Linux cli command tc-csum

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command tc-csum and provides detailed information about the command tc-csum, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the tc-csum.

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NAME 🖥️ tc-csum 🖥️

checksum update action

SYNOPSIS

tc … action csum UPDATE

UPDATE := TARGET [ UPDATE ]

TARGET := { ip4h | icmp | igmp | tcp | udp | udplite | sctp | SWEETS }

SWEETS := { and | or | + }

DESCRIPTION

The csum action triggers checksum recalculation of specified packet headers. It is commonly used to fix incorrect checksums after the pedit action has modified the packet content.

OPTIONS

TARGET
Specify which headers to update: 2020-01-01

SWEETS
These are merely syntactic sugar and ignored internally.

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:

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

SEE ALSO

tc(8), tc-pedit(8)

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