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 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 } 267 268 static int 269 ether_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 } 280 281 static 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 }; 298 299 struct device * 300 ether_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 } 328 329 static int 330 ether_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 } 347 348 static int 349 ether_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 } 360 361 static void 362 ether_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 } 380 381 static struct device * 382 ether_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 } 392 393 struct device * 394 ether_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); 588 snprintf(data->hook, sizeof data->hook, "%s", dev->hook); 589 memcpy(data->data, provider, providerlen); 590 data->data_len = providerlen; 591 592 snprintf(connectpath, sizeof connectpath, ".:%s", dev->hook); 593 log_Printf(LogDEBUG, "Sending PPPOE_CONNECT to %s\n", connectpath); 594 if (NgSendMsg(dev->cs, connectpath, NGM_PPPOE_COOKIE, 595 NGM_PPPOE_CONNECT, data, sizeof *data + providerlen) == -1) { 596 log_Printf(LogWARN, "``%s'': Cannot start netgraph node: %s\n", 597 connectpath, strerror(errno)); 598 return ether_Abandon(dev, p); 599 } 600 601 /* Hook things up so that we monitor dev->cs */ 602 p->desc.UpdateSet = ether_UpdateSet; 603 p->desc.IsSet = ether_IsSet; 604 p->desc.Read = ether_DescriptorRead; 605 606 memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev); 607 switch (p->cfg.cd.necessity) { 608 case CD_VARIABLE: 609 dev->dev.cd.delay = p->cfg.cd.delay; 610 break; 611 case CD_REQUIRED: 612 dev->dev.cd = p->cfg.cd; 613 break; 614 case CD_NOTREQUIRED: 615 log_Printf(LogWARN, "%s: Carrier must be set, using ``set cd %d!''\n", 616 p->link.name, dev->dev.cd.delay); 617 case CD_DEFAULT: 618 break; 619 } 620 621 dev->timeout = dev->dev.cd.delay; 622 dev->connected = CARRIER_PENDING; 623 624 } else { 625 /* See if we're a netgraph socket */ 626 struct sockaddr_ng ngsock; 627 struct sockaddr *sock = (struct sockaddr *)&ngsock; 628 int sz; 629 630 sz = sizeof ngsock; 631 if (getsockname(p->fd, sock, &sz) != -1 && sock->sa_family == AF_NETGRAPH) { 632 /* 633 * It's a netgraph node... We can't determine hook names etc, so we 634 * stay pretty impartial.... 635 */ 636 log_Printf(LogPHASE, "%s: Link is a netgraph node\n", p->link.name); 637 638 if ((dev = malloc(sizeof *dev)) == NULL) { 639 log_Printf(LogWARN, "%s: Cannot allocate an ether device: %s\n", 640 p->link.name, strerror(errno)); 641 return NULL; 642 } 643 644 memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev); 645 dev->cs = -1; 646 dev->timeout = 0; 647 dev->connected = CARRIER_OK; 648 *dev->hook = '\0'; 649 } 650 } 651 652 if (dev) { 653 physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF); 654 655 /* Moan about (and fix) invalid LCP configurations */ 656 if (p->link.lcp.cfg.mru > 1492) { 657 log_Printf(LogWARN, "%s: Reducing MRU to 1492\n", p->link.name); 658 p->link.lcp.cfg.mru = 1492; 659 } 660 if (p->dl->bundle->cfg.mtu > 1492) { 661 log_Printf(LogWARN, "%s: Reducing MTU to 1492\n", p->link.name); 662 p->dl->bundle->cfg.mtu = 1492; 663 } 664 665 return &dev->dev; 666 } 667 668 return NULL; 669 } 670