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