| /* |
| * 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 */ |