Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/net/netfilter/nft_exthdr.c b/kernel/net/netfilter/nft_exthdr.c
new file mode 100644 (file)
index 0000000..ba7aed1
--- /dev/null
+++ b/kernel/net/netfilter/nft_exthdr.c
@@ -0,0 +1,128 @@
+/*
+ * Copyright (c) 2008 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.h>
+// FIXME:
+#include <net/ipv6.h>
+
+struct nft_exthdr {
+       u8                      type;
+       u8                      offset;
+       u8                      len;
+       enum nft_registers      dreg:8;
+};
+
+static void nft_exthdr_eval(const struct nft_expr *expr,
+                           struct nft_regs *regs,
+                           const struct nft_pktinfo *pkt)
+{
+       struct nft_exthdr *priv = nft_expr_priv(expr);
+       u32 *dest = &regs->data[priv->dreg];
+       unsigned int offset = 0;
+       int err;
+
+       err = ipv6_find_hdr(pkt->skb, &offset, priv->type, NULL, NULL);
+       if (err < 0)
+               goto err;
+       offset += priv->offset;
+
+       dest[priv->len / NFT_REG32_SIZE] = 0;
+       if (skb_copy_bits(pkt->skb, offset, dest, priv->len) < 0)
+               goto err;
+       return;
+err:
+       regs->verdict.code = NFT_BREAK;
+}
+
+static const struct nla_policy nft_exthdr_policy[NFTA_EXTHDR_MAX + 1] = {
+       [NFTA_EXTHDR_DREG]              = { .type = NLA_U32 },
+       [NFTA_EXTHDR_TYPE]              = { .type = NLA_U8 },
+       [NFTA_EXTHDR_OFFSET]            = { .type = NLA_U32 },
+       [NFTA_EXTHDR_LEN]               = { .type = NLA_U32 },
+};
+
+static int nft_exthdr_init(const struct nft_ctx *ctx,
+                          const struct nft_expr *expr,
+                          const struct nlattr * const tb[])
+{
+       struct nft_exthdr *priv = nft_expr_priv(expr);
+
+       if (tb[NFTA_EXTHDR_DREG] == NULL ||
+           tb[NFTA_EXTHDR_TYPE] == NULL ||
+           tb[NFTA_EXTHDR_OFFSET] == NULL ||
+           tb[NFTA_EXTHDR_LEN] == NULL)
+               return -EINVAL;
+
+       priv->type   = nla_get_u8(tb[NFTA_EXTHDR_TYPE]);
+       priv->offset = ntohl(nla_get_be32(tb[NFTA_EXTHDR_OFFSET]));
+       priv->len    = ntohl(nla_get_be32(tb[NFTA_EXTHDR_LEN]));
+       priv->dreg   = nft_parse_register(tb[NFTA_EXTHDR_DREG]);
+
+       return nft_validate_register_store(ctx, priv->dreg, NULL,
+                                          NFT_DATA_VALUE, priv->len);
+}
+
+static int nft_exthdr_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+       const struct nft_exthdr *priv = nft_expr_priv(expr);
+
+       if (nft_dump_register(skb, NFTA_EXTHDR_DREG, priv->dreg))
+               goto nla_put_failure;
+       if (nla_put_u8(skb, NFTA_EXTHDR_TYPE, priv->type))
+               goto nla_put_failure;
+       if (nla_put_be32(skb, NFTA_EXTHDR_OFFSET, htonl(priv->offset)))
+               goto nla_put_failure;
+       if (nla_put_be32(skb, NFTA_EXTHDR_LEN, htonl(priv->len)))
+               goto nla_put_failure;
+       return 0;
+
+nla_put_failure:
+       return -1;
+}
+
+static struct nft_expr_type nft_exthdr_type;
+static const struct nft_expr_ops nft_exthdr_ops = {
+       .type           = &nft_exthdr_type,
+       .size           = NFT_EXPR_SIZE(sizeof(struct nft_exthdr)),
+       .eval           = nft_exthdr_eval,
+       .init           = nft_exthdr_init,
+       .dump           = nft_exthdr_dump,
+};
+
+static struct nft_expr_type nft_exthdr_type __read_mostly = {
+       .name           = "exthdr",
+       .ops            = &nft_exthdr_ops,
+       .policy         = nft_exthdr_policy,
+       .maxattr        = NFTA_EXTHDR_MAX,
+       .owner          = THIS_MODULE,
+};
+
+static int __init nft_exthdr_module_init(void)
+{
+       return nft_register_expr(&nft_exthdr_type);
+}
+
+static void __exit nft_exthdr_module_exit(void)
+{
+       nft_unregister_expr(&nft_exthdr_type);
+}
+
+module_init(nft_exthdr_module_init);
+module_exit(nft_exthdr_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_ALIAS_NFT_EXPR("exthdr");