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 $PHYSICAL_NIC_RE = qr/(?:eth\d+|en[^:.]+|ib\d+)/;
  18
  19 our $ipv4_reverse_mask = [
  20     '0.0.0.0',
  21     '128.0.0.0',
  22     '192.0.0.0',
  23     '224.0.0.0',
  24     '240.0.0.0',
  25     '248.0.0.0',
  26     '252.0.0.0',
  27     '254.0.0.0',
  28     '255.0.0.0',
  29     '255.128.0.0',
  30     '255.192.0.0',
  31     '255.224.0.0',
  32     '255.240.0.0',
  33     '255.248.0.0',
  34     '255.252.0.0',
  35     '255.254.0.0',
  36     '255.255.0.0',
  37     '255.255.128.0',
  38     '255.255.192.0',
  39     '255.255.224.0',
  40     '255.255.240.0',
  41     '255.255.248.0',
  42     '255.255.252.0',
  43     '255.255.254.0',
  44     '255.255.255.0',
  45     '255.255.255.128',
  46     '255.255.255.192',
  47     '255.255.255.224',
  48     '255.255.255.240',
  49     '255.255.255.248',
  50     '255.255.255.252',
  51     '255.255.255.254',
  52     '255.255.255.255',
  53 ];
  54
  55 our $ipv4_mask_hash_localnet = {
  56     '255.0.0.0' => 8,
  57     '255.128.0.0' => 9,
  58     '255.192.0.0' => 10,
  59     '255.224.0.0' => 11,
  60     '255.240.0.0' => 12,
  61     '255.248.0.0' => 13,
  62     '255.252.0.0' => 14,
  63     '255.254.0.0' => 15,
  64     '255.255.0.0' => 16,
  65     '255.255.128.0' => 17,
  66     '255.255.192.0' => 18,
  67     '255.255.224.0' => 19,
  68     '255.255.240.0' => 20,
  69     '255.255.248.0' => 21,
  70     '255.255.252.0' => 22,
  71     '255.255.254.0' => 23,
  72     '255.255.255.0' => 24,
  73     '255.255.255.128' => 25,
  74     '255.255.255.192' => 26,
  75     '255.255.255.224' => 27,
  76     '255.255.255.240' => 28,
  77     '255.255.255.248' => 29,
  78     '255.255.255.252' => 30,
  79     '255.255.255.254' => 31,
  80     '255.255.255.255' => 32,
  81 };
  82
  83 sub setup_tc_rate_limit {
  84     my ($iface, $rate, $burst, $debug) = @_;
  85
  86     # these are allowed / expected to fail, e.g. when there is no previous rate limit to remove
  87     eval { run_command("/sbin/tc class del dev $iface parent 1: classid 1:1 >/dev/null 2>&1"); };
  88     eval { run_command("/sbin/tc filter del dev $iface parent ffff: protocol all pref 50 u32 >/dev/null 2>&1"); };
  89     eval { run_command("/sbin/tc qdisc del dev $iface ingress >/dev/null 2>&1"); };
  90     eval { run_command("/sbin/tc qdisc del dev $iface root >/dev/null 2>&1"); };
  91
  92     return if !$rate;
  93
  94     # tbf does not work for unknown reason
  95     #$TC qdisc add dev $DEV root tbf rate $RATE latency 100ms burst $BURST
  96     # so we use htb instead
  97     run_command("/sbin/tc qdisc add dev $iface root handle 1: htb default 1");
  98     run_command("/sbin/tc class add dev $iface parent 1: classid 1:1 " .
  99                 "htb rate ${rate}bps burst ${burst}b");
 100
 101     run_command("/sbin/tc qdisc add dev $iface handle ffff: ingress");
 102     run_command("/sbin/tc filter add dev $iface parent ffff: " .
 103                 "prio 50 basic " .
 104                 "police rate ${rate}bps burst ${burst}b mtu 64kb " .
 105                 "drop flowid :1");
 106
 107     if ($debug) {
 108         print "DEBUG tc settings\n";
 109         system("/sbin/tc qdisc ls dev $iface");
 110         system("/sbin/tc class ls dev $iface");
 111         system("/sbin/tc filter ls dev $iface parent ffff:");
 112     }
 113 }
 114
 115 sub tap_rate_limit {
 116     my ($iface, $rate) = @_;
 117
 118     my $debug = 0;
 119     $rate = int($rate*1024*1024) if $rate;
 120     my $burst = 1024*1024;
 121
 122     setup_tc_rate_limit($iface, $rate, $burst, $debug);
 123 }
 124
 125 my $read_bridge_mtu = sub {
 126     my ($bridge) = @_;
 127
 128     my $mtu = PVE::Tools::file_read_firstline("/sys/class/net/$bridge/mtu");
 129     die "bridge '$bridge' does not exist\n" if !$mtu;
 130     # avoid insecure dependency;
 131     die "unable to parse mtu value" if $mtu !~ /^(\d+)$/;
 132     $mtu = int($1);
 133
 134     return $mtu;
 135 };
 136
 137 my $parse_tap_device_name = sub {
 138     my ($iface, $noerr) = @_;
 139
 140     my ($vmid, $devid);
 141
 142     if ($iface =~ m/^tap(\d+)i(\d+)$/) {
 143         $vmid = $1;
 144         $devid = $2;
 145     } elsif ($iface =~ m/^veth(\d+)i(\d+)$/) {
 146         $vmid = $1;
 147         $devid = $2;
 148     } else {
 149         return undef if $noerr;
 150         die "can't create firewall bridge for random interface name '$iface'\n";
 151     }
 152
 153     return ($vmid, $devid);
 154 };
 155
 156 my $compute_fwbr_names = sub {
 157     my ($vmid, $devid) = @_;
 158
 159     my $fwbr = "fwbr${vmid}i${devid}";
 160     # Note: the firewall use 'fwln+' to filter traffic to VMs
 161     my $vethfw = "fwln${vmid}i${devid}";
 162     my $vethfwpeer = "fwpr${vmid}p${devid}";
 163     my $ovsintport = "fwln${vmid}o${devid}";
 164
 165     return ($fwbr, $vethfw, $vethfwpeer, $ovsintport);
 166 };
 167
 168 my $cond_create_bridge = sub {
 169     my ($bridge) = @_;
 170
 171     if (! -d "/sys/class/net/$bridge") {
 172         system("/sbin/brctl addbr $bridge") == 0 ||
 173             die "can't add bridge '$bridge'\n";
 174         disable_ipv6($bridge);
 175     }
 176 };
 177
 178 sub disable_ipv6 {
 179     my ($iface) = @_;
 180     return if !-d '/proc/sys/net/ipv6'; # ipv6 might be completely disabled
 181     my $file = "/proc/sys/net/ipv6/conf/$iface/disable_ipv6";
 182     open(my $fh, '>', $file) or die "failed to open $file for writing: $!\n";
 183     print {$fh} "1\n" or die "failed to disable link-local ipv6 for $iface\n";
 184     close($fh);
 185 }
 186
 187 my $bridge_add_interface = sub {
 188     my ($bridge, $iface, $tag, $trunks) = @_;
 189
 190     # drop link local address (it can't be used when on a bridge anyway)
 191     disable_ipv6($iface);
 192     system("/sbin/brctl addif $bridge $iface") == 0 ||
 193         die "can't add interface 'iface' to bridge '$bridge'\n";
 194
 195    my $vlan_aware = PVE::Tools::file_read_firstline("/sys/class/net/$bridge/bridge/vlan_filtering");
 196
 197    if ($vlan_aware) {
 198         if ($tag) {
 199             system({'/sbin/bridge'} 'bridge', 'vlan', 'del', 'dev', $iface, 'vid', '1-4094') == 0
 200                 or die "failed to remove default vlan tags of $iface\n";
 201             system({'/sbin/bridge'} 'bridge', 'vlan', 'add', 'dev', $iface, 'vid', $tag, 'pvid', 'untagged') == 0
 202                 or die "unable to add vlan $tag to interface $iface\n";
 203
 204             warn "Caution: Setting VLAN ID 1 on a VLAN aware bridge may be dangerous\n" if $tag == 1;
 205         } else {
 206             system("/sbin/bridge vlan add dev $iface vid 2-4094") == 0 ||
 207             die "unable to add default vlan tags to interface $iface\n" if !$trunks;
 208         }
 209
 210         if ($trunks) {
 211             my @trunks_array = split /;/, $trunks;
 212             foreach my $trunk (@trunks_array) {
 213                 system("/sbin/bridge vlan add dev $iface vid $trunk") == 0 ||
 214                 die "unable to add vlan $trunk to interface $iface\n";
 215             }
 216         }
 217    }
 218 };
 219
 220 my $ovs_bridge_add_port = sub {
 221     my ($bridge, $iface, $tag, $internal, $trunks) = @_;
 222
 223     $trunks =~ s/;/,/g if $trunks;
 224
 225     my $cmd = "/usr/bin/ovs-vsctl add-port $bridge $iface";
 226     $cmd .= " tag=$tag" if $tag;
 227     $cmd .= " trunks=". join(',', $trunks) if $trunks;
 228     $cmd .= " vlan_mode=native-untagged" if $tag && $trunks;
 229
 230     $cmd .= " -- set Interface $iface type=internal" if $internal;
 231     system($cmd) == 0 ||
 232         die "can't add ovs port '$iface'\n";
 233     disable_ipv6($iface);
 234 };
 235
 236 my $activate_interface = sub {
 237     my ($iface) = @_;
 238
 239     system("/sbin/ip link set $iface up") == 0 ||
 240         die "can't activate interface '$iface'\n";
 241 };
 242
 243 sub tap_create {
 244     my ($iface, $bridge) = @_;
 245
 246     die "unable to get bridge setting\n" if !$bridge;
 247
 248     my $bridgemtu = &$read_bridge_mtu($bridge);
 249
 250     eval {
 251         disable_ipv6($iface);
 252         PVE::Tools::run_command(['/sbin/ip', 'link', 'set', $iface, 'up', 'promisc', 'on', 'mtu', $bridgemtu]);
 253     };
 254     die "interface activation failed\n" if $@;
 255 }
 256
 257 sub veth_create {
 258     my ($veth, $vethpeer, $bridge, $mac) = @_;
 259
 260     die "unable to get bridge setting\n" if !$bridge;
 261
 262     my $bridgemtu = &$read_bridge_mtu($bridge);
 263
 264     # create veth pair
 265     if (! -d "/sys/class/net/$veth") {
 266         my $cmd = "/sbin/ip link add name $veth type veth peer name $vethpeer mtu $bridgemtu";
 267         $cmd .= " addr $mac" if $mac;
 268         system($cmd) == 0 || die "can't create interface $veth\n";
 269     }
 270
 271     # up vethpair
 272     disable_ipv6($veth);
 273     disable_ipv6($vethpeer);
 274     &$activate_interface($veth);
 275     &$activate_interface($vethpeer);
 276 }
 277
 278 sub veth_delete {
 279     my ($veth) = @_;
 280
 281     if (-d "/sys/class/net/$veth") {
 282         run_command("/sbin/ip link delete dev $veth", outfunc => sub {}, errfunc => sub {});
 283     }
 284     eval { tap_unplug($veth) };
 285 }
 286
 287 my $create_firewall_bridge_linux = sub {
 288     my ($iface, $bridge, $tag, $trunks) = @_;
 289
 290     my ($vmid, $devid) = &$parse_tap_device_name($iface);
 291     my ($fwbr, $vethfw, $vethfwpeer) = &$compute_fwbr_names($vmid, $devid);
 292
 293     &$cond_create_bridge($fwbr);
 294     &$activate_interface($fwbr);
 295
 296     copy_bridge_config($bridge, $fwbr);
 297     veth_create($vethfw, $vethfwpeer, $bridge);
 298
 299     &$bridge_add_interface($fwbr, $vethfw);
 300     &$bridge_add_interface($bridge, $vethfwpeer, $tag, $trunks);
 301
 302     &$bridge_add_interface($fwbr, $iface);
 303 };
 304
 305 my $create_firewall_bridge_ovs = sub {
 306     my ($iface, $bridge, $tag, $trunks) = @_;
 307
 308     my ($vmid, $devid) = &$parse_tap_device_name($iface);
 309     my ($fwbr, undef, undef, $ovsintport) = &$compute_fwbr_names($vmid, $devid);
 310
 311     my $bridgemtu = &$read_bridge_mtu($bridge);
 312
 313     &$cond_create_bridge($fwbr);
 314     &$activate_interface($fwbr);
 315
 316     &$bridge_add_interface($fwbr, $iface);
 317
 318     &$ovs_bridge_add_port($bridge, $ovsintport, $tag, 1, $trunks);
 319     &$activate_interface($ovsintport);
 320
 321     # set the same mtu for ovs int port
 322     PVE::Tools::run_command(['/sbin/ip', 'link', 'set', $ovsintport, 'mtu', $bridgemtu]);
 323
 324     &$bridge_add_interface($fwbr, $ovsintport);
 325 };
 326
 327 my $cleanup_firewall_bridge = sub {
 328     my ($iface) = @_;
 329
 330     my ($vmid, $devid) = &$parse_tap_device_name($iface, 1);
 331     return if !defined($vmid);
 332     my ($fwbr, $vethfw, $vethfwpeer, $ovsintport) = &$compute_fwbr_names($vmid, $devid);
 333
 334     # cleanup old port config from any openvswitch bridge
 335     if (-d "/sys/class/net/$ovsintport") {
 336         run_command("/usr/bin/ovs-vsctl del-port $ovsintport", outfunc => sub {}, errfunc => sub {});
 337     }
 338
 339     # delete old vethfw interface
 340     veth_delete($vethfw);
 341
 342     # cleanup fwbr bridge
 343     if (-d "/sys/class/net/$fwbr") {
 344         run_command("/sbin/ip link set dev $fwbr down", outfunc => sub {}, errfunc => sub {});
 345         run_command("/sbin/brctl delbr $fwbr", outfunc => sub {}, errfunc => sub {});
 346     }
 347 };
 348
 349 sub tap_plug {
 350     my ($iface, $bridge, $tag, $firewall, $trunks, $rate) = @_;
 351
 352     #cleanup old port config from any openvswitch bridge
 353     eval {run_command("/usr/bin/ovs-vsctl del-port $iface", outfunc => sub {}, errfunc => sub {}) };
 354
 355     if (-d "/sys/class/net/$bridge/bridge") {
 356         &$cleanup_firewall_bridge($iface); # remove stale devices
 357
 358         my $vlan_aware = PVE::Tools::file_read_firstline("/sys/class/net/$bridge/bridge/vlan_filtering");
 359
 360         if (!$vlan_aware) {
 361             die "vlan aware feature need to be enabled to use trunks" if $trunks;
 362             my $newbridge = activate_bridge_vlan($bridge, $tag);
 363             copy_bridge_config($bridge, $newbridge) if $bridge ne $newbridge;
 364             $bridge = $newbridge;
 365             $tag = undef;
 366         }
 367
 368         if ($firewall) {
 369             &$create_firewall_bridge_linux($iface, $bridge, $tag, $trunks);
 370         } else {
 371             &$bridge_add_interface($bridge, $iface, $tag, $trunks);
 372         }
 373
 374     } else {
 375         &$cleanup_firewall_bridge($iface); # remove stale devices
 376
 377         if ($firewall) {
 378             &$create_firewall_bridge_ovs($iface, $bridge, $tag, $trunks);
 379         } else {
 380             &$ovs_bridge_add_port($bridge, $iface, $tag, undef, $trunks);
 381         }
 382     }
 383
 384     tap_rate_limit($iface, $rate);
 385 }
 386
 387 sub tap_unplug {
 388     my ($iface) = @_;
 389
 390     my $path= "/sys/class/net/$iface/brport/bridge";
 391     if (-l $path) {
 392         my $bridge = basename(readlink($path));
 393         #avoid insecure dependency;
 394         ($bridge) = $bridge =~ /(\S+)/;
 395
 396         system("/sbin/brctl delif $bridge $iface") == 0 ||
 397             die "can't del interface '$iface' from bridge '$bridge'\n";
 398
 399     }
 400
 401     &$cleanup_firewall_bridge($iface);
 402     #cleanup old port config from any openvswitch bridge
 403     eval {run_command("/usr/bin/ovs-vsctl del-port $iface", outfunc => sub {}, errfunc => sub {}) };
 404 }
 405
 406 sub copy_bridge_config {
 407     my ($br0, $br1) = @_;
 408
 409     return if $br0 eq $br1;
 410
 411     my $br_configs = [ 'ageing_time', 'stp_state', 'priority', 'forward_delay',
 412                        'hello_time', 'max_age', 'multicast_snooping', 'multicast_querier'];
 413
 414     foreach my $sysname (@$br_configs) {
 415         eval {
 416             my $v0 = PVE::Tools::file_read_firstline("/sys/class/net/$br0/bridge/$sysname");
 417             my $v1 = PVE::Tools::file_read_firstline("/sys/class/net/$br1/bridge/$sysname");
 418             if ($v0 ne $v1) {
 419                  PVE::ProcFSTools::write_proc_entry("/sys/class/net/$br1/bridge/$sysname", $v0);
 420             }
 421         };
 422         warn $@ if $@;
 423     }
 424 }
 425
 426 sub activate_bridge_vlan_slave {
 427     my ($bridgevlan, $iface, $tag) = @_;
 428     my $ifacevlan = "${iface}.$tag";
 429
 430     # create vlan on $iface is not already exist
 431     if (! -d "/sys/class/net/$ifacevlan") {
 432         system("/sbin/ip link add link $iface name $ifacevlan type vlan id $tag") == 0 ||
 433             die "can't add vlan tag $tag to interface $iface\n";
 434
 435         # remove ipv6 link-local address before activation
 436         disable_ipv6($ifacevlan);
 437     }
 438
 439     # be sure to have the $ifacevlan up
 440     &$activate_interface($ifacevlan);
 441
 442     # test if $vlaniface is already enslaved in another bridge
 443     my $path= "/sys/class/net/$ifacevlan/brport/bridge";
 444     if (-l $path) {
 445         my $tbridge = basename(readlink($path));
 446         if ($tbridge ne $bridgevlan) {
 447             die "interface $ifacevlan already exist in bridge $tbridge\n";
 448         } else {
 449             # Port already attached to bridge: do nothing.
 450             return;
 451         }
 452     }
 453
 454     # add $ifacevlan to the bridge
 455     &$bridge_add_interface($bridgevlan, $ifacevlan);
 456 }
 457
 458 sub activate_bridge_vlan {
 459     my ($bridge, $tag_param) = @_;
 460
 461     die "bridge '$bridge' is not active\n" if ! -d "/sys/class/net/$bridge";
 462
 463     return $bridge if !defined($tag_param); # no vlan, simply return
 464
 465     my $tag = int($tag_param);
 466
 467     die "got strange vlan tag '$tag_param'\n" if $tag < 1 || $tag > 4094;
 468
 469     my $bridgevlan = "${bridge}v$tag";
 470
 471     my @ifaces = ();
 472     my $dir = "/sys/class/net/$bridge/brif";
 473     PVE::Tools::dir_glob_foreach($dir, '(((eth|bond)\d+|en[^.]+)(\.\d+)?)', sub {
 474         push @ifaces, $_[0];
 475     });
 476
 477     die "no physical interface on bridge '$bridge'\n" if scalar(@ifaces) == 0;
 478
 479     lock_network(sub {
 480         # add bridgevlan if it doesn't already exist
 481         if (! -d "/sys/class/net/$bridgevlan") {
 482             system("/sbin/brctl addbr $bridgevlan") == 0 ||
 483                 die "can't add bridge $bridgevlan\n";
 484         }
 485
 486         # for each physical interface (eth or bridge) bind them to bridge vlan
 487         foreach my $iface (@ifaces) {
 488             activate_bridge_vlan_slave($bridgevlan, $iface, $tag);
 489         }
 490
 491         #fixme: set other bridge flags
 492
 493         # remove ipv6 link-local address before activation
 494         disable_ipv6($bridgevlan);
 495         # be sure to have the bridge up
 496         &$activate_interface($bridgevlan);
 497     });
 498     return $bridgevlan;
 499 }
 500
 501 sub tcp_ping {
 502     my ($host, $port, $timeout) = @_;
 503
 504     my $refused = 1;
 505
 506     $timeout = 3 if !$timeout; # sane default
 507     if (!$port) {
 508         # Net::Ping defaults to the echo port
 509         $port = 7;
 510     } else {
 511         # Net::Ping's port_number() implies service_check(1)
 512         $refused = 0;
 513     }
 514
 515     my ($sock, $result);
 516     eval {
 517         $result = PVE::Tools::run_with_timeout($timeout, sub {
 518             $sock = IO::Socket::IP->new(PeerHost => $host, PeerPort => $port, Type => SOCK_STREAM);
 519             $result = $refused if $! == ECONNREFUSED;
 520         });
 521     };
 522     if ($sock) {
 523         $sock->close();
 524         $result = 1;
 525     }
 526     return $result;
 527 }
 528
 529 sub IP_from_cidr {
 530     my ($cidr, $version) = @_;
 531
 532     return if $cidr !~ m!^(\S+?)/(\S+)$!;
 533     my ($ip, $prefix) = ($1, $2);
 534
 535     my $ipobj = Net::IP->new($ip, $version);
 536     return if !$ipobj;
 537
 538     $version = $ipobj->version();
 539
 540     my $binmask = Net::IP::ip_get_mask($prefix, $version);
 541     return if !$binmask;
 542
 543     my $masked_binip = $ipobj->binip() & $binmask;
 544     my $masked_ip = Net::IP::ip_bintoip($masked_binip, $version);
 545     return Net::IP->new("$masked_ip/$prefix");
 546 }
 547
 548 sub is_ip_in_cidr {
 549     my ($ip, $cidr, $version) = @_;
 550
 551     my $cidr_obj = IP_from_cidr($cidr, $version);
 552     return undef if !$cidr_obj;
 553
 554     my $ip_obj = Net::IP->new($ip, $version);
 555     return undef if !$ip_obj;
 556
 557     return $cidr_obj->overlaps($ip_obj) == $Net::IP::IP_B_IN_A_OVERLAP;
 558 }
 559
 560
 561 sub get_local_ip_from_cidr {
 562     my ($cidr) = @_;
 563
 564     my $cmd = ['/sbin/ip', 'address', 'show', 'to', $cidr, 'up'];
 565
 566     my $IPs = [];
 567
 568     my $code = sub {
 569         my $line = shift;
 570
 571         if ($line =~ m!^\s*inet(?:6)?\s+($PVE::Tools::IPRE)/\d+!) {
 572             push @$IPs, $1;
 573         }
 574     };
 575
 576     PVE::Tools::run_command($cmd, outfunc => $code);
 577
 578     return $IPs;
 579 }
 580
 581 sub addr_to_ip {
 582     my ($addr) = @_;
 583     my ($err, $host, $port) = Socket::getnameinfo($addr, NI_NUMERICHOST | NI_NUMERICSERV);
 584     die "failed to get numerical host address: $err\n" if $err;
 585     return ($host, $port) if wantarray;
 586     return $host;
 587 }
 588
 589 sub get_ip_from_hostname {
 590     my ($hostname, $noerr) = @_;
 591
 592     my ($family, $ip);
 593
 594     eval {
 595         my @res = PVE::Tools::getaddrinfo_all($hostname);
 596         $family = $res[0]->{family};
 597         $ip = addr_to_ip($res[0]->{addr})
 598     };
 599     if ($@) {
 600         die "hostname lookup '$hostname' failed - $@" if !$noerr;
 601         return undef;
 602     }
 603
 604     if ($ip =~ m/^127\.|^::1$/) {
 605         die "hostname lookup '$hostname' failed - got local IP address '$ip'\n" if !$noerr;
 606         return undef;
 607     }
 608
 609     return wantarray ? ($ip, $family) : $ip;
 610 }
 611
 612 sub lock_network {
 613     my ($code, @param) = @_;
 614     my $res = lock_file('/var/lock/pve-network.lck', 10, $code, @param);
 615     die $@ if $@;
 616     return $res;
 617 }
 618
 619 1;