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  *
  21  * Basic doc of driver's /proc interface:
  22  * /proc/switch/<interface>/
  23  *   registers:              read-only
  24  *   counters:               read-only
  25  *   reset:                  write causes hardware reset
  26  *   enable_vlan:            "0", "1"
  27  *   port/<port-number>/
  28  *     enabled:              "0", "1"
  29  *     media:                "AUTO", "100FD", "100HD", "10FD", "10HD"
  30  *   vlan/<port-number>/
  31  *     ports: same syntax as for nvram's vlan*ports (eg. "1 2 3 4 5*")
  32  */
  33
  34 #include <linux/module.h>
  35 #include <linux/init.h>
  36 #include <asm/uaccess.h>
  37 #include <linux/proc_fs.h>
  38 #include <linux/list.h>
  39
  40 #include "switch-core.h"
  41
  42 static int drv_num = 0;
  43 static struct proc_dir_entry *switch_root;
  44 switch_driver drivers;
  45
  46 typedef struct {
  47         struct list_head list;
  48         struct proc_dir_entry *parent;
  49         int nr;
  50         void *driver;
  51         switch_config handler;
  52 } switch_proc_handler;
  53
  54 typedef struct {
  55         struct proc_dir_entry *driver_dir, *port_dir, *vlan_dir;
  56         struct proc_dir_entry **ports, **vlans;
  57         switch_proc_handler data;
  58         int nr;
  59 } switch_priv;
  60
  61 static ssize_t switch_proc_read(struct file *file, char *buf, size_t count, loff_t *ppos);
  62 static ssize_t switch_proc_write(struct file *file, const char *buf, size_t count, void *data);
  63
  64 static struct file_operations switch_proc_fops = {
  65         .read = (ssize_t (*) (struct file *, char __user *, size_t, loff_t *))switch_proc_read,
  66         .write = (ssize_t (*) (struct file *, const char __user *, size_t, loff_t *))switch_proc_write
  67 };
  68
  69 static ssize_t switch_proc_read(struct file *file, char *buf, size_t count, loff_t *ppos)
  70 {
  71 #ifdef LINUX_2_4
  72         struct inode *inode = file->f_dentry->d_inode;
  73         struct proc_dir_entry *dent = inode->u.generic_ip;
  74 #else
  75         struct proc_dir_entry *dent = PDE(file->f_dentry->d_inode);
  76 #endif
  77         char *page;
  78         int len = 0;
  79
  80         if ((page = kmalloc(SWITCH_MAX_BUFSZ, GFP_KERNEL)) == NULL)
  81                 return -ENOBUFS;
  82
  83         if (dent->data != NULL) {
  84                 switch_proc_handler *handler = (switch_proc_handler *) dent->data;
  85                 if (handler->handler.read != NULL)
  86                         len += handler->handler.read(handler->driver, page + len, handler->nr);
  87         }
  88         len += 1;
  89
  90         if (*ppos < len) {
  91                 len = min_t(int, len - *ppos, count);
  92                 if (copy_to_user(buf, (page + *ppos), len)) {
  93                         kfree(page);
  94                         return -EFAULT;
  95                 }
  96                 *ppos += len;
  97         } else {
  98                 len = 0;
  99         }
 100
 101         kfree(page);
 102         return len;
 103 }
 104
 105
 106 static ssize_t switch_proc_write(struct file *file, const char *buf, size_t count, void *data)
 107 {
 108 #ifdef LINUX_2_4
 109         struct inode *inode = file->f_dentry->d_inode;
 110         struct proc_dir_entry *dent = inode->u.generic_ip;
 111 #else
 112         struct proc_dir_entry *dent = PDE(file->f_dentry->d_inode);
 113 #endif
 114         char *page;
 115         int ret = -EINVAL;
 116
 117         if ((page = kmalloc(count + 1, GFP_KERNEL)) == NULL)
 118                 return -ENOBUFS;
 119
 120         if (copy_from_user(page, buf, count)) {
 121                 kfree(page);
 122                 return -EINVAL;
 123         }
 124         page[count] = 0;
 125
 126         if (dent->data != NULL) {
 127                 switch_proc_handler *handler = (switch_proc_handler *) dent->data;
 128                 if (handler->handler.write != NULL) {
 129                         if ((ret = handler->handler.write(handler->driver, page, handler->nr)) >= 0)
 130                                 ret = count;
 131                 }
 132         }
 133
 134         kfree(page);
 135         return ret;
 136 }
 137
 138 static int handle_driver_name(void *driver, char *buf, int nr)
 139 {
 140         const char *name = ((switch_driver *) driver)->name;
 141         return sprintf(buf, "%s\n", name);
 142 }
 143
 144 static int handle_driver_version(void *driver, char *buf, int nr)
 145 {
 146         const char *version = ((switch_driver *) driver)->version;
 147         strcpy(buf, version);
 148         return sprintf(buf, "%s\n", version);
 149 }
 150
 151 static void add_handler(switch_driver *driver, const switch_config *handler, struct proc_dir_entry *parent, int nr)
 152 {
 153         switch_priv *priv = (switch_priv *) driver->data;
 154         struct proc_dir_entry *p;
 155         int mode;
 156
 157         switch_proc_handler *tmp;
 158         tmp = (switch_proc_handler *) kmalloc(sizeof(switch_proc_handler), GFP_KERNEL);
 159         if (!tmp)
 160                 return;
 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, const 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         priv = kmalloc(sizeof(switch_priv), GFP_KERNEL);
 244         if (!priv)
 245                 return -ENOMEM;
 246         driver->data = (void *) priv;
 247
 248         priv->ports = kmalloc((driver->ports + 1) * sizeof(struct proc_dir_entry *),
 249                               GFP_KERNEL);
 250         if (!priv->ports) {
 251                 kfree(priv);
 252                 return -ENOMEM;
 253         }
 254         priv->vlans = kmalloc((driver->vlans + 1) * sizeof(struct proc_dir_entry *),
 255                               GFP_KERNEL);
 256         if (!priv->vlans) {
 257                 kfree(priv->ports);
 258                 kfree(priv);
 259                 return -ENOMEM;
 260         }
 261
 262         INIT_LIST_HEAD(&priv->data.list);
 263
 264         priv->nr = drv_num++;
 265         priv->driver_dir = proc_mkdir(driver->interface, switch_root);
 266         if (driver->driver_handlers != NULL) {
 267                 add_handlers(driver, driver->driver_handlers, priv->driver_dir, 0);
 268                 add_handlers(driver, global_driver_handlers, priv->driver_dir, 0);
 269         }
 270
 271         priv->port_dir = proc_mkdir("port", priv->driver_dir);
 272         for (i = 0; i < driver->ports; i++) {
 273                 sprintf(buf, "%d", i);
 274                 priv->ports[i] = proc_mkdir(buf, priv->port_dir);
 275                 if (driver->port_handlers != NULL)
 276                         add_handlers(driver, driver->port_handlers, priv->ports[i], i);
 277         }
 278         priv->ports[i] = NULL;
 279
 280         priv->vlan_dir = proc_mkdir("vlan", priv->driver_dir);
 281         for (i = 0; i < driver->vlans; i++) {
 282                 sprintf(buf, "%d", i);
 283                 priv->vlans[i] = proc_mkdir(buf, priv->vlan_dir);
 284                 if (driver->vlan_handlers != NULL)
 285                         add_handlers(driver, driver->vlan_handlers, priv->vlans[i], i);
 286         }
 287         priv->vlans[i] = NULL;
 288
 289
 290         return 0;
 291 }
 292
 293 static inline int isspace(char c) {
 294         switch(c) {
 295                 case ' ':
 296                 case 0x09:
 297                 case 0x0a:
 298                 case 0x0d:
 299                         return 1;
 300                 default:
 301                         return 0;
 302         }
 303 }
 304
 305 #define toupper(c) (islower(c) ? ((c) ^ 0x20) : (c))
 306 #define islower(c) (((unsigned char)((c) - 'a')) < 26)
 307
 308 int switch_parse_media(char *buf)
 309 {
 310         char *str = buf;
 311         while (*buf != 0) {
 312                 *buf = toupper(*buf);
 313                 buf++;
 314         }
 315
 316         if (strncmp(str, "AUTO", 4) == 0)
 317                 return SWITCH_MEDIA_AUTO;
 318         else if (strncmp(str, "100FD", 5) == 0)
 319                 return SWITCH_MEDIA_100 | SWITCH_MEDIA_FD;
 320         else if (strncmp(str, "100HD", 5) == 0)
 321                 return SWITCH_MEDIA_100;
 322         else if (strncmp(str, "10FD", 4) == 0)
 323                 return SWITCH_MEDIA_FD;
 324         else if (strncmp(str, "10HD", 4) == 0)
 325                 return 0;
 326         else return -1;
 327 }
 328
 329 int switch_print_media(char *buf, int media)
 330 {
 331         int len = 0;
 332
 333         if (media & SWITCH_MEDIA_AUTO)
 334                 len = sprintf(buf, "Auto");
 335         else if (media == (SWITCH_MEDIA_100 | SWITCH_MEDIA_FD))
 336                 len = sprintf(buf, "100FD");
 337         else if (media == SWITCH_MEDIA_100)
 338                 len = sprintf(buf,  "100HD");
 339         else if (media == SWITCH_MEDIA_FD)
 340                 len = sprintf(buf,  "10FD");
 341         else if (media == 0)
 342                 len = sprintf(buf,  "10HD");
 343         else
 344                 len = sprintf(buf, "Invalid");
 345
 346         return len;
 347 }
 348
 349 switch_vlan_config *switch_parse_vlan(switch_driver *driver, char *buf)
 350 {
 351         switch_vlan_config *c;
 352         int j, u, p, s;
 353
 354         c = kmalloc(sizeof(switch_vlan_config), GFP_KERNEL);
 355         if (!c)
 356                 return NULL;
 357         memset(c, 0, sizeof(switch_vlan_config));
 358
 359         while (isspace(*buf)) buf++;
 360         j = 0;
 361         while (*buf >= '0' && *buf <= '9') {
 362                 j *= 10;
 363                 j += *buf++ - '0';
 364
 365                 u = ((j == driver->cpuport) ? 0 : 1);
 366                 p = 0;
 367                 s = !(*buf >= '0' && *buf <= '9');
 368
 369                 if (s) {
 370                         while (s && !isspace(*buf) && (*buf != 0)) {
 371                                 switch(*buf) {
 372                                         case 'u':
 373                                                 u = 1;
 374                                                 break;
 375                                         case 't':
 376                                                 u = 0;
 377                                                 break;
 378                                         case '*':
 379                                                 p = 1;
 380                                                 break;
 381                                 }
 382                                 buf++;
 383                         }
 384                         c->port |= (1 << j);
 385                         if (u)
 386                                 c->untag |= (1 << j);
 387                         if (p)
 388                                 c->pvid |= (1 << j);
 389
 390                         j = 0;
 391                 }
 392
 393                 while (isspace(*buf)) buf++;
 394         }
 395         if (*buf != 0) return NULL;
 396
 397         c->port &= (1 << driver->ports) - 1;
 398         c->untag &= (1 << driver->ports) - 1;
 399         c->pvid &= (1 << driver->ports) - 1;
 400
 401         return c;
 402 }
 403
 404
 405 int switch_device_registered (char* device) {
 406         struct list_head *pos;
 407         switch_driver *new;
 408
 409         list_for_each(pos, &drivers.list) {
 410                 if (strcmp(list_entry(pos, switch_driver, list)->interface, device) == 0) {
 411                         printk("There is already a switch registered on the device '%s'\n", device);
 412                         return -EINVAL;
 413                 }
 414         }
 415
 416         return 0;
 417 }
 418
 419
 420 int switch_register_driver(switch_driver *driver)
 421 {
 422         struct list_head *pos;
 423         switch_driver *new;
 424         int ret;
 425
 426         list_for_each(pos, &drivers.list) {
 427                 if (strcmp(list_entry(pos, switch_driver, list)->name, driver->name) == 0) {
 428                         printk("Switch driver '%s' already exists in the kernel\n", driver->name);
 429                         return -EINVAL;
 430                 }
 431                 if (strcmp(list_entry(pos, switch_driver, list)->interface, driver->interface) == 0) {
 432                         printk("There is already a switch registered on the device '%s'\n", driver->interface);
 433                         return -EINVAL;
 434                 }
 435         }
 436
 437         new = kmalloc(sizeof(switch_driver), GFP_KERNEL);
 438         if (!new)
 439                 return -ENOMEM;
 440         memcpy(new, driver, sizeof(switch_driver));
 441         new->name = strdup(driver->name);
 442         new->interface = strdup(driver->interface);
 443
 444         if ((ret = do_register(new)) < 0) {
 445                 kfree(new->name);
 446                 kfree(new);
 447                 return ret;
 448         }
 449         INIT_LIST_HEAD(&new->list);
 450         list_add(&new->list, &drivers.list);
 451
 452         return 0;
 453 }
 454
 455 void switch_unregister_driver(char *name) {
 456         struct list_head *pos, *q;
 457         switch_driver *tmp;
 458
 459         list_for_each_safe(pos, q, &drivers.list) {
 460                 tmp = list_entry(pos, switch_driver, list);
 461                 if (strcmp(tmp->name, name) == 0) {
 462                         do_unregister(tmp);
 463                         list_del(pos);
 464                         kfree(tmp->name);
 465                         kfree(tmp);
 466
 467                         return;
 468                 }
 469         }
 470 }
 471
 472 static int __init switch_init(void)
 473 {
 474         if ((switch_root = proc_mkdir("switch", NULL)) == NULL) {
 475                 printk("%s: proc_mkdir failed.\n", __FILE__);
 476                 return -ENODEV;
 477         }
 478
 479         INIT_LIST_HEAD(&drivers.list);
 480
 481         return 0;
 482 }
 483
 484 static void __exit switch_exit(void)
 485 {
 486         remove_proc_entry("switch", NULL);
 487 }
 488
 489 MODULE_AUTHOR("Felix Fietkau <openwrt@nbd.name>");
 490 MODULE_LICENSE("GPL");
 491
 492 EXPORT_SYMBOL(switch_device_registered);
 493 EXPORT_SYMBOL(switch_register_driver);
 494 EXPORT_SYMBOL(switch_unregister_driver);
 495 EXPORT_SYMBOL(switch_parse_vlan);
 496 EXPORT_SYMBOL(switch_parse_media);
 497 EXPORT_SYMBOL(switch_print_media);
 498
 499 module_init(switch_init);
 500 module_exit(switch_exit);