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/autoconf.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 = (ssize_t (*) (struct file *, char __user *, size_t, loff_t *))switch_proc_read,
  68         .write = (ssize_t (*) (struct file *, const char __user *, size_t, loff_t *))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         kfree(page);
 104         return len;
 105 }
 106
 107
 108 static ssize_t switch_proc_write(struct file *file, const char *buf, size_t count, void *data)
 109 {
 110 #ifdef LINUX_2_4
 111         struct inode *inode = file->f_dentry->d_inode;
 112         struct proc_dir_entry *dent = inode->u.generic_ip;
 113 #else
 114         struct proc_dir_entry *dent = PDE(file->f_dentry->d_inode);
 115 #endif
 116         char *page;
 117         int ret = -EINVAL;
 118
 119         if ((page = kmalloc(count + 1, GFP_KERNEL)) == NULL)
 120                 return -ENOBUFS;
 121
 122         if (copy_from_user(page, buf, count)) {
 123                 kfree(page);
 124                 return -EINVAL;
 125         }
 126         page[count] = 0;
 127
 128         if (dent->data != NULL) {
 129                 switch_proc_handler *handler = (switch_proc_handler *) dent->data;
 130                 if (handler->handler.write != NULL) {
 131                         if ((ret = handler->handler.write(handler->driver, page, handler->nr)) >= 0)
 132                                 ret = count;
 133                 }
 134         }
 135
 136         kfree(page);
 137         return ret;
 138 }
 139
 140 static int handle_driver_name(void *driver, char *buf, int nr)
 141 {
 142         char *name = ((switch_driver *) driver)->name;
 143         return sprintf(buf, "%s\n", name);
 144 }
 145
 146 static int handle_driver_version(void *driver, char *buf, int nr)
 147 {
 148         char *version = ((switch_driver *) driver)->version;
 149         strcpy(buf, version);
 150         return sprintf(buf, "%s\n", version);
 151 }
 152
 153 static void add_handler(switch_driver *driver, switch_config *handler, struct proc_dir_entry *parent, int nr)
 154 {
 155         switch_priv *priv = (switch_priv *) driver->data;
 156         struct proc_dir_entry *p;
 157         int mode;
 158
 159         switch_proc_handler *tmp;
 160         tmp = (switch_proc_handler *) kmalloc(sizeof(switch_proc_handler), GFP_KERNEL);
 161         INIT_LIST_HEAD(&tmp->list);
 162         tmp->parent = parent;
 163         tmp->nr = nr;
 164         tmp->driver = driver;
 165         memcpy(&tmp->handler, handler, sizeof(switch_config));
 166         list_add(&tmp->list, &priv->data.list);
 167
 168         mode = 0;
 169         if (handler->read != NULL) mode |= S_IRUSR;
 170         if (handler->write != NULL) mode |= S_IWUSR;
 171
 172         if ((p = create_proc_entry(handler->name, mode, parent)) != NULL) {
 173                 p->data = (void *) tmp;
 174                 p->proc_fops = &switch_proc_fops;
 175         }
 176 }
 177
 178 static inline void add_handlers(switch_driver *driver, switch_config *handlers, struct proc_dir_entry *parent, int nr)
 179 {
 180         int i;
 181
 182         for (i = 0; handlers[i].name != NULL; i++) {
 183                 add_handler(driver, &(handlers[i]), parent, nr);
 184         }
 185 }
 186
 187 static void remove_handlers(switch_priv *priv)
 188 {
 189         struct list_head *pos, *q;
 190         switch_proc_handler *tmp;
 191
 192         list_for_each_safe(pos, q, &priv->data.list) {
 193                 tmp = list_entry(pos, switch_proc_handler, list);
 194                 list_del(pos);
 195                 remove_proc_entry(tmp->handler.name, tmp->parent);
 196                 kfree(tmp);
 197         }
 198 }
 199
 200
 201 static void do_unregister(switch_driver *driver)
 202 {
 203         char buf[4];
 204         int i;
 205         switch_priv *priv = (switch_priv *) driver->data;
 206
 207         remove_handlers(priv);
 208
 209         for(i = 0; priv->ports[i] != NULL; i++) {
 210                 sprintf(buf, "%d", i);
 211                 remove_proc_entry(buf, priv->port_dir);
 212         }
 213         kfree(priv->ports);
 214         remove_proc_entry("port", priv->driver_dir);
 215
 216         for(i = 0; priv->vlans[i] != NULL; i++) {
 217                 sprintf(buf, "%d", i);
 218                 remove_proc_entry(buf, priv->vlan_dir);
 219         }
 220         kfree(priv->vlans);
 221         remove_proc_entry("vlan", priv->driver_dir);
 222
 223         remove_proc_entry(driver->interface, switch_root);
 224
 225         if (priv->nr == (drv_num - 1))
 226                 drv_num--;
 227
 228         kfree(priv);
 229 }
 230
 231 switch_config global_driver_handlers[] = {
 232         {"driver", handle_driver_name, NULL},
 233         {"version", handle_driver_version, NULL},
 234         {NULL, NULL, NULL}
 235 };
 236
 237 static int do_register(switch_driver *driver)
 238 {
 239         switch_priv *priv;
 240         int i;
 241         char buf[4];
 242
 243         if ((priv = kmalloc(sizeof(switch_priv), GFP_KERNEL)) == NULL)
 244                 return -ENOBUFS;
 245         driver->data = (void *) priv;
 246
 247         INIT_LIST_HEAD(&priv->data.list);
 248
 249         priv->nr = drv_num++;
 250         priv->driver_dir = proc_mkdir(driver->interface, switch_root);
 251         if (driver->driver_handlers != NULL) {
 252                 add_handlers(driver, driver->driver_handlers, priv->driver_dir, 0);
 253                 add_handlers(driver, global_driver_handlers, priv->driver_dir, 0);
 254         }
 255
 256         priv->port_dir = proc_mkdir("port", priv->driver_dir);
 257         priv->ports = kmalloc((driver->ports + 1) * sizeof(struct proc_dir_entry *), GFP_KERNEL);
 258         for (i = 0; i < driver->ports; i++) {
 259                 sprintf(buf, "%d", i);
 260                 priv->ports[i] = proc_mkdir(buf, priv->port_dir);
 261                 if (driver->port_handlers != NULL)
 262                         add_handlers(driver, driver->port_handlers, priv->ports[i], i);
 263         }
 264         priv->ports[i] = NULL;
 265
 266         priv->vlan_dir = proc_mkdir("vlan", priv->driver_dir);
 267         priv->vlans = kmalloc((driver->vlans + 1) * sizeof(struct proc_dir_entry *), GFP_KERNEL);
 268         for (i = 0; i < driver->vlans; i++) {
 269                 sprintf(buf, "%d", i);
 270                 priv->vlans[i] = proc_mkdir(buf, priv->vlan_dir);
 271                 if (driver->vlan_handlers != NULL)
 272                         add_handlers(driver, driver->vlan_handlers, priv->vlans[i], i);
 273         }
 274         priv->vlans[i] = NULL;
 275
 276
 277         return 0;
 278 }
 279
 280 static inline int isspace(char c) {
 281         switch(c) {
 282                 case ' ':
 283                 case 0x09:
 284                 case 0x0a:
 285                 case 0x0d:
 286                         return 1;
 287                 default:
 288                         return 0;
 289         }
 290 }
 291
 292 #define toupper(c) (islower(c) ? ((c) ^ 0x20) : (c))
 293 #define islower(c) (((unsigned char)((c) - 'a')) < 26)
 294
 295 int switch_parse_media(char *buf)
 296 {
 297         char *str = buf;
 298         while (*buf != 0) {
 299                 *buf = toupper(*buf);
 300                 buf++;
 301         }
 302
 303         if (strncmp(str, "AUTO", 4) == 0)
 304                 return SWITCH_MEDIA_AUTO;
 305         else if (strncmp(str, "100FD", 5) == 0)
 306                 return SWITCH_MEDIA_100 | SWITCH_MEDIA_FD;
 307         else if (strncmp(str, "100HD", 5) == 0)
 308                 return SWITCH_MEDIA_100;
 309         else if (strncmp(str, "10FD", 4) == 0)
 310                 return SWITCH_MEDIA_FD;
 311         else if (strncmp(str, "10HD", 4) == 0)
 312                 return 0;
 313         else return -1;
 314 }
 315
 316 int switch_print_media(char *buf, int media)
 317 {
 318         int len = 0;
 319
 320         if (media & SWITCH_MEDIA_AUTO)
 321                 len = sprintf(buf, "Auto");
 322         else if (media == (SWITCH_MEDIA_100 | SWITCH_MEDIA_FD))
 323                 len = sprintf(buf, "100FD");
 324         else if (media == SWITCH_MEDIA_100)
 325                 len = sprintf(buf,  "100HD");
 326         else if (media == SWITCH_MEDIA_FD)
 327                 len = sprintf(buf,  "10FD");
 328         else if (media == 0)
 329                 len = sprintf(buf,  "10HD");
 330         else
 331                 len = sprintf(buf, "Invalid");
 332
 333         return len;
 334 }
 335
 336 switch_vlan_config *switch_parse_vlan(switch_driver *driver, char *buf)
 337 {
 338         switch_vlan_config *c;
 339         int j, u, p, s;
 340
 341         c = kmalloc(sizeof(switch_vlan_config), GFP_KERNEL);
 342         memset(c, 0, sizeof(switch_vlan_config));
 343
 344         while (isspace(*buf)) buf++;
 345         j = 0;
 346         while (*buf >= '0' && *buf <= '9') {
 347                 j *= 10;
 348                 j += *buf++ - '0';
 349
 350                 u = ((j == driver->cpuport) ? 0 : 1);
 351                 p = 0;
 352                 s = !(*buf >= '0' && *buf <= '9');
 353
 354                 if (s) {
 355                         while (s && !isspace(*buf) && (*buf != 0)) {
 356                                 switch(*buf) {
 357                                         case 'u':
 358                                                 u = 1;
 359                                                 break;
 360                                         case 't':
 361                                                 u = 0;
 362                                                 break;
 363                                         case '*':
 364                                                 p = 1;
 365                                                 break;
 366                                 }
 367                                 buf++;
 368                         }
 369                         c->port |= (1 << j);
 370                         if (u)
 371                                 c->untag |= (1 << j);
 372                         if (p)
 373                                 c->pvid |= (1 << j);
 374
 375                         j = 0;
 376                 }
 377
 378                 while (isspace(*buf)) buf++;
 379         }
 380         if (*buf != 0) return NULL;
 381
 382         c->port &= (1 << driver->ports) - 1;
 383         c->untag &= (1 << driver->ports) - 1;
 384         c->pvid &= (1 << driver->ports) - 1;
 385
 386         return c;
 387 }
 388
 389
 390 int switch_register_driver(switch_driver *driver)
 391 {
 392         struct list_head *pos;
 393         switch_driver *new;
 394         int ret;
 395
 396         list_for_each(pos, &drivers.list) {
 397                 if (strcmp(list_entry(pos, switch_driver, list)->name, driver->name) == 0) {
 398                         printk("Switch driver '%s' already exists in the kernel\n", driver->name);
 399                         return -EINVAL;
 400                 }
 401                 if (strcmp(list_entry(pos, switch_driver, list)->interface, driver->interface) == 0) {
 402                         printk("There is already a switch registered on the device '%s'\n", driver->interface);
 403                         return -EINVAL;
 404                 }
 405         }
 406
 407         new = kmalloc(sizeof(switch_driver), GFP_KERNEL);
 408         memcpy(new, driver, sizeof(switch_driver));
 409         new->name = strdup(driver->name);
 410         new->interface = strdup(driver->interface);
 411
 412         if ((ret = do_register(new)) < 0) {
 413                 kfree(new->name);
 414                 kfree(new);
 415                 return ret;
 416         }
 417         INIT_LIST_HEAD(&new->list);
 418         list_add(&new->list, &drivers.list);
 419
 420         return 0;
 421 }
 422
 423 void switch_unregister_driver(char *name) {
 424         struct list_head *pos, *q;
 425         switch_driver *tmp;
 426
 427         list_for_each_safe(pos, q, &drivers.list) {
 428                 tmp = list_entry(pos, switch_driver, list);
 429                 if (strcmp(tmp->name, name) == 0) {
 430                         do_unregister(tmp);
 431                         list_del(pos);
 432                         kfree(tmp->name);
 433                         kfree(tmp);
 434
 435                         return;
 436                 }
 437         }
 438 }
 439
 440 static int __init switch_init(void)
 441 {
 442         if ((switch_root = proc_mkdir("switch", NULL)) == NULL) {
 443                 printk("%s: proc_mkdir failed.\n", __FILE__);
 444                 return -ENODEV;
 445         }
 446
 447         INIT_LIST_HEAD(&drivers.list);
 448
 449         return 0;
 450 }
 451
 452 static void __exit switch_exit(void)
 453 {
 454         remove_proc_entry("switch", NULL);
 455 }
 456
 457 MODULE_AUTHOR("Felix Fietkau <openwrt@nbd.name>");
 458 MODULE_LICENSE("GPL");
 459
 460 EXPORT_SYMBOL(switch_register_driver);
 461 EXPORT_SYMBOL(switch_unregister_driver);
 462 EXPORT_SYMBOL(switch_parse_vlan);
 463 EXPORT_SYMBOL(switch_parse_media);
 464 EXPORT_SYMBOL(switch_print_media);
 465
 466 module_init(switch_init);
 467 module_exit(switch_exit);