Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / bridge / netfilter / nft_meta_bridge.c

diff --git a/kernel/net/bridge/netfilter/nft_meta_bridge.c b/kernel/net/bridge/netfilter/nft_meta_bridge.c
new file mode 100644 (file)
index 0000000..a21269b
--- /dev/null
+++ b/kernel/net/bridge/netfilter/nft_meta_bridge.c
@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 2014 Intel Corporation
+ *
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nft_meta.h>
+
+#include "../br_private.h"
+
+static void nft_meta_bridge_get_eval(const struct nft_expr *expr,
+                                    struct nft_regs *regs,
+                                    const struct nft_pktinfo *pkt)
+{
+       const struct nft_meta *priv = nft_expr_priv(expr);
+       const struct net_device *in = pkt->in, *out = pkt->out;
+       u32 *dest = &regs->data[priv->dreg];
+       const struct net_bridge_port *p;
+
+       switch (priv->key) {
+       case NFT_META_BRI_IIFNAME:
+               if (in == NULL || (p = br_port_get_rcu(in)) == NULL)
+                       goto err;
+               break;
+       case NFT_META_BRI_OIFNAME:
+               if (out == NULL || (p = br_port_get_rcu(out)) == NULL)
+                       goto err;
+               break;
+       default:
+               goto out;
+       }
+
+       strncpy((char *)dest, p->br->dev->name, IFNAMSIZ);
+       return;
+out:
+       return nft_meta_get_eval(expr, regs, pkt);
+err:
+       regs->verdict.code = NFT_BREAK;
+}
+
+static int nft_meta_bridge_get_init(const struct nft_ctx *ctx,
+                                   const struct nft_expr *expr,
+                                   const struct nlattr * const tb[])
+{
+       struct nft_meta *priv = nft_expr_priv(expr);
+       unsigned int len;
+
+       priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
+       switch (priv->key) {
+       case NFT_META_BRI_IIFNAME:
+       case NFT_META_BRI_OIFNAME:
+               len = IFNAMSIZ;
+               break;
+       default:
+               return nft_meta_get_init(ctx, expr, tb);
+       }
+
+       priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
+       return nft_validate_register_store(ctx, priv->dreg, NULL,
+                                          NFT_DATA_VALUE, len);
+}
+
+static struct nft_expr_type nft_meta_bridge_type;
+static const struct nft_expr_ops nft_meta_bridge_get_ops = {
+       .type           = &nft_meta_bridge_type,
+       .size           = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
+       .eval           = nft_meta_bridge_get_eval,
+       .init           = nft_meta_bridge_get_init,
+       .dump           = nft_meta_get_dump,
+};
+
+static const struct nft_expr_ops nft_meta_bridge_set_ops = {
+       .type           = &nft_meta_bridge_type,
+       .size           = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
+       .eval           = nft_meta_set_eval,
+       .init           = nft_meta_set_init,
+       .dump           = nft_meta_set_dump,
+};
+
+static const struct nft_expr_ops *
+nft_meta_bridge_select_ops(const struct nft_ctx *ctx,
+                          const struct nlattr * const tb[])
+{
+       if (tb[NFTA_META_KEY] == NULL)
+               return ERR_PTR(-EINVAL);
+
+       if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
+               return ERR_PTR(-EINVAL);
+
+       if (tb[NFTA_META_DREG])
+               return &nft_meta_bridge_get_ops;
+
+       if (tb[NFTA_META_SREG])
+               return &nft_meta_bridge_set_ops;
+
+       return ERR_PTR(-EINVAL);
+}
+
+static struct nft_expr_type nft_meta_bridge_type __read_mostly = {
+       .family         = NFPROTO_BRIDGE,
+       .name           = "meta",
+       .select_ops     = &nft_meta_bridge_select_ops,
+       .policy         = nft_meta_policy,
+       .maxattr        = NFTA_META_MAX,
+       .owner          = THIS_MODULE,
+};
+
+static int __init nft_meta_bridge_module_init(void)
+{
+       return nft_register_expr(&nft_meta_bridge_type);
+}
+
+static void __exit nft_meta_bridge_module_exit(void)
+{
+       nft_unregister_expr(&nft_meta_bridge_type);
+}
+
+module_init(nft_meta_bridge_module_init);
+module_exit(nft_meta_bridge_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
+MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "meta");