diff options
| author | Hannes Frederic Sowa <hannes@stressinduktion.org> | 2013-10-19 21:48:56 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-10-19 19:45:35 -0400 |
| commit | b23a002fc6f0c19846ee0382f019429af54a27e9 (patch) | |
| tree | 9cb494a707c4145a8a42f0cf6eb6853e487f06a5 /net/ipv4/syncookies.c | |
| parent | a48e42920ff38bc90bbf75143fff4555723d4540 (diff) | |
| download | lwn-b23a002fc6f0c19846ee0382f019429af54a27e9.tar.gz lwn-b23a002fc6f0c19846ee0382f019429af54a27e9.zip | |
inet: split syncookie keys for ipv4 and ipv6 and initialize with net_get_random_once
This patch splits the secret key for syncookies for ipv4 and ipv6 and
initializes them with net_get_random_once. This change was the reason I
did this series. I think the initialization of the syncookie_secret is
way to early.
Cc: Florian Westphal <fw@strlen.de>
Cc: Eric Dumazet <edumazet@google.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/syncookies.c')
| -rw-r--r-- | net/ipv4/syncookies.c | 15 |
1 files changed, 5 insertions, 10 deletions
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c index 3b64c59b4109..b95331e6c077 100644 --- a/net/ipv4/syncookies.c +++ b/net/ipv4/syncookies.c @@ -25,15 +25,7 @@ extern int sysctl_tcp_syncookies; -__u32 syncookie_secret[2][16-4+SHA_DIGEST_WORDS]; -EXPORT_SYMBOL(syncookie_secret); - -static __init int init_syncookies(void) -{ - get_random_bytes(syncookie_secret, sizeof(syncookie_secret)); - return 0; -} -__initcall(init_syncookies); +static u32 syncookie_secret[2][16-4+SHA_DIGEST_WORDS]; #define COOKIEBITS 24 /* Upper bits store count */ #define COOKIEMASK (((__u32)1 << COOKIEBITS) - 1) @@ -44,8 +36,11 @@ static DEFINE_PER_CPU(__u32 [16 + 5 + SHA_WORKSPACE_WORDS], static u32 cookie_hash(__be32 saddr, __be32 daddr, __be16 sport, __be16 dport, u32 count, int c) { - __u32 *tmp = __get_cpu_var(ipv4_cookie_scratch); + __u32 *tmp; + + net_get_random_once(syncookie_secret, sizeof(syncookie_secret)); + tmp = __get_cpu_var(ipv4_cookie_scratch); memcpy(tmp + 4, syncookie_secret[c], sizeof(syncookie_secret[c])); tmp[0] = (__force u32)saddr; tmp[1] = (__force u32)daddr; |