[Bug 245181] Proxy ARP (net.link.ether.inet.proxyall) does not work for FIB other than 0

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245181

            Bug ID: 245181
           Summary: Proxy ARP (net.link.ether.inet.proxyall) does not work
                    for FIB other than 0
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: freebsd-bugzilla at thismonkey.com

Through troubleshooting and subsequent source code verification
(sys/netinet/if_ether.c) it appears that FreeBSD does not perform proxy ARP for
ARP requests whose target host reside in any FIB other than FIB 0.

Code at line 1073 indicates this:

/* XXX MRT use table 0 for arp checks */             
if (fib4_lookup_nh_basic(0, isaddr, 0, 0, &nh4) != 0)
        goto drop;                                   

This seems to be an incomplete implementation of the FIB functionality. 
FreeBSD should
1) lookup the FIB of the interface on which the ARP request arrived
2) perform a route lookup of the target in correct FIB
3) perform sanity checks
4) proxy-reply to the ARP request accordingly

Without this, operations like dropping some cloned interfaces into a non-zero
FIB are futile.

Thanks.

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