net/wanrouter/wanproc.c

   1 /*****************************************************************************
   2 * wanproc.c     WAN Router Module. /proc filesystem interface.
   3 *
   4 *               This module is completely hardware-independent and provides
   5 *               access to the router using Linux /proc filesystem.
   6 *
   7 * Author:       Gideon Hack
   8 *
   9 * Copyright:    (c) 1995-1999 Sangoma Technologies Inc.
  10 *
  11 *               This program is free software; you can redistribute it and/or
  12 *               modify it under the terms of the GNU General Public License
  13 *               as published by the Free Software Foundation; either version
  14 *               2 of the License, or (at your option) any later version.
  15 * ============================================================================
  16 * Jun 02, 1999  Gideon Hack     Updates for Linux 2.2.X kernels.
  17 * Jun 29, 1997  Alan Cox        Merged with 1.0.3 vendor code
  18 * Jan 29, 1997  Gene Kozin      v1.0.1. Implemented /proc read routines
  19 * Jan 30, 1997  Alan Cox        Hacked around for 2.1
  20 * Dec 13, 1996  Gene Kozin      Initial version (based on Sangoma's WANPIPE)
  21 *****************************************************************************/
  22
  23 #include <linux/init.h>         /* __initfunc et al. */
  24 #include <linux/stddef.h>       /* offsetof(), etc. */
  25 #include <linux/errno.h>        /* return codes */
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/wanrouter.h>    /* WAN router API definitions */
  29 #include <linux/seq_file.h>
  30 #include <linux/smp_lock.h>
  31
  32 #include <net/net_namespace.h>
  33 #include <asm/io.h>
  34
  35 #define PROC_STATS_FORMAT "%30s: %12lu\n"
  36
  37 /****** Defines and Macros **************************************************/
  38
  39 #define PROT_DECODE(prot) ((prot == WANCONFIG_FR) ? " FR" :\
  40                               (prot == WANCONFIG_X25) ? " X25" : \
  41                                  (prot == WANCONFIG_PPP) ? " PPP" : \
  42                                     (prot == WANCONFIG_CHDLC) ? " CHDLC": \
  43                                        (prot == WANCONFIG_MPPP) ? " MPPP" : \
  44                                            " Unknown" )
  45
  46 /****** Function Prototypes *************************************************/
  47
  48 #ifdef CONFIG_PROC_FS
  49
  50 /* Miscellaneous */
  51
  52 /*
  53  *      Structures for interfacing with the /proc filesystem.
  54  *      Router creates its own directory /proc/net/router with the folowing
  55  *      entries:
  56  *      config          device configuration
  57  *      status          global device statistics
  58  *      <device>        entry for each WAN device
  59  */
  60
  61 /*
  62  *      Generic /proc/net/router/<file> file and inode operations
  63  */
  64
  65 /*
  66  *      /proc/net/router
  67  */
  68
  69 static struct proc_dir_entry *proc_router;
  70
  71 /* Strings */
  72
  73 /*
  74  *      Interface functions
  75  */
  76
  77 /****** Proc filesystem entry points ****************************************/
  78
  79 /*
  80  *      Iterator
  81  */
  82 static void *r_start(struct seq_file *m, loff_t *pos)
  83 {
  84         struct wan_device *wandev;
  85         loff_t l = *pos;
  86
  87         lock_kernel();
  88         if (!l--)
  89                 return SEQ_START_TOKEN;
  90         for (wandev = wanrouter_router_devlist; l-- && wandev;
  91              wandev = wandev->next)
  92                 ;
  93         return wandev;
  94 }
  95
  96 static void *r_next(struct seq_file *m, void *v, loff_t *pos)
  97 {
  98         struct wan_device *wandev = v;
  99         (*pos)++;
 100         return (v == SEQ_START_TOKEN) ? wanrouter_router_devlist : wandev->next;
 101 }
 102
 103 static void r_stop(struct seq_file *m, void *v)
 104 {
 105         unlock_kernel();
 106 }
 107
 108 static int config_show(struct seq_file *m, void *v)
 109 {
 110         struct wan_device *p = v;
 111         if (v == SEQ_START_TOKEN) {
 112                 seq_puts(m, "Device name    | port |IRQ|DMA|  mem.addr  |"
 113                             "mem.size|option1|option2|option3|option4\n");
 114                 return 0;
 115         }
 116         if (!p->state)
 117                 return 0;
 118         seq_printf(m, "%-15s|0x%-4X|%3u|%3u| 0x%-8lX |0x%-6X|%7u|%7u|%7u|%7u\n",
 119                         p->name, p->ioport, p->irq, p->dma, p->maddr, p->msize,
 120                         p->hw_opt[0], p->hw_opt[1], p->hw_opt[2], p->hw_opt[3]);
 121         return 0;
 122 }
 123
 124 static int status_show(struct seq_file *m, void *v)
 125 {
 126         struct wan_device *p = v;
 127         if (v == SEQ_START_TOKEN) {
 128                 seq_puts(m, "Device name    |protocol|station|interface|"
 129                             "clocking|baud rate| MTU |ndev|link state\n");
 130                 return 0;
 131         }
 132         if (!p->state)
 133                 return 0;
 134         seq_printf(m, "%-15s|%-8s| %-7s| %-9s|%-8s|%9u|%5u|%3u |",
 135                 p->name,
 136                 PROT_DECODE(p->config_id),
 137                 p->config_id == WANCONFIG_FR ?
 138                         (p->station ? "Node" : "CPE") :
 139                         (p->config_id == WANCONFIG_X25 ?
 140                         (p->station ? "DCE" : "DTE") :
 141                         ("N/A")),
 142                 p->interface ? "V.35" : "RS-232",
 143                 p->clocking ? "internal" : "external",
 144                 p->bps,
 145                 p->mtu,
 146                 p->ndev);
 147
 148         switch (p->state) {
 149         case WAN_UNCONFIGURED:
 150                 seq_printf(m, "%-12s\n", "unconfigured");
 151                 break;
 152         case WAN_DISCONNECTED:
 153                 seq_printf(m, "%-12s\n", "disconnected");
 154                 break;
 155         case WAN_CONNECTING:
 156                 seq_printf(m, "%-12s\n", "connecting");
 157                 break;
 158         case WAN_CONNECTED:
 159                 seq_printf(m, "%-12s\n", "connected");
 160                 break;
 161         default:
 162                 seq_printf(m, "%-12s\n", "invalid");
 163                 break;
 164         }
 165         return 0;
 166 }
 167
 168 static const struct seq_operations config_op = {
 169         .start  = r_start,
 170         .next   = r_next,
 171         .stop   = r_stop,
 172         .show   = config_show,
 173 };
 174
 175 static const struct seq_operations status_op = {
 176         .start  = r_start,
 177         .next   = r_next,
 178         .stop   = r_stop,
 179         .show   = status_show,
 180 };
 181
 182 static int config_open(struct inode *inode, struct file *file)
 183 {
 184         return seq_open(file, &config_op);
 185 }
 186
 187 static int status_open(struct inode *inode, struct file *file)
 188 {
 189         return seq_open(file, &status_op);
 190 }
 191
 192 static const struct file_operations config_fops = {
 193         .owner   = THIS_MODULE,
 194         .open    = config_open,
 195         .read    = seq_read,
 196         .llseek  = seq_lseek,
 197         .release = seq_release,
 198 };
 199
 200 static const struct file_operations status_fops = {
 201         .owner   = THIS_MODULE,
 202         .open    = status_open,
 203         .read    = seq_read,
 204         .llseek  = seq_lseek,
 205         .release = seq_release,
 206 };
 207
 208 static int wandev_show(struct seq_file *m, void *v)
 209 {
 210         struct wan_device *wandev = m->private;
 211
 212         if (wandev->magic != ROUTER_MAGIC)
 213                 return 0;
 214
 215         if (!wandev->state) {
 216                 seq_puts(m, "device is not configured!\n");
 217                 return 0;
 218         }
 219
 220         /* Update device statistics */
 221         if (wandev->update) {
 222                 int err = wandev->update(wandev);
 223                 if (err == -EAGAIN) {
 224                         seq_puts(m, "Device is busy!\n");
 225                         return 0;
 226                 }
 227                 if (err) {
 228                         seq_puts(m, "Device is not configured!\n");
 229                         return 0;
 230                 }
 231         }
 232
 233         seq_printf(m, PROC_STATS_FORMAT,
 234                 "total packets received", wandev->stats.rx_packets);
 235         seq_printf(m, PROC_STATS_FORMAT,
 236                 "total packets transmitted", wandev->stats.tx_packets);
 237         seq_printf(m, PROC_STATS_FORMAT,
 238                 "total bytes received", wandev->stats.rx_bytes);
 239         seq_printf(m, PROC_STATS_FORMAT,
 240                 "total bytes transmitted", wandev->stats.tx_bytes);
 241         seq_printf(m, PROC_STATS_FORMAT,
 242                 "bad packets received", wandev->stats.rx_errors);
 243         seq_printf(m, PROC_STATS_FORMAT,
 244                 "packet transmit problems", wandev->stats.tx_errors);
 245         seq_printf(m, PROC_STATS_FORMAT,
 246                 "received frames dropped", wandev->stats.rx_dropped);
 247         seq_printf(m, PROC_STATS_FORMAT,
 248                 "transmit frames dropped", wandev->stats.tx_dropped);
 249         seq_printf(m, PROC_STATS_FORMAT,
 250                 "multicast packets received", wandev->stats.multicast);
 251         seq_printf(m, PROC_STATS_FORMAT,
 252                 "transmit collisions", wandev->stats.collisions);
 253         seq_printf(m, PROC_STATS_FORMAT,
 254                 "receive length errors", wandev->stats.rx_length_errors);
 255         seq_printf(m, PROC_STATS_FORMAT,
 256                 "receiver overrun errors", wandev->stats.rx_over_errors);
 257         seq_printf(m, PROC_STATS_FORMAT,
 258                 "CRC errors", wandev->stats.rx_crc_errors);
 259         seq_printf(m, PROC_STATS_FORMAT,
 260                 "frame format errors (aborts)", wandev->stats.rx_frame_errors);
 261         seq_printf(m, PROC_STATS_FORMAT,
 262                 "receiver fifo overrun", wandev->stats.rx_fifo_errors);
 263         seq_printf(m, PROC_STATS_FORMAT,
 264                 "receiver missed packet", wandev->stats.rx_missed_errors);
 265         seq_printf(m, PROC_STATS_FORMAT,
 266                 "aborted frames transmitted", wandev->stats.tx_aborted_errors);
 267         return 0;
 268 }
 269
 270 static int wandev_open(struct inode *inode, struct file *file)
 271 {
 272         return single_open(file, wandev_show, PDE(inode)->data);
 273 }
 274
 275 static const struct file_operations wandev_fops = {
 276         .owner   = THIS_MODULE,
 277         .open    = wandev_open,
 278         .read    = seq_read,
 279         .llseek  = seq_lseek,
 280         .release = single_release,
 281         .ioctl   = wanrouter_ioctl,
 282 };
 283
 284 /*
 285  *      Initialize router proc interface.
 286  */
 287
 288 int __init wanrouter_proc_init(void)
 289 {
 290         struct proc_dir_entry *p;
 291         proc_router = proc_mkdir(ROUTER_NAME, init_net.proc_net);
 292         if (!proc_router)
 293                 goto fail;
 294
 295         p = create_proc_entry("config", S_IRUGO, proc_router);
 296         if (!p)
 297                 goto fail_config;
 298         p->proc_fops = &config_fops;
 299         p = create_proc_entry("status", S_IRUGO, proc_router);
 300         if (!p)
 301                 goto fail_stat;
 302         p->proc_fops = &status_fops;
 303         return 0;
 304 fail_stat:
 305         remove_proc_entry("config", proc_router);
 306 fail_config:
 307         remove_proc_entry(ROUTER_NAME, init_net.proc_net);
 308 fail:
 309         return -ENOMEM;
 310 }
 311
 312 /*
 313  *      Clean up router proc interface.
 314  */
 315
 316 void wanrouter_proc_cleanup(void)
 317 {
 318         remove_proc_entry("config", proc_router);
 319         remove_proc_entry("status", proc_router);
 320         remove_proc_entry(ROUTER_NAME, init_net.proc_net);
 321 }
 322
 323 /*
 324  *      Add directory entry for WAN device.
 325  */
 326
 327 int wanrouter_proc_add(struct wan_device* wandev)
 328 {
 329         if (wandev->magic != ROUTER_MAGIC)
 330                 return -EINVAL;
 331
 332         wandev->dent = create_proc_entry(wandev->name, S_IRUGO, proc_router);
 333         if (!wandev->dent)
 334                 return -ENOMEM;
 335         wandev->dent->proc_fops = &wandev_fops;
 336         wandev->dent->data      = wandev;
 337         return 0;
 338 }
 339
 340 /*
 341  *      Delete directory entry for WAN device.
 342  */
 343 int wanrouter_proc_delete(struct wan_device* wandev)
 344 {
 345         if (wandev->magic != ROUTER_MAGIC)
 346                 return -EINVAL;
 347         remove_proc_entry(wandev->name, proc_router);
 348         return 0;
 349 }
 350
 351 #else
 352
 353 /*
 354  *      No /proc - output stubs
 355  */
 356
 357 int __init wanrouter_proc_init(void)
 358 {
 359         return 0;
 360 }
 361
 362 void wanrouter_proc_cleanup(void)
 363 {
 364 }
 365
 366 int wanrouter_proc_add(struct wan_device *wandev)
 367 {
 368         return 0;
 369 }
 370
 371 int wanrouter_proc_delete(struct wan_device *wandev)
 372 {
 373         return 0;
 374 }
 375
 376 #endif
 377
 378 /*
 379  *      End
 380  */
 381