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", "1000FD", "1000HD", "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 int handle_driver_cpuport(void *driver, char *buf, int nr)
 142 {
 143         int cpuport = ((switch_driver *) driver)->cpuport;
 144         return sprintf(buf, "%i\n", cpuport);
 145 }
 146
 147 static int handle_driver_ports(void *driver, char *buf, int nr)
 148 {
 149         int ports = ((switch_driver *) driver)->ports;
 150         return sprintf(buf, "%i\n", ports);
 151 }
 152
 153 static int handle_driver_vlans(void *driver, char *buf, int nr)
 154 {
 155         int vlans = ((switch_driver *) driver)->vlans;
 156         return sprintf(buf, "%i\n", vlans);
 157 }
 158
 159 static void add_handler(switch_driver *driver, const 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         if (!tmp)
 168                 return;
 169         INIT_LIST_HEAD(&tmp->list);
 170         tmp->parent = parent;
 171         tmp->nr = nr;
 172         tmp->driver = driver;
 173         memcpy(&tmp->handler, handler, sizeof(switch_config));
 174         list_add(&tmp->list, &priv->data.list);
 175
 176         mode = 0;
 177         if (handler->read != NULL) mode |= S_IRUSR;
 178         if (handler->write != NULL) mode |= S_IWUSR;
 179
 180         if ((p = create_proc_entry(handler->name, mode, parent)) != NULL) {
 181                 p->data = (void *) tmp;
 182                 p->proc_fops = &switch_proc_fops;
 183         }
 184 }
 185
 186 static inline void add_handlers(switch_driver *driver, const switch_config *handlers, struct proc_dir_entry *parent, int nr)
 187 {
 188         int i;
 189
 190         for (i = 0; handlers[i].name != NULL; i++) {
 191                 add_handler(driver, &(handlers[i]), parent, nr);
 192         }
 193 }
 194
 195 static void remove_handlers(switch_priv *priv)
 196 {
 197         struct list_head *pos, *q;
 198         switch_proc_handler *tmp;
 199
 200         list_for_each_safe(pos, q, &priv->data.list) {
 201                 tmp = list_entry(pos, switch_proc_handler, list);
 202                 list_del(pos);
 203                 remove_proc_entry(tmp->handler.name, tmp->parent);
 204                 kfree(tmp);
 205         }
 206 }
 207
 208
 209 static void do_unregister(switch_driver *driver)
 210 {
 211         char buf[4];
 212         int i;
 213         switch_priv *priv = (switch_priv *) driver->data;
 214
 215         remove_handlers(priv);
 216
 217         for(i = 0; priv->ports[i] != NULL; i++) {
 218                 sprintf(buf, "%d", i);
 219                 remove_proc_entry(buf, priv->port_dir);
 220         }
 221         kfree(priv->ports);
 222         remove_proc_entry("port", priv->driver_dir);
 223
 224         for(i = 0; priv->vlans[i] != NULL; i++) {
 225                 sprintf(buf, "%d", i);
 226                 remove_proc_entry(buf, priv->vlan_dir);
 227         }
 228         kfree(priv->vlans);
 229         remove_proc_entry("vlan", priv->driver_dir);
 230
 231         remove_proc_entry(driver->interface, switch_root);
 232
 233         if (priv->nr == (drv_num - 1))
 234                 drv_num--;
 235
 236         kfree(priv);
 237 }
 238
 239 switch_config global_driver_handlers[] = {
 240         {"driver", handle_driver_name, NULL},
 241         {"version", handle_driver_version, NULL},
 242         {"cpuport", handle_driver_cpuport, NULL},
 243         {"ports", handle_driver_ports, NULL},
 244         {"vlans", handle_driver_vlans, NULL},
 245         {NULL, NULL, NULL}
 246 };
 247
 248 static int do_register(switch_driver *driver)
 249 {
 250         switch_priv *priv;
 251         int i;
 252         char buf[4];
 253
 254         priv = kmalloc(sizeof(switch_priv), GFP_KERNEL);
 255         if (!priv)
 256                 return -ENOMEM;
 257         driver->data = (void *) priv;
 258
 259         priv->ports = kmalloc((driver->ports + 1) * sizeof(struct proc_dir_entry *),
 260                               GFP_KERNEL);
 261         if (!priv->ports) {
 262                 kfree(priv);
 263                 return -ENOMEM;
 264         }
 265         priv->vlans = kmalloc((driver->vlans + 1) * sizeof(struct proc_dir_entry *),
 266                               GFP_KERNEL);
 267         if (!priv->vlans) {
 268                 kfree(priv->ports);
 269                 kfree(priv);
 270                 return -ENOMEM;
 271         }
 272
 273         INIT_LIST_HEAD(&priv->data.list);
 274
 275         priv->nr = drv_num++;
 276         priv->driver_dir = proc_mkdir(driver->interface, switch_root);
 277         if (driver->driver_handlers != NULL) {
 278                 add_handlers(driver, driver->driver_handlers, priv->driver_dir, 0);
 279                 add_handlers(driver, global_driver_handlers, priv->driver_dir, 0);
 280         }
 281
 282         priv->port_dir = proc_mkdir("port", priv->driver_dir);
 283         for (i = 0; i < driver->ports; i++) {
 284                 sprintf(buf, "%d", i);
 285                 priv->ports[i] = proc_mkdir(buf, priv->port_dir);
 286                 if (driver->port_handlers != NULL)
 287                         add_handlers(driver, driver->port_handlers, priv->ports[i], i);
 288         }
 289         priv->ports[i] = NULL;
 290
 291         priv->vlan_dir = proc_mkdir("vlan", priv->driver_dir);
 292         for (i = 0; i < driver->vlans; i++) {
 293                 sprintf(buf, "%d", i);
 294                 priv->vlans[i] = proc_mkdir(buf, priv->vlan_dir);
 295                 if (driver->vlan_handlers != NULL)
 296                         add_handlers(driver, driver->vlan_handlers, priv->vlans[i], i);
 297         }
 298         priv->vlans[i] = NULL;
 299
 300
 301         return 0;
 302 }
 303
 304 static inline int isspace(char c) {
 305         switch(c) {
 306                 case ' ':
 307                 case 0x09:
 308                 case 0x0a:
 309                 case 0x0d:
 310                         return 1;
 311                 default:
 312                         return 0;
 313         }
 314 }
 315
 316 #define toupper(c) (islower(c) ? ((c) ^ 0x20) : (c))
 317 #define islower(c) (((unsigned char)((c) - 'a')) < 26)
 318
 319 int switch_parse_media(char *buf)
 320 {
 321         char *str = buf;
 322         while (*buf != 0) {
 323                 *buf = toupper(*buf);
 324                 buf++;
 325         }
 326
 327         if (strncmp(str, "AUTO", 4) == 0)
 328                 return SWITCH_MEDIA_AUTO;
 329         else if (strncmp(str, "1000FD", 6) == 0)
 330                 return SWITCH_MEDIA_1000 | SWITCH_MEDIA_FD;
 331         else if (strncmp(str, "1000HD", 6) == 0)
 332                 return SWITCH_MEDIA_1000;
 333         else if (strncmp(str, "100FD", 5) == 0)
 334                 return SWITCH_MEDIA_100 | SWITCH_MEDIA_FD;
 335         else if (strncmp(str, "100HD", 5) == 0)
 336                 return SWITCH_MEDIA_100;
 337         else if (strncmp(str, "10FD", 4) == 0)
 338                 return SWITCH_MEDIA_FD;
 339         else if (strncmp(str, "10HD", 4) == 0)
 340                 return 0;
 341         else return -1;
 342 }
 343
 344 int switch_print_media(char *buf, int media)
 345 {
 346         int len = 0;
 347
 348         if (media & SWITCH_MEDIA_AUTO)
 349                 len = sprintf(buf, "Auto");
 350         else if (media == (SWITCH_MEDIA_1000 | SWITCH_MEDIA_FD))
 351                 len = sprintf(buf, "1000FD");
 352         else if (media == SWITCH_MEDIA_1000)
 353                 len = sprintf(buf, "1000HD");
 354         else if (media == (SWITCH_MEDIA_100 | SWITCH_MEDIA_FD))
 355                 len = sprintf(buf, "100FD");
 356         else if (media == SWITCH_MEDIA_100)
 357                 len = sprintf(buf, "100HD");
 358         else if (media == SWITCH_MEDIA_FD)
 359                 len = sprintf(buf, "10FD");
 360         else if (media == 0)
 361                 len = sprintf(buf, "10HD");
 362         else
 363                 len = sprintf(buf, "Invalid");
 364
 365         return len;
 366 }
 367
 368 switch_vlan_config *switch_parse_vlan(switch_driver *driver, char *buf)
 369 {
 370         switch_vlan_config *c;
 371         int j, u, p, s;
 372
 373         c = kzalloc(sizeof(switch_vlan_config), GFP_KERNEL);
 374         if (!c)
 375                 return NULL;
 376
 377         while (isspace(*buf)) buf++;
 378         j = 0;
 379         while (*buf >= '0' && *buf <= '9') {
 380                 j *= 10;
 381                 j += *buf++ - '0';
 382
 383                 u = ((j == driver->cpuport) ? 0 : 1);
 384                 p = 0;
 385                 s = !(*buf >= '0' && *buf <= '9');
 386
 387                 if (s) {
 388                         while (s && !isspace(*buf) && (*buf != 0)) {
 389                                 switch(*buf) {
 390                                         case 'u':
 391                                                 u = 1;
 392                                                 break;
 393                                         case 't':
 394                                                 u = 0;
 395                                                 break;
 396                                         case '*':
 397                                                 p = 1;
 398                                                 break;
 399                                 }
 400                                 buf++;
 401                         }
 402                         c->port |= (1 << j);
 403                         if (u)
 404                                 c->untag |= (1 << j);
 405                         if (p)
 406                                 c->pvid |= (1 << j);
 407
 408                         j = 0;
 409                 }
 410
 411                 while (isspace(*buf)) buf++;
 412         }
 413         if (*buf != 0) {
 414                 kfree(c);
 415                 return NULL;
 416         }
 417
 418         c->port &= (1 << driver->ports) - 1;
 419         c->untag &= (1 << driver->ports) - 1;
 420         c->pvid &= (1 << driver->ports) - 1;
 421
 422         return c;
 423 }
 424
 425
 426 int switch_device_registered (char* device) {
 427         struct list_head *pos;
 428
 429         list_for_each(pos, &drivers.list) {
 430                 if (strcmp(list_entry(pos, switch_driver, list)->interface, device) == 0) {
 431                         printk("There is already a switch registered on the device '%s'\n", device);
 432                         return -EINVAL;
 433                 }
 434         }
 435
 436         return 0;
 437 }
 438
 439
 440 int switch_register_driver(switch_driver *driver)
 441 {
 442         struct list_head *pos;
 443         switch_driver *new;
 444         int ret;
 445
 446         list_for_each(pos, &drivers.list) {
 447                 if (strcmp(list_entry(pos, switch_driver, list)->name, driver->name) == 0) {
 448                         printk("Switch driver '%s' already exists in the kernel\n", driver->name);
 449                         return -EINVAL;
 450                 }
 451                 if (strcmp(list_entry(pos, switch_driver, list)->interface, driver->interface) == 0) {
 452                         printk("There is already a switch registered on the device '%s'\n", driver->interface);
 453                         return -EINVAL;
 454                 }
 455         }
 456
 457         new = kmalloc(sizeof(switch_driver), GFP_KERNEL);
 458         if (!new)
 459                 return -ENOMEM;
 460         memcpy(new, driver, sizeof(switch_driver));
 461         new->name = strdup(driver->name);
 462         new->interface = strdup(driver->interface);
 463
 464         if ((ret = do_register(new)) < 0) {
 465                 kfree(new->name);
 466                 kfree(new);
 467                 return ret;
 468         }
 469         INIT_LIST_HEAD(&new->list);
 470         list_add(&new->list, &drivers.list);
 471
 472         return 0;
 473 }
 474
 475 void switch_unregister_driver(char *name) {
 476         struct list_head *pos, *q;
 477         switch_driver *tmp;
 478
 479         list_for_each_safe(pos, q, &drivers.list) {
 480                 tmp = list_entry(pos, switch_driver, list);
 481                 if (strcmp(tmp->name, name) == 0) {
 482                         do_unregister(tmp);
 483                         list_del(pos);
 484                         kfree(tmp->name);
 485                         kfree(tmp);
 486
 487                         return;
 488                 }
 489         }
 490 }
 491
 492 static int __init switch_init(void)
 493 {
 494         if ((switch_root = proc_mkdir("switch", NULL)) == NULL) {
 495                 printk("%s: proc_mkdir failed.\n", __FILE__);
 496                 return -ENODEV;
 497         }
 498
 499         INIT_LIST_HEAD(&drivers.list);
 500
 501         return 0;
 502 }
 503
 504 static void __exit switch_exit(void)
 505 {
 506         remove_proc_entry("switch", NULL);
 507 }
 508
 509 MODULE_AUTHOR("Felix Fietkau <openwrt@nbd.name>");
 510 MODULE_LICENSE("GPL");
 511
 512 EXPORT_SYMBOL(switch_device_registered);
 513 EXPORT_SYMBOL(switch_register_driver);
 514 EXPORT_SYMBOL(switch_unregister_driver);
 515 EXPORT_SYMBOL(switch_parse_vlan);
 516 EXPORT_SYMBOL(switch_parse_media);
 517 EXPORT_SYMBOL(switch_print_media);
 518
 519 module_init(switch_init);
 520 module_exit(switch_exit);