; /* whatever we ended up using */ 130 hook_p lmi_annexA; 131 hook_p lmi_annexD; 132 hook_p lmi_group4; 133 hook_p lmi_channel0; /* auto-detect on DLCI 0 */ 134 hook_p lmi_channel1023;/* auto-detect on DLCI 1023 */ 135 char *protoname; /* cache protocol name */ 136 u_char dlci_state[MAXDLCI + 1]; 137 int invalidx; /* next dlci's to invalidate */ 138 }; 139 typedef struct nglmi_softc *sc_p; 140 141 /* 142 * Other internal functions 143 */ 144 static void LMI_ticker(void *arg); 145 static void nglmi_startup_fixed(sc_p sc, hook_p hook); 146 static void nglmi_startup_auto(sc_p sc); 147 static void nglmi_startup(sc_p sc); 148 static void nglmi_inquire(sc_p sc, int full); 149 static void ngauto_state_machine(sc_p sc); 150 151 /* 152 * Values for 'flags' field 153 * NB: the SCF_CONNECTED flag is set if and only if the timer is running. 154 */ 155 #define SCF_CONNECTED 0x01 /* connected to something */ 156 #define SCF_AUTO 0x02 /* we are auto-detecting */ 157 #define SCF_FIXED 0x04 /* we are fixed from the start */ 158 159 #define SCF_LMITYPE 0x18 /* mask for determining Annex mode */ 160 #define SCF_NOLMI 0x00 /* no LMI type selected yet */ 161 #define SCF_ANNEX_A 0x08 /* running annex A mode */ 162 #define SCF_ANNEX_D 0x10 /* running annex D mode */ 163 #define SCF_GROUP4 0x18 /* running group of 4 */ 164 165 #define SETLMITYPE(sc, annex) \ 166 do { \ 167 (sc)->flags &= ~SCF_LMITYPE; \ 168 (sc)->flags |= (annex); \ 169 } while (0) 170 171 #define NOPROTO(sc) (((sc)->flags & SCF_LMITYPE) == SCF_NOLMI) 172 #define ANNEXA(sc) (((sc)->flags & SCF_LMITYPE) == SCF_ANNEX_A) 173 #define ANNEXD(sc) (((sc)->flags & SCF_LMITYPE) == SCF_ANNEX_D) 174 #define GROUP4(sc) (((sc)->flags & SCF_LMITYPE) == SCF_GROUP4) 175 176 #define LMIPOLLSIZE 3 177 #define LMI_PATIENCE 8 /* declare all DLCI DOWN after N LMI failures */ 178 179 /* 180 * Node constructor 181 */ 182 static int 183 nglmi_constructor(node_p node) 184 { 185 sc_p sc; 186 187 MALLOC(sc, sc_p, sizeof(*sc), M_NETGRAPH, M_NOWAIT | M_ZERO); 188 if (sc == NULL) 189 return (ENOMEM); 190 callout_handle_init(&sc->handle); 191 NG_NODE_SET_PRIVATE(node, sc); 192 sc->protoname = NAME_NONE; 193 sc->node = node; 194 sc->liv_per_full = NG_LMI_SEQ_PER_FULL; /* make this dynamic */ 195 sc->liv_rate = NG_LMI_KEEPALIVE_RATE; 196 return (0); 197 } 198 199 /* 200 * The LMI channel has a private pointer which is the same as the 201 * node private pointer. The debug channel has a NULL private pointer. 202 */ 203 static int 204 nglmi_newhook(node_p node, hook_p hook, const char *name) 205 { 206 sc_p sc = NG_NODE_PRIVATE(node); 207 208 if (strcmp(name, NG_LMI_HOOK_DEBUG) == 0) { 209 NG_HOOK_SET_PRIVATE(hook, NULL); 210 return (0); 211 } 212 if (sc->flags & SCF_CONNECTED) { 213 /* already connected, return an error */ 214 return (EINVAL); 215 } 216 if (strcmp(name, NG_LMI_HOOK_ANNEXA) == 0) { 217 sc->lmi_annexA = hook; 218 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 219 sc->protoID = 8; 220 SETLMITYPE(sc, SCF_ANNEX_A); 221 sc->protoname = NAME_ANNEXA; 222 nglmi_startup_fixed(sc, hook); 223 } else if (strcmp(name, NG_LMI_HOOK_ANNEXD) == 0) { 224 sc->lmi_annexD = hook; 225 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 226 sc->protoID = 8; 227 SETLMITYPE(sc, SCF_ANNEX_D); 228 sc->protoname = NAME_ANNEXD; 229 nglmi_startup_fixed(sc, hook); 230 } else if (strcmp(name, NG_LMI_HOOK_GROUPOF4) == 0) { 231 sc->lmi_group4 = hook; 232 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 233 sc->protoID = 9; 234 SETLMITYPE(sc, SCF_GROUP4); 235 sc->protoname = NAME_GROUP4; 236 nglmi_startup_fixed(sc, hook); 237 } else if (strcmp(name, NG_LMI_HOOK_AUTO0) == 0) { 238 /* Note this, and if B is already installed, we're complete */ 239 sc->lmi_channel0 = hook; 240 sc->protoname = NAME_NONE; 241 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 242 if (sc->lmi_channel1023) 243 nglmi_startup_auto(sc); 244 } else if (strcmp(name, NG_LMI_HOOK_AUTO1023) == 0) { 245 /* Note this, and if A is already installed, we're complete */ 246 sc->lmi_channel1023 = hook; 247 sc->protoname = NAME_NONE; 248 NG_HOOK_SET_PRIVATE(hook, NG_NODE_PRIVATE(node)); 249 if (sc->lmi_channel0) 250 nglmi_startup_auto(sc); 251 } else 252 return (EINVAL); /* unknown hook */ 253 return (0); 254 } 255 256 /* 257 * We have just attached to a live (we hope) node. 258 * Fire out a LMI inquiry, and then start up the timers. 259 */ 260 static void 261 LMI_ticker(void *arg) 262 { 263 sc_p sc = arg; 264 int s = splnet(); 265 266 if (sc->flags & SCF_AUTO) { 267 ngauto_state_machine(sc); 268 sc->handle = timeout(LMI_ticker, sc, NG_LMI_POLL_RATE * hz); 269 } else { 270 if (sc->livs++ >= sc->liv_per_full) { 271 nglmi_inquire(sc, 1); 272 /* sc->livs = 0; *//* do this when we get the answer! */ 273 } else { 274 nglmi_inquire(sc, 0); 275 } 276 sc->handle = timeout(LMI_ticker, sc, sc->liv_rate * hz); 277 } 278 splx(s); 279 } 280 281 static void 282 nglmi_startup_fixed(sc_p sc, hook_p hook) 283 { 284 sc->flags |= (SCF_FIXED | SCF_CONNECTED); 285 sc->lmi_channel = hook; 286 nglmi_startup(sc); 287 } 288 289 static void 290 nglmi_startup_auto(sc_p sc) 291 { 292 sc->flags |= (SCF_AUTO | SCF_CONNECTED); 293 sc->poll_state = 0; /* reset state machine */ 294 sc->poll_count = 0; 295 nglmi_startup(sc); 296 } 297 298 static void 299 nglmi_startup(sc_p sc) 300 { 301 sc->remote_seq = 0; 302 sc->local_seq = 1; 303 sc->seq_retries = 0; 304 sc->livs = sc->liv_per_full - 1; 305 /* start off the ticker in 1 sec */ 306 sc->handle = timeout(LMI_ticker, sc, hz); 307 } 308 309 static void 310 nglmi_inquire(sc_p sc, int full) 311 { 312 struct mbuf *m; 313 struct ng_tag_prio *ptag; 314 char *cptr, *start; 315 int error; 316 317 if (sc->lmi_channel == NULL) 318 return; 319 MGETHDR(m, M_DONTWAIT, MT_DATA); 320 if (m == NULL) { 321 log(LOG_ERR, "nglmi: unable to start up LMI processing\n"); 322 return; 323 } 324 m->m_pkthdr.rcvif = NULL; 325 326 /* Attach a tag to packet, marking it of link level state priority, so 327 * that device driver would put it in the beginning of queue */ 328 329 ptag = (struct ng_tag_prio *)m_tag_alloc(NGM_GENERIC_COOKIE, NG_TAG_PRIO, 330 (sizeof(struct ng_tag_prio) - sizeof(struct m_tag)), M_NOWAIT); 331 if (ptag != NULL) { /* if it failed, well, it was optional anyhow */ 332 ptag->priority = NG_PRIO_LINKSTATE; 333 ptag->discardability = -1; 334 m_tag_prepend(m, &ptag->tag); 335 } 336 337 m->m_data += 4; /* leave some room for a header */ 338 cptr = start = mtod(m, char *); 339 /* add in the header for an LMI inquiry. */ 340 *cptr++ = 0x03; /* UI frame */ 341 if (GROUP4(sc)) 342 *cptr++ = 0x09; /* proto discriminator */ 343 else 344 *cptr++ = 0x08; /* proto discriminator */ 345 *cptr++ = 0x00; /* call reference */ 346 *cptr++ = 0x75; /* inquiry */ 347 348 /* If we are Annex-D, there is this extra thing.. */ 349 if (ANNEXD(sc)) 350 *cptr++ = 0x95; /* ??? */ 351 /* Add a request type */ 352 if (ANNEXA(sc)) 353 *cptr++ = 0x51; /* report type */ 354 else 355 *cptr++ = 0x01; /* report type */ 356 *cptr++ = 0x01; /* size = 1 */ 357 if (full) 358 *cptr++ = 0x00; /* full */ 359 else 360 *cptr++ = 0x01; /* partial */ 361 362 /* Add a link verification IE */ 363 if (ANNEXA(sc)) 364 *cptr++ = 0x53; /* verification IE */ 365 else 366 *cptr++ = 0x03; /* verification IE */ 367 *cptr++ = 0x02; /* 2 extra bytes */ 368 *cptr++ = sc->local_seq; 369 *cptr++ = sc->remote_seq; 370 sc->seq_retries++; 371 372 /* Send it */ 373 m->m_len = m->m_pkthdr.len = cptr - start; 374 NG_SEND_DATA_ONLY(error, sc->lmi_channel, m); 375 376 /* If we've been sending requests for long enough, and there has 377 * been no response, then mark as DOWN, any DLCIs that are UP. */ 378 if (sc->seq_retries == LMI_PATIENCE) { 379 int count; 380 381 for (count = 0; count < MAXDLCI; count++) 382 if (sc->dlci_state[count] == DLCI_UP) 383 sc->dlci_state[count] = DLCI_DOWN; 384 } 385 } 386 387 /* 388 * State machine for LMI auto-detect. The transitions are ordered 389 * to try the more likely possibilities first. 390 */ 391 static void 392 ngauto_state_machine(sc_p sc) 393 { 394 if ((sc->poll_count <= 0) || (sc->poll_count > LMIPOLLSIZE)) { 395 /* time to change states in the auto probe machine */ 396 /* capture wild values of poll_count while we are at it */ 397 sc->poll_count = LMIPOLLSIZE; 398 sc->poll_state++; 399 } 400 switch (sc->poll_state) { 401 case 7: 402 log(LOG_WARNING, "nglmi: no response from exchange\n"); 403 default: /* capture bad states */ 404 sc->poll_state = 1; 405 case 1: 406 sc->lmi_channel = sc->lmi_channel0; 407 SETLMITYPE(sc, SCF_ANNEX_D); 408 break; 409 case 2: 410 sc->lmi_channel = sc->lmi_channel1023; 411 SETLMITYPE(sc, SCF_ANNEX_D); 412 break; 413 case 3: 414 sc->lmi_channel = sc->lmi_channel0; 415 SETLMITYPE(sc, SCF_ANNEX_A); 416 break; 417 case 4: 418 sc->lmi_channel = sc->lmi_channel1023; 419 SETLMITYPE(sc, SCF_GROUP4); 420 break; 421 case 5: 422 sc->lmi_channel = sc->lmi_channel1023; 423 SETLMITYPE(sc, SCF_ANNEX_A); 424 break; 425 case 6: 426 sc->lmi_channel = sc->lmi_channel0; 427 SETLMITYPE(sc, SCF_GROUP4); 428 break; 429 } 430 431 /* send an inquirey encoded appropriatly */ 432 nglmi_inquire(sc, 0); 433 sc->poll_count--; 434 } 435 436 /* 437 * Receive a netgraph control message. 438 */ 439 static int 440 nglmi_rcvmsg(node_p node, item_p item, hook_p lasthook) 441 { 442 sc_p sc = NG_NODE_PRIVATE(node); 443 struct ng_mesg *resp = NULL; 444 int error = 0; 445 struct ng_mesg *msg; 446 447 NGI_GET_MSG(item, msg); 448 switch (msg->header.typecookie) { 449 case NGM_GENERIC_COOKIE: 450 switch (msg->header.cmd) { 451 case NGM_TEXT_STATUS: 452 { 453 char *arg; 454 int pos, count; 455 456 NG_MKRESPONSE(resp, msg, NG_TEXTRESPONSE, M_NOWAIT); 457 if (resp == NULL) { 458 error = ENOMEM; 459 break; 460 } 461 arg = resp->data; 462 pos = sprintf(arg, "protocol %s ", sc->protoname); 463 if (sc->flags & SCF_FIXED) 464 pos += sprintf(arg + pos, "fixed\n"); 465 else if (sc->flags & SCF_AUTO) 466 pos += sprintf(arg + pos, "auto-detecting\n"); 467 else 468 pos += sprintf(arg + pos, "auto on dlci %d\n", 469 (sc->lmi_channel == sc->lmi_channel0) ? 470 0 : 1023); 471 pos += sprintf(arg + pos, 472 "keepalive period: %d seconds\n", sc->liv_rate); 473 pos += sprintf(arg + pos, 474 "unacknowledged keepalives: %ld\n", 475 sc->seq_retries); 476 for (count = 0; 477 ((count <= MAXDLCI) 478 && (pos < (NG_TEXTRESPONSE - 20))); 479 count++) { 480 if (sc->dlci_state[count]) { 481 pos += sprintf(arg + pos, 482 "dlci %d %s\n", count, 483 (sc->dlci_state[count] 484 == DLCI_UP) ? "up" : "down"); 485 } 486 } 487 resp->header.arglen = pos + 1; 488 break; 489 } 490 default: 491 error = EINVAL; 492 break; 493 } 494 break; 495 case NGM_LMI_COOKIE: 496 switch (msg->header.cmd) { 497 case NGM_LMI_GET_STATUS: 498 { 499 struct nglmistat *stat; 500 int k; 501 502 NG_MKRESPONSE(resp, msg, sizeof(*stat), M_NOWAIT); 503 if (!resp) { 504 error = ENOMEM; 505 break; 506 } 507 stat = (struct nglmistat *) resp->data; 508 strncpy(stat->proto, 509 sc->protoname, sizeof(stat->proto) - 1); 510 strncpy(stat->hook, 511 sc->protoname, sizeof(stat->hook) - 1); 512 stat->autod = !!(sc->flags & SCF_AUTO); 513 stat->fixed = !!(sc->flags & SCF_FIXED); 514 for (k = 0; k <= MAXDLCI; k++) { 515 switch (sc->dlci_state[k]) { 516 case DLCI_UP: 517 stat->up[k / 8] |= (1 << (k % 8)); 518 /* fall through */ 519 case DLCI_DOWN: 520 stat->seen[k / 8] |= (1 << (k % 8)); 521 break; 522 } 523 } 524 break; 525 } 526 default: 527 error = EINVAL; 528 break; 529 } 530 break; 531 default: 532 error = EINVAL; 533 break; 534 } 535 536 NG_RESPOND_MSG(error, node, item, resp); 537 NG_FREE_MSG(msg); 538 return (error); 539 } 540 541 #define STEPBY(stepsize) \ 542 do { \ 543 packetlen -= (stepsize); \ 544 data += (stepsize); \ 545 } while (0) 546 547 /* 548 * receive data, and use it to update our status. 549 * Anything coming in on the debug port is discarded. 550 */ 551 static int 552 nglmi_rcvdata(hook_p hook, item_p item) 553 { 554 sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 555 const u_char *data; 556 unsigned short dlci; 557 u_short packetlen; 558 int resptype_seen = 0; 559 int seq_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_hdr.mh_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 (seq_seen != 0) /* already seen seq numbers */ 670 goto nextIE; 671 if (segsize != 2) 672 goto nextIE; 673 sc->remote_seq = data[2]; 674 if (sc->local_seq == data[3]) { 675 sc->local_seq++; 676 sc->seq_retries = 0; 677 /* Note that all 3 Frame protocols seem to 678 * not like 0 as a sequence number. */ 679 if (sc->local_seq == 0) 680 sc->local_seq = 1; 681 } 682 break; 683 case 0x07: 684 case 0x57: 685 /* The remote tells us about a DLCI that it knows 686 * about. There may be many of these in a single 687 * status response */ 688 switch (segsize) { 689 case 6:/* only on 'group of 4' */ 690 dlci = ((u_short) data[2] & 0xff) << 8; 691 dlci |= (data[3] & 0xff); 692 if ((dlci < 1024) && (dlci > 0)) { 693 /* XXX */ 694 } 695 break; 696 case 3: 697 dlci = ((u_short) data[2] & 0x3f) << 4; 698 dlci |= ((data[3] & 0x78) >> 3); 699 if ((dlci < 1024) && (dlci > 0)) { 700 /* set up the bottom half of the 701 * support for that dlci if it's not 702 * already been done */ 703 /* store this information somewhere */ 704 } 705 break; 706 default: 707 goto nextIE; 708 } 709 if (sc->dlci_state[dlci] != DLCI_UP) { 710 /* bring new DLCI to life */ 711 /* may do more here some day */ 712 if (sc->dlci_state[dlci] != DLCI_DOWN) 713 log(LOG_INFO, 714 "nglmi: DLCI %d became active\n", 715 dlci); 716 sc->dlci_state[dlci] = DLCI_UP; 717 } 718 break; 719 } 720 nextIE: 721 STEPBY(segsize + 2); 722 } 723 NG_FREE_M(m); 724 return (0); 725 726 drop: 727 NG_FREE_M(m); 728 return (EINVAL); 729 } 730 731 /* 732 * Check that a packet is entirely kosha. 733 * return 1 of ok, and 0 if not. 734 * All data is discarded if a 0 is returned. 735 */ 736 static int 737 nglmi_checkdata(hook_p hook, struct mbuf *m) 738 { 739 sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 740 const u_char *data; 741 u_short packetlen; 742 unsigned short dlci; 743 u_char type; 744 u_char nextbyte; 745 int seq_seen = 0; 746 int resptype_seen = 0; /* 0 , 1 (partial) or 2 (full) */ 747 int highest_dlci = 0; 748 749 packetlen = m->m_hdr.mh_len; 750 data = mtod(m, const u_char *); 751 if (*data != 0x03) { 752 log(LOG_WARNING, "nglmi: unexpected value in LMI(%d)\n", 1); 753 goto reject; 754 } 755 STEPBY(1); 756 757 /* look at the protocol ID */ 758 nextbyte = *data; 759 if (sc->flags & SCF_AUTO) { 760 SETLMITYPE(sc, SCF_NOLMI); /* start with a clean slate */ 761 switch (nextbyte) { 762 case 0x8: 763 sc->protoID = 8; 764 break; 765 case 0x9: 766 SETLMITYPE(sc, SCF_GROUP4); 767 sc->protoID = 9; 768 break; 769 default: 770 log(LOG_WARNING, "nglmi: bad Protocol ID(%d)\n", 771 (int) nextbyte); 772 goto reject; 773 } 774 } else { 775 if (nextbyte != sc->protoID) { 776 log(LOG_WARNING, "nglmi: unexpected Protocol ID(%d)\n", 777 (int) nextbyte); 778 goto reject; 779 } 780 } 781 STEPBY(1); 782 783 /* check call reference (always null in non ISDN frame relay) */ 784 if (*data != 0x00) { 785 log(LOG_WARNING, "nglmi: unexpected Call Reference (0x%x)\n", 786 data[-1]); 787 goto reject; 788 } 789 STEPBY(1); 790 791 /* check message type */ 792 switch ((type = *data)) { 793 case 0x75: /* Status enquiry */ 794 log(LOG_WARNING, "nglmi: unexpected message type(0x%x)\n", 795 data[-1]); 796 goto reject; 797 case 0x7D: /* Status message */ 798 break; 799 default: 800 log(LOG_WARNING, 801 "nglmi: unexpected msg type(0x%x) \n", (int) type); 802 goto reject; 803 } 804 STEPBY(1); 805 806 /* Now check if there is a 'locking shift'. This is only seen in 807 * Annex D frames. Don't increment immediately as it might not be 808 * there. */ 809 nextbyte = *data; 810 if (sc->flags & SCF_AUTO) { 811 if (!(GROUP4(sc))) { 812 if (nextbyte == 0x95) { 813 SETLMITYPE(sc, SCF_ANNEX_D); 814 STEPBY(1); 815 } else 816 SETLMITYPE(sc, SCF_ANNEX_A); 817 } else if (nextbyte == 0x95) { 818 log(LOG_WARNING, "nglmi: locking shift seen in G4\n"); 819 goto reject; 820 } 821 } else { 822 if (ANNEXD(sc)) { 823 if (*data == 0x95) 824 STEPBY(1); 825 else { 826 log(LOG_WARNING, 827 "nglmi: locking shift missing\n"); 828 goto reject; 829 } 830 } else if (*data == 0x95) { 831 log(LOG_WARNING, "nglmi: locking shift seen\n"); 832 goto reject; 833 } 834 } 835 836 /* While there is more data in the status packet, keep processing 837 * status items. First make sure there is enough data for the 838 * segment descriptor's length field. */ 839 while (packetlen >= 2) { 840 u_int segtype = data[0]; 841 u_int segsize = data[1]; 842 843 /* Now that we know how long it claims to be, make sure 844 * there is enough data for the next seg. */ 845 if (packetlen < (segsize + 2)) { 846 log(LOG_WARNING, "nglmi: IE longer than packet\n"); 847 break; 848 } 849 switch (segtype) { 850 case 0x01: 851 case 0x51: 852 /* According to MCI's HP analyser, we should just 853 * ignore if there is mor ethan one of these (?). */ 854 if (resptype_seen) { 855 log(LOG_WARNING, "nglmi: dup MSGTYPE\n"); 856 goto nextIE; 857 } 858 if (segsize != 1) { 859 log(LOG_WARNING, "nglmi: MSGTYPE wrong size\n"); 860 goto reject; 861 } 862 /* The remote end tells us what kind of response 863 * this is. Only expect a type 0 or 1. if it was a 864 * full (type 0) check we just asked for a type 865 * full. */ 866 switch (data[2]) { 867 case 1:/* partial */ 868 if (sc->livs > sc->liv_per_full) { 869 log(LOG_WARNING, 870 "nglmi: LIV when FULL expected\n"); 871 goto reject; /* need full */ 872 } 873 resptype_seen = 1; 874 break; 875 case 0:/* full */ 876 /* Full response is always acceptable */ 877 resptype_seen = 2; 878 break; 879 default: 880 log(LOG_WARNING, 881 "nglmi: Unknown report type %d\n", data[2]); 882 goto reject; 883 } 884 break; 885 case 0x03: 886 case 0x53: 887 /* The remote tells us what it thinks the sequence 888 * numbers are. I would have thought that there 889 * needs to be one and only one of these, but MCI 890 * want us to just ignore extras. (?) */ 891 if (resptype_seen == 0) { 892 log(LOG_WARNING, "nglmi: no TYPE before SEQ\n"); 893 goto reject; 894 } 895 if (seq_seen != 0) /* already seen seq numbers */ 896 goto nextIE; 897 if (segsize != 2) { 898 log(LOG_WARNING, "nglmi: bad SEQ sts size\n"); 899 goto reject; 900 } 901 if (sc->local_seq != data[3]) { 902 log(LOG_WARNING, "nglmi: unexpected SEQ\n"); 903 goto reject; 904 } 905 seq_seen = 1; 906 break; 907 case 0x07: 908 case 0x57: 909 /* The remote tells us about a DLCI that it knows 910 * about. There may be many of these in a single 911 * status response */ 912 if (seq_seen != 1) { /* already seen seq numbers? */ 913 log(LOG_WARNING, 914 "nglmi: No sequence before DLCI\n"); 915 goto reject; 916 } 917 if (resptype_seen != 2) { /* must be full */ 918 log(LOG_WARNING, 919 "nglmi: No resp type before DLCI\n"); 920 goto reject; 921 } 922 if (GROUP4(sc)) { 923 if (segsize != 6) { 924 log(LOG_WARNING, 925 "nglmi: wrong IE segsize\n"); 926 goto reject; 927 } 928 dlci = ((u_short) data[2] & 0xff) << 8; 929 dlci |= (data[3] & 0xff); 930 } else { 931 if (segsize != 3) { 932 log(LOG_WARNING, 933 "nglmi: DLCI headersize of %d" 934 " not supported\n", segsize - 1); 935 goto reject; 936 } 937 dlci = ((u_short) data[2] & 0x3f) << 4; 938 dlci |= ((data[3] & 0x78) >> 3); 939 } 940 /* async can only have one of these */ 941 #if 0 /* async not yet accepted */ 942 if (async && highest_dlci) { 943 log(LOG_WARNING, 944 "nglmi: Async with > 1 DLCI\n"); 945 goto reject; 946 } 947 #endif 948 /* Annex D says these will always be Ascending, but 949 * the HP test for G4 says we should accept 950 * duplicates, so for now allow that. ( <= vs. < ) */ 951 #if 0 952 /* MCI tests want us to accept out of order for AnxD */ 953 if ((!GROUP4(sc)) && (dlci < highest_dlci)) { 954 /* duplicate or mis-ordered dlci */ 955 /* (spec says they will increase in number) */ 956 log(LOG_WARNING, "nglmi: DLCI out of order\n"); 957 goto reject; 958 } 959 #endif 960 if (dlci > 1023) { 961 log(LOG_WARNING, "nglmi: DLCI out of range\n"); 962 goto reject; 963 } 964 highest_dlci = dlci; 965 break; 966 default: 967 log(LOG_WARNING, 968 "nglmi: unknown LMI segment type %d\n", segtype); 969 } 970 nextIE: 971 STEPBY(segsize + 2); 972 } 973 if (packetlen != 0) { /* partial junk at end? */ 974 log(LOG_WARNING, 975 "nglmi: %d bytes extra at end of packet\n", packetlen); 976 goto print; 977 } 978 if (resptype_seen == 0) { 979 log(LOG_WARNING, "nglmi: No response type seen\n"); 980 goto reject; /* had no response type */ 981 } 982 if (seq_seen == 0) { 983 log(LOG_WARNING, "nglmi: No sequence numbers seen\n"); 984 goto reject; /* had no sequence numbers */ 985 } 986 return (1); 987 988 print: 989 { 990 int i, j, k, pos; 991 char buf[100]; 992 int loc; 993 const u_char *bp = mtod(m, const u_char *); 994 995 k = i = 0; 996 loc = (m->m_hdr.mh_len - packetlen); 997 log(LOG_WARNING, "nglmi: error at location %d\n", loc); 998 while (k < m->m_hdr.mh_len) { 999 pos = 0; 1000 j = 0; 1001 while ((j++ < 16) && k < m->m_hdr.mh_len) { 1002 pos += sprintf(buf + pos, "%c%02x", 1003 ((loc == k) ? '>' : ' '), 1004 bp[k]); 1005 k++; 1006 } 1007 if (i == 0) 1008 log(LOG_WARNING, "nglmi: packet data:%s\n", buf); 1009 else 1010 log(LOG_WARNING, "%04d :%s\n", k, buf); 1011 i++; 1012 } 1013 } 1014 return (1); 1015 reject: 1016 { 1017 int i, j, k, pos; 1018 char buf[100]; 1019 int loc; 1020 const u_char *bp = mtod(m, const u_char *); 1021 1022 k = i = 0; 1023 loc = (m->m_hdr.mh_len - packetlen); 1024 log(LOG_WARNING, "nglmi: error at location %d\n", loc); 1025 while (k < m->m_hdr.mh_len) { 1026 pos = 0; 1027 j = 0; 1028 while ((j++ < 16) && k < m->m_hdr.mh_len) { 1029 pos += sprintf(buf + pos, "%c%02x", 1030 ((loc == k) ? '>' : ' '), 1031 bp[k]); 1032 k++; 1033 } 1034 if (i == 0) 1035 log(LOG_WARNING, "nglmi: packet data:%s\n", buf); 1036 else 1037 log(LOG_WARNING, "%04d :%s\n", k, buf); 1038 i++; 1039 } 1040 } 1041 NG_FREE_M(m); 1042 return (0); 1043 } 1044 1045 /* 1046 * Do local shutdown processing.. 1047 * Cut any remaining links and free our local resources. 1048 */ 1049 static int 1050 nglmi_shutdown(node_p node) 1051 { 1052 const sc_p sc = NG_NODE_PRIVATE(node); 1053 1054 NG_NODE_SET_PRIVATE(node, NULL); 1055 NG_NODE_UNREF(sc->node); 1056 FREE(sc, M_NETGRAPH); 1057 return (0); 1058 } 1059 1060 /* 1061 * Hook disconnection 1062 * For this type, removal of any link except "debug" destroys the node. 1063 */ 1064 static int 1065 nglmi_disconnect(hook_p hook) 1066 { 1067 const sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 1068 1069 /* OK to remove debug hook(s) */ 1070 if (NG_HOOK_PRIVATE(hook) == NULL) 1071 return (0); 1072 1073 /* Stop timer if it's currently active */ 1074 if (sc->flags & SCF_CONNECTED) 1075 untimeout(LMI_ticker, sc, sc->handle); 1076 1077 /* Self-destruct */ 1078 if (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))) 1079 ng_rmnode_self(NG_HOOK_NODE(hook)); 1080 return (0); 1081 } 1082
Cache object: c084cf5308a4a787634fc5b9c6563f0e
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]