package PVE::Network; use strict; use warnings; use PVE::Tools qw(run_command lock_file); use PVE::ProcFSTools; use PVE::INotify; use File::Basename; use IO::Socket::IP; use Socket qw(NI_NUMERICHOST NI_NUMERICSERV); use POSIX qw(ECONNREFUSED); use Net::IP; # host network related utility functions our $PHYSICAL_NIC_RE = qr/(?:eth\d+|en[^:.]+|ib\d+)/; our $ipv4_reverse_mask = [ '0.0.0.0', '128.0.0.0', '192.0.0.0', '224.0.0.0', '240.0.0.0', '248.0.0.0', '252.0.0.0', '254.0.0.0', '255.0.0.0', '255.128.0.0', '255.192.0.0', '255.224.0.0', '255.240.0.0', '255.248.0.0', '255.252.0.0', '255.254.0.0', '255.255.0.0', '255.255.128.0', '255.255.192.0', '255.255.224.0', '255.255.240.0', '255.255.248.0', '255.255.252.0', '255.255.254.0', '255.255.255.0', '255.255.255.128', '255.255.255.192', '255.255.255.224', '255.255.255.240', '255.255.255.248', '255.255.255.252', '255.255.255.254', '255.255.255.255', ]; our $ipv4_mask_hash_localnet = { '255.0.0.0' => 8, '255.128.0.0' => 9, '255.192.0.0' => 10, '255.224.0.0' => 11, '255.240.0.0' => 12, '255.248.0.0' => 13, '255.252.0.0' => 14, '255.254.0.0' => 15, '255.255.0.0' => 16, '255.255.128.0' => 17, '255.255.192.0' => 18, '255.255.224.0' => 19, '255.255.240.0' => 20, '255.255.248.0' => 21, '255.255.252.0' => 22, '255.255.254.0' => 23, '255.255.255.0' => 24, '255.255.255.128' => 25, '255.255.255.192' => 26, '255.255.255.224' => 27, '255.255.255.240' => 28, '255.255.255.248' => 29, '255.255.255.252' => 30, '255.255.255.254' => 31, '255.255.255.255' => 32, }; sub setup_tc_rate_limit { my ($iface, $rate, $burst, $debug) = @_; # these are allowed / expected to fail, e.g. when there is no previous rate limit to remove eval { run_command("/sbin/tc class del dev $iface parent 1: classid 1:1 >/dev/null 2>&1"); }; eval { run_command("/sbin/tc filter del dev $iface parent ffff: protocol all pref 50 u32 >/dev/null 2>&1"); }; eval { run_command("/sbin/tc qdisc del dev $iface ingress >/dev/null 2>&1"); }; eval { run_command("/sbin/tc qdisc del dev $iface root >/dev/null 2>&1"); }; return if !$rate; # tbf does not work for unknown reason #$TC qdisc add dev $DEV root tbf rate $RATE latency 100ms burst $BURST # so we use htb instead run_command("/sbin/tc qdisc add dev $iface root handle 1: htb default 1"); run_command("/sbin/tc class add dev $iface parent 1: classid 1:1 " . "htb rate ${rate}bps burst ${burst}b"); run_command("/sbin/tc qdisc add dev $iface handle ffff: ingress"); run_command("/sbin/tc filter add dev $iface parent ffff: " . "prio 50 basic " . "police rate ${rate}bps burst ${burst}b mtu 64kb " . "drop"); if ($debug) { print "DEBUG tc settings\n"; system("/sbin/tc qdisc ls dev $iface"); system("/sbin/tc class ls dev $iface"); system("/sbin/tc filter ls dev $iface parent ffff:"); } } sub tap_rate_limit { my ($iface, $rate) = @_; my $debug = 0; $rate = int($rate*1024*1024) if $rate; my $burst = 1024*1024; setup_tc_rate_limit($iface, $rate, $burst, $debug); } my $read_bridge_mtu = sub { my ($bridge) = @_; my $mtu = PVE::Tools::file_read_firstline("/sys/class/net/$bridge/mtu"); die "bridge '$bridge' does not exist\n" if !$mtu; # avoid insecure dependency; die "unable to parse mtu value" if $mtu !~ /^(\d+)$/; $mtu = int($1); return $mtu; }; my $parse_tap_device_name = sub { my ($iface, $noerr) = @_; my ($vmid, $devid); if ($iface =~ m/^tap(\d+)i(\d+)$/) { $vmid = $1; $devid = $2; } elsif ($iface =~ m/^veth(\d+)i(\d+)$/) { $vmid = $1; $devid = $2; } else { return undef if $noerr; die "can't create firewall bridge for random interface name '$iface'\n"; } return ($vmid, $devid); }; my $compute_fwbr_names = sub { my ($vmid, $devid) = @_; my $fwbr = "fwbr${vmid}i${devid}"; # Note: the firewall use 'fwln+' to filter traffic to VMs my $vethfw = "fwln${vmid}i${devid}"; my $vethfwpeer = "fwpr${vmid}p${devid}"; my $ovsintport = "fwln${vmid}o${devid}"; return ($fwbr, $vethfw, $vethfwpeer, $ovsintport); }; sub iface_delete($) { my ($iface) = @_; run_command(['/sbin/ip', 'link', 'delete', 'dev', $iface], noerr => 1) == 0 or die "failed to delete interface '$iface'\n"; } sub iface_create($$@) { my ($iface, $type, @args) = @_; run_command(['/sbin/ip', 'link', 'add', $iface, 'type', $type, @args], noerr => 1) == 0 or die "failed to create interface '$iface'\n"; } sub iface_set($@) { my ($iface, @opts) = @_; run_command(['/sbin/ip', 'link', 'set', $iface, @opts], noerr => 1) == 0 or die "failed to set interface options for '$iface' (".join(' ', @opts).")\n"; } # helper for nicer error messages: sub iface_set_master($$) { my ($iface, $master) = @_; if (defined($master)) { eval { iface_set($iface, 'master', $master) }; die "can't enslave '$iface' to '$master'\n" if $@; } else { eval { iface_set($iface, 'nomaster') }; die "can't unenslave '$iface'\n" if $@; } } my $cond_create_bridge = sub { my ($bridge) = @_; if (! -d "/sys/class/net/$bridge") { iface_create($bridge, 'bridge'); disable_ipv6($bridge); } }; sub disable_ipv6 { my ($iface) = @_; return if !-d '/proc/sys/net/ipv6'; # ipv6 might be completely disabled my $file = "/proc/sys/net/ipv6/conf/$iface/disable_ipv6"; open(my $fh, '>', $file) or die "failed to open $file for writing: $!\n"; print {$fh} "1\n" or die "failed to disable link-local ipv6 for $iface\n"; close($fh); } my $bridge_add_interface = sub { my ($bridge, $iface, $tag, $trunks) = @_; # drop link local address (it can't be used when on a bridge anyway) disable_ipv6($iface); iface_set_master($iface, $bridge); my $vlan_aware = PVE::Tools::file_read_firstline("/sys/class/net/$bridge/bridge/vlan_filtering"); if ($vlan_aware) { if ($tag) { system({'/sbin/bridge'} 'bridge', 'vlan', 'del', 'dev', $iface, 'vid', '1-4094') == 0 or die "failed to remove default vlan tags of $iface\n"; system({'/sbin/bridge'} 'bridge', 'vlan', 'add', 'dev', $iface, 'vid', $tag, 'pvid', 'untagged') == 0 or die "unable to add vlan $tag to interface $iface\n"; warn "Caution: Setting VLAN ID 1 on a VLAN aware bridge may be dangerous\n" if $tag == 1; } else { system("/sbin/bridge vlan add dev $iface vid 2-4094") == 0 || die "unable to add default vlan tags to interface $iface\n" if !$trunks; } if ($trunks) { my @trunks_array = split /;/, $trunks; foreach my $trunk (@trunks_array) { system("/sbin/bridge vlan add dev $iface vid $trunk") == 0 || die "unable to add vlan $trunk to interface $iface\n"; } } } }; my $ovs_bridge_add_port = sub { my ($bridge, $iface, $tag, $internal, $trunks) = @_; $trunks =~ s/;/,/g if $trunks; my $cmd = "/usr/bin/ovs-vsctl add-port $bridge $iface"; $cmd .= " tag=$tag" if $tag; $cmd .= " trunks=". join(',', $trunks) if $trunks; $cmd .= " vlan_mode=native-untagged" if $tag && $trunks; $cmd .= " -- set Interface $iface type=internal" if $internal; system($cmd) == 0 || die "can't add ovs port '$iface'\n"; disable_ipv6($iface); }; my $activate_interface = sub { my ($iface) = @_; system("/sbin/ip link set $iface up") == 0 || die "can't activate interface '$iface'\n"; }; sub tap_create { my ($iface, $bridge) = @_; die "unable to get bridge setting\n" if !$bridge; my $bridgemtu = &$read_bridge_mtu($bridge); eval { disable_ipv6($iface); PVE::Tools::run_command(['/sbin/ip', 'link', 'set', $iface, 'up', 'promisc', 'on', 'mtu', $bridgemtu]); }; die "interface activation failed\n" if $@; } sub veth_create { my ($veth, $vethpeer, $bridge, $mac) = @_; die "unable to get bridge setting\n" if !$bridge; my $bridgemtu = &$read_bridge_mtu($bridge); # create veth pair if (! -d "/sys/class/net/$veth") { my $cmd = "/sbin/ip link add name $veth type veth peer name $vethpeer mtu $bridgemtu"; $cmd .= " addr $mac" if $mac; system($cmd) == 0 || die "can't create interface $veth\n"; } # up vethpair disable_ipv6($veth); disable_ipv6($vethpeer); &$activate_interface($veth); &$activate_interface($vethpeer); } sub veth_delete { my ($veth) = @_; if (-d "/sys/class/net/$veth") { iface_delete($veth); } eval { tap_unplug($veth) }; } my $create_firewall_bridge_linux = sub { my ($iface, $bridge, $tag, $trunks) = @_; my ($vmid, $devid) = &$parse_tap_device_name($iface); my ($fwbr, $vethfw, $vethfwpeer) = &$compute_fwbr_names($vmid, $devid); &$cond_create_bridge($fwbr); &$activate_interface($fwbr); copy_bridge_config($bridge, $fwbr); veth_create($vethfw, $vethfwpeer, $bridge); &$bridge_add_interface($fwbr, $vethfw); &$bridge_add_interface($bridge, $vethfwpeer, $tag, $trunks); &$bridge_add_interface($fwbr, $iface); }; my $create_firewall_bridge_ovs = sub { my ($iface, $bridge, $tag, $trunks) = @_; my ($vmid, $devid) = &$parse_tap_device_name($iface); my ($fwbr, undef, undef, $ovsintport) = &$compute_fwbr_names($vmid, $devid); my $bridgemtu = &$read_bridge_mtu($bridge); &$cond_create_bridge($fwbr); &$activate_interface($fwbr); &$bridge_add_interface($fwbr, $iface); &$ovs_bridge_add_port($bridge, $ovsintport, $tag, 1, $trunks); &$activate_interface($ovsintport); # set the same mtu for ovs int port PVE::Tools::run_command(['/sbin/ip', 'link', 'set', $ovsintport, 'mtu', $bridgemtu]); &$bridge_add_interface($fwbr, $ovsintport); }; my $cleanup_firewall_bridge = sub { my ($iface) = @_; my ($vmid, $devid) = &$parse_tap_device_name($iface, 1); return if !defined($vmid); my ($fwbr, $vethfw, $vethfwpeer, $ovsintport) = &$compute_fwbr_names($vmid, $devid); # cleanup old port config from any openvswitch bridge if (-d "/sys/class/net/$ovsintport") { run_command("/usr/bin/ovs-vsctl del-port $ovsintport", outfunc => sub {}, errfunc => sub {}); } # delete old vethfw interface veth_delete($vethfw); # cleanup fwbr bridge if (-d "/sys/class/net/$fwbr") { iface_delete($fwbr); } }; sub tap_plug { my ($iface, $bridge, $tag, $firewall, $trunks, $rate) = @_; #cleanup old port config from any openvswitch bridge eval {run_command("/usr/bin/ovs-vsctl del-port $iface", outfunc => sub {}, errfunc => sub {}) }; if (-d "/sys/class/net/$bridge/bridge") { &$cleanup_firewall_bridge($iface); # remove stale devices my $vlan_aware = PVE::Tools::file_read_firstline("/sys/class/net/$bridge/bridge/vlan_filtering"); if (!$vlan_aware) { die "vlan aware feature need to be enabled to use trunks" if $trunks; my $newbridge = activate_bridge_vlan($bridge, $tag); copy_bridge_config($bridge, $newbridge) if $bridge ne $newbridge; $bridge = $newbridge; $tag = undef; } if ($firewall) { &$create_firewall_bridge_linux($iface, $bridge, $tag, $trunks); } else { &$bridge_add_interface($bridge, $iface, $tag, $trunks); } } else { &$cleanup_firewall_bridge($iface); # remove stale devices if ($firewall) { &$create_firewall_bridge_ovs($iface, $bridge, $tag, $trunks); } else { &$ovs_bridge_add_port($bridge, $iface, $tag, undef, $trunks); } } tap_rate_limit($iface, $rate); } sub tap_unplug { my ($iface) = @_; my $path= "/sys/class/net/$iface/brport/bridge"; if (-l $path) { my $bridge = basename(readlink($path)); #avoid insecure dependency; ($bridge) = $bridge =~ /(\S+)/; iface_set_master($iface, undef); } &$cleanup_firewall_bridge($iface); #cleanup old port config from any openvswitch bridge eval {run_command("/usr/bin/ovs-vsctl del-port $iface", outfunc => sub {}, errfunc => sub {}) }; } sub copy_bridge_config { my ($br0, $br1) = @_; return if $br0 eq $br1; my $br_configs = [ 'ageing_time', 'stp_state', 'priority', 'forward_delay', 'hello_time', 'max_age', 'multicast_snooping', 'multicast_querier']; foreach my $sysname (@$br_configs) { eval { my $v0 = PVE::Tools::file_read_firstline("/sys/class/net/$br0/bridge/$sysname"); my $v1 = PVE::Tools::file_read_firstline("/sys/class/net/$br1/bridge/$sysname"); if ($v0 ne $v1) { PVE::ProcFSTools::write_proc_entry("/sys/class/net/$br1/bridge/$sysname", $v0); } }; warn $@ if $@; } } sub activate_bridge_vlan_slave { my ($bridgevlan, $iface, $tag) = @_; my $ifacevlan = "${iface}.$tag"; # create vlan on $iface is not already exist if (! -d "/sys/class/net/$ifacevlan") { system("/sbin/ip link add link $iface name $ifacevlan type vlan id $tag") == 0 || die "can't add vlan tag $tag to interface $iface\n"; # remove ipv6 link-local address before activation disable_ipv6($ifacevlan); } # be sure to have the $ifacevlan up &$activate_interface($ifacevlan); # test if $vlaniface is already enslaved in another bridge my $path= "/sys/class/net/$ifacevlan/brport/bridge"; if (-l $path) { my $tbridge = basename(readlink($path)); if ($tbridge ne $bridgevlan) { die "interface $ifacevlan already exist in bridge $tbridge\n"; } else { # Port already attached to bridge: do nothing. return; } } # add $ifacevlan to the bridge &$bridge_add_interface($bridgevlan, $ifacevlan); } sub activate_bridge_vlan { my ($bridge, $tag_param) = @_; die "bridge '$bridge' is not active\n" if ! -d "/sys/class/net/$bridge"; return $bridge if !defined($tag_param); # no vlan, simply return my $tag = int($tag_param); die "got strange vlan tag '$tag_param'\n" if $tag < 1 || $tag > 4094; my $bridgevlan = "${bridge}v$tag"; my @ifaces = (); my $dir = "/sys/class/net/$bridge/brif"; PVE::Tools::dir_glob_foreach($dir, '(((eth|bond)\d+|en[^.]+)(\.\d+)?)', sub { push @ifaces, $_[0]; }); die "no physical interface on bridge '$bridge'\n" if scalar(@ifaces) == 0; lock_network(sub { # add bridgevlan if it doesn't already exist if (! -d "/sys/class/net/$bridgevlan") { iface_create($bridgevlan, 'bridge'); } # for each physical interface (eth or bridge) bind them to bridge vlan foreach my $iface (@ifaces) { activate_bridge_vlan_slave($bridgevlan, $iface, $tag); } #fixme: set other bridge flags # remove ipv6 link-local address before activation disable_ipv6($bridgevlan); # be sure to have the bridge up &$activate_interface($bridgevlan); }); return $bridgevlan; } sub tcp_ping { my ($host, $port, $timeout) = @_; my $refused = 1; $timeout = 3 if !$timeout; # sane default if (!$port) { # Net::Ping defaults to the echo port $port = 7; } else { # Net::Ping's port_number() implies service_check(1) $refused = 0; } my ($sock, $result); eval { $result = PVE::Tools::run_with_timeout($timeout, sub { $sock = IO::Socket::IP->new(PeerHost => $host, PeerPort => $port, Type => SOCK_STREAM); $result = $refused if $! == ECONNREFUSED; }); }; if ($sock) { $sock->close(); $result = 1; } return $result; } sub IP_from_cidr { my ($cidr, $version) = @_; return if $cidr !~ m!^(\S+?)/(\S+)$!; my ($ip, $prefix) = ($1, $2); my $ipobj = Net::IP->new($ip, $version); return if !$ipobj; $version = $ipobj->version(); my $binmask = Net::IP::ip_get_mask($prefix, $version); return if !$binmask; my $masked_binip = $ipobj->binip() & $binmask; my $masked_ip = Net::IP::ip_bintoip($masked_binip, $version); return Net::IP->new("$masked_ip/$prefix"); } sub is_ip_in_cidr { my ($ip, $cidr, $version) = @_; my $cidr_obj = IP_from_cidr($cidr, $version); return undef if !$cidr_obj; my $ip_obj = Net::IP->new($ip, $version); return undef if !$ip_obj; return $cidr_obj->overlaps($ip_obj) == $Net::IP::IP_B_IN_A_OVERLAP; } sub get_local_ip_from_cidr { my ($cidr) = @_; my $cmd = ['/sbin/ip', 'address', 'show', 'to', $cidr, 'up']; my $IPs = []; my $code = sub { my $line = shift; if ($line =~ m!^\s*inet(?:6)?\s+($PVE::Tools::IPRE)/\d+!) { push @$IPs, $1; } }; PVE::Tools::run_command($cmd, outfunc => $code); return $IPs; } sub addr_to_ip { my ($addr) = @_; my ($err, $host, $port) = Socket::getnameinfo($addr, NI_NUMERICHOST | NI_NUMERICSERV); die "failed to get numerical host address: $err\n" if $err; return ($host, $port) if wantarray; return $host; } sub get_ip_from_hostname { my ($hostname, $noerr) = @_; my ($family, $ip); eval { my @res = PVE::Tools::getaddrinfo_all($hostname); $family = $res[0]->{family}; $ip = addr_to_ip($res[0]->{addr}) }; if ($@) { die "hostname lookup '$hostname' failed - $@" if !$noerr; return undef; } if ($ip =~ m/^127\.|^::1$/) { die "hostname lookup '$hostname' failed - got local IP address '$ip'\n" if !$noerr; return undef; } return wantarray ? ($ip, $family) : $ip; } sub lock_network { my ($code, @param) = @_; my $res = lock_file('/var/lock/pve-network.lck', 10, $code, @param); die $@ if $@; return $res; } 1;