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 */ |
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; |
27 | struct in6_addr grec_src[]; |
28 | }; |
29 | |
30 | struct 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 */ |
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; |
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 | |
98 | static 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 |
118 | |