/* * 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@juniper.net) */ #ifndef lint static const char rcsid[] _U_ = "@(#) $Header: /tcpdump/master/tcpdump/print-lspping.c,v 1.1 2004-06-06 19:20:03 hannes Exp $"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include "interface.h" #include "extract.h" #include "addrtoname.h" /* * LSPPING 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 Number | Must Be Zero | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Message Type | Reply mode | Return Code | Return Subcode| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Sender's Handle | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Sequence Number | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | TimeStamp Sent (seconds) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | TimeStamp Sent (microseconds) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | TimeStamp Received (seconds) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | TimeStamp Received (microseconds) | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | TLVs ... | * . . * . . * . . */ struct lspping_common_header { u_int8_t version[2]; u_int8_t reserved[2]; u_int8_t msg_type; u_int8_t reply_mode; u_int8_t return_code; u_int8_t return_subcode; u_int8_t sender_handle[4]; u_int8_t seq_number[4]; u_int8_t ts_sent_sec[4]; u_int8_t ts_sent_usec[4]; u_int8_t ts_rcvd_sec[4]; u_int8_t ts_rcvd_usec[4]; }; #define LSPPING_VERSION 1 #define FALSE 0 #define TRUE 1 static const struct tok lspping_msg_type_values[] = { { 1, "MPLS Echo Request"}, { 2, "MPLS Echo Reply"}, { 0, NULL} }; static const struct tok lspping_reply_mode_values[] = { { 1, "Do not reply"}, { 2, "Reply via an IPv4/IPv6 UDP packet"}, { 3, "Reply via an IPv4/IPv6 UDP packet with Router Alert"}, { 4, "Reply via application level control channel"}, { 0, NULL} }; /* * LSPPING 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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Type | Length | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Value | * . . * . . * . . * | | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ struct lspping_tlv_header { u_int8_t type[2]; u_int8_t length[2]; }; #define LSPPING_TLV_TARGET_FEC_STACK 1 #define LSPPING_TLV_DOWNSTREAM_MAPPING 2 #define LSPPING_TLV_PAD 3 #define LSPPING_TLV_ERROR_CODE 4 #define LSPPING_TLV_VENDOR_PRIVATE 5 static const struct tok lspping_tlv_values[] = { { LSPPING_TLV_TARGET_FEC_STACK, "Target FEC Stack" }, { LSPPING_TLV_DOWNSTREAM_MAPPING, "Downstream Mapping" }, { LSPPING_TLV_PAD, "Pad" }, { LSPPING_TLV_ERROR_CODE, "Error Code" }, { LSPPING_TLV_VENDOR_PRIVATE, "Vendor Enterprise Code" }, { 0, NULL} }; void lspping_print(register const u_char *pptr, register u_int len) { const struct lspping_common_header *lspping_com_header; const struct lspping_tlv_header *lspping_tlv_header; const u_char *tptr,*tlv_tptr; int tlen,lspping_tlv_len,lspping_tlv_type,tlv_tlen; int hexdump; tptr=pptr; lspping_com_header = (const struct lspping_common_header *)pptr; TCHECK(*lspping_com_header); /* * Sanity checking of the header. */ if (EXTRACT_16BITS(&lspping_com_header->version[0]) != LSPPING_VERSION) { printf("LSP-PING version %u packet not supported", EXTRACT_16BITS(&lspping_com_header->version[0])); return; } /* in non-verbose mode just lets print the basic Message Type*/ if (vflag < 1) { printf("LSP-PINGv%u, %s, seq %u, length: %u", EXTRACT_16BITS(&lspping_com_header->version[0]), tok2str(lspping_msg_type_values, "unknown (%u)",lspping_com_header->msg_type), EXTRACT_32BITS(lspping_com_header->seq_number), len); return; } /* ok they seem to want to know everything - lets fully decode it */ tlen=len; printf("\n\tLSP-PINGv%u, msg-type: %s (%u), reply-mode: %s (%u)" \ "\n\t Return Code: (%u), Return Subcode: (%u)" \ "\n\t Sender Handle: 0x%08x, Sequence: %u" \ "\n\t Sender Timestamp %u.%us, Receiver Timestamp %u.%us", EXTRACT_16BITS(&lspping_com_header->version[0]), tok2str(lspping_msg_type_values, "unknown",lspping_com_header->msg_type), lspping_com_header->msg_type, tok2str(lspping_reply_mode_values, "unknown",lspping_com_header->reply_mode), lspping_com_header->reply_mode, lspping_com_header->return_code, lspping_com_header->return_subcode, EXTRACT_32BITS(lspping_com_header->sender_handle), EXTRACT_32BITS(lspping_com_header->seq_number), EXTRACT_32BITS(lspping_com_header->ts_sent_sec), EXTRACT_32BITS(lspping_com_header->ts_sent_usec), EXTRACT_32BITS(lspping_com_header->ts_rcvd_sec), EXTRACT_32BITS(lspping_com_header->ts_rcvd_usec)); tptr+=sizeof(const struct lspping_common_header); tlen-=sizeof(const struct lspping_common_header); while(tlen>0) { /* did we capture enough for fully decoding the tlv header ? */ if (!TTEST2(*tptr, sizeof(struct lspping_tlv_header))) goto trunc; lspping_tlv_header = (const struct lspping_tlv_header *)tptr; lspping_tlv_type=EXTRACT_16BITS(lspping_tlv_header->type); lspping_tlv_len=EXTRACT_16BITS(lspping_tlv_header->length); if(lspping_tlv_len % 4 || lspping_tlv_len < 4) return; printf("\n\t %s TLV (%u), length: %u", tok2str(lspping_tlv_values, "Unknown", lspping_tlv_type), lspping_tlv_type, lspping_tlv_len); tlv_tptr=tptr+sizeof(struct lspping_tlv_header); tlv_tlen=lspping_tlv_len-sizeof(struct lspping_tlv_header); /* did we capture enough for fully decoding the tlv ? */ if (!TTEST2(*tptr, lspping_tlv_len)) goto trunc; hexdump=FALSE; switch(lspping_tlv_type) { /* * FIXME those are the defined messages that lack a decoder * you are welcome to contribute code ;-) */ case LSPPING_TLV_TARGET_FEC_STACK: case LSPPING_TLV_DOWNSTREAM_MAPPING: case LSPPING_TLV_PAD: case LSPPING_TLV_ERROR_CODE: case LSPPING_TLV_VENDOR_PRIVATE: default: if (vflag <= 1) print_unknown_data(tlv_tptr,"\n\t ",tlv_tlen); break; } /* do we want to see an additionally hexdump ? */ if (vflag > 1 || hexdump==TRUE) print_unknown_data(tptr+sizeof(sizeof(struct lspping_tlv_header)),"\n\t ", lspping_tlv_len-sizeof(struct lspping_tlv_header)); tptr+=lspping_tlv_len; tlen-=lspping_tlv_len; } return; trunc: printf("\n\t\t packet exceeded snapshot"); }