From 2646c831c00c5d22aa72b79d24069c1b412cda7c Mon Sep 17 00:00:00 2001
From: Daniel Lee <Longinus00@gmail.com>
Date: Mon, 6 Apr 2015 14:37:27 -0700
Subject: tcp: RFC7413 option support for Fast Open client
Fast Open has been using an experimental option with a magic number
(RFC6994). This patch makes the client by default use the RFC7413
option (34) to get and send Fast Open cookies. This patch makes
the client solicit cookies from a given server first with the
RFC7413 option. If that fails to elicit a cookie, then it tries
the RFC6994 experimental option. If that also fails, it uses the
RFC7413 option on all subsequent connect attempts. If the server
returns a Fast Open cookie then the client caches the form of the
option that successfully elicited a cookie, and uses that form on
later connects when it presents that cookie.
The idea is to gradually obsolete the use of experimental options as
the servers and clients upgrade, while keeping the interoperability
meanwhile.
Signed-off-by: Daniel Lee <Longinus00@gmail.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
include/net/tcp.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
(limited to 'include/net/tcp.h')
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 7292c3c575bc..9598871485ce 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1339,7 +1339,8 @@ void tcp_fastopen_cache_get(struct sock *sk, u16 *mss,
struct tcp_fastopen_cookie *cookie, int *syn_loss,
unsigned long *last_syn_loss);
void tcp_fastopen_cache_set(struct sock *sk, u16 mss,
- struct tcp_fastopen_cookie *cookie, bool syn_lost);
+ struct tcp_fastopen_cookie *cookie, bool syn_lost,
+ u16 try_exp);
struct tcp_fastopen_request {
/* Fast Open cookie. Size 0 means a cookie request */
struct tcp_fastopen_cookie cookie;
--
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