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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 *); | |
26 | ssize_t (*store)(struct net_bridge_port *, unsigned long); | |
27 | }; | |
28 | ||
29 | #define BRPORT_ATTR(_name,_mode,_show,_store) \ | |
30 | struct brport_attribute brport_attr_##_name = { \ | |
31 | .attr = {.name = __stringify(_name), \ | |
7b595756 | 32 | .mode = _mode }, \ |
1da177e4 LT |
33 | .show = _show, \ |
34 | .store = _store, \ | |
35 | }; | |
36 | ||
37 | static ssize_t show_path_cost(struct net_bridge_port *p, char *buf) | |
38 | { | |
39 | return sprintf(buf, "%d\n", p->path_cost); | |
40 | } | |
41 | static ssize_t store_path_cost(struct net_bridge_port *p, unsigned long v) | |
42 | { | |
43 | br_stp_set_path_cost(p, v); | |
44 | return 0; | |
45 | } | |
46 | static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR, | |
47 | show_path_cost, store_path_cost); | |
48 | ||
49 | static ssize_t show_priority(struct net_bridge_port *p, char *buf) | |
50 | { | |
51 | return sprintf(buf, "%d\n", p->priority); | |
52 | } | |
53 | static ssize_t store_priority(struct net_bridge_port *p, unsigned long v) | |
54 | { | |
55 | if (v >= (1<<(16-BR_PORT_BITS))) | |
56 | return -ERANGE; | |
57 | br_stp_set_port_priority(p, v); | |
58 | return 0; | |
59 | } | |
60 | static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR, | |
61 | show_priority, store_priority); | |
62 | ||
63 | static ssize_t show_designated_root(struct net_bridge_port *p, char *buf) | |
64 | { | |
65 | return br_show_bridge_id(buf, &p->designated_root); | |
66 | } | |
67 | static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL); | |
68 | ||
69 | static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf) | |
70 | { | |
71 | return br_show_bridge_id(buf, &p->designated_bridge); | |
72 | } | |
73 | static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL); | |
74 | ||
75 | static ssize_t show_designated_port(struct net_bridge_port *p, char *buf) | |
76 | { | |
77 | return sprintf(buf, "%d\n", p->designated_port); | |
78 | } | |
79 | static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL); | |
80 | ||
81 | static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf) | |
82 | { | |
83 | return sprintf(buf, "%d\n", p->designated_cost); | |
84 | } | |
85 | static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL); | |
86 | ||
87 | static ssize_t show_port_id(struct net_bridge_port *p, char *buf) | |
88 | { | |
89 | return sprintf(buf, "0x%x\n", p->port_id); | |
90 | } | |
91 | static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL); | |
92 | ||
93 | static ssize_t show_port_no(struct net_bridge_port *p, char *buf) | |
94 | { | |
95 | return sprintf(buf, "0x%x\n", p->port_no); | |
96 | } | |
97 | ||
98 | static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL); | |
99 | ||
100 | static ssize_t show_change_ack(struct net_bridge_port *p, char *buf) | |
101 | { | |
102 | return sprintf(buf, "%d\n", p->topology_change_ack); | |
103 | } | |
104 | static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL); | |
105 | ||
106 | static ssize_t show_config_pending(struct net_bridge_port *p, char *buf) | |
107 | { | |
108 | return sprintf(buf, "%d\n", p->config_pending); | |
109 | } | |
110 | static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL); | |
111 | ||
112 | static ssize_t show_port_state(struct net_bridge_port *p, char *buf) | |
113 | { | |
114 | return sprintf(buf, "%d\n", p->state); | |
115 | } | |
116 | static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL); | |
117 | ||
118 | static ssize_t show_message_age_timer(struct net_bridge_port *p, | |
119 | char *buf) | |
120 | { | |
121 | return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer)); | |
122 | } | |
123 | static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL); | |
124 | ||
125 | static ssize_t show_forward_delay_timer(struct net_bridge_port *p, | |
126 | char *buf) | |
127 | { | |
128 | return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer)); | |
129 | } | |
130 | static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL); | |
131 | ||
132 | static ssize_t show_hold_timer(struct net_bridge_port *p, | |
133 | char *buf) | |
134 | { | |
135 | return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer)); | |
136 | } | |
137 | static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL); | |
138 | ||
9cf63747 SH |
139 | static ssize_t store_flush(struct net_bridge_port *p, unsigned long v) |
140 | { | |
141 | br_fdb_delete_by_port(p->br, p, 0); // Don't delete local entry | |
142 | return 0; | |
143 | } | |
144 | static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush); | |
145 | ||
3982d3d2 FA |
146 | static ssize_t show_hairpin_mode(struct net_bridge_port *p, char *buf) |
147 | { | |
148 | int hairpin_mode = (p->flags & BR_HAIRPIN_MODE) ? 1 : 0; | |
149 | return sprintf(buf, "%d\n", hairpin_mode); | |
150 | } | |
151 | static ssize_t store_hairpin_mode(struct net_bridge_port *p, unsigned long v) | |
152 | { | |
153 | if (v) | |
154 | p->flags |= BR_HAIRPIN_MODE; | |
155 | else | |
156 | p->flags &= ~BR_HAIRPIN_MODE; | |
157 | return 0; | |
158 | } | |
159 | static BRPORT_ATTR(hairpin_mode, S_IRUGO | S_IWUSR, | |
160 | show_hairpin_mode, store_hairpin_mode); | |
161 | ||
0909e117 HX |
162 | #ifdef CONFIG_BRIDGE_IGMP_SNOOPING |
163 | static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf) | |
164 | { | |
165 | return sprintf(buf, "%d\n", p->multicast_router); | |
166 | } | |
167 | ||
168 | static ssize_t store_multicast_router(struct net_bridge_port *p, | |
169 | unsigned long v) | |
170 | { | |
171 | return br_multicast_set_port_router(p, v); | |
172 | } | |
173 | static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router, | |
174 | store_multicast_router); | |
175 | #endif | |
176 | ||
1da177e4 LT |
177 | static struct brport_attribute *brport_attrs[] = { |
178 | &brport_attr_path_cost, | |
179 | &brport_attr_priority, | |
180 | &brport_attr_port_id, | |
181 | &brport_attr_port_no, | |
182 | &brport_attr_designated_root, | |
183 | &brport_attr_designated_bridge, | |
184 | &brport_attr_designated_port, | |
185 | &brport_attr_designated_cost, | |
186 | &brport_attr_state, | |
187 | &brport_attr_change_ack, | |
188 | &brport_attr_config_pending, | |
189 | &brport_attr_message_age_timer, | |
190 | &brport_attr_forward_delay_timer, | |
191 | &brport_attr_hold_timer, | |
9cf63747 | 192 | &brport_attr_flush, |
3982d3d2 | 193 | &brport_attr_hairpin_mode, |
0909e117 HX |
194 | #ifdef CONFIG_BRIDGE_IGMP_SNOOPING |
195 | &brport_attr_multicast_router, | |
196 | #endif | |
1da177e4 LT |
197 | NULL |
198 | }; | |
199 | ||
200 | #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr) | |
201 | #define to_brport(obj) container_of(obj, struct net_bridge_port, kobj) | |
202 | ||
203 | static ssize_t brport_show(struct kobject * kobj, | |
204 | struct attribute * attr, char * buf) | |
205 | { | |
206 | struct brport_attribute * brport_attr = to_brport_attr(attr); | |
207 | struct net_bridge_port * p = to_brport(kobj); | |
208 | ||
209 | return brport_attr->show(p, buf); | |
210 | } | |
211 | ||
212 | static ssize_t brport_store(struct kobject * kobj, | |
213 | struct attribute * attr, | |
214 | const char * buf, size_t count) | |
215 | { | |
216 | struct brport_attribute * brport_attr = to_brport_attr(attr); | |
217 | struct net_bridge_port * p = to_brport(kobj); | |
218 | ssize_t ret = -EINVAL; | |
219 | char *endp; | |
220 | unsigned long val; | |
221 | ||
222 | if (!capable(CAP_NET_ADMIN)) | |
223 | return -EPERM; | |
224 | ||
225 | val = simple_strtoul(buf, &endp, 0); | |
226 | if (endp != buf) { | |
af38f298 EB |
227 | if (!rtnl_trylock()) |
228 | return restart_syscall(); | |
1da177e4 LT |
229 | if (p->dev && p->br && brport_attr->store) { |
230 | spin_lock_bh(&p->br->lock); | |
231 | ret = brport_attr->store(p, val); | |
232 | spin_unlock_bh(&p->br->lock); | |
233 | if (ret == 0) | |
234 | ret = count; | |
235 | } | |
236 | rtnl_unlock(); | |
237 | } | |
238 | return ret; | |
239 | } | |
240 | ||
52cf25d0 | 241 | const struct sysfs_ops brport_sysfs_ops = { |
1da177e4 LT |
242 | .show = brport_show, |
243 | .store = brport_store, | |
244 | }; | |
245 | ||
1da177e4 LT |
246 | /* |
247 | * Add sysfs entries to ethernet device added to a bridge. | |
248 | * Creates a brport subdirectory with bridge attributes. | |
e0f43752 | 249 | * Puts symlink in bridge's brif subdirectory |
1da177e4 LT |
250 | */ |
251 | int br_sysfs_addif(struct net_bridge_port *p) | |
252 | { | |
253 | struct net_bridge *br = p->br; | |
254 | struct brport_attribute **a; | |
255 | int err; | |
256 | ||
43cb76d9 | 257 | err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj, |
1da177e4 LT |
258 | SYSFS_BRIDGE_PORT_LINK); |
259 | if (err) | |
e0f43752 | 260 | return err; |
1da177e4 LT |
261 | |
262 | for (a = brport_attrs; *a; ++a) { | |
263 | err = sysfs_create_file(&p->kobj, &((*a)->attr)); | |
264 | if (err) | |
e0f43752 | 265 | return err; |
1da177e4 LT |
266 | } |
267 | ||
e0f43752 SA |
268 | strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ); |
269 | return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name); | |
270 | } | |
271 | ||
272 | /* Rename bridge's brif symlink */ | |
273 | int br_sysfs_renameif(struct net_bridge_port *p) | |
274 | { | |
275 | struct net_bridge *br = p->br; | |
276 | int err; | |
277 | ||
278 | /* If a rename fails, the rollback will cause another | |
279 | * rename call with the existing name. | |
280 | */ | |
281 | if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ)) | |
282 | return 0; | |
283 | ||
284 | err = sysfs_rename_link(br->ifobj, &p->kobj, | |
285 | p->sysfs_name, p->dev->name); | |
286 | if (err) | |
287 | netdev_notice(br->dev, "unable to rename link %s to %s", | |
288 | p->sysfs_name, p->dev->name); | |
289 | else | |
290 | strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ); | |
291 | ||
1da177e4 LT |
292 | return err; |
293 | } |