mka: Send MKPDUs forever if mode is PSK

Issue: When 2 peers are running MACsec in PSK mode with CA
established, if the interface goes down and comes up after
time > 10 seconds, CA does not get re-established.

Root cause: This is because retry_count of both the peers
would have reached MAX_RETRY_CNT and stays idle for other to
respond. This is clear deadlock situation where peer A waits
for MKA packets from peer B to wake up and vice-versa.

Fix: If MACsec is running in PSK mode, we should send MKPDUs
forever for every 2 seconds.

Signed-off-by: Badrish Adiga H R <badrish.adigahr@gmail.com>

src/pae/ieee802_1x_kay.c

@@ -2428,7 +2428,8 @@ static void ieee802_1x_participant_timer(void *eloop_ctx, void *timeout_ctx)
 		participant->new_sak = FALSE;
 	}
 
-	if (participant->retry_count < MAX_RETRY_CNT) {
+	if (participant->retry_count < MAX_RETRY_CNT ||
+	    participant->mode == PSK) {
 		ieee802_1x_participant_send_mkpdu(participant);
 		participant->retry_count++;
 	}
@@ -2828,7 +2829,7 @@ int ieee802_1x_kay_enable_new_info(struct ieee802_1x_kay *kay)
 	if (!principal)
 		return -1;
 
-	if (principal->retry_count < MAX_RETRY_CNT) {
+	if (principal->retry_count < MAX_RETRY_CNT || principal->mode == PSK) {
 		ieee802_1x_participant_send_mkpdu(principal);
 		principal->retry_count++;
 	}
@@ -3368,6 +3369,7 @@ ieee802_1x_kay_create_mka(struct ieee802_1x_kay *kay, struct mka_key_name *ckn,
 		participant->mka_life = MKA_LIFE_TIME / 1000 + time(NULL) +
 			usecs / 1000000;
 	}
+	participant->mode = mode;
 
 	return participant;
 

src/pae/ieee802_1x_kay_i.h

@@ -93,6 +93,7 @@ struct ieee802_1x_mka_participant {
 	Boolean active;
 	Boolean participant;
 	Boolean retain;
+	enum mka_created_mode mode;
 
 	enum { DEFAULT, DISABLED, ON_OPER_UP, ALWAYS } activate;