| /* |
| * 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/nft_masq.h> |
| #include <net/netfilter/ipv4/nf_nat_masquerade.h> |
| |
| static void nft_masq_ipv4_eval(const struct nft_expr *expr, |
| struct nft_data data[NFT_REG_MAX + 1], |
| const struct nft_pktinfo *pkt) |
| { |
| struct nft_masq *priv = nft_expr_priv(expr); |
| struct nf_nat_range range; |
| unsigned int verdict; |
| |
| range.flags = priv->flags; |
| |
| verdict = nf_nat_masquerade_ipv4(pkt->skb, pkt->ops->hooknum, |
| &range, pkt->out); |
| |
| data[NFT_REG_VERDICT].verdict = verdict; |
| } |
| |
| static int nft_masq_ipv4_init(const struct nft_ctx *ctx, |
| const struct nft_expr *expr, |
| const struct nlattr * const tb[]) |
| { |
| int err; |
| |
| err = nft_masq_init(ctx, expr, tb); |
| if (err < 0) |
| return err; |
| |
| nf_nat_masquerade_ipv4_register_notifier(); |
| return 0; |
| } |
| |
| static void nft_masq_ipv4_destroy(const struct nft_ctx *ctx, |
| const struct nft_expr *expr) |
| { |
| nf_nat_masquerade_ipv4_unregister_notifier(); |
| } |
| |
| static struct nft_expr_type nft_masq_ipv4_type; |
| static const struct nft_expr_ops nft_masq_ipv4_ops = { |
| .type = &nft_masq_ipv4_type, |
| .size = NFT_EXPR_SIZE(sizeof(struct nft_masq)), |
| .eval = nft_masq_ipv4_eval, |
| .init = nft_masq_ipv4_init, |
| .destroy = nft_masq_ipv4_destroy, |
| .dump = nft_masq_dump, |
| }; |
| |
| static struct nft_expr_type nft_masq_ipv4_type __read_mostly = { |
| .family = NFPROTO_IPV4, |
| .name = "masq", |
| .ops = &nft_masq_ipv4_ops, |
| .policy = nft_masq_policy, |
| .maxattr = NFTA_MASQ_MAX, |
| .owner = THIS_MODULE, |
| }; |
| |
| static int __init nft_masq_ipv4_module_init(void) |
| { |
| return nft_register_expr(&nft_masq_ipv4_type); |
| } |
| |
| static void __exit nft_masq_ipv4_module_exit(void) |
| { |
| nft_unregister_expr(&nft_masq_ipv4_type); |
| } |
| |
| module_init(nft_masq_ipv4_module_init); |
| module_exit(nft_masq_ipv4_module_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>"); |
| MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "masq"); |