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 <net/net_namespace.h>
  22 #include <asm/uaccess.h>
  23 #include "br_private.h"
  24
  25 /* called with RTNL */
  26 static int get_bridge_ifindices(int *indices, int num)
  27 {
  28         struct net_device *dev;
  29         int i = 0;
  30
  31         for_each_netdev(&init_net, dev) {
  32                 if (i >= num)
  33                         break;
  34                 if (dev->priv_flags & IFF_EBRIDGE)
  35                         indices[i++] = dev->ifindex;
  36         }
  37
  38         return i;
  39 }
  40
  41 /* called with RTNL */
  42 static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
  43 {
  44         struct net_bridge_port *p;
  45
  46         list_for_each_entry(p, &br->port_list, list) {
  47                 if (p->port_no < num)
  48                         ifindices[p->port_no] = p->dev->ifindex;
  49         }
  50 }
  51
  52 /*
  53  * Format up to a page worth of forwarding table entries
  54  * userbuf -- where to copy result
  55  * maxnum  -- maximum number of entries desired
  56  *            (limited to a page for sanity)
  57  * offset  -- number of records to skip
  58  */
  59 static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
  60                            unsigned long maxnum, unsigned long offset)
  61 {
  62         int num;
  63         void *buf;
  64         size_t size;
  65
  66         /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
  67         if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
  68                 maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
  69
  70         size = maxnum * sizeof(struct __fdb_entry);
  71
  72         buf = kmalloc(size, GFP_USER);
  73         if (!buf)
  74                 return -ENOMEM;
  75
  76         num = br_fdb_fillbuf(br, buf, maxnum, offset);
  77         if (num > 0) {
  78                 if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
  79                         num = -EFAULT;
  80         }
  81         kfree(buf);
  82
  83         return num;
  84 }
  85
  86 static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
  87 {
  88         struct net_device *dev;
  89         int ret;
  90
  91         if (!capable(CAP_NET_ADMIN))
  92                 return -EPERM;
  93
  94         dev = dev_get_by_index(&init_net, ifindex);
  95         if (dev == NULL)
  96                 return -EINVAL;
  97
  98         if (isadd)
  99                 ret = br_add_if(br, dev);
 100         else
 101                 ret = br_del_if(br, dev);
 102
 103         dev_put(dev);
 104         return ret;
 105 }
 106
 107 /*
 108  * Legacy ioctl's through SIOCDEVPRIVATE
 109  * This interface is deprecated because it was too difficult to
 110  * to do the translation for 32/64bit ioctl compatability.
 111  */
 112 static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 113 {
 114         struct net_bridge *br = netdev_priv(dev);
 115         unsigned long args[4];
 116
 117         if (copy_from_user(args, rq->ifr_data, sizeof(args)))
 118                 return -EFAULT;
 119
 120         switch (args[0]) {
 121         case BRCTL_ADD_IF:
 122         case BRCTL_DEL_IF:
 123                 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
 124
 125         case BRCTL_GET_BRIDGE_INFO:
 126         {
 127                 struct __bridge_info b;
 128
 129                 memset(&b, 0, sizeof(struct __bridge_info));
 130                 rcu_read_lock();
 131                 memcpy(&b.designated_root, &br->designated_root, 8);
 132                 memcpy(&b.bridge_id, &br->bridge_id, 8);
 133                 b.root_path_cost = br->root_path_cost;
 134                 b.max_age = jiffies_to_clock_t(br->max_age);
 135                 b.hello_time = jiffies_to_clock_t(br->hello_time);
 136                 b.forward_delay = br->forward_delay;
 137                 b.bridge_max_age = br->bridge_max_age;
 138                 b.bridge_hello_time = br->bridge_hello_time;
 139                 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
 140                 b.topology_change = br->topology_change;
 141                 b.topology_change_detected = br->topology_change_detected;
 142                 b.root_port = br->root_port;
 143
 144                 b.stp_enabled = (br->stp_enabled != BR_NO_STP);
 145                 b.ageing_time = jiffies_to_clock_t(br->ageing_time);
 146                 b.hello_timer_value = br_timer_value(&br->hello_timer);
 147                 b.tcn_timer_value = br_timer_value(&br->tcn_timer);
 148                 b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
 149                 b.gc_timer_value = br_timer_value(&br->gc_timer);
 150                 rcu_read_unlock();
 151
 152                 if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
 153                         return -EFAULT;
 154
 155                 return 0;
 156         }
 157
 158         case BRCTL_GET_PORT_LIST:
 159         {
 160                 int num, *indices;
 161
 162                 num = args[2];
 163                 if (num < 0)
 164                         return -EINVAL;
 165                 if (num == 0)
 166                         num = 256;
 167                 if (num > BR_MAX_PORTS)
 168                         num = BR_MAX_PORTS;
 169
 170                 indices = kcalloc(num, sizeof(int), GFP_KERNEL);
 171                 if (indices == NULL)
 172                         return -ENOMEM;
 173
 174                 get_port_ifindices(br, indices, num);
 175                 if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
 176                         num =  -EFAULT;
 177                 kfree(indices);
 178                 return num;
 179         }
 180
 181         case BRCTL_SET_BRIDGE_FORWARD_DELAY:
 182                 if (!capable(CAP_NET_ADMIN))
 183                         return -EPERM;
 184
 185                 spin_lock_bh(&br->lock);
 186                 br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
 187                 if (br_is_root_bridge(br))
 188                         br->forward_delay = br->bridge_forward_delay;
 189                 spin_unlock_bh(&br->lock);
 190                 return 0;
 191
 192         case BRCTL_SET_BRIDGE_HELLO_TIME:
 193                 if (!capable(CAP_NET_ADMIN))
 194                         return -EPERM;
 195
 196                 spin_lock_bh(&br->lock);
 197                 br->bridge_hello_time = clock_t_to_jiffies(args[1]);
 198                 if (br_is_root_bridge(br))
 199                         br->hello_time = br->bridge_hello_time;
 200                 spin_unlock_bh(&br->lock);
 201                 return 0;
 202
 203         case BRCTL_SET_BRIDGE_MAX_AGE:
 204                 if (!capable(CAP_NET_ADMIN))
 205                         return -EPERM;
 206
 207                 spin_lock_bh(&br->lock);
 208                 br->bridge_max_age = clock_t_to_jiffies(args[1]);
 209                 if (br_is_root_bridge(br))
 210                         br->max_age = br->bridge_max_age;
 211                 spin_unlock_bh(&br->lock);
 212                 return 0;
 213
 214         case BRCTL_SET_AGEING_TIME:
 215                 if (!capable(CAP_NET_ADMIN))
 216                         return -EPERM;
 217
 218                 br->ageing_time = clock_t_to_jiffies(args[1]);
 219                 return 0;
 220
 221         case BRCTL_GET_PORT_INFO:
 222         {
 223                 struct __port_info p;
 224                 struct net_bridge_port *pt;
 225
 226                 rcu_read_lock();
 227                 if ((pt = br_get_port(br, args[2])) == NULL) {
 228                         rcu_read_unlock();
 229                         return -EINVAL;
 230                 }
 231
 232                 memset(&p, 0, sizeof(struct __port_info));
 233                 memcpy(&p.designated_root, &pt->designated_root, 8);
 234                 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
 235                 p.port_id = pt->port_id;
 236                 p.designated_port = pt->designated_port;
 237                 p.path_cost = pt->path_cost;
 238                 p.designated_cost = pt->designated_cost;
 239                 p.state = pt->state;
 240                 p.top_change_ack = pt->topology_change_ack;
 241                 p.config_pending = pt->config_pending;
 242                 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
 243                 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
 244                 p.hold_timer_value = br_timer_value(&pt->hold_timer);
 245
 246                 rcu_read_unlock();
 247
 248                 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
 249                         return -EFAULT;
 250
 251                 return 0;
 252         }
 253
 254         case BRCTL_SET_BRIDGE_STP_STATE:
 255                 if (!capable(CAP_NET_ADMIN))
 256                         return -EPERM;
 257
 258                 br_stp_set_enabled(br, args[1]);
 259                 return 0;
 260
 261         case BRCTL_SET_BRIDGE_PRIORITY:
 262                 if (!capable(CAP_NET_ADMIN))
 263                         return -EPERM;
 264
 265                 spin_lock_bh(&br->lock);
 266                 br_stp_set_bridge_priority(br, args[1]);
 267                 spin_unlock_bh(&br->lock);
 268                 return 0;
 269
 270         case BRCTL_SET_PORT_PRIORITY:
 271         {
 272                 struct net_bridge_port *p;
 273                 int ret = 0;
 274
 275                 if (!capable(CAP_NET_ADMIN))
 276                         return -EPERM;
 277
 278                 if (args[2] >= (1<<(16-BR_PORT_BITS)))
 279                         return -ERANGE;
 280
 281                 spin_lock_bh(&br->lock);
 282                 if ((p = br_get_port(br, args[1])) == NULL)
 283                         ret = -EINVAL;
 284                 else
 285                         br_stp_set_port_priority(p, args[2]);
 286                 spin_unlock_bh(&br->lock);
 287                 return ret;
 288         }
 289
 290         case BRCTL_SET_PATH_COST:
 291         {
 292                 struct net_bridge_port *p;
 293                 int ret = 0;
 294
 295                 if (!capable(CAP_NET_ADMIN))
 296                         return -EPERM;
 297
 298                 if ((p = br_get_port(br, args[1])) == NULL)
 299                         ret = -EINVAL;
 300                 else
 301                         br_stp_set_path_cost(p, args[2]);
 302
 303                 return ret;
 304         }
 305
 306         case BRCTL_GET_FDB_ENTRIES:
 307                 return get_fdb_entries(br, (void __user *)args[1],
 308                                        args[2], args[3]);
 309         }
 310
 311         return -EOPNOTSUPP;
 312 }
 313
 314 static int old_deviceless(void __user *uarg)
 315 {
 316         unsigned long args[3];
 317
 318         if (copy_from_user(args, uarg, sizeof(args)))
 319                 return -EFAULT;
 320
 321         switch (args[0]) {
 322         case BRCTL_GET_VERSION:
 323                 return BRCTL_VERSION;
 324
 325         case BRCTL_GET_BRIDGES:
 326         {
 327                 int *indices;
 328                 int ret = 0;
 329
 330                 if (args[2] >= 2048)
 331                         return -ENOMEM;
 332                 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
 333                 if (indices == NULL)
 334                         return -ENOMEM;
 335
 336                 args[2] = get_bridge_ifindices(indices, args[2]);
 337
 338                 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
 339                         ? -EFAULT : args[2];
 340
 341                 kfree(indices);
 342                 return ret;
 343         }
 344
 345         case BRCTL_ADD_BRIDGE:
 346         case BRCTL_DEL_BRIDGE:
 347         {
 348                 char buf[IFNAMSIZ];
 349
 350                 if (!capable(CAP_NET_ADMIN))
 351                         return -EPERM;
 352
 353                 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
 354                         return -EFAULT;
 355
 356                 buf[IFNAMSIZ-1] = 0;
 357
 358                 if (args[0] == BRCTL_ADD_BRIDGE)
 359                         return br_add_bridge(buf);
 360
 361                 return br_del_bridge(buf);
 362         }
 363         }
 364
 365         return -EOPNOTSUPP;
 366 }
 367
 368 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
 369 {
 370         switch (cmd) {
 371         case SIOCGIFBR:
 372         case SIOCSIFBR:
 373                 return old_deviceless(uarg);
 374
 375         case SIOCBRADDBR:
 376         case SIOCBRDELBR:
 377         {
 378                 char buf[IFNAMSIZ];
 379
 380                 if (!capable(CAP_NET_ADMIN))
 381                         return -EPERM;
 382
 383                 if (copy_from_user(buf, uarg, IFNAMSIZ))
 384                         return -EFAULT;
 385
 386                 buf[IFNAMSIZ-1] = 0;
 387                 if (cmd == SIOCBRADDBR)
 388                         return br_add_bridge(buf);
 389
 390                 return br_del_bridge(buf);
 391         }
 392         }
 393         return -EOPNOTSUPP;
 394 }
 395
 396 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 397 {
 398         struct net_bridge *br = netdev_priv(dev);
 399
 400         switch(cmd) {
 401         case SIOCDEVPRIVATE:
 402                 return old_dev_ioctl(dev, rq, cmd);
 403
 404         case SIOCBRADDIF:
 405         case SIOCBRDELIF:
 406                 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
 407
 408         }
 409
 410         pr_debug("Bridge does not support ioctl 0x%x\n", cmd);
 411         return -EOPNOTSUPP;
 412 }