cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mld.h (2918B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      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 */
      9struct 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 */
     22struct mld2_grec {
     23	__u8		grec_type;
     24	__u8		grec_auxwords;
     25	__be16		grec_nsrcs;
     26	struct in6_addr	grec_mca;
     27	struct in6_addr	grec_src[];
     28};
     29
     30struct mld2_report {
     31	struct icmp6hdr		mld2r_hdr;
     32	struct mld2_grec	mld2r_grec[];
     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 */
     42struct 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;
     58	struct in6_addr		mld2q_srcs[];
     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
     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
     92#define MLD_EXP_MIN_LIMIT	32768UL
     93#define MLDV1_MRD_MAX_COMPAT	(MLD_EXP_MIN_LIMIT - 1)
     94
     95#define MLD_MAX_QUEUE		8
     96#define MLD_MAX_SKBS		32
     97
     98static 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
    103	if (mc_mrc < MLD_EXP_MIN_LIMIT) {
    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
    117#endif