1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2009 Bruce Simpson. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote 15 * products derived from this software without specific prior written 16 * permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 #ifndef _NETINET6_MLD6_VAR_H_ 31 #define _NETINET6_MLD6_VAR_H_ 32 33 /* 34 * Multicast Listener Discovery (MLD) 35 * implementation-specific definitions. 36 */ 37 38 /* 39 * MLD per-group states. 40 */ 41 #define MLD_NOT_MEMBER 0 /* Can garbage collect group */ 42 #define MLD_SILENT_MEMBER 1 /* Do not perform MLD for group */ 43 #define MLD_REPORTING_MEMBER 2 /* MLDv1 we are reporter */ 44 #define MLD_IDLE_MEMBER 3 /* MLDv1 we reported last */ 45 #define MLD_LAZY_MEMBER 4 /* MLDv1 other member reporting */ 46 #define MLD_SLEEPING_MEMBER 5 /* MLDv1 start query response */ 47 #define MLD_AWAKENING_MEMBER 6 /* MLDv1 group timer will start */ 48 #define MLD_G_QUERY_PENDING_MEMBER 7 /* MLDv2 group query pending */ 49 #define MLD_SG_QUERY_PENDING_MEMBER 8 /* MLDv2 source query pending */ 50 #define MLD_LEAVING_MEMBER 9 /* MLDv2 dying gasp (pending last */ 51 /* retransmission of INCLUDE {}) */ 52 53 /* 54 * MLD version tag. 55 */ 56 #define MLD_VERSION_NONE 0 /* Invalid */ 57 #define MLD_VERSION_1 1 58 #define MLD_VERSION_2 2 /* Default */ 59 60 /* 61 * MLDv2 protocol control variables. 62 */ 63 #define MLD_RV_INIT 2 /* Robustness Variable */ 64 #define MLD_RV_MIN 1 65 #define MLD_RV_MAX 7 66 67 #define MLD_QI_INIT 125 /* Query Interval (s) */ 68 #define MLD_QI_MIN 1 69 #define MLD_QI_MAX 255 70 71 #define MLD_QRI_INIT 10 /* Query Response Interval (s) */ 72 #define MLD_QRI_MIN 1 73 #define MLD_QRI_MAX 255 74 75 #define MLD_URI_INIT 3 /* Unsolicited Report Interval (s) */ 76 #define MLD_URI_MIN 0 77 #define MLD_URI_MAX 10 78 79 #define MLD_MAX_GS_SOURCES 256 /* # of sources in rx GS query */ 80 #define MLD_MAX_G_GS_PACKETS 8 /* # of packets to answer G/GS */ 81 #define MLD_MAX_STATE_CHANGE_PACKETS 8 /* # of packets per state change */ 82 #define MLD_MAX_RESPONSE_PACKETS 16 /* # of packets for general query */ 83 #define MLD_MAX_RESPONSE_BURST 4 /* # of responses to send at once */ 84 #define MLD_RESPONSE_BURST_INTERVAL (MLD_FASTHZ / 2) /* 500ms */ 85 86 /* 87 * MLD-specific mbuf flags. 88 */ 89 #define M_MLDV1 M_PROTO1 /* Packet is MLDv1 */ 90 #define M_GROUPREC M_PROTO3 /* mbuf chain is a group record */ 91 92 /* 93 * Leading space for MLDv2 reports inside MTU. 94 * 95 * NOTE: This differs from IGMPv3 significantly. KAME IPv6 requires 96 * that a fully formed mbuf chain *without* the Router Alert option 97 * is passed to ip6_output(), however we must account for it in the 98 * MTU if we need to split an MLDv2 report into several packets. 99 * 100 * We now put the MLDv2 report header in the initial mbuf containing 101 * the IPv6 header. 102 */ 103 #define MLD_MTUSPACE (sizeof(struct ip6_hdr) + sizeof(struct mld_raopt) + \ 104 sizeof(struct icmp6_hdr)) 105 106 /* 107 * Structure returned by net.inet6.mld.ifinfo. 108 */ 109 struct mld_ifinfo { 110 uint32_t mli_version; /* MLDv1 Host Compatibility Mode */ 111 uint32_t mli_v1_timer; /* MLDv1 Querier Present timer (s) */ 112 uint32_t mli_v2_timer; /* MLDv2 General Query (interface) timer (s)*/ 113 uint32_t mli_flags; /* MLD per-interface flags */ 114 #define MLIF_SILENT 0x00000001 /* Do not use MLD on this ifp */ 115 #define MLIF_USEALLOW 0x00000002 /* Use ALLOW/BLOCK for joins/leaves */ 116 uint32_t mli_rv; /* MLDv2 Robustness Variable */ 117 uint32_t mli_qi; /* MLDv2 Query Interval (s) */ 118 uint32_t mli_qri; /* MLDv2 Query Response Interval (s) */ 119 uint32_t mli_uri; /* MLDv2 Unsolicited Report Interval (s) */ 120 }; 121 122 #ifdef _KERNEL 123 /* 124 * Per-link MLD state. 125 */ 126 struct mld_ifsoftc { 127 LIST_ENTRY(mld_ifsoftc) mli_link; 128 struct ifnet *mli_ifp; /* interface this instance belongs to */ 129 uint32_t mli_version; /* MLDv1 Host Compatibility Mode */ 130 uint32_t mli_v1_timer; /* MLDv1 Querier Present timer (s) */ 131 uint32_t mli_v2_timer; /* MLDv2 General Query (interface) timer (s)*/ 132 uint32_t mli_flags; /* MLD per-interface flags */ 133 uint32_t mli_rv; /* MLDv2 Robustness Variable */ 134 uint32_t mli_qi; /* MLDv2 Query Interval (s) */ 135 uint32_t mli_qri; /* MLDv2 Query Response Interval (s) */ 136 uint32_t mli_uri; /* MLDv2 Unsolicited Report Interval (s) */ 137 struct mbufq mli_gq; /* queue of general query responses */ 138 }; 139 140 #define MLD_RANDOM_DELAY(X) (arc4random() % (X) + 1) 141 #define MLD_MAX_STATE_CHANGES 24 /* Max pending changes per group */ 142 143 /* 144 * Subsystem lock macros. 145 * The MLD lock is only taken with MLD. Currently it is system-wide. 146 * VIMAGE: The lock could be pushed to per-VIMAGE granularity in future. 147 */ 148 #define MLD_LOCK_INIT() mtx_init(&mld_mtx, "mld_mtx", NULL, MTX_DEF) 149 #define MLD_LOCK_DESTROY() mtx_destroy(&mld_mtx) 150 #define MLD_LOCK() mtx_lock(&mld_mtx) 151 #define MLD_LOCK_ASSERT() mtx_assert(&mld_mtx, MA_OWNED) 152 #define MLD_UNLOCK() mtx_unlock(&mld_mtx) 153 #define MLD_UNLOCK_ASSERT() mtx_assert(&mld_mtx, MA_NOTOWNED) 154 155 /* 156 * Per-link MLD context. 157 */ 158 #define MLD_IFINFO(ifp) \ 159 (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->mld_ifinfo) 160 161 struct in6_multi_head; 162 int mld_change_state(struct in6_multi *, const int); 163 struct mld_ifsoftc * 164 mld_domifattach(struct ifnet *); 165 void mld_domifdetach(struct ifnet *); 166 void mld_ifdetach(struct ifnet *, struct in6_multi_head *); 167 int mld_input(struct mbuf **, int, int); 168 169 #define MLD_SLOWHZ 2 /* 2 slow timeouts per second */ 170 #define MLD_FASTHZ 5 /* 5 fast timeouts per second */ 171 172 #ifdef SYSCTL_DECL 173 SYSCTL_DECL(_net_inet6_mld); 174 #endif 175 176 #endif /* _KERNEL */ 177 178 #endif /* _NETINET6_MLD6_VAR_H_ */ 179