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/*
* virebtables.c: Helper APIs for managing ebtables
*
* Copyright (C) 2007-2014 Red Hat, Inc.
* Copyright (C) 2009 IBM Corp.
*
* 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 "internal.h"
#include "virebtables.h"
#include "virlog.h"
#include "virfirewall.h"
#define VIR_FROM_THIS VIR_FROM_NONE
VIR_LOG_INIT("util.ebtables");
struct _ebtablesContext
{
char *chain;
};
enum {
ADD = 0,
REMOVE,
};
/**
* ebtablesContextNew:
*
* Create a new ebtable context
*
* Returns a pointer to the new structure or NULL in case of error
*/
ebtablesContext *
ebtablesContextNew(const char *driver)
{
ebtablesContext *ctx = NULL;
ctx = g_new0(ebtablesContext, 1);
ctx->chain = g_strdup_printf("libvirt_%s_FORWARD", driver);
return ctx;
}
/**
* ebtablesContextFree:
* @ctx: pointer to the EB table context
*
* Free the resources associated with an EB table context
*/
void
ebtablesContextFree(ebtablesContext *ctx)
{
if (!ctx)
return;
g_free(ctx->chain);
g_free(ctx);
}
int
ebtablesAddForwardPolicyReject(ebtablesContext *ctx)
{
g_autoptr(virFirewall) fw = virFirewallNew();
virFirewallStartTransaction(fw, VIR_FIREWALL_TRANSACTION_IGNORE_ERRORS);
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"--new-chain", ctx->chain,
NULL);
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"--insert", "FORWARD",
"--jump", ctx->chain, NULL);
virFirewallStartTransaction(fw, 0);
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
"-P", ctx->chain, "DROP",
NULL);
return virFirewallApply(fw);
}
/*
* Allow all traffic destined to the bridge, with a valid network address
*/
static int
ebtablesForwardAllowIn(ebtablesContext *ctx,
const char *iface,
const char *macaddr,
int action)
{
g_autoptr(virFirewall) fw = virFirewallNew();
virFirewallStartTransaction(fw, 0);
virFirewallAddRule(fw, VIR_FIREWALL_LAYER_ETHERNET,
action == ADD ? "--insert" : "--delete",
ctx->chain,
"--in-interface", iface,
"--source", macaddr,
"--jump", "ACCEPT",
NULL);
return virFirewallApply(fw);
}
/**
* ebtablesAddForwardAllowIn:
* @ctx: pointer to the EB table context
* @iface: the output interface name
* @physdev: the physical input device or NULL
*
* Add rules to the EB table context to allow the traffic on
* @physdev device to be forwarded to interface @iface. This allows
* the inbound traffic on a bridge.
*
* Returns 0 in case of success or an error code otherwise
*/
int
ebtablesAddForwardAllowIn(ebtablesContext *ctx,
const char *iface,
const virMacAddr *mac)
{
char macaddr[VIR_MAC_STRING_BUFLEN];
virMacAddrFormat(mac, macaddr);
return ebtablesForwardAllowIn(ctx, iface, macaddr, ADD);
}
/**
* ebtablesRemoveForwardAllowIn:
* @ctx: pointer to the EB table context
* @iface: the output interface name
* @physdev: the physical input device or NULL
*
* Remove rules from the EB table context hence forbidding the traffic
* on the @physdev device to be forwarded to interface @iface. This
* stops the inbound traffic on a bridge.
*
* Returns 0 in case of success or an error code otherwise
*/
int
ebtablesRemoveForwardAllowIn(ebtablesContext *ctx,
const char *iface,
const virMacAddr *mac)
{
char macaddr[VIR_MAC_STRING_BUFLEN];
virMacAddrFormat(mac, macaddr);
return ebtablesForwardAllowIn(ctx, iface, macaddr, REMOVE);
}
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