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      1 /*-
      2  * Copyright (c) 1999 Brian Somers <brian (at) 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 1.30.10.1.4.1 2010/12/21 17:10:29 kensmith Exp $
     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 #include <sys/stat.h>
     53 #include <sys/uio.h>
     54 #include <termios.h>
     55 #include <sys/time.h>
     56 #include <syslog.h>
     57 #include <unistd.h>
     58 
     59 #include "layer.h"
     60 #include "defs.h"
     61 #include "mbuf.h"
     62 #include "log.h"
     63 #include "timer.h"
     64 #include "lqr.h"
     65 #include "hdlc.h"
     66 #include "throughput.h"
     67 #include "fsm.h"
     68 #include "lcp.h"
     69 #include "ccp.h"
     70 #include "link.h"
     71 #include "async.h"
     72 #include "descriptor.h"
     73 #include "physical.h"
     74 #include "main.h"
     75 #include "mp.h"
     76 #include "chat.h"
     77 #include "auth.h"
     78 #include "chap.h"
     79 #include "cbcp.h"
     80 #include "datalink.h"
     81 #include "slcompress.h"
     82 #include "iplist.h"
     83 #include "ncpaddr.h"
     84 #include "ip.h"
     85 #include "ipcp.h"
     86 #include "filter.h"
     87 #ifndef NORADIUS
     88 #include "radius.h"
     89 #endif
     90 #include "ipv6cp.h"
     91 #include "ncp.h"
     92 #include "bundle.h"
     93 #include "id.h"
     94 #include "iface.h"
     95 #include "route.h"
     96 #include "ether.h"
     97 
     98 
     99 #define PPPOE_NODE_TYPE_LEN (sizeof NG_PPPOE_NODE_TYPE - 1) /* "PPPoE" */
    100 
    101 struct etherdevice {
    102   struct device dev;			/* What struct physical knows about */
    103   int cs;				/* Control socket */
    104   int connected;			/* Are we connected yet ? */
    105   int timeout;				/* Seconds attempting to connect */
    106   char hook[sizeof TUN_NAME + 11];	/* Our socket node hook */
    107   u_int32_t slot;			/* ifindex << 24 | unit */
    108 };
    109 
    110 #define device2ether(d) \
    111   ((d)->type == ETHER_DEVICE ? (struct etherdevice *)d : NULL)
    112 
    113 unsigned
    114 ether_DeviceSize(void)
    115 {
    116   return sizeof(struct etherdevice);
    117 }
    118 
    119 static ssize_t
    120 ether_Write(struct physical *p, const void *v, size_t n)
    121 {
    122   struct etherdevice *dev = device2ether(p->handler);
    123 
    124   return NgSendData(p->fd, dev->hook, v, n) == -1 ? -1 : (ssize_t)n;
    125 }
    126 
    127 static ssize_t
    128 ether_Read(struct physical *p, void *v, size_t n)
    129 {
    130   char hook[sizeof TUN_NAME + 11];
    131 
    132   return NgRecvData(p->fd, v, n, hook);
    133 }
    134 
    135 static int
    136 ether_RemoveFromSet(struct physical *p, fd_set *r, fd_set *w, fd_set *e)
    137 {
    138   struct etherdevice *dev = device2ether(p->handler);
    139   int result;
    140 
    141   if (r && dev->cs >= 0 && FD_ISSET(dev->cs, r)) {
    142     FD_CLR(dev->cs, r);
    143     log_Printf(LogTIMER, "%s: fdunset(ctrl) %d\n", p->link.name, dev->cs);
    144     result = 1;
    145   } else
    146     result = 0;
    147 
    148   /* Careful... physical_RemoveFromSet() called us ! */
    149 
    150   p->handler->removefromset = NULL;
    151   result += physical_RemoveFromSet(p, r, w, e);
    152   p->handler->removefromset = ether_RemoveFromSet;
    153 
    154   return result;
    155 }
    156 
    157 static void
    158 ether_Free(struct physical *p)
    159 {
    160   struct etherdevice *dev = device2ether(p->handler);
    161 
    162   physical_SetDescriptor(p);
    163   if (dev->cs != -1)
    164     close(dev->cs);
    165   free(dev);
    166 }
    167 
    168 static const char *
    169 ether_OpenInfo(struct physical *p)
    170 {
    171   struct etherdevice *dev = device2ether(p->handler);
    172 
    173   switch (dev->connected) {
    174     case CARRIER_PENDING:
    175       return "negotiating";
    176     case CARRIER_OK:
    177       return "established";
    178   }
    179 
    180   return "disconnected";
    181 }
    182 
    183 static int
    184 ether_Slot(struct physical *p)
    185 {
    186   struct etherdevice *dev = device2ether(p->handler);
    187 
    188   return dev->slot;
    189 }
    190 
    191 
    192 static void
    193 ether_device2iov(struct device *d, struct iovec *iov, int *niov,
    194                  int maxiov __unused, int *auxfd, int *nauxfd)
    195 {
    196   struct etherdevice *dev;
    197   int sz = physical_MaxDeviceSize();
    198 
    199   iov[*niov].iov_base = d = realloc(d, sz);
    200   if (d == NULL) {
    201     log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz);
    202     AbortProgram(EX_OSERR);
    203   }
    204   iov[*niov].iov_len = sz;
    205   (*niov)++;
    206 
    207   dev = device2ether(d);
    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 __unused, 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   const char *mode;
    449   size_t ifacelen;
    450   unsigned f;
    451 
    452   dev = NULL;
    453   path = NULL;
    454   ifacelen = 0;
    455   if (p->fd < 0 && !strncasecmp(p->name.full, NG_PPPOE_NODE_TYPE,
    456                                 PPPOE_NODE_TYPE_LEN) &&
    457       p->name.full[PPPOE_NODE_TYPE_LEN] == ':') {
    458     const struct linkinfo *nlink;
    459     struct ngpppoe_init_data *data;
    460     struct ngm_mkpeer mkp;
    461     struct ngm_connect ngc;
    462     const char *iface, *provider;
    463     char etherid[12];
    464     int providerlen;
    465     char connectpath[sizeof dev->hook + 2];	/* .:<hook> */
    466 
    467     p->fd--;				/* We own the device - change fd */
    468 
    469     loadmodules(LOAD_VERBOSLY, "netgraph", "ng_ether", "ng_pppoe", "ng_socket",
    470                 NULL);
    471 
    472     if ((dev = malloc(sizeof *dev)) == NULL)
    473       return NULL;
    474 
    475     iface = p->name.full + PPPOE_NODE_TYPE_LEN + 1;
    476 
    477     provider = strchr(iface, ':');
    478     if (provider) {
    479       ifacelen = provider - iface;
    480       provider++;
    481       providerlen = strlen(provider);
    482     } else {
    483       ifacelen = strlen(iface);
    484       provider = "";
    485       providerlen = 0;
    486     }
    487 
    488     /*
    489      * We're going to do this (where tunN is our tunnel device):
    490      *
    491      * .---------.
    492      * |  ether  |
    493      * | <iface> |                         dev->cs
    494      * `---------'                           |
    495      *  (orphan)                     p->fd   |
    496      *     |                           |     |
    497      *     |                           |     |
    498      * (ethernet)                      |     |
    499      * .---------.                  .-----------.
    500      * |  pppoe  |                  |  socket   |
    501      * | <iface> |(tunN)<---->(tunN)| <unnamed> |
    502      * `---------                   `-----------'
    503      *   (tunX)
    504      *     ^
    505      *     |
    506      *     `--->(tunX)
    507      */
    508 
    509     /* Create a socket node */
    510     if (ID0NgMkSockNode(NULL, &dev->cs, &p->fd) == -1) {
    511       log_Printf(LogWARN, "Cannot create netgraph socket node: %s\n",
    512                  strerror(errno));
    513       free(dev);
    514       p->fd = -2;
    515       return NULL;
    516     }
    517 
    518     /*
    519      * Ask for a list of hooks attached to the "ether" node.  This node should
    520      * magically exist as a way of hooking stuff onto an ethernet device
    521      */
    522     path = (char *)alloca(ifacelen + 2);
    523     sprintf(path, "%.*s:", (int)ifacelen, iface);
    524     if (NgSendMsg(dev->cs, path, NGM_GENERIC_COOKIE, NGM_LISTHOOKS,
    525                   NULL, 0) < 0) {
    526       log_Printf(LogWARN, "%s Cannot send a netgraph message: %s\n",
    527                  path, strerror(errno));
    528       return ether_Abandon(dev, p);
    529     }
    530 
    531     /* Get our list back */
    532     resp = (struct ng_mesg *)rbuf;
    533     if (NgRecvMsg(dev->cs, resp, sizeof rbuf, NULL) <= 0) {
    534       log_Printf(LogWARN, "Cannot get netgraph response: %s\n",
    535                  strerror(errno));
    536       return ether_Abandon(dev, p);
    537     }
    538 
    539     hlist = (const struct hooklist *)resp->data;
    540     ninfo = &hlist->nodeinfo;
    541 
    542     /* Make sure we've got the right type of node */
    543     if (strncmp(ninfo->type, NG_ETHER_NODE_TYPE,
    544                 sizeof NG_ETHER_NODE_TYPE - 1)) {
    545       log_Printf(LogWARN, "%s Unexpected node type ``%s'' (wanted ``"
    546                  NG_ETHER_NODE_TYPE "'')\n", path, ninfo->type);
    547       return ether_Abandon(dev, p);
    548     }
    549 
    550     log_Printf(LogDEBUG, "List of netgraph node ``%s'' (id %x) hooks:\n",
    551                path, ninfo->id);
    552 
    553     /* look for a hook already attached.  */
    554     for (f = 0; f < ninfo->hooks; f++) {
    555       nlink = &hlist->link[f];
    556 
    557       log_Printf(LogDEBUG, "  Found %s -> %s\n", nlink->ourhook,
    558                  nlink->peerhook);
    559 
    560       if (!strcmp(nlink->ourhook, NG_ETHER_HOOK_ORPHAN) ||
    561           !strcmp(nlink->ourhook, NG_ETHER_HOOK_DIVERT)) {
    562         /*
    563          * Something is using the data coming out of this ``ether'' node.
    564          * If it's a PPPoE node, we use that node, otherwise we complain that
    565          * someone else is using the node.
    566          */
    567         if (!strcmp(nlink->nodeinfo.type, NG_PPPOE_NODE_TYPE))
    568           /* Use this PPPoE node ! */
    569           snprintf(ngc.path, sizeof ngc.path, "[%x]:", nlink->nodeinfo.id);
    570         else {
    571           log_Printf(LogWARN, "%s Node type ``%s'' is currently active\n",
    572                      path, nlink->nodeinfo.type);
    573           return ether_Abandon(dev, p);
    574         }
    575         break;
    576       }
    577     }
    578 
    579     if (f == ninfo->hooks) {
    580       /*
    581        * Create a new ``PPPoE'' node connected to the ``ether'' node using
    582        * the ``orphan'' and ``ethernet'' hooks
    583        */
    584       snprintf(mkp.type, sizeof mkp.type, "%s", NG_PPPOE_NODE_TYPE);
    585       snprintf(mkp.ourhook, sizeof mkp.ourhook, "%s", NG_ETHER_HOOK_ORPHAN);
    586       snprintf(mkp.peerhook, sizeof mkp.peerhook, "%s", NG_PPPOE_HOOK_ETHERNET);
    587       snprintf(etherid, sizeof etherid, "[%x]:", ninfo->id);
    588 
    589       log_Printf(LogDEBUG, "Creating PPPoE netgraph node %s%s -> %s\n",
    590                  etherid, mkp.ourhook, mkp.peerhook);
    591 
    592       if (NgSendMsg(dev->cs, etherid, NGM_GENERIC_COOKIE,
    593                     NGM_MKPEER, &mkp, sizeof mkp) < 0) {
    594         log_Printf(LogWARN, "%s Cannot create PPPoE netgraph node: %s\n",
    595                    etherid, strerror(errno));
    596         return ether_Abandon(dev, p);
    597       }
    598 
    599       snprintf(ngc.path, sizeof ngc.path, "%s%s", path, NG_ETHER_HOOK_ORPHAN);
    600     }
    601 
    602     snprintf(dev->hook, sizeof dev->hook, "%s%d",
    603              TUN_NAME, p->dl->bundle->unit);
    604 
    605     /*
    606      * Connect the PPPoE node to our socket node.
    607      * ngc.path has already been set up
    608      */
    609     snprintf(ngc.ourhook, sizeof ngc.ourhook, "%s", dev->hook);
    610     memcpy(ngc.peerhook, ngc.ourhook, sizeof ngc.peerhook);
    611 
    612     log_Printf(LogDEBUG, "Connecting netgraph socket .:%s -> %s:%s\n",
    613                ngc.ourhook, ngc.path, ngc.peerhook);
    614     if (NgSendMsg(dev->cs, ".:", NGM_GENERIC_COOKIE,
    615                   NGM_CONNECT, &ngc, sizeof ngc) < 0) {
    616       log_Printf(LogWARN, "Cannot connect PPPoE and socket netgraph "
    617                  "nodes: %s\n", strerror(errno));
    618       return ether_Abandon(dev, p);
    619     }
    620 
    621     /* Bring the Ethernet interface up */
    622     path[ifacelen] = '\0';	/* Remove the trailing ':' */
    623     if (!iface_SetFlags(path, IFF_UP))
    624       log_Printf(LogWARN, "%s: Failed to set the IFF_UP flag on %s\n",
    625                  p->link.name, path);
    626 
    627     snprintf(connectpath, sizeof connectpath, ".:%s", dev->hook);
    628 
    629     /* Configure node to 3Com mode if needed */
    630     if (p->cfg.pppoe_configured) {
    631       mode = p->cfg.nonstandard_pppoe ? NG_PPPOE_NONSTANDARD : NG_PPPOE_STANDARD;
    632       if (NgSendMsg(dev->cs, connectpath, NGM_PPPOE_COOKIE,
    633 		NGM_PPPOE_SETMODE, mode, strlen(mode) + 1) == -1) {
    634         log_Printf(LogWARN, "``%s'': Cannot configure netgraph node: %s\n",
    635                  connectpath, strerror(errno));
    636         return ether_Abandon(dev, p);
    637       }
    638     }
    639 
    640     /* And finally, request a connection to the given provider */
    641 
    642     data = (struct ngpppoe_init_data *)alloca(sizeof *data + providerlen);
    643     snprintf(data->hook, sizeof data->hook, "%s", dev->hook);
    644     memcpy(data->data, provider, providerlen);
    645     data->data_len = providerlen;
    646 
    647     log_Printf(LogDEBUG, "Sending PPPOE_CONNECT to %s\n", connectpath);
    648     if (NgSendMsg(dev->cs, connectpath, NGM_PPPOE_COOKIE,
    649                   NGM_PPPOE_CONNECT, data, sizeof *data + providerlen) == -1) {
    650       log_Printf(LogWARN, "``%s'': Cannot start netgraph node: %s\n",
    651                  connectpath, strerror(errno));
    652       return ether_Abandon(dev, p);
    653     }
    654 
    655     /* Hook things up so that we monitor dev->cs */
    656     p->desc.UpdateSet = ether_UpdateSet;
    657     p->desc.IsSet = ether_IsSet;
    658     p->desc.Read = ether_DescriptorRead;
    659 
    660     memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
    661     switch (p->cfg.cd.necessity) {
    662       case CD_VARIABLE:
    663         dev->dev.cd.delay = p->cfg.cd.delay;
    664         break;
    665       case CD_REQUIRED:
    666         dev->dev.cd = p->cfg.cd;
    667         break;
    668       case CD_NOTREQUIRED:
    669         log_Printf(LogWARN, "%s: Carrier must be set, using ``set cd %d!''\n",
    670                    p->link.name, dev->dev.cd.delay);
    671       case CD_DEFAULT:
    672         break;
    673     }
    674 
    675     dev->timeout = dev->dev.cd.delay;
    676     dev->connected = CARRIER_PENDING;
    677     /* This will be overridden by our session id - if provided by netgraph */
    678     dev->slot = GetIfIndex(path);
    679   } else {
    680     /* See if we're a netgraph socket */
    681     struct stat st;
    682 
    683     if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFSOCK)) {
    684       struct sockaddr_storage ssock;
    685       struct sockaddr *sock = (struct sockaddr *)&ssock;
    686       int sz;
    687 
    688       sz = sizeof ssock;
    689       if (getsockname(p->fd, sock, &sz) == -1) {
    690         log_Printf(LogPHASE, "%s: Link is a closed socket !\n", p->link.name);
    691         close(p->fd);
    692         p->fd = -1;
    693         return NULL;
    694       }
    695 
    696       if (sock->sa_family == AF_NETGRAPH) {
    697         /*
    698          * It's a netgraph node... We can't determine hook names etc, so we
    699          * stay pretty impartial....
    700          */
    701         log_Printf(LogPHASE, "%s: Link is a netgraph node\n", p->link.name);
    702 
    703         if ((dev = malloc(sizeof *dev)) == NULL) {
    704           log_Printf(LogWARN, "%s: Cannot allocate an ether device: %s\n",
    705                      p->link.name, strerror(errno));
    706           return NULL;
    707         }
    708 
    709         memcpy(&dev->dev, &baseetherdevice, sizeof dev->dev);
    710         dev->cs = -1;
    711         dev->timeout = 0;
    712         dev->connected = CARRIER_OK;
    713         *dev->hook = '\0';
    714 
    715         /*
    716          * If we're being envoked from pppoed(8), we may have a SESSIONID
    717          * set in the environment.  If so, use it as the slot
    718          */
    719         if ((sessionid = getenv("SESSIONID")) != NULL) {
    720           char *end;
    721           u_long slot;
    722 
    723           slot = strtoul(sessionid, &end, 16);
    724           dev->slot = end != sessionid && *end == '\0' ? slot : 0;
    725         } else
    726           dev->slot = 0;
    727       }
    728     }
    729   }
    730 
    731   if (dev) {
    732     physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
    733     return &dev->dev;
    734   }
    735 
    736   return NULL;
    737 }
    738