/*
 * This file and its contents are supplied under the terms of the
 * Common Development and Distribution License ("CDDL"), version 1.0.
 * You may only use this file in accordance with the terms of version
 * 1.0 of the CDDL.
 *
 * A full copy of the text of the CDDL should have accompanied this
 * source.  A copy of the CDDL is also available via the Internet at
 * http://www.illumos.org/license/CDDL.
 */

/*
 * Copyright 2015 Joyent, Inc.  All rights reserved.
 */

/*
 * Decode VXLAN encapsulated packets.
 */

#include <sys/vxlan.h>
#include "snoop.h"

extern interpreter_fn_t interpret_ether;

int
interpret_vxlan(int flags, char *data, int fraglen)
{
        vxlan_hdr_t *vxlan = (vxlan_hdr_t *)data;
        uint32_t id, vxf;

        if (fraglen < sizeof (vxlan_hdr_t)) {
                if (flags & F_SUM)
                        (void) snprintf(get_sum_line(), MAXLINE,
                            "VXLAN RUNT");
                if (flags & F_DTAIL)
                        show_header("VXLAN RUNT:  ", "Short packet", fraglen);

                return (fraglen);
        }

        id = ntohl(vxlan->vxlan_id) >> VXLAN_ID_SHIFT;
        vxf = ntohl(vxlan->vxlan_flags);

        if (flags & F_SUM) {
                (void) snprintf(get_sum_line(), MAXLINE,
                    "VXLAN VNI=%d", id);
        }

        if (flags & F_DTAIL) {
                show_header("VXLAN:  ", "VXLAN Header", sizeof (vxlan_hdr_t));
                show_space();
                (void) snprintf(get_line(0, 0), get_line_remain(),
                    "Flags = 0x%08x", vxf);
                (void) snprintf(get_line(0, 0), get_line_remain(), "      %s",
                    getflag(vxf >> 24, VXLAN_F_VDI >> 24, "vni present",
                    "vni missing"));
                (void) snprintf(get_line(0, 0), get_line_remain(),
                    "VXLAN network id (VNI) = %d", id);
                show_space();
        }

        if (flags & (F_DTAIL | F_ALLSUM)) {
                fraglen -= sizeof (vxlan_hdr_t);
                data += sizeof (vxlan_hdr_t);

                return (interpret_ether(flags, data, fraglen, fraglen));
        }

        return (0);
}