* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.24 2002-07-11 09:17:23 guy Exp $ (LBL)";
+static const char rcsid[] _U_ =
+ "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.35 2003-11-16 09:36:13 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/socket.h>
-
-#include <netinet/in.h>
+#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <pcap.h>
#include "ethertype.h"
#include "atm.h"
#include "atmuni31.h"
+#include "llc.h"
#include "ether.h"
static void
atm_llc_print(const u_char *p, int length, int caplen)
{
- struct ether_header ehdr;
- u_short ether_type;
u_short extracted_ethertype;
- ether_type = p[6] << 8 | p[7];
-
- /*
- * Fake up an Ethernet header for the benefit of printers that
- * insist on "packetp" pointing to an Ethernet header.
- */
- memset(&ehdr, '\0', sizeof ehdr);
-
- /*
- * Some printers want to get back at the ethernet addresses.
- * Rather than pass it all the way down, we set this global.
- *
- * Actually, the only printers that use packetp are print-arp.c
- * and print-bootp.c, and they assume that packetp points to an
- * Ethernet header. The right thing to do is to fix them to know
- * which link type is in use when they excavate. XXX
- */
- packetp = (u_char *)&ehdr;
-
- if (!llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
+ if (!llc_print(p, length, caplen, NULL, NULL,
&extracted_ethertype)) {
/* ether_type not known, print raw packet */
if (extracted_ethertype) {
}
/*
- * This is the top level routine of the printer. 'p' is the points
- * to the LLC/SNAP header of the packet, 'tvp' is the timestamp,
- * 'length' is the length of the packet off the wire, and 'caplen'
+ * Given a SAP value, generate the LLC header value for a UI packet
+ * with that SAP as the source and destination SAP.
+ */
+#define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03)
+
+/*
+ * This is the top level routine of the printer. 'p' points
+ * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
+ * 'h->length' is the length of the packet off the wire, and 'h->caplen'
* is the number of bytes actually captured.
*/
-void
-atm_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
+u_int
+atm_if_print(const struct pcap_pkthdr *h, const u_char *p)
{
u_int caplen = h->caplen;
u_int length = h->len;
-
- ++infodelay;
- ts_print(&h->ts);
+ u_int32_t llchdr;
+ u_int hdrlen = 0;
if (caplen < 8) {
printf("[|atm]");
- goto out;
+ return (caplen);
}
/*
- * Some printers want to check that they're not walking off the
- * end of the packet.
- * Rather than pass it all the way down, we set this global.
+ * Extract the presumed LLC header into a variable, for quick
+ * testing.
+ * Then check for a header that's neither a header for a SNAP
+ * packet nor an RFC 2684 routed NLPID-formatted PDU nor
+ * an 802.2-but-no-SNAP IP packet.
*/
- snapend = p + caplen;
-
- if (p[0] != 0xaa || p[1] != 0xaa || p[2] != 0x03) {
+ llchdr = EXTRACT_24BITS(p);
+ if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
+ llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
+ llchdr != LLC_UI_HDR(LLCSAP_IP)) {
/*
* XXX - assume 802.6 MAC header from Fore driver.
- * XXX - should we also assume it's not a MAC header
- * if it begins with 0xfe 0xfe 0x03, for RFC 2684
- * routed NLPID-formatted PDUs?
+ *
+ * Unfortunately, the above list doesn't check for
+ * all known SAPs, doesn't check for headers where
+ * the source and destination SAP aren't the same,
+ * and doesn't check for non-UI frames. It also
+ * runs the risk of an 802.6 MAC header that happens
+ * to begin with one of those values being
+ * incorrectly treated as an 802.2 header.
+ *
+ * So is that Fore driver still around? And, if so,
+ * is it still putting 802.6 MAC headers on ATM
+ * packets? If so, could it be changed to use a
+ * new DLT_IEEE802_6 value if we added it?
*/
if (eflag)
- printf("%04x%04x %04x%04x ",
- p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3],
- p[4] << 24 | p[5] << 16 | p[6] << 8 | p[7],
- p[8] << 24 | p[9] << 16 | p[10] << 8 | p[11],
- p[12] << 24 | p[13] << 16 | p[14] << 8 | p[15]);
+ printf("%08x%08x %08x%08x ",
+ EXTRACT_32BITS(p),
+ EXTRACT_32BITS(p+4),
+ EXTRACT_32BITS(p+8),
+ EXTRACT_32BITS(p+12));
p += 20;
length -= 20;
caplen -= 20;
+ hdrlen += 20;
}
atm_llc_print(p, length, caplen);
- if (xflag)
- default_print(p, caplen);
- out:
- putchar('\n');
+ return (hdrlen);
}
/*
if (eflag)
printf("VPI:%u VCI:%u ", vpi, vci);
- /*
- * Some printers want to check that they're not walking off the
- * end of the packet.
- * Rather than pass it all the way down, we set this global.
- */
- snapend = p + caplen;
-
if (vpi == 0) {
switch (vci) {
case PPC:
sig_print(p, caplen);
- goto out;
+ return;
case BCC:
printf("broadcast sig: ");
- goto out;
+ return;
case OAMF4SC:
printf("oamF4(segment): ");
- goto out;
+ return;
case OAMF4EC:
printf("oamF4(end): ");
- goto out;
+ return;
case METAC:
printf("meta: ");
- goto out;
+ return;
case ILMIC:
printf("ilmi: ");
snmp_print(p, length);
- goto out;
+ return;
}
}
lane_print(p, length, caplen);
break;
}
-
-out:
- if (xflag)
- default_print(p, caplen);
}
projects / tcpdump / blobdiff