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l2_packet: Fix bridge workaround for repeater configuration

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In repeater configuration, both AP and STA wireless interfaces may be
included into the same bridge. In this case the following race condition
may occur: wpa_supplicant and hostapd are started, then hostapd clients
are connected before wpa_supplicant connects to remote AP. EAPOL packets
between hostapd and its clients are detected by wpa_supplicant on bridge
interface, prematurely disabling the workaround.

One possible option to fix this issue is to check EAPOL destination MAC
in wpa_supplicant and disable workaround only if EAPOL packet on bridge
interface is indeed intended for wpa_supplicant.

Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
This commit is contained in:
Sergey Matyukevich 2019-10-16 10:44:49 +00:00 committed by Jouni Malinen
parent 9f47fdb6c3
commit 3626e72c8d
1 changed files with 4 additions and 1 deletions
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5
src/l2_packet/l2_packet_linux.c
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@ -171,13 +171,16 @@ static void l2_packet_receive(int sock, void *eloop_ctx, void *sock_ctx)
u8 hash[SHA1_MAC_LEN];
const u8 *addr[1];
size_t len[1];
const struct l2_ethhdr *eth = (const struct l2_ethhdr *) buf;
/*
* Close the workaround socket if the kernel version seems to be
* able to deliver packets through the packet socket before
* authorization has been completed (in dormant state).
*/
if (l2->num_rx_br <= 1) {
if (l2->num_rx_br <= 1 &&
(os_memcmp(eth->h_dest, l2->own_addr, ETH_ALEN) == 0 ||
is_multicast_ether_addr(eth->h_dest))) {
wpa_printf(MSG_DEBUG,
"l2_packet_receive: Main packet socket for %s seems to have working RX - close workaround bridge socket",
l2->ifname);