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 buf_prepend_uint32(&st->buffer,LABEL_MSG5);
632 st->new_transform->forwards(st->new_transform->st,&st->buffer,
634 buf_prepend_uint32(&st->buffer,LABEL_MSG5);
635 buf_prepend_uint32(&st->buffer,st->index);
636 buf_prepend_uint32(&st->buffer,st->setup_session_id);
638 st->retries=st->setup_retries;
642 static bool_t process_msg5(struct site *st, struct buffer_if *msg5,
643 const struct comm_addr *src)
646 cstring_t transform_err;
648 if (!unpick_msg0(st,msg5,&m)) return False;
650 if (st->new_transform->reverse(st->new_transform->st,
651 msg5,&transform_err)) {
652 /* There's a problem */
653 slog(st,LOG_SEC,"process_msg5: transform: %s",transform_err);
656 /* Buffer should now contain untransformed PING packet data */
658 if (buf_unprepend_uint32(msg5)!=LABEL_MSG5) {
659 slog(st,LOG_SEC,"MSG5/PING packet contained wrong label");
662 /* Older versions of secnet used to write some config data here
663 * which we ignore. So we don't CHECK_EMPTY */
667 static bool_t generate_msg6(struct site *st)
669 cstring_t transform_err;
671 BUF_ALLOC(&st->buffer,"site:MSG6");
672 /* We are going to add four words to the message */
673 buffer_init(&st->buffer,st->transform->max_start_pad+(4*4));
674 /* Give the netlink code an opportunity to put its own stuff in the
675 message (configuration information, etc.) */
676 buf_prepend_uint32(&st->buffer,LABEL_MSG6);
677 st->new_transform->forwards(st->new_transform->st,&st->buffer,
679 buf_prepend_uint32(&st->buffer,LABEL_MSG6);
680 buf_prepend_uint32(&st->buffer,st->index);
681 buf_prepend_uint32(&st->buffer,st->setup_session_id);
683 st->retries=1; /* Peer will retransmit MSG5 if this packet gets lost */
687 static bool_t process_msg6(struct site *st, struct buffer_if *msg6,
688 const struct comm_addr *src)
691 cstring_t transform_err;
693 if (!unpick_msg0(st,msg6,&m)) return False;
695 if (st->new_transform->reverse(st->new_transform->st,
696 msg6,&transform_err)) {
697 /* There's a problem */
698 slog(st,LOG_SEC,"process_msg6: transform: %s",transform_err);
701 /* Buffer should now contain untransformed PING packet data */
703 if (buf_unprepend_uint32(msg6)!=LABEL_MSG6) {
704 slog(st,LOG_SEC,"MSG6/PONG packet contained invalid data");
707 /* Older versions of secnet used to write some config data here
708 * which we ignore. So we don't CHECK_EMPTY */
712 static bool_t decrypt_msg0(struct site *st, struct buffer_if *msg0)
714 cstring_t transform_err;
718 if (!unpick_msg0(st,msg0,&m)) return False;
720 problem = st->current_transform->reverse(st->current_transform->st,
721 msg0,&transform_err);
722 if (!problem) return True;
725 slog(st,LOG_DROP,"transform: %s (merely skew)",transform_err);
729 slog(st,LOG_SEC,"transform: %s",transform_err);
730 initiate_key_setup(st,"incoming message would not decrypt");
734 static bool_t process_msg0(struct site *st, struct buffer_if *msg0,
735 const struct comm_addr *src)
739 if (!decrypt_msg0(st,msg0))
743 type=buf_unprepend_uint32(msg0);
746 /* We must forget about the current session. */
747 delete_key(st,"request from peer",LOG_SEC);
750 /* Deliver to netlink layer */
751 st->netlink->deliver(st->netlink->st,msg0);
752 transport_data_msgok(st,src);
753 /* See whether we should start negotiating a new key */
754 if (st->now > st->renegotiate_key_time)
755 initiate_key_setup(st,"incoming packet in renegotiation window");
758 slog(st,LOG_SEC,"incoming encrypted message of type %08x "
765 static void dump_packet(struct site *st, struct buffer_if *buf,
766 const struct comm_addr *addr, bool_t incoming)
768 uint32_t dest=ntohl(*(uint32_t *)buf->start);
769 uint32_t source=ntohl(*(uint32_t *)(buf->start+4));
770 uint32_t msgtype=ntohl(*(uint32_t *)(buf->start+8));
772 if (st->log_events & LOG_DUMP)
773 slilog(st->log,M_DEBUG,"%s: %s: %08x<-%08x: %08x:",
774 st->tunname,incoming?"incoming":"outgoing",
775 dest,source,msgtype);
778 static uint32_t site_status(void *st)
783 static bool_t send_msg(struct site *st)
786 transport_xmit(st, &st->setup_peers, &st->buffer, True);
787 st->timeout=st->now+st->setup_retry_interval;
791 slog(st,LOG_SETUP_TIMEOUT,"timed out sending key setup packet "
792 "(in state %s)",state_name(st->state));
793 enter_state_wait(st);
798 static void site_resolve_callback(void *sst, struct in_addr *address)
801 struct comm_addr ca_buf, *ca_use;
803 if (st->state!=SITE_RESOLVE) {
804 slog(st,LOG_UNEXPECTED,"site_resolve_callback called unexpectedly");
809 ca_buf.comm=st->comms[0];
810 ca_buf.sin.sin_family=AF_INET;
811 ca_buf.sin.sin_port=htons(st->remoteport);
812 ca_buf.sin.sin_addr=*address;
815 slog(st,LOG_ERROR,"resolution of %s failed",st->address);
818 if (transport_compute_setupinit_peers(st,ca_use)) {
819 enter_new_state(st,SITE_SENTMSG1);
821 /* Can't figure out who to try to to talk to */
822 slog(st,LOG_SETUP_INIT,"key exchange failed: cannot find peer address");
827 static bool_t initiate_key_setup(struct site *st, cstring_t reason)
829 if (st->state!=SITE_RUN) return False;
830 slog(st,LOG_SETUP_INIT,"initiating key exchange (%s)",reason);
832 slog(st,LOG_SETUP_INIT,"resolving peer address");
833 return enter_state_resolve(st);
834 } else if (transport_compute_setupinit_peers(st,0)) {
835 return enter_new_state(st,SITE_SENTMSG1);
837 slog(st,LOG_SETUP_INIT,"key exchange failed: no address for peer");
841 static void activate_new_key(struct site *st)
843 struct transform_inst_if *t;
845 /* We have two transform instances, which we swap between active
847 t=st->current_transform;
848 st->current_transform=st->new_transform;
853 st->current_valid=True;
854 st->current_key_timeout=st->now+st->key_lifetime;
855 st->renegotiate_key_time=st->now+st->key_renegotiate_time;
856 transport_peers_copy(st,&st->peers,&st->setup_peers);
857 st->remote_session_id=st->setup_session_id;
859 slog(st,LOG_ACTIVATE_KEY,"new key activated");
863 static void delete_key(struct site *st, cstring_t reason, uint32_t loglevel)
865 if (st->current_valid) {
866 slog(st,loglevel,"session closed (%s)",reason);
868 st->current_valid=False;
869 st->current_transform->delkey(st->current_transform->st);
870 st->current_key_timeout=0;
871 set_link_quality(st);
875 static void state_assert(struct site *st, bool_t ok)
877 if (!ok) fatal("site:state_assert");
880 static void enter_state_stop(struct site *st)
884 delete_key(st,"entering state STOP",LOG_TIMEOUT_KEY);
885 st->new_transform->delkey(st->new_transform->st);
888 static void set_link_quality(struct site *st)
891 if (st->current_valid)
892 quality=LINK_QUALITY_UP;
893 else if (st->state==SITE_WAIT || st->state==SITE_STOP)
894 quality=LINK_QUALITY_DOWN;
895 else if (st->address)
896 quality=LINK_QUALITY_DOWN_CURRENT_ADDRESS;
897 else if (transport_peers_valid(&st->peers))
898 quality=LINK_QUALITY_DOWN_STALE_ADDRESS;
900 quality=LINK_QUALITY_DOWN;
902 st->netlink->set_quality(st->netlink->st,quality);
905 static void enter_state_run(struct site *st)
907 slog(st,LOG_STATE,"entering state RUN");
911 st->setup_session_id=0;
912 transport_peers_clear(st,&st->setup_peers);
913 memset(st->localN,0,NONCELEN);
914 memset(st->remoteN,0,NONCELEN);
915 st->new_transform->delkey(st->new_transform->st);
916 memset(st->dhsecret,0,st->dh->len);
917 memset(st->sharedsecret,0,st->transform->keylen);
918 set_link_quality(st);
921 static bool_t enter_state_resolve(struct site *st)
923 state_assert(st,st->state==SITE_RUN);
924 slog(st,LOG_STATE,"entering state RESOLVE");
925 st->state=SITE_RESOLVE;
926 st->resolver->request(st->resolver->st,st->address,
927 site_resolve_callback,st);
931 static bool_t enter_new_state(struct site *st, uint32_t next)
933 bool_t (*gen)(struct site *st);
936 slog(st,LOG_STATE,"entering state %s",state_name(next));
939 state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE);
943 state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE ||
944 st->state==SITE_SENTMSG1 || st->state==SITE_WAIT);
948 state_assert(st,st->state==SITE_SENTMSG1);
949 BUF_FREE(&st->buffer);
953 state_assert(st,st->state==SITE_SENTMSG2);
954 BUF_FREE(&st->buffer);
958 state_assert(st,st->state==SITE_SENTMSG3);
959 BUF_FREE(&st->buffer);
963 state_assert(st,st->state==SITE_SENTMSG4);
964 BUF_FREE(&st->buffer);
969 fatal("enter_new_state(%s): invalid new state",state_name(next));
973 if (hacky_par_start_failnow()) return False;
975 r= gen(st) && send_msg(st);
978 st->setup_retries, st->setup_retry_interval,
983 if (next==SITE_RUN) {
984 BUF_FREE(&st->buffer); /* Never reused */
985 st->timeout=0; /* Never retransmit */
986 activate_new_key(st);
990 slog(st,LOG_ERROR,"error entering state %s",state_name(next));
991 st->buffer.free=False; /* Unconditionally use the buffer; it may be
992 in either state, and enter_state_wait() will
994 enter_state_wait(st);
998 /* msg7 tells our peer that we're about to forget our key */
999 static bool_t send_msg7(struct site *st, cstring_t reason)
1001 cstring_t transform_err;
1003 if (st->current_valid && st->buffer.free
1004 && transport_peers_valid(&st->peers)) {
1005 BUF_ALLOC(&st->buffer,"site:MSG7");
1006 buffer_init(&st->buffer,st->transform->max_start_pad+(4*3));
1007 buf_append_uint32(&st->buffer,LABEL_MSG7);
1008 buf_append_string(&st->buffer,reason);
1009 st->current_transform->forwards(st->current_transform->st,
1010 &st->buffer, &transform_err);
1011 buf_prepend_uint32(&st->buffer,LABEL_MSG0);
1012 buf_prepend_uint32(&st->buffer,st->index);
1013 buf_prepend_uint32(&st->buffer,st->remote_session_id);
1014 transport_xmit(st,&st->peers,&st->buffer,True);
1015 BUF_FREE(&st->buffer);
1021 /* We go into this state if our peer becomes uncommunicative. Similar to
1022 the "stop" state, we forget all session keys for a while, before
1023 re-entering the "run" state. */
1024 static void enter_state_wait(struct site *st)
1026 slog(st,LOG_STATE,"entering state WAIT");
1027 st->timeout=st->now+st->wait_timeout;
1028 st->state=SITE_WAIT;
1029 set_link_quality(st);
1030 BUF_FREE(&st->buffer); /* will have had an outgoing packet in it */
1031 /* XXX Erase keys etc. */
1034 static inline void site_settimeout(uint64_t timeout, int *timeout_io)
1037 int64_t offset=timeout-*now;
1038 if (offset<0) offset=0;
1039 if (offset>INT_MAX) offset=INT_MAX;
1040 if (*timeout_io<0 || offset<*timeout_io)
1045 static int site_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
1048 struct site *st=sst;
1050 *nfds_io=0; /* We don't use any file descriptors */
1053 /* Work out when our next timeout is. The earlier of 'timeout' or
1054 'current_key_timeout'. A stored value of '0' indicates no timeout
1056 site_settimeout(st->timeout, timeout_io);
1057 site_settimeout(st->current_key_timeout, timeout_io);
1059 return 0; /* success */
1062 /* NB site_afterpoll will be called before site_beforepoll is ever called */
1063 static void site_afterpoll(void *sst, struct pollfd *fds, int nfds)
1065 struct site *st=sst;
1068 if (st->timeout && *now>st->timeout) {
1070 if (st->state>=SITE_SENTMSG1 && st->state<=SITE_SENTMSG5) {
1071 if (!hacky_par_start_failnow())
1073 } else if (st->state==SITE_WAIT) {
1074 enter_state_run(st);
1076 slog(st,LOG_ERROR,"site_afterpoll: unexpected timeout, state=%d",
1080 if (st->current_key_timeout && *now>st->current_key_timeout) {
1081 delete_key(st,"maximum key life exceeded",LOG_TIMEOUT_KEY);
1085 /* This function is called by the netlink device to deliver packets
1086 intended for the remote network. The packet is in "raw" wire
1087 format, but is guaranteed to be word-aligned. */
1088 static void site_outgoing(void *sst, struct buffer_if *buf)
1090 struct site *st=sst;
1091 cstring_t transform_err;
1093 if (st->state==SITE_STOP) {
1098 /* In all other states we consider delivering the packet if we have
1099 a valid key and a valid address to send it to. */
1100 if (st->current_valid && transport_peers_valid(&st->peers)) {
1101 /* Transform it and send it */
1103 buf_prepend_uint32(buf,LABEL_MSG9);
1104 st->current_transform->forwards(st->current_transform->st,
1105 buf, &transform_err);
1106 buf_prepend_uint32(buf,LABEL_MSG0);
1107 buf_prepend_uint32(buf,st->index);
1108 buf_prepend_uint32(buf,st->remote_session_id);
1109 transport_xmit(st,&st->peers,buf,False);
1115 slog(st,LOG_DROP,"discarding outgoing packet of size %d",buf->size);
1117 initiate_key_setup(st,"outgoing packet");
1120 /* This function is called by the communication device to deliver
1121 packets from our peers. */
1122 static bool_t site_incoming(void *sst, struct buffer_if *buf,
1123 const struct comm_addr *source)
1125 struct site *st=sst;
1127 if (buf->size < 12) return False;
1129 uint32_t dest=ntohl(*(uint32_t *)buf->start);
1132 /* It could be for any site - it should have LABEL_MSG1 and
1133 might have our name and our peer's name in it */
1134 if (buf->size<(st->setupsiglen+8+NONCELEN)) return False;
1135 if (memcmp(buf->start+8,st->setupsig,st->setupsiglen)==0) {
1136 /* It's addressed to us. Decide what to do about it. */
1137 dump_packet(st,buf,source,True);
1138 if (st->state==SITE_RUN || st->state==SITE_RESOLVE ||
1139 st->state==SITE_WAIT) {
1140 /* We should definitely process it */
1141 if (process_msg1(st,buf,source)) {
1142 slog(st,LOG_SETUP_INIT,"key setup initiated by peer");
1143 enter_new_state(st,SITE_SENTMSG2);
1145 slog(st,LOG_ERROR,"failed to process incoming msg1");
1149 } else if (st->state==SITE_SENTMSG1) {
1150 /* We've just sent a message 1! They may have crossed on
1151 the wire. If we have priority then we ignore the
1152 incoming one, otherwise we process it as usual. */
1153 if (st->setup_priority) {
1155 slog(st,LOG_DUMP,"crossed msg1s; we are higher "
1156 "priority => ignore incoming msg1");
1159 slog(st,LOG_DUMP,"crossed msg1s; we are lower "
1160 "priority => use incoming msg1");
1161 if (process_msg1(st,buf,source)) {
1162 BUF_FREE(&st->buffer); /* Free our old message 1 */
1163 enter_new_state(st,SITE_SENTMSG2);
1165 slog(st,LOG_ERROR,"failed to process an incoming "
1166 "crossed msg1 (we have low priority)");
1172 /* The message 1 was received at an unexpected stage of the
1173 key setup. XXX POLICY - what do we do? */
1174 slog(st,LOG_UNEXPECTED,"unexpected incoming message 1");
1178 return False; /* Not for us. */
1180 if (dest==st->index) {
1181 /* Explicitly addressed to us */
1182 uint32_t msgtype=ntohl(get_uint32(buf->start+8));
1183 if (msgtype!=LABEL_MSG0) dump_packet(st,buf,source,True);
1186 /* If the source is our current peer then initiate a key setup,
1187 because our peer's forgotten the key */
1188 if (get_uint32(buf->start+4)==st->remote_session_id) {
1189 initiate_key_setup(st,"received a NAK");
1191 slog(st,LOG_SEC,"bad incoming NAK");
1195 process_msg0(st,buf,source);
1198 /* Setup packet: should not have been explicitly addressed
1200 slog(st,LOG_SEC,"incoming explicitly addressed msg1");
1203 /* Setup packet: expected only in state SENTMSG1 */
1204 if (st->state!=SITE_SENTMSG1) {
1205 slog(st,LOG_UNEXPECTED,"unexpected MSG2");
1206 } else if (process_msg2(st,buf,source)) {
1207 transport_setup_msgok(st,source);
1208 enter_new_state(st,SITE_SENTMSG3);
1210 slog(st,LOG_SEC,"invalid MSG2");
1214 /* Setup packet: expected only in state SENTMSG2 */
1215 if (st->state!=SITE_SENTMSG2) {
1216 slog(st,LOG_UNEXPECTED,"unexpected MSG3");
1217 } else if (process_msg3(st,buf,source)) {
1218 transport_setup_msgok(st,source);
1219 enter_new_state(st,SITE_SENTMSG4);
1221 slog(st,LOG_SEC,"invalid MSG3");
1225 /* Setup packet: expected only in state SENTMSG3 */
1226 if (st->state!=SITE_SENTMSG3) {
1227 slog(st,LOG_UNEXPECTED,"unexpected MSG4");
1228 } else if (process_msg4(st,buf,source)) {
1229 transport_setup_msgok(st,source);
1230 enter_new_state(st,SITE_SENTMSG5);
1232 slog(st,LOG_SEC,"invalid MSG4");
1236 /* Setup packet: expected only in state SENTMSG4 */
1237 /* (may turn up in state RUN if our return MSG6 was lost
1238 and the new key has already been activated. In that
1239 case we should treat it as an ordinary PING packet. We
1240 can't pass it to process_msg5() because the
1241 new_transform will now be unkeyed. XXX) */
1242 if (st->state!=SITE_SENTMSG4) {
1243 slog(st,LOG_UNEXPECTED,"unexpected MSG5");
1244 } else if (process_msg5(st,buf,source)) {
1245 transport_setup_msgok(st,source);
1246 enter_new_state(st,SITE_RUN);
1248 slog(st,LOG_SEC,"invalid MSG5");
1252 /* Setup packet: expected only in state SENTMSG5 */
1253 if (st->state!=SITE_SENTMSG5) {
1254 slog(st,LOG_UNEXPECTED,"unexpected MSG6");
1255 } else if (process_msg6(st,buf,source)) {
1256 BUF_FREE(&st->buffer); /* Free message 5 */
1257 transport_setup_msgok(st,source);
1258 activate_new_key(st);
1260 slog(st,LOG_SEC,"invalid MSG6");
1264 slog(st,LOG_SEC,"received message of unknown type 0x%08x",
1275 static void site_control(void *vst, bool_t run)
1277 struct site *st=vst;
1278 if (run) enter_state_run(st);
1279 else enter_state_stop(st);
1282 static void site_phase_hook(void *sst, uint32_t newphase)
1284 struct site *st=sst;
1286 /* The program is shutting down; tell our peer */
1287 send_msg7(st,"shutting down");
1290 static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context,
1293 static uint32_t index_sequence;
1299 st=safe_malloc(sizeof(*st),"site_apply");
1301 st->cl.description="site";
1302 st->cl.type=CL_SITE;
1304 st->cl.interface=&st->ops;
1306 st->ops.control=site_control;
1307 st->ops.status=site_status;
1309 /* First parameter must be a dict */
1310 item=list_elem(args,0);
1311 if (!item || item->type!=t_dict)
1312 cfgfatal(loc,"site","parameter must be a dictionary\n");
1314 dict=item->data.dict;
1315 st->localname=dict_read_string(dict, "local-name", True, "site", loc);
1316 st->remotename=dict_read_string(dict, "name", True, "site", loc);
1318 st->peer_mobile=dict_read_bool(dict,"mobile",False,"site",loc,False);
1319 bool_t local_mobile=
1320 dict_read_bool(dict,"local-mobile",False,"site",loc,False);
1322 /* Sanity check (which also allows the 'sites' file to include
1323 site() closures for all sites including our own): refuse to
1324 talk to ourselves */
1325 if (strcmp(st->localname,st->remotename)==0) {
1326 Message(M_DEBUG,"site %s: local-name==name -> ignoring this site\n",
1328 if (st->peer_mobile != local_mobile)
1329 cfgfatal(loc,"site","site %s's peer-mobile=%d"
1330 " but our local-mobile=%d\n",
1331 st->localname, st->peer_mobile, local_mobile);
1335 if (st->peer_mobile && local_mobile) {
1336 Message(M_WARNING,"site %s: site is mobile but so are we"
1337 " -> ignoring this site\n", st->remotename);
1342 assert(index_sequence < 0xffffffffUL);
1343 st->index = ++index_sequence;
1344 st->netlink=find_cl_if(dict,"link",CL_NETLINK,True,"site",loc);
1346 list_t *comms_cfg=dict_lookup(dict,"comm");
1347 if (!comms_cfg) cfgfatal(loc,"site","closure list \"comm\" not found\n");
1348 st->ncomms=list_length(comms_cfg);
1349 st->comms=safe_malloc_ary(sizeof(*st->comms),st->ncomms,"comms");
1351 for (i=0; i<st->ncomms; i++) {
1352 item_t *item=list_elem(comms_cfg,i);
1353 if (item->type!=t_closure)
1354 cfgfatal(loc,"site","comm is not a closure\n");
1355 closure_t *cl=item->data.closure;
1356 if (cl->type!=CL_COMM) cfgfatal(loc,"site","comm closure wrong type\n");
1357 st->comms[i]=cl->interface;
1360 st->resolver=find_cl_if(dict,"resolver",CL_RESOLVER,True,"site",loc);
1361 st->log=find_cl_if(dict,"log",CL_LOG,True,"site",loc);
1362 st->random=find_cl_if(dict,"random",CL_RANDOMSRC,True,"site",loc);
1364 st->privkey=find_cl_if(dict,"local-key",CL_RSAPRIVKEY,True,"site",loc);
1365 st->address=dict_read_string(dict, "address", False, "site", loc);
1367 st->remoteport=dict_read_number(dict,"port",True,"site",loc,0);
1368 else st->remoteport=0;
1369 st->pubkey=find_cl_if(dict,"key",CL_RSAPUBKEY,True,"site",loc);
1372 find_cl_if(dict,"transform",CL_TRANSFORM,True,"site",loc);
1374 st->dh=find_cl_if(dict,"dh",CL_DH,True,"site",loc);
1375 st->hash=find_cl_if(dict,"hash",CL_HASH,True,"site",loc);
1377 #define DEFAULT(D) (st->peer_mobile || local_mobile \
1378 ? DEFAULT_MOBILE_##D : DEFAULT_##D)
1379 #define CFG_NUMBER(k,D) dict_read_number(dict,(k),False,"site",loc,DEFAULT(D));
1381 st->key_lifetime= CFG_NUMBER("key-lifetime", KEY_LIFETIME);
1382 st->setup_retries= CFG_NUMBER("setup-retries", SETUP_RETRIES);
1383 st->setup_retry_interval= CFG_NUMBER("setup-timeout", SETUP_RETRY_INTERVAL);
1384 st->wait_timeout= CFG_NUMBER("wait-time", WAIT_TIME);
1386 st->mobile_peer_expiry= dict_read_number(
1387 dict,"mobile-peer-expiry",False,"site",loc,DEFAULT_MOBILE_PEER_EXPIRY);
1389 st->transport_peers_max= !st->peer_mobile ? 1 : dict_read_number(
1390 dict,"mobile-peers-max",False,"site",loc,DEFAULT_MOBILE_PEERS_MAX);
1391 if (st->transport_peers_max<1 ||
1392 st->transport_peers_max>=MAX_MOBILE_PEERS_MAX) {
1393 cfgfatal(loc,"site","mobile-peers-max must be in range 1.."
1394 STRING(MAX_MOBILE_PEERS_MAX) "\n");
1397 if (st->key_lifetime < DEFAULT(KEY_RENEGOTIATE_GAP)*2)
1398 st->key_renegotiate_time=st->key_lifetime/2;
1400 st->key_renegotiate_time=st->key_lifetime-DEFAULT(KEY_RENEGOTIATE_GAP);
1401 st->key_renegotiate_time=dict_read_number(
1402 dict,"renegotiate-time",False,"site",loc,st->key_renegotiate_time);
1403 if (st->key_renegotiate_time > st->key_lifetime) {
1404 cfgfatal(loc,"site",
1405 "renegotiate-time must be less than key-lifetime\n");
1408 st->log_events=string_list_to_word(dict_lookup(dict,"log-events"),
1409 log_event_table,"site");
1411 st->tunname=safe_malloc(strlen(st->localname)+strlen(st->remotename)+5,
1413 sprintf(st->tunname,"%s<->%s",st->localname,st->remotename);
1415 /* The information we expect to see in incoming messages of type 1 */
1416 /* fixme: lots of unchecked overflows here, but the results are only
1417 corrupted packets rather than undefined behaviour */
1418 st->setupsiglen=strlen(st->remotename)+strlen(st->localname)+8;
1419 st->setupsig=safe_malloc(st->setupsiglen,"site_apply");
1420 put_uint32(st->setupsig+0,LABEL_MSG1);
1421 put_uint16(st->setupsig+4,strlen(st->remotename));
1422 memcpy(&st->setupsig[6],st->remotename,strlen(st->remotename));
1423 put_uint16(st->setupsig+(6+strlen(st->remotename)),strlen(st->localname));
1424 memcpy(&st->setupsig[8+strlen(st->remotename)],st->localname,
1425 strlen(st->localname));
1426 st->setup_priority=(strcmp(st->localname,st->remotename)>0);
1428 buffer_new(&st->buffer,SETUP_BUFFER_LEN);
1430 /* We are interested in poll(), but only for timeouts. We don't have
1431 any fds of our own. */
1432 register_for_poll(st, site_beforepoll, site_afterpoll, 0, "site");
1435 st->current_valid=False;
1436 st->current_key_timeout=0;
1437 transport_peers_clear(st,&st->peers);
1438 transport_peers_clear(st,&st->setup_peers);
1439 /* XXX mlock these */
1440 st->dhsecret=safe_malloc(st->dh->len,"site:dhsecret");
1441 st->sharedsecret=safe_malloc(st->transform->keylen,"site:sharedsecret");
1443 /* We need to compute some properties of our comms */
1444 #define COMPUTE_WORST(pad) \
1445 int worst_##pad=0; \
1446 for (i=0; i<st->ncomms; i++) { \
1447 int thispad=st->comms[i]->pad; \
1448 if (thispad > worst_##pad) \
1449 worst_##pad=thispad; \
1451 COMPUTE_WORST(min_start_pad)
1452 COMPUTE_WORST(min_end_pad)
1454 /* We need to register the remote networks with the netlink device */
1455 st->netlink->reg(st->netlink->st, site_outgoing, st,
1456 st->transform->max_start_pad+(4*4)+
1457 worst_min_start_pad,
1458 st->transform->max_end_pad+worst_min_end_pad);
1460 for (i=0; i<st->ncomms; i++)
1461 st->comms[i]->request_notify(st->comms[i]->st, st, site_incoming);
1463 st->current_transform=st->transform->create(st->transform->st);
1464 st->new_transform=st->transform->create(st->transform->st);
1466 enter_state_stop(st);
1468 add_hook(PHASE_SHUTDOWN,site_phase_hook,st);
1470 return new_closure(&st->cl);
1473 void site_module(dict_t *dict)
1475 add_closure(dict,"site",site_apply);
1479 /***** TRANSPORT PEERS definitions *****/
1481 static void transport_peers_debug(struct site *st, transport_peers *dst,
1482 const char *didwhat,
1483 int nargs, const struct comm_addr *args,
1488 if (!(st->log_events & LOG_PEER_ADDRS))
1489 return; /* an optimisation */
1491 slog(st, LOG_PEER_ADDRS, "peers (%s) %s nargs=%d => npeers=%d",
1492 (dst==&st->peers ? "data" :
1493 dst==&st->setup_peers ? "setup" : "UNKNOWN"),
1494 didwhat, nargs, dst->npeers);
1496 for (i=0, argp=(void*)args;
1498 i++, (argp+=stride?stride:sizeof(*args))) {
1499 const struct comm_addr *ca=(void*)argp;
1500 slog(st, LOG_PEER_ADDRS, " args: addrs[%d]=%s",
1501 i, ca->comm->addr_to_string(ca->comm->st,ca));
1503 for (i=0; i<dst->npeers; i++) {
1504 struct timeval diff;
1505 timersub(tv_now,&dst->peers[i].last,&diff);
1506 const struct comm_addr *ca=&dst->peers[i].addr;
1507 slog(st, LOG_PEER_ADDRS, " peers: addrs[%d]=%s T-%ld.%06ld",
1508 i, ca->comm->addr_to_string(ca->comm->st,ca),
1509 (unsigned long)diff.tv_sec, (unsigned long)diff.tv_usec);
1513 static int transport_peer_compar(const void *av, const void *bv) {
1514 const transport_peer *a=av;
1515 const transport_peer *b=bv;
1516 /* put most recent first in the array */
1517 if (timercmp(&a->last, &b->last, <)) return +1;
1518 if (timercmp(&a->last, &b->last, >)) return -11;
1522 static void transport_peers_expire(struct site *st, transport_peers *peers) {
1523 /* peers must be sorted first */
1524 int previous_peers=peers->npeers;
1525 struct timeval oldest;
1526 oldest.tv_sec = tv_now->tv_sec - st->mobile_peer_expiry;
1527 oldest.tv_usec = tv_now->tv_usec;
1528 while (peers->npeers>1 &&
1529 timercmp(&peers->peers[peers->npeers-1].last, &oldest, <))
1531 if (peers->npeers != previous_peers)
1532 transport_peers_debug(st,peers,"expire", 0,0,0);
1535 static void transport_record_peer(struct site *st, transport_peers *peers,
1536 const struct comm_addr *addr, const char *m) {
1537 int slot, changed=0;
1539 for (slot=0; slot<peers->npeers; slot++)
1540 if (!memcmp(&peers->peers[slot].addr, addr, sizeof(*addr)))
1544 if (peers->npeers==st->transport_peers_max)
1545 slot=st->transport_peers_max;
1547 slot=peers->npeers++;
1550 peers->peers[slot].addr=*addr;
1551 peers->peers[slot].last=*tv_now;
1553 if (peers->npeers>1)
1554 qsort(peers->peers, peers->npeers,
1555 sizeof(*peers->peers), transport_peer_compar);
1557 if (changed || peers->npeers!=1)
1558 transport_peers_debug(st,peers,m, 1,addr,0);
1559 transport_peers_expire(st, peers);
1562 static bool_t transport_compute_setupinit_peers(struct site *st,
1563 const struct comm_addr *configured_addr /* 0 if none or not found */) {
1565 if (!configured_addr && !transport_peers_valid(&st->peers))
1568 slog(st,LOG_SETUP_INIT,
1569 (!configured_addr ? "using only %d old peer address(es)"
1570 : "using configured address, and/or perhaps %d old peer address(es)"),
1573 /* Non-mobile peers havve st->peers.npeers==0 or ==1, since they
1574 * have transport_peers_max==1. The effect is that this code
1575 * always uses the configured address if supplied, or otherwise
1576 * the existing data peer if one exists; this is as desired. */
1578 transport_peers_copy(st,&st->setup_peers,&st->peers);
1580 if (configured_addr)
1581 transport_record_peer(st,&st->setup_peers,configured_addr,"setupinit");
1583 assert(transport_peers_valid(&st->setup_peers));
1587 static void transport_setup_msgok(struct site *st, const struct comm_addr *a) {
1588 if (st->peer_mobile)
1589 transport_record_peer(st,&st->setup_peers,a,"setupmsg");
1591 static void transport_data_msgok(struct site *st, const struct comm_addr *a) {
1592 if (st->peer_mobile)
1593 transport_record_peer(st,&st->peers,a,"datamsg");
1596 static int transport_peers_valid(transport_peers *peers) {
1597 return peers->npeers;
1599 static void transport_peers_clear(struct site *st, transport_peers *peers) {
1601 transport_peers_debug(st,peers,"clear",0,0,0);
1603 static void transport_peers_copy(struct site *st, transport_peers *dst,
1604 const transport_peers *src) {
1605 dst->npeers=src->npeers;
1606 memcpy(dst->peers, src->peers, sizeof(*dst->peers) * dst->npeers);
1607 transport_peers_debug(st,dst,"copy",
1608 src->npeers, &src->peers->addr, sizeof(*src->peers));
1611 void transport_xmit(struct site *st, transport_peers *peers,
1612 struct buffer_if *buf, bool_t candebug) {
1614 transport_peers_expire(st, peers);
1615 for (slot=0; slot<peers->npeers; slot++) {
1616 transport_peer *peer=&peers->peers[slot];
1618 dump_packet(st, buf, &peer->addr, False);
1619 peer->addr.comm->sendmsg(peer->addr.comm->st, buf, &peer->addr);
1623 /***** END of transport peers declarations *****/