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] */
35 #define DEFAULT_MOBILE_PEER_EXPIRY (2*60) /* [s] */
36 #define DEFAULT_MOBILE_PEERS_MAX 3 /* send at most this many copies (default) */
38 /* Each site can be in one of several possible states. */
41 SITE_STOP - nothing is allowed to happen; tunnel is down;
42 all session keys have been erased
43 -> SITE_RUN upon external instruction
44 SITE_RUN - site up, maybe with valid key
45 -> SITE_RESOLVE upon outgoing packet and no valid key
46 we start name resolution for the other end of the tunnel
47 -> SITE_SENTMSG2 upon valid incoming message 1 and suitable time
48 we send an appropriate message 2
49 SITE_RESOLVE - waiting for name resolution
50 -> SITE_SENTMSG1 upon successful resolution
51 we send an appropriate message 1
52 -> SITE_SENTMSG2 upon valid incoming message 1 (then abort resolution)
53 we abort resolution and
54 -> SITE_WAIT on timeout or resolution failure
56 -> SITE_SENTMSG2 upon valid incoming message 1 from higher priority end
57 -> SITE_SENTMSG3 upon valid incoming message 2
58 -> SITE_WAIT on timeout
60 -> SITE_SENTMSG4 upon valid incoming message 3
61 -> SITE_WAIT on timeout
63 -> SITE_SENTMSG5 upon valid incoming message 4
64 -> SITE_WAIT on timeout
66 -> SITE_RUN upon valid incoming message 5
67 -> SITE_WAIT on timeout
69 -> SITE_RUN upon valid incoming message 6
70 -> SITE_WAIT on timeout
71 SITE_WAIT - failed to establish key; do nothing for a while
72 -> SITE_RUN on timeout
77 #define SITE_RESOLVE 2
78 #define SITE_SENTMSG1 3
79 #define SITE_SENTMSG2 4
80 #define SITE_SENTMSG3 5
81 #define SITE_SENTMSG4 6
82 #define SITE_SENTMSG5 7
85 static cstring_t state_name(uint32_t state)
88 case 0: return "STOP";
90 case 2: return "RESOLVE";
91 case 3: return "SENTMSG1";
92 case 4: return "SENTMSG2";
93 case 5: return "SENTMSG3";
94 case 6: return "SENTMSG4";
95 case 7: return "SENTMSG5";
96 case 8: return "WAIT";
97 default: return "*bad state*";
103 #define LOG_UNEXPECTED 0x00000001
104 #define LOG_SETUP_INIT 0x00000002
105 #define LOG_SETUP_TIMEOUT 0x00000004
106 #define LOG_ACTIVATE_KEY 0x00000008
107 #define LOG_TIMEOUT_KEY 0x00000010
108 #define LOG_SEC 0x00000020
109 #define LOG_STATE 0x00000040
110 #define LOG_DROP 0x00000080
111 #define LOG_DUMP 0x00000100
112 #define LOG_ERROR 0x00000400
113 #define LOG_PEER_ADDRS 0x00000800
115 static struct flagstr log_event_table[]={
116 { "unexpected", LOG_UNEXPECTED },
117 { "setup-init", LOG_SETUP_INIT },
118 { "setup-timeout", LOG_SETUP_TIMEOUT },
119 { "activate-key", LOG_ACTIVATE_KEY },
120 { "timeout-key", LOG_TIMEOUT_KEY },
121 { "security", LOG_SEC },
122 { "state-change", LOG_STATE },
123 { "packet-drop", LOG_DROP },
124 { "dump-packets", LOG_DUMP },
125 { "errors", LOG_ERROR },
126 { "peer-addrs", LOG_PEER_ADDRS },
127 { "default", LOG_SETUP_INIT|LOG_SETUP_TIMEOUT|
128 LOG_ACTIVATE_KEY|LOG_TIMEOUT_KEY|LOG_SEC|LOG_ERROR },
129 { "all", 0xffffffff },
134 /***** TRANSPORT PEERS declarations *****/
136 /* Details of "mobile peer" semantics:
138 - We record mobile_peers_max peer address/port numbers ("peers")
139 for key setup, and separately mobile_peers_max for data
140 transfer. If these lists fill up, we retain the newest peers.
141 (For non-mobile peers we only record one of each.)
143 - Outgoing packets are sent to every recorded peer in the
146 - Data transfer peers are straightforward: whenever we successfully
147 process a data packet, we record the peer. Also, whenever we
148 successfully complete a key setup, we merge the key setup
149 peers into the data transfer peers.
151 (For "non-mobile" peers we simply copy the peer used for
152 successful key setup, and don't change the peer otherwise.)
154 - Key setup peers are slightly more complicated.
156 Whenever we receive and successfully process a key exchange
157 packet, we record the peer.
159 Whenever we try to initiate a key setup, we copy the list of data
160 transfer peers and use it for key setup. But we also look to see
161 if the config supplies an address and port number and if so we
162 add that as a key setup peer (possibly evicting one of the data
163 transfer peers we just copied).
165 (For "non-mobile" peers, if we if we have a configured peer
166 address and port, we always use that; otherwise if we have a
167 current data peer address we use that; otherwise we do not
168 attempt to initiate a key setup for lack of a peer address.)
170 "Record the peer" means
171 1. expire any peers last seen >120s ("mobile-peer-expiry") ago
172 2. add the peer of the just received packet to the applicable list
173 (possibly evicting older entries)
174 NB that we do not expire peers until an incoming packet arrives.
178 #define MAX_MOBILE_PEERS_MAX 5 /* send at most this many copies, compiled max */
182 struct comm_addr addr;
186 /* configuration information */
187 /* runtime information */
189 transport_peer peers[MAX_MOBILE_PEERS_MAX];
192 static void transport_peers_clear(struct site *st, transport_peers *peers);
193 static int transport_peers_valid(transport_peers *peers);
194 static void transport_peers_copy(struct site *st, transport_peers *dst,
195 const transport_peers *src);
197 static void transport_setup_msgok(struct site *st, const struct comm_addr *a);
198 static void transport_data_msgok(struct site *st, const struct comm_addr *a);
199 static bool_t transport_compute_setupinit_peers(struct site *st,
200 const struct comm_addr *configured_addr /* 0 if none or not found */);
201 static void transport_record_peer(struct site *st, transport_peers *peers,
202 const struct comm_addr *addr, const char *m);
204 static void transport_xmit(struct site *st, transport_peers *peers,
205 struct buffer_if *buf, bool_t candebug);
207 /***** END of transport peers declarations *****/
213 /* configuration information */
216 bool_t peer_mobile; /* Mobile client support */
217 int32_t transport_peers_max;
218 string_t tunname; /* localname<->remotename by default, used in logs */
219 string_t address; /* DNS name for bootstrapping, optional */
220 int remoteport; /* Port for bootstrapping, optional */
221 struct netlink_if *netlink;
222 struct comm_if *comm;
223 struct resolver_if *resolver;
225 struct random_if *random;
226 struct rsaprivkey_if *privkey;
227 struct rsapubkey_if *pubkey;
228 struct transform_if *transform;
230 struct hash_if *hash;
232 uint32_t index; /* Index of this site */
233 int32_t setup_retries; /* How many times to send setup packets */
234 int32_t setup_retry_interval; /* Initial timeout for setup packets */
235 int32_t wait_timeout; /* How long to wait if setup unsuccessful */
236 int32_t mobile_peer_expiry; /* How long to remember 2ary addresses */
237 int32_t key_lifetime; /* How long a key lasts once set up */
238 int32_t key_renegotiate_time; /* If we see traffic (or a keepalive)
239 after this time, initiate a new
242 uint8_t *setupsig; /* Expected signature of incoming MSG1 packets */
243 int32_t setupsiglen; /* Allows us to discard packets quickly if
244 they are not for us */
245 bool_t setup_priority; /* Do we have precedence if both sites emit
246 message 1 simultaneously? */
249 /* runtime information */
251 uint64_t now; /* Most recently seen time */
253 /* The currently established session */
254 uint32_t remote_session_id;
255 struct transform_inst_if *current_transform;
256 bool_t current_valid;
257 uint64_t current_key_timeout; /* End of life of current key */
258 uint64_t renegotiate_key_time; /* When we can negotiate a new key */
259 transport_peers peers; /* Current address(es) of peer for data traffic */
261 /* The current key setup protocol exchange. We can only be
262 involved in one of these at a time. There's a potential for
263 denial of service here (the attacker keeps sending a setup
264 packet; we keep trying to continue the exchange, and have to
265 timeout before we can listen for another setup packet); perhaps
266 we should keep a list of 'bad' sources for setup packets. */
267 uint32_t setup_session_id;
268 transport_peers setup_peers;
269 uint8_t localN[NONCELEN]; /* Nonces for key exchange */
270 uint8_t remoteN[NONCELEN];
271 struct buffer_if buffer; /* Current outgoing key exchange packet */
272 int32_t retries; /* Number of retries remaining */
273 uint64_t timeout; /* Timeout for current state */
275 uint8_t *sharedsecret;
276 struct transform_inst_if *new_transform; /* For key setup/verify */
279 static void slog(struct site *st, uint32_t event, cstring_t msg, ...)
287 if (event&st->log_events) {
289 case LOG_UNEXPECTED: class=M_INFO; break;
290 case LOG_SETUP_INIT: class=M_INFO; break;
291 case LOG_SETUP_TIMEOUT: class=M_NOTICE; break;
292 case LOG_ACTIVATE_KEY: class=M_INFO; break;
293 case LOG_TIMEOUT_KEY: class=M_INFO; break;
294 case LOG_SEC: class=M_SECURITY; break;
295 case LOG_STATE: class=M_DEBUG; break;
296 case LOG_DROP: class=M_DEBUG; break;
297 case LOG_DUMP: class=M_DEBUG; break;
298 case LOG_ERROR: class=M_ERR; break;
299 case LOG_PEER_ADDRS: class=M_DEBUG; break;
300 default: class=M_ERR; break;
303 vsnprintf(buf,sizeof(buf),msg,ap);
304 st->log->log(st->log->st,class,"%s: %s",st->tunname,buf);
309 static void set_link_quality(struct site *st);
310 static void delete_key(struct site *st, cstring_t reason, uint32_t loglevel);
311 static bool_t initiate_key_setup(struct site *st, cstring_t reason);
312 static void enter_state_run(struct site *st);
313 static bool_t enter_state_resolve(struct site *st);
314 static bool_t enter_new_state(struct site *st,uint32_t next);
315 static void enter_state_wait(struct site *st);
317 #define CHECK_AVAIL(b,l) do { if ((b)->size<(l)) return False; } while(0)
318 #define CHECK_EMPTY(b) do { if ((b)->size!=0) return False; } while(0)
319 #define CHECK_TYPE(b,t) do { uint32_t type; \
320 CHECK_AVAIL((b),4); \
321 type=buf_unprepend_uint32((b)); \
322 if (type!=(t)) return False; } while(0)
341 /* Build any of msg1 to msg4. msg5 and msg6 are built from the inside
342 out using a transform of config data supplied by netlink */
343 static bool_t generate_msg(struct site *st, uint32_t type, cstring_t what)
349 st->retries=st->setup_retries;
350 BUF_ALLOC(&st->buffer,what);
351 buffer_init(&st->buffer,0);
352 buf_append_uint32(&st->buffer,
353 (type==LABEL_MSG1?0:st->setup_session_id));
354 buf_append_uint32(&st->buffer,st->index);
355 buf_append_uint32(&st->buffer,type);
356 buf_append_string(&st->buffer,st->localname);
357 buf_append_string(&st->buffer,st->remotename);
358 memcpy(buf_append(&st->buffer,NONCELEN),st->localN,NONCELEN);
359 if (type==LABEL_MSG1) return True;
360 memcpy(buf_append(&st->buffer,NONCELEN),st->remoteN,NONCELEN);
361 if (type==LABEL_MSG2) return True;
363 if (hacky_par_mid_failnow()) return False;
365 dhpub=st->dh->makepublic(st->dh->st,st->dhsecret,st->dh->len);
366 buf_append_string(&st->buffer,dhpub);
368 hash=safe_malloc(st->hash->len, "generate_msg");
369 hst=st->hash->init();
370 st->hash->update(hst,st->buffer.start,st->buffer.size);
371 st->hash->final(hst,hash);
372 sig=st->privkey->sign(st->privkey->st,hash,st->hash->len);
373 buf_append_string(&st->buffer,sig);
379 static bool_t unpick_msg(struct site *st, uint32_t type,
380 struct buffer_if *msg, struct msg *m)
382 m->hashstart=msg->start;
384 m->dest=buf_unprepend_uint32(msg);
386 m->source=buf_unprepend_uint32(msg);
387 CHECK_TYPE(msg,type);
389 m->remlen=buf_unprepend_uint16(msg);
390 CHECK_AVAIL(msg,m->remlen);
391 m->remote=buf_unprepend(msg,m->remlen);
393 m->loclen=buf_unprepend_uint16(msg);
394 CHECK_AVAIL(msg,m->loclen);
395 m->local=buf_unprepend(msg,m->loclen);
396 CHECK_AVAIL(msg,NONCELEN);
397 m->nR=buf_unprepend(msg,NONCELEN);
398 if (type==LABEL_MSG1) {
402 CHECK_AVAIL(msg,NONCELEN);
403 m->nL=buf_unprepend(msg,NONCELEN);
404 if (type==LABEL_MSG2) {
409 m->pklen=buf_unprepend_uint16(msg);
410 CHECK_AVAIL(msg,m->pklen);
411 m->pk=buf_unprepend(msg,m->pklen);
412 m->hashlen=msg->start-m->hashstart;
414 m->siglen=buf_unprepend_uint16(msg);
415 CHECK_AVAIL(msg,m->siglen);
416 m->sig=buf_unprepend(msg,m->siglen);
421 static bool_t check_msg(struct site *st, uint32_t type, struct msg *m,
424 if (type==LABEL_MSG1) return True;
426 /* Check that the site names and our nonce have been sent
427 back correctly, and then store our peer's nonce. */
428 if (memcmp(m->remote,st->remotename,strlen(st->remotename)!=0)) {
429 *error="wrong remote site name";
432 if (memcmp(m->local,st->localname,strlen(st->localname)!=0)) {
433 *error="wrong local site name";
436 if (memcmp(m->nL,st->localN,NONCELEN)!=0) {
437 *error="wrong locally-generated nonce";
440 if (type==LABEL_MSG2) return True;
441 if (memcmp(m->nR,st->remoteN,NONCELEN)!=0) {
442 *error="wrong remotely-generated nonce";
445 if (type==LABEL_MSG3) return True;
446 if (type==LABEL_MSG4) return True;
447 *error="unknown message type";
451 static bool_t generate_msg1(struct site *st)
453 st->random->generate(st->random->st,NONCELEN,st->localN);
454 return generate_msg(st,LABEL_MSG1,"site:MSG1");
457 static bool_t process_msg1(struct site *st, struct buffer_if *msg1,
458 const struct comm_addr *src)
462 /* We've already determined we're in an appropriate state to
463 process an incoming MSG1, and that the MSG1 has correct values
466 if (!unpick_msg(st,LABEL_MSG1,msg1,&m)) return False;
468 transport_record_peer(st,&st->setup_peers,src,"msg1");
469 st->setup_session_id=m.source;
470 memcpy(st->remoteN,m.nR,NONCELEN);
474 static bool_t generate_msg2(struct site *st)
476 st->random->generate(st->random->st,NONCELEN,st->localN);
477 return generate_msg(st,LABEL_MSG2,"site:MSG2");
480 static bool_t process_msg2(struct site *st, struct buffer_if *msg2,
481 const struct comm_addr *src)
486 if (!unpick_msg(st,LABEL_MSG2,msg2,&m)) return False;
487 if (!check_msg(st,LABEL_MSG2,&m,&err)) {
488 slog(st,LOG_SEC,"msg2: %s",err);
491 st->setup_session_id=m.source;
492 memcpy(st->remoteN,m.nR,NONCELEN);
496 static bool_t generate_msg3(struct site *st)
498 /* Now we have our nonce and their nonce. Think of a secret key,
499 and create message number 3. */
500 st->random->generate(st->random->st,st->dh->len,st->dhsecret);
501 return generate_msg(st,LABEL_MSG3,"site:MSG3");
504 static bool_t process_msg3(struct site *st, struct buffer_if *msg3,
505 const struct comm_addr *src)
512 if (!unpick_msg(st,LABEL_MSG3,msg3,&m)) return False;
513 if (!check_msg(st,LABEL_MSG3,&m,&err)) {
514 slog(st,LOG_SEC,"msg3: %s",err);
518 /* Check signature and store g^x mod m */
519 hash=safe_malloc(st->hash->len, "process_msg3");
520 hst=st->hash->init();
521 st->hash->update(hst,m.hashstart,m.hashlen);
522 st->hash->final(hst,hash);
523 /* Terminate signature with a '0' - cheating, but should be ok */
525 if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) {
526 slog(st,LOG_SEC,"msg3 signature failed check!");
532 /* Terminate their DH public key with a '0' */
534 /* Invent our DH secret key */
535 st->random->generate(st->random->st,st->dh->len,st->dhsecret);
537 /* Generate the shared key */
538 st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk,
539 st->sharedsecret,st->transform->keylen);
541 /* Set up the transform */
542 st->new_transform->setkey(st->new_transform->st,st->sharedsecret,
543 st->transform->keylen);
548 static bool_t generate_msg4(struct site *st)
550 /* We have both nonces, their public key and our private key. Generate
551 our public key, sign it and send it to them. */
552 return generate_msg(st,LABEL_MSG4,"site:MSG4");
555 static bool_t process_msg4(struct site *st, struct buffer_if *msg4,
556 const struct comm_addr *src)
563 if (!unpick_msg(st,LABEL_MSG4,msg4,&m)) return False;
564 if (!check_msg(st,LABEL_MSG4,&m,&err)) {
565 slog(st,LOG_SEC,"msg4: %s",err);
569 /* Check signature and store g^x mod m */
570 hash=safe_malloc(st->hash->len, "process_msg4");
571 hst=st->hash->init();
572 st->hash->update(hst,m.hashstart,m.hashlen);
573 st->hash->final(hst,hash);
574 /* Terminate signature with a '0' - cheating, but should be ok */
576 if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) {
577 slog(st,LOG_SEC,"msg4 signature failed check!");
583 /* Terminate their DH public key with a '0' */
585 /* Generate the shared key */
586 st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk,
587 st->sharedsecret,st->transform->keylen);
588 /* Set up the transform */
589 st->new_transform->setkey(st->new_transform->st,st->sharedsecret,
590 st->transform->keylen);
601 static bool_t unpick_msg0(struct site *st, struct buffer_if *msg0,
605 m->dest=buf_unprepend_uint32(msg0);
607 m->source=buf_unprepend_uint32(msg0);
609 m->type=buf_unprepend_uint32(msg0);
611 /* Leaves transformed part of buffer untouched */
614 static bool_t generate_msg5(struct site *st)
616 cstring_t transform_err;
618 BUF_ALLOC(&st->buffer,"site:MSG5");
619 /* We are going to add four words to the message */
620 buffer_init(&st->buffer,st->transform->max_start_pad+(4*4));
621 /* Give the netlink code an opportunity to put its own stuff in the
622 message (configuration information, etc.) */
623 st->netlink->output_config(st->netlink->st,&st->buffer);
624 buf_prepend_uint32(&st->buffer,LABEL_MSG5);
625 st->new_transform->forwards(st->new_transform->st,&st->buffer,
627 buf_prepend_uint32(&st->buffer,LABEL_MSG5);
628 buf_prepend_uint32(&st->buffer,st->index);
629 buf_prepend_uint32(&st->buffer,st->setup_session_id);
631 st->retries=st->setup_retries;
635 static bool_t process_msg5(struct site *st, struct buffer_if *msg5,
636 const struct comm_addr *src)
639 cstring_t transform_err;
641 if (!unpick_msg0(st,msg5,&m)) return False;
643 if (st->new_transform->reverse(st->new_transform->st,
644 msg5,&transform_err)) {
645 /* There's a problem */
646 slog(st,LOG_SEC,"process_msg5: transform: %s",transform_err);
649 /* Buffer should now contain untransformed PING packet data */
651 if (buf_unprepend_uint32(msg5)!=LABEL_MSG5) {
652 slog(st,LOG_SEC,"MSG5/PING packet contained wrong label");
655 if (!st->netlink->check_config(st->netlink->st,msg5)) {
656 slog(st,LOG_SEC,"MSG5/PING packet contained bad netlink config");
663 static bool_t generate_msg6(struct site *st)
665 cstring_t transform_err;
667 BUF_ALLOC(&st->buffer,"site:MSG6");
668 /* We are going to add four words to the message */
669 buffer_init(&st->buffer,st->transform->max_start_pad+(4*4));
670 /* Give the netlink code an opportunity to put its own stuff in the
671 message (configuration information, etc.) */
672 st->netlink->output_config(st->netlink->st,&st->buffer);
673 buf_prepend_uint32(&st->buffer,LABEL_MSG6);
674 st->new_transform->forwards(st->new_transform->st,&st->buffer,
676 buf_prepend_uint32(&st->buffer,LABEL_MSG6);
677 buf_prepend_uint32(&st->buffer,st->index);
678 buf_prepend_uint32(&st->buffer,st->setup_session_id);
680 st->retries=1; /* Peer will retransmit MSG5 if this packet gets lost */
684 static bool_t process_msg6(struct site *st, struct buffer_if *msg6,
685 const struct comm_addr *src)
688 cstring_t transform_err;
690 if (!unpick_msg0(st,msg6,&m)) return False;
692 if (st->new_transform->reverse(st->new_transform->st,
693 msg6,&transform_err)) {
694 /* There's a problem */
695 slog(st,LOG_SEC,"process_msg6: transform: %s",transform_err);
698 /* Buffer should now contain untransformed PING packet data */
700 if (buf_unprepend_uint32(msg6)!=LABEL_MSG6) {
701 slog(st,LOG_SEC,"MSG6/PONG packet contained invalid data");
704 if (!st->netlink->check_config(st->netlink->st,msg6)) {
705 slog(st,LOG_SEC,"MSG6/PONG packet contained bad netlink config");
712 static bool_t process_msg0(struct site *st, struct buffer_if *msg0,
713 const struct comm_addr *src)
716 cstring_t transform_err;
719 if (!st->current_valid) {
720 slog(st,LOG_DROP,"incoming message but no current key -> dropping");
721 return initiate_key_setup(st,"incoming message but no current key");
724 if (!unpick_msg0(st,msg0,&m)) return False;
726 if (st->current_transform->reverse(st->current_transform->st,
727 msg0,&transform_err)) {
728 /* There's a problem */
729 slog(st,LOG_SEC,"transform: %s",transform_err);
730 return initiate_key_setup(st,"incoming message would not decrypt");
733 type=buf_unprepend_uint32(msg0);
736 /* We must forget about the current session. */
737 delete_key(st,"request from peer",LOG_SEC);
740 /* Deliver to netlink layer */
741 st->netlink->deliver(st->netlink->st,msg0);
742 transport_data_msgok(st,src);
743 /* See whether we should start negotiating a new key */
744 if (st->now > st->renegotiate_key_time)
745 initiate_key_setup(st,"incoming packet in renegotiation window");
748 slog(st,LOG_SEC,"incoming encrypted message of type %08x "
755 static void dump_packet(struct site *st, struct buffer_if *buf,
756 const struct comm_addr *addr, bool_t incoming)
758 uint32_t dest=ntohl(*(uint32_t *)buf->start);
759 uint32_t source=ntohl(*(uint32_t *)(buf->start+4));
760 uint32_t msgtype=ntohl(*(uint32_t *)(buf->start+8));
762 if (st->log_events & LOG_DUMP)
763 slilog(st->log,M_DEBUG,"%s: %s: %08x<-%08x: %08x:",
764 st->tunname,incoming?"incoming":"outgoing",
765 dest,source,msgtype);
768 static uint32_t site_status(void *st)
773 static bool_t send_msg(struct site *st)
776 transport_xmit(st, &st->setup_peers, &st->buffer, True);
777 st->timeout=st->now+st->setup_retry_interval;
781 slog(st,LOG_SETUP_TIMEOUT,"timed out sending key setup packet "
782 "(in state %s)",state_name(st->state));
783 enter_state_wait(st);
788 static void site_resolve_callback(void *sst, struct in_addr *address)
791 struct comm_addr ca_buf, *ca_use;
793 if (st->state!=SITE_RESOLVE) {
794 slog(st,LOG_UNEXPECTED,"site_resolve_callback called unexpectedly");
799 ca_buf.comm=st->comm;
800 ca_buf.sin.sin_family=AF_INET;
801 ca_buf.sin.sin_port=htons(st->remoteport);
802 ca_buf.sin.sin_addr=*address;
805 slog(st,LOG_ERROR,"resolution of %s failed",st->address);
808 if (transport_compute_setupinit_peers(st,ca_use)) {
809 enter_new_state(st,SITE_SENTMSG1);
811 /* Can't figure out who to try to to talk to */
812 slog(st,LOG_SETUP_INIT,"key exchange failed: cannot find peer address");
817 static bool_t initiate_key_setup(struct site *st, cstring_t reason)
819 if (st->state!=SITE_RUN) return False;
820 slog(st,LOG_SETUP_INIT,"initiating key exchange (%s)",reason);
822 slog(st,LOG_SETUP_INIT,"resolving peer address");
823 return enter_state_resolve(st);
824 } else if (transport_compute_setupinit_peers(st,0)) {
825 return enter_new_state(st,SITE_SENTMSG1);
827 slog(st,LOG_SETUP_INIT,"key exchange failed: no address for peer");
831 static void activate_new_key(struct site *st)
833 struct transform_inst_if *t;
835 /* We have two transform instances, which we swap between active
837 t=st->current_transform;
838 st->current_transform=st->new_transform;
843 st->current_valid=True;
844 st->current_key_timeout=st->now+st->key_lifetime;
845 st->renegotiate_key_time=st->now+st->key_renegotiate_time;
846 transport_peers_copy(st,&st->peers,&st->setup_peers);
847 st->remote_session_id=st->setup_session_id;
849 slog(st,LOG_ACTIVATE_KEY,"new key activated");
853 static void delete_key(struct site *st, cstring_t reason, uint32_t loglevel)
855 if (st->current_valid) {
856 slog(st,loglevel,"session closed (%s)",reason);
858 st->current_valid=False;
859 st->current_transform->delkey(st->current_transform->st);
860 st->current_key_timeout=0;
861 set_link_quality(st);
865 static void state_assert(struct site *st, bool_t ok)
867 if (!ok) fatal("site:state_assert");
870 static void enter_state_stop(struct site *st)
874 delete_key(st,"entering state STOP",LOG_TIMEOUT_KEY);
875 st->new_transform->delkey(st->new_transform->st);
878 static void set_link_quality(struct site *st)
881 if (st->current_valid)
882 quality=LINK_QUALITY_UP;
883 else if (st->state==SITE_WAIT || st->state==SITE_STOP)
884 quality=LINK_QUALITY_DOWN;
885 else if (st->address)
886 quality=LINK_QUALITY_DOWN_CURRENT_ADDRESS;
887 else if (transport_peers_valid(&st->peers))
888 quality=LINK_QUALITY_DOWN_STALE_ADDRESS;
890 quality=LINK_QUALITY_DOWN;
892 st->netlink->set_quality(st->netlink->st,quality);
895 static void enter_state_run(struct site *st)
897 slog(st,LOG_STATE,"entering state RUN");
901 st->setup_session_id=0;
902 transport_peers_clear(st,&st->setup_peers);
903 memset(st->localN,0,NONCELEN);
904 memset(st->remoteN,0,NONCELEN);
905 st->new_transform->delkey(st->new_transform->st);
906 memset(st->dhsecret,0,st->dh->len);
907 memset(st->sharedsecret,0,st->transform->keylen);
908 set_link_quality(st);
911 static bool_t enter_state_resolve(struct site *st)
913 state_assert(st,st->state==SITE_RUN);
914 slog(st,LOG_STATE,"entering state RESOLVE");
915 st->state=SITE_RESOLVE;
916 st->resolver->request(st->resolver->st,st->address,
917 site_resolve_callback,st);
921 static bool_t enter_new_state(struct site *st, uint32_t next)
923 bool_t (*gen)(struct site *st);
926 slog(st,LOG_STATE,"entering state %s",state_name(next));
929 state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE);
933 state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE ||
934 st->state==SITE_SENTMSG1 || st->state==SITE_WAIT);
938 state_assert(st,st->state==SITE_SENTMSG1);
939 BUF_FREE(&st->buffer);
943 state_assert(st,st->state==SITE_SENTMSG2);
944 BUF_FREE(&st->buffer);
948 state_assert(st,st->state==SITE_SENTMSG3);
949 BUF_FREE(&st->buffer);
953 state_assert(st,st->state==SITE_SENTMSG4);
954 BUF_FREE(&st->buffer);
959 fatal("enter_new_state(%s): invalid new state",state_name(next));
963 if (hacky_par_start_failnow()) return False;
965 r= gen(st) && send_msg(st);
968 st->setup_retries, st->setup_retry_interval,
973 if (next==SITE_RUN) {
974 BUF_FREE(&st->buffer); /* Never reused */
975 st->timeout=0; /* Never retransmit */
976 activate_new_key(st);
980 slog(st,LOG_ERROR,"error entering state %s",state_name(next));
981 st->buffer.free=False; /* Unconditionally use the buffer; it may be
982 in either state, and enter_state_wait() will
984 enter_state_wait(st);
988 /* msg7 tells our peer that we're about to forget our key */
989 static bool_t send_msg7(struct site *st, cstring_t reason)
991 cstring_t transform_err;
993 if (st->current_valid && st->buffer.free
994 && transport_peers_valid(&st->peers)) {
995 BUF_ALLOC(&st->buffer,"site:MSG7");
996 buffer_init(&st->buffer,st->transform->max_start_pad+(4*3));
997 buf_append_uint32(&st->buffer,LABEL_MSG7);
998 buf_append_string(&st->buffer,reason);
999 st->current_transform->forwards(st->current_transform->st,
1000 &st->buffer, &transform_err);
1001 buf_prepend_uint32(&st->buffer,LABEL_MSG0);
1002 buf_prepend_uint32(&st->buffer,st->index);
1003 buf_prepend_uint32(&st->buffer,st->remote_session_id);
1004 transport_xmit(st,&st->peers,&st->buffer,True);
1005 BUF_FREE(&st->buffer);
1011 /* We go into this state if our peer becomes uncommunicative. Similar to
1012 the "stop" state, we forget all session keys for a while, before
1013 re-entering the "run" state. */
1014 static void enter_state_wait(struct site *st)
1016 slog(st,LOG_STATE,"entering state WAIT");
1017 st->timeout=st->now+st->wait_timeout;
1018 st->state=SITE_WAIT;
1019 set_link_quality(st);
1020 BUF_FREE(&st->buffer); /* will have had an outgoing packet in it */
1021 /* XXX Erase keys etc. */
1024 static inline void site_settimeout(uint64_t timeout, int *timeout_io)
1027 int64_t offset=timeout-*now;
1028 if (offset<0) offset=0;
1029 if (offset>INT_MAX) offset=INT_MAX;
1030 if (*timeout_io<0 || offset<*timeout_io)
1035 static int site_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
1038 struct site *st=sst;
1040 *nfds_io=0; /* We don't use any file descriptors */
1043 /* Work out when our next timeout is. The earlier of 'timeout' or
1044 'current_key_timeout'. A stored value of '0' indicates no timeout
1046 site_settimeout(st->timeout, timeout_io);
1047 site_settimeout(st->current_key_timeout, timeout_io);
1049 return 0; /* success */
1052 /* NB site_afterpoll will be called before site_beforepoll is ever called */
1053 static void site_afterpoll(void *sst, struct pollfd *fds, int nfds)
1055 struct site *st=sst;
1058 if (st->timeout && *now>st->timeout) {
1060 if (st->state>=SITE_SENTMSG1 && st->state<=SITE_SENTMSG5) {
1061 if (!hacky_par_start_failnow())
1063 } else if (st->state==SITE_WAIT) {
1064 enter_state_run(st);
1066 slog(st,LOG_ERROR,"site_afterpoll: unexpected timeout, state=%d",
1070 if (st->current_key_timeout && *now>st->current_key_timeout) {
1071 delete_key(st,"maximum key life exceeded",LOG_TIMEOUT_KEY);
1075 /* This function is called by the netlink device to deliver packets
1076 intended for the remote network. The packet is in "raw" wire
1077 format, but is guaranteed to be word-aligned. */
1078 static void site_outgoing(void *sst, struct buffer_if *buf)
1080 struct site *st=sst;
1081 cstring_t transform_err;
1083 if (st->state==SITE_STOP) {
1088 /* In all other states we consider delivering the packet if we have
1089 a valid key and a valid address to send it to. */
1090 if (st->current_valid && transport_peers_valid(&st->peers)) {
1091 /* Transform it and send it */
1093 buf_prepend_uint32(buf,LABEL_MSG9);
1094 st->current_transform->forwards(st->current_transform->st,
1095 buf, &transform_err);
1096 buf_prepend_uint32(buf,LABEL_MSG0);
1097 buf_prepend_uint32(buf,st->index);
1098 buf_prepend_uint32(buf,st->remote_session_id);
1099 transport_xmit(st,&st->peers,buf,False);
1105 slog(st,LOG_DROP,"discarding outgoing packet of size %d",buf->size);
1107 initiate_key_setup(st,"outgoing packet");
1110 /* This function is called by the communication device to deliver
1111 packets from our peers. */
1112 static bool_t site_incoming(void *sst, struct buffer_if *buf,
1113 const struct comm_addr *source)
1115 struct site *st=sst;
1116 uint32_t dest=ntohl(*(uint32_t *)buf->start);
1119 /* It could be for any site - it should have LABEL_MSG1 and
1120 might have our name and our peer's name in it */
1121 if (buf->size<(st->setupsiglen+8+NONCELEN)) return False;
1122 if (memcmp(buf->start+8,st->setupsig,st->setupsiglen)==0) {
1123 /* It's addressed to us. Decide what to do about it. */
1124 dump_packet(st,buf,source,True);
1125 if (st->state==SITE_RUN || st->state==SITE_RESOLVE ||
1126 st->state==SITE_WAIT) {
1127 /* We should definitely process it */
1128 if (process_msg1(st,buf,source)) {
1129 slog(st,LOG_SETUP_INIT,"key setup initiated by peer");
1130 enter_new_state(st,SITE_SENTMSG2);
1132 slog(st,LOG_ERROR,"failed to process incoming msg1");
1136 } else if (st->state==SITE_SENTMSG1) {
1137 /* We've just sent a message 1! They may have crossed on
1138 the wire. If we have priority then we ignore the
1139 incoming one, otherwise we process it as usual. */
1140 if (st->setup_priority) {
1142 slog(st,LOG_DUMP,"crossed msg1s; we are higher "
1143 "priority => ignore incoming msg1");
1146 slog(st,LOG_DUMP,"crossed msg1s; we are lower "
1147 "priority => use incoming msg1");
1148 if (process_msg1(st,buf,source)) {
1149 BUF_FREE(&st->buffer); /* Free our old message 1 */
1150 enter_new_state(st,SITE_SENTMSG2);
1152 slog(st,LOG_ERROR,"failed to process an incoming "
1153 "crossed msg1 (we have low priority)");
1159 /* The message 1 was received at an unexpected stage of the
1160 key setup. XXX POLICY - what do we do? */
1161 slog(st,LOG_UNEXPECTED,"unexpected incoming message 1");
1165 return False; /* Not for us. */
1167 if (dest==st->index) {
1168 /* Explicitly addressed to us */
1169 uint32_t msgtype=ntohl(get_uint32(buf->start+8));
1170 if (msgtype!=LABEL_MSG0) dump_packet(st,buf,source,True);
1173 /* If the source is our current peer then initiate a key setup,
1174 because our peer's forgotten the key */
1175 if (get_uint32(buf->start+4)==st->remote_session_id) {
1176 initiate_key_setup(st,"received a NAK");
1178 slog(st,LOG_SEC,"bad incoming NAK");
1182 process_msg0(st,buf,source);
1185 /* Setup packet: should not have been explicitly addressed
1187 slog(st,LOG_SEC,"incoming explicitly addressed msg1");
1190 /* Setup packet: expected only in state SENTMSG1 */
1191 if (st->state!=SITE_SENTMSG1) {
1192 slog(st,LOG_UNEXPECTED,"unexpected MSG2");
1193 } else if (process_msg2(st,buf,source)) {
1194 transport_setup_msgok(st,source);
1195 enter_new_state(st,SITE_SENTMSG3);
1197 slog(st,LOG_SEC,"invalid MSG2");
1201 /* Setup packet: expected only in state SENTMSG2 */
1202 if (st->state!=SITE_SENTMSG2) {
1203 slog(st,LOG_UNEXPECTED,"unexpected MSG3");
1204 } else if (process_msg3(st,buf,source)) {
1205 transport_setup_msgok(st,source);
1206 enter_new_state(st,SITE_SENTMSG4);
1208 slog(st,LOG_SEC,"invalid MSG3");
1212 /* Setup packet: expected only in state SENTMSG3 */
1213 if (st->state!=SITE_SENTMSG3) {
1214 slog(st,LOG_UNEXPECTED,"unexpected MSG4");
1215 } else if (process_msg4(st,buf,source)) {
1216 transport_setup_msgok(st,source);
1217 enter_new_state(st,SITE_SENTMSG5);
1219 slog(st,LOG_SEC,"invalid MSG4");
1223 /* Setup packet: expected only in state SENTMSG4 */
1224 /* (may turn up in state RUN if our return MSG6 was lost
1225 and the new key has already been activated. In that
1226 case we should treat it as an ordinary PING packet. We
1227 can't pass it to process_msg5() because the
1228 new_transform will now be unkeyed. XXX) */
1229 if (st->state!=SITE_SENTMSG4) {
1230 slog(st,LOG_UNEXPECTED,"unexpected MSG5");
1231 } else if (process_msg5(st,buf,source)) {
1232 transport_setup_msgok(st,source);
1233 enter_new_state(st,SITE_RUN);
1235 slog(st,LOG_SEC,"invalid MSG5");
1239 /* Setup packet: expected only in state SENTMSG5 */
1240 if (st->state!=SITE_SENTMSG5) {
1241 slog(st,LOG_UNEXPECTED,"unexpected MSG6");
1242 } else if (process_msg6(st,buf,source)) {
1243 BUF_FREE(&st->buffer); /* Free message 5 */
1244 transport_setup_msgok(st,source);
1245 activate_new_key(st);
1247 slog(st,LOG_SEC,"invalid MSG6");
1251 slog(st,LOG_SEC,"received message of unknown type 0x%08x",
1262 static void site_control(void *vst, bool_t run)
1264 struct site *st=vst;
1265 if (run) enter_state_run(st);
1266 else enter_state_stop(st);
1269 static void site_phase_hook(void *sst, uint32_t newphase)
1271 struct site *st=sst;
1273 /* The program is shutting down; tell our peer */
1274 send_msg7(st,"shutting down");
1277 static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context,
1280 static uint32_t index_sequence;
1285 st=safe_malloc(sizeof(*st),"site_apply");
1287 st->cl.description="site";
1288 st->cl.type=CL_SITE;
1290 st->cl.interface=&st->ops;
1292 st->ops.control=site_control;
1293 st->ops.status=site_status;
1295 /* First parameter must be a dict */
1296 item=list_elem(args,0);
1297 if (!item || item->type!=t_dict)
1298 cfgfatal(loc,"site","parameter must be a dictionary\n");
1300 dict=item->data.dict;
1301 st->localname=dict_read_string(dict, "local-name", True, "site", loc);
1302 st->remotename=dict_read_string(dict, "name", True, "site", loc);
1303 /* Sanity check (which also allows the 'sites' file to include
1304 site() closures for all sites including our own): refuse to
1305 talk to ourselves */
1306 if (strcmp(st->localname,st->remotename)==0) {
1307 Message(M_DEBUG,"site %s: local-name==name -> ignoring this site\n",
1312 assert(index_sequence < 0xffffffffUL);
1313 st->index = ++index_sequence;
1314 st->peer_mobile=dict_read_bool(dict,"mobile",False,"site",loc,False);
1315 st->netlink=find_cl_if(dict,"link",CL_NETLINK,True,"site",loc);
1316 st->comm=find_cl_if(dict,"comm",CL_COMM,True,"site",loc);
1317 st->resolver=find_cl_if(dict,"resolver",CL_RESOLVER,True,"site",loc);
1318 st->log=find_cl_if(dict,"log",CL_LOG,True,"site",loc);
1319 st->random=find_cl_if(dict,"random",CL_RANDOMSRC,True,"site",loc);
1321 st->privkey=find_cl_if(dict,"local-key",CL_RSAPRIVKEY,True,"site",loc);
1322 st->address=dict_read_string(dict, "address", False, "site", loc);
1324 st->remoteport=dict_read_number(dict,"port",True,"site",loc,0);
1325 else st->remoteport=0;
1326 st->pubkey=find_cl_if(dict,"key",CL_RSAPUBKEY,True,"site",loc);
1329 find_cl_if(dict,"transform",CL_TRANSFORM,True,"site",loc);
1331 st->dh=find_cl_if(dict,"dh",CL_DH,True,"site",loc);
1332 st->hash=find_cl_if(dict,"hash",CL_HASH,True,"site",loc);
1334 #define DEFAULT(D) DEFAULT_##D
1335 #define CFG_NUMBER(k,D) dict_read_number(dict,(k),False,"site",loc,DEFAULT(D));
1337 st->key_lifetime= CFG_NUMBER("key-lifetime", KEY_LIFETIME);
1338 st->setup_retries= CFG_NUMBER("setup-retries", SETUP_RETRIES);
1339 st->setup_retry_interval= CFG_NUMBER("setup-timeout", SETUP_RETRY_INTERVAL);
1340 st->wait_timeout= CFG_NUMBER("wait-time", WAIT_TIME);
1342 st->mobile_peer_expiry= dict_read_number(
1343 dict,"mobile-peer-expiry",False,"site",loc,DEFAULT_MOBILE_PEER_EXPIRY);
1345 st->transport_peers_max= !st->peer_mobile ? 1 : dict_read_number(
1346 dict,"mobile-peers-max",False,"site",loc,DEFAULT_MOBILE_PEERS_MAX);
1347 if (st->transport_peers_max<1 ||
1348 st->transport_peers_max>=MAX_MOBILE_PEERS_MAX) {
1349 cfgfatal(loc,"site","mobile-peers-max must be in range 1.."
1350 STRING(MAX_MOBILE_PEERS_MAX) "\n");
1353 if (st->key_lifetime < DEFAULT(KEY_RENEGOTIATE_GAP)*2)
1354 st->key_renegotiate_time=st->key_lifetime/2;
1356 st->key_renegotiate_time=st->key_lifetime-DEFAULT(KEY_RENEGOTIATE_GAP);
1357 st->key_renegotiate_time=dict_read_number(
1358 dict,"renegotiate-time",False,"site",loc,st->key_renegotiate_time);
1359 if (st->key_renegotiate_time > st->key_lifetime) {
1360 cfgfatal(loc,"site",
1361 "renegotiate-time must be less than key-lifetime\n");
1364 st->log_events=string_list_to_word(dict_lookup(dict,"log-events"),
1365 log_event_table,"site");
1367 st->tunname=safe_malloc(strlen(st->localname)+strlen(st->remotename)+5,
1369 sprintf(st->tunname,"%s<->%s",st->localname,st->remotename);
1371 /* The information we expect to see in incoming messages of type 1 */
1372 /* fixme: lots of unchecked overflows here, but the results are only
1373 corrupted packets rather than undefined behaviour */
1374 st->setupsiglen=strlen(st->remotename)+strlen(st->localname)+8;
1375 st->setupsig=safe_malloc(st->setupsiglen,"site_apply");
1376 put_uint32(st->setupsig+0,LABEL_MSG1);
1377 put_uint16(st->setupsig+4,strlen(st->remotename));
1378 memcpy(&st->setupsig[6],st->remotename,strlen(st->remotename));
1379 put_uint16(st->setupsig+(6+strlen(st->remotename)),strlen(st->localname));
1380 memcpy(&st->setupsig[8+strlen(st->remotename)],st->localname,
1381 strlen(st->localname));
1382 st->setup_priority=(strcmp(st->localname,st->remotename)>0);
1384 buffer_new(&st->buffer,SETUP_BUFFER_LEN);
1386 /* We are interested in poll(), but only for timeouts. We don't have
1387 any fds of our own. */
1388 register_for_poll(st, site_beforepoll, site_afterpoll, 0, "site");
1391 st->current_valid=False;
1392 st->current_key_timeout=0;
1393 transport_peers_clear(st,&st->peers);
1394 transport_peers_clear(st,&st->setup_peers);
1395 /* XXX mlock these */
1396 st->dhsecret=safe_malloc(st->dh->len,"site:dhsecret");
1397 st->sharedsecret=safe_malloc(st->transform->keylen,"site:sharedsecret");
1399 /* We need to register the remote networks with the netlink device */
1400 st->netlink->reg(st->netlink->st, site_outgoing, st,
1401 st->transform->max_start_pad+(4*4)+
1402 st->comm->min_start_pad,
1403 st->transform->max_end_pad+st->comm->min_end_pad);
1405 st->comm->request_notify(st->comm->st, st, site_incoming);
1407 st->current_transform=st->transform->create(st->transform->st);
1408 st->new_transform=st->transform->create(st->transform->st);
1410 enter_state_stop(st);
1412 add_hook(PHASE_SHUTDOWN,site_phase_hook,st);
1414 return new_closure(&st->cl);
1417 void site_module(dict_t *dict)
1419 add_closure(dict,"site",site_apply);
1423 /***** TRANSPORT PEERS definitions *****/
1425 static void transport_peers_debug(struct site *st, transport_peers *dst,
1426 const char *didwhat,
1427 int nargs, const struct comm_addr *args,
1432 if (!(st->log_events & LOG_PEER_ADDRS))
1433 return; /* an optimisation */
1435 slog(st, LOG_PEER_ADDRS, "peers (%s) %s nargs=%d => npeers=%d",
1436 (dst==&st->peers ? "data" :
1437 dst==&st->setup_peers ? "setup" : "UNKNOWN"),
1438 didwhat, nargs, dst->npeers);
1440 for (i=0, argp=(void*)args;
1442 i++, (argp+=stride?stride:sizeof(*args))) {
1443 const struct comm_addr *ca=(void*)argp;
1444 slog(st, LOG_PEER_ADDRS, " args: addrs[%d]=%s",
1445 i, ca->comm->addr_to_string(ca->comm->st,ca));
1447 for (i=0; i<dst->npeers; i++) {
1448 struct timeval diff;
1449 timersub(tv_now,&dst->peers[i].last,&diff);
1450 const struct comm_addr *ca=&dst->peers[i].addr;
1451 slog(st, LOG_PEER_ADDRS, " peers: addrs[%d]=%s T-%ld.%06ld",
1452 i, ca->comm->addr_to_string(ca->comm->st,ca),
1453 (unsigned long)diff.tv_sec, (unsigned long)diff.tv_usec);
1457 static int transport_peer_compar(const void *av, const void *bv) {
1458 const transport_peer *a=av;
1459 const transport_peer *b=bv;
1460 /* put most recent first in the array */
1461 if (timercmp(&a->last, &b->last, <)) return +1;
1462 if (timercmp(&a->last, &b->last, >)) return -11;
1466 static void transport_peers_expire(struct site *st, transport_peers *peers) {
1467 /* peers must be sorted first */
1468 int previous_peers=peers->npeers;
1469 struct timeval oldest;
1470 oldest.tv_sec = tv_now->tv_sec - st->mobile_peer_expiry;
1471 oldest.tv_usec = tv_now->tv_usec;
1472 while (peers->npeers>1 &&
1473 timercmp(&peers->peers[peers->npeers-1].last, &oldest, <))
1475 if (peers->npeers != previous_peers)
1476 transport_peers_debug(st,peers,"expire", 0,0,0);
1479 static void transport_record_peer(struct site *st, transport_peers *peers,
1480 const struct comm_addr *addr, const char *m) {
1481 int slot, changed=0;
1483 for (slot=0; slot<peers->npeers; slot++)
1484 if (!memcmp(&peers->peers[slot].addr, addr, sizeof(*addr)))
1488 if (peers->npeers==st->transport_peers_max)
1489 slot=st->transport_peers_max;
1491 slot=peers->npeers++;
1494 peers->peers[slot].addr=*addr;
1495 peers->peers[slot].last=*tv_now;
1497 if (peers->npeers>1)
1498 qsort(peers->peers, peers->npeers,
1499 sizeof(*peers->peers), transport_peer_compar);
1501 if (changed || peers->npeers!=1)
1502 transport_peers_debug(st,peers,m, 1,addr,0);
1503 transport_peers_expire(st, peers);
1506 static bool_t transport_compute_setupinit_peers(struct site *st,
1507 const struct comm_addr *configured_addr /* 0 if none or not found */) {
1509 if (!configured_addr && !transport_peers_valid(&st->peers))
1512 slog(st,LOG_SETUP_INIT,
1513 (!configured_addr ? "using only %d old peer address(es)"
1514 : "using configured address, and/or perhaps %d old peer address(es)"),
1517 /* Non-mobile peers havve st->peers.npeers==0 or ==1, since they
1518 * have transport_peers_max==1. The effect is that this code
1519 * always uses the configured address if supplied, or otherwise
1520 * the existing data peer if one exists; this is as desired. */
1522 transport_peers_copy(st,&st->setup_peers,&st->peers);
1524 if (configured_addr)
1525 transport_record_peer(st,&st->setup_peers,configured_addr,"setupinit");
1527 assert(transport_peers_valid(&st->setup_peers));
1531 static void transport_setup_msgok(struct site *st, const struct comm_addr *a) {
1532 if (st->peer_mobile)
1533 transport_record_peer(st,&st->setup_peers,a,"setupmsg");
1535 static void transport_data_msgok(struct site *st, const struct comm_addr *a) {
1536 if (st->peer_mobile)
1537 transport_record_peer(st,&st->peers,a,"datamsg");
1540 static int transport_peers_valid(transport_peers *peers) {
1541 return peers->npeers;
1543 static void transport_peers_clear(struct site *st, transport_peers *peers) {
1545 transport_peers_debug(st,peers,"clear",0,0,0);
1547 static void transport_peers_copy(struct site *st, transport_peers *dst,
1548 const transport_peers *src) {
1549 dst->npeers=src->npeers;
1550 memcpy(dst->peers, src->peers, sizeof(*dst->peers) * dst->npeers);
1551 transport_peers_debug(st,dst,"copy",
1552 src->npeers, &src->peers->addr, sizeof(src->peers));
1555 void transport_xmit(struct site *st, transport_peers *peers,
1556 struct buffer_if *buf, bool_t candebug) {
1558 transport_peers_expire(st, peers);
1559 for (slot=0; slot<peers->npeers; slot++) {
1560 transport_peer *peer=&peers->peers[slot];
1562 dump_packet(st, buf, &peer->addr, False);
1563 peer->addr.comm->sendmsg(peer->addr.comm->st, buf, &peer->addr);
1567 /***** END of transport peers declarations *****/