X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/dc3034d63de71a109f5c37ee3210ce199d4399ca..refs/heads/tcpdump-4.0:/print-fr.c diff --git a/print-fr.c b/print-fr.c index f6ff9329..f71aee66 100644 --- a/print-fr.c +++ b/print-fr.c @@ -20,8 +20,8 @@ */ #ifndef lint -static const char rcsid[] = - "@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.15 2003-10-16 09:50:37 guy Exp $ (LBL)"; +static const char rcsid[] _U_ = + "@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.51 2006-06-23 22:20:32 hannes Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H @@ -37,50 +37,82 @@ static const char rcsid[] = #include "addrtoname.h" #include "interface.h" #include "ethertype.h" +#include "nlpid.h" #include "extract.h" +#include "oui.h" -static void lmi_print(const u_char *, u_int); +static void frf15_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 +/* + * 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 -/* 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; +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 ) + +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; - *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 */ + 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 */ @@ -96,42 +128,28 @@ static int parse_q922_addr(const u_char *p, u_int *dlci, u_int *addr_len, 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); + flags[3] = p[0] & 0x02; + + *dlci = (*dlci << 6) | (p[0] >> 2); return 0; } +char *q922_string(const u_char *p) { -static const char *fr_nlpids[256]; + static u_int dlci, addr_len; + static u_int8_t flags[4]; + static char buffer[sizeof("DLCI xxxxxxxxxx")]; + memset(buffer, 0, sizeof(buffer)); -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; + 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 +---------------------------+ @@ -159,39 +177,39 @@ init_fr_nlpids(void) */ static u_int -fr_hdrlen(const u_char *p, u_int addr_len, u_int caplen) +fr_hdrlen(const u_char *p, u_int addr_len) { - if ((caplen > addr_len + 1 /* UI */ + 1 /* pad */) && - !p[addr_len + 1] /* pad exist */) + 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 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) +fr_hdr_print(int length, u_int addr_len, u_int dlci, u_int8_t *flags, u_int16_t 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); + 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 @@ -199,33 +217,55 @@ 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; - int dlci, addr_len; - u_char nlpid; + + TCHECK2(*p, 4); /* minimum frame header length */ + + if ((length = fr_print(p, length)) == 0) + return (0); + else + return length; + trunc: + printf("[|fr]"); + return caplen; +} + +u_int +fr_print(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; - char *flags; + u_int8_t flags[4]; - if (caplen < 4) { /* minimum frame header length */ - printf("[|fr]"); - return caplen; + if (parse_q922_addr(p, &dlci, &addr_len, flags)) { + printf("Q.922, invalid address"); + return 0; } - if (parse_q922_addr(p, &dlci, &addr_len, &flags)) { - printf("Invalid Q.922 address"); - return caplen; - } + TCHECK2(*p,addr_len+1+1); + hdr_len = fr_hdrlen(p, addr_len); + TCHECK2(*p,hdr_len); - hdr_len = fr_hdrlen(p, addr_len, caplen); + if (p[addr_len] != 0x03 && dlci != 0) { - if (caplen < hdr_len) { - printf("[|fr]"); - return caplen; - } + /* lets figure out if we have cisco style encapsulation: */ + extracted_ethertype = EXTRACT_16BITS(p+addr_len); - if (p[addr_len] != 0x03) - printf("UI %02x! ", 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, + length-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) @@ -235,61 +275,309 @@ fr_if_print(const struct pcap_pkthdr *h, register const u_char *p) 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; - - if (eflag) - fr_hdr_print(length, dlci, flags, nlpid); switch (nlpid) { case NLPID_IP: - ip_print(p, length); + ip_print(gndo, p, length); break; #ifdef INET6 - case NLPID_IPV6: + case NLPID_IP6: ip6_print(p, length); break; #endif case NLPID_CLNP: case NLPID_ESIS: case NLPID_ISIS: - isoclns_print(p, length, caplen); + isoclns_print(p-1, length+1, length+1); /* OSI printers need the NLPID field */ 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) { + if (snap_print(p, length, length, &extracted_ethertype, 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); + if (!eflag) + fr_hdr_print(length + hdr_len, hdr_len, + dlci, flags, nlpid); + if (!suppress_default_print) + default_print(p - hdr_len, length + hdr_len); } break; - case NLPID_LMI: - lmi_print(p, length); + case NLPID_Q933: + q933_print(p, length); break; + case NLPID_MFR: + frf15_print(p, length); + break; + + case NLPID_PPP: + ppp_print(p, length); + break; + default: if (!eflag) - fr_hdr_print(length + hdr_len, + fr_hdr_print(length + hdr_len, addr_len, dlci, flags, nlpid); if (!xflag) - default_print(p, caplen); + default_print(p, length); } return hdr_len; + + trunc: + printf("[|fr]"); + return 0; + +} + +u_int +mfr_if_print(const struct pcap_pkthdr *h, register const u_char *p) +{ + register u_int length = h->len; + register u_int caplen = h->caplen; + + TCHECK2(*p, 2); /* minimum frame header length */ + + if ((length = mfr_print(p, length)) == 0) + return (0); + else + return length; + trunc: + printf("[|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 + +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 + +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(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 | + * +----+----+----+----+----+----+----+----+ + */ + + TCHECK2(*p, 4); /* minimum frame header length */ + + if ((p[0] & MFR_BEC_MASK) == MFR_CTRL_FRAME && p[1] == 0) { + printf("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 (!vflag) + return hdr_len; + + while (tlen>sizeof(struct ie_tlv_header_t)) { + TCHECK2(*tptr, sizeof(struct ie_tlv_header_t)); + ie_type=tptr[0]; + ie_len=tptr[1]; + + printf("\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; + + 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: + printf("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 (vflag <= 1) + print_unknown_data(tptr,"\n\t ",ie_len); + break; + } + + /* do we want to see a hexdump of the IE ? */ + if (vflag > 1 ) + print_unknown_data(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) { + printf("FRF.16 Frag, seq %u, Flags [%s], ", + sequence_num, + bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))); + hdr_len = 2; + fr_print(p+hdr_len,length-hdr_len); + return hdr_len; + } + + /* must be a middle or the last fragment */ + printf("FRF.16 Frag, seq %u, Flags [%s]", + sequence_num, + bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))); + print_unknown_data(p,"\n\t",length); + + return hdr_len; + + trunc: + printf("[|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 (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]; + + printf("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 + */ + } /* @@ -339,160 +627,258 @@ fr_if_print(const struct pcap_pkthdr *h, register const u_char *p) #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 +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 CCITT_REPORT_TYPE_IE 0x51 -#define CCITT_LINK_VERIFY_IE 0x53 -#define CCITT_PVC_STATUS_IE 0x57 +#define MSG_ANSI_LOCKING_SHIFT 0x95 -struct common_ie_header { - u_int8_t ie_id; - u_int8_t ie_len; +#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 FULL_STATUS 0 -#define LINK_VERIFY 1 -#define ASYNC_PVC 2 - +#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 -/* 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; +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 } +}; - 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[2] & 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; -} +/* array of 16 codepages - currently we only support codepage 1,5 */ +static 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(const struct ie_tlv_header_t *ie_p, + const u_char *p); + +typedef int (*codeset_pr_func_t)(const struct ie_tlv_header_t *ie_p, + const u_char *p); + +/* array of 16 codepages - currently we only support codepage 1,5 */ +static 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 +}; -static void -lmi_print(const u_char *p, u_int length) +void +q933_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; + 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 */ - printf("[|lmi]"); + printf("[|q.933]"); 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]); + codeset = p[2]&0x0f; /* extract the codeset */ - switch(p[1]) { - - case MSG_TYPE_STATUS: - printf(" STATUS REPLY\n"); - break; + if (p[2] == MSG_ANSI_LOCKING_SHIFT) { + is_ansi = 1; + } + + printf("%s", eflag ? "" : "Q.933, "); - case MSG_TYPE_STATUS_ENQ: - printf(" STATUS ENQUIRY\n"); - break; + /* printing out header part */ + printf("%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset); - default: - printf(" UNKNOWN MSG Type %02x\n", p[1]); - break; + 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("[|lmi]"); + printf("[|q.933]"); return; } - length -= 2 - is_ansi; + length -= 2 + is_ansi; ptemp += 2 + is_ansi; /* Loop through the rest of IE */ - while (length > 0) { - if (is_ansi && (ptemp[0] & ONE_BYTE_IE_MASK)) { - /* not sure what's that - any pointers to - documentation? Is it for ANSI T1.617 annex D only, - isn't it? */ - printf("\t\tOne byte IE: %02x, Content %02x\n", - (*ptemp & 0x70) >> 4, (*ptemp & 0x0F)); - length--; - ptemp++; - continue; + 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 (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 interestting in non-verbose mode */ + if (vflag) { + printf("\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](ie_p, ptemp); + } + + if (vflag >= 1 && !ie_is_known) { + print_unknown_data(ptemp+2,"\n\t",ie_p->ie_len); } - /* Multi-byte IE */ - 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; + /* do we want to see a hexdump of the IE ? */ + if (vflag> 1 && ie_is_known) { + print_unknown_data(ptemp+2,"\n\t ",ie_p->ie_len); } - 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; } + if (!vflag) { + printf(", length %u",olen); + } +} + +static int +fr_q933_print_ie_codeset5(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 (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; }