usr.sbin/ppp/atm.c

   1 /*-
   2  * Copyright (c) 2000 Jakob Stoklund Olesen <stoklund@taxidriver.dk>
   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/atm.c,v 1.9.2.1 2002/09/01 02:12:22 brian Exp $
  27  * $DragonFly: src/usr.sbin/ppp/atm.c,v 1.2 2003/06/17 04:30:00 dillon Exp $
  28  */
  29
  30 #include <sys/types.h>
  31 #include <sys/socket.h>
  32 #include <net/if.h>
  33 #include <netnatm/natm.h>
  34
  35 #include <errno.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <sysexits.h>
  40 #include <sys/uio.h>
  41 #include <termios.h>
  42 #include <unistd.h>
  43
  44 #include "layer.h"
  45 #include "defs.h"
  46 #include "mbuf.h"
  47 #include "log.h"
  48 #include "timer.h"
  49 #include "lqr.h"
  50 #include "hdlc.h"
  51 #include "throughput.h"
  52 #include "fsm.h"
  53 #include "lcp.h"
  54 #include "ccp.h"
  55 #include "link.h"
  56 #include "async.h"
  57 #include "descriptor.h"
  58 #include "physical.h"
  59 #include "main.h"
  60 #include "atm.h"
  61
  62 /* String identifying PPPoA */
  63 #define PPPOA           "PPPoA"
  64 #define PPPOA_LEN       (sizeof(PPPOA) - 1)
  65
  66 struct atmdevice {
  67   struct device dev;            /* What struct physical knows about */
  68 };
  69
  70 #define device2atm(d) ((d)->type == ATM_DEVICE ? (struct atmdevice *)d : NULL)
  71
  72 int
  73 atm_DeviceSize(void)
  74 {
  75   return sizeof(struct atmdevice);
  76 }
  77
  78 static ssize_t
  79 atm_Sendto(struct physical *p, const void *v, size_t n)
  80 {
  81   ssize_t ret = write(p->fd, v, n);
  82   if (ret < 0) {
  83     log_Printf(LogDEBUG, "atm_Sendto(%ld): %s\n", (long)n, strerror(errno));
  84     return ret;
  85   }
  86   return ret;
  87 }
  88
  89 static ssize_t
  90 atm_Recvfrom(struct physical *p, void *v, size_t n)
  91 {
  92     ssize_t ret = read(p->fd, (char*)v, n);
  93     if (ret < 0) {
  94       log_Printf(LogDEBUG, "atm_Recvfrom(%ld): %s\n", (long)n, strerror(errno));
  95       return ret;
  96     }
  97     return ret;
  98 }
  99
 100 static void
 101 atm_Free(struct physical *p)
 102 {
 103   struct atmdevice *dev = device2atm(p->handler);
 104
 105   free(dev);
 106 }
 107
 108 static void
 109 atm_device2iov(struct device *d, struct iovec *iov, int *niov,
 110                int maxiov, int *auxfd, int *nauxfd)
 111 {
 112   int sz = physical_MaxDeviceSize();
 113
 114   iov[*niov].iov_base = realloc(d, sz);
 115   if (iov[*niov].iov_base == NULL) {
 116     log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz);
 117     AbortProgram(EX_OSERR);
 118   }
 119   iov[*niov].iov_len = sz;
 120   (*niov)++;
 121 }
 122
 123 static const struct device baseatmdevice = {
 124   ATM_DEVICE,
 125   "atm",
 126   0,
 127   { CD_NOTREQUIRED, 0 },
 128   NULL,
 129   NULL,
 130   NULL,
 131   NULL,
 132   NULL,
 133   NULL,
 134   NULL,
 135   atm_Free,
 136   atm_Recvfrom,
 137   atm_Sendto,
 138   atm_device2iov,
 139   NULL,
 140   NULL,
 141   NULL
 142 };
 143
 144 struct device *
 145 atm_iov2device(int type, struct physical *p, struct iovec *iov, int *niov,
 146                int maxiov, int *auxfd, int *nauxfd)
 147 {
 148   if (type == ATM_DEVICE) {
 149     struct atmdevice *dev = (struct atmdevice *)iov[(*niov)++].iov_base;
 150
 151     dev = realloc(dev, sizeof *dev);    /* Reduce to the correct size */
 152     if (dev == NULL) {
 153       log_Printf(LogALERT, "Failed to allocate memory: %d\n",
 154                  (int)(sizeof *dev));
 155       AbortProgram(EX_OSERR);
 156     }
 157
 158     /* Refresh function pointers etc */
 159     memcpy(&dev->dev, &baseatmdevice, sizeof dev->dev);
 160
 161     physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
 162     return &dev->dev;
 163   }
 164
 165   return NULL;
 166 }
 167
 168 static struct atmdevice *
 169 atm_CreateDevice(struct physical *p, const char *iface, unsigned vpi,
 170                  unsigned vci)
 171 {
 172   struct atmdevice *dev;
 173   struct sockaddr_natm sock;
 174
 175   if ((dev = calloc(1, sizeof *dev)) == NULL) {
 176     log_Printf(LogWARN, "%s: Cannot allocate an atm device: %s\n",
 177                p->link.name, strerror(errno));
 178     return NULL;
 179   }
 180
 181   sock.snatm_len = sizeof sock;
 182   sock.snatm_family = AF_NATM;
 183   strncpy(sock.snatm_if, iface, IFNAMSIZ);
 184   sock.snatm_vpi = vpi;
 185   sock.snatm_vci = vci;
 186
 187   log_Printf(LogPHASE, "%s: Connecting to %s:%u.%u\n", p->link.name,
 188              iface, vpi, vci);
 189
 190   p->fd = socket(PF_NATM, SOCK_DGRAM, PROTO_NATMAAL5);
 191   if (p->fd >= 0) {
 192     log_Printf(LogDEBUG, "%s: Opened atm socket %s\n", p->link.name,
 193                p->name.full);
 194     if (connect(p->fd, (struct sockaddr *)&sock, sizeof sock) == 0)
 195       return dev;
 196     else
 197       log_Printf(LogWARN, "%s: connect: %s\n", p->name.full, strerror(errno));
 198   } else
 199     log_Printf(LogWARN, "%s: socket: %s\n", p->name.full, strerror(errno));
 200
 201   close(p->fd);
 202   p->fd = -1;
 203   free(dev);
 204
 205   return NULL;
 206 }
 207
 208 struct device *
 209 atm_Create(struct physical *p)
 210 {
 211   struct atmdevice *dev;
 212
 213   dev = NULL;
 214   if (p->fd < 0 && !strncasecmp(p->name.full, PPPOA, PPPOA_LEN)
 215       && p->name.full[PPPOA_LEN] == ':') {
 216     char iface[25];
 217     unsigned vci, vpi;
 218
 219     if (sscanf(p->name.full + PPPOA_LEN + 1, "%25[A-Za-z0-9]:%u.%u", iface,
 220                &vpi, &vci) != 3) {
 221       log_Printf(LogWARN, "Malformed ATM device name \'%s\', "
 222                  "PPPoA:if:vpi.vci expected\n", p->name.full);
 223       return NULL;
 224     }
 225
 226     dev = atm_CreateDevice(p, iface, vpi, vci);
 227   }
 228
 229   if (dev) {
 230     memcpy(&dev->dev, &baseatmdevice, sizeof dev->dev);
 231     physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
 232     if (p->cfg.cd.necessity != CD_DEFAULT)
 233       log_Printf(LogWARN, "Carrier settings ignored\n");
 234     return &dev->dev;
 235   }
 236
 237   return NULL;
 238 }