Added som docs and some messages.

FossilOrigin-Name: 023b3d3c1254cb814383d73b5f6dd36e983117b45675caa1626fc9fccfecbee9

src/cw/cw_in_mtu_discovery_padding.c

@@ -0,0 +1,41 @@
+/*
+    This file is part of libcapwap.
+
+    libcapwap is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    libcapwap is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with Foobar.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#include "cw.h"
+#include "dbg.h"
+
+
+int cw_in_mtu_discovery_padding(struct conn *conn, struct cw_action_in *a,
+				 uint8_t * data, int len,struct sockaddr *from)
+
+{
+	int i, n = 0;
+	for (i = 0; i < len; i++) {
+		if (data[i] != 0xff)
+			n++;
+	}
+	if (n){
+		cw_dbg(DBG_RFC,
+		       "MTU discovery padding msg elem contains %d non-0xFF byte(s) out of %d, See RFC 5415.",
+		       n, len);
+		if (conn->strict_capwap)
+			return 0;
+	}
+	return 1;
+}