This target is used to set the Netfilter mark value associated with the packet.
The target can only be used in the \fBmangle\fR table. It can, for example, be
used in conjunction with routing based on fwmark (needs iproute2).
.TP
\fB--set-xmark\fR \fIvalue\fR[\fB/\fR\fImask\fR]
Zeroes out the bits given by \fImask\fR and XORs \fIvalue\fR into the packet
mark ("nfmark"). If \fImask\fR is omitted, 0xFFFFFFFF is assumed.
.TP
\fB--set-mark\fR \fIvalue\fR[\fB/\fR\fImask\fR]
Zeroes out the bits given by \fImask\fR and ORs \fIvalue\fR into the packet
mark. If \fImask\fR is omitted, 0xFFFFFFFF is assumed.
.PP
The following mnemonics are available:
.TP
\fB--and-mark\fR \fIbits\fR
Binary AND the nfmark with \fIbits\fR. (Mnemonic for \fB--set-xmark
0/\fR\fIinvbits\fR, where \fIinvbits\fR is the binary negation of \fIbits\fR.)
.TP
\fB--or-mark\fR \fIbits\fR
Binary OR the nfmark with \fIbits\fR. (Mnemonic for \fB--set-xmark\fR
\fIbits\fR\fB/\fR\fIbits\fR.)
.TP
\fB--xor-mark\fR \fIbits\fR
Binary XOR the nfmark with \fIbits\fR. (Mnemonic for \fB--set-xmark\fR
\fIbits\fR\fB/0\fR.)