/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2009 Bruce Simpson.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _NETINET6_MLD6_VAR_H_
#define _NETINET6_MLD6_VAR_H_
/*
* Multicast Listener Discovery (MLD)
* implementation-specific definitions.
*/
/*
* MLD per-group states.
*/
#define MLD_NOT_MEMBER 0 /* Can garbage collect group */
#define MLD_SILENT_MEMBER 1 /* Do not perform MLD for group */
#define MLD_REPORTING_MEMBER 2 /* MLDv1 we are reporter */
#define MLD_IDLE_MEMBER 3 /* MLDv1 we reported last */
#define MLD_LAZY_MEMBER 4 /* MLDv1 other member reporting */
#define MLD_SLEEPING_MEMBER 5 /* MLDv1 start query response */
#define MLD_AWAKENING_MEMBER 6 /* MLDv1 group timer will start */
#define MLD_G_QUERY_PENDING_MEMBER 7 /* MLDv2 group query pending */
#define MLD_SG_QUERY_PENDING_MEMBER 8 /* MLDv2 source query pending */
#define MLD_LEAVING_MEMBER 9 /* MLDv2 dying gasp (pending last */
/* retransmission of INCLUDE {}) */
/*
* MLD version tag.
*/
#define MLD_VERSION_NONE 0 /* Invalid */
#define MLD_VERSION_1 1
#define MLD_VERSION_2 2 /* Default */
/*
* MLDv2 protocol control variables.
*/
#define MLD_RV_INIT 2 /* Robustness Variable */
#define MLD_RV_MIN 1
#define MLD_RV_MAX 7
#define MLD_QI_INIT 125 /* Query Interval (s) */
#define MLD_QI_MIN 1
#define MLD_QI_MAX 255
#define MLD_QRI_INIT 10 /* Query Response Interval (s) */
#define MLD_QRI_MIN 1
#define MLD_QRI_MAX 255
#define MLD_URI_INIT 3 /* Unsolicited Report Interval (s) */
#define MLD_URI_MIN 0
#define MLD_URI_MAX 10
#define MLD_MAX_GS_SOURCES 256 /* # of sources in rx GS query */
#define MLD_MAX_G_GS_PACKETS 8 /* # of packets to answer G/GS */
#define MLD_MAX_STATE_CHANGE_PACKETS 8 /* # of packets per state change */
#define MLD_MAX_RESPONSE_PACKETS 16 /* # of packets for general query */
#define MLD_MAX_RESPONSE_BURST 4 /* # of responses to send at once */
#define MLD_RESPONSE_BURST_INTERVAL (MLD_FASTHZ / 2) /* 500ms */
/*
* MLD-specific mbuf flags.
*/
#define M_MLDV1 M_PROTO1 /* Packet is MLDv1 */
#define M_GROUPREC M_PROTO3 /* mbuf chain is a group record */
/*
* Leading space for MLDv2 reports inside MTU.
*
* NOTE: This differs from IGMPv3 significantly. KAME IPv6 requires
* that a fully formed mbuf chain *without* the Router Alert option
* is passed to ip6_output(), however we must account for it in the
* MTU if we need to split an MLDv2 report into several packets.
*
* We now put the MLDv2 report header in the initial mbuf containing
* the IPv6 header.
*/
#define MLD_MTUSPACE (sizeof(struct ip6_hdr) + sizeof(struct mld_raopt) + \
sizeof(struct icmp6_hdr))
/*
* Structure returned by net.inet6.mld.ifinfo.
*/
struct mld_ifinfo {
uint32_t mli_version; /* MLDv1 Host Compatibility Mode */
uint32_t mli_v1_timer; /* MLDv1 Querier Present timer (s) */
uint32_t mli_v2_timer; /* MLDv2 General Query (interface) timer (s)*/
uint32_t mli_flags; /* MLD per-interface flags */
#define MLIF_SILENT 0x00000001 /* Do not use MLD on this ifp */
#define MLIF_USEALLOW 0x00000002 /* Use ALLOW/BLOCK for joins/leaves */
uint32_t mli_rv; /* MLDv2 Robustness Variable */
uint32_t mli_qi; /* MLDv2 Query Interval (s) */
uint32_t mli_qri; /* MLDv2 Query Response Interval (s) */
uint32_t mli_uri; /* MLDv2 Unsolicited Report Interval (s) */
};
#ifdef _KERNEL
/*
* Per-link MLD state.
*/
struct mld_ifsoftc {
LIST_ENTRY(mld_ifsoftc) mli_link;
struct ifnet *mli_ifp; /* interface this instance belongs to */
uint32_t mli_version; /* MLDv1 Host Compatibility Mode */
uint32_t mli_v1_timer; /* MLDv1 Querier Present timer (s) */
uint32_t mli_v2_timer; /* MLDv2 General Query (interface) timer (s)*/
uint32_t mli_flags; /* MLD per-interface flags */
uint32_t mli_rv; /* MLDv2 Robustness Variable */
uint32_t mli_qi; /* MLDv2 Query Interval (s) */
uint32_t mli_qri; /* MLDv2 Query Response Interval (s) */
uint32_t mli_uri; /* MLDv2 Unsolicited Report Interval (s) */
struct mbufq mli_gq; /* queue of general query responses */
};
#define MLD_RANDOM_DELAY(X) (arc4random() % (X) + 1)
#define MLD_MAX_STATE_CHANGES 24 /* Max pending changes per group */
/*
* Subsystem lock macros.
* The MLD lock is only taken with MLD. Currently it is system-wide.
* VIMAGE: The lock could be pushed to per-VIMAGE granularity in future.
*/
#define MLD_LOCK_INIT() mtx_init(&mld_mtx, "mld_mtx", NULL, MTX_DEF)
#define MLD_LOCK_DESTROY() mtx_destroy(&mld_mtx)
#define MLD_LOCK() mtx_lock(&mld_mtx)
#define MLD_LOCK_ASSERT() mtx_assert(&mld_mtx, MA_OWNED)
#define MLD_UNLOCK() mtx_unlock(&mld_mtx)
#define MLD_UNLOCK_ASSERT() mtx_assert(&mld_mtx, MA_NOTOWNED)
/*
* Per-link MLD context.
*/
#define MLD_IFINFO(ifp) \
(((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->mld_ifinfo)
struct in6_multi_head;
int mld_change_state(struct in6_multi *, const int);
struct mld_ifsoftc *
mld_domifattach(struct ifnet *);
void mld_domifdetach(struct ifnet *);
void mld_ifdetach(struct ifnet *, struct in6_multi_head *);
int mld_input(struct mbuf **, int, int);
#define MLD_SLOWHZ 2 /* 2 slow timeouts per second */
#define MLD_FASTHZ 5 /* 5 fast timeouts per second */
#ifdef SYSCTL_DECL
SYSCTL_DECL(_net_inet6_mld);
#endif
#endif /* _KERNEL */
#endif /* _NETINET6_MLD6_VAR_H_ */
plain