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1/*
2 * Sysfs attributes of bridge ports
3 * Linux ethernet bridge
4 *
5 * Authors:
6 * Stephen Hemminger <shemminger@osdl.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/netdevice.h>
17#include <linux/if_bridge.h>
18#include <linux/rtnetlink.h>
19#include <linux/spinlock.h>
20
21#include "br_private.h"
22
23struct brport_attribute {
24 struct attribute attr;
25 ssize_t (*show)(struct net_bridge_port *, char *);
26 int (*store)(struct net_bridge_port *, unsigned long);
27};
28
29#define BRPORT_ATTR(_name, _mode, _show, _store) \
30const struct brport_attribute brport_attr_##_name = { \
31 .attr = {.name = __stringify(_name), \
32 .mode = _mode }, \
33 .show = _show, \
34 .store = _store, \
35};
36
37#define BRPORT_ATTR_FLAG(_name, _mask) \
38static ssize_t show_##_name(struct net_bridge_port *p, char *buf) \
39{ \
40 return sprintf(buf, "%d\n", !!(p->flags & _mask)); \
41} \
42static 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} \
55static BRPORT_ATTR(_name, S_IRUGO | S_IWUSR, \
56 show_##_name, store_##_name)
57
58
59static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
60{
61 return sprintf(buf, "%d\n", p->path_cost);
62}
63
64static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
65 show_path_cost, br_stp_set_path_cost);
66
67static ssize_t show_priority(struct net_bridge_port *p, char *buf)
68{
69 return sprintf(buf, "%d\n", p->priority);
70}
71
72static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
73 show_priority, br_stp_set_port_priority);
74
75static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
76{
77 return br_show_bridge_id(buf, &p->designated_root);
78}
79static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
80
81static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
82{
83 return br_show_bridge_id(buf, &p->designated_bridge);
84}
85static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
86
87static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
88{
89 return sprintf(buf, "%d\n", p->designated_port);
90}
91static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
92
93static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
94{
95 return sprintf(buf, "%d\n", p->designated_cost);
96}
97static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
98
99static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
100{
101 return sprintf(buf, "0x%x\n", p->port_id);
102}
103static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
104
105static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
106{
107 return sprintf(buf, "0x%x\n", p->port_no);
108}
109
110static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
111
112static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
113{
114 return sprintf(buf, "%d\n", p->topology_change_ack);
115}
116static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
117
118static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
119{
120 return sprintf(buf, "%d\n", p->config_pending);
121}
122static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
123
124static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
125{
126 return sprintf(buf, "%d\n", p->state);
127}
128static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
129
130static ssize_t show_message_age_timer(struct net_bridge_port *p,
131 char *buf)
132{
133 return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
134}
135static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
136
137static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
138 char *buf)
139{
140 return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
141}
142static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
143
144static ssize_t show_hold_timer(struct net_bridge_port *p,
145 char *buf)
146{
147 return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
148}
149static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
150
151static int store_flush(struct net_bridge_port *p, unsigned long v)
152{
153 br_fdb_delete_by_port(p->br, p, 0); // Don't delete local entry
154 return 0;
155}
156static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
157
158BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
159BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
160BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
161BRPORT_ATTR_FLAG(learning, BR_LEARNING);
162BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
163
164#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
165static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
166{
167 return sprintf(buf, "%d\n", p->multicast_router);
168}
169
170static int store_multicast_router(struct net_bridge_port *p,
171 unsigned long v)
172{
173 return br_multicast_set_port_router(p, v);
174}
175static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router,
176 store_multicast_router);
177
178BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
179#endif
180
181static const struct brport_attribute *brport_attrs[] = {
182 &brport_attr_path_cost,
183 &brport_attr_priority,
184 &brport_attr_port_id,
185 &brport_attr_port_no,
186 &brport_attr_designated_root,
187 &brport_attr_designated_bridge,
188 &brport_attr_designated_port,
189 &brport_attr_designated_cost,
190 &brport_attr_state,
191 &brport_attr_change_ack,
192 &brport_attr_config_pending,
193 &brport_attr_message_age_timer,
194 &brport_attr_forward_delay_timer,
195 &brport_attr_hold_timer,
196 &brport_attr_flush,
197 &brport_attr_hairpin_mode,
198 &brport_attr_bpdu_guard,
199 &brport_attr_root_block,
200 &brport_attr_learning,
201 &brport_attr_unicast_flood,
202#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
203 &brport_attr_multicast_router,
204 &brport_attr_multicast_fast_leave,
205#endif
206 NULL
207};
208
209#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
210#define to_brport(obj) container_of(obj, struct net_bridge_port, kobj)
211
212static ssize_t brport_show(struct kobject *kobj,
213 struct attribute *attr, char *buf)
214{
215 struct brport_attribute *brport_attr = to_brport_attr(attr);
216 struct net_bridge_port *p = to_brport(kobj);
217
218 return brport_attr->show(p, buf);
219}
220
221static ssize_t brport_store(struct kobject *kobj,
222 struct attribute *attr,
223 const char *buf, size_t count)
224{
225 struct brport_attribute *brport_attr = to_brport_attr(attr);
226 struct net_bridge_port *p = to_brport(kobj);
227 ssize_t ret = -EINVAL;
228 char *endp;
229 unsigned long val;
230
231 if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN))
232 return -EPERM;
233
234 val = simple_strtoul(buf, &endp, 0);
235 if (endp != buf) {
236 if (!rtnl_trylock())
237 return restart_syscall();
238 if (p->dev && p->br && brport_attr->store) {
239 spin_lock_bh(&p->br->lock);
240 ret = brport_attr->store(p, val);
241 spin_unlock_bh(&p->br->lock);
242 if (ret == 0)
243 ret = count;
244 }
245 rtnl_unlock();
246 }
247 return ret;
248}
249
250const struct sysfs_ops brport_sysfs_ops = {
251 .show = brport_show,
252 .store = brport_store,
253};
254
255/*
256 * Add sysfs entries to ethernet device added to a bridge.
257 * Creates a brport subdirectory with bridge attributes.
258 * Puts symlink in bridge's brif subdirectory
259 */
260int br_sysfs_addif(struct net_bridge_port *p)
261{
262 struct net_bridge *br = p->br;
263 const struct brport_attribute **a;
264 int err;
265
266 err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
267 SYSFS_BRIDGE_PORT_LINK);
268 if (err)
269 return err;
270
271 for (a = brport_attrs; *a; ++a) {
272 err = sysfs_create_file(&p->kobj, &((*a)->attr));
273 if (err)
274 return err;
275 }
276
277 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
278 return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
279}
280
281/* Rename bridge's brif symlink */
282int br_sysfs_renameif(struct net_bridge_port *p)
283{
284 struct net_bridge *br = p->br;
285 int err;
286
287 /* If a rename fails, the rollback will cause another
288 * rename call with the existing name.
289 */
290 if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ))
291 return 0;
292
293 err = sysfs_rename_link(br->ifobj, &p->kobj,
294 p->sysfs_name, p->dev->name);
295 if (err)
296 netdev_notice(br->dev, "unable to rename link %s to %s",
297 p->sysfs_name, p->dev->name);
298 else
299 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
300
301 return err;
302}