[Backport v3.7-branch] net: ip: igmp: Fix IGMP determination #79969
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The header length of the net ip packet was calculated using only the net_pkt_ip_hdr_len function. The correct header length should be calculated by adding net_pkt_ip_hdr_len and net_pkt_ipv4_opts_len. This resulted in an incorrect IGMP version type in case of IGMPv2 message (when IGMPv3 was enabled). The IGMP message was not parsed correctly and therefore dropped. Signed-off-by: Ibe Van de Veire <ibe.vandeveire@basalte.be> (cherry picked from commit f852c12)
According to RFC2236 section 2.5, the IGMP message may be longer then 8 bytes. The rest of the bytes should be ignored. Signed-off-by: Ibe Van de Veire <ibe.vandeveire@basalte.be> (cherry picked from commit c646dd3)
Add igmp.h file to declare definitions for IGMP that are not meant te be included by the application but can be used in e.g. tests. Signed-off-by: Ibe Van de Veire <ibe.vandeveire@basalte.be> (cherry picked from commit ba9eca3)
Added extra testcases for the IGMPv3 protocol. The IGMP driver is supposed to send an IGMPv3 report when joining a group. Signed-off-by: Ibe Van de Veire <ibe.vandeveire@basalte.be> (cherry picked from commit e6dd4cd)
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Backport e6dd4cd~4..e6dd4cd from #79789.
Fixes #79788