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Linux/net/bridge/br_sysfs_if.c

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  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 
 21 #include "br_private.h"
 22 
 23 struct brport_attribute {
 24         struct attribute        attr;
 25         ssize_t (*show)(struct net_bridge_port *, char *);
 26         int (*store)(struct net_bridge_port *, unsigned long);
 27 };
 28 
 29 #define BRPORT_ATTR(_name, _mode, _show, _store)                \
 30 const struct brport_attribute brport_attr_##_name = {           \
 31         .attr = {.name = __stringify(_name),                    \
 32                  .mode = _mode },                               \
 33         .show   = _show,                                        \
 34         .store  = _store,                                       \
 35 };
 36 
 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         return store_flag(p, v, _mask);                         \
 45 }                                                               \
 46 static BRPORT_ATTR(_name, S_IRUGO | S_IWUSR,                    \
 47                    show_##_name, store_##_name)
 48 
 49 static int store_flag(struct net_bridge_port *p, unsigned long v,
 50                       unsigned long mask)
 51 {
 52         unsigned long flags;
 53 
 54         flags = p->flags;
 55 
 56         if (v)
 57                 flags |= mask;
 58         else
 59                 flags &= ~mask;
 60 
 61         if (flags != p->flags) {
 62                 p->flags = flags;
 63                 br_port_flags_change(p, mask);
 64                 br_ifinfo_notify(RTM_NEWLINK, p);
 65         }
 66         return 0;
 67 }
 68 
 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 }
 73 
 74 static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
 75                    show_path_cost, br_stp_set_path_cost);
 76 
 77 static ssize_t show_priority(struct net_bridge_port *p, char *buf)
 78 {
 79         return sprintf(buf, "%d\n", p->priority);
 80 }
 81 
 82 static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
 83                          show_priority, br_stp_set_port_priority);
 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 
161 static int store_flush(struct net_bridge_port *p, unsigned long v)
162 {
163         br_fdb_delete_by_port(p->br, p, 0, 0); // Don't delete local entry
164         return 0;
165 }
166 static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
167 
168 BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
169 BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
170 BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
171 BRPORT_ATTR_FLAG(learning, BR_LEARNING);
172 BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
173 BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
174 BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
175 
176 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
177 static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
178 {
179         return sprintf(buf, "%d\n", p->multicast_router);
180 }
181 
182 static int store_multicast_router(struct net_bridge_port *p,
183                                       unsigned long v)
184 {
185         return br_multicast_set_port_router(p, v);
186 }
187 static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router,
188                    store_multicast_router);
189 
190 BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
191 #endif
192 
193 static const struct brport_attribute *brport_attrs[] = {
194         &brport_attr_path_cost,
195         &brport_attr_priority,
196         &brport_attr_port_id,
197         &brport_attr_port_no,
198         &brport_attr_designated_root,
199         &brport_attr_designated_bridge,
200         &brport_attr_designated_port,
201         &brport_attr_designated_cost,
202         &brport_attr_state,
203         &brport_attr_change_ack,
204         &brport_attr_config_pending,
205         &brport_attr_message_age_timer,
206         &brport_attr_forward_delay_timer,
207         &brport_attr_hold_timer,
208         &brport_attr_flush,
209         &brport_attr_hairpin_mode,
210         &brport_attr_bpdu_guard,
211         &brport_attr_root_block,
212         &brport_attr_learning,
213         &brport_attr_unicast_flood,
214 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
215         &brport_attr_multicast_router,
216         &brport_attr_multicast_fast_leave,
217 #endif
218         &brport_attr_proxyarp,
219         &brport_attr_proxyarp_wifi,
220         NULL
221 };
222 
223 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
224 #define to_brport(obj)  container_of(obj, struct net_bridge_port, kobj)
225 
226 static ssize_t brport_show(struct kobject *kobj,
227                            struct attribute *attr, char *buf)
228 {
229         struct brport_attribute *brport_attr = to_brport_attr(attr);
230         struct net_bridge_port *p = to_brport(kobj);
231 
232         return brport_attr->show(p, buf);
233 }
234 
235 static ssize_t brport_store(struct kobject *kobj,
236                             struct attribute *attr,
237                             const char *buf, size_t count)
238 {
239         struct brport_attribute *brport_attr = to_brport_attr(attr);
240         struct net_bridge_port *p = to_brport(kobj);
241         ssize_t ret = -EINVAL;
242         char *endp;
243         unsigned long val;
244 
245         if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN))
246                 return -EPERM;
247 
248         val = simple_strtoul(buf, &endp, 0);
249         if (endp != buf) {
250                 if (!rtnl_trylock())
251                         return restart_syscall();
252                 if (p->dev && p->br && brport_attr->store) {
253                         spin_lock_bh(&p->br->lock);
254                         ret = brport_attr->store(p, val);
255                         spin_unlock_bh(&p->br->lock);
256                         if (ret == 0)
257                                 ret = count;
258                 }
259                 rtnl_unlock();
260         }
261         return ret;
262 }
263 
264 const struct sysfs_ops brport_sysfs_ops = {
265         .show = brport_show,
266         .store = brport_store,
267 };
268 
269 /*
270  * Add sysfs entries to ethernet device added to a bridge.
271  * Creates a brport subdirectory with bridge attributes.
272  * Puts symlink in bridge's brif subdirectory
273  */
274 int br_sysfs_addif(struct net_bridge_port *p)
275 {
276         struct net_bridge *br = p->br;
277         const struct brport_attribute **a;
278         int err;
279 
280         err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
281                                 SYSFS_BRIDGE_PORT_LINK);
282         if (err)
283                 return err;
284 
285         for (a = brport_attrs; *a; ++a) {
286                 err = sysfs_create_file(&p->kobj, &((*a)->attr));
287                 if (err)
288                         return err;
289         }
290 
291         strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
292         return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
293 }
294 
295 /* Rename bridge's brif symlink */
296 int br_sysfs_renameif(struct net_bridge_port *p)
297 {
298         struct net_bridge *br = p->br;
299         int err;
300 
301         /* If a rename fails, the rollback will cause another
302          * rename call with the existing name.
303          */
304         if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ))
305                 return 0;
306 
307         err = sysfs_rename_link(br->ifobj, &p->kobj,
308                                 p->sysfs_name, p->dev->name);
309         if (err)
310                 netdev_notice(br->dev, "unable to rename link %s to %s",
311                               p->sysfs_name, p->dev->name);
312         else
313                 strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
314 
315         return err;
316 }
317 

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