diff options
Diffstat (limited to 'firmware/zpu/lwip/lwip-1.3.1/src/netif/ppp/lcp.c')
| -rw-r--r-- | firmware/zpu/lwip/lwip-1.3.1/src/netif/ppp/lcp.c | 2035 |
1 files changed, 2035 insertions, 0 deletions
diff --git a/firmware/zpu/lwip/lwip-1.3.1/src/netif/ppp/lcp.c b/firmware/zpu/lwip/lwip-1.3.1/src/netif/ppp/lcp.c new file mode 100644 index 000000000..85a0add95 --- /dev/null +++ b/firmware/zpu/lwip/lwip-1.3.1/src/netif/ppp/lcp.c @@ -0,0 +1,2035 @@ +/***************************************************************************** +* lcp.c - Network Link Control Protocol program file. +* +* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc. +* portions Copyright (c) 1997 by Global Election Systems Inc. +* +* The authors hereby grant permission to use, copy, modify, distribute, +* and license this software and its documentation for any purpose, provided +* that existing copyright notices are retained in all copies and that this +* notice and the following disclaimer are included verbatim in any +* distributions. No written agreement, license, or royalty fee is required +* for any of the authorized uses. +* +* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *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 CONTRIBUTORS 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. +* +****************************************************************************** +* REVISION HISTORY +* +* 03-01-01 Marc Boucher <marc@mbsi.ca> +* Ported to lwIP. +* 97-12-01 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc. +* Original. +*****************************************************************************/ + +/* + * lcp.c - PPP Link Control Protocol. + * + * Copyright (c) 1989 Carnegie Mellon University. + * All rights reserved. + * + * Redistribution and use in source and binary forms are permitted + * provided that the above copyright notice and this paragraph are + * duplicated in all such forms and that any documentation, + * advertising materials, and other materials related to such + * distribution and use acknowledge that the software was developed + * by Carnegie Mellon University. The name of the + * University may not be used to endorse or promote products derived + * from this software without specific prior written permission. + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + + +#include "lwip/opt.h" + +#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */ + +#include "ppp.h" +#include "pppdebug.h" + +#include "fsm.h" +#include "chap.h" +#include "magic.h" +#include "auth.h" +#include "lcp.h" + +#include <string.h> + +#if PPPOE_SUPPORT +#include "netif/ppp_oe.h" +#else +#define PPPOE_MAXMTU PPP_MAXMRU +#endif + + +/*************************/ +/*** LOCAL DEFINITIONS ***/ +/*************************/ +/* + * Length of each type of configuration option (in octets) + */ +#define CILEN_VOID 2 +#define CILEN_CHAR 3 +#define CILEN_SHORT 4 /* CILEN_VOID + sizeof(short) */ +#define CILEN_CHAP 5 /* CILEN_VOID + sizeof(short) + 1 */ +#define CILEN_LONG 6 /* CILEN_VOID + sizeof(long) */ +#define CILEN_LQR 8 /* CILEN_VOID + sizeof(short) + sizeof(long) */ +#define CILEN_CBCP 3 + + +/***********************************/ +/*** LOCAL FUNCTION DECLARATIONS ***/ +/***********************************/ +/* + * Callbacks for fsm code. (CI = Configuration Information) + */ +static void lcp_resetci (fsm*); /* Reset our CI */ +static int lcp_cilen (fsm*); /* Return length of our CI */ +static void lcp_addci (fsm*, u_char*, int*); /* Add our CI to pkt */ +static int lcp_ackci (fsm*, u_char*, int); /* Peer ack'd our CI */ +static int lcp_nakci (fsm*, u_char*, int); /* Peer nak'd our CI */ +static int lcp_rejci (fsm*, u_char*, int); /* Peer rej'd our CI */ +static int lcp_reqci (fsm*, u_char*, int*, int); /* Rcv peer CI */ +static void lcp_up (fsm*); /* We're UP */ +static void lcp_down (fsm*); /* 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*, int, u_char, u_char*, int); + +static void lcp_rprotrej (fsm*, u_char*, int); + +/* + * routines to send LCP echos to peer + */ +static void lcp_echo_lowerup (int); +static void lcp_echo_lowerdown (int); +static void LcpEchoTimeout (void*); +static void lcp_received_echo_reply (fsm*, int, u_char*, int); +static void LcpSendEchoRequest (fsm*); +static void LcpLinkFailure (fsm*); +static void LcpEchoCheck (fsm*); + +/* + * Protocol entry points. + * Some of these are called directly. + */ +static void lcp_input (int, u_char *, int); +static void lcp_protrej (int); + +#define CODENAME(x) ((x) == CONFACK ? "ACK" : (x) == CONFNAK ? "NAK" : "REJ") + + +/******************************/ +/*** PUBLIC DATA STRUCTURES ***/ +/******************************/ +/* global vars */ +LinkPhase lcp_phase[NUM_PPP]; /* Phase of link session (RFC 1661) */ +lcp_options lcp_wantoptions[NUM_PPP]; /* Options that we want to request */ +lcp_options lcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */ +lcp_options lcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */ +lcp_options lcp_hisoptions[NUM_PPP]; /* Options that we ack'd */ +ext_accm xmit_accm[NUM_PPP]; /* extended transmit ACCM */ + + + +/*****************************/ +/*** LOCAL DATA STRUCTURES ***/ +/*****************************/ +static fsm lcp_fsm[NUM_PPP]; /* LCP fsm structure (global)*/ +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 */ +static u32_t lcp_echos_pending = 0; /* Number of outstanding echo msgs */ +static u32_t lcp_echo_number = 0; /* ID number of next echo frame */ +static u32_t lcp_echo_timer_running = 0; /* TRUE if a timer is running */ + +static u_char nak_buffer[PPP_MRU]; /* where we construct a nak packet */ + +static 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 LS_OPENED state */ + lcp_down, /* Called when fsm leaves LS_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 */ +}; + +struct protent lcp_protent = { + PPP_LCP, + lcp_init, + lcp_input, + lcp_protrej, + lcp_lowerup, + lcp_lowerdown, + lcp_open, + lcp_close, +#if 0 + lcp_printpkt, + NULL, +#endif + 1, + "LCP", +#if 0 + NULL, + NULL, + NULL +#endif +}; + +int lcp_loopbackfail = DEFLOOPBACKFAIL; + + + +/***********************************/ +/*** PUBLIC FUNCTION DEFINITIONS ***/ +/***********************************/ +/* + * lcp_init - Initialize LCP. + */ +void +lcp_init(int unit) +{ + fsm *f = &lcp_fsm[unit]; + lcp_options *wo = &lcp_wantoptions[unit]; + lcp_options *ao = &lcp_allowoptions[unit]; + + f->unit = unit; + f->protocol = PPP_LCP; + f->callbacks = &lcp_callbacks; + + fsm_init(f); + + wo->passive = 0; + wo->silent = 0; + wo->restart = 0; /* Set to 1 in kernels or multi-line implementations */ + wo->neg_mru = 1; + wo->mru = PPP_DEFMRU; + wo->neg_asyncmap = 1; + wo->asyncmap = 0x00000000l; /* Assume don't need to escape any ctl chars. */ + wo->neg_chap = 0; /* Set to 1 on server */ + wo->neg_upap = 0; /* Set to 1 on server */ + wo->chap_mdtype = CHAP_DIGEST_MD5; + wo->neg_magicnumber = 1; + wo->neg_pcompression = 1; + wo->neg_accompression = 1; + wo->neg_lqr = 0; /* no LQR implementation yet */ + wo->neg_cbcp = 0; + + ao->neg_mru = 1; + ao->mru = PPP_MAXMRU; + ao->neg_asyncmap = 1; + ao->asyncmap = 0x00000000l; /* Assume don't need to escape any ctl chars. */ + ao->neg_chap = (CHAP_SUPPORT != 0); + ao->chap_mdtype = CHAP_DIGEST_MD5; + ao->neg_upap = (PAP_SUPPORT != 0); + ao->neg_magicnumber = 1; + ao->neg_pcompression = 1; + ao->neg_accompression = 1; + ao->neg_lqr = 0; /* no LQR implementation yet */ + ao->neg_cbcp = (CBCP_SUPPORT != 0); + + /* + * Set transmit escape for the flag and escape characters plus anything + * set for the allowable options. + */ + memset(xmit_accm[unit], 0, sizeof(xmit_accm[0])); + xmit_accm[unit][15] = 0x60; + xmit_accm[unit][0] = (u_char)((ao->asyncmap & 0xFF)); + xmit_accm[unit][1] = (u_char)((ao->asyncmap >> 8) & 0xFF); + xmit_accm[unit][2] = (u_char)((ao->asyncmap >> 16) & 0xFF); + xmit_accm[unit][3] = (u_char)((ao->asyncmap >> 24) & 0xFF); + LCPDEBUG((LOG_INFO, "lcp_init: xmit_accm=%X %X %X %X\n", + xmit_accm[unit][0], + xmit_accm[unit][1], + xmit_accm[unit][2], + xmit_accm[unit][3])); + + lcp_phase[unit] = PHASE_INITIALIZE; +} + + +/* + * lcp_open - LCP is allowed to come up. + */ +void +lcp_open(int unit) +{ + fsm *f = &lcp_fsm[unit]; + lcp_options *wo = &lcp_wantoptions[unit]; + + f->flags = 0; + if (wo->passive) { + f->flags |= OPT_PASSIVE; + } + if (wo->silent) { + f->flags |= OPT_SILENT; + } + fsm_open(f); + + lcp_phase[unit] = PHASE_ESTABLISH; +} + + +/* + * lcp_close - Take LCP down. + */ +void +lcp_close(int unit, char *reason) +{ + fsm *f = &lcp_fsm[unit]; + + if (lcp_phase[unit] != PHASE_DEAD) { + lcp_phase[unit] = PHASE_TERMINATE; + } + if (f->state == LS_STOPPED && f->flags & (OPT_PASSIVE|OPT_SILENT)) { + /* + * This action is not strictly according to the FSM in RFC1548, + * but it does mean that the program terminates if you do an + * lcp_close() in passive/silent mode when a connection hasn't + * been established. + */ + f->state = LS_CLOSED; + lcp_finished(f); + } else { + fsm_close(&lcp_fsm[unit], reason); + } +} + + +/* + * lcp_lowerup - The lower layer is up. + */ +void +lcp_lowerup(int unit) +{ + lcp_options *wo = &lcp_wantoptions[unit]; + + /* + * 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. + */ + ppp_set_xaccm(unit, &xmit_accm[unit]); + ppp_send_config(unit, PPP_MRU, 0xffffffffl, 0, 0); + ppp_recv_config(unit, PPP_MRU, 0x00000000l, + wo->neg_pcompression, wo->neg_accompression); + peer_mru[unit] = PPP_MRU; + lcp_allowoptions[unit].asyncmap = (u_long)xmit_accm[unit][0] + | ((u_long)xmit_accm[unit][1] << 8) + | ((u_long)xmit_accm[unit][2] << 16) + | ((u_long)xmit_accm[unit][3] << 24); + LCPDEBUG((LOG_INFO, "lcp_lowerup: asyncmap=%X %X %X %X\n", + xmit_accm[unit][3], + xmit_accm[unit][2], + xmit_accm[unit][1], + xmit_accm[unit][0])); + + fsm_lowerup(&lcp_fsm[unit]); +} + + +/* + * lcp_lowerdown - The lower layer is down. + */ +void +lcp_lowerdown(int unit) +{ + fsm_lowerdown(&lcp_fsm[unit]); +} + +/* + * lcp_sprotrej - Send a Protocol-Reject for some protocol. + */ +void +lcp_sprotrej(int unit, u_char *p, int len) +{ + /* + * Send back the protocol and the information field of the + * rejected packet. We only get here if LCP is in the LS_OPENED state. + */ + + fsm_sdata(&lcp_fsm[unit], PROTREJ, ++lcp_fsm[unit].id, p, len); +} + + + +/**********************************/ +/*** LOCAL FUNCTION DEFINITIONS ***/ +/**********************************/ +/* + * lcp_input - Input LCP packet. + */ +static void +lcp_input(int unit, u_char *p, int len) +{ + fsm *f = &lcp_fsm[unit]; + + fsm_input(f, p, len); +} + + +/* + * lcp_extcode - Handle a LCP-specific code. + */ +static int +lcp_extcode(fsm *f, int code, u_char id, u_char *inp, int len) +{ + u_char *magp; + + switch( code ){ + case PROTREJ: + lcp_rprotrej(f, inp, len); + break; + + case ECHOREQ: + if (f->state != LS_OPENED) { + break; + } + LCPDEBUG((LOG_INFO, "lcp: Echo-Request, Rcvd id %d\n", id)); + magp = inp; + PUTLONG(lcp_gotoptions[f->unit].magicnumber, magp); + fsm_sdata(f, ECHOREP, id, inp, len); + break; + + case ECHOREP: + lcp_received_echo_reply(f, id, inp, len); + break; + + case DISCREQ: + 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; + struct protent *protp; + u_short prot; + + if (len < sizeof (u_short)) { + LCPDEBUG((LOG_INFO, "lcp_rprotrej: Rcvd short Protocol-Reject packet!\n")); + return; + } + + GETSHORT(prot, inp); + + LCPDEBUG((LOG_INFO, "lcp_rprotrej: Rcvd Protocol-Reject packet for %x!\n", prot)); + + /* + * Protocol-Reject packets received in any state other than the LCP + * LS_OPENED state SHOULD be silently discarded. + */ + if( f->state != LS_OPENED ) { + LCPDEBUG((LOG_INFO, "Protocol-Reject discarded: LCP in state %d\n", f->state)); + return; + } + + /* + * Upcall the proper Protocol-Reject routine. + */ + for (i = 0; (protp = ppp_protocols[i]) != NULL; ++i) { + if (protp->protocol == prot && protp->enabled_flag) { + (*protp->protrej)(f->unit); + return; + } + } + + LCPDEBUG((LOG_WARNING, "Protocol-Reject for unsupported protocol 0x%x\n", prot)); +} + + +/* + * lcp_protrej - A Protocol-Reject was received. + */ +static void +lcp_protrej(int unit) +{ + LWIP_UNUSED_ARG(unit); + /* + * Can't reject LCP! + */ + LCPDEBUG((LOG_WARNING, "lcp_protrej: Received Protocol-Reject for LCP!\n")); + fsm_protreject(&lcp_fsm[unit]); +} + + +/* + * lcp_resetci - Reset our CI. + */ +static void +lcp_resetci(fsm *f) +{ + lcp_wantoptions[f->unit].magicnumber = magic(); + lcp_wantoptions[f->unit].numloops = 0; + lcp_gotoptions[f->unit] = lcp_wantoptions[f->unit]; + peer_mru[f->unit] = PPP_MRU; + auth_reset(f->unit); +} + + +/* + * lcp_cilen - Return length of our CI. + */ +static int lcp_cilen(fsm *f) +{ + lcp_options *go = &lcp_gotoptions[f->unit]; + +#define LENCIVOID(neg) ((neg) ? CILEN_VOID : 0) +#define LENCICHAP(neg) ((neg) ? CILEN_CHAP : 0) +#define LENCISHORT(neg) ((neg) ? CILEN_SHORT : 0) +#define LENCILONG(neg) ((neg) ? CILEN_LONG : 0) +#define LENCILQR(neg) ((neg) ? CILEN_LQR: 0) +#define LENCICBCP(neg) ((neg) ? CILEN_CBCP: 0) + /* + * NB: we only ask for one of CHAP and UPAP, even if we will + * accept either. + */ + return (LENCISHORT(go->neg_mru && go->mru != PPP_DEFMRU) + + LENCILONG(go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl) + + LENCICHAP(go->neg_chap) + + LENCISHORT(!go->neg_chap && go->neg_upap) + + LENCILQR(go->neg_lqr) + + LENCICBCP(go->neg_cbcp) + + LENCILONG(go->neg_magicnumber) + + LENCIVOID(go->neg_pcompression) + + LENCIVOID(go->neg_accompression)); +} + + +/* + * lcp_addci - Add our desired CIs to a packet. + */ +static void +lcp_addci(fsm *f, u_char *ucp, int *lenp) +{ + lcp_options *go = &lcp_gotoptions[f->unit]; + u_char *start_ucp = ucp; + +#define ADDCIVOID(opt, neg) \ + if (neg) { \ + LCPDEBUG((LOG_INFO, "lcp_addci: opt=%d\n", opt)); \ + PUTCHAR(opt, ucp); \ + PUTCHAR(CILEN_VOID, ucp); \ + } +#define ADDCISHORT(opt, neg, val) \ + if (neg) { \ + LCPDEBUG((LOG_INFO, "lcp_addci: INT opt=%d %X\n", opt, val)); \ + PUTCHAR(opt, ucp); \ + PUTCHAR(CILEN_SHORT, ucp); \ + PUTSHORT(val, ucp); \ + } +#define ADDCICHAP(opt, neg, val, digest) \ + if (neg) { \ + LCPDEBUG((LOG_INFO, "lcp_addci: CHAP opt=%d %X\n", opt, val)); \ + PUTCHAR(opt, ucp); \ + PUTCHAR(CILEN_CHAP, ucp); \ + PUTSHORT(val, ucp); \ + PUTCHAR(digest, ucp); \ + } +#define ADDCILONG(opt, neg, val) \ + if (neg) { \ + LCPDEBUG((LOG_INFO, "lcp_addci: L opt=%d %lX\n", opt, val)); \ + PUTCHAR(opt, ucp); \ + PUTCHAR(CILEN_LONG, ucp); \ + PUTLONG(val, ucp); \ + } +#define ADDCILQR(opt, neg, val) \ + if (neg) { \ + LCPDEBUG((LOG_INFO, "lcp_addci: LQR opt=%d %lX\n", opt, val)); \ + PUTCHAR(opt, ucp); \ + PUTCHAR(CILEN_LQR, ucp); \ + PUTSHORT(PPP_LQR, ucp); \ + PUTLONG(val, ucp); \ + } +#define ADDCICHAR(opt, neg, val) \ + if (neg) { \ + LCPDEBUG((LOG_INFO, "lcp_addci: CHAR opt=%d %X '%z'\n", opt, val, val)); \ + PUTCHAR(opt, ucp); \ + PUTCHAR(CILEN_CHAR, ucp); \ + PUTCHAR(val, ucp); \ + } + + ADDCISHORT(CI_MRU, go->neg_mru && go->mru != PPP_DEFMRU, go->mru); + ADDCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl, go->asyncmap); + ADDCICHAP(CI_AUTHTYPE, go->neg_chap, PPP_CHAP, go->chap_mdtype); + ADDCISHORT(CI_AUTHTYPE, !go->neg_chap && go->neg_upap, PPP_PAP); + ADDCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period); + 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); + + if (ucp - start_ucp != *lenp) { + /* this should never happen, because peer_mtu should be 1500 */ + LCPDEBUG((LOG_ERR, "Bug in lcp_addci: wrong length\n")); + } +} + + +/* + * 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) +{ + lcp_options *go = &lcp_gotoptions[f->unit]; + 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; \ + } +#define ACKCICHAP(opt, neg, val, digest) \ + 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 != val) \ + goto bad; \ + GETCHAR(cichar, p); \ + if (cichar != digest) \ + goto bad; \ + } +#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; \ + } +#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; \ + } + + ACKCISHORT(CI_MRU, go->neg_mru && go->mru != PPP_DEFMRU, go->mru); + ACKCILONG(CI_ASYNCMAP, go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl, go->asyncmap); + ACKCICHAP(CI_AUTHTYPE, go->neg_chap, PPP_CHAP, go->chap_mdtype); + ACKCISHORT(CI_AUTHTYPE, !go->neg_chap && go->neg_upap, PPP_PAP); + ACKCILQR(CI_QUALITY, go->neg_lqr, go->lqr_period); + 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); + + /* + * If there are any remaining CIs, then this packet is bad. + */ + if (len != 0) { + goto bad; + } + LCPDEBUG((LOG_INFO, "lcp_acki: Ack\n")); + return (1); +bad: + LCPDEBUG((LOG_WARNING, "lcp_acki: received bad Ack!\n")); + 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 LS_OPENED state. + * + * Returns: + * 0 - Nak was bad. + * 1 - Nak was good. + */ +static int +lcp_nakci(fsm *f, u_char *p, int len) +{ + lcp_options *go = &lcp_gotoptions[f->unit]; + lcp_options *wo = &lcp_wantoptions[f->unit]; + 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, code) \ + if (go->neg && \ + len >= CILEN_VOID && \ + p[1] == CILEN_VOID && \ + p[0] == opt) { \ + len -= CILEN_VOID; \ + INCPTR(CILEN_VOID, p); \ + no.neg = 1; \ + code \ + } +#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 \ + } +#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 \ + } +#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 \ + } + + /* + * 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 != 0xFFFFFFFFl) { + 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 ((go->neg_chap || go->neg_upap) + && len >= CILEN_SHORT + && p[0] == CI_AUTHTYPE && p[1] >= CILEN_SHORT && p[1] <= len) { + cilen = p[1]; + len -= cilen; + no.neg_chap = go->neg_chap; + no.neg_upap = go->neg_upap; + INCPTR(2, p); + GETSHORT(cishort, p); + if (cishort == PPP_PAP && cilen == CILEN_SHORT) { + /* + * If we were asking for CHAP, they obviously don't want to do it. + * If we weren't asking for CHAP, then we were asking for PAP, + * in which case this Nak is bad. + */ + if (!go->neg_chap) { + goto bad; + } + try.neg_chap = 0; + + } else if (cishort == PPP_CHAP && cilen == CILEN_CHAP) { + GETCHAR(cichar, p); + if (go->neg_chap) { + /* + * We were asking for CHAP/MD5; they must want a different + * algorithm. If they can't do MD5, we'll have to stop + * asking for CHAP. + */ + if (cichar != go->chap_mdtype) { + try.neg_chap = 0; + } + } else { + /* + * Stop asking for PAP if we were asking for it. + */ + try.neg_upap = 0; + } + + } else { + /* + * We don't recognize what they're suggesting. + * Stop asking for what we were asking for. + */ + if (go->neg_chap) { + try.neg_chap = 0; + } else { + try.neg_upap = 0; + } + p += cilen - CILEN_SHORT; + } + } + + /* + * 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; + } + ); + + /* + * Only implementing CBCP...not the rest of the callback options + */ + NAKCICHAR(CI_CALLBACK, neg_cbcp, + try.neg_cbcp = 0; + ); + + /* + * 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, + try.neg_pcompression = 0; + ); + NAKCIVOID(CI_ACCOMPRESSION, neg_accompression, + try.neg_accompression = 0; + ); + + /* + * 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.mru = cishort; + } + break; + case CI_ASYNCMAP: + if ((go->neg_asyncmap && go->asyncmap != 0xFFFFFFFFl) + || no.neg_asyncmap || cilen != CILEN_LONG) { + goto bad; + } + break; + case CI_AUTHTYPE: + if (go->neg_chap || no.neg_chap || go->neg_upap || no.neg_upap) { + 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; + case CI_QUALITY: + if (go->neg_lqr || no.neg_lqr || cilen != CILEN_LQR) { + goto bad; + } + break; + } + p = next; + } + + /* If there is still anything left, this packet is bad. */ + if (len != 0) { + goto bad; + } + + /* + * OK, the Nak is good. Now we can update state. + */ + if (f->state != LS_OPENED) { + if (looped_back) { + if (++try.numloops >= lcp_loopbackfail) { + LCPDEBUG((LOG_NOTICE, "Serial line is looped back.\n")); + lcp_close(f->unit, "Loopback detected"); + } + } else { + try.numloops = 0; + } + *go = try; + } + + return 1; + +bad: + LCPDEBUG((LOG_WARNING, "lcp_nakci: received bad Nak!\n")); + 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 LS_OPENED state. + * + * Returns: + * 0 - Reject was bad. + * 1 - Reject was good. + */ +static int +lcp_rejci(fsm *f, u_char *p, int len) +{ + lcp_options *go = &lcp_gotoptions[f->unit]; + 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; \ + LCPDEBUG((LOG_INFO, "lcp_rejci: void opt %d rejected\n", opt)); \ + } +#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; \ + LCPDEBUG((LOG_INFO,"lcp_rejci: short opt %d rejected\n", opt)); \ + } +#define REJCICHAP(opt, neg, val, digest) \ + 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 != val || cichar != digest) { \ + goto bad; \ + } \ + try.neg = 0; \ + try.neg_upap = 0; \ + LCPDEBUG((LOG_INFO,"lcp_rejci: chap opt %d rejected\n", opt)); \ + } +#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; \ + LCPDEBUG((LOG_INFO,"lcp_rejci: long opt %d rejected\n", opt)); \ + } +#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; \ + LCPDEBUG((LOG_INFO,"lcp_rejci: LQR opt %d rejected\n", opt)); \ + } +#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; \ + LCPDEBUG((LOG_INFO,"lcp_rejci: Callback opt %d rejected\n", opt)); \ + } + + REJCISHORT(CI_MRU, neg_mru, go->mru); + REJCILONG(CI_ASYNCMAP, neg_asyncmap, go->asyncmap); + REJCICHAP(CI_AUTHTYPE, neg_chap, PPP_CHAP, go->chap_mdtype); + if (!go->neg_chap) { + REJCISHORT(CI_AUTHTYPE, neg_upap, PPP_PAP); + } + REJCILQR(CI_QUALITY, neg_lqr, go->lqr_period); + REJCICBCP(CI_CALLBACK, neg_cbcp, CBCP_OPT); + REJCILONG(CI_MAGICNUMBER, neg_magicnumber, go->magicnumber); + REJCIVOID(CI_PCOMPRESSION, neg_pcompression); + REJCIVOID(CI_ACCOMPRESSION, neg_accompression); + + /* + * If there are any remaining CIs, then this packet is bad. + */ + if (len != 0) { + goto bad; + } + /* + * Now we can update state. + */ + if (f->state != LS_OPENED) { + *go = try; + } + return 1; + +bad: + LCPDEBUG((LOG_WARNING, "lcp_rejci: received bad Reject!\n")); + 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. + */ +static int +lcp_reqci(fsm *f, + u_char *inp, /* Requested CIs */ + int *lenp, /* Length of requested CIs */ + int reject_if_disagree) +{ + lcp_options *go = &lcp_gotoptions[f->unit]; + lcp_options *ho = &lcp_hisoptions[f->unit]; + lcp_options *ao = &lcp_allowoptions[f->unit]; + 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 */ + u_char *nakp; /* Pointer to next char in Nak frame */ + int l = *lenp; /* Length left */ +#if TRACELCP > 0 + char traceBuf[80]; + int traceNdx = 0; +#endif + + /* + * Reset all his options. + */ + BZERO(ho, sizeof(*ho)); + + /* + * Process all his options. + */ + next = inp; + nakp = nak_buffer; + 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((LOG_WARNING, "lcp_reqci: bad CI length!\n")); + 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? */ + LCPDEBUG((LOG_INFO, "lcp_reqci: Reject MRU - not allowed\n")); + orc = CONFREJ; /* Reject CI */ + break; + } else if (cilen != CILEN_SHORT) { /* Check CI length */ + LCPDEBUG((LOG_INFO, "lcp_reqci: Reject MRU - bad length\n")); + 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) { + LCPDEBUG((LOG_INFO, "lcp_reqci: Nak - MRU too small\n")); + orc = CONFNAK; /* Nak CI */ + PUTCHAR(CI_MRU, nakp); + PUTCHAR(CILEN_SHORT, nakp); + PUTSHORT(PPP_MINMRU, nakp); /* Give him a hint */ + break; + } + ho->neg_mru = 1; /* Remember he sent MRU */ + ho->mru = cishort; /* And remember value */ +#if TRACELCP > 0 + snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " MRU %d", cishort); + traceNdx = strlen(traceBuf); +#endif + break; + + case CI_ASYNCMAP: + if (!ao->neg_asyncmap) { + LCPDEBUG((LOG_INFO, "lcp_reqci: Reject ASYNCMAP not allowed\n")); + orc = CONFREJ; + break; + } else if (cilen != CILEN_LONG) { + LCPDEBUG((LOG_INFO, "lcp_reqci: Reject ASYNCMAP bad length\n")); + 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) { + LCPDEBUG((LOG_INFO, "lcp_reqci: Nak ASYNCMAP %lX missing %lX\n", + cilong, ao->asyncmap)); + orc = CONFNAK; + PUTCHAR(CI_ASYNCMAP, nakp); + PUTCHAR(CILEN_LONG, nakp); + PUTLONG(ao->asyncmap | cilong, nakp); + break; + } + ho->neg_asyncmap = 1; + ho->asyncmap = cilong; +#if TRACELCP > 0 + snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " ASYNCMAP=%lX", cilong); + traceNdx = strlen(traceBuf); +#endif + break; + + case CI_AUTHTYPE: + if (cilen < CILEN_SHORT) { + LCPDEBUG((LOG_INFO, "lcp_reqci: Reject AUTHTYPE missing arg\n")); + orc = CONFREJ; + break; + } else if (!(ao->neg_upap || ao->neg_chap)) { + /* + * Reject the option if we're not willing to authenticate. + */ + LCPDEBUG((LOG_INFO, "lcp_reqci: Reject AUTHTYPE not allowed\n")); + orc = CONFREJ; + break; + } + GETSHORT(cishort, p); + + /* + * Authtype must be UPAP or CHAP. + * + * Note: if both ao->neg_upap and ao->neg_chap are set, + * and the peer sends a Configure-Request with two + * authenticate-protocol requests, one for CHAP and one + * for UPAP, then we will reject the second request. + * Whether we end up doing CHAP or UPAP depends then on + * the ordering of the CIs in the peer's Configure-Request. + */ + + if (cishort == PPP_PAP) { + if (ho->neg_chap) { /* we've already accepted CHAP */ + LCPDEBUG((LOG_WARNING, "lcp_reqci: Reject AUTHTYPE PAP already accepted\n")); + orc = CONFREJ; + break; + } else if (cilen != CILEN_SHORT) { + LCPDEBUG((LOG_WARNING, "lcp_reqci: Reject AUTHTYPE PAP bad len\n")); + orc = CONFREJ; + break; + } + if (!ao->neg_upap) { /* we don't want to do PAP */ + LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE PAP not allowed\n")); + orc = CONFNAK; /* NAK it and suggest CHAP */ + PUTCHAR(CI_AUTHTYPE, nakp); + PUTCHAR(CILEN_CHAP, nakp); + PUTSHORT(PPP_CHAP, nakp); + PUTCHAR(ao->chap_mdtype, nakp); + break; + } + ho->neg_upap = 1; +#if TRACELCP > 0 + snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " PAP (%X)", cishort); + traceNdx = strlen(traceBuf); +#endif + break; + } + if (cishort == PPP_CHAP) { + if (ho->neg_upap) { /* we've already accepted PAP */ + LCPDEBUG((LOG_WARNING, "lcp_reqci: Reject AUTHTYPE CHAP accepted PAP\n")); + orc = CONFREJ; + break; + } else if (cilen != CILEN_CHAP) { + LCPDEBUG((LOG_WARNING, "lcp_reqci: Reject AUTHTYPE CHAP bad len\n")); + orc = CONFREJ; + break; + } + if (!ao->neg_chap) { /* we don't want to do CHAP */ + LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE CHAP not allowed\n")); + orc = CONFNAK; /* NAK it and suggest PAP */ + PUTCHAR(CI_AUTHTYPE, nakp); + PUTCHAR(CILEN_SHORT, nakp); + PUTSHORT(PPP_PAP, nakp); + break; + } + GETCHAR(cichar, p); /* get digest type*/ + if (cichar != CHAP_DIGEST_MD5 +#ifdef CHAPMS + && cichar != CHAP_MICROSOFT +#endif + ) { + LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE CHAP digest=%d\n", cichar)); + orc = CONFNAK; + PUTCHAR(CI_AUTHTYPE, nakp); + PUTCHAR(CILEN_CHAP, nakp); + PUTSHORT(PPP_CHAP, nakp); + PUTCHAR(ao->chap_mdtype, nakp); + break; + } +#if TRACELCP > 0 + snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " CHAP %X,%d", cishort, cichar); + traceNdx = strlen(traceBuf); +#endif + ho->chap_mdtype = cichar; /* save md type */ + ho->neg_chap = 1; + break; + } + + /* + * 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.) + */ + orc = CONFNAK; + PUTCHAR(CI_AUTHTYPE, nakp); + if (ao->neg_chap) { + LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE %d req CHAP\n", cishort)); + PUTCHAR(CILEN_CHAP, nakp); + PUTSHORT(PPP_CHAP, nakp); + PUTCHAR(ao->chap_mdtype, nakp); + } else { + LCPDEBUG((LOG_WARNING, "lcp_reqci: Nak AUTHTYPE %d req PAP\n", cishort)); + PUTCHAR(CILEN_SHORT, nakp); + PUTSHORT(PPP_PAP, nakp); + } + break; + + case CI_QUALITY: + GETSHORT(cishort, p); + GETLONG(cilong, p); +#if TRACELCP > 0 + snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " QUALITY (%x %x)", cishort, (unsigned int) cilong); + traceNdx = strlen(traceBuf); +#endif + + if (!ao->neg_lqr || + cilen != CILEN_LQR) { + orc = CONFREJ; + break; + } + + /* + * 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, nakp); + PUTCHAR(CILEN_LQR, nakp); + PUTSHORT(PPP_LQR, nakp); + PUTLONG(ao->lqr_period, nakp); + break; + } + break; + + case CI_MAGICNUMBER: + if (!(ao->neg_magicnumber || go->neg_magicnumber) || + cilen != CILEN_LONG) { + orc = CONFREJ; + break; + } + GETLONG(cilong, p); +#if TRACELCP > 0 + snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " MAGICNUMBER (%lX)", cilong); + traceNdx = strlen(traceBuf); +#endif + + /* + * 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, nakp); + PUTCHAR(CILEN_LONG, nakp); + PUTLONG(cilong, nakp); + break; + } + ho->neg_magicnumber = 1; + ho->magicnumber = cilong; + break; + + + case CI_PCOMPRESSION: +#if TRACELCP > 0 + snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " PCOMPRESSION"); + traceNdx = strlen(traceBuf); +#endif + if (!ao->neg_pcompression || + cilen != CILEN_VOID) { + orc = CONFREJ; + break; + } + ho->neg_pcompression = 1; + break; + + case CI_ACCOMPRESSION: +#if TRACELCP > 0 + snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " ACCOMPRESSION"); + traceNdx = strlen(traceBuf); +#endif + if (!ao->neg_accompression || + cilen != CILEN_VOID) { + orc = CONFREJ; + break; + } + ho->neg_accompression = 1; + break; + + case CI_MRRU: +#if TRACELCP > 0 + snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " CI_MRRU"); + traceNdx = strlen(traceBuf); +#endif + orc = CONFREJ; + break; + + case CI_SSNHF: +#if TRACELCP > 0 + snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " CI_SSNHF"); + traceNdx = strlen(traceBuf); +#endif + orc = CONFREJ; + break; + + case CI_EPDISC: +#if TRACELCP > 0 + snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " CI_EPDISC"); + traceNdx = strlen(traceBuf); +#endif + orc = CONFREJ; + break; + + default: +#if TRACELCP + snprintf(&traceBuf[traceNdx], sizeof(traceBuf), " unknown %d", citype); + traceNdx = strlen(traceBuf); +#endif + orc = CONFREJ; + break; + } + + endswitch: +#if TRACELCP + if (traceNdx >= 80 - 32) { + LCPDEBUG((LOG_INFO, "lcp_reqci: rcvd%s\n", traceBuf)); + traceNdx = 0; + } +#endif + 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? */ + BCOPY(cip, rejp, 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 *nakp. + * At present there are no cases where we want to ask the + * peer to negotiate an option. + */ + + switch (rc) { + case CONFACK: + *lenp = (int)(next - inp); + break; + case CONFNAK: + /* + * Copy the Nak'd options from the nak_buffer to the caller's buffer. + */ + *lenp = (int)(nakp - nak_buffer); + BCOPY(nak_buffer, inp, *lenp); + break; + case CONFREJ: + *lenp = (int)(rejp - inp); + break; + } + +#if TRACELCP > 0 + if (traceNdx > 0) { + LCPDEBUG((LOG_INFO, "lcp_reqci: %s\n", traceBuf)); + } +#endif + LCPDEBUG((LOG_INFO, "lcp_reqci: returning CONF%s.\n", CODENAME(rc))); + return (rc); /* Return final code */ +} + + +/* + * lcp_up - LCP has come UP. + */ +static void +lcp_up(fsm *f) +{ + lcp_options *wo = &lcp_wantoptions[f->unit]; + lcp_options *ho = &lcp_hisoptions[f->unit]; + lcp_options *go = &lcp_gotoptions[f->unit]; + lcp_options *ao = &lcp_allowoptions[f->unit]; + + 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. + */ + ppp_send_config(f->unit, LWIP_MIN(ao->mru, (ho->neg_mru? ho->mru: PPP_MRU)), + (ho->neg_asyncmap? ho->asyncmap: 0xffffffffl), + ho->neg_pcompression, ho->neg_accompression); + /* + * If the asyncmap hasn't been negotiated, we really should + * set the receive asyncmap to ffffffff, but we set it to 0 + * for backwards contemptibility. + */ + ppp_recv_config(f->unit, (go->neg_mru? LWIP_MAX(wo->mru, go->mru): PPP_MRU), + (go->neg_asyncmap? go->asyncmap: 0x00000000), + go->neg_pcompression, go->neg_accompression); + + if (ho->neg_mru) { + peer_mru[f->unit] = ho->mru; + } + + lcp_echo_lowerup(f->unit); /* Enable echo messages */ + + link_established(f->unit); +} + + +/* + * lcp_down - LCP has gone DOWN. + * + * Alert other protocols. + */ +static void +lcp_down(fsm *f) +{ + lcp_options *go = &lcp_gotoptions[f->unit]; + + lcp_echo_lowerdown(f->unit); + + link_down(f->unit); + + ppp_send_config(f->unit, PPP_MRU, 0xffffffffl, 0, 0); + ppp_recv_config(f->unit, PPP_MRU, + (go->neg_asyncmap? go->asyncmap: 0x00000000), + go->neg_pcompression, go->neg_accompression); + peer_mru[f->unit] = PPP_MRU; +} + + +/* + * lcp_starting - LCP needs the lower layer up. + */ +static void +lcp_starting(fsm *f) +{ + link_required(f->unit); +} + + +/* + * lcp_finished - LCP has finished with the lower layer. + */ +static void +lcp_finished(fsm *f) +{ + link_terminated(f->unit); +} + + +#if 0 +/* + * print_string - print a readable representation of a string using + * printer. + */ +static void +print_string( char *p, int len, void (*printer) (void *, char *, ...), void *arg) +{ + int c; + + printer(arg, "\""); + for (; len > 0; --len) { + c = *p++; + if (' ' <= c && c <= '~') { + if (c == '\\' || c == '"') { + printer(arg, "\\"); + } + printer(arg, "%c", c); + } else { + switch (c) { + case '\n': + printer(arg, "\\n"); + break; + case '\r': + printer(arg, "\\r"); + break; + case '\t': + printer(arg, "\\t"); + break; + default: + printer(arg, "\\%.3o", c); + } + } + } + printer(arg, "\""); +} + + +/* + * lcp_printpkt - print the contents of an LCP packet. + */ +static char *lcp_codenames[] = { + "ConfReq", "ConfAck", "ConfNak", "ConfRej", + "TermReq", "TermAck", "CodeRej", "ProtRej", + "EchoReq", "EchoRep", "DiscReq" +}; + +static int +lcp_printpkt( u_char *p, int plen, void (*printer) (void *, char *, ...), void *arg) +{ + int code, id, len, olen; + 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 <= sizeof(lcp_codenames) / sizeof(char *)) { + 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%lx", cilong); + } + break; + case CI_AUTHTYPE: + if (olen >= CILEN_SHORT) { + p += 2; + printer(arg, "auth "); + GETSHORT(cishort, p); + switch (cishort) { + case PPP_PAP: + printer(arg, "pap"); + break; + case PPP_CHAP: + printer(arg, "chap"); + break; + default: + printer(arg, "0x%x", cishort); + } + } + break; + 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; + case CI_CALLBACK: + if (olen >= CILEN_CHAR) { + p += 2; + printer(arg, "callback "); + GETSHORT(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; + } + 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, " "); + print_string((char*)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); + p += 4; + len -= 4; + } + break; + } + + /* print the rest of the bytes in the packet */ + for (; len > 0; --len) { + GETCHAR(code, p); + printer(arg, " %.2x", code); + } + + return (int)(p - pstart); +} +#endif + +/* + * Time to shut down the link because there is nothing out there. + */ +static void +LcpLinkFailure (fsm *f) +{ + if (f->state == LS_OPENED) { + LCPDEBUG((LOG_INFO, "No response to %d echo-requests\n", lcp_echos_pending)); + LCPDEBUG((LOG_NOTICE, "Serial link appears to be disconnected.\n")); + lcp_close(f->unit, "Peer not responding"); + } +} + +/* + * Timer expired for the LCP echo requests from this process. + */ +static void +LcpEchoCheck (fsm *f) +{ + LcpSendEchoRequest (f); + + /* + * Start the timer for the next interval. + */ + LWIP_ASSERT("lcp_echo_timer_running == 0", lcp_echo_timer_running == 0); + + TIMEOUT (LcpEchoTimeout, f, lcp_echo_interval); + lcp_echo_timer_running = 1; +} + +/* + * LcpEchoTimeout - Timer expired on the LCP echo + */ +static void +LcpEchoTimeout (void *arg) +{ + if (lcp_echo_timer_running != 0) { + 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) +{ + u32_t magic; + + LWIP_UNUSED_ARG(id); + + /* Check the magic number - don't count replies from ourselves. */ + if (len < 4) { + LCPDEBUG((LOG_WARNING, "lcp: received short Echo-Reply, length %d\n", len)); + return; + } + GETLONG(magic, inp); + if (lcp_gotoptions[f->unit].neg_magicnumber && magic == lcp_gotoptions[f->unit].magicnumber) { + LCPDEBUG((LOG_WARNING, "appear to have received our own echo-reply!\n")); + return; + } + + /* Reset the number of outstanding echo frames */ + lcp_echos_pending = 0; +} + +/* + * LcpSendEchoRequest - Send an echo request frame to the peer + */ +static void +LcpSendEchoRequest (fsm *f) +{ + u32_t lcp_magic; + u_char pkt[4], *pktp; + + /* + * Detect the failure of the peer at this point. + */ + if (lcp_echo_fails != 0) { + if (lcp_echos_pending++ >= lcp_echo_fails) { + LcpLinkFailure(f); + lcp_echos_pending = 0; + } + } + + /* + * Make and send the echo request frame. + */ + if (f->state == LS_OPENED) { + lcp_magic = lcp_gotoptions[f->unit].magicnumber; + pktp = pkt; + PUTLONG(lcp_magic, pktp); + fsm_sdata(f, ECHOREQ, (u_char)(lcp_echo_number++ & 0xFF), pkt, (int)(pktp - pkt)); + } +} + +/* + * lcp_echo_lowerup - Start the timer for the LCP frame + */ + +static void +lcp_echo_lowerup (int unit) +{ + fsm *f = &lcp_fsm[unit]; + + /* Clear the parameters for generating echo frames */ + lcp_echos_pending = 0; + lcp_echo_number = 0; + lcp_echo_timer_running = 0; + + /* If a timeout interval is specified then start the timer */ + if (lcp_echo_interval != 0) { + LcpEchoCheck (f); + } +} + +/* + * lcp_echo_lowerdown - Stop the timer for the LCP frame + */ + +static void +lcp_echo_lowerdown (int unit) +{ + fsm *f = &lcp_fsm[unit]; + + if (lcp_echo_timer_running != 0) { + UNTIMEOUT (LcpEchoTimeout, f); + lcp_echo_timer_running = 0; + } +} + +#endif /* PPP_SUPPORT */ |