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diff --git a/lwip/src/netif/ppp/lcp.c b/lwip/src/netif/ppp/lcp.c
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+/*
+ * lcp.c - PPP Link Control Protocol.
+ *
+ * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
+ *
+ * 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 "Carnegie Mellon University" must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission. For permission or any legal
+ * details, please contact
+ * Office of Technology Transfer
+ * Carnegie Mellon University
+ * 5000 Forbes Avenue
+ * Pittsburgh, PA 15213-3890
+ * (412) 268-4387, fax: (412) 268-7395
+ * tech-transfer@andrew.cmu.edu
+ *
+ * 4. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by Computing Services
+ * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
+ *
+ * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
+ * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
+ * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "netif/ppp/ppp_opts.h"
+#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
+
+/*
+ * @todo:
+ */
+
+#if 0 /* UNUSED */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#endif /* UNUSED */
+
+#include "netif/ppp/ppp_impl.h"
+
+#include "netif/ppp/fsm.h"
+#include "netif/ppp/lcp.h"
+#if CHAP_SUPPORT
+#include "netif/ppp/chap-new.h"
+#endif /* CHAP_SUPPORT */
+#include "netif/ppp/magic.h"
+
+/*
+ * When the link comes up we want to be able to wait for a short while,
+ * or until seeing some input from the peer, before starting to send
+ * configure-requests. We do this by delaying the fsm_lowerup call.
+ */
+/* steal a bit in fsm flags word */
+#define DELAYED_UP 0x80
+
+static void lcp_delayed_up(void *arg);
+
+/*
+ * LCP-related command-line options.
+ */
+#if 0 /* UNUSED */
+int lcp_echo_interval = 0; /* Interval between LCP echo-requests */
+int lcp_echo_fails = 0; /* Tolerance to unanswered echo-requests */
+#endif /* UNUSED */
+
+#if 0 /* UNUSED */
+/* options */
+static u_int lcp_echo_interval = LCP_ECHOINTERVAL; /* Interval between LCP echo-requests */
+static u_int lcp_echo_fails = LCP_MAXECHOFAILS; /* Tolerance to unanswered echo-requests */
+#endif /* UNUSED */
+
+#if 0 /* UNUSED */
+#if PPP_LCP_ADAPTIVE
+bool lcp_echo_adaptive = 0; /* request echo only if the link was idle */
+#endif
+bool lax_recv = 0; /* accept control chars in asyncmap */
+bool noendpoint = 0; /* don't send/accept endpoint discriminator */
+#endif /* UNUSED */
+
+#if PPP_OPTIONS
+static int noopt (char **);
+#endif /* PPP_OPTIONS */
+
+#ifdef HAVE_MULTILINK
+static int setendpoint (char **);
+static void printendpoint (option_t *, void (*)(void *, char *, ...),
+ void *);
+#endif /* HAVE_MULTILINK */
+
+#if PPP_OPTIONS
+static option_t lcp_option_list[] = {
+ /* LCP options */
+ { "-all", o_special_noarg, (void *)noopt,
+ "Don't request/allow any LCP options" },
+
+ { "noaccomp", o_bool, &lcp_wantoptions[0].neg_accompression,
+ "Disable address/control compression",
+ OPT_A2CLR, &lcp_allowoptions[0].neg_accompression },
+ { "-ac", o_bool, &lcp_wantoptions[0].neg_accompression,
+ "Disable address/control compression",
+ OPT_ALIAS | OPT_A2CLR, &lcp_allowoptions[0].neg_accompression },
+
+ { "asyncmap", o_uint32, &lcp_wantoptions[0].asyncmap,
+ "Set asyncmap (for received packets)",
+ OPT_OR, &lcp_wantoptions[0].neg_asyncmap },
+ { "-as", o_uint32, &lcp_wantoptions[0].asyncmap,
+ "Set asyncmap (for received packets)",
+ OPT_ALIAS | OPT_OR, &lcp_wantoptions[0].neg_asyncmap },
+ { "default-asyncmap", o_uint32, &lcp_wantoptions[0].asyncmap,
+ "Disable asyncmap negotiation",
+ OPT_OR | OPT_NOARG | OPT_VAL(~0U) | OPT_A2CLR,
+ &lcp_allowoptions[0].neg_asyncmap },
+ { "-am", o_uint32, &lcp_wantoptions[0].asyncmap,
+ "Disable asyncmap negotiation",
+ OPT_ALIAS | OPT_OR | OPT_NOARG | OPT_VAL(~0U) | OPT_A2CLR,
+ &lcp_allowoptions[0].neg_asyncmap },
+
+ { "nomagic", o_bool, &lcp_wantoptions[0].neg_magicnumber,
+ "Disable magic number negotiation (looped-back line detection)",
+ OPT_A2CLR, &lcp_allowoptions[0].neg_magicnumber },
+ { "-mn", o_bool, &lcp_wantoptions[0].neg_magicnumber,
+ "Disable magic number negotiation (looped-back line detection)",
+ OPT_ALIAS | OPT_A2CLR, &lcp_allowoptions[0].neg_magicnumber },
+
+ { "mru", o_int, &lcp_wantoptions[0].mru,
+ "Set MRU (maximum received packet size) for negotiation",
+ OPT_PRIO, &lcp_wantoptions[0].neg_mru },
+ { "default-mru", o_bool, &lcp_wantoptions[0].neg_mru,
+ "Disable MRU negotiation (use default 1500)",
+ OPT_PRIOSUB | OPT_A2CLR, &lcp_allowoptions[0].neg_mru },
+ { "-mru", o_bool, &lcp_wantoptions[0].neg_mru,
+ "Disable MRU negotiation (use default 1500)",
+ OPT_ALIAS | OPT_PRIOSUB | OPT_A2CLR, &lcp_allowoptions[0].neg_mru },
+
+ { "mtu", o_int, &lcp_allowoptions[0].mru,
+ "Set our MTU", OPT_LIMITS, NULL, MAXMRU, MINMRU },
+
+ { "nopcomp", o_bool, &lcp_wantoptions[0].neg_pcompression,
+ "Disable protocol field compression",
+ OPT_A2CLR, &lcp_allowoptions[0].neg_pcompression },
+ { "-pc", o_bool, &lcp_wantoptions[0].neg_pcompression,
+ "Disable protocol field compression",
+ OPT_ALIAS | OPT_A2CLR, &lcp_allowoptions[0].neg_pcompression },
+
+ { "passive", o_bool, &lcp_wantoptions[0].passive,
+ "Set passive mode", 1 },
+ { "-p", o_bool, &lcp_wantoptions[0].passive,
+ "Set passive mode", OPT_ALIAS | 1 },
+
+ { "silent", o_bool, &lcp_wantoptions[0].silent,
+ "Set silent mode", 1 },
+
+ { "lcp-echo-failure", o_int, &lcp_echo_fails,
+ "Set number of consecutive echo failures to indicate link failure",
+ OPT_PRIO },
+ { "lcp-echo-interval", o_int, &lcp_echo_interval,
+ "Set time in seconds between LCP echo requests", OPT_PRIO },
+#if PPP_LCP_ADAPTIVE
+ { "lcp-echo-adaptive", o_bool, &lcp_echo_adaptive,
+ "Suppress LCP echo requests if traffic was received", 1 },
+#endif
+ { "lcp-restart", o_int, &lcp_fsm[0].timeouttime,
+ "Set time in seconds between LCP retransmissions", OPT_PRIO },
+ { "lcp-max-terminate", o_int, &lcp_fsm[0].maxtermtransmits,
+ "Set maximum number of LCP terminate-request transmissions", OPT_PRIO },
+ { "lcp-max-configure", o_int, &lcp_fsm[0].maxconfreqtransmits,
+ "Set maximum number of LCP configure-request transmissions", OPT_PRIO },
+ { "lcp-max-failure", o_int, &lcp_fsm[0].maxnakloops,
+ "Set limit on number of LCP configure-naks", OPT_PRIO },
+
+ { "receive-all", o_bool, &lax_recv,
+ "Accept all received control characters", 1 },
+
+#ifdef HAVE_MULTILINK
+ { "mrru", o_int, &lcp_wantoptions[0].mrru,
+ "Maximum received packet size for multilink bundle",
+ OPT_PRIO, &lcp_wantoptions[0].neg_mrru },
+
+ { "mpshortseq", o_bool, &lcp_wantoptions[0].neg_ssnhf,
+ "Use short sequence numbers in multilink headers",
+ OPT_PRIO | 1, &lcp_allowoptions[0].neg_ssnhf },
+ { "nompshortseq", o_bool, &lcp_wantoptions[0].neg_ssnhf,
+ "Don't use short sequence numbers in multilink headers",
+ OPT_PRIOSUB | OPT_A2CLR, &lcp_allowoptions[0].neg_ssnhf },
+
+ { "endpoint", o_special, (void *) setendpoint,
+ "Endpoint discriminator for multilink",
+ OPT_PRIO | OPT_A2PRINTER, (void *) printendpoint },
+#endif /* HAVE_MULTILINK */
+
+ { "noendpoint", o_bool, &noendpoint,
+ "Don't send or accept multilink endpoint discriminator", 1 },
+
+ {NULL}
+};
+#endif /* PPP_OPTIONS */
+
+/*
+ * Callbacks for fsm code. (CI = Configuration Information)
+ */
+static void lcp_resetci(fsm *f); /* Reset our CI */
+static int lcp_cilen(fsm *f); /* Return length of our CI */
+static void lcp_addci(fsm *f, u_char *ucp, int *lenp); /* Add our CI to pkt */
+static int lcp_ackci(fsm *f, u_char *p, int len); /* Peer ack'd our CI */
+static int lcp_nakci(fsm *f, u_char *p, int len, int treat_as_reject); /* Peer nak'd our CI */
+static int lcp_rejci(fsm *f, u_char *p, int len); /* Peer rej'd our CI */
+static int lcp_reqci(fsm *f, u_char *inp, int *lenp, int reject_if_disagree); /* Rcv peer CI */
+static void lcp_up(fsm *f); /* We're UP */
+static void lcp_down(fsm *f); /* We're DOWN */
+static void lcp_starting (fsm *); /* We need lower layer up */
+static void lcp_finished (fsm *); /* We need lower layer down */
+static int lcp_extcode(fsm *f, int code, int id, u_char *inp, int len);
+static void lcp_rprotrej(fsm *f, u_char *inp, int len);
+
+/*
+ * routines to send LCP echos to peer
+ */
+
+static void lcp_echo_lowerup(ppp_pcb *pcb);
+static void lcp_echo_lowerdown(ppp_pcb *pcb);
+static void LcpEchoTimeout(void *arg);
+static void lcp_received_echo_reply(fsm *f, int id, u_char *inp, int len);
+static void LcpSendEchoRequest(fsm *f);
+static void LcpLinkFailure(fsm *f);
+static void LcpEchoCheck(fsm *f);
+
+static const fsm_callbacks lcp_callbacks = { /* LCP callback routines */
+ lcp_resetci, /* Reset our Configuration Information */
+ lcp_cilen, /* Length of our Configuration Information */
+ lcp_addci, /* Add our Configuration Information */
+ lcp_ackci, /* ACK our Configuration Information */
+ lcp_nakci, /* NAK our Configuration Information */
+ lcp_rejci, /* Reject our Configuration Information */
+ lcp_reqci, /* Request peer's Configuration Information */
+ lcp_up, /* Called when fsm reaches OPENED state */
+ lcp_down, /* Called when fsm leaves OPENED state */
+ lcp_starting, /* Called when we want the lower layer up */
+ lcp_finished, /* Called when we want the lower layer down */
+ NULL, /* Called when Protocol-Reject received */
+ NULL, /* Retransmission is necessary */
+ lcp_extcode, /* Called to handle LCP-specific codes */
+ "LCP" /* String name of protocol */
+};
+
+/*
+ * Protocol entry points.
+ * Some of these are called directly.
+ */
+
+static void lcp_init(ppp_pcb *pcb);
+static void lcp_input(ppp_pcb *pcb, u_char *p, int len);
+static void lcp_protrej(ppp_pcb *pcb);
+#if PRINTPKT_SUPPORT
+static int lcp_printpkt(const u_char *p, int plen,
+ void (*printer) (void *, const char *, ...), void *arg);
+#endif /* PRINTPKT_SUPPORT */
+
+const struct protent lcp_protent = {
+ PPP_LCP,
+ lcp_init,
+ lcp_input,
+ lcp_protrej,
+ lcp_lowerup,
+ lcp_lowerdown,
+ lcp_open,
+ lcp_close,
+#if PRINTPKT_SUPPORT
+ lcp_printpkt,
+#endif /* PRINTPKT_SUPPORT */
+#if PPP_DATAINPUT
+ NULL,
+#endif /* PPP_DATAINPUT */
+#if PRINTPKT_SUPPORT
+ "LCP",
+ NULL,
+#endif /* PRINTPKT_SUPPORT */
+#if PPP_OPTIONS
+ lcp_option_list,
+ NULL,
+#endif /* PPP_OPTIONS */
+#if DEMAND_SUPPORT
+ NULL,
+ NULL
+#endif /* DEMAND_SUPPORT */
+};
+
+/*
+ * Length of each type of configuration option (in octets)
+ */
+#define CILEN_VOID 2
+#define CILEN_CHAR 3
+#define CILEN_SHORT 4 /* CILEN_VOID + 2 */
+#if CHAP_SUPPORT
+#define CILEN_CHAP 5 /* CILEN_VOID + 2 + 1 */
+#endif /* CHAP_SUPPORT */
+#define CILEN_LONG 6 /* CILEN_VOID + 4 */
+#if LQR_SUPPORT
+#define CILEN_LQR 8 /* CILEN_VOID + 2 + 4 */
+#endif /* LQR_SUPPORT */
+#define CILEN_CBCP 3
+
+#define CODENAME(x) ((x) == CONFACK ? "ACK" : \
+ (x) == CONFNAK ? "NAK" : "REJ")
+
+#if PPP_OPTIONS
+/*
+ * noopt - Disable all options (why?).
+ */
+static int
+noopt(argv)
+ char **argv;
+{
+ BZERO((char *) &lcp_wantoptions[0], sizeof (struct lcp_options));
+ BZERO((char *) &lcp_allowoptions[0], sizeof (struct lcp_options));
+
+ return (1);
+}
+#endif /* PPP_OPTIONS */
+
+#ifdef HAVE_MULTILINK
+static int
+setendpoint(argv)
+ char **argv;
+{
+ if (str_to_epdisc(&lcp_wantoptions[0].endpoint, *argv)) {
+ lcp_wantoptions[0].neg_endpoint = 1;
+ return 1;
+ }
+ option_error("Can't parse '%s' as an endpoint discriminator", *argv);
+ return 0;
+}
+
+static void
+printendpoint(opt, printer, arg)
+ option_t *opt;
+ void (*printer) (void *, char *, ...);
+ void *arg;
+{
+ printer(arg, "%s", epdisc_to_str(&lcp_wantoptions[0].endpoint));
+}
+#endif /* HAVE_MULTILINK */
+
+/*
+ * lcp_init - Initialize LCP.
+ */
+static void lcp_init(ppp_pcb *pcb) {
+ fsm *f = &pcb->lcp_fsm;
+ lcp_options *wo = &pcb->lcp_wantoptions;
+ lcp_options *ao = &pcb->lcp_allowoptions;
+
+ f->pcb = pcb;
+ f->protocol = PPP_LCP;
+ f->callbacks = &lcp_callbacks;
+
+ fsm_init(f);
+
+ BZERO(wo, sizeof(*wo));
+ wo->neg_mru = 1;
+ wo->mru = PPP_DEFMRU;
+ wo->neg_asyncmap = 1;
+ wo->neg_magicnumber = 1;
+ wo->neg_pcompression = 1;
+ wo->neg_accompression = 1;
+
+ BZERO(ao, sizeof(*ao));
+ ao->neg_mru = 1;
+ ao->mru = PPP_MAXMRU;
+ ao->neg_asyncmap = 1;
+#if CHAP_SUPPORT
+ ao->neg_chap = 1;
+ ao->chap_mdtype = CHAP_MDTYPE_SUPPORTED;
+#endif /* CHAP_SUPPORT */
+#if PAP_SUPPORT
+ ao->neg_upap = 1;
+#endif /* PAP_SUPPORT */
+#if EAP_SUPPORT
+ ao->neg_eap = 1;
+#endif /* EAP_SUPPORT */
+ ao->neg_magicnumber = 1;
+ ao->neg_pcompression = 1;
+ ao->neg_accompression = 1;
+ ao->neg_endpoint = 1;
+}
+
+
+/*
+ * lcp_open - LCP is allowed to come up.
+ */
+void lcp_open(ppp_pcb *pcb) {
+ fsm *f = &pcb->lcp_fsm;
+ lcp_options *wo = &pcb->lcp_wantoptions;
+
+ f->flags &= ~(OPT_PASSIVE | OPT_SILENT);
+ if (wo->passive)
+ f->flags |= OPT_PASSIVE;
+ if (wo->silent)
+ f->flags |= OPT_SILENT;
+ fsm_open(f);
+}
+
+
+/*
+ * lcp_close - Take LCP down.
+ */
+void lcp_close(ppp_pcb *pcb, const char *reason) {
+ fsm *f = &pcb->lcp_fsm;
+ int oldstate;
+
+ if (pcb->phase != PPP_PHASE_DEAD
+#ifdef HAVE_MULTILINK
+ && pcb->phase != PPP_PHASE_MASTER
+#endif /* HAVE_MULTILINK */
+ )
+ new_phase(pcb, PPP_PHASE_TERMINATE);
+
+ if (f->flags & DELAYED_UP) {
+ UNTIMEOUT(lcp_delayed_up, f);
+ f->state = PPP_FSM_STOPPED;
+ }
+ oldstate = f->state;
+
+ fsm_close(f, reason);
+ if (oldstate == PPP_FSM_STOPPED && (f->flags & (OPT_PASSIVE|OPT_SILENT|DELAYED_UP))) {
+ /*
+ * This action is not strictly according to the FSM in RFC1548,
+ * but it does mean that the program terminates if you do a
+ * lcp_close() when a connection hasn't been established
+ * because we are in passive/silent mode or because we have
+ * delayed the fsm_lowerup() call and it hasn't happened yet.
+ */
+ f->flags &= ~DELAYED_UP;
+ lcp_finished(f);
+ }
+}
+
+
+/*
+ * lcp_lowerup - The lower layer is up.
+ */
+void lcp_lowerup(ppp_pcb *pcb) {
+ lcp_options *wo = &pcb->lcp_wantoptions;
+ fsm *f = &pcb->lcp_fsm;
+ /*
+ * Don't use A/C or protocol compression on transmission,
+ * but accept A/C and protocol compressed packets
+ * if we are going to ask for A/C and protocol compression.
+ */
+ if (ppp_send_config(pcb, PPP_MRU, 0xffffffff, 0, 0) < 0
+ || ppp_recv_config(pcb, PPP_MRU, (pcb->settings.lax_recv? 0: 0xffffffff),
+ wo->neg_pcompression, wo->neg_accompression) < 0)
+ return;
+ pcb->peer_mru = PPP_MRU;
+
+ if (pcb->settings.listen_time != 0) {
+ f->flags |= DELAYED_UP;
+ TIMEOUTMS(lcp_delayed_up, f, pcb->settings.listen_time);
+ } else
+ fsm_lowerup(f);
+}
+
+
+/*
+ * lcp_lowerdown - The lower layer is down.
+ */
+void lcp_lowerdown(ppp_pcb *pcb) {
+ fsm *f = &pcb->lcp_fsm;
+
+ if (f->flags & DELAYED_UP) {
+ f->flags &= ~DELAYED_UP;
+ UNTIMEOUT(lcp_delayed_up, f);
+ } else
+ fsm_lowerdown(f);
+}
+
+
+/*
+ * lcp_delayed_up - Bring the lower layer up now.
+ */
+static void lcp_delayed_up(void *arg) {
+ fsm *f = (fsm*)arg;
+
+ if (f->flags & DELAYED_UP) {
+ f->flags &= ~DELAYED_UP;
+ fsm_lowerup(f);
+ }
+}
+
+
+/*
+ * lcp_input - Input LCP packet.
+ */
+static void lcp_input(ppp_pcb *pcb, u_char *p, int len) {
+ fsm *f = &pcb->lcp_fsm;
+
+ if (f->flags & DELAYED_UP) {
+ f->flags &= ~DELAYED_UP;
+ UNTIMEOUT(lcp_delayed_up, f);
+ fsm_lowerup(f);
+ }
+ fsm_input(f, p, len);
+}
+
+/*
+ * lcp_extcode - Handle a LCP-specific code.
+ */
+static int lcp_extcode(fsm *f, int code, int id, u_char *inp, int len) {
+ ppp_pcb *pcb = f->pcb;
+ lcp_options *go = &pcb->lcp_gotoptions;
+ u_char *magp;
+
+ switch( code ){
+ case PROTREJ:
+ lcp_rprotrej(f, inp, len);
+ break;
+
+ case ECHOREQ:
+ if (f->state != PPP_FSM_OPENED)
+ break;
+ magp = inp;
+ PUTLONG(go->magicnumber, magp);
+ fsm_sdata(f, ECHOREP, id, inp, len);
+ break;
+
+ case ECHOREP:
+ lcp_received_echo_reply(f, id, inp, len);
+ break;
+
+ case DISCREQ:
+ case IDENTIF:
+ case TIMEREM:
+ break;
+
+ default:
+ return 0;
+ }
+ return 1;
+}
+
+
+/*
+ * lcp_rprotrej - Receive an Protocol-Reject.
+ *
+ * Figure out which protocol is rejected and inform it.
+ */
+static void lcp_rprotrej(fsm *f, u_char *inp, int len) {
+ int i;
+ const struct protent *protp;
+ u_short prot;
+#if PPP_PROTOCOLNAME
+ const char *pname;
+#endif /* PPP_PROTOCOLNAME */
+
+ if (len < 2) {
+ LCPDEBUG(("lcp_rprotrej: Rcvd short Protocol-Reject packet!"));
+ return;
+ }
+
+ GETSHORT(prot, inp);
+
+ /*
+ * Protocol-Reject packets received in any state other than the LCP
+ * OPENED state SHOULD be silently discarded.
+ */
+ if( f->state != PPP_FSM_OPENED ){
+ LCPDEBUG(("Protocol-Reject discarded: LCP in state %d", f->state));
+ return;
+ }
+
+#if PPP_PROTOCOLNAME
+ pname = protocol_name(prot);
+#endif /* PPP_PROTOCOLNAME */
+
+ /*
+ * Upcall the proper Protocol-Reject routine.
+ */
+ for (i = 0; (protp = protocols[i]) != NULL; ++i)
+ if (protp->protocol == prot) {
+#if PPP_PROTOCOLNAME
+ if (pname != NULL)
+ ppp_dbglog("Protocol-Reject for '%s' (0x%x) received", pname,
+ prot);
+ else
+#endif /* PPP_PROTOCOLNAME */
+ ppp_dbglog("Protocol-Reject for 0x%x received", prot);
+ (*protp->protrej)(f->pcb);
+ return;
+ }
+
+#if PPP_PROTOCOLNAME
+ if (pname != NULL)
+ ppp_warn("Protocol-Reject for unsupported protocol '%s' (0x%x)", pname,
+ prot);
+ else
+#endif /* #if PPP_PROTOCOLNAME */
+ ppp_warn("Protocol-Reject for unsupported protocol 0x%x", prot);
+}
+
+
+/*
+ * lcp_protrej - A Protocol-Reject was received.
+ */
+/*ARGSUSED*/
+static void lcp_protrej(ppp_pcb *pcb) {
+ /*
+ * Can't reject LCP!
+ */
+ ppp_error("Received Protocol-Reject for LCP!");
+ fsm_protreject(&pcb->lcp_fsm);
+}
+
+
+/*
+ * lcp_sprotrej - Send a Protocol-Reject for some protocol.
+ */
+void lcp_sprotrej(ppp_pcb *pcb, u_char *p, int len) {
+ fsm *f = &pcb->lcp_fsm;
+ /*
+ * Send back the protocol and the information field of the
+ * rejected packet. We only get here if LCP is in the OPENED state.
+ */
+#if 0
+ p += 2;
+ len -= 2;
+#endif
+
+ fsm_sdata(f, PROTREJ, ++f->id,
+ p, len);
+}
+
+
+/*
+ * lcp_resetci - Reset our CI.
+ */
+static void lcp_resetci(fsm *f) {
+ ppp_pcb *pcb = f->pcb;
+ lcp_options *wo = &pcb->lcp_wantoptions;
+ lcp_options *go = &pcb->lcp_gotoptions;
+ lcp_options *ao = &pcb->lcp_allowoptions;
+
+#if PPP_AUTH_SUPPORT
+
+ /* note: default value is true for allow options */
+ if (pcb->settings.user && pcb->settings.passwd) {
+#if PAP_SUPPORT
+ if (pcb->settings.refuse_pap) {
+ ao->neg_upap = 0;
+ }
+#endif /* PAP_SUPPORT */
+#if CHAP_SUPPORT
+ if (pcb->settings.refuse_chap) {
+ ao->chap_mdtype &= ~MDTYPE_MD5;
+ }
+#if MSCHAP_SUPPORT
+ if (pcb->settings.refuse_mschap) {
+ ao->chap_mdtype &= ~MDTYPE_MICROSOFT;
+ }
+ if (pcb->settings.refuse_mschap_v2) {
+ ao->chap_mdtype &= ~MDTYPE_MICROSOFT_V2;
+ }
+#endif /* MSCHAP_SUPPORT */
+ ao->neg_chap = (ao->chap_mdtype != MDTYPE_NONE);
+#endif /* CHAP_SUPPORT */
+#if EAP_SUPPORT
+ if (pcb->settings.refuse_eap) {
+ ao->neg_eap = 0;
+ }
+#endif /* EAP_SUPPORT */
+
+#if PPP_SERVER
+ /* note: default value is false for wanted options */
+ if (pcb->settings.auth_required) {
+#if PAP_SUPPORT
+ if (!pcb->settings.refuse_pap) {
+ wo->neg_upap = 1;
+ }
+#endif /* PAP_SUPPORT */
+#if CHAP_SUPPORT
+ if (!pcb->settings.refuse_chap) {
+ wo->chap_mdtype |= MDTYPE_MD5;
+ }
+#if MSCHAP_SUPPORT
+ if (!pcb->settings.refuse_mschap) {
+ wo->chap_mdtype |= MDTYPE_MICROSOFT;
+ }
+ if (!pcb->settings.refuse_mschap_v2) {
+ wo->chap_mdtype |= MDTYPE_MICROSOFT_V2;
+ }
+#endif /* MSCHAP_SUPPORT */
+ wo->neg_chap = (wo->chap_mdtype != MDTYPE_NONE);
+#endif /* CHAP_SUPPORT */
+#if EAP_SUPPORT
+ if (!pcb->settings.refuse_eap) {
+ wo->neg_eap = 1;
+ }
+#endif /* EAP_SUPPORT */
+ }
+#endif /* PPP_SERVER */
+
+ } else {
+#if PAP_SUPPORT
+ ao->neg_upap = 0;
+#endif /* PAP_SUPPORT */
+#if CHAP_SUPPORT
+ ao->neg_chap = 0;
+ ao->chap_mdtype = MDTYPE_NONE;
+#endif /* CHAP_SUPPORT */
+#if EAP_SUPPORT
+ ao->neg_eap = 0;
+#endif /* EAP_SUPPORT */
+ }
+
+ PPPDEBUG(LOG_DEBUG, ("ppp: auth protocols:"));
+#if PAP_SUPPORT
+ PPPDEBUG(LOG_DEBUG, (" PAP=%d", ao->neg_upap));
+#endif /* PAP_SUPPORT */
+#if CHAP_SUPPORT
+ PPPDEBUG(LOG_DEBUG, (" CHAP=%d CHAP_MD5=%d", ao->neg_chap, !!(ao->chap_mdtype&MDTYPE_MD5)));
+#if MSCHAP_SUPPORT
+ PPPDEBUG(LOG_DEBUG, (" CHAP_MS=%d CHAP_MS2=%d", !!(ao->chap_mdtype&MDTYPE_MICROSOFT), !!(ao->chap_mdtype&MDTYPE_MICROSOFT_V2)));
+#endif /* MSCHAP_SUPPORT */
+#endif /* CHAP_SUPPORT */
+#if EAP_SUPPORT
+ PPPDEBUG(LOG_DEBUG, (" EAP=%d", ao->neg_eap));
+#endif /* EAP_SUPPORT */
+ PPPDEBUG(LOG_DEBUG, ("\n"));
+
+#endif /* PPP_AUTH_SUPPORT */
+
+ wo->magicnumber = magic();
+ wo->numloops = 0;
+ *go = *wo;
+#ifdef HAVE_MULTILINK
+ if (!multilink) {
+ go->neg_mrru = 0;
+#endif /* HAVE_MULTILINK */
+ go->neg_ssnhf = 0;
+ go->neg_endpoint = 0;
+#ifdef HAVE_MULTILINK
+ }
+#endif /* HAVE_MULTILINK */
+ if (pcb->settings.noendpoint)
+ ao->neg_endpoint = 0;
+ pcb->peer_mru = PPP_MRU;
+#if 0 /* UNUSED */
+ auth_reset(pcb);
+#endif /* UNUSED */
+}
+
+
+/*
+ * lcp_cilen - Return length of our CI.
+ */
+static int lcp_cilen(fsm *f) {
+ ppp_pcb *pcb = f->pcb;
+ lcp_options *go = &pcb->lcp_gotoptions;
+
+#define LENCIVOID(neg) ((neg) ? CILEN_VOID : 0)
+#if CHAP_SUPPORT
+#define LENCICHAP(neg) ((neg) ? CILEN_CHAP : 0)
+#endif /* CHAP_SUPPORT */
+#define LENCISHORT(neg) ((neg) ? CILEN_SHORT : 0)
+#define LENCILONG(neg) ((neg) ? CILEN_LONG : 0)
+#if LQR_SUPPORT
+#define LENCILQR(neg) ((neg) ? CILEN_LQR: 0)
+#endif /* LQR_SUPPORT */
+#define LENCICBCP(neg) ((neg) ? CILEN_CBCP: 0)
+ /*
+ * NB: we only ask for one of CHAP, UPAP, or EAP, even if we will
+ * accept more than one. We prefer EAP first, then CHAP, then
+ * PAP.
+ */
+ return (LENCISHORT(go->neg_mru && go->mru != PPP_DEFMRU) +
+ LENCILONG(go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF) +
+#if EAP_SUPPORT
+ LENCISHORT(go->neg_eap) +
+#endif /* EAP_SUPPORT */
+#if CHAP_SUPPORT /* cannot be improved, embedding a directive within macro arguments is not portable */
+#if EAP_SUPPORT
+ LENCICHAP(!go->neg_eap && go->neg_chap) +
+#endif /* EAP_SUPPORT */
+#if !EAP_SUPPORT
+ LENCICHAP(go->neg_chap) +
+#endif /* !EAP_SUPPORT */
+#endif /* CHAP_SUPPORT */
+#if PAP_SUPPORT /* cannot be improved, embedding a directive within macro arguments is not portable */
+#if EAP_SUPPORT && CHAP_SUPPORT
+ LENCISHORT(!go->neg_eap && !go->neg_chap && go->neg_upap) +
+#endif /* EAP_SUPPORT && CHAP_SUPPORT */
+#if EAP_SUPPORT && !CHAP_SUPPORT
+ LENCISHORT(!go->neg_eap && go->neg_upap) +
+#endif /* EAP_SUPPORT && !CHAP_SUPPORT */
+#if !EAP_SUPPORT && CHAP_SUPPORT
+ LENCISHORT(!go->neg_chap && go->neg_upap) +
+#endif /* !EAP_SUPPORT && CHAP_SUPPORT */
+#if !EAP_SUPPORT && !CHAP_SUPPORT
+ LENCISHORT(go->neg_upap) +
+#endif /* !EAP_SUPPORT && !CHAP_SUPPORT */
+#endif /* PAP_SUPPORT */
+#if LQR_SUPPORT
+ LENCILQR(go->neg_lqr) +
+#endif /* LQR_SUPPORT */
+ LENCICBCP(go->neg_cbcp) +
+ LENCILONG(go->neg_magicnumber) +
+ LENCIVOID(go->neg_pcompression) +
+ LENCIVOID(go->neg_accompression) +
+#ifdef HAVE_MULTILINK
+ LENCISHORT(go->neg_mrru) +
+#endif /* HAVE_MULTILINK */
+ LENCIVOID(go->neg_ssnhf) +
+ (go->neg_endpoint? CILEN_CHAR + go->endpoint.length: 0));
+}
+
+
+/*
+ * lcp_addci - Add our desired CIs to a packet.
+ */
+static void lcp_addci(fsm *f, u_char *ucp, int *lenp) {
+ ppp_pcb *pcb = f->pcb;
+ lcp_options *go = &pcb->lcp_gotoptions;
+ u_char *start_ucp = ucp;
+
+#define ADDCIVOID(opt, neg) \
+ if (neg) { \
+ PUTCHAR(opt, ucp); \
+ PUTCHAR(CILEN_VOID, ucp); \
+ }
+#define ADDCISHORT(opt, neg, val) \
+ if (neg) { \
+ PUTCHAR(opt, ucp); \
+ PUTCHAR(CILEN_SHORT, ucp); \
+ PUTSHORT(val, ucp); \
+ }
+#if CHAP_SUPPORT
+#define ADDCICHAP(opt, neg, val) \
+ if (neg) { \
+ PUTCHAR((opt), ucp); \
+ PUTCHAR(CILEN_CHAP, ucp); \
+ PUTSHORT(PPP_CHAP, ucp); \
+ PUTCHAR((CHAP_DIGEST(val)), ucp); \
+ }
+#endif /* CHAP_SUPPORT */
+#define ADDCILONG(opt, neg, val) \
+ if (neg) { \
+ PUTCHAR(opt, ucp); \
+ PUTCHAR(CILEN_LONG, ucp); \
+ PUTLONG(val, ucp); \
+ }
+#if LQR_SUPPORT
+#define ADDCILQR(opt, neg, val) \
+ if (neg) { \
+ PUTCHAR(opt, ucp); \
+ PUTCHAR(CILEN_LQR, ucp); \
+ PUTSHORT(PPP_LQR, ucp); \
+ PUTLONG(val, ucp); \
+ }
+#endif /* LQR_SUPPORT */
+#define ADDCICHAR(opt, neg, val) \
+ if (neg) { \
+ PUTCHAR(opt, ucp); \
+ PUTCHAR(CILEN_CHAR, ucp); \
+ PUTCHAR(val, ucp); \
+ }
+#define ADDCIENDP(opt, neg, class, val, len) \
+ if (neg) { \
+ int i; \
+ PUTCHAR(opt, ucp); \
+ PUTCHAR(CILEN_CHAR + len, ucp); \
+ PUTCHAR(class, ucp); \
+ for (i = 0; i < len; ++i) \
+ PUTCHAR(val[i], ucp); \
+ }
+
+ ADDCISHORT(CI_MRU, go->neg_mru && go->mru != PPP_DEFMRU, go->mru);
+ ADDCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF,
+ go->asyncmap);
+#if EAP_SUPPORT
+ ADDCISHORT(CI_AUTHTYPE, go->neg_eap, PPP_EAP);
+#endif /* EAP_SUPPORT */
+#if CHAP_SUPPORT /* cannot be improved, embedding a directive within macro arguments is not portable */
+#if EAP_SUPPORT
+ ADDCICHAP(CI_AUTHTYPE, !go->neg_eap && go->neg_chap, go->chap_mdtype);
+#endif /* EAP_SUPPORT */
+#if !EAP_SUPPORT
+ ADDCICHAP(CI_AUTHTYPE, go->neg_chap, go->chap_mdtype);
+#endif /* !EAP_SUPPORT */
+#endif /* CHAP_SUPPORT */
+#if PAP_SUPPORT /* cannot be improved, embedding a directive within macro arguments is not portable */
+#if EAP_SUPPORT && CHAP_SUPPORT
+ ADDCISHORT(CI_AUTHTYPE, !go->neg_eap && !go->neg_chap && go->neg_upap, PPP_PAP);
+#endif /* EAP_SUPPORT && CHAP_SUPPORT */
+#if EAP_SUPPORT && !CHAP_SUPPORT
+ ADDCISHORT(CI_AUTHTYPE, !go->neg_eap && go->neg_upap, PPP_PAP);
+#endif /* EAP_SUPPORT && !CHAP_SUPPORT */
+#if !EAP_SUPPORT && CHAP_SUPPORT
+ ADDCISHORT(CI_AUTHTYPE, !go->neg_chap && go->neg_upap, PPP_PAP);
+#endif /* !EAP_SUPPORT && CHAP_SUPPORT */
+#if !EAP_SUPPORT && !CHAP_SUPPORT
+ ADDCISHORT(CI_AUTHTYPE, go->neg_upap, PPP_PAP);
+#endif /* !EAP_SUPPORT && !CHAP_SUPPORT */
+#endif /* PAP_SUPPORT */
+#if LQR_SUPPORT
+ ADDCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
+#endif /* LQR_SUPPORT */
+ ADDCICHAR(CI_CALLBACK, go->neg_cbcp, CBCP_OPT);
+ ADDCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber);
+ ADDCIVOID(CI_PCOMPRESSION, go->neg_pcompression);
+ ADDCIVOID(CI_ACCOMPRESSION, go->neg_accompression);
+#ifdef HAVE_MULTILINK
+ ADDCISHORT(CI_MRRU, go->neg_mrru, go->mrru);
+#endif
+ ADDCIVOID(CI_SSNHF, go->neg_ssnhf);
+ ADDCIENDP(CI_EPDISC, go->neg_endpoint, go->endpoint.class_,
+ go->endpoint.value, go->endpoint.length);
+
+ if (ucp - start_ucp != *lenp) {
+ /* this should never happen, because peer_mtu should be 1500 */
+ ppp_error("Bug in lcp_addci: wrong length");
+ }
+}
+
+
+/*
+ * lcp_ackci - Ack our CIs.
+ * This should not modify any state if the Ack is bad.
+ *
+ * Returns:
+ * 0 - Ack was bad.
+ * 1 - Ack was good.
+ */
+static int lcp_ackci(fsm *f, u_char *p, int len) {
+ ppp_pcb *pcb = f->pcb;
+ lcp_options *go = &pcb->lcp_gotoptions;
+ u_char cilen, citype, cichar;
+ u_short cishort;
+ u32_t cilong;
+
+ /*
+ * CIs must be in exactly the same order that we sent.
+ * Check packet length and CI length at each step.
+ * If we find any deviations, then this packet is bad.
+ */
+#define ACKCIVOID(opt, neg) \
+ if (neg) { \
+ if ((len -= CILEN_VOID) < 0) \
+ goto bad; \
+ GETCHAR(citype, p); \
+ GETCHAR(cilen, p); \
+ if (cilen != CILEN_VOID || \
+ citype != opt) \
+ goto bad; \
+ }
+#define ACKCISHORT(opt, neg, val) \
+ if (neg) { \
+ if ((len -= CILEN_SHORT) < 0) \
+ goto bad; \
+ GETCHAR(citype, p); \
+ GETCHAR(cilen, p); \
+ if (cilen != CILEN_SHORT || \
+ citype != opt) \
+ goto bad; \
+ GETSHORT(cishort, p); \
+ if (cishort != val) \
+ goto bad; \
+ }
+#define ACKCICHAR(opt, neg, val) \
+ if (neg) { \
+ if ((len -= CILEN_CHAR) < 0) \
+ goto bad; \
+ GETCHAR(citype, p); \
+ GETCHAR(cilen, p); \
+ if (cilen != CILEN_CHAR || \
+ citype != opt) \
+ goto bad; \
+ GETCHAR(cichar, p); \
+ if (cichar != val) \
+ goto bad; \
+ }
+#if CHAP_SUPPORT
+#define ACKCICHAP(opt, neg, val) \
+ if (neg) { \
+ if ((len -= CILEN_CHAP) < 0) \
+ goto bad; \
+ GETCHAR(citype, p); \
+ GETCHAR(cilen, p); \
+ if (cilen != CILEN_CHAP || \
+ citype != (opt)) \
+ goto bad; \
+ GETSHORT(cishort, p); \
+ if (cishort != PPP_CHAP) \
+ goto bad; \
+ GETCHAR(cichar, p); \
+ if (cichar != (CHAP_DIGEST(val))) \
+ goto bad; \
+ }
+#endif /* CHAP_SUPPORT */
+#define ACKCILONG(opt, neg, val) \
+ if (neg) { \
+ if ((len -= CILEN_LONG) < 0) \
+ goto bad; \
+ GETCHAR(citype, p); \
+ GETCHAR(cilen, p); \
+ if (cilen != CILEN_LONG || \
+ citype != opt) \
+ goto bad; \
+ GETLONG(cilong, p); \
+ if (cilong != val) \
+ goto bad; \
+ }
+#if LQR_SUPPORT
+#define ACKCILQR(opt, neg, val) \
+ if (neg) { \
+ if ((len -= CILEN_LQR) < 0) \
+ goto bad; \
+ GETCHAR(citype, p); \
+ GETCHAR(cilen, p); \
+ if (cilen != CILEN_LQR || \
+ citype != opt) \
+ goto bad; \
+ GETSHORT(cishort, p); \
+ if (cishort != PPP_LQR) \
+ goto bad; \
+ GETLONG(cilong, p); \
+ if (cilong != val) \
+ goto bad; \
+ }
+#endif /* LQR_SUPPORT */
+#define ACKCIENDP(opt, neg, class, val, vlen) \
+ if (neg) { \
+ int i; \
+ if ((len -= CILEN_CHAR + vlen) < 0) \
+ goto bad; \
+ GETCHAR(citype, p); \
+ GETCHAR(cilen, p); \
+ if (cilen != CILEN_CHAR + vlen || \
+ citype != opt) \
+ goto bad; \
+ GETCHAR(cichar, p); \
+ if (cichar != class) \
+ goto bad; \
+ for (i = 0; i < vlen; ++i) { \
+ GETCHAR(cichar, p); \
+ if (cichar != val[i]) \
+ goto bad; \
+ } \
+ }
+
+ ACKCISHORT(CI_MRU, go->neg_mru && go->mru != PPP_DEFMRU, go->mru);
+ ACKCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF,
+ go->asyncmap);
+#if EAP_SUPPORT
+ ACKCISHORT(CI_AUTHTYPE, go->neg_eap, PPP_EAP);
+#endif /* EAP_SUPPORT */
+#if CHAP_SUPPORT /* cannot be improved, embedding a directive within macro arguments is not portable */
+#if EAP_SUPPORT
+ ACKCICHAP(CI_AUTHTYPE, !go->neg_eap && go->neg_chap, go->chap_mdtype);
+#endif /* EAP_SUPPORT */
+#if !EAP_SUPPORT
+ ACKCICHAP(CI_AUTHTYPE, go->neg_chap, go->chap_mdtype);
+#endif /* !EAP_SUPPORT */
+#endif /* CHAP_SUPPORT */
+#if PAP_SUPPORT /* cannot be improved, embedding a directive within macro arguments is not portable */
+#if EAP_SUPPORT && CHAP_SUPPORT
+ ACKCISHORT(CI_AUTHTYPE, !go->neg_eap && !go->neg_chap && go->neg_upap, PPP_PAP);
+#endif /* EAP_SUPPORT && CHAP_SUPPORT */
+#if EAP_SUPPORT && !CHAP_SUPPORT
+ ACKCISHORT(CI_AUTHTYPE, !go->neg_eap && go->neg_upap, PPP_PAP);
+#endif /* EAP_SUPPORT && !CHAP_SUPPORT */
+#if !EAP_SUPPORT && CHAP_SUPPORT
+ ACKCISHORT(CI_AUTHTYPE, !go->neg_chap && go->neg_upap, PPP_PAP);
+#endif /* !EAP_SUPPORT && CHAP_SUPPORT */
+#if !EAP_SUPPORT && !CHAP_SUPPORT
+ ACKCISHORT(CI_AUTHTYPE, go->neg_upap, PPP_PAP);
+#endif /* !EAP_SUPPORT && !CHAP_SUPPORT */
+#endif /* PAP_SUPPORT */
+#if LQR_SUPPORT
+ ACKCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period);
+#endif /* LQR_SUPPORT */
+ ACKCICHAR(CI_CALLBACK, go->neg_cbcp, CBCP_OPT);
+ ACKCILONG(CI_MAGICNUMBER, go->neg_magicnumber, go->magicnumber);
+ ACKCIVOID(CI_PCOMPRESSION, go->neg_pcompression);
+ ACKCIVOID(CI_ACCOMPRESSION, go->neg_accompression);
+#ifdef HAVE_MULTILINK
+ ACKCISHORT(CI_MRRU, go->neg_mrru, go->mrru);
+#endif /* HAVE_MULTILINK */
+ ACKCIVOID(CI_SSNHF, go->neg_ssnhf);
+ ACKCIENDP(CI_EPDISC, go->neg_endpoint, go->endpoint.class_,
+ go->endpoint.value, go->endpoint.length);
+
+ /*
+ * If there are any remaining CIs, then this packet is bad.
+ */
+ if (len != 0)
+ goto bad;
+ return (1);
+bad:
+ LCPDEBUG(("lcp_acki: received bad Ack!"));
+ return (0);
+}
+
+
+/*
+ * lcp_nakci - Peer has sent a NAK for some of our CIs.
+ * This should not modify any state if the Nak is bad
+ * or if LCP is in the OPENED state.
+ *
+ * Returns:
+ * 0 - Nak was bad.
+ * 1 - Nak was good.
+ */
+static int lcp_nakci(fsm *f, u_char *p, int len, int treat_as_reject) {
+ ppp_pcb *pcb = f->pcb;
+ lcp_options *go = &pcb->lcp_gotoptions;
+ lcp_options *wo = &pcb->lcp_wantoptions;
+ u_char citype, cichar, *next;
+ u_short cishort;
+ u32_t cilong;
+ lcp_options no; /* options we've seen Naks for */
+ lcp_options try_; /* options to request next time */
+ int looped_back = 0;
+ int cilen;
+
+ BZERO(&no, sizeof(no));
+ try_ = *go;
+
+ /*
+ * Any Nak'd CIs must be in exactly the same order that we sent.
+ * Check packet length and CI length at each step.
+ * If we find any deviations, then this packet is bad.
+ */
+#define NAKCIVOID(opt, neg) \
+ if (go->neg && \
+ len >= CILEN_VOID && \
+ p[1] == CILEN_VOID && \
+ p[0] == opt) { \
+ len -= CILEN_VOID; \
+ INCPTR(CILEN_VOID, p); \
+ no.neg = 1; \
+ try_.neg = 0; \
+ }
+#if CHAP_SUPPORT
+#define NAKCICHAP(opt, neg, code) \
+ if (go->neg && \
+ len >= CILEN_CHAP && \
+ p[1] == CILEN_CHAP && \
+ p[0] == opt) { \
+ len -= CILEN_CHAP; \
+ INCPTR(2, p); \
+ GETSHORT(cishort, p); \
+ GETCHAR(cichar, p); \
+ no.neg = 1; \
+ code \
+ }
+#endif /* CHAP_SUPPORT */
+#define NAKCICHAR(opt, neg, code) \
+ if (go->neg && \
+ len >= CILEN_CHAR && \
+ p[1] == CILEN_CHAR && \
+ p[0] == opt) { \
+ len -= CILEN_CHAR; \
+ INCPTR(2, p); \
+ GETCHAR(cichar, p); \
+ no.neg = 1; \
+ code \
+ }
+#define NAKCISHORT(opt, neg, code) \
+ if (go->neg && \
+ len >= CILEN_SHORT && \
+ p[1] == CILEN_SHORT && \
+ p[0] == opt) { \
+ len -= CILEN_SHORT; \
+ INCPTR(2, p); \
+ GETSHORT(cishort, p); \
+ no.neg = 1; \
+ code \
+ }
+#define NAKCILONG(opt, neg, code) \
+ if (go->neg && \
+ len >= CILEN_LONG && \
+ p[1] == CILEN_LONG && \
+ p[0] == opt) { \
+ len -= CILEN_LONG; \
+ INCPTR(2, p); \
+ GETLONG(cilong, p); \
+ no.neg = 1; \
+ code \
+ }
+#if LQR_SUPPORT
+#define NAKCILQR(opt, neg, code) \
+ if (go->neg && \
+ len >= CILEN_LQR && \
+ p[1] == CILEN_LQR && \
+ p[0] == opt) { \
+ len -= CILEN_LQR; \
+ INCPTR(2, p); \
+ GETSHORT(cishort, p); \
+ GETLONG(cilong, p); \
+ no.neg = 1; \
+ code \
+ }
+#endif /* LQR_SUPPORT */
+#define NAKCIENDP(opt, neg) \
+ if (go->neg && \
+ len >= CILEN_CHAR && \
+ p[0] == opt && \
+ p[1] >= CILEN_CHAR && \
+ p[1] <= len) { \
+ len -= p[1]; \
+ INCPTR(p[1], p); \
+ no.neg = 1; \
+ try_.neg = 0; \
+ }
+
+ /*
+ * NOTE! There must be no assignments to individual fields of *go in
+ * the code below. Any such assignment is a BUG!
+ */
+ /*
+ * We don't care if they want to send us smaller packets than
+ * we want. Therefore, accept any MRU less than what we asked for,
+ * but then ignore the new value when setting the MRU in the kernel.
+ * If they send us a bigger MRU than what we asked, accept it, up to
+ * the limit of the default MRU we'd get if we didn't negotiate.
+ */
+ if (go->neg_mru && go->mru != PPP_DEFMRU) {
+ NAKCISHORT(CI_MRU, neg_mru,
+ if (cishort <= wo->mru || cishort <= PPP_DEFMRU)
+ try_.mru = cishort;
+ );
+ }
+
+ /*
+ * Add any characters they want to our (receive-side) asyncmap.
+ */
+ if (go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF) {
+ NAKCILONG(CI_ASYNCMAP, neg_asyncmap,
+ try_.asyncmap = go->asyncmap | cilong;
+ );
+ }
+
+ /*
+ * If they've nak'd our authentication-protocol, check whether
+ * they are proposing a different protocol, or a different
+ * hash algorithm for CHAP.
+ */
+ if ((0
+#if CHAP_SUPPORT
+ || go->neg_chap
+#endif /* CHAP_SUPPORT */
+#if PAP_SUPPORT
+ || go->neg_upap
+#endif /* PAP_SUPPORT */
+#if EAP_SUPPORT
+ || go->neg_eap
+#endif /* EAP_SUPPORT */
+ )
+ && len >= CILEN_SHORT
+ && p[0] == CI_AUTHTYPE && p[1] >= CILEN_SHORT && p[1] <= len) {
+ cilen = p[1];
+ len -= cilen;
+#if CHAP_SUPPORT
+ no.neg_chap = go->neg_chap;
+#endif /* CHAP_SUPPORT */
+#if PAP_SUPPORT
+ no.neg_upap = go->neg_upap;
+#endif /* PAP_SUPPORT */
+#if EAP_SUPPORT
+ no.neg_eap = go->neg_eap;
+#endif /* EAP_SUPPORT */
+ INCPTR(2, p);
+ GETSHORT(cishort, p);
+
+#if PAP_SUPPORT
+ if (cishort == PPP_PAP && cilen == CILEN_SHORT) {
+#if EAP_SUPPORT
+ /* If we were asking for EAP, then we need to stop that. */
+ if (go->neg_eap)
+ try_.neg_eap = 0;
+ else
+#endif /* EAP_SUPPORT */
+
+#if CHAP_SUPPORT
+ /* If we were asking for CHAP, then we need to stop that. */
+ if (go->neg_chap)
+ try_.neg_chap = 0;
+ else
+#endif /* CHAP_SUPPORT */
+
+ /*
+ * If we weren't asking for CHAP or EAP, then we were asking for
+ * PAP, in which case this Nak is bad.
+ */
+ goto bad;
+ } else
+#endif /* PAP_SUPPORT */
+
+#if CHAP_SUPPORT
+ if (cishort == PPP_CHAP && cilen == CILEN_CHAP) {
+ GETCHAR(cichar, p);
+#if EAP_SUPPORT
+ /* Stop asking for EAP, if we were. */
+ if (go->neg_eap) {
+ try_.neg_eap = 0;
+ /* Try to set up to use their suggestion, if possible */
+ if (CHAP_CANDIGEST(go->chap_mdtype, cichar))
+ try_.chap_mdtype = CHAP_MDTYPE_D(cichar);
+ } else
+#endif /* EAP_SUPPORT */
+ if (go->neg_chap) {
+ /*
+ * We were asking for our preferred algorithm, they must
+ * want something different.
+ */
+ if (cichar != CHAP_DIGEST(go->chap_mdtype)) {
+ if (CHAP_CANDIGEST(go->chap_mdtype, cichar)) {
+ /* Use their suggestion if we support it ... */
+ try_.chap_mdtype = CHAP_MDTYPE_D(cichar);
+ } else {
+ /* ... otherwise, try our next-preferred algorithm. */
+ try_.chap_mdtype &= ~(CHAP_MDTYPE(try_.chap_mdtype));
+ if (try_.chap_mdtype == MDTYPE_NONE) /* out of algos */
+ try_.neg_chap = 0;
+ }
+ } else {
+ /*
+ * Whoops, they Nak'd our algorithm of choice
+ * but then suggested it back to us.
+ */
+ goto bad;
+ }
+ } else {
+ /*
+ * Stop asking for PAP if we were asking for it.
+ */
+#if PAP_SUPPORT
+ try_.neg_upap = 0;
+#endif /* PAP_SUPPORT */
+ }
+
+ } else
+#endif /* CHAP_SUPPORT */
+ {
+
+#if EAP_SUPPORT
+ /*
+ * If we were asking for EAP, and they're Conf-Naking EAP,
+ * well, that's just strange. Nobody should do that.
+ */
+ if (cishort == PPP_EAP && cilen == CILEN_SHORT && go->neg_eap)
+ ppp_dbglog("Unexpected Conf-Nak for EAP");
+
+ /*
+ * We don't recognize what they're suggesting.
+ * Stop asking for what we were asking for.
+ */
+ if (go->neg_eap)
+ try_.neg_eap = 0;
+ else
+#endif /* EAP_SUPPORT */
+
+#if CHAP_SUPPORT
+ if (go->neg_chap)
+ try_.neg_chap = 0;
+ else
+#endif /* CHAP_SUPPORT */
+
+#if PAP_SUPPORT
+ if(1)
+ try_.neg_upap = 0;
+ else
+#endif /* PAP_SUPPORT */
+ {}
+
+ p += cilen - CILEN_SHORT;
+ }
+ }
+
+#if LQR_SUPPORT
+ /*
+ * If they can't cope with our link quality protocol, we'll have
+ * to stop asking for LQR. We haven't got any other protocol.
+ * If they Nak the reporting period, take their value XXX ?
+ */
+ NAKCILQR(CI_QUALITY, neg_lqr,
+ if (cishort != PPP_LQR)
+ try_.neg_lqr = 0;
+ else
+ try_.lqr_period = cilong;
+ );
+#endif /* LQR_SUPPORT */
+
+ /*
+ * Only implementing CBCP...not the rest of the callback options
+ */
+ NAKCICHAR(CI_CALLBACK, neg_cbcp,
+ try_.neg_cbcp = 0;
+ (void)cichar; /* if CHAP support is not compiled, cichar is set but not used, which makes some compilers complaining */
+ );
+
+ /*
+ * Check for a looped-back line.
+ */
+ NAKCILONG(CI_MAGICNUMBER, neg_magicnumber,
+ try_.magicnumber = magic();
+ looped_back = 1;
+ );
+
+ /*
+ * Peer shouldn't send Nak for protocol compression or
+ * address/control compression requests; they should send
+ * a Reject instead. If they send a Nak, treat it as a Reject.
+ */
+ NAKCIVOID(CI_PCOMPRESSION, neg_pcompression);
+ NAKCIVOID(CI_ACCOMPRESSION, neg_accompression);
+
+#ifdef HAVE_MULTILINK
+ /*
+ * Nak for MRRU option - accept their value if it is smaller
+ * than the one we want.
+ */
+ if (go->neg_mrru) {
+ NAKCISHORT(CI_MRRU, neg_mrru,
+ if (treat_as_reject)
+ try_.neg_mrru = 0;
+ else if (cishort <= wo->mrru)
+ try_.mrru = cishort;
+ );
+ }
+#else /* HAVE_MULTILINK */
+ LWIP_UNUSED_ARG(treat_as_reject);
+#endif /* HAVE_MULTILINK */
+
+ /*
+ * Nak for short sequence numbers shouldn't be sent, treat it
+ * like a reject.
+ */
+ NAKCIVOID(CI_SSNHF, neg_ssnhf);
+
+ /*
+ * Nak of the endpoint discriminator option is not permitted,
+ * treat it like a reject.
+ */
+ NAKCIENDP(CI_EPDISC, neg_endpoint);
+
+ /*
+ * There may be remaining CIs, if the peer is requesting negotiation
+ * on an option that we didn't include in our request packet.
+ * If we see an option that we requested, or one we've already seen
+ * in this packet, then this packet is bad.
+ * If we wanted to respond by starting to negotiate on the requested
+ * option(s), we could, but we don't, because except for the
+ * authentication type and quality protocol, if we are not negotiating
+ * an option, it is because we were told not to.
+ * For the authentication type, the Nak from the peer means
+ * `let me authenticate myself with you' which is a bit pointless.
+ * For the quality protocol, the Nak means `ask me to send you quality
+ * reports', but if we didn't ask for them, we don't want them.
+ * An option we don't recognize represents the peer asking to
+ * negotiate some option we don't support, so ignore it.
+ */
+ while (len >= CILEN_VOID) {
+ GETCHAR(citype, p);
+ GETCHAR(cilen, p);
+ if (cilen < CILEN_VOID || (len -= cilen) < 0)
+ goto bad;
+ next = p + cilen - 2;
+
+ switch (citype) {
+ case CI_MRU:
+ if ((go->neg_mru && go->mru != PPP_DEFMRU)
+ || no.neg_mru || cilen != CILEN_SHORT)
+ goto bad;
+ GETSHORT(cishort, p);
+ if (cishort < PPP_DEFMRU) {
+ try_.neg_mru = 1;
+ try_.mru = cishort;
+ }
+ break;
+ case CI_ASYNCMAP:
+ if ((go->neg_asyncmap && go->asyncmap != 0xFFFFFFFF)
+ || no.neg_asyncmap || cilen != CILEN_LONG)
+ goto bad;
+ break;
+ case CI_AUTHTYPE:
+ if (0
+#if CHAP_SUPPORT
+ || go->neg_chap || no.neg_chap
+#endif /* CHAP_SUPPORT */
+#if PAP_SUPPORT
+ || go->neg_upap || no.neg_upap
+#endif /* PAP_SUPPORT */
+#if EAP_SUPPORT
+ || go->neg_eap || no.neg_eap
+#endif /* EAP_SUPPORT */
+ )
+ goto bad;
+ break;
+ case CI_MAGICNUMBER:
+ if (go->neg_magicnumber || no.neg_magicnumber ||
+ cilen != CILEN_LONG)
+ goto bad;
+ break;
+ case CI_PCOMPRESSION:
+ if (go->neg_pcompression || no.neg_pcompression
+ || cilen != CILEN_VOID)
+ goto bad;
+ break;
+ case CI_ACCOMPRESSION:
+ if (go->neg_accompression || no.neg_accompression
+ || cilen != CILEN_VOID)
+ goto bad;
+ break;
+#if LQR_SUPPORT
+ case CI_QUALITY:
+ if (go->neg_lqr || no.neg_lqr || cilen != CILEN_LQR)
+ goto bad;
+ break;
+#endif /* LQR_SUPPORT */
+#ifdef HAVE_MULTILINK
+ case CI_MRRU:
+ if (go->neg_mrru || no.neg_mrru || cilen != CILEN_SHORT)
+ goto bad;
+ break;
+#endif /* HAVE_MULTILINK */
+ case CI_SSNHF:
+ if (go->neg_ssnhf || no.neg_ssnhf || cilen != CILEN_VOID)
+ goto bad;
+ try_.neg_ssnhf = 1;
+ break;
+ case CI_EPDISC:
+ if (go->neg_endpoint || no.neg_endpoint || cilen < CILEN_CHAR)
+ goto bad;
+ break;
+ default:
+ break;
+ }
+ p = next;
+ }
+
+ /*
+ * OK, the Nak is good. Now we can update state.
+ * If there are any options left we ignore them.
+ */
+ if (f->state != PPP_FSM_OPENED) {
+ if (looped_back) {
+ if (++try_.numloops >= pcb->settings.lcp_loopbackfail) {
+ ppp_notice("Serial line is looped back.");
+ pcb->err_code = PPPERR_LOOPBACK;
+ lcp_close(f->pcb, "Loopback detected");
+ }
+ } else
+ try_.numloops = 0;
+ *go = try_;
+ }
+
+ return 1;
+
+bad:
+ LCPDEBUG(("lcp_nakci: received bad Nak!"));
+ return 0;
+}
+
+
+/*
+ * lcp_rejci - Peer has Rejected some of our CIs.
+ * This should not modify any state if the Reject is bad
+ * or if LCP is in the OPENED state.
+ *
+ * Returns:
+ * 0 - Reject was bad.
+ * 1 - Reject was good.
+ */
+static int lcp_rejci(fsm *f, u_char *p, int len) {
+ ppp_pcb *pcb = f->pcb;
+ lcp_options *go = &pcb->lcp_gotoptions;
+ u_char cichar;
+ u_short cishort;
+ u32_t cilong;
+ lcp_options try_; /* options to request next time */
+
+ try_ = *go;
+
+ /*
+ * Any Rejected CIs must be in exactly the same order that we sent.
+ * Check packet length and CI length at each step.
+ * If we find any deviations, then this packet is bad.
+ */
+#define REJCIVOID(opt, neg) \
+ if (go->neg && \
+ len >= CILEN_VOID && \
+ p[1] == CILEN_VOID && \
+ p[0] == opt) { \
+ len -= CILEN_VOID; \
+ INCPTR(CILEN_VOID, p); \
+ try_.neg = 0; \
+ }
+#define REJCISHORT(opt, neg, val) \
+ if (go->neg && \
+ len >= CILEN_SHORT && \
+ p[1] == CILEN_SHORT && \
+ p[0] == opt) { \
+ len -= CILEN_SHORT; \
+ INCPTR(2, p); \
+ GETSHORT(cishort, p); \
+ /* Check rejected value. */ \
+ if (cishort != val) \
+ goto bad; \
+ try_.neg = 0; \
+ }
+
+#if CHAP_SUPPORT && EAP_SUPPORT && PAP_SUPPORT
+#define REJCICHAP(opt, neg, val) \
+ if (go->neg && \
+ len >= CILEN_CHAP && \
+ p[1] == CILEN_CHAP && \
+ p[0] == opt) { \
+ len -= CILEN_CHAP; \
+ INCPTR(2, p); \
+ GETSHORT(cishort, p); \
+ GETCHAR(cichar, p); \
+ /* Check rejected value. */ \
+ if ((cishort != PPP_CHAP) || (cichar != (CHAP_DIGEST(val)))) \
+ goto bad; \
+ try_.neg = 0; \
+ try_.neg_eap = try_.neg_upap = 0; \
+ }
+#endif /* CHAP_SUPPORT && EAP_SUPPORT && PAP_SUPPORT */
+
+#if CHAP_SUPPORT && !EAP_SUPPORT && PAP_SUPPORT
+#define REJCICHAP(opt, neg, val) \
+ if (go->neg && \
+ len >= CILEN_CHAP && \
+ p[1] == CILEN_CHAP && \
+ p[0] == opt) { \
+ len -= CILEN_CHAP; \
+ INCPTR(2, p); \
+ GETSHORT(cishort, p); \
+ GETCHAR(cichar, p); \
+ /* Check rejected value. */ \
+ if ((cishort != PPP_CHAP) || (cichar != (CHAP_DIGEST(val)))) \
+ goto bad; \
+ try_.neg = 0; \
+ try_.neg_upap = 0; \
+ }
+#endif /* CHAP_SUPPORT && !EAP_SUPPORT && PAP_SUPPORT */
+
+#if CHAP_SUPPORT && EAP_SUPPORT && !PAP_SUPPORT
+#define REJCICHAP(opt, neg, val) \
+ if (go->neg && \
+ len >= CILEN_CHAP && \
+ p[1] == CILEN_CHAP && \
+ p[0] == opt) { \
+ len -= CILEN_CHAP; \
+ INCPTR(2, p); \
+ GETSHORT(cishort, p); \
+ GETCHAR(cichar, p); \
+ /* Check rejected value. */ \
+ if ((cishort != PPP_CHAP) || (cichar != (CHAP_DIGEST(val)))) \
+ goto bad; \
+ try_.neg = 0; \
+ try_.neg_eap = 0; \
+ }
+#endif /* CHAP_SUPPORT && EAP_SUPPORT && !PAP_SUPPORT */
+
+#if CHAP_SUPPORT && !EAP_SUPPORT && !PAP_SUPPORT
+#define REJCICHAP(opt, neg, val) \
+ if (go->neg && \
+ len >= CILEN_CHAP && \
+ p[1] == CILEN_CHAP && \
+ p[0] == opt) { \
+ len -= CILEN_CHAP; \
+ INCPTR(2, p); \
+ GETSHORT(cishort, p); \
+ GETCHAR(cichar, p); \
+ /* Check rejected value. */ \
+ if ((cishort != PPP_CHAP) || (cichar != (CHAP_DIGEST(val)))) \
+ goto bad; \
+ try_.neg = 0; \
+ }
+#endif /* CHAP_SUPPORT && !EAP_SUPPORT && !PAP_SUPPORT */
+
+#define REJCILONG(opt, neg, val) \
+ if (go->neg && \
+ len >= CILEN_LONG && \
+ p[1] == CILEN_LONG && \
+ p[0] == opt) { \
+ len -= CILEN_LONG; \
+ INCPTR(2, p); \
+ GETLONG(cilong, p); \
+ /* Check rejected value. */ \
+ if (cilong != val) \
+ goto bad; \
+ try_.neg = 0; \
+ }
+#if LQR_SUPPORT
+#define REJCILQR(opt, neg, val) \
+ if (go->neg && \
+ len >= CILEN_LQR && \
+ p[1] == CILEN_LQR && \
+ p[0] == opt) { \
+ len -= CILEN_LQR; \
+ INCPTR(2, p); \
+ GETSHORT(cishort, p); \
+ GETLONG(cilong, p); \
+ /* Check rejected value. */ \
+ if (cishort != PPP_LQR || cilong != val) \
+ goto bad; \
+ try_.neg = 0; \
+ }
+#endif /* LQR_SUPPORT */
+#define REJCICBCP(opt, neg, val) \
+ if (go->neg && \
+ len >= CILEN_CBCP && \
+ p[1] == CILEN_CBCP && \
+ p[0] == opt) { \
+ len -= CILEN_CBCP; \
+ INCPTR(2, p); \
+ GETCHAR(cichar, p); \
+ /* Check rejected value. */ \
+ if (cichar != val) \
+ goto bad; \
+ try_.neg = 0; \
+ }
+#define REJCIENDP(opt, neg, class, val, vlen) \
+ if (go->neg && \
+ len >= CILEN_CHAR + vlen && \
+ p[0] == opt && \
+ p[1] == CILEN_CHAR + vlen) { \
+ int i; \
+ len -= CILEN_CHAR + vlen; \
+ INCPTR(2, p); \
+ GETCHAR(cichar, p); \
+ if (cichar != class) \
+ goto bad; \
+ for (i = 0; i < vlen; ++i) { \
+ GETCHAR(cichar, p); \
+ if (cichar != val[i]) \
+ goto bad; \
+ } \
+ try_.neg = 0; \
+ }
+
+ REJCISHORT(CI_MRU, neg_mru, go->mru);
+ REJCILONG(CI_ASYNCMAP, neg_asyncmap, go->asyncmap);
+#if EAP_SUPPORT
+ REJCISHORT(CI_AUTHTYPE, neg_eap, PPP_EAP);
+ if (!go->neg_eap) {
+#endif /* EAP_SUPPORT */
+#if CHAP_SUPPORT
+ REJCICHAP(CI_AUTHTYPE, neg_chap, go->chap_mdtype);
+ if (!go->neg_chap) {
+#endif /* CHAP_SUPPORT */
+#if PAP_SUPPORT
+ REJCISHORT(CI_AUTHTYPE, neg_upap, PPP_PAP);
+#endif /* PAP_SUPPORT */
+#if CHAP_SUPPORT
+ }
+#endif /* CHAP_SUPPORT */
+#if EAP_SUPPORT
+ }
+#endif /* EAP_SUPPORT */
+#if LQR_SUPPORT
+ REJCILQR(CI_QUALITY, neg_lqr, go->lqr_period);
+#endif /* LQR_SUPPORT */
+ REJCICBCP(CI_CALLBACK, neg_cbcp, CBCP_OPT);
+ REJCILONG(CI_MAGICNUMBER, neg_magicnumber, go->magicnumber);
+ REJCIVOID(CI_PCOMPRESSION, neg_pcompression);
+ REJCIVOID(CI_ACCOMPRESSION, neg_accompression);
+#ifdef HAVE_MULTILINK
+ REJCISHORT(CI_MRRU, neg_mrru, go->mrru);
+#endif /* HAVE_MULTILINK */
+ REJCIVOID(CI_SSNHF, neg_ssnhf);
+ REJCIENDP(CI_EPDISC, neg_endpoint, go->endpoint.class_,
+ go->endpoint.value, go->endpoint.length);
+
+ /*
+ * If there are any remaining CIs, then this packet is bad.
+ */
+ if (len != 0)
+ goto bad;
+ /*
+ * Now we can update state.
+ */
+ if (f->state != PPP_FSM_OPENED)
+ *go = try_;
+ return 1;
+
+bad:
+ LCPDEBUG(("lcp_rejci: received bad Reject!"));
+ return 0;
+}
+
+
+/*
+ * lcp_reqci - Check the peer's requested CIs and send appropriate response.
+ *
+ * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
+ * appropriately. If reject_if_disagree is non-zero, doesn't return
+ * CONFNAK; returns CONFREJ if it can't return CONFACK.
+ *
+ * inp = Requested CIs
+ * lenp = Length of requested CIs
+ */
+static int lcp_reqci(fsm *f, u_char *inp, int *lenp, int reject_if_disagree) {
+ ppp_pcb *pcb = f->pcb;
+ lcp_options *go = &pcb->lcp_gotoptions;
+ lcp_options *ho = &pcb->lcp_hisoptions;
+ lcp_options *ao = &pcb->lcp_allowoptions;
+ u_char *cip, *next; /* Pointer to current and next CIs */
+ int cilen, citype, cichar; /* Parsed len, type, char value */
+ u_short cishort; /* Parsed short value */
+ u32_t cilong; /* Parse long value */
+ int rc = CONFACK; /* Final packet return code */
+ int orc; /* Individual option return code */
+ u_char *p; /* Pointer to next char to parse */
+ u_char *rejp; /* Pointer to next char in reject frame */
+ struct pbuf *nakp; /* Nak buffer */
+ u_char *nakoutp; /* Pointer to next char in Nak frame */
+ int l = *lenp; /* Length left */
+
+ /*
+ * Reset all his options.
+ */
+ BZERO(ho, sizeof(*ho));
+
+ /*
+ * Process all his options.
+ */
+ next = inp;
+ nakp = pbuf_alloc(PBUF_RAW, (u16_t)(PPP_CTRL_PBUF_MAX_SIZE), PPP_CTRL_PBUF_TYPE);
+ if(NULL == nakp)
+ return 0;
+ if(nakp->tot_len != nakp->len) {
+ pbuf_free(nakp);
+ return 0;
+ }
+
+ nakoutp = (u_char*)nakp->payload;
+ rejp = inp;
+ while (l) {
+ orc = CONFACK; /* Assume success */
+ cip = p = next; /* Remember begining of CI */
+ if (l < 2 || /* Not enough data for CI header or */
+ p[1] < 2 || /* CI length too small or */
+ p[1] > l) { /* CI length too big? */
+ LCPDEBUG(("lcp_reqci: bad CI length!"));
+ orc = CONFREJ; /* Reject bad CI */
+ cilen = l; /* Reject till end of packet */
+ l = 0; /* Don't loop again */
+ citype = 0;
+ goto endswitch;
+ }
+ GETCHAR(citype, p); /* Parse CI type */
+ GETCHAR(cilen, p); /* Parse CI length */
+ l -= cilen; /* Adjust remaining length */
+ next += cilen; /* Step to next CI */
+
+ switch (citype) { /* Check CI type */
+ case CI_MRU:
+ if (!ao->neg_mru || /* Allow option? */
+ cilen != CILEN_SHORT) { /* Check CI length */
+ orc = CONFREJ; /* Reject CI */
+ break;
+ }
+ GETSHORT(cishort, p); /* Parse MRU */
+
+ /*
+ * He must be able to receive at least our minimum.
+ * No need to check a maximum. If he sends a large number,
+ * we'll just ignore it.
+ */
+ if (cishort < PPP_MINMRU) {
+ orc = CONFNAK; /* Nak CI */
+ PUTCHAR(CI_MRU, nakoutp);
+ PUTCHAR(CILEN_SHORT, nakoutp);
+ PUTSHORT(PPP_MINMRU, nakoutp); /* Give him a hint */
+ break;
+ }
+ ho->neg_mru = 1; /* Remember he sent MRU */
+ ho->mru = cishort; /* And remember value */
+ break;
+
+ case CI_ASYNCMAP:
+ if (!ao->neg_asyncmap ||
+ cilen != CILEN_LONG) {
+ orc = CONFREJ;
+ break;
+ }
+ GETLONG(cilong, p);
+
+ /*
+ * Asyncmap must have set at least the bits
+ * which are set in lcp_allowoptions[unit].asyncmap.
+ */
+ if ((ao->asyncmap & ~cilong) != 0) {
+ orc = CONFNAK;
+ PUTCHAR(CI_ASYNCMAP, nakoutp);
+ PUTCHAR(CILEN_LONG, nakoutp);
+ PUTLONG(ao->asyncmap | cilong, nakoutp);
+ break;
+ }
+ ho->neg_asyncmap = 1;
+ ho->asyncmap = cilong;
+ break;
+
+ case CI_AUTHTYPE:
+ if (cilen < CILEN_SHORT ||
+ !(0
+#if PAP_SUPPORT
+ || ao->neg_upap
+#endif /* PAP_SUPPORT */
+#if CHAP_SUPPORT
+ || ao->neg_chap
+#endif /* CHAP_SUPPORT */
+#if EAP_SUPPORT
+ || ao->neg_eap
+#endif /* EAP_SUPPORT */
+ )) {
+ /*
+ * Reject the option if we're not willing to authenticate.
+ */
+ ppp_dbglog("No auth is possible");
+ orc = CONFREJ;
+ break;
+ }
+ GETSHORT(cishort, p);
+
+ /*
+ * Authtype must be PAP, CHAP, or EAP.
+ *
+ * Note: if more than one of ao->neg_upap, ao->neg_chap, and
+ * ao->neg_eap are set, and the peer sends a Configure-Request
+ * with two or more authenticate-protocol requests, then we will
+ * reject the second request.
+ * Whether we end up doing CHAP, UPAP, or EAP depends then on
+ * the ordering of the CIs in the peer's Configure-Request.
+ */
+
+#if PAP_SUPPORT
+ if (cishort == PPP_PAP) {
+ /* we've already accepted CHAP or EAP */
+ if (0
+#if CHAP_SUPPORT
+ || ho->neg_chap
+#endif /* CHAP_SUPPORT */
+#if EAP_SUPPORT
+ || ho->neg_eap
+#endif /* EAP_SUPPORT */
+ || cilen != CILEN_SHORT) {
+ LCPDEBUG(("lcp_reqci: rcvd AUTHTYPE PAP, rejecting..."));
+ orc = CONFREJ;
+ break;
+ }
+ if (!ao->neg_upap) { /* we don't want to do PAP */
+ orc = CONFNAK; /* NAK it and suggest CHAP or EAP */
+ PUTCHAR(CI_AUTHTYPE, nakoutp);
+#if EAP_SUPPORT
+ if (ao->neg_eap) {
+ PUTCHAR(CILEN_SHORT, nakoutp);
+ PUTSHORT(PPP_EAP, nakoutp);
+ } else {
+#endif /* EAP_SUPPORT */
+#if CHAP_SUPPORT
+ PUTCHAR(CILEN_CHAP, nakoutp);
+ PUTSHORT(PPP_CHAP, nakoutp);
+ PUTCHAR(CHAP_DIGEST(ao->chap_mdtype), nakoutp);
+#endif /* CHAP_SUPPORT */
+#if EAP_SUPPORT
+ }
+#endif /* EAP_SUPPORT */
+ break;
+ }
+ ho->neg_upap = 1;
+ break;
+ }
+#endif /* PAP_SUPPORT */
+#if CHAP_SUPPORT
+ if (cishort == PPP_CHAP) {
+ /* we've already accepted PAP or EAP */
+ if (
+#if PAP_SUPPORT
+ ho->neg_upap ||
+#endif /* PAP_SUPPORT */
+#if EAP_SUPPORT
+ ho->neg_eap ||
+#endif /* EAP_SUPPORT */
+ cilen != CILEN_CHAP) {
+ LCPDEBUG(("lcp_reqci: rcvd AUTHTYPE CHAP, rejecting..."));
+ orc = CONFREJ;
+ break;
+ }
+ if (!ao->neg_chap) { /* we don't want to do CHAP */
+ orc = CONFNAK; /* NAK it and suggest EAP or PAP */
+ PUTCHAR(CI_AUTHTYPE, nakoutp);
+ PUTCHAR(CILEN_SHORT, nakoutp);
+#if EAP_SUPPORT
+ if (ao->neg_eap) {
+ PUTSHORT(PPP_EAP, nakoutp);
+ } else
+#endif /* EAP_SUPPORT */
+#if PAP_SUPPORT
+ if(1) {
+ PUTSHORT(PPP_PAP, nakoutp);
+ }
+ else
+#endif /* PAP_SUPPORT */
+ {}
+ break;
+ }
+ GETCHAR(cichar, p); /* get digest type */
+ if (!(CHAP_CANDIGEST(ao->chap_mdtype, cichar))) {
+ /*
+ * We can't/won't do the requested type,
+ * suggest something else.
+ */
+ orc = CONFNAK;
+ PUTCHAR(CI_AUTHTYPE, nakoutp);
+ PUTCHAR(CILEN_CHAP, nakoutp);
+ PUTSHORT(PPP_CHAP, nakoutp);
+ PUTCHAR(CHAP_DIGEST(ao->chap_mdtype), nakoutp);
+ break;
+ }
+ ho->chap_mdtype = CHAP_MDTYPE_D(cichar); /* save md type */
+ ho->neg_chap = 1;
+ break;
+ }
+#endif /* CHAP_SUPPORT */
+#if EAP_SUPPORT
+ if (cishort == PPP_EAP) {
+ /* we've already accepted CHAP or PAP */
+ if (
+#if CHAP_SUPPORT
+ ho->neg_chap ||
+#endif /* CHAP_SUPPORT */
+#if PAP_SUPPORT
+ ho->neg_upap ||
+#endif /* PAP_SUPPORT */
+ cilen != CILEN_SHORT) {
+ LCPDEBUG(("lcp_reqci: rcvd AUTHTYPE EAP, rejecting..."));
+ orc = CONFREJ;
+ break;
+ }
+ if (!ao->neg_eap) { /* we don't want to do EAP */
+ orc = CONFNAK; /* NAK it and suggest CHAP or PAP */
+ PUTCHAR(CI_AUTHTYPE, nakoutp);
+#if CHAP_SUPPORT
+ if (ao->neg_chap) {
+ PUTCHAR(CILEN_CHAP, nakoutp);
+ PUTSHORT(PPP_CHAP, nakoutp);
+ PUTCHAR(CHAP_DIGEST(ao->chap_mdtype), nakoutp);
+ } else
+#endif /* CHAP_SUPPORT */
+#if PAP_SUPPORT
+ if(1) {
+ PUTCHAR(CILEN_SHORT, nakoutp);
+ PUTSHORT(PPP_PAP, nakoutp);
+ } else
+#endif /* PAP_SUPPORT */
+ {}
+ break;
+ }
+ ho->neg_eap = 1;
+ break;
+ }
+#endif /* EAP_SUPPORT */
+
+ /*
+ * We don't recognize the protocol they're asking for.
+ * Nak it with something we're willing to do.
+ * (At this point we know ao->neg_upap || ao->neg_chap ||
+ * ao->neg_eap.)
+ */
+ orc = CONFNAK;
+ PUTCHAR(CI_AUTHTYPE, nakoutp);
+
+#if EAP_SUPPORT
+ if (ao->neg_eap) {
+ PUTCHAR(CILEN_SHORT, nakoutp);
+ PUTSHORT(PPP_EAP, nakoutp);
+ } else
+#endif /* EAP_SUPPORT */
+#if CHAP_SUPPORT
+ if (ao->neg_chap) {
+ PUTCHAR(CILEN_CHAP, nakoutp);
+ PUTSHORT(PPP_CHAP, nakoutp);
+ PUTCHAR(CHAP_DIGEST(ao->chap_mdtype), nakoutp);
+ } else
+#endif /* CHAP_SUPPORT */
+#if PAP_SUPPORT
+ if(1) {
+ PUTCHAR(CILEN_SHORT, nakoutp);
+ PUTSHORT(PPP_PAP, nakoutp);
+ } else
+#endif /* PAP_SUPPORT */
+ {}
+ break;
+
+#if LQR_SUPPORT
+ case CI_QUALITY:
+ if (!ao->neg_lqr ||
+ cilen != CILEN_LQR) {
+ orc = CONFREJ;
+ break;
+ }
+
+ GETSHORT(cishort, p);
+ GETLONG(cilong, p);
+
+ /*
+ * Check the protocol and the reporting period.
+ * XXX When should we Nak this, and what with?
+ */
+ if (cishort != PPP_LQR) {
+ orc = CONFNAK;
+ PUTCHAR(CI_QUALITY, nakoutp);
+ PUTCHAR(CILEN_LQR, nakoutp);
+ PUTSHORT(PPP_LQR, nakoutp);
+ PUTLONG(ao->lqr_period, nakoutp);
+ break;
+ }
+ break;
+#endif /* LQR_SUPPORT */
+
+ case CI_MAGICNUMBER:
+ if (!(ao->neg_magicnumber || go->neg_magicnumber) ||
+ cilen != CILEN_LONG) {
+ orc = CONFREJ;
+ break;
+ }
+ GETLONG(cilong, p);
+
+ /*
+ * He must have a different magic number.
+ */
+ if (go->neg_magicnumber &&
+ cilong == go->magicnumber) {
+ cilong = magic(); /* Don't put magic() inside macro! */
+ orc = CONFNAK;
+ PUTCHAR(CI_MAGICNUMBER, nakoutp);
+ PUTCHAR(CILEN_LONG, nakoutp);
+ PUTLONG(cilong, nakoutp);
+ break;
+ }
+ ho->neg_magicnumber = 1;
+ ho->magicnumber = cilong;
+ break;
+
+
+ case CI_PCOMPRESSION:
+ if (!ao->neg_pcompression ||
+ cilen != CILEN_VOID) {
+ orc = CONFREJ;
+ break;
+ }
+ ho->neg_pcompression = 1;
+ break;
+
+ case CI_ACCOMPRESSION:
+ if (!ao->neg_accompression ||
+ cilen != CILEN_VOID) {
+ orc = CONFREJ;
+ break;
+ }
+ ho->neg_accompression = 1;
+ break;
+
+#ifdef HAVE_MULTILINK
+ case CI_MRRU:
+ if (!ao->neg_mrru
+ || !multilink
+ || cilen != CILEN_SHORT) {
+ orc = CONFREJ;
+ break;
+ }
+
+ GETSHORT(cishort, p);
+ /* possibly should insist on a minimum/maximum MRRU here */
+ ho->neg_mrru = 1;
+ ho->mrru = cishort;
+ break;
+#endif /* HAVE_MULTILINK */
+
+ case CI_SSNHF:
+ if (!ao->neg_ssnhf
+#ifdef HAVE_MULTILINK
+ || !multilink
+#endif /* HAVE_MULTILINK */
+ || cilen != CILEN_VOID) {
+ orc = CONFREJ;
+ break;
+ }
+ ho->neg_ssnhf = 1;
+ break;
+
+ case CI_EPDISC:
+ if (!ao->neg_endpoint ||
+ cilen < CILEN_CHAR ||
+ cilen > CILEN_CHAR + MAX_ENDP_LEN) {
+ orc = CONFREJ;
+ break;
+ }
+ GETCHAR(cichar, p);
+ cilen -= CILEN_CHAR;
+ ho->neg_endpoint = 1;
+ ho->endpoint.class_ = cichar;
+ ho->endpoint.length = cilen;
+ MEMCPY(ho->endpoint.value, p, cilen);
+ INCPTR(cilen, p);
+ break;
+
+ default:
+ LCPDEBUG(("lcp_reqci: rcvd unknown option %d", citype));
+ orc = CONFREJ;
+ break;
+ }
+
+endswitch:
+ if (orc == CONFACK && /* Good CI */
+ rc != CONFACK) /* but prior CI wasnt? */
+ continue; /* Don't send this one */
+
+ if (orc == CONFNAK) { /* Nak this CI? */
+ if (reject_if_disagree /* Getting fed up with sending NAKs? */
+ && citype != CI_MAGICNUMBER) {
+ orc = CONFREJ; /* Get tough if so */
+ } else {
+ if (rc == CONFREJ) /* Rejecting prior CI? */
+ continue; /* Don't send this one */
+ rc = CONFNAK;
+ }
+ }
+ if (orc == CONFREJ) { /* Reject this CI */
+ rc = CONFREJ;
+ if (cip != rejp) /* Need to move rejected CI? */
+ MEMCPY(rejp, cip, cilen); /* Move it */
+ INCPTR(cilen, rejp); /* Update output pointer */
+ }
+ }
+
+ /*
+ * If we wanted to send additional NAKs (for unsent CIs), the
+ * code would go here. The extra NAKs would go at *nakoutp.
+ * At present there are no cases where we want to ask the
+ * peer to negotiate an option.
+ */
+
+ switch (rc) {
+ case CONFACK:
+ *lenp = next - inp;
+ break;
+ case CONFNAK:
+ /*
+ * Copy the Nak'd options from the nak buffer to the caller's buffer.
+ */
+ *lenp = nakoutp - (u_char*)nakp->payload;
+ MEMCPY(inp, nakp->payload, *lenp);
+ break;
+ case CONFREJ:
+ *lenp = rejp - inp;
+ break;
+ default:
+ break;
+ }
+
+ pbuf_free(nakp);
+ LCPDEBUG(("lcp_reqci: returning CONF%s.", CODENAME(rc)));
+ return (rc); /* Return final code */
+}
+
+
+/*
+ * lcp_up - LCP has come UP.
+ */
+static void lcp_up(fsm *f) {
+ ppp_pcb *pcb = f->pcb;
+ lcp_options *wo = &pcb->lcp_wantoptions;
+ lcp_options *ho = &pcb->lcp_hisoptions;
+ lcp_options *go = &pcb->lcp_gotoptions;
+ lcp_options *ao = &pcb->lcp_allowoptions;
+ int mtu, mru;
+
+ if (!go->neg_magicnumber)
+ go->magicnumber = 0;
+ if (!ho->neg_magicnumber)
+ ho->magicnumber = 0;
+
+ /*
+ * Set our MTU to the smaller of the MTU we wanted and
+ * the MRU our peer wanted. If we negotiated an MRU,
+ * set our MRU to the larger of value we wanted and
+ * the value we got in the negotiation.
+ * Note on the MTU: the link MTU can be the MRU the peer wanted,
+ * the interface MTU is set to the lowest of that, the
+ * MTU we want to use, and our link MRU.
+ */
+ mtu = ho->neg_mru? ho->mru: PPP_MRU;
+ mru = go->neg_mru? LWIP_MAX(wo->mru, go->mru): PPP_MRU;
+#ifdef HAVE_MULTILINK
+ if (!(multilink && go->neg_mrru && ho->neg_mrru))
+#endif /* HAVE_MULTILINK */
+ netif_set_mtu(pcb, LWIP_MIN(LWIP_MIN(mtu, mru), ao->mru));
+ ppp_send_config(pcb, mtu,
+ (ho->neg_asyncmap? ho->asyncmap: 0xffffffff),
+ ho->neg_pcompression, ho->neg_accompression);
+ ppp_recv_config(pcb, mru,
+ (pcb->settings.lax_recv? 0: go->neg_asyncmap? go->asyncmap: 0xffffffff),
+ go->neg_pcompression, go->neg_accompression);
+
+ if (ho->neg_mru)
+ pcb->peer_mru = ho->mru;
+
+ lcp_echo_lowerup(f->pcb); /* Enable echo messages */
+
+ link_established(pcb);
+}
+
+
+/*
+ * lcp_down - LCP has gone DOWN.
+ *
+ * Alert other protocols.
+ */
+static void lcp_down(fsm *f) {
+ ppp_pcb *pcb = f->pcb;
+ lcp_options *go = &pcb->lcp_gotoptions;
+
+ lcp_echo_lowerdown(f->pcb);
+
+ link_down(pcb);
+
+ ppp_send_config(pcb, PPP_MRU, 0xffffffff, 0, 0);
+ ppp_recv_config(pcb, PPP_MRU,
+ (go->neg_asyncmap? go->asyncmap: 0xffffffff),
+ go->neg_pcompression, go->neg_accompression);
+ pcb->peer_mru = PPP_MRU;
+}
+
+
+/*
+ * lcp_starting - LCP needs the lower layer up.
+ */
+static void lcp_starting(fsm *f) {
+ ppp_pcb *pcb = f->pcb;
+ link_required(pcb);
+}
+
+
+/*
+ * lcp_finished - LCP has finished with the lower layer.
+ */
+static void lcp_finished(fsm *f) {
+ ppp_pcb *pcb = f->pcb;
+ link_terminated(pcb);
+}
+
+
+#if PRINTPKT_SUPPORT
+/*
+ * lcp_printpkt - print the contents of an LCP packet.
+ */
+static const char* const lcp_codenames[] = {
+ "ConfReq", "ConfAck", "ConfNak", "ConfRej",
+ "TermReq", "TermAck", "CodeRej", "ProtRej",
+ "EchoReq", "EchoRep", "DiscReq", "Ident",
+ "TimeRem"
+};
+
+static int lcp_printpkt(const u_char *p, int plen,
+ void (*printer) (void *, const char *, ...), void *arg) {
+ int code, id, len, olen, i;
+ const u_char *pstart, *optend;
+ u_short cishort;
+ u32_t cilong;
+
+ if (plen < HEADERLEN)
+ return 0;
+ pstart = p;
+ GETCHAR(code, p);
+ GETCHAR(id, p);
+ GETSHORT(len, p);
+ if (len < HEADERLEN || len > plen)
+ return 0;
+
+ if (code >= 1 && code <= (int)LWIP_ARRAYSIZE(lcp_codenames))
+ printer(arg, " %s", lcp_codenames[code-1]);
+ else
+ printer(arg, " code=0x%x", code);
+ printer(arg, " id=0x%x", id);
+ len -= HEADERLEN;
+ switch (code) {
+ case CONFREQ:
+ case CONFACK:
+ case CONFNAK:
+ case CONFREJ:
+ /* print option list */
+ while (len >= 2) {
+ GETCHAR(code, p);
+ GETCHAR(olen, p);
+ p -= 2;
+ if (olen < 2 || olen > len) {
+ break;
+ }
+ printer(arg, " <");
+ len -= olen;
+ optend = p + olen;
+ switch (code) {
+ case CI_MRU:
+ if (olen == CILEN_SHORT) {
+ p += 2;
+ GETSHORT(cishort, p);
+ printer(arg, "mru %d", cishort);
+ }
+ break;
+ case CI_ASYNCMAP:
+ if (olen == CILEN_LONG) {
+ p += 2;
+ GETLONG(cilong, p);
+ printer(arg, "asyncmap 0x%x", cilong);
+ }
+ break;
+ case CI_AUTHTYPE:
+ if (olen >= CILEN_SHORT) {
+ p += 2;
+ printer(arg, "auth ");
+ GETSHORT(cishort, p);
+ switch (cishort) {
+#if PAP_SUPPORT
+ case PPP_PAP:
+ printer(arg, "pap");
+ break;
+#endif /* PAP_SUPPORT */
+#if CHAP_SUPPORT
+ case PPP_CHAP:
+ printer(arg, "chap");
+ if (p < optend) {
+ switch (*p) {
+ case CHAP_MD5:
+ printer(arg, " MD5");
+ ++p;
+ break;
+#if MSCHAP_SUPPORT
+ case CHAP_MICROSOFT:
+ printer(arg, " MS");
+ ++p;
+ break;
+
+ case CHAP_MICROSOFT_V2:
+ printer(arg, " MS-v2");
+ ++p;
+ break;
+#endif /* MSCHAP_SUPPORT */
+ default:
+ break;
+ }
+ }
+ break;
+#endif /* CHAP_SUPPORT */
+#if EAP_SUPPORT
+ case PPP_EAP:
+ printer(arg, "eap");
+ break;
+#endif /* EAP_SUPPORT */
+ default:
+ printer(arg, "0x%x", cishort);
+ }
+ }
+ break;
+#if LQR_SUPPORT
+ case CI_QUALITY:
+ if (olen >= CILEN_SHORT) {
+ p += 2;
+ printer(arg, "quality ");
+ GETSHORT(cishort, p);
+ switch (cishort) {
+ case PPP_LQR:
+ printer(arg, "lqr");
+ break;
+ default:
+ printer(arg, "0x%x", cishort);
+ }
+ }
+ break;
+#endif /* LQR_SUPPORT */
+ case CI_CALLBACK:
+ if (olen >= CILEN_CHAR) {
+ p += 2;
+ printer(arg, "callback ");
+ GETCHAR(cishort, p);
+ switch (cishort) {
+ case CBCP_OPT:
+ printer(arg, "CBCP");
+ break;
+ default:
+ printer(arg, "0x%x", cishort);
+ }
+ }
+ break;
+ case CI_MAGICNUMBER:
+ if (olen == CILEN_LONG) {
+ p += 2;
+ GETLONG(cilong, p);
+ printer(arg, "magic 0x%x", cilong);
+ }
+ break;
+ case CI_PCOMPRESSION:
+ if (olen == CILEN_VOID) {
+ p += 2;
+ printer(arg, "pcomp");
+ }
+ break;
+ case CI_ACCOMPRESSION:
+ if (olen == CILEN_VOID) {
+ p += 2;
+ printer(arg, "accomp");
+ }
+ break;
+ case CI_MRRU:
+ if (olen == CILEN_SHORT) {
+ p += 2;
+ GETSHORT(cishort, p);
+ printer(arg, "mrru %d", cishort);
+ }
+ break;
+ case CI_SSNHF:
+ if (olen == CILEN_VOID) {
+ p += 2;
+ printer(arg, "ssnhf");
+ }
+ break;
+ case CI_EPDISC:
+#ifdef HAVE_MULTILINK
+ if (olen >= CILEN_CHAR) {
+ struct epdisc epd;
+ p += 2;
+ GETCHAR(epd.class, p);
+ epd.length = olen - CILEN_CHAR;
+ if (epd.length > MAX_ENDP_LEN)
+ epd.length = MAX_ENDP_LEN;
+ if (epd.length > 0) {
+ MEMCPY(epd.value, p, epd.length);
+ p += epd.length;
+ }
+ printer(arg, "endpoint [%s]", epdisc_to_str(&epd));
+ }
+#else
+ printer(arg, "endpoint");
+#endif
+ break;
+ default:
+ break;
+ }
+ while (p < optend) {
+ GETCHAR(code, p);
+ printer(arg, " %.2x", code);
+ }
+ printer(arg, ">");
+ }
+ break;
+
+ case TERMACK:
+ case TERMREQ:
+ if (len > 0 && *p >= ' ' && *p < 0x7f) {
+ printer(arg, " ");
+ ppp_print_string(p, len, printer, arg);
+ p += len;
+ len = 0;
+ }
+ break;
+
+ case ECHOREQ:
+ case ECHOREP:
+ case DISCREQ:
+ if (len >= 4) {
+ GETLONG(cilong, p);
+ printer(arg, " magic=0x%x", cilong);
+ len -= 4;
+ }
+ break;
+
+ case IDENTIF:
+ case TIMEREM:
+ if (len >= 4) {
+ GETLONG(cilong, p);
+ printer(arg, " magic=0x%x", cilong);
+ len -= 4;
+ }
+ if (code == TIMEREM) {
+ if (len < 4)
+ break;
+ GETLONG(cilong, p);
+ printer(arg, " seconds=%u", cilong);
+ len -= 4;
+ }
+ if (len > 0) {
+ printer(arg, " ");
+ ppp_print_string(p, len, printer, arg);
+ p += len;
+ len = 0;
+ }
+ break;
+ default:
+ break;
+ }
+
+ /* print the rest of the bytes in the packet */
+ for (i = 0; i < len && i < 32; ++i) {
+ GETCHAR(code, p);
+ printer(arg, " %.2x", code);
+ }
+ if (i < len) {
+ printer(arg, " ...");
+ p += len - i;
+ }
+
+ return p - pstart;
+}
+#endif /* PRINTPKT_SUPPORT */
+
+/*
+ * Time to shut down the link because there is nothing out there.
+ */
+
+static void LcpLinkFailure(fsm *f) {
+ ppp_pcb *pcb = f->pcb;
+ if (f->state == PPP_FSM_OPENED) {
+ ppp_info("No response to %d echo-requests", pcb->lcp_echos_pending);
+ ppp_notice("Serial link appears to be disconnected.");
+ pcb->err_code = PPPERR_PEERDEAD;
+ lcp_close(pcb, "Peer not responding");
+ }
+}
+
+/*
+ * Timer expired for the LCP echo requests from this process.
+ */
+
+static void LcpEchoCheck(fsm *f) {
+ ppp_pcb *pcb = f->pcb;
+
+ LcpSendEchoRequest (f);
+ if (f->state != PPP_FSM_OPENED)
+ return;
+
+ /*
+ * Start the timer for the next interval.
+ */
+ if (pcb->lcp_echo_timer_running)
+ ppp_warn("assertion lcp_echo_timer_running==0 failed");
+ TIMEOUT (LcpEchoTimeout, f, pcb->settings.lcp_echo_interval);
+ pcb->lcp_echo_timer_running = 1;
+}
+
+/*
+ * LcpEchoTimeout - Timer expired on the LCP echo
+ */
+
+static void LcpEchoTimeout(void *arg) {
+ fsm *f = (fsm*)arg;
+ ppp_pcb *pcb = f->pcb;
+ if (pcb->lcp_echo_timer_running != 0) {
+ pcb->lcp_echo_timer_running = 0;
+ LcpEchoCheck ((fsm *) arg);
+ }
+}
+
+/*
+ * LcpEchoReply - LCP has received a reply to the echo
+ */
+
+static void lcp_received_echo_reply(fsm *f, int id, u_char *inp, int len) {
+ ppp_pcb *pcb = f->pcb;
+ lcp_options *go = &pcb->lcp_gotoptions;
+ u32_t magic_val;
+ LWIP_UNUSED_ARG(id);
+
+ /* Check the magic number - don't count replies from ourselves. */
+ if (len < 4) {
+ ppp_dbglog("lcp: received short Echo-Reply, length %d", len);
+ return;
+ }
+ GETLONG(magic_val, inp);
+ if (go->neg_magicnumber
+ && magic_val == go->magicnumber) {
+ ppp_warn("appear to have received our own echo-reply!");
+ return;
+ }
+
+ /* Reset the number of outstanding echo frames */
+ pcb->lcp_echos_pending = 0;
+}
+
+/*
+ * LcpSendEchoRequest - Send an echo request frame to the peer
+ */
+
+static void LcpSendEchoRequest(fsm *f) {
+ ppp_pcb *pcb = f->pcb;
+ lcp_options *go = &pcb->lcp_gotoptions;
+ u32_t lcp_magic;
+ u_char pkt[4], *pktp;
+
+ /*
+ * Detect the failure of the peer at this point.
+ */
+ if (pcb->settings.lcp_echo_fails != 0) {
+ if (pcb->lcp_echos_pending >= pcb->settings.lcp_echo_fails) {
+ LcpLinkFailure(f);
+ pcb->lcp_echos_pending = 0;
+ }
+ }
+
+#if PPP_LCP_ADAPTIVE
+ /*
+ * If adaptive echos have been enabled, only send the echo request if
+ * no traffic was received since the last one.
+ */
+ if (pcb->settings.lcp_echo_adaptive) {
+ static unsigned int last_pkts_in = 0;
+
+#if PPP_STATS_SUPPORT
+ update_link_stats(f->unit);
+ link_stats_valid = 0;
+#endif /* PPP_STATS_SUPPORT */
+
+ if (link_stats.pkts_in != last_pkts_in) {
+ last_pkts_in = link_stats.pkts_in;
+ return;
+ }
+ }
+#endif
+
+ /*
+ * Make and send the echo request frame.
+ */
+ if (f->state == PPP_FSM_OPENED) {
+ lcp_magic = go->magicnumber;
+ pktp = pkt;
+ PUTLONG(lcp_magic, pktp);
+ fsm_sdata(f, ECHOREQ, pcb->lcp_echo_number++, pkt, pktp - pkt);
+ ++pcb->lcp_echos_pending;
+ }
+}
+
+/*
+ * lcp_echo_lowerup - Start the timer for the LCP frame
+ */
+
+static void lcp_echo_lowerup(ppp_pcb *pcb) {
+ fsm *f = &pcb->lcp_fsm;
+
+ /* Clear the parameters for generating echo frames */
+ pcb->lcp_echos_pending = 0;
+ pcb->lcp_echo_number = 0;
+ pcb->lcp_echo_timer_running = 0;
+
+ /* If a timeout interval is specified then start the timer */
+ if (pcb->settings.lcp_echo_interval != 0)
+ LcpEchoCheck (f);
+}
+
+/*
+ * lcp_echo_lowerdown - Stop the timer for the LCP frame
+ */
+
+static void lcp_echo_lowerdown(ppp_pcb *pcb) {
+ fsm *f = &pcb->lcp_fsm;
+
+ if (pcb->lcp_echo_timer_running != 0) {
+ UNTIMEOUT (LcpEchoTimeout, f);
+ pcb->lcp_echo_timer_running = 0;
+ }
+}
+
+#endif /* PPP_SUPPORT */
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-02 16:44:06 +0000