src/PVE/Network.pm

   1 package PVE::Network;
   2
   3 use strict;
   4 use warnings;
   5 use PVE::Tools qw(run_command lock_file);
   6 use PVE::ProcFSTools;
   7 use PVE::INotify;
   8 use File::Basename;
   9 use IO::Socket::IP;
  10 use Socket qw(NI_NUMERICHOST NI_NUMERICSERV);
  11 use POSIX qw(ECONNREFUSED);
  12
  13 use Net::IP;
  14
  15 # host network related utility functions
  16
  17 our $ipv4_reverse_mask = [
  18     '0.0.0.0',
  19     '128.0.0.0',
  20     '192.0.0.0',
  21     '224.0.0.0',
  22     '240.0.0.0',
  23     '248.0.0.0',
  24     '252.0.0.0',
  25     '254.0.0.0',
  26     '255.0.0.0',
  27     '255.128.0.0',
  28     '255.192.0.0',
  29     '255.224.0.0',
  30     '255.240.0.0',
  31     '255.248.0.0',
  32     '255.252.0.0',
  33     '255.254.0.0',
  34     '255.255.0.0',
  35     '255.255.128.0',
  36     '255.255.192.0',
  37     '255.255.224.0',
  38     '255.255.240.0',
  39     '255.255.248.0',
  40     '255.255.252.0',
  41     '255.255.254.0',
  42     '255.255.255.0',
  43     '255.255.255.128',
  44     '255.255.255.192',
  45     '255.255.255.224',
  46     '255.255.255.240',
  47     '255.255.255.248',
  48     '255.255.255.252',
  49     '255.255.255.254',
  50     '255.255.255.255',
  51 ];
  52
  53 our $ipv4_mask_hash_localnet = {
  54     '255.0.0.0' => 8,
  55     '255.128.0.0' => 9,
  56     '255.192.0.0' => 10,
  57     '255.224.0.0' => 11,
  58     '255.240.0.0' => 12,
  59     '255.248.0.0' => 13,
  60     '255.252.0.0' => 14,
  61     '255.254.0.0' => 15,
  62     '255.255.0.0' => 16,
  63     '255.255.128.0' => 17,
  64     '255.255.192.0' => 18,
  65     '255.255.224.0' => 19,
  66     '255.255.240.0' => 20,
  67     '255.255.248.0' => 21,
  68     '255.255.252.0' => 22,
  69     '255.255.254.0' => 23,
  70     '255.255.255.0' => 24,
  71     '255.255.255.128' => 25,
  72     '255.255.255.192' => 26,
  73     '255.255.255.224' => 27,
  74     '255.255.255.240' => 28,
  75     '255.255.255.248' => 29,
  76     '255.255.255.252' => 30,
  77     '255.255.255.254' => 31,
  78     '255.255.255.255' => 32,
  79 };
  80
  81 sub setup_tc_rate_limit {
  82     my ($iface, $rate, $burst, $debug) = @_;
  83
  84     # these are allowed / expected to fail, e.g. when there is no previous rate limit to remove
  85     eval { run_command("/sbin/tc class del dev $iface parent 1: classid 1:1 >/dev/null 2>&1"); };
  86     eval { run_command("/sbin/tc filter del dev $iface parent ffff: protocol all pref 50 u32 >/dev/null 2>&1"); };
  87     eval { run_command("/sbin/tc qdisc del dev $iface ingress >/dev/null 2>&1"); };
  88     eval { run_command("/sbin/tc qdisc del dev $iface root >/dev/null 2>&1"); };
  89
  90     return if !$rate;
  91
  92     # tbf does not work for unknown reason
  93     #$TC qdisc add dev $DEV root tbf rate $RATE latency 100ms burst $BURST
  94     # so we use htb instead
  95     run_command("/sbin/tc qdisc add dev $iface root handle 1: htb default 1");
  96     run_command("/sbin/tc class add dev $iface parent 1: classid 1:1 " .
  97                 "htb rate ${rate}bps burst ${burst}b");
  98
  99     run_command("/sbin/tc qdisc add dev $iface handle ffff: ingress");
 100     run_command("/sbin/tc filter add dev $iface parent ffff: " .
 101                 "prio 50 basic " .
 102                 "police rate ${rate}bps burst ${burst}b mtu 64kb " .
 103                 "drop flowid :1");
 104
 105     if ($debug) {
 106         print "DEBUG tc settings\n";
 107         system("/sbin/tc qdisc ls dev $iface");
 108         system("/sbin/tc class ls dev $iface");
 109         system("/sbin/tc filter ls dev $iface parent ffff:");
 110     }
 111 }
 112
 113 sub tap_rate_limit {
 114     my ($iface, $rate) = @_;
 115
 116     my $debug = 0;
 117     $rate = int($rate*1024*1024) if $rate;
 118     my $burst = 1024*1024;
 119
 120     setup_tc_rate_limit($iface, $rate, $burst, $debug);
 121 }
 122
 123 my $read_bridge_mtu = sub {
 124     my ($bridge) = @_;
 125
 126     my $mtu = PVE::Tools::file_read_firstline("/sys/class/net/$bridge/mtu");
 127     die "bridge '$bridge' does not exist\n" if !$mtu;
 128     # avoid insecure dependency;
 129     die "unable to parse mtu value" if $mtu !~ /^(\d+)$/;
 130     $mtu = int($1);
 131
 132     return $mtu;
 133 };
 134
 135 my $parse_tap_device_name = sub {
 136     my ($iface, $noerr) = @_;
 137
 138     my ($vmid, $devid);
 139
 140     if ($iface =~ m/^tap(\d+)i(\d+)$/) {
 141         $vmid = $1;
 142         $devid = $2;
 143     } elsif ($iface =~ m/^veth(\d+)i(\d+)$/) {
 144         $vmid = $1;
 145         $devid = $2;
 146     } else {
 147         return undef if $noerr;
 148         die "can't create firewall bridge for random interface name '$iface'\n";
 149     }
 150
 151     return ($vmid, $devid);
 152 };
 153
 154 my $compute_fwbr_names = sub {
 155     my ($vmid, $devid) = @_;
 156
 157     my $fwbr = "fwbr${vmid}i${devid}";
 158     # Note: the firewall use 'fwln+' to filter traffic to VMs
 159     my $vethfw = "fwln${vmid}i${devid}";
 160     my $vethfwpeer = "fwpr${vmid}p${devid}";
 161     my $ovsintport = "fwln${vmid}o${devid}";
 162
 163     return ($fwbr, $vethfw, $vethfwpeer, $ovsintport);
 164 };
 165
 166 my $cond_create_bridge = sub {
 167     my ($bridge) = @_;
 168
 169     if (! -d "/sys/class/net/$bridge") {
 170         system("/sbin/brctl addbr $bridge") == 0 ||
 171             die "can't add bridge '$bridge'\n";
 172         disable_ipv6($bridge);
 173     }
 174 };
 175
 176 sub disable_ipv6 {
 177     my ($iface) = @_;
 178     return if !-d '/proc/sys/net/ipv6'; # ipv6 might be completely disabled
 179     my $file = "/proc/sys/net/ipv6/conf/$iface/disable_ipv6";
 180     open(my $fh, '>', $file) or die "failed to open $file for writing: $!\n";
 181     print {$fh} "1\n" or die "failed to disable link-local ipv6 for $iface\n";
 182     close($fh);
 183 }
 184
 185 my $bridge_add_interface = sub {
 186     my ($bridge, $iface, $tag, $trunks) = @_;
 187
 188     # drop link local address (it can't be used when on a bridge anyway)
 189     disable_ipv6($iface);
 190     system("/sbin/brctl addif $bridge $iface") == 0 ||
 191         die "can't add interface 'iface' to bridge '$bridge'\n";
 192
 193    my $vlan_aware = PVE::Tools::file_read_firstline("/sys/class/net/$bridge/bridge/vlan_filtering");
 194
 195    if ($vlan_aware) {
 196         if ($tag) {
 197             system({'/sbin/bridge'} 'bridge', 'vlan', 'del', 'dev', $iface, 'vid', '1-4094') == 0
 198                 or die "failed to remove default vlan tags of $iface\n";
 199             system({'/sbin/bridge'} 'bridge', 'vlan', 'add', 'dev', $iface, 'vid', $tag, 'pvid', 'untagged') == 0
 200                 or die "unable to add vlan $tag to interface $iface\n";
 201
 202             warn "Caution: Setting VLAN ID 1 on a VLAN aware bridge may be dangerous\n" if $tag == 1;
 203         } else {
 204             system("/sbin/bridge vlan add dev $iface vid 2-4094") == 0 ||
 205             die "unable to add default vlan tags to interface $iface\n" if !$trunks;
 206         }
 207
 208         if ($trunks) {
 209             my @trunks_array = split /;/, $trunks;
 210             foreach my $trunk (@trunks_array) {
 211                 system("/sbin/bridge vlan add dev $iface vid $trunk") == 0 ||
 212                 die "unable to add vlan $trunk to interface $iface\n";
 213             }
 214         }
 215    }
 216 };
 217
 218 my $ovs_bridge_add_port = sub {
 219     my ($bridge, $iface, $tag, $internal, $trunks) = @_;
 220
 221     $trunks =~ s/;/,/g if $trunks;
 222
 223     my $cmd = "/usr/bin/ovs-vsctl add-port $bridge $iface";
 224     $cmd .= " tag=$tag" if $tag;
 225     $cmd .= " trunks=". join(',', $trunks) if $trunks;
 226     $cmd .= " vlan_mode=native-untagged" if $tag && $trunks;
 227
 228     $cmd .= " -- set Interface $iface type=internal" if $internal;
 229     system($cmd) == 0 ||
 230         die "can't add ovs port '$iface'\n";
 231     disable_ipv6($iface);
 232 };
 233
 234 my $activate_interface = sub {
 235     my ($iface) = @_;
 236
 237     system("/sbin/ip link set $iface up") == 0 ||
 238         die "can't activate interface '$iface'\n";
 239 };
 240
 241 sub tap_create {
 242     my ($iface, $bridge) = @_;
 243
 244     die "unable to get bridge setting\n" if !$bridge;
 245
 246     my $bridgemtu = &$read_bridge_mtu($bridge);
 247
 248     eval {
 249         disable_ipv6($iface);
 250         PVE::Tools::run_command(['/sbin/ip', 'link', 'set', $iface, 'up', 'promisc', 'on', 'mtu', $bridgemtu]);
 251     };
 252     die "interface activation failed\n" if $@;
 253 }
 254
 255 sub veth_create {
 256     my ($veth, $vethpeer, $bridge, $mac) = @_;
 257
 258     die "unable to get bridge setting\n" if !$bridge;
 259
 260     my $bridgemtu = &$read_bridge_mtu($bridge);
 261
 262     # create veth pair
 263     if (! -d "/sys/class/net/$veth") {
 264         my $cmd = "/sbin/ip link add name $veth type veth peer name $vethpeer mtu $bridgemtu";
 265         $cmd .= " addr $mac" if $mac;
 266         system($cmd) == 0 || die "can't create interface $veth\n";
 267     }
 268
 269     # up vethpair
 270     disable_ipv6($veth);
 271     disable_ipv6($vethpeer);
 272     &$activate_interface($veth);
 273     &$activate_interface($vethpeer);
 274 }
 275
 276 sub veth_delete {
 277     my ($veth) = @_;
 278
 279     if (-d "/sys/class/net/$veth") {
 280         run_command("/sbin/ip link delete dev $veth", outfunc => sub {}, errfunc => sub {});
 281     }
 282     eval { tap_unplug($veth) };
 283 }
 284
 285 my $create_firewall_bridge_linux = sub {
 286     my ($iface, $bridge, $tag, $trunks) = @_;
 287
 288     my ($vmid, $devid) = &$parse_tap_device_name($iface);
 289     my ($fwbr, $vethfw, $vethfwpeer) = &$compute_fwbr_names($vmid, $devid);
 290
 291     &$cond_create_bridge($fwbr);
 292     &$activate_interface($fwbr);
 293
 294     copy_bridge_config($bridge, $fwbr);
 295     veth_create($vethfw, $vethfwpeer, $bridge);
 296
 297     &$bridge_add_interface($fwbr, $vethfw);
 298     &$bridge_add_interface($bridge, $vethfwpeer, $tag, $trunks);
 299
 300     &$bridge_add_interface($fwbr, $iface);
 301 };
 302
 303 my $create_firewall_bridge_ovs = sub {
 304     my ($iface, $bridge, $tag, $trunks) = @_;
 305
 306     my ($vmid, $devid) = &$parse_tap_device_name($iface);
 307     my ($fwbr, undef, undef, $ovsintport) = &$compute_fwbr_names($vmid, $devid);
 308
 309     my $bridgemtu = &$read_bridge_mtu($bridge);
 310
 311     &$cond_create_bridge($fwbr);
 312     &$activate_interface($fwbr);
 313
 314     &$bridge_add_interface($fwbr, $iface);
 315
 316     &$ovs_bridge_add_port($bridge, $ovsintport, $tag, 1, $trunks);
 317     &$activate_interface($ovsintport);
 318
 319     # set the same mtu for ovs int port
 320     PVE::Tools::run_command(['/sbin/ip', 'link', 'set', $ovsintport, 'mtu', $bridgemtu]);
 321
 322     &$bridge_add_interface($fwbr, $ovsintport);
 323 };
 324
 325 my $cleanup_firewall_bridge = sub {
 326     my ($iface) = @_;
 327
 328     my ($vmid, $devid) = &$parse_tap_device_name($iface, 1);
 329     return if !defined($vmid);
 330     my ($fwbr, $vethfw, $vethfwpeer, $ovsintport) = &$compute_fwbr_names($vmid, $devid);
 331
 332     # cleanup old port config from any openvswitch bridge
 333     if (-d "/sys/class/net/$ovsintport") {
 334         run_command("/usr/bin/ovs-vsctl del-port $ovsintport", outfunc => sub {}, errfunc => sub {});
 335     }
 336
 337     # delete old vethfw interface
 338     veth_delete($vethfw);
 339
 340     # cleanup fwbr bridge
 341     if (-d "/sys/class/net/$fwbr") {
 342         run_command("/sbin/ip link set dev $fwbr down", outfunc => sub {}, errfunc => sub {});
 343         run_command("/sbin/brctl delbr $fwbr", outfunc => sub {}, errfunc => sub {});
 344     }
 345 };
 346
 347 sub tap_plug {
 348     my ($iface, $bridge, $tag, $firewall, $trunks, $rate) = @_;
 349
 350     #cleanup old port config from any openvswitch bridge
 351     eval {run_command("/usr/bin/ovs-vsctl del-port $iface", outfunc => sub {}, errfunc => sub {}) };
 352
 353     if (-d "/sys/class/net/$bridge/bridge") {
 354         &$cleanup_firewall_bridge($iface); # remove stale devices
 355
 356         my $vlan_aware = PVE::Tools::file_read_firstline("/sys/class/net/$bridge/bridge/vlan_filtering");
 357
 358         if (!$vlan_aware) {
 359             die "vlan aware feature need to be enabled to use trunks" if $trunks;
 360             my $newbridge = activate_bridge_vlan($bridge, $tag);
 361             copy_bridge_config($bridge, $newbridge) if $bridge ne $newbridge;
 362             $bridge = $newbridge;
 363             $tag = undef;
 364         }
 365
 366         if ($firewall) {
 367             &$create_firewall_bridge_linux($iface, $bridge, $tag, $trunks);
 368         } else {
 369             &$bridge_add_interface($bridge, $iface, $tag, $trunks);
 370         }
 371
 372     } else {
 373         &$cleanup_firewall_bridge($iface); # remove stale devices
 374
 375         if ($firewall) {
 376             &$create_firewall_bridge_ovs($iface, $bridge, $tag, $trunks);
 377         } else {
 378             &$ovs_bridge_add_port($bridge, $iface, $tag, undef, $trunks);
 379         }
 380     }
 381
 382     tap_rate_limit($iface, $rate);
 383 }
 384
 385 sub tap_unplug {
 386     my ($iface) = @_;
 387
 388     my $path= "/sys/class/net/$iface/brport/bridge";
 389     if (-l $path) {
 390         my $bridge = basename(readlink($path));
 391         #avoid insecure dependency;
 392         ($bridge) = $bridge =~ /(\S+)/;
 393
 394         system("/sbin/brctl delif $bridge $iface") == 0 ||
 395             die "can't del interface '$iface' from bridge '$bridge'\n";
 396
 397     }
 398
 399     &$cleanup_firewall_bridge($iface);
 400     #cleanup old port config from any openvswitch bridge
 401     eval {run_command("/usr/bin/ovs-vsctl del-port $iface", outfunc => sub {}, errfunc => sub {}) };
 402 }
 403
 404 sub copy_bridge_config {
 405     my ($br0, $br1) = @_;
 406
 407     return if $br0 eq $br1;
 408
 409     my $br_configs = [ 'ageing_time', 'stp_state', 'priority', 'forward_delay',
 410                        'hello_time', 'max_age', 'multicast_snooping', 'multicast_querier'];
 411
 412     foreach my $sysname (@$br_configs) {
 413         eval {
 414             my $v0 = PVE::Tools::file_read_firstline("/sys/class/net/$br0/bridge/$sysname");
 415             my $v1 = PVE::Tools::file_read_firstline("/sys/class/net/$br1/bridge/$sysname");
 416             if ($v0 ne $v1) {
 417                  PVE::ProcFSTools::write_proc_entry("/sys/class/net/$br1/bridge/$sysname", $v0);
 418             }
 419         };
 420         warn $@ if $@;
 421     }
 422 }
 423
 424 sub activate_bridge_vlan_slave {
 425     my ($bridgevlan, $iface, $tag) = @_;
 426     my $ifacevlan = "${iface}.$tag";
 427
 428     # create vlan on $iface is not already exist
 429     if (! -d "/sys/class/net/$ifacevlan") {
 430         system("/sbin/ip link add link $iface name $ifacevlan type vlan id $tag") == 0 ||
 431             die "can't add vlan tag $tag to interface $iface\n";
 432
 433         # remove ipv6 link-local address before activation
 434         disable_ipv6($ifacevlan);
 435     }
 436
 437     # be sure to have the $ifacevlan up
 438     &$activate_interface($ifacevlan);
 439
 440     # test if $vlaniface is already enslaved in another bridge
 441     my $path= "/sys/class/net/$ifacevlan/brport/bridge";
 442     if (-l $path) {
 443         my $tbridge = basename(readlink($path));
 444         if ($tbridge ne $bridgevlan) {
 445             die "interface $ifacevlan already exist in bridge $tbridge\n";
 446         } else {
 447             # Port already attached to bridge: do nothing.
 448             return;
 449         }
 450     }
 451
 452     # add $ifacevlan to the bridge
 453     &$bridge_add_interface($bridgevlan, $ifacevlan);
 454 }
 455
 456 sub activate_bridge_vlan {
 457     my ($bridge, $tag_param) = @_;
 458
 459     die "bridge '$bridge' is not active\n" if ! -d "/sys/class/net/$bridge";
 460
 461     return $bridge if !defined($tag_param); # no vlan, simply return
 462
 463     my $tag = int($tag_param);
 464
 465     die "got strange vlan tag '$tag_param'\n" if $tag < 1 || $tag > 4094;
 466
 467     my $bridgevlan = "${bridge}v$tag";
 468
 469     my @ifaces = ();
 470     my $dir = "/sys/class/net/$bridge/brif";
 471     PVE::Tools::dir_glob_foreach($dir, '(((eth|bond)\d+|en[^.]+)(\.\d+)?)', sub {
 472         push @ifaces, $_[0];
 473     });
 474
 475     die "no physical interface on bridge '$bridge'\n" if scalar(@ifaces) == 0;
 476
 477     lock_network(sub {
 478         # add bridgevlan if it doesn't already exist
 479         if (! -d "/sys/class/net/$bridgevlan") {
 480             system("/sbin/brctl addbr $bridgevlan") == 0 ||
 481                 die "can't add bridge $bridgevlan\n";
 482         }
 483
 484         # for each physical interface (eth or bridge) bind them to bridge vlan
 485         foreach my $iface (@ifaces) {
 486             activate_bridge_vlan_slave($bridgevlan, $iface, $tag);
 487         }
 488
 489         #fixme: set other bridge flags
 490
 491         # remove ipv6 link-local address before activation
 492         disable_ipv6($bridgevlan);
 493         # be sure to have the bridge up
 494         &$activate_interface($bridgevlan);
 495     });
 496     return $bridgevlan;
 497 }
 498
 499 sub tcp_ping {
 500     my ($host, $port, $timeout) = @_;
 501
 502     my $refused = 1;
 503
 504     $timeout = 3 if !$timeout; # sane default
 505     if (!$port) {
 506         # Net::Ping defaults to the echo port
 507         $port = 7;
 508     } else {
 509         # Net::Ping's port_number() implies service_check(1)
 510         $refused = 0;
 511     }
 512
 513     my ($sock, $result);
 514     eval {
 515         $result = PVE::Tools::run_with_timeout($timeout, sub {
 516             $sock = IO::Socket::IP->new(PeerHost => $host, PeerPort => $port, Type => SOCK_STREAM);
 517             $result = $refused if $! == ECONNREFUSED;
 518         });
 519     };
 520     if ($sock) {
 521         $sock->close();
 522         $result = 1;
 523     }
 524     return $result;
 525 }
 526
 527 sub IP_from_cidr {
 528     my ($cidr, $version) = @_;
 529
 530     return if $cidr !~ m!^(\S+?)/(\S+)$!;
 531     my ($ip, $prefix) = ($1, $2);
 532
 533     my $ipobj = Net::IP->new($ip, $version);
 534     return if !$ipobj;
 535
 536     $version = $ipobj->version();
 537
 538     my $binmask = Net::IP::ip_get_mask($prefix, $version);
 539     return if !$binmask;
 540
 541     my $masked_binip = $ipobj->binip() & $binmask;
 542     my $masked_ip = Net::IP::ip_bintoip($masked_binip, $version);
 543     return Net::IP->new("$masked_ip/$prefix");
 544 }
 545
 546 sub is_ip_in_cidr {
 547     my ($ip, $cidr, $version) = @_;
 548
 549     my $cidr_obj = IP_from_cidr($cidr, $version);
 550     return undef if !$cidr_obj;
 551
 552     my $ip_obj = Net::IP->new($ip, $version);
 553     return undef if !$ip_obj;
 554
 555     return $cidr_obj->overlaps($ip_obj) == $Net::IP::IP_B_IN_A_OVERLAP;
 556 }
 557
 558
 559 sub get_local_ip_from_cidr {
 560     my ($cidr) = @_;
 561
 562     my $cmd = ['/sbin/ip', 'address', 'show', 'to', $cidr, 'up'];
 563
 564     my $IPs = [];
 565
 566     my $code = sub {
 567         my $line = shift;
 568
 569         if ($line =~ m!^\s*inet(?:6)?\s+($PVE::Tools::IPRE)/\d+!) {
 570             push @$IPs, $1;
 571         }
 572     };
 573
 574     PVE::Tools::run_command($cmd, outfunc => $code);
 575
 576     return $IPs;
 577 }
 578
 579 sub addr_to_ip {
 580     my ($addr) = @_;
 581     my ($err, $host, $port) = Socket::getnameinfo($addr, NI_NUMERICHOST | NI_NUMERICSERV);
 582     die "failed to get numerical host address: $err\n" if $err;
 583     return ($host, $port) if wantarray;
 584     return $host;
 585 }
 586
 587 sub get_ip_from_hostname {
 588     my ($hostname, $noerr) = @_;
 589
 590     my ($family, $ip);
 591
 592     eval {
 593         my @res = PVE::Tools::getaddrinfo_all($hostname);
 594         $family = $res[0]->{family};
 595         $ip = addr_to_ip($res[0]->{addr})
 596     };
 597     if ($@) {
 598         die "hostname lookup failed:\n$@" if !$noerr;
 599         return undef;
 600     }
 601
 602     if ($ip =~ m/^127\.|^::1$/) {
 603         die "hostname lookup failed - got local IP address ($hostname = $ip)\n" if !$noerr;
 604         return undef;
 605     }
 606
 607     return wantarray ? ($ip, $family) : $ip;
 608 }
 609
 610 sub lock_network {
 611     my ($code, @param) = @_;
 612     my $res = lock_file('/var/lock/pve-network.lck', 10, $code, @param);
 613     die $@ if $@;
 614     return $res;
 615 }
 616
 617 1;