SKB_CHECKSUM_COMPLET(9) Linux Networking SKB_CHECKSUM_COMPLET(9)NAME
skb_checksum_complete - Calculate checksum of an entire packet
SYNOPSIS
__sum16 skb_checksum_complete(struct sk_buff * skb);
ARGUMENTS
skb
packet to process
DESCRIPTION
This function calculates the checksum over the entire packet plus the value of skb->csum. The latter can be used to supply the checksum of
a pseudo header as used by TCP/UDP. It returns the checksum.
For protocols that contain complete checksums such as ICMP/TCP/UDP, this function can be used to verify that checksum on received packets.
In that case the function should return zero if the checksum is correct. In particular, this function will return zero if skb->ip_summed is
CHECKSUM_UNNECESSARY which indicates that the hardware has already verified the correctness of the checksum.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 SKB_CHECKSUM_COMPLET(9)
Check Out this Related Man Page
Checksum action in tc(8) Linux Checksum action in tc(8)NAME
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: IPv4 header (ip4h), ICMP header (icmp), IGMP header (igmp), TCP header (tcp), UDP header (udp),
UDPLite header (udplite) or SCTP header (sctp).
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)iproute2 11 Jan 2015 Checksum action in tc(8)
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