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tcp: simplify fast open cookie processing

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Consolidate various cookie checking and generation code to simplify
the fast open processing. The main goal is to reduce code duplication
in tcp_v4_conn_request() for IPv6 support.

Removes two experimental sysctl flags TFO_SERVER_ALWAYS and
TFO_SERVER_COOKIE_NOT_CHKD used primarily for developmental debugging
purposes.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Daniel Lee <longinus00@gmail.com>
Signed-off-by: Jerry Chu <hkchu@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuchung Cheng
2014-05-11 20:22:10 -07:00
committed by David S. Miller
parent 5b7ed0892f
commit 89278c9dc9
5 changed files with 33 additions and 64 deletions
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9
include/net/tcp.h
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@@ -220,8 +220,6 @@ void tcp_time_wait(struct sock *sk, int state, int timeo);
#define TFO_SERVER_ENABLE 2
#define TFO_CLIENT_NO_COOKIE 4 /* Data in SYN w/o cookie option */
/* Process SYN data but skip cookie validation */
#define TFO_SERVER_COOKIE_NOT_CHKED 0x100
/* Accept SYN data w/o any cookie option */
#define TFO_SERVER_COOKIE_NOT_REQD 0x200
@@ -230,10 +228,6 @@ void tcp_time_wait(struct sock *sk, int state, int timeo);
*/
#define TFO_SERVER_WO_SOCKOPT1 0x400
#define TFO_SERVER_WO_SOCKOPT2 0x800
/* Always create TFO child sockets on a TFO listener even when
* cookie/data not present. (For testing purpose!)
*/
#define TFO_SERVER_ALWAYS 0x1000
extern struct inet_timewait_death_row tcp_death_row;
@@ -1335,8 +1329,7 @@ int tcp_fastopen_create_child(struct sock *sk,
struct request_sock *req);
bool tcp_fastopen_check(struct sock *sk, struct sk_buff *skb,
struct request_sock *req,
struct tcp_fastopen_cookie *foc,
struct tcp_fastopen_cookie *valid_foc);
struct tcp_fastopen_cookie *foc);
void tcp_fastopen_init_key_once(bool publish);
#define TCP_FASTOPEN_KEY_LENGTH 16