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/slab.h> 19 #include <linux/times.h> 20 #include <net/net_namespace.h> 21 #include <asm/uaccess.h> 22 #include "br_private.h" 23 24 /* called with RTNL */ 25 static int get_bridge_ifindices(struct net *net, int *indices, int num) 26 { 27 struct net_device *dev; 28 int i = 0; 29 30 for_each_netdev(net, 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 /* called with RTNL */ 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(dev_net(br->dev), 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 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 compatibility. 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 return br_set_forward_delay(br, args[1]); 185 186 case BRCTL_SET_BRIDGE_HELLO_TIME: 187 if (!capable(CAP_NET_ADMIN)) 188 return -EPERM; 189 190 return br_set_hello_time(br, args[1]); 191 192 case BRCTL_SET_BRIDGE_MAX_AGE: 193 if (!capable(CAP_NET_ADMIN)) 194 return -EPERM; 195 196 return br_set_max_age(br, args[1]); 197 198 case BRCTL_SET_AGEING_TIME: 199 if (!capable(CAP_NET_ADMIN)) 200 return -EPERM; 201 202 br->ageing_time = clock_t_to_jiffies(args[1]); 203 return 0; 204 205 case BRCTL_GET_PORT_INFO: 206 { 207 struct __port_info p; 208 struct net_bridge_port *pt; 209 210 rcu_read_lock(); 211 if ((pt = br_get_port(br, args[2])) == NULL) { 212 rcu_read_unlock(); 213 return -EINVAL; 214 } 215 216 memset(&p, 0, sizeof(struct __port_info)); 217 memcpy(&p.designated_root, &pt->designated_root, 8); 218 memcpy(&p.designated_bridge, &pt->designated_bridge, 8); 219 p.port_id = pt->port_id; 220 p.designated_port = pt->designated_port; 221 p.path_cost = pt->path_cost; 222 p.designated_cost = pt->designated_cost; 223 p.state = pt->state; 224 p.top_change_ack = pt->topology_change_ack; 225 p.config_pending = pt->config_pending; 226 p.message_age_timer_value = br_timer_value(&pt->message_age_timer); 227 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer); 228 p.hold_timer_value = br_timer_value(&pt->hold_timer); 229 230 rcu_read_unlock(); 231 232 if (copy_to_user((void __user *)args[1], &p, sizeof(p))) 233 return -EFAULT; 234 235 return 0; 236 } 237 238 case BRCTL_SET_BRIDGE_STP_STATE: 239 if (!capable(CAP_NET_ADMIN)) 240 return -EPERM; 241 242 br_stp_set_enabled(br, args[1]); 243 return 0; 244 245 case BRCTL_SET_BRIDGE_PRIORITY: 246 if (!capable(CAP_NET_ADMIN)) 247 return -EPERM; 248 249 spin_lock_bh(&br->lock); 250 br_stp_set_bridge_priority(br, args[1]); 251 spin_unlock_bh(&br->lock); 252 return 0; 253 254 case BRCTL_SET_PORT_PRIORITY: 255 { 256 struct net_bridge_port *p; 257 int ret; 258 259 if (!capable(CAP_NET_ADMIN)) 260 return -EPERM; 261 262 spin_lock_bh(&br->lock); 263 if ((p = br_get_port(br, args[1])) == NULL) 264 ret = -EINVAL; 265 else 266 ret = br_stp_set_port_priority(p, args[2]); 267 spin_unlock_bh(&br->lock); 268 return ret; 269 } 270 271 case BRCTL_SET_PATH_COST: 272 { 273 struct net_bridge_port *p; 274 int ret; 275 276 if (!capable(CAP_NET_ADMIN)) 277 return -EPERM; 278 279 spin_lock_bh(&br->lock); 280 if ((p = br_get_port(br, args[1])) == NULL) 281 ret = -EINVAL; 282 else 283 ret = br_stp_set_path_cost(p, args[2]); 284 spin_unlock_bh(&br->lock); 285 286 return ret; 287 } 288 289 case BRCTL_GET_FDB_ENTRIES: 290 return get_fdb_entries(br, (void __user *)args[1], 291 args[2], args[3]); 292 } 293 294 return -EOPNOTSUPP; 295 } 296 297 static int old_deviceless(struct net *net, void __user *uarg) 298 { 299 unsigned long args[3]; 300 301 if (copy_from_user(args, uarg, sizeof(args))) 302 return -EFAULT; 303 304 switch (args[0]) { 305 case BRCTL_GET_VERSION: 306 return BRCTL_VERSION; 307 308 case BRCTL_GET_BRIDGES: 309 { 310 int *indices; 311 int ret = 0; 312 313 if (args[2] >= 2048) 314 return -ENOMEM; 315 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL); 316 if (indices == NULL) 317 return -ENOMEM; 318 319 args[2] = get_bridge_ifindices(net, indices, args[2]); 320 321 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int)) 322 ? -EFAULT : args[2]; 323 324 kfree(indices); 325 return ret; 326 } 327 328 case BRCTL_ADD_BRIDGE: 329 case BRCTL_DEL_BRIDGE: 330 { 331 char buf[IFNAMSIZ]; 332 333 if (!capable(CAP_NET_ADMIN)) 334 return -EPERM; 335 336 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ)) 337 return -EFAULT; 338 339 buf[IFNAMSIZ-1] = 0; 340 341 if (args[0] == BRCTL_ADD_BRIDGE) 342 return br_add_bridge(net, buf); 343 344 return br_del_bridge(net, buf); 345 } 346 } 347 348 return -EOPNOTSUPP; 349 } 350 351 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg) 352 { 353 switch (cmd) { 354 case SIOCGIFBR: 355 case SIOCSIFBR: 356 return old_deviceless(net, uarg); 357 358 case SIOCBRADDBR: 359 case SIOCBRDELBR: 360 { 361 char buf[IFNAMSIZ]; 362 363 if (!capable(CAP_NET_ADMIN)) 364 return -EPERM; 365 366 if (copy_from_user(buf, uarg, IFNAMSIZ)) 367 return -EFAULT; 368 369 buf[IFNAMSIZ-1] = 0; 370 if (cmd == SIOCBRADDBR) 371 return br_add_bridge(net, buf); 372 373 return br_del_bridge(net, buf); 374 } 375 } 376 return -EOPNOTSUPP; 377 } 378 379 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 380 { 381 struct net_bridge *br = netdev_priv(dev); 382 383 switch(cmd) { 384 case SIOCDEVPRIVATE: 385 return old_dev_ioctl(dev, rq, cmd); 386 387 case SIOCBRADDIF: 388 case SIOCBRDELIF: 389 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF); 390 391 } 392 393 br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd); 394 return -EOPNOTSUPP; 395 } 396