8 #include <linux/rtnetlink.h>
9 #include <netinet/ip6.h>
13 #include "constants.h"
22 extern tunnelt
*tunnel
;
23 extern bundlet
*bundle
;
24 extern fragmentationt
*frag
;
25 extern sessiont
*session
;
26 extern radiust
*radius
;
28 extern char hostname
[];
29 extern uint32_t eth_tx
;
30 extern time_t time_now
;
31 extern uint64_t time_now_ms
;
32 extern configt
*config
;
34 static int add_lcp_auth(uint8_t *b
, int size
, int authtype
);
35 static bundleidt
new_bundle(void);
36 static int epdiscmp(epdist
, epdist
);
37 static void setepdis(epdist
*, epdist
);
38 static void ipcp_open(sessionidt s
, tunnelidt t
);
40 static int first_session_in_bundle(sessionidt s
)
43 for (i
= 1; i
< MAXBUNDLE
; i
++)
44 if (bundle
[i
].state
!= BUNDLEFREE
)
45 if (epdiscmp(session
[s
].epdis
,bundle
[i
].epdis
) && !strcmp(session
[s
].user
, bundle
[i
].user
))
50 // Process PAP messages
51 void processpap(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
60 LOG_HEX(5, "PAP", p
, l
);
63 LOG(1, s
, t
, "Short PAP %u bytes\n", l
);
64 STAT(tunnel_rx_errors
);
65 sessionshutdown(s
, "Short PAP packet.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
69 if ((hl
= ntohs(*(uint16_t *) (p
+ 2))) > l
)
71 LOG(1, s
, t
, "Length mismatch PAP %u/%u\n", hl
, l
);
72 STAT(tunnel_rx_errors
);
73 sessionshutdown(s
, "PAP length mismatch.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
80 LOG(1, s
, t
, "Unexpected PAP code %d\n", *p
);
81 STAT(tunnel_rx_errors
);
82 sessionshutdown(s
, "Unexpected PAP code.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
86 if (session
[s
].ppp
.phase
!= Authenticate
)
88 LOG(2, s
, t
, "PAP ignored in %s phase\n", ppp_phase(session
[s
].ppp
.phase
));
95 user
[0] = pass
[0] = 0;
96 if (*b
&& *b
< sizeof(user
))
98 memcpy(user
, b
+ 1, *b
);
101 if (*b
&& *b
< sizeof(pass
))
103 memcpy(pass
, b
+ 1, *b
);
107 LOG(3, s
, t
, "PAP login %s/%s\n", user
, pass
);
110 if ((!config
->disable_lac_func
) && lac_conf_forwardtoremotelns(s
, user
))
112 // Creating a tunnel/session has been started
116 if (session
[s
].ip
|| !(r
= radiusnew(s
)))
118 // respond now, either no RADIUS available or already authenticated
121 uint8_t *p
= makeppp(b
, sizeof(b
), 0, 0, s
, t
, PPPPAP
, 0, 0, 0);
127 *p
= 3; // cant authorise
129 *(uint16_t *) (p
+ 2) = htons(5); // length
130 p
[4] = 0; // no message
131 tunnelsend(b
, 5 + (p
- b
), t
); // send it
135 LOG(3, s
, t
, "Already an IP allocated: %s (%d)\n",
136 fmtaddr(htonl(session
[s
].ip
), 0), session
[s
].ip_pool_index
);
140 LOG(1, s
, t
, "No RADIUS session available to authenticate session...\n");
141 sessionshutdown(s
, "No free RADIUS sessions.", CDN_UNAVAILABLE
, TERM_SERVICE_UNAVAILABLE
);
146 // Run PRE_AUTH plugins
147 struct param_pre_auth packet
= { &tunnel
[t
], &session
[s
], strdup(user
), strdup(pass
), PPPPAP
, 1 };
148 run_plugins(PLUGIN_PRE_AUTH
, &packet
);
149 if (!packet
.continue_auth
)
151 LOG(3, s
, t
, "A plugin rejected PRE_AUTH\n");
152 if (packet
.username
) free(packet
.username
);
153 if (packet
.password
) free(packet
.password
);
157 strncpy(session
[s
].user
, packet
.username
, sizeof(session
[s
].user
) - 1);
158 strncpy(radius
[r
].pass
, packet
.password
, sizeof(radius
[r
].pass
) - 1);
160 free(packet
.username
);
161 free(packet
.password
);
164 LOG(3, s
, t
, "Sending login for %s/%s to RADIUS\n", user
, pass
);
165 if ((session
[s
].mrru
) && (!first_session_in_bundle(s
)))
166 radiussend(r
, RADIUSJUSTAUTH
);
168 radiussend(r
, RADIUSAUTH
);
172 // Process CHAP messages
173 void processchap(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
180 LOG_HEX(5, "CHAP", p
, l
);
184 LOG(1, s
, t
, "Short CHAP %u bytes\n", l
);
185 STAT(tunnel_rx_errors
);
186 sessionshutdown(s
, "Short CHAP packet.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
190 if ((hl
= ntohs(*(uint16_t *) (p
+ 2))) > l
)
192 LOG(1, s
, t
, "Length mismatch CHAP %u/%u\n", hl
, l
);
193 STAT(tunnel_rx_errors
);
194 sessionshutdown(s
, "CHAP length mismatch.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
201 LOG(1, s
, t
, "Unexpected CHAP response code %d\n", *p
);
202 STAT(tunnel_rx_errors
);
203 sessionshutdown(s
, "CHAP length mismatch.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
207 if (session
[s
].ppp
.phase
!= Authenticate
)
209 LOG(2, s
, t
, "CHAP ignored in %s phase\n", ppp_phase(session
[s
].ppp
.phase
));
213 r
= sess_local
[s
].radius
;
216 LOG(3, s
, t
, "Unexpected CHAP message\n");
218 // Some modems (Netgear DM602, possibly others) persist in using CHAP even
219 // after ACKing our ConfigReq for PAP.
220 if (sess_local
[s
].lcp_authtype
== AUTHPAP
&& config
->radius_authtypes
& AUTHCHAP
)
222 sess_local
[s
].lcp_authtype
= AUTHCHAP
;
228 if (p
[1] != radius
[r
].id
)
230 LOG(1, s
, t
, "Wrong CHAP response ID %d (should be %d) (%d)\n", p
[1], radius
[r
].id
, r
);
231 STAT(tunnel_rx_errors
);
232 sessionshutdown(s
, "Unexpected CHAP response ID.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
236 if (l
< 5 || p
[4] != 16)
238 LOG(1, s
, t
, "Bad CHAP response length %d\n", l
< 5 ? -1 : p
[4]);
239 STAT(tunnel_rx_errors
);
240 sessionshutdown(s
, "Bad CHAP response length.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
246 if (l
< 16 || l
- 16 >= sizeof(session
[s
].user
))
248 LOG(1, s
, t
, "CHAP user too long %d\n", l
- 16);
249 STAT(tunnel_rx_errors
);
250 sessionshutdown(s
, "CHAP username too long.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
254 // Run PRE_AUTH plugins
256 struct param_pre_auth packet
= { &tunnel
[t
], &session
[s
], NULL
, NULL
, PPPCHAP
, 1 };
258 packet
.password
= calloc(17, 1);
259 memcpy(packet
.password
, p
, 16);
264 packet
.username
= calloc(l
+ 1, 1);
265 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
275 run_plugins(PLUGIN_PRE_AUTH
, &packet
);
276 if (!packet
.continue_auth
)
278 LOG(3, s
, t
, "A plugin rejected PRE_AUTH\n");
279 if (packet
.username
) free(packet
.username
);
280 if (packet
.password
) free(packet
.password
);
284 strncpy(session
[s
].user
, packet
.username
, sizeof(session
[s
].user
) - 1);
285 memcpy(radius
[r
].pass
, packet
.password
, 16);
287 free(packet
.username
);
288 free(packet
.password
);
292 LOG(3, s
, t
, "CHAP login %s\n", session
[s
].user
);
293 if ((session
[s
].mrru
) && (!first_session_in_bundle(s
)))
294 radiussend(r
, RADIUSJUSTAUTH
);
296 radiussend(r
, RADIUSAUTH
);
299 static void dumplcp(uint8_t *p
, int l
)
302 uint8_t *o
= (p
+ 4);
304 LOG_HEX(5, "PPP LCP Packet", p
, l
);
305 LOG(4, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p
, ppp_code((int)*p
), ntohs( ((uint16_t *) p
)[1]) );
306 LOG(4, 0, 0, "Length: %d\n", l
);
307 if (*p
!= ConfigReq
&& *p
!= ConfigRej
&& *p
!= ConfigAck
)
316 LOG(4, 0, 0, " Option length is %d...\n", length
);
321 LOG(4, 0, 0, " Option type is 0...\n");
328 case 1: // Maximum-Receive-Unit
330 LOG(4, 0, 0, " %s %d\n", ppp_lcp_option(type
), ntohs(*(uint16_t *)(o
+ 2)));
332 LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type
), length
);
334 case 2: // Async-Control-Character-Map
337 uint32_t asyncmap
= ntohl(*(uint32_t *)(o
+ 2));
338 LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type
), asyncmap
);
341 LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type
), length
);
343 case 3: // Authentication-Protocol
346 int proto
= ntohs(*(uint16_t *)(o
+ 2));
347 LOG(4, 0, 0, " %s 0x%x (%s)\n", ppp_lcp_option(type
), proto
,
348 proto
== PPPPAP
? "PAP" : "UNSUPPORTED");
350 else if (length
== 5)
352 int proto
= ntohs(*(uint16_t *)(o
+ 2));
354 LOG(4, 0, 0, " %s 0x%x 0x%x (%s)\n", ppp_lcp_option(type
), proto
, algo
,
355 (proto
== PPPCHAP
&& algo
== 5) ? "CHAP MD5" : "UNSUPPORTED");
358 LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type
), length
);
360 case 4: // Quality-Protocol
362 uint32_t qp
= ntohl(*(uint32_t *)(o
+ 2));
363 LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type
), qp
);
366 case 5: // Magic-Number
369 uint32_t magicno
= ntohl(*(uint32_t *)(o
+ 2));
370 LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type
), magicno
);
373 LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type
), length
);
375 case 7: // Protocol-Field-Compression
376 case 8: // Address-And-Control-Field-Compression
377 LOG(4, 0, 0, " %s\n", ppp_lcp_option(type
));
380 LOG(2, 0, 0, " Unknown PPP LCP Option type %d\n", type
);
388 void lcp_open(sessionidt s
, tunnelidt t
)
390 // transition to Authentication or Network phase:
391 session
[s
].ppp
.phase
= sess_local
[s
].lcp_authtype
? Authenticate
: Network
;
393 LOG(3, s
, t
, "LCP: Opened, phase %s\n", ppp_phase(session
[s
].ppp
.phase
));
396 change_state(s
, lcp
, Opened
);
398 if (session
[s
].ppp
.phase
== Authenticate
)
400 if (sess_local
[s
].lcp_authtype
== AUTHCHAP
)
405 if(session
[s
].bundle
== 0 || bundle
[session
[s
].bundle
].num_of_links
== 1)
409 change_state(s
, ipcp
, RequestSent
);
410 // move to passive state for IPv6 (if configured), CCP
411 if (config
->ipv6_prefix
.s6_addr
[0])
412 change_state(s
, ipv6cp
, Stopped
);
414 change_state(s
, ipv6cp
, Closed
);
416 change_state(s
, ccp
, Stopped
);
420 sessionidt first_ses
= bundle
[session
[s
].bundle
].members
[0];
421 LOG(3, s
, t
, "MPPP: Skipping IPCP negotiation for session:%d, first session of bundle is:%d\n",s
,first_ses
);
427 void lcp_restart(sessionidt s
)
429 session
[s
].ppp
.phase
= Establish
;
431 change_state(s
, ipcp
, Dead
);
432 change_state(s
, ipv6cp
, Dead
);
433 change_state(s
, ccp
, Dead
);
436 static uint8_t *ppp_conf_rej(sessionidt s
, uint8_t *buf
, size_t blen
, uint16_t mtype
,
437 uint8_t **response
, uint8_t *queued
, uint8_t *packet
, uint8_t *option
)
439 if (!*response
|| **response
!= ConfigRej
)
441 queued
= *response
= makeppp(buf
, blen
, packet
, 2, s
, session
[s
].tunnel
, mtype
, 0, 0, 0);
449 if ((queued
- buf
+ option
[1]) > blen
)
451 LOG(2, s
, session
[s
].tunnel
, "PPP overflow for ConfigRej (proto %u, option %u).\n", mtype
, *option
);
455 memcpy(queued
, option
, option
[1]);
456 return queued
+ option
[1];
459 static uint8_t *ppp_conf_nak(sessionidt s
, uint8_t *buf
, size_t blen
, uint16_t mtype
,
460 uint8_t **response
, uint8_t *queued
, uint8_t *packet
, uint8_t *option
,
461 uint8_t *value
, size_t vlen
)
466 case PPPLCP
: nak_sent
= &sess_local
[s
].lcp
.nak_sent
; break;
467 case PPPIPCP
: nak_sent
= &sess_local
[s
].ipcp
.nak_sent
; break;
468 case PPPIPV6CP
: nak_sent
= &sess_local
[s
].ipv6cp
.nak_sent
; break;
469 default: return 0; // ?
472 if (*response
&& **response
!= ConfigNak
)
474 if (*nak_sent
< config
->ppp_max_failure
) // reject queued
477 return ppp_conf_rej(s
, buf
, blen
, mtype
, response
, 0, packet
, option
);
482 if (*nak_sent
>= config
->ppp_max_failure
)
483 return ppp_conf_rej(s
, buf
, blen
, mtype
, response
, 0, packet
, option
);
485 queued
= *response
= makeppp(buf
, blen
, packet
, 2, s
, session
[s
].tunnel
, mtype
, 0, 0, 0);
494 if ((queued
- buf
+ vlen
+ 2) > blen
)
496 LOG(2, s
, session
[s
].tunnel
, "PPP overflow for ConfigNak (proto %u, option %u).\n", mtype
, *option
);
501 *queued
++ = vlen
+ 2;
502 memcpy(queued
, value
, vlen
);
503 return queued
+ vlen
;
506 static void ppp_code_rej(sessionidt s
, tunnelidt t
, uint16_t proto
,
507 char *pname
, uint8_t *p
, uint16_t l
, uint8_t *buf
, size_t size
)
510 int mru
= session
[s
].mru
;
511 if (mru
< MINMTU
) mru
= MINMTU
;
512 if (mru
> size
) mru
= size
;
515 if (l
> mru
) l
= mru
;
517 q
= makeppp(buf
, size
, 0, 0, s
, t
, proto
, 0, 0, 0);
521 *(q
+ 1) = ++sess_local
[s
].lcp_ident
;
522 *(uint16_t *)(q
+ 2) = htons(l
);
523 memcpy(q
+ 4, p
, l
- 4);
525 LOG(2, s
, t
, "Unexpected %s code %s\n", pname
, ppp_code(*p
));
526 LOG(3, s
, t
, "%s: send %s\n", pname
, ppp_code(*q
));
527 if (config
->debug
> 3) dumplcp(q
, l
);
529 tunnelsend(buf
, l
+ (q
- buf
), t
);
532 // Process LCP messages
533 void processlcp(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
541 LOG_HEX(5, "LCP", p
, l
);
544 LOG(1, s
, t
, "Short LCP %d bytes\n", l
);
545 STAT(tunnel_rx_errors
);
549 if ((hl
= ntohs(*(uint16_t *) (p
+ 2))) > l
)
551 LOG(1, s
, t
, "Length mismatch LCP %u/%u\n", hl
, l
);
552 STAT(tunnel_rx_errors
);
557 if (session
[s
].die
) // going down...
560 LOG(((*p
== EchoReq
|| *p
== EchoReply
) ? 4 : 3), s
, t
,
561 "LCP: recv %s\n", ppp_code(*p
));
563 if (config
->debug
> 3) dumplcp(p
, l
);
568 uint8_t *o
= (p
+ 4);
576 if (length
== 0 || type
== 0 || x
< length
) break;
579 case 3: // Authentication-Protocol
581 int proto
= ntohs(*(uint16_t *)(o
+ 2));
584 else if (proto
== PPPCHAP
&& *(o
+ 4) == 5)
594 if (!session
[s
].ip
&& authtype
)
595 sess_local
[s
].lcp_authtype
= authtype
;
597 switch (session
[s
].ppp
.lcp
)
600 initialise_restart_count(s
, lcp
);
601 change_state(s
, lcp
, AckReceived
);
606 LOG(2, s
, t
, "LCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session
[s
].ppp
.lcp
));
607 if (session
[s
].ppp
.lcp
== Opened
)
611 change_state(s
, lcp
, RequestSent
);
619 LOG(2, s
, t
, "LCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.lcp
));
622 else if (*p
== ConfigReq
)
625 uint8_t *o
= (p
+ 4);
626 uint8_t *response
= 0;
627 static uint8_t asyncmap
[4] = { 0, 0, 0, 0 }; // all zero
628 static uint8_t authproto
[5];
636 if (length
== 0 || type
== 0 || x
< length
) break;
639 case 1: // Maximum-Receive-Unit
641 uint16_t mru
= ntohs(*(uint16_t *)(o
+ 2));
644 session
[s
].mru
= mru
;
649 LOG(3, s
, t
, " Remote requesting MRU of %u. Rejecting.\n", mru
);
651 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPLCP
, &response
, q
, p
, o
, (uint8_t *) &mru
, sizeof(mru
));
655 case 2: // Async-Control-Character-Map
656 if (!ntohl(*(uint32_t *)(o
+ 2))) // all bits zero is OK
659 LOG(3, s
, t
, " Remote requesting asyncmap. Rejecting.\n");
660 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPLCP
, &response
, q
, p
, o
, asyncmap
, sizeof(asyncmap
));
663 case 3: // Authentication-Protocol
665 int proto
= ntohs(*(uint16_t *)(o
+ 2));
666 char proto_name
[] = "0x0000";
671 if (config
->radius_authtypes
& AUTHPAP
)
673 sess_local
[s
].lcp_authtype
= AUTHPAP
;
677 strcpy(proto_name
, "PAP");
679 else if (proto
== PPPCHAP
)
681 if (config
->radius_authtypes
& AUTHCHAP
682 && *(o
+ 4) == 5) // MD5
684 sess_local
[s
].lcp_authtype
= AUTHCHAP
;
688 strcpy(proto_name
, "CHAP");
691 sprintf(proto_name
, "%#4.4x", proto
);
693 LOG(3, s
, t
, " Remote requesting %s authentication. Rejecting.\n", proto_name
);
695 alen
= add_lcp_auth(authproto
, sizeof(authproto
), config
->radius_authprefer
);
696 if (alen
< 2) break; // paranoia
698 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPLCP
, &response
, q
, p
, o
, authproto
+ 2, alen
- 2);
699 if (q
&& *response
== ConfigNak
&&
700 config
->radius_authtypes
!= config
->radius_authprefer
)
703 alen
= add_lcp_auth(authproto
, sizeof(authproto
), config
->radius_authtypes
& ~config
->radius_authprefer
);
705 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPLCP
, &response
, q
, p
, o
, authproto
+ 2, alen
- 2);
712 case 4: // Quality-Protocol
713 case 5: // Magic-Number
714 case 7: // Protocol-Field-Compression
715 case 8: // Address-And-Control-Field-Compression
718 case 17: // Multilink Max-Receive-Reconstructed-Unit
720 uint16_t mrru
= ntohs(*(uint16_t *)(o
+ 2));
721 session
[s
].mrru
= mrru
;
723 LOG(3, s
, t
, " Received PPP LCP option MRRU: %d\n",mrru
);
727 case 18: // Multilink Short Sequence Number Header Format
731 LOG(3, s
, t
, " Received PPP LCP option MSSN format\n");
735 case 19: // Multilink Endpoint Discriminator
737 uint8_t epdis_class
= o
[2];
740 session
[s
].epdis
.addr_class
= epdis_class
;
741 session
[s
].epdis
.length
= length
- 3;
742 if (session
[s
].epdis
.length
> 20)
744 LOG(1, s
, t
, "Error: received EndDis Address Length more than 20: %d\n", session
[s
].epdis
.length
);
745 session
[s
].epdis
.length
= 20;
748 for (addr
= 0; addr
< session
[s
].epdis
.length
; addr
++)
749 session
[s
].epdis
.address
[addr
] = o
[3+addr
];
756 LOG(3, s
, t
, " Received PPP LCP option Multilink EndDis Local Address Class: %d\n",epdis_class
);
759 LOG(3, s
, t
, " Received PPP LCP option Multilink EndDis IP Address Class: %d\n",epdis_class
);
762 LOG(3, s
, t
, " Received PPP LCP option Multilink EndDis IEEE MAC Address Class: %d\n",epdis_class
);
765 LOG(3, s
, t
, " Received PPP LCP option Multilink EndDis PPP Magic No Class: %d\n",epdis_class
);
768 LOG(3, s
, t
, " Received PPP LCP option Multilink EndDis PSND No Class: %d\n",epdis_class
);
771 LOG(3, s
, t
, " Received PPP LCP option Multilink EndDis NULL Class %d\n",epdis_class
);
776 default: // Reject any unknown options
777 LOG(3, s
, t
, " Rejecting unknown PPP LCP option %d\n", type
);
778 q
= ppp_conf_rej(s
, b
, sizeof(b
), PPPLCP
, &response
, q
, p
, o
);
785 cluster_send_session(s
);
789 l
= q
- response
; // LCP packet length
790 *((uint16_t *) (response
+ 2)) = htons(l
); // update header
794 // Send packet back as ConfigAck
795 response
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPLCP
, 0, 0, 0);
796 if (!response
) return;
797 *response
= ConfigAck
;
800 switch (session
[s
].ppp
.lcp
)
803 response
= makeppp(b
, sizeof(b
), p
, 2, s
, t
, PPPLCP
, 0, 0, 0);
804 if (!response
) return;
805 *response
= TerminateAck
;
806 *((uint16_t *) (response
+ 2)) = htons(l
= 4);
810 initialise_restart_count(s
, lcp
);
812 if (*response
== ConfigAck
)
813 change_state(s
, lcp
, AckSent
);
815 change_state(s
, lcp
, RequestSent
);
820 if (*response
== ConfigAck
)
821 change_state(s
, lcp
, AckSent
);
826 if (*response
== ConfigAck
)
837 if (*response
== ConfigAck
)
838 change_state(s
, lcp
, AckSent
);
840 change_state(s
, lcp
, RequestSent
);
845 sessionshutdown(s
, "LCP: ConfigReq in state Closing. This should not happen. Killing session.", CDN_ADMIN_DISC
, TERM_LOST_SERVICE
);
849 LOG(2, s
, t
, "LCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.lcp
));
853 LOG(3, s
, t
, "LCP: send %s\n", ppp_code(*response
));
854 if (config
->debug
> 3) dumplcp(response
, l
);
856 tunnelsend(b
, l
+ (response
- b
), t
);
858 else if (*p
== ConfigNak
|| *p
== ConfigRej
)
861 uint8_t *o
= (p
+ 4);
869 if (length
== 0 || type
== 0 || x
< length
) break;
872 case 1: // Maximum-Receive-Unit
875 if (length
< 4) break;
876 sess_local
[s
].ppp_mru
= ntohs(*(uint16_t *)(o
+ 2));
877 LOG(3, s
, t
, " Remote requested MRU of %u\n", sess_local
[s
].ppp_mru
);
881 sess_local
[s
].ppp_mru
= 0;
882 LOG(3, s
, t
, " Remote rejected MRU negotiation\n");
887 case 3: // Authentication-Protocol
895 if (length
< 4) break;
896 proto
= ntohs(*(uint16_t *)(o
+ 2));
900 authtype
= config
->radius_authtypes
& AUTHPAP
;
901 LOG(3, s
, t
, " Remote requested PAP authentication...%sing\n",
902 authtype
? "accept" : "reject");
904 else if (proto
== PPPCHAP
&& length
> 4 && *(o
+ 4) == 5)
906 authtype
= config
->radius_authtypes
& AUTHCHAP
;
907 LOG(3, s
, t
, " Remote requested CHAP authentication...%sing\n",
908 authtype
? "accept" : "reject");
912 LOG(3, s
, t
, " Rejecting unsupported authentication %#4x\n",
918 LOG(2, s
, t
, "LCP: remote rejected auth negotiation\n");
919 authtype
= 0; // shutdown
924 case 5: // Magic-Number
925 session
[s
].magic
= 0;
928 if (length
< 6) break;
929 session
[s
].magic
= ntohl(*(uint32_t *)(o
+ 2));
932 if (session
[s
].magic
)
933 LOG(3, s
, t
, " Remote requested magic-no %x\n", session
[s
].magic
);
935 LOG(3, s
, t
, " Remote rejected magic-no\n");
937 cluster_send_session(s
);
940 case 17: // Multilink Max-Receive-Reconstructed-Unit
944 sess_local
[s
].mp_mrru
= ntohs(*(uint16_t *)(o
+ 2));
945 LOG(3, s
, t
, " Remote requested MRRU of %u\n", sess_local
[s
].mp_mrru
);
949 sess_local
[s
].mp_mrru
= 0;
950 LOG(3, s
, t
, " Remote rejected MRRU negotiation\n");
955 case 18: // Multilink Short Sequence Number Header Format
959 sess_local
[s
].mp_mssf
= 0;
960 LOG(3, s
, t
, " Remote requested Naked mssf\n");
964 sess_local
[s
].mp_mssf
= 0;
965 LOG(3, s
, t
, " Remote rejected mssf\n");
970 case 19: // Multilink Endpoint Discriminator
974 LOG(2, s
, t
, " Remote should not configNak Endpoint Dis!\n");
978 sess_local
[s
].mp_epdis
= 0;
979 LOG(3, s
, t
, " Remote rejected Endpoint Discriminator\n");
985 LOG(2, s
, t
, "LCP: remote sent %s for type %u?\n", ppp_code(*p
), type
);
986 sessionshutdown(s
, "Unable to negotiate LCP.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
995 sessionshutdown(s
, "Unsupported authentication.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
1000 sess_local
[s
].lcp_authtype
= authtype
;
1002 switch (session
[s
].ppp
.lcp
)
1007 uint8_t *response
= makeppp(b
, sizeof(b
), p
, 2, s
, t
, PPPLCP
, 0, 0, 0);
1008 if (!response
) return;
1009 *response
= TerminateAck
;
1010 *((uint16_t *) (response
+ 2)) = htons(l
= 4);
1012 LOG(3, s
, t
, "LCP: send %s\n", ppp_code(*response
));
1013 if (config
->debug
> 3) dumplcp(response
, l
);
1015 tunnelsend(b
, l
+ (response
- b
), t
);
1021 initialise_restart_count(s
, lcp
);
1026 LOG(2, s
, t
, "LCP: ConfigNak in state %s? Sending ConfigReq\n", ppp_state(session
[s
].ppp
.lcp
));
1036 LOG(2, s
, t
, "LCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.lcp
));
1040 else if (*p
== TerminateReq
)
1042 switch (session
[s
].ppp
.lcp
)
1055 zero_restart_count(s
, lcp
);
1056 change_state(s
, lcp
, Closing
);
1060 LOG(2, s
, t
, "LCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.lcp
));
1064 *p
= TerminateAck
; // send ack
1065 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPLCP
, 0, 0, 0);
1068 LOG(3, s
, t
, "LCP: send %s\n", ppp_code(*q
));
1069 if (config
->debug
> 3) dumplcp(q
, l
);
1071 tunnelsend(b
, l
+ (q
- b
), t
); // send it
1073 else if (*p
== ProtocolRej
)
1080 if (l
> 5 && !(proto
& 1))
1087 if (proto
== PPPIPV6CP
)
1089 LOG(3, s
, t
, "IPv6 rejected\n");
1090 change_state(s
, ipv6cp
, Closed
);
1094 LOG(3, s
, t
, "LCP protocol reject: 0x%04X\n", proto
);
1097 else if (*p
== EchoReq
)
1099 *p
= EchoReply
; // reply
1100 *(uint32_t *) (p
+ 4) = htonl(session
[s
].magic
); // our magic number
1101 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPLCP
, 0, 0, 0);
1104 LOG(4, s
, t
, "LCP: send %s\n", ppp_code(*q
));
1105 if (config
->debug
> 3) dumplcp(q
, l
);
1107 tunnelsend(b
, l
+ (q
- b
), t
); // send it
1109 else if (*p
== EchoReply
)
1111 // Ignore it, last_packet time is set earlier than this.
1113 else if (*p
!= CodeRej
)
1115 ppp_code_rej(s
, t
, PPPLCP
, "LCP", p
, l
, b
, sizeof(b
));
1119 int join_bundle(sessionidt s
)
1121 // Search for a bundle to join
1124 for (i
= 1; i
< MAXBUNDLE
; i
++)
1126 if (bundle
[i
].state
!= BUNDLEFREE
)
1128 if (epdiscmp(session
[s
].epdis
,bundle
[i
].epdis
) && !strcmp(session
[s
].user
, bundle
[i
].user
))
1130 sessionidt first_ses
= bundle
[i
].members
[0];
1131 if (bundle
[i
].mssf
!= session
[s
].mssf
)
1133 // uniformity of sequence number format must be insured
1134 LOG(3, s
, session
[s
].tunnel
, "MPPP: unable to bundle session %d in bundle %d cause of different mssf\n", s
, i
);
1137 session
[s
].bundle
= i
;
1138 session
[s
].ip
= session
[first_ses
].ip
;
1139 session
[s
].dns1
= session
[first_ses
].dns1
;
1140 session
[s
].dns2
= session
[first_ses
].dns2
;
1141 session
[s
].timeout
= session
[first_ses
].timeout
;
1143 if(session
[s
].epdis
.length
> 0)
1144 setepdis(&bundle
[i
].epdis
, session
[s
].epdis
);
1146 strcpy(bundle
[i
].user
, session
[s
].user
);
1147 bundle
[i
].members
[bundle
[i
].num_of_links
] = s
;
1148 bundle
[i
].num_of_links
++;
1149 LOG(3, s
, session
[s
].tunnel
, "MPPP: Bundling additional line in bundle (%d), lines:%d\n",i
,bundle
[i
].num_of_links
);
1155 // No previously created bundle was found for this session, so create a new one
1156 if (!(b
= new_bundle())) return 0;
1158 session
[s
].bundle
= b
;
1159 bundle
[b
].mrru
= session
[s
].mrru
;
1160 bundle
[b
].mssf
= session
[s
].mssf
;
1161 // FIXME !!! to enable l2tpns reading mssf frames receiver_max_seq, sender_max_seq must be introduce
1162 // 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
1165 bundle[b].max_seq = 1 << 12;
1167 bundle
[b
].max_seq
= 1 << 24;
1168 if(session
[s
].epdis
.length
> 0)
1169 setepdis(&bundle
[b
].epdis
, session
[s
].epdis
);
1171 strcpy(bundle
[b
].user
, session
[s
].user
);
1172 bundle
[b
].members
[0] = s
;
1173 bundle
[b
].timeout
= session
[s
].timeout
;
1174 LOG(3, s
, session
[s
].tunnel
, "MPPP: Created a new bundle (%d)\n", b
);
1178 static int epdiscmp(epdist ep1
, epdist ep2
)
1181 if (ep1
.length
!= ep2
.length
)
1184 if (ep1
.addr_class
!= ep2
.addr_class
)
1187 for (ad
= 0; ad
< ep1
.length
; ad
++)
1188 if (ep1
.address
[ad
] != ep2
.address
[ad
])
1194 static void setepdis(epdist
*ep1
, epdist ep2
)
1197 ep1
->length
= ep2
.length
;
1198 ep1
->addr_class
= ep2
.addr_class
;
1199 for (ad
= 0; ad
< ep2
.length
; ad
++)
1200 ep1
->address
[ad
] = ep2
.address
[ad
];
1203 static bundleidt
new_bundle()
1206 for (i
= 1; i
< MAXBUNDLE
; i
++)
1208 if (bundle
[i
].state
== BUNDLEFREE
)
1210 LOG(4, 0, 0, "MPPP: Assigning bundle ID %d\n", i
);
1211 bundle
[i
].num_of_links
= 1;
1212 bundle
[i
].last_check
= time_now
; // Initialize last_check value
1213 bundle
[i
].state
= BUNDLEOPEN
;
1214 bundle
[i
].current_ses
= -1; // This is to enforce the first session 0 to be used at first
1215 memset(&frag
[i
], 0, sizeof(fragmentationt
));
1216 if (i
> config
->cluster_highest_bundleid
)
1217 config
->cluster_highest_bundleid
= i
;
1221 LOG(0, 0, 0, "MPPP: Can't find a free bundle! There shouldn't be this many in use!\n");
1225 static void ipcp_open(sessionidt s
, tunnelidt t
)
1227 LOG(3, s
, t
, "IPCP: Opened, session is now active\n");
1229 change_state(s
, ipcp
, Opened
);
1231 if (!(session
[s
].walled_garden
|| session
[s
].flags
& SESSION_STARTED
))
1233 uint16_t r
= radiusnew(s
);
1236 radiussend(r
, RADIUSSTART
); // send radius start
1238 // don't send further Start records if IPCP is restarted
1239 session
[s
].flags
|= SESSION_STARTED
;
1240 cluster_send_session(s
);
1244 // start IPv6 if configured and still in passive state
1245 if (session
[s
].ppp
.ipv6cp
== Stopped
)
1248 change_state(s
, ipv6cp
, RequestSent
);
1252 // Process IPCP messages
1253 void processipcp(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
1255 uint8_t b
[MAXETHER
];
1261 LOG_HEX(5, "IPCP", p
, l
);
1264 LOG(1, s
, t
, "Short IPCP %d bytes\n", l
);
1265 STAT(tunnel_rx_errors
);
1269 if ((hl
= ntohs(*(uint16_t *) (p
+ 2))) > l
)
1271 LOG(1, s
, t
, "Length mismatch IPCP %u/%u\n", hl
, l
);
1272 STAT(tunnel_rx_errors
);
1277 if (session
[s
].ppp
.phase
< Network
)
1279 LOG(2, s
, t
, "IPCP %s ignored in %s phase\n", ppp_code(*p
), ppp_phase(session
[s
].ppp
.phase
));
1283 LOG(3, s
, t
, "IPCP: recv %s\n", ppp_code(*p
));
1285 if (*p
== ConfigAck
)
1287 switch (session
[s
].ppp
.ipcp
)
1290 initialise_restart_count(s
, ipcp
);
1291 change_state(s
, ipcp
, AckReceived
);
1296 LOG(2, s
, t
, "IPCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session
[s
].ppp
.ipcp
));
1298 change_state(s
, ipcp
, RequestSent
);
1306 LOG(2, s
, t
, "IPCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ipcp
));
1309 else if (*p
== ConfigReq
)
1311 uint8_t *response
= 0;
1319 if (!o
[1] || o
[1] > length
) return;
1323 case 3: // ip address
1324 gotip
++; // seen address
1325 if (o
[1] != 6) return;
1327 addr
= htonl(session
[s
].ip
);
1328 if (memcmp(o
+ 2, &addr
, (sizeof addr
)))
1331 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPIPCP
, &response
, q
, p
, o
, (uint8_t *) &addr
, sizeof(addr
));
1332 if (!q
|| (q
!= oq
&& *response
== ConfigRej
))
1334 sessionshutdown(s
, "Can't negotiate IPCP.", CDN_ADMIN_DISC
, TERM_USER_ERROR
);
1341 case 129: // primary DNS
1342 if (o
[1] != 6) return;
1344 addr
= htonl(session
[s
].dns1
);
1345 if (memcmp(o
+ 2, &addr
, (sizeof addr
)))
1347 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPIPCP
, &response
, q
, p
, o
, (uint8_t *) &addr
, sizeof(addr
));
1353 case 131: // secondary DNS
1354 if (o
[1] != 6) return;
1356 addr
= htonl(session
[s
].dns2
);
1357 if (memcmp(o
+ 2, &addr
, sizeof(addr
)))
1359 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPIPCP
, &response
, q
, p
, o
, (uint8_t *) &addr
, sizeof(addr
));
1366 LOG(2, s
, t
, " Rejecting PPP IPCP Option type %d\n", *o
);
1367 q
= ppp_conf_rej(s
, b
, sizeof(b
), PPPIPCP
, &response
, q
, p
, o
);
1377 l
= q
- response
; // IPCP packet length
1378 *((uint16_t *) (response
+ 2)) = htons(l
); // update header
1382 // Send packet back as ConfigAck
1383 response
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPIPCP
, 0, 0, 0);
1384 if (!response
) return;
1385 *response
= ConfigAck
;
1389 LOG(1, s
, t
, "No IP in IPCP request\n");
1390 STAT(tunnel_rx_errors
);
1394 switch (session
[s
].ppp
.ipcp
)
1397 response
= makeppp(b
, sizeof(b
), p
, 2, s
, t
, PPPIPCP
, 0, 0, 0);
1398 if (!response
) return;
1399 *response
= TerminateAck
;
1400 *((uint16_t *) (response
+ 2)) = htons(l
= 4);
1404 initialise_restart_count(s
, ipcp
);
1406 if (*response
== ConfigAck
)
1407 change_state(s
, ipcp
, AckSent
);
1409 change_state(s
, ipcp
, RequestSent
);
1414 if (*response
== ConfigAck
)
1415 change_state(s
, ipcp
, AckSent
);
1420 if (*response
== ConfigAck
)
1426 initialise_restart_count(s
, ipcp
);
1431 if (*response
== ConfigAck
)
1432 change_state(s
, ipcp
, AckSent
);
1434 change_state(s
, ipcp
, RequestSent
);
1439 LOG(2, s
, t
, "IPCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ipcp
));
1443 LOG(3, s
, t
, "IPCP: send %s\n", ppp_code(*response
));
1444 tunnelsend(b
, l
+ (response
- b
), t
);
1446 else if (*p
== TerminateReq
)
1448 switch (session
[s
].ppp
.ipcp
)
1460 zero_restart_count(s
, ipcp
);
1461 change_state(s
, ipcp
, Closing
);
1465 LOG(2, s
, t
, "IPCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ipcp
));
1469 *p
= TerminateAck
; // send ack
1470 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPIPCP
, 0, 0, 0);
1473 LOG(3, s
, t
, "IPCP: send %s\n", ppp_code(*q
));
1474 tunnelsend(b
, l
+ (q
- b
), t
); // send it
1476 else if (*p
!= CodeRej
)
1478 ppp_code_rej(s
, t
, PPPIPCP
, "IPCP", p
, l
, b
, sizeof(b
));
1482 static void ipv6cp_open(sessionidt s
, tunnelidt t
)
1485 LOG(3, s
, t
, "IPV6CP: Opened\n");
1487 change_state(s
, ipv6cp
, Opened
);
1488 for (i
= 0; i
< MAXROUTE6
&& session
[s
].route6
[i
].ipv6prefixlen
; i
++)
1490 route6set(s
, session
[s
].route6
[i
].ipv6route
, session
[s
].route6
[i
].ipv6prefixlen
, 1);
1493 if (session
[s
].ipv6address
.s6_addr
[0])
1495 // Check if included in prefix
1496 if (sessionbyipv6(session
[s
].ipv6address
) != s
)
1497 route6set(s
, session
[s
].ipv6address
, 128, 1);
1500 // Send an initial RA (TODO: Should we send these regularly?)
1501 send_ipv6_ra(s
, t
, NULL
);
1504 // Process IPV6CP messages
1505 void processipv6cp(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
1507 uint8_t b
[MAXETHER
];
1511 CSTAT(processipv6cp
);
1513 LOG_HEX(5, "IPV6CP", p
, l
);
1516 LOG(1, s
, t
, "Short IPV6CP %d bytes\n", l
);
1517 STAT(tunnel_rx_errors
);
1521 if ((hl
= ntohs(*(uint16_t *) (p
+ 2))) > l
)
1523 LOG(1, s
, t
, "Length mismatch IPV6CP %u/%u\n", hl
, l
);
1524 STAT(tunnel_rx_errors
);
1529 if (session
[s
].ppp
.phase
< Network
)
1531 LOG(2, s
, t
, "IPV6CP %s ignored in %s phase\n", ppp_code(*p
), ppp_phase(session
[s
].ppp
.phase
));
1535 LOG(3, s
, t
, "IPV6CP: recv %s\n", ppp_code(*p
));
1539 LOG(3, s
, t
, "IPV6CP: no IPv4 address (IPCP in state %s)\n", ppp_state(session
[s
].ppp
.ipcp
));
1540 return; // need IPCP to complete...
1543 if (*p
== ConfigAck
)
1545 switch (session
[s
].ppp
.ipv6cp
)
1548 initialise_restart_count(s
, ipv6cp
);
1549 change_state(s
, ipv6cp
, AckReceived
);
1554 LOG(2, s
, t
, "IPV6CP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session
[s
].ppp
.ipv6cp
));
1556 change_state(s
, ipv6cp
, RequestSent
);
1564 LOG(2, s
, t
, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ipv6cp
));
1567 else if (*p
== ConfigReq
)
1569 uint8_t *response
= 0;
1577 if (!o
[1] || o
[1] > length
) return;
1581 case 1: // interface identifier
1582 gotip
++; // seen address
1583 if (o
[1] != 10) return;
1585 if (session
[s
].ipv6address
.s6_addr
[0])
1587 // LSB 64bits of assigned IPv6 address to user (see radius attribut Framed-IPv6-Address)
1588 memcpy(&ident
[0], &session
[s
].ipv6address
.s6_addr
[8], 8);
1592 ident
[0] = htonl(session
[s
].ip
);
1596 if (memcmp(o
+ 2, ident
, sizeof(ident
)))
1598 q
= ppp_conf_nak(s
, b
, sizeof(b
), PPPIPV6CP
, &response
, q
, p
, o
, (uint8_t *)ident
, sizeof(ident
));
1605 LOG(2, s
, t
, " Rejecting PPP IPV6CP Option type %d\n", *o
);
1606 q
= ppp_conf_rej(s
, b
, sizeof(b
), PPPIPV6CP
, &response
, q
, p
, o
);
1616 l
= q
- response
; // IPV6CP packet length
1617 *((uint16_t *) (response
+ 2)) = htons(l
); // update header
1621 // Send packet back as ConfigAck
1622 response
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPIPV6CP
, 0, 0, 0);
1623 if (!response
) return;
1624 *response
= ConfigAck
;
1628 LOG(1, s
, t
, "No interface identifier in IPV6CP request\n");
1629 STAT(tunnel_rx_errors
);
1633 switch (session
[s
].ppp
.ipv6cp
)
1636 response
= makeppp(b
, sizeof(b
), p
, 2, s
, t
, PPPIPV6CP
, 0, 0, 0);
1637 if (!response
) return;
1638 *response
= TerminateAck
;
1639 *((uint16_t *) (response
+ 2)) = htons(l
= 4);
1643 initialise_restart_count(s
, ipv6cp
);
1645 if (*response
== ConfigAck
)
1646 change_state(s
, ipv6cp
, AckSent
);
1648 change_state(s
, ipv6cp
, RequestSent
);
1653 if (*response
== ConfigAck
)
1654 change_state(s
, ipv6cp
, AckSent
);
1659 if (*response
== ConfigAck
)
1665 initialise_restart_count(s
, ipv6cp
);
1670 if (*response
== ConfigAck
)
1671 change_state(s
, ipv6cp
, AckSent
);
1673 change_state(s
, ipv6cp
, RequestSent
);
1678 LOG(2, s
, t
, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ipv6cp
));
1682 LOG(3, s
, t
, "IPV6CP: send %s\n", ppp_code(*response
));
1683 tunnelsend(b
, l
+ (response
- b
), t
);
1685 else if (*p
== TerminateReq
)
1687 switch (session
[s
].ppp
.ipv6cp
)
1699 zero_restart_count(s
, ipv6cp
);
1700 change_state(s
, ipv6cp
, Closing
);
1704 LOG(2, s
, t
, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ipv6cp
));
1708 *p
= TerminateAck
; // send ack
1709 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPIPV6CP
, 0, 0, 0);
1712 LOG(3, s
, t
, "IPV6CP: send %s\n", ppp_code(*q
));
1713 tunnelsend(b
, l
+ (q
- b
), t
); // send it
1715 else if (*p
!= CodeRej
)
1717 ppp_code_rej(s
, t
, PPPIPV6CP
, "IPV6CP", p
, l
, b
, sizeof(b
));
1721 static void update_sessions_in_stat(sessionidt s
, uint16_t l
)
1723 bundleidt b
= session
[s
].bundle
;
1726 increment_counter(&session
[s
].cin
, &session
[s
].cin_wrap
, l
);
1727 session
[s
].cin_delta
+= l
;
1730 sess_local
[s
].cin
+= l
;
1731 sess_local
[s
].pin
++;
1735 int i
= frag
[b
].re_frame_begin_index
;
1736 int end
= frag
[b
].re_frame_end_index
;
1739 l
= frag
[b
].fragment
[i
].length
;
1740 s
= frag
[b
].fragment
[i
].sid
;
1741 increment_counter(&session
[s
].cin
, &session
[s
].cin_wrap
, l
);
1742 session
[s
].cin_delta
+= l
;
1745 sess_local
[s
].cin
+= l
;
1746 sess_local
[s
].pin
++;
1749 i
= (i
+ 1) & MAXFRAGNUM_MASK
;
1754 // process IP packet received
1756 // This MUST be called with at least 4 byte behind 'p'.
1757 // (i.e. this routine writes to p[-4]).
1758 void processipin(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
1760 in_addr_t ip
, ip_dst
;
1764 LOG_HEX(5, "IP", p
, l
);
1768 LOG(1, s
, t
, "IP packet too short %d\n", l
);
1769 STAT(tunnel_rx_errors
);
1773 ip
= ntohl(*(uint32_t *)(p
+ 12));
1774 ip_dst
= *(uint32_t *)(p
+ 16);
1778 LOG(1, s
, t
, "IP packet too long %d\n", l
);
1779 STAT(tunnel_rx_errors
);
1783 if (session
[s
].ppp
.phase
!= Network
|| session
[s
].ppp
.ipcp
!= Opened
)
1786 if (!session
[s
].bundle
|| bundle
[session
[s
].bundle
].num_of_links
< 2) // FIXME:
1788 // no spoof (do sessionbyip to handled statically routed subnets)
1789 if (!config
->disable_no_spoof
&& ip
!= session
[s
].ip
&& sessionbyip(htonl(ip
)) != s
)
1791 LOG(4, s
, t
, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip
), 0));
1796 // run access-list if any
1797 if (session
[s
].filter_in
&& !ip_filter(p
, l
, session
[s
].filter_in
- 1))
1800 // adjust MSS on SYN and SYN,ACK packets with options
1801 if ((ntohs(*(uint16_t *) (p
+ 6)) & 0x1fff) == 0 && p
[9] == IPPROTO_TCP
) // first tcp fragment
1803 int ihl
= (p
[0] & 0xf) * 4; // length of IP header
1804 if (l
>= ihl
+ 20 && (p
[ihl
+ 13] & TCP_FLAG_SYN
) && ((p
[ihl
+ 12] >> 4) > 5))
1805 adjust_tcp_mss(s
, t
, p
, l
, p
+ ihl
);
1808 // Add on the tun header
1810 *(uint32_t *) p
= htonl(PKTIP
);
1813 if (session
[s
].tbf_in
)
1815 if (!config
->no_throttle_local_IP
|| !sessionbyip(ip_dst
))
1817 // Are we throttling this session?
1818 if (config
->cluster_iam_master
)
1819 tbf_queue_packet(session
[s
].tbf_in
, p
, l
);
1821 master_throttle_packet(session
[s
].tbf_in
, p
, l
);
1827 if (tun_write(p
, l
) < 0)
1829 STAT(tun_tx_errors
);
1830 LOG(0, s
, t
, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
1831 l
, strerror(errno
), tunfd
, p
);
1839 if (session
[s
].snoop_ip
&& session
[s
].snoop_port
)
1841 // Snooping this session
1842 snoop_send_packet(p
, l
, session
[s
].snoop_ip
, session
[s
].snoop_port
);
1845 update_sessions_in_stat(s
, l
);
1849 STAT(tun_tx_packets
);
1850 INC_STAT(tun_tx_bytes
, l
);
1853 // process Multilink PPP packet received
1854 void processmpin(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
1856 bundleidt b
= session
[s
].bundle
;
1857 bundlet
* this_bundle
= &bundle
[b
];
1858 uint32_t maskSeq
, max_seq
;
1860 uint16_t frag_index
, frag_index_next
, frag_index_prev
;
1861 fragmentationt
*this_fragmentation
= &frag
[b
];
1862 uint8_t begin_frame
= (*p
& MP_BEGIN
);
1863 uint8_t end_frame
= (*p
& MP_END
);
1864 uint32_t seq_num
, seq_num_next
, seq_num_prev
;
1867 uint16_t begin_index
, end_index
;
1869 // Perform length checking
1872 LOG(2, s
, t
, "MPPP: discarding fragment larger than MAXFRAGLEN\n");
1878 LOG(2, s
, t
, "MPPP: Invalid bundle id: 0\n");
1881 // FIXME !! session[s].mssf means that the receiver wants to receive frames in mssf not means the receiver will send frames in mssf
1882 /* if(session[s].mssf)
1884 // Get 12 bit for seq number
1885 seq_num = ntohs((*(uint16_t *) p) & 0xFF0F);
1888 // After this point the pointer should be advanced 2 bytes
1889 LOG(3, s, t, "MPPP: 12 bits, sequence number: %d\n",seq_num);
1893 // Get 24 bit for seq number
1894 seq_num
= ntohl((*(uint32_t *) p
) & 0xFFFFFF00);
1897 // After this point the pointer should be advanced 4 bytes
1898 LOG(4, s
, t
, "MPPP: 24 bits sequence number:%d\n",seq_num
);
1901 max_seq
= this_bundle
->max_seq
;
1902 maskSeq
= max_seq
- 1;
1905 * Expand sequence number to 32 bits, making it as close
1906 * as possible to this_fragmentation->M.
1908 seq_num
|= this_fragmentation
->M
& ~maskSeq
;
1909 if ((int)(this_fragmentation
->M
- seq_num
) > (int)(maskSeq
>> 1))
1911 seq_num
+= maskSeq
+ 1;
1913 else if ((int)(seq_num
- this_fragmentation
->M
) > (int)(maskSeq
>> 1))
1915 seq_num
-= maskSeq
+ 1; /* should never happen */
1918 // calculate this fragment's offset from the begin seq in the bundle
1919 frag_offset
= (int) (seq_num
- this_fragmentation
->start_seq
);
1921 sess_local
[s
].last_seq
= seq_num
;
1923 // calculate the jitter average
1924 uint32_t ljitter
= time_now_ms
- sess_local
[s
].prev_time
;
1927 sess_local
[s
].jitteravg
= (sess_local
[s
].jitteravg
+ ljitter
)>>1;
1928 sess_local
[s
].prev_time
= time_now_ms
;
1933 if (seq_num
< this_fragmentation
->M
)
1936 this_fragmentation
->M
= seq_num
;
1940 Mmin
= sess_local
[(this_bundle
->members
[0])].last_seq
;
1941 for (i
= 1; i
< this_bundle
->num_of_links
; i
++)
1943 uint32_t s_seq
= sess_local
[(this_bundle
->members
[i
])].last_seq
;
1947 this_fragmentation
->M
= Mmin
;
1950 // calculate M offset of the M seq in the bundle
1951 int M_offset
= (int) (Mmin
- this_fragmentation
->start_seq
);
1953 if (M_offset
>= MAXFRAGNUM
)
1955 // There have a long break of the link !!!!!!!!
1956 // M_offset is bigger that the fragmentation buffer size
1957 LOG(3, s
, t
, "MPPP: M_offset out of range, min:%d, begin_seq:%d\n", Mmin
, this_fragmentation
->start_seq
);
1959 // Calculate the new start index, the previous frag are lost
1960 begin_index
= (M_offset
+ this_fragmentation
->start_index
) & MAXFRAGNUM_MASK
;
1962 // Set new Start sequence
1963 this_fragmentation
->start_index
= begin_index
;
1964 this_fragmentation
->start_seq
= Mmin
;
1966 // recalculate the fragment offset from the new begin seq in the bundle
1967 frag_offset
= (int) (seq_num
- Mmin
);
1970 // discard this fragment if the packet comes before the start sequence
1971 if (frag_offset
< 0)
1973 // this packet comes before the next
1974 LOG(3, s
, t
, "MPPP: (COMES BEFORE) the next, seq:%d, begin_seq:%d, size_frag:%d, flags:%02X is LOST\n", seq_num
, this_fragmentation
->start_seq
, l
, flags
);
1978 // discard if frag_offset is bigger that the fragmentation buffer size
1979 if (frag_offset
>= MAXFRAGNUM
)
1981 // frag_offset is bigger that the fragmentation buffer size
1982 LOG(3, s
, t
, "MPPP: Index out of range, seq:%d, begin_seq:%d\n", seq_num
, this_fragmentation
->start_seq
);
1986 //caculate received fragment's index in the fragment array
1987 frag_index
= (frag_offset
+ this_fragmentation
->start_index
) & MAXFRAGNUM_MASK
;
1989 // insert the frame in it's place
1990 fragmentt
*this_frag
= &this_fragmentation
->fragment
[frag_index
];
1992 if (this_frag
->length
> 0)
1993 // This fragment is lost, It was around the buffer and it was never completed the packet.
1994 LOG(3, this_frag
->sid
, this_frag
->tid
, "MPPP: (INSERT) seq_num:%d frag_index:%d flags:%02X is LOST\n",
1995 this_frag
->seq
, frag_index
, this_frag
->flags
);
1997 this_frag
->length
= l
;
2000 this_frag
->flags
= flags
;
2001 this_frag
->seq
= seq_num
;
2002 this_frag
->jitteravg
= sess_local
[s
].jitteravg
;
2003 memcpy(this_frag
->data
, p
, l
);
2005 LOG(4, s
, t
, "MPPP: seq_num:%d frag_index:%d INSERTED flags: %02X\n", seq_num
, frag_index
, flags
);
2008 frag_index_next
= (frag_index
+ 1) & MAXFRAGNUM_MASK
;
2009 //previous frag index
2010 frag_index_prev
= (frag_index
- 1) & MAXFRAGNUM_MASK
;
2012 seq_num_next
= seq_num
+ 1;
2014 seq_num_prev
= seq_num
- 1;
2016 // Clean the buffer and log the lost fragments
2017 if ((frag_index_next
!= this_fragmentation
->start_index
) && this_fragmentation
->fragment
[frag_index_next
].length
)
2019 // check if the next frag is a lost fragment
2020 if (this_fragmentation
->fragment
[frag_index_next
].seq
!= seq_num_next
)
2022 // This fragment is lost, It was around the buffer and it was never completed the packet.
2023 LOG(3, this_fragmentation
->fragment
[frag_index_next
].sid
, this_fragmentation
->fragment
[frag_index_next
].tid
,
2024 "MPPP: (NEXT) seq_num:%d frag_index:%d flags:%02X is LOST\n",
2025 this_fragmentation
->fragment
[frag_index_next
].seq
, frag_index_next
,
2026 this_fragmentation
->fragment
[frag_index_next
].flags
);
2027 // this frag is lost
2028 this_fragmentation
->fragment
[frag_index_next
].length
= 0;
2029 this_fragmentation
->fragment
[frag_index_next
].flags
= 0;
2031 if (begin_frame
&& (!end_frame
)) return; // assembling frame failed
2035 // Clean the buffer and log the lost fragments
2036 if ((frag_index
!= this_fragmentation
->start_index
) && this_fragmentation
->fragment
[frag_index_prev
].length
)
2038 // check if the next frag is a lost fragment
2039 if (this_fragmentation
->fragment
[frag_index_prev
].seq
!= seq_num_prev
)
2041 // This fragment is lost, It was around the buffer and it was never completed the packet.
2042 LOG(3, this_fragmentation
->fragment
[frag_index_prev
].sid
, this_fragmentation
->fragment
[frag_index_prev
].tid
,
2043 "MPPP: (PREV) seq_num:%d frag_index:%d flags:%02X is LOST\n",
2044 this_fragmentation
->fragment
[frag_index_prev
].seq
, frag_index_prev
,
2045 this_fragmentation
->fragment
[frag_index_prev
].flags
);
2047 this_fragmentation
->fragment
[frag_index_prev
].length
= 0;
2048 this_fragmentation
->fragment
[frag_index_prev
].flags
= 0;
2050 if (end_frame
&& (!begin_frame
)) return; // assembling frame failed
2055 begin_index
= this_fragmentation
->start_index
;
2056 uint32_t b_seq
= this_fragmentation
->start_seq
;
2057 // Try to find a Begin sequence from the start_seq sequence to M sequence
2058 while (b_seq
< Mmin
)
2060 if (this_fragmentation
->fragment
[begin_index
].length
)
2062 if (b_seq
== this_fragmentation
->fragment
[begin_index
].seq
)
2064 if (this_fragmentation
->fragment
[begin_index
].flags
& MP_BEGIN
)
2067 // Adjust the new start sequence and start index
2068 this_fragmentation
->start_index
= begin_index
;
2069 this_fragmentation
->start_seq
= b_seq
;
2070 // Begin Sequence found, now try to found the End Sequence to complete the frame
2071 end_index
= begin_index
;
2072 while (b_seq
< Mmin
)
2074 if (this_fragmentation
->fragment
[end_index
].length
)
2076 if (b_seq
== this_fragmentation
->fragment
[end_index
].seq
)
2078 if (this_fragmentation
->fragment
[end_index
].flags
& MP_END
)
2080 // The End sequence was found and the frame is complete
2087 // This fragment is lost, it was never completed the packet.
2088 LOG(3, this_fragmentation
->fragment
[end_index
].sid
, this_fragmentation
->fragment
[end_index
].tid
,
2089 "MPPP: (FIND END) seq_num:%d frag_index:%d flags:%02X is LOST\n",
2090 this_fragmentation
->fragment
[end_index
].seq
, begin_index
,
2091 this_fragmentation
->fragment
[end_index
].flags
);
2092 // this frag is lost
2093 this_fragmentation
->fragment
[end_index
].length
= 0;
2094 this_fragmentation
->fragment
[end_index
].flags
= 0;
2095 // This frame is not complete find the next Begin
2101 // This frame is not complete find the next Begin if exist
2104 end_index
= (end_index
+1) & MAXFRAGNUM_MASK
;
2109 // The End sequence was found and the frame is complete
2112 // find the next Begin
2113 begin_index
= end_index
;
2118 // This fragment is lost, it was never completed the packet.
2119 LOG(3, this_fragmentation
->fragment
[begin_index
].sid
, this_fragmentation
->fragment
[begin_index
].tid
,
2120 "MPPP: (FIND BEGIN) seq_num:%d frag_index:%d flags:%02X is LOST\n",
2121 this_fragmentation
->fragment
[begin_index
].seq
, begin_index
,
2122 this_fragmentation
->fragment
[begin_index
].flags
);
2123 // this frag is lost
2124 this_fragmentation
->fragment
[begin_index
].length
= 0;
2125 this_fragmentation
->fragment
[begin_index
].flags
= 0;
2128 begin_index
= (begin_index
+1) & MAXFRAGNUM_MASK
;
2133 // try to assemble the frame that has the received fragment as a member
2134 // get the beginning of this frame
2135 begin_index
= end_index
= this_fragmentation
->start_index
;
2136 if (this_fragmentation
->fragment
[begin_index
].length
)
2138 if (!(this_fragmentation
->fragment
[begin_index
].flags
& MP_BEGIN
))
2140 LOG(3, this_fragmentation
->fragment
[begin_index
].sid
, this_fragmentation
->fragment
[begin_index
].tid
,
2141 "MPPP: (NOT BEGIN) seq_num:%d frag_index:%d flags:%02X\n",
2142 this_fragmentation
->fragment
[begin_index
].seq
, begin_index
,
2143 this_fragmentation
->fragment
[begin_index
].flags
);
2144 // should occur only after an "M_Offset out of range"
2145 // The start sequence must be a begin sequence
2146 this_fragmentation
->start_index
= (begin_index
+1) & MAXFRAGNUM_MASK
;
2147 this_fragmentation
->start_seq
++;
2148 return; // assembling frame failed
2152 return; // assembling frame failed
2154 // get the end of his frame
2155 while (this_fragmentation
->fragment
[end_index
].length
)
2157 if (this_fragmentation
->fragment
[end_index
].flags
& MP_END
)
2160 end_index
= (end_index
+1) & MAXFRAGNUM_MASK
;
2162 if (end_index
== this_fragmentation
->start_index
)
2163 return; // assembling frame failed
2166 // return if a lost fragment is found
2167 if (!(this_fragmentation
->fragment
[end_index
].length
))
2168 return; // assembling frame failed
2170 // assemble the packet
2171 //assemble frame, process it, reset fragmentation
2172 uint16_t cur_len
= 4; // This is set to 4 to leave 4 bytes for function processipin
2174 LOG(4, s
, t
, "MPPP: processing fragments from %d to %d\n", begin_index
, end_index
);
2175 // Push to the receive buffer
2177 for (i
= begin_index
;; i
= (i
+ 1) & MAXFRAGNUM_MASK
)
2179 this_frag
= &this_fragmentation
->fragment
[i
];
2180 if(cur_len
+ this_frag
->length
> MAXETHER
)
2182 LOG(2, s
, t
, "MPPP: discarding reassembled frames larger than MAXETHER\n");
2186 memcpy(this_fragmentation
->reassembled_frame
+cur_len
, this_frag
->data
, this_frag
->length
);
2187 LOG(5, s
, t
, "MPPP: processing frame at %d, with len %d\n", i
, this_frag
->length
);
2189 cur_len
+= this_frag
->length
;
2192 this_fragmentation
->re_frame_len
= cur_len
;
2193 this_fragmentation
->re_frame_begin_index
= begin_index
;
2194 this_fragmentation
->re_frame_end_index
= end_index
;
2195 // Process the resassembled frame
2196 LOG(5, s
, t
, "MPPP: Process the reassembled frame, len=%d\n",cur_len
);
2197 processmpframe(s
, t
, this_fragmentation
->reassembled_frame
, this_fragmentation
->re_frame_len
, 1);
2202 // Set reassembled frame length to zero after processing it
2203 this_fragmentation
->re_frame_len
= 0;
2204 for (i
= begin_index
;; i
= (i
+ 1) & MAXFRAGNUM_MASK
)
2206 this_fragmentation
->fragment
[i
].length
= 0; // Indicates that this fragment has been consumed
2207 this_fragmentation
->fragment
[i
].flags
= 0;
2212 // Set the new start_index and start_seq
2213 this_fragmentation
->start_index
= (end_index
+ 1) & MAXFRAGNUM_MASK
;
2214 this_fragmentation
->start_seq
= this_fragmentation
->fragment
[end_index
].seq
+ 1;
2215 LOG(4, s
, t
, "MPPP after assembling: start index is = %d, start seq=%d\n", this_fragmentation
->start_index
, this_fragmentation
->start_seq
);
2217 begin_index
= this_fragmentation
->start_index
;
2218 if ((this_fragmentation
->fragment
[begin_index
].length
) &&
2219 (this_fragmentation
->fragment
[begin_index
].seq
!= this_fragmentation
->start_seq
))
2221 LOG(3, this_fragmentation
->fragment
[begin_index
].sid
, this_fragmentation
->fragment
[begin_index
].tid
,
2222 "MPPP: (START) seq_num:%d frag_index:%d flags:%02X is LOST\n",
2223 this_fragmentation
->fragment
[begin_index
].seq
, begin_index
,
2224 this_fragmentation
->fragment
[begin_index
].flags
);
2225 this_fragmentation
->fragment
[begin_index
].length
= 0;
2226 this_fragmentation
->fragment
[begin_index
].flags
= 0;
2229 if (this_fragmentation
->start_seq
<= Mmin
)
2230 // It's possible to find other complete frame or lost frame.
2232 else if ((this_fragmentation
->fragment
[begin_index
].length
) &&
2233 (this_fragmentation
->fragment
[begin_index
].flags
& MP_BEGIN
))
2234 // may be that the next frame is completed
2235 goto assembling_frame
;
2240 // process IPv6 packet received
2242 // This MUST be called with at least 4 byte behind 'p'.
2243 // (i.e. this routine writes to p[-4]).
2244 void processipv6in(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
2249 CSTAT(processipv6in
);
2251 LOG_HEX(5, "IPv6", p
, l
);
2253 ip
= *(struct in6_addr
*) (p
+ 8);
2254 ipv4
= ntohl(*(uint32_t *)(p
+ 16));
2258 LOG(1, s
, t
, "IP packet too long %d\n", l
);
2259 STAT(tunnel_rx_errors
);
2263 if (session
[s
].ppp
.phase
!= Network
|| session
[s
].ppp
.ipv6cp
!= Opened
)
2267 if (session
[s
].ipv6address
.s6_addr
[0])
2269 if ((sessionbyipv6new(ip
) != s
) &&
2270 (ip
.s6_addr
[0] != 0xFE || ip
.s6_addr
[1] != 0x80 || ip
.s6_addr16
[1] != 0 || ip
.s6_addr16
[2] != 0 || ip
.s6_addr16
[3] != 0))
2272 char str
[INET6_ADDRSTRLEN
];
2273 LOG(5, s
, t
, "Dropping packet with spoofed IP %s\n",
2274 inet_ntop(AF_INET6
, &ip
, str
, INET6_ADDRSTRLEN
));
2278 else if ((ipv4
!= session
[s
].ip
|| memcmp(&config
->ipv6_prefix
, &ip
, 8)) && sessionbyipv6(ip
) != s
)
2280 char str
[INET6_ADDRSTRLEN
];
2281 LOG(5, s
, t
, "Dropping packet with spoofed IP %s\n",
2282 inet_ntop(AF_INET6
, &ip
, str
, INET6_ADDRSTRLEN
));
2286 // Check if it's a Router Solicition message.
2287 if (*(p
+ 6) == 58 && *(p
+ 7) == 255 && *(p
+ 24) == 0xFF && *(p
+ 25) == 2 &&
2288 *(uint32_t *)(p
+ 26) == 0 && *(uint32_t *)(p
+ 30) == 0 &&
2289 *(uint32_t *)(p
+ 34) == 0 &&
2290 *(p
+ 38) == 0 && *(p
+ 39) == 2 && *(p
+ 40) == 133) {
2291 LOG(3, s
, t
, "Got IPv6 RS\n");
2292 send_ipv6_ra(s
, t
, &ip
);
2296 // Check if DhcpV6, IP dst: FF02::1:2, Src Port 0x0222 (546), Dst Port 0x0223 (547)
2297 if (*(p
+ 6) == 17 && *(p
+ 24) == 0xFF && *(p
+ 25) == 2 &&
2298 *(uint32_t *)(p
+ 26) == 0 && *(uint32_t *)(p
+ 30) == 0 &&
2299 *(uint16_t *)(p
+ 34) == 0 && *(p
+ 36) == 0 && *(p
+ 37) == 1 && *(p
+ 38) == 0 && *(p
+ 39) == 2 &&
2300 *(p
+ 40) == 2 && *(p
+ 41) == 0x22 && *(p
+ 42) == 2 && *(p
+ 43) == 0x23)
2302 dhcpv6_process(s
, t
, p
, l
);
2306 // Add on the tun header
2308 *(uint32_t *) p
= htonl(PKTIPV6
);
2311 // Are we throttled and a slave?
2312 if (session
[s
].tbf_in
&& !config
->cluster_iam_master
) {
2313 // Pass it to the master for handling.
2314 master_throttle_packet(session
[s
].tbf_in
, p
, l
);
2318 // Are we throttled and a master??
2319 if (session
[s
].tbf_in
&& config
->cluster_iam_master
) {
2320 // Actually handle the throttled packets.
2321 tbf_queue_packet(session
[s
].tbf_in
, p
, l
);
2326 if (tun_write(p
, l
) < 0)
2328 STAT(tun_tx_errors
);
2329 LOG(0, s
, t
, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
2330 l
, strerror(errno
), tunfd
, p
);
2338 if (session
[s
].snoop_ip
&& session
[s
].snoop_port
)
2340 // Snooping this session
2341 snoop_send_packet(p
, l
, session
[s
].snoop_ip
, session
[s
].snoop_port
);
2344 update_sessions_in_stat(s
, l
);
2348 STAT(tun_tx_packets
);
2349 INC_STAT(tun_tx_bytes
, l
);
2353 // Helper routine for the TBF filters.
2354 // Used to send queued data in from the user.
2356 void send_ipin(sessionidt s
, uint8_t *buf
, int len
)
2358 LOG_HEX(5, "IP in throttled", buf
, len
);
2360 if (write(tunfd
, buf
, len
) < 0)
2362 STAT(tun_tx_errors
);
2363 LOG(0, 0, 0, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
2364 len
, strerror(errno
), tunfd
, buf
);
2372 if (session
[s
].snoop_ip
&& session
[s
].snoop_port
)
2374 // Snooping this session
2375 snoop_send_packet(buf
, len
, session
[s
].snoop_ip
, session
[s
].snoop_port
);
2378 // Increment packet counters
2379 increment_counter(&session
[s
].cin
, &session
[s
].cin_wrap
, len
);
2380 session
[s
].cin_delta
+= len
;
2383 sess_local
[s
].cin
+= len
;
2384 sess_local
[s
].pin
++;
2388 STAT(tun_tx_packets
);
2389 INC_STAT(tun_tx_bytes
, len
- 4);
2393 // Process CCP messages
2394 void processccp(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
)
2396 uint8_t b
[MAXETHER
];
2401 LOG_HEX(5, "CCP", p
, l
);
2403 if (session
[s
].ppp
.phase
< Network
)
2405 LOG(2, s
, t
, "CCP %s ignored in %s phase\n", ppp_code(*p
), ppp_phase(session
[s
].ppp
.phase
));
2411 LOG(1, s
, t
, "Short CCP packet\n");
2412 STAT(tunnel_rx_errors
);
2415 LOG(4, s
, t
, "CCP: recv %s\n", ppp_code(*p
));
2416 if (*p
== ConfigAck
)
2418 switch (session
[s
].ppp
.ccp
)
2421 initialise_restart_count(s
, ccp
);
2422 change_state(s
, ccp
, AckReceived
);
2427 LOG(2, s
, t
, "CCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session
[s
].ppp
.ccp
));
2429 change_state(s
, ccp
, RequestSent
);
2433 LOG(3, s
, t
, "CCP: Opened\n");
2434 change_state(s
, ccp
, Opened
);
2438 LOG(2, s
, t
, "CCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ccp
));
2441 else if (*p
== ConfigReq
)
2443 if (l
< 6) // accept no compression
2445 else // compression requested--reject
2448 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPCCP
, 0, 0, 0);
2451 switch (session
[s
].ppp
.ccp
)
2454 q
= makeppp(b
, sizeof(b
), p
, 2, s
, t
, PPPCCP
, 0, 0, 0);
2457 *((uint16_t *) (q
+ 2)) = htons(l
= 4);
2461 initialise_restart_count(s
, ccp
);
2463 if (*q
== ConfigAck
)
2464 change_state(s
, ccp
, AckSent
);
2466 change_state(s
, ccp
, RequestSent
);
2471 if (*q
== ConfigAck
)
2472 change_state(s
, ccp
, AckSent
);
2477 if (*q
== ConfigAck
)
2478 change_state(s
, ccp
, Opened
);
2483 initialise_restart_count(s
, ccp
);
2488 if (*q
== ConfigAck
)
2489 change_state(s
, ccp
, AckSent
);
2491 change_state(s
, ccp
, RequestSent
);
2496 LOG(2, s
, t
, "CCP: ignoring %s in state %s\n", ppp_code(*p
), ppp_state(session
[s
].ppp
.ccp
));
2500 LOG(4, s
, t
, "CCP: send %s\n", ppp_code(*q
));
2501 tunnelsend(b
, l
+ (q
- b
), t
);
2503 else if (*p
== TerminateReq
)
2506 q
= makeppp(b
, sizeof(b
), p
, l
, s
, t
, PPPCCP
, 0, 0, 0);
2508 LOG(3, s
, t
, "CCP: send %s\n", ppp_code(*q
));
2509 tunnelsend(b
, l
+ (q
- b
), t
);
2510 change_state(s
, ccp
, Stopped
);
2512 else if (*p
!= CodeRej
)
2514 ppp_code_rej(s
, t
, PPPCCP
, "CCP", p
, l
, b
, sizeof(b
));
2518 // send a CHAP challenge
2519 void sendchap(sessionidt s
, tunnelidt t
)
2521 uint8_t b
[MAXETHER
];
2530 LOG(1, s
, t
, "No RADIUS to send challenge\n");
2531 STAT(tunnel_tx_errors
);
2535 LOG(1, s
, t
, "Send CHAP challenge\n");
2537 radius
[r
].chap
= 1; // CHAP not PAP
2539 if (radius
[r
].state
!= RADIUSCHAP
)
2542 radius
[r
].state
= RADIUSCHAP
;
2543 radius
[r
].retry
= backoff(radius
[r
].try++);
2544 if (radius
[r
].try > 5)
2546 sessionshutdown(s
, "CHAP timeout.", CDN_ADMIN_DISC
, TERM_REAUTHENTICATION_FAILURE
);
2547 STAT(tunnel_tx_errors
);
2550 q
= makeppp(b
, sizeof(b
), 0, 0, s
, t
, PPPCHAP
, 0, 0, 0);
2553 *q
= 1; // challenge
2554 q
[1] = radius
[r
].id
; // ID
2555 q
[4] = 16; // value size (size of challenge)
2556 memcpy(q
+ 5, radius
[r
].auth
, 16); // challenge
2557 strcpy((char *) q
+ 21, config
->multi_n_hostname
[tunnel
[t
].indexudp
][0]?config
->multi_n_hostname
[tunnel
[t
].indexudp
]:hostname
); // our name
2558 *(uint16_t *) (q
+ 2) = htons(strlen(config
->multi_n_hostname
[tunnel
[t
].indexudp
][0]?config
->multi_n_hostname
[tunnel
[t
].indexudp
]:hostname
) + 21); // length
2559 tunnelsend(b
, strlen(config
->multi_n_hostname
[tunnel
[t
].indexudp
][0]?config
->multi_n_hostname
[tunnel
[t
].indexudp
]:hostname
) + 21 + (q
- b
), t
); // send it
2562 // fill in a L2TP message with a PPP frame,
2563 // returns start of PPP frame
2564 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
)
2566 uint16_t hdr
= 0x0002; // L2TP with no options
2567 uint16_t type
= mtype
;
2570 if (t
== TUNNEL_ID_PPPOE
)
2572 return pppoe_makeppp(b
, size
, p
, l
, s
, t
, mtype
, prio
, bid
, mp_bits
);
2575 if (size
< 16) // Need more space than this!!
2577 LOG(0, s
, t
, "makeppp buffer too small for L2TP header (size=%d)\n", size
);
2581 if (prio
) hdr
|= 0x0100; // set priority bit
2583 *(uint16_t *) (b
+ 0) = htons(hdr
);
2584 *(uint16_t *) (b
+ 2) = htons(tunnel
[t
].far
); // tunnel
2585 *(uint16_t *) (b
+ 4) = htons(session
[s
].far
); // session
2588 // Check whether this session is part of multilink
2591 if (bundle
[bid
].num_of_links
> 1)
2592 type
= PPPMP
; // Change PPP message type to the PPPMP
2597 if (type
== PPPLCP
|| !(session
[s
].flags
& SESSION_ACFC
))
2599 *(uint16_t *) b
= htons(0xFF03); // HDLC header
2603 if (type
< 0x100 && session
[s
].flags
& SESSION_PFC
)
2609 *(uint16_t *) b
= htons(type
);
2615 // Set the sequence number and (B)egin (E)nd flags
2616 if (session
[s
].mssf
)
2618 // Set the multilink bits
2619 uint16_t bits_send
= mp_bits
;
2620 *(uint16_t *) b
= htons((bundle
[bid
].seq_num_t
& 0x0FFF)|bits_send
);
2625 *(uint32_t *) b
= htonl(bundle
[bid
].seq_num_t
);
2626 // Set the multilink bits
2631 bundle
[bid
].seq_num_t
++;
2633 // Add the message type if this fragment has the begin bit set
2634 if (mp_bits
& MP_BEGIN
)
2636 //*b++ = mtype; // The next two lines are instead of this
2637 *(uint16_t *) b
= htons(mtype
); // Message type
2642 if ((b
- start
) + l
> size
)
2644 LOG(2, s
, t
, "makeppp would overflow buffer (size=%d, header+payload=%td)\n", size
, (b
- start
) + l
);
2655 // fill in a L2TP message with a PPP frame,
2656 // returns start of PPP frame
2657 //(note: THIS ROUTINE CAN WRITES TO p[-28]).
2658 uint8_t *opt_makeppp(uint8_t *p
, int l
, sessionidt s
, tunnelidt t
, uint16_t mtype
, uint8_t prio
, bundleidt bid
, uint8_t mp_bits
)
2660 uint16_t hdr
= 0x0002; // L2TP with no options
2661 uint16_t type
= mtype
;
2664 if (t
== TUNNEL_ID_PPPOE
)
2666 return opt_pppoe_makeppp(p
, l
, s
, t
, mtype
, prio
, bid
, mp_bits
);
2669 // Check whether this session is part of multilink
2672 if (bundle
[bid
].num_of_links
> 1)
2673 type
= PPPMP
; // Change PPP message type to the PPPMP
2680 // Add the message type if this fragment has the begin bit set
2681 if (mp_bits
& MP_BEGIN
)
2684 *(uint16_t *) b
= htons(mtype
); // Message type
2687 // Set the sequence number and (B)egin (E)nd flags
2688 if (session
[s
].mssf
)
2690 // Set the multilink bits
2691 uint16_t bits_send
= mp_bits
;
2693 *(uint16_t *) b
= htons((bundle
[bid
].seq_num_t
& 0x0FFF)|bits_send
);
2698 *(uint32_t *) b
= htonl(bundle
[bid
].seq_num_t
);
2699 // Set the multilink bits
2703 bundle
[bid
].seq_num_t
++;
2706 if (type
< 0x100 && session
[s
].flags
& SESSION_PFC
)
2714 *(uint16_t *) b
= htons(type
);
2717 if (type
== PPPLCP
|| !(session
[s
].flags
& SESSION_ACFC
))
2720 *(uint16_t *) b
= htons(0xFF03); // HDLC header
2723 if (prio
) hdr
|= 0x0100; // set priority bit
2725 *(uint16_t *) b
= htons(session
[s
].far
); // session
2727 *(uint16_t *) b
= htons(tunnel
[t
].far
); // tunnel
2729 *(uint16_t *) b
= htons(hdr
);
2734 static int add_lcp_auth(uint8_t *b
, int size
, int authtype
)
2737 if ((authtype
== AUTHCHAP
&& size
< 5) || size
< 4)
2740 *b
++ = 3; // Authentication-Protocol
2741 if (authtype
== AUTHCHAP
)
2743 len
= *b
++ = 5; // length
2744 *(uint16_t *) b
= htons(PPPCHAP
); b
+= 2;
2747 else if (authtype
== AUTHPAP
)
2749 len
= *b
++ = 4; // length
2750 *(uint16_t *) b
= htons(PPPPAP
); b
+= 2;
2754 LOG(0, 0, 0, "add_lcp_auth called with unsupported auth type %d\n", authtype
);
2760 // Send LCP ConfigReq for MRU, authentication type and magic no
2761 void sendlcp(sessionidt s
, tunnelidt t
)
2763 uint8_t b
[500], *q
, *l
;
2764 int authtype
= sess_local
[s
].lcp_authtype
;
2766 if (!(q
= makeppp(b
, sizeof(b
), NULL
, 0, s
, t
, PPPLCP
, 0, 0, 0)))
2769 LOG(3, s
, t
, "LCP: send ConfigReq%s%s%s including MP options\n",
2770 authtype
? " (" : "",
2771 authtype
? (authtype
== AUTHCHAP
? "CHAP" : "PAP") : "",
2772 authtype
? ")" : "");
2776 *l
++ = ++sess_local
[s
].lcp_ident
; // ID
2778 l
+= 2; //Save space for length
2780 if (sess_local
[s
].ppp_mru
)
2782 *l
++ = 1; *l
++ = 4; // Maximum-Receive-Unit (length 4)
2783 *(uint16_t *) l
= htons(sess_local
[s
].ppp_mru
); l
+= 2;
2787 l
+= add_lcp_auth(l
, sizeof(b
) - (l
- b
), authtype
);
2789 if (session
[s
].magic
)
2791 *l
++ = 5; *l
++ = 6; // Magic-Number (length 6)
2792 *(uint32_t *) l
= htonl(session
[s
].magic
);
2796 if (sess_local
[s
].mp_mrru
)
2798 *l
++ = 17; *l
++ = 4; // Multilink Max-Receive-Reconstructed-Unit (length 4)
2799 *(uint16_t *) l
= htons(sess_local
[s
].mp_mrru
); l
+= 2;
2802 if (sess_local
[s
].mp_epdis
)
2804 *l
++ = 19; *l
++ = 7; // Multilink Endpoint Discriminator (length 7)
2805 *l
++ = IPADDR
; // Endpoint Discriminator class
2806 *(uint32_t *) l
= htonl(sess_local
[s
].mp_epdis
);
2810 *(uint16_t *)(q
+ 2) = htons(l
- q
); // Length
2812 LOG_HEX(5, "PPPLCP", q
, l
- q
);
2813 if (config
->debug
> 3) dumplcp(q
, l
- q
);
2815 tunnelsend(b
, (l
- b
), t
);
2816 restart_timer(s
, lcp
);
2819 // Send CCP request for no compression
2820 void sendccp(sessionidt s
, tunnelidt t
)
2824 if (!(q
= makeppp(b
, sizeof(b
), NULL
, 0, s
, t
, PPPCCP
, 0, 0, 0)))
2827 LOG(3, s
, t
, "CCP: send ConfigReq (no compression)\n");
2830 *(q
+ 1) = ++sess_local
[s
].lcp_ident
; // ID
2831 *(uint16_t *)(q
+ 2) = htons(4); // Length
2833 LOG_HEX(5, "PPPCCP", q
, 4);
2834 tunnelsend(b
, (q
- b
) + 4 , t
);
2835 restart_timer(s
, ccp
);
2838 // Reject unknown/unconfigured protocols
2839 void protoreject(sessionidt s
, tunnelidt t
, uint8_t *p
, uint16_t l
, uint16_t proto
)
2842 uint8_t buf
[MAXETHER
];
2844 int mru
= session
[s
].mru
;
2845 if (mru
< MINMTU
) mru
= MINMTU
;
2846 if (mru
> sizeof(buf
)) mru
= sizeof(buf
);
2849 if (l
> mru
) l
= mru
;
2851 q
= makeppp(buf
, sizeof(buf
), 0, 0, s
, t
, PPPLCP
, 0, 0, 0);
2855 *(q
+ 1) = ++sess_local
[s
].lcp_ident
;
2856 *(uint16_t *)(q
+ 2) = htons(l
);
2857 *(uint16_t *)(q
+ 4) = htons(proto
);
2858 memcpy(q
+ 6, p
, l
- 6);
2860 if (proto
== PPPIPV6CP
)
2861 LOG(3, s
, t
, "LCP: send ProtocolRej (IPV6CP: not configured)\n");
2863 LOG(2, s
, t
, "LCP: sent ProtocolRej (0x%04X: unsupported)\n", proto
);
2865 tunnelsend(buf
, l
+ (q
- buf
), t
);