1 /* 2 * Ioctl handler 3 * Linux ethernet bridge 4 * 5 * Authors: 6 * Lennert Buytenhek <buytenh@gnu.org> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 11 * 2 of the License, or (at your option) any later version. 12 */ 13 14 #include <linux/capability.h> 15 #include <linux/kernel.h> 16 #include <linux/if_bridge.h> 17 #include <linux/netdevice.h> 18 #include <linux/times.h> 19 #include <net/net_namespace.h> 20 #include <asm/uaccess.h> 21 #include "br_private.h" 22 23 /* called with RTNL */ 24 static int get_bridge_ifindices(struct net *net, int *indices, int num) 25 { 26 struct net_device *dev; 27 int i = 0; 28 29 for_each_netdev(net, dev) { 30 if (i >= num) 31 break; 32 if (dev->priv_flags & IFF_EBRIDGE) 33 indices[i++] = dev->ifindex; 34 } 35 36 return i; 37 } 38 39 /* called with RTNL */ 40 static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num) 41 { 42 struct net_bridge_port *p; 43 44 list_for_each_entry(p, &br->port_list, list) { 45 if (p->port_no < num) 46 ifindices[p->port_no] = p->dev->ifindex; 47 } 48 } 49 50 /* 51 * Format up to a page worth of forwarding table entries 52 * userbuf -- where to copy result 53 * maxnum -- maximum number of entries desired 54 * (limited to a page for sanity) 55 * offset -- number of records to skip 56 */ 57 static int get_fdb_entries(struct net_bridge *br, void __user *userbuf, 58 unsigned long maxnum, unsigned long offset) 59 { 60 int num; 61 void *buf; 62 size_t size; 63 64 /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */ 65 if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry)) 66 maxnum = PAGE_SIZE/sizeof(struct __fdb_entry); 67 68 size = maxnum * sizeof(struct __fdb_entry); 69 70 buf = kmalloc(size, GFP_USER); 71 if (!buf) 72 return -ENOMEM; 73 74 num = br_fdb_fillbuf(br, buf, maxnum, offset); 75 if (num > 0) { 76 if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry))) 77 num = -EFAULT; 78 } 79 kfree(buf); 80 81 return num; 82 } 83 84 static int add_del_if(struct net_bridge *br, int ifindex, int isadd) 85 { 86 struct net_device *dev; 87 int ret; 88 89 if (!capable(CAP_NET_ADMIN)) 90 return -EPERM; 91 92 dev = dev_get_by_index(dev_net(br->dev), ifindex); 93 if (dev == NULL) 94 return -EINVAL; 95 96 if (isadd) 97 ret = br_add_if(br, dev); 98 else 99 ret = br_del_if(br, dev); 100 101 dev_put(dev); 102 return ret; 103 } 104 105 /* 106 * Legacy ioctl's through SIOCDEVPRIVATE 107 * This interface is deprecated because it was too difficult to 108 * to do the translation for 32/64bit ioctl compatability. 109 */ 110 static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 111 { 112 struct net_bridge *br = netdev_priv(dev); 113 unsigned long args[4]; 114 115 if (copy_from_user(args, rq->ifr_data, sizeof(args))) 116 return -EFAULT; 117 118 switch (args[0]) { 119 case BRCTL_ADD_IF: 120 case BRCTL_DEL_IF: 121 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF); 122 123 case BRCTL_GET_BRIDGE_INFO: 124 { 125 struct __bridge_info b; 126 127 memset(&b, 0, sizeof(struct __bridge_info)); 128 rcu_read_lock(); 129 memcpy(&b.designated_root, &br->designated_root, 8); 130 memcpy(&b.bridge_id, &br->bridge_id, 8); 131 b.root_path_cost = br->root_path_cost; 132 b.max_age = jiffies_to_clock_t(br->max_age); 133 b.hello_time = jiffies_to_clock_t(br->hello_time); 134 b.forward_delay = br->forward_delay; 135 b.bridge_max_age = br->bridge_max_age; 136 b.bridge_hello_time = br->bridge_hello_time; 137 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay); 138 b.topology_change = br->topology_change; 139 b.topology_change_detected = br->topology_change_detected; 140 b.root_port = br->root_port; 141 142 b.stp_enabled = (br->stp_enabled != BR_NO_STP); 143 b.ageing_time = jiffies_to_clock_t(br->ageing_time); 144 b.hello_timer_value = br_timer_value(&br->hello_timer); 145 b.tcn_timer_value = br_timer_value(&br->tcn_timer); 146 b.topology_change_timer_value = br_timer_value(&br->topology_change_timer); 147 b.gc_timer_value = br_timer_value(&br->gc_timer); 148 rcu_read_unlock(); 149 150 if (copy_to_user((void __user *)args[1], &b, sizeof(b))) 151 return -EFAULT; 152 153 return 0; 154 } 155 156 case BRCTL_GET_PORT_LIST: 157 { 158 int num, *indices; 159 160 num = args[2]; 161 if (num < 0) 162 return -EINVAL; 163 if (num == 0) 164 num = 256; 165 if (num > BR_MAX_PORTS) 166 num = BR_MAX_PORTS; 167 168 indices = kcalloc(num, sizeof(int), GFP_KERNEL); 169 if (indices == NULL) 170 return -ENOMEM; 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 { 192 unsigned long t = clock_t_to_jiffies(args[1]); 193 if (!capable(CAP_NET_ADMIN)) 194 return -EPERM; 195 196 if (t < HZ) 197 return -EINVAL; 198 199 spin_lock_bh(&br->lock); 200 br->bridge_hello_time = t; 201 if (br_is_root_bridge(br)) 202 br->hello_time = br->bridge_hello_time; 203 spin_unlock_bh(&br->lock); 204 return 0; 205 } 206 207 case BRCTL_SET_BRIDGE_MAX_AGE: 208 if (!capable(CAP_NET_ADMIN)) 209 return -EPERM; 210 211 spin_lock_bh(&br->lock); 212 br->bridge_max_age = clock_t_to_jiffies(args[1]); 213 if (br_is_root_bridge(br)) 214 br->max_age = br->bridge_max_age; 215 spin_unlock_bh(&br->lock); 216 return 0; 217 218 case BRCTL_SET_AGEING_TIME: 219 if (!capable(CAP_NET_ADMIN)) 220 return -EPERM; 221 222 br->ageing_time = clock_t_to_jiffies(args[1]); 223 return 0; 224 225 case BRCTL_GET_PORT_INFO: 226 { 227 struct __port_info p; 228 struct net_bridge_port *pt; 229 230 rcu_read_lock(); 231 if ((pt = br_get_port(br, args[2])) == NULL) { 232 rcu_read_unlock(); 233 return -EINVAL; 234 } 235 236 memset(&p, 0, sizeof(struct __port_info)); 237 memcpy(&p.designated_root, &pt->designated_root, 8); 238 memcpy(&p.designated_bridge, &pt->designated_bridge, 8); 239 p.port_id = pt->port_id; 240 p.designated_port = pt->designated_port; 241 p.path_cost = pt->path_cost; 242 p.designated_cost = pt->designated_cost; 243 p.state = pt->state; 244 p.top_change_ack = pt->topology_change_ack; 245 p.config_pending = pt->config_pending; 246 p.message_age_timer_value = br_timer_value(&pt->message_age_timer); 247 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer); 248 p.hold_timer_value = br_timer_value(&pt->hold_timer); 249 250 rcu_read_unlock(); 251 252 if (copy_to_user((void __user *)args[1], &p, sizeof(p))) 253 return -EFAULT; 254 255 return 0; 256 } 257 258 case BRCTL_SET_BRIDGE_STP_STATE: 259 if (!capable(CAP_NET_ADMIN)) 260 return -EPERM; 261 262 br_stp_set_enabled(br, args[1]); 263 return 0; 264 265 case BRCTL_SET_BRIDGE_PRIORITY: 266 if (!capable(CAP_NET_ADMIN)) 267 return -EPERM; 268 269 spin_lock_bh(&br->lock); 270 br_stp_set_bridge_priority(br, args[1]); 271 spin_unlock_bh(&br->lock); 272 return 0; 273 274 case BRCTL_SET_PORT_PRIORITY: 275 { 276 struct net_bridge_port *p; 277 int ret = 0; 278 279 if (!capable(CAP_NET_ADMIN)) 280 return -EPERM; 281 282 if (args[2] >= (1<<(16-BR_PORT_BITS))) 283 return -ERANGE; 284 285 spin_lock_bh(&br->lock); 286 if ((p = br_get_port(br, args[1])) == NULL) 287 ret = -EINVAL; 288 else 289 br_stp_set_port_priority(p, args[2]); 290 spin_unlock_bh(&br->lock); 291 return ret; 292 } 293 294 case BRCTL_SET_PATH_COST: 295 { 296 struct net_bridge_port *p; 297 int ret = 0; 298 299 if (!capable(CAP_NET_ADMIN)) 300 return -EPERM; 301 302 if ((p = br_get_port(br, args[1])) == NULL) 303 ret = -EINVAL; 304 else 305 br_stp_set_path_cost(p, args[2]); 306 307 return ret; 308 } 309 310 case BRCTL_GET_FDB_ENTRIES: 311 return get_fdb_entries(br, (void __user *)args[1], 312 args[2], args[3]); 313 } 314 315 return -EOPNOTSUPP; 316 } 317 318 static int old_deviceless(struct net *net, void __user *uarg) 319 { 320 unsigned long args[3]; 321 322 if (copy_from_user(args, uarg, sizeof(args))) 323 return -EFAULT; 324 325 switch (args[0]) { 326 case BRCTL_GET_VERSION: 327 return BRCTL_VERSION; 328 329 case BRCTL_GET_BRIDGES: 330 { 331 int *indices; 332 int ret = 0; 333 334 if (args[2] >= 2048) 335 return -ENOMEM; 336 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL); 337 if (indices == NULL) 338 return -ENOMEM; 339 340 args[2] = get_bridge_ifindices(net, indices, args[2]); 341 342 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int)) 343 ? -EFAULT : args[2]; 344 345 kfree(indices); 346 return ret; 347 } 348 349 case BRCTL_ADD_BRIDGE: 350 case BRCTL_DEL_BRIDGE: 351 { 352 char buf[IFNAMSIZ]; 353 354 if (!capable(CAP_NET_ADMIN)) 355 return -EPERM; 356 357 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ)) 358 return -EFAULT; 359 360 buf[IFNAMSIZ-1] = 0; 361 362 if (args[0] == BRCTL_ADD_BRIDGE) 363 return br_add_bridge(net, buf); 364 365 return br_del_bridge(net, buf); 366 } 367 } 368 369 return -EOPNOTSUPP; 370 } 371 372 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg) 373 { 374 switch (cmd) { 375 case SIOCGIFBR: 376 case SIOCSIFBR: 377 return old_deviceless(net, uarg); 378 379 case SIOCBRADDBR: 380 case SIOCBRDELBR: 381 { 382 char buf[IFNAMSIZ]; 383 384 if (!capable(CAP_NET_ADMIN)) 385 return -EPERM; 386 387 if (copy_from_user(buf, uarg, IFNAMSIZ)) 388 return -EFAULT; 389 390 buf[IFNAMSIZ-1] = 0; 391 if (cmd == SIOCBRADDBR) 392 return br_add_bridge(net, buf); 393 394 return br_del_bridge(net, buf); 395 } 396 } 397 return -EOPNOTSUPP; 398 } 399 400 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 401 { 402 struct net_bridge *br = netdev_priv(dev); 403 404 switch(cmd) { 405 case SIOCDEVPRIVATE: 406 return old_dev_ioctl(dev, rq, cmd); 407 408 case SIOCBRADDIF: 409 case SIOCBRDELIF: 410 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF); 411 412 } 413 414 pr_debug("Bridge does not support ioctl 0x%x\n", cmd); 415 return -EOPNOTSUPP; 416 } 417