ether.c revision 66898
1/*- 2 * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: head/usr.sbin/ppp/ether.c 66898 2000-10-09 21:18:23Z brian $ 27 */ 28 29#include <sys/param.h> 30#include <sys/socket.h> 31#include <sys/un.h> 32#include <netinet/in.h> 33#include <arpa/inet.h> 34#include <netdb.h> 35#include <netgraph.h> 36#include <net/ethernet.h> 37#include <netinet/in_systm.h> 38#include <netinet/ip.h> 39#include <netgraph/ng_ether.h> 40#include <netgraph/ng_message.h> 41#include <netgraph/ng_pppoe.h> 42#include <netgraph/ng_socket.h> 43 44#include <errno.h> 45#include <stdio.h> 46#include <stdlib.h> 47#include <string.h> 48#include <sysexits.h> 49#include <sys/fcntl.h> 50#if defined(__FreeBSD__) && !defined(NOKLDLOAD) 51#include <sys/linker.h> 52#include <sys/module.h> 53#endif 54#include <sys/uio.h> 55#include <termios.h> 56#include <sys/time.h> 57#include <unistd.h> 58 59#include "layer.h" 60#include "defs.h" 61#include "mbuf.h" 62#include "log.h" 63#include "timer.h" 64#include "lqr.h" 65#include "hdlc.h" 66#include "throughput.h" 67#include "fsm.h" 68#include "lcp.h" 69#include "ccp.h" 70#include "link.h" 71#include "async.h" 72#include "descriptor.h" 73#include "physical.h" 74#include "main.h" 75#include "mp.h" 76#include "chat.h" 77#include "auth.h" 78#include "chap.h" 79#include "cbcp.h" 80#include "datalink.h" 81#include "slcompress.h" 82#include "iplist.h" 83#include "ipcp.h" 84#include "filter.h" 85#ifndef NORADIUS 86#include "radius.h" 87#endif 88#include "bundle.h" 89#include "id.h" 90#include "ether.h" 91 92 93#define PPPOE_NODE_TYPE_LEN (sizeof NG_PPPOE_NODE_TYPE - 1) /* "PPPoE" */ 94 95struct etherdevice { 96 struct device dev; /* What struct physical knows about */ 97 int cs; /* Control socket */ 98 int connected; /* Are we connected yet ? */ 99 int timeout; /* Seconds attempting to connect */ 100 char hook[sizeof TUN_NAME + 11]; /* Our socket node hook */ 101}; 102 103#define device2ether(d) \ 104 ((d)->type == ETHER_DEVICE ? (struct etherdevice *)d : NULL) 105 106int 107ether_DeviceSize(void) 108{ 109 return sizeof(struct etherdevice); 110} 111 112static ssize_t 113ether_Write(struct physical *p, const void *v, size_t n) 114{ 115 struct etherdevice *dev = device2ether(p->handler); 116 117 return NgSendData(p->fd, dev->hook, v, n) == -1 ? -1 : n; 118} 119 120static ssize_t 121ether_Read(struct physical *p, void *v, size_t n) 122{ 123 char hook[sizeof TUN_NAME + 11]; 124 125 return NgRecvData(p->fd, v, n, hook); 126} 127 128static int 129ether_RemoveFromSet(struct physical *p, fd_set *r, fd_set *w, fd_set *e) 130{ 131 struct etherdevice *dev = device2ether(p->handler); 132 int result; 133 134 if (r && dev->cs >= 0 && FD_ISSET(dev->cs, r)) { 135 FD_CLR(dev->cs, r); 136 log_Printf(LogTIMER, "%s: fdunset(ctrl) %d\n", p->link.name, dev->cs); 137 result = 1; 138 } else 139 result = 0; 140 141 /* Careful... physical_RemoveFromSet() called us ! */ 142 143 p->handler->removefromset = NULL; 144 result += physical_RemoveFromSet(p, r, w, e); 145 p->handler->removefromset = ether_RemoveFromSet; 146 147 return result; 148} 149 150static void 151ether_Free(struct physical *p) 152{ 153 struct etherdevice *dev = device2ether(p->handler); 154 155 physical_SetDescriptor(p); 156 if (dev->cs != -1) 157 close(dev->cs); 158 free(dev); 159} 160 161static const char * 162ether_OpenInfo(struct physical *p) 163{ 164 struct etherdevice *dev = device2ether(p->handler); 165 166 switch (dev->connected) { 167 case CARRIER_PENDING: 168 return "negotiating"; 169 case CARRIER_OK: 170 return "established"; 171 } 172 173 return "disconnected"; 174} 175 176static void 177ether_device2iov(struct device *d, struct iovec *iov, int *niov, 178 int maxiov, int *auxfd, int *nauxfd) 179{ 180 struct etherdevice *dev = device2ether(d); 181 int sz = physical_MaxDeviceSize(); 182 183 iov[*niov].iov_base = realloc(d, sz); 184 if (iov[*niov].iov_base == NULL) { 185 log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz); 186 AbortProgram(EX_OSERR); 187 } 188 iov[*niov].iov_len = sz; 189 (*niov)++; 190 191 if (dev->cs >= 0) { 192 *auxfd = dev->cs; 193 (*nauxfd)++; 194 } 195} 196 197static void 198ether_MessageIn(struct etherdevice *dev) 199{ 200 char msgbuf[sizeof(struct ng_mesg) + sizeof(struct ngpppoe_sts)]; 201 struct ng_mesg *rep = (struct ng_mesg *)msgbuf; 202 struct ngpppoe_sts *sts = (struct ngpppoe_sts *)(msgbuf + sizeof *rep); 203 char unknown[14]; 204 const char *msg; 205 struct timeval t; 206 fd_set *r; 207 int ret; 208 209 if (dev->cs < 0) 210 return; 211 212 if ((r = mkfdset()) == NULL) { 213 log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n"); 214 return; 215 } 216 zerofdset(r); 217 FD_SET(dev->cs, r); 218 t.tv_sec = t.tv_usec = 0; 219 ret = select(dev->cs + 1, r, NULL, NULL, &t); 220 free(r); 221 222 if (ret <= 0) 223 return; 224 225 if (NgRecvMsg(dev->cs, rep, sizeof msgbuf, NULL) < 0) 226 return; 227 228 if (rep->header.version != NG_VERSION) { 229 log_Printf(LogWARN, "%ld: Unexpected netgraph version, expected %ld\n", 230 (long)rep->header.version, (long)NG_VERSION); 231 return; 232 } 233 234 if (rep->header.typecookie != NGM_PPPOE_COOKIE) { 235 log_Printf(LogWARN, "%ld: Unexpected netgraph cookie, expected %ld\n", 236 (long)rep->header.typecookie, (long)NGM_PPPOE_COOKIE); 237 return; 238 } 239 240 switch (rep->header.cmd) { 241 case NGM_PPPOE_SET_FLAG: msg = "SET_FLAG"; break; 242 case NGM_PPPOE_CONNECT: msg = "CONNECT"; break; 243 case NGM_PPPOE_LISTEN: msg = "LISTEN"; break; 244 case NGM_PPPOE_OFFER: msg = "OFFER"; break; 245 case NGM_PPPOE_SUCCESS: msg = "SUCCESS"; break; 246 case NGM_PPPOE_FAIL: msg = "FAIL"; break; 247 case NGM_PPPOE_CLOSE: msg = "CLOSE"; break; 248 case NGM_PPPOE_GET_STATUS: msg = "GET_STATUS"; break; 249 default: 250 snprintf(unknown, sizeof unknown, "<%d>", (int)rep->header.cmd); 251 msg = unknown; 252 break; 253 } 254 255 log_Printf(LogPHASE, "Received NGM_PPPOE_%s (hook \"%s\")\n", msg, sts->hook); 256 257 switch (rep->header.cmd) { 258 case NGM_PPPOE_SUCCESS: 259 dev->connected = CARRIER_OK; 260 break; 261 case NGM_PPPOE_FAIL: 262 case NGM_PPPOE_CLOSE: 263 dev->connected = CARRIER_LOST; 264 break; 265 } 266} 267 268static int 269ether_AwaitCarrier(struct physical *p) 270{ 271 struct etherdevice *dev = device2ether(p->handler); 272 273 if (dev->connected != CARRIER_OK && !dev->timeout--) 274 dev->connected = CARRIER_LOST; 275 else if (dev->connected == CARRIER_PENDING) 276 ether_MessageIn(dev); 277 278 return dev->connected; 279} 280 281static const struct device baseetherdevice = { 282 ETHER_DEVICE, 283 "ether", 284 { CD_REQUIRED, DEF_ETHERCDDELAY }, 285 ether_AwaitCarrier, 286 ether_RemoveFromSet, 287 NULL, 288 NULL, 289 NULL, 290 NULL, 291 ether_Free, 292 ether_Read, 293 ether_Write, 294 ether_device2iov, 295 NULL, 296 ether_OpenInfo 297}; 298 299struct device * 300ether_iov2device(int type, struct physical *p, struct iovec *iov, int *niov, 301 int maxiov, int *auxfd, int *nauxfd) 302{ 303 if (type == ETHER_DEVICE) { 304 struct etherdevice *dev = (struct etherdevice *)iov[(*niov)++].iov_base; 305 306 dev = realloc(dev, sizeof *dev); /* Reduce to the correct size */ 307 if (dev == NULL) { 308 log_Printf(LogALERT, "Failed to allocate memory: %d\n", 309 (int)(sizeof *dev)); 310 AbortProgram(EX_OSERR); 311 } 312 313 if (*nauxfd) { 314 dev->cs = *auxfd; 315 (*nauxfd)--; 316 } else 317 dev->cs = -1; 318 319 /* Refresh function pointers etc */ 320 memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev); 321 322 physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF); 323 return &dev->dev; 324 } 325 326 return NULL; 327} 328 329static int 330ether_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n) 331{ 332 struct physical *p = descriptor2physical(d); 333 struct etherdevice *dev = device2ether(p->handler); 334 int result; 335 336 if (r && dev->cs >= 0) { 337 FD_SET(dev->cs, r); 338 log_Printf(LogTIMER, "%s(ctrl): fdset(r) %d\n", p->link.name, dev->cs); 339 result = 1; 340 } else 341 result = 0; 342 343 result += physical_doUpdateSet(d, r, w, e, n, 0); 344 345 return result; 346} 347 348static int 349ether_IsSet(struct fdescriptor *d, const fd_set *fdset) 350{ 351 struct physical *p = descriptor2physical(d); 352 struct etherdevice *dev = device2ether(p->handler); 353 int result; 354 355 result = dev->cs >= 0 && FD_ISSET(dev->cs, fdset); 356 result += physical_IsSet(d, fdset); 357 358 return result; 359} 360 361static void 362ether_DescriptorRead(struct fdescriptor *d, struct bundle *bundle, 363 const fd_set *fdset) 364{ 365 struct physical *p = descriptor2physical(d); 366 struct etherdevice *dev = device2ether(p->handler); 367 368 if (dev->cs >= 0 && FD_ISSET(dev->cs, fdset)) { 369 ether_MessageIn(dev); 370 if (dev->connected == CARRIER_LOST) { 371 log_Printf(LogPHASE, "%s: Device disconnected\n", p->link.name); 372 datalink_Down(p->dl, CLOSE_NORMAL); 373 return; 374 } 375 } 376 377 if (physical_IsSet(d, fdset)) 378 physical_DescriptorRead(d, bundle, fdset); 379} 380 381static struct device * 382ether_Abandon(struct etherdevice *dev, struct physical *p) 383{ 384 /* Abandon our node construction */ 385 close(dev->cs); 386 close(p->fd); 387 p->fd = -2; /* Nobody else need try.. */ 388 free(dev); 389 390 return NULL; 391} 392 393struct device * 394ether_Create(struct physical *p) 395{ 396 u_char rbuf[2048]; 397 struct etherdevice *dev; 398 struct ng_mesg *resp; 399 const struct hooklist *hlist; 400 const struct nodeinfo *ninfo; 401 int f; 402 403 dev = NULL; 404 if (p->fd < 0 && !strncasecmp(p->name.full, NG_PPPOE_NODE_TYPE, 405 PPPOE_NODE_TYPE_LEN) && 406 p->name.full[PPPOE_NODE_TYPE_LEN] == ':') { 407 const struct linkinfo *nlink; 408 struct ngpppoe_init_data *data; 409 struct ngm_mkpeer mkp; 410 struct ngm_connect ngc; 411 const char *iface, *provider; 412 char *path, etherid[12]; 413 int ifacelen, providerlen; 414 char connectpath[sizeof dev->hook + 2]; /* .:<hook> */ 415 416 p->fd--; /* We own the device - change fd */ 417 418#if defined(__FreeBSD__) && !defined(NOKLDLOAD) 419 if (modfind("netgraph") == -1) { 420 log_Printf(LogWARN, "Netgraph is not built into the kernel\n"); 421 return NULL; 422 } 423 424 if (modfind("ng_ether") == -1 && ID0kldload("ng_ether") == -1) 425 /* 426 * Don't treat this as an error as older kernels have this stuff 427 * built in as part of the netgraph node itself. 428 */ 429 log_Printf(LogWARN, "kldload: ng_ether: %s\n", strerror(errno)); 430 431 if (modfind("ng_socket") == -1 && ID0kldload("ng_socket") == -1) { 432 log_Printf(LogWARN, "kldload: ng_socket: %s\n", strerror(errno)); 433 return NULL; 434 } 435#endif 436 437 if ((dev = malloc(sizeof *dev)) == NULL) 438 return NULL; 439 440 iface = p->name.full + PPPOE_NODE_TYPE_LEN + 1; 441 442 provider = strchr(iface, ':'); 443 if (provider) { 444 ifacelen = provider - iface; 445 provider++; 446 providerlen = strlen(provider); 447 } else { 448 ifacelen = strlen(iface); 449 provider = ""; 450 providerlen = 0; 451 } 452 453 /* 454 * We're going to do this (where tunN is our tunnel device): 455 * 456 * .---------. 457 * | ether | 458 * | <iface> | dev->cs 459 * `---------' | 460 * (orphan) p->fd | 461 * | | | 462 * | | | 463 * (ethernet) | | 464 * .---------. .-----------. 465 * | pppoe | | socket | 466 * | <iface> |(tunN)<---->(tunN)| <unnamed> | 467 * `--------- `-----------' 468 * (tunX) 469 * ^ 470 * | 471 * `--->(tunX) 472 */ 473 474 /* Create a socket node */ 475 if (ID0NgMkSockNode(NULL, &dev->cs, &p->fd) == -1) { 476 log_Printf(LogWARN, "Cannot create netgraph socket node: %s\n", 477 strerror(errno)); 478 free(dev); 479 return NULL; 480 } 481 482 /* 483 * Ask for a list of hooks attached to the "ether" node. This node should 484 * magically exist as a way of hooking stuff onto an ethernet device 485 */ 486 path = (char *)alloca(ifacelen + 2); 487 sprintf(path, "%.*s:", ifacelen, iface); 488 if (NgSendMsg(dev->cs, path, NGM_GENERIC_COOKIE, NGM_LISTHOOKS, 489 NULL, 0) < 0) { 490 log_Printf(LogWARN, "%s Cannot send a netgraph message: %s\n", 491 path, strerror(errno)); 492 return ether_Abandon(dev, p); 493 } 494 495 /* Get our list back */ 496 resp = (struct ng_mesg *)rbuf; 497 if (NgRecvMsg(dev->cs, resp, sizeof rbuf, NULL) < 0) { 498 log_Printf(LogWARN, "Cannot get netgraph response: %s\n", 499 strerror(errno)); 500 return ether_Abandon(dev, p); 501 } 502 503 hlist = (const struct hooklist *)resp->data; 504 ninfo = &hlist->nodeinfo; 505 506 /* Make sure we've got the right type of node */ 507 if (strncmp(ninfo->type, NG_ETHER_NODE_TYPE, 508 sizeof NG_ETHER_NODE_TYPE - 1)) { 509 log_Printf(LogWARN, "%s Unexpected node type ``%s'' (wanted ``" 510 NG_ETHER_NODE_TYPE "'')\n", path, ninfo->type); 511 return ether_Abandon(dev, p); 512 } 513 514 log_Printf(LogDEBUG, "List of netgraph node ``%s'' (id %x) hooks:\n", 515 path, ninfo->id); 516 517 /* look for a hook already attached. */ 518 for (f = 0; f < ninfo->hooks; f++) { 519 nlink = &hlist->link[f]; 520 521 log_Printf(LogDEBUG, " Found %s -> %s\n", nlink->ourhook, 522 nlink->peerhook); 523 524 if (!strcmp(nlink->ourhook, NG_ETHER_HOOK_ORPHAN) || 525 !strcmp(nlink->ourhook, NG_ETHER_HOOK_DIVERT)) { 526 /* 527 * Something is using the data coming out of this ``ether'' node. 528 * If it's a PPPoE node, we use that node, otherwise we complain that 529 * someone else is using the node. 530 */ 531 if (!strcmp(nlink->nodeinfo.type, NG_PPPOE_NODE_TYPE)) 532 /* Use this PPPoE node ! */ 533 snprintf(ngc.path, sizeof ngc.path, "[%x]:", nlink->nodeinfo.id); 534 else { 535 log_Printf(LogWARN, "%s Node type ``%s'' is currently active\n", 536 path, nlink->nodeinfo.type); 537 return ether_Abandon(dev, p); 538 } 539 break; 540 } 541 } 542 543 if (f == ninfo->hooks) { 544 /* 545 * Create a new ``PPPoE'' node connected to the ``ether'' node using 546 * the magic ``orphan'' and ``ethernet'' hooks 547 */ 548 snprintf(mkp.type, sizeof mkp.type, "%s", NG_PPPOE_NODE_TYPE); 549 snprintf(mkp.ourhook, sizeof mkp.ourhook, "%s", NG_ETHER_HOOK_ORPHAN); 550 snprintf(mkp.peerhook, sizeof mkp.peerhook, "%s", NG_PPPOE_HOOK_ETHERNET); 551 snprintf(etherid, sizeof etherid, "[%x]:", ninfo->id); 552 553 log_Printf(LogDEBUG, "Creating PPPoE netgraph node %s%s -> %s\n", 554 etherid, mkp.ourhook, mkp.peerhook); 555 556 if (NgSendMsg(dev->cs, etherid, NGM_GENERIC_COOKIE, 557 NGM_MKPEER, &mkp, sizeof mkp) < 0) { 558 log_Printf(LogWARN, "%s Cannot create PPPoE netgraph node: %s\n", 559 etherid, strerror(errno)); 560 return ether_Abandon(dev, p); 561 } 562 563 snprintf(ngc.path, sizeof ngc.path, "%s%s", path, NG_ETHER_HOOK_ORPHAN); 564 } 565 566 snprintf(dev->hook, sizeof dev->hook, "%s%d", 567 TUN_NAME, p->dl->bundle->unit); 568 569 /* 570 * Connect the PPPoE node to our socket node. 571 * ngc.path has already been set up 572 */ 573 snprintf(ngc.ourhook, sizeof ngc.ourhook, "%s", dev->hook); 574 memcpy(ngc.peerhook, ngc.ourhook, sizeof ngc.peerhook); 575 576 log_Printf(LogDEBUG, "Connecting netgraph socket .:%s -> %s:%s\n", 577 ngc.ourhook, ngc.path, ngc.peerhook); 578 if (NgSendMsg(dev->cs, ".:", NGM_GENERIC_COOKIE, 579 NGM_CONNECT, &ngc, sizeof ngc) < 0) { 580 log_Printf(LogWARN, "Cannot connect PPPoE and socket netgraph " 581 "nodes: %s\n", strerror(errno)); 582 return ether_Abandon(dev, p); 583 } 584 585 /* And finally, request a connection to the given provider */ 586 587 data = (struct ngpppoe_init_data *)alloca(sizeof *data + providerlen + 1); 588 589 snprintf(data->hook, sizeof data->hook, "%s", dev->hook); 590 strcpy(data->data, provider); 591 data->data_len = providerlen; 592 593 snprintf(connectpath, sizeof connectpath, ".:%s", dev->hook); 594 log_Printf(LogDEBUG, "Sending PPPOE_CONNECT to %s\n", connectpath); 595 if (NgSendMsg(dev->cs, connectpath, NGM_PPPOE_COOKIE, 596 NGM_PPPOE_CONNECT, data, sizeof *data + providerlen) == -1) { 597 log_Printf(LogWARN, "``%s'': Cannot start netgraph node: %s\n", 598 connectpath, strerror(errno)); 599 return ether_Abandon(dev, p); 600 } 601 602 /* Hook things up so that we monitor dev->cs */ 603 p->desc.UpdateSet = ether_UpdateSet; 604 p->desc.IsSet = ether_IsSet; 605 p->desc.Read = ether_DescriptorRead; 606 607 memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev); 608 switch (p->cfg.cd.necessity) { 609 case CD_VARIABLE: 610 dev->dev.cd.delay = p->cfg.cd.delay; 611 break; 612 case CD_REQUIRED: 613 dev->dev.cd = p->cfg.cd; 614 break; 615 case CD_NOTREQUIRED: 616 log_Printf(LogWARN, "%s: Carrier must be set, using ``set cd %d!''\n", 617 p->link.name, dev->dev.cd.delay); 618 case CD_DEFAULT: 619 break; 620 } 621 622 dev->timeout = dev->dev.cd.delay; 623 dev->connected = CARRIER_PENDING; 624 625 } else { 626 /* See if we're a netgraph socket */ 627 struct sockaddr_ng ngsock; 628 struct sockaddr *sock = (struct sockaddr *)&ngsock; 629 int sz; 630 631 sz = sizeof ngsock; 632 if (getsockname(p->fd, sock, &sz) != -1 && sock->sa_family == AF_NETGRAPH) { 633 /* 634 * It's a netgraph node... We can't determine hook names etc, so we 635 * stay pretty impartial.... 636 */ 637 log_Printf(LogPHASE, "%s: Link is a netgraph node\n", p->link.name); 638 639 if ((dev = malloc(sizeof *dev)) == NULL) { 640 log_Printf(LogWARN, "%s: Cannot allocate an ether device: %s\n", 641 p->link.name, strerror(errno)); 642 return NULL; 643 } 644 645 memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev); 646 dev->cs = -1; 647 dev->timeout = 0; 648 dev->connected = CARRIER_OK; 649 *dev->hook = '\0'; 650 } 651 } 652 653 if (dev) { 654 physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF); 655 656 /* Moan about (and fix) invalid LCP configurations */ 657 if (p->link.lcp.cfg.mru > 1492) { 658 log_Printf(LogWARN, "%s: Reducing MRU to 1492\n", p->link.name); 659 p->link.lcp.cfg.mru = 1492; 660 } 661 if (p->dl->bundle->cfg.mtu > 1492) { 662 log_Printf(LogWARN, "%s: Reducing MTU to 1492\n", p->link.name); 663 p->dl->bundle->cfg.mtu = 1492; 664 } 665 666 return &dev->dev; 667 } 668 669 return NULL; 670} 671