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