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Diffstat (limited to 'extensions/libxt_conntrack.man')
-rw-r--r-- | extensions/libxt_conntrack.man | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/extensions/libxt_conntrack.man b/extensions/libxt_conntrack.man new file mode 100644 index 00000000..b852bca9 --- /dev/null +++ b/extensions/libxt_conntrack.man @@ -0,0 +1,71 @@ +This module, when combined with connection tracking, allows access to the +connection tracking state for this packet/connection. +.TP +[\fB!\fR] \fB--ctstate\fR \fIstatelist\fR +\fIstatelist\fR is a comma separated list of the connection states to match. +Possible states are listed below. +.TP +[\fB!\fR] \fB--ctproto\fR \fIl4proto\fR +Layer-4 protocol to match (by number or name) +.TP +[\fB!\fR] \fB--ctorigsrc\fR \fIaddress\fR[\fB/\fR\fImask\fR] +Match against original source address +.TP +[\fB!\fR] \fB--ctorigdst\fR \fIaddress\fR[\fB/\fR\fImask\fR] +Match against original destination address +.TP +[\fB!\fR] \fB--ctreplsrc\fR \fIaddress\fR[\fB/\fR\fImask\fR] +Match against reply source address +.TP +[\fB!\fR] \fB--ctrepldst\fR \fIaddress\fR[\fB/\fR\fImask\fR] +Match against reply destination address +.TP +[\fB!\fR] \fB--ctstatus\fR \fIstatelist\fR +\fIstatuslist\fR is a comma separated list of the connection statuses to match. +Possible statuses are listed below. +.TP +[\fB!\fR] \fB--ctexpire\fR \fItime\fR[\fB:\fR\fItime\fR] +Match remaining lifetime in seconds against given value or range of values +(inclusive) +.PP +States for \fB--ctstate\fR: +.TP +\fBINVALID\fR +meaning that the packet is associated with no known connection +.TP +\fBNEW\fR +meaning that the packet has started a new connection, or otherwise associated +with a connection which has not seen packets in both directions, and +.TP +\fBESTABLISHED\fR +meaning that the packet is associated with a connection which has seen packets +in both directions, +.TP +\fBRELATED\fR +meaning that the packet is starting a new connection, but is associated with an +existing connection, such as an FTP data transfer, or an ICMP error. +.TP +\fBSNAT\fR +A virtual state, matching if the original source address differs from the reply +destination. +.TP +\fBDNAT\fR +A virtual state, matching if the original destination differs from the reply +source. +.PP +Statuses for \fB--ctstatus\fR: +.TP +\fBNONE\fR +None of the below. +.TP +\fBEXPECTED\fR +This is an expected connection (i.e. a conntrack helper set it up) +.TP +\fBSEEN_REPLY\fR +Conntrack has seen packets in both directions. +.TP +\fBASSURED\fR +Conntrack entry should never be early-expired. +.TP +\fBCONFIRMED\fR +Connection is confirmed: originating packet has left box. |