3 files changed, 27 insertions, 3 deletions
diff --git a/accel-pptpd/ppp/ppp.c b/accel-pptpd/ppp/ppp.c
index 03a8db0..dbb6709 100644
--- a/accel-pptpd/ppp/ppp.c
+++ b/accel-pptpd/ppp/ppp.c
@@ -274,7 +274,8 @@ cont:
 			}
 		}
 
-		log_ppp_warn("ppp_chan_read: discarding unknown packet %x\n", proto);
+		lcp_send_proto_rej(ppp, proto);
+		//log_ppp_warn("ppp_chan_read: discarding unknown packet %x\n", proto);
 	}
 }
 
@@ -316,8 +317,8 @@ cont:
 				goto cont;
 			}
 		}
-
-		log_ppp_warn("ppp_unit_read: discarding unknown packet %x\n",proto);
+		lcp_send_proto_rej(ppp, proto);
+		//log_ppp_warn("ppp_unit_read: discarding unknown packet %x\n", proto);
 	}
 }
 
diff --git a/accel-pptpd/ppp/ppp.h b/accel-pptpd/ppp/ppp.h
index 32615c2..afc26a3 100644
--- a/accel-pptpd/ppp/ppp.h
+++ b/accel-pptpd/ppp/ppp.h
@@ -136,6 +136,7 @@ void ppp_init(struct ppp_t *ppp);
 int establish_ppp(struct ppp_t *ppp);
 int ppp_chan_send(struct ppp_t *ppp, void *data, int size);
 int ppp_unit_send(struct ppp_t *ppp, void *data, int size);
+void lcp_send_proto_rej(struct ppp_t *ppp, uint16_t proto);
 
 struct ppp_fsm_t* ppp_lcp_init(struct ppp_t *ppp);
 void ppp_layer_started(struct ppp_t *ppp,struct ppp_layer_data_t*);
diff --git a/accel-pptpd/ppp/ppp_lcp.c b/accel-pptpd/ppp/ppp_lcp.c
index 66d31da..c6415e9 100644
--- a/accel-pptpd/ppp/ppp_lcp.c
+++ b/accel-pptpd/ppp/ppp_lcp.c
@@ -26,6 +26,7 @@ static int conf_echo_interval = 0;
 static int conf_echo_failure = 3;
 
 static LIST_HEAD(option_handlers);
+static struct ppp_layer_t lcp_layer;
 
 static void lcp_layer_up(struct ppp_fsm_t*);
 static void lcp_layer_down(struct ppp_fsm_t*);
@@ -616,6 +617,27 @@ static void send_term_ack(struct ppp_fsm_t *fsm)
 	ppp_chan_send(lcp->ppp, &hdr, 6);
 }
 
+void lcp_send_proto_rej(struct ppp_t *ppp, uint16_t proto)
+{
+	struct ppp_lcp_t *lcp = container_of(ppp_find_layer_data(ppp, &lcp_layer), typeof(*lcp), ld);
+	struct rej_msg_t
+	{
+		struct lcp_hdr_t hdr;
+		uint16_t proto;
+	} __attribute__((packed)) msg = {
+		.hdr.proto = htons(PPP_LCP),
+		.hdr.code = PROTOREJ,
+		.hdr.id = ++lcp->fsm.id,
+		.hdr.len = htons(6),
+		.proto = proto,
+	};
+
+	log_ppp_debug("send [LCP ProtoRej id=%i <%x>]\n", msg.hdr.id, proto);
+
+	ppp_chan_send(lcp->ppp, &msg, sizeof(msg));
+}
+
+
 static void lcp_recv(struct ppp_handler_t*h)
 {
 	struct lcp_hdr_t *hdr;