add netinet/igmp.h and multicast groups to netinet/in.h

based on patch by Timo Teräs.

include/netinet/igmp.h

+#ifndef _NETINET_IGMP_H
+#define _NETINET_IGMP_H
+
+#include <stdint.h>
+#include <netinet/in.h>
+
+struct igmp {
+	uint8_t igmp_type;
+	uint8_t igmp_code;
+	uint16_t igmp_cksum;
+	struct in_addr igmp_group;
+};
+
+#define IGMP_MINLEN			8
+
+#define IGMP_MEMBERSHIP_QUERY   	0x11
+#define IGMP_V1_MEMBERSHIP_REPORT	0x12
+#define IGMP_V2_MEMBERSHIP_REPORT	0x16
+#define IGMP_V2_LEAVE_GROUP		0x17
+
+#define IGMP_DVMRP			0x13
+#define IGMP_PIM			0x14
+#define IGMP_TRACE			0x15
+
+#define IGMP_MTRACE_RESP		0x1e
+#define IGMP_MTRACE			0x1f
+
+#define IGMP_MAX_HOST_REPORT_DELAY	10
+#define IGMP_TIMER_SCALE		10
+
+#define IGMP_DELAYING_MEMBER	1
+#define IGMP_IDLE_MEMBER	2
+#define IGMP_LAZY_MEMBER	3
+#define IGMP_SLEEPING_MEMBER	4
+#define IGMP_AWAKENING_MEMBER	5
+
+#define IGMP_v1_ROUTER		1
+#define IGMP_v2_ROUTER		2
+
+#define IGMP_HOST_MEMBERSHIP_QUERY	IGMP_MEMBERSHIP_QUERY
+#define IGMP_HOST_MEMBERSHIP_REPORT	IGMP_V1_MEMBERSHIP_REPORT
+#define IGMP_HOST_NEW_MEMBERSHIP_REPORT	IGMP_V2_MEMBERSHIP_REPORT
+#define IGMP_HOST_LEAVE_MESSAGE		IGMP_V2_LEAVE_GROUP
+
+#endif

include/netinet/in.h

@@ -53,6 +53,11 @@ struct ipv6_mreq
 #define INADDR_NONE       ((in_addr_t) 0xffffffff)
 #define INADDR_LOOPBACK   ((in_addr_t) 0x7f000001)
 
+#define INADDR_UNSPEC_GROUP     ((in_addr_t) 0xe0000000)
+#define INADDR_ALLHOSTS_GROUP   ((in_addr_t) 0xe0000001)
+#define INADDR_ALLRTRS_GROUP    ((in_addr_t) 0xe0000002)
+#define INADDR_MAX_LOCAL_GROUP  ((in_addr_t) 0xe00000ff)
+
 #define IN6ADDR_ANY_INIT      { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } }
 #define IN6ADDR_LOOPBACK_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } }