diff options
| author | dg <dg@FreeBSD.org> | 1994-08-08 11:43:44 +0000 |
|---|---|---|
| committer | dg <dg@FreeBSD.org> | 1994-08-08 11:43:44 +0000 |
| commit | 4eb7e7f1c4f88d90fb0b4d34026548de68a78528 (patch) | |
| tree | c4383145971015f4f2fcfebb90e974276569c76a /sys/net/if.c | |
| parent | 6a73fab070480164f53deb222e4bf079ece7aed7 (diff) | |
| download | FreeBSD-src-4eb7e7f1c4f88d90fb0b4d34026548de68a78528.zip FreeBSD-src-4eb7e7f1c4f88d90fb0b4d34026548de68a78528.tar.gz | |
On second thought, better restrict the mtu to between 72-65535...strange
things happen otherwise.
Diffstat (limited to 'sys/net/if.c')
| -rw-r--r-- | sys/net/if.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/sys/net/if.c b/sys/net/if.c index 5a60f6e..76718e2 100644 --- a/sys/net/if.c +++ b/sys/net/if.c @@ -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)); |
