Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/net/netfilter/nft_payload.c b/kernel/net/netfilter/nft_payload.c
new file mode 100644 (file)
index 0000000..94fb3b2
--- /dev/null
+++ b/kernel/net/netfilter/nft_payload.c
@@ -0,0 +1,157 @@
+/*
+ * 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>
+
+static void nft_payload_eval(const struct nft_expr *expr,
+                            struct nft_regs *regs,
+                            const struct nft_pktinfo *pkt)
+{
+       const struct nft_payload *priv = nft_expr_priv(expr);
+       const struct sk_buff *skb = pkt->skb;
+       u32 *dest = &regs->data[priv->dreg];
+       int offset;
+
+       switch (priv->base) {
+       case NFT_PAYLOAD_LL_HEADER:
+               if (!skb_mac_header_was_set(skb))
+                       goto err;
+               offset = skb_mac_header(skb) - skb->data;
+               break;
+       case NFT_PAYLOAD_NETWORK_HEADER:
+               offset = skb_network_offset(skb);
+               break;
+       case NFT_PAYLOAD_TRANSPORT_HEADER:
+               offset = pkt->xt.thoff;
+               break;
+       default:
+               BUG();
+       }
+       offset += priv->offset;
+
+       dest[priv->len / NFT_REG32_SIZE] = 0;
+       if (skb_copy_bits(skb, offset, dest, priv->len) < 0)
+               goto err;
+       return;
+err:
+       regs->verdict.code = NFT_BREAK;
+}
+
+static const struct nla_policy nft_payload_policy[NFTA_PAYLOAD_MAX + 1] = {
+       [NFTA_PAYLOAD_DREG]     = { .type = NLA_U32 },
+       [NFTA_PAYLOAD_BASE]     = { .type = NLA_U32 },
+       [NFTA_PAYLOAD_OFFSET]   = { .type = NLA_U32 },
+       [NFTA_PAYLOAD_LEN]      = { .type = NLA_U32 },
+};
+
+static int nft_payload_init(const struct nft_ctx *ctx,
+                           const struct nft_expr *expr,
+                           const struct nlattr * const tb[])
+{
+       struct nft_payload *priv = nft_expr_priv(expr);
+
+       priv->base   = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE]));
+       priv->offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET]));
+       priv->len    = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN]));
+       priv->dreg   = nft_parse_register(tb[NFTA_PAYLOAD_DREG]);
+
+       return nft_validate_register_store(ctx, priv->dreg, NULL,
+                                          NFT_DATA_VALUE, priv->len);
+}
+
+static int nft_payload_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+       const struct nft_payload *priv = nft_expr_priv(expr);
+
+       if (nft_dump_register(skb, NFTA_PAYLOAD_DREG, priv->dreg) ||
+           nla_put_be32(skb, NFTA_PAYLOAD_BASE, htonl(priv->base)) ||
+           nla_put_be32(skb, NFTA_PAYLOAD_OFFSET, htonl(priv->offset)) ||
+           nla_put_be32(skb, NFTA_PAYLOAD_LEN, htonl(priv->len)))
+               goto nla_put_failure;
+       return 0;
+
+nla_put_failure:
+       return -1;
+}
+
+static struct nft_expr_type nft_payload_type;
+static const struct nft_expr_ops nft_payload_ops = {
+       .type           = &nft_payload_type,
+       .size           = NFT_EXPR_SIZE(sizeof(struct nft_payload)),
+       .eval           = nft_payload_eval,
+       .init           = nft_payload_init,
+       .dump           = nft_payload_dump,
+};
+
+const struct nft_expr_ops nft_payload_fast_ops = {
+       .type           = &nft_payload_type,
+       .size           = NFT_EXPR_SIZE(sizeof(struct nft_payload)),
+       .eval           = nft_payload_eval,
+       .init           = nft_payload_init,
+       .dump           = nft_payload_dump,
+};
+
+static const struct nft_expr_ops *
+nft_payload_select_ops(const struct nft_ctx *ctx,
+                      const struct nlattr * const tb[])
+{
+       enum nft_payload_bases base;
+       unsigned int offset, len;
+
+       if (tb[NFTA_PAYLOAD_DREG] == NULL ||
+           tb[NFTA_PAYLOAD_BASE] == NULL ||
+           tb[NFTA_PAYLOAD_OFFSET] == NULL ||
+           tb[NFTA_PAYLOAD_LEN] == NULL)
+               return ERR_PTR(-EINVAL);
+
+       base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE]));
+       switch (base) {
+       case NFT_PAYLOAD_LL_HEADER:
+       case NFT_PAYLOAD_NETWORK_HEADER:
+       case NFT_PAYLOAD_TRANSPORT_HEADER:
+               break;
+       default:
+               return ERR_PTR(-EOPNOTSUPP);
+       }
+
+       offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET]));
+       len    = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN]));
+
+       if (len <= 4 && is_power_of_2(len) && IS_ALIGNED(offset, len) &&
+           base != NFT_PAYLOAD_LL_HEADER)
+               return &nft_payload_fast_ops;
+       else
+               return &nft_payload_ops;
+}
+
+static struct nft_expr_type nft_payload_type __read_mostly = {
+       .name           = "payload",
+       .select_ops     = nft_payload_select_ops,
+       .policy         = nft_payload_policy,
+       .maxattr        = NFTA_PAYLOAD_MAX,
+       .owner          = THIS_MODULE,
+};
+
+int __init nft_payload_module_init(void)
+{
+       return nft_register_expr(&nft_payload_type);
+}
+
+void nft_payload_module_exit(void)
+{
+       nft_unregister_expr(&nft_payload_type);
+}