/* * Copyright (c) 1994, 1995, 1996, 1997 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code distributions * retain the above copyright notice and this paragraph in its entirety, (2) * distributions including binary code include the above copyright notice and * this paragraph in its entirety in the documentation or other materials * provided with the distribution, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: * ``This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of * the University nor the names of its contributors may be used to endorse * or promote products derived from this software without specific prior * written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * $FreeBSD$ */ #ifndef lint static const char rcsid[] _U_ = "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.33.2.2 2003/11/16 08:51:11 guy Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include "interface.h" #include "extract.h" #include "addrtoname.h" #include "ethertype.h" #include "atm.h" #include "atmuni31.h" #include "llc.h" #include "ether.h" /* * Print an RFC 1483 LLC-encapsulated ATM frame. */ static void atm_llc_print(const u_char *p, int length, int caplen) { u_short extracted_ethertype; if (!llc_print(p, length, caplen, NULL, NULL, &extracted_ethertype)) { /* ether_type not known, print raw packet */ if (extracted_ethertype) { printf("(LLC %s) ", etherproto_string(htons(extracted_ethertype))); } if (!xflag && !qflag) default_print(p, 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. */ u_int atm_if_print(const struct pcap_pkthdr *h, const u_char *p) { u_int caplen = h->caplen; u_int length = h->len; u_int32_t llchdr; u_int hdrlen = 0; if (caplen < 8) { printf("[|atm]"); return (caplen); } /* * 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. */ 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. * * 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("%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); return (hdrlen); } /* * ATM signalling. */ static struct tok msgtype2str[] = { { CALL_PROCEED, "Call_proceeding" }, { CONNECT, "Connect" }, { CONNECT_ACK, "Connect_ack" }, { SETUP, "Setup" }, { RELEASE, "Release" }, { RELEASE_DONE, "Release_complete" }, { RESTART, "Restart" }, { RESTART_ACK, "Restart_ack" }, { STATUS, "Status" }, { STATUS_ENQ, "Status_enquiry" }, { ADD_PARTY, "Add_party" }, { ADD_PARTY_ACK, "Add_party_ack" }, { ADD_PARTY_REJ, "Add_party_reject" }, { DROP_PARTY, "Drop_party" }, { DROP_PARTY_ACK, "Drop_party_ack" }, { 0, NULL } }; static void sig_print(const u_char *p, int caplen) { bpf_u_int32 call_ref; if (caplen < PROTO_POS) { printf("[|atm]"); return; } if (p[PROTO_POS] == Q2931) { /* * protocol:Q.2931 for User to Network Interface * (UNI 3.1) signalling */ printf("Q.2931"); if (caplen < MSG_TYPE_POS) { printf(" [|atm]"); return; } printf(":%s ", tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS])); if (caplen < CALL_REF_POS+3) { printf("[|atm]"); return; } call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]); printf("CALL_REF:0x%06x", call_ref); } else { /* SCCOP with some unknown protocol atop it */ printf("SSCOP, proto %d ", p[PROTO_POS]); } } /* * Print an ATM PDU (such as an AAL5 PDU). */ void atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length, u_int caplen) { if (eflag) printf("VPI:%u VCI:%u ", vpi, vci); if (vpi == 0) { switch (vci) { case PPC: sig_print(p, caplen); return; case BCC: printf("broadcast sig: "); return; case OAMF4SC: printf("oamF4(segment): "); return; case OAMF4EC: printf("oamF4(end): "); return; case METAC: printf("meta: "); return; case ILMIC: printf("ilmi: "); snmp_print(p, length); return; } } switch (traftype) { case ATM_LLC: default: /* * Assumes traffic is LLC if unknown. */ atm_llc_print(p, length, caplen); break; case ATM_LANE: lane_print(p, length, caplen); break; } }