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+/*
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ */
+
+#ifndef LWIP_PPP_OPTS_H
+#define LWIP_PPP_OPTS_H
+
+#include "lwip/opt.h"
+
+/**
+ * PPP_SUPPORT==1: Enable PPP.
+ */
+#ifndef PPP_SUPPORT
+#define PPP_SUPPORT 0
+#endif
+
+/**
+ * PPPOE_SUPPORT==1: Enable PPP Over Ethernet
+ */
+#ifndef PPPOE_SUPPORT
+#define PPPOE_SUPPORT 0
+#endif
+
+/**
+ * PPPOL2TP_SUPPORT==1: Enable PPP Over L2TP
+ */
+#ifndef PPPOL2TP_SUPPORT
+#define PPPOL2TP_SUPPORT 0
+#endif
+
+/**
+ * PPPOL2TP_AUTH_SUPPORT==1: Enable PPP Over L2TP Auth (enable MD5 support)
+ */
+#ifndef PPPOL2TP_AUTH_SUPPORT
+#define PPPOL2TP_AUTH_SUPPORT PPPOL2TP_SUPPORT
+#endif
+
+/**
+ * PPPOS_SUPPORT==1: Enable PPP Over Serial
+ */
+#ifndef PPPOS_SUPPORT
+#define PPPOS_SUPPORT PPP_SUPPORT
+#endif
+
+/**
+ * LWIP_PPP_API==1: Enable PPP API (in pppapi.c)
+ */
+#ifndef LWIP_PPP_API
+#define LWIP_PPP_API (PPP_SUPPORT && (NO_SYS == 0))
+#endif
+
+#if PPP_SUPPORT
+
+/**
+ * MEMP_NUM_PPP_PCB: the number of simultaneously active PPP
+ * connections (requires the PPP_SUPPORT option)
+ */
+#ifndef MEMP_NUM_PPP_PCB
+#define MEMP_NUM_PPP_PCB 1
+#endif
+
+/**
+ * PPP_NUM_TIMEOUTS_PER_PCB: the number of sys_timeouts running in parallel per
+ * ppp_pcb. See the detailed explanation at the end of ppp_impl.h about simultaneous
+ * timers analysis.
+ */
+#ifndef PPP_NUM_TIMEOUTS_PER_PCB
+#define PPP_NUM_TIMEOUTS_PER_PCB (1 + PPP_IPV4_SUPPORT + PPP_IPV6_SUPPORT + CCP_SUPPORT)
+#endif
+
+/* The number of sys_timeouts required for the PPP module */
+#define PPP_NUM_TIMEOUTS (PPP_SUPPORT * PPP_NUM_TIMEOUTS_PER_PCB * MEMP_NUM_PPP_PCB)
+
+/**
+ * MEMP_NUM_PPPOS_INTERFACES: the number of concurrently active PPPoS
+ * interfaces (only used with PPPOS_SUPPORT==1)
+ */
+#ifndef MEMP_NUM_PPPOS_INTERFACES
+#define MEMP_NUM_PPPOS_INTERFACES MEMP_NUM_PPP_PCB
+#endif
+
+/**
+ * MEMP_NUM_PPPOE_INTERFACES: the number of concurrently active PPPoE
+ * interfaces (only used with PPPOE_SUPPORT==1)
+ */
+#ifndef MEMP_NUM_PPPOE_INTERFACES
+#define MEMP_NUM_PPPOE_INTERFACES 1
+#endif
+
+/**
+ * MEMP_NUM_PPPOL2TP_INTERFACES: the number of concurrently active PPPoL2TP
+ * interfaces (only used with PPPOL2TP_SUPPORT==1)
+ */
+#ifndef MEMP_NUM_PPPOL2TP_INTERFACES
+#define MEMP_NUM_PPPOL2TP_INTERFACES 1
+#endif
+
+/**
+ * MEMP_NUM_PPP_API_MSG: Number of concurrent PPP API messages (in pppapi.c)
+ */
+#ifndef MEMP_NUM_PPP_API_MSG
+#define MEMP_NUM_PPP_API_MSG 5
+#endif
+
+/**
+ * PPP_DEBUG: Enable debugging for PPP.
+ */
+#ifndef PPP_DEBUG
+#define PPP_DEBUG LWIP_DBG_OFF
+#endif
+
+/**
+ * PPP_INPROC_IRQ_SAFE==1 call pppos_input() using tcpip_callback().
+ *
+ * Please read the "PPPoS input path" chapter in the PPP documentation about this option.
+ */
+#ifndef PPP_INPROC_IRQ_SAFE
+#define PPP_INPROC_IRQ_SAFE 0
+#endif
+
+/**
+ * PRINTPKT_SUPPORT==1: Enable PPP print packet support
+ *
+ * Mandatory for debugging, it displays exchanged packet content in debug trace.
+ */
+#ifndef PRINTPKT_SUPPORT
+#define PRINTPKT_SUPPORT 0
+#endif
+
+/**
+ * PPP_IPV4_SUPPORT==1: Enable PPP IPv4 support
+ */
+#ifndef PPP_IPV4_SUPPORT
+#define PPP_IPV4_SUPPORT (LWIP_IPV4)
+#endif
+
+/**
+ * PPP_IPV6_SUPPORT==1: Enable PPP IPv6 support
+ */
+#ifndef PPP_IPV6_SUPPORT
+#define PPP_IPV6_SUPPORT (LWIP_IPV6)
+#endif
+
+/**
+ * PPP_NOTIFY_PHASE==1: Support PPP notify phase support
+ *
+ * PPP notify phase support allows you to set a callback which is
+ * called on change of the internal PPP state machine.
+ *
+ * This can be used for example to set a LED pattern depending on the
+ * current phase of the PPP session.
+ */
+#ifndef PPP_NOTIFY_PHASE
+#define PPP_NOTIFY_PHASE 0
+#endif
+
+/**
+ * pbuf_type PPP is using for LCP, PAP, CHAP, EAP, CCP, IPCP and IP6CP packets.
+ *
+ * Memory allocated must be single buffered for PPP to works, it requires pbuf
+ * that are not going to be chained when allocated. This requires setting
+ * PBUF_POOL_BUFSIZE to at least 512 bytes, which is quite huge for small systems.
+ *
+ * Setting PPP_USE_PBUF_RAM to 1 makes PPP use memory from heap where continuous
+ * buffers are required, allowing you to use a smaller PBUF_POOL_BUFSIZE.
+ */
+#ifndef PPP_USE_PBUF_RAM
+#define PPP_USE_PBUF_RAM 0
+#endif
+
+/**
+ * PPP_FCS_TABLE: Keep a 256*2 byte table to speed up FCS calculation for PPPoS
+ */
+#ifndef PPP_FCS_TABLE
+#define PPP_FCS_TABLE 1
+#endif
+
+/**
+ * PAP_SUPPORT==1: Support PAP.
+ */
+#ifndef PAP_SUPPORT
+#define PAP_SUPPORT 0
+#endif
+
+/**
+ * CHAP_SUPPORT==1: Support CHAP.
+ */
+#ifndef CHAP_SUPPORT
+#define CHAP_SUPPORT 0
+#endif
+
+/**
+ * MSCHAP_SUPPORT==1: Support MSCHAP.
+ */
+#ifndef MSCHAP_SUPPORT
+#define MSCHAP_SUPPORT 0
+#endif
+#if MSCHAP_SUPPORT
+/* MSCHAP requires CHAP support */
+#undef CHAP_SUPPORT
+#define CHAP_SUPPORT 1
+#endif /* MSCHAP_SUPPORT */
+
+/**
+ * EAP_SUPPORT==1: Support EAP.
+ */
+#ifndef EAP_SUPPORT
+#define EAP_SUPPORT 0
+#endif
+
+/**
+ * CCP_SUPPORT==1: Support CCP.
+ */
+#ifndef CCP_SUPPORT
+#define CCP_SUPPORT 0
+#endif
+
+/**
+ * MPPE_SUPPORT==1: Support MPPE.
+ */
+#ifndef MPPE_SUPPORT
+#define MPPE_SUPPORT 0
+#endif
+#if MPPE_SUPPORT
+/* MPPE requires CCP support */
+#undef CCP_SUPPORT
+#define CCP_SUPPORT 1
+/* MPPE requires MSCHAP support */
+#undef MSCHAP_SUPPORT
+#define MSCHAP_SUPPORT 1
+/* MSCHAP requires CHAP support */
+#undef CHAP_SUPPORT
+#define CHAP_SUPPORT 1
+#endif /* MPPE_SUPPORT */
+
+/**
+ * CBCP_SUPPORT==1: Support CBCP. CURRENTLY NOT SUPPORTED! DO NOT SET!
+ */
+#ifndef CBCP_SUPPORT
+#define CBCP_SUPPORT 0
+#endif
+
+/**
+ * ECP_SUPPORT==1: Support ECP. CURRENTLY NOT SUPPORTED! DO NOT SET!
+ */
+#ifndef ECP_SUPPORT
+#define ECP_SUPPORT 0
+#endif
+
+/**
+ * DEMAND_SUPPORT==1: Support dial on demand. CURRENTLY NOT SUPPORTED! DO NOT SET!
+ */
+#ifndef DEMAND_SUPPORT
+#define DEMAND_SUPPORT 0
+#endif
+
+/**
+ * LQR_SUPPORT==1: Support Link Quality Report. Do nothing except exchanging some LCP packets.
+ */
+#ifndef LQR_SUPPORT
+#define LQR_SUPPORT 0
+#endif
+
+/**
+ * PPP_SERVER==1: Enable PPP server support (waiting for incoming PPP session).
+ *
+ * Currently only supported for PPPoS.
+ */
+#ifndef PPP_SERVER
+#define PPP_SERVER 0
+#endif
+
+#if PPP_SERVER
+/*
+ * PPP_OUR_NAME: Our name for authentication purposes
+ */
+#ifndef PPP_OUR_NAME
+#define PPP_OUR_NAME "lwIP"
+#endif
+#endif /* PPP_SERVER */
+
+/**
+ * VJ_SUPPORT==1: Support VJ header compression.
+ */
+#ifndef VJ_SUPPORT
+#define VJ_SUPPORT 1
+#endif
+/* VJ compression is only supported for TCP over IPv4 over PPPoS. */
+#if !PPPOS_SUPPORT || !PPP_IPV4_SUPPORT || !LWIP_TCP
+#undef VJ_SUPPORT
+#define VJ_SUPPORT 0
+#endif /* !PPPOS_SUPPORT */
+
+/**
+ * PPP_MD5_RANDM==1: Use MD5 for better randomness.
+ * Enabled by default if CHAP, EAP, or L2TP AUTH support is enabled.
+ */
+#ifndef PPP_MD5_RANDM
+#define PPP_MD5_RANDM (CHAP_SUPPORT || EAP_SUPPORT || PPPOL2TP_AUTH_SUPPORT)
+#endif
+
+/**
+ * PolarSSL embedded library
+ *
+ *
+ * lwIP contains some files fetched from the latest BSD release of
+ * the PolarSSL project (PolarSSL 0.10.1-bsd) for ciphers and encryption
+ * methods we need for lwIP PPP support.
+ *
+ * The PolarSSL files were cleaned to contain only the necessary struct
+ * fields and functions needed for lwIP.
+ *
+ * The PolarSSL API was not changed at all, so if you are already using
+ * PolarSSL you can choose to skip the compilation of the included PolarSSL
+ * library into lwIP.
+ *
+ * If you are not using the embedded copy you must include external
+ * libraries into your arch/cc.h port file.
+ *
+ * Beware of the stack requirements which can be a lot larger if you are not
+ * using our cleaned PolarSSL library.
+ */
+
+/**
+ * LWIP_USE_EXTERNAL_POLARSSL: Use external PolarSSL library
+ */
+#ifndef LWIP_USE_EXTERNAL_POLARSSL
+#define LWIP_USE_EXTERNAL_POLARSSL 0
+#endif
+
+/**
+ * LWIP_USE_EXTERNAL_MBEDTLS: Use external mbed TLS library
+ */
+#ifndef LWIP_USE_EXTERNAL_MBEDTLS
+#define LWIP_USE_EXTERNAL_MBEDTLS 0
+#endif
+
+/*
+ * PPP Timeouts
+ */
+
+/**
+ * FSM_DEFTIMEOUT: Timeout time in seconds
+ */
+#ifndef FSM_DEFTIMEOUT
+#define FSM_DEFTIMEOUT 6
+#endif
+
+/**
+ * FSM_DEFMAXTERMREQS: Maximum Terminate-Request transmissions
+ */
+#ifndef FSM_DEFMAXTERMREQS
+#define FSM_DEFMAXTERMREQS 2
+#endif
+
+/**
+ * FSM_DEFMAXCONFREQS: Maximum Configure-Request transmissions
+ */
+#ifndef FSM_DEFMAXCONFREQS
+#define FSM_DEFMAXCONFREQS 10
+#endif
+
+/**
+ * FSM_DEFMAXNAKLOOPS: Maximum number of nak loops
+ */
+#ifndef FSM_DEFMAXNAKLOOPS
+#define FSM_DEFMAXNAKLOOPS 5
+#endif
+
+/**
+ * UPAP_DEFTIMEOUT: Timeout (seconds) for retransmitting req
+ */
+#ifndef UPAP_DEFTIMEOUT
+#define UPAP_DEFTIMEOUT 6
+#endif
+
+/**
+ * UPAP_DEFTRANSMITS: Maximum number of auth-reqs to send
+ */
+#ifndef UPAP_DEFTRANSMITS
+#define UPAP_DEFTRANSMITS 10
+#endif
+
+#if PPP_SERVER
+/**
+ * UPAP_DEFREQTIME: Time to wait for auth-req from peer
+ */
+#ifndef UPAP_DEFREQTIME
+#define UPAP_DEFREQTIME 30
+#endif
+#endif /* PPP_SERVER */
+
+/**
+ * CHAP_DEFTIMEOUT: Timeout (seconds) for retransmitting req
+ */
+#ifndef CHAP_DEFTIMEOUT
+#define CHAP_DEFTIMEOUT 6
+#endif
+
+/**
+ * CHAP_DEFTRANSMITS: max # times to send challenge
+ */
+#ifndef CHAP_DEFTRANSMITS
+#define CHAP_DEFTRANSMITS 10
+#endif
+
+#if PPP_SERVER
+/**
+ * CHAP_DEFRECHALLENGETIME: If this option is > 0, rechallenge the peer every n seconds
+ */
+#ifndef CHAP_DEFRECHALLENGETIME
+#define CHAP_DEFRECHALLENGETIME 0
+#endif
+#endif /* PPP_SERVER */
+
+/**
+ * EAP_DEFREQTIME: Time to wait for peer request
+ */
+#ifndef EAP_DEFREQTIME
+#define EAP_DEFREQTIME 6
+#endif
+
+/**
+ * EAP_DEFALLOWREQ: max # times to accept requests
+ */
+#ifndef EAP_DEFALLOWREQ
+#define EAP_DEFALLOWREQ 10
+#endif
+
+#if PPP_SERVER
+/**
+ * EAP_DEFTIMEOUT: Timeout (seconds) for rexmit
+ */
+#ifndef EAP_DEFTIMEOUT
+#define EAP_DEFTIMEOUT 6
+#endif
+
+/**
+ * EAP_DEFTRANSMITS: max # times to transmit
+ */
+#ifndef EAP_DEFTRANSMITS
+#define EAP_DEFTRANSMITS 10
+#endif
+#endif /* PPP_SERVER */
+
+/**
+ * LCP_DEFLOOPBACKFAIL: Default number of times we receive our magic number from the peer
+ * before deciding the link is looped-back.
+ */
+#ifndef LCP_DEFLOOPBACKFAIL
+#define LCP_DEFLOOPBACKFAIL 10
+#endif
+
+/**
+ * LCP_ECHOINTERVAL: Interval in seconds between keepalive echo requests, 0 to disable.
+ */
+#ifndef LCP_ECHOINTERVAL
+#define LCP_ECHOINTERVAL 0
+#endif
+
+/**
+ * LCP_MAXECHOFAILS: Number of unanswered echo requests before failure.
+ */
+#ifndef LCP_MAXECHOFAILS
+#define LCP_MAXECHOFAILS 3
+#endif
+
+/**
+ * PPP_MAXIDLEFLAG: Max Xmit idle time (in ms) before resend flag char.
+ */
+#ifndef PPP_MAXIDLEFLAG
+#define PPP_MAXIDLEFLAG 100
+#endif
+
+/**
+ * PPP Packet sizes
+ */
+
+/**
+ * PPP_MRU: Default MRU
+ */
+#ifndef PPP_MRU
+#define PPP_MRU 1500
+#endif
+
+/**
+ * PPP_DEFMRU: Default MRU to try
+ */
+#ifndef PPP_DEFMRU
+#define PPP_DEFMRU 1500
+#endif
+
+/**
+ * PPP_MAXMRU: Normally limit MRU to this (pppd default = 16384)
+ */
+#ifndef PPP_MAXMRU
+#define PPP_MAXMRU 1500
+#endif
+
+/**
+ * PPP_MINMRU: No MRUs below this
+ */
+#ifndef PPP_MINMRU
+#define PPP_MINMRU 128
+#endif
+
+/**
+ * PPPOL2TP_DEFMRU: Default MTU and MRU for L2TP
+ * Default = 1500 - PPPoE(6) - PPP Protocol(2) - IPv4 header(20) - UDP Header(8)
+ * - L2TP Header(6) - HDLC Header(2) - PPP Protocol(2) - MPPE Header(2) - PPP Protocol(2)
+ */
+#if PPPOL2TP_SUPPORT
+#ifndef PPPOL2TP_DEFMRU
+#define PPPOL2TP_DEFMRU 1450
+#endif
+#endif /* PPPOL2TP_SUPPORT */
+
+/**
+ * MAXNAMELEN: max length of hostname or name for auth
+ */
+#ifndef MAXNAMELEN
+#define MAXNAMELEN 256
+#endif
+
+/**
+ * MAXSECRETLEN: max length of password or secret
+ */
+#ifndef MAXSECRETLEN
+#define MAXSECRETLEN 256
+#endif
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * Build triggers for embedded PolarSSL
+ */
+#if !LWIP_USE_EXTERNAL_POLARSSL && !LWIP_USE_EXTERNAL_MBEDTLS
+
+/* CHAP, EAP, L2TP AUTH and MD5 Random require MD5 support */
+#if CHAP_SUPPORT || EAP_SUPPORT || PPPOL2TP_AUTH_SUPPORT || PPP_MD5_RANDM
+#define LWIP_INCLUDED_POLARSSL_MD5 1
+#endif /* CHAP_SUPPORT || EAP_SUPPORT || PPPOL2TP_AUTH_SUPPORT || PPP_MD5_RANDM */
+
+#if MSCHAP_SUPPORT
+
+/* MSCHAP require MD4 support */
+#define LWIP_INCLUDED_POLARSSL_MD4 1
+/* MSCHAP require SHA1 support */
+#define LWIP_INCLUDED_POLARSSL_SHA1 1
+/* MSCHAP require DES support */
+#define LWIP_INCLUDED_POLARSSL_DES 1
+
+/* MS-CHAP support is required for MPPE */
+#if MPPE_SUPPORT
+/* MPPE require ARC4 support */
+#define LWIP_INCLUDED_POLARSSL_ARC4 1
+#endif /* MPPE_SUPPORT */
+
+#endif /* MSCHAP_SUPPORT */
+
+#endif /* !LWIP_USE_EXTERNAL_POLARSSL && !LWIP_USE_EXTERNAL_MBEDTLS */
+
+/* Default value if unset */
+#ifndef LWIP_INCLUDED_POLARSSL_MD4
+#define LWIP_INCLUDED_POLARSSL_MD4 0
+#endif /* LWIP_INCLUDED_POLARSSL_MD4 */
+#ifndef LWIP_INCLUDED_POLARSSL_MD5
+#define LWIP_INCLUDED_POLARSSL_MD5 0
+#endif /* LWIP_INCLUDED_POLARSSL_MD5 */
+#ifndef LWIP_INCLUDED_POLARSSL_SHA1
+#define LWIP_INCLUDED_POLARSSL_SHA1 0
+#endif /* LWIP_INCLUDED_POLARSSL_SHA1 */
+#ifndef LWIP_INCLUDED_POLARSSL_DES
+#define LWIP_INCLUDED_POLARSSL_DES 0
+#endif /* LWIP_INCLUDED_POLARSSL_DES */
+#ifndef LWIP_INCLUDED_POLARSSL_ARC4
+#define LWIP_INCLUDED_POLARSSL_ARC4 0
+#endif /* LWIP_INCLUDED_POLARSSL_ARC4 */
+
+#endif /* PPP_SUPPORT */
+
+/* Default value if unset */
+#ifndef PPP_NUM_TIMEOUTS
+#define PPP_NUM_TIMEOUTS 0
+#endif /* PPP_NUM_TIMEOUTS */
+
+#endif /* LWIP_PPP_OPTS_H */