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+/**
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+ * @file udpgw_proto.h
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+ * @author Ambroz Bizjak <ambrop7@gmail.com>
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+ *
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+ * @section LICENSE
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+ *
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+ * This file is part of BadVPN.
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+ *
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+ * BadVPN is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2
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+ * as published by the Free Software Foundation.
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+ *
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+ * BadVPN is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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+ *
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+ * @section DESCRIPTION
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+ *
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+ * Protocol for forwarding UDP over TCP. Messages should be carried with PacketProto.
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+ */
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+
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+#ifndef BADVPN_PROTOCOL_UDPGW_PROTO_H
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+#define BADVPN_PROTOCOL_UDPGW_PROTO_H
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+
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+#include <stdint.h>
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+
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+#include <misc/bsize.h>
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+
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+#define UDPGW_CLIENT_FLAG_KEEPALIVE (1 << 0)
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+#define UDPGW_CLIENT_FLAG_REBIND (1 << 1)
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+
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+struct udpgw_header {
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+ uint8_t flags;
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+ uint16_t conid;
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+ uint32_t addr_ip;
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+ uint16_t addr_port;
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+} __attribute__((packed));
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+
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+static int udpgw_compute_mtu (int dgram_mtu)
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+{
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+ bsize_t bs = bsize_add(
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+ bsize_fromsize(sizeof(struct udpgw_header)),
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+ bsize_fromint(dgram_mtu)
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+ );
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+
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+ int s;
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+ if (!bsize_toint(bs, &s)) {
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+ return -1;
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+ }
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+
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+ return s;
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+}
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+
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+#endif
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ambrop7