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authorWei Wang <weiwan@google.com>2017-01-23 21:59:20 +0300
committerDavid S. Miller <davem@davemloft.net>2017-01-25 22:04:38 +0300
commit065263f40f0972d5f1cd294bb0242bd5aa5f06b2 (patch)
treec8d7915e4b9cb64a7e069b2842897af5b5c73f85 /net/ipv4/tcp_fastopen.c
parenta9c54ad2c737853b1f404b10b09da4ca7fa18597 (diff)
downloadlinux-065263f40f0972d5f1cd294bb0242bd5aa5f06b2.tar.xz
net/tcp-fastopen: refactor cookie check logic
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>
Diffstat (limited to 'net/ipv4/tcp_fastopen.c')
-rw-r--r--net/ipv4/tcp_fastopen.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/net/ipv4/tcp_fastopen.c b/net/ipv4/tcp_fastopen.c
index f51919535ca7..f90e09e1ff4c 100644
--- a/net/ipv4/tcp_fastopen.c
+++ b/net/ipv4/tcp_fastopen.c
@@ -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;
+}