1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Linux ethernet bridge
7 * Lennert Buytenhek <buytenh@gnu.org>
10 #include <linux/capability.h>
11 #include <linux/kernel.h>
12 #include <linux/if_bridge.h>
13 #include <linux/netdevice.h>
14 #include <linux/slab.h>
15 #include <linux/times.h>
16 #include <net/net_namespace.h>
17 #include <linux/uaccess.h>
18 #include "br_private.h"
20 static int get_bridge_ifindices(struct net *net, int *indices, int num)
22 struct net_device *dev;
26 for_each_netdev_rcu(net, dev) {
29 if (netif_is_bridge_master(dev))
30 indices[i++] = dev->ifindex;
37 /* called with RTNL */
38 static void get_port_ifindices(struct net_bridge *br, int *ifindices, int num)
40 struct net_bridge_port *p;
42 list_for_each_entry(p, &br->port_list, list) {
44 ifindices[p->port_no] = p->dev->ifindex;
49 * Format up to a page worth of forwarding table entries
50 * userbuf -- where to copy result
51 * maxnum -- maximum number of entries desired
52 * (limited to a page for sanity)
53 * offset -- number of records to skip
55 static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
56 unsigned long maxnum, unsigned long offset)
62 /* Clamp size to PAGE_SIZE, test maxnum to avoid overflow */
63 if (maxnum > PAGE_SIZE/sizeof(struct __fdb_entry))
64 maxnum = PAGE_SIZE/sizeof(struct __fdb_entry);
66 size = maxnum * sizeof(struct __fdb_entry);
68 buf = kmalloc(size, GFP_USER);
72 num = br_fdb_fillbuf(br, buf, maxnum, offset);
74 if (copy_to_user(userbuf, buf,
75 array_size(num, sizeof(struct __fdb_entry))))
83 /* called with RTNL */
84 static int add_del_if(struct net_bridge *br, int ifindex, int isadd)
86 struct net *net = dev_net(br->dev);
87 struct net_device *dev;
90 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
93 dev = __dev_get_by_index(net, ifindex);
98 ret = br_add_if(br, dev, NULL);
100 ret = br_del_if(br, dev);
106 * Legacy ioctl's through SIOCDEVPRIVATE
107 * This interface is deprecated because it was too difficult
108 * to do the translation for 32/64bit ioctl compatibility.
110 int br_dev_siocdevprivate(struct net_device *dev, struct ifreq *rq, void __user *data, int cmd)
112 struct net_bridge *br = netdev_priv(dev);
113 struct net_bridge_port *p = NULL;
114 unsigned long args[4];
116 int ret = -EOPNOTSUPP;
118 if (in_compat_syscall()) {
119 unsigned int cargs[4];
121 if (copy_from_user(cargs, data, sizeof(cargs)))
129 argp = compat_ptr(args[1]);
131 if (copy_from_user(args, data, sizeof(args)))
134 argp = (void __user *)args[1];
140 return add_del_if(br, args[1], args[0] == BRCTL_ADD_IF);
142 case BRCTL_GET_BRIDGE_INFO:
144 struct __bridge_info b;
146 memset(&b, 0, sizeof(struct __bridge_info));
148 memcpy(&b.designated_root, &br->designated_root, 8);
149 memcpy(&b.bridge_id, &br->bridge_id, 8);
150 b.root_path_cost = br->root_path_cost;
151 b.max_age = jiffies_to_clock_t(br->max_age);
152 b.hello_time = jiffies_to_clock_t(br->hello_time);
153 b.forward_delay = br->forward_delay;
154 b.bridge_max_age = br->bridge_max_age;
155 b.bridge_hello_time = br->bridge_hello_time;
156 b.bridge_forward_delay = jiffies_to_clock_t(br->bridge_forward_delay);
157 b.topology_change = br->topology_change;
158 b.topology_change_detected = br->topology_change_detected;
159 b.root_port = br->root_port;
161 b.stp_enabled = (br->stp_enabled != BR_NO_STP);
162 b.ageing_time = jiffies_to_clock_t(br->ageing_time);
163 b.hello_timer_value = br_timer_value(&br->hello_timer);
164 b.tcn_timer_value = br_timer_value(&br->tcn_timer);
165 b.topology_change_timer_value = br_timer_value(&br->topology_change_timer);
166 b.gc_timer_value = br_timer_value(&br->gc_work.timer);
169 if (copy_to_user((void __user *)args[1], &b, sizeof(b)))
175 case BRCTL_GET_PORT_LIST:
184 if (num > BR_MAX_PORTS)
187 indices = kcalloc(num, sizeof(int), GFP_KERNEL);
191 get_port_ifindices(br, indices, num);
192 if (copy_to_user(argp, indices, array_size(num, sizeof(int))))
198 case BRCTL_SET_BRIDGE_FORWARD_DELAY:
199 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
202 ret = br_set_forward_delay(br, args[1]);
205 case BRCTL_SET_BRIDGE_HELLO_TIME:
206 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
209 ret = br_set_hello_time(br, args[1]);
212 case BRCTL_SET_BRIDGE_MAX_AGE:
213 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
216 ret = br_set_max_age(br, args[1]);
219 case BRCTL_SET_AGEING_TIME:
220 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
223 ret = br_set_ageing_time(br, 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(argp, &p, sizeof(p)))
259 case BRCTL_SET_BRIDGE_STP_STATE:
260 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
263 ret = br_stp_set_enabled(br, args[1], NULL);
266 case BRCTL_SET_BRIDGE_PRIORITY:
267 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
270 br_stp_set_bridge_priority(br, args[1]);
274 case BRCTL_SET_PORT_PRIORITY:
276 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
279 spin_lock_bh(&br->lock);
280 if ((p = br_get_port(br, args[1])) == NULL)
283 ret = br_stp_set_port_priority(p, args[2]);
284 spin_unlock_bh(&br->lock);
288 case BRCTL_SET_PATH_COST:
290 if (!ns_capable(dev_net(dev)->user_ns, CAP_NET_ADMIN))
293 spin_lock_bh(&br->lock);
294 if ((p = br_get_port(br, args[1])) == NULL)
297 ret = br_stp_set_path_cost(p, args[2]);
298 spin_unlock_bh(&br->lock);
302 case BRCTL_GET_FDB_ENTRIES:
303 return get_fdb_entries(br, argp, args[2], args[3]);
308 br_ifinfo_notify(RTM_NEWLINK, NULL, p);
310 netdev_state_change(br->dev);
316 static int old_deviceless(struct net *net, void __user *uarg)
318 unsigned long args[3];
320 if (copy_from_user(args, uarg, sizeof(args)))
324 case BRCTL_GET_VERSION:
325 return BRCTL_VERSION;
327 case BRCTL_GET_BRIDGES:
334 indices = kcalloc(args[2], sizeof(int), GFP_KERNEL);
338 args[2] = get_bridge_ifindices(net, indices, args[2]);
340 ret = copy_to_user((void __user *)args[1], indices,
341 array_size(args[2], sizeof(int)))
348 case BRCTL_ADD_BRIDGE:
349 case BRCTL_DEL_BRIDGE:
353 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
356 if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
361 if (args[0] == BRCTL_ADD_BRIDGE)
362 return br_add_bridge(net, buf);
364 return br_del_bridge(net, buf);
371 int br_ioctl_stub(struct net *net, struct net_bridge *br, unsigned int cmd,
372 struct ifreq *ifr, void __user *uarg)
374 int ret = -EOPNOTSUPP;
381 ret = old_deviceless(net, uarg);
388 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) {
393 if (copy_from_user(buf, uarg, IFNAMSIZ)) {
399 if (cmd == SIOCBRADDBR)
400 ret = br_add_bridge(net, buf);
402 ret = br_del_bridge(net, buf);
407 ret = add_del_if(br, ifr->ifr_ifindex, cmd == SIOCBRADDIF);