atm.c revision 71781 
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: head/usr.sbin/ppp/atm.c 71781 2001-01-29 08:46:58Z brian $
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
65struct 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
71int
72atm_DeviceSize(void)
73{
74  return sizeof(struct atmdevice);
75}
76
77static ssize_t
78atm_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
88static ssize_t
89atm_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
99static void
100atm_Free(struct physical *p)
101{
102  struct atmdevice *dev = device2atm(p->handler);
103
104  free(dev);
105}
106
107static void
108atm_device2iov(struct device *d, struct iovec *iov, int *niov,
109               int maxiov, int *auxfd, int *nauxfd)
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
122static const struct device baseatmdevice = {
123  ATM_DEVICE,
124  "atm",
125  { CD_NOTREQUIRED, 0 },
126  NULL,
127  NULL,
128  NULL,
129  NULL,
130  NULL,
131  NULL,
132  atm_Free,
133  atm_Recvfrom,
134  atm_Sendto,
135  atm_device2iov,
136  NULL,
137  NULL
138};
139
140struct device *
141atm_iov2device(int type, struct physical *p, struct iovec *iov, int *niov,
142               int maxiov, int *auxfd, int *nauxfd)
143{
144  if (type == ATM_DEVICE) {
145    struct atmdevice *dev = (struct atmdevice *)iov[(*niov)++].iov_base;
146
147    dev = realloc(dev, sizeof *dev);	/* Reduce to the correct size */
148    if (dev == NULL) {
149      log_Printf(LogALERT, "Failed to allocate memory: %d\n",
150                 (int)(sizeof *dev));
151      AbortProgram(EX_OSERR);
152    }
153
154    /* Refresh function pointers etc */
155    memcpy(&dev->dev, &baseatmdevice, sizeof dev->dev);
156
157    physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
158    return &dev->dev;
159  }
160
161  return NULL;
162}
163
164static struct atmdevice *
165atm_CreateDevice(struct physical *p, const char *iface, unsigned vpi,
166                 unsigned vci)
167{
168  struct atmdevice *dev;
169  struct sockaddr_natm sock;
170
171  if ((dev = calloc(1, sizeof *dev)) == NULL) {
172    log_Printf(LogWARN, "%s: Cannot allocate an atm device: %s\n",
173               p->link.name, strerror(errno));
174    return NULL;
175  }
176
177  sock.snatm_len = sizeof sock;
178  sock.snatm_family = AF_NATM;
179  strncpy(sock.snatm_if, iface, IFNAMSIZ);
180  sock.snatm_vpi = vpi;
181  sock.snatm_vci = vci;
182
183  log_Printf(LogPHASE, "%s: Connecting to %s:%u.%u\n", p->link.name,
184             iface, vpi, vci);
185
186  p->fd = socket(PF_NATM, SOCK_DGRAM, PROTO_NATMAAL5);
187  if (p->fd >= 0) {
188    log_Printf(LogDEBUG, "%s: Opened atm socket %s\n", p->link.name,
189               p->name.full);
190    if (connect(p->fd, (struct sockaddr *)&sock, sizeof sock) == 0)
191      return dev;
192    else
193      log_Printf(LogWARN, "%s: connect: %s\n", p->name.full, strerror(errno));
194  } else
195    log_Printf(LogWARN, "%s: socket: %s\n", p->name.full, strerror(errno));
196
197  close(p->fd);
198  p->fd = -1;
199  free(dev);
200
201  return NULL;
202}
203
204struct device *
205atm_Create(struct physical *p)
206{
207  struct atmdevice *dev;
208
209  dev = NULL;
210  if (p->fd < 0 && !strncasecmp(p->name.full, PPPOA, PPPOA_LEN)
211      && p->name.full[PPPOA_LEN] == ':') {
212    char iface[25];
213    unsigned vci, vpi;
214
215    if (sscanf(p->name.full + PPPOA_LEN + 1, "%25[A-Za-z0-9]:%u.%u", iface,
216               &vpi, &vci) != 3) {
217      log_Printf(LogWARN, "Malformed ATM device name \'%s\', "
218                 "PPPoA:if:vpi.vci expected\n", p->name.full);
219      return NULL;
220    }
221
222    dev = atm_CreateDevice(p, iface, vpi, vci);
223  }
224
225  if (dev) {
226    memcpy(&dev->dev, &baseatmdevice, sizeof dev->dev);
227    physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNCNOACF);
228    if (p->cfg.cd.necessity != CD_DEFAULT)
229      log_Printf(LogWARN, "Carrier settings ignored\n");
230    return &dev->dev;
231  }
232
233  return NULL;
234}
235