libxt_AUDIT: add AUDIT target

libxt module for the AUDIT target.

-j AUDIT --type (accept|reject|drop)

Signed-off-by: Thomas Graf <tgraf@redhat.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/extensions/libxt_AUDIT.c b/extensions/libxt_AUDIT.c
new file mode 100644 (file)
index 0000000..1f2dee4
--- /dev/null
+++ b/extensions/libxt_AUDIT.c
@@ -0,0 +1,123 @@
+/* Shared library add-on to xtables for AUDIT
+ *
+ * (C) 2010-2011, Thomas Graf <tgraf@redhat.com>
+ * (C) 2010-2011, Red Hat, Inc.
+ *
+ * This program is distributed under the terms of GNU GPL v2, 1991
+ */
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+#include <xtables.h>
+#include <linux/netfilter/xt_AUDIT.h>
+
+static void audit_help(void)
+{
+       printf(
+"AUDIT target options\n"
+"  --type TYPE         Action type to be recorded.\n");
+}
+
+static const struct option audit_opts[] = {
+       {.name = "type", .has_arg = true, .val = 't'},
+       XT_GETOPT_TABLEEND,
+};
+
+static int audit_parse(int c, char **argv, int invert, unsigned int *flags,
+                     const void *entry, struct xt_entry_target **target)
+{
+       struct xt_audit_info *einfo
+               = (struct xt_audit_info *)(*target)->data;
+
+       switch (c) {
+       case 't':
+               if (!strcasecmp(optarg, "accept"))
+                       einfo->type = XT_AUDIT_TYPE_ACCEPT;
+               else if (!strcasecmp(optarg, "drop"))
+                       einfo->type = XT_AUDIT_TYPE_DROP;
+               else if (!strcasecmp(optarg, "reject"))
+                       einfo->type = XT_AUDIT_TYPE_REJECT;
+               else
+                       xtables_error(PARAMETER_PROBLEM,
+                                  "Bad action type value `%s'", optarg);
+
+               if (*flags)
+                       xtables_error(PARAMETER_PROBLEM,
+                                  "AUDIT: Can't specify --type twice");
+               *flags = 1;
+               break;
+       default:
+               return 0;
+       }
+
+       return 1;
+}
+
+static void audit_final_check(unsigned int flags)
+{
+       if (!flags)
+               xtables_error(PARAMETER_PROBLEM,
+                          "AUDIT target: Parameter --type is required");
+}
+
+static void audit_print(const void *ip, const struct xt_entry_target *target,
+                      int numeric)
+{
+       const struct xt_audit_info *einfo =
+               (const struct xt_audit_info *)target->data;
+
+       printf("AUDIT ");
+
+       switch(einfo->type) {
+       case XT_AUDIT_TYPE_ACCEPT:
+               printf("accept");
+               break;
+       case XT_AUDIT_TYPE_DROP:
+               printf("drop");
+               break;
+       case XT_AUDIT_TYPE_REJECT:
+               printf("reject");
+               break;
+       }
+}
+
+static void audit_save(const void *ip, const struct xt_entry_target *target)
+{
+       const struct xt_audit_info *einfo =
+               (const struct xt_audit_info *)target->data;
+
+       switch(einfo->type) {
+       case XT_AUDIT_TYPE_ACCEPT:
+               printf("--type=accept");
+               break;
+       case XT_AUDIT_TYPE_DROP:
+               printf("--type=drop");
+               break;
+       case XT_AUDIT_TYPE_REJECT:
+               printf("--type=reject");
+               break;
+       }
+}
+
+static struct xtables_target audit_tg_reg = {
+       .name           = "AUDIT",
+       .version        = XTABLES_VERSION,
+       .family         = NFPROTO_UNSPEC,
+       .size           = XT_ALIGN(sizeof(struct xt_audit_info)),
+       .userspacesize  = XT_ALIGN(sizeof(struct xt_audit_info)),
+       .help           = audit_help,
+       .parse          = audit_parse,
+       .final_check    = audit_final_check,
+       .print          = audit_print,
+       .save           = audit_save,
+       .extra_opts     = audit_opts,
+};
+
+void _init(void)
+{
+       xtables_register_target(&audit_tg_reg);
+}

diff --git a/include/linux/netfilter/xt_AUDIT.h b/include/linux/netfilter/xt_AUDIT.h
new file mode 100644 (file)
index 0000000..38751d2
--- /dev/null
+++ b/include/linux/netfilter/xt_AUDIT.h
@@ -0,0 +1,30 @@
+/*
+ * Header file for iptables xt_AUDIT target
+ *
+ * (C) 2010-2011 Thomas Graf <tgraf@redhat.com>
+ * (C) 2010-2011 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _XT_AUDIT_TARGET_H
+#define _XT_AUDIT_TARGET_H
+
+#include <linux/types.h>
+
+enum {
+       XT_AUDIT_TYPE_ACCEPT = 0,
+       XT_AUDIT_TYPE_DROP,
+       XT_AUDIT_TYPE_REJECT,
+       __XT_AUDIT_TYPE_MAX,
+};
+
+#define XT_AUDIT_TYPE_MAX (__XT_AUDIT_TYPE_MAX - 1)
+
+struct xt_audit_info {
+       __u8 type; /* XT_AUDIT_TYPE_* */
+};
+
+#endif /* _XT_AUDIT_TARGET_H */