From: Michael Braun <michael-dev@xxxxxxxxxxxxx>
To receive pre-authentication packets on a non-wifi-client-data bridge,
the bssid needs to appear as local mac.
This is implemented by creating an interface of type "macvlan" with the
mac address configured as bssid.
Signed-off-by: Michael Braun <michael-dev@xxxxxxxxxxxxx>
---
hostapd/Makefile | 4 ++++
hostapd/defconfig | 3 +++
hostapd/hostapd.conf | 4 ++++
src/ap/preauth_auth.c | 35 +++++++++++++++++++++++++++++++++--
4 files changed, 44 insertions(+), 2 deletions(-)
diff --git a/hostapd/Makefile b/hostapd/Makefile
index 47ba052..1d6872b 100644
--- a/hostapd/Makefile
+++ b/hostapd/Makefile
@@ -260,6 +260,10 @@ endif
ifdef CONFIG_RSN_PREAUTH
CFLAGS += -DCONFIG_RSN_PREAUTH
CONFIG_L2_PACKET=y
+ifdef CONFIG_RSN_PREAUTH_MACVLAN
+CFLAGS += -DCONFIG_RSN_PREAUTH_MACVLAN
+NEED_MACVLAN=y
+endif
endif
ifdef CONFIG_PEERKEY
diff --git a/hostapd/defconfig b/hostapd/defconfig
index db35e0b..193546f 100644
--- a/hostapd/defconfig
+++ b/hostapd/defconfig
@@ -52,6 +52,9 @@ CONFIG_IAPP=y
# WPA2/IEEE 802.11i RSN pre-authentication
CONFIG_RSN_PREAUTH=y
+# see hostapd.conf
+# CONFIG_RSN_PREAUTH_MACVLAN=y
+
# PeerKey handshake for Station to Station Link (IEEE 802.11e DLS)
CONFIG_PEERKEY=y
diff --git a/hostapd/hostapd.conf b/hostapd/hostapd.conf
index 62bac5a..da0fb42 100644
--- a/hostapd/hostapd.conf
+++ b/hostapd/hostapd.conf
@@ -1209,6 +1209,10 @@ own_ip_addr=127.0.0.1
# associated stations (e.g., wlan0) should not be added, since
# pre-authentication is only used with APs other than the currently associated
# one.
+# Packets addressed to the local bssid need to appear as "local" to
+# rsn_preauth_interfaces in order to be received.
+# If hostapd is build with CONFIG_RSN_PREAUTH_MACVLAN, hostapd will add an
+# macvlan type interface using the bssid as mac.
#rsn_preauth_interfaces=eth0
# peerkey: Whether PeerKey negotiation for direct links (IEEE 802.11e) is
diff --git a/src/ap/preauth_auth.c b/src/ap/preauth_auth.c
index 3e0c800..d83b5f3 100644
--- a/src/ap/preauth_auth.c
+++ b/src/ap/preauth_auth.c
@@ -22,6 +22,10 @@
#include "sta_info.h"
#include "wpa_auth.h"
#include "preauth_auth.h"
+#if CONFIG_RSN_PREAUTH_MACVLAN
+#include "macvlan.h"
+#include "vlan_ifconfig.h"
+#endif /* CONFIG_RSN_PREAUTH_MACVLAN */
#ifndef ETH_P_PREAUTH
#define ETH_P_PREAUTH 0x88C7 /* IEEE 802.11i pre-authentication */
@@ -35,6 +39,9 @@ struct rsn_preauth_interface {
struct l2_packet_data *l2;
char *ifname;
int ifindex;
+#if CONFIG_RSN_PREAUTH_MACVLAN
+ int is_macvlan;
+#endif /* CONFIG_RSN_PREAUTH_MACVLAN */
};
@@ -94,9 +101,13 @@ static void rsn_preauth_receive(void *ctx, const u8 *src_addr,
}
-static int rsn_preauth_iface_add(struct hostapd_data *hapd, const char *ifname)
+static int rsn_preauth_iface_add(struct hostapd_data *hapd, const char *ifname,
+ int idx)
{
struct rsn_preauth_interface *piface;
+#ifdef CONFIG_RSN_PREAUTH_MACVLAN
+ char macvlan_iface[IFNAMSIZ+1];
+#endif /* CONFIG_RSN_PREAUTH_MACVLAN */
wpa_printf(MSG_DEBUG, "RSN pre-auth interface '%s'", ifname);
@@ -105,6 +116,19 @@ static int rsn_preauth_iface_add(struct hostapd_data *hapd, const char *ifname)
return -1;
piface->hapd = hapd;
+#ifdef CONFIG_RSN_PREAUTH_MACVLAN
+ snprintf(macvlan_iface, sizeof(macvlan_iface), "pre%d%s",
+ idx, hapd->conf->iface);
+ if (macvlan_add(macvlan_iface, hapd->own_addr, ifname) < 0 ||
+ ifconfig_up(macvlan_iface) < 0) {
+ wpa_printf(MSG_ERROR, "Failed to add bssid to "
+ "rsn_preauth_interface %s", ifname);
+ } else {
+ piface->is_macvlan = 1;
+ ifname = macvlan_iface;
+ }
+#endif /* CONFIG_RSN_PREAUTH_MACVLAN */
+
piface->ifname = os_strdup(ifname);
if (piface->ifname == NULL) {
goto fail1;
@@ -139,6 +163,12 @@ void rsn_preauth_iface_deinit(struct hostapd_data *hapd)
while (piface) {
prev = piface;
piface = piface->next;
+#ifdef CONFIG_RSN_PREAUTH_MACVLAN
+ if (prev->is_macvlan) {
+ ifconfig_down(prev->ifname);
+ macvlan_del(prev->ifname);
+ }
+#endif /* CONFIG_RSN_PREAUTH_MACVLAN */
l2_packet_deinit(prev->l2);
os_free(prev->ifname);
os_free(prev);
@@ -149,6 +179,7 @@ void rsn_preauth_iface_deinit(struct hostapd_data *hapd)
int rsn_preauth_iface_init(struct hostapd_data *hapd)
{
char *tmp, *start, *end;
+ int i = 0;
if (hapd->conf->rsn_preauth_interfaces == NULL)
return 0;
@@ -166,7 +197,7 @@ int rsn_preauth_iface_init(struct hostapd_data *hapd)
if (end)
*end = '\0';
- if (rsn_preauth_iface_add(hapd, start)) {
+ if (rsn_preauth_iface_add(hapd, start, i++)) {
rsn_preauth_iface_deinit(hapd);
os_free(tmp);
return -1;
--
2.1.4
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