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libvirt/src/nwfilter/nwfilter_ebiptables_driver.c
Jiri Denemark 04df8f474b nwfilter: Update format strings in translated messages 
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
2023-04-01 11:40:33 +02:00

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/*
* nwfilter_ebiptables_driver.c: driver for ebtables/iptables on tap devices
*
* Copyright (C) 2011-2014 Red Hat, Inc.
* Copyright (C) 2010-2012 IBM Corp.
* Copyright (C) 2010-2012 Stefan Berger
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/utsname.h>
#include "internal.h"
#include "virbuffer.h"
#include "viralloc.h"
#include "virlog.h"
#include "virerror.h"
#include "nwfilter_conf.h"
#include "nwfilter_ebiptables_driver.h"
#include "virfile.h"
#include "configmake.h"
#include "virstring.h"
#include "virfirewall.h"
#define VIR_FROM_THIS VIR_FROM_NWFILTER
VIR_LOG_INIT("nwfilter.nwfilter_ebiptables_driver");
#define EBTABLES_CHAIN_INCOMING "PREROUTING"
#define EBTABLES_CHAIN_OUTGOING "POSTROUTING"
#define CHAINPREFIX_HOST_IN 'I'
#define CHAINPREFIX_HOST_OUT 'O'
#define CHAINPREFIX_HOST_IN_TEMP 'J'
#define CHAINPREFIX_HOST_OUT_TEMP 'P'
#define PROC_BRIDGE_NF_CALL_IPTABLES \
"/proc/sys/net/bridge/bridge-nf-call-iptables"
#define PROC_BRIDGE_NF_CALL_IP6TABLES \
"/proc/sys/net/bridge/bridge-nf-call-ip6tables"
#define BRIDGE_NF_CALL_ALERT_INTERVAL 10 /* seconds */
#define PRINT_ROOT_CHAIN(buf, prefix, ifname) \
g_snprintf(buf, sizeof(buf), "libvirt-%c-%s", prefix, ifname)
#define PRINT_CHAIN(buf, prefix, ifname, suffix) \
g_snprintf(buf, sizeof(buf), "%c-%s-%s", prefix, ifname, suffix)
#define VIRT_IN_CHAIN "libvirt-in"
#define VIRT_OUT_CHAIN "libvirt-out"
#define VIRT_IN_POST_CHAIN "libvirt-in-post"
#define HOST_IN_CHAIN "libvirt-host-in"
#define PRINT_IPT_ROOT_CHAIN(buf, prefix, ifname) \
g_snprintf(buf, sizeof(buf), "%c%c-%s", prefix[0], prefix[1], ifname)
#define MATCH_PHYSDEV_IN_FW "-m", "physdev", "--physdev-in"
#define MATCH_PHYSDEV_OUT_FW "-m", "physdev", "--physdev-is-bridged", "--physdev-out"
#define MATCH_PHYSDEV_OUT_OLD_FW "-m", "physdev", "--physdev-out"
static int ebtablesRemoveBasicRules(const char *ifname);
static int ebiptablesDriverInit(bool privileged);
static void ebiptablesDriverShutdown(void);
static int ebtablesCleanAll(const char *ifname);
static int ebiptablesAllTeardown(const char *ifname);
struct ushort_map {
unsigned short attr;
const char *val;
};
enum l3_proto_idx {
L3_PROTO_IPV4_IDX = 0,
L3_PROTO_IPV6_IDX,
L3_PROTO_ARP_IDX,
L3_PROTO_RARP_IDX,
L2_PROTO_MAC_IDX,
L2_PROTO_VLAN_IDX,
L2_PROTO_STP_IDX,
L3_PROTO_LAST_IDX
};
#define USHORTMAP_ENTRY_IDX(IDX, ATT, VAL) [IDX] = { .attr = ATT, .val = VAL }
/* A lookup table for translating ethernet protocol IDs to human readable
* strings. None of the human readable strings must be found as a prefix
* in another entry here (example 'ab' would be found in 'abc') to allow
* for prefix matching.
*/
static const struct ushort_map l3_protocols[] = {
USHORTMAP_ENTRY_IDX(L3_PROTO_IPV4_IDX, ETHERTYPE_IP, "ipv4"),
USHORTMAP_ENTRY_IDX(L3_PROTO_IPV6_IDX, ETHERTYPE_IPV6, "ipv6"),
USHORTMAP_ENTRY_IDX(L3_PROTO_ARP_IDX, ETHERTYPE_ARP, "arp"),
USHORTMAP_ENTRY_IDX(L3_PROTO_RARP_IDX, ETHERTYPE_REVARP, "rarp"),
USHORTMAP_ENTRY_IDX(L2_PROTO_VLAN_IDX, ETHERTYPE_VLAN, "vlan"),
USHORTMAP_ENTRY_IDX(L2_PROTO_STP_IDX, 0, "stp"),
USHORTMAP_ENTRY_IDX(L2_PROTO_MAC_IDX, 0, "mac"),
USHORTMAP_ENTRY_IDX(L3_PROTO_LAST_IDX, 0, NULL),
};
static char chainprefixes_host[3] = {
CHAINPREFIX_HOST_IN,
CHAINPREFIX_HOST_OUT,
0
};
static char chainprefixes_host_temp[3] = {
CHAINPREFIX_HOST_IN_TEMP,
CHAINPREFIX_HOST_OUT_TEMP,
0
};
static int
printVar(virNWFilterVarCombIter *vars,
char *buf, int bufsize,
nwItemDesc *item,
bool *done)
{
*done = false;
if ((item->flags & NWFILTER_ENTRY_ITEM_FLAG_HAS_VAR)) {
const char *val;
val = virNWFilterVarCombIterGetVarValue(vars, item->varAccess);
if (!val) {
/* error has been reported */
return -1;
}
if (virStrcpy(buf, val, bufsize) < 0) {
const char *varName;
varName = virNWFilterVarAccessGetVarName(item->varAccess);
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Buffer too small to print variable '%1$s' into"),
varName);
return -1;
}
*done = true;
}
return 0;
}
static int
_printDataType(virNWFilterVarCombIter *vars,
char *buf, int bufsize,
nwItemDesc *item,
bool asHex, bool directionIn)
{
bool done;
g_autofree char *data = NULL;
uint8_t ctr;
g_auto(virBuffer) vb = VIR_BUFFER_INITIALIZER;
g_autofree char *flags = NULL;
if (printVar(vars, buf, bufsize, item, &done) < 0)
return -1;
if (done)
return 0;
switch (item->datatype) {
case DATATYPE_IPADDR:
data = virSocketAddrFormat(&item->u.ipaddr);
if (!data)
return -1;
if (g_snprintf(buf, bufsize, "%s", data) >= bufsize) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("buffer too small for IP address"));
return -1;
}
break;
case DATATYPE_IPV6ADDR:
data = virSocketAddrFormat(&item->u.ipaddr);
if (!data)
return -1;
if (g_snprintf(buf, bufsize, "%s", data) >= bufsize) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("buffer too small for IPv6 address"));
return -1;
}
break;
case DATATYPE_MACADDR:
case DATATYPE_MACMASK:
if (bufsize < VIR_MAC_STRING_BUFLEN) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Buffer too small for MAC address"));
return -1;
}
virMacAddrFormat(&item->u.macaddr, buf);
break;
case DATATYPE_IPV6MASK:
case DATATYPE_IPMASK:
if (g_snprintf(buf, bufsize, "%d",
item->u.u8) >= bufsize) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Buffer too small for uint8 type"));
return -1;
}
break;
case DATATYPE_UINT32:
case DATATYPE_UINT32_HEX:
if (g_snprintf(buf, bufsize, asHex ? "0x%x" : "%u",
item->u.u32) >= bufsize) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Buffer too small for uint32 type"));
return -1;
}
break;
case DATATYPE_UINT16:
case DATATYPE_UINT16_HEX:
if (g_snprintf(buf, bufsize, asHex ? "0x%x" : "%d",
item->u.u16) >= bufsize) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Buffer too small for uint16 type"));
return -1;
}
break;
case DATATYPE_UINT8:
case DATATYPE_UINT8_HEX:
if (g_snprintf(buf, bufsize, asHex ? "0x%x" : "%d",
item->u.u8) >= bufsize) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Buffer too small for uint8 type"));
return -1;
}
break;
case DATATYPE_IPSETNAME:
if (virStrcpy(buf, item->u.ipset.setname, bufsize) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Buffer to small for ipset name"));
return -1;
}
break;
case DATATYPE_IPSETFLAGS:
for (ctr = 0; ctr < item->u.ipset.numFlags; ctr++) {
if (ctr != 0)
virBufferAddLit(&vb, ",");
if ((item->u.ipset.flags & (1 << ctr))) {
if (directionIn)
virBufferAddLit(&vb, "dst");
else
virBufferAddLit(&vb, "src");
} else {
if (directionIn)
virBufferAddLit(&vb, "src");
else
virBufferAddLit(&vb, "dst");
}
}
flags = virBufferContentAndReset(&vb);
if (virStrcpy(buf, flags, bufsize) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Buffer too small for IPSETFLAGS type"));
return -1;
}
break;
case DATATYPE_STRING:
case DATATYPE_STRINGCOPY:
case DATATYPE_BOOLEAN:
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Cannot print data type %1$x"), item->datatype);
return -1;
case DATATYPE_LAST:
default:
virReportEnumRangeError(virNWFilterAttrDataType, item->datatype);
return -1;
}
return 0;
}
static int
printDataType(virNWFilterVarCombIter *vars,
char *buf, int bufsize,
nwItemDesc *item)
{
return _printDataType(vars, buf, bufsize, item, 0, 0);
}
static int
printDataTypeDirection(virNWFilterVarCombIter *vars,
char *buf, int bufsize,
nwItemDesc *item, bool directionIn)
{
return _printDataType(vars, buf, bufsize, item, 0, directionIn);
}
static int
printDataTypeAsHex(virNWFilterVarCombIter *vars,
char *buf, int bufsize,
nwItemDesc *item)
{
return _printDataType(vars, buf, bufsize, item, 1, 0);
}
static int
ebtablesHandleEthHdr(virFirewall *fw,
virFirewallRule *fwrule,
virNWFilterVarCombIter *vars,
ethHdrDataDef *ethHdr,
bool reverse)
{
char macaddr[VIR_MAC_STRING_BUFLEN];
char macmask[VIR_MAC_STRING_BUFLEN];
if (HAS_ENTRY_ITEM(&ethHdr->dataSrcMACAddr)) {
if (printDataType(vars,
macaddr, sizeof(macaddr),
&ethHdr->dataSrcMACAddr) < 0)
return -1;
virFirewallRuleAddArgList(fw, fwrule,
reverse ? "-d" : "-s",
NULL);
if (ENTRY_WANT_NEG_SIGN(&ethHdr->dataSrcMACAddr))
virFirewallRuleAddArg(fw, fwrule, "!");
if (HAS_ENTRY_ITEM(&ethHdr->dataSrcMACMask)) {
if (printDataType(vars,
macmask, sizeof(macmask),
&ethHdr->dataSrcMACMask) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s/%s", macaddr, macmask);
} else {
virFirewallRuleAddArg(fw, fwrule, macaddr);
}
}
if (HAS_ENTRY_ITEM(&ethHdr->dataDstMACAddr)) {
if (printDataType(vars,
macaddr, sizeof(macaddr),
&ethHdr->dataDstMACAddr) < 0)
return -1;
virFirewallRuleAddArgList(fw, fwrule,
reverse ? "-s" : "-d",
NULL);
if (ENTRY_WANT_NEG_SIGN(&ethHdr->dataDstMACAddr))
virFirewallRuleAddArg(fw, fwrule, "!");
if (HAS_ENTRY_ITEM(&ethHdr->dataDstMACMask)) {
if (printDataType(vars,
macmask, sizeof(macmask),
&ethHdr->dataDstMACMask) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s/%s", macaddr, macmask);
} else {
virFirewallRuleAddArg(fw, fwrule, macaddr);
}
}
return 0;
}
/************************ iptables support ************************/
static void
iptablesCreateBaseChainsFW(virFirewall *fw,
virFirewallLayer layer)
{
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-N", VIRT_IN_CHAIN, NULL);
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-N", VIRT_OUT_CHAIN, NULL);
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-N", VIRT_IN_POST_CHAIN, NULL);
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-N", HOST_IN_CHAIN, NULL);
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-D", "FORWARD", "-j", VIRT_IN_CHAIN, NULL);
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-D", "FORWARD", "-j", VIRT_OUT_CHAIN, NULL);
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-D", "FORWARD", "-j", VIRT_IN_POST_CHAIN, NULL);
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-D", "INPUT", "-j", HOST_IN_CHAIN, NULL);
virFirewallAddRule(fw, layer,
"-I", "FORWARD", "1", "-j", VIRT_IN_CHAIN, NULL);
virFirewallAddRule(fw, layer,
"-I", "FORWARD", "2", "-j", VIRT_OUT_CHAIN, NULL);
virFirewallAddRule(fw, layer,
"-I", "FORWARD", "3", "-j", VIRT_IN_POST_CHAIN, NULL);
virFirewallAddRule(fw, layer,
"-I", "INPUT", "1", "-j", HOST_IN_CHAIN, NULL);
}
static void
iptablesCreateTmpRootChainFW(virFirewall *fw,
virFirewallLayer layer,
char prefix,
bool incoming, const char *ifname)
{
char chain[MAX_CHAINNAME_LENGTH];
char chainPrefix[2] = {
prefix,
incoming ? CHAINPREFIX_HOST_IN_TEMP
: CHAINPREFIX_HOST_OUT_TEMP
};
PRINT_IPT_ROOT_CHAIN(chain, chainPrefix, ifname);
virFirewallAddRule(fw, layer,
"-N", chain, NULL);
}
static void
iptablesCreateTmpRootChainsFW(virFirewall *fw,
virFirewallLayer layer,
const char *ifname)
{
iptablesCreateTmpRootChainFW(fw, layer, 'F', false, ifname);
iptablesCreateTmpRootChainFW(fw, layer, 'F', true, ifname);
iptablesCreateTmpRootChainFW(fw, layer, 'H', true, ifname);
}
static void
_iptablesRemoveRootChainFW(virFirewall *fw,
virFirewallLayer layer,
char prefix,
bool incoming, const char *ifname,
int isTempChain)
{
char chain[MAX_CHAINNAME_LENGTH];
char chainPrefix[2] = {
prefix,
};
if (isTempChain)
chainPrefix[1] = incoming ? CHAINPREFIX_HOST_IN_TEMP
: CHAINPREFIX_HOST_OUT_TEMP;
else
chainPrefix[1] = incoming ? CHAINPREFIX_HOST_IN
: CHAINPREFIX_HOST_OUT;
PRINT_IPT_ROOT_CHAIN(chain, chainPrefix, ifname);
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-F", chain, NULL);
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-X", chain, NULL);
}
static void
iptablesRemoveRootChainFW(virFirewall *fw,
virFirewallLayer layer,
char prefix,
bool incoming,
const char *ifname)
{
_iptablesRemoveRootChainFW(fw, layer, prefix, incoming, ifname, false);
}
static void
iptablesRemoveTmpRootChainFW(virFirewall *fw,
virFirewallLayer layer,
char prefix,
bool incoming,
const char *ifname)
{
_iptablesRemoveRootChainFW(fw, layer, prefix,
incoming, ifname, 1);
}
static void
iptablesRemoveTmpRootChainsFW(virFirewall *fw,
virFirewallLayer layer,
const char *ifname)
{
iptablesRemoveTmpRootChainFW(fw, layer, 'F', false, ifname);
iptablesRemoveTmpRootChainFW(fw, layer, 'F', true, ifname);
iptablesRemoveTmpRootChainFW(fw, layer, 'H', true, ifname);
}
static void
iptablesRemoveRootChainsFW(virFirewall *fw,
virFirewallLayer layer,
const char *ifname)
{
iptablesRemoveRootChainFW(fw, layer, 'F', false, ifname);
iptablesRemoveRootChainFW(fw, layer, 'F', true, ifname);
iptablesRemoveRootChainFW(fw, layer, 'H', true, ifname);
}
static void
iptablesLinkTmpRootChainFW(virFirewall *fw,
virFirewallLayer layer,
const char *basechain,
char prefix,
bool incoming, const char *ifname)
{
char chain[MAX_CHAINNAME_LENGTH];
char chainPrefix[2] = {
prefix,
incoming ? CHAINPREFIX_HOST_IN_TEMP
: CHAINPREFIX_HOST_OUT_TEMP
};
PRINT_IPT_ROOT_CHAIN(chain, chainPrefix, ifname);
if (incoming)
virFirewallAddRule(fw, layer,
"-A", basechain,
MATCH_PHYSDEV_IN_FW,
ifname,
"-g", chain, NULL);
else
virFirewallAddRule(fw, layer,
"-A", basechain,
MATCH_PHYSDEV_OUT_FW,
ifname,
"-g", chain, NULL);
}
static void
iptablesLinkTmpRootChainsFW(virFirewall *fw,
virFirewallLayer layer,
const char *ifname)
{
iptablesLinkTmpRootChainFW(fw, layer, VIRT_OUT_CHAIN, 'F', false, ifname);
iptablesLinkTmpRootChainFW(fw, layer, VIRT_IN_CHAIN, 'F', true, ifname);
iptablesLinkTmpRootChainFW(fw, layer, HOST_IN_CHAIN, 'H', true, ifname);
}
static void
iptablesSetupVirtInPostFW(virFirewall *fw G_GNUC_UNUSED,
virFirewallLayer layer G_GNUC_UNUSED,
const char *ifname G_GNUC_UNUSED)
{
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-D", VIRT_IN_POST_CHAIN,
MATCH_PHYSDEV_IN_FW,
ifname, "-j", "ACCEPT", NULL);
virFirewallAddRule(fw, layer,
"-A", VIRT_IN_POST_CHAIN,
MATCH_PHYSDEV_IN_FW,
ifname, "-j", "ACCEPT", NULL);
}
static void
iptablesClearVirtInPostFW(virFirewall *fw,
virFirewallLayer layer,
const char *ifname)
{
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-D", VIRT_IN_POST_CHAIN,
MATCH_PHYSDEV_IN_FW,
ifname, "-j", "ACCEPT", NULL);
}
static void
_iptablesUnlinkRootChainFW(virFirewall *fw,
virFirewallLayer layer,
const char *basechain,
char prefix,
bool incoming, const char *ifname,
int isTempChain)
{
char chain[MAX_CHAINNAME_LENGTH];
char chainPrefix[2] = {
prefix,
};
if (isTempChain)
chainPrefix[1] = incoming ? CHAINPREFIX_HOST_IN_TEMP
: CHAINPREFIX_HOST_OUT_TEMP;
else
chainPrefix[1] = incoming ? CHAINPREFIX_HOST_IN
: CHAINPREFIX_HOST_OUT;
PRINT_IPT_ROOT_CHAIN(chain, chainPrefix, ifname);
if (incoming)
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-D", basechain,
MATCH_PHYSDEV_IN_FW, ifname,
"-g", chain,
NULL);
else
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-D", basechain,
MATCH_PHYSDEV_OUT_FW, ifname,
"-g", chain,
NULL);
/*
* Previous versions of libvirt may have created a rule
* with the --physdev-is-bridged missing. Remove this one
* as well.
*/
if (!incoming)
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-D", basechain,
MATCH_PHYSDEV_OUT_OLD_FW, ifname,
"-g", chain,
NULL);
}
static void
iptablesUnlinkRootChainFW(virFirewall *fw,
virFirewallLayer layer,
const char *basechain,
char prefix,
bool incoming, const char *ifname)
{
_iptablesUnlinkRootChainFW(fw, layer,
basechain, prefix, incoming, ifname, false);
}
static void
iptablesUnlinkTmpRootChainFW(virFirewall *fw,
virFirewallLayer layer,
const char *basechain,
char prefix,
bool incoming, const char *ifname)
{
_iptablesUnlinkRootChainFW(fw, layer,
basechain, prefix, incoming, ifname, 1);
}
static void
iptablesUnlinkRootChainsFW(virFirewall *fw,
virFirewallLayer layer,
const char *ifname)
{
iptablesUnlinkRootChainFW(fw, layer, VIRT_OUT_CHAIN, 'F', false, ifname);
iptablesUnlinkRootChainFW(fw, layer, VIRT_IN_CHAIN, 'F', true, ifname);
iptablesUnlinkRootChainFW(fw, layer, HOST_IN_CHAIN, 'H', true, ifname);
}
static void
iptablesUnlinkTmpRootChainsFW(virFirewall *fw,
virFirewallLayer layer,
const char *ifname)
{
iptablesUnlinkTmpRootChainFW(fw, layer, VIRT_OUT_CHAIN, 'F', false, ifname);
iptablesUnlinkTmpRootChainFW(fw, layer, VIRT_IN_CHAIN, 'F', true, ifname);
iptablesUnlinkTmpRootChainFW(fw, layer, HOST_IN_CHAIN, 'H', true, ifname);
}
static void
iptablesRenameTmpRootChainFW(virFirewall *fw,
virFirewallLayer layer,
char prefix,
bool incoming,
const char *ifname)
{
char tmpchain[MAX_CHAINNAME_LENGTH], chain[MAX_CHAINNAME_LENGTH];
char tmpChainPrefix[2] = {
prefix,
incoming ? CHAINPREFIX_HOST_IN_TEMP
: CHAINPREFIX_HOST_OUT_TEMP
};
char chainPrefix[2] = {
prefix,
incoming ? CHAINPREFIX_HOST_IN
: CHAINPREFIX_HOST_OUT
};
PRINT_IPT_ROOT_CHAIN(tmpchain, tmpChainPrefix, ifname);
PRINT_IPT_ROOT_CHAIN(chain, chainPrefix, ifname);
virFirewallAddRule(fw, layer,
"-E", tmpchain, chain, NULL);
}
static void
iptablesRenameTmpRootChainsFW(virFirewall *fw,
virFirewallLayer layer,
const char *ifname)
{
iptablesRenameTmpRootChainFW(fw, layer, 'F', false, ifname);
iptablesRenameTmpRootChainFW(fw, layer, 'F', true, ifname);
iptablesRenameTmpRootChainFW(fw, layer, 'H', true, ifname);
}
static int
iptablesHandleSrcMacAddr(virFirewall *fw,
virFirewallRule *fwrule,
virNWFilterVarCombIter *vars,
nwItemDesc *srcMacAddr,
bool directionIn,
bool *srcmacskipped)
{
char macaddr[VIR_MAC_STRING_BUFLEN];
*srcmacskipped = false;
if (HAS_ENTRY_ITEM(srcMacAddr)) {
if (directionIn) {
*srcmacskipped = true;
return 0;
}
if (printDataType(vars,
macaddr, sizeof(macaddr),
srcMacAddr) < 0)
return -1;
virFirewallRuleAddArgList(fw, fwrule,
"-m", "mac",
NULL);
if (ENTRY_WANT_NEG_SIGN(srcMacAddr))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArgList(fw, fwrule,
"--mac-source",
macaddr,
NULL);
}
return 0;
}
static int
iptablesHandleIPHdr(virFirewall *fw,
virFirewallRule *fwrule,
virNWFilterVarCombIter *vars,
ipHdrDataDef *ipHdr,
bool directionIn,
bool *skipRule, bool *skipMatch)
{
char ipaddr[INET6_ADDRSTRLEN];
char ipaddralt[INET6_ADDRSTRLEN];
char number[VIR_INT64_STR_BUFLEN];
const char *src = "--source";
const char *dst = "--destination";
const char *srcrange = "--src-range";
const char *dstrange = "--dst-range";
if (directionIn) {
src = "--destination";
dst = "--source";
srcrange = "--dst-range";
dstrange = "--src-range";
}
if (HAS_ENTRY_ITEM(&ipHdr->dataSrcIPAddr)) {
if (printDataType(vars,
ipaddr, sizeof(ipaddr),
&ipHdr->dataSrcIPAddr) < 0)
return -1;
if (ENTRY_WANT_NEG_SIGN(&ipHdr->dataSrcIPAddr))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, src);
if (HAS_ENTRY_ITEM(&ipHdr->dataSrcIPMask)) {
if (printDataType(vars,
number, sizeof(number),
&ipHdr->dataSrcIPMask) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s/%s", ipaddr, number);
} else {
virFirewallRuleAddArg(fw, fwrule, ipaddr);
}
} else if (HAS_ENTRY_ITEM(&ipHdr->dataSrcIPFrom)) {
if (printDataType(vars,
ipaddr, sizeof(ipaddr),
&ipHdr->dataSrcIPFrom) < 0)
return -1;
virFirewallRuleAddArgList(fw, fwrule,
"-m", "iprange",
NULL);
if (ENTRY_WANT_NEG_SIGN(&ipHdr->dataSrcIPFrom))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, srcrange);
if (HAS_ENTRY_ITEM(&ipHdr->dataSrcIPTo)) {
if (printDataType(vars,
ipaddralt, sizeof(ipaddralt),
&ipHdr->dataSrcIPTo) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s-%s", ipaddr, ipaddralt);
} else {
virFirewallRuleAddArg(fw, fwrule, ipaddr);
}
}
if (HAS_ENTRY_ITEM(&ipHdr->dataDstIPAddr)) {
if (printDataType(vars,
ipaddr, sizeof(ipaddr),
&ipHdr->dataDstIPAddr) < 0)
return -1;
if (ENTRY_WANT_NEG_SIGN(&ipHdr->dataDstIPAddr))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, dst);
if (HAS_ENTRY_ITEM(&ipHdr->dataDstIPMask)) {
if (printDataType(vars,
number, sizeof(number),
&ipHdr->dataDstIPMask) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s/%s", ipaddr, number);
} else {
virFirewallRuleAddArg(fw, fwrule, ipaddr);
}
} else if (HAS_ENTRY_ITEM(&ipHdr->dataDstIPFrom)) {
if (printDataType(vars,
ipaddr, sizeof(ipaddr),
&ipHdr->dataDstIPFrom) < 0)
return -1;
virFirewallRuleAddArgList(fw, fwrule,
"-m", "iprange",
NULL);
if (ENTRY_WANT_NEG_SIGN(&ipHdr->dataDstIPFrom))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, dstrange);
if (HAS_ENTRY_ITEM(&ipHdr->dataDstIPTo)) {
if (printDataType(vars,
ipaddralt, sizeof(ipaddralt),
&ipHdr->dataDstIPTo) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s-%s", ipaddr, ipaddralt);
} else {
virFirewallRuleAddArg(fw, fwrule, ipaddr);
}
}
if (HAS_ENTRY_ITEM(&ipHdr->dataDSCP)) {
if (printDataType(vars,
number, sizeof(number),
&ipHdr->dataDSCP) < 0)
return -1;
virFirewallRuleAddArgList(fw, fwrule,
"-m", "dscp",
NULL);
if (ENTRY_WANT_NEG_SIGN(&ipHdr->dataDSCP))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArgList(fw, fwrule,
"--dscp", number,
NULL);
}
if (HAS_ENTRY_ITEM(&ipHdr->dataConnlimitAbove)) {
if (directionIn) {
/* only support for limit in outgoing dir. */
*skipRule = true;
} else {
*skipMatch = true;
}
}
return 0;
}
static int
iptablesHandleIPHdrAfterStateMatch(virFirewall *fw,
virFirewallRule *fwrule,
virNWFilterVarCombIter *vars,
ipHdrDataDef *ipHdr,
bool directionIn)
{
char number[VIR_INT64_STR_BUFLEN];
char str[MAX_IPSET_NAME_LENGTH];
if (HAS_ENTRY_ITEM(&ipHdr->dataIPSet) &&
HAS_ENTRY_ITEM(&ipHdr->dataIPSetFlags)) {
if (printDataType(vars,
str, sizeof(str),
&ipHdr->dataIPSet) < 0)
return -1;
virFirewallRuleAddArgList(fw, fwrule,
"-m", "set",
"--match-set", str,
NULL);
if (printDataTypeDirection(vars,
str, sizeof(str),
&ipHdr->dataIPSetFlags, directionIn) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule, str);
}
if (HAS_ENTRY_ITEM(&ipHdr->dataConnlimitAbove)) {
if (!directionIn) {
if (printDataType(vars,
number, sizeof(number),
&ipHdr->dataConnlimitAbove) < 0)
return -1;
/* place connlimit after potential -m state --state ...
since this is the most useful order */
virFirewallRuleAddArgList(fw, fwrule,
"-m", "connlimit",
NULL);
if (ENTRY_WANT_NEG_SIGN(&ipHdr->dataConnlimitAbove))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArgList(fw, fwrule,
"--connlimit-above", number,
NULL);
}
}
if (HAS_ENTRY_ITEM(&ipHdr->dataComment)) {
/* keep comments behind everything else -- they are packet eval.
no-ops */
virFirewallRuleAddArgList(fw, fwrule,
"-m", "comment",
"--comment", ipHdr->dataComment.u.string,
NULL);
}
return 0;
}
static int
iptablesHandlePortData(virFirewall *fw,
virFirewallRule *fwrule,
virNWFilterVarCombIter *vars,
portDataDef *portData,
bool directionIn)
{
char portstr[20];
char portstralt[20];
const char *sport = "--sport";
const char *dport = "--dport";
if (directionIn) {
sport = "--dport";
dport = "--sport";
}
if (HAS_ENTRY_ITEM(&portData->dataSrcPortStart)) {
if (printDataType(vars,
portstr, sizeof(portstr),
&portData->dataSrcPortStart) < 0)
return -1;
if (ENTRY_WANT_NEG_SIGN(&portData->dataSrcPortStart))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, sport);
if (HAS_ENTRY_ITEM(&portData->dataSrcPortEnd)) {
if (printDataType(vars,
portstralt, sizeof(portstralt),
&portData->dataSrcPortEnd) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s:%s", portstr, portstralt);
} else {
virFirewallRuleAddArg(fw, fwrule, portstr);
}
}
if (HAS_ENTRY_ITEM(&portData->dataDstPortStart)) {
if (printDataType(vars,
portstr, sizeof(portstr),
&portData->dataDstPortStart) < 0)
return -1;
if (ENTRY_WANT_NEG_SIGN(&portData->dataDstPortStart))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, dport);
if (HAS_ENTRY_ITEM(&portData->dataDstPortEnd)) {
if (printDataType(vars,
portstralt, sizeof(portstralt),
&portData->dataDstPortEnd) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s:%s", portstr, portstralt);
} else {
virFirewallRuleAddArg(fw, fwrule, portstr);
}
}
return 0;
}
static void
iptablesEnforceDirection(virFirewall *fw,
virFirewallRule *fwrule,
bool directionIn,
virNWFilterRuleDef *rule)
{
if (rule->tt != VIR_NWFILTER_RULE_DIRECTION_INOUT)
virFirewallRuleAddArgList(fw, fwrule,
"-m", "conntrack",
"--ctdir",
(directionIn ?
"Reply" :
"Original"),
NULL);
}
/*
* _iptablesCreateRuleInstance:
* @fw: the firewall ruleset instance
* @layer: the firewall layer
* @chainPrefix : The prefix to put in front of the name of the chain
* @rule: The rule of the filter to convert
* @ifname : The name of the interface to apply the rule to
* @vars : A map containing the variables to resolve
* @match : optional string for state match
* @accept_target : where to jump to on accepted traffic, i.e., "RETURN"
* "ACCEPT"
* @maySkipICMP : whether this rule may under certain circumstances skip
* the ICMP rule from being created
*
* Convert a single rule into its representation for later instantiation
*
* Returns 0 in case of success with the result stored in the data structure
* pointed to by res, != 0 otherwise.
*/
static int
_iptablesCreateRuleInstance(virFirewall *fw,
virFirewallLayer layer,
bool directionIn,
const char *chainPrefix,
virNWFilterRuleDef *rule,
const char *ifname,
virNWFilterVarCombIter *vars,
const char *match, bool defMatch,
const char *accept_target,
bool maySkipICMP)
{
char chain[MAX_CHAINNAME_LENGTH];
char number[VIR_INT64_STR_BUFLEN];
char numberalt[VIR_INT64_STR_BUFLEN];
const char *target;
bool srcMacSkipped = false;
bool skipRule = false;
bool skipMatch = false;
bool hasICMPType = false;
virFirewallRule *fwrule;
size_t fwruleargs;
PRINT_IPT_ROOT_CHAIN(chain, chainPrefix, ifname);
switch ((int)rule->prtclType) {
case VIR_NWFILTER_RULE_PROTOCOL_TCP:
case VIR_NWFILTER_RULE_PROTOCOL_TCPoIPV6:
fwrule = virFirewallAddRule(fw, layer,
"-A", chain,
"-p", "tcp",
NULL);
fwruleargs = virFirewallRuleGetArgCount(fwrule);
if (iptablesHandleSrcMacAddr(fw, fwrule,
vars,
&rule->p.tcpHdrFilter.dataSrcMACAddr,
directionIn,
&srcMacSkipped) < 0)
return -1;
if (iptablesHandleIPHdr(fw, fwrule,
vars,
&rule->p.tcpHdrFilter.ipHdr,
directionIn,
&skipRule, &skipMatch) < 0)
return -1;
if (HAS_ENTRY_ITEM(&rule->p.tcpHdrFilter.dataTCPFlags)) {
g_autofree char *mask = NULL;
g_autofree char *flags = NULL;
if (ENTRY_WANT_NEG_SIGN(&rule->p.tcpHdrFilter.dataTCPFlags))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, "--tcp-flags");
if (!(mask = virNWFilterPrintTCPFlags(rule->p.tcpHdrFilter.dataTCPFlags.u.tcpFlags.mask)))
return -1;
virFirewallRuleAddArg(fw, fwrule, mask);
if (!(flags = virNWFilterPrintTCPFlags(rule->p.tcpHdrFilter.dataTCPFlags.u.tcpFlags.flags)))
return -1;
virFirewallRuleAddArg(fw, fwrule, flags);
}
if (iptablesHandlePortData(fw, fwrule,
vars,
&rule->p.tcpHdrFilter.portData,
directionIn) < 0)
return -1;
if (HAS_ENTRY_ITEM(&rule->p.tcpHdrFilter.dataTCPOption)) {
if (printDataType(vars,
number, sizeof(number),
&rule->p.tcpHdrFilter.dataTCPOption) < 0)
return -1;
if (ENTRY_WANT_NEG_SIGN(&rule->p.tcpHdrFilter.dataTCPOption))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArgList(fw, fwrule,
"--tcp-option", number, NULL);
}
break;
case VIR_NWFILTER_RULE_PROTOCOL_UDP:
case VIR_NWFILTER_RULE_PROTOCOL_UDPoIPV6:
fwrule = virFirewallAddRule(fw, layer,
"-A", chain,
"-p", "udp",
NULL);
fwruleargs = virFirewallRuleGetArgCount(fwrule);
if (iptablesHandleSrcMacAddr(fw, fwrule,
vars,
&rule->p.udpHdrFilter.dataSrcMACAddr,
directionIn,
&srcMacSkipped) < 0)
return -1;
if (iptablesHandleIPHdr(fw, fwrule,
vars,
&rule->p.udpHdrFilter.ipHdr,
directionIn,
&skipRule, &skipMatch) < 0)
return -1;
if (iptablesHandlePortData(fw, fwrule,
vars,
&rule->p.udpHdrFilter.portData,
directionIn) < 0)
return -1;
break;
case VIR_NWFILTER_RULE_PROTOCOL_UDPLITE:
case VIR_NWFILTER_RULE_PROTOCOL_UDPLITEoIPV6:
fwrule = virFirewallAddRule(fw, layer,
"-A", chain,
"-p", "udplite",
NULL);
fwruleargs = virFirewallRuleGetArgCount(fwrule);
if (iptablesHandleSrcMacAddr(fw, fwrule,
vars,
&rule->p.udpliteHdrFilter.dataSrcMACAddr,
directionIn,
&srcMacSkipped) < 0)
return -1;
if (iptablesHandleIPHdr(fw, fwrule,
vars,
&rule->p.udpliteHdrFilter.ipHdr,
directionIn,
&skipRule, &skipMatch) < 0)
return -1;
break;
case VIR_NWFILTER_RULE_PROTOCOL_ESP:
case VIR_NWFILTER_RULE_PROTOCOL_ESPoIPV6:
fwrule = virFirewallAddRule(fw, layer,
"-A", chain,
"-p", "esp",
NULL);
fwruleargs = virFirewallRuleGetArgCount(fwrule);
if (iptablesHandleSrcMacAddr(fw, fwrule,
vars,
&rule->p.espHdrFilter.dataSrcMACAddr,
directionIn,
&srcMacSkipped) < 0)
return -1;
if (iptablesHandleIPHdr(fw, fwrule,
vars,
&rule->p.espHdrFilter.ipHdr,
directionIn,
&skipRule, &skipMatch) < 0)
return -1;
break;
case VIR_NWFILTER_RULE_PROTOCOL_AH:
case VIR_NWFILTER_RULE_PROTOCOL_AHoIPV6:
fwrule = virFirewallAddRule(fw, layer,
"-A", chain,
"-p", "ah",
NULL);
fwruleargs = virFirewallRuleGetArgCount(fwrule);
if (iptablesHandleSrcMacAddr(fw, fwrule,
vars,
&rule->p.ahHdrFilter.dataSrcMACAddr,
directionIn,
&srcMacSkipped) < 0)
return -1;
if (iptablesHandleIPHdr(fw, fwrule,
vars,
&rule->p.ahHdrFilter.ipHdr,
directionIn,
&skipRule, &skipMatch) < 0)
return -1;
break;
case VIR_NWFILTER_RULE_PROTOCOL_SCTP:
case VIR_NWFILTER_RULE_PROTOCOL_SCTPoIPV6:
fwrule = virFirewallAddRule(fw, layer,
"-A", chain,
"-p", "sctp",
NULL);
fwruleargs = virFirewallRuleGetArgCount(fwrule);
if (iptablesHandleSrcMacAddr(fw, fwrule,
vars,
&rule->p.sctpHdrFilter.dataSrcMACAddr,
directionIn,
&srcMacSkipped) < 0)
return -1;
if (iptablesHandleIPHdr(fw, fwrule,
vars,
&rule->p.sctpHdrFilter.ipHdr,
directionIn,
&skipRule, &skipMatch) < 0)
return -1;
if (iptablesHandlePortData(fw, fwrule,
vars,
&rule->p.sctpHdrFilter.portData,
directionIn) < 0)
return -1;
break;
case VIR_NWFILTER_RULE_PROTOCOL_ICMP:
case VIR_NWFILTER_RULE_PROTOCOL_ICMPV6:
fwrule = virFirewallAddRule(fw, layer,
"-A", chain,
NULL);
if (rule->prtclType == VIR_NWFILTER_RULE_PROTOCOL_ICMP)
virFirewallRuleAddArgList(fw, fwrule,
"-p", "icmp", NULL);
else
virFirewallRuleAddArgList(fw, fwrule,
"-p", "icmpv6", NULL);
fwruleargs = virFirewallRuleGetArgCount(fwrule);
if (iptablesHandleSrcMacAddr(fw, fwrule,
vars,
&rule->p.icmpHdrFilter.dataSrcMACAddr,
directionIn,
&srcMacSkipped) < 0)
return -1;
if (iptablesHandleIPHdr(fw, fwrule,
vars,
&rule->p.icmpHdrFilter.ipHdr,
directionIn,
&skipRule, &skipMatch) < 0)
return -1;
if (HAS_ENTRY_ITEM(&rule->p.icmpHdrFilter.dataICMPType)) {
const char *parm;
hasICMPType = true;
if (maySkipICMP) {
virFirewallRemoveRule(fw, fwrule);
return 0;
}
if (rule->prtclType == VIR_NWFILTER_RULE_PROTOCOL_ICMP)
parm = "--icmp-type";
else
parm = "--icmpv6-type";
if (printDataType(vars,
number, sizeof(number),
&rule->p.icmpHdrFilter.dataICMPType) < 0)
return -1;
if (ENTRY_WANT_NEG_SIGN(&rule->p.icmpHdrFilter.dataICMPType))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, parm);
if (HAS_ENTRY_ITEM(&rule->p.icmpHdrFilter.dataICMPCode)) {
if (printDataType(vars,
numberalt, sizeof(numberalt),
&rule->p.icmpHdrFilter.dataICMPCode) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s/%s", number, numberalt);
} else {
virFirewallRuleAddArg(fw, fwrule, number);
}
}
break;
case VIR_NWFILTER_RULE_PROTOCOL_IGMP:
fwrule = virFirewallAddRule(fw, layer,
"-A", chain,
"-p", "igmp",
NULL);
fwruleargs = virFirewallRuleGetArgCount(fwrule);
if (iptablesHandleSrcMacAddr(fw, fwrule,
vars,
&rule->p.igmpHdrFilter.dataSrcMACAddr,
directionIn,
&srcMacSkipped) < 0)
return -1;
if (iptablesHandleIPHdr(fw, fwrule,
vars,
&rule->p.igmpHdrFilter.ipHdr,
directionIn,
&skipRule, &skipMatch) < 0)
return -1;
break;
case VIR_NWFILTER_RULE_PROTOCOL_ALL:
case VIR_NWFILTER_RULE_PROTOCOL_ALLoIPV6:
fwrule = virFirewallAddRule(fw, layer,
"-A", chain,
"-p", "all",
NULL);
fwruleargs = virFirewallRuleGetArgCount(fwrule);
if (iptablesHandleSrcMacAddr(fw, fwrule,
vars,
&rule->p.allHdrFilter.dataSrcMACAddr,
directionIn,
&srcMacSkipped) < 0)
return -1;
if (iptablesHandleIPHdr(fw, fwrule,
vars,
&rule->p.allHdrFilter.ipHdr,
directionIn,
&skipRule, &skipMatch) < 0)
return -1;
break;
default:
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unexpected protocol %1$d"),
rule->prtclType);
return -1;
}
if ((srcMacSkipped &&
fwruleargs == virFirewallRuleGetArgCount(fwrule)) ||
skipRule) {
virFirewallRemoveRule(fw, fwrule);
return 0;
}
if (rule->action == VIR_NWFILTER_RULE_ACTION_ACCEPT) {
target = accept_target;
} else {
target = virNWFilterJumpTargetTypeToString(rule->action);
skipMatch = defMatch;
}
if (match && !skipMatch) {
virFirewallRuleAddArgList(fw, fwrule,
"-m", "conntrack",
"--ctstate", match,
NULL);
}
if (defMatch && match != NULL && !skipMatch && !hasICMPType)
iptablesEnforceDirection(fw, fwrule,
directionIn,
rule);
if (iptablesHandleIPHdrAfterStateMatch(fw, fwrule,
vars,
&rule->p.allHdrFilter.ipHdr,
directionIn) < 0)
return -1;
virFirewallRuleAddArgList(fw, fwrule,
"-j", target, NULL);
return 0;
}
static int
printStateMatchFlags(int32_t flags, char **bufptr)
{
g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
virNWFilterPrintStateMatchFlags(&buf,
"",
flags,
false);
*bufptr = virBufferContentAndReset(&buf);
return 0;
}
static int
iptablesCreateRuleInstanceStateCtrl(virFirewall *fw,
virFirewallLayer layer,
virNWFilterRuleDef *rule,
const char *ifname,
virNWFilterVarCombIter *vars)
{
int rc = 0;
bool directionIn = false;
char chainPrefix[2];
bool maySkipICMP, inout = false;
g_autofree char *matchState1 = NULL;
g_autofree char *matchState2 = NULL;
g_autofree char *matchState3 = NULL;
bool create;
if ((rule->tt == VIR_NWFILTER_RULE_DIRECTION_IN) ||
(rule->tt == VIR_NWFILTER_RULE_DIRECTION_INOUT)) {
directionIn = true;
inout = (rule->tt == VIR_NWFILTER_RULE_DIRECTION_INOUT);
}
chainPrefix[0] = 'F';
maySkipICMP = directionIn || inout;
create = true;
if (directionIn && !inout) {
if ((rule->flags & IPTABLES_STATE_FLAGS))
create = false;
}
if (create && (rule->flags & IPTABLES_STATE_FLAGS)) {
if (printStateMatchFlags(rule->flags, &matchState1) < 0)
return -1;
}
chainPrefix[1] = CHAINPREFIX_HOST_IN_TEMP;
if (create) {
rc = _iptablesCreateRuleInstance(fw,
layer,
directionIn,
chainPrefix,
rule,
ifname,
vars,
matchState1, false,
"RETURN",
maySkipICMP);
if (rc < 0)
return rc;
}
maySkipICMP = !directionIn || inout;
create = true;
if (!directionIn) {
if ((rule->flags & IPTABLES_STATE_FLAGS))
create = false;
}
if (create && (rule->flags & IPTABLES_STATE_FLAGS)) {
if (printStateMatchFlags(rule->flags, &matchState2) < 0)
return -1;
}
chainPrefix[1] = CHAINPREFIX_HOST_OUT_TEMP;
if (create) {
rc = _iptablesCreateRuleInstance(fw,
layer,
!directionIn,
chainPrefix,
rule,
ifname,
vars,
matchState2, false,
"ACCEPT",
maySkipICMP);
if (rc < 0)
return rc;
}
maySkipICMP = directionIn;
create = true;
if (directionIn && !inout) {
if ((rule->flags & IPTABLES_STATE_FLAGS))
create = false;
} else {
if ((rule->flags & IPTABLES_STATE_FLAGS)) {
if (printStateMatchFlags(rule->flags, &matchState3) < 0)
return -1;
}
}
if (create) {
chainPrefix[0] = 'H';
chainPrefix[1] = CHAINPREFIX_HOST_IN_TEMP;
rc = _iptablesCreateRuleInstance(fw,
layer,
directionIn,
chainPrefix,
rule,
ifname,
vars,
matchState3, false,
"RETURN",
maySkipICMP);
}
return rc;
}
static int
iptablesCreateRuleInstance(virFirewall *fw,
virFirewallLayer layer,
virNWFilterRuleDef *rule,
const char *ifname,
virNWFilterVarCombIter *vars)
{
int rc;
bool directionIn = false;
char chainPrefix[2];
bool needState = true;
bool maySkipICMP, inout = false;
const char *matchState;
if (!(rule->flags & RULE_FLAG_NO_STATEMATCH) &&
(rule->flags & IPTABLES_STATE_FLAGS)) {
return iptablesCreateRuleInstanceStateCtrl(fw,
layer,
rule,
ifname,
vars);
}
if ((rule->tt == VIR_NWFILTER_RULE_DIRECTION_IN) ||
(rule->tt == VIR_NWFILTER_RULE_DIRECTION_INOUT)) {
directionIn = true;
inout = (rule->tt == VIR_NWFILTER_RULE_DIRECTION_INOUT);
if (inout)
needState = false;
}
if ((rule->flags & RULE_FLAG_NO_STATEMATCH))
needState = false;
chainPrefix[0] = 'F';
maySkipICMP = directionIn || inout;
if (needState)
matchState = directionIn ? "ESTABLISHED" : "NEW,ESTABLISHED";
else
matchState = NULL;
chainPrefix[1] = CHAINPREFIX_HOST_IN_TEMP;
rc = _iptablesCreateRuleInstance(fw,
layer,
directionIn,
chainPrefix,
rule,
ifname,
vars,
matchState, true,
"RETURN",
maySkipICMP);
if (rc < 0)
return rc;
maySkipICMP = !directionIn || inout;
if (needState)
matchState = directionIn ? "NEW,ESTABLISHED" : "ESTABLISHED";
else
matchState = NULL;
chainPrefix[1] = CHAINPREFIX_HOST_OUT_TEMP;
rc = _iptablesCreateRuleInstance(fw,
layer,
!directionIn,
chainPrefix,
rule,
ifname,
vars,
matchState, true,
"ACCEPT",
maySkipICMP);
if (rc < 0)
return rc;
maySkipICMP = directionIn;
if (needState)
matchState = directionIn ? "ESTABLISHED" : "NEW,ESTABLISHED";
else
matchState = NULL;
chainPrefix[0] = 'H';
chainPrefix[1] = CHAINPREFIX_HOST_IN_TEMP;
rc = _iptablesCreateRuleInstance(fw,
layer,
directionIn,
chainPrefix,
rule,
ifname,
vars,
matchState, true,
"RETURN",
maySkipICMP);
return rc;
}
/*
* ebtablesCreateRuleInstance:
* @fw: the firewall ruleset to add to
* @chainPrefix : The prefix to put in front of the name of the chain
* @chainSuffix: The suffix to put on the end of the name of the chain
* @rule: The rule of the filter to convert
* @ifname : The name of the interface to apply the rule to
* @vars : A map containing the variables to resolve
* @reverse : Whether to reverse src and dst attributes
*
* Convert a single rule into its representation for later instantiation
*
* Returns 0 in case of success with the result stored in the data structure
* pointed to by res, != 0 otherwise.
*/
static int
ebtablesCreateRuleInstance(virFirewall *fw,
char chainPrefix,
const char *chainSuffix,
virNWFilterRuleDef *rule,
const char *ifname,
virNWFilterVarCombIter *vars,
bool reverse)
{
char macaddr[VIR_MAC_STRING_BUFLEN];
char ipaddr[INET_ADDRSTRLEN];
char ipmask[INET_ADDRSTRLEN];
char ipv6addr[INET6_ADDRSTRLEN];
char number[VIR_INT64_STR_BUFLEN];
char numberalt[VIR_INT64_STR_BUFLEN];
char field[VIR_INT64_STR_BUFLEN];
char fieldalt[VIR_INT64_STR_BUFLEN];
char chain[MAX_CHAINNAME_LENGTH];
const char *target;
bool hasMask = false;
virFirewallRule *fwrule;
if (STREQ(chainSuffix,
virNWFilterChainSuffixTypeToString(
VIR_NWFILTER_CHAINSUFFIX_ROOT)))
PRINT_ROOT_CHAIN(chain, chainPrefix, ifname);
else
PRINT_CHAIN(chain, chainPrefix, ifname,
chainSuffix);
#define INST_ITEM(STRUCT, ITEM, CLI) \
if (HAS_ENTRY_ITEM(&rule->p.STRUCT.ITEM)) { \
if (printDataType(vars, \
field, sizeof(field), \
&rule->p.STRUCT.ITEM) < 0) \
return -1; \
virFirewallRuleAddArg(fw, fwrule, CLI); \
if (ENTRY_WANT_NEG_SIGN(&rule->p.STRUCT.ITEM)) \
virFirewallRuleAddArg(fw, fwrule, "!"); \
virFirewallRuleAddArg(fw, fwrule, field); \
}
#define INST_ITEM_2PARMS(STRUCT, ITEM, ITEM_HI, CLI, SEP) \
if (HAS_ENTRY_ITEM(&rule->p.STRUCT.ITEM)) { \
if (printDataType(vars, \
field, sizeof(field), \
&rule->p.STRUCT.ITEM) < 0) \
return -1; \
virFirewallRuleAddArg(fw, fwrule, CLI); \
if (ENTRY_WANT_NEG_SIGN(&rule->p.STRUCT.ITEM)) \
virFirewallRuleAddArg(fw, fwrule, "!"); \
if (HAS_ENTRY_ITEM(&rule->p.STRUCT.ITEM_HI)) { \
if (printDataType(vars, \
fieldalt, sizeof(fieldalt), \
&rule->p.STRUCT.ITEM_HI) < 0) \
return -1; \
virFirewallRuleAddArgFormat(fw, fwrule, \
"%s%s%s", field, SEP, fieldalt); \
} else { \
virFirewallRuleAddArg(fw, fwrule, field); \
} \
}
#define INST_ITEM_RANGE(S, I, I_HI, C) \
INST_ITEM_2PARMS(S, I, I_HI, C, ":")
#define INST_ITEM_MASK(S, I, MASK, C) \
INST_ITEM_2PARMS(S, I, MASK, C, "/")
switch ((int)rule->prtclType) {
case VIR_NWFILTER_RULE_PROTOCOL_MAC:
fwrule = virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat",
"-A", chain, NULL);
if (ebtablesHandleEthHdr(fw, fwrule,
vars,
&rule->p.ethHdrFilter.ethHdr,
reverse) < 0)
return -1;
if (HAS_ENTRY_ITEM(&rule->p.ethHdrFilter.dataProtocolID)) {
if (printDataTypeAsHex(vars,
number, sizeof(number),
&rule->p.ethHdrFilter.dataProtocolID) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule, "-p");
if (ENTRY_WANT_NEG_SIGN(&rule->p.ethHdrFilter.dataProtocolID))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, number);
}
break;
case VIR_NWFILTER_RULE_PROTOCOL_VLAN:
fwrule = virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain, NULL);
if (ebtablesHandleEthHdr(fw, fwrule,
vars,
&rule->p.vlanHdrFilter.ethHdr,
reverse) < 0)
return -1;
virFirewallRuleAddArgList(fw, fwrule,
"-p", "0x8100", NULL);
INST_ITEM(vlanHdrFilter, dataVlanID, "--vlan-id")
INST_ITEM(vlanHdrFilter, dataVlanEncap, "--vlan-encap")
break;
case VIR_NWFILTER_RULE_PROTOCOL_STP:
/* cannot handle inout direction with srcmask set in reverse dir.
since this clashes with -d below... */
if (reverse &&
HAS_ENTRY_ITEM(&rule->p.stpHdrFilter.ethHdr.dataSrcMACAddr)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("STP filtering in %1$s direction with source MAC address set is not supported"),
virNWFilterRuleDirectionTypeToString(
VIR_NWFILTER_RULE_DIRECTION_INOUT));
return -1;
}
fwrule = virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain, NULL);
if (ebtablesHandleEthHdr(fw, fwrule,
vars,
&rule->p.stpHdrFilter.ethHdr,
reverse) < 0)
return -1;
virFirewallRuleAddArgList(fw, fwrule,
"-d", NWFILTER_MAC_BGA, NULL);
INST_ITEM(stpHdrFilter, dataType, "--stp-type")
INST_ITEM(stpHdrFilter, dataFlags, "--stp-flags")
INST_ITEM_RANGE(stpHdrFilter, dataRootPri, dataRootPriHi,
"--stp-root-pri");
INST_ITEM_MASK(stpHdrFilter, dataRootAddr, dataRootAddrMask,
"--stp-root-addr");
INST_ITEM_RANGE(stpHdrFilter, dataRootCost, dataRootCostHi,
"--stp-root-cost");
INST_ITEM_RANGE(stpHdrFilter, dataSndrPrio, dataSndrPrioHi,
"--stp-sender-prio");
INST_ITEM_MASK(stpHdrFilter, dataSndrAddr, dataSndrAddrMask,
"--stp-sender-addr");
INST_ITEM_RANGE(stpHdrFilter, dataPort, dataPortHi, "--stp-port");
INST_ITEM_RANGE(stpHdrFilter, dataAge, dataAgeHi, "--stp-msg-age");
INST_ITEM_RANGE(stpHdrFilter, dataMaxAge, dataMaxAgeHi,
"--stp-max-age");
INST_ITEM_RANGE(stpHdrFilter, dataHelloTime, dataHelloTimeHi,
"--stp-hello-time");
INST_ITEM_RANGE(stpHdrFilter, dataFwdDelay, dataFwdDelayHi,
"--stp-forward-delay");
break;
case VIR_NWFILTER_RULE_PROTOCOL_ARP:
case VIR_NWFILTER_RULE_PROTOCOL_RARP:
fwrule = virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain, NULL);
if (ebtablesHandleEthHdr(fw, fwrule,
vars,
&rule->p.arpHdrFilter.ethHdr,
reverse) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule, "-p");
virFirewallRuleAddArgFormat(fw, fwrule, "0x%x",
(rule->prtclType == VIR_NWFILTER_RULE_PROTOCOL_ARP)
? l3_protocols[L3_PROTO_ARP_IDX].attr
: l3_protocols[L3_PROTO_RARP_IDX].attr);
if (HAS_ENTRY_ITEM(&rule->p.arpHdrFilter.dataHWType)) {
if (printDataType(vars,
number, sizeof(number),
&rule->p.arpHdrFilter.dataHWType) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule, "--arp-htype");
if (ENTRY_WANT_NEG_SIGN(&rule->p.arpHdrFilter.dataHWType))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, number);
}
if (HAS_ENTRY_ITEM(&rule->p.arpHdrFilter.dataOpcode)) {
if (printDataType(vars,
number, sizeof(number),
&rule->p.arpHdrFilter.dataOpcode) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule, "--arp-opcode");
if (ENTRY_WANT_NEG_SIGN(&rule->p.arpHdrFilter.dataOpcode))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, number);
}
if (HAS_ENTRY_ITEM(&rule->p.arpHdrFilter.dataProtocolType)) {
if (printDataTypeAsHex(vars,
number, sizeof(number),
&rule->p.arpHdrFilter.dataProtocolType) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule, "--arp-ptype");
if (ENTRY_WANT_NEG_SIGN(&rule->p.arpHdrFilter.dataProtocolType))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, number);
}
if (HAS_ENTRY_ITEM(&rule->p.arpHdrFilter.dataARPSrcIPAddr)) {
if (printDataType(vars,
ipaddr, sizeof(ipaddr),
&rule->p.arpHdrFilter.dataARPSrcIPAddr) < 0)
return -1;
if (HAS_ENTRY_ITEM(&rule->p.arpHdrFilter.dataARPSrcIPMask)) {
if (printDataType(vars,
ipmask, sizeof(ipmask),
&rule->p.arpHdrFilter.dataARPSrcIPMask) < 0)
return -1;
hasMask = true;
}
virFirewallRuleAddArg(fw, fwrule,
reverse ? "--arp-ip-dst" : "--arp-ip-src");
if (ENTRY_WANT_NEG_SIGN(&rule->p.arpHdrFilter.dataARPSrcIPAddr))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArgFormat(fw, fwrule,
"%s/%s", ipaddr, hasMask ? ipmask : "32");
}
if (HAS_ENTRY_ITEM(&rule->p.arpHdrFilter.dataARPDstIPAddr)) {
if (printDataType(vars,
ipaddr, sizeof(ipaddr),
&rule->p.arpHdrFilter.dataARPDstIPAddr) < 0)
return -1;
if (HAS_ENTRY_ITEM(&rule->p.arpHdrFilter.dataARPDstIPMask)) {
if (printDataType(vars,
ipmask, sizeof(ipmask),
&rule->p.arpHdrFilter.dataARPDstIPMask) < 0)
return -1;
hasMask = true;
}
virFirewallRuleAddArg(fw, fwrule,
reverse ? "--arp-ip-src" : "--arp-ip-dst");
if (ENTRY_WANT_NEG_SIGN(&rule->p.arpHdrFilter.dataARPDstIPAddr))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArgFormat(fw, fwrule,
"%s/%s", ipaddr, hasMask ? ipmask : "32");
}
if (HAS_ENTRY_ITEM(&rule->p.arpHdrFilter.dataARPSrcMACAddr)) {
if (printDataType(vars,
macaddr, sizeof(macaddr),
&rule->p.arpHdrFilter.dataARPSrcMACAddr) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule,
reverse ? "--arp-mac-dst" : "--arp-mac-src");
if (ENTRY_WANT_NEG_SIGN(&rule->p.arpHdrFilter.dataARPSrcMACAddr))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, macaddr);
}
if (HAS_ENTRY_ITEM(&rule->p.arpHdrFilter.dataARPDstMACAddr)) {
if (printDataType(vars,
macaddr, sizeof(macaddr),
&rule->p.arpHdrFilter.dataARPDstMACAddr) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule,
reverse ? "--arp-mac-src" : "--arp-mac-dst");
if (ENTRY_WANT_NEG_SIGN(&rule->p.arpHdrFilter.dataARPDstMACAddr))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, macaddr);
}
if (HAS_ENTRY_ITEM(&rule->p.arpHdrFilter.dataGratuitousARP) &&
rule->p.arpHdrFilter.dataGratuitousARP.u.boolean) {
if (ENTRY_WANT_NEG_SIGN(&rule->p.arpHdrFilter.dataGratuitousARP))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, "--arp-gratuitous");
}
break;
case VIR_NWFILTER_RULE_PROTOCOL_IP:
fwrule = virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain, NULL);
if (ebtablesHandleEthHdr(fw, fwrule,
vars,
&rule->p.ipHdrFilter.ethHdr,
reverse) < 0)
return -1;
virFirewallRuleAddArgList(fw, fwrule,
"-p", "ipv4", NULL);
if (HAS_ENTRY_ITEM(&rule->p.ipHdrFilter.ipHdr.dataSrcIPAddr)) {
if (printDataType(vars,
ipaddr, sizeof(ipaddr),
&rule->p.ipHdrFilter.ipHdr.dataSrcIPAddr) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule,
reverse ? "--ip-destination" : "--ip-source");
if (ENTRY_WANT_NEG_SIGN(&rule->p.ipHdrFilter.ipHdr.dataSrcIPAddr))
virFirewallRuleAddArg(fw, fwrule, "!");
if (HAS_ENTRY_ITEM(&rule->p.ipHdrFilter.ipHdr.dataSrcIPMask)) {
if (printDataType(vars,
number, sizeof(number),
&rule->p.ipHdrFilter.ipHdr.dataSrcIPMask) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s/%s", ipaddr, number);
} else {
virFirewallRuleAddArg(fw, fwrule, ipaddr);
}
}
if (HAS_ENTRY_ITEM(&rule->p.ipHdrFilter.ipHdr.dataDstIPAddr)) {
if (printDataType(vars,
ipaddr, sizeof(ipaddr),
&rule->p.ipHdrFilter.ipHdr.dataDstIPAddr) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule,
reverse ? "--ip-source" : "--ip-destination");
if (ENTRY_WANT_NEG_SIGN(&rule->p.ipHdrFilter.ipHdr.dataDstIPAddr))
virFirewallRuleAddArg(fw, fwrule, "!");
if (HAS_ENTRY_ITEM(&rule->p.ipHdrFilter.ipHdr.dataDstIPMask)) {
if (printDataType(vars,
number, sizeof(number),
&rule->p.ipHdrFilter.ipHdr.dataDstIPMask) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s/%s", ipaddr, number);
} else {
virFirewallRuleAddArg(fw, fwrule, ipaddr);
}
}
if (HAS_ENTRY_ITEM(&rule->p.ipHdrFilter.ipHdr.dataProtocolID)) {
if (printDataType(vars,
number, sizeof(number),
&rule->p.ipHdrFilter.ipHdr.dataProtocolID) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule, "--ip-protocol");
if (ENTRY_WANT_NEG_SIGN(&rule->p.ipHdrFilter.ipHdr.dataProtocolID))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, number);
}
if (HAS_ENTRY_ITEM(&rule->p.ipHdrFilter.portData.dataSrcPortStart)) {
if (printDataType(vars,
number, sizeof(number),
&rule->p.ipHdrFilter.portData.dataSrcPortStart) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule,
reverse ? "--ip-destination-port" : "--ip-source-port");
if (ENTRY_WANT_NEG_SIGN(&rule->p.ipHdrFilter.portData.dataSrcPortStart))
virFirewallRuleAddArg(fw, fwrule, "!");
if (HAS_ENTRY_ITEM(&rule->p.ipHdrFilter.portData.dataSrcPortEnd)) {
if (printDataType(vars,
numberalt, sizeof(numberalt),
&rule->p.ipHdrFilter.portData.dataSrcPortEnd) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s:%s", number, numberalt);
} else {
virFirewallRuleAddArg(fw, fwrule, number);
}
}
if (HAS_ENTRY_ITEM(&rule->p.ipHdrFilter.portData.dataDstPortStart)) {
if (printDataType(vars,
number, sizeof(number),
&rule->p.ipHdrFilter.portData.dataDstPortStart) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule,
reverse ? "--ip-source-port" : "--ip-destination-port");
if (ENTRY_WANT_NEG_SIGN(&rule->p.ipHdrFilter.portData.dataDstPortStart))
virFirewallRuleAddArg(fw, fwrule, "!");
if (HAS_ENTRY_ITEM(&rule->p.ipHdrFilter.portData.dataDstPortEnd)) {
if (printDataType(vars,
numberalt, sizeof(numberalt),
&rule->p.ipHdrFilter.portData.dataDstPortEnd) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s:%s", number, numberalt);
} else {
virFirewallRuleAddArg(fw, fwrule, number);
}
}
if (HAS_ENTRY_ITEM(&rule->p.ipHdrFilter.ipHdr.dataDSCP)) {
if (printDataTypeAsHex(vars,
number, sizeof(number),
&rule->p.ipHdrFilter.ipHdr.dataDSCP) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule, "--ip-tos");
if (ENTRY_WANT_NEG_SIGN(&rule->p.ipHdrFilter.ipHdr.dataDSCP))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, number);
}
break;
case VIR_NWFILTER_RULE_PROTOCOL_IPV6:
fwrule = virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain, NULL);
if (ebtablesHandleEthHdr(fw, fwrule,
vars,
&rule->p.ipv6HdrFilter.ethHdr,
reverse) < 0)
return -1;
virFirewallRuleAddArgList(fw, fwrule,
"-p", "ipv6", NULL);
if (HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.ipHdr.dataSrcIPAddr)) {
if (printDataType(vars,
ipv6addr, sizeof(ipv6addr),
&rule->p.ipv6HdrFilter.ipHdr.dataSrcIPAddr) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule,
reverse ? "--ip6-destination" : "--ip6-source");
if (ENTRY_WANT_NEG_SIGN(&rule->p.ipv6HdrFilter.ipHdr.dataSrcIPAddr))
virFirewallRuleAddArg(fw, fwrule, "!");
if (HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.ipHdr.dataSrcIPMask)) {
if (printDataType(vars,
number, sizeof(number),
&rule->p.ipv6HdrFilter.ipHdr.dataSrcIPMask) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s/%s", ipv6addr, number);
} else {
virFirewallRuleAddArg(fw, fwrule, ipv6addr);
}
}
if (HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.ipHdr.dataDstIPAddr)) {
if (printDataType(vars,
ipv6addr, sizeof(ipv6addr),
&rule->p.ipv6HdrFilter.ipHdr.dataDstIPAddr) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule,
reverse ? "--ip6-source" : "--ip6-destination");
if (ENTRY_WANT_NEG_SIGN(&rule->p.ipv6HdrFilter.ipHdr.dataDstIPAddr))
virFirewallRuleAddArg(fw, fwrule, "!");
if (HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.ipHdr.dataDstIPMask)) {
if (printDataType(vars,
number, sizeof(number),
&rule->p.ipv6HdrFilter.ipHdr.dataDstIPMask) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s/%s", ipv6addr, number);
} else {
virFirewallRuleAddArg(fw, fwrule, ipv6addr);
}
}
if (HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.ipHdr.dataProtocolID)) {
if (printDataType(vars,
number, sizeof(number),
&rule->p.ipv6HdrFilter.ipHdr.dataProtocolID) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule, "--ip6-protocol");
if (ENTRY_WANT_NEG_SIGN(&rule->p.ipv6HdrFilter.ipHdr.dataProtocolID))
virFirewallRuleAddArg(fw, fwrule, "!");
virFirewallRuleAddArg(fw, fwrule, number);
}
if (HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.portData.dataSrcPortStart)) {
if (printDataType(vars,
number, sizeof(number),
&rule->p.ipv6HdrFilter.portData.dataSrcPortStart) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule,
reverse ? "--ip6-destination-port" : "--ip6-source-port");
if (ENTRY_WANT_NEG_SIGN(&rule->p.ipv6HdrFilter.portData.dataSrcPortStart))
virFirewallRuleAddArg(fw, fwrule, "!");
if (HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.portData.dataSrcPortEnd)) {
if (printDataType(vars,
numberalt, sizeof(numberalt),
&rule->p.ipv6HdrFilter.portData.dataSrcPortEnd) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s:%s", number, numberalt);
} else {
virFirewallRuleAddArg(fw, fwrule, number);
}
}
if (HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.portData.dataDstPortStart)) {
if (printDataType(vars,
number, sizeof(number),
&rule->p.ipv6HdrFilter.portData.dataDstPortStart) < 0)
return -1;
virFirewallRuleAddArg(fw, fwrule,
reverse ? "--ip6-source-port" : "--ip6-destination-port");
if (ENTRY_WANT_NEG_SIGN(&rule->p.ipv6HdrFilter.portData.dataDstPortStart))
virFirewallRuleAddArg(fw, fwrule, "!");
if (HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.portData.dataDstPortEnd)) {
if (printDataType(vars,
numberalt, sizeof(numberalt),
&rule->p.ipv6HdrFilter.portData.dataDstPortEnd) < 0)
return -1;
virFirewallRuleAddArgFormat(fw, fwrule,
"%s:%s", number, numberalt);
} else {
virFirewallRuleAddArg(fw, fwrule, number);
}
}
if (HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.dataICMPTypeStart) ||
HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.dataICMPTypeEnd) ||
HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.dataICMPCodeStart) ||
HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.dataICMPCodeEnd)) {
bool lo = false;
g_auto(virBuffer) buf = VIR_BUFFER_INITIALIZER;
g_autofree char *r = NULL;
virFirewallRuleAddArg(fw, fwrule,
"--ip6-icmp-type");
if (HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.dataICMPTypeStart)) {
if (printDataType(vars,
number, sizeof(number),
&rule->p.ipv6HdrFilter.dataICMPTypeStart) < 0)
return -1;
lo = true;
} else {
ignore_value(virStrcpyStatic(number, "0"));
}
virBufferStrcat(&buf, number, ":", NULL);
if (HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.dataICMPTypeEnd)) {
if (printDataType(vars,
numberalt, sizeof(numberalt),
&rule->p.ipv6HdrFilter.dataICMPTypeEnd) < 0)
return -1;
} else {
if (lo)
ignore_value(virStrcpyStatic(numberalt, number));
else
ignore_value(virStrcpyStatic(numberalt, "255"));
}
virBufferStrcat(&buf, numberalt, "/", NULL);
lo = false;
if (HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.dataICMPCodeStart)) {
if (printDataType(vars,
number, sizeof(number),
&rule->p.ipv6HdrFilter.dataICMPCodeStart) < 0)
return -1;
lo = true;
} else {
ignore_value(virStrcpyStatic(number, "0"));
}
virBufferStrcat(&buf, number, ":", NULL);
if (HAS_ENTRY_ITEM(&rule->p.ipv6HdrFilter.dataICMPCodeEnd)) {
if (printDataType(vars,
numberalt, sizeof(numberalt),
&rule->p.ipv6HdrFilter.dataICMPCodeEnd) < 0)
return -1;
} else {
if (lo)
ignore_value(virStrcpyStatic(numberalt, number));
else
ignore_value(virStrcpyStatic(numberalt, "255"));
}
virBufferStrcat(&buf, numberalt, NULL);
if (ENTRY_WANT_NEG_SIGN(&rule->p.ipv6HdrFilter.dataICMPTypeStart))
virFirewallRuleAddArg(fw, fwrule, "!");
r = virBufferContentAndReset(&buf);
virFirewallRuleAddArg(fw, fwrule, r);
}
break;
case VIR_NWFILTER_RULE_PROTOCOL_NONE:
fwrule = virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain, NULL);
break;
default:
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unexpected rule protocol %1$d"),
rule->prtclType);
return -1;
}
switch (rule->action) {
case VIR_NWFILTER_RULE_ACTION_REJECT:
/* REJECT not supported */
target = virNWFilterJumpTargetTypeToString(
VIR_NWFILTER_RULE_ACTION_DROP);
break;
default:
target = virNWFilterJumpTargetTypeToString(rule->action);
}
virFirewallRuleAddArgList(fw, fwrule,
"-j", target, NULL);
#undef INST_ITEM_RANGE
#undef INST_ITEM_MASK
#undef INST_ITEM_2PARMS
#undef INST_ITEM
return 0;
}
/*
* ebiptablesCreateRuleInstance:
* @chainPriority : The priority of the chain
* @chainSuffix: The suffix to put on the end of the name of the chain
* @rule: The rule of the filter to convert
* @ifname : The name of the interface to apply the rule to
* @vars : A map containing the variables to resolve
* @res : The data structure to store the result(s) into
*
* Convert a single rule into its representation for later instantiation
*
* Returns 0 in case of success with the result stored in the data structure
* pointed to by res, -1 otherwise
*/
static int
ebiptablesCreateRuleInstance(virFirewall *fw,
const char *chainSuffix,
virNWFilterRuleDef *rule,
const char *ifname,
virNWFilterVarCombIter *vars)
{
if (virNWFilterRuleIsProtocolEthernet(rule)) {
if (rule->tt == VIR_NWFILTER_RULE_DIRECTION_OUT ||
rule->tt == VIR_NWFILTER_RULE_DIRECTION_INOUT) {
if (ebtablesCreateRuleInstance(fw,
CHAINPREFIX_HOST_IN_TEMP,
chainSuffix,
rule,
ifname,
vars,
rule->tt == VIR_NWFILTER_RULE_DIRECTION_INOUT) < 0)
return -1;
}
if (rule->tt == VIR_NWFILTER_RULE_DIRECTION_IN ||
rule->tt == VIR_NWFILTER_RULE_DIRECTION_INOUT) {
if (ebtablesCreateRuleInstance(fw,
CHAINPREFIX_HOST_OUT_TEMP,
chainSuffix,
rule,
ifname,
vars,
false) < 0)
return -1;
}
} else {
virFirewallLayer layer;
if (virNWFilterRuleIsProtocolIPv6(rule)) {
layer = VIR_FIREWALL_LAYER_IPV6;
} else if (virNWFilterRuleIsProtocolIPv4(rule)) {
layer = VIR_FIREWALL_LAYER_IPV4;
} else {
virReportError(VIR_ERR_OPERATION_FAILED,
"%s", _("unexpected protocol type"));
return -1;
}
if (iptablesCreateRuleInstance(fw,
layer,
rule,
ifname,
vars) < 0)
return -1;
}
return 0;
}
static void
ebtablesCreateTmpRootChainFW(virFirewall *fw,
int incoming, const char *ifname)
{
char chain[MAX_CHAINNAME_LENGTH];
char chainPrefix = (incoming) ? CHAINPREFIX_HOST_IN_TEMP
: CHAINPREFIX_HOST_OUT_TEMP;
PRINT_ROOT_CHAIN(chain, chainPrefix, ifname);
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-N", chain, NULL);
}
static void
ebtablesLinkTmpRootChainFW(virFirewall *fw,
int incoming, const char *ifname)
{
char chain[MAX_CHAINNAME_LENGTH];
char chainPrefix = incoming ? CHAINPREFIX_HOST_IN_TEMP
: CHAINPREFIX_HOST_OUT_TEMP;
PRINT_ROOT_CHAIN(chain, chainPrefix, ifname);
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A",
incoming ? EBTABLES_CHAIN_INCOMING : EBTABLES_CHAIN_OUTGOING,
incoming ? "-i" : "-o",
ifname, "-j", chain, NULL);
}
static void
_ebtablesRemoveRootChainFW(virFirewall *fw,
bool incoming, const char *ifname,
int isTempChain)
{
char chain[MAX_CHAINNAME_LENGTH];
char chainPrefix;
if (isTempChain)
chainPrefix = incoming ? CHAINPREFIX_HOST_IN_TEMP
: CHAINPREFIX_HOST_OUT_TEMP;
else
chainPrefix = incoming ? CHAINPREFIX_HOST_IN
: CHAINPREFIX_HOST_OUT;
PRINT_ROOT_CHAIN(chain, chainPrefix, ifname);
virFirewallAddRuleFull(fw, VIR_FIREWALL_LAYER_ETHERNET,
true, NULL, NULL,
"-t", "nat", "-F", chain, NULL);
virFirewallAddRuleFull(fw, VIR_FIREWALL_LAYER_ETHERNET,
true, NULL, NULL,
"-t", "nat", "-X", chain, NULL);
}
static void
ebtablesRemoveRootChainFW(virFirewall *fw,
bool incoming, const char *ifname)
{
_ebtablesRemoveRootChainFW(fw, incoming, ifname, false);
}
static void
ebtablesRemoveTmpRootChainFW(virFirewall *fw,
bool incoming, const char *ifname)
{
_ebtablesRemoveRootChainFW(fw, incoming, ifname, 1);
}
static void
_ebtablesUnlinkRootChainFW(virFirewall *fw,
bool incoming, const char *ifname,
int isTempChain)
{
char chain[MAX_CHAINNAME_LENGTH];
char chainPrefix;
if (isTempChain) {
chainPrefix = incoming ? CHAINPREFIX_HOST_IN_TEMP
: CHAINPREFIX_HOST_OUT_TEMP;
} else {
chainPrefix = incoming ? CHAINPREFIX_HOST_IN
: CHAINPREFIX_HOST_OUT;
}
PRINT_ROOT_CHAIN(chain, chainPrefix, ifname);
virFirewallAddRuleFull(fw, VIR_FIREWALL_LAYER_ETHERNET,
true, NULL, NULL,
"-t", "nat", "-D",
incoming ? EBTABLES_CHAIN_INCOMING : EBTABLES_CHAIN_OUTGOING,
incoming ? "-i" : "-o",
ifname, "-j", chain, NULL);
}
static void
ebtablesUnlinkRootChainFW(virFirewall *fw,
bool incoming, const char *ifname)
{
_ebtablesUnlinkRootChainFW(fw, incoming, ifname, false);
}
static void
ebtablesUnlinkTmpRootChainFW(virFirewall *fw,
int incoming, const char *ifname)
{
_ebtablesUnlinkRootChainFW(fw, incoming, ifname, 1);
}
static void
ebtablesCreateTmpSubChainFW(virFirewall *fw,
bool incoming,
const char *ifname,
enum l3_proto_idx protoidx,
const char *filtername)
{
char rootchain[MAX_CHAINNAME_LENGTH], chain[MAX_CHAINNAME_LENGTH];
char chainPrefix = incoming ? CHAINPREFIX_HOST_IN_TEMP
: CHAINPREFIX_HOST_OUT_TEMP;
virFirewallRule *fwrule;
PRINT_ROOT_CHAIN(rootchain, chainPrefix, ifname);
PRINT_CHAIN(chain, chainPrefix, ifname,
(filtername) ? filtername : l3_protocols[protoidx].val);
virFirewallAddRuleFull(fw, VIR_FIREWALL_LAYER_ETHERNET,
true, NULL, NULL,
"-t", "nat", "-F", chain, NULL);
virFirewallAddRuleFull(fw, VIR_FIREWALL_LAYER_ETHERNET,
true, NULL, NULL,
"-t", "nat", "-X", chain, NULL);
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-N", chain, NULL);
fwrule = virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", rootchain, NULL);
switch ((int)protoidx) {
case L2_PROTO_MAC_IDX:
break;
case L2_PROTO_STP_IDX:
virFirewallRuleAddArgList(fw, fwrule,
"-d", NWFILTER_MAC_BGA, NULL);
break;
default:
virFirewallRuleAddArg(fw, fwrule, "-p");
virFirewallRuleAddArgFormat(fw, fwrule,
"0x%04x",
l3_protocols[protoidx].attr);
break;
}
virFirewallRuleAddArgList(fw, fwrule,
"-j", chain, NULL);
}
static int
ebtablesRemoveSubChainsQuery(virFirewall *fw,
virFirewallLayer layer,
const char *const *lines,
void *opaque)
{
size_t i, j;
const char *chainprefixes = opaque;
for (i = 0; lines[i] != NULL; i++) {
char *tmp = strstr(lines[i], "-j ");
VIR_DEBUG("Considering '%s'", lines[i]);
if (!tmp)
continue;
tmp = tmp + 3;
for (j = 0; chainprefixes[j]; j++) {
if (tmp[0] == chainprefixes[j] &&
tmp[1] == '-') {
VIR_DEBUG("Processing chain '%s'", tmp);
virFirewallAddRuleFull(fw, layer,
false, ebtablesRemoveSubChainsQuery,
(void *)chainprefixes,
"-t", "nat", "-L", tmp, NULL);
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-t", "nat", "-F", tmp, NULL);
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-t", "nat", "-X", tmp, NULL);
}
}
}
return 0;
}
static void
_ebtablesRemoveSubChainsFW(virFirewall *fw,
const char *ifname,
const char *chainprefixes)
{
char rootchain[MAX_CHAINNAME_LENGTH];
size_t i;
for (i = 0; chainprefixes[i] != 0; i++) {
PRINT_ROOT_CHAIN(rootchain, chainprefixes[i], ifname);
virFirewallAddRuleFull(fw, VIR_FIREWALL_LAYER_ETHERNET,
false, ebtablesRemoveSubChainsQuery,
(void *)chainprefixes,
"-t", "nat", "-L", rootchain, NULL);
}
}
static void
ebtablesRemoveSubChainsFW(virFirewall *fw,
const char *ifname)
{
_ebtablesRemoveSubChainsFW(fw, ifname, chainprefixes_host);
}
static void
ebtablesRemoveTmpSubChainsFW(virFirewall *fw,
const char *ifname)
{
_ebtablesRemoveSubChainsFW(fw, ifname, chainprefixes_host_temp);
}
static void
ebtablesRenameTmpSubChainFW(virFirewall *fw,
int incoming,
const char *ifname,
const char *protocol)
{
char tmpchain[MAX_CHAINNAME_LENGTH], chain[MAX_CHAINNAME_LENGTH];
char tmpChainPrefix = (incoming) ? CHAINPREFIX_HOST_IN_TEMP
: CHAINPREFIX_HOST_OUT_TEMP;
char chainPrefix = (incoming) ? CHAINPREFIX_HOST_IN
: CHAINPREFIX_HOST_OUT;
if (protocol) {
PRINT_CHAIN(tmpchain, tmpChainPrefix, ifname, protocol);
PRINT_CHAIN(chain, chainPrefix, ifname, protocol);
} else {
PRINT_ROOT_CHAIN(tmpchain, tmpChainPrefix, ifname);
PRINT_ROOT_CHAIN(chain, chainPrefix, ifname);
}
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-E", tmpchain, chain, NULL);
}
static void
ebtablesRenameTmpRootChainFW(virFirewall *fw,
bool incoming,
const char *ifname)
{
ebtablesRenameTmpSubChainFW(fw, incoming, ifname, NULL);
}
static int
ebtablesRenameTmpSubAndRootChainsQuery(virFirewall *fw,
virFirewallLayer layer,
const char *const *lines,
void *opaque G_GNUC_UNUSED)
{
size_t i;
char newchain[MAX_CHAINNAME_LENGTH];
for (i = 0; lines[i] != NULL; i++) {
char *tmp = strstr(lines[i], "-j ");
VIR_DEBUG("Considering '%s'", lines[i]);
if (!tmp)
continue;
tmp = tmp + 3;
if (tmp[0] != CHAINPREFIX_HOST_IN_TEMP &&
tmp[0] != CHAINPREFIX_HOST_OUT_TEMP)
continue;
if (tmp[1] != '-')
continue;
ignore_value(virStrcpyStatic(newchain, tmp));
if (newchain[0] == CHAINPREFIX_HOST_IN_TEMP)
newchain[0] = CHAINPREFIX_HOST_IN;
else
newchain[0] = CHAINPREFIX_HOST_OUT;
VIR_DEBUG("Renaming chain '%s' to '%s'", tmp, newchain);
virFirewallAddRuleFull(fw, layer,
false, ebtablesRenameTmpSubAndRootChainsQuery,
NULL,
"-t", "nat", "-L", tmp, NULL);
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-t", "nat", "-F", newchain, NULL);
virFirewallAddRuleFull(fw, layer,
true, NULL, NULL,
"-t", "nat", "-X", newchain, NULL);
virFirewallAddRule(fw, layer,
"-t", "nat", "-E", tmp, newchain, NULL);
}
return 0;
}
static void
ebtablesRenameTmpSubAndRootChainsFW(virFirewall *fw,
const char *ifname)
{
char rootchain[MAX_CHAINNAME_LENGTH];
size_t i;
char chains[3] = {
CHAINPREFIX_HOST_IN_TEMP,
CHAINPREFIX_HOST_OUT_TEMP,
0
};
for (i = 0; chains[i] != 0; i++) {
PRINT_ROOT_CHAIN(rootchain, chains[i], ifname);
virFirewallAddRuleFull(fw, VIR_FIREWALL_LAYER_ETHERNET,
false, ebtablesRenameTmpSubAndRootChainsQuery,
NULL,
"-t", "nat", "-L", rootchain, NULL);
}
ebtablesRenameTmpRootChainFW(fw, true, ifname);
ebtablesRenameTmpRootChainFW(fw, false, ifname);
}
/**
* ebiptablesCanApplyBasicRules
*
* Determine whether this driver can apply the basic rules, meaning
* run ebtablesApplyBasicRules and ebtablesApplyDHCPOnlyRules.
* In case of this driver we need the ebtables tool available.
*/
static int
ebiptablesCanApplyBasicRules(void)
{
return true;
}
/**
* ebtablesApplyBasicRules
*
* @ifname: name of the backend-interface to which to apply the rules
* @macaddr: MAC address the VM is using in packets sent through the
* interface
*
* Returns 0 on success, -1 on failure with the rules removed
*
* Apply basic filtering rules on the given interface
* - filtering for MAC address spoofing
* - allowing IPv4 & ARP traffic
*/
static int
ebtablesApplyBasicRules(const char *ifname,
const virMacAddr *macaddr)
{
g_autoptr(virFirewall) fw = virFirewallNew();
char chain[MAX_CHAINNAME_LENGTH];
char chainPrefix = CHAINPREFIX_HOST_IN_TEMP;
char macaddr_str[VIR_MAC_STRING_BUFLEN];
virMacAddrFormat(macaddr, macaddr_str);
if (ebiptablesAllTeardown(ifname) < 0)
return -1;
virFirewallStartTransaction(fw, 0);
ebtablesCreateTmpRootChainFW(fw, true, ifname);
PRINT_ROOT_CHAIN(chain, chainPrefix, ifname);
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain,
"-s", "!", macaddr_str,
"-j", "DROP", NULL);
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain,
"-p", "IPv4",
"-j", "ACCEPT", NULL);
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain,
"-p", "ARP",
"-j", "ACCEPT", NULL);
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain,
"-j", "DROP", NULL);
ebtablesLinkTmpRootChainFW(fw, true, ifname);
ebtablesRenameTmpRootChainFW(fw, true, ifname);
if (virFirewallApply(fw) < 0)
goto error;
return 0;
error:
ebtablesCleanAll(ifname);
return -1;
}
/**
* ebtablesApplyDHCPOnlyRules
*
* @ifname: name of the backend-interface to which to apply the rules
* @macaddr: MAC address the VM is using in packets sent through the
* interface
* @dhcpsrvrs: The DHCP server(s) from which the VM may receive traffic
* from; may be NULL
* @leaveTemporary: Whether to leave the table names with their temporary
* names (true) or also perform the renaming to their final names as
* part of this call (false)
*
* Returns 0 on success, -1 on failure with the rules removed
*
* Apply filtering rules so that the VM can only send and receive
* DHCP traffic and nothing else.
*/
static int
ebtablesApplyDHCPOnlyRules(const char *ifname,
const virMacAddr *macaddr,
virNWFilterVarValue *dhcpsrvrs,
bool leaveTemporary)
{
char chain_in [MAX_CHAINNAME_LENGTH],
chain_out[MAX_CHAINNAME_LENGTH];
char macaddr_str[VIR_MAC_STRING_BUFLEN];
unsigned int idx = 0;
unsigned int num_dhcpsrvrs;
g_autoptr(virFirewall) fw = virFirewallNew();
virMacAddrFormat(macaddr, macaddr_str);
if (ebiptablesAllTeardown(ifname) < 0)
return -1;
virFirewallStartTransaction(fw, 0);
ebtablesCreateTmpRootChainFW(fw, true, ifname);
ebtablesCreateTmpRootChainFW(fw, false, ifname);
PRINT_ROOT_CHAIN(chain_in, CHAINPREFIX_HOST_IN_TEMP, ifname);
PRINT_ROOT_CHAIN(chain_out, CHAINPREFIX_HOST_OUT_TEMP, ifname);
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain_in,
"-s", macaddr_str,
"-p", "ipv4", "--ip-protocol", "udp",
"--ip-sport", "68", "--ip-dport", "67",
"-j", "ACCEPT", NULL);
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain_in,
"-j", "DROP", NULL);
num_dhcpsrvrs = (dhcpsrvrs != NULL)
? virNWFilterVarValueGetCardinality(dhcpsrvrs)
: 0;
while (true) {
const char *dhcpserver = NULL;
int ctr;
if (idx < num_dhcpsrvrs)
dhcpserver = virNWFilterVarValueGetNthValue(dhcpsrvrs, idx);
/*
* create two rules allowing response to MAC address of VM
* or to broadcast MAC address
*/
for (ctr = 0; ctr < 2; ctr++) {
if (dhcpserver)
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain_out,
"-d", (ctr == 0) ? macaddr_str : "ff:ff:ff:ff:ff:ff",
"-p", "ipv4", "--ip-protocol", "udp",
"--ip-src", dhcpserver,
"--ip-sport", "67", "--ip-dport", "68",
"-j", "ACCEPT", NULL);
else
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain_out,
"-d", (ctr == 0) ? macaddr_str : "ff:ff:ff:ff:ff:ff",
"-p", "ipv4", "--ip-protocol", "udp",
"--ip-sport", "67", "--ip-dport", "68",
"-j", "ACCEPT", NULL);
}
idx++;
if (idx >= num_dhcpsrvrs)
break;
}
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain_out,
"-j", "DROP", NULL);
ebtablesLinkTmpRootChainFW(fw, true, ifname);
ebtablesLinkTmpRootChainFW(fw, false, ifname);
if (!leaveTemporary) {
ebtablesRenameTmpRootChainFW(fw, true, ifname);
ebtablesRenameTmpRootChainFW(fw, false, ifname);
}
if (virFirewallApply(fw) < 0)
goto error;
return 0;
error:
ebtablesCleanAll(ifname);
return -1;
}
/**
* ebtablesApplyDropAllRules
*
* @ifname: name of the backend-interface to which to apply the rules
*
* Returns 0 on success, -1 on failure with the rules removed
*
* Apply filtering rules so that the VM cannot receive or send traffic.
*/
static int
ebtablesApplyDropAllRules(const char *ifname)
{
char chain_in [MAX_CHAINNAME_LENGTH],
chain_out[MAX_CHAINNAME_LENGTH];
g_autoptr(virFirewall) fw = virFirewallNew();
if (ebiptablesAllTeardown(ifname) < 0)
return -1;
virFirewallStartTransaction(fw, 0);
ebtablesCreateTmpRootChainFW(fw, true, ifname);
ebtablesCreateTmpRootChainFW(fw, false, ifname);
PRINT_ROOT_CHAIN(chain_in, CHAINPREFIX_HOST_IN_TEMP, ifname);
PRINT_ROOT_CHAIN(chain_out, CHAINPREFIX_HOST_OUT_TEMP, ifname);
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain_in,
"-j", "DROP", NULL);
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-t", "nat", "-A", chain_out,
"-j", "DROP", NULL);
ebtablesLinkTmpRootChainFW(fw, true, ifname);
ebtablesLinkTmpRootChainFW(fw, false, ifname);
ebtablesRenameTmpRootChainFW(fw, true, ifname);
ebtablesRenameTmpRootChainFW(fw, false, ifname);
if (virFirewallApply(fw) < 0)
goto error;
return 0;
error:
ebtablesCleanAll(ifname);
return -1;
}
static int
ebtablesRemoveBasicRules(const char *ifname)
{
return ebtablesCleanAll(ifname);
}
static int
ebtablesCleanAll(const char *ifname)
{
g_autoptr(virFirewall) fw = virFirewallNew();
virFirewallStartTransaction(fw, VIR_FIREWALL_TRANSACTION_IGNORE_ERRORS);
ebtablesUnlinkRootChainFW(fw, true, ifname);
ebtablesUnlinkRootChainFW(fw, false, ifname);
ebtablesRemoveSubChainsFW(fw, ifname);
ebtablesRemoveRootChainFW(fw, true, ifname);
ebtablesRemoveRootChainFW(fw, false, ifname);
ebtablesUnlinkTmpRootChainFW(fw, true, ifname);
ebtablesUnlinkTmpRootChainFW(fw, false, ifname);
ebtablesRemoveTmpSubChainsFW(fw, ifname);
ebtablesRemoveTmpRootChainFW(fw, true, ifname);
ebtablesRemoveTmpRootChainFW(fw, false, ifname);
return virFirewallApply(fw);
}
static int
virNWFilterRuleInstSort(const void *a, const void *b)
{
const virNWFilterRuleInst *insta = a;
const virNWFilterRuleInst *instb = b;
const char *root = virNWFilterChainSuffixTypeToString(
VIR_NWFILTER_CHAINSUFFIX_ROOT);
bool root_a = STREQ(insta->chainSuffix, root);
bool root_b = STREQ(instb->chainSuffix, root);
/* ensure root chain commands appear before all others since
we will need them to create the child chains */
if (root_a) {
if (!root_b)
return -1; /* a before b */
} else if (root_b) {
return 1; /* b before a */
}
/* priorities are limited to range [-1000, 1000] */
return insta->priority - instb->priority;
}
static int
virNWFilterRuleInstSortPtr(const void *a, const void *b)
{
virNWFilterRuleInst * const *insta = a;
virNWFilterRuleInst * const *instb = b;
return virNWFilterRuleInstSort(*insta, *instb);
}
static int
ebiptablesFilterOrderSort(const void *va,
const void *vb)
{
const virHashKeyValuePair *a = va;
const virHashKeyValuePair *b = vb;
/* elements' values has been limited to range [-1000, 1000] */
return *(virNWFilterChainPriority *)a->value -
*(virNWFilterChainPriority *)b->value;
}
static void
iptablesCheckBridgeNFCallEnabled(bool isIPv6)
{
static time_t lastReport, lastReportIPv6;
const char *pathname = NULL;
char buffer[1];
time_t now = time(NULL);
if (isIPv6 &&
(now - lastReportIPv6) > BRIDGE_NF_CALL_ALERT_INTERVAL) {
pathname = PROC_BRIDGE_NF_CALL_IP6TABLES;
} else if (now - lastReport > BRIDGE_NF_CALL_ALERT_INTERVAL) {
pathname = PROC_BRIDGE_NF_CALL_IPTABLES;
}
if (pathname) {
int fd = open(pathname, O_RDONLY);
if (fd >= 0) {
if (read(fd, buffer, 1) == 1) {
if (buffer[0] == '0') {
char msg[256];
g_snprintf(msg, sizeof(msg),
_("To enable ip%1$stables filtering for the VM do 'echo 1 > %2$s'"),
isIPv6 ? "6" : "",
pathname);
VIR_WARN("%s", msg);
if (isIPv6)
lastReportIPv6 = now;
else
lastReport = now;
}
}
VIR_FORCE_CLOSE(fd);
}
}
}
/*
* Given a filtername determine the protocol it is used for evaluating
* We do prefix-matching to determine the protocol.
*/
static enum l3_proto_idx
ebtablesGetProtoIdxByFiltername(const char *filtername)
{
enum l3_proto_idx idx;
for (idx = 0; idx < L3_PROTO_LAST_IDX; idx++) {
if (STRPREFIX(filtername, l3_protocols[idx].val))
return idx;
}
return -1;
}
static int
iptablesRuleInstCommand(virFirewall *fw,
const char *ifname,
virNWFilterRuleInst *rule)
{
virNWFilterVarCombIter *vciter;
virNWFilterVarCombIter *tmp;
int ret = -1;
/* rule->vars holds all the variables names that this rule will access.
* iterate over all combinations of the variables' values and instantiate
* the filtering rule with each combination.
*/
tmp = vciter = virNWFilterVarCombIterCreate(rule->vars,
rule->def->varAccess,
rule->def->nVarAccess);
if (!vciter)
return -1;
do {
if (ebiptablesCreateRuleInstance(fw,
rule->chainSuffix,
rule->def,
ifname,
tmp) < 0)
goto cleanup;
tmp = virNWFilterVarCombIterNext(tmp);
} while (tmp != NULL);
ret = 0;
cleanup:
virNWFilterVarCombIterFree(vciter);
return ret;
}
static int
ebtablesRuleInstCommand(virFirewall *fw,
const char *ifname,
virNWFilterRuleInst *rule)
{
virNWFilterVarCombIter *vciter;
virNWFilterVarCombIter *tmp;
int ret = -1;
/* rule->vars holds all the variables names that this rule will access.
* iterate over all combinations of the variables' values and instantiate
* the filtering rule with each combination.
*/
tmp = vciter = virNWFilterVarCombIterCreate(rule->vars,
rule->def->varAccess,
rule->def->nVarAccess);
if (!vciter)
return -1;
do {
if (ebiptablesCreateRuleInstance(fw,
rule->chainSuffix,
rule->def,
ifname,
tmp) < 0)
goto cleanup;
tmp = virNWFilterVarCombIterNext(tmp);
} while (tmp != NULL);
ret = 0;
cleanup:
virNWFilterVarCombIterFree(vciter);
return ret;
}
typedef struct _ebtablesSubChainInst ebtablesSubChainInst;
struct _ebtablesSubChainInst {
virNWFilterChainPriority priority;
bool incoming;
enum l3_proto_idx protoidx;
const char *filtername;
};
static int
ebtablesSubChainInstSort(const void *a, const void *b)
{
const ebtablesSubChainInst **insta = (const ebtablesSubChainInst **)a;
const ebtablesSubChainInst **instb = (const ebtablesSubChainInst **)b;
/* priorities are limited to range [-1000, 1000] */
return (*insta)->priority - (*instb)->priority;
}
static int
ebtablesGetSubChainInsts(GHashTable *chains,
bool incoming,
ebtablesSubChainInst ***insts,
size_t *ninsts)
{
g_autofree virHashKeyValuePair *filter_names = NULL;
size_t nfilter_names;
size_t i;
filter_names = virHashGetItems(chains, &nfilter_names, false);
if (filter_names == NULL)
return -1;
qsort(filter_names, nfilter_names, sizeof(*filter_names), ebiptablesFilterOrderSort);
for (i = 0; filter_names[i].key; i++) {
g_autofree ebtablesSubChainInst *inst = NULL;
enum l3_proto_idx idx = ebtablesGetProtoIdxByFiltername(
filter_names[i].key);
if ((int)idx < 0)
continue;
inst = g_new0(ebtablesSubChainInst, 1);
inst->priority = *(const virNWFilterChainPriority *)filter_names[i].value;
inst->incoming = incoming;
inst->protoidx = idx;
inst->filtername = filter_names[i].key;
VIR_APPEND_ELEMENT(*insts, *ninsts, inst);
}
return 0;
}
static int
ebiptablesApplyNewRules(const char *ifname,
virNWFilterRuleInst **rules,
size_t nrules)
{
size_t i, j;
g_autoptr(virFirewall) fw = virFirewallNew();
g_autoptr(GHashTable) chains_in_set = virHashNew(NULL);
g_autoptr(GHashTable) chains_out_set = virHashNew(NULL);
bool haveEbtables = false;
bool haveIptables = false;
bool haveIp6tables = false;
g_autofree ebtablesSubChainInst **subchains = NULL;
size_t nsubchains = 0;
int ret = -1;
if (nrules)
qsort(rules, nrules, sizeof(rules[0]),
virNWFilterRuleInstSortPtr);
/* cleanup whatever may exist */
virFirewallStartTransaction(fw, VIR_FIREWALL_TRANSACTION_IGNORE_ERRORS);
ebtablesUnlinkTmpRootChainFW(fw, true, ifname);
ebtablesUnlinkTmpRootChainFW(fw, false, ifname);
ebtablesRemoveTmpSubChainsFW(fw, ifname);
ebtablesRemoveTmpRootChainFW(fw, true, ifname);
ebtablesRemoveTmpRootChainFW(fw, false, ifname);
virFirewallStartTransaction(fw, 0);
/* walk the list of rules and increase the priority
* of rules in case the chain priority is of higher value;
* this preserves the order of the rules and ensures that
* the chain will be created before the chain's rules
* are created; don't adjust rules in the root chain
* example: a rule of priority -510 will be adjusted to
* priority -500 and the chain with priority -500 will
* then be created before it.
*/
for (i = 0; i < nrules; i++) {
if (rules[i]->chainPriority > rules[i]->priority &&
!strstr("root", rules[i]->chainSuffix)) {
rules[i]->priority = rules[i]->chainPriority;
}
}
for (i = 0; i < nrules; i++) {
if (virNWFilterRuleIsProtocolEthernet(rules[i]->def)) {
haveEbtables = true;
} else {
if (virNWFilterRuleIsProtocolIPv4(rules[i]->def))
haveIptables = true;
else if (virNWFilterRuleIsProtocolIPv6(rules[i]->def))
haveIp6tables = true;
}
}
/* process ebtables commands; interleave commands from filters with
commands for creating and connecting ebtables chains */
if (haveEbtables) {
/* scan the rules to see which chains need to be created */
for (i = 0; i < nrules; i++) {
if (virNWFilterRuleIsProtocolEthernet(rules[i]->def)) {
const char *name = rules[i]->chainSuffix;
if (rules[i]->def->tt == VIR_NWFILTER_RULE_DIRECTION_OUT ||
rules[i]->def->tt == VIR_NWFILTER_RULE_DIRECTION_INOUT) {
if (virHashUpdateEntry(chains_in_set, name,
&rules[i]->chainPriority) < 0)
goto cleanup;
}
if (rules[i]->def->tt == VIR_NWFILTER_RULE_DIRECTION_IN ||
rules[i]->def->tt == VIR_NWFILTER_RULE_DIRECTION_INOUT) {
if (virHashUpdateEntry(chains_out_set, name,
&rules[i]->chainPriority) < 0)
goto cleanup;
}
}
}
/* create needed chains */
if (virHashSize(chains_in_set) > 0) {
ebtablesCreateTmpRootChainFW(fw, true, ifname);
if (ebtablesGetSubChainInsts(chains_in_set,
true,
&subchains,
&nsubchains) < 0)
goto cleanup;
}
if (virHashSize(chains_out_set) > 0) {
ebtablesCreateTmpRootChainFW(fw, false, ifname);
if (ebtablesGetSubChainInsts(chains_out_set,
false,
&subchains,
&nsubchains) < 0)
goto cleanup;
}
if (nsubchains > 0)
qsort(subchains, nsubchains, sizeof(subchains[0]),
ebtablesSubChainInstSort);
for (i = 0, j = 0; i < nrules; i++) {
if (virNWFilterRuleIsProtocolEthernet(rules[i]->def)) {
while (j < nsubchains &&
subchains[j]->priority <= rules[i]->priority) {
ebtablesCreateTmpSubChainFW(fw,
subchains[j]->incoming,
ifname,
subchains[j]->protoidx,
subchains[j]->filtername);
j++;
}
if (ebtablesRuleInstCommand(fw,
ifname,
rules[i]) < 0)
goto cleanup;
}
}
while (j < nsubchains) {
ebtablesCreateTmpSubChainFW(fw,
subchains[j]->incoming,
ifname,
subchains[j]->protoidx,
subchains[j]->filtername);
j++;
}
}
if (haveIptables) {
iptablesUnlinkTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV4, ifname);
iptablesRemoveTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV4, ifname);
iptablesCreateBaseChainsFW(fw, VIR_FIREWALL_LAYER_IPV4);
iptablesCreateTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV4, ifname);
iptablesLinkTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV4, ifname);
iptablesSetupVirtInPostFW(fw, VIR_FIREWALL_LAYER_IPV4, ifname);
for (i = 0; i < nrules; i++) {
if (virNWFilterRuleIsProtocolIPv4(rules[i]->def)) {
if (iptablesRuleInstCommand(fw,
ifname,
rules[i]) < 0)
goto cleanup;
}
}
iptablesCheckBridgeNFCallEnabled(false);
}
if (haveIp6tables) {
iptablesUnlinkTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV6, ifname);
iptablesRemoveTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV6, ifname);
iptablesCreateBaseChainsFW(fw, VIR_FIREWALL_LAYER_IPV6);
iptablesCreateTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV6, ifname);
iptablesLinkTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV6, ifname);
iptablesSetupVirtInPostFW(fw, VIR_FIREWALL_LAYER_IPV6, ifname);
for (i = 0; i < nrules; i++) {
if (virNWFilterRuleIsProtocolIPv6(rules[i]->def)) {
if (iptablesRuleInstCommand(fw,
ifname,
rules[i]) < 0)
goto cleanup;
}
}
iptablesCheckBridgeNFCallEnabled(true);
}
if (virHashSize(chains_in_set) != 0)
ebtablesLinkTmpRootChainFW(fw, true, ifname);
if (virHashSize(chains_out_set) != 0)
ebtablesLinkTmpRootChainFW(fw, false, ifname);
virFirewallStartRollback(fw, 0);
ebtablesUnlinkTmpRootChainFW(fw, true, ifname);
ebtablesUnlinkTmpRootChainFW(fw, false, ifname);
if (haveIp6tables) {
iptablesUnlinkTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV6, ifname);
iptablesRemoveTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV6, ifname);
}
if (haveIptables) {
iptablesUnlinkTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV4, ifname);
iptablesRemoveTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV4, ifname);
}
ebtablesRemoveTmpSubChainsFW(fw, ifname);
ebtablesRemoveTmpRootChainFW(fw, true, ifname);
ebtablesRemoveTmpRootChainFW(fw, false, ifname);
if (virFirewallApply(fw) < 0)
goto cleanup;
ret = 0;
cleanup:
for (i = 0; i < nsubchains; i++)
g_free(subchains[i]);
return ret;
}
static void
ebiptablesTearNewRulesFW(virFirewall *fw, const char *ifname)
{
iptablesUnlinkTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV4, ifname);
iptablesRemoveTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV4, ifname);
iptablesUnlinkTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV6, ifname);
iptablesRemoveTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV6, ifname);
ebtablesUnlinkTmpRootChainFW(fw, true, ifname);
ebtablesUnlinkTmpRootChainFW(fw, false, ifname);
ebtablesRemoveTmpSubChainsFW(fw, ifname);
ebtablesRemoveTmpRootChainFW(fw, true, ifname);
ebtablesRemoveTmpRootChainFW(fw, false, ifname);
}
static int
ebiptablesTearNewRules(const char *ifname)
{
g_autoptr(virFirewall) fw = virFirewallNew();
virFirewallStartTransaction(fw, VIR_FIREWALL_TRANSACTION_IGNORE_ERRORS);
ebiptablesTearNewRulesFW(fw, ifname);
return virFirewallApply(fw);
}
static int
ebiptablesTearOldRules(const char *ifname)
{
g_autoptr(virFirewall) fw = virFirewallNew();
virFirewallStartTransaction(fw, VIR_FIREWALL_TRANSACTION_IGNORE_ERRORS);
iptablesUnlinkRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV4, ifname);
iptablesRemoveRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV4, ifname);
iptablesRenameTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV4, ifname);
iptablesUnlinkRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV6, ifname);
iptablesRemoveRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV6, ifname);
iptablesRenameTmpRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV6, ifname);
ebtablesUnlinkRootChainFW(fw, true, ifname);
ebtablesUnlinkRootChainFW(fw, false, ifname);
ebtablesRemoveSubChainsFW(fw, ifname);
ebtablesRemoveRootChainFW(fw, true, ifname);
ebtablesRemoveRootChainFW(fw, false, ifname);
ebtablesRenameTmpSubAndRootChainsFW(fw, ifname);
return virFirewallApply(fw);
}
/**
* ebiptablesAllTeardown:
* @ifname : the name of the interface to which the rules apply
*
* Unconditionally remove all possible user defined tables and rules
* that were created for the given interface (ifname).
*
* Returns 0 on success, -1 on OOM
*/
static int
ebiptablesAllTeardown(const char *ifname)
{
g_autoptr(virFirewall) fw = virFirewallNew();
virFirewallStartTransaction(fw, VIR_FIREWALL_TRANSACTION_IGNORE_ERRORS);
ebiptablesTearNewRulesFW(fw, ifname);
iptablesUnlinkRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV4, ifname);
iptablesClearVirtInPostFW(fw, VIR_FIREWALL_LAYER_IPV4, ifname);
iptablesRemoveRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV4, ifname);
iptablesUnlinkRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV6, ifname);
iptablesClearVirtInPostFW(fw, VIR_FIREWALL_LAYER_IPV6, ifname);
iptablesRemoveRootChainsFW(fw, VIR_FIREWALL_LAYER_IPV6, ifname);
ebtablesUnlinkRootChainFW(fw, true, ifname);
ebtablesUnlinkRootChainFW(fw, false, ifname);
ebtablesRemoveSubChainsFW(fw, ifname);
ebtablesRemoveRootChainFW(fw, true, ifname);
ebtablesRemoveRootChainFW(fw, false, ifname);
return virFirewallApply(fw);
}
virNWFilterTechDriver ebiptables_driver = {
.name = EBIPTABLES_DRIVER_ID,
.flags = 0,
.init = ebiptablesDriverInit,
.shutdown = ebiptablesDriverShutdown,
.applyNewRules = ebiptablesApplyNewRules,
.tearNewRules = ebiptablesTearNewRules,
.tearOldRules = ebiptablesTearOldRules,
.allTeardown = ebiptablesAllTeardown,
.canApplyBasicRules = ebiptablesCanApplyBasicRules,
.applyBasicRules = ebtablesApplyBasicRules,
.applyDHCPOnlyRules = ebtablesApplyDHCPOnlyRules,
.applyDropAllRules = ebtablesApplyDropAllRules,
.removeBasicRules = ebtablesRemoveBasicRules,
};
static int
ebiptablesDriverInit(bool privileged)
{
if (!privileged)
return 0;
ebiptables_driver.flags = TECHDRV_FLAG_INITIALIZED;
return 0;
}
static void
ebiptablesDriverShutdown(void)
{
ebiptables_driver.flags = 0;
}
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