Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/net/netfilter/xt_connmark.c b/kernel/net/netfilter/xt_connmark.c
new file mode 100644 (file)
index 0000000..69f78e9
--- /dev/null
+++ b/kernel/net/netfilter/xt_connmark.c
@@ -0,0 +1,166 @@
+/*
+ *     xt_connmark - Netfilter module to operate on connection marks
+ *
+ *     Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
+ *     by Henrik Nordstrom <hno@marasystems.com>
+ *     Copyright © CC Computer Consultants GmbH, 2007 - 2008
+ *     Jan Engelhardt <jengelh@medozas.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_ecache.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_connmark.h>
+
+MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>");
+MODULE_DESCRIPTION("Xtables: connection mark operations");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_CONNMARK");
+MODULE_ALIAS("ip6t_CONNMARK");
+MODULE_ALIAS("ipt_connmark");
+MODULE_ALIAS("ip6t_connmark");
+
+static unsigned int
+connmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
+{
+       const struct xt_connmark_tginfo1 *info = par->targinfo;
+       enum ip_conntrack_info ctinfo;
+       struct nf_conn *ct;
+       u_int32_t newmark;
+
+       ct = nf_ct_get(skb, &ctinfo);
+       if (ct == NULL)
+               return XT_CONTINUE;
+
+       switch (info->mode) {
+       case XT_CONNMARK_SET:
+               newmark = (ct->mark & ~info->ctmask) ^ info->ctmark;
+               if (ct->mark != newmark) {
+                       ct->mark = newmark;
+                       nf_conntrack_event_cache(IPCT_MARK, ct);
+               }
+               break;
+       case XT_CONNMARK_SAVE:
+               newmark = (ct->mark & ~info->ctmask) ^
+                         (skb->mark & info->nfmask);
+               if (ct->mark != newmark) {
+                       ct->mark = newmark;
+                       nf_conntrack_event_cache(IPCT_MARK, ct);
+               }
+               break;
+       case XT_CONNMARK_RESTORE:
+               newmark = (skb->mark & ~info->nfmask) ^
+                         (ct->mark & info->ctmask);
+               skb->mark = newmark;
+               break;
+       }
+
+       return XT_CONTINUE;
+}
+
+static int connmark_tg_check(const struct xt_tgchk_param *par)
+{
+       int ret;
+
+       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;
+}
+
+static void connmark_tg_destroy(const struct xt_tgdtor_param *par)
+{
+       nf_ct_l3proto_module_put(par->family);
+}
+
+static bool
+connmark_mt(const struct sk_buff *skb, struct xt_action_param *par)
+{
+       const struct xt_connmark_mtinfo1 *info = par->matchinfo;
+       enum ip_conntrack_info ctinfo;
+       const struct nf_conn *ct;
+
+       ct = nf_ct_get(skb, &ctinfo);
+       if (ct == NULL)
+               return false;
+
+       return ((ct->mark & info->mask) == info->mark) ^ info->invert;
+}
+
+static int connmark_mt_check(const struct xt_mtchk_param *par)
+{
+       int ret;
+
+       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;
+}
+
+static void connmark_mt_destroy(const struct xt_mtdtor_param *par)
+{
+       nf_ct_l3proto_module_put(par->family);
+}
+
+static struct xt_target connmark_tg_reg __read_mostly = {
+       .name           = "CONNMARK",
+       .revision       = 1,
+       .family         = NFPROTO_UNSPEC,
+       .checkentry     = connmark_tg_check,
+       .target         = connmark_tg,
+       .targetsize     = sizeof(struct xt_connmark_tginfo1),
+       .destroy        = connmark_tg_destroy,
+       .me             = THIS_MODULE,
+};
+
+static struct xt_match connmark_mt_reg __read_mostly = {
+       .name           = "connmark",
+       .revision       = 1,
+       .family         = NFPROTO_UNSPEC,
+       .checkentry     = connmark_mt_check,
+       .match          = connmark_mt,
+       .matchsize      = sizeof(struct xt_connmark_mtinfo1),
+       .destroy        = connmark_mt_destroy,
+       .me             = THIS_MODULE,
+};
+
+static int __init connmark_mt_init(void)
+{
+       int ret;
+
+       ret = xt_register_target(&connmark_tg_reg);
+       if (ret < 0)
+               return ret;
+       ret = xt_register_match(&connmark_mt_reg);
+       if (ret < 0) {
+               xt_unregister_target(&connmark_tg_reg);
+               return ret;
+       }
+       return 0;
+}
+
+static void __exit connmark_mt_exit(void)
+{
+       xt_unregister_match(&connmark_mt_reg);
+       xt_unregister_target(&connmark_tg_reg);
+}
+
+module_init(connmark_mt_init);
+module_exit(connmark_mt_exit);