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 (dev = dev_base; dev && i < num; dev = dev->next) {
  31                 if (dev->priv_flags & IFF_EBRIDGE)
  32                         indices[i++] = dev->ifindex;
  33         }
  34
  35         return i;
  36 }
  37
  38 /* called with RTNL */
  39 static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
  40 {
  41         struct net_bridge_port *p;
  42
  43         list_for_each_entry(p, &br->port_list, list) {
  44                 if (p->port_no < num)
  45                         ifindices[p->port_no] = p->dev->ifindex;
  46         }
  47 }
  48
  49 /*
  50  * Format up to a page worth of forwarding table entries
  51  * userbuf -- where to copy result
  52  * maxnum  -- maximum number of entries desired
  53  *            (limited to a page for sanity)
  54  * offset  -- number of records to skip
  55  */
  56 static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
  57                            unsigned long maxnum, unsigned long offset)
  58 {
  59         int num;
  60         void *buf;
  61         size_t size;
  62
  63         /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
  64         if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
  65                 maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
  66
  67         size = maxnum * sizeof(struct __fdb_entry);
  68
  69         buf = kmalloc(size, GFP_USER);
  70         if (!buf)
  71                 return -ENOMEM;
  72
  73         num = br_fdb_fillbuf(br, buf, maxnum, offset);
  74         if (num > 0) {
  75                 if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
  76                         num = -EFAULT;
  77         }
  78         kfree(buf);
  79
  80         return num;
  81 }
  82
  83 static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
  84 {
  85         struct net_device *dev;
  86         int ret;
  87
  88         if (!capable(CAP_NET_ADMIN))
  89                 return -EPERM;
  90
  91         dev = dev_get_by_index(ifindex);
  92         if (dev == NULL)
  93                 return -EINVAL;
  94
  95         if (isadd)
  96                 ret = br_add_if(br, dev);
  97         else
  98                 ret = br_del_if(br, dev);
  99
 100         dev_put(dev);
 101         return ret;
 102 }
 103
 104 /*
 105  * Legacy ioctl's through SIOCDEVPRIVATE
 106  * This interface is deprecated because it was too difficult to
 107  * to do the translation for 32/64bit ioctl compatability.
 108  */
 109 static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 110 {
 111         struct net_bridge *br = netdev_priv(dev);
 112         unsigned long args[4];
 113
 114         if (copy_from_user(args, rq->ifr_data, sizeof(args)))
 115                 return -EFAULT;
 116
 117         switch (args[0]) {
 118         case BRCTL_ADD_IF:
 119         case BRCTL_DEL_IF:
 120                 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
 121
 122         case BRCTL_GET_BRIDGE_INFO:
 123         {
 124                 struct __bridge_info b;
 125
 126                 memset(&b, 0, sizeof(struct __bridge_info));
 127                 rcu_read_lock();
 128                 memcpy(&b.designated_root, &br->designated_root, 8);
 129                 memcpy(&b.bridge_id, &br->bridge_id, 8);
 130                 b.root_path_cost = br->root_path_cost;
 131                 b.max_age = jiffies_to_clock_t(br->max_age);
 132                 b.hello_time = jiffies_to_clock_t(br->hello_time);
 133                 b.forward_delay = br->forward_delay;
 134                 b.bridge_max_age = br->bridge_max_age;
 135                 b.bridge_hello_time = br->bridge_hello_time;
 136                 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
 137                 b.topology_change = br->topology_change;
 138                 b.topology_change_detected = br->topology_change_detected;
 139                 b.root_port = br->root_port;
 140                 b.stp_enabled = br->stp_enabled;
 141                 b.ageing_time = jiffies_to_clock_t(br->ageing_time);
 142                 b.hello_timer_value = br_timer_value(&br->hello_timer);
 143                 b.tcn_timer_value = br_timer_value(&br->tcn_timer);
 144                 b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
 145                 b.gc_timer_value = br_timer_value(&br->gc_timer);
 146                 rcu_read_unlock();
 147
 148                 if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
 149                         return -EFAULT;
 150
 151                 return 0;
 152         }
 153
 154         case BRCTL_GET_PORT_LIST:
 155         {
 156                 int num, *indices;
 157
 158                 num = args[2];
 159                 if (num < 0)
 160                         return -EINVAL;
 161                 if (num == 0)
 162                         num = 256;
 163                 if (num > BR_MAX_PORTS)
 164                         num = BR_MAX_PORTS;
 165
 166                 indices = kcalloc(num, sizeof(int), GFP_KERNEL);
 167                 if (indices == NULL)
 168                         return -ENOMEM;
 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 = kcalloc(args[2], sizeof(int), GFP_KERNEL);
 330                 if (indices == NULL)
 331                         return -ENOMEM;
 332
 333                 args[2] = get_bridge_ifindices(indices, args[2]);
 334
 335                 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
 336                         ? -EFAULT : args[2];
 337
 338                 kfree(indices);
 339                 return ret;
 340         }
 341
 342         case BRCTL_ADD_BRIDGE:
 343         case BRCTL_DEL_BRIDGE:
 344         {
 345                 char buf[IFNAMSIZ];
 346
 347                 if (!capable(CAP_NET_ADMIN))
 348                         return -EPERM;
 349
 350                 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
 351                         return -EFAULT;
 352
 353                 buf[IFNAMSIZ-1] = 0;
 354
 355                 if (args[0] == BRCTL_ADD_BRIDGE)
 356                         return br_add_bridge(buf);
 357
 358                 return br_del_bridge(buf);
 359         }
 360         }
 361
 362         return -EOPNOTSUPP;
 363 }
 364
 365 int br_ioctl_deviceless_stub(unsigned int cmd, void __user *uarg)
 366 {
 367         switch (cmd) {
 368         case SIOCGIFBR:
 369         case SIOCSIFBR:
 370                 return old_deviceless(uarg);
 371
 372         case SIOCBRADDBR:
 373         case SIOCBRDELBR:
 374         {
 375                 char buf[IFNAMSIZ];
 376
 377                 if (!capable(CAP_NET_ADMIN))
 378                         return -EPERM;
 379
 380                 if (copy_from_user(buf, uarg, IFNAMSIZ))
 381                         return -EFAULT;
 382
 383                 buf[IFNAMSIZ-1] = 0;
 384                 if (cmd == SIOCBRADDBR)
 385                         return br_add_bridge(buf);
 386
 387                 return br_del_bridge(buf);
 388         }
 389         }
 390         return -EOPNOTSUPP;
 391 }
 392
 393 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 394 {
 395         struct net_bridge *br = netdev_priv(dev);
 396
 397         switch(cmd) {
 398         case SIOCDEVPRIVATE:
 399                 return old_dev_ioctl(dev, rq, cmd);
 400
 401         case SIOCBRADDIF:
 402         case SIOCBRDELIF:
 403                 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
 404
 405         }
 406
 407         pr_debug("Bridge does not support ioctl 0x%x\n", cmd);
 408         return -EOPNOTSUPP;
 409 }