On 8/5/20 5:03 AM, Ying Xue wrote:
>> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
>> index 840bfdb..857d6f9 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);
why is this needed? you have already walked the interfaces in the
namespace and not found the address. Doing a route lookup is beyond the
stated scope of this function.
>> + 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)
>> {
>>
