#ifndef LINUX_MLD_H#define LINUX_MLD_H #include <linux/in6.h>#include <linux/icmpv6.h> /* MLDv1 Query/Report/Done */struct mld_msg {	struct icmp6hdr		mld_hdr;	struct in6_addr		mld_mca;}; #define mld_type		mld_hdr.icmp6_type#define mld_code		mld_hdr.icmp6_code#define mld_cksum		mld_hdr.icmp6_cksum#define mld_maxdelay		mld_hdr.icmp6_maxdelay#define mld_reserved		mld_hdr.icmp6_dataun.un_data16[1] /* Multicast Listener Discovery version 2 headers *//* MLDv2 Report */struct mld2_grec {	__u8		grec_type;	__u8		grec_auxwords;	__be16		grec_nsrcs;	struct in6_addr	grec_mca;	struct in6_addr	grec_src[0];}; struct mld2_report {	struct icmp6hdr		mld2r_hdr;	struct mld2_grec	mld2r_grec[0];}; #define mld2r_type		mld2r_hdr.icmp6_type#define mld2r_resv1		mld2r_hdr.icmp6_code#define mld2r_cksum		mld2r_hdr.icmp6_cksum#define mld2r_resv2		mld2r_hdr.icmp6_dataun.un_data16[0]#define mld2r_ngrec		mld2r_hdr.icmp6_dataun.un_data16[1] /* MLDv2 Query */struct mld2_query {	struct icmp6hdr		mld2q_hdr;	struct in6_addr		mld2q_mca;#if defined(__LITTLE_ENDIAN_BITFIELD)	__u8			mld2q_qrv:3,				mld2q_suppress:1,				mld2q_resv2:4;#elif defined(__BIG_ENDIAN_BITFIELD)	__u8			mld2q_resv2:4,				mld2q_suppress:1,				mld2q_qrv:3;#else#error "Please fix <asm/byteorder.h>"#endif	__u8			mld2q_qqic;	__be16			mld2q_nsrcs;	struct in6_addr		mld2q_srcs[0];}; #define mld2q_type		mld2q_hdr.icmp6_type#define mld2q_code		mld2q_hdr.icmp6_code#define mld2q_cksum		mld2q_hdr.icmp6_cksum#define mld2q_mrc		mld2q_hdr.icmp6_maxdelay#define mld2q_resv1		mld2q_hdr.icmp6_dataun.un_data16[1] /* RFC3810, 5.1.3. Maximum Response Code: * * If Maximum Response Code >= 32768, Maximum Response Code represents a * floating-point value as follows: * *  0 1 2 3 4 5 6 7 8 9 A B C D E F * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |1| exp |          mant         | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */#define MLDV2_MRC_EXP(value)	(((value) >> 12) & 0x0007)#define MLDV2_MRC_MAN(value)	((value) & 0x0fff) /* RFC3810, 5.1.9. QQIC (Querier's Query Interval Code): * * If QQIC >= 128, QQIC represents a floating-point value as follows: * *  0 1 2 3 4 5 6 7 * +-+-+-+-+-+-+-+-+ * |1| exp | mant  | * +-+-+-+-+-+-+-+-+ */#define MLDV2_QQIC_EXP(value)	(((value) >> 4) & 0x07)#define MLDV2_QQIC_MAN(value)	((value) & 0x0f) static inline unsigned long mldv2_mrc(const struct mld2_query *mlh2){	/* RFC3810, 5.1.3. Maximum Response Code */	unsigned long ret, mc_mrc = ntohs(mlh2->mld2q_mrc); 	if (mc_mrc < 32768) {		ret = mc_mrc;	} else {		unsigned long mc_man, mc_exp; 		mc_exp = MLDV2_MRC_EXP(mc_mrc);		mc_man = MLDV2_MRC_MAN(mc_mrc); 		ret = (mc_man | 0x1000) << (mc_exp + 3);	} 	return ret;} #endif