Git Repo - linux.git/blame - include/net/mld.h

Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
6e7cb837 YH	2	#ifndef LINUX_MLD_H
	3	#define LINUX_MLD_H
	4
	5	#include <linux/in6.h>
	6	#include <linux/icmpv6.h>
	7
	8	/* MLDv1 Query/Report/Done */
	9	struct mld_msg {
	10	struct icmp6hdr mld_hdr;
	11	struct in6_addr mld_mca;
	12	};
	13
	14	#define mld_type mld_hdr.icmp6_type
	15	#define mld_code mld_hdr.icmp6_code
	16	#define mld_cksum mld_hdr.icmp6_cksum
	17	#define mld_maxdelay mld_hdr.icmp6_maxdelay
	18	#define mld_reserved mld_hdr.icmp6_dataun.un_data16[1]
	19
	20	/* Multicast Listener Discovery version 2 headers */
	21	/* MLDv2 Report */
	22	struct mld2_grec {
	23	__u8 grec_type;
	24	__u8 grec_auxwords;
	25	__be16 grec_nsrcs;
	26	struct in6_addr grec_mca;
c61a2a76	27	struct in6_addr grec_src[];
6e7cb837 YH	28	};
	29
	30	struct mld2_report {
	31	struct icmp6hdr mld2r_hdr;
c61a2a76	32	struct mld2_grec mld2r_grec[];
6e7cb837 YH	33	};
	34
	35	#define mld2r_type mld2r_hdr.icmp6_type
	36	#define mld2r_resv1 mld2r_hdr.icmp6_code
	37	#define mld2r_cksum mld2r_hdr.icmp6_cksum
	38	#define mld2r_resv2 mld2r_hdr.icmp6_dataun.un_data16[0]
	39	#define mld2r_ngrec mld2r_hdr.icmp6_dataun.un_data16[1]
	40
	41	/* MLDv2 Query */
	42	struct mld2_query {
	43	struct icmp6hdr mld2q_hdr;
	44	struct in6_addr mld2q_mca;
	45	#if defined(__LITTLE_ENDIAN_BITFIELD)
	46	__u8 mld2q_qrv:3,
	47	mld2q_suppress:1,
	48	mld2q_resv2:4;
	49	#elif defined(__BIG_ENDIAN_BITFIELD)
	50	__u8 mld2q_resv2:4,
	51	mld2q_suppress:1,
	52	mld2q_qrv:3;
	53	#else
	54	#error "Please fix <asm/byteorder.h>"
	55	#endif
	56	__u8 mld2q_qqic;
	57	__be16 mld2q_nsrcs;
c61a2a76	58	struct in6_addr mld2q_srcs[];
6e7cb837 YH	59	};
	60
	61	#define mld2q_type mld2q_hdr.icmp6_type
	62	#define mld2q_code mld2q_hdr.icmp6_code
	63	#define mld2q_cksum mld2q_hdr.icmp6_cksum
	64	#define mld2q_mrc mld2q_hdr.icmp6_maxdelay
	65	#define mld2q_resv1 mld2q_hdr.icmp6_dataun.un_data16[1]
	66
89225d1c DB	67	/* RFC3810, 5.1.3. Maximum Response Code:
	68	*
	69	* If Maximum Response Code >= 32768, Maximum Response Code represents a
	70	* floating-point value as follows:
	71	*
	72	* 0 1 2 3 4 5 6 7 8 9 A B C D E F
	73	* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	74	* \|1\| exp \| mant \|
	75	* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	76	*/
	77	#define MLDV2_MRC_EXP(value) (((value) >> 12) & 0x0007)
	78	#define MLDV2_MRC_MAN(value) ((value) & 0x0fff)
	79
	80	/* RFC3810, 5.1.9. QQIC (Querier's Query Interval Code):
	81	*
	82	* If QQIC >= 128, QQIC represents a floating-point value as follows:
	83	*
	84	* 0 1 2 3 4 5 6 7
	85	* +-+-+-+-+-+-+-+-+
	86	* \|1\| exp \| mant \|
	87	* +-+-+-+-+-+-+-+-+
	88	*/
	89	#define MLDV2_QQIC_EXP(value) (((value) >> 4) & 0x07)
	90	#define MLDV2_QQIC_MAN(value) ((value) & 0x0f)
	91
35f7aa53 DB	92	#define MLD_EXP_MIN_LIMIT 32768UL
	93	#define MLDV1_MRD_MAX_COMPAT (MLD_EXP_MIN_LIMIT - 1)
	94
f185de28 TY	95	#define MLD_MAX_QUEUE 8
	96	#define MLD_MAX_SKBS 32
	97
e3f5b170 DB	98	static inline unsigned long mldv2_mrc(const struct mld2_query *mlh2)
	99	{
	100	/* RFC3810, 5.1.3. Maximum Response Code */
	101	unsigned long ret, mc_mrc = ntohs(mlh2->mld2q_mrc);
	102
35f7aa53	103	if (mc_mrc < MLD_EXP_MIN_LIMIT) {
e3f5b170 DB	104	ret = mc_mrc;
	105	} else {
	106	unsigned long mc_man, mc_exp;
	107
	108	mc_exp = MLDV2_MRC_EXP(mc_mrc);
	109	mc_man = MLDV2_MRC_MAN(mc_mrc);
	110
	111	ret = (mc_man \| 0x1000) << (mc_exp + 3);
	112	}
	113
	114	return ret;
	115	}
	116
6e7cb837	117	#endif