100 lines
3.8 KiB
C
100 lines
3.8 KiB
C
/* $NetBSD: nd.h,v 1.3 2020/09/15 10:05:36 roy Exp $ */
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/*
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* Copyright (c) 2020 The NetBSD Foundation, Inc.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Roy Marples.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _NET_ND_H_
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#define _NET_ND_H_
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/* ND LLINFO states */
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#define ND_LLINFO_PURGE -3
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#define ND_LLINFO_NOSTATE -2
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#define ND_LLINFO_WAITDELETE -1
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#define ND_LLINFO_INCOMPLETE 0
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#define ND_LLINFO_REACHABLE 1
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#define ND_LLINFO_STALE 2
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#define ND_LLINFO_DELAY 3
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#define ND_LLINFO_PROBE 4
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#define ND_LLINFO_UNREACHABLE 5
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#ifdef _KERNEL
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#define ND_IS_LLINFO_PROBREACH(ln) \
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((ln)->ln_state > ND_LLINFO_INCOMPLETE)
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#define ND_IS_LLINFO_PERMANENT(ln) \
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(((ln)->ln_expire == 0) && ((ln)->ln_state > ND_LLINFO_INCOMPLETE))
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/* ND timer types */
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#define ND_TIMER_IMMEDIATE 0
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#define ND_TIMER_TICK 1
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#define ND_TIMER_REACHABLE 2
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#define ND_TIMER_RETRANS 3
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#define ND_TIMER_RETRANS_BACKOFF 4
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#define ND_TIMER_EXPIRE 5
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#define ND_TIMER_DELAY 6
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#define ND_TIMER_GC 7
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/* node constants */
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#define MAX_REACHABLE_TIME 3600000 /* msec */
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#define REACHABLE_TIME 30000 /* msec */
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#define RETRANS_TIMER 1000 /* msec */
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#define MAX_RETRANS_TIMER 60000 /* msec */
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#define BACKOFF_MULTIPLE 3
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#define MIN_RANDOM_FACTOR 512 /* 1024 * 0.5 */
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#define MAX_RANDOM_FACTOR 1536 /* 1024 * 1.5 */
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#define ND_COMPUTE_RTIME(x) \
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((MIN_RANDOM_FACTOR * (x >> 10)) + (cprng_fast32() & \
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((MAX_RANDOM_FACTOR - MIN_RANDOM_FACTOR) * (x >> 10))))
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struct nd_domain {
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int nd_family;
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int nd_delay; /* delay first probe time in seconds */
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int nd_mmaxtries; /* maximum multicast query */
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int nd_umaxtries; /* maximum unicast query */
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int nd_retransmultiple; /* retransmission multiplier for backoff */
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int nd_maxretrans; /* maximum retransmission time in msec */
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int nd_maxnudhint; /* max # of subsequent upper layer hints */
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int nd_maxqueuelen; /* max # of packets in unresolved ND entries */
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bool (*nd_nud_enabled)(struct ifnet *);
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unsigned int (*nd_reachable)(struct ifnet *); /* msec */
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unsigned int (*nd_retrans)(struct ifnet *); /* msec */
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union l3addr *(*nd_holdsrc)(struct llentry *, union l3addr *);
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void (*nd_output)(struct ifnet *, const union l3addr *,
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const union l3addr *, const uint8_t *, const union l3addr *);
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void (*nd_missed)(struct ifnet *, const union l3addr *,
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int16_t, struct mbuf *);
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void (*nd_free)(struct llentry *, int);
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};
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int nd_resolve(struct llentry *, const struct rtentry *, struct mbuf *,
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uint8_t *, size_t);
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void nd_set_timer(struct llentry *, int);
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void nd_nud_hint(struct llentry *);
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void nd_attach_domain(struct nd_domain *);
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#endif /* !_KERNEL */
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#endif /* !_NET_ND_H_ */
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