Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / netfilter / xt_devgroup.c

diff --git a/kernel/net/netfilter/xt_devgroup.c b/kernel/net/netfilter/xt_devgroup.c
new file mode 100644 (file)
index 0000000..d9202cd
--- /dev/null
+++ b/kernel/net/netfilter/xt_devgroup.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+
+#include <linux/netfilter/xt_devgroup.h>
+#include <linux/netfilter/x_tables.h>
+
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Xtables: Device group match");
+MODULE_ALIAS("ipt_devgroup");
+MODULE_ALIAS("ip6t_devgroup");
+
+static bool devgroup_mt(const struct sk_buff *skb, struct xt_action_param *par)
+{
+       const struct xt_devgroup_info *info = par->matchinfo;
+
+       if (info->flags & XT_DEVGROUP_MATCH_SRC &&
+           (((info->src_group ^ par->in->group) & info->src_mask ? 1 : 0) ^
+            ((info->flags & XT_DEVGROUP_INVERT_SRC) ? 1 : 0)))
+               return false;
+
+       if (info->flags & XT_DEVGROUP_MATCH_DST &&
+           (((info->dst_group ^ par->out->group) & info->dst_mask ? 1 : 0) ^
+            ((info->flags & XT_DEVGROUP_INVERT_DST) ? 1 : 0)))
+               return false;
+
+       return true;
+}
+
+static int devgroup_mt_checkentry(const struct xt_mtchk_param *par)
+{
+       const struct xt_devgroup_info *info = par->matchinfo;
+
+       if (info->flags & ~(XT_DEVGROUP_MATCH_SRC | XT_DEVGROUP_INVERT_SRC |
+                           XT_DEVGROUP_MATCH_DST | XT_DEVGROUP_INVERT_DST))
+               return -EINVAL;
+
+       if (info->flags & XT_DEVGROUP_MATCH_SRC &&
+           par->hook_mask & ~((1 << NF_INET_PRE_ROUTING) |
+                              (1 << NF_INET_LOCAL_IN) |
+                              (1 << NF_INET_FORWARD)))
+               return -EINVAL;
+
+       if (info->flags & XT_DEVGROUP_MATCH_DST &&
+           par->hook_mask & ~((1 << NF_INET_FORWARD) |
+                              (1 << NF_INET_LOCAL_OUT) |
+                              (1 << NF_INET_POST_ROUTING)))
+               return -EINVAL;
+
+       return 0;
+}
+
+static struct xt_match devgroup_mt_reg __read_mostly = {
+       .name           = "devgroup",
+       .match          = devgroup_mt,
+       .checkentry     = devgroup_mt_checkentry,
+       .matchsize      = sizeof(struct xt_devgroup_info),
+       .family         = NFPROTO_UNSPEC,
+       .me             = THIS_MODULE
+};
+
+static int __init devgroup_mt_init(void)
+{
+       return xt_register_match(&devgroup_mt_reg);
+}
+
+static void __exit devgroup_mt_exit(void)
+{
+       xt_unregister_match(&devgroup_mt_reg);
+}
+
+module_init(devgroup_mt_init);
+module_exit(devgroup_mt_exit);