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 *comm;
230 struct resolver_if *resolver;
232 struct random_if *random;
233 struct rsaprivkey_if *privkey;
234 struct rsapubkey_if *pubkey;
235 struct transform_if *transform;
237 struct hash_if *hash;
239 uint32_t index; /* Index of this site */
240 int32_t setup_retries; /* How many times to send setup packets */
241 int32_t setup_retry_interval; /* Initial timeout for setup packets */
242 int32_t wait_timeout; /* How long to wait if setup unsuccessful */
243 int32_t mobile_peer_expiry; /* How long to remember 2ary addresses */
244 int32_t key_lifetime; /* How long a key lasts once set up */
245 int32_t key_renegotiate_time; /* If we see traffic (or a keepalive)
246 after this time, initiate a new
249 uint8_t *setupsig; /* Expected signature of incoming MSG1 packets */
250 int32_t setupsiglen; /* Allows us to discard packets quickly if
251 they are not for us */
252 bool_t setup_priority; /* Do we have precedence if both sites emit
253 message 1 simultaneously? */
256 /* runtime information */
258 uint64_t now; /* Most recently seen time */
260 /* The currently established session */
261 uint32_t remote_session_id;
262 struct transform_inst_if *current_transform;
263 bool_t current_valid;
264 uint64_t current_key_timeout; /* End of life of current key */
265 uint64_t renegotiate_key_time; /* When we can negotiate a new key */
266 transport_peers peers; /* Current address(es) of peer for data traffic */
268 /* The current key setup protocol exchange. We can only be
269 involved in one of these at a time. There's a potential for
270 denial of service here (the attacker keeps sending a setup
271 packet; we keep trying to continue the exchange, and have to
272 timeout before we can listen for another setup packet); perhaps
273 we should keep a list of 'bad' sources for setup packets. */
274 uint32_t setup_session_id;
275 transport_peers setup_peers;
276 uint8_t localN[NONCELEN]; /* Nonces for key exchange */
277 uint8_t remoteN[NONCELEN];
278 struct buffer_if buffer; /* Current outgoing key exchange packet */
279 int32_t retries; /* Number of retries remaining */
280 uint64_t timeout; /* Timeout for current state */
282 uint8_t *sharedsecret;
283 struct transform_inst_if *new_transform; /* For key setup/verify */
286 static void slog(struct site *st, uint32_t event, cstring_t msg, ...)
294 if (event&st->log_events) {
296 case LOG_UNEXPECTED: class=M_INFO; break;
297 case LOG_SETUP_INIT: class=M_INFO; break;
298 case LOG_SETUP_TIMEOUT: class=M_NOTICE; break;
299 case LOG_ACTIVATE_KEY: class=M_INFO; break;
300 case LOG_TIMEOUT_KEY: class=M_INFO; break;
301 case LOG_SEC: class=M_SECURITY; break;
302 case LOG_STATE: class=M_DEBUG; break;
303 case LOG_DROP: class=M_DEBUG; break;
304 case LOG_DUMP: class=M_DEBUG; break;
305 case LOG_ERROR: class=M_ERR; break;
306 case LOG_PEER_ADDRS: class=M_DEBUG; break;
307 default: class=M_ERR; break;
310 vsnprintf(buf,sizeof(buf),msg,ap);
311 st->log->log(st->log->st,class,"%s: %s",st->tunname,buf);
316 static void set_link_quality(struct site *st);
317 static void delete_key(struct site *st, cstring_t reason, uint32_t loglevel);
318 static bool_t initiate_key_setup(struct site *st, cstring_t reason);
319 static void enter_state_run(struct site *st);
320 static bool_t enter_state_resolve(struct site *st);
321 static bool_t enter_new_state(struct site *st,uint32_t next);
322 static void enter_state_wait(struct site *st);
324 #define CHECK_AVAIL(b,l) do { if ((b)->size<(l)) return False; } while(0)
325 #define CHECK_EMPTY(b) do { if ((b)->size!=0) return False; } while(0)
326 #define CHECK_TYPE(b,t) do { uint32_t type; \
327 CHECK_AVAIL((b),4); \
328 type=buf_unprepend_uint32((b)); \
329 if (type!=(t)) return False; } while(0)
348 /* Build any of msg1 to msg4. msg5 and msg6 are built from the inside
349 out using a transform of config data supplied by netlink */
350 static bool_t generate_msg(struct site *st, uint32_t type, cstring_t what)
356 st->retries=st->setup_retries;
357 BUF_ALLOC(&st->buffer,what);
358 buffer_init(&st->buffer,0);
359 buf_append_uint32(&st->buffer,
360 (type==LABEL_MSG1?0:st->setup_session_id));
361 buf_append_uint32(&st->buffer,st->index);
362 buf_append_uint32(&st->buffer,type);
363 buf_append_string(&st->buffer,st->localname);
364 buf_append_string(&st->buffer,st->remotename);
365 memcpy(buf_append(&st->buffer,NONCELEN),st->localN,NONCELEN);
366 if (type==LABEL_MSG1) return True;
367 memcpy(buf_append(&st->buffer,NONCELEN),st->remoteN,NONCELEN);
368 if (type==LABEL_MSG2) return True;
370 if (hacky_par_mid_failnow()) return False;
372 dhpub=st->dh->makepublic(st->dh->st,st->dhsecret,st->dh->len);
373 buf_append_string(&st->buffer,dhpub);
375 hash=safe_malloc(st->hash->len, "generate_msg");
376 hst=st->hash->init();
377 st->hash->update(hst,st->buffer.start,st->buffer.size);
378 st->hash->final(hst,hash);
379 sig=st->privkey->sign(st->privkey->st,hash,st->hash->len);
380 buf_append_string(&st->buffer,sig);
386 static bool_t unpick_msg(struct site *st, uint32_t type,
387 struct buffer_if *msg, struct msg *m)
389 m->hashstart=msg->start;
391 m->dest=buf_unprepend_uint32(msg);
393 m->source=buf_unprepend_uint32(msg);
394 CHECK_TYPE(msg,type);
396 m->remlen=buf_unprepend_uint16(msg);
397 CHECK_AVAIL(msg,m->remlen);
398 m->remote=buf_unprepend(msg,m->remlen);
400 m->loclen=buf_unprepend_uint16(msg);
401 CHECK_AVAIL(msg,m->loclen);
402 m->local=buf_unprepend(msg,m->loclen);
403 CHECK_AVAIL(msg,NONCELEN);
404 m->nR=buf_unprepend(msg,NONCELEN);
405 if (type==LABEL_MSG1) {
409 CHECK_AVAIL(msg,NONCELEN);
410 m->nL=buf_unprepend(msg,NONCELEN);
411 if (type==LABEL_MSG2) {
416 m->pklen=buf_unprepend_uint16(msg);
417 CHECK_AVAIL(msg,m->pklen);
418 m->pk=buf_unprepend(msg,m->pklen);
419 m->hashlen=msg->start-m->hashstart;
421 m->siglen=buf_unprepend_uint16(msg);
422 CHECK_AVAIL(msg,m->siglen);
423 m->sig=buf_unprepend(msg,m->siglen);
428 static bool_t check_msg(struct site *st, uint32_t type, struct msg *m,
431 if (type==LABEL_MSG1) return True;
433 /* Check that the site names and our nonce have been sent
434 back correctly, and then store our peer's nonce. */
435 if (memcmp(m->remote,st->remotename,strlen(st->remotename)!=0)) {
436 *error="wrong remote site name";
439 if (memcmp(m->local,st->localname,strlen(st->localname)!=0)) {
440 *error="wrong local site name";
443 if (memcmp(m->nL,st->localN,NONCELEN)!=0) {
444 *error="wrong locally-generated nonce";
447 if (type==LABEL_MSG2) return True;
448 if (memcmp(m->nR,st->remoteN,NONCELEN)!=0) {
449 *error="wrong remotely-generated nonce";
452 if (type==LABEL_MSG3) return True;
453 if (type==LABEL_MSG4) return True;
454 *error="unknown message type";
458 static bool_t generate_msg1(struct site *st)
460 st->random->generate(st->random->st,NONCELEN,st->localN);
461 return generate_msg(st,LABEL_MSG1,"site:MSG1");
464 static bool_t process_msg1(struct site *st, struct buffer_if *msg1,
465 const struct comm_addr *src)
469 /* We've already determined we're in an appropriate state to
470 process an incoming MSG1, and that the MSG1 has correct values
473 if (!unpick_msg(st,LABEL_MSG1,msg1,&m)) return False;
475 transport_record_peer(st,&st->setup_peers,src,"msg1");
476 st->setup_session_id=m.source;
477 memcpy(st->remoteN,m.nR,NONCELEN);
481 static bool_t generate_msg2(struct site *st)
483 st->random->generate(st->random->st,NONCELEN,st->localN);
484 return generate_msg(st,LABEL_MSG2,"site:MSG2");
487 static bool_t process_msg2(struct site *st, struct buffer_if *msg2,
488 const struct comm_addr *src)
493 if (!unpick_msg(st,LABEL_MSG2,msg2,&m)) return False;
494 if (!check_msg(st,LABEL_MSG2,&m,&err)) {
495 slog(st,LOG_SEC,"msg2: %s",err);
498 st->setup_session_id=m.source;
499 memcpy(st->remoteN,m.nR,NONCELEN);
503 static bool_t generate_msg3(struct site *st)
505 /* Now we have our nonce and their nonce. Think of a secret key,
506 and create message number 3. */
507 st->random->generate(st->random->st,st->dh->len,st->dhsecret);
508 return generate_msg(st,LABEL_MSG3,"site:MSG3");
511 static bool_t process_msg3(struct site *st, struct buffer_if *msg3,
512 const struct comm_addr *src)
519 if (!unpick_msg(st,LABEL_MSG3,msg3,&m)) return False;
520 if (!check_msg(st,LABEL_MSG3,&m,&err)) {
521 slog(st,LOG_SEC,"msg3: %s",err);
525 /* Check signature and store g^x mod m */
526 hash=safe_malloc(st->hash->len, "process_msg3");
527 hst=st->hash->init();
528 st->hash->update(hst,m.hashstart,m.hashlen);
529 st->hash->final(hst,hash);
530 /* Terminate signature with a '0' - cheating, but should be ok */
532 if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) {
533 slog(st,LOG_SEC,"msg3 signature failed check!");
539 /* Terminate their DH public key with a '0' */
541 /* Invent our DH secret key */
542 st->random->generate(st->random->st,st->dh->len,st->dhsecret);
544 /* Generate the shared key */
545 st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk,
546 st->sharedsecret,st->transform->keylen);
548 /* Set up the transform */
549 st->new_transform->setkey(st->new_transform->st,st->sharedsecret,
550 st->transform->keylen);
555 static bool_t generate_msg4(struct site *st)
557 /* We have both nonces, their public key and our private key. Generate
558 our public key, sign it and send it to them. */
559 return generate_msg(st,LABEL_MSG4,"site:MSG4");
562 static bool_t process_msg4(struct site *st, struct buffer_if *msg4,
563 const struct comm_addr *src)
570 if (!unpick_msg(st,LABEL_MSG4,msg4,&m)) return False;
571 if (!check_msg(st,LABEL_MSG4,&m,&err)) {
572 slog(st,LOG_SEC,"msg4: %s",err);
576 /* Check signature and store g^x mod m */
577 hash=safe_malloc(st->hash->len, "process_msg4");
578 hst=st->hash->init();
579 st->hash->update(hst,m.hashstart,m.hashlen);
580 st->hash->final(hst,hash);
581 /* Terminate signature with a '0' - cheating, but should be ok */
583 if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) {
584 slog(st,LOG_SEC,"msg4 signature failed check!");
590 /* Terminate their DH public key with a '0' */
592 /* Generate the shared key */
593 st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk,
594 st->sharedsecret,st->transform->keylen);
595 /* Set up the transform */
596 st->new_transform->setkey(st->new_transform->st,st->sharedsecret,
597 st->transform->keylen);
608 static bool_t unpick_msg0(struct site *st, struct buffer_if *msg0,
612 m->dest=buf_unprepend_uint32(msg0);
614 m->source=buf_unprepend_uint32(msg0);
616 m->type=buf_unprepend_uint32(msg0);
618 /* Leaves transformed part of buffer untouched */
621 static bool_t generate_msg5(struct site *st)
623 cstring_t transform_err;
625 BUF_ALLOC(&st->buffer,"site:MSG5");
626 /* We are going to add four words to the message */
627 buffer_init(&st->buffer,st->transform->max_start_pad+(4*4));
628 /* Give the netlink code an opportunity to put its own stuff in the
629 message (configuration information, etc.) */
630 st->netlink->output_config(st->netlink->st,&st->buffer);
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 if (!st->netlink->check_config(st->netlink->st,msg5)) {
663 slog(st,LOG_SEC,"MSG5/PING packet contained bad netlink config");
670 static bool_t generate_msg6(struct site *st)
672 cstring_t transform_err;
674 BUF_ALLOC(&st->buffer,"site:MSG6");
675 /* We are going to add four words to the message */
676 buffer_init(&st->buffer,st->transform->max_start_pad+(4*4));
677 /* Give the netlink code an opportunity to put its own stuff in the
678 message (configuration information, etc.) */
679 st->netlink->output_config(st->netlink->st,&st->buffer);
680 buf_prepend_uint32(&st->buffer,LABEL_MSG6);
681 st->new_transform->forwards(st->new_transform->st,&st->buffer,
683 buf_prepend_uint32(&st->buffer,LABEL_MSG6);
684 buf_prepend_uint32(&st->buffer,st->index);
685 buf_prepend_uint32(&st->buffer,st->setup_session_id);
687 st->retries=1; /* Peer will retransmit MSG5 if this packet gets lost */
691 static bool_t process_msg6(struct site *st, struct buffer_if *msg6,
692 const struct comm_addr *src)
695 cstring_t transform_err;
697 if (!unpick_msg0(st,msg6,&m)) return False;
699 if (st->new_transform->reverse(st->new_transform->st,
700 msg6,&transform_err)) {
701 /* There's a problem */
702 slog(st,LOG_SEC,"process_msg6: transform: %s",transform_err);
705 /* Buffer should now contain untransformed PING packet data */
707 if (buf_unprepend_uint32(msg6)!=LABEL_MSG6) {
708 slog(st,LOG_SEC,"MSG6/PONG packet contained invalid data");
711 if (!st->netlink->check_config(st->netlink->st,msg6)) {
712 slog(st,LOG_SEC,"MSG6/PONG packet contained bad netlink config");
719 static bool_t process_msg0(struct site *st, struct buffer_if *msg0,
720 const struct comm_addr *src)
723 cstring_t transform_err;
726 if (!st->current_valid) {
727 slog(st,LOG_DROP,"incoming message but no current key -> dropping");
728 return initiate_key_setup(st,"incoming message but no current key");
731 if (!unpick_msg0(st,msg0,&m)) return False;
733 if (st->current_transform->reverse(st->current_transform->st,
734 msg0,&transform_err)) {
735 /* There's a problem */
736 slog(st,LOG_SEC,"transform: %s",transform_err);
737 return initiate_key_setup(st,"incoming message would not decrypt");
740 type=buf_unprepend_uint32(msg0);
743 /* We must forget about the current session. */
744 delete_key(st,"request from peer",LOG_SEC);
747 /* Deliver to netlink layer */
748 st->netlink->deliver(st->netlink->st,msg0);
749 transport_data_msgok(st,src);
750 /* See whether we should start negotiating a new key */
751 if (st->now > st->renegotiate_key_time)
752 initiate_key_setup(st,"incoming packet in renegotiation window");
755 slog(st,LOG_SEC,"incoming encrypted message of type %08x "
762 static void dump_packet(struct site *st, struct buffer_if *buf,
763 const struct comm_addr *addr, bool_t incoming)
765 uint32_t dest=ntohl(*(uint32_t *)buf->start);
766 uint32_t source=ntohl(*(uint32_t *)(buf->start+4));
767 uint32_t msgtype=ntohl(*(uint32_t *)(buf->start+8));
769 if (st->log_events & LOG_DUMP)
770 slilog(st->log,M_DEBUG,"%s: %s: %08x<-%08x: %08x:",
771 st->tunname,incoming?"incoming":"outgoing",
772 dest,source,msgtype);
775 static uint32_t site_status(void *st)
780 static bool_t send_msg(struct site *st)
783 transport_xmit(st, &st->setup_peers, &st->buffer, True);
784 st->timeout=st->now+st->setup_retry_interval;
788 slog(st,LOG_SETUP_TIMEOUT,"timed out sending key setup packet "
789 "(in state %s)",state_name(st->state));
790 enter_state_wait(st);
795 static void site_resolve_callback(void *sst, struct in_addr *address)
798 struct comm_addr ca_buf, *ca_use;
800 if (st->state!=SITE_RESOLVE) {
801 slog(st,LOG_UNEXPECTED,"site_resolve_callback called unexpectedly");
806 ca_buf.comm=st->comm;
807 ca_buf.sin.sin_family=AF_INET;
808 ca_buf.sin.sin_port=htons(st->remoteport);
809 ca_buf.sin.sin_addr=*address;
812 slog(st,LOG_ERROR,"resolution of %s failed",st->address);
815 if (transport_compute_setupinit_peers(st,ca_use)) {
816 enter_new_state(st,SITE_SENTMSG1);
818 /* Can't figure out who to try to to talk to */
819 slog(st,LOG_SETUP_INIT,"key exchange failed: cannot find peer address");
824 static bool_t initiate_key_setup(struct site *st, cstring_t reason)
826 if (st->state!=SITE_RUN) return False;
827 slog(st,LOG_SETUP_INIT,"initiating key exchange (%s)",reason);
829 slog(st,LOG_SETUP_INIT,"resolving peer address");
830 return enter_state_resolve(st);
831 } else if (transport_compute_setupinit_peers(st,0)) {
832 return enter_new_state(st,SITE_SENTMSG1);
834 slog(st,LOG_SETUP_INIT,"key exchange failed: no address for peer");
838 static void activate_new_key(struct site *st)
840 struct transform_inst_if *t;
842 /* We have two transform instances, which we swap between active
844 t=st->current_transform;
845 st->current_transform=st->new_transform;
850 st->current_valid=True;
851 st->current_key_timeout=st->now+st->key_lifetime;
852 st->renegotiate_key_time=st->now+st->key_renegotiate_time;
853 transport_peers_copy(st,&st->peers,&st->setup_peers);
854 st->remote_session_id=st->setup_session_id;
856 slog(st,LOG_ACTIVATE_KEY,"new key activated");
860 static void delete_key(struct site *st, cstring_t reason, uint32_t loglevel)
862 if (st->current_valid) {
863 slog(st,loglevel,"session closed (%s)",reason);
865 st->current_valid=False;
866 st->current_transform->delkey(st->current_transform->st);
867 st->current_key_timeout=0;
868 set_link_quality(st);
872 static void state_assert(struct site *st, bool_t ok)
874 if (!ok) fatal("site:state_assert");
877 static void enter_state_stop(struct site *st)
881 delete_key(st,"entering state STOP",LOG_TIMEOUT_KEY);
882 st->new_transform->delkey(st->new_transform->st);
885 static void set_link_quality(struct site *st)
888 if (st->current_valid)
889 quality=LINK_QUALITY_UP;
890 else if (st->state==SITE_WAIT || st->state==SITE_STOP)
891 quality=LINK_QUALITY_DOWN;
892 else if (st->address)
893 quality=LINK_QUALITY_DOWN_CURRENT_ADDRESS;
894 else if (transport_peers_valid(&st->peers))
895 quality=LINK_QUALITY_DOWN_STALE_ADDRESS;
897 quality=LINK_QUALITY_DOWN;
899 st->netlink->set_quality(st->netlink->st,quality);
902 static void enter_state_run(struct site *st)
904 slog(st,LOG_STATE,"entering state RUN");
908 st->setup_session_id=0;
909 transport_peers_clear(st,&st->setup_peers);
910 memset(st->localN,0,NONCELEN);
911 memset(st->remoteN,0,NONCELEN);
912 st->new_transform->delkey(st->new_transform->st);
913 memset(st->dhsecret,0,st->dh->len);
914 memset(st->sharedsecret,0,st->transform->keylen);
915 set_link_quality(st);
918 static bool_t enter_state_resolve(struct site *st)
920 state_assert(st,st->state==SITE_RUN);
921 slog(st,LOG_STATE,"entering state RESOLVE");
922 st->state=SITE_RESOLVE;
923 st->resolver->request(st->resolver->st,st->address,
924 site_resolve_callback,st);
928 static bool_t enter_new_state(struct site *st, uint32_t next)
930 bool_t (*gen)(struct site *st);
933 slog(st,LOG_STATE,"entering state %s",state_name(next));
936 state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE);
940 state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE ||
941 st->state==SITE_SENTMSG1 || st->state==SITE_WAIT);
945 state_assert(st,st->state==SITE_SENTMSG1);
946 BUF_FREE(&st->buffer);
950 state_assert(st,st->state==SITE_SENTMSG2);
951 BUF_FREE(&st->buffer);
955 state_assert(st,st->state==SITE_SENTMSG3);
956 BUF_FREE(&st->buffer);
960 state_assert(st,st->state==SITE_SENTMSG4);
961 BUF_FREE(&st->buffer);
966 fatal("enter_new_state(%s): invalid new state",state_name(next));
970 if (hacky_par_start_failnow()) return False;
972 r= gen(st) && send_msg(st);
975 st->setup_retries, st->setup_retry_interval,
980 if (next==SITE_RUN) {
981 BUF_FREE(&st->buffer); /* Never reused */
982 st->timeout=0; /* Never retransmit */
983 activate_new_key(st);
987 slog(st,LOG_ERROR,"error entering state %s",state_name(next));
988 st->buffer.free=False; /* Unconditionally use the buffer; it may be
989 in either state, and enter_state_wait() will
991 enter_state_wait(st);
995 /* msg7 tells our peer that we're about to forget our key */
996 static bool_t send_msg7(struct site *st, cstring_t reason)
998 cstring_t transform_err;
1000 if (st->current_valid && st->buffer.free
1001 && transport_peers_valid(&st->peers)) {
1002 BUF_ALLOC(&st->buffer,"site:MSG7");
1003 buffer_init(&st->buffer,st->transform->max_start_pad+(4*3));
1004 buf_append_uint32(&st->buffer,LABEL_MSG7);
1005 buf_append_string(&st->buffer,reason);
1006 st->current_transform->forwards(st->current_transform->st,
1007 &st->buffer, &transform_err);
1008 buf_prepend_uint32(&st->buffer,LABEL_MSG0);
1009 buf_prepend_uint32(&st->buffer,st->index);
1010 buf_prepend_uint32(&st->buffer,st->remote_session_id);
1011 transport_xmit(st,&st->peers,&st->buffer,True);
1012 BUF_FREE(&st->buffer);
1018 /* We go into this state if our peer becomes uncommunicative. Similar to
1019 the "stop" state, we forget all session keys for a while, before
1020 re-entering the "run" state. */
1021 static void enter_state_wait(struct site *st)
1023 slog(st,LOG_STATE,"entering state WAIT");
1024 st->timeout=st->now+st->wait_timeout;
1025 st->state=SITE_WAIT;
1026 set_link_quality(st);
1027 BUF_FREE(&st->buffer); /* will have had an outgoing packet in it */
1028 /* XXX Erase keys etc. */
1031 static inline void site_settimeout(uint64_t timeout, int *timeout_io)
1034 int64_t offset=timeout-*now;
1035 if (offset<0) offset=0;
1036 if (offset>INT_MAX) offset=INT_MAX;
1037 if (*timeout_io<0 || offset<*timeout_io)
1042 static int site_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
1045 struct site *st=sst;
1047 *nfds_io=0; /* We don't use any file descriptors */
1050 /* Work out when our next timeout is. The earlier of 'timeout' or
1051 'current_key_timeout'. A stored value of '0' indicates no timeout
1053 site_settimeout(st->timeout, timeout_io);
1054 site_settimeout(st->current_key_timeout, timeout_io);
1056 return 0; /* success */
1059 /* NB site_afterpoll will be called before site_beforepoll is ever called */
1060 static void site_afterpoll(void *sst, struct pollfd *fds, int nfds)
1062 struct site *st=sst;
1065 if (st->timeout && *now>st->timeout) {
1067 if (st->state>=SITE_SENTMSG1 && st->state<=SITE_SENTMSG5) {
1068 if (!hacky_par_start_failnow())
1070 } else if (st->state==SITE_WAIT) {
1071 enter_state_run(st);
1073 slog(st,LOG_ERROR,"site_afterpoll: unexpected timeout, state=%d",
1077 if (st->current_key_timeout && *now>st->current_key_timeout) {
1078 delete_key(st,"maximum key life exceeded",LOG_TIMEOUT_KEY);
1082 /* This function is called by the netlink device to deliver packets
1083 intended for the remote network. The packet is in "raw" wire
1084 format, but is guaranteed to be word-aligned. */
1085 static void site_outgoing(void *sst, struct buffer_if *buf)
1087 struct site *st=sst;
1088 cstring_t transform_err;
1090 if (st->state==SITE_STOP) {
1095 /* In all other states we consider delivering the packet if we have
1096 a valid key and a valid address to send it to. */
1097 if (st->current_valid && transport_peers_valid(&st->peers)) {
1098 /* Transform it and send it */
1100 buf_prepend_uint32(buf,LABEL_MSG9);
1101 st->current_transform->forwards(st->current_transform->st,
1102 buf, &transform_err);
1103 buf_prepend_uint32(buf,LABEL_MSG0);
1104 buf_prepend_uint32(buf,st->index);
1105 buf_prepend_uint32(buf,st->remote_session_id);
1106 transport_xmit(st,&st->peers,buf,False);
1112 slog(st,LOG_DROP,"discarding outgoing packet of size %d",buf->size);
1114 initiate_key_setup(st,"outgoing packet");
1117 /* This function is called by the communication device to deliver
1118 packets from our peers. */
1119 static bool_t site_incoming(void *sst, struct buffer_if *buf,
1120 const struct comm_addr *source)
1122 struct site *st=sst;
1123 uint32_t dest=ntohl(*(uint32_t *)buf->start);
1126 /* It could be for any site - it should have LABEL_MSG1 and
1127 might have our name and our peer's name in it */
1128 if (buf->size<(st->setupsiglen+8+NONCELEN)) return False;
1129 if (memcmp(buf->start+8,st->setupsig,st->setupsiglen)==0) {
1130 /* It's addressed to us. Decide what to do about it. */
1131 dump_packet(st,buf,source,True);
1132 if (st->state==SITE_RUN || st->state==SITE_RESOLVE ||
1133 st->state==SITE_WAIT) {
1134 /* We should definitely process it */
1135 if (process_msg1(st,buf,source)) {
1136 slog(st,LOG_SETUP_INIT,"key setup initiated by peer");
1137 enter_new_state(st,SITE_SENTMSG2);
1139 slog(st,LOG_ERROR,"failed to process incoming msg1");
1143 } else if (st->state==SITE_SENTMSG1) {
1144 /* We've just sent a message 1! They may have crossed on
1145 the wire. If we have priority then we ignore the
1146 incoming one, otherwise we process it as usual. */
1147 if (st->setup_priority) {
1149 slog(st,LOG_DUMP,"crossed msg1s; we are higher "
1150 "priority => ignore incoming msg1");
1153 slog(st,LOG_DUMP,"crossed msg1s; we are lower "
1154 "priority => use incoming msg1");
1155 if (process_msg1(st,buf,source)) {
1156 BUF_FREE(&st->buffer); /* Free our old message 1 */
1157 enter_new_state(st,SITE_SENTMSG2);
1159 slog(st,LOG_ERROR,"failed to process an incoming "
1160 "crossed msg1 (we have low priority)");
1166 /* The message 1 was received at an unexpected stage of the
1167 key setup. XXX POLICY - what do we do? */
1168 slog(st,LOG_UNEXPECTED,"unexpected incoming message 1");
1172 return False; /* Not for us. */
1174 if (dest==st->index) {
1175 /* Explicitly addressed to us */
1176 uint32_t msgtype=ntohl(get_uint32(buf->start+8));
1177 if (msgtype!=LABEL_MSG0) dump_packet(st,buf,source,True);
1180 /* If the source is our current peer then initiate a key setup,
1181 because our peer's forgotten the key */
1182 if (get_uint32(buf->start+4)==st->remote_session_id) {
1183 initiate_key_setup(st,"received a NAK");
1185 slog(st,LOG_SEC,"bad incoming NAK");
1189 process_msg0(st,buf,source);
1192 /* Setup packet: should not have been explicitly addressed
1194 slog(st,LOG_SEC,"incoming explicitly addressed msg1");
1197 /* Setup packet: expected only in state SENTMSG1 */
1198 if (st->state!=SITE_SENTMSG1) {
1199 slog(st,LOG_UNEXPECTED,"unexpected MSG2");
1200 } else if (process_msg2(st,buf,source)) {
1201 transport_setup_msgok(st,source);
1202 enter_new_state(st,SITE_SENTMSG3);
1204 slog(st,LOG_SEC,"invalid MSG2");
1208 /* Setup packet: expected only in state SENTMSG2 */
1209 if (st->state!=SITE_SENTMSG2) {
1210 slog(st,LOG_UNEXPECTED,"unexpected MSG3");
1211 } else if (process_msg3(st,buf,source)) {
1212 transport_setup_msgok(st,source);
1213 enter_new_state(st,SITE_SENTMSG4);
1215 slog(st,LOG_SEC,"invalid MSG3");
1219 /* Setup packet: expected only in state SENTMSG3 */
1220 if (st->state!=SITE_SENTMSG3) {
1221 slog(st,LOG_UNEXPECTED,"unexpected MSG4");
1222 } else if (process_msg4(st,buf,source)) {
1223 transport_setup_msgok(st,source);
1224 enter_new_state(st,SITE_SENTMSG5);
1226 slog(st,LOG_SEC,"invalid MSG4");
1230 /* Setup packet: expected only in state SENTMSG4 */
1231 /* (may turn up in state RUN if our return MSG6 was lost
1232 and the new key has already been activated. In that
1233 case we should treat it as an ordinary PING packet. We
1234 can't pass it to process_msg5() because the
1235 new_transform will now be unkeyed. XXX) */
1236 if (st->state!=SITE_SENTMSG4) {
1237 slog(st,LOG_UNEXPECTED,"unexpected MSG5");
1238 } else if (process_msg5(st,buf,source)) {
1239 transport_setup_msgok(st,source);
1240 enter_new_state(st,SITE_RUN);
1242 slog(st,LOG_SEC,"invalid MSG5");
1246 /* Setup packet: expected only in state SENTMSG5 */
1247 if (st->state!=SITE_SENTMSG5) {
1248 slog(st,LOG_UNEXPECTED,"unexpected MSG6");
1249 } else if (process_msg6(st,buf,source)) {
1250 BUF_FREE(&st->buffer); /* Free message 5 */
1251 transport_setup_msgok(st,source);
1252 activate_new_key(st);
1254 slog(st,LOG_SEC,"invalid MSG6");
1258 slog(st,LOG_SEC,"received message of unknown type 0x%08x",
1269 static void site_control(void *vst, bool_t run)
1271 struct site *st=vst;
1272 if (run) enter_state_run(st);
1273 else enter_state_stop(st);
1276 static void site_phase_hook(void *sst, uint32_t newphase)
1278 struct site *st=sst;
1280 /* The program is shutting down; tell our peer */
1281 send_msg7(st,"shutting down");
1284 static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context,
1287 static uint32_t index_sequence;
1292 st=safe_malloc(sizeof(*st),"site_apply");
1294 st->cl.description="site";
1295 st->cl.type=CL_SITE;
1297 st->cl.interface=&st->ops;
1299 st->ops.control=site_control;
1300 st->ops.status=site_status;
1302 /* First parameter must be a dict */
1303 item=list_elem(args,0);
1304 if (!item || item->type!=t_dict)
1305 cfgfatal(loc,"site","parameter must be a dictionary\n");
1307 dict=item->data.dict;
1308 st->localname=dict_read_string(dict, "local-name", True, "site", loc);
1309 st->remotename=dict_read_string(dict, "name", True, "site", loc);
1311 st->peer_mobile=dict_read_bool(dict,"mobile",False,"site",loc,False);
1312 bool_t local_mobile=
1313 dict_read_bool(dict,"local-mobile",False,"site",loc,False);
1315 /* Sanity check (which also allows the 'sites' file to include
1316 site() closures for all sites including our own): refuse to
1317 talk to ourselves */
1318 if (strcmp(st->localname,st->remotename)==0) {
1319 Message(M_DEBUG,"site %s: local-name==name -> ignoring this site\n",
1321 if (st->peer_mobile != local_mobile)
1322 cfgfatal(loc,"site","site %s's peer-mobile=%d"
1323 " but our local-mobile=%d\n",
1324 st->localname, st->peer_mobile, local_mobile);
1328 if (st->peer_mobile && local_mobile) {
1329 Message(M_WARNING,"site %s: site is mobile but so are we"
1330 " -> ignoring this site\n", st->remotename);
1335 assert(index_sequence < 0xffffffffUL);
1336 st->index = ++index_sequence;
1337 st->netlink=find_cl_if(dict,"link",CL_NETLINK,True,"site",loc);
1338 st->comm=find_cl_if(dict,"comm",CL_COMM,True,"site",loc);
1339 st->resolver=find_cl_if(dict,"resolver",CL_RESOLVER,True,"site",loc);
1340 st->log=find_cl_if(dict,"log",CL_LOG,True,"site",loc);
1341 st->random=find_cl_if(dict,"random",CL_RANDOMSRC,True,"site",loc);
1343 st->privkey=find_cl_if(dict,"local-key",CL_RSAPRIVKEY,True,"site",loc);
1344 st->address=dict_read_string(dict, "address", False, "site", loc);
1346 st->remoteport=dict_read_number(dict,"port",True,"site",loc,0);
1347 else st->remoteport=0;
1348 st->pubkey=find_cl_if(dict,"key",CL_RSAPUBKEY,True,"site",loc);
1351 find_cl_if(dict,"transform",CL_TRANSFORM,True,"site",loc);
1353 st->dh=find_cl_if(dict,"dh",CL_DH,True,"site",loc);
1354 st->hash=find_cl_if(dict,"hash",CL_HASH,True,"site",loc);
1356 #define DEFAULT(D) (st->peer_mobile || local_mobile \
1357 ? DEFAULT_MOBILE_##D : DEFAULT_##D)
1358 #define CFG_NUMBER(k,D) dict_read_number(dict,(k),False,"site",loc,DEFAULT(D));
1360 st->key_lifetime= CFG_NUMBER("key-lifetime", KEY_LIFETIME);
1361 st->setup_retries= CFG_NUMBER("setup-retries", SETUP_RETRIES);
1362 st->setup_retry_interval= CFG_NUMBER("setup-timeout", SETUP_RETRY_INTERVAL);
1363 st->wait_timeout= CFG_NUMBER("wait-time", WAIT_TIME);
1365 st->mobile_peer_expiry= dict_read_number(
1366 dict,"mobile-peer-expiry",False,"site",loc,DEFAULT_MOBILE_PEER_EXPIRY);
1368 st->transport_peers_max= !st->peer_mobile ? 1 : dict_read_number(
1369 dict,"mobile-peers-max",False,"site",loc,DEFAULT_MOBILE_PEERS_MAX);
1370 if (st->transport_peers_max<1 ||
1371 st->transport_peers_max>=MAX_MOBILE_PEERS_MAX) {
1372 cfgfatal(loc,"site","mobile-peers-max must be in range 1.."
1373 STRING(MAX_MOBILE_PEERS_MAX) "\n");
1376 if (st->key_lifetime < DEFAULT(KEY_RENEGOTIATE_GAP)*2)
1377 st->key_renegotiate_time=st->key_lifetime/2;
1379 st->key_renegotiate_time=st->key_lifetime-DEFAULT(KEY_RENEGOTIATE_GAP);
1380 st->key_renegotiate_time=dict_read_number(
1381 dict,"renegotiate-time",False,"site",loc,st->key_renegotiate_time);
1382 if (st->key_renegotiate_time > st->key_lifetime) {
1383 cfgfatal(loc,"site",
1384 "renegotiate-time must be less than key-lifetime\n");
1387 st->log_events=string_list_to_word(dict_lookup(dict,"log-events"),
1388 log_event_table,"site");
1390 st->tunname=safe_malloc(strlen(st->localname)+strlen(st->remotename)+5,
1392 sprintf(st->tunname,"%s<->%s",st->localname,st->remotename);
1394 /* The information we expect to see in incoming messages of type 1 */
1395 /* fixme: lots of unchecked overflows here, but the results are only
1396 corrupted packets rather than undefined behaviour */
1397 st->setupsiglen=strlen(st->remotename)+strlen(st->localname)+8;
1398 st->setupsig=safe_malloc(st->setupsiglen,"site_apply");
1399 put_uint32(st->setupsig+0,LABEL_MSG1);
1400 put_uint16(st->setupsig+4,strlen(st->remotename));
1401 memcpy(&st->setupsig[6],st->remotename,strlen(st->remotename));
1402 put_uint16(st->setupsig+(6+strlen(st->remotename)),strlen(st->localname));
1403 memcpy(&st->setupsig[8+strlen(st->remotename)],st->localname,
1404 strlen(st->localname));
1405 st->setup_priority=(strcmp(st->localname,st->remotename)>0);
1407 buffer_new(&st->buffer,SETUP_BUFFER_LEN);
1409 /* We are interested in poll(), but only for timeouts. We don't have
1410 any fds of our own. */
1411 register_for_poll(st, site_beforepoll, site_afterpoll, 0, "site");
1414 st->current_valid=False;
1415 st->current_key_timeout=0;
1416 transport_peers_clear(st,&st->peers);
1417 transport_peers_clear(st,&st->setup_peers);
1418 /* XXX mlock these */
1419 st->dhsecret=safe_malloc(st->dh->len,"site:dhsecret");
1420 st->sharedsecret=safe_malloc(st->transform->keylen,"site:sharedsecret");
1422 /* We need to register the remote networks with the netlink device */
1423 st->netlink->reg(st->netlink->st, site_outgoing, st,
1424 st->transform->max_start_pad+(4*4)+
1425 st->comm->min_start_pad,
1426 st->transform->max_end_pad+st->comm->min_end_pad);
1428 st->comm->request_notify(st->comm->st, st, site_incoming);
1430 st->current_transform=st->transform->create(st->transform->st);
1431 st->new_transform=st->transform->create(st->transform->st);
1433 enter_state_stop(st);
1435 add_hook(PHASE_SHUTDOWN,site_phase_hook,st);
1437 return new_closure(&st->cl);
1440 void site_module(dict_t *dict)
1442 add_closure(dict,"site",site_apply);
1446 /***** TRANSPORT PEERS definitions *****/
1448 static void transport_peers_debug(struct site *st, transport_peers *dst,
1449 const char *didwhat,
1450 int nargs, const struct comm_addr *args,
1455 if (!(st->log_events & LOG_PEER_ADDRS))
1456 return; /* an optimisation */
1458 slog(st, LOG_PEER_ADDRS, "peers (%s) %s nargs=%d => npeers=%d",
1459 (dst==&st->peers ? "data" :
1460 dst==&st->setup_peers ? "setup" : "UNKNOWN"),
1461 didwhat, nargs, dst->npeers);
1463 for (i=0, argp=(void*)args;
1465 i++, (argp+=stride?stride:sizeof(*args))) {
1466 const struct comm_addr *ca=(void*)argp;
1467 slog(st, LOG_PEER_ADDRS, " args: addrs[%d]=%s",
1468 i, ca->comm->addr_to_string(ca->comm->st,ca));
1470 for (i=0; i<dst->npeers; i++) {
1471 struct timeval diff;
1472 timersub(tv_now,&dst->peers[i].last,&diff);
1473 const struct comm_addr *ca=&dst->peers[i].addr;
1474 slog(st, LOG_PEER_ADDRS, " peers: addrs[%d]=%s T-%ld.%06ld",
1475 i, ca->comm->addr_to_string(ca->comm->st,ca),
1476 (unsigned long)diff.tv_sec, (unsigned long)diff.tv_usec);
1480 static int transport_peer_compar(const void *av, const void *bv) {
1481 const transport_peer *a=av;
1482 const transport_peer *b=bv;
1483 /* put most recent first in the array */
1484 if (timercmp(&a->last, &b->last, <)) return +1;
1485 if (timercmp(&a->last, &b->last, >)) return -11;
1489 static void transport_peers_expire(struct site *st, transport_peers *peers) {
1490 /* peers must be sorted first */
1491 int previous_peers=peers->npeers;
1492 struct timeval oldest;
1493 oldest.tv_sec = tv_now->tv_sec - st->mobile_peer_expiry;
1494 oldest.tv_usec = tv_now->tv_usec;
1495 while (peers->npeers>1 &&
1496 timercmp(&peers->peers[peers->npeers-1].last, &oldest, <))
1498 if (peers->npeers != previous_peers)
1499 transport_peers_debug(st,peers,"expire", 0,0,0);
1502 static void transport_record_peer(struct site *st, transport_peers *peers,
1503 const struct comm_addr *addr, const char *m) {
1504 int slot, changed=0;
1506 for (slot=0; slot<peers->npeers; slot++)
1507 if (!memcmp(&peers->peers[slot].addr, addr, sizeof(*addr)))
1511 if (peers->npeers==st->transport_peers_max)
1512 slot=st->transport_peers_max;
1514 slot=peers->npeers++;
1517 peers->peers[slot].addr=*addr;
1518 peers->peers[slot].last=*tv_now;
1520 if (peers->npeers>1)
1521 qsort(peers->peers, peers->npeers,
1522 sizeof(*peers->peers), transport_peer_compar);
1524 if (changed || peers->npeers!=1)
1525 transport_peers_debug(st,peers,m, 1,addr,0);
1526 transport_peers_expire(st, peers);
1529 static bool_t transport_compute_setupinit_peers(struct site *st,
1530 const struct comm_addr *configured_addr /* 0 if none or not found */) {
1532 if (!configured_addr && !transport_peers_valid(&st->peers))
1535 slog(st,LOG_SETUP_INIT,
1536 (!configured_addr ? "using only %d old peer address(es)"
1537 : "using configured address, and/or perhaps %d old peer address(es)"),
1540 /* Non-mobile peers havve st->peers.npeers==0 or ==1, since they
1541 * have transport_peers_max==1. The effect is that this code
1542 * always uses the configured address if supplied, or otherwise
1543 * the existing data peer if one exists; this is as desired. */
1545 transport_peers_copy(st,&st->setup_peers,&st->peers);
1547 if (configured_addr)
1548 transport_record_peer(st,&st->setup_peers,configured_addr,"setupinit");
1550 assert(transport_peers_valid(&st->setup_peers));
1554 static void transport_setup_msgok(struct site *st, const struct comm_addr *a) {
1555 if (st->peer_mobile)
1556 transport_record_peer(st,&st->setup_peers,a,"setupmsg");
1558 static void transport_data_msgok(struct site *st, const struct comm_addr *a) {
1559 if (st->peer_mobile)
1560 transport_record_peer(st,&st->peers,a,"datamsg");
1563 static int transport_peers_valid(transport_peers *peers) {
1564 return peers->npeers;
1566 static void transport_peers_clear(struct site *st, transport_peers *peers) {
1568 transport_peers_debug(st,peers,"clear",0,0,0);
1570 static void transport_peers_copy(struct site *st, transport_peers *dst,
1571 const transport_peers *src) {
1572 dst->npeers=src->npeers;
1573 memcpy(dst->peers, src->peers, sizeof(*dst->peers) * dst->npeers);
1574 transport_peers_debug(st,dst,"copy",
1575 src->npeers, &src->peers->addr, sizeof(src->peers));
1578 void transport_xmit(struct site *st, transport_peers *peers,
1579 struct buffer_if *buf, bool_t candebug) {
1581 transport_peers_expire(st, peers);
1582 for (slot=0; slot<peers->npeers; slot++) {
1583 transport_peer *peer=&peers->peers[slot];
1585 dump_packet(st, buf, &peer->addr, False);
1586 peer->addr.comm->sendmsg(peer->addr.comm->st, buf, &peer->addr);
1590 /***** END of transport peers declarations *****/