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 #ifdef WANT_NETGRAPH7
  43 #include <netgraph7/ether/ng_ether.h>
  44 #include <netgraph7/ng_message.h>
  45 #include <netgraph7/pppoe/ng_pppoe.h>
  46 #include <netgraph7/socket/ng_socket.h>
  47 #else
  48 #include <netgraph/ether/ng_ether.h>
  49 #include <netgraph/ng_message.h>
  50 #include <netgraph/pppoe/ng_pppoe.h>
  51 #include <netgraph/socket/ng_socket.h>
  52 #endif
  53
  54 #include <errno.h>
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <sysexits.h>
  59 #include <sys/fcntl.h>
  60 #include <sys/stat.h>
  61 #include <sys/uio.h>
  62 #include <termios.h>
  63 #include <sys/time.h>
  64 #include <syslog.h>
  65 #include <unistd.h>
  66
  67 #include "layer.h"
  68 #include "defs.h"
  69 #include "mbuf.h"
  70 #include "log.h"
  71 #include "timer.h"
  72 #include "lqr.h"
  73 #include "hdlc.h"
  74 #include "throughput.h"
  75 #include "fsm.h"
  76 #include "lcp.h"
  77 #include "ccp.h"
  78 #include "link.h"
  79 #include "async.h"
  80 #include "descriptor.h"
  81 #include "physical.h"
  82 #include "main.h"
  83 #include "mp.h"
  84 #include "chat.h"
  85 #include "auth.h"
  86 #include "chap.h"
  87 #include "cbcp.h"
  88 #include "datalink.h"
  89 #include "slcompress.h"
  90 #include "iplist.h"
  91 #include "ncpaddr.h"
  92 #include "ip.h"
  93 #include "ipcp.h"
  94 #include "filter.h"
  95 #ifndef NORADIUS
  96 #include "radius.h"
  97 #endif
  98 #include "ipv6cp.h"
  99 #include "ncp.h"
 100 #include "bundle.h"
 101 #include "id.h"
 102 #include "iface.h"
 103 #include "route.h"
 104 #include "ether.h"
 105
 106
 107 #define PPPOE_NODE_TYPE_LEN (sizeof NG_PPPOE_NODE_TYPE - 1) /* "PPPoE" */
 108
 109 struct etherdevice {
 110   struct device dev;                    /* What struct physical knows about */
 111   int cs;                               /* Control socket */
 112   int connected;                        /* Are we connected yet ? */
 113   int timeout;                          /* Seconds attempting to connect */
 114   char hook[sizeof TUN_NAME + 11];      /* Our socket node hook */
 115   u_int32_t slot;                       /* ifindex << 24 | unit */
 116 };
 117
 118 #define device2ether(d) \
 119   ((d)->type == ETHER_DEVICE ? (struct etherdevice *)d : NULL)
 120
 121 unsigned
 122 ether_DeviceSize(void)
 123 {
 124   return sizeof(struct etherdevice);
 125 }
 126
 127 static ssize_t
 128 ether_Write(struct physical *p, const void *v, size_t n)
 129 {
 130   struct etherdevice *dev = device2ether(p->handler);
 131
 132   return NgSendData(p->fd, dev->hook, v, n) == -1 ? -1 : (ssize_t)n;
 133 }
 134
 135 static ssize_t
 136 ether_Read(struct physical *p, void *v, size_t n)
 137 {
 138   char hook[sizeof TUN_NAME + 11];
 139
 140   return NgRecvData(p->fd, v, n, hook);
 141 }
 142
 143 static int
 144 ether_RemoveFromSet(struct physical *p, fd_set *r, fd_set *w, fd_set *e)
 145 {
 146   struct etherdevice *dev = device2ether(p->handler);
 147   int result;
 148
 149   if (r && dev->cs >= 0 && FD_ISSET(dev->cs, r)) {
 150     FD_CLR(dev->cs, r);
 151     log_Printf(LogTIMER, "%s: fdunset(ctrl) %d\n", p->link.name, dev->cs);
 152     result = 1;
 153   } else
 154     result = 0;
 155
 156   /* Careful... physical_RemoveFromSet() called us ! */
 157
 158   p->handler->removefromset = NULL;
 159   result += physical_RemoveFromSet(p, r, w, e);
 160   p->handler->removefromset = ether_RemoveFromSet;
 161
 162   return result;
 163 }
 164
 165 static void
 166 ether_Free(struct physical *p)
 167 {
 168   struct etherdevice *dev = device2ether(p->handler);
 169
 170   physical_SetDescriptor(p);
 171   if (dev->cs != -1)
 172     close(dev->cs);
 173   free(dev);
 174 }
 175
 176 static const char *
 177 ether_OpenInfo(struct physical *p)
 178 {
 179   struct etherdevice *dev = device2ether(p->handler);
 180
 181   switch (dev->connected) {
 182     case CARRIER_PENDING:
 183       return "negotiating";
 184     case CARRIER_OK:
 185       return "established";
 186   }
 187
 188   return "disconnected";
 189 }
 190
 191 static int
 192 ether_Slot(struct physical *p)
 193 {
 194   struct etherdevice *dev = device2ether(p->handler);
 195
 196   return dev->slot;
 197 }
 198
 199
 200 static void
 201 ether_device2iov(struct device *d, struct iovec *iov, int *niov,
 202                  int maxiov __unused, int *auxfd, int *nauxfd)
 203 {
 204   struct etherdevice *dev = device2ether(d);
 205   int sz = physical_MaxDeviceSize();
 206
 207   iov[*niov].iov_base = realloc(d, sz);
 208   if (iov[*niov].iov_base == NULL) {
 209     log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz);
 210     AbortProgram(EX_OSERR);
 211   }
 212   iov[*niov].iov_len = sz;
 213   (*niov)++;
 214
 215   if (dev->cs >= 0) {
 216     *auxfd = dev->cs;
 217     (*nauxfd)++;
 218   }
 219 }
 220
 221 static void
 222 ether_MessageIn(struct etherdevice *dev)
 223 {
 224   char msgbuf[sizeof(struct ng_mesg) + sizeof(struct ngpppoe_sts)];
 225   struct ng_mesg *rep = (struct ng_mesg *)msgbuf;
 226   struct ngpppoe_sts *sts = (struct ngpppoe_sts *)(msgbuf + sizeof *rep);
 227   char *end, unknown[14], sessionid[5];
 228   const char *msg;
 229   struct timeval t;
 230   fd_set *r;
 231   u_long slot;
 232   int asciilen, ret;
 233
 234   if (dev->cs < 0)
 235     return;
 236
 237   if ((r = mkfdset()) == NULL) {
 238     log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
 239     return;
 240   }
 241
 242   while (1) {
 243     zerofdset(r);
 244     FD_SET(dev->cs, r);
 245     t.tv_sec = t.tv_usec = 0;
 246     ret = select(dev->cs + 1, r, NULL, NULL, &t);
 247
 248     if (ret <= 0)
 249       break;
 250
 251     if (NgRecvMsg(dev->cs, rep, sizeof msgbuf, NULL) <= 0)
 252       break;
 253
 254     if (rep->header.version != NG_VERSION) {
 255       log_Printf(LogWARN, "%ld: Unexpected netgraph version, expected %ld\n",
 256                  (long)rep->header.version, (long)NG_VERSION);
 257       break;
 258     }
 259
 260     if (rep->header.typecookie != NGM_PPPOE_COOKIE) {
 261       log_Printf(LogWARN, "%ld: Unexpected netgraph cookie, expected %ld\n",
 262                  (long)rep->header.typecookie, (long)NGM_PPPOE_COOKIE);
 263       break;
 264     }
 265
 266     asciilen = 0;
 267     switch (rep->header.cmd) {
 268       case NGM_PPPOE_SET_FLAG:  msg = "SET_FLAG";       break;
 269       case NGM_PPPOE_CONNECT:   msg = "CONNECT";        break;
 270       case NGM_PPPOE_LISTEN:    msg = "LISTEN";         break;
 271       case NGM_PPPOE_OFFER:     msg = "OFFER";          break;
 272       case NGM_PPPOE_SUCCESS:   msg = "SUCCESS";        break;
 273       case NGM_PPPOE_FAIL:      msg = "FAIL";           break;
 274       case NGM_PPPOE_CLOSE:     msg = "CLOSE";          break;
 275       case NGM_PPPOE_GET_STATUS:        msg = "GET_STATUS";     break;
 276       case NGM_PPPOE_ACNAME:
 277         msg = "ACNAME";
 278         if (setenv("ACNAME", sts->hook, 1) != 0)
 279           log_Printf(LogWARN, "setenv: cannot set ACNAME=%s: %m", sts->hook);
 280         asciilen = rep->header.arglen;
 281         break;
 282       case NGM_PPPOE_SESSIONID:
 283         msg = "SESSIONID";
 284         snprintf(sessionid, sizeof sessionid, "%04x", *(u_int16_t *)sts);
 285         if (setenv("SESSIONID", sessionid, 1) != 0)
 286           syslog(LOG_WARNING, "setenv: cannot set SESSIONID=%s: %m",
 287                  sessionid);
 288         /* Use this in preference to our interface index */
 289         slot = strtoul(sessionid, &end, 16);
 290         if (end != sessionid && *end == '\0')
 291             dev->slot = slot;
 292         break;
 293       default:
 294         snprintf(unknown, sizeof unknown, "<%d>", (int)rep->header.cmd);
 295         msg = unknown;
 296         break;
 297     }
 298
 299     if (asciilen)
 300       log_Printf(LogPHASE, "Received NGM_PPPOE_%s (hook \"%.*s\")\n",
 301                  msg, asciilen, sts->hook);
 302     else
 303       log_Printf(LogPHASE, "Received NGM_PPPOE_%s\n", msg);
 304
 305     switch (rep->header.cmd) {
 306       case NGM_PPPOE_SUCCESS:
 307         dev->connected = CARRIER_OK;
 308         break;
 309       case NGM_PPPOE_FAIL:
 310       case NGM_PPPOE_CLOSE:
 311         dev->connected = CARRIER_LOST;
 312         break;
 313     }
 314   }
 315   free(r);
 316 }
 317
 318 static int
 319 ether_AwaitCarrier(struct physical *p)
 320 {
 321   struct etherdevice *dev = device2ether(p->handler);
 322
 323   if (dev->connected != CARRIER_OK && !dev->timeout--)
 324     dev->connected = CARRIER_LOST;
 325   else if (dev->connected == CARRIER_PENDING)
 326     ether_MessageIn(dev);
 327
 328   return dev->connected;
 329 }
 330
 331 static const struct device baseetherdevice = {
 332   ETHER_DEVICE,
 333   "ether",
 334   1492,
 335   { CD_REQUIRED, DEF_ETHERCDDELAY },
 336   ether_AwaitCarrier,
 337   ether_RemoveFromSet,
 338   NULL,
 339   NULL,
 340   NULL,
 341   NULL,
 342   NULL,
 343   ether_Free,
 344   ether_Read,
 345   ether_Write,
 346   ether_device2iov,
 347   NULL,
 348   ether_OpenInfo,
 349   ether_Slot
 350 };
 351
 352 struct device *
 353 ether_iov2device(int type, struct physical *p, struct iovec *iov, int *niov,
 354                  int maxiov __unused, int *auxfd, int *nauxfd)
 355 {
 356   if (type == ETHER_DEVICE) {
 357     struct etherdevice *dev = (struct etherdevice *)iov[(*niov)++].iov_base;
 358
 359     dev = realloc(dev, sizeof *dev);    /* Reduce to the correct size */
 360     if (dev == NULL) {
 361       log_Printf(LogALERT, "Failed to allocate memory: %d\n",
 362                  (int)(sizeof *dev));
 363       AbortProgram(EX_OSERR);
 364     }
 365
 366     if (*nauxfd) {
 367       dev->cs = *auxfd;
 368       (*nauxfd)--;
 369     } else
 370       dev->cs = -1;
 371
 372     /* Refresh function pointers etc */
 373     memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
 374
 375     physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
 376     return &dev->dev;
 377   }
 378
 379   return NULL;
 380 }
 381
 382 static int
 383 ether_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
 384 {
 385   struct physical *p = descriptor2physical(d);
 386   struct etherdevice *dev = device2ether(p->handler);
 387   int result;
 388
 389   if (r && dev->cs >= 0) {
 390     FD_SET(dev->cs, r);
 391     log_Printf(LogTIMER, "%s(ctrl): fdset(r) %d\n", p->link.name, dev->cs);
 392     result = 1;
 393   } else
 394     result = 0;
 395
 396   result += physical_doUpdateSet(d, r, w, e, n, 0);
 397
 398   return result;
 399 }
 400
 401 static int
 402 ether_IsSet(struct fdescriptor *d, const fd_set *fdset)
 403 {
 404   struct physical *p = descriptor2physical(d);
 405   struct etherdevice *dev = device2ether(p->handler);
 406   int result;
 407
 408   result = dev->cs >= 0 && FD_ISSET(dev->cs, fdset);
 409   result += physical_IsSet(d, fdset);
 410
 411   return result;
 412 }
 413
 414 static void
 415 ether_DescriptorRead(struct fdescriptor *d, struct bundle *bundle,
 416                      const fd_set *fdset)
 417 {
 418   struct physical *p = descriptor2physical(d);
 419   struct etherdevice *dev = device2ether(p->handler);
 420
 421   if (dev->cs >= 0 && FD_ISSET(dev->cs, fdset)) {
 422     ether_MessageIn(dev);
 423     if (dev->connected == CARRIER_LOST) {
 424       log_Printf(LogPHASE, "%s: Device disconnected\n", p->link.name);
 425       datalink_Down(p->dl, CLOSE_NORMAL);
 426       return;
 427     }
 428   }
 429
 430   if (physical_IsSet(d, fdset))
 431     physical_DescriptorRead(d, bundle, fdset);
 432 }
 433
 434 static struct device *
 435 ether_Abandon(struct etherdevice *dev, struct physical *p)
 436 {
 437   /* Abandon our node construction */
 438   close(dev->cs);
 439   close(p->fd);
 440   p->fd = -2;   /* Nobody else need try.. */
 441   free(dev);
 442
 443   return NULL;
 444 }
 445
 446 struct device *
 447 ether_Create(struct physical *p)
 448 {
 449   u_char rbuf[2048];
 450   struct etherdevice *dev;
 451   struct ng_mesg *resp;
 452   const struct hooklist *hlist;
 453   const struct nodeinfo *ninfo;
 454   char *path, *sessionid;
 455   size_t ifacelen;
 456   unsigned f;
 457
 458   dev = NULL;
 459   path = NULL;
 460   ifacelen = 0;
 461   if (p->fd < 0 && !strncasecmp(p->name.full, NG_PPPOE_NODE_TYPE,
 462                                 PPPOE_NODE_TYPE_LEN) &&
 463       p->name.full[PPPOE_NODE_TYPE_LEN] == ':') {
 464     const struct linkinfo *nlink;
 465     struct ngpppoe_init_data *data;
 466     struct ngm_mkpeer mkp;
 467     struct ngm_connect ngc;
 468     const char *iface, *provider;
 469     char etherid[12];
 470     int providerlen;
 471     char connectpath[sizeof dev->hook + 2];     /* .:<hook> */
 472
 473     p->fd--;                            /* We own the device - change fd */
 474
 475     loadmodules(LOAD_VERBOSLY, "netgraph", "ng_ether", "ng_pppoe", "ng_socket",
 476                 NULL);
 477
 478     if ((dev = malloc(sizeof *dev)) == NULL)
 479       return NULL;
 480
 481     iface = p->name.full + PPPOE_NODE_TYPE_LEN + 1;
 482
 483     provider = strchr(iface, ':');
 484     if (provider) {
 485       ifacelen = provider - iface;
 486       provider++;
 487       providerlen = strlen(provider);
 488     } else {
 489       ifacelen = strlen(iface);
 490       provider = "";
 491       providerlen = 0;
 492     }
 493
 494     /*
 495      * We're going to do this (where tunN is our tunnel device):
 496      *
 497      * .---------.
 498      * |  ether  |
 499      * | <iface> |                         dev->cs
 500      * `---------'                           |
 501      *  (orphan)                     p->fd   |
 502      *     |                           |     |
 503      *     |                           |     |
 504      * (ethernet)                      |     |
 505      * .---------.                  .-----------.
 506      * |  pppoe  |                  |  socket   |
 507      * | <iface> |(tunN)<---->(tunN)| <unnamed> |
 508      * `---------                   `-----------'
 509      *   (tunX)
 510      *     ^
 511      *     |
 512      *     `--->(tunX)
 513      */
 514
 515     /* Create a socket node */
 516     if (ID0NgMkSockNode(NULL, &dev->cs, &p->fd) == -1) {
 517       log_Printf(LogWARN, "Cannot create netgraph socket node: %s\n",
 518                  strerror(errno));
 519       free(dev);
 520       p->fd = -2;
 521       return NULL;
 522     }
 523
 524     /*
 525      * Ask for a list of hooks attached to the "ether" node.  This node should
 526      * magically exist as a way of hooking stuff onto an ethernet device
 527      */
 528     path = (char *)alloca(ifacelen + 2);
 529     sprintf(path, "%.*s:", (int)ifacelen, iface);
 530     if (NgSendMsg(dev->cs, path, NGM_GENERIC_COOKIE, NGM_LISTHOOKS,
 531                   NULL, 0) < 0) {
 532       log_Printf(LogWARN, "%s Cannot send a netgraph message: %s\n",
 533                  path, strerror(errno));
 534       return ether_Abandon(dev, p);
 535     }
 536
 537     /* Get our list back */
 538     resp = (struct ng_mesg *)rbuf;
 539     if (NgRecvMsg(dev->cs, resp, sizeof rbuf, NULL) <= 0) {
 540       log_Printf(LogWARN, "Cannot get netgraph response: %s\n",
 541                  strerror(errno));
 542       return ether_Abandon(dev, p);
 543     }
 544
 545     hlist = (const struct hooklist *)resp->data;
 546     ninfo = &hlist->nodeinfo;
 547
 548     /* Make sure we've got the right type of node */
 549     if (strncmp(ninfo->type, NG_ETHER_NODE_TYPE,
 550                 sizeof NG_ETHER_NODE_TYPE - 1)) {
 551       log_Printf(LogWARN, "%s Unexpected node type ``%s'' (wanted ``"
 552                  NG_ETHER_NODE_TYPE "'')\n", path, ninfo->type);
 553       return ether_Abandon(dev, p);
 554     }
 555
 556     log_Printf(LogDEBUG, "List of netgraph node ``%s'' (id %x) hooks:\n",
 557                path, ninfo->id);
 558
 559     /* look for a hook already attached.  */
 560     for (f = 0; f < ninfo->hooks; f++) {
 561       nlink = &hlist->link[f];
 562
 563       log_Printf(LogDEBUG, "  Found %s -> %s\n", nlink->ourhook,
 564                  nlink->peerhook);
 565
 566       if (!strcmp(nlink->ourhook, NG_ETHER_HOOK_ORPHAN) ||
 567           !strcmp(nlink->ourhook, NG_ETHER_HOOK_DIVERT)) {
 568         /*
 569          * Something is using the data coming out of this ``ether'' node.
 570          * If it's a PPPoE node, we use that node, otherwise we complain that
 571          * someone else is using the node.
 572          */
 573         if (!strcmp(nlink->nodeinfo.type, NG_PPPOE_NODE_TYPE))
 574           /* Use this PPPoE node ! */
 575           snprintf(ngc.path, sizeof ngc.path, "[%x]:", nlink->nodeinfo.id);
 576         else {
 577           log_Printf(LogWARN, "%s Node type ``%s'' is currently active\n",
 578                      path, nlink->nodeinfo.type);
 579           return ether_Abandon(dev, p);
 580         }
 581         break;
 582       }
 583     }
 584
 585     if (f == ninfo->hooks) {
 586       /*
 587        * Create a new ``PPPoE'' node connected to the ``ether'' node using
 588        * the ``orphan'' and ``ethernet'' hooks
 589        */
 590       snprintf(mkp.type, sizeof mkp.type, "%s", NG_PPPOE_NODE_TYPE);
 591       snprintf(mkp.ourhook, sizeof mkp.ourhook, "%s", NG_ETHER_HOOK_ORPHAN);
 592       snprintf(mkp.peerhook, sizeof mkp.peerhook, "%s", NG_PPPOE_HOOK_ETHERNET);
 593       snprintf(etherid, sizeof etherid, "[%x]:", ninfo->id);
 594
 595       log_Printf(LogDEBUG, "Creating PPPoE netgraph node %s%s -> %s\n",
 596                  etherid, mkp.ourhook, mkp.peerhook);
 597
 598       if (NgSendMsg(dev->cs, etherid, NGM_GENERIC_COOKIE,
 599                     NGM_MKPEER, &mkp, sizeof mkp) < 0) {
 600         log_Printf(LogWARN, "%s Cannot create PPPoE netgraph node: %s\n",
 601                    etherid, strerror(errno));
 602         return ether_Abandon(dev, p);
 603       }
 604
 605       snprintf(ngc.path, sizeof ngc.path, "%s%s", path, NG_ETHER_HOOK_ORPHAN);
 606     }
 607
 608     snprintf(dev->hook, sizeof dev->hook, "%s%d",
 609              TUN_NAME, p->dl->bundle->unit);
 610
 611     /*
 612      * Connect the PPPoE node to our socket node.
 613      * ngc.path has already been set up
 614      */
 615     snprintf(ngc.ourhook, sizeof ngc.ourhook, "%s", dev->hook);
 616     memcpy(ngc.peerhook, ngc.ourhook, sizeof ngc.peerhook);
 617
 618     log_Printf(LogDEBUG, "Connecting netgraph socket .:%s -> %s:%s\n",
 619                ngc.ourhook, ngc.path, ngc.peerhook);
 620     if (NgSendMsg(dev->cs, ".:", NGM_GENERIC_COOKIE,
 621                   NGM_CONNECT, &ngc, sizeof ngc) < 0) {
 622       log_Printf(LogWARN, "Cannot connect PPPoE and socket netgraph "
 623                  "nodes: %s\n", strerror(errno));
 624       return ether_Abandon(dev, p);
 625     }
 626
 627     /* Bring the Ethernet interface up */
 628     path[ifacelen] = '\0';      /* Remove the trailing ':' */
 629     if (!iface_SetFlags(path, IFF_UP))
 630       log_Printf(LogWARN, "%s: Failed to set the IFF_UP flag on %s\n",
 631                  p->link.name, path);
 632
 633     /* And finally, request a connection to the given provider */
 634
 635     data = (struct ngpppoe_init_data *)alloca(sizeof *data + providerlen);
 636     snprintf(data->hook, sizeof data->hook, "%s", dev->hook);
 637     memcpy(data->data, provider, providerlen);
 638     data->data_len = providerlen;
 639
 640     snprintf(connectpath, sizeof connectpath, ".:%s", dev->hook);
 641     log_Printf(LogDEBUG, "Sending PPPOE_CONNECT to %s\n", connectpath);
 642     if (NgSendMsg(dev->cs, connectpath, NGM_PPPOE_COOKIE,
 643                   NGM_PPPOE_CONNECT, data, sizeof *data + providerlen) == -1) {
 644       log_Printf(LogWARN, "``%s'': Cannot start netgraph node: %s\n",
 645                  connectpath, strerror(errno));
 646       return ether_Abandon(dev, p);
 647     }
 648
 649     /* Hook things up so that we monitor dev->cs */
 650     p->desc.UpdateSet = ether_UpdateSet;
 651     p->desc.IsSet = ether_IsSet;
 652     p->desc.Read = ether_DescriptorRead;
 653
 654     memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
 655     switch (p->cfg.cd.necessity) {
 656       case CD_VARIABLE:
 657         dev->dev.cd.delay = p->cfg.cd.delay;
 658         break;
 659       case CD_REQUIRED:
 660         dev->dev.cd = p->cfg.cd;
 661         break;
 662       case CD_NOTREQUIRED:
 663         log_Printf(LogWARN, "%s: Carrier must be set, using ``set cd %d!''\n",
 664                    p->link.name, dev->dev.cd.delay);
 665       case CD_DEFAULT:
 666         break;
 667     }
 668
 669     dev->timeout = dev->dev.cd.delay;
 670     dev->connected = CARRIER_PENDING;
 671     /* This will be overridden by our session id - if provided by netgraph */
 672     dev->slot = GetIfIndex(path);
 673   } else {
 674     /* See if we're a netgraph socket */
 675     struct stat st;
 676
 677     if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFSOCK)) {
 678       struct sockaddr_storage ssock;
 679       struct sockaddr *sock = (struct sockaddr *)&ssock;
 680       int sz;
 681
 682       sz = sizeof ssock;
 683       if (getsockname(p->fd, sock, &sz) == -1) {
 684         log_Printf(LogPHASE, "%s: Link is a closed socket !\n", p->link.name);
 685         close(p->fd);
 686         p->fd = -1;
 687         return NULL;
 688       }
 689
 690       if (sock->sa_family == AF_NETGRAPH) {
 691         /*
 692          * It's a netgraph node... We can't determine hook names etc, so we
 693          * stay pretty impartial....
 694          */
 695         log_Printf(LogPHASE, "%s: Link is a netgraph node\n", p->link.name);
 696
 697         if ((dev = malloc(sizeof *dev)) == NULL) {
 698           log_Printf(LogWARN, "%s: Cannot allocate an ether device: %s\n",
 699                      p->link.name, strerror(errno));
 700           return NULL;
 701         }
 702
 703         memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
 704         dev->cs = -1;
 705         dev->timeout = 0;
 706         dev->connected = CARRIER_OK;
 707         *dev->hook = '\0';
 708
 709         /*
 710          * If we're being envoked from pppoed(8), we may have a SESSIONID
 711          * set in the environment.  If so, use it as the slot
 712          */
 713         if ((sessionid = getenv("SESSIONID")) != NULL) {
 714           char *end;
 715           u_long slot;
 716
 717           slot = strtoul(sessionid, &end, 16);
 718           dev->slot = end != sessionid && *end == '\0' ? slot : 0;
 719         } else
 720           dev->slot = 0;
 721       }
 722     }
 723   }
 724
 725   if (dev) {
 726     physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
 727     return &dev->dev;
 728   }
 729
 730   return NULL;
 731 }