989ddd987139ee6a2e756cee473d526a9c269265
[l2tpns.git] / l2tpns.h
1 // L2TPNS Global Stuff
2 // $Id: l2tpns.h,v 1.121 2009-12-08 14:49:28 bodea Exp $
3
4 #ifndef __L2TPNS_H__
5 #define __L2TPNS_H__
6
7 #include <netinet/in.h>
8 #include <stdio.h>
9 #include <signal.h>
10 #include <stdlib.h>
11 #include <netinet/in.h>
12 #include <net/ethernet.h>
13 #include <sys/socket.h>
14 #include <arpa/inet.h>
15 #include <sys/types.h>
16 #include <libcli.h>
17
18 #define VERSION "2.2.1"
19
20 // Limits
21 #define MAXTUNNEL 500 // could be up to 65535
22 #define MAXBUNDLE 300 // could be up to 65535
23 #define MAXBUNDLESES 12 // Maximum number of member links in bundle
24 #define MAXADDRESS 20 // Maximum length for the Endpoint Discrminiator address
25 #define MAXSESSION 60000 // could be up to 65535
26 #define MAXTBFS 6000 // Maximum token bucket filters. Might need up to 2 * session.
27 #define MAXSESSINGRP 12 // Maximum number of member links in grouped session
28 #define MAXGRPINSESS 12 // Maximum number of member links in session group
29 #define MAXGROUPE 300 // could be up to 65535, Maximum number of grouped session
30 #define MAXROUTEINGRP 15 // max static routes per group
31
32 // Tunnel Id reserved for pppoe
33 #define TUNNEL_ID_PPPOE 1
34
35 #define RADIUS_SHIFT 6
36 #define RADIUS_FDS (1 << RADIUS_SHIFT)
37 #define RADIUS_MASK ((1 << RADIUS_SHIFT) - 1)
38 #define MAXRADIUS (1 << (8 + RADIUS_SHIFT))
39
40 #define T_UNDEF (0xffff) // A tunnel ID that won't ever be used. Mark session as undefined.
41 #define T_FREE (0) // A tunnel ID that won't ever be used. Mark session as free.
42
43 #define MAXCONTROL 1000 // max length control message we ever send...
44 #define MINMTU 576 // minimum recommended MTU (rfc1063)
45 #define MAXMTU 2600 // arbitrary maximum MTU
46 #define PPPoE_MRU 1492 // maximum PPPoE MRU (rfc2516: 1500 less PPPoE header (6) and PPP protocol ID (2))
47 #define MAXETHER (MAXMTU+18) // max packet we try sending to tun
48 #define MAXTEL 96 // telephone number
49 #define MAXHOSTNAME 256 // hostname
50 #define MAXUSER 128 // username
51 #define MAXPASS 128 // password
52 #define MAXCLASS 128 // radius class attribute size
53 #define MAXPLUGINS 20 // maximum number of plugins to load
54 #define MAXRADSERVER 10 // max radius servers
55 #define MAXROUTE 10 // max static routes per session
56 #define MAXIPPOOL 131072 // max number of ip addresses in pool
57 #define RINGBUFFER_SIZE 10000 // Number of ringbuffer entries to allocate
58 #define MAX_LOG_LENGTH 512 // Maximum size of log message
59 #define ECHO_TIMEOUT 10 // Time between last packet sent and LCP ECHO generation
60 #define IDLE_ECHO_TIMEOUT 240 // Time between last packet seen and session shutdown
61 #define BUSY_WAIT_TIME 3000 // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
62
63 #define MP_BEGIN 0x80 // This value is used when (b)egin bit is set in MP header
64 #define MP_END 0x40 // This value is used when (e)nd bit is set in MP header
65 #define MP_BOTH_BITS 0xC0 // This value is used when both bits (begin and end) are set in MP header
66
67 #define MINFRAGLEN 64 // Minumum fragment length
68 #define MAXFRAGLEN 1496 // Maximum length for Multilink fragment (The multilink may contain only one link)
69 #define MAXFRAGNUM 512 // Maximum number of Multilink fragment in a bundle (must be in the form of 2^X)
70 // it's not expected to have a space for more than 10 unassembled packets = 10 * MAXBUNDLESES
71 #define MAXFRAGNUM_MASK (MAXFRAGNUM - 1) // Must be equal to MAXFRAGNUM-1
72
73 // Constants
74 #ifndef ETCDIR
75 #define ETCDIR "/etc/l2tpns"
76 #endif
77
78 #ifndef LIBDIR
79 #define LIBDIR "/usr/lib/l2tpns"
80 #endif
81
82 #ifndef PLUGINDIR
83 #define PLUGINDIR LIBDIR // Plugins
84 #endif
85
86 #ifndef PLUGINCONF
87 #define PLUGINCONF ETCDIR // Plugin config dir
88 #endif
89
90 #ifndef FLASHDIR
91 #define FLASHDIR ETCDIR
92 #endif
93
94 #define TUNDEVICE "/dev/net/tun"
95 #define RANDOMDEVICE "/dev/urandom" // default, not as secure as /dev/random but non-blocking
96 #define CONFIGFILE FLASHDIR "/startup-config" // Configuration file
97 #define CLIUSERS FLASHDIR "/users" // CLI Users file
98 #define IPPOOLFILE FLASHDIR "/ip_pool" // Address pool configuration
99 #define ACCT_TIME 3000 // 5 minute accounting interval
100 #define ACCT_SHUT_TIME 600 // 1 minute for counters of shutdown sessions
101 #define L2TPPORT 1701 // L2TP port
102 #define RADPORT 1645 // old radius port...
103 #define DAEPORT 3799 // DAE port
104 #define PKTARP 0x0806 // ARP packet type
105 #define PKTIP 0x0800 // IPv4 packet type
106 #define PKTIPV6 0x86DD // IPv6 packet type
107 #define PPPPAP 0xC023
108 #define PPPCHAP 0xC223
109 #define PPPLCP 0xC021
110 #define PPPIPCP 0x8021
111 #define PPPIPV6CP 0x8057
112 #define PPPCCP 0x80FD
113 #define PPPIP 0x0021
114 #define PPPIPV6 0x0057
115 #define PPPMP 0x003D
116 #define MIN_IP_SIZE 0x19
117
118 enum {
119 ConfigReq = 1,
120 ConfigAck,
121 ConfigNak,
122 ConfigRej,
123 TerminateReq,
124 TerminateAck,
125 CodeRej,
126 ProtocolRej,
127 EchoReq,
128 EchoReply,
129 DiscardRequest,
130 IdentRequest
131 };
132
133 enum {
134 AccessRequest = 1,
135 AccessAccept,
136 AccessReject,
137 AccountingRequest,
138 AccountingResponse,
139 AccessChallenge = 11,
140 DisconnectRequest = 40,
141 DisconnectACK,
142 DisconnectNAK,
143 CoARequest,
144 CoAACK,
145 CoANAK
146 };
147
148 // PPP phases
149 enum {
150 Dead,
151 Establish,
152 Authenticate,
153 Network,
154 Terminate
155 };
156
157 // PPP states
158 enum {
159 Initial,
160 Starting,
161 Closed,
162 Stopped,
163 Closing,
164 Stopping,
165 RequestSent,
166 AckReceived,
167 AckSent,
168 Opened
169 };
170
171 // reset state machine counters
172 #define initialise_restart_count(_s, _fsm) \
173 sess_local[_s]._fsm.conf_sent = \
174 sess_local[_s]._fsm.nak_sent = 0
175
176 // no more attempts
177 #define zero_restart_count(_s, _fsm) ({ \
178 sess_local[_s]._fsm.conf_sent = \
179 config->ppp_max_configure; \
180 sess_local[_s]._fsm.restart = \
181 time_now + config->ppp_restart_time; \
182 })
183
184 // increment ConfReq counter and reset timer
185 #define restart_timer(_s, _fsm) ({ \
186 sess_local[_s]._fsm.conf_sent++; \
187 sess_local[_s]._fsm.restart = \
188 time_now + config->ppp_restart_time; \
189 })
190
191 // stop timer on change to state where timer does not run
192 #define change_state(_s, _fsm, _new) ({ \
193 if (_new != session[_s].ppp._fsm) \
194 { \
195 switch (_new) \
196 { \
197 case Initial: \
198 case Starting: \
199 case Closed: \
200 case Stopped: \
201 case Opened: \
202 sess_local[_s]._fsm.restart = 0; \
203 initialise_restart_count(_s, _fsm); \
204 } \
205 session[_s].ppp._fsm = _new; \
206 cluster_send_session(_s); \
207 } \
208 })
209
210 // Types
211 typedef uint16_t sessionidt;
212 typedef uint16_t bundleidt;
213 typedef uint16_t tunnelidt;
214 typedef uint16_t groupidt;
215 typedef uint32_t clockt;
216 typedef uint8_t hasht[16];
217
218 // CLI actions
219 struct cli_session_actions {
220 char action;
221 in_addr_t snoop_ip;
222 uint16_t snoop_port;
223 int throttle_in;
224 int throttle_out;
225 int filter_in;
226 int filter_out;
227 };
228
229 #define CLI_SESS_KILL 0x01
230 #define CLI_SESS_SNOOP 0x02
231 #define CLI_SESS_NOSNOOP 0x04
232 #define CLI_SESS_THROTTLE 0x08
233 #define CLI_SESS_NOTHROTTLE 0x10
234 #define CLI_SESS_FILTER 0x20
235 #define CLI_SESS_NOFILTER 0x40
236
237 struct cli_tunnel_actions {
238 char action;
239 };
240
241 #define CLI_TUN_KILL 0x01
242
243 // structures
244 typedef struct // route
245 {
246 in_addr_t ip;
247 int prefixlen;
248 }
249 routet;
250
251 typedef struct controls // control message
252 {
253 struct controls *next; // next in queue
254 uint16_t length; // length
255 union {
256 uint8_t buf[MAXCONTROL];
257 uint16_t buf16[MAXCONTROL/2];
258 } __attribute__ ((__transparent_union__));
259 }
260 controlt;
261
262 typedef struct {
263 uint8_t length; // Endpoint Discriminator length
264 uint8_t addr_class; // Endpoint Discriminator class
265 uint8_t address[MAXADDRESS]; // Endpoint Discriminator address
266 } epdist;
267
268 typedef struct {
269 sessionidt sid; // Fragment originating session
270 tunnelidt tid; // Fragment originating tunnel
271 uint8_t flags; // MP frame flags
272 uint32_t seq; // fragment seq num
273 uint32_t jitteravg;
274 uint16_t length; // Fragment length
275 uint8_t data[MAXFRAGLEN]; // Fragment data
276 } fragmentt;
277
278 typedef struct
279 {
280 sessionidt next; // next session in linked list
281 sessionidt far; // far end session ID
282 tunnelidt tunnel; // near end tunnel ID
283 uint8_t flags; // session flags: see SESSION_*
284 struct {
285 uint8_t phase; // PPP phase
286 uint8_t lcp:4; // LCP state
287 uint8_t ipcp:4; // IPCP state
288 uint8_t ipv6cp:4; // IPV6CP state
289 uint8_t ccp:4; // CCP state
290 } ppp;
291 uint16_t mru; // maximum receive unit
292 in_addr_t ip; // IP of session set by RADIUS response (host byte order).
293 int ip_pool_index; // index to IP pool
294 uint32_t unique_id; // unique session id
295 uint32_t magic; // ppp magic number
296 uint32_t pin, pout; // packet counts
297 uint32_t cin, cout; // byte counts
298 uint32_t cin_wrap, cout_wrap; // byte counter wrap count (RADIUS accounting giagawords)
299 uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
300 uint16_t throttle_in; // upstream throttle rate (kbps)
301 uint16_t throttle_out; // downstream throttle rate
302 uint8_t filter_in; // input filter index (to ip_filters[N-1]; 0 if none)
303 uint8_t filter_out; // output filter index
304 uint16_t snoop_port; // Interception destination port
305 in_addr_t snoop_ip; // Interception destination IP
306 clockt opened; // when started
307 clockt die; // being closed, when to finally free
308 uint32_t session_timeout; // Maximum session time in seconds
309 uint32_t idle_timeout; // Maximum idle time in seconds
310 time_t last_packet; // Last packet from the user (used for idle timeouts)
311 time_t last_data; // Last data packet to/from the user (used for idle timeouts)
312 in_addr_t dns1, dns2; // DNS servers
313 routet route[MAXROUTE]; // static routes
314 uint16_t tbf_in; // filter bucket for throttling in from the user.
315 uint16_t tbf_out; // filter bucket for throttling out to the user.
316 int random_vector_length;
317 uint8_t random_vector[MAXTEL];
318 char user[MAXUSER]; // user (needed in session for radius stop messages)
319 char called[MAXTEL]; // called number
320 char calling[MAXTEL]; // calling number
321 uint32_t tx_connect_speed;
322 uint32_t rx_connect_speed;
323 clockt timeout; // Session timeout
324 uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit
325 epdist epdis; // Multilink Endpoint Discriminator
326 bundleidt bundle; // Multilink Bundle Identifier
327 uint8_t mssf; // Multilink Short Sequence Number Header Format
328 uint8_t walled_garden; // is this session gardened?
329 uint8_t classlen; // class (needed for radius accounting messages)
330 char class[MAXCLASS];
331 uint8_t ipv6prefixlen; // IPv6 route prefix length
332 struct in6_addr ipv6route; // Static IPv6 route
333 #ifdef LAC
334 sessionidt forwardtosession; // LNS id_session to forward
335 uint8_t src_hwaddr[ETH_ALEN]; // MAC addr source (for pppoe sessions 6 bytes)
336 uint32_t coutgrp_delta;
337 #else
338 uint8_t src_hwaddr[ETH_ALEN]; // MAC addr source (for pppoe sessions 6 bytes)
339 uint32_t coutgrp_delta;
340 char reserved[2]; // Space to expand structure without changing HB_VERSION
341 #endif
342 }
343 sessiont;
344
345 typedef struct
346 {
347 uint32_t tx_rate;
348 time_t mark_time;
349 sessionidt sid;
350 uint8_t weight;
351 }
352 groupsessionidt;
353
354 typedef struct
355 {
356 //uint16_t indexprevsessid;
357 uint32_t time_changed;
358 //time_t mark_time;
359 groupidt prev;
360 groupsessionidt sesslist[MAXSESSINGRP];
361 routet route[MAXROUTEINGRP]; // static routes
362 uint8_t nbroutesgrp;
363 uint8_t nbsession;
364 }
365 groupsesst;
366
367 typedef struct
368 {
369 int state; // current state (bundlestate enum)
370 uint32_t seq_num_t; // Sequence Number (transmission)
371 uint32_t timeout; // Session-Timeout for bundle
372 uint32_t max_seq; // Max value of sequence number field
373 uint8_t num_of_links; // Number of links joint to this bundle
374 uint32_t online_time; // The time this bundle is online
375 clockt last_check; // Last time the timeout is checked
376 uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit
377 uint8_t mssf; // Multilink Short Sequence Number Header Format
378 epdist epdis; // Multilink Endpoint Discriminator
379 char user[MAXUSER]; // Needed for matching member links
380 sessionidt current_ses; // Current session to use for sending (used in RR load-balancing)
381 sessionidt members[MAXBUNDLESES]; // Array for member links sessions
382 }
383 bundlet;
384
385 typedef struct
386 {
387 fragmentt fragment[MAXFRAGNUM];
388 uint8_t reassembled_frame[MAXETHER]; // The reassembled frame
389 uint16_t re_frame_len; // The reassembled frame length
390 uint16_t re_frame_begin_index, re_frame_end_index; // reassembled frame begin index, end index respectively
391 uint16_t start_index, end_index; // start and end sequence numbers available on the fragments array respectively
392 uint32_t M; // Minumum frame sequence number received over all bundle members
393 uint32_t start_seq; // Last received frame sequence number (bearing B bit)
394 }
395 fragmentationt;
396
397 #define AUTHPAP 1 // allow PAP
398 #define AUTHCHAP 2 // allow CHAP
399
400 typedef struct
401 {
402 // packet counters
403 uint32_t pin;
404 uint32_t pout;
405
406 // byte counters
407 uint32_t cin;
408 uint32_t cout;
409
410 // PPP restart timer/counters
411 struct {
412 time_t restart;
413 int conf_sent;
414 int nak_sent;
415 } lcp, ipcp, ipv6cp, ccp;
416
417 // identifier for Protocol-Reject, Code-Reject
418 uint8_t lcp_ident;
419
420 // authentication to use
421 int lcp_authtype;
422
423 // our MRU
424 uint16_t ppp_mru;
425
426 // our MRRU
427 uint16_t mp_mrru;
428
429 // our mssf
430 uint16_t mp_mssf;
431
432 // our Endpoint Discriminator
433 in_addr_t mp_epdis;
434
435 // DoS prevention
436 clockt last_packet_out;
437 uint32_t packets_out;
438 uint32_t packets_dropped;
439
440 // RADIUS session in use
441 uint16_t radius;
442
443 // interim RADIUS
444 time_t last_interim;
445
446 // last LCP Echo
447 time_t last_echo;
448
449 // Last Multilink frame sequence number received
450 uint32_t last_seq;
451
452 // jitter average of the session
453 uint32_t jitteravg;
454 // time in milliseconds of the last fragment.
455 uint64_t prev_time;
456 } sessionlocalt;
457
458 // session flags
459 #define SESSION_PFC (1 << 0) // use Protocol-Field-Compression
460 #define SESSION_ACFC (1 << 1) // use Address-and-Control-Field-Compression
461 #define SESSION_STARTED (1 << 2) // RADIUS Start record sent
462
463 // 328 bytes per tunnel
464 typedef struct
465 {
466 tunnelidt far; // far end tunnel ID
467 in_addr_t ip; // Ip for far end
468 uint16_t port; // port for far end
469 uint16_t window; // Rx window
470 uint16_t nr; // next receive
471 uint16_t ns; // next send
472 int state; // current state (tunnelstate enum)
473 clockt last; // when last control message sent (used for resend timeout)
474 clockt retry; // when to try resending pending control
475 clockt die; // being closed, when to finally free
476 clockt lastrec; // when the last control message was received
477 char hostname[128]; // tunnel hostname
478 char vendor[128]; // LAC vendor
479 uint8_t try; // number of retrys on a control message
480 uint16_t controlc; // outstaind messages in queue
481 controlt *controls; // oldest message
482 controlt *controle; // newest message
483 #ifdef LAC
484 uint16_t isremotelns; // != 0 if the tunnel is to remote LNS (== index on the conf remote lns)
485 char reserved[14]; // Space to expand structure without changing HB_VERSION
486 #else
487 char reserved[16]; // Space to expand structure without changing HB_VERSION
488 #endif
489 }
490 tunnelt;
491
492 // 164 bytes per radius session
493 typedef struct // outstanding RADIUS requests
494 {
495 sessionidt session; // which session this applies to
496 hasht auth; // request authenticator
497 clockt retry; // when to try next
498 char pass[129]; // password
499 uint8_t id; // ID for PPP response
500 uint8_t try; // which try we are on
501 uint8_t state; // state of radius requests
502 uint8_t chap; // set if CHAP used (is CHAP identifier)
503 uint8_t term_cause; // Stop record: Acct-Terminate-Cause
504 char const *term_msg; // terminate reason
505 }
506 radiust;
507
508 typedef struct
509 {
510 in_addr_t address; // Host byte order..
511 char assigned; // 1 if assigned, 0 if free
512 sessionidt session;
513 clockt last; // last used
514 char user[129]; // user (try to have ip addresses persistent)
515 }
516 ippoolt;
517
518 #ifdef RINGBUFFER
519 struct Tringbuffer
520 {
521 struct {
522 char level;
523 sessionidt session;
524 tunnelidt tunnel;
525 char message[MAX_LOG_LENGTH];
526 } buffer[RINGBUFFER_SIZE];
527 int head;
528 int tail;
529 };
530 #endif
531
532 /*
533 * Possible tunnel states
534 * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
535 */
536 enum
537 {
538 TUNNELFREE, // Not in use
539 TUNNELOPEN, // Active tunnel
540 TUNNELDIE, // Currently closing
541 TUNNELOPENING, // Busy opening
542 TUNNELUNDEF, // Undefined
543 };
544
545 enum
546 {
547 BUNDLEFREE, // Not in use
548 BUNDLEOPEN, // Active bundle
549 BUNDLEUNDEF, // Undefined
550 };
551
552 enum
553 {
554 NULLCLASS = 0, //End Point Discriminator classes
555 LOCALADDR,
556 IPADDR,
557 IEEEMACADDR,
558 PPPMAGIC,
559 PSNDN,
560 };
561
562 enum
563 {
564 RADIUSNULL, // Not in use
565 RADIUSCHAP, // sending CHAP down PPP
566 RADIUSAUTH, // sending auth to RADIUS server
567 RADIUSSTART, // sending start accounting to RADIUS server
568 RADIUSSTOP, // sending stop accounting to RADIUS server
569 RADIUSINTERIM, // sending interim accounting to RADIUS server
570 RADIUSWAIT, // waiting timeout before available, in case delayed replies
571 RADIUSJUSTAUTH, // sending auth to RADIUS server, just authentication, no ip assigning
572 };
573
574 struct Tstats
575 {
576 time_t start_time;
577 time_t last_reset;
578
579 uint32_t tun_rx_packets;
580 uint32_t tun_tx_packets;
581 uint32_t tun_rx_bytes;
582 uint32_t tun_tx_bytes;
583 uint32_t tun_rx_errors;
584 uint32_t tun_tx_errors;
585 uint32_t tun_rx_dropped;
586
587 uint32_t tunnel_rx_packets;
588 uint32_t tunnel_tx_packets;
589 uint32_t tunnel_rx_bytes;
590 uint32_t tunnel_tx_bytes;
591 uint32_t tunnel_rx_errors;
592 uint32_t tunnel_tx_errors;
593
594 uint32_t tunnel_retries;
595 uint32_t radius_retries;
596
597 uint32_t arp_sent;
598
599 uint32_t packets_snooped;
600
601 uint32_t tunnel_created;
602 uint32_t session_created;
603 uint32_t tunnel_timeout;
604 uint32_t session_timeout;
605 uint32_t radius_timeout;
606 uint32_t radius_overflow;
607 uint32_t tunnel_overflow;
608 uint32_t session_overflow;
609
610 uint32_t ip_allocated;
611 uint32_t ip_freed;
612
613 uint32_t c_forwarded;
614 uint32_t recv_forward;
615
616 uint32_t select_called;
617 uint32_t multi_read_used;
618 uint32_t multi_read_exceeded;
619
620 #ifdef STATISTICS
621 uint32_t call_processtun;
622 uint32_t call_processipout;
623 uint32_t call_processipv6out;
624 uint32_t call_processudp;
625 uint32_t call_sessionbyip;
626 uint32_t call_sessionbyipv6;
627 uint32_t call_sessionbyuser;
628 uint32_t call_sendarp;
629 uint32_t call_sendipcp;
630 uint32_t call_sendipv6cp;
631 uint32_t call_processipv6cp;
632 uint32_t call_tunnelsend;
633 uint32_t call_sessionkill;
634 uint32_t call_sessionshutdown;
635 uint32_t call_tunnelkill;
636 uint32_t call_tunnelshutdown;
637 uint32_t call_assign_ip_address;
638 uint32_t call_free_ip_address;
639 uint32_t call_dump_acct_info;
640 uint32_t call_sessionsetup;
641 uint32_t call_processpap;
642 uint32_t call_processchap;
643 uint32_t call_processlcp;
644 uint32_t call_processipcp;
645 uint32_t call_processipin;
646 uint32_t call_processipv6in;
647 uint32_t call_processccp;
648 uint32_t call_sendchap;
649 uint32_t call_processrad;
650 uint32_t call_radiussend;
651 uint32_t call_radiusretry;
652 uint32_t call_random_data;
653 #endif
654 };
655
656 #ifdef STATISTICS
657
658 #ifdef STAT_CALLS
659 #define CSTAT(x) STAT(call_ ## x)
660 #else
661 #define CSTAT(x)
662 #endif
663
664 #define STAT(x) (_statistics->x++)
665 #define INC_STAT(x,y) (_statistics->x += (y))
666 #define GET_STAT(x) (_statistics->x)
667 #define SET_STAT(x, y) (_statistics->x = (y))
668 #else
669 #define CSTAT(x)
670 #define STAT(x)
671 #define INC_STAT(x,y)
672 #define GET_STAT(x) 0
673 #define SET_STAT(x, y)
674 #endif
675
676 #ifndef IFNAMSIZ
677 # define IFNAMSIZ 16
678 #endif
679
680 typedef struct
681 {
682 int debug; // debugging level
683 time_t start_time; // time when l2tpns was started
684 char bandwidth[256]; // current bandwidth
685 char pid_file[256]; // file to write PID to on startup
686 int wrote_pid;
687 clockt current_time; // 1/10ths of a second since the process started.
688 // means that we can only run a given process
689 // for 13 years without re-starting!
690
691 char config_file[128];
692 int reload_config; // flag to re-read config (set by cli)
693 int multi_read_count; // amount of packets to read per fd in processing loop
694
695 char tundevicename[IFNAMSIZ]; // tun device name
696 char log_filename[128];
697
698 char l2tp_secret[64]; // L2TP shared secret
699 int l2tp_mtu; // MTU of interface used for L2TP
700
701 char random_device[256]; // random device path, defaults to RANDOMDEVICE
702
703 int ppp_restart_time; // timeout for PPP restart
704 int ppp_max_configure; // max lcp configure requests to send
705 int ppp_max_failure; // max lcp configure naks to send
706
707 char radiussecret[64];
708 int radius_accounting;
709 int radius_interim;
710 in_addr_t radiusserver[MAXRADSERVER]; // radius servers
711 uint16_t radiusport[MAXRADSERVER]; // radius base ports
712 uint8_t numradiusservers; // radius server count
713
714 uint16_t radius_dae_port; // port for radius DAE
715 uint16_t radius_bind_min; // port range for udp sockets used to send/recv radius packets
716 uint16_t radius_bind_max;
717
718 char radius_authtypes_s[32]; // list of valid authentication types (chap, pap) in order of preference
719 int radius_authtypes;
720 int radius_authprefer;
721
722 int allow_duplicate_users; // allow multiple logins with the same username
723 int kill_timedout_sessions; // kill authenticated sessions with "session_timeout == 0"
724
725 in_addr_t default_dns1, default_dns2;
726
727 unsigned long rl_rate; // default throttle rate
728 int num_tbfs; // number of throttle buckets
729
730 char accounting_dir[128];
731 in_addr_t bind_address;
732 in_addr_t peer_address;
733 int send_garp; // Set to true to garp for vip address on startup
734
735 int dump_speed;
736 char plugins[64][MAXPLUGINS];
737 char old_plugins[64][MAXPLUGINS];
738
739 int next_tbf; // Next HTB id available to use
740 int scheduler_fifo; // If the system has multiple CPUs, use FIFO scheduling
741 // policy for this process.
742 int lock_pages; // Lock pages into memory.
743 int icmp_rate; // Max number of ICMP unreachable per second to send
744 int max_packets; // DoS prevention: per session limit of packets/0.1s
745 char epdis_addr[20]; // MP Endpoint Discriminator address
746
747 in_addr_t cluster_address; // Multicast address of cluster.
748 // Send to this address to have everyone hear.
749 char cluster_interface[64]; // Which interface to listen for multicast on.
750 int cluster_iam_master; // Are we the cluster master???
751 int cluster_iam_uptodate; // Set if we've got a full set of state from the master.
752 in_addr_t cluster_master_address; // The network address of the cluster master.
753 // Zero if i am the cluster master.
754 int cluster_seq_number; // Sequence number of the next heartbeat we'll send out
755 // (or the seq number we're next expecting if we're a slave).
756 int cluster_undefined_sessions; // How many sessions we're yet to receive from the master.
757 int cluster_undefined_bundles; // How many bundles we're yet to receive from the master.
758 int cluster_undefined_tunnels; // How many tunnels we're yet to receive from the master.
759 int cluster_highest_sessionid;
760 int cluster_highest_bundleid;
761 int cluster_highest_tunnelid;
762 clockt cluster_last_hb; // Last time we saw a heartbeat from the master.
763 int cluster_last_hb_ver; // Heartbeat version last seen from master
764 int cluster_num_changes; // Number of changes queued.
765
766 int cluster_mcast_ttl; // TTL for multicast packets
767 int cluster_hb_interval; // How often to send a heartbeat.
768 int cluster_hb_timeout; // How many missed heartbeats trigger an election.
769 uint64_t cluster_table_version; // # state changes processed by cluster
770
771 struct in6_addr ipv6_prefix; // Our IPv6 network pool.
772
773
774 int cluster_master_min_adv; // Master advertises routes while the number of up to date
775 // slaves is less than this value.
776 in_addr_t cli_bind_address; // bind address for CLI
777 char hostname[MAXHOSTNAME]; // hostname (overridden by -h on command line)
778 // Guest change
779 char guest_user[MAXUSER]; // Guest account username
780
781 #ifdef BGP
782 #define BGP_NUM_PEERS 2
783 uint16_t as_number;
784 struct {
785 char name[64];
786 uint16_t as;
787 int keepalive;
788 int hold;
789 struct in_addr update_source;
790 } neighbour[BGP_NUM_PEERS];
791 in_addr_t nexthop_address;
792 struct in6_addr nexthop6_address;
793 #endif
794
795 int echo_timeout; // Time between last packet sent and LCP ECHO generation
796 int idle_echo_timeout; // Time between last packet seen and
797 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
798 in_addr_t iftun_address;
799 #ifdef LAC
800 int disable_lac_func;
801 int auth_tunnel_change_addr_src;
802 int highest_rlnsid;
803 uint16_t bind_portremotelns;
804 in_addr_t bind_address_remotelns;
805 #endif
806 char pppoe_if_to_bind[IFNAMSIZ]; // Name pppoe interface to bind
807 char pppoe_service_name[64]; // pppoe service name
808 char pppoe_ac_name[64];
809 uint8_t pppoe_hwaddr[ETH_ALEN]; // MAC addr of interface pppoe to bind
810 int disable_sending_hello; // Disable l2tp sending HELLO message for Apple compatibility.
811 int disable_no_spoof; // Disable no spoof (permit load balancing client --> internet)
812 int grp_txrate_average_time; // caculation txrate average time (default 10s)
813 } configt;
814
815 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
816 typedef struct
817 {
818 char *key;
819 int offset;
820 int size;
821 enum config_typet type;
822 } config_descriptt;
823
824 typedef struct
825 {
826 uint8_t op; // operation
827 #define FILTER_PORT_OP_NONE 0 // all ports match
828 #define FILTER_PORT_OP_EQ 1
829 #define FILTER_PORT_OP_NEQ 2
830 #define FILTER_PORT_OP_GT 3
831 #define FILTER_PORT_OP_LT 4
832 #define FILTER_PORT_OP_RANGE 5
833 uint16_t port; // port (host byte order)
834 uint16_t port2; // range
835 } ip_filter_portt;
836
837 typedef struct
838 {
839 int action; // permit/deny
840 #define FILTER_ACTION_DENY 1
841 #define FILTER_ACTION_PERMIT 2
842 uint8_t proto; // protocol: IPPROTO_* (netinet/in.h)
843 in_addr_t src_ip; // source ip (network byte order)
844 in_addr_t src_wild;
845 ip_filter_portt src_ports;
846 in_addr_t dst_ip; // dest ip
847 in_addr_t dst_wild;
848 ip_filter_portt dst_ports;
849 uint8_t frag; // apply to non-initial fragments
850 uint8_t tcp_flag_op; // match type: any, all, established
851 #define FILTER_FLAG_OP_ANY 1
852 #define FILTER_FLAG_OP_ALL 2
853 #define FILTER_FLAG_OP_EST 3
854 uint8_t tcp_sflags; // flags set
855 uint8_t tcp_cflags; // flags clear
856 uint32_t counter; // match count
857 } ip_filter_rulet;
858
859 #define TCP_FLAG_FIN 0x01
860 #define TCP_FLAG_SYN 0x02
861 #define TCP_FLAG_RST 0x04
862 #define TCP_FLAG_PSH 0x08
863 #define TCP_FLAG_ACK 0x10
864 #define TCP_FLAG_URG 0x20
865
866 #define MAXFILTER 32
867 #define MAXFILTER_RULES 32
868 typedef struct
869 {
870 char name[32]; // ACL name
871 int extended; // type: 0 = standard, 1 = extended
872 ip_filter_rulet rules[MAXFILTER_RULES];
873 int used; // session ref count
874 } ip_filtert;
875
876 // CDN result/error codes
877 #define CDN_NONE 0, 0
878 #define CDN_TRY_ANOTHER 2, 7
879 #define CDN_ADMIN_DISC 3, 0
880 #define CDN_UNAVAILABLE 4, 0
881
882 // RADIUS Acct-Terminate-Cause values
883 #define TERM_USER_REQUEST 1
884 #define TERM_LOST_CARRIER 2
885 #define TERM_LOST_SERVICE 3
886 #define TERM_IDLE_TIMEOUT 4
887 #define TERM_SESSION_TIMEOUT 5
888 #define TERM_ADMIN_RESET 6
889 #define TERM_ADMIN_REBOOT 7
890 #define TERM_PORT_ERROR 8
891 #define TERM_NAS_ERROR 9
892 #define TERM_NAS_REQUEST 10
893 #define TERM_NAS_REBOOT 11
894 #define TERM_PORT_UNNEEDED 12
895 #define TERM_PORT_PREEMPTED 13
896 #define TERM_PORT_SUSPENDED 14
897 #define TERM_SERVICE_UNAVAILABLE 15
898 #define TERM_CALLBACK 16
899 #define TERM_USER_ERROR 17
900 #define TERM_HOST_REQUEST 18
901 #define TERM_SUPPLICANT_RESTART 19
902 #define TERM_REAUTHENTICATION_FAILURE 20
903 #define TERM_PORT_REINIT 21
904 #define TERM_PORT_DISABLED 22
905
906 // on slaves, alow BGP to withdraw cleanly before exiting
907 #define QUIT_DELAY 5
908
909 // quit actions (master)
910 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
911 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
912
913 // arp.c
914 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
915
916
917 // ppp.c
918 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
919 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
920 void lcp_open(sessionidt s, tunnelidt t);
921 void lcp_restart(sessionidt s);
922 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
923 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
924 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
925 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
926 void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
927 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra);
928 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
929 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
930 void sendchap(sessionidt s, tunnelidt t);
931 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);
932 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);
933 void sendlcp(sessionidt s, tunnelidt t);
934 void send_ipin(sessionidt s, uint8_t *buf, int len);
935 void sendccp(sessionidt s, tunnelidt t);
936 void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
937 int join_bundle(sessionidt s);
938
939
940 // radius.c
941 void initrad(void);
942 void radiussend(uint16_t r, uint8_t state);
943 void processrad(uint8_t *buf, int len, char socket_index);
944 void radiusretry(uint16_t r);
945 uint16_t radiusnew(sessionidt s);
946 void radiusclear(uint16_t r, sessionidt s);
947 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
948 #ifdef LAC
949 int rad_tunnel_pwdecode(uint8_t *pl2tpsecret, size_t *pl2tpsecretlen, const char *radiussecret, const uint8_t * auth);
950 #endif
951
952 // l2tpns.c
953 clockt backoff(uint8_t try);
954 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
955 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
956 sessionidt sessionbyip(in_addr_t ip);
957 sessionidt sessionbyipv6(struct in6_addr ip);
958 sessionidt sessionbyuser(char *username);
959 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
960 void random_data(uint8_t *buf, int len);
961 void sessionkill(sessionidt s, char *reason);
962 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause);
963 void filter_session(sessionidt s, int filter_in, int filter_out);
964 void send_garp(in_addr_t ip);
965 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
966 int tun_write(uint8_t *data, int size);
967 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
968 void sendipcp(sessionidt s, tunnelidt t);
969 void sendipv6cp(sessionidt s, tunnelidt t);
970 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
971 void processipout(uint8_t *buf, int len);
972 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
973 int find_filter(char const *name, size_t len);
974 int ip_filter(uint8_t *buf, int len, uint8_t filter);
975 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
976 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
977 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
978 void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen);
979 ssize_t netlink_send(struct nlmsghdr *nh);
980 void cache_ipmap(in_addr_t ip, sessionidt s);
981
982 #ifdef LAC
983 tunnelidt lac_new_tunnel();
984 void lac_tunnelclear(tunnelidt t);
985 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len);
986 void lac_send_ICRQ(tunnelidt t, sessionidt s);
987 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg);
988 #endif
989
990 // grpsess.c
991 sessionidt grp_getnextsession(groupidt g, in_addr_t ip);
992 void grp_initdata(void);
993 void grp_processvendorspecific(sessionidt s, uint8_t *pvs);
994 groupidt grp_groupbysession(sessionidt s);
995 groupidt grp_groupbyip(in_addr_t ip);
996 void grp_setgrouproute(groupidt g, int add);
997 void grp_time_changed(void);
998 void grp_removesession(groupidt g, sessionidt s);
999
1000 #undef LOG
1001 #undef LOG_HEX
1002 #define LOG(D, s, t, f, ...) ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
1003 #define LOG_HEX(D, t, d, s) ({ if (D <= config->debug) _log_hex(D, t, d, s); })
1004
1005 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
1006 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
1007
1008
1009 int sessionsetup(sessionidt s, tunnelidt t);
1010 int run_plugins(int plugin_type, void *data);
1011 void rebuild_address_pool(void);
1012 void throttle_session(sessionidt s, int rate_in, int rate_out);
1013 int load_session(sessionidt, sessiont *);
1014 void become_master(void); // We're the master; kick off any required master initializations.
1015
1016
1017 // cli.c
1018 void init_cli();
1019 void cli_init_complete(char *hostname);
1020 void cli_do_file(FILE *fh);
1021 void cli_do(int sockfd);
1022 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
1023
1024
1025 // icmp.c
1026 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
1027
1028
1029 extern tunnelt *tunnel;
1030 extern bundlet *bundle;
1031 extern sessiont *session;
1032 extern sessionlocalt *sess_local;
1033 extern ippoolt *ip_address_pool;
1034 extern groupsesst *grpsession;
1035 #define sessionfree (session[0].next)
1036
1037
1038 extern configt *config;
1039 extern time_t basetime; // Time when this process started.
1040 extern time_t time_now; // Seconds since EPOCH.
1041 extern char main_quit;
1042 extern uint32_t last_id;
1043 extern struct Tstats *_statistics;
1044 extern in_addr_t my_address;
1045 extern int clifd;
1046 extern int epollfd;
1047 extern int tunidx; // ifr_ifindex of tun device
1048
1049 struct event_data {
1050 enum {
1051 FD_TYPE_CLI,
1052 FD_TYPE_CLUSTER,
1053 FD_TYPE_TUN,
1054 FD_TYPE_UDP,
1055 FD_TYPE_CONTROL,
1056 FD_TYPE_DAE,
1057 FD_TYPE_RADIUS,
1058 FD_TYPE_BGP,
1059 FD_TYPE_NETLINK,
1060 #ifdef LAC
1061 FD_TYPE_UDPLAC,
1062 #endif
1063 FD_TYPE_PPPOEDISC,
1064 FD_TYPE_PPPOESESS
1065 } type;
1066 int index; // for RADIUS, BGP
1067 };
1068
1069 #define TIME (config->current_time)
1070
1071 extern uint16_t MRU;
1072 extern uint16_t MSS;
1073
1074 // macros for handling help in cli commands
1075 #define CLI_HELP_REQUESTED (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
1076 #define CLI_HELP_NO_ARGS (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
1077
1078 #endif /* __L2TPNS_H__ */