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add arpresolve and arpintr descriptions

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is 1997-03-17 14:06:49 +00:00
parent 175e17b45f
commit 6ecca3f700
2 changed files with 58 additions and 8 deletions
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4
share/man/man9/Makefile
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@ -1,4 +1,4 @@
# $NetBSD: Makefile,v 1.17 1997/03/16 19:43:17 is Exp $
# $NetBSD: Makefile,v 1.18 1997/03/17 14:06:49 is Exp $
# Makefile for section 9 (kernel function and variable) manual pages.
@ -7,7 +7,7 @@ MAN= access.9 arp.9 boot.9 copy.9 ctxsw.9 \
extent.9 fetch.9 inittodr.9 malloc.9 panic.9 pfil.9 physio.9 \
psignal.9 resettodr.9 shutdownhook_establish.9 sleep.9 spl.9 \
store.9 time.9 timeout.9 vslock.9
MLINKS+=arp.9 arp_ifinit.9
MLINKS+=arp.9 arp_ifinit.9 arp.9 arpresolve.9 arp.9 arpintr.9
MLINKS+=access.9 kernacc.9 access.9 useracc.9
MLINKS+=copy.9 copyin.9 copy.9 copyout.9 copy.9 copystr.9 \
copy.9 copyinstr.9 copy.9 copyoutstr.9

62
share/man/man9/arp.9
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@ -1,4 +1,4 @@
.\" $NetBSD: arp.9,v 1.5 1997/03/16 20:24:08 is Exp $
.\" $NetBSD: arp.9,v 1.6 1997/03/17 14:06:50 is Exp $
.\"
.\" Copyright (c) 1997 Ignatios Souvatzis.
.\" All rights reserved.
@ -41,6 +41,10 @@
.Fd #include <netinet/if_inarp.h>
.Ft void
.Fn arp_ifinit "struct ifnet *ifp" "struct ifaddr *ifa"
.Ft int
.Fn arpresolve "struct ifnet *ifp" "struct rtentry *rt" "struct mbuf *m" "struct sockaddr *dst" "u_char *desten"
.Ft void
.Fn arpintr
.Sh DESCRIPTION
The
.Nm
@ -48,22 +52,68 @@ functions provide the interface between the
.Nm
module and the network drivers which need
.Nm
functionality.
functionality. Such drivers must request the
arp
attribute in their "files" declaration.
.Bl -tag -width "arp_ifinit()"
.It Fn arp_ifinit
Sets up the
.Nm
specific fields in
.Fa ifa .
Additionally, it sends out a gratitious ARP request on
Additionally, it sends out a gratitious
.Nm
request on
.Fa ifp ,
so that other machines are warned that we have a new address and
so that other machines are warned that we have a (new) address and
duplicate addresses can be detected.
.It Fn arpresolve
is called by network output functions to resolve an IPv4 address.
If no
.Fa rt
is given, a new one is looked up or created. If the passed or found
.Fa rt
does not contain a valid gateway link level address, a pointer to the packet
in
.Fa m
is stored in the route entry, possibly replacing older stored packets, and an
.Nm
request is sent instead. When an
.Nm
reply is received, the last held packet is send.
Otherwise, the looked up address is returned and written into the storage
.Fa desten
points to.
.Fn arpresolve
returns 1, if a valid address was stored to
.Fa desten ,
and the packet can be sent immediately. Else a 0 is returned.
.It Fn arpintr
When an
.Nm
packet is received, the network driver (class) input interupt handler queues
the packet on the arpintrq queue, and requests an
.Fn arpintr
soft interupt callback.
.Fn arpintr
dequeues the packets, performs sanity checks and calls (for IPv4
.Nm
packes, which are the only ones supported currently) the
.Fn in_arpinput
function.
.Fn in_arpinput
either generates a reply to request packets, and adds the sender address
translation to to the routing table, if a matching route entry is found.
If the route entry contained a pointer to a held packet, that packet is
sent.
.El
.Sh RETURN VALUES
None.
.\" .Sh ERRORS