Orange Pi5 kernel

/* SPDX-License-Identifier: GPL-2.0 */
#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[];
};
 
struct mld2_report {
<------>struct icmp6hdr		mld2r_hdr;
<------>struct mld2_grec	mld2r_grec[];
};
 
#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[];
};
 
#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)
 
#define MLD_EXP_MIN_LIMIT	32768UL
#define MLDV1_MRD_MAX_COMPAT	(MLD_EXP_MIN_LIMIT - 1)
 
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 < MLD_EXP_MIN_LIMIT) {
<------><------>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