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114 lines
2.8 KiB
114 lines
2.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef LINUX_MLD_H |
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#define LINUX_MLD_H |
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#include <linux/in6.h> |
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#include <linux/icmpv6.h> |
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/* MLDv1 Query/Report/Done */ |
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struct mld_msg { |
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struct icmp6hdr mld_hdr; |
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struct in6_addr mld_mca; |
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}; |
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#define mld_type mld_hdr.icmp6_type |
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#define mld_code mld_hdr.icmp6_code |
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#define mld_cksum mld_hdr.icmp6_cksum |
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#define mld_maxdelay mld_hdr.icmp6_maxdelay |
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#define mld_reserved mld_hdr.icmp6_dataun.un_data16[1] |
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/* Multicast Listener Discovery version 2 headers */ |
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/* MLDv2 Report */ |
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struct mld2_grec { |
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__u8 grec_type; |
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__u8 grec_auxwords; |
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__be16 grec_nsrcs; |
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struct in6_addr grec_mca; |
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struct in6_addr grec_src[]; |
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}; |
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struct mld2_report { |
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struct icmp6hdr mld2r_hdr; |
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struct mld2_grec mld2r_grec[]; |
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}; |
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#define mld2r_type mld2r_hdr.icmp6_type |
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#define mld2r_resv1 mld2r_hdr.icmp6_code |
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#define mld2r_cksum mld2r_hdr.icmp6_cksum |
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#define mld2r_resv2 mld2r_hdr.icmp6_dataun.un_data16[0] |
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#define mld2r_ngrec mld2r_hdr.icmp6_dataun.un_data16[1] |
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/* MLDv2 Query */ |
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struct mld2_query { |
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struct icmp6hdr mld2q_hdr; |
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struct in6_addr mld2q_mca; |
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#if defined(__LITTLE_ENDIAN_BITFIELD) |
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__u8 mld2q_qrv:3, |
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mld2q_suppress:1, |
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mld2q_resv2:4; |
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#elif defined(__BIG_ENDIAN_BITFIELD) |
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__u8 mld2q_resv2:4, |
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mld2q_suppress:1, |
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mld2q_qrv:3; |
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#else |
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#error "Please fix <asm/byteorder.h>" |
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#endif |
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__u8 mld2q_qqic; |
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__be16 mld2q_nsrcs; |
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struct in6_addr mld2q_srcs[]; |
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}; |
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#define mld2q_type mld2q_hdr.icmp6_type |
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#define mld2q_code mld2q_hdr.icmp6_code |
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#define mld2q_cksum mld2q_hdr.icmp6_cksum |
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#define mld2q_mrc mld2q_hdr.icmp6_maxdelay |
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#define mld2q_resv1 mld2q_hdr.icmp6_dataun.un_data16[1] |
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/* RFC3810, 5.1.3. Maximum Response Code: |
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* |
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* If Maximum Response Code >= 32768, Maximum Response Code represents a |
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* floating-point value as follows: |
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* |
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* 0 1 2 3 4 5 6 7 8 9 A B C D E F |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* |1| exp | mant | |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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*/ |
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#define MLDV2_MRC_EXP(value) (((value) >> 12) & 0x0007) |
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#define MLDV2_MRC_MAN(value) ((value) & 0x0fff) |
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/* RFC3810, 5.1.9. QQIC (Querier's Query Interval Code): |
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* |
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* If QQIC >= 128, QQIC represents a floating-point value as follows: |
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* |
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* 0 1 2 3 4 5 6 7 |
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* +-+-+-+-+-+-+-+-+ |
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* |1| exp | mant | |
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* +-+-+-+-+-+-+-+-+ |
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*/ |
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#define MLDV2_QQIC_EXP(value) (((value) >> 4) & 0x07) |
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#define MLDV2_QQIC_MAN(value) ((value) & 0x0f) |
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#define MLD_EXP_MIN_LIMIT 32768UL |
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#define MLDV1_MRD_MAX_COMPAT (MLD_EXP_MIN_LIMIT - 1) |
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static inline unsigned long mldv2_mrc(const struct mld2_query *mlh2) |
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{ |
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/* RFC3810, 5.1.3. Maximum Response Code */ |
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unsigned long ret, mc_mrc = ntohs(mlh2->mld2q_mrc); |
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if (mc_mrc < MLD_EXP_MIN_LIMIT) { |
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ret = mc_mrc; |
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} else { |
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unsigned long mc_man, mc_exp; |
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mc_exp = MLDV2_MRC_EXP(mc_mrc); |
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mc_man = MLDV2_MRC_MAN(mc_mrc); |
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ret = (mc_man | 0x1000) << (mc_exp + 3); |
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} |
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return ret; |
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} |
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#endif
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