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 } 413