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YOSHIFUJI Hideaki6e7cb832010-04-18 12:42:05 +09001#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 */
8struct 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 */
21struct 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
29struct 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 */
41struct 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
Daniel Borkmann89225d12013-09-04 00:19:37 +020066/* 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
Daniel Borkmanne3f5b172013-09-04 00:19:39 +020091static 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
YOSHIFUJI Hideaki6e7cb832010-04-18 12:42:05 +0900110#endif