---
title: MBUF_CSUM_PSEUDO_HDR
framework: Kernel
role: symbol
role_heading: Enumeration Case
platforms: [macOS 10.12+]
path: kernel/1644526-anonymous/mbuf_csum_pseudo_hdr
---

# MBUF_CSUM_PSEUDO_HDR

## Declaration

```occ
MBUF_CSUM_PSEUDO_HDR = 0x0800
```

## Discussion

Discussion If set, this indicates that the checksum value for MBUF_CSUM_DID_DATA includes the pseudo header value. If this is not set, the stack will calculate the pseudo header value and add that to the checksum. The value of this bit is only valid when MBUF_CSUM_DID_DATA is set.