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1da177e4 LT |
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 | ||
4fc268d2 | 14 | #include <linux/capability.h> |
1da177e4 LT |
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 *); | |
14f98f25 | 26 | int (*store)(struct net_bridge_port *, unsigned long); |
1da177e4 LT |
27 | }; |
28 | ||
31a5b837 | 29 | #define BRPORT_ATTR(_name, _mode, _show, _store) \ |
5a0d513b | 30 | const struct brport_attribute brport_attr_##_name = { \ |
1da177e4 | 31 | .attr = {.name = __stringify(_name), \ |
7b595756 | 32 | .mode = _mode }, \ |
1da177e4 LT |
33 | .show = _show, \ |
34 | .store = _store, \ | |
35 | }; | |
36 | ||
cd753732 | 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 | { \ | |
63c3a622 | 44 | return store_flag(p, v, _mask); \ |
cd753732 | 45 | } \ |
46 | static BRPORT_ATTR(_name, S_IRUGO | S_IWUSR, \ | |
47 | show_##_name, store_##_name) | |
48 | ||
63c3a622 VY |
49 | static int store_flag(struct net_bridge_port *p, unsigned long v, |
50 | unsigned long mask) | |
51 | { | |
e028e4b8 VY |
52 | unsigned long flags; |
53 | ||
54 | flags = p->flags; | |
63c3a622 VY |
55 | |
56 | if (v) | |
57 | flags |= mask; | |
58 | else | |
59 | flags &= ~mask; | |
60 | ||
61 | if (flags != p->flags) { | |
62 | p->flags = flags; | |
e028e4b8 | 63 | br_port_flags_change(p, mask); |
63c3a622 VY |
64 | br_ifinfo_notify(RTM_NEWLINK, p); |
65 | } | |
66 | return 0; | |
67 | } | |
cd753732 | 68 | |
1da177e4 LT |
69 | static ssize_t show_path_cost(struct net_bridge_port *p, char *buf) |
70 | { | |
71 | return sprintf(buf, "%d\n", p->path_cost); | |
72 | } | |
14f98f25 | 73 | |
1da177e4 | 74 | static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR, |
14f98f25 | 75 | show_path_cost, br_stp_set_path_cost); |
1da177e4 LT |
76 | |
77 | static ssize_t show_priority(struct net_bridge_port *p, char *buf) | |
78 | { | |
79 | return sprintf(buf, "%d\n", p->priority); | |
80 | } | |
14f98f25 | 81 | |
1da177e4 | 82 | static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR, |
14f98f25 | 83 | show_priority, br_stp_set_port_priority); |
1da177e4 LT |
84 | |
85 | static ssize_t show_designated_root(struct net_bridge_port *p, char *buf) | |
86 | { | |
87 | return br_show_bridge_id(buf, &p->designated_root); | |
88 | } | |
89 | static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL); | |
90 | ||
91 | static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf) | |
92 | { | |
93 | return br_show_bridge_id(buf, &p->designated_bridge); | |
94 | } | |
95 | static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL); | |
96 | ||
97 | static ssize_t show_designated_port(struct net_bridge_port *p, char *buf) | |
98 | { | |
99 | return sprintf(buf, "%d\n", p->designated_port); | |
100 | } | |
101 | static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL); | |
102 | ||
103 | static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf) | |
104 | { | |
105 | return sprintf(buf, "%d\n", p->designated_cost); | |
106 | } | |
107 | static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL); | |
108 | ||
109 | static ssize_t show_port_id(struct net_bridge_port *p, char *buf) | |
110 | { | |
111 | return sprintf(buf, "0x%x\n", p->port_id); | |
112 | } | |
113 | static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL); | |
114 | ||
115 | static ssize_t show_port_no(struct net_bridge_port *p, char *buf) | |
116 | { | |
117 | return sprintf(buf, "0x%x\n", p->port_no); | |
118 | } | |
119 | ||
120 | static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL); | |
121 | ||
122 | static ssize_t show_change_ack(struct net_bridge_port *p, char *buf) | |
123 | { | |
124 | return sprintf(buf, "%d\n", p->topology_change_ack); | |
125 | } | |
126 | static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL); | |
127 | ||
128 | static ssize_t show_config_pending(struct net_bridge_port *p, char *buf) | |
129 | { | |
130 | return sprintf(buf, "%d\n", p->config_pending); | |
131 | } | |
132 | static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL); | |
133 | ||
134 | static ssize_t show_port_state(struct net_bridge_port *p, char *buf) | |
135 | { | |
136 | return sprintf(buf, "%d\n", p->state); | |
137 | } | |
138 | static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL); | |
139 | ||
140 | static ssize_t show_message_age_timer(struct net_bridge_port *p, | |
141 | char *buf) | |
142 | { | |
143 | return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer)); | |
144 | } | |
145 | static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL); | |
146 | ||
147 | static ssize_t show_forward_delay_timer(struct net_bridge_port *p, | |
148 | char *buf) | |
149 | { | |
150 | return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer)); | |
151 | } | |
152 | static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL); | |
153 | ||
154 | static ssize_t show_hold_timer(struct net_bridge_port *p, | |
155 | char *buf) | |
156 | { | |
157 | return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer)); | |
158 | } | |
159 | static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL); | |
160 | ||
14f98f25 | 161 | static int store_flush(struct net_bridge_port *p, unsigned long v) |
9cf63747 SH |
162 | { |
163 | br_fdb_delete_by_port(p->br, p, 0); // Don't delete local entry | |
164 | return 0; | |
165 | } | |
166 | static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush); | |
167 | ||
cd753732 | 168 | BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE); |
a2e01a65 | 169 | BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD); |
1007dd1a | 170 | BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK); |
9ba18891 | 171 | BRPORT_ATTR_FLAG(learning, BR_LEARNING); |
867a5943 | 172 | BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD); |
95850116 | 173 | BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP); |
3982d3d2 | 174 | |
0909e117 HX |
175 | #ifdef CONFIG_BRIDGE_IGMP_SNOOPING |
176 | static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf) | |
177 | { | |
178 | return sprintf(buf, "%d\n", p->multicast_router); | |
179 | } | |
180 | ||
14f98f25 | 181 | static int store_multicast_router(struct net_bridge_port *p, |
0909e117 HX |
182 | unsigned long v) |
183 | { | |
184 | return br_multicast_set_port_router(p, v); | |
185 | } | |
186 | static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router, | |
187 | store_multicast_router); | |
50426b59 | 188 | |
c2d3babf | 189 | BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE); |
0909e117 HX |
190 | #endif |
191 | ||
5a0d513b | 192 | static const struct brport_attribute *brport_attrs[] = { |
1da177e4 LT |
193 | &brport_attr_path_cost, |
194 | &brport_attr_priority, | |
195 | &brport_attr_port_id, | |
196 | &brport_attr_port_no, | |
197 | &brport_attr_designated_root, | |
198 | &brport_attr_designated_bridge, | |
199 | &brport_attr_designated_port, | |
200 | &brport_attr_designated_cost, | |
201 | &brport_attr_state, | |
202 | &brport_attr_change_ack, | |
203 | &brport_attr_config_pending, | |
204 | &brport_attr_message_age_timer, | |
205 | &brport_attr_forward_delay_timer, | |
206 | &brport_attr_hold_timer, | |
9cf63747 | 207 | &brport_attr_flush, |
3982d3d2 | 208 | &brport_attr_hairpin_mode, |
a2e01a65 | 209 | &brport_attr_bpdu_guard, |
1007dd1a | 210 | &brport_attr_root_block, |
9ba18891 | 211 | &brport_attr_learning, |
867a5943 | 212 | &brport_attr_unicast_flood, |
0909e117 HX |
213 | #ifdef CONFIG_BRIDGE_IGMP_SNOOPING |
214 | &brport_attr_multicast_router, | |
50426b59 | 215 | &brport_attr_multicast_fast_leave, |
0909e117 | 216 | #endif |
95850116 | 217 | &brport_attr_proxyarp, |
1da177e4 LT |
218 | NULL |
219 | }; | |
220 | ||
221 | #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr) | |
222 | #define to_brport(obj) container_of(obj, struct net_bridge_port, kobj) | |
223 | ||
56b148eb | 224 | static ssize_t brport_show(struct kobject *kobj, |
225 | struct attribute *attr, char *buf) | |
1da177e4 | 226 | { |
56b148eb | 227 | struct brport_attribute *brport_attr = to_brport_attr(attr); |
228 | struct net_bridge_port *p = to_brport(kobj); | |
1da177e4 LT |
229 | |
230 | return brport_attr->show(p, buf); | |
231 | } | |
232 | ||
56b148eb | 233 | static ssize_t brport_store(struct kobject *kobj, |
234 | struct attribute *attr, | |
235 | const char *buf, size_t count) | |
1da177e4 | 236 | { |
56b148eb | 237 | struct brport_attribute *brport_attr = to_brport_attr(attr); |
238 | struct net_bridge_port *p = to_brport(kobj); | |
1da177e4 LT |
239 | ssize_t ret = -EINVAL; |
240 | char *endp; | |
241 | unsigned long val; | |
242 | ||
cb990503 | 243 | if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
244 | return -EPERM; |
245 | ||
246 | val = simple_strtoul(buf, &endp, 0); | |
247 | if (endp != buf) { | |
af38f298 EB |
248 | if (!rtnl_trylock()) |
249 | return restart_syscall(); | |
1da177e4 LT |
250 | if (p->dev && p->br && brport_attr->store) { |
251 | spin_lock_bh(&p->br->lock); | |
252 | ret = brport_attr->store(p, val); | |
253 | spin_unlock_bh(&p->br->lock); | |
254 | if (ret == 0) | |
255 | ret = count; | |
256 | } | |
257 | rtnl_unlock(); | |
258 | } | |
259 | return ret; | |
260 | } | |
261 | ||
52cf25d0 | 262 | const struct sysfs_ops brport_sysfs_ops = { |
1da177e4 LT |
263 | .show = brport_show, |
264 | .store = brport_store, | |
265 | }; | |
266 | ||
1da177e4 LT |
267 | /* |
268 | * Add sysfs entries to ethernet device added to a bridge. | |
269 | * Creates a brport subdirectory with bridge attributes. | |
e0f43752 | 270 | * Puts symlink in bridge's brif subdirectory |
1da177e4 LT |
271 | */ |
272 | int br_sysfs_addif(struct net_bridge_port *p) | |
273 | { | |
274 | struct net_bridge *br = p->br; | |
5a0d513b | 275 | const struct brport_attribute **a; |
1da177e4 LT |
276 | int err; |
277 | ||
43cb76d9 | 278 | err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj, |
1da177e4 LT |
279 | SYSFS_BRIDGE_PORT_LINK); |
280 | if (err) | |
e0f43752 | 281 | return err; |
1da177e4 LT |
282 | |
283 | for (a = brport_attrs; *a; ++a) { | |
284 | err = sysfs_create_file(&p->kobj, &((*a)->attr)); | |
285 | if (err) | |
e0f43752 | 286 | return err; |
1da177e4 LT |
287 | } |
288 | ||
e0f43752 SA |
289 | strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ); |
290 | return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name); | |
291 | } | |
292 | ||
293 | /* Rename bridge's brif symlink */ | |
294 | int br_sysfs_renameif(struct net_bridge_port *p) | |
295 | { | |
296 | struct net_bridge *br = p->br; | |
297 | int err; | |
298 | ||
299 | /* If a rename fails, the rollback will cause another | |
300 | * rename call with the existing name. | |
301 | */ | |
302 | if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ)) | |
303 | return 0; | |
304 | ||
305 | err = sysfs_rename_link(br->ifobj, &p->kobj, | |
306 | p->sysfs_name, p->dev->name); | |
307 | if (err) | |
308 | netdev_notice(br->dev, "unable to rename link %s to %s", | |
309 | p->sysfs_name, p->dev->name); | |
310 | else | |
311 | strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ); | |
312 | ||
1da177e4 LT |
313 | return err; |
314 | } |