Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/net/netfilter/nft_lookup.c b/kernel/net/netfilter/nft_lookup.c
new file mode 100644 (file)
index 0000000..b3c31ef
--- /dev/null
+++ b/kernel/net/netfilter/nft_lookup.c
@@ -0,0 +1,155 @@
+/*
+ * Copyright (c) 2009 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.
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/rbtree.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables_core.h>
+
+struct nft_lookup {
+       struct nft_set                  *set;
+       enum nft_registers              sreg:8;
+       enum nft_registers              dreg:8;
+       struct nft_set_binding          binding;
+};
+
+static void nft_lookup_eval(const struct nft_expr *expr,
+                           struct nft_regs *regs,
+                           const struct nft_pktinfo *pkt)
+{
+       const struct nft_lookup *priv = nft_expr_priv(expr);
+       const struct nft_set *set = priv->set;
+       const struct nft_set_ext *ext;
+
+       if (set->ops->lookup(set, &regs->data[priv->sreg], &ext)) {
+               if (set->flags & NFT_SET_MAP)
+                       nft_data_copy(&regs->data[priv->dreg],
+                                     nft_set_ext_data(ext), set->dlen);
+               return;
+       }
+       regs->verdict.code = NFT_BREAK;
+}
+
+static const struct nla_policy nft_lookup_policy[NFTA_LOOKUP_MAX + 1] = {
+       [NFTA_LOOKUP_SET]       = { .type = NLA_STRING },
+       [NFTA_LOOKUP_SET_ID]    = { .type = NLA_U32 },
+       [NFTA_LOOKUP_SREG]      = { .type = NLA_U32 },
+       [NFTA_LOOKUP_DREG]      = { .type = NLA_U32 },
+};
+
+static int nft_lookup_init(const struct nft_ctx *ctx,
+                          const struct nft_expr *expr,
+                          const struct nlattr * const tb[])
+{
+       struct nft_lookup *priv = nft_expr_priv(expr);
+       struct nft_set *set;
+       int err;
+
+       if (tb[NFTA_LOOKUP_SET] == NULL ||
+           tb[NFTA_LOOKUP_SREG] == NULL)
+               return -EINVAL;
+
+       set = nf_tables_set_lookup(ctx->table, tb[NFTA_LOOKUP_SET]);
+       if (IS_ERR(set)) {
+               if (tb[NFTA_LOOKUP_SET_ID]) {
+                       set = nf_tables_set_lookup_byid(ctx->net,
+                                                       tb[NFTA_LOOKUP_SET_ID]);
+               }
+               if (IS_ERR(set))
+                       return PTR_ERR(set);
+       }
+
+       if (set->flags & NFT_SET_EVAL)
+               return -EOPNOTSUPP;
+
+       priv->sreg = nft_parse_register(tb[NFTA_LOOKUP_SREG]);
+       err = nft_validate_register_load(priv->sreg, set->klen);
+       if (err < 0)
+               return err;
+
+       if (tb[NFTA_LOOKUP_DREG] != NULL) {
+               if (!(set->flags & NFT_SET_MAP))
+                       return -EINVAL;
+
+               priv->dreg = nft_parse_register(tb[NFTA_LOOKUP_DREG]);
+               err = nft_validate_register_store(ctx, priv->dreg, NULL,
+                                                 set->dtype, set->dlen);
+               if (err < 0)
+                       return err;
+       } else if (set->flags & NFT_SET_MAP)
+               return -EINVAL;
+
+       priv->binding.flags = set->flags & NFT_SET_MAP;
+
+       err = nf_tables_bind_set(ctx, set, &priv->binding);
+       if (err < 0)
+               return err;
+
+       priv->set = set;
+       return 0;
+}
+
+static void nft_lookup_destroy(const struct nft_ctx *ctx,
+                              const struct nft_expr *expr)
+{
+       struct nft_lookup *priv = nft_expr_priv(expr);
+
+       nf_tables_unbind_set(ctx, priv->set, &priv->binding);
+}
+
+static int nft_lookup_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+       const struct nft_lookup *priv = nft_expr_priv(expr);
+
+       if (nla_put_string(skb, NFTA_LOOKUP_SET, priv->set->name))
+               goto nla_put_failure;
+       if (nft_dump_register(skb, NFTA_LOOKUP_SREG, priv->sreg))
+               goto nla_put_failure;
+       if (priv->set->flags & NFT_SET_MAP)
+               if (nft_dump_register(skb, NFTA_LOOKUP_DREG, priv->dreg))
+                       goto nla_put_failure;
+       return 0;
+
+nla_put_failure:
+       return -1;
+}
+
+static struct nft_expr_type nft_lookup_type;
+static const struct nft_expr_ops nft_lookup_ops = {
+       .type           = &nft_lookup_type,
+       .size           = NFT_EXPR_SIZE(sizeof(struct nft_lookup)),
+       .eval           = nft_lookup_eval,
+       .init           = nft_lookup_init,
+       .destroy        = nft_lookup_destroy,
+       .dump           = nft_lookup_dump,
+};
+
+static struct nft_expr_type nft_lookup_type __read_mostly = {
+       .name           = "lookup",
+       .ops            = &nft_lookup_ops,
+       .policy         = nft_lookup_policy,
+       .maxattr        = NFTA_LOOKUP_MAX,
+       .owner          = THIS_MODULE,
+};
+
+int __init nft_lookup_module_init(void)
+{
+       return nft_register_expr(&nft_lookup_type);
+}
+
+void nft_lookup_module_exit(void)
+{
+       nft_unregister_expr(&nft_lookup_type);
+}