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author | Arturo Borrero <arturo.borrero.glez@gmail.com> | 2014-10-17 12:39:09 +0200 |
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committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2014-10-27 22:49:39 +0100 |
commit | e9105f1bead4ec3f64904564c7c6268185d6b363 (patch) | |
tree | c2b91e5f3183503759fd8759cdeb9bf3ccf45af2 /net/netfilter/nft_redir.c | |
parent | 9de920eddb74bf67f1d6af603acc5ed05dcd35e9 (diff) | |
download | op-kernel-dev-e9105f1bead4ec3f64904564c7c6268185d6b363.zip op-kernel-dev-e9105f1bead4ec3f64904564c7c6268185d6b363.tar.gz |
netfilter: nf_tables: add new expression nft_redir
This new expression provides NAT in the redirect flavour, which is to
redirect packets to local machine.
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nft_redir.c')
-rw-r--r-- | net/netfilter/nft_redir.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/net/netfilter/nft_redir.c b/net/netfilter/nft_redir.c new file mode 100644 index 0000000..e27b4e3 --- /dev/null +++ b/net/netfilter/nft_redir.c @@ -0,0 +1,98 @@ +/* + * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> + * + * 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_nat.h> +#include <net/netfilter/nf_tables.h> +#include <net/netfilter/nft_redir.h> + +const struct nla_policy nft_redir_policy[NFTA_REDIR_MAX + 1] = { + [NFTA_REDIR_REG_PROTO_MIN] = { .type = NLA_U32 }, + [NFTA_REDIR_REG_PROTO_MAX] = { .type = NLA_U32 }, + [NFTA_REDIR_FLAGS] = { .type = NLA_U32 }, +}; +EXPORT_SYMBOL_GPL(nft_redir_policy); + +int nft_redir_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_redir *priv = nft_expr_priv(expr); + u32 nla_be32; + int err; + + err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT); + if (err < 0) + return err; + + if (tb[NFTA_REDIR_REG_PROTO_MIN]) { + nla_be32 = nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MIN]); + priv->sreg_proto_min = ntohl(nla_be32); + err = nft_validate_input_register(priv->sreg_proto_min); + if (err < 0) + return err; + + if (tb[NFTA_REDIR_REG_PROTO_MAX]) { + nla_be32 = nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MAX]); + priv->sreg_proto_max = ntohl(nla_be32); + err = nft_validate_input_register(priv->sreg_proto_max); + if (err < 0) + return err; + } else { + priv->sreg_proto_max = priv->sreg_proto_min; + } + } + + if (tb[NFTA_REDIR_FLAGS]) { + priv->flags = ntohl(nla_get_be32(tb[NFTA_REDIR_FLAGS])); + if (priv->flags & ~NF_NAT_RANGE_MASK) + return -EINVAL; + } + + return 0; +} +EXPORT_SYMBOL_GPL(nft_redir_init); + +int nft_redir_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + const struct nft_redir *priv = nft_expr_priv(expr); + + if (priv->sreg_proto_min) { + if (nla_put_be32(skb, NFTA_REDIR_REG_PROTO_MIN, + htonl(priv->sreg_proto_min))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_REDIR_REG_PROTO_MAX, + htonl(priv->sreg_proto_max))) + goto nla_put_failure; + } + + if (priv->flags != 0 && + nla_put_be32(skb, NFTA_REDIR_FLAGS, htonl(priv->flags))) + goto nla_put_failure; + + return 0; + +nla_put_failure: + return -1; +} +EXPORT_SYMBOL_GPL(nft_redir_dump); + +int nft_redir_validate(const struct nft_ctx *ctx, const struct nft_expr *expr, + const struct nft_data **data) +{ + return nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT); +} +EXPORT_SYMBOL_GPL(nft_redir_validate); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>"); |