/* $NetBSD: print-fr.c,v 1.1.1.1 2004/09/27 17:07:03 dyoung Exp $ */ /* * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996 * 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. */ #ifndef lint static const char rcsid[] _U_ = "@(#)Header: /tcpdump/master/tcpdump/print-fr.c,v 1.17.2.3 2003/12/15 03:37:45 guy Exp (LBL)"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include "addrtoname.h" #include "interface.h" #include "ethertype.h" #include "extract.h" static void lmi_print(const u_char *, u_int); #define NLPID_LMI 0x08 /* ANSI T1.617 Annex D or ITU-T Q.933 Annex A */ #define NLPID_CISCO_LMI 0x09 /* The original, aka Cisco, aka Gang of Four */ #define NLPID_SNAP 0x80 #define NLPID_CLNP 0x81 #define NLPID_ESIS 0x82 #define NLPID_ISIS 0x83 #define NLPID_CONS 0x84 #define NLPID_IDRP 0x85 #define NLPID_X25_ESIS 0x8a #define NLPID_IPV6 0x8e #define NLPID_IP 0xcc #define FR_EA_BIT 0x01 /* Finds out Q.922 address length, DLCI and flags. Returns 0 on success */ static int parse_q922_addr(const u_char *p, u_int *dlci, u_int *addr_len, char **flags_ptr) { static char flags[32]; size_t len; if ((p[0] & FR_EA_BIT)) return -1; *flags_ptr = flags; *addr_len = 2; *dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4); strcpy(flags, (p[0] & 0x02) ? "C!, " : ""); if (p[1] & 0x08) strcat(flags, "FECN, "); if (p[1] & 0x04) strcat(flags, "BECN, "); if (p[1] & 0x02) strcat(flags, "DE, "); len = strlen(flags); if (len > 1) flags[len - 2] = '\x0'; /* delete trailing comma and space */ if (p[1] & FR_EA_BIT) return 0; /* 2-byte Q.922 address */ p += 2; (*addr_len)++; /* 3- or 4-byte Q.922 address */ if ((p[0] & FR_EA_BIT) == 0) { *dlci = (*dlci << 7) | (p[0] >> 1); (*addr_len)++; /* 4-byte Q.922 address */ p++; } if ((p[0] & FR_EA_BIT) == 0) return -1; /* more than 4 bytes of Q.922 address? */ if (p[0] & 0x02) { len = strlen(flags); snprintf(flags + len, sizeof(flags) - len, "%sdlcore %x", len ? ", " : "", p[0] >> 2); } else *dlci = (*dlci << 6) | (p[0] >> 2); return 0; } static const char *fr_nlpids[256]; static void init_fr_nlpids(void) { int i; static int fr_nlpid_flag = 0; if (!fr_nlpid_flag) { for (i=0; i < 256; i++) fr_nlpids[i] = NULL; fr_nlpids[NLPID_LMI] = "LMI"; fr_nlpids[NLPID_CISCO_LMI] = "Cisco LMI"; fr_nlpids[NLPID_SNAP] = "SNAP"; fr_nlpids[NLPID_CLNP] = "CLNP"; fr_nlpids[NLPID_ESIS] = "ESIS"; fr_nlpids[NLPID_ISIS] = "ISIS"; fr_nlpids[NLPID_CONS] = "CONS"; fr_nlpids[NLPID_IDRP] = "IDRP"; fr_nlpids[NLPID_X25_ESIS] = "X25_ESIS"; fr_nlpids[NLPID_IP] = "IP"; } fr_nlpid_flag = 1; } /* Frame Relay packet structure, with flags and CRC removed +---------------------------+ | Q.922 Address* | +-- --+ | | +---------------------------+ | Control (UI = 0x03) | +---------------------------+ | Optional Pad (0x00) | +---------------------------+ | NLPID | +---------------------------+ | . | | . | | . | | Data | | . | | . | +---------------------------+ * Q.922 addresses, as presently defined, are two octets and contain a 10-bit DLCI. In some networks Q.922 addresses may optionally be increased to three or four octets. */ static u_int fr_hdrlen(const u_char *p, u_int addr_len, u_int caplen) { if ((caplen > addr_len + 1 /* UI */ + 1 /* pad */) && !p[addr_len + 1] /* pad exist */) return addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */; else return addr_len + 1 /* UI */ + 1 /* NLPID */; } static const char * fr_protostring(u_int8_t proto) { static char buf[5+1+2+1]; init_fr_nlpids(); if (nflag || fr_nlpids[proto] == NULL) { snprintf(buf, sizeof(buf), "proto %02x", proto); return buf; } return fr_nlpids[proto]; } static void fr_hdr_print(int length, u_int dlci, char *flags, u_char nlpid) { if (qflag) (void)printf("DLCI %u, %s%slength %d: ", dlci, flags, *flags ? ", " : "", length); else (void)printf("DLCI %u, %s%s%s, length %d: ", dlci, flags, *flags ? ", " : "", fr_protostring(nlpid), length); } u_int fr_if_print(const struct pcap_pkthdr *h, register const u_char *p) { register u_int length = h->len; register u_int caplen = h->caplen; u_short extracted_ethertype; u_int32_t orgcode; register u_short et; u_int dlci; int addr_len; u_char nlpid; u_int hdr_len; char *flags; if (caplen < 4) { /* minimum frame header length */ printf("[|fr]"); return caplen; } if (parse_q922_addr(p, &dlci, &addr_len, &flags)) { printf("Invalid Q.922 address"); return caplen; } hdr_len = fr_hdrlen(p, addr_len, caplen); if (caplen < hdr_len) { printf("[|fr]"); return caplen; } if (p[addr_len] != 0x03) printf("UI %02x! ", p[addr_len]); if (!p[addr_len + 1]) { /* pad byte should be used with 3-byte Q.922 */ if (addr_len != 3) printf("Pad! "); } else if (addr_len == 3) printf("No pad! "); nlpid = p[hdr_len - 1]; p += hdr_len; length -= hdr_len; caplen -= hdr_len; if (eflag) fr_hdr_print(length, dlci, flags, nlpid); switch (nlpid) { case NLPID_IP: ip_print(p, length); break; #ifdef INET6 case NLPID_IPV6: ip6_print(p, length); break; #endif case NLPID_CLNP: case NLPID_ESIS: case NLPID_ISIS: isoclns_print(p, length, caplen); break; case NLPID_SNAP: orgcode = EXTRACT_24BITS(p); et = EXTRACT_16BITS(p + 3); if (snap_print((const u_char *)(p + 5), length - 5, caplen - 5, &extracted_ethertype, orgcode, et, 0) == 0) { /* ether_type not known, print raw packet */ if (!eflag) fr_hdr_print(length + hdr_len, dlci, flags, nlpid); if (extracted_ethertype) { printf("(SNAP %s) ", etherproto_string(htons(extracted_ethertype))); } if (!xflag && !qflag) default_print(p - hdr_len, caplen + hdr_len); } break; case NLPID_LMI: lmi_print(p, length); break; default: if (!eflag) fr_hdr_print(length + hdr_len, dlci, flags, nlpid); if (!xflag) default_print(p, caplen); } return hdr_len; } /* * Q.933 decoding portion for framerelay specific. */ /* Q.933 packet format Format of Other Protocols using Q.933 NLPID +-------------------------------+ | Q.922 Address | +---------------+---------------+ |Control 0x03 | NLPID 0x08 | +---------------+---------------+ | L2 Protocol ID | | octet 1 | octet 2 | +-------------------------------+ | L3 Protocol ID | | octet 2 | octet 2 | +-------------------------------+ | Protocol Data | +-------------------------------+ | FCS | +-------------------------------+ */ /* L2 (Octet 1)- Call Reference Usually is 0x0 */ /* * L2 (Octet 2)- Message Types definition 1 byte long. */ /* Call Establish */ #define MSG_TYPE_ESC_TO_NATIONAL 0x00 #define MSG_TYPE_ALERT 0x01 #define MSG_TYPE_CALL_PROCEEDING 0x02 #define MSG_TYPE_CONNECT 0x07 #define MSG_TYPE_CONNECT_ACK 0x0F #define MSG_TYPE_PROGRESS 0x03 #define MSG_TYPE_SETUP 0x05 /* Call Clear */ #define MSG_TYPE_DISCONNECT 0x45 #define MSG_TYPE_RELEASE 0x4D #define MSG_TYPE_RELEASE_COMPLETE 0x5A #define MSG_TYPE_RESTART 0x46 #define MSG_TYPE_RESTART_ACK 0x4E /* Status */ #define MSG_TYPE_STATUS 0x7D #define MSG_TYPE_STATUS_ENQ 0x75 #define MSG_ANSI_LOCKING_SHIFT 0x95 #define ONE_BYTE_IE_MASK 0xF0 /* details? */ #define ANSI_REPORT_TYPE_IE 0x01 #define ANSI_LINK_VERIFY_IE_91 0x19 /* details? */ #define ANSI_LINK_VERIFY_IE 0x03 #define ANSI_PVC_STATUS_IE 0x07 #define CCITT_REPORT_TYPE_IE 0x51 #define CCITT_LINK_VERIFY_IE 0x53 #define CCITT_PVC_STATUS_IE 0x57 struct common_ie_header { u_int8_t ie_id; u_int8_t ie_len; }; #define FULL_STATUS 0 #define LINK_VERIFY 1 #define ASYNC_PVC 2 /* Parses DLCI information element. */ static const char * parse_dlci_ie(const u_char *p, u_int ie_len, char *buffer, size_t buffer_len) { u_int dlci; if ((ie_len < 3) || (p[0] & 0x80) || ((ie_len == 3) && !(p[1] & 0x80)) || ((ie_len == 4) && ((p[1] & 0x80) || !(p[2] & 0x80))) || ((ie_len == 5) && ((p[1] & 0x80) || (p[2] & 0x80) || !(p[3] & 0x80))) || (ie_len > 5) || !(p[ie_len - 1] & 0x80)) return "Invalid DLCI IE"; dlci = ((p[0] & 0x3F) << 4) | ((p[1] & 0x78) >> 3); if (ie_len == 4) dlci = (dlci << 6) | ((p[2] & 0x7E) >> 1); else if (ie_len == 5) dlci = (dlci << 13) | (p[2] & 0x7F) | ((p[3] & 0x7E) >> 1); snprintf(buffer, buffer_len, "DLCI %d: status %s%s", dlci, p[ie_len - 1] & 0x8 ? "New, " : "", p[ie_len - 1] & 0x2 ? "Active" : "Inactive"); return buffer; } static void lmi_print(const u_char *p, u_int length) { const u_char *ptemp = p; const char *decode_str; char temp_str[255]; struct common_ie_header *ie_p; int is_ansi = 0; if (length < 9) { /* shortest: Q.933a LINK VERIFY */ printf("[|lmi]"); return; } if (p[2] == MSG_ANSI_LOCKING_SHIFT) is_ansi = 1; /* printing out header part */ printf(is_ansi ? "ANSI" : "CCITT"); if (p[0]) printf(" Call Ref: %02x!", p[0]); switch(p[1]) { case MSG_TYPE_STATUS: printf(" STATUS REPLY\n"); break; case MSG_TYPE_STATUS_ENQ: printf(" STATUS ENQUIRY\n"); break; default: printf(" UNKNOWN MSG Type %02x\n", p[1]); break; } if (length < (u_int)(2 - is_ansi)) { printf("[|lmi]"); return; } length -= 2 - is_ansi; ptemp += 2 + is_ansi; /* Loop through the rest of IE */ while (length > 0) { ie_p = (struct common_ie_header *)ptemp; if (length < sizeof(struct common_ie_header) || length < sizeof(struct common_ie_header) + ie_p->ie_len) { printf("[|lmi]"); return; } if ((is_ansi && ie_p->ie_id == ANSI_REPORT_TYPE_IE) || (!is_ansi && ie_p->ie_id == CCITT_REPORT_TYPE_IE)) { switch(ptemp[2]) { case FULL_STATUS: decode_str = "FULL STATUS"; break; case LINK_VERIFY: decode_str = "LINK VERIFY"; break; case ASYNC_PVC: decode_str = "Async PVC Status"; break; default: decode_str = "Reserved Value"; break; } } else if ((is_ansi && (ie_p->ie_id == ANSI_LINK_VERIFY_IE_91 || ie_p->ie_id == ANSI_LINK_VERIFY_IE)) || (!is_ansi && ie_p->ie_id == CCITT_LINK_VERIFY_IE)) { snprintf(temp_str, sizeof(temp_str), "TX Seq: %3d, RX Seq: %3d", ptemp[2], ptemp[3]); decode_str = temp_str; } else if ((is_ansi && ie_p->ie_id == ANSI_PVC_STATUS_IE) || (!is_ansi && ie_p->ie_id == CCITT_PVC_STATUS_IE)) { decode_str = parse_dlci_ie(ptemp + 2, ie_p->ie_len, temp_str, sizeof(temp_str)); } else decode_str = "Non-decoded Value"; printf("\t\tIE: %02X Len: %d, %s\n", ie_p->ie_id, ie_p->ie_len, decode_str); length = length - ie_p->ie_len - 2; ptemp = ptemp + ie_p->ie_len + 2; } }