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On second thought, better restrict the mtu to between 72-65535...strange

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things happen otherwise.
This commit is contained in:
David Greenman 1994-08-08 11:43:44 +00:00
parent 75ee03cb27
commit 660255695f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=1943
1 changed files with 6 additions and 2 deletions
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8
sys/net/if.c
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)if.c 8.3 (Berkeley) 1/4/94
* $Id: if.c,v 1.3 1994/08/08 10:49:18 davidg Exp $
* $Id: if.c,v 1.4 1994/08/08 10:58:30 davidg Exp $
*/
#include <sys/param.h>
@ -520,7 +520,11 @@ ifioctl(so, cmd, data, p)
return (error);
if (ifp->if_ioctl == NULL)
return (EOPNOTSUPP);
if (ifr->ifr_mtu < 1 || ifr->ifr_mtu > 65535)
/*
* 72 was chosen below because it is the size of a TCP/IP
* header (40) + the minimum mss (32).
*/
if (ifr->ifr_mtu < 72 || ifr->ifr_mtu > 65535)
return (EINVAL);
return ((*ifp->if_ioctl)(ifp, cmd, data));