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Add a knob to suppress logging of attempts to modify

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permanent ARP entries.

Submitted by:	Andrew Alcheyev <buddy telenet.ru>
This commit is contained in:
glebius 2005-12-18 19:11:56 +00:00
parent 175e16aa4d
commit cfbe2fd3f7
2 changed files with 19 additions and 7 deletions
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17
sys/netinet/if_ether.c
View File

@ -570,6 +570,7 @@ arpintr(struct mbuf *m)
*/
static int log_arp_wrong_iface = 1;
static int log_arp_movements = 1;
static int log_arp_permanent_modify = 1;
SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_wrong_iface, CTLFLAG_RW,
&log_arp_wrong_iface, 0,
@ -577,6 +578,9 @@ SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_wrong_iface, CTLFLAG_RW,
SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_movements, CTLFLAG_RW,
&log_arp_movements, 0,
"log arp replies from MACs different than the one in the cache");
SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_permanent_modify, CTLFLAG_RW,
&log_arp_permanent_modify, 0,
"log arp replies from MACs different than the one in the permanent arp entry");
static void
@ -721,12 +725,13 @@ match:
ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
ifp->if_xname);
} else {
log(LOG_ERR,
"arp: %*D attempts to modify permanent entry for %s on %s\n",
ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
inet_ntoa(isaddr), ifp->if_xname);
RT_UNLOCK(rt);
goto reply;
RT_UNLOCK(rt);
if (log_arp_permanent_modify)
log(LOG_ERR, "arp: %*D attempts to modify "
"permanent entry for %s on %s\n",
ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
inet_ntoa(isaddr), ifp->if_xname);
goto reply;
}
}
/*

9
usr.sbin/arp/arp.4
View File

@ -28,7 +28,7 @@
.\" @(#)arp4.4 6.5 (Berkeley) 4/18/94
.\" $FreeBSD$
.\"
.Dd November 24, 2005
.Dd December 18, 2005
.Dt ARP 4
.Os
.Sh NAME
@ -169,6 +169,13 @@ to if1.
This message can only be issued if the sysctl
.Va net.link.ether.inet.log_arp_wrong_iface
is set to 1, which is the system's default behaviour.
.Pp
.Em "arp: %x:%x:%x:%x:%x:%x attempts to modify permanent entry for %d.%d.%d.%d on %s" :
ARP has received an ARP reply that attempts to overwrite a permanent
antry in the local ARP table.
This error will be only logged, if the sysctl
.Va net.link.ether.inet.log_arp_permanent_modify
is set to 1, which is the system's default behaviour.
.Sh SEE ALSO
.Xr inet 4 ,
.Xr route 4 ,