sctp: Check if there is any other connection with the ASP ident

When we get an ASP UP check if there is any other ASP that is
using the same identifier and then complain.

1 files changed, 15 insertions, 0 deletions

diff --git a/src/sctp_m2ua.c b/src/sctp_m2ua.c
index cdcf8cf..862c701 100644
--- a/src/sctp_m2ua.c
+++ b/src/sctp_m2ua.c
@@ -151,6 +151,8 @@ static int m2ua_handle_asp_ack(struct sctp_m2ua_conn *conn,
 			       struct m2ua_msg *m2ua,
 			       struct sctp_sndrcvinfo *info)
 {
+	struct sctp_m2ua_transport *trans = conn->trans;
+	struct sctp_m2ua_conn *tmp;
 	struct m2ua_msg_part *asp_ident;
 	struct m2ua_msg *ack;
 
@@ -181,6 +183,19 @@ static int m2ua_handle_asp_ack(struct sctp_m2ua_conn *conn,
 	memcpy(conn->asp_ident, asp_ident->dat, 4);
 	conn->asp_up = 1;
 
+	/* some verification about the ASPs */
+	llist_for_each_entry(tmp, &trans->conns, entry) {
+		if (tmp != conn)
+			continue;
+		if (memcmp(tmp->asp_ident, conn->asp_ident, 4) != 0)
+			continue;
+		LOGP(DINP, LOGL_ERROR,
+		     "Two active SCTP conns with %d.%d.%d.%d on %p, %p\n",
+		     conn->asp_ident[0], conn->asp_ident[1],
+		     conn->asp_ident[2], conn->asp_ident[3],
+		     tmp, conn);
+	}
+
 	m2ua_msg_free(ack);
 	return 0;
 }