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/* $OpenBSD: l2tp_call.c,v 1.19 2015/12/05 16:10:31 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_call.c,v 1.19 2015/12/05 16:10:31 yasuoka Exp $ */ |
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/**@file L2TP LNS call */ |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <sys/time.h> |
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#include <stdlib.h> |
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#include <stddef.h> |
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#include <netinet/in.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <syslog.h> |
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#include <stdarg.h> |
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#include <unistd.h> |
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#include <event.h> |
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#include <net/if_dl.h> |
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#include "debugutil.h" |
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#include "bytebuf.h" |
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#include "hash.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 "npppd.h" |
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#include "l2tp_local.h" |
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#ifdef L2TP_CALL_DEBUG |
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#define L2TP_CALL_DBG(m) l2tp_call_log m |
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#define L2TP_CALL_ASSERT(x) ASSERT(x) |
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#else |
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#define L2TP_CALL_DBG(m) |
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#define L2TP_CALL_ASSERT(x) |
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#endif |
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static void l2tp_call_log (l2tp_call *, int, const char *, ...) __printflike(3,4); |
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static void l2tp_call_disconnect (l2tp_call *, int, int, const char *, struct l2tp_avp *[], int); |
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static int l2tp_call_recv_ICRQ (l2tp_call *, u_char *, int); |
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static int l2tp_call_send_ICRP (l2tp_call *); |
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static int l2tp_call_recv_ICCN (l2tp_call *, u_char *, int, dialin_proxy_info *); |
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static int l2tp_recv_CDN (l2tp_call *, u_char *, int); |
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static int l2tp_call_send_CDN (l2tp_call *, int, int, const char *, struct l2tp_avp *[], int); |
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static int l2tp_call_send_ZLB (l2tp_call *); |
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static inline const char *l2tp_call_state_string (l2tp_call *); |
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static int l2tp_call_bind_ppp (l2tp_call *, dialin_proxy_info *); |
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static void l2tp_call_notify_down (l2tp_call *); |
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static int l2tp_call_send_data_packet (l2tp_call *, bytebuffer *); |
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static int l2tp_call_ppp_output (npppd_ppp *, unsigned char *, int, int); |
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static void l2tp_call_closed_by_ppp (npppd_ppp *); |
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/* create {@link ::_l2tp_call L2TP call} instance */ |
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l2tp_call * |
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l2tp_call_create(void) |
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{ |
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l2tp_call *_this; |
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if ((_this = malloc(sizeof(l2tp_call))) == NULL) |
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return NULL; |
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return _this; |
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} |
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/* initialize {@link ::_l2tp_call L2TP call} instance */ |
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int |
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l2tp_call_init(l2tp_call *_this, l2tp_ctrl *ctrl) |
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{ |
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memset(_this, 0, sizeof(l2tp_call)); |
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_this->ctrl = ctrl; |
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if (l2tpd_assign_call(ctrl->l2tpd, _this) != 0) |
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return -1; |
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_this->use_seq = ctrl->data_use_seq; |
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return 0; |
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} |
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/* free {@link ::_l2tp_call L2TP call} instance */ |
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void |
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l2tp_call_destroy(l2tp_call *_this, int from_l2tp_ctrl) |
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{ |
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l2tpd_release_call(_this->ctrl->l2tpd, _this); |
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free(_this); |
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} |
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/* |
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* l2tp disconnect will occur when |
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* 1) disconnect request issued from nppdctl command |
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* 2) npppd is terminated |
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* in case 1) ppp_stop() is used to terminal. (PPP LCP TermReq) |
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* and in case 2) l2tp_call_disconnect() is used (L2TP CDN) |
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*/ |
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/* administrative reason disconnection */ |
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void |
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l2tp_call_admin_disconnect(l2tp_call *_this) |
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{ |
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l2tp_call_disconnect(_this, L2TP_CDN_RCODE_ADMINISTRATIVE_REASON, 0, |
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NULL, NULL, 0); |
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} |
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void |
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l2tp_call_drop(l2tp_call *_this) |
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{ |
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l2tp_call_disconnect(_this, 0, 0, NULL, NULL, 0); |
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} |
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/* |
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* disconnect l2tp connection |
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* @param result_code disconect without CDN, specify zero |
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*/ |
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static void |
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l2tp_call_disconnect(l2tp_call *_this, int result_code, int error_code, |
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const char *errmes, struct l2tp_avp *addavp[], int naddavp) |
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{ |
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L2TP_CALL_ASSERT(_this != NULL); |
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if (_this->state == L2TP_CALL_STATE_CLEANUP_WAIT) { |
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/* CDN received, or have been sent */ |
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l2tp_call_notify_down(_this); /* just in case */ |
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return; |
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} |
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if (result_code > 0) { |
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if (l2tp_call_send_CDN(_this, result_code, error_code, errmes, |
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addavp, naddavp) |
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!= 0) |
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l2tp_call_log(_this, LOG_ERR, "Error sending CDN: %m"); |
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} |
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_this->state = L2TP_CALL_STATE_CLEANUP_WAIT; |
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l2tp_call_notify_down(_this); |
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} |
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/* |
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* control packet |
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*/ |
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/* call it when control packet is received */ |
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int |
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l2tp_call_recv_packet(l2tp_ctrl *ctrl, l2tp_call *_this, int mestype, |
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u_char *pkt, int pktlen) |
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{ |
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int i, len, session_id, send_cdn; |
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l2tp_call *call; |
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dialin_proxy_info dpi; |
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/* when ICRQ, this will be NULL */ |
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L2TP_CALL_ASSERT(_this != NULL || |
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mestype == L2TP_AVP_MESSAGE_TYPE_ICRQ); |
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if (_this == NULL) { |
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if (mestype != L2TP_AVP_MESSAGE_TYPE_ICRQ) |
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return 1; |
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if ((_this = l2tp_call_create()) == NULL) { |
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l2tp_ctrl_log(ctrl, LOG_ERR, |
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"l2tp_call_create failed in %s(): %m", __func__); |
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return 1; |
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} |
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l2tp_call_init(_this, ctrl); |
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if (l2tp_call_recv_ICRQ(_this, pkt, pktlen) != 0) |
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return 1; |
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len = slist_length(&ctrl->call_list); |
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session_id = _this->id; |
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again: |
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/* assign a session ID */ |
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session_id &= 0xffff; |
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if (session_id == 0) |
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session_id = 1; |
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for (i = 0; i < len; i++) { |
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call = slist_get(&ctrl->call_list, i); |
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if (call->session_id == session_id) { |
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session_id++; |
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goto again; |
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} |
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} |
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_this->session_id = session_id; |
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/* add the l2tp_call to call list */ |
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slist_add(&_this->ctrl->call_list, _this); |
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if (l2tp_call_send_ICRP(_this) != 0) |
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return 1; |
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_this->state = L2TP_CALL_STATE_WAIT_CONN; |
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return 0; |
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} |
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/* state machine */ |
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send_cdn = 0; |
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switch (_this->state) { |
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default: |
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break; |
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case L2TP_CALL_STATE_WAIT_CONN: |
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switch (mestype) { |
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case L2TP_AVP_MESSAGE_TYPE_ICCN: |
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memset(&dpi, 0, sizeof(dpi)); |
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if (l2tp_call_recv_ICCN(_this, pkt, pktlen, &dpi) != 0) |
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return 1; |
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l2tp_call_bind_ppp(_this, &dpi); |
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l2tp_call_send_ZLB(_this); |
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_this->state = L2TP_CALL_STATE_ESTABLISHED; |
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_this->ctrl->ncalls++; |
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return 0; |
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case L2TP_AVP_MESSAGE_TYPE_ICRQ: |
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case L2TP_AVP_MESSAGE_TYPE_ICRP: |
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send_cdn = 1; |
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/* FALLTHROUGH */ |
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default: |
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l2tp_call_log(_this, LOG_ERR, |
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"Waiting ICCN. But received %s", |
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avp_mes_type_string(mestype)); |
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if (send_cdn) { |
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l2tp_call_disconnect(_this, |
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L2TP_CDN_RCODE_ERROR_CODE, |
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L2TP_ECODE_GENERIC_ERROR, "Illegal state.", |
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NULL, 0); |
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return 0; |
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} |
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} |
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break; |
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case L2TP_CALL_STATE_ESTABLISHED: |
248 |
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switch (mestype) { |
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case L2TP_AVP_MESSAGE_TYPE_CDN: |
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/* disconnect from peer. log it */ |
251 |
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l2tp_recv_CDN(_this, pkt, pktlen); |
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_this->state = L2TP_CALL_STATE_CLEANUP_WAIT; |
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l2tp_call_notify_down(_this); |
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l2tp_call_send_ZLB(_this); |
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return 0; |
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case L2TP_AVP_MESSAGE_TYPE_ICRQ: |
257 |
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case L2TP_AVP_MESSAGE_TYPE_ICRP: |
258 |
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case L2TP_AVP_MESSAGE_TYPE_ICCN: |
259 |
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send_cdn = 1; |
260 |
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break; |
261 |
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default: |
262 |
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break; |
263 |
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} |
264 |
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l2tp_call_log(_this, LOG_ERR, |
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"Call established. But received %s", |
266 |
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avp_mes_type_string(mestype)); |
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if (send_cdn) { |
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l2tp_call_disconnect(_this, |
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L2TP_CDN_RCODE_ERROR_CODE, |
270 |
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L2TP_ECODE_GENERIC_ERROR, "Illegal state.", |
271 |
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NULL, 0); |
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return 0; |
273 |
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} |
274 |
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l2tp_call_disconnect(_this, 0, 0, NULL, NULL, 0); |
275 |
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return 1; |
276 |
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} |
277 |
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l2tp_call_log(_this, LOG_INFO, "Received %s in unexpected state=%s", |
278 |
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avp_mes_type_string(mestype), l2tp_call_state_string(_this)); |
279 |
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l2tp_call_disconnect(_this, 0, 0, NULL, NULL, 0); |
280 |
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return 1; |
281 |
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} |
282 |
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/* |
283 |
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* receieve ICRQ |
284 |
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* @return return 0 if the ICRQ is acceptable. |
285 |
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* other values means fail to receive, and |
286 |
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* CDN was sent and status was updated. |
287 |
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*/ |
288 |
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static int |
289 |
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l2tp_call_recv_ICRQ(l2tp_call *_this, u_char *pkt, int pktlen) |
290 |
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{ |
291 |
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int avpsz, slen; |
292 |
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struct l2tp_avp *avp; |
293 |
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char buf[L2TP_AVP_MAXSIZ], emes[256]; |
294 |
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295 |
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avp = (struct l2tp_avp *)buf; |
296 |
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while (pktlen >= 6 && (avpsz = avp_enum(avp, pkt, pktlen, 1)) > 0) { |
297 |
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pkt += avpsz; |
298 |
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pktlen -= avpsz; |
299 |
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if (avp->vendor_id != 0) { |
300 |
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L2TP_CALL_DBG((_this, LOG_DEBUG, |
301 |
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"Received a Vendor-specific AVP vendor-id=%d " |
302 |
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"type=%d", avp->vendor_id, avp->attr_type)); |
303 |
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continue; |
304 |
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} |
305 |
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if (avp->is_hidden != 0) { |
306 |
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l2tp_call_log(_this, LOG_WARNING, |
307 |
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"Received AVP (%s/%d) is hidden. But we don't " |
308 |
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"share secret.", |
309 |
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avp_attr_type_string(avp->attr_type), |
310 |
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avp->attr_type); |
311 |
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if (avp->is_mandatory != 0) { |
312 |
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l2tp_call_disconnect(_this, |
313 |
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L2TP_CDN_RCODE_ERROR_CODE, |
314 |
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L2TP_ECODE_UNKNOWN_MANDATORY_AVP, NULL, |
315 |
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NULL, 0); |
316 |
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return 1; |
317 |
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} |
318 |
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continue; |
319 |
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} |
320 |
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switch (avp->attr_type) { |
321 |
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case L2TP_AVP_TYPE_MESSAGE_TYPE: |
322 |
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AVP_SIZE_CHECK(avp, ==, 8); |
323 |
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continue; |
324 |
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case L2TP_AVP_TYPE_ASSIGNED_SESSION_ID: |
325 |
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AVP_SIZE_CHECK(avp, ==, 8); |
326 |
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_this->peer_session_id = avp_get_val16(avp); |
327 |
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continue; |
328 |
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case L2TP_AVP_TYPE_CALL_SERIAL_NUMBER: |
329 |
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case L2TP_AVP_TYPE_BEARER_TYPE: |
330 |
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case L2TP_AVP_TYPE_PHYSICAL_CHANNEL_ID: |
331 |
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/* |
332 |
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* Memo: |
333 |
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* Microsoft "L2TP/IPsec VPN Client" for |
334 |
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* Windows 98/Me/NT asserts mandatory bit in |
335 |
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* Physical Channel Id |
336 |
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*/ |
337 |
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break; |
338 |
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case L2TP_AVP_TYPE_CALLING_NUMBER: |
339 |
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slen = MINIMUM(sizeof(_this->calling_number) - 1, |
340 |
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avp_attr_length(avp)); |
341 |
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memcpy(_this->calling_number, avp->attr_value, slen); |
342 |
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_this->calling_number[slen] = '\0'; |
343 |
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break; |
344 |
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case L2TP_AVP_TYPE_CALLED_NUMBER: |
345 |
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case L2TP_AVP_TYPE_SUB_ADDRESS: |
346 |
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continue; |
347 |
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default: |
348 |
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if (avp->is_mandatory) { |
349 |
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l2tp_call_log(_this, LOG_WARNING, |
350 |
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"AVP (%s/%d) is not supported, but it's " |
351 |
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"mandatory", |
352 |
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avp_attr_type_string(avp->attr_type), |
353 |
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avp->attr_type); |
354 |
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if (avp->is_mandatory != 0) { |
355 |
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l2tp_call_disconnect(_this, |
356 |
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L2TP_CDN_RCODE_ERROR_CODE, |
357 |
|
|
L2TP_ECODE_UNKNOWN_MANDATORY_AVP, |
358 |
|
|
NULL, NULL, 0); |
359 |
|
|
return 1; |
360 |
|
|
} |
361 |
|
|
#ifdef L2TP_CALL_DEBUG |
362 |
|
|
} else { |
363 |
|
|
L2TP_CALL_DBG((_this, LOG_DEBUG, |
364 |
|
|
"AVP (%s/%d) is not handled", |
365 |
|
|
avp_attr_type_string(avp->attr_type), |
366 |
|
|
avp->attr_type)); |
367 |
|
|
#endif |
368 |
|
|
} |
369 |
|
|
} |
370 |
|
|
} |
371 |
|
|
if (_this->peer_session_id == 0) { |
372 |
|
|
l2tp_call_log(_this, LOG_ERR, |
373 |
|
|
"Received a bad ICRP: SessionId = 0"); |
374 |
|
|
l2tp_call_disconnect(_this, L2TP_CDN_RCODE_ERROR_CODE, |
375 |
|
|
L2TP_ECODE_INVALID_MESSAGE, "Session Id must not be 0", |
376 |
|
|
NULL, 0); |
377 |
|
|
return 1; |
378 |
|
|
} |
379 |
|
|
l2tp_call_log(_this, LOG_INFO, "RecvICRQ session_id=%u", |
380 |
|
|
_this->peer_session_id); |
381 |
|
|
|
382 |
|
|
return 0; |
383 |
|
|
size_check_failed: |
384 |
|
|
l2tp_call_log(_this, LOG_ERR, "Received bad ICRQ: %s", emes); |
385 |
|
|
l2tp_call_disconnect(_this, L2TP_CDN_RCODE_ERROR_CODE, |
386 |
|
|
L2TP_ECODE_WRONG_LENGTH, NULL, NULL, 0); |
387 |
|
|
|
388 |
|
|
return 1; |
389 |
|
|
} |
390 |
|
|
|
391 |
|
|
/* send ICRP */ |
392 |
|
|
static int |
393 |
|
|
l2tp_call_send_ICRP(l2tp_call *_this) |
394 |
|
|
{ |
395 |
|
|
int rval; |
396 |
|
|
struct l2tp_avp *avp; |
397 |
|
|
char buf[L2TP_AVP_MAXSIZ]; |
398 |
|
|
bytebuffer *bytebuf; |
399 |
|
|
|
400 |
|
|
bytebuf = l2tp_ctrl_prepare_snd_buffer(_this->ctrl, 1); |
401 |
|
|
if (bytebuf == NULL) { |
402 |
|
|
l2tp_call_log(_this, LOG_ERR, "sending ICRP failed: no buffer"); |
403 |
|
|
return 1; |
404 |
|
|
} |
405 |
|
|
avp = (struct l2tp_avp *)buf; |
406 |
|
|
|
407 |
|
|
/* Message Type = ICRP */ |
408 |
|
|
memset(avp, 0, sizeof(*avp)); |
409 |
|
|
avp->is_mandatory = 1; |
410 |
|
|
avp->attr_type = L2TP_AVP_TYPE_MESSAGE_TYPE; |
411 |
|
|
avp_set_val16(avp, L2TP_AVP_MESSAGE_TYPE_ICRP); |
412 |
|
|
bytebuf_add_avp(bytebuf, avp, 2); |
413 |
|
|
|
414 |
|
|
memset(avp, 0, sizeof(*avp)); |
415 |
|
|
avp->is_mandatory = 1; |
416 |
|
|
avp->attr_type = L2TP_AVP_TYPE_ASSIGNED_SESSION_ID; |
417 |
|
|
avp_set_val16(avp, _this->session_id); |
418 |
|
|
bytebuf_add_avp(bytebuf, avp, 2); |
419 |
|
|
|
420 |
|
|
if ((rval = l2tp_ctrl_send_packet(_this->ctrl, _this->peer_session_id, |
421 |
|
|
bytebuf)) != 0) { |
422 |
|
|
l2tp_call_log(_this, LOG_ERR, "failed to SendICRP: %m"); |
423 |
|
|
return 1; |
424 |
|
|
} |
425 |
|
|
l2tp_call_log(_this, LOG_INFO, "SendICRP session_id=%u", |
426 |
|
|
_this->session_id); |
427 |
|
|
return 0; |
428 |
|
|
} |
429 |
|
|
|
430 |
|
|
/* send L2TP data message */ |
431 |
|
|
static int |
432 |
|
|
l2tp_call_send_data_packet(l2tp_call *_this, bytebuffer *buffer) |
433 |
|
|
{ |
434 |
|
|
int rval; |
435 |
|
|
struct l2tp_header *hdr; |
436 |
|
|
|
437 |
|
|
bytebuffer_flip(buffer); |
438 |
|
|
hdr = (struct l2tp_header *)bytebuffer_pointer(buffer); |
439 |
|
|
memset(hdr, 0, sizeof(*hdr) - 4); /* Nr, NS are option */ |
440 |
|
|
|
441 |
|
|
hdr->t = 0; |
442 |
|
|
hdr->ver = L2TP_HEADER_VERSION_RFC2661; |
443 |
|
|
hdr->l = 1; |
444 |
|
|
hdr->length = htons(bytebuffer_remaining(buffer)); |
445 |
|
|
hdr->tunnel_id = htons(_this->ctrl->peer_tunnel_id); |
446 |
|
|
hdr->session_id = htons(_this->peer_session_id); |
447 |
|
|
if (_this->use_seq) { |
448 |
|
|
hdr->s = 1; |
449 |
|
|
hdr->ns = htons(_this->snd_nxt++); |
450 |
|
|
hdr->nr = htons(_this->rcv_nxt); |
451 |
|
|
} |
452 |
|
|
|
453 |
|
|
if (L2TP_CTRL_CONF(_this->ctrl)->data_out_pktdump != 0) { |
454 |
|
|
l2tpd_log(_this->ctrl->l2tpd, LOG_DEBUG, |
455 |
|
|
"ctrl=%u call=%u L2TP Data output packet dump", |
456 |
|
|
_this->ctrl->id, _this->id); |
457 |
|
|
show_hd(debug_get_debugfp(), bytebuffer_pointer(buffer), |
458 |
|
|
bytebuffer_remaining(buffer)); |
459 |
|
|
} |
460 |
|
|
if ((rval = l2tp_ctrl_send(_this->ctrl, bytebuffer_pointer(buffer), |
461 |
|
|
bytebuffer_remaining(buffer))) < 0) { |
462 |
|
|
L2TP_CALL_DBG((_this, LOG_DEBUG, "sendto() failed: %m")); |
463 |
|
|
} |
464 |
|
|
|
465 |
|
|
return (rval == bytebuffer_remaining(buffer))? 0 : 1; |
466 |
|
|
} |
467 |
|
|
|
468 |
|
|
/* |
469 |
|
|
* receive ICCN |
470 |
|
|
* @return return 0 if the ICCN is acceptable. |
471 |
|
|
* other value means fail to receive, and |
472 |
|
|
* CDN was sent and status was updated. |
473 |
|
|
*/ |
474 |
|
|
static int |
475 |
|
|
l2tp_call_recv_ICCN(l2tp_call *_this, u_char *pkt, int pktlen, |
476 |
|
|
dialin_proxy_info *dpi) |
477 |
|
|
{ |
478 |
|
|
int avpsz, tx_conn_speed; |
479 |
|
|
uint32_t framing_type = 0; |
480 |
|
|
struct l2tp_avp *avp; |
481 |
|
|
char buf[L2TP_AVP_MAXSIZ], emes[256]; |
482 |
|
|
|
483 |
|
|
tx_conn_speed = 0; |
484 |
|
|
avp = (struct l2tp_avp *)buf; |
485 |
|
|
while (pktlen >= 6 && (avpsz = avp_enum(avp, pkt, pktlen, 1)) > 0) { |
486 |
|
|
pkt += avpsz; |
487 |
|
|
pktlen -= avpsz; |
488 |
|
|
if (avp->vendor_id != 0) { |
489 |
|
|
L2TP_CALL_DBG((_this, LOG_DEBUG, |
490 |
|
|
"Received a Vendor-specific AVP vendor-id=%d " |
491 |
|
|
"type=%d", avp->vendor_id, avp->attr_type)); |
492 |
|
|
continue; |
493 |
|
|
} |
494 |
|
|
if (avp->is_hidden != 0) { |
495 |
|
|
l2tp_call_log(_this, LOG_WARNING, |
496 |
|
|
"Received AVP (%s/%d) is hidden. But we don't " |
497 |
|
|
"share secret.", |
498 |
|
|
avp_attr_type_string(avp->attr_type), |
499 |
|
|
avp->attr_type); |
500 |
|
|
if (avp->is_mandatory != 0) { |
501 |
|
|
l2tp_call_disconnect(_this, |
502 |
|
|
L2TP_CDN_RCODE_ERROR_CODE, |
503 |
|
|
L2TP_ECODE_UNKNOWN_MANDATORY_AVP, NULL, |
504 |
|
|
NULL, 0); |
505 |
|
|
return 1; |
506 |
|
|
} |
507 |
|
|
continue; |
508 |
|
|
} |
509 |
|
|
switch (avp->attr_type) { |
510 |
|
|
case L2TP_AVP_TYPE_MESSAGE_TYPE: |
511 |
|
|
AVP_SIZE_CHECK(avp, ==, 8); |
512 |
|
|
continue; |
513 |
|
|
case L2TP_AVP_TYPE_RX_CONNECT_SPEED: |
514 |
|
|
/* |
515 |
|
|
* As RFC 2661 this AVP is not mandatory. But `xl2tpd' |
516 |
|
|
* sends this as a mandatory AVP. Handle this to |
517 |
|
|
* ignore the xl2tpd' bug. |
518 |
|
|
*/ |
519 |
|
|
AVP_SIZE_CHECK(avp, ==, 10); |
520 |
|
|
continue; |
521 |
|
|
case L2TP_AVP_TYPE_TX_CONNECT_SPEED: |
522 |
|
|
AVP_SIZE_CHECK(avp, ==, 10); |
523 |
|
|
tx_conn_speed = avp_get_val32(avp); |
524 |
|
|
continue; |
525 |
|
|
case L2TP_AVP_TYPE_FRAMING_TYPE: |
526 |
|
|
AVP_SIZE_CHECK(avp, ==, 10); |
527 |
|
|
framing_type = avp_get_val32(avp); |
528 |
|
|
continue; |
529 |
|
|
case L2TP_AVP_TYPE_SEQUENCING_REQUIRED: |
530 |
|
|
_this->seq_required = 1; |
531 |
|
|
_this->use_seq = 1; |
532 |
|
|
continue; |
533 |
|
|
/* |
534 |
|
|
* AVP's for Proxy-LCP and Proxy-Authen |
535 |
|
|
*/ |
536 |
|
|
case L2TP_AVP_TYPE_LAST_SENT_LCP_CONFREQ: |
537 |
|
|
AVP_MAXLEN_CHECK(avp, sizeof(dpi->last_sent_lcp.data)); |
538 |
|
|
memcpy(dpi->last_sent_lcp.data, avp->attr_value, |
539 |
|
|
avp_attr_length(avp)); |
540 |
|
|
dpi->last_sent_lcp.ldata = avp_attr_length(avp); |
541 |
|
|
break; |
542 |
|
|
case L2TP_AVP_TYPE_LAST_RECV_LCP_CONFREQ: |
543 |
|
|
AVP_MAXLEN_CHECK(avp, sizeof(dpi->last_recv_lcp.data)); |
544 |
|
|
memcpy(dpi->last_recv_lcp.data, avp->attr_value, |
545 |
|
|
avp_attr_length(avp)); |
546 |
|
|
dpi->last_recv_lcp.ldata = avp_attr_length(avp); |
547 |
|
|
break; |
548 |
|
|
case L2TP_AVP_TYPE_PROXY_AUTHEN_CHALLENGE: |
549 |
|
|
AVP_MAXLEN_CHECK(avp, sizeof(dpi->auth_chall)); |
550 |
|
|
memcpy(dpi->auth_chall, avp->attr_value, |
551 |
|
|
avp_attr_length(avp)); |
552 |
|
|
dpi->lauth_chall = avp_attr_length(avp); |
553 |
|
|
break; |
554 |
|
|
case L2TP_AVP_TYPE_PROXY_AUTHEN_ID: |
555 |
|
|
AVP_SIZE_CHECK(avp, ==, 8); |
556 |
|
|
dpi->auth_id = avp_get_val16(avp); |
557 |
|
|
break; |
558 |
|
|
case L2TP_AVP_TYPE_PROXY_AUTHEN_NAME: |
559 |
|
|
AVP_MAXLEN_CHECK(avp, sizeof(dpi->username) - 1); |
560 |
|
|
memcpy(dpi->username, avp->attr_value, |
561 |
|
|
avp_attr_length(avp)); |
562 |
|
|
break; |
563 |
|
|
case L2TP_AVP_TYPE_PROXY_AUTHEN_RESPONSE: |
564 |
|
|
AVP_MAXLEN_CHECK(avp, sizeof(dpi->auth_resp)); |
565 |
|
|
memcpy(dpi->auth_resp, avp->attr_value, |
566 |
|
|
avp_attr_length(avp)); |
567 |
|
|
dpi->lauth_resp = avp_attr_length(avp); |
568 |
|
|
break; |
569 |
|
|
case L2TP_AVP_TYPE_PROXY_AUTHEN_TYPE: |
570 |
|
|
AVP_SIZE_CHECK(avp, ==, 8); |
571 |
|
|
switch (avp_get_val16(avp)) { |
572 |
|
|
default: |
573 |
|
|
l2tp_call_log(_this, LOG_WARNING, |
574 |
|
|
"RecvICCN Unknown proxy-authen-type=%d", |
575 |
|
|
avp_get_val16(avp)); |
576 |
|
|
/* FALLTHROUGH */ |
577 |
|
|
case L2TP_AUTH_TYPE_NO_AUTH: |
578 |
|
|
dpi->auth_type = 0; |
579 |
|
|
break; |
580 |
|
|
case L2TP_AUTH_TYPE_PPP_CHAP: |
581 |
|
|
dpi->auth_type = PPP_AUTH_CHAP_MD5; |
582 |
|
|
break; |
583 |
|
|
case L2TP_AUTH_TYPE_PPP_PAP: |
584 |
|
|
dpi->auth_type = PPP_AUTH_PAP; |
585 |
|
|
break; |
586 |
|
|
case L2TP_AUTH_TYPE_MS_CHAP_V1: |
587 |
|
|
dpi->auth_type = PPP_AUTH_CHAP_MS; |
588 |
|
|
break; |
589 |
|
|
} |
590 |
|
|
break; |
591 |
|
|
default: |
592 |
|
|
if (avp->is_mandatory != 0) { |
593 |
|
|
l2tp_call_log(_this, LOG_WARNING, |
594 |
|
|
"AVP (%s/%d) is not supported, but it's " |
595 |
|
|
"mandatory", |
596 |
|
|
avp_attr_type_string(avp->attr_type), |
597 |
|
|
avp->attr_type); |
598 |
|
|
l2tp_call_disconnect(_this, |
599 |
|
|
L2TP_CDN_RCODE_ERROR_CODE, |
600 |
|
|
L2TP_ECODE_UNKNOWN_MANDATORY_AVP, NULL, |
601 |
|
|
NULL, 0); |
602 |
|
|
return 1; |
603 |
|
|
#ifdef L2TP_CALL_DEBUG |
604 |
|
|
} else { |
605 |
|
|
L2TP_CALL_DBG((_this, LOG_DEBUG, |
606 |
|
|
"AVP (%s/%d) is not handled", |
607 |
|
|
avp_attr_type_string(avp->attr_type), |
608 |
|
|
avp->attr_type)); |
609 |
|
|
#endif |
610 |
|
|
} |
611 |
|
|
} |
612 |
|
|
} |
613 |
|
|
l2tp_call_log(_this, LOG_INFO, "RecvICCN " |
614 |
|
|
"session_id=%u calling_number=%s tx_conn_speed=%u framing=%s", |
615 |
|
|
_this->peer_session_id, _this->calling_number, tx_conn_speed, |
616 |
|
|
((framing_type & L2TP_FRAMING_CAP_FLAGS_ASYNC) != 0)? "async" : |
617 |
|
|
((framing_type & L2TP_FRAMING_CAP_FLAGS_SYNC) != 0)? "sync" : |
618 |
|
|
"unknown"); |
619 |
|
|
|
620 |
|
|
return 0; |
621 |
|
|
size_check_failed: |
622 |
|
|
l2tp_call_log(_this, LOG_ERR, "Received bad ICCN: %s", emes); |
623 |
|
|
l2tp_call_disconnect(_this, L2TP_CDN_RCODE_ERROR_CODE, |
624 |
|
|
L2TP_ECODE_WRONG_LENGTH, NULL, NULL, 0); |
625 |
|
|
return 1; |
626 |
|
|
} |
627 |
|
|
|
628 |
|
|
/* receive CDN */ |
629 |
|
|
static int |
630 |
|
|
l2tp_recv_CDN(l2tp_call *_this, u_char *pkt, int pktlen) |
631 |
|
|
{ |
632 |
|
|
int result, error, avpsz, len, sessid; |
633 |
|
|
struct l2tp_avp *avp; |
634 |
|
|
char buf[L2TP_AVP_MAXSIZ], emes[256], pmes[256]; |
635 |
|
|
|
636 |
|
|
/* initialize */ |
637 |
|
|
result = 0; |
638 |
|
|
error = 0; |
639 |
|
|
sessid = 0; |
640 |
|
|
strlcpy(pmes, "(none)", sizeof(pmes)); |
641 |
|
|
|
642 |
|
|
avp = (struct l2tp_avp *)buf; |
643 |
|
|
while (pktlen >= 6 && (avpsz = avp_enum(avp, pkt, pktlen, 1)) > 0) { |
644 |
|
|
pkt += avpsz; |
645 |
|
|
pktlen -= avpsz; |
646 |
|
|
if (avp->vendor_id != 0) { |
647 |
|
|
L2TP_CALL_DBG((_this, LOG_DEBUG, |
648 |
|
|
"Received a Vendor-specific AVP vendor-id=%d " |
649 |
|
|
"type=%d", avp->vendor_id, avp->attr_type)); |
650 |
|
|
continue; |
651 |
|
|
} |
652 |
|
|
if (avp->is_hidden != 0) { |
653 |
|
|
l2tp_call_log(_this, LOG_WARNING, |
654 |
|
|
"Received AVP (%s/%d) is hidden. But we don't " |
655 |
|
|
"share secret.", |
656 |
|
|
avp_attr_type_string(avp->attr_type), |
657 |
|
|
avp->attr_type); |
658 |
|
|
if (avp->is_mandatory != 0) { |
659 |
|
|
l2tp_call_disconnect(_this, |
660 |
|
|
L2TP_CDN_RCODE_ERROR_CODE, |
661 |
|
|
L2TP_ECODE_UNKNOWN_MANDATORY_AVP, NULL, |
662 |
|
|
NULL, 0); |
663 |
|
|
return 1; |
664 |
|
|
} |
665 |
|
|
continue; |
666 |
|
|
} |
667 |
|
|
switch (avp->attr_type) { |
668 |
|
|
case L2TP_AVP_TYPE_MESSAGE_TYPE: |
669 |
|
|
AVP_SIZE_CHECK(avp, ==, 8); |
670 |
|
|
continue; |
671 |
|
|
case L2TP_AVP_TYPE_RESULT_CODE: |
672 |
|
|
AVP_SIZE_CHECK(avp, >=, 8); |
673 |
|
|
result = avp->attr_value[0] << 8 | avp->attr_value[1]; |
674 |
|
|
if (avp->length >= 10) { |
675 |
|
|
error = avp->attr_value[2] << 8 | |
676 |
|
|
avp->attr_value[3]; |
677 |
|
|
len = avp->length - 12; |
678 |
|
|
if (len > 0) { |
679 |
|
|
len = MINIMUM(len, sizeof(pmes) - 1); |
680 |
|
|
memcpy(pmes, &avp->attr_value[4], len); |
681 |
|
|
pmes[len] = '\0'; |
682 |
|
|
} |
683 |
|
|
} |
684 |
|
|
continue; |
685 |
|
|
case L2TP_AVP_TYPE_ASSIGNED_SESSION_ID: |
686 |
|
|
AVP_SIZE_CHECK(avp, >=, 8); |
687 |
|
|
sessid = avp_get_val16(avp); |
688 |
|
|
continue; |
689 |
|
|
default: |
690 |
|
|
if (avp->is_mandatory) { |
691 |
|
|
l2tp_call_log(_this, LOG_WARNING, |
692 |
|
|
"AVP (%s/%d) is not supported, but it's " |
693 |
|
|
"mandatory", |
694 |
|
|
avp_attr_type_string(avp->attr_type), |
695 |
|
|
avp->attr_type); |
696 |
|
|
if (avp->is_mandatory != 0) { |
697 |
|
|
l2tp_call_disconnect(_this, |
698 |
|
|
L2TP_CDN_RCODE_ERROR_CODE, |
699 |
|
|
L2TP_ECODE_UNKNOWN_MANDATORY_AVP, |
700 |
|
|
NULL, NULL, 0); |
701 |
|
|
return 1; |
702 |
|
|
} |
703 |
|
|
#ifdef L2TP_CALL_DEBUG |
704 |
|
|
} else { |
705 |
|
|
L2TP_CALL_DBG((_this, LOG_DEBUG, |
706 |
|
|
"AVP (%s/%d) is not handled", |
707 |
|
|
avp_attr_type_string(avp->attr_type), |
708 |
|
|
avp->attr_type)); |
709 |
|
|
#endif |
710 |
|
|
} |
711 |
|
|
} |
712 |
|
|
} |
713 |
|
|
if (error == 0) { |
714 |
|
|
l2tp_call_log(_this, LOG_INFO, |
715 |
|
|
"RecvCDN result=%s/%d", l2tp_cdn_rcode_string(result), |
716 |
|
|
result); |
717 |
|
|
} else { |
718 |
|
|
l2tp_call_log(_this, LOG_INFO, |
719 |
|
|
"RecvCDN result=%s/%d error=%s/%d message=%s", |
720 |
|
|
l2tp_cdn_rcode_string(result), result, |
721 |
|
|
l2tp_ecode_string(error), error, pmes); |
722 |
|
|
} |
723 |
|
|
|
724 |
|
|
return 0; |
725 |
|
|
|
726 |
|
|
size_check_failed: |
727 |
|
|
/* continue to process even if the CDN message was broken */ |
728 |
|
|
l2tp_call_log(_this, LOG_ERR, "Received bad CDN: %s", emes); |
729 |
|
|
|
730 |
|
|
return 0; |
731 |
|
|
} |
732 |
|
|
|
733 |
|
|
/* send CDN */ |
734 |
|
|
static int |
735 |
|
|
l2tp_call_send_CDN(l2tp_call *_this, int result_code, int error_code, const |
736 |
|
|
char *errmes, struct l2tp_avp *addavp[], int naddavp) |
737 |
|
|
{ |
738 |
|
|
uint32_t val32; |
739 |
|
|
int i, avplen, len; |
740 |
|
|
struct l2tp_avp *avp; |
741 |
|
|
char buf[L2TP_AVP_MAXSIZ]; |
742 |
|
|
bytebuffer *bytebuf; |
743 |
|
|
|
744 |
|
|
L2TP_CALL_ASSERT(_this != NULL); |
745 |
|
|
bytebuf = l2tp_ctrl_prepare_snd_buffer(_this->ctrl, 1); |
746 |
|
|
if (bytebuf == NULL) { |
747 |
|
|
l2tp_call_log(_this, LOG_ERR, "sending CDN failed: no buffer"); |
748 |
|
|
return 1; |
749 |
|
|
} |
750 |
|
|
avp = (struct l2tp_avp *)buf; |
751 |
|
|
|
752 |
|
|
/* Message Type = CDN */ |
753 |
|
|
memset(avp, 0, sizeof(*avp)); |
754 |
|
|
avp->is_mandatory = 1; |
755 |
|
|
avp->attr_type = L2TP_AVP_TYPE_MESSAGE_TYPE; |
756 |
|
|
avp_set_val16(avp, L2TP_AVP_MESSAGE_TYPE_CDN); |
757 |
|
|
bytebuf_add_avp(bytebuf, avp, 2); |
758 |
|
|
|
759 |
|
|
/* Result Code */ |
760 |
|
|
memset(avp, 0, sizeof(*avp)); |
761 |
|
|
avp->is_mandatory = 1; |
762 |
|
|
avp->attr_type = L2TP_AVP_TYPE_RESULT_CODE; |
763 |
|
|
#if 0 |
764 |
|
|
/* |
765 |
|
|
* Windows 2000 work around: |
766 |
|
|
* Windows 2000 will return "2 - Length is wrong" in StopCCN, |
767 |
|
|
* when it received "length = 8 and no error code AVP". |
768 |
|
|
* Avoid the error, use AVP length = 10. |
769 |
|
|
*/ |
770 |
|
|
if (error_code > 0) { |
771 |
|
|
val32 = (result_code << 16) | (error_code & 0xffff); |
772 |
|
|
avplen = 4; |
773 |
|
|
avp_set_val32(avp, val32); |
774 |
|
|
} else { |
775 |
|
|
avplen = 2; |
776 |
|
|
avp_set_val16(avp, result_code); |
777 |
|
|
} |
778 |
|
|
#else |
779 |
|
|
val32 = (result_code << 16) | (error_code & 0xffff); |
780 |
|
|
avplen = 4; |
781 |
|
|
avp_set_val32(avp, val32); |
782 |
|
|
#endif |
783 |
|
|
|
784 |
|
|
if (errmes != NULL) { |
785 |
|
|
len = MINIMUM(strlen(errmes), L2TP_AVP_MAXSIZ - 128); |
786 |
|
|
memcpy(&avp->attr_value[avplen], errmes, len); |
787 |
|
|
avplen += len; |
788 |
|
|
} |
789 |
|
|
bytebuf_add_avp(bytebuf, avp, avplen); |
790 |
|
|
|
791 |
|
|
/* Assigned Session Id */ |
792 |
|
|
memset(avp, 0, sizeof(*avp)); |
793 |
|
|
avp->is_mandatory = 1; |
794 |
|
|
avp->attr_type = L2TP_AVP_TYPE_ASSIGNED_SESSION_ID; |
795 |
|
|
if (_this != NULL && _this->session_id != 0) |
796 |
|
|
avp_set_val16(avp, _this->session_id); |
797 |
|
|
else |
798 |
|
|
avp_set_val16(avp, 0); |
799 |
|
|
bytebuf_add_avp(bytebuf, avp, 2); |
800 |
|
|
|
801 |
|
|
for (i = 0; i < naddavp; i++) |
802 |
|
|
bytebuf_add_avp(bytebuf, addavp[i], addavp[i]->length - 6); |
803 |
|
|
|
804 |
|
|
if (l2tp_ctrl_send_packet(_this->ctrl, _this->peer_session_id, |
805 |
|
|
bytebuf) != 0) { |
806 |
|
|
l2tp_call_log(_this, LOG_ERR, "Error sending CDN: %m"); |
807 |
|
|
return 1; |
808 |
|
|
} |
809 |
|
|
|
810 |
|
|
if (error_code > 0) { |
811 |
|
|
l2tp_call_log(_this, LOG_INFO, |
812 |
|
|
"SendCDN result=%s/%d error=%s/%d messsage=%s", |
813 |
|
|
l2tp_cdn_rcode_string(result_code), result_code, |
814 |
|
|
l2tp_ecode_string(error_code), error_code, |
815 |
|
|
(errmes == NULL)? "none" : errmes); |
816 |
|
|
} else { |
817 |
|
|
l2tp_call_log(_this, LOG_INFO, "SendCDN result=%s/%d", |
818 |
|
|
l2tp_cdn_rcode_string(result_code), result_code); |
819 |
|
|
} |
820 |
|
|
|
821 |
|
|
return 0; |
822 |
|
|
} |
823 |
|
|
|
824 |
|
|
/* send ZLB */ |
825 |
|
|
static int |
826 |
|
|
l2tp_call_send_ZLB(l2tp_call *_this) |
827 |
|
|
{ |
828 |
|
|
bytebuffer *bytebuf; |
829 |
|
|
|
830 |
|
|
l2tp_call_log(_this, LOG_INFO, "SendZLB"); |
831 |
|
|
bytebuf = l2tp_ctrl_prepare_snd_buffer(_this->ctrl, 1); |
832 |
|
|
if (bytebuf == NULL) { |
833 |
|
|
l2tp_call_log(_this, LOG_ERR, "sending ZLB failed: no buffer"); |
834 |
|
|
return 1; |
835 |
|
|
} |
836 |
|
|
return l2tp_ctrl_send_packet(_this->ctrl, _this->peer_session_id, |
837 |
|
|
bytebuf); |
838 |
|
|
} |
839 |
|
|
|
840 |
|
|
/* |
841 |
|
|
* misc |
842 |
|
|
*/ |
843 |
|
|
/* logging with the label of the instance */ |
844 |
|
|
static void |
845 |
|
|
l2tp_call_log(l2tp_call *_this, int prio, const char *fmt, ...) |
846 |
|
|
{ |
847 |
|
|
char logbuf[BUFSIZ]; |
848 |
|
|
va_list ap; |
849 |
|
|
|
850 |
|
|
va_start(ap, fmt); |
851 |
|
|
#ifdef L2TPD_MULTIPLE |
852 |
|
|
snprintf(logbuf, sizeof(logbuf), "l2tpd id=%u ctrl=%u call=%u %s", |
853 |
|
|
_this->ctrl->l2tpd->id, _this->ctrl->id, _this->id, fmt); |
854 |
|
|
#else |
855 |
|
|
snprintf(logbuf, sizeof(logbuf), "l2tpd ctrl=%u call=%u %s", |
856 |
|
|
_this->ctrl->id, _this->id, fmt); |
857 |
|
|
#endif |
858 |
|
|
vlog_printf(prio, logbuf, ap); |
859 |
|
|
va_end(ap); |
860 |
|
|
} |
861 |
|
|
|
862 |
|
|
/* convert current status to strings */ |
863 |
|
|
static inline const char * |
864 |
|
|
l2tp_call_state_string(l2tp_call *_this) |
865 |
|
|
{ |
866 |
|
|
switch (_this->state) { |
867 |
|
|
case L2TP_CALL_STATE_IDLE: return "idle"; |
868 |
|
|
case L2TP_CALL_STATE_WAIT_CONN: return "wait-conn"; |
869 |
|
|
case L2TP_CALL_STATE_ESTABLISHED: return "established"; |
870 |
|
|
case L2TP_CALL_STATE_CLEANUP_WAIT: return "cleanup-wait"; |
871 |
|
|
} |
872 |
|
|
return "unknown"; |
873 |
|
|
} |
874 |
|
|
|
875 |
|
|
/* |
876 |
|
|
* npppd physical layer |
877 |
|
|
*/ |
878 |
|
|
|
879 |
|
|
/* input packet to ppp */ |
880 |
|
|
void |
881 |
|
|
l2tp_call_ppp_input(l2tp_call *_this, u_char *pkt, int pktlen, int delayed) |
882 |
|
|
{ |
883 |
|
|
int rval; |
884 |
|
|
npppd_ppp *ppp; |
885 |
|
|
|
886 |
|
|
ppp = _this->ppp; |
887 |
|
|
rval = ppp->recv_packet(ppp, pkt, pktlen, |
888 |
|
|
delayed ? PPP_IO_FLAGS_DELAYED : 0); |
889 |
|
|
|
890 |
|
|
if (_this->ppp == NULL) /* ppp is freed */ |
891 |
|
|
return; |
892 |
|
|
|
893 |
|
|
if (rval != 0) |
894 |
|
|
ppp->ierrors++; |
895 |
|
|
else { |
896 |
|
|
ppp->ipackets++; |
897 |
|
|
ppp->ibytes += pktlen; |
898 |
|
|
} |
899 |
|
|
} |
900 |
|
|
|
901 |
|
|
/* called ppp output a packet */ |
902 |
|
|
static int |
903 |
|
|
l2tp_call_ppp_output(npppd_ppp *ppp, unsigned char *bytes, int nbytes, |
904 |
|
|
int flags) |
905 |
|
|
{ |
906 |
|
|
l2tp_call *_this; |
907 |
|
|
bytebuffer *bytebuf; |
908 |
|
|
|
909 |
|
|
_this = ppp->phy_context; |
910 |
|
|
|
911 |
|
|
bytebuf = l2tp_ctrl_prepare_snd_buffer(_this->ctrl, _this->use_seq); |
912 |
|
|
|
913 |
|
|
if (bytebuf != NULL) { |
914 |
|
|
bytebuffer_put(bytebuf, bytes, nbytes); |
915 |
|
|
if (l2tp_call_send_data_packet(_this, bytebuf) != 0) |
916 |
|
|
ppp->oerrors++; |
917 |
|
|
else { |
918 |
|
|
ppp->opackets++; |
919 |
|
|
ppp->obytes += nbytes; |
920 |
|
|
} |
921 |
|
|
} else |
922 |
|
|
ppp->oerrors++; |
923 |
|
|
|
924 |
|
|
return 0; |
925 |
|
|
} |
926 |
|
|
|
927 |
|
|
/* it will be called when the connection was closed at ppp */ |
928 |
|
|
static void |
929 |
|
|
l2tp_call_closed_by_ppp(npppd_ppp *ppp) |
930 |
|
|
{ |
931 |
|
|
l2tp_call *_this; |
932 |
|
|
|
933 |
|
|
L2TP_CALL_ASSERT(ppp != NULL); |
934 |
|
|
L2TP_CALL_ASSERT(ppp->phy_context != NULL); |
935 |
|
|
|
936 |
|
|
_this = ppp->phy_context; |
937 |
|
|
|
938 |
|
|
/* do before l2tp_call_disconnect() */ |
939 |
|
|
_this->ppp = NULL; |
940 |
|
|
|
941 |
|
|
if (_this->state == L2TP_CALL_STATE_CLEANUP_WAIT) { |
942 |
|
|
/* no need to call l2tp_call_disconnect */ |
943 |
|
|
} else if (ppp->disconnect_code == PPP_DISCON_NO_INFORMATION) { |
944 |
|
|
l2tp_call_disconnect(_this, |
945 |
|
|
L2TP_CDN_RCODE_ADMINISTRATIVE_REASON, 0, NULL, NULL, 0); |
946 |
|
|
} else { |
947 |
|
|
/* |
948 |
|
|
* RFC3145 L2TP Disconnect Cause Information |
949 |
|
|
*/ |
950 |
|
|
struct l2tp_avp *avp[1]; |
951 |
|
|
struct _ppp_cause { |
952 |
|
|
struct l2tp_avp avp; |
953 |
|
|
uint16_t code; |
954 |
|
|
uint16_t proto; |
955 |
|
|
uint8_t direction; |
956 |
|
|
char message[128]; |
957 |
|
|
} __attribute__((__packed__)) ppp_cause; |
958 |
|
|
|
959 |
|
|
ppp_cause.avp.is_mandatory = 0; |
960 |
|
|
ppp_cause.avp.is_hidden = 0; |
961 |
|
|
ppp_cause.avp.vendor_id = 0; /* ietf */ |
962 |
|
|
ppp_cause.avp.attr_type = |
963 |
|
|
L2TP_AVP_TYPE_PPP_DISCONNECT_CAUSE_CODE; |
964 |
|
|
ppp_cause.code = htons(ppp->disconnect_code); |
965 |
|
|
ppp_cause.proto = htons(ppp->disconnect_proto); |
966 |
|
|
ppp_cause.direction = ppp->disconnect_direction; |
967 |
|
|
ppp_cause.avp.length = offsetof(struct _ppp_cause, message[0]); |
968 |
|
|
|
969 |
|
|
if (ppp->disconnect_message != NULL) { |
970 |
|
|
strlcpy(ppp_cause.message, ppp->disconnect_message, |
971 |
|
|
sizeof(ppp_cause.message)); |
972 |
|
|
ppp_cause.avp.length += strlen(ppp_cause.message); |
973 |
|
|
} |
974 |
|
|
avp[0] = &ppp_cause.avp; |
975 |
|
|
l2tp_call_disconnect(_this, |
976 |
|
|
L2TP_CDN_RCODE_ERROR_CODE, L2TP_ECODE_GENERIC_ERROR, |
977 |
|
|
"Disconnected by local PPP", avp, 1); |
978 |
|
|
} |
979 |
|
|
l2tp_call_log(_this, LOG_NOTICE, "logtype=PPPUnbind"); |
980 |
|
|
} |
981 |
|
|
|
982 |
|
|
/* notify disconnection to ppp to terminate or free of ppp */ |
983 |
|
|
static void |
984 |
|
|
l2tp_call_notify_down(l2tp_call *_this) |
985 |
|
|
{ |
986 |
|
|
if (_this->ppp != NULL) |
987 |
|
|
ppp_phy_downed(_this->ppp); |
988 |
|
|
} |
989 |
|
|
|
990 |
|
|
/* bind ppp */ |
991 |
|
|
static int |
992 |
|
|
l2tp_call_bind_ppp(l2tp_call *_this, dialin_proxy_info *dpi) |
993 |
|
|
{ |
994 |
|
|
int code, errcode; |
995 |
|
|
npppd_ppp *ppp; |
996 |
|
|
|
997 |
|
|
code = L2TP_CDN_RCODE_BUSY; |
998 |
|
|
errcode = 0; |
999 |
|
|
ppp = NULL; |
1000 |
|
|
if ((ppp = ppp_create()) == NULL) |
1001 |
|
|
goto fail; |
1002 |
|
|
|
1003 |
|
|
ASSERT(_this->ppp == NULL); |
1004 |
|
|
|
1005 |
|
|
if (_this->ppp != NULL) |
1006 |
|
|
return -1; |
1007 |
|
|
|
1008 |
|
|
_this->ppp = ppp; |
1009 |
|
|
|
1010 |
|
|
ppp->tunnel_type = NPPPD_TUNNEL_L2TP; |
1011 |
|
|
ppp->tunnel_session_id = _this->session_id; |
1012 |
|
|
ppp->phy_context = _this; |
1013 |
|
|
ppp->send_packet = l2tp_call_ppp_output; |
1014 |
|
|
ppp->phy_close = l2tp_call_closed_by_ppp; |
1015 |
|
|
|
1016 |
|
|
strlcpy(ppp->phy_label, L2TP_CTRL_LISTENER_TUN_NAME(_this->ctrl), |
1017 |
|
|
sizeof(ppp->phy_label)); |
1018 |
|
|
L2TP_CALL_ASSERT(sizeof(ppp->phy_info) >= _this->ctrl->peer.ss_len); |
1019 |
|
|
memcpy(&ppp->phy_info, &_this->ctrl->peer, |
1020 |
|
|
MINIMUM(sizeof(ppp->phy_info), _this->ctrl->peer.ss_len)); |
1021 |
|
|
strlcpy(ppp->calling_number, _this->calling_number, |
1022 |
|
|
sizeof(ppp->calling_number)); |
1023 |
|
|
if (ppp_init(npppd_get_npppd(), ppp) != 0) { |
1024 |
|
|
l2tp_call_log(_this, LOG_ERR, "failed binding ppp"); |
1025 |
|
|
goto fail; |
1026 |
|
|
} |
1027 |
|
|
|
1028 |
|
|
l2tp_call_log(_this, LOG_NOTICE, "logtype=PPPBind ppp=%d", ppp->id); |
1029 |
|
|
if (DIALIN_PROXY_IS_REQUESTED(dpi)) { |
1030 |
|
|
if (!L2TP_CTRL_CONF(_this->ctrl)->accept_dialin) { |
1031 |
|
|
l2tp_call_log(_this, LOG_ERR, |
1032 |
|
|
"'accept_dialin' is 'false' in the setting."); |
1033 |
|
|
code = L2TP_CDN_RCODE_ERROR_CODE; |
1034 |
|
|
errcode = L2TP_ECODE_INVALID_MESSAGE; |
1035 |
|
|
goto fail; |
1036 |
|
|
} |
1037 |
|
|
|
1038 |
|
|
if (ppp_dialin_proxy_prepare(ppp, dpi) != 0) { |
1039 |
|
|
code = L2TP_CDN_RCODE_TEMP_NOT_AVALIABLE; |
1040 |
|
|
goto fail; |
1041 |
|
|
} |
1042 |
|
|
} |
1043 |
|
|
ppp_start(ppp); |
1044 |
|
|
|
1045 |
|
|
return 0; |
1046 |
|
|
fail: |
1047 |
|
|
if (ppp != NULL) |
1048 |
|
|
ppp_destroy(ppp); |
1049 |
|
|
_this->ppp = NULL; |
1050 |
|
|
|
1051 |
|
|
l2tp_call_disconnect(_this, code, errcode, NULL, NULL, 0); |
1052 |
|
|
return 1; |
1053 |
|
|
} |