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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 | ||
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 | { \ | |
44 | unsigned long flags = p->flags; \ | |
45 | if (v) \ | |
46 | flags |= _mask; \ | |
47 | else \ | |
48 | flags &= ~_mask; \ | |
49 | if (flags != p->flags) { \ | |
50 | p->flags = flags; \ | |
51 | br_ifinfo_notify(RTM_NEWLINK, p); \ | |
52 | } \ | |
53 | return 0; \ | |
54 | } \ | |
55 | static BRPORT_ATTR(_name, S_IRUGO | S_IWUSR, \ | |
56 | show_##_name, store_##_name) | |
57 | ||
58 | ||
1da177e4 LT |
59 | static ssize_t show_path_cost(struct net_bridge_port *p, char *buf) |
60 | { | |
61 | return sprintf(buf, "%d\n", p->path_cost); | |
62 | } | |
14f98f25 | 63 | |
1da177e4 | 64 | static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR, |
14f98f25 | 65 | show_path_cost, br_stp_set_path_cost); |
1da177e4 LT |
66 | |
67 | static ssize_t show_priority(struct net_bridge_port *p, char *buf) | |
68 | { | |
69 | return sprintf(buf, "%d\n", p->priority); | |
70 | } | |
14f98f25 | 71 | |
1da177e4 | 72 | static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR, |
14f98f25 | 73 | show_priority, br_stp_set_port_priority); |
1da177e4 LT |
74 | |
75 | static ssize_t show_designated_root(struct net_bridge_port *p, char *buf) | |
76 | { | |
77 | return br_show_bridge_id(buf, &p->designated_root); | |
78 | } | |
79 | static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL); | |
80 | ||
81 | static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf) | |
82 | { | |
83 | return br_show_bridge_id(buf, &p->designated_bridge); | |
84 | } | |
85 | static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL); | |
86 | ||
87 | static ssize_t show_designated_port(struct net_bridge_port *p, char *buf) | |
88 | { | |
89 | return sprintf(buf, "%d\n", p->designated_port); | |
90 | } | |
91 | static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL); | |
92 | ||
93 | static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf) | |
94 | { | |
95 | return sprintf(buf, "%d\n", p->designated_cost); | |
96 | } | |
97 | static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL); | |
98 | ||
99 | static ssize_t show_port_id(struct net_bridge_port *p, char *buf) | |
100 | { | |
101 | return sprintf(buf, "0x%x\n", p->port_id); | |
102 | } | |
103 | static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL); | |
104 | ||
105 | static ssize_t show_port_no(struct net_bridge_port *p, char *buf) | |
106 | { | |
107 | return sprintf(buf, "0x%x\n", p->port_no); | |
108 | } | |
109 | ||
110 | static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL); | |
111 | ||
112 | static ssize_t show_change_ack(struct net_bridge_port *p, char *buf) | |
113 | { | |
114 | return sprintf(buf, "%d\n", p->topology_change_ack); | |
115 | } | |
116 | static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL); | |
117 | ||
118 | static ssize_t show_config_pending(struct net_bridge_port *p, char *buf) | |
119 | { | |
120 | return sprintf(buf, "%d\n", p->config_pending); | |
121 | } | |
122 | static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL); | |
123 | ||
124 | static ssize_t show_port_state(struct net_bridge_port *p, char *buf) | |
125 | { | |
126 | return sprintf(buf, "%d\n", p->state); | |
127 | } | |
128 | static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL); | |
129 | ||
130 | static ssize_t show_message_age_timer(struct net_bridge_port *p, | |
131 | char *buf) | |
132 | { | |
133 | return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer)); | |
134 | } | |
135 | static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL); | |
136 | ||
137 | static ssize_t show_forward_delay_timer(struct net_bridge_port *p, | |
138 | char *buf) | |
139 | { | |
140 | return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer)); | |
141 | } | |
142 | static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL); | |
143 | ||
144 | static ssize_t show_hold_timer(struct net_bridge_port *p, | |
145 | char *buf) | |
146 | { | |
147 | return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer)); | |
148 | } | |
149 | static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL); | |
150 | ||
14f98f25 | 151 | static int store_flush(struct net_bridge_port *p, unsigned long v) |
9cf63747 SH |
152 | { |
153 | br_fdb_delete_by_port(p->br, p, 0); // Don't delete local entry | |
154 | return 0; | |
155 | } | |
156 | static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush); | |
157 | ||
cd753732 | 158 | BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE); |
a2e01a65 | 159 | BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD); |
1007dd1a | 160 | BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK); |
3982d3d2 | 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 | ||
14f98f25 | 168 | static int store_multicast_router(struct net_bridge_port *p, |
0909e117 HX |
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 | ||
5a0d513b | 177 | static const struct brport_attribute *brport_attrs[] = { |
1da177e4 LT |
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, |
a2e01a65 | 194 | &brport_attr_bpdu_guard, |
1007dd1a | 195 | &brport_attr_root_block, |
0909e117 HX |
196 | #ifdef CONFIG_BRIDGE_IGMP_SNOOPING |
197 | &brport_attr_multicast_router, | |
198 | #endif | |
1da177e4 LT |
199 | NULL |
200 | }; | |
201 | ||
202 | #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr) | |
203 | #define to_brport(obj) container_of(obj, struct net_bridge_port, kobj) | |
204 | ||
205 | static ssize_t brport_show(struct kobject * kobj, | |
206 | struct attribute * attr, char * buf) | |
207 | { | |
208 | struct brport_attribute * brport_attr = to_brport_attr(attr); | |
209 | struct net_bridge_port * p = to_brport(kobj); | |
210 | ||
211 | return brport_attr->show(p, buf); | |
212 | } | |
213 | ||
214 | static ssize_t brport_store(struct kobject * kobj, | |
215 | struct attribute * attr, | |
216 | const char * buf, size_t count) | |
217 | { | |
218 | struct brport_attribute * brport_attr = to_brport_attr(attr); | |
219 | struct net_bridge_port * p = to_brport(kobj); | |
220 | ssize_t ret = -EINVAL; | |
221 | char *endp; | |
222 | unsigned long val; | |
223 | ||
224 | if (!capable(CAP_NET_ADMIN)) | |
225 | return -EPERM; | |
226 | ||
227 | val = simple_strtoul(buf, &endp, 0); | |
228 | if (endp != buf) { | |
af38f298 EB |
229 | if (!rtnl_trylock()) |
230 | return restart_syscall(); | |
1da177e4 LT |
231 | if (p->dev && p->br && brport_attr->store) { |
232 | spin_lock_bh(&p->br->lock); | |
233 | ret = brport_attr->store(p, val); | |
234 | spin_unlock_bh(&p->br->lock); | |
235 | if (ret == 0) | |
236 | ret = count; | |
237 | } | |
238 | rtnl_unlock(); | |
239 | } | |
240 | return ret; | |
241 | } | |
242 | ||
52cf25d0 | 243 | const struct sysfs_ops brport_sysfs_ops = { |
1da177e4 LT |
244 | .show = brport_show, |
245 | .store = brport_store, | |
246 | }; | |
247 | ||
1da177e4 LT |
248 | /* |
249 | * Add sysfs entries to ethernet device added to a bridge. | |
250 | * Creates a brport subdirectory with bridge attributes. | |
e0f43752 | 251 | * Puts symlink in bridge's brif subdirectory |
1da177e4 LT |
252 | */ |
253 | int br_sysfs_addif(struct net_bridge_port *p) | |
254 | { | |
255 | struct net_bridge *br = p->br; | |
5a0d513b | 256 | const struct brport_attribute **a; |
1da177e4 LT |
257 | int err; |
258 | ||
43cb76d9 | 259 | err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj, |
1da177e4 LT |
260 | SYSFS_BRIDGE_PORT_LINK); |
261 | if (err) | |
e0f43752 | 262 | return err; |
1da177e4 LT |
263 | |
264 | for (a = brport_attrs; *a; ++a) { | |
265 | err = sysfs_create_file(&p->kobj, &((*a)->attr)); | |
266 | if (err) | |
e0f43752 | 267 | return err; |
1da177e4 LT |
268 | } |
269 | ||
e0f43752 SA |
270 | strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ); |
271 | return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name); | |
272 | } | |
273 | ||
274 | /* Rename bridge's brif symlink */ | |
275 | int br_sysfs_renameif(struct net_bridge_port *p) | |
276 | { | |
277 | struct net_bridge *br = p->br; | |
278 | int err; | |
279 | ||
280 | /* If a rename fails, the rollback will cause another | |
281 | * rename call with the existing name. | |
282 | */ | |
283 | if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ)) | |
284 | return 0; | |
285 | ||
286 | err = sysfs_rename_link(br->ifobj, &p->kobj, | |
287 | p->sysfs_name, p->dev->name); | |
288 | if (err) | |
289 | netdev_notice(br->dev, "unable to rename link %s to %s", | |
290 | p->sysfs_name, p->dev->name); | |
291 | else | |
292 | strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ); | |
293 | ||
1da177e4 LT |
294 | return err; |
295 | } |