ether.c revision 79854 
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 79854 2001-07-18 09:33:45Z 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 <net/if.h>
38#include <net/route.h>
39#include <netinet/in_systm.h>
40#include <netinet/ip.h>
41#include <netgraph/ng_ether.h>
42#include <netgraph/ng_message.h>
43#include <netgraph/ng_pppoe.h>
44#include <netgraph/ng_socket.h>
45
46#include <errno.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include <string.h>
50#include <sysexits.h>
51#include <sys/fcntl.h>
52#if defined(__FreeBSD__) && !defined(NOKLDLOAD)
53#include <sys/linker.h>
54#include <sys/module.h>
55#endif
56#include <sys/stat.h>
57#include <sys/uio.h>
58#include <termios.h>
59#include <sys/time.h>
60#include <unistd.h>
61
62#include "layer.h"
63#include "defs.h"
64#include "mbuf.h"
65#include "log.h"
66#include "timer.h"
67#include "lqr.h"
68#include "hdlc.h"
69#include "throughput.h"
70#include "fsm.h"
71#include "lcp.h"
72#include "ccp.h"
73#include "link.h"
74#include "async.h"
75#include "descriptor.h"
76#include "physical.h"
77#include "main.h"
78#include "mp.h"
79#include "chat.h"
80#include "auth.h"
81#include "chap.h"
82#include "cbcp.h"
83#include "datalink.h"
84#include "slcompress.h"
85#include "iplist.h"
86#include "ipcp.h"
87#include "filter.h"
88#ifndef NORADIUS
89#include "radius.h"
90#endif
91#include "bundle.h"
92#include "id.h"
93#include "iface.h"
94#include "ether.h"
95
96
97#define PPPOE_NODE_TYPE_LEN (sizeof NG_PPPOE_NODE_TYPE - 1) /* "PPPoE" */
98
99struct etherdevice {
100  struct device dev;			/* What struct physical knows about */
101  int cs;				/* Control socket */
102  int connected;			/* Are we connected yet ? */
103  int timeout;				/* Seconds attempting to connect */
104  char hook[sizeof TUN_NAME + 11];	/* Our socket node hook */
105};
106
107#define device2ether(d) \
108  ((d)->type == ETHER_DEVICE ? (struct etherdevice *)d : NULL)
109
110int
111ether_DeviceSize(void)
112{
113  return sizeof(struct etherdevice);
114}
115
116static ssize_t
117ether_Write(struct physical *p, const void *v, size_t n)
118{
119  struct etherdevice *dev = device2ether(p->handler);
120
121  return NgSendData(p->fd, dev->hook, v, n) == -1 ? -1 : n;
122}
123
124static ssize_t
125ether_Read(struct physical *p, void *v, size_t n)
126{
127  char hook[sizeof TUN_NAME + 11];
128
129  return NgRecvData(p->fd, v, n, hook);
130}
131
132static int
133ether_RemoveFromSet(struct physical *p, fd_set *r, fd_set *w, fd_set *e)
134{
135  struct etherdevice *dev = device2ether(p->handler);
136  int result;
137
138  if (r && dev->cs >= 0 && FD_ISSET(dev->cs, r)) {
139    FD_CLR(dev->cs, r);
140    log_Printf(LogTIMER, "%s: fdunset(ctrl) %d\n", p->link.name, dev->cs);
141    result = 1;
142  } else
143    result = 0;
144
145  /* Careful... physical_RemoveFromSet() called us ! */
146
147  p->handler->removefromset = NULL;
148  result += physical_RemoveFromSet(p, r, w, e);
149  p->handler->removefromset = ether_RemoveFromSet;
150
151  return result;
152}
153
154static void
155ether_Free(struct physical *p)
156{
157  struct etherdevice *dev = device2ether(p->handler);
158
159  physical_SetDescriptor(p);
160  if (dev->cs != -1)
161    close(dev->cs);
162  free(dev);
163}
164
165static const char *
166ether_OpenInfo(struct physical *p)
167{
168  struct etherdevice *dev = device2ether(p->handler);
169
170  switch (dev->connected) {
171    case CARRIER_PENDING:
172      return "negotiating";
173    case CARRIER_OK:
174      return "established";
175  }
176
177  return "disconnected";
178}
179
180static void
181ether_device2iov(struct device *d, struct iovec *iov, int *niov,
182                 int maxiov, int *auxfd, int *nauxfd)
183{
184  struct etherdevice *dev = device2ether(d);
185  int sz = physical_MaxDeviceSize();
186
187  iov[*niov].iov_base = realloc(d, sz);
188  if (iov[*niov].iov_base == NULL) {
189    log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz);
190    AbortProgram(EX_OSERR);
191  }
192  iov[*niov].iov_len = sz;
193  (*niov)++;
194
195  if (dev->cs >= 0) {
196    *auxfd = dev->cs;
197    (*nauxfd)++;
198  }
199}
200
201static void
202ether_MessageIn(struct etherdevice *dev)
203{
204  char msgbuf[sizeof(struct ng_mesg) + sizeof(struct ngpppoe_sts)];
205  struct ng_mesg *rep = (struct ng_mesg *)msgbuf;
206  struct ngpppoe_sts *sts = (struct ngpppoe_sts *)(msgbuf + sizeof *rep);
207  char unknown[14];
208  const char *msg;
209  struct timeval t;
210  fd_set *r;
211  int ret;
212
213  if (dev->cs < 0)
214    return;
215
216  if ((r = mkfdset()) == NULL) {
217    log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
218    return;
219  }
220  zerofdset(r);
221  FD_SET(dev->cs, r);
222  t.tv_sec = t.tv_usec = 0;
223  ret = select(dev->cs + 1, r, NULL, NULL, &t);
224  free(r);
225
226  if (ret <= 0)
227    return;
228
229  if (NgRecvMsg(dev->cs, rep, sizeof msgbuf, NULL) < 0)
230    return;
231
232  if (rep->header.version != NG_VERSION) {
233    log_Printf(LogWARN, "%ld: Unexpected netgraph version, expected %ld\n",
234               (long)rep->header.version, (long)NG_VERSION);
235    return;
236  }
237
238  if (rep->header.typecookie != NGM_PPPOE_COOKIE) {
239    log_Printf(LogWARN, "%ld: Unexpected netgraph cookie, expected %ld\n",
240               (long)rep->header.typecookie, (long)NGM_PPPOE_COOKIE);
241    return;
242  }
243
244  switch (rep->header.cmd) {
245    case NGM_PPPOE_SET_FLAG:	msg = "SET_FLAG";	break;
246    case NGM_PPPOE_CONNECT:	msg = "CONNECT";	break;
247    case NGM_PPPOE_LISTEN:	msg = "LISTEN";		break;
248    case NGM_PPPOE_OFFER:	msg = "OFFER";		break;
249    case NGM_PPPOE_SUCCESS:	msg = "SUCCESS";	break;
250    case NGM_PPPOE_FAIL:	msg = "FAIL";		break;
251    case NGM_PPPOE_CLOSE:	msg = "CLOSE";		break;
252    case NGM_PPPOE_GET_STATUS:	msg = "GET_STATUS";	break;
253    default:
254      snprintf(unknown, sizeof unknown, "<%d>", (int)rep->header.cmd);
255      msg = unknown;
256      break;
257  }
258
259  log_Printf(LogPHASE, "Received NGM_PPPOE_%s (hook \"%s\")\n", msg, sts->hook);
260
261  switch (rep->header.cmd) {
262    case NGM_PPPOE_SUCCESS:
263      dev->connected = CARRIER_OK;
264      break;
265    case NGM_PPPOE_FAIL:
266    case NGM_PPPOE_CLOSE:
267      dev->connected = CARRIER_LOST;
268      break;
269  }
270}
271
272static int
273ether_AwaitCarrier(struct physical *p)
274{
275  struct etherdevice *dev = device2ether(p->handler);
276
277  if (dev->connected != CARRIER_OK && !dev->timeout--)
278    dev->connected = CARRIER_LOST;
279  else if (dev->connected == CARRIER_PENDING)
280    ether_MessageIn(dev);
281
282  return dev->connected;
283}
284
285static const struct device baseetherdevice = {
286  ETHER_DEVICE,
287  "ether",
288  1492,
289  { CD_REQUIRED, DEF_ETHERCDDELAY },
290  ether_AwaitCarrier,
291  ether_RemoveFromSet,
292  NULL,
293  NULL,
294  NULL,
295  NULL,
296  ether_Free,
297  ether_Read,
298  ether_Write,
299  ether_device2iov,
300  NULL,
301  ether_OpenInfo
302};
303
304struct device *
305ether_iov2device(int type, struct physical *p, struct iovec *iov, int *niov,
306                 int maxiov, int *auxfd, int *nauxfd)
307{
308  if (type == ETHER_DEVICE) {
309    struct etherdevice *dev = (struct etherdevice *)iov[(*niov)++].iov_base;
310
311    dev = realloc(dev, sizeof *dev);	/* Reduce to the correct size */
312    if (dev == NULL) {
313      log_Printf(LogALERT, "Failed to allocate memory: %d\n",
314                 (int)(sizeof *dev));
315      AbortProgram(EX_OSERR);
316    }
317
318    if (*nauxfd) {
319      dev->cs = *auxfd;
320      (*nauxfd)--;
321    } else
322      dev->cs = -1;
323
324    /* Refresh function pointers etc */
325    memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
326
327    physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
328    return &dev->dev;
329  }
330
331  return NULL;
332}
333
334static int
335ether_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
336{
337  struct physical *p = descriptor2physical(d);
338  struct etherdevice *dev = device2ether(p->handler);
339  int result;
340
341  if (r && dev->cs >= 0) {
342    FD_SET(dev->cs, r);
343    log_Printf(LogTIMER, "%s(ctrl): fdset(r) %d\n", p->link.name, dev->cs);
344    result = 1;
345  } else
346    result = 0;
347
348  result += physical_doUpdateSet(d, r, w, e, n, 0);
349
350  return result;
351}
352
353static int
354ether_IsSet(struct fdescriptor *d, const fd_set *fdset)
355{
356  struct physical *p = descriptor2physical(d);
357  struct etherdevice *dev = device2ether(p->handler);
358  int result;
359
360  result = dev->cs >= 0 && FD_ISSET(dev->cs, fdset);
361  result += physical_IsSet(d, fdset);
362
363  return result;
364}
365
366static void
367ether_DescriptorRead(struct fdescriptor *d, struct bundle *bundle,
368                     const fd_set *fdset)
369{
370  struct physical *p = descriptor2physical(d);
371  struct etherdevice *dev = device2ether(p->handler);
372
373  if (dev->cs >= 0 && FD_ISSET(dev->cs, fdset)) {
374    ether_MessageIn(dev);
375    if (dev->connected == CARRIER_LOST) {
376      log_Printf(LogPHASE, "%s: Device disconnected\n", p->link.name);
377      datalink_Down(p->dl, CLOSE_NORMAL);
378      return;
379    }
380  }
381
382  if (physical_IsSet(d, fdset))
383    physical_DescriptorRead(d, bundle, fdset);
384}
385
386static struct device *
387ether_Abandon(struct etherdevice *dev, struct physical *p)
388{
389  /* Abandon our node construction */
390  close(dev->cs);
391  close(p->fd);
392  p->fd = -2;	/* Nobody else need try.. */
393  free(dev);
394
395  return NULL;
396}
397
398struct device *
399ether_Create(struct physical *p)
400{
401  u_char rbuf[2048];
402  struct etherdevice *dev;
403  struct ng_mesg *resp;
404  const struct hooklist *hlist;
405  const struct nodeinfo *ninfo;
406  char *path;
407  int ifacelen, f;
408
409  dev = NULL;
410  path = NULL;
411  ifacelen = 0;
412  if (p->fd < 0 && !strncasecmp(p->name.full, NG_PPPOE_NODE_TYPE,
413                                PPPOE_NODE_TYPE_LEN) &&
414      p->name.full[PPPOE_NODE_TYPE_LEN] == ':') {
415    const struct linkinfo *nlink;
416    struct ngpppoe_init_data *data;
417    struct ngm_mkpeer mkp;
418    struct ngm_connect ngc;
419    const char *iface, *provider;
420    char etherid[12];
421    int providerlen;
422    char connectpath[sizeof dev->hook + 2];	/* .:<hook> */
423
424    p->fd--;				/* We own the device - change fd */
425
426#if defined(__FreeBSD__) && !defined(NOKLDLOAD)
427    if (modfind("netgraph") == -1 && ID0kldload("netgraph") == -1) {
428      log_Printf(LogWARN, "kldload: netgraph: %s\n", strerror(errno));
429      return NULL;
430    }
431
432    if (modfind("ng_ether") == -1 && ID0kldload("ng_ether") == -1)
433      /*
434       * Don't treat this as an error as older kernels have this stuff
435       * built in as part of the netgraph node itself.
436       */
437      log_Printf(LogWARN, "kldload: ng_ether: %s\n", strerror(errno));
438
439    if (modfind("ng_pppoe") == -1 && ID0kldload("ng_pppoe") == -1) {
440      log_Printf(LogWARN, "kldload: ng_pppoe: %s\n", strerror(errno));
441      return NULL;
442    }
443
444    if (modfind("ng_socket") == -1 && ID0kldload("ng_socket") == -1) {
445      log_Printf(LogWARN, "kldload: ng_socket: %s\n", strerror(errno));
446      return NULL;
447    }
448#endif
449
450    if ((dev = malloc(sizeof *dev)) == NULL)
451      return NULL;
452
453    iface = p->name.full + PPPOE_NODE_TYPE_LEN + 1;
454
455    provider = strchr(iface, ':');
456    if (provider) {
457      ifacelen = provider - iface;
458      provider++;
459      providerlen = strlen(provider);
460    } else {
461      ifacelen = strlen(iface);
462      provider = "";
463      providerlen = 0;
464    }
465
466    /*
467     * We're going to do this (where tunN is our tunnel device):
468     *
469     * .---------.
470     * |  ether  |
471     * | <iface> |                         dev->cs
472     * `---------'                           |
473     *  (orphan)                     p->fd   |
474     *     |                           |     |
475     *     |                           |     |
476     * (ethernet)                      |     |
477     * .---------.                  .-----------.
478     * |  pppoe  |                  |  socket   |
479     * | <iface> |(tunN)<---->(tunN)| <unnamed> |
480     * `---------                   `-----------'
481     *   (tunX)
482     *     ^
483     *     |
484     *     `--->(tunX)
485     */
486
487    /* Create a socket node */
488    if (ID0NgMkSockNode(NULL, &dev->cs, &p->fd) == -1) {
489      log_Printf(LogWARN, "Cannot create netgraph socket node: %s\n",
490                 strerror(errno));
491      free(dev);
492      return NULL;
493    }
494
495    /*
496     * Ask for a list of hooks attached to the "ether" node.  This node should
497     * magically exist as a way of hooking stuff onto an ethernet device
498     */
499    path = (char *)alloca(ifacelen + 2);
500    sprintf(path, "%.*s:", ifacelen, iface);
501    if (NgSendMsg(dev->cs, path, NGM_GENERIC_COOKIE, NGM_LISTHOOKS,
502                  NULL, 0) < 0) {
503      log_Printf(LogWARN, "%s Cannot send a netgraph message: %s\n",
504                 path, strerror(errno));
505      return ether_Abandon(dev, p);
506    }
507
508    /* Get our list back */
509    resp = (struct ng_mesg *)rbuf;
510    if (NgRecvMsg(dev->cs, resp, sizeof rbuf, NULL) < 0) {
511      log_Printf(LogWARN, "Cannot get netgraph response: %s\n",
512                 strerror(errno));
513      return ether_Abandon(dev, p);
514    }
515
516    hlist = (const struct hooklist *)resp->data;
517    ninfo = &hlist->nodeinfo;
518
519    /* Make sure we've got the right type of node */
520    if (strncmp(ninfo->type, NG_ETHER_NODE_TYPE,
521                sizeof NG_ETHER_NODE_TYPE - 1)) {
522      log_Printf(LogWARN, "%s Unexpected node type ``%s'' (wanted ``"
523                 NG_ETHER_NODE_TYPE "'')\n", path, ninfo->type);
524      return ether_Abandon(dev, p);
525    }
526
527    log_Printf(LogDEBUG, "List of netgraph node ``%s'' (id %x) hooks:\n",
528               path, ninfo->id);
529
530    /* look for a hook already attached.  */
531    for (f = 0; f < ninfo->hooks; f++) {
532      nlink = &hlist->link[f];
533
534      log_Printf(LogDEBUG, "  Found %s -> %s\n", nlink->ourhook,
535                 nlink->peerhook);
536
537      if (!strcmp(nlink->ourhook, NG_ETHER_HOOK_ORPHAN) ||
538          !strcmp(nlink->ourhook, NG_ETHER_HOOK_DIVERT)) {
539        /*
540         * Something is using the data coming out of this ``ether'' node.
541         * If it's a PPPoE node, we use that node, otherwise we complain that
542         * someone else is using the node.
543         */
544        if (!strcmp(nlink->nodeinfo.type, NG_PPPOE_NODE_TYPE))
545          /* Use this PPPoE node ! */
546          snprintf(ngc.path, sizeof ngc.path, "[%x]:", nlink->nodeinfo.id);
547        else {
548          log_Printf(LogWARN, "%s Node type ``%s'' is currently active\n",
549                     path, nlink->nodeinfo.type);
550          return ether_Abandon(dev, p);
551        }
552        break;
553      }
554    }
555
556    if (f == ninfo->hooks) {
557      /*
558       * Create a new ``PPPoE'' node connected to the ``ether'' node using
559       * the magic ``orphan'' and ``ethernet'' hooks
560       */
561      snprintf(mkp.type, sizeof mkp.type, "%s", NG_PPPOE_NODE_TYPE);
562      snprintf(mkp.ourhook, sizeof mkp.ourhook, "%s", NG_ETHER_HOOK_ORPHAN);
563      snprintf(mkp.peerhook, sizeof mkp.peerhook, "%s", NG_PPPOE_HOOK_ETHERNET);
564      snprintf(etherid, sizeof etherid, "[%x]:", ninfo->id);
565
566      log_Printf(LogDEBUG, "Creating PPPoE netgraph node %s%s -> %s\n",
567                 etherid, mkp.ourhook, mkp.peerhook);
568
569      if (NgSendMsg(dev->cs, etherid, NGM_GENERIC_COOKIE,
570                    NGM_MKPEER, &mkp, sizeof mkp) < 0) {
571        log_Printf(LogWARN, "%s Cannot create PPPoE netgraph node: %s\n",
572                   etherid, strerror(errno));
573        return ether_Abandon(dev, p);
574      }
575
576      snprintf(ngc.path, sizeof ngc.path, "%s%s", path, NG_ETHER_HOOK_ORPHAN);
577    }
578
579    snprintf(dev->hook, sizeof dev->hook, "%s%d",
580             TUN_NAME, p->dl->bundle->unit);
581
582    /*
583     * Connect the PPPoE node to our socket node.
584     * ngc.path has already been set up
585     */
586    snprintf(ngc.ourhook, sizeof ngc.ourhook, "%s", dev->hook);
587    memcpy(ngc.peerhook, ngc.ourhook, sizeof ngc.peerhook);
588
589    log_Printf(LogDEBUG, "Connecting netgraph socket .:%s -> %s:%s\n",
590               ngc.ourhook, ngc.path, ngc.peerhook);
591    if (NgSendMsg(dev->cs, ".:", NGM_GENERIC_COOKIE,
592                  NGM_CONNECT, &ngc, sizeof ngc) < 0) {
593      log_Printf(LogWARN, "Cannot connect PPPoE and socket netgraph "
594                 "nodes: %s\n", strerror(errno));
595      return ether_Abandon(dev, p);
596    }
597
598    /* Bring the Ethernet interface up */
599    path[ifacelen] = '\0';	/* Remove the trailing ':' */
600    if (!iface_SetFlags(path, IFF_UP))
601      log_Printf(LogWARN, "%s: Failed to set the IFF_UP flag on %s\n",
602                 p->link.name, path);
603
604    /* And finally, request a connection to the given provider */
605
606    data = (struct ngpppoe_init_data *)alloca(sizeof *data + providerlen);
607    snprintf(data->hook, sizeof data->hook, "%s", dev->hook);
608    memcpy(data->data, provider, providerlen);
609    data->data_len = providerlen;
610
611    snprintf(connectpath, sizeof connectpath, ".:%s", dev->hook);
612    log_Printf(LogDEBUG, "Sending PPPOE_CONNECT to %s\n", connectpath);
613    if (NgSendMsg(dev->cs, connectpath, NGM_PPPOE_COOKIE,
614                  NGM_PPPOE_CONNECT, data, sizeof *data + providerlen) == -1) {
615      log_Printf(LogWARN, "``%s'': Cannot start netgraph node: %s\n",
616                 connectpath, strerror(errno));
617      return ether_Abandon(dev, p);
618    }
619
620    /* Hook things up so that we monitor dev->cs */
621    p->desc.UpdateSet = ether_UpdateSet;
622    p->desc.IsSet = ether_IsSet;
623    p->desc.Read = ether_DescriptorRead;
624
625    memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
626    switch (p->cfg.cd.necessity) {
627      case CD_VARIABLE:
628        dev->dev.cd.delay = p->cfg.cd.delay;
629        break;
630      case CD_REQUIRED:
631        dev->dev.cd = p->cfg.cd;
632        break;
633      case CD_NOTREQUIRED:
634        log_Printf(LogWARN, "%s: Carrier must be set, using ``set cd %d!''\n",
635                   p->link.name, dev->dev.cd.delay);
636      case CD_DEFAULT:
637        break;
638    }
639
640    dev->timeout = dev->dev.cd.delay;
641    dev->connected = CARRIER_PENDING;
642
643  } else {
644    /* See if we're a netgraph socket */
645    struct stat st;
646
647    if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFSOCK)) {
648      struct sockaddr_storage ssock;
649      struct sockaddr *sock = (struct sockaddr *)&ssock;
650      int sz;
651
652      sz = sizeof ssock;
653      if (getsockname(p->fd, sock, &sz) == -1) {
654        log_Printf(LogPHASE, "%s: Link is a closed socket !\n", p->link.name);
655        close(p->fd);
656        p->fd = -1;
657        return NULL;
658      }
659
660      if (sock->sa_family == AF_NETGRAPH) {
661        /*
662         * It's a netgraph node... We can't determine hook names etc, so we
663         * stay pretty impartial....
664         */
665        log_Printf(LogPHASE, "%s: Link is a netgraph node\n", p->link.name);
666
667        if ((dev = malloc(sizeof *dev)) == NULL) {
668          log_Printf(LogWARN, "%s: Cannot allocate an ether device: %s\n",
669                     p->link.name, strerror(errno));
670          return NULL;
671        }
672
673        memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
674        dev->cs = -1;
675        dev->timeout = 0;
676        dev->connected = CARRIER_OK;
677        *dev->hook = '\0';
678      }
679    }
680  }
681
682  if (dev) {
683    physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
684    return &dev->dev;
685  }
686
687  return NULL;
688}
689