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Fix the TCP MSS calculation.

This commit is contained in:
whitequark 2017-01-31 11:39:33 +00:00
parent c0074eda11
commit 255d69d63b
1 changed files with 5 additions and 1 deletions
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6
src/socket/tcp.rs
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@ -965,6 +965,10 @@ impl<'a> TcpSocket<'a> {
repr.ack_number = Some(ack_number);
self.remote_last_ack = ack_number;
// Remember the header length before enabling the MSS option, since that option
// only affects SYN packets.
let header_len = repr.header_len();
if repr.control == TcpControl::Syn {
// First enable the option, without assigning any value, to get a correct
// result for (ip_repr:Unspecified).payload_len below.
@ -980,7 +984,7 @@ impl<'a> TcpSocket<'a> {
let ip_repr = try!(ip_repr.lower(&[]));
if repr.control == TcpControl::Syn {
let mtu = mtu - repr.header_len() - ip_repr.buffer_len();
let mtu = mtu - header_len - ip_repr.buffer_len();
repr.max_seg_size = Some(mtu as u16);
}