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 inline char *strdup(char *str)
  72 {
  73         char *new = kmalloc(strlen(str) + 1, GFP_KERNEL);
  74         strcpy(new, str);
  75         return new;
  76 }
  77
  78 static ssize_t switch_proc_read(struct file *file, char *buf, size_t count, loff_t *ppos)
  79 {
  80 #ifdef LINUX_2_4
  81         struct inode *inode = file->f_dentry->d_inode;
  82         struct proc_dir_entry *dent = inode->u.generic_ip;
  83 #else
  84         struct proc_dir_entry *dent = PDE(file->f_dentry->d_inode);
  85 #endif
  86         char *page;
  87         int len = 0;
  88
  89         if ((page = kmalloc(SWITCH_MAX_BUFSZ, GFP_KERNEL)) == NULL)
  90                 return -ENOBUFS;
  91
  92         if (dent->data != NULL) {
  93                 switch_proc_handler *handler = (switch_proc_handler *) dent->data;
  94                 if (handler->handler.read != NULL)
  95                         len += handler->handler.read(handler->driver, page + len, handler->nr);
  96         }
  97         len += 1;
  98
  99         if (*ppos < len) {
 100                 len = min_t(int, len - *ppos, count);
 101                 if (copy_to_user(buf, (page + *ppos), len)) {
 102                         kfree(page);
 103                         return -EFAULT;
 104                 }
 105                 *ppos += len;
 106         } else {
 107                 len = 0;
 108         }
 109
 110         return len;
 111 }
 112
 113
 114 static ssize_t switch_proc_write(struct file *file, const char *buf, size_t count, void *data)
 115 {
 116 #ifdef LINUX_2_4
 117         struct inode *inode = file->f_dentry->d_inode;
 118         struct proc_dir_entry *dent = inode->u.generic_ip;
 119 #else
 120         struct proc_dir_entry *dent = PDE(file->f_dentry->d_inode);
 121 #endif
 122         char *page;
 123         int ret = -EINVAL;
 124
 125         if ((page = kmalloc(count + 1, GFP_KERNEL)) == NULL)
 126                 return -ENOBUFS;
 127
 128         if (copy_from_user(page, buf, count)) {
 129                 kfree(page);
 130                 return -EINVAL;
 131         }
 132         page[count] = 0;
 133
 134         if (dent->data != NULL) {
 135                 switch_proc_handler *handler = (switch_proc_handler *) dent->data;
 136                 if (handler->handler.write != NULL) {
 137                         if ((ret = handler->handler.write(handler->driver, page, handler->nr)) >= 0)
 138                                 ret = count;
 139                 }
 140         }
 141
 142         kfree(page);
 143         return ret;
 144 }
 145
 146 static int handle_driver_name(void *driver, char *buf, int nr)
 147 {
 148         char *name = ((switch_driver *) driver)->name;
 149         return sprintf(buf, "%s\n", name);
 150 }
 151
 152 static int handle_driver_version(void *driver, char *buf, int nr)
 153 {
 154         char *version = ((switch_driver *) driver)->version;
 155         strcpy(buf, version);
 156         return sprintf(buf, "%s\n", version);
 157 }
 158
 159 static void add_handler(switch_driver *driver, switch_config *handler, struct proc_dir_entry *parent, int nr)
 160 {
 161         switch_priv *priv = (switch_priv *) driver->data;
 162         struct proc_dir_entry *p;
 163         int mode;
 164
 165         switch_proc_handler *tmp;
 166         tmp = (switch_proc_handler *) kmalloc(sizeof(switch_proc_handler), GFP_KERNEL);
 167         INIT_LIST_HEAD(&tmp->list);
 168         tmp->parent = parent;
 169         tmp->nr = nr;
 170         tmp->driver = driver;
 171         memcpy(&tmp->handler, handler, sizeof(switch_config));
 172         list_add(&tmp->list, &priv->data.list);
 173
 174         mode = 0;
 175         if (handler->read != NULL) mode |= S_IRUSR;
 176         if (handler->write != NULL) mode |= S_IWUSR;
 177
 178         if ((p = create_proc_entry(handler->name, mode, parent)) != NULL) {
 179                 p->data = (void *) tmp;
 180                 p->proc_fops = &switch_proc_fops;
 181         }
 182 }
 183
 184 static inline void add_handlers(switch_driver *driver, switch_config *handlers, struct proc_dir_entry *parent, int nr)
 185 {
 186         int i;
 187
 188         for (i = 0; handlers[i].name != NULL; i++) {
 189                 add_handler(driver, &(handlers[i]), parent, nr);
 190         }
 191 }
 192
 193 static void remove_handlers(switch_priv *priv)
 194 {
 195         struct list_head *pos, *q;
 196         switch_proc_handler *tmp;
 197
 198         list_for_each_safe(pos, q, &priv->data.list) {
 199                 tmp = list_entry(pos, switch_proc_handler, list);
 200                 list_del(pos);
 201                 remove_proc_entry(tmp->handler.name, tmp->parent);
 202                 kfree(tmp);
 203         }
 204 }
 205
 206
 207 static void do_unregister(switch_driver *driver)
 208 {
 209         char buf[4];
 210         int i;
 211         switch_priv *priv = (switch_priv *) driver->data;
 212
 213         remove_handlers(priv);
 214
 215         for(i = 0; priv->ports[i] != NULL; i++) {
 216                 sprintf(buf, "%d", i);
 217                 remove_proc_entry(buf, priv->port_dir);
 218         }
 219         kfree(priv->ports);
 220         remove_proc_entry("port", priv->driver_dir);
 221
 222         for(i = 0; priv->vlans[i] != NULL; i++) {
 223                 sprintf(buf, "%d", i);
 224                 remove_proc_entry(buf, priv->vlan_dir);
 225         }
 226         kfree(priv->vlans);
 227         remove_proc_entry("vlan", priv->driver_dir);
 228
 229         remove_proc_entry(driver->interface, switch_root);
 230
 231         if (priv->nr == (drv_num - 1))
 232                 drv_num--;
 233
 234         kfree(priv);
 235 }
 236
 237 switch_config global_driver_handlers[] = {
 238         {"driver", handle_driver_name, NULL},
 239         {"version", handle_driver_version, NULL},
 240         {NULL, NULL, NULL}
 241 };
 242
 243 static int do_register(switch_driver *driver)
 244 {
 245         switch_priv *priv;
 246         int i;
 247         char buf[4];
 248
 249         if ((priv = kmalloc(sizeof(switch_priv), GFP_KERNEL)) == NULL)
 250                 return -ENOBUFS;
 251         driver->data = (void *) priv;
 252
 253         INIT_LIST_HEAD(&priv->data.list);
 254
 255         priv->nr = drv_num++;
 256         priv->driver_dir = proc_mkdir(driver->interface, switch_root);
 257         if (driver->driver_handlers != NULL) {
 258                 add_handlers(driver, driver->driver_handlers, priv->driver_dir, 0);
 259                 add_handlers(driver, global_driver_handlers, priv->driver_dir, 0);
 260         }
 261
 262         priv->port_dir = proc_mkdir("port", priv->driver_dir);
 263         priv->ports = kmalloc((driver->ports + 1) * sizeof(struct proc_dir_entry *), GFP_KERNEL);
 264         for (i = 0; i < driver->ports; i++) {
 265                 sprintf(buf, "%d", i);
 266                 priv->ports[i] = proc_mkdir(buf, priv->port_dir);
 267                 if (driver->port_handlers != NULL)
 268                         add_handlers(driver, driver->port_handlers, priv->ports[i], i);
 269         }
 270         priv->ports[i] = NULL;
 271
 272         priv->vlan_dir = proc_mkdir("vlan", priv->driver_dir);
 273         priv->vlans = kmalloc((driver->vlans + 1) * sizeof(struct proc_dir_entry *), GFP_KERNEL);
 274         for (i = 0; i < driver->vlans; i++) {
 275                 sprintf(buf, "%d", i);
 276                 priv->vlans[i] = proc_mkdir(buf, priv->vlan_dir);
 277                 if (driver->vlan_handlers != NULL)
 278                         add_handlers(driver, driver->vlan_handlers, priv->vlans[i], i);
 279         }
 280         priv->vlans[i] = NULL;
 281
 282
 283         return 0;
 284 }
 285
 286 static inline int isspace(char c) {
 287         switch(c) {
 288                 case ' ':
 289                 case 0x09:
 290                 case 0x0a:
 291                 case 0x0d:
 292                         return 1;
 293                 default:
 294                         return 0;
 295         }
 296 }
 297
 298 #define toupper(c) (islower(c) ? ((c) ^ 0x20) : (c))
 299 #define islower(c) (((unsigned char)((c) - 'a')) < 26)
 300
 301 int switch_parse_media(char *buf)
 302 {
 303         char *str = buf;
 304         while (*buf != 0) {
 305                 *buf = toupper(*buf);
 306                 buf++;
 307         }
 308
 309         if (strncmp(str, "AUTO", 4) == 0)
 310                 return SWITCH_MEDIA_AUTO;
 311         else if (strncmp(str, "100FD", 5) == 0)
 312                 return SWITCH_MEDIA_100 | SWITCH_MEDIA_FD;
 313         else if (strncmp(str, "100HD", 5) == 0)
 314                 return SWITCH_MEDIA_100;
 315         else if (strncmp(str, "10FD", 4) == 0)
 316                 return SWITCH_MEDIA_FD;
 317         else if (strncmp(str, "10HD", 4) == 0)
 318                 return 0;
 319         else return -1;
 320 }
 321
 322 int switch_print_media(char *buf, int media)
 323 {
 324         int len = 0;
 325
 326         if (media & SWITCH_MEDIA_AUTO)
 327                 len = sprintf(buf, "Auto");
 328         else if (media == (SWITCH_MEDIA_100 | SWITCH_MEDIA_FD))
 329                 len = sprintf(buf, "100FD");
 330         else if (media == SWITCH_MEDIA_100)
 331                 len = sprintf(buf,  "100HD");
 332         else if (media == SWITCH_MEDIA_FD)
 333                 len = sprintf(buf,  "10FD");
 334         else if (media == 0)
 335                 len = sprintf(buf,  "10HD");
 336         else
 337                 len = sprintf(buf, "Invalid");
 338
 339         return len;
 340 }
 341
 342 switch_vlan_config *switch_parse_vlan(switch_driver *driver, char *buf)
 343 {
 344         switch_vlan_config *c;
 345         int j, u, p, s;
 346
 347         c = kmalloc(sizeof(switch_vlan_config), GFP_KERNEL);
 348         memset(c, 0, sizeof(switch_vlan_config));
 349
 350         while (isspace(*buf)) buf++;
 351         j = 0;
 352         while (*buf >= '0' && *buf <= '9') {
 353                 j *= 10;
 354                 j += *buf++ - '0';
 355
 356                 u = ((j == driver->cpuport) ? 0 : 1);
 357                 p = 0;
 358                 s = !(*buf >= '0' && *buf <= '9');
 359
 360                 if (s) {
 361                         while (s && !isspace(*buf) && (*buf != 0)) {
 362                                 switch(*buf) {
 363                                         case 'u':
 364                                                 u = 1;
 365                                                 break;
 366                                         case 't':
 367                                                 u = 0;
 368                                                 break;
 369                                         case '*':
 370                                                 p = 1;
 371                                                 break;
 372                                 }
 373                                 buf++;
 374                         }
 375                         c->port |= (1 << j);
 376                         if (u)
 377                                 c->untag |= (1 << j);
 378                         if (p)
 379                                 c->pvid |= (1 << j);
 380
 381                         j = 0;
 382                 }
 383
 384                 while (isspace(*buf)) buf++;
 385         }
 386         if (*buf != 0) return NULL;
 387
 388         c->port &= (1 << driver->ports) - 1;
 389         c->untag &= (1 << driver->ports) - 1;
 390         c->pvid &= (1 << driver->ports) - 1;
 391
 392         return c;
 393 }
 394
 395
 396 int switch_register_driver(switch_driver *driver)
 397 {
 398         struct list_head *pos;
 399         switch_driver *new;
 400         int ret;
 401
 402         list_for_each(pos, &drivers.list) {
 403                 if (strcmp(list_entry(pos, switch_driver, list)->name, driver->name) == 0) {
 404                         printk("Switch driver '%s' already exists in the kernel\n", driver->name);
 405                         return -EINVAL;
 406                 }
 407                 if (strcmp(list_entry(pos, switch_driver, list)->interface, driver->interface) == 0) {
 408                         printk("There is already a switch registered on the device '%s'\n", driver->interface);
 409                         return -EINVAL;
 410                 }
 411         }
 412
 413         new = kmalloc(sizeof(switch_driver), GFP_KERNEL);
 414         memcpy(new, driver, sizeof(switch_driver));
 415         new->name = strdup(driver->name);
 416         new->interface = strdup(driver->interface);
 417
 418         if ((ret = do_register(new)) < 0) {
 419                 kfree(new->name);
 420                 kfree(new);
 421                 return ret;
 422         }
 423         INIT_LIST_HEAD(&new->list);
 424         list_add(&new->list, &drivers.list);
 425
 426         return 0;
 427 }
 428
 429 void switch_unregister_driver(char *name) {
 430         struct list_head *pos, *q;
 431         switch_driver *tmp;
 432
 433         list_for_each_safe(pos, q, &drivers.list) {
 434                 tmp = list_entry(pos, switch_driver, list);
 435                 if (strcmp(tmp->name, name) == 0) {
 436                         do_unregister(tmp);
 437                         list_del(pos);
 438                         kfree(tmp->name);
 439                         kfree(tmp);
 440
 441                         return;
 442                 }
 443         }
 444 }
 445
 446 static int __init switch_init()
 447 {
 448         if ((switch_root = proc_mkdir("switch", NULL)) == NULL) {
 449                 printk("%s: proc_mkdir failed.\n", __FILE__);
 450                 return -ENODEV;
 451         }
 452
 453         INIT_LIST_HEAD(&drivers.list);
 454
 455         return 0;
 456 }
 457
 458 static void __exit switch_exit()
 459 {
 460         remove_proc_entry("switch", NULL);
 461 }
 462
 463 MODULE_AUTHOR("Felix Fietkau <openwrt@nbd.name>");
 464 MODULE_LICENSE("GPL");
 465
 466 EXPORT_SYMBOL(switch_register_driver);
 467 EXPORT_SYMBOL(switch_unregister_driver);
 468 EXPORT_SYMBOL(switch_parse_vlan);
 469 EXPORT_SYMBOL(switch_parse_media);
 470 EXPORT_SYMBOL(switch_print_media);
 471
 472 module_init(switch_init);
 473 module_exit(switch_exit);