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ifupdown: do not fail if interface disappears during ifdown

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Interface may not exist because it got deleted by an ifdown hook script
earlier. This may happen when a virtual interface, such as VLAN, has multiple
iface blocks defined.

function                                             old     new   delta
static_down6                                          14      40     +26
static_down                                           54      70     +16
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 42/0)               Total: 42 bytes

Signed-off-by: Kaarle Ritvanen <kaarle.ritvanen@datakunkku.fi>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Kaarle Ritvanen 2018-03-28 00:00:03 +02:00 committed by Denys Vlasenko
parent 46ba2468a3
commit 123fdda0a4
1 changed files with 6 additions and 0 deletions
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6
networking/ifupdown.c
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@ -138,6 +138,7 @@
//usage: "\n -v Print out what would happen before doing it"
//usage: "\n -f Force deconfiguration"
#include <net/if.h>
#include "libbb.h"
#include "common_bufsiz.h"
/* After libbb.h, since it needs sys/types.h on some systems */
@ -503,6 +504,8 @@ static int FAST_FUNC static_up6(struct interface_defn_t *ifd, execfn *exec)
static int FAST_FUNC static_down6(struct interface_defn_t *ifd, execfn *exec)
{
if (!if_nametoindex(ifd->iface))
return 1; /* already gone */
# if ENABLE_FEATURE_IFUPDOWN_IP
return execute("ip link set %iface% down", ifd, exec);
# else
@ -598,6 +601,9 @@ static int FAST_FUNC static_up(struct interface_defn_t *ifd, execfn *exec)
static int FAST_FUNC static_down(struct interface_defn_t *ifd, execfn *exec)
{
int result;
if (!if_nametoindex(ifd->iface))
return 2; /* already gone */
# if ENABLE_FEATURE_IFUPDOWN_IP
/* Optional "label LBL" is necessary if interface is an alias (eth0:0),
* otherwise "ip addr flush dev eth0:0" flushes all addresses on eth0.