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authorEric Dumazet <dada1@cosmosbay.com>2008-02-07 10:40:19 +0100
committerYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>2008-03-04 15:18:21 +0900
commit11baab7ac34723ad481e0f97fca733272ef364d4 (patch)
tree611ed2f14f6e3c9d36d748094e4c9c736caa699b /net/ipv4/syncookies.c
parent988b705077d8f922408913f4f521ae073256d4a1 (diff)
[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: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Diffstat (limited to 'net/ipv4/syncookies.c')
-rw-r--r--net/ipv4/syncookies.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index f470fe4511d..177da14f6b1 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -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;