Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/net/netfilter/nft_bitwise.c b/kernel/net/netfilter/nft_bitwise.c
new file mode 100644 (file)
index 0000000..d71cc18
--- /dev/null
+++ b/kernel/net/netfilter/nft_bitwise.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2008-2009 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/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables_core.h>
+#include <net/netfilter/nf_tables.h>
+
+struct nft_bitwise {
+       enum nft_registers      sreg:8;
+       enum nft_registers      dreg:8;
+       u8                      len;
+       struct nft_data         mask;
+       struct nft_data         xor;
+};
+
+static void nft_bitwise_eval(const struct nft_expr *expr,
+                            struct nft_regs *regs,
+                            const struct nft_pktinfo *pkt)
+{
+       const struct nft_bitwise *priv = nft_expr_priv(expr);
+       const u32 *src = &regs->data[priv->sreg];
+       u32 *dst = &regs->data[priv->dreg];
+       unsigned int i;
+
+       for (i = 0; i < DIV_ROUND_UP(priv->len, 4); i++)
+               dst[i] = (src[i] & priv->mask.data[i]) ^ priv->xor.data[i];
+}
+
+static const struct nla_policy nft_bitwise_policy[NFTA_BITWISE_MAX + 1] = {
+       [NFTA_BITWISE_SREG]     = { .type = NLA_U32 },
+       [NFTA_BITWISE_DREG]     = { .type = NLA_U32 },
+       [NFTA_BITWISE_LEN]      = { .type = NLA_U32 },
+       [NFTA_BITWISE_MASK]     = { .type = NLA_NESTED },
+       [NFTA_BITWISE_XOR]      = { .type = NLA_NESTED },
+};
+
+static int nft_bitwise_init(const struct nft_ctx *ctx,
+                           const struct nft_expr *expr,
+                           const struct nlattr * const tb[])
+{
+       struct nft_bitwise *priv = nft_expr_priv(expr);
+       struct nft_data_desc d1, d2;
+       int err;
+
+       if (tb[NFTA_BITWISE_SREG] == NULL ||
+           tb[NFTA_BITWISE_DREG] == NULL ||
+           tb[NFTA_BITWISE_LEN] == NULL ||
+           tb[NFTA_BITWISE_MASK] == NULL ||
+           tb[NFTA_BITWISE_XOR] == NULL)
+               return -EINVAL;
+
+       priv->len  = ntohl(nla_get_be32(tb[NFTA_BITWISE_LEN]));
+       priv->sreg = nft_parse_register(tb[NFTA_BITWISE_SREG]);
+       err = nft_validate_register_load(priv->sreg, priv->len);
+       if (err < 0)
+               return err;
+
+       priv->dreg = nft_parse_register(tb[NFTA_BITWISE_DREG]);
+       err = nft_validate_register_store(ctx, priv->dreg, NULL,
+                                         NFT_DATA_VALUE, priv->len);
+       if (err < 0)
+               return err;
+
+       err = nft_data_init(NULL, &priv->mask, sizeof(priv->mask), &d1,
+                           tb[NFTA_BITWISE_MASK]);
+       if (err < 0)
+               return err;
+       if (d1.len != priv->len)
+               return -EINVAL;
+
+       err = nft_data_init(NULL, &priv->xor, sizeof(priv->xor), &d2,
+                           tb[NFTA_BITWISE_XOR]);
+       if (err < 0)
+               return err;
+       if (d2.len != priv->len)
+               return -EINVAL;
+
+       return 0;
+}
+
+static int nft_bitwise_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+       const struct nft_bitwise *priv = nft_expr_priv(expr);
+
+       if (nft_dump_register(skb, NFTA_BITWISE_SREG, priv->sreg))
+               goto nla_put_failure;
+       if (nft_dump_register(skb, NFTA_BITWISE_DREG, priv->dreg))
+               goto nla_put_failure;
+       if (nla_put_be32(skb, NFTA_BITWISE_LEN, htonl(priv->len)))
+               goto nla_put_failure;
+
+       if (nft_data_dump(skb, NFTA_BITWISE_MASK, &priv->mask,
+                         NFT_DATA_VALUE, priv->len) < 0)
+               goto nla_put_failure;
+
+       if (nft_data_dump(skb, NFTA_BITWISE_XOR, &priv->xor,
+                         NFT_DATA_VALUE, priv->len) < 0)
+               goto nla_put_failure;
+
+       return 0;
+
+nla_put_failure:
+       return -1;
+}
+
+static struct nft_expr_type nft_bitwise_type;
+static const struct nft_expr_ops nft_bitwise_ops = {
+       .type           = &nft_bitwise_type,
+       .size           = NFT_EXPR_SIZE(sizeof(struct nft_bitwise)),
+       .eval           = nft_bitwise_eval,
+       .init           = nft_bitwise_init,
+       .dump           = nft_bitwise_dump,
+};
+
+static struct nft_expr_type nft_bitwise_type __read_mostly = {
+       .name           = "bitwise",
+       .ops            = &nft_bitwise_ops,
+       .policy         = nft_bitwise_policy,
+       .maxattr        = NFTA_BITWISE_MAX,
+       .owner          = THIS_MODULE,
+};
+
+int __init nft_bitwise_module_init(void)
+{
+       return nft_register_expr(&nft_bitwise_type);
+}
+
+void nft_bitwise_module_exit(void)
+{
+       nft_unregister_expr(&nft_bitwise_type);
+}