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
  10 # host network related utility functions
  11
  12 sub setup_tc_rate_limit {
  13     my ($iface, $rate, $burst, $debug) = @_;
  14
  15     system("/sbin/tc class del dev $iface parent 1: classid 1:1 >/dev/null 2>&1");
  16     system("/sbin/tc filter del dev $iface parent ffff: protocol ip prio 50 estimator 1sec 8sec >/dev/null 2>&1");
  17     system("/sbin/tc qdisc del dev $iface ingress >/dev/null 2>&1");
  18     system("/sbin/tc qdisc del dev $iface root >/dev/null 2>&1");
  19
  20     return if !$rate;
  21
  22     run_command("/sbin/tc qdisc add dev $iface handle ffff: ingress");
  23
  24     # this does not work wit virtio - don't know why (setting "mtu 64kb" does not help)
  25     #run_command("/sbin/tc filter add dev $iface parent ffff: protocol ip prio 50 u32 match ip src 0.0.0.0/0 police rate ${rate}bps burst ${burst}b drop flowid :1");
  26     # so we use avrate instead
  27     run_command("/sbin/tc filter add dev $iface parent ffff: " .
  28                 "protocol ip prio 50 estimator 1sec 8sec " .
  29                 "u32 match ip src 0.0.0.0/0 police avrate ${rate}bps drop flowid :1");
  30
  31     # tbf does not work for unknown reason
  32     #$TC qdisc add dev $DEV root tbf rate $RATE latency 100ms burst $BURST
  33     # so we use htb instead
  34     run_command("/sbin/tc qdisc add dev $iface root handle 1: htb default 1");
  35     run_command("/sbin/tc class add dev $iface parent 1: classid 1:1 " .
  36                 "htb rate ${rate}bps burst ${burst}b");
  37
  38     if ($debug) {
  39         print "DEBUG tc settings\n";
  40         system("/sbin/tc qdisc ls dev $iface");
  41         system("/sbin/tc class ls dev $iface");
  42         system("/sbin/tc filter ls dev $iface parent ffff:");
  43     }
  44 }
  45
  46 sub tap_rate_limit {
  47     my ($iface, $rate) = @_;
  48
  49     my $debug = 0;
  50     $rate = int($rate*1024*1024);
  51     my $burst = 1024*1024;
  52
  53     setup_tc_rate_limit($iface, $rate, $burst, $debug);
  54 }
  55
  56 my $read_bridge_mtu = sub {
  57     my ($bridge) = @_;
  58
  59     my $mtu = PVE::Tools::file_read_firstline("/sys/class/net/$bridge/mtu");
  60     die "bridge '$bridge' does not exist\n" if !$mtu;
  61     # avoid insecure dependency;
  62     die "unable to parse mtu value" if $mtu !~ /^(\d+)$/;
  63     $mtu = int($1);
  64
  65     return $mtu;
  66 };
  67
  68 my $parse_tap_devive_name = sub {
  69     my ($iface, $noerr) = @_;
  70
  71     my ($vmid, $devid);
  72
  73     if ($iface =~ m/^tap(\d+)i(\d+)$/) {
  74         $vmid = $1;
  75         $devid = $2;
  76     } elsif ($iface =~ m/^veth(\d+)\.(\d+)$/) {
  77         $vmid = $1;
  78         $devid = $2;
  79     } else {
  80         return undef if $noerr;
  81         die "can't create firewall bridge for random interface name '$iface'\n";
  82     }
  83
  84     return ($vmid, $devid);
  85 };
  86
  87 my $compute_fwbr_names = sub {
  88     my ($vmid, $devid) = @_;
  89
  90     my $fwbr = "fwbr${vmid}i${devid}";
  91     # Note: the firewall use 'fwln+' to filter traffic to VMs
  92     my $vethfw = "fwln${vmid}i${devid}";
  93     my $vethfwpeer = "fwpr${vmid}p${devid}";
  94     my $ovsintport = "fwln${vmid}o${devid}";
  95
  96     return ($fwbr, $vethfw, $vethfwpeer, $ovsintport);
  97 };
  98
  99 my $cond_create_bridge = sub {
 100     my ($bridge) = @_;
 101
 102     if (! -d "/sys/class/net/$bridge") {
 103         system("/sbin/brctl addbr $bridge") == 0 ||
 104             die "can't add bridge '$bridge'\n";
 105     }
 106 };
 107
 108 my $bridge_add_interface = sub {
 109     my ($bridge, $iface) = @_;
 110
 111     system("/sbin/brctl addif $bridge $iface") == 0 ||
 112         die "can't add interface 'iface' to bridge '$bridge'\n";
 113 };
 114
 115 my $ovs_bridge_add_port = sub {
 116     my ($bridge, $iface, $tag, $internal) = @_;
 117
 118     my $cmd = "/usr/bin/ovs-vsctl add-port $bridge $iface";
 119     $cmd .= " tag=$tag" if $tag;
 120     $cmd .= " -- set Interface $iface type=internal" if $internal;
 121     system($cmd) == 0 ||
 122         die "can't add ovs port '$iface'\n";
 123 };
 124
 125 my $activate_interface = sub {
 126     my ($iface) = @_;
 127
 128     system("/sbin/ip link set $iface up") == 0 ||
 129         die "can't activate interface '$iface'\n";
 130 };
 131
 132 sub tap_create {
 133     my ($iface, $bridge) = @_;
 134
 135     die "unable to get bridge setting\n" if !$bridge;
 136
 137     my $bridgemtu = &$read_bridge_mtu($bridge);
 138
 139     eval {
 140         PVE::Tools::run_command("/sbin/ifconfig $iface 0.0.0.0 promisc up mtu $bridgemtu");
 141     };
 142     die "interface activation failed\n" if $@;
 143 }
 144
 145 sub veth_create {
 146     my ($veth, $vethpeer, $bridge, $mac) = @_;
 147
 148     die "unable to get bridge setting\n" if !$bridge;
 149
 150     my $bridgemtu = &$read_bridge_mtu($bridge);
 151
 152     # create veth pair
 153     if (! -d "/sys/class/net/$veth") {
 154         my $cmd = "/sbin/ip link add name $veth type veth peer name $vethpeer mtu $bridgemtu";
 155         $cmd .= " addr $mac" if $mac;
 156         system($cmd) == 0 || die "can't create interface $veth\n";
 157     }
 158
 159     # up vethpair
 160     &$activate_interface($veth);
 161     &$activate_interface($vethpeer);
 162 }
 163
 164 sub veth_delete {
 165     my ($veth) = @_;
 166
 167     if (-d "/sys/class/net/$veth") {
 168         run_command("/sbin/ip link delete dev $veth", outfunc => sub {}, errfunc => sub {});
 169     }
 170
 171 }
 172
 173 my $create_firewall_bridge_linux = sub {
 174     my ($iface, $bridge) = @_;
 175
 176     my ($vmid, $devid) = &$parse_tap_devive_name($iface);
 177     my ($fwbr, $vethfw, $vethfwpeer) = &$compute_fwbr_names($vmid, $devid);
 178
 179     &$cond_create_bridge($fwbr);
 180     &$activate_interface($fwbr);
 181
 182     copy_bridge_config($bridge, $fwbr);
 183     veth_create($vethfw, $vethfwpeer, $bridge);
 184
 185     &$bridge_add_interface($fwbr, $vethfw);
 186     &$bridge_add_interface($bridge, $vethfwpeer);
 187
 188     return $fwbr;
 189 };
 190
 191 my $create_firewall_bridge_ovs = sub {
 192     my ($iface, $bridge, $tag) = @_;
 193
 194     my ($vmid, $devid) = &$parse_tap_devive_name($iface);
 195     my ($fwbr, undef, undef, $ovsintport) = &$compute_fwbr_names($vmid, $devid);
 196
 197     my $bridgemtu = &$read_bridge_mtu($bridge);
 198
 199     &$cond_create_bridge($fwbr);
 200     &$activate_interface($fwbr);
 201
 202     &$bridge_add_interface($fwbr, $iface);
 203
 204     &$ovs_bridge_add_port($bridge, $ovsintport, $tag, 1);
 205     &$activate_interface($ovsintport);
 206
 207     # set the same mtu for ovs int port
 208     PVE::Tools::run_command("/sbin/ifconfig $ovsintport mtu $bridgemtu");
 209
 210     &$bridge_add_interface($fwbr, $ovsintport);
 211 };
 212
 213 my $cleanup_firewall_bridge = sub {
 214     my ($iface) = @_;
 215
 216     my ($vmid, $devid) = &$parse_tap_devive_name($iface, 1);
 217     return if !defined($vmid);
 218     my ($fwbr, $vethfw, $vethfwpeer, $ovsintport) = &$compute_fwbr_names($vmid, $devid);
 219
 220     # cleanup old port config from any openvswitch bridge
 221     if (-d "/sys/class/net/$ovsintport") {
 222         run_command("/usr/bin/ovs-vsctl del-port $ovsintport", outfunc => sub {}, errfunc => sub {});
 223     }
 224
 225     # delete old vethfw interface
 226     veth_delete($vethfw);
 227
 228     # cleanup fwbr bridge
 229     if (-d "/sys/class/net/$fwbr") {
 230         run_command("/sbin/ip link set dev $fwbr down", outfunc => sub {}, errfunc => sub {});
 231         run_command("/sbin/brctl delbr $fwbr", outfunc => sub {}, errfunc => sub {});
 232     }
 233 };
 234
 235 sub tap_plug {
 236     my ($iface, $bridge, $tag, $firewall) = @_;
 237
 238     #cleanup old port config from any openvswitch bridge
 239     eval {run_command("/usr/bin/ovs-vsctl del-port $iface", outfunc => sub {}, errfunc => sub {}) };
 240
 241     if (-d "/sys/class/net/$bridge/bridge") {
 242         &$cleanup_firewall_bridge($iface); # remove stale devices
 243
 244         my $newbridge = activate_bridge_vlan($bridge, $tag);
 245         copy_bridge_config($bridge, $newbridge) if $bridge ne $newbridge;
 246
 247         $newbridge = &$create_firewall_bridge_linux($iface, $newbridge) if $firewall;
 248
 249         &$bridge_add_interface($newbridge, $iface);
 250     } else {
 251         &$cleanup_firewall_bridge($iface); # remove stale devices
 252
 253         if ($firewall) {
 254             &$create_firewall_bridge_ovs($iface, $bridge, $tag);
 255         } else {
 256             &$ovs_bridge_add_port($bridge, $iface, $tag);
 257         }
 258     }
 259 }
 260
 261 sub tap_unplug {
 262     my ($iface) = @_;
 263
 264     my $path= "/sys/class/net/$iface/brport/bridge";
 265     if (-l $path) {
 266         my $bridge = basename(readlink($path));
 267         #avoid insecure dependency;
 268         ($bridge) = $bridge =~ /(\S+)/;
 269
 270         system("/sbin/brctl delif $bridge $iface") == 0 ||
 271             die "can't del interface '$iface' from bridge '$bridge'\n";
 272
 273     }
 274
 275     &$cleanup_firewall_bridge($iface);
 276 }
 277
 278 sub copy_bridge_config {
 279     my ($br0, $br1) = @_;
 280
 281     return if $br0 eq $br1;
 282
 283     my $br_configs = [ 'ageing_time', 'stp_state', 'priority', 'forward_delay',
 284                        'hello_time', 'max_age', 'multicast_snooping', 'multicast_querier'];
 285
 286     foreach my $sysname (@$br_configs) {
 287         eval {
 288             my $v0 = PVE::Tools::file_read_firstline("/sys/class/net/$br0/bridge/$sysname");
 289             my $v1 = PVE::Tools::file_read_firstline("/sys/class/net/$br1/bridge/$sysname");
 290             if ($v0 ne $v1) {
 291                  PVE::ProcFSTools::write_proc_entry("/sys/class/net/$br1/bridge/$sysname", $v0);
 292             }
 293         };
 294         warn $@ if $@;
 295     }
 296 }
 297
 298 sub activate_bridge_vlan_slave {
 299     my ($bridgevlan, $iface, $tag) = @_;
 300     my $ifacevlan = "${iface}.$tag";
 301
 302     # create vlan on $iface is not already exist
 303     if (! -d "/sys/class/net/$ifacevlan") {
 304         system("/sbin/vconfig add $iface $tag") == 0 ||
 305             die "can't add vlan tag $tag to interface $iface\n";
 306     }
 307
 308     # be sure to have the $ifacevlan up
 309     &$activate_interface($ifacevlan);
 310
 311     # test if $vlaniface is already enslaved in another bridge
 312     my $path= "/sys/class/net/$ifacevlan/brport/bridge";
 313     if (-l $path) {
 314         my $tbridge = basename(readlink($path));
 315         if ($tbridge ne $bridgevlan) {
 316             die "interface $ifacevlan already exist in bridge $tbridge\n";
 317         } else {
 318             # Port already attached to bridge: do nothing.
 319             return;
 320         }
 321     }
 322
 323     # add $ifacevlan to the bridge
 324     &$bridge_add_interface($bridgevlan, $ifacevlan);
 325 }
 326
 327 sub activate_bridge_vlan {
 328     my ($bridge, $tag_param) = @_;
 329
 330     die "bridge '$bridge' is not active\n" if ! -d "/sys/class/net/$bridge";
 331
 332     return $bridge if !defined($tag_param); # no vlan, simply return
 333
 334     my $tag = int($tag_param);
 335
 336     die "got strange vlan tag '$tag_param'\n" if $tag < 1 || $tag > 4094;
 337
 338     my $bridgevlan = "${bridge}v$tag";
 339
 340     my @ifaces = ();
 341     my $dir = "/sys/class/net/$bridge/brif";
 342     PVE::Tools::dir_glob_foreach($dir, '((eth|bond)\d+)', sub {
 343         push @ifaces, $_[0];
 344     });
 345
 346     die "no physical interface on bridge '$bridge'\n" if scalar(@ifaces) == 0;
 347
 348     # add bridgevlan if it doesn't already exist
 349     if (! -d "/sys/class/net/$bridgevlan") {
 350         system("/sbin/brctl addbr $bridgevlan") == 0 ||
 351             die "can't add bridge $bridgevlan\n";
 352     }
 353
 354     # for each physical interface (eth or bridge) bind them to bridge vlan
 355     foreach my $iface (@ifaces) {
 356         activate_bridge_vlan_slave($bridgevlan, $iface, $tag);
 357     }
 358
 359     #fixme: set other bridge flags
 360
 361     # be sure to have the bridge up
 362     system("/sbin/ip link set $bridgevlan up") == 0 ||
 363         die "can't up bridge $bridgevlan\n";
 364
 365     return $bridgevlan;
 366 }
 367
 368 1;