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5e5034b0a2
Fresh ground-up MLD implementation with subscriber-tracking for MLDv2. Intended to be adapted for IPv4 and replace the IGMP implementation at a later point. Tested in ANVL, currently at 94/116. Some issues/TODOs are left in the code as CPP_NOTICE markers, but the code is very much good enough to proceed since otherwise we're blocked on overall PIM v6 progress. Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
126 lines
3.3 KiB
C
126 lines
3.3 KiB
C
/*
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* MLD protocol definitions
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* Copyright (C) 2022 David Lamparter for NetDEF, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _PIM6_MLD_PROTOCOL_H
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#define _PIM6_MLD_PROTOCOL_H
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#include <stdalign.h>
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#include <stdint.h>
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/* There is a struct icmp6_hdr provided by OS, but it includes 4 bytes of data.
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* Not helpful for us if we want to put the MLD struct after it.
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*/
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struct icmp6_plain_hdr {
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uint8_t icmp6_type;
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uint8_t icmp6_code;
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uint16_t icmp6_cksum;
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};
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static_assert(sizeof(struct icmp6_plain_hdr) == 4, "struct mismatch");
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static_assert(alignof(struct icmp6_plain_hdr) <= 4, "struct mismatch");
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/* for MLDv1 query, report and leave all use the same packet format */
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struct mld_v1_pkt {
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uint16_t max_resp_code;
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uint16_t rsvd0;
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struct in6_addr grp;
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};
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static_assert(sizeof(struct mld_v1_pkt) == 20, "struct mismatch");
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static_assert(alignof(struct mld_v1_pkt) <= 4, "struct mismatch");
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struct mld_v2_query_hdr {
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uint16_t max_resp_code;
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uint16_t rsvd0;
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struct in6_addr grp;
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uint8_t flags;
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uint8_t qqic;
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uint16_t n_src;
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struct in6_addr srcs[0];
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};
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static_assert(sizeof(struct mld_v2_query_hdr) == 24, "struct mismatch");
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static_assert(alignof(struct mld_v2_query_hdr) <= 4, "struct mismatch");
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struct mld_v2_report_hdr {
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uint16_t rsvd;
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uint16_t n_records;
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};
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static_assert(sizeof(struct mld_v2_report_hdr) == 4, "struct mismatch");
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static_assert(alignof(struct mld_v2_report_hdr) <= 4, "struct mismatch");
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struct mld_v2_rec_hdr {
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uint8_t type;
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uint8_t aux_len;
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uint16_t n_src;
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struct in6_addr grp;
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struct in6_addr srcs[0];
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};
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static_assert(sizeof(struct mld_v2_rec_hdr) == 20, "struct mismatch");
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static_assert(alignof(struct mld_v2_rec_hdr) <= 4, "struct mismatch");
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/* clang-format off */
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enum icmp6_mld_type {
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ICMP6_MLD_QUERY = 130,
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ICMP6_MLD_V1_REPORT = 131,
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ICMP6_MLD_V1_DONE = 132,
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ICMP6_MLD_V2_REPORT = 143,
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};
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enum mld_v2_rec_type {
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MLD_RECTYPE_IS_INCLUDE = 1,
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MLD_RECTYPE_IS_EXCLUDE = 2,
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MLD_RECTYPE_CHANGE_TO_INCLUDE = 3,
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MLD_RECTYPE_CHANGE_TO_EXCLUDE = 4,
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MLD_RECTYPE_ALLOW_NEW_SOURCES = 5,
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MLD_RECTYPE_BLOCK_OLD_SOURCES = 6,
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};
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/* clang-format on */
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/* helper functions */
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static inline unsigned int mld_max_resp_decode(uint16_t wire)
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{
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uint16_t code = ntohs(wire);
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uint8_t exp;
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if (code < 0x8000)
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return code;
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exp = (code >> 12) & 0x7;
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return ((code & 0xfff) | 0x1000) << (exp + 3);
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}
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static inline uint16_t mld_max_resp_encode(uint32_t value)
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{
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uint16_t code;
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uint8_t exp;
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if (value < 0x8000)
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code = value;
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else {
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exp = 16 - __builtin_clz(value);
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code = (value >> (exp + 3)) & 0xfff;
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code |= 0x8000 | (exp << 12);
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}
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return htons(code);
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}
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#endif /* _PIM6_MLD_PROTOCOL_H */
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