openslx-ng/ipxe.git/src/include/gpxe/tcp.h, branch v0.9.9

[tcp] Improve robustness in the presence of duplicated received packets

2009-06-23T08:40:26+00:00

gPXE responds to duplicated ACKs with an immediate retransmission, which can lead to a sorceror's apprentice syndrome. It also responds to out-of-range (or old duplicate) ACKs with a RST, which can cause valid connections to be dropped. Fix the sorceror's apprentice syndrome by leaving the retransmission timer running (and so inhibiting the immediate retransmission) when we receive a potential duplicate ACK. This seems to match the behaviour of Linux observed via wireshark traces. Fix the RST issue by sending RST only on out-of-range ACKs that occur before the connection is fully established, as per RFC 793. These problems were exposed during development of the 802.11 wireless link layer; the 802.11 protocol has a failure mode that can easily cause duplicated packets. The fixes were tested in a controlled way by faking large numbers of duplicated packets in the rtl8139 driver. Originally-fixed-by: Joshua Oreman

[legal] Add a selection of FILE_LICENCE declarations

2009-05-18T07:33:25+00:00

Add FILE_LICENCE declarations to almost all files that make up the various standard builds of gPXE.

Modify gPXE core and drivers to work with the new timer subsystem

2008-03-02T00:41:10+00:00

Signed-off-by: Alexey Zaytsev

IB can't afford many RX buffers, because the MTU is so large. Reduce

2007-09-18T06:02:41+00:00

the TCP window to compensate.

Add support for TCP timestamps

2007-07-13T10:32:53+00:00

Remove some obsolete stream-API files

2007-07-09T02:53:06+00:00

Limit xmit window to one MTU. (Path MTU discovery not yet

2007-07-08T13:33:53+00:00

implemented; should be done at some point.)

Updated tcp.c to provide a standardised data transfer interface.

2007-05-25T15:58:42+00:00

pkbuff->iobuf changeover

2007-05-19T18:39:40+00:00

Achieved via Perl using: perl -pi -e 's/pk_buff/io_buffer/g; s/Packet buffer/I\/O buffer/ig; ' \ -e 's/pkbuff\.h/iobuf.h/g; s/pkb_/iob_/g; s/_pkb/_iob/g; ' \ -e 's/pkb/iobuf/g; s/PKB/IOB/g;'

Changed to use the generic stream API.

2007-01-31T02:09:13+00:00