diff options
Diffstat (limited to 'net/ipv4/devinet.c')
| -rw-r--r-- | net/ipv4/devinet.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c index 2fe5076..ee144a4 100644 --- a/net/ipv4/devinet.c +++ b/net/ipv4/devinet.c @@ -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); |
