diff options
Diffstat (limited to 'contrib/tcpdump/print-l2tp.c')
| -rw-r--r-- | contrib/tcpdump/print-l2tp.c | 714 |
1 files changed, 714 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-l2tp.c b/contrib/tcpdump/print-l2tp.c new file mode 100644 index 0000000..55c21251 --- /dev/null +++ b/contrib/tcpdump/print-l2tp.c @@ -0,0 +1,714 @@ +/* + * 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_int16_t *ptr = (u_int16_t *)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; + + TCHECK(*ptr); /* 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++; + cnt += 2; + + if (flag_l) { + TCHECK(*ptr); /* Length */ + l2tp_len = EXTRACT_16BITS(ptr); ptr++; + cnt += 2; + } else { + l2tp_len = 0; + } + + TCHECK(*ptr); /* Tunnel ID */ + printf("(%u/", EXTRACT_16BITS(ptr)); ptr++; + cnt += 2; + TCHECK(*ptr); /* Session ID */ + printf("%u)", EXTRACT_16BITS(ptr)); ptr++; + cnt += 2; + + if (flag_s) { + TCHECK(*ptr); /* Ns */ + printf("Ns=%u,", EXTRACT_16BITS(ptr)); ptr++; + cnt += 2; + TCHECK(*ptr); /* Nr */ + printf("Nr=%u", EXTRACT_16BITS(ptr)); ptr++; + cnt += 2; + } + + if (flag_o) { + TCHECK(*ptr); /* Offset Size */ + pad = EXTRACT_16BITS(ptr); ptr++; + ptr += pad / sizeof(*ptr); + 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((u_char *)ptr, length - cnt); + } + } else { + printf(" {"); + ppp_print((u_char *)ptr, length - cnt); + printf("}"); + } + + return; + + trunc: + printf("%s", tstr); +} |
