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Allow loadable interface drivers with BPF support to be loaded into a kernel

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that doesn't have it.  This is achieved by having minimal do-nothing stubs
enabled when there are no bpfilter devices configured.

Driver modules should be built with BPF enabled for maximum
convenience (but can be built without it for maximum performance).
This commit is contained in:
Mike Smith 1999-04-28 01:18:13 +00:00
parent 5206bca10a
commit f8dc47162a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=46130
6 changed files with 51 additions and 12 deletions
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2
sys/conf/files
View File

@ -387,7 +387,7 @@ ntfs/ntfs_vnops.c optional ntfs
ntfs/ntfs_subr.c optional ntfs
ntfs/ntfs_compr.c optional ntfs
ntfs/ntfs_ihash.c optional ntfs
net/bpf.c optional bpfilter
net/bpf.c standard
net/bpf_filter.c optional bpfilter
net/bridge.c optional bridge
net/bsd_comp.c optional ppp_bsdcomp

4
sys/modules/if_disc/Makefile
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@ -1,11 +1,11 @@
# $Id: Makefile,v 1.5 1998/02/01 18:12:13 bde Exp $
# $Id: Makefile,v 1.6 1998/10/16 04:30:44 peter Exp $
.PATH: ${.CURDIR}/../../net
KMOD= if_disc
SRCS= if_disc.c bpfilter.h opt_inet.h
NOMAN=
NBPFILTER?= 0
NBPFILTER?= 1
CFLAGS+= ${PROTOS}
CLEANFILES+= bpfilter.h opt_inet.h

4
sys/modules/if_ppp/Makefile
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@ -1,4 +1,4 @@
# $Id: Makefile,v 1.15 1998/10/16 04:30:44 peter Exp $
# $Id: Makefile,v 1.16 1999/01/17 20:53:48 peter Exp $
.PATH: ${.CURDIR}/../../net
KMOD= if_ppp
@ -10,7 +10,7 @@ CLEANFILES+= vnode_if.c vnode_if.h
NPPP?= 2
PPP_BSDCOMP?= 1 # 0/1
PPP_DEFLATE?= 1 # 0/1
PPP_FILTER?= 0 # 0/1 - requires bpf to be configured in kernel
PPP_FILTER?= 1 # 0/1 - requires bpf to be configured in kernel
PPP_INET?= 1 # 0/1 - requires INET to be configured in kernel
PPP_IPX?= 0 # 0/1 - requires IPX to be configured in kernel

4
sys/modules/if_sl/Makefile
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@ -1,11 +1,11 @@
# $Id: Makefile,v 1.6 1998/02/01 18:12:14 bde Exp $
# $Id: Makefile,v 1.7 1998/10/16 04:30:45 peter Exp $
.PATH: ${.CURDIR}/../../net
KMOD= if_sl
SRCS= if_sl.c slcompress.c bpfilter.h opt_inet.h sl.h
NOMAN=
NBPFILTER?= 0
NBPFILTER?= 1
NSL?= 2
PROTOS?= -DINET

4
sys/modules/if_tun/Makefile
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@ -1,4 +1,4 @@
# $Id: Makefile,v 1.7 1998/10/16 04:30:45 peter Exp $
# $Id: Makefile,v 1.8 1999/01/17 20:53:47 peter Exp $
.PATH: ${.CURDIR}/../../net
KMOD= if_tun
@ -6,7 +6,7 @@ SRCS= if_tun.c bpfilter.h opt_devfs.h opt_inet.h tun.h vnode_if.h
NOMAN=
CLEANFILES+= vnode_if.h vnode_if.c
NBPFILTER?= 0
NBPFILTER?= 1
NTUN?= 2
CFLAGS+= ${PROTOS}

45
sys/net/bpf.c
View File

@ -37,13 +37,11 @@
*
* @(#)bpf.c 8.2 (Berkeley) 3/28/94
*
* $Id: bpf.c,v 1.46 1998/12/07 21:58:36 archie Exp $
* $Id: bpf.c,v 1.47 1999/01/27 22:42:13 dillon Exp $
*/
#include "bpfilter.h"
#if NBPFILTER > 0
#ifndef __GNUC__
#define inline
#else
@ -86,6 +84,7 @@
#include <sys/devfsext.h>
#endif /*DEVFS*/
#if NBPFILTER > 0
/*
* Older BSDs don't have kernel malloc.
@ -1309,4 +1308,44 @@ bpf_drvinit(unused)
SYSINIT(bpfdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,bpf_drvinit,NULL)
#else /* !BPFILTER */
/*
* NOP stubs to allow bpf-using drivers to load and function.
*
* A 'better' implementation would allow the core bpf functionality
* to be loaded at runtime.
*/
void
bpf_tap(ifp, pkt, pktlen)
struct ifnet *ifp;
register u_char *pkt;
register u_int pktlen;
{
}
void
bpf_mtap(ifp, m)
struct ifnet *ifp;
struct mbuf *m;
{
}
void
bpfattach(ifp, dlt, hdrlen)
struct ifnet *ifp;
u_int dlt, hdrlen;
{
}
u_int
bpf_filter(pc, p, wirelen, buflen)
register struct bpf_insn *pc;
register u_char *p;
u_int wirelen;
register u_int buflen;
{
return -1; /* "no filter" behaviour */
}
#endif