* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#ifndef lint
-static const char rcsid[] _U_ =
- "@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.43 2005-07-27 00:25:58 guy Exp $ (LBL)";
-#endif
+/* \summary: Frame Relay printer */
#ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
#endif
-#include <tcpdump-stdinc.h>
+#include "netdissect-stdinc.h"
#include <stdio.h>
#include <string.h>
-#include <pcap.h>
+#include "netdissect.h"
#include "addrtoname.h"
-#include "interface.h"
#include "ethertype.h"
+#include "llc.h"
#include "nlpid.h"
#include "extract.h"
#include "oui.h"
-static void frf15_print(const u_char *, u_int);
+static void frf15_print(netdissect_options *ndo, const u_char *, u_int);
/*
* the frame relay header has a variable length
#define FR_SDLC_BIT 0x00000002
-struct tok fr_header_flag_values[] = {
+static const struct tok fr_header_flag_values[] = {
{ FR_CR_BIT, "C!" },
{ FR_DE_BIT, "DE" },
{ FR_BECN_BIT, "BECN" },
{ 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 )
-/* Finds out Q.922 address length, DLCI and flags. Returns 0 on success
+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 1 on success,
+ * 0 on invalid address, -1 on truncated packet
* 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)
+static int parse_q922_header(netdissect_options *ndo,
+ const u_char *p, u_int *dlci,
+ u_int *addr_len, uint32_t *flags, u_int length)
{
- if ((p[0] & FR_EA_BIT))
+ if (!ND_TTEST_1(p) || length < 1)
return -1;
+ if ((GET_U_1(p) & FR_EA_BIT))
+ return 0;
+ if (!ND_TTEST_1(p + 1) || length < 2)
+ return -1;
*addr_len = 2;
- *dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4);
+ *dlci = ((GET_U_1(p) & 0xFC) << 2) | ((GET_U_1(p + 1) & 0xF0) >> 4);
- flags[0] = p[0] & 0x02; /* populate the first flag fields */
- flags[1] = p[1] & 0x0c;
+ *flags = ((GET_U_1(p) & 0x02) << 24) | /* CR flag */
+ ((GET_U_1(p + 1) & 0x0e) << 16); /* FECN,BECN,DE flags */
- if (p[1] & FR_EA_BIT)
- return 0; /* 2-byte Q.922 address */
+ if (GET_U_1(p + 1) & FR_EA_BIT)
+ return 1; /* 2-byte Q.922 address */
p += 2;
+ length -= 2;
+ if (!ND_TTEST_1(p) || length < 1)
+ return -1;
(*addr_len)++; /* 3- or 4-byte Q.922 address */
- if ((p[0] & FR_EA_BIT) == 0) {
- *dlci = (*dlci << 7) | (p[0] >> 1);
+ if ((GET_U_1(p) & FR_EA_BIT) == 0) {
+ *dlci = (*dlci << 7) | (GET_U_1(p) >> 1);
(*addr_len)++; /* 4-byte Q.922 address */
p++;
+ length--;
}
- if ((p[0] & FR_EA_BIT) == 0)
- return -1; /* more than 4 bytes of Q.922 address? */
+ if (!ND_TTEST_1(p) || length < 1)
+ return -1;
+ if ((GET_U_1(p) & FR_EA_BIT) == 0)
+ return 0; /* more than 4 bytes of Q.922 address? */
- flags[3] = p[0] & 0x02;
+ *flags = *flags | (GET_U_1(p) & 0x02); /* SDLC flag */
- if (p[0] & 0x02)
- *sdlcore = p[0] >> 2;
- else
- *dlci = (*dlci << 6) | (p[0] >> 2);
+ *dlci = (*dlci << 6) | (GET_U_1(p) >> 2);
- return 0;
+ return 1;
}
+const char *
+q922_string(netdissect_options *ndo, const u_char *p, u_int length)
+{
+
+ static u_int dlci, addr_len;
+ static uint32_t flags;
+ static char buffer[sizeof("DLCI xxxxxxxxxx")];
+ memset(buffer, 0, sizeof(buffer));
+
+ if (parse_q922_header(ndo, p, &dlci, &addr_len, &flags, length) == 1){
+ snprintf(buffer, sizeof(buffer), "DLCI %u", dlci);
+ }
+
+ return buffer;
+}
+
+
/* Frame Relay packet structure, with flags and CRC removed
+---------------------------+
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(int length, u_int addr_len, u_int dlci, u_int8_t *flags, u_int16_t nlpid)
+fr_hdr_print(netdissect_options *ndo, int length, u_int addr_len,
+ u_int dlci, uint32_t flags, uint16_t nlpid)
{
- if (qflag) {
- (void)printf("Q.922, DLCI %u, length %u: ",
+ if (ndo->ndo_qflag) {
+ ND_PRINT("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: ",
+ ND_PRINT("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)),
+ bittok2str(fr_header_flag_values, "none", 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: ",
+ ND_PRINT("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)),
+ bittok2str(fr_header_flag_values, "none", flags),
tok2str(ethertype_values, "unknown", nlpid),
nlpid,
- length);
+ 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, const u_char *p)
{
- register u_int length = h->len;
- register u_int caplen = h->caplen;
+ u_int length = h->len;
+ u_int caplen = h->caplen;
- TCHECK2(*p, 4); /* minimum frame header length */
+ ndo->ndo_protocol = "fr_if";
+ ND_TCHECK_4(p); /* minimum frame header length */
- if ((length = fr_print(p, length)) == 0)
+ if ((length = fr_print(ndo, p, length)) == 0)
return (0);
else
return length;
- trunc:
- printf("[|fr]");
+trunc:
+ nd_print_trunc(ndo);
return caplen;
}
u_int
-fr_print(register const u_char *p, u_int length)
+fr_print(netdissect_options *ndo,
+ const u_char *p, u_int length)
{
- u_int16_t extracted_ethertype;
+ int ret;
+ uint16_t extracted_ethertype;
u_int dlci;
- u_int sdlcore;
u_int addr_len;
- u_int16_t nlpid;
+ uint16_t nlpid;
u_int hdr_len;
- u_int8_t flags[4];
-
- if (parse_q922_addr(p, &dlci, &sdlcore, &addr_len, flags)) {
- printf("Q.922, invalid address");
+ uint32_t flags;
+
+ ndo->ndo_protocol = "fr";
+ ret = parse_q922_header(ndo, p, &dlci, &addr_len, &flags, length);
+ if (ret == -1)
+ goto trunc;
+ if (ret == 0) {
+ ND_PRINT("Q.922, invalid address");
return 0;
}
- TCHECK2(*p,addr_len+1+1);
- hdr_len = fr_hdrlen(p, addr_len);
- 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 (eflag)
- fr_hdr_print(length, addr_len, dlci, flags, extracted_ethertype);
+ ND_TCHECK_1(p + addr_len);
+ if (length < addr_len + 1)
+ goto trunc;
- 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 (GET_U_1(p + addr_len) != LLC_UI && dlci != 0) {
+ /*
+ * Let's figure out if we have Cisco-style encapsulation,
+ * with an Ethernet type (Cisco HDLC type?) following the
+ * address.
+ */
+ if (!ND_TTEST_2(p + addr_len) || length < addr_len + 2) {
+ /* no Ethertype */
+ ND_PRINT("UI %02x! ", GET_U_1(p + addr_len));
+ } else {
+ extracted_ethertype = GET_BE_U_2(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,
+ ND_BYTES_AVAILABLE_AFTER(p)-addr_len-ETHERTYPE_LEN,
+ NULL, NULL) == 0)
+ /* ether_type not known, probably it wasn't one */
+ ND_PRINT("UI %02x! ", GET_U_1(p + addr_len));
+ else
+ return addr_len + 2;
+ }
}
- if (!p[addr_len + 1]) { /* pad byte should be used with 3-byte Q.922 */
+ ND_TCHECK_1(p + addr_len + 1);
+ if (length < addr_len + 2)
+ goto trunc;
+
+ if (GET_U_1(p + addr_len + 1) == 0) {
+ /*
+ * Assume a pad byte after the control (UI) byte.
+ * A pad byte should only be used with 3-byte Q.922.
+ */
if (addr_len != 3)
- printf("Pad! ");
- } else if (addr_len == 3)
- printf("No pad! ");
+ ND_PRINT("Pad! ");
+ hdr_len = addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */;
+ } else {
+ /*
+ * Not a pad byte.
+ * A pad byte should be used with 3-byte Q.922.
+ */
+ if (addr_len == 3)
+ ND_PRINT("No pad! ");
+ hdr_len = addr_len + 1 /* UI */ + 1 /* NLPID */;
+ }
- nlpid = p[hdr_len - 1];
+ ND_TCHECK_1(p + hdr_len - 1);
+ if (length < hdr_len)
+ goto trunc;
+ nlpid = GET_U_1(p + hdr_len - 1);
- if (eflag)
- fr_hdr_print(length, addr_len, dlci, flags, nlpid);
+ 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(gndo, p, length);
+ ip_print(ndo, p, length);
break;
-#ifdef INET6
case NLPID_IP6:
- ip6_print(p, length);
+ 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 */
+ isoclns_print(ndo, p - 1, length + 1); /* OSI printers need the NLPID field */
break;
case NLPID_SNAP:
- if (snap_print(p, length, length, &extracted_ethertype, 0) == 0) {
+ if (snap_print(ndo, p, length, ND_BYTES_AVAILABLE_AFTER(p), NULL, NULL, 0) == 0) {
/* ether_type not known, print raw packet */
- if (!eflag)
- fr_hdr_print(length + hdr_len, hdr_len,
+ if (!ndo->ndo_eflag)
+ fr_hdr_print(ndo, length + hdr_len, hdr_len,
dlci, flags, nlpid);
- if (!suppress_default_print)
- default_print(p - hdr_len, length + hdr_len);
+ if (!ndo->ndo_suppress_default_print)
+ ND_DEFAULTPRINT(p - hdr_len, length + hdr_len);
}
break;
case NLPID_Q933:
- q933_print(p, length);
+ q933_print(ndo, p, length);
break;
case NLPID_MFR:
- frf15_print(p, length);
+ frf15_print(ndo, p, length);
+ break;
+
+ case NLPID_PPP:
+ ppp_print(ndo, p, length);
break;
default:
- if (!eflag)
- fr_hdr_print(length + hdr_len, addr_len,
+ if (!ndo->ndo_eflag)
+ fr_hdr_print(ndo, length + hdr_len, addr_len,
dlci, flags, nlpid);
- if (!xflag)
- default_print(p, length);
+ if (!ndo->ndo_xflag)
+ ND_DEFAULTPRINT(p, length);
}
return hdr_len;
- trunc:
- printf("[|fr]");
+trunc:
+ nd_print_trunc(ndo);
return 0;
}
-#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 )
+u_int
+mfr_if_print(netdissect_options *ndo,
+ const struct pcap_pkthdr *h, const u_char *p)
+{
+ u_int length = h->len;
+ u_int caplen = h->caplen;
+
+ ndo->ndo_protocol = "mfr_if";
+ ND_TCHECK_2(p); /* minimum frame header length */
+
+ if ((length = mfr_print(ndo, p, length)) == 0)
+ return (0);
+ else
+ return length;
+trunc:
+ nd_print_trunc(ndo);
+ return caplen;
+}
+
#define MFR_CTRL_MSG_ADD_LINK 1
#define MFR_CTRL_MSG_ADD_LINK_ACK 2
#define MFR_CTRL_MSG_REMOVE_LINK 6
#define MFR_CTRL_MSG_REMOVE_LINK_ACK 7
-struct tok mfr_ctrl_msg_values[] = {
+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" },
#define MFR_CTRL_IE_VENDOR_EXT 6
#define MFR_CTRL_IE_CAUSE 7
-struct tok mfr_ctrl_ie_values[] = {
+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"},
#define MFR_ID_STRING_MAXLEN 50
struct ie_tlv_header_t {
- u_int8_t ie_type;
- u_int8_t ie_len;
+ uint8_t ie_type;
+ uint8_t ie_len;
};
u_int
-mfr_print(register const u_char *p, u_int length)
+mfr_print(netdissect_options *ndo,
+ 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;
+ 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 |
* +----+----+----+----+----+----+----+----+
*/
- TCHECK2(*p, 4); /* minimum frame header length */
+ ndo->ndo_protocol = "mfr";
+
+ if (length < 4) { /* minimum frame header length */
+ ND_PRINT("[length %u < 4]", length);
+ nd_print_invalid(ndo);
+ return length;
+ }
+ ND_TCHECK_4(p);
- if ((p[0] & MFR_BEC_MASK) == MFR_CTRL_FRAME && p[1] == 0) {
- printf("FRF.16 Control, %s, length %u",
- tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",p[2]),
+ if ((GET_U_1(p) & MFR_BEC_MASK) == MFR_CTRL_FRAME && GET_U_1(p + 1) == 0) {
+ ND_PRINT("FRF.16 Control, Flags [%s], %s, length %u",
+ bittok2str(frf_flag_values,"none",(GET_U_1(p) & MFR_BEC_MASK)),
+ tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",GET_U_1(p + 2)),
length);
tptr = p + 3;
tlen = length -3;
hdr_len = 3;
- if (!vflag)
+ if (!ndo->ndo_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];
+ ND_TCHECK_LEN(tptr, sizeof(struct ie_tlv_header_t));
+ ie_type=GET_U_1(tptr);
+ ie_len=GET_U_1(tptr + 1);
- printf("\n\tIE %s (%u), length %u: ",
+ ND_PRINT("\n\tIE %s (%u), length %u: ",
tok2str(mfr_ctrl_ie_values,"Unknown",ie_type),
ie_type,
ie_len);
if (ie_type == 0 || ie_len <= sizeof(struct ie_tlv_header_t))
return hdr_len;
- TCHECK2(*tptr,ie_len);
+ ND_TCHECK_LEN(tptr, ie_len);
tptr+=sizeof(struct ie_tlv_header_t);
/* tlv len includes header */
ie_len-=sizeof(struct ie_tlv_header_t);
switch (ie_type) {
case MFR_CTRL_IE_MAGIC_NUM:
- printf("0x%08x",EXTRACT_32BITS(tptr));
+ /* FRF.16.1 Section 3.4.3 Magic Number Information Element */
+ if (ie_len != 4) {
+ ND_PRINT("[IE data length %d != 4]", ie_len);
+ nd_print_invalid(ndo);
+ break;
+ }
+ ND_PRINT("0x%08x", GET_BE_U_4(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));
+ if (GET_U_1(tptr + idx) != 0) /* don't print null termination */
+ fn_print_char(ndo, GET_U_1(tptr + idx));
else
break;
}
case MFR_CTRL_IE_TIMESTAMP:
if (ie_len == sizeof(struct timeval)) {
- ts_print((const struct timeval *)tptr);
+ ts_print(ndo, (const struct timeval *)tptr);
break;
}
/* fall through and hexdump if no unix timestamp */
+ ND_FALL_THROUGH;
/*
* FIXME those are the defined IEs that lack a decoder
case MFR_CTRL_IE_CAUSE:
default:
- if (vflag <= 1)
- print_unknown_data(tptr,"\n\t ",ie_len);
+ 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 (vflag > 1 )
- print_unknown_data(tptr,"\n\t ",ie_len);
-
+ if (ndo->ndo_vflag > 1 )
+ print_unknown_data(ndo, tptr, "\n\t ", ie_len);
+
tlen-=ie_len;
tptr+=ie_len;
}
}
/*
* FRF.16 Fragmentation Frame
- *
+ *
* 7 6 5 4 3 2 1 0
* +----+----+----+----+----+----+----+----+
- * | B | E | C=0|seq. (high 4 bits) | EA |
+ * | B | E | C=0|seq. (high 4 bits) | EA |
* +----+----+----+----+----+----+----+----+
* | sequence (low 8 bits) |
* +----+----+----+----+----+----+----+----+
- * | DLCI (6 bits) | CR | EA |
+ * | DLCI (6 bits) | CR | EA |
* +----+----+----+----+----+----+----+----+
* | DLCI (4 bits) |FECN|BECN| DE | EA |
* +----+----+----+----+----+----+----+----+
*/
- if ((p[0] & MFR_BEC_MASK) == MFR_FRAG_FRAME) {
- sequence_num = (p[0]&0x1e)<<7 | p[1];
- if (eflag)
- printf("FRF.16 Frag, seq %u, ", sequence_num);
+ sequence_num = (GET_U_1(p)&0x1e)<<7 | GET_U_1(p + 1);
+ /* whole packet or first fragment ? */
+ if ((GET_U_1(p) & MFR_BEC_MASK) == MFR_FRAG_FRAME ||
+ (GET_U_1(p) & MFR_BEC_MASK) == MFR_B_BIT) {
+ ND_PRINT("FRF.16 Frag, seq %u, Flags [%s], ",
+ sequence_num,
+ bittok2str(frf_flag_values,"none",(GET_U_1(p) & MFR_BEC_MASK)));
hdr_len = 2;
- fr_print(p+hdr_len,length-hdr_len);
+ fr_print(ndo, p+hdr_len,length-hdr_len);
+ return hdr_len;
}
+ /* must be a middle or the last fragment */
+ ND_PRINT("FRF.16 Frag, seq %u, Flags [%s]",
+ sequence_num,
+ bittok2str(frf_flag_values,"none",(GET_U_1(p) & MFR_BEC_MASK)));
+ print_unknown_data(ndo, p, "\n\t", length);
+
return hdr_len;
- trunc:
- printf("[|mfr]");
+trunc:
+ nd_print_trunc(ndo);
return length;
}
/* an NLPID of 0xb1 indicates a 2-byte
* FRF.15 header
- *
+ *
* 7 6 5 4 3 2 1 0
* +----+----+----+----+----+----+----+----+
* ~ Q.922 header ~
* +----+----+----+----+----+----+----+----+
*/
-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;
+frf15_print(netdissect_options *ndo,
+ const u_char *p, u_int length)
+{
+ uint16_t sequence_num, flags;
+
+ if (length < 2)
+ goto trunc;
+ ND_TCHECK_2(p);
- flags = p[0]&0xe0;
- sequence_num = (p[0]&0x1e)<<7 | p[1];
+ flags = GET_U_1(p)&MFR_BEC_MASK;
+ sequence_num = (GET_U_1(p)&0x1e)<<7 | GET_U_1(p + 1);
- printf("FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u",
+ ND_PRINT("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",
+ bittok2str(frf_flag_values,"none",flags),
+ GET_U_1(p)&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End",
length);
/* TODO:
* model is end-to-end or interface based wether we want to print
* another Q.922 header
*/
+ return;
+trunc:
+ nd_print_trunc(ndo);
}
/*
*/
/* 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
-struct tok fr_q933_msg_values[] = {
+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" },
{ 0, NULL }
};
-#define MSG_ANSI_LOCKING_SHIFT 0x95
+#define IE_IS_SINGLE_OCTET(iecode) ((iecode) & 0x80)
+#define IE_IS_SHIFT(iecode) (((iecode) & 0xF0) == 0x90)
+#define IE_SHIFT_IS_NON_LOCKING(iecode) ((iecode) & 0x08)
+#define IE_SHIFT_IS_LOCKING(iecode) (!(IE_SHIFT_IS_NON_LOCKING(iecode)))
+#define IE_SHIFT_CODESET(iecode) ((iecode) & 0x07)
#define FR_LMI_ANSI_REPORT_TYPE_IE 0x01
#define FR_LMI_ANSI_LINK_VERIFY_IE_91 0x19 /* details? */
#define FR_LMI_CCITT_LINK_VERIFY_IE 0x53
#define FR_LMI_CCITT_PVC_STATUS_IE 0x57
-struct tok fr_q933_ie_values_codeset5[] = {
+static const struct tok fr_q933_ie_values_codeset_0_5[] = {
{ 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" },
#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[] = {
+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 struct tok *fr_q933_ie_codesets[] = {
+/* array of 16 codesets - currently we only support codepage 0 and 5 */
+static const struct tok *fr_q933_ie_codesets[] = {
+ fr_q933_ie_values_codeset_0_5,
NULL,
- fr_q933_ie_values_codeset5,
NULL,
NULL,
NULL,
- fr_q933_ie_values_codeset5,
+ fr_q933_ie_values_codeset_0_5,
NULL,
NULL,
NULL,
NULL
};
-static int fr_q933_print_ie_codeset5(const struct ie_tlv_header_t *ie_p,
- const u_char *p);
+static int fr_q933_print_ie_codeset_0_5(netdissect_options *ndo, u_int iecode,
+ u_int ielength, const u_char *p);
-typedef int (*codeset_pr_func_t)(const struct ie_tlv_header_t *ie_p,
- const u_char *p);
+typedef int (*codeset_pr_func_t)(netdissect_options *, u_int iecode,
+ u_int ielength, 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[] = {
+/* array of 16 codesets - currently we only support codepage 0 and 5 */
+static const codeset_pr_func_t fr_q933_print_ie_codeset[] = {
+ fr_q933_print_ie_codeset_0_5,
NULL,
- fr_q933_print_ie_codeset5,
NULL,
NULL,
NULL,
- fr_q933_print_ie_codeset5,
+ fr_q933_print_ie_codeset_0_5,
NULL,
NULL,
NULL,
NULL
};
+/*
+ * ITU-T Q.933.
+ *
+ * p points to octet 2, the octet containing the length of the
+ * call reference value, so p[n] is octet n+2 ("octet X" is as
+ * used in Q.931/Q.933).
+ *
+ * XXX - actually used both for Q.931 and Q.933.
+ */
void
-q933_print(const u_char *p, u_int length)
+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 */
- printf("[|q.933]");
- return;
+ u_int olen;
+ u_int call_ref_length, i;
+ uint8_t call_ref[15]; /* maximum length - length field is 4 bits */
+ u_int msgtype;
+ u_int iecode;
+ u_int ielength;
+ u_int codeset = 0;
+ u_int is_ansi = 0;
+ u_int ie_is_known;
+ u_int non_locking_shift;
+ u_int unshift_codeset;
+
+ ndo->ndo_protocol = "q.933";
+ ND_PRINT("%s", ndo->ndo_eflag ? "" : "Q.933");
+
+ if (length == 0 || !ND_TTEST_1(p)) {
+ if (!ndo->ndo_eflag)
+ ND_PRINT(", ");
+ ND_PRINT("length %u", length);
+ goto trunc;
}
- codeset = p[2]&0x0f; /* extract the codeset */
+ /*
+ * Get the length of the call reference value.
+ */
+ olen = length; /* preserve the original length for display */
+ call_ref_length = GET_U_1(p) & 0x0f;
+ p++;
+ length--;
+
+ /*
+ * Get the call reference value.
+ */
+ for (i = 0; i < call_ref_length; i++) {
+ if (length == 0 || !ND_TTEST_1(p)) {
+ if (!ndo->ndo_eflag)
+ ND_PRINT(", ");
+ ND_PRINT("length %u", olen);
+ goto trunc;
+ }
+ call_ref[i] = GET_U_1(p);
+ p++;
+ length--;
+ }
- if (p[2] == MSG_ANSI_LOCKING_SHIFT)
- is_ansi = 1;
-
- printf("%s", eflag ? "" : "Q.933, ");
+ /*
+ * Get the message type.
+ */
+ if (length == 0 || !ND_TTEST_1(p)) {
+ if (!ndo->ndo_eflag)
+ ND_PRINT(", ");
+ ND_PRINT("length %u", olen);
+ goto trunc;
+ }
+ msgtype = GET_U_1(p);
+ p++;
+ length--;
+
+ /*
+ * Peek ahead to see if we start with a shift.
+ */
+ non_locking_shift = 0;
+ unshift_codeset = codeset;
+ if (length != 0) {
+ if (!ND_TTEST_1(p)) {
+ if (!ndo->ndo_eflag)
+ ND_PRINT(", ");
+ ND_PRINT("length %u", olen);
+ goto trunc;
+ }
+ iecode = GET_U_1(p);
+ if (IE_IS_SHIFT(iecode)) {
+ /*
+ * It's a shift. Skip over it.
+ */
+ p++;
+ length--;
+
+ /*
+ * Get the codeset.
+ */
+ codeset = IE_SHIFT_CODESET(iecode);
+
+ /*
+ * If it's a locking shift to codeset 5,
+ * mark this as ANSI. (XXX - 5 is actually
+ * for national variants in general, not
+ * the US variant in particular, but maybe
+ * this is more American exceptionalism. :-))
+ */
+ if (IE_SHIFT_IS_LOCKING(iecode)) {
+ /*
+ * It's a locking shift.
+ */
+ if (codeset == 5) {
+ /*
+ * It's a locking shift to
+ * codeset 5, so this is
+ * T1.617 Annex D.
+ */
+ is_ansi = 1;
+ }
+ } else {
+ /*
+ * It's a non-locking shift.
+ * Remember the current codeset, so we
+ * can revert to it after the next IE.
+ */
+ non_locking_shift = 1;
+ unshift_codeset = 0;
+ }
+ }
+ }
/* printing out header part */
- printf("%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset);
-
- 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;
+ if (!ndo->ndo_eflag)
+ ND_PRINT(", ");
+ ND_PRINT("%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset);
+
+ if (call_ref_length != 0) {
+ ND_TCHECK_1(p);
+ if (call_ref_length > 1 || GET_U_1(p) != 0) {
+ /*
+ * Not a dummy call reference.
+ */
+ ND_PRINT(", Call Ref: 0x");
+ for (i = 0; i < call_ref_length; i++)
+ ND_PRINT("%02x", call_ref[i]);
+ }
}
- 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 (vflag) /* not bark if there is just a trailer */
- printf("\n[|q.933]");
- else
- printf(", length %u",olen);
- return;
+ if (ndo->ndo_vflag) {
+ ND_PRINT(", %s (0x%02x), length %u",
+ tok2str(fr_q933_msg_values,
+ "unknown message", msgtype),
+ msgtype,
+ olen);
+ } else {
+ ND_PRINT(", %s",
+ tok2str(fr_q933_msg_values,
+ "unknown message 0x%02x", msgtype));
+ }
+
+ /* Loop through the rest of the IEs */
+ while (length != 0) {
+ /*
+ * What's the state of any non-locking shifts?
+ */
+ if (non_locking_shift == 1) {
+ /*
+ * There's a non-locking shift in effect for
+ * this IE. Count it, so we reset the codeset
+ * before the next IE.
+ */
+ non_locking_shift = 2;
+ } else if (non_locking_shift == 2) {
+ /*
+ * Unshift.
+ */
+ codeset = unshift_codeset;
+ non_locking_shift = 0;
}
- /* 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 (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);
-
- /* 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);
-
- length = length - ie_p->ie_len - 2;
- ptemp = ptemp + ie_p->ie_len + 2;
+ /*
+ * Get the first octet of the IE.
+ */
+ if (!ND_TTEST_1(p)) {
+ if (!ndo->ndo_vflag) {
+ ND_PRINT(", length %u", olen);
+ }
+ goto trunc;
+ }
+ iecode = GET_U_1(p);
+ p++;
+ length--;
+
+ /* Single-octet IE? */
+ if (IE_IS_SINGLE_OCTET(iecode)) {
+ /*
+ * Yes. Is it a shift?
+ */
+ if (IE_IS_SHIFT(iecode)) {
+ /*
+ * Yes. Is it locking?
+ */
+ if (IE_SHIFT_IS_LOCKING(iecode)) {
+ /*
+ * Yes.
+ */
+ non_locking_shift = 0;
+ } else {
+ /*
+ * No. Remember the current
+ * codeset, so we can revert
+ * to it after the next IE.
+ */
+ non_locking_shift = 1;
+ unshift_codeset = codeset;
+ }
+
+ /*
+ * Get the codeset.
+ */
+ codeset = IE_SHIFT_CODESET(iecode);
+ }
+ } else {
+ /*
+ * No. Get the IE length.
+ */
+ if (length == 0 || !ND_TTEST_1(p)) {
+ if (!ndo->ndo_vflag) {
+ ND_PRINT(", length %u", olen);
+ }
+ goto trunc;
+ }
+ ielength = GET_U_1(p);
+ p++;
+ length--;
+
+ /* lets do the full IE parsing only in verbose mode
+ * however some IEs (DLCI Status, Link Verify)
+ * are also interesting in non-verbose mode */
+ if (ndo->ndo_vflag) {
+ ND_PRINT("\n\t%s IE (0x%02x), length %u: ",
+ tok2str(fr_q933_ie_codesets[codeset],
+ "unknown", iecode),
+ iecode,
+ ielength);
+ }
+
+ /* sanity checks */
+ if (iecode == 0 || ielength == 0) {
+ return;
+ }
+ if (length < ielength || !ND_TTEST_LEN(p, ielength)) {
+ if (!ndo->ndo_vflag) {
+ ND_PRINT(", length %u", olen);
+ }
+ goto trunc;
+ }
+
+ ie_is_known = 0;
+ if (fr_q933_print_ie_codeset[codeset] != NULL) {
+ ie_is_known = fr_q933_print_ie_codeset[codeset](ndo, iecode, ielength, p);
+ }
+
+ if (ie_is_known) {
+ /*
+ * Known IE; do we want to see a hexdump
+ * of it?
+ */
+ if (ndo->ndo_vflag > 1) {
+ /* Yes. */
+ print_unknown_data(ndo, p, "\n\t ", ielength);
+ }
+ } else {
+ /*
+ * Unknown IE; if we're printing verbosely,
+ * print its content in hex.
+ */
+ if (ndo->ndo_vflag >= 1) {
+ print_unknown_data(ndo, p, "\n\t", ielength);
+ }
+ }
+
+ length -= ielength;
+ p += ielength;
+ }
+ }
+ if (!ndo->ndo_vflag) {
+ ND_PRINT(", length %u", olen);
}
- if (!vflag)
- printf(", length %u",olen);
+ return;
+
+trunc:
+ nd_print_trunc(ndo);
}
static int
-fr_q933_print_ie_codeset5(const struct ie_tlv_header_t *ie_p, const u_char *p)
+fr_q933_print_ie_codeset_0_5(netdissect_options *ndo, u_int iecode,
+ u_int ielength, const u_char *p)
{
u_int dlci;
- switch (ie_p->ie_type) {
+ switch (iecode) {
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]);
+ if (ielength < 1) {
+ if (!ndo->ndo_vflag) {
+ ND_PRINT(", ");
+ }
+ ND_PRINT("Invalid REPORT TYPE IE");
+ return 1;
+ }
+ if (ndo->ndo_vflag) {
+ ND_PRINT("%s (%u)",
+ tok2str(fr_lmi_report_type_ie_values,"unknown",GET_U_1(p)),
+ GET_U_1(p));
+ }
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]);
+ if (!ndo->ndo_vflag) {
+ ND_PRINT(", ");
+ }
+ if (ielength < 2) {
+ ND_PRINT("Invalid LINK VERIFY IE");
+ return 1;
+ }
+ ND_PRINT("TX Seq: %3d, RX Seq: %3d", GET_U_1(p), GET_U_1(p + 1));
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");
+ if (!ndo->ndo_vflag) {
+ ND_PRINT(", ");
+ }
+ /* now parse the DLCI information element. */
+ if ((ielength < 3) ||
+ (GET_U_1(p) & 0x80) ||
+ ((ielength == 3) && !(GET_U_1(p + 1) & 0x80)) ||
+ ((ielength == 4) &&
+ ((GET_U_1(p + 1) & 0x80) || !(GET_U_1(p + 2) & 0x80))) ||
+ ((ielength == 5) &&
+ ((GET_U_1(p + 1) & 0x80) || (GET_U_1(p + 2) & 0x80) ||
+ !(GET_U_1(p + 3) & 0x80))) ||
+ (ielength > 5) ||
+ !(GET_U_1(p + ielength - 1) & 0x80)) {
+ ND_PRINT("Invalid DLCI in PVC STATUS IE");
+ return 1;
+ }
+
+ dlci = ((GET_U_1(p) & 0x3F) << 4) | ((GET_U_1(p + 1) & 0x78) >> 3);
+ if (ielength == 4) {
+ dlci = (dlci << 6) | ((GET_U_1(p + 2) & 0x7E) >> 1);
+ }
+ else if (ielength == 5) {
+ dlci = (dlci << 13) | (GET_U_1(p + 2) & 0x7F) | ((GET_U_1(p + 3) & 0x7E) >> 1);
+ }
+
+ ND_PRINT("DLCI %u: status %s%s", dlci,
+ GET_U_1(p + ielength - 1) & 0x8 ? "New, " : "",
+ GET_U_1(p + ielength - 1) & 0x2 ? "Active" : "Inactive");
return 1;
}
projects / tcpdump / blobdiff