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 */