Module util 

Byte-order helpers, checksum computation, error types.

Enums

BuildError

Error returned by packet builders when construction fails.

Traits

PacketBuilder

Common interface for all packet builders.

Functions

internet_checksum

Compute the 16-bit ones’ complement of the ones’ complement sum of data.

pseudo_header_checksum

Compute the TCP/UDP pseudo-header checksum.

read_u16be

Read a big-endian u16 from a 2-byte slice. Caller guarantees buf.len() >= 2.

read_u32be

Read a big-endian u32 from a 4-byte slice. Caller guarantees buf.len() >= 4.

seal_internet_checksum

Zero the 2-byte checksum field at csum_offset, compute the internet checksum over buf, and write the result back.

seal_transport_checksum

Zero the 2-byte checksum field at csum_offset, compute the TCP/UDP pseudo-header checksum over buf, and write the result back.

write_u16be

Write a big-endian u16 into a 2-byte slice. Caller guarantees buf.len() >= 2.

write_u32be

Write a big-endian u32 into a 4-byte slice. Caller guarantees buf.len() >= 4.