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         struct proc_dir_entry *dent = PDE(file->f_dentry->d_inode);
  72         char *page;
  73         int len = 0;
  74
  75         if ((page = kmalloc(SWITCH_MAX_BUFSZ, GFP_KERNEL)) == NULL)
  76                 return -ENOBUFS;
  77
  78         if (dent->data != NULL) {
  79                 switch_proc_handler *handler = (switch_proc_handler *) dent->data;
  80                 if (handler->handler.read != NULL)
  81                         len += handler->handler.read(handler->driver, page + len, handler->nr);
  82         }
  83         len += 1;
  84
  85         if (*ppos < len) {
  86                 len = min_t(int, len - *ppos, count);
  87                 if (copy_to_user(buf, (page + *ppos), len)) {
  88                         kfree(page);
  89                         return -EFAULT;
  90                 }
  91                 *ppos += len;
  92         } else {
  93                 len = 0;
  94         }
  95
  96         kfree(page);
  97         return len;
  98 }
  99
 100
 101 static ssize_t switch_proc_write(struct file *file, const char *buf, size_t count, void *data)
 102 {
 103         struct proc_dir_entry *dent = PDE(file->f_dentry->d_inode);
 104         char *page;
 105         int ret = -EINVAL;
 106
 107         if ((page = kmalloc(count + 1, GFP_KERNEL)) == NULL)
 108                 return -ENOBUFS;
 109
 110         if (copy_from_user(page, buf, count)) {
 111                 kfree(page);
 112                 return -EINVAL;
 113         }
 114         page[count] = 0;
 115
 116         if (dent->data != NULL) {
 117                 switch_proc_handler *handler = (switch_proc_handler *) dent->data;
 118                 if (handler->handler.write != NULL) {
 119                         if ((ret = handler->handler.write(handler->driver, page, handler->nr)) >= 0)
 120                                 ret = count;
 121                 }
 122         }
 123
 124         kfree(page);
 125         return ret;
 126 }
 127
 128 static int handle_driver_name(void *driver, char *buf, int nr)
 129 {
 130         const char *name = ((switch_driver *) driver)->name;
 131         return sprintf(buf, "%s\n", name);
 132 }
 133
 134 static int handle_driver_version(void *driver, char *buf, int nr)
 135 {
 136         const char *version = ((switch_driver *) driver)->version;
 137         strcpy(buf, version);
 138         return sprintf(buf, "%s\n", version);
 139 }
 140
 141 static void add_handler(switch_driver *driver, const switch_config *handler, struct proc_dir_entry *parent, int nr)
 142 {
 143         switch_priv *priv = (switch_priv *) driver->data;
 144         struct proc_dir_entry *p;
 145         int mode;
 146
 147         switch_proc_handler *tmp;
 148         tmp = (switch_proc_handler *) kmalloc(sizeof(switch_proc_handler), GFP_KERNEL);
 149         if (!tmp)
 150                 return;
 151         INIT_LIST_HEAD(&tmp->list);
 152         tmp->parent = parent;
 153         tmp->nr = nr;
 154         tmp->driver = driver;
 155         memcpy(&tmp->handler, handler, sizeof(switch_config));
 156         list_add(&tmp->list, &priv->data.list);
 157
 158         mode = 0;
 159         if (handler->read != NULL) mode |= S_IRUSR;
 160         if (handler->write != NULL) mode |= S_IWUSR;
 161
 162         if ((p = create_proc_entry(handler->name, mode, parent)) != NULL) {
 163                 p->data = (void *) tmp;
 164                 p->proc_fops = &switch_proc_fops;
 165         }
 166 }
 167
 168 static inline void add_handlers(switch_driver *driver, const switch_config *handlers, struct proc_dir_entry *parent, int nr)
 169 {
 170         int i;
 171
 172         for (i = 0; handlers[i].name != NULL; i++) {
 173                 add_handler(driver, &(handlers[i]), parent, nr);
 174         }
 175 }
 176
 177 static void remove_handlers(switch_priv *priv)
 178 {
 179         struct list_head *pos, *q;
 180         switch_proc_handler *tmp;
 181
 182         list_for_each_safe(pos, q, &priv->data.list) {
 183                 tmp = list_entry(pos, switch_proc_handler, list);
 184                 list_del(pos);
 185                 remove_proc_entry(tmp->handler.name, tmp->parent);
 186                 kfree(tmp);
 187         }
 188 }
 189
 190
 191 static void do_unregister(switch_driver *driver)
 192 {
 193         char buf[4];
 194         int i;
 195         switch_priv *priv = (switch_priv *) driver->data;
 196
 197         remove_handlers(priv);
 198
 199         for(i = 0; priv->ports[i] != NULL; i++) {
 200                 sprintf(buf, "%d", i);
 201                 remove_proc_entry(buf, priv->port_dir);
 202         }
 203         kfree(priv->ports);
 204         remove_proc_entry("port", priv->driver_dir);
 205
 206         for(i = 0; priv->vlans[i] != NULL; i++) {
 207                 sprintf(buf, "%d", i);
 208                 remove_proc_entry(buf, priv->vlan_dir);
 209         }
 210         kfree(priv->vlans);
 211         remove_proc_entry("vlan", priv->driver_dir);
 212
 213         remove_proc_entry(driver->interface, switch_root);
 214
 215         if (priv->nr == (drv_num - 1))
 216                 drv_num--;
 217
 218         kfree(priv);
 219 }
 220
 221 switch_config global_driver_handlers[] = {
 222         {"driver", handle_driver_name, NULL},
 223         {"version", handle_driver_version, NULL},
 224         {NULL, NULL, NULL}
 225 };
 226
 227 static int do_register(switch_driver *driver)
 228 {
 229         switch_priv *priv;
 230         int i;
 231         char buf[4];
 232
 233         priv = kmalloc(sizeof(switch_priv), GFP_KERNEL);
 234         if (!priv)
 235                 return -ENOMEM;
 236         driver->data = (void *) priv;
 237
 238         priv->ports = kmalloc((driver->ports + 1) * sizeof(struct proc_dir_entry *),
 239                               GFP_KERNEL);
 240         if (!priv->ports) {
 241                 kfree(priv);
 242                 return -ENOMEM;
 243         }
 244         priv->vlans = kmalloc((driver->vlans + 1) * sizeof(struct proc_dir_entry *),
 245                               GFP_KERNEL);
 246         if (!priv->vlans) {
 247                 kfree(priv->ports);
 248                 kfree(priv);
 249                 return -ENOMEM;
 250         }
 251
 252         INIT_LIST_HEAD(&priv->data.list);
 253
 254         priv->nr = drv_num++;
 255         priv->driver_dir = proc_mkdir(driver->interface, switch_root);
 256         if (driver->driver_handlers != NULL) {
 257                 add_handlers(driver, driver->driver_handlers, priv->driver_dir, 0);
 258                 add_handlers(driver, global_driver_handlers, priv->driver_dir, 0);
 259         }
 260
 261         priv->port_dir = proc_mkdir("port", priv->driver_dir);
 262         for (i = 0; i < driver->ports; i++) {
 263                 sprintf(buf, "%d", i);
 264                 priv->ports[i] = proc_mkdir(buf, priv->port_dir);
 265                 if (driver->port_handlers != NULL)
 266                         add_handlers(driver, driver->port_handlers, priv->ports[i], i);
 267         }
 268         priv->ports[i] = NULL;
 269
 270         priv->vlan_dir = proc_mkdir("vlan", priv->driver_dir);
 271         for (i = 0; i < driver->vlans; i++) {
 272                 sprintf(buf, "%d", i);
 273                 priv->vlans[i] = proc_mkdir(buf, priv->vlan_dir);
 274                 if (driver->vlan_handlers != NULL)
 275                         add_handlers(driver, driver->vlan_handlers, priv->vlans[i], i);
 276         }
 277         priv->vlans[i] = NULL;
 278
 279
 280         return 0;
 281 }
 282
 283 static inline int isspace(char c) {
 284         switch(c) {
 285                 case ' ':
 286                 case 0x09:
 287                 case 0x0a:
 288                 case 0x0d:
 289                         return 1;
 290                 default:
 291                         return 0;
 292         }
 293 }
 294
 295 #define toupper(c) (islower(c) ? ((c) ^ 0x20) : (c))
 296 #define islower(c) (((unsigned char)((c) - 'a')) < 26)
 297
 298 int switch_parse_media(char *buf)
 299 {
 300         char *str = buf;
 301         while (*buf != 0) {
 302                 *buf = toupper(*buf);
 303                 buf++;
 304         }
 305
 306         if (strncmp(str, "AUTO", 4) == 0)
 307                 return SWITCH_MEDIA_AUTO;
 308         else if (strncmp(str, "100FD", 5) == 0)
 309                 return SWITCH_MEDIA_100 | SWITCH_MEDIA_FD;
 310         else if (strncmp(str, "100HD", 5) == 0)
 311                 return SWITCH_MEDIA_100;
 312         else if (strncmp(str, "10FD", 4) == 0)
 313                 return SWITCH_MEDIA_FD;
 314         else if (strncmp(str, "10HD", 4) == 0)
 315                 return 0;
 316         else return -1;
 317 }
 318
 319 int switch_print_media(char *buf, int media)
 320 {
 321         int len = 0;
 322
 323         if (media & SWITCH_MEDIA_AUTO)
 324                 len = sprintf(buf, "Auto");
 325         else if (media == (SWITCH_MEDIA_100 | SWITCH_MEDIA_FD))
 326                 len = sprintf(buf, "100FD");
 327         else if (media == SWITCH_MEDIA_100)
 328                 len = sprintf(buf,  "100HD");
 329         else if (media == SWITCH_MEDIA_FD)
 330                 len = sprintf(buf,  "10FD");
 331         else if (media == 0)
 332                 len = sprintf(buf,  "10HD");
 333         else
 334                 len = sprintf(buf, "Invalid");
 335
 336         return len;
 337 }
 338
 339 switch_vlan_config *switch_parse_vlan(switch_driver *driver, char *buf)
 340 {
 341         switch_vlan_config *c;
 342         int j, u, p, s;
 343
 344         c = kzalloc(sizeof(switch_vlan_config), GFP_KERNEL);
 345         if (!c)
 346                 return NULL;
 347
 348         while (isspace(*buf)) buf++;
 349         j = 0;
 350         while (*buf >= '0' && *buf <= '9') {
 351                 j *= 10;
 352                 j += *buf++ - '0';
 353
 354                 u = ((j == driver->cpuport) ? 0 : 1);
 355                 p = 0;
 356                 s = !(*buf >= '0' && *buf <= '9');
 357
 358                 if (s) {
 359                         while (s && !isspace(*buf) && (*buf != 0)) {
 360                                 switch(*buf) {
 361                                         case 'u':
 362                                                 u = 1;
 363                                                 break;
 364                                         case 't':
 365                                                 u = 0;
 366                                                 break;
 367                                         case '*':
 368                                                 p = 1;
 369                                                 break;
 370                                 }
 371                                 buf++;
 372                         }
 373                         c->port |= (1 << j);
 374                         if (u)
 375                                 c->untag |= (1 << j);
 376                         if (p)
 377                                 c->pvid |= (1 << j);
 378
 379                         j = 0;
 380                 }
 381
 382                 while (isspace(*buf)) buf++;
 383         }
 384         if (*buf != 0) {
 385                 kfree(c);
 386                 return NULL;
 387         }
 388
 389         c->port &= (1 << driver->ports) - 1;
 390         c->untag &= (1 << driver->ports) - 1;
 391         c->pvid &= (1 << driver->ports) - 1;
 392
 393         return c;
 394 }
 395
 396
 397 int switch_device_registered (char* device) {
 398         struct list_head *pos;
 399
 400         list_for_each(pos, &drivers.list) {
 401                 if (strcmp(list_entry(pos, switch_driver, list)->interface, device) == 0) {
 402                         printk("There is already a switch registered on the device '%s'\n", device);
 403                         return -EINVAL;
 404                 }
 405         }
 406
 407         return 0;
 408 }
 409
 410
 411 int switch_register_driver(switch_driver *driver)
 412 {
 413         struct list_head *pos;
 414         switch_driver *new;
 415         int ret;
 416
 417         list_for_each(pos, &drivers.list) {
 418                 if (strcmp(list_entry(pos, switch_driver, list)->name, driver->name) == 0) {
 419                         printk("Switch driver '%s' already exists in the kernel\n", driver->name);
 420                         return -EINVAL;
 421                 }
 422                 if (strcmp(list_entry(pos, switch_driver, list)->interface, driver->interface) == 0) {
 423                         printk("There is already a switch registered on the device '%s'\n", driver->interface);
 424                         return -EINVAL;
 425                 }
 426         }
 427
 428         new = kmalloc(sizeof(switch_driver), GFP_KERNEL);
 429         if (!new)
 430                 return -ENOMEM;
 431         memcpy(new, driver, sizeof(switch_driver));
 432         new->name = strdup(driver->name);
 433         new->interface = strdup(driver->interface);
 434
 435         if ((ret = do_register(new)) < 0) {
 436                 kfree(new->name);
 437                 kfree(new);
 438                 return ret;
 439         }
 440         INIT_LIST_HEAD(&new->list);
 441         list_add(&new->list, &drivers.list);
 442
 443         return 0;
 444 }
 445
 446 void switch_unregister_driver(char *name) {
 447         struct list_head *pos, *q;
 448         switch_driver *tmp;
 449
 450         list_for_each_safe(pos, q, &drivers.list) {
 451                 tmp = list_entry(pos, switch_driver, list);
 452                 if (strcmp(tmp->name, name) == 0) {
 453                         do_unregister(tmp);
 454                         list_del(pos);
 455                         kfree(tmp->name);
 456                         kfree(tmp);
 457
 458                         return;
 459                 }
 460         }
 461 }
 462
 463 static int __init switch_init(void)
 464 {
 465         if ((switch_root = proc_mkdir("switch", NULL)) == NULL) {
 466                 printk("%s: proc_mkdir failed.\n", __FILE__);
 467                 return -ENODEV;
 468         }
 469
 470         INIT_LIST_HEAD(&drivers.list);
 471
 472         return 0;
 473 }
 474
 475 static void __exit switch_exit(void)
 476 {
 477         remove_proc_entry("switch", NULL);
 478 }
 479
 480 MODULE_AUTHOR("Felix Fietkau <openwrt@nbd.name>");
 481 MODULE_LICENSE("GPL");
 482
 483 EXPORT_SYMBOL(switch_device_registered);
 484 EXPORT_SYMBOL(switch_register_driver);
 485 EXPORT_SYMBOL(switch_unregister_driver);
 486 EXPORT_SYMBOL(switch_parse_vlan);
 487 EXPORT_SYMBOL(switch_parse_media);
 488 EXPORT_SYMBOL(switch_print_media);
 489
 490 module_init(switch_init);
 491 module_exit(switch_exit);