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hostapd: nl80211 retry creating a interface if it fails the first time

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If hostapd segfaults, or is killed with -9, or the interface already exists,
when the interface is created, it will fail.

Configuration file: /tmp/hostapd/hostapd.conf
Failed to create interface mon.wlan0_0.
Using interface wlan0_0 with hwaddr 00:13:01:01:08:0a and ssid 'IG_0405_LAN'
Failed to set beacon head/tail or DTIM period
Failed to create interface wlan0_1.

Try to remove the interface and re-create it before aborting.
This commit is contained in:
Karl Hiramoto 2009-05-29 21:48:19 +03:00 committed by Jouni Malinen
parent 8077a80042
commit a35187e71a
1 changed files with 27 additions and 5 deletions
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32
src/drivers/driver_nl80211.c
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@ -2468,9 +2468,10 @@ static void nl80211_remove_iface(struct wpa_driver_nl80211_data *drv,
}
static int nl80211_create_iface(struct wpa_driver_nl80211_data *drv,
const char *ifname, enum nl80211_iftype iftype,
const u8 *addr)
static int nl80211_create_iface_once(struct wpa_driver_nl80211_data *drv,
const char *ifname,
enum nl80211_iftype iftype,
const u8 *addr)
{
struct nl_msg *msg, *flags = NULL;
int ifidx;
@ -2506,8 +2507,8 @@ static int nl80211_create_iface(struct wpa_driver_nl80211_data *drv,
ret = send_and_recv_msgs(drv, msg, NULL, NULL);
if (ret) {
nla_put_failure:
wpa_printf(MSG_ERROR, "Failed to create interface %s.",
ifname);
wpa_printf(MSG_ERROR, "Failed to create interface %s: %d (%s)",
ifname, ret, strerror(-ret));
return ret;
}
@ -2529,6 +2530,27 @@ static int nl80211_create_iface(struct wpa_driver_nl80211_data *drv,
return ifidx;
}
static int nl80211_create_iface(struct wpa_driver_nl80211_data *drv,
const char *ifname, enum nl80211_iftype iftype,
const u8 *addr)
{
int ret;
ret = nl80211_create_iface_once(drv, ifname, iftype, addr);
/* if error occured and interface exists already */
if (ret == -ENFILE && if_nametoindex(ifname)) {
wpa_printf(MSG_INFO, "Try to remove and re-create %s", ifname);
/* Try to remove the interface that was already there. */
nl80211_remove_iface(drv, if_nametoindex(ifname));
/* Try to create the interface again */
ret = nl80211_create_iface_once(drv, ifname, iftype, addr);
}
return ret;
}
#endif /* CONFIG_AP || HOSTAPD */