Merge branch 'for-4.12/asus' into for-linus

1 files changed, 5 insertions, 16 deletions

diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 3e88467d70ee..496b97e17aaf 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -13,13 +13,13 @@
 #include <linux/tcp.h>
 #include <linux/slab.h>
 #include <linux/random.h>
-#include <linux/cryptohash.h>
+#include <linux/siphash.h>
 #include <linux/kernel.h>
 #include <linux/export.h>
 #include <net/tcp.h>
 #include <net/route.h>
 
-static u32 syncookie_secret[2][16-4+SHA_DIGEST_WORDS] __read_mostly;
+static siphash_key_t syncookie_secret[2] __read_mostly;
 
 #define COOKIEBITS 24	/* Upper bits store count */
 #define COOKIEMASK (((__u32)1 << COOKIEBITS) - 1)
@@ -48,24 +48,13 @@ static u32 syncookie_secret[2][16-4+SHA_DIGEST_WORDS] __read_mostly;
 #define TSBITS	6
 #define TSMASK	(((__u32)1 << TSBITS) - 1)
 
-static DEFINE_PER_CPU(__u32 [16 + 5 + SHA_WORKSPACE_WORDS], ipv4_cookie_scratch);
-
 static u32 cookie_hash(__be32 saddr, __be32 daddr, __be16 sport, __be16 dport,
 		       u32 count, int c)
 {
-	__u32 *tmp;
-
 	net_get_random_once(syncookie_secret, sizeof(syncookie_secret));
-
-	tmp  = this_cpu_ptr(ipv4_cookie_scratch);
-	memcpy(tmp + 4, syncookie_secret[c], sizeof(syncookie_secret[c]));
-	tmp[0] = (__force u32)saddr;
-	tmp[1] = (__force u32)daddr;
-	tmp[2] = ((__force u32)sport << 16) + (__force u32)dport;
-	tmp[3] = count;
-	sha_transform(tmp + 16, (__u8 *)tmp, tmp + 16 + 5);
-
-	return tmp[17];
+	return siphash_4u32((__force u32)saddr, (__force u32)daddr,
+			    (__force u32)sport << 16 | (__force u32)dport,
+			    count, &syncookie_secret[c]);
 }