projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 6e7cb837 YH |
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 | ||
| 89225d1c DB |
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 | ||
| e3f5b170 DB |
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 | ||
| 6e7cb837 | 110 | #endif |