xref: /linux/net/bridge/br_sysfs_if.c (revision 680e6ffa15103ab610c0fc1241d2f98c801b13e2)
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 #include <linux/sched/signal.h>
21 
22 #include "br_private.h"
23 
24 struct brport_attribute {
25 	struct attribute	attr;
26 	ssize_t (*show)(struct net_bridge_port *, char *);
27 	int (*store)(struct net_bridge_port *, unsigned long);
28 	int (*store_raw)(struct net_bridge_port *, char *);
29 };
30 
31 #define BRPORT_ATTR_RAW(_name, _mode, _show, _store)			\
32 const struct brport_attribute brport_attr_##_name = {			\
33 	.attr		= {.name = __stringify(_name),			\
34 			   .mode = _mode },				\
35 	.show		= _show,					\
36 	.store_raw	= _store,					\
37 };
38 
39 #define BRPORT_ATTR(_name, _mode, _show, _store)		\
40 const struct brport_attribute brport_attr_##_name = { 	        \
41 	.attr = {.name = __stringify(_name), 			\
42 		 .mode = _mode },				\
43 	.show	= _show,					\
44 	.store	= _store,					\
45 };
46 
47 #define BRPORT_ATTR_FLAG(_name, _mask)				\
48 static ssize_t show_##_name(struct net_bridge_port *p, char *buf) \
49 {								\
50 	return sprintf(buf, "%d\n", !!(p->flags & _mask));	\
51 }								\
52 static int store_##_name(struct net_bridge_port *p, unsigned long v) \
53 {								\
54 	return store_flag(p, v, _mask);				\
55 }								\
56 static BRPORT_ATTR(_name, 0644,					\
57 		   show_##_name, store_##_name)
58 
59 static int store_flag(struct net_bridge_port *p, unsigned long v,
60 		      unsigned long mask)
61 {
62 	unsigned long flags;
63 
64 	flags = p->flags;
65 
66 	if (v)
67 		flags |= mask;
68 	else
69 		flags &= ~mask;
70 
71 	if (flags != p->flags) {
72 		p->flags = flags;
73 		br_port_flags_change(p, mask);
74 	}
75 	return 0;
76 }
77 
78 static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
79 {
80 	return sprintf(buf, "%d\n", p->path_cost);
81 }
82 
83 static BRPORT_ATTR(path_cost, 0644,
84 		   show_path_cost, br_stp_set_path_cost);
85 
86 static ssize_t show_priority(struct net_bridge_port *p, char *buf)
87 {
88 	return sprintf(buf, "%d\n", p->priority);
89 }
90 
91 static BRPORT_ATTR(priority, 0644,
92 			 show_priority, br_stp_set_port_priority);
93 
94 static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
95 {
96 	return br_show_bridge_id(buf, &p->designated_root);
97 }
98 static BRPORT_ATTR(designated_root, 0444, show_designated_root, NULL);
99 
100 static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
101 {
102 	return br_show_bridge_id(buf, &p->designated_bridge);
103 }
104 static BRPORT_ATTR(designated_bridge, 0444, show_designated_bridge, NULL);
105 
106 static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
107 {
108 	return sprintf(buf, "%d\n", p->designated_port);
109 }
110 static BRPORT_ATTR(designated_port, 0444, show_designated_port, NULL);
111 
112 static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
113 {
114 	return sprintf(buf, "%d\n", p->designated_cost);
115 }
116 static BRPORT_ATTR(designated_cost, 0444, show_designated_cost, NULL);
117 
118 static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
119 {
120 	return sprintf(buf, "0x%x\n", p->port_id);
121 }
122 static BRPORT_ATTR(port_id, 0444, show_port_id, NULL);
123 
124 static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
125 {
126 	return sprintf(buf, "0x%x\n", p->port_no);
127 }
128 
129 static BRPORT_ATTR(port_no, 0444, show_port_no, NULL);
130 
131 static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
132 {
133 	return sprintf(buf, "%d\n", p->topology_change_ack);
134 }
135 static BRPORT_ATTR(change_ack, 0444, show_change_ack, NULL);
136 
137 static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
138 {
139 	return sprintf(buf, "%d\n", p->config_pending);
140 }
141 static BRPORT_ATTR(config_pending, 0444, show_config_pending, NULL);
142 
143 static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
144 {
145 	return sprintf(buf, "%d\n", p->state);
146 }
147 static BRPORT_ATTR(state, 0444, show_port_state, NULL);
148 
149 static ssize_t show_message_age_timer(struct net_bridge_port *p,
150 					    char *buf)
151 {
152 	return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
153 }
154 static BRPORT_ATTR(message_age_timer, 0444, show_message_age_timer, NULL);
155 
156 static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
157 					    char *buf)
158 {
159 	return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
160 }
161 static BRPORT_ATTR(forward_delay_timer, 0444, show_forward_delay_timer, NULL);
162 
163 static ssize_t show_hold_timer(struct net_bridge_port *p,
164 					    char *buf)
165 {
166 	return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
167 }
168 static BRPORT_ATTR(hold_timer, 0444, show_hold_timer, NULL);
169 
170 static int store_flush(struct net_bridge_port *p, unsigned long v)
171 {
172 	br_fdb_delete_by_port(p->br, p, 0, 0); // Don't delete local entry
173 	return 0;
174 }
175 static BRPORT_ATTR(flush, 0200, NULL, store_flush);
176 
177 static ssize_t show_group_fwd_mask(struct net_bridge_port *p, char *buf)
178 {
179 	return sprintf(buf, "%#x\n", p->group_fwd_mask);
180 }
181 
182 static int store_group_fwd_mask(struct net_bridge_port *p,
183 				unsigned long v)
184 {
185 	if (v & BR_GROUPFWD_MACPAUSE)
186 		return -EINVAL;
187 	p->group_fwd_mask = v;
188 
189 	return 0;
190 }
191 static BRPORT_ATTR(group_fwd_mask, 0644, show_group_fwd_mask,
192 		   store_group_fwd_mask);
193 
194 static ssize_t show_backup_port(struct net_bridge_port *p, char *buf)
195 {
196 	struct net_bridge_port *backup_p;
197 	int ret = 0;
198 
199 	rcu_read_lock();
200 	backup_p = rcu_dereference(p->backup_port);
201 	if (backup_p)
202 		ret = sprintf(buf, "%s\n", backup_p->dev->name);
203 	rcu_read_unlock();
204 
205 	return ret;
206 }
207 
208 static int store_backup_port(struct net_bridge_port *p, char *buf)
209 {
210 	struct net_device *backup_dev = NULL;
211 	char *nl = strchr(buf, '\n');
212 
213 	if (nl)
214 		*nl = '\0';
215 
216 	if (strlen(buf) > 0) {
217 		backup_dev = __dev_get_by_name(dev_net(p->dev), buf);
218 		if (!backup_dev)
219 			return -ENOENT;
220 	}
221 
222 	return nbp_backup_change(p, backup_dev);
223 }
224 static BRPORT_ATTR_RAW(backup_port, 0644, show_backup_port, store_backup_port);
225 
226 BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
227 BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
228 BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
229 BRPORT_ATTR_FLAG(learning, BR_LEARNING);
230 BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
231 BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
232 BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
233 BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
234 BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD);
235 BRPORT_ATTR_FLAG(neigh_suppress, BR_NEIGH_SUPPRESS);
236 BRPORT_ATTR_FLAG(isolated, BR_ISOLATED);
237 
238 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
239 static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
240 {
241 	return sprintf(buf, "%d\n", p->multicast_router);
242 }
243 
244 static int store_multicast_router(struct net_bridge_port *p,
245 				      unsigned long v)
246 {
247 	return br_multicast_set_port_router(p, v);
248 }
249 static BRPORT_ATTR(multicast_router, 0644, show_multicast_router,
250 		   store_multicast_router);
251 
252 BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
253 BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULTICAST_TO_UNICAST);
254 #endif
255 
256 static const struct brport_attribute *brport_attrs[] = {
257 	&brport_attr_path_cost,
258 	&brport_attr_priority,
259 	&brport_attr_port_id,
260 	&brport_attr_port_no,
261 	&brport_attr_designated_root,
262 	&brport_attr_designated_bridge,
263 	&brport_attr_designated_port,
264 	&brport_attr_designated_cost,
265 	&brport_attr_state,
266 	&brport_attr_change_ack,
267 	&brport_attr_config_pending,
268 	&brport_attr_message_age_timer,
269 	&brport_attr_forward_delay_timer,
270 	&brport_attr_hold_timer,
271 	&brport_attr_flush,
272 	&brport_attr_hairpin_mode,
273 	&brport_attr_bpdu_guard,
274 	&brport_attr_root_block,
275 	&brport_attr_learning,
276 	&brport_attr_unicast_flood,
277 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
278 	&brport_attr_multicast_router,
279 	&brport_attr_multicast_fast_leave,
280 	&brport_attr_multicast_to_unicast,
281 #endif
282 	&brport_attr_proxyarp,
283 	&brport_attr_proxyarp_wifi,
284 	&brport_attr_multicast_flood,
285 	&brport_attr_broadcast_flood,
286 	&brport_attr_group_fwd_mask,
287 	&brport_attr_neigh_suppress,
288 	&brport_attr_isolated,
289 	&brport_attr_backup_port,
290 	NULL
291 };
292 
293 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
294 
295 static ssize_t brport_show(struct kobject *kobj,
296 			   struct attribute *attr, char *buf)
297 {
298 	struct brport_attribute *brport_attr = to_brport_attr(attr);
299 	struct net_bridge_port *p = kobj_to_brport(kobj);
300 
301 	if (!brport_attr->show)
302 		return -EINVAL;
303 
304 	return brport_attr->show(p, buf);
305 }
306 
307 static ssize_t brport_store(struct kobject *kobj,
308 			    struct attribute *attr,
309 			    const char *buf, size_t count)
310 {
311 	struct brport_attribute *brport_attr = to_brport_attr(attr);
312 	struct net_bridge_port *p = kobj_to_brport(kobj);
313 	ssize_t ret = -EINVAL;
314 	unsigned long val;
315 	char *endp;
316 
317 	if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN))
318 		return -EPERM;
319 
320 	if (!rtnl_trylock())
321 		return restart_syscall();
322 
323 	if (brport_attr->store_raw) {
324 		char *buf_copy;
325 
326 		buf_copy = kstrndup(buf, count, GFP_KERNEL);
327 		if (!buf_copy) {
328 			ret = -ENOMEM;
329 			goto out_unlock;
330 		}
331 		spin_lock_bh(&p->br->lock);
332 		ret = brport_attr->store_raw(p, buf_copy);
333 		spin_unlock_bh(&p->br->lock);
334 		kfree(buf_copy);
335 	} else if (brport_attr->store) {
336 		val = simple_strtoul(buf, &endp, 0);
337 		if (endp == buf)
338 			goto out_unlock;
339 		spin_lock_bh(&p->br->lock);
340 		ret = brport_attr->store(p, val);
341 		spin_unlock_bh(&p->br->lock);
342 	}
343 
344 	if (!ret) {
345 		br_ifinfo_notify(RTM_NEWLINK, NULL, p);
346 		ret = count;
347 	}
348 out_unlock:
349 	rtnl_unlock();
350 
351 	return ret;
352 }
353 
354 const struct sysfs_ops brport_sysfs_ops = {
355 	.show = brport_show,
356 	.store = brport_store,
357 };
358 
359 /*
360  * Add sysfs entries to ethernet device added to a bridge.
361  * Creates a brport subdirectory with bridge attributes.
362  * Puts symlink in bridge's brif subdirectory
363  */
364 int br_sysfs_addif(struct net_bridge_port *p)
365 {
366 	struct net_bridge *br = p->br;
367 	const struct brport_attribute **a;
368 	int err;
369 
370 	err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
371 				SYSFS_BRIDGE_PORT_LINK);
372 	if (err)
373 		return err;
374 
375 	for (a = brport_attrs; *a; ++a) {
376 		err = sysfs_create_file(&p->kobj, &((*a)->attr));
377 		if (err)
378 			return err;
379 	}
380 
381 	strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
382 	return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
383 }
384 
385 /* Rename bridge's brif symlink */
386 int br_sysfs_renameif(struct net_bridge_port *p)
387 {
388 	struct net_bridge *br = p->br;
389 	int err;
390 
391 	/* If a rename fails, the rollback will cause another
392 	 * rename call with the existing name.
393 	 */
394 	if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ))
395 		return 0;
396 
397 	err = sysfs_rename_link(br->ifobj, &p->kobj,
398 				p->sysfs_name, p->dev->name);
399 	if (err)
400 		netdev_notice(br->dev, "unable to rename link %s to %s",
401 			      p->sysfs_name, p->dev->name);
402 	else
403 		strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
404 
405 	return err;
406 }
407