1 // L2TPNS Clustering Stuff
3 char const *cvs_id_cluster
= "$Id: cluster.c,v 1.26.2.9 2005/05/23 12:48:17 bodea Exp $";
12 #include <sys/socket.h>
13 #include <netinet/in.h>
14 #include <arpa/inet.h>
15 #include <sys/ioctl.h>
31 * All cluster packets have the same format.
33 * One or more instances of
35 * a 32 bit 'extra' data dependant on the 'type'.
36 * zero or more bytes of structure data, dependant on the type.
41 int cluster_sockfd
= 0; // The filedescriptor for the cluster communications port.
43 in_addr_t my_address
= 0; // The network address of my ethernet port.
44 static int walk_session_number
= 0; // The next session to send when doing the slow table walk.
45 static int walk_tunnel_number
= 0; // The next tunnel to send when doing the slow table walk.
47 #define MAX_HEART_SIZE (8192) // Maximum size of heartbeat packet. Must be less than max IP packet size :)
48 #define MAX_CHANGES (MAX_HEART_SIZE/(sizeof(sessiont) + sizeof(int) ) - 2) // Assumes a session is the biggest type!
53 } cluster_changes
[MAX_CHANGES
]; // Queue of changed structures that need to go out when next heartbeat.
58 char data
[MAX_HEART_SIZE
];
59 } past_hearts
[HB_HISTORY_SIZE
]; // Ring buffer of heartbeats that we've recently sent out. Needed so
60 // we can re-transmit if needed.
67 } peers
[CLUSTER_MAX_SIZE
]; // List of all the peers we've heard from.
68 static int num_peers
; // Number of peers in list.
70 static int rle_decompress(uint8_t **src_p
, int ssize
, uint8_t *dst
, int dsize
);
71 static int rle_compress(uint8_t **src_p
, int ssize
, uint8_t *dst
, int dsize
);
74 // Create a listening socket
76 // This joins the cluster multi-cast group.
80 struct sockaddr_in addr
;
81 struct sockaddr_in interface_addr
;
86 config
->cluster_undefined_sessions
= MAXSESSION
-1;
87 config
->cluster_undefined_tunnels
= MAXTUNNEL
-1;
89 if (!config
->cluster_address
)
91 if (!*config
->cluster_interface
)
94 cluster_sockfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
96 memset(&addr
, 0, sizeof(addr
));
97 addr
.sin_family
= AF_INET
;
98 addr
.sin_port
= htons(CLUSTERPORT
);
99 addr
.sin_addr
.s_addr
= INADDR_ANY
;
100 setsockopt(cluster_sockfd
, SOL_SOCKET
, SO_REUSEADDR
, &addr
, sizeof(addr
));
102 opt
= fcntl(cluster_sockfd
, F_GETFL
, 0);
103 fcntl(cluster_sockfd
, F_SETFL
, opt
| O_NONBLOCK
);
105 if (bind(cluster_sockfd
, (void *) &addr
, sizeof(addr
)) < 0)
107 LOG(0, 0, 0, "Failed to bind cluster socket: %s\n", strerror(errno
));
111 strcpy(ifr
.ifr_name
, config
->cluster_interface
);
112 if (ioctl(cluster_sockfd
, SIOCGIFADDR
, &ifr
) < 0)
114 LOG(0, 0, 0, "Failed to get interface address for (%s): %s\n", config
->cluster_interface
, strerror(errno
));
118 memcpy(&interface_addr
, &ifr
.ifr_addr
, sizeof(interface_addr
));
119 my_address
= interface_addr
.sin_addr
.s_addr
;
121 // Join multicast group.
122 mreq
.imr_multiaddr
.s_addr
= config
->cluster_address
;
123 mreq
.imr_interface
= interface_addr
.sin_addr
;
126 opt
= 0; // Turn off multicast loopback.
127 setsockopt(cluster_sockfd
, IPPROTO_IP
, IP_MULTICAST_LOOP
, &opt
, sizeof(opt
));
129 if (setsockopt(cluster_sockfd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0)
131 LOG(0, 0, 0, "Failed to setsockopt (join mcast group): %s\n", strerror(errno
));
135 if (setsockopt(cluster_sockfd
, IPPROTO_IP
, IP_MULTICAST_IF
, &interface_addr
, sizeof(interface_addr
)) < 0)
137 LOG(0, 0, 0, "Failed to setsockopt (set mcast interface): %s\n", strerror(errno
));
141 config
->cluster_last_hb
= TIME
;
142 config
->cluster_seq_number
= -1;
144 return cluster_sockfd
;
149 // Send a chunk of data to the entire cluster (usually via the multicast
153 static int cluster_send_data(void *data
, int datalen
)
155 struct sockaddr_in addr
= {0};
157 if (!cluster_sockfd
) return -1;
158 if (!config
->cluster_address
) return 0;
160 addr
.sin_addr
.s_addr
= config
->cluster_address
;
161 addr
.sin_port
= htons(CLUSTERPORT
);
162 addr
.sin_family
= AF_INET
;
164 LOG(5, 0, 0, "Cluster send data: %d bytes\n", datalen
);
166 if (sendto(cluster_sockfd
, data
, datalen
, MSG_NOSIGNAL
, (void *) &addr
, sizeof(addr
)) < 0)
168 LOG(0, 0, 0, "sendto: %s\n", strerror(errno
));
176 // Add a chunk of data to a heartbeat packet.
177 // Maintains the format. Assumes that the caller
178 // has passed in a big enough buffer!
180 static void add_type(char **p
, int type
, int more
, char *data
, int size
)
182 *((uint32_t *) (*p
)) = type
;
183 *p
+= sizeof(uint32_t);
185 *((uint32_t *)(*p
)) = more
;
186 *p
+= sizeof(uint32_t);
188 if (data
&& size
> 0) {
189 memcpy(*p
, data
, size
);
194 // advertise our presence via BGP or gratuitous ARP
195 static void advertise(void)
199 bgp_enable_routing(1);
202 if (config
->send_garp
)
203 send_garp(config
->bind_address
); // Start taking traffic.
206 static void cluster_uptodate(void)
208 if (config
->cluster_iam_uptodate
)
211 if (config
->cluster_undefined_sessions
|| config
->cluster_undefined_tunnels
)
214 config
->cluster_iam_uptodate
= 1;
216 LOG(0, 0, 0, "Now uptodate with master.\n");
221 // Send a unicast UDP packet to a peer with 'data' as the
224 static int peer_send_data(in_addr_t peer
, char *data
, int size
)
226 struct sockaddr_in addr
= {0};
228 if (!cluster_sockfd
) return -1;
229 if (!config
->cluster_address
) return 0;
234 addr
.sin_addr
.s_addr
= peer
;
235 addr
.sin_port
= htons(CLUSTERPORT
);
236 addr
.sin_family
= AF_INET
;
238 LOG_HEX(5, "Peer send", data
, size
);
240 if (sendto(cluster_sockfd
, data
, size
, MSG_NOSIGNAL
, (void *) &addr
, sizeof(addr
)) < 0)
242 LOG(0, 0, 0, "sendto: %s\n", strerror(errno
));
250 // Send a structured message to a peer with a single element of type 'type'.
252 static int peer_send_message(in_addr_t peer
, int type
, int more
, char *data
, int size
)
254 char buf
[65536]; // Vast overkill.
257 LOG(4, 0, 0, "Sending message to peer (type %d, more %d, size %d)\n", type
, more
, size
);
258 add_type(&p
, type
, more
, data
, size
);
260 return peer_send_data(peer
, buf
, (p
-buf
) );
264 // Forward a state changing packet to the master.
266 // The master just processes the payload as if it had
267 // received it off the tun device.
269 int master_forward_packet(char *data
, int size
, in_addr_t addr
, int port
)
271 char buf
[65536]; // Vast overkill.
274 if (!config
->cluster_master_address
) // No election has been held yet. Just skip it.
277 LOG(4, 0, 0, "Forwarding packet from %s to master (size %d)\n", fmtaddr(addr
, 0), size
);
280 add_type(&p
, C_FORWARD
, addr
, (char *) &port
, sizeof(port
));
281 memcpy(p
, data
, size
);
284 return peer_send_data(config
->cluster_master_address
, buf
, (p
- buf
));
288 // Forward a throttled packet to the master for handling.
290 // The master just drops the packet into the appropriate
291 // token bucket queue, and lets normal processing take care
294 int master_throttle_packet(int tbfid
, char *data
, int size
)
296 char buf
[65536]; // Vast overkill.
299 if (!config
->cluster_master_address
) // No election has been held yet. Just skip it.
302 LOG(4, 0, 0, "Throttling packet master (size %d, tbfid %d)\n", size
, tbfid
);
304 add_type(&p
, C_THROTTLE
, tbfid
, data
, size
);
306 return peer_send_data(config
->cluster_master_address
, buf
, (p
-buf
) );
311 // Forward a walled garden packet to the master for handling.
313 // The master just writes the packet straight to the tun
314 // device (where is will normally loop through the
315 // firewall rules, and come back in on the tun device)
317 // (Note that this must be called with the tun header
318 // as the start of the data).
319 int master_garden_packet(sessionidt s
, char *data
, int size
)
321 char buf
[65536]; // Vast overkill.
324 if (!config
->cluster_master_address
) // No election has been held yet. Just skip it.
327 LOG(4, 0, 0, "Walled garden packet to master (size %d)\n", size
);
329 add_type(&p
, C_GARDEN
, s
, data
, size
);
331 return peer_send_data(config
->cluster_master_address
, buf
, (p
-buf
));
336 // Send a chunk of data as a heartbeat..
337 // We save it in the history buffer as we do so.
339 static void send_heartbeat(int seq
, char *data
, int size
)
343 if (size
> sizeof(past_hearts
[0].data
))
345 LOG(0, 0, 0, "Tried to heartbeat something larger than the maximum packet!\n");
349 i
= seq
% HB_HISTORY_SIZE
;
350 past_hearts
[i
].seq
= seq
;
351 past_hearts
[i
].size
= size
;
352 memcpy(&past_hearts
[i
].data
, data
, size
); // Save it.
353 cluster_send_data(data
, size
);
357 // Send an 'i am alive' message to every machine in the cluster.
359 void cluster_send_ping(time_t basetime
)
361 char buff
[100 + sizeof(pingt
)];
365 if (config
->cluster_iam_master
&& basetime
) // We're heartbeating so no need to ping.
368 LOG(5, 0, 0, "Sending cluster ping...\n");
371 x
.addr
= config
->bind_address
;
372 x
.undef
= config
->cluster_undefined_sessions
+ config
->cluster_undefined_tunnels
;
373 x
.basetime
= basetime
;
375 add_type(&p
, C_PING
, basetime
, (char *) &x
, sizeof(x
));
376 cluster_send_data(buff
, (p
-buff
) );
380 // Walk the session counters looking for non-zero ones to send
381 // to the master. We send up to 600 of them at one time.
382 // We examine a maximum of 3000 sessions.
383 // (50k max session should mean that we normally
384 // examine the entire session table every 25 seconds).
386 #define MAX_B_RECS (600)
387 void master_update_counts(void)
390 bytest b
[MAX_B_RECS
+1];
392 if (config
->cluster_iam_master
) // Only happens on the slaves.
395 if (!config
->cluster_master_address
) // If we don't have a master, skip it for a while.
398 i
= MAX_B_RECS
* 5; // Examine max 2000 sessions;
399 if (config
->cluster_highest_sessionid
> i
)
400 i
= config
->cluster_highest_sessionid
;
402 for ( c
= 0; i
> 0 ; --i
) {
403 // Next session to look at.
404 walk_session_number
++;
405 if ( walk_session_number
> config
->cluster_highest_sessionid
)
406 walk_session_number
= 1;
408 if (!sess_local
[walk_session_number
].cin
&& !sess_local
[walk_session_number
].cout
)
409 continue; // Unused. Skip it.
411 b
[c
].sid
= walk_session_number
;
412 b
[c
].in
= sess_local
[walk_session_number
].cin
;
413 b
[c
].out
= sess_local
[walk_session_number
].cout
;
415 if (++c
> MAX_B_RECS
) // Send a max of 400 elements in a packet.
419 sess_local
[walk_session_number
].cin
= sess_local
[walk_session_number
].cout
= 0;
422 if (!c
) // Didn't find any that changes. Get out of here!
426 // Forward the data to the master.
427 LOG(4, 0, 0, "Sending byte counters to master (%d elements)\n", c
);
428 peer_send_message(config
->cluster_master_address
, C_BYTES
, c
, (char *) &b
, sizeof(b
[0]) * c
);
433 // On the master, check how our slaves are going. If
434 // one of them's not up-to-date we'll heartbeat faster.
435 // If we don't have any of them, then we need to turn
436 // on our own packet handling!
438 void cluster_check_slaves(void)
441 static int have_peers
= 0;
442 int had_peers
= have_peers
;
445 if (!config
->cluster_iam_master
)
446 return; // Only runs on the master...
448 config
->cluster_iam_uptodate
= 1; // cleared in loop below
450 for (i
= have_peers
= 0; i
< num_peers
; i
++)
452 if ((peers
[i
].timestamp
+ config
->cluster_hb_timeout
) < t
)
453 continue; // Stale peer! Skip them.
455 if (!peers
[i
].basetime
)
456 continue; // Shutdown peer! Skip them.
458 if (peers
[i
].uptodate
)
461 if (!peers
[i
].uptodate
)
462 config
->cluster_iam_uptodate
= 0; // Start fast heartbeats
466 // in a cluster, withdraw/add routes when we get a peer/lose all peers
467 if (bgp_configured
&& have_peers
!= had_peers
)
468 bgp_enable_routing(!have_peers
);
473 // Check that we have a master. If it's been too
474 // long since we heard from a master then hold an election.
476 void cluster_check_master(void)
478 int i
, count
, tcount
, high_unique_id
= 0;
481 static int probed
= 0;
483 if (config
->cluster_iam_master
)
484 return; // Only runs on the slaves...
486 // If the master is late (missed 2 hearbeats by a second and a
487 // hair) it may be that the switch has dropped us from the
488 // multicast group, try unicasting probes to the master
489 // which will hopefully respond with a unicast heartbeat that
490 // will allow us to limp along until the querier next runs.
491 if (config
->cluster_master_address
492 && TIME
> (config
->cluster_last_hb
+ 2 * config
->cluster_hb_interval
+ 11))
494 if (!probed
|| (TIME
> (probed
+ 2 * config
->cluster_hb_interval
)))
497 LOG(1, 0, 0, "Heartbeat from master %.1fs late, probing...\n",
498 0.1 * (TIME
- (config
->cluster_last_hb
+ config
->cluster_hb_interval
)));
500 peer_send_message(config
->cluster_master_address
,
501 C_LASTSEEN
, config
->cluster_seq_number
, NULL
, 0);
503 } else { // We got a recent heartbeat; reset the probe flag.
507 if (TIME
< (config
->cluster_last_hb
+ config
->cluster_hb_timeout
))
508 return; // Everything's ok!
510 config
->cluster_last_hb
= TIME
+ 1; // Just the one election thanks.
512 LOG(0, 0, 0, "Master timed out! Holding election...\n");
514 for (i
= 0; i
< num_peers
; i
++)
516 if ((peers
[i
].timestamp
+ config
->cluster_hb_timeout
) < t
)
517 continue; // Stale peer! Skip them.
519 if (!peers
[i
].basetime
)
520 continue; // Shutdown peer! Skip them.
522 if (peers
[i
].basetime
< basetime
) {
523 LOG(1, 0, 0, "Expecting %s to become master\n", fmtaddr(peers
[i
].peer
, 0));
524 return; // They'll win the election. Get out of here.
527 if (peers
[i
].basetime
== basetime
&&
528 peers
[i
].peer
> my_address
) {
529 LOG(1, 0, 0, "Expecting %s to become master\n", fmtaddr(peers
[i
].peer
, 0));
530 return; // They'll win the election. Wait for them to come up.
534 // Wow. it's been ages since I last heard a heartbeat
535 // and I'm better than an of my peers so it's time
536 // to become a master!!!
538 config
->cluster_iam_master
= 1;
539 config
->cluster_master_address
= 0;
541 LOG(0, 0, 0, "I am declaring myself the master!\n");
543 if (config
->cluster_seq_number
== -1)
544 config
->cluster_seq_number
= 0;
547 // Go through and mark all the tunnels as defined.
548 // Count the highest used tunnel number as well.
550 config
->cluster_highest_tunnelid
= 0;
551 for (i
= 0, tcount
= 0; i
< MAXTUNNEL
; ++i
) {
552 if (tunnel
[i
].state
== TUNNELUNDEF
)
553 tunnel
[i
].state
= TUNNELFREE
;
555 if (tunnel
[i
].state
!= TUNNELFREE
&& i
> config
->cluster_highest_tunnelid
)
556 config
->cluster_highest_tunnelid
= i
;
560 // Go through and mark all the sessions as being defined.
561 // reset the idle timeouts.
562 // add temporary byte counters to permanent ones.
563 // Re-string the free list.
564 // Find the ID of the highest session.
567 config
->cluster_highest_sessionid
= 0;
568 for (i
= 0, count
= 0; i
< MAXSESSION
; ++i
) {
569 if (session
[i
].tunnel
== T_UNDEF
) {
570 session
[i
].tunnel
= T_FREE
;
574 if (!session
[i
].opened
) { // Unused session. Add to free list.
575 memset(&session
[i
], 0, sizeof(session
[i
]));
576 session
[i
].tunnel
= T_FREE
;
577 session
[last_free
].next
= i
;
583 // Reset idle timeouts..
584 session
[i
].last_packet
= time_now
;
586 // Reset die relative to our uptime rather than the old master's
587 if (session
[i
].die
) session
[i
].die
= TIME
;
589 // Accumulate un-sent byte counters.
590 session
[i
].cin
+= sess_local
[i
].cin
;
591 session
[i
].cout
+= sess_local
[i
].cout
;
592 session
[i
].total_cin
+= sess_local
[i
].cin
;
593 session
[i
].total_cout
+= sess_local
[i
].cout
;
595 sess_local
[i
].cin
= sess_local
[i
].cout
= 0;
597 session
[i
].radius
= 0; // Reset authentication as the radius blocks aren't up to date.
599 if (session
[i
].unique_id
>= high_unique_id
) // This is different to the index into the session table!!!
600 high_unique_id
= session
[i
].unique_id
+1;
602 session
[i
].tbf_in
= session
[i
].tbf_out
= 0; // Remove stale pointers from old master.
603 throttle_session(i
, session
[i
].throttle_in
, session
[i
].throttle_out
);
605 config
->cluster_highest_sessionid
= i
;
608 session
[last_free
].next
= 0; // End of chain.
609 last_id
= high_unique_id
; // Keep track of the highest used session ID.
613 rebuild_address_pool();
615 // If we're not the very first master, this is a big issue!
617 LOG(0, 0, 0, "Warning: Fixed %d uninitialized sessions in becoming master!\n", count
);
619 config
->cluster_undefined_sessions
= 0;
620 config
->cluster_undefined_tunnels
= 0;
621 config
->cluster_iam_uptodate
= 1; // assume all peers are up-to-date
623 if (!num_peers
) // lone master
626 else if (bgp_configured
)
627 bgp_enable_routing(0);
631 // FIXME. We need to fix up the tunnel control message
632 // queue here! There's a number of other variables we
633 // should also update.
638 // Check that our session table is validly matching what the
639 // master has in mind.
641 // In particular, if we have too many sessions marked 'undefined'
642 // we fix it up here, and we ensure that the 'first free session'
645 static void cluster_check_sessions(int highsession
, int freesession_ptr
, int hightunnel
)
649 sessionfree
= freesession_ptr
; // Keep the freesession ptr valid.
651 if (config
->cluster_iam_uptodate
)
654 if (highsession
> config
->cluster_undefined_sessions
&& hightunnel
> config
->cluster_undefined_tunnels
)
657 // Clear out defined sessions, counting the number of
659 config
->cluster_undefined_sessions
= 0;
660 for (i
= 1 ; i
< MAXSESSION
; ++i
) {
661 if (i
> highsession
) {
662 if (session
[i
].tunnel
== T_UNDEF
) session
[i
].tunnel
= T_FREE
; // Defined.
666 if (session
[i
].tunnel
== T_UNDEF
)
667 ++config
->cluster_undefined_sessions
;
670 // Clear out defined tunnels, counting the number of
672 config
->cluster_undefined_tunnels
= 0;
673 for (i
= 1 ; i
< MAXTUNNEL
; ++i
) {
674 if (i
> hightunnel
) {
675 if (tunnel
[i
].state
== TUNNELUNDEF
) tunnel
[i
].state
= TUNNELFREE
; // Defined.
679 if (tunnel
[i
].state
== TUNNELUNDEF
)
680 ++config
->cluster_undefined_tunnels
;
684 if (config
->cluster_undefined_sessions
|| config
->cluster_undefined_tunnels
) {
685 LOG(2, 0, 0, "Cleared undefined sessions/tunnels. %d sess (high %d), %d tunn (high %d)\n",
686 config
->cluster_undefined_sessions
, highsession
, config
->cluster_undefined_tunnels
, hightunnel
);
690 // Are we up to date?
692 if (!config
->cluster_iam_uptodate
)
696 static int hb_add_type(char **p
, int type
, int id
)
699 case C_CSESSION
: { // Compressed C_SESSION.
700 uint8_t c
[sizeof(sessiont
) * 2]; // Bigger than worst case.
701 uint8_t *d
= (uint8_t *) &session
[id
];
705 size
= rle_compress( &d
, sizeof(sessiont
), c
, sizeof(c
) );
707 // Did we compress the full structure, and is the size actually
709 if ( (d
- orig
) == sizeof(sessiont
) && size
< sizeof(sessiont
) ) {
710 add_type(p
, C_CSESSION
, id
, (char *) c
, size
);
713 // Failed to compress : Fall through.
715 case C_SESSION
: add_type(p
, C_SESSION
, id
,
716 (char *) &session
[id
], sizeof(sessiont
));
719 case C_CTUNNEL
: { // Compressed C_TUNNEL
720 uint8_t c
[sizeof(tunnelt
) * 2]; // Bigger than worst case.
721 uint8_t *d
= (uint8_t *) &tunnel
[id
];
725 size
= rle_compress( &d
, sizeof(tunnelt
), c
, sizeof(c
) );
727 // Did we compress the full structure, and is the size actually
729 if ( (d
- orig
) == sizeof(tunnelt
) && size
< sizeof(tunnelt
) ) {
730 add_type(p
, C_CTUNNEL
, id
, c
, size
);
733 // Failed to compress : Fall through.
735 case C_TUNNEL
: add_type(p
, C_TUNNEL
, id
,
736 (char *) &tunnel
[id
], sizeof(tunnelt
));
739 LOG(0, 0, 0, "Found an invalid type in heart queue! (%d)\n", type
);
747 // Send a heartbeat, incidently sending out any queued changes..
749 void cluster_heartbeat()
751 int i
, count
= 0, tcount
= 0;
752 char buff
[MAX_HEART_SIZE
+ sizeof(heartt
) + sizeof(int) ];
756 if (!config
->cluster_iam_master
) // Only the master does this.
759 config
->cluster_table_version
+= config
->cluster_num_changes
;
761 // Fill out the heartbeat header.
762 memset(&h
, 0, sizeof(h
));
764 h
.version
= HB_VERSION
;
765 h
.seq
= config
->cluster_seq_number
;
766 h
.basetime
= basetime
;
767 h
.clusterid
= config
->bind_address
; // Will this do??
768 h
.basetime
= basetime
;
769 h
.highsession
= config
->cluster_highest_sessionid
;
770 h
.freesession
= sessionfree
;
771 h
.hightunnel
= config
->cluster_highest_tunnelid
;
772 h
.size_sess
= sizeof(sessiont
); // Just in case.
773 h
.size_tunn
= sizeof(tunnelt
);
774 h
.interval
= config
->cluster_hb_interval
;
775 h
.timeout
= config
->cluster_hb_timeout
;
776 h
.table_version
= config
->cluster_table_version
;
778 add_type(&p
, C_HEARTBEAT
, HB_VERSION
, (char *) &h
, sizeof(h
));
780 for (i
= 0; i
< config
->cluster_num_changes
; ++i
) {
781 hb_add_type(&p
, cluster_changes
[i
].type
, cluster_changes
[i
].id
);
784 if (p
> (buff
+ sizeof(buff
))) { // Did we somehow manage to overun the buffer?
785 LOG(0, 0, 0, "FATAL: Overran the heartbeat buffer! This is fatal. Exiting. (size %d)\n", (int) (p
- buff
));
791 // Fill out the packet with sessions from the session table...
792 // (not forgetting to leave space so we can get some tunnels in too )
793 while ( (p
+ sizeof(uint32_t) * 2 + sizeof(sessiont
) * 2 ) < (buff
+ MAX_HEART_SIZE
) ) {
795 if (!walk_session_number
) // session #0 isn't valid.
796 ++walk_session_number
;
798 if (count
>= config
->cluster_highest_sessionid
) // If we're a small cluster, don't go wild.
801 hb_add_type(&p
, C_CSESSION
, walk_session_number
);
802 walk_session_number
= (1+walk_session_number
)%(config
->cluster_highest_sessionid
+1); // +1 avoids divide by zero.
804 ++count
; // Count the number of extra sessions we're sending.
808 // Fill out the packet with tunnels from the tunnel table...
809 // This effectively means we walk the tunnel table more quickly
810 // than the session table. This is good because stuffing up a
811 // tunnel is a much bigger deal than stuffing up a session.
813 while ( (p
+ sizeof(uint32_t) * 2 + sizeof(tunnelt
) ) < (buff
+ MAX_HEART_SIZE
) ) {
815 if (!walk_tunnel_number
) // tunnel #0 isn't valid.
816 ++walk_tunnel_number
;
818 if (tcount
>= config
->cluster_highest_tunnelid
)
821 hb_add_type(&p
, C_CTUNNEL
, walk_tunnel_number
);
822 walk_tunnel_number
= (1+walk_tunnel_number
)%(config
->cluster_highest_tunnelid
+1); // +1 avoids divide by zero.
828 // Did we do something wrong?
829 if (p
> (buff
+ sizeof(buff
))) { // Did we somehow manage to overun the buffer?
830 LOG(0, 0, 0, "Overran the heartbeat buffer now! This is fatal. Exiting. (size %d)\n", (int) (p
- buff
));
835 LOG(3, 0, 0, "Sending v%d heartbeat #%d, change #%" PRIu64
" with %d changes "
836 "(%d x-sess, %d x-tunnels, %d highsess, %d hightun, size %d)\n",
837 HB_VERSION
, h
.seq
, h
.table_version
, config
->cluster_num_changes
,
838 count
, tcount
, config
->cluster_highest_sessionid
,
839 config
->cluster_highest_tunnelid
, (int) (p
- buff
));
841 config
->cluster_num_changes
= 0;
843 send_heartbeat(h
.seq
, buff
, (p
-buff
) ); // Send out the heartbeat to the cluster, keeping a copy of it.
845 config
->cluster_seq_number
= (config
->cluster_seq_number
+1)%HB_MAX_SEQ
; // Next seq number to use.
849 // A structure of type 'type' has changed; Add it to the queue to send.
851 static int type_changed(int type
, int id
)
855 for (i
= 0 ; i
< config
->cluster_num_changes
; ++i
)
856 if ( cluster_changes
[i
].id
== id
&&
857 cluster_changes
[i
].type
== type
)
858 return 0; // Already marked for change.
860 cluster_changes
[i
].type
= type
;
861 cluster_changes
[i
].id
= id
;
862 ++config
->cluster_num_changes
;
864 if (config
->cluster_num_changes
> MAX_CHANGES
)
865 cluster_heartbeat(); // flush now
871 // A particular session has been changed!
872 int cluster_send_session(int sid
)
874 if (!config
->cluster_iam_master
) {
875 LOG(0, sid
, 0, "I'm not a master, but I just tried to change a session!\n");
879 return type_changed(C_CSESSION
, sid
);
882 // A particular tunnel has been changed!
883 int cluster_send_tunnel(int tid
)
885 if (!config
->cluster_iam_master
) {
886 LOG(0, 0, tid
, "I'm not a master, but I just tried to change a tunnel!\n");
890 return type_changed(C_CTUNNEL
, tid
);
895 // We're a master, and a slave has just told us that it's
896 // missed a packet. We'll resend it every packet since
897 // the last one it's seen.
899 static int cluster_catchup_slave(int seq
, in_addr_t slave
)
904 LOG(1, 0, 0, "Slave %s sent LASTSEEN with seq %d\n", fmtaddr(slave
, 0), seq
);
905 if (!config
->cluster_iam_master
) {
906 LOG(1, 0, 0, "Got LASTSEEN but I'm not a master! Redirecting it to %s.\n",
907 fmtaddr(config
->cluster_master_address
, 0));
909 peer_send_message(slave
, C_MASTER
, config
->cluster_master_address
, NULL
, 0);
913 diff
= config
->cluster_seq_number
- seq
; // How many packet do we need to send?
917 if (diff
>= HB_HISTORY_SIZE
) { // Ouch. We don't have the packet to send it!
918 LOG(0, 0, 0, "A slave asked for message %d when our seq number is %d. Killing it.\n",
919 seq
, config
->cluster_seq_number
);
920 return peer_send_message(slave
, C_KILL
, seq
, NULL
, 0);// Kill the slave. Nothing else to do.
923 LOG(1, 0, 0, "Sending %d catchup packets to slave %s\n", diff
, fmtaddr(slave
, 0) );
925 // Now resend every packet that it missed, in order.
926 while (seq
!= config
->cluster_seq_number
) {
927 s
= seq
% HB_HISTORY_SIZE
;
928 if (seq
!= past_hearts
[s
].seq
) {
929 LOG(0, 0, 0, "Tried to re-send heartbeat for %s but %d doesn't match %d! (%d,%d)\n",
930 fmtaddr(slave
, 0), seq
, past_hearts
[s
].seq
, s
, config
->cluster_seq_number
);
931 return -1; // What to do here!?
933 peer_send_data(slave
, past_hearts
[s
].data
, past_hearts
[s
].size
);
934 seq
= (seq
+1)%HB_MAX_SEQ
; // Increment to next seq number.
936 return 0; // All good!
940 // We've heard from another peer! Add it to the list
941 // that we select from at election time.
943 static int cluster_add_peer(in_addr_t peer
, time_t basetime
, pingt
*pp
, int size
)
949 // Allow for backward compatability.
950 // Just the ping packet into a new structure to allow
951 // for the possibility that we might have received
952 // more or fewer elements than we were expecting.
953 if (size
> sizeof(p
))
956 memset( (void *) &p
, 0, sizeof(p
) );
957 memcpy( (void *) &p
, (void *) pp
, size
);
960 if (clusterid
!= config
->bind_address
)
963 LOG(4, 0, 0, "Skipping ping from %s (different cluster)\n", fmtaddr(peer
, 0));
967 for (i
= 0; i
< num_peers
; ++i
)
969 if (peers
[i
].peer
!= peer
)
972 // This peer already exists. Just update the timestamp.
973 peers
[i
].basetime
= basetime
;
974 peers
[i
].timestamp
= TIME
;
975 peers
[i
].uptodate
= !p
.undef
;
979 // Is this the master shutting down??
980 if (peer
== config
->cluster_master_address
) {
981 LOG(3, 0, 0, "Master %s %s\n", fmtaddr(config
->cluster_master_address
, 0),
982 basetime
? "has restarted!" : "shutting down...");
984 config
->cluster_master_address
= 0;
985 config
->cluster_last_hb
= 0; // Force an election.
986 cluster_check_master();
992 LOG(4, 0, 0, "Adding %s as a peer\n", fmtaddr(peer
, 0));
994 // Not found. Is there a stale slot to re-use?
995 for (i
= 0; i
< num_peers
; ++i
)
997 if (!peers
[i
].basetime
) // Shutdown
1000 if ((peers
[i
].timestamp
+ config
->cluster_hb_timeout
* 10) < TIME
) // Stale.
1004 if (i
>= CLUSTER_MAX_SIZE
)
1007 LOG(0, 0, 0, "Tried to add %s as a peer, but I already have %d of them!\n", fmtaddr(peer
, 0), i
);
1011 peers
[i
].peer
= peer
;
1012 peers
[i
].basetime
= basetime
;
1013 peers
[i
].timestamp
= TIME
;
1014 peers
[i
].uptodate
= !p
.undef
;
1018 LOG(1, 0, 0, "Added %s as a new peer. Now %d peers\n", fmtaddr(peer
, 0), num_peers
);
1024 // A slave responds with C_MASTER when it gets a message which should have gone to a master.
1025 static int cluster_set_master(in_addr_t peer
, in_addr_t master
)
1027 if (config
->cluster_iam_master
) // Sanity...
1030 LOG(3, 0, 0, "Peer %s set the master to %s...\n", fmtaddr(peer
, 0),
1031 fmtaddr(master
, 1));
1033 config
->cluster_master_address
= master
;
1034 cluster_check_master();
1038 /* Handle the slave updating the byte counters for the master. */
1040 // Note that we don't mark the session as dirty; We rely on
1041 // the slow table walk to propogate this back out to the slaves.
1043 static int cluster_handle_bytes(char *data
, int size
)
1047 b
= (bytest
*) data
;
1049 LOG(3, 0, 0, "Got byte counter update (size %d)\n", size
);
1051 /* Loop around, adding the byte
1052 counts to each of the sessions. */
1054 while (size
>= sizeof(*b
) ) {
1055 if (b
->sid
> MAXSESSION
) {
1056 LOG(0, 0, 0, "Got C_BYTES with session #%d!\n", b
->sid
);
1057 return -1; /* Abort processing */
1060 session
[b
->sid
].total_cin
+= b
->in
;
1061 session
[b
->sid
].total_cout
+= b
->out
;
1063 session
[b
->sid
].cin
+= b
->in
;
1064 session
[b
->sid
].cout
+= b
->out
;
1067 session
[b
->sid
].last_packet
= time_now
; // Reset idle timer!
1074 LOG(0, 0, 0, "Got C_BYTES with %d bytes of trailing junk!\n", size
);
1080 // Handle receiving a session structure in a heartbeat packet.
1082 static int cluster_recv_session(int more
, uint8_t *p
)
1084 if (more
>= MAXSESSION
) {
1085 LOG(0, 0, 0, "DANGER: Received a heartbeat session id > MAXSESSION!\n");
1089 if (session
[more
].tunnel
== T_UNDEF
) {
1090 if (config
->cluster_iam_uptodate
) { // Sanity.
1091 LOG(0, 0, 0, "I thought I was uptodate but I just found an undefined session!\n");
1093 --config
->cluster_undefined_sessions
;
1097 load_session(more
, (sessiont
*) p
); // Copy session into session table..
1099 LOG(5, more
, 0, "Received session update (%d undef)\n", config
->cluster_undefined_sessions
);
1101 if (!config
->cluster_iam_uptodate
)
1102 cluster_uptodate(); // Check to see if we're up to date.
1107 static int cluster_recv_tunnel(int more
, uint8_t *p
)
1109 if (more
>= MAXTUNNEL
) {
1110 LOG(0, 0, 0, "DANGER: Received a tunnel session id > MAXTUNNEL!\n");
1114 if (tunnel
[more
].state
== TUNNELUNDEF
) {
1115 if (config
->cluster_iam_uptodate
) { // Sanity.
1116 LOG(0, 0, 0, "I thought I was uptodate but I just found an undefined tunnel!\n");
1118 --config
->cluster_undefined_tunnels
;
1122 memcpy(&tunnel
[more
], p
, sizeof(tunnel
[more
]) );
1125 // Clear tunnel control messages. These are dynamically allocated.
1126 // If we get unlucky, this may cause the tunnel to drop!
1128 tunnel
[more
].controls
= tunnel
[more
].controle
= NULL
;
1129 tunnel
[more
].controlc
= 0;
1131 LOG(5, 0, more
, "Received tunnel update\n");
1133 if (!config
->cluster_iam_uptodate
)
1134 cluster_uptodate(); // Check to see if we're up to date.
1141 // Process a heartbeat..
1143 // v3: added interval, timeout
1144 // v4: added table_version
1145 static int cluster_process_heartbeat(uint8_t *data
, int size
, int more
, uint8_t *p
, in_addr_t addr
)
1148 int s
= size
- (p
-data
);
1152 # error "need to update cluster_process_heartbeat()"
1155 // we handle versions 3 through 4
1156 if (more
< 3 || more
> HB_VERSION
) {
1157 LOG(0, 0, 0, "Received a heartbeat version that I don't support (%d)!\n", more
);
1158 return -1; // Ignore it??
1161 // Ok. It's a heartbeat packet from a cluster master!
1169 if (h
->clusterid
!= config
->bind_address
)
1170 return -1; // It's not part of our cluster.
1172 if (config
->cluster_iam_master
) { // Sanity...
1173 // Note that this MUST match the election process above!
1175 LOG(0, 0, 0, "I just got a heartbeat from master %s, but _I_ am the master!\n", fmtaddr(addr
, 0));
1177 LOG(0, 0, 0, "Heartbeat with zero basetime! Ignoring\n");
1178 return -1; // Skip it.
1182 if (h
->table_version
> config
->cluster_table_version
) {
1183 LOG(0, 0, 0, "They've seen more state changes (%" PRIu64
" vs my %" PRIu64
") so I'm gone!\n",
1184 h
->table_version
, config
->cluster_table_version
);
1189 if (h
->table_version
< config
->cluster_table_version
)
1193 if (basetime
> h
->basetime
) {
1194 LOG(0, 0, 0, "They're an older master than me so I'm gone!\n");
1199 if (basetime
< h
->basetime
)
1202 if (my_address
< addr
) { // Tie breaker.
1203 LOG(0, 0, 0, "They're a higher IP address than me, so I'm gone!\n");
1209 // Send it a unicast heartbeat to see give it a chance to die.
1210 // NOTE: It's actually safe to do seq-number - 1 without checking
1213 cluster_catchup_slave(config
->cluster_seq_number
- 1, addr
);
1215 return -1; // Skip it.
1219 // Try and guard against a stray master appearing.
1221 // Ignore heartbeats received from another master before the
1222 // timeout (less a smidgen) for the old master has elapsed.
1224 // Note that after a clean failover, the cluster_master_address
1225 // is cleared, so this doesn't run.
1227 if (config
->cluster_master_address
&& addr
!= config
->cluster_master_address
1228 && (config
->cluster_last_hb
+ config
->cluster_hb_timeout
- 11) > TIME
) {
1229 LOG(0, 0, 0, "Ignoring stray heartbeat from %s, current master %s has not yet timed out (last heartbeat %.1f seconds ago).\n",
1230 fmtaddr(addr
, 0), fmtaddr(config
->cluster_master_address
, 1),
1231 0.1 * (TIME
- config
->cluster_last_hb
));
1232 return -1; // ignore
1235 if (config
->cluster_seq_number
== -1) // Don't have one. Just align to the master...
1236 config
->cluster_seq_number
= h
->seq
;
1238 config
->cluster_last_hb
= TIME
; // Reset to ensure that we don't become master!!
1240 if (config
->cluster_seq_number
!= h
->seq
) { // Out of sequence heartbeat!
1241 static int lastseen_seq
= 0;
1242 static time_t lastseen_time
= 0;
1244 // limit to once per second for a particular seq#
1245 int ask
= (config
->cluster_seq_number
!= lastseen_seq
|| time_now
!= lastseen_time
);
1247 LOG(1, 0, 0, "HB: Got seq# %d but was expecting %d. %s.\n",
1248 h
->seq
, config
->cluster_seq_number
,
1249 ask
? "Asking for resend" : "Ignoring");
1253 lastseen_seq
= config
->cluster_seq_number
;
1254 lastseen_time
= time_now
;
1255 peer_send_message(addr
, C_LASTSEEN
, config
->cluster_seq_number
, NULL
, 0);
1258 config
->cluster_last_hb
= TIME
; // Reset to ensure that we don't become master!!
1260 // Just drop the packet. The master will resend it as part of the catchup.
1264 // Save the packet in our buffer.
1265 // This is needed in case we become the master.
1266 config
->cluster_seq_number
= (h
->seq
+1)%HB_MAX_SEQ
;
1267 i
= h
->seq
% HB_HISTORY_SIZE
;
1268 past_hearts
[i
].seq
= h
->seq
;
1269 past_hearts
[i
].size
= size
;
1270 memcpy(&past_hearts
[i
].data
, data
, size
); // Save it.
1273 // Check that we don't have too many undefined sessions, and
1274 // that the free session pointer is correct.
1275 cluster_check_sessions(h
->highsession
, h
->freesession
, h
->hightunnel
);
1277 if (h
->interval
!= config
->cluster_hb_interval
)
1279 LOG(2, 0, 0, "Master set ping/heartbeat interval to %u (was %u)\n",
1280 h
->interval
, config
->cluster_hb_interval
);
1282 config
->cluster_hb_interval
= h
->interval
;
1285 if (h
->timeout
!= config
->cluster_hb_timeout
)
1287 LOG(2, 0, 0, "Master set heartbeat timeout to %u (was %u)\n",
1288 h
->timeout
, config
->cluster_hb_timeout
);
1290 config
->cluster_hb_timeout
= h
->timeout
;
1293 // Ok. process the packet...
1296 type
= *((uint32_t *) p
);
1297 p
+= sizeof(uint32_t);
1298 s
-= sizeof(uint32_t);
1300 more
= *((uint32_t *) p
);
1301 p
+= sizeof(uint32_t);
1302 s
-= sizeof(uint32_t);
1305 case C_CSESSION
: { // Compressed session structure.
1306 uint8_t c
[ sizeof(sessiont
) + 2];
1308 uint8_t *orig_p
= p
;
1310 size
= rle_decompress((uint8_t **) &p
, s
, c
, sizeof(c
) );
1313 if (size
!= sizeof(sessiont
) ) { // Ouch! Very very bad!
1314 LOG(0, 0, 0, "DANGER: Received a CSESSION that didn't decompress correctly!\n");
1315 // Now what? Should exit! No-longer up to date!
1319 cluster_recv_session(more
, c
);
1323 if ( s
< sizeof(session
[more
]))
1326 cluster_recv_session(more
, p
);
1328 p
+= sizeof(session
[more
]);
1329 s
-= sizeof(session
[more
]);
1332 case C_CTUNNEL
: { // Compressed tunnel structure.
1333 uint8_t c
[ sizeof(tunnelt
) + 2];
1335 uint8_t *orig_p
= p
;
1337 size
= rle_decompress((uint8_t **) &p
, s
, c
, sizeof(c
));
1340 if (size
!= sizeof(tunnelt
) ) { // Ouch! Very very bad!
1341 LOG(0, 0, 0, "DANGER: Received a CSESSION that didn't decompress correctly!\n");
1342 // Now what? Should exit! No-longer up to date!
1346 cluster_recv_tunnel(more
, c
);
1351 if ( s
< sizeof(tunnel
[more
]))
1354 cluster_recv_tunnel(more
, p
);
1356 p
+= sizeof(tunnel
[more
]);
1357 s
-= sizeof(tunnel
[more
]);
1360 LOG(0, 0, 0, "DANGER: I received a heartbeat element where I didn't understand the type! (%d)\n", type
);
1361 return -1; // can't process any more of the packet!!
1365 if (config
->cluster_master_address
!= addr
)
1367 LOG(0, 0, 0, "My master just changed from %s to %s!\n",
1368 fmtaddr(config
->cluster_master_address
, 0), fmtaddr(addr
, 1));
1370 config
->cluster_master_address
= addr
;
1373 config
->cluster_last_hb
= TIME
; // Successfully received a heartbeat!
1374 config
->cluster_table_version
= h
->table_version
;
1378 LOG(0, 0, 0, "I got an incomplete heartbeat packet! This means I'm probably out of sync!!\n");
1383 // We got a packet on the cluster port!
1384 // Handle pings, lastseens, and heartbeats!
1386 int processcluster(char *data
, int size
, in_addr_t addr
)
1392 if (addr
== my_address
)
1393 return -1; // Ignore it. Something looped back the multicast!
1395 LOG(5, 0, 0, "Process cluster: %d bytes from %s\n", size
, fmtaddr(addr
, 0));
1397 if (s
<= 0) // Any data there??
1403 type
= *((uint32_t *) p
);
1404 p
+= sizeof(uint32_t);
1405 s
-= sizeof(uint32_t);
1407 more
= *((uint32_t *) p
);
1408 p
+= sizeof(uint32_t);
1409 s
-= sizeof(uint32_t);
1412 case C_PING
: // Update the peers table.
1413 return cluster_add_peer(addr
, more
, (pingt
*) p
, s
);
1415 case C_MASTER
: // Our master is wrong
1416 return cluster_set_master(addr
, more
);
1418 case C_LASTSEEN
: // Catch up a slave (slave missed a packet).
1419 return cluster_catchup_slave(more
, addr
);
1421 case C_FORWARD
: { // Forwarded control packet. pass off to processudp.
1422 struct sockaddr_in a
;
1423 a
.sin_addr
.s_addr
= more
;
1425 a
.sin_port
= *(int *) p
;
1429 if (!config
->cluster_iam_master
) { // huh?
1430 LOG(0, 0, 0, "I'm not the master, but I got a C_FORWARD from %s?\n", fmtaddr(addr
, 0));
1434 LOG(4, 0, 0, "Got a forwarded packet... (%s:%d)\n", fmtaddr(more
, 0), a
.sin_port
);
1436 processudp(p
, s
, &a
);
1439 case C_THROTTLE
: { // Receive a forwarded packet from a slave.
1440 if (!config
->cluster_iam_master
) {
1441 LOG(0, 0, 0, "I'm not the master, but I got a C_THROTTLE from %s?\n", fmtaddr(addr
, 0));
1445 tbf_queue_packet(more
, p
, s
); // The TBF id tells wether it goes in or out.
1449 // Receive a walled garden packet from a slave.
1450 if (!config
->cluster_iam_master
) {
1451 LOG(0, 0, 0, "I'm not the master, but I got a C_GARDEN from %s?\n", fmtaddr(addr
, 0));
1459 if (!config
->cluster_iam_master
) {
1460 LOG(0, 0, 0, "I'm not the master, but I got a C_BYTES from %s?\n", fmtaddr(addr
, 0));
1464 return cluster_handle_bytes(p
, s
);
1466 case C_KILL
: // The master asked us to die!? (usually because we're too out of date).
1467 if (config
->cluster_iam_master
) {
1468 LOG(0, 0, 0, "_I_ am master, but I received a C_KILL from %s! (Seq# %d)\n", fmtaddr(addr
, 0), more
);
1471 if (more
!= config
->cluster_seq_number
) {
1472 LOG(0, 0, 0, "The master asked us to die but the seq number didn't match!?\n");
1476 if (addr
!= config
->cluster_master_address
) {
1477 LOG(0, 0, 0, "Received a C_KILL from %s which doesn't match config->cluster_master_address (%s)\n",
1478 fmtaddr(addr
, 0), fmtaddr(config
->cluster_master_address
, 1));
1479 // We can only warn about it. The master might really have switched!
1482 LOG(0, 0, 0, "Received a valid C_KILL: I'm going to die now.\n");
1484 exit(0); // Lets be paranoid;
1485 return -1; // Just signalling the compiler.
1488 LOG(4, 0, 0, "Got a heartbeat from %s\n", fmtaddr(addr
, 0));
1489 return cluster_process_heartbeat(data
, size
, more
, p
, addr
);
1492 LOG(0, 0, 0, "Strange type packet received on cluster socket (%d)\n", type
);
1498 LOG(0, 0, 0, "I got a _short_ cluster heartbeat packet! This means I'm probably out of sync!!\n");
1502 //====================================================================================================
1504 int cmd_show_cluster(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
1508 if (CLI_HELP_REQUESTED
)
1509 return CLI_HELP_NO_ARGS
;
1511 cli_print(cli
, "Cluster status : %s", config
->cluster_iam_master
? "Master" : "Slave" );
1512 cli_print(cli
, "My address : %s", fmtaddr(my_address
, 0));
1513 cli_print(cli
, "VIP address : %s", fmtaddr(config
->bind_address
, 0));
1514 cli_print(cli
, "Multicast address: %s", fmtaddr(config
->cluster_address
, 0));
1515 cli_print(cli
, "Multicast i'face : %s", config
->cluster_interface
);
1517 if (!config
->cluster_iam_master
) {
1518 cli_print(cli
, "My master : %s (last heartbeat %.1f seconds old)",
1519 config
->cluster_master_address
1520 ? fmtaddr(config
->cluster_master_address
, 0)
1522 0.1 * (TIME
- config
->cluster_last_hb
));
1523 cli_print(cli
, "Uptodate : %s", config
->cluster_iam_uptodate
? "Yes" : "No");
1524 cli_print(cli
, "Table version # : %" PRIu64
, config
->cluster_table_version
);
1525 cli_print(cli
, "Next sequence number expected: %d", config
->cluster_seq_number
);
1526 cli_print(cli
, "%d sessions undefined of %d", config
->cluster_undefined_sessions
, config
->cluster_highest_sessionid
);
1527 cli_print(cli
, "%d tunnels undefined of %d", config
->cluster_undefined_tunnels
, config
->cluster_highest_tunnelid
);
1529 cli_print(cli
, "Table version # : %" PRIu64
, config
->cluster_table_version
);
1530 cli_print(cli
, "Next heartbeat # : %d", config
->cluster_seq_number
);
1531 cli_print(cli
, "Highest session : %d", config
->cluster_highest_sessionid
);
1532 cli_print(cli
, "Highest tunnel : %d", config
->cluster_highest_tunnelid
);
1533 cli_print(cli
, "%d changes queued for sending", config
->cluster_num_changes
);
1535 cli_print(cli
, "%d peers.", num_peers
);
1538 cli_print(cli
, "%20s %10s %8s", "Address", "Basetime", "Age");
1539 for (i
= 0; i
< num_peers
; ++i
) {
1540 cli_print(cli
, "%20s %10u %8d", fmtaddr(peers
[i
].peer
, 0),
1541 peers
[i
].basetime
, TIME
- peers
[i
].timestamp
);
1547 // Simple run-length-encoding compression.
1549 // 1 byte < 128 = count of non-zero bytes following. // Not legal to be zero.
1550 // n non-zero bytes;
1552 // 1 byte > 128 = (count - 128) run of zero bytes. //
1554 // count == 0 indicates end of compressed stream.
1556 // Compress from 'src' into 'dst'. return number of bytes
1558 // Updates *src_p to indicate 1 past last bytes used.
1560 // We could get an extra byte in the zero runs by storing (count-1)
1561 // but I'm playing it safe.
1563 // Worst case is a 50% expansion in space required (trying to
1564 // compress { 0x00, 0x01 } * N )
1565 static int rle_compress(uint8_t **src_p
, int ssize
, uint8_t *dst
, int dsize
)
1568 int orig_dsize
= dsize
;
1572 while (ssize
> 0 && dsize
> 2) {
1574 x
= dst
++; --dsize
; // Reserve space for count byte..
1576 if (*src
) { // Copy a run of non-zero bytes.
1577 while (*src
&& count
< 127 && ssize
> 0 && dsize
> 1) { // Count number of non-zero bytes.
1582 *x
= count
; // Store number of non-zero bytes. Guarenteed to be non-zero!
1584 } else { // Compress a run of zero bytes.
1585 while (*src
== 0 && count
< 127 && ssize
> 0) {
1594 *dst
++ = 0x0; // Add Stop byte.
1598 return (orig_dsize
- dsize
);
1602 // Decompress the buffer into **p.
1603 // 'psize' is the size of the decompression buffer available.
1605 // Returns the number of bytes decompressed.
1607 // Decompresses from '*src_p' into 'dst'.
1608 // Return the number of dst bytes used.
1609 // Updates the 'src_p' pointer to point to the
1610 // first un-used byte.
1611 static int rle_decompress(uint8_t **src_p
, int ssize
, uint8_t *dst
, int dsize
)
1614 int orig_dsize
= dsize
;
1617 while (ssize
>0 && dsize
> 0) { // While there's more to decompress, and there's room in the decompress buffer...
1618 count
= *src
++; --ssize
; // get the count byte from the source.
1619 if (count
== 0x0) // End marker reached? If so, finish.
1622 if (count
& 0x80) { // Decompress a run of zeros
1623 for (count
&= 0x7f ; count
> 0 && dsize
> 0; --count
) {
1627 } else { // Copy run of non-zero bytes.
1628 for ( ; count
> 0 && ssize
&& dsize
; --count
) { // Copy non-zero bytes across.
1635 return (orig_dsize
- dsize
);