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 /* Report time remaining in user HZ  */
  24 static unsigned long timer_residue(const struct timer_list *timer)
  25 {
  26         return timer_pending(timer)
  27                 ? jiffies_to_clock_t(timer->expires - jiffies) : 0;
  28 }
  29
  30 int br_ioctl_device(struct net_bridge *br, unsigned int cmd,
  31                    unsigned long arg0, unsigned long arg1, unsigned long arg2)
  32 {
  33         if (br == NULL)
  34                 return -EINVAL;
  35
  36         switch (cmd)
  37         {
  38         case BRCTL_ADD_IF:
  39         case BRCTL_DEL_IF:
  40         {
  41                 struct net_device *dev;
  42                 int ret;
  43
  44                 if (!capable(CAP_NET_ADMIN))
  45                         return -EPERM;
  46
  47                 dev = dev_get_by_index(arg0);
  48                 if (dev == NULL)
  49                         return -EINVAL;
  50
  51                 if (cmd == BRCTL_ADD_IF)
  52                         ret = br_add_if(br, dev);
  53                 else
  54                         ret = br_del_if(br, dev);
  55
  56                 dev_put(dev);
  57                 return ret;
  58         }
  59
  60         case BRCTL_GET_BRIDGE_INFO:
  61         {
  62                 struct __bridge_info b;
  63
  64                 memset(&b, 0, sizeof(struct __bridge_info));
  65                 rcu_read_lock();
  66                 memcpy(&b.designated_root, &br->designated_root, 8);
  67                 memcpy(&b.bridge_id, &br->bridge_id, 8);
  68                 b.root_path_cost = br->root_path_cost;
  69                 b.max_age = jiffies_to_clock_t(br->max_age);
  70                 b.hello_time = jiffies_to_clock_t(br->hello_time);
  71                 b.forward_delay = br->forward_delay;
  72                 b.bridge_max_age = br->bridge_max_age;
  73                 b.bridge_hello_time = br->bridge_hello_time;
  74                 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
  75                 b.topology_change = br->topology_change;
  76                 b.topology_change_detected = br->topology_change_detected;
  77                 b.root_port = br->root_port;
  78                 b.stp_enabled = br->stp_enabled;
  79                 b.ageing_time = jiffies_to_clock_t(br->ageing_time);
  80                 b.hello_timer_value = timer_residue(&br->hello_timer);
  81                 b.tcn_timer_value = timer_residue(&br->tcn_timer);
  82                 b.topology_change_timer_value = timer_residue(&br->topology_change_timer);
  83                 b.gc_timer_value = timer_residue(&br->gc_timer);
  84                 rcu_read_unlock();
  85
  86                 if (copy_to_user((void *)arg0, &b, sizeof(b)))
  87                         return -EFAULT;
  88
  89                 return 0;
  90         }
  91
  92         case BRCTL_GET_PORT_LIST:
  93         {
  94                 int num, *indices;
  95
  96                 num = arg1;
  97                 if (num < 0)
  98                         return -EINVAL;
  99                 if (num == 0)
 100                         num = 256;
 101                 if (num > BR_MAX_PORTS)
 102                         num = BR_MAX_PORTS;
 103
 104                 indices = kmalloc(num*sizeof(int), GFP_KERNEL);
 105                 if (indices == NULL)
 106                         return -ENOMEM;
 107
 108                 memset(indices, 0, num*sizeof(int));
 109
 110                 br_get_port_ifindices(br, indices, num);
 111                 if (copy_to_user((void *)arg0, indices, num*sizeof(int)))
 112                         num =  -EFAULT;
 113                 kfree(indices);
 114                 return num;
 115         }
 116
 117         case BRCTL_SET_BRIDGE_FORWARD_DELAY:
 118                 if (!capable(CAP_NET_ADMIN))
 119                         return -EPERM;
 120
 121                 spin_lock_bh(&br->lock);
 122                 br->bridge_forward_delay = clock_t_to_jiffies(arg0);
 123                 if (br_is_root_bridge(br))
 124                         br->forward_delay = br->bridge_forward_delay;
 125                 spin_unlock_bh(&br->lock);
 126                 return 0;
 127
 128         case BRCTL_SET_BRIDGE_HELLO_TIME:
 129                 if (!capable(CAP_NET_ADMIN))
 130                         return -EPERM;
 131
 132                 spin_lock_bh(&br->lock);
 133                 br->bridge_hello_time = clock_t_to_jiffies(arg0);
 134                 if (br_is_root_bridge(br))
 135                         br->hello_time = br->bridge_hello_time;
 136                 spin_unlock_bh(&br->lock);
 137                 return 0;
 138
 139         case BRCTL_SET_BRIDGE_MAX_AGE:
 140                 if (!capable(CAP_NET_ADMIN))
 141                         return -EPERM;
 142
 143                 spin_lock_bh(&br->lock);
 144                 br->bridge_max_age = clock_t_to_jiffies(arg0);
 145                 if (br_is_root_bridge(br))
 146                         br->max_age = br->bridge_max_age;
 147                 spin_unlock_bh(&br->lock);
 148                 return 0;
 149
 150         case BRCTL_SET_AGEING_TIME:
 151                 if (!capable(CAP_NET_ADMIN))
 152                         return -EPERM;
 153
 154                 br->ageing_time = clock_t_to_jiffies(arg0);
 155                 return 0;
 156
 157         case BRCTL_GET_PORT_INFO:
 158         {
 159                 struct __port_info p;
 160                 struct net_bridge_port *pt;
 161
 162                 rcu_read_lock();
 163                 if ((pt = br_get_port(br, arg1)) == NULL) {
 164                         rcu_read_unlock();
 165                         return -EINVAL;
 166                 }
 167
 168                 memset(&p, 0, sizeof(struct __port_info));
 169                 memcpy(&p.designated_root, &pt->designated_root, 8);
 170                 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
 171                 p.port_id = pt->port_id;
 172                 p.designated_port = pt->designated_port;
 173                 p.path_cost = pt->path_cost;
 174                 p.designated_cost = pt->designated_cost;
 175                 p.state = pt->state;
 176                 p.top_change_ack = pt->topology_change_ack;
 177                 p.config_pending = pt->config_pending;
 178                 p.message_age_timer_value = timer_residue(&pt->message_age_timer);
 179                 p.forward_delay_timer_value = timer_residue(&pt->forward_delay_timer);
 180                 p.hold_timer_value = timer_residue(&pt->hold_timer);
 181
 182                 rcu_read_unlock();
 183
 184                 if (copy_to_user((void *)arg0, &p, sizeof(p)))
 185                         return -EFAULT;
 186
 187                 return 0;
 188         }
 189
 190         case BRCTL_SET_BRIDGE_STP_STATE:
 191                 if (!capable(CAP_NET_ADMIN))
 192                         return -EPERM;
 193
 194                 br->stp_enabled = arg0?1:0;
 195                 return 0;
 196
 197         case BRCTL_SET_BRIDGE_PRIORITY:
 198                 if (!capable(CAP_NET_ADMIN))
 199                         return -EPERM;
 200
 201                 spin_lock_bh(&br->lock);
 202                 br_stp_set_bridge_priority(br, arg0);
 203                 spin_unlock_bh(&br->lock);
 204                 return 0;
 205
 206         case BRCTL_SET_PORT_PRIORITY:
 207         {
 208                 struct net_bridge_port *p;
 209                 int ret = 0;
 210
 211                 if (!capable(CAP_NET_ADMIN))
 212                         return -EPERM;
 213
 214                 if (arg1 >= (1<<(16-BR_PORT_BITS)))
 215                         return -ERANGE;
 216
 217                 spin_lock_bh(&br->lock);
 218                 if ((p = br_get_port(br, arg0)) == NULL)
 219                         ret = -EINVAL;
 220                 else
 221                         br_stp_set_port_priority(p, arg1);
 222                 spin_unlock_bh(&br->lock);
 223                 return ret;
 224         }
 225
 226         case BRCTL_SET_PATH_COST:
 227         {
 228                 struct net_bridge_port *p;
 229                 int ret = 0;
 230
 231                 if (!capable(CAP_NET_ADMIN))
 232                         return -EPERM;
 233
 234                 spin_lock_bh(&br->lock);
 235                 if ((p = br_get_port(br, arg0)) == NULL)
 236                         ret = -EINVAL;
 237                 else
 238                         br_stp_set_path_cost(p, arg1);
 239                 spin_unlock_bh(&br->lock);
 240                 return ret;
 241         }
 242
 243         case BRCTL_GET_FDB_ENTRIES:
 244                 return br_fdb_get_entries(br, (void *)arg0, arg1, arg2);
 245         }
 246
 247         return -EOPNOTSUPP;
 248 }
 249
 250 static int br_ioctl_deviceless(unsigned int cmd,
 251                                unsigned long arg0,
 252                                unsigned long arg1)
 253 {
 254         switch (cmd)
 255         {
 256         case BRCTL_GET_VERSION:
 257                 return BRCTL_VERSION;
 258
 259         case BRCTL_GET_BRIDGES:
 260         {
 261                 int *indices;
 262                 int ret = 0;
 263
 264                 indices = kmalloc(arg1*sizeof(int), GFP_KERNEL);
 265                 if (indices == NULL)
 266                         return -ENOMEM;
 267
 268                 memset(indices, 0, arg1*sizeof(int));
 269                 arg1 = br_get_bridge_ifindices(indices, arg1);
 270
 271                 ret = copy_to_user((void *)arg0, indices, arg1*sizeof(int))
 272                         ? -EFAULT : arg1;
 273
 274                 kfree(indices);
 275                 return ret;
 276         }
 277
 278         case BRCTL_ADD_BRIDGE:
 279         case BRCTL_DEL_BRIDGE:
 280         {
 281                 char buf[IFNAMSIZ];
 282
 283                 if (!capable(CAP_NET_ADMIN))
 284                         return -EPERM;
 285
 286                 if (copy_from_user(buf, (void *)arg0, IFNAMSIZ))
 287                         return -EFAULT;
 288
 289                 buf[IFNAMSIZ-1] = 0;
 290
 291                 if (cmd == BRCTL_ADD_BRIDGE)
 292                         return br_add_bridge(buf);
 293
 294                 return br_del_bridge(buf);
 295         }
 296         }
 297
 298         return -EOPNOTSUPP;
 299 }
 300
 301
 302 int br_ioctl_deviceless_stub(unsigned long arg)
 303 {
 304         unsigned long i[3];
 305
 306         if (copy_from_user(i, (void *)arg, 3*sizeof(unsigned long)))
 307                 return -EFAULT;
 308
 309         return br_ioctl_deviceless(i[0], i[1], i[2]);
 310 }