From: Michael Lee <michael-cy.lee@xxxxxxxxxxxx>
If ioctl returns EBUSY on the command SIOCBRADDIF, the interface might
already be bridged by others (e.g. netifd in OpenWrt), and linux_br_add_if
should not indicate an error.
This patch checks whether the interface is correctly brigded when ioctl
returns EBUSY.
Signed-off-by: Michael-CY Lee <michael-cy.lee@xxxxxxxxxxxx>
---
src/drivers/linux_ioctl.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/src/drivers/linux_ioctl.c b/src/drivers/linux_ioctl.c
index 7edb9df..b606fac 100644
--- a/src/drivers/linux_ioctl.c
+++ b/src/drivers/linux_ioctl.c
@@ -151,6 +151,7 @@ int linux_br_add_if(int sock, const char *brname, const char *ifname)
{
struct ifreq ifr;
int ifindex;
+ char in_br[IFNAMSIZ];
ifindex = if_nametoindex(ifname);
if (ifindex == 0)
@@ -165,7 +166,14 @@ int linux_br_add_if(int sock, const char *brname, const char *ifname)
wpa_printf(MSG_DEBUG, "Could not add interface %s into bridge "
"%s: %s", ifname, brname, strerror(errno));
errno = saved_errno;
- return -1;
+
+ /* If ioctl returns EBUSY when adding interface into bridge,
+ * the interface might already be added by others, so checks
+ * whether the interface is currently on the right bridge.
+ */
+ if(errno != EBUSY || linux_br_get(in_br, ifname) != 0 ||
+ os_strcmp(in_br, brname) != 0)
+ return -1;
}
return 0;
--
2.25.1
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