Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/net/netfilter/xt_connlabel.c b/kernel/net/netfilter/xt_connlabel.c
new file mode 100644 (file)
index 0000000..9f8719d
--- /dev/null
+++ b/kernel/net/netfilter/xt_connlabel.c
@@ -0,0 +1,99 @@
+/*
+ * (C) 2013 Astaro GmbH & Co KG
+ *
+ * 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 <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_labels.h>
+#include <linux/netfilter/x_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
+MODULE_DESCRIPTION("Xtables: add/match connection trackling labels");
+MODULE_ALIAS("ipt_connlabel");
+MODULE_ALIAS("ip6t_connlabel");
+
+static bool
+connlabel_mt(const struct sk_buff *skb, struct xt_action_param *par)
+{
+       const struct xt_connlabel_mtinfo *info = par->matchinfo;
+       enum ip_conntrack_info ctinfo;
+       struct nf_conn *ct;
+       bool invert = info->options & XT_CONNLABEL_OP_INVERT;
+
+       ct = nf_ct_get(skb, &ctinfo);
+       if (ct == NULL || nf_ct_is_untracked(ct))
+               return invert;
+
+       if (info->options & XT_CONNLABEL_OP_SET)
+               return (nf_connlabel_set(ct, info->bit) == 0) ^ invert;
+
+       return nf_connlabel_match(ct, info->bit) ^ invert;
+}
+
+static int connlabel_mt_check(const struct xt_mtchk_param *par)
+{
+       const int options = XT_CONNLABEL_OP_INVERT |
+                           XT_CONNLABEL_OP_SET;
+       struct xt_connlabel_mtinfo *info = par->matchinfo;
+       int ret;
+       size_t words;
+
+       if (info->bit > XT_CONNLABEL_MAXBIT)
+               return -ERANGE;
+
+       if (info->options & ~options) {
+               pr_err("Unknown options in mask %x\n", info->options);
+               return -EINVAL;
+       }
+
+       ret = nf_ct_l3proto_try_module_get(par->family);
+       if (ret < 0) {
+               pr_info("cannot load conntrack support for proto=%u\n",
+                                                       par->family);
+               return ret;
+       }
+
+       par->net->ct.labels_used++;
+       words = BITS_TO_LONGS(info->bit+1);
+       if (words > par->net->ct.label_words)
+               par->net->ct.label_words = words;
+
+       return ret;
+}
+
+static void connlabel_mt_destroy(const struct xt_mtdtor_param *par)
+{
+       par->net->ct.labels_used--;
+       if (par->net->ct.labels_used == 0)
+               par->net->ct.label_words = 0;
+       nf_ct_l3proto_module_put(par->family);
+}
+
+static struct xt_match connlabels_mt_reg __read_mostly = {
+       .name           = "connlabel",
+       .family         = NFPROTO_UNSPEC,
+       .checkentry     = connlabel_mt_check,
+       .match          = connlabel_mt,
+       .matchsize      = sizeof(struct xt_connlabel_mtinfo),
+       .destroy        = connlabel_mt_destroy,
+       .me             = THIS_MODULE,
+};
+
+static int __init connlabel_mt_init(void)
+{
+       return xt_register_match(&connlabels_mt_reg);
+}
+
+static void __exit connlabel_mt_exit(void)
+{
+       xt_unregister_match(&connlabels_mt_reg);
+}
+
+module_init(connlabel_mt_init);
+module_exit(connlabel_mt_exit);