https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227243
Bug ID: 227243
Summary: getaddrinfo(3): IPv4-only jail on IPv4+6 host gets
ipv6 inaddr_any
Product: Base System
Version: 11.1-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: freebsd-bugs@FreeBSD.org
Reporter: p...@freebsd.org
On 11.1-RELEASE-p4 amd64.
The host has both IPv4 and IPv6 addresses configured.
The jail has only an IPv4 address configured.
getaddrinfo(3) with a NULL argument an AI_PASSIVE returns IPv6 address ("::")
which cannot used to establish a listen socket because there are no IPv6
addresses in the jail.
As far as I can tell, this happens because IPv6 is before IPv4 in afdl[] and
explore_null() is not smart enough to spot it is in an IPv4-only jail.
I'm not sure if this should be fixed in getaddrinfo.c or in the kernel (to make
socket(2) fail in IPv6 in IPv4 only jails).
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