git: dc5361ea16bf - main - rc.d/netif: Don't DAD if lo0 is the only IPv6 IF

The branch main has been updated by cperciva:

URL: https://cgit.FreeBSD.org/src/commit/?id=dc5361ea16bf5bffab43823eb128f4081f0a5097

commit dc5361ea16bf5bffab43823eb128f4081f0a5097
Author:     Colin Percival <cperciva@FreeBSD.org>
AuthorDate: 2023-05-18 03:17:24 +0000
Commit:     Colin Percival <cperciva@FreeBSD.org>
CommitDate: 2023-05-18 15:20:15 +0000

    rc.d/netif: Don't DAD if lo0 is the only IPv6 IF
    
    The code in rc.d/netif waiting for IPv6 Duplicate Address Detection if
    any network interfaces support IPv6.  Unfortunately, since lo0 *always*
    has IPv6 enabled, this means unconditionally sleeping, even on systems
    which have no external IPv6 interfaces.
    
    Since we presume that there is little risk of a duplicate address being
    assigned on lo0, amend the test to wait only if there is an interface
    *other than lo0* which supports IPv6.
    
    Reviewed by:    bz
    Differential Revision:  https://reviews.freebsd.org/D40141
---
 libexec/rc/rc.d/netif | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libexec/rc/rc.d/netif b/libexec/rc/rc.d/netif
index 1a2fe0b73589..ba6b43917378 100755
--- a/libexec/rc/rc.d/netif
+++ b/libexec/rc/rc.d/netif
@@ -215,7 +215,7 @@ netif_common()
 		esac
 		if ${_func} ${ifn} $2; then
 			_ok="${_ok} ${ifn}"
-			if ipv6if ${ifn}; then
+			if ipv6if ${ifn} && [ "${ifn}" != "lo0" ]; then
 				_dadwait=1
 			fi
 		else