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 1.33 1998/03/25 03:08:47 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 = {
122 static void ipcp_clear_addrs __P((int));
125 * Lengths of configuration options.
128 #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */
129 #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */
130 #define CILEN_ADDR 6 /* new-style single address option */
131 #define CILEN_ADDRS 10 /* old-style dual address option */
134 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
135 (x) == CONFNAK ? "NAK" : "REJ")
139 * Make a string representation of a network IP address.
147 ipaddr = ntohl(ipaddr);
149 sprintf(b, "%d.%d.%d.%d",
150 (u_char)(ipaddr >> 24),
151 (u_char)(ipaddr >> 16),
152 (u_char)(ipaddr >> 8),
159 * ipcp_init - Initialize IPCP.
165 fsm *f = &ipcp_fsm[unit];
166 ipcp_options *wo = &ipcp_wantoptions[unit];
167 ipcp_options *ao = &ipcp_allowoptions[unit];
170 f->protocol = PPP_IPCP;
171 f->callbacks = &ipcp_callbacks;
172 fsm_init(&ipcp_fsm[unit]);
174 memset(wo, 0, sizeof(*wo));
175 memset(ao, 0, sizeof(*ao));
179 wo->vj_protocol = IPCP_VJ_COMP;
180 wo->maxslotindex = MAX_STATES - 1; /* really max index */
183 /* max slots and slot-id compression are currently hardwired in */
184 /* ppp_if.c to 16 and 1, this needs to be changed (among other */
189 ao->maxslotindex = MAX_STATES - 1;
193 * XXX These control whether the user may use the proxyarp
194 * and defaultroute options.
197 ao->default_route = 1;
202 * ipcp_open - IPCP is allowed to come up.
208 fsm_open(&ipcp_fsm[unit]);
213 * ipcp_close - Take IPCP down.
216 ipcp_close(unit, reason)
220 fsm_close(&ipcp_fsm[unit], reason);
225 * ipcp_lowerup - The lower layer is up.
231 fsm_lowerup(&ipcp_fsm[unit]);
236 * ipcp_lowerdown - The lower layer is down.
242 fsm_lowerdown(&ipcp_fsm[unit]);
247 * ipcp_input - Input IPCP packet.
250 ipcp_input(unit, p, len)
255 fsm_input(&ipcp_fsm[unit], p, len);
260 * ipcp_protrej - A Protocol-Reject was received for IPCP.
262 * Pretend the lower layer went down, so we shut up.
268 fsm_lowerdown(&ipcp_fsm[unit]);
273 * ipcp_resetci - Reset our CI.
279 ipcp_options *wo = &ipcp_wantoptions[f->unit];
281 wo->req_addr = wo->neg_addr && ipcp_allowoptions[f->unit].neg_addr;
282 if (wo->ouraddr == 0)
283 wo->accept_local = 1;
284 if (wo->hisaddr == 0)
285 wo->accept_remote = 1;
286 ipcp_gotoptions[f->unit] = *wo;
287 cis_received[f->unit] = 0;
292 * ipcp_cilen - Return length of our CI.
298 ipcp_options *go = &ipcp_gotoptions[f->unit];
299 ipcp_options *wo = &ipcp_wantoptions[f->unit];
300 ipcp_options *ho = &ipcp_hisoptions[f->unit];
302 #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
303 #define LENCIADDR(neg, old) (neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 0)
306 * First see if we want to change our options to the old
307 * forms because we have received old forms from the peer.
309 if (wo->neg_addr && !go->neg_addr && !go->old_addrs) {
310 /* use the old style of address negotiation */
314 if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
315 /* try an older style of VJ negotiation */
316 if (cis_received[f->unit] == 0) {
317 /* keep trying the new style until we see some CI from the peer */
320 /* use the old style only if the peer did */
321 if (ho->neg_vj && ho->old_vj) {
324 go->vj_protocol = ho->vj_protocol;
329 return (LENCIADDR(go->neg_addr, go->old_addrs) +
330 LENCIVJ(go->neg_vj, go->old_vj));
335 * ipcp_addci - Add our desired CIs to a packet.
338 ipcp_addci(f, ucp, lenp)
343 ipcp_options *go = &ipcp_gotoptions[f->unit];
346 #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
348 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
349 if (len >= vjlen) { \
351 PUTCHAR(vjlen, ucp); \
352 PUTSHORT(val, ucp); \
354 PUTCHAR(maxslotindex, ucp); \
355 PUTCHAR(cflag, ucp); \
362 #define ADDCIADDR(opt, neg, old, val1, val2) \
364 int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
365 if (len >= addrlen) { \
368 PUTCHAR(addrlen, ucp); \
380 ADDCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
381 go->old_addrs, go->ouraddr, go->hisaddr);
383 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
384 go->maxslotindex, go->cflag);
391 * ipcp_ackci - Ack our CIs.
398 ipcp_ackci(f, p, len)
403 ipcp_options *go = &ipcp_gotoptions[f->unit];
404 u_short cilen, citype, cishort;
406 u_char cimaxslotindex, cicflag;
409 * CIs must be in exactly the same order that we sent...
410 * Check packet length and CI length at each step.
411 * If we find any deviations, then this packet is bad.
414 #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
416 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
417 if ((len -= vjlen) < 0) \
419 GETCHAR(citype, p); \
421 if (cilen != vjlen || \
424 GETSHORT(cishort, p); \
425 if (cishort != val) \
428 GETCHAR(cimaxslotindex, p); \
429 if (cimaxslotindex != maxslotindex) \
431 GETCHAR(cicflag, p); \
432 if (cicflag != cflag) \
437 #define ACKCIADDR(opt, neg, old, val1, val2) \
439 int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
441 if ((len -= addrlen) < 0) \
443 GETCHAR(citype, p); \
445 if (cilen != addrlen || \
450 if (val1 != cilong) \
455 if (val2 != cilong) \
460 ACKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
461 go->old_addrs, go->ouraddr, go->hisaddr);
463 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
464 go->maxslotindex, go->cflag);
467 * If there are any remaining CIs, then this packet is bad.
474 IPCPDEBUG((LOG_INFO, "ipcp_ackci: received bad Ack!"));
479 * ipcp_nakci - Peer has sent a NAK for some of our CIs.
480 * This should not modify any state if the Nak is bad
481 * or if IPCP is in the OPENED state.
488 ipcp_nakci(f, p, len)
493 ipcp_options *go = &ipcp_gotoptions[f->unit];
494 u_char cimaxslotindex, cicflag;
495 u_char citype, cilen, *next;
497 u_int32_t ciaddr1, ciaddr2, l;
498 ipcp_options no; /* options we've seen Naks for */
499 ipcp_options try; /* options to request next time */
501 BZERO(&no, sizeof(no));
505 * Any Nak'd CIs must be in exactly the same order that we sent.
506 * Check packet length and CI length at each step.
507 * If we find any deviations, then this packet is bad.
509 #define NAKCIADDR(opt, neg, old, code) \
511 len >= (cilen = (old? CILEN_ADDRS: CILEN_ADDR)) && \
517 ciaddr1 = htonl(l); \
520 ciaddr2 = htonl(l); \
528 #define NAKCIVJ(opt, neg, code) \
530 ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
535 GETSHORT(cishort, p); \
541 * Accept the peer's idea of {our,his} address, if different
542 * from our idea, only if the accept_{local,remote} flag is set.
544 NAKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, go->old_addrs,
545 if (go->accept_local && ciaddr1) { /* Do we know our address? */
546 try.ouraddr = ciaddr1;
547 IPCPDEBUG((LOG_INFO, "local IP address %s",
550 if (go->accept_remote && ciaddr2) { /* Does he know his? */
551 try.hisaddr = ciaddr2;
552 IPCPDEBUG((LOG_INFO, "remote IP address %s",
558 * Accept the peer's value of maxslotindex provided that it
559 * is less than what we asked for. Turn off slot-ID compression
560 * if the peer wants. Send old-style compress-type option if
563 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
564 if (cilen == CILEN_VJ) {
565 GETCHAR(cimaxslotindex, p);
567 if (cishort == IPCP_VJ_COMP) {
569 if (cimaxslotindex < go->maxslotindex)
570 try.maxslotindex = cimaxslotindex;
577 if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
579 try.vj_protocol = cishort;
587 * There may be remaining CIs, if the peer is requesting negotiation
588 * on an option that we didn't include in our request packet.
589 * If they want to negotiate about IP addresses, we comply.
590 * If they want us to ask for compression, we refuse.
592 while (len > CILEN_VOID) {
595 if( (len -= cilen) < 0 )
597 next = p + cilen - 2;
600 case CI_COMPRESSTYPE:
601 if (go->neg_vj || no.neg_vj ||
602 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS))
607 if ((go->neg_addr && go->old_addrs) || no.old_addrs
608 || cilen != CILEN_ADDRS)
614 if (ciaddr1 && go->accept_local)
615 try.ouraddr = ciaddr1;
618 if (ciaddr2 && go->accept_remote)
619 try.hisaddr = ciaddr2;
623 if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR)
628 if (ciaddr1 && go->accept_local)
629 try.ouraddr = ciaddr1;
630 if (try.ouraddr != 0)
638 /* If there is still anything left, this packet is bad. */
643 * OK, the Nak is good. Now we can update state.
645 if (f->state != OPENED)
651 IPCPDEBUG((LOG_INFO, "ipcp_nakci: received bad Nak!"));
657 * ipcp_rejci - Reject some of our CIs.
660 ipcp_rejci(f, p, len)
665 ipcp_options *go = &ipcp_gotoptions[f->unit];
666 u_char cimaxslotindex, ciflag, cilen;
669 ipcp_options try; /* options to request next time */
673 * Any Rejected CIs must be in exactly the same order that we sent.
674 * Check packet length and CI length at each step.
675 * If we find any deviations, then this packet is bad.
677 #define REJCIADDR(opt, neg, old, val1, val2) \
679 len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) && \
687 /* Check rejected value. */ \
688 if (cilong != val1) \
693 /* Check rejected value. */ \
694 if (cilong != val2) \
700 #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
702 p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
707 GETSHORT(cishort, p); \
708 /* Check rejected value. */ \
709 if (cishort != val) \
712 GETCHAR(cimaxslotindex, p); \
713 if (cimaxslotindex != maxslot) \
715 GETCHAR(ciflag, p); \
716 if (ciflag != cflag) \
722 REJCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr,
723 go->old_addrs, go->ouraddr, go->hisaddr);
725 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
726 go->maxslotindex, go->cflag);
729 * If there are any remaining CIs, then this packet is bad.
734 * Now we can update state.
736 if (f->state != OPENED)
741 IPCPDEBUG((LOG_INFO, "ipcp_rejci: received bad Reject!"));
747 * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
749 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
750 * appropriately. If reject_if_disagree is non-zero, doesn't return
751 * CONFNAK; returns CONFREJ if it can't return CONFACK.
754 ipcp_reqci(f, inp, len, reject_if_disagree)
756 u_char *inp; /* Requested CIs */
757 int *len; /* Length of requested CIs */
758 int reject_if_disagree;
760 ipcp_options *wo = &ipcp_wantoptions[f->unit];
761 ipcp_options *ho = &ipcp_hisoptions[f->unit];
762 ipcp_options *ao = &ipcp_allowoptions[f->unit];
763 ipcp_options *go = &ipcp_gotoptions[f->unit];
764 u_char *cip, *next; /* Pointer to current and next CIs */
765 u_short cilen, citype; /* Parsed len, type */
766 u_short cishort; /* Parsed short value */
767 u_int32_t tl, ciaddr1, ciaddr2;/* Parsed address values */
768 int rc = CONFACK; /* Final packet return code */
769 int orc; /* Individual option return code */
770 u_char *p; /* Pointer to next char to parse */
771 u_char *ucp = inp; /* Pointer to current output char */
772 int l = *len; /* Length left */
773 u_char maxslotindex, cflag;
776 cis_received[f->unit] = 1;
779 * Reset all his options.
781 BZERO(ho, sizeof(*ho));
784 * Process all his options.
788 orc = CONFACK; /* Assume success */
789 cip = p = next; /* Remember begining of CI */
790 if (l < 2 || /* Not enough data for CI header or */
791 p[1] < 2 || /* CI length too small or */
792 p[1] > l) { /* CI length too big? */
793 IPCPDEBUG((LOG_INFO, "ipcp_reqci: bad CI length!"));
794 orc = CONFREJ; /* Reject bad CI */
795 cilen = l; /* Reject till end of packet */
796 l = 0; /* Don't loop again */
799 GETCHAR(citype, p); /* Parse CI type */
800 GETCHAR(cilen, p); /* Parse CI length */
801 l -= cilen; /* Adjust remaining length */
802 next += cilen; /* Step to next CI */
804 switch (citype) { /* Check CI type */
806 IPCPDEBUG((LOG_INFO, "ipcp: received ADDRS "));
808 cilen != CILEN_ADDRS) { /* Check CI length */
809 orc = CONFREJ; /* Reject CI */
814 * If he has no address, or if we both have his address but
815 * disagree about it, then NAK it with our idea.
816 * In particular, if we don't know his address, but he does,
819 GETLONG(tl, p); /* Parse source address (his) */
821 IPCPDEBUG((LOG_INFO, "(%s:", ip_ntoa(ciaddr1)));
822 if (ciaddr1 != wo->hisaddr
823 && (ciaddr1 == 0 || !wo->accept_remote)) {
825 if (!reject_if_disagree) {
826 DECPTR(sizeof(u_int32_t), p);
827 tl = ntohl(wo->hisaddr);
830 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
832 * If neither we nor he knows his address, reject the option.
835 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
840 * If he doesn't know our address, or if we both have our address
841 * but disagree about it, then NAK it with our idea.
843 GETLONG(tl, p); /* Parse desination address (ours) */
845 IPCPDEBUG((LOG_INFO, "%s)", ip_ntoa(ciaddr2)));
846 if (ciaddr2 != wo->ouraddr) {
847 if (ciaddr2 == 0 || !wo->accept_local) {
849 if (!reject_if_disagree) {
850 DECPTR(sizeof(u_int32_t), p);
851 tl = ntohl(wo->ouraddr);
855 go->ouraddr = ciaddr2; /* accept peer's idea */
861 ho->hisaddr = ciaddr1;
862 ho->ouraddr = ciaddr2;
866 IPCPDEBUG((LOG_INFO, "ipcp: received ADDR "));
869 cilen != CILEN_ADDR) { /* Check CI length */
870 orc = CONFREJ; /* Reject CI */
875 * If he has no address, or if we both have his address but
876 * disagree about it, then NAK it with our idea.
877 * In particular, if we don't know his address, but he does,
880 GETLONG(tl, p); /* Parse source address (his) */
882 IPCPDEBUG((LOG_INFO, "(%s)", ip_ntoa(ciaddr1)));
883 if (ciaddr1 != wo->hisaddr
884 && (ciaddr1 == 0 || !wo->accept_remote)) {
886 if (!reject_if_disagree) {
887 DECPTR(sizeof(u_int32_t), p);
888 tl = ntohl(wo->hisaddr);
891 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
893 * Don't ACK an address of 0.0.0.0 - reject it instead.
896 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
901 ho->hisaddr = ciaddr1;
906 /* Microsoft primary or secondary DNS request */
907 d = citype == CI_MS_DNS2;
908 IPCPDEBUG((LOG_INFO, "ipcp: received DNS%d Request ", d+1));
910 /* If we do not have a DNS address then we cannot send it */
911 if (ao->dnsaddr[d] == 0 ||
912 cilen != CILEN_ADDR) { /* Check CI length */
913 orc = CONFREJ; /* Reject CI */
917 if (htonl(tl) != ao->dnsaddr[d]) {
918 DECPTR(sizeof(u_int32_t), p);
919 tl = ntohl(ao->dnsaddr[d]);
927 /* Microsoft primary or secondary WINS request */
928 d = citype == CI_MS_WINS2;
929 IPCPDEBUG((LOG_INFO, "ipcp: received WINS%d Request ", d+1));
931 /* If we do not have a DNS address then we cannot send it */
932 if (ao->winsaddr[d] == 0 ||
933 cilen != CILEN_ADDR) { /* Check CI length */
934 orc = CONFREJ; /* Reject CI */
938 if (htonl(tl) != ao->winsaddr[d]) {
939 DECPTR(sizeof(u_int32_t), p);
940 tl = ntohl(ao->winsaddr[d]);
946 case CI_COMPRESSTYPE:
947 IPCPDEBUG((LOG_INFO, "ipcp: received COMPRESSTYPE "));
949 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
953 GETSHORT(cishort, p);
954 IPCPDEBUG((LOG_INFO, "(%d)", cishort));
956 if (!(cishort == IPCP_VJ_COMP ||
957 (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
963 ho->vj_protocol = cishort;
964 if (cilen == CILEN_VJ) {
965 GETCHAR(maxslotindex, p);
966 if (maxslotindex > ao->maxslotindex) {
968 if (!reject_if_disagree){
970 PUTCHAR(ao->maxslotindex, p);
974 if (cflag && !ao->cflag) {
976 if (!reject_if_disagree){
978 PUTCHAR(wo->cflag, p);
981 ho->maxslotindex = maxslotindex;
985 ho->maxslotindex = MAX_STATES - 1;
996 IPCPDEBUG((LOG_INFO, " (%s)\n", CODENAME(orc)));
998 if (orc == CONFACK && /* Good CI */
999 rc != CONFACK) /* but prior CI wasnt? */
1000 continue; /* Don't send this one */
1002 if (orc == CONFNAK) { /* Nak this CI? */
1003 if (reject_if_disagree) /* Getting fed up with sending NAKs? */
1004 orc = CONFREJ; /* Get tough if so */
1006 if (rc == CONFREJ) /* Rejecting prior CI? */
1007 continue; /* Don't send this one */
1008 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1009 rc = CONFNAK; /* Not anymore... */
1010 ucp = inp; /* Backup */
1015 if (orc == CONFREJ && /* Reject this CI */
1016 rc != CONFREJ) { /* but no prior ones? */
1018 ucp = inp; /* Backup */
1021 /* Need to move CI? */
1023 BCOPY(cip, ucp, cilen); /* Move it */
1025 /* Update output pointer */
1030 * If we aren't rejecting this packet, and we want to negotiate
1031 * their address, and they didn't send their address, then we
1032 * send a NAK with a CI_ADDR option appended. We assume the
1033 * input buffer is long enough that we can append the extra
1036 if (rc != CONFREJ && !ho->neg_addr &&
1037 wo->req_addr && !reject_if_disagree) {
1038 if (rc == CONFACK) {
1040 ucp = inp; /* reset pointer */
1041 wo->req_addr = 0; /* don't ask again */
1043 PUTCHAR(CI_ADDR, ucp);
1044 PUTCHAR(CILEN_ADDR, ucp);
1045 tl = ntohl(wo->hisaddr);
1049 *len = ucp - inp; /* Compute output length */
1050 IPCPDEBUG((LOG_INFO, "ipcp: returning Configure-%s", CODENAME(rc)));
1051 return (rc); /* Return final code */
1056 * ip_check_options - check that any IP-related options are OK,
1057 * and assign appropriate defaults.
1064 ipcp_options *wo = &ipcp_wantoptions[0];
1067 * Default our local IP address based on our hostname.
1068 * If local IP address already given, don't bother.
1070 if (wo->ouraddr == 0 && !disable_defaultip) {
1072 * Look up our hostname (possibly with domain name appended)
1073 * and take the first IP address as our local IP address.
1074 * If there isn't an IP address for our hostname, too bad.
1076 wo->accept_local = 1; /* don't insist on this default value */
1077 if ((hp = gethostbyname(hostname)) != NULL) {
1078 local = *(u_int32_t *)hp->h_addr;
1079 if (local != 0 && !bad_ip_adrs(local))
1080 wo->ouraddr = local;
1084 if (demand && wo->hisaddr == 0) {
1085 option_error("remote IP address required for demand-dialling\n");
1089 if (demand && wo->accept_remote) {
1090 option_error("ipcp-accept-remote is incompatible with demand\n");
1098 * ip_demand_conf - configure the interface as though
1099 * IPCP were up, for use with dial-on-demand.
1105 ipcp_options *wo = &ipcp_wantoptions[u];
1107 if (!sifaddr(u, wo->ouraddr, wo->hisaddr, GetMask(wo->ouraddr)))
1111 if (!sifnpmode(u, PPP_IP, NPMODE_QUEUE))
1113 if (wo->default_route)
1114 if (sifdefaultroute(u, wo->ouraddr, wo->hisaddr))
1115 default_route_set[u] = 1;
1117 if (sifproxyarp(u, wo->hisaddr))
1118 proxy_arp_set[u] = 1;
1120 syslog(LOG_NOTICE, "local IP address %s", ip_ntoa(wo->ouraddr));
1121 syslog(LOG_NOTICE, "remote IP address %s", ip_ntoa(wo->hisaddr));
1128 * ipcp_up - IPCP has come UP.
1130 * Configure the IP network interface appropriately and bring it up.
1137 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1138 ipcp_options *go = &ipcp_gotoptions[f->unit];
1139 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1141 np_up(f->unit, PPP_IP);
1142 IPCPDEBUG((LOG_INFO, "ipcp: up"));
1145 * We must have a non-zero IP address for both ends of the link.
1148 ho->hisaddr = wo->hisaddr;
1150 if (ho->hisaddr == 0) {
1151 syslog(LOG_ERR, "Could not determine remote IP address");
1152 ipcp_close(f->unit, "Could not determine remote IP address");
1155 if (go->ouraddr == 0) {
1156 syslog(LOG_ERR, "Could not determine local IP address");
1157 ipcp_close(f->unit, "Could not determine local IP address");
1160 script_setenv("IPLOCAL", ip_ntoa(go->ouraddr));
1161 script_setenv("IPREMOTE", ip_ntoa(ho->hisaddr));
1164 * Check that the peer is allowed to use the IP address it wants.
1166 if (!auth_ip_addr(f->unit, ho->hisaddr)) {
1167 syslog(LOG_ERR, "Peer is not authorized to use remote address %s",
1168 ip_ntoa(ho->hisaddr));
1169 ipcp_close(f->unit, "Unauthorized remote IP address");
1173 /* set tcp compression */
1174 sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
1177 * If we are doing dial-on-demand, the interface is already
1178 * configured, so we put out any saved-up packets, then set the
1179 * interface to pass IP packets.
1182 if (go->ouraddr != wo->ouraddr || ho->hisaddr != wo->hisaddr) {
1183 if (go->ouraddr != wo->ouraddr)
1184 syslog(LOG_WARNING, "Local IP address changed to %s",
1185 ip_ntoa(go->ouraddr));
1186 if (ho->hisaddr != wo->hisaddr)
1187 syslog(LOG_WARNING, "Remote IP address changed to %s",
1188 ip_ntoa(ho->hisaddr));
1189 ipcp_clear_addrs(f->unit);
1191 /* Set the interface to the new addresses */
1192 mask = GetMask(go->ouraddr);
1193 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1194 IPCPDEBUG((LOG_WARNING, "sifaddr failed"));
1195 ipcp_close(f->unit, "Interface configuration failed");
1199 /* assign a default route through the interface if required */
1200 if (ipcp_wantoptions[f->unit].default_route)
1201 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1202 default_route_set[f->unit] = 1;
1204 /* Make a proxy ARP entry if requested. */
1205 if (ipcp_wantoptions[f->unit].proxy_arp)
1206 if (sifproxyarp(f->unit, ho->hisaddr))
1207 proxy_arp_set[f->unit] = 1;
1210 demand_rexmit(PPP_IP);
1211 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1215 * Set IP addresses and (if specified) netmask.
1217 mask = GetMask(go->ouraddr);
1219 #if !(defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1220 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1221 IPCPDEBUG((LOG_WARNING, "sifaddr failed"));
1222 ipcp_close(f->unit, "Interface configuration failed");
1227 /* bring the interface up for IP */
1228 if (!sifup(f->unit)) {
1229 IPCPDEBUG((LOG_WARNING, "sifup failed"));
1230 ipcp_close(f->unit, "Interface configuration failed");
1234 #if (defined(SVR4) && (defined(SNI) || defined(__USLC__)))
1235 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask)) {
1236 IPCPDEBUG((LOG_WARNING, "sifaddr failed"));
1237 ipcp_close(f->unit, "Interface configuration failed");
1241 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1243 /* assign a default route through the interface if required */
1244 if (ipcp_wantoptions[f->unit].default_route)
1245 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr))
1246 default_route_set[f->unit] = 1;
1248 /* Make a proxy ARP entry if requested. */
1249 if (ipcp_wantoptions[f->unit].proxy_arp)
1250 if (sifproxyarp(f->unit, ho->hisaddr))
1251 proxy_arp_set[f->unit] = 1;
1253 syslog(LOG_NOTICE, "local IP address %s", ip_ntoa(go->ouraddr));
1254 syslog(LOG_NOTICE, "remote IP address %s", ip_ntoa(ho->hisaddr));
1258 * Execute the ip-up script, like this:
1259 * /etc/ppp/ip-up interface tty speed local-IP remote-IP
1261 ipcp_script(f, _PATH_IPUP);
1267 * ipcp_down - IPCP has gone DOWN.
1269 * Take the IP network interface down, clear its addresses
1270 * and delete routes through it.
1276 IPCPDEBUG((LOG_INFO, "ipcp: down"));
1277 np_down(f->unit, PPP_IP);
1278 sifvjcomp(f->unit, 0, 0, 0);
1281 * If we are doing dial-on-demand, set the interface
1282 * to queue up outgoing packets (for now).
1285 sifnpmode(f->unit, PPP_IP, NPMODE_QUEUE);
1288 ipcp_clear_addrs(f->unit);
1291 /* Execute the ip-down script */
1292 ipcp_script(f, _PATH_IPDOWN);
1297 * ipcp_clear_addrs() - clear the interface addresses, routes,
1298 * proxy arp entries, etc.
1301 ipcp_clear_addrs(unit)
1304 u_int32_t ouraddr, hisaddr;
1306 ouraddr = ipcp_gotoptions[unit].ouraddr;
1307 hisaddr = ipcp_hisoptions[unit].hisaddr;
1308 if (proxy_arp_set[unit]) {
1309 cifproxyarp(unit, hisaddr);
1310 proxy_arp_set[unit] = 0;
1312 if (default_route_set[unit]) {
1313 cifdefaultroute(unit, ouraddr, hisaddr);
1314 default_route_set[unit] = 0;
1316 cifaddr(unit, ouraddr, hisaddr);
1321 * ipcp_finished - possibly shut down the lower layers.
1327 np_finished(f->unit, PPP_IP);
1332 * ipcp_script - Execute a script with arguments
1333 * interface-name tty-name speed local-IP remote-IP.
1336 ipcp_script(f, script)
1340 char strspeed[32], strlocal[32], strremote[32];
1343 sprintf(strspeed, "%d", baud_rate);
1344 strcpy(strlocal, ip_ntoa(ipcp_gotoptions[f->unit].ouraddr));
1345 strcpy(strremote, ip_ntoa(ipcp_hisoptions[f->unit].hisaddr));
1352 argv[5] = strremote;
1355 run_program(script, argv, 0);
1359 * ipcp_printpkt - print the contents of an IPCP packet.
1361 static char *ipcp_codenames[] = {
1362 "ConfReq", "ConfAck", "ConfNak", "ConfRej",
1363 "TermReq", "TermAck", "CodeRej"
1367 ipcp_printpkt(p, plen, printer, arg)
1370 void (*printer) __P((void *, char *, ...));
1373 int code, id, len, olen;
1374 u_char *pstart, *optend;
1378 if (plen < HEADERLEN)
1384 if (len < HEADERLEN || len > plen)
1387 if (code >= 1 && code <= sizeof(ipcp_codenames) / sizeof(char *))
1388 printer(arg, " %s", ipcp_codenames[code-1]);
1390 printer(arg, " code=0x%x", code);
1391 printer(arg, " id=0x%x", id);
1398 /* print option list */
1403 if (olen < 2 || olen > len) {
1411 if (olen == CILEN_ADDRS) {
1414 printer(arg, "addrs %s", ip_ntoa(htonl(cilong)));
1416 printer(arg, " %s", ip_ntoa(htonl(cilong)));
1419 case CI_COMPRESSTYPE:
1420 if (olen >= CILEN_COMPRESS) {
1422 GETSHORT(cishort, p);
1423 printer(arg, "compress ");
1428 case IPCP_VJ_COMP_OLD:
1429 printer(arg, "old-VJ");
1432 printer(arg, "0x%x", cishort);
1437 if (olen == CILEN_ADDR) {
1440 printer(arg, "addr %s", ip_ntoa(htonl(cilong)));
1447 printer(arg, "dns-addr %s", ip_ntoa(htonl(cilong)));
1453 printer(arg, "wins-addr %s", ip_ntoa(htonl(cilong)));
1456 while (p < optend) {
1458 printer(arg, " %.2x", code);
1466 if (len > 0 && *p >= ' ' && *p < 0x7f) {
1468 print_string(p, len, printer, arg);
1475 /* print the rest of the bytes in the packet */
1476 for (; len > 0; --len) {
1478 printer(arg, " %.2x", code);
1485 * ip_active_pkt - see if this IP packet is worth bringing the link up for.
1486 * We don't bring the link up for IP fragments or for TCP FIN packets
1489 #define IP_HDRLEN 20 /* bytes */
1490 #define IP_OFFMASK 0x1fff
1491 #define IPPROTO_TCP 6
1492 #define TCP_HDRLEN 20
1496 * We use these macros because the IP header may be at an odd address,
1497 * and some compilers might use word loads to get th_off or ip_hl.
1500 #define net_short(x) (((x)[0] << 8) + (x)[1])
1501 #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF)
1502 #define get_ipoff(x) net_short((unsigned char *)(x) + 6)
1503 #define get_ipproto(x) (((unsigned char *)(x))[9])
1504 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1505 #define get_tcpflags(x) (((unsigned char *)(x))[13])
1508 ip_active_pkt(pkt, len)
1517 if (len < IP_HDRLEN)
1519 if ((get_ipoff(pkt) & IP_OFFMASK) != 0)
1521 if (get_ipproto(pkt) != IPPROTO_TCP)
1523 hlen = get_iphl(pkt) * 4;
1524 if (len < hlen + TCP_HDRLEN)
1527 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4)