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