fix: connection problem with clients having nomru option

Fixed problem while connecting with clients in which mru not
negotiating lcp option is set

accel-pppd/ppp/lcp_opt_mru.c

@@ -27,6 +27,7 @@ static int mru_send_conf_nak(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, ui
 static int mru_recv_conf_req(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr);
 static int mru_recv_conf_ack(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr);
 static int mru_recv_conf_nak(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr);
+static int mru_recv_conf_rej(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr);
 static void mru_print(void (*print)(const char *fmt, ...), struct lcp_option_t*, uint8_t *ptr);
 
 struct mru_option_t
@@ -35,6 +36,7 @@ struct mru_option_t
 	int mru;
 	int mtu;
 	int naked:1;
+	int rejected:1;
 };
 
 static struct lcp_option_handler_t mru_opt_hnd=
@@ -45,6 +47,7 @@ static struct lcp_option_handler_t mru_opt_hnd=
 	.recv_conf_req = mru_recv_conf_req,
 	.recv_conf_ack = mru_recv_conf_ack,
 	.recv_conf_nak = mru_recv_conf_nak,
+	.recv_conf_rej = mru_recv_conf_rej,
 	.free = mru_free,
 	.print = mru_print,
 };
@@ -81,7 +84,7 @@ static int mru_send_conf_req(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, ui
 	struct mru_option_t *mru_opt = container_of(opt, typeof(*mru_opt), opt);
 	struct lcp_opt16_t *opt16 = (struct lcp_opt16_t*)ptr;
 
-	if (mru_opt->naked)
+	if (mru_opt->naked || mru_opt->rejected)
 		return 0;
 
 	opt16->hdr.id = CI_MRU;
@@ -141,6 +144,13 @@ static int mru_recv_conf_nak(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, ui
 	mru_opt->naked = 1;
 	return 0;
 }
+static int mru_recv_conf_rej(struct ppp_lcp_t *lcp, struct lcp_option_t *opt, uint8_t *ptr)
+{
+	struct mru_option_t *mru_opt = container_of(opt, typeof(*mru_opt), opt);
+
+	mru_opt->rejected = 1;
+	return 0;
+}
 
 static void mru_print(void (*print)(const char *fmt, ...), struct lcp_option_t *opt, uint8_t *ptr)
 {