ipv6: addrconf: add per netns perturbation in inet6_addr_hash()

Bring IPv6 in par with IPv4 :

- Use net_hash_mix() to spread addresses a bit more.
- Use 256 slots hash table instead of 16

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index b8b1643..15b5ffd 100644 (file)
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -58,7 +58,7 @@ struct in6_validator_info {
        struct netlink_ext_ack  *extack;
 };
 
-#define IN6_ADDR_HSIZE_SHIFT   4
+#define IN6_ADDR_HSIZE_SHIFT   8
 #define IN6_ADDR_HSIZE         (1 << IN6_ADDR_HSIZE_SHIFT)
 
 int addrconf_init(void);

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index c1a5028..d70d981 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -950,9 +950,11 @@ ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
        list_add_tail_rcu(&ifp->if_list, p);
 }
 
-static u32 inet6_addr_hash(const struct in6_addr *addr)
+static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
 {
-       return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
+       u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
+
+       return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
 }
 
 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
@@ -973,7 +975,7 @@ static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
 
 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
 {
-       unsigned int hash = inet6_addr_hash(&ifa->addr);
+       unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
        int err = 0;
 
        spin_lock(&addrconf_hash_lock);
@@ -1838,8 +1840,8 @@ int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
                            const struct net_device *dev, int strict,
                            u32 banned_flags)
 {
+       unsigned int hash = inet6_addr_hash(net, addr);
        struct inet6_ifaddr *ifp;
-       unsigned int hash = inet6_addr_hash(addr);
        u32 ifp_flags;
 
        rcu_read_lock_bh();
@@ -1917,8 +1919,8 @@ EXPORT_SYMBOL(ipv6_chk_prefix);
 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
                                     struct net_device *dev, int strict)
 {
+       unsigned int hash = inet6_addr_hash(net, addr);
        struct inet6_ifaddr *ifp, *result = NULL;
-       unsigned int hash = inet6_addr_hash(addr);
 
        rcu_read_lock_bh();
        hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
@@ -4242,9 +4244,9 @@ void if6_proc_exit(void)
 /* Check if address is a home address configured on any interface. */
 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
 {
-       int ret = 0;
+       unsigned int hash = inet6_addr_hash(net, addr);
        struct inet6_ifaddr *ifp = NULL;
-       unsigned int hash = inet6_addr_hash(addr);
+       int ret = 0;
 
        rcu_read_lock_bh();
        hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {