OpenBSD-4.6/usr.sbin/tcpdump/print-l2tp.c
/* $OpenBSD: print-l2tp.c,v 1.3 2007/10/07 16:41:05 deraadt Exp $ */
/*
* 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@ascend.co.jp)
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Id: print-l2tp.c,v 1.3 2007/10/07 16:41:05 deraadt Exp $";
#endif
#include <sys/types.h>
#include <sys/param.h>
#include <stdio.h>
#include "l2tp.h"
#include "interface.h"
static char tstr[] = " [|l2tp]";
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
static u_char *l2tp_message_type_string[] = {
"RESERVED_0", /* 0 Reserved */
"SCCRQ", /* 1 Start-Control-Connection-Request */
"SCCRP", /* 2 Start-Control-Connection-Reply */
"SCCCN", /* 3 Start-Control-Connection-Connected */
"StopCCN", /* 4 Stop-Control-Connection-Notification */
"RESERVED_5", /* 5 Reserved */
"HELLO", /* 6 Hello */
"OCRQ", /* 7 Outgoing-Call-Request */
"OCRP", /* 8 Outgoing-Call-Reply */
"OCCN", /* 9 Outgoing-Call-Connected */
"ICRQ", /* 10 Incoming-Call-Request */
"ICRP", /* 11 Incoming-Call-Reply */
"ICCN", /* 12 Incoming-Call-Connected */
"RESERVED_13", /* 13 Reserved */
"CDN", /* 14 Call-Disconnect-Notify */
"WEN", /* 15 WAN-Error-Notify */
"SLI" /* 16 Set-Link-Info */
#define L2TP_MAX_MSGTYPE_INDEX 17
};
static void l2tp_msgtype_print(const u_char *dat, u_int length);
static void l2tp_result_code_print(const u_char *dat, u_int length);
static void l2tp_proto_ver_print(const u_char *dat, u_int length);
static void l2tp_framing_cap_print(const u_char *dat, u_int length);
static void l2tp_bearer_cap_print(const u_char *dat, u_int length);
static void l2tp_tie_breaker_print(const u_char *dat, u_int length);
static void l2tp_firm_ver_print(const u_char *dat, u_int length);
static void l2tp_host_name_print(const u_char *dat, u_int length);
static void l2tp_vendor_name_print(const u_char *dat, u_int length);
static void l2tp_assnd_tun_id_print(const u_char *dat, u_int length);
static void l2tp_recv_win_size_print(const u_char *dat, u_int length);
static void l2tp_challenge_print(const u_char *dat, u_int length);
static void l2tp_q931_cc_print(const u_char *dat, u_int length);
static void l2tp_challenge_resp_print(const u_char *dat, u_int length);
static void l2tp_assnd_sess_id_print(const u_char *dat, u_int length);
static void l2tp_call_ser_num_print(const u_char *dat, u_int length);
static void l2tp_minimum_bps_print(const u_char *dat, u_int length);
static void l2tp_maximum_bps_print(const u_char *dat, u_int length);
static void l2tp_bearer_type_print(const u_char *dat, u_int length);
static void l2tp_framing_type_print(const u_char *dat, u_int length);
static void l2tp_packet_proc_delay_print(const u_char *dat, u_int length);
static void l2tp_called_number_print(const u_char *dat, u_int length);
static void l2tp_calling_number_print(const u_char *dat, u_int length);
static void l2tp_sub_address_print(const u_char *dat, u_int length);
static void l2tp_tx_conn_speed_print(const u_char *dat, u_int length);
static void l2tp_phy_channel_id_print(const u_char *dat, u_int length);
static void l2tp_ini_recv_lcp_print(const u_char *dat, u_int length);
static void l2tp_last_sent_lcp_print(const u_char *dat, u_int length);
static void l2tp_last_recv_lcp_print(const u_char *dat, u_int length);
static void l2tp_proxy_auth_type_print(const u_char *dat, u_int length);
static void l2tp_proxy_auth_name_print(const u_char *dat, u_int length);
static void l2tp_proxy_auth_chal_print(const u_char *dat, u_int length);
static void l2tp_proxy_auth_id_print(const u_char *dat, u_int length);
static void l2tp_proxy_auth_resp_print(const u_char *dat, u_int length);
static void l2tp_call_errors_print(const u_char *dat, u_int length);
static void l2tp_accm_print(const u_char *dat, u_int length);
static void l2tp_random_vector_print(const u_char *dat, u_int length);
static void l2tp_private_grp_id_print(const u_char *dat, u_int length);
static void l2tp_rx_conn_speed_print(const u_char *dat, u_int length);
static void l2tp_seq_required_print(const u_char *dat, u_int length);
static void l2tp_avp_print(const u_char *dat, u_int length);
static struct l2tp_avp_vec l2tp_avp[] = {
{"MSGTYPE", l2tp_msgtype_print}, /* 0 Message Type */
{"RESULT_CODE", l2tp_result_code_print}, /* 1 Result Code */
{"PROTO_VER", l2tp_proto_ver_print}, /* 2 Protocol Version */
{"FRAMING_CAP", l2tp_framing_cap_print}, /* 3 Framing Capabilities */
{"BEARER_CAP", l2tp_bearer_cap_print}, /* 4 Bearer Capabilities */
{"TIE_BREAKER", l2tp_tie_breaker_print}, /* 5 Tie Breaker */
{"FIRM_VER", l2tp_firm_ver_print}, /* 6 Firmware Revision */
{"HOST_NAME", l2tp_host_name_print}, /* 7 Host Name */
{"VENDOR_NAME", l2tp_vendor_name_print}, /* 8 Vendor Name */
{"ASSND_TUN_ID", l2tp_assnd_tun_id_print}, /* 9 Assigned Tunnel ID */
{"RECV_WIN_SIZE", l2tp_recv_win_size_print}, /* 10 Receive Window Size */
{"CHALLENGE", l2tp_challenge_print}, /* 11 Challenge */
{"Q931_CC", l2tp_q931_cc_print}, /* 12 Q.931 Cause Code */
{"CHALLENGE_RESP", l2tp_challenge_resp_print},/* 13 Challenge Response */
{"ASSND_SESS_ID", l2tp_assnd_sess_id_print}, /* 14 Assigned Session ID */
{"CALL_SER_NUM", l2tp_call_ser_num_print}, /* 15 Call Serial Number */
{"MINIMUM_BPS", l2tp_minimum_bps_print},/* 16 Minimum BPS */
{"MAXIMUM_BPS", l2tp_maximum_bps_print}, /* 17 Maximum BPS */
{"BEARER_TYPE", l2tp_bearer_type_print},/* 18 Bearer Type */
{"FRAMING_TYPE", l2tp_framing_type_print}, /* 19 Framing Type */
{"PACKET_PROC_DELAY", l2tp_packet_proc_delay_print}, /* 20 Packet Processing Delay (OBSOLETE) */
{"CALLED_NUMBER", l2tp_called_number_print}, /* 21 Called Number */
{"CALLING_NUMBER", l2tp_calling_number_print},/* 22 Calling Number */
{"SUB_ADDRESS", l2tp_sub_address_print},/* 23 Sub-Address */
{"TX_CONN_SPEED", l2tp_tx_conn_speed_print}, /* 24 (Tx) Connect Speed */
{"PHY_CHANNEL_ID", l2tp_phy_channel_id_print},/* 25 Physical Channel ID */
{"INI_RECV_LCP", l2tp_ini_recv_lcp_print}, /* 26 Initial Received LCP CONFREQ */
{"LAST_SENT_LCP", l2tp_last_sent_lcp_print}, /* 27 Last Sent LCP CONFREQ */
{"LAST_RECV_LCP", l2tp_last_recv_lcp_print}, /* 28 Last Received LCP CONFREQ */
{"PROXY_AUTH_TYPE", l2tp_proxy_auth_type_print},/* 29 Proxy Authen Type */
{"PROXY_AUTH_NAME", l2tp_proxy_auth_name_print},/* 30 Proxy Authen Name */
{"PROXY_AUTH_CHAL", l2tp_proxy_auth_chal_print},/* 31 Proxy Authen Challenge */
{"PROXY_AUTH_ID", l2tp_proxy_auth_id_print}, /* 32 Proxy Authen ID */
{"PROXY_AUTH_RESP", l2tp_proxy_auth_resp_print},/* 33 Proxy Authen Response */
{"CALL_ERRORS", l2tp_call_errors_print}, /* 34 Call Errors */
{"ACCM", l2tp_accm_print}, /* 35 ACCM */
{"RANDOM_VECTOR", l2tp_random_vector_print}, /* 36 Random Vector */
{"PRIVATE_GRP_ID", l2tp_private_grp_id_print},/* 37 Private Group ID */
{"RX_CONN_SPEED", l2tp_rx_conn_speed_print}, /* 38 (Rx) Connect Speed */
{"SEQ_REQUIRED", l2tp_seq_required_print}, /* 39 Sequencing Required */
#define L2TP_MAX_AVP_INDEX 40
};
#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)
{
int i;
for (i=0; i<length; i++) {
printf("%c", *dat++);
}
}
static void
print_octets(const u_char *dat, u_int length)
{
int i;
for (i=0; i<length; i++) {
printf("%02x", *dat++);
}
}
static void
print_short(const u_short *dat)
{
printf("%u", ntohs(*dat));
}
static void
print_int(const u_int *dat)
{
printf("%lu", (u_long)ntohl(*dat));
}
/**********************************/
/* AVP-specific print out routines*/
/**********************************/
static void
l2tp_msgtype_print(const u_char *dat, u_int length)
{
u_short *ptr = (u_short *)dat;
if (ntohs(*ptr) < L2TP_MAX_MSGTYPE_INDEX) {
printf("%s", l2tp_message_type_string[ntohs(*ptr)]);
}
}
static void
l2tp_result_code_print(const u_char *dat, u_int length)
{
/* we just print out the result and error code number */
u_short *ptr = (u_short *)dat;
if (length == 2) { /* result code */
printf("%d", ntohs(*ptr));
} else if (length == 4) { /* result & error code */
printf("%d/%d", ntohs(*ptr), ntohs(*(ptr+1)));
} else if (length > 4) { /* result & error code & msg */
printf("%u/%u ", ntohs(*ptr), ntohs(*(ptr+1)));
print_string((u_char *)(ptr+2), length - 4);
}
}
static void
l2tp_proto_ver_print(const u_char *dat, u_int length)
{
printf("%d.%d", *dat, *(dat+1));
}
static void
l2tp_framing_cap_print(const u_char *dat, u_int length)
{
u_int *ptr = (u_int *)dat;
if (ntohl(*ptr) & L2TP_FRAMING_CAP_ASYNC_MASK) {
printf("A");
}
if (ntohl(*ptr) & L2TP_FRAMING_CAP_SYNC_MASK) {
printf("S");
}
}
static void
l2tp_bearer_cap_print(const u_char *dat, u_int length)
{
u_int *ptr = (u_int *)dat;
if (ntohl(*ptr) & L2TP_BEARER_CAP_ANALOG_MASK) {
printf("A");
}
if (ntohl(*ptr) & L2TP_BEARER_CAP_DIGITAL_MASK) {
printf("D");
}
}
static void
l2tp_tie_breaker_print(const u_char *dat, u_int length)
{
printf("%lx", *(u_long *)dat); /* XXX */
}
static void
l2tp_firm_ver_print(const u_char *dat, u_int length)
{
print_short((u_short *)dat);
}
static void
l2tp_host_name_print(const u_char *dat, u_int length)
{
print_string(dat, length);
}
static void
l2tp_vendor_name_print(const u_char *dat, u_int length)
{
print_string(dat, length);
}
static void
l2tp_assnd_tun_id_print(const u_char *dat, u_int length)
{
print_short((u_short *)dat);
}
static void
l2tp_recv_win_size_print(const u_char *dat, u_int length)
{
print_short((u_short *)dat);
}
static void
l2tp_challenge_print(const u_char *dat, u_int length)
{
print_octets(dat, length);
}
static void
l2tp_q931_cc_print(const u_char *dat, u_int length)
{
print_short((u_short *)dat);
print_short((u_short *)(dat + 2));
if (length > 3) {
printf(" ");
print_string(dat+3, length-3);
}
}
static void
l2tp_challenge_resp_print(const u_char *dat, u_int length)
{
print_octets(dat, 16); /* XXX length should be 16? */
}
static void
l2tp_assnd_sess_id_print(const u_char *dat, u_int length)
{
print_short((u_short *)dat);
}
static void
l2tp_call_ser_num_print(const u_char *dat, u_int length)
{
print_int((u_int *)dat);
}
static void
l2tp_minimum_bps_print(const u_char *dat, u_int length)
{
print_int((u_int *)dat);
}
static void
l2tp_maximum_bps_print(const u_char *dat, u_int length)
{
print_int((u_int *)dat);
}
static void
l2tp_bearer_type_print(const u_char *dat, u_int length)
{
u_int *ptr = (u_int *)dat;
if (ntohl(*ptr) & L2TP_BEARER_TYPE_ANALOG_MASK) {
printf("A");
}
if (ntohl(*ptr) & L2TP_BEARER_TYPE_DIGITAL_MASK) {
printf("D");
}
}
static void
l2tp_framing_type_print(const u_char *dat, u_int length)
{
u_int *ptr = (u_int *)dat;
if (ntohl(*ptr) & L2TP_FRAMING_TYPE_ASYNC_MASK) {
printf("A");
}
if (ntohl(*ptr) & L2TP_FRAMING_TYPE_SYNC_MASK) {
printf("S");
}
}
static void
l2tp_packet_proc_delay_print(const u_char *dat, u_int length)
{
printf("obsolete");
}
static void
l2tp_called_number_print(const u_char *dat, u_int length)
{
print_string(dat, length);
}
static void
l2tp_calling_number_print(const u_char *dat, u_int length)
{
print_string(dat, length);
}
static void
l2tp_sub_address_print(const u_char *dat, u_int length)
{
print_string(dat, length);
}
static void
l2tp_tx_conn_speed_print(const u_char *dat, u_int length)
{
print_int((u_int *)dat);
}
static void
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("%d", 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)) { /* IETF == 0 */
printf("vendor=%04x", ntohs(*ptr));
}
ptr++;
if (ntohs(*ptr) < L2TP_MAX_AVP_INDEX) {
printf("%s", l2tp_avp[ntohs(*ptr)].name);
printf("(");
if (!hidden && len >= 6) {
(l2tp_avp[ntohs(*ptr)].print)
((u_char *)ptr+2, len-6);
} else {
printf("???");
}
printf(")");
} else {
printf(" invalid AVP %u", ntohs(*ptr));
}
if (length >= len && len > 0)
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 (length < 6 || snapend - dat < 6) {
/* 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("(%d/", ntohs(*ptr++)); /* Tunnel ID */
printf("%d)", ntohs(*ptr++)); /* Session ID */
cnt += 4;
if (flag_s) {
printf("Ns=%d,", ntohs(*ptr++));
printf("Nr=%d", ntohs(*ptr++));
cnt += 4;
}
if (flag_o) {
pad = ntohs(*ptr++);
(u_char *)ptr += pad;
cnt += (2 + pad);
}
if (flag_t) {
if (length - cnt == 0) {
printf(" ZLB");
} else {
if (length >= cnt)
l2tp_avp_print((u_char *)ptr, length - cnt);
}
} else {
#if 0
printf(" {");
ppp_hdlc_print((u_char *)ptr, length - cnt);
printf("}");
#else
printf("[hdlc|]");
#endif
}
}