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| author |   Xin Long <lucien.xin@gmail.com> | 2020-08-03 23:34:46 +0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2020-08-05 12:19:52 -0700 |
| commit | 81f6cb31222d286dab65579d61f96664eeb99e0b (patch) | |
| tree | 8f174a5e0f306a98759239c9aab941206c420ff2 /net | |
| parent | net: openvswitch: silence suspicious RCU usage warning (diff) | |
| download | linux-dev-81f6cb31222d286dab65579d61f96664eeb99e0b.tar.xz linux-dev-81f6cb31222d286dab65579d61f96664eeb99e0b.zip | |
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.c | 39 |
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) { |