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