GNU Linux-libre 4.19.314-gnu1
[releases.git] / net / bridge / br_sysfs_if.c
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 = p->flags;
63         int err;
64
65         if (v)
66                 flags |= mask;
67         else
68                 flags &= ~mask;
69
70         if (flags != p->flags) {
71                 err = br_switchdev_set_port_flag(p, flags, mask);
72                 if (err)
73                         return err;
74
75                 p->flags = flags;
76                 br_port_flags_change(p, mask);
77         }
78         return 0;
79 }
80
81 static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
82 {
83         return sprintf(buf, "%d\n", p->path_cost);
84 }
85
86 static BRPORT_ATTR(path_cost, 0644,
87                    show_path_cost, br_stp_set_path_cost);
88
89 static ssize_t show_priority(struct net_bridge_port *p, char *buf)
90 {
91         return sprintf(buf, "%d\n", p->priority);
92 }
93
94 static BRPORT_ATTR(priority, 0644,
95                          show_priority, br_stp_set_port_priority);
96
97 static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
98 {
99         return br_show_bridge_id(buf, &p->designated_root);
100 }
101 static BRPORT_ATTR(designated_root, 0444, show_designated_root, NULL);
102
103 static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
104 {
105         return br_show_bridge_id(buf, &p->designated_bridge);
106 }
107 static BRPORT_ATTR(designated_bridge, 0444, show_designated_bridge, NULL);
108
109 static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
110 {
111         return sprintf(buf, "%d\n", p->designated_port);
112 }
113 static BRPORT_ATTR(designated_port, 0444, show_designated_port, NULL);
114
115 static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
116 {
117         return sprintf(buf, "%d\n", p->designated_cost);
118 }
119 static BRPORT_ATTR(designated_cost, 0444, show_designated_cost, NULL);
120
121 static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
122 {
123         return sprintf(buf, "0x%x\n", p->port_id);
124 }
125 static BRPORT_ATTR(port_id, 0444, show_port_id, NULL);
126
127 static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
128 {
129         return sprintf(buf, "0x%x\n", p->port_no);
130 }
131
132 static BRPORT_ATTR(port_no, 0444, show_port_no, NULL);
133
134 static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
135 {
136         return sprintf(buf, "%d\n", p->topology_change_ack);
137 }
138 static BRPORT_ATTR(change_ack, 0444, show_change_ack, NULL);
139
140 static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
141 {
142         return sprintf(buf, "%d\n", p->config_pending);
143 }
144 static BRPORT_ATTR(config_pending, 0444, show_config_pending, NULL);
145
146 static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
147 {
148         return sprintf(buf, "%d\n", p->state);
149 }
150 static BRPORT_ATTR(state, 0444, show_port_state, NULL);
151
152 static ssize_t show_message_age_timer(struct net_bridge_port *p,
153                                             char *buf)
154 {
155         return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
156 }
157 static BRPORT_ATTR(message_age_timer, 0444, show_message_age_timer, NULL);
158
159 static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
160                                             char *buf)
161 {
162         return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
163 }
164 static BRPORT_ATTR(forward_delay_timer, 0444, show_forward_delay_timer, NULL);
165
166 static ssize_t show_hold_timer(struct net_bridge_port *p,
167                                             char *buf)
168 {
169         return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
170 }
171 static BRPORT_ATTR(hold_timer, 0444, show_hold_timer, NULL);
172
173 static int store_flush(struct net_bridge_port *p, unsigned long v)
174 {
175         br_fdb_delete_by_port(p->br, p, 0, 0); // Don't delete local entry
176         return 0;
177 }
178 static BRPORT_ATTR(flush, 0200, NULL, store_flush);
179
180 static ssize_t show_group_fwd_mask(struct net_bridge_port *p, char *buf)
181 {
182         return sprintf(buf, "%#x\n", p->group_fwd_mask);
183 }
184
185 static int store_group_fwd_mask(struct net_bridge_port *p,
186                                 unsigned long v)
187 {
188         if (v & BR_GROUPFWD_MACPAUSE)
189                 return -EINVAL;
190         p->group_fwd_mask = v;
191
192         return 0;
193 }
194 static BRPORT_ATTR(group_fwd_mask, 0644, show_group_fwd_mask,
195                    store_group_fwd_mask);
196
197 static ssize_t show_backup_port(struct net_bridge_port *p, char *buf)
198 {
199         struct net_bridge_port *backup_p;
200         int ret = 0;
201
202         rcu_read_lock();
203         backup_p = rcu_dereference(p->backup_port);
204         if (backup_p)
205                 ret = sprintf(buf, "%s\n", backup_p->dev->name);
206         rcu_read_unlock();
207
208         return ret;
209 }
210
211 static int store_backup_port(struct net_bridge_port *p, char *buf)
212 {
213         struct net_device *backup_dev = NULL;
214         char *nl = strchr(buf, '\n');
215
216         if (nl)
217                 *nl = '\0';
218
219         if (strlen(buf) > 0) {
220                 backup_dev = __dev_get_by_name(dev_net(p->dev), buf);
221                 if (!backup_dev)
222                         return -ENOENT;
223         }
224
225         return nbp_backup_change(p, backup_dev);
226 }
227 static BRPORT_ATTR_RAW(backup_port, 0644, show_backup_port, store_backup_port);
228
229 BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
230 BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
231 BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
232 BRPORT_ATTR_FLAG(learning, BR_LEARNING);
233 BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
234 BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
235 BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
236 BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
237 BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD);
238 BRPORT_ATTR_FLAG(neigh_suppress, BR_NEIGH_SUPPRESS);
239 BRPORT_ATTR_FLAG(isolated, BR_ISOLATED);
240
241 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
242 static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
243 {
244         return sprintf(buf, "%d\n", p->multicast_router);
245 }
246
247 static int store_multicast_router(struct net_bridge_port *p,
248                                       unsigned long v)
249 {
250         return br_multicast_set_port_router(p, v);
251 }
252 static BRPORT_ATTR(multicast_router, 0644, show_multicast_router,
253                    store_multicast_router);
254
255 BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
256 BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULTICAST_TO_UNICAST);
257 #endif
258
259 static const struct brport_attribute *brport_attrs[] = {
260         &brport_attr_path_cost,
261         &brport_attr_priority,
262         &brport_attr_port_id,
263         &brport_attr_port_no,
264         &brport_attr_designated_root,
265         &brport_attr_designated_bridge,
266         &brport_attr_designated_port,
267         &brport_attr_designated_cost,
268         &brport_attr_state,
269         &brport_attr_change_ack,
270         &brport_attr_config_pending,
271         &brport_attr_message_age_timer,
272         &brport_attr_forward_delay_timer,
273         &brport_attr_hold_timer,
274         &brport_attr_flush,
275         &brport_attr_hairpin_mode,
276         &brport_attr_bpdu_guard,
277         &brport_attr_root_block,
278         &brport_attr_learning,
279         &brport_attr_unicast_flood,
280 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
281         &brport_attr_multicast_router,
282         &brport_attr_multicast_fast_leave,
283         &brport_attr_multicast_to_unicast,
284 #endif
285         &brport_attr_proxyarp,
286         &brport_attr_proxyarp_wifi,
287         &brport_attr_multicast_flood,
288         &brport_attr_broadcast_flood,
289         &brport_attr_group_fwd_mask,
290         &brport_attr_neigh_suppress,
291         &brport_attr_isolated,
292         &brport_attr_backup_port,
293         NULL
294 };
295
296 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
297
298 static ssize_t brport_show(struct kobject *kobj,
299                            struct attribute *attr, char *buf)
300 {
301         struct brport_attribute *brport_attr = to_brport_attr(attr);
302         struct net_bridge_port *p = kobj_to_brport(kobj);
303
304         if (!brport_attr->show)
305                 return -EINVAL;
306
307         return brport_attr->show(p, buf);
308 }
309
310 static ssize_t brport_store(struct kobject *kobj,
311                             struct attribute *attr,
312                             const char *buf, size_t count)
313 {
314         struct brport_attribute *brport_attr = to_brport_attr(attr);
315         struct net_bridge_port *p = kobj_to_brport(kobj);
316         ssize_t ret = -EINVAL;
317         unsigned long val;
318         char *endp;
319
320         if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN))
321                 return -EPERM;
322
323         if (!rtnl_trylock())
324                 return restart_syscall();
325
326         if (!p->dev || !p->br)
327                 goto out_unlock;
328
329         if (brport_attr->store_raw) {
330                 char *buf_copy;
331
332                 buf_copy = kstrndup(buf, count, GFP_KERNEL);
333                 if (!buf_copy) {
334                         ret = -ENOMEM;
335                         goto out_unlock;
336                 }
337                 spin_lock_bh(&p->br->lock);
338                 ret = brport_attr->store_raw(p, buf_copy);
339                 spin_unlock_bh(&p->br->lock);
340                 kfree(buf_copy);
341         } else if (brport_attr->store) {
342                 val = simple_strtoul(buf, &endp, 0);
343                 if (endp == buf)
344                         goto out_unlock;
345                 spin_lock_bh(&p->br->lock);
346                 ret = brport_attr->store(p, val);
347                 spin_unlock_bh(&p->br->lock);
348         }
349
350         if (!ret) {
351                 br_ifinfo_notify(RTM_NEWLINK, NULL, p);
352                 ret = count;
353         }
354 out_unlock:
355         rtnl_unlock();
356
357         return ret;
358 }
359
360 const struct sysfs_ops brport_sysfs_ops = {
361         .show = brport_show,
362         .store = brport_store,
363 };
364
365 /*
366  * Add sysfs entries to ethernet device added to a bridge.
367  * Creates a brport subdirectory with bridge attributes.
368  * Puts symlink in bridge's brif subdirectory
369  */
370 int br_sysfs_addif(struct net_bridge_port *p)
371 {
372         struct net_bridge *br = p->br;
373         const struct brport_attribute **a;
374         int err;
375
376         err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
377                                 SYSFS_BRIDGE_PORT_LINK);
378         if (err)
379                 return err;
380
381         for (a = brport_attrs; *a; ++a) {
382                 err = sysfs_create_file(&p->kobj, &((*a)->attr));
383                 if (err)
384                         return err;
385         }
386
387         strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
388         return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
389 }
390
391 /* Rename bridge's brif symlink */
392 int br_sysfs_renameif(struct net_bridge_port *p)
393 {
394         struct net_bridge *br = p->br;
395         int err;
396
397         /* If a rename fails, the rollback will cause another
398          * rename call with the existing name.
399          */
400         if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ))
401                 return 0;
402
403         err = sysfs_rename_link(br->ifobj, &p->kobj,
404                                 p->sysfs_name, p->dev->name);
405         if (err)
406                 netdev_notice(br->dev, "unable to rename link %s to %s",
407                               p->sysfs_name, p->dev->name);
408         else
409                 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
410
411         return err;
412 }