| /* |
| * 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_validate(const struct nft_ctx *ctx, |
| const struct nft_expr *expr, |
| const struct nft_data **data) |
| { |
| int err; |
| |
| err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT); |
| if (err < 0) |
| return err; |
| |
| return nft_chain_validate_hooks(ctx->chain, |
| (1 << NF_INET_PRE_ROUTING) | |
| (1 << NF_INET_LOCAL_OUT)); |
| } |
| EXPORT_SYMBOL_GPL(nft_redir_validate); |
| |
| 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); |
| unsigned int plen; |
| int err; |
| |
| err = nft_redir_validate(ctx, expr, NULL); |
| if (err < 0) |
| return err; |
| |
| plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all); |
| if (tb[NFTA_REDIR_REG_PROTO_MIN]) { |
| priv->sreg_proto_min = |
| ntohl(nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MIN])); |
| |
| err = nft_validate_register_load(priv->sreg_proto_min, plen); |
| if (err < 0) |
| return err; |
| |
| if (tb[NFTA_REDIR_REG_PROTO_MAX]) { |
| priv->sreg_proto_max = |
| ntohl(nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MAX])); |
| |
| err = nft_validate_register_load(priv->sreg_proto_max, |
| plen); |
| 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); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>"); |