projects / mirror_frr.git / blame
| Commit | Line | Data |
|---|---|---|
| 5e5034b0 DL |
1 | /* |
| 2 | * MLD protocol definitions | |
| 3 | * Copyright (C) 2022 David Lamparter for NetDEF, Inc. | |
| 4 | * | |
| 5 | * This program is free software; you can redistribute it and/or modify it | |
| 6 | * under the terms of the GNU General Public License as published by the Free | |
| 7 | * Software Foundation; either version 2 of the License, or (at your option) | |
| 8 | * any later version. | |
| 9 | * | |
| 10 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 13 | * more details. | |
| 14 | * | |
| 15 | * You should have received a copy of the GNU General Public License along | |
| 16 | * with this program; see the file COPYING; if not, write to the Free Software | |
| 17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
| 18 | */ | |
| 19 | ||
| 20 | #ifndef _PIM6_MLD_PROTOCOL_H | |
| 21 | #define _PIM6_MLD_PROTOCOL_H | |
| 22 | ||
| 23 | #include <stdalign.h> | |
| 24 | #include <stdint.h> | |
| 25 | ||
| 26 | /* There is a struct icmp6_hdr provided by OS, but it includes 4 bytes of data. | |
| 27 | * Not helpful for us if we want to put the MLD struct after it. | |
| 28 | */ | |
| 29 | ||
| 30 | struct icmp6_plain_hdr { | |
| 31 | uint8_t icmp6_type; | |
| 32 | uint8_t icmp6_code; | |
| 33 | uint16_t icmp6_cksum; | |
| 34 | }; | |
| 35 | static_assert(sizeof(struct icmp6_plain_hdr) == 4, "struct mismatch"); | |
| 36 | static_assert(alignof(struct icmp6_plain_hdr) <= 4, "struct mismatch"); | |
| 37 | ||
| 38 | /* for MLDv1 query, report and leave all use the same packet format */ | |
| 39 | struct mld_v1_pkt { | |
| 40 | uint16_t max_resp_code; | |
| 41 | uint16_t rsvd0; | |
| 42 | struct in6_addr grp; | |
| 43 | }; | |
| 44 | static_assert(sizeof(struct mld_v1_pkt) == 20, "struct mismatch"); | |
| 45 | static_assert(alignof(struct mld_v1_pkt) <= 4, "struct mismatch"); | |
| 46 | ||
| 47 | ||
| 48 | struct mld_v2_query_hdr { | |
| 49 | uint16_t max_resp_code; | |
| 50 | uint16_t rsvd0; | |
| 51 | struct in6_addr grp; | |
| 52 | uint8_t flags; | |
| 53 | uint8_t qqic; | |
| 54 | uint16_t n_src; | |
| 55 | struct in6_addr srcs[0]; | |
| 56 | }; | |
| 57 | static_assert(sizeof(struct mld_v2_query_hdr) == 24, "struct mismatch"); | |
| 58 | static_assert(alignof(struct mld_v2_query_hdr) <= 4, "struct mismatch"); | |
| 59 | ||
| 60 | ||
| 61 | struct mld_v2_report_hdr { | |
| 62 | uint16_t rsvd; | |
| 63 | uint16_t n_records; | |
| 64 | }; | |
| 65 | static_assert(sizeof(struct mld_v2_report_hdr) == 4, "struct mismatch"); | |
| 66 | static_assert(alignof(struct mld_v2_report_hdr) <= 4, "struct mismatch"); | |
| 67 | ||
| 68 | ||
| 69 | struct mld_v2_rec_hdr { | |
| 70 | uint8_t type; | |
| 71 | uint8_t aux_len; | |
| 72 | uint16_t n_src; | |
| 73 | struct in6_addr grp; | |
| 74 | struct in6_addr srcs[0]; | |
| 75 | }; | |
| 76 | static_assert(sizeof(struct mld_v2_rec_hdr) == 20, "struct mismatch"); | |
| 77 | static_assert(alignof(struct mld_v2_rec_hdr) <= 4, "struct mismatch"); | |
| 78 | ||
| 79 | /* clang-format off */ | |
| 80 | enum icmp6_mld_type { | |
| 81 | ICMP6_MLD_QUERY = 130, | |
| 82 | ICMP6_MLD_V1_REPORT = 131, | |
| 83 | ICMP6_MLD_V1_DONE = 132, | |
| 84 | ICMP6_MLD_V2_REPORT = 143, | |
| 85 | }; | |
| 86 | ||
| 87 | enum mld_v2_rec_type { | |
| 88 | MLD_RECTYPE_IS_INCLUDE = 1, | |
| 89 | MLD_RECTYPE_IS_EXCLUDE = 2, | |
| 90 | MLD_RECTYPE_CHANGE_TO_INCLUDE = 3, | |
| 91 | MLD_RECTYPE_CHANGE_TO_EXCLUDE = 4, | |
| 92 | MLD_RECTYPE_ALLOW_NEW_SOURCES = 5, | |
| 93 | MLD_RECTYPE_BLOCK_OLD_SOURCES = 6, | |
| 94 | }; | |
| 95 | /* clang-format on */ | |
| 96 | ||
| 97 | /* helper functions */ | |
| 98 | ||
| 99 | static inline unsigned int mld_max_resp_decode(uint16_t wire) | |
| 100 | { | |
| 101 | uint16_t code = ntohs(wire); | |
| 102 | uint8_t exp; | |
| 103 | ||
| 104 | if (code < 0x8000) | |
| 105 | return code; | |
| 106 | exp = (code >> 12) & 0x7; | |
| 107 | return ((code & 0xfff) | 0x1000) << (exp + 3); | |
| 108 | } | |
| 109 | ||
| 110 | static inline uint16_t mld_max_resp_encode(uint32_t value) | |
| 111 | { | |
| 112 | uint16_t code; | |
| 113 | uint8_t exp; | |
| 114 | ||
| 115 | if (value < 0x8000) | |
| 116 | code = value; | |
| 117 | else { | |
| 118 | exp = 16 - __builtin_clz(value); | |
| 119 | code = (value >> (exp + 3)) & 0xfff; | |
| 120 | code |= 0x8000 | (exp << 12); | |
| 121 | } | |
| 122 | return htons(code); | |
| 123 | } | |
| 124 | ||
| 125 | #endif /* _PIM6_MLD_PROTOCOL_H */ |