Function Prototypes:tfPacketChecksum
Table of Contents >> Compile Time Macros
| tt16Bit tfPacketChecksum | ( |
| ttPacketPtr packetPtr, | |
| ttPktLen totalDataLength, | |
| tt16BitPtr pshHdrPtr, | |
| tt16Bit pshLen | |
| ); |
Function Description
This function calculates the checksum of (IP, ICMP, IGMP, UDP and TCP) packets. If the user has defined TM_USER_OCS or TM_CUSTOM_OCS in trsystem.h, then they must define an implementation of this function.
Parameters
- packetPtr
- Pointer to a ttPacket structure. packetPtr->pktLinkDataPtr points to the data to be checksummed.
- length
- Length of data to be checksummed.
- pshHdrPtr
- Pointer to the pseudo header.
- pshLen
- Length of the pseudo-header.
Returns
- tt16Bit
- The 16-bit one's complement checksum.
