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ipv4: Implement __ip_dev_find using new interface address hash.

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Much quicker than going through the FIB tables.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2011-02-18 12:43:09 -08:00
parent fd23c3b311
commit 9435eb1cf0
2 changed files with 33 additions and 40 deletions
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33
net/ipv4/devinet.c
View File

@ -125,6 +125,39 @@ static void inet_hash_remove(struct in_ifaddr *ifa)
spin_unlock(&inet_addr_hash_lock);
}
/**
* __ip_dev_find - find the first device with a given source address.
* @net: the net namespace
* @addr: the source address
* @devref: if true, take a reference on the found device
*
* If a caller uses devref=false, it should be protected by RCU, or RTNL
*/
struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
{
unsigned int hash = inet_addr_hash(net, addr);
struct net_device *result = NULL;
struct in_ifaddr *ifa;
struct hlist_node *node;
rcu_read_lock();
hlist_for_each_entry_rcu(ifa, node, &inet_addr_lst[hash], hash) {
struct net_device *dev = ifa->ifa_dev->dev;
if (!net_eq(dev_net(dev), net))
continue;
if (ifa->ifa_address == addr) {
result = dev;
break;
}
}
if (result && devref)
dev_hold(result);
rcu_read_unlock();
return result;
}
EXPORT_SYMBOL(__ip_dev_find);
static void rtmsg_ifa(int event, struct in_ifaddr *, struct nlmsghdr *, u32);
static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);

40
net/ipv4/fib_frontend.c
View File

@ -132,46 +132,6 @@ static void fib_flush(struct net *net)
rt_cache_flush(net, -1);
}
/**
* __ip_dev_find - find the first device with a given source address.
* @net: the net namespace
* @addr: the source address
* @devref: if true, take a reference on the found device
*
* If a caller uses devref=false, it should be protected by RCU, or RTNL
*/
struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
{
struct flowi fl = {
.fl4_dst = addr,
};
struct fib_result res = { 0 };
struct net_device *dev = NULL;
struct fib_table *local_table;
#ifdef CONFIG_IP_MULTIPLE_TABLES
res.r = NULL;
#endif
rcu_read_lock();
local_table = fib_get_table(net, RT_TABLE_LOCAL);
if (!local_table ||
fib_table_lookup(local_table, &fl, &res, FIB_LOOKUP_NOREF)) {
rcu_read_unlock();
return NULL;
}
if (res.type != RTN_LOCAL)
goto out;
dev = FIB_RES_DEV(res);
if (dev && devref)
dev_hold(dev);
out:
rcu_read_unlock();
return dev;
}
EXPORT_SYMBOL(__ip_dev_find);
/*
* Find address type as if only "dev" was present in the system. If
* on_dev is NULL then all interfaces are taken into consideration.