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The only two data link types that support the "inbound" and "outbound" 

qualifiers are DLT_SLIP and DLT_PPP (i.e. old-style serial encap PPP).
If an attempt to use these qualifiers is used for any other link type,
cause a BPF program compilation error.
This commit is contained in:
thorpej 1999-05-15 17:39:07 +00:00
parent fc3f28c6bd
commit b62918959e
1 changed files with 18 additions and 2 deletions
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20
lib/libpcap/gencode.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: gencode.c,v 1.11 1999/05/11 06:36:26 thorpej Exp $ */
/* $NetBSD: gencode.c,v 1.12 1999/05/15 17:39:07 thorpej Exp $ */
/*
* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
@ -26,7 +26,7 @@
static const char rcsid[] =
"@(#) Header: gencode.c,v 1.93 97/06/12 14:22:47 leres Exp (LBL)";
#else
__RCSID("$NetBSD: gencode.c,v 1.11 1999/05/11 06:36:26 thorpej Exp $");
__RCSID("$NetBSD: gencode.c,v 1.12 1999/05/15 17:39:07 thorpej Exp $");
#endif
#endif
@ -1962,6 +1962,22 @@ gen_inbound(dir)
{
register struct block *b0;
/*
* Only SLIP and old-style PPP data link types support
* inbound/outbound qualifiers.
*/
switch (linktype) {
case DLT_SLIP:
case DLT_PPP:
/* These are okay. */
break;
default:
bpf_error("inbound/outbound not supported on linktype 0x%x\n",
linktype);
/* NOTREACHED */
}
b0 = gen_relation(BPF_JEQ,
gen_load(Q_LINK, gen_loadi(0), 1),
gen_loadi(0),