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 <dada1@cosmosbay.com>
Signed-off-by: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
parent 988b7050

net/ipv4/syncookies.c

+3 −1
Original line number Diff line number Diff line
@@ -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;