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
  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),                    \
  32                  .mode = _mode },                               \
  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
 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
 146 static struct brport_attribute *brport_attrs[] = {
 147         &brport_attr_path_cost,
 148         &brport_attr_priority,
 149         &brport_attr_port_id,
 150         &brport_attr_port_no,
 151         &brport_attr_designated_root,
 152         &brport_attr_designated_bridge,
 153         &brport_attr_designated_port,
 154         &brport_attr_designated_cost,
 155         &brport_attr_state,
 156         &brport_attr_change_ack,
 157         &brport_attr_config_pending,
 158         &brport_attr_message_age_timer,
 159         &brport_attr_forward_delay_timer,
 160         &brport_attr_hold_timer,
 161         &brport_attr_flush,
 162         NULL
 163 };
 164
 165 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
 166 #define to_brport(obj)  container_of(obj, struct net_bridge_port, kobj)
 167
 168 static ssize_t brport_show(struct kobject * kobj,
 169                            struct attribute * attr, char * buf)
 170 {
 171         struct brport_attribute * brport_attr = to_brport_attr(attr);
 172         struct net_bridge_port * p = to_brport(kobj);
 173
 174         return brport_attr->show(p, buf);
 175 }
 176
 177 static ssize_t brport_store(struct kobject * kobj,
 178                             struct attribute * attr,
 179                             const char * buf, size_t count)
 180 {
 181         struct brport_attribute * brport_attr = to_brport_attr(attr);
 182         struct net_bridge_port * p = to_brport(kobj);
 183         ssize_t ret = -EINVAL;
 184         char *endp;
 185         unsigned long val;
 186
 187         if (!capable(CAP_NET_ADMIN))
 188                 return -EPERM;
 189
 190         val = simple_strtoul(buf, &endp, 0);
 191         if (endp != buf) {
 192                 if (!rtnl_trylock())
 193                         return restart_syscall();
 194                 if (p->dev && p->br && brport_attr->store) {
 195                         spin_lock_bh(&p->br->lock);
 196                         ret = brport_attr->store(p, val);
 197                         spin_unlock_bh(&p->br->lock);
 198                         if (ret == 0)
 199                                 ret = count;
 200                 }
 201                 rtnl_unlock();
 202         }
 203         return ret;
 204 }
 205
 206 struct sysfs_ops brport_sysfs_ops = {
 207         .show = brport_show,
 208         .store = brport_store,
 209 };
 210
 211 /*
 212  * Add sysfs entries to ethernet device added to a bridge.
 213  * Creates a brport subdirectory with bridge attributes.
 214  * Puts symlink in bridge's brport subdirectory
 215  */
 216 int br_sysfs_addif(struct net_bridge_port *p)
 217 {
 218         struct net_bridge *br = p->br;
 219         struct brport_attribute **a;
 220         int err;
 221
 222         err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
 223                                 SYSFS_BRIDGE_PORT_LINK);
 224         if (err)
 225                 goto out2;
 226
 227         for (a = brport_attrs; *a; ++a) {
 228                 err = sysfs_create_file(&p->kobj, &((*a)->attr));
 229                 if (err)
 230                         goto out2;
 231         }
 232
 233         err = sysfs_create_link(br->ifobj, &p->kobj, p->dev->name);
 234 out2:
 235         return err;
 236 }