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      1 /*
      2  *	Linux NET3:	Internet Group Management Protocol  [IGMP]
      3  *
      4  *	Authors:
      5  *		Alan Cox <Alan.Cox (at) linux.org>
      6  *
      7  *	Extended to talk the BSD extended IGMP protocol of mrouted 3.6
      8  *
      9  *
     10  *	This program is free software; you can redistribute it and/or
     11  *	modify it under the terms of the GNU General Public License
     12  *	as published by the Free Software Foundation; either version
     13  *	2 of the License, or (at your option) any later version.
     14  */
     15 
     16 #ifndef _LINUX_IGMP_H
     17 #define _LINUX_IGMP_H
     18 
     19 #include <asm/byteorder.h>
     20 
     21 /*
     22  *	IGMP protocol structures
     23  */
     24 
     25 /*
     26  *	Header in on cable format
     27  */
     28 
     29 struct igmphdr
     30 {
     31 	__u8 type;
     32 	__u8 code;		/* For newer IGMP */
     33 	__sum16 csum;
     34 	__be32 group;
     35 };
     36 
     37 /* V3 group record types [grec_type] */
     38 #define IGMPV3_MODE_IS_INCLUDE		1
     39 #define IGMPV3_MODE_IS_EXCLUDE		2
     40 #define IGMPV3_CHANGE_TO_INCLUDE	3
     41 #define IGMPV3_CHANGE_TO_EXCLUDE	4
     42 #define IGMPV3_ALLOW_NEW_SOURCES	5
     43 #define IGMPV3_BLOCK_OLD_SOURCES	6
     44 
     45 struct igmpv3_grec {
     46 	__u8	grec_type;
     47 	__u8	grec_auxwords;
     48 	__be16	grec_nsrcs;
     49 	__be32	grec_mca;
     50 	__be32	grec_src[0];
     51 };
     52 
     53 struct igmpv3_report {
     54 	__u8 type;
     55 	__u8 resv1;
     56 	__be16 csum;
     57 	__be16 resv2;
     58 	__be16 ngrec;
     59 	struct igmpv3_grec grec[0];
     60 };
     61 
     62 struct igmpv3_query {
     63 	__u8 type;
     64 	__u8 code;
     65 	__be16 csum;
     66 	__be32 group;
     67 #if defined(__LITTLE_ENDIAN_BITFIELD)
     68 	__u8 qrv:3,
     69 	     suppress:1,
     70 	     resv:4;
     71 #elif defined(__BIG_ENDIAN_BITFIELD)
     72 	__u8 resv:4,
     73 	     suppress:1,
     74 	     qrv:3;
     75 #else
     76 #error "Please fix <asm/byteorder.h>"
     77 #endif
     78 	__u8 qqic;
     79 	__be16 nsrcs;
     80 	__be32 srcs[0];
     81 };
     82 
     83 
     84 #define IGMP_HOST_MEMBERSHIP_QUERY	0x11	/* From RFC1112 */
     85 #define IGMP_HOST_MEMBERSHIP_REPORT	0x12	/* Ditto */
     86 #define IGMP_DVMRP			0x13	/* DVMRP routing */
     87 #define IGMP_PIM			0x14	/* PIM routing */
     88 #define IGMP_TRACE			0x15
     89 #define IGMPV2_HOST_MEMBERSHIP_REPORT	0x16	/* V2 version of 0x11 */
     90 #define IGMP_HOST_LEAVE_MESSAGE 	0x17
     91 #define IGMPV3_HOST_MEMBERSHIP_REPORT	0x22	/* V3 version of 0x11 */
     92 
     93 #define IGMP_MTRACE_RESP		0x1e
     94 #define IGMP_MTRACE			0x1f
     95 
     96 
     97 /*
     98  *	Use the BSD names for these for compatibility
     99  */
    100 
    101 #define IGMP_DELAYING_MEMBER		0x01
    102 #define IGMP_IDLE_MEMBER		0x02
    103 #define IGMP_LAZY_MEMBER		0x03
    104 #define IGMP_SLEEPING_MEMBER		0x04
    105 #define IGMP_AWAKENING_MEMBER		0x05
    106 
    107 #define IGMP_MINLEN			8
    108 
    109 #define IGMP_MAX_HOST_REPORT_DELAY	10	/* max delay for response to */
    110 						/* query (in seconds)	*/
    111 
    112 #define IGMP_TIMER_SCALE		10	/* denotes that the igmphdr->timer field */
    113 						/* specifies time in 10th of seconds	 */
    114 
    115 #define IGMP_AGE_THRESHOLD		400	/* If this host don't hear any IGMP V1	*/
    116 						/* message in this period of time,	*/
    117 						/* revert to IGMP v2 router.		*/
    118 
    119 #define IGMP_ALL_HOSTS		htonl(0xE0000001L)
    120 #define IGMP_ALL_ROUTER 	htonl(0xE0000002L)
    121 #define IGMPV3_ALL_MCR	 	htonl(0xE0000016L)
    122 #define IGMP_LOCAL_GROUP	htonl(0xE0000000L)
    123 #define IGMP_LOCAL_GROUP_MASK	htonl(0xFFFFFF00L)
    124 
    125 /*
    126  * struct for keeping the multicast list in
    127  */
    128 
    129 #endif
    130