usr.sbin/ppp/ether.c

   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: src/usr.sbin/ppp/ether.c,v 1.9.2.14 2002/09/01 02:12:26 brian Exp $
  27  * $DragonFly: src/usr.sbin/ppp/ether.c,v 1.3 2003/08/08 04:18:47 dillon Exp $
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/socket.h>
  32 #include <sys/un.h>
  33 #include <netinet/in.h>
  34 #include <arpa/inet.h>
  35 #include <netdb.h>
  36 #include <netgraph.h>
  37 #include <net/ethernet.h>
  38 #include <net/if.h>
  39 #include <net/route.h>
  40 #include <netinet/in_systm.h>
  41 #include <netinet/ip.h>
  42 #include <netgraph/ether/ng_ether.h>
  43 #include <netgraph/ng_message.h>
  44 #include <netgraph/pppoe/ng_pppoe.h>
  45 #include <netgraph/socket/ng_socket.h>
  46
  47 #include <errno.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <sysexits.h>
  52 #include <sys/fcntl.h>
  53 #include <sys/stat.h>
  54 #include <sys/uio.h>
  55 #include <termios.h>
  56 #include <sys/time.h>
  57 #include <syslog.h>
  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 "ncpaddr.h"
  85 #include "ip.h"
  86 #include "ipcp.h"
  87 #include "filter.h"
  88 #ifndef NORADIUS
  89 #include "radius.h"
  90 #endif
  91 #include "ipv6cp.h"
  92 #include "ncp.h"
  93 #include "bundle.h"
  94 #include "id.h"
  95 #include "iface.h"
  96 #include "route.h"
  97 #include "ether.h"
  98
  99
 100 #define PPPOE_NODE_TYPE_LEN (sizeof NG_PPPOE_NODE_TYPE - 1) /* "PPPoE" */
 101
 102 struct etherdevice {
 103   struct device dev;                    /* What struct physical knows about */
 104   int cs;                               /* Control socket */
 105   int connected;                        /* Are we connected yet ? */
 106   int timeout;                          /* Seconds attempting to connect */
 107   char hook[sizeof TUN_NAME + 11];      /* Our socket node hook */
 108   u_int32_t slot;                       /* ifindex << 24 | unit */
 109 };
 110
 111 #define device2ether(d) \
 112   ((d)->type == ETHER_DEVICE ? (struct etherdevice *)d : NULL)
 113
 114 int
 115 ether_DeviceSize(void)
 116 {
 117   return sizeof(struct etherdevice);
 118 }
 119
 120 static ssize_t
 121 ether_Write(struct physical *p, const void *v, size_t n)
 122 {
 123   struct etherdevice *dev = device2ether(p->handler);
 124
 125   return NgSendData(p->fd, dev->hook, v, n) == -1 ? -1 : n;
 126 }
 127
 128 static ssize_t
 129 ether_Read(struct physical *p, void *v, size_t n)
 130 {
 131   char hook[sizeof TUN_NAME + 11];
 132
 133   return NgRecvData(p->fd, v, n, hook);
 134 }
 135
 136 static int
 137 ether_RemoveFromSet(struct physical *p, fd_set *r, fd_set *w, fd_set *e)
 138 {
 139   struct etherdevice *dev = device2ether(p->handler);
 140   int result;
 141
 142   if (r && dev->cs >= 0 && FD_ISSET(dev->cs, r)) {
 143     FD_CLR(dev->cs, r);
 144     log_Printf(LogTIMER, "%s: fdunset(ctrl) %d\n", p->link.name, dev->cs);
 145     result = 1;
 146   } else
 147     result = 0;
 148
 149   /* Careful... physical_RemoveFromSet() called us ! */
 150
 151   p->handler->removefromset = NULL;
 152   result += physical_RemoveFromSet(p, r, w, e);
 153   p->handler->removefromset = ether_RemoveFromSet;
 154
 155   return result;
 156 }
 157
 158 static void
 159 ether_Free(struct physical *p)
 160 {
 161   struct etherdevice *dev = device2ether(p->handler);
 162
 163   physical_SetDescriptor(p);
 164   if (dev->cs != -1)
 165     close(dev->cs);
 166   free(dev);
 167 }
 168
 169 static const char *
 170 ether_OpenInfo(struct physical *p)
 171 {
 172   struct etherdevice *dev = device2ether(p->handler);
 173
 174   switch (dev->connected) {
 175     case CARRIER_PENDING:
 176       return "negotiating";
 177     case CARRIER_OK:
 178       return "established";
 179   }
 180
 181   return "disconnected";
 182 }
 183
 184 static int
 185 ether_Slot(struct physical *p)
 186 {
 187   struct etherdevice *dev = device2ether(p->handler);
 188
 189   return dev->slot;
 190 }
 191
 192
 193 static void
 194 ether_device2iov(struct device *d, struct iovec *iov, int *niov,
 195                  int maxiov, int *auxfd, int *nauxfd)
 196 {
 197   struct etherdevice *dev = device2ether(d);
 198   int sz = physical_MaxDeviceSize();
 199
 200   iov[*niov].iov_base = realloc(d, sz);
 201   if (iov[*niov].iov_base == NULL) {
 202     log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz);
 203     AbortProgram(EX_OSERR);
 204   }
 205   iov[*niov].iov_len = sz;
 206   (*niov)++;
 207
 208   if (dev->cs >= 0) {
 209     *auxfd = dev->cs;
 210     (*nauxfd)++;
 211   }
 212 }
 213
 214 static void
 215 ether_MessageIn(struct etherdevice *dev)
 216 {
 217   char msgbuf[sizeof(struct ng_mesg) + sizeof(struct ngpppoe_sts)];
 218   struct ng_mesg *rep = (struct ng_mesg *)msgbuf;
 219   struct ngpppoe_sts *sts = (struct ngpppoe_sts *)(msgbuf + sizeof *rep);
 220   char *end, unknown[14], sessionid[5];
 221   const char *msg;
 222   struct timeval t;
 223   fd_set *r;
 224   u_long slot;
 225   int asciilen, ret;
 226
 227   if (dev->cs < 0)
 228     return;
 229
 230   if ((r = mkfdset()) == NULL) {
 231     log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
 232     return;
 233   }
 234
 235   while (1) {
 236     zerofdset(r);
 237     FD_SET(dev->cs, r);
 238     t.tv_sec = t.tv_usec = 0;
 239     ret = select(dev->cs + 1, r, NULL, NULL, &t);
 240
 241     if (ret <= 0)
 242       break;
 243
 244     if (NgRecvMsg(dev->cs, rep, sizeof msgbuf, NULL) <= 0)
 245       break;
 246
 247     if (rep->header.version != NG_VERSION) {
 248       log_Printf(LogWARN, "%ld: Unexpected netgraph version, expected %ld\n",
 249                  (long)rep->header.version, (long)NG_VERSION);
 250       break;
 251     }
 252
 253     if (rep->header.typecookie != NGM_PPPOE_COOKIE) {
 254       log_Printf(LogWARN, "%ld: Unexpected netgraph cookie, expected %ld\n",
 255                  (long)rep->header.typecookie, (long)NGM_PPPOE_COOKIE);
 256       break;
 257     }
 258
 259     asciilen = 0;
 260     switch (rep->header.cmd) {
 261       case NGM_PPPOE_SET_FLAG:  msg = "SET_FLAG";       break;
 262       case NGM_PPPOE_CONNECT:   msg = "CONNECT";        break;
 263       case NGM_PPPOE_LISTEN:    msg = "LISTEN";         break;
 264       case NGM_PPPOE_OFFER:     msg = "OFFER";          break;
 265       case NGM_PPPOE_SUCCESS:   msg = "SUCCESS";        break;
 266       case NGM_PPPOE_FAIL:      msg = "FAIL";           break;
 267       case NGM_PPPOE_CLOSE:     msg = "CLOSE";          break;
 268       case NGM_PPPOE_GET_STATUS:        msg = "GET_STATUS";     break;
 269       case NGM_PPPOE_ACNAME:
 270         msg = "ACNAME";
 271         if (setenv("ACNAME", sts->hook, 1) != 0)
 272           log_Printf(LogWARN, "setenv: cannot set ACNAME=%s: %m", sts->hook);
 273         asciilen = rep->header.arglen;
 274         break;
 275       case NGM_PPPOE_SESSIONID:
 276         msg = "SESSIONID";
 277         snprintf(sessionid, sizeof sessionid, "%04x", *(u_int16_t *)sts);
 278         if (setenv("SESSIONID", sessionid, 1) != 0)
 279           syslog(LOG_WARNING, "setenv: cannot set SESSIONID=%s: %m",
 280                  sessionid);
 281         /* Use this in preference to our interface index */
 282         slot = strtoul(sessionid, &end, 16);
 283         if (end != sessionid && *end == '\0')
 284             dev->slot = slot;
 285         break;
 286       default:
 287         snprintf(unknown, sizeof unknown, "<%d>", (int)rep->header.cmd);
 288         msg = unknown;
 289         break;
 290     }
 291
 292     if (asciilen)
 293       log_Printf(LogPHASE, "Received NGM_PPPOE_%s (hook \"%.*s\")\n",
 294                  msg, asciilen, sts->hook);
 295     else
 296       log_Printf(LogPHASE, "Received NGM_PPPOE_%s\n", msg);
 297
 298     switch (rep->header.cmd) {
 299       case NGM_PPPOE_SUCCESS:
 300         dev->connected = CARRIER_OK;
 301         break;
 302       case NGM_PPPOE_FAIL:
 303       case NGM_PPPOE_CLOSE:
 304         dev->connected = CARRIER_LOST;
 305         break;
 306     }
 307   }
 308   free(r);
 309 }
 310
 311 static int
 312 ether_AwaitCarrier(struct physical *p)
 313 {
 314   struct etherdevice *dev = device2ether(p->handler);
 315
 316   if (dev->connected != CARRIER_OK && !dev->timeout--)
 317     dev->connected = CARRIER_LOST;
 318   else if (dev->connected == CARRIER_PENDING)
 319     ether_MessageIn(dev);
 320
 321   return dev->connected;
 322 }
 323
 324 static const struct device baseetherdevice = {
 325   ETHER_DEVICE,
 326   "ether",
 327   1492,
 328   { CD_REQUIRED, DEF_ETHERCDDELAY },
 329   ether_AwaitCarrier,
 330   ether_RemoveFromSet,
 331   NULL,
 332   NULL,
 333   NULL,
 334   NULL,
 335   NULL,
 336   ether_Free,
 337   ether_Read,
 338   ether_Write,
 339   ether_device2iov,
 340   NULL,
 341   ether_OpenInfo,
 342   ether_Slot
 343 };
 344
 345 struct device *
 346 ether_iov2device(int type, struct physical *p, struct iovec *iov, int *niov,
 347                  int maxiov, int *auxfd, int *nauxfd)
 348 {
 349   if (type == ETHER_DEVICE) {
 350     struct etherdevice *dev = (struct etherdevice *)iov[(*niov)++].iov_base;
 351
 352     dev = realloc(dev, sizeof *dev);    /* Reduce to the correct size */
 353     if (dev == NULL) {
 354       log_Printf(LogALERT, "Failed to allocate memory: %d\n",
 355                  (int)(sizeof *dev));
 356       AbortProgram(EX_OSERR);
 357     }
 358
 359     if (*nauxfd) {
 360       dev->cs = *auxfd;
 361       (*nauxfd)--;
 362     } else
 363       dev->cs = -1;
 364
 365     /* Refresh function pointers etc */
 366     memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
 367
 368     physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
 369     return &dev->dev;
 370   }
 371
 372   return NULL;
 373 }
 374
 375 static int
 376 ether_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
 377 {
 378   struct physical *p = descriptor2physical(d);
 379   struct etherdevice *dev = device2ether(p->handler);
 380   int result;
 381
 382   if (r && dev->cs >= 0) {
 383     FD_SET(dev->cs, r);
 384     log_Printf(LogTIMER, "%s(ctrl): fdset(r) %d\n", p->link.name, dev->cs);
 385     result = 1;
 386   } else
 387     result = 0;
 388
 389   result += physical_doUpdateSet(d, r, w, e, n, 0);
 390
 391   return result;
 392 }
 393
 394 static int
 395 ether_IsSet(struct fdescriptor *d, const fd_set *fdset)
 396 {
 397   struct physical *p = descriptor2physical(d);
 398   struct etherdevice *dev = device2ether(p->handler);
 399   int result;
 400
 401   result = dev->cs >= 0 && FD_ISSET(dev->cs, fdset);
 402   result += physical_IsSet(d, fdset);
 403
 404   return result;
 405 }
 406
 407 static void
 408 ether_DescriptorRead(struct fdescriptor *d, struct bundle *bundle,
 409                      const fd_set *fdset)
 410 {
 411   struct physical *p = descriptor2physical(d);
 412   struct etherdevice *dev = device2ether(p->handler);
 413
 414   if (dev->cs >= 0 && FD_ISSET(dev->cs, fdset)) {
 415     ether_MessageIn(dev);
 416     if (dev->connected == CARRIER_LOST) {
 417       log_Printf(LogPHASE, "%s: Device disconnected\n", p->link.name);
 418       datalink_Down(p->dl, CLOSE_NORMAL);
 419       return;
 420     }
 421   }
 422
 423   if (physical_IsSet(d, fdset))
 424     physical_DescriptorRead(d, bundle, fdset);
 425 }
 426
 427 static struct device *
 428 ether_Abandon(struct etherdevice *dev, struct physical *p)
 429 {
 430   /* Abandon our node construction */
 431   close(dev->cs);
 432   close(p->fd);
 433   p->fd = -2;   /* Nobody else need try.. */
 434   free(dev);
 435
 436   return NULL;
 437 }
 438
 439 struct device *
 440 ether_Create(struct physical *p)
 441 {
 442   u_char rbuf[2048];
 443   struct etherdevice *dev;
 444   struct ng_mesg *resp;
 445   const struct hooklist *hlist;
 446   const struct nodeinfo *ninfo;
 447   char *path, *sessionid;
 448   int ifacelen, f;
 449
 450   dev = NULL;
 451   path = NULL;
 452   ifacelen = 0;
 453   if (p->fd < 0 && !strncasecmp(p->name.full, NG_PPPOE_NODE_TYPE,
 454                                 PPPOE_NODE_TYPE_LEN) &&
 455       p->name.full[PPPOE_NODE_TYPE_LEN] == ':') {
 456     const struct linkinfo *nlink;
 457     struct ngpppoe_init_data *data;
 458     struct ngm_mkpeer mkp;
 459     struct ngm_connect ngc;
 460     const char *iface, *provider;
 461     char etherid[12];
 462     int providerlen;
 463     char connectpath[sizeof dev->hook + 2];     /* .:<hook> */
 464
 465     p->fd--;                            /* We own the device - change fd */
 466
 467     loadmodules(LOAD_VERBOSLY, "netgraph", "ng_ether", "ng_pppoe", "ng_socket",
 468                 NULL);
 469
 470     if ((dev = malloc(sizeof *dev)) == NULL)
 471       return NULL;
 472
 473     iface = p->name.full + PPPOE_NODE_TYPE_LEN + 1;
 474
 475     provider = strchr(iface, ':');
 476     if (provider) {
 477       ifacelen = provider - iface;
 478       provider++;
 479       providerlen = strlen(provider);
 480     } else {
 481       ifacelen = strlen(iface);
 482       provider = "";
 483       providerlen = 0;
 484     }
 485
 486     /*
 487      * We're going to do this (where tunN is our tunnel device):
 488      *
 489      * .---------.
 490      * |  ether  |
 491      * | <iface> |                         dev->cs
 492      * `---------'                           |
 493      *  (orphan)                     p->fd   |
 494      *     |                           |     |
 495      *     |                           |     |
 496      * (ethernet)                      |     |
 497      * .---------.                  .-----------.
 498      * |  pppoe  |                  |  socket   |
 499      * | <iface> |(tunN)<---->(tunN)| <unnamed> |
 500      * `---------                   `-----------'
 501      *   (tunX)
 502      *     ^
 503      *     |
 504      *     `--->(tunX)
 505      */
 506
 507     /* Create a socket node */
 508     if (ID0NgMkSockNode(NULL, &dev->cs, &p->fd) == -1) {
 509       log_Printf(LogWARN, "Cannot create netgraph socket node: %s\n",
 510                  strerror(errno));
 511       free(dev);
 512       p->fd = -2;
 513       return NULL;
 514     }
 515
 516     /*
 517      * Ask for a list of hooks attached to the "ether" node.  This node should
 518      * magically exist as a way of hooking stuff onto an ethernet device
 519      */
 520     path = (char *)alloca(ifacelen + 2);
 521     sprintf(path, "%.*s:", ifacelen, iface);
 522     if (NgSendMsg(dev->cs, path, NGM_GENERIC_COOKIE, NGM_LISTHOOKS,
 523                   NULL, 0) < 0) {
 524       log_Printf(LogWARN, "%s Cannot send a netgraph message: %s\n",
 525                  path, strerror(errno));
 526       return ether_Abandon(dev, p);
 527     }
 528
 529     /* Get our list back */
 530     resp = (struct ng_mesg *)rbuf;
 531     if (NgRecvMsg(dev->cs, resp, sizeof rbuf, NULL) <= 0) {
 532       log_Printf(LogWARN, "Cannot get netgraph response: %s\n",
 533                  strerror(errno));
 534       return ether_Abandon(dev, p);
 535     }
 536
 537     hlist = (const struct hooklist *)resp->data;
 538     ninfo = &hlist->nodeinfo;
 539
 540     /* Make sure we've got the right type of node */
 541     if (strncmp(ninfo->type, NG_ETHER_NODE_TYPE,
 542                 sizeof NG_ETHER_NODE_TYPE - 1)) {
 543       log_Printf(LogWARN, "%s Unexpected node type ``%s'' (wanted ``"
 544                  NG_ETHER_NODE_TYPE "'')\n", path, ninfo->type);
 545       return ether_Abandon(dev, p);
 546     }
 547
 548     log_Printf(LogDEBUG, "List of netgraph node ``%s'' (id %x) hooks:\n",
 549                path, ninfo->id);
 550
 551     /* look for a hook already attached.  */
 552     for (f = 0; f < ninfo->hooks; f++) {
 553       nlink = &hlist->link[f];
 554
 555       log_Printf(LogDEBUG, "  Found %s -> %s\n", nlink->ourhook,
 556                  nlink->peerhook);
 557
 558       if (!strcmp(nlink->ourhook, NG_ETHER_HOOK_ORPHAN) ||
 559           !strcmp(nlink->ourhook, NG_ETHER_HOOK_DIVERT)) {
 560         /*
 561          * Something is using the data coming out of this ``ether'' node.
 562          * If it's a PPPoE node, we use that node, otherwise we complain that
 563          * someone else is using the node.
 564          */
 565         if (!strcmp(nlink->nodeinfo.type, NG_PPPOE_NODE_TYPE))
 566           /* Use this PPPoE node ! */
 567           snprintf(ngc.path, sizeof ngc.path, "[%x]:", nlink->nodeinfo.id);
 568         else {
 569           log_Printf(LogWARN, "%s Node type ``%s'' is currently active\n",
 570                      path, nlink->nodeinfo.type);
 571           return ether_Abandon(dev, p);
 572         }
 573         break;
 574       }
 575     }
 576
 577     if (f == ninfo->hooks) {
 578       /*
 579        * Create a new ``PPPoE'' node connected to the ``ether'' node using
 580        * the ``orphan'' and ``ethernet'' hooks
 581        */
 582       snprintf(mkp.type, sizeof mkp.type, "%s", NG_PPPOE_NODE_TYPE);
 583       snprintf(mkp.ourhook, sizeof mkp.ourhook, "%s", NG_ETHER_HOOK_ORPHAN);
 584       snprintf(mkp.peerhook, sizeof mkp.peerhook, "%s", NG_PPPOE_HOOK_ETHERNET);
 585       snprintf(etherid, sizeof etherid, "[%x]:", ninfo->id);
 586
 587       log_Printf(LogDEBUG, "Creating PPPoE netgraph node %s%s -> %s\n",
 588                  etherid, mkp.ourhook, mkp.peerhook);
 589
 590       if (NgSendMsg(dev->cs, etherid, NGM_GENERIC_COOKIE,
 591                     NGM_MKPEER, &mkp, sizeof mkp) < 0) {
 592         log_Printf(LogWARN, "%s Cannot create PPPoE netgraph node: %s\n",
 593                    etherid, strerror(errno));
 594         return ether_Abandon(dev, p);
 595       }
 596
 597       snprintf(ngc.path, sizeof ngc.path, "%s%s", path, NG_ETHER_HOOK_ORPHAN);
 598     }
 599
 600     snprintf(dev->hook, sizeof dev->hook, "%s%d",
 601              TUN_NAME, p->dl->bundle->unit);
 602
 603     /*
 604      * Connect the PPPoE node to our socket node.
 605      * ngc.path has already been set up
 606      */
 607     snprintf(ngc.ourhook, sizeof ngc.ourhook, "%s", dev->hook);
 608     memcpy(ngc.peerhook, ngc.ourhook, sizeof ngc.peerhook);
 609
 610     log_Printf(LogDEBUG, "Connecting netgraph socket .:%s -> %s:%s\n",
 611                ngc.ourhook, ngc.path, ngc.peerhook);
 612     if (NgSendMsg(dev->cs, ".:", NGM_GENERIC_COOKIE,
 613                   NGM_CONNECT, &ngc, sizeof ngc) < 0) {
 614       log_Printf(LogWARN, "Cannot connect PPPoE and socket netgraph "
 615                  "nodes: %s\n", strerror(errno));
 616       return ether_Abandon(dev, p);
 617     }
 618
 619     /* Bring the Ethernet interface up */
 620     path[ifacelen] = '\0';      /* Remove the trailing ':' */
 621     if (!iface_SetFlags(path, IFF_UP))
 622       log_Printf(LogWARN, "%s: Failed to set the IFF_UP flag on %s\n",
 623                  p->link.name, path);
 624
 625     /* And finally, request a connection to the given provider */
 626
 627     data = (struct ngpppoe_init_data *)alloca(sizeof *data + providerlen);
 628     snprintf(data->hook, sizeof data->hook, "%s", dev->hook);
 629     memcpy(data->data, provider, providerlen);
 630     data->data_len = providerlen;
 631
 632     snprintf(connectpath, sizeof connectpath, ".:%s", dev->hook);
 633     log_Printf(LogDEBUG, "Sending PPPOE_CONNECT to %s\n", connectpath);
 634     if (NgSendMsg(dev->cs, connectpath, NGM_PPPOE_COOKIE,
 635                   NGM_PPPOE_CONNECT, data, sizeof *data + providerlen) == -1) {
 636       log_Printf(LogWARN, "``%s'': Cannot start netgraph node: %s\n",
 637                  connectpath, strerror(errno));
 638       return ether_Abandon(dev, p);
 639     }
 640
 641     /* Hook things up so that we monitor dev->cs */
 642     p->desc.UpdateSet = ether_UpdateSet;
 643     p->desc.IsSet = ether_IsSet;
 644     p->desc.Read = ether_DescriptorRead;
 645
 646     memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
 647     switch (p->cfg.cd.necessity) {
 648       case CD_VARIABLE:
 649         dev->dev.cd.delay = p->cfg.cd.delay;
 650         break;
 651       case CD_REQUIRED:
 652         dev->dev.cd = p->cfg.cd;
 653         break;
 654       case CD_NOTREQUIRED:
 655         log_Printf(LogWARN, "%s: Carrier must be set, using ``set cd %d!''\n",
 656                    p->link.name, dev->dev.cd.delay);
 657       case CD_DEFAULT:
 658         break;
 659     }
 660
 661     dev->timeout = dev->dev.cd.delay;
 662     dev->connected = CARRIER_PENDING;
 663     /* This will be overridden by our session id - if provided by netgraph */
 664     dev->slot = GetIfIndex(path);
 665   } else {
 666     /* See if we're a netgraph socket */
 667     struct stat st;
 668
 669     if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFSOCK)) {
 670       struct sockaddr_storage ssock;
 671       struct sockaddr *sock = (struct sockaddr *)&ssock;
 672       int sz;
 673
 674       sz = sizeof ssock;
 675       if (getsockname(p->fd, sock, &sz) == -1) {
 676         log_Printf(LogPHASE, "%s: Link is a closed socket !\n", p->link.name);
 677         close(p->fd);
 678         p->fd = -1;
 679         return NULL;
 680       }
 681
 682       if (sock->sa_family == AF_NETGRAPH) {
 683         /*
 684          * It's a netgraph node... We can't determine hook names etc, so we
 685          * stay pretty impartial....
 686          */
 687         log_Printf(LogPHASE, "%s: Link is a netgraph node\n", p->link.name);
 688
 689         if ((dev = malloc(sizeof *dev)) == NULL) {
 690           log_Printf(LogWARN, "%s: Cannot allocate an ether device: %s\n",
 691                      p->link.name, strerror(errno));
 692           return NULL;
 693         }
 694
 695         memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
 696         dev->cs = -1;
 697         dev->timeout = 0;
 698         dev->connected = CARRIER_OK;
 699         *dev->hook = '\0';
 700
 701         /*
 702          * If we're being envoked from pppoed(8), we may have a SESSIONID
 703          * set in the environment.  If so, use it as the slot
 704          */
 705         if ((sessionid = getenv("SESSIONID")) != NULL) {
 706           char *end;
 707           u_long slot;
 708
 709           slot = strtoul(sessionid, &end, 16);
 710           dev->slot = end != sessionid && *end == '\0' ? slot : 0;
 711         } else
 712           dev->slot = 0;
 713       }
 714     }
 715   }
 716
 717   if (dev) {
 718     physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
 719     return &dev->dev;
 720   }
 721
 722   return NULL;
 723 }