net/bridge/br_ioctl.c

   1 /*
   2  *      Ioctl handler
   3  *      Linux ethernet bridge
   4  *
   5  *      Authors:
   6  *      Lennert Buytenhek               <buytenh@gnu.org>
   7  *
   8  *      $Id: br_ioctl.c,v 1.4 2000/11/08 05:16:40 davem Exp $
   9  *
  10  *      This program is free software; you can redistribute it and/or
  11  *      modify it under the terms of the GNU General Public License
  12  *      as published by the Free Software Foundation; either version
  13  *      2 of the License, or (at your option) any later version.
  14  */
  15
  16 #include <linux/capability.h>
  17 #include <linux/kernel.h>
  18 #include <linux/if_bridge.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/times.h>
  21 #include <asm/uaccess.h>
  22 #include "br_private.h"
  23
  24 /* called with RTNL */
  25 static int get_bridge_ifindices(int *indices, int num)
  26 {
  27         struct net_device *dev;
  28         int i = 0;
  29
  30         for_each_netdev(dev) {
  31                 if (i >= num)
  32                         break;
  33                 if (dev->priv_flags & IFF_EBRIDGE)
  34                         indices[i++] = dev->ifindex;
  35         }
  36
  37         return i;
  38 }
  39
  40 /* called with RTNL */
  41 static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
  42 {
  43         struct net_bridge_port *p;
  44
  45         list_for_each_entry(p, &br->port_list, list) {
  46                 if (p->port_no < num)
  47                         ifindices[p->port_no] = p->dev->ifindex;
  48         }
  49 }
  50
  51 /*
  52  * Format up to a page worth of forwarding table entries
  53  * userbuf -- where to copy result
  54  * maxnum  -- maximum number of entries desired
  55  *            (limited to a page for sanity)
  56  * offset  -- number of records to skip
  57  */
  58 static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
  59                            unsigned long maxnum, unsigned long offset)
  60 {
  61         int num;
  62         void *buf;
  63         size_t size;
  64
  65         /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
  66         if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
  67                 maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
  68
  69         size = maxnum * sizeof(struct __fdb_entry);
  70
  71         buf = kmalloc(size, GFP_USER);
  72         if (!buf)
  73                 return -ENOMEM;
  74
  75         num = br_fdb_fillbuf(br, buf, maxnum, offset);
  76         if (num > 0) {
  77                 if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
  78                         num = -EFAULT;
  79         }
  80         kfree(buf);
  81
  82         return num;
  83 }
  84
  85 static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
  86 {
  87         struct net_device *dev;
  88         int ret;
  89
  90         if (!capable(CAP_NET_ADMIN))
  91                 return -EPERM;
  92
  93         dev = dev_get_by_index(ifindex);
  94         if (dev == NULL)
  95                 return -EINVAL;
  96
  97         if (isadd)
  98                 ret = br_add_if(br, dev);
  99         else
 100                 ret = br_del_if(br, dev);
 101
 102         dev_put(dev);
 103         return ret;
 104 }
 105
 106 /*
 107  * Legacy ioctl's through SIOCDEVPRIVATE
 108  * This interface is deprecated because it was too difficult to
 109  * to do the translation for 32/64bit ioctl compatability.
 110  */
 111 static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 112 {
 113         struct net_bridge *br = netdev_priv(dev);
 114         unsigned long args[4];
 115
 116         if (copy_from_user(args, rq->ifr_data, sizeof(args)))
 117                 return -EFAULT;
 118
 119         switch (args[0]) {
 120         case BRCTL_ADD_IF:
 121         case BRCTL_DEL_IF:
 122                 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
 123
 124         case BRCTL_GET_BRIDGE_INFO:
 125         {
 126                 struct __bridge_info b;
 127
 128                 memset(&b, 0, sizeof(struct __bridge_info));
 129                 rcu_read_lock();
 130                 memcpy(&b.designated_root, &br->designated_root, 8);
 131                 memcpy(&b.bridge_id, &br->bridge_id, 8);
 132                 b.root_path_cost = br->root_path_cost;
 133                 b.max_age = jiffies_to_clock_t(br->max_age);
 134                 b.hello_time = jiffies_to_clock_t(br->hello_time);
 135                 b.forward_delay = br->forward_delay;
 136                 b.bridge_max_age = br->bridge_max_age;
 137                 b.bridge_hello_time = br->bridge_hello_time;
 138                 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
 139                 b.topology_change = br->topology_change;
 140                 b.topology_change_detected = br->topology_change_detected;
 141                 b.root_port = br->root_port;
 142
 143                 b.stp_enabled = (br->stp_enabled != BR_NO_STP);
 144                 b.ageing_time = jiffies_to_clock_t(br->ageing_time);
 145                 b.hello_timer_value = br_timer_value(&br->hello_timer);
 146                 b.tcn_timer_value = br_timer_value(&br->tcn_timer);
 147                 b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
 148                 b.gc_timer_value = br_timer_value(&br->gc_timer);
 149                 rcu_read_unlock();
 150
 151                 if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
 152                         return -EFAULT;
 153
 154                 return 0;
 155         }
 156
 157         case BRCTL_GET_PORT_LIST:
 158         {
 159                 int num, *indices;
 160
 161                 num = args[2];
 162                 if (num < 0)
 163                         return -EINVAL;
 164                 if (num == 0)
 165                         num = 256;
 166                 if (num > BR_MAX_PORTS)
 167                         num = BR_MAX_PORTS;
 168
 169                 indices = kcalloc(num, sizeof(int), GFP_KERNEL);
 170                 if (indices == NULL)
 171                         return -ENOMEM;
 172
 173                 get_port_ifindices(br, indices, num);
 174                 if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
 175                         num =  -EFAULT;
 176                 kfree(indices);
 177                 return num;
 178         }
 179
 180         case BRCTL_SET_BRIDGE_FORWARD_DELAY:
 181                 if (!capable(CAP_NET_ADMIN))
 182                         return -EPERM;
 183
 184                 spin_lock_bh(&br->lock);
 185                 br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
 186                 if (br_is_root_bridge(br))
 187                         br->forward_delay = br->bridge_forward_delay;
 188                 spin_unlock_bh(&br->lock);
 189                 return 0;
 190
 191         case BRCTL_SET_BRIDGE_HELLO_TIME:
 192                 if (!capable(CAP_NET_ADMIN))
 193                         return -EPERM;
 194
 195                 spin_lock_bh(&br->lock);
 196                 br->bridge_hello_time = clock_t_to_jiffies(args[1]);
 197                 if (br_is_root_bridge(br))
 198                         br->hello_time = br->bridge_hello_time;
 199                 spin_unlock_bh(&br->lock);
 200                 return 0;
 201
 202         case BRCTL_SET_BRIDGE_MAX_AGE:
 203                 if (!capable(CAP_NET_ADMIN))
 204                         return -EPERM;
 205
 206                 spin_lock_bh(&br->lock);
 207                 br->bridge_max_age = clock_t_to_jiffies(args[1]);
 208                 if (br_is_root_bridge(br))
 209                         br->max_age = br->bridge_max_age;
 210                 spin_unlock_bh(&br->lock);
 211                 return 0;
 212
 213         case BRCTL_SET_AGEING_TIME:
 214                 if (!capable(CAP_NET_ADMIN))
 215                         return -EPERM;
 216
 217                 br->ageing_time = clock_t_to_jiffies(args[1]);
 218                 return 0;
 219
 220         case BRCTL_GET_PORT_INFO:
 221         {
 222                 struct __port_info p;
 223                 struct net_bridge_port *pt;
 224
 225                 rcu_read_lock();
 226                 if ((pt = br_get_port(br, args[2])) == NULL) {
 227                         rcu_read_unlock();
 228                         return -EINVAL;
 229                 }
 230
 231                 memset(&p, 0, sizeof(struct __port_info));
 232                 memcpy(&p.designated_root, &pt->designated_root, 8);
 233                 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
 234                 p.port_id = pt->port_id;
 235                 p.designated_port = pt->designated_port;
 236                 p.path_cost = pt->path_cost;
 237                 p.designated_cost = pt->designated_cost;
 238                 p.state = pt->state;
 239                 p.top_change_ack = pt->topology_change_ack;
 240                 p.config_pending = pt->config_pending;
 241                 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
 242                 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
 243                 p.hold_timer_value = br_timer_value(&pt->hold_timer);
 244
 245                 rcu_read_unlock();
 246
 247                 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
 248                         return -EFAULT;
 249
 250                 return 0;
 251         }
 252
 253         case BRCTL_SET_BRIDGE_STP_STATE:
 254                 if (!capable(CAP_NET_ADMIN))
 255                         return -EPERM;
 256
 257                 br_stp_set_enabled(br, args[1]);
 258                 return 0;
 259
 260         case BRCTL_SET_BRIDGE_PRIORITY:
 261                 if (!capable(CAP_NET_ADMIN))
 262                         return -EPERM;
 263
 264                 spin_lock_bh(&br->lock);
 265                 br_stp_set_bridge_priority(br, args[1]);
 266                 spin_unlock_bh(&br->lock);
 267                 return 0;
 268
 269         case BRCTL_SET_PORT_PRIORITY:
 270         {
 271                 struct net_bridge_port *p;
 272                 int ret = 0;
 273
 274                 if (!capable(CAP_NET_ADMIN))
 275                         return -EPERM;
 276
 277                 if (args[2] >= (1<<(16-BR_PORT_BITS)))
 278                         return -ERANGE;
 279
 280                 spin_lock_bh(&br->lock);
 281                 if ((p = br_get_port(br, args[1])) == NULL)
 282                         ret = -EINVAL;
 283                 else
 284                         br_stp_set_port_priority(p, args[2]);
 285                 spin_unlock_bh(&br->lock);
 286                 return ret;
 287         }
 288
 289         case BRCTL_SET_PATH_COST:
 290         {
 291                 struct net_bridge_port *p;
 292                 int ret = 0;
 293
 294                 if (!capable(CAP_NET_ADMIN))
 295                         return -EPERM;
 296
 297                 if ((p = br_get_port(br, args[1])) == NULL)
 298                         ret = -EINVAL;
 299                 else
 300                         br_stp_set_path_cost(p, args[2]);
 301
 302                 return ret;
 303         }
 304
 305         case BRCTL_GET_FDB_ENTRIES:
 306                 return get_fdb_entries(br, (void __user *)args[1],
 307                                        args[2], args[3]);
 308         }
 309
 310         return -EOPNOTSUPP;
 311 }
 312
 313 static int old_deviceless(void __user *uarg)
 314 {
 315         unsigned long args[3];
 316
 317         if (copy_from_user(args, uarg, sizeof(args)))
 318                 return -EFAULT;
 319
 320         switch (args[0]) {
 321         case BRCTL_GET_VERSION:
 322                 return BRCTL_VERSION;
 323
 324         case BRCTL_GET_BRIDGES:
 325         {
 326                 int *indices;
 327                 int ret = 0;
 328
 329                 if (args[2] >= 2048)
 330                         return -ENOMEM;
 331                 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
 332                 if (indices == NULL)
 333                         return -ENOMEM;
 334
 335                 args[2] = get_bridge_ifindices(indices, args[2]);
 336
 337                 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
 338                         ? -EFAULT : args[2];
 339
 340                 kfree(indices);
 341                 return ret;
 342         }
 343
 344         case BRCTL_ADD_BRIDGE:
 345         case BRCTL_DEL_BRIDGE:
 346         {
 347                 char buf[IFNAMSIZ];
 348
 349                 if (!capable(CAP_NET_ADMIN))
 350                         return -EPERM;
 351
 352                 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
 353                         return -EFAULT;
 354
 355                 buf[IFNAMSIZ-1] = 0;
 356
 357                 if (args[0] == BRCTL_ADD_BRIDGE)
 358                         return br_add_bridge(buf);
 359
 360                 return br_del_bridge(buf);
 361         }
 362         }
 363
 364         return -EOPNOTSUPP;
 365 }
 366
 367 int br_ioctl_deviceless_stub(unsigned int cmd, void __user *uarg)
 368 {
 369         switch (cmd) {
 370         case SIOCGIFBR:
 371         case SIOCSIFBR:
 372                 return old_deviceless(uarg);
 373
 374         case SIOCBRADDBR:
 375         case SIOCBRDELBR:
 376         {
 377                 char buf[IFNAMSIZ];
 378
 379                 if (!capable(CAP_NET_ADMIN))
 380                         return -EPERM;
 381
 382                 if (copy_from_user(buf, uarg, IFNAMSIZ))
 383                         return -EFAULT;
 384
 385                 buf[IFNAMSIZ-1] = 0;
 386                 if (cmd == SIOCBRADDBR)
 387                         return br_add_bridge(buf);
 388
 389                 return br_del_bridge(buf);
 390         }
 391         }
 392         return -EOPNOTSUPP;
 393 }
 394
 395 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 396 {
 397         struct net_bridge *br = netdev_priv(dev);
 398
 399         switch(cmd) {
 400         case SIOCDEVPRIVATE:
 401                 return old_dev_ioctl(dev, rq, cmd);
 402
 403         case SIOCBRADDIF:
 404         case SIOCBRDELIF:
 405                 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
 406
 407         }
 408
 409         pr_debug("Bridge does not support ioctl 0x%x\n", cmd);
 410         return -EOPNOTSUPP;
 411 }