2013-07-24 12:22:54 +00:00
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/*
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* bridge_driver_linux.c: Linux implementation of bridge driver
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*
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* Copyright (C) 2006-2013 Red Hat, Inc.
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* Copyright (C) 2006 Daniel P. Berrange
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Author: Daniel P. Berrange <berrange@redhat.com>
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*/
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#include <config.h>
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#include "viralloc.h"
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#include "virfile.h"
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#include "viriptables.h"
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#include "virstring.h"
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#define VIR_FROM_THIS VIR_FROM_NONE
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#define PROC_NET_ROUTE "/proc/net/route"
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/* XXX: This function can be a lot more exhaustive, there are certainly
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* other scenarios where we can ruin host network connectivity.
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* XXX: Using a proper library is preferred over parsing /proc
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*/
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int networkCheckRouteCollision(virNetworkObjPtr network)
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{
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int ret = 0, len;
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char *cur, *buf = NULL;
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/* allow for up to 100000 routes (each line is 128 bytes) */
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enum {MAX_ROUTE_SIZE = 128*100000};
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/* Read whole routing table into memory */
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if ((len = virFileReadAll(PROC_NET_ROUTE, MAX_ROUTE_SIZE, &buf)) < 0)
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goto out;
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/* Dropping the last character shouldn't hurt */
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if (len > 0)
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buf[len-1] = '\0';
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VIR_DEBUG("%s output:\n%s", PROC_NET_ROUTE, buf);
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if (!STRPREFIX(buf, "Iface"))
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goto out;
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/* First line is just headings, skip it */
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cur = strchr(buf, '\n');
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if (cur)
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cur++;
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while (cur) {
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char iface[17], dest[128], mask[128];
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unsigned int addr_val, mask_val;
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virNetworkIpDefPtr ipdef;
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int num;
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size_t i;
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/* NUL-terminate the line, so sscanf doesn't go beyond a newline. */
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char *nl = strchr(cur, '\n');
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if (nl) {
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*nl++ = '\0';
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}
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num = sscanf(cur, "%16s %127s %*s %*s %*s %*s %*s %127s",
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iface, dest, mask);
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cur = nl;
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if (num != 3) {
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VIR_DEBUG("Failed to parse %s", PROC_NET_ROUTE);
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continue;
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}
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if (virStrToLong_ui(dest, NULL, 16, &addr_val) < 0) {
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VIR_DEBUG("Failed to convert network address %s to uint", dest);
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continue;
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}
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if (virStrToLong_ui(mask, NULL, 16, &mask_val) < 0) {
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VIR_DEBUG("Failed to convert network mask %s to uint", mask);
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continue;
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}
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addr_val &= mask_val;
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for (i = 0;
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(ipdef = virNetworkDefGetIpByIndex(network->def, AF_INET, i));
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i++) {
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unsigned int net_dest;
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virSocketAddr netmask;
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if (virNetworkIpDefNetmask(ipdef, &netmask) < 0) {
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VIR_WARN("Failed to get netmask of '%s'",
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network->def->bridge);
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continue;
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}
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net_dest = (ipdef->address.data.inet4.sin_addr.s_addr &
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netmask.data.inet4.sin_addr.s_addr);
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if ((net_dest == addr_val) &&
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(netmask.data.inet4.sin_addr.s_addr == mask_val)) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Network is already in use by interface %s"),
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iface);
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ret = -1;
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goto out;
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}
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}
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}
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out:
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VIR_FREE(buf);
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return ret;
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}
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2013-09-25 10:45:26 +00:00
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static const char networkLocalMulticast[] = "224.0.0.0/24";
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static const char networkLocalBroadcast[] = "255.255.255.255/32";
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2013-07-24 12:22:54 +00:00
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int networkAddMasqueradingFirewallRules(virNetworkObjPtr network,
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virNetworkIpDefPtr ipdef)
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{
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int prefix = virNetworkIpDefPrefix(ipdef);
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const char *forwardIf = virNetworkDefForwardIf(network->def, 0);
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if (prefix < 0) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Invalid prefix or netmask for '%s'"),
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network->def->bridge);
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goto masqerr1;
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}
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/* allow forwarding packets from the bridge interface */
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if (iptablesAddForwardAllowOut(&ipdef->address,
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prefix,
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network->def->bridge,
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forwardIf) < 0) {
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virReportError(VIR_ERR_SYSTEM_ERROR,
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_("failed to add iptables rule to allow forwarding from '%s'"),
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network->def->bridge);
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goto masqerr1;
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}
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/* allow forwarding packets to the bridge interface if they are
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* part of an existing connection
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*/
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if (iptablesAddForwardAllowRelatedIn(&ipdef->address,
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prefix,
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network->def->bridge,
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forwardIf) < 0) {
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virReportError(VIR_ERR_SYSTEM_ERROR,
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_("failed to add iptables rule to allow forwarding to '%s'"),
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network->def->bridge);
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goto masqerr2;
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}
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/*
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* Enable masquerading.
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*
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2013-09-25 10:45:26 +00:00
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* We need to end up with 5 rules in the table in this order
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*
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* 1. do not masquerade packets targeting 224.0.0.0/24
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* 2. do not masquerade packets targeting 255.255.255.255/32
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* 3. masquerade protocol=tcp with sport mapping restriction
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* 4. masquerade protocol=udp with sport mapping restriction
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* 5. generic, masquerade any protocol
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2013-07-24 12:22:54 +00:00
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*
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2013-09-25 10:45:26 +00:00
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* 224.0.0.0/24 is the local network multicast range. Packets are not
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* forwarded outside.
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*
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* 255.255.255.255/32 is the broadcast address of any local network. Again,
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* such packets are never forwarded, but strict DHCP clients don't accept
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* DHCP replies with changed source ports.
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2013-07-24 12:22:54 +00:00
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*
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* The sport mappings are required, because default IPtables
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* MASQUERADE maintain port numbers unchanged where possible.
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*
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* NFS can be configured to only "trust" port numbers < 1023.
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*
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* Guests using NAT thus need to be prevented from having port
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* numbers < 1023, otherwise they can bypass the NFS "security"
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* check on the source port number.
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*
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* Since we use '--insert' to add rules to the header of the
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* chain, we actually need to add them in the reverse of the
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* order just mentioned !
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*/
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/* First the generic masquerade rule for other protocols */
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if (iptablesAddForwardMasquerade(&ipdef->address,
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prefix,
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forwardIf,
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&network->def->forward.addr,
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&network->def->forward.port,
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NULL) < 0) {
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if (forwardIf)
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virReportError(VIR_ERR_SYSTEM_ERROR,
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_("failed to add iptables rule to enable masquerading to %s"),
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forwardIf);
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else
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virReportError(VIR_ERR_SYSTEM_ERROR, "%s",
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_("failed to add iptables rule to enable masquerading"));
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goto masqerr3;
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}
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/* UDP with a source port restriction */
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if (iptablesAddForwardMasquerade(&ipdef->address,
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prefix,
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forwardIf,
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&network->def->forward.addr,
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&network->def->forward.port,
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"udp") < 0) {
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if (forwardIf)
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virReportError(VIR_ERR_SYSTEM_ERROR,
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_("failed to add iptables rule to enable UDP masquerading to %s"),
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forwardIf);
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else
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virReportError(VIR_ERR_SYSTEM_ERROR, "%s",
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_("failed to add iptables rule to enable UDP masquerading"));
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goto masqerr4;
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}
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/* TCP with a source port restriction */
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if (iptablesAddForwardMasquerade(&ipdef->address,
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prefix,
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forwardIf,
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&network->def->forward.addr,
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&network->def->forward.port,
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"tcp") < 0) {
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if (forwardIf)
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virReportError(VIR_ERR_SYSTEM_ERROR,
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_("failed to add iptables rule to enable TCP masquerading to %s"),
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forwardIf);
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else
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virReportError(VIR_ERR_SYSTEM_ERROR, "%s",
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_("failed to add iptables rule to enable TCP masquerading"));
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goto masqerr5;
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}
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2013-09-25 10:45:26 +00:00
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/* exempt local network broadcast address as destination */
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if (iptablesAddDontMasquerade(&ipdef->address,
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prefix,
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forwardIf,
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networkLocalBroadcast) < 0) {
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if (forwardIf)
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virReportError(VIR_ERR_SYSTEM_ERROR,
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_("failed to add iptables rule to prevent local broadcast masquerading on %s"),
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forwardIf);
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else
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virReportError(VIR_ERR_SYSTEM_ERROR, "%s",
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_("failed to add iptables rule to prevent local broadcast masquerading"));
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goto masqerr6;
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}
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/* exempt local multicast range as destination */
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if (iptablesAddDontMasquerade(&ipdef->address,
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prefix,
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forwardIf,
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networkLocalMulticast) < 0) {
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if (forwardIf)
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virReportError(VIR_ERR_SYSTEM_ERROR,
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_("failed to add iptables rule to prevent local multicast masquerading on %s"),
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forwardIf);
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else
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virReportError(VIR_ERR_SYSTEM_ERROR, "%s",
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_("failed to add iptables rule to prevent local multicast masquerading"));
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goto masqerr7;
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}
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2013-07-24 12:22:54 +00:00
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return 0;
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2013-09-25 10:45:26 +00:00
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masqerr7:
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iptablesRemoveDontMasquerade(&ipdef->address,
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prefix,
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forwardIf,
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networkLocalBroadcast);
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masqerr6:
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iptablesRemoveForwardMasquerade(&ipdef->address,
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prefix,
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forwardIf,
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&network->def->forward.addr,
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&network->def->forward.port,
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"tcp");
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2013-07-24 12:22:54 +00:00
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masqerr5:
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iptablesRemoveForwardMasquerade(&ipdef->address,
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prefix,
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forwardIf,
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&network->def->forward.addr,
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&network->def->forward.port,
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"udp");
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masqerr4:
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iptablesRemoveForwardMasquerade(&ipdef->address,
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prefix,
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forwardIf,
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&network->def->forward.addr,
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&network->def->forward.port,
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NULL);
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masqerr3:
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iptablesRemoveForwardAllowRelatedIn(&ipdef->address,
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prefix,
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network->def->bridge,
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forwardIf);
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masqerr2:
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iptablesRemoveForwardAllowOut(&ipdef->address,
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prefix,
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network->def->bridge,
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forwardIf);
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masqerr1:
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return -1;
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}
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void networkRemoveMasqueradingFirewallRules(virNetworkObjPtr network,
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virNetworkIpDefPtr ipdef)
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{
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int prefix = virNetworkIpDefPrefix(ipdef);
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const char *forwardIf = virNetworkDefForwardIf(network->def, 0);
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if (prefix >= 0) {
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2013-09-25 10:45:26 +00:00
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iptablesRemoveDontMasquerade(&ipdef->address,
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prefix,
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forwardIf,
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networkLocalMulticast);
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iptablesRemoveDontMasquerade(&ipdef->address,
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prefix,
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forwardIf,
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networkLocalBroadcast);
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2013-07-24 12:22:54 +00:00
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iptablesRemoveForwardMasquerade(&ipdef->address,
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prefix,
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forwardIf,
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&network->def->forward.addr,
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&network->def->forward.port,
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"tcp");
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iptablesRemoveForwardMasquerade(&ipdef->address,
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prefix,
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forwardIf,
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&network->def->forward.addr,
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&network->def->forward.port,
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"udp");
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iptablesRemoveForwardMasquerade(&ipdef->address,
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prefix,
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forwardIf,
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&network->def->forward.addr,
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&network->def->forward.port,
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NULL);
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iptablesRemoveForwardAllowRelatedIn(&ipdef->address,
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prefix,
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network->def->bridge,
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forwardIf);
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iptablesRemoveForwardAllowOut(&ipdef->address,
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prefix,
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network->def->bridge,
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forwardIf);
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}
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}
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int networkAddRoutingFirewallRules(virNetworkObjPtr network,
|
|
|
|
virNetworkIpDefPtr ipdef)
|
|
|
|
{
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int prefix = virNetworkIpDefPrefix(ipdef);
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|
const char *forwardIf = virNetworkDefForwardIf(network->def, 0);
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|
if (prefix < 0) {
|
|
|
|
virReportError(VIR_ERR_INTERNAL_ERROR,
|
|
|
|
_("Invalid prefix or netmask for '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto routeerr1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* allow routing packets from the bridge interface */
|
|
|
|
if (iptablesAddForwardAllowOut(&ipdef->address,
|
|
|
|
prefix,
|
|
|
|
network->def->bridge,
|
|
|
|
forwardIf) < 0) {
|
|
|
|
virReportError(VIR_ERR_SYSTEM_ERROR,
|
|
|
|
_("failed to add iptables rule to allow routing from '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto routeerr1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* allow routing packets to the bridge interface */
|
|
|
|
if (iptablesAddForwardAllowIn(&ipdef->address,
|
|
|
|
prefix,
|
|
|
|
network->def->bridge,
|
|
|
|
forwardIf) < 0) {
|
|
|
|
virReportError(VIR_ERR_SYSTEM_ERROR,
|
|
|
|
_("failed to add iptables rule to allow routing to '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto routeerr2;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
routeerr2:
|
|
|
|
iptablesRemoveForwardAllowOut(&ipdef->address,
|
|
|
|
prefix,
|
|
|
|
network->def->bridge,
|
|
|
|
forwardIf);
|
|
|
|
routeerr1:
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
void networkRemoveRoutingFirewallRules(virNetworkObjPtr network,
|
|
|
|
virNetworkIpDefPtr ipdef)
|
|
|
|
{
|
|
|
|
int prefix = virNetworkIpDefPrefix(ipdef);
|
|
|
|
const char *forwardIf = virNetworkDefForwardIf(network->def, 0);
|
|
|
|
|
|
|
|
if (prefix >= 0) {
|
|
|
|
iptablesRemoveForwardAllowIn(&ipdef->address,
|
|
|
|
prefix,
|
|
|
|
network->def->bridge,
|
|
|
|
forwardIf);
|
|
|
|
|
|
|
|
iptablesRemoveForwardAllowOut(&ipdef->address,
|
|
|
|
prefix,
|
|
|
|
network->def->bridge,
|
|
|
|
forwardIf);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Add all once/network rules required for IPv6.
|
|
|
|
* If no IPv6 addresses are defined and <network ipv6='yes'> is
|
|
|
|
* specified, then allow IPv6 commuinications between virtual systems.
|
|
|
|
* If any IPv6 addresses are defined, then add the rules for regular operation.
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
networkAddGeneralIp6tablesRules(virNetworkObjPtr network)
|
|
|
|
{
|
|
|
|
|
|
|
|
if (!virNetworkDefGetIpByIndex(network->def, AF_INET6, 0) &&
|
|
|
|
!network->def->ipv6nogw) {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Catch all rules to block forwarding to/from bridges */
|
|
|
|
|
|
|
|
if (iptablesAddForwardRejectOut(AF_INET6, network->def->bridge) < 0) {
|
|
|
|
virReportError(VIR_ERR_SYSTEM_ERROR,
|
|
|
|
_("failed to add ip6tables rule to block outbound traffic from '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto err1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (iptablesAddForwardRejectIn(AF_INET6, network->def->bridge) < 0) {
|
|
|
|
virReportError(VIR_ERR_SYSTEM_ERROR,
|
|
|
|
_("failed to add ip6tables rule to block inbound traffic to '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto err2;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Allow traffic between guests on the same bridge */
|
|
|
|
if (iptablesAddForwardAllowCross(AF_INET6, network->def->bridge) < 0) {
|
|
|
|
virReportError(VIR_ERR_SYSTEM_ERROR,
|
|
|
|
_("failed to add ip6tables rule to allow cross bridge traffic on '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto err3;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* if no IPv6 addresses are defined, we are done. */
|
|
|
|
if (!virNetworkDefGetIpByIndex(network->def, AF_INET6, 0))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
/* allow DNS over IPv6 */
|
|
|
|
if (iptablesAddTcpInput(AF_INET6, network->def->bridge, 53) < 0) {
|
|
|
|
virReportError(VIR_ERR_SYSTEM_ERROR,
|
|
|
|
_("failed to add ip6tables rule to allow DNS requests from '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto err4;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (iptablesAddUdpInput(AF_INET6, network->def->bridge, 53) < 0) {
|
|
|
|
virReportError(VIR_ERR_SYSTEM_ERROR,
|
|
|
|
_("failed to add ip6tables rule to allow DNS requests from '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto err5;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (iptablesAddUdpInput(AF_INET6, network->def->bridge, 547) < 0) {
|
|
|
|
virReportError(VIR_ERR_SYSTEM_ERROR,
|
|
|
|
_("failed to add ip6tables rule to allow DHCP6 requests from '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto err6;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
/* unwind in reverse order from the point of failure */
|
|
|
|
err6:
|
|
|
|
iptablesRemoveUdpInput(AF_INET6, network->def->bridge, 53);
|
|
|
|
err5:
|
|
|
|
iptablesRemoveTcpInput(AF_INET6, network->def->bridge, 53);
|
|
|
|
err4:
|
|
|
|
iptablesRemoveForwardAllowCross(AF_INET6, network->def->bridge);
|
|
|
|
err3:
|
|
|
|
iptablesRemoveForwardRejectIn(AF_INET6, network->def->bridge);
|
|
|
|
err2:
|
|
|
|
iptablesRemoveForwardRejectOut(AF_INET6, network->def->bridge);
|
|
|
|
err1:
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
networkRemoveGeneralIp6tablesRules(virNetworkObjPtr network)
|
|
|
|
{
|
|
|
|
if (!virNetworkDefGetIpByIndex(network->def, AF_INET6, 0) &&
|
|
|
|
!network->def->ipv6nogw) {
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (virNetworkDefGetIpByIndex(network->def, AF_INET6, 0)) {
|
|
|
|
iptablesRemoveUdpInput(AF_INET6, network->def->bridge, 547);
|
|
|
|
iptablesRemoveUdpInput(AF_INET6, network->def->bridge, 53);
|
|
|
|
iptablesRemoveTcpInput(AF_INET6, network->def->bridge, 53);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* the following rules are there if no IPv6 address has been defined
|
|
|
|
* but network->def->ipv6nogw == true
|
|
|
|
*/
|
|
|
|
iptablesRemoveForwardAllowCross(AF_INET6, network->def->bridge);
|
|
|
|
iptablesRemoveForwardRejectIn(AF_INET6, network->def->bridge);
|
|
|
|
iptablesRemoveForwardRejectOut(AF_INET6, network->def->bridge);
|
|
|
|
}
|
|
|
|
|
|
|
|
int networkAddGeneralFirewallRules(virNetworkObjPtr network)
|
|
|
|
{
|
|
|
|
size_t i;
|
|
|
|
virNetworkIpDefPtr ipv4def;
|
|
|
|
|
|
|
|
/* First look for first IPv4 address that has dhcp or tftpboot defined. */
|
|
|
|
/* We support dhcp config on 1 IPv4 interface only. */
|
|
|
|
for (i = 0;
|
|
|
|
(ipv4def = virNetworkDefGetIpByIndex(network->def, AF_INET, i));
|
|
|
|
i++) {
|
|
|
|
if (ipv4def->nranges || ipv4def->nhosts || ipv4def->tftproot)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* allow DHCP requests through to dnsmasq */
|
|
|
|
|
|
|
|
if (iptablesAddTcpInput(AF_INET, network->def->bridge, 67) < 0) {
|
|
|
|
virReportError(VIR_ERR_SYSTEM_ERROR,
|
|
|
|
_("failed to add iptables rule to allow DHCP requests from '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto err1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (iptablesAddUdpInput(AF_INET, network->def->bridge, 67) < 0) {
|
|
|
|
virReportError(VIR_ERR_SYSTEM_ERROR,
|
|
|
|
_("failed to add iptables rule to allow DHCP requests from '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto err2;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* If we are doing local DHCP service on this network, attempt to
|
|
|
|
* add a rule that will fixup the checksum of DHCP response
|
|
|
|
* packets back to the guests (but report failure without
|
|
|
|
* aborting, since not all iptables implementations support it).
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (ipv4def && (ipv4def->nranges || ipv4def->nhosts) &&
|
|
|
|
(iptablesAddOutputFixUdpChecksum(network->def->bridge, 68) < 0)) {
|
|
|
|
VIR_WARN("Could not add rule to fixup DHCP response checksums "
|
|
|
|
"on network '%s'.", network->def->name);
|
|
|
|
VIR_WARN("May need to update iptables package & kernel to support CHECKSUM rule.");
|
|
|
|
}
|
|
|
|
|
|
|
|
/* allow DNS requests through to dnsmasq */
|
|
|
|
if (iptablesAddTcpInput(AF_INET, network->def->bridge, 53) < 0) {
|
|
|
|
virReportError(VIR_ERR_SYSTEM_ERROR,
|
|
|
|
_("failed to add iptables rule to allow DNS requests from '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto err3;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (iptablesAddUdpInput(AF_INET, network->def->bridge, 53) < 0) {
|
|
|
|
virReportError(VIR_ERR_SYSTEM_ERROR,
|
|
|
|
_("failed to add iptables rule to allow DNS requests from '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto err4;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* allow TFTP requests through to dnsmasq if necessary */
|
|
|
|
if (ipv4def && ipv4def->tftproot &&
|
|
|
|
iptablesAddUdpInput(AF_INET, network->def->bridge, 69) < 0) {
|
|
|
|
virReportError(VIR_ERR_SYSTEM_ERROR,
|
|
|
|
_("failed to add iptables rule to allow TFTP requests from '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto err5;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Catch all rules to block forwarding to/from bridges */
|
|
|
|
|
|
|
|
if (iptablesAddForwardRejectOut(AF_INET, network->def->bridge) < 0) {
|
|
|
|
virReportError(VIR_ERR_SYSTEM_ERROR,
|
|
|
|
_("failed to add iptables rule to block outbound traffic from '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto err6;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (iptablesAddForwardRejectIn(AF_INET, network->def->bridge) < 0) {
|
|
|
|
virReportError(VIR_ERR_SYSTEM_ERROR,
|
|
|
|
_("failed to add iptables rule to block inbound traffic to '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto err7;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Allow traffic between guests on the same bridge */
|
|
|
|
if (iptablesAddForwardAllowCross(AF_INET, network->def->bridge) < 0) {
|
|
|
|
virReportError(VIR_ERR_SYSTEM_ERROR,
|
|
|
|
_("failed to add iptables rule to allow cross bridge traffic on '%s'"),
|
|
|
|
network->def->bridge);
|
|
|
|
goto err8;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* add IPv6 general rules, if needed */
|
|
|
|
if (networkAddGeneralIp6tablesRules(network) < 0) {
|
|
|
|
goto err9;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
/* unwind in reverse order from the point of failure */
|
|
|
|
err9:
|
|
|
|
iptablesRemoveForwardAllowCross(AF_INET, network->def->bridge);
|
|
|
|
err8:
|
|
|
|
iptablesRemoveForwardRejectIn(AF_INET, network->def->bridge);
|
|
|
|
err7:
|
|
|
|
iptablesRemoveForwardRejectOut(AF_INET, network->def->bridge);
|
|
|
|
err6:
|
|
|
|
if (ipv4def && ipv4def->tftproot) {
|
|
|
|
iptablesRemoveUdpInput(AF_INET, network->def->bridge, 69);
|
|
|
|
}
|
|
|
|
err5:
|
|
|
|
iptablesRemoveUdpInput(AF_INET, network->def->bridge, 53);
|
|
|
|
err4:
|
|
|
|
iptablesRemoveTcpInput(AF_INET, network->def->bridge, 53);
|
|
|
|
err3:
|
|
|
|
iptablesRemoveUdpInput(AF_INET, network->def->bridge, 67);
|
|
|
|
err2:
|
|
|
|
iptablesRemoveTcpInput(AF_INET, network->def->bridge, 67);
|
|
|
|
err1:
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
void networkRemoveGeneralFirewallRules(virNetworkObjPtr network)
|
|
|
|
{
|
|
|
|
size_t i;
|
|
|
|
virNetworkIpDefPtr ipv4def;
|
|
|
|
|
|
|
|
networkRemoveGeneralIp6tablesRules(network);
|
|
|
|
|
|
|
|
for (i = 0;
|
|
|
|
(ipv4def = virNetworkDefGetIpByIndex(network->def, AF_INET, i));
|
|
|
|
i++) {
|
|
|
|
if (ipv4def->nranges || ipv4def->nhosts || ipv4def->tftproot)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
iptablesRemoveForwardAllowCross(AF_INET, network->def->bridge);
|
|
|
|
iptablesRemoveForwardRejectIn(AF_INET, network->def->bridge);
|
|
|
|
iptablesRemoveForwardRejectOut(AF_INET, network->def->bridge);
|
|
|
|
if (ipv4def && ipv4def->tftproot) {
|
|
|
|
iptablesRemoveUdpInput(AF_INET, network->def->bridge, 69);
|
|
|
|
}
|
|
|
|
iptablesRemoveUdpInput(AF_INET, network->def->bridge, 53);
|
|
|
|
iptablesRemoveTcpInput(AF_INET, network->def->bridge, 53);
|
|
|
|
if (ipv4def && (ipv4def->nranges || ipv4def->nhosts)) {
|
|
|
|
iptablesRemoveOutputFixUdpChecksum(network->def->bridge, 68);
|
|
|
|
}
|
|
|
|
iptablesRemoveUdpInput(AF_INET, network->def->bridge, 67);
|
|
|
|
iptablesRemoveTcpInput(AF_INET, network->def->bridge, 67);
|
|
|
|
}
|
|
|
|
|
|
|
|
int networkAddIpSpecificFirewallRules(virNetworkObjPtr network,
|
|
|
|
virNetworkIpDefPtr ipdef)
|
|
|
|
{
|
|
|
|
/* NB: in the case of IPv6, routing rules are added when the
|
|
|
|
* forward mode is NAT. This is because IPv6 has no NAT.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (network->def->forward.type == VIR_NETWORK_FORWARD_NAT) {
|
|
|
|
if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET))
|
|
|
|
return networkAddMasqueradingFirewallRules(network, ipdef);
|
|
|
|
else if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET6))
|
|
|
|
return networkAddRoutingFirewallRules(network, ipdef);
|
|
|
|
} else if (network->def->forward.type == VIR_NETWORK_FORWARD_ROUTE) {
|
|
|
|
return networkAddRoutingFirewallRules(network, ipdef);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void networkRemoveIpSpecificFirewallRules(virNetworkObjPtr network,
|
|
|
|
virNetworkIpDefPtr ipdef)
|
|
|
|
{
|
|
|
|
if (network->def->forward.type == VIR_NETWORK_FORWARD_NAT) {
|
|
|
|
if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET))
|
|
|
|
networkRemoveMasqueradingFirewallRules(network, ipdef);
|
|
|
|
else if (VIR_SOCKET_ADDR_IS_FAMILY(&ipdef->address, AF_INET6))
|
|
|
|
networkRemoveRoutingFirewallRules(network, ipdef);
|
|
|
|
} else if (network->def->forward.type == VIR_NETWORK_FORWARD_ROUTE) {
|
|
|
|
networkRemoveRoutingFirewallRules(network, ipdef);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Add all rules for all ip addresses (and general rules) on a network */
|
|
|
|
int networkAddFirewallRules(virNetworkObjPtr network)
|
|
|
|
{
|
|
|
|
size_t i, j;
|
|
|
|
virNetworkIpDefPtr ipdef;
|
|
|
|
virErrorPtr orig_error;
|
|
|
|
|
|
|
|
/* Add "once per network" rules */
|
|
|
|
if (networkAddGeneralFirewallRules(network) < 0)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
for (i = 0;
|
|
|
|
(ipdef = virNetworkDefGetIpByIndex(network->def, AF_UNSPEC, i));
|
|
|
|
i++) {
|
|
|
|
/* Add address-specific iptables rules */
|
|
|
|
if (networkAddIpSpecificFirewallRules(network, ipdef) < 0) {
|
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
err:
|
|
|
|
/* store the previous error message before attempting removal of rules */
|
|
|
|
orig_error = virSaveLastError();
|
|
|
|
|
|
|
|
/* The final failed call to networkAddIpSpecificFirewallRules will
|
|
|
|
* have removed any rules it created, but we need to remove those
|
|
|
|
* added for previous IP addresses.
|
|
|
|
*/
|
|
|
|
for (j = 0; j < i; j++) {
|
|
|
|
if ((ipdef = virNetworkDefGetIpByIndex(network->def, AF_UNSPEC, j)))
|
|
|
|
networkRemoveIpSpecificFirewallRules(network, ipdef);
|
|
|
|
}
|
|
|
|
networkRemoveGeneralFirewallRules(network);
|
|
|
|
|
|
|
|
/* return the original error */
|
|
|
|
virSetError(orig_error);
|
|
|
|
virFreeError(orig_error);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Remove all rules for all ip addresses (and general rules) on a network */
|
|
|
|
void networkRemoveFirewallRules(virNetworkObjPtr network)
|
|
|
|
{
|
|
|
|
size_t i;
|
|
|
|
virNetworkIpDefPtr ipdef;
|
|
|
|
|
|
|
|
for (i = 0;
|
|
|
|
(ipdef = virNetworkDefGetIpByIndex(network->def, AF_UNSPEC, i));
|
|
|
|
i++) {
|
|
|
|
networkRemoveIpSpecificFirewallRules(network, ipdef);
|
|
|
|
}
|
|
|
|
networkRemoveGeneralFirewallRules(network);
|
|
|
|
}
|