Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/net/netfilter/xt_CONNSECMARK.c b/kernel/net/netfilter/xt_CONNSECMARK.c
new file mode 100644 (file)
index 0000000..e04dc28
--- /dev/null
+++ b/kernel/net/netfilter/xt_CONNSECMARK.c
@@ -0,0 +1,143 @@
+/*
+ * This module is used to copy security markings from packets
+ * to connections, and restore security markings from connections
+ * back to packets.  This would normally be performed in conjunction
+ * with the SECMARK target and state match.
+ *
+ * Based somewhat on CONNMARK:
+ *   Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
+ *    by Henrik Nordstrom <hno@marasystems.com>
+ *
+ * (C) 2006,2008 Red Hat, Inc., James Morris <jmorris@redhat.com>
+ *
+ * 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.
+ *
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_CONNSECMARK.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_ecache.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("James Morris <jmorris@redhat.com>");
+MODULE_DESCRIPTION("Xtables: target for copying between connection and security mark");
+MODULE_ALIAS("ipt_CONNSECMARK");
+MODULE_ALIAS("ip6t_CONNSECMARK");
+
+/*
+ * If the packet has a security mark and the connection does not, copy
+ * the security mark from the packet to the connection.
+ */
+static void secmark_save(const struct sk_buff *skb)
+{
+       if (skb->secmark) {
+               struct nf_conn *ct;
+               enum ip_conntrack_info ctinfo;
+
+               ct = nf_ct_get(skb, &ctinfo);
+               if (ct && !ct->secmark) {
+                       ct->secmark = skb->secmark;
+                       nf_conntrack_event_cache(IPCT_SECMARK, ct);
+               }
+       }
+}
+
+/*
+ * If packet has no security mark, and the connection does, restore the
+ * security mark from the connection to the packet.
+ */
+static void secmark_restore(struct sk_buff *skb)
+{
+       if (!skb->secmark) {
+               const struct nf_conn *ct;
+               enum ip_conntrack_info ctinfo;
+
+               ct = nf_ct_get(skb, &ctinfo);
+               if (ct && ct->secmark)
+                       skb->secmark = ct->secmark;
+       }
+}
+
+static unsigned int
+connsecmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
+{
+       const struct xt_connsecmark_target_info *info = par->targinfo;
+
+       switch (info->mode) {
+       case CONNSECMARK_SAVE:
+               secmark_save(skb);
+               break;
+
+       case CONNSECMARK_RESTORE:
+               secmark_restore(skb);
+               break;
+
+       default:
+               BUG();
+       }
+
+       return XT_CONTINUE;
+}
+
+static int connsecmark_tg_check(const struct xt_tgchk_param *par)
+{
+       const struct xt_connsecmark_target_info *info = par->targinfo;
+       int ret;
+
+       if (strcmp(par->table, "mangle") != 0 &&
+           strcmp(par->table, "security") != 0) {
+               pr_info("target only valid in the \'mangle\' "
+                       "or \'security\' tables, not \'%s\'.\n", par->table);
+               return -EINVAL;
+       }
+
+       switch (info->mode) {
+       case CONNSECMARK_SAVE:
+       case CONNSECMARK_RESTORE:
+               break;
+
+       default:
+               pr_info("invalid mode: %hu\n", info->mode);
+               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;
+}
+
+static void connsecmark_tg_destroy(const struct xt_tgdtor_param *par)
+{
+       nf_ct_l3proto_module_put(par->family);
+}
+
+static struct xt_target connsecmark_tg_reg __read_mostly = {
+       .name       = "CONNSECMARK",
+       .revision   = 0,
+       .family     = NFPROTO_UNSPEC,
+       .checkentry = connsecmark_tg_check,
+       .destroy    = connsecmark_tg_destroy,
+       .target     = connsecmark_tg,
+       .targetsize = sizeof(struct xt_connsecmark_target_info),
+       .me         = THIS_MODULE,
+};
+
+static int __init connsecmark_tg_init(void)
+{
+       return xt_register_target(&connsecmark_tg_reg);
+}
+
+static void __exit connsecmark_tg_exit(void)
+{
+       xt_unregister_target(&connsecmark_tg_reg);
+}
+
+module_init(connsecmark_tg_init);
+module_exit(connsecmark_tg_exit);