checksum

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/* Don't change this without changing skb_csum_unnecessary! */
#define CHECKSUM_NONE 0
#define CHECKSUM_UNNECESSARY 1 ///hardware verified the checksums
#define CHECKSUM_COMPLETE 2
#define CHECKSUM_PARTIAL 3 ///only compute IP header, not include data

CHECKSUM_COMPLETE
表明网卡已经计算了L4层报头和payload的校验和，并且skb->csum已经被赋值，此时L4层的接收者只需要加伪头并验证校验结果