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