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Fix panic when an interface in promiscuous mode goes down and the BPF user 

tries to turn off promiscuous mode.  From Lon Willett.
This commit is contained in:
mycroft 1995-03-22 16:08:32 +00:00
parent dd94184a46
commit b468ed3d00
1 changed files with 19 additions and 8 deletions
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27
sys/net/bpf.c
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@ -1,4 +1,4 @@
/* $NetBSD: bpf.c,v 1.17 1995/02/23 07:19:49 glass Exp $ */
/* $NetBSD: bpf.c,v 1.18 1995/03/22 16:08:32 mycroft Exp $ */
/*
* Copyright (c) 1990, 1991, 1993
@ -271,8 +271,11 @@ bpf_detachd(d)
* If so, turn it off.
*/
if (d->bd_promisc) {
int error;
d->bd_promisc = 0;
if (ifpromisc(bp->bif_ifp, 0))
error = ifpromisc(bp->bif_ifp, 0);
if (error && error != EINVAL)
/*
* Something is really wrong if we were able to put
* the driver into promiscuous mode, but can't
@ -1266,14 +1269,14 @@ ifpromisc(ifp, pswitch)
int pswitch;
{
struct ifreq ifr;
/*
* If the device is not configured up, we cannot put it in
* promiscuous mode.
*/
if ((ifp->if_flags & IFF_UP) == 0)
return (ENETDOWN);
if (pswitch) {
/*
* If the device is not configured up, we cannot put it in
* promiscuous mode.
*/
if ((ifp->if_flags & IFF_UP) == 0)
return (ENETDOWN);
if (ifp->if_pcount++ != 0)
return (0);
ifp->if_flags |= IFF_PROMISC;
@ -1281,6 +1284,14 @@ ifpromisc(ifp, pswitch)
if (--ifp->if_pcount > 0)
return (0);
ifp->if_flags &= ~IFF_PROMISC;
/*
* If the device is not configured up, we should not need to
* turn off promiscuous mode (device should have turned it
* off when interface went down; and will look at IFF_PROMISC
* again next time interface comes up).
*/
if ((ifp->if_flags & IFF_UP) == 0)
return (0);
}
ifr.ifr_flags = ifp->if_flags;
return ((*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr));