| /* |
| * 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_tables.h> |
| #include <net/netfilter/nf_nat.h> |
| #include <net/netfilter/nf_nat_redirect.h> |
| #include <net/netfilter/nft_redir.h> |
| |
| static void nft_redir_ipv4_eval(const struct nft_expr *expr, |
| struct nft_regs *regs, |
| const struct nft_pktinfo *pkt) |
| { |
| struct nft_redir *priv = nft_expr_priv(expr); |
| struct nf_nat_ipv4_multi_range_compat mr; |
| |
| memset(&mr, 0, sizeof(mr)); |
| if (priv->sreg_proto_min) { |
| mr.range[0].min.all = |
| *(__be16 *)®s->data[priv->sreg_proto_min]; |
| mr.range[0].max.all = |
| *(__be16 *)®s->data[priv->sreg_proto_max]; |
| mr.range[0].flags |= NF_NAT_RANGE_PROTO_SPECIFIED; |
| } |
| |
| mr.range[0].flags |= priv->flags; |
| |
| regs->verdict.code = nf_nat_redirect_ipv4(pkt->skb, &mr, |
| pkt->hook); |
| } |
| |
| static struct nft_expr_type nft_redir_ipv4_type; |
| static const struct nft_expr_ops nft_redir_ipv4_ops = { |
| .type = &nft_redir_ipv4_type, |
| .size = NFT_EXPR_SIZE(sizeof(struct nft_redir)), |
| .eval = nft_redir_ipv4_eval, |
| .init = nft_redir_init, |
| .dump = nft_redir_dump, |
| .validate = nft_redir_validate, |
| }; |
| |
| static struct nft_expr_type nft_redir_ipv4_type __read_mostly = { |
| .family = NFPROTO_IPV4, |
| .name = "redir", |
| .ops = &nft_redir_ipv4_ops, |
| .policy = nft_redir_policy, |
| .maxattr = NFTA_REDIR_MAX, |
| .owner = THIS_MODULE, |
| }; |
| |
| static int __init nft_redir_ipv4_module_init(void) |
| { |
| return nft_register_expr(&nft_redir_ipv4_type); |
| } |
| |
| static void __exit nft_redir_ipv4_module_exit(void) |
| { |
| nft_unregister_expr(&nft_redir_ipv4_type); |
| } |
| |
| module_init(nft_redir_ipv4_module_init); |
| module_exit(nft_redir_ipv4_module_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>"); |
| MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "redir"); |