merge cluster fixes from release_2_0 branch
This commit is contained in:
bodea
parent
75ca5fa449
commit
ca4801db55
8 changed files with 143 additions and 32 deletions
18
Changes
18
Changes
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@ -1,4 +1,4 @@
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* Mon May 16 2005 Brendan O'Dea <bod@optusnet.com.au> 2.1.0
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* Thu May 26 2005 Brendan O'Dea <bod@optusnet.com.au> 2.1.0
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- Add IPv6 support from Jonathan McDowell.
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- Add CHAP support from Jordan Hrycaj.
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- Add interim accounting support from Vladislav Bjelic.
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@ -61,6 +61,22 @@
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- Add sessionctl plugin to provide drop/kill via nsctl.
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- Add handling of "throttle=N" RADIUS attributes.
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- Fix RADIUS indexing (should have 16K entries with 64 sockets).
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- Cluster changes from Michael, intended to prevent a stray master
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from trashing a cluster:
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+ Ignore heartbeats from peers claiming to be the master before the
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timeout on the old master has expired.
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+ A master receiving a stray heartbeat sends a unicast HB back, which
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should cause the rogue to die due to the tie-breaker code.
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+ Keep probing the master for late heartbeats.
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+ Drop BGP as soon as we become master with the minumum required peers.
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+ Any PING seen from a master forces an election (rather than just
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where basetime is zero).
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+ A slave which receives a LASTSEEN message (presumably a restarted
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master) sends back new message type, C_MASTER which indicates the
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address of the current master.
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- New config option: cluster_master_min_adv which determines the minimum
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number of up to date slaves required before the master will drop
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routes.
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* Fri Dec 17 2004 Brendan O'Dea <bod@optusnet.com.au> 2.0.13
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- Better cluster master collision resolution: keep a counter of state
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@ -324,6 +324,11 @@ Cluster heartbeat timeout in tenths of a second. A new master will be
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elected when this interval has been passed without seeing a heartbeat
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from the master.
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</LI>
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<LI><B>cluster_master_min_adv</B> (int)<BR>
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Determines the minumum number of up to date slaves required before the
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master will drop routes (default: 1).
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</LI>
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</UL>
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<P>BGP routing configuration is entered by the command:
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@ -2,7 +2,7 @@
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.de Id
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.ds Dt \\$4 \\$5
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..
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.Id $Id: startup-config.5,v 1.7 2005/05/10 11:59:25 bodea Exp $
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.Id $Id: startup-config.5,v 1.8 2005/05/26 12:17:31 bodea Exp $
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.TH STARTUP-CONFIG 5 "\*(Dt" L2TPNS "File Formats and Conventions"
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.SH NAME
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startup\-config \- configuration file for l2tpns
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@ -189,6 +189,10 @@ Cluster heartbeat timeout in tenths of a second. A new master will be
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elected when this interval has been passed without seeing a heartbeat
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from the master.
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.TP
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.B cluster_master_min_adv
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Determines the minumum number of up to date slaves required before the
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master will drop routes (default: 1).
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.TP
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.B ipv6_prefix
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Enable negotiation of IPv6. This forms the the first 64 bits of the
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client allocated address. The remaining 64 come from the allocated
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120
cluster.c
120
cluster.c
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@ -1,6 +1,6 @@
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// L2TPNS Clustering Stuff
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char const *cvs_id_cluster = "$Id: cluster.c,v 1.38 2005/05/24 07:45:13 bodea Exp $";
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char const *cvs_id_cluster = "$Id: cluster.c,v 1.39 2005/05/26 12:17:30 bodea Exp $";
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#include <stdio.h>
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#include <stdlib.h>
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@ -193,7 +193,7 @@ static void add_type(char **p, int type, int more, char *data, int size)
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}
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// advertise our presence via BGP or gratuitous ARP
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static void advertise(void)
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static void advertise_routes(void)
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{
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#ifdef BGP
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if (bgp_configured)
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@ -204,6 +204,15 @@ static void advertise(void)
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send_garp(config->bind_address); // Start taking traffic.
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}
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// withdraw our routes (BGP only)
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static void withdraw_routes(void)
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{
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#ifdef BGP
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if (bgp_configured)
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bgp_enable_routing(0);
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#endif /* BGP */
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}
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static void cluster_uptodate(void)
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{
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if (config->cluster_iam_uptodate)
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@ -215,7 +224,7 @@ static void cluster_uptodate(void)
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config->cluster_iam_uptodate = 1;
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LOG(0, 0, 0, "Now uptodate with master.\n");
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advertise();
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advertise_routes();
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}
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//
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@ -457,17 +466,22 @@ void cluster_check_slaves(void)
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continue; // Shutdown peer! Skip them.
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if (peers[i].uptodate)
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have_peers = 1;
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if (!peers[i].uptodate)
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have_peers++;
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else
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config->cluster_iam_uptodate = 0; // Start fast heartbeats
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}
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#ifdef BGP
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// in a cluster, withdraw/add routes when we get a peer/lose all peers
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if (bgp_configured && have_peers != had_peers)
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bgp_enable_routing(!have_peers);
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#endif /* BGP */
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// in a cluster, withdraw/add routes when we get a peer/lose peers
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if (have_peers != had_peers)
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{
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if (had_peers < config->cluster_master_min_adv &&
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have_peers >= config->cluster_master_min_adv)
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withdraw_routes();
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else if (had_peers >= config->cluster_master_min_adv &&
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have_peers < config->cluster_master_min_adv)
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advertise_routes();
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}
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}
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//
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@ -480,20 +494,22 @@ void cluster_check_master(void)
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int last_free = 0;
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clockt t = TIME;
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static int probed = 0;
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int have_peers;
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if (config->cluster_iam_master)
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return; // Only runs on the slaves...
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// If the master is late (missed 2 hearbeats by a second and a
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// hair) it may be that the switch has dropped us from the
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// multicast group, try unicasting one probe to the master
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// multicast group, try unicasting probes to the master
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// which will hopefully respond with a unicast heartbeat that
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// will allow us to limp along until the querier next runs.
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if (TIME > (config->cluster_last_hb + 2 * config->cluster_hb_interval + 11))
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if (config->cluster_master_address
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&& TIME > (config->cluster_last_hb + 2 * config->cluster_hb_interval + 11))
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{
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if (!probed && config->cluster_master_address)
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if (!probed || (TIME > (probed + 2 * config->cluster_hb_interval)))
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{
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probed = 1;
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probed = TIME;
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LOG(1, 0, 0, "Heartbeat from master %.1fs late, probing...\n",
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0.1 * (TIME - (config->cluster_last_hb + config->cluster_hb_interval)));
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@ -511,7 +527,7 @@ void cluster_check_master(void)
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LOG(0, 0, 0, "Master timed out! Holding election...\n");
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for (i = 0; i < num_peers; i++)
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for (i = have_peers = 0; i < num_peers; i++)
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{
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if ((peers[i].timestamp + config->cluster_hb_timeout) < t)
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continue; // Stale peer! Skip them.
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@ -529,6 +545,9 @@ void cluster_check_master(void)
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LOG(1, 0, 0, "Expecting %s to become master\n", fmtaddr(peers[i].peer, 0));
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return; // They'll win the election. Wait for them to come up.
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}
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if (peers[i].uptodate)
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have_peers++;
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}
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// Wow. it's been ages since I last heard a heartbeat
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@ -540,6 +559,11 @@ void cluster_check_master(void)
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LOG(0, 0, 0, "I am declaring myself the master!\n");
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if (have_peers < config->cluster_master_min_adv)
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advertise_routes();
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else
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withdraw_routes();
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if (config->cluster_seq_number == -1)
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config->cluster_seq_number = 0;
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@ -620,9 +644,6 @@ void cluster_check_master(void)
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config->cluster_undefined_tunnels = 0;
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config->cluster_iam_uptodate = 1; // assume all peers are up-to-date
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if (!num_peers) // lone master
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advertise();
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// FIXME. We need to fix up the tunnel control message
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// queue here! There's a number of other variables we
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// should also update.
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@ -902,6 +923,13 @@ static int cluster_catchup_slave(int seq, in_addr_t slave)
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int diff;
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LOG(1, 0, 0, "Slave %s sent LASTSEEN with seq %d\n", fmtaddr(slave, 0), seq);
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if (!config->cluster_iam_master) {
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LOG(1, 0, 0, "Got LASTSEEN but I'm not a master! Redirecting it to %s.\n",
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fmtaddr(config->cluster_master_address, 0));
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peer_send_message(slave, C_MASTER, config->cluster_master_address, NULL, 0);
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return 0;
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}
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diff = config->cluster_seq_number - seq; // How many packet do we need to send?
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if (diff < 0)
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@ -913,6 +941,8 @@ static int cluster_catchup_slave(int seq, in_addr_t slave)
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return peer_send_message(slave, C_KILL, seq, NULL, 0);// Kill the slave. Nothing else to do.
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}
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LOG(1, 0, 0, "Sending %d catchup packets to slave %s\n", diff, fmtaddr(slave, 0) );
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// Now resend every packet that it missed, in order.
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while (seq != config->cluster_seq_number) {
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s = seq % HB_HISTORY_SIZE;
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@ -968,8 +998,10 @@ static int cluster_add_peer(in_addr_t peer, time_t basetime, pingt *pp, int size
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}
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// Is this the master shutting down??
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if (peer == config->cluster_master_address && !basetime) {
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LOG(3, 0, 0, "Master %s shutting down...\n", fmtaddr(config->cluster_master_address, 0));
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if (peer == config->cluster_master_address) {
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LOG(3, 0, 0, "Master %s %s\n", fmtaddr(config->cluster_master_address, 0),
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basetime ? "has restarted!" : "shutting down...");
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config->cluster_master_address = 0;
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config->cluster_last_hb = 0; // Force an election.
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cluster_check_master();
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@ -1010,6 +1042,20 @@ static int cluster_add_peer(in_addr_t peer, time_t basetime, pingt *pp, int size
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return 1;
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}
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// A slave responds with C_MASTER when it gets a message which should have gone to a master.
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static int cluster_set_master(in_addr_t peer, in_addr_t master)
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{
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if (config->cluster_iam_master) // Sanity...
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return 0;
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LOG(3, 0, 0, "Peer %s set the master to %s...\n", fmtaddr(peer, 0),
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fmtaddr(master, 1));
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config->cluster_master_address = master;
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cluster_check_master();
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return 0;
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}
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/* Handle the slave updating the byte counters for the master. */
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//
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// Note that we don't mark the session as dirty; We rely on
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@ -1283,9 +1329,33 @@ static int cluster_process_heartbeat(uint8_t *data, int size, int more, uint8_t
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exit(1);
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}
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//
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// Send it a unicast heartbeat to see give it a chance to die.
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// NOTE: It's actually safe to do seq-number - 1 without checking
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// for wrap around.
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//
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cluster_catchup_slave(config->cluster_seq_number - 1, addr);
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return -1; // Skip it.
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}
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//
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// Try and guard against a stray master appearing.
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//
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// Ignore heartbeats received from another master before the
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// timeout (less a smidgen) for the old master has elapsed.
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//
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// Note that after a clean failover, the cluster_master_address
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// is cleared, so this doesn't run.
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//
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if (config->cluster_master_address && addr != config->cluster_master_address
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&& (config->cluster_last_hb + config->cluster_hb_timeout - 11) > TIME) {
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LOG(0, 0, 0, "Ignoring stray heartbeat from %s, current master %s has not yet timed out (last heartbeat %.1f seconds ago).\n",
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fmtaddr(addr, 0), fmtaddr(config->cluster_master_address, 1),
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0.1 * (TIME - config->cluster_last_hb));
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return -1; // ignore
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}
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if (config->cluster_seq_number == -1) // Don't have one. Just align to the master...
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config->cluster_seq_number = h->seq;
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@ -1490,6 +1560,9 @@ int processcluster(char *data, int size, in_addr_t addr)
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case C_PING: // Update the peers table.
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return cluster_add_peer(addr, more, (pingt *) p, s);
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case C_MASTER: // Our master is wrong
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return cluster_set_master(addr, more);
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case C_LASTSEEN: // Catch up a slave (slave missed a packet).
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return cluster_catchup_slave(more, addr);
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@ -1531,6 +1604,11 @@ int processcluster(char *data, int size, in_addr_t addr)
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return 0;
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case C_BYTES:
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if (!config->cluster_iam_master) {
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LOG(0, 0, 0, "I'm not the master, but I got a C_BYTES from %s?\n", fmtaddr(addr, 0));
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return -1;
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}
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return cluster_handle_bytes(p, s);
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case C_KILL: // The master asked us to die!? (usually because we're too out of date).
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@ -1,5 +1,5 @@
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// L2TPNS Clustering Stuff
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// $Id: cluster.h,v 1.10 2005/05/08 08:00:50 bodea Exp $
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// $Id: cluster.h,v 1.11 2005/05/26 12:17:30 bodea Exp $
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#ifndef __CLUSTER_H__
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#define __CLUSTER_H__
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@ -19,6 +19,7 @@
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#define C_CSESSION 12 // Compressed session structure.
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#define C_CTUNNEL 13 // Compressed tunnel structure.
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#define C_GARDEN 14 // Gardened packet
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#define C_MASTER 15 // Tell a slave the address of the master.
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#define HB_VERSION 5 // Protocol version number..
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#define HB_MAX_SEQ (1<<30) // Maximum sequence number. (MUST BE A POWER OF 2!)
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4
l2tpns.c
4
l2tpns.c
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@ -4,7 +4,7 @@
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// Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
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// vim: sw=8 ts=8
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char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.104 2005/05/16 04:51:16 bodea Exp $";
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char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.105 2005/05/26 12:17:30 bodea Exp $";
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#include <arpa/inet.h>
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#include <assert.h>
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@ -131,6 +131,7 @@ config_descriptt config_values[] = {
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CONFIG("cluster_interface", cluster_interface, STRING),
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CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
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CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
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CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
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CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
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{ NULL, 0, 0, 0 },
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};
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@ -3199,6 +3200,7 @@ static void initdata(int optdebug, char *optconfig)
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config->debug = optdebug;
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config->num_tbfs = MAXTBFS;
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config->rl_rate = 28; // 28kbps
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config->cluster_master_min_adv = 1;
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strcpy(config->random_device, RANDOMDEVICE);
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log_stream = stderr;
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9
l2tpns.h
9
l2tpns.h
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@ -1,5 +1,5 @@
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// L2TPNS Global Stuff
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// $Id: l2tpns.h,v 1.72 2005/05/20 01:32:14 bodea Exp $
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// $Id: l2tpns.h,v 1.73 2005/05/26 12:17:30 bodea Exp $
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#ifndef __L2TPNS_H__
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#define __L2TPNS_H__
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@ -474,7 +474,8 @@ typedef struct
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char old_plugins[64][MAXPLUGINS];
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int next_tbf; // Next HTB id available to use
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int scheduler_fifo; // If the system has multiple CPUs, use FIFO scheduling policy for this process.
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int scheduler_fifo; // If the system has multiple CPUs, use FIFO scheduling
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// policy for this process.
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int lock_pages; // Lock pages into memory.
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int icmp_rate; // Max number of ICMP unreachable per second to send
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int max_packets; // DoS prevention: per session limit of packets/0.1s
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@ -501,6 +502,10 @@ typedef struct
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struct in6_addr ipv6_prefix; // Our IPv6 network pool.
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int cluster_master_min_adv; // Master advertises routes while the number of up to date
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// slaves is less than this value.
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#ifdef BGP
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#define BGP_NUM_PEERS 2
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uint16_t as_number;
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@ -43,5 +43,5 @@ rm -rf %{buildroot}
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%attr(644,root,root) /usr/share/man/man[58]/*
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%changelog
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* Mon May 16 2005 Brendan O'Dea <bod@optusnet.com.au> 2.1.0-1
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* Thu May 26 2005 Brendan O'Dea <bod@optusnet.com.au> 2.1.0-1
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- 2.1.0 release, see /usr/share/doc/l2tpns-2.1.0/Changes
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