ipv6: addrconf: factorize inet6_addr_hash() call
ipv6_add_addr_hash() can compute the hash value outside of locked section and pass it to ipv6_chk_same_addr(). Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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parent
56fc709b7a
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752a92927e
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@ -956,9 +956,8 @@ static u32 inet6_addr_hash(const struct in6_addr *addr)
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}
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}
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static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
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static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
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struct net_device *dev)
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struct net_device *dev, unsigned int hash)
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{
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{
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unsigned int hash = inet6_addr_hash(addr);
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struct inet6_ifaddr *ifp;
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struct inet6_ifaddr *ifp;
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hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
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hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
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@ -974,23 +973,19 @@ static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
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static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
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static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
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{
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{
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unsigned int hash;
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unsigned int hash = inet6_addr_hash(&ifa->addr);
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int err = 0;
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int err = 0;
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spin_lock(&addrconf_hash_lock);
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spin_lock(&addrconf_hash_lock);
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/* Ignore adding duplicate addresses on an interface */
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/* Ignore adding duplicate addresses on an interface */
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if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev)) {
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if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
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ADBG("ipv6_add_addr: already assigned\n");
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ADBG("ipv6_add_addr: already assigned\n");
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err = -EEXIST;
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err = -EEXIST;
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goto out;
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} else {
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hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
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}
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}
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/* Add to big hash table */
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hash = inet6_addr_hash(&ifa->addr);
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hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
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out:
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spin_unlock(&addrconf_hash_lock);
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spin_unlock(&addrconf_hash_lock);
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return err;
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return err;
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