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 * $FreeBSD$ 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 95 struct 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) 105 106 int 107 ether_DeviceSize(void) 108 { 109 return sizeof(struct etherdevice); 110 } 111 112 static ssize_t 113 ether_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 } 119 120 static ssize_t 121 ether_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 } 127 128 static int 129 ether_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 } 149 150 static void 151 ether_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 } 160 161 static const char * 162 ether_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 } 175 176 static void 177 ether_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 } 196 197 static void 198 ether_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; 207 208 if (dev->cs < 0) 209 return; 210 211 FD_ZERO(&r); 212 FD_SET(dev->cs, &r); 213 t.tv_sec = t.tv_usec = 0; 214 if (select(dev->cs + 1, &r, NULL, NULL, &t) <= 0) 215 return; 216 217 if (NgRecvMsg(dev->cs, rep, sizeof msgbuf, NULL) < 0) 218 return; 219 220 if (rep->header.version != NG_VERSION) { 221 log_Printf(LogWARN, "%ld: Unexpected netgraph version, expected %ld\n", 222 (long)rep->header.version, (long)NG_VERSION); 223 return; 224 } 225 226 if (rep->header.typecookie != NGM_PPPOE_COOKIE) { 227 log_Printf(LogWARN, "%ld: Unexpected netgraph cookie, expected %ld\n", 228 (long)rep->header.typecookie, (long)NGM_PPPOE_COOKIE); 229 return; 230 } 231 232 switch (rep->header.cmd) { 233 case NGM_PPPOE_SET_FLAG: msg = "SET_FLAG"; break; 234 case NGM_PPPOE_CONNECT: msg = "CONNECT"; break; 235 case NGM_PPPOE_LISTEN: msg = "LISTEN"; break; 236 case NGM_PPPOE_OFFER: msg = "OFFER"; break; 237 case NGM_PPPOE_SUCCESS: msg = "SUCCESS"; break; 238 case NGM_PPPOE_FAIL: msg = "FAIL"; break; 239 case NGM_PPPOE_CLOSE: msg = "CLOSE"; break; 240 case NGM_PPPOE_GET_STATUS: msg = "GET_STATUS"; break; 241 default: 242 snprintf(unknown, sizeof unknown, "<%d>", (int)rep->header.cmd); 243 msg = unknown; 244 break; 245 } 246 247 log_Printf(LogPHASE, "Received NGM_PPPOE_%s (hook \"%s\")\n", msg, sts->hook); 248 249 switch (rep->header.cmd) { 250 case NGM_PPPOE_SUCCESS: 251 dev->connected = CARRIER_OK; 252 break; 253 case NGM_PPPOE_FAIL: 254 case NGM_PPPOE_CLOSE: 255 dev->connected = CARRIER_LOST; 256 break; 257 } 258 } 259 260 static int 261 ether_AwaitCarrier(struct physical *p) 262 { 263 struct etherdevice *dev = device2ether(p->handler); 264 265 if (dev->connected != CARRIER_OK && !dev->timeout--) 266 dev->connected = CARRIER_LOST; 267 else if (dev->connected == CARRIER_PENDING) 268 ether_MessageIn(dev); 269 270 return dev->connected; 271 } 272 273 static const struct device baseetherdevice = { 274 ETHER_DEVICE, 275 "ether", 276 { CD_REQUIRED, DEF_ETHERCDDELAY }, 277 ether_AwaitCarrier, 278 ether_RemoveFromSet, 279 NULL, 280 NULL, 281 NULL, 282 NULL, 283 ether_Free, 284 ether_Read, 285 ether_Write, 286 ether_device2iov, 287 NULL, 288 ether_OpenInfo 289 }; 290 291 struct device * 292 ether_iov2device(int type, struct physical *p, struct iovec *iov, int *niov, 293 int maxiov, int *auxfd, int *nauxfd) 294 { 295 if (type == ETHER_DEVICE) { 296 struct etherdevice *dev = (struct etherdevice *)iov[(*niov)++].iov_base; 297 298 dev = realloc(dev, sizeof *dev); /* Reduce to the correct size */ 299 if (dev == NULL) { 300 log_Printf(LogALERT, "Failed to allocate memory: %d\n", 301 (int)(sizeof *dev)); 302 AbortProgram(EX_OSERR); 303 } 304 305 if (*nauxfd) { 306 dev->cs = *auxfd; 307 (*nauxfd)--; 308 } else 309 dev->cs = -1; 310 311 /* Refresh function pointers etc */ 312 memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev); 313 314 physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF); 315 return &dev->dev; 316 } 317 318 return NULL; 319 } 320 321 static int 322 ether_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n) 323 { 324 struct physical *p = descriptor2physical(d); 325 struct etherdevice *dev = device2ether(p->handler); 326 int result; 327 328 if (r && dev->cs >= 0) { 329 FD_SET(dev->cs, r); 330 log_Printf(LogTIMER, "%s(ctrl): fdset(r) %d\n", p->link.name, dev->cs); 331 result = 1; 332 } else 333 result = 0; 334 335 result += physical_doUpdateSet(d, r, w, e, n, 0); 336 337 return result; 338 } 339 340 static int 341 ether_IsSet(struct fdescriptor *d, const fd_set *fdset) 342 { 343 struct physical *p = descriptor2physical(d); 344 struct etherdevice *dev = device2ether(p->handler); 345 int result; 346 347 result = dev->cs >= 0 && FD_ISSET(dev->cs, fdset); 348 result += physical_IsSet(d, fdset); 349 350 return result; 351 } 352 353 static void 354 ether_DescriptorRead(struct fdescriptor *d, struct bundle *bundle, 355 const fd_set *fdset) 356 { 357 struct physical *p = descriptor2physical(d); 358 struct etherdevice *dev = device2ether(p->handler); 359 360 if (dev->cs >= 0 && FD_ISSET(dev->cs, fdset)) { 361 ether_MessageIn(dev); 362 if (dev->connected == CARRIER_LOST) { 363 log_Printf(LogPHASE, "%s: Device disconnected\n", p->link.name); 364 datalink_Down(p->dl, CLOSE_NORMAL); 365 return; 366 } 367 } 368 369 if (physical_IsSet(d, fdset)) 370 physical_DescriptorRead(d, bundle, fdset); 371 } 372 373 static struct device * 374 ether_Abandon(struct etherdevice *dev, struct physical *p) 375 { 376 /* Abandon our node construction */ 377 close(dev->cs); 378 close(p->fd); 379 p->fd = -2; /* Nobody else need try.. */ 380 free(dev); 381 382 return NULL; 383 } 384 385 struct device * 386 ether_Create(struct physical *p) 387 { 388 u_char rbuf[2048]; 389 struct etherdevice *dev; 390 struct ng_mesg *resp; 391 const struct hooklist *hlist; 392 const struct nodeinfo *ninfo; 393 int f; 394 395 dev = NULL; 396 if (p->fd < 0 && !strncasecmp(p->name.full, NG_PPPOE_NODE_TYPE, 397 PPPOE_NODE_TYPE_LEN) && 398 p->name.full[PPPOE_NODE_TYPE_LEN] == ':') { 399 const struct linkinfo *nlink; 400 struct ngpppoe_init_data *data; 401 struct ngm_mkpeer mkp; 402 struct ngm_connect ngc; 403 const char *iface, *provider; 404 char *path, etherid[12]; 405 int ifacelen, providerlen; 406 char connectpath[sizeof dev->hook + 2]; /* .:<hook> */ 407 408 p->fd--; /* We own the device - change fd */ 409 410 #if defined(__FreeBSD__) && !defined(NOKLDLOAD) 411 if (modfind("netgraph") == -1) { 412 log_Printf(LogWARN, "Netgraph is not built into the kernel\n"); 413 return NULL; 414 } 415 416 if (modfind("ng_ether") == -1 && ID0kldload("ng_ether") == -1) 417 /* 418 * Don't treat this as an error as older kernels have this stuff 419 * built in as part of the netgraph node itself. 420 */ 421 log_Printf(LogWARN, "kldload: ng_ether: %s\n", strerror(errno)); 422 423 if (modfind("ng_socket") == -1 && ID0kldload("ng_socket") == -1) { 424 log_Printf(LogWARN, "kldload: ng_socket: %s\n", strerror(errno)); 425 return NULL; 426 } 427 #endif 428 429 if ((dev = malloc(sizeof *dev)) == NULL) 430 return NULL; 431 432 iface = p->name.full + PPPOE_NODE_TYPE_LEN + 1; 433 434 provider = strchr(iface, ':'); 435 if (provider) { 436 ifacelen = provider - iface; 437 provider++; 438 providerlen = strlen(provider); 439 } else { 440 ifacelen = strlen(iface); 441 provider = ""; 442 providerlen = 0; 443 } 444 445 /* 446 * We're going to do this (where tunN is our tunnel device): 447 * 448 * .---------. 449 * | ether | 450 * | <iface> | dev->cs 451 * `---------' | 452 * (orphan) p->fd | 453 * | | | 454 * | | | 455 * (ethernet) | | 456 * .---------. .-----------. 457 * | pppoe | | socket | 458 * | <iface> |(tunN)<---->(tunN)| <unnamed> | 459 * `--------- `-----------' 460 * (tunX) 461 * ^ 462 * | 463 * `--->(tunX) 464 */ 465 466 /* Create a socket node */ 467 if (ID0NgMkSockNode(NULL, &dev->cs, &p->fd) == -1) { 468 log_Printf(LogWARN, "Cannot create netgraph socket node: %s\n", 469 strerror(errno)); 470 free(dev); 471 return NULL; 472 } 473 474 /* 475 * Ask for a list of hooks attached to the "ether" node. This node should 476 * magically exist as a way of hooking stuff onto an ethernet device 477 */ 478 path = (char *)alloca(ifacelen + 2); 479 sprintf(path, "%.*s:", ifacelen, iface); 480 if (NgSendMsg(dev->cs, path, NGM_GENERIC_COOKIE, NGM_LISTHOOKS, 481 NULL, 0) < 0) { 482 log_Printf(LogWARN, "%s Cannot send a netgraph message: %s\n", 483 path, strerror(errno)); 484 return ether_Abandon(dev, p); 485 } 486 487 /* Get our list back */ 488 resp = (struct ng_mesg *)rbuf; 489 if (NgRecvMsg(dev->cs, resp, sizeof rbuf, NULL) < 0) { 490 log_Printf(LogWARN, "Cannot get netgraph response: %s\n", 491 strerror(errno)); 492 return ether_Abandon(dev, p); 493 } 494 495 hlist = (const struct hooklist *)resp->data; 496 ninfo = &hlist->nodeinfo; 497 498 /* Make sure we've got the right type of node */ 499 if (strncmp(ninfo->type, NG_ETHER_NODE_TYPE, 500 sizeof NG_ETHER_NODE_TYPE - 1)) { 501 log_Printf(LogWARN, "%s Unexpected node type ``%s'' (wanted ``" 502 NG_ETHER_NODE_TYPE "'')\n", path, ninfo->type); 503 return ether_Abandon(dev, p); 504 } 505 506 log_Printf(LogDEBUG, "List of netgraph node ``%s'' (id %x) hooks:\n", 507 path, ninfo->id); 508 509 /* look for a hook already attached. */ 510 for (f = 0; f < ninfo->hooks; f++) { 511 nlink = &hlist->link[f]; 512 513 log_Printf(LogDEBUG, " Found %s -> %s\n", nlink->ourhook, 514 nlink->peerhook); 515 516 if (!strcmp(nlink->ourhook, NG_ETHER_HOOK_ORPHAN) || 517 !strcmp(nlink->ourhook, NG_ETHER_HOOK_DIVERT)) { 518 /* 519 * Something is using the data coming out of this ``ether'' node. 520 * If it's a PPPoE node, we use that node, otherwise we complain that 521 * someone else is using the node. 522 */ 523 if (!strcmp(nlink->nodeinfo.type, NG_PPPOE_NODE_TYPE)) 524 /* Use this PPPoE node ! */ 525 snprintf(ngc.path, sizeof ngc.path, "[%x]:", nlink->nodeinfo.id); 526 else { 527 log_Printf(LogWARN, "%s Node type ``%s'' is currently active\n", 528 path, nlink->nodeinfo.type); 529 return ether_Abandon(dev, p); 530 } 531 break; 532 } 533 } 534 535 if (f == ninfo->hooks) { 536 /* 537 * Create a new ``PPPoE'' node connected to the ``ether'' node using 538 * the magic ``orphan'' and ``ethernet'' hooks 539 */ 540 snprintf(mkp.type, sizeof mkp.type, "%s", NG_PPPOE_NODE_TYPE); 541 snprintf(mkp.ourhook, sizeof mkp.ourhook, "%s", NG_ETHER_HOOK_ORPHAN); 542 snprintf(mkp.peerhook, sizeof mkp.peerhook, "%s", NG_PPPOE_HOOK_ETHERNET); 543 snprintf(etherid, sizeof etherid, "[%x]:", ninfo->id); 544 545 log_Printf(LogDEBUG, "Creating PPPoE netgraph node %s%s -> %s\n", 546 etherid, mkp.ourhook, mkp.peerhook); 547 548 if (NgSendMsg(dev->cs, etherid, NGM_GENERIC_COOKIE, 549 NGM_MKPEER, &mkp, sizeof mkp) < 0) { 550 log_Printf(LogWARN, "%s Cannot create PPPoE netgraph node: %s\n", 551 etherid, strerror(errno)); 552 return ether_Abandon(dev, p); 553 } 554 555 snprintf(ngc.path, sizeof ngc.path, "%s%s", path, NG_ETHER_HOOK_ORPHAN); 556 } 557 558 snprintf(dev->hook, sizeof dev->hook, "%s%d", 559 TUN_NAME, p->dl->bundle->unit); 560 561 /* 562 * Connect the PPPoE node to our socket node. 563 * ngc.path has already been set up 564 */ 565 snprintf(ngc.ourhook, sizeof ngc.ourhook, "%s", dev->hook); 566 memcpy(ngc.peerhook, ngc.ourhook, sizeof ngc.peerhook); 567 568 log_Printf(LogDEBUG, "Connecting netgraph socket .:%s -> %s:%s\n", 569 ngc.ourhook, ngc.path, ngc.peerhook); 570 if (NgSendMsg(dev->cs, ".:", NGM_GENERIC_COOKIE, 571 NGM_CONNECT, &ngc, sizeof ngc) < 0) { 572 log_Printf(LogWARN, "Cannot connect PPPoE and socket netgraph " 573 "nodes: %s\n", strerror(errno)); 574 return ether_Abandon(dev, p); 575 } 576 577 /* And finally, request a connection to the given provider */ 578 579 data = (struct ngpppoe_init_data *)alloca(sizeof *data + providerlen + 1); 580 581 snprintf(data->hook, sizeof data->hook, "%s", dev->hook); 582 strcpy(data->data, provider); 583 data->data_len = providerlen; 584 585 snprintf(connectpath, sizeof connectpath, ".:%s", dev->hook); 586 log_Printf(LogDEBUG, "Sending PPPOE_CONNECT to %s\n", connectpath); 587 if (NgSendMsg(dev->cs, connectpath, NGM_PPPOE_COOKIE, 588 NGM_PPPOE_CONNECT, data, sizeof *data + providerlen) == -1) { 589 log_Printf(LogWARN, "``%s'': Cannot start netgraph node: %s\n", 590 connectpath, strerror(errno)); 591 return ether_Abandon(dev, p); 592 } 593 594 /* Hook things up so that we monitor dev->cs */ 595 p->desc.UpdateSet = ether_UpdateSet; 596 p->desc.IsSet = ether_IsSet; 597 p->desc.Read = ether_DescriptorRead; 598 599 memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev); 600 switch (p->cfg.cd.necessity) { 601 case CD_VARIABLE: 602 dev->dev.cd.delay = p->cfg.cd.delay; 603 break; 604 case CD_REQUIRED: 605 dev->dev.cd = p->cfg.cd; 606 break; 607 case CD_NOTREQUIRED: 608 log_Printf(LogWARN, "%s: Carrier must be set, using ``set cd %d!''\n", 609 p->link.name, dev->dev.cd.delay); 610 case CD_DEFAULT: 611 break; 612 } 613 614 dev->timeout = dev->dev.cd.delay; 615 dev->connected = CARRIER_PENDING; 616 617 } else { 618 /* See if we're a netgraph socket */ 619 struct sockaddr_ng ngsock; 620 struct sockaddr *sock = (struct sockaddr *)&ngsock; 621 int sz; 622 623 sz = sizeof ngsock; 624 if (getsockname(p->fd, sock, &sz) != -1 && sock->sa_family == AF_NETGRAPH) { 625 /* 626 * It's a netgraph node... We can't determine hook names etc, so we 627 * stay pretty impartial.... 628 */ 629 log_Printf(LogPHASE, "%s: Link is a netgraph node\n", p->link.name); 630 631 if ((dev = malloc(sizeof *dev)) == NULL) { 632 log_Printf(LogWARN, "%s: Cannot allocate an ether device: %s\n", 633 p->link.name, strerror(errno)); 634 return NULL; 635 } 636 637 memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev); 638 dev->cs = -1; 639 dev->timeout = 0; 640 dev->connected = CARRIER_OK; 641 *dev->hook = '\0'; 642 } 643 } 644 645 if (dev) { 646 physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF); 647 648 /* Moan about (and fix) invalid LCP configurations */ 649 if (p->link.lcp.cfg.mru > 1492) { 650 log_Printf(LogWARN, "%s: Reducing MRU to 1492\n", p->link.name); 651 p->link.lcp.cfg.mru = 1492; 652 } 653 if (p->dl->bundle->cfg.mtu > 1492) { 654 log_Printf(LogWARN, "%s: Reducing MTU to 1492\n", p->link.name); 655 p->dl->bundle->cfg.mtu = 1492; 656 } 657 658 return &dev->dev; 659 } 660 661 return NULL; 662 } 663