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[libvirt] [RFC PATCH 1/3] add ebtables wrapper



This patch adds the files which implement the ebtables wrapper.

Signed-off-by: Gerhard Stenzel <gerhard stenzel de ibm com>
---

 src/util/ebtables.c |  982 +++++++++++++++++++++++++++++++++++++++++++++++++++
 src/util/ebtables.h |  134 +++++++
 2 files changed, 1116 insertions(+), 0 deletions(-)
 create mode 100644 src/util/ebtables.c
 create mode 100644 src/util/ebtables.h

diff --git a/src/util/ebtables.c b/src/util/ebtables.c
new file mode 100644
index 0000000..493b094
--- /dev/null
+++ b/src/util/ebtables.c
@@ -0,0 +1,982 @@
+/*
+ * Copyright (C) 2009 IBM Corp.
+ * Copyright (C) 2007-2009 Red Hat, Inc.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+ *
+ * based on iptables.c
+ * Authors:
+ *     Gerhard Stenzel <gerhard stenzel de ibm com>
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <errno.h>
+#include <limits.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#ifdef HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+
+#ifdef HAVE_PATHS_H
+#include <paths.h>
+#endif
+
+#include "internal.h"
+#include "ebtables.h"
+#include "util.h"
+#include "memory.h"
+#include "virterror_internal.h"
+#include "logging.h"
+
+enum {
+    ADD = 0,
+    REMOVE,
+    CREATE,
+    POLICY,
+    INSERT
+};
+
+
+#ifdef ENABLE_EBTABLES_LOKKIT
+static void
+notifyRulesUpdated(const char *table,
+                   const char *path)
+{
+    char arg[PATH_MAX];
+    const char *argv[4];
+
+    snprintf(arg, sizeof(arg), "--custom-rules=ipv4:%s:%s", table, path);
+
+    argv[0] = (char *) LOKKIT_PATH;
+    argv[1] = (char *) "--nostart";
+    argv[2] = arg;
+    argv[3] = NULL;
+
+    char ebuf[1024];
+    if (virRun(NULL, argv, NULL) < 0)
+        VIR_WARN(_("Failed to run '%s %s': %s"),
+                 LOKKIT_PATH, arg, virStrerror(errno, ebuf, sizeof ebuf));
+}
+
+static int
+stripLine(char *str, int len, const char *line)
+{
+    char *s, *p;
+    int changed;
+
+    changed = 0;
+    s = str;
+
+    while ((p = strchr(s, '\n'))) {
+        if (p == s || STRNEQLEN(s, line, p - s)) {
+            s = ++p;
+            continue;
+        }
+
+        ++p;
+        memmove(s, p, len - (p - str) + 1);
+        len -= p - s;
+        changed = 1;
+    }
+
+    if (STREQ(s, line)) {
+        *s = '\0';
+        changed = 1;
+    }
+
+    return changed;
+}
+
+static void
+notifyRulesRemoved(const char *table,
+                   const char *path)
+{
+/* 10 MB limit on config file size as a sanity check */
+#define MAX_FILE_LEN (1024*1024*10)
+
+    char arg[PATH_MAX];
+    char *content;
+    int len;
+    FILE *f = NULL;
+
+    len = virFileReadAll(SYSCONF_DIR "/sysconfig/system-config-firewall",
+                         MAX_FILE_LEN, &content);
+    if (len < 0) {
+        VIR_WARN("%s", _("Failed to read " SYSCONF_DIR
+                         "/sysconfig/system-config-firewall"));
+        return;
+    }
+
+    snprintf(arg, sizeof(arg), "--custom-rules=ipv4:%s:%s", table, path);
+
+    if (!stripLine(content, len, arg)) {
+        VIR_FREE(content);
+        return;
+    }
+
+    if (!(f = fopen(SYSCONF_DIR "/sysconfig/system-config-firewall", "w")))
+        goto write_error;
+
+    if (fputs(content, f) == EOF)
+        goto write_error;
+
+    if (fclose(f) == EOF) {
+        f = NULL;
+        goto write_error;
+    }
+
+    VIR_FREE(content);
+
+    return;
+
+ write_error:;
+    char ebuf[1024];
+    VIR_WARN(_("Failed to write to " SYSCONF_DIR
+               "/sysconfig/system-config-firewall : %s"),
+             virStrerror(errno, ebuf, sizeof ebuf));
+    if (f)
+        fclose(f);
+    VIR_FREE(content);
+
+#undef MAX_FILE_LEN
+}
+
+static int
+writeRules(const char *path,
+           const ebtRule *rules,
+           int nrules)
+{
+    char tmp[PATH_MAX];
+    FILE *f;
+    int istmp;
+    int i;
+
+    if (nrules == 0 && unlink(path) == 0)
+        return 0;
+
+    if (snprintf(tmp, PATH_MAX, "%s.new", path) >= PATH_MAX)
+        return EINVAL;
+
+    istmp = 1;
+
+    if (!(f = fopen(tmp, "w"))) {
+        istmp = 0;
+        if (!(f = fopen(path, "w")))
+            return errno;
+    }
+
+    for (i = 0; i < nrules; i++) {
+        if (fputs(rules[i].rule, f) == EOF ||
+            fputc('\n', f) == EOF) {
+            fclose(f);
+            if (istmp)
+                unlink(tmp);
+            return errno;
+        }
+    }
+
+    fclose(f);
+
+    if (istmp && rename(tmp, path) < 0) {
+        unlink(tmp);
+        return errno;
+    }
+
+    if (istmp)
+        unlink(tmp);
+
+    return 0;
+}
+#endif /* ENABLE_EBTABLES_LOKKIT */
+
+static void
+ebtRulesSave(ebtRules *rules)
+{
+#ifdef ENABLE_EBTABLES_LOKKIT
+    int err;
+
+    char ebuf[1024];
+    if ((err = virFileMakePath(rules->dir))) {
+        VIR_WARN(_("Failed to create directory %s : %s"),
+                 rules->dir, virStrerror(err, ebuf, sizeof ebuf));
+        return;
+    }
+
+    if ((err = writeRules(rules->path, rules->rules, rules->nrules))) {
+        VIR_WARN(_("Failed to saves ebtables rules to %s : %s"),
+                 rules->path, virStrerror(err, ebuf, sizeof ebuf));
+        return;
+    }
+
+    if (rules->nrules > 0)
+        notifyRulesUpdated(rules->table, rules->path);
+    else
+        notifyRulesRemoved(rules->table, rules->path);
+#else
+    (void) rules;
+#endif /* ENABLE_EBTABLES_LOKKIT */
+}
+
+static void
+ebtRuleFree(ebtRule *rule)
+{
+    VIR_FREE(rule->rule);
+
+    if (rule->argv) {
+        int i = 0;
+        while (rule->argv[i])
+            VIR_FREE(rule->argv[i++]);
+        VIR_FREE(rule->argv);
+    }
+}
+
+static int
+ebtRulesAppend(ebtRules *rules,
+               char *rule,
+               const char **argv,
+               int command_idx)
+{
+    if (VIR_REALLOC_N(rules->rules, rules->nrules+1) < 0) {
+        int i = 0;
+        while (argv[i])
+            VIR_FREE(argv[i++]);
+        VIR_FREE(argv);
+        return ENOMEM;
+    }
+
+    rules->rules[rules->nrules].rule        = rule;
+    rules->rules[rules->nrules].argv        = argv;
+    rules->rules[rules->nrules].command_idx = command_idx;
+
+    rules->nrules++;
+
+    return 0;
+}
+
+static int
+ebtRulesRemove(ebtRules *rules,
+               char *rule)
+{
+    int i;
+
+    for (i = 0; i < rules->nrules; i++)
+        if (STREQ(rules->rules[i].rule, rule))
+            break;
+
+    if (i >= rules->nrules)
+        return EINVAL;
+
+    ebtRuleFree(&rules->rules[i]);
+
+    memmove(&rules->rules[i],
+            &rules->rules[i+1],
+            (rules->nrules - i - 1) * sizeof (ebtRule));
+
+    rules->nrules--;
+
+    return 0;
+}
+
+static void
+ebtRulesFree(ebtRules *rules)
+{
+    int i;
+
+    VIR_FREE(rules->table);
+    VIR_FREE(rules->chain);
+
+    if (rules->rules) {
+        for (i = 0; i < rules->nrules; i++)
+            ebtRuleFree(&rules->rules[i]);
+
+        VIR_FREE(rules->rules);
+
+        rules->nrules = 0;
+    }
+
+#ifdef ENABLE_EBTABLES_LOKKIT
+    rules->dir[0] = '\0';
+    rules->path[0] = '\0';
+#endif /* ENABLE_EBTABLES_LOKKIT */
+
+    VIR_FREE(rules);
+}
+
+static ebtRules *
+ebtRulesNew(const char *table,
+            const char *chain)
+{
+    ebtRules *rules;
+
+    if (VIR_ALLOC(rules) < 0)
+        return NULL;
+
+    if (!(rules->table = strdup(table)))
+        goto error;
+
+    if (!(rules->chain = strdup(chain)))
+        goto error;
+
+    rules->rules = NULL;
+    rules->nrules = 0;
+
+#ifdef ENABLE_EBTABLES_LOKKIT
+    if (virFileBuildPath(LOCAL_STATE_DIR "/lib/libvirt/ebtables", table, NULL,
+                         rules->dir, sizeof(rules->dir)) < 0)
+        goto error;
+
+    if (virFileBuildPath(rules->dir, chain, ".chain", rules->path, sizeof(rules->path)) < 0)
+        goto error;
+#endif /* ENABLE_EBTABLES_LOKKIT */
+
+    return rules;
+
+ error:
+    ebtRulesFree(rules);
+    return NULL;
+}
+
+static int
+ebtablesAddRemoveRule(ebtRules *rules, int action, const char *arg, ...)
+{
+    va_list args;
+    int retval = ENOMEM;
+    const char **argv;
+    char *rule = NULL;
+    const char *s;
+    int n, command_idx;
+
+    n = 1 + /* /sbin/ebtables  */
+        2 + /*   --table foo   */
+        2 + /*   --insert bar  */
+        1;  /*   arg           */
+
+    va_start(args, arg);
+    while ((s = va_arg(args, const char *)))
+        n++;
+
+    va_end(args);
+
+    if (VIR_ALLOC_N(argv, n + 1) < 0)
+        goto error;
+
+    n = 0;
+
+    if (!(argv[n++] = strdup(EBTABLES_PATH)))
+        goto error;
+
+/*
+    if (!(argv[n++] = strdup("--table")))
+        goto error;
+
+    if (!(argv[n++] = strdup(rules->table)))
+        goto error;
+*/
+    command_idx = n;
+
+    if(action == ADD || action == REMOVE) {
+        if (!(argv[n++] = strdup("--insert")))
+            goto error;
+
+        if (!(argv[n++] = strdup(rules->chain)))
+            goto error;
+    }
+
+    if (!(argv[n++] = strdup(arg)))
+        goto error;
+
+    va_start(args, arg);
+
+    while ((s = va_arg(args, const char *)))
+        if (!(argv[n++] = strdup(s)))
+            goto error;
+
+    va_end(args);
+
+    if (!(rule = virArgvToString(&argv[command_idx])))
+        goto error;
+
+    if (action == REMOVE) {
+        VIR_FREE(argv[command_idx]);
+        if (!(argv[command_idx] = strdup("--delete")))
+            goto error;
+    }
+
+    if (virRun(NULL, argv, NULL) < 0) {
+        retval = errno;
+        goto error;
+    }
+
+    if (action == ADD || action == CREATE || action == POLICY || action == INSERT) {
+        retval = ebtRulesAppend(rules, rule, argv, command_idx);
+        rule = NULL;
+        argv = NULL;
+    } else {
+        retval = ebtRulesRemove(rules, rule);
+    }
+
+ error:
+    VIR_FREE(rule);
+
+    if (argv) {
+        n = 0;
+        while (argv[n])
+            VIR_FREE(argv[n++]);
+        VIR_FREE(argv);
+    }
+
+    return retval;
+}
+
+/**
+ * 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;
+    char chain[PATH_MAX];
+
+    if (VIR_ALLOC(ctx) < 0)
+        return NULL;
+
+    snprintf(chain, sizeof(chain), "libvirt_%s_INPUT", driver);
+    if (!(ctx->input_filter = ebtRulesNew("filter", chain)))
+        goto error;
+
+    snprintf(chain, sizeof(chain), "libvirt_%s_FORWARD", driver);
+    if (!(ctx->forward_filter = ebtRulesNew("filter", chain)))
+        goto error;
+
+    snprintf(chain, sizeof(chain), "libvirt_%s_POSTROUTING", driver);
+    if (!(ctx->nat_postrouting = ebtRulesNew("nat", chain)))
+        goto error;
+
+    return ctx;
+
+ error:
+    ebtablesContextFree(ctx);
+    return NULL;
+}
+
+/**
+ * ebtablesContextFree:
+ * @ctx: pointer to the IP table context
+ *
+ * Free the resources associated with an IP table context
+ */
+void
+ebtablesContextFree(ebtablesContext *ctx)
+{
+    if (ctx->input_filter)
+        ebtRulesFree(ctx->input_filter);
+    if (ctx->forward_filter)
+        ebtRulesFree(ctx->forward_filter);
+    if (ctx->nat_postrouting)
+        ebtRulesFree(ctx->nat_postrouting);
+    VIR_FREE(ctx);
+}
+
+/**
+ * ebtablesSaveRules:
+ * @ctx: pointer to the IP table context
+ *
+ * Saves all the IP table rules associated with a context
+ * to disk so that if ebtables is restarted, the rules
+ * will automatically be reload.
+ */
+void
+ebtablesSaveRules(ebtablesContext *ctx)
+{
+    ebtRulesSave(ctx->input_filter);
+    ebtRulesSave(ctx->forward_filter);
+    ebtRulesSave(ctx->nat_postrouting);
+}
+
+static void
+ebtRulesReload(ebtRules *rules)
+{
+    int i;
+    char ebuf[1024];
+
+    for (i = 0; i < rules->nrules; i++) {
+        ebtRule *rule = &rules->rules[i];
+        const char *orig;
+
+        orig = rule->argv[rule->command_idx];
+        rule->argv[rule->command_idx] = (char *) "--delete";
+
+        if (virRun(NULL, rule->argv, NULL) < 0)
+            VIR_WARN(_("Failed to remove ebtables rule '%s'"
+                       " from chain '%s' in table '%s': %s"),
+                     rule->rule, rules->chain, rules->table,
+                     virStrerror(errno, ebuf, sizeof ebuf));
+
+        rule->argv[rule->command_idx] = orig;
+    }
+
+    for (i = 0; i < rules->nrules; i++)
+        if (virRun(NULL, rules->rules[i].argv, NULL) < 0)
+            VIR_WARN(_("Failed to add ebtables rule '%s'"
+                       " to chain '%s' in table '%s': %s"),
+                     rules->rules[i].rule, rules->chain, rules->table,
+                     virStrerror(errno, ebuf, sizeof ebuf));
+}
+
+/**
+ * ebtablesReloadRules:
+ * @ctx: pointer to the IP table context
+ *
+ * Reloads all the IP table rules associated to a context
+ */
+void
+ebtablesReloadRules(ebtablesContext *ctx)
+{
+    ebtRulesReload(ctx->input_filter);
+    ebtRulesReload(ctx->forward_filter);
+    ebtRulesReload(ctx->nat_postrouting);
+}
+
+/*
+static int
+ebtablesInput(ebtablesContext *ctx,
+              const char *iface,
+              int port,
+              int action,
+              int tcp)
+{
+    char portstr[32];
+
+    snprintf(portstr, sizeof(portstr), "%d", port);
+    portstr[sizeof(portstr) - 1] = '\0';
+
+    return ebtablesAddRemoveRule(ctx->input_filter,
+                                 action,
+                                 "--in-interface", iface,
+                                 "--protocol", tcp ? "tcp" : "udp",
+                                 "--destination-port", portstr,
+                                 "--jump", "ACCEPT",
+                                 NULL);
+}
+*/
+/* Allow all traffic coming from the bridge, with a valid network address
+ * to proceed to WAN
+ */
+static int
+ebtablesForwardAllowOut(ebtablesContext *ctx,
+                         const char *network,
+                         const char *iface,
+                         const char *physdev,
+                         int action)
+{
+    if (physdev && physdev[0]) {
+        return ebtablesAddRemoveRule(ctx->forward_filter,
+                                     action,
+                                     "--source", network,
+                                     "--in-interface", iface,
+                                     "--out-interface", physdev,
+                                     "--jump", "ACCEPT",
+                                     NULL);
+    } else {
+        return ebtablesAddRemoveRule(ctx->forward_filter,
+                                     action,
+                                     "--source", network,
+                                     "--in-interface", iface,
+                                     "--jump", "ACCEPT",
+                                     NULL);
+    }
+}
+
+int
+ebtablesAddForwardPolicyReject(ebtablesContext *ctx)
+{
+    return ebtablesForwardPolicyReject(ctx, ADD);
+}
+
+int
+ebtablesRemoveForwardPolicyReject(ebtablesContext *ctx)
+{
+    return ebtablesForwardPolicyReject(ctx, REMOVE);
+}
+
+int
+ebtablesForwardPolicyReject(ebtablesContext *ctx,
+                            int action)
+{
+    /* create it, if it does not exist */
+    if (action == ADD) {
+        ebtablesAddRemoveRule(ctx->forward_filter,
+                              CREATE,
+                              "--new-chain", ctx->forward_filter->chain, NULL,
+                              NULL);
+        ebtablesAddRemoveRule(ctx->forward_filter,
+                              INSERT,
+                              "--insert", "FORWARD", "--jump",
+                              ctx->forward_filter->chain, NULL);
+    }
+
+    return ebtablesAddRemoveRule(ctx->forward_filter,
+                                 POLICY,
+                                 "-P", ctx->forward_filter->chain, "DROP",
+                                 NULL);
+}
+
+/**
+ * ebtablesAddForwardAllowOut:
+ * @ctx: pointer to the IP table context
+ * @network: the source network name
+ * @iface: the source interface name
+ * @physdev: the physical output device
+ *
+ * Add a rule to the IP table context to allow the traffic for the
+ * network @network via interface @iface to be forwarded to
+ * @physdev device. This allow the outbound traffic on a bridge.
+ *
+ * Returns 0 in case of success or an error code otherwise
+ */
+int
+ebtablesAddForwardAllowOut(ebtablesContext *ctx,
+                            const char *network,
+                            const char *iface,
+                            const char *physdev)
+{
+    return ebtablesForwardAllowOut(ctx, network, iface, physdev, ADD);
+}
+
+/**
+ * ebtablesRemoveForwardAllowOut:
+ * @ctx: pointer to the IP table context
+ * @network: the source network name
+ * @iface: the source interface name
+ * @physdev: the physical output device
+ *
+ * Remove a rule from the IP table context hence forbidding forwarding
+ * of the traffic for the network @network via interface @iface
+ * to the @physdev device output. This stops the outbound traffic on a bridge.
+ *
+ * Returns 0 in case of success or an error code otherwise
+ */
+int
+ebtablesRemoveForwardAllowOut(ebtablesContext *ctx,
+                               const char *network,
+                               const char *iface,
+                               const char *physdev)
+{
+    return ebtablesForwardAllowOut(ctx, network, iface, physdev, REMOVE);
+}
+
+
+/* Allow all traffic destined to the bridge, with a valid network address
+ * and associated with an existing connection
+ */
+static int
+ebtablesForwardAllowRelatedIn(ebtablesContext *ctx,
+                       const char *network,
+                       const char *iface,
+                       const char *physdev,
+                       int action)
+{
+    if (physdev && physdev[0]) {
+        return ebtablesAddRemoveRule(ctx->forward_filter,
+                                     action,
+                                     "--destination", network,
+                                     "--in-interface", physdev,
+                                     "--out-interface", iface,
+                                     "--match", "state",
+                                     "--state", "ESTABLISHED,RELATED",
+                                     "--jump", "ACCEPT",
+                                     NULL);
+    } else {
+        return ebtablesAddRemoveRule(ctx->forward_filter,
+                                     action,
+                                     "--destination", network,
+                                     "--out-interface", iface,
+                                     "--match", "state",
+                                     "--state", "ESTABLISHED,RELATED",
+                                     "--jump", "ACCEPT",
+                                     NULL);
+    }
+}
+
+/**
+ * ebtablesAddForwardAllowRelatedIn:
+ * @ctx: pointer to the IP table context
+ * @network: the source network name
+ * @iface: the output interface name
+ * @physdev: the physical input device or NULL
+ *
+ * Add rules to the IP table context to allow the traffic for the
+ * network @network on @physdev device to be forwarded to
+ * interface @iface, if it is part of an existing connection.
+ *
+ * Returns 0 in case of success or an error code otherwise
+ */
+int
+ebtablesAddForwardAllowRelatedIn(ebtablesContext *ctx,
+                          const char *network,
+                          const char *iface,
+                          const char *physdev)
+{
+    return ebtablesForwardAllowRelatedIn(ctx, network, iface, physdev, ADD);
+}
+
+/**
+ * ebtablesRemoveForwardAllowRelatedIn:
+ * @ctx: pointer to the IP table context
+ * @network: the source network name
+ * @iface: the output interface name
+ * @physdev: the physical input device or NULL
+ *
+ * Remove rules from the IP table context hence forbidding the traffic for
+ * network @network on @physdev device to be forwarded to
+ * interface @iface, if it is part of an existing connection.
+ *
+ * Returns 0 in case of success or an error code otherwise
+ */
+int
+ebtablesRemoveForwardAllowRelatedIn(ebtablesContext *ctx,
+                             const char *network,
+                             const char *iface,
+                             const char *physdev)
+{
+    return ebtablesForwardAllowRelatedIn(ctx, network, iface, physdev, REMOVE);
+}
+
+/* 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)
+{
+    return ebtablesAddRemoveRule(ctx->forward_filter,
+                                     action,
+/*                                     "--destination", network,*/
+/*                                     "--insert", "FORWARD",*/
+                                     "--in-interface", iface,
+/*                                   "--out-interface", network, */
+                                     "--source", macaddr,
+                                     "--jump", "ACCEPT",
+                                     NULL);
+}
+
+/**
+ * ebtablesAddForwardAllowIn:
+ * @ctx: pointer to the IP table context
+ * @network: the source network name
+ * @iface: the output interface name
+ * @physdev: the physical input device or NULL
+ *
+ * Add rules to the IP table context to allow the traffic for the
+ * network @network on @physdev device to be forwarded to
+ * interface @iface. This allow 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 char *physdev)
+{
+    return ebtablesForwardAllowIn(ctx, iface, physdev, ADD);
+}
+
+/**
+ * ebtablesRemoveForwardAllowIn:
+ * @ctx: pointer to the IP table context
+ * @network: the source network name
+ * @iface: the output interface name
+ * @physdev: the physical input device or NULL
+ *
+ * Remove rules from the IP table context hence forbidding the traffic for
+ * network @network on @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 char *physdev)
+{
+    return ebtablesForwardAllowIn(ctx, iface, physdev, REMOVE);
+}
+
+
+/* Allow all traffic between guests on the same bridge,
+ * with a valid network address
+ */
+static int
+ebtablesForwardAllowCross(ebtablesContext *ctx,
+                          const char *iface,
+                          int action)
+{
+    return ebtablesAddRemoveRule(ctx->forward_filter,
+                                 action,
+                                 "--in-interface", iface,
+                                 "--out-interface", iface,
+                                 "--jump", "ACCEPT",
+                                 NULL);
+}
+
+/**
+ * ebtablesAddForwardAllowCross:
+ * @ctx: pointer to the IP table context
+ * @iface: the input/output interface name
+ *
+ * Add rules to the IP table context to allow traffic to cross that
+ * interface. It allows all traffic between guests on the same bridge
+ * represented by that interface.
+ *
+ * Returns 0 in case of success or an error code otherwise
+ */
+int
+ebtablesAddForwardAllowCross(ebtablesContext *ctx,
+                             const char *iface) {
+    return ebtablesForwardAllowCross(ctx, iface, ADD);
+}
+
+/**
+ * ebtablesRemoveForwardAllowCross:
+ * @ctx: pointer to the IP table context
+ * @iface: the input/output interface name
+ *
+ * Remove rules to the IP table context to block traffic to cross that
+ * interface. It forbids traffic between guests on the same bridge
+ * represented by that interface.
+ *
+ * Returns 0 in case of success or an error code otherwise
+ */
+int
+ebtablesRemoveForwardAllowCross(ebtablesContext *ctx,
+                                const char *iface) {
+    return ebtablesForwardAllowCross(ctx, iface, REMOVE);
+}
+
+
+/* Drop all traffic trying to forward from the bridge.
+ * ie the bridge is the in interface
+ */
+static int
+ebtablesForwardRejectOut(ebtablesContext *ctx,
+                         const char *iface,
+                         int action)
+{
+    return ebtablesAddRemoveRule(ctx->forward_filter,
+                                     action,
+                                     "--in-interface", iface,
+                                     "--jump", "DROP",
+                                     NULL);
+}
+
+/**
+ * ebtablesAddForwardRejectOut:
+ * @ctx: pointer to the EB table context
+ * @iface: the output interface name
+ *
+ * Add rules to the EB table context to forbid all traffic to that
+ * interface. It forbids forwarding from the bridge to that interface.
+ *
+ * Returns 0 in case of success or an error code otherwise
+ */
+int
+ebtablesAddForwardRejectOut(ebtablesContext *ctx,
+                            const char *iface)
+{
+    return ebtablesForwardRejectOut(ctx, iface, ADD);
+}
+
+/**
+ * ebtablesRemoveForwardRejectOut:
+ * @ctx: pointer to the EB table context
+ * @iface: the output interface name
+ *
+ * Remove rules from the EB table context forbidding all traffic to that
+ * interface. It reallow forwarding from the bridge to that interface.
+ *
+ * Returns 0 in case of success or an error code otherwise
+ */
+int
+ebtablesRemoveForwardRejectOut(ebtablesContext *ctx,
+                               const char *iface)
+{
+    return ebtablesForwardRejectOut(ctx, iface, REMOVE);
+}
+
+
+
+
+/* Drop all traffic trying to forward to the bridge.
+ * ie the bridge is the out interface
+ */
+static int
+ebtablesForwardRejectIn(ebtablesContext *ctx,
+                        const char *iface,
+                        int action)
+{
+    return ebtablesAddRemoveRule(ctx->forward_filter,
+                                 action,
+                                 "--out-interface", iface,
+                                 "--jump", "DROP",
+                                 NULL);
+}
+
+/**
+ * ebtablesAddForwardRejectIn:
+ * @ctx: pointer to the IP table context
+ * @iface: the input interface name
+ *
+ * Add rules to the IP table context to forbid all traffic from that
+ * interface. It forbids forwarding from that interface to the bridge.
+ *
+ * Returns 0 in case of success or an error code otherwise
+ */
+int
+ebtablesAddForwardRejectIn(ebtablesContext *ctx,
+                           const char *iface)
+{
+    return ebtablesForwardRejectIn(ctx, iface, ADD);
+}
+
+/**
+ * ebtablesRemoveForwardRejectIn:
+ * @ctx: pointer to the IP table context
+ * @iface: the input interface name
+ *
+ * Remove rules from the IP table context forbidding all traffic from that
+ * interface. It allows forwarding from that interface to the bridge.
+ *
+ * Returns 0 in case of success or an error code otherwise
+ */
+int
+ebtablesRemoveForwardRejectIn(ebtablesContext *ctx,
+                              const char *iface)
+{
+    return ebtablesForwardRejectIn(ctx, iface, REMOVE);
+}
diff --git a/src/util/ebtables.h b/src/util/ebtables.h
new file mode 100644
index 0000000..a3f403a
--- /dev/null
+++ b/src/util/ebtables.h
@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2009 IBM Corp.
+ * Copyright (C) 2007, 2008 Red Hat, Inc.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+ *
+ * based on iptables.h
+ * Authors:
+ *     Gerhard Stenzel <gerhard stenzel de ibm com>
+ */
+
+#ifndef __QEMUD_EBTABLES_H__
+#define __QEMUD_EBTABLES_H__
+
+typedef struct
+{
+    char  *rule;
+    const char **argv;
+    int    command_idx;
+} ebtRule;
+
+typedef struct
+{
+    char  *table;
+    char  *chain;
+
+    int      nrules;
+    ebtRule *rules;
+
+#ifdef ENABLE_EBTABLES_LOKKIT
+
+    char   dir[PATH_MAX];
+    char   path[PATH_MAX];
+
+#endif /* ENABLE_EBTABLES_LOKKIT */
+
+} ebtRules;
+
+struct _ebtablesContext
+{
+    ebtRules *input_filter;
+    ebtRules *forward_filter;
+    ebtRules *nat_postrouting;
+};
+
+typedef struct _ebtablesContext ebtablesContext;
+
+ebtablesContext *ebtablesContextNew              (const char *driver);
+void             ebtablesContextFree             (ebtablesContext *ctx);
+
+void             ebtablesSaveRules               (ebtablesContext *ctx);
+void             ebtablesReloadRules             (ebtablesContext *ctx);
+
+int              ebtablesAddTcpInput             (ebtablesContext *ctx,
+                                                  const char *iface,
+                                                  int port);
+int              ebtablesRemoveTcpInput          (ebtablesContext *ctx,
+                                                  const char *iface,
+                                                  int port);
+
+int              ebtablesAddUdpInput             (ebtablesContext *ctx,
+                                                  const char *iface,
+                                                  int port);
+int              ebtablesRemoveUdpInput          (ebtablesContext *ctx,
+                                                  const char *iface,
+                                                  int port);
+
+int              ebtablesAddForwardAllowOut      (ebtablesContext *ctx,
+                                                  const char *network,
+                                                  const char *iface,
+                                                  const char *physdev);
+int              ebtablesRemoveForwardAllowOut   (ebtablesContext *ctx,
+                                                  const char *network,
+                                                  const char *iface,
+                                                  const char *physdev);
+
+int              ebtablesAddForwardAllowRelatedIn(ebtablesContext *ctx,
+                                                  const char *network,
+                                                  const char *iface,
+                                                  const char *physdev);
+int              ebtablesRemoveForwardAllowRelatedIn(ebtablesContext *ctx,
+                                                  const char *network,
+                                                  const char *iface,
+                                                  const char *physdev);
+
+int              ebtablesAddForwardAllowIn       (ebtablesContext *ctx,
+                                                  const char *iface,
+                                                  const char *physdev);
+int              ebtablesRemoveForwardAllowIn    (ebtablesContext *ctx,
+                                                  const char *iface,
+                                                  const char *physdev);
+
+int              ebtablesAddForwardAllowCross    (ebtablesContext *ctx,
+                                                  const char *iface);
+int              ebtablesRemoveForwardAllowCross (ebtablesContext *ctx,
+                                                  const char *iface);
+
+int              ebtablesAddForwardRejectOut     (ebtablesContext *ctx,
+                                                  const char *iface);
+int              ebtablesRemoveForwardRejectOut  (ebtablesContext *ctx,
+                                                  const char *iface);
+
+int              ebtablesAddForwardRejectIn      (ebtablesContext *ctx,
+                                                  const char *iface);
+int              ebtablesRemoveForwardRejectIn   (ebtablesContext *ctx,
+                                                  const char *iface);
+
+int              ebtablesAddForwardMasquerade    (ebtablesContext *ctx,
+                                                  const char *network,
+                                                  const char *physdev);
+int              ebtablesRemoveForwardMasquerade (ebtablesContext *ctx,
+                                                  const char *network,
+                                                  const char *physdev);
+
+int              ebtablesAddForwardPolicyReject(ebtablesContext *ctx);
+
+int              ebtablesRemoveForwardPolicyReject(ebtablesContext *ctx);
+
+int              ebtablesForwardPolicyReject(ebtablesContext *ctx,
+                                                  int action);
+
+#endif /* __QEMUD_ebtabLES_H__ */


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