diff options
| author | Phil Sutter <phil@nwl.cc> | 2017-10-09 15:47:39 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2017-10-17 14:12:47 +0200 |
| commit | dbbab0aa328f136502373a1031e64eb53fa113e5 (patch) | |
| tree | 557f0aaee2a2d7059f208b29d8b90860f78f08a2 /extensions/libxt_tcpmss.man | |
| parent | 0e9582814a201a29be42d096fe36723fa16078da (diff) | |
extensions: libxt_tcpmss: Detect invalid ranges
Previously, an MSS range of e.g. 65535:1000 was silently accepted but
would then never match a packet since the kernel checks whether the MSS
value is greater than or equal to the first *and* less than or equal to
the second value.
Detect this as a parameter problem and update the man page accordingly.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'extensions/libxt_tcpmss.man')
| -rw-r--r-- | extensions/libxt_tcpmss.man | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/extensions/libxt_tcpmss.man b/extensions/libxt_tcpmss.man index 8ee715cd..8253c363 100644 --- a/extensions/libxt_tcpmss.man +++ b/extensions/libxt_tcpmss.man @@ -1,4 +1,4 @@ This matches the TCP MSS (maximum segment size) field of the TCP header. You can only use this on TCP SYN or SYN/ACK packets, since the MSS is only negotiated during the TCP handshake at connection startup time. .TP [\fB!\fP] \fB\-\-mss\fP \fIvalue\fP[\fB:\fP\fIvalue\fP] -Match a given TCP MSS value or range. +Match a given TCP MSS value or range. If a range is given, the second \fIvalue\fP must be greater than or equal to the first \fIvalue\fP. |