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      1 /*
      2  * Copyright (c) 1994, 1995, 1996, 1997
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that: (1) source code distributions
      7  * retain the above copyright notice and this paragraph in its entirety, (2)
      8  * distributions including binary code include the above copyright notice and
      9  * this paragraph in its entirety in the documentation or other materials
     10  * provided with the distribution, and (3) all advertising materials mentioning
     11  * features or use of this software display the following acknowledgement:
     12  * ``This product includes software developed by the University of California,
     13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
     14  * the University nor the names of its contributors may be used to endorse
     15  * or promote products derived from this software without specific prior
     16  * written permission.
     17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
     18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
     19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     20  */
     21 #ifndef lint
     22 static const char rcsid[] _U_ =
     23     "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.38.2.6 2006/01/25 13:27:24 hannes Exp $ (LBL)";
     24 #endif
     25 
     26 #ifdef HAVE_CONFIG_H
     27 #include "config.h"
     28 #endif
     29 
     30 #include <tcpdump-stdinc.h>
     31 
     32 #include <stdio.h>
     33 #include <pcap.h>
     34 #include <string.h>
     35 
     36 #include "interface.h"
     37 #include "extract.h"
     38 #include "addrtoname.h"
     39 #include "ethertype.h"
     40 #include "atm.h"
     41 #include "atmuni31.h"
     42 #include "llc.h"
     43 
     44 #include "ether.h"
     45 
     46 struct tok oam_f_values[] = {
     47     { OAMF4SC, "OAM F4 (segment)" },
     48     { OAMF4EC, "OAM F4 (end)" },
     49     { 0, NULL }
     50 };
     51 
     52 struct tok oam_celltype_values[] = {
     53     { 0x1, "Fault Management" },
     54     { 0x2, "Performance Management" },
     55     { 0x8, "activate/deactivate" },
     56     { 0xf, "System Management" },
     57     { 0, NULL }
     58 };
     59 
     60 struct tok oam_fm_functype_values[] = {
     61     { 0x0, "AIS" },
     62     { 0x1, "RDI" },
     63     { 0x4, "Continuity Check" },
     64     { 0x8, "Loopback" },
     65     { 0, NULL }
     66 };
     67 
     68 struct tok oam_pm_functype_values[] = {
     69     { 0x0, "Forward Monitoring" },
     70     { 0x1, "Backward Reporting" },
     71     { 0x2, "Monitoring and Reporting" },
     72     { 0, NULL }
     73 };
     74 
     75 struct tok oam_ad_functype_values[] = {
     76     { 0x0, "Performance Monitoring" },
     77     { 0x1, "Continuity Check" },
     78     { 0, NULL }
     79 };
     80 
     81 static const struct tok *oam_functype_values[16] = {
     82     NULL,
     83     oam_fm_functype_values, /* 1 */
     84     oam_pm_functype_values, /* 2 */
     85     NULL,
     86     NULL,
     87     NULL,
     88     NULL,
     89     NULL,
     90     oam_ad_functype_values, /* 8 */
     91     NULL,
     92     NULL,
     93     NULL,
     94     NULL,
     95     NULL,
     96     NULL,
     97     NULL
     98 };
     99 
    100 /*
    101  * Print an RFC 1483 LLC-encapsulated ATM frame.
    102  */
    103 static void
    104 atm_llc_print(const u_char *p, int length, int caplen)
    105 {
    106 	u_short extracted_ethertype;
    107 
    108 	if (!llc_print(p, length, caplen, NULL, NULL,
    109 	    &extracted_ethertype)) {
    110 		/* ether_type not known, print raw packet */
    111 		if (extracted_ethertype) {
    112 			printf("(LLC %s) ",
    113 		etherproto_string(htons(extracted_ethertype)));
    114 		}
    115 		if (!suppress_default_print)
    116 			default_print(p, caplen);
    117 	}
    118 }
    119 
    120 /*
    121  * Given a SAP value, generate the LLC header value for a UI packet
    122  * with that SAP as the source and destination SAP.
    123  */
    124 #define LLC_UI_HDR(sap)	((sap)<<16 | (sap<<8) | 0x03)
    125 
    126 /*
    127  * This is the top level routine of the printer.  'p' points
    128  * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
    129  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
    130  * is the number of bytes actually captured.
    131  */
    132 u_int
    133 atm_if_print(const struct pcap_pkthdr *h, const u_char *p)
    134 {
    135 	u_int caplen = h->caplen;
    136 	u_int length = h->len;
    137 	u_int32_t llchdr;
    138 	u_int hdrlen = 0;
    139 
    140 	if (caplen < 8) {
    141 		printf("[|atm]");
    142 		return (caplen);
    143 	}
    144 
    145         /* Cisco Style NLPID ? */
    146         if (*p == LLC_UI) {
    147             if (eflag)
    148                 printf("CNLPID ");
    149             isoclns_print(p+1, length-1, caplen-1);
    150             return hdrlen;
    151         }
    152 
    153 	/*
    154 	 * Extract the presumed LLC header into a variable, for quick
    155 	 * testing.
    156 	 * Then check for a header that's neither a header for a SNAP
    157 	 * packet nor an RFC 2684 routed NLPID-formatted PDU nor
    158 	 * an 802.2-but-no-SNAP IP packet.
    159 	 */
    160 	llchdr = EXTRACT_24BITS(p);
    161 	if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
    162 	    llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
    163 	    llchdr != LLC_UI_HDR(LLCSAP_IP)) {
    164 		/*
    165 		 * XXX - assume 802.6 MAC header from Fore driver.
    166 		 *
    167 		 * Unfortunately, the above list doesn't check for
    168 		 * all known SAPs, doesn't check for headers where
    169 		 * the source and destination SAP aren't the same,
    170 		 * and doesn't check for non-UI frames.  It also
    171 		 * runs the risk of an 802.6 MAC header that happens
    172 		 * to begin with one of those values being
    173 		 * incorrectly treated as an 802.2 header.
    174 		 *
    175 		 * So is that Fore driver still around?  And, if so,
    176 		 * is it still putting 802.6 MAC headers on ATM
    177 		 * packets?  If so, could it be changed to use a
    178 		 * new DLT_IEEE802_6 value if we added it?
    179 		 */
    180 		if (eflag)
    181 			printf("%08x%08x %08x%08x ",
    182 			       EXTRACT_32BITS(p),
    183 			       EXTRACT_32BITS(p+4),
    184 			       EXTRACT_32BITS(p+8),
    185 			       EXTRACT_32BITS(p+12));
    186 		p += 20;
    187 		length -= 20;
    188 		caplen -= 20;
    189 		hdrlen += 20;
    190 	}
    191 	atm_llc_print(p, length, caplen);
    192 	return (hdrlen);
    193 }
    194 
    195 /*
    196  * ATM signalling.
    197  */
    198 static struct tok msgtype2str[] = {
    199 	{ CALL_PROCEED,		"Call_proceeding" },
    200 	{ CONNECT,		"Connect" },
    201 	{ CONNECT_ACK,		"Connect_ack" },
    202 	{ SETUP,		"Setup" },
    203 	{ RELEASE,		"Release" },
    204 	{ RELEASE_DONE,		"Release_complete" },
    205 	{ RESTART,		"Restart" },
    206 	{ RESTART_ACK,		"Restart_ack" },
    207 	{ STATUS,		"Status" },
    208 	{ STATUS_ENQ,		"Status_enquiry" },
    209 	{ ADD_PARTY,		"Add_party" },
    210 	{ ADD_PARTY_ACK,	"Add_party_ack" },
    211 	{ ADD_PARTY_REJ,	"Add_party_reject" },
    212 	{ DROP_PARTY,		"Drop_party" },
    213 	{ DROP_PARTY_ACK,	"Drop_party_ack" },
    214 	{ 0,			NULL }
    215 };
    216 
    217 static void
    218 sig_print(const u_char *p, int caplen)
    219 {
    220 	bpf_u_int32 call_ref;
    221 
    222 	if (caplen < PROTO_POS) {
    223 		printf("[|atm]");
    224 		return;
    225 	}
    226 	if (p[PROTO_POS] == Q2931) {
    227 		/*
    228 		 * protocol:Q.2931 for User to Network Interface
    229 		 * (UNI 3.1) signalling
    230 		 */
    231 		printf("Q.2931");
    232 		if (caplen < MSG_TYPE_POS) {
    233 			printf(" [|atm]");
    234 			return;
    235 		}
    236 		printf(":%s ",
    237 		    tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]));
    238 
    239 		if (caplen < CALL_REF_POS+3) {
    240 			printf("[|atm]");
    241 			return;
    242 		}
    243 		call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
    244 		printf("CALL_REF:0x%06x", call_ref);
    245 	} else {
    246 		/* SCCOP with some unknown protocol atop it */
    247 		printf("SSCOP, proto %d ", p[PROTO_POS]);
    248 	}
    249 }
    250 
    251 /*
    252  * Print an ATM PDU (such as an AAL5 PDU).
    253  */
    254 void
    255 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
    256     u_int caplen)
    257 {
    258 	if (eflag)
    259 		printf("VPI:%u VCI:%u ", vpi, vci);
    260 
    261 	if (vpi == 0) {
    262 		switch (vci) {
    263 
    264 		case PPC:
    265 			sig_print(p, caplen);
    266 			return;
    267 
    268 		case BCC:
    269 			printf("broadcast sig: ");
    270 			return;
    271 
    272 		case OAMF4SC: /* fall through */
    273 		case OAMF4EC:
    274                         oam_print(p, length, ATM_OAM_HEC);
    275 			return;
    276 
    277 		case METAC:
    278 			printf("meta: ");
    279 			return;
    280 
    281 		case ILMIC:
    282 			printf("ilmi: ");
    283 			snmp_print(p, length);
    284 			return;
    285 		}
    286 	}
    287 
    288 	switch (traftype) {
    289 
    290 	case ATM_LLC:
    291 	default:
    292 		/*
    293 		 * Assumes traffic is LLC if unknown.
    294 		 */
    295 		atm_llc_print(p, length, caplen);
    296 		break;
    297 
    298 	case ATM_LANE:
    299 		lane_print(p, length, caplen);
    300 		break;
    301 	}
    302 }
    303 
    304 int
    305 oam_print (const u_char *p, u_int length, u_int hec) {
    306 
    307     u_int32_t cell_header;
    308     u_int16_t cell_type, func_type,vpi,vci,payload,clp;
    309 
    310     cell_header = EXTRACT_32BITS(p+hec);
    311     cell_type = ((*(p+4+hec))>>4) & 0x0f;
    312     func_type = *(p+4+hec) & 0x0f;
    313 
    314     vpi = (cell_header>>20)&0xff;
    315     vci = (cell_header>>4)&0xffff;
    316     payload = (cell_header>>1)&0x7;
    317     clp = cell_header&0x1;
    318 
    319     printf("%s, vpi %u, vci %u, payload %u, clp %u, ",
    320            tok2str(oam_f_values, "OAM F5", vci),
    321            vpi, vci, payload, clp);
    322 
    323     printf("cell-type %s (%u)",
    324            tok2str(oam_celltype_values, "unknown", cell_type),
    325            cell_type);
    326 
    327     if (oam_functype_values[cell_type] == NULL)
    328         printf(", func-type unknown (%u)", func_type);
    329     else
    330         printf(", func-type %s (%u)",
    331                bittok2str(oam_functype_values[cell_type],"none",func_type),
    332                func_type);
    333 
    334     printf(", length %u",length);
    335     return 1;
    336 }
    337