projects / mirror_frr.git / blame
| Commit | Line | Data |
|---|---|---|
| acddc0ed | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 5e5034b0 DL |
2 | /* |
| 3 | * MLD protocol definitions | |
| 4 | * Copyright (C) 2022 David Lamparter for NetDEF, Inc. | |
| 5e5034b0 DL |
5 | */ |
| 6 | ||
| 7 | #ifndef _PIM6_MLD_PROTOCOL_H | |
| 8 | #define _PIM6_MLD_PROTOCOL_H | |
| 9 | ||
| 10 | #include <stdalign.h> | |
| 11 | #include <stdint.h> | |
| 12 | ||
| 13 | /* There is a struct icmp6_hdr provided by OS, but it includes 4 bytes of data. | |
| 14 | * Not helpful for us if we want to put the MLD struct after it. | |
| 15 | */ | |
| 16 | ||
| 17 | struct icmp6_plain_hdr { | |
| 18 | uint8_t icmp6_type; | |
| 19 | uint8_t icmp6_code; | |
| 20 | uint16_t icmp6_cksum; | |
| 21 | }; | |
| 22 | static_assert(sizeof(struct icmp6_plain_hdr) == 4, "struct mismatch"); | |
| 23 | static_assert(alignof(struct icmp6_plain_hdr) <= 4, "struct mismatch"); | |
| 24 | ||
| 25 | /* for MLDv1 query, report and leave all use the same packet format */ | |
| 26 | struct mld_v1_pkt { | |
| 27 | uint16_t max_resp_code; | |
| 28 | uint16_t rsvd0; | |
| 29 | struct in6_addr grp; | |
| 30 | }; | |
| 31 | static_assert(sizeof(struct mld_v1_pkt) == 20, "struct mismatch"); | |
| 32 | static_assert(alignof(struct mld_v1_pkt) <= 4, "struct mismatch"); | |
| 33 | ||
| 34 | ||
| 35 | struct mld_v2_query_hdr { | |
| 36 | uint16_t max_resp_code; | |
| 37 | uint16_t rsvd0; | |
| 38 | struct in6_addr grp; | |
| 39 | uint8_t flags; | |
| 40 | uint8_t qqic; | |
| 41 | uint16_t n_src; | |
| 42 | struct in6_addr srcs[0]; | |
| 43 | }; | |
| 44 | static_assert(sizeof(struct mld_v2_query_hdr) == 24, "struct mismatch"); | |
| 45 | static_assert(alignof(struct mld_v2_query_hdr) <= 4, "struct mismatch"); | |
| 46 | ||
| 47 | ||
| 48 | struct mld_v2_report_hdr { | |
| 49 | uint16_t rsvd; | |
| 50 | uint16_t n_records; | |
| 51 | }; | |
| 52 | static_assert(sizeof(struct mld_v2_report_hdr) == 4, "struct mismatch"); | |
| 53 | static_assert(alignof(struct mld_v2_report_hdr) <= 4, "struct mismatch"); | |
| 54 | ||
| 55 | ||
| 56 | struct mld_v2_rec_hdr { | |
| 57 | uint8_t type; | |
| 58 | uint8_t aux_len; | |
| 59 | uint16_t n_src; | |
| 60 | struct in6_addr grp; | |
| 61 | struct in6_addr srcs[0]; | |
| 62 | }; | |
| 63 | static_assert(sizeof(struct mld_v2_rec_hdr) == 20, "struct mismatch"); | |
| 64 | static_assert(alignof(struct mld_v2_rec_hdr) <= 4, "struct mismatch"); | |
| 65 | ||
| 66 | /* clang-format off */ | |
| 67 | enum icmp6_mld_type { | |
| 68 | ICMP6_MLD_QUERY = 130, | |
| 69 | ICMP6_MLD_V1_REPORT = 131, | |
| 70 | ICMP6_MLD_V1_DONE = 132, | |
| 71 | ICMP6_MLD_V2_REPORT = 143, | |
| 72 | }; | |
| 73 | ||
| 74 | enum mld_v2_rec_type { | |
| 75 | MLD_RECTYPE_IS_INCLUDE = 1, | |
| 76 | MLD_RECTYPE_IS_EXCLUDE = 2, | |
| 77 | MLD_RECTYPE_CHANGE_TO_INCLUDE = 3, | |
| 78 | MLD_RECTYPE_CHANGE_TO_EXCLUDE = 4, | |
| 79 | MLD_RECTYPE_ALLOW_NEW_SOURCES = 5, | |
| 80 | MLD_RECTYPE_BLOCK_OLD_SOURCES = 6, | |
| 81 | }; | |
| 82 | /* clang-format on */ | |
| 83 | ||
| 84 | /* helper functions */ | |
| 85 | ||
| 86 | static inline unsigned int mld_max_resp_decode(uint16_t wire) | |
| 87 | { | |
| 88 | uint16_t code = ntohs(wire); | |
| 89 | uint8_t exp; | |
| 90 | ||
| 91 | if (code < 0x8000) | |
| 92 | return code; | |
| 93 | exp = (code >> 12) & 0x7; | |
| 94 | return ((code & 0xfff) | 0x1000) << (exp + 3); | |
| 95 | } | |
| 96 | ||
| 97 | static inline uint16_t mld_max_resp_encode(uint32_t value) | |
| 98 | { | |
| 99 | uint16_t code; | |
| 100 | uint8_t exp; | |
| 101 | ||
| 102 | if (value < 0x8000) | |
| 103 | code = value; | |
| 104 | else { | |
| 105 | exp = 16 - __builtin_clz(value); | |
| 106 | code = (value >> (exp + 3)) & 0xfff; | |
| 107 | code |= 0x8000 | (exp << 12); | |
| 108 | } | |
| 109 | return htons(code); | |
| 110 | } | |
| 111 | ||
| 112 | #endif /* _PIM6_MLD_PROTOCOL_H */ |