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ipv6: add ipv6_dev_find()

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This is to add an ip_dev_find like function for ipv6, used to find
the dev by saddr.

It will be used by TIPC protocol. So also export it.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2020-08-03 23:34:46 +08:00 committed by David S. Miller
parent 5845589ed6
commit 81f6cb3122
2 changed files with 41 additions and 0 deletions
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2
include/net/addrconf.h
View File

@ -97,6 +97,8 @@ bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev);
struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr);
struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net,
const struct in6_addr *addr,
struct net_device *dev, int strict);

39
net/ipv6/addrconf.c
View File

@ -1983,6 +1983,45 @@ int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
}
EXPORT_SYMBOL(ipv6_chk_prefix);
/**
* ipv6_dev_find - find the first device with a given source address.
* @net: the net namespace
* @addr: the source address
*
* The caller should be protected by RCU, or RTNL.
*/
struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr)
{
unsigned int hash = inet6_addr_hash(net, addr);
struct inet6_ifaddr *ifp, *result = NULL;
struct net_device *dev = NULL;
rcu_read_lock();
hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
if (net_eq(dev_net(ifp->idev->dev), net) &&
ipv6_addr_equal(&ifp->addr, addr)) {
result = ifp;
break;
}
}
if (!result) {
struct rt6_info *rt;
rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
if (rt) {
dev = rt->dst.dev;
ip6_rt_put(rt);
}
} else {
dev = result->idev->dev;
}
rcu_read_unlock();
return dev;
}
EXPORT_SYMBOL(ipv6_dev_find);
struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
struct net_device *dev, int strict)
{