TCP UTO - Weekly Report 5

[Catalin Nicutar]

Hello!

This is the fifth report for TCP UTO.

* Short TCP UTO description
UTO stands for User Timeout Option (it is described in RFC5482). TCP UTO
specifies a peer should be allowed to advertise its chosen `User Timeout'
for a connection.
The wiki page for this project: http://wiki.freebsd.org/CatalinNicutar/TCPUTO


* Work completed last week
    * The options weren't correctly inherited from a listening socket
    * When using UTO, no keepalives are sent (RFC 5482 4.2)
    * The connection was dropped whenever TCP_MAXRXTSHIFT retransmits had
    been performed. Now (if using UTO) it is reset if the USER_TIMEOUT is
    exceeded.

* My goals for for this week
    * Consider the implications of changing the retransmit timer and
    stopping the keepalive timer (RFC 5482 only specified that a timeout
    > USER_TIMEOUT must be chosen)
    * Consider performing retransmits beyond TCP_MAXRXTSHIFT when in UTO
    * When waiting in UTO, ICMP destination unreachable messages must be
    ignored

If you have questions, suggestions or advices drop me an email to
cnicutar at FreeBSD.org.