/* * 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 1.35 2005-04-26 07:26:34 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 "nlpid.h" #include "extract.h" #include "oui.h" static void frf15_print(const u_char *, u_int); /* * the frame relay header has a variable length * * the EA bit determines if there is another byte * in the header * * minimum header length is 2 bytes * maximum header length is 4 bytes * * 7 6 5 4 3 2 1 0 * +----+----+----+----+----+----+----+----+ * | DLCI (6 bits) | CR | EA | * +----+----+----+----+----+----+----+----+ * | DLCI (4 bits) |FECN|BECN| DE | EA | * +----+----+----+----+----+----+----+----+ * | DLCI (7 bits) | EA | * +----+----+----+----+----+----+----+----+ * | DLCI (6 bits) |SDLC| EA | * +----+----+----+----+----+----+----+----+ */ #define FR_EA_BIT 0x01 #define FR_CR_BIT 0x02000000 #define FR_DE_BIT 0x00020000 #define FR_BECN_BIT 0x00040000 #define FR_FECN_BIT 0x00080000 #define FR_SDLC_BIT 0x00000002 struct tok fr_header_flag_values[] = { { FR_CR_BIT, "C!" }, { FR_DE_BIT, "DE" }, { FR_BECN_BIT, "BECN" }, { FR_FECN_BIT, "FECN" }, { FR_SDLC_BIT, "sdlcore" }, { 0, NULL } }; /* Finds out Q.922 address length, DLCI and flags. Returns 0 on success * save the flags dep. on address length */ static int parse_q922_addr(const u_char *p, u_int *dlci, u_int *sdlcore, u_int *addr_len, u_int8_t *flags) { if ((p[0] & FR_EA_BIT)) return -1; *addr_len = 2; *dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4); flags[0] = p[0] & 0x02; /* populate the first flag fields */ flags[1] = p[1] & 0x0c; 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? */ flags[3] = p[0] & 0x02; if (p[0] & 0x02) *sdlcore = p[0] >> 2; else *dlci = (*dlci << 6) | (p[0] >> 2); return 0; } /* 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 void fr_hdr_print(int length, u_int addr_len, u_int dlci, u_int8_t *flags, u_int16_t nlpid) { if (qflag) { (void)printf("Q.922, DLCI %u, length %u: ", dlci, length); } else { if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */ (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ", addr_len, dlci, bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)), tok2str(nlpid_values,"unknown", nlpid), nlpid, length); else /* must be an ethertype */ (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ", addr_len, dlci, bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)), tok2str(ethertype_values, "unknown", nlpid), 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_int16_t extracted_ethertype; u_int dlci; u_int sdlcore; u_int addr_len; u_int16_t nlpid; u_int hdr_len; u_int8_t flags[4]; if (caplen < 4) { /* minimum frame header length */ printf("[|fr]"); return caplen; } if (parse_q922_addr(p, &dlci, &sdlcore, &addr_len, flags)) { printf("Q.922, invalid address"); return caplen; } hdr_len = fr_hdrlen(p, addr_len, caplen); if (caplen < hdr_len) { printf("[|fr]"); return caplen; } if (p[addr_len] != 0x03 && dlci != 0) { /* lets figure out if we have cisco style encapsulation: */ extracted_ethertype = EXTRACT_16BITS(p+addr_len); if (eflag) fr_hdr_print(length, addr_len, dlci, flags, extracted_ethertype); if (ether_encap_print(extracted_ethertype, p+addr_len+ETHERTYPE_LEN, length-addr_len-ETHERTYPE_LEN, caplen-addr_len-ETHERTYPE_LEN, &extracted_ethertype) == 0) /* ether_type not known, probably it wasn't one */ printf("UI %02x! ", p[addr_len]); else return hdr_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]; if (eflag) fr_hdr_print(length, addr_len, dlci, flags, nlpid); p += hdr_len; length -= hdr_len; caplen -= hdr_len; switch (nlpid) { case NLPID_IP: ip_print(gndo, p, length); break; #ifdef INET6 case NLPID_IP6: ip6_print(p, length); break; #endif case NLPID_CLNP: case NLPID_ESIS: case NLPID_ISIS: isoclns_print(p-1, length+1, caplen+1); /* OSI printers need the NLPID field */ break; case NLPID_SNAP: if (snap_print(p, length, caplen, &extracted_ethertype, 0) == 0) { /* ether_type not known, print raw packet */ if (!eflag) fr_hdr_print(length + hdr_len, hdr_len, dlci, flags, nlpid); if (!xflag && !qflag) default_print(p - hdr_len, caplen + hdr_len); } break; case NLPID_Q933: q933_print(p, length); break; case NLPID_MFR: frf15_print(p, length); break; default: if (!eflag) fr_hdr_print(length + hdr_len, addr_len, dlci, flags, nlpid); if (!xflag) default_print(p, caplen); } return hdr_len; } /* an NLPID of 0xb1 indicates a 2-byte * FRF.15 header * * 7 6 5 4 3 2 1 0 * +----+----+----+----+----+----+----+----+ * ~ Q.922 header ~ * +----+----+----+----+----+----+----+----+ * | NLPID (8 bits) | NLPID=0xb1 * +----+----+----+----+----+----+----+----+ * | B | E | C |seq. (high 4 bits) | R | * +----+----+----+----+----+----+----+----+ * | sequence (low 8 bits) | * +----+----+----+----+----+----+----+----+ */ struct tok frf15_flag_values[] = { { 0x80, "Begin" }, { 0x40, "End" }, { 0x20, "Control" }, { 0, NULL } }; #define FR_FRF15_FRAGTYPE 0x01 static void frf15_print (const u_char *p, u_int length) { u_int16_t sequence_num, flags; flags = p[0]&0xe0; sequence_num = (p[0]&0x1e)<<7 | p[1]; printf("FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u", sequence_num, bittok2str(frf15_flag_values,"none",flags), flags&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End", length); /* TODO: * depending on all permutations of the B, E and C bit * dig as deep as we can - e.g. on the first (B) fragment * there is enough payload to print the IP header * on non (B) fragments it depends if the fragmentation * model is end-to-end or interface based wether we want to print * another Q.922 header */ } /* * 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 struct tok fr_q933_msg_values[] = { { MSG_TYPE_ESC_TO_NATIONAL, "ESC to National" }, { MSG_TYPE_ALERT, "Alert" }, { MSG_TYPE_CALL_PROCEEDING, "Call proceeding" }, { MSG_TYPE_CONNECT, "Connect" }, { MSG_TYPE_CONNECT_ACK, "Connect ACK" }, { MSG_TYPE_PROGRESS, "Progress" }, { MSG_TYPE_SETUP, "Setup" }, { MSG_TYPE_DISCONNECT, "Disconnect" }, { MSG_TYPE_RELEASE, "Release" }, { MSG_TYPE_RELEASE_COMPLETE, "Release Complete" }, { MSG_TYPE_RESTART, "Restart" }, { MSG_TYPE_RESTART_ACK, "Restart ACK" }, { MSG_TYPE_STATUS, "Status Reply" }, { MSG_TYPE_STATUS_ENQ, "Status Enquiry" }, { 0, NULL } }; #define MSG_ANSI_LOCKING_SHIFT 0x95 #define FR_LMI_ANSI_REPORT_TYPE_IE 0x01 #define FR_LMI_ANSI_LINK_VERIFY_IE_91 0x19 /* details? */ #define FR_LMI_ANSI_LINK_VERIFY_IE 0x03 #define FR_LMI_ANSI_PVC_STATUS_IE 0x07 #define FR_LMI_CCITT_REPORT_TYPE_IE 0x51 #define FR_LMI_CCITT_LINK_VERIFY_IE 0x53 #define FR_LMI_CCITT_PVC_STATUS_IE 0x57 struct tok fr_q933_ie_values_codeset5[] = { { FR_LMI_ANSI_REPORT_TYPE_IE, "ANSI Report Type" }, { FR_LMI_ANSI_LINK_VERIFY_IE_91, "ANSI Link Verify" }, { FR_LMI_ANSI_LINK_VERIFY_IE, "ANSI Link Verify" }, { FR_LMI_ANSI_PVC_STATUS_IE, "ANSI PVC Status" }, { FR_LMI_CCITT_REPORT_TYPE_IE, "CCITT Report Type" }, { FR_LMI_CCITT_LINK_VERIFY_IE, "CCITT Link Verify" }, { FR_LMI_CCITT_PVC_STATUS_IE, "CCITT PVC Status" }, { 0, NULL } }; #define FR_LMI_REPORT_TYPE_IE_FULL_STATUS 0 #define FR_LMI_REPORT_TYPE_IE_LINK_VERIFY 1 #define FR_LMI_REPORT_TYPE_IE_ASYNC_PVC 2 struct tok fr_lmi_report_type_ie_values[] = { { FR_LMI_REPORT_TYPE_IE_FULL_STATUS, "Full Status" }, { FR_LMI_REPORT_TYPE_IE_LINK_VERIFY, "Link verify" }, { FR_LMI_REPORT_TYPE_IE_ASYNC_PVC, "Async PVC Status" }, { 0, NULL } }; /* array of 16 codepages - currently we only support codepage 5 */ static struct tok *fr_q933_ie_codesets[] = { NULL, NULL, NULL, NULL, NULL, fr_q933_ie_values_codeset5, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }; struct common_ie_header { u_int8_t ie_id; u_int8_t ie_len; }; static int fr_q933_print_ie_codeset5(const struct common_ie_header *ie_p, const u_char *p); typedef int (*codeset_pr_func_t)(const struct common_ie_header *ie_p, const u_char *p); /* array of 16 codepages - currently we only support codepage 5 */ static codeset_pr_func_t fr_q933_print_ie_codeset[] = { NULL, NULL, NULL, NULL, NULL, fr_q933_print_ie_codeset5, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }; void q933_print(const u_char *p, u_int length) { const u_char *ptemp = p; struct common_ie_header *ie_p; int olen; int is_ansi = 0; u_int codeset; if (length < 9) { /* shortest: Q.933a LINK VERIFY */ printf("[|q.933]"); return; } codeset = p[2]&0x0f; /* extract the codeset */ if (p[2] == MSG_ANSI_LOCKING_SHIFT) is_ansi = 1; printf("%s", eflag ? "" : "Q.933, "); /* printing out header part */ printf(is_ansi ? "ANSI" : "CCITT"); if (p[0]) printf(", Call Ref: 0x%02x", p[0]); if (vflag) printf(", %s (0x%02x), length %u", tok2str(fr_q933_msg_values,"unknown message",p[1]), p[1], length); else printf(", %s", tok2str(fr_q933_msg_values,"unknown message 0x%02x",p[1])); olen = length; /* preserve the original length for non verbose mode */ if (length < (u_int)(2 - is_ansi)) { printf("[|q.933]"); return; } length -= 2 - is_ansi; ptemp += 2 + is_ansi; /* Loop through the rest of IE */ while (length > sizeof(struct common_ie_header)) { ie_p = (struct common_ie_header *)ptemp; if (length < sizeof(struct common_ie_header) || length < sizeof(struct common_ie_header) + ie_p->ie_len) { if (vflag) /* not bark if there is just a trailer */ printf("\n[|q.933]"); else printf(", length %u",olen); return; } /* lets do the full IE parsing only in verbose mode * however some IEs (DLCI Status, Link Verify) * are also intereststing in non-verbose mode */ if (vflag) printf("\n\t%s IE (%u), length %u: ", tok2str(fr_q933_ie_codesets[codeset],"unknown",ie_p->ie_id), ie_p->ie_id, ie_p->ie_len); if (!fr_q933_print_ie_codeset[codeset] || (*fr_q933_print_ie_codeset[codeset])(ie_p, ptemp)) { if (vflag <= 1) print_unknown_data(ptemp+2,"\n\t",ie_p->ie_len); } /* do we want to see a hexdump of the IE ? */ if (vflag> 1) print_unknown_data(ptemp+2,"\n\t ",ie_p->ie_len); length = length - ie_p->ie_len - 2; ptemp = ptemp + ie_p->ie_len + 2; } if (!vflag) printf(", length %u",olen); } static int fr_q933_print_ie_codeset5(const struct common_ie_header *ie_p, const u_char *p) { u_int dlci; switch (ie_p->ie_id) { case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */ case FR_LMI_CCITT_REPORT_TYPE_IE: if (vflag) printf("%s (%u)", tok2str(fr_lmi_report_type_ie_values,"unknown",p[2]), p[2]); return 1; case FR_LMI_ANSI_LINK_VERIFY_IE: /* fall through */ case FR_LMI_CCITT_LINK_VERIFY_IE: case FR_LMI_ANSI_LINK_VERIFY_IE_91: if (!vflag) printf(", "); printf("TX Seq: %3d, RX Seq: %3d", p[2], p[3]); return 1; case FR_LMI_ANSI_PVC_STATUS_IE: /* fall through */ case FR_LMI_CCITT_PVC_STATUS_IE: if (!vflag) printf(", "); /* now parse the DLCI information element. */ if ((ie_p->ie_len < 3) || (p[2] & 0x80) || ((ie_p->ie_len == 3) && !(p[3] & 0x80)) || ((ie_p->ie_len == 4) && ((p[3] & 0x80) || !(p[4] & 0x80))) || ((ie_p->ie_len == 5) && ((p[3] & 0x80) || (p[4] & 0x80) || !(p[5] & 0x80))) || (ie_p->ie_len > 5) || !(p[ie_p->ie_len + 1] & 0x80)) printf("Invalid DLCI IE"); dlci = ((p[2] & 0x3F) << 4) | ((p[3] & 0x78) >> 3); if (ie_p->ie_len == 4) dlci = (dlci << 6) | ((p[4] & 0x7E) >> 1); else if (ie_p->ie_len == 5) dlci = (dlci << 13) | (p[4] & 0x7F) | ((p[5] & 0x7E) >> 1); printf("DLCI %u: status %s%s", dlci, p[ie_p->ie_len + 1] & 0x8 ? "New, " : "", p[ie_p->ie_len + 1] & 0x2 ? "Active" : "Inactive"); return 1; } return 0; }