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 static int get_bridge_ifindices(struct net *net, int *indices, int num)
26 struct net_device *dev;
30 for_each_netdev_rcu(net, dev) {
33 if (dev->priv_flags & IFF_EBRIDGE)
34 indices[i++] = dev->ifindex;
41 /* called with RTNL */
42 static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
44 struct net_bridge_port *p;
46 list_for_each_entry(p, &br->port_list, list) {
48 ifindices[p->port_no] = p->dev->ifindex;
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
59 static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
60 unsigned long maxnum, unsigned long offset)
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);
70 size = maxnum * sizeof(struct __fdb_entry);
72 buf = kmalloc(size, GFP_USER);
76 num = br_fdb_fillbuf(br, buf, maxnum, offset);
78 if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
86 /* called with RTNL */
87 static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
89 struct net *net = dev_net(br->dev);
90 struct net_device *dev;
93 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
96 dev = __dev_get_by_index(net, ifindex);
101 ret = br_add_if(br, dev);
103 ret = br_del_if(br, dev);
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.
113 static int old_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
115 struct net_bridge *br = netdev_priv(dev);
116 unsigned long args[4];
118 if (copy_from_user(args, rq->ifr_data, sizeof(args)))
124 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
126 case BRCTL_GET_BRIDGE_INFO:
128 struct __bridge_info b;
130 memset(&b, 0, sizeof(struct __bridge_info));
132 memcpy(&b.designated_root, &br->designated_root, 8);
133 memcpy(&b.bridge_id, &br->bridge_id, 8);
134 b.root_path_cost = br->root_path_cost;
135 b.max_age = jiffies_to_clock_t(br->max_age);
136 b.hello_time = jiffies_to_clock_t(br->hello_time);
137 b.forward_delay = br->forward_delay;
138 b.bridge_max_age = br->bridge_max_age;
139 b.bridge_hello_time = br->bridge_hello_time;
140 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
141 b.topology_change = br->topology_change;
142 b.topology_change_detected = br->topology_change_detected;
143 b.root_port = br->root_port;
145 b.stp_enabled = (br->stp_enabled != BR_NO_STP);
146 b.ageing_time = jiffies_to_clock_t(br->ageing_time);
147 b.hello_timer_value = br_timer_value(&br->hello_timer);
148 b.tcn_timer_value = br_timer_value(&br->tcn_timer);
149 b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
150 b.gc_timer_value = br_timer_value(&br->gc_timer);
153 if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
159 case BRCTL_GET_PORT_LIST:
168 if (num > BR_MAX_PORTS)
171 indices = kcalloc(num, sizeof(int), GFP_KERNEL);
175 get_port_ifindices(br, indices, num);
176 if (copy_to_user((void __user *)args[1], indices, num*sizeof(int)))
182 case BRCTL_SET_BRIDGE_FORWARD_DELAY:
183 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
186 return br_set_forward_delay(br, args[1]);
188 case BRCTL_SET_BRIDGE_HELLO_TIME:
189 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
192 return br_set_hello_time(br, args[1]);
194 case BRCTL_SET_BRIDGE_MAX_AGE:
195 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
198 return br_set_max_age(br, args[1]);
200 case BRCTL_SET_AGEING_TIME:
201 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
204 return br_set_ageing_time(br, args[1]);
206 case BRCTL_GET_PORT_INFO:
208 struct __port_info p;
209 struct net_bridge_port *pt;
212 if ((pt = br_get_port(br, args[2])) == NULL) {
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;
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);
233 if (copy_to_user((void __user *)args[1], &p, sizeof(p)))
239 case BRCTL_SET_BRIDGE_STP_STATE:
240 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
243 br_stp_set_enabled(br, args[1]);
246 case BRCTL_SET_BRIDGE_PRIORITY:
247 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
250 br_stp_set_bridge_priority(br, args[1]);
253 case BRCTL_SET_PORT_PRIORITY:
255 struct net_bridge_port *p;
258 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
261 spin_lock_bh(&br->lock);
262 if ((p = br_get_port(br, args[1])) == NULL)
265 ret = br_stp_set_port_priority(p, args[2]);
266 spin_unlock_bh(&br->lock);
270 case BRCTL_SET_PATH_COST:
272 struct net_bridge_port *p;
275 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
278 spin_lock_bh(&br->lock);
279 if ((p = br_get_port(br, args[1])) == NULL)
282 ret = br_stp_set_path_cost(p, args[2]);
283 spin_unlock_bh(&br->lock);
288 case BRCTL_GET_FDB_ENTRIES:
289 return get_fdb_entries(br, (void __user *)args[1],
296 static int old_deviceless(struct net *net, void __user *uarg)
298 unsigned long args[3];
300 if (copy_from_user(args, uarg, sizeof(args)))
304 case BRCTL_GET_VERSION:
305 return BRCTL_VERSION;
307 case BRCTL_GET_BRIDGES:
314 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
318 args[2] = get_bridge_ifindices(net, indices, args[2]);
320 ret = copy_to_user((void __user *)args[1], indices, args[2]*sizeof(int))
327 case BRCTL_ADD_BRIDGE:
328 case BRCTL_DEL_BRIDGE:
332 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
335 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
340 if (args[0] == BRCTL_ADD_BRIDGE)
341 return br_add_bridge(net, buf);
343 return br_del_bridge(net, buf);
350 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *uarg)
355 return old_deviceless(net, uarg);
362 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
365 if (copy_from_user(buf, uarg, IFNAMSIZ))
369 if (cmd == SIOCBRADDBR)
370 return br_add_bridge(net, buf);
372 return br_del_bridge(net, buf);
378 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
380 struct net_bridge *br = netdev_priv(dev);
384 return old_dev_ioctl(dev, rq, cmd);
388 return add_del_if(br, rq->ifr_ifindex, cmd == SIOCBRADDIF);
392 br_debug(br, "Bridge does not support ioctl 0x%x\n", cmd);