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Allow interfaces to be attached to bpf at times other than boot.

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doing so without this patch leads to an infinite loop in the kernel.
This commit is contained in:
Julian Elischer 1997-10-03 21:32:05 +00:00
parent b9b51fb731
commit ed0af9bc44
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=30090
1 changed files with 5 additions and 2 deletions
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7
sys/net/bpf.c
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@ -37,7 +37,7 @@
*
* @(#)bpf.c 8.2 (Berkeley) 3/28/94
*
* $Id: bpf.c,v 1.33 1997/09/14 03:03:05 peter Exp $
* $Id: bpf.c,v 1.34 1997/09/16 11:43:42 bde Exp $
*/
#include "bpfilter.h"
@ -119,6 +119,7 @@ SYSCTL_INT(_debug, OID_AUTO, bpf_bufsize, CTLFLAG_RW,
*/
static struct bpf_if *bpf_iflist;
static struct bpf_d bpf_dtab[NBPFILTER];
static int bpf_dtab_init;
static int bpf_allocbufs __P((struct bpf_d *));
static void bpf_attachd __P((struct bpf_d *d, struct bpf_if *bp));
@ -1264,9 +1265,11 @@ bpfattach(ifp, dlt, hdrlen)
/*
* Mark all the descriptors free if this hasn't been done.
*/
if (!D_ISFREE(&bpf_dtab[0]))
if (!bpf_dtab_init) {
for (i = 0; i < NBPFILTER; ++i)
D_MARKFREE(&bpf_dtab[i]);
bpf_dtab_init = 1;
}
if (bootverbose)
printf("bpf: %s%d attached\n", ifp->if_name, ifp->if_unit);