2 * ipcp.c - PPP IP Control Protocol.
4 * Copyright (c) 1989 Carnegie Mellon University.
7 * Redistribution and use in source and binary forms are permitted
8 * provided that the above copyright notice and this paragraph are
9 * duplicated in all such forms and that any documentation,
10 * advertising materials, and other materials related to such
11 * distribution and use acknowledge that the software was developed
12 * by Carnegie Mellon University. The name of the
13 * University may not be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21 static char rcsid[] = "$Id: ipcp.c,v 1.29 1996/09/26 06:21:33 paulus Exp $";
32 #include <sys/param.h>
33 #include <sys/types.h>
34 #include <sys/socket.h>
35 #include <netinet/in.h>
40 #include "pathnames.h"
43 ipcp_options ipcp_wantoptions[NUM_PPP]; /* Options that we want to request */
44 ipcp_options ipcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
45 ipcp_options ipcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
46 ipcp_options ipcp_hisoptions[NUM_PPP]; /* Options that we ack'd */
49 static int cis_received[NUM_PPP]; /* # Conf-Reqs received */
50 static int default_route_set[NUM_PPP]; /* Have set up a default route */
51 static int proxy_arp_set[NUM_PPP]; /* Have created proxy arp entry */
54 * Callbacks for fsm code. (CI = Configuration Information)
56 static void ipcp_resetci __P((fsm *)); /* Reset our CI */
57 static int ipcp_cilen __P((fsm *)); /* Return length of our CI */
58 static void ipcp_addci __P((fsm *, u_char *, int *)); /* Add our CI */
59 static int ipcp_ackci __P((fsm *, u_char *, int)); /* Peer ack'd our CI */
60 static int ipcp_nakci __P((fsm *, u_char *, int)); /* Peer nak'd our CI */
61 static int ipcp_rejci __P((fsm *, u_char *, int)); /* Peer rej'd our CI */
62 static int ipcp_reqci __P((fsm *, u_char *, int *, int)); /* Rcv CI */
63 static void ipcp_up __P((fsm *)); /* We're UP */
64 static void ipcp_down __P((fsm *)); /* We're DOWN */
65 static void ipcp_script __P((fsm *, char *)); /* Run an up/down script */
66 static void ipcp_finished __P((fsm *)); /* Don't need lower layer */
68 fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */
70 static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
71 ipcp_resetci, /* Reset our Configuration Information */
72 ipcp_cilen, /* Length of our Configuration Information */
73 ipcp_addci, /* Add our Configuration Information */
74 ipcp_ackci, /* ACK our Configuration Information */
75 ipcp_nakci, /* NAK our Configuration Information */
76 ipcp_rejci, /* Reject our Configuration Information */
77 ipcp_reqci, /* Request peer's Configuration Information */
78 ipcp_up, /* Called when fsm reaches OPENED state */
79 ipcp_down, /* Called when fsm leaves OPENED state */
80 NULL, /* Called when we want the lower layer up */
81 ipcp_finished, /* Called when we want the lower layer down */
82 NULL, /* Called when Protocol-Reject received */
83 NULL, /* Retransmission is necessary */
84 NULL, /* Called to handle protocol-specific codes */
85 "IPCP" /* String name of protocol */
89 * Protocol entry points from main code.
91 static void ipcp_init __P((int));
92 static void ipcp_open __P((int));
93 static void ipcp_close __P((int, char *));
94 static void ipcp_lowerup __P((int));
95 static void ipcp_lowerdown __P((int));
96 static void ipcp_input __P((int, u_char *, int));
97 static void ipcp_protrej __P((int));
98 static int ipcp_printpkt __P((u_char *, int,
99 void (*) __P((void *, char *, ...)), void *));
100 static void ip_check_options __P((void));
101 static int ip_demand_conf __P((int));
102 static int ip_active_pkt __P((u_char *, int));
104 struct protent ipcp_protent = {
123 * Lengths of configuration options.
126 #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */
127 #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */
128 #define CILEN_ADDR 6 /* new-style single address option */
129 #define CILEN_ADDRS 10 /* old-style dual address option */
132 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
133 (x) == CONFNAK ? "NAK" : "REJ")
137 * Make a string representation of a network IP address.
145 ipaddr = ntohl(ipaddr);
147 sprintf(b, "%d.%d.%d.%d",
148 (u_char)(ipaddr >> 24),
149 (u_char)(ipaddr >> 16),
150 (u_char)(ipaddr >> 8),
157 * ipcp_init - Initialize IPCP.
163 fsm *f = &ipcp_fsm[unit];
164 ipcp_options *wo = &ipcp_wantoptions[unit];
165 ipcp_options *ao = &ipcp_allowoptions[unit];
168 f->protocol = PPP_IPCP;
169 f->callbacks = &ipcp_callbacks;
170 fsm_init(&ipcp_fsm[unit]);
172 memset(wo, 0, sizeof(*wo));
173 memset(ao, 0, sizeof(*ao));
177 wo->vj_protocol = IPCP_VJ_COMP;
178 wo->maxslotindex = MAX_STATES - 1; /* really max index */
181 /* max slots and slot-id compression are currently hardwired in */
182 /* ppp_if.c to 16 and 1, this needs to be changed (among other */
187 ao->maxslotindex = MAX_STATES - 1;
191 * XXX These control whether the user may use the proxyarp
192 * and defaultroute options.
195 ao->default_route = 1;
200 * ipcp_open - IPCP is allowed to come up.
206 fsm_open(&ipcp_fsm[unit]);
211 * ipcp_close - Take IPCP down.
214 ipcp_close(unit, reason)
218 fsm_close(&ipcp_fsm[unit], reason);
223 * ipcp_lowerup - The lower layer is up.
229 fsm_lowerup(&ipcp_fsm[unit]);
234 * ipcp_lowerdown - The lower layer is down.
240 fsm_lowerdown(&ipcp_fsm[unit]);
245 * ipcp_input - Input IPCP packet.
248 ipcp_input(unit, p, len)
253 fsm_input(&ipcp_fsm[unit], p, len);
258 * ipcp_protrej - A Protocol-Reject was received for IPCP.
260 * Pretend the lower layer went down, so we shut up.
266 fsm_lowerdown(&ipcp_fsm[unit]);
271 * ipcp_resetci - Reset our CI.
277 ipcp_options *wo = &ipcp_wantoptions[f->unit];
279 wo->req_addr = wo->neg_addr && ipcp_allowoptions[f->unit].neg_addr;
280 if (wo->ouraddr == 0)
281 wo->accept_local = 1;
282 if (wo->hisaddr == 0)
283 wo->accept_remote = 1;
284 ipcp_gotoptions[f->unit] = *wo;
285 cis_received[f->unit] = 0;
290 * ipcp_cilen - Return length of our CI.
296 ipcp_options *go = &ipcp_gotoptions[f->unit];
297 ipcp_options *wo = &ipcp_wantoptions[f->unit];
298 ipcp_options *ho = &ipcp_hisoptions[f->unit];
300 #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
301 #define LENCIADDR(neg, old) (neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 0)
304 * First see if we want to change our options to the old
305 * forms because we have received old forms from the peer.
307 if (wo->neg_addr && !go->neg_addr && !go->old_addrs) {
308 /* use the old style of address negotiation */
312 if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
313 /* try an older style of VJ negotiation */
314 if (cis_received[f->unit] == 0) {
315 /* keep trying the new style until we see some CI from the peer */
318 /* use the old style only if the peer did */
319 if (ho->neg_vj && ho->old_vj) {
322 go->vj_protocol = ho->vj_protocol;
327 return (LENCIADDR(go->neg_addr, go->old_addrs) +
328 LENCIVJ(go->neg_vj, go->old_vj));
333 * ipcp_addci - Add our desired CIs to a packet.
336 ipcp_addci(f, ucp, lenp)
341 ipcp_options *go = &ipcp_gotoptions[f->unit];
344 #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
346 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
347 if (len >= vjlen) { \
349 PUTCHAR(vjlen, ucp); \
350 PUTSHORT(val, ucp); \
352 PUTCHAR(maxslotindex, ucp); \
353 PUTCHAR(cflag, ucp); \
360 #define ADDCIADDR(opt, neg, old, val1, val2) \
362 int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
363 if (len >= addrlen) { \
366 PUTCHAR(addrlen, ucp); \
378 ADDCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
379 go->old_addrs, go->ouraddr, go->hisaddr);
381 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
382 go->maxslotindex, go->cflag);
389 * ipcp_ackci - Ack our CIs.
396 ipcp_ackci(f, p, len)
401 ipcp_options *go = &ipcp_gotoptions[f->unit];
402 u_short cilen, citype, cishort;
404 u_char cimaxslotindex, cicflag;
407 * CIs must be in exactly the same order that we sent...
408 * Check packet length and CI length at each step.
409 * If we find any deviations, then this packet is bad.
412 #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
414 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
415 if ((len -= vjlen) < 0) \
417 GETCHAR(citype, p); \
419 if (cilen != vjlen || \
422 GETSHORT(cishort, p); \
423 if (cishort != val) \
426 GETCHAR(cimaxslotindex, p); \
427 if (cimaxslotindex != maxslotindex) \
429 GETCHAR(cicflag, p); \
430 if (cicflag != cflag) \
435 #define ACKCIADDR(opt, neg, old, val1, val2) \
437 int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
439 if ((len -= addrlen) < 0) \
441 GETCHAR(citype, p); \
443 if (cilen != addrlen || \
448 if (val1 != cilong) \
453 if (val2 != cilong) \
458 ACKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
459 go->old_addrs, go->ouraddr, go->hisaddr);
461 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
462 go->maxslotindex, go->cflag);
465 * If there are any remaining CIs, then this packet is bad.
472 IPCPDEBUG((LOG_INFO, "ipcp_ackci: received bad Ack!"));
477 * ipcp_nakci - Peer has sent a NAK for some of our CIs.
478 * This should not modify any state if the Nak is bad
479 * or if IPCP is in the OPENED state.
486 ipcp_nakci(f, p, len)
491 ipcp_options *go = &ipcp_gotoptions[f->unit];
492 u_char cimaxslotindex, cicflag;
493 u_char citype, cilen, *next;
495 u_int32_t ciaddr1, ciaddr2, l;
496 ipcp_options no; /* options we've seen Naks for */
497 ipcp_options try; /* options to request next time */
499 BZERO(&no, sizeof(no));
503 * Any Nak'd CIs must be in exactly the same order that we sent.
504 * Check packet length and CI length at each step.
505 * If we find any deviations, then this packet is bad.
507 #define NAKCIADDR(opt, neg, old, code) \
509 len >= (cilen = (old? CILEN_ADDRS: CILEN_ADDR)) && \
515 ciaddr1 = htonl(l); \
518 ciaddr2 = htonl(l); \
526 #define NAKCIVJ(opt, neg, code) \
528 ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
533 GETSHORT(cishort, p); \
539 * Accept the peer's idea of {our,his} address, if different
540 * from our idea, only if the accept_{local,remote} flag is set.
542 NAKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, go->old_addrs,
543 if (go->accept_local && ciaddr1) { /* Do we know our address? */
544 try.ouraddr = ciaddr1;
545 IPCPDEBUG((LOG_INFO, "local IP address %s",
548 if (go->accept_remote && ciaddr2) { /* Does he know his? */
549 try.hisaddr = ciaddr2;
550 IPCPDEBUG((LOG_INFO, "remote IP address %s",
556 * Accept the peer's value of maxslotindex provided that it
557 * is less than what we asked for. Turn off slot-ID compression
558 * if the peer wants. Send old-style compress-type option if
561 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
562 if (cilen == CILEN_VJ) {
563 GETCHAR(cimaxslotindex, p);
565 if (cishort == IPCP_VJ_COMP) {
567 if (cimaxslotindex < go->maxslotindex)
568 try.maxslotindex = cimaxslotindex;
575 if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
577 try.vj_protocol = cishort;
585 * There may be remaining CIs, if the peer is requesting negotiation
586 * on an option that we didn't include in our request packet.
587 * If they want to negotiate about IP addresses, we comply.
588 * If they want us to ask for compression, we refuse.
590 while (len > CILEN_VOID) {
593 if( (len -= cilen) < 0 )
595 next = p + cilen - 2;
598 case CI_COMPRESSTYPE:
599 if (go->neg_vj || no.neg_vj ||
600 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS))
605 if (go->neg_addr && go->old_addrs || no.old_addrs
606 || cilen != CILEN_ADDRS)
612 if (ciaddr1 && go->accept_local)
613 try.ouraddr = ciaddr1;
616 if (ciaddr2 && go->accept_remote)
617 try.hisaddr = ciaddr2;
621 if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR)
626 if (ciaddr1 && go->accept_local)
627 try.ouraddr = ciaddr1;
628 if (try.ouraddr != 0)
636 /* If there is still anything left, this packet is bad. */
641 * OK, the Nak is good. Now we can update state.
643 if (f->state != OPENED)
649 IPCPDEBUG((LOG_INFO, "ipcp_nakci: received bad Nak!"));
655 * ipcp_rejci - Reject some of our CIs.
658 ipcp_rejci(f, p, len)
663 ipcp_options *go = &ipcp_gotoptions[f->unit];
664 u_char cimaxslotindex, ciflag, cilen;
667 ipcp_options try; /* options to request next time */
671 * Any Rejected CIs must be in exactly the same order that we sent.
672 * Check packet length and CI length at each step.
673 * If we find any deviations, then this packet is bad.
675 #define REJCIADDR(opt, neg, old, val1, val2) \
677 len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) && \
685 /* Check rejected value. */ \
686 if (cilong != val1) \
691 /* Check rejected value. */ \
692 if (cilong != val2) \
698 #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
700 p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
705 GETSHORT(cishort, p); \
706 /* Check rejected value. */ \
707 if (cishort != val) \
710 GETCHAR(cimaxslotindex, p); \
711 if (cimaxslotindex != maxslot) \
713 GETCHAR(ciflag, p); \
714 if (ciflag != cflag) \
720 REJCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr,
721 go->old_addrs, go->ouraddr, go->hisaddr);
723 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
724 go->maxslotindex, go->cflag);
727 * If there are any remaining CIs, then this packet is bad.
732 * Now we can update state.
734 if (f->state != OPENED)
739 IPCPDEBUG((LOG_INFO, "ipcp_rejci: received bad Reject!"));
745 * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
747 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
748 * appropriately. If reject_if_disagree is non-zero, doesn't return
749 * CONFNAK; returns CONFREJ if it can't return CONFACK.
752 ipcp_reqci(f, inp, len, reject_if_disagree)
754 u_char *inp; /* Requested CIs */
755 int *len; /* Length of requested CIs */
756 int reject_if_disagree;
758 ipcp_options *wo = &ipcp_wantoptions[f->unit];
759 ipcp_options *ho = &ipcp_hisoptions[f->unit];
760 ipcp_options *ao = &ipcp_allowoptions[f->unit];
761 ipcp_options *go = &ipcp_gotoptions[f->unit];
762 u_char *cip, *next; /* Pointer to current and next CIs */
763 u_short cilen, citype; /* Parsed len, type */
764 u_short cishort; /* Parsed short value */
765 u_int32_t tl, ciaddr1, ciaddr2;/* Parsed address values */
766 int rc = CONFACK; /* Final packet return code */
767 int orc; /* Individual option return code */
768 u_char *p; /* Pointer to next char to parse */
769 u_char *ucp = inp; /* Pointer to current output char */
770 int l = *len; /* Length left */
771 u_char maxslotindex, cflag;
774 cis_received[f->unit] = 1;
777 * Reset all his options.
779 BZERO(ho, sizeof(*ho));
782 * Process all his options.
786 orc = CONFACK; /* Assume success */
787 cip = p = next; /* Remember begining of CI */
788 if (l < 2 || /* Not enough data for CI header or */
789 p[1] < 2 || /* CI length too small or */
790 p[1] > l) { /* CI length too big? */
791 IPCPDEBUG((LOG_INFO, "ipcp_reqci: bad CI length!"));
792 orc = CONFREJ; /* Reject bad CI */
793 cilen = l; /* Reject till end of packet */
794 l = 0; /* Don't loop again */
797 GETCHAR(citype, p); /* Parse CI type */
798 GETCHAR(cilen, p); /* Parse CI length */
799 l -= cilen; /* Adjust remaining length */
800 next += cilen; /* Step to next CI */
802 switch (citype) { /* Check CI type */
804 IPCPDEBUG((LOG_INFO, "ipcp: received ADDRS "));
806 cilen != CILEN_ADDRS) { /* Check CI length */
807 orc = CONFREJ; /* Reject CI */
812 * If he has no address, or if we both have his address but
813 * disagree about it, then NAK it with our idea.
814 * In particular, if we don't know his address, but he does,
817 GETLONG(tl, p); /* Parse source address (his) */
819 IPCPDEBUG((LOG_INFO, "(%s:", ip_ntoa(ciaddr1)));
820 if (ciaddr1 != wo->hisaddr
821 && (ciaddr1 == 0 || !wo->accept_remote)) {
823 if (!reject_if_disagree) {
824 DECPTR(sizeof(u_int32_t), p);
825 tl = ntohl(wo->hisaddr);
828 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
830 * If neither we nor he knows his address, reject the option.
833 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
838 * If he doesn't know our address, or if we both have our address
839 * but disagree about it, then NAK it with our idea.
841 GETLONG(tl, p); /* Parse desination address (ours) */
843 IPCPDEBUG((LOG_INFO, "%s)", ip_ntoa(ciaddr2)));
844 if (ciaddr2 != wo->ouraddr) {
845 if (ciaddr2 == 0 || !wo->accept_local) {
847 if (!reject_if_disagree) {
848 DECPTR(sizeof(u_int32_t), p);
849 tl = ntohl(wo->ouraddr);
853 go->ouraddr = ciaddr2; /* accept peer's idea */
859 ho->hisaddr = ciaddr1;
860 ho->ouraddr = ciaddr2;
864 IPCPDEBUG((LOG_INFO, "ipcp: received ADDR "));
867 cilen != CILEN_ADDR) { /* Check CI length */
868 orc = CONFREJ; /* Reject CI */
873 * If he has no address, or if we both have his address but
874 * disagree about it, then NAK it with our idea.
875 * In particular, if we don't know his address, but he does,
878 GETLONG(tl, p); /* Parse source address (his) */
880 IPCPDEBUG((LOG_INFO, "(%s)", ip_ntoa(ciaddr1)));
881 if (ciaddr1 != wo->hisaddr
882 && (ciaddr1 == 0 || !wo->accept_remote)) {
884 if (!reject_if_disagree) {
885 DECPTR(sizeof(u_int32_t), p);
886 tl = ntohl(wo->hisaddr);
889 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
891 * Don't ACK an address of 0.0.0.0 - reject it instead.
894 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
899 ho->hisaddr = ciaddr1;
904 /* Microsoft primary or secondary DNS request */
905 d = citype == CI_MS_DNS2;
906 IPCPDEBUG((LOG_INFO, "ipcp: received DNS%d Request ", d+1));
908 /* If we do not have a DNS address then we cannot send it */
909 if (ao->dnsaddr[d] == 0 ||
910 cilen != CILEN_ADDR) { /* Check CI length */
911 orc = CONFREJ; /* Reject CI */
915 if (htonl(tl) != ao->dnsaddr[d]) {
916 DECPTR(sizeof(u_int32_t), p);
917 tl = ntohl(ao->dnsaddr[d]);
923 case CI_COMPRESSTYPE:
924 IPCPDEBUG((LOG_INFO, "ipcp: received COMPRESSTYPE "));
926 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
930 GETSHORT(cishort, p);
931 IPCPDEBUG((LOG_INFO, "(%d)", cishort));
933 if (!(cishort == IPCP_VJ_COMP ||
934 (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
940 ho->vj_protocol = cishort;
941 if (cilen == CILEN_VJ) {
942 GETCHAR(maxslotindex, p);
943 if (maxslotindex > ao->maxslotindex) {
945 if (!reject_if_disagree){
947 PUTCHAR(ao->maxslotindex, p);
951 if (cflag && !ao->cflag) {
953 if (!reject_if_disagree){
955 PUTCHAR(wo->cflag, p);
958 ho->maxslotindex = maxslotindex;
962 ho->maxslotindex = MAX_STATES - 1;
973 IPCPDEBUG((LOG_INFO, " (%s)\n", CODENAME(orc)));
975 if (orc == CONFACK && /* Good CI */
976 rc != CONFACK) /* but prior CI wasnt? */
977 continue; /* Don't send this one */
979 if (orc == CONFNAK) { /* Nak this CI? */
980 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
981 orc = CONFREJ; /* Get tough if so */
983 if (rc == CONFREJ) /* Rejecting prior CI? */
984 continue; /* Don't send this one */
985 if (rc == CONFACK) { /* Ack'd all prior CIs? */
986 rc = CONFNAK; /* Not anymore... */
987 ucp = inp; /* Backup */
992 if (orc == CONFREJ && /* Reject this CI */
993 rc != CONFREJ) { /* but no prior ones? */
995 ucp = inp; /* Backup */
998 /* Need to move CI? */
1000 BCOPY(cip, ucp, cilen); /* Move it */
1002 /* Update output pointer */
1007 * If we aren't rejecting this packet, and we want to negotiate
1008 * their address, and they didn't send their address, then we
1009 * send a NAK with a CI_ADDR option appended. We assume the
1010 * input buffer is long enough that we can append the extra
1013 if (rc != CONFREJ && !ho->neg_addr &&
1014 wo->req_addr && !reject_if_disagree) {
1015 if (rc == CONFACK) {
1017 ucp = inp; /* reset pointer */
1018 wo->req_addr = 0; /* don't ask again */
1020 PUTCHAR(CI_ADDR, ucp);
1021 PUTCHAR(CILEN_ADDR, ucp);
1022 tl = ntohl(wo->hisaddr);
1026 *len = ucp - inp; /* Compute output length */
1027 IPCPDEBUG((LOG_INFO, "ipcp: returning Configure-%s", CODENAME(rc)));
1028 return (rc); /* Return final code */
1033 * ip_check_options - check that any IP-related options are OK,
1034 * and assign appropriate defaults.
1041 ipcp_options *wo = &ipcp_wantoptions[0];
1044 * Default our local IP address based on our hostname.
1045 * If local IP address already given, don't bother.
1047 if (wo->ouraddr == 0 && !disable_defaultip) {
1049 * Look up our hostname (possibly with domain name appended)
1050 * and take the first IP address as our local IP address.
1051 * If there isn't an IP address for our hostname, too bad.
1053 wo->accept_local = 1; /* don't insist on this default value */
1054 if ((hp = gethostbyname(hostname)) != NULL) {
1055 local = *(u_int32_t *)hp->h_addr;
1056 if (local != 0 && !bad_ip_adrs(local))
1057 wo->ouraddr = local;
1061 if (demand && wo->hisaddr == 0) {
1062 option_error("remote IP address required for demand-dialling\n");
1065 if (demand && wo->accept_remote) {
1066 option_error("ipcp-accept-remote is incompatible with demand\n");
1073 * ip_demand_conf - configure the interface as though
1074 * IPCP were up, for use with dial-on-demand.
1080 ipcp_options *wo = &ipcp_wantoptions[u];
1082 if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr)))
1086 if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE))
1088 if (wo->default_route)
1089 if (sifdefaultroute(u, wo->hisaddr))
1090 default_route_set[u] = 1;
1092 if (sifproxyarp(u, wo->hisaddr))
1093 proxy_arp_set[u] = 1;
1095 syslog(LOG_NOTICE, "local IP address %s", ip_ntoa(wo->ouraddr));
1096 syslog(LOG_NOTICE, "remote IP address %s", ip_ntoa(wo->hisaddr));
1103 * ipcp_up - IPCP has come UP.
1105 * Configure the IP network interface appropriately and bring it up.
1112 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1113 ipcp_options *go = &ipcp_gotoptions[f->unit];
1114 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1116 np_up(f->unit, PPP_IP);
1117 IPCPDEBUG((LOG_INFO, "ipcp: up"));
1120 * We must have a non-zero IP address for both ends of the link.
1123 ho->hisaddr = wo->hisaddr;
1125 if (ho->hisaddr == 0) {
1126 syslog(LOG_ERR, "Could not determine remote IP address");
1127 ipcp_close(f->unit, "Could not determine remote IP address");
1130 if (go->ouraddr == 0) {
1131 syslog(LOG_ERR, "Could not determine local IP address");
1132 ipcp_close(f->unit, "Could not determine local IP address");
1137 * Check that the peer is allowed to use the IP address it wants.
1139 if (!auth_ip_addr(f->unit, ho->hisaddr)) {
1140 syslog(LOG_ERR, "Peer is not authorized to use remote address %s",
1141 ip_ntoa(ho->hisaddr));
1142 ipcp_close(f->unit, "Unauthorized remote IP address");
1146 /* set tcp compression */
1147 sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
1150 * If we are doing dial-on-demand, the interface is already
1151 * configured, so we put out any saved-up packets, then set the
1152 * interface to pass IP packets.
1155 if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) {
1156 syslog(LOG_ERR, "Failed to negotiate desired IP addresses");
1157 ipcp_close(f->unit, "Wrong IP addresses");
1160 demand_rexmit(PPP_IP);
1161 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1165 * Set IP addresses and (if specified) netmask.
1167 mask = GetMask(go->ouraddr);
1169 #if !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1170 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1171 IPCPDEBUG((LOG_WARNING, "sifaddr failed"));
1172 ipcp_close(f->unit, "Interface configuration failed");
1177 /* bring the interface up for IP */
1178 if (!sifup(f->unit)) {
1179 IPCPDEBUG((LOG_WARNING, "sifup failed"));
1180 ipcp_close(f->unit, "Interface configuration failed");
1184 #if (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1185 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1186 IPCPDEBUG((LOG_WARNING, "sifaddr failed"));
1187 ipcp_close(f->unit, "Interface configuration failed");
1191 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1193 /* assign a default route through the interface if required */
1194 if (ipcp_wantoptions[f->unit].default_route)
1195 if (sifdefaultroute(f->unit, ho->hisaddr))
1196 default_route_set[f->unit] = 1;
1198 /* Make a proxy ARP entry if requested. */
1199 if (ipcp_wantoptions[f->unit].proxy_arp)
1200 if (sifproxyarp(f->unit, ho->hisaddr))
1201 proxy_arp_set[f->unit] = 1;
1203 syslog(LOG_NOTICE, "local IP address %s", ip_ntoa(go->ouraddr));
1204 syslog(LOG_NOTICE, "remote IP address %s", ip_ntoa(ho->hisaddr));
1208 * Execute the ip-up script, like this:
1209 * /etc/ppp/ip-up interface tty speed local-IP remote-IP
1211 ipcp_script(f, _PATH_IPUP);
1217 * ipcp_down - IPCP has gone DOWN.
1219 * Take the IP network interface down, clear its addresses
1220 * and delete routes through it.
1226 u_int32_t ouraddr, hisaddr;
1228 IPCPDEBUG((LOG_INFO, "ipcp: down"));
1229 np_down(f->unit, PPP_IP);
1230 sifvjcomp(f->unit, 0, 0, 0);
1233 * If we are doing dial-on-demand, set the interface
1234 * to queue up outgoing packets (for now).
1237 sifnpmode(f->unit, PPP_IP, NPMODE_QUEUE);
1240 ouraddr = ipcp_gotoptions[f->unit].ouraddr;
1241 hisaddr = ipcp_hisoptions[f->unit].hisaddr;
1242 if (proxy_arp_set[f->unit]) {
1243 cifproxyarp(f->unit, hisaddr);
1244 proxy_arp_set[f->unit] = 0;
1246 if (default_route_set[f->unit]) {
1247 cifdefaultroute(f->unit, hisaddr);
1248 default_route_set[f->unit] = 0;
1251 cifaddr(f->unit, ouraddr, hisaddr);
1254 /* Execute the ip-down script */
1255 ipcp_script(f, _PATH_IPDOWN);
1260 * ipcp_finished - possibly shut down the lower layers.
1266 np_finished(f->unit, PPP_IP);
1271 * ipcp_script - Execute a script with arguments
1272 * interface-name tty-name speed local-IP remote-IP.
1275 ipcp_script(f, script)
1279 char strspeed[32], strlocal[32], strremote[32];
1282 sprintf(strspeed, "%d", baud_rate);
1283 strcpy(strlocal, ip_ntoa(ipcp_gotoptions[f->unit].ouraddr));
1284 strcpy(strremote, ip_ntoa(ipcp_hisoptions[f->unit].hisaddr));
1291 argv[5] = strremote;
1294 run_program(script, argv, 0);
1298 * ipcp_printpkt - print the contents of an IPCP packet.
1300 static char *ipcp_codenames[] = {
1301 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1302 "TermReq", "TermAck", "CodeRej"
1306 ipcp_printpkt(p, plen, printer, arg)
1309 void (*printer) __P((void *, char *, ...));
1312 int code, id, len, olen;
1313 u_char *pstart, *optend;
1317 if (plen < HEADERLEN)
1323 if (len < HEADERLEN || len > plen)
1326 if (code >= 1 && code <= sizeof(ipcp_codenames) / sizeof(char *))
1327 printer(arg, " %s", ipcp_codenames[code-1]);
1329 printer(arg, " code=0x%x", code);
1330 printer(arg, " id=0x%x", id);
1337 /* print option list */
1342 if (olen < 2 || olen > len) {
1350 if (olen == CILEN_ADDRS) {
1353 printer(arg, "addrs %s", ip_ntoa(htonl(cilong)));
1355 printer(arg, " %s", ip_ntoa(htonl(cilong)));
1358 case CI_COMPRESSTYPE:
1359 if (olen >= CILEN_COMPRESS) {
1361 GETSHORT(cishort, p);
1362 printer(arg, "compress ");
1367 case IPCP_VJ_COMP_OLD:
1368 printer(arg, "old-VJ");
1371 printer(arg, "0x%x", cishort);
1376 if (olen == CILEN_ADDR) {
1379 printer(arg, "addr %s", ip_ntoa(htonl(cilong)));
1383 while (p < optend) {
1385 printer(arg, " %.2x", code);
1393 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1395 print_string(p, len, printer, arg);
1402 /* print the rest of the bytes in the packet */
1403 for (; len > 0; --len) {
1405 printer(arg, " %.2x", code);
1412 * ip_active_pkt - see if this IP packet is worth bringing the link up for.
1413 * We don't bring the link up for IP fragments or for TCP FIN packets
1416 #define IP_HDRLEN 20 /* bytes */
1417 #define IP_OFFMASK 0x1fff
1418 #define IPPROTO_TCP 6
1419 #define TCP_HDRLEN 20
1423 * We use these macros because the IP header may be at an odd address,
1424 * and some compilers might use word loads to get th_off or ip_hl.
1427 #define net_short(x) (((x)[0] << 8) + (x)[1])
1428 #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF)
1429 #define get_ipoff(x) net_short((unsigned char *)(x) + 6)
1430 #define get_ipproto(x) (((unsigned char *)(x))[9])
1431 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1432 #define get_tcpflags(x) (((unsigned char *)(x))[13])
1435 ip_active_pkt(pkt, len)
1444 if (len < IP_HDRLEN)
1446 if ((get_ipoff(pkt) & IP_OFFMASK) != 0)
1448 if (get_ipproto(pkt) != IPPROTO_TCP)
1450 hlen = get_iphl(pkt) * 4;
1451 if (len < hlen + TCP_HDRLEN)
1454 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4)