Commit 11baab7a authored by Eric Dumazet's avatar Eric Dumazet Committed by YOSHIFUJI Hideaki
Browse files

[TCP]: lower stack usage in cookie_hash() function

400 bytes allocated on stack might be a litle bit too much. Using a
per_cpu var is more friendly.
Signed-off-by: default avatarEric Dumazet <>
Signed-off-by: default avatarYOSHIFUJI Hideaki <>
parent 988b7050
......@@ -35,10 +35,12 @@ module_init(init_syncookies);
#define COOKIEBITS 24 /* Upper bits store count */
#define COOKIEMASK (((__u32)1 << COOKIEBITS) - 1)
static DEFINE_PER_CPU(__u32, cookie_scratch)[16 + 5 + SHA_WORKSPACE_WORDS];
static u32 cookie_hash(__be32 saddr, __be32 daddr, __be16 sport, __be16 dport,
u32 count, int c)
__u32 tmp[16 + 5 + SHA_WORKSPACE_WORDS];
__u32 *tmp = __get_cpu_var(cookie_scratch);
memcpy(tmp + 3, syncookie_secret[c], sizeof(syncookie_secret[c]));
tmp[0] = (__force u32)saddr;
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment