ipcp.c
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上传日期:2007-01-17
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- /* ipcp.c - PPP IP Control Protocol */
- /* Copyright 1995 Wind River Systems, Inc. */
- #include "copyright_wrs.h"
- /*
- * 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.
- */
- /*
- modification history
- --------------------
- 01e,16jun95,dzb header file consolidation.
- 01d,08jun95,dzb made LOG_NOTICE message printed even w/o debug option.
- 01c,07feb95,dab die() if IP address reject (SPR #4038).
- 01b,16jan95,dab removed ipcp_script call. removed pathname.h inclusion.
- 01a,21dec94,dab VxWorks port - first WRS version.
- +dzb added: path for ppp header files, WRS copyright.
- */
- #include <vxWorks.h>
- #include <stdio.h>
- #include <string.h>
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include "pppLib.h"
- /*
- * Callbacks for fsm code. (CI = Configuration Information)
- */
- static void ipcp_resetci __ARGS((fsm *)); /* Reset our CI */
- static int ipcp_cilen __ARGS((fsm *)); /* Return length of our CI */
- static void ipcp_addci __ARGS((fsm *, u_char *, int *)); /* Add our CI */
- static int ipcp_ackci __ARGS((fsm *, u_char *, int)); /* Peer ack'd our CI */
- static int ipcp_nakci __ARGS((fsm *, u_char *, int)); /* Peer nak'd our CI */
- static int ipcp_rejci __ARGS((fsm *, u_char *, int)); /* Peer rej'd our CI */
- static int ipcp_reqci __ARGS((fsm *, u_char *, int *, int)); /* Rcv CI */
- static void ipcp_up __ARGS((fsm *)); /* We're UP */
- static void ipcp_down __ARGS((fsm *)); /* We're DOWN */
- static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
- ipcp_resetci, /* Reset our Configuration Information */
- ipcp_cilen, /* Length of our Configuration Information */
- ipcp_addci, /* Add our Configuration Information */
- ipcp_ackci, /* ACK our Configuration Information */
- ipcp_nakci, /* NAK our Configuration Information */
- ipcp_rejci, /* Reject our Configuration Information */
- ipcp_reqci, /* Request peer's Configuration Information */
- ipcp_up, /* Called when fsm reaches OPENED state */
- ipcp_down, /* Called when fsm leaves OPENED state */
- NULL, /* Called when we want the lower layer up */
- NULL, /* Called when we want the lower layer down */
- NULL, /* Called when Protocol-Reject received */
- NULL, /* Retransmission is necessary */
- NULL, /* Called to handle protocol-specific codes */
- "IPCP" /* String name of protocol */
- };
- /*
- * Lengths of configuration options.
- */
- #define CILEN_VOID 2
- #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */
- #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */
- #define CILEN_ADDR 6 /* new-style single address option */
- #define CILEN_ADDRS 10 /* old-style dual address option */
- #define CODENAME(x) ((x) == CONFACK ? "ACK" :
- (x) == CONFNAK ? "NAK" : "REJ")
- /*
- * Make a string representation of a network IP address.
- */
- char *
- ip_ntoa(ipaddr)
- u_long ipaddr;
- {
- static char b[64];
- ipaddr = ntohl(ipaddr);
- sprintf(b, "%d.%d.%d.%d",
- (u_char)(ipaddr >> 24),
- (u_char)(ipaddr >> 16),
- (u_char)(ipaddr >> 8),
- (u_char)(ipaddr));
- return b;
- }
- /*
- * ipcp_init - Initialize IPCP.
- */
- void
- ipcp_init(unit)
- int unit;
- {
- fsm *f = &ppp_if[unit]->ipcp_fsm;
- ipcp_options *wo = &ppp_if[unit]->ipcp_wantoptions;
- ipcp_options *ao = &ppp_if[unit]->ipcp_allowoptions;
- f->unit = unit;
- f->protocol = IPCP;
- f->callbacks = &ipcp_callbacks;
- fsm_init(&ppp_if[unit]->ipcp_fsm);
- wo->neg_addr = 1;
- wo->old_addrs = 0;
- wo->ouraddr = 0;
- wo->hisaddr = 0;
- wo->neg_vj = 1;
- wo->old_vj = 0;
- wo->vj_protocol = IPCP_VJ_COMP;
- wo->maxslotindex = MAX_STATES - 1; /* really max index */
- wo->cflag = 1;
- /* max slots and slot-id compression are currently hardwired in */
- /* ppp_if.c to 16 and 1, this needs to be changed (among other */
- /* things) gmc */
- ao->neg_addr = 1;
- ao->neg_vj = 1;
- ao->maxslotindex = MAX_STATES - 1;
- ao->cflag = 1;
- }
- /*
- * ipcp_open - IPCP is allowed to come up.
- */
- void
- ipcp_open(unit)
- int unit;
- {
- fsm_open(&ppp_if[unit]->ipcp_fsm);
- }
- /*
- * ipcp_close - Take IPCP down.
- */
- void
- ipcp_close(unit)
- int unit;
- {
- fsm_close(&ppp_if[unit]->ipcp_fsm);
- /*
- * NB
- * Since the only NCP supported by VxWorks is IPCP, this routine should
- * also take down the entire link if IPCP is going down... Thus,
- * an LCP should occur so that an LCP terminate request is sent to the
- * peer. This is *not* usual behavior, especially in regard to the
- * RFC's protocol specification, but it makes sense for VxWorks.
- * Users should not mind, since the link is useless without IPCP.
- * -dzb
- */
- die(unit, 1);
- }
- /*
- * ipcp_lowerup - The lower layer is up.
- */
- void
- ipcp_lowerup(unit)
- int unit;
- {
- fsm_lowerup(&ppp_if[unit]->ipcp_fsm);
- }
- /*
- * ipcp_lowerdown - The lower layer is down.
- */
- void
- ipcp_lowerdown(unit)
- int unit;
- {
- fsm_lowerdown(&ppp_if[unit]->ipcp_fsm);
- }
- /*
- * ipcp_input - Input IPCP packet.
- */
- void
- ipcp_input(unit, p, len)
- int unit;
- u_char *p;
- int len;
- {
- fsm_input(&ppp_if[unit]->ipcp_fsm, p, len);
- }
- /*
- * ipcp_protrej - A Protocol-Reject was received for IPCP.
- *
- * Pretend the lower layer went down, so we shut up.
- */
- void
- ipcp_protrej(unit)
- int unit;
- {
- fsm_lowerdown(&ppp_if[unit]->ipcp_fsm);
- }
- /*
- * ipcp_resetci - Reset our CI.
- */
- static void
- ipcp_resetci(f)
- fsm *f;
- {
- ipcp_options *wo = &ppp_if[f->unit]->ipcp_wantoptions;
- wo->req_addr = wo->neg_addr && ppp_if[f->unit]->ipcp_allowoptions.neg_addr;
- if (wo->ouraddr == 0)
- wo->accept_local = 1;
- if (wo->hisaddr == 0)
- wo->accept_remote = 1;
- ppp_if[f->unit]->ipcp_gotoptions = *wo;
- ppp_if[f->unit]->cis_received = 0;
- }
- /*
- * ipcp_cilen - Return length of our CI.
- */
- static int
- ipcp_cilen(f)
- fsm *f;
- {
- ipcp_options *go = &ppp_if[f->unit]->ipcp_gotoptions;
- #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
- #define LENCIADDR(neg, old) (neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 0)
- return (LENCIADDR(go->neg_addr, go->old_addrs) +
- LENCIVJ(go->neg_vj, go->old_vj));
- }
- /*
- * ipcp_addci - Add our desired CIs to a packet.
- */
- static void
- ipcp_addci(f, ucp, lenp)
- fsm *f;
- u_char *ucp;
- int *lenp;
- {
- ipcp_options *wo = &ppp_if[f->unit]->ipcp_wantoptions;
- ipcp_options *go = &ppp_if[f->unit]->ipcp_gotoptions;
- ipcp_options *ho = &ppp_if[f->unit]->ipcp_hisoptions;
- int len = *lenp;
- #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag)
- if (neg) {
- int vjlen = old? CILEN_COMPRESS : CILEN_VJ;
- if (len >= vjlen) {
- PUTCHAR(opt, ucp);
- PUTCHAR(vjlen, ucp);
- PUTSHORT(val, ucp);
- if (!old) {
- PUTCHAR(maxslotindex, ucp);
- PUTCHAR(cflag, ucp);
- }
- len -= vjlen;
- } else
- neg = 0;
- }
- #define ADDCIADDR(opt, neg, old, val1, val2)
- if (neg) {
- int addrlen = (old? CILEN_ADDRS: CILEN_ADDR);
- if (len >= addrlen) {
- u_long l;
- PUTCHAR(opt, ucp);
- PUTCHAR(addrlen, ucp);
- l = ntohl(val1);
- PUTLONG(l, ucp);
- if (old) {
- l = ntohl(val2);
- PUTLONG(l, ucp);
- }
- len -= addrlen;
- } else
- neg = 0;
- }
- /*
- * First see if we want to change our options to the old
- * forms because we have received old forms from the peer.
- */
- if (wo->neg_addr && !go->neg_addr && !go->old_addrs) {
- /* use the old style of address negotiation */
- go->neg_addr = 1;
- go->old_addrs = 1;
- }
- if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
- /* try an older style of VJ negotiation */
- if (ppp_if[f->unit]->cis_received == 0) {
- /* keep trying the new style until we see some CI from the peer */
- go->neg_vj = 1;
- } else {
- /* use the old style only if the peer did */
- if (ho->neg_vj && ho->old_vj) {
- go->neg_vj = 1;
- go->old_vj = 1;
- go->vj_protocol = ho->vj_protocol;
- }
- }
- }
- ADDCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
- go->old_addrs, go->ouraddr, go->hisaddr);
- ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
- go->maxslotindex, go->cflag);
- *lenp -= len;
- }
- /*
- * ipcp_ackci - Ack our CIs.
- *
- * Returns:
- * 0 - Ack was bad.
- * 1 - Ack was good.
- */
- static int
- ipcp_ackci(f, p, len)
- fsm *f;
- u_char *p;
- int len;
- {
- ipcp_options *go = &ppp_if[f->unit]->ipcp_gotoptions;
- u_short cilen, citype, cishort;
- u_long cilong;
- u_char cimaxslotindex, cicflag;
- /*
- * 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 ACKCIVJ(opt, neg, val, old, maxslotindex, cflag)
- if (neg) {
- int vjlen = old? CILEN_COMPRESS : CILEN_VJ;
- if ((len -= vjlen) < 0)
- goto bad;
- GETCHAR(citype, p);
- GETCHAR(cilen, p);
- if (cilen != vjlen ||
- citype != opt)
- goto bad;
- GETSHORT(cishort, p);
- if (cishort != val)
- goto bad;
- if (!old) {
- GETCHAR(cimaxslotindex, p);
- if (cimaxslotindex != maxslotindex)
- goto bad;
- GETCHAR(cicflag, p);
- if (cicflag != cflag)
- goto bad;
- }
- }
- #define ACKCIADDR(opt, neg, old, val1, val2)
- if (neg) {
- int addrlen = (old? CILEN_ADDRS: CILEN_ADDR);
- u_long l;
- if ((len -= addrlen) < 0)
- goto bad;
- GETCHAR(citype, p);
- GETCHAR(cilen, p);
- if (cilen != addrlen ||
- citype != opt)
- goto bad;
- GETLONG(l, p);
- cilong = htonl(l);
- if (val1 != cilong)
- goto bad;
- if (old) {
- GETLONG(l, p);
- cilong = htonl(l);
- if (val2 != cilong)
- goto bad;
- }
- }
- ACKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
- go->old_addrs, go->ouraddr, go->hisaddr);
- ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
- go->maxslotindex, go->cflag);
- /*
- * If there are any remaining CIs, then this packet is bad.
- */
- if (len != 0)
- goto bad;
- return (1);
- bad:
- IPCPDEBUG((LOG_INFO, "ipcp_ackci: received bad Ack!"));
- return (0);
- }
- /*
- * ipcp_nakci - Peer has sent a NAK for some of our CIs.
- * This should not modify any state if the Nak is bad
- * or if IPCP is in the OPENED state.
- *
- * Returns:
- * 0 - Nak was bad.
- * 1 - Nak was good.
- */
- static int
- ipcp_nakci(f, p, len)
- fsm *f;
- u_char *p;
- int len;
- {
- ipcp_options *go = &ppp_if[f->unit]->ipcp_gotoptions;
- u_char cimaxslotindex = 0, cicflag = 0;
- u_char citype, cilen, *next;
- u_short cishort;
- u_long ciaddr1, ciaddr2, l;
- ipcp_options no; /* options we've seen Naks for */
- ipcp_options try; /* options to request next time */
- BZERO((char *)&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 NAKCIADDR(opt, neg, old, code)
- if (go->neg &&
- len >= (cilen = (old? CILEN_ADDRS: CILEN_ADDR)) &&
- p[1] == cilen &&
- p[0] == opt) {
- len -= cilen;
- INCPTR(2, p);
- GETLONG(l, p);
- ciaddr1 = htonl(l);
- if (old) {
- GETLONG(l, p);
- ciaddr2 = htonl(l);
- no.old_addrs = 1;
- } else
- ciaddr2 = 0;
- no.neg = 1;
- code
- }
- #define NAKCIVJ(opt, neg, code)
- if (go->neg &&
- ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) &&
- len >= cilen &&
- p[0] == opt) {
- len -= cilen;
- INCPTR(2, p);
- GETSHORT(cishort, p);
- no.neg = 1;
- code
- }
- /*
- * Accept the peer's idea of {our,his} address, if different
- * from our idea, only if the accept_{local,remote} flag is set.
- */
- NAKCIADDR(CI_ADDR, neg_addr, go->old_addrs,
- if (go->accept_local && ciaddr1) { /* Do we know our address? */
- try.ouraddr = ciaddr1;
- IPCPDEBUG((LOG_INFO, "local IP address %s",
- ip_ntoa(ciaddr1)));
- }
- if (go->accept_remote && ciaddr2) { /* Does he know his? */
- try.hisaddr = ciaddr2;
- IPCPDEBUG((LOG_INFO, "remote IP address %s",
- ip_ntoa(ciaddr2)));
- }
- );
- /*
- * Accept the peer's value of maxslotindex provided that it
- * is less than what we asked for. Turn off slot-ID compression
- * if the peer wants. Send old-style compress-type option if
- * the peer wants.
- */
- NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
- if (cilen == CILEN_VJ) {
- GETCHAR(cimaxslotindex, p);
- GETCHAR(cicflag, p);
- if (cishort == IPCP_VJ_COMP) {
- try.old_vj = 0;
- if (cimaxslotindex < go->maxslotindex)
- try.maxslotindex = cimaxslotindex;
- if (!cicflag)
- try.cflag = 0;
- } else {
- try.neg_vj = 0;
- }
- } else {
- if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
- try.old_vj = 1;
- try.vj_protocol = cishort;
- } else {
- try.neg_vj = 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 they want to negotiate about IP addresses, we comply.
- * If they want us to ask for compression, we refuse.
- */
- while (len > CILEN_VOID) {
- GETCHAR(citype, p);
- GETCHAR(cilen, p);
- if( (len -= cilen) < 0 )
- goto bad;
- next = p + cilen - 2;
- switch (citype) {
- case CI_COMPRESSTYPE:
- if (go->neg_vj || no.neg_vj ||
- (cilen != CILEN_VJ && cilen != CILEN_COMPRESS))
- goto bad;
- no.neg_vj = 1;
- break;
- case CI_ADDRS:
- if ((go->neg_addr && go->old_addrs) || no.old_addrs
- || cilen != CILEN_ADDRS)
- goto bad;
- try.neg_addr = 1;
- try.old_addrs = 1;
- GETLONG(l, p);
- ciaddr1 = htonl(l);
- if (ciaddr1 && go->accept_local)
- try.ouraddr = ciaddr1;
- GETLONG(l, p);
- ciaddr2 = htonl(l);
- if (ciaddr2 && go->accept_remote)
- try.hisaddr = ciaddr2;
- no.old_addrs = 1;
- break;
- case CI_ADDR:
- if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR)
- goto bad;
- try.neg_addr = 1;
- try.old_addrs = 0;
- GETLONG(l, p);
- ciaddr1 = htonl(l);
- if (ciaddr1 && go->accept_local)
- try.ouraddr = ciaddr1;
- no.neg_addr = 1;
- break;
- default:
- goto bad;
- }
- 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 != OPENED)
- *go = try;
- return 1;
- bad:
- IPCPDEBUG((LOG_INFO, "ipcp_nakci: received bad Nak!"));
- return 0;
- }
- /*
- * ipcp_rejci - Reject some of our CIs.
- */
- static int
- ipcp_rejci(f, p, len)
- fsm *f;
- u_char *p;
- int len;
- {
- ipcp_options *go = &ppp_if[f->unit]->ipcp_gotoptions;
- u_char cimaxslotindex, ciflag, cilen;
- u_short cishort;
- u_long cilong;
- ipcp_options try; /* options to request next time */
- try = *go;
- /*
- * Bring down link if peer rejects the IPCP address configuration option,
- * since if the IP address can't be negotiated then the link is useless.
- */
- /*
- * 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 REJCIADDR(opt, neg, old, val1, val2)
- if (go->neg &&
- len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) &&
- p[1] == cilen &&
- p[0] == opt) {
- u_long l;
- die(f->unit, 1); /* not to protocol spec. see note in ipcp_close() */
- len -= cilen;
- INCPTR(2, p);
- GETLONG(l, p);
- cilong = htonl(l);
- /* Check rejected value. */
- if (cilong != val1)
- goto bad;
- if (old) {
- GETLONG(l, p);
- cilong = htonl(l);
- /* Check rejected value. */
- if (cilong != val2)
- goto bad;
- }
- try.neg = 0;
- }
- #define REJCIVJ(opt, neg, val, old, maxslot, cflag)
- if (go->neg &&
- p[1] == (old? CILEN_COMPRESS : CILEN_VJ) &&
- len >= p[1] &&
- p[0] == opt) {
- len -= p[1];
- INCPTR(2, p);
- GETSHORT(cishort, p);
- /* Check rejected value. */
- if (cishort != val)
- goto bad;
- if (!old) {
- GETCHAR(cimaxslotindex, p);
- if (cimaxslotindex != maxslot)
- goto bad;
- GETCHAR(ciflag, p);
- if (ciflag != cflag)
- goto bad;
- }
- try.neg = 0;
- }
- REJCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr,
- go->old_addrs, go->ouraddr, go->hisaddr);
- REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
- go->maxslotindex, go->cflag);
- /*
- * If there are any remaining CIs, then this packet is bad.
- */
- if (len != 0)
- goto bad;
- /*
- * Now we can update state.
- */
- if (f->state != OPENED)
- *go = try;
- return 1;
- bad:
- IPCPDEBUG((LOG_INFO, "ipcp_rejci: received bad Reject!"));
- return 0;
- }
- /*
- * ipcp_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
- ipcp_reqci(f, inp, len, reject_if_disagree)
- fsm *f;
- u_char *inp; /* Requested CIs */
- int *len; /* Length of requested CIs */
- int reject_if_disagree;
- {
- ipcp_options *wo = &ppp_if[f->unit]->ipcp_wantoptions;
- ipcp_options *ho = &ppp_if[f->unit]->ipcp_hisoptions;
- ipcp_options *ao = &ppp_if[f->unit]->ipcp_allowoptions;
- ipcp_options *go = &ppp_if[f->unit]->ipcp_gotoptions;
- u_char *cip, *next; /* Pointer to current and next CIs */
- u_short cilen, citype; /* Parsed len, type */
- u_short cishort; /* Parsed short value */
- u_long tl, ciaddr1, ciaddr2;/* Parsed address values */
- int rc = CONFACK; /* Final packet return code */
- int orc; /* Individual option return code */
- u_char *p; /* Pointer to next char to parse */
- u_char *ucp = inp; /* Pointer to current output char */
- int l = *len; /* Length left */
- u_char maxslotindex, cflag;
- /*
- * Reset all his options.
- */
- BZERO((char *)ho, sizeof(*ho));
-
- /*
- * Process all his options.
- */
- next = 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? */
- IPCPDEBUG((LOG_INFO, "ipcp_reqci: bad CI length!"));
- orc = CONFREJ; /* Reject bad CI */
- cilen = l; /* Reject till end of packet */
- l = 0; /* Don't loop again */
- 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_ADDRS:
- IPCPDEBUG((LOG_INFO, "ipcp: received ADDRS "));
- if (!ao->neg_addr ||
- cilen != CILEN_ADDRS) { /* Check CI length */
- orc = CONFREJ; /* Reject CI */
- break;
- }
- /*
- * If he has no address, or if we both have his address but
- * disagree about it, then NAK it with our idea.
- * In particular, if we don't know his address, but he does,
- * then accept it.
- */
- GETLONG(tl, p); /* Parse source address (his) */
- ciaddr1 = htonl(tl);
- IPCPDEBUG((LOG_INFO, "(%s:", ip_ntoa(ciaddr1)));
- if (ciaddr1 != wo->hisaddr
- && (ciaddr1 == 0 || !wo->accept_remote)) {
- orc = CONFNAK;
- if (!reject_if_disagree) {
- DECPTR(sizeof (long), p);
- tl = ntohl(wo->hisaddr);
- PUTLONG(tl, p);
- }
- }
- /*
- * If he doesn't know our address, or if we both have our address
- * but disagree about it, then NAK it with our idea.
- */
- GETLONG(tl, p); /* Parse desination address (ours) */
- ciaddr2 = htonl(tl);
- IPCPDEBUG((LOG_INFO, "%s)", ip_ntoa(ciaddr2)));
- if (ciaddr2 != wo->ouraddr) {
- if (ciaddr2 == 0 || !wo->accept_local) {
- orc = CONFNAK;
- if (!reject_if_disagree) {
- DECPTR(sizeof (long), p);
- tl = ntohl(wo->ouraddr);
- PUTLONG(tl, p);
- }
- } else {
- go->ouraddr = ciaddr2; /* accept peer's idea */
- }
- }
- ho->neg_addr = 1;
- ho->old_addrs = 1;
- ho->hisaddr = ciaddr1;
- ho->ouraddr = ciaddr2;
- break;
- case CI_ADDR:
- IPCPDEBUG((LOG_INFO, "ipcp: received ADDR "));
- if (!ao->neg_addr ||
- cilen != CILEN_ADDR) { /* Check CI length */
- orc = CONFREJ; /* Reject CI */
- break;
- }
- /*
- * If he has no address, or if we both have his address but
- * disagree about it, then NAK it with our idea.
- * In particular, if we don't know his address, but he does,
- * then accept it.
- */
- GETLONG(tl, p); /* Parse source address (his) */
- ciaddr1 = htonl(tl);
- IPCPDEBUG((LOG_INFO, "(%s)", ip_ntoa(ciaddr1)));
- if (ciaddr1 != wo->hisaddr
- && (ciaddr1 == 0 || !wo->accept_remote)) {
- orc = CONFNAK;
- if (!reject_if_disagree) {
- DECPTR(sizeof (long), p);
- tl = ntohl(wo->hisaddr);
- PUTLONG(tl, p);
- }
- }
- ho->neg_addr = 1;
- ho->hisaddr = ciaddr1;
- break;
-
- case CI_COMPRESSTYPE:
- IPCPDEBUG((LOG_INFO, "ipcp: received COMPRESSTYPE "));
- if (!ao->neg_vj ||
- (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
- orc = CONFREJ;
- break;
- }
- GETSHORT(cishort, p);
- IPCPDEBUG((LOG_INFO, "(%d)", cishort));
- if (!(cishort == IPCP_VJ_COMP ||
- (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
- orc = CONFREJ;
- break;
- }
- ho->neg_vj = 1;
- ho->vj_protocol = cishort;
- if (cilen == CILEN_VJ) {
- GETCHAR(maxslotindex, p);
- if (maxslotindex > ao->maxslotindex) {
- orc = CONFNAK;
- if (!reject_if_disagree){
- DECPTR(1, p);
- PUTCHAR(ao->maxslotindex, p);
- }
- }
- GETCHAR(cflag, p);
- if (cflag && !ao->cflag) {
- orc = CONFNAK;
- if (!reject_if_disagree){
- DECPTR(1, p);
- PUTCHAR(wo->cflag, p);
- }
- }
- ho->maxslotindex = maxslotindex;
- ho->cflag = wo->cflag;
- } else {
- ho->old_vj = 1;
- ho->maxslotindex = MAX_STATES - 1;
- ho->cflag = 1;
- }
- break;
- default:
- orc = CONFREJ;
- break;
- }
- endswitch:
- IPCPDEBUG((LOG_INFO, " (%s)", CODENAME(orc)));
- 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? */
- orc = CONFREJ; /* Get tough if so */
- else {
- if (rc == CONFREJ) /* Rejecting prior CI? */
- continue; /* Don't send this one */
- if (rc == CONFACK) { /* Ack'd all prior CIs? */
- rc = CONFNAK; /* Not anymore... */
- ucp = inp; /* Backup */
- }
- }
- }
- if (orc == CONFREJ && /* Reject this CI */
- rc != CONFREJ) { /* but no prior ones? */
- rc = CONFREJ;
- ucp = inp; /* Backup */
- }
- /* Need to move CI? */
- if (ucp != cip)
- BCOPY((char *)cip, (char *)ucp, cilen); /* Move it */
- /* Update output pointer */
- INCPTR(cilen, ucp);
- }
- /*
- * If we aren't rejecting this packet, and we want to negotiate
- * their address, and they didn't send their address, then we
- * send a NAK with a CI_ADDR option appended. We assume the
- * input buffer is long enough that we can append the extra
- * option safely.
- */
- if (rc != CONFREJ && !ho->neg_addr &&
- wo->req_addr && !reject_if_disagree) {
- if (rc == CONFACK) {
- rc = CONFNAK;
- ucp = inp; /* reset pointer */
- wo->req_addr = 0; /* don't ask again */
- }
- PUTCHAR(CI_ADDR, ucp);
- PUTCHAR(CILEN_ADDR, ucp);
- tl = ntohl(wo->hisaddr);
- PUTLONG(tl, ucp);
- }
- *len = ucp - inp; /* Compute output length */
- IPCPDEBUG((LOG_INFO, "ipcp: returning Configure-%s", CODENAME(rc)));
- return (rc); /* Return final code */
- }
- /*
- * ipcp_up - IPCP has come UP.
- *
- * Configure the IP network interface appropriately and bring it up.
- */
- static void
- ipcp_up(f)
- fsm *f;
- {
- u_long mask;
- ipcp_options *ho = &ppp_if[f->unit]->ipcp_hisoptions;
- ipcp_options *go = &ppp_if[f->unit]->ipcp_gotoptions;
- IPCPDEBUG((LOG_INFO, "ipcp: up"));
- go->default_route = 0;
- go->proxy_arp = 0;
- /*
- * We must have a non-zero IP address for both ends of the link.
- */
- if (!ho->neg_addr)
- ho->hisaddr = ppp_if[f->unit]->ipcp_wantoptions.hisaddr;
- if (ho->hisaddr == 0) {
- syslog(LOG_ERR, "Could not determine remote IP address");
- ipcp_close(f->unit);
- return;
- }
- if (go->ouraddr == 0) {
- syslog(LOG_ERR, "Could not determine local IP address");
- ipcp_close(f->unit);
- return;
- }
- /*
- * Check that the peer is allowed to use the IP address it wants.
- */
- if (!auth_ip_addr(f->unit, ho->hisaddr)) {
- syslog(LOG_ERR, "Peer is not authorized to use remote address %s",
- ip_ntoa(ho->hisaddr));
- ipcp_close(f->unit);
- return;
- }
- syslog (LOG_NOTICE, "local IP address %s", ip_ntoa(go->ouraddr));
- syslog (LOG_NOTICE, "remote IP address %s", ip_ntoa(ho->hisaddr));
- /*
- * Set IP addresses and (if specified) netmask.
- */
- mask = GetMask(go->ouraddr);
- if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
- IPCPDEBUG((LOG_WARNING, "sifaddr failed"));
- ipcp_close(f->unit);
- return;
- }
- /* set tcp compression */
- sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
- /* bring the interface up for IP */
- if (!sifup(f->unit)) {
- IPCPDEBUG((LOG_WARNING, "sifup failed"));
- ipcp_close(f->unit);
- return;
- }
- /* assign a default route through the interface if required */
- if (ppp_if[f->unit]->ipcp_wantoptions.default_route)
- if (sifdefaultroute(f->unit, ho->hisaddr))
- go->default_route = 1;
- /* Make a proxy ARP entry if requested. */
- if (ppp_if[f->unit]->ipcp_wantoptions.proxy_arp)
- if (sifproxyarp(f->unit, ho->hisaddr))
- go->proxy_arp = 1;
- }
- /*
- * ipcp_down - IPCP has gone DOWN.
- *
- * Take the IP network interface down, clear its addresses
- * and delete routes through it.
- */
- static void
- ipcp_down(f)
- fsm *f;
- {
- u_long ouraddr, hisaddr;
- IPCPDEBUG((LOG_INFO, "ipcp: down"));
- ouraddr = ppp_if[f->unit]->ipcp_gotoptions.ouraddr;
- hisaddr = ppp_if[f->unit]->ipcp_hisoptions.hisaddr;
- if (ppp_if[f->unit]->ipcp_gotoptions.proxy_arp)
- cifproxyarp(f->unit, hisaddr);
- if (ppp_if[f->unit]->ipcp_gotoptions.default_route)
- cifdefaultroute(f->unit, hisaddr);
- sifdown(f->unit);
- cifaddr(f->unit, ouraddr, hisaddr);
- }
- #ifdef notyet
- /*
- * ipcp_script - Execute a script with arguments
- * interface-name tty-name speed local-IP remote-IP.
- */
- static void
- ipcp_script(f, script)
- fsm *f;
- char *script;
- {
- char strspeed[32], strlocal[32], strremote[32];
- char *argv[8];
- sprintf(strspeed, "%d", ppp_if[f->unit]->baud_rate);
- strcpy(strlocal, ip_ntoa(ppp_if[f->unit]->ipcp_gotoptions.ouraddr));
- strcpy(strremote, ip_ntoa(ppp_if[f->unit]->ipcp_hisoptions.hisaddr));
- argv[0] = script;
- argv[1] = ppp_if[f->unit]->ifname;
- argv[2] = ppp_if[f->unit]->devname;
- argv[3] = strspeed;
- argv[4] = strlocal;
- argv[5] = strremote;
- argv[6] = NULL;
- run_program(script, argv, 0);
- }
- #endif /* notyet */
- /*
- * ipcp_printpkt - print the contents of an IPCP packet.
- */
- char *ipcp_codenames[] = {
- "ConfReq", "ConfAck", "ConfNak", "ConfRej",
- "TermReq", "TermAck", "CodeRej"
- };
- int
- ipcp_printpkt(p, plen, printer, arg)
- u_char *p;
- int plen;
- void (*printer)();
- void *arg;
- {
- int code, id, len, olen;
- u_char *pstart, *optend;
- u_short cishort;
- u_long 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(ipcp_codenames) / sizeof(char *))
- printer(arg, " %s", ipcp_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_ADDRS:
- if (olen == CILEN_ADDRS) {
- p += 2;
- GETLONG(cilong, p);
- printer(arg, "addrs %s", ip_ntoa(htonl(cilong)));
- GETLONG(cilong, p);
- printer(arg, " %s", ip_ntoa(htonl(cilong)));
- }
- break;
- case CI_COMPRESSTYPE:
- if (olen >= CILEN_COMPRESS) {
- p += 2;
- GETSHORT(cishort, p);
- printer(arg, "compress ");
- switch (cishort) {
- case IPCP_VJ_COMP:
- printer(arg, "VJ");
- break;
- case IPCP_VJ_COMP_OLD:
- printer(arg, "old-VJ");
- break;
- default:
- printer(arg, "0x%x", cishort);
- }
- }
- break;
- case CI_ADDR:
- if (olen == CILEN_ADDR) {
- p += 2;
- GETLONG(cilong, p);
- printer(arg, "addr %s", ip_ntoa(htonl(cilong)));
- }
- break;
- }
- while (p < optend) {
- GETCHAR(code, p);
- printer(arg, " %.2x", code);
- }
- printer(arg, ">");
- }
- break;
- }
- /* print the rest of the bytes in the packet */
- for (; len > 0; --len) {
- GETCHAR(code, p);
- printer(arg, " %.2x", code);
- }
- return p - pstart;
- }