* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#ifndef lint
-static const char rcsid[] _U_ =
- "@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.19 2003-11-16 09:36:21 guy Exp $ (LBL)";
-#endif
-
+#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <string.h>
-#include <pcap.h>
-#include "addrtoname.h"
#include "interface.h"
+#include "addrtoname.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(netdissect_options *ndo, 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;
+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, uint8_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 */
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 uint8_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
+---------------------------+
*/
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
+ 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(netdissect_options *ndo,
+ int length, u_int addr_len, u_int dlci, uint8_t *flags, uint16_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 (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(const struct pcap_pkthdr *h, register const u_char *p)
+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;
- u_short extracted_ethertype;
- u_int32_t orgcode;
- register u_short et;
- int dlci, addr_len;
- u_char nlpid;
+
+ 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)
+{
+ uint16_t extracted_ethertype;
+ u_int dlci;
+ u_int addr_len;
+ uint16_t nlpid;
u_int hdr_len;
- char *flags;
+ uint8_t flags[4];
- if (caplen < 4) { /* minimum frame header length */
- printf("[|fr]");
- return caplen;
+ if (parse_q922_addr(p, &dlci, &addr_len, flags)) {
+ ND_PRINT((ndo, "Q.922, invalid address"));
+ return 0;
}
- if (parse_q922_addr(p, &dlci, &addr_len, &flags)) {
- printf("Invalid Q.922 address");
- return caplen;
- }
+ ND_TCHECK2(*p, addr_len+1+1);
+ hdr_len = fr_hdrlen(p, addr_len);
+ ND_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 (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)
- printf("Pad! ");
+ ND_PRINT((ndo, "Pad! "));
} else if (addr_len == 3)
- printf("No pad! ");
+ 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;
- caplen -= hdr_len;
-
- if (eflag)
- fr_hdr_print(length, dlci, flags, nlpid);
switch (nlpid) {
case NLPID_IP:
- ip_print(p, length);
+ ip_print(ndo, p, length);
break;
#ifdef INET6
- case NLPID_IPV6:
- ip6_print(p, length);
+ case NLPID_IP6:
+ ip6_print(ndo, p, length);
break;
#endif
case NLPID_CLNP:
case NLPID_ESIS:
case NLPID_ISIS:
- isoclns_print(p, length, caplen);
+ isoclns_print(ndo, 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(ndo, p, length, length, 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 (!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_LMI:
- lmi_print(p, length);
+ case NLPID_Q933:
+ q933_print(ndo, p, length);
break;
+ case NLPID_MFR:
+ frf15_print(ndo, p, length);
+ break;
+
+ case NLPID_PPP:
+ ppp_print(ndo, p, length);
+ break;
+
default:
- if (!eflag)
- fr_hdr_print(length + hdr_len,
+ if (!ndo->ndo_eflag)
+ fr_hdr_print(ndo, length + hdr_len, addr_len,
dlci, flags, nlpid);
- if (!xflag)
- default_print(p, caplen);
+ 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 {
+ uint8_t ie_type;
+ uint8_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;
+ uint16_t sequence_num;
+ uint8_t ie_type,ie_len;
+ const uint8_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(ndo, *(tptr + idx));
+ else
+ break;
+ }
+ break;
+
+ case MFR_CTRL_IE_TIMESTAMP:
+ if (ie_len == sizeof(struct timeval)) {
+ ts_print(ndo, (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) {
+
+ uint16_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 packet format
- Format of Other Protocols
+ Format of Other Protocols
using Q.933 NLPID
- +-------------------------------+
- | Q.922 Address |
+ +-------------------------------+
+ | Q.922 Address |
+ +---------------+---------------+
+ |Control 0x03 | NLPID 0x08 |
+---------------+---------------+
- |Control 0x03 | NLPID 0x08 |
- +---------------+---------------+
| L2 Protocol ID |
| octet 1 | octet 2 |
+-------------------------------+
#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
+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 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
+
+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 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;
+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 }
+};
- 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;
-}
+/* 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
+};
-static void
-lmi_print(const u_char *p, u_int length)
+void
+q933_print(netdissect_options *ndo,
+ 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]");
+ ND_PRINT((ndo, "[|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]) {
+ if (p[2] == MSG_ANSI_LOCKING_SHIFT) {
+ is_ansi = 1;
+ }
- case MSG_TYPE_STATUS:
- printf(" STATUS REPLY\n");
- break;
+ ND_PRINT((ndo, "%s", ndo->ndo_eflag ? "" : "Q.933, "));
- case MSG_TYPE_STATUS_ENQ:
- printf(" STATUS ENQUIRY\n");
- break;
+ /* printing out header part */
+ ND_PRINT((ndo, "%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset));
- default:
- printf(" UNKNOWN MSG Type %02x\n", p[1]);
- break;
+ 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)) {
- printf("[|lmi]");
+ ND_PRINT((ndo, "[|q.933]"));
return;
}
- length -= 2 - is_ansi;
+ 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;
+ 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);
}
- 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 (!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:
+ */
projects / tcpdump / blobdiff