| /* |
| * Copyright (c) 1991, 1993, 1994, 1995, 1996, 1997 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * 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, (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, and (3) all advertising materials mentioning |
| * features or use of this software display the following acknowledgement: |
| * ``This product includes software developed by the University of California, |
| * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| * the University nor the names of its contributors may be used to endorse |
| * or promote products derived from this software without specific prior |
| * written permission. |
| * 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. |
| * |
| * L2TP support contributed by Motonori Shindo (mshindo@mshindo.net) |
| */ |
| |
| #ifndef lint |
| static const char rcsid[] _U_ = |
| "@(#) $Header: /tcpdump/master/tcpdump/print-l2tp.c,v 1.20 2006-06-23 02:03:09 hannes Exp $"; |
| #endif |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <tcpdump-stdinc.h> |
| |
| #include <stdio.h> |
| |
| #include "l2tp.h" |
| #include "interface.h" |
| #include "extract.h" |
| |
| static char tstr[] = " [|l2tp]"; |
| |
| #define L2TP_MSGTYPE_SCCRQ 1 /* Start-Control-Connection-Request */ |
| #define L2TP_MSGTYPE_SCCRP 2 /* Start-Control-Connection-Reply */ |
| #define L2TP_MSGTYPE_SCCCN 3 /* Start-Control-Connection-Connected */ |
| #define L2TP_MSGTYPE_STOPCCN 4 /* Stop-Control-Connection-Notification */ |
| #define L2TP_MSGTYPE_HELLO 6 /* Hello */ |
| #define L2TP_MSGTYPE_OCRQ 7 /* Outgoing-Call-Request */ |
| #define L2TP_MSGTYPE_OCRP 8 /* Outgoing-Call-Reply */ |
| #define L2TP_MSGTYPE_OCCN 9 /* Outgoing-Call-Connected */ |
| #define L2TP_MSGTYPE_ICRQ 10 /* Incoming-Call-Request */ |
| #define L2TP_MSGTYPE_ICRP 11 /* Incoming-Call-Reply */ |
| #define L2TP_MSGTYPE_ICCN 12 /* Incoming-Call-Connected */ |
| #define L2TP_MSGTYPE_CDN 14 /* Call-Disconnect-Notify */ |
| #define L2TP_MSGTYPE_WEN 15 /* WAN-Error-Notify */ |
| #define L2TP_MSGTYPE_SLI 16 /* Set-Link-Info */ |
| |
| static struct tok l2tp_msgtype2str[] = { |
| { L2TP_MSGTYPE_SCCRQ, "SCCRQ" }, |
| { L2TP_MSGTYPE_SCCRP, "SCCRP" }, |
| { L2TP_MSGTYPE_SCCCN, "SCCCN" }, |
| { L2TP_MSGTYPE_STOPCCN, "StopCCN" }, |
| { L2TP_MSGTYPE_HELLO, "HELLO" }, |
| { L2TP_MSGTYPE_OCRQ, "OCRQ" }, |
| { L2TP_MSGTYPE_OCRP, "OCRP" }, |
| { L2TP_MSGTYPE_OCCN, "OCCN" }, |
| { L2TP_MSGTYPE_ICRQ, "ICRQ" }, |
| { L2TP_MSGTYPE_ICRP, "ICRP" }, |
| { L2TP_MSGTYPE_ICCN, "ICCN" }, |
| { L2TP_MSGTYPE_CDN, "CDN" }, |
| { L2TP_MSGTYPE_WEN, "WEN" }, |
| { L2TP_MSGTYPE_SLI, "SLI" }, |
| { 0, NULL } |
| }; |
| |
| #define L2TP_AVP_MSGTYPE 0 /* Message Type */ |
| #define L2TP_AVP_RESULT_CODE 1 /* Result Code */ |
| #define L2TP_AVP_PROTO_VER 2 /* Protocol Version */ |
| #define L2TP_AVP_FRAMING_CAP 3 /* Framing Capabilities */ |
| #define L2TP_AVP_BEARER_CAP 4 /* Bearer Capabilities */ |
| #define L2TP_AVP_TIE_BREAKER 5 /* Tie Breaker */ |
| #define L2TP_AVP_FIRM_VER 6 /* Firmware Revision */ |
| #define L2TP_AVP_HOST_NAME 7 /* Host Name */ |
| #define L2TP_AVP_VENDOR_NAME 8 /* Vendor Name */ |
| #define L2TP_AVP_ASSND_TUN_ID 9 /* Assigned Tunnel ID */ |
| #define L2TP_AVP_RECV_WIN_SIZE 10 /* Receive Window Size */ |
| #define L2TP_AVP_CHALLENGE 11 /* Challenge */ |
| #define L2TP_AVP_Q931_CC 12 /* Q.931 Cause Code */ |
| #define L2TP_AVP_CHALLENGE_RESP 13 /* Challenge Response */ |
| #define L2TP_AVP_ASSND_SESS_ID 14 /* Assigned Session ID */ |
| #define L2TP_AVP_CALL_SER_NUM 15 /* Call Serial Number */ |
| #define L2TP_AVP_MINIMUM_BPS 16 /* Minimum BPS */ |
| #define L2TP_AVP_MAXIMUM_BPS 17 /* Maximum BPS */ |
| #define L2TP_AVP_BEARER_TYPE 18 /* Bearer Type */ |
| #define L2TP_AVP_FRAMING_TYPE 19 /* Framing Type */ |
| #define L2TP_AVP_PACKET_PROC_DELAY 20 /* Packet Processing Delay (OBSOLETE) */ |
| #define L2TP_AVP_CALLED_NUMBER 21 /* Called Number */ |
| #define L2TP_AVP_CALLING_NUMBER 22 /* Calling Number */ |
| #define L2TP_AVP_SUB_ADDRESS 23 /* Sub-Address */ |
| #define L2TP_AVP_TX_CONN_SPEED 24 /* (Tx) Connect Speed */ |
| #define L2TP_AVP_PHY_CHANNEL_ID 25 /* Physical Channel ID */ |
| #define L2TP_AVP_INI_RECV_LCP 26 /* Initial Received LCP CONFREQ */ |
| #define L2TP_AVP_LAST_SENT_LCP 27 /* Last Sent LCP CONFREQ */ |
| #define L2TP_AVP_LAST_RECV_LCP 28 /* Last Received LCP CONFREQ */ |
| #define L2TP_AVP_PROXY_AUTH_TYPE 29 /* Proxy Authen Type */ |
| #define L2TP_AVP_PROXY_AUTH_NAME 30 /* Proxy Authen Name */ |
| #define L2TP_AVP_PROXY_AUTH_CHAL 31 /* Proxy Authen Challenge */ |
| #define L2TP_AVP_PROXY_AUTH_ID 32 /* Proxy Authen ID */ |
| #define L2TP_AVP_PROXY_AUTH_RESP 33 /* Proxy Authen Response */ |
| #define L2TP_AVP_CALL_ERRORS 34 /* Call Errors */ |
| #define L2TP_AVP_ACCM 35 /* ACCM */ |
| #define L2TP_AVP_RANDOM_VECTOR 36 /* Random Vector */ |
| #define L2TP_AVP_PRIVATE_GRP_ID 37 /* Private Group ID */ |
| #define L2TP_AVP_RX_CONN_SPEED 38 /* (Rx) Connect Speed */ |
| #define L2TP_AVP_SEQ_REQUIRED 39 /* Sequencing Required */ |
| #define L2TP_AVP_PPP_DISCON_CC 46 /* PPP Disconnect Cause Code */ |
| |
| static struct tok l2tp_avp2str[] = { |
| { L2TP_AVP_MSGTYPE, "MSGTYPE" }, |
| { L2TP_AVP_RESULT_CODE, "RESULT_CODE" }, |
| { L2TP_AVP_PROTO_VER, "PROTO_VER" }, |
| { L2TP_AVP_FRAMING_CAP, "FRAMING_CAP" }, |
| { L2TP_AVP_BEARER_CAP, "BEARER_CAP" }, |
| { L2TP_AVP_TIE_BREAKER, "TIE_BREAKER" }, |
| { L2TP_AVP_FIRM_VER, "FIRM_VER" }, |
| { L2TP_AVP_HOST_NAME, "HOST_NAME" }, |
| { L2TP_AVP_VENDOR_NAME, "VENDOR_NAME" }, |
| { L2TP_AVP_ASSND_TUN_ID, "ASSND_TUN_ID" }, |
| { L2TP_AVP_RECV_WIN_SIZE, "RECV_WIN_SIZE" }, |
| { L2TP_AVP_CHALLENGE, "CHALLENGE" }, |
| { L2TP_AVP_Q931_CC, "Q931_CC", }, |
| { L2TP_AVP_CHALLENGE_RESP, "CHALLENGE_RESP" }, |
| { L2TP_AVP_ASSND_SESS_ID, "ASSND_SESS_ID" }, |
| { L2TP_AVP_CALL_SER_NUM, "CALL_SER_NUM" }, |
| { L2TP_AVP_MINIMUM_BPS, "MINIMUM_BPS" }, |
| { L2TP_AVP_MAXIMUM_BPS, "MAXIMUM_BPS" }, |
| { L2TP_AVP_BEARER_TYPE, "BEARER_TYPE" }, |
| { L2TP_AVP_FRAMING_TYPE, "FRAMING_TYPE" }, |
| { L2TP_AVP_PACKET_PROC_DELAY, "PACKET_PROC_DELAY" }, |
| { L2TP_AVP_CALLED_NUMBER, "CALLED_NUMBER" }, |
| { L2TP_AVP_CALLING_NUMBER, "CALLING_NUMBER" }, |
| { L2TP_AVP_SUB_ADDRESS, "SUB_ADDRESS" }, |
| { L2TP_AVP_TX_CONN_SPEED, "TX_CONN_SPEED" }, |
| { L2TP_AVP_PHY_CHANNEL_ID, "PHY_CHANNEL_ID" }, |
| { L2TP_AVP_INI_RECV_LCP, "INI_RECV_LCP" }, |
| { L2TP_AVP_LAST_SENT_LCP, "LAST_SENT_LCP" }, |
| { L2TP_AVP_LAST_RECV_LCP, "LAST_RECV_LCP" }, |
| { L2TP_AVP_PROXY_AUTH_TYPE, "PROXY_AUTH_TYPE" }, |
| { L2TP_AVP_PROXY_AUTH_NAME, "PROXY_AUTH_NAME" }, |
| { L2TP_AVP_PROXY_AUTH_CHAL, "PROXY_AUTH_CHAL" }, |
| { L2TP_AVP_PROXY_AUTH_ID, "PROXY_AUTH_ID" }, |
| { L2TP_AVP_PROXY_AUTH_RESP, "PROXY_AUTH_RESP" }, |
| { L2TP_AVP_CALL_ERRORS, "CALL_ERRORS" }, |
| { L2TP_AVP_ACCM, "ACCM" }, |
| { L2TP_AVP_RANDOM_VECTOR, "RANDOM_VECTOR" }, |
| { L2TP_AVP_PRIVATE_GRP_ID, "PRIVATE_GRP_ID" }, |
| { L2TP_AVP_RX_CONN_SPEED, "RX_CONN_SPEED" }, |
| { L2TP_AVP_SEQ_REQUIRED, "SEQ_REQUIRED" }, |
| { L2TP_AVP_PPP_DISCON_CC, "PPP_DISCON_CC" }, |
| { 0, NULL } |
| }; |
| |
| static struct tok l2tp_authentype2str[] = { |
| { L2TP_AUTHEN_TYPE_RESERVED, "Reserved" }, |
| { L2TP_AUTHEN_TYPE_TEXTUAL, "Textual" }, |
| { L2TP_AUTHEN_TYPE_CHAP, "CHAP" }, |
| { L2TP_AUTHEN_TYPE_PAP, "PAP" }, |
| { L2TP_AUTHEN_TYPE_NO_AUTH, "No Auth" }, |
| { L2TP_AUTHEN_TYPE_MSCHAPv1, "MS-CHAPv1" }, |
| { 0, NULL } |
| }; |
| |
| #define L2TP_PPP_DISCON_CC_DIRECTION_GLOBAL 0 |
| #define L2TP_PPP_DISCON_CC_DIRECTION_AT_PEER 1 |
| #define L2TP_PPP_DISCON_CC_DIRECTION_AT_LOCAL 2 |
| |
| static struct tok l2tp_cc_direction2str[] = { |
| { L2TP_PPP_DISCON_CC_DIRECTION_GLOBAL, "global error" }, |
| { L2TP_PPP_DISCON_CC_DIRECTION_AT_PEER, "at peer" }, |
| { L2TP_PPP_DISCON_CC_DIRECTION_AT_LOCAL,"at local" }, |
| { 0, NULL } |
| }; |
| |
| #if 0 |
| static char *l2tp_result_code_StopCCN[] = { |
| "Reserved", |
| "General request to clear control connection", |
| "General error--Error Code indicates the problem", |
| "Control channel already exists", |
| "Requester is not authorized to establish a control channel", |
| "The protocol version of the requester is not supported", |
| "Requester is being shut down", |
| "Finite State Machine error" |
| #define L2TP_MAX_RESULT_CODE_STOPCC_INDEX 8 |
| }; |
| #endif |
| |
| #if 0 |
| static char *l2tp_result_code_CDN[] = { |
| "Reserved", |
| "Call disconnected due to loss of carrier", |
| "Call disconnected for the reason indicated in error code", |
| "Call disconnected for administrative reasons", |
| "Call failed due to lack of appropriate facilities being " \ |
| "available (temporary condition)", |
| "Call failed due to lack of appropriate facilities being " \ |
| "available (permanent condition)", |
| "Invalid destination", |
| "Call failed due to no carrier detected", |
| "Call failed due to detection of a busy signal", |
| "Call failed due to lack of a dial tone", |
| "Call was not established within time allotted by LAC", |
| "Call was connected but no appropriate framing was detected" |
| #define L2TP_MAX_RESULT_CODE_CDN_INDEX 12 |
| }; |
| #endif |
| |
| #if 0 |
| static char *l2tp_error_code_general[] = { |
| "No general error", |
| "No control connection exists yet for this LAC-LNS pair", |
| "Length is wrong", |
| "One of the field values was out of range or " \ |
| "reserved field was non-zero" |
| "Insufficient resources to handle this operation now", |
| "The Session ID is invalid in this context", |
| "A generic vendor-specific error occurred in the LAC", |
| "Try another" |
| #define L2TP_MAX_ERROR_CODE_GENERAL_INDEX 8 |
| }; |
| #endif |
| |
| /******************************/ |
| /* generic print out routines */ |
| /******************************/ |
| static void |
| print_string(const u_char *dat, u_int length) |
| { |
| u_int i; |
| for (i=0; i<length; i++) { |
| printf("%c", *dat++); |
| } |
| } |
| |
| static void |
| print_octets(const u_char *dat, u_int length) |
| { |
| u_int i; |
| for (i=0; i<length; i++) { |
| printf("%02x", *dat++); |
| } |
| } |
| |
| static void |
| print_16bits_val(const u_int16_t *dat) |
| { |
| printf("%u", EXTRACT_16BITS(dat)); |
| } |
| |
| static void |
| print_32bits_val(const u_int32_t *dat) |
| { |
| printf("%lu", (u_long)EXTRACT_32BITS(dat)); |
| } |
| |
| /***********************************/ |
| /* AVP-specific print out routines */ |
| /***********************************/ |
| static void |
| l2tp_msgtype_print(const u_char *dat) |
| { |
| u_int16_t *ptr = (u_int16_t*)dat; |
| |
| printf("%s", tok2str(l2tp_msgtype2str, "MSGTYPE-#%u", |
| EXTRACT_16BITS(ptr))); |
| } |
| |
| static void |
| l2tp_result_code_print(const u_char *dat, u_int length) |
| { |
| u_int16_t *ptr = (u_int16_t *)dat; |
| |
| printf("%u", EXTRACT_16BITS(ptr)); ptr++; /* Result Code */ |
| if (length > 2) { /* Error Code (opt) */ |
| printf("/%u", EXTRACT_16BITS(ptr)); ptr++; |
| } |
| if (length > 4) { /* Error Message (opt) */ |
| printf(" "); |
| print_string((u_char *)ptr, length - 4); |
| } |
| } |
| |
| static void |
| l2tp_proto_ver_print(const u_int16_t *dat) |
| { |
| printf("%u.%u", (EXTRACT_16BITS(dat) >> 8), |
| (EXTRACT_16BITS(dat) & 0xff)); |
| } |
| |
| static void |
| l2tp_framing_cap_print(const u_char *dat) |
| { |
| u_int32_t *ptr = (u_int32_t *)dat; |
| |
| if (EXTRACT_32BITS(ptr) & L2TP_FRAMING_CAP_ASYNC_MASK) { |
| printf("A"); |
| } |
| if (EXTRACT_32BITS(ptr) & L2TP_FRAMING_CAP_SYNC_MASK) { |
| printf("S"); |
| } |
| } |
| |
| static void |
| l2tp_bearer_cap_print(const u_char *dat) |
| { |
| u_int32_t *ptr = (u_int32_t *)dat; |
| |
| if (EXTRACT_32BITS(ptr) & L2TP_BEARER_CAP_ANALOG_MASK) { |
| printf("A"); |
| } |
| if (EXTRACT_32BITS(ptr) & L2TP_BEARER_CAP_DIGITAL_MASK) { |
| printf("D"); |
| } |
| } |
| |
| static void |
| l2tp_q931_cc_print(const u_char *dat, u_int length) |
| { |
| print_16bits_val((u_int16_t *)dat); |
| printf(", %02x", dat[2]); |
| if (length > 3) { |
| printf(" "); |
| print_string(dat+3, length-3); |
| } |
| } |
| |
| static void |
| l2tp_bearer_type_print(const u_char *dat) |
| { |
| u_int32_t *ptr = (u_int32_t *)dat; |
| |
| if (EXTRACT_32BITS(ptr) & L2TP_BEARER_TYPE_ANALOG_MASK) { |
| printf("A"); |
| } |
| if (EXTRACT_32BITS(ptr) & L2TP_BEARER_TYPE_DIGITAL_MASK) { |
| printf("D"); |
| } |
| } |
| |
| static void |
| l2tp_framing_type_print(const u_char *dat) |
| { |
| u_int32_t *ptr = (u_int32_t *)dat; |
| |
| if (EXTRACT_32BITS(ptr) & L2TP_FRAMING_TYPE_ASYNC_MASK) { |
| printf("A"); |
| } |
| if (EXTRACT_32BITS(ptr) & L2TP_FRAMING_TYPE_SYNC_MASK) { |
| printf("S"); |
| } |
| } |
| |
| static void |
| l2tp_packet_proc_delay_print(void) |
| { |
| printf("obsolete"); |
| } |
| |
| static void |
| l2tp_proxy_auth_type_print(const u_char *dat) |
| { |
| u_int16_t *ptr = (u_int16_t *)dat; |
| |
| printf("%s", tok2str(l2tp_authentype2str, |
| "AuthType-#%u", EXTRACT_16BITS(ptr))); |
| } |
| |
| static void |
| l2tp_proxy_auth_id_print(const u_char *dat) |
| { |
| u_int16_t *ptr = (u_int16_t *)dat; |
| |
| printf("%u", EXTRACT_16BITS(ptr) & L2TP_PROXY_AUTH_ID_MASK); |
| } |
| |
| static void |
| l2tp_call_errors_print(const u_char *dat) |
| { |
| u_int16_t *ptr = (u_int16_t *)dat; |
| u_int16_t val_h, val_l; |
| |
| ptr++; /* skip "Reserved" */ |
| |
| val_h = EXTRACT_16BITS(ptr); ptr++; |
| val_l = EXTRACT_16BITS(ptr); ptr++; |
| printf("CRCErr=%u ", (val_h<<16) + val_l); |
| |
| val_h = EXTRACT_16BITS(ptr); ptr++; |
| val_l = EXTRACT_16BITS(ptr); ptr++; |
| printf("FrameErr=%u ", (val_h<<16) + val_l); |
| |
| val_h = EXTRACT_16BITS(ptr); ptr++; |
| val_l = EXTRACT_16BITS(ptr); ptr++; |
| printf("HardOver=%u ", (val_h<<16) + val_l); |
| |
| val_h = EXTRACT_16BITS(ptr); ptr++; |
| val_l = EXTRACT_16BITS(ptr); ptr++; |
| printf("BufOver=%u ", (val_h<<16) + val_l); |
| |
| val_h = EXTRACT_16BITS(ptr); ptr++; |
| val_l = EXTRACT_16BITS(ptr); ptr++; |
| printf("Timeout=%u ", (val_h<<16) + val_l); |
| |
| val_h = EXTRACT_16BITS(ptr); ptr++; |
| val_l = EXTRACT_16BITS(ptr); ptr++; |
| printf("AlignErr=%u ", (val_h<<16) + val_l); |
| } |
| |
| static void |
| l2tp_accm_print(const u_char *dat) |
| { |
| u_int16_t *ptr = (u_int16_t *)dat; |
| u_int16_t val_h, val_l; |
| |
| ptr++; /* skip "Reserved" */ |
| |
| val_h = EXTRACT_16BITS(ptr); ptr++; |
| val_l = EXTRACT_16BITS(ptr); ptr++; |
| printf("send=%08x ", (val_h<<16) + val_l); |
| |
| val_h = EXTRACT_16BITS(ptr); ptr++; |
| val_l = EXTRACT_16BITS(ptr); ptr++; |
| printf("recv=%08x ", (val_h<<16) + val_l); |
| } |
| |
| static void |
| l2tp_ppp_discon_cc_print(const u_char *dat, u_int length) |
| { |
| u_int16_t *ptr = (u_int16_t *)dat; |
| |
| printf("%04x, ", EXTRACT_16BITS(ptr)); ptr++; /* Disconnect Code */ |
| printf("%04x ", EXTRACT_16BITS(ptr)); ptr++; /* Control Protocol Number */ |
| printf("%s", tok2str(l2tp_cc_direction2str, |
| "Direction-#%u", *((u_char *)ptr++))); |
| |
| if (length > 5) { |
| printf(" "); |
| print_string((const u_char *)ptr, length-5); |
| } |
| } |
| |
| static void |
| l2tp_avp_print(const u_char *dat, int length) |
| { |
| u_int len; |
| const u_int16_t *ptr = (u_int16_t *)dat; |
| u_int16_t attr_type; |
| int hidden = FALSE; |
| |
| if (length <= 0) { |
| return; |
| } |
| |
| printf(" "); |
| |
| TCHECK(*ptr); /* Flags & Length */ |
| len = EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_LEN_MASK; |
| |
| /* If it is not long enough to contain the header, we'll give up. */ |
| if (len < 6) |
| goto trunc; |
| |
| /* If it goes past the end of the remaining length of the packet, |
| we'll give up. */ |
| if (len > (u_int)length) |
| goto trunc; |
| |
| /* If it goes past the end of the remaining length of the captured |
| data, we'll give up. */ |
| TCHECK2(*ptr, len); |
| /* After this point, no need to worry about truncation */ |
| |
| if (EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_FLAG_MANDATORY) { |
| printf("*"); |
| } |
| if (EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_FLAG_HIDDEN) { |
| hidden = TRUE; |
| printf("?"); |
| } |
| ptr++; |
| |
| if (EXTRACT_16BITS(ptr)) { |
| /* Vendor Specific Attribute */ |
| printf("VENDOR%04x:", EXTRACT_16BITS(ptr)); ptr++; |
| printf("ATTR%04x", EXTRACT_16BITS(ptr)); ptr++; |
| printf("("); |
| print_octets((u_char *)ptr, len-6); |
| printf(")"); |
| } else { |
| /* IETF-defined Attributes */ |
| ptr++; |
| attr_type = EXTRACT_16BITS(ptr); ptr++; |
| printf("%s", tok2str(l2tp_avp2str, "AVP-#%u", attr_type)); |
| printf("("); |
| if (hidden) { |
| printf("???"); |
| } else { |
| switch (attr_type) { |
| case L2TP_AVP_MSGTYPE: |
| l2tp_msgtype_print((u_char *)ptr); |
| break; |
| case L2TP_AVP_RESULT_CODE: |
| l2tp_result_code_print((u_char *)ptr, len-6); |
| break; |
| case L2TP_AVP_PROTO_VER: |
| l2tp_proto_ver_print(ptr); |
| break; |
| case L2TP_AVP_FRAMING_CAP: |
| l2tp_framing_cap_print((u_char *)ptr); |
| break; |
| case L2TP_AVP_BEARER_CAP: |
| l2tp_bearer_cap_print((u_char *)ptr); |
| break; |
| case L2TP_AVP_TIE_BREAKER: |
| print_octets((u_char *)ptr, 8); |
| break; |
| case L2TP_AVP_FIRM_VER: |
| case L2TP_AVP_ASSND_TUN_ID: |
| case L2TP_AVP_RECV_WIN_SIZE: |
| case L2TP_AVP_ASSND_SESS_ID: |
| print_16bits_val(ptr); |
| break; |
| case L2TP_AVP_HOST_NAME: |
| case L2TP_AVP_VENDOR_NAME: |
| case L2TP_AVP_CALLING_NUMBER: |
| case L2TP_AVP_CALLED_NUMBER: |
| case L2TP_AVP_SUB_ADDRESS: |
| case L2TP_AVP_PROXY_AUTH_NAME: |
| case L2TP_AVP_PRIVATE_GRP_ID: |
| print_string((u_char *)ptr, len-6); |
| break; |
| case L2TP_AVP_CHALLENGE: |
| case L2TP_AVP_INI_RECV_LCP: |
| case L2TP_AVP_LAST_SENT_LCP: |
| case L2TP_AVP_LAST_RECV_LCP: |
| case L2TP_AVP_PROXY_AUTH_CHAL: |
| case L2TP_AVP_PROXY_AUTH_RESP: |
| case L2TP_AVP_RANDOM_VECTOR: |
| print_octets((u_char *)ptr, len-6); |
| break; |
| case L2TP_AVP_Q931_CC: |
| l2tp_q931_cc_print((u_char *)ptr, len-6); |
| break; |
| case L2TP_AVP_CHALLENGE_RESP: |
| print_octets((u_char *)ptr, 16); |
| break; |
| case L2TP_AVP_CALL_SER_NUM: |
| case L2TP_AVP_MINIMUM_BPS: |
| case L2TP_AVP_MAXIMUM_BPS: |
| case L2TP_AVP_TX_CONN_SPEED: |
| case L2TP_AVP_PHY_CHANNEL_ID: |
| case L2TP_AVP_RX_CONN_SPEED: |
| print_32bits_val((u_int32_t *)ptr); |
| break; |
| case L2TP_AVP_BEARER_TYPE: |
| l2tp_bearer_type_print((u_char *)ptr); |
| break; |
| case L2TP_AVP_FRAMING_TYPE: |
| l2tp_framing_type_print((u_char *)ptr); |
| break; |
| case L2TP_AVP_PACKET_PROC_DELAY: |
| l2tp_packet_proc_delay_print(); |
| break; |
| case L2TP_AVP_PROXY_AUTH_TYPE: |
| l2tp_proxy_auth_type_print((u_char *)ptr); |
| break; |
| case L2TP_AVP_PROXY_AUTH_ID: |
| l2tp_proxy_auth_id_print((u_char *)ptr); |
| break; |
| case L2TP_AVP_CALL_ERRORS: |
| l2tp_call_errors_print((u_char *)ptr); |
| break; |
| case L2TP_AVP_ACCM: |
| l2tp_accm_print((u_char *)ptr); |
| break; |
| case L2TP_AVP_SEQ_REQUIRED: |
| break; /* No Attribute Value */ |
| case L2TP_AVP_PPP_DISCON_CC: |
| l2tp_ppp_discon_cc_print((u_char *)ptr, len-6); |
| break; |
| default: |
| break; |
| } |
| } |
| printf(")"); |
| } |
| |
| l2tp_avp_print(dat+len, length-len); |
| return; |
| |
| trunc: |
| printf("|..."); |
| } |
| |
| |
| void |
| l2tp_print(const u_char *dat, u_int length) |
| { |
| const u_char *ptr = dat; |
| u_int cnt = 0; /* total octets consumed */ |
| u_int16_t pad; |
| int flag_t, flag_l, flag_s, flag_o; |
| u_int16_t l2tp_len; |
| |
| flag_t = flag_l = flag_s = flag_o = FALSE; |
| |
| TCHECK2(*ptr, 2); /* Flags & Version */ |
| if ((EXTRACT_16BITS(ptr) & L2TP_VERSION_MASK) == L2TP_VERSION_L2TP) { |
| printf(" l2tp:"); |
| } else if ((EXTRACT_16BITS(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 (EXTRACT_16BITS(ptr) & L2TP_FLAG_TYPE) { |
| flag_t = TRUE; |
| printf("T"); |
| } |
| if (EXTRACT_16BITS(ptr) & L2TP_FLAG_LENGTH) { |
| flag_l = TRUE; |
| printf("L"); |
| } |
| if (EXTRACT_16BITS(ptr) & L2TP_FLAG_SEQUENCE) { |
| flag_s = TRUE; |
| printf("S"); |
| } |
| if (EXTRACT_16BITS(ptr) & L2TP_FLAG_OFFSET) { |
| flag_o = TRUE; |
| printf("O"); |
| } |
| if (EXTRACT_16BITS(ptr) & L2TP_FLAG_PRIORITY) |
| printf("P"); |
| printf("]"); |
| |
| ptr += 2; |
| cnt += 2; |
| |
| if (flag_l) { |
| TCHECK2(*ptr, 2); /* Length */ |
| l2tp_len = EXTRACT_16BITS(ptr); |
| ptr += 2; |
| cnt += 2; |
| } else { |
| l2tp_len = 0; |
| } |
| |
| TCHECK2(*ptr, 2); /* Tunnel ID */ |
| printf("(%u/", EXTRACT_16BITS(ptr)); |
| ptr += 2; |
| cnt += 2; |
| TCHECK2(*ptr, 2); /* Session ID */ |
| printf("%u)", EXTRACT_16BITS(ptr)); |
| ptr += 2; |
| cnt += 2; |
| |
| if (flag_s) { |
| TCHECK2(*ptr, 2); /* Ns */ |
| printf("Ns=%u,", EXTRACT_16BITS(ptr)); |
| ptr += 2; |
| cnt += 2; |
| TCHECK2(*ptr, 2); /* Nr */ |
| printf("Nr=%u", EXTRACT_16BITS(ptr)); |
| ptr += 2; |
| cnt += 2; |
| } |
| |
| if (flag_o) { |
| TCHECK2(*ptr, 2); /* Offset Size */ |
| pad = EXTRACT_16BITS(ptr); |
| ptr += (2 + pad); |
| cnt += (2 + pad); |
| } |
| |
| if (flag_l) { |
| if (length < l2tp_len) { |
| printf(" Length %u larger than packet", l2tp_len); |
| return; |
| } |
| length = l2tp_len; |
| } |
| if (length < cnt) { |
| printf(" Length %u smaller than header length", length); |
| return; |
| } |
| if (flag_t) { |
| if (!flag_l) { |
| printf(" No length"); |
| return; |
| } |
| if (length - cnt == 0) { |
| printf(" ZLB"); |
| } else { |
| l2tp_avp_print(ptr, length - cnt); |
| } |
| } else { |
| printf(" {"); |
| ppp_print(ptr, length - cnt); |
| printf("}"); |
| } |
| |
| return; |
| |
| trunc: |
| printf("%s", tstr); |
| } |