* FOR A PARTICULAR PURPOSE.
*
*/
-#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-ldp.c,v 1.1 2002-12-13 00:40:35 hannes Exp $";
-#endif
-
+#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
#include "interface.h"
#include "extract.h"
#include "addrtoname.h"
-#include "ethertype.h"
+
+#include "l2vpn.h"
+#include "af.h"
/*
* ldp common header
*/
struct ldp_common_header {
- u_int8_t version[2];
- u_int8_t pdu_length[2];
- u_int8_t lsr_id[4];
- u_int8_t label_space[2];
+ uint8_t version[2];
+ uint8_t pdu_length[2];
+ uint8_t lsr_id[4];
+ uint8_t label_space[2];
};
#define LDP_VERSION 1
-/*
+/*
+ * ldp message header
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |U| Message Type | Message Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Message ID |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | |
+ * + +
+ * | Mandatory Parameters |
+ * + +
+ * | |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | |
+ * + +
+ * | Optional Parameters |
+ * + +
+ * | |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+struct ldp_msg_header {
+ uint8_t type[2];
+ uint8_t length[2];
+ uint8_t id[4];
+};
+
+#define LDP_MASK_MSG_TYPE(x) ((x)&0x7fff)
+#define LDP_MASK_U_BIT(x) ((x)&0x8000)
+
+#define LDP_MSG_NOTIF 0x0001
+#define LDP_MSG_HELLO 0x0100
+#define LDP_MSG_INIT 0x0200
+#define LDP_MSG_KEEPALIVE 0x0201
+#define LDP_MSG_ADDRESS 0x0300
+#define LDP_MSG_ADDRESS_WITHDRAW 0x0301
+#define LDP_MSG_LABEL_MAPPING 0x0400
+#define LDP_MSG_LABEL_REQUEST 0x0401
+#define LDP_MSG_LABEL_WITHDRAW 0x0402
+#define LDP_MSG_LABEL_RELEASE 0x0403
+#define LDP_MSG_LABEL_ABORT_REQUEST 0x0404
+
+#define LDP_VENDOR_PRIVATE_MIN 0x3e00
+#define LDP_VENDOR_PRIVATE_MAX 0x3eff
+#define LDP_EXPERIMENTAL_MIN 0x3f00
+#define LDP_EXPERIMENTAL_MAX 0x3fff
+
+static const struct tok ldp_msg_values[] = {
+ { LDP_MSG_NOTIF, "Notification" },
+ { LDP_MSG_HELLO, "Hello" },
+ { LDP_MSG_INIT, "Initialization" },
+ { LDP_MSG_KEEPALIVE, "Keepalive" },
+ { LDP_MSG_ADDRESS, "Address" },
+ { LDP_MSG_ADDRESS_WITHDRAW, "Address Withdraw" },
+ { LDP_MSG_LABEL_MAPPING, "Label Mapping" },
+ { LDP_MSG_LABEL_REQUEST, "Label Request" },
+ { LDP_MSG_LABEL_WITHDRAW, "Label Withdraw" },
+ { LDP_MSG_LABEL_RELEASE, "Label Release" },
+ { LDP_MSG_LABEL_ABORT_REQUEST, "Label Abort Request" },
+ { 0, NULL}
+};
+
+#define LDP_MASK_TLV_TYPE(x) ((x)&0x3fff)
+#define LDP_MASK_F_BIT(x) ((x)&0x4000)
+
+#define LDP_TLV_FEC 0x0100
+#define LDP_TLV_ADDRESS_LIST 0x0101
+#define LDP_TLV_ADDRESS_LIST_AFNUM_LEN 2
+#define LDP_TLV_HOP_COUNT 0x0103
+#define LDP_TLV_PATH_VECTOR 0x0104
+#define LDP_TLV_GENERIC_LABEL 0x0200
+#define LDP_TLV_ATM_LABEL 0x0201
+#define LDP_TLV_FR_LABEL 0x0202
+#define LDP_TLV_STATUS 0x0300
+#define LDP_TLV_EXTD_STATUS 0x0301
+#define LDP_TLV_RETURNED_PDU 0x0302
+#define LDP_TLV_RETURNED_MSG 0x0303
+#define LDP_TLV_COMMON_HELLO 0x0400
+#define LDP_TLV_IPV4_TRANSPORT_ADDR 0x0401
+#define LDP_TLV_CONFIG_SEQ_NUMBER 0x0402
+#define LDP_TLV_IPV6_TRANSPORT_ADDR 0x0403
+#define LDP_TLV_COMMON_SESSION 0x0500
+#define LDP_TLV_ATM_SESSION_PARM 0x0501
+#define LDP_TLV_FR_SESSION_PARM 0x0502
+#define LDP_TLV_FT_SESSION 0x0503
+#define LDP_TLV_LABEL_REQUEST_MSG_ID 0x0600
+#define LDP_TLV_MTU 0x0601 /* rfc 3988 */
+
+static const struct tok ldp_tlv_values[] = {
+ { LDP_TLV_FEC, "FEC" },
+ { LDP_TLV_ADDRESS_LIST, "Address List" },
+ { LDP_TLV_HOP_COUNT, "Hop Count" },
+ { LDP_TLV_PATH_VECTOR, "Path Vector" },
+ { LDP_TLV_GENERIC_LABEL, "Generic Label" },
+ { LDP_TLV_ATM_LABEL, "ATM Label" },
+ { LDP_TLV_FR_LABEL, "Frame-Relay Label" },
+ { LDP_TLV_STATUS, "Status" },
+ { LDP_TLV_EXTD_STATUS, "Extended Status" },
+ { LDP_TLV_RETURNED_PDU, "Returned PDU" },
+ { LDP_TLV_RETURNED_MSG, "Returned Message" },
+ { LDP_TLV_COMMON_HELLO, "Common Hello Parameters" },
+ { LDP_TLV_IPV4_TRANSPORT_ADDR, "IPv4 Transport Address" },
+ { LDP_TLV_CONFIG_SEQ_NUMBER, "Configuration Sequence Number" },
+ { LDP_TLV_IPV6_TRANSPORT_ADDR, "IPv6 Transport Address" },
+ { LDP_TLV_COMMON_SESSION, "Common Session Parameters" },
+ { LDP_TLV_ATM_SESSION_PARM, "ATM Session Parameters" },
+ { LDP_TLV_FR_SESSION_PARM, "Frame-Relay Session Parameters" },
+ { LDP_TLV_FT_SESSION, "Fault-Tolerant Session Parameters" },
+ { LDP_TLV_LABEL_REQUEST_MSG_ID, "Label Request Message ID" },
+ { LDP_TLV_MTU, "MTU" },
+ { 0, NULL}
+};
+
+#define LDP_FEC_WILDCARD 0x01
+#define LDP_FEC_PREFIX 0x02
+#define LDP_FEC_HOSTADDRESS 0x03
+/* From RFC 4906; should probably be updated to RFC 4447 (e.g., VC -> PW) */
+#define LDP_FEC_MARTINI_VC 0x80
+
+static const struct tok ldp_fec_values[] = {
+ { LDP_FEC_WILDCARD, "Wildcard" },
+ { LDP_FEC_PREFIX, "Prefix" },
+ { LDP_FEC_HOSTADDRESS, "Host address" },
+ { LDP_FEC_MARTINI_VC, "Martini VC" },
+ { 0, NULL}
+};
+
+#define LDP_FEC_MARTINI_IFPARM_MTU 0x01
+#define LDP_FEC_MARTINI_IFPARM_DESC 0x03
+#define LDP_FEC_MARTINI_IFPARM_VCCV 0x0c
+
+static const struct tok ldp_fec_martini_ifparm_values[] = {
+ { LDP_FEC_MARTINI_IFPARM_MTU, "MTU" },
+ { LDP_FEC_MARTINI_IFPARM_DESC, "Description" },
+ { LDP_FEC_MARTINI_IFPARM_VCCV, "VCCV" },
+ { 0, NULL}
+};
+
+/* draft-ietf-pwe3-vccv-04.txt */
+static const struct tok ldp_fec_martini_ifparm_vccv_cc_values[] = {
+ { 0x01, "PWE3 control word" },
+ { 0x02, "MPLS Router Alert Label" },
+ { 0x04, "MPLS inner label TTL = 1" },
+ { 0, NULL}
+};
+
+/* draft-ietf-pwe3-vccv-04.txt */
+static const struct tok ldp_fec_martini_ifparm_vccv_cv_values[] = {
+ { 0x01, "ICMP Ping" },
+ { 0x02, "LSP Ping" },
+ { 0x04, "BFD" },
+ { 0, NULL}
+};
+
+static int ldp_pdu_print(netdissect_options *, register const u_char *);
+
+/*
* ldp tlv header
*
* 0 1 2 3
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
-struct ldp_tlv_header {
- u_int8_t type[2];
- u_int8_t length[2];
-};
+#define TLV_TCHECK(minlen) \
+ ND_TCHECK2(*tptr, minlen); if (tlv_tlen < minlen) goto badtlv;
-#define LDP_MASK_TLV_TYPE(x) ((x)&0x3fff)
-#define LDP_MASK_TLV_U_BIT(x) ((x)&0x8000)
-#define LDP_MASK_TLV_F_BIT(x) ((x)&0x4000)
+static int
+ldp_tlv_print(netdissect_options *ndo,
+ register const u_char *tptr,
+ u_short msg_tlen) {
-#define LDP_TLV_FEC 0x0100
-#define LDP_TLV_ADDRESS_LIST 0x0101
-#define LDP_TLV_HOP_COUNT 0x0103
-#define LDP_TLV_PATH_VECTOR 0x0104
-#define LDP_TLV_GENERIC_LABEL 0x0200
-#define LDP_TLV_ATM_LABEL 0x0201
-#define LDP_TLV_FR_LABEL 0x0202
-#define LDP_TLV_STATUS 0x0300
+ struct ldp_tlv_header {
+ uint8_t type[2];
+ uint8_t length[2];
+ };
-static const struct tok ldp_tlv_values[] = {
- { LDP_TLV_FEC, "FEC" },
- { LDP_TLV_ADDRESS_LIST, "Address List" },
- { LDP_TLV_HOP_COUNT, "Hop Count" },
- { LDP_TLV_HOP_COUNT, "Path Vector" },
- { LDP_TLV_GENERIC_LABEL, "Generic Label" },
- { LDP_TLV_ATM_LABEL, "ATM Label" },
- { LDP_TLV_FR_LABEL, "Frame-Relay Label" },
- { LDP_TLV_STATUS, "Status" },
- { 0, NULL}
-};
+ const struct ldp_tlv_header *ldp_tlv_header;
+ u_short tlv_type,tlv_len,tlv_tlen,af,ft_flags;
+ u_char fec_type;
+ u_int ui,vc_info_len, vc_info_tlv_type, vc_info_tlv_len,idx;
+ char buf[100];
+ int i;
+
+ ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
+ ND_TCHECK(*ldp_tlv_header);
+ tlv_len=EXTRACT_16BITS(ldp_tlv_header->length);
+ if (tlv_len + 4 > msg_tlen) {
+ ND_PRINT((ndo, "\n\t\t TLV contents go past end of message"));
+ return 0;
+ }
+ tlv_tlen=tlv_len;
+ tlv_type=LDP_MASK_TLV_TYPE(EXTRACT_16BITS(ldp_tlv_header->type));
+
+ /* FIXME vendor private / experimental check */
+ ND_PRINT((ndo, "\n\t %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
+ tok2str(ldp_tlv_values,
+ "Unknown",
+ tlv_type),
+ tlv_type,
+ tlv_len,
+ LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "continue processing" : "ignore",
+ LDP_MASK_F_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "do" : "don't"));
+
+ tptr+=sizeof(struct ldp_tlv_header);
+
+ switch(tlv_type) {
-#define FALSE 0
-#define TRUE 1
+ case LDP_TLV_COMMON_HELLO:
+ TLV_TCHECK(4);
+ ND_PRINT((ndo, "\n\t Hold Time: %us, Flags: [%s Hello%s]",
+ EXTRACT_16BITS(tptr),
+ (EXTRACT_16BITS(tptr+2)&0x8000) ? "Targeted" : "Link",
+ (EXTRACT_16BITS(tptr+2)&0x4000) ? ", Request for targeted Hellos" : ""));
+ break;
+
+ case LDP_TLV_IPV4_TRANSPORT_ADDR:
+ TLV_TCHECK(4);
+ ND_PRINT((ndo, "\n\t IPv4 Transport Address: %s", ipaddr_string(ndo, tptr)));
+ break;
+#ifdef INET6
+ case LDP_TLV_IPV6_TRANSPORT_ADDR:
+ TLV_TCHECK(16);
+ ND_PRINT((ndo, "\n\t IPv6 Transport Address: %s", ip6addr_string(ndo, tptr)));
+ break;
+#endif
+ case LDP_TLV_CONFIG_SEQ_NUMBER:
+ TLV_TCHECK(4);
+ ND_PRINT((ndo, "\n\t Sequence Number: %u", EXTRACT_32BITS(tptr)));
+ break;
+
+ case LDP_TLV_ADDRESS_LIST:
+ TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN);
+ af = EXTRACT_16BITS(tptr);
+ tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
+ tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
+ ND_PRINT((ndo, "\n\t Address Family: %s, addresses",
+ tok2str(af_values, "Unknown (%u)", af)));
+ switch (af) {
+ case AFNUM_INET:
+ while(tlv_tlen >= sizeof(struct in_addr)) {
+ ND_TCHECK2(*tptr, sizeof(struct in_addr));
+ ND_PRINT((ndo, " %s", ipaddr_string(ndo, tptr)));
+ tlv_tlen-=sizeof(struct in_addr);
+ tptr+=sizeof(struct in_addr);
+ }
+ break;
+#ifdef INET6
+ case AFNUM_INET6:
+ while(tlv_tlen >= sizeof(struct in6_addr)) {
+ ND_TCHECK2(*tptr, sizeof(struct in6_addr));
+ ND_PRINT((ndo, " %s", ip6addr_string(ndo, tptr)));
+ tlv_tlen-=sizeof(struct in6_addr);
+ tptr+=sizeof(struct in6_addr);
+ }
+ break;
+#endif
+ default:
+ /* unknown AF */
+ break;
+ }
+ break;
+
+ case LDP_TLV_COMMON_SESSION:
+ TLV_TCHECK(8);
+ ND_PRINT((ndo, "\n\t Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
+ EXTRACT_16BITS(tptr), EXTRACT_16BITS(tptr+2),
+ (EXTRACT_16BITS(tptr+6)&0x8000) ? "On Demand" : "Unsolicited",
+ (EXTRACT_16BITS(tptr+6)&0x4000) ? "Enabled" : "Disabled"
+ ));
+ break;
+
+ case LDP_TLV_FEC:
+ TLV_TCHECK(1);
+ fec_type = *tptr;
+ ND_PRINT((ndo, "\n\t %s FEC (0x%02x)",
+ tok2str(ldp_fec_values, "Unknown", fec_type),
+ fec_type));
+
+ tptr+=1;
+ tlv_tlen-=1;
+ switch(fec_type) {
+
+ case LDP_FEC_WILDCARD:
+ break;
+ case LDP_FEC_PREFIX:
+ TLV_TCHECK(2);
+ af = EXTRACT_16BITS(tptr);
+ tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
+ tlv_tlen-=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
+ if (af == AFNUM_INET) {
+ i=decode_prefix4(ndo, tptr, tlv_tlen, buf, sizeof(buf));
+ if (i == -2)
+ goto trunc;
+ if (i == -3)
+ ND_PRINT((ndo, ": IPv4 prefix (goes past end of TLV)"));
+ else if (i == -1)
+ ND_PRINT((ndo, ": IPv4 prefix (invalid length)"));
+ else
+ ND_PRINT((ndo, ": IPv4 prefix %s", buf));
+ }
+#ifdef INET6
+ else if (af == AFNUM_INET6) {
+ i=decode_prefix6(ndo, tptr, tlv_tlen, buf, sizeof(buf));
+ if (i == -2)
+ goto trunc;
+ if (i == -3)
+ ND_PRINT((ndo, ": IPv4 prefix (goes past end of TLV)"));
+ else if (i == -1)
+ ND_PRINT((ndo, ": IPv6 prefix (invalid length)"));
+ else
+ ND_PRINT((ndo, ": IPv6 prefix %s", buf));
+ }
+#endif
+ else
+ ND_PRINT((ndo, ": Address family %u prefix", af));
+ break;
+ case LDP_FEC_HOSTADDRESS:
+ break;
+ case LDP_FEC_MARTINI_VC:
+ /*
+ * According to RFC 4908, the VC info Length field can be zero,
+ * in which case not only are there no interface parameters,
+ * there's no VC ID.
+ */
+ TLV_TCHECK(7);
+ vc_info_len = *(tptr+2);
+
+ if (vc_info_len == 0) {
+ ND_PRINT((ndo, ": %s, %scontrol word, group-ID %u, VC-info-length: %u",
+ tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
+ EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
+ EXTRACT_32BITS(tptr+3),
+ vc_info_len));
+ break;
+ }
+
+ /* Make sure we have the VC ID as well */
+ TLV_TCHECK(11);
+ ND_PRINT((ndo, ": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
+ tok2str(l2vpn_encaps_values, "Unknown", EXTRACT_16BITS(tptr)&0x7fff),
+ EXTRACT_16BITS(tptr)&0x8000 ? "" : "no ",
+ EXTRACT_32BITS(tptr+3),
+ EXTRACT_32BITS(tptr+7),
+ vc_info_len));
+ if (vc_info_len < 4) {
+ /* minimum 4, for the VC ID */
+ ND_PRINT((ndo, " (invalid, < 4"));
+ return(tlv_len+4); /* Type & Length fields not included */
+ }
+ vc_info_len -= 4; /* subtract out the VC ID, giving the length of the interface parameters */
+
+ /* Skip past the fixed information and the VC ID */
+ tptr+=11;
+ tlv_tlen-=11;
+ TLV_TCHECK(vc_info_len);
+
+ while (vc_info_len > 2) {
+ vc_info_tlv_type = *tptr;
+ vc_info_tlv_len = *(tptr+1);
+ if (vc_info_tlv_len < 2)
+ break;
+ if (vc_info_len < vc_info_tlv_len)
+ break;
+
+ ND_PRINT((ndo, "\n\t\tInterface Parameter: %s (0x%02x), len %u",
+ tok2str(ldp_fec_martini_ifparm_values,"Unknown",vc_info_tlv_type),
+ vc_info_tlv_type,
+ vc_info_tlv_len));
+
+ switch(vc_info_tlv_type) {
+ case LDP_FEC_MARTINI_IFPARM_MTU:
+ ND_PRINT((ndo, ": %u", EXTRACT_16BITS(tptr+2)));
+ break;
+
+ case LDP_FEC_MARTINI_IFPARM_DESC:
+ ND_PRINT((ndo, ": "));
+ for (idx = 2; idx < vc_info_tlv_len; idx++)
+ safeputchar(ndo, *(tptr + idx));
+ break;
+
+ case LDP_FEC_MARTINI_IFPARM_VCCV:
+ ND_PRINT((ndo, "\n\t\t Control Channels (0x%02x) = [%s]",
+ *(tptr+2),
+ bittok2str(ldp_fec_martini_ifparm_vccv_cc_values, "none", *(tptr+2))));
+ ND_PRINT((ndo, "\n\t\t CV Types (0x%02x) = [%s]",
+ *(tptr+3),
+ bittok2str(ldp_fec_martini_ifparm_vccv_cv_values, "none", *(tptr+3))));
+ break;
+
+ default:
+ print_unknown_data(ndo, tptr+2, "\n\t\t ", vc_info_tlv_len-2);
+ break;
+ }
+
+ vc_info_len -= vc_info_tlv_len;
+ tptr += vc_info_tlv_len;
+ }
+ break;
+ }
+
+ break;
+
+ case LDP_TLV_GENERIC_LABEL:
+ TLV_TCHECK(4);
+ ND_PRINT((ndo, "\n\t Label: %u", EXTRACT_32BITS(tptr) & 0xfffff));
+ break;
+
+ case LDP_TLV_STATUS:
+ TLV_TCHECK(8);
+ ui = EXTRACT_32BITS(tptr);
+ tptr+=4;
+ ND_PRINT((ndo, "\n\t Status: 0x%02x, Flags: [%s and %s forward]",
+ ui&0x3fffffff,
+ ui&0x80000000 ? "Fatal error" : "Advisory Notification",
+ ui&0x40000000 ? "do" : "don't"));
+ ui = EXTRACT_32BITS(tptr);
+ tptr+=4;
+ if (ui)
+ ND_PRINT((ndo, ", causing Message ID: 0x%08x", ui));
+ break;
+
+ case LDP_TLV_FT_SESSION:
+ TLV_TCHECK(8);
+ ft_flags = EXTRACT_16BITS(tptr);
+ ND_PRINT((ndo, "\n\t Flags: [%sReconnect, %sSave State, %sAll-Label Protection, %s Checkpoint, %sRe-Learn State]",
+ ft_flags&0x8000 ? "" : "No ",
+ ft_flags&0x8 ? "" : "Don't ",
+ ft_flags&0x4 ? "" : "No ",
+ ft_flags&0x2 ? "Sequence Numbered Label" : "All Labels",
+ ft_flags&0x1 ? "" : "Don't "));
+ tptr+=4;
+ ui = EXTRACT_32BITS(tptr);
+ if (ui)
+ ND_PRINT((ndo, ", Reconnect Timeout: %ums", ui));
+ tptr+=4;
+ ui = EXTRACT_32BITS(tptr);
+ if (ui)
+ ND_PRINT((ndo, ", Recovery Time: %ums", ui));
+ break;
+
+ case LDP_TLV_MTU:
+ TLV_TCHECK(2);
+ ND_PRINT((ndo, "\n\t MTU: %u", EXTRACT_16BITS(tptr)));
+ break;
+
+
+ /*
+ * FIXME those are the defined TLVs that lack a decoder
+ * you are welcome to contribute code ;-)
+ */
+
+ case LDP_TLV_HOP_COUNT:
+ case LDP_TLV_PATH_VECTOR:
+ case LDP_TLV_ATM_LABEL:
+ case LDP_TLV_FR_LABEL:
+ case LDP_TLV_EXTD_STATUS:
+ case LDP_TLV_RETURNED_PDU:
+ case LDP_TLV_RETURNED_MSG:
+ case LDP_TLV_ATM_SESSION_PARM:
+ case LDP_TLV_FR_SESSION_PARM:
+ case LDP_TLV_LABEL_REQUEST_MSG_ID:
+
+ default:
+ if (ndo->ndo_vflag <= 1)
+ print_unknown_data(ndo, tptr, "\n\t ", tlv_tlen);
+ break;
+ }
+ return(tlv_len+4); /* Type & Length fields not included */
+
+trunc:
+ ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
+ return 0;
+
+badtlv:
+ ND_PRINT((ndo, "\n\t\t TLV contents go past end of TLV"));
+ return(tlv_len+4); /* Type & Length fields not included */
+}
void
-ldp_print(register const u_char *pptr, register u_int len) {
+ldp_print(netdissect_options *ndo,
+ register const u_char *pptr, register u_int len) {
+
+ int processed;
+ while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
+ processed = ldp_pdu_print(ndo, pptr);
+ if (processed == 0)
+ return;
+ len -= processed;
+ pptr += processed;
+ }
+}
+
+static int
+ldp_pdu_print(netdissect_options *ndo,
+ register const u_char *pptr) {
const struct ldp_common_header *ldp_com_header;
- const struct ldp_tlv_header *ldp_tlv_header;
- const u_char *tptr,*tlv_tptr;
- u_short tlen,tlv_len,tlv_type,tlv_tlen;
- int hexdump;
+ const struct ldp_msg_header *ldp_msg_header;
+ const u_char *tptr,*msg_tptr;
+ u_short tlen;
+ u_short pdu_len,msg_len,msg_type,msg_tlen;
+ int hexdump,processed;
- tptr=pptr;
ldp_com_header = (const struct ldp_common_header *)pptr;
- TCHECK(*ldp_com_header);
+ ND_TCHECK(*ldp_com_header);
/*
* Sanity checking of the header.
*/
if (EXTRACT_16BITS(&ldp_com_header->version) != LDP_VERSION) {
- printf("LDP version %u packet not supported",
- EXTRACT_16BITS(&ldp_com_header->version));
- return;
+ ND_PRINT((ndo, "%sLDP version %u packet not supported",
+ (ndo->ndo_vflag < 1) ? "" : "\n\t",
+ EXTRACT_16BITS(&ldp_com_header->version)));
+ return 0;
+ }
+
+ pdu_len = EXTRACT_16BITS(&ldp_com_header->pdu_length);
+ if (pdu_len < sizeof(const struct ldp_common_header)-4) {
+ /* length too short */
+ ND_PRINT((ndo, "%sLDP, pdu-length: %u (too short, < %u)",
+ (ndo->ndo_vflag < 1) ? "" : "\n\t",
+ pdu_len,
+ (u_int)(sizeof(const struct ldp_common_header)-4)));
+ return 0;
}
/* print the LSR-ID, label-space & length */
- printf("%sLDP, Label-Space-ID: %s:%u, length: %u",
- (vflag < 1) ? "" : "\n\t",
- ipaddr_string(&ldp_com_header->lsr_id),
+ ND_PRINT((ndo, "%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
+ (ndo->ndo_vflag < 1) ? "" : "\n\t",
+ ipaddr_string(ndo, &ldp_com_header->lsr_id),
EXTRACT_16BITS(&ldp_com_header->label_space),
- len);
+ pdu_len));
- /* bail out if non-verbose */
- if (vflag < 1)
- return;
+ /* bail out if non-verbose */
+ if (ndo->ndo_vflag < 1)
+ return 0;
/* ok they seem to want to know everything - lets fully decode it */
- tlen=EXTRACT_16BITS(ldp_com_header->pdu_length);
-
- tptr+=sizeof(const struct ldp_common_header);
- tlen-=sizeof(const struct ldp_common_header);
+ tptr = pptr + sizeof(const struct ldp_common_header);
+ tlen = pdu_len - (sizeof(const struct ldp_common_header)-4); /* Type & Length fields not included */
while(tlen>0) {
- /* did we capture enough for fully decoding the tlv header ? */
- if (!TTEST2(*tptr, sizeof(struct ldp_tlv_header)))
- goto trunc;
+ /* did we capture enough for fully decoding the msg header ? */
+ ND_TCHECK2(*tptr, sizeof(struct ldp_msg_header));
- ldp_tlv_header = (const struct ldp_tlv_header *)tptr;
- tlv_len=EXTRACT_16BITS(ldp_tlv_header->length);
- tlv_type=LDP_MASK_TLV_TYPE(EXTRACT_16BITS(ldp_tlv_header->type));
+ ldp_msg_header = (const struct ldp_msg_header *)tptr;
+ msg_len=EXTRACT_16BITS(ldp_msg_header->length);
+ msg_type=LDP_MASK_MSG_TYPE(EXTRACT_16BITS(ldp_msg_header->type));
- printf("\n\t %s TLV (0x%04x), length: %u, Flags: [%s and %s forward if unknown]",
- tok2str(ldp_tlv_values,
+ if (msg_len < sizeof(struct ldp_msg_header)-4) {
+ /* length too short */
+ /* FIXME vendor private / experimental check */
+ ND_PRINT((ndo, "\n\t %s Message (0x%04x), length: %u (too short, < %u)",
+ tok2str(ldp_msg_values,
+ "Unknown",
+ msg_type),
+ msg_type,
+ msg_len,
+ (u_int)(sizeof(struct ldp_msg_header)-4)));
+ return 0;
+ }
+
+ /* FIXME vendor private / experimental check */
+ ND_PRINT((ndo, "\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
+ tok2str(ldp_msg_values,
"Unknown",
- tlv_type),
- tlv_type,
- tlv_len,
- LDP_MASK_TLV_U_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "continue processing" : "ignore all, notify",
- LDP_MASK_TLV_F_BIT(EXTRACT_16BITS(&ldp_tlv_header->type)) ? "do" : "don't");
-
- tlv_tptr=tptr+sizeof(struct ldp_tlv_header);
- tlv_tlen=tlv_len-sizeof(struct ldp_tlv_header);
-
- /* did we capture enough for fully decoding the object ? */
- if (!TTEST2(*tptr, tlv_len))
- goto trunc;
+ msg_type),
+ msg_type,
+ msg_len,
+ EXTRACT_32BITS(&ldp_msg_header->id),
+ LDP_MASK_U_BIT(EXTRACT_16BITS(&ldp_msg_header->type)) ? "continue processing" : "ignore"));
+
+ msg_tptr=tptr+sizeof(struct ldp_msg_header);
+ msg_tlen=msg_len-(sizeof(struct ldp_msg_header)-4); /* Type & Length fields not included */
+
+ /* did we capture enough for fully decoding the message ? */
+ ND_TCHECK2(*tptr, msg_len);
hexdump=FALSE;
- switch(tlv_type) {
-
+ switch(msg_type) {
+
+ case LDP_MSG_NOTIF:
+ case LDP_MSG_HELLO:
+ case LDP_MSG_INIT:
+ case LDP_MSG_KEEPALIVE:
+ case LDP_MSG_ADDRESS:
+ case LDP_MSG_LABEL_MAPPING:
+ case LDP_MSG_ADDRESS_WITHDRAW:
+ case LDP_MSG_LABEL_WITHDRAW:
+ while(msg_tlen >= 4) {
+ processed = ldp_tlv_print(ndo, msg_tptr, msg_tlen);
+ if (processed == 0)
+ break;
+ msg_tlen-=processed;
+ msg_tptr+=processed;
+ }
+ break;
+
/*
- * FIXME those are the defined objects that lack a decoder
+ * FIXME those are the defined messages that lack a decoder
* you are welcome to contribute code ;-)
*/
- case LDP_TLV_FEC:
- case LDP_TLV_ADDRESS_LIST:
- case LDP_TLV_HOP_COUNT:
- case LDP_TLV_PATH_VECTOR:
- case LDP_TLV_GENERIC_LABEL:
- case LDP_TLV_ATM_LABEL:
- case LDP_TLV_FR_LABEL:
- case LDP_TLV_STATUS:
+ case LDP_MSG_LABEL_REQUEST:
+ case LDP_MSG_LABEL_RELEASE:
+ case LDP_MSG_LABEL_ABORT_REQUEST:
+
default:
- if (vflag <= 1)
- print_unknown_data(tlv_tptr,"\n\t ",tlv_tlen);
+ if (ndo->ndo_vflag <= 1)
+ print_unknown_data(ndo, msg_tptr, "\n\t ", msg_tlen);
break;
}
/* do we want to see an additionally hexdump ? */
- if (vflag > 1 || hexdump==TRUE)
- print_unknown_data(tptr+sizeof(sizeof(struct ldp_tlv_header)),"\n\t ",
- tlv_len-sizeof(struct ldp_tlv_header));
+ if (ndo->ndo_vflag > 1 || hexdump==TRUE)
+ print_unknown_data(ndo, tptr+sizeof(struct ldp_msg_header), "\n\t ",
+ msg_len);
- tptr+=tlv_len;
- tlen-=tlv_len;
+ tptr += msg_len+4;
+ tlen -= msg_len+4;
}
- return;
+ return pdu_len+4;
trunc:
- printf("\n\t\t packet exceeded snapshot");
+ ND_PRINT((ndo, "\n\t\t packet exceeded snapshot"));
+ return 0;
}
+/*
+ * Local Variables:
+ * c-style: whitesmith
+ * c-basic-offset: 8
+ * End:
+ */
projects / tcpdump / blobdiff