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