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authorHannes Frederic Sowa <hannes@stressinduktion.org>2013-10-19 23:48:57 +0400
committerDavid S. Miller <davem@davemloft.net>2013-10-20 03:45:35 +0400
commit1bbdceef1e535add893bf71d7b7ab102e4eb69eb (patch)
treee2eed21c778d0a6458f8350ce5f6fbfc6c58810e /net/ipv6/udp.c
parentb23a002fc6f0c19846ee0382f019429af54a27e9 (diff)
downloadlinux-1bbdceef1e535add893bf71d7b7ab102e4eb69eb.tar.xz
inet: convert inet_ehash_secret and ipv6_hash_secret to net_get_random_once
Initialize the ehash and ipv6_hash_secrets with net_get_random_once. Each compilation unit gets its own secret now: ipv4/inet_hashtables.o ipv4/udp.o ipv6/inet6_hashtables.o ipv6/udp.o rds/connection.o The functions still get inlined into the hashing functions. In the fast path we have at most two (needed in ipv6) if (unlikely(...)). Cc: Eric Dumazet <edumazet@google.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/udp.c')
-rw-r--r--net/ipv6/udp.c17
1 files changed, 14 insertions, 3 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 324bd36c23bc..44fc4e3d661f 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -59,10 +59,21 @@ static unsigned int udp6_ehashfn(struct net *net,
const struct in6_addr *faddr,
const __be16 fport)
{
- const u32 lhash = (__force u32)laddr->s6_addr32[3];
- const u32 fhash = __ipv6_addr_jhash(faddr, ipv6_hash_secret);
+ static u32 udp6_ehash_secret __read_mostly;
+ static u32 udp_ipv6_hash_secret __read_mostly;
+
+ u32 lhash, fhash;
+
+ net_get_random_once(&udp6_ehash_secret,
+ sizeof(udp6_ehash_secret));
+ net_get_random_once(&udp_ipv6_hash_secret,
+ sizeof(udp_ipv6_hash_secret));
+
+ lhash = (__force u32)laddr->s6_addr32[3];
+ fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret);
+
return __inet6_ehashfn(lhash, lport, fhash, fport,
- inet_ehash_secret + net_hash_mix(net));
+ udp_ipv6_hash_secret + net_hash_mix(net));
}
int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)