|
 |
41389a |
From 290834df69556b903b49f2a45671cc62b44f13bb Mon Sep 17 00:00:00 2001
|
|
|
41389a |
From: Beniamino Galvani <bgalvani@redhat.com>
|
|
|
41389a |
Date: Fri, 28 Apr 2017 17:59:30 +0200
|
|
|
41389a |
Subject: [PATCH] nl80211: Fix race condition in detecting MAC change
|
|
|
41389a |
|
|
|
41389a |
Commit 3e0272ca00ce1df35b45e7d739dd7e935f13fd84 ('nl80211: Re-read MAC
|
|
|
41389a |
address on RTM_NEWLINK') added the detection of external changes to MAC
|
|
|
41389a |
address when the interface is brought up.
|
|
|
41389a |
|
|
|
41389a |
If the interface state is changed quickly enough, wpa_supplicant may
|
|
|
41389a |
receive the netlink message for the !IFF_UP event when the interface
|
|
|
41389a |
has already been brought up and would ignore the next netlink IFF_UP
|
|
|
41389a |
message, missing the MAC change.
|
|
|
41389a |
|
|
|
41389a |
Fix this by also reloading the MAC address when a !IFF_UP event is
|
|
|
41389a |
received with the interface up, because this implies that the
|
|
|
41389a |
interface went down and up again, possibly changing the address.
|
|
|
41389a |
|
|
|
41389a |
Signed-off-by: Beniamino Galvani <bgalvani@redhat.com>
|
|
|
41389a |
---
|
|
|
41389a |
src/drivers/driver_nl80211.c | 47 +++++++++++++++++++++++++-------------------
|
|
|
41389a |
1 file changed, 27 insertions(+), 20 deletions(-)
|
|
|
41389a |
|
|
|
41389a |
diff --git a/src/drivers/driver_nl80211.c b/src/drivers/driver_nl80211.c
|
|
|
41389a |
index af1cb84..24fad29 100644
|
|
|
41389a |
--- a/src/drivers/driver_nl80211.c
|
|
|
41389a |
+++ b/src/drivers/driver_nl80211.c
|
|
|
41389a |
@@ -933,6 +933,30 @@ nl80211_find_drv(struct nl80211_global *global, int idx, u8 *buf, size_t len)
|
|
|
41389a |
}
|
|
|
41389a |
|
|
|
41389a |
|
|
|
41389a |
+static void nl80211_refresh_mac(struct wpa_driver_nl80211_data *drv,
|
|
|
41389a |
+ int ifindex)
|
|
|
41389a |
+{
|
|
|
41389a |
+ struct i802_bss *bss;
|
|
|
41389a |
+ u8 addr[ETH_ALEN];
|
|
|
41389a |
+
|
|
|
41389a |
+ bss = get_bss_ifindex(drv, ifindex);
|
|
|
41389a |
+ if (bss &&
|
|
|
41389a |
+ linux_get_ifhwaddr(drv->global->ioctl_sock,
|
|
|
41389a |
+ bss->ifname, addr) < 0) {
|
|
|
41389a |
+ wpa_printf(MSG_DEBUG,
|
|
|
41389a |
+ "nl80211: %s: failed to re-read MAC address",
|
|
|
41389a |
+ bss->ifname);
|
|
|
41389a |
+ } else if (bss && os_memcmp(addr, bss->addr, ETH_ALEN) != 0) {
|
|
|
41389a |
+ wpa_printf(MSG_DEBUG,
|
|
|
41389a |
+ "nl80211: Own MAC address on ifindex %d (%s) changed from "
|
|
|
41389a |
+ MACSTR " to " MACSTR,
|
|
|
41389a |
+ ifindex, bss->ifname,
|
|
|
41389a |
+ MAC2STR(bss->addr), MAC2STR(addr));
|
|
|
41389a |
+ os_memcpy(bss->addr, addr, ETH_ALEN);
|
|
|
41389a |
+ }
|
|
|
41389a |
+}
|
|
|
41389a |
+
|
|
|
41389a |
+
|
|
|
41389a |
static void wpa_driver_nl80211_event_rtm_newlink(void *ctx,
|
|
|
41389a |
struct ifinfomsg *ifi,
|
|
|
41389a |
u8 *buf, size_t len)
|
|
|
41389a |
@@ -997,6 +1021,8 @@ static void wpa_driver_nl80211_event_rtm_newlink(void *ctx,
|
|
|
41389a |
namebuf[0] = '\0';
|
|
|
41389a |
if (if_indextoname(ifi->ifi_index, namebuf) &&
|
|
|
41389a |
linux_iface_up(drv->global->ioctl_sock, namebuf) > 0) {
|
|
|
41389a |
+ /* Re-read MAC address as it may have changed */
|
|
|
41389a |
+ nl80211_refresh_mac(drv, ifi->ifi_index);
|
|
|
41389a |
wpa_printf(MSG_DEBUG, "nl80211: Ignore interface down "
|
|
|
41389a |
"event since interface %s is up", namebuf);
|
|
|
41389a |
drv->ignore_if_down_event = 0;
|
|
|
41389a |
@@ -1044,27 +1070,8 @@ static void wpa_driver_nl80211_event_rtm_newlink(void *ctx,
|
|
|
41389a |
"event since interface %s is marked "
|
|
|
41389a |
"removed", drv->first_bss->ifname);
|
|
|
41389a |
} else {
|
|
|
41389a |
- struct i802_bss *bss;
|
|
|
41389a |
- u8 addr[ETH_ALEN];
|
|
|
41389a |
-
|
|
|
41389a |
/* Re-read MAC address as it may have changed */
|
|
|
41389a |
- bss = get_bss_ifindex(drv, ifi->ifi_index);
|
|
|
41389a |
- if (bss &&
|
|
|
41389a |
- linux_get_ifhwaddr(drv->global->ioctl_sock,
|
|
|
41389a |
- bss->ifname, addr) < 0) {
|
|
|
41389a |
- wpa_printf(MSG_DEBUG,
|
|
|
41389a |
- "nl80211: %s: failed to re-read MAC address",
|
|
|
41389a |
- bss->ifname);
|
|
|
41389a |
- } else if (bss &&
|
|
|
41389a |
- os_memcmp(addr, bss->addr, ETH_ALEN) != 0) {
|
|
|
41389a |
- wpa_printf(MSG_DEBUG,
|
|
|
41389a |
- "nl80211: Own MAC address on ifindex %d (%s) changed from "
|
|
|
41389a |
- MACSTR " to " MACSTR,
|
|
|
41389a |
- ifi->ifi_index, bss->ifname,
|
|
|
41389a |
- MAC2STR(bss->addr),
|
|
|
41389a |
- MAC2STR(addr));
|
|
|
41389a |
- os_memcpy(bss->addr, addr, ETH_ALEN);
|
|
|
41389a |
- }
|
|
|
41389a |
+ nl80211_refresh_mac(drv, ifi->ifi_index);
|
|
|
41389a |
|
|
|
41389a |
wpa_printf(MSG_DEBUG, "nl80211: Interface up");
|
|
|
41389a |
drv->if_disabled = 0;
|
|
|
41389a |
--
|
|
|
41389a |
2.9.3
|
|
|
41389a |
|