diff options
Diffstat (limited to 'usr.sbin/pppd/ipcp.c')
| -rw-r--r-- | usr.sbin/pppd/ipcp.c | 1531 |
1 files changed, 0 insertions, 1531 deletions
diff --git a/usr.sbin/pppd/ipcp.c b/usr.sbin/pppd/ipcp.c deleted file mode 100644 index 3369757aab7b2..0000000000000 --- a/usr.sbin/pppd/ipcp.c +++ /dev/null @@ -1,1531 +0,0 @@ -/* - * ipcp.c - PPP IP Control Protocol. - * - * Copyright (c) 1989 Carnegie Mellon University. - * All rights reserved. - * - * Redistribution and use in source and binary forms are permitted - * provided that the above copyright notice and this paragraph are - * duplicated in all such forms and that any documentation, - * advertising materials, and other materials related to such - * distribution and use acknowledge that the software was developed - * by Carnegie Mellon University. The name of the - * University may not be used to endorse or promote products derived - * from this software without specific prior written permission. - * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED - * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. - */ - -#ifndef lint -static char rcsid[] = "$FreeBSD$"; -#endif - -/* - * TODO: - */ - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <syslog.h> -#include <netdb.h> -#include <sys/param.h> -#include <sys/types.h> -#include <sys/socket.h> -#include <netinet/in.h> - -#include "pppd.h" -#include "fsm.h" -#include "ipcp.h" -#include "pathnames.h" - -/* global vars */ -ipcp_options ipcp_wantoptions[NUM_PPP]; /* Options that we want to request */ -ipcp_options ipcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */ -ipcp_options ipcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */ -ipcp_options ipcp_hisoptions[NUM_PPP]; /* Options that we ack'd */ - -/* local vars */ -static int cis_received[NUM_PPP]; /* # Conf-Reqs received */ -static int default_route_set[NUM_PPP]; /* Have set up a default route */ -static int proxy_arp_set[NUM_PPP]; /* Have created proxy arp entry */ - -/* - * Callbacks for fsm code. (CI = Configuration Information) - */ -static void ipcp_resetci(fsm *); /* Reset our CI */ -static int ipcp_cilen(fsm *); /* Return length of our CI */ -static void ipcp_addci(fsm *, u_char *, int *); /* Add our CI */ -static int ipcp_ackci(fsm *, u_char *, int); /* Peer ack'd our CI */ -static int ipcp_nakci(fsm *, u_char *, int); /* Peer nak'd our CI */ -static int ipcp_rejci(fsm *, u_char *, int); /* Peer rej'd our CI */ -static int ipcp_reqci(fsm *, u_char *, int *, int); /* Rcv CI */ -static void ipcp_up(fsm *); /* We're UP */ -static void ipcp_down(fsm *); /* We're DOWN */ -static void ipcp_script(fsm *, char *); /* Run an up/down script */ -static void ipcp_finished(fsm *); /* Don't need lower layer */ - -fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */ - -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 */ - ipcp_finished, /* 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 */ -}; - -/* - * Protocol entry points from main code. - */ -static void ipcp_init(int); -static void ipcp_open(int); -static void ipcp_close(int, char *); -static void ipcp_lowerup(int); -static void ipcp_lowerdown(int); -static void ipcp_input(int, u_char *, int); -static void ipcp_protrej(int); -static int ipcp_printpkt(u_char *, int, - void (*) (void *, char *, ...), void *); -static void ip_check_options(void); -static int ip_demand_conf(int); -static int ip_active_pkt(u_char *, int); - -struct protent ipcp_protent = { - PPP_IPCP, - ipcp_init, - ipcp_input, - ipcp_protrej, - ipcp_lowerup, - ipcp_lowerdown, - ipcp_open, - ipcp_close, - ipcp_printpkt, - NULL, - 1, - "IPCP", - ip_check_options, - ip_demand_conf, - ip_active_pkt -}; - -static void ipcp_clear_addrs(int); - -/* - * 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_int32_t 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. - */ -static void -ipcp_init(unit) - int unit; -{ - fsm *f = &ipcp_fsm[unit]; - ipcp_options *wo = &ipcp_wantoptions[unit]; - ipcp_options *ao = &ipcp_allowoptions[unit]; - - f->unit = unit; - f->protocol = PPP_IPCP; - f->callbacks = &ipcp_callbacks; - fsm_init(&ipcp_fsm[unit]); - - memset(wo, 0, sizeof(*wo)); - memset(ao, 0, sizeof(*ao)); - - wo->neg_addr = 1; - wo->neg_vj = 1; - 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; - - /* - * XXX These control whether the user may use the proxyarp - * and defaultroute options. - */ - ao->proxy_arp = 1; - ao->default_route = 1; -} - - -/* - * ipcp_open - IPCP is allowed to come up. - */ -static void -ipcp_open(unit) - int unit; -{ - fsm_open(&ipcp_fsm[unit]); -} - - -/* - * ipcp_close - Take IPCP down. - */ -static void -ipcp_close(unit, reason) - int unit; - char *reason; -{ - fsm_close(&ipcp_fsm[unit], reason); -} - - -/* - * ipcp_lowerup - The lower layer is up. - */ -static void -ipcp_lowerup(unit) - int unit; -{ - fsm_lowerup(&ipcp_fsm[unit]); -} - - -/* - * ipcp_lowerdown - The lower layer is down. - */ -static void -ipcp_lowerdown(unit) - int unit; -{ - fsm_lowerdown(&ipcp_fsm[unit]); -} - - -/* - * ipcp_input - Input IPCP packet. - */ -static void -ipcp_input(unit, p, len) - int unit; - u_char *p; - int len; -{ - fsm_input(&ipcp_fsm[unit], p, len); -} - - -/* - * ipcp_protrej - A Protocol-Reject was received for IPCP. - * - * Pretend the lower layer went down, so we shut up. - */ -static void -ipcp_protrej(unit) - int unit; -{ - fsm_lowerdown(&ipcp_fsm[unit]); -} - - -/* - * ipcp_resetci - Reset our CI. - */ -static void -ipcp_resetci(f) - fsm *f; -{ - ipcp_options *wo = &ipcp_wantoptions[f->unit]; - - wo->req_addr = wo->neg_addr && ipcp_allowoptions[f->unit].neg_addr; - if (wo->ouraddr == 0) - wo->accept_local = 1; - if (wo->hisaddr == 0) - wo->accept_remote = 1; - ipcp_gotoptions[f->unit] = *wo; - cis_received[f->unit] = 0; -} - - -/* - * ipcp_cilen - Return length of our CI. - */ -static int -ipcp_cilen(f) - fsm *f; -{ - ipcp_options *go = &ipcp_gotoptions[f->unit]; - ipcp_options *wo = &ipcp_wantoptions[f->unit]; - ipcp_options *ho = &ipcp_hisoptions[f->unit]; - -#define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0) -#define LENCIADDR(neg, old) (neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 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 (cis_received[f->unit] == 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; - } - } - } - - 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 *go = &ipcp_gotoptions[f->unit]; - 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_int32_t 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; \ - } - - 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 = &ipcp_gotoptions[f->unit]; - u_short cilen, citype, cishort; - u_int32_t 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_int32_t 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 = &ipcp_gotoptions[f->unit]; - u_char cimaxslotindex, cicflag; - u_char citype, cilen, *next; - u_short cishort; - u_int32_t ciaddr1, ciaddr2, l; - ipcp_options no; /* options we've seen Naks for */ - ipcp_options try; /* options to request next time */ - - 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 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((go->old_addrs? CI_ADDRS: 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.old_addrs = 0; - GETLONG(l, p); - ciaddr1 = htonl(l); - if (ciaddr1 && go->accept_local) - try.ouraddr = ciaddr1; - if (try.ouraddr != 0) - try.neg_addr = 1; - no.neg_addr = 1; - break; - } - p = next; - } - - /* If there is still anything left, this packet is bad. */ - if (len != 0) - goto bad; - - /* - * OK, the Nak is good. Now we can update state. - */ - if (f->state != 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 = &ipcp_gotoptions[f->unit]; - u_char cimaxslotindex, ciflag, cilen; - u_short cishort; - u_int32_t cilong; - ipcp_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 REJCIADDR(opt, neg, old, val1, val2) \ - if (go->neg && \ - len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) && \ - p[1] == cilen && \ - p[0] == opt) { \ - u_int32_t l; \ - 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 = &ipcp_wantoptions[f->unit]; - ipcp_options *ho = &ipcp_hisoptions[f->unit]; - ipcp_options *ao = &ipcp_allowoptions[f->unit]; - ipcp_options *go = &ipcp_gotoptions[f->unit]; - u_char *cip, *next; /* Pointer to current and next CIs */ - u_short cilen, citype; /* Parsed len, type */ - u_short cishort; /* Parsed short value */ - u_int32_t 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; - int d; - - cis_received[f->unit] = 1; - - /* - * Reset all his options. - */ - BZERO(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(u_int32_t), p); - tl = ntohl(wo->hisaddr); - PUTLONG(tl, p); - } - } else if (ciaddr1 == 0 && wo->hisaddr == 0) { - /* - * If neither we nor he knows his address, reject the option. - */ - orc = CONFREJ; - wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */ - break; - } - - /* - * 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(u_int32_t), 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(u_int32_t), p); - tl = ntohl(wo->hisaddr); - PUTLONG(tl, p); - } - } else if (ciaddr1 == 0 && wo->hisaddr == 0) { - /* - * Don't ACK an address of 0.0.0.0 - reject it instead. - */ - orc = CONFREJ; - wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */ - break; - } - - ho->neg_addr = 1; - ho->hisaddr = ciaddr1; - break; - - case CI_MS_DNS1: - case CI_MS_DNS2: - /* Microsoft primary or secondary DNS request */ - d = citype == CI_MS_DNS2; - IPCPDEBUG((LOG_INFO, "ipcp: received DNS%d Request ", d+1)); - - /* If we do not have a DNS address then we cannot send it */ - if (ao->dnsaddr[d] == 0 || - cilen != CILEN_ADDR) { /* Check CI length */ - orc = CONFREJ; /* Reject CI */ - break; - } - GETLONG(tl, p); - if (htonl(tl) != ao->dnsaddr[d]) { - DECPTR(sizeof(u_int32_t), p); - tl = ntohl(ao->dnsaddr[d]); - PUTLONG(tl, p); - orc = CONFNAK; - } - break; - - case CI_MS_WINS1: - case CI_MS_WINS2: - /* Microsoft primary or secondary WINS request */ - d = citype == CI_MS_WINS2; - IPCPDEBUG((LOG_INFO, "ipcp: received WINS%d Request ", d+1)); - - /* If we do not have a DNS address then we cannot send it */ - if (ao->winsaddr[d] == 0 || - cilen != CILEN_ADDR) { /* Check CI length */ - orc = CONFREJ; /* Reject CI */ - break; - } - GETLONG(tl, p); - if (htonl(tl) != ao->winsaddr[d]) { - DECPTR(sizeof(u_int32_t), p); - tl = ntohl(ao->winsaddr[d]); - PUTLONG(tl, p); - orc = CONFNAK; - } - 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 = cflag; - } else { - ho->old_vj = 1; - ho->maxslotindex = MAX_STATES - 1; - ho->cflag = 1; - } - break; - - default: - orc = CONFREJ; - break; - } - -endswitch: - IPCPDEBUG((LOG_INFO, " (%s)\n", 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(cip, 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 */ -} - - -/* - * ip_check_options - check that any IP-related options are OK, - * and assign appropriate defaults. - */ -static void -ip_check_options() -{ - struct hostent *hp; - u_int32_t local; - ipcp_options *wo = &ipcp_wantoptions[0]; - - /* - * Default our local IP address based on our hostname. - * If local IP address already given, don't bother. - */ - if (wo->ouraddr == 0 && !disable_defaultip) { - /* - * Look up our hostname (possibly with domain name appended) - * and take the first IP address as our local IP address. - * If there isn't an IP address for our hostname, too bad. - */ - wo->accept_local = 1; /* don't insist on this default value */ - if ((hp = gethostbyname(hostname)) != NULL) { - local = *(u_int32_t *)hp->h_addr; - if (local != 0 && !bad_ip_adrs(local)) - wo->ouraddr = local; - } - } - - if (demand && wo->hisaddr == 0) { - option_error("remote IP address required for demand-dialling\n"); - exit(1); - } -#if 0 - if (demand && wo->accept_remote) { - option_error("ipcp-accept-remote is incompatible with demand\n"); - exit(1); - } -#endif -} - - -/* - * ip_demand_conf - configure the interface as though - * IPCP were up, for use with dial-on-demand. - */ -static int -ip_demand_conf(u) - int u; -{ - ipcp_options *wo = &ipcp_wantoptions[u]; - - if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr))) - return 0; - if (!sifup(u)) - return 0; - if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE)) - return 0; - if (wo->default_route) - if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr)) - default_route_set[u] = 1; - if (wo->proxy_arp) - if (sifproxyarp(u, wo->hisaddr)) - proxy_arp_set[u] = 1; - - syslog(LOG_NOTICE, "local IP address %s", ip_ntoa(wo->ouraddr)); - syslog(LOG_NOTICE, "remote IP address %s", ip_ntoa(wo->hisaddr)); - - return 1; -} - - -/* - * ipcp_up - IPCP has come UP. - * - * Configure the IP network interface appropriately and bring it up. - */ -static void -ipcp_up(f) - fsm *f; -{ - u_int32_t mask; - ipcp_options *ho = &ipcp_hisoptions[f->unit]; - ipcp_options *go = &ipcp_gotoptions[f->unit]; - ipcp_options *wo = &ipcp_wantoptions[f->unit]; - - np_up(f->unit, PPP_IP); - IPCPDEBUG((LOG_INFO, "ipcp: up")); - - /* - * We must have a non-zero IP address for both ends of the link. - */ - if (!ho->neg_addr) - ho->hisaddr = wo->hisaddr; - - if (ho->hisaddr == 0) { - syslog(LOG_ERR, "Could not determine remote IP address"); - ipcp_close(f->unit, "Could not determine remote IP address"); - return; - } - if (go->ouraddr == 0) { - syslog(LOG_ERR, "Could not determine local IP address"); - ipcp_close(f->unit, "Could not determine local IP address"); - return; - } - script_setenv("IPLOCAL", ip_ntoa(go->ouraddr)); - script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr)); - - /* - * 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, "Unauthorized remote IP address"); - return; - } - - /* set tcp compression */ - sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex); - - /* - * If we are doing dial-on-demand, the interface is already - * configured, so we put out any saved-up packets, then set the - * interface to pass IP packets. - */ - if (demand) { - if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) { - if (go->ouraddr != wo->ouraddr) - syslog(LOG_WARNING, "Local IP address changed to %s", - ip_ntoa(go->ouraddr)); - if (ho->hisaddr != wo->hisaddr) - syslog(LOG_WARNING, "Remote IP address changed to %s", - ip_ntoa(ho->hisaddr)); - ipcp_clear_addrs(f->unit); - - /* Set the interface to the new addresses */ - mask = GetMask(go->ouraddr); - if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) { - IPCPDEBUG((LOG_WARNING, "sifaddr failed")); - ipcp_close(f->unit, "Interface configuration failed"); - return; - } - - /* assign a default route through the interface if required */ - if (ipcp_wantoptions[f->unit].default_route) - if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) - default_route_set[f->unit] = 1; - - /* Make a proxy ARP entry if requested. */ - if (ipcp_wantoptions[f->unit].proxy_arp) - if (sifproxyarp(f->unit, ho->hisaddr)) - proxy_arp_set[f->unit] = 1; - - } - demand_rexmit(PPP_IP); - sifnpmode(f->unit, PPP_IP, NPMODE_PASS); - - } else { - /* - * Set IP addresses and (if specified) netmask. - */ - mask = GetMask(go->ouraddr); - -#if !(defined(SVR4) && (defined(SNI) || defined(__USLC__))) - if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) { - IPCPDEBUG((LOG_WARNING, "sifaddr failed")); - ipcp_close(f->unit, "Interface configuration failed"); - return; - } -#endif - - /* bring the interface up for IP */ - if (!sifup(f->unit)) { - IPCPDEBUG((LOG_WARNING, "sifup failed")); - ipcp_close(f->unit, "Interface configuration failed"); - return; - } - -#if (defined(SVR4) && (defined(SNI) || defined(__USLC__))) - if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) { - IPCPDEBUG((LOG_WARNING, "sifaddr failed")); - ipcp_close(f->unit, "Interface configuration failed"); - return; - } -#endif - sifnpmode(f->unit, PPP_IP, NPMODE_PASS); - - /* assign a default route through the interface if required */ - if (ipcp_wantoptions[f->unit].default_route) - if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) - default_route_set[f->unit] = 1; - - /* Make a proxy ARP entry if requested. */ - if (ipcp_wantoptions[f->unit].proxy_arp) - if (sifproxyarp(f->unit, ho->hisaddr)) - proxy_arp_set[f->unit] = 1; - - syslog(LOG_NOTICE, "local IP address %s", ip_ntoa(go->ouraddr)); - syslog(LOG_NOTICE, "remote IP address %s", ip_ntoa(ho->hisaddr)); - } - - /* - * Execute the ip-up script, like this: - * /etc/ppp/ip-up interface tty speed local-IP remote-IP - */ - ipcp_script(f, _PATH_IPUP); - -} - - -/* - * 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; -{ - IPCPDEBUG((LOG_INFO, "ipcp: down")); - np_down(f->unit, PPP_IP); - sifvjcomp(f->unit, 0, 0, 0); - - /* - * If we are doing dial-on-demand, set the interface - * to queue up outgoing packets (for now). - */ - if (demand) { - sifnpmode(f->unit, PPP_IP, NPMODE_QUEUE); - } else { - sifdown(f->unit); - ipcp_clear_addrs(f->unit); - } - - /* Execute the ip-down script */ - ipcp_script(f, _PATH_IPDOWN); -} - - -/* - * ipcp_clear_addrs() - clear the interface addresses, routes, - * proxy arp entries, etc. - */ -static void -ipcp_clear_addrs(unit) - int unit; -{ - u_int32_t ouraddr, hisaddr; - - ouraddr = ipcp_gotoptions[unit].ouraddr; - hisaddr = ipcp_hisoptions[unit].hisaddr; - if (proxy_arp_set[unit]) { - cifproxyarp(unit, hisaddr); - proxy_arp_set[unit] = 0; - } - if (default_route_set[unit]) { - cifdefaultroute(unit, ouraddr, hisaddr); - default_route_set[unit] = 0; - } - cifaddr(unit, ouraddr, hisaddr); -} - - -/* - * ipcp_finished - possibly shut down the lower layers. - */ -static void -ipcp_finished(f) - fsm *f; -{ - np_finished(f->unit, PPP_IP); -} - - -/* - * 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", baud_rate); - strcpy(strlocal, ip_ntoa(ipcp_gotoptions[f->unit].ouraddr)); - strcpy(strremote, ip_ntoa(ipcp_hisoptions[f->unit].hisaddr)); - - argv[0] = script; - argv[1] = ifname; - argv[2] = devnam; - argv[3] = strspeed; - argv[4] = strlocal; - argv[5] = strremote; - argv[6] = ipparam; - argv[7] = NULL; - run_program(script, argv, 0); -} - -/* - * ipcp_printpkt - print the contents of an IPCP packet. - */ -static char *ipcp_codenames[] = { - "ConfReq", "ConfAck", "ConfNak", "ConfRej", - "TermReq", "TermAck", "CodeRej" -}; - -static int -ipcp_printpkt(p, plen, printer, arg) - u_char *p; - int plen; - void (*printer)(void *, char *, ...); - void *arg; -{ - int code, id, len, olen; - u_char *pstart, *optend; - u_short cishort; - u_int32_t cilong; - - if (plen < HEADERLEN) - return 0; - pstart = p; - GETCHAR(code, p); - GETCHAR(id, p); - GETSHORT(len, p); - if (len < HEADERLEN || len > plen) - return 0; - - if (code >= 1 && code <= sizeof(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 %I", htonl(cilong)); - GETLONG(cilong, p); - printer(arg, " %I", 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 %I", htonl(cilong)); - } - break; - case CI_MS_DNS1: - case CI_MS_DNS2: - p += 2; - GETLONG(cilong, p); - printer(arg, "ms-dns %I", htonl(cilong)); - break; - case CI_MS_WINS1: - case CI_MS_WINS2: - p += 2; - GETLONG(cilong, p); - printer(arg, "ms-wins %I", htonl(cilong)); - break; - } - while (p < optend) { - GETCHAR(code, p); - printer(arg, " %.2x", code); - } - printer(arg, ">"); - } - break; - - case TERMACK: - case TERMREQ: - if (len > 0 && *p >= ' ' && *p < 0x7f) { - printer(arg, " "); - print_string(p, len, printer, arg); - p += len; - len = 0; - } - break; - } - - /* print the rest of the bytes in the packet */ - for (; len > 0; --len) { - GETCHAR(code, p); - printer(arg, " %.2x", code); - } - - return p - pstart; -} - -/* - * ip_active_pkt - see if this IP packet is worth bringing the link up for. - * We don't bring the link up for IP fragments or for TCP FIN packets - * with no data. - */ -#define IP_HDRLEN 20 /* bytes */ -#define IP_OFFMASK 0x1fff -#define IPPROTO_TCP 6 -#define TCP_HDRLEN 20 -#define TH_FIN 0x01 - -/* - * We use these macros because the IP header may be at an odd address, - * and some compilers might use word loads to get th_off or ip_hl. - */ - -#define net_short(x) (((x)[0] << 8) + (x)[1]) -#define get_iphl(x) (((unsigned char *)(x))[0] & 0xF) -#define get_ipoff(x) net_short((unsigned char *)(x) + 6) -#define get_ipproto(x) (((unsigned char *)(x))[9]) -#define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4) -#define get_tcpflags(x) (((unsigned char *)(x))[13]) - -static int -ip_active_pkt(pkt, len) - u_char *pkt; - int len; -{ - u_char *tcp; - int hlen; - - len -= PPP_HDRLEN; - pkt += PPP_HDRLEN; - if (len < IP_HDRLEN) - return 0; - if ((get_ipoff(pkt) & IP_OFFMASK) != 0) - return 0; - if (get_ipproto(pkt) != IPPROTO_TCP) - return 1; - hlen = get_iphl(pkt) * 4; - if (len < hlen + TCP_HDRLEN) - return 0; - tcp = pkt + hlen; - if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4) - return 0; - return 1; -} |