Add a chroot dir for the _rtadvd user.
Drop privs to the user _rtadvd after acquiring our socket.
When rc.d/rtadvd starts or reloads, the rtadvd config file is copied
into the chroot before starting or reloading rtadvd itself.
Create a symlink from /var/run/rtadvd.dump to the chroot
Inital idea from OpenBSD patch rtadvd.c r1.36
Add support for SIGHUP to re-read the configuration for each interface.
If an invalid configuration is found, we continue to use the old one;
otherwise we expire the current one and then start advertising the new one.
Specififed interfaces don't have to exist at startup.
If specified interfaces arrive, load their config and start advertising.
If they depart, remove their rainfo structure and continue.
Fixes PR/43881 and PR/47311
RFC4191
- supports host-side router-preference
RFC3542
- if DAD fails on a interface, disables IPv6 operation on the
interface
- don't advertise MLD report before DAD finishes
Others
- fixes integer overflow for valid and preferred lifetimes
- improves timer granularity for MLD, using callout-timer.
- reflects rtadvd's IPv6 host variable information into kernel
(router only)
- adds a sysctl option to enable/disable pMTUd for multicast
packets
- performs NUD on PPP/GRE interface by default
- Redirect works regardless of ip6_accept_rtadv
- removes RFC1885-related code
From the KAME project via SUZUKI Shinsuke.
Reviewed by core.
- decrease warning level on missing rtadvd.conf (actually, the file
can be omitted)
- strict prototype
- gather stats better, emit stats on SIGUSR1 to /var/run
