ether.c revision 53062
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 53062 1999-11-09 19:05:48Z 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#endif 53#include <sys/uio.h> 54#include <termios.h> 55#ifndef NONBLOCK_FIXED 56#include <sys/time.h> 57#endif 58#include <unistd.h> 59 60#include "layer.h" 61#include "defs.h" 62#include "mbuf.h" 63#include "log.h" 64#include "timer.h" 65#include "lqr.h" 66#include "hdlc.h" 67#include "throughput.h" 68#include "fsm.h" 69#include "lcp.h" 70#include "ccp.h" 71#include "link.h" 72#include "async.h" 73#include "descriptor.h" 74#include "physical.h" 75#include "main.h" 76#include "mp.h" 77#include "chat.h" 78#include "auth.h" 79#include "chap.h" 80#include "cbcp.h" 81#include "datalink.h" 82#include "slcompress.h" 83#include "iplist.h" 84#include "ipcp.h" 85#include "filter.h" 86#ifndef NORADIUS 87#include "radius.h" 88#endif 89#include "bundle.h" 90#include "id.h" 91#include "ether.h" 92 93 94#define PPPOE_NODE_TYPE_LEN (sizeof NG_PPPOE_NODE_TYPE - 1) /* "PPPoE" */ 95 96struct etherdevice { 97 struct device dev; /* What struct physical knows about */ 98 int cs; /* Control socket */ 99 int connected; /* Are we connected yet ? */ 100 int timeout; /* Seconds attempting to connect */ 101 char hook[sizeof TUN_NAME + 11]; /* Our socket node hook */ 102}; 103 104#define device2ether(d) \ 105 ((d)->type == ETHER_DEVICE ? (struct etherdevice *)d : NULL) 106 107int 108ether_DeviceSize(void) 109{ 110 return sizeof(struct etherdevice); 111} 112 113static ssize_t 114ether_Write(struct physical *p, const void *v, size_t n) 115{ 116 struct etherdevice *dev = device2ether(p->handler); 117 118 return NgSendData(p->fd, dev->hook, v, n) == -1 ? -1 : n; 119} 120 121static ssize_t 122ether_Read(struct physical *p, void *v, size_t n) 123{ 124 char hook[sizeof TUN_NAME + 11]; 125 126 return NgRecvData(p->fd, v, n, hook); 127} 128 129static int 130ether_RemoveFromSet(struct physical *p, fd_set *r, fd_set *w, fd_set *e) 131{ 132 struct etherdevice *dev = device2ether(p->handler); 133 int result; 134 135 if (r && dev->cs >= 0 && FD_ISSET(dev->cs, r)) { 136 FD_CLR(dev->cs, r); 137 log_Printf(LogTIMER, "%s: fdunset(ctrl) %d\n", p->link.name, dev->cs); 138 result = 1; 139 } else 140 result = 0; 141 142 /* Careful... physical_RemoveFromSet() called us ! */ 143 144 p->handler->removefromset = NULL; 145 result += physical_RemoveFromSet(p, r, w, e); 146 p->handler->removefromset = ether_RemoveFromSet; 147 148 return result; 149} 150 151static void 152ether_Free(struct physical *p) 153{ 154 struct etherdevice *dev = device2ether(p->handler); 155 156 physical_SetDescriptor(p); 157 if (dev->cs != -1) 158 close(dev->cs); 159 free(dev); 160} 161 162static const char * 163ether_OpenInfo(struct physical *p) 164{ 165 struct etherdevice *dev = device2ether(p->handler); 166 167 switch (dev->connected) { 168 case CARRIER_PENDING: 169 return "negotiating"; 170 case CARRIER_OK: 171 return "established"; 172 } 173 174 return "disconnected"; 175} 176 177static void 178ether_device2iov(struct device *d, struct iovec *iov, int *niov, 179 int maxiov, int *auxfd, int *nauxfd, pid_t newpid) 180{ 181 struct etherdevice *dev = device2ether(d); 182 int sz = physical_MaxDeviceSize(); 183 184 iov[*niov].iov_base = realloc(d, sz); 185 if (iov[*niov].iov_base == NULL) { 186 log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz); 187 AbortProgram(EX_OSERR); 188 } 189 iov[*niov].iov_len = sz; 190 (*niov)++; 191 192 if (dev->cs >= 0) { 193 *auxfd = dev->cs; 194 (*nauxfd)++; 195 } 196} 197 198static void 199ether_MessageIn(struct etherdevice *dev) 200{ 201 char msgbuf[sizeof(struct ng_mesg) + sizeof(struct ngpppoe_sts)]; 202 struct ng_mesg *rep = (struct ng_mesg *)msgbuf; 203 struct ngpppoe_sts *sts = (struct ngpppoe_sts *)(msgbuf + sizeof *rep); 204 char unknown[14]; 205 const char *msg; 206#ifndef NONBLOCK_FIXED 207 struct timeval t; 208 fd_set r; 209#endif 210 211 if (dev->cs < 0) 212 return; 213 214#ifndef NONBLOCK_FIXED 215 FD_ZERO(&r); 216 FD_SET(dev->cs, &r); 217 t.tv_sec = t.tv_usec = 0; 218 if (select(dev->cs + 1, &r, NULL, NULL, &t) <= 0) 219 return; 220#endif 221 222 if (NgRecvMsg(dev->cs, rep, sizeof msgbuf, NULL) < 0) 223 return; 224 225 if (rep->header.version != NG_VERSION) { 226 log_Printf(LogWARN, "%ld: Unexpected netgraph version, expected %ld\n", 227 (long)rep->header.version, (long)NG_VERSION); 228 return; 229 } 230 231 if (rep->header.typecookie != NGM_PPPOE_COOKIE) { 232 log_Printf(LogWARN, "%ld: Unexpected netgraph cookie, expected %ld\n", 233 (long)rep->header.typecookie, (long)NGM_PPPOE_COOKIE); 234 return; 235 } 236 237 switch (rep->header.cmd) { 238 case NGM_PPPOE_SET_FLAG: msg = "SET_FLAG"; break; 239 case NGM_PPPOE_CONNECT: msg = "CONNECT"; break; 240 case NGM_PPPOE_LISTEN: msg = "LISTEN"; break; 241 case NGM_PPPOE_OFFER: msg = "OFFER"; break; 242 case NGM_PPPOE_SUCCESS: msg = "SUCCESS"; break; 243 case NGM_PPPOE_FAIL: msg = "FAIL"; break; 244 case NGM_PPPOE_CLOSE: msg = "CLOSE"; break; 245 case NGM_PPPOE_GET_STATUS: msg = "GET_STATUS"; break; 246 default: 247 snprintf(unknown, sizeof unknown, "<%d>", (int)rep->header.cmd); 248 msg = unknown; 249 break; 250 } 251 252 log_Printf(LogPHASE, "Received NGM_PPPOE_%s (hook \"%s\")\n", msg, sts->hook); 253 254 switch (rep->header.cmd) { 255 case NGM_PPPOE_SUCCESS: 256 dev->connected = CARRIER_OK; 257 break; 258 case NGM_PPPOE_FAIL: 259 case NGM_PPPOE_CLOSE: 260 dev->connected = CARRIER_LOST; 261 break; 262 } 263} 264 265static int 266ether_AwaitCarrier(struct physical *p) 267{ 268 struct etherdevice *dev = device2ether(p->handler); 269 270 if (!dev->timeout--) 271 dev->connected = CARRIER_LOST; 272 else if (dev->connected == CARRIER_PENDING) 273 ether_MessageIn(dev); 274 275 return dev->connected; 276} 277 278static const struct device baseetherdevice = { 279 ETHER_DEVICE, 280 "ether", 281 ether_AwaitCarrier, 282 ether_RemoveFromSet, 283 NULL, 284 NULL, 285 NULL, 286 NULL, 287 ether_Free, 288 ether_Read, 289 ether_Write, 290 ether_device2iov, 291 NULL, 292 ether_OpenInfo 293}; 294 295struct device * 296ether_iov2device(int type, struct physical *p, struct iovec *iov, int *niov, 297 int maxiov, int *auxfd, int *nauxfd) 298{ 299 if (type == ETHER_DEVICE) { 300 struct etherdevice *dev = (struct etherdevice *)iov[(*niov)++].iov_base; 301 302 dev = realloc(dev, sizeof *dev); /* Reduce to the correct size */ 303 if (dev == NULL) { 304 log_Printf(LogALERT, "Failed to allocate memory: %d\n", 305 (int)(sizeof *dev)); 306 AbortProgram(EX_OSERR); 307 } 308 309 if (*nauxfd) { 310 dev->cs = *auxfd; 311 (*nauxfd)--; 312 } else 313 dev->cs = -1; 314 315 /* Refresh function pointers etc */ 316 memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev); 317 318 physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF); 319 return &dev->dev; 320 } 321 322 return NULL; 323} 324 325static int 326ether_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n) 327{ 328 struct physical *p = descriptor2physical(d); 329 struct etherdevice *dev = device2ether(p->handler); 330 int result; 331 332 if (r && dev->cs >= 0) { 333 FD_SET(dev->cs, r); 334 log_Printf(LogTIMER, "%s(ctrl): fdset(r) %d\n", p->link.name, dev->cs); 335 result = 1; 336 } else 337 result = 0; 338 339 result += physical_doUpdateSet(d, r, w, e, n, 0); 340 341 return result; 342} 343 344static int 345ether_IsSet(struct descriptor *d, const fd_set *fdset) 346{ 347 struct physical *p = descriptor2physical(d); 348 struct etherdevice *dev = device2ether(p->handler); 349 int result; 350 351 result = dev->cs >= 0 && FD_ISSET(dev->cs, fdset); 352 result += physical_IsSet(d, fdset); 353 354 return result; 355} 356 357static void 358ether_DescriptorRead(struct descriptor *d, struct bundle *bundle, 359 const fd_set *fdset) 360{ 361 struct physical *p = descriptor2physical(d); 362 struct etherdevice *dev = device2ether(p->handler); 363 364 if (dev->cs >= 0 && FD_ISSET(dev->cs, fdset)) { 365 ether_MessageIn(dev); 366 if (dev->connected == CARRIER_LOST) { 367 log_Printf(LogPHASE, "%s: Device disconnected\n", p->link.name); 368 datalink_Down(p->dl, CLOSE_NORMAL); 369 return; 370 } 371 } 372 373 if (physical_IsSet(d, fdset)) 374 physical_DescriptorRead(d, bundle, fdset); 375} 376 377static struct device * 378ether_Abandon(struct etherdevice *dev, struct physical *p) 379{ 380 /* Abandon our node construction */ 381 close(dev->cs); 382 close(p->fd); 383 p->fd = -2; /* Nobody else need try.. */ 384 free(dev); 385 386 return NULL; 387} 388 389struct device * 390ether_Create(struct physical *p) 391{ 392 u_char rbuf[2048]; 393 struct etherdevice *dev; 394 struct ng_mesg *resp; 395 const struct hooklist *hlist; 396 const struct nodeinfo *ninfo; 397 int f; 398 399 dev = NULL; 400 if (p->fd < 0 && !strncasecmp(p->name.full, NG_PPPOE_NODE_TYPE, 401 PPPOE_NODE_TYPE_LEN) && 402 p->name.full[PPPOE_NODE_TYPE_LEN] == ':') { 403 const struct linkinfo *nlink; 404 struct ngpppoe_init_data *data; 405 struct ngm_mkpeer mkp; 406 struct ngm_connect ngc; 407 const char *iface, *provider; 408 char *path, etherid[12]; 409 int ifacelen, providerlen, oldflag; 410 char connectpath[sizeof dev->hook + 2]; /* .:<hook> */ 411 412#ifdef KLDSYM_LOOKUP 413 /* First make sure we've got the right code loaded */ 414 char basesym[] = "ng_make_node", socksym[] = "ngdomain"; 415 struct kld_sym_lookup baselookup = { sizeof baselookup, basesym, 0, 0 }; 416 struct kld_sym_lookup socklookup = { sizeof socklookup, socksym, 0, 0 }; 417#endif 418 419 p->fd--; /* We own the device - change fd */ 420 421#ifdef KLDSYM_LOOKUP 422 if (kldsym(0, KLDSYM_LOOKUP, &baselookup) == -1) { 423 log_Printf(LogWARN, "Can't run without options NETGRAPH in the kernel\n"); 424 return NULL; 425 } 426 427 if (kldsym(0, KLDSYM_LOOKUP, &socklookup) == -1 && 428 ID0kldload("ng_socket") == -1) { 429 log_Printf(LogWARN, "kldload: ng_socket: %s\n", strerror(errno)); 430 return NULL; 431 } 432#endif 433 434 if ((dev = malloc(sizeof *dev)) == NULL) 435 return NULL; 436 437 iface = p->name.full + PPPOE_NODE_TYPE_LEN + 1; 438 439 provider = strchr(iface, ':'); 440 if (provider) { 441 ifacelen = provider - iface; 442 provider++; 443 providerlen = strlen(provider); 444 } else { 445 ifacelen = strlen(iface); 446 provider = ""; 447 providerlen = 0; 448 } 449 450 /* 451 * We're going to do this (where tunN is our tunnel device): 452 * 453 * .---------. 454 * | ether | 455 * | <iface> | dev->cs 456 * `---------' | 457 * (orphan) p->fd | 458 * | | | 459 * | | | 460 * (ethernet) | | 461 * .---------. .-----------. 462 * | pppoe | | socket | 463 * | <iface> |(tunN)<---->(tunN)| <unnamed> | 464 * `--------- `-----------' 465 * (tunX) 466 * ^ 467 * | 468 * `--->(tunX) 469 */ 470 471 /* Create a socket node */ 472 if (NgMkSockNode(NULL, &dev->cs, &p->fd) == -1) { 473 log_Printf(LogWARN, "Cannot create netgraph socket node: %s\n", 474 strerror(errno)); 475 free(dev); 476 return NULL; 477 } 478 479 /* 480 * Ask for a list of hooks attached to the "ether" node. This node should 481 * magically exist as a way of hooking stuff onto an ethernet device 482 */ 483 path = (char *)alloca(ifacelen + 2); 484 sprintf(path, "%.*s:", ifacelen, iface); 485 if (NgSendMsg(dev->cs, path, NGM_GENERIC_COOKIE, NGM_LISTHOOKS, 486 NULL, 0) < 0) { 487 log_Printf(LogWARN, "%s Cannot send a netgraph message: %s\n", 488 path, strerror(errno)); 489 return ether_Abandon(dev, p); 490 } 491 492 /* Get our list back */ 493 resp = (struct ng_mesg *)rbuf; 494 if (NgRecvMsg(dev->cs, resp, sizeof rbuf, NULL) < 0) { 495 log_Printf(LogWARN, "Cannot get netgraph response: %s\n", 496 strerror(errno)); 497 return ether_Abandon(dev, p); 498 } 499 500 hlist = (const struct hooklist *)resp->data; 501 ninfo = &hlist->nodeinfo; 502 503 /* Make sure we've got the right type of node */ 504 if (strncmp(ninfo->type, NG_ETHER_NODE_TYPE, 505 sizeof NG_ETHER_NODE_TYPE - 1)) { 506 log_Printf(LogWARN, "%s Unexpected node type ``%s'' (wanted ``" 507 NG_ETHER_NODE_TYPE "'')\n", path, ninfo->type); 508 return ether_Abandon(dev, p); 509 } 510 511 log_Printf(LogDEBUG, "List of netgraph node ``%s'' (id %x) hooks:\n", 512 path, ninfo->id); 513 514 /* look for a hook already attached. */ 515 for (f = 0; f < ninfo->hooks; f++) { 516 nlink = &hlist->link[f]; 517 518 log_Printf(LogDEBUG, " Found %s -> %s\n", nlink->ourhook, 519 nlink->peerhook); 520 521 if (!strcmp(nlink->ourhook, NG_ETHER_HOOK_ORPHAN) || 522 !strcmp(nlink->ourhook, NG_ETHER_HOOK_DIVERT)) { 523 /* 524 * Something is using the data coming out of this ``ether'' node. 525 * If it's a PPPoE node, we use that node, otherwise we complain that 526 * someone else is using the node. 527 */ 528 if (!strcmp(nlink->nodeinfo.type, NG_PPPOE_NODE_TYPE)) 529 /* Use this PPPoE node ! */ 530 snprintf(ngc.path, sizeof ngc.path, "[%x]:", nlink->nodeinfo.id); 531 else { 532 log_Printf(LogWARN, "%s Node type ``%s'' is currently active\n", 533 path, nlink->nodeinfo.type); 534 return ether_Abandon(dev, p); 535 } 536 break; 537 } 538 } 539 540 if (f == ninfo->hooks) { 541 /* 542 * Create a new ``PPPoE'' node connected to the ``ether'' node using 543 * the magic ``orphan'' and ``ethernet'' hooks 544 */ 545 snprintf(mkp.type, sizeof mkp.type, "%s", NG_PPPOE_NODE_TYPE); 546 snprintf(mkp.ourhook, sizeof mkp.ourhook, "%s", NG_ETHER_HOOK_ORPHAN); 547 snprintf(mkp.peerhook, sizeof mkp.peerhook, "%s", NG_PPPOE_HOOK_ETHERNET); 548 snprintf(etherid, sizeof etherid, "[%x]:", ninfo->id); 549 550 log_Printf(LogDEBUG, "Creating PPPoE netgraph node %s%s -> %s\n", 551 etherid, mkp.ourhook, mkp.peerhook); 552 553 if (NgSendMsg(dev->cs, etherid, NGM_GENERIC_COOKIE, 554 NGM_MKPEER, &mkp, sizeof mkp) < 0) { 555 log_Printf(LogWARN, "%s Cannot create PPPoE netgraph node: %s\n", 556 etherid, strerror(errno)); 557 return ether_Abandon(dev, p); 558 } 559 560 snprintf(ngc.path, sizeof ngc.path, "%s%s", path, NG_ETHER_HOOK_ORPHAN); 561 } 562 563 snprintf(dev->hook, sizeof dev->hook, "%s%d", 564 TUN_NAME, p->dl->bundle->unit); 565 566 /* 567 * Connect the PPPoE node to our socket node. 568 * ngc.path has already been set up 569 */ 570 snprintf(ngc.ourhook, sizeof ngc.ourhook, "%s", dev->hook); 571 memcpy(ngc.peerhook, ngc.ourhook, sizeof ngc.peerhook); 572 573 log_Printf(LogDEBUG, "Connecting netgraph socket .:%s -> %s:%s\n", 574 ngc.ourhook, ngc.path, ngc.peerhook); 575 if (NgSendMsg(dev->cs, ".:", NGM_GENERIC_COOKIE, 576 NGM_CONNECT, &ngc, sizeof ngc) < 0) { 577 log_Printf(LogWARN, "Cannot connect PPPoE and socket netgraph " 578 "nodes: %s\n", strerror(errno)); 579 return ether_Abandon(dev, p); 580 } 581 582 /* And finally, request a connection to the given provider */ 583 584 data = (struct ngpppoe_init_data *)alloca(sizeof *data + providerlen + 1); 585 586 snprintf(data->hook, sizeof data->hook, "%s", dev->hook); 587 strcpy(data->data, provider); 588 data->data_len = providerlen; 589 590 snprintf(connectpath, sizeof connectpath, ".:%s", dev->hook); 591 log_Printf(LogDEBUG, "Sending PPPOE_CONNECT to %s\n", connectpath); 592 if (NgSendMsg(dev->cs, connectpath, NGM_PPPOE_COOKIE, 593 NGM_PPPOE_CONNECT, data, sizeof *data + providerlen) == -1) { 594 log_Printf(LogWARN, "``%s'': Cannot start netgraph node: %s\n", 595 connectpath, strerror(errno)); 596 return ether_Abandon(dev, p); 597 } 598 599 /* 600 * Now make our control socket non-blocking so that we can read() 601 * without having to select() 602 * 603 * XXX: Does this work (#define NONBLOCK_FIXED) ? 604 */ 605 oldflag = fcntl(dev->cs, F_GETFL, 0); 606 if (oldflag < 0) { 607 log_Printf(LogWARN, "%s: Open: Cannot get physical flags: %s\n", 608 p->link.name, strerror(errno)); 609 return ether_Abandon(dev, p); 610 } else 611 fcntl(dev->cs, F_SETFL, oldflag & ~O_NONBLOCK); 612 613 dev->timeout = p->cfg.cd.delay; 614 dev->connected = CARRIER_PENDING; 615 616 /* Hook things up so that we monitor dev->cs */ 617 p->desc.UpdateSet = ether_UpdateSet; 618 p->desc.IsSet = ether_IsSet; 619 p->desc.Read = ether_DescriptorRead; 620 } else { 621 /* See if we're a netgraph socket */ 622 struct sockaddr_ng ngsock; 623 struct sockaddr *sock = (struct sockaddr *)&ngsock; 624 int sz; 625 626 sz = sizeof ngsock; 627 if (getsockname(p->fd, sock, &sz) != -1 && sock->sa_family == AF_NETGRAPH) { 628 /* 629 * It's a netgraph node... We can't determine hook names etc, so we 630 * stay pretty impartial.... 631 */ 632 log_Printf(LogPHASE, "%s: Link is a netgraph node\n", p->link.name); 633 634 if ((dev = malloc(sizeof *dev)) == NULL) { 635 log_Printf(LogWARN, "%s: Cannot allocate an ether device: %s\n", 636 p->link.name, strerror(errno)); 637 return NULL; 638 } 639 640 dev->cs = -1; 641 dev->timeout = 0; 642 dev->connected = CARRIER_OK; 643 *dev->hook = '\0'; 644 } 645 } 646 647 if (dev) { 648 memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev); 649 650 physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF); 651 652 /* Moan about (and fix) invalid LCP configurations */ 653 if (p->link.lcp.cfg.mru > 1492) { 654 log_Printf(LogWARN, "%s: Reducing MRU to 1492\n", p->link.name); 655 p->link.lcp.cfg.mru = 1492; 656 } 657 if (p->dl->bundle->cfg.mtu > 1492) { 658 log_Printf(LogWARN, "%s: Reducing MTU to 1492\n", p->link.name); 659 p->dl->bundle->cfg.mtu = 1492; 660 } 661 662 return &dev->dev; 663 } 664 665 return NULL; 666} 667