I think I may have tracked this down, but I haven't had a go at patching
it yet.
In net/netfilter/ipvs/ip_vs_core.c - in handle_response():
/* mangle the packet */
if (pp->snat_handler && !pp->snat_handler(skb, pp, cp, iph))
goto drop;
This calls the protocol-specific SNAT handler - however, it doesn't
first check that (IP_VS_FWD_METHOD(cp) == IP_VS_CONN_F_MASQ), as is done
in a couple of the other netfilter modules.
I think this means SNAT is *always* done on response packets, even if
the connection information was for a non-NAT connection.
I'll update the issue once I've had a go at patching this.
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https://bugs.launchpad.net/bugs/1681847
Title:
IPVS incorrectly reverse-NATs traffic to LVS host
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