Date: Thu, 01 Apr 2010 22:01:23 +0200 From: Pieter de Boer <pieter@thedarkside.nl> To: freebsd-net@freebsd.org Subject: ::1 magically replaced with other address (2) Message-ID: <4BB4FB93.8020108@thedarkside.nl>
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Hi folks,
A couple of days ago I sent a mail to this list detailing an issue I
have. To summarize: every once in a while my ::1 address on lo0 is
replaced with another ipv6-address that's configured on lo3 and used in
a child jail of a jail. I've been digging a bit through the FreeBSD
source code and found a possible spot where this may occur.
In the function in6_selectsrc() in /sys/netinet6/in6_src.c the following
code can be found:
TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
...
prison_local_ip6(cred, &ia->ia_addr.sin6_addr,
(inp != NULL &&
(inp->inp_flags & IN6P_IPV6_V6ONLY) != 0)) != 0)
continue;
...
}
prison_local_ip6() appears to replace a loopback address with a jail's
main address:
if (IN6_IS_ADDR_LOOPBACK(ia6)) {
bcopy(&pr->pr_ip6[0], ia6, sizeof(struct in6_addr));
...
The way I read this code is that it replaces the interface address 'ia'
when it is a loopback address with the prison's main address.
Can anyone with more clue about this code tell if I read this correctly
and possibly even help with fixing the problem if that is the case?
Thanks,
Pieter
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