net: move address list functions to a separate file
+little renaming of unicast functions to be smooth with multicast ones
Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/dev_addr_lists.c b/net/core/dev_addr_lists.c
new file mode 100644
index 0000000..7e52b6d
--- /dev/null
+++ b/net/core/dev_addr_lists.c
@@ -0,0 +1,478 @@
+/*
+ * 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/list.h>
+
+/*
+ * General list handling functions
+ */
+
+static int __hw_addr_add(struct netdev_hw_addr_list *list, unsigned char *addr,
+ int addr_len, unsigned char addr_type)
+{
+ struct netdev_hw_addr *ha;
+ int alloc_size;
+
+ 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) {
+ ha->refcount++;
+ return 0;
+ }
+ }
+
+
+ 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->synced = false;
+ list_add_tail_rcu(&ha->list, &list->list);
+ list->count++;
+ return 0;
+}
+
+static void ha_rcu_free(struct rcu_head *head)
+{
+ struct netdev_hw_addr *ha;
+
+ ha = container_of(head, struct netdev_hw_addr, rcu_head);
+ kfree(ha);
+}
+
+static int __hw_addr_del(struct netdev_hw_addr_list *list, unsigned char *addr,
+ int addr_len, unsigned char addr_type)
+{
+ 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)) {
+ if (--ha->refcount)
+ return 0;
+ list_del_rcu(&ha->list);
+ call_rcu(&ha->rcu_head, ha_rcu_free);
+ list->count--;
+ return 0;
+ }
+ }
+ return -ENOENT;
+}
+
+static int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
+ struct netdev_hw_addr_list *from_list,
+ int addr_len,
+ unsigned char addr_type)
+{
+ int err;
+ struct netdev_hw_addr *ha, *ha2;
+ unsigned char type;
+
+ list_for_each_entry(ha, &from_list->list, list) {
+ type = addr_type ? addr_type : ha->type;
+ err = __hw_addr_add(to_list, ha->addr, addr_len, type);
+ if (err)
+ goto unroll;
+ }
+ return 0;
+
+unroll:
+ list_for_each_entry(ha2, &from_list->list, list) {
+ if (ha2 == ha)
+ break;
+ type = addr_type ? addr_type : ha2->type;
+ __hw_addr_del(to_list, ha2->addr, addr_len, type);
+ }
+ return err;
+}
+
+static void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
+ struct netdev_hw_addr_list *from_list,
+ int addr_len,
+ unsigned char addr_type)
+{
+ struct netdev_hw_addr *ha;
+ unsigned char type;
+
+ list_for_each_entry(ha, &from_list->list, list) {
+ type = addr_type ? addr_type : ha->type;
+ __hw_addr_del(to_list, ha->addr, addr_len, addr_type);
+ }
+}
+
+static 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->synced) {
+ err = __hw_addr_add(to_list, ha->addr,
+ addr_len, ha->type);
+ if (err)
+ break;
+ ha->synced = true;
+ ha->refcount++;
+ } else if (ha->refcount == 1) {
+ __hw_addr_del(to_list, ha->addr, addr_len, ha->type);
+ __hw_addr_del(from_list, ha->addr, addr_len, ha->type);
+ }
+ }
+ return err;
+}
+
+static 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->synced) {
+ __hw_addr_del(to_list, ha->addr,
+ addr_len, ha->type);
+ ha->synced = false;
+ __hw_addr_del(from_list, ha->addr,
+ addr_len, ha->type);
+ }
+ }
+}
+
+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);
+ call_rcu(&ha->rcu_head, ha_rcu_free);
+ }
+ list->count = 0;
+}
+
+static void __hw_addr_init(struct netdev_hw_addr_list *list)
+{
+ INIT_LIST_HEAD(&list->list);
+ list->count = 0;
+}
+
+/*
+ * 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, 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, 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 (ha->addr == dev->dev_addr && 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);
+
+/**
+ * dev_addr_add_multiple - Add device addresses from another device
+ * @to_dev: device to which addresses will be added
+ * @from_dev: device from which addresses will be added
+ * @addr_type: address type - 0 means type will be used from from_dev
+ *
+ * Add device addresses of the one device to another.
+ **
+ * The caller must hold the rtnl_mutex.
+ */
+int dev_addr_add_multiple(struct net_device *to_dev,
+ struct net_device *from_dev,
+ unsigned char addr_type)
+{
+ int err;
+
+ ASSERT_RTNL();
+
+ if (from_dev->addr_len != to_dev->addr_len)
+ return -EINVAL;
+ err = __hw_addr_add_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs,
+ to_dev->addr_len, addr_type);
+ if (!err)
+ call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev);
+ return err;
+}
+EXPORT_SYMBOL(dev_addr_add_multiple);
+
+/**
+ * dev_addr_del_multiple - Delete device addresses by another device
+ * @to_dev: device where the addresses will be deleted
+ * @from_dev: device by which addresses the addresses will be deleted
+ * @addr_type: address type - 0 means type will used from from_dev
+ *
+ * Deletes addresses in to device by the list of addresses in from device.
+ *
+ * The caller must hold the rtnl_mutex.
+ */
+int dev_addr_del_multiple(struct net_device *to_dev,
+ struct net_device *from_dev,
+ unsigned char addr_type)
+{
+ ASSERT_RTNL();
+
+ if (from_dev->addr_len != to_dev->addr_len)
+ return -EINVAL;
+ __hw_addr_del_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs,
+ to_dev->addr_len, addr_type);
+ call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev);
+ return 0;
+}
+EXPORT_SYMBOL(dev_addr_del_multiple);
+
+/*
+ * Unicast list handling functions
+ */
+
+/**
+ * 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, 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, 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_tx_lock_bh.
+ *
+ * This function is intended to be called from the dev->set_rx_mode
+ * function of layered software devices.
+ */
+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_bh(to);
+ err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len);
+ if (!err)
+ __dev_set_rx_mode(to);
+ netif_addr_unlock_bh(to);
+ return err;
+}
+EXPORT_SYMBOL(dev_uc_sync);
+
+/**
+ * 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(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
+ */
+
+/* To be filled here */
