CVS log for src/tests/net/arp/t_dad.sh

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Default branch: MAIN

Pull up following revision(s) (requested by ozaki-r in ticket #1883):

	tests/net/arp/t_dad.sh: revision 1.16
	sys/netinet/in.c: revision 1.248
	tests/net/arp/t_arp.sh: revision 1.46
	sys/netinet/if_arp.c: revision 1.314

arp: fix the behavior on detecting an address duplication without IPv4 DAD

On receiving an ARP request that has the same source protocol address as
the own address, i.e., address duplication, the original behavior of
a kernel prior to supporing IPv4 DAD is to send an ARP reply.   It is
the same with a latest kernel with DAD enabled.  However, a latest
kernel without DAD sends back an GARP packet.  Restore the original
behavior.

inet: send GARP on link up if DAD is disabled

This behavior was accidentally removed at rev 1.233.

tests, arp: add tests of address duplications without DAD

tests, arp: add tests for GARP on link up

Pull up following revision(s) (requested by ozaki-r in ticket #812):

	tests/net/arp/t_dad.sh: revision 1.16
	sys/netinet/in.c: revision 1.248
	tests/net/arp/t_arp.sh: revision 1.46
	sys/netinet/if_arp.c: revision 1.314

arp: fix the behavior on detecting an address duplication without IPv4 DAD

On receiving an ARP request that has the same source protocol address as
the own address, i.e., address duplication, the original behavior of
a kernel prior to supporing IPv4 DAD is to send an ARP reply.   It is
the same with a latest kernel with DAD enabled.  However, a latest
kernel without DAD sends back an GARP packet.  Restore the original
behavior.

inet: send GARP on link up if DAD is disabled

This behavior was accidentally removed at rev 1.233.

tests, arp: add tests of address duplications without DAD

tests, arp: add tests for GARP on link up

tests, arp: add tests of address duplications without DAD

Sync with HEAD

Sync with HEAD

Improve test stability and output messages on failure

Improve test stability and output messages on failure

Sync with HEAD.  (Note that most of these changes are simply $NetBSD$
tag issues.)

Share rump_server start/stop and interface creation/destruction functions

The common functions store socks of rump_servers, interfaces of rump_servers
and buses that intefaces connect and allow to destroy them with common
functions without specifying which socks, interfaces and buses we should
destroy.

This change reduces lots of similar setup/cleanup codes.

Add missing bus argument for extract_new_packets

Move HIJACKING definition to net_common.sh

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.

Accept DEBUG environment variable

By doing so, we can easily turn DEBUG on/off without modifying
the ATF scripts.

Sync with HEAD

adjust for new ifconfig output.

+ -lrumpdev

Give a chance to send a DAD announce packet

ifconfig -w ensures IP addresses have left tentative state, however,
it doesn't guarantee that a DAD announce packet is sent. The kernel
clears tentative flag and then sends the packet so that ifconfig -w
can return before the kernel sends the packet.

Disable another tentative state check

It's too ephemeral to check robustly.

Improve test stability

- Take a diff between packet dumps and use it for packet checking
  - it's resistant against packet reorder
- Seep 2 sec to make sure a NS message is sent
- Disable tentative state check for now
  - it's too ephemeral to check robustly

Remove remaining debug code

Fix cleanup; halt all running rump_servers

Add tests for IPv4 DAD