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author | Bhasker Hariharan <bhaskerh@google.com> | 2019-11-07 09:45:26 -0800 |
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committer | gVisor bot <gvisor-bot@google.com> | 2019-11-07 09:46:55 -0800 |
commit | 66ebb6575f929a389d3c929977ed5e31d706fcfe (patch) | |
tree | 64fe7cdb0ad62948a54f58341f8304b586fe26e5 /pkg/linewriter/BUILD | |
parent | 2326224a9652201938df2881be055ab352672587 (diff) |
Add support for TIME_WAIT timeout.
This change adds explicit support for honoring the 2MSL timeout
for sockets in TIME_WAIT state. It also adds support for the
TCP_LINGER2 option that allows modification of the FIN_WAIT2
state timeout duration for a given socket.
It also adds an option to modify the Stack wide TIME_WAIT timeout
but this is only for testing. On Linux this is fixed at 60s.
Further, we also now correctly process RST's in CLOSE_WAIT and
close the socket similar to linux without moving it to error
state.
We also now handle SYN in ESTABLISHED state as per
RFC5961#section-4.1. Earlier we would just drop these SYNs.
Which can result in some tests that pass on linux to fail on
gVisor.
Netstack now honors TIME_WAIT correctly as well as handles the
following cases correctly.
- TCP RSTs in TIME_WAIT are ignored.
- A duplicate TCP FIN during TIME_WAIT extends the TIME_WAIT
and a dup ACK is sent in response to the FIN as the dup FIN
indicates potential loss of the original final ACK.
- An out of order segment during TIME_WAIT generates a dup ACK.
- A new SYN w/ a sequence number > the highest sequence number
in the previous connection closes the TIME_WAIT early and
opens a new connection.
Further to make the SYN case work correctly the ISN (Initial
Sequence Number) generation for Netstack has been updated to
be as per RFC. Its not a pure random number anymore and follows
the recommendation in https://tools.ietf.org/html/rfc6528#page-3.
The current hash used is not a cryptographically secure hash
function. A separate change will update the hash function used
to Siphash similar to what is used in Linux.
PiperOrigin-RevId: 279106406
Diffstat (limited to 'pkg/linewriter/BUILD')
0 files changed, 0 insertions, 0 deletions