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add baseline support for MPLS protocol and per-label filtering

This commit is contained in:
hannes 2004-06-16 08:20:28 +00:00
parent 93306079a3
commit 405ab1a931
6 changed files with 89 additions and 8 deletions
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8
ethertype.h
View File

@ -18,7 +18,7 @@
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* @(#) $Header: /tcpdump/master/libpcap/ethertype.h,v 1.12 2001-01-14 21:26:52 guy Exp $ (LBL)
* @(#) $Header: /tcpdump/master/libpcap/ethertype.h,v 1.13 2004-06-16 08:20:28 hannes Exp $ (LBL)
*/
/*
@ -102,6 +102,12 @@
#ifndef ETHERTYPE_IPV6
#define ETHERTYPE_IPV6 0x86dd
#endif
#ifndef ETHERTYPE_MPLS
#define ETHERTYPE_MPLS 0x8847
#endif
#ifndef ETHERTYPE_MPLS_MULTI
#define ETHERTYPE_MPLS_MULTI 0x8848
#endif
#ifndef ETHERTYPE_LOOPBACK
#define ETHERTYPE_LOOPBACK 0x9000
#endif

72
gencode.c
View File

@ -21,7 +21,7 @@
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.204 2004-04-07 18:43:29 guy Exp $ (LBL)";
"@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.205 2004-06-16 08:20:29 hannes Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
@ -97,7 +97,7 @@ static const char rcsid[] _U_ =
static jmp_buf top_ctx;
static pcap_t *bpf_pcap;
/* Hack for updating VLAN offsets. */
/* Hack for updating VLAN, MPLS offsets. */
static u_int orig_linktype = -1U, orig_nl = -1U, orig_nl_nosnap = -1U;
/* XXX */
@ -5279,6 +5279,74 @@ gen_vlan(vlan_num)
return (b0);
}
/*
* support for MPLS
*/
struct block *
gen_mpls(label_num)
int label_num;
{
struct block *b0;
/*
* Change the offsets to point to the type and data fields within
* the MPLS packet. This is somewhat of a kludge.
*/
if (orig_nl == (u_int)-1) {
orig_linktype = off_linktype; /* save original values */
orig_nl = off_nl;
orig_nl_nosnap = off_nl_nosnap;
switch (linktype) {
case DLT_EN10MB:
off_linktype = 16;
off_nl_nosnap = 18;
off_nl = 18;
b0 = gen_cmp(orig_linktype, BPF_H, (bpf_int32)ETHERTYPE_MPLS);
break;
case DLT_PPP:
off_linktype = 6;
off_nl_nosnap = 8;
off_nl = 8;
b0 = gen_cmp(orig_linktype, BPF_H, (bpf_int32)PPP_MPLS_UCAST);
break;
case DLT_C_HDLC:
off_linktype = 6;
off_nl_nosnap = 8;
off_nl = 8;
b0 = gen_cmp(orig_linktype, BPF_H, (bpf_int32)ETHERTYPE_MPLS);
break;
/* FIXME add other DLT_s ...
* for Frame-Relay/and ATM this may get messy due to SNAP headers
* leave it for now */
default:
bpf_error("no MPLS support for data link type %d",
linktype);
/*NOTREACHED*/
}
}
/* If a specific MPLS label is requested, check it */
if (label_num >= 0) {
struct block *b1;
label_num = label_num << 12; /* label is shifted 12 bits on the wire */
b1 = gen_mcmp(orig_nl, BPF_H, (bpf_int32)label_num, 0xfffff000); /* only compare the first 20 bits */
gen_and(b0, b1);
b0 = b1;
}
return (b0);
}
struct block *
gen_atmfield_code(atmfield, jvalue, jtype, reverse)
int atmfield;

3
gencode.h
View File

@ -18,7 +18,7 @@
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* @(#) $Header: /tcpdump/master/libpcap/gencode.h,v 1.59 2004-03-28 20:27:14 fenner Exp $ (LBL)
* @(#) $Header: /tcpdump/master/libpcap/gencode.h,v 1.60 2004-06-16 08:20:30 hannes Exp $ (LBL)
*/
/*
@ -273,6 +273,7 @@ struct block *gen_multicast(int);
struct block *gen_inbound(int);
struct block *gen_vlan(int);
struct block *gen_mpls(int);
struct block *gen_atmfield_code(int atmfield, bpf_u_int32 jvalue, bpf_u_int32 jtype, int reverse);
struct block *gen_atmtype_abbrev(int type);

6
grammar.y
View File

@ -22,7 +22,7 @@
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/libpcap/grammar.y,v 1.82 2004-03-28 20:27:14 fenner Exp $ (LBL)";
"@(#) $Header: /tcpdump/master/libpcap/grammar.y,v 1.83 2004-06-16 08:20:29 hannes Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
@ -128,7 +128,7 @@ pcap_parse()
%token LSH RSH
%token LEN
%token IPV6 ICMPV6 AH ESP
%token VLAN
%token VLAN MPLS
%token ISO ESIS CLNP ISIS L1 L2 IIH LSP SNP CSNP PSNP
%token STP
%token IPX
@ -324,6 +324,8 @@ other: pqual TK_BROADCAST { $$ = gen_broadcast($1); }
| OUTBOUND { $$ = gen_inbound(1); }
| VLAN pnum { $$ = gen_vlan($2); }
| VLAN { $$ = gen_vlan(-1); }
| MPLS pnum { $$ = gen_mpls($2); }
| MPLS { $$ = gen_mpls(-1); }
| pfvar { $$ = $1; }
;

5
ppp.h
View File

@ -1,4 +1,4 @@
/* @(#) $Header: /tcpdump/master/libpcap/ppp.h,v 1.8 1999-10-19 15:18:31 itojun Exp $ (LBL) */
/* @(#) $Header: /tcpdump/master/libpcap/ppp.h,v 1.9 2004-06-16 08:20:28 hannes Exp $ (LBL) */
/*
* Point to Point Protocol (PPP) RFC1331
*
@ -35,6 +35,8 @@
#define PPP_HELLO 0x0201 /* 802.1d Hello Packets */
#define PPP_LUXCOM 0x0231 /* Luxcom */
#define PPP_SNS 0x0233 /* Sigma Network Systems */
#define PPP_MPLS_UCAST 0x0281 /* rfc 3032 */
#define PPP_MPLS_MCAST 0x0283 /* rfc 3022 */
#define PPP_IPCP 0x8021 /* IP Control Protocol */
#define PPP_OSICP 0x8023 /* OSI Network Layer Control Protocol */
@ -45,6 +47,7 @@
#define PPP_STIICP 0x8033 /* Strean Protocol Control Protocol */
#define PPP_VINESCP 0x8035 /* Banyan Vines Control Protocol */
#define PPP_IPV6CP 0x8057 /* IPv6 Control Protocol */
#define PPP_MPLSCP 0x8281 /* rfc 3022 */
#define PPP_LCP 0xc021 /* Link Control Protocol */
#define PPP_PAP 0xc023 /* Password Authentication Protocol */

3
scanner.l
View File

@ -22,7 +22,7 @@
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/libpcap/scanner.l,v 1.98 2004-03-28 20:27:16 fenner Exp $ (LBL)";
"@(#) $Header: /tcpdump/master/libpcap/scanner.l,v 1.99 2004-06-16 08:20:28 hannes Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
@ -260,6 +260,7 @@ inbound return INBOUND;
outbound return OUTBOUND;
vlan return VLAN;
mpls return MPLS;
lane return LANE;
llc return LLC;