From owner-freebsd-bugs  Fri Dec  6  1:30: 5 2002
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Date: Fri, 6 Dec 2002 01:30:02 -0800 (PST)
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To: freebsd-bugs@FreeBSD.org
Cc: 
From: Dmitry Frolov <frolov@riss-telecom.ru>
Subject: Re: kern/42120: arp(8) fails due to ioctl SIOCGIFNETMASK failure
Reply-To: Dmitry Frolov <frolov@riss-telecom.ru>
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The following reply was made to PR kern/42120; it has been noted by GNATS.

From: Dmitry Frolov <frolov@riss-telecom.ru>
To: freebsd-gnats-submit@FreeBSD.org, eugen@www.svzserv.kemerovo.su
Cc:  
Subject: Re: kern/42120: arp(8) fails due to ioctl SIOCGIFNETMASK failure
Date: Fri, 6 Dec 2002 15:23:07 +0600

 We experienced same behavior from arp(8). Workaround was to use
 route(8) with -proxy option.
 
 However we made a fix: according to sys/netinet/in.c (see in_control()
 function) we should set alias address in SIOCGIFNETMASK ifreq
 to get correct netmask for that address.
 
 Here is the patch (made for 4.6-R, but code in -current
 still the same):
 
 --- usr.sbin/arp/arp.c.orig	Thu Jul 11 16:24:31 2002
 +++ usr.sbin/arp/arp.c	Thu Jul 11 16:24:17 2002
 @@ -703,6 +703,8 @@
  			 * Get its netmask and check that it's on 
  			 * the right subnet.
  			 */
 +			((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr =
 +				ina;
  			if (ioctl(sock, SIOCGIFNETMASK, &ifreq) < 0)
  				continue;
  			mask = ((struct sockaddr_in *)
 
 Also note that it's not a kern but bin problem.
 
 -- 
 Dmitry Frolov <frolov@riss-telecom.ru>
 RISS-Telecom Network, Novosibirsk, Russia
 66415911@ICQ, +7 3832 NO WA1T, DVF-RIPE

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