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[l2tpns.git] / ppp.c
1 // L2TPNS PPP Stuff
2
3 #include <stdio.h>
4 #include <string.h>
5 #include <unistd.h>
6 #include <errno.h>
7 #include <stdlib.h>
8 #include <netinet/ip6.h>
9 #include "dhcp6.h"
10 #include "l2tpns.h"
11 #include "constants.h"
12 #include "plugin.h"
13 #include "util.h"
14 #include "tbf.h"
15 #include "cluster.h"
16
17 #include "l2tplac.h"
18 #include "pppoe.h"
19
20 extern tunnelt *tunnel;
21 extern bundlet *bundle;
22 extern fragmentationt *frag;
23 extern sessiont *session;
24 extern radiust *radius;
25 extern int tunfd;
26 extern char hostname[];
27 extern uint32_t eth_tx;
28 extern time_t time_now;
29 extern uint64_t time_now_ms;
30 extern configt *config;
31
32 static int add_lcp_auth(uint8_t *b, int size, int authtype);
33 static bundleidt new_bundle(void);
34 static int epdiscmp(epdist, epdist);
35 static void setepdis(epdist *, epdist);
36 static void ipcp_open(sessionidt s, tunnelidt t);
37
38 static int first_session_in_bundle(sessionidt s)
39 {
40 bundleidt i;
41 for (i = 1; i < MAXBUNDLE; i++)
42 if (bundle[i].state != BUNDLEFREE)
43 if (epdiscmp(session[s].epdis,bundle[i].epdis) && !strcmp(session[s].user, bundle[i].user))
44 return 0;
45 return 1;
46 }
47
48 // Process PAP messages
49 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
50 {
51 char user[MAXUSER];
52 char pass[MAXPASS];
53 uint16_t hl;
54 uint16_t r;
55
56 CSTAT(processpap);
57
58 LOG_HEX(5, "PAP", p, l);
59 if (l < 4)
60 {
61 LOG(1, s, t, "Short PAP %u bytes\n", l);
62 STAT(tunnel_rx_errors);
63 sessionshutdown(s, "Short PAP packet.", CDN_ADMIN_DISC, TERM_USER_ERROR);
64 return;
65 }
66
67 if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
68 {
69 LOG(1, s, t, "Length mismatch PAP %u/%u\n", hl, l);
70 STAT(tunnel_rx_errors);
71 sessionshutdown(s, "PAP length mismatch.", CDN_ADMIN_DISC, TERM_USER_ERROR);
72 return;
73 }
74 l = hl;
75
76 if (*p != 1)
77 {
78 LOG(1, s, t, "Unexpected PAP code %d\n", *p);
79 STAT(tunnel_rx_errors);
80 sessionshutdown(s, "Unexpected PAP code.", CDN_ADMIN_DISC, TERM_USER_ERROR);
81 return;
82 }
83
84 if (session[s].ppp.phase != Authenticate)
85 {
86 LOG(2, s, t, "PAP ignored in %s phase\n", ppp_phase(session[s].ppp.phase));
87 return;
88 }
89
90 {
91 uint8_t *b = p;
92 b += 4;
93 user[0] = pass[0] = 0;
94 if (*b && *b < sizeof(user))
95 {
96 memcpy(user, b + 1, *b);
97 user[*b] = 0;
98 b += 1 + *b;
99 if (*b && *b < sizeof(pass))
100 {
101 memcpy(pass, b + 1, *b);
102 pass[*b] = 0;
103 }
104 }
105 LOG(3, s, t, "PAP login %s/%s\n", user, pass);
106 }
107
108 if ((!config->disable_lac_func) && lac_conf_forwardtoremotelns(s, user))
109 {
110 // Creating a tunnel/session has been started
111 return;
112 }
113
114 if (session[s].ip || !(r = radiusnew(s)))
115 {
116 // respond now, either no RADIUS available or already authenticated
117 uint8_t b[MAXETHER];
118 uint8_t id = p[1];
119 uint8_t *p = makeppp(b, sizeof(b), 0, 0, s, t, PPPPAP, 0, 0, 0);
120 if (!p) return;
121
122 if (session[s].ip)
123 *p = 2; // ACK
124 else
125 *p = 3; // cant authorise
126 p[1] = id;
127 *(uint16_t *) (p + 2) = htons(5); // length
128 p[4] = 0; // no message
129 tunnelsend(b, 5 + (p - b), t); // send it
130
131 if (session[s].ip)
132 {
133 LOG(3, s, t, "Already an IP allocated: %s (%d)\n",
134 fmtaddr(htonl(session[s].ip), 0), session[s].ip_pool_index);
135 }
136 else
137 {
138 LOG(1, s, t, "No RADIUS session available to authenticate session...\n");
139 sessionshutdown(s, "No free RADIUS sessions.", CDN_UNAVAILABLE, TERM_SERVICE_UNAVAILABLE);
140 }
141 }
142 else
143 {
144 // Run PRE_AUTH plugins
145 struct param_pre_auth packet = { &tunnel[t], &session[s], strdup(user), strdup(pass), PPPPAP, 1 };
146 run_plugins(PLUGIN_PRE_AUTH, &packet);
147 if (!packet.continue_auth)
148 {
149 LOG(3, s, t, "A plugin rejected PRE_AUTH\n");
150 if (packet.username) free(packet.username);
151 if (packet.password) free(packet.password);
152 return;
153 }
154
155 strncpy(session[s].user, packet.username, sizeof(session[s].user) - 1);
156 strncpy(radius[r].pass, packet.password, sizeof(radius[r].pass) - 1);
157
158 free(packet.username);
159 free(packet.password);
160
161 radius[r].id = p[1];
162 LOG(3, s, t, "Sending login for %s/%s to RADIUS\n", user, pass);
163 if ((session[s].mrru) && (!first_session_in_bundle(s)))
164 radiussend(r, RADIUSJUSTAUTH);
165 else
166 radiussend(r, RADIUSAUTH);
167 }
168 }
169
170 // Process CHAP messages
171 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
172 {
173 uint16_t r;
174 uint16_t hl;
175
176 CSTAT(processchap);
177
178 LOG_HEX(5, "CHAP", p, l);
179
180 if (l < 4)
181 {
182 LOG(1, s, t, "Short CHAP %u bytes\n", l);
183 STAT(tunnel_rx_errors);
184 sessionshutdown(s, "Short CHAP packet.", CDN_ADMIN_DISC, TERM_USER_ERROR);
185 return;
186 }
187
188 if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
189 {
190 LOG(1, s, t, "Length mismatch CHAP %u/%u\n", hl, l);
191 STAT(tunnel_rx_errors);
192 sessionshutdown(s, "CHAP length mismatch.", CDN_ADMIN_DISC, TERM_USER_ERROR);
193 return;
194 }
195 l = hl;
196
197 if (*p != 2)
198 {
199 LOG(1, s, t, "Unexpected CHAP response code %d\n", *p);
200 STAT(tunnel_rx_errors);
201 sessionshutdown(s, "CHAP length mismatch.", CDN_ADMIN_DISC, TERM_USER_ERROR);
202 return;
203 }
204
205 if (session[s].ppp.phase != Authenticate)
206 {
207 LOG(2, s, t, "CHAP ignored in %s phase\n", ppp_phase(session[s].ppp.phase));
208 return;
209 }
210
211 r = sess_local[s].radius;
212 if (!r)
213 {
214 LOG(3, s, t, "Unexpected CHAP message\n");
215
216 // Some modems (Netgear DM602, possibly others) persist in using CHAP even
217 // after ACKing our ConfigReq for PAP.
218 if (sess_local[s].lcp_authtype == AUTHPAP && config->radius_authtypes & AUTHCHAP)
219 {
220 sess_local[s].lcp_authtype = AUTHCHAP;
221 sendchap(s, t);
222 }
223 return;
224 }
225
226 if (p[1] != radius[r].id)
227 {
228 LOG(1, s, t, "Wrong CHAP response ID %d (should be %d) (%d)\n", p[1], radius[r].id, r);
229 STAT(tunnel_rx_errors);
230 sessionshutdown(s, "Unexpected CHAP response ID.", CDN_ADMIN_DISC, TERM_USER_ERROR);
231 return;
232 }
233
234 if (l < 5 || p[4] != 16)
235 {
236 LOG(1, s, t, "Bad CHAP response length %d\n", l < 5 ? -1 : p[4]);
237 STAT(tunnel_rx_errors);
238 sessionshutdown(s, "Bad CHAP response length.", CDN_ADMIN_DISC, TERM_USER_ERROR);
239 return;
240 }
241
242 l -= 5;
243 p += 5;
244 if (l < 16 || l - 16 >= sizeof(session[s].user))
245 {
246 LOG(1, s, t, "CHAP user too long %d\n", l - 16);
247 STAT(tunnel_rx_errors);
248 sessionshutdown(s, "CHAP username too long.", CDN_ADMIN_DISC, TERM_USER_ERROR);
249 return;
250 }
251
252 // Run PRE_AUTH plugins
253 {
254 struct param_pre_auth packet = { &tunnel[t], &session[s], NULL, NULL, PPPCHAP, 1 };
255
256 packet.password = calloc(17, 1);
257 memcpy(packet.password, p, 16);
258
259 p += 16;
260 l -= 16;
261
262 packet.username = calloc(l + 1, 1);
263 memcpy(packet.username, p, l);
264
265 if ((!config->disable_lac_func) && lac_conf_forwardtoremotelns(s, packet.username))
266 {
267 free(packet.username);
268 free(packet.password);
269 // Creating a tunnel/session has been started
270 return;
271 }
272
273 run_plugins(PLUGIN_PRE_AUTH, &packet);
274 if (!packet.continue_auth)
275 {
276 LOG(3, s, t, "A plugin rejected PRE_AUTH\n");
277 if (packet.username) free(packet.username);
278 if (packet.password) free(packet.password);
279 return;
280 }
281
282 strncpy(session[s].user, packet.username, sizeof(session[s].user) - 1);
283 memcpy(radius[r].pass, packet.password, 16);
284
285 free(packet.username);
286 free(packet.password);
287 }
288
289 radius[r].chap = 1;
290 LOG(3, s, t, "CHAP login %s\n", session[s].user);
291 if ((session[s].mrru) && (!first_session_in_bundle(s)))
292 radiussend(r, RADIUSJUSTAUTH);
293 else
294 radiussend(r, RADIUSAUTH);
295 }
296
297 static void dumplcp(uint8_t *p, int l)
298 {
299 int x = l - 4;
300 uint8_t *o = (p + 4);
301
302 LOG_HEX(5, "PPP LCP Packet", p, l);
303 LOG(4, 0, 0, "PPP LCP Packet type %d (%s len %d)\n", *p, ppp_code((int)*p), ntohs( ((uint16_t *) p)[1]) );
304 LOG(4, 0, 0, "Length: %d\n", l);
305 if (*p != ConfigReq && *p != ConfigRej && *p != ConfigAck)
306 return;
307
308 while (x > 2)
309 {
310 int type = o[0];
311 int length = o[1];
312 if (length < 2)
313 {
314 LOG(4, 0, 0, " Option length is %d...\n", length);
315 break;
316 }
317 if (type == 0)
318 {
319 LOG(4, 0, 0, " Option type is 0...\n");
320 x -= length;
321 o += length;
322 continue;
323 }
324 switch (type)
325 {
326 case 1: // Maximum-Receive-Unit
327 if (length == 4)
328 LOG(4, 0, 0, " %s %d\n", ppp_lcp_option(type), ntohs(*(uint16_t *)(o + 2)));
329 else
330 LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length);
331 break;
332 case 2: // Async-Control-Character-Map
333 if (length == 6)
334 {
335 uint32_t asyncmap = ntohl(*(uint32_t *)(o + 2));
336 LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type), asyncmap);
337 }
338 else
339 LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length);
340 break;
341 case 3: // Authentication-Protocol
342 if (length == 4)
343 {
344 int proto = ntohs(*(uint16_t *)(o + 2));
345 LOG(4, 0, 0, " %s 0x%x (%s)\n", ppp_lcp_option(type), proto,
346 proto == PPPPAP ? "PAP" : "UNSUPPORTED");
347 }
348 else if (length == 5)
349 {
350 int proto = ntohs(*(uint16_t *)(o + 2));
351 int algo = *(o + 4);
352 LOG(4, 0, 0, " %s 0x%x 0x%x (%s)\n", ppp_lcp_option(type), proto, algo,
353 (proto == PPPCHAP && algo == 5) ? "CHAP MD5" : "UNSUPPORTED");
354 }
355 else
356 LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length);
357 break;
358 case 4: // Quality-Protocol
359 {
360 uint32_t qp = ntohl(*(uint32_t *)(o + 2));
361 LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type), qp);
362 }
363 break;
364 case 5: // Magic-Number
365 if (length == 6)
366 {
367 uint32_t magicno = ntohl(*(uint32_t *)(o + 2));
368 LOG(4, 0, 0, " %s %x\n", ppp_lcp_option(type), magicno);
369 }
370 else
371 LOG(4, 0, 0, " %s odd length %d\n", ppp_lcp_option(type), length);
372 break;
373 case 7: // Protocol-Field-Compression
374 case 8: // Address-And-Control-Field-Compression
375 LOG(4, 0, 0, " %s\n", ppp_lcp_option(type));
376 break;
377 default:
378 LOG(2, 0, 0, " Unknown PPP LCP Option type %d\n", type);
379 break;
380 }
381 x -= length;
382 o += length;
383 }
384 }
385
386 void lcp_open(sessionidt s, tunnelidt t)
387 {
388 // transition to Authentication or Network phase:
389 session[s].ppp.phase = sess_local[s].lcp_authtype ? Authenticate : Network;
390
391 LOG(3, s, t, "LCP: Opened, phase %s\n", ppp_phase(session[s].ppp.phase));
392
393 // LCP now Opened
394 change_state(s, lcp, Opened);
395
396 if (session[s].ppp.phase == Authenticate)
397 {
398 if (sess_local[s].lcp_authtype == AUTHCHAP)
399 sendchap(s, t);
400 }
401 else
402 {
403 if(session[s].bundle == 0 || bundle[session[s].bundle].num_of_links == 1)
404 {
405 // This-Layer-Up
406 sendipcp(s, t);
407 change_state(s, ipcp, RequestSent);
408 // move to passive state for IPv6 (if configured), CCP
409 if (config->ipv6_prefix.s6_addr[0])
410 change_state(s, ipv6cp, Stopped);
411 else
412 change_state(s, ipv6cp, Closed);
413
414 change_state(s, ccp, Stopped);
415 }
416 else
417 {
418 sessionidt first_ses = bundle[session[s].bundle].members[0];
419 LOG(3, s, t, "MPPP: Skipping IPCP negotiation for session:%d, first session of bundle is:%d\n",s,first_ses);
420 ipcp_open(s, t);
421 }
422 }
423 }
424
425 void lcp_restart(sessionidt s)
426 {
427 session[s].ppp.phase = Establish;
428 // This-Layer-Down
429 change_state(s, ipcp, Dead);
430 change_state(s, ipv6cp, Dead);
431 change_state(s, ccp, Dead);
432 }
433
434 static uint8_t *ppp_conf_rej(sessionidt s, uint8_t *buf, size_t blen, uint16_t mtype,
435 uint8_t **response, uint8_t *queued, uint8_t *packet, uint8_t *option)
436 {
437 if (!*response || **response != ConfigRej)
438 {
439 queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype, 0, 0, 0);
440 if (!queued)
441 return 0;
442
443 *queued = ConfigRej;
444 queued += 4;
445 }
446
447 if ((queued - buf + option[1]) > blen)
448 {
449 LOG(2, s, session[s].tunnel, "PPP overflow for ConfigRej (proto %u, option %u).\n", mtype, *option);
450 return 0;
451 }
452
453 memcpy(queued, option, option[1]);
454 return queued + option[1];
455 }
456
457 static uint8_t *ppp_conf_nak(sessionidt s, uint8_t *buf, size_t blen, uint16_t mtype,
458 uint8_t **response, uint8_t *queued, uint8_t *packet, uint8_t *option,
459 uint8_t *value, size_t vlen)
460 {
461 int *nak_sent;
462 switch (mtype)
463 {
464 case PPPLCP: nak_sent = &sess_local[s].lcp.nak_sent; break;
465 case PPPIPCP: nak_sent = &sess_local[s].ipcp.nak_sent; break;
466 case PPPIPV6CP: nak_sent = &sess_local[s].ipv6cp.nak_sent; break;
467 default: return 0; // ?
468 }
469
470 if (*response && **response != ConfigNak)
471 {
472 if (*nak_sent < config->ppp_max_failure) // reject queued
473 return queued;
474
475 return ppp_conf_rej(s, buf, blen, mtype, response, 0, packet, option);
476 }
477
478 if (!*response)
479 {
480 if (*nak_sent >= config->ppp_max_failure)
481 return ppp_conf_rej(s, buf, blen, mtype, response, 0, packet, option);
482
483 queued = *response = makeppp(buf, blen, packet, 2, s, session[s].tunnel, mtype, 0, 0, 0);
484 if (!queued)
485 return 0;
486
487 (*nak_sent)++;
488 *queued = ConfigNak;
489 queued += 4;
490 }
491
492 if ((queued - buf + vlen + 2) > blen)
493 {
494 LOG(2, s, session[s].tunnel, "PPP overflow for ConfigNak (proto %u, option %u).\n", mtype, *option);
495 return 0;
496 }
497
498 *queued++ = *option;
499 *queued++ = vlen + 2;
500 memcpy(queued, value, vlen);
501 return queued + vlen;
502 }
503
504 static void ppp_code_rej(sessionidt s, tunnelidt t, uint16_t proto,
505 char *pname, uint8_t *p, uint16_t l, uint8_t *buf, size_t size)
506 {
507 uint8_t *q;
508 int mru = session[s].mru;
509 if (mru < MINMTU) mru = MINMTU;
510 if (mru > size) mru = size;
511
512 l += 4;
513 if (l > mru) l = mru;
514
515 q = makeppp(buf, size, 0, 0, s, t, proto, 0, 0, 0);
516 if (!q) return;
517
518 *q = CodeRej;
519 *(q + 1) = ++sess_local[s].lcp_ident;
520 *(uint16_t *)(q + 2) = htons(l);
521 memcpy(q + 4, p, l - 4);
522
523 LOG(2, s, t, "Unexpected %s code %s\n", pname, ppp_code(*p));
524 LOG(3, s, t, "%s: send %s\n", pname, ppp_code(*q));
525 if (config->debug > 3) dumplcp(q, l);
526
527 tunnelsend(buf, l + (q - buf), t);
528 }
529
530 // Process LCP messages
531 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
532 {
533 uint8_t b[MAXETHER];
534 uint8_t *q = NULL;
535 uint16_t hl;
536
537 CSTAT(processlcp);
538
539 LOG_HEX(5, "LCP", p, l);
540 if (l < 4)
541 {
542 LOG(1, s, t, "Short LCP %d bytes\n", l);
543 STAT(tunnel_rx_errors);
544 return ;
545 }
546
547 if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
548 {
549 LOG(1, s, t, "Length mismatch LCP %u/%u\n", hl, l);
550 STAT(tunnel_rx_errors);
551 return ;
552 }
553 l = hl;
554
555 if (session[s].die) // going down...
556 return;
557
558 LOG(((*p == EchoReq || *p == EchoReply) ? 4 : 3), s, t,
559 "LCP: recv %s\n", ppp_code(*p));
560
561 if (config->debug > 3) dumplcp(p, l);
562
563 if (*p == ConfigAck)
564 {
565 int x = l - 4;
566 uint8_t *o = (p + 4);
567 int authtype = 0;
568
569 while (x > 2)
570 {
571 int type = o[0];
572 int length = o[1];
573
574 if (length == 0 || type == 0 || x < length) break;
575 switch (type)
576 {
577 case 3: // Authentication-Protocol
578 {
579 int proto = ntohs(*(uint16_t *)(o + 2));
580 if (proto == PPPPAP)
581 authtype = AUTHPAP;
582 else if (proto == PPPCHAP && *(o + 4) == 5)
583 authtype = AUTHCHAP;
584 }
585
586 break;
587 }
588 x -= length;
589 o += length;
590 }
591
592 if (!session[s].ip && authtype)
593 sess_local[s].lcp_authtype = authtype;
594
595 switch (session[s].ppp.lcp)
596 {
597 case RequestSent:
598 initialise_restart_count(s, lcp);
599 change_state(s, lcp, AckReceived);
600 break;
601
602 case AckReceived:
603 case Opened:
604 LOG(2, s, t, "LCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.lcp));
605 if (session[s].ppp.lcp == Opened)
606 lcp_restart(s);
607
608 sendlcp(s, t);
609 change_state(s, lcp, RequestSent);
610 break;
611
612 case AckSent:
613 lcp_open(s, t);
614 break;
615
616 default:
617 LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp));
618 }
619 }
620 else if (*p == ConfigReq)
621 {
622 int x = l - 4;
623 uint8_t *o = (p + 4);
624 uint8_t *response = 0;
625 static uint8_t asyncmap[4] = { 0, 0, 0, 0 }; // all zero
626 static uint8_t authproto[5];
627 int changed = 0;
628
629 while (x > 2)
630 {
631 int type = o[0];
632 int length = o[1];
633
634 if (length == 0 || type == 0 || x < length) break;
635 switch (type)
636 {
637 case 1: // Maximum-Receive-Unit
638 {
639 uint16_t mru = ntohs(*(uint16_t *)(o + 2));
640 if (mru >= MINMTU)
641 {
642 session[s].mru = mru;
643 changed++;
644 break;
645 }
646
647 LOG(3, s, t, " Remote requesting MRU of %u. Rejecting.\n", mru);
648 mru = htons(MRU);
649 q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, (uint8_t *) &mru, sizeof(mru));
650 }
651 break;
652
653 case 2: // Async-Control-Character-Map
654 if (!ntohl(*(uint32_t *)(o + 2))) // all bits zero is OK
655 break;
656
657 LOG(3, s, t, " Remote requesting asyncmap. Rejecting.\n");
658 q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, asyncmap, sizeof(asyncmap));
659 break;
660
661 case 3: // Authentication-Protocol
662 {
663 int proto = ntohs(*(uint16_t *)(o + 2));
664 char proto_name[] = "0x0000";
665 int alen;
666
667 if (proto == PPPPAP)
668 {
669 if (config->radius_authtypes & AUTHPAP)
670 {
671 sess_local[s].lcp_authtype = AUTHPAP;
672 break;
673 }
674
675 strcpy(proto_name, "PAP");
676 }
677 else if (proto == PPPCHAP)
678 {
679 if (config->radius_authtypes & AUTHCHAP
680 && *(o + 4) == 5) // MD5
681 {
682 sess_local[s].lcp_authtype = AUTHCHAP;
683 break;
684 }
685
686 strcpy(proto_name, "CHAP");
687 }
688 else
689 sprintf(proto_name, "%#4.4x", proto);
690
691 LOG(3, s, t, " Remote requesting %s authentication. Rejecting.\n", proto_name);
692
693 alen = add_lcp_auth(authproto, sizeof(authproto), config->radius_authprefer);
694 if (alen < 2) break; // paranoia
695
696 q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, authproto + 2, alen - 2);
697 if (q && *response == ConfigNak &&
698 config->radius_authtypes != config->radius_authprefer)
699 {
700 // alternate type
701 alen = add_lcp_auth(authproto, sizeof(authproto), config->radius_authtypes & ~config->radius_authprefer);
702 if (alen < 2) break;
703 q = ppp_conf_nak(s, b, sizeof(b), PPPLCP, &response, q, p, o, authproto + 2, alen - 2);
704 }
705
706 break;
707 }
708 break;
709
710 case 4: // Quality-Protocol
711 case 5: // Magic-Number
712 case 7: // Protocol-Field-Compression
713 case 8: // Address-And-Control-Field-Compression
714 break;
715
716 case 17: // Multilink Max-Receive-Reconstructed-Unit
717 {
718 uint16_t mrru = ntohs(*(uint16_t *)(o + 2));
719 session[s].mrru = mrru;
720 changed++;
721 LOG(3, s, t, " Received PPP LCP option MRRU: %d\n",mrru);
722 }
723 break;
724
725 case 18: // Multilink Short Sequence Number Header Format
726 {
727 session[s].mssf = 1;
728 changed++;
729 LOG(3, s, t, " Received PPP LCP option MSSN format\n");
730 }
731 break;
732
733 case 19: // Multilink Endpoint Discriminator
734 {
735 uint8_t epdis_class = o[2];
736 int addr;
737
738 session[s].epdis.addr_class = epdis_class;
739 session[s].epdis.length = length - 3;
740 if (session[s].epdis.length > 20)
741 {
742 LOG(1, s, t, "Error: received EndDis Address Length more than 20: %d\n", session[s].epdis.length);
743 session[s].epdis.length = 20;
744 }
745
746 for (addr = 0; addr < session[s].epdis.length; addr++)
747 session[s].epdis.address[addr] = o[3+addr];
748
749 changed++;
750
751 switch (epdis_class)
752 {
753 case LOCALADDR:
754 LOG(3, s, t, " Received PPP LCP option Multilink EndDis Local Address Class: %d\n",epdis_class);
755 break;
756 case IPADDR:
757 LOG(3, s, t, " Received PPP LCP option Multilink EndDis IP Address Class: %d\n",epdis_class);
758 break;
759 case IEEEMACADDR:
760 LOG(3, s, t, " Received PPP LCP option Multilink EndDis IEEE MAC Address Class: %d\n",epdis_class);
761 break;
762 case PPPMAGIC:
763 LOG(3, s, t, " Received PPP LCP option Multilink EndDis PPP Magic No Class: %d\n",epdis_class);
764 break;
765 case PSNDN:
766 LOG(3, s, t, " Received PPP LCP option Multilink EndDis PSND No Class: %d\n",epdis_class);
767 break;
768 default:
769 LOG(3, s, t, " Received PPP LCP option Multilink EndDis NULL Class %d\n",epdis_class);
770 }
771 }
772 break;
773
774 default: // Reject any unknown options
775 LOG(3, s, t, " Rejecting unknown PPP LCP option %d\n", type);
776 q = ppp_conf_rej(s, b, sizeof(b), PPPLCP, &response, q, p, o);
777 }
778 x -= length;
779 o += length;
780 }
781
782 if (changed)
783 cluster_send_session(s);
784
785 if (response)
786 {
787 l = q - response; // LCP packet length
788 *((uint16_t *) (response + 2)) = htons(l); // update header
789 }
790 else
791 {
792 // Send packet back as ConfigAck
793 response = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0);
794 if (!response) return;
795 *response = ConfigAck;
796 }
797
798 switch (session[s].ppp.lcp)
799 {
800 case Closed:
801 response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP, 0, 0, 0);
802 if (!response) return;
803 *response = TerminateAck;
804 *((uint16_t *) (response + 2)) = htons(l = 4);
805 break;
806
807 case Stopped:
808 initialise_restart_count(s, lcp);
809 sendlcp(s, t);
810 if (*response == ConfigAck)
811 change_state(s, lcp, AckSent);
812 else
813 change_state(s, lcp, RequestSent);
814
815 break;
816
817 case RequestSent:
818 if (*response == ConfigAck)
819 change_state(s, lcp, AckSent);
820
821 break;
822
823 case AckReceived:
824 if (*response == ConfigAck)
825 lcp_open(s, t);
826
827 break;
828
829 case Opened:
830 lcp_restart(s);
831 sendlcp(s, t);
832 /* fallthrough */
833
834 case AckSent:
835 if (*response == ConfigAck)
836 change_state(s, lcp, AckSent);
837 else
838 change_state(s, lcp, RequestSent);
839
840 break;
841
842 case Closing:
843 sessionshutdown(s, "LCP: ConfigReq in state Closing. This should not happen. Killing session.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
844 break;
845
846 default:
847 LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp));
848 return;
849 }
850
851 LOG(3, s, t, "LCP: send %s\n", ppp_code(*response));
852 if (config->debug > 3) dumplcp(response, l);
853
854 tunnelsend(b, l + (response - b), t);
855 }
856 else if (*p == ConfigNak || *p == ConfigRej)
857 {
858 int x = l - 4;
859 uint8_t *o = (p + 4);
860 int authtype = -1;
861
862 while (x > 2)
863 {
864 int type = o[0];
865 int length = o[1];
866
867 if (length == 0 || type == 0 || x < length) break;
868 switch (type)
869 {
870 case 1: // Maximum-Receive-Unit
871 if (*p == ConfigNak)
872 {
873 if (length < 4) break;
874 sess_local[s].ppp_mru = ntohs(*(uint16_t *)(o + 2));
875 LOG(3, s, t, " Remote requested MRU of %u\n", sess_local[s].ppp_mru);
876 }
877 else
878 {
879 sess_local[s].ppp_mru = 0;
880 LOG(3, s, t, " Remote rejected MRU negotiation\n");
881 }
882
883 break;
884
885 case 3: // Authentication-Protocol
886 if (authtype > 0)
887 break;
888
889 if (*p == ConfigNak)
890 {
891 int proto;
892
893 if (length < 4) break;
894 proto = ntohs(*(uint16_t *)(o + 2));
895
896 if (proto == PPPPAP)
897 {
898 authtype = config->radius_authtypes & AUTHPAP;
899 LOG(3, s, t, " Remote requested PAP authentication...%sing\n",
900 authtype ? "accept" : "reject");
901 }
902 else if (proto == PPPCHAP && length > 4 && *(o + 4) == 5)
903 {
904 authtype = config->radius_authtypes & AUTHCHAP;
905 LOG(3, s, t, " Remote requested CHAP authentication...%sing\n",
906 authtype ? "accept" : "reject");
907 }
908 else
909 {
910 LOG(3, s, t, " Rejecting unsupported authentication %#4x\n",
911 proto);
912 }
913 }
914 else
915 {
916 LOG(2, s, t, "LCP: remote rejected auth negotiation\n");
917 authtype = 0; // shutdown
918 }
919
920 break;
921
922 case 5: // Magic-Number
923 session[s].magic = 0;
924 if (*p == ConfigNak)
925 {
926 if (length < 6) break;
927 session[s].magic = ntohl(*(uint32_t *)(o + 2));
928 }
929
930 if (session[s].magic)
931 LOG(3, s, t, " Remote requested magic-no %x\n", session[s].magic);
932 else
933 LOG(3, s, t, " Remote rejected magic-no\n");
934
935 cluster_send_session(s);
936 break;
937
938 case 17: // Multilink Max-Receive-Reconstructed-Unit
939 {
940 if (*p == ConfigNak)
941 {
942 sess_local[s].mp_mrru = ntohs(*(uint16_t *)(o + 2));
943 LOG(3, s, t, " Remote requested MRRU of %u\n", sess_local[s].mp_mrru);
944 }
945 else
946 {
947 sess_local[s].mp_mrru = 0;
948 LOG(3, s, t, " Remote rejected MRRU negotiation\n");
949 }
950 }
951 break;
952
953 case 18: // Multilink Short Sequence Number Header Format
954 {
955 if (*p == ConfigNak)
956 {
957 sess_local[s].mp_mssf = 0;
958 LOG(3, s, t, " Remote requested Naked mssf\n");
959 }
960 else
961 {
962 sess_local[s].mp_mssf = 0;
963 LOG(3, s, t, " Remote rejected mssf\n");
964 }
965 }
966 break;
967
968 case 19: // Multilink Endpoint Discriminator
969 {
970 if (*p == ConfigNak)
971 {
972 LOG(2, s, t, " Remote should not configNak Endpoint Dis!\n");
973 }
974 else
975 {
976 sess_local[s].mp_epdis = 0;
977 LOG(3, s, t, " Remote rejected Endpoint Discriminator\n");
978 }
979 }
980 break;
981
982 default:
983 LOG(2, s, t, "LCP: remote sent %s for type %u?\n", ppp_code(*p), type);
984 sessionshutdown(s, "Unable to negotiate LCP.", CDN_ADMIN_DISC, TERM_USER_ERROR);
985 return;
986 }
987 x -= length;
988 o += length;
989 }
990
991 if (!authtype)
992 {
993 sessionshutdown(s, "Unsupported authentication.", CDN_ADMIN_DISC, TERM_USER_ERROR);
994 return;
995 }
996
997 if (authtype > 0)
998 sess_local[s].lcp_authtype = authtype;
999
1000 switch (session[s].ppp.lcp)
1001 {
1002 case Closed:
1003 case Stopped:
1004 {
1005 uint8_t *response = makeppp(b, sizeof(b), p, 2, s, t, PPPLCP, 0, 0, 0);
1006 if (!response) return;
1007 *response = TerminateAck;
1008 *((uint16_t *) (response + 2)) = htons(l = 4);
1009
1010 LOG(3, s, t, "LCP: send %s\n", ppp_code(*response));
1011 if (config->debug > 3) dumplcp(response, l);
1012
1013 tunnelsend(b, l + (response - b), t);
1014 }
1015 break;
1016
1017 case RequestSent:
1018 case AckSent:
1019 initialise_restart_count(s, lcp);
1020 sendlcp(s, t);
1021 break;
1022
1023 case AckReceived:
1024 LOG(2, s, t, "LCP: ConfigNak in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.lcp));
1025 sendlcp(s, t);
1026 break;
1027
1028 case Opened:
1029 lcp_restart(s);
1030 sendlcp(s, t);
1031 break;
1032
1033 default:
1034 LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp));
1035 return;
1036 }
1037 }
1038 else if (*p == TerminateReq)
1039 {
1040 switch (session[s].ppp.lcp)
1041 {
1042 case Closed:
1043 case Stopped:
1044 case Closing:
1045 case Stopping:
1046 case RequestSent:
1047 case AckReceived:
1048 case AckSent:
1049 break;
1050
1051 case Opened:
1052 lcp_restart(s);
1053 zero_restart_count(s, lcp);
1054 change_state(s, lcp, Closing);
1055 break;
1056
1057 default:
1058 LOG(2, s, t, "LCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.lcp));
1059 return;
1060 }
1061
1062 *p = TerminateAck; // send ack
1063 q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0);
1064 if (!q) return;
1065
1066 LOG(3, s, t, "LCP: send %s\n", ppp_code(*q));
1067 if (config->debug > 3) dumplcp(q, l);
1068
1069 tunnelsend(b, l + (q - b), t); // send it
1070 }
1071 else if (*p == ProtocolRej)
1072 {
1073 uint16_t proto = 0;
1074
1075 if (l > 4)
1076 {
1077 proto = *(p+4);
1078 if (l > 5 && !(proto & 1))
1079 {
1080 proto <<= 8;
1081 proto |= *(p+5);
1082 }
1083 }
1084
1085 if (proto == PPPIPV6CP)
1086 {
1087 LOG(3, s, t, "IPv6 rejected\n");
1088 change_state(s, ipv6cp, Closed);
1089 }
1090 else
1091 {
1092 LOG(3, s, t, "LCP protocol reject: 0x%04X\n", proto);
1093 }
1094 }
1095 else if (*p == EchoReq)
1096 {
1097 *p = EchoReply; // reply
1098 *(uint32_t *) (p + 4) = htonl(session[s].magic); // our magic number
1099 q = makeppp(b, sizeof(b), p, l, s, t, PPPLCP, 0, 0, 0);
1100 if (!q) return;
1101
1102 LOG(4, s, t, "LCP: send %s\n", ppp_code(*q));
1103 if (config->debug > 3) dumplcp(q, l);
1104
1105 tunnelsend(b, l + (q - b), t); // send it
1106 }
1107 else if (*p == EchoReply)
1108 {
1109 // Ignore it, last_packet time is set earlier than this.
1110 }
1111 else if (*p != CodeRej)
1112 {
1113 ppp_code_rej(s, t, PPPLCP, "LCP", p, l, b, sizeof(b));
1114 }
1115 }
1116
1117 int join_bundle(sessionidt s)
1118 {
1119 // Search for a bundle to join
1120 bundleidt i;
1121 bundleidt b;
1122 for (i = 1; i < MAXBUNDLE; i++)
1123 {
1124 if (bundle[i].state != BUNDLEFREE)
1125 {
1126 if (epdiscmp(session[s].epdis,bundle[i].epdis) && !strcmp(session[s].user, bundle[i].user))
1127 {
1128 sessionidt first_ses = bundle[i].members[0];
1129 if (bundle[i].mssf != session[s].mssf)
1130 {
1131 // uniformity of sequence number format must be insured
1132 LOG(3, s, session[s].tunnel, "MPPP: unable to bundle session %d in bundle %d cause of different mssf\n", s, i);
1133 return -1;
1134 }
1135 session[s].bundle = i;
1136 session[s].ip = session[first_ses].ip;
1137 session[s].dns1 = session[first_ses].dns1;
1138 session[s].dns2 = session[first_ses].dns2;
1139 session[s].timeout = session[first_ses].timeout;
1140
1141 if(session[s].epdis.length > 0)
1142 setepdis(&bundle[i].epdis, session[s].epdis);
1143
1144 strcpy(bundle[i].user, session[s].user);
1145 bundle[i].members[bundle[i].num_of_links] = s;
1146 bundle[i].num_of_links++;
1147 LOG(3, s, session[s].tunnel, "MPPP: Bundling additional line in bundle (%d), lines:%d\n",i,bundle[i].num_of_links);
1148 return i;
1149 }
1150 }
1151 }
1152
1153 // No previously created bundle was found for this session, so create a new one
1154 if (!(b = new_bundle())) return 0;
1155
1156 session[s].bundle = b;
1157 bundle[b].mrru = session[s].mrru;
1158 bundle[b].mssf = session[s].mssf;
1159 // FIXME !!! to enable l2tpns reading mssf frames receiver_max_seq, sender_max_seq must be introduce
1160 // 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
1161 /*
1162 if (bundle[b].mssf)
1163 bundle[b].max_seq = 1 << 12;
1164 else */
1165 bundle[b].max_seq = 1 << 24;
1166 if(session[s].epdis.length > 0)
1167 setepdis(&bundle[b].epdis, session[s].epdis);
1168
1169 strcpy(bundle[b].user, session[s].user);
1170 bundle[b].members[0] = s;
1171 bundle[b].timeout = session[s].timeout;
1172 LOG(3, s, session[s].tunnel, "MPPP: Created a new bundle (%d)\n", b);
1173 return b;
1174 }
1175
1176 static int epdiscmp(epdist ep1, epdist ep2)
1177 {
1178 int ad;
1179 if (ep1.length != ep2.length)
1180 return 0;
1181
1182 if (ep1.addr_class != ep2.addr_class)
1183 return 0;
1184
1185 for (ad = 0; ad < ep1.length; ad++)
1186 if (ep1.address[ad] != ep2.address[ad])
1187 return 0;
1188
1189 return 1;
1190 }
1191
1192 static void setepdis(epdist *ep1, epdist ep2)
1193 {
1194 int ad;
1195 ep1->length = ep2.length;
1196 ep1->addr_class = ep2.addr_class;
1197 for (ad = 0; ad < ep2.length; ad++)
1198 ep1->address[ad] = ep2.address[ad];
1199 }
1200
1201 static bundleidt new_bundle()
1202 {
1203 bundleidt i;
1204 for (i = 1; i < MAXBUNDLE; i++)
1205 {
1206 if (bundle[i].state == BUNDLEFREE)
1207 {
1208 LOG(4, 0, 0, "MPPP: Assigning bundle ID %d\n", i);
1209 bundle[i].num_of_links = 1;
1210 bundle[i].last_check = time_now; // Initialize last_check value
1211 bundle[i].state = BUNDLEOPEN;
1212 bundle[i].current_ses = -1; // This is to enforce the first session 0 to be used at first
1213 memset(&frag[i], 0, sizeof(fragmentationt));
1214 if (i > config->cluster_highest_bundleid)
1215 config->cluster_highest_bundleid = i;
1216 return i;
1217 }
1218 }
1219 LOG(0, 0, 0, "MPPP: Can't find a free bundle! There shouldn't be this many in use!\n");
1220 return 0;
1221 }
1222
1223 static void ipcp_open(sessionidt s, tunnelidt t)
1224 {
1225 LOG(3, s, t, "IPCP: Opened, session is now active\n");
1226
1227 change_state(s, ipcp, Opened);
1228
1229 if (!(session[s].walled_garden || session[s].flags & SESSION_STARTED))
1230 {
1231 uint16_t r = radiusnew(s);
1232 if (r)
1233 {
1234 radiussend(r, RADIUSSTART); // send radius start
1235
1236 // don't send further Start records if IPCP is restarted
1237 session[s].flags |= SESSION_STARTED;
1238 cluster_send_session(s);
1239 }
1240 }
1241
1242 // start IPv6 if configured and still in passive state
1243 if (session[s].ppp.ipv6cp == Stopped)
1244 {
1245 sendipv6cp(s, t);
1246 change_state(s, ipv6cp, RequestSent);
1247 }
1248 }
1249
1250 // Process IPCP messages
1251 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
1252 {
1253 uint8_t b[MAXETHER];
1254 uint8_t *q = 0;
1255 uint16_t hl;
1256
1257 CSTAT(processipcp);
1258
1259 LOG_HEX(5, "IPCP", p, l);
1260 if (l < 4)
1261 {
1262 LOG(1, s, t, "Short IPCP %d bytes\n", l);
1263 STAT(tunnel_rx_errors);
1264 return ;
1265 }
1266
1267 if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
1268 {
1269 LOG(1, s, t, "Length mismatch IPCP %u/%u\n", hl, l);
1270 STAT(tunnel_rx_errors);
1271 return ;
1272 }
1273 l = hl;
1274
1275 if (session[s].ppp.phase < Network)
1276 {
1277 LOG(2, s, t, "IPCP %s ignored in %s phase\n", ppp_code(*p), ppp_phase(session[s].ppp.phase));
1278 return;
1279 }
1280
1281 LOG(3, s, t, "IPCP: recv %s\n", ppp_code(*p));
1282
1283 if (*p == ConfigAck)
1284 {
1285 switch (session[s].ppp.ipcp)
1286 {
1287 case RequestSent:
1288 initialise_restart_count(s, ipcp);
1289 change_state(s, ipcp, AckReceived);
1290 break;
1291
1292 case AckReceived:
1293 case Opened:
1294 LOG(2, s, t, "IPCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.ipcp));
1295 sendipcp(s, t);
1296 change_state(s, ipcp, RequestSent);
1297 break;
1298
1299 case AckSent:
1300 ipcp_open(s, t);
1301 break;
1302
1303 default:
1304 LOG(2, s, t, "IPCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipcp));
1305 }
1306 }
1307 else if (*p == ConfigReq)
1308 {
1309 uint8_t *response = 0;
1310 uint8_t *o = p + 4;
1311 int length = l - 4;
1312 int gotip = 0;
1313 in_addr_t addr;
1314
1315 while (length > 2)
1316 {
1317 if (!o[1] || o[1] > length) return;
1318
1319 switch (*o)
1320 {
1321 case 3: // ip address
1322 gotip++; // seen address
1323 if (o[1] != 6) return;
1324
1325 addr = htonl(session[s].ip);
1326 if (memcmp(o + 2, &addr, (sizeof addr)))
1327 {
1328 uint8_t *oq = q;
1329 q = ppp_conf_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr));
1330 if (!q || (q != oq && *response == ConfigRej))
1331 {
1332 sessionshutdown(s, "Can't negotiate IPCP.", CDN_ADMIN_DISC, TERM_USER_ERROR);
1333 return;
1334 }
1335 }
1336
1337 break;
1338
1339 case 129: // primary DNS
1340 if (o[1] != 6) return;
1341
1342 addr = htonl(session[s].dns1);
1343 if (memcmp(o + 2, &addr, (sizeof addr)))
1344 {
1345 q = ppp_conf_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr));
1346 if (!q) return;
1347 }
1348
1349 break;
1350
1351 case 131: // secondary DNS
1352 if (o[1] != 6) return;
1353
1354 addr = htonl(session[s].dns2);
1355 if (memcmp(o + 2, &addr, sizeof(addr)))
1356 {
1357 q = ppp_conf_nak(s, b, sizeof(b), PPPIPCP, &response, q, p, o, (uint8_t *) &addr, sizeof(addr));
1358 if (!q) return;
1359 }
1360
1361 break;
1362
1363 default:
1364 LOG(2, s, t, " Rejecting PPP IPCP Option type %d\n", *o);
1365 q = ppp_conf_rej(s, b, sizeof(b), PPPIPCP, &response, q, p, o);
1366 if (!q) return;
1367 }
1368
1369 length -= o[1];
1370 o += o[1];
1371 }
1372
1373 if (response)
1374 {
1375 l = q - response; // IPCP packet length
1376 *((uint16_t *) (response + 2)) = htons(l); // update header
1377 }
1378 else if (gotip)
1379 {
1380 // Send packet back as ConfigAck
1381 response = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP, 0, 0, 0);
1382 if (!response) return;
1383 *response = ConfigAck;
1384 }
1385 else
1386 {
1387 LOG(1, s, t, "No IP in IPCP request\n");
1388 STAT(tunnel_rx_errors);
1389 return;
1390 }
1391
1392 switch (session[s].ppp.ipcp)
1393 {
1394 case Closed:
1395 response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPCP, 0, 0, 0);
1396 if (!response) return;
1397 *response = TerminateAck;
1398 *((uint16_t *) (response + 2)) = htons(l = 4);
1399 break;
1400
1401 case Stopped:
1402 initialise_restart_count(s, ipcp);
1403 sendipcp(s, t);
1404 if (*response == ConfigAck)
1405 change_state(s, ipcp, AckSent);
1406 else
1407 change_state(s, ipcp, RequestSent);
1408
1409 break;
1410
1411 case RequestSent:
1412 if (*response == ConfigAck)
1413 change_state(s, ipcp, AckSent);
1414
1415 break;
1416
1417 case AckReceived:
1418 if (*response == ConfigAck)
1419 ipcp_open(s, t);
1420
1421 break;
1422
1423 case Opened:
1424 initialise_restart_count(s, ipcp);
1425 sendipcp(s, t);
1426 /* fallthrough */
1427
1428 case AckSent:
1429 if (*response == ConfigAck)
1430 change_state(s, ipcp, AckSent);
1431 else
1432 change_state(s, ipcp, RequestSent);
1433
1434 break;
1435
1436 default:
1437 LOG(2, s, t, "IPCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipcp));
1438 return;
1439 }
1440
1441 LOG(3, s, t, "IPCP: send %s\n", ppp_code(*response));
1442 tunnelsend(b, l + (response - b), t);
1443 }
1444 else if (*p == TerminateReq)
1445 {
1446 switch (session[s].ppp.ipcp)
1447 {
1448 case Closed:
1449 case Stopped:
1450 case Closing:
1451 case Stopping:
1452 case RequestSent:
1453 case AckReceived:
1454 case AckSent:
1455 break;
1456
1457 case Opened:
1458 zero_restart_count(s, ipcp);
1459 change_state(s, ipcp, Closing);
1460 break;
1461
1462 default:
1463 LOG(2, s, t, "IPCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipcp));
1464 return;
1465 }
1466
1467 *p = TerminateAck; // send ack
1468 q = makeppp(b, sizeof(b), p, l, s, t, PPPIPCP, 0, 0, 0);
1469 if (!q) return;
1470
1471 LOG(3, s, t, "IPCP: send %s\n", ppp_code(*q));
1472 tunnelsend(b, l + (q - b), t); // send it
1473 }
1474 else if (*p != CodeRej)
1475 {
1476 ppp_code_rej(s, t, PPPIPCP, "IPCP", p, l, b, sizeof(b));
1477 }
1478 }
1479
1480 static void ipv6cp_open(sessionidt s, tunnelidt t)
1481 {
1482 int i;
1483 LOG(3, s, t, "IPV6CP: Opened\n");
1484
1485 change_state(s, ipv6cp, Opened);
1486 for (i = 0; i < MAXROUTE6 && session[s].route6[i].ipv6prefixlen; i++)
1487 {
1488 route6set(s, session[s].route6[i].ipv6route, session[s].route6[i].ipv6prefixlen, 1);
1489 }
1490
1491 if (session[s].ipv6address.s6_addr[0])
1492 {
1493 // Check if included in prefix
1494 if (sessionbyipv6(session[s].ipv6address) != s)
1495 route6set(s, session[s].ipv6address, 128, 1);
1496 }
1497
1498 // Send an initial RA (TODO: Should we send these regularly?)
1499 send_ipv6_ra(s, t, NULL);
1500 }
1501
1502 // Process IPV6CP messages
1503 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
1504 {
1505 uint8_t b[MAXETHER];
1506 uint8_t *q = 0;
1507 uint16_t hl;
1508
1509 CSTAT(processipv6cp);
1510
1511 LOG_HEX(5, "IPV6CP", p, l);
1512 if (l < 4)
1513 {
1514 LOG(1, s, t, "Short IPV6CP %d bytes\n", l);
1515 STAT(tunnel_rx_errors);
1516 return ;
1517 }
1518
1519 if ((hl = ntohs(*(uint16_t *) (p + 2))) > l)
1520 {
1521 LOG(1, s, t, "Length mismatch IPV6CP %u/%u\n", hl, l);
1522 STAT(tunnel_rx_errors);
1523 return ;
1524 }
1525 l = hl;
1526
1527 if (session[s].ppp.phase < Network)
1528 {
1529 LOG(2, s, t, "IPV6CP %s ignored in %s phase\n", ppp_code(*p), ppp_phase(session[s].ppp.phase));
1530 return;
1531 }
1532
1533 LOG(3, s, t, "IPV6CP: recv %s\n", ppp_code(*p));
1534
1535 if (!session[s].ip)
1536 {
1537 LOG(3, s, t, "IPV6CP: no IPv4 address (IPCP in state %s)\n", ppp_state(session[s].ppp.ipcp));
1538 return; // need IPCP to complete...
1539 }
1540
1541 if (*p == ConfigAck)
1542 {
1543 switch (session[s].ppp.ipv6cp)
1544 {
1545 case RequestSent:
1546 initialise_restart_count(s, ipv6cp);
1547 change_state(s, ipv6cp, AckReceived);
1548 break;
1549
1550 case AckReceived:
1551 case Opened:
1552 LOG(2, s, t, "IPV6CP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.ipv6cp));
1553 sendipv6cp(s, t);
1554 change_state(s, ipv6cp, RequestSent);
1555 break;
1556
1557 case AckSent:
1558 ipv6cp_open(s, t);
1559 break;
1560
1561 default:
1562 LOG(2, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp));
1563 }
1564 }
1565 else if (*p == ConfigReq)
1566 {
1567 uint8_t *response = 0;
1568 uint8_t *o = p + 4;
1569 int length = l - 4;
1570 int gotip = 0;
1571 uint32_t ident[2];
1572
1573 while (length > 2)
1574 {
1575 if (!o[1] || o[1] > length) return;
1576
1577 switch (*o)
1578 {
1579 case 1: // interface identifier
1580 gotip++; // seen address
1581 if (o[1] != 10) return;
1582
1583 ident[0] = htonl(session[s].ip);
1584 ident[1] = 0;
1585
1586 if (memcmp(o + 2, ident, sizeof(ident)))
1587 {
1588 q = ppp_conf_nak(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o, (uint8_t *)ident, sizeof(ident));
1589 if (!q) return;
1590 }
1591
1592 break;
1593
1594 default:
1595 LOG(2, s, t, " Rejecting PPP IPV6CP Option type %d\n", *o);
1596 q = ppp_conf_rej(s, b, sizeof(b), PPPIPV6CP, &response, q, p, o);
1597 if (!q) return;
1598 }
1599
1600 length -= o[1];
1601 o += o[1];
1602 }
1603
1604 if (response)
1605 {
1606 l = q - response; // IPV6CP packet length
1607 *((uint16_t *) (response + 2)) = htons(l); // update header
1608 }
1609 else if (gotip)
1610 {
1611 // Send packet back as ConfigAck
1612 response = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP, 0, 0, 0);
1613 if (!response) return;
1614 *response = ConfigAck;
1615 }
1616 else
1617 {
1618 LOG(1, s, t, "No interface identifier in IPV6CP request\n");
1619 STAT(tunnel_rx_errors);
1620 return;
1621 }
1622
1623 switch (session[s].ppp.ipv6cp)
1624 {
1625 case Closed:
1626 response = makeppp(b, sizeof(b), p, 2, s, t, PPPIPV6CP, 0, 0, 0);
1627 if (!response) return;
1628 *response = TerminateAck;
1629 *((uint16_t *) (response + 2)) = htons(l = 4);
1630 break;
1631
1632 case Stopped:
1633 initialise_restart_count(s, ipv6cp);
1634 sendipv6cp(s, t);
1635 if (*response == ConfigAck)
1636 change_state(s, ipv6cp, AckSent);
1637 else
1638 change_state(s, ipv6cp, RequestSent);
1639
1640 break;
1641
1642 case RequestSent:
1643 if (*response == ConfigAck)
1644 change_state(s, ipv6cp, AckSent);
1645
1646 break;
1647
1648 case AckReceived:
1649 if (*response == ConfigAck)
1650 ipv6cp_open(s, t);
1651
1652 break;
1653
1654 case Opened:
1655 initialise_restart_count(s, ipv6cp);
1656 sendipv6cp(s, t);
1657 /* fallthrough */
1658
1659 case AckSent:
1660 if (*response == ConfigAck)
1661 change_state(s, ipv6cp, AckSent);
1662 else
1663 change_state(s, ipv6cp, RequestSent);
1664
1665 break;
1666
1667 default:
1668 LOG(2, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp));
1669 return;
1670 }
1671
1672 LOG(3, s, t, "IPV6CP: send %s\n", ppp_code(*response));
1673 tunnelsend(b, l + (response - b), t);
1674 }
1675 else if (*p == TerminateReq)
1676 {
1677 switch (session[s].ppp.ipv6cp)
1678 {
1679 case Closed:
1680 case Stopped:
1681 case Closing:
1682 case Stopping:
1683 case RequestSent:
1684 case AckReceived:
1685 case AckSent:
1686 break;
1687
1688 case Opened:
1689 zero_restart_count(s, ipv6cp);
1690 change_state(s, ipv6cp, Closing);
1691 break;
1692
1693 default:
1694 LOG(2, s, t, "IPV6CP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ipv6cp));
1695 return;
1696 }
1697
1698 *p = TerminateAck; // send ack
1699 q = makeppp(b, sizeof(b), p, l, s, t, PPPIPV6CP, 0, 0, 0);
1700 if (!q) return;
1701
1702 LOG(3, s, t, "IPV6CP: send %s\n", ppp_code(*q));
1703 tunnelsend(b, l + (q - b), t); // send it
1704 }
1705 else if (*p != CodeRej)
1706 {
1707 ppp_code_rej(s, t, PPPIPV6CP, "IPV6CP", p, l, b, sizeof(b));
1708 }
1709 }
1710
1711 static void update_sessions_in_stat(sessionidt s, uint16_t l)
1712 {
1713 bundleidt b = session[s].bundle;
1714 if (!b)
1715 {
1716 increment_counter(&session[s].cin, &session[s].cin_wrap, l);
1717 session[s].cin_delta += l;
1718 session[s].pin++;
1719
1720 sess_local[s].cin += l;
1721 sess_local[s].pin++;
1722 }
1723 else
1724 {
1725 int i = frag[b].re_frame_begin_index;
1726 int end = frag[b].re_frame_end_index;
1727 for (;;)
1728 {
1729 l = frag[b].fragment[i].length;
1730 s = frag[b].fragment[i].sid;
1731 increment_counter(&session[s].cin, &session[s].cin_wrap, l);
1732 session[s].cin_delta += l;
1733 session[s].pin++;
1734
1735 sess_local[s].cin += l;
1736 sess_local[s].pin++;
1737 if (i == end)
1738 return;
1739 i = (i + 1) & MAXFRAGNUM_MASK;
1740 }
1741 }
1742 }
1743
1744 // process IP packet received
1745 //
1746 // This MUST be called with at least 4 byte behind 'p'.
1747 // (i.e. this routine writes to p[-4]).
1748 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
1749 {
1750 in_addr_t ip, ip_dst;
1751
1752 CSTAT(processipin);
1753
1754 LOG_HEX(5, "IP", p, l);
1755
1756 if (l < 20)
1757 {
1758 LOG(1, s, t, "IP packet too short %d\n", l);
1759 STAT(tunnel_rx_errors);
1760 return ;
1761 }
1762
1763 ip = ntohl(*(uint32_t *)(p + 12));
1764 ip_dst = *(uint32_t *)(p + 16);
1765
1766 if (l > MAXETHER)
1767 {
1768 LOG(1, s, t, "IP packet too long %d\n", l);
1769 STAT(tunnel_rx_errors);
1770 return ;
1771 }
1772
1773 if (session[s].ppp.phase != Network || session[s].ppp.ipcp != Opened)
1774 return;
1775
1776 if (!session[s].bundle || bundle[session[s].bundle].num_of_links < 2) // FIXME:
1777 {
1778 // no spoof (do sessionbyip to handled statically routed subnets)
1779 if (!config->disable_no_spoof && ip != session[s].ip && sessionbyip(htonl(ip)) != s)
1780 {
1781 LOG(4, s, t, "Dropping packet with spoofed IP %s\n", fmtaddr(htonl(ip), 0));
1782 return;
1783 }
1784 }
1785
1786 // run access-list if any
1787 if (session[s].filter_in && !ip_filter(p, l, session[s].filter_in - 1))
1788 return;
1789
1790 // adjust MSS on SYN and SYN,ACK packets with options
1791 if ((ntohs(*(uint16_t *) (p + 6)) & 0x1fff) == 0 && p[9] == IPPROTO_TCP) // first tcp fragment
1792 {
1793 int ihl = (p[0] & 0xf) * 4; // length of IP header
1794 if (l >= ihl + 20 && (p[ihl + 13] & TCP_FLAG_SYN) && ((p[ihl + 12] >> 4) > 5))
1795 adjust_tcp_mss(s, t, p, l, p + ihl);
1796 }
1797
1798 // Add on the tun header
1799 p -= 4;
1800 *(uint32_t *) p = htonl(PKTIP);
1801 l += 4;
1802
1803 if (session[s].tbf_in)
1804 {
1805 if (!config->no_throttle_local_IP || !sessionbyip(ip_dst))
1806 {
1807 // Are we throttling this session?
1808 if (config->cluster_iam_master)
1809 tbf_queue_packet(session[s].tbf_in, p, l);
1810 else
1811 master_throttle_packet(session[s].tbf_in, p, l);
1812 return;
1813 }
1814 }
1815
1816 // send to ethernet
1817 if (tun_write(p, l) < 0)
1818 {
1819 STAT(tun_tx_errors);
1820 LOG(0, s, t, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
1821 l, strerror(errno), tunfd, p);
1822
1823 return;
1824 }
1825
1826 p += 4;
1827 l -= 4;
1828
1829 if (session[s].snoop_ip && session[s].snoop_port)
1830 {
1831 // Snooping this session
1832 snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port);
1833 }
1834
1835 update_sessions_in_stat(s, l);
1836
1837 eth_tx += l;
1838
1839 STAT(tun_tx_packets);
1840 INC_STAT(tun_tx_bytes, l);
1841 }
1842
1843 // process Multilink PPP packet received
1844 void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
1845 {
1846 bundleidt b = session[s].bundle;
1847 bundlet * this_bundle = &bundle[b];
1848 uint32_t maskSeq, max_seq;
1849 int frag_offset;
1850 uint16_t frag_index, frag_index_next, frag_index_prev;
1851 fragmentationt *this_fragmentation = &frag[b];
1852 uint8_t begin_frame = (*p & MP_BEGIN);
1853 uint8_t end_frame = (*p & MP_END);
1854 uint32_t seq_num, seq_num_next, seq_num_prev;
1855 uint32_t i;
1856 uint8_t flags = *p;
1857 uint16_t begin_index, end_index;
1858
1859 // Perform length checking
1860 if(l > MAXFRAGLEN)
1861 {
1862 LOG(2, s, t, "MPPP: discarding fragment larger than MAXFRAGLEN\n");
1863 return;
1864 }
1865
1866 if(!b)
1867 {
1868 LOG(2, s, t, "MPPP: Invalid bundle id: 0\n");
1869 return;
1870 }
1871 // FIXME !! session[s].mssf means that the receiver wants to receive frames in mssf not means the receiver will send frames in mssf
1872 /* if(session[s].mssf)
1873 {
1874 // Get 12 bit for seq number
1875 seq_num = ntohs((*(uint16_t *) p) & 0xFF0F);
1876 p += 2;
1877 l -= 2;
1878 // After this point the pointer should be advanced 2 bytes
1879 LOG(3, s, t, "MPPP: 12 bits, sequence number: %d\n",seq_num);
1880 }
1881 else */
1882 {
1883 // Get 24 bit for seq number
1884 seq_num = ntohl((*(uint32_t *) p) & 0xFFFFFF00);
1885 p += 4;
1886 l -= 4;
1887 // After this point the pointer should be advanced 4 bytes
1888 LOG(4, s, t, "MPPP: 24 bits sequence number:%d\n",seq_num);
1889 }
1890
1891 max_seq = this_bundle->max_seq;
1892 maskSeq = max_seq - 1;
1893
1894 /*
1895 * Expand sequence number to 32 bits, making it as close
1896 * as possible to this_fragmentation->M.
1897 */
1898 seq_num |= this_fragmentation->M & ~maskSeq;
1899 if ((int)(this_fragmentation->M - seq_num) > (int)(maskSeq >> 1))
1900 {
1901 seq_num += maskSeq + 1;
1902 }
1903 else if ((int)(seq_num - this_fragmentation->M) > (int)(maskSeq >> 1))
1904 {
1905 seq_num -= maskSeq + 1; /* should never happen */
1906 }
1907
1908 // calculate this fragment's offset from the begin seq in the bundle
1909 frag_offset = (int) (seq_num - this_fragmentation->start_seq);
1910
1911 sess_local[s].last_seq = seq_num;
1912
1913 // calculate the jitter average
1914 uint32_t ljitter = time_now_ms - sess_local[s].prev_time;
1915 if (ljitter > 0)
1916 {
1917 sess_local[s].jitteravg = (sess_local[s].jitteravg + ljitter)>>1;
1918 sess_local[s].prev_time = time_now_ms;
1919 }
1920
1921 uint32_t Mmin;
1922
1923 if (seq_num < this_fragmentation->M)
1924 {
1925 Mmin = seq_num;
1926 this_fragmentation->M = seq_num;
1927 }
1928 else
1929 {
1930 Mmin = sess_local[(this_bundle->members[0])].last_seq;
1931 for (i = 1; i < this_bundle->num_of_links; i++)
1932 {
1933 uint32_t s_seq = sess_local[(this_bundle->members[i])].last_seq;
1934 if (s_seq < Mmin)
1935 Mmin = s_seq;
1936 }
1937 this_fragmentation->M = Mmin;
1938 }
1939
1940 // calculate M offset of the M seq in the bundle
1941 int M_offset = (int) (Mmin - this_fragmentation->start_seq);
1942
1943 if (M_offset >= MAXFRAGNUM)
1944 {
1945 // There have a long break of the link !!!!!!!!
1946 // M_offset is bigger that the fragmentation buffer size
1947 LOG(3, s, t, "MPPP: M_offset out of range, min:%d, begin_seq:%d\n", Mmin, this_fragmentation->start_seq);
1948
1949 // Calculate the new start index, the previous frag are lost
1950 begin_index = (M_offset + this_fragmentation->start_index) & MAXFRAGNUM_MASK;
1951
1952 // Set new Start sequence
1953 this_fragmentation->start_index = begin_index;
1954 this_fragmentation->start_seq = Mmin;
1955 M_offset = 0;
1956 // recalculate the fragment offset from the new begin seq in the bundle
1957 frag_offset = (int) (seq_num - Mmin);
1958 }
1959
1960 // discard this fragment if the packet comes before the start sequence
1961 if (frag_offset < 0)
1962 {
1963 // this packet comes before the next
1964 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);
1965 return;
1966 }
1967
1968 // discard if frag_offset is bigger that the fragmentation buffer size
1969 if (frag_offset >= MAXFRAGNUM)
1970 {
1971 // frag_offset is bigger that the fragmentation buffer size
1972 LOG(3, s, t, "MPPP: Index out of range, seq:%d, begin_seq:%d\n", seq_num, this_fragmentation->start_seq);
1973 return;
1974 }
1975
1976 //caculate received fragment's index in the fragment array
1977 frag_index = (frag_offset + this_fragmentation->start_index) & MAXFRAGNUM_MASK;
1978
1979 // insert the frame in it's place
1980 fragmentt *this_frag = &this_fragmentation->fragment[frag_index];
1981
1982 if (this_frag->length > 0)
1983 // This fragment is lost, It was around the buffer and it was never completed the packet.
1984 LOG(3, this_frag->sid, this_frag->tid, "MPPP: (INSERT) seq_num:%d frag_index:%d flags:%02X is LOST\n",
1985 this_frag->seq, frag_index, this_frag->flags);
1986
1987 this_frag->length = l;
1988 this_frag->sid = s;
1989 this_frag->tid = t;
1990 this_frag->flags = flags;
1991 this_frag->seq = seq_num;
1992 this_frag->jitteravg = sess_local[s].jitteravg;
1993 memcpy(this_frag->data, p, l);
1994
1995 LOG(4, s, t, "MPPP: seq_num:%d frag_index:%d INSERTED flags: %02X\n", seq_num, frag_index, flags);
1996
1997 //next frag index
1998 frag_index_next = (frag_index + 1) & MAXFRAGNUM_MASK;
1999 //previous frag index
2000 frag_index_prev = (frag_index - 1) & MAXFRAGNUM_MASK;
2001 // next seq
2002 seq_num_next = seq_num + 1;
2003 // previous seq
2004 seq_num_prev = seq_num - 1;
2005
2006 // Clean the buffer and log the lost fragments
2007 if ((frag_index_next != this_fragmentation->start_index) && this_fragmentation->fragment[frag_index_next].length)
2008 {
2009 // check if the next frag is a lost fragment
2010 if (this_fragmentation->fragment[frag_index_next].seq != seq_num_next)
2011 {
2012 // This fragment is lost, It was around the buffer and it was never completed the packet.
2013 LOG(3, this_fragmentation->fragment[frag_index_next].sid, this_fragmentation->fragment[frag_index_next].tid,
2014 "MPPP: (NEXT) seq_num:%d frag_index:%d flags:%02X is LOST\n",
2015 this_fragmentation->fragment[frag_index_next].seq, frag_index_next,
2016 this_fragmentation->fragment[frag_index_next].flags);
2017 // this frag is lost
2018 this_fragmentation->fragment[frag_index_next].length = 0;
2019 this_fragmentation->fragment[frag_index_next].flags = 0;
2020
2021 if (begin_frame && (!end_frame)) return; // assembling frame failed
2022 }
2023 }
2024
2025 // Clean the buffer and log the lost fragments
2026 if ((frag_index != this_fragmentation->start_index) && this_fragmentation->fragment[frag_index_prev].length)
2027 {
2028 // check if the next frag is a lost fragment
2029 if (this_fragmentation->fragment[frag_index_prev].seq != seq_num_prev)
2030 {
2031 // This fragment is lost, It was around the buffer and it was never completed the packet.
2032 LOG(3, this_fragmentation->fragment[frag_index_prev].sid, this_fragmentation->fragment[frag_index_prev].tid,
2033 "MPPP: (PREV) seq_num:%d frag_index:%d flags:%02X is LOST\n",
2034 this_fragmentation->fragment[frag_index_prev].seq, frag_index_prev,
2035 this_fragmentation->fragment[frag_index_prev].flags);
2036
2037 this_fragmentation->fragment[frag_index_prev].length = 0;
2038 this_fragmentation->fragment[frag_index_prev].flags = 0;
2039
2040 if (end_frame && (!begin_frame)) return; // assembling frame failed
2041 }
2042 }
2043
2044 find_frame:
2045 begin_index = this_fragmentation->start_index;
2046 uint32_t b_seq = this_fragmentation->start_seq;
2047 // Try to find a Begin sequence from the start_seq sequence to M sequence
2048 while (b_seq < Mmin)
2049 {
2050 if (this_fragmentation->fragment[begin_index].length)
2051 {
2052 if (b_seq == this_fragmentation->fragment[begin_index].seq)
2053 {
2054 if (this_fragmentation->fragment[begin_index].flags & MP_BEGIN)
2055 {
2056 int isfoundE = 0;
2057 // Adjust the new start sequence and start index
2058 this_fragmentation->start_index = begin_index;
2059 this_fragmentation->start_seq = b_seq;
2060 // Begin Sequence found, now try to found the End Sequence to complete the frame
2061 end_index = begin_index;
2062 while (b_seq < Mmin)
2063 {
2064 if (this_fragmentation->fragment[end_index].length)
2065 {
2066 if (b_seq == this_fragmentation->fragment[end_index].seq)
2067 {
2068 if (this_fragmentation->fragment[end_index].flags & MP_END)
2069 {
2070 // The End sequence was found and the frame is complete
2071 isfoundE = 1;
2072 break;
2073 }
2074 }
2075 else
2076 {
2077 // This fragment is lost, it was never completed the packet.
2078 LOG(3, this_fragmentation->fragment[end_index].sid, this_fragmentation->fragment[end_index].tid,
2079 "MPPP: (FIND END) seq_num:%d frag_index:%d flags:%02X is LOST\n",
2080 this_fragmentation->fragment[end_index].seq, begin_index,
2081 this_fragmentation->fragment[end_index].flags);
2082 // this frag is lost
2083 this_fragmentation->fragment[end_index].length = 0;
2084 this_fragmentation->fragment[end_index].flags = 0;
2085 // This frame is not complete find the next Begin
2086 break;
2087 }
2088 }
2089 else
2090 {
2091 // This frame is not complete find the next Begin if exist
2092 break;
2093 }
2094 end_index = (end_index +1) & MAXFRAGNUM_MASK;
2095 b_seq++;
2096 }
2097
2098 if (isfoundE)
2099 // The End sequence was found and the frame is complete
2100 break;
2101 else
2102 // find the next Begin
2103 begin_index = end_index;
2104 }
2105 }
2106 else
2107 {
2108 // This fragment is lost, it was never completed the packet.
2109 LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid,
2110 "MPPP: (FIND BEGIN) seq_num:%d frag_index:%d flags:%02X is LOST\n",
2111 this_fragmentation->fragment[begin_index].seq, begin_index,
2112 this_fragmentation->fragment[begin_index].flags);
2113 // this frag is lost
2114 this_fragmentation->fragment[begin_index].length = 0;
2115 this_fragmentation->fragment[begin_index].flags = 0;
2116 }
2117 }
2118 begin_index = (begin_index +1) & MAXFRAGNUM_MASK;
2119 b_seq++;
2120 }
2121
2122 assembling_frame:
2123 // try to assemble the frame that has the received fragment as a member
2124 // get the beginning of this frame
2125 begin_index = end_index = this_fragmentation->start_index;
2126 if (this_fragmentation->fragment[begin_index].length)
2127 {
2128 if (!(this_fragmentation->fragment[begin_index].flags & MP_BEGIN))
2129 {
2130 LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid,
2131 "MPPP: (NOT BEGIN) seq_num:%d frag_index:%d flags:%02X\n",
2132 this_fragmentation->fragment[begin_index].seq, begin_index,
2133 this_fragmentation->fragment[begin_index].flags);
2134 // should occur only after an "M_Offset out of range"
2135 // The start sequence must be a begin sequence
2136 this_fragmentation->start_index = (begin_index +1) & MAXFRAGNUM_MASK;
2137 this_fragmentation->start_seq++;
2138 return; // assembling frame failed
2139 }
2140 }
2141 else
2142 return; // assembling frame failed
2143
2144 // get the end of his frame
2145 while (this_fragmentation->fragment[end_index].length)
2146 {
2147 if (this_fragmentation->fragment[end_index].flags & MP_END)
2148 break;
2149
2150 end_index = (end_index +1) & MAXFRAGNUM_MASK;
2151
2152 if (end_index == this_fragmentation->start_index)
2153 return; // assembling frame failed
2154 }
2155
2156 // return if a lost fragment is found
2157 if (!(this_fragmentation->fragment[end_index].length))
2158 return; // assembling frame failed
2159
2160 // assemble the packet
2161 //assemble frame, process it, reset fragmentation
2162 uint16_t cur_len = 4; // This is set to 4 to leave 4 bytes for function processipin
2163
2164 LOG(4, s, t, "MPPP: processing fragments from %d to %d\n", begin_index, end_index);
2165 // Push to the receive buffer
2166
2167 for (i = begin_index;; i = (i + 1) & MAXFRAGNUM_MASK)
2168 {
2169 this_frag = &this_fragmentation->fragment[i];
2170 if(cur_len + this_frag->length > MAXETHER)
2171 {
2172 LOG(2, s, t, "MPPP: discarding reassembled frames larger than MAXETHER\n");
2173 break;
2174 }
2175
2176 memcpy(this_fragmentation->reassembled_frame+cur_len, this_frag->data, this_frag->length);
2177 LOG(5, s, t, "MPPP: processing frame at %d, with len %d\n", i, this_frag->length);
2178
2179 cur_len += this_frag->length;
2180 if (i == end_index)
2181 {
2182 this_fragmentation->re_frame_len = cur_len;
2183 this_fragmentation->re_frame_begin_index = begin_index;
2184 this_fragmentation->re_frame_end_index = end_index;
2185 // Process the resassembled frame
2186 LOG(5, s, t, "MPPP: Process the reassembled frame, len=%d\n",cur_len);
2187 processmpframe(s, t, this_fragmentation->reassembled_frame, this_fragmentation->re_frame_len, 1);
2188 break;
2189 }
2190 }
2191
2192 // Set reassembled frame length to zero after processing it
2193 this_fragmentation->re_frame_len = 0;
2194 for (i = begin_index;; i = (i + 1) & MAXFRAGNUM_MASK)
2195 {
2196 this_fragmentation->fragment[i].length = 0; // Indicates that this fragment has been consumed
2197 this_fragmentation->fragment[i].flags = 0;
2198 if (i == end_index)
2199 break;
2200 }
2201
2202 // Set the new start_index and start_seq
2203 this_fragmentation->start_index = (end_index + 1) & MAXFRAGNUM_MASK;
2204 this_fragmentation->start_seq = this_fragmentation->fragment[end_index].seq + 1;
2205 LOG(4, s, t, "MPPP after assembling: start index is = %d, start seq=%d\n", this_fragmentation->start_index, this_fragmentation->start_seq);
2206
2207 begin_index = this_fragmentation->start_index;
2208 if ((this_fragmentation->fragment[begin_index].length) &&
2209 (this_fragmentation->fragment[begin_index].seq != this_fragmentation->start_seq))
2210 {
2211 LOG(3, this_fragmentation->fragment[begin_index].sid, this_fragmentation->fragment[begin_index].tid,
2212 "MPPP: (START) seq_num:%d frag_index:%d flags:%02X is LOST\n",
2213 this_fragmentation->fragment[begin_index].seq, begin_index,
2214 this_fragmentation->fragment[begin_index].flags);
2215 this_fragmentation->fragment[begin_index].length = 0;
2216 this_fragmentation->fragment[begin_index].flags = 0;
2217 }
2218
2219 if (this_fragmentation->start_seq <= Mmin)
2220 // It's possible to find other complete frame or lost frame.
2221 goto find_frame;
2222 else if ((this_fragmentation->fragment[begin_index].length) &&
2223 (this_fragmentation->fragment[begin_index].flags & MP_BEGIN))
2224 // may be that the next frame is completed
2225 goto assembling_frame;
2226
2227 return;
2228 }
2229
2230 // process IPv6 packet received
2231 //
2232 // This MUST be called with at least 4 byte behind 'p'.
2233 // (i.e. this routine writes to p[-4]).
2234 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
2235 {
2236 struct in6_addr ip;
2237 in_addr_t ipv4;
2238
2239 CSTAT(processipv6in);
2240
2241 LOG_HEX(5, "IPv6", p, l);
2242
2243 ip = *(struct in6_addr *) (p + 8);
2244 ipv4 = ntohl(*(uint32_t *)(p + 16));
2245
2246 if (l > MAXETHER)
2247 {
2248 LOG(1, s, t, "IP packet too long %d\n", l);
2249 STAT(tunnel_rx_errors);
2250 return ;
2251 }
2252
2253 if (session[s].ppp.phase != Network || session[s].ppp.ipv6cp != Opened)
2254 return;
2255
2256 // no spoof
2257 if ((ipv4 != session[s].ip || memcmp(&config->ipv6_prefix, &ip, 8)) && sessionbyipv6(ip) != s)
2258 {
2259 char str[INET6_ADDRSTRLEN];
2260 LOG(5, s, t, "Dropping packet with spoofed IP %s\n",
2261 inet_ntop(AF_INET6, &ip, str, INET6_ADDRSTRLEN));
2262 return;
2263 }
2264
2265 // Check if it's a Router Solicition message.
2266 if (*(p + 6) == 58 && *(p + 7) == 255 && *(p + 24) == 0xFF && *(p + 25) == 2 &&
2267 *(uint32_t *)(p + 26) == 0 && *(uint32_t *)(p + 30) == 0 &&
2268 *(uint32_t *)(p + 34) == 0 &&
2269 *(p + 38) == 0 && *(p + 39) == 2 && *(p + 40) == 133) {
2270 LOG(3, s, t, "Got IPv6 RS\n");
2271 send_ipv6_ra(s, t, &ip);
2272 return;
2273 }
2274
2275 // Check if DhcpV6, IP dst: FF02::1:2, Src Port 0x0222 (546), Dst Port 0x0223 (547)
2276 if (*(p + 6) == 17 && *(p + 24) == 0xFF && *(p + 25) == 2 &&
2277 *(uint32_t *)(p + 26) == 0 && *(uint32_t *)(p + 30) == 0 &&
2278 *(uint16_t *)(p + 34) == 0 && *(p + 36) == 0 && *(p + 37) == 1 && *(p + 38) == 0 && *(p + 39) == 2 &&
2279 *(p + 40) == 2 && *(p + 41) == 0x22 && *(p + 42) == 2 && *(p + 43) == 0x23)
2280 {
2281 dhcpv6_process(s, t, p, l);
2282 return;
2283 }
2284
2285 // Add on the tun header
2286 p -= 4;
2287 *(uint32_t *) p = htonl(PKTIPV6);
2288 l += 4;
2289
2290 // Are we throttled and a slave?
2291 if (session[s].tbf_in && !config->cluster_iam_master) {
2292 // Pass it to the master for handling.
2293 master_throttle_packet(session[s].tbf_in, p, l);
2294 return;
2295 }
2296
2297 // Are we throttled and a master??
2298 if (session[s].tbf_in && config->cluster_iam_master) {
2299 // Actually handle the throttled packets.
2300 tbf_queue_packet(session[s].tbf_in, p, l);
2301 return;
2302 }
2303
2304 // send to ethernet
2305 if (tun_write(p, l) < 0)
2306 {
2307 STAT(tun_tx_errors);
2308 LOG(0, s, t, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
2309 l, strerror(errno), tunfd, p);
2310
2311 return;
2312 }
2313
2314 p += 4;
2315 l -= 4;
2316
2317 if (session[s].snoop_ip && session[s].snoop_port)
2318 {
2319 // Snooping this session
2320 snoop_send_packet(p, l, session[s].snoop_ip, session[s].snoop_port);
2321 }
2322
2323 update_sessions_in_stat(s, l);
2324
2325 eth_tx += l;
2326
2327 STAT(tun_tx_packets);
2328 INC_STAT(tun_tx_bytes, l);
2329 }
2330
2331 //
2332 // Helper routine for the TBF filters.
2333 // Used to send queued data in from the user.
2334 //
2335 void send_ipin(sessionidt s, uint8_t *buf, int len)
2336 {
2337 LOG_HEX(5, "IP in throttled", buf, len);
2338
2339 if (write(tunfd, buf, len) < 0)
2340 {
2341 STAT(tun_tx_errors);
2342 LOG(0, 0, 0, "Error writing %d bytes to TUN device: %s (tunfd=%d, p=%p)\n",
2343 len, strerror(errno), tunfd, buf);
2344
2345 return;
2346 }
2347
2348 buf += 4;
2349 len -= 4;
2350
2351 if (session[s].snoop_ip && session[s].snoop_port)
2352 {
2353 // Snooping this session
2354 snoop_send_packet(buf, len, session[s].snoop_ip, session[s].snoop_port);
2355 }
2356
2357 // Increment packet counters
2358 increment_counter(&session[s].cin, &session[s].cin_wrap, len);
2359 session[s].cin_delta += len;
2360 session[s].pin++;
2361
2362 sess_local[s].cin += len;
2363 sess_local[s].pin++;
2364
2365 eth_tx += len;
2366
2367 STAT(tun_tx_packets);
2368 INC_STAT(tun_tx_bytes, len - 4);
2369 }
2370
2371
2372 // Process CCP messages
2373 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l)
2374 {
2375 uint8_t b[MAXETHER];
2376 uint8_t *q;
2377
2378 CSTAT(processccp);
2379
2380 LOG_HEX(5, "CCP", p, l);
2381
2382 if (session[s].ppp.phase < Network)
2383 {
2384 LOG(2, s, t, "CCP %s ignored in %s phase\n", ppp_code(*p), ppp_phase(session[s].ppp.phase));
2385 return;
2386 }
2387
2388 if (l < 1)
2389 {
2390 LOG(1, s, t, "Short CCP packet\n");
2391 STAT(tunnel_rx_errors);
2392 }
2393
2394 LOG(4, s, t, "CCP: recv %s\n", ppp_code(*p));
2395 if (*p == ConfigAck)
2396 {
2397 switch (session[s].ppp.ccp)
2398 {
2399 case RequestSent:
2400 initialise_restart_count(s, ccp);
2401 change_state(s, ccp, AckReceived);
2402 break;
2403
2404 case AckReceived:
2405 case Opened:
2406 LOG(2, s, t, "CCP: ConfigAck in state %s? Sending ConfigReq\n", ppp_state(session[s].ppp.ccp));
2407 sendccp(s, t);
2408 change_state(s, ccp, RequestSent);
2409 break;
2410
2411 case AckSent:
2412 LOG(3, s, t, "CCP: Opened\n");
2413 change_state(s, ccp, Opened);
2414 break;
2415
2416 default:
2417 LOG(2, s, t, "CCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ccp));
2418 }
2419 }
2420 else if (*p == ConfigReq)
2421 {
2422 if (l < 6) // accept no compression
2423 *p = ConfigAck;
2424 else // compression requested--reject
2425 *p = ConfigRej;
2426
2427 q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP, 0, 0, 0);
2428 if (!q) return;
2429
2430 switch (session[s].ppp.ccp)
2431 {
2432 case Closed:
2433 q = makeppp(b, sizeof(b), p, 2, s, t, PPPCCP, 0, 0, 0);
2434 if (!q) return;
2435 *q = TerminateAck;
2436 *((uint16_t *) (q + 2)) = htons(l = 4);
2437 break;
2438
2439 case Stopped:
2440 initialise_restart_count(s, ccp);
2441 sendccp(s, t);
2442 if (*q == ConfigAck)
2443 change_state(s, ccp, AckSent);
2444 else
2445 change_state(s, ccp, RequestSent);
2446
2447 break;
2448
2449 case RequestSent:
2450 if (*q == ConfigAck)
2451 change_state(s, ccp, AckSent);
2452
2453 break;
2454
2455 case AckReceived:
2456 if (*q == ConfigAck)
2457 change_state(s, ccp, Opened);
2458
2459 break;
2460
2461 case Opened:
2462 initialise_restart_count(s, ccp);
2463 sendccp(s, t);
2464 /* fallthrough */
2465
2466 case AckSent:
2467 if (*q == ConfigAck)
2468 change_state(s, ccp, AckSent);
2469 else
2470 change_state(s, ccp, RequestSent);
2471
2472 break;
2473
2474 default:
2475 LOG(2, s, t, "CCP: ignoring %s in state %s\n", ppp_code(*p), ppp_state(session[s].ppp.ccp));
2476 return;
2477 }
2478
2479 LOG(4, s, t, "CCP: send %s\n", ppp_code(*q));
2480 tunnelsend(b, l + (q - b), t);
2481 }
2482 else if (*p == TerminateReq)
2483 {
2484 *p = TerminateAck;
2485 q = makeppp(b, sizeof(b), p, l, s, t, PPPCCP, 0, 0, 0);
2486 if (!q) return;
2487 LOG(3, s, t, "CCP: send %s\n", ppp_code(*q));
2488 tunnelsend(b, l + (q - b), t);
2489 change_state(s, ccp, Stopped);
2490 }
2491 else if (*p != CodeRej)
2492 {
2493 ppp_code_rej(s, t, PPPCCP, "CCP", p, l, b, sizeof(b));
2494 }
2495 }
2496
2497 // send a CHAP challenge
2498 void sendchap(sessionidt s, tunnelidt t)
2499 {
2500 uint8_t b[MAXETHER];
2501 uint16_t r;
2502 uint8_t *q;
2503
2504 CSTAT(sendchap);
2505
2506 r = radiusnew(s);
2507 if (!r)
2508 {
2509 LOG(1, s, t, "No RADIUS to send challenge\n");
2510 STAT(tunnel_tx_errors);
2511 return;
2512 }
2513
2514 LOG(1, s, t, "Send CHAP challenge\n");
2515
2516 radius[r].chap = 1; // CHAP not PAP
2517 radius[r].id++;
2518 if (radius[r].state != RADIUSCHAP)
2519 radius[r].try = 0;
2520
2521 radius[r].state = RADIUSCHAP;
2522 radius[r].retry = backoff(radius[r].try++);
2523 if (radius[r].try > 5)
2524 {
2525 sessionshutdown(s, "CHAP timeout.", CDN_ADMIN_DISC, TERM_REAUTHENTICATION_FAILURE);
2526 STAT(tunnel_tx_errors);
2527 return ;
2528 }
2529 q = makeppp(b, sizeof(b), 0, 0, s, t, PPPCHAP, 0, 0, 0);
2530 if (!q) return;
2531
2532 *q = 1; // challenge
2533 q[1] = radius[r].id; // ID
2534 q[4] = 16; // value size (size of challenge)
2535 memcpy(q + 5, radius[r].auth, 16); // challenge
2536 strcpy((char *) q + 21, config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname); // our name
2537 *(uint16_t *) (q + 2) = htons(strlen(config->multi_n_hostname[tunnel[t].indexudp][0]?config->multi_n_hostname[tunnel[t].indexudp]:hostname) + 21); // length
2538 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
2539 }
2540
2541 // fill in a L2TP message with a PPP frame,
2542 // returns start of PPP frame
2543 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)
2544 {
2545 uint16_t hdr = 0x0002; // L2TP with no options
2546 uint16_t type = mtype;
2547 uint8_t *start = b;
2548
2549 if (t == TUNNEL_ID_PPPOE)
2550 {
2551 return pppoe_makeppp(b, size, p, l, s, t, mtype, prio, bid, mp_bits);
2552 }
2553
2554 if (size < 16) // Need more space than this!!
2555 {
2556 LOG(0, s, t, "makeppp buffer too small for L2TP header (size=%d)\n", size);
2557 return NULL;
2558 }
2559
2560 if (prio) hdr |= 0x0100; // set priority bit
2561
2562 *(uint16_t *) (b + 0) = htons(hdr);
2563 *(uint16_t *) (b + 2) = htons(tunnel[t].far); // tunnel
2564 *(uint16_t *) (b + 4) = htons(session[s].far); // session
2565 b += 6;
2566
2567 // Check whether this session is part of multilink
2568 if (bid)
2569 {
2570 if (bundle[bid].num_of_links > 1)
2571 type = PPPMP; // Change PPP message type to the PPPMP
2572 else
2573 bid = 0;
2574 }
2575
2576 if (type == PPPLCP || !(session[s].flags & SESSION_ACFC))
2577 {
2578 *(uint16_t *) b = htons(0xFF03); // HDLC header
2579 b += 2;
2580 }
2581
2582 if (type < 0x100 && session[s].flags & SESSION_PFC)
2583 {
2584 *b++ = type;
2585 }
2586 else
2587 {
2588 *(uint16_t *) b = htons(type);
2589 b += 2;
2590 }
2591
2592 if (bid)
2593 {
2594 // Set the sequence number and (B)egin (E)nd flags
2595 if (session[s].mssf)
2596 {
2597 // Set the multilink bits
2598 uint16_t bits_send = mp_bits;
2599 *(uint16_t *) b = htons((bundle[bid].seq_num_t & 0x0FFF)|bits_send);
2600 b += 2;
2601 }
2602 else
2603 {
2604 *(uint32_t *) b = htonl(bundle[bid].seq_num_t);
2605 // Set the multilink bits
2606 *b = mp_bits;
2607 b += 4;
2608 }
2609
2610 bundle[bid].seq_num_t++;
2611
2612 // Add the message type if this fragment has the begin bit set
2613 if (mp_bits & MP_BEGIN)
2614 {
2615 //*b++ = mtype; // The next two lines are instead of this
2616 *(uint16_t *) b = htons(mtype); // Message type
2617 b += 2;
2618 }
2619 }
2620
2621 if ((b - start) + l > size)
2622 {
2623 LOG(2, s, t, "makeppp would overflow buffer (size=%d, header+payload=%td)\n", size, (b - start) + l);
2624 return NULL;
2625 }
2626
2627 // Copy the payload
2628 if (p && l)
2629 memcpy(b, p, l);
2630
2631 return b;
2632 }
2633
2634 // fill in a L2TP message with a PPP frame,
2635 // returns start of PPP frame
2636 //(note: THIS ROUTINE CAN WRITES TO p[-28]).
2637 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)
2638 {
2639 uint16_t hdr = 0x0002; // L2TP with no options
2640 uint16_t type = mtype;
2641 uint8_t *b = p;
2642
2643 if (t == TUNNEL_ID_PPPOE)
2644 {
2645 return opt_pppoe_makeppp(p, l, s, t, mtype, prio, bid, mp_bits);
2646 }
2647
2648 // Check whether this session is part of multilink
2649 if (bid)
2650 {
2651 if (bundle[bid].num_of_links > 1)
2652 type = PPPMP; // Change PPP message type to the PPPMP
2653 else
2654 bid = 0;
2655 }
2656
2657 if (bid)
2658 {
2659 // Add the message type if this fragment has the begin bit set
2660 if (mp_bits & MP_BEGIN)
2661 {
2662 b -= 2;
2663 *(uint16_t *) b = htons(mtype); // Message type
2664 }
2665
2666 // Set the sequence number and (B)egin (E)nd flags
2667 if (session[s].mssf)
2668 {
2669 // Set the multilink bits
2670 uint16_t bits_send = mp_bits;
2671 b -= 2;
2672 *(uint16_t *) b = htons((bundle[bid].seq_num_t & 0x0FFF)|bits_send);
2673 }
2674 else
2675 {
2676 b -= 4;
2677 *(uint32_t *) b = htonl(bundle[bid].seq_num_t);
2678 // Set the multilink bits
2679 *b = mp_bits;
2680 }
2681
2682 bundle[bid].seq_num_t++;
2683 }
2684
2685 if (type < 0x100 && session[s].flags & SESSION_PFC)
2686 {
2687 b--;
2688 *b = type;
2689 }
2690 else
2691 {
2692 b -= 2;
2693 *(uint16_t *) b = htons(type);
2694 }
2695
2696 if (type == PPPLCP || !(session[s].flags & SESSION_ACFC))
2697 {
2698 b -= 2;
2699 *(uint16_t *) b = htons(0xFF03); // HDLC header
2700 }
2701
2702 if (prio) hdr |= 0x0100; // set priority bit
2703 b -= 2;
2704 *(uint16_t *) b = htons(session[s].far); // session
2705 b -= 2;
2706 *(uint16_t *) b = htons(tunnel[t].far); // tunnel
2707 b -= 2;
2708 *(uint16_t *) b = htons(hdr);
2709
2710 return b;
2711 }
2712
2713 static int add_lcp_auth(uint8_t *b, int size, int authtype)
2714 {
2715 int len = 0;
2716 if ((authtype == AUTHCHAP && size < 5) || size < 4)
2717 return 0;
2718
2719 *b++ = 3; // Authentication-Protocol
2720 if (authtype == AUTHCHAP)
2721 {
2722 len = *b++ = 5; // length
2723 *(uint16_t *) b = htons(PPPCHAP); b += 2;
2724 *b++ = 5; // MD5
2725 }
2726 else if (authtype == AUTHPAP)
2727 {
2728 len = *b++ = 4; // length
2729 *(uint16_t *) b = htons(PPPPAP); b += 2;
2730 }
2731 else
2732 {
2733 LOG(0, 0, 0, "add_lcp_auth called with unsupported auth type %d\n", authtype);
2734 }
2735
2736 return len;
2737 }
2738
2739 // Send LCP ConfigReq for MRU, authentication type and magic no
2740 void sendlcp(sessionidt s, tunnelidt t)
2741 {
2742 uint8_t b[500], *q, *l;
2743 int authtype = sess_local[s].lcp_authtype;
2744
2745 if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPLCP, 0, 0, 0)))
2746 return;
2747
2748 LOG(3, s, t, "LCP: send ConfigReq%s%s%s including MP options\n",
2749 authtype ? " (" : "",
2750 authtype ? (authtype == AUTHCHAP ? "CHAP" : "PAP") : "",
2751 authtype ? ")" : "");
2752
2753 l = q;
2754 *l++ = ConfigReq;
2755 *l++ = ++sess_local[s].lcp_ident; // ID
2756
2757 l += 2; //Save space for length
2758
2759 if (sess_local[s].ppp_mru)
2760 {
2761 *l++ = 1; *l++ = 4; // Maximum-Receive-Unit (length 4)
2762 *(uint16_t *) l = htons(sess_local[s].ppp_mru); l += 2;
2763 }
2764
2765 if (authtype)
2766 l += add_lcp_auth(l, sizeof(b) - (l - b), authtype);
2767
2768 if (session[s].magic)
2769 {
2770 *l++ = 5; *l++ = 6; // Magic-Number (length 6)
2771 *(uint32_t *) l = htonl(session[s].magic);
2772 l += 4;
2773 }
2774
2775 if (sess_local[s].mp_mrru)
2776 {
2777 *l++ = 17; *l++ = 4; // Multilink Max-Receive-Reconstructed-Unit (length 4)
2778 *(uint16_t *) l = htons(sess_local[s].mp_mrru); l += 2;
2779 }
2780
2781 if (sess_local[s].mp_epdis)
2782 {
2783 *l++ = 19; *l++ = 7; // Multilink Endpoint Discriminator (length 7)
2784 *l++ = IPADDR; // Endpoint Discriminator class
2785 *(uint32_t *) l = htonl(sess_local[s].mp_epdis);
2786 l += 4;
2787 }
2788
2789 *(uint16_t *)(q + 2) = htons(l - q); // Length
2790
2791 LOG_HEX(5, "PPPLCP", q, l - q);
2792 if (config->debug > 3) dumplcp(q, l - q);
2793
2794 tunnelsend(b, (l - b), t);
2795 restart_timer(s, lcp);
2796 }
2797
2798 // Send CCP request for no compression
2799 void sendccp(sessionidt s, tunnelidt t)
2800 {
2801 uint8_t b[500], *q;
2802
2803 if (!(q = makeppp(b, sizeof(b), NULL, 0, s, t, PPPCCP, 0, 0, 0)))
2804 return;
2805
2806 LOG(3, s, t, "CCP: send ConfigReq (no compression)\n");
2807
2808 *q = ConfigReq;
2809 *(q + 1) = ++sess_local[s].lcp_ident; // ID
2810 *(uint16_t *)(q + 2) = htons(4); // Length
2811
2812 LOG_HEX(5, "PPPCCP", q, 4);
2813 tunnelsend(b, (q - b) + 4 , t);
2814 restart_timer(s, ccp);
2815 }
2816
2817 // Reject unknown/unconfigured protocols
2818 void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto)
2819 {
2820
2821 uint8_t buf[MAXETHER];
2822 uint8_t *q;
2823 int mru = session[s].mru;
2824 if (mru < MINMTU) mru = MINMTU;
2825 if (mru > sizeof(buf)) mru = sizeof(buf);
2826
2827 l += 6;
2828 if (l > mru) l = mru;
2829
2830 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPLCP, 0, 0, 0);
2831 if (!q) return;
2832
2833 *q = ProtocolRej;
2834 *(q + 1) = ++sess_local[s].lcp_ident;
2835 *(uint16_t *)(q + 2) = htons(l);
2836 *(uint16_t *)(q + 4) = htons(proto);
2837 memcpy(q + 6, p, l - 6);
2838
2839 if (proto == PPPIPV6CP)
2840 LOG(3, s, t, "LCP: send ProtocolRej (IPV6CP: not configured)\n");
2841 else
2842 LOG(2, s, t, "LCP: sent ProtocolRej (0x%04X: unsupported)\n", proto);
2843
2844 tunnelsend(buf, l + (q - buf), t);
2845 }
for cloning use: "git clone git://git.sameswireless.fr/l2tpns.git" ; For add to your sources.list: "deb http://package.sameswifi.fr/ jessie main"