163 строки
3.9 KiB
C
163 строки
3.9 KiB
C
/*
|
|
* net/l3mdev/l3mdev.c - L3 master device implementation
|
|
* Copyright (c) 2015 Cumulus Networks
|
|
* Copyright (c) 2015 David Ahern <dsa@cumulusnetworks.com>
|
|
*
|
|
* 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 <net/l3mdev.h>
|
|
|
|
/**
|
|
* l3mdev_master_ifindex - get index of L3 master device
|
|
* @dev: targeted interface
|
|
*/
|
|
|
|
int l3mdev_master_ifindex_rcu(const struct net_device *dev)
|
|
{
|
|
int ifindex = 0;
|
|
|
|
if (!dev)
|
|
return 0;
|
|
|
|
if (netif_is_l3_master(dev)) {
|
|
ifindex = dev->ifindex;
|
|
} else if (netif_is_l3_slave(dev)) {
|
|
struct net_device *master;
|
|
struct net_device *_dev = (struct net_device *)dev;
|
|
|
|
/* netdev_master_upper_dev_get_rcu calls
|
|
* list_first_or_null_rcu to walk the upper dev list.
|
|
* list_first_or_null_rcu does not handle a const arg. We aren't
|
|
* making changes, just want the master device from that list so
|
|
* typecast to remove the const
|
|
*/
|
|
master = netdev_master_upper_dev_get_rcu(_dev);
|
|
if (master)
|
|
ifindex = master->ifindex;
|
|
}
|
|
|
|
return ifindex;
|
|
}
|
|
EXPORT_SYMBOL_GPL(l3mdev_master_ifindex_rcu);
|
|
|
|
/**
|
|
* l3mdev_fib_table - get FIB table id associated with an L3
|
|
* master interface
|
|
* @dev: targeted interface
|
|
*/
|
|
|
|
u32 l3mdev_fib_table_rcu(const struct net_device *dev)
|
|
{
|
|
u32 tb_id = 0;
|
|
|
|
if (!dev)
|
|
return 0;
|
|
|
|
if (netif_is_l3_master(dev)) {
|
|
if (dev->l3mdev_ops->l3mdev_fib_table)
|
|
tb_id = dev->l3mdev_ops->l3mdev_fib_table(dev);
|
|
} else if (netif_is_l3_slave(dev)) {
|
|
/* Users of netdev_master_upper_dev_get_rcu need non-const,
|
|
* but current inet_*type functions take a const
|
|
*/
|
|
struct net_device *_dev = (struct net_device *) dev;
|
|
const struct net_device *master;
|
|
|
|
master = netdev_master_upper_dev_get_rcu(_dev);
|
|
if (master &&
|
|
master->l3mdev_ops->l3mdev_fib_table)
|
|
tb_id = master->l3mdev_ops->l3mdev_fib_table(master);
|
|
}
|
|
|
|
return tb_id;
|
|
}
|
|
EXPORT_SYMBOL_GPL(l3mdev_fib_table_rcu);
|
|
|
|
u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
|
|
{
|
|
struct net_device *dev;
|
|
u32 tb_id = 0;
|
|
|
|
if (!ifindex)
|
|
return 0;
|
|
|
|
rcu_read_lock();
|
|
|
|
dev = dev_get_by_index_rcu(net, ifindex);
|
|
if (dev)
|
|
tb_id = l3mdev_fib_table_rcu(dev);
|
|
|
|
rcu_read_unlock();
|
|
|
|
return tb_id;
|
|
}
|
|
EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);
|
|
|
|
/**
|
|
* l3mdev_get_rt6_dst - IPv6 route lookup based on flow. Returns
|
|
* cached route for L3 master device if relevant
|
|
* to flow
|
|
* @net: network namespace for device index lookup
|
|
* @fl6: IPv6 flow struct for lookup
|
|
*/
|
|
|
|
struct dst_entry *l3mdev_get_rt6_dst(struct net *net,
|
|
const struct flowi6 *fl6)
|
|
{
|
|
struct dst_entry *dst = NULL;
|
|
struct net_device *dev;
|
|
|
|
if (fl6->flowi6_oif) {
|
|
rcu_read_lock();
|
|
|
|
dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
|
|
if (dev && netif_is_l3_slave(dev))
|
|
dev = netdev_master_upper_dev_get_rcu(dev);
|
|
|
|
if (dev && netif_is_l3_master(dev) &&
|
|
dev->l3mdev_ops->l3mdev_get_rt6_dst)
|
|
dst = dev->l3mdev_ops->l3mdev_get_rt6_dst(dev, fl6);
|
|
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
return dst;
|
|
}
|
|
EXPORT_SYMBOL_GPL(l3mdev_get_rt6_dst);
|
|
|
|
/**
|
|
* l3mdev_get_saddr - get source address for a flow based on an interface
|
|
* enslaved to an L3 master device
|
|
* @net: network namespace for device index lookup
|
|
* @ifindex: Interface index
|
|
* @fl4: IPv4 flow struct
|
|
*/
|
|
|
|
int l3mdev_get_saddr(struct net *net, int ifindex, struct flowi4 *fl4)
|
|
{
|
|
struct net_device *dev;
|
|
int rc = 0;
|
|
|
|
if (ifindex) {
|
|
rcu_read_lock();
|
|
|
|
dev = dev_get_by_index_rcu(net, ifindex);
|
|
if (dev && netif_is_l3_slave(dev))
|
|
dev = netdev_master_upper_dev_get_rcu(dev);
|
|
|
|
if (dev && netif_is_l3_master(dev) &&
|
|
dev->l3mdev_ops->l3mdev_get_saddr)
|
|
rc = dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4);
|
|
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(l3mdev_get_saddr);
|