Arturo Borrero | e9105f1 | 2014-10-17 12:39:09 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/netlink.h> |
| 13 | #include <linux/netfilter.h> |
| 14 | #include <linux/netfilter/nf_tables.h> |
| 15 | #include <net/netfilter/nf_tables.h> |
| 16 | #include <net/netfilter/nf_nat.h> |
Pablo Neira Ayuso | b59eaf9 | 2014-11-26 12:46:50 +0100 | [diff] [blame] | 17 | #include <net/netfilter/nf_nat_redirect.h> |
Arturo Borrero | e9105f1 | 2014-10-17 12:39:09 +0200 | [diff] [blame] | 18 | #include <net/netfilter/nft_redir.h> |
| 19 | |
| 20 | static void nft_redir_ipv4_eval(const struct nft_expr *expr, |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 21 | struct nft_regs *regs, |
Arturo Borrero | e9105f1 | 2014-10-17 12:39:09 +0200 | [diff] [blame] | 22 | const struct nft_pktinfo *pkt) |
| 23 | { |
| 24 | struct nft_redir *priv = nft_expr_priv(expr); |
| 25 | struct nf_nat_ipv4_multi_range_compat mr; |
Arturo Borrero | e9105f1 | 2014-10-17 12:39:09 +0200 | [diff] [blame] | 26 | |
| 27 | memset(&mr, 0, sizeof(mr)); |
| 28 | if (priv->sreg_proto_min) { |
leroy christophe | 7b5bca4 | 2014-12-22 13:20:14 +0100 | [diff] [blame] | 29 | mr.range[0].min.all = |
Patrick McHardy | 49499c3 | 2015-04-11 02:27:37 +0100 | [diff] [blame] | 30 | *(__be16 *)®s->data[priv->sreg_proto_min]; |
leroy christophe | 7b5bca4 | 2014-12-22 13:20:14 +0100 | [diff] [blame] | 31 | mr.range[0].max.all = |
Patrick McHardy | 49499c3 | 2015-04-11 02:27:37 +0100 | [diff] [blame] | 32 | *(__be16 *)®s->data[priv->sreg_proto_max]; |
Arturo Borrero | e9105f1 | 2014-10-17 12:39:09 +0200 | [diff] [blame] | 33 | mr.range[0].flags |= NF_NAT_RANGE_PROTO_SPECIFIED; |
| 34 | } |
| 35 | |
| 36 | mr.range[0].flags |= priv->flags; |
| 37 | |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 38 | regs->verdict.code = nf_nat_redirect_ipv4(pkt->skb, &mr, |
| 39 | pkt->ops->hooknum); |
Arturo Borrero | e9105f1 | 2014-10-17 12:39:09 +0200 | [diff] [blame] | 40 | } |
| 41 | |
| 42 | static struct nft_expr_type nft_redir_ipv4_type; |
| 43 | static const struct nft_expr_ops nft_redir_ipv4_ops = { |
| 44 | .type = &nft_redir_ipv4_type, |
| 45 | .size = NFT_EXPR_SIZE(sizeof(struct nft_redir)), |
| 46 | .eval = nft_redir_ipv4_eval, |
| 47 | .init = nft_redir_init, |
| 48 | .dump = nft_redir_dump, |
| 49 | .validate = nft_redir_validate, |
| 50 | }; |
| 51 | |
| 52 | static struct nft_expr_type nft_redir_ipv4_type __read_mostly = { |
| 53 | .family = NFPROTO_IPV4, |
| 54 | .name = "redir", |
| 55 | .ops = &nft_redir_ipv4_ops, |
| 56 | .policy = nft_redir_policy, |
| 57 | .maxattr = NFTA_REDIR_MAX, |
| 58 | .owner = THIS_MODULE, |
| 59 | }; |
| 60 | |
| 61 | static int __init nft_redir_ipv4_module_init(void) |
| 62 | { |
| 63 | return nft_register_expr(&nft_redir_ipv4_type); |
| 64 | } |
| 65 | |
| 66 | static void __exit nft_redir_ipv4_module_exit(void) |
| 67 | { |
| 68 | nft_unregister_expr(&nft_redir_ipv4_type); |
| 69 | } |
| 70 | |
| 71 | module_init(nft_redir_ipv4_module_init); |
| 72 | module_exit(nft_redir_ipv4_module_exit); |
| 73 | |
| 74 | MODULE_LICENSE("GPL"); |
| 75 | MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>"); |
| 76 | MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "redir"); |