From a0e0018c9a7ef5ce7f6d2c3ae16aecbbd16a8f67 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 4 May 2024 16:18:53 +0200 Subject: Adding upstream version 6.1.0. Signed-off-by: Daniel Baumann --- man/man8/tc-csum.8 | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 man/man8/tc-csum.8 (limited to 'man/man8/tc-csum.8') diff --git a/man/man8/tc-csum.8 b/man/man8/tc-csum.8 new file mode 100644 index 0000000..65724b8 --- /dev/null +++ b/man/man8/tc-csum.8 @@ -0,0 +1,72 @@ +.TH "Checksum action in tc" 8 "11 Jan 2015" "iproute2" "Linux" + +.SH NAME +csum - checksum update action +.SH SYNOPSIS +.in +8 +.ti -8 +.BR tc " ... " "action csum" +.I UPDATE + +.ti -8 +.IR UPDATE " := " TARGET " [ " UPDATE " ]" + +.ti -8 +.IR TARGET " := { " +.BR ip4h " |" +.BR icmp " |" +.BR igmp " |" +.BR tcp " |" +.BR udp " |" +.BR udplite " |" +.BR sctp " |" +.IR SWEETS " }" + +.ti -8 +.IR SWEETS " := { " +.BR and " | " or " | " + " }" +.SH DESCRIPTION +The +.B csum +action triggers checksum recalculation of specified packet headers. It is +commonly used to fix incorrect checksums after the +.B pedit +action has modified the packet content. +.SH OPTIONS +.TP +.I TARGET +Specify which headers to update: IPv4 header +.RB ( ip4h ), +ICMP header +.RB ( icmp ), +IGMP header +.RB ( igmp ), +TCP header +.RB ( tcp ), +UDP header +.RB ( udp ), +UDPLite header +.RB ( udplite ") or" +SCTP header +.RB ( sctp ). +.TP +.B SWEETS +These are merely syntactic sugar and ignored internally. +.SH EXAMPLES +The following performs stateless NAT for incoming packets from 192.0.2.100 to +new destination 198.51.100.1. Assuming these are UDP +packets, both IP and UDP checksums have to be recalculated: + +.RS +.EX +# tc qdisc add dev eth0 ingress handle ffff: +# tc filter add dev eth0 prio 1 protocol ip parent ffff: \\ + u32 match ip src 192.0.2.100/32 flowid :1 \\ + action pedit munge ip dst set 198.51.100.1 pipe \\ + csum ip and udp +.EE +.RE + +.SH SEE ALSO +.BR tc (8), +.BR tc-pedit (8) -- cgit v1.2.3