1 files changed, 33 insertions, 0 deletions

diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index 842d833dfc18..262e13c02ec2 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -23,6 +23,39 @@
 #include <net/secure_seq.h>
 #include <net/ip.h>
 
+static unsigned int inet6_ehashfn(struct net *net,
+                                  const struct in6_addr *laddr,
+                                  const u16 lport,
+                                  const struct in6_addr *faddr,
+                                  const __be16 fport)
+{
+        static u32 inet6_ehash_secret __read_mostly;
+        static u32 ipv6_hash_secret __read_mostly;
+
+        u32 lhash, fhash;
+
+        net_get_random_once(&inet6_ehash_secret, sizeof(inet6_ehash_secret));
+        net_get_random_once(&ipv6_hash_secret, sizeof(ipv6_hash_secret));
+
+        lhash = (__force u32)laddr->s6_addr32[3];
+        fhash = __ipv6_addr_jhash(faddr, ipv6_hash_secret);
+
+        return __inet6_ehashfn(lhash, lport, fhash, fport,
+                               inet6_ehash_secret + net_hash_mix(net));
+}
+
+static int inet6_sk_ehashfn(const struct sock *sk)
+{
+        const struct inet_sock *inet = inet_sk(sk);
+        const struct in6_addr *laddr = &sk->sk_v6_rcv_saddr;
+        const struct in6_addr *faddr = &sk->sk_v6_daddr;
+        const __u16 lport = inet->inet_num;
+        const __be16 fport = inet->inet_dport;
+        struct net *net = sock_net(sk);
+
+        return inet6_ehashfn(net, laddr, lport, faddr, fport);
+}
+
 int __inet6_hash(struct sock *sk, struct inet_timewait_sock *tw)
 {
         struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;