src/PVE/Network.pm

   1 package PVE::Network;
   2
   3 use strict;
   4 use warnings;
   5 use PVE::Tools qw(run_command);
   6 use PVE::ProcFSTools;
   7 use PVE::INotify;
   8 use File::Basename;
   9 use IO::Socket::IP;
  10 use POSIX qw(ECONNREFUSED);
  11
  12 use Net::IP;
  13
  14 use Socket qw(IPPROTO_IP);
  15
  16 use constant IFF_UP => 1;
  17 use constant IFNAMSIZ => 16;
  18 use constant SIOCGIFFLAGS => 0x8913;
  19
  20 # host network related utility functions
  21
  22 our $ipv4_reverse_mask = [
  23     '0.0.0.0',
  24     '128.0.0.0',
  25     '192.0.0.0',
  26     '224.0.0.0',
  27     '240.0.0.0',
  28     '248.0.0.0',
  29     '252.0.0.0',
  30     '254.0.0.0',
  31     '255.0.0.0',
  32     '255.128.0.0',
  33     '255.192.0.0',
  34     '255.224.0.0',
  35     '255.240.0.0',
  36     '255.248.0.0',
  37     '255.252.0.0',
  38     '255.254.0.0',
  39     '255.255.0.0',
  40     '255.255.128.0',
  41     '255.255.192.0',
  42     '255.255.224.0',
  43     '255.255.240.0',
  44     '255.255.248.0',
  45     '255.255.252.0',
  46     '255.255.254.0',
  47     '255.255.255.0',
  48     '255.255.255.128',
  49     '255.255.255.192',
  50     '255.255.255.224',
  51     '255.255.255.240',
  52     '255.255.255.248',
  53     '255.255.255.252',
  54     '255.255.255.254',
  55     '255.255.255.255',
  56 ];
  57
  58 our $ipv4_mask_hash_localnet = {
  59     '255.255.0.0' => 16,
  60     '255.255.128.0' => 17,
  61     '255.255.192.0' => 18,
  62     '255.255.224.0' => 19,
  63     '255.255.240.0' => 20,
  64     '255.255.248.0' => 21,
  65     '255.255.252.0' => 22,
  66     '255.255.254.0' => 23,
  67     '255.255.255.0' => 24,
  68     '255.255.255.128' => 25,
  69     '255.255.255.192' => 26,
  70     '255.255.255.224' => 27,
  71     '255.255.255.240' => 28,
  72     '255.255.255.248' => 29,
  73     '255.255.255.252' => 30,
  74     '255.255.255.254' => 31,
  75     '255.255.255.255' => 32,
  76 };
  77
  78 sub setup_tc_rate_limit {
  79     my ($iface, $rate, $burst, $debug) = @_;
  80
  81     # these are allowed / expected to fail, e.g. when there is no previous rate limit to remove
  82     eval { run_command("/sbin/tc class del dev $iface parent 1: classid 1:1 >/dev/null 2>&1"); };
  83     eval { run_command("/sbin/tc filter del dev $iface parent ffff: protocol all pref 50 u32 >/dev/null 2>&1"); };
  84     eval { run_command("/sbin/tc qdisc del dev $iface ingress >/dev/null 2>&1"); };
  85     eval { run_command("/sbin/tc qdisc del dev $iface root >/dev/null 2>&1"); };
  86
  87     return if !$rate;
  88
  89     # tbf does not work for unknown reason
  90     #$TC qdisc add dev $DEV root tbf rate $RATE latency 100ms burst $BURST
  91     # so we use htb instead
  92     run_command("/sbin/tc qdisc add dev $iface root handle 1: htb default 1");
  93     run_command("/sbin/tc class add dev $iface parent 1: classid 1:1 " .
  94                 "htb rate ${rate}bps burst ${burst}b");
  95
  96     run_command("/sbin/tc qdisc add dev $iface handle ffff: ingress");
  97     run_command("/sbin/tc filter add dev $iface parent ffff: " .
  98                 "prio 50 basic " .
  99                 "police rate ${rate}bps burst ${burst}b mtu 64kb " .
 100                 "drop flowid :1");
 101
 102     if ($debug) {
 103         print "DEBUG tc settings\n";
 104         system("/sbin/tc qdisc ls dev $iface");
 105         system("/sbin/tc class ls dev $iface");
 106         system("/sbin/tc filter ls dev $iface parent ffff:");
 107     }
 108 }
 109
 110 sub tap_rate_limit {
 111     my ($iface, $rate) = @_;
 112
 113     my $debug = 0;
 114     $rate = int($rate*1024*1024) if $rate;
 115     my $burst = 1024*1024;
 116
 117     setup_tc_rate_limit($iface, $rate, $burst, $debug);
 118 }
 119
 120 my $read_bridge_mtu = sub {
 121     my ($bridge) = @_;
 122
 123     my $mtu = PVE::Tools::file_read_firstline("/sys/class/net/$bridge/mtu");
 124     die "bridge '$bridge' does not exist\n" if !$mtu;
 125     # avoid insecure dependency;
 126     die "unable to parse mtu value" if $mtu !~ /^(\d+)$/;
 127     $mtu = int($1);
 128
 129     return $mtu;
 130 };
 131
 132 my $parse_tap_device_name = sub {
 133     my ($iface, $noerr) = @_;
 134
 135     my ($vmid, $devid);
 136
 137     if ($iface =~ m/^tap(\d+)i(\d+)$/) {
 138         $vmid = $1;
 139         $devid = $2;
 140     } elsif ($iface =~ m/^veth(\d+)i(\d+)$/) {
 141         $vmid = $1;
 142         $devid = $2;
 143     } else {
 144         return undef if $noerr;
 145         die "can't create firewall bridge for random interface name '$iface'\n";
 146     }
 147
 148     return ($vmid, $devid);
 149 };
 150
 151 my $compute_fwbr_names = sub {
 152     my ($vmid, $devid) = @_;
 153
 154     my $fwbr = "fwbr${vmid}i${devid}";
 155     # Note: the firewall use 'fwln+' to filter traffic to VMs
 156     my $vethfw = "fwln${vmid}i${devid}";
 157     my $vethfwpeer = "fwpr${vmid}p${devid}";
 158     my $ovsintport = "fwln${vmid}o${devid}";
 159
 160     return ($fwbr, $vethfw, $vethfwpeer, $ovsintport);
 161 };
 162
 163 my $cond_create_bridge = sub {
 164     my ($bridge) = @_;
 165
 166     if (! -d "/sys/class/net/$bridge") {
 167         system("/sbin/brctl addbr $bridge") == 0 ||
 168             die "can't add bridge '$bridge'\n";
 169     }
 170 };
 171
 172 my $bridge_add_interface = sub {
 173     my ($bridge, $iface, $tag, $trunks) = @_;
 174
 175     system("/sbin/brctl addif $bridge $iface") == 0 ||
 176         die "can't add interface 'iface' to bridge '$bridge'\n";
 177
 178    my $vlan_aware = PVE::Tools::file_read_firstline("/sys/class/net/$bridge/bridge/vlan_filtering");
 179
 180    if ($vlan_aware) {
 181         if ($tag) {
 182             system("/sbin/bridge vlan add dev $iface vid $tag pvid untagged") == 0 ||
 183             die "unable to add vlan $tag to interface $iface\n";
 184
 185             warn "Caution: Setting VLAN ID 1 on a VLAN aware bridge may be dangerous\n" if $tag == 1;
 186         } else {
 187             system("/sbin/bridge vlan add dev $iface vid 2-4094") == 0 ||
 188             die "unable to add default vlan tags to interface $iface\n" if !$trunks;
 189         }
 190
 191         if ($trunks) {
 192             my @trunks_array = split /;/, $trunks;
 193             foreach my $trunk (@trunks_array) {
 194                 system("/sbin/bridge vlan add dev $iface vid $trunk") == 0 ||
 195                 die "unable to add vlan $trunk to interface $iface\n";
 196             }
 197         }
 198    }
 199 };
 200
 201 my $ovs_bridge_add_port = sub {
 202     my ($bridge, $iface, $tag, $internal, $trunks) = @_;
 203
 204     $trunks =~ s/;/,/g if $trunks;
 205
 206     my $cmd = "/usr/bin/ovs-vsctl add-port $bridge $iface";
 207     $cmd .= " tag=$tag" if $tag;
 208     $cmd .= " trunks=". join(',', $trunks) if $trunks;
 209     $cmd .= " vlan_mode=native-untagged" if $tag && $trunks;
 210
 211     $cmd .= " -- set Interface $iface type=internal" if $internal;
 212     system($cmd) == 0 ||
 213         die "can't add ovs port '$iface'\n";
 214 };
 215
 216 my $activate_interface = sub {
 217     my ($iface) = @_;
 218
 219     system("/sbin/ip link set $iface up") == 0 ||
 220         die "can't activate interface '$iface'\n";
 221 };
 222
 223 sub tap_create {
 224     my ($iface, $bridge) = @_;
 225
 226     die "unable to get bridge setting\n" if !$bridge;
 227
 228     my $bridgemtu = &$read_bridge_mtu($bridge);
 229
 230     eval {
 231         PVE::Tools::run_command("/sbin/ifconfig $iface 0.0.0.0 promisc up mtu $bridgemtu");
 232     };
 233     die "interface activation failed\n" if $@;
 234 }
 235
 236 sub veth_create {
 237     my ($veth, $vethpeer, $bridge, $mac) = @_;
 238
 239     die "unable to get bridge setting\n" if !$bridge;
 240
 241     my $bridgemtu = &$read_bridge_mtu($bridge);
 242
 243     # create veth pair
 244     if (! -d "/sys/class/net/$veth") {
 245         my $cmd = "/sbin/ip link add name $veth type veth peer name $vethpeer mtu $bridgemtu";
 246         $cmd .= " addr $mac" if $mac;
 247         system($cmd) == 0 || die "can't create interface $veth\n";
 248     }
 249
 250     # up vethpair
 251     &$activate_interface($veth);
 252     &$activate_interface($vethpeer);
 253 }
 254
 255 sub veth_delete {
 256     my ($veth) = @_;
 257
 258     if (-d "/sys/class/net/$veth") {
 259         run_command("/sbin/ip link delete dev $veth", outfunc => sub {}, errfunc => sub {});
 260     }
 261
 262 }
 263
 264 my $create_firewall_bridge_linux = sub {
 265     my ($iface, $bridge, $tag, $trunks) = @_;
 266
 267     my ($vmid, $devid) = &$parse_tap_device_name($iface);
 268     my ($fwbr, $vethfw, $vethfwpeer) = &$compute_fwbr_names($vmid, $devid);
 269
 270     &$cond_create_bridge($fwbr);
 271     &$activate_interface($fwbr);
 272
 273     copy_bridge_config($bridge, $fwbr);
 274     veth_create($vethfw, $vethfwpeer, $bridge);
 275
 276     &$bridge_add_interface($fwbr, $vethfw);
 277     &$bridge_add_interface($bridge, $vethfwpeer, $tag, $trunks);
 278
 279     &$bridge_add_interface($fwbr, $iface);
 280 };
 281
 282 my $create_firewall_bridge_ovs = sub {
 283     my ($iface, $bridge, $tag, $trunks) = @_;
 284
 285     my ($vmid, $devid) = &$parse_tap_device_name($iface);
 286     my ($fwbr, undef, undef, $ovsintport) = &$compute_fwbr_names($vmid, $devid);
 287
 288     my $bridgemtu = &$read_bridge_mtu($bridge);
 289
 290     &$cond_create_bridge($fwbr);
 291     &$activate_interface($fwbr);
 292
 293     &$bridge_add_interface($fwbr, $iface);
 294
 295     &$ovs_bridge_add_port($bridge, $ovsintport, $tag, 1, $trunks);
 296     &$activate_interface($ovsintport);
 297
 298     # set the same mtu for ovs int port
 299     PVE::Tools::run_command("/sbin/ifconfig $ovsintport mtu $bridgemtu");
 300
 301     &$bridge_add_interface($fwbr, $ovsintport);
 302 };
 303
 304 my $cleanup_firewall_bridge = sub {
 305     my ($iface) = @_;
 306
 307     my ($vmid, $devid) = &$parse_tap_device_name($iface, 1);
 308     return if !defined($vmid);
 309     my ($fwbr, $vethfw, $vethfwpeer, $ovsintport) = &$compute_fwbr_names($vmid, $devid);
 310
 311     # cleanup old port config from any openvswitch bridge
 312     if (-d "/sys/class/net/$ovsintport") {
 313         run_command("/usr/bin/ovs-vsctl del-port $ovsintport", outfunc => sub {}, errfunc => sub {});
 314     }
 315
 316     # delete old vethfw interface
 317     veth_delete($vethfw);
 318
 319     # cleanup fwbr bridge
 320     if (-d "/sys/class/net/$fwbr") {
 321         run_command("/sbin/ip link set dev $fwbr down", outfunc => sub {}, errfunc => sub {});
 322         run_command("/sbin/brctl delbr $fwbr", outfunc => sub {}, errfunc => sub {});
 323     }
 324 };
 325
 326 sub tap_plug {
 327     my ($iface, $bridge, $tag, $firewall, $trunks, $rate) = @_;
 328
 329     #cleanup old port config from any openvswitch bridge
 330     eval {run_command("/usr/bin/ovs-vsctl del-port $iface", outfunc => sub {}, errfunc => sub {}) };
 331
 332     if (-d "/sys/class/net/$bridge/bridge") {
 333         &$cleanup_firewall_bridge($iface); # remove stale devices
 334
 335         my $vlan_aware = PVE::Tools::file_read_firstline("/sys/class/net/$bridge/bridge/vlan_filtering");
 336
 337         if (!$vlan_aware) {
 338             die "vlan aware feature need to be enabled to use trunks" if $trunks;
 339             my $newbridge = activate_bridge_vlan($bridge, $tag);
 340             copy_bridge_config($bridge, $newbridge) if $bridge ne $newbridge;
 341             $bridge = $newbridge;
 342             $tag = undef;
 343         }
 344
 345         if ($firewall) {
 346             &$create_firewall_bridge_linux($iface, $bridge, $tag, $trunks);
 347         } else {
 348             &$bridge_add_interface($bridge, $iface, $tag, $trunks);
 349         }
 350
 351     } else {
 352         &$cleanup_firewall_bridge($iface); # remove stale devices
 353
 354         if ($firewall) {
 355             &$create_firewall_bridge_ovs($iface, $bridge, $tag, $trunks);
 356         } else {
 357             &$ovs_bridge_add_port($bridge, $iface, $tag, undef, $trunks);
 358         }
 359     }
 360
 361     tap_rate_limit($iface, $rate);
 362 }
 363
 364 sub tap_unplug {
 365     my ($iface) = @_;
 366
 367     my $path= "/sys/class/net/$iface/brport/bridge";
 368     if (-l $path) {
 369         my $bridge = basename(readlink($path));
 370         #avoid insecure dependency;
 371         ($bridge) = $bridge =~ /(\S+)/;
 372
 373         system("/sbin/brctl delif $bridge $iface") == 0 ||
 374             die "can't del interface '$iface' from bridge '$bridge'\n";
 375
 376     }
 377
 378     &$cleanup_firewall_bridge($iface);
 379     #cleanup old port config from any openvswitch bridge
 380     eval {run_command("/usr/bin/ovs-vsctl del-port $iface", outfunc => sub {}, errfunc => sub {}) };
 381 }
 382
 383 sub copy_bridge_config {
 384     my ($br0, $br1) = @_;
 385
 386     return if $br0 eq $br1;
 387
 388     my $br_configs = [ 'ageing_time', 'stp_state', 'priority', 'forward_delay',
 389                        'hello_time', 'max_age', 'multicast_snooping', 'multicast_querier'];
 390
 391     foreach my $sysname (@$br_configs) {
 392         eval {
 393             my $v0 = PVE::Tools::file_read_firstline("/sys/class/net/$br0/bridge/$sysname");
 394             my $v1 = PVE::Tools::file_read_firstline("/sys/class/net/$br1/bridge/$sysname");
 395             if ($v0 ne $v1) {
 396                  PVE::ProcFSTools::write_proc_entry("/sys/class/net/$br1/bridge/$sysname", $v0);
 397             }
 398         };
 399         warn $@ if $@;
 400     }
 401 }
 402
 403 sub activate_bridge_vlan_slave {
 404     my ($bridgevlan, $iface, $tag) = @_;
 405     my $ifacevlan = "${iface}.$tag";
 406
 407     # create vlan on $iface is not already exist
 408     if (! -d "/sys/class/net/$ifacevlan") {
 409         system("/sbin/ip link add link $iface name ${iface}.${tag} type vlan id $tag") == 0 ||
 410             die "can't add vlan tag $tag to interface $iface\n";
 411     }
 412
 413     # be sure to have the $ifacevlan up
 414     &$activate_interface($ifacevlan);
 415
 416     # test if $vlaniface is already enslaved in another bridge
 417     my $path= "/sys/class/net/$ifacevlan/brport/bridge";
 418     if (-l $path) {
 419         my $tbridge = basename(readlink($path));
 420         if ($tbridge ne $bridgevlan) {
 421             die "interface $ifacevlan already exist in bridge $tbridge\n";
 422         } else {
 423             # Port already attached to bridge: do nothing.
 424             return;
 425         }
 426     }
 427
 428     # add $ifacevlan to the bridge
 429     &$bridge_add_interface($bridgevlan, $ifacevlan);
 430 }
 431
 432 sub activate_bridge_vlan {
 433     my ($bridge, $tag_param) = @_;
 434
 435     die "bridge '$bridge' is not active\n" if ! -d "/sys/class/net/$bridge";
 436
 437     return $bridge if !defined($tag_param); # no vlan, simply return
 438
 439     my $tag = int($tag_param);
 440
 441     die "got strange vlan tag '$tag_param'\n" if $tag < 1 || $tag > 4094;
 442
 443     my $bridgevlan = "${bridge}v$tag";
 444
 445     my @ifaces = ();
 446     my $dir = "/sys/class/net/$bridge/brif";
 447     PVE::Tools::dir_glob_foreach($dir, '(((eth|bond)\d+|en[^.]+)(\.\d+)?)', sub {
 448         push @ifaces, $_[0];
 449     });
 450
 451     die "no physical interface on bridge '$bridge'\n" if scalar(@ifaces) == 0;
 452
 453     # add bridgevlan if it doesn't already exist
 454     if (! -d "/sys/class/net/$bridgevlan") {
 455         system("/sbin/brctl addbr $bridgevlan") == 0 ||
 456             die "can't add bridge $bridgevlan\n";
 457     }
 458
 459     # for each physical interface (eth or bridge) bind them to bridge vlan
 460     foreach my $iface (@ifaces) {
 461         activate_bridge_vlan_slave($bridgevlan, $iface, $tag);
 462     }
 463
 464     #fixme: set other bridge flags
 465
 466     # be sure to have the bridge up
 467     system("/sbin/ip link set $bridgevlan up") == 0 ||
 468         die "can't up bridge $bridgevlan\n";
 469
 470     return $bridgevlan;
 471 }
 472
 473 sub tcp_ping {
 474     my ($host, $port, $timeout) = @_;
 475
 476     my $refused = 1;
 477
 478     $timeout = 3 if !$timeout; # sane default
 479     if (!$port) {
 480         # Net::Ping defaults to the echo port
 481         $port = 7;
 482     } else {
 483         # Net::Ping's port_number() implies service_check(1)
 484         $refused = 0;
 485     }
 486
 487     my ($sock, $result);
 488     eval {
 489         $result = PVE::Tools::run_with_timeout($timeout, sub {
 490             $sock = IO::Socket::IP->new(PeerHost => $host, PeerPort => $port, Type => SOCK_STREAM);
 491             $result = $refused if $! == ECONNREFUSED;
 492         });
 493     };
 494     if ($sock) {
 495         $sock->close();
 496         $result = 1;
 497     }
 498     return $result;
 499 }
 500
 501 sub IP_from_cidr {
 502     my ($cidr, $version) = @_;
 503
 504     return if $cidr !~ m!^(\S+?)/(\S+)$!;
 505     my ($ip, $prefix) = ($1, $2);
 506
 507     my $ipobj = Net::IP->new($ip, $version);
 508     return if !$ipobj;
 509
 510     $version = $ipobj->version();
 511
 512     my $binmask = Net::IP::ip_get_mask($prefix, $version);
 513     return if !$binmask;
 514
 515     my $masked_binip = $ipobj->binip() & $binmask;
 516     my $masked_ip = Net::IP::ip_bintoip($masked_binip, $version);
 517     return Net::IP->new("$masked_ip/$prefix");
 518 }
 519
 520 sub is_ip_in_cidr {
 521     my ($ip, $cidr, $version) = @_;
 522
 523     my $cidr_obj = IP_from_cidr($cidr, $version);
 524     return undef if !$cidr_obj;
 525
 526     my $ip_obj = Net::IP->new($ip, $version);
 527     return undef if !$ip_obj;
 528
 529     return $cidr_obj->overlaps($ip_obj) == $Net::IP::IP_B_IN_A_OVERLAP;
 530 }
 531
 532 # struct ifreq { // FOR SIOCGIFFLAGS:
 533 #   char ifrn_name[IFNAMSIZ]
 534 #   short ifru_flags
 535 # };
 536 my $STRUCT_IFREQ_SIOCGIFFLAGS = 'Z' . IFNAMSIZ . 's1';
 537 sub get_active_interfaces {
 538     # Use the interface name list from /proc/net/dev
 539     open my $fh, '<', '/proc/net/dev'
 540         or die "failed to open /proc/net/dev: $!\n";
 541     # And filter by IFF_UP flag fetched via a PF_INET6 socket ioctl:
 542     my $sock;
 543     socket($sock, PF_INET6, SOCK_DGRAM, &IPPROTO_IP)
 544     or socket($sock, PF_INET, SOCK_DGRAM, &IPPROTO_IP)
 545     or return [];
 546
 547     my $ifaces = [];
 548     while(defined(my $line = <$fh>)) {
 549         next if $line !~ /^\s*([^:\s]+):/;
 550         my $ifname = $1;
 551         my $ifreq = pack($STRUCT_IFREQ_SIOCGIFFLAGS, $ifname, 0);
 552         if (!defined(ioctl($sock, SIOCGIFFLAGS, $ifreq))) {
 553             warn "failed to get interface flags for: $ifname\n";
 554             next;
 555         }
 556         my ($name, $flags) = unpack($STRUCT_IFREQ_SIOCGIFFLAGS, $ifreq);
 557         push @$ifaces, $ifname if ($flags & IFF_UP);
 558     }
 559     close $fh;
 560     close $sock;
 561     return $ifaces;
 562 }
 563
 564 1;