aboutsummaryrefslogtreecommitdiff
path: root/net/bridge/br_sysfs_if.c
blob: 72e92376eef1591e22b640ce3b6b5497e33db8fd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *	Sysfs attributes of bridge ports
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Stephen Hemminger		<shemminger@osdl.org>
 */

#include <linux/capability.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/if_bridge.h>
#include <linux/rtnetlink.h>
#include <linux/spinlock.h>
#include <linux/sched/signal.h>

#include "br_private.h"

/* IMPORTANT: new bridge port options must be added with netlink support only
 *            please do not add new sysfs entries
 */

struct brport_attribute {
	struct attribute	attr;
	ssize_t (*show)(struct net_bridge_port *, char *);
	int (*store)(struct net_bridge_port *, unsigned long);
	int (*store_raw)(struct net_bridge_port *, char *);
};

#define BRPORT_ATTR_RAW(_name, _mode, _show, _store)			\
const struct brport_attribute brport_attr_##_name = {			\
	.attr		= {.name = __stringify(_name),			\
			   .mode = _mode },				\
	.show		= _show,					\
	.store_raw	= _store,					\
};

#define BRPORT_ATTR(_name, _mode, _show, _store)		\
const struct brport_attribute brport_attr_##_name = { 	        \
	.attr = {.name = __stringify(_name), 			\
		 .mode = _mode },				\
	.show	= _show,					\
	.store	= _store,					\
};

#define BRPORT_ATTR_FLAG(_name, _mask)				\
static ssize_t show_##_name(struct net_bridge_port *p, char *buf) \
{								\
	return sprintf(buf, "%d\n", !!(p->flags & _mask));	\
}								\
static int store_##_name(struct net_bridge_port *p, unsigned long v) \
{								\
	return store_flag(p, v, _mask);				\
}								\
static BRPORT_ATTR(_name, 0644,					\
		   show_##_name, store_##_name)

static int store_flag(struct net_bridge_port *p, unsigned long v,
		      unsigned long mask)
{
	struct netlink_ext_ack extack = {0};
	unsigned long flags = p->flags;
	int err;

	if (v)
		flags |= mask;
	else
		flags &= ~mask;

	if (flags != p->flags) {
		err = br_switchdev_set_port_flag(p, flags, mask, &extack);
		if (err) {
			netdev_err(p->dev, "%s\n", extack._msg);
			return err;
		}

		p->flags = flags;
		br_port_flags_change(p, mask);
	}
	return 0;
}

static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%d\n", p->path_cost);
}

static BRPORT_ATTR(path_cost, 0644,
		   show_path_cost, br_stp_set_path_cost);

static ssize_t show_priority(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%d\n", p->priority);
}

static BRPORT_ATTR(priority, 0644,
			 show_priority, br_stp_set_port_priority);

static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
{
	return br_show_bridge_id(buf, &p->designated_root);
}
static BRPORT_ATTR(designated_root, 0444, show_designated_root, NULL);

static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
{
	return br_show_bridge_id(buf, &p->designated_bridge);
}
static BRPORT_ATTR(designated_bridge, 0444, show_designated_bridge, NULL);

static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%d\n", p->designated_port);
}
static BRPORT_ATTR(designated_port, 0444, show_designated_port, NULL);

static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%d\n", p->designated_cost);
}
static BRPORT_ATTR(designated_cost, 0444, show_designated_cost, NULL);

static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "0x%x\n", p->port_id);
}
static BRPORT_ATTR(port_id, 0444, show_port_id, NULL);

static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "0x%x\n", p->port_no);
}

static BRPORT_ATTR(port_no, 0444, show_port_no, NULL);

static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%d\n", p->topology_change_ack);
}
static BRPORT_ATTR(change_ack, 0444, show_change_ack, NULL);

static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%d\n", p->config_pending);
}
static BRPORT_ATTR(config_pending, 0444, show_config_pending, NULL);

static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%d\n", p->state);
}
static BRPORT_ATTR(state, 0444, show_port_state, NULL);

static ssize_t show_message_age_timer(struct net_bridge_port *p,
					    char *buf)
{
	return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
}
static BRPORT_ATTR(message_age_timer, 0444, show_message_age_timer, NULL);

static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
					    char *buf)
{
	return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
}
static BRPORT_ATTR(forward_delay_timer, 0444, show_forward_delay_timer, NULL);

static ssize_t show_hold_timer(struct net_bridge_port *p,
					    char *buf)
{
	return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
}
static BRPORT_ATTR(hold_timer, 0444, show_hold_timer, NULL);

static int store_flush(struct net_bridge_port *p, unsigned long v)
{
	br_fdb_delete_by_port(p->br, p, 0, 0); // Don't delete local entry
	return 0;
}
static BRPORT_ATTR(flush, 0200, NULL, store_flush);

static ssize_t show_group_fwd_mask(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%#x\n", p->group_fwd_mask);
}

static int store_group_fwd_mask(struct net_bridge_port *p,
				unsigned long v)
{
	if (v & BR_GROUPFWD_MACPAUSE)
		return -EINVAL;
	p->group_fwd_mask = v;

	return 0;
}
static BRPORT_ATTR(group_fwd_mask, 0644, show_group_fwd_mask,
		   store_group_fwd_mask);

static ssize_t show_backup_port(struct net_bridge_port *p, char *buf)
{
	struct net_bridge_port *backup_p;
	int ret = 0;

	rcu_read_lock();
	backup_p = rcu_dereference(p->backup_port);
	if (backup_p)
		ret = sprintf(buf, "%s\n", backup_p->dev->name);
	rcu_read_unlock();

	return ret;
}

static int store_backup_port(struct net_bridge_port *p, char *buf)
{
	struct net_device *backup_dev = NULL;
	char *nl = strchr(buf, '\n');

	if (nl)
		*nl = '\0';

	if (strlen(buf) > 0) {
		backup_dev = __dev_get_by_name(dev_net(p->dev), buf);
		if (!backup_dev)
			return -ENOENT;
	}

	return nbp_backup_change(p, backup_dev);
}
static BRPORT_ATTR_RAW(backup_port, 0644, show_backup_port, store_backup_port);

BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
BRPORT_ATTR_FLAG(learning, BR_LEARNING);
BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD);
BRPORT_ATTR_FLAG(neigh_suppress, BR_NEIGH_SUPPRESS);
BRPORT_ATTR_FLAG(isolated, BR_ISOLATED);

#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%d\n", p->multicast_router);
}

static int store_multicast_router(struct net_bridge_port *p,
				      unsigned long v)
{
	return br_multicast_set_port_router(p, v);
}
static BRPORT_ATTR(multicast_router, 0644, show_multicast_router,
		   store_multicast_router);

BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULTICAST_TO_UNICAST);
#endif

static const struct brport_attribute *brport_attrs[] = {
	&brport_attr_path_cost,
	&brport_attr_priority,
	&brport_attr_port_id,
	&brport_attr_port_no,
	&brport_attr_designated_root,
	&brport_attr_designated_bridge,
	&brport_attr_designated_port,
	&brport_attr_designated_cost,
	&brport_attr_state,
	&brport_attr_change_ack,
	&brport_attr_config_pending,
	&brport_attr_message_age_timer,
	&brport_attr_forward_delay_timer,
	&brport_attr_hold_timer,
	&brport_attr_flush,
	&brport_attr_hairpin_mode,
	&brport_attr_bpdu_guard,
	&brport_attr_root_block,
	&brport_attr_learning,
	&brport_attr_unicast_flood,
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	&brport_attr_multicast_router,
	&brport_attr_multicast_fast_leave,
	&brport_attr_multicast_to_unicast,
#endif
	&brport_attr_proxyarp,
	&brport_attr_proxyarp_wifi,
	&brport_attr_multicast_flood,
	&brport_attr_broadcast_flood,
	&brport_attr_group_fwd_mask,
	&brport_attr_neigh_suppress,
	&brport_attr_isolated,
	&brport_attr_backup_port,
	NULL
};

#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)

static ssize_t brport_show(struct kobject *kobj,
			   struct attribute *attr, char *buf)
{
	struct brport_attribute *brport_attr = to_brport_attr(attr);
	struct net_bridge_port *p = kobj_to_brport(kobj);

	if (!brport_attr->show)
		return -EINVAL;

	return brport_attr->show(p, buf);
}

static ssize_t brport_store(struct kobject *kobj,
			    struct attribute *attr,
			    const char *buf, size_t count)
{
	struct brport_attribute *brport_attr = to_brport_attr(attr);
	struct net_bridge_port *p = kobj_to_brport(kobj);
	ssize_t ret = -EINVAL;
	unsigned long val;
	char *endp;

	if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN))
		return -EPERM;

	if (!rtnl_trylock())
		return restart_syscall();

	if (brport_attr->store_raw) {
		char *buf_copy;

		buf_copy = kstrndup(buf, count, GFP_KERNEL);
		if (!buf_copy) {
			ret = -ENOMEM;
			goto out_unlock;
		}
		spin_lock_bh(&p->br->lock);
		ret = brport_attr->store_raw(p, buf_copy);
		spin_unlock_bh(&p->br->lock);
		kfree(buf_copy);
	} else if (brport_attr->store) {
		val = simple_strtoul(buf, &endp, 0);
		if (endp == buf)
			goto out_unlock;
		spin_lock_bh(&p->br->lock);
		ret = brport_attr->store(p, val);
		spin_unlock_bh(&p->br->lock);
	}

	if (!ret) {
		br_ifinfo_notify(RTM_NEWLINK, NULL, p);
		ret = count;
	}
out_unlock:
	rtnl_unlock();

	return ret;
}

const struct sysfs_ops brport_sysfs_ops = {
	.show = brport_show,
	.store = brport_store,
};

/*
 * Add sysfs entries to ethernet device added to a bridge.
 * Creates a brport subdirectory with bridge attributes.
 * Puts symlink in bridge's brif subdirectory
 */
int br_sysfs_addif(struct net_bridge_port *p)
{
	struct net_bridge *br = p->br;
	const struct brport_attribute **a;
	int err;

	err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
				SYSFS_BRIDGE_PORT_LINK);
	if (err)
		return err;

	for (a = brport_attrs; *a; ++a) {
		err = sysfs_create_file(&p->kobj, &((*a)->attr));
		if (err)
			return err;
	}

	strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
	return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
}

/* Rename bridge's brif symlink */
int br_sysfs_renameif(struct net_bridge_port *p)
{
	struct net_bridge *br = p->br;
	int err;

	/* If a rename fails, the rollback will cause another
	 * rename call with the existing name.
	 */
	if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ))
		return 0;

	err = sysfs_rename_link(br->ifobj, &p->kobj,
				p->sysfs_name, p->dev->name);
	if (err)
		netdev_notice(br->dev, "unable to rename link %s to %s",
			      p->sysfs_name, p->dev->name);
	else
		strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);

	return err;
}