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fixed BPF generation of OSI over {CHDLC and ATM-LLC} frames

This commit is contained in:
hannes 2002-12-04 21:40:13 +00:00
parent 215669fbe8
commit 531a7bbb14
1 changed files with 67 additions and 14 deletions
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81
gencode.c
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@ -21,7 +21,7 @@
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.180 2002-10-18 08:46:13 guy Exp $ (LBL)";
"@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.181 2002-12-04 21:40:13 hannes Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
@ -839,6 +839,10 @@ init_linktype(type)
return;
case DLT_ATM_RFC1483:
off_linktype = 0;
off_nl = 4; /* FIXME SNAP */
return;
case DLT_ATM_CLIP: /* Linux ATM defines this */
/*
* assume routed, non-ISO PDUs
@ -964,9 +968,6 @@ gen_ether_linktype(proto)
case LLCSAP_ISONS:
/*
* OSI protocols always use 802.2 encapsulation.
* XXX - should we check both the DSAP and the
* SSAP, like this, or should we check just the
* DSAP?
*/
b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
gen_not(b0);
@ -975,12 +976,17 @@ gen_ether_linktype(proto)
gen_and(b0, b1);
return b1;
case LLCSAP_IP:
b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
gen_not(b0);
b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)
((LLCSAP_IP << 8) | LLCSAP_IP));
gen_and(b0, b1);
return b1;
case LLCSAP_NETBEUI:
/*
* NetBEUI always uses 802.2 encapsulation.
* XXX - should we check both the DSAP and the
* SSAP, like this, or should we check just the
* DSAP?
*/
b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
gen_not(b0);
@ -1141,6 +1147,15 @@ gen_linktype(proto)
return gen_ether_linktype(proto);
break;
case DLT_C_HDLC:
switch (proto) {
case LLCSAP_ISONS:
proto = (proto << 8 | LLCSAP_ISONS);
/* fall through */
default:
return gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
break;
}
case DLT_IEEE802_11:
case DLT_PRISM_HEADER:
case DLT_FDDI:
@ -1188,12 +1203,16 @@ gen_linktype(proto)
case DLT_LINUX_SLL:
switch (proto) {
case LLCSAP_IP:
b0 = gen_cmp(off_linktype, BPF_H, LINUX_SLL_P_802_2);
b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)
((LLCSAP_IP << 8) | LLCSAP_IP));
gen_and(b0, b1);
return b1;
case LLCSAP_ISONS:
/*
* OSI protocols always use 802.2 encapsulation.
* XXX - should we check both the DSAP and the
* LSAP, like this, or should we check just the
* DSAP?
*/
b0 = gen_cmp(off_linktype, BPF_H, LINUX_SLL_P_802_2);
b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)
@ -1372,7 +1391,7 @@ gen_linktype(proto)
switch (proto) {
case ETHERTYPE_IP:
proto = PPP_IP; /* XXX was 0x21 */
proto = PPP_IP;
break;
#ifdef INET6
@ -1679,6 +1698,10 @@ gen_llc(proto)
*/
switch (proto) {
case LLCSAP_IP:
return gen_cmp(off_linktype, BPF_H, (long)
((LLCSAP_IP << 8) | LLCSAP_IP));
case LLCSAP_ISONS:
return gen_cmp(off_linktype, BPF_H, (long)
((LLCSAP_ISONS << 8) | LLCSAP_ISONS));
@ -2950,8 +2973,19 @@ gen_port(port, ip_proto, dir)
{
struct block *b0, *b1, *tmp;
/* ether proto ip */
b0 = gen_linktype(ETHERTYPE_IP);
switch (linktype) {
case DLT_IEEE802_11:
case DLT_PRISM_HEADER:
case DLT_FDDI:
case DLT_IEEE802:
case DLT_ATM_RFC1483:
case DLT_ATM_CLIP:
b0 = gen_linktype(LLCSAP_IP);
break;
default:
b0 = gen_linktype(ETHERTYPE_IP);
break;
}
switch (ip_proto) {
case IPPROTO_UDP:
@ -3415,7 +3449,19 @@ gen_proto(v, proto, dir)
/*FALLTHROUGH*/
#endif
case Q_IP:
b0 = gen_linktype(ETHERTYPE_IP);
switch (linktype) {
case DLT_IEEE802_11:
case DLT_PRISM_HEADER:
case DLT_FDDI:
case DLT_IEEE802:
case DLT_ATM_RFC1483:
case DLT_ATM_CLIP:
b0 = gen_linktype(LLCSAP_IP);
break;
default:
b0 = gen_linktype(ETHERTYPE_IP);
break;
}
#ifndef CHASE_CHAIN
b1 = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)v);
#else
@ -3449,6 +3495,13 @@ gen_proto(v, proto, dir)
return gen_cmp(2, BPF_H, (0x03<<8) | v);
break;
case DLT_C_HDLC:
/* Cisco uses an Ethertype lookalike - for OSI its 0xfefe */
b0 = gen_linktype(LLCSAP_ISONS<<8 | LLCSAP_ISONS);
/* OSI in C-HDLC is stuffed with a fudge byte */
b1 = gen_cmp(off_nl_nosnap+1, BPF_B, (long)v);
gen_and(b0, b1);
return b1;
default:
b0 = gen_linktype(LLCSAP_ISONS);
b1 = gen_cmp(off_nl_nosnap, BPF_B, (long)v);