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net/tcp-fastopen: refactor cookie check logic

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Refactor the cookie check logic in tcp_send_syn_data() into a function.
This function will be called else where in later changes.

Signed-off-by: Wei Wang <weiwan@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wei Wang 2017-01-23 10:59:20 -08:00 • committed by David S. Miller
parent a9c54ad2c7
commit 065263f40f
3 changed files with 25 additions and 14 deletions
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21
net/ipv4/tcp_fastopen.c
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@ -325,3 +325,24 @@ fastopen:
*foc = valid_foc;
return NULL;
}
bool tcp_fastopen_cookie_check(struct sock *sk, u16 *mss,
struct tcp_fastopen_cookie *cookie)
{
unsigned long last_syn_loss = 0;
int syn_loss = 0;
tcp_fastopen_cache_get(sk, mss, cookie, &syn_loss, &last_syn_loss);
/* Recurring FO SYN losses: no cookie or data in SYN */
if (syn_loss > 1 &&
time_before(jiffies, last_syn_loss + (60*HZ << syn_loss))) {
cookie->len = -1;
return false;
}
if (sysctl_tcp_fastopen & TFO_CLIENT_NO_COOKIE) {
cookie->len = -1;
return true;
}
return cookie->len > 0;
}