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Add support for a DEC FDDI input filter.

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This commit is contained in:
Ted Lemon
2000-03-24 00:21:47 +00:00
parent 2cc8232d46
commit 95e585542a
1 changed files with 32 additions and 1 deletions
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33
common/bpf.c
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@@ -43,7 +43,7 @@
#ifndef lint
static char copyright[] =
"$Id: bpf.c,v 1.35 2000/03/17 03:59:00 mellon Exp $ Copyright (c) 1995-2000 The Internet Software Consortium. All rights reserved.\n";
"$Id: bpf.c,v 1.36 2000/03/24 00:21:47 mellon Exp $ Copyright (c) 1995-2000 The Internet Software Consortium. All rights reserved.\n";
#endif /* not lint */
#include "dhcpd.h"
@@ -206,6 +206,8 @@ struct bpf_insn dhcp_bpf_filter [] = {
BPF_STMT(BPF_RET+BPF_K, 0),
};
struct bpf_insn *bpf_fddi_filter;
int dhcp_bpf_filter_len = sizeof dhcp_bpf_filter / sizeof (struct bpf_insn);
struct bpf_insn dhcp_bpf_tr_filter [] = {
/* accept all token ring packets due to variable length header */
@@ -231,6 +233,9 @@ void if_register_receive (info)
u_int32_t addr;
struct bpf_program p;
u_int32_t bits;
#ifdef DEC_FDDI
int link_layer;
#endif /* DEC_FDDI */
/* Open a BPF device and hang it on this interface... */
info -> rfdesc = if_register_bpf (info);
@@ -276,6 +281,32 @@ void if_register_receive (info)
/* Set up the bpf filter program structure. */
p.bf_len = dhcp_bpf_filter_len;
#ifdef DEC_FDDI
/* See if this is an FDDI interface, flag it for later. */
if (ioctl(info -> rfdesc, BIOCGDLT, &link_layer) >= 0 &&
link_layer == DLT_FDDI) {
if (!dhcp_fddi_filter) {
dhcp_fddi_filter = dmalloc (sizeof dhcp_bpf_filter,
MDL);
if (!dhcp_fddi_filter)
log_fatal ("No memory for FDDI filter.");
memcpy (dhcp_fddi_filter,
dhcp_bpf_filter, sizeof dhcp_bpf_filter);
/* Patch the BPF program to account for the difference
in length between ethernet headers (14), FDDI and
802.2 headers (16 +8=24, +10).
XXX changes to filter program may require changes to
XXX the insn number(s) used below! */
dhcp_fddi_filter[0].k += 10;
dhcp_fddi_filter[2].k += 10;
dhcp_fddi_filter[4].k += 10;
dhcp_fddi_filter[6].k += 10;
dhcp_fddi_filter[7].k += 10;
}
p.bf_insns = dhcp_fddi_filter;
} else
#endif /* DEC_FDDI */
p.bf_insns = dhcp_bpf_filter;
/* Patch the server port into the BPF program...