Remove in-kernel handling of Router Advertisements

This is much better handled by a user-land tool.
Proposed on tech-net here:
https://mail-index.netbsd.org/tech-net/2020/04/22/msg007766.html

Note

Remove in-kernel handling of Router Advertisements

This is much better handled by a user-land tool.
Proposed on tech-net here:
https://mail-index.netbsd.org/tech-net/2020/04/22/msg007766.html

Note that the ioctl SIOCGIFINFO_IN6 no longer sets flags. That now
needs to be done using the pre-existing SIOCSIFINFO_FLAGS ioctl.

Compat is fully provided where it makes sense, but trying to turn on
RA handling will obviously throw an error as it no longer exists.

Note that if you use IPv6 temporary addresses, this now needs to be
turned on in dhcpcd.conf(5) rather than in sysctl.conf(5).

show more ...

Reduce duplicate codes

Introduce net_common.sh that is to share common functions used in tests
for networking. This commit commonizes extract_new_packets. Other duplicate
codes will be moved to the

Reduce duplicate codes

Introduce net_common.sh that is to share common functions used in tests
for networking. This commit commonizes extract_new_packets. Other duplicate
codes will be moved to the file in further commits.

show more ...

Add tests for RA

From s-yamaguchi@IIJ (with some tweaks by me)

Add tests for NDP