Date: Thu, 15 Jun 1995 20:40:01 -0700 From: Dmitry Khrustalev <dima@satty.npi.msu.su> To: freebsd-bugs Subject: kern/522: Message-ID: <199506160340.UAA09949@freefall.cdrom.com> In-Reply-To: Your message of Fri, 16 Jun 1995 03:38:34 GMT <199506160338.DAA19369@satty.npi.msu.su>
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>Number: 522
>Category: kern
>Synopsis:
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs (FreeBSD bugs mailing list)
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Jun 15 20:40:00 1995
>Originator: Dmitry Khrustalev
>Organization:
Moscow State University
>Release: FreeBSD 2.1.0-Development i386
>Environment:
>Description:
If interface goes down while bpf is listening on it in promiscuous
mode, closing bpf will panic system in bpf.c line 278.
panic: bpf: ifpromisc failed
>How-To-Repeat:
Start tcpdump on ppp interface while pppd is running. Terminate
pppd. Terminating tcpdump will result in panic.
>Fix:
This fix changes current bpf behavior, however current behavior has problems:
for example if transmitting a packet results in interface going up, how do
we capture this packet?
*** bpf.c.orig Fri Jun 16 06:12:07 1995
--- bpf.c Fri Jun 16 06:12:35 1995
***************
*** 1261,1272 ****
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 (ifp->if_pcount++ != 0)
--- 1261,1266 ----
>Audit-Trail:
>Unformatted:
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