From 23a958deec775a74d2ff9d0d31ef208c47516a4b Mon Sep 17 00:00:00 2001
From: Kozlov Dmitry <dima@server>
Date: Mon, 16 May 2011 18:04:28 +0400
Subject: ppp: better handling for lost last acknowledge packet

---
 accel-pppd/ppp/ppp_ipcp.c | 50 ++++++++++++++++++-----------------------------
 1 file changed, 19 insertions(+), 31 deletions(-)

(limited to 'accel-pppd/ppp/ppp_ipcp.c')

diff --git a/accel-pppd/ppp/ppp_ipcp.c b/accel-pppd/ppp/ppp_ipcp.c
index 8890f2c..72760d5 100644
--- a/accel-pppd/ppp/ppp_ipcp.c
+++ b/accel-pppd/ppp/ppp_ipcp.c
@@ -61,9 +61,6 @@ static void ipcp_options_free(struct ppp_ipcp_t *ipcp)
 		list_del(&lopt->entry);
 		lopt->h->free(ipcp, lopt);
 	}
-
-	if (ipcp->buf)
-		_free(ipcp->buf);
 }
 
 static struct ppp_layer_data_t *ipcp_layer_init(struct ppp_t *ppp)
@@ -226,10 +223,7 @@ static void send_conf_ack(struct ppp_fsm_t *fsm)
 	struct ipcp_hdr_t *hdr = (struct ipcp_hdr_t*)ipcp->ppp->buf;
 
 	if (ipcp->delay_ack) {
-		if (!ipcp->buf) {
-			ipcp->buf = _malloc(ntohs(hdr->len) + 2);
-			memcpy(ipcp->buf, ipcp->ppp->buf, ntohs(hdr->len) + 2);
-		}
+		send_term_ack(fsm);
 		return;
 	}
 
@@ -241,19 +235,6 @@ static void send_conf_ack(struct ppp_fsm_t *fsm)
 	ppp_unit_send(ipcp->ppp, hdr, ntohs(hdr->len) + 2);
 }
 
-void ipcp_send_ack(struct ppp_t *ppp)
-{
-	struct ppp_ipcp_t *ipcp = container_of(ppp_find_layer_data(ppp, &ipcp_layer), typeof(*ipcp), ld);
-	struct ipcp_hdr_t *hdr = (struct ipcp_hdr_t*)ipcp->buf;
-
-	hdr->code = CONFACK;
-
-	if (conf_ppp_verbose)
-		log_ppp_info2("send [IPCP ConfAck id=%x]\n", ipcp->fsm.recv_id);
-
-	ppp_unit_send(ipcp->ppp, hdr, ntohs(hdr->len) + 2);
-}
-
 static void send_conf_nak(struct ppp_fsm_t *fsm)
 {
 	struct ppp_ipcp_t *ipcp = container_of(fsm, typeof(*ipcp), fsm);
@@ -583,7 +564,7 @@ static void ipcp_recv(struct ppp_handler_t*h)
 	struct ppp_ipcp_t *ipcp = container_of(h, typeof(*ipcp), hnd);
 	int r;
 
-	if (ipcp->fsm.fsm_state == FSM_Initial || ipcp->fsm.fsm_state == FSM_Closed || ipcp->fsm.fsm_state == FSM_Opened || ipcp->ppp->terminating) {
+	if (ipcp->fsm.fsm_state == FSM_Initial || ipcp->fsm.fsm_state == FSM_Closed || ipcp->ppp->terminating) {
 		if (conf_ppp_verbose)
 			log_ppp_warn("IPCP: discarding packet\n");
 		return;
@@ -612,16 +593,23 @@ static void ipcp_recv(struct ppp_handler_t*h)
 				ipcp_free_conf_req(ipcp);
 				return;
 			}
-			switch(r) {
-				case IPCP_OPT_ACK:
-					ppp_fsm_recv_conf_req_ack(&ipcp->fsm);
-					break;
-				case IPCP_OPT_NAK:
-					ppp_fsm_recv_conf_req_nak(&ipcp->fsm);
-					break;
-				case IPCP_OPT_REJ:
-					ppp_fsm_recv_conf_req_rej(&ipcp->fsm);
-					break;
+			if (ipcp->started) {
+				if (r == IPCP_OPT_ACK)
+					send_conf_ack(&ipcp->fsm);
+				else
+					r = IPCP_OPT_FAIL;
+			} else {
+				switch(r) {
+					case IPCP_OPT_ACK:
+						ppp_fsm_recv_conf_req_ack(&ipcp->fsm);
+						break;
+					case IPCP_OPT_NAK:
+						ppp_fsm_recv_conf_req_nak(&ipcp->fsm);
+						break;
+					case IPCP_OPT_REJ:
+						ppp_fsm_recv_conf_req_rej(&ipcp->fsm);
+						break;
+				}
 			}
 			ipcp_free_conf_req(ipcp);
 			if (r == IPCP_OPT_FAIL)
-- 
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