1 /* site.c - manage communication with a remote network site */
3 /* The 'site' code doesn't know anything about the structure of the
4 packets it's transmitting. In fact, under the new netlink
5 configuration scheme it doesn't need to know anything at all about
6 IP addresses, except how to contact its peer. This means it could
7 potentially be used to tunnel other protocols too (IPv6, IPX, plain
8 old Ethernet frames) if appropriate netlink code can be written
9 (and that ought not to be too hard, eg. using the TUN/TAP device to
10 pretend to be an Ethernet interface). */
12 /* At some point in the future the netlink code will be asked for
13 configuration information to go in the PING/PONG packets at the end
14 of the key exchange. */
21 #include <sys/socket.h>
25 #include "unaligned.h"
28 #define SETUP_BUFFER_LEN 2048
30 #define DEFAULT_KEY_LIFETIME (3600*1000) /* [ms] */
31 #define DEFAULT_KEY_RENEGOTIATE_GAP (5*60*1000) /* [ms] */
32 #define DEFAULT_SETUP_RETRIES 5
33 #define DEFAULT_SETUP_RETRY_INTERVAL (2*1000) /* [ms] */
34 #define DEFAULT_WAIT_TIME (20*1000) /* [ms] */
36 #define DEFAULT_MOBILE_KEY_LIFETIME (2*24*3600*1000) /* [ms] */
37 #define DEFAULT_MOBILE_KEY_RENEGOTIATE_GAP (12*3600*1000) /* [ms] */
38 #define DEFAULT_MOBILE_SETUP_RETRIES 30
39 #define DEFAULT_MOBILE_SETUP_RETRY_INTERVAL (1*1000) /* [ms] */
40 #define DEFAULT_MOBILE_WAIT_TIME (10*1000) /* [ms] */
42 #define DEFAULT_MOBILE_PEER_EXPIRY (2*60) /* [s] */
43 #define DEFAULT_MOBILE_PEERS_MAX 3 /* send at most this many copies (default) */
45 /* Each site can be in one of several possible states. */
48 SITE_STOP - nothing is allowed to happen; tunnel is down;
49 all session keys have been erased
50 -> SITE_RUN upon external instruction
51 SITE_RUN - site up, maybe with valid key
52 -> SITE_RESOLVE upon outgoing packet and no valid key
53 we start name resolution for the other end of the tunnel
54 -> SITE_SENTMSG2 upon valid incoming message 1 and suitable time
55 we send an appropriate message 2
56 SITE_RESOLVE - waiting for name resolution
57 -> SITE_SENTMSG1 upon successful resolution
58 we send an appropriate message 1
59 -> SITE_SENTMSG2 upon valid incoming message 1 (then abort resolution)
60 we abort resolution and
61 -> SITE_WAIT on timeout or resolution failure
63 -> SITE_SENTMSG2 upon valid incoming message 1 from higher priority end
64 -> SITE_SENTMSG3 upon valid incoming message 2
65 -> SITE_WAIT on timeout
67 -> SITE_SENTMSG4 upon valid incoming message 3
68 -> SITE_WAIT on timeout
70 -> SITE_SENTMSG5 upon valid incoming message 4
71 -> SITE_WAIT on timeout
73 -> SITE_RUN upon valid incoming message 5
74 -> SITE_WAIT on timeout
76 -> SITE_RUN upon valid incoming message 6
77 -> SITE_WAIT on timeout
78 SITE_WAIT - failed to establish key; do nothing for a while
79 -> SITE_RUN on timeout
84 #define SITE_RESOLVE 2
85 #define SITE_SENTMSG1 3
86 #define SITE_SENTMSG2 4
87 #define SITE_SENTMSG3 5
88 #define SITE_SENTMSG4 6
89 #define SITE_SENTMSG5 7
92 static cstring_t state_name(uint32_t state)
95 case 0: return "STOP";
97 case 2: return "RESOLVE";
98 case 3: return "SENTMSG1";
99 case 4: return "SENTMSG2";
100 case 5: return "SENTMSG3";
101 case 6: return "SENTMSG4";
102 case 7: return "SENTMSG5";
103 case 8: return "WAIT";
104 default: return "*bad state*";
110 #define LOG_UNEXPECTED 0x00000001
111 #define LOG_SETUP_INIT 0x00000002
112 #define LOG_SETUP_TIMEOUT 0x00000004
113 #define LOG_ACTIVATE_KEY 0x00000008
114 #define LOG_TIMEOUT_KEY 0x00000010
115 #define LOG_SEC 0x00000020
116 #define LOG_STATE 0x00000040
117 #define LOG_DROP 0x00000080
118 #define LOG_DUMP 0x00000100
119 #define LOG_ERROR 0x00000400
120 #define LOG_PEER_ADDRS 0x00000800
122 static struct flagstr log_event_table[]={
123 { "unexpected", LOG_UNEXPECTED },
124 { "setup-init", LOG_SETUP_INIT },
125 { "setup-timeout", LOG_SETUP_TIMEOUT },
126 { "activate-key", LOG_ACTIVATE_KEY },
127 { "timeout-key", LOG_TIMEOUT_KEY },
128 { "security", LOG_SEC },
129 { "state-change", LOG_STATE },
130 { "packet-drop", LOG_DROP },
131 { "dump-packets", LOG_DUMP },
132 { "errors", LOG_ERROR },
133 { "peer-addrs", LOG_PEER_ADDRS },
134 { "default", LOG_SETUP_INIT|LOG_SETUP_TIMEOUT|
135 LOG_ACTIVATE_KEY|LOG_TIMEOUT_KEY|LOG_SEC|LOG_ERROR },
136 { "all", 0xffffffff },
141 /***** TRANSPORT PEERS declarations *****/
143 /* Details of "mobile peer" semantics:
145 - We record mobile_peers_max peer address/port numbers ("peers")
146 for key setup, and separately mobile_peers_max for data
147 transfer. If these lists fill up, we retain the newest peers.
148 (For non-mobile peers we only record one of each.)
150 - Outgoing packets are sent to every recorded peer in the
153 - Data transfer peers are straightforward: whenever we successfully
154 process a data packet, we record the peer. Also, whenever we
155 successfully complete a key setup, we merge the key setup
156 peers into the data transfer peers.
158 (For "non-mobile" peers we simply copy the peer used for
159 successful key setup, and don't change the peer otherwise.)
161 - Key setup peers are slightly more complicated.
163 Whenever we receive and successfully process a key exchange
164 packet, we record the peer.
166 Whenever we try to initiate a key setup, we copy the list of data
167 transfer peers and use it for key setup. But we also look to see
168 if the config supplies an address and port number and if so we
169 add that as a key setup peer (possibly evicting one of the data
170 transfer peers we just copied).
172 (For "non-mobile" peers, if we if we have a configured peer
173 address and port, we always use that; otherwise if we have a
174 current data peer address we use that; otherwise we do not
175 attempt to initiate a key setup for lack of a peer address.)
177 "Record the peer" means
178 1. expire any peers last seen >120s ("mobile-peer-expiry") ago
179 2. add the peer of the just received packet to the applicable list
180 (possibly evicting older entries)
181 NB that we do not expire peers until an incoming packet arrives.
185 #define MAX_MOBILE_PEERS_MAX 5 /* send at most this many copies, compiled max */
189 struct comm_addr addr;
193 /* configuration information */
194 /* runtime information */
196 transport_peer peers[MAX_MOBILE_PEERS_MAX];
199 static void transport_peers_clear(struct site *st, transport_peers *peers);
200 static int transport_peers_valid(transport_peers *peers);
201 static void transport_peers_copy(struct site *st, transport_peers *dst,
202 const transport_peers *src);
204 static void transport_setup_msgok(struct site *st, const struct comm_addr *a);
205 static void transport_data_msgok(struct site *st, const struct comm_addr *a);
206 static bool_t transport_compute_setupinit_peers(struct site *st,
207 const struct comm_addr *configured_addr /* 0 if none or not found */);
208 static void transport_record_peer(struct site *st, transport_peers *peers,
209 const struct comm_addr *addr, const char *m);
211 static void transport_xmit(struct site *st, transport_peers *peers,
212 struct buffer_if *buf, bool_t candebug);
214 /***** END of transport peers declarations *****/
220 /* configuration information */
223 bool_t peer_mobile; /* Mobile client support */
224 int32_t transport_peers_max;
225 string_t tunname; /* localname<->remotename by default, used in logs */
226 string_t address; /* DNS name for bootstrapping, optional */
227 int remoteport; /* Port for bootstrapping, optional */
228 struct netlink_if *netlink;
229 struct comm_if **comms;
231 struct resolver_if *resolver;
233 struct random_if *random;
234 struct rsaprivkey_if *privkey;
235 struct rsapubkey_if *pubkey;
236 struct transform_if *transform;
238 struct hash_if *hash;
240 uint32_t index; /* Index of this site */
241 int32_t setup_retries; /* How many times to send setup packets */
242 int32_t setup_retry_interval; /* Initial timeout for setup packets */
243 int32_t wait_timeout; /* How long to wait if setup unsuccessful */
244 int32_t mobile_peer_expiry; /* How long to remember 2ary addresses */
245 int32_t key_lifetime; /* How long a key lasts once set up */
246 int32_t key_renegotiate_time; /* If we see traffic (or a keepalive)
247 after this time, initiate a new
250 uint8_t *setupsig; /* Expected signature of incoming MSG1 packets */
251 int32_t setupsiglen; /* Allows us to discard packets quickly if
252 they are not for us */
253 bool_t setup_priority; /* Do we have precedence if both sites emit
254 message 1 simultaneously? */
257 /* runtime information */
259 uint64_t now; /* Most recently seen time */
261 /* The currently established session */
262 uint32_t remote_session_id;
263 struct transform_inst_if *current_transform;
264 bool_t current_valid;
265 uint64_t current_key_timeout; /* End of life of current key */
266 uint64_t renegotiate_key_time; /* When we can negotiate a new key */
267 transport_peers peers; /* Current address(es) of peer for data traffic */
269 /* The current key setup protocol exchange. We can only be
270 involved in one of these at a time. There's a potential for
271 denial of service here (the attacker keeps sending a setup
272 packet; we keep trying to continue the exchange, and have to
273 timeout before we can listen for another setup packet); perhaps
274 we should keep a list of 'bad' sources for setup packets. */
275 uint32_t setup_session_id;
276 transport_peers setup_peers;
277 uint8_t localN[NONCELEN]; /* Nonces for key exchange */
278 uint8_t remoteN[NONCELEN];
279 struct buffer_if buffer; /* Current outgoing key exchange packet */
280 int32_t retries; /* Number of retries remaining */
281 uint64_t timeout; /* Timeout for current state */
283 uint8_t *sharedsecret;
284 struct transform_inst_if *new_transform; /* For key setup/verify */
287 static void slog(struct site *st, uint32_t event, cstring_t msg, ...)
295 if (event&st->log_events) {
297 case LOG_UNEXPECTED: class=M_INFO; break;
298 case LOG_SETUP_INIT: class=M_INFO; break;
299 case LOG_SETUP_TIMEOUT: class=M_NOTICE; break;
300 case LOG_ACTIVATE_KEY: class=M_INFO; break;
301 case LOG_TIMEOUT_KEY: class=M_INFO; break;
302 case LOG_SEC: class=M_SECURITY; break;
303 case LOG_STATE: class=M_DEBUG; break;
304 case LOG_DROP: class=M_DEBUG; break;
305 case LOG_DUMP: class=M_DEBUG; break;
306 case LOG_ERROR: class=M_ERR; break;
307 case LOG_PEER_ADDRS: class=M_DEBUG; break;
308 default: class=M_ERR; break;
311 vsnprintf(buf,sizeof(buf),msg,ap);
312 st->log->log(st->log->st,class,"%s: %s",st->tunname,buf);
317 static void set_link_quality(struct site *st);
318 static void delete_key(struct site *st, cstring_t reason, uint32_t loglevel);
319 static bool_t initiate_key_setup(struct site *st, cstring_t reason);
320 static void enter_state_run(struct site *st);
321 static bool_t enter_state_resolve(struct site *st);
322 static bool_t enter_new_state(struct site *st,uint32_t next);
323 static void enter_state_wait(struct site *st);
325 #define CHECK_AVAIL(b,l) do { if ((b)->size<(l)) return False; } while(0)
326 #define CHECK_EMPTY(b) do { if ((b)->size!=0) return False; } while(0)
327 #define CHECK_TYPE(b,t) do { uint32_t type; \
328 CHECK_AVAIL((b),4); \
329 type=buf_unprepend_uint32((b)); \
330 if (type!=(t)) return False; } while(0)
349 /* Build any of msg1 to msg4. msg5 and msg6 are built from the inside
350 out using a transform of config data supplied by netlink */
351 static bool_t generate_msg(struct site *st, uint32_t type, cstring_t what)
357 st->retries=st->setup_retries;
358 BUF_ALLOC(&st->buffer,what);
359 buffer_init(&st->buffer,0);
360 buf_append_uint32(&st->buffer,
361 (type==LABEL_MSG1?0:st->setup_session_id));
362 buf_append_uint32(&st->buffer,st->index);
363 buf_append_uint32(&st->buffer,type);
364 buf_append_string(&st->buffer,st->localname);
365 buf_append_string(&st->buffer,st->remotename);
366 memcpy(buf_append(&st->buffer,NONCELEN),st->localN,NONCELEN);
367 if (type==LABEL_MSG1) return True;
368 memcpy(buf_append(&st->buffer,NONCELEN),st->remoteN,NONCELEN);
369 if (type==LABEL_MSG2) return True;
371 if (hacky_par_mid_failnow()) return False;
373 dhpub=st->dh->makepublic(st->dh->st,st->dhsecret,st->dh->len);
374 buf_append_string(&st->buffer,dhpub);
376 hash=safe_malloc(st->hash->len, "generate_msg");
377 hst=st->hash->init();
378 st->hash->update(hst,st->buffer.start,st->buffer.size);
379 st->hash->final(hst,hash);
380 sig=st->privkey->sign(st->privkey->st,hash,st->hash->len);
381 buf_append_string(&st->buffer,sig);
387 static bool_t unpick_msg(struct site *st, uint32_t type,
388 struct buffer_if *msg, struct msg *m)
390 m->hashstart=msg->start;
392 m->dest=buf_unprepend_uint32(msg);
394 m->source=buf_unprepend_uint32(msg);
395 CHECK_TYPE(msg,type);
397 m->remlen=buf_unprepend_uint16(msg);
398 CHECK_AVAIL(msg,m->remlen);
399 m->remote=buf_unprepend(msg,m->remlen);
401 m->loclen=buf_unprepend_uint16(msg);
402 CHECK_AVAIL(msg,m->loclen);
403 m->local=buf_unprepend(msg,m->loclen);
404 CHECK_AVAIL(msg,NONCELEN);
405 m->nR=buf_unprepend(msg,NONCELEN);
406 if (type==LABEL_MSG1) {
410 CHECK_AVAIL(msg,NONCELEN);
411 m->nL=buf_unprepend(msg,NONCELEN);
412 if (type==LABEL_MSG2) {
417 m->pklen=buf_unprepend_uint16(msg);
418 CHECK_AVAIL(msg,m->pklen);
419 m->pk=buf_unprepend(msg,m->pklen);
420 m->hashlen=msg->start-m->hashstart;
422 m->siglen=buf_unprepend_uint16(msg);
423 CHECK_AVAIL(msg,m->siglen);
424 m->sig=buf_unprepend(msg,m->siglen);
429 static bool_t check_msg(struct site *st, uint32_t type, struct msg *m,
432 if (type==LABEL_MSG1) return True;
434 /* Check that the site names and our nonce have been sent
435 back correctly, and then store our peer's nonce. */
436 if (memcmp(m->remote,st->remotename,strlen(st->remotename)!=0)) {
437 *error="wrong remote site name";
440 if (memcmp(m->local,st->localname,strlen(st->localname)!=0)) {
441 *error="wrong local site name";
444 if (memcmp(m->nL,st->localN,NONCELEN)!=0) {
445 *error="wrong locally-generated nonce";
448 if (type==LABEL_MSG2) return True;
449 if (memcmp(m->nR,st->remoteN,NONCELEN)!=0) {
450 *error="wrong remotely-generated nonce";
453 if (type==LABEL_MSG3) return True;
454 if (type==LABEL_MSG4) return True;
455 *error="unknown message type";
459 static bool_t generate_msg1(struct site *st)
461 st->random->generate(st->random->st,NONCELEN,st->localN);
462 return generate_msg(st,LABEL_MSG1,"site:MSG1");
465 static bool_t process_msg1(struct site *st, struct buffer_if *msg1,
466 const struct comm_addr *src)
470 /* We've already determined we're in an appropriate state to
471 process an incoming MSG1, and that the MSG1 has correct values
474 if (!unpick_msg(st,LABEL_MSG1,msg1,&m)) return False;
476 transport_record_peer(st,&st->setup_peers,src,"msg1");
477 st->setup_session_id=m.source;
478 memcpy(st->remoteN,m.nR,NONCELEN);
482 static bool_t generate_msg2(struct site *st)
484 st->random->generate(st->random->st,NONCELEN,st->localN);
485 return generate_msg(st,LABEL_MSG2,"site:MSG2");
488 static bool_t process_msg2(struct site *st, struct buffer_if *msg2,
489 const struct comm_addr *src)
494 if (!unpick_msg(st,LABEL_MSG2,msg2,&m)) return False;
495 if (!check_msg(st,LABEL_MSG2,&m,&err)) {
496 slog(st,LOG_SEC,"msg2: %s",err);
499 st->setup_session_id=m.source;
500 memcpy(st->remoteN,m.nR,NONCELEN);
504 static bool_t generate_msg3(struct site *st)
506 /* Now we have our nonce and their nonce. Think of a secret key,
507 and create message number 3. */
508 st->random->generate(st->random->st,st->dh->len,st->dhsecret);
509 return generate_msg(st,LABEL_MSG3,"site:MSG3");
512 static bool_t process_msg3(struct site *st, struct buffer_if *msg3,
513 const struct comm_addr *src)
520 if (!unpick_msg(st,LABEL_MSG3,msg3,&m)) return False;
521 if (!check_msg(st,LABEL_MSG3,&m,&err)) {
522 slog(st,LOG_SEC,"msg3: %s",err);
526 /* Check signature and store g^x mod m */
527 hash=safe_malloc(st->hash->len, "process_msg3");
528 hst=st->hash->init();
529 st->hash->update(hst,m.hashstart,m.hashlen);
530 st->hash->final(hst,hash);
531 /* Terminate signature with a '0' - cheating, but should be ok */
533 if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) {
534 slog(st,LOG_SEC,"msg3 signature failed check!");
540 /* Terminate their DH public key with a '0' */
542 /* Invent our DH secret key */
543 st->random->generate(st->random->st,st->dh->len,st->dhsecret);
545 /* Generate the shared key */
546 st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk,
547 st->sharedsecret,st->transform->keylen);
549 /* Set up the transform */
550 st->new_transform->setkey(st->new_transform->st,st->sharedsecret,
551 st->transform->keylen);
556 static bool_t generate_msg4(struct site *st)
558 /* We have both nonces, their public key and our private key. Generate
559 our public key, sign it and send it to them. */
560 return generate_msg(st,LABEL_MSG4,"site:MSG4");
563 static bool_t process_msg4(struct site *st, struct buffer_if *msg4,
564 const struct comm_addr *src)
571 if (!unpick_msg(st,LABEL_MSG4,msg4,&m)) return False;
572 if (!check_msg(st,LABEL_MSG4,&m,&err)) {
573 slog(st,LOG_SEC,"msg4: %s",err);
577 /* Check signature and store g^x mod m */
578 hash=safe_malloc(st->hash->len, "process_msg4");
579 hst=st->hash->init();
580 st->hash->update(hst,m.hashstart,m.hashlen);
581 st->hash->final(hst,hash);
582 /* Terminate signature with a '0' - cheating, but should be ok */
584 if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) {
585 slog(st,LOG_SEC,"msg4 signature failed check!");
591 /* Terminate their DH public key with a '0' */
593 /* Generate the shared key */
594 st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk,
595 st->sharedsecret,st->transform->keylen);
596 /* Set up the transform */
597 st->new_transform->setkey(st->new_transform->st,st->sharedsecret,
598 st->transform->keylen);
609 static bool_t unpick_msg0(struct site *st, struct buffer_if *msg0,
613 m->dest=buf_unprepend_uint32(msg0);
615 m->source=buf_unprepend_uint32(msg0);
617 m->type=buf_unprepend_uint32(msg0);
619 /* Leaves transformed part of buffer untouched */
622 static bool_t generate_msg5(struct site *st)
624 cstring_t transform_err;
626 BUF_ALLOC(&st->buffer,"site:MSG5");
627 /* We are going to add four words to the message */
628 buffer_init(&st->buffer,st->transform->max_start_pad+(4*4));
629 /* Give the netlink code an opportunity to put its own stuff in the
630 message (configuration information, etc.) */
631 st->netlink->output_config(st->netlink->st,&st->buffer);
632 buf_prepend_uint32(&st->buffer,LABEL_MSG5);
633 st->new_transform->forwards(st->new_transform->st,&st->buffer,
635 buf_prepend_uint32(&st->buffer,LABEL_MSG5);
636 buf_prepend_uint32(&st->buffer,st->index);
637 buf_prepend_uint32(&st->buffer,st->setup_session_id);
639 st->retries=st->setup_retries;
643 static bool_t process_msg5(struct site *st, struct buffer_if *msg5,
644 const struct comm_addr *src)
647 cstring_t transform_err;
649 if (!unpick_msg0(st,msg5,&m)) return False;
651 if (st->new_transform->reverse(st->new_transform->st,
652 msg5,&transform_err)) {
653 /* There's a problem */
654 slog(st,LOG_SEC,"process_msg5: transform: %s",transform_err);
657 /* Buffer should now contain untransformed PING packet data */
659 if (buf_unprepend_uint32(msg5)!=LABEL_MSG5) {
660 slog(st,LOG_SEC,"MSG5/PING packet contained wrong label");
663 if (!st->netlink->check_config(st->netlink->st,msg5)) {
664 slog(st,LOG_SEC,"MSG5/PING packet contained bad netlink config");
671 static bool_t generate_msg6(struct site *st)
673 cstring_t transform_err;
675 BUF_ALLOC(&st->buffer,"site:MSG6");
676 /* We are going to add four words to the message */
677 buffer_init(&st->buffer,st->transform->max_start_pad+(4*4));
678 /* Give the netlink code an opportunity to put its own stuff in the
679 message (configuration information, etc.) */
680 st->netlink->output_config(st->netlink->st,&st->buffer);
681 buf_prepend_uint32(&st->buffer,LABEL_MSG6);
682 st->new_transform->forwards(st->new_transform->st,&st->buffer,
684 buf_prepend_uint32(&st->buffer,LABEL_MSG6);
685 buf_prepend_uint32(&st->buffer,st->index);
686 buf_prepend_uint32(&st->buffer,st->setup_session_id);
688 st->retries=1; /* Peer will retransmit MSG5 if this packet gets lost */
692 static bool_t process_msg6(struct site *st, struct buffer_if *msg6,
693 const struct comm_addr *src)
696 cstring_t transform_err;
698 if (!unpick_msg0(st,msg6,&m)) return False;
700 if (st->new_transform->reverse(st->new_transform->st,
701 msg6,&transform_err)) {
702 /* There's a problem */
703 slog(st,LOG_SEC,"process_msg6: transform: %s",transform_err);
706 /* Buffer should now contain untransformed PING packet data */
708 if (buf_unprepend_uint32(msg6)!=LABEL_MSG6) {
709 slog(st,LOG_SEC,"MSG6/PONG packet contained invalid data");
712 if (!st->netlink->check_config(st->netlink->st,msg6)) {
713 slog(st,LOG_SEC,"MSG6/PONG packet contained bad netlink config");
720 static bool_t process_msg0(struct site *st, struct buffer_if *msg0,
721 const struct comm_addr *src)
724 cstring_t transform_err;
727 if (!st->current_valid) {
728 slog(st,LOG_DROP,"incoming message but no current key -> dropping");
729 return initiate_key_setup(st,"incoming message but no current key");
732 if (!unpick_msg0(st,msg0,&m)) return False;
734 if (st->current_transform->reverse(st->current_transform->st,
735 msg0,&transform_err)) {
736 /* There's a problem */
737 slog(st,LOG_SEC,"transform: %s",transform_err);
738 return initiate_key_setup(st,"incoming message would not decrypt");
741 type=buf_unprepend_uint32(msg0);
744 /* We must forget about the current session. */
745 delete_key(st,"request from peer",LOG_SEC);
748 /* Deliver to netlink layer */
749 st->netlink->deliver(st->netlink->st,msg0);
750 transport_data_msgok(st,src);
751 /* See whether we should start negotiating a new key */
752 if (st->now > st->renegotiate_key_time)
753 initiate_key_setup(st,"incoming packet in renegotiation window");
756 slog(st,LOG_SEC,"incoming encrypted message of type %08x "
763 static void dump_packet(struct site *st, struct buffer_if *buf,
764 const struct comm_addr *addr, bool_t incoming)
766 uint32_t dest=ntohl(*(uint32_t *)buf->start);
767 uint32_t source=ntohl(*(uint32_t *)(buf->start+4));
768 uint32_t msgtype=ntohl(*(uint32_t *)(buf->start+8));
770 if (st->log_events & LOG_DUMP)
771 slilog(st->log,M_DEBUG,"%s: %s: %08x<-%08x: %08x:",
772 st->tunname,incoming?"incoming":"outgoing",
773 dest,source,msgtype);
776 static uint32_t site_status(void *st)
781 static bool_t send_msg(struct site *st)
784 transport_xmit(st, &st->setup_peers, &st->buffer, True);
785 st->timeout=st->now+st->setup_retry_interval;
789 slog(st,LOG_SETUP_TIMEOUT,"timed out sending key setup packet "
790 "(in state %s)",state_name(st->state));
791 enter_state_wait(st);
796 static void site_resolve_callback(void *sst, struct in_addr *address)
799 struct comm_addr ca_buf, *ca_use=0;
801 if (st->state!=SITE_RESOLVE) {
802 slog(st,LOG_UNEXPECTED,"site_resolve_callback called unexpectedly");
806 struct sockaddr_in sin;
808 sin.sin_family=AF_INET;
809 sin.sin_port=htons(st->remoteport);
810 sin.sin_addr=*address;
811 if (st->comms[0]->addr_construct(st->comms[0]->st, &ca_buf, &sin)) {
815 slog(st,LOG_ERROR,"resolution of %s failed",st->address);
817 if (transport_compute_setupinit_peers(st,ca_use)) {
818 enter_new_state(st,SITE_SENTMSG1);
820 /* Can't figure out who to try to to talk to */
821 slog(st,LOG_SETUP_INIT,"key exchange failed: cannot find peer address");
826 static bool_t initiate_key_setup(struct site *st, cstring_t reason)
828 if (st->state!=SITE_RUN) return False;
829 slog(st,LOG_SETUP_INIT,"initiating key exchange (%s)",reason);
831 slog(st,LOG_SETUP_INIT,"resolving peer address");
832 return enter_state_resolve(st);
833 } else if (transport_compute_setupinit_peers(st,0)) {
834 return enter_new_state(st,SITE_SENTMSG1);
836 slog(st,LOG_SETUP_INIT,"key exchange failed: no address for peer");
840 static void activate_new_key(struct site *st)
842 struct transform_inst_if *t;
844 /* We have two transform instances, which we swap between active
846 t=st->current_transform;
847 st->current_transform=st->new_transform;
852 st->current_valid=True;
853 st->current_key_timeout=st->now+st->key_lifetime;
854 st->renegotiate_key_time=st->now+st->key_renegotiate_time;
855 transport_peers_copy(st,&st->peers,&st->setup_peers);
856 st->remote_session_id=st->setup_session_id;
858 slog(st,LOG_ACTIVATE_KEY,"new key activated");
862 static void delete_key(struct site *st, cstring_t reason, uint32_t loglevel)
864 if (st->current_valid) {
865 slog(st,loglevel,"session closed (%s)",reason);
867 st->current_valid=False;
868 st->current_transform->delkey(st->current_transform->st);
869 st->current_key_timeout=0;
870 set_link_quality(st);
874 static void state_assert(struct site *st, bool_t ok)
876 if (!ok) fatal("site:state_assert");
879 static void enter_state_stop(struct site *st)
883 delete_key(st,"entering state STOP",LOG_TIMEOUT_KEY);
884 st->new_transform->delkey(st->new_transform->st);
887 static void set_link_quality(struct site *st)
890 if (st->current_valid)
891 quality=LINK_QUALITY_UP;
892 else if (st->state==SITE_WAIT || st->state==SITE_STOP)
893 quality=LINK_QUALITY_DOWN;
894 else if (st->address)
895 quality=LINK_QUALITY_DOWN_CURRENT_ADDRESS;
896 else if (transport_peers_valid(&st->peers))
897 quality=LINK_QUALITY_DOWN_STALE_ADDRESS;
899 quality=LINK_QUALITY_DOWN;
901 st->netlink->set_quality(st->netlink->st,quality);
904 static void enter_state_run(struct site *st)
906 slog(st,LOG_STATE,"entering state RUN");
910 st->setup_session_id=0;
911 transport_peers_clear(st,&st->setup_peers);
912 memset(st->localN,0,NONCELEN);
913 memset(st->remoteN,0,NONCELEN);
914 st->new_transform->delkey(st->new_transform->st);
915 memset(st->dhsecret,0,st->dh->len);
916 memset(st->sharedsecret,0,st->transform->keylen);
917 set_link_quality(st);
920 static bool_t enter_state_resolve(struct site *st)
922 state_assert(st,st->state==SITE_RUN);
923 slog(st,LOG_STATE,"entering state RESOLVE");
924 st->state=SITE_RESOLVE;
925 st->resolver->request(st->resolver->st,st->address,
926 site_resolve_callback,st);
930 static bool_t enter_new_state(struct site *st, uint32_t next)
932 bool_t (*gen)(struct site *st);
935 slog(st,LOG_STATE,"entering state %s",state_name(next));
938 state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE);
942 state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE ||
943 st->state==SITE_SENTMSG1 || st->state==SITE_WAIT);
947 state_assert(st,st->state==SITE_SENTMSG1);
948 BUF_FREE(&st->buffer);
952 state_assert(st,st->state==SITE_SENTMSG2);
953 BUF_FREE(&st->buffer);
957 state_assert(st,st->state==SITE_SENTMSG3);
958 BUF_FREE(&st->buffer);
962 state_assert(st,st->state==SITE_SENTMSG4);
963 BUF_FREE(&st->buffer);
968 fatal("enter_new_state(%s): invalid new state",state_name(next));
972 if (hacky_par_start_failnow()) return False;
974 r= gen(st) && send_msg(st);
977 st->setup_retries, st->setup_retry_interval,
982 if (next==SITE_RUN) {
983 BUF_FREE(&st->buffer); /* Never reused */
984 st->timeout=0; /* Never retransmit */
985 activate_new_key(st);
989 slog(st,LOG_ERROR,"error entering state %s",state_name(next));
990 st->buffer.free=False; /* Unconditionally use the buffer; it may be
991 in either state, and enter_state_wait() will
993 enter_state_wait(st);
997 /* msg7 tells our peer that we're about to forget our key */
998 static bool_t send_msg7(struct site *st, cstring_t reason)
1000 cstring_t transform_err;
1002 if (st->current_valid && st->buffer.free
1003 && transport_peers_valid(&st->peers)) {
1004 BUF_ALLOC(&st->buffer,"site:MSG7");
1005 buffer_init(&st->buffer,st->transform->max_start_pad+(4*3));
1006 buf_append_uint32(&st->buffer,LABEL_MSG7);
1007 buf_append_string(&st->buffer,reason);
1008 st->current_transform->forwards(st->current_transform->st,
1009 &st->buffer, &transform_err);
1010 buf_prepend_uint32(&st->buffer,LABEL_MSG0);
1011 buf_prepend_uint32(&st->buffer,st->index);
1012 buf_prepend_uint32(&st->buffer,st->remote_session_id);
1013 transport_xmit(st,&st->peers,&st->buffer,True);
1014 BUF_FREE(&st->buffer);
1020 /* We go into this state if our peer becomes uncommunicative. Similar to
1021 the "stop" state, we forget all session keys for a while, before
1022 re-entering the "run" state. */
1023 static void enter_state_wait(struct site *st)
1025 slog(st,LOG_STATE,"entering state WAIT");
1026 st->timeout=st->now+st->wait_timeout;
1027 st->state=SITE_WAIT;
1028 set_link_quality(st);
1029 BUF_FREE(&st->buffer); /* will have had an outgoing packet in it */
1030 /* XXX Erase keys etc. */
1033 static inline void site_settimeout(uint64_t timeout, int *timeout_io)
1036 int64_t offset=timeout-*now;
1037 if (offset<0) offset=0;
1038 if (offset>INT_MAX) offset=INT_MAX;
1039 if (*timeout_io<0 || offset<*timeout_io)
1044 static int site_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
1047 struct site *st=sst;
1049 *nfds_io=0; /* We don't use any file descriptors */
1052 /* Work out when our next timeout is. The earlier of 'timeout' or
1053 'current_key_timeout'. A stored value of '0' indicates no timeout
1055 site_settimeout(st->timeout, timeout_io);
1056 site_settimeout(st->current_key_timeout, timeout_io);
1058 return 0; /* success */
1061 /* NB site_afterpoll will be called before site_beforepoll is ever called */
1062 static void site_afterpoll(void *sst, struct pollfd *fds, int nfds)
1064 struct site *st=sst;
1067 if (st->timeout && *now>st->timeout) {
1069 if (st->state>=SITE_SENTMSG1 && st->state<=SITE_SENTMSG5) {
1070 if (!hacky_par_start_failnow())
1072 } else if (st->state==SITE_WAIT) {
1073 enter_state_run(st);
1075 slog(st,LOG_ERROR,"site_afterpoll: unexpected timeout, state=%d",
1079 if (st->current_key_timeout && *now>st->current_key_timeout) {
1080 delete_key(st,"maximum key life exceeded",LOG_TIMEOUT_KEY);
1084 /* This function is called by the netlink device to deliver packets
1085 intended for the remote network. The packet is in "raw" wire
1086 format, but is guaranteed to be word-aligned. */
1087 static void site_outgoing(void *sst, struct buffer_if *buf)
1089 struct site *st=sst;
1090 cstring_t transform_err;
1092 if (st->state==SITE_STOP) {
1097 /* In all other states we consider delivering the packet if we have
1098 a valid key and a valid address to send it to. */
1099 if (st->current_valid && transport_peers_valid(&st->peers)) {
1100 /* Transform it and send it */
1102 buf_prepend_uint32(buf,LABEL_MSG9);
1103 st->current_transform->forwards(st->current_transform->st,
1104 buf, &transform_err);
1105 buf_prepend_uint32(buf,LABEL_MSG0);
1106 buf_prepend_uint32(buf,st->index);
1107 buf_prepend_uint32(buf,st->remote_session_id);
1108 transport_xmit(st,&st->peers,buf,False);
1114 slog(st,LOG_DROP,"discarding outgoing packet of size %d",buf->size);
1116 initiate_key_setup(st,"outgoing packet");
1119 /* This function is called by the communication device to deliver
1120 packets from our peers. */
1121 static bool_t site_incoming(void *sst, struct buffer_if *buf,
1122 const struct comm_addr *source)
1124 struct site *st=sst;
1125 uint32_t dest=ntohl(*(uint32_t *)buf->start);
1128 /* It could be for any site - it should have LABEL_MSG1 and
1129 might have our name and our peer's name in it */
1130 if (buf->size<(st->setupsiglen+8+NONCELEN)) return False;
1131 if (memcmp(buf->start+8,st->setupsig,st->setupsiglen)==0) {
1132 /* It's addressed to us. Decide what to do about it. */
1133 dump_packet(st,buf,source,True);
1134 if (st->state==SITE_RUN || st->state==SITE_RESOLVE ||
1135 st->state==SITE_WAIT) {
1136 /* We should definitely process it */
1137 if (process_msg1(st,buf,source)) {
1138 slog(st,LOG_SETUP_INIT,"key setup initiated by peer");
1139 enter_new_state(st,SITE_SENTMSG2);
1141 slog(st,LOG_ERROR,"failed to process incoming msg1");
1145 } else if (st->state==SITE_SENTMSG1) {
1146 /* We've just sent a message 1! They may have crossed on
1147 the wire. If we have priority then we ignore the
1148 incoming one, otherwise we process it as usual. */
1149 if (st->setup_priority) {
1151 slog(st,LOG_DUMP,"crossed msg1s; we are higher "
1152 "priority => ignore incoming msg1");
1155 slog(st,LOG_DUMP,"crossed msg1s; we are lower "
1156 "priority => use incoming msg1");
1157 if (process_msg1(st,buf,source)) {
1158 BUF_FREE(&st->buffer); /* Free our old message 1 */
1159 enter_new_state(st,SITE_SENTMSG2);
1161 slog(st,LOG_ERROR,"failed to process an incoming "
1162 "crossed msg1 (we have low priority)");
1168 /* The message 1 was received at an unexpected stage of the
1169 key setup. XXX POLICY - what do we do? */
1170 slog(st,LOG_UNEXPECTED,"unexpected incoming message 1");
1174 return False; /* Not for us. */
1176 if (dest==st->index) {
1177 /* Explicitly addressed to us */
1178 uint32_t msgtype=ntohl(get_uint32(buf->start+8));
1179 if (msgtype!=LABEL_MSG0) dump_packet(st,buf,source,True);
1182 /* If the source is our current peer then initiate a key setup,
1183 because our peer's forgotten the key */
1184 if (get_uint32(buf->start+4)==st->remote_session_id) {
1185 initiate_key_setup(st,"received a NAK");
1187 slog(st,LOG_SEC,"bad incoming NAK");
1191 process_msg0(st,buf,source);
1194 /* Setup packet: should not have been explicitly addressed
1196 slog(st,LOG_SEC,"incoming explicitly addressed msg1");
1199 /* Setup packet: expected only in state SENTMSG1 */
1200 if (st->state!=SITE_SENTMSG1) {
1201 slog(st,LOG_UNEXPECTED,"unexpected MSG2");
1202 } else if (process_msg2(st,buf,source)) {
1203 transport_setup_msgok(st,source);
1204 enter_new_state(st,SITE_SENTMSG3);
1206 slog(st,LOG_SEC,"invalid MSG2");
1210 /* Setup packet: expected only in state SENTMSG2 */
1211 if (st->state!=SITE_SENTMSG2) {
1212 slog(st,LOG_UNEXPECTED,"unexpected MSG3");
1213 } else if (process_msg3(st,buf,source)) {
1214 transport_setup_msgok(st,source);
1215 enter_new_state(st,SITE_SENTMSG4);
1217 slog(st,LOG_SEC,"invalid MSG3");
1221 /* Setup packet: expected only in state SENTMSG3 */
1222 if (st->state!=SITE_SENTMSG3) {
1223 slog(st,LOG_UNEXPECTED,"unexpected MSG4");
1224 } else if (process_msg4(st,buf,source)) {
1225 transport_setup_msgok(st,source);
1226 enter_new_state(st,SITE_SENTMSG5);
1228 slog(st,LOG_SEC,"invalid MSG4");
1232 /* Setup packet: expected only in state SENTMSG4 */
1233 /* (may turn up in state RUN if our return MSG6 was lost
1234 and the new key has already been activated. In that
1235 case we should treat it as an ordinary PING packet. We
1236 can't pass it to process_msg5() because the
1237 new_transform will now be unkeyed. XXX) */
1238 if (st->state!=SITE_SENTMSG4) {
1239 slog(st,LOG_UNEXPECTED,"unexpected MSG5");
1240 } else if (process_msg5(st,buf,source)) {
1241 transport_setup_msgok(st,source);
1242 enter_new_state(st,SITE_RUN);
1244 slog(st,LOG_SEC,"invalid MSG5");
1248 /* Setup packet: expected only in state SENTMSG5 */
1249 if (st->state!=SITE_SENTMSG5) {
1250 slog(st,LOG_UNEXPECTED,"unexpected MSG6");
1251 } else if (process_msg6(st,buf,source)) {
1252 BUF_FREE(&st->buffer); /* Free message 5 */
1253 transport_setup_msgok(st,source);
1254 activate_new_key(st);
1256 slog(st,LOG_SEC,"invalid MSG6");
1260 slog(st,LOG_SEC,"received message of unknown type 0x%08x",
1271 static void site_control(void *vst, bool_t run)
1273 struct site *st=vst;
1274 if (run) enter_state_run(st);
1275 else enter_state_stop(st);
1278 static void site_phase_hook(void *sst, uint32_t newphase)
1280 struct site *st=sst;
1282 /* The program is shutting down; tell our peer */
1283 send_msg7(st,"shutting down");
1286 static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context,
1289 static uint32_t index_sequence;
1295 st=safe_malloc(sizeof(*st),"site_apply");
1297 st->cl.description="site";
1298 st->cl.type=CL_SITE;
1300 st->cl.interface=&st->ops;
1302 st->ops.control=site_control;
1303 st->ops.status=site_status;
1305 /* First parameter must be a dict */
1306 item=list_elem(args,0);
1307 if (!item || item->type!=t_dict)
1308 cfgfatal(loc,"site","parameter must be a dictionary\n");
1310 dict=item->data.dict;
1311 st->localname=dict_read_string(dict, "local-name", True, "site", loc);
1312 st->remotename=dict_read_string(dict, "name", True, "site", loc);
1314 st->peer_mobile=dict_read_bool(dict,"mobile",False,"site",loc,False);
1315 bool_t local_mobile=
1316 dict_read_bool(dict,"local-mobile",False,"site",loc,False);
1318 /* Sanity check (which also allows the 'sites' file to include
1319 site() closures for all sites including our own): refuse to
1320 talk to ourselves */
1321 if (strcmp(st->localname,st->remotename)==0) {
1322 Message(M_DEBUG,"site %s: local-name==name -> ignoring this site\n",
1324 if (st->peer_mobile != local_mobile)
1325 cfgfatal(loc,"site","site %s's peer-mobile=%d"
1326 " but our local-mobile=%d\n",
1327 st->localname, st->peer_mobile, local_mobile);
1331 if (st->peer_mobile && local_mobile) {
1332 Message(M_WARNING,"site %s: site is mobile but so are we"
1333 " -> ignoring this site\n", st->remotename);
1338 assert(index_sequence < 0xffffffffUL);
1339 st->index = ++index_sequence;
1340 st->netlink=find_cl_if(dict,"link",CL_NETLINK,True,"site",loc);
1342 list_t *comms_cfg=dict_lookup(dict,"comm");
1343 if (!comms_cfg) cfgfatal(loc,"site","closure list \"comm\" not found");
1344 st->ncomms=list_length(comms_cfg);
1345 st->comms=safe_malloc_ary(sizeof(*st->comms),st->ncomms,"comms");
1347 for (i=0; i<st->ncomms; i++) {
1348 item_t *item=list_elem(comms_cfg,i);
1349 if (item->type!=t_closure) cfgfatal(loc,"site","comm is not a closure");
1350 closure_t *cl=item->data.closure;
1351 if (cl->type!=CL_COMM) cfgfatal(loc,"site","comm closure wrong type");
1352 st->comms[i]=cl->interface;
1355 st->resolver=find_cl_if(dict,"resolver",CL_RESOLVER,True,"site",loc);
1356 st->log=find_cl_if(dict,"log",CL_LOG,True,"site",loc);
1357 st->random=find_cl_if(dict,"random",CL_RANDOMSRC,True,"site",loc);
1359 st->privkey=find_cl_if(dict,"local-key",CL_RSAPRIVKEY,True,"site",loc);
1360 st->address=dict_read_string(dict, "address", False, "site", loc);
1362 st->remoteport=dict_read_number(dict,"port",True,"site",loc,0);
1363 else st->remoteport=0;
1364 st->pubkey=find_cl_if(dict,"key",CL_RSAPUBKEY,True,"site",loc);
1367 find_cl_if(dict,"transform",CL_TRANSFORM,True,"site",loc);
1369 st->dh=find_cl_if(dict,"dh",CL_DH,True,"site",loc);
1370 st->hash=find_cl_if(dict,"hash",CL_HASH,True,"site",loc);
1372 #define DEFAULT(D) (st->peer_mobile || local_mobile \
1373 ? DEFAULT_MOBILE_##D : DEFAULT_##D)
1374 #define CFG_NUMBER(k,D) dict_read_number(dict,(k),False,"site",loc,DEFAULT(D));
1376 st->key_lifetime= CFG_NUMBER("key-lifetime", KEY_LIFETIME);
1377 st->setup_retries= CFG_NUMBER("setup-retries", SETUP_RETRIES);
1378 st->setup_retry_interval= CFG_NUMBER("setup-timeout", SETUP_RETRY_INTERVAL);
1379 st->wait_timeout= CFG_NUMBER("wait-time", WAIT_TIME);
1381 st->mobile_peer_expiry= dict_read_number(
1382 dict,"mobile-peer-expiry",False,"site",loc,DEFAULT_MOBILE_PEER_EXPIRY);
1384 st->transport_peers_max= !st->peer_mobile ? 1 : dict_read_number(
1385 dict,"mobile-peers-max",False,"site",loc,DEFAULT_MOBILE_PEERS_MAX);
1386 if (st->transport_peers_max<1 ||
1387 st->transport_peers_max>=MAX_MOBILE_PEERS_MAX) {
1388 cfgfatal(loc,"site","mobile-peers-max must be in range 1.."
1389 STRING(MAX_MOBILE_PEERS_MAX) "\n");
1392 if (st->key_lifetime < DEFAULT(KEY_RENEGOTIATE_GAP)*2)
1393 st->key_renegotiate_time=st->key_lifetime/2;
1395 st->key_renegotiate_time=st->key_lifetime-DEFAULT(KEY_RENEGOTIATE_GAP);
1396 st->key_renegotiate_time=dict_read_number(
1397 dict,"renegotiate-time",False,"site",loc,st->key_renegotiate_time);
1398 if (st->key_renegotiate_time > st->key_lifetime) {
1399 cfgfatal(loc,"site",
1400 "renegotiate-time must be less than key-lifetime\n");
1403 st->log_events=string_list_to_word(dict_lookup(dict,"log-events"),
1404 log_event_table,"site");
1406 st->tunname=safe_malloc(strlen(st->localname)+strlen(st->remotename)+5,
1408 sprintf(st->tunname,"%s<->%s",st->localname,st->remotename);
1410 /* The information we expect to see in incoming messages of type 1 */
1411 /* fixme: lots of unchecked overflows here, but the results are only
1412 corrupted packets rather than undefined behaviour */
1413 st->setupsiglen=strlen(st->remotename)+strlen(st->localname)+8;
1414 st->setupsig=safe_malloc(st->setupsiglen,"site_apply");
1415 put_uint32(st->setupsig+0,LABEL_MSG1);
1416 put_uint16(st->setupsig+4,strlen(st->remotename));
1417 memcpy(&st->setupsig[6],st->remotename,strlen(st->remotename));
1418 put_uint16(st->setupsig+(6+strlen(st->remotename)),strlen(st->localname));
1419 memcpy(&st->setupsig[8+strlen(st->remotename)],st->localname,
1420 strlen(st->localname));
1421 st->setup_priority=(strcmp(st->localname,st->remotename)>0);
1423 buffer_new(&st->buffer,SETUP_BUFFER_LEN);
1425 /* We are interested in poll(), but only for timeouts. We don't have
1426 any fds of our own. */
1427 register_for_poll(st, site_beforepoll, site_afterpoll, 0, "site");
1430 st->current_valid=False;
1431 st->current_key_timeout=0;
1432 transport_peers_clear(st,&st->peers);
1433 transport_peers_clear(st,&st->setup_peers);
1434 /* XXX mlock these */
1435 st->dhsecret=safe_malloc(st->dh->len,"site:dhsecret");
1436 st->sharedsecret=safe_malloc(st->transform->keylen,"site:sharedsecret");
1438 /* We need to compute some properties of our comms */
1439 #define COMPUTE_WORST(pad) \
1440 int worst_##pad=0; \
1441 for (i=0; i<st->ncomms; i++) { \
1442 int thispad=st->comms[i]->pad; \
1443 if (thispad > worst_##pad) \
1444 worst_##pad=thispad; \
1446 COMPUTE_WORST(min_start_pad)
1447 COMPUTE_WORST(min_end_pad)
1449 /* We need to register the remote networks with the netlink device */
1450 st->netlink->reg(st->netlink->st, site_outgoing, st,
1451 st->transform->max_start_pad+(4*4)+
1452 worst_min_start_pad,
1453 st->transform->max_end_pad+worst_min_end_pad);
1455 for (i=0; i<st->ncomms; i++)
1456 st->comms[i]->request_notify(st->comms[i]->st, st, site_incoming);
1458 st->current_transform=st->transform->create(st->transform->st);
1459 st->new_transform=st->transform->create(st->transform->st);
1461 enter_state_stop(st);
1463 add_hook(PHASE_SHUTDOWN,site_phase_hook,st);
1465 return new_closure(&st->cl);
1468 void site_module(dict_t *dict)
1470 add_closure(dict,"site",site_apply);
1474 /***** TRANSPORT PEERS definitions *****/
1476 static void transport_peers_debug(struct site *st, transport_peers *dst,
1477 const char *didwhat,
1478 int nargs, const struct comm_addr *args,
1483 if (!(st->log_events & LOG_PEER_ADDRS))
1484 return; /* an optimisation */
1486 slog(st, LOG_PEER_ADDRS, "peers (%s) %s nargs=%d => npeers=%d",
1487 (dst==&st->peers ? "data" :
1488 dst==&st->setup_peers ? "setup" : "UNKNOWN"),
1489 didwhat, nargs, dst->npeers);
1491 for (i=0, argp=(void*)args;
1493 i++, (argp+=stride?stride:sizeof(*args))) {
1494 const struct comm_addr *ca=(void*)argp;
1495 slog(st, LOG_PEER_ADDRS, " args: addrs[%d]=%s",
1496 i, ca->comm->addr_to_string(ca->comm->st,ca));
1498 for (i=0; i<dst->npeers; i++) {
1499 struct timeval diff;
1500 timersub(tv_now,&dst->peers[i].last,&diff);
1501 const struct comm_addr *ca=&dst->peers[i].addr;
1502 slog(st, LOG_PEER_ADDRS, " peers: addrs[%d]=%s T-%ld.%06ld",
1503 i, ca->comm->addr_to_string(ca->comm->st,ca),
1504 (unsigned long)diff.tv_sec, (unsigned long)diff.tv_usec);
1508 static int transport_peer_compar(const void *av, const void *bv) {
1509 const transport_peer *a=av;
1510 const transport_peer *b=bv;
1511 /* put most recent first in the array */
1512 if (timercmp(&a->last, &b->last, <)) return +1;
1513 if (timercmp(&a->last, &b->last, >)) return -11;
1517 static void transport_peers_expire(struct site *st, transport_peers *peers) {
1518 /* peers must be sorted first */
1519 int previous_peers=peers->npeers;
1520 struct timeval oldest;
1521 oldest.tv_sec = tv_now->tv_sec - st->mobile_peer_expiry;
1522 oldest.tv_usec = tv_now->tv_usec;
1523 while (peers->npeers>1 &&
1524 timercmp(&peers->peers[peers->npeers-1].last, &oldest, <))
1526 if (peers->npeers != previous_peers)
1527 transport_peers_debug(st,peers,"expire", 0,0,0);
1530 static void transport_record_peer(struct site *st, transport_peers *peers,
1531 const struct comm_addr *addr, const char *m) {
1532 int slot, changed=0;
1534 for (slot=0; slot<peers->npeers; slot++)
1535 if (!memcmp(&peers->peers[slot].addr, addr, sizeof(*addr)))
1539 if (peers->npeers==st->transport_peers_max)
1540 slot=st->transport_peers_max;
1542 slot=peers->npeers++;
1545 peers->peers[slot].addr=*addr;
1546 peers->peers[slot].last=*tv_now;
1548 if (peers->npeers>1)
1549 qsort(peers->peers, peers->npeers,
1550 sizeof(*peers->peers), transport_peer_compar);
1552 if (changed || peers->npeers!=1)
1553 transport_peers_debug(st,peers,m, 1,addr,0);
1554 transport_peers_expire(st, peers);
1557 static bool_t transport_compute_setupinit_peers(struct site *st,
1558 const struct comm_addr *configured_addr /* 0 if none or not found */) {
1560 if (!configured_addr && !transport_peers_valid(&st->peers))
1563 slog(st,LOG_SETUP_INIT,
1564 (!configured_addr ? "using only %d old peer address(es)"
1565 : "using configured address, and/or perhaps %d old peer address(es)"),
1568 /* Non-mobile peers havve st->peers.npeers==0 or ==1, since they
1569 * have transport_peers_max==1. The effect is that this code
1570 * always uses the configured address if supplied, or otherwise
1571 * the existing data peer if one exists; this is as desired. */
1573 transport_peers_copy(st,&st->setup_peers,&st->peers);
1575 if (configured_addr)
1576 transport_record_peer(st,&st->setup_peers,configured_addr,"setupinit");
1578 assert(transport_peers_valid(&st->setup_peers));
1582 static void transport_setup_msgok(struct site *st, const struct comm_addr *a) {
1583 if (st->peer_mobile)
1584 transport_record_peer(st,&st->setup_peers,a,"setupmsg");
1586 static void transport_data_msgok(struct site *st, const struct comm_addr *a) {
1587 if (st->peer_mobile)
1588 transport_record_peer(st,&st->peers,a,"datamsg");
1591 static int transport_peers_valid(transport_peers *peers) {
1592 return peers->npeers;
1594 static void transport_peers_clear(struct site *st, transport_peers *peers) {
1596 transport_peers_debug(st,peers,"clear",0,0,0);
1598 static void transport_peers_copy(struct site *st, transport_peers *dst,
1599 const transport_peers *src) {
1600 dst->npeers=src->npeers;
1601 memcpy(dst->peers, src->peers, sizeof(*dst->peers) * dst->npeers);
1602 transport_peers_debug(st,dst,"copy",
1603 src->npeers, &src->peers->addr, sizeof(src->peers));
1606 void transport_xmit(struct site *st, transport_peers *peers,
1607 struct buffer_if *buf, bool_t candebug) {
1609 transport_peers_expire(st, peers);
1610 for (slot=0; slot<peers->npeers; slot++) {
1611 transport_peer *peer=&peers->peers[slot];
1613 dump_packet(st, buf, &peer->addr, False);
1614 peer->addr.comm->sendmsg(peer->addr.comm->st, buf, &peer->addr);
1618 /***** END of transport peers declarations *****/