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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 | ||
e3f5b170 DB |
95 | static inline unsigned long mldv2_mrc(const struct mld2_query *mlh2) |
96 | { | |
97 | /* RFC3810, 5.1.3. Maximum Response Code */ | |
98 | unsigned long ret, mc_mrc = ntohs(mlh2->mld2q_mrc); | |
99 | ||
35f7aa53 | 100 | if (mc_mrc < MLD_EXP_MIN_LIMIT) { |
e3f5b170 DB |
101 | ret = mc_mrc; |
102 | } else { | |
103 | unsigned long mc_man, mc_exp; | |
104 | ||
105 | mc_exp = MLDV2_MRC_EXP(mc_mrc); | |
106 | mc_man = MLDV2_MRC_MAN(mc_mrc); | |
107 | ||
108 | ret = (mc_man | 0x1000) << (mc_exp + 3); | |
109 | } | |
110 | ||
111 | return ret; | |
112 | } | |
113 | ||
6e7cb837 | 114 | #endif |