Linux 3.8-rc7
[cris-mirror.git] / net / bridge / br_sysfs_if.c
bloba1ef1b6e14dc0df71bc72bf6a5ca18bdc8d255cc
1 /*
2 * Sysfs attributes of bridge ports
3 * Linux ethernet bridge
5 * Authors:
6 * Stephen Hemminger <shemminger@osdl.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/netdevice.h>
17 #include <linux/if_bridge.h>
18 #include <linux/rtnetlink.h>
19 #include <linux/spinlock.h>
21 #include "br_private.h"
23 struct brport_attribute {
24 struct attribute attr;
25 ssize_t (*show)(struct net_bridge_port *, char *);
26 int (*store)(struct net_bridge_port *, unsigned long);
29 #define BRPORT_ATTR(_name,_mode,_show,_store) \
30 const struct brport_attribute brport_attr_##_name = { \
31 .attr = {.name = __stringify(_name), \
32 .mode = _mode }, \
33 .show = _show, \
34 .store = _store, \
37 #define BRPORT_ATTR_FLAG(_name, _mask) \
38 static ssize_t show_##_name(struct net_bridge_port *p, char *buf) \
39 { \
40 return sprintf(buf, "%d\n", !!(p->flags & _mask)); \
41 } \
42 static int store_##_name(struct net_bridge_port *p, unsigned long v) \
43 { \
44 unsigned long flags = p->flags; \
45 if (v) \
46 flags |= _mask; \
47 else \
48 flags &= ~_mask; \
49 if (flags != p->flags) { \
50 p->flags = flags; \
51 br_ifinfo_notify(RTM_NEWLINK, p); \
52 } \
53 return 0; \
54 } \
55 static BRPORT_ATTR(_name, S_IRUGO | S_IWUSR, \
56 show_##_name, store_##_name)
59 static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
61 return sprintf(buf, "%d\n", p->path_cost);
64 static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
65 show_path_cost, br_stp_set_path_cost);
67 static ssize_t show_priority(struct net_bridge_port *p, char *buf)
69 return sprintf(buf, "%d\n", p->priority);
72 static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
73 show_priority, br_stp_set_port_priority);
75 static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
77 return br_show_bridge_id(buf, &p->designated_root);
79 static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
81 static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
83 return br_show_bridge_id(buf, &p->designated_bridge);
85 static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
87 static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
89 return sprintf(buf, "%d\n", p->designated_port);
91 static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
93 static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
95 return sprintf(buf, "%d\n", p->designated_cost);
97 static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
99 static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
101 return sprintf(buf, "0x%x\n", p->port_id);
103 static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
105 static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
107 return sprintf(buf, "0x%x\n", p->port_no);
110 static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
112 static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
114 return sprintf(buf, "%d\n", p->topology_change_ack);
116 static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
118 static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
120 return sprintf(buf, "%d\n", p->config_pending);
122 static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
124 static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
126 return sprintf(buf, "%d\n", p->state);
128 static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
130 static ssize_t show_message_age_timer(struct net_bridge_port *p,
131 char *buf)
133 return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
135 static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
137 static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
138 char *buf)
140 return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
142 static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
144 static ssize_t show_hold_timer(struct net_bridge_port *p,
145 char *buf)
147 return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
149 static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
151 static int store_flush(struct net_bridge_port *p, unsigned long v)
153 br_fdb_delete_by_port(p->br, p, 0); // Don't delete local entry
154 return 0;
156 static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
158 BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
159 BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
160 BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
162 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
163 static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
165 return sprintf(buf, "%d\n", p->multicast_router);
168 static int store_multicast_router(struct net_bridge_port *p,
169 unsigned long v)
171 return br_multicast_set_port_router(p, v);
173 static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router,
174 store_multicast_router);
176 BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
177 #endif
179 static const struct brport_attribute *brport_attrs[] = {
180 &brport_attr_path_cost,
181 &brport_attr_priority,
182 &brport_attr_port_id,
183 &brport_attr_port_no,
184 &brport_attr_designated_root,
185 &brport_attr_designated_bridge,
186 &brport_attr_designated_port,
187 &brport_attr_designated_cost,
188 &brport_attr_state,
189 &brport_attr_change_ack,
190 &brport_attr_config_pending,
191 &brport_attr_message_age_timer,
192 &brport_attr_forward_delay_timer,
193 &brport_attr_hold_timer,
194 &brport_attr_flush,
195 &brport_attr_hairpin_mode,
196 &brport_attr_bpdu_guard,
197 &brport_attr_root_block,
198 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
199 &brport_attr_multicast_router,
200 &brport_attr_multicast_fast_leave,
201 #endif
202 NULL
205 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
206 #define to_brport(obj) container_of(obj, struct net_bridge_port, kobj)
208 static ssize_t brport_show(struct kobject * kobj,
209 struct attribute * attr, char * buf)
211 struct brport_attribute * brport_attr = to_brport_attr(attr);
212 struct net_bridge_port * p = to_brport(kobj);
214 return brport_attr->show(p, buf);
217 static ssize_t brport_store(struct kobject * kobj,
218 struct attribute * attr,
219 const char * buf, size_t count)
221 struct brport_attribute * brport_attr = to_brport_attr(attr);
222 struct net_bridge_port * p = to_brport(kobj);
223 ssize_t ret = -EINVAL;
224 char *endp;
225 unsigned long val;
227 if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN))
228 return -EPERM;
230 val = simple_strtoul(buf, &endp, 0);
231 if (endp != buf) {
232 if (!rtnl_trylock())
233 return restart_syscall();
234 if (p->dev && p->br && brport_attr->store) {
235 spin_lock_bh(&p->br->lock);
236 ret = brport_attr->store(p, val);
237 spin_unlock_bh(&p->br->lock);
238 if (ret == 0)
239 ret = count;
241 rtnl_unlock();
243 return ret;
246 const struct sysfs_ops brport_sysfs_ops = {
247 .show = brport_show,
248 .store = brport_store,
252 * Add sysfs entries to ethernet device added to a bridge.
253 * Creates a brport subdirectory with bridge attributes.
254 * Puts symlink in bridge's brif subdirectory
256 int br_sysfs_addif(struct net_bridge_port *p)
258 struct net_bridge *br = p->br;
259 const struct brport_attribute **a;
260 int err;
262 err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
263 SYSFS_BRIDGE_PORT_LINK);
264 if (err)
265 return err;
267 for (a = brport_attrs; *a; ++a) {
268 err = sysfs_create_file(&p->kobj, &((*a)->attr));
269 if (err)
270 return err;
273 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
274 return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
277 /* Rename bridge's brif symlink */
278 int br_sysfs_renameif(struct net_bridge_port *p)
280 struct net_bridge *br = p->br;
281 int err;
283 /* If a rename fails, the rollback will cause another
284 * rename call with the existing name.
286 if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ))
287 return 0;
289 err = sysfs_rename_link(br->ifobj, &p->kobj,
290 p->sysfs_name, p->dev->name);
291 if (err)
292 netdev_notice(br->dev, "unable to rename link %s to %s",
293 p->sysfs_name, p->dev->name);
294 else
295 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
297 return err;