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