/*
 *        Linux NET3:        Internet Group Management Protocol  [IGMP]
 *
 *        Authors:
 *                Alan Cox <alan@lxorguk.ukuu.org.uk>
 *
 *        Extended to talk the BSD extended IGMP protocol of mrouted 3.6
 *
 *
 *        This program 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
 *        2 of the License, or (at your option) any later version.
 */

#ifndef _LINUX_IGMP_H
#define _LINUX_IGMP_H

#include <linux/types.h>
#include <asm/byteorder.h>

/*
 *        IGMP protocol structures
 */

/*
 *        Header in on cable format
 */

struct igmphdr
{
        __u8 type;
        __u8 code;                /* For newer IGMP */
        __sum16 csum;
        __be32 group;
};

/* V3 group record types [grec_type] */
#define IGMPV3_MODE_IS_INCLUDE                1
#define IGMPV3_MODE_IS_EXCLUDE                2
#define IGMPV3_CHANGE_TO_INCLUDE        3
#define IGMPV3_CHANGE_TO_EXCLUDE        4
#define IGMPV3_ALLOW_NEW_SOURCES        5
#define IGMPV3_BLOCK_OLD_SOURCES        6

struct igmpv3_grec {
        __u8        grec_type;
        __u8        grec_auxwords;
        __be16        grec_nsrcs;
        __be32        grec_mca;
        __be32        grec_src[0];
};

struct igmpv3_report {
        __u8 type;
        __u8 resv1;
        __be16 csum;
        __be16 resv2;
        __be16 ngrec;
        struct igmpv3_grec grec[0];
};

struct igmpv3_query {
        __u8 type;
        __u8 code;
        __be16 csum;
        __be32 group;
#if defined(__LITTLE_ENDIAN_BITFIELD)
        __u8 qrv:3,
             suppress:1,
             resv:4;
#elif defined(__BIG_ENDIAN_BITFIELD)
        __u8 resv:4,
             suppress:1,
             qrv:3;
#else
#error "Please fix <asm/byteorder.h>"
#endif
        __u8 qqic;
        __be16 nsrcs;
        __be32 srcs[0];
};

#define IGMP_HOST_MEMBERSHIP_QUERY        0x11        /* From RFC1112 */
#define IGMP_HOST_MEMBERSHIP_REPORT        0x12        /* Ditto */
#define IGMP_DVMRP                        0x13        /* DVMRP routing */
#define IGMP_PIM                        0x14        /* PIM routing */
#define IGMP_TRACE                        0x15
#define IGMPV2_HOST_MEMBERSHIP_REPORT        0x16        /* V2 version of 0x11 */
#define IGMP_HOST_LEAVE_MESSAGE         0x17
#define IGMPV3_HOST_MEMBERSHIP_REPORT        0x22        /* V3 version of 0x11 */

#define IGMP_MTRACE_RESP                0x1e
#define IGMP_MTRACE                        0x1f


/*
 *        Use the BSD names for these for compatibility
 */

#define IGMP_DELAYING_MEMBER                0x01
#define IGMP_IDLE_MEMBER                0x02
#define IGMP_LAZY_MEMBER                0x03
#define IGMP_SLEEPING_MEMBER                0x04
#define IGMP_AWAKENING_MEMBER                0x05

#define IGMP_MINLEN                        8

#define IGMP_MAX_HOST_REPORT_DELAY        10        /* max delay for response to */
                                                /* query (in seconds)        */

#define IGMP_TIMER_SCALE                10        /* denotes that the igmphdr->timer field */
                                                /* specifies time in 10th of seconds         */

#define IGMP_AGE_THRESHOLD                400        /* If this host don't hear any IGMP V1        */
                                                /* message in this period of time,        */
                                                /* revert to IGMP v2 router.                */

#define IGMP_ALL_HOSTS                htonl(0xE0000001L)
#define IGMP_ALL_ROUTER         htonl(0xE0000002L)
#define IGMPV3_ALL_MCR                 htonl(0xE0000016L)
#define IGMP_LOCAL_GROUP        htonl(0xE0000000L)
#define IGMP_LOCAL_GROUP_MASK        htonl(0xFFFFFF00L)

/*
 * struct for keeping the multicast list in
 */

#endif