include/uapi/linux/igmp.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/igmp.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/igmp.h
Extension
.h
Size
3076 bytes
Lines
131
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

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[];
};

struct igmpv3_report {
	__u8 type;
	__u8 resv1;
	__sum16 csum;
	__be16 resv2;
	__be16 ngrec;
	struct igmpv3_grec grec[];
};

struct igmpv3_query {
	__u8 type;
	__u8 code;
	__sum16 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[];
};

#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

#define IGMP_MRDISC_ADV			0x30	/* From RFC4286 */

/*
 *	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)

Annotation

Implementation Notes