openwrt/target/linux/package/switch/src/switch-core.c

   1 /*
   2  * switch-core.c
   3  *
   4  * Copyright (C) 2005 Felix Fietkau <openwrt@nbd.name>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19  *
  20  * $Id: $
  21  *
  22  * Basic doc of driver's /proc interface:
  23  * /proc/switch/<interface>/
  24  *   registers:              read-only
  25  *   counters:               read-only
  26  *   reset:                  write causes hardware reset
  27  *   enable_vlan:            "0", "1"
  28  *   port/<port-number>/
  29  *     enabled:              "0", "1"
  30  *     media:                "AUTO", "100FD", "100HD", "10FD", "10HD"
  31  *   vlan/<port-number>/
  32  *     ports: same syntax as for nvram's vlan*ports (eg. "1 2 3 4 5*")
  33  */
  34
  35 #include <linux/config.h>
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <asm/uaccess.h>
  39 #include <linux/proc_fs.h>
  40 #include <linux/list.h>
  41
  42 #include "switch-core.h"
  43
  44 static int drv_num = 0;
  45 static struct proc_dir_entry *switch_root;
  46 switch_driver drivers;
  47
  48 typedef struct {
  49         struct list_head list;
  50         struct proc_dir_entry *parent;
  51         int nr;
  52         void *driver;
  53         switch_config handler;
  54 } switch_proc_handler;
  55
  56 typedef struct {
  57         struct proc_dir_entry *driver_dir, *port_dir, *vlan_dir;
  58         struct proc_dir_entry **ports, **vlans;
  59         switch_proc_handler data;
  60         int nr;
  61 } switch_priv;
  62
  63 static ssize_t switch_proc_read(struct file *file, char *buf, size_t count, loff_t *ppos);
  64 static ssize_t switch_proc_write(struct file *file, const char *buf, size_t count, void *data);
  65
  66 static struct file_operations switch_proc_fops = {
  67         read: switch_proc_read,
  68         write: switch_proc_write
  69 };
  70
  71 static ssize_t switch_proc_read(struct file *file, char *buf, size_t count, loff_t *ppos)
  72 {
  73 #ifdef LINUX_2_4
  74         struct inode *inode = file->f_dentry->d_inode;
  75         struct proc_dir_entry *dent = inode->u.generic_ip;
  76 #else
  77         struct proc_dir_entry *dent = PDE(file->f_dentry->d_inode);
  78 #endif
  79         char *page;
  80         int len = 0;
  81
  82         if ((page = kmalloc(SWITCH_MAX_BUFSZ, GFP_KERNEL)) == NULL)
  83                 return -ENOBUFS;
  84
  85         if (dent->data != NULL) {
  86                 switch_proc_handler *handler = (switch_proc_handler *) dent->data;
  87                 if (handler->handler.read != NULL)
  88                         len += handler->handler.read(handler->driver, page + len, handler->nr);
  89         }
  90         len += 1;
  91
  92         if (*ppos < len) {
  93                 len = min_t(int, len - *ppos, count);
  94                 if (copy_to_user(buf, (page + *ppos), len)) {
  95                         kfree(page);
  96                         return -EFAULT;
  97                 }
  98                 *ppos += len;
  99         } else {
 100                 len = 0;
 101         }
 102
 103         return len;
 104 }
 105
 106
 107 static ssize_t switch_proc_write(struct file *file, const char *buf, size_t count, void *data)
 108 {
 109 #ifdef LINUX_2_4
 110         struct inode *inode = file->f_dentry->d_inode;
 111         struct proc_dir_entry *dent = inode->u.generic_ip;
 112 #else
 113         struct proc_dir_entry *dent = PDE(file->f_dentry->d_inode);
 114 #endif
 115         char *page;
 116         int ret = -EINVAL;
 117
 118         if ((page = kmalloc(count + 1, GFP_KERNEL)) == NULL)
 119                 return -ENOBUFS;
 120
 121         if (copy_from_user(page, buf, count)) {
 122                 kfree(page);
 123                 return -EINVAL;
 124         }
 125         page[count] = 0;
 126
 127         if (dent->data != NULL) {
 128                 switch_proc_handler *handler = (switch_proc_handler *) dent->data;
 129                 if (handler->handler.write != NULL) {
 130                         if ((ret = handler->handler.write(handler->driver, page, handler->nr)) >= 0)
 131                                 ret = count;
 132                 }
 133         }
 134
 135         kfree(page);
 136         return ret;
 137 }
 138
 139 static int handle_driver_name(void *driver, char *buf, int nr)
 140 {
 141         char *name = ((switch_driver *) driver)->name;
 142         return sprintf(buf, "%s\n", name);
 143 }
 144
 145 static int handle_driver_version(void *driver, char *buf, int nr)
 146 {
 147         char *version = ((switch_driver *) driver)->version;
 148         strcpy(buf, version);
 149         return sprintf(buf, "%s\n", version);
 150 }
 151
 152 static void add_handler(switch_driver *driver, switch_config *handler, struct proc_dir_entry *parent, int nr)
 153 {
 154         switch_priv *priv = (switch_priv *) driver->data;
 155         struct proc_dir_entry *p;
 156         int mode;
 157
 158         switch_proc_handler *tmp;
 159         tmp = (switch_proc_handler *) kmalloc(sizeof(switch_proc_handler), GFP_KERNEL);
 160         INIT_LIST_HEAD(&tmp->list);
 161         tmp->parent = parent;
 162         tmp->nr = nr;
 163         tmp->driver = driver;
 164         memcpy(&tmp->handler, handler, sizeof(switch_config));
 165         list_add(&tmp->list, &priv->data.list);
 166
 167         mode = 0;
 168         if (handler->read != NULL) mode |= S_IRUSR;
 169         if (handler->write != NULL) mode |= S_IWUSR;
 170
 171         if ((p = create_proc_entry(handler->name, mode, parent)) != NULL) {
 172                 p->data = (void *) tmp;
 173                 p->proc_fops = &switch_proc_fops;
 174         }
 175 }
 176
 177 static inline void add_handlers(switch_driver *driver, switch_config *handlers, struct proc_dir_entry *parent, int nr)
 178 {
 179         int i;
 180
 181         for (i = 0; handlers[i].name != NULL; i++) {
 182                 add_handler(driver, &(handlers[i]), parent, nr);
 183         }
 184 }
 185
 186 static void remove_handlers(switch_priv *priv)
 187 {
 188         struct list_head *pos, *q;
 189         switch_proc_handler *tmp;
 190
 191         list_for_each_safe(pos, q, &priv->data.list) {
 192                 tmp = list_entry(pos, switch_proc_handler, list);
 193                 list_del(pos);
 194                 remove_proc_entry(tmp->handler.name, tmp->parent);
 195                 kfree(tmp);
 196         }
 197 }
 198
 199
 200 static void do_unregister(switch_driver *driver)
 201 {
 202         char buf[4];
 203         int i;
 204         switch_priv *priv = (switch_priv *) driver->data;
 205
 206         remove_handlers(priv);
 207
 208         for(i = 0; priv->ports[i] != NULL; i++) {
 209                 sprintf(buf, "%d", i);
 210                 remove_proc_entry(buf, priv->port_dir);
 211         }
 212         kfree(priv->ports);
 213         remove_proc_entry("port", priv->driver_dir);
 214
 215         for(i = 0; priv->vlans[i] != NULL; i++) {
 216                 sprintf(buf, "%d", i);
 217                 remove_proc_entry(buf, priv->vlan_dir);
 218         }
 219         kfree(priv->vlans);
 220         remove_proc_entry("vlan", priv->driver_dir);
 221
 222         remove_proc_entry(driver->interface, switch_root);
 223
 224         if (priv->nr == (drv_num - 1))
 225                 drv_num--;
 226
 227         kfree(priv);
 228 }
 229
 230 switch_config global_driver_handlers[] = {
 231         {"driver", handle_driver_name, NULL},
 232         {"version", handle_driver_version, NULL},
 233         {NULL, NULL, NULL}
 234 };
 235
 236 static int do_register(switch_driver *driver)
 237 {
 238         switch_priv *priv;
 239         int i;
 240         char buf[4];
 241
 242         if ((priv = kmalloc(sizeof(switch_priv), GFP_KERNEL)) == NULL)
 243                 return -ENOBUFS;
 244         driver->data = (void *) priv;
 245
 246         INIT_LIST_HEAD(&priv->data.list);
 247
 248         priv->nr = drv_num++;
 249         priv->driver_dir = proc_mkdir(driver->interface, switch_root);
 250         if (driver->driver_handlers != NULL) {
 251                 add_handlers(driver, driver->driver_handlers, priv->driver_dir, 0);
 252                 add_handlers(driver, global_driver_handlers, priv->driver_dir, 0);
 253         }
 254
 255         priv->port_dir = proc_mkdir("port", priv->driver_dir);
 256         priv->ports = kmalloc((driver->ports + 1) * sizeof(struct proc_dir_entry *), GFP_KERNEL);
 257         for (i = 0; i < driver->ports; i++) {
 258                 sprintf(buf, "%d", i);
 259                 priv->ports[i] = proc_mkdir(buf, priv->port_dir);
 260                 if (driver->port_handlers != NULL)
 261                         add_handlers(driver, driver->port_handlers, priv->ports[i], i);
 262         }
 263         priv->ports[i] = NULL;
 264
 265         priv->vlan_dir = proc_mkdir("vlan", priv->driver_dir);
 266         priv->vlans = kmalloc((driver->vlans + 1) * sizeof(struct proc_dir_entry *), GFP_KERNEL);
 267         for (i = 0; i < driver->vlans; i++) {
 268                 sprintf(buf, "%d", i);
 269                 priv->vlans[i] = proc_mkdir(buf, priv->vlan_dir);
 270                 if (driver->vlan_handlers != NULL)
 271                         add_handlers(driver, driver->vlan_handlers, priv->vlans[i], i);
 272         }
 273         priv->vlans[i] = NULL;
 274
 275
 276         return 0;
 277 }
 278
 279 static inline int isspace(char c) {
 280         switch(c) {
 281                 case ' ':
 282                 case 0x09:
 283                 case 0x0a:
 284                 case 0x0d:
 285                         return 1;
 286                 default:
 287                         return 0;
 288         }
 289 }
 290
 291 #define toupper(c) (islower(c) ? ((c) ^ 0x20) : (c))
 292 #define islower(c) (((unsigned char)((c) - 'a')) < 26)
 293
 294 int switch_parse_media(char *buf)
 295 {
 296         char *str = buf;
 297         while (*buf != 0) {
 298                 *buf = toupper(*buf);
 299                 buf++;
 300         }
 301
 302         if (strncmp(str, "AUTO", 4) == 0)
 303                 return SWITCH_MEDIA_AUTO;
 304         else if (strncmp(str, "100FD", 5) == 0)
 305                 return SWITCH_MEDIA_100 | SWITCH_MEDIA_FD;
 306         else if (strncmp(str, "100HD", 5) == 0)
 307                 return SWITCH_MEDIA_100;
 308         else if (strncmp(str, "10FD", 4) == 0)
 309                 return SWITCH_MEDIA_FD;
 310         else if (strncmp(str, "10HD", 4) == 0)
 311                 return 0;
 312         else return -1;
 313 }
 314
 315 int switch_print_media(char *buf, int media)
 316 {
 317         int len = 0;
 318
 319         if (media & SWITCH_MEDIA_AUTO)
 320                 len = sprintf(buf, "Auto");
 321         else if (media == (SWITCH_MEDIA_100 | SWITCH_MEDIA_FD))
 322                 len = sprintf(buf, "100FD");
 323         else if (media == SWITCH_MEDIA_100)
 324                 len = sprintf(buf,  "100HD");
 325         else if (media == SWITCH_MEDIA_FD)
 326                 len = sprintf(buf,  "10FD");
 327         else if (media == 0)
 328                 len = sprintf(buf,  "10HD");
 329         else
 330                 len = sprintf(buf, "Invalid");
 331
 332         return len;
 333 }
 334
 335 switch_vlan_config *switch_parse_vlan(switch_driver *driver, char *buf)
 336 {
 337         switch_vlan_config *c;
 338         int j, u, p, s;
 339
 340         c = kmalloc(sizeof(switch_vlan_config), GFP_KERNEL);
 341         memset(c, 0, sizeof(switch_vlan_config));
 342
 343         while (isspace(*buf)) buf++;
 344         j = 0;
 345         while (*buf >= '0' && *buf <= '9') {
 346                 j *= 10;
 347                 j += *buf++ - '0';
 348
 349                 u = ((j == driver->cpuport) ? 0 : 1);
 350                 p = 0;
 351                 s = !(*buf >= '0' && *buf <= '9');
 352
 353                 if (s) {
 354                         while (s && !isspace(*buf) && (*buf != 0)) {
 355                                 switch(*buf) {
 356                                         case 'u':
 357                                                 u = 1;
 358                                                 break;
 359                                         case 't':
 360                                                 u = 0;
 361                                                 break;
 362                                         case '*':
 363                                                 p = 1;
 364                                                 break;
 365                                 }
 366                                 buf++;
 367                         }
 368                         c->port |= (1 << j);
 369                         if (u)
 370                                 c->untag |= (1 << j);
 371                         if (p)
 372                                 c->pvid |= (1 << j);
 373
 374                         j = 0;
 375                 }
 376
 377                 while (isspace(*buf)) buf++;
 378         }
 379         if (*buf != 0) return NULL;
 380
 381         c->port &= (1 << driver->ports) - 1;
 382         c->untag &= (1 << driver->ports) - 1;
 383         c->pvid &= (1 << driver->ports) - 1;
 384
 385         return c;
 386 }
 387
 388
 389 int switch_register_driver(switch_driver *driver)
 390 {
 391         struct list_head *pos;
 392         switch_driver *new;
 393         int ret;
 394
 395         list_for_each(pos, &drivers.list) {
 396                 if (strcmp(list_entry(pos, switch_driver, list)->name, driver->name) == 0) {
 397                         printk("Switch driver '%s' already exists in the kernel\n", driver->name);
 398                         return -EINVAL;
 399                 }
 400                 if (strcmp(list_entry(pos, switch_driver, list)->interface, driver->interface) == 0) {
 401                         printk("There is already a switch registered on the device '%s'\n", driver->interface);
 402                         return -EINVAL;
 403                 }
 404         }
 405
 406         new = kmalloc(sizeof(switch_driver), GFP_KERNEL);
 407         memcpy(new, driver, sizeof(switch_driver));
 408         new->name = strdup(driver->name);
 409         new->interface = strdup(driver->interface);
 410
 411         if ((ret = do_register(new)) < 0) {
 412                 kfree(new->name);
 413                 kfree(new);
 414                 return ret;
 415         }
 416         INIT_LIST_HEAD(&new->list);
 417         list_add(&new->list, &drivers.list);
 418
 419         return 0;
 420 }
 421
 422 void switch_unregister_driver(char *name) {
 423         struct list_head *pos, *q;
 424         switch_driver *tmp;
 425
 426         list_for_each_safe(pos, q, &drivers.list) {
 427                 tmp = list_entry(pos, switch_driver, list);
 428                 if (strcmp(tmp->name, name) == 0) {
 429                         do_unregister(tmp);
 430                         list_del(pos);
 431                         kfree(tmp->name);
 432                         kfree(tmp);
 433
 434                         return;
 435                 }
 436         }
 437 }
 438
 439 static int __init switch_init()
 440 {
 441         if ((switch_root = proc_mkdir("switch", NULL)) == NULL) {
 442                 printk("%s: proc_mkdir failed.\n", __FILE__);
 443                 return -ENODEV;
 444         }
 445
 446         INIT_LIST_HEAD(&drivers.list);
 447
 448         return 0;
 449 }
 450
 451 static void __exit switch_exit()
 452 {
 453         remove_proc_entry("switch", NULL);
 454 }
 455
 456 MODULE_AUTHOR("Felix Fietkau <openwrt@nbd.name>");
 457 MODULE_LICENSE("GPL");
 458
 459 EXPORT_SYMBOL(switch_register_driver);
 460 EXPORT_SYMBOL(switch_unregister_driver);
 461 EXPORT_SYMBOL(switch_parse_vlan);
 462 EXPORT_SYMBOL(switch_parse_media);
 463 EXPORT_SYMBOL(switch_print_media);
 464
 465 module_init(switch_init);
 466 module_exit(switch_exit);