igmp.h

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/*
 *  Linux NET3: Internet Group Management Protocol  [IGMP]
 *
 *  Authors:
 *      Alan Cox <[email protected]>
 *
 *  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 _UAPI_LINUX_IGMP_H
#define _UAPI_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 0x12 */
#define IGMP_HOST_LEAVE_MESSAGE     0x17
#define IGMPV3_HOST_MEMBERSHIP_REPORT   0x22    /* V3 version of 0x12 */

#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 /* _UAPI_LINUX_IGMP_H */