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[eapol] Limit number of EAPoL-Start packets transmitted per attempt 

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/1073/head
Michael Brown 2023-11-07 13:50:15 +00:00
parent 1bd01b761f
commit 595b1796f6
2 changed files with 13 additions and 0 deletions
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5
src/include/ipxe/eapol.h
View File

@ -42,11 +42,16 @@ struct eapol_supplicant {
struct eap_supplicant eap; struct eap_supplicant eap;
/** EAPoL-Start retransmission timer */ /** EAPoL-Start retransmission timer */
struct retry_timer timer; struct retry_timer timer;
/** EAPoL-Start transmission count */
unsigned int count;
}; };
/** Delay between EAPoL-Start packets */ /** Delay between EAPoL-Start packets */
#define EAPOL_START_INTERVAL ( 2 * TICKS_PER_SEC ) #define EAPOL_START_INTERVAL ( 2 * TICKS_PER_SEC )
/** Maximum number of EAPoL-Start packets to transmit */
#define EAPOL_START_COUNT 3
/** An EAPoL handler */ /** An EAPoL handler */
struct eapol_handler { struct eapol_handler {
/** Type */ /** Type */

8
src/net/eapol.c
View File

@ -167,6 +167,7 @@ static int eapol_eap_rx ( struct eapol_supplicant *supplicant,
/* Delay EAPoL-Start until after next expected packet */ /* Delay EAPoL-Start until after next expected packet */
DBGC ( netdev, "EAPOL %s deferring Start\n", netdev->name ); DBGC ( netdev, "EAPOL %s deferring Start\n", netdev->name );
start_timer_fixed ( &supplicant->timer, EAP_WAIT_TIMEOUT ); start_timer_fixed ( &supplicant->timer, EAP_WAIT_TIMEOUT );
supplicant->count = 0;
} }
drop: drop:
@ -250,6 +251,12 @@ static void eapol_expired ( struct retry_timer *timer, int fail __unused ) {
container_of ( timer, struct eapol_supplicant, timer ); container_of ( timer, struct eapol_supplicant, timer );
struct net_device *netdev = supplicant->eap.netdev; struct net_device *netdev = supplicant->eap.netdev;
/* Stop transmitting after maximum number of attempts */
if ( supplicant->count++ >= EAPOL_START_COUNT ) {
DBGC ( netdev, "EAPOL %s giving up\n", netdev->name );
return;
}
/* Schedule next transmission */ /* Schedule next transmission */
start_timer_fixed ( timer, EAPOL_START_INTERVAL ); start_timer_fixed ( timer, EAPOL_START_INTERVAL );
@ -317,6 +324,7 @@ static void eapol_notify ( struct net_device *netdev, void *priv ) {
/* Otherwise, start sending EAPoL-Start */ /* Otherwise, start sending EAPoL-Start */
start_timer_nodelay ( &supplicant->timer ); start_timer_nodelay ( &supplicant->timer );
supplicant->count = 0;
DBGC ( netdev, "EAPOL %s starting up\n", netdev->name ); DBGC ( netdev, "EAPOL %s starting up\n", netdev->name );
} }