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) */
44 #define DEFAULT_STATIC_PEERS_MAX 3 /* retain at most this many peer addresses */
46 /* Each site can be in one of several possible states. */
49 SITE_STOP - nothing is allowed to happen; tunnel is down;
50 all session keys have been erased
51 -> SITE_RUN upon external instruction
52 SITE_RUN - site up, maybe with valid key
53 -> SITE_RESOLVE upon outgoing packet and no valid key
54 we start name resolution for the other end of the tunnel
55 -> SITE_SENTMSG2 upon valid incoming message 1 and suitable time
56 we send an appropriate message 2
57 SITE_RESOLVE - waiting for name resolution
58 -> SITE_SENTMSG1 upon successful resolution
59 we send an appropriate message 1
60 -> SITE_SENTMSG2 upon valid incoming message 1 (then abort resolution)
61 we abort resolution and
62 -> SITE_WAIT on timeout or resolution failure
64 -> SITE_SENTMSG2 upon valid incoming message 1 from higher priority end
65 -> SITE_SENTMSG3 upon valid incoming message 2
66 -> SITE_WAIT on timeout
68 -> SITE_SENTMSG4 upon valid incoming message 3
69 -> SITE_WAIT on timeout
71 -> SITE_SENTMSG5 upon valid incoming message 4
72 -> SITE_WAIT on timeout
74 -> SITE_RUN upon valid incoming message 5
75 -> SITE_WAIT on timeout
77 -> SITE_RUN upon valid incoming message 6
78 -> SITE_WAIT on timeout
79 SITE_WAIT - failed to establish key; do nothing for a while
80 -> SITE_RUN on timeout
85 #define SITE_RESOLVE 2
86 #define SITE_SENTMSG1 3
87 #define SITE_SENTMSG2 4
88 #define SITE_SENTMSG3 5
89 #define SITE_SENTMSG4 6
90 #define SITE_SENTMSG5 7
93 int32_t site_max_start_pad = 4*4;
95 static cstring_t state_name(uint32_t state)
98 case 0: return "STOP";
100 case 2: return "RESOLVE";
101 case 3: return "SENTMSG1";
102 case 4: return "SENTMSG2";
103 case 5: return "SENTMSG3";
104 case 6: return "SENTMSG4";
105 case 7: return "SENTMSG5";
106 case 8: return "WAIT";
107 default: return "*bad state*";
113 #define LOG_UNEXPECTED 0x00000001
114 #define LOG_SETUP_INIT 0x00000002
115 #define LOG_SETUP_TIMEOUT 0x00000004
116 #define LOG_ACTIVATE_KEY 0x00000008
117 #define LOG_TIMEOUT_KEY 0x00000010
118 #define LOG_SEC 0x00000020
119 #define LOG_STATE 0x00000040
120 #define LOG_DROP 0x00000080
121 #define LOG_DUMP 0x00000100
122 #define LOG_ERROR 0x00000400
123 #define LOG_PEER_ADDRS 0x00000800
125 static struct flagstr log_event_table[]={
126 { "unexpected", LOG_UNEXPECTED },
127 { "setup-init", LOG_SETUP_INIT },
128 { "setup-timeout", LOG_SETUP_TIMEOUT },
129 { "activate-key", LOG_ACTIVATE_KEY },
130 { "timeout-key", LOG_TIMEOUT_KEY },
131 { "security", LOG_SEC },
132 { "state-change", LOG_STATE },
133 { "packet-drop", LOG_DROP },
134 { "dump-packets", LOG_DUMP },
135 { "errors", LOG_ERROR },
136 { "peer-addrs", LOG_PEER_ADDRS },
137 { "default", LOG_SETUP_INIT|LOG_SETUP_TIMEOUT|
138 LOG_ACTIVATE_KEY|LOG_TIMEOUT_KEY|LOG_SEC|LOG_ERROR },
139 { "all", 0xffffffff },
144 /***** TRANSPORT PEERS declarations *****/
146 /* Details of "mobile peer" semantics:
148 - We use the same data structure for the different configurations,
149 but manage it with different algorithms.
151 - We record up to mobile_peers_max peer address/port numbers
152 ("peers") for key setup, and separately up to mobile_peers_max
155 - In general, we make a new set of addrs (see below) when we start
156 a new key exchange; the key setup addrs become the data transport
157 addrs when key setup complets.
159 If our peer is mobile:
161 - We send to all recent addresses of incoming packets, plus
162 initially all configured addresses (which we also expire).
164 - So, we record addrs of good incoming packets, as follows:
165 1. expire any peers last seen >120s ("mobile-peer-expiry") ago
166 2. add the peer of the just received packet to the applicable list
167 (possibly evicting the oldest entries to make room)
168 NB that we do not expire peers until an incoming packet arrives.
170 - If the peer has a configured address or name, we record them the
171 same way, but only as a result of our own initiation of key
172 setup. (We might evict some incoming packet addrs to make room.)
174 - The default number of addrs to keep is 3, or 4 if we have a
175 configured name or address. That's space for two configured
176 addresses (one IPv6 and one IPv4), plus two received addresses.
178 - Outgoing packets are sent to every recorded address in the
179 applicable list. Any unsupported[1] addresses are deleted from
180 the list right away. (This should only happen to configured
181 addresses, of course, but there is no need to check that.)
183 - When we successfully complete a key setup, we merge the key setup
184 peers into the data transfer peers.
186 [1] An unsupported address is one for whose AF we don't have a
187 socket (perhaps because we got EAFNOSUPPORT or some such) or for
188 which sendto gives ENETUNREACH.
190 If neither end is mobile:
192 - When peer initiated the key exchange, we use the incoming packet
195 - When we initiate the key exchange, we try configured addresses
196 until we get one which isn't unsupported then fixate on that.
198 - When we complete a key setup, we replace the data transport peers
199 with those from the key setup.
203 - We can't tell when local network setup changes so we can't cache
204 the unsupported addrs and completely remove the spurious calls to
205 sendto, but we can optimise things a bit by deprioritising addrs
206 which seem to be unsupported.
208 - Use only configured addresses. (Except, that if our peer
209 initiated a key exchange we use the incoming packet address until
210 our name resolution completes.)
212 - When we send a packet, try each address in turn; if addr
213 supported, put that address to the end of the list for future
214 packets, and go onto the next address.
216 - When we complete a key setup, we replace the data transport peers
217 with those from the key setup.
223 struct comm_addr addr;
227 /* configuration information */
228 /* runtime information */
230 transport_peer peers[MAX_PEER_ADDRS];
233 /* Basic operations on transport peer address sets */
234 static void transport_peers_clear(struct site *st, transport_peers *peers);
235 static int transport_peers_valid(transport_peers *peers);
236 static void transport_peers_copy(struct site *st, transport_peers *dst,
237 const transport_peers *src);
239 /* Record address of incoming setup packet; resp. data packet. */
240 static void transport_setup_msgok(struct site *st, const struct comm_addr *a);
241 static void transport_data_msgok(struct site *st, const struct comm_addr *a);
243 /* Initialise the setup addresses. Called before we send the first
244 * packet in a key exchange. If we are the initiator, as a result of
245 * resolve completing (or being determined not to be relevant) or an
246 * incoming PROD; if we are the responder, as a result of the MSG1. */
247 static bool_t transport_compute_setupinit_peers(struct site *st,
248 const struct comm_addr *configured_addrs /* 0 if none or not found */,
249 int n_configured_addrs /* 0 if none or not found */,
250 const struct comm_addr *incoming_packet_addr /* 0 if none */);
252 /* Called if we are the responder in a key setup, when the resolve
253 * completes. transport_compute_setupinit_peers will hvae been called
254 * earlier. If _complete is called, we are still doing the key setup
255 * (and we should use the new values for both the rest of the key
256 * setup and the ongoing data exchange); if _tardy is called, the key
257 * setup is done (either completed or not) and only the data peers are
259 static void transport_resolve_complete(struct site *st,
260 const struct comm_addr *addrs, int naddrs);
261 static void transport_resolve_complete_tardy(struct site *st,
262 const struct comm_addr *addrs, int naddrs);
264 static void transport_xmit(struct site *st, transport_peers *peers,
265 struct buffer_if *buf, bool_t candebug);
267 /***** END of transport peers declarations *****/
271 struct transform_inst_if *transform;
272 uint64_t key_timeout; /* End of life of current key */
273 uint32_t remote_session_id;
279 /* configuration information */
282 bool_t local_mobile, peer_mobile; /* Mobile client support */
283 int32_t transport_peers_max;
284 string_t tunname; /* localname<->remotename by default, used in logs */
285 cstring_t *addresses; /* DNS name or address(es) for bootstrapping, optional */
286 int remoteport; /* Port for bootstrapping, optional */
288 struct netlink_if *netlink;
289 struct comm_if **comms;
291 struct resolver_if *resolver;
293 struct random_if *random;
294 struct rsaprivkey_if *privkey;
295 struct rsapubkey_if *pubkey;
296 struct transform_if **transforms;
299 struct hash_if *hash;
301 uint32_t index; /* Index of this site */
302 uint32_t local_capabilities;
303 int32_t setup_retries; /* How many times to send setup packets */
304 int32_t setup_retry_interval; /* Initial timeout for setup packets */
305 int32_t wait_timeout; /* How long to wait if setup unsuccessful */
306 int32_t mobile_peer_expiry; /* How long to remember 2ary addresses */
307 int32_t key_lifetime; /* How long a key lasts once set up */
308 int32_t key_renegotiate_time; /* If we see traffic (or a keepalive)
309 after this time, initiate a new
312 bool_t setup_priority; /* Do we have precedence if both sites emit
313 message 1 simultaneously? */
316 /* runtime information */
318 uint64_t now; /* Most recently seen time */
319 bool_t allow_send_prod;
321 int resolving_n_results;
322 struct comm_addr resolving_results[MAX_PEER_ADDRS];
324 /* The currently established session */
325 struct data_key current;
326 struct data_key auxiliary_key;
327 bool_t auxiliary_is_new;
328 uint64_t renegotiate_key_time; /* When we can negotiate a new key */
329 uint64_t auxiliary_renegotiate_key_time;
330 transport_peers peers; /* Current address(es) of peer for data traffic */
332 /* The current key setup protocol exchange. We can only be
333 involved in one of these at a time. There's a potential for
334 denial of service here (the attacker keeps sending a setup
335 packet; we keep trying to continue the exchange, and have to
336 timeout before we can listen for another setup packet); perhaps
337 we should keep a list of 'bad' sources for setup packets. */
338 uint32_t remote_capabilities;
339 uint16_t remote_adv_mtu;
340 struct transform_if *chosen_transform;
341 uint32_t setup_session_id;
342 transport_peers setup_peers;
343 uint8_t localN[NONCELEN]; /* Nonces for key exchange */
344 uint8_t remoteN[NONCELEN];
345 struct buffer_if buffer; /* Current outgoing key exchange packet */
346 struct buffer_if scratch;
347 int32_t retries; /* Number of retries remaining */
348 uint64_t timeout; /* Timeout for current state */
350 uint8_t *sharedsecret;
351 uint32_t sharedsecretlen, sharedsecretallocd;
352 struct transform_inst_if *new_transform; /* For key setup/verify */
355 static uint32_t event_log_priority(struct site *st, uint32_t event)
357 if (!(event&st->log_events))
360 case LOG_UNEXPECTED: return M_INFO;
361 case LOG_SETUP_INIT: return M_INFO;
362 case LOG_SETUP_TIMEOUT: return M_NOTICE;
363 case LOG_ACTIVATE_KEY: return M_INFO;
364 case LOG_TIMEOUT_KEY: return M_INFO;
365 case LOG_SEC: return M_SECURITY;
366 case LOG_STATE: return M_DEBUG;
367 case LOG_DROP: return M_DEBUG;
368 case LOG_DUMP: return M_DEBUG;
369 case LOG_ERROR: return M_ERR;
370 case LOG_PEER_ADDRS: return M_DEBUG;
371 default: return M_ERR;
375 static void vslog(struct site *st, uint32_t event, cstring_t msg, va_list ap)
377 static void vslog(struct site *st, uint32_t event, cstring_t msg, va_list ap)
381 class=event_log_priority(st, event);
383 slilog_part(st->log,class,"%s: ",st->tunname);
384 vslilog_part(st->log,class,msg,ap);
385 slilog_part(st->log,class,"\n");
389 static void slog(struct site *st, uint32_t event, cstring_t msg, ...)
391 static void slog(struct site *st, uint32_t event, cstring_t msg, ...)
395 vslog(st,event,msg,ap);
399 static void logtimeout(struct site *st, const char *fmt, ...)
401 static void logtimeout(struct site *st, const char *fmt, ...)
403 uint32_t class=event_log_priority(st,LOG_SETUP_TIMEOUT);
410 slilog_part(st->log,class,"%s: ",st->tunname);
411 vslilog_part(st->log,class,fmt,ap);
415 for (i=0, delim=" (tried ";
416 i<st->setup_peers.npeers;
418 transport_peer *peer=&st->setup_peers.peers[i];
419 const char *s=comm_addr_to_string(&peer->addr);
420 slilog_part(st->log,class,"%s%s",delim,s);
423 slilog_part(st->log,class,")\n");
427 static void set_link_quality(struct site *st);
428 static void delete_keys(struct site *st, cstring_t reason, uint32_t loglevel);
429 static void delete_one_key(struct site *st, struct data_key *key,
430 const char *reason /* may be 0 meaning don't log*/,
431 const char *which /* ignored if !reasonn */,
432 uint32_t loglevel /* ignored if !reasonn */);
433 static bool_t initiate_key_setup(struct site *st, cstring_t reason,
434 const struct comm_addr *prod_hint);
435 static void enter_state_run(struct site *st);
436 static bool_t enter_state_resolve(struct site *st);
437 static void decrement_resolving_count(struct site *st, int by);
438 static bool_t enter_new_state(struct site *st,uint32_t next);
439 static void enter_state_wait(struct site *st);
440 static void activate_new_key(struct site *st);
442 static bool_t is_transform_valid(struct transform_inst_if *transform)
444 return transform && transform->valid(transform->st);
447 static bool_t current_valid(struct site *st)
449 return is_transform_valid(st->current.transform);
452 #define DEFINE_CALL_TRANSFORM(fwdrev) \
453 static int call_transform_##fwdrev(struct site *st, \
454 struct transform_inst_if *transform, \
455 struct buffer_if *buf, \
456 const char **errmsg) \
458 if (!is_transform_valid(transform)) { \
459 *errmsg="transform not set up"; \
462 return transform->fwdrev(transform->st,buf,errmsg); \
465 DEFINE_CALL_TRANSFORM(forwards)
466 DEFINE_CALL_TRANSFORM(reverse)
468 static void dispose_transform(struct transform_inst_if **transform_var)
470 struct transform_inst_if *transform=*transform_var;
472 transform->delkey(transform->st);
473 transform->destroy(transform->st);
478 #define CHECK_AVAIL(b,l) do { if ((b)->size<(l)) return False; } while(0)
479 #define CHECK_EMPTY(b) do { if ((b)->size!=0) return False; } while(0)
480 #define CHECK_TYPE(b,t) do { uint32_t type; \
481 CHECK_AVAIL((b),4); \
482 type=buf_unprepend_uint32((b)); \
483 if (type!=(t)) return False; } while(0)
485 static _Bool type_is_msg34(uint32_t type)
488 type == LABEL_MSG3 ||
489 type == LABEL_MSG3BIS ||
496 struct buffer_if extrainfo;
503 struct parsedname remote;
504 struct parsedname local;
505 uint32_t remote_capabilities;
507 int capab_transformnum;
517 static void set_new_transform(struct site *st, char *pk)
519 /* Make room for the shared key */
520 st->sharedsecretlen=st->chosen_transform->keylen?:st->dh->ceil_len;
521 assert(st->sharedsecretlen);
522 if (st->sharedsecretlen > st->sharedsecretallocd) {
523 st->sharedsecretallocd=st->sharedsecretlen;
524 st->sharedsecret=realloc(st->sharedsecret,st->sharedsecretallocd);
526 if (!st->sharedsecret) fatal_perror("site:sharedsecret");
528 /* Generate the shared key */
529 st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,pk,
530 st->sharedsecret,st->sharedsecretlen);
532 /* Set up the transform */
533 struct transform_if *generator=st->chosen_transform;
534 struct transform_inst_if *generated=generator->create(generator->st);
535 generated->setkey(generated->st,st->sharedsecret,
536 st->sharedsecretlen,st->setup_priority);
537 dispose_transform(&st->new_transform);
538 st->new_transform=generated;
540 slog(st,LOG_SETUP_INIT,"key exchange negotiated transform"
541 " %d (capabilities ours=%#"PRIx32" theirs=%#"PRIx32")",
542 st->chosen_transform->capab_transformnum,
543 st->local_capabilities, st->remote_capabilities);
547 int32_t lenpos, afternul;
549 static void append_string_xinfo_start(struct buffer_if *buf,
550 struct xinfoadd *xia,
552 /* Helps construct one of the names with additional info as found
553 * in MSG1..4. Call this function first, then append all the
554 * desired extra info (not including the nul byte) to the buffer,
555 * then call append_string_xinfo_done. */
557 xia->lenpos = buf->size;
558 buf_append_string(buf,str);
559 buf_append_uint8(buf,0);
560 xia->afternul = buf->size;
562 static void append_string_xinfo_done(struct buffer_if *buf,
563 struct xinfoadd *xia)
565 /* we just need to adjust the string length */
566 if (buf->size == xia->afternul) {
567 /* no extra info, strip the nul too */
568 buf_unappend_uint8(buf);
570 put_uint16(buf->start+xia->lenpos, buf->size-(xia->lenpos+2));
574 /* Build any of msg1 to msg4. msg5 and msg6 are built from the inside
575 out using a transform of config data supplied by netlink */
576 static bool_t generate_msg(struct site *st, uint32_t type, cstring_t what)
582 st->retries=st->setup_retries;
583 BUF_ALLOC(&st->buffer,what);
584 buffer_init(&st->buffer,0);
585 buf_append_uint32(&st->buffer,
586 (type==LABEL_MSG1?0:st->setup_session_id));
587 buf_append_uint32(&st->buffer,st->index);
588 buf_append_uint32(&st->buffer,type);
591 append_string_xinfo_start(&st->buffer,&xia,st->localname);
592 if ((st->local_capabilities & CAPAB_EARLY) || (type != LABEL_MSG1)) {
593 buf_append_uint32(&st->buffer,st->local_capabilities);
595 if (type_is_msg34(type)) {
596 buf_append_uint16(&st->buffer,st->mtu_target);
598 append_string_xinfo_done(&st->buffer,&xia);
600 buf_append_string(&st->buffer,st->remotename);
601 memcpy(buf_append(&st->buffer,NONCELEN),st->localN,NONCELEN);
602 if (type==LABEL_MSG1) return True;
603 memcpy(buf_append(&st->buffer,NONCELEN),st->remoteN,NONCELEN);
604 if (type==LABEL_MSG2) return True;
606 if (hacky_par_mid_failnow()) return False;
608 if (type==LABEL_MSG3BIS)
609 buf_append_uint8(&st->buffer,st->chosen_transform->capab_transformnum);
611 dhpub=st->dh->makepublic(st->dh->st,st->dhsecret,st->dh->len);
612 buf_append_string(&st->buffer,dhpub);
614 hash=safe_malloc(st->hash->len, "generate_msg");
615 hst=st->hash->init();
616 st->hash->update(hst,st->buffer.start,st->buffer.size);
617 st->hash->final(hst,hash);
618 sig=st->privkey->sign(st->privkey->st,hash,st->hash->len);
619 buf_append_string(&st->buffer,sig);
625 static bool_t unpick_name(struct buffer_if *msg, struct parsedname *nm)
628 nm->len=buf_unprepend_uint16(msg);
629 CHECK_AVAIL(msg,nm->len);
630 nm->name=buf_unprepend(msg,nm->len);
631 uint8_t *nul=memchr(nm->name,0,nm->len);
633 buffer_readonly_view(&nm->extrainfo,0,0);
635 buffer_readonly_view(&nm->extrainfo, nul+1, msg->start-(nul+1));
636 nm->len=nul-nm->name;
641 static bool_t unpick_msg(struct site *st, uint32_t type,
642 struct buffer_if *msg, struct msg *m)
644 m->capab_transformnum=-1;
645 m->hashstart=msg->start;
647 m->dest=buf_unprepend_uint32(msg);
649 m->source=buf_unprepend_uint32(msg);
650 CHECK_TYPE(msg,type);
651 if (!unpick_name(msg,&m->remote)) return False;
652 m->remote_capabilities=0;
654 if (m->remote.extrainfo.size) {
655 CHECK_AVAIL(&m->remote.extrainfo,4);
656 m->remote_capabilities=buf_unprepend_uint32(&m->remote.extrainfo);
658 if (type_is_msg34(type) && m->remote.extrainfo.size) {
659 CHECK_AVAIL(&m->remote.extrainfo,2);
660 m->remote_mtu=buf_unprepend_uint16(&m->remote.extrainfo);
662 if (!unpick_name(msg,&m->local)) return False;
663 if (type==LABEL_PROD) {
667 CHECK_AVAIL(msg,NONCELEN);
668 m->nR=buf_unprepend(msg,NONCELEN);
669 if (type==LABEL_MSG1) {
673 CHECK_AVAIL(msg,NONCELEN);
674 m->nL=buf_unprepend(msg,NONCELEN);
675 if (type==LABEL_MSG2) {
679 if (type==LABEL_MSG3BIS) {
681 m->capab_transformnum = buf_unprepend_uint8(msg);
683 m->capab_transformnum = CAPAB_TRANSFORMNUM_ANCIENT;
686 m->pklen=buf_unprepend_uint16(msg);
687 CHECK_AVAIL(msg,m->pklen);
688 m->pk=buf_unprepend(msg,m->pklen);
689 m->hashlen=msg->start-m->hashstart;
691 m->siglen=buf_unprepend_uint16(msg);
692 CHECK_AVAIL(msg,m->siglen);
693 m->sig=buf_unprepend(msg,m->siglen);
698 static bool_t name_matches(const struct parsedname *nm, const char *expected)
700 int expected_len=strlen(expected);
702 nm->len == expected_len &&
703 !memcmp(nm->name, expected, expected_len);
706 static bool_t check_msg(struct site *st, uint32_t type, struct msg *m,
709 if (type==LABEL_MSG1) return True;
711 /* Check that the site names and our nonce have been sent
712 back correctly, and then store our peer's nonce. */
713 if (!name_matches(&m->remote,st->remotename)) {
714 *error="wrong remote site name";
717 if (!name_matches(&m->local,st->localname)) {
718 *error="wrong local site name";
721 if (memcmp(m->nL,st->localN,NONCELEN)!=0) {
722 *error="wrong locally-generated nonce";
725 if (type==LABEL_MSG2) return True;
726 if (!consttime_memeq(m->nR,st->remoteN,NONCELEN)!=0) {
727 *error="wrong remotely-generated nonce";
730 /* MSG3 has complicated rules about capabilities, which are
731 * handled in process_msg3. */
732 if (type==LABEL_MSG3 || type==LABEL_MSG3BIS) return True;
733 if (m->remote_capabilities!=st->remote_capabilities) {
734 *error="remote capabilities changed";
737 if (type==LABEL_MSG4) return True;
738 *error="unknown message type";
742 static bool_t generate_msg1(struct site *st)
744 st->random->generate(st->random->st,NONCELEN,st->localN);
745 return generate_msg(st,LABEL_MSG1,"site:MSG1");
748 static bool_t process_msg1(struct site *st, struct buffer_if *msg1,
749 const struct comm_addr *src, struct msg *m)
751 /* We've already determined we're in an appropriate state to
752 process an incoming MSG1, and that the MSG1 has correct values
755 st->setup_session_id=m->source;
756 st->remote_capabilities=m->remote_capabilities;
757 memcpy(st->remoteN,m->nR,NONCELEN);
761 static bool_t generate_msg2(struct site *st)
763 st->random->generate(st->random->st,NONCELEN,st->localN);
764 return generate_msg(st,LABEL_MSG2,"site:MSG2");
767 static bool_t process_msg2(struct site *st, struct buffer_if *msg2,
768 const struct comm_addr *src)
773 if (!unpick_msg(st,LABEL_MSG2,msg2,&m)) return False;
774 if (!check_msg(st,LABEL_MSG2,&m,&err)) {
775 slog(st,LOG_SEC,"msg2: %s",err);
778 st->setup_session_id=m.source;
779 st->remote_capabilities=m.remote_capabilities;
781 /* Select the transform to use */
783 uint32_t remote_transforms = st->remote_capabilities & CAPAB_TRANSFORM_MASK;
784 if (!remote_transforms)
785 /* old secnets only had this one transform */
786 remote_transforms = 1UL << CAPAB_TRANSFORMNUM_ANCIENT;
788 struct transform_if *ti;
790 for (i=0; i<st->ntransforms; i++) {
791 ti=st->transforms[i];
792 if ((1UL << ti->capab_transformnum) & remote_transforms)
793 goto transform_found;
795 slog(st,LOG_ERROR,"no transforms in common"
796 " (us %#"PRIx32"; them: %#"PRIx32")",
797 st->local_capabilities & CAPAB_TRANSFORM_MASK,
801 st->chosen_transform=ti;
803 memcpy(st->remoteN,m.nR,NONCELEN);
807 static bool_t generate_msg3(struct site *st)
809 /* Now we have our nonce and their nonce. Think of a secret key,
810 and create message number 3. */
811 st->random->generate(st->random->st,st->dh->len,st->dhsecret);
812 return generate_msg(st,
813 (st->remote_capabilities & CAPAB_TRANSFORM_MASK
814 ? LABEL_MSG3BIS : LABEL_MSG3),
818 static bool_t process_msg3_msg4(struct site *st, struct msg *m)
823 /* Check signature and store g^x mod m */
824 hash=safe_malloc(st->hash->len, "process_msg3_msg4");
825 hst=st->hash->init();
826 st->hash->update(hst,m->hashstart,m->hashlen);
827 st->hash->final(hst,hash);
828 /* Terminate signature with a '0' - cheating, but should be ok */
830 if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m->sig)) {
831 slog(st,LOG_SEC,"msg3/msg4 signature failed check!");
837 st->remote_adv_mtu=m->remote_mtu;
842 static bool_t process_msg3(struct site *st, struct buffer_if *msg3,
843 const struct comm_addr *src, uint32_t msgtype)
848 assert(msgtype==LABEL_MSG3 || msgtype==LABEL_MSG3BIS);
850 if (!unpick_msg(st,msgtype,msg3,&m)) return False;
851 if (!check_msg(st,msgtype,&m,&err)) {
852 slog(st,LOG_SEC,"msg3: %s",err);
855 uint32_t capab_adv_late = m.remote_capabilities
856 & ~st->remote_capabilities & CAPAB_EARLY;
857 if (capab_adv_late) {
858 slog(st,LOG_SEC,"msg3 impermissibly adds early capability flag(s)"
859 " %#"PRIx32" (was %#"PRIx32", now %#"PRIx32")",
860 capab_adv_late, st->remote_capabilities, m.remote_capabilities);
863 st->remote_capabilities|=m.remote_capabilities;
865 struct transform_if *ti;
867 for (i=0; i<st->ntransforms; i++) {
868 ti=st->transforms[i];
869 if (ti->capab_transformnum == m.capab_transformnum)
870 goto transform_found;
872 slog(st,LOG_SEC,"peer chose unknown-to-us transform %d!",
873 m.capab_transformnum);
876 st->chosen_transform=ti;
878 if (!process_msg3_msg4(st,&m))
881 /* Terminate their DH public key with a '0' */
883 /* Invent our DH secret key */
884 st->random->generate(st->random->st,st->dh->len,st->dhsecret);
886 /* Generate the shared key and set up the transform */
887 set_new_transform(st,m.pk);
892 static bool_t generate_msg4(struct site *st)
894 /* We have both nonces, their public key and our private key. Generate
895 our public key, sign it and send it to them. */
896 return generate_msg(st,LABEL_MSG4,"site:MSG4");
899 static bool_t process_msg4(struct site *st, struct buffer_if *msg4,
900 const struct comm_addr *src)
905 if (!unpick_msg(st,LABEL_MSG4,msg4,&m)) return False;
906 if (!check_msg(st,LABEL_MSG4,&m,&err)) {
907 slog(st,LOG_SEC,"msg4: %s",err);
911 if (!process_msg3_msg4(st,&m))
914 /* Terminate their DH public key with a '0' */
917 /* Generate the shared key and set up the transform */
918 set_new_transform(st,m.pk);
929 static bool_t unpick_msg0(struct site *st, struct buffer_if *msg0,
933 m->dest=buf_unprepend_uint32(msg0);
935 m->source=buf_unprepend_uint32(msg0);
937 m->type=buf_unprepend_uint32(msg0);
939 /* Leaves transformed part of buffer untouched */
942 static bool_t generate_msg5(struct site *st)
944 cstring_t transform_err;
946 BUF_ALLOC(&st->buffer,"site:MSG5");
947 /* We are going to add four words to the message */
948 buffer_init(&st->buffer,calculate_max_start_pad());
949 /* Give the netlink code an opportunity to put its own stuff in the
950 message (configuration information, etc.) */
951 buf_prepend_uint32(&st->buffer,LABEL_MSG5);
952 if (call_transform_forwards(st,st->new_transform,
953 &st->buffer,&transform_err))
955 buf_prepend_uint32(&st->buffer,LABEL_MSG5);
956 buf_prepend_uint32(&st->buffer,st->index);
957 buf_prepend_uint32(&st->buffer,st->setup_session_id);
959 st->retries=st->setup_retries;
963 static bool_t process_msg5(struct site *st, struct buffer_if *msg5,
964 const struct comm_addr *src,
965 struct transform_inst_if *transform)
968 cstring_t transform_err;
970 if (!unpick_msg0(st,msg5,&m)) return False;
972 if (call_transform_reverse(st,transform,msg5,&transform_err)) {
973 /* There's a problem */
974 slog(st,LOG_SEC,"process_msg5: transform: %s",transform_err);
977 /* Buffer should now contain untransformed PING packet data */
979 if (buf_unprepend_uint32(msg5)!=LABEL_MSG5) {
980 slog(st,LOG_SEC,"MSG5/PING packet contained wrong label");
983 /* Older versions of secnet used to write some config data here
984 * which we ignore. So we don't CHECK_EMPTY */
988 static void create_msg6(struct site *st, struct transform_inst_if *transform,
991 cstring_t transform_err;
993 BUF_ALLOC(&st->buffer,"site:MSG6");
994 /* We are going to add four words to the message */
995 buffer_init(&st->buffer,calculate_max_start_pad());
996 /* Give the netlink code an opportunity to put its own stuff in the
997 message (configuration information, etc.) */
998 buf_prepend_uint32(&st->buffer,LABEL_MSG6);
999 int problem = call_transform_forwards(st,transform,
1000 &st->buffer,&transform_err);
1002 buf_prepend_uint32(&st->buffer,LABEL_MSG6);
1003 buf_prepend_uint32(&st->buffer,st->index);
1004 buf_prepend_uint32(&st->buffer,session_id);
1007 static bool_t generate_msg6(struct site *st)
1009 if (!is_transform_valid(st->new_transform))
1011 create_msg6(st,st->new_transform,st->setup_session_id);
1012 st->retries=1; /* Peer will retransmit MSG5 if this packet gets lost */
1016 static bool_t process_msg6(struct site *st, struct buffer_if *msg6,
1017 const struct comm_addr *src)
1020 cstring_t transform_err;
1022 if (!unpick_msg0(st,msg6,&m)) return False;
1024 if (call_transform_reverse(st,st->new_transform,msg6,&transform_err)) {
1025 /* There's a problem */
1026 slog(st,LOG_SEC,"process_msg6: transform: %s",transform_err);
1029 /* Buffer should now contain untransformed PING packet data */
1030 CHECK_AVAIL(msg6,4);
1031 if (buf_unprepend_uint32(msg6)!=LABEL_MSG6) {
1032 slog(st,LOG_SEC,"MSG6/PONG packet contained invalid data");
1035 /* Older versions of secnet used to write some config data here
1036 * which we ignore. So we don't CHECK_EMPTY */
1040 static bool_t decrypt_msg0(struct site *st, struct buffer_if *msg0,
1041 const struct comm_addr *src)
1043 cstring_t transform_err, auxkey_err, newkey_err="n/a";
1047 if (!unpick_msg0(st,msg0,&m)) return False;
1049 /* Keep a copy so we can try decrypting it with multiple keys */
1050 buffer_copy(&st->scratch, msg0);
1052 problem = call_transform_reverse(st,st->current.transform,
1053 msg0,&transform_err);
1055 if (!st->auxiliary_is_new)
1056 delete_one_key(st,&st->auxiliary_key,
1057 "peer has used new key","auxiliary key",LOG_SEC);
1063 buffer_copy(msg0, &st->scratch);
1064 problem = call_transform_reverse(st,st->auxiliary_key.transform,
1067 slog(st,LOG_DROP,"processing packet which uses auxiliary key");
1068 if (st->auxiliary_is_new) {
1069 /* We previously timed out in state SENTMSG5 but it turns
1070 * out that our peer did in fact get our MSG5 and is
1071 * using the new key. So we should switch to it too. */
1072 /* This is a bit like activate_new_key. */
1075 st->current=st->auxiliary_key;
1076 st->auxiliary_key=t;
1078 delete_one_key(st,&st->auxiliary_key,"peer has used new key",
1079 "previous key",LOG_SEC);
1080 st->auxiliary_is_new=0;
1081 st->renegotiate_key_time=st->auxiliary_renegotiate_key_time;
1088 if (st->state==SITE_SENTMSG5) {
1089 buffer_copy(msg0, &st->scratch);
1090 problem = call_transform_reverse(st,st->new_transform,
1093 /* It looks like we didn't get the peer's MSG6 */
1094 /* This is like a cut-down enter_new_state(SITE_RUN) */
1095 slog(st,LOG_STATE,"will enter state RUN (MSG0 with new key)");
1096 BUF_FREE(&st->buffer);
1098 activate_new_key(st);
1099 return True; /* do process the data in this packet */
1105 slog(st,LOG_SEC,"transform: %s (aux: %s, new: %s)",
1106 transform_err,auxkey_err,newkey_err);
1107 initiate_key_setup(st,"incoming message would not decrypt",0);
1108 send_nak(src,m.dest,m.source,m.type,msg0,"message would not decrypt");
1112 slog(st,LOG_DROP,"transform: %s (merely skew)",transform_err);
1116 static bool_t process_msg0(struct site *st, struct buffer_if *msg0,
1117 const struct comm_addr *src)
1121 if (!decrypt_msg0(st,msg0,src))
1124 CHECK_AVAIL(msg0,4);
1125 type=buf_unprepend_uint32(msg0);
1128 /* We must forget about the current session. */
1129 delete_keys(st,"request from peer",LOG_SEC);
1132 /* Deliver to netlink layer */
1133 st->netlink->deliver(st->netlink->st,msg0);
1134 transport_data_msgok(st,src);
1135 /* See whether we should start negotiating a new key */
1136 if (st->now > st->renegotiate_key_time)
1137 initiate_key_setup(st,"incoming packet in renegotiation window",0);
1140 slog(st,LOG_SEC,"incoming encrypted message of type %08x "
1147 static void dump_packet(struct site *st, struct buffer_if *buf,
1148 const struct comm_addr *addr, bool_t incoming)
1150 uint32_t dest=get_uint32(buf->start);
1151 uint32_t source=get_uint32(buf->start+4);
1152 uint32_t msgtype=get_uint32(buf->start+8);
1154 if (st->log_events & LOG_DUMP)
1155 slilog(st->log,M_DEBUG,"%s: %s: %08x<-%08x: %08x:",
1156 st->tunname,incoming?"incoming":"outgoing",
1157 dest,source,msgtype);
1160 static uint32_t site_status(void *st)
1165 static bool_t send_msg(struct site *st)
1167 if (st->retries>0) {
1168 transport_xmit(st, &st->setup_peers, &st->buffer, True);
1169 st->timeout=st->now+st->setup_retry_interval;
1172 } else if (st->state==SITE_SENTMSG5) {
1173 logtimeout(st,"timed out sending MSG5, stashing new key");
1174 /* We stash the key we have produced, in case it turns out that
1175 * our peer did see our MSG5 after all and starts using it. */
1176 /* This is a bit like some of activate_new_key */
1177 struct transform_inst_if *t;
1178 t=st->auxiliary_key.transform;
1179 st->auxiliary_key.transform=st->new_transform;
1180 st->new_transform=t;
1181 dispose_transform(&st->new_transform);
1183 st->auxiliary_is_new=1;
1184 st->auxiliary_key.key_timeout=st->now+st->key_lifetime;
1185 st->auxiliary_renegotiate_key_time=st->now+st->key_renegotiate_time;
1186 st->auxiliary_key.remote_session_id=st->setup_session_id;
1188 enter_state_wait(st);
1191 logtimeout(st,"timed out sending key setup packet "
1192 "(in state %s)",state_name(st->state));
1193 enter_state_wait(st);
1198 static void site_resolve_callback(void *sst, const struct comm_addr *addrs,
1199 int naddrs, const char *address,
1200 const char *failwhy)
1202 struct site *st=sst;
1205 slog(st,LOG_ERROR,"resolution of %s failed: %s",address,failwhy);
1207 slog(st,LOG_PEER_ADDRS,"resolution of %s completed, %d addrs, eg: %s",
1208 address, naddrs, comm_addr_to_string(&addrs[0]));;
1210 int n_tocopy = MIN(st->transport_peers_max - st->resolving_n_results,
1212 memcpy(st->resolving_results + st->resolving_n_results,
1214 sizeof(st->resolving_results[0]) * n_tocopy);
1215 st->resolving_n_results += naddrs;
1218 decrement_resolving_count(st,1);
1221 static void decrement_resolving_count(struct site *st, int by)
1223 assert(st->resolving_count>0);
1224 st->resolving_count-=by;
1226 if (st->resolving_count)
1229 /* OK, we are done with them all. Handle combined results. */
1231 const struct comm_addr *addrs=st->resolving_results;
1232 int naddrs=st->resolving_n_results;
1235 slog(st,LOG_STATE,"resolution completed, %d addrs, eg: %s",
1236 naddrs, comm_addr_to_string(&addrs[0]));;
1237 if (st->resolving_n_results > st->transport_peers_max) {
1238 slog(st,LOG_STATE,"resolution of supplied addresses/names"
1239 " yielded too many results (%d > %d), some ignored",
1240 st->resolving_n_results, st->transport_peers_max);
1241 st->resolving_n_results=st->transport_peers_max;
1245 switch (st->state) {
1247 if (transport_compute_setupinit_peers(st,addrs,naddrs,0)) {
1248 enter_new_state(st,SITE_SENTMSG1);
1250 /* Can't figure out who to try to to talk to */
1251 slog(st,LOG_SETUP_INIT,
1252 "key exchange failed: cannot find peer address");
1253 enter_state_run(st);
1256 case SITE_SENTMSG1: case SITE_SENTMSG2:
1257 case SITE_SENTMSG3: case SITE_SENTMSG4:
1260 /* We start using the address immediately for data too.
1261 * It's best to store it in st->peers now because we might
1262 * go via SENTMSG5, WAIT, and a MSG0, straight into using
1263 * the new key (without updating the data peer addrs). */
1264 transport_resolve_complete(st,addrs,naddrs);
1265 } else if (st->local_mobile) {
1266 /* We can't let this rest because we may have a peer
1267 * address which will break in the future. */
1268 slog(st,LOG_SETUP_INIT,"resolution failed: "
1269 "abandoning key exchange");
1270 enter_state_wait(st);
1272 slog(st,LOG_SETUP_INIT,"resolution failed: "
1273 " continuing to use source address of peer's packets"
1274 " for key exchange and ultimately data");
1279 slog(st,LOG_SETUP_INIT,"resolution completed tardily,"
1280 " updating peer address(es)");
1281 transport_resolve_complete_tardy(st,addrs,naddrs);
1282 } else if (st->local_mobile) {
1283 /* Not very good. We should queue (another) renegotiation
1284 * so that we can update the peer address. */
1285 st->key_renegotiate_time=st->now+st->wait_timeout;
1287 slog(st,LOG_SETUP_INIT,"resolution failed: "
1288 " continuing to use source address of peer's packets");
1298 static bool_t initiate_key_setup(struct site *st, cstring_t reason,
1299 const struct comm_addr *prod_hint)
1301 /* Reentrancy hazard: can call enter_new_state/enter_state_* */
1302 if (st->state!=SITE_RUN) return False;
1303 slog(st,LOG_SETUP_INIT,"initiating key exchange (%s)",reason);
1304 if (st->addresses) {
1305 slog(st,LOG_SETUP_INIT,"resolving peer address(es)");
1306 return enter_state_resolve(st);
1307 } else if (transport_compute_setupinit_peers(st,0,0,prod_hint)) {
1308 return enter_new_state(st,SITE_SENTMSG1);
1310 slog(st,LOG_SETUP_INIT,"key exchange failed: no address for peer");
1314 static void activate_new_key(struct site *st)
1316 struct transform_inst_if *t;
1318 /* We have three transform instances, which we swap between old,
1320 t=st->auxiliary_key.transform;
1321 st->auxiliary_key.transform=st->current.transform;
1322 st->current.transform=st->new_transform;
1323 st->new_transform=t;
1324 dispose_transform(&st->new_transform);
1327 st->auxiliary_is_new=0;
1328 st->auxiliary_key.key_timeout=st->current.key_timeout;
1329 st->current.key_timeout=st->now+st->key_lifetime;
1330 st->renegotiate_key_time=st->now+st->key_renegotiate_time;
1331 transport_peers_copy(st,&st->peers,&st->setup_peers);
1332 st->current.remote_session_id=st->setup_session_id;
1334 /* Compute the inter-site MTU. This is min( our_mtu, their_mtu ).
1335 * But their mtu be unspecified, in which case we just use ours. */
1336 uint32_t intersite_mtu=
1337 MIN(st->mtu_target, st->remote_adv_mtu ?: ~(uint32_t)0);
1338 st->netlink->set_mtu(st->netlink->st,intersite_mtu);
1340 slog(st,LOG_ACTIVATE_KEY,"new key activated"
1341 " (mtu ours=%"PRId32" theirs=%"PRId32" intersite=%"PRId32")",
1342 st->mtu_target, st->remote_adv_mtu, intersite_mtu);
1343 enter_state_run(st);
1346 static void delete_one_key(struct site *st, struct data_key *key,
1347 cstring_t reason, cstring_t which, uint32_t loglevel)
1349 if (!is_transform_valid(key->transform)) return;
1350 if (reason) slog(st,loglevel,"%s deleted (%s)",which,reason);
1351 dispose_transform(&key->transform);
1355 static void delete_keys(struct site *st, cstring_t reason, uint32_t loglevel)
1357 if (current_valid(st)) {
1358 slog(st,loglevel,"session closed (%s)",reason);
1360 delete_one_key(st,&st->current,0,0,0);
1361 set_link_quality(st);
1363 delete_one_key(st,&st->auxiliary_key,0,0,0);
1366 static void state_assert(struct site *st, bool_t ok)
1368 if (!ok) fatal("site:state_assert");
1371 static void enter_state_stop(struct site *st)
1373 st->state=SITE_STOP;
1375 delete_keys(st,"entering state STOP",LOG_TIMEOUT_KEY);
1376 dispose_transform(&st->new_transform);
1379 static void set_link_quality(struct site *st)
1382 if (current_valid(st))
1383 quality=LINK_QUALITY_UP;
1384 else if (st->state==SITE_WAIT || st->state==SITE_STOP)
1385 quality=LINK_QUALITY_DOWN;
1386 else if (st->addresses)
1387 quality=LINK_QUALITY_DOWN_CURRENT_ADDRESS;
1388 else if (transport_peers_valid(&st->peers))
1389 quality=LINK_QUALITY_DOWN_STALE_ADDRESS;
1391 quality=LINK_QUALITY_DOWN;
1393 st->netlink->set_quality(st->netlink->st,quality);
1396 static void enter_state_run(struct site *st)
1398 slog(st,LOG_STATE,"entering state RUN");
1402 st->setup_session_id=0;
1403 transport_peers_clear(st,&st->setup_peers);
1404 memset(st->localN,0,NONCELEN);
1405 memset(st->remoteN,0,NONCELEN);
1406 dispose_transform(&st->new_transform);
1407 memset(st->dhsecret,0,st->dh->len);
1408 memset(st->sharedsecret,0,st->sharedsecretlen);
1409 set_link_quality(st);
1412 static bool_t ensure_resolving(struct site *st)
1414 /* Reentrancy hazard: may call site_resolve_callback and hence
1415 * enter_new_state, enter_state_* and generate_msg*. */
1416 if (st->resolving_count)
1419 assert(st->addresses);
1421 /* resolver->request might reentrantly call site_resolve_callback
1422 * which will decrement st->resolving, so we need to increment it
1423 * twice beforehand to prevent decrement from thinking we're
1424 * finished, and decrement it ourselves. Alternatively if
1425 * everything fails then there are no callbacks due and we simply
1426 * set it to 0 and return false.. */
1427 st->resolving_count+=2;
1428 const char **addrp=st->addresses;
1429 const char *address;
1431 for (; (address=*addrp++); ) {
1432 bool_t ok = st->resolver->request(st->resolver->st,address,
1433 st->remoteport,st->comms[0],
1434 site_resolve_callback,st);
1436 st->resolving_count++;
1440 st->resolving_count=0;
1443 decrement_resolving_count(st,2);
1447 static bool_t enter_state_resolve(struct site *st)
1449 /* Reentrancy hazard! See ensure_resolving. */
1450 state_assert(st,st->state==SITE_RUN);
1451 slog(st,LOG_STATE,"entering state RESOLVE");
1452 st->state=SITE_RESOLVE;
1453 return ensure_resolving(st);
1456 static bool_t enter_new_state(struct site *st, uint32_t next)
1458 bool_t (*gen)(struct site *st);
1461 slog(st,LOG_STATE,"entering state %s",state_name(next));
1464 state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE);
1468 state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE ||
1469 st->state==SITE_SENTMSG1 || st->state==SITE_WAIT);
1473 state_assert(st,st->state==SITE_SENTMSG1);
1474 BUF_FREE(&st->buffer);
1478 state_assert(st,st->state==SITE_SENTMSG2);
1479 BUF_FREE(&st->buffer);
1483 state_assert(st,st->state==SITE_SENTMSG3);
1484 BUF_FREE(&st->buffer);
1488 state_assert(st,st->state==SITE_SENTMSG4);
1489 BUF_FREE(&st->buffer);
1494 fatal("enter_new_state(%s): invalid new state",state_name(next));
1498 if (hacky_par_start_failnow()) return False;
1500 r= gen(st) && send_msg(st);
1503 st->setup_retries, st->setup_retry_interval,
1508 if (next==SITE_RUN) {
1509 BUF_FREE(&st->buffer); /* Never reused */
1510 st->timeout=0; /* Never retransmit */
1511 activate_new_key(st);
1515 slog(st,LOG_ERROR,"error entering state %s",state_name(next));
1516 st->buffer.free=False; /* Unconditionally use the buffer; it may be
1517 in either state, and enter_state_wait() will
1519 enter_state_wait(st);
1523 /* msg7 tells our peer that we're about to forget our key */
1524 static bool_t send_msg7(struct site *st, cstring_t reason)
1526 cstring_t transform_err;
1528 if (current_valid(st) && st->buffer.free
1529 && transport_peers_valid(&st->peers)) {
1530 BUF_ALLOC(&st->buffer,"site:MSG7");
1531 buffer_init(&st->buffer,calculate_max_start_pad());
1532 buf_append_uint32(&st->buffer,LABEL_MSG7);
1533 buf_append_string(&st->buffer,reason);
1534 if (call_transform_forwards(st, st->current.transform,
1535 &st->buffer, &transform_err))
1537 buf_prepend_uint32(&st->buffer,LABEL_MSG0);
1538 buf_prepend_uint32(&st->buffer,st->index);
1539 buf_prepend_uint32(&st->buffer,st->current.remote_session_id);
1540 transport_xmit(st,&st->peers,&st->buffer,True);
1541 BUF_FREE(&st->buffer);
1548 /* We go into this state if our peer becomes uncommunicative. Similar to
1549 the "stop" state, we forget all session keys for a while, before
1550 re-entering the "run" state. */
1551 static void enter_state_wait(struct site *st)
1553 slog(st,LOG_STATE,"entering state WAIT");
1554 st->timeout=st->now+st->wait_timeout;
1555 st->state=SITE_WAIT;
1556 set_link_quality(st);
1557 BUF_FREE(&st->buffer); /* will have had an outgoing packet in it */
1558 /* XXX Erase keys etc. */
1561 static void generate_prod(struct site *st, struct buffer_if *buf)
1564 buf_append_uint32(buf,0);
1565 buf_append_uint32(buf,0);
1566 buf_append_uint32(buf,LABEL_PROD);
1567 buf_append_string(buf,st->localname);
1568 buf_append_string(buf,st->remotename);
1571 static void generate_send_prod(struct site *st,
1572 const struct comm_addr *source)
1574 if (!st->allow_send_prod) return; /* too soon */
1575 if (!(st->state==SITE_RUN || st->state==SITE_RESOLVE ||
1576 st->state==SITE_WAIT)) return; /* we'd ignore peer's MSG1 */
1578 slog(st,LOG_SETUP_INIT,"prodding peer for key exchange");
1579 st->allow_send_prod=0;
1580 generate_prod(st,&st->scratch);
1581 dump_packet(st,&st->scratch,source,False);
1582 source->comm->sendmsg(source->comm->st, &st->scratch, source);
1585 static inline void site_settimeout(uint64_t timeout, int *timeout_io)
1588 int64_t offset=timeout-*now;
1589 if (offset<0) offset=0;
1590 if (offset>INT_MAX) offset=INT_MAX;
1591 if (*timeout_io<0 || offset<*timeout_io)
1596 static int site_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
1599 struct site *st=sst;
1601 BEFOREPOLL_WANT_FDS(0); /* We don't use any file descriptors */
1604 /* Work out when our next timeout is. The earlier of 'timeout' or
1605 'current.key_timeout'. A stored value of '0' indicates no timeout
1607 site_settimeout(st->timeout, timeout_io);
1608 site_settimeout(st->current.key_timeout, timeout_io);
1609 site_settimeout(st->auxiliary_key.key_timeout, timeout_io);
1611 return 0; /* success */
1614 static void check_expiry(struct site *st, struct data_key *key,
1617 if (key->key_timeout && *now>key->key_timeout) {
1618 delete_one_key(st,key,"maximum life exceeded",which,LOG_TIMEOUT_KEY);
1622 /* NB site_afterpoll will be called before site_beforepoll is ever called */
1623 static void site_afterpoll(void *sst, struct pollfd *fds, int nfds)
1625 struct site *st=sst;
1628 if (st->timeout && *now>st->timeout) {
1630 if (st->state>=SITE_SENTMSG1 && st->state<=SITE_SENTMSG5) {
1631 if (!hacky_par_start_failnow())
1633 } else if (st->state==SITE_WAIT) {
1634 enter_state_run(st);
1636 slog(st,LOG_ERROR,"site_afterpoll: unexpected timeout, state=%d",
1640 check_expiry(st,&st->current,"current key");
1641 check_expiry(st,&st->auxiliary_key,"auxiliary key");
1644 /* This function is called by the netlink device to deliver packets
1645 intended for the remote network. The packet is in "raw" wire
1646 format, but is guaranteed to be word-aligned. */
1647 static void site_outgoing(void *sst, struct buffer_if *buf)
1649 struct site *st=sst;
1650 cstring_t transform_err;
1652 if (st->state==SITE_STOP) {
1657 st->allow_send_prod=1;
1659 /* In all other states we consider delivering the packet if we have
1660 a valid key and a valid address to send it to. */
1661 if (current_valid(st) && transport_peers_valid(&st->peers)) {
1662 /* Transform it and send it */
1664 buf_prepend_uint32(buf,LABEL_MSG9);
1665 if (call_transform_forwards(st, st->current.transform,
1666 buf, &transform_err))
1668 buf_prepend_uint32(buf,LABEL_MSG0);
1669 buf_prepend_uint32(buf,st->index);
1670 buf_prepend_uint32(buf,st->current.remote_session_id);
1671 transport_xmit(st,&st->peers,buf,False);
1678 slog(st,LOG_DROP,"discarding outgoing packet of size %d",buf->size);
1680 initiate_key_setup(st,"outgoing packet",0);
1683 static bool_t named_for_us(struct site *st, const struct buffer_if *buf_in,
1684 uint32_t type, struct msg *m)
1685 /* For packets which are identified by the local and remote names.
1686 * If it has our name and our peer's name in it it's for us. */
1688 struct buffer_if buf[1];
1689 buffer_readonly_clone(buf,buf_in);
1690 return unpick_msg(st,type,buf,m)
1691 && name_matches(&m->remote,st->remotename)
1692 && name_matches(&m->local,st->localname);
1695 /* This function is called by the communication device to deliver
1696 packets from our peers.
1697 It should return True if the packet is recognised as being for
1698 this current site instance (and should therefore not be processed
1699 by other sites), even if the packet was otherwise ignored. */
1700 static bool_t site_incoming(void *sst, struct buffer_if *buf,
1701 const struct comm_addr *source)
1703 struct site *st=sst;
1705 if (buf->size < 12) return False;
1707 uint32_t dest=get_uint32(buf->start);
1708 uint32_t msgtype=get_uint32(buf->start+8);
1709 struct msg named_msg;
1711 if (msgtype==LABEL_MSG1) {
1712 if (!named_for_us(st,buf,msgtype,&named_msg))
1714 /* It's a MSG1 addressed to us. Decide what to do about it. */
1715 dump_packet(st,buf,source,True);
1716 if (st->state==SITE_RUN || st->state==SITE_RESOLVE ||
1717 st->state==SITE_WAIT) {
1718 /* We should definitely process it */
1719 transport_compute_setupinit_peers(st,0,0,source);
1720 if (process_msg1(st,buf,source,&named_msg)) {
1721 slog(st,LOG_SETUP_INIT,"key setup initiated by peer");
1722 bool_t entered=enter_new_state(st,SITE_SENTMSG2);
1723 if (entered && st->addresses && st->local_mobile)
1724 /* We must do this as the very last thing, because
1725 the resolver callback might reenter us. */
1726 ensure_resolving(st);
1728 slog(st,LOG_ERROR,"failed to process incoming msg1");
1732 } else if (st->state==SITE_SENTMSG1) {
1733 /* We've just sent a message 1! They may have crossed on
1734 the wire. If we have priority then we ignore the
1735 incoming one, otherwise we process it as usual. */
1736 if (st->setup_priority) {
1738 slog(st,LOG_DUMP,"crossed msg1s; we are higher "
1739 "priority => ignore incoming msg1");
1742 slog(st,LOG_DUMP,"crossed msg1s; we are lower "
1743 "priority => use incoming msg1");
1744 if (process_msg1(st,buf,source,&named_msg)) {
1745 BUF_FREE(&st->buffer); /* Free our old message 1 */
1746 transport_setup_msgok(st,source);
1747 enter_new_state(st,SITE_SENTMSG2);
1749 slog(st,LOG_ERROR,"failed to process an incoming "
1750 "crossed msg1 (we have low priority)");
1756 /* The message 1 was received at an unexpected stage of the
1757 key setup. XXX POLICY - what do we do? */
1758 slog(st,LOG_UNEXPECTED,"unexpected incoming message 1");
1762 if (msgtype==LABEL_PROD) {
1763 if (!named_for_us(st,buf,msgtype,&named_msg))
1765 dump_packet(st,buf,source,True);
1766 if (st->state!=SITE_RUN) {
1767 slog(st,LOG_DROP,"ignoring PROD when not in state RUN");
1768 } else if (current_valid(st)) {
1769 slog(st,LOG_DROP,"ignoring PROD when we think we have a key");
1771 initiate_key_setup(st,"peer sent PROD packet",source);
1776 if (dest==st->index) {
1777 /* Explicitly addressed to us */
1778 if (msgtype!=LABEL_MSG0) dump_packet(st,buf,source,True);
1781 /* If the source is our current peer then initiate a key setup,
1782 because our peer's forgotten the key */
1783 if (get_uint32(buf->start+4)==st->current.remote_session_id) {
1785 initiated = initiate_key_setup(st,"received a NAK",source);
1786 if (!initiated) generate_send_prod(st,source);
1788 slog(st,LOG_SEC,"bad incoming NAK");
1792 process_msg0(st,buf,source);
1795 /* Setup packet: should not have been explicitly addressed
1797 slog(st,LOG_SEC,"incoming explicitly addressed msg1");
1800 /* Setup packet: expected only in state SENTMSG1 */
1801 if (st->state!=SITE_SENTMSG1) {
1802 slog(st,LOG_UNEXPECTED,"unexpected MSG2");
1803 } else if (process_msg2(st,buf,source)) {
1804 transport_setup_msgok(st,source);
1805 enter_new_state(st,SITE_SENTMSG3);
1807 slog(st,LOG_SEC,"invalid MSG2");
1812 /* Setup packet: expected only in state SENTMSG2 */
1813 if (st->state!=SITE_SENTMSG2) {
1814 slog(st,LOG_UNEXPECTED,"unexpected MSG3");
1815 } else if (process_msg3(st,buf,source,msgtype)) {
1816 transport_setup_msgok(st,source);
1817 enter_new_state(st,SITE_SENTMSG4);
1819 slog(st,LOG_SEC,"invalid MSG3");
1823 /* Setup packet: expected only in state SENTMSG3 */
1824 if (st->state!=SITE_SENTMSG3) {
1825 slog(st,LOG_UNEXPECTED,"unexpected MSG4");
1826 } else if (process_msg4(st,buf,source)) {
1827 transport_setup_msgok(st,source);
1828 enter_new_state(st,SITE_SENTMSG5);
1830 slog(st,LOG_SEC,"invalid MSG4");
1834 /* Setup packet: expected only in state SENTMSG4 */
1835 /* (may turn up in state RUN if our return MSG6 was lost
1836 and the new key has already been activated. In that
1837 case we discard it. The peer will realise that we
1838 are using the new key when they see our data packets.
1839 Until then the peer's data packets to us get discarded. */
1840 if (st->state==SITE_SENTMSG4) {
1841 if (process_msg5(st,buf,source,st->new_transform)) {
1842 transport_setup_msgok(st,source);
1843 enter_new_state(st,SITE_RUN);
1845 slog(st,LOG_SEC,"invalid MSG5");
1847 } else if (st->state==SITE_RUN) {
1848 if (process_msg5(st,buf,source,st->current.transform)) {
1849 slog(st,LOG_DROP,"got MSG5, retransmitting MSG6");
1850 transport_setup_msgok(st,source);
1851 create_msg6(st,st->current.transform,
1852 st->current.remote_session_id);
1853 transport_xmit(st,&st->peers,&st->buffer,True);
1854 BUF_FREE(&st->buffer);
1856 slog(st,LOG_SEC,"invalid MSG5 (in state RUN)");
1859 slog(st,LOG_UNEXPECTED,"unexpected MSG5");
1863 /* Setup packet: expected only in state SENTMSG5 */
1864 if (st->state!=SITE_SENTMSG5) {
1865 slog(st,LOG_UNEXPECTED,"unexpected MSG6");
1866 } else if (process_msg6(st,buf,source)) {
1867 BUF_FREE(&st->buffer); /* Free message 5 */
1868 transport_setup_msgok(st,source);
1869 activate_new_key(st);
1871 slog(st,LOG_SEC,"invalid MSG6");
1875 slog(st,LOG_SEC,"received message of unknown type 0x%08x",
1886 static void site_control(void *vst, bool_t run)
1888 struct site *st=vst;
1889 if (run) enter_state_run(st);
1890 else enter_state_stop(st);
1893 static void site_phase_hook(void *sst, uint32_t newphase)
1895 struct site *st=sst;
1897 /* The program is shutting down; tell our peer */
1898 send_msg7(st,"shutting down");
1901 static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context,
1904 static uint32_t index_sequence;
1910 st=safe_malloc(sizeof(*st),"site_apply");
1912 st->cl.description="site";
1913 st->cl.type=CL_SITE;
1915 st->cl.interface=&st->ops;
1917 st->ops.control=site_control;
1918 st->ops.status=site_status;
1920 /* First parameter must be a dict */
1921 item=list_elem(args,0);
1922 if (!item || item->type!=t_dict)
1923 cfgfatal(loc,"site","parameter must be a dictionary\n");
1925 dict=item->data.dict;
1926 st->localname=dict_read_string(dict, "local-name", True, "site", loc);
1927 st->remotename=dict_read_string(dict, "name", True, "site", loc);
1929 st->peer_mobile=dict_read_bool(dict,"mobile",False,"site",loc,False);
1931 dict_read_bool(dict,"local-mobile",False,"site",loc,False);
1933 /* Sanity check (which also allows the 'sites' file to include
1934 site() closures for all sites including our own): refuse to
1935 talk to ourselves */
1936 if (strcmp(st->localname,st->remotename)==0) {
1937 Message(M_DEBUG,"site %s: local-name==name -> ignoring this site\n",
1939 if (st->peer_mobile != st->local_mobile)
1940 cfgfatal(loc,"site","site %s's peer-mobile=%d"
1941 " but our local-mobile=%d\n",
1942 st->localname, st->peer_mobile, st->local_mobile);
1946 if (st->peer_mobile && st->local_mobile) {
1947 Message(M_WARNING,"site %s: site is mobile but so are we"
1948 " -> ignoring this site\n", st->remotename);
1953 assert(index_sequence < 0xffffffffUL);
1954 st->index = ++index_sequence;
1955 st->local_capabilities = 0;
1956 st->netlink=find_cl_if(dict,"link",CL_NETLINK,True,"site",loc);
1958 #define GET_CLOSURE_LIST(dictkey,things,nthings,CL_TYPE) do{ \
1959 list_t *things##_cfg=dict_lookup(dict,dictkey); \
1960 if (!things##_cfg) \
1961 cfgfatal(loc,"site","closure list \"%s\" not found\n",dictkey); \
1962 st->nthings=list_length(things##_cfg); \
1963 st->things=safe_malloc_ary(sizeof(*st->things),st->nthings,dictkey "s"); \
1964 assert(st->nthings); \
1965 for (i=0; i<st->nthings; i++) { \
1966 item_t *item=list_elem(things##_cfg,i); \
1967 if (item->type!=t_closure) \
1968 cfgfatal(loc,"site","%s is not a closure\n",dictkey); \
1969 closure_t *cl=item->data.closure; \
1970 if (cl->type!=CL_TYPE) \
1971 cfgfatal(loc,"site","%s closure wrong type\n",dictkey); \
1972 st->things[i]=cl->interface; \
1976 GET_CLOSURE_LIST("comm",comms,ncomms,CL_COMM);
1978 st->resolver=find_cl_if(dict,"resolver",CL_RESOLVER,True,"site",loc);
1979 st->log=find_cl_if(dict,"log",CL_LOG,True,"site",loc);
1980 st->random=find_cl_if(dict,"random",CL_RANDOMSRC,True,"site",loc);
1982 st->privkey=find_cl_if(dict,"local-key",CL_RSAPRIVKEY,True,"site",loc);
1983 st->addresses=dict_read_string_array(dict,"address",False,"site",loc,0);
1985 st->remoteport=dict_read_number(dict,"port",True,"site",loc,0);
1986 else st->remoteport=0;
1987 st->pubkey=find_cl_if(dict,"key",CL_RSAPUBKEY,True,"site",loc);
1989 GET_CLOSURE_LIST("transform",transforms,ntransforms,CL_TRANSFORM);
1991 st->dh=find_cl_if(dict,"dh",CL_DH,True,"site",loc);
1992 st->hash=find_cl_if(dict,"hash",CL_HASH,True,"site",loc);
1994 #define DEFAULT(D) (st->peer_mobile || st->local_mobile \
1995 ? DEFAULT_MOBILE_##D : DEFAULT_##D)
1996 #define CFG_NUMBER(k,D) dict_read_number(dict,(k),False,"site",loc,DEFAULT(D));
1998 st->key_lifetime= CFG_NUMBER("key-lifetime", KEY_LIFETIME);
1999 st->setup_retries= CFG_NUMBER("setup-retries", SETUP_RETRIES);
2000 st->setup_retry_interval= CFG_NUMBER("setup-timeout", SETUP_RETRY_INTERVAL);
2001 st->wait_timeout= CFG_NUMBER("wait-time", WAIT_TIME);
2002 st->mtu_target= dict_read_number(dict,"mtu-target",False,"site",loc,0);
2004 st->mobile_peer_expiry= dict_read_number(
2005 dict,"mobile-peer-expiry",False,"site",loc,DEFAULT_MOBILE_PEER_EXPIRY);
2007 const char *peerskey= st->peer_mobile
2008 ? "mobile-peers-max" : "static-peers-max";
2009 st->transport_peers_max= dict_read_number(
2010 dict,peerskey,False,"site",loc,DEFAULT_MOBILE_PEERS_MAX);
2011 if (st->transport_peers_max<1 ||
2012 st->transport_peers_max>=MAX_PEER_ADDRS) {
2013 cfgfatal(loc,"site", "%s must be in range 1.."
2014 STRING(MAX_PEER_ADDRS) "\n", peerskey);
2017 if (st->key_lifetime < DEFAULT(KEY_RENEGOTIATE_GAP)*2)
2018 st->key_renegotiate_time=st->key_lifetime/2;
2020 st->key_renegotiate_time=st->key_lifetime-DEFAULT(KEY_RENEGOTIATE_GAP);
2021 st->key_renegotiate_time=dict_read_number(
2022 dict,"renegotiate-time",False,"site",loc,st->key_renegotiate_time);
2023 if (st->key_renegotiate_time > st->key_lifetime) {
2024 cfgfatal(loc,"site",
2025 "renegotiate-time must be less than key-lifetime\n");
2028 st->log_events=string_list_to_word(dict_lookup(dict,"log-events"),
2029 log_event_table,"site");
2031 st->resolving_count=0;
2032 st->allow_send_prod=0;
2034 st->tunname=safe_malloc(strlen(st->localname)+strlen(st->remotename)+5,
2036 sprintf(st->tunname,"%s<->%s",st->localname,st->remotename);
2038 /* The information we expect to see in incoming messages of type 1 */
2039 /* fixme: lots of unchecked overflows here, but the results are only
2040 corrupted packets rather than undefined behaviour */
2041 st->setup_priority=(strcmp(st->localname,st->remotename)>0);
2043 buffer_new(&st->buffer,SETUP_BUFFER_LEN);
2045 buffer_new(&st->scratch,SETUP_BUFFER_LEN);
2046 BUF_ALLOC(&st->scratch,"site:scratch");
2048 /* We are interested in poll(), but only for timeouts. We don't have
2049 any fds of our own. */
2050 register_for_poll(st, site_beforepoll, site_afterpoll, "site");
2053 st->remote_capabilities=0;
2054 st->chosen_transform=0;
2055 st->current.key_timeout=0;
2056 st->auxiliary_key.key_timeout=0;
2057 transport_peers_clear(st,&st->peers);
2058 transport_peers_clear(st,&st->setup_peers);
2059 /* XXX mlock these */
2060 st->dhsecret=safe_malloc(st->dh->len,"site:dhsecret");
2061 st->sharedsecretlen=st->sharedsecretallocd=0;
2064 for (i=0; i<st->ntransforms; i++) {
2065 struct transform_if *ti=st->transforms[i];
2066 uint32_t capbit = 1UL << ti->capab_transformnum;
2067 if (st->local_capabilities & capbit)
2068 slog(st,LOG_ERROR,"transformnum capability bit"
2069 " %d (%#"PRIx32") reused", ti->capab_transformnum, capbit);
2070 st->local_capabilities |= capbit;
2073 /* We need to register the remote networks with the netlink device */
2074 uint32_t netlink_mtu; /* local virtual interface mtu */
2075 st->netlink->reg(st->netlink->st, site_outgoing, st, &netlink_mtu);
2076 if (!st->mtu_target)
2077 st->mtu_target=netlink_mtu;
2079 for (i=0; i<st->ncomms; i++)
2080 st->comms[i]->request_notify(st->comms[i]->st, st, site_incoming);
2082 st->current.transform=0;
2083 st->auxiliary_key.transform=0;
2084 st->new_transform=0;
2085 st->auxiliary_is_new=0;
2087 enter_state_stop(st);
2089 add_hook(PHASE_SHUTDOWN,site_phase_hook,st);
2091 return new_closure(&st->cl);
2094 void site_module(dict_t *dict)
2096 add_closure(dict,"site",site_apply);
2100 /***** TRANSPORT PEERS definitions *****/
2102 static void transport_peers_debug(struct site *st, transport_peers *dst,
2103 const char *didwhat,
2104 int nargs, const struct comm_addr *args,
2109 if (!(st->log_events & LOG_PEER_ADDRS))
2110 return; /* an optimisation */
2112 slog(st, LOG_PEER_ADDRS, "peers (%s) %s nargs=%d => npeers=%d",
2113 (dst==&st->peers ? "data" :
2114 dst==&st->setup_peers ? "setup" : "UNKNOWN"),
2115 didwhat, nargs, dst->npeers);
2117 for (i=0, argp=(void*)args;
2119 i++, (argp+=stride?stride:sizeof(*args))) {
2120 const struct comm_addr *ca=(void*)argp;
2121 slog(st, LOG_PEER_ADDRS, " args: addrs[%d]=%s",
2122 i, comm_addr_to_string(ca));
2124 for (i=0; i<dst->npeers; i++) {
2125 struct timeval diff;
2126 timersub(tv_now,&dst->peers[i].last,&diff);
2127 const struct comm_addr *ca=&dst->peers[i].addr;
2128 slog(st, LOG_PEER_ADDRS, " peers: addrs[%d]=%s T-%ld.%06ld",
2129 i, comm_addr_to_string(ca),
2130 (unsigned long)diff.tv_sec, (unsigned long)diff.tv_usec);
2134 static bool_t transport_addrs_equal(const struct comm_addr *a,
2135 const struct comm_addr *b) {
2136 return !memcmp(a,b,sizeof(*a));
2139 static void transport_peers_expire(struct site *st, transport_peers *peers) {
2140 /* peers must be sorted first */
2141 int previous_peers=peers->npeers;
2142 struct timeval oldest;
2143 oldest.tv_sec = tv_now->tv_sec - st->mobile_peer_expiry;
2144 oldest.tv_usec = tv_now->tv_usec;
2145 while (peers->npeers>1 &&
2146 timercmp(&peers->peers[peers->npeers-1].last, &oldest, <))
2148 if (peers->npeers != previous_peers)
2149 transport_peers_debug(st,peers,"expire", 0,0,0);
2152 static bool_t transport_peer_record_one(struct site *st, transport_peers *peers,
2153 const struct comm_addr *ca,
2154 const struct timeval *tv) {
2155 /* returns false if output is full */
2158 if (peers->npeers > st->transport_peers_max)
2161 for (search=0; search<peers->npeers; search++)
2162 if (transport_addrs_equal(&peers->peers[search].addr, ca))
2165 peers->peers[peers->npeers].addr = *ca;
2166 peers->peers[peers->npeers].last = *tv;
2171 static void transport_record_peers(struct site *st, transport_peers *peers,
2172 const struct comm_addr *addrs, int naddrs,
2174 /* We add addrs into peers. The new entries end up at the front
2175 * and displace entries towards the end (perhaps even off the end).
2176 * Any existing matching entries are moved up to the front.
2177 * Caller must first call transport_peers_expire. */
2179 if (naddrs==1 && peers->npeers>=1 &&
2180 transport_addrs_equal(&addrs[0], &peers->peers[0].addr)) {
2181 /* optimisation, also avoids debug for trivial updates */
2182 peers->peers[0].last = *tv_now;
2186 int old_npeers=peers->npeers;
2187 transport_peers old_peers[old_npeers];
2188 memcpy(old_peers,peers->peers,sizeof(old_npeers));
2192 for (i=0; i<naddrs; i++) {
2193 if (!transport_peer_record_one(st,peers, &addrs[i], tv_now))
2196 for (i=0; i<old_npeers; i++) {
2197 const transport_peer *old=&old_peers->peers[i];
2198 if (!transport_peer_record_one(st,peers, &old->addr, &old->last))
2202 transport_peers_debug(st,peers,m, naddrs,addrs,0);
2205 static bool_t transport_compute_setupinit_peers(struct site *st,
2206 const struct comm_addr *configured_addrs /* 0 if none or not found */,
2207 int n_configured_addrs /* 0 if none or not found */,
2208 const struct comm_addr *incoming_packet_addr /* 0 if none */) {
2209 if (!n_configured_addrs && !incoming_packet_addr &&
2210 !transport_peers_valid(&st->peers))
2213 slog(st,LOG_SETUP_INIT,
2214 "using:%d configured addr(s);%s %d old peer addrs(es)",
2216 incoming_packet_addr ? " incoming packet address;" : "",
2219 /* Non-mobile peers try addresses until one is plausible. The
2220 * effect is that this code always tries first the configured
2221 * address if supplied, or otherwise the address of the incoming
2222 * PROD, or finally the existing data peer if one exists; this is
2225 transport_peers_copy(st,&st->setup_peers,&st->peers);
2226 transport_peers_expire(st,&st->setup_peers);
2228 if (incoming_packet_addr)
2229 transport_record_peers(st,&st->setup_peers,
2230 incoming_packet_addr,1, "incoming");
2232 if (n_configured_addrs)
2233 transport_record_peers(st,&st->setup_peers,
2234 configured_addrs,n_configured_addrs, "setupinit");
2236 assert(transport_peers_valid(&st->setup_peers));
2240 static void transport_setup_msgok(struct site *st, const struct comm_addr *a) {
2241 if (st->peer_mobile) {
2242 transport_peers_expire(st,&st->setup_peers);
2243 transport_record_peers(st,&st->setup_peers,a,1,"setupmsg");
2246 static void transport_data_msgok(struct site *st, const struct comm_addr *a) {
2247 if (st->peer_mobile) {
2248 transport_peers_expire(st,&st->setup_peers);
2249 transport_record_peers(st,&st->peers,a,1,"datamsg");
2253 static int transport_peers_valid(transport_peers *peers) {
2254 return peers->npeers;
2256 static void transport_peers_clear(struct site *st, transport_peers *peers) {
2258 transport_peers_debug(st,peers,"clear",0,0,0);
2260 static void transport_peers_copy(struct site *st, transport_peers *dst,
2261 const transport_peers *src) {
2262 dst->npeers=src->npeers;
2263 memcpy(dst->peers, src->peers, sizeof(*dst->peers) * dst->npeers);
2264 transport_peers_debug(st,dst,"copy",
2265 src->npeers, &src->peers->addr, sizeof(*src->peers));
2268 static void transport_resolve_complete(struct site *st,
2269 const struct comm_addr *addrs,
2271 transport_peers_expire(st,&st->peers);
2272 transport_record_peers(st,&st->peers,addrs,naddrs,"resolved data");
2273 transport_peers_expire(st,&st->setup_peers);
2274 transport_record_peers(st,&st->setup_peers,addrs,naddrs,"resolved setup");
2277 static void transport_resolve_complete_tardy(struct site *st,
2278 const struct comm_addr *addrs,
2280 transport_peers_expire(st,&st->peers);
2281 transport_record_peers(st,&st->peers,addrs,naddrs,"resolved tardily");
2284 static void transport_peers__copy_by_mask(transport_peer *out, int *nout_io,
2286 const transport_peers *inp) {
2287 /* out and in->peers may be the same region, or nonoverlapping */
2288 const transport_peer *in=inp->peers;
2290 for (slot=0; slot<inp->npeers; slot++) {
2291 if (!(mask & (1U << slot)))
2293 if (!(out==in && slot==*nout_io))
2294 memcpy(&out[*nout_io], &in[slot], sizeof(out[0]));
2299 void transport_xmit(struct site *st, transport_peers *peers,
2300 struct buffer_if *buf, bool_t candebug) {
2302 transport_peers_expire(st, peers);
2303 unsigned failed=0; /* bitmask */
2304 assert(MAX_PEER_ADDRS < sizeof(unsigned)*CHAR_BIT);
2307 for (slot=0; slot<peers->npeers; slot++) {
2308 transport_peer *peer=&peers->peers[slot];
2310 dump_packet(st, buf, &peer->addr, False);
2312 peer->addr.comm->sendmsg(peer->addr.comm->st, buf, &peer->addr);
2314 failed |= 1U << slot;
2317 if (ok && !st->peer_mobile)
2320 /* Now we need to demote/delete failing addrs: if we are mobile we
2321 * merely demote them; otherwise we delete them. */
2322 if (st->local_mobile) {
2323 unsigned expected = ((1U << nfailed)-1) << (peers->npeers-nfailed);
2324 /* `expected' has all the failures at the end already */
2325 if (failed != expected) {
2327 transport_peer failedpeers[nfailed];
2328 transport_peers__copy_by_mask(failedpeers, &fslot, failed,peers);
2329 assert(fslot == nfailed);
2331 transport_peers__copy_by_mask(peers->peers,&wslot,~failed,peers);
2332 assert(wslot+nfailed == peers->npeers);
2333 memcpy(peers->peers+wslot,failedpeers,sizeof(failedpeers));
2336 if (failed && peers->npeers > 1) {
2338 transport_peers__copy_by_mask(peers->peers,&wslot,~failed,peers);
2339 peers->npeers=wslot;
2344 /***** END of transport peers declarations *****/