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skb_checksum_complete(9) - phpMan

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SKB_CHECKSUM_COMPLET(9)                  Linux Networking                 SKB_CHECKSUM_COMPLET(9)

       skb_checksum_complete - Calculate checksum of an entire packet

       __sum16 skb_checksum_complete(struct sk_buff * skb);

           packet to process

       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.

Kernel Hackers Manual 4.8.                 January 2017                   SKB_CHECKSUM_COMPLET(9)

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