/* * 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. */ #define NETDISSECT_REWORKED #ifdef HAVE_CONFIG_H #include "config.h" #endif #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(netdissect_options *ndo, 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 static const 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 } }; /* FRF.15 / FRF.16 */ #define MFR_B_BIT 0x80 #define MFR_E_BIT 0x40 #define MFR_C_BIT 0x20 #define MFR_BEC_MASK (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT) #define MFR_CTRL_FRAME (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT) #define MFR_FRAG_FRAME (MFR_B_BIT | MFR_E_BIT ) static const struct tok frf_flag_values[] = { { MFR_B_BIT, "Begin" }, { MFR_E_BIT, "End" }, { MFR_C_BIT, "Control" }, { 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 *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; flags[2] = 0; /* clear the rest of the flags */ flags[3] = 0; 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; *dlci = (*dlci << 6) | (p[0] >> 2); return 0; } char *q922_string(const u_char *p) { static u_int dlci, addr_len; static u_int8_t flags[4]; static char buffer[sizeof("DLCI xxxxxxxxxx")]; memset(buffer, 0, sizeof(buffer)); if (parse_q922_addr(p, &dlci, &addr_len, flags) == 0){ snprintf(buffer, sizeof(buffer), "DLCI %u", dlci); } return buffer; } /* 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) { if (!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(netdissect_options *ndo, int length, u_int addr_len, u_int dlci, u_int8_t *flags, u_int16_t nlpid) { if (ndo->ndo_qflag) { ND_PRINT((ndo, "Q.922, DLCI %u, length %u: ", dlci, length)); } else { if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */ ND_PRINT((ndo, "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 */ ND_PRINT((ndo, "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(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p) { register u_int length = h->len; register u_int caplen = h->caplen; ND_TCHECK2(*p, 4); /* minimum frame header length */ if ((length = fr_print(ndo, p, length)) == 0) return (0); else return length; trunc: ND_PRINT((ndo, "[|fr]")); return caplen; } u_int fr_print(netdissect_options *ndo, register const u_char *p, u_int length) { u_int16_t extracted_ethertype; u_int dlci; u_int addr_len; u_int16_t nlpid; u_int hdr_len; u_int8_t flags[4]; if (parse_q922_addr(p, &dlci, &addr_len, flags)) { ND_PRINT((ndo, "Q.922, invalid address")); return 0; } ND_TCHECK2(*p, addr_len+1+1); hdr_len = fr_hdrlen(p, addr_len); ND_TCHECK2(*p, hdr_len); if (p[addr_len] != 0x03 && dlci != 0) { /* lets figure out if we have cisco style encapsulation: */ extracted_ethertype = EXTRACT_16BITS(p+addr_len); if (ndo->ndo_eflag) fr_hdr_print(ndo, length, addr_len, dlci, flags, extracted_ethertype); if (ethertype_print(ndo, extracted_ethertype, p+addr_len+ETHERTYPE_LEN, length-addr_len-ETHERTYPE_LEN, length-addr_len-ETHERTYPE_LEN) == 0) /* ether_type not known, probably it wasn't one */ ND_PRINT((ndo, "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) ND_PRINT((ndo, "Pad! ")); } else if (addr_len == 3) ND_PRINT((ndo, "No pad! ")); nlpid = p[hdr_len - 1]; if (ndo->ndo_eflag) fr_hdr_print(ndo, length, addr_len, dlci, flags, nlpid); p += hdr_len; length -= hdr_len; switch (nlpid) { case NLPID_IP: ip_print(ndo, p, length); break; #ifdef INET6 case NLPID_IP6: ip6_print(ndo, p, length); break; #endif case NLPID_CLNP: case NLPID_ESIS: case NLPID_ISIS: isoclns_print(p-1, length+1, length+1); /* OSI printers need the NLPID field */ break; case NLPID_SNAP: if (snap_print(ndo, p, length, length, 0) == 0) { /* ether_type not known, print raw packet */ if (!ndo->ndo_eflag) fr_hdr_print(ndo, length + hdr_len, hdr_len, dlci, flags, nlpid); if (!ndo->ndo_suppress_default_print) ND_DEFAULTPRINT(p - hdr_len, length + hdr_len); } break; case NLPID_Q933: q933_print(ndo, p, length); break; case NLPID_MFR: frf15_print(ndo, p, length); break; case NLPID_PPP: ppp_print(p, length); break; default: if (!ndo->ndo_eflag) fr_hdr_print(ndo, length + hdr_len, addr_len, dlci, flags, nlpid); if (!ndo->ndo_xflag) ND_DEFAULTPRINT(p, length); } return hdr_len; trunc: ND_PRINT((ndo, "[|fr]")); return 0; } u_int mfr_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p) { register u_int length = h->len; register u_int caplen = h->caplen; ND_TCHECK2(*p, 2); /* minimum frame header length */ if ((length = mfr_print(ndo, p, length)) == 0) return (0); else return length; trunc: ND_PRINT((ndo, "[|mfr]")); return caplen; } #define MFR_CTRL_MSG_ADD_LINK 1 #define MFR_CTRL_MSG_ADD_LINK_ACK 2 #define MFR_CTRL_MSG_ADD_LINK_REJ 3 #define MFR_CTRL_MSG_HELLO 4 #define MFR_CTRL_MSG_HELLO_ACK 5 #define MFR_CTRL_MSG_REMOVE_LINK 6 #define MFR_CTRL_MSG_REMOVE_LINK_ACK 7 static const struct tok mfr_ctrl_msg_values[] = { { MFR_CTRL_MSG_ADD_LINK, "Add Link" }, { MFR_CTRL_MSG_ADD_LINK_ACK, "Add Link ACK" }, { MFR_CTRL_MSG_ADD_LINK_REJ, "Add Link Reject" }, { MFR_CTRL_MSG_HELLO, "Hello" }, { MFR_CTRL_MSG_HELLO_ACK, "Hello ACK" }, { MFR_CTRL_MSG_REMOVE_LINK, "Remove Link" }, { MFR_CTRL_MSG_REMOVE_LINK_ACK, "Remove Link ACK" }, { 0, NULL } }; #define MFR_CTRL_IE_BUNDLE_ID 1 #define MFR_CTRL_IE_LINK_ID 2 #define MFR_CTRL_IE_MAGIC_NUM 3 #define MFR_CTRL_IE_TIMESTAMP 5 #define MFR_CTRL_IE_VENDOR_EXT 6 #define MFR_CTRL_IE_CAUSE 7 static const struct tok mfr_ctrl_ie_values[] = { { MFR_CTRL_IE_BUNDLE_ID, "Bundle ID"}, { MFR_CTRL_IE_LINK_ID, "Link ID"}, { MFR_CTRL_IE_MAGIC_NUM, "Magic Number"}, { MFR_CTRL_IE_TIMESTAMP, "Timestamp"}, { MFR_CTRL_IE_VENDOR_EXT, "Vendor Extension"}, { MFR_CTRL_IE_CAUSE, "Cause"}, { 0, NULL } }; #define MFR_ID_STRING_MAXLEN 50 struct ie_tlv_header_t { u_int8_t ie_type; u_int8_t ie_len; }; u_int mfr_print(netdissect_options *ndo, register const u_char *p, u_int length) { u_int tlen,idx,hdr_len = 0; u_int16_t sequence_num; u_int8_t ie_type,ie_len; const u_int8_t *tptr; /* * FRF.16 Link Integrity Control Frame * * 7 6 5 4 3 2 1 0 * +----+----+----+----+----+----+----+----+ * | B | E | C=1| 0 0 0 0 | EA | * +----+----+----+----+----+----+----+----+ * | 0 0 0 0 0 0 0 0 | * +----+----+----+----+----+----+----+----+ * | message type | * +----+----+----+----+----+----+----+----+ */ ND_TCHECK2(*p, 4); /* minimum frame header length */ if ((p[0] & MFR_BEC_MASK) == MFR_CTRL_FRAME && p[1] == 0) { ND_PRINT((ndo, "FRF.16 Control, Flags [%s], %s, length %u", bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)), tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",p[2]), length)); tptr = p + 3; tlen = length -3; hdr_len = 3; if (!ndo->ndo_vflag) return hdr_len; while (tlen>sizeof(struct ie_tlv_header_t)) { ND_TCHECK2(*tptr, sizeof(struct ie_tlv_header_t)); ie_type=tptr[0]; ie_len=tptr[1]; ND_PRINT((ndo, "\n\tIE %s (%u), length %u: ", tok2str(mfr_ctrl_ie_values,"Unknown",ie_type), ie_type, ie_len)); /* infinite loop check */ if (ie_type == 0 || ie_len <= sizeof(struct ie_tlv_header_t)) return hdr_len; ND_TCHECK2(*tptr, ie_len); tptr+=sizeof(struct ie_tlv_header_t); /* tlv len includes header */ ie_len-=sizeof(struct ie_tlv_header_t); tlen-=sizeof(struct ie_tlv_header_t); switch (ie_type) { case MFR_CTRL_IE_MAGIC_NUM: ND_PRINT((ndo, "0x%08x", EXTRACT_32BITS(tptr))); break; case MFR_CTRL_IE_BUNDLE_ID: /* same message format */ case MFR_CTRL_IE_LINK_ID: for (idx = 0; idx < ie_len && idx < MFR_ID_STRING_MAXLEN; idx++) { if (*(tptr+idx) != 0) /* don't print null termination */ safeputchar(*(tptr+idx)); else break; } break; case MFR_CTRL_IE_TIMESTAMP: if (ie_len == sizeof(struct timeval)) { ts_print((const struct timeval *)tptr); break; } /* fall through and hexdump if no unix timestamp */ /* * FIXME those are the defined IEs that lack a decoder * you are welcome to contribute code ;-) */ case MFR_CTRL_IE_VENDOR_EXT: case MFR_CTRL_IE_CAUSE: default: if (ndo->ndo_vflag <= 1) print_unknown_data(ndo, tptr, "\n\t ", ie_len); break; } /* do we want to see a hexdump of the IE ? */ if (ndo->ndo_vflag > 1 ) print_unknown_data(ndo, tptr, "\n\t ", ie_len); tlen-=ie_len; tptr+=ie_len; } return hdr_len; } /* * FRF.16 Fragmentation Frame * * 7 6 5 4 3 2 1 0 * +----+----+----+----+----+----+----+----+ * | B | E | C=0|seq. (high 4 bits) | EA | * +----+----+----+----+----+----+----+----+ * | sequence (low 8 bits) | * +----+----+----+----+----+----+----+----+ * | DLCI (6 bits) | CR | EA | * +----+----+----+----+----+----+----+----+ * | DLCI (4 bits) |FECN|BECN| DE | EA | * +----+----+----+----+----+----+----+----+ */ sequence_num = (p[0]&0x1e)<<7 | p[1]; /* whole packet or first fragment ? */ if ((p[0] & MFR_BEC_MASK) == MFR_FRAG_FRAME || (p[0] & MFR_BEC_MASK) == MFR_B_BIT) { ND_PRINT((ndo, "FRF.16 Frag, seq %u, Flags [%s], ", sequence_num, bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)))); hdr_len = 2; fr_print(ndo, p+hdr_len,length-hdr_len); return hdr_len; } /* must be a middle or the last fragment */ ND_PRINT((ndo, "FRF.16 Frag, seq %u, Flags [%s]", sequence_num, bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)))); print_unknown_data(ndo, p, "\n\t", length); return hdr_len; trunc: ND_PRINT((ndo, "[|mfr]")); return length; } /* 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) | * +----+----+----+----+----+----+----+----+ */ #define FR_FRF15_FRAGTYPE 0x01 static void frf15_print(netdissect_options *ndo, const u_char *p, u_int length) { u_int16_t sequence_num, flags; flags = p[0]&MFR_BEC_MASK; sequence_num = (p[0]&0x1e)<<7 | p[1]; ND_PRINT((ndo, "FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u", sequence_num, bittok2str(frf_flag_values,"none",flags), p[0]&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 static const 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 static const 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 static const 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 1,5 */ static const struct tok *fr_q933_ie_codesets[] = { NULL, fr_q933_ie_values_codeset5, NULL, NULL, NULL, fr_q933_ie_values_codeset5, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }; static int fr_q933_print_ie_codeset5(netdissect_options *ndo, const struct ie_tlv_header_t *ie_p, const u_char *p); typedef int (*codeset_pr_func_t)(netdissect_options *, const struct ie_tlv_header_t *ie_p, const u_char *p); /* array of 16 codepages - currently we only support codepage 1,5 */ static const codeset_pr_func_t fr_q933_print_ie_codeset[] = { NULL, fr_q933_print_ie_codeset5, NULL, NULL, NULL, fr_q933_print_ie_codeset5, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }; void q933_print(netdissect_options *ndo, const u_char *p, u_int length) { const u_char *ptemp = p; struct ie_tlv_header_t *ie_p; int olen; int is_ansi = 0; u_int codeset; u_int ie_is_known = 0; if (length < 9) { /* shortest: Q.933a LINK VERIFY */ ND_PRINT((ndo, "[|q.933]")); return; } codeset = p[2]&0x0f; /* extract the codeset */ if (p[2] == MSG_ANSI_LOCKING_SHIFT) { is_ansi = 1; } ND_PRINT((ndo, "%s", ndo->ndo_eflag ? "" : "Q.933, ")); /* printing out header part */ ND_PRINT((ndo, "%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset)); if (p[0]) { ND_PRINT((ndo, ", Call Ref: 0x%02x", p[0])); } if (ndo->ndo_vflag) { ND_PRINT((ndo, ", %s (0x%02x), length %u", tok2str(fr_q933_msg_values, "unknown message", p[1]), p[1], length)); } else { ND_PRINT((ndo, ", %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)) { ND_PRINT((ndo, "[|q.933]")); return; } length -= 2 + is_ansi; ptemp += 2 + is_ansi; /* Loop through the rest of IE */ while (length > sizeof(struct ie_tlv_header_t)) { ie_p = (struct ie_tlv_header_t *)ptemp; if (length < sizeof(struct ie_tlv_header_t) || length < sizeof(struct ie_tlv_header_t) + ie_p->ie_len) { if (ndo->ndo_vflag) { /* not bark if there is just a trailer */ ND_PRINT((ndo, "\n[|q.933]")); } else { ND_PRINT((ndo, ", length %u", olen)); } return; } /* lets do the full IE parsing only in verbose mode * however some IEs (DLCI Status, Link Verify) * are also interestting in non-verbose mode */ if (ndo->ndo_vflag) { ND_PRINT((ndo, "\n\t%s IE (0x%02x), length %u: ", tok2str(fr_q933_ie_codesets[codeset], "unknown", ie_p->ie_type), ie_p->ie_type, ie_p->ie_len)); } /* sanity check */ if (ie_p->ie_type == 0 || ie_p->ie_len == 0) { return; } if (fr_q933_print_ie_codeset[codeset] != NULL) { ie_is_known = fr_q933_print_ie_codeset[codeset](ndo, ie_p, ptemp); } if (ndo->ndo_vflag >= 1 && !ie_is_known) { print_unknown_data(ndo, ptemp+2, "\n\t", ie_p->ie_len); } /* do we want to see a hexdump of the IE ? */ if (ndo->ndo_vflag> 1 && ie_is_known) { print_unknown_data(ndo, ptemp+2, "\n\t ", ie_p->ie_len); } length = length - ie_p->ie_len - 2; ptemp = ptemp + ie_p->ie_len + 2; } if (!ndo->ndo_vflag) { ND_PRINT((ndo, ", length %u", olen)); } } static int fr_q933_print_ie_codeset5(netdissect_options *ndo, const struct ie_tlv_header_t *ie_p, const u_char *p) { u_int dlci; switch (ie_p->ie_type) { case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */ case FR_LMI_CCITT_REPORT_TYPE_IE: if (ndo->ndo_vflag) { ND_PRINT((ndo, "%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 (!ndo->ndo_vflag) { ND_PRINT((ndo, ", ")); } ND_PRINT((ndo, "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 (!ndo->ndo_vflag) { ND_PRINT((ndo, ", ")); } /* 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)) { ND_PRINT((ndo, "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); } ND_PRINT((ndo, "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; } /* * Local Variables: * c-style: whitesmith * c-basic-offset: 8 * End: */