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                  .owner = THIS_MODULE, },                       \
  34         .show   = _show,                                        \
  35         .store  = _store,                                       \
  36 };
  37
  38 static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
  39 {
  40         return sprintf(buf, "%d\n", p->path_cost);
  41 }
  42 static ssize_t store_path_cost(struct net_bridge_port *p, unsigned long v)
  43 {
  44         br_stp_set_path_cost(p, v);
  45         return 0;
  46 }
  47 static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
  48                    show_path_cost, store_path_cost);
  49
  50 static ssize_t show_priority(struct net_bridge_port *p, char *buf)
  51 {
  52         return sprintf(buf, "%d\n", p->priority);
  53 }
  54 static ssize_t store_priority(struct net_bridge_port *p, unsigned long v)
  55 {
  56         if (v >= (1<<(16-BR_PORT_BITS)))
  57                 return -ERANGE;
  58         br_stp_set_port_priority(p, v);
  59         return 0;
  60 }
  61 static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
  62                          show_priority, store_priority);
  63
  64 static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
  65 {
  66         return br_show_bridge_id(buf, &p->designated_root);
  67 }
  68 static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
  69
  70 static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
  71 {
  72         return br_show_bridge_id(buf, &p->designated_bridge);
  73 }
  74 static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
  75
  76 static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
  77 {
  78         return sprintf(buf, "%d\n", p->designated_port);
  79 }
  80 static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
  81
  82 static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
  83 {
  84         return sprintf(buf, "%d\n", p->designated_cost);
  85 }
  86 static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
  87
  88 static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
  89 {
  90         return sprintf(buf, "0x%x\n", p->port_id);
  91 }
  92 static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
  93
  94 static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
  95 {
  96         return sprintf(buf, "0x%x\n", p->port_no);
  97 }
  98
  99 static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
 100
 101 static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
 102 {
 103         return sprintf(buf, "%d\n", p->topology_change_ack);
 104 }
 105 static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
 106
 107 static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
 108 {
 109         return sprintf(buf, "%d\n", p->config_pending);
 110 }
 111 static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
 112
 113 static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
 114 {
 115         return sprintf(buf, "%d\n", p->state);
 116 }
 117 static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
 118
 119 static ssize_t show_message_age_timer(struct net_bridge_port *p,
 120                                             char *buf)
 121 {
 122         return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
 123 }
 124 static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
 125
 126 static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
 127                                             char *buf)
 128 {
 129         return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
 130 }
 131 static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
 132
 133 static ssize_t show_hold_timer(struct net_bridge_port *p,
 134                                             char *buf)
 135 {
 136         return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
 137 }
 138 static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
 139
 140 static ssize_t store_flush(struct net_bridge_port *p, unsigned long v)
 141 {
 142         br_fdb_delete_by_port(p->br, p, 0); // Don't delete local entry
 143         return 0;
 144 }
 145 static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
 146
 147 static struct brport_attribute *brport_attrs[] = {
 148         &brport_attr_path_cost,
 149         &brport_attr_priority,
 150         &brport_attr_port_id,
 151         &brport_attr_port_no,
 152         &brport_attr_designated_root,
 153         &brport_attr_designated_bridge,
 154         &brport_attr_designated_port,
 155         &brport_attr_designated_cost,
 156         &brport_attr_state,
 157         &brport_attr_change_ack,
 158         &brport_attr_config_pending,
 159         &brport_attr_message_age_timer,
 160         &brport_attr_forward_delay_timer,
 161         &brport_attr_hold_timer,
 162         &brport_attr_flush,
 163         NULL
 164 };
 165
 166 #define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
 167 #define to_brport(obj)  container_of(obj, struct net_bridge_port, kobj)
 168
 169 static ssize_t brport_show(struct kobject * kobj,
 170                            struct attribute * attr, char * buf)
 171 {
 172         struct brport_attribute * brport_attr = to_brport_attr(attr);
 173         struct net_bridge_port * p = to_brport(kobj);
 174
 175         return brport_attr->show(p, buf);
 176 }
 177
 178 static ssize_t brport_store(struct kobject * kobj,
 179                             struct attribute * attr,
 180                             const char * buf, size_t count)
 181 {
 182         struct brport_attribute * brport_attr = to_brport_attr(attr);
 183         struct net_bridge_port * p = to_brport(kobj);
 184         ssize_t ret = -EINVAL;
 185         char *endp;
 186         unsigned long val;
 187
 188         if (!capable(CAP_NET_ADMIN))
 189                 return -EPERM;
 190
 191         val = simple_strtoul(buf, &endp, 0);
 192         if (endp != buf) {
 193                 rtnl_lock();
 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 }