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 void *remote_addr_config; /* created and used by comm */
227 struct netlink_if *netlink;
228 struct comm_if **comms;
231 struct random_if *random;
232 struct rsaprivkey_if *privkey;
233 struct rsapubkey_if *pubkey;
234 struct transform_if *transform;
236 struct hash_if *hash;
238 uint32_t index; /* Index of this site */
239 int32_t setup_retries; /* How many times to send setup packets */
240 int32_t setup_retry_interval; /* Initial timeout for setup packets */
241 int32_t wait_timeout; /* How long to wait if setup unsuccessful */
242 int32_t mobile_peer_expiry; /* How long to remember 2ary addresses */
243 int32_t key_lifetime; /* How long a key lasts once set up */
244 int32_t key_renegotiate_time; /* If we see traffic (or a keepalive)
245 after this time, initiate a new
248 uint8_t *setupsig; /* Expected signature of incoming MSG1 packets */
249 int32_t setupsiglen; /* Allows us to discard packets quickly if
250 they are not for us */
251 bool_t setup_priority; /* Do we have precedence if both sites emit
252 message 1 simultaneously? */
255 /* runtime information */
257 uint64_t now; /* Most recently seen time */
259 /* The currently established session */
260 uint32_t remote_session_id;
261 struct transform_inst_if *current_transform;
262 bool_t current_valid;
263 uint64_t current_key_timeout; /* End of life of current key */
264 uint64_t renegotiate_key_time; /* When we can negotiate a new key */
265 transport_peers peers; /* Current address(es) of peer for data traffic */
267 /* The current key setup protocol exchange. We can only be
268 involved in one of these at a time. There's a potential for
269 denial of service here (the attacker keeps sending a setup
270 packet; we keep trying to continue the exchange, and have to
271 timeout before we can listen for another setup packet); perhaps
272 we should keep a list of 'bad' sources for setup packets. */
273 uint32_t setup_session_id;
274 transport_peers setup_peers;
275 uint8_t localN[NONCELEN]; /* Nonces for key exchange */
276 uint8_t remoteN[NONCELEN];
277 struct buffer_if buffer; /* Current outgoing key exchange packet */
278 int32_t retries; /* Number of retries remaining */
279 uint64_t timeout; /* Timeout for current state */
281 uint8_t *sharedsecret;
282 struct transform_inst_if *new_transform; /* For key setup/verify */
285 static void slog(struct site *st, uint32_t event, cstring_t msg, ...)
293 if (event&st->log_events) {
295 case LOG_UNEXPECTED: class=M_INFO; break;
296 case LOG_SETUP_INIT: class=M_INFO; break;
297 case LOG_SETUP_TIMEOUT: class=M_NOTICE; break;
298 case LOG_ACTIVATE_KEY: class=M_INFO; break;
299 case LOG_TIMEOUT_KEY: class=M_INFO; break;
300 case LOG_SEC: class=M_SECURITY; break;
301 case LOG_STATE: class=M_DEBUG; break;
302 case LOG_DROP: class=M_DEBUG; break;
303 case LOG_DUMP: class=M_DEBUG; break;
304 case LOG_ERROR: class=M_ERR; break;
305 case LOG_PEER_ADDRS: class=M_DEBUG; break;
306 default: class=M_ERR; break;
309 vsnprintf(buf,sizeof(buf),msg,ap);
310 st->log->log(st->log->st,class,"%s: %s",st->tunname,buf);
315 static void set_link_quality(struct site *st);
316 static void delete_key(struct site *st, cstring_t reason, uint32_t loglevel);
317 static bool_t initiate_key_setup(struct site *st, cstring_t reason);
318 static void enter_state_run(struct site *st);
319 static bool_t enter_state_resolve(struct site *st);
320 static bool_t enter_new_state(struct site *st,uint32_t next);
321 static void enter_state_wait(struct site *st);
323 #define CHECK_AVAIL(b,l) do { if ((b)->size<(l)) return False; } while(0)
324 #define CHECK_EMPTY(b) do { if ((b)->size!=0) return False; } while(0)
325 #define CHECK_TYPE(b,t) do { uint32_t type; \
326 CHECK_AVAIL((b),4); \
327 type=buf_unprepend_uint32((b)); \
328 if (type!=(t)) return False; } while(0)
347 /* Build any of msg1 to msg4. msg5 and msg6 are built from the inside
348 out using a transform of config data supplied by netlink */
349 static bool_t generate_msg(struct site *st, uint32_t type, cstring_t what)
355 st->retries=st->setup_retries;
356 BUF_ALLOC(&st->buffer,what);
357 buffer_init(&st->buffer,0);
358 buf_append_uint32(&st->buffer,
359 (type==LABEL_MSG1?0:st->setup_session_id));
360 buf_append_uint32(&st->buffer,st->index);
361 buf_append_uint32(&st->buffer,type);
362 buf_append_string(&st->buffer,st->localname);
363 buf_append_string(&st->buffer,st->remotename);
364 memcpy(buf_append(&st->buffer,NONCELEN),st->localN,NONCELEN);
365 if (type==LABEL_MSG1) return True;
366 memcpy(buf_append(&st->buffer,NONCELEN),st->remoteN,NONCELEN);
367 if (type==LABEL_MSG2) return True;
369 if (hacky_par_mid_failnow()) return False;
371 dhpub=st->dh->makepublic(st->dh->st,st->dhsecret,st->dh->len);
372 buf_append_string(&st->buffer,dhpub);
374 hash=safe_malloc(st->hash->len, "generate_msg");
375 hst=st->hash->init();
376 st->hash->update(hst,st->buffer.start,st->buffer.size);
377 st->hash->final(hst,hash);
378 sig=st->privkey->sign(st->privkey->st,hash,st->hash->len);
379 buf_append_string(&st->buffer,sig);
385 static bool_t unpick_msg(struct site *st, uint32_t type,
386 struct buffer_if *msg, struct msg *m)
388 m->hashstart=msg->start;
390 m->dest=buf_unprepend_uint32(msg);
392 m->source=buf_unprepend_uint32(msg);
393 CHECK_TYPE(msg,type);
395 m->remlen=buf_unprepend_uint16(msg);
396 CHECK_AVAIL(msg,m->remlen);
397 m->remote=buf_unprepend(msg,m->remlen);
399 m->loclen=buf_unprepend_uint16(msg);
400 CHECK_AVAIL(msg,m->loclen);
401 m->local=buf_unprepend(msg,m->loclen);
402 CHECK_AVAIL(msg,NONCELEN);
403 m->nR=buf_unprepend(msg,NONCELEN);
404 if (type==LABEL_MSG1) {
408 CHECK_AVAIL(msg,NONCELEN);
409 m->nL=buf_unprepend(msg,NONCELEN);
410 if (type==LABEL_MSG2) {
415 m->pklen=buf_unprepend_uint16(msg);
416 CHECK_AVAIL(msg,m->pklen);
417 m->pk=buf_unprepend(msg,m->pklen);
418 m->hashlen=msg->start-m->hashstart;
420 m->siglen=buf_unprepend_uint16(msg);
421 CHECK_AVAIL(msg,m->siglen);
422 m->sig=buf_unprepend(msg,m->siglen);
427 static bool_t check_msg(struct site *st, uint32_t type, struct msg *m,
430 if (type==LABEL_MSG1) return True;
432 /* Check that the site names and our nonce have been sent
433 back correctly, and then store our peer's nonce. */
434 if (memcmp(m->remote,st->remotename,strlen(st->remotename)!=0)) {
435 *error="wrong remote site name";
438 if (memcmp(m->local,st->localname,strlen(st->localname)!=0)) {
439 *error="wrong local site name";
442 if (memcmp(m->nL,st->localN,NONCELEN)!=0) {
443 *error="wrong locally-generated nonce";
446 if (type==LABEL_MSG2) return True;
447 if (memcmp(m->nR,st->remoteN,NONCELEN)!=0) {
448 *error="wrong remotely-generated nonce";
451 if (type==LABEL_MSG3) return True;
452 if (type==LABEL_MSG4) return True;
453 *error="unknown message type";
457 static bool_t generate_msg1(struct site *st)
459 st->random->generate(st->random->st,NONCELEN,st->localN);
460 return generate_msg(st,LABEL_MSG1,"site:MSG1");
463 static bool_t process_msg1(struct site *st, struct buffer_if *msg1,
464 const struct comm_addr *src)
468 /* We've already determined we're in an appropriate state to
469 process an incoming MSG1, and that the MSG1 has correct values
472 if (!unpick_msg(st,LABEL_MSG1,msg1,&m)) return False;
474 transport_record_peer(st,&st->setup_peers,src,"msg1");
475 st->setup_session_id=m.source;
476 memcpy(st->remoteN,m.nR,NONCELEN);
480 static bool_t generate_msg2(struct site *st)
482 st->random->generate(st->random->st,NONCELEN,st->localN);
483 return generate_msg(st,LABEL_MSG2,"site:MSG2");
486 static bool_t process_msg2(struct site *st, struct buffer_if *msg2,
487 const struct comm_addr *src)
492 if (!unpick_msg(st,LABEL_MSG2,msg2,&m)) return False;
493 if (!check_msg(st,LABEL_MSG2,&m,&err)) {
494 slog(st,LOG_SEC,"msg2: %s",err);
497 st->setup_session_id=m.source;
498 memcpy(st->remoteN,m.nR,NONCELEN);
502 static bool_t generate_msg3(struct site *st)
504 /* Now we have our nonce and their nonce. Think of a secret key,
505 and create message number 3. */
506 st->random->generate(st->random->st,st->dh->len,st->dhsecret);
507 return generate_msg(st,LABEL_MSG3,"site:MSG3");
510 static bool_t process_msg3(struct site *st, struct buffer_if *msg3,
511 const struct comm_addr *src)
518 if (!unpick_msg(st,LABEL_MSG3,msg3,&m)) return False;
519 if (!check_msg(st,LABEL_MSG3,&m,&err)) {
520 slog(st,LOG_SEC,"msg3: %s",err);
524 /* Check signature and store g^x mod m */
525 hash=safe_malloc(st->hash->len, "process_msg3");
526 hst=st->hash->init();
527 st->hash->update(hst,m.hashstart,m.hashlen);
528 st->hash->final(hst,hash);
529 /* Terminate signature with a '0' - cheating, but should be ok */
531 if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) {
532 slog(st,LOG_SEC,"msg3 signature failed check!");
538 /* Terminate their DH public key with a '0' */
540 /* Invent our DH secret key */
541 st->random->generate(st->random->st,st->dh->len,st->dhsecret);
543 /* Generate the shared key */
544 st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk,
545 st->sharedsecret,st->transform->keylen);
547 /* Set up the transform */
548 st->new_transform->setkey(st->new_transform->st,st->sharedsecret,
549 st->transform->keylen);
554 static bool_t generate_msg4(struct site *st)
556 /* We have both nonces, their public key and our private key. Generate
557 our public key, sign it and send it to them. */
558 return generate_msg(st,LABEL_MSG4,"site:MSG4");
561 static bool_t process_msg4(struct site *st, struct buffer_if *msg4,
562 const struct comm_addr *src)
569 if (!unpick_msg(st,LABEL_MSG4,msg4,&m)) return False;
570 if (!check_msg(st,LABEL_MSG4,&m,&err)) {
571 slog(st,LOG_SEC,"msg4: %s",err);
575 /* Check signature and store g^x mod m */
576 hash=safe_malloc(st->hash->len, "process_msg4");
577 hst=st->hash->init();
578 st->hash->update(hst,m.hashstart,m.hashlen);
579 st->hash->final(hst,hash);
580 /* Terminate signature with a '0' - cheating, but should be ok */
582 if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) {
583 slog(st,LOG_SEC,"msg4 signature failed check!");
589 /* Terminate their DH public key with a '0' */
591 /* Generate the shared key */
592 st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk,
593 st->sharedsecret,st->transform->keylen);
594 /* Set up the transform */
595 st->new_transform->setkey(st->new_transform->st,st->sharedsecret,
596 st->transform->keylen);
607 static bool_t unpick_msg0(struct site *st, struct buffer_if *msg0,
611 m->dest=buf_unprepend_uint32(msg0);
613 m->source=buf_unprepend_uint32(msg0);
615 m->type=buf_unprepend_uint32(msg0);
617 /* Leaves transformed part of buffer untouched */
620 static bool_t generate_msg5(struct site *st)
622 cstring_t transform_err;
624 BUF_ALLOC(&st->buffer,"site:MSG5");
625 /* We are going to add four words to the message */
626 buffer_init(&st->buffer,st->transform->max_start_pad+(4*4));
627 /* Give the netlink code an opportunity to put its own stuff in the
628 message (configuration information, etc.) */
629 st->netlink->output_config(st->netlink->st,&st->buffer);
630 buf_prepend_uint32(&st->buffer,LABEL_MSG5);
631 st->new_transform->forwards(st->new_transform->st,&st->buffer,
633 buf_prepend_uint32(&st->buffer,LABEL_MSG5);
634 buf_prepend_uint32(&st->buffer,st->index);
635 buf_prepend_uint32(&st->buffer,st->setup_session_id);
637 st->retries=st->setup_retries;
641 static bool_t process_msg5(struct site *st, struct buffer_if *msg5,
642 const struct comm_addr *src)
645 cstring_t transform_err;
647 if (!unpick_msg0(st,msg5,&m)) return False;
649 if (st->new_transform->reverse(st->new_transform->st,
650 msg5,&transform_err)) {
651 /* There's a problem */
652 slog(st,LOG_SEC,"process_msg5: transform: %s",transform_err);
655 /* Buffer should now contain untransformed PING packet data */
657 if (buf_unprepend_uint32(msg5)!=LABEL_MSG5) {
658 slog(st,LOG_SEC,"MSG5/PING packet contained wrong label");
661 if (!st->netlink->check_config(st->netlink->st,msg5)) {
662 slog(st,LOG_SEC,"MSG5/PING packet contained bad netlink config");
669 static bool_t generate_msg6(struct site *st)
671 cstring_t transform_err;
673 BUF_ALLOC(&st->buffer,"site:MSG6");
674 /* We are going to add four words to the message */
675 buffer_init(&st->buffer,st->transform->max_start_pad+(4*4));
676 /* Give the netlink code an opportunity to put its own stuff in the
677 message (configuration information, etc.) */
678 st->netlink->output_config(st->netlink->st,&st->buffer);
679 buf_prepend_uint32(&st->buffer,LABEL_MSG6);
680 st->new_transform->forwards(st->new_transform->st,&st->buffer,
682 buf_prepend_uint32(&st->buffer,LABEL_MSG6);
683 buf_prepend_uint32(&st->buffer,st->index);
684 buf_prepend_uint32(&st->buffer,st->setup_session_id);
686 st->retries=1; /* Peer will retransmit MSG5 if this packet gets lost */
690 static bool_t process_msg6(struct site *st, struct buffer_if *msg6,
691 const struct comm_addr *src)
694 cstring_t transform_err;
696 if (!unpick_msg0(st,msg6,&m)) return False;
698 if (st->new_transform->reverse(st->new_transform->st,
699 msg6,&transform_err)) {
700 /* There's a problem */
701 slog(st,LOG_SEC,"process_msg6: transform: %s",transform_err);
704 /* Buffer should now contain untransformed PING packet data */
706 if (buf_unprepend_uint32(msg6)!=LABEL_MSG6) {
707 slog(st,LOG_SEC,"MSG6/PONG packet contained invalid data");
710 if (!st->netlink->check_config(st->netlink->st,msg6)) {
711 slog(st,LOG_SEC,"MSG6/PONG packet contained bad netlink config");
718 static bool_t process_msg0(struct site *st, struct buffer_if *msg0,
719 const struct comm_addr *src)
722 cstring_t transform_err;
725 if (!st->current_valid) {
726 slog(st,LOG_DROP,"incoming message but no current key -> dropping");
727 return initiate_key_setup(st,"incoming message but no current key");
730 if (!unpick_msg0(st,msg0,&m)) return False;
732 if (st->current_transform->reverse(st->current_transform->st,
733 msg0,&transform_err)) {
734 /* There's a problem */
735 slog(st,LOG_SEC,"transform: %s",transform_err);
736 return initiate_key_setup(st,"incoming message would not decrypt");
739 type=buf_unprepend_uint32(msg0);
742 /* We must forget about the current session. */
743 delete_key(st,"request from peer",LOG_SEC);
746 /* Deliver to netlink layer */
747 st->netlink->deliver(st->netlink->st,msg0);
748 transport_data_msgok(st,src);
749 /* See whether we should start negotiating a new key */
750 if (st->now > st->renegotiate_key_time)
751 initiate_key_setup(st,"incoming packet in renegotiation window");
754 slog(st,LOG_SEC,"incoming encrypted message of type %08x "
761 static void dump_packet(struct site *st, struct buffer_if *buf,
762 const struct comm_addr *addr, bool_t incoming)
764 uint32_t dest=ntohl(*(uint32_t *)buf->start);
765 uint32_t source=ntohl(*(uint32_t *)(buf->start+4));
766 uint32_t msgtype=ntohl(*(uint32_t *)(buf->start+8));
768 if (st->log_events & LOG_DUMP)
769 slilog(st->log,M_DEBUG,"%s: %s: %08x<-%08x: %08x:",
770 st->tunname,incoming?"incoming":"outgoing",
771 dest,source,msgtype);
774 static uint32_t site_status(void *st)
779 static bool_t send_msg(struct site *st)
782 transport_xmit(st, &st->setup_peers, &st->buffer, True);
783 st->timeout=st->now+st->setup_retry_interval;
787 slog(st,LOG_SETUP_TIMEOUT,"timed out sending key setup packet "
788 "(in state %s)",state_name(st->state));
789 enter_state_wait(st);
794 static void site_resolve_callback(void *sst, const struct comm_addr *address)
798 if (st->state!=SITE_RESOLVE) {
799 slog(st,LOG_UNEXPECTED,"site_resolve_callback called unexpectedly");
803 slog(st,LOG_ERROR,"resolution of peer address failed");
805 if (transport_compute_setupinit_peers(st,address)) {
806 enter_new_state(st,SITE_SENTMSG1);
808 /* Can't figure out who to try to to talk to */
809 slog(st,LOG_SETUP_INIT,"key exchange failed: cannot find peer address");
814 static bool_t initiate_key_setup(struct site *st, cstring_t reason)
816 if (st->state!=SITE_RUN) return False;
817 slog(st,LOG_SETUP_INIT,"initiating key exchange (%s)",reason);
818 if (st->remote_addr_config) {
819 slog(st,LOG_SETUP_INIT,"resolving peer address");
820 return enter_state_resolve(st);
821 } else if (transport_compute_setupinit_peers(st,0)) {
822 return enter_new_state(st,SITE_SENTMSG1);
824 slog(st,LOG_SETUP_INIT,"key exchange failed: no address for peer");
828 static void activate_new_key(struct site *st)
830 struct transform_inst_if *t;
832 /* We have two transform instances, which we swap between active
834 t=st->current_transform;
835 st->current_transform=st->new_transform;
840 st->current_valid=True;
841 st->current_key_timeout=st->now+st->key_lifetime;
842 st->renegotiate_key_time=st->now+st->key_renegotiate_time;
843 transport_peers_copy(st,&st->peers,&st->setup_peers);
844 st->remote_session_id=st->setup_session_id;
846 slog(st,LOG_ACTIVATE_KEY,"new key activated");
850 static void delete_key(struct site *st, cstring_t reason, uint32_t loglevel)
852 if (st->current_valid) {
853 slog(st,loglevel,"session closed (%s)",reason);
855 st->current_valid=False;
856 st->current_transform->delkey(st->current_transform->st);
857 st->current_key_timeout=0;
858 set_link_quality(st);
862 static void state_assert(struct site *st, bool_t ok)
864 if (!ok) fatal("site:state_assert");
867 static void enter_state_stop(struct site *st)
871 delete_key(st,"entering state STOP",LOG_TIMEOUT_KEY);
872 st->new_transform->delkey(st->new_transform->st);
875 static void set_link_quality(struct site *st)
878 if (st->current_valid)
879 quality=LINK_QUALITY_UP;
880 else if (st->state==SITE_WAIT || st->state==SITE_STOP)
881 quality=LINK_QUALITY_DOWN;
882 else if (st->remote_addr_config)
883 quality=LINK_QUALITY_DOWN_CURRENT_ADDRESS;
884 else if (transport_peers_valid(&st->peers))
885 quality=LINK_QUALITY_DOWN_STALE_ADDRESS;
887 quality=LINK_QUALITY_DOWN;
889 st->netlink->set_quality(st->netlink->st,quality);
892 static void enter_state_run(struct site *st)
894 slog(st,LOG_STATE,"entering state RUN");
898 st->setup_session_id=0;
899 transport_peers_clear(st,&st->setup_peers);
900 memset(st->localN,0,NONCELEN);
901 memset(st->remoteN,0,NONCELEN);
902 st->new_transform->delkey(st->new_transform->st);
903 memset(st->dhsecret,0,st->dh->len);
904 memset(st->sharedsecret,0,st->transform->keylen);
905 set_link_quality(st);
908 static bool_t enter_state_resolve(struct site *st)
910 state_assert(st,st->state==SITE_RUN);
911 slog(st,LOG_STATE,"entering state RESOLVE");
912 st->state=SITE_RESOLVE;
913 st->comms[0]->peer_addr_request(st->comms[0]->st,st->remote_addr_config,
914 site_resolve_callback,st);
918 static bool_t enter_new_state(struct site *st, uint32_t next)
920 bool_t (*gen)(struct site *st);
923 slog(st,LOG_STATE,"entering state %s",state_name(next));
926 state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE);
930 state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE ||
931 st->state==SITE_SENTMSG1 || st->state==SITE_WAIT);
935 state_assert(st,st->state==SITE_SENTMSG1);
936 BUF_FREE(&st->buffer);
940 state_assert(st,st->state==SITE_SENTMSG2);
941 BUF_FREE(&st->buffer);
945 state_assert(st,st->state==SITE_SENTMSG3);
946 BUF_FREE(&st->buffer);
950 state_assert(st,st->state==SITE_SENTMSG4);
951 BUF_FREE(&st->buffer);
956 fatal("enter_new_state(%s): invalid new state",state_name(next));
960 if (hacky_par_start_failnow()) return False;
962 r= gen(st) && send_msg(st);
965 st->setup_retries, st->setup_retry_interval,
970 if (next==SITE_RUN) {
971 BUF_FREE(&st->buffer); /* Never reused */
972 st->timeout=0; /* Never retransmit */
973 activate_new_key(st);
977 slog(st,LOG_ERROR,"error entering state %s",state_name(next));
978 st->buffer.free=False; /* Unconditionally use the buffer; it may be
979 in either state, and enter_state_wait() will
981 enter_state_wait(st);
985 /* msg7 tells our peer that we're about to forget our key */
986 static bool_t send_msg7(struct site *st, cstring_t reason)
988 cstring_t transform_err;
990 if (st->current_valid && st->buffer.free
991 && transport_peers_valid(&st->peers)) {
992 BUF_ALLOC(&st->buffer,"site:MSG7");
993 buffer_init(&st->buffer,st->transform->max_start_pad+(4*3));
994 buf_append_uint32(&st->buffer,LABEL_MSG7);
995 buf_append_string(&st->buffer,reason);
996 st->current_transform->forwards(st->current_transform->st,
997 &st->buffer, &transform_err);
998 buf_prepend_uint32(&st->buffer,LABEL_MSG0);
999 buf_prepend_uint32(&st->buffer,st->index);
1000 buf_prepend_uint32(&st->buffer,st->remote_session_id);
1001 transport_xmit(st,&st->peers,&st->buffer,True);
1002 BUF_FREE(&st->buffer);
1008 /* We go into this state if our peer becomes uncommunicative. Similar to
1009 the "stop" state, we forget all session keys for a while, before
1010 re-entering the "run" state. */
1011 static void enter_state_wait(struct site *st)
1013 slog(st,LOG_STATE,"entering state WAIT");
1014 st->timeout=st->now+st->wait_timeout;
1015 st->state=SITE_WAIT;
1016 set_link_quality(st);
1017 BUF_FREE(&st->buffer); /* will have had an outgoing packet in it */
1018 /* XXX Erase keys etc. */
1021 static inline void site_settimeout(uint64_t timeout, int *timeout_io)
1024 int64_t offset=timeout-*now;
1025 if (offset<0) offset=0;
1026 if (offset>INT_MAX) offset=INT_MAX;
1027 if (*timeout_io<0 || offset<*timeout_io)
1032 static int site_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
1035 struct site *st=sst;
1037 *nfds_io=0; /* We don't use any file descriptors */
1040 /* Work out when our next timeout is. The earlier of 'timeout' or
1041 'current_key_timeout'. A stored value of '0' indicates no timeout
1043 site_settimeout(st->timeout, timeout_io);
1044 site_settimeout(st->current_key_timeout, timeout_io);
1046 return 0; /* success */
1049 /* NB site_afterpoll will be called before site_beforepoll is ever called */
1050 static void site_afterpoll(void *sst, struct pollfd *fds, int nfds)
1052 struct site *st=sst;
1055 if (st->timeout && *now>st->timeout) {
1057 if (st->state>=SITE_SENTMSG1 && st->state<=SITE_SENTMSG5) {
1058 if (!hacky_par_start_failnow())
1060 } else if (st->state==SITE_WAIT) {
1061 enter_state_run(st);
1063 slog(st,LOG_ERROR,"site_afterpoll: unexpected timeout, state=%d",
1067 if (st->current_key_timeout && *now>st->current_key_timeout) {
1068 delete_key(st,"maximum key life exceeded",LOG_TIMEOUT_KEY);
1072 /* This function is called by the netlink device to deliver packets
1073 intended for the remote network. The packet is in "raw" wire
1074 format, but is guaranteed to be word-aligned. */
1075 static void site_outgoing(void *sst, struct buffer_if *buf)
1077 struct site *st=sst;
1078 cstring_t transform_err;
1080 if (st->state==SITE_STOP) {
1085 /* In all other states we consider delivering the packet if we have
1086 a valid key and a valid address to send it to. */
1087 if (st->current_valid && transport_peers_valid(&st->peers)) {
1088 /* Transform it and send it */
1090 buf_prepend_uint32(buf,LABEL_MSG9);
1091 st->current_transform->forwards(st->current_transform->st,
1092 buf, &transform_err);
1093 buf_prepend_uint32(buf,LABEL_MSG0);
1094 buf_prepend_uint32(buf,st->index);
1095 buf_prepend_uint32(buf,st->remote_session_id);
1096 transport_xmit(st,&st->peers,buf,False);
1102 slog(st,LOG_DROP,"discarding outgoing packet of size %d",buf->size);
1104 initiate_key_setup(st,"outgoing packet");
1107 /* This function is called by the communication device to deliver
1108 packets from our peers. */
1109 static bool_t site_incoming(void *sst, struct buffer_if *buf,
1110 const struct comm_addr *source)
1112 struct site *st=sst;
1113 uint32_t dest=ntohl(*(uint32_t *)buf->start);
1116 /* It could be for any site - it should have LABEL_MSG1 and
1117 might have our name and our peer's name in it */
1118 if (buf->size<(st->setupsiglen+8+NONCELEN)) return False;
1119 if (memcmp(buf->start+8,st->setupsig,st->setupsiglen)==0) {
1120 /* It's addressed to us. Decide what to do about it. */
1121 dump_packet(st,buf,source,True);
1122 if (st->state==SITE_RUN || st->state==SITE_RESOLVE ||
1123 st->state==SITE_WAIT) {
1124 /* We should definitely process it */
1125 if (process_msg1(st,buf,source)) {
1126 slog(st,LOG_SETUP_INIT,"key setup initiated by peer");
1127 enter_new_state(st,SITE_SENTMSG2);
1129 slog(st,LOG_ERROR,"failed to process incoming msg1");
1133 } else if (st->state==SITE_SENTMSG1) {
1134 /* We've just sent a message 1! They may have crossed on
1135 the wire. If we have priority then we ignore the
1136 incoming one, otherwise we process it as usual. */
1137 if (st->setup_priority) {
1139 slog(st,LOG_DUMP,"crossed msg1s; we are higher "
1140 "priority => ignore incoming msg1");
1143 slog(st,LOG_DUMP,"crossed msg1s; we are lower "
1144 "priority => use incoming msg1");
1145 if (process_msg1(st,buf,source)) {
1146 BUF_FREE(&st->buffer); /* Free our old message 1 */
1147 enter_new_state(st,SITE_SENTMSG2);
1149 slog(st,LOG_ERROR,"failed to process an incoming "
1150 "crossed msg1 (we have low priority)");
1156 /* The message 1 was received at an unexpected stage of the
1157 key setup. XXX POLICY - what do we do? */
1158 slog(st,LOG_UNEXPECTED,"unexpected incoming message 1");
1162 return False; /* Not for us. */
1164 if (dest==st->index) {
1165 /* Explicitly addressed to us */
1166 uint32_t msgtype=ntohl(get_uint32(buf->start+8));
1167 if (msgtype!=LABEL_MSG0) dump_packet(st,buf,source,True);
1170 /* If the source is our current peer then initiate a key setup,
1171 because our peer's forgotten the key */
1172 if (get_uint32(buf->start+4)==st->remote_session_id) {
1173 initiate_key_setup(st,"received a NAK");
1175 slog(st,LOG_SEC,"bad incoming NAK");
1179 process_msg0(st,buf,source);
1182 /* Setup packet: should not have been explicitly addressed
1184 slog(st,LOG_SEC,"incoming explicitly addressed msg1");
1187 /* Setup packet: expected only in state SENTMSG1 */
1188 if (st->state!=SITE_SENTMSG1) {
1189 slog(st,LOG_UNEXPECTED,"unexpected MSG2");
1190 } else if (process_msg2(st,buf,source)) {
1191 transport_setup_msgok(st,source);
1192 enter_new_state(st,SITE_SENTMSG3);
1194 slog(st,LOG_SEC,"invalid MSG2");
1198 /* Setup packet: expected only in state SENTMSG2 */
1199 if (st->state!=SITE_SENTMSG2) {
1200 slog(st,LOG_UNEXPECTED,"unexpected MSG3");
1201 } else if (process_msg3(st,buf,source)) {
1202 transport_setup_msgok(st,source);
1203 enter_new_state(st,SITE_SENTMSG4);
1205 slog(st,LOG_SEC,"invalid MSG3");
1209 /* Setup packet: expected only in state SENTMSG3 */
1210 if (st->state!=SITE_SENTMSG3) {
1211 slog(st,LOG_UNEXPECTED,"unexpected MSG4");
1212 } else if (process_msg4(st,buf,source)) {
1213 transport_setup_msgok(st,source);
1214 enter_new_state(st,SITE_SENTMSG5);
1216 slog(st,LOG_SEC,"invalid MSG4");
1220 /* Setup packet: expected only in state SENTMSG4 */
1221 /* (may turn up in state RUN if our return MSG6 was lost
1222 and the new key has already been activated. In that
1223 case we should treat it as an ordinary PING packet. We
1224 can't pass it to process_msg5() because the
1225 new_transform will now be unkeyed. XXX) */
1226 if (st->state!=SITE_SENTMSG4) {
1227 slog(st,LOG_UNEXPECTED,"unexpected MSG5");
1228 } else if (process_msg5(st,buf,source)) {
1229 transport_setup_msgok(st,source);
1230 enter_new_state(st,SITE_RUN);
1232 slog(st,LOG_SEC,"invalid MSG5");
1236 /* Setup packet: expected only in state SENTMSG5 */
1237 if (st->state!=SITE_SENTMSG5) {
1238 slog(st,LOG_UNEXPECTED,"unexpected MSG6");
1239 } else if (process_msg6(st,buf,source)) {
1240 BUF_FREE(&st->buffer); /* Free message 5 */
1241 transport_setup_msgok(st,source);
1242 activate_new_key(st);
1244 slog(st,LOG_SEC,"invalid MSG6");
1248 slog(st,LOG_SEC,"received message of unknown type 0x%08x",
1259 static void site_control(void *vst, bool_t run)
1261 struct site *st=vst;
1262 if (run) enter_state_run(st);
1263 else enter_state_stop(st);
1266 static void site_phase_hook(void *sst, uint32_t newphase)
1268 struct site *st=sst;
1270 /* The program is shutting down; tell our peer */
1271 send_msg7(st,"shutting down");
1274 static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context,
1277 static uint32_t index_sequence;
1283 st=safe_malloc(sizeof(*st),"site_apply");
1285 st->cl.description="site";
1286 st->cl.type=CL_SITE;
1288 st->cl.interface=&st->ops;
1290 st->ops.control=site_control;
1291 st->ops.status=site_status;
1293 /* First parameter must be a dict */
1294 item=list_elem(args,0);
1295 if (!item || item->type!=t_dict)
1296 cfgfatal(loc,"site","parameter must be a dictionary\n");
1298 dict=item->data.dict;
1299 st->localname=dict_read_string(dict, "local-name", True, "site", loc);
1300 st->remotename=dict_read_string(dict, "name", True, "site", loc);
1302 st->peer_mobile=dict_read_bool(dict,"mobile",False,"site",loc,False);
1303 bool_t local_mobile=
1304 dict_read_bool(dict,"local-mobile",False,"site",loc,False);
1306 /* Sanity check (which also allows the 'sites' file to include
1307 site() closures for all sites including our own): refuse to
1308 talk to ourselves */
1309 if (strcmp(st->localname,st->remotename)==0) {
1310 Message(M_DEBUG,"site %s: local-name==name -> ignoring this site\n",
1312 if (st->peer_mobile != local_mobile)
1313 cfgfatal(loc,"site","site %s's peer-mobile=%d"
1314 " but our local-mobile=%d\n",
1315 st->localname, st->peer_mobile, local_mobile);
1319 if (st->peer_mobile && local_mobile) {
1320 Message(M_WARNING,"site %s: site is mobile but so are we"
1321 " -> ignoring this site\n", st->remotename);
1326 assert(index_sequence < 0xffffffffUL);
1327 st->index = ++index_sequence;
1328 st->netlink=find_cl_if(dict,"link",CL_NETLINK,True,"site",loc);
1330 list_t *comms_cfg=dict_lookup(dict,"comm");
1331 if (!comms_cfg) cfgfatal(loc,"site","closure list \"comm\" not found");
1332 st->ncomms=list_length(comms_cfg);
1333 st->comms=safe_malloc_ary(sizeof(*st->comms),st->ncomms,"comms");
1335 for (i=0; i<st->ncomms; i++) {
1336 item_t *item=list_elem(comms_cfg,i);
1337 if (item->type!=t_closure) cfgfatal(loc,"site","comm is not a closure");
1338 closure_t *cl=item->data.closure;
1339 if (cl->type!=CL_COMM) cfgfatal(loc,"site","comm closure wrong type");
1340 st->comms[i]=cl->interface;
1343 st->log=find_cl_if(dict,"log",CL_LOG,True,"site",loc);
1344 st->random=find_cl_if(dict,"random",CL_RANDOMSRC,True,"site",loc);
1346 st->remote_addr_config=st->comms[0]->peer_addr_config(
1347 st->comms[0]->st,dict,loc,"site");
1348 st->privkey=find_cl_if(dict,"local-key",CL_RSAPRIVKEY,True,"site",loc);
1349 st->pubkey=find_cl_if(dict,"key",CL_RSAPUBKEY,True,"site",loc);
1352 find_cl_if(dict,"transform",CL_TRANSFORM,True,"site",loc);
1354 st->dh=find_cl_if(dict,"dh",CL_DH,True,"site",loc);
1355 st->hash=find_cl_if(dict,"hash",CL_HASH,True,"site",loc);
1357 #define DEFAULT(D) (st->peer_mobile || local_mobile \
1358 ? DEFAULT_MOBILE_##D : DEFAULT_##D)
1359 #define CFG_NUMBER(k,D) dict_read_number(dict,(k),False,"site",loc,DEFAULT(D));
1361 st->key_lifetime= CFG_NUMBER("key-lifetime", KEY_LIFETIME);
1362 st->setup_retries= CFG_NUMBER("setup-retries", SETUP_RETRIES);
1363 st->setup_retry_interval= CFG_NUMBER("setup-timeout", SETUP_RETRY_INTERVAL);
1364 st->wait_timeout= CFG_NUMBER("wait-time", WAIT_TIME);
1366 st->mobile_peer_expiry= dict_read_number(
1367 dict,"mobile-peer-expiry",False,"site",loc,DEFAULT_MOBILE_PEER_EXPIRY);
1369 st->transport_peers_max= !st->peer_mobile ? 1 : dict_read_number(
1370 dict,"mobile-peers-max",False,"site",loc,DEFAULT_MOBILE_PEERS_MAX);
1371 if (st->transport_peers_max<1 ||
1372 st->transport_peers_max>=MAX_MOBILE_PEERS_MAX) {
1373 cfgfatal(loc,"site","mobile-peers-max must be in range 1.."
1374 STRING(MAX_MOBILE_PEERS_MAX) "\n");
1377 if (st->key_lifetime < DEFAULT(KEY_RENEGOTIATE_GAP)*2)
1378 st->key_renegotiate_time=st->key_lifetime/2;
1380 st->key_renegotiate_time=st->key_lifetime-DEFAULT(KEY_RENEGOTIATE_GAP);
1381 st->key_renegotiate_time=dict_read_number(
1382 dict,"renegotiate-time",False,"site",loc,st->key_renegotiate_time);
1383 if (st->key_renegotiate_time > st->key_lifetime) {
1384 cfgfatal(loc,"site",
1385 "renegotiate-time must be less than key-lifetime\n");
1388 st->log_events=string_list_to_word(dict_lookup(dict,"log-events"),
1389 log_event_table,"site");
1391 st->tunname=safe_malloc(strlen(st->localname)+strlen(st->remotename)+5,
1393 sprintf(st->tunname,"%s<->%s",st->localname,st->remotename);
1395 /* The information we expect to see in incoming messages of type 1 */
1396 /* fixme: lots of unchecked overflows here, but the results are only
1397 corrupted packets rather than undefined behaviour */
1398 st->setupsiglen=strlen(st->remotename)+strlen(st->localname)+8;
1399 st->setupsig=safe_malloc(st->setupsiglen,"site_apply");
1400 put_uint32(st->setupsig+0,LABEL_MSG1);
1401 put_uint16(st->setupsig+4,strlen(st->remotename));
1402 memcpy(&st->setupsig[6],st->remotename,strlen(st->remotename));
1403 put_uint16(st->setupsig+(6+strlen(st->remotename)),strlen(st->localname));
1404 memcpy(&st->setupsig[8+strlen(st->remotename)],st->localname,
1405 strlen(st->localname));
1406 st->setup_priority=(strcmp(st->localname,st->remotename)>0);
1408 buffer_new(&st->buffer,SETUP_BUFFER_LEN);
1410 /* We are interested in poll(), but only for timeouts. We don't have
1411 any fds of our own. */
1412 register_for_poll(st, site_beforepoll, site_afterpoll, 0, "site");
1415 st->current_valid=False;
1416 st->current_key_timeout=0;
1417 transport_peers_clear(st,&st->peers);
1418 transport_peers_clear(st,&st->setup_peers);
1419 /* XXX mlock these */
1420 st->dhsecret=safe_malloc(st->dh->len,"site:dhsecret");
1421 st->sharedsecret=safe_malloc(st->transform->keylen,"site:sharedsecret");
1423 /* We need to compute some properties of our comms */
1424 #define COMPUTE_WORST(pad) \
1425 int worst_##pad=0; \
1426 for (i=0; i<st->ncomms; i++) { \
1427 int thispad=st->comms[i]->pad; \
1428 if (thispad > worst_##pad) \
1429 worst_##pad=thispad; \
1431 COMPUTE_WORST(min_start_pad)
1432 COMPUTE_WORST(min_end_pad)
1434 /* We need to register the remote networks with the netlink device */
1435 st->netlink->reg(st->netlink->st, site_outgoing, st,
1436 st->transform->max_start_pad+(4*4)+
1437 worst_min_start_pad,
1438 st->transform->max_end_pad+worst_min_end_pad);
1440 for (i=0; i<st->ncomms; i++)
1441 st->comms[i]->request_notify(st->comms[i]->st, st, site_incoming);
1443 st->current_transform=st->transform->create(st->transform->st);
1444 st->new_transform=st->transform->create(st->transform->st);
1446 enter_state_stop(st);
1448 add_hook(PHASE_SHUTDOWN,site_phase_hook,st);
1450 return new_closure(&st->cl);
1453 void site_module(dict_t *dict)
1455 add_closure(dict,"site",site_apply);
1459 /***** TRANSPORT PEERS definitions *****/
1461 static void transport_peers_debug(struct site *st, transport_peers *dst,
1462 const char *didwhat,
1463 int nargs, const struct comm_addr *args,
1468 if (!(st->log_events & LOG_PEER_ADDRS))
1469 return; /* an optimisation */
1471 slog(st, LOG_PEER_ADDRS, "peers (%s) %s nargs=%d => npeers=%d",
1472 (dst==&st->peers ? "data" :
1473 dst==&st->setup_peers ? "setup" : "UNKNOWN"),
1474 didwhat, nargs, dst->npeers);
1476 for (i=0, argp=(void*)args;
1478 i++, (argp+=stride?stride:sizeof(*args))) {
1479 const struct comm_addr *ca=(void*)argp;
1480 slog(st, LOG_PEER_ADDRS, " args: addrs[%d]=%s",
1481 i, ca->comm->addr_to_string(ca->comm->st,ca));
1483 for (i=0; i<dst->npeers; i++) {
1484 struct timeval diff;
1485 timersub(tv_now,&dst->peers[i].last,&diff);
1486 const struct comm_addr *ca=&dst->peers[i].addr;
1487 slog(st, LOG_PEER_ADDRS, " peers: addrs[%d]=%s T-%ld.%06ld",
1488 i, ca->comm->addr_to_string(ca->comm->st,ca),
1489 (unsigned long)diff.tv_sec, (unsigned long)diff.tv_usec);
1493 static int transport_peer_compar(const void *av, const void *bv) {
1494 const transport_peer *a=av;
1495 const transport_peer *b=bv;
1496 /* put most recent first in the array */
1497 if (timercmp(&a->last, &b->last, <)) return +1;
1498 if (timercmp(&a->last, &b->last, >)) return -11;
1502 static void transport_peers_expire(struct site *st, transport_peers *peers) {
1503 /* peers must be sorted first */
1504 int previous_peers=peers->npeers;
1505 struct timeval oldest;
1506 oldest.tv_sec = tv_now->tv_sec - st->mobile_peer_expiry;
1507 oldest.tv_usec = tv_now->tv_usec;
1508 while (peers->npeers>1 &&
1509 timercmp(&peers->peers[peers->npeers-1].last, &oldest, <))
1511 if (peers->npeers != previous_peers)
1512 transport_peers_debug(st,peers,"expire", 0,0,0);
1515 static void transport_record_peer(struct site *st, transport_peers *peers,
1516 const struct comm_addr *addr, const char *m) {
1517 int slot, changed=0;
1519 for (slot=0; slot<peers->npeers; slot++)
1520 if (!memcmp(&peers->peers[slot].addr, addr, sizeof(*addr)))
1524 if (peers->npeers==st->transport_peers_max)
1525 slot=st->transport_peers_max;
1527 slot=peers->npeers++;
1530 peers->peers[slot].addr=*addr;
1531 peers->peers[slot].last=*tv_now;
1533 if (peers->npeers>1)
1534 qsort(peers->peers, peers->npeers,
1535 sizeof(*peers->peers), transport_peer_compar);
1537 if (changed || peers->npeers!=1)
1538 transport_peers_debug(st,peers,m, 1,addr,0);
1539 transport_peers_expire(st, peers);
1542 static bool_t transport_compute_setupinit_peers(struct site *st,
1543 const struct comm_addr *configured_addr /* 0 if none or not found */) {
1545 if (!configured_addr && !transport_peers_valid(&st->peers))
1548 slog(st,LOG_SETUP_INIT,
1549 (!configured_addr ? "using only %d old peer address(es)"
1550 : "using configured address, and/or perhaps %d old peer address(es)"),
1553 /* Non-mobile peers havve st->peers.npeers==0 or ==1, since they
1554 * have transport_peers_max==1. The effect is that this code
1555 * always uses the configured address if supplied, or otherwise
1556 * the existing data peer if one exists; this is as desired. */
1558 transport_peers_copy(st,&st->setup_peers,&st->peers);
1560 if (configured_addr)
1561 transport_record_peer(st,&st->setup_peers,configured_addr,"setupinit");
1563 assert(transport_peers_valid(&st->setup_peers));
1567 static void transport_setup_msgok(struct site *st, const struct comm_addr *a) {
1568 if (st->peer_mobile)
1569 transport_record_peer(st,&st->setup_peers,a,"setupmsg");
1571 static void transport_data_msgok(struct site *st, const struct comm_addr *a) {
1572 if (st->peer_mobile)
1573 transport_record_peer(st,&st->peers,a,"datamsg");
1576 static int transport_peers_valid(transport_peers *peers) {
1577 return peers->npeers;
1579 static void transport_peers_clear(struct site *st, transport_peers *peers) {
1581 transport_peers_debug(st,peers,"clear",0,0,0);
1583 static void transport_peers_copy(struct site *st, transport_peers *dst,
1584 const transport_peers *src) {
1585 dst->npeers=src->npeers;
1586 memcpy(dst->peers, src->peers, sizeof(*dst->peers) * dst->npeers);
1587 transport_peers_debug(st,dst,"copy",
1588 src->npeers, &src->peers->addr, sizeof(src->peers));
1591 void transport_xmit(struct site *st, transport_peers *peers,
1592 struct buffer_if *buf, bool_t candebug) {
1594 transport_peers_expire(st, peers);
1595 for (slot=0; slot<peers->npeers; slot++) {
1596 transport_peer *peer=&peers->peers[slot];
1598 dump_packet(st, buf, &peer->addr, False);
1599 peer->addr.comm->sendmsg(peer->addr.comm->st, buf, &peer->addr);
1603 /***** END of transport peers declarations *****/