3 * Linux ethernet bridge
6 * Lennert Buytenhek <buytenh@gnu.org>
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.
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"
24 /* called with RTNL */
25 static int get_bridge_ifindices(struct net *net, int *indices, int num)
27 struct net_device *dev;
30 for_each_netdev(net, dev) {
33 if (dev->priv_flags & IFF_EBRIDGE)
34 indices[i++] = dev->ifindex;
40 /* called with RTNL */
41 static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
43 struct net_bridge_port *p;
45 list_for_each_entry(p, &br->port_list, list) {
47 ifindices[p->port_no] = p->dev->ifindex;
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
58 static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
59 unsigned long maxnum, unsigned long offset)
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);
69 size = maxnum * sizeof(struct __fdb_entry);
71 buf = kmalloc(size, GFP_USER);
75 num = br_fdb_fillbuf(br, buf, maxnum, offset);
77 if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
85 /* called with RTNL */
86 static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
88 struct net_device *dev;
91 if (!capable(CAP_NET_ADMIN))
94 dev = __dev_get_by_index(dev_net(br->dev), ifindex);
99 ret = br_add_if(br, dev);
101 ret = br_del_if(br, dev);
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 compatability.
111 static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
113 struct net_bridge *br = netdev_priv(dev);
114 unsigned long args[4];
116 if (copy_from_user(args, rq->ifr_data, sizeof(args)))
122 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
124 case BRCTL_GET_BRIDGE_INFO:
126 struct __bridge_info b;
128 memset(&b, 0, sizeof(struct __bridge_info));
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;
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);
151 if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
157 case BRCTL_GET_PORT_LIST:
166 if (num > BR_MAX_PORTS)
169 indices = kcalloc(num, sizeof(int), GFP_KERNEL);
173 get_port_ifindices(br, indices, num);
174 if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
180 case BRCTL_SET_BRIDGE_FORWARD_DELAY:
181 if (!capable(CAP_NET_ADMIN))
184 spin_lock_bh(&br->lock);
185 br->bridge_forward_delay = clock_t_to_jiffies(args[1]);
186 if (br_is_root_bridge(br))
187 br->forward_delay = br->bridge_forward_delay;
188 spin_unlock_bh(&br->lock);
191 case BRCTL_SET_BRIDGE_HELLO_TIME:
193 unsigned long t = clock_t_to_jiffies(args[1]);
194 if (!capable(CAP_NET_ADMIN))
200 spin_lock_bh(&br->lock);
201 br->bridge_hello_time = t;
202 if (br_is_root_bridge(br))
203 br->hello_time = br->bridge_hello_time;
204 spin_unlock_bh(&br->lock);
208 case BRCTL_SET_BRIDGE_MAX_AGE:
209 if (!capable(CAP_NET_ADMIN))
212 spin_lock_bh(&br->lock);
213 br->bridge_max_age = clock_t_to_jiffies(args[1]);
214 if (br_is_root_bridge(br))
215 br->max_age = br->bridge_max_age;
216 spin_unlock_bh(&br->lock);
219 case BRCTL_SET_AGEING_TIME:
220 if (!capable(CAP_NET_ADMIN))
223 br->ageing_time = clock_t_to_jiffies(args[1]);
226 case BRCTL_GET_PORT_INFO:
228 struct __port_info p;
229 struct net_bridge_port *pt;
232 if ((pt = br_get_port(br, args[2])) == NULL) {
237 memset(&p, 0, sizeof(struct __port_info));
238 memcpy(&p.designated_root, &pt->designated_root, 8);
239 memcpy(&p.designated_bridge, &pt->designated_bridge, 8);
240 p.port_id = pt->port_id;
241 p.designated_port = pt->designated_port;
242 p.path_cost = pt->path_cost;
243 p.designated_cost = pt->designated_cost;
245 p.top_change_ack = pt->topology_change_ack;
246 p.config_pending = pt->config_pending;
247 p.message_age_timer_value = br_timer_value(&pt->message_age_timer);
248 p.forward_delay_timer_value = br_timer_value(&pt->forward_delay_timer);
249 p.hold_timer_value = br_timer_value(&pt->hold_timer);
253 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
259 case BRCTL_SET_BRIDGE_STP_STATE:
260 if (!capable(CAP_NET_ADMIN))
263 br_stp_set_enabled(br, args[1]);
266 case BRCTL_SET_BRIDGE_PRIORITY:
267 if (!capable(CAP_NET_ADMIN))
270 spin_lock_bh(&br->lock);
271 br_stp_set_bridge_priority(br, args[1]);
272 spin_unlock_bh(&br->lock);
275 case BRCTL_SET_PORT_PRIORITY:
277 struct net_bridge_port *p;
280 if (!capable(CAP_NET_ADMIN))
283 if (args[2] >= (1<<(16-BR_PORT_BITS)))
286 spin_lock_bh(&br->lock);
287 if ((p = br_get_port(br, args[1])) == NULL)
290 br_stp_set_port_priority(p, args[2]);
291 spin_unlock_bh(&br->lock);
295 case BRCTL_SET_PATH_COST:
297 struct net_bridge_port *p;
300 if (!capable(CAP_NET_ADMIN))
303 if ((p = br_get_port(br, args[1])) == NULL)
306 br_stp_set_path_cost(p, args[2]);
311 case BRCTL_GET_FDB_ENTRIES:
312 return get_fdb_entries(br, (void __user *)args[1],
319 static int old_deviceless(struct net *net, void __user *uarg)
321 unsigned long args[3];
323 if (copy_from_user(args, uarg, sizeof(args)))
327 case BRCTL_GET_VERSION:
328 return BRCTL_VERSION;
330 case BRCTL_GET_BRIDGES:
337 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
341 args[2] = get_bridge_ifindices(net, indices, args[2]);
343 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
350 case BRCTL_ADD_BRIDGE:
351 case BRCTL_DEL_BRIDGE:
355 if (!capable(CAP_NET_ADMIN))
358 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
363 if (args[0] == BRCTL_ADD_BRIDGE)
364 return br_add_bridge(net, buf);
366 return br_del_bridge(net, buf);
373 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
378 return old_deviceless(net, uarg);
385 if (!capable(CAP_NET_ADMIN))
388 if (copy_from_user(buf, uarg, IFNAMSIZ))
392 if (cmd == SIOCBRADDBR)
393 return br_add_bridge(net, buf);
395 return br_del_bridge(net, buf);
401 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
403 struct net_bridge *br = netdev_priv(dev);
407 return old_dev_ioctl(dev, rq, cmd);
411 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
415 br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd);