[SCTP]: correct the number of INIT retransmissions

We currently count the initial INIT/COOKIE_ECHO chunk toward the
retransmit count and thus sends a total of sctp_max_retrans_init chunks.
The correct behavior is to retransmit the chunk sctp_max_retrans_init in
addition to sending the original.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/sm_statefuns.c

@@ -2122,7 +2122,7 @@ static sctp_disposition_t sctp_sf_do_5_2_6_stale(const struct sctp_endpoint *ep,
 	struct sctp_bind_addr *bp;
 	int attempts = asoc->init_err_counter + 1;
 
-	if (attempts >= asoc->max_init_attempts) {
+	if (attempts > asoc->max_init_attempts) {
 		sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED,
 				SCTP_U32(SCTP_ERROR_STALE_COOKIE));
 		return SCTP_DISPOSITION_DELETE_TCB;
@@ -4640,7 +4640,7 @@ sctp_disposition_t sctp_sf_t1_init_timer_expire(const struct sctp_endpoint *ep,
 
 	SCTP_DEBUG_PRINTK("Timer T1 expired (INIT).\n");
 
-	if (attempts < asoc->max_init_attempts) {
+	if (attempts <= asoc->max_init_attempts) {
 		bp = (struct sctp_bind_addr *) &asoc->base.bind_addr;
 		repl = sctp_make_init(asoc, bp, GFP_ATOMIC, 0);
 		if (!repl)
@@ -4697,7 +4697,7 @@ sctp_disposition_t sctp_sf_t1_cookie_timer_expire(const struct sctp_endpoint *ep
 
 	SCTP_DEBUG_PRINTK("Timer T1 expired (COOKIE-ECHO).\n");
 
-	if (attempts < asoc->max_init_attempts) {
+	if (attempts <= asoc->max_init_attempts) {
 		repl = sctp_make_cookie_echo(asoc, NULL);
 		if (!repl)
 			return SCTP_DISPOSITION_NOMEM;

net/sctp/socket.c

@@ -5426,7 +5426,7 @@ out:
 	return err;
 
 do_error:
-	if (asoc->init_err_counter + 1 >= asoc->max_init_attempts)
+	if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
 		err = -ETIMEDOUT;
 	else
 		err = -ECONNREFUSED;