CVS commit: src/sys

["Roy Marples" <roy%netbsd.org@localhost>]

Module Name:    src
Committed By:   roy
Date:           Tue Nov 15 10:47:39 UTC 2022

Modified Files:
        src/sys/net: if_ethersubr.c
        src/sys/netinet: if_arp.c
        src/sys/sys: mbuf.h

Log Message:
arp: Validate ARP source hardware address matches Ethernet source

RFC 5227 section 1.1 states that for a DaD ARP probe the sender hardware
address must match the hardware address of the interface sending the
packet.

We can now verify this by checking the mbuf tag PACKET_TAG_ETHERNET_SRC.

This fixes an obsure issue where an old router was sending out bogus
ARP probes.

Thanks to Ryo Shimizu <ryo%nerv.org@localhost> for the re-implementation.


To generate a diff of this commit:
cvs rdiff -u -r1.322 -r1.323 src/sys/net/if_ethersubr.c
cvs rdiff -u -r1.310 -r1.311 src/sys/netinet/if_arp.c
cvs rdiff -u -r1.235 -r1.236 src/sys/sys/mbuf.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.