mld6_var.h revision 191672 
1/*-
2 * Copyright (c) 2009 Bruce Simpson.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote
13 *    products derived from this software without specific prior written
14 *    permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: head/sys/netinet6/mld6_var.h 191672 2009-04-29 19:19:13Z bms $
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#ifdef _KERNEL
39
40/*
41 * Per-link MLD state.
42 */
43struct mld_ifinfo {
44	LIST_ENTRY(mld_ifinfo) mli_link;
45	struct ifnet *mli_ifp;	/* interface this instance belongs to */
46	uint32_t mli_version;	/* MLDv1 Host Compatibility Mode */
47	uint32_t mli_v1_timer;	/* MLDv1 Querier Present timer (s) */
48	uint32_t mli_v2_timer;	/* MLDv2 General Query (interface) timer (s)*/
49	uint32_t mli_flags;	/* MLD per-interface flags */
50	uint32_t mli_rv;	/* MLDv2 Robustness Variable */
51	uint32_t mli_qi;	/* MLDv2 Query Interval (s) */
52	uint32_t mli_qri;	/* MLDv2 Query Response Interval (s) */
53	uint32_t mli_uri;	/* MLDv2 Unsolicited Report Interval (s) */
54	SLIST_HEAD(,in6_multi)	mli_relinmhead; /* released groups */
55	struct ifqueue	 mli_gq;	/* queue of general query responses */
56};
57#define MLIF_SILENT	0x00000001	/* Do not use MLD on this ifp */
58
59#define MLD_RANDOM_DELAY(X)		(arc4random() % (X) + 1)
60#define MLD_MAX_STATE_CHANGES		24 /* Max pending changes per group */
61
62/*
63 * MLD per-group states.
64 */
65#define MLD_NOT_MEMBER			0 /* Can garbage collect group */
66#define MLD_SILENT_MEMBER		1 /* Do not perform MLD for group */
67#define MLD_REPORTING_MEMBER		2 /* MLDv1 we are reporter */
68#define MLD_IDLE_MEMBER			3 /* MLDv1 we reported last */
69#define MLD_LAZY_MEMBER			4 /* MLDv1 other member reporting */
70#define MLD_SLEEPING_MEMBER		5 /* MLDv1 start query response */
71#define MLD_AWAKENING_MEMBER		6 /* MLDv1 group timer will start */
72#define MLD_G_QUERY_PENDING_MEMBER	7 /* MLDv2 group query pending */
73#define MLD_SG_QUERY_PENDING_MEMBER	8 /* MLDv2 source query pending */
74#define MLD_LEAVING_MEMBER		9 /* MLDv2 dying gasp (pending last */
75					  /* retransmission of INCLUDE {}) */
76
77/*
78 * MLD version tag.
79 */
80#define MLD_VERSION_NONE		0 /* Invalid */
81#define MLD_VERSION_1			1
82#define MLD_VERSION_2			2 /* Default */
83
84/*
85 * MLDv2 protocol control variables.
86 */
87#define MLD_RV_INIT		2	/* Robustness Variable */
88#define MLD_RV_MIN		1
89#define MLD_RV_MAX		7
90
91#define MLD_QI_INIT		125	/* Query Interval (s) */
92#define MLD_QI_MIN		1
93#define MLD_QI_MAX		255
94
95#define MLD_QRI_INIT		10	/* Query Response Interval (s) */
96#define MLD_QRI_MIN		1
97#define MLD_QRI_MAX		255
98
99#define MLD_URI_INIT		3	/* Unsolicited Report Interval (s) */
100#define MLD_URI_MIN		0
101#define MLD_URI_MAX		10
102
103#define MLD_MAX_GS_SOURCES		256 /* # of sources in rx GS query */
104#define MLD_MAX_G_GS_PACKETS		8 /* # of packets to answer G/GS */
105#define MLD_MAX_STATE_CHANGE_PACKETS	8 /* # of packets per state change */
106#define MLD_MAX_RESPONSE_PACKETS	16 /* # of packets for general query */
107#define MLD_MAX_RESPONSE_BURST		4 /* # of responses to send at once */
108#define MLD_RESPONSE_BURST_INTERVAL	(PR_FASTHZ / 2)	/* 500ms */
109
110/*
111 * MLD-specific mbuf flags.
112 */
113#define M_MLDV1		M_PROTO1	/* Packet is MLDv1 */
114#define M_GROUPREC	M_PROTO3	/* mbuf chain is a group record */
115
116/*
117 * Leading space for MLDv2 reports inside MTU.
118 *
119 * NOTE: This differs from IGMPv3 significantly. KAME IPv6 requires
120 * that a fully formed mbuf chain *without* the Router Alert option
121 * is passed to ip6_output(), however we must account for it in the
122 * MTU if we need to split an MLDv2 report into several packets.
123 *
124 * We now put the MLDv2 report header in the initial mbuf containing
125 * the IPv6 header.
126 */
127#define	MLD_MTUSPACE	(sizeof(struct ip6_hdr) + sizeof(struct mld_raopt) + \
128			 sizeof(struct icmp6_hdr))
129
130/*
131 * Subsystem lock macros.
132 * The MLD lock is only taken with MLD. Currently it is system-wide.
133 * VIMAGE: The lock could be pushed to per-VIMAGE granularity in future.
134 */
135#define	MLD_LOCK_INIT()	mtx_init(&mld_mtx, "mld_mtx", NULL, MTX_DEF)
136#define	MLD_LOCK_DESTROY()	mtx_destroy(&mld_mtx)
137#define	MLD_LOCK()		mtx_lock(&mld_mtx)
138#define	MLD_LOCK_ASSERT()	mtx_assert(&mld_mtx, MA_OWNED)
139#define	MLD_UNLOCK()		mtx_unlock(&mld_mtx)
140#define	MLD_UNLOCK_ASSERT()	mtx_assert(&mld_mtx, MA_NOTOWNED)
141
142/*
143 * Per-link MLD context.
144 */
145#define MLD_IFINFO(ifp) \
146	(((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->mld_ifinfo)
147
148int	mld_change_state(struct in6_multi *, const int);
149struct mld_ifinfo *
150	mld_domifattach(struct ifnet *);
151void	mld_domifdetach(struct ifnet *);
152void	mld_fasttimo(void);
153void	mld_ifdetach(struct ifnet *);
154int	mld_input(struct mbuf *, int, int);
155void	mld_slowtimo(void);
156
157#ifdef SYSCTL_DECL
158SYSCTL_DECL(_net_inet6_mld);
159#endif
160
161#endif /* _KERNEL */
162
163#endif /* _NETINET6_MLD6_VAR_H_ */
164