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 <linux/uaccess.h> 22 #include "br_private.h" 23 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 rcu_read_lock(); 30 for_each_netdev_rcu(net, dev) { 31 if (i >= num) 32 break; 33 if (dev->priv_flags & IFF_EBRIDGE) 34 indices[i++] = dev->ifindex; 35 } 36 rcu_read_unlock(); 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 /* called with RTNL */ 87 static int add_del_if(struct net_bridge *br, int ifindex, int isadd) 88 { 89 struct net *net = dev_net(br->dev); 90 struct net_device *dev; 91 int ret; 92 93 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 94 return -EPERM; 95 96 dev = __dev_get_by_index(net, ifindex); 97 if (dev == NULL) 98 return -EINVAL; 99 100 if (isadd) 101 ret = br_add_if(br, dev); 102 else 103 ret = br_del_if(br, dev); 104 105 if (!ret) 106 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_MASTER, GFP_KERNEL); 107 108 return ret; 109 } 110 111 /* 112 * Legacy ioctl's through SIOCDEVPRIVATE 113 * This interface is deprecated because it was too difficult to 114 * to do the translation for 32/64bit ioctl compatibility. 115 */ 116 static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 117 { 118 struct net_bridge *br = netdev_priv(dev); 119 struct net_bridge_port *p = NULL; 120 unsigned long args[4]; 121 int ret = -EOPNOTSUPP; 122 123 if (copy_from_user(args, rq->ifr_data, sizeof(args))) 124 return -EFAULT; 125 126 switch (args[0]) { 127 case BRCTL_ADD_IF: 128 case BRCTL_DEL_IF: 129 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF); 130 131 case BRCTL_GET_BRIDGE_INFO: 132 { 133 struct __bridge_info b; 134 135 memset(&b, 0, sizeof(struct __bridge_info)); 136 rcu_read_lock(); 137 memcpy(&b.designated_root, &br->designated_root, 8); 138 memcpy(&b.bridge_id, &br->bridge_id, 8); 139 b.root_path_cost = br->root_path_cost; 140 b.max_age = jiffies_to_clock_t(br->max_age); 141 b.hello_time = jiffies_to_clock_t(br->hello_time); 142 b.forward_delay = br->forward_delay; 143 b.bridge_max_age = br->bridge_max_age; 144 b.bridge_hello_time = br->bridge_hello_time; 145 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay); 146 b.topology_change = br->topology_change; 147 b.topology_change_detected = br->topology_change_detected; 148 b.root_port = br->root_port; 149 150 b.stp_enabled = (br->stp_enabled != BR_NO_STP); 151 b.ageing_time = jiffies_to_clock_t(br->ageing_time); 152 b.hello_timer_value = br_timer_value(&br->hello_timer); 153 b.tcn_timer_value = br_timer_value(&br->tcn_timer); 154 b.topology_change_timer_value = br_timer_value(&br->topology_change_timer); 155 b.gc_timer_value = br_timer_value(&br->gc_work.timer); 156 rcu_read_unlock(); 157 158 if (copy_to_user((void __user *)args[1], &b, sizeof(b))) 159 return -EFAULT; 160 161 return 0; 162 } 163 164 case BRCTL_GET_PORT_LIST: 165 { 166 int num, *indices; 167 168 num = args[2]; 169 if (num < 0) 170 return -EINVAL; 171 if (num == 0) 172 num = 256; 173 if (num > BR_MAX_PORTS) 174 num = BR_MAX_PORTS; 175 176 indices = kcalloc(num, sizeof(int), GFP_KERNEL); 177 if (indices == NULL) 178 return -ENOMEM; 179 180 get_port_ifindices(br, indices, num); 181 if (copy_to_user((void __user *)args[1], indices, num*sizeof(int))) 182 num = -EFAULT; 183 kfree(indices); 184 return num; 185 } 186 187 case BRCTL_SET_BRIDGE_FORWARD_DELAY: 188 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) 189 return -EPERM; 190 191 ret = br_set_forward_delay(br, args[1]); 192 break; 193 194 case BRCTL_SET_BRIDGE_HELLO_TIME: 195 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) 196 return -EPERM; 197 198 ret = br_set_hello_time(br, args[1]); 199 break; 200 201 case BRCTL_SET_BRIDGE_MAX_AGE: 202 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) 203 return -EPERM; 204 205 ret = br_set_max_age(br, args[1]); 206 break; 207 208 case BRCTL_SET_AGEING_TIME: 209 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) 210 return -EPERM; 211 212 ret = br_set_ageing_time(br, args[1]); 213 break; 214 215 case BRCTL_GET_PORT_INFO: 216 { 217 struct __port_info p; 218 struct net_bridge_port *pt; 219 220 rcu_read_lock(); 221 if ((pt = br_get_port(br, args[2])) == NULL) { 222 rcu_read_unlock(); 223 return -EINVAL; 224 } 225 226 memset(&p, 0, sizeof(struct __port_info)); 227 memcpy(&p.designated_root, &pt->designated_root, 8); 228 memcpy(&p.designated_bridge, &pt->designated_bridge, 8); 229 p.port_id = pt->port_id; 230 p.designated_port = pt->designated_port; 231 p.path_cost = pt->path_cost; 232 p.designated_cost = pt->designated_cost; 233 p.state = pt->state; 234 p.top_change_ack = pt->topology_change_ack; 235 p.config_pending = pt->config_pending; 236 p.message_age_timer_value = br_timer_value(&pt->message_age_timer); 237 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer); 238 p.hold_timer_value = br_timer_value(&pt->hold_timer); 239 240 rcu_read_unlock(); 241 242 if (copy_to_user((void __user *)args[1], &p, sizeof(p))) 243 return -EFAULT; 244 245 return 0; 246 } 247 248 case BRCTL_SET_BRIDGE_STP_STATE: 249 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) 250 return -EPERM; 251 252 br_stp_set_enabled(br, args[1]); 253 ret = 0; 254 break; 255 256 case BRCTL_SET_BRIDGE_PRIORITY: 257 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) 258 return -EPERM; 259 260 br_stp_set_bridge_priority(br, args[1]); 261 ret = 0; 262 break; 263 264 case BRCTL_SET_PORT_PRIORITY: 265 { 266 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) 267 return -EPERM; 268 269 spin_lock_bh(&br->lock); 270 if ((p = br_get_port(br, args[1])) == NULL) 271 ret = -EINVAL; 272 else 273 ret = br_stp_set_port_priority(p, args[2]); 274 spin_unlock_bh(&br->lock); 275 break; 276 } 277 278 case BRCTL_SET_PATH_COST: 279 { 280 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN)) 281 return -EPERM; 282 283 spin_lock_bh(&br->lock); 284 if ((p = br_get_port(br, args[1])) == NULL) 285 ret = -EINVAL; 286 else 287 ret = br_stp_set_path_cost(p, args[2]); 288 spin_unlock_bh(&br->lock); 289 break; 290 } 291 292 case BRCTL_GET_FDB_ENTRIES: 293 return get_fdb_entries(br, (void __user *)args[1], 294 args[2], args[3]); 295 } 296 297 if (!ret) { 298 if (p) 299 br_ifinfo_notify(RTM_NEWLINK, p); 300 else 301 netdev_state_change(br->dev); 302 } 303 304 return ret; 305 } 306 307 static int old_deviceless(struct net *net, void __user *uarg) 308 { 309 unsigned long args[3]; 310 311 if (copy_from_user(args, uarg, sizeof(args))) 312 return -EFAULT; 313 314 switch (args[0]) { 315 case BRCTL_GET_VERSION: 316 return BRCTL_VERSION; 317 318 case BRCTL_GET_BRIDGES: 319 { 320 int *indices; 321 int ret = 0; 322 323 if (args[2] >= 2048) 324 return -ENOMEM; 325 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL); 326 if (indices == NULL) 327 return -ENOMEM; 328 329 args[2] = get_bridge_ifindices(net, indices, args[2]); 330 331 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int)) 332 ? -EFAULT : args[2]; 333 334 kfree(indices); 335 return ret; 336 } 337 338 case BRCTL_ADD_BRIDGE: 339 case BRCTL_DEL_BRIDGE: 340 { 341 char buf[IFNAMSIZ]; 342 343 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 344 return -EPERM; 345 346 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ)) 347 return -EFAULT; 348 349 buf[IFNAMSIZ-1] = 0; 350 351 if (args[0] == BRCTL_ADD_BRIDGE) 352 return br_add_bridge(net, buf); 353 354 return br_del_bridge(net, buf); 355 } 356 } 357 358 return -EOPNOTSUPP; 359 } 360 361 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg) 362 { 363 switch (cmd) { 364 case SIOCGIFBR: 365 case SIOCSIFBR: 366 return old_deviceless(net, uarg); 367 368 case SIOCBRADDBR: 369 case SIOCBRDELBR: 370 { 371 char buf[IFNAMSIZ]; 372 373 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 374 return -EPERM; 375 376 if (copy_from_user(buf, uarg, IFNAMSIZ)) 377 return -EFAULT; 378 379 buf[IFNAMSIZ-1] = 0; 380 if (cmd == SIOCBRADDBR) 381 return br_add_bridge(net, buf); 382 383 return br_del_bridge(net, buf); 384 } 385 } 386 return -EOPNOTSUPP; 387 } 388 389 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 390 { 391 struct net_bridge *br = netdev_priv(dev); 392 393 switch (cmd) { 394 case SIOCDEVPRIVATE: 395 return old_dev_ioctl(dev, rq, cmd); 396 397 case SIOCBRADDIF: 398 case SIOCBRDELIF: 399 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF); 400 401 } 402 403 br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd); 404 return -EOPNOTSUPP; 405 } 406