diff options
| author | Florian Westphal <fw@strlen.de> | 2008-03-23 22:21:28 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-03-23 22:21:28 -0700 |
| commit | 2051f11fb86b0056fec440fe7e9fa8370d60a5c6 (patch) | |
| tree | e93befbb8fb6590994b51aa213bf9596c0070bc1 | |
| parent | 310afe86af8ddd96a06b75aa61ef1af233f80e89 (diff) | |
| download | blackbird-op-linux-2051f11fb86b0056fec440fe7e9fa8370d60a5c6.tar.gz blackbird-op-linux-2051f11fb86b0056fec440fe7e9fa8370d60a5c6.zip | |
[TCP]: Shrink syncookie_secret by 8 byte.
the first u32 copied from syncookie_secret is overwritten by the
minute-counter four lines below. After adjusting the destination
address, the size of syncookie_secret can be reduced accordingly.
AFAICS, the only other user of syncookie_secret[] is the ipv6
syncookie support. Because ipv6 syncookies only grab 44 bytes from
syncookie_secret[], this shouldn't affect them in any way.
With fixes from Glenn Griffin.
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Glenn Griffin <ggriffin.kernel@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/net/tcp.h | 2 | ||||
| -rw-r--r-- | net/ipv4/syncookies.c | 4 | ||||
| -rw-r--r-- | net/ipv6/syncookies.c | 2 |
3 files changed, 4 insertions, 4 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 67cc3956d29c..723b36851dde 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -436,7 +436,7 @@ extern int tcp_disconnect(struct sock *sk, int flags); extern void tcp_unhash(struct sock *sk); /* From syncookies.c */ -extern __u32 syncookie_secret[2][16-3+SHA_DIGEST_WORDS]; +extern __u32 syncookie_secret[2][16-4+SHA_DIGEST_WORDS]; extern struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb, struct ip_options *opt); extern __u32 cookie_v4_init_sequence(struct sock *sk, struct sk_buff *skb, diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c index 4704f27f6c0b..abc752d45cf7 100644 --- a/net/ipv4/syncookies.c +++ b/net/ipv4/syncookies.c @@ -21,7 +21,7 @@ extern int sysctl_tcp_syncookies; -__u32 syncookie_secret[2][16-3+SHA_DIGEST_WORDS]; +__u32 syncookie_secret[2][16-4+SHA_DIGEST_WORDS]; EXPORT_SYMBOL(syncookie_secret); static __init int init_syncookies(void) @@ -41,7 +41,7 @@ static u32 cookie_hash(__be32 saddr, __be32 daddr, __be16 sport, __be16 dport, { __u32 *tmp = __get_cpu_var(cookie_scratch); - memcpy(tmp + 3, syncookie_secret[c], sizeof(syncookie_secret[c])); + 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; diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c index 827c5aa7524c..3a622e7abc02 100644 --- a/net/ipv6/syncookies.c +++ b/net/ipv6/syncookies.c @@ -22,7 +22,7 @@ #include <net/tcp.h> extern int sysctl_tcp_syncookies; -extern __u32 syncookie_secret[2][16-3+SHA_DIGEST_WORDS]; +extern __u32 syncookie_secret[2][16-4+SHA_DIGEST_WORDS]; #define COOKIEBITS 24 /* Upper bits store count */ #define COOKIEMASK (((__u32)1 << COOKIEBITS) - 1) |
