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/* $OpenBSD: pptp_call.c,v 1.9 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: pptp_call.c,v 1.9 2015/12/05 16:10:31 yasuoka Exp $ */ |
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/**@file PPTP Call */ |
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/* currently it supports PAC mode only */ |
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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 <netinet/in.h> |
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#include <net/if_dl.h> |
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#include <stdio.h> |
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#include <stdarg.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <syslog.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 "bytebuf.h" |
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#include "slist.h" |
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#include "hash.h" |
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#include "debugutil.h" |
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#include "time_utils.h" |
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#include "pptp.h" |
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#include "pptp_local.h" |
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#include "pptp_subr.h" |
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#include "npppd.h" |
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#ifdef PPTP_CALL_DEBUG |
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#define PPTP_CALL_DBG(x) pptp_call_log x |
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#define PPTP_CALL_ASSERT(x) ASSERT(x) |
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#else |
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#define PPTP_CALL_DBG(x) |
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#define PPTP_CALL_ASSERT(x) |
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#endif |
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static void pptp_call_log (pptp_call *, int, const char *, ...) __printflike(3,4); |
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static void pptp_call_notify_down (pptp_call *); |
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static int pptp_call_recv_SLI (pptp_call *, u_char *, int); |
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static int pptp_call_recv_CCR (pptp_call *, u_char *, int); |
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static int pptp_call_recv_OCRQ (pptp_call *, u_char *, int); |
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static void pptp_call_send_CDN (pptp_call *, int, int, int, const char *); |
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static int pptp_call_send_OCRP (pptp_call *, int, int, int); |
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static int pptp_call_gre_output (pptp_call *, int, int, u_char *, int); |
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static int pptp_call_bind_ppp (pptp_call *); |
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static void pptp_call_log (pptp_call *, int, const char *, ...); |
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static void pptp_call_OCRQ_string (struct pptp_ocrq *, char *, int); |
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static void pptp_call_OCRP_string (struct pptp_ocrp *, char *, int); |
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static void pptp_call_ppp_input (pptp_call *, unsigned char *, int, int); |
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static char * pptp_call_state_string(int); |
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static int pptp_call_ppp_output (npppd_ppp *, unsigned char *, int, int); |
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static void pptp_call_closed_by_ppp (npppd_ppp *); |
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/* not used |
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static int pptp_call_send_SLI (pptp_call *); |
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*/ |
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#define SEQ_LT(a,b) ((int)((a) - (b)) < 0) |
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#define SEQ_LE(a,b) ((int)((a) - (b)) <= 0) |
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#define SEQ_GT(a,b) ((int)((a) - (b)) > 0) |
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#define SEQ_GE(a,b) ((int)((a) - (b)) >= 0) |
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#define SEQ_SUB(a,b) ((int32_t)((a) - (b))) |
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/* round-up division */ |
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#define RUPDIV(n,d) (((n) + ((d) - ((n) % (d)))) / (d)) |
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/* |
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* instance related functions |
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*/ |
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pptp_call * |
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pptp_call_create(void) |
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{ |
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pptp_call *_this; |
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if ((_this = malloc(sizeof(pptp_call))) == NULL) |
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return NULL; |
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return _this; |
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} |
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int |
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pptp_call_init(pptp_call *_this, pptp_ctrl *ctrl) |
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{ |
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memset(_this, 0, sizeof(pptp_call)); |
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_this->ctrl = ctrl; |
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_this->maxwinsz = PPTP_CALL_DEFAULT_MAXWINSZ; |
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_this->winsz = RUPDIV(_this->maxwinsz, 2); |
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_this->last_io = get_monosec(); |
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_this->snd_nxt = 1; |
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return 0; |
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} |
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int |
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pptp_call_start(pptp_call *_this) |
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{ |
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if (pptp_call_bind_ppp(_this) != 0) |
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return 1; |
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return 0; |
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} |
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int |
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pptp_call_stop(pptp_call *_this) |
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{ |
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if (_this->state != PPTP_CALL_STATE_CLEANUP_WAIT) |
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pptp_call_disconnect(_this, 0, 0, NULL); |
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pptp_call_log(_this, LOG_NOTICE, "logtype=Terminated"); |
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pptpd_release_call(_this->ctrl->pptpd, _this); |
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return 0; |
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} |
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void |
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pptp_call_destroy(pptp_call *_this) |
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{ |
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PPTP_CALL_ASSERT(_this != NULL); |
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free(_this); |
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} |
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void |
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pptp_call_disconnect(pptp_call *_this, int result, int error, const char * |
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statistics) |
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{ |
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if (_this->state == PPTP_CALL_STATE_CLEANUP_WAIT) { |
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pptp_call_notify_down(_this); |
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return; |
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} |
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if (result > 0) |
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pptp_call_send_CDN(_this, result, error, 0, statistics); |
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_this->state = PPTP_CALL_STATE_CLEANUP_WAIT; |
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pptp_call_notify_down(_this); |
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} |
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/* |
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* PPTP control packet I/O |
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*/ |
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void |
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pptp_call_input(pptp_call *_this, int mes_type, u_char *pkt, int lpkt) |
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{ |
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PPTP_CALL_ASSERT(_this != NULL); |
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PPTP_CALL_ASSERT(pkt != NULL); |
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PPTP_CALL_ASSERT(lpkt >= 4); |
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_this->last_io = get_monosec(); |
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switch (mes_type) { |
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case PPTP_CTRL_MES_CODE_OCRQ: |
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if (_this->state != PPTP_CALL_STATE_IDLE) { |
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pptp_call_send_OCRP(_this, |
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PPTP_OCRP_RESULT_GENERIC_ERROR, |
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PPTP_ERROR_BAD_CALL, 0); |
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goto bad_state; |
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} |
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if (pptp_call_recv_OCRQ(_this, pkt, lpkt) != 0) { |
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pptp_call_send_OCRP(_this, |
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PPTP_OCRP_RESULT_GENERIC_ERROR, |
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PPTP_ERROR_BAD_CALL, 0); |
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return; |
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} |
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if (pptpd_assign_call(_this->ctrl->pptpd, _this) != 0) { |
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pptp_call_send_OCRP(_this, PPTP_OCRP_RESULT_BUSY, |
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PPTP_ERROR_NONE, 0); |
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return; |
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} |
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if (pptp_call_send_OCRP(_this, PPTP_OCRP_RESULT_CONNECTED, |
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PPTP_ERROR_NONE, 0) != 0) { |
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pptp_call_disconnect(_this, |
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PPTP_CDN_RESULT_GENRIC_ERROR, |
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PPTP_ERROR_PAC_ERROR, NULL); |
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return; |
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} |
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if (pptp_call_start(_this) != 0) { |
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pptp_call_disconnect(_this, |
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PPTP_CDN_RESULT_GENRIC_ERROR, |
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PPTP_ERROR_PAC_ERROR, NULL); |
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return; |
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} |
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_this->state = PPTP_CALL_STATE_ESTABLISHED; |
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break; |
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case PPTP_CTRL_MES_CODE_SLI: |
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if (pptp_call_recv_SLI(_this, pkt, lpkt) != 0) { |
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return; |
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} |
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return; |
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case PPTP_CTRL_MES_CODE_CCR: |
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pptp_call_recv_CCR(_this, pkt, lpkt); |
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if (_this->state == PPTP_CALL_STATE_ESTABLISHED) { |
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pptp_call_disconnect(_this, PPTP_CDN_RESULT_REQUEST, |
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PPTP_ERROR_NONE, NULL); |
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} else { |
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pptp_call_disconnect(_this, 0, 0, NULL); |
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if (_this->state != PPTP_CALL_STATE_CLEANUP_WAIT) |
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goto bad_state; |
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} |
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return; |
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default: |
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pptp_call_log(_this, LOG_WARNING, |
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"Unhandled control message type=%s(%d)", |
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pptp_ctrl_mes_type_string(mes_type), mes_type); |
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} |
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return; |
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bad_state: |
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pptp_call_log(_this, LOG_WARNING, |
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"Received control message %s(%d) in bad state=%s", |
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pptp_ctrl_mes_type_string(mes_type), mes_type, |
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pptp_call_state_string(_this->state)); |
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} |
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247 |
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/* receive Set-Link-Info */ |
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/* XXX: this implementation is only supporting "Sync-Frame", |
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* ACCM (Asynchronous Control Character Map) will be discarded */ |
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static int |
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pptp_call_recv_SLI(pptp_call *_this, u_char *pkt, int lpkt) |
252 |
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{ |
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struct pptp_sli *sli; |
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255 |
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if (lpkt < sizeof(struct pptp_sli)) { |
256 |
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pptp_call_log(_this, LOG_ERR, "Received bad SLI: packet too " |
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"short: %d < %d", lpkt, (int)sizeof(struct pptp_sli)); |
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return 1; |
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} |
260 |
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sli = (struct pptp_sli *)pkt; |
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sli->send_accm = ntohl(sli->send_accm); |
262 |
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sli->recv_accm = ntohl(sli->recv_accm); |
263 |
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if (sli->send_accm != 0xffffffffL || |
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sli->recv_accm != 0xffffffffL) { |
265 |
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pptp_call_log(_this, LOG_WARNING, |
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"RecvSLI Received bad ACCM %08x:%08x: asynchronous framing " |
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"is not supported.\n", sli->send_accm, sli->recv_accm); |
268 |
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return 1; |
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} |
270 |
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pptp_call_log(_this, LOG_INFO, "RecvSLI accm=%08x:%08x", |
271 |
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sli->send_accm, sli->recv_accm); |
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273 |
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return 0; |
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} |
275 |
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276 |
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#if 0 |
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/* Some route implementation which has "PPTP pass-through" function |
278 |
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* will discard 1723/tcp packet between PAC and PNS, when it recognize |
279 |
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* SLI from PAC. (for example, FLASHWAVE by Fujitsu). |
280 |
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* |
281 |
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* To avoid avobe situation, npppd send well-known SLI only. |
282 |
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*/ |
283 |
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static int |
284 |
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pptp_call_send_SLI(pptp_call *_this) |
285 |
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{ |
286 |
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int lpkt; |
287 |
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struct pptp_sli *sli; |
288 |
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289 |
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sli = bytebuffer_pointer(_this->ctrl->send_buf); |
290 |
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lpkt = bytebuffer_remaining(_this->ctrl->send_buf); |
291 |
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if (lpkt < sizeof(struct pptp_sli)) { |
292 |
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pptp_call_log(_this, LOG_ERR, |
293 |
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"SendOCRP failed: No buffer space available"); |
294 |
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return -1; |
295 |
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} |
296 |
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memset(sli, 0, sizeof(struct pptp_sli)); |
297 |
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298 |
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pptp_init_header(&sli->header, sizeof(struct pptp_sli), |
299 |
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PPTP_CTRL_MES_CODE_SLI); |
300 |
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301 |
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sli->peers_call_id = _this->id; |
302 |
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sli->send_accm = 0xffffffff; |
303 |
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sli->recv_accm = 0xffffffff; |
304 |
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305 |
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_this->last_io = get_monosec(); |
306 |
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pptp_call_log(_this, LOG_INFO, "SendSLI accm=%08x:%08x", |
307 |
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sli->send_accm, sli->recv_accm); |
308 |
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sli->peers_call_id = htons(sli->peers_call_id); |
309 |
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sli->send_accm = htonl(sli->send_accm); |
310 |
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sli->recv_accm = htonl(sli->recv_accm); |
311 |
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pptp_ctrl_output(_this->ctrl, NULL, sizeof(struct pptp_sli)); |
312 |
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313 |
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return 0; |
314 |
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} |
315 |
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#endif |
316 |
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|
317 |
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/* Receive Call-Clear-Request */ |
318 |
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static int |
319 |
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pptp_call_recv_CCR(pptp_call *_this, u_char *pkt, int lpkt) |
320 |
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{ |
321 |
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struct pptp_ccr *ccr; |
322 |
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323 |
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/* check size */ |
324 |
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PPTP_CALL_ASSERT(lpkt >= sizeof(struct pptp_ccr)); |
325 |
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if (lpkt < sizeof(struct pptp_ccr)) { |
326 |
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/* never happen, should KASSERT() here? */ |
327 |
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return 1; |
328 |
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} |
329 |
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ccr = (struct pptp_ccr *)pkt; |
330 |
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331 |
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/* convert byte-order */ |
332 |
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ccr->call_id = ntohs(ccr->call_id); |
333 |
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pptp_call_log(_this, LOG_INFO, "RecvCCR call_id=%u", ccr->call_id); |
334 |
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335 |
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return 0; |
336 |
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} |
337 |
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338 |
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/* Send Call-Disconnect-Notify */ |
339 |
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static void |
340 |
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pptp_call_send_CDN(pptp_call *_this, int result, int error, int cause, |
341 |
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const char *statistics) |
342 |
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{ |
343 |
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int lpkt; |
344 |
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struct pptp_cdn *cdn; |
345 |
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346 |
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cdn = bytebuffer_pointer(_this->ctrl->send_buf); |
347 |
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lpkt = bytebuffer_remaining(_this->ctrl->send_buf); |
348 |
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if (lpkt < sizeof(struct pptp_cdn)) { |
349 |
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pptp_call_log(_this, LOG_ERR, |
350 |
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"SendCCR failed: No buffer space available"); |
351 |
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return; |
352 |
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} |
353 |
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memset(cdn, 0, sizeof(struct pptp_cdn)); |
354 |
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355 |
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pptp_init_header(&cdn->header, sizeof(struct pptp_cdn), |
356 |
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PPTP_CTRL_MES_CODE_CDN); |
357 |
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358 |
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cdn->call_id = _this->id; |
359 |
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cdn->result_code = result; |
360 |
|
|
cdn->error_code = error; |
361 |
|
|
cdn->cause_code = cause; |
362 |
|
|
if (statistics != NULL) |
363 |
|
|
strlcpy(cdn->statistics, statistics, sizeof(cdn->statistics)); |
364 |
|
|
|
365 |
|
|
pptp_call_log(_this, LOG_INFO, "SendCDN " |
366 |
|
|
"call_id=%u result=%s(%d) error=%s(%d) cause=%d statistics=%s", |
367 |
|
|
cdn->call_id, |
368 |
|
|
pptp_CDN_result_string(cdn->result_code), cdn->result_code, |
369 |
|
|
pptp_general_error_string(cdn->error_code), cdn->error_code, |
370 |
|
|
cdn->cause_code, |
371 |
|
|
(statistics == NULL)? "(none)" : (char *)cdn->statistics); |
372 |
|
|
|
373 |
|
|
cdn->call_id = htons(cdn->call_id); |
374 |
|
|
cdn->cause_code = htons(cdn->cause_code); |
375 |
|
|
|
376 |
|
|
_this->last_io = get_monosec(); |
377 |
|
|
pptp_ctrl_output(_this->ctrl, NULL, sizeof(struct pptp_cdn)); |
378 |
|
|
} |
379 |
|
|
|
380 |
|
|
/* Send Outgoing-Call-Reply */ |
381 |
|
|
static int |
382 |
|
|
pptp_call_send_OCRP(pptp_call *_this, int result, int error, int cause) |
383 |
|
|
{ |
384 |
|
|
int lpkt; |
385 |
|
|
struct pptp_ocrp *ocrp; |
386 |
|
|
char logbuf[512]; |
387 |
|
|
|
388 |
|
|
ocrp = bytebuffer_pointer(_this->ctrl->send_buf); |
389 |
|
|
lpkt = bytebuffer_remaining(_this->ctrl->send_buf); |
390 |
|
|
if (lpkt < sizeof(struct pptp_ocrp)) { |
391 |
|
|
pptp_call_log(_this, LOG_ERR, |
392 |
|
|
"SendOCRP failed: No buffer space available"); |
393 |
|
|
return -1; |
394 |
|
|
} |
395 |
|
|
memset(ocrp, 0, sizeof(struct pptp_ocrp)); |
396 |
|
|
|
397 |
|
|
pptp_init_header(&ocrp->header, sizeof(struct pptp_ocrp), |
398 |
|
|
PPTP_CTRL_MES_CODE_OCRP); |
399 |
|
|
|
400 |
|
|
ocrp->call_id = _this->id; |
401 |
|
|
ocrp->peers_call_id = _this->peers_call_id; |
402 |
|
|
ocrp->result_code = result; |
403 |
|
|
ocrp->error_code = error; |
404 |
|
|
ocrp->cause_code = cause; |
405 |
|
|
ocrp->connect_speed = PPTP_CALL_CONNECT_SPEED; |
406 |
|
|
ocrp->recv_winsz = _this->maxwinsz; |
407 |
|
|
ocrp->packet_proccessing_delay = PPTP_CALL_INITIAL_PPD; |
408 |
|
|
ocrp->physical_channel_id = _this->id; |
409 |
|
|
|
410 |
|
|
pptp_call_OCRP_string(ocrp, logbuf, sizeof(logbuf)); |
411 |
|
|
pptp_call_log(_this, LOG_INFO, "SendOCRP %s", logbuf); |
412 |
|
|
|
413 |
|
|
ocrp->call_id = htons(ocrp->call_id); |
414 |
|
|
ocrp->peers_call_id = htons(ocrp->peers_call_id); |
415 |
|
|
ocrp->cause_code = htons(ocrp->cause_code); |
416 |
|
|
ocrp->connect_speed = htons(ocrp->connect_speed); |
417 |
|
|
ocrp->recv_winsz = htons(ocrp->recv_winsz); |
418 |
|
|
ocrp->packet_proccessing_delay = htons(ocrp->packet_proccessing_delay); |
419 |
|
|
ocrp->physical_channel_id = htonl(ocrp->physical_channel_id); |
420 |
|
|
|
421 |
|
|
_this->last_io = get_monosec(); |
422 |
|
|
pptp_ctrl_output(_this->ctrl, NULL, sizeof(struct pptp_ocrp)); |
423 |
|
|
|
424 |
|
|
return 0; |
425 |
|
|
} |
426 |
|
|
|
427 |
|
|
/* Receive Outgoing-Call-Request */ |
428 |
|
|
static int |
429 |
|
|
pptp_call_recv_OCRQ(pptp_call *_this, u_char *pkt, int lpkt) |
430 |
|
|
{ |
431 |
|
|
char logbuf[512]; |
432 |
|
|
struct pptp_ocrq *ocrq; |
433 |
|
|
|
434 |
|
|
/* check size */ |
435 |
|
|
if (lpkt < sizeof(struct pptp_ocrq)) { |
436 |
|
|
pptp_call_log(_this, LOG_ERR, "Received bad OCRQ: packet too " |
437 |
|
|
"short: %d < %d", lpkt, (int)sizeof(struct pptp_ocrq)); |
438 |
|
|
return 1; |
439 |
|
|
} |
440 |
|
|
ocrq = (struct pptp_ocrq *)pkt; |
441 |
|
|
|
442 |
|
|
/* convert byte-order */ |
443 |
|
|
ocrq->call_id = ntohs(ocrq->call_id); |
444 |
|
|
ocrq->call_serial_number = ntohs(ocrq->call_serial_number); |
445 |
|
|
ocrq->recv_winsz = ntohs(ocrq->recv_winsz); |
446 |
|
|
ocrq->packet_proccessing_delay = |
447 |
|
|
ntohs(ocrq->packet_proccessing_delay); |
448 |
|
|
ocrq->phone_number_length = ntohs(ocrq->phone_number_length); |
449 |
|
|
ocrq->reservied1 = ntohs(ocrq->reservied1); |
450 |
|
|
ocrq->maximum_bps = ntohl(ocrq->maximum_bps); |
451 |
|
|
ocrq->minimum_bps = ntohl(ocrq->minimum_bps); |
452 |
|
|
ocrq->bearer_type = ntohl(ocrq->bearer_type); |
453 |
|
|
ocrq->framing_type = ntohl(ocrq->framing_type); |
454 |
|
|
|
455 |
|
|
_this->peers_call_id = ocrq->call_id; |
456 |
|
|
_this->peers_maxwinsz = ocrq->recv_winsz; |
457 |
|
|
|
458 |
|
|
pptp_call_OCRQ_string(ocrq, logbuf, sizeof(logbuf)); |
459 |
|
|
pptp_call_log(_this, LOG_INFO, "RecvOCRQ %s", logbuf); |
460 |
|
|
|
461 |
|
|
return 0; |
462 |
|
|
} |
463 |
|
|
|
464 |
|
|
/* |
465 |
|
|
* GRE I/O |
466 |
|
|
*/ |
467 |
|
|
|
468 |
|
|
/* Reciver packet via GRE */ |
469 |
|
|
void |
470 |
|
|
pptp_call_gre_input(pptp_call *_this, uint32_t seq, uint32_t ack, |
471 |
|
|
int input_flags, u_char *pkt, int pktlen) |
472 |
|
|
{ |
473 |
|
|
int log_prio; |
474 |
|
|
const char *reason; |
475 |
|
|
int delayed = 0; |
476 |
|
|
|
477 |
|
|
PPTP_CALL_ASSERT(_this != NULL); |
478 |
|
|
|
479 |
|
|
log_prio = LOG_INFO; |
480 |
|
|
|
481 |
|
|
#ifdef PPTP_CALL_DEBUG |
482 |
|
|
if (debuglevel >= 2) { |
483 |
|
|
pptp_call_log(_this, LOG_DEBUG, |
484 |
|
|
"Received data packet seq=%u(%u-%u) ack=%u(%u-%u)", |
485 |
|
|
seq, _this->rcv_nxt, |
486 |
|
|
_this->rcv_nxt + _this->peers_maxwinsz - 1, |
487 |
|
|
ack, _this->snd_una, _this->snd_nxt); |
488 |
|
|
} |
489 |
|
|
#endif |
490 |
|
|
if (_this->state != PPTP_CALL_STATE_ESTABLISHED) { |
491 |
|
|
pptp_call_log(_this, LOG_INFO, |
492 |
|
|
"Received data packet in illegal state=%s", |
493 |
|
|
pptp_call_state_string(_this->state)); |
494 |
|
|
return; |
495 |
|
|
} |
496 |
|
|
PPTP_CALL_ASSERT(_this->state == PPTP_CALL_STATE_ESTABLISHED); |
497 |
|
|
|
498 |
|
|
if (input_flags & PPTP_GRE_PKT_ACK_PRESENT) { |
499 |
|
|
if (ack + 1 == _this->snd_una) { |
500 |
|
|
/* nothing to do */ |
501 |
|
|
} else if (SEQ_LT(ack, _this->snd_una)) { |
502 |
|
|
delayed = 1; |
503 |
|
|
} else if (SEQ_GT(ack, _this->snd_nxt)) { |
504 |
|
|
reason = "ack for unknown sequence."; |
505 |
|
|
goto bad_pkt; |
506 |
|
|
} else { |
507 |
|
|
ack++; |
508 |
|
|
_this->snd_una = ack; |
509 |
|
|
} |
510 |
|
|
} |
511 |
|
|
|
512 |
|
|
if ((input_flags & PPTP_GRE_PKT_SEQ_PRESENT) == 0) |
513 |
|
|
return; /* ack only packet */ |
514 |
|
|
|
515 |
|
|
/* check sequence# */ |
516 |
|
|
if (SEQ_LT(seq, _this->rcv_nxt)) { |
517 |
|
|
/* delayed delivery? */ |
518 |
|
|
if (SEQ_LT(seq, _this->rcv_nxt - PPTP_CALL_DELAY_LIMIT)) { |
519 |
|
|
reason = "out of sequence"; |
520 |
|
|
goto bad_pkt; |
521 |
|
|
} |
522 |
|
|
delayed = 1; |
523 |
|
|
} else if (SEQ_GE(seq, _this->rcv_nxt + _this->maxwinsz)){ |
524 |
|
|
/* MUST Process them */ |
525 |
|
|
/* XXX FIXME: if over 4096 packets lost, it can not |
526 |
|
|
* fix MPPE state */ |
527 |
|
|
pptp_call_log(_this, LOG_INFO, |
528 |
|
|
"Received packet caused window overflow. seq=%u(%u-%u), " |
529 |
|
|
"may lost %d packets.", seq, _this->rcv_nxt, |
530 |
|
|
_this->rcv_nxt + _this->maxwinsz - 1, |
531 |
|
|
SEQ_SUB(seq, _this->rcv_nxt)); |
532 |
|
|
} |
533 |
|
|
|
534 |
|
|
if (!delayed) { |
535 |
|
|
seq++; |
536 |
|
|
/* XXX : TODO: should it counts lost packets ppp->ierrors |
537 |
|
|
* and update ppp->ierrors counter? */ |
538 |
|
|
_this->rcv_nxt = seq; |
539 |
|
|
|
540 |
|
|
if (SEQ_SUB(seq, _this->rcv_acked) > RUPDIV(_this->winsz, 2)) { |
541 |
|
|
/* |
542 |
|
|
* Multi-packet acknowledgement. |
543 |
|
|
* send ack when it reachs to half of window size |
544 |
|
|
*/ |
545 |
|
|
PPTP_CALL_DBG((_this, LOG_DEBUG, |
546 |
|
|
"rcv window size=%u %u %u\n", |
547 |
|
|
SEQ_SUB(seq, _this->rcv_acked), seq, |
548 |
|
|
_this->rcv_acked)); |
549 |
|
|
pptp_call_gre_output(_this, 0, 1, NULL, 0); |
550 |
|
|
} |
551 |
|
|
} |
552 |
|
|
|
553 |
|
|
pptp_call_ppp_input(_this, pkt, pktlen, delayed); |
554 |
|
|
|
555 |
|
|
return; |
556 |
|
|
bad_pkt: |
557 |
|
|
pptp_call_log(_this, log_prio, |
558 |
|
|
"Received bad data packet: %s: seq=%u(%u-%u) ack=%u(%u-%u)", |
559 |
|
|
reason, seq, _this->rcv_nxt, _this->rcv_nxt + _this->maxwinsz - 1, |
560 |
|
|
ack, _this->snd_una, _this->snd_nxt); |
561 |
|
|
} |
562 |
|
|
|
563 |
|
|
/* output to GRE */ |
564 |
|
|
/* flags: fseq: contain SEQ field, fack: contain ACK field */ |
565 |
|
|
static int |
566 |
|
|
pptp_call_gre_output(pptp_call *_this, int fseq, int fack, u_char *pkt, |
567 |
|
|
int lpkt) |
568 |
|
|
{ |
569 |
|
|
int sz; |
570 |
|
|
struct pptp_gre_header *grehdr; |
571 |
|
|
u_char buf[65535], *opkt; |
572 |
|
|
struct sockaddr_storage peer, sock; |
573 |
|
|
#ifndef USE_LIBSOCKUTIL |
574 |
|
|
socklen_t peerlen; |
575 |
|
|
#endif |
576 |
|
|
|
577 |
|
|
memset(buf, 0, sizeof(buf)); |
578 |
|
|
|
579 |
|
|
opkt = buf; |
580 |
|
|
grehdr = (struct pptp_gre_header *)opkt; |
581 |
|
|
opkt += sizeof(struct pptp_gre_header); |
582 |
|
|
|
583 |
|
|
/* GRE header */ |
584 |
|
|
grehdr->K = 1; |
585 |
|
|
grehdr->ver = PPTP_GRE_VERSION; |
586 |
|
|
grehdr->protocol_type = htons(PPTP_GRE_PROTOCOL_TYPE); |
587 |
|
|
grehdr->payload_length = htons(lpkt); |
588 |
|
|
grehdr->call_id = htons(_this->peers_call_id); |
589 |
|
|
|
590 |
|
|
#ifdef PPTP_CALL_DEBUG |
591 |
|
|
if (debuglevel >= 2 && (fseq || fack)) { |
592 |
|
|
pptp_call_log(_this, LOG_DEBUG, |
593 |
|
|
"Sending data packet seq=%u ack=%u", |
594 |
|
|
_this->snd_nxt, _this->rcv_nxt - 1); |
595 |
|
|
} |
596 |
|
|
#endif |
597 |
|
|
PPTP_CALL_ASSERT(ALIGNED_POINTER(opkt, uint32_t)); |
598 |
|
|
if (fseq) { |
599 |
|
|
grehdr->S = 1; |
600 |
|
|
*(uint32_t *)opkt = htonl(_this->snd_nxt++); |
601 |
|
|
opkt += 4; |
602 |
|
|
} |
603 |
|
|
if (fack) { |
604 |
|
|
grehdr->A = 1; |
605 |
|
|
_this->rcv_acked = _this->rcv_nxt; |
606 |
|
|
*(uint32_t *)opkt = htonl(_this->rcv_nxt - 1); |
607 |
|
|
opkt += 4; |
608 |
|
|
} |
609 |
|
|
if (lpkt > 0) { |
610 |
|
|
memcpy(opkt, pkt, lpkt); |
611 |
|
|
opkt += lpkt; |
612 |
|
|
} |
613 |
|
|
memcpy(&peer, &_this->ctrl->peer, sizeof(peer)); |
614 |
|
|
memcpy(&sock, &_this->ctrl->our, sizeof(sock)); |
615 |
|
|
switch (peer.ss_family) { |
616 |
|
|
case AF_INET: |
617 |
|
|
((struct sockaddr_in *)&peer)->sin_port = 0; |
618 |
|
|
((struct sockaddr_in *)&sock)->sin_port = 0; |
619 |
|
|
#ifndef USE_LIBSOCKUTIL |
620 |
|
|
peerlen = sizeof(struct sockaddr_in); |
621 |
|
|
#endif |
622 |
|
|
break; |
623 |
|
|
default: |
624 |
|
|
return 1; |
625 |
|
|
} |
626 |
|
|
|
627 |
|
|
if (PPTP_CTRL_CONF(_this->ctrl)->data_out_pktdump != 0) { |
628 |
|
|
pptp_call_log(_this, LOG_DEBUG, "PPTP Data output packet dump"); |
629 |
|
|
show_hd(debug_get_debugfp(), buf, opkt - buf); |
630 |
|
|
} |
631 |
|
|
#ifdef USE_LIBSOCKUTIL |
632 |
|
|
sz = sendfromto(pptp_ctrl_sock_gre(_this->ctrl), buf, opkt - buf, |
633 |
|
|
0, (struct sockaddr *)&sock, (struct sockaddr *)&peer); |
634 |
|
|
#else |
635 |
|
|
sz = sendto(pptp_ctrl_sock_gre(_this->ctrl), buf, opkt - buf, 0, |
636 |
|
|
(struct sockaddr *)&peer, peerlen); |
637 |
|
|
#endif |
638 |
|
|
|
639 |
|
|
if (sz <= 0) |
640 |
|
|
pptp_call_log(_this, LOG_WARNING, "sendto(%d) failed: %m", |
641 |
|
|
pptp_ctrl_sock_gre(_this->ctrl)); |
642 |
|
|
|
643 |
|
|
return (sz > 0)? 0 : 1; |
644 |
|
|
} |
645 |
|
|
|
646 |
|
|
/* |
647 |
|
|
* npppd physical layer functions |
648 |
|
|
*/ |
649 |
|
|
|
650 |
|
|
/* notify to ppp that the PPTP physical layer is already downed */ |
651 |
|
|
static void |
652 |
|
|
pptp_call_notify_down(pptp_call *_this) |
653 |
|
|
{ |
654 |
|
|
if (_this->ppp != NULL) |
655 |
|
|
ppp_phy_downed(_this->ppp); |
656 |
|
|
} |
657 |
|
|
|
658 |
|
|
|
659 |
|
|
/* input packet to ppp */ |
660 |
|
|
static void |
661 |
|
|
pptp_call_ppp_input(pptp_call *_this, u_char *pkt, int pktlen, int delayed) |
662 |
|
|
{ |
663 |
|
|
int rval; |
664 |
|
|
npppd_ppp *ppp; |
665 |
|
|
|
666 |
|
|
ppp = _this->ppp; |
667 |
|
|
if (ppp == NULL) { |
668 |
|
|
pptp_call_log(_this, LOG_WARNING, |
669 |
|
|
"Received ppp frame but ppp is not assigned yet"); |
670 |
|
|
return; |
671 |
|
|
} |
672 |
|
|
rval = ppp->recv_packet(ppp, pkt, pktlen, delayed ? PPP_IO_FLAGS_DELAYED : 0); |
673 |
|
|
if (_this->ppp == NULL) /* ppp is freed */ |
674 |
|
|
return; |
675 |
|
|
|
676 |
|
|
if (rval != 0) { |
677 |
|
|
ppp->ierrors++; |
678 |
|
|
} else { |
679 |
|
|
ppp->ipackets++; |
680 |
|
|
ppp->ibytes += pktlen; |
681 |
|
|
} |
682 |
|
|
} |
683 |
|
|
|
684 |
|
|
/* it called when ppp outputs packet */ |
685 |
|
|
static int |
686 |
|
|
pptp_call_ppp_output(npppd_ppp *ppp, unsigned char *bytes, int nbytes, |
687 |
|
|
int flags) |
688 |
|
|
{ |
689 |
|
|
pptp_call *_this; |
690 |
|
|
|
691 |
|
|
_this = ppp->phy_context; |
692 |
|
|
PPTP_CALL_ASSERT(_this != NULL); |
693 |
|
|
|
694 |
|
|
if (_this == NULL) |
695 |
|
|
return 0; |
696 |
|
|
|
697 |
|
|
if (pptp_call_gre_output(_this, 1, 1, bytes, nbytes) != 0) { |
698 |
|
|
ppp->oerrors++; |
699 |
|
|
return 1; |
700 |
|
|
} |
701 |
|
|
ppp->opackets++; |
702 |
|
|
ppp->obytes += nbytes; |
703 |
|
|
|
704 |
|
|
return 0; |
705 |
|
|
} |
706 |
|
|
|
707 |
|
|
/* it called when pptp call was closed at ppp */ |
708 |
|
|
static void |
709 |
|
|
pptp_call_closed_by_ppp(npppd_ppp *ppp) |
710 |
|
|
{ |
711 |
|
|
pptp_call *_this; |
712 |
|
|
|
713 |
|
|
PPTP_CALL_ASSERT(ppp != NULL); |
714 |
|
|
PPTP_CALL_ASSERT(ppp->phy_context != NULL); |
715 |
|
|
|
716 |
|
|
_this = ppp->phy_context; |
717 |
|
|
|
718 |
|
|
/* do this before pptp_call_disconnect() */ |
719 |
|
|
_this->ppp = NULL; |
720 |
|
|
|
721 |
|
|
if (_this->state != PPTP_CALL_STATE_CLEANUP_WAIT) { |
722 |
|
|
pptp_call_disconnect(_this, PPTP_CDN_RESULT_LOST_CARRIER, 0, |
723 |
|
|
NULL); |
724 |
|
|
} |
725 |
|
|
pptp_call_log(_this, LOG_NOTICE, "logtype=PPPUnbind"); |
726 |
|
|
} |
727 |
|
|
|
728 |
|
|
/* bind() for ppp */ |
729 |
|
|
static int |
730 |
|
|
pptp_call_bind_ppp(pptp_call *_this) |
731 |
|
|
{ |
732 |
|
|
npppd_ppp *ppp; |
733 |
|
|
|
734 |
|
|
ppp = NULL; |
735 |
|
|
if ((ppp = ppp_create()) == NULL) |
736 |
|
|
goto fail; |
737 |
|
|
|
738 |
|
|
PPTP_CALL_ASSERT(_this->ppp == NULL); |
739 |
|
|
|
740 |
|
|
if (_this->ppp != NULL) |
741 |
|
|
return -1; |
742 |
|
|
|
743 |
|
|
_this->ppp = ppp; |
744 |
|
|
|
745 |
|
|
ppp->phy_context = _this; |
746 |
|
|
ppp->tunnel_type = NPPPD_TUNNEL_PPTP; |
747 |
|
|
ppp->tunnel_session_id = _this->id; |
748 |
|
|
ppp->send_packet = pptp_call_ppp_output; |
749 |
|
|
ppp->phy_close = pptp_call_closed_by_ppp; |
750 |
|
|
|
751 |
|
|
strlcpy(ppp->phy_label, PPTP_CTRL_LISTENER_TUN_NAME(_this->ctrl), |
752 |
|
|
sizeof(ppp->phy_label)); |
753 |
|
|
|
754 |
|
|
PPTP_CALL_ASSERT(sizeof(ppp->phy_info) >= _this->ctrl->peer.ss_len); |
755 |
|
|
memcpy(&ppp->phy_info, &_this->ctrl->peer, |
756 |
|
|
MINIMUM(sizeof(ppp->phy_info), _this->ctrl->peer.ss_len)); |
757 |
|
|
|
758 |
|
|
if (ppp_init(npppd_get_npppd(), ppp) != 0) |
759 |
|
|
goto fail; |
760 |
|
|
|
761 |
|
|
pptp_call_log(_this, LOG_NOTICE, "logtype=PPPBind ppp=%d", ppp->id); |
762 |
|
|
ppp_start(ppp); |
763 |
|
|
|
764 |
|
|
return 0; |
765 |
|
|
fail: |
766 |
|
|
pptp_call_log(_this, LOG_ERR, "failed binding ppp"); |
767 |
|
|
|
768 |
|
|
if (ppp != NULL) |
769 |
|
|
ppp_destroy(ppp); |
770 |
|
|
_this->ppp = NULL; |
771 |
|
|
|
772 |
|
|
return 1; |
773 |
|
|
} |
774 |
|
|
|
775 |
|
|
/* |
776 |
|
|
* utility functions |
777 |
|
|
*/ |
778 |
|
|
|
779 |
|
|
/* logging with the label for the instance */ |
780 |
|
|
static void |
781 |
|
|
pptp_call_log(pptp_call *_this, int prio, const char *fmt, ...) |
782 |
|
|
{ |
783 |
|
|
char logbuf[BUFSIZ]; |
784 |
|
|
va_list ap; |
785 |
|
|
|
786 |
|
|
va_start(ap, fmt); |
787 |
|
|
#ifdef PPTPD_MULTIPLE |
788 |
|
|
snprintf(logbuf, sizeof(logbuf), "pptpd id=%u ctrl=%u call=%u %s", |
789 |
|
|
_this->ctrl->pptpd->id, _this->ctrl->id, _this->id, fmt); |
790 |
|
|
#else |
791 |
|
|
snprintf(logbuf, sizeof(logbuf), "pptpd ctrl=%u call=%u %s", |
792 |
|
|
_this->ctrl->id, _this->id, fmt); |
793 |
|
|
#endif |
794 |
|
|
vlog_printf(prio, logbuf, ap); |
795 |
|
|
va_end(ap); |
796 |
|
|
} |
797 |
|
|
|
798 |
|
|
/* convert Outgoing-Call-Request packet to strings */ |
799 |
|
|
static void |
800 |
|
|
pptp_call_OCRQ_string(struct pptp_ocrq *ocrq, char *buf, int lbuf) |
801 |
|
|
{ |
802 |
|
|
snprintf(buf, lbuf, |
803 |
|
|
"call_id=%u call_serial_number=%u max_bps=%u min_bps=%u bearer=%s " |
804 |
|
|
"framing=%s recv_winsz=%u packet_proccessing_delay=%u " |
805 |
|
|
"phone_nunmber=%s subaddress=%s", |
806 |
|
|
ocrq->call_id, ocrq->call_serial_number, ocrq->maximum_bps, |
807 |
|
|
ocrq->minimum_bps, pptp_bearer_string(ocrq->bearer_type), |
808 |
|
|
pptp_framing_string(ocrq->framing_type), ocrq->recv_winsz, |
809 |
|
|
ocrq->packet_proccessing_delay, ocrq->phone_number, |
810 |
|
|
ocrq->subaddress); |
811 |
|
|
} |
812 |
|
|
|
813 |
|
|
/* convert Outgoing-Call-Reply packet to strings */ |
814 |
|
|
void |
815 |
|
|
pptp_call_OCRP_string(struct pptp_ocrp *ocrp, char *buf, int lbuf) |
816 |
|
|
{ |
817 |
|
|
snprintf(buf, lbuf, |
818 |
|
|
"call_id=%u peers_call_id=%u result=%u error=%u cause=%u " |
819 |
|
|
"conn_speed=%u recv_winsz=%u packet_proccessing_delay=%u " |
820 |
|
|
"physical_channel_id=%u", |
821 |
|
|
ocrp->call_id, ocrp->peers_call_id, ocrp->result_code, |
822 |
|
|
ocrp->error_code, ocrp->cause_code, ocrp->connect_speed, |
823 |
|
|
ocrp->recv_winsz, ocrp->packet_proccessing_delay, |
824 |
|
|
ocrp->physical_channel_id); |
825 |
|
|
} |
826 |
|
|
|
827 |
|
|
static char * |
828 |
|
|
pptp_call_state_string(int state) |
829 |
|
|
{ |
830 |
|
|
switch (state) { |
831 |
|
|
case PPTP_CALL_STATE_IDLE: |
832 |
|
|
return "idle"; |
833 |
|
|
case PPTP_CALL_STATE_WAIT_CONN: |
834 |
|
|
return "wait-conn"; |
835 |
|
|
case PPTP_CALL_STATE_ESTABLISHED: |
836 |
|
|
return "established"; |
837 |
|
|
case PPTP_CALL_STATE_CLEANUP_WAIT: |
838 |
|
|
return "cleanup-wait"; |
839 |
|
|
} |
840 |
|
|
return "unknown"; |
841 |
|
|
} |
842 |
|
|
|