- 根目录:
- net
- core
- dev_addr_lists.c
/*
* net/core/dev_addr_lists.c - Functions for handling net device lists
* Copyright (c) 2010 Jiri Pirko <jpirko@redhat.com>
*
* This file contains functions for working with unicast, multicast and device
* addresses lists.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/export.h>
#include <linux/list.h>
/*
* General list handling functions
*/
static int __hw_addr_create_ex(struct netdev_hw_addr_list *list,
const unsigned char *addr, int addr_len,
unsigned char addr_type, bool global,
bool sync)
{
struct netdev_hw_addr *ha;
int alloc_size;
alloc_size = sizeof(*ha);
if (alloc_size < L1_CACHE_BYTES)
alloc_size = L1_CACHE_BYTES;
ha = kmalloc(alloc_size, GFP_ATOMIC);
if (!ha)
return -ENOMEM;
memcpy(ha->addr, addr, addr_len);
ha->type = addr_type;
ha->refcount = 1;
ha->global_use = global;
ha->synced = sync ? 1 : 0;
ha->sync_cnt = 0;
list_add_tail_rcu(&ha->list, &list->list);
list->count++;
return 0;
}
static int __hw_addr_add_ex(struct netdev_hw_addr_list *list,
const unsigned char *addr, int addr_len,
unsigned char addr_type, bool global, bool sync,
int sync_count)
{
struct netdev_hw_addr *ha;
if (addr_len > MAX_ADDR_LEN)
return -EINVAL;
list_for_each_entry(ha, &list->list, list) {
if (!memcmp(ha->addr, addr, addr_len) &&
ha->type == addr_type) {
if (global) {
/* check if addr is already used as global */
if (ha->global_use)
return 0;
else
ha->global_use = true;
}
if (sync) {
if (ha->synced && sync_count)
return -EEXIST;
else
ha->synced++;
}
ha->refcount++;
return 0;
}
}
return __hw_addr_create_ex(list, addr, addr_len, addr_type, global,
sync);
}
static int __hw_addr_add(struct netdev_hw_addr_list *list,
const unsigned char *addr, int addr_len,
unsigned char addr_type)
{
return __hw_addr_add_ex(list, addr, addr_len, addr_type, false, false,
0);
}
static int __hw_addr_del_entry(struct netdev_hw_addr_list *list,
struct netdev_hw_addr *ha, bool global,
bool sync)
{
if (global && !ha->global_use)
return -ENOENT;
if (sync && !ha->synced)
return -ENOENT;
if (global)
ha->global_use = false;
if (sync)
ha->synced--;
if (--ha->refcount)
return 0;
list_del_rcu(&ha->list);
kfree_rcu(ha, rcu_head);
list->count--;
return 0;
}
static int __hw_addr_del_ex(struct netdev_hw_addr_list *list,
const unsigned char *addr, int addr_len,
unsigned char addr_type, bool global, bool sync)
{
struct netdev_hw_addr *ha;
list_for_each_entry(ha, &list->list, list) {
if (!memcmp(ha->addr, addr, addr_len) &&
(ha->type == addr_type || !addr_type))
return __hw_addr_del_entry(list, ha, global, sync);
}
return -ENOENT;
}
static int __hw_addr_del(struct netdev_hw_addr_list *list,
const unsigned char *addr, int addr_len,
unsigned char addr_type)
{
return __hw_addr_del_ex(list, addr, addr_len, addr_type, false, false);
}
static int __hw_addr_sync_one(struct netdev_hw_addr_list *to_list,
struct netdev_hw_addr *ha,
int addr_len)
{
int err;
err = __hw_addr_add_ex(to_list, ha->addr, addr_len, ha->type,
false, true, ha->sync_cnt);
if (err && err != -EEXIST)
return err;
if (!err) {
ha->sync_cnt++;
ha->refcount++;
}
return 0;
}
static void __hw_addr_unsync_one(struct netdev_hw_addr_list *to_list,
struct netdev_hw_addr_list *from_list,
struct netdev_hw_addr *ha,
int addr_len)
{
int err;
err = __hw_addr_del_ex(to_list, ha->addr, addr_len, ha->type,
false, true);
if (err)
return;
ha->sync_cnt--;
/* address on from list is not marked synced */
__hw_addr_del_entry(from_list, ha, false, false);
}
static int __hw_addr_sync_multiple(struct netdev_hw_addr_list *to_list,
struct netdev_hw_addr_list *from_list,
int addr_len)
{
int err = 0;
struct netdev_hw_addr *ha, *tmp;
list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
if (ha->sync_cnt == ha->refcount) {
__hw_addr_unsync_one(to_list, from_list, ha, addr_len);
} else {
err = __hw_addr_sync_one(to_list, ha, addr_len);
if (err)
break;
}
}
return err;
}
/* This function only works where there is a strict 1-1 relationship
* between source and destionation of they synch. If you ever need to
* sync addresses to more then 1 destination, you need to use
* __hw_addr_sync_multiple().
*/
int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
struct netdev_hw_addr_list *from_list,
int addr_len)
{
int err = 0;
struct netdev_hw_addr *ha, *tmp;
list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
if (!ha->sync_cnt) {
err = __hw_addr_sync_one(to_list, ha, addr_len);
if (err)
break;
} else if (ha->refcount == 1)
__hw_addr_unsync_one(to_list, from_list, ha, addr_len);
}
return err;
}
EXPORT_SYMBOL(__hw_addr_sync);
void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
struct netdev_hw_addr_list *from_list,
int addr_len)
{
struct netdev_hw_addr *ha, *tmp;
list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
if (ha->sync_cnt)
__hw_addr_unsync_one(to_list, from_list, ha, addr_len);
}
}
EXPORT_SYMBOL(__hw_addr_unsync);
static void __hw_addr_flush(struct netdev_hw_addr_list *list)
{
struct netdev_hw_addr *ha, *tmp;
list_for_each_entry_safe(ha, tmp, &list->list, list) {
list_del_rcu(&ha->list);
kfree_rcu(ha, rcu_head);
}
list->count = 0;
}
void __hw_addr_init(struct netdev_hw_addr_list *list)
{
INIT_LIST_HEAD(&list->list);
list->count = 0;
}
EXPORT_SYMBOL(__hw_addr_init);
/*
* Device addresses handling functions
*/
/**
* dev_addr_flush - Flush device address list
* @dev: device
*
* Flush device address list and reset ->dev_addr.
*
* The caller must hold the rtnl_mutex.
*/
void dev_addr_flush(struct net_device *dev)
{
/* rtnl_mutex must be held here */
__hw_addr_flush(&dev->dev_addrs);
dev->dev_addr = NULL;
}
EXPORT_SYMBOL(dev_addr_flush);
/**
* dev_addr_init - Init device address list
* @dev: device
*
* Init device address list and create the first element,
* used by ->dev_addr.
*
* The caller must hold the rtnl_mutex.
*/
int dev_addr_init(struct net_device *dev)
{
unsigned char addr[MAX_ADDR_LEN];
struct netdev_hw_addr *ha;
int err;
/* rtnl_mutex must be held here */
__hw_addr_init(&dev->dev_addrs);
memset(addr, 0, sizeof(addr));
err = __hw_addr_add(&dev->dev_addrs, addr, sizeof(addr),
NETDEV_HW_ADDR_T_LAN);
if (!err) {
/*
* Get the first (previously created) address from the list
* and set dev_addr pointer to this location.
*/
ha = list_first_entry(&dev->dev_addrs.list,
struct netdev_hw_addr, list);
dev->dev_addr = ha->addr;
}
return err;
}
EXPORT_SYMBOL(dev_addr_init);
/**
* dev_addr_add - Add a device address
* @dev: device
* @addr: address to add
* @addr_type: address type
*
* Add a device address to the device or increase the reference count if
* it already exists.
*
* The caller must hold the rtnl_mutex.
*/
int dev_addr_add(struct net_device *dev, const unsigned char *addr,
unsigned char addr_type)
{
int err;
ASSERT_RTNL();
err = __hw_addr_add(&dev->dev_addrs, addr, dev->addr_len, addr_type);
if (!err)
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
return err;
}
EXPORT_SYMBOL(dev_addr_add);
/**
* dev_addr_del - Release a device address.
* @dev: device
* @addr: address to delete
* @addr_type: address type
*
* Release reference to a device address and remove it from the device
* if the reference count drops to zero.
*
* The caller must hold the rtnl_mutex.
*/
int dev_addr_del(struct net_device *dev, const unsigned char *addr,
unsigned char addr_type)
{
int err;
struct netdev_hw_addr *ha;
ASSERT_RTNL();
/*
* We can not remove the first address from the list because
* dev->dev_addr points to that.
*/
ha = list_first_entry(&dev->dev_addrs.list,
struct netdev_hw_addr, list);
if (!memcmp(ha->addr, addr, dev->addr_len) &&
ha->type == addr_type && ha->refcount == 1)
return -ENOENT;
err = __hw_addr_del(&dev->dev_addrs, addr, dev->addr_len,
addr_type);
if (!err)
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
return err;
}
EXPORT_SYMBOL(dev_addr_del);
/*
* Unicast list handling functions
*/
/**
* dev_uc_add_excl - Add a global secondary unicast address
* @dev: device
* @addr: address to add
*/
int dev_uc_add_excl(struct net_device *dev, const unsigned char *addr)
{
struct netdev_hw_addr *ha;
int err;
netif_addr_lock_bh(dev);
list_for_each_entry(ha, &dev->uc.list, list) {
if (!memcmp(ha->addr, addr, dev->addr_len) &&
ha->type == NETDEV_HW_ADDR_T_UNICAST) {
err = -EEXIST;
goto out;
}
}
err = __hw_addr_create_ex(&dev->uc, addr, dev->addr_len,
NETDEV_HW_ADDR_T_UNICAST, true, false);
if (!err)
__dev_set_rx_mode(dev);
out:
netif_addr_unlock_bh(dev);
return err;
}
EXPORT_SYMBOL(dev_uc_add_excl);
/**
* dev_uc_add - Add a secondary unicast address
* @dev: device
* @addr: address to add
*
* Add a secondary unicast address to the device or increase
* the reference count if it already exists.
*/
int dev_uc_add(struct net_device *dev, const unsigned char *addr)
{
int err;
netif_addr_lock_bh(dev);
err = __hw_addr_add(&dev->uc, addr, dev->addr_len,
NETDEV_HW_ADDR_T_UNICAST);
if (!err)
__dev_set_rx_mode(dev);
netif_addr_unlock_bh(dev);
return err;
}
EXPORT_SYMBOL(dev_uc_add);
/**
* dev_uc_del - Release secondary unicast address.
* @dev: device
* @addr: address to delete
*
* Release reference to a secondary unicast address and remove it
* from the device if the reference count drops to zero.
*/
int dev_uc_del(struct net_device *dev, const unsigned char *addr)
{
int err;
netif_addr_lock_bh(dev);
err = __hw_addr_del(&dev->uc, addr, dev->addr_len,
NETDEV_HW_ADDR_T_UNICAST);
if (!err)
__dev_set_rx_mode(dev);
netif_addr_unlock_bh(dev);
return err;
}
EXPORT_SYMBOL(dev_uc_del);
/**
* dev_uc_sync - Synchronize device's unicast list to another device
* @to: destination device
* @from: source device
*
* Add newly added addresses to the destination device and release
* addresses that have no users left. The source device must be
* locked by netif_addr_lock_bh.
*
* This function is intended to be called from the dev->set_rx_mode
* function of layered software devices. This function assumes that
* addresses will only ever be synced to the @to devices and no other.
*/
int dev_uc_sync(struct net_device *to, struct net_device *from)
{
int err = 0;
if (to->addr_len != from->addr_len)
return -EINVAL;
netif_addr_lock_nested(to);
err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len);
if (!err)
__dev_set_rx_mode(to);
netif_addr_unlock(to);
return err;
}
EXPORT_SYMBOL(dev_uc_sync);
/**
* dev_uc_sync_multiple - Synchronize device's unicast list to another
* device, but allow for multiple calls to sync to multiple devices.
* @to: destination device
* @from: source device
*
* Add newly added addresses to the destination device and release
* addresses that have been deleted from the source. The source device
* must be locked by netif_addr_lock_bh.
*
* This function is intended to be called from the dev->set_rx_mode
* function of layered software devices. It allows for a single source
* device to be synced to multiple destination devices.
*/
int dev_uc_sync_multiple(struct net_device *to, struct net_device *from)
{
int err = 0;
if (to->addr_len != from->addr_len)
return -EINVAL;
netif_addr_lock_nested(to);
err = __hw_addr_sync_multiple(&to->uc, &from->uc, to->addr_len);
if (!err)
__dev_set_rx_mode(to);
netif_addr_unlock(to);
return err;
}
EXPORT_SYMBOL(dev_uc_sync_multiple);
/**
* dev_uc_unsync - Remove synchronized addresses from the destination device
* @to: destination device
* @from: source device
*
* Remove all addresses that were added to the destination device by
* dev_uc_sync(). This function is intended to be called from the
* dev->stop function of layered software devices.
*/
void dev_uc_unsync(struct net_device *to, struct net_device *from)
{
if (to->addr_len != from->addr_len)
return;
netif_addr_lock_bh(from);
netif_addr_lock_nested(to);
__hw_addr_unsync(&to->uc, &from->uc, to->addr_len);
__dev_set_rx_mode(to);
netif_addr_unlock(to);
netif_addr_unlock_bh(from);
}
EXPORT_SYMBOL(dev_uc_unsync);
/**
* dev_uc_flush - Flush unicast addresses
* @dev: device
*
* Flush unicast addresses.
*/
void dev_uc_flush(struct net_device *dev)
{
netif_addr_lock_bh(dev);
__hw_addr_flush(&dev->uc);
netif_addr_unlock_bh(dev);
}
EXPORT_SYMBOL(dev_uc_flush);
/**
* dev_uc_flush - Init unicast address list
* @dev: device
*
* Init unicast address list.
*/
void dev_uc_init(struct net_device *dev)
{
__hw_addr_init(&dev->uc);
}
EXPORT_SYMBOL(dev_uc_init);
/*
* Multicast list handling functions
*/
/**
* dev_mc_add_excl - Add a global secondary multicast address
* @dev: device
* @addr: address to add
*/
int dev_mc_add_excl(struct net_device *dev, const unsigned char *addr)
{
struct netdev_hw_addr *ha;
int err;
netif_addr_lock_bh(dev);
list_for_each_entry(ha, &dev->mc.list, list) {
if (!memcmp(ha->addr, addr, dev->addr_len) &&
ha->type == NETDEV_HW_ADDR_T_MULTICAST) {
err = -EEXIST;
goto out;
}
}
err = __hw_addr_create_ex(&dev->mc, addr, dev->addr_len,
NETDEV_HW_ADDR_T_MULTICAST, true, false);
if (!err)
__dev_set_rx_mode(dev);
out:
netif_addr_unlock_bh(dev);
return err;
}
EXPORT_SYMBOL(dev_mc_add_excl);
static int __dev_mc_add(struct net_device *dev, const unsigned char *addr,
bool global)
{
int err;
netif_addr_lock_bh(dev);
err = __hw_addr_add_ex(&dev->mc, addr, dev->addr_len,
NETDEV_HW_ADDR_T_MULTICAST, global, false, 0);
if (!err)
__dev_set_rx_mode(dev);
netif_addr_unlock_bh(dev);
return err;
}
/**
* dev_mc_add - Add a multicast address
* @dev: device
* @addr: address to add
*
* Add a multicast address to the device or increase
* the reference count if it already exists.
*/
int dev_mc_add(struct net_device *dev, const unsigned char *addr)
{
return __dev_mc_add(dev, addr, false);
}
EXPORT_SYMBOL(dev_mc_add);
/**
* dev_mc_add_global - Add a global multicast address
* @dev: device
* @addr: address to add
*
* Add a global multicast address to the device.
*/
int dev_mc_add_global(struct net_device *dev, const unsigned char *addr)
{
return __dev_mc_add(dev, addr, true);
}
EXPORT_SYMBOL(dev_mc_add_global);
static int __dev_mc_del(struct net_device *dev, const unsigned char *addr,
bool global)
{
int err;
netif_addr_lock_bh(dev);
err = __hw_addr_del_ex(&dev->mc, addr, dev->addr_len,
NETDEV_HW_ADDR_T_MULTICAST, global, false);
if (!err)
__dev_set_rx_mode(dev);
netif_addr_unlock_bh(dev);
return err;
}
/**
* dev_mc_del - Delete a multicast address.
* @dev: device
* @addr: address to delete
*
* Release reference to a multicast address and remove it
* from the device if the reference count drops to zero.
*/
int dev_mc_del(struct net_device *dev, const unsigned char *addr)
{
return __dev_mc_del(dev, addr, false);
}
EXPORT_SYMBOL(dev_mc_del);
/**
* dev_mc_del_global - Delete a global multicast address.
* @dev: device
* @addr: address to delete
*
* Release reference to a multicast address and remove it
* from the device if the reference count drops to zero.
*/
int dev_mc_del_global(struct net_device *dev, const unsigned char *addr)
{
return __dev_mc_del(dev, addr, true);
}
EXPORT_SYMBOL(dev_mc_del_global);
/**
* dev_mc_sync - Synchronize device's multicast list to another device
* @to: destination device
* @from: source device
*
* Add newly added addresses to the destination device and release
* addresses that have no users left. The source device must be
* locked by netif_addr_lock_bh.
*
* This function is intended to be called from the ndo_set_rx_mode
* function of layered software devices.
*/
int dev_mc_sync(struct net_device *to, struct net_device *from)
{
int err = 0;
if (to->addr_len != from->addr_len)
return -EINVAL;
netif_addr_lock_nested(to);
err = __hw_addr_sync(&to->mc, &from->mc, to->addr_len);
if (!err)
__dev_set_rx_mode(to);
netif_addr_unlock(to);
return err;
}
EXPORT_SYMBOL(dev_mc_sync);
/**
* dev_mc_sync_multiple - Synchronize device's multicast list to another
* device, but allow for multiple calls to sync to multiple devices.
* @to: destination device
* @from: source device
*
* Add newly added addresses to the destination device and release
* addresses that have no users left. The source device must be
* locked by netif_addr_lock_bh.
*
* This function is intended to be called from the ndo_set_rx_mode
* function of layered software devices. It allows for a single
* source device to be synced to multiple destination devices.
*/
int dev_mc_sync_multiple(struct net_device *to, struct net_device *from)
{
int err = 0;
if (to->addr_len != from->addr_len)
return -EINVAL;
netif_addr_lock_nested(to);
err = __hw_addr_sync_multiple(&to->mc, &from->mc, to->addr_len);
if (!err)
__dev_set_rx_mode(to);
netif_addr_unlock(to);
return err;
}
EXPORT_SYMBOL(dev_mc_sync_multiple);
/**
* dev_mc_unsync - Remove synchronized addresses from the destination device
* @to: destination device
* @from: source device
*
* Remove all addresses that were added to the destination device by
* dev_mc_sync(). This function is intended to be called from the
* dev->stop function of layered software devices.
*/
void dev_mc_unsync(struct net_device *to, struct net_device *from)
{
if (to->addr_len != from->addr_len)
return;
netif_addr_lock_bh(from);
netif_addr_lock_nested(to);
__hw_addr_unsync(&to->mc, &from->mc, to->addr_len);
__dev_set_rx_mode(to);
netif_addr_unlock(to);
netif_addr_unlock_bh(from);
}
EXPORT_SYMBOL(dev_mc_unsync);
/**
* dev_mc_flush - Flush multicast addresses
* @dev: device
*
* Flush multicast addresses.
*/
void dev_mc_flush(struct net_device *dev)
{
netif_addr_lock_bh(dev);
__hw_addr_flush(&dev->mc);
netif_addr_unlock_bh(dev);
}
EXPORT_SYMBOL(dev_mc_flush);
/**
* dev_mc_flush - Init multicast address list
* @dev: device
*
* Init multicast address list.
*/
void dev_mc_init(struct net_device *dev)
{
__hw_addr_init(&dev->mc);
}
EXPORT_SYMBOL(dev_mc_init);