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