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 = kmalloc(num*sizeof(int), GFP_KERNEL);
 167                 if (indices == NULL)
 168                         return -ENOMEM;
 169
 170                 memset(indices, 0, num*sizeof(int));
 171
 172                 get_port_ifindices(br, indices, num);
 173                 if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
 174                         num =  -EFAULT;
 175                 kfree(indices);
 176                 return num;
 177         }
 178
 179         case BRCTL_SET_BRIDGE_FORWARD_DELAY:
 180                 if (!capable(CAP_NET_ADMIN))
 181                         return -EPERM;
 182
 183                 spin_lock_bh(&br->lock);
 184                 br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
 185                 if (br_is_root_bridge(br))
 186                         br->forward_delay = br->bridge_forward_delay;
 187                 spin_unlock_bh(&br->lock);
 188                 return 0;
 189
 190         case BRCTL_SET_BRIDGE_HELLO_TIME:
 191                 if (!capable(CAP_NET_ADMIN))
 192                         return -EPERM;
 193
 194                 spin_lock_bh(&br->lock);
 195                 br->bridge_hello_time = clock_t_to_jiffies(args[1]);
 196                 if (br_is_root_bridge(br))
 197                         br->hello_time = br->bridge_hello_time;
 198                 spin_unlock_bh(&br->lock);
 199                 return 0;
 200
 201         case BRCTL_SET_BRIDGE_MAX_AGE:
 202                 if (!capable(CAP_NET_ADMIN))
 203                         return -EPERM;
 204
 205                 spin_lock_bh(&br->lock);
 206                 br->bridge_max_age = clock_t_to_jiffies(args[1]);
 207                 if (br_is_root_bridge(br))
 208                         br->max_age = br->bridge_max_age;
 209                 spin_unlock_bh(&br->lock);
 210                 return 0;
 211
 212         case BRCTL_SET_AGEING_TIME:
 213                 if (!capable(CAP_NET_ADMIN))
 214                         return -EPERM;
 215
 216                 br->ageing_time = clock_t_to_jiffies(args[1]);
 217                 return 0;
 218
 219         case BRCTL_GET_PORT_INFO:
 220         {
 221                 struct __port_info p;
 222                 struct net_bridge_port *pt;
 223
 224                 rcu_read_lock();
 225                 if ((pt = br_get_port(br, args[2])) == NULL) {
 226                         rcu_read_unlock();
 227                         return -EINVAL;
 228                 }
 229
 230                 memset(&p, 0, sizeof(struct __port_info));
 231                 memcpy(&p.designated_root, &pt->designated_root, 8);
 232                 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
 233                 p.port_id = pt->port_id;
 234                 p.designated_port = pt->designated_port;
 235                 p.path_cost = pt->path_cost;
 236                 p.designated_cost = pt->designated_cost;
 237                 p.state = pt->state;
 238                 p.top_change_ack = pt->topology_change_ack;
 239                 p.config_pending = pt->config_pending;
 240                 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
 241                 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
 242                 p.hold_timer_value = br_timer_value(&pt->hold_timer);
 243
 244                 rcu_read_unlock();
 245
 246                 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
 247                         return -EFAULT;
 248
 249                 return 0;
 250         }
 251
 252         case BRCTL_SET_BRIDGE_STP_STATE:
 253                 if (!capable(CAP_NET_ADMIN))
 254                         return -EPERM;
 255
 256                 br->stp_enabled = args[1]?1:0;
 257                 return 0;
 258
 259         case BRCTL_SET_BRIDGE_PRIORITY:
 260                 if (!capable(CAP_NET_ADMIN))
 261                         return -EPERM;
 262
 263                 spin_lock_bh(&br->lock);
 264                 br_stp_set_bridge_priority(br, args[1]);
 265                 spin_unlock_bh(&br->lock);
 266                 return 0;
 267
 268         case BRCTL_SET_PORT_PRIORITY:
 269         {
 270                 struct net_bridge_port *p;
 271                 int ret = 0;
 272
 273                 if (!capable(CAP_NET_ADMIN))
 274                         return -EPERM;
 275
 276                 if (args[2] >= (1<<(16-BR_PORT_BITS)))
 277                         return -ERANGE;
 278
 279                 spin_lock_bh(&br->lock);
 280                 if ((p = br_get_port(br, args[1])) == NULL)
 281                         ret = -EINVAL;
 282                 else
 283                         br_stp_set_port_priority(p, args[2]);
 284                 spin_unlock_bh(&br->lock);
 285                 return ret;
 286         }
 287
 288         case BRCTL_SET_PATH_COST:
 289         {
 290                 struct net_bridge_port *p;
 291                 int ret = 0;
 292
 293                 if (!capable(CAP_NET_ADMIN))
 294                         return -EPERM;
 295
 296                 spin_lock_bh(&br->lock);
 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                 spin_unlock_bh(&br->lock);
 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 = kmalloc(args[2]*sizeof(int), GFP_KERNEL);
 332                 if (indices == NULL)
 333                         return -ENOMEM;
 334
 335                 memset(indices, 0, args[2]*sizeof(int));
 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(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 }