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