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-rw-r--r--print-ldp.c700
1 files changed, 700 insertions, 0 deletions
diff --git a/print-ldp.c b/print-ldp.c
new file mode 100644
index 0000000..896bc40
--- /dev/null
+++ b/print-ldp.c
@@ -0,0 +1,700 @@
+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code
+ * distributions retain the above copyright notice and this paragraph
+ * in its entirety, and (2) distributions including binary code include
+ * the above copyright notice and this paragraph in its entirety in
+ * the documentation or other materials provided with the distribution.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
+ * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
+ * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE.
+ *
+ * Original code by Hannes Gredler (hannes@gredler.at)
+ * and Steinar Haug (sthaug@nethelp.no)
+ */
+
+/* \summary: Label Distribution Protocol (LDP) printer */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#include "netdissect.h"
+#include "extract.h"
+#include "addrtoname.h"
+
+#include "l2vpn.h"
+#include "af.h"
+
+
+/*
+ * ldp common 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
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Version | PDU Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | LDP Identifier |
+ * + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ */
+
+struct ldp_common_header {
+ nd_uint16_t version;
+ nd_uint16_t pdu_length;
+ nd_ipv4 lsr_id;
+ nd_uint16_t label_space;
+};
+
+#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 {
+ nd_uint16_t type;
+ nd_uint16_t length;
+ nd_uint32_t id;
+};
+
+#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 u_int ldp_pdu_print(netdissect_options *, const u_char *);
+
+/*
+ * ldp tlv 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|F| Type | Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | |
+ * | Value |
+ * ~ ~
+ * | |
+ * | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+#define TLV_TCHECK(minlen) \
+ if (tlv_tlen < minlen) { \
+ ND_PRINT(" [tlv length %u < %u]", tlv_tlen, minlen); \
+ nd_print_invalid(ndo); \
+ goto invalid; \
+ }
+
+static u_int
+ldp_tlv_print(netdissect_options *ndo,
+ const u_char *tptr,
+ u_int msg_tlen)
+{
+ struct ldp_tlv_header {
+ nd_uint16_t type;
+ nd_uint16_t length;
+ };
+
+ 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_SIZE(ldp_tlv_header);
+ tlv_len=GET_BE_U_2(ldp_tlv_header->length);
+ if (tlv_len + 4U > msg_tlen) {
+ ND_PRINT("\n\t\t TLV contents go past end of message");
+ return 0;
+ }
+ tlv_tlen=tlv_len;
+ tlv_type=LDP_MASK_TLV_TYPE(GET_BE_U_2(ldp_tlv_header->type));
+
+ /* FIXME vendor private / experimental check */
+ ND_PRINT("\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(GET_BE_U_2(ldp_tlv_header->type)) ? "continue processing" : "ignore",
+ LDP_MASK_F_BIT(GET_BE_U_2(ldp_tlv_header->type)) ? "do" : "don't");
+
+ tptr+=sizeof(struct ldp_tlv_header);
+
+ switch(tlv_type) {
+
+ case LDP_TLV_COMMON_HELLO:
+ TLV_TCHECK(4);
+ ND_PRINT("\n\t Hold Time: %us, Flags: [%s Hello%s]",
+ GET_BE_U_2(tptr),
+ (GET_BE_U_2(tptr + 2)&0x8000) ? "Targeted" : "Link",
+ (GET_BE_U_2(tptr + 2)&0x4000) ? ", Request for targeted Hellos" : "");
+ break;
+
+ case LDP_TLV_IPV4_TRANSPORT_ADDR:
+ TLV_TCHECK(4);
+ ND_PRINT("\n\t IPv4 Transport Address: %s", GET_IPADDR_STRING(tptr));
+ break;
+ case LDP_TLV_IPV6_TRANSPORT_ADDR:
+ TLV_TCHECK(16);
+ ND_PRINT("\n\t IPv6 Transport Address: %s", GET_IP6ADDR_STRING(tptr));
+ break;
+ case LDP_TLV_CONFIG_SEQ_NUMBER:
+ TLV_TCHECK(4);
+ ND_PRINT("\n\t Sequence Number: %u", GET_BE_U_4(tptr));
+ break;
+
+ case LDP_TLV_ADDRESS_LIST:
+ TLV_TCHECK(LDP_TLV_ADDRESS_LIST_AFNUM_LEN);
+ af = GET_BE_U_2(tptr);
+ tptr+=LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
+ tlv_tlen -= LDP_TLV_ADDRESS_LIST_AFNUM_LEN;
+ ND_PRINT("\n\t Address Family: %s, addresses",
+ tok2str(af_values, "Unknown (%u)", af));
+ switch (af) {
+ case AFNUM_INET:
+ while(tlv_tlen >= sizeof(nd_ipv4)) {
+ ND_PRINT(" %s", GET_IPADDR_STRING(tptr));
+ tlv_tlen-=sizeof(nd_ipv4);
+ tptr+=sizeof(nd_ipv4);
+ }
+ break;
+ case AFNUM_INET6:
+ while(tlv_tlen >= sizeof(nd_ipv6)) {
+ ND_PRINT(" %s", GET_IP6ADDR_STRING(tptr));
+ tlv_tlen-=sizeof(nd_ipv6);
+ tptr+=sizeof(nd_ipv6);
+ }
+ break;
+ default:
+ /* unknown AF */
+ break;
+ }
+ break;
+
+ case LDP_TLV_COMMON_SESSION:
+ TLV_TCHECK(8);
+ ND_PRINT("\n\t Version: %u, Keepalive: %us, Flags: [Downstream %s, Loop Detection %s]",
+ GET_BE_U_2(tptr), GET_BE_U_2(tptr + 2),
+ (GET_BE_U_2(tptr + 6)&0x8000) ? "On Demand" : "Unsolicited",
+ (GET_BE_U_2(tptr + 6)&0x4000) ? "Enabled" : "Disabled"
+ );
+ break;
+
+ case LDP_TLV_FEC:
+ TLV_TCHECK(1);
+ fec_type = GET_U_1(tptr);
+ ND_PRINT("\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 = GET_BE_U_2(tptr);
+ tptr+=2;
+ tlv_tlen-=2;
+ if (af == AFNUM_INET) {
+ i=decode_prefix4(ndo, tptr, tlv_tlen, buf, sizeof(buf));
+ if (i == -2)
+ goto trunc;
+ if (i == -3)
+ ND_PRINT(": IPv4 prefix (goes past end of TLV)");
+ else if (i == -1)
+ ND_PRINT(": IPv4 prefix (invalid length)");
+ else
+ ND_PRINT(": IPv4 prefix %s", buf);
+ }
+ 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(": IPv4 prefix (goes past end of TLV)");
+ else if (i == -1)
+ ND_PRINT(": IPv6 prefix (invalid length)");
+ else
+ ND_PRINT(": IPv6 prefix %s", buf);
+ }
+ else
+ ND_PRINT(": Address family %u prefix", af);
+ break;
+ case LDP_FEC_HOSTADDRESS:
+ break;
+ case LDP_FEC_MARTINI_VC:
+ /*
+ * We assume the type was supposed to be one of the MPLS
+ * Pseudowire Types.
+ */
+ TLV_TCHECK(7);
+ vc_info_len = GET_U_1(tptr + 2);
+
+ /*
+ * 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.
+ */
+ if (vc_info_len == 0) {
+ ND_PRINT(": %s, %scontrol word, group-ID %u, VC-info-length: %u",
+ tok2str(mpls_pw_types_values, "Unknown", GET_BE_U_2(tptr)&0x7fff),
+ GET_BE_U_2(tptr)&0x8000 ? "" : "no ",
+ GET_BE_U_4(tptr + 3),
+ vc_info_len);
+ break;
+ }
+
+ /* Make sure we have the VC ID as well */
+ TLV_TCHECK(11);
+ ND_PRINT(": %s, %scontrol word, group-ID %u, VC-ID %u, VC-info-length: %u",
+ tok2str(mpls_pw_types_values, "Unknown", GET_BE_U_2(tptr)&0x7fff),
+ GET_BE_U_2(tptr)&0x8000 ? "" : "no ",
+ GET_BE_U_4(tptr + 3),
+ GET_BE_U_4(tptr + 7),
+ vc_info_len);
+ if (vc_info_len < 4) {
+ /* minimum 4, for the VC ID */
+ ND_PRINT(" (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 = GET_U_1(tptr);
+ vc_info_tlv_len = GET_U_1(tptr + 1);
+ if (vc_info_tlv_len < 2)
+ break;
+ if (vc_info_len < vc_info_tlv_len)
+ break;
+
+ ND_PRINT("\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(": %u", GET_BE_U_2(tptr + 2));
+ break;
+
+ case LDP_FEC_MARTINI_IFPARM_DESC:
+ ND_PRINT(": ");
+ for (idx = 2; idx < vc_info_tlv_len; idx++)
+ fn_print_char(ndo, GET_U_1(tptr + idx));
+ break;
+
+ case LDP_FEC_MARTINI_IFPARM_VCCV:
+ ND_PRINT("\n\t\t Control Channels (0x%02x) = [%s]",
+ GET_U_1((tptr + 2)),
+ bittok2str(ldp_fec_martini_ifparm_vccv_cc_values, "none", GET_U_1((tptr + 2))));
+ ND_PRINT("\n\t\t CV Types (0x%02x) = [%s]",
+ GET_U_1((tptr + 3)),
+ bittok2str(ldp_fec_martini_ifparm_vccv_cv_values, "none", GET_U_1((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("\n\t Label: %u", GET_BE_U_4(tptr) & 0xfffff);
+ break;
+
+ case LDP_TLV_STATUS:
+ TLV_TCHECK(8);
+ ui = GET_BE_U_4(tptr);
+ tptr+=4;
+ ND_PRINT("\n\t Status: 0x%02x, Flags: [%s and %s forward]",
+ ui&0x3fffffff,
+ ui&0x80000000 ? "Fatal error" : "Advisory Notification",
+ ui&0x40000000 ? "do" : "don't");
+ ui = GET_BE_U_4(tptr);
+ tptr+=4;
+ if (ui)
+ ND_PRINT(", causing Message ID: 0x%08x", ui);
+ break;
+
+ case LDP_TLV_FT_SESSION:
+ TLV_TCHECK(12);
+ ft_flags = GET_BE_U_2(tptr);
+ ND_PRINT("\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 ");
+ /* 16 bits (FT Flags) + 16 bits (Reserved) */
+ tptr+=4;
+ ui = GET_BE_U_4(tptr);
+ if (ui)
+ ND_PRINT(", Reconnect Timeout: %ums", ui);
+ tptr+=4;
+ ui = GET_BE_U_4(tptr);
+ if (ui)
+ ND_PRINT(", Recovery Time: %ums", ui);
+ break;
+
+ case LDP_TLV_MTU:
+ TLV_TCHECK(2);
+ ND_PRINT("\n\t MTU: %u", GET_BE_U_2(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_trunc_longjmp(ndo);
+
+invalid:
+ return(tlv_len+4); /* Type & Length fields not included */
+}
+
+void
+ldp_print(netdissect_options *ndo,
+ const u_char *pptr, u_int len)
+{
+ u_int processed;
+
+ ndo->ndo_protocol = "ldp";
+ while (len > (sizeof(struct ldp_common_header) + sizeof(struct ldp_msg_header))) {
+ processed = ldp_pdu_print(ndo, pptr);
+ if (processed == 0)
+ return;
+ if (len < processed) {
+ ND_PRINT(" [remaining length %u < %u]", len, processed);
+ nd_print_invalid(ndo);
+ break;
+ }
+ len -= processed;
+ pptr += processed;
+ }
+}
+
+static u_int
+ldp_pdu_print(netdissect_options *ndo,
+ const u_char *pptr)
+{
+ const struct ldp_common_header *ldp_com_header;
+ 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;
+ u_int msg_tlen;
+ int hexdump,processed;
+
+ ldp_com_header = (const struct ldp_common_header *)pptr;
+ ND_TCHECK_SIZE(ldp_com_header);
+
+ /*
+ * Sanity checking of the header.
+ */
+ if (GET_BE_U_2(ldp_com_header->version) != LDP_VERSION) {
+ ND_PRINT("%sLDP version %u packet not supported",
+ (ndo->ndo_vflag < 1) ? "" : "\n\t",
+ GET_BE_U_2(ldp_com_header->version));
+ return 0;
+ }
+
+ pdu_len = GET_BE_U_2(ldp_com_header->pdu_length);
+ if (pdu_len < sizeof(struct ldp_common_header)-4) {
+ /* length too short */
+ ND_PRINT("%sLDP, pdu-length: %u (too short, < %zu)",
+ (ndo->ndo_vflag < 1) ? "" : "\n\t",
+ pdu_len,
+ sizeof(struct ldp_common_header)-4);
+ return 0;
+ }
+
+ /* print the LSR-ID, label-space & length */
+ ND_PRINT("%sLDP, Label-Space-ID: %s:%u, pdu-length: %u",
+ (ndo->ndo_vflag < 1) ? "" : "\n\t",
+ GET_IPADDR_STRING(ldp_com_header->lsr_id),
+ GET_BE_U_2(ldp_com_header->label_space),
+ pdu_len);
+
+ /* bail out if non-verbose */
+ if (ndo->ndo_vflag < 1)
+ return 0;
+
+ /* ok they seem to want to know everything - lets fully decode it */
+ tptr = pptr + sizeof(struct ldp_common_header);
+ tlen = pdu_len - (sizeof(struct ldp_common_header)-4); /* Type & Length fields not included */
+
+ while(tlen>0) {
+ /* did we capture enough for fully decoding the msg header ? */
+ ND_TCHECK_LEN(tptr, sizeof(struct ldp_msg_header));
+
+ ldp_msg_header = (const struct ldp_msg_header *)tptr;
+ msg_len=GET_BE_U_2(ldp_msg_header->length);
+ msg_type=LDP_MASK_MSG_TYPE(GET_BE_U_2(ldp_msg_header->type));
+
+ if (msg_len < sizeof(struct ldp_msg_header)-4) {
+ /* length too short */
+ /* FIXME vendor private / experimental check */
+ ND_PRINT("\n\t %s Message (0x%04x), length: %u (too short, < %zu)",
+ tok2str(ldp_msg_values,
+ "Unknown",
+ msg_type),
+ msg_type,
+ msg_len,
+ sizeof(struct ldp_msg_header)-4);
+ return 0;
+ }
+
+ /* FIXME vendor private / experimental check */
+ ND_PRINT("\n\t %s Message (0x%04x), length: %u, Message ID: 0x%08x, Flags: [%s if unknown]",
+ tok2str(ldp_msg_values,
+ "Unknown",
+ msg_type),
+ msg_type,
+ msg_len,
+ GET_BE_U_4(ldp_msg_header->id),
+ LDP_MASK_U_BIT(GET_BE_U_2(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_TCHECK_LEN(tptr, msg_len);
+ hexdump=FALSE;
+
+ 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 messages that lack a decoder
+ * you are welcome to contribute code ;-)
+ */
+
+ case LDP_MSG_LABEL_REQUEST:
+ case LDP_MSG_LABEL_RELEASE:
+ case LDP_MSG_LABEL_ABORT_REQUEST:
+
+ default:
+ 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 (ndo->ndo_vflag > 1 || hexdump==TRUE)
+ print_unknown_data(ndo, tptr+sizeof(struct ldp_msg_header), "\n\t ",
+ msg_len);
+
+ tptr += msg_len+4;
+ tlen -= msg_len+4;
+ }
+ return pdu_len+4;
+trunc:
+ nd_trunc_longjmp(ndo);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 20:21:11 +0000