19 extern tunnelt
*tunnel
;
20 extern bundlet
*bundle
;
21 extern fragmentationt
*frag
;
22 extern sessiont
*session
;
23 extern radiust
*radius
;
25 extern char hostname
[];
26 extern uint32_t eth_tx
;
27 extern time_t time_now
;
28 extern uint64_t time_now_ms
;
29 extern configt
*config
;
31 static int add_lcp_auth(uint8_t *b
, int size
, int authtype
);
32 static bundleidt
new_bundle(void);
33 static int epdiscmp(epdist
, epdist
);
34 static void setepdis(epdist
*, epdist
);
35 static void ipcp_open(sessionidt s
, tunnelidt t
);
37 static int first_session_in_bundle(sessionidt s
)
40 for (i
= 1; i
< MAXBUNDLE
; i
++)
41 if (bundle
[i
].state
!= BUNDLEFREE
)
42 if (epdiscmp(session
[s
].epdis
,bundle
[i
].epdis
) && !strcmp(session
[s
].user
, bundle
[i
].user
))
47 // Process PAP messages
48 void processpap(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
57 LOG_HEX(5, "PAP", p
, l
);
60 LOG(1, s
, t
, "Short PAP %u bytes\n", l
);
61 STAT(tunnel_rx_errors
);
62 sessionshutdown(s
, "Short PAP packet.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
66 if ((hl
= ntohs(*(uint16_t *) (p
+ 2))) > l
)
68 LOG(1, s
, t
, "Length mismatch PAP %u/%u\n", hl
, l
);
69 STAT(tunnel_rx_errors
);
70 sessionshutdown(s
, "PAP length mismatch.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
77 LOG(1, s
, t
, "Unexpected PAP code %d\n", *p
);
78 STAT(tunnel_rx_errors
);
79 sessionshutdown(s
, "Unexpected PAP code.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
83 if (session
[s
].ppp
.phase
!= Authenticate
)
85 LOG(2, s
, t
, "PAP ignored in %s phase\n", ppp_phase(session
[s
].ppp
.phase
));
92 user
[0] = pass
[0] = 0;
93 if (*b
&& *b
< sizeof(user
))
95 memcpy(user
, b
+ 1, *b
);
98 if (*b
&& *b
< sizeof(pass
))
100 memcpy(pass
, b
+ 1, *b
);
104 LOG(3, s
, t
, "PAP login %s/%s\n", user
, pass
);
108 if ((!config
->disable_lac_func
) && lac_conf_forwardtoremotelns(s
, user
))
110 // Creating a tunnel/session has been started
115 if (session
[s
].ip
|| !(r
= radiusnew(s
)))
117 // respond now, either no RADIUS available or already authenticated
120 uint8_t *p
= makeppp(b
, sizeof(b
), 0, 0, s
, t
, PPPPAP
, 0, 0, 0);
126 *p
= 3; // cant authorise
128 *(uint16_t *) (p
+ 2) = htons(5); // length
129 p
[4] = 0; // no message
130 tunnelsend(b
, 5 + (p
- b
), t
); // send it
134 LOG(3, s
, t
, "Already an IP allocated: %s (%d)\n",
135 fmtaddr(htonl(session
[s
].ip
), 0), session
[s
].ip_pool_index
);
139 LOG(1, s
, t
, "No RADIUS session available to authenticate session...\n");
140 sessionshutdown(s
, "No free RADIUS sessions.", CDN_UNAVAILABLE
, TERM_SERVICE_UNAVAILABLE
);
145 // Run PRE_AUTH plugins
146 struct param_pre_auth packet
= { &tunnel
[t
], &session
[s
], strdup(user
), strdup(pass
), PPPPAP
, 1 };
147 run_plugins(PLUGIN_PRE_AUTH
, &packet
);
148 if (!packet
.continue_auth
)
150 LOG(3, s
, t
, "A plugin rejected PRE_AUTH\n");
151 if (packet
.username
) free(packet
.username
);
152 if (packet
.password
) free(packet
.password
);
156 strncpy(session
[s
].user
, packet
.username
, sizeof(session
[s
].user
) - 1);
157 strncpy(radius
[r
].pass
, packet
.password
, sizeof(radius
[r
].pass
) - 1);
159 free(packet
.username
);
160 free(packet
.password
);
163 LOG(3, s
, t
, "Sending login for %s/%s to RADIUS\n", user
, pass
);
164 if ((session
[s
].mrru
) && (!first_session_in_bundle(s
)))
165 radiussend(r
, RADIUSJUSTAUTH
);
167 radiussend(r
, RADIUSAUTH
);
171 // Process CHAP messages
172 void processchap(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
179 LOG_HEX(5, "CHAP", p
, l
);
183 LOG(1, s
, t
, "Short CHAP %u bytes\n", l
);
184 STAT(tunnel_rx_errors
);
185 sessionshutdown(s
, "Short CHAP packet.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
189 if ((hl
= ntohs(*(uint16_t *) (p
+ 2))) > l
)
191 LOG(1, s
, t
, "Length mismatch CHAP %u/%u\n", hl
, l
);
192 STAT(tunnel_rx_errors
);
193 sessionshutdown(s
, "CHAP length mismatch.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
200 LOG(1, s
, t
, "Unexpected CHAP response code %d\n", *p
);
201 STAT(tunnel_rx_errors
);
202 sessionshutdown(s
, "CHAP length mismatch.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
206 if (session
[s
].ppp
.phase
!= Authenticate
)
208 LOG(2, s
, t
, "CHAP ignored in %s phase\n", ppp_phase(session
[s
].ppp
.phase
));
212 r
= sess_local
[s
].radius
;
215 LOG(3, s
, t
, "Unexpected CHAP message\n");
217 // Some modems (Netgear DM602, possibly others) persist in using CHAP even
218 // after ACKing our ConfigReq for PAP.
219 if (sess_local
[s
].lcp_authtype
== AUTHPAP
&& config
->radius_authtypes
& AUTHCHAP
)
221 sess_local
[s
].lcp_authtype
= AUTHCHAP
;
227 if (p
[1] != radius
[r
].id
)
229 LOG(1, s
, t
, "Wrong CHAP response ID %d (should be %d) (%d)\n", p
[1], radius
[r
].id
, r
);
230 STAT(tunnel_rx_errors
);
231 sessionshutdown(s
, "Unexpected CHAP response ID.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
235 if (l
< 5 || p
[4] != 16)
237 LOG(1, s
, t
, "Bad CHAP response length %d\n", l
< 5 ? -1 : p
[4]);
238 STAT(tunnel_rx_errors
);
239 sessionshutdown(s
, "Bad CHAP response length.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
245 if (l
< 16 || l
- 16 >= sizeof(session
[s
].user
))
247 LOG(1, s
, t
, "CHAP user too long %d\n", l
- 16);
248 STAT(tunnel_rx_errors
);
249 sessionshutdown(s
, "CHAP username too long.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
253 // Run PRE_AUTH plugins
255 struct param_pre_auth packet
= { &tunnel
[t
], &session
[s
], NULL
, NULL
, PPPCHAP
, 1 };
257 packet
.password
= calloc(17, 1);
258 memcpy(packet
.password
, p
, 16);
263 packet
.username
= calloc(l
+ 1, 1);
264 memcpy(packet
.username
, p
, l
);
267 if ((!config
->disable_lac_func
) && lac_conf_forwardtoremotelns(s
, packet
.username
))
269 free(packet
.username
);
270 free(packet
.password
);
271 // Creating a tunnel/session has been started
276 run_plugins(PLUGIN_PRE_AUTH
, &packet
);
277 if (!packet
.continue_auth
)
279 LOG(3, s
, t
, "A plugin rejected PRE_AUTH\n");
280 if (packet
.username
) free(packet
.username
);
281 if (packet
.password
) free(packet
.password
);
285 strncpy(session
[s
].user
, packet
.username
, sizeof(session
[s
].user
) - 1);
286 memcpy(radius
[r
].pass
, packet
.password
, 16);
288 free(packet
.username
);
289 free(packet
.password
);
293 LOG(3, s
, t
, "CHAP login %s\n", session
[s
].user
);
294 if ((session
[s
].mrru
) && (!first_session_in_bundle(s
)))
295 radiussend(r
, RADIUSJUSTAUTH
);
297 radiussend(r
, RADIUSAUTH
);
300 static void dumplcp(uint8_t *p
, int l
)
303 uint8_t *o
= (p
+ 4);
305 LOG_HEX(5, "PPP LCP Packet", p
, l
);
306 LOG(4, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p
, ppp_code((int)*p
), ntohs( ((uint16_t *) p
)[1]) );
307 LOG(4, 0, 0, "Length: %d\n", l
);
308 if (*p
!= ConfigReq
&& *p
!= ConfigRej
&& *p
!= ConfigAck
)
317 LOG(4, 0, 0, " Option length is %d...\n", length
);
322 LOG(4, 0, 0, " Option type is 0...\n");
329 case 1: // Maximum-Receive-Unit
331 LOG(4, 0, 0, " %s %d\n", ppp_lcp_option(type
), ntohs(*(uint16_t *)(o
+ 2)));
333 LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type
), length
);
335 case 2: // Async-Control-Character-Map
338 uint32_t asyncmap
= ntohl(*(uint32_t *)(o
+ 2));
339 LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type
), asyncmap
);
342 LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type
), length
);
344 case 3: // Authentication-Protocol
347 int proto
= ntohs(*(uint16_t *)(o
+ 2));
348 LOG(4, 0, 0, " %s 0x%x (%s)\n", ppp_lcp_option(type
), proto
,
349 proto
== PPPPAP
? "PAP" : "UNSUPPORTED");
351 else if (length
== 5)
353 int proto
= ntohs(*(uint16_t *)(o
+ 2));
355 LOG(4, 0, 0, " %s 0x%x 0x%x (%s)\n", ppp_lcp_option(type
), proto
, algo
,
356 (proto
== PPPCHAP
&& algo
== 5) ? "CHAP MD5" : "UNSUPPORTED");
359 LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type
), length
);
361 case 4: // Quality-Protocol
363 uint32_t qp
= ntohl(*(uint32_t *)(o
+ 2));
364 LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type
), qp
);
367 case 5: // Magic-Number
370 uint32_t magicno
= ntohl(*(uint32_t *)(o
+ 2));
371 LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type
), magicno
);
374 LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type
), length
);
376 case 7: // Protocol-Field-Compression
377 case 8: // Address-And-Control-Field-Compression
378 LOG(4, 0, 0, " %s\n", ppp_lcp_option(type
));
381 LOG(2, 0, 0, " Unknown PPP LCP Option type %d\n", type
);
389 void lcp_open(sessionidt s
, tunnelidt t
)
391 // transition to Authentication or Network phase:
392 session
[s
].ppp
.phase
= sess_local
[s
].lcp_authtype
? Authenticate
: Network
;
394 LOG(3, s
, t
, "LCP: Opened, phase %s\n", ppp_phase(session
[s
].ppp
.phase
));
397 change_state(s
, lcp
, Opened
);
399 if (session
[s
].ppp
.phase
== Authenticate
)
401 if (sess_local
[s
].lcp_authtype
== AUTHCHAP
)
406 if(session
[s
].bundle
== 0 || bundle
[session
[s
].bundle
].num_of_links
== 1)
410 change_state(s
, ipcp
, RequestSent
);
411 // move to passive state for IPv6 (if configured), CCP
412 if (config
->ipv6_prefix
.s6_addr
[0])
413 change_state(s
, ipv6cp
, Stopped
);
415 change_state(s
, ipv6cp
, Closed
);
417 change_state(s
, ccp
, Stopped
);
421 sessionidt first_ses
= bundle
[session
[s
].bundle
].members
[0];
422 LOG(3, s
, t
, "MPPP: Skipping IPCP negotiation for session:%d, first session of bundle is:%d\n",s
,first_ses
);
428 void lcp_restart(sessionidt s
)
430 session
[s
].ppp
.phase
= Establish
;
432 change_state(s
, ipcp
, Dead
);
433 change_state(s
, ipv6cp
, Dead
);
434 change_state(s
, ccp
, Dead
);
437 static uint8_t *ppp_conf_rej(sessionidt s
, uint8_t *buf
, size_t blen
, uint16_t mtype
,
438 uint8_t **response
, uint8_t *queued
, uint8_t *packet
, uint8_t *option
)
440 if (!*response
|| **response
!= ConfigRej
)
442 queued
= *response
= makeppp(buf
, blen
, packet
, 2, s
, session
[s
].tunnel
, mtype
, 0, 0, 0);
450 if ((queued
- buf
+ option
[1]) > blen
)
452 LOG(2, s
, session
[s
].tunnel
, "PPP overflow for ConfigRej (proto %u, option %u).\n", mtype
, *option
);
456 memcpy(queued
, option
, option
[1]);
457 return queued
+ option
[1];
460 static uint8_t *ppp_conf_nak(sessionidt s
, uint8_t *buf
, size_t blen
, uint16_t mtype
,
461 uint8_t **response
, uint8_t *queued
, uint8_t *packet
, uint8_t *option
,
462 uint8_t *value
, size_t vlen
)
467 case PPPLCP
: nak_sent
= &sess_local
[s
].lcp
.nak_sent
; break;
468 case PPPIPCP
: nak_sent
= &sess_local
[s
].ipcp
.nak_sent
; break;
469 case PPPIPV6CP
: nak_sent
= &sess_local
[s
].ipv6cp
.nak_sent
; break;
470 default: return 0; // ?
473 if (*response
&& **response
!= ConfigNak
)
475 if (*nak_sent
< config
->ppp_max_failure
) // reject queued
478 return ppp_conf_rej(s
, buf
, blen
, mtype
, response
, 0, packet
, option
);
483 if (*nak_sent
>= config
->ppp_max_failure
)
484 return ppp_conf_rej(s
, buf
, blen
, mtype
, response
, 0, packet
, option
);
486 queued
= *response
= makeppp(buf
, blen
, packet
, 2, s
, session
[s
].tunnel
, mtype
, 0, 0, 0);
495 if ((queued
- buf
+ vlen
+ 2) > blen
)
497 LOG(2, s
, session
[s
].tunnel
, "PPP overflow for ConfigNak (proto %u, option %u).\n", mtype
, *option
);
502 *queued
++ = vlen
+ 2;
503 memcpy(queued
, value
, vlen
);
504 return queued
+ vlen
;
507 static void ppp_code_rej(sessionidt s
, tunnelidt t
, uint16_t proto
,
508 char *pname
, uint8_t *p
, uint16_t l
, uint8_t *buf
, size_t size
)
511 int mru
= session
[s
].mru
;
512 if (mru
< MINMTU
) mru
= MINMTU
;
513 if (mru
> size
) mru
= size
;
516 if (l
> mru
) l
= mru
;
518 q
= makeppp(buf
, size
, 0, 0, s
, t
, proto
, 0, 0, 0);
522 *(q
+ 1) = ++sess_local
[s
].lcp_ident
;
523 *(uint16_t *)(q
+ 2) = htons(l
);
524 memcpy(q
+ 4, p
, l
- 4);
526 LOG(2, s
, t
, "Unexpected %s code %s\n", pname
, ppp_code(*p
));
527 LOG(3, s
, t
, "%s: send %s\n", pname
, ppp_code(*q
));
528 if (config
->debug
> 3) dumplcp(q
, l
);
530 tunnelsend(buf
, l
+ (q
- buf
), t
);
533 // Process LCP messages
534 void processlcp(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
542 LOG_HEX(5, "LCP", p
, l
);
545 LOG(1, s
, t
, "Short LCP %d bytes\n", l
);
546 STAT(tunnel_rx_errors
);
550 if ((hl
= ntohs(*(uint16_t *) (p
+ 2))) > l
)
552 LOG(1, s
, t
, "Length mismatch LCP %u/%u\n", hl
, l
);
553 STAT(tunnel_rx_errors
);
558 if (session
[s
].die
) // going down...
561 LOG((*p
== EchoReq
|| *p
== EchoReply
) ? 4 : 3, s
, t
,
562 "LCP: recv %s\n", ppp_code(*p
));
564 if (config
->debug
> 3) dumplcp(p
, l
);
569 uint8_t *o
= (p
+ 4);
577 if (length
== 0 || type
== 0 || x
< length
) break;
580 case 3: // Authentication-Protocol
582 int proto
= ntohs(*(uint16_t *)(o
+ 2));
585 else if (proto
== PPPCHAP
&& *(o
+ 4) == 5)
595 if (!session
[s
].ip
&& authtype
)
596 sess_local
[s
].lcp_authtype
= authtype
;
598 switch (session
[s
].ppp
.lcp
)
601 initialise_restart_count(s
, lcp
);
602 change_state(s
, lcp
, AckReceived
);
607 LOG(2, s
, t
, "LCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session
[s
].ppp
.lcp
));
608 if (session
[s
].ppp
.lcp
== Opened
)
612 change_state(s
, lcp
, RequestSent
);
620 LOG(2, s
, t
, "LCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.lcp
));
623 else if (*p
== ConfigReq
)
626 uint8_t *o
= (p
+ 4);
627 uint8_t *response
= 0;
628 static uint8_t asyncmap
[4] = { 0, 0, 0, 0 }; // all zero
629 static uint8_t authproto
[5];
637 if (length
== 0 || type
== 0 || x
< length
) break;
640 case 1: // Maximum-Receive-Unit
642 uint16_t mru
= ntohs(*(uint16_t *)(o
+ 2));
645 session
[s
].mru
= mru
;
650 LOG(3, s
, t
, " Remote requesting MRU of %u. Rejecting.\n", mru
);
652 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPLCP
, &response
, q
, p
, o
, (uint8_t *) &mru
, sizeof(mru
));
656 case 2: // Async-Control-Character-Map
657 if (!ntohl(*(uint32_t *)(o
+ 2))) // all bits zero is OK
660 LOG(3, s
, t
, " Remote requesting asyncmap. Rejecting.\n");
661 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPLCP
, &response
, q
, p
, o
, asyncmap
, sizeof(asyncmap
));
664 case 3: // Authentication-Protocol
666 int proto
= ntohs(*(uint16_t *)(o
+ 2));
667 char proto_name
[] = "0x0000";
672 if (config
->radius_authtypes
& AUTHPAP
)
674 sess_local
[s
].lcp_authtype
= AUTHPAP
;
678 strcpy(proto_name
, "PAP");
680 else if (proto
== PPPCHAP
)
682 if (config
->radius_authtypes
& AUTHCHAP
683 && *(o
+ 4) == 5) // MD5
685 sess_local
[s
].lcp_authtype
= AUTHCHAP
;
689 strcpy(proto_name
, "CHAP");
692 sprintf(proto_name
, "%#4.4x", proto
);
694 LOG(3, s
, t
, " Remote requesting %s authentication. Rejecting.\n", proto_name
);
696 alen
= add_lcp_auth(authproto
, sizeof(authproto
), config
->radius_authprefer
);
697 if (alen
< 2) break; // paranoia
699 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPLCP
, &response
, q
, p
, o
, authproto
+ 2, alen
- 2);
700 if (q
&& *response
== ConfigNak
&&
701 config
->radius_authtypes
!= config
->radius_authprefer
)
704 alen
= add_lcp_auth(authproto
, sizeof(authproto
), config
->radius_authtypes
& ~config
->radius_authprefer
);
706 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPLCP
, &response
, q
, p
, o
, authproto
+ 2, alen
- 2);
713 case 4: // Quality-Protocol
714 case 5: // Magic-Number
715 case 7: // Protocol-Field-Compression
716 case 8: // Address-And-Control-Field-Compression
719 case 17: // Multilink Max-Receive-Reconstructed-Unit
721 uint16_t mrru
= ntohs(*(uint16_t *)(o
+ 2));
722 session
[s
].mrru
= mrru
;
724 LOG(3, s
, t
, " Received PPP LCP option MRRU: %d\n",mrru
);
728 case 18: // Multilink Short Sequence Number Header Format
732 LOG(3, s
, t
, " Received PPP LCP option MSSN format\n");
736 case 19: // Multilink Endpoint Discriminator
738 uint8_t epdis_class
= o
[2];
741 session
[s
].epdis
.addr_class
= epdis_class
;
742 session
[s
].epdis
.length
= length
- 3;
743 if (session
[s
].epdis
.length
> 20)
745 LOG(1, s
, t
, "Error: received EndDis Address Length more than 20: %d\n", session
[s
].epdis
.length
);
746 session
[s
].epdis
.length
= 20;
749 for (addr
= 0; addr
< session
[s
].epdis
.length
; addr
++)
750 session
[s
].epdis
.address
[addr
] = o
[3+addr
];
757 LOG(3, s
, t
, " Received PPP LCP option Multilink EndDis Local Address Class: %d\n",epdis_class
);
760 LOG(3, s
, t
, " Received PPP LCP option Multilink EndDis IP Address Class: %d\n",epdis_class
);
763 LOG(3, s
, t
, " Received PPP LCP option Multilink EndDis IEEE MAC Address Class: %d\n",epdis_class
);
766 LOG(3, s
, t
, " Received PPP LCP option Multilink EndDis PPP Magic No Class: %d\n",epdis_class
);
769 LOG(3, s
, t
, " Received PPP LCP option Multilink EndDis PSND No Class: %d\n",epdis_class
);
772 LOG(3, s
, t
, " Received PPP LCP option Multilink EndDis NULL Class %d\n",epdis_class
);
777 default: // Reject any unknown options
778 LOG(3, s
, t
, " Rejecting unknown PPP LCP option %d\n", type
);
779 q
= ppp_conf_rej(s
, b
, sizeof(b
), PPPLCP
, &response
, q
, p
, o
);
786 cluster_send_session(s
);
790 l
= q
- response
; // LCP packet length
791 *((uint16_t *) (response
+ 2)) = htons(l
); // update header
795 // Send packet back as ConfigAck
796 response
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPLCP
, 0, 0, 0);
797 if (!response
) return;
798 *response
= ConfigAck
;
801 switch (session
[s
].ppp
.lcp
)
804 response
= makeppp(b
, sizeof(b
), p
, 2, s
, t
, PPPLCP
, 0, 0, 0);
805 if (!response
) return;
806 *response
= TerminateAck
;
807 *((uint16_t *) (response
+ 2)) = htons(l
= 4);
811 initialise_restart_count(s
, lcp
);
813 if (*response
== ConfigAck
)
814 change_state(s
, lcp
, AckSent
);
816 change_state(s
, lcp
, RequestSent
);
821 if (*response
== ConfigAck
)
822 change_state(s
, lcp
, AckSent
);
827 if (*response
== ConfigAck
)
838 if (*response
== ConfigAck
)
839 change_state(s
, lcp
, AckSent
);
841 change_state(s
, lcp
, RequestSent
);
846 sessionshutdown(s
, "LCP: ConfigReq in state Closing. This should not happen. Killing session.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
850 LOG(2, s
, t
, "LCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.lcp
));
854 LOG(3, s
, t
, "LCP: send %s\n", ppp_code(*response
));
855 if (config
->debug
> 3) dumplcp(response
, l
);
857 tunnelsend(b
, l
+ (response
- b
), t
);
859 else if (*p
== ConfigNak
|| *p
== ConfigRej
)
862 uint8_t *o
= (p
+ 4);
870 if (length
== 0 || type
== 0 || x
< length
) break;
873 case 1: // Maximum-Receive-Unit
876 if (length
< 4) break;
877 sess_local
[s
].ppp_mru
= ntohs(*(uint16_t *)(o
+ 2));
878 LOG(3, s
, t
, " Remote requested MRU of %u\n", sess_local
[s
].ppp_mru
);
882 sess_local
[s
].ppp_mru
= 0;
883 LOG(3, s
, t
, " Remote rejected MRU negotiation\n");
888 case 3: // Authentication-Protocol
896 if (length
< 4) break;
897 proto
= ntohs(*(uint16_t *)(o
+ 2));
901 authtype
= config
->radius_authtypes
& AUTHPAP
;
902 LOG(3, s
, t
, " Remote requested PAP authentication...%sing\n",
903 authtype
? "accept" : "reject");
905 else if (proto
== PPPCHAP
&& length
> 4 && *(o
+ 4) == 5)
907 authtype
= config
->radius_authtypes
& AUTHCHAP
;
908 LOG(3, s
, t
, " Remote requested CHAP authentication...%sing\n",
909 authtype
? "accept" : "reject");
913 LOG(3, s
, t
, " Rejecting unsupported authentication %#4x\n",
919 LOG(2, s
, t
, "LCP: remote rejected auth negotiation\n");
920 authtype
= 0; // shutdown
925 case 5: // Magic-Number
926 session
[s
].magic
= 0;
929 if (length
< 6) break;
930 session
[s
].magic
= ntohl(*(uint32_t *)(o
+ 2));
933 if (session
[s
].magic
)
934 LOG(3, s
, t
, " Remote requested magic-no %x\n", session
[s
].magic
);
936 LOG(3, s
, t
, " Remote rejected magic-no\n");
938 cluster_send_session(s
);
941 case 17: // Multilink Max-Receive-Reconstructed-Unit
945 sess_local
[s
].mp_mrru
= ntohs(*(uint16_t *)(o
+ 2));
946 LOG(3, s
, t
, " Remote requested MRRU of %u\n", sess_local
[s
].mp_mrru
);
950 sess_local
[s
].mp_mrru
= 0;
951 LOG(3, s
, t
, " Remote rejected MRRU negotiation\n");
956 case 18: // Multilink Short Sequence Number Header Format
960 sess_local
[s
].mp_mssf
= 0;
961 LOG(3, s
, t
, " Remote requested Naked mssf\n");
965 sess_local
[s
].mp_mssf
= 0;
966 LOG(3, s
, t
, " Remote rejected mssf\n");
971 case 19: // Multilink Endpoint Discriminator
975 LOG(2, s
, t
, " Remote should not configNak Endpoint Dis!\n");
979 sess_local
[s
].mp_epdis
= 0;
980 LOG(3, s
, t
, " Remote rejected Endpoint Discriminator\n");
986 LOG(2, s
, t
, "LCP: remote sent %s for type %u?\n", ppp_code(*p
), type
);
987 sessionshutdown(s
, "Unable to negotiate LCP.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
996 sessionshutdown(s
, "Unsupported authentication.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
1001 sess_local
[s
].lcp_authtype
= authtype
;
1003 switch (session
[s
].ppp
.lcp
)
1008 uint8_t *response
= makeppp(b
, sizeof(b
), p
, 2, s
, t
, PPPLCP
, 0, 0, 0);
1009 if (!response
) return;
1010 *response
= TerminateAck
;
1011 *((uint16_t *) (response
+ 2)) = htons(l
= 4);
1013 LOG(3, s
, t
, "LCP: send %s\n", ppp_code(*response
));
1014 if (config
->debug
> 3) dumplcp(response
, l
);
1016 tunnelsend(b
, l
+ (response
- b
), t
);
1022 initialise_restart_count(s
, lcp
);
1027 LOG(2, s
, t
, "LCP: ConfigNak in state %s? Sending ConfigReq\n", ppp_state(session
[s
].ppp
.lcp
));
1037 LOG(2, s
, t
, "LCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.lcp
));
1041 else if (*p
== TerminateReq
)
1043 switch (session
[s
].ppp
.lcp
)
1056 zero_restart_count(s
, lcp
);
1057 change_state(s
, lcp
, Closing
);
1061 LOG(2, s
, t
, "LCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.lcp
));
1065 *p
= TerminateAck
; // send ack
1066 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPLCP
, 0, 0, 0);
1069 LOG(3, s
, t
, "LCP: send %s\n", ppp_code(*q
));
1070 if (config
->debug
> 3) dumplcp(q
, l
);
1072 tunnelsend(b
, l
+ (q
- b
), t
); // send it
1074 else if (*p
== ProtocolRej
)
1081 if (l
> 5 && !(proto
& 1))
1088 if (proto
== PPPIPV6CP
)
1090 LOG(3, s
, t
, "IPv6 rejected\n");
1091 change_state(s
, ipv6cp
, Closed
);
1095 LOG(3, s
, t
, "LCP protocol reject: 0x%04X\n", proto
);
1098 else if (*p
== EchoReq
)
1100 *p
= EchoReply
; // reply
1101 *(uint32_t *) (p
+ 4) = htonl(session
[s
].magic
); // our magic number
1102 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPLCP
, 0, 0, 0);
1105 LOG(4, s
, t
, "LCP: send %s\n", ppp_code(*q
));
1106 if (config
->debug
> 3) dumplcp(q
, l
);
1108 tunnelsend(b
, l
+ (q
- b
), t
); // send it
1110 else if (*p
== EchoReply
)
1112 // Ignore it, last_packet time is set earlier than this.
1114 else if (*p
!= CodeRej
)
1116 ppp_code_rej(s
, t
, PPPLCP
, "LCP", p
, l
, b
, sizeof(b
));
1120 int join_bundle(sessionidt s
)
1122 // Search for a bundle to join
1125 for (i
= 1; i
< MAXBUNDLE
; i
++)
1127 if (bundle
[i
].state
!= BUNDLEFREE
)
1129 if (epdiscmp(session
[s
].epdis
,bundle
[i
].epdis
) && !strcmp(session
[s
].user
, bundle
[i
].user
))
1131 sessionidt first_ses
= bundle
[i
].members
[0];
1132 if (bundle
[i
].mssf
!= session
[s
].mssf
)
1134 // uniformity of sequence number format must be insured
1135 LOG(3, s
, session
[s
].tunnel
, "MPPP: unable to bundle session %d in bundle %d cause of different mssf\n", s
, i
);
1138 session
[s
].bundle
= i
;
1139 session
[s
].ip
= session
[first_ses
].ip
;
1140 session
[s
].dns1
= session
[first_ses
].dns1
;
1141 session
[s
].dns2
= session
[first_ses
].dns2
;
1142 session
[s
].timeout
= session
[first_ses
].timeout
;
1144 if(session
[s
].epdis
.length
> 0)
1145 setepdis(&bundle
[i
].epdis
, session
[s
].epdis
);
1147 strcpy(bundle
[i
].user
, session
[s
].user
);
1148 bundle
[i
].members
[bundle
[i
].num_of_links
] = s
;
1149 bundle
[i
].num_of_links
++;
1150 LOG(3, s
, session
[s
].tunnel
, "MPPP: Bundling additional line in bundle (%d), lines:%d\n",i
,bundle
[i
].num_of_links
);
1156 // No previously created bundle was found for this session, so create a new one
1157 if (!(b
= new_bundle())) return 0;
1159 session
[s
].bundle
= b
;
1160 bundle
[b
].mrru
= session
[s
].mrru
;
1161 bundle
[b
].mssf
= session
[s
].mssf
;
1162 // FIXME !!! to enable l2tpns reading mssf frames receiver_max_seq, sender_max_seq must be introduce
1163 // now session[s].mssf flag indecates that the receiver wish to receive frames in mssf, so max_seq (i.e. recv_max_seq) = 1<<24
1166 bundle[b].max_seq = 1 << 12;
1168 bundle
[b
].max_seq
= 1 << 24;
1169 if(session
[s
].epdis
.length
> 0)
1170 setepdis(&bundle
[b
].epdis
, session
[s
].epdis
);
1172 strcpy(bundle
[b
].user
, session
[s
].user
);
1173 bundle
[b
].members
[0] = s
;
1174 bundle
[b
].timeout
= session
[s
].timeout
;
1175 LOG(3, s
, session
[s
].tunnel
, "MPPP: Created a new bundle (%d)\n", b
);
1179 static int epdiscmp(epdist ep1
, epdist ep2
)
1182 if (ep1
.length
!= ep2
.length
)
1185 if (ep1
.addr_class
!= ep2
.addr_class
)
1188 for (ad
= 0; ad
< ep1
.length
; ad
++)
1189 if (ep1
.address
[ad
] != ep2
.address
[ad
])
1195 static void setepdis(epdist
*ep1
, epdist ep2
)
1198 ep1
->length
= ep2
.length
;
1199 ep1
->addr_class
= ep2
.addr_class
;
1200 for (ad
= 0; ad
< ep2
.length
; ad
++)
1201 ep1
->address
[ad
] = ep2
.address
[ad
];
1204 static bundleidt
new_bundle()
1207 for (i
= 1; i
< MAXBUNDLE
; i
++)
1209 if (bundle
[i
].state
== BUNDLEFREE
)
1211 LOG(4, 0, 0, "MPPP: Assigning bundle ID %d\n", i
);
1212 bundle
[i
].num_of_links
= 1;
1213 bundle
[i
].last_check
= time_now
; // Initialize last_check value
1214 bundle
[i
].state
= BUNDLEOPEN
;
1215 bundle
[i
].current_ses
= -1; // This is to enforce the first session 0 to be used at first
1216 memset(&frag
[i
], 0, sizeof(fragmentationt
));
1217 if (i
> config
->cluster_highest_bundleid
)
1218 config
->cluster_highest_bundleid
= i
;
1222 LOG(0, 0, 0, "MPPP: Can't find a free bundle! There shouldn't be this many in use!\n");
1226 static void ipcp_open(sessionidt s
, tunnelidt t
)
1228 LOG(3, s
, t
, "IPCP: Opened, session is now active\n");
1230 change_state(s
, ipcp
, Opened
);
1232 if (!(session
[s
].walled_garden
|| session
[s
].flags
& SESSION_STARTED
))
1234 uint16_t r
= radiusnew(s
);
1237 radiussend(r
, RADIUSSTART
); // send radius start
1239 // don't send further Start records if IPCP is restarted
1240 session
[s
].flags
|= SESSION_STARTED
;
1241 cluster_send_session(s
);
1245 // start IPv6 if configured and still in passive state
1246 if (session
[s
].ppp
.ipv6cp
== Stopped
)
1249 change_state(s
, ipv6cp
, RequestSent
);
1253 // Process IPCP messages
1254 void processipcp(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
1256 uint8_t b
[MAXETHER
];
1262 LOG_HEX(5, "IPCP", p
, l
);
1265 LOG(1, s
, t
, "Short IPCP %d bytes\n", l
);
1266 STAT(tunnel_rx_errors
);
1270 if ((hl
= ntohs(*(uint16_t *) (p
+ 2))) > l
)
1272 LOG(1, s
, t
, "Length mismatch IPCP %u/%u\n", hl
, l
);
1273 STAT(tunnel_rx_errors
);
1278 if (session
[s
].ppp
.phase
< Network
)
1280 LOG(2, s
, t
, "IPCP %s ignored in %s phase\n", ppp_code(*p
), ppp_phase(session
[s
].ppp
.phase
));
1284 LOG(3, s
, t
, "IPCP: recv %s\n", ppp_code(*p
));
1286 if (*p
== ConfigAck
)
1288 switch (session
[s
].ppp
.ipcp
)
1291 initialise_restart_count(s
, ipcp
);
1292 change_state(s
, ipcp
, AckReceived
);
1297 LOG(2, s
, t
, "IPCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session
[s
].ppp
.ipcp
));
1299 change_state(s
, ipcp
, RequestSent
);
1307 LOG(2, s
, t
, "IPCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ipcp
));
1310 else if (*p
== ConfigReq
)
1312 uint8_t *response
= 0;
1320 if (!o
[1] || o
[1] > length
) return;
1324 case 3: // ip address
1325 gotip
++; // seen address
1326 if (o
[1] != 6) return;
1328 addr
= htonl(session
[s
].ip
);
1329 if (memcmp(o
+ 2, &addr
, (sizeof addr
)))
1332 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPIPCP
, &response
, q
, p
, o
, (uint8_t *) &addr
, sizeof(addr
));
1333 if (!q
|| (q
!= oq
&& *response
== ConfigRej
))
1335 sessionshutdown(s
, "Can't negotiate IPCP.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
1342 case 129: // primary DNS
1343 if (o
[1] != 6) return;
1345 addr
= htonl(session
[s
].dns1
);
1346 if (memcmp(o
+ 2, &addr
, (sizeof addr
)))
1348 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPIPCP
, &response
, q
, p
, o
, (uint8_t *) &addr
, sizeof(addr
));
1354 case 131: // secondary DNS
1355 if (o
[1] != 6) return;
1357 addr
= htonl(session
[s
].dns2
);
1358 if (memcmp(o
+ 2, &addr
, sizeof(addr
)))
1360 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPIPCP
, &response
, q
, p
, o
, (uint8_t *) &addr
, sizeof(addr
));
1367 LOG(2, s
, t
, " Rejecting PPP IPCP Option type %d\n", *o
);
1368 q
= ppp_conf_rej(s
, b
, sizeof(b
), PPPIPCP
, &response
, q
, p
, o
);
1378 l
= q
- response
; // IPCP packet length
1379 *((uint16_t *) (response
+ 2)) = htons(l
); // update header
1383 // Send packet back as ConfigAck
1384 response
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPIPCP
, 0, 0, 0);
1385 if (!response
) return;
1386 *response
= ConfigAck
;
1390 LOG(1, s
, t
, "No IP in IPCP request\n");
1391 STAT(tunnel_rx_errors
);
1395 switch (session
[s
].ppp
.ipcp
)
1398 response
= makeppp(b
, sizeof(b
), p
, 2, s
, t
, PPPIPCP
, 0, 0, 0);
1399 if (!response
) return;
1400 *response
= TerminateAck
;
1401 *((uint16_t *) (response
+ 2)) = htons(l
= 4);
1405 initialise_restart_count(s
, ipcp
);
1407 if (*response
== ConfigAck
)
1408 change_state(s
, ipcp
, AckSent
);
1410 change_state(s
, ipcp
, RequestSent
);
1415 if (*response
== ConfigAck
)
1416 change_state(s
, ipcp
, AckSent
);
1421 if (*response
== ConfigAck
)
1427 initialise_restart_count(s
, ipcp
);
1432 if (*response
== ConfigAck
)
1433 change_state(s
, ipcp
, AckSent
);
1435 change_state(s
, ipcp
, RequestSent
);
1440 LOG(2, s
, t
, "IPCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ipcp
));
1444 LOG(3, s
, t
, "IPCP: send %s\n", ppp_code(*response
));
1445 tunnelsend(b
, l
+ (response
- b
), t
);
1447 else if (*p
== TerminateReq
)
1449 switch (session
[s
].ppp
.ipcp
)
1461 zero_restart_count(s
, ipcp
);
1462 change_state(s
, ipcp
, Closing
);
1466 LOG(2, s
, t
, "IPCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ipcp
));
1470 *p
= TerminateAck
; // send ack
1471 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPIPCP
, 0, 0, 0);
1474 LOG(3, s
, t
, "IPCP: send %s\n", ppp_code(*q
));
1475 tunnelsend(b
, l
+ (q
- b
), t
); // send it
1477 else if (*p
!= CodeRej
)
1479 ppp_code_rej(s
, t
, PPPIPCP
, "IPCP", p
, l
, b
, sizeof(b
));
1483 static void ipv6cp_open(sessionidt s
, tunnelidt t
)
1485 LOG(3, s
, t
, "IPV6CP: Opened\n");
1487 change_state(s
, ipv6cp
, Opened
);
1488 if (session
[s
].ipv6prefixlen
)
1489 route6set(s
, session
[s
].ipv6route
, session
[s
].ipv6prefixlen
, 1);
1491 // Send an initial RA (TODO: Should we send these regularly?)
1492 send_ipv6_ra(s
, t
, NULL
);
1495 // Process IPV6CP messages
1496 void processipv6cp(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
1498 uint8_t b
[MAXETHER
];
1502 CSTAT(processipv6cp
);
1504 LOG_HEX(5, "IPV6CP", p
, l
);
1507 LOG(1, s
, t
, "Short IPV6CP %d bytes\n", l
);
1508 STAT(tunnel_rx_errors
);
1512 if ((hl
= ntohs(*(uint16_t *) (p
+ 2))) > l
)
1514 LOG(1, s
, t
, "Length mismatch IPV6CP %u/%u\n", hl
, l
);
1515 STAT(tunnel_rx_errors
);
1520 if (session
[s
].ppp
.phase
< Network
)
1522 LOG(2, s
, t
, "IPV6CP %s ignored in %s phase\n", ppp_code(*p
), ppp_phase(session
[s
].ppp
.phase
));
1526 LOG(3, s
, t
, "IPV6CP: recv %s\n", ppp_code(*p
));
1530 LOG(3, s
, t
, "IPV6CP: no IPv4 address (IPCP in state %s)\n", ppp_state(session
[s
].ppp
.ipcp
));
1531 return; // need IPCP to complete...
1534 if (*p
== ConfigAck
)
1536 switch (session
[s
].ppp
.ipv6cp
)
1539 initialise_restart_count(s
, ipv6cp
);
1540 change_state(s
, ipv6cp
, AckReceived
);
1545 LOG(2, s
, t
, "IPV6CP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session
[s
].ppp
.ipv6cp
));
1547 change_state(s
, ipv6cp
, RequestSent
);
1555 LOG(2, s
, t
, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ipv6cp
));
1558 else if (*p
== ConfigReq
)
1560 uint8_t *response
= 0;
1568 if (!o
[1] || o
[1] > length
) return;
1572 case 1: // interface identifier
1573 gotip
++; // seen address
1574 if (o
[1] != 10) return;
1576 ident
[0] = htonl(session
[s
].ip
);
1579 if (memcmp(o
+ 2, ident
, sizeof(ident
)))
1581 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPIPV6CP
, &response
, q
, p
, o
, (uint8_t *)ident
, sizeof(ident
));
1588 LOG(2, s
, t
, " Rejecting PPP IPV6CP Option type %d\n", *o
);
1589 q
= ppp_conf_rej(s
, b
, sizeof(b
), PPPIPV6CP
, &response
, q
, p
, o
);
1599 l
= q
- response
; // IPV6CP packet length
1600 *((uint16_t *) (response
+ 2)) = htons(l
); // update header
1604 // Send packet back as ConfigAck
1605 response
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPIPV6CP
, 0, 0, 0);
1606 if (!response
) return;
1607 *response
= ConfigAck
;
1611 LOG(1, s
, t
, "No interface identifier in IPV6CP request\n");
1612 STAT(tunnel_rx_errors
);
1616 switch (session
[s
].ppp
.ipv6cp
)
1619 response
= makeppp(b
, sizeof(b
), p
, 2, s
, t
, PPPIPV6CP
, 0, 0, 0);
1620 if (!response
) return;
1621 *response
= TerminateAck
;
1622 *((uint16_t *) (response
+ 2)) = htons(l
= 4);
1626 initialise_restart_count(s
, ipv6cp
);
1628 if (*response
== ConfigAck
)
1629 change_state(s
, ipv6cp
, AckSent
);
1631 change_state(s
, ipv6cp
, RequestSent
);
1636 if (*response
== ConfigAck
)
1637 change_state(s
, ipv6cp
, AckSent
);
1642 if (*response
== ConfigAck
)
1648 initialise_restart_count(s
, ipv6cp
);
1653 if (*response
== ConfigAck
)
1654 change_state(s
, ipv6cp
, AckSent
);
1656 change_state(s
, ipv6cp
, RequestSent
);
1661 LOG(2, s
, t
, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ipv6cp
));
1665 LOG(3, s
, t
, "IPV6CP: send %s\n", ppp_code(*response
));
1666 tunnelsend(b
, l
+ (response
- b
), t
);
1668 else if (*p
== TerminateReq
)
1670 switch (session
[s
].ppp
.ipv6cp
)
1682 zero_restart_count(s
, ipv6cp
);
1683 change_state(s
, ipv6cp
, Closing
);
1687 LOG(2, s
, t
, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ipv6cp
));
1691 *p
= TerminateAck
; // send ack
1692 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPIPV6CP
, 0, 0, 0);
1695 LOG(3, s
, t
, "IPV6CP: send %s\n", ppp_code(*q
));
1696 tunnelsend(b
, l
+ (q
- b
), t
); // send it
1698 else if (*p
!= CodeRej
)
1700 ppp_code_rej(s
, t
, PPPIPV6CP
, "IPV6CP", p
, l
, b
, sizeof(b
));
1704 static void update_sessions_in_stat(sessionidt s
, uint16_t l
)
1706 bundleidt b
= session
[s
].bundle
;
1709 increment_counter(&session
[s
].cin
, &session
[s
].cin_wrap
, l
);
1710 session
[s
].cin_delta
+= l
;
1713 sess_local
[s
].cin
+= l
;
1714 sess_local
[s
].pin
++;
1718 int i
= frag
[b
].re_frame_begin_index
;
1719 int end
= frag
[b
].re_frame_end_index
;
1722 l
= frag
[b
].fragment
[i
].length
;
1723 s
= frag
[b
].fragment
[i
].sid
;
1724 increment_counter(&session
[s
].cin
, &session
[s
].cin_wrap
, l
);
1725 session
[s
].cin_delta
+= l
;
1728 sess_local
[s
].cin
+= l
;
1729 sess_local
[s
].pin
++;
1732 i
= (i
+ 1) & MAXFRAGNUM_MASK
;
1737 // process IP packet received
1739 // This MUST be called with at least 4 byte behind 'p'.
1740 // (i.e. this routine writes to p[-4]).
1741 void processipin(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
1747 LOG_HEX(5, "IP", p
, l
);
1751 LOG(1, s
, t
, "IP packet too short %d\n", l
);
1752 STAT(tunnel_rx_errors
);
1756 ip
= ntohl(*(uint32_t *)(p
+ 12));
1760 LOG(1, s
, t
, "IP packet too long %d\n", l
);
1761 STAT(tunnel_rx_errors
);
1765 if (session
[s
].ppp
.phase
!= Network
|| session
[s
].ppp
.ipcp
!= Opened
)
1768 if (!session
[s
].bundle
|| bundle
[session
[s
].bundle
].num_of_links
< 2) // FIXME:
1770 // no spoof (do sessionbyip to handled statically routed subnets)
1771 if (ip
!= session
[s
].ip
&& sessionbyip(htonl(ip
)) != s
)
1773 LOG(4, s
, t
, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip
), 0));
1778 // run access-list if any
1779 if (session
[s
].filter_in
&& !ip_filter(p
, l
, session
[s
].filter_in
- 1))
1782 // adjust MSS on SYN and SYN,ACK packets with options
1783 if ((ntohs(*(uint16_t *) (p
+ 6)) & 0x1fff) == 0 && p
[9] == IPPROTO_TCP
) // first tcp fragment
1785 int ihl
= (p
[0] & 0xf) * 4; // length of IP header
1786 if (l
>= ihl
+ 20 && (p
[ihl
+ 13] & TCP_FLAG_SYN
) && ((p
[ihl
+ 12] >> 4) > 5))
1787 adjust_tcp_mss(s
, t
, p
, l
, p
+ ihl
);
1790 // Add on the tun header
1792 *(uint32_t *) p
= htonl(PKTIP
);
1795 if (session
[s
].tbf_in
)
1797 // Are we throttling this session?
1798 if (config
->cluster_iam_master
)
1799 tbf_queue_packet(session
[s
].tbf_in
, p
, l
);
1801 master_throttle_packet(session
[s
].tbf_in
, p
, l
);
1806 if (tun_write(p
, l
) < 0)
1808 STAT(tun_tx_errors
);
1809 LOG(0, s
, t
, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
1810 l
, strerror(errno
), tunfd
, p
);
1818 if (session
[s
].snoop_ip
&& session
[s
].snoop_port
)
1820 // Snooping this session
1821 snoop_send_packet(p
, l
, session
[s
].snoop_ip
, session
[s
].snoop_port
);
1824 update_sessions_in_stat(s
, l
);
1828 STAT(tun_tx_packets
);
1829 INC_STAT(tun_tx_bytes
, l
);
1832 // process Multilink PPP packet received
1833 void processmpin(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
1835 bundleidt b
= session
[s
].bundle
;
1836 bundlet
* this_bundle
= &bundle
[b
];
1837 uint32_t maskSeq
, max_seq
;
1839 uint16_t frag_index
, frag_index_next
, frag_index_prev
;
1840 fragmentationt
*this_fragmentation
= &frag
[b
];
1841 uint8_t begin_frame
= (*p
& MP_BEGIN
);
1842 uint8_t end_frame
= (*p
& MP_END
);
1843 uint32_t seq_num
, seq_num_next
, seq_num_prev
;
1846 uint16_t begin_index
, end_index
;
1848 // Perform length checking
1851 LOG(2, s
, t
, "MPPP: discarding fragment larger than MAXFRAGLEN\n");
1857 LOG(2, s
, t
, "MPPP: Invalid bundle id: 0\n");
1860 // FIXME !! session[s].mssf means that the receiver wants to receive frames in mssf not means the receiver will send frames in mssf
1861 /* if(session[s].mssf)
1863 // Get 12 bit for seq number
1864 seq_num = ntohs((*(uint16_t *) p) & 0xFF0F);
1867 // After this point the pointer should be advanced 2 bytes
1868 LOG(3, s, t, "MPPP: 12 bits, sequence number: %d\n",seq_num);
1872 // Get 24 bit for seq number
1873 seq_num
= ntohl((*(uint32_t *) p
) & 0xFFFFFF00);
1876 // After this point the pointer should be advanced 4 bytes
1877 LOG(4, s
, t
, "MPPP: 24 bits sequence number:%d\n",seq_num
);
1880 max_seq
= this_bundle
->max_seq
;
1881 maskSeq
= max_seq
- 1;
1884 * Expand sequence number to 32 bits, making it as close
1885 * as possible to this_fragmentation->M.
1887 seq_num
|= this_fragmentation
->M
& ~maskSeq
;
1888 if ((int)(this_fragmentation
->M
- seq_num
) > (int)(maskSeq
>> 1))
1890 seq_num
+= maskSeq
+ 1;
1892 else if ((int)(seq_num
- this_fragmentation
->M
) > (int)(maskSeq
>> 1))
1894 seq_num
-= maskSeq
+ 1; /* should never happen */
1897 // calculate this fragment's offset from the begin seq in the bundle
1898 frag_offset
= (int) (seq_num
- this_fragmentation
->start_seq
);
1900 sess_local
[s
].last_seq
= seq_num
;
1902 // calculate the jitter average
1903 uint32_t ljitter
= time_now_ms
- sess_local
[s
].prev_time
;
1906 sess_local
[s
].jitteravg
= (sess_local
[s
].jitteravg
+ ljitter
)>>1;
1907 sess_local
[s
].prev_time
= time_now_ms
;
1912 if (seq_num
< this_fragmentation
->M
)
1915 this_fragmentation
->M
= seq_num
;
1919 Mmin
= sess_local
[(this_bundle
->members
[0])].last_seq
;
1920 for (i
= 1; i
< this_bundle
->num_of_links
; i
++)
1922 uint32_t s_seq
= sess_local
[(this_bundle
->members
[i
])].last_seq
;
1926 this_fragmentation
->M
= Mmin
;
1929 // calculate M offset of the M seq in the bundle
1930 int M_offset
= (int) (Mmin
- this_fragmentation
->start_seq
);
1932 if (M_offset
>= MAXFRAGNUM
)
1934 // There have a long break of the link !!!!!!!!
1935 // M_offset is bigger that the fragmentation buffer size
1936 LOG(3, s
, t
, "MPPP: M_offset out of range, min:%d, begin_seq:%d, jitteravg:%d\n", Mmin
, this_fragmentation
->start_seq
, sess_local
[s
].jitteravg
);
1938 // Calculate the new start index, the previous frag are lost
1939 begin_index
= (M_offset
+ this_fragmentation
->start_index
) & MAXFRAGNUM_MASK
;
1941 // Set new Start sequence
1942 this_fragmentation
->start_index
= begin_index
;
1943 this_fragmentation
->start_seq
= Mmin
;
1945 // recalculate the fragment offset from the new begin seq in the bundle
1946 frag_offset
= (int) (seq_num
- Mmin
);
1949 // discard this fragment if the packet comes before the start sequence
1950 if (frag_offset
< 0)
1952 // this packet comes before the next
1953 LOG(3, s
, t
, "MPPP: packet comes before the next, seq:%d, begin_seq:%d, size frag:%d\n", seq_num
, this_fragmentation
->start_seq
, l
);
1957 // discard if frag_offset is bigger that the fragmentation buffer size
1958 if (frag_offset
>= MAXFRAGNUM
)
1960 // frag_offset is bigger that the fragmentation buffer size
1961 LOG(3, s
, t
, "MPPP: Index out of range, seq:%d, begin_seq:%d, jitteravg:%d\n", seq_num
, this_fragmentation
->start_seq
, sess_local
[s
].jitteravg
);
1965 //caculate received fragment's index in the fragment array
1966 frag_index
= (frag_offset
+ this_fragmentation
->start_index
) & MAXFRAGNUM_MASK
;
1968 // insert the frame in it's place
1969 fragmentt
*this_frag
= &this_fragmentation
->fragment
[frag_index
];
1971 if (this_frag
->length
> 0)
1972 // This fragment is lost, It was around the buffer and it was never completed the packet.
1973 LOG(3, this_frag
->sid
, this_frag
->tid
, "MPPP: (INSERT) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n",
1974 this_frag
->seq
, frag_index
, this_frag
->flags
, this_frag
->jitteravg
);
1976 this_frag
->length
= l
;
1979 this_frag
->flags
= flags
;
1980 this_frag
->seq
= seq_num
;
1981 this_frag
->jitteravg
= sess_local
[s
].jitteravg
;
1982 memcpy(this_frag
->data
, p
, l
);
1984 LOG(4, s
, t
, "MPPP: seq_num:%d frag_index:%d INSERTED flags: %02X\n", seq_num
, frag_index
, flags
);
1987 frag_index_next
= (frag_index
+ 1) & MAXFRAGNUM_MASK
;
1988 //previous frag index
1989 frag_index_prev
= (frag_index
- 1) & MAXFRAGNUM_MASK
;
1991 seq_num_next
= seq_num
+ 1;
1993 seq_num_prev
= seq_num
- 1;
1995 // Clean the buffer and log the lost fragments
1996 if ((frag_index_next
!= this_fragmentation
->start_index
) && this_fragmentation
->fragment
[frag_index_next
].length
)
1998 // check if the next frag is a lost fragment
1999 if (this_fragmentation
->fragment
[frag_index_next
].seq
!= seq_num_next
)
2001 // This fragment is lost, It was around the buffer and it was never completed the packet.
2002 LOG(3, this_fragmentation
->fragment
[frag_index_next
].sid
, this_fragmentation
->fragment
[frag_index_next
].tid
,
2003 "MPPP: (NEXT) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n",
2004 this_fragmentation
->fragment
[frag_index_next
].seq
, frag_index_next
,
2005 this_fragmentation
->fragment
[frag_index_next
].flags
, this_fragmentation
->fragment
[frag_index_next
].jitteravg
);
2006 // this frag is lost
2007 this_fragmentation
->fragment
[frag_index_next
].length
= 0;
2008 this_fragmentation
->fragment
[frag_index_next
].flags
= 0;
2010 if (begin_frame
&& (!end_frame
)) return; // assembling frame failed
2014 // Clean the buffer and log the lost fragments
2015 if ((frag_index
!= this_fragmentation
->start_index
) && this_fragmentation
->fragment
[frag_index_prev
].length
)
2017 // check if the next frag is a lost fragment
2018 if (this_fragmentation
->fragment
[frag_index_prev
].seq
!= seq_num_prev
)
2020 // This fragment is lost, It was around the buffer and it was never completed the packet.
2021 LOG(3, this_fragmentation
->fragment
[frag_index_prev
].sid
, this_fragmentation
->fragment
[frag_index_prev
].tid
,
2022 "MPPP: (PREV) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n",
2023 this_fragmentation
->fragment
[frag_index_prev
].seq
, frag_index_prev
,
2024 this_fragmentation
->fragment
[frag_index_prev
].flags
, this_fragmentation
->fragment
[frag_index_prev
].jitteravg
);
2026 this_fragmentation
->fragment
[frag_index_prev
].length
= 0;
2027 this_fragmentation
->fragment
[frag_index_prev
].flags
= 0;
2029 if (end_frame
&& (!begin_frame
)) return; // assembling frame failed
2034 begin_index
= this_fragmentation
->start_index
;
2035 uint32_t b_seq
= this_fragmentation
->start_seq
;
2036 // Try to find a Begin sequence from the start_seq sequence to M sequence
2037 while (b_seq
< Mmin
)
2039 if (this_fragmentation
->fragment
[begin_index
].length
)
2041 if (b_seq
== this_fragmentation
->fragment
[begin_index
].seq
)
2043 if (this_fragmentation
->fragment
[begin_index
].flags
& MP_BEGIN
)
2046 // Adjust the new start sequence and start index
2047 this_fragmentation
->start_index
= begin_index
;
2048 this_fragmentation
->start_seq
= b_seq
;
2049 // Begin Sequence found, now try to found the End Sequence to complete the frame
2050 end_index
= begin_index
;
2051 while (b_seq
< Mmin
)
2053 if (this_fragmentation
->fragment
[end_index
].length
)
2055 if (b_seq
== this_fragmentation
->fragment
[end_index
].seq
)
2057 if (this_fragmentation
->fragment
[end_index
].flags
& MP_END
)
2059 // The End sequence was found and the frame is complete
2066 // This fragment is lost, it was never completed the packet.
2067 LOG(3, this_fragmentation
->fragment
[end_index
].sid
, this_fragmentation
->fragment
[end_index
].tid
,
2068 "MPPP: (FIND END) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n",
2069 this_fragmentation
->fragment
[end_index
].seq
, begin_index
,
2070 this_fragmentation
->fragment
[end_index
].flags
, this_fragmentation
->fragment
[end_index
].jitteravg
);
2071 // this frag is lost
2072 this_fragmentation
->fragment
[end_index
].length
= 0;
2073 this_fragmentation
->fragment
[end_index
].flags
= 0;
2074 // This frame is not complete find the next Begin
2080 // This frame is not complete find the next Begin if exist
2083 end_index
= (end_index
+1) & MAXFRAGNUM_MASK
;
2088 // The End sequence was found and the frame is complete
2091 // find the next Begin
2092 begin_index
= end_index
;
2097 // This fragment is lost, it was never completed the packet.
2098 LOG(3, this_fragmentation
->fragment
[begin_index
].sid
, this_fragmentation
->fragment
[begin_index
].tid
,
2099 "MPPP: (FIND BEGIN) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n",
2100 this_fragmentation
->fragment
[begin_index
].seq
, begin_index
,
2101 this_fragmentation
->fragment
[begin_index
].flags
, this_fragmentation
->fragment
[begin_index
].jitteravg
);
2102 // this frag is lost
2103 this_fragmentation
->fragment
[begin_index
].length
= 0;
2104 this_fragmentation
->fragment
[begin_index
].flags
= 0;
2107 begin_index
= (begin_index
+1) & MAXFRAGNUM_MASK
;
2112 // try to assemble the frame that has the received fragment as a member
2113 // get the beginning of this frame
2114 begin_index
= end_index
= this_fragmentation
->start_index
;
2115 if (this_fragmentation
->fragment
[begin_index
].length
)
2117 if (!(this_fragmentation
->fragment
[begin_index
].flags
& MP_BEGIN
))
2119 // should occur only after an "M_Offset out of range"
2120 // The start sequence must be a begin sequence
2121 this_fragmentation
->start_index
= (begin_index
+1) & MAXFRAGNUM_MASK
;
2122 this_fragmentation
->start_seq
++;
2123 return; // assembling frame failed
2127 return; // assembling frame failed
2129 // get the end of his frame
2130 while (this_fragmentation
->fragment
[end_index
].length
)
2132 if (this_fragmentation
->fragment
[end_index
].flags
& MP_END
)
2135 end_index
= (end_index
+1) & MAXFRAGNUM_MASK
;
2137 if (end_index
== this_fragmentation
->start_index
)
2138 return; // assembling frame failed
2141 // return if a lost fragment is found
2142 if (!(this_fragmentation
->fragment
[end_index
].length
))
2143 return; // assembling frame failed
2145 // assemble the packet
2146 //assemble frame, process it, reset fragmentation
2147 uint16_t cur_len
= 4; // This is set to 4 to leave 4 bytes for function processipin
2149 LOG(4, s
, t
, "MPPP: processing fragments from %d to %d\n", begin_index
, end_index
);
2150 // Push to the receive buffer
2152 for (i
= begin_index
;; i
= (i
+ 1) & MAXFRAGNUM_MASK
)
2154 this_frag
= &this_fragmentation
->fragment
[i
];
2155 if(cur_len
+ this_frag
->length
> MAXETHER
)
2157 LOG(2, s
, t
, "MPPP: discarding reassembled frames larger than MAXETHER\n");
2161 memcpy(this_fragmentation
->reassembled_frame
+cur_len
, this_frag
->data
, this_frag
->length
);
2162 LOG(5, s
, t
, "MPPP: processing frame at %d, with len %d\n", i
, this_frag
->length
);
2164 cur_len
+= this_frag
->length
;
2167 this_fragmentation
->re_frame_len
= cur_len
;
2168 this_fragmentation
->re_frame_begin_index
= begin_index
;
2169 this_fragmentation
->re_frame_end_index
= end_index
;
2170 // Process the resassembled frame
2171 LOG(5, s
, t
, "MPPP: Process the reassembled frame, len=%d\n",cur_len
);
2172 processmpframe(s
, t
, this_fragmentation
->reassembled_frame
, this_fragmentation
->re_frame_len
, 1);
2177 // Set reassembled frame length to zero after processing it
2178 this_fragmentation
->re_frame_len
= 0;
2179 for (i
= begin_index
;; i
= (i
+ 1) & MAXFRAGNUM_MASK
)
2181 this_fragmentation
->fragment
[i
].length
= 0; // Indicates that this fragment has been consumed
2182 this_fragmentation
->fragment
[i
].flags
= 0;
2187 // Set the new start_index and start_seq
2188 this_fragmentation
->start_index
= (end_index
+ 1) & MAXFRAGNUM_MASK
;
2189 this_fragmentation
->start_seq
= this_fragmentation
->fragment
[end_index
].seq
+ 1;
2190 LOG(4, s
, t
, "MPPP after assembling: start index is = %d, start seq=%d\n", this_fragmentation
->start_index
, this_fragmentation
->start_seq
);
2192 begin_index
= this_fragmentation
->start_index
;
2193 if ((this_fragmentation
->fragment
[begin_index
].length
) &&
2194 (this_fragmentation
->fragment
[begin_index
].seq
!= this_fragmentation
->start_seq
))
2196 LOG(3, this_fragmentation
->fragment
[begin_index
].sid
, this_fragmentation
->fragment
[begin_index
].tid
,
2197 "MPPP: (START) seq_num:%d frag_index:%d flags:%d jitteravg:%d is LOST\n",
2198 this_fragmentation
->fragment
[begin_index
].seq
, begin_index
,
2199 this_fragmentation
->fragment
[begin_index
].flags
, this_fragmentation
->fragment
[begin_index
].jitteravg
);
2200 this_fragmentation
->fragment
[begin_index
].length
= 0;
2201 this_fragmentation
->fragment
[begin_index
].flags
= 0;
2204 if (this_fragmentation
->start_seq
<= Mmin
)
2205 // It's possible to find other complete frame or lost frame.
2207 else if ((this_fragmentation
->fragment
[begin_index
].length
) &&
2208 (this_fragmentation
->fragment
[begin_index
].flags
& MP_BEGIN
))
2209 // may be that the next frame is completed
2210 goto assembling_frame
;
2215 // process IPv6 packet received
2217 // This MUST be called with at least 4 byte behind 'p'.
2218 // (i.e. this routine writes to p[-4]).
2219 void processipv6in(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
2224 CSTAT(processipv6in
);
2226 LOG_HEX(5, "IPv6", p
, l
);
2228 ip
= *(struct in6_addr
*) (p
+ 8);
2229 ipv4
= ntohl(*(uint32_t *)(p
+ 16));
2233 LOG(1, s
, t
, "IP packet too long %d\n", l
);
2234 STAT(tunnel_rx_errors
);
2238 if (session
[s
].ppp
.phase
!= Network
|| session
[s
].ppp
.ipv6cp
!= Opened
)
2242 if (ipv4
!= session
[s
].ip
&& memcmp(&config
->ipv6_prefix
, &ip
, 8) && sessionbyipv6(ip
) != s
)
2244 char str
[INET6_ADDRSTRLEN
];
2245 LOG(5, s
, t
, "Dropping packet with spoofed IP %s\n",
2246 inet_ntop(AF_INET6
, &ip
, str
, INET6_ADDRSTRLEN
));
2250 // Check if it's a Router Solicition message.
2251 if (*(p
+ 6) == 58 && *(p
+ 7) == 255 && *(p
+ 24) == 0xFF && *(p
+ 25) == 2 &&
2252 *(uint32_t *)(p
+ 26) == 0 && *(uint32_t *)(p
+ 30) == 0 &&
2253 *(uint32_t *)(p
+ 34) == 0 &&
2254 *(p
+ 38) == 0 && *(p
+ 39) == 2 && *(p
+ 40) == 133) {
2255 LOG(3, s
, t
, "Got IPv6 RS\n");
2256 send_ipv6_ra(s
, t
, &ip
);
2260 // Add on the tun header
2262 *(uint32_t *) p
= htonl(PKTIPV6
);
2265 // Are we throttled and a slave?
2266 if (session
[s
].tbf_in
&& !config
->cluster_iam_master
) {
2267 // Pass it to the master for handling.
2268 master_throttle_packet(session
[s
].tbf_in
, p
, l
);
2272 // Are we throttled and a master??
2273 if (session
[s
].tbf_in
&& config
->cluster_iam_master
) {
2274 // Actually handle the throttled packets.
2275 tbf_queue_packet(session
[s
].tbf_in
, p
, l
);
2280 if (tun_write(p
, l
) < 0)
2282 STAT(tun_tx_errors
);
2283 LOG(0, s
, t
, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
2284 l
, strerror(errno
), tunfd
, p
);
2292 if (session
[s
].snoop_ip
&& session
[s
].snoop_port
)
2294 // Snooping this session
2295 snoop_send_packet(p
, l
, session
[s
].snoop_ip
, session
[s
].snoop_port
);
2298 update_sessions_in_stat(s
, l
);
2302 STAT(tun_tx_packets
);
2303 INC_STAT(tun_tx_bytes
, l
);
2307 // Helper routine for the TBF filters.
2308 // Used to send queued data in from the user.
2310 void send_ipin(sessionidt s
, uint8_t *buf
, int len
)
2312 LOG_HEX(5, "IP in throttled", buf
, len
);
2314 if (write(tunfd
, buf
, len
) < 0)
2316 STAT(tun_tx_errors
);
2317 LOG(0, 0, 0, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
2318 len
, strerror(errno
), tunfd
, buf
);
2326 if (session
[s
].snoop_ip
&& session
[s
].snoop_port
)
2328 // Snooping this session
2329 snoop_send_packet(buf
, len
, session
[s
].snoop_ip
, session
[s
].snoop_port
);
2332 // Increment packet counters
2333 increment_counter(&session
[s
].cin
, &session
[s
].cin_wrap
, len
);
2334 session
[s
].cin_delta
+= len
;
2337 sess_local
[s
].cin
+= len
;
2338 sess_local
[s
].pin
++;
2342 STAT(tun_tx_packets
);
2343 INC_STAT(tun_tx_bytes
, len
- 4);
2347 // Process CCP messages
2348 void processccp(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
2350 uint8_t b
[MAXETHER
];
2355 LOG_HEX(5, "CCP", p
, l
);
2357 if (session
[s
].ppp
.phase
< Network
)
2359 LOG(2, s
, t
, "CCP %s ignored in %s phase\n", ppp_code(*p
), ppp_phase(session
[s
].ppp
.phase
));
2365 LOG(1, s
, t
, "Short CCP packet\n");
2366 STAT(tunnel_rx_errors
);
2369 LOG(4, s
, t
, "CCP: recv %s\n", ppp_code(*p
));
2370 if (*p
== ConfigAck
)
2372 switch (session
[s
].ppp
.ccp
)
2375 initialise_restart_count(s
, ccp
);
2376 change_state(s
, ccp
, AckReceived
);
2381 LOG(2, s
, t
, "CCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session
[s
].ppp
.ccp
));
2383 change_state(s
, ccp
, RequestSent
);
2387 LOG(3, s
, t
, "CCP: Opened\n");
2388 change_state(s
, ccp
, Opened
);
2392 LOG(2, s
, t
, "CCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ccp
));
2395 else if (*p
== ConfigReq
)
2397 if (l
< 6) // accept no compression
2399 else // compression requested--reject
2402 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPCCP
, 0, 0, 0);
2405 switch (session
[s
].ppp
.ccp
)
2408 q
= makeppp(b
, sizeof(b
), p
, 2, s
, t
, PPPCCP
, 0, 0, 0);
2411 *((uint16_t *) (q
+ 2)) = htons(l
= 4);
2415 initialise_restart_count(s
, ccp
);
2417 if (*q
== ConfigAck
)
2418 change_state(s
, ccp
, AckSent
);
2420 change_state(s
, ccp
, RequestSent
);
2425 if (*q
== ConfigAck
)
2426 change_state(s
, ccp
, AckSent
);
2431 if (*q
== ConfigAck
)
2432 change_state(s
, ccp
, Opened
);
2437 initialise_restart_count(s
, ccp
);
2442 if (*q
== ConfigAck
)
2443 change_state(s
, ccp
, AckSent
);
2445 change_state(s
, ccp
, RequestSent
);
2450 LOG(2, s
, t
, "CCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ccp
));
2454 LOG(4, s
, t
, "CCP: send %s\n", ppp_code(*q
));
2455 tunnelsend(b
, l
+ (q
- b
), t
);
2457 else if (*p
== TerminateReq
)
2460 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPCCP
, 0, 0, 0);
2462 LOG(3, s
, t
, "CCP: send %s\n", ppp_code(*q
));
2463 tunnelsend(b
, l
+ (q
- b
), t
);
2464 change_state(s
, ccp
, Stopped
);
2466 else if (*p
!= CodeRej
)
2468 ppp_code_rej(s
, t
, PPPCCP
, "CCP", p
, l
, b
, sizeof(b
));
2472 // send a CHAP challenge
2473 void sendchap(sessionidt s
, tunnelidt t
)
2475 uint8_t b
[MAXETHER
];
2484 LOG(1, s
, t
, "No RADIUS to send challenge\n");
2485 STAT(tunnel_tx_errors
);
2489 LOG(1, s
, t
, "Send CHAP challenge\n");
2491 radius
[r
].chap
= 1; // CHAP not PAP
2493 if (radius
[r
].state
!= RADIUSCHAP
)
2496 radius
[r
].state
= RADIUSCHAP
;
2497 radius
[r
].retry
= backoff(radius
[r
].try++);
2498 if (radius
[r
].try > 5)
2500 sessionshutdown(s
, "CHAP timeout.", CDN_ADMIN_DISC
, TERM_REAUTHENTICATION_FAILURE
);
2501 STAT(tunnel_tx_errors
);
2504 q
= makeppp(b
, sizeof(b
), 0, 0, s
, t
, PPPCHAP
, 0, 0, 0);
2507 *q
= 1; // challenge
2508 q
[1] = radius
[r
].id
; // ID
2509 q
[4] = 16; // value size (size of challenge)
2510 memcpy(q
+ 5, radius
[r
].auth
, 16); // challenge
2511 strcpy((char *) q
+ 21, hostname
); // our name
2512 *(uint16_t *) (q
+ 2) = htons(strlen(hostname
) + 21); // length
2513 tunnelsend(b
, strlen(hostname
) + 21 + (q
- b
), t
); // send it
2516 // fill in a L2TP message with a PPP frame,
2517 // returns start of PPP frame
2518 uint8_t *makeppp(uint8_t *b
, int size
, uint8_t *p
, int l
, sessionidt s
, tunnelidt t
, uint16_t mtype
, uint8_t prio
, bundleidt bid
, uint8_t mp_bits
)
2520 uint16_t hdr
= 0x0002; // L2TP with no options
2521 uint16_t type
= mtype
;
2524 if (size
< 16) // Need more space than this!!
2526 LOG(0, s
, t
, "makeppp buffer too small for L2TP header (size=%d)\n", size
);
2530 if (prio
) hdr
|= 0x0100; // set priority bit
2532 *(uint16_t *) (b
+ 0) = htons(hdr
);
2533 *(uint16_t *) (b
+ 2) = htons(tunnel
[t
].far
); // tunnel
2534 *(uint16_t *) (b
+ 4) = htons(session
[s
].far
); // session
2537 // Check whether this session is part of multilink
2540 if (bundle
[bid
].num_of_links
> 1)
2541 type
= PPPMP
; // Change PPP message type to the PPPMP
2546 if (type
== PPPLCP
|| !(session
[s
].flags
& SESSION_ACFC
))
2548 *(uint16_t *) b
= htons(0xFF03); // HDLC header
2552 if (type
< 0x100 && session
[s
].flags
& SESSION_PFC
)
2558 *(uint16_t *) b
= htons(type
);
2564 // Set the sequence number and (B)egin (E)nd flags
2565 if (session
[s
].mssf
)
2567 // Set the multilink bits
2568 uint16_t bits_send
= mp_bits
;
2569 *(uint16_t *) b
= htons((bundle
[bid
].seq_num_t
& 0x0FFF)|bits_send
);
2574 *(uint32_t *) b
= htonl(bundle
[bid
].seq_num_t
);
2575 // Set the multilink bits
2580 bundle
[bid
].seq_num_t
++;
2582 // Add the message type if this fragment has the begin bit set
2583 if (mp_bits
& MP_BEGIN
)
2585 //*b++ = mtype; // The next two lines are instead of this
2586 *(uint16_t *) b
= htons(mtype
); // Message type
2591 if ((b
- start
) + l
> size
)
2593 LOG(2, s
, t
, "makeppp would overflow buffer (size=%d, header+payload=%td)\n", size
, (b
- start
) + l
);
2604 static int add_lcp_auth(uint8_t *b
, int size
, int authtype
)
2607 if ((authtype
== AUTHCHAP
&& size
< 5) || size
< 4)
2610 *b
++ = 3; // Authentication-Protocol
2611 if (authtype
== AUTHCHAP
)
2613 len
= *b
++ = 5; // length
2614 *(uint16_t *) b
= htons(PPPCHAP
); b
+= 2;
2617 else if (authtype
== AUTHPAP
)
2619 len
= *b
++ = 4; // length
2620 *(uint16_t *) b
= htons(PPPPAP
); b
+= 2;
2624 LOG(0, 0, 0, "add_lcp_auth called with unsupported auth type %d\n", authtype
);
2630 // Send LCP ConfigReq for MRU, authentication type and magic no
2631 void sendlcp(sessionidt s
, tunnelidt t
)
2633 uint8_t b
[500], *q
, *l
;
2634 int authtype
= sess_local
[s
].lcp_authtype
;
2636 if (!(q
= makeppp(b
, sizeof(b
), NULL
, 0, s
, t
, PPPLCP
, 0, 0, 0)))
2639 LOG(3, s
, t
, "LCP: send ConfigReq%s%s%s including MP options\n",
2640 authtype
? " (" : "",
2641 authtype
? (authtype
== AUTHCHAP
? "CHAP" : "PAP") : "",
2642 authtype
? ")" : "");
2646 *l
++ = ++sess_local
[s
].lcp_ident
; // ID
2648 l
+= 2; //Save space for length
2650 if (sess_local
[s
].ppp_mru
)
2652 *l
++ = 1; *l
++ = 4; // Maximum-Receive-Unit (length 4)
2653 *(uint16_t *) l
= htons(sess_local
[s
].ppp_mru
); l
+= 2;
2657 l
+= add_lcp_auth(l
, sizeof(b
) - (l
- b
), authtype
);
2659 if (session
[s
].magic
)
2661 *l
++ = 5; *l
++ = 6; // Magic-Number (length 6)
2662 *(uint32_t *) l
= htonl(session
[s
].magic
);
2666 if (sess_local
[s
].mp_mrru
)
2668 *l
++ = 17; *l
++ = 4; // Multilink Max-Receive-Reconstructed-Unit (length 4)
2669 *(uint16_t *) l
= htons(sess_local
[s
].mp_mrru
); l
+= 2;
2672 if (sess_local
[s
].mp_epdis
)
2674 *l
++ = 19; *l
++ = 7; // Multilink Endpoint Discriminator (length 7)
2675 *l
++ = IPADDR
; // Endpoint Discriminator class
2676 *(uint32_t *) l
= htonl(sess_local
[s
].mp_epdis
);
2680 *(uint16_t *)(q
+ 2) = htons(l
- q
); // Length
2682 LOG_HEX(5, "PPPLCP", q
, l
- q
);
2683 if (config
->debug
> 3) dumplcp(q
, l
- q
);
2685 tunnelsend(b
, (l
- b
), t
);
2686 restart_timer(s
, lcp
);
2689 // Send CCP request for no compression
2690 void sendccp(sessionidt s
, tunnelidt t
)
2694 if (!(q
= makeppp(b
, sizeof(b
), NULL
, 0, s
, t
, PPPCCP
, 0, 0, 0)))
2697 LOG(3, s
, t
, "CCP: send ConfigReq (no compression)\n");
2700 *(q
+ 1) = ++sess_local
[s
].lcp_ident
; // ID
2701 *(uint16_t *)(q
+ 2) = htons(4); // Length
2703 LOG_HEX(5, "PPPCCP", q
, 4);
2704 tunnelsend(b
, (q
- b
) + 4 , t
);
2705 restart_timer(s
, ccp
);
2708 // Reject unknown/unconfigured protocols
2709 void protoreject(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
, uint16_t proto
)
2712 uint8_t buf
[MAXETHER
];
2714 int mru
= session
[s
].mru
;
2715 if (mru
< MINMTU
) mru
= MINMTU
;
2716 if (mru
> sizeof(buf
)) mru
= sizeof(buf
);
2719 if (l
> mru
) l
= mru
;
2721 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPLCP
, 0, 0, 0);
2725 *(q
+ 1) = ++sess_local
[s
].lcp_ident
;
2726 *(uint16_t *)(q
+ 2) = htons(l
);
2727 *(uint16_t *)(q
+ 4) = htons(proto
);
2728 memcpy(q
+ 6, p
, l
- 6);
2730 if (proto
== PPPIPV6CP
)
2731 LOG(3, s
, t
, "LCP: send ProtocolRej (IPV6CP: not configured)\n");
2733 LOG(2, s
, t
, "LCP: sent ProtocolRej (0x%04X: unsupported)\n", proto
);
2735 tunnelsend(buf
, l
+ (q
- buf
), t
);