K 10
svn:author
V 2
kp
K 8
svn:date
V 27
2021-11-29T15:00:16.912545Z
K 7
svn:log
V 858
if_gif: fix vnet shutdown panic

If an if_gif exists and has an address assigned inside a vnet when the
vnet is shut down we failed to clean up the address, leading to a panic
when we ip_destroy() and the V_in_ifaddrhashtbl is not empty.

This happens because of the VNET_SYS(UN)INIT order, which means we
destroy the if_gif interface before the addresses can be purged (and
if_detach() does not remove addresses, it assumes this will be done by
the stack teardown code).

Set subsystem SI_SUB_PSEUDO just like if_bridge so the cleanup
operations happen in the correct order.

MFC after:	3 weeks
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D32835

(cherry picked from commit 8ca6c11a7cf834721c03cbe1a1aab0a17bae4d4d)

Git Hash:   b4a51fd9c12493e9e7ca6e2ac572ec41d99a941c
Git Author: kp@FreeBSD.org
END