On 30.01.2013 10:25, Gleb Smirnoff wrote:
Hello!
It looks to me that the only thing the sockaddr_inarp was
ever used for is to carry the SIN_PROXY flag.
The SIN_PROXY flag in its turn, meant install a "proxy only"
ARP entry. Such entry behaves as any "published" entry, but
doesn't modify the routing table of the host.
Please correct me, if I am wrong in the above ^^.
Proxy arp is used for ppp for example when the remote end is
given an IP address from a locally connected network. Usually
the IP address was obtained via DHCP. The ppp server then
installs a proxy ARP entry for this IP address to receive all
packets for it and forward them over the PPP link.
Now, once ARP and routing are somewhat divorced, the meaning
of "proxy only" is lost, because any entry doesn't affect routing
table.
We still need the proxy ARP functionality and semantics. The
routing table however isn't involved anymore as you've observed.
This allows us to cleanup usage of SIN_PROXY and after that
it appears that we don't need sockaddr_inarp at all. Attached patch
does that. I didn't notice any functionality regressions, and I'd be
grateful if anyone points me at a test case, that would.
P.S. More reading on the history can be found here:
http://www.freebsd.org/cgi/query-pr.cgi?pr=12357
Excellent. More cruft going away.
--
Andre
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