1 /*****************************************************************************
2 * ipcp.c - Network PPP IP Control Protocol program file.
4 * Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
5 * portions Copyright (c) 1997 by Global Election Systems Inc.
7 * The authors hereby grant permission to use, copy, modify, distribute,
8 * and license this software and its documentation for any purpose, provided
9 * that existing copyright notices are retained in all copies and that this
10 * notice and the following disclaimer are included verbatim in any
11 * distributions. No written agreement, license, or royalty fee is required
12 * for any of the authorized uses.
14 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 ******************************************************************************
28 * 03-01-01 Marc Boucher <marc@mbsi.ca>
30 * 97-12-08 Guy Lancaster <lancasterg@acm.org>, Global Election Systems Inc.
32 *****************************************************************************/
34 * ipcp.c - PPP IP Control Protocol.
36 * Copyright (c) 1989 Carnegie Mellon University.
37 * All rights reserved.
39 * Redistribution and use in source and binary forms are permitted
40 * provided that the above copyright notice and this paragraph are
41 * duplicated in all such forms and that any documentation,
42 * advertising materials, and other materials related to such
43 * distribution and use acknowledge that the software was developed
44 * by Carnegie Mellon University. The name of the
45 * University may not be used to endorse or promote products derived
46 * from this software without specific prior written permission.
47 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
48 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
49 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
54 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
66 /*************************/
67 /*** LOCAL DEFINITIONS ***/
68 /*************************/
69 /* #define OLD_CI_ADDRS 1 */ /* Support deprecated address negotiation. */
72 * Lengths of configuration options.
75 #define CILEN_COMPRESS 4 /* min length for compression protocol opt. */
76 #define CILEN_VJ 6 /* length for RFC1332 Van-Jacobson opt. */
77 #define CILEN_ADDR 6 /* new-style single address option */
78 #define CILEN_ADDRS 10 /* old-style dual address option */
82 /***********************************/
83 /*** LOCAL FUNCTION DECLARATIONS ***/
84 /***********************************/
86 * Callbacks for fsm code. (CI = Configuration Information)
88 static void ipcp_resetci (fsm *); /* Reset our CI */
89 static int ipcp_cilen (fsm *); /* Return length of our CI */
90 static void ipcp_addci (fsm *, u_char *, int *); /* Add our CI */
91 static int ipcp_ackci (fsm *, u_char *, int); /* Peer ack'd our CI */
92 static int ipcp_nakci (fsm *, u_char *, int); /* Peer nak'd our CI */
93 static int ipcp_rejci (fsm *, u_char *, int); /* Peer rej'd our CI */
94 static int ipcp_reqci (fsm *, u_char *, int *, int); /* Rcv CI */
95 static void ipcp_up (fsm *); /* We're UP */
96 static void ipcp_down (fsm *); /* We're DOWN */
98 static void ipcp_script (fsm *, char *); /* Run an up/down script */
100 static void ipcp_finished (fsm *); /* Don't need lower layer */
103 * Protocol entry points from main code.
105 static void ipcp_init (int);
106 static void ipcp_open (int);
107 static void ipcp_close (int, char *);
108 static void ipcp_lowerup (int);
109 static void ipcp_lowerdown (int);
110 static void ipcp_input (int, u_char *, int);
111 static void ipcp_protrej (int);
113 static void ipcp_clear_addrs (int);
115 #define CODENAME(x) ((x) == CONFACK ? "ACK" : \
116 (x) == CONFNAK ? "NAK" : "REJ")
120 /******************************/
121 /*** PUBLIC DATA STRUCTURES ***/
122 /******************************/
124 ipcp_options ipcp_wantoptions[NUM_PPP]; /* Options that we want to request */
125 ipcp_options ipcp_gotoptions[NUM_PPP]; /* Options that peer ack'd */
126 ipcp_options ipcp_allowoptions[NUM_PPP]; /* Options we allow peer to request */
127 ipcp_options ipcp_hisoptions[NUM_PPP]; /* Options that we ack'd */
129 fsm ipcp_fsm[NUM_PPP]; /* IPCP fsm structure */
131 struct protent ipcp_protent = {
155 /*****************************/
156 /*** LOCAL DATA STRUCTURES ***/
157 /*****************************/
159 static int cis_received[NUM_PPP]; /* # Conf-Reqs received */
160 static int default_route_set[NUM_PPP]; /* Have set up a default route */
162 static fsm_callbacks ipcp_callbacks = { /* IPCP callback routines */
163 ipcp_resetci, /* Reset our Configuration Information */
164 ipcp_cilen, /* Length of our Configuration Information */
165 ipcp_addci, /* Add our Configuration Information */
166 ipcp_ackci, /* ACK our Configuration Information */
167 ipcp_nakci, /* NAK our Configuration Information */
168 ipcp_rejci, /* Reject our Configuration Information */
169 ipcp_reqci, /* Request peer's Configuration Information */
170 ipcp_up, /* Called when fsm reaches LS_OPENED state */
171 ipcp_down, /* Called when fsm leaves LS_OPENED state */
172 NULL, /* Called when we want the lower layer up */
173 ipcp_finished, /* Called when we want the lower layer down */
174 NULL, /* Called when Protocol-Reject received */
175 NULL, /* Retransmission is necessary */
176 NULL, /* Called to handle protocol-specific codes */
177 "IPCP" /* String name of protocol */
182 /**********************************/
183 /*** LOCAL FUNCTION DEFINITIONS ***/
184 /**********************************/
186 #define inet_ntoa(addr) ip_ntoa(((struct ip_addr*)&(addr)))
189 * ipcp_init - Initialize IPCP.
194 fsm *f = &ipcp_fsm[unit];
195 ipcp_options *wo = &ipcp_wantoptions[unit];
196 ipcp_options *ao = &ipcp_allowoptions[unit];
199 f->protocol = PPP_IPCP;
200 f->callbacks = &ipcp_callbacks;
201 fsm_init(&ipcp_fsm[unit]);
203 memset(wo, 0, sizeof(*wo));
204 memset(ao, 0, sizeof(*ao));
210 #else /* VJ_SUPPORT */
212 #endif /* VJ_SUPPORT */
213 wo->vj_protocol = IPCP_VJ_COMP;
214 wo->maxslotindex = MAX_SLOTS - 1;
216 wo->default_route = 1;
221 #else /* VJ_SUPPORT */
223 #endif /* VJ_SUPPORT */
224 ao->maxslotindex = MAX_SLOTS - 1;
226 ao->default_route = 1;
231 * ipcp_open - IPCP is allowed to come up.
236 fsm_open(&ipcp_fsm[unit]);
241 * ipcp_close - Take IPCP down.
244 ipcp_close(int unit, char *reason)
246 fsm_close(&ipcp_fsm[unit], reason);
251 * ipcp_lowerup - The lower layer is up.
254 ipcp_lowerup(int unit)
256 fsm_lowerup(&ipcp_fsm[unit]);
261 * ipcp_lowerdown - The lower layer is down.
264 ipcp_lowerdown(int unit)
266 fsm_lowerdown(&ipcp_fsm[unit]);
271 * ipcp_input - Input IPCP packet.
274 ipcp_input(int unit, u_char *p, int len)
276 fsm_input(&ipcp_fsm[unit], p, len);
281 * ipcp_protrej - A Protocol-Reject was received for IPCP.
283 * Pretend the lower layer went down, so we shut up.
286 ipcp_protrej(int unit)
288 fsm_lowerdown(&ipcp_fsm[unit]);
293 * ipcp_resetci - Reset our CI.
298 ipcp_options *wo = &ipcp_wantoptions[f->unit];
300 wo->req_addr = wo->neg_addr && ipcp_allowoptions[f->unit].neg_addr;
301 if (wo->ouraddr == 0) {
302 wo->accept_local = 1;
304 if (wo->hisaddr == 0) {
305 wo->accept_remote = 1;
307 /* Request DNS addresses from the peer */
308 wo->req_dns1 = ppp_settings.usepeerdns;
309 wo->req_dns2 = ppp_settings.usepeerdns;
310 ipcp_gotoptions[f->unit] = *wo;
311 cis_received[f->unit] = 0;
316 * ipcp_cilen - Return length of our CI.
321 ipcp_options *go = &ipcp_gotoptions[f->unit];
322 ipcp_options *wo = &ipcp_wantoptions[f->unit];
323 ipcp_options *ho = &ipcp_hisoptions[f->unit];
325 #define LENCIVJ(neg, old) (neg ? (old? CILEN_COMPRESS : CILEN_VJ) : 0)
326 #define LENCIADDR(neg, old) (neg ? (old? CILEN_ADDRS : CILEN_ADDR) : 0)
327 #define LENCIDNS(neg) (neg ? (CILEN_ADDR) : 0)
330 * First see if we want to change our options to the old
331 * forms because we have received old forms from the peer.
333 if (wo->neg_addr && !go->neg_addr && !go->old_addrs) {
334 /* use the old style of address negotiation */
338 if (wo->neg_vj && !go->neg_vj && !go->old_vj) {
339 /* try an older style of VJ negotiation */
340 if (cis_received[f->unit] == 0) {
341 /* keep trying the new style until we see some CI from the peer */
344 /* use the old style only if the peer did */
345 if (ho->neg_vj && ho->old_vj) {
348 go->vj_protocol = ho->vj_protocol;
353 return (LENCIADDR(go->neg_addr, go->old_addrs) +
354 LENCIVJ(go->neg_vj, go->old_vj) +
355 LENCIDNS(go->req_dns1) +
356 LENCIDNS(go->req_dns2));
361 * ipcp_addci - Add our desired CIs to a packet.
364 ipcp_addci(fsm *f, u_char *ucp, int *lenp)
366 ipcp_options *go = &ipcp_gotoptions[f->unit];
369 #define ADDCIVJ(opt, neg, val, old, maxslotindex, cflag) \
371 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
372 if (len >= vjlen) { \
374 PUTCHAR(vjlen, ucp); \
375 PUTSHORT(val, ucp); \
377 PUTCHAR(maxslotindex, ucp); \
378 PUTCHAR(cflag, ucp); \
386 #define ADDCIADDR(opt, neg, old, val1, val2) \
388 int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
389 if (len >= addrlen) { \
392 PUTCHAR(addrlen, ucp); \
405 #define ADDCIDNS(opt, neg, addr) \
407 if (len >= CILEN_ADDR) { \
410 PUTCHAR(CILEN_ADDR, ucp); \
419 ADDCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
420 go->old_addrs, go->ouraddr, go->hisaddr);
422 ADDCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
423 go->maxslotindex, go->cflag);
425 ADDCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
427 ADDCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
434 * ipcp_ackci - Ack our CIs.
441 ipcp_ackci(fsm *f, u_char *p, int len)
443 ipcp_options *go = &ipcp_gotoptions[f->unit];
444 u_short cilen, citype, cishort;
446 u_char cimaxslotindex, cicflag;
449 * CIs must be in exactly the same order that we sent...
450 * Check packet length and CI length at each step.
451 * If we find any deviations, then this packet is bad.
454 #define ACKCIVJ(opt, neg, val, old, maxslotindex, cflag) \
456 int vjlen = old? CILEN_COMPRESS : CILEN_VJ; \
457 if ((len -= vjlen) < 0) { \
460 GETCHAR(citype, p); \
462 if (cilen != vjlen || \
466 GETSHORT(cishort, p); \
467 if (cishort != val) { \
471 GETCHAR(cimaxslotindex, p); \
472 if (cimaxslotindex != maxslotindex) { \
475 GETCHAR(cicflag, p); \
476 if (cicflag != cflag) { \
482 #define ACKCIADDR(opt, neg, old, val1, val2) \
484 int addrlen = (old? CILEN_ADDRS: CILEN_ADDR); \
486 if ((len -= addrlen) < 0) { \
489 GETCHAR(citype, p); \
491 if (cilen != addrlen || \
497 if (val1 != cilong) { \
503 if (val2 != cilong) { \
509 #define ACKCIDNS(opt, neg, addr) \
512 if ((len -= CILEN_ADDR) < 0) { \
515 GETCHAR(citype, p); \
517 if (cilen != CILEN_ADDR || \
523 if (addr != cilong) { \
528 ACKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), go->neg_addr,
529 go->old_addrs, go->ouraddr, go->hisaddr);
531 ACKCIVJ(CI_COMPRESSTYPE, go->neg_vj, go->vj_protocol, go->old_vj,
532 go->maxslotindex, go->cflag);
534 ACKCIDNS(CI_MS_DNS1, go->req_dns1, go->dnsaddr[0]);
536 ACKCIDNS(CI_MS_DNS2, go->req_dns2, go->dnsaddr[1]);
539 * If there are any remaining CIs, then this packet is bad.
547 IPCPDEBUG((LOG_INFO, "ipcp_ackci: received bad Ack!\n"));
552 * ipcp_nakci - Peer has sent a NAK for some of our CIs.
553 * This should not modify any state if the Nak is bad
554 * or if IPCP is in the LS_OPENED state.
561 ipcp_nakci(fsm *f, u_char *p, int len)
563 ipcp_options *go = &ipcp_gotoptions[f->unit];
564 u_char cimaxslotindex, cicflag;
565 u_char citype, cilen, *next;
567 u32_t ciaddr1, ciaddr2, l, cidnsaddr;
568 ipcp_options no; /* options we've seen Naks for */
569 ipcp_options try; /* options to request next time */
571 BZERO(&no, sizeof(no));
575 * Any Nak'd CIs must be in exactly the same order that we sent.
576 * Check packet length and CI length at each step.
577 * If we find any deviations, then this packet is bad.
579 #define NAKCIADDR(opt, neg, old, code) \
581 len >= (cilen = (old? CILEN_ADDRS: CILEN_ADDR)) && \
587 ciaddr1 = htonl(l); \
590 ciaddr2 = htonl(l); \
599 #define NAKCIVJ(opt, neg, code) \
601 ((cilen = p[1]) == CILEN_COMPRESS || cilen == CILEN_VJ) && \
606 GETSHORT(cishort, p); \
611 #define NAKCIDNS(opt, neg, code) \
613 ((cilen = p[1]) == CILEN_ADDR) && \
619 cidnsaddr = htonl(l); \
625 * Accept the peer's idea of {our,his} address, if different
626 * from our idea, only if the accept_{local,remote} flag is set.
628 NAKCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr, go->old_addrs,
629 if (go->accept_local && ciaddr1) { /* Do we know our address? */
630 try.ouraddr = ciaddr1;
631 IPCPDEBUG((LOG_INFO, "local IP address %s\n",
632 inet_ntoa(ciaddr1)));
634 if (go->accept_remote && ciaddr2) { /* Does he know his? */
635 try.hisaddr = ciaddr2;
636 IPCPDEBUG((LOG_INFO, "remote IP address %s\n",
637 inet_ntoa(ciaddr2)));
642 * Accept the peer's value of maxslotindex provided that it
643 * is less than what we asked for. Turn off slot-ID compression
644 * if the peer wants. Send old-style compress-type option if
647 NAKCIVJ(CI_COMPRESSTYPE, neg_vj,
648 if (cilen == CILEN_VJ) {
649 GETCHAR(cimaxslotindex, p);
651 if (cishort == IPCP_VJ_COMP) {
653 if (cimaxslotindex < go->maxslotindex) {
654 try.maxslotindex = cimaxslotindex;
663 if (cishort == IPCP_VJ_COMP || cishort == IPCP_VJ_COMP_OLD) {
665 try.vj_protocol = cishort;
672 NAKCIDNS(CI_MS_DNS1, req_dns1,
673 try.dnsaddr[0] = cidnsaddr;
674 IPCPDEBUG((LOG_INFO, "primary DNS address %s\n", inet_ntoa(cidnsaddr)));
677 NAKCIDNS(CI_MS_DNS2, req_dns2,
678 try.dnsaddr[1] = cidnsaddr;
679 IPCPDEBUG((LOG_INFO, "secondary DNS address %s\n", inet_ntoa(cidnsaddr)));
683 * There may be remaining CIs, if the peer is requesting negotiation
684 * on an option that we didn't include in our request packet.
685 * If they want to negotiate about IP addresses, we comply.
686 * If they want us to ask for compression, we refuse.
688 while (len > CILEN_VOID) {
691 if( (len -= cilen) < 0 ) {
694 next = p + cilen - 2;
697 case CI_COMPRESSTYPE:
698 if (go->neg_vj || no.neg_vj ||
699 (cilen != CILEN_VJ && cilen != CILEN_COMPRESS)) {
705 if ((go->neg_addr && go->old_addrs) || no.old_addrs
706 || cilen != CILEN_ADDRS) {
713 if (ciaddr1 && go->accept_local) {
714 try.ouraddr = ciaddr1;
718 if (ciaddr2 && go->accept_remote) {
719 try.hisaddr = ciaddr2;
724 if (go->neg_addr || no.neg_addr || cilen != CILEN_ADDR) {
730 if (ciaddr1 && go->accept_local) {
731 try.ouraddr = ciaddr1;
733 if (try.ouraddr != 0) {
742 /* If there is still anything left, this packet is bad. */
748 * OK, the Nak is good. Now we can update state.
750 if (f->state != LS_OPENED) {
757 IPCPDEBUG((LOG_INFO, "ipcp_nakci: received bad Nak!\n"));
763 * ipcp_rejci - Reject some of our CIs.
766 ipcp_rejci(fsm *f, u_char *p, int len)
768 ipcp_options *go = &ipcp_gotoptions[f->unit];
769 u_char cimaxslotindex, ciflag, cilen;
772 ipcp_options try; /* options to request next time */
776 * Any Rejected CIs must be in exactly the same order that we sent.
777 * Check packet length and CI length at each step.
778 * If we find any deviations, then this packet is bad.
780 #define REJCIADDR(opt, neg, old, val1, val2) \
782 len >= (cilen = old? CILEN_ADDRS: CILEN_ADDR) && \
790 /* Check rejected value. */ \
791 if (cilong != val1) { \
797 /* Check rejected value. */ \
798 if (cilong != val2) { \
805 #define REJCIVJ(opt, neg, val, old, maxslot, cflag) \
807 p[1] == (old? CILEN_COMPRESS : CILEN_VJ) && \
812 GETSHORT(cishort, p); \
813 /* Check rejected value. */ \
814 if (cishort != val) { \
818 GETCHAR(cimaxslotindex, p); \
819 if (cimaxslotindex != maxslot) { \
822 GETCHAR(ciflag, p); \
823 if (ciflag != cflag) { \
830 #define REJCIDNS(opt, neg, dnsaddr) \
832 ((cilen = p[1]) == CILEN_ADDR) && \
840 /* Check rejected value. */ \
841 if (cilong != dnsaddr) { \
847 REJCIADDR((go->old_addrs? CI_ADDRS: CI_ADDR), neg_addr,
848 go->old_addrs, go->ouraddr, go->hisaddr);
850 REJCIVJ(CI_COMPRESSTYPE, neg_vj, go->vj_protocol, go->old_vj,
851 go->maxslotindex, go->cflag);
853 REJCIDNS(CI_MS_DNS1, req_dns1, go->dnsaddr[0]);
855 REJCIDNS(CI_MS_DNS2, req_dns2, go->dnsaddr[1]);
858 * If there are any remaining CIs, then this packet is bad.
864 * Now we can update state.
866 if (f->state != LS_OPENED) {
872 IPCPDEBUG((LOG_INFO, "ipcp_rejci: received bad Reject!\n"));
878 * ipcp_reqci - Check the peer's requested CIs and send appropriate response.
880 * Returns: CONFACK, CONFNAK or CONFREJ and input packet modified
881 * appropriately. If reject_if_disagree is non-zero, doesn't return
882 * CONFNAK; returns CONFREJ if it can't return CONFACK.
885 ipcp_reqci(fsm *f, u_char *inp/* Requested CIs */,int *len/* Length of requested CIs */,int reject_if_disagree)
887 ipcp_options *wo = &ipcp_wantoptions[f->unit];
888 ipcp_options *ho = &ipcp_hisoptions[f->unit];
889 ipcp_options *ao = &ipcp_allowoptions[f->unit];
891 ipcp_options *go = &ipcp_gotoptions[f->unit];
893 u_char *cip, *next; /* Pointer to current and next CIs */
894 u_short cilen, citype; /* Parsed len, type */
895 u_short cishort; /* Parsed short value */
896 u32_t tl, ciaddr1; /* Parsed address values */
898 u32_t ciaddr2; /* Parsed address values */
900 int rc = CONFACK; /* Final packet return code */
901 int orc; /* Individual option return code */
902 u_char *p; /* Pointer to next char to parse */
903 u_char *ucp = inp; /* Pointer to current output char */
904 int l = *len; /* Length left */
905 u_char maxslotindex, cflag;
908 cis_received[f->unit] = 1;
911 * Reset all his options.
913 BZERO(ho, sizeof(*ho));
916 * Process all his options.
920 orc = CONFACK; /* Assume success */
921 cip = p = next; /* Remember begining of CI */
922 if (l < 2 || /* Not enough data for CI header or */
923 p[1] < 2 || /* CI length too small or */
924 p[1] > l) { /* CI length too big? */
925 IPCPDEBUG((LOG_INFO, "ipcp_reqci: bad CI length!\n"));
926 orc = CONFREJ; /* Reject bad CI */
927 cilen = l; /* Reject till end of packet */
928 l = 0; /* Don't loop again */
931 GETCHAR(citype, p); /* Parse CI type */
932 GETCHAR(cilen, p); /* Parse CI length */
933 l -= cilen; /* Adjust remaining length */
934 next += cilen; /* Step to next CI */
936 switch (citype) { /* Check CI type */
937 #ifdef OLD_CI_ADDRS /* Need to save space... */
939 IPCPDEBUG((LOG_INFO, "ipcp_reqci: received ADDRS\n"));
941 cilen != CILEN_ADDRS) { /* Check CI length */
942 orc = CONFREJ; /* Reject CI */
947 * If he has no address, or if we both have his address but
948 * disagree about it, then NAK it with our idea.
949 * In particular, if we don't know his address, but he does,
952 GETLONG(tl, p); /* Parse source address (his) */
954 IPCPDEBUG((LOG_INFO, "his addr %s\n", inet_ntoa(ciaddr1)));
955 if (ciaddr1 != wo->hisaddr
956 && (ciaddr1 == 0 || !wo->accept_remote)) {
958 if (!reject_if_disagree) {
959 DECPTR(sizeof(u32_t), p);
960 tl = ntohl(wo->hisaddr);
963 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
965 * If neither we nor he knows his address, reject the option.
968 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
973 * If he doesn't know our address, or if we both have our address
974 * but disagree about it, then NAK it with our idea.
976 GETLONG(tl, p); /* Parse desination address (ours) */
978 IPCPDEBUG((LOG_INFO, "our addr %s\n", inet_ntoa(ciaddr2)));
979 if (ciaddr2 != wo->ouraddr) {
980 if (ciaddr2 == 0 || !wo->accept_local) {
982 if (!reject_if_disagree) {
983 DECPTR(sizeof(u32_t), p);
984 tl = ntohl(wo->ouraddr);
988 go->ouraddr = ciaddr2; /* accept peer's idea */
994 ho->hisaddr = ciaddr1;
995 ho->ouraddr = ciaddr2;
1000 if (!ao->neg_addr) {
1001 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Reject ADDR not allowed\n"));
1002 orc = CONFREJ; /* Reject CI */
1004 } else if (cilen != CILEN_ADDR) { /* Check CI length */
1005 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Reject ADDR bad len\n"));
1006 orc = CONFREJ; /* Reject CI */
1011 * If he has no address, or if we both have his address but
1012 * disagree about it, then NAK it with our idea.
1013 * In particular, if we don't know his address, but he does,
1016 GETLONG(tl, p); /* Parse source address (his) */
1017 ciaddr1 = htonl(tl);
1018 if (ciaddr1 != wo->hisaddr
1019 && (ciaddr1 == 0 || !wo->accept_remote)) {
1021 if (!reject_if_disagree) {
1022 DECPTR(sizeof(u32_t), p);
1023 tl = ntohl(wo->hisaddr);
1026 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Nak ADDR %s\n", inet_ntoa(ciaddr1)));
1027 } else if (ciaddr1 == 0 && wo->hisaddr == 0) {
1029 * Don't ACK an address of 0.0.0.0 - reject it instead.
1031 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Reject ADDR %s\n", inet_ntoa(ciaddr1)));
1033 wo->req_addr = 0; /* don't NAK with 0.0.0.0 later */
1038 ho->hisaddr = ciaddr1;
1039 IPCPDEBUG((LOG_INFO, "ipcp_reqci: ADDR %s\n", inet_ntoa(ciaddr1)));
1044 /* Microsoft primary or secondary DNS request */
1045 d = citype == CI_MS_DNS2;
1047 /* If we do not have a DNS address then we cannot send it */
1048 if (ao->dnsaddr[d] == 0 ||
1049 cilen != CILEN_ADDR) { /* Check CI length */
1050 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting DNS%d Request\n", d+1));
1051 orc = CONFREJ; /* Reject CI */
1055 if (htonl(tl) != ao->dnsaddr[d]) {
1056 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Naking DNS%d Request %d\n",
1057 d+1, inet_ntoa(tl)));
1058 DECPTR(sizeof(u32_t), p);
1059 tl = ntohl(ao->dnsaddr[d]);
1063 IPCPDEBUG((LOG_INFO, "ipcp_reqci: received DNS%d Request\n", d+1));
1068 /* Microsoft primary or secondary WINS request */
1069 d = citype == CI_MS_WINS2;
1070 IPCPDEBUG((LOG_INFO, "ipcp_reqci: received WINS%d Request\n", d+1));
1072 /* If we do not have a DNS address then we cannot send it */
1073 if (ao->winsaddr[d] == 0 ||
1074 cilen != CILEN_ADDR) { /* Check CI length */
1075 orc = CONFREJ; /* Reject CI */
1079 if (htonl(tl) != ao->winsaddr[d]) {
1080 DECPTR(sizeof(u32_t), p);
1081 tl = ntohl(ao->winsaddr[d]);
1087 case CI_COMPRESSTYPE:
1089 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting COMPRESSTYPE not allowed\n"));
1092 } else if (cilen != CILEN_VJ && cilen != CILEN_COMPRESS) {
1093 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting COMPRESSTYPE len=%d\n", cilen));
1097 GETSHORT(cishort, p);
1099 if (!(cishort == IPCP_VJ_COMP ||
1100 (cishort == IPCP_VJ_COMP_OLD && cilen == CILEN_COMPRESS))) {
1101 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting COMPRESSTYPE %d\n", cishort));
1107 ho->vj_protocol = cishort;
1108 if (cilen == CILEN_VJ) {
1109 GETCHAR(maxslotindex, p);
1110 if (maxslotindex > ao->maxslotindex) {
1111 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Naking VJ max slot %d\n", maxslotindex));
1113 if (!reject_if_disagree) {
1115 PUTCHAR(ao->maxslotindex, p);
1119 if (cflag && !ao->cflag) {
1120 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Naking VJ cflag %d\n", cflag));
1122 if (!reject_if_disagree) {
1124 PUTCHAR(wo->cflag, p);
1127 ho->maxslotindex = maxslotindex;
1131 ho->maxslotindex = MAX_SLOTS - 1;
1134 IPCPDEBUG((LOG_INFO,
1135 "ipcp_reqci: received COMPRESSTYPE p=%d old=%d maxslot=%d cflag=%d\n",
1136 ho->vj_protocol, ho->old_vj, ho->maxslotindex, ho->cflag));
1140 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting unknown CI type %d\n", citype));
1146 if (orc == CONFACK && /* Good CI */
1147 rc != CONFACK) { /* but prior CI wasnt? */
1148 continue; /* Don't send this one */
1151 if (orc == CONFNAK) { /* Nak this CI? */
1152 if (reject_if_disagree) { /* Getting fed up with sending NAKs? */
1153 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Rejecting too many naks\n"));
1154 orc = CONFREJ; /* Get tough if so */
1156 if (rc == CONFREJ) { /* Rejecting prior CI? */
1157 continue; /* Don't send this one */
1159 if (rc == CONFACK) { /* Ack'd all prior CIs? */
1160 rc = CONFNAK; /* Not anymore... */
1161 ucp = inp; /* Backup */
1166 if (orc == CONFREJ && /* Reject this CI */
1167 rc != CONFREJ) { /* but no prior ones? */
1169 ucp = inp; /* Backup */
1172 /* Need to move CI? */
1174 BCOPY(cip, ucp, cilen); /* Move it */
1177 /* Update output pointer */
1182 * If we aren't rejecting this packet, and we want to negotiate
1183 * their address, and they didn't send their address, then we
1184 * send a NAK with a CI_ADDR option appended. We assume the
1185 * input buffer is long enough that we can append the extra
1188 if (rc != CONFREJ && !ho->neg_addr &&
1189 wo->req_addr && !reject_if_disagree) {
1190 IPCPDEBUG((LOG_INFO, "ipcp_reqci: Requesting peer address\n"));
1191 if (rc == CONFACK) {
1193 ucp = inp; /* reset pointer */
1194 wo->req_addr = 0; /* don't ask again */
1196 PUTCHAR(CI_ADDR, ucp);
1197 PUTCHAR(CILEN_ADDR, ucp);
1198 tl = ntohl(wo->hisaddr);
1202 *len = (int)(ucp - inp); /* Compute output length */
1203 IPCPDEBUG((LOG_INFO, "ipcp_reqci: returning Configure-%s\n", CODENAME(rc)));
1204 return (rc); /* Return final code */
1210 * ip_check_options - check that any IP-related options are OK,
1211 * and assign appropriate defaults.
1214 ip_check_options(u_long localAddr)
1216 ipcp_options *wo = &ipcp_wantoptions[0];
1219 * Load our default IP address but allow the remote host to give us
1222 if (wo->ouraddr == 0 && !ppp_settings.disable_defaultip) {
1223 wo->accept_local = 1; /* don't insist on this default value */
1224 wo->ouraddr = htonl(localAddr);
1231 * ipcp_up - IPCP has come UP.
1233 * Configure the IP network interface appropriately and bring it up.
1239 ipcp_options *ho = &ipcp_hisoptions[f->unit];
1240 ipcp_options *go = &ipcp_gotoptions[f->unit];
1241 ipcp_options *wo = &ipcp_wantoptions[f->unit];
1243 np_up(f->unit, PPP_IP);
1244 IPCPDEBUG((LOG_INFO, "ipcp: up\n"));
1247 * We must have a non-zero IP address for both ends of the link.
1249 if (!ho->neg_addr) {
1250 ho->hisaddr = wo->hisaddr;
1253 if (ho->hisaddr == 0) {
1254 IPCPDEBUG((LOG_ERR, "Could not determine remote IP address\n"));
1255 ipcp_close(f->unit, "Could not determine remote IP address");
1258 if (go->ouraddr == 0) {
1259 IPCPDEBUG((LOG_ERR, "Could not determine local IP address\n"));
1260 ipcp_close(f->unit, "Could not determine local IP address");
1264 if (ppp_settings.usepeerdns && (go->dnsaddr[0] || go->dnsaddr[1])) {
1265 /*pppGotDNSAddrs(go->dnsaddr[0], go->dnsaddr[1]);*/
1269 * Check that the peer is allowed to use the IP address it wants.
1271 if (!auth_ip_addr(f->unit, ho->hisaddr)) {
1272 IPCPDEBUG((LOG_ERR, "Peer is not authorized to use remote address %s\n",
1273 inet_ntoa(ho->hisaddr)));
1274 ipcp_close(f->unit, "Unauthorized remote IP address");
1278 /* set tcp compression */
1279 sifvjcomp(f->unit, ho->neg_vj, ho->cflag, ho->maxslotindex);
1282 * Set IP addresses and (if specified) netmask.
1284 mask = GetMask(go->ouraddr);
1286 if (!sifaddr(f->unit, go->ouraddr, ho->hisaddr, mask, go->dnsaddr[0], go->dnsaddr[1])) {
1287 IPCPDEBUG((LOG_WARNING, "sifaddr failed\n"));
1288 ipcp_close(f->unit, "Interface configuration failed");
1292 /* bring the interface up for IP */
1293 if (!sifup(f->unit)) {
1294 IPCPDEBUG((LOG_WARNING, "sifup failed\n"));
1295 ipcp_close(f->unit, "Interface configuration failed");
1299 sifnpmode(f->unit, PPP_IP, NPMODE_PASS);
1301 /* assign a default route through the interface if required */
1302 if (ipcp_wantoptions[f->unit].default_route) {
1303 if (sifdefaultroute(f->unit, go->ouraddr, ho->hisaddr)) {
1304 default_route_set[f->unit] = 1;
1308 IPCPDEBUG((LOG_NOTICE, "local IP address %s\n", inet_ntoa(go->ouraddr)));
1309 IPCPDEBUG((LOG_NOTICE, "remote IP address %s\n", inet_ntoa(ho->hisaddr)));
1310 if (go->dnsaddr[0]) {
1311 IPCPDEBUG((LOG_NOTICE, "primary DNS address %s\n", inet_ntoa(go->dnsaddr[0])));
1313 if (go->dnsaddr[1]) {
1314 IPCPDEBUG((LOG_NOTICE, "secondary DNS address %s\n", inet_ntoa(go->dnsaddr[1])));
1320 * ipcp_down - IPCP has gone DOWN.
1322 * Take the IP network interface down, clear its addresses
1323 * and delete routes through it.
1328 IPCPDEBUG((LOG_INFO, "ipcp: down\n"));
1329 np_down(f->unit, PPP_IP);
1330 sifvjcomp(f->unit, 0, 0, 0);
1333 ipcp_clear_addrs(f->unit);
1338 * ipcp_clear_addrs() - clear the interface addresses, routes, etc.
1341 ipcp_clear_addrs(int unit)
1343 u32_t ouraddr, hisaddr;
1345 ouraddr = ipcp_gotoptions[unit].ouraddr;
1346 hisaddr = ipcp_hisoptions[unit].hisaddr;
1347 if (default_route_set[unit]) {
1348 cifdefaultroute(unit, ouraddr, hisaddr);
1349 default_route_set[unit] = 0;
1351 cifaddr(unit, ouraddr, hisaddr);
1356 * ipcp_finished - possibly shut down the lower layers.
1359 ipcp_finished(fsm *f)
1361 np_finished(f->unit, PPP_IP);
1366 ipcp_printpkt(u_char *p, int plen, void (*printer) (void *, char *, ...), void *arg)
1369 LWIP_UNUSED_ARG(plen);
1370 LWIP_UNUSED_ARG(printer);
1371 LWIP_UNUSED_ARG(arg);
1376 * ip_active_pkt - see if this IP packet is worth bringing the link up for.
1377 * We don't bring the link up for IP fragments or for TCP FIN packets
1380 #define IP_HDRLEN 20 /* bytes */
1381 #define IP_OFFMASK 0x1fff
1382 #define IPPROTO_TCP 6
1383 #define TCP_HDRLEN 20
1387 * We use these macros because the IP header may be at an odd address,
1388 * and some compilers might use word loads to get th_off or ip_hl.
1391 #define net_short(x) (((x)[0] << 8) + (x)[1])
1392 #define get_iphl(x) (((unsigned char *)(x))[0] & 0xF)
1393 #define get_ipoff(x) net_short((unsigned char *)(x) + 6)
1394 #define get_ipproto(x) (((unsigned char *)(x))[9])
1395 #define get_tcpoff(x) (((unsigned char *)(x))[12] >> 4)
1396 #define get_tcpflags(x) (((unsigned char *)(x))[13])
1399 ip_active_pkt(u_char *pkt, int len)
1406 if (len < IP_HDRLEN) {
1409 if ((get_ipoff(pkt) & IP_OFFMASK) != 0) {
1412 if (get_ipproto(pkt) != IPPROTO_TCP) {
1415 hlen = get_iphl(pkt) * 4;
1416 if (len < hlen + TCP_HDRLEN) {
1420 if ((get_tcpflags(tcp) & TH_FIN) != 0 && len == hlen + get_tcpoff(tcp) * 4) {
1427 #endif /* PPP_SUPPORT */