1b0453382SBill Fenner /* 2b0453382SBill Fenner * Marko Kiiskila carnil@cs.tut.fi 3b0453382SBill Fenner * 4b0453382SBill Fenner * Tampere University of Technology - Telecommunications Laboratory 5b0453382SBill Fenner * 6b0453382SBill Fenner * Permission to use, copy, modify and distribute this 7b0453382SBill Fenner * software and its documentation is hereby granted, 8b0453382SBill Fenner * provided that both the copyright notice and this 9b0453382SBill Fenner * permission notice appear in all copies of the software, 10b0453382SBill Fenner * derivative works or modified versions, and any portions 11b0453382SBill Fenner * thereof, that both notices appear in supporting 12b0453382SBill Fenner * documentation, and that the use of this software is 13b0453382SBill Fenner * acknowledged in any publications resulting from using 14b0453382SBill Fenner * the software. 15b0453382SBill Fenner * 16b0453382SBill Fenner * TUT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 17b0453382SBill Fenner * CONDITION AND DISCLAIMS ANY LIABILITY OF ANY KIND FOR 18b0453382SBill Fenner * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS 19b0453382SBill Fenner * SOFTWARE. 20b0453382SBill Fenner * 21b0453382SBill Fenner */ 22b0453382SBill Fenner 23*ee67461eSJoseph Mingrone /* \summary: Linux Classical IP over ATM printer */ 243340d773SGleb Smirnoff 25*ee67461eSJoseph Mingrone #include <config.h> 26b0453382SBill Fenner 27a90e161bSBill Fenner #include <string.h> 28a90e161bSBill Fenner 29*ee67461eSJoseph Mingrone #include "netdissect-stdinc.h" 30b0453382SBill Fenner 31*ee67461eSJoseph Mingrone #define ND_LONGJMP_FROM_TCHECK 323340d773SGleb Smirnoff #include "netdissect.h" 33b0453382SBill Fenner #include "addrtoname.h" 34b0453382SBill Fenner 353c602fabSXin LI static const unsigned char rfcllc[] = { 36b0453382SBill Fenner 0xaa, /* DSAP: non-ISO */ 37b0453382SBill Fenner 0xaa, /* SSAP: non-ISO */ 38b0453382SBill Fenner 0x03, /* Ctrl: Unnumbered Information Command PDU */ 39b0453382SBill Fenner 0x00, /* OUI: EtherType */ 40b0453382SBill Fenner 0x00, 41b0453382SBill Fenner 0x00 }; 42b0453382SBill Fenner 43b0453382SBill Fenner /* 445b0fe478SBruce M Simpson * This is the top level routine of the printer. 'p' points 455b0fe478SBruce M Simpson * to the LLC/SNAP or raw header of the packet, 'h->ts' is the timestamp, 461de50e9fSSam Leffler * 'h->len' is the length of the packet off the wire, and 'h->caplen' 47b0453382SBill Fenner * is the number of bytes actually captured. 48b0453382SBill Fenner */ 49*ee67461eSJoseph Mingrone void 503c602fabSXin LI cip_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) 51b0453382SBill Fenner { 52a90e161bSBill Fenner u_int caplen = h->caplen; 53a90e161bSBill Fenner u_int length = h->len; 543340d773SGleb Smirnoff int llc_hdrlen; 55b0453382SBill Fenner 56*ee67461eSJoseph Mingrone ndo->ndo_protocol = "cip"; 57b0453382SBill Fenner 583c602fabSXin LI if (ndo->ndo_eflag) 59*ee67461eSJoseph Mingrone /* 60*ee67461eSJoseph Mingrone * There is no MAC-layer header, so just print the length. 61*ee67461eSJoseph Mingrone */ 62*ee67461eSJoseph Mingrone ND_PRINT("%u: ", length); 63b0453382SBill Fenner 64*ee67461eSJoseph Mingrone ND_TCHECK_LEN(p, sizeof(rfcllc)); 65*ee67461eSJoseph Mingrone if (memcmp(rfcllc, p, sizeof(rfcllc)) == 0) { 66b0453382SBill Fenner /* 67a90e161bSBill Fenner * LLC header is present. Try to print it & higher layers. 68b0453382SBill Fenner */ 693340d773SGleb Smirnoff llc_hdrlen = llc_print(ndo, p, length, caplen, NULL, NULL); 703340d773SGleb Smirnoff if (llc_hdrlen < 0) { 713340d773SGleb Smirnoff /* packet type not known, print raw packet */ 723c602fabSXin LI if (!ndo->ndo_suppress_default_print) 733c602fabSXin LI ND_DEFAULTPRINT(p, caplen); 743340d773SGleb Smirnoff llc_hdrlen = -llc_hdrlen; 75b0453382SBill Fenner } 76a90e161bSBill Fenner } else { 77a90e161bSBill Fenner /* 78a90e161bSBill Fenner * LLC header is absent; treat it as just IP. 79a90e161bSBill Fenner */ 803340d773SGleb Smirnoff llc_hdrlen = 0; 813c602fabSXin LI ip_print(ndo, p, length); 82b0453382SBill Fenner } 83a90e161bSBill Fenner 84*ee67461eSJoseph Mingrone ndo->ndo_ll_hdr_len += llc_hdrlen; 85b0453382SBill Fenner } 86