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
  23struct 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)                   \
  30const struct brport_attribute brport_attr_##_name = {           \
  31        .attr = {.name = __stringify(_name),                    \
  32                 .mode = _mode },                               \
  33        .show   = _show,                                        \
  34        .store  = _store,                                       \
  35};
  36
  37static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
  38{
  39        return sprintf(buf, "%d\n", p->path_cost);
  40}
  41
  42static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR,
  43                   show_path_cost, br_stp_set_path_cost);
  44
  45static ssize_t show_priority(struct net_bridge_port *p, char *buf)
  46{
  47        return sprintf(buf, "%d\n", p->priority);
  48}
  49
  50static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR,
  51                         show_priority, br_stp_set_port_priority);
  52
  53static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
  54{
  55        return br_show_bridge_id(buf, &p->designated_root);
  56}
  57static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
  58
  59static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
  60{
  61        return br_show_bridge_id(buf, &p->designated_bridge);
  62}
  63static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
  64
  65static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
  66{
  67        return sprintf(buf, "%d\n", p->designated_port);
  68}
  69static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
  70
  71static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
  72{
  73        return sprintf(buf, "%d\n", p->designated_cost);
  74}
  75static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
  76
  77static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
  78{
  79        return sprintf(buf, "0x%x\n", p->port_id);
  80}
  81static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
  82
  83static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
  84{
  85        return sprintf(buf, "0x%x\n", p->port_no);
  86}
  87
  88static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
  89
  90static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
  91{
  92        return sprintf(buf, "%d\n", p->topology_change_ack);
  93}
  94static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
  95
  96static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
  97{
  98        return sprintf(buf, "%d\n", p->config_pending);
  99}
 100static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
 101
 102static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
 103{
 104        return sprintf(buf, "%d\n", p->state);
 105}
 106static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
 107
 108static ssize_t show_message_age_timer(struct net_bridge_port *p,
 109                                            char *buf)
 110{
 111        return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
 112}
 113static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
 114
 115static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
 116                                            char *buf)
 117{
 118        return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
 119}
 120static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
 121
 122static ssize_t show_hold_timer(struct net_bridge_port *p,
 123                                            char *buf)
 124{
 125        return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
 126}
 127static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
 128
 129static int store_flush(struct net_bridge_port *p, unsigned long v)
 130{
 131        br_fdb_delete_by_port(p->br, p, 0); // Don't delete local entry
 132        return 0;
 133}
 134static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
 135
 136static ssize_t show_hairpin_mode(struct net_bridge_port *p, char *buf)
 137{
 138        int hairpin_mode = (p->flags & BR_HAIRPIN_MODE) ? 1 : 0;
 139        return sprintf(buf, "%d\n", hairpin_mode);
 140}
 141static int store_hairpin_mode(struct net_bridge_port *p, unsigned long v)
 142{
 143        if (v)
 144                p->flags |= BR_HAIRPIN_MODE;
 145        else
 146                p->flags &= ~BR_HAIRPIN_MODE;
 147        return 0;
 148}
 149static BRPORT_ATTR(hairpin_mode, S_IRUGO | S_IWUSR,
 150                   show_hairpin_mode, store_hairpin_mode);
 151
 152#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 153static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
 154{
 155        return sprintf(buf, "%d\n", p->multicast_router);
 156}
 157
 158static int store_multicast_router(struct net_bridge_port *p,
 159                                      unsigned long v)
 160{
 161        return br_multicast_set_port_router(p, v);
 162}
 163static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router,
 164                   store_multicast_router);
 165#endif
 166
 167static const struct brport_attribute *brport_attrs[] = {
 168        &brport_attr_path_cost,
 169        &brport_attr_priority,
 170        &brport_attr_port_id,
 171        &brport_attr_port_no,
 172        &brport_attr_designated_root,
 173        &brport_attr_designated_bridge,
 174        &brport_attr_designated_port,
 175        &brport_attr_designated_cost,
 176        &brport_attr_state,
 177        &brport_attr_change_ack,
 178        &brport_attr_config_pending,
 179        &brport_attr_message_age_timer,
 180        &brport_attr_forward_delay_timer,
 181        &brport_attr_hold_timer,
 182        &brport_attr_flush,
 183        &brport_attr_hairpin_mode,
 184#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 185        &brport_attr_multicast_router,
 186#endif
 187        NULL
 188};
 189
 190#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
 191#define to_brport(obj)  container_of(obj, struct net_bridge_port, kobj)
 192
 193static ssize_t brport_show(struct kobject * kobj,
 194                           struct attribute * attr, char * buf)
 195{
 196        struct brport_attribute * brport_attr = to_brport_attr(attr);
 197        struct net_bridge_port * p = to_brport(kobj);
 198
 199        return brport_attr->show(p, buf);
 200}
 201
 202static ssize_t brport_store(struct kobject * kobj,
 203                            struct attribute * attr,
 204                            const char * buf, size_t count)
 205{
 206        struct brport_attribute * brport_attr = to_brport_attr(attr);
 207        struct net_bridge_port * p = to_brport(kobj);
 208        ssize_t ret = -EINVAL;
 209        char *endp;
 210        unsigned long val;
 211
 212        if (!capable(CAP_NET_ADMIN))
 213                return -EPERM;
 214
 215        val = simple_strtoul(buf, &endp, 0);
 216        if (endp != buf) {
 217                if (!rtnl_trylock())
 218                        return restart_syscall();
 219                if (p->dev && p->br && brport_attr->store) {
 220                        spin_lock_bh(&p->br->lock);
 221                        ret = brport_attr->store(p, val);
 222                        spin_unlock_bh(&p->br->lock);
 223                        if (ret == 0)
 224                                ret = count;
 225                }
 226                rtnl_unlock();
 227        }
 228        return ret;
 229}
 230
 231const struct sysfs_ops brport_sysfs_ops = {
 232        .show = brport_show,
 233        .store = brport_store,
 234};
 235
 236/*
 237 * Add sysfs entries to ethernet device added to a bridge.
 238 * Creates a brport subdirectory with bridge attributes.
 239 * Puts symlink in bridge's brif subdirectory
 240 */
 241int br_sysfs_addif(struct net_bridge_port *p)
 242{
 243        struct net_bridge *br = p->br;
 244        const struct brport_attribute **a;
 245        int err;
 246
 247        err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
 248                                SYSFS_BRIDGE_PORT_LINK);
 249        if (err)
 250                return err;
 251
 252        for (a = brport_attrs; *a; ++a) {
 253                err = sysfs_create_file(&p->kobj, &((*a)->attr));
 254                if (err)
 255                        return err;
 256        }
 257
 258        strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
 259        return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
 260}
 261
 262/* Rename bridge's brif symlink */
 263int br_sysfs_renameif(struct net_bridge_port *p)
 264{
 265        struct net_bridge *br = p->br;
 266        int err;
 267
 268        /* If a rename fails, the rollback will cause another
 269         * rename call with the existing name.
 270         */
 271        if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ))
 272                return 0;
 273
 274        err = sysfs_rename_link(br->ifobj, &p->kobj,
 275                                p->sysfs_name, p->dev->name);
 276        if (err)
 277                netdev_notice(br->dev, "unable to rename link %s to %s",
 278                              p->sysfs_name, p->dev->name);
 279        else
 280                strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
 281
 282        return err;
 283}
 284
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