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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 | static inline unsigned long mldv2_mrc(const struct mld2_query *mlh2) |
92 | { |
93 | /* RFC3810, 5.1.3. Maximum Response Code */ |
94 | unsigned long ret, mc_mrc = ntohs(mlh2->mld2q_mrc); |
95 | |
96 | if (mc_mrc < 32768) { |
97 | ret = mc_mrc; |
98 | } else { |
99 | unsigned long mc_man, mc_exp; |
100 | |
101 | mc_exp = MLDV2_MRC_EXP(mc_mrc); |
102 | mc_man = MLDV2_MRC_MAN(mc_mrc); |
103 | |
104 | ret = (mc_man | 0x1000) << (mc_exp + 3); |
105 | } |
106 | |
107 | return ret; |
108 | } |
109 | |
110 | #endif |
111 |
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