diff options
| author | ps <ps@FreeBSD.org> | 2004-06-23 21:04:37 +0000 |
|---|---|---|
| committer | ps <ps@FreeBSD.org> | 2004-06-23 21:04:37 +0000 |
| commit | f5f3e8600b5cd41c8645b3a5d45e20092a8b9ee1 (patch) | |
| tree | 37eceb1297375660ec2d161a79ee2ec7364248b3 /sys/netinet/tcp.h | |
| parent | 933faf5c3e0325440e1ef2edac115dd64ece174c (diff) | |
| download | FreeBSD-src-f5f3e8600b5cd41c8645b3a5d45e20092a8b9ee1.zip FreeBSD-src-f5f3e8600b5cd41c8645b3a5d45e20092a8b9ee1.tar.gz | |
Add support for TCP Selective Acknowledgements. The work for this
originated on RELENG_4 and was ported to -CURRENT.
The scoreboarding code was obtained from OpenBSD, and many
of the remaining changes were inspired by OpenBSD, but not
taken directly from there.
You can enable/disable sack using net.inet.tcp.do_sack. You can
also limit the number of sack holes that all senders can have in
the scoreboard with net.inet.tcp.sackhole_limit.
Reviewed by: gnn
Obtained from: Yahoo! (Mohan Srinivasan, Jayanth Vijayaraghavan)
Diffstat (limited to 'sys/netinet/tcp.h')
| -rw-r--r-- | sys/netinet/tcp.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/sys/netinet/tcp.h b/sys/netinet/tcp.h index 1eee95c..92460d9 100644 --- a/sys/netinet/tcp.h +++ b/sys/netinet/tcp.h @@ -85,12 +85,15 @@ struct tcphdr { #define TCPOPT_SACK_PERMITTED 4 /* Experimental */ #define TCPOLEN_SACK_PERMITTED 2 #define TCPOPT_SACK 5 /* Experimental */ +#define TCPOLEN_SACK 8 /* 2*sizeof(tcp_seq) */ #define TCPOPT_TIMESTAMP 8 #define TCPOLEN_TIMESTAMP 10 #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ #define TCPOPT_TSTAMP_HDR \ (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) +#define MAX_TCPOPTLEN 40 /* Absolute maximum TCP options len */ + #define TCPOPT_CC 11 /* CC options: RFC-1644 */ #define TCPOPT_CCNEW 12 #define TCPOPT_CCECHO 13 @@ -101,6 +104,15 @@ struct tcphdr { #define TCPOPT_SIGNATURE 19 /* Keyed MD5: RFC 2385 */ #define TCPOLEN_SIGNATURE 18 +/* Option definitions */ +#define TCPOPT_SACK_PERMIT_HDR \ +(TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK_PERMITTED<<8|TCPOLEN_SACK_PERMITTED) +#define TCPOPT_SACK_HDR (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK<<8) +/* Miscellaneous constants */ +#define MAX_SACK_BLKS 6 /* Max # SACK blocks stored at sender side */ +#define TCP_MAX_SACK 3 /* MAX # SACKs sent in any segment */ + + /* * Default maximum segment size for TCP. * With an IP MTU of 576, this is 536, |
