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 = maxnum * sizeof(struct __fdb_entry); 62 63 if (size > PAGE_SIZE) { 64 size = PAGE_SIZE; 65 maxnum = PAGE_SIZE/sizeof(struct __fdb_entry); 66 } 67 68 buf = kmalloc(size, GFP_USER); 69 if (!buf) 70 return -ENOMEM; 71 72 num = br_fdb_fillbuf(br, buf, maxnum, offset); 73 if (num > 0) { 74 if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry))) 75 num = -EFAULT; 76 } 77 kfree(buf); 78 79 return num; 80 } 81 82 static int add_del_if(struct net_bridge *br, int ifindex, int isadd) 83 { 84 struct net_device *dev; 85 int ret; 86 87 if (!capable(CAP_NET_ADMIN)) 88 return -EPERM; 89 90 dev = dev_get_by_index(ifindex); 91 if (dev == NULL) 92 return -EINVAL; 93 94 if (isadd) 95 ret = br_add_if(br, dev); 96 else 97 ret = br_del_if(br, dev); 98 99 dev_put(dev); 100 return ret; 101 } 102 103 /* 104 * Legacy ioctl's through SIOCDEVPRIVATE 105 * This interface is deprecated because it was too difficult to 106 * to do the translation for 32/64bit ioctl compatability. 107 */ 108 static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 109 { 110 struct net_bridge *br = netdev_priv(dev); 111 unsigned long args[4]; 112 113 if (copy_from_user(args, rq->ifr_data, sizeof(args))) 114 return -EFAULT; 115 116 switch (args[0]) { 117 case BRCTL_ADD_IF: 118 case BRCTL_DEL_IF: 119 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF); 120 121 case BRCTL_GET_BRIDGE_INFO: 122 { 123 struct __bridge_info b; 124 125 memset(&b, 0, sizeof(struct __bridge_info)); 126 rcu_read_lock(); 127 memcpy(&b.designated_root, &br->designated_root, 8); 128 memcpy(&b.bridge_id, &br->bridge_id, 8); 129 b.root_path_cost = br->root_path_cost; 130 b.max_age = jiffies_to_clock_t(br->max_age); 131 b.hello_time = jiffies_to_clock_t(br->hello_time); 132 b.forward_delay = br->forward_delay; 133 b.bridge_max_age = br->bridge_max_age; 134 b.bridge_hello_time = br->bridge_hello_time; 135 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay); 136 b.topology_change = br->topology_change; 137 b.topology_change_detected = br->topology_change_detected; 138 b.root_port = br->root_port; 139 b.stp_enabled = br->stp_enabled; 140 b.ageing_time = jiffies_to_clock_t(br->ageing_time); 141 b.hello_timer_value = br_timer_value(&br->hello_timer); 142 b.tcn_timer_value = br_timer_value(&br->tcn_timer); 143 b.topology_change_timer_value = br_timer_value(&br->topology_change_timer); 144 b.gc_timer_value = br_timer_value(&br->gc_timer); 145 rcu_read_unlock(); 146 147 if (copy_to_user((void __user *)args[1], &b, sizeof(b))) 148 return -EFAULT; 149 150 return 0; 151 } 152 153 case BRCTL_GET_PORT_LIST: 154 { 155 int num, *indices; 156 157 num = args[2]; 158 if (num < 0) 159 return -EINVAL; 160 if (num == 0) 161 num = 256; 162 if (num > BR_MAX_PORTS) 163 num = BR_MAX_PORTS; 164 165 indices = kcalloc(num, sizeof(int), GFP_KERNEL); 166 if (indices == NULL) 167 return -ENOMEM; 168 169 get_port_ifindices(br, indices, num); 170 if (copy_to_user((void __user *)args[1], indices, num*sizeof(int))) 171 num = -EFAULT; 172 kfree(indices); 173 return num; 174 } 175 176 case BRCTL_SET_BRIDGE_FORWARD_DELAY: 177 if (!capable(CAP_NET_ADMIN)) 178 return -EPERM; 179 180 spin_lock_bh(&br->lock); 181 br->bridge_forward_delay = clock_t_to_jiffies(args[1]); 182 if (br_is_root_bridge(br)) 183 br->forward_delay = br->bridge_forward_delay; 184 spin_unlock_bh(&br->lock); 185 return 0; 186 187 case BRCTL_SET_BRIDGE_HELLO_TIME: 188 if (!capable(CAP_NET_ADMIN)) 189 return -EPERM; 190 191 spin_lock_bh(&br->lock); 192 br->bridge_hello_time = clock_t_to_jiffies(args[1]); 193 if (br_is_root_bridge(br)) 194 br->hello_time = br->bridge_hello_time; 195 spin_unlock_bh(&br->lock); 196 return 0; 197 198 case BRCTL_SET_BRIDGE_MAX_AGE: 199 if (!capable(CAP_NET_ADMIN)) 200 return -EPERM; 201 202 spin_lock_bh(&br->lock); 203 br->bridge_max_age = clock_t_to_jiffies(args[1]); 204 if (br_is_root_bridge(br)) 205 br->max_age = br->bridge_max_age; 206 spin_unlock_bh(&br->lock); 207 return 0; 208 209 case BRCTL_SET_AGEING_TIME: 210 if (!capable(CAP_NET_ADMIN)) 211 return -EPERM; 212 213 br->ageing_time = clock_t_to_jiffies(args[1]); 214 return 0; 215 216 case BRCTL_GET_PORT_INFO: 217 { 218 struct __port_info p; 219 struct net_bridge_port *pt; 220 221 rcu_read_lock(); 222 if ((pt = br_get_port(br, args[2])) == NULL) { 223 rcu_read_unlock(); 224 return -EINVAL; 225 } 226 227 memset(&p, 0, sizeof(struct __port_info)); 228 memcpy(&p.designated_root, &pt->designated_root, 8); 229 memcpy(&p.designated_bridge, &pt->designated_bridge, 8); 230 p.port_id = pt->port_id; 231 p.designated_port = pt->designated_port; 232 p.path_cost = pt->path_cost; 233 p.designated_cost = pt->designated_cost; 234 p.state = pt->state; 235 p.top_change_ack = pt->topology_change_ack; 236 p.config_pending = pt->config_pending; 237 p.message_age_timer_value = br_timer_value(&pt->message_age_timer); 238 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer); 239 p.hold_timer_value = br_timer_value(&pt->hold_timer); 240 241 rcu_read_unlock(); 242 243 if (copy_to_user((void __user *)args[1], &p, sizeof(p))) 244 return -EFAULT; 245 246 return 0; 247 } 248 249 case BRCTL_SET_BRIDGE_STP_STATE: 250 if (!capable(CAP_NET_ADMIN)) 251 return -EPERM; 252 253 br->stp_enabled = args[1]?1:0; 254 return 0; 255 256 case BRCTL_SET_BRIDGE_PRIORITY: 257 if (!capable(CAP_NET_ADMIN)) 258 return -EPERM; 259 260 spin_lock_bh(&br->lock); 261 br_stp_set_bridge_priority(br, args[1]); 262 spin_unlock_bh(&br->lock); 263 return 0; 264 265 case BRCTL_SET_PORT_PRIORITY: 266 { 267 struct net_bridge_port *p; 268 int ret = 0; 269 270 if (!capable(CAP_NET_ADMIN)) 271 return -EPERM; 272 273 if (args[2] >= (1<<(16-BR_PORT_BITS))) 274 return -ERANGE; 275 276 spin_lock_bh(&br->lock); 277 if ((p = br_get_port(br, args[1])) == NULL) 278 ret = -EINVAL; 279 else 280 br_stp_set_port_priority(p, args[2]); 281 spin_unlock_bh(&br->lock); 282 return ret; 283 } 284 285 case BRCTL_SET_PATH_COST: 286 { 287 struct net_bridge_port *p; 288 int ret = 0; 289 290 if (!capable(CAP_NET_ADMIN)) 291 return -EPERM; 292 293 spin_lock_bh(&br->lock); 294 if ((p = br_get_port(br, args[1])) == NULL) 295 ret = -EINVAL; 296 else 297 br_stp_set_path_cost(p, args[2]); 298 spin_unlock_bh(&br->lock); 299 return ret; 300 } 301 302 case BRCTL_GET_FDB_ENTRIES: 303 return get_fdb_entries(br, (void __user *)args[1], 304 args[2], args[3]); 305 } 306 307 return -EOPNOTSUPP; 308 } 309 310 static int old_deviceless(void __user *uarg) 311 { 312 unsigned long args[3]; 313 314 if (copy_from_user(args, uarg, sizeof(args))) 315 return -EFAULT; 316 317 switch (args[0]) { 318 case BRCTL_GET_VERSION: 319 return BRCTL_VERSION; 320 321 case BRCTL_GET_BRIDGES: 322 { 323 int *indices; 324 int ret = 0; 325 326 if (args[2] >= 2048) 327 return -ENOMEM; 328 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL); 329 if (indices == NULL) 330 return -ENOMEM; 331 332 args[2] = get_bridge_ifindices(indices, args[2]); 333 334 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int)) 335 ? -EFAULT : args[2]; 336 337 kfree(indices); 338 return ret; 339 } 340 341 case BRCTL_ADD_BRIDGE: 342 case BRCTL_DEL_BRIDGE: 343 { 344 char buf[IFNAMSIZ]; 345 346 if (!capable(CAP_NET_ADMIN)) 347 return -EPERM; 348 349 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ)) 350 return -EFAULT; 351 352 buf[IFNAMSIZ-1] = 0; 353 354 if (args[0] == BRCTL_ADD_BRIDGE) 355 return br_add_bridge(buf); 356 357 return br_del_bridge(buf); 358 } 359 } 360 361 return -EOPNOTSUPP; 362 } 363 364 int br_ioctl_deviceless_stub(unsigned int cmd, void __user *uarg) 365 { 366 switch (cmd) { 367 case SIOCGIFBR: 368 case SIOCSIFBR: 369 return old_deviceless(uarg); 370 371 case SIOCBRADDBR: 372 case SIOCBRDELBR: 373 { 374 char buf[IFNAMSIZ]; 375 376 if (!capable(CAP_NET_ADMIN)) 377 return -EPERM; 378 379 if (copy_from_user(buf, uarg, IFNAMSIZ)) 380 return -EFAULT; 381 382 buf[IFNAMSIZ-1] = 0; 383 if (cmd == SIOCBRADDBR) 384 return br_add_bridge(buf); 385 386 return br_del_bridge(buf); 387 } 388 } 389 return -EOPNOTSUPP; 390 } 391 392 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 393 { 394 struct net_bridge *br = netdev_priv(dev); 395 396 switch(cmd) { 397 case SIOCDEVPRIVATE: 398 return old_dev_ioctl(dev, rq, cmd); 399 400 case SIOCBRADDIF: 401 case SIOCBRDELIF: 402 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF); 403 404 } 405 406 pr_debug("Bridge does not support ioctl 0x%x\n", cmd); 407 return -EOPNOTSUPP; 408 } 409