d7770e500bd1bff9b567ed34c6de9837eddbb930
3 char const *cvs_id_ppp
= "$Id: ppp.c,v 1.87 2005/12/04 13:06:50 bodea Exp $";
11 #include "constants.h"
17 extern tunnelt
*tunnel
;
18 extern sessiont
*session
;
19 extern radiust
*radius
;
21 extern char hostname
[];
22 extern uint32_t eth_tx
;
23 extern time_t time_now
;
24 extern configt
*config
;
26 static int add_lcp_auth(uint8_t *b
, int size
, int authtype
);
28 // Process PAP messages
29 void processpap(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
38 LOG_HEX(5, "PAP", p
, l
);
41 LOG(1, s
, t
, "Short PAP %u bytes\n", l
);
42 STAT(tunnel_rx_errors
);
43 sessionshutdown(s
, "Short PAP packet.", 3, 0);
47 if ((hl
= ntohs(*(uint16_t *) (p
+ 2))) > l
)
49 LOG(1, s
, t
, "Length mismatch PAP %u/%u\n", hl
, l
);
50 STAT(tunnel_rx_errors
);
51 sessionshutdown(s
, "PAP length mismatch.", 3, 0);
58 LOG(1, s
, t
, "Unexpected PAP code %d\n", *p
);
59 STAT(tunnel_rx_errors
);
60 sessionshutdown(s
, "Unexpected PAP code.", 3, 0);
64 if (session
[s
].ppp
.phase
!= Authenticate
)
66 LOG(2, s
, t
, "PAP ignored in %s phase\n", ppp_phase(session
[s
].ppp
.phase
));
73 user
[0] = pass
[0] = 0;
74 if (*b
&& *b
< sizeof(user
))
76 memcpy(user
, b
+ 1, *b
);
79 if (*b
&& *b
< sizeof(pass
))
81 memcpy(pass
, b
+ 1, *b
);
85 LOG(3, s
, t
, "PAP login %s/%s\n", user
, pass
);
88 if (session
[s
].ip
|| !(r
= radiusnew(s
)))
90 // respond now, either no RADIUS available or already authenticated
93 uint8_t *p
= makeppp(b
, sizeof(b
), 0, 0, s
, t
, PPPPAP
);
99 *p
= 3; // cant authorise
101 *(uint16_t *) (p
+ 2) = htons(5); // length
102 p
[4] = 0; // no message
103 tunnelsend(b
, 5 + (p
- b
), t
); // send it
107 LOG(3, s
, t
, "Already an IP allocated: %s (%d)\n",
108 fmtaddr(htonl(session
[s
].ip
), 0), session
[s
].ip_pool_index
);
112 LOG(1, s
, t
, "No RADIUS session available to authenticate session...\n");
113 sessionshutdown(s
, "No free RADIUS sessions.", 4, 0);
118 // Run PRE_AUTH plugins
119 struct param_pre_auth packet
= { &tunnel
[t
], &session
[s
], strdup(user
), strdup(pass
), PPPPAP
, 1 };
120 run_plugins(PLUGIN_PRE_AUTH
, &packet
);
121 if (!packet
.continue_auth
)
123 LOG(3, s
, t
, "A plugin rejected PRE_AUTH\n");
124 if (packet
.username
) free(packet
.username
);
125 if (packet
.password
) free(packet
.password
);
129 strncpy(session
[s
].user
, packet
.username
, sizeof(session
[s
].user
) - 1);
130 strncpy(radius
[r
].pass
, packet
.password
, sizeof(radius
[r
].pass
) - 1);
132 free(packet
.username
);
133 free(packet
.password
);
136 LOG(3, s
, t
, "Sending login for %s/%s to RADIUS\n", user
, pass
);
137 radiussend(r
, RADIUSAUTH
);
141 // Process CHAP messages
142 void processchap(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
149 LOG_HEX(5, "CHAP", p
, l
);
153 LOG(1, s
, t
, "Short CHAP %u bytes\n", l
);
154 STAT(tunnel_rx_errors
);
155 sessionshutdown(s
, "Short CHAP packet.", 3, 0);
159 if ((hl
= ntohs(*(uint16_t *) (p
+ 2))) > l
)
161 LOG(1, s
, t
, "Length mismatch CHAP %u/%u\n", hl
, l
);
162 STAT(tunnel_rx_errors
);
163 sessionshutdown(s
, "CHAP length mismatch.", 3, 0);
170 LOG(1, s
, t
, "Unexpected CHAP response code %d\n", *p
);
171 STAT(tunnel_rx_errors
);
172 sessionshutdown(s
, "CHAP length mismatch.", 3, 0);
176 r
= sess_local
[s
].radius
;
179 LOG(3, s
, t
, "Unexpected CHAP message\n");
183 if (session
[s
].ppp
.phase
!= Authenticate
)
185 LOG(2, s
, t
, "CHAP ignored in %s phase\n", ppp_phase(session
[s
].ppp
.phase
));
189 if (p
[1] != radius
[r
].id
)
191 LOG(1, s
, t
, "Wrong CHAP response ID %d (should be %d) (%d)\n", p
[1], radius
[r
].id
, r
);
192 STAT(tunnel_rx_errors
);
193 sessionshutdown(s
, "Unexpected CHAP response ID.", 3, 0);
197 if (l
< 5 || p
[4] != 16)
199 LOG(1, s
, t
, "Bad CHAP response length %d\n", l
< 5 ? -1 : p
[4]);
200 STAT(tunnel_rx_errors
);
201 sessionshutdown(s
, "Bad CHAP response length.", 3, 0);
207 if (l
< 16 || l
- 16 >= sizeof(session
[s
].user
))
209 LOG(1, s
, t
, "CHAP user too long %d\n", l
- 16);
210 STAT(tunnel_rx_errors
);
211 sessionshutdown(s
, "CHAP username too long.", 3, 0);
215 // Run PRE_AUTH plugins
217 struct param_pre_auth packet
= { &tunnel
[t
], &session
[s
], NULL
, NULL
, PPPCHAP
, 1 };
219 packet
.password
= calloc(17, 1);
220 memcpy(packet
.password
, p
, 16);
225 packet
.username
= calloc(l
+ 1, 1);
226 memcpy(packet
.username
, p
, l
);
228 run_plugins(PLUGIN_PRE_AUTH
, &packet
);
229 if (!packet
.continue_auth
)
231 LOG(3, s
, t
, "A plugin rejected PRE_AUTH\n");
232 if (packet
.username
) free(packet
.username
);
233 if (packet
.password
) free(packet
.password
);
237 strncpy(session
[s
].user
, packet
.username
, sizeof(session
[s
].user
) - 1);
238 memcpy(radius
[r
].pass
, packet
.password
, 16);
240 free(packet
.username
);
241 free(packet
.password
);
245 LOG(3, s
, t
, "CHAP login %s\n", session
[s
].user
);
246 radiussend(r
, RADIUSAUTH
);
249 static void dumplcp(uint8_t *p
, int l
)
252 uint8_t *o
= (p
+ 4);
254 LOG_HEX(5, "PPP LCP Packet", p
, l
);
255 LOG(4, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p
, ppp_code((int)*p
), ntohs( ((uint16_t *) p
)[1]) );
256 LOG(4, 0, 0, "Length: %d\n", l
);
257 if (*p
!= ConfigReq
&& *p
!= ConfigRej
&& *p
!= ConfigAck
)
266 LOG(4, 0, 0, " Option length is %d...\n", length
);
271 LOG(4, 0, 0, " Option type is 0...\n");
278 case 1: // Maximum-Receive-Unit
280 LOG(4, 0, 0, " %s %d\n", ppp_lcp_option(type
), ntohs(*(uint16_t *)(o
+ 2)));
282 LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type
), length
);
284 case 2: // Async-Control-Character-Map
287 uint32_t asyncmap
= ntohl(*(uint32_t *)(o
+ 2));
288 LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type
), asyncmap
);
291 LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type
), length
);
293 case 3: // Authentication-Protocol
296 int proto
= ntohs(*(uint16_t *)(o
+ 2));
297 LOG(4, 0, 0, " %s 0x%x (%s)\n", ppp_lcp_option(type
), proto
,
298 proto
== PPPPAP
? "PAP" : "UNSUPPORTED");
300 else if (length
== 5)
302 int proto
= ntohs(*(uint16_t *)(o
+ 2));
304 LOG(4, 0, 0, " %s 0x%x 0x%x (%s)\n", ppp_lcp_option(type
), proto
, algo
,
305 (proto
== PPPCHAP
&& algo
== 5) ? "CHAP MD5" : "UNSUPPORTED");
308 LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type
), length
);
310 case 4: // Quality-Protocol
312 uint32_t qp
= ntohl(*(uint32_t *)(o
+ 2));
313 LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type
), qp
);
316 case 5: // Magic-Number
319 uint32_t magicno
= ntohl(*(uint32_t *)(o
+ 2));
320 LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type
), magicno
);
323 LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type
), length
);
325 case 7: // Protocol-Field-Compression
326 case 8: // Address-And-Control-Field-Compression
327 LOG(4, 0, 0, " %s\n", ppp_lcp_option(type
));
330 LOG(2, 0, 0, " Unknown PPP LCP Option type %d\n", type
);
338 void lcp_open(sessionidt s
, tunnelidt t
)
340 // transition to Authentication or Network phase:
341 session
[s
].ppp
.phase
= sess_local
[s
].lcp_authtype
? Authenticate
: Network
;
343 LOG(3, s
, t
, "LCP: Opened, phase %s\n", ppp_phase(session
[s
].ppp
.phase
));
346 change_state(s
, lcp
, Opened
);
348 if (session
[s
].ppp
.phase
== Authenticate
)
350 if (sess_local
[s
].lcp_authtype
== AUTHCHAP
)
357 change_state(s
, ipcp
, RequestSent
);
358 // move to passive state for IPv6 (if configured), CCP
359 if (config
->ipv6_prefix
.s6_addr
[0])
360 change_state(s
, ipv6cp
, Stopped
);
362 change_state(s
, ipv6cp
, Closed
);
364 change_state(s
, ccp
, Stopped
);
368 static void lcp_restart(sessionidt s
)
370 session
[s
].ppp
.phase
= Establish
;
372 change_state(s
, ipcp
, Dead
);
373 change_state(s
, ipv6cp
, Dead
);
374 change_state(s
, ccp
, Dead
);
377 static uint8_t *ppp_conf_rej(sessionidt s
, uint8_t *buf
, size_t blen
, uint16_t mtype
,
378 uint8_t **response
, uint8_t *queued
, uint8_t *packet
, uint8_t *option
)
380 if (!*response
|| **response
!= ConfigRej
)
382 queued
= *response
= makeppp(buf
, blen
, packet
, 2, s
, session
[s
].tunnel
, mtype
);
390 if ((queued
- buf
+ option
[1]) > blen
)
392 LOG(2, s
, session
[s
].tunnel
, "PPP overflow for ConfigRej (proto %u, option %u).\n", mtype
, *option
);
396 memcpy(queued
, option
, option
[1]);
397 return queued
+ option
[1];
400 static uint8_t *ppp_conf_nak(sessionidt s
, uint8_t *buf
, size_t blen
, uint16_t mtype
,
401 uint8_t **response
, uint8_t *queued
, uint8_t *packet
, uint8_t *option
,
402 uint8_t *value
, size_t vlen
)
407 case PPPLCP
: nak_sent
= &sess_local
[s
].lcp
.nak_sent
; break;
408 case PPPIPCP
: nak_sent
= &sess_local
[s
].ipcp
.nak_sent
; break;
409 case PPPIPV6CP
: nak_sent
= &sess_local
[s
].ipv6cp
.nak_sent
; break;
410 default: return 0; // ?
413 if (*response
&& **response
!= ConfigNak
)
415 if (*nak_sent
< config
->ppp_max_failure
) // reject queued
418 return ppp_conf_rej(s
, buf
, blen
, mtype
, response
, 0, packet
, option
);
423 if (*nak_sent
>= config
->ppp_max_failure
)
424 return ppp_conf_rej(s
, buf
, blen
, mtype
, response
, 0, packet
, option
);
426 queued
= *response
= makeppp(buf
, blen
, packet
, 2, s
, session
[s
].tunnel
, mtype
);
435 if ((queued
- buf
+ vlen
+ 2) > blen
)
437 LOG(2, s
, session
[s
].tunnel
, "PPP overflow for ConfigNak (proto %u, option %u).\n", mtype
, *option
);
442 *queued
++ = vlen
+ 2;
443 memcpy(queued
, value
, vlen
);
444 return queued
+ vlen
;
447 static void ppp_code_rej(sessionidt s
, tunnelidt t
, uint16_t proto
,
448 char *pname
, uint8_t *p
, uint16_t l
, uint8_t *buf
, size_t size
)
451 int mru
= session
[s
].mru
;
452 if (mru
> size
) mru
= size
;
455 if (l
> mru
) l
= mru
;
457 q
= makeppp(buf
, size
, 0, 0, s
, t
, proto
);
461 *(q
+ 1) = ++sess_local
[s
].lcp_ident
;
462 *(uint16_t *)(q
+ 2) = htons(l
);
463 memcpy(q
+ 4, p
, l
- 4);
465 LOG(2, s
, t
, "Unexpected %s code %s\n", pname
, ppp_code(*p
));
466 LOG(3, s
, t
, "%s: send %s\n", pname
, ppp_code(*q
));
467 if (config
->debug
> 3) dumplcp(q
, l
);
469 tunnelsend(buf
, l
+ (q
- buf
), t
);
472 // Process LCP messages
473 void processlcp(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
477 uint32_t magicno
= 0;
482 LOG_HEX(5, "LCP", p
, l
);
485 LOG(1, s
, t
, "Short LCP %d bytes\n", l
);
486 STAT(tunnel_rx_errors
);
490 if ((hl
= ntohs(*(uint16_t *) (p
+ 2))) > l
)
492 LOG(1, s
, t
, "Length mismatch LCP %u/%u\n", hl
, l
);
493 STAT(tunnel_rx_errors
);
498 if (session
[s
].die
) // going down...
501 LOG(*p
== EchoReq
? 4 : 3, s
, t
, "LCP: recv %s\n", ppp_code(*p
));
502 if (config
->debug
> 3) dumplcp(p
, l
);
507 uint8_t *o
= (p
+ 4);
515 if (length
== 0 || type
== 0 || x
< length
) break;
518 case 3: // Authentication-Protocol
520 int proto
= ntohs(*(uint16_t *)(o
+ 2));
523 else if (proto
== PPPCHAP
&& *(o
+ 4) == 5)
533 if (!session
[s
].ip
&& authtype
)
534 sess_local
[s
].lcp_authtype
= authtype
;
536 switch (session
[s
].ppp
.lcp
)
539 initialise_restart_count(s
, lcp
);
540 change_state(s
, lcp
, AckReceived
);
545 LOG(2, s
, t
, "LCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session
[s
].ppp
.lcp
));
546 if (session
[s
].ppp
.lcp
== Opened
)
550 change_state(s
, lcp
, RequestSent
);
558 LOG(2, s
, t
, "LCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.lcp
));
561 else if (*p
== ConfigReq
)
564 uint8_t *o
= (p
+ 4);
565 uint8_t *response
= 0;
566 static uint8_t asyncmap
[4] = { 0, 0, 0, 0 }; // all zero
567 static uint8_t authproto
[5];
574 if (length
== 0 || type
== 0 || x
< length
) break;
577 case 1: // Maximum-Receive-Unit
579 uint16_t mru
= ntohs(*(uint16_t *)(o
+ 2));
582 session
[s
].mru
= mru
;
586 LOG(3, s
, t
, " Remote requesting MRU of %u. Rejecting.\n", mru
);
588 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPLCP
, &response
, q
, p
, o
, (uint8_t *) &mru
, sizeof(mru
));
592 case 2: // Async-Control-Character-Map
593 if (!ntohl(*(uint32_t *)(o
+ 2))) // all bits zero is OK
596 LOG(3, s
, t
, " Remote requesting asyncmap. Rejecting.\n");
597 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPLCP
, &response
, q
, p
, o
, asyncmap
, sizeof(asyncmap
));
600 case 3: // Authentication-Protocol
602 int proto
= ntohs(*(uint16_t *)(o
+ 2));
603 char proto_name
[] = "0x0000";
608 if (config
->radius_authtypes
& AUTHPAP
)
610 sess_local
[s
].lcp_authtype
= AUTHPAP
;
614 strcpy(proto_name
, "PAP");
616 else if (proto
== PPPCHAP
)
618 if (config
->radius_authtypes
& AUTHCHAP
619 && *(o
+ 4) == 5) // MD5
621 sess_local
[s
].lcp_authtype
= AUTHCHAP
;
625 strcpy(proto_name
, "CHAP");
628 sprintf(proto_name
, "%#4.4x", proto
);
630 LOG(3, s
, t
, " Remote requesting %s authentication. Rejecting.\n", proto_name
);
632 alen
= add_lcp_auth(authproto
, sizeof(authproto
), config
->radius_authprefer
);
633 if (alen
< 2) break; // paranoia
635 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPLCP
, &response
, q
, p
, o
, authproto
+ 2, alen
- 2);
636 if (q
&& *response
== ConfigNak
&&
637 config
->radius_authtypes
!= config
->radius_authprefer
)
640 alen
= add_lcp_auth(authproto
, sizeof(authproto
), config
->radius_authtypes
& ~config
->radius_authprefer
);
642 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPLCP
, &response
, q
, p
, o
, authproto
+ 2, alen
- 2);
649 case 5: // Magic-Number
650 magicno
= ntohl(*(uint32_t *)(o
+ 2));
653 case 4: // Quality-Protocol
654 case 7: // Protocol-Field-Compression
655 case 8: // Address-And-Control-Field-Compression
658 default: // Reject any unknown options
659 LOG(3, s
, t
, " Rejecting unknown PPP LCP option %d\n", type
);
660 q
= ppp_conf_rej(s
, b
, sizeof(b
), PPPLCP
, &response
, q
, p
, o
);
668 l
= q
- response
; // LCP packet length
669 *((uint16_t *) (response
+ 2)) = htons(l
); // update header
673 // Send packet back as ConfigAck
674 response
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPLCP
);
675 if (!response
) return;
676 *response
= ConfigAck
;
679 switch (session
[s
].ppp
.lcp
)
682 response
= makeppp(b
, sizeof(b
), p
, 2, s
, t
, PPPLCP
);
683 if (!response
) return;
684 *response
= TerminateAck
;
685 *((uint16_t *) (response
+ 2)) = htons(l
= 4);
689 initialise_restart_count(s
, lcp
);
691 if (*response
== ConfigAck
)
692 change_state(s
, lcp
, AckSent
);
694 change_state(s
, lcp
, RequestSent
);
699 if (*response
== ConfigAck
)
700 change_state(s
, lcp
, AckSent
);
705 if (*response
== ConfigAck
)
716 if (*response
== ConfigAck
)
717 change_state(s
, lcp
, AckSent
);
719 change_state(s
, lcp
, RequestSent
);
724 LOG(2, s
, t
, "LCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.lcp
));
728 LOG(3, s
, t
, "LCP: send %s\n", ppp_code(*response
));
729 if (config
->debug
> 3) dumplcp(response
, l
);
731 tunnelsend(b
, l
+ (response
- b
), t
);
733 else if (*p
== ConfigNak
|| *p
== ConfigRej
)
736 uint8_t *o
= (p
+ 4);
744 if (length
== 0 || type
== 0 || x
< length
) break;
747 case 1: // Maximum-Receive-Unit
750 sess_local
[s
].ppp_mru
= ntohs(*(uint16_t *)(o
+ 2));
751 LOG(3, s
, t
, " Remote requested MRU of %u\n", sess_local
[s
].ppp_mru
);
755 sess_local
[s
].ppp_mru
= 0;
756 LOG(3, s
, t
, " Remote rejected MRU negotiation\n");
761 case 3: // Authentication-Protocol
767 int proto
= ntohs(*(uint16_t *)(o
+ 2));
770 authtype
= config
->radius_authtypes
& AUTHPAP
;
771 LOG(3, s
, t
, " Remote requested PAP authentication...%sing\n",
772 authtype
? "accept" : "reject");
774 else if (proto
== PPPCHAP
&& *(o
+ 4) == 5)
776 authtype
= config
->radius_authtypes
& AUTHCHAP
;
777 LOG(3, s
, t
, " Remote requested CHAP authentication...%sing\n",
778 authtype
? "accept" : "reject");
782 LOG(3, s
, t
, " Rejecting unsupported authentication %#4x\n",
788 LOG(2, s
, t
, "LCP: remote rejected auth negotiation\n");
789 authtype
= 0; // shutdown
795 LOG(2, s
, t
, "LCP: remote sent %s for type %u?\n", ppp_code(*p
), type
);
804 sessionshutdown(s
, "Unsupported authentication.", 3, 0);
809 sess_local
[s
].lcp_authtype
= authtype
;
811 switch (session
[s
].ppp
.lcp
)
816 uint8_t *response
= makeppp(b
, sizeof(b
), p
, 2, s
, t
, PPPLCP
);
817 if (!response
) return;
818 *response
= TerminateAck
;
819 *((uint16_t *) (response
+ 2)) = htons(l
= 4);
821 LOG(3, s
, t
, "LCP: send %s\n", ppp_code(*response
));
822 if (config
->debug
> 3) dumplcp(response
, l
);
824 tunnelsend(b
, l
+ (response
- b
), t
);
830 initialise_restart_count(s
, lcp
);
835 LOG(2, s
, t
, "LCP: ConfigNak in state %s? Sending ConfigReq\n", ppp_state(session
[s
].ppp
.lcp
));
845 LOG(2, s
, t
, "LCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.lcp
));
849 else if (*p
== TerminateReq
)
851 *p
= TerminateAck
; // close
852 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPLCP
);
855 LOG(3, s
, t
, "LCP: send %s\n", ppp_code(*q
));
856 if (config
->debug
> 3) dumplcp(q
, l
);
858 tunnelsend(b
, l
+ (q
- b
), t
); // send it
859 sessionshutdown(s
, "Remote end closed connection.", 3, 0);
861 else if (*p
== TerminateAck
)
863 sessionshutdown(s
, "Connection closed.", 3, 0);
865 else if (*p
== ProtocolRej
)
872 if (l
> 5 && !(proto
& 1))
879 if (proto
== PPPIPV6CP
)
881 LOG(3, s
, t
, "IPv6 rejected\n");
882 change_state(s
, ipv6cp
, Closed
);
886 LOG(3, s
, t
, "LCP protocol reject: 0x%04X\n", proto
);
889 else if (*p
== EchoReq
)
891 *p
= EchoReply
; // reply
892 *(uint32_t *) (p
+ 4) = htonl(session
[s
].magic
); // our magic number
893 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPLCP
);
896 LOG(4, s
, t
, "LCP: send %s\n", ppp_code(*q
));
897 if (config
->debug
> 3) dumplcp(q
, l
);
899 tunnelsend(b
, l
+ (q
- b
), t
); // send it
901 else if (*p
== EchoReply
)
903 // Ignore it, last_packet time is set earlier than this.
905 else if (*p
!= CodeRej
)
907 ppp_code_rej(s
, t
, PPPLCP
, "LCP", p
, l
, b
, sizeof(b
));
911 static void ipcp_open(sessionidt s
, tunnelidt t
)
913 LOG(3, s
, t
, "IPCP: Opened, session is now active\n");
915 change_state(s
, ipcp
, Opened
);
917 if (!(session
[s
].walled_garden
|| session
[s
].flags
& SESSION_STARTED
))
919 uint16_t r
= radiusnew(s
);
922 radiussend(r
, RADIUSSTART
); // send radius start
924 // don't send further Start records if IPCP is restarted
925 session
[s
].flags
|= SESSION_STARTED
;
926 cluster_send_session(s
);
930 // start IPv6 if configured and still in passive state
931 if (session
[s
].ppp
.ipv6cp
== Stopped
)
934 change_state(s
, ipv6cp
, RequestSent
);
938 // Process IPCP messages
939 void processipcp(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
947 LOG_HEX(5, "IPCP", p
, l
);
950 LOG(1, s
, t
, "Short IPCP %d bytes\n", l
);
951 STAT(tunnel_rx_errors
);
955 if ((hl
= ntohs(*(uint16_t *) (p
+ 2))) > l
)
957 LOG(1, s
, t
, "Length mismatch IPCP %u/%u\n", hl
, l
);
958 STAT(tunnel_rx_errors
);
963 if (session
[s
].ppp
.phase
< Network
)
965 LOG(2, s
, t
, "IPCP %s ignored in %s phase\n", ppp_code(*p
), ppp_phase(session
[s
].ppp
.phase
));
969 LOG(3, s
, t
, "IPCP: recv %s\n", ppp_code(*p
));
973 switch (session
[s
].ppp
.ipcp
)
976 initialise_restart_count(s
, ipcp
);
977 change_state(s
, ipcp
, AckReceived
);
982 LOG(2, s
, t
, "IPCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session
[s
].ppp
.ipcp
));
984 change_state(s
, ipcp
, RequestSent
);
992 LOG(2, s
, t
, "IPCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ipcp
));
995 else if (*p
== ConfigReq
)
997 uint8_t *response
= 0;
1007 case 3: // ip address
1008 gotip
++; // seen address
1009 if (o
[1] != 6 || o
[1] > length
) return;
1011 addr
= htonl(session
[s
].ip
);
1012 if (memcmp(o
+ 2, &addr
, (sizeof addr
)))
1015 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPIPCP
, &response
, q
, p
, o
, (uint8_t *) &addr
, sizeof(addr
));
1016 if (!q
|| (q
!= oq
&& *response
== ConfigRej
))
1018 sessionshutdown(s
, "Can't negotiate IPCP.", 3, 0);
1025 case 129: // primary DNS
1026 if (o
[1] != 6 || o
[1] > length
) return;
1028 addr
= htonl(session
[s
].dns1
);
1029 if (memcmp(o
+ 2, &addr
, (sizeof addr
)))
1031 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPIPCP
, &response
, q
, p
, o
, (uint8_t *) &addr
, sizeof(addr
));
1037 case 131: // secondary DNS
1038 if (o
[1] != 6 || o
[1] > length
) return;
1040 addr
= htonl(session
[s
].dns2
);
1041 if (memcmp(o
+ 2, &addr
, sizeof(addr
)))
1043 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPIPCP
, &response
, q
, p
, o
, (uint8_t *) &addr
, sizeof(addr
));
1050 LOG(2, s
, t
, " Rejecting PPP IPCP Option type %d\n", *o
);
1051 q
= ppp_conf_rej(s
, b
, sizeof(b
), PPPIPCP
, &response
, q
, p
, o
);
1061 l
= q
- response
; // IPCP packet length
1062 *((uint16_t *) (response
+ 2)) = htons(l
); // update header
1066 // Send packet back as ConfigAck
1067 response
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPIPCP
);
1068 if (!response
) return;
1069 *response
= ConfigAck
;
1073 LOG(1, s
, t
, "No IP in IPCP request\n");
1074 STAT(tunnel_rx_errors
);
1078 switch (session
[s
].ppp
.ipcp
)
1081 response
= makeppp(b
, sizeof(b
), p
, 2, s
, t
, PPPIPCP
);
1082 if (!response
) return;
1083 *response
= TerminateAck
;
1084 *((uint16_t *) (response
+ 2)) = htons(l
= 4);
1088 initialise_restart_count(s
, ipcp
);
1090 if (*response
== ConfigAck
)
1091 change_state(s
, ipcp
, AckSent
);
1093 change_state(s
, ipcp
, RequestSent
);
1098 if (*response
== ConfigAck
)
1099 change_state(s
, ipcp
, AckSent
);
1104 if (*response
== ConfigAck
)
1110 initialise_restart_count(s
, ipcp
);
1115 if (*response
== ConfigAck
)
1116 change_state(s
, ipcp
, AckSent
);
1118 change_state(s
, ipcp
, RequestSent
);
1123 LOG(2, s
, t
, "IPCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ipcp
));
1127 LOG(3, s
, t
, "IPCP: send %s\n", ppp_code(*response
));
1128 tunnelsend(b
, l
+ (response
- b
), t
);
1130 else if (*p
== TerminateReq
)
1133 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPIPCP
);
1135 LOG(3, s
, t
, "IPCP: send %s\n", ppp_code(*q
));
1136 tunnelsend(b
, l
+ (q
- b
), t
);
1137 change_state(s
, ipcp
, Stopped
);
1139 else if (*p
!= CodeRej
)
1141 ppp_code_rej(s
, t
, PPPIPCP
, "IPCP", p
, l
, b
, sizeof(b
));
1145 static void ipv6cp_open(sessionidt s
, tunnelidt t
)
1147 LOG(3, s
, t
, "IPV6CP: Opened\n");
1149 change_state(s
, ipv6cp
, Opened
);
1150 if (session
[s
].ipv6prefixlen
)
1151 route6set(s
, session
[s
].ipv6route
, session
[s
].ipv6prefixlen
, 1);
1153 // Send an initial RA (TODO: Should we send these regularly?)
1154 send_ipv6_ra(s
, t
, NULL
);
1157 // Process IPV6CP messages
1158 void processipv6cp(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
1160 uint8_t b
[MAXETHER
];
1164 CSTAT(processipv6cp
);
1166 LOG_HEX(5, "IPV6CP", p
, l
);
1169 LOG(1, s
, t
, "Short IPV6CP %d bytes\n", l
);
1170 STAT(tunnel_rx_errors
);
1174 if ((hl
= ntohs(*(uint16_t *) (p
+ 2))) > l
)
1176 LOG(1, s
, t
, "Length mismatch IPV6CP %u/%u\n", hl
, l
);
1177 STAT(tunnel_rx_errors
);
1182 if (session
[s
].ppp
.phase
< Network
)
1184 LOG(2, s
, t
, "IPV6CP %s ignored in %s phase\n", ppp_code(*p
), ppp_phase(session
[s
].ppp
.phase
));
1188 LOG(3, s
, t
, "IPV6CP: recv %s\n", ppp_code(*p
));
1192 LOG(3, s
, t
, "IPV6CP: no IPv4 address (IPCP in state %s)\n", ppp_state(session
[s
].ppp
.ipcp
));
1193 return; // need IPCP to complete...
1196 if (*p
== ConfigAck
)
1198 switch (session
[s
].ppp
.ipv6cp
)
1201 initialise_restart_count(s
, ipv6cp
);
1202 change_state(s
, ipv6cp
, AckReceived
);
1207 LOG(2, s
, t
, "IPV6CP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session
[s
].ppp
.ipv6cp
));
1209 change_state(s
, ipv6cp
, RequestSent
);
1217 LOG(2, s
, t
, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ipv6cp
));
1220 else if (*p
== ConfigReq
)
1222 uint8_t *response
= 0;
1232 case 1: // interface identifier
1233 gotip
++; // seen address
1234 if (o
[1] != 10 || o
[1] > length
) return;
1236 *(uint32_t *) ident
= htonl(session
[s
].ip
);
1237 *(uint32_t *) (ident
+ 4) = 0;
1239 if (memcmp(o
+ 2, ident
, sizeof(ident
)))
1241 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPIPV6CP
, &response
, q
, p
, o
, ident
, sizeof(ident
));
1248 LOG(2, s
, t
, " Rejecting PPP IPV6CP Option type %d\n", *o
);
1249 q
= ppp_conf_rej(s
, b
, sizeof(b
), PPPIPV6CP
, &response
, q
, p
, o
);
1259 l
= q
- response
; // IPV6CP packet length
1260 *((uint16_t *) (response
+ 2)) = htons(l
); // update header
1264 // Send packet back as ConfigAck
1265 response
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPIPV6CP
);
1266 if (!response
) return;
1267 *response
= ConfigAck
;
1271 LOG(1, s
, t
, "No interface identifier in IPV6CP request\n");
1272 STAT(tunnel_rx_errors
);
1276 switch (session
[s
].ppp
.ipv6cp
)
1279 response
= makeppp(b
, sizeof(b
), p
, 2, s
, t
, PPPIPV6CP
);
1280 if (!response
) return;
1281 *response
= TerminateAck
;
1282 *((uint16_t *) (response
+ 2)) = htons(l
= 4);
1286 initialise_restart_count(s
, ipv6cp
);
1288 if (*response
== ConfigAck
)
1289 change_state(s
, ipv6cp
, AckSent
);
1291 change_state(s
, ipv6cp
, RequestSent
);
1296 if (*response
== ConfigAck
)
1297 change_state(s
, ipv6cp
, AckSent
);
1302 if (*response
== ConfigAck
)
1308 initialise_restart_count(s
, ipv6cp
);
1313 if (*response
== ConfigAck
)
1314 change_state(s
, ipv6cp
, AckSent
);
1316 change_state(s
, ipv6cp
, RequestSent
);
1321 LOG(2, s
, t
, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ipv6cp
));
1325 LOG(3, s
, t
, "IPV6CP: send %s\n", ppp_code(*response
));
1326 tunnelsend(b
, l
+ (response
- b
), t
);
1328 else if (*p
== TerminateReq
)
1331 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPIPV6CP
);
1333 LOG(3, s
, t
, "IPV6CP: send %s\n", ppp_code(*q
));
1334 tunnelsend(b
, l
+ (q
- b
), t
);
1335 change_state(s
, ipv6cp
, Stopped
);
1337 else if (*p
!= CodeRej
)
1339 ppp_code_rej(s
, t
, PPPIPV6CP
, "IPV6CP", p
, l
, b
, sizeof(b
));
1343 // process IP packet received
1345 // This MUST be called with at least 4 byte behind 'p'.
1346 // (i.e. this routine writes to p[-4]).
1347 void processipin(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
1353 LOG_HEX(5, "IP", p
, l
);
1357 LOG(1, s
, t
, "IP packet too short %d\n", l
);
1358 STAT(tunnel_rx_errors
);
1362 ip
= ntohl(*(uint32_t *)(p
+ 12));
1366 LOG(1, s
, t
, "IP packet too long %d\n", l
);
1367 STAT(tunnel_rx_errors
);
1371 if (session
[s
].ppp
.phase
!= Network
|| session
[s
].ppp
.ipcp
!= Opened
)
1374 // no spoof (do sessionbyip to handled statically routed subnets)
1375 if (ip
!= session
[s
].ip
&& sessionbyip(htonl(ip
)) != s
)
1377 LOG(5, s
, t
, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip
), 0));
1381 // run access-list if any
1382 if (session
[s
].filter_in
&& !ip_filter(p
, l
, session
[s
].filter_in
- 1))
1385 // adjust MSS on SYN and SYN,ACK packets with options
1386 if ((ntohs(*(uint16_t *) (p
+ 6)) & 0x1fff) == 0 && p
[9] == IPPROTO_TCP
) // first tcp fragment
1388 int ihl
= (p
[0] & 0xf) * 4; // length of IP header
1389 if (l
>= ihl
+ 20 && (p
[ihl
+ 13] & TCP_FLAG_SYN
) && ((p
[ihl
+ 12] >> 4) > 5))
1390 adjust_tcp_mss(s
, t
, p
, l
, p
+ ihl
);
1393 // Add on the tun header
1395 *(uint32_t *) p
= htonl(PKTIP
);
1398 // Are we throttled and a slave?
1399 if (session
[s
].tbf_in
&& !config
->cluster_iam_master
) {
1400 // Pass it to the master for handling.
1401 master_throttle_packet(session
[s
].tbf_in
, p
, l
);
1405 // Are we throttled and a master??
1406 if (session
[s
].tbf_in
&& config
->cluster_iam_master
) {
1407 // Actually handle the throttled packets.
1408 tbf_queue_packet(session
[s
].tbf_in
, p
, l
);
1413 if (tun_write(p
, l
) < 0)
1415 STAT(tun_tx_errors
);
1416 LOG(0, s
, t
, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
1417 l
, strerror(errno
), tunfd
, p
);
1425 if (session
[s
].snoop_ip
&& session
[s
].snoop_port
)
1427 // Snooping this session
1428 snoop_send_packet(p
, l
, session
[s
].snoop_ip
, session
[s
].snoop_port
);
1431 increment_counter(&session
[s
].cin
, &session
[s
].cin_wrap
, l
);
1432 session
[s
].cin_delta
+= l
;
1435 sess_local
[s
].cin
+= l
;
1436 sess_local
[s
].pin
++;
1440 STAT(tun_tx_packets
);
1441 INC_STAT(tun_tx_bytes
, l
);
1444 // process IPv6 packet received
1446 // This MUST be called with at least 4 byte behind 'p'.
1447 // (i.e. this routine writes to p[-4]).
1448 void processipv6in(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
1453 CSTAT(processipv6in
);
1455 LOG_HEX(5, "IPv6", p
, l
);
1457 ip
= *(struct in6_addr
*) (p
+ 8);
1458 ipv4
= ntohl(*(uint32_t *)(p
+ 16));
1462 LOG(1, s
, t
, "IP packet too long %d\n", l
);
1463 STAT(tunnel_rx_errors
);
1467 if (session
[s
].ppp
.phase
!= Network
|| session
[s
].ppp
.ipv6cp
!= Opened
)
1471 if (ipv4
!= session
[s
].ip
&& memcmp(&config
->ipv6_prefix
, &ip
, 8) && sessionbyipv6(ip
) != s
)
1473 char str
[INET6_ADDRSTRLEN
];
1474 LOG(5, s
, t
, "Dropping packet with spoofed IP %s\n",
1475 inet_ntop(AF_INET6
, &ip
, str
, INET6_ADDRSTRLEN
));
1479 // Check if it's a Router Solicition message.
1480 if (*(p
+ 6) == 58 && *(p
+ 7) == 255 && *(p
+ 24) == 0xFF && *(p
+ 25) == 2 &&
1481 *(uint32_t *)(p
+ 26) == 0 && *(uint32_t *)(p
+ 30) == 0 &&
1482 *(uint32_t *)(p
+ 34) == 0 &&
1483 *(p
+ 38) == 0 && *(p
+ 39) == 2 && *(p
+ 40) == 133) {
1484 LOG(3, s
, t
, "Got IPv6 RS\n");
1485 send_ipv6_ra(s
, t
, &ip
);
1489 // Add on the tun header
1491 *(uint32_t *) p
= htonl(PKTIPV6
);
1494 // Are we throttled and a slave?
1495 if (session
[s
].tbf_in
&& !config
->cluster_iam_master
) {
1496 // Pass it to the master for handling.
1497 master_throttle_packet(session
[s
].tbf_in
, p
, l
);
1501 // Are we throttled and a master??
1502 if (session
[s
].tbf_in
&& config
->cluster_iam_master
) {
1503 // Actually handle the throttled packets.
1504 tbf_queue_packet(session
[s
].tbf_in
, p
, l
);
1509 if (tun_write(p
, l
) < 0)
1511 STAT(tun_tx_errors
);
1512 LOG(0, s
, t
, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
1513 l
, strerror(errno
), tunfd
, p
);
1521 if (session
[s
].snoop_ip
&& session
[s
].snoop_port
)
1523 // Snooping this session
1524 snoop_send_packet(p
, l
, session
[s
].snoop_ip
, session
[s
].snoop_port
);
1527 increment_counter(&session
[s
].cin
, &session
[s
].cin_wrap
, l
);
1528 session
[s
].cin_delta
+= l
;
1531 sess_local
[s
].cin
+= l
;
1532 sess_local
[s
].pin
++;
1536 STAT(tun_tx_packets
);
1537 INC_STAT(tun_tx_bytes
, l
);
1541 // Helper routine for the TBF filters.
1542 // Used to send queued data in from the user.
1544 void send_ipin(sessionidt s
, uint8_t *buf
, int len
)
1546 LOG_HEX(5, "IP in throttled", buf
, len
);
1548 if (write(tunfd
, buf
, len
) < 0)
1550 STAT(tun_tx_errors
);
1551 LOG(0, 0, 0, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
1552 len
, strerror(errno
), tunfd
, buf
);
1560 if (session
[s
].snoop_ip
&& session
[s
].snoop_port
)
1562 // Snooping this session
1563 snoop_send_packet(buf
, len
, session
[s
].snoop_ip
, session
[s
].snoop_port
);
1566 // Increment packet counters
1567 increment_counter(&session
[s
].cin
, &session
[s
].cin_wrap
, len
);
1568 session
[s
].cin_delta
+= len
;
1571 sess_local
[s
].cin
+= len
;
1572 sess_local
[s
].pin
++;
1576 STAT(tun_tx_packets
);
1577 INC_STAT(tun_tx_bytes
, len
- 4);
1581 // Process CCP messages
1582 void processccp(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
1584 uint8_t b
[MAXETHER
];
1589 LOG_HEX(5, "CCP", p
, l
);
1591 if (session
[s
].ppp
.phase
< Network
)
1593 LOG(2, s
, t
, "CCP %s ignored in %s phase\n", ppp_code(*p
), ppp_phase(session
[s
].ppp
.phase
));
1599 LOG(1, s
, t
, "Short CCP packet\n");
1600 STAT(tunnel_rx_errors
);
1603 LOG(3, s
, t
, "CCP: recv %s\n", ppp_code(*p
));
1604 if (*p
== ConfigAck
)
1606 switch (session
[s
].ppp
.ccp
)
1609 initialise_restart_count(s
, ccp
);
1610 change_state(s
, ccp
, AckReceived
);
1615 LOG(2, s
, t
, "CCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session
[s
].ppp
.ccp
));
1617 change_state(s
, ccp
, RequestSent
);
1621 LOG(3, s
, t
, "CCP: Opened\n");
1622 change_state(s
, ccp
, Opened
);
1626 LOG(2, s
, t
, "CCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ccp
));
1629 else if (*p
== ConfigReq
)
1631 if (l
< 6) // accept no compression
1633 else // compression requested--reject
1636 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPCCP
);
1639 switch (session
[s
].ppp
.ccp
)
1642 q
= makeppp(b
, sizeof(b
), p
, 2, s
, t
, PPPCCP
);
1645 *((uint16_t *) (q
+ 2)) = htons(l
= 4);
1649 initialise_restart_count(s
, ccp
);
1651 if (*q
== ConfigAck
)
1652 change_state(s
, ccp
, AckSent
);
1654 change_state(s
, ccp
, RequestSent
);
1659 if (*q
== ConfigAck
)
1660 change_state(s
, ccp
, AckSent
);
1665 if (*q
== ConfigAck
)
1666 change_state(s
, ccp
, Opened
);
1671 initialise_restart_count(s
, ccp
);
1676 if (*q
== ConfigAck
)
1677 change_state(s
, ccp
, AckSent
);
1679 change_state(s
, ccp
, RequestSent
);
1684 LOG(2, s
, t
, "CCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ccp
));
1688 LOG(3, s
, t
, "CCP: send %s\n", ppp_code(*q
));
1689 tunnelsend(b
, l
+ (q
- b
), t
);
1691 else if (*p
== TerminateReq
)
1694 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPCCP
);
1696 LOG(3, s
, t
, "CCP: send %s\n", ppp_code(*q
));
1697 tunnelsend(b
, l
+ (q
- b
), t
);
1698 change_state(s
, ccp
, Stopped
);
1700 else if (*p
!= CodeRej
)
1702 ppp_code_rej(s
, t
, PPPCCP
, "CCP", p
, l
, b
, sizeof(b
));
1706 // send a CHAP challenge
1707 void sendchap(sessionidt s
, tunnelidt t
)
1709 uint8_t b
[MAXETHER
];
1718 LOG(1, s
, t
, "No RADIUS to send challenge\n");
1719 STAT(tunnel_tx_errors
);
1723 LOG(1, s
, t
, "Send CHAP challenge\n");
1725 radius
[r
].chap
= 1; // CHAP not PAP
1727 if (radius
[r
].state
!= RADIUSCHAP
)
1730 radius
[r
].state
= RADIUSCHAP
;
1731 radius
[r
].retry
= backoff(radius
[r
].try++);
1732 if (radius
[r
].try > 5)
1734 sessionshutdown(s
, "CHAP timeout.", 3, 0);
1735 STAT(tunnel_tx_errors
);
1738 q
= makeppp(b
, sizeof(b
), 0, 0, s
, t
, PPPCHAP
);
1741 *q
= 1; // challenge
1742 q
[1] = radius
[r
].id
; // ID
1743 q
[4] = 16; // value size (size of challenge)
1744 memcpy(q
+ 5, radius
[r
].auth
, 16); // challenge
1745 strcpy((char *) q
+ 21, hostname
); // our name
1746 *(uint16_t *) (q
+ 2) = htons(strlen(hostname
) + 21); // length
1747 tunnelsend(b
, strlen(hostname
) + 21 + (q
- b
), t
); // send it
1750 // fill in a L2TP message with a PPP frame,
1751 // copies existing PPP message and changes magic number if seen
1752 // returns start of PPP frame
1753 uint8_t *makeppp(uint8_t *b
, int size
, uint8_t *p
, int l
, sessionidt s
, tunnelidt t
, uint16_t mtype
)
1755 if (size
< 12) // Need more space than this!!
1757 static int backtrace_count
= 0;
1758 LOG(0, s
, t
, "makeppp buffer too small for L2TP header (size=%d)\n", size
);
1759 log_backtrace(backtrace_count
, 5)
1763 *(uint16_t *) (b
+ 0) = htons(0x0002); // L2TP with no options
1764 *(uint16_t *) (b
+ 2) = htons(tunnel
[t
].far
); // tunnel
1765 *(uint16_t *) (b
+ 4) = htons(session
[s
].far
); // session
1767 if (mtype
== PPPLCP
|| !(session
[s
].flags
& SESSION_ACFC
))
1769 *(uint16_t *) b
= htons(0xFF03); // HDLC header
1772 if (mtype
< 0x100 && session
[s
].flags
& SESSION_PFC
)
1776 *(uint16_t *) b
= htons(mtype
);
1782 static int backtrace_count
= 0;
1783 LOG(2, s
, t
, "makeppp would overflow buffer (size=%d, header+payload=%d)\n", size
, l
+ 12);
1784 log_backtrace(backtrace_count
, 5)
1794 static int add_lcp_auth(uint8_t *b
, int size
, int authtype
)
1797 if ((authtype
== AUTHCHAP
&& size
< 5) || size
< 4)
1800 *b
++ = 3; // Authentication-Protocol
1801 if (authtype
== AUTHCHAP
)
1803 len
= *b
++ = 5; // length
1804 *(uint16_t *) b
= htons(PPPCHAP
); b
+= 2;
1807 else if (authtype
== AUTHPAP
)
1809 len
= *b
++ = 4; // length
1810 *(uint16_t *) b
= htons(PPPPAP
); b
+= 2;
1814 LOG(0, 0, 0, "add_lcp_auth called with unsupported auth type %d\n", authtype
);
1820 // Send initial LCP ConfigReq for MRU, authentication type and magic no
1821 void sendlcp(sessionidt s
, tunnelidt t
)
1823 uint8_t b
[500], *q
, *l
;
1824 int authtype
= sess_local
[s
].lcp_authtype
;
1826 if (!(q
= makeppp(b
, sizeof(b
), NULL
, 0, s
, t
, PPPLCP
)))
1829 LOG(3, s
, t
, "LCP: send ConfigReq%s%s%s\n",
1830 authtype
? " (" : "",
1831 authtype
? (authtype
== AUTHCHAP
? "CHAP" : "PAP") : "",
1832 authtype
? ")" : "");
1836 *l
++ = ++sess_local
[s
].lcp_ident
; // ID
1838 l
+= 2; //Save space for length
1840 if (sess_local
[s
].ppp_mru
)
1842 *l
++ = 1; *l
++ = 4; // Maximum-Receive-Unit (length 4)
1843 *(uint16_t *) l
= htons(sess_local
[s
].ppp_mru
); l
+= 2;
1847 l
+= add_lcp_auth(l
, sizeof(b
) - (l
- b
), authtype
);
1849 *l
++ = 5; *l
++ = 6; // Magic-Number (length 6)
1850 *(uint32_t *) l
= htonl(session
[s
].magic
);
1853 *(uint16_t *)(q
+ 2) = htons(l
- q
); // Length
1855 LOG_HEX(5, "PPPLCP", q
, l
- q
);
1856 if (config
->debug
> 3) dumplcp(q
, l
- q
);
1858 tunnelsend(b
, (l
- b
), t
);
1859 restart_timer(s
, lcp
);
1862 // Send CCP request for no compression
1863 void sendccp(sessionidt s
, tunnelidt t
)
1867 if (!(q
= makeppp(b
, sizeof(b
), NULL
, 0, s
, t
, PPPCCP
)))
1870 LOG(3, s
, t
, "CCP: send ConfigReq (no compression)\n");
1873 *(q
+ 1) = ++sess_local
[s
].lcp_ident
; // ID
1874 *(uint16_t *)(q
+ 2) = htons(4); // Length
1876 LOG_HEX(5, "PPPCCP", q
, 4);
1877 tunnelsend(b
, (q
- b
) + 4 , t
);
1878 restart_timer(s
, ccp
);