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authorXin Long <lucien.xin@gmail.com>2020-08-03 23:34:46 +0800
committerDavid S. Miller <davem@davemloft.net>2020-08-05 12:19:52 -0700
commit81f6cb31222d286dab65579d61f96664eeb99e0b (patch)
tree8f174a5e0f306a98759239c9aab941206c420ff2 /net
parent5845589ed652da9b65833044bd2d0bcb1d676ed0 (diff)
ipv6: add ipv6_dev_find()
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>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/addrconf.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 0acf6a9796ca..8e761b8c47c6 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -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)
{