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net: TCP_MSS_DEFAULT, TCP_MSS_DESIRED

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Define two symbols needed in both kernel and user space.

Remove old (somewhat incorrect) kernel variant that wasn't used in
most cases.  Default should apply to both RMSS and SMSS (RFC2581).

Replace numeric constants with defined symbols.

Stand-alone patch, originally developed for TCPCT.

Signed-off-by: William.Allen.Simpson@gmail.com
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
William Allen Simpson
2009-11-10 09:51:18 +00:00
committed by David S. Miller
parent cbbef5e183
commit bee7ca9ec0
6 changed files with 13 additions and 10 deletions
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6
include/linux/tcp.h
View File

@@ -81,6 +81,12 @@ enum {
TCP_DATA_OFFSET = __cpu_to_be32(0xF0000000)
};
/*
* TCP general constants
*/
#define TCP_MSS_DEFAULT 536U /* IPv4 (RFC1122, RFC2581) */
#define TCP_MSS_DESIRED 1220U /* IPv6 (tunneled), EDNS0 (RFC3226) */
/* TCP socket options */
#define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */
#define TCP_MAXSEG 2 /* Limit MSS */

3
include/net/tcp.h
View File

@@ -62,9 +62,6 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo);
/* Minimal accepted MSS. It is (60+60+8) - (20+20). */
#define TCP_MIN_MSS 88U
/* Minimal RCV_MSS. */
#define TCP_MIN_RCVMSS 536U
/* The least MTU to use for probing */
#define TCP_BASE_MSS 512