IPv6 Core Protocols Implementation

3.8 Processing Hop-by-Hop Options Header: ip6_hopopts_input() Function

The ip6_hopopts_input() function, shown below, is a subroutine of ip6_input() that processes the Hop-by-Hop options header if it is included in the incoming packet. In fact, this function only performs minimal validation and simply calls the ip6_process_hopopts() function described in the succeeding subsection.

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1367-1371 The first call to the IP6_EXTHDR_CHECK() macro ensures that the first mbuf contains enough data to refer to the length field of the Hop-by-Hop ...