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
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);
27 };
28
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, \
35 };
36
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 return store_flag(p, v, _mask); \
45 } \
46 static BRPORT_ATTR(_name, S_IRUGO | S_IWUSR, \
47 show_##_name, store_##_name)
48
store_flag(struct net_bridge_port * p,unsigned long v,unsigned long mask)49 static int store_flag(struct net_bridge_port *p, unsigned long v,
50 unsigned long mask)
51 {
52 unsigned long flags;
53
54 flags = p->flags;
55
56 if (v)
57 flags |= mask;
58 else
59 flags &= ~mask;
60
61 if (flags != p->flags) {
62 p->flags = flags;
63 br_port_flags_change(p, mask);
64 }
65 return 0;
66 }
67
show_path_cost(struct net_bridge_port * p,char * buf)68 static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
69 {
70 return sprintf(buf, "%d\n", p->path_cost);
71 }
72
73 static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
74 show_path_cost, br_stp_set_path_cost);
75
show_priority(struct net_bridge_port * p,char * buf)76 static ssize_t show_priority(struct net_bridge_port *p, char *buf)
77 {
78 return sprintf(buf, "%d\n", p->priority);
79 }
80
81 static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
82 show_priority, br_stp_set_port_priority);
83
show_designated_root(struct net_bridge_port * p,char * buf)84 static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
85 {
86 return br_show_bridge_id(buf, &p->designated_root);
87 }
88 static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
89
show_designated_bridge(struct net_bridge_port * p,char * buf)90 static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
91 {
92 return br_show_bridge_id(buf, &p->designated_bridge);
93 }
94 static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
95
show_designated_port(struct net_bridge_port * p,char * buf)96 static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
97 {
98 return sprintf(buf, "%d\n", p->designated_port);
99 }
100 static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
101
show_designated_cost(struct net_bridge_port * p,char * buf)102 static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
103 {
104 return sprintf(buf, "%d\n", p->designated_cost);
105 }
106 static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
107
show_port_id(struct net_bridge_port * p,char * buf)108 static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
109 {
110 return sprintf(buf, "0x%x\n", p->port_id);
111 }
112 static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
113
show_port_no(struct net_bridge_port * p,char * buf)114 static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
115 {
116 return sprintf(buf, "0x%x\n", p->port_no);
117 }
118
119 static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
120
show_change_ack(struct net_bridge_port * p,char * buf)121 static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
122 {
123 return sprintf(buf, "%d\n", p->topology_change_ack);
124 }
125 static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
126
show_config_pending(struct net_bridge_port * p,char * buf)127 static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
128 {
129 return sprintf(buf, "%d\n", p->config_pending);
130 }
131 static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
132
show_port_state(struct net_bridge_port * p,char * buf)133 static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
134 {
135 return sprintf(buf, "%d\n", p->state);
136 }
137 static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
138
show_message_age_timer(struct net_bridge_port * p,char * buf)139 static ssize_t show_message_age_timer(struct net_bridge_port *p,
140 char *buf)
141 {
142 return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
143 }
144 static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
145
show_forward_delay_timer(struct net_bridge_port * p,char * buf)146 static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
147 char *buf)
148 {
149 return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
150 }
151 static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
152
show_hold_timer(struct net_bridge_port * p,char * buf)153 static ssize_t show_hold_timer(struct net_bridge_port *p,
154 char *buf)
155 {
156 return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
157 }
158 static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
159
store_flush(struct net_bridge_port * p,unsigned long v)160 static int store_flush(struct net_bridge_port *p, unsigned long v)
161 {
162 br_fdb_delete_by_port(p->br, p, 0, 0); // Don't delete local entry
163 return 0;
164 }
165 static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
166
167 BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
168 BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
169 BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
170 BRPORT_ATTR_FLAG(learning, BR_LEARNING);
171 BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
172 BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
173 BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
174 BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
175
176 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
show_multicast_router(struct net_bridge_port * p,char * buf)177 static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
178 {
179 return sprintf(buf, "%d\n", p->multicast_router);
180 }
181
store_multicast_router(struct net_bridge_port * p,unsigned long v)182 static int store_multicast_router(struct net_bridge_port *p,
183 unsigned long v)
184 {
185 return br_multicast_set_port_router(p, v);
186 }
187 static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router,
188 store_multicast_router);
189
190 BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
191 #endif
192
193 static const struct brport_attribute *brport_attrs[] = {
194 &brport_attr_path_cost,
195 &brport_attr_priority,
196 &brport_attr_port_id,
197 &brport_attr_port_no,
198 &brport_attr_designated_root,
199 &brport_attr_designated_bridge,
200 &brport_attr_designated_port,
201 &brport_attr_designated_cost,
202 &brport_attr_state,
203 &brport_attr_change_ack,
204 &brport_attr_config_pending,
205 &brport_attr_message_age_timer,
206 &brport_attr_forward_delay_timer,
207 &brport_attr_hold_timer,
208 &brport_attr_flush,
209 &brport_attr_hairpin_mode,
210 &brport_attr_bpdu_guard,
211 &brport_attr_root_block,
212 &brport_attr_learning,
213 &brport_attr_unicast_flood,
214 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
215 &brport_attr_multicast_router,
216 &brport_attr_multicast_fast_leave,
217 #endif
218 &brport_attr_proxyarp,
219 &brport_attr_proxyarp_wifi,
220 &brport_attr_multicast_flood,
221 NULL
222 };
223
224 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
225 #define to_brport(obj) container_of(obj, struct net_bridge_port, kobj)
226
brport_show(struct kobject * kobj,struct attribute * attr,char * buf)227 static ssize_t brport_show(struct kobject *kobj,
228 struct attribute *attr, char *buf)
229 {
230 struct brport_attribute *brport_attr = to_brport_attr(attr);
231 struct net_bridge_port *p = to_brport(kobj);
232
233 if (!brport_attr->show)
234 return -EINVAL;
235
236 return brport_attr->show(p, buf);
237 }
238
brport_store(struct kobject * kobj,struct attribute * attr,const char * buf,size_t count)239 static ssize_t brport_store(struct kobject *kobj,
240 struct attribute *attr,
241 const char *buf, size_t count)
242 {
243 struct brport_attribute *brport_attr = to_brport_attr(attr);
244 struct net_bridge_port *p = to_brport(kobj);
245 ssize_t ret = -EINVAL;
246 char *endp;
247 unsigned long val;
248
249 if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN))
250 return -EPERM;
251
252 val = simple_strtoul(buf, &endp, 0);
253 if (endp != buf) {
254 if (!rtnl_trylock())
255 return restart_syscall();
256 if (p->dev && p->br && brport_attr->store) {
257 spin_lock_bh(&p->br->lock);
258 ret = brport_attr->store(p, val);
259 spin_unlock_bh(&p->br->lock);
260 if (!ret) {
261 br_ifinfo_notify(RTM_NEWLINK, p);
262 ret = count;
263 }
264 }
265 rtnl_unlock();
266 }
267 return ret;
268 }
269
270 const struct sysfs_ops brport_sysfs_ops = {
271 .show = brport_show,
272 .store = brport_store,
273 };
274
275 /*
276 * Add sysfs entries to ethernet device added to a bridge.
277 * Creates a brport subdirectory with bridge attributes.
278 * Puts symlink in bridge's brif subdirectory
279 */
br_sysfs_addif(struct net_bridge_port * p)280 int br_sysfs_addif(struct net_bridge_port *p)
281 {
282 struct net_bridge *br = p->br;
283 const struct brport_attribute **a;
284 int err;
285
286 err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
287 SYSFS_BRIDGE_PORT_LINK);
288 if (err)
289 return err;
290
291 for (a = brport_attrs; *a; ++a) {
292 err = sysfs_create_file(&p->kobj, &((*a)->attr));
293 if (err)
294 return err;
295 }
296
297 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
298 return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
299 }
300
301 /* Rename bridge's brif symlink */
br_sysfs_renameif(struct net_bridge_port * p)302 int br_sysfs_renameif(struct net_bridge_port *p)
303 {
304 struct net_bridge *br = p->br;
305 int err;
306
307 /* If a rename fails, the rollback will cause another
308 * rename call with the existing name.
309 */
310 if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ))
311 return 0;
312
313 err = sysfs_rename_link(br->ifobj, &p->kobj,
314 p->sysfs_name, p->dev->name);
315 if (err)
316 netdev_notice(br->dev, "unable to rename link %s to %s",
317 p->sysfs_name, p->dev->name);
318 else
319 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
320
321 return err;
322 }
323