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/* $OpenBSD: l2tp_subr.c,v 1.4 2012/05/08 13:15:11 yasuoka Exp $ */ |
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/*- |
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* Copyright (c) 2009 Internet Initiative Japan Inc. |
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* 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 the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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/* $Id: l2tp_subr.c,v 1.4 2012/05/08 13:15:11 yasuoka Exp $ */ |
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/**@file L2TP related sub-routines */ |
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#include <sys/types.h> |
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#include <sys/time.h> |
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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <syslog.h> |
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#include <string.h> |
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#include <event.h> |
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#ifdef USE_LIBSOCKUTIL |
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#include <seil/sockfromto.h> |
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#endif |
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#include "debugutil.h" |
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#include "hash.h" |
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#include "bytebuf.h" |
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#include "slist.h" |
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#include "l2tp.h" |
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#include "l2tp_subr.h" |
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#include "l2tp_local.h" |
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#ifdef L2TP_SUBR_DEBUG |
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#define L2TP_SUBR_ASSERT(x) ASSERT(x) |
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#else |
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#define L2TP_SUBR_ASSERT(x) |
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#endif |
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/* |
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* AVP |
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*/ |
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int |
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avp_enum(struct l2tp_avp *avp, const u_char *pkt, int pktlen, int filldata) |
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{ |
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uint16_t flags; |
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L2TP_SUBR_ASSERT(pktlen >= 6); |
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if (pktlen < 6) |
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return -1; |
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GETSHORT(flags, pkt); |
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avp->is_mandatory = ((flags & 0x8000) != 0)? 1 : 0; |
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avp->is_hidden = ((flags & 0x4000) != 0)? 1 : 0; |
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avp->length = flags & 0x03ff; |
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GETSHORT(avp->vendor_id, pkt); |
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avp->attr_type = *pkt << 8; |
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avp->attr_type |= *(pkt + 1); |
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pkt += 2; |
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if (avp->length > pktlen) |
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return -1; |
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if (filldata != 0) |
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memcpy(avp->attr_value, pkt, avp->length - 6); |
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return avp->length; |
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} |
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#define NAME_VAL(x) { x, #x } |
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static struct _label_name { |
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int label; |
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const char *name; |
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} |
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l2tp_mes_type_names[] = { |
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NAME_VAL(L2TP_AVP_MESSAGE_TYPE_SCCRQ), |
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NAME_VAL(L2TP_AVP_MESSAGE_TYPE_SCCRP), |
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NAME_VAL(L2TP_AVP_MESSAGE_TYPE_SCCCN), |
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NAME_VAL(L2TP_AVP_MESSAGE_TYPE_StopCCN), |
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NAME_VAL(L2TP_AVP_MESSAGE_TYPE_HELLO), |
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NAME_VAL(L2TP_AVP_MESSAGE_TYPE_OCRQ), |
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NAME_VAL(L2TP_AVP_MESSAGE_TYPE_OCRP), |
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NAME_VAL(L2TP_AVP_MESSAGE_TYPE_OCCN), |
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NAME_VAL(L2TP_AVP_MESSAGE_TYPE_ICRQ), |
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NAME_VAL(L2TP_AVP_MESSAGE_TYPE_ICRP), |
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NAME_VAL(L2TP_AVP_MESSAGE_TYPE_ICCN), |
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NAME_VAL(L2TP_AVP_MESSAGE_TYPE_CDN), |
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}, |
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l2tp_avp_attribute_names[] = { |
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NAME_VAL(L2TP_AVP_TYPE_MESSAGE_TYPE), |
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NAME_VAL(L2TP_AVP_TYPE_RESULT_CODE), |
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NAME_VAL(L2TP_AVP_TYPE_PROTOCOL_VERSION), |
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NAME_VAL(L2TP_AVP_TYPE_FRAMING_CAPABILITIES), |
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NAME_VAL(L2TP_AVP_TYPE_BEARER_CAPABILITIES), |
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NAME_VAL(L2TP_AVP_TYPE_TIE_BREAKER), |
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NAME_VAL(L2TP_AVP_TYPE_FIRMWARE_REVISION), |
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NAME_VAL(L2TP_AVP_TYPE_HOST_NAME), |
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NAME_VAL(L2TP_AVP_TYPE_VENDOR_NAME), |
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NAME_VAL(L2TP_AVP_TYPE_ASSINGED_TUNNEL_ID), |
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NAME_VAL(L2TP_AVP_TYPE_RECV_WINDOW_SIZE), |
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NAME_VAL(L2TP_AVP_TYPE_CHALLENGE), |
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NAME_VAL(L2TP_AVP_TYPE_CAUSE_CODE), |
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NAME_VAL(L2TP_AVP_TYPE_CHALLENGE_RESPONSE), |
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NAME_VAL(L2TP_AVP_TYPE_ASSIGNED_SESSION_ID), |
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NAME_VAL(L2TP_AVP_TYPE_CALL_SERIAL_NUMBER), |
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NAME_VAL(L2TP_AVP_TYPE_MINIMUM_BPS), |
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NAME_VAL(L2TP_AVP_TYPE_MAXIMUM_BPS), |
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NAME_VAL(L2TP_AVP_TYPE_BEARER_TYPE), |
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NAME_VAL(L2TP_AVP_TYPE_FRAMING_TYPE), |
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NAME_VAL(L2TP_AVP_TYPE_CALLED_NUMBER), |
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NAME_VAL(L2TP_AVP_TYPE_CALLING_NUMBER), |
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NAME_VAL(L2TP_AVP_TYPE_SUB_ADDRESS), |
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NAME_VAL(L2TP_AVP_TYPE_TX_CONNECT_SPEED), |
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NAME_VAL(L2TP_AVP_TYPE_PHYSICAL_CHANNEL_ID), |
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NAME_VAL(L2TP_AVP_TYPE_INITIAL_RECV_LCP_CONFREQ), |
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NAME_VAL(L2TP_AVP_TYPE_LAST_SENT_LCP_CONFREQ), |
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NAME_VAL(L2TP_AVP_TYPE_LAST_RECV_LCP_CONFREQ), |
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NAME_VAL(L2TP_AVP_TYPE_PROXY_AUTHEN_TYPE), |
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NAME_VAL(L2TP_AVP_TYPE_PROXY_AUTHEN_NAME), |
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NAME_VAL(L2TP_AVP_TYPE_PROXY_AUTHEN_CHALLENGE), |
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NAME_VAL(L2TP_AVP_TYPE_PROXY_AUTHEN_ID), |
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NAME_VAL(L2TP_AVP_TYPE_PROXY_AUTHEN_RESPONSE), |
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NAME_VAL(L2TP_AVP_TYPE_CALL_ERRORS), |
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NAME_VAL(L2TP_AVP_TYPE_ACCM), |
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NAME_VAL(L2TP_AVP_TYPE_RANDOM_VECTOR), |
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NAME_VAL(L2TP_AVP_TYPE_PRIVATE_GROUP_ID), |
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NAME_VAL(L2TP_AVP_TYPE_RX_CONNECT_SPEED), |
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NAME_VAL(L2TP_AVP_TYPE_SEQUENCING_REQUIRED), |
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NAME_VAL(L2TP_AVP_TYPE_TX_MINIMUM), |
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NAME_VAL(L2TP_AVP_TYPE_CALLING_SUB_ADDRESS), |
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NAME_VAL(L2TP_AVP_TYPE_PPP_DISCONNECT_CAUSE_CODE), |
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NAME_VAL(L2TP_AVP_TYPE_CCDS), |
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NAME_VAL(L2TP_AVP_TYPE_SDS), |
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NAME_VAL(L2TP_AVP_TYPE_LCP_WANT_OPTIONS), |
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NAME_VAL(L2TP_AVP_TYPE_LCP_ALLOW_OPTIONS), |
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NAME_VAL(L2TP_AVP_TYPE_LNS_LAST_SENT_LCP_CONFREQ), |
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NAME_VAL(L2TP_AVP_TYPE_LNS_LAST_RECV_LCP_CONFREQ), |
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NAME_VAL(L2TP_AVP_TYPE_MODEM_ON_HOLD_CAPABLE), |
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NAME_VAL(L2TP_AVP_TYPE_MODEM_ON_HOLD_STATUS), |
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NAME_VAL(L2TP_AVP_TYPE_PPPOE_RELAY), |
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NAME_VAL(L2TP_AVP_TYPE_PPPOE_RELAY_RESP_CAP), |
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NAME_VAL(L2TP_AVP_TYPE_PPPOE_RELAY_FORW_CAP), |
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NAME_VAL(L2TP_AVP_TYPE_EXTENDED_VENDOR_ID), |
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NAME_VAL(L2TP_AVP_TYPE_PSEUDOWIRE_CAP_LIST), |
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NAME_VAL(L2TP_AVP_TYPE_LOCAL_SESSION_ID), |
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NAME_VAL(L2TP_AVP_TYPE_REMOTE_SESSION_ID), |
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NAME_VAL(L2TP_AVP_TYPE_ASSIGNED_COOKIE), |
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NAME_VAL(L2TP_AVP_TYPE_REMOTE_END_ID), |
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NAME_VAL(L2TP_AVP_TYPE_APPLICATION_CODE), |
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NAME_VAL(L2TP_AVP_TYPE_PSEUDOWIRE_TYPE), |
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NAME_VAL(L2TP_AVP_TYPE_L2_SPECIFIC_SUBLAYER), |
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NAME_VAL(L2TP_AVP_TYPE_DATA_SEQUENCING), |
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NAME_VAL(L2TP_AVP_TYPE_CIRCUIT_STATUS), |
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NAME_VAL(L2TP_AVP_TYPE_PREFERRED_LANGUAGE), |
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NAME_VAL(L2TP_AVP_TYPE_CTRL_MSG_AUTH_NONCE), |
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NAME_VAL(L2TP_AVP_TYPE_TX_CONNECT_SPEED), |
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NAME_VAL(L2TP_AVP_TYPE_RX_CONNECT_SPEED), |
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NAME_VAL(L2TP_AVP_TYPE_FAILOVER_CAPABILITY), |
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NAME_VAL(L2TP_AVP_TYPE_TUNNEL_RECOVERY), |
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NAME_VAL(L2TP_AVP_TYPE_SUGGESTED_CTRL_SEQUENCE), |
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NAME_VAL(L2TP_AVP_TYPE_FAILOVER_SESSION_STATE), |
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NAME_VAL(L2TP_AVP_TYPE_MULTICAST_CAPABILITY), |
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NAME_VAL(L2TP_AVP_TYPE_NEW_OUTGOING_SESSIONS), |
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NAME_VAL(L2TP_AVP_TYPE_NEW_OUTGOING_SESSIONS_ACK), |
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NAME_VAL(L2TP_AVP_TYPE_WITHDRAW_OUTGOING_SESSIONS), |
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NAME_VAL(L2TP_AVP_TYPE_MULTICAST_PACKETS_PRIORITY), |
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}, |
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l2tp_stopccn_rcode_names[] = { |
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NAME_VAL(L2TP_STOP_CCN_RCODE_GENERAL), |
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NAME_VAL(L2TP_STOP_CCN_RCODE_GENERAL_ERROR), |
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NAME_VAL(L2TP_STOP_CCN_RCODE_ALREADY_EXISTS), |
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NAME_VAL(L2TP_STOP_CCN_RCODE_UNAUTHORIZED), |
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NAME_VAL(L2TP_STOP_CCN_RCODE_BAD_PROTOCOL_VERSION), |
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NAME_VAL(L2TP_STOP_CCN_RCODE_SHUTTING_DOWN), |
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NAME_VAL(L2TP_STOP_CCN_RCODE_FSM_ERROR), |
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}, |
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l2tp_cdn_rcode_names[] = { |
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NAME_VAL(L2TP_CDN_RCODE_LOST_CARRIER), |
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NAME_VAL(L2TP_CDN_RCODE_ERROR_CODE), |
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NAME_VAL(L2TP_CDN_RCODE_ADMINISTRATIVE_REASON), |
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NAME_VAL(L2TP_CDN_RCODE_TEMP_NOT_AVALIABLE), |
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NAME_VAL(L2TP_CDN_RCODE_PERM_NOT_AVALIABLE), |
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NAME_VAL(L2TP_CDN_RCODE_INVALID_DESTINATION), |
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NAME_VAL(L2TP_CDN_RCODE_NO_CARRIER), |
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NAME_VAL(L2TP_CDN_RCODE_BUSY), |
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NAME_VAL(L2TP_CDN_RCODE_NO_DIALTONE), |
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NAME_VAL(L2TP_CDN_RCODE_CALL_TIMEOUT_BY_LAC), |
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NAME_VAL(L2TP_CDN_RCODE_NO_FRAMING_DETECTED), |
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}, |
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l2tp_ecode_names[] = { |
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NAME_VAL(L2TP_ECODE_NO_CONTROL_CONNECTION), |
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NAME_VAL(L2TP_ECODE_WRONG_LENGTH), |
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NAME_VAL(L2TP_ECODE_INVALID_MESSAGE), |
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NAME_VAL(L2TP_ECODE_NO_RESOURCE), |
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NAME_VAL(L2TP_ECODE_INVALID_SESSION_ID), |
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NAME_VAL(L2TP_ECODE_GENERIC_ERROR), |
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NAME_VAL(L2TP_ECODE_TRY_ANOTHER), |
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NAME_VAL(L2TP_ECODE_UNKNOWN_MANDATORY_AVP), |
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}; |
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#undef NAME_VAL |
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const char * |
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avp_attr_type_string(int attr_type) |
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{ |
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int i; |
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for (i = 0; i < countof(l2tp_avp_attribute_names); i++) { |
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if (attr_type == l2tp_avp_attribute_names[i].label) |
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return l2tp_avp_attribute_names[i].name + 14; |
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} |
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return "UNKNOWN_AVP"; |
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} |
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const char * |
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l2tp_stopccn_rcode_string(int rcode) |
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{ |
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int i; |
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for (i = 0; i < countof(l2tp_stopccn_rcode_names); i++) { |
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if (rcode == l2tp_stopccn_rcode_names[i].label) |
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return l2tp_stopccn_rcode_names[i].name + 20; |
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} |
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return "UNKNOWN"; |
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} |
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const char * |
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l2tp_cdn_rcode_string(int rcode) |
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{ |
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int i; |
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for (i = 0; i < countof(l2tp_cdn_rcode_names); i++) { |
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if (rcode == l2tp_cdn_rcode_names[i].label) |
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return l2tp_cdn_rcode_names[i].name + 15; |
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} |
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return "UNKNOWN"; |
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} |
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const char * |
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l2tp_ecode_string(int ecode) |
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{ |
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int i; |
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if (ecode == 0) |
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return "none"; |
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for (i = 0; i < countof(l2tp_ecode_names); i++) { |
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if (ecode == l2tp_ecode_names[i].label) |
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return l2tp_ecode_names[i].name + 11; |
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} |
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return "UNKNOWN"; |
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} |
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/** |
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* Search the AVP that matches given vendor_id and attr_type and return it |
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* In case the "fill_data" is specified (non 0 value is specified as the |
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* "fill_data"), the memory space of the "avp" must be larger than or equal |
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* to L2TP_AVP_MAXSIZ (1024). |
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*/ |
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struct l2tp_avp * |
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avp_find(struct l2tp_avp *avp, const u_char *pkt, int pktlen, |
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uint16_t vendor_id, uint16_t attr_type, int fill_data) |
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{ |
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int avpsz; |
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while (pktlen >= 6 && |
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(avpsz = avp_enum(avp, pkt, pktlen, fill_data)) > 0) { |
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if (avp->vendor_id != vendor_id || avp->attr_type != attr_type) { |
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if (avpsz < 6) |
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return NULL; |
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pkt += avpsz; |
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pktlen -= avpsz; |
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continue; |
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} |
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return avp; |
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} |
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return NULL; |
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} |
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301 |
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/** |
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* Search the Message-Type AVP and return it. The memory space of the "avp" |
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* must be larger than or equal to L2TP_AVP_MAXSIZ (1024). |
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*/ |
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struct l2tp_avp * |
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avp_find_message_type_avp(struct l2tp_avp *avp, const u_char *pkt, int pktlen) |
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{ |
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return avp_find(avp, pkt, pktlen, 0, L2TP_AVP_TYPE_MESSAGE_TYPE, 1); |
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} |
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311 |
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/** |
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* add an AVP to bytebuffer |
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*/ |
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int |
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bytebuf_add_avp(bytebuffer *bytebuf, struct l2tp_avp *avp, int value_len) |
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{ |
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struct l2tp_avp avp1; |
318 |
|
|
|
319 |
|
|
memcpy(&avp1, avp, sizeof(struct l2tp_avp)); |
320 |
|
|
|
321 |
|
|
avp1.length = value_len + 6; |
322 |
|
|
avp1.vendor_id = htons(avp->vendor_id); |
323 |
|
|
avp1.attr_type = htons(avp->attr_type); |
324 |
|
|
*(uint16_t *)&avp1 = htons(*(uint16_t *)&avp1); |
325 |
|
|
|
326 |
|
|
if (bytebuffer_put(bytebuf, &avp1, 6) == NULL) |
327 |
|
|
return -1; |
328 |
|
|
if (bytebuffer_put(bytebuf, avp->attr_value, value_len) == NULL) |
329 |
|
|
return -1; |
330 |
|
|
|
331 |
|
|
return 0; |
332 |
|
|
} |
333 |
|
|
|
334 |
|
|
const char * |
335 |
|
|
avp_mes_type_string(int mes_type) |
336 |
|
|
{ |
337 |
|
|
int i; |
338 |
|
|
|
339 |
|
|
for (i = 0; i < countof(l2tp_mes_type_names); i++) { |
340 |
|
|
if (mes_type == l2tp_mes_type_names[i].label) |
341 |
|
|
return l2tp_mes_type_names[i].name + 22; |
342 |
|
|
} |
343 |
|
|
return "Unknown"; |
344 |
|
|
} |