720 lines
19 KiB
C
720 lines
19 KiB
C
/*
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* Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* L2TP support contributed by Motonori Shindo (mshindo@mshindo.net)
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-l2tp.c,v 1.8 2000/08/18 07:44:46 itojun Exp $";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include "l2tp.h"
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#include "interface.h"
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static char tstr[] = " [|l2tp]";
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#ifndef TRUE
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#define TRUE 1
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#endif
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#ifndef FALSE
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#define FALSE 0
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#endif
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static char *l2tp_message_type_string[] = {
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"RESERVED_0", /* 0 Reserved */
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"SCCRQ", /* 1 Start-Control-Connection-Request */
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"SCCRP", /* 2 Start-Control-Connection-Reply */
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"SCCCN", /* 3 Start-Control-Connection-Connected */
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"StopCCN", /* 4 Stop-Control-Connection-Notification */
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"RESERVED_5", /* 5 Reserved */
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"HELLO", /* 6 Hello */
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"OCRQ", /* 7 Outgoing-Call-Request */
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"OCRP", /* 8 Outgoing-Call-Reply */
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"OCCN", /* 9 Outgoing-Call-Connected */
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"ICRQ", /* 10 Incoming-Call-Request */
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"ICRP", /* 11 Incoming-Call-Reply */
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"ICCN", /* 12 Incoming-Call-Connected */
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"RESERVED_13", /* 13 Reserved */
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"CDN", /* 14 Call-Disconnect-Notify */
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"WEN", /* 15 WAN-Error-Notify */
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"SLI" /* 16 Set-Link-Info */
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#define L2TP_MAX_MSGTYPE_INDEX 17
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};
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static void l2tp_msgtype_print(const u_char *dat, u_int length);
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static void l2tp_result_code_print(const u_char *dat, u_int length);
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static void l2tp_proto_ver_print(const u_char *dat, u_int length);
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static void l2tp_framing_cap_print(const u_char *dat, u_int length);
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static void l2tp_bearer_cap_print(const u_char *dat, u_int length);
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static void l2tp_tie_breaker_print(const u_char *dat, u_int length);
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static void l2tp_firm_ver_print(const u_char *dat, u_int length);
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static void l2tp_host_name_print(const u_char *dat, u_int length);
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static void l2tp_vendor_name_print(const u_char *dat, u_int length);
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static void l2tp_assnd_tun_id_print(const u_char *dat, u_int length);
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static void l2tp_recv_win_size_print(const u_char *dat, u_int length);
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static void l2tp_challenge_print(const u_char *dat, u_int length);
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static void l2tp_q931_cc_print(const u_char *dat, u_int length);
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static void l2tp_challenge_resp_print(const u_char *dat, u_int length);
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static void l2tp_assnd_sess_id_print(const u_char *dat, u_int length);
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static void l2tp_call_ser_num_print(const u_char *dat, u_int length);
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static void l2tp_minimum_bps_print(const u_char *dat, u_int length);
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static void l2tp_maximum_bps_print(const u_char *dat, u_int length);
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static void l2tp_bearer_type_print(const u_char *dat, u_int length);
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static void l2tp_framing_type_print(const u_char *dat, u_int length);
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static void l2tp_packet_proc_delay_print(const u_char *dat, u_int length);
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static void l2tp_called_number_print(const u_char *dat, u_int length);
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static void l2tp_calling_number_print(const u_char *dat, u_int length);
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static void l2tp_sub_address_print(const u_char *dat, u_int length);
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static void l2tp_tx_conn_speed_print(const u_char *dat, u_int length);
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static void l2tp_phy_channel_id_print(const u_char *dat, u_int length);
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static void l2tp_ini_recv_lcp_print(const u_char *dat, u_int length);
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static void l2tp_last_sent_lcp_print(const u_char *dat, u_int length);
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static void l2tp_last_recv_lcp_print(const u_char *dat, u_int length);
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static void l2tp_proxy_auth_type_print(const u_char *dat, u_int length);
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static void l2tp_proxy_auth_name_print(const u_char *dat, u_int length);
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static void l2tp_proxy_auth_chal_print(const u_char *dat, u_int length);
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static void l2tp_proxy_auth_id_print(const u_char *dat, u_int length);
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static void l2tp_proxy_auth_resp_print(const u_char *dat, u_int length);
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static void l2tp_call_errors_print(const u_char *dat, u_int length);
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static void l2tp_accm_print(const u_char *dat, u_int length);
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static void l2tp_random_vector_print(const u_char *dat, u_int length);
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static void l2tp_private_grp_id_print(const u_char *dat, u_int length);
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static void l2tp_rx_conn_speed_print(const u_char *dat, u_int length);
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static void l2tp_seq_required_print(const u_char *dat, u_int length);
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static void l2tp_avp_print(const u_char *dat, u_int length);
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static struct l2tp_avp_vec l2tp_avp[] = {
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{"MSGTYPE", l2tp_msgtype_print}, /* 0 Message Type */
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{"RESULT_CODE", l2tp_result_code_print}, /* 1 Result Code */
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{"PROTO_VER", l2tp_proto_ver_print}, /* 2 Protocol Version */
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{"FRAMING_CAP", l2tp_framing_cap_print}, /* 3 Framing Capabilities */
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{"BEARER_CAP", l2tp_bearer_cap_print}, /* 4 Bearer Capabilities */
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{"TIE_BREAKER", l2tp_tie_breaker_print}, /* 5 Tie Breaker */
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{"FIRM_VER", l2tp_firm_ver_print}, /* 6 Firmware Revision */
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{"HOST_NAME", l2tp_host_name_print}, /* 7 Host Name */
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{"VENDOR_NAME", l2tp_vendor_name_print}, /* 8 Vendor Name */
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{"ASSND_TUN_ID", l2tp_assnd_tun_id_print}, /* 9 Assigned Tunnel ID */
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{"RECV_WIN_SIZE", l2tp_recv_win_size_print}, /* 10 Receive Window Size */
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{"CHALLENGE", l2tp_challenge_print}, /* 11 Challenge */
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{"Q931_CC", l2tp_q931_cc_print}, /* 12 Q.931 Cause Code */
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{"CHALLENGE_RESP", l2tp_challenge_resp_print},/* 13 Challenge Response */
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{"ASSND_SESS_ID", l2tp_assnd_sess_id_print}, /* 14 Assigned Session ID */
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{"CALL_SER_NUM", l2tp_call_ser_num_print}, /* 15 Call Serial Number */
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{"MINIMUM_BPS", l2tp_minimum_bps_print},/* 16 Minimum BPS */
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{"MAXIMUM_BPS", l2tp_maximum_bps_print}, /* 17 Maximum BPS */
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{"BEARER_TYPE", l2tp_bearer_type_print},/* 18 Bearer Type */
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{"FRAMING_TYPE", l2tp_framing_type_print}, /* 19 Framing Type */
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{"PACKET_PROC_DELAY", l2tp_packet_proc_delay_print}, /* 20 Packet Processing Delay (OBSOLETE) */
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{"CALLED_NUMBER", l2tp_called_number_print}, /* 21 Called Number */
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{"CALLING_NUMBER", l2tp_calling_number_print},/* 22 Calling Number */
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{"SUB_ADDRESS", l2tp_sub_address_print},/* 23 Sub-Address */
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{"TX_CONN_SPEED", l2tp_tx_conn_speed_print}, /* 24 (Tx) Connect Speed */
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{"PHY_CHANNEL_ID", l2tp_phy_channel_id_print},/* 25 Physical Channel ID */
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{"INI_RECV_LCP", l2tp_ini_recv_lcp_print}, /* 26 Initial Received LCP CONFREQ */
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{"LAST_SENT_LCP", l2tp_last_sent_lcp_print}, /* 27 Last Sent LCP CONFREQ */
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{"LAST_RECV_LCP", l2tp_last_recv_lcp_print}, /* 28 Last Received LCP CONFREQ */
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{"PROXY_AUTH_TYPE", l2tp_proxy_auth_type_print},/* 29 Proxy Authen Type */
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{"PROXY_AUTH_NAME", l2tp_proxy_auth_name_print},/* 30 Proxy Authen Name */
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{"PROXY_AUTH_CHAL", l2tp_proxy_auth_chal_print},/* 31 Proxy Authen Challenge */
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{"PROXY_AUTH_ID", l2tp_proxy_auth_id_print}, /* 32 Proxy Authen ID */
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{"PROXY_AUTH_RESP", l2tp_proxy_auth_resp_print},/* 33 Proxy Authen Response */
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{"CALL_ERRORS", l2tp_call_errors_print}, /* 34 Call Errors */
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{"ACCM", l2tp_accm_print}, /* 35 ACCM */
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{"RANDOM_VECTOR", l2tp_random_vector_print}, /* 36 Random Vector */
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{"PRIVATE_GRP_ID", l2tp_private_grp_id_print},/* 37 Private Group ID */
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{"RX_CONN_SPEED", l2tp_rx_conn_speed_print}, /* 38 (Rx) Connect Speed */
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{"SEQ_REQUIRED", l2tp_seq_required_print}, /* 39 Sequencing Required */
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#define L2TP_MAX_AVP_INDEX 40
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};
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#if 0
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static char *l2tp_result_code_StopCCN[] = {
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"Reserved",
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"General request to clear control connection",
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"General error--Error Code indicates the problem",
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"Control channel already exists",
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"Requester is not authorized to establish a control channel",
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"The protocol version of the requester is not supported",
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"Requester is being shut down",
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"Finite State Machine error"
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#define L2TP_MAX_RESULT_CODE_STOPCC_INDEX 8
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};
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#endif
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#if 0
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static char *l2tp_result_code_CDN[] = {
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"Reserved",
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"Call disconnected due to loss of carrier",
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"Call disconnected for the reason indicated in error code",
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"Call disconnected for administrative reasons",
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"Call failed due to lack of appropriate facilities being " \
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"available (temporary condition)",
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"Call failed due to lack of appropriate facilities being " \
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"available (permanent condition)",
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"Invalid destination",
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"Call failed due to no carrier detected",
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"Call failed due to detection of a busy signal",
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"Call failed due to lack of a dial tone",
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"Call was not established within time allotted by LAC",
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"Call was connected but no appropriate framing was detected"
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#define L2TP_MAX_RESULT_CODE_CDN_INDEX 12
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};
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#endif
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#if 0
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static char *l2tp_error_code_general[] = {
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"No general error",
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"No control connection exists yet for this LAC-LNS pair",
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"Length is wrong",
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"One of the field values was out of range or " \
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"reserved field was non-zero"
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"Insufficient resources to handle this operation now",
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"The Session ID is invalid in this context",
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"A generic vendor-specific error occurred in the LAC",
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"Try another"
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#define L2TP_MAX_ERROR_CODE_GENERAL_INDEX 8
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};
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#endif
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/******************************/
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/* generic print out routines */
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/******************************/
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static void
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print_string(const u_char *dat, u_int length)
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{
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int i;
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for (i=0; i<length; i++) {
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printf("%c", *dat++);
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}
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}
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static void
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print_octets(const u_char *dat, u_int length)
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{
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int i;
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for (i=0; i<length; i++) {
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printf("%02x", *dat++);
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}
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}
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static void
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print_short(const u_short *dat)
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{
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printf("%u", ntohs(*dat));
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}
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static void
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print_int(const u_int *dat)
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{
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printf("%lu", (u_long)ntohl(*dat));
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}
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/**********************************/
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/* AVP-specific print out routines*/
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/**********************************/
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static void
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l2tp_msgtype_print(const u_char *dat, u_int length)
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{
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u_short *ptr = (u_short *)dat;
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if (ntohs(*ptr) < L2TP_MAX_MSGTYPE_INDEX) {
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printf("%s", l2tp_message_type_string[ntohs(*ptr)]);
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}
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}
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static void
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l2tp_result_code_print(const u_char *dat, u_int length)
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{
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/* we just print out the result and error code number */
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u_short *ptr = (u_short *)dat;
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if (length == 2) { /* result code */
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printf("%u", ntohs(*ptr));
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} else if (length == 4) { /* result & error code */
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printf("%u/%u", ntohs(*ptr), ntohs(*(ptr+1)));
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} else if (length > 4) { /* result & error code & msg */
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printf("%u/%u ", ntohs(*ptr), ntohs(*(ptr+1)));
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print_string((u_char *)(ptr+2), length - 4);
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}
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}
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static void
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l2tp_proto_ver_print(const u_char *dat, u_int length)
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{
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printf("%d.%d", *dat, *(dat+1));
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}
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static void
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l2tp_framing_cap_print(const u_char *dat, u_int length)
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{
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u_int *ptr = (u_int *)dat;
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if (ntohl(*ptr) & L2TP_FRAMING_CAP_ASYNC_MASK) {
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printf("A");
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}
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if (ntohl(*ptr) & L2TP_FRAMING_CAP_SYNC_MASK) {
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printf("S");
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}
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}
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static void
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l2tp_bearer_cap_print(const u_char *dat, u_int length)
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{
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u_int *ptr = (u_int *)dat;
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if (ntohl(*ptr) & L2TP_BEARER_CAP_ANALOG_MASK) {
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printf("A");
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}
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if (ntohl(*ptr) & L2TP_BEARER_CAP_DIGITAL_MASK) {
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printf("D");
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}
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}
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static void
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l2tp_tie_breaker_print(const u_char *dat, u_int length)
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{
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print_octets(dat, 8); /* Tie Break Value is 64bits long */
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}
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static void
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l2tp_firm_ver_print(const u_char *dat, u_int length)
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{
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print_short((u_short *)dat);
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}
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static void
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l2tp_host_name_print(const u_char *dat, u_int length)
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{
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print_string(dat, length);
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}
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static void
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l2tp_vendor_name_print(const u_char *dat, u_int length)
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{
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print_string(dat, length);
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}
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static void
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l2tp_assnd_tun_id_print(const u_char *dat, u_int length)
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{
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print_short((u_short *)dat);
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}
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static void
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l2tp_recv_win_size_print(const u_char *dat, u_int length)
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{
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print_short((u_short *)dat);
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}
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static void
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l2tp_challenge_print(const u_char *dat, u_int length)
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{
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print_octets(dat, length);
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}
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static void
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l2tp_q931_cc_print(const u_char *dat, u_int length)
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{
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print_short((u_short *)dat);
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printf(", %02x", dat[2]);
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if (length > 3) {
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printf(" ");
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print_string(dat+3, length-3);
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}
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}
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static void
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l2tp_challenge_resp_print(const u_char *dat, u_int length)
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{
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print_octets(dat, 16); /* XXX length should be 16? */
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}
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static void
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l2tp_assnd_sess_id_print(const u_char *dat, u_int length)
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{
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print_short((u_short *)dat);
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}
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static void
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l2tp_call_ser_num_print(const u_char *dat, u_int length)
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{
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print_int((u_int *)dat);
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}
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static void
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l2tp_minimum_bps_print(const u_char *dat, u_int length)
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{
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print_int((u_int *)dat);
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}
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static void
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l2tp_maximum_bps_print(const u_char *dat, u_int length)
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{
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print_int((u_int *)dat);
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}
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static void
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l2tp_bearer_type_print(const u_char *dat, u_int length)
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{
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u_int *ptr = (u_int *)dat;
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if (ntohl(*ptr) & L2TP_BEARER_TYPE_ANALOG_MASK) {
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printf("A");
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}
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if (ntohl(*ptr) & L2TP_BEARER_TYPE_DIGITAL_MASK) {
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printf("D");
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}
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}
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static void
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l2tp_framing_type_print(const u_char *dat, u_int length)
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{
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u_int *ptr = (u_int *)dat;
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if (ntohl(*ptr) & L2TP_FRAMING_TYPE_ASYNC_MASK) {
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printf("A");
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}
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if (ntohl(*ptr) & L2TP_FRAMING_TYPE_SYNC_MASK) {
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printf("S");
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}
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}
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static void
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l2tp_packet_proc_delay_print(const u_char *dat, u_int length)
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{
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printf("obsolete");
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}
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static void
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l2tp_called_number_print(const u_char *dat, u_int length)
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{
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print_string(dat, length);
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}
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static void
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l2tp_calling_number_print(const u_char *dat, u_int length)
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{
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print_string(dat, length);
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}
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static void
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l2tp_sub_address_print(const u_char *dat, u_int length)
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{
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print_string(dat, length);
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}
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static void
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l2tp_tx_conn_speed_print(const u_char *dat, u_int length)
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{
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print_int((u_int *)dat);
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}
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static void
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l2tp_phy_channel_id_print(const u_char *dat, u_int length)
|
|
{
|
|
print_int((u_int *)dat);
|
|
}
|
|
|
|
static void
|
|
l2tp_ini_recv_lcp_print(const u_char *dat, u_int length)
|
|
{
|
|
print_octets(dat, length);
|
|
}
|
|
|
|
static void
|
|
l2tp_last_sent_lcp_print(const u_char *dat, u_int length)
|
|
{
|
|
print_octets(dat, length);
|
|
}
|
|
|
|
static void
|
|
l2tp_last_recv_lcp_print(const u_char *dat, u_int length)
|
|
{
|
|
print_octets(dat, length);
|
|
}
|
|
|
|
static void
|
|
l2tp_proxy_auth_type_print(const u_char *dat, u_int length)
|
|
{
|
|
u_short *ptr = (u_short *)dat;
|
|
|
|
switch (ntohs(*ptr)) {
|
|
case L2TP_AUTHEN_TYPE_RESERVED:
|
|
printf("Reserved");
|
|
break;
|
|
case L2TP_AUTHEN_TYPE_TEXTUAL:
|
|
printf("Textual");
|
|
break;
|
|
case L2TP_AUTHEN_TYPE_CHAP:
|
|
printf("CHAP");
|
|
break;
|
|
case L2TP_AUTHEN_TYPE_PAP:
|
|
printf("PAP");
|
|
break;
|
|
case L2TP_AUTHEN_TYPE_NO_AUTH:
|
|
printf("No Auth");
|
|
break;
|
|
case L2TP_AUTHEN_TYPE_MSCHAP:
|
|
printf("MS-CHAP");
|
|
break;
|
|
default:
|
|
printf("unknown");
|
|
}
|
|
}
|
|
|
|
static void
|
|
l2tp_proxy_auth_name_print(const u_char *dat, u_int length)
|
|
{
|
|
print_octets(dat, length);
|
|
}
|
|
|
|
static void
|
|
l2tp_proxy_auth_chal_print(const u_char *dat, u_int length)
|
|
{
|
|
print_octets(dat, length);
|
|
}
|
|
|
|
static void
|
|
l2tp_proxy_auth_id_print(const u_char *dat, u_int length)
|
|
{
|
|
u_short *ptr = (u_short *)dat;
|
|
|
|
printf("%u", ntohs(*ptr) & L2TP_PROXY_AUTH_ID_MASK);
|
|
}
|
|
|
|
static void
|
|
l2tp_proxy_auth_resp_print(const u_char *dat, u_int length)
|
|
{
|
|
print_octets(dat, length);
|
|
}
|
|
|
|
static void
|
|
l2tp_call_errors_print(const u_char *dat, u_int length)
|
|
{
|
|
struct l2tp_call_errors *ptr = (struct l2tp_call_errors *)dat;
|
|
|
|
printf("CRCErr=%d FrameErr=%d HardOver=%d BufOver=%d ",
|
|
ptr->crc_errs,
|
|
ptr->framing_errs,
|
|
ptr->hardware_overruns,
|
|
ptr->buffer_overruns);
|
|
printf("Timeout=%d AlingErr=%d",
|
|
ptr->timeout_errs,
|
|
ptr->alignment_errs);
|
|
}
|
|
|
|
static void
|
|
l2tp_accm_print(const u_char *dat, u_int length)
|
|
{
|
|
struct l2tp_accm *ptr = (struct l2tp_accm *)dat;
|
|
|
|
printf("send=%x recv=%x", ptr->send_accm, ptr->recv_accm);
|
|
}
|
|
|
|
static void
|
|
l2tp_random_vector_print(const u_char *dat, u_int length)
|
|
{
|
|
print_octets(dat, length);
|
|
}
|
|
|
|
static void
|
|
l2tp_private_grp_id_print(const u_char *dat, u_int length)
|
|
{
|
|
print_string(dat, length);
|
|
/* XXX print_octets is more appropriate?? */
|
|
}
|
|
|
|
static void
|
|
l2tp_rx_conn_speed_print(const u_char *dat, u_int length)
|
|
{
|
|
print_int((u_int *)dat);
|
|
}
|
|
|
|
static void
|
|
l2tp_seq_required_print(const u_char *dat, u_int length)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static void
|
|
l2tp_avp_print(const u_char *dat, u_int length)
|
|
{
|
|
u_int len;
|
|
const u_short *ptr = (u_short *)dat;
|
|
int hidden = FALSE;
|
|
|
|
printf(" ");
|
|
if (length > 0 && (snapend - dat) >= 2) {
|
|
/* there must be at least two octets for the length
|
|
to be decoded */
|
|
if ((len = (ntohs(*ptr) & L2TP_AVP_HDR_LEN_MASK)) <=
|
|
(snapend - dat)) {
|
|
if (ntohs(*ptr) & L2TP_AVP_HDR_FLAG_MANDATORY) {
|
|
printf("*");
|
|
}
|
|
if (ntohs(*ptr) & L2TP_AVP_HDR_FLAG_HIDDEN) {
|
|
hidden = TRUE;
|
|
printf("?");
|
|
}
|
|
} else {
|
|
printf("|...");
|
|
return;
|
|
}
|
|
ptr++;
|
|
|
|
if (ntohs(*ptr)) {
|
|
/* Vendor Specific Attribute */
|
|
printf("VENDOR%04x:", ntohs(*ptr));
|
|
ptr++;
|
|
printf("ATTR%04x", ntohs(*ptr));
|
|
printf("(");
|
|
print_octets((u_char *)ptr+2, len-6);
|
|
printf(")");
|
|
} else {
|
|
/* IETF-defined Attribute */
|
|
ptr++;
|
|
if (ntohs(*ptr) < L2TP_MAX_AVP_INDEX) {
|
|
printf("%s", l2tp_avp[ntohs(*ptr)].name);
|
|
printf("(");
|
|
if (!hidden) {
|
|
(l2tp_avp[ntohs(*ptr)].print)
|
|
((u_char *)ptr+2, len-6);
|
|
} else {
|
|
printf("???");
|
|
}
|
|
printf(")");
|
|
} else {
|
|
printf(" invalid AVP %u", ntohs(*ptr));
|
|
}
|
|
}
|
|
|
|
l2tp_avp_print(dat + len, length - len);
|
|
} else if (length == 0) {
|
|
return;
|
|
} else {
|
|
printf("|...");
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
l2tp_print(const u_char *dat, u_int length)
|
|
{
|
|
const u_short *ptr = (u_short *)dat;
|
|
u_int cnt = 0; /* total octets consumed */
|
|
u_short pad;
|
|
int flag_t, flag_l, flag_s, flag_o, flag_p;
|
|
u_short l2tp_len;
|
|
|
|
flag_t = flag_l = flag_s = flag_o = flag_p = FALSE;
|
|
|
|
if (min(length, snapend - dat) - 6 < 0) {
|
|
/* flag/ver, tunnel_id, session_id must be present for
|
|
this packet to be properly decoded */
|
|
printf("%s", tstr);
|
|
return;
|
|
}
|
|
|
|
if ((ntohs(*ptr) & L2TP_VERSION_MASK) == L2TP_VERSION_L2TP) {
|
|
printf(" l2tp:");
|
|
} else if ((ntohs(*ptr) & L2TP_VERSION_MASK) == L2TP_VERSION_L2F) {
|
|
printf(" l2f:");
|
|
return; /* nothing to do */
|
|
} else {
|
|
printf(" Unknown Version, neither L2F(1) nor L2TP(2)");
|
|
return; /* nothing we can do */
|
|
}
|
|
|
|
printf("[");
|
|
if (ntohs(*ptr) & L2TP_FLAG_TYPE) {
|
|
flag_t = TRUE;
|
|
printf("T");
|
|
}
|
|
if (ntohs(*ptr) & L2TP_FLAG_LENGTH) {
|
|
flag_l = TRUE;
|
|
printf("L");
|
|
}
|
|
if (ntohs(*ptr) & L2TP_FLAG_SEQUENCE) {
|
|
flag_s = TRUE;
|
|
printf("S");
|
|
}
|
|
if (ntohs(*ptr) & L2TP_FLAG_OFFSET) {
|
|
flag_o = TRUE;
|
|
printf("O");
|
|
}
|
|
if (ntohs(*ptr) & L2TP_FLAG_PRIORITY) {
|
|
flag_p = TRUE;
|
|
printf("P");
|
|
}
|
|
printf("]");
|
|
|
|
ptr++;
|
|
cnt += 2;
|
|
|
|
if (flag_l) {
|
|
l2tp_len = ntohs(*ptr++); /* XXX need to consider
|
|
truncation ?? */
|
|
cnt += 2;
|
|
} else {
|
|
l2tp_len = 0;
|
|
}
|
|
|
|
printf("(%u/", ntohs(*ptr++)); /* Tunnel ID */
|
|
printf("%u)", ntohs(*ptr++)); /* Session ID */
|
|
cnt += 4;
|
|
|
|
if (flag_s) {
|
|
printf("Ns=%u,", ntohs(*ptr++));
|
|
printf("Nr=%u", ntohs(*ptr++));
|
|
cnt += 4;
|
|
}
|
|
|
|
if (flag_o) {
|
|
pad = ntohs(*ptr++);
|
|
ptr += pad / sizeof(*ptr);
|
|
cnt += (2 + pad);
|
|
}
|
|
|
|
if (flag_t) {
|
|
if (length - cnt == 0) {
|
|
printf(" ZLB");
|
|
} else {
|
|
l2tp_avp_print((u_char *)ptr, length - cnt);
|
|
}
|
|
} else {
|
|
printf(" {");
|
|
ppp_print((u_char *)ptr, length - cnt);
|
|
printf("}");
|
|
}
|
|
}
|