xref: /freebsd/usr.sbin/ppp/ether.c (revision a0b9e2e854027e6ff61fb075a1309dbc71c42b54)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  *
28  * $FreeBSD$
29  */
30 
31 #include <sys/param.h>
32 #include <sys/socket.h>
33 #include <sys/un.h>
34 #include <netinet/in.h>
35 #include <arpa/inet.h>
36 #include <netdb.h>
37 #include <netgraph.h>
38 #include <net/ethernet.h>
39 #include <net/if.h>
40 #include <net/route.h>
41 #include <netinet/in_systm.h>
42 #include <netinet/ip.h>
43 #include <netgraph/ng_ether.h>
44 #include <netgraph/ng_message.h>
45 #include <netgraph/ng_pppoe.h>
46 #include <netgraph/ng_socket.h>
47 
48 #include <errno.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <sysexits.h>
53 #include <sys/fcntl.h>
54 #include <sys/stat.h>
55 #include <sys/uio.h>
56 #include <termios.h>
57 #include <sys/time.h>
58 #include <syslog.h>
59 #include <unistd.h>
60 
61 #include "layer.h"
62 #include "defs.h"
63 #include "mbuf.h"
64 #include "log.h"
65 #include "timer.h"
66 #include "lqr.h"
67 #include "hdlc.h"
68 #include "throughput.h"
69 #include "fsm.h"
70 #include "lcp.h"
71 #include "ccp.h"
72 #include "link.h"
73 #include "async.h"
74 #include "descriptor.h"
75 #include "physical.h"
76 #include "main.h"
77 #include "mp.h"
78 #include "chat.h"
79 #include "auth.h"
80 #include "chap.h"
81 #include "cbcp.h"
82 #include "datalink.h"
83 #include "slcompress.h"
84 #include "iplist.h"
85 #include "ncpaddr.h"
86 #include "ip.h"
87 #include "ipcp.h"
88 #include "filter.h"
89 #ifndef NORADIUS
90 #include "radius.h"
91 #endif
92 #include "ipv6cp.h"
93 #include "ncp.h"
94 #include "bundle.h"
95 #include "id.h"
96 #include "iface.h"
97 #include "route.h"
98 #include "ether.h"
99 
100 
101 #define PPPOE_NODE_TYPE_LEN (sizeof NG_PPPOE_NODE_TYPE - 1) /* "PPPoE" */
102 
103 struct etherdevice {
104   struct device dev;			/* What struct physical knows about */
105   int cs;				/* Control socket */
106   int connected;			/* Are we connected yet ? */
107   int timeout;				/* Seconds attempting to connect */
108   char hook[sizeof TUN_NAME + 11];	/* Our socket node hook */
109   u_int32_t slot;			/* ifindex << 24 | unit */
110 };
111 
112 #define device2ether(d) \
113   ((d)->type == ETHER_DEVICE ? (struct etherdevice *)d : NULL)
114 
115 unsigned
116 ether_DeviceSize(void)
117 {
118   return sizeof(struct etherdevice);
119 }
120 
121 static ssize_t
122 ether_Write(struct physical *p, const void *v, size_t n)
123 {
124   struct etherdevice *dev = device2ether(p->handler);
125 
126   return NgSendData(p->fd, dev->hook, v, n) == -1 ? -1 : (ssize_t)n;
127 }
128 
129 static ssize_t
130 ether_Read(struct physical *p, void *v, size_t n)
131 {
132   char hook[sizeof TUN_NAME + 11];
133 
134   return NgRecvData(p->fd, v, n, hook);
135 }
136 
137 static int
138 ether_RemoveFromSet(struct physical *p, fd_set *r, fd_set *w, fd_set *e)
139 {
140   struct etherdevice *dev = device2ether(p->handler);
141   int result;
142 
143   if (r && dev->cs >= 0 && FD_ISSET(dev->cs, r)) {
144     FD_CLR(dev->cs, r);
145     log_Printf(LogTIMER, "%s: fdunset(ctrl) %d\n", p->link.name, dev->cs);
146     result = 1;
147   } else
148     result = 0;
149 
150   /* Careful... physical_RemoveFromSet() called us ! */
151 
152   p->handler->removefromset = NULL;
153   result += physical_RemoveFromSet(p, r, w, e);
154   p->handler->removefromset = ether_RemoveFromSet;
155 
156   return result;
157 }
158 
159 static void
160 ether_Free(struct physical *p)
161 {
162   struct etherdevice *dev = device2ether(p->handler);
163 
164   physical_SetDescriptor(p);
165   if (dev->cs != -1)
166     close(dev->cs);
167   free(dev);
168 }
169 
170 static const char *
171 ether_OpenInfo(struct physical *p)
172 {
173   struct etherdevice *dev = device2ether(p->handler);
174 
175   switch (dev->connected) {
176     case CARRIER_PENDING:
177       return "negotiating";
178     case CARRIER_OK:
179       return "established";
180   }
181 
182   return "disconnected";
183 }
184 
185 static int
186 ether_Slot(struct physical *p)
187 {
188   struct etherdevice *dev = device2ether(p->handler);
189 
190   return dev->slot;
191 }
192 
193 
194 static void
195 ether_device2iov(struct device *d, struct iovec *iov, int *niov,
196                  int maxiov __unused, int *auxfd, int *nauxfd)
197 {
198   struct etherdevice *dev;
199   int sz = physical_MaxDeviceSize();
200 
201   iov[*niov].iov_base = d = realloc(d, sz);
202   if (d == NULL) {
203     log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz);
204     AbortProgram(EX_OSERR);
205   }
206   iov[*niov].iov_len = sz;
207   (*niov)++;
208 
209   dev = device2ether(d);
210   if (dev->cs >= 0) {
211     *auxfd = dev->cs;
212     (*nauxfd)++;
213   }
214 }
215 
216 static void
217 ether_MessageIn(struct etherdevice *dev)
218 {
219   char msgbuf[sizeof(struct ng_mesg) + sizeof(struct ngpppoe_sts)];
220   struct ng_mesg *rep = (struct ng_mesg *)msgbuf;
221   struct ngpppoe_sts *sts = (struct ngpppoe_sts *)(msgbuf + sizeof *rep);
222   char *end, unknown[14], sessionid[5];
223   const char *msg;
224   struct timeval t;
225   fd_set *r;
226   u_long slot;
227   int asciilen, ret;
228 
229   if (dev->cs < 0)
230     return;
231 
232   if ((r = mkfdset()) == NULL) {
233     log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
234     return;
235   }
236 
237   while (1) {
238     zerofdset(r);
239     FD_SET(dev->cs, r);
240     t.tv_sec = t.tv_usec = 0;
241     ret = select(dev->cs + 1, r, NULL, NULL, &t);
242 
243     if (ret <= 0)
244       break;
245 
246     if (NgRecvMsg(dev->cs, rep, sizeof msgbuf, NULL) <= 0)
247       break;
248 
249     if (rep->header.version != NG_VERSION) {
250       log_Printf(LogWARN, "%ld: Unexpected netgraph version, expected %ld\n",
251                  (long)rep->header.version, (long)NG_VERSION);
252       break;
253     }
254 
255     if (rep->header.typecookie != NGM_PPPOE_COOKIE) {
256       log_Printf(LogWARN, "%ld: Unexpected netgraph cookie, expected %ld\n",
257                  (long)rep->header.typecookie, (long)NGM_PPPOE_COOKIE);
258       break;
259     }
260 
261     asciilen = 0;
262     switch (rep->header.cmd) {
263       case NGM_PPPOE_SET_FLAG:	msg = "SET_FLAG";	break;
264       case NGM_PPPOE_CONNECT:	msg = "CONNECT";	break;
265       case NGM_PPPOE_LISTEN:	msg = "LISTEN";		break;
266       case NGM_PPPOE_OFFER:	msg = "OFFER";		break;
267       case NGM_PPPOE_SUCCESS:	msg = "SUCCESS";	break;
268       case NGM_PPPOE_FAIL:	msg = "FAIL";		break;
269       case NGM_PPPOE_CLOSE:	msg = "CLOSE";		break;
270       case NGM_PPPOE_GET_STATUS:	msg = "GET_STATUS";	break;
271       case NGM_PPPOE_ACNAME:
272         msg = "ACNAME";
273         if (setenv("ACNAME", sts->hook, 1) != 0)
274           log_Printf(LogWARN, "setenv: cannot set ACNAME=%s: %m", sts->hook);
275         asciilen = rep->header.arglen;
276         break;
277       case NGM_PPPOE_SESSIONID:
278         msg = "SESSIONID";
279         snprintf(sessionid, sizeof sessionid, "%04x", *(u_int16_t *)sts);
280         if (setenv("SESSIONID", sessionid, 1) != 0)
281           syslog(LOG_WARNING, "setenv: cannot set SESSIONID=%s: %m",
282                  sessionid);
283         /* Use this in preference to our interface index */
284         slot = strtoul(sessionid, &end, 16);
285         if (end != sessionid && *end == '\0')
286             dev->slot = slot;
287         break;
288       default:
289         snprintf(unknown, sizeof unknown, "<%d>", (int)rep->header.cmd);
290         msg = unknown;
291         break;
292     }
293 
294     if (asciilen)
295       log_Printf(LogPHASE, "Received NGM_PPPOE_%s (hook \"%.*s\")\n",
296                  msg, asciilen, sts->hook);
297     else
298       log_Printf(LogPHASE, "Received NGM_PPPOE_%s\n", msg);
299 
300     switch (rep->header.cmd) {
301       case NGM_PPPOE_SUCCESS:
302         dev->connected = CARRIER_OK;
303         break;
304       case NGM_PPPOE_FAIL:
305       case NGM_PPPOE_CLOSE:
306         dev->connected = CARRIER_LOST;
307         break;
308     }
309   }
310   free(r);
311 }
312 
313 static int
314 ether_AwaitCarrier(struct physical *p)
315 {
316   struct etherdevice *dev = device2ether(p->handler);
317 
318   if (dev->connected != CARRIER_OK && !dev->timeout--)
319     dev->connected = CARRIER_LOST;
320   else if (dev->connected == CARRIER_PENDING)
321     ether_MessageIn(dev);
322 
323   return dev->connected;
324 }
325 
326 static const struct device baseetherdevice = {
327   ETHER_DEVICE,
328   "ether",
329   1492,
330   { CD_REQUIRED, DEF_ETHERCDDELAY },
331   ether_AwaitCarrier,
332   ether_RemoveFromSet,
333   NULL,
334   NULL,
335   NULL,
336   NULL,
337   NULL,
338   ether_Free,
339   ether_Read,
340   ether_Write,
341   ether_device2iov,
342   NULL,
343   ether_OpenInfo,
344   ether_Slot
345 };
346 
347 struct device *
348 ether_iov2device(int type, struct physical *p, struct iovec *iov, int *niov,
349                  int maxiov __unused, int *auxfd, int *nauxfd)
350 {
351   if (type == ETHER_DEVICE) {
352     struct etherdevice *dev = (struct etherdevice *)iov[(*niov)++].iov_base;
353 
354     dev = realloc(dev, sizeof *dev);	/* Reduce to the correct size */
355     if (dev == NULL) {
356       log_Printf(LogALERT, "Failed to allocate memory: %d\n",
357                  (int)(sizeof *dev));
358       AbortProgram(EX_OSERR);
359     }
360 
361     if (*nauxfd) {
362       dev->cs = *auxfd;
363       (*nauxfd)--;
364     } else
365       dev->cs = -1;
366 
367     /* Refresh function pointers etc */
368     memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
369 
370     physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
371     return &dev->dev;
372   }
373 
374   return NULL;
375 }
376 
377 static int
378 ether_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
379 {
380   struct physical *p = descriptor2physical(d);
381   struct etherdevice *dev = device2ether(p->handler);
382   int result;
383 
384   if (r && dev->cs >= 0) {
385     FD_SET(dev->cs, r);
386     log_Printf(LogTIMER, "%s(ctrl): fdset(r) %d\n", p->link.name, dev->cs);
387     result = 1;
388   } else
389     result = 0;
390 
391   result += physical_doUpdateSet(d, r, w, e, n, 0);
392 
393   return result;
394 }
395 
396 static int
397 ether_IsSet(struct fdescriptor *d, const fd_set *fdset)
398 {
399   struct physical *p = descriptor2physical(d);
400   struct etherdevice *dev = device2ether(p->handler);
401   int result;
402 
403   result = dev->cs >= 0 && FD_ISSET(dev->cs, fdset);
404   result += physical_IsSet(d, fdset);
405 
406   return result;
407 }
408 
409 static void
410 ether_DescriptorRead(struct fdescriptor *d, struct bundle *bundle,
411                      const fd_set *fdset)
412 {
413   struct physical *p = descriptor2physical(d);
414   struct etherdevice *dev = device2ether(p->handler);
415 
416   if (dev->cs >= 0 && FD_ISSET(dev->cs, fdset)) {
417     ether_MessageIn(dev);
418     if (dev->connected == CARRIER_LOST) {
419       log_Printf(LogPHASE, "%s: Device disconnected\n", p->link.name);
420       datalink_Down(p->dl, CLOSE_NORMAL);
421       return;
422     }
423   }
424 
425   if (physical_IsSet(d, fdset))
426     physical_DescriptorRead(d, bundle, fdset);
427 }
428 
429 static struct device *
430 ether_Abandon(struct etherdevice *dev, struct physical *p)
431 {
432   /* Abandon our node construction */
433   close(dev->cs);
434   close(p->fd);
435   p->fd = -2;	/* Nobody else need try.. */
436   free(dev);
437 
438   return NULL;
439 }
440 
441 struct device *
442 ether_Create(struct physical *p)
443 {
444   u_char rbuf[2048];
445   struct etherdevice *dev;
446   struct ng_mesg *resp;
447   const struct hooklist *hlist;
448   const struct nodeinfo *ninfo;
449   char *path, *sessionid;
450   const char *mode;
451   size_t ifacelen;
452   unsigned f;
453 
454   dev = NULL;
455   path = NULL;
456   ifacelen = 0;
457   if (p->fd < 0 && !strncasecmp(p->name.full, NG_PPPOE_NODE_TYPE,
458                                 PPPOE_NODE_TYPE_LEN) &&
459       p->name.full[PPPOE_NODE_TYPE_LEN] == ':') {
460     const struct linkinfo *nlink;
461     struct ngpppoe_init_data *data;
462     struct ngm_mkpeer mkp;
463     struct ngm_connect ngc;
464     const char *iface, *provider;
465     char etherid[12];
466     int providerlen;
467     char connectpath[sizeof dev->hook + 2];	/* .:<hook> */
468 
469     p->fd--;				/* We own the device - change fd */
470 
471     loadmodules(LOAD_VERBOSLY, "netgraph", "ng_ether", "ng_pppoe", "ng_socket",
472                 NULL);
473 
474     if ((dev = malloc(sizeof *dev)) == NULL)
475       return NULL;
476 
477     iface = p->name.full + PPPOE_NODE_TYPE_LEN + 1;
478 
479     provider = strchr(iface, ':');
480     if (provider) {
481       ifacelen = provider - iface;
482       provider++;
483       providerlen = strlen(provider);
484     } else {
485       ifacelen = strlen(iface);
486       provider = "";
487       providerlen = 0;
488     }
489 
490     /*
491      * We're going to do this (where tunN is our tunnel device):
492      *
493      * .---------.
494      * |  ether  |
495      * | <iface> |                         dev->cs
496      * `---------'                           |
497      *  (orphan)                     p->fd   |
498      *     |                           |     |
499      *     |                           |     |
500      * (ethernet)                      |     |
501      * .---------.                  .-----------.
502      * |  pppoe  |                  |  socket   |
503      * | <iface> |(tunN)<---->(tunN)| <unnamed> |
504      * `---------                   `-----------'
505      *   (tunX)
506      *     ^
507      *     |
508      *     `--->(tunX)
509      */
510 
511     /* Create a socket node */
512     if (ID0NgMkSockNode(NULL, &dev->cs, &p->fd) == -1) {
513       log_Printf(LogWARN, "Cannot create netgraph socket node: %s\n",
514                  strerror(errno));
515       free(dev);
516       p->fd = -2;
517       return NULL;
518     }
519 
520     /*
521      * Ask for a list of hooks attached to the "ether" node.  This node should
522      * magically exist as a way of hooking stuff onto an ethernet device
523      */
524     path = (char *)alloca(ifacelen + 2);
525     sprintf(path, "%.*s:", (int)ifacelen, iface);
526     if (NgSendMsg(dev->cs, path, NGM_GENERIC_COOKIE, NGM_LISTHOOKS,
527                   NULL, 0) < 0) {
528       log_Printf(LogWARN, "%s Cannot send a netgraph message: %s\n",
529                  path, strerror(errno));
530       return ether_Abandon(dev, p);
531     }
532 
533     /* Get our list back */
534     resp = (struct ng_mesg *)rbuf;
535     if (NgRecvMsg(dev->cs, resp, sizeof rbuf, NULL) <= 0) {
536       log_Printf(LogWARN, "Cannot get netgraph response: %s\n",
537                  strerror(errno));
538       return ether_Abandon(dev, p);
539     }
540 
541     hlist = (const struct hooklist *)resp->data;
542     ninfo = &hlist->nodeinfo;
543 
544     /* Make sure we've got the right type of node */
545     if (strncmp(ninfo->type, NG_ETHER_NODE_TYPE,
546                 sizeof NG_ETHER_NODE_TYPE - 1)) {
547       log_Printf(LogWARN, "%s Unexpected node type ``%s'' (wanted ``"
548                  NG_ETHER_NODE_TYPE "'')\n", path, ninfo->type);
549       return ether_Abandon(dev, p);
550     }
551 
552     log_Printf(LogDEBUG, "List of netgraph node ``%s'' (id %x) hooks:\n",
553                path, ninfo->id);
554 
555     /* look for a hook already attached.  */
556     for (f = 0; f < ninfo->hooks; f++) {
557       nlink = &hlist->link[f];
558 
559       log_Printf(LogDEBUG, "  Found %s -> %s\n", nlink->ourhook,
560                  nlink->peerhook);
561 
562       if (!strcmp(nlink->ourhook, NG_ETHER_HOOK_ORPHAN) ||
563           !strcmp(nlink->ourhook, NG_ETHER_HOOK_DIVERT)) {
564         /*
565          * Something is using the data coming out of this ``ether'' node.
566          * If it's a PPPoE node, we use that node, otherwise we complain that
567          * someone else is using the node.
568          */
569         if (!strcmp(nlink->nodeinfo.type, NG_PPPOE_NODE_TYPE))
570           /* Use this PPPoE node ! */
571           snprintf(ngc.path, sizeof ngc.path, "[%x]:", nlink->nodeinfo.id);
572         else {
573           log_Printf(LogWARN, "%s Node type ``%s'' is currently active\n",
574                      path, nlink->nodeinfo.type);
575           return ether_Abandon(dev, p);
576         }
577         break;
578       }
579     }
580 
581     if (f == ninfo->hooks) {
582       /*
583        * Create a new ``PPPoE'' node connected to the ``ether'' node using
584        * the ``orphan'' and ``ethernet'' hooks
585        */
586       snprintf(mkp.type, sizeof mkp.type, "%s", NG_PPPOE_NODE_TYPE);
587       snprintf(mkp.ourhook, sizeof mkp.ourhook, "%s", NG_ETHER_HOOK_ORPHAN);
588       snprintf(mkp.peerhook, sizeof mkp.peerhook, "%s", NG_PPPOE_HOOK_ETHERNET);
589       snprintf(etherid, sizeof etherid, "[%x]:", ninfo->id);
590 
591       log_Printf(LogDEBUG, "Creating PPPoE netgraph node %s%s -> %s\n",
592                  etherid, mkp.ourhook, mkp.peerhook);
593 
594       if (NgSendMsg(dev->cs, etherid, NGM_GENERIC_COOKIE,
595                     NGM_MKPEER, &mkp, sizeof mkp) < 0) {
596         log_Printf(LogWARN, "%s Cannot create PPPoE netgraph node: %s\n",
597                    etherid, strerror(errno));
598         return ether_Abandon(dev, p);
599       }
600 
601       snprintf(ngc.path, sizeof ngc.path, "%s%s", path, NG_ETHER_HOOK_ORPHAN);
602     }
603 
604     snprintf(dev->hook, sizeof dev->hook, "%s%d",
605              TUN_NAME, p->dl->bundle->unit);
606 
607     /*
608      * Connect the PPPoE node to our socket node.
609      * ngc.path has already been set up
610      */
611     snprintf(ngc.ourhook, sizeof ngc.ourhook, "%s", dev->hook);
612     memcpy(ngc.peerhook, ngc.ourhook, sizeof ngc.peerhook);
613 
614     log_Printf(LogDEBUG, "Connecting netgraph socket .:%s -> %s:%s\n",
615                ngc.ourhook, ngc.path, ngc.peerhook);
616     if (NgSendMsg(dev->cs, ".:", NGM_GENERIC_COOKIE,
617                   NGM_CONNECT, &ngc, sizeof ngc) < 0) {
618       log_Printf(LogWARN, "Cannot connect PPPoE and socket netgraph "
619                  "nodes: %s\n", strerror(errno));
620       return ether_Abandon(dev, p);
621     }
622 
623     /* Bring the Ethernet interface up */
624     path[ifacelen] = '\0';	/* Remove the trailing ':' */
625     if (!iface_SetFlags(path, IFF_UP))
626       log_Printf(LogWARN, "%s: Failed to set the IFF_UP flag on %s\n",
627                  p->link.name, path);
628 
629     snprintf(connectpath, sizeof connectpath, ".:%s", dev->hook);
630 
631     /* Configure node to 3Com mode if needed */
632     if (p->cfg.pppoe_configured) {
633       mode = p->cfg.nonstandard_pppoe ? NG_PPPOE_NONSTANDARD : NG_PPPOE_STANDARD;
634       if (NgSendMsg(dev->cs, connectpath, NGM_PPPOE_COOKIE,
635 		NGM_PPPOE_SETMODE, mode, strlen(mode) + 1) == -1) {
636         log_Printf(LogWARN, "``%s'': Cannot configure netgraph node: %s\n",
637                  connectpath, strerror(errno));
638         return ether_Abandon(dev, p);
639       }
640     }
641 
642     /* And finally, request a connection to the given provider */
643 
644     data = (struct ngpppoe_init_data *)alloca(sizeof *data + providerlen);
645     snprintf(data->hook, sizeof data->hook, "%s", dev->hook);
646     memcpy(data->data, provider, providerlen);
647     data->data_len = providerlen;
648 
649     log_Printf(LogDEBUG, "Sending PPPOE_CONNECT to %s\n", connectpath);
650     if (NgSendMsg(dev->cs, connectpath, NGM_PPPOE_COOKIE,
651                   NGM_PPPOE_CONNECT, data, sizeof *data + providerlen) == -1) {
652       log_Printf(LogWARN, "``%s'': Cannot start netgraph node: %s\n",
653                  connectpath, strerror(errno));
654       return ether_Abandon(dev, p);
655     }
656 
657     /* Hook things up so that we monitor dev->cs */
658     p->desc.UpdateSet = ether_UpdateSet;
659     p->desc.IsSet = ether_IsSet;
660     p->desc.Read = ether_DescriptorRead;
661 
662     memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
663     switch (p->cfg.cd.necessity) {
664       case CD_VARIABLE:
665         dev->dev.cd.delay = p->cfg.cd.delay;
666         break;
667       case CD_REQUIRED:
668         dev->dev.cd = p->cfg.cd;
669         break;
670       case CD_NOTREQUIRED:
671         log_Printf(LogWARN, "%s: Carrier must be set, using ``set cd %d!''\n",
672                    p->link.name, dev->dev.cd.delay);
673       case CD_DEFAULT:
674         break;
675     }
676 
677     dev->timeout = dev->dev.cd.delay;
678     dev->connected = CARRIER_PENDING;
679     /* This will be overridden by our session id - if provided by netgraph */
680     dev->slot = GetIfIndex(path);
681   } else {
682     /* See if we're a netgraph socket */
683     struct stat st;
684 
685     if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFSOCK)) {
686       struct sockaddr_storage ssock;
687       struct sockaddr *sock = (struct sockaddr *)&ssock;
688       int sz;
689 
690       sz = sizeof ssock;
691       if (getsockname(p->fd, sock, &sz) == -1) {
692         log_Printf(LogPHASE, "%s: Link is a closed socket !\n", p->link.name);
693         close(p->fd);
694         p->fd = -1;
695         return NULL;
696       }
697 
698       if (sock->sa_family == AF_NETGRAPH) {
699         /*
700          * It's a netgraph node... We can't determine hook names etc, so we
701          * stay pretty impartial....
702          */
703         log_Printf(LogPHASE, "%s: Link is a netgraph node\n", p->link.name);
704 
705         if ((dev = malloc(sizeof *dev)) == NULL) {
706           log_Printf(LogWARN, "%s: Cannot allocate an ether device: %s\n",
707                      p->link.name, strerror(errno));
708           return NULL;
709         }
710 
711         memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
712         dev->cs = -1;
713         dev->timeout = 0;
714         dev->connected = CARRIER_OK;
715         *dev->hook = '\0';
716 
717         /*
718          * If we're being envoked from pppoed(8), we may have a SESSIONID
719          * set in the environment.  If so, use it as the slot
720          */
721         if ((sessionid = getenv("SESSIONID")) != NULL) {
722           char *end;
723           u_long slot;
724 
725           slot = strtoul(sessionid, &end, 16);
726           dev->slot = end != sessionid && *end == '\0' ? slot : 0;
727         } else
728           dev->slot = 0;
729       }
730     }
731   }
732 
733   if (dev) {
734     physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
735     return &dev->dev;
736   }
737 
738   return NULL;
739 }
740