Arturo Borrero | 9ba1f726 | 2014-09-08 13:45:00 +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/nft_masq.h> |
| 17 | #include <net/netfilter/ipv4/nf_nat_masquerade.h> |
| 18 | |
| 19 | static void nft_masq_ipv4_eval(const struct nft_expr *expr, |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 20 | struct nft_regs *regs, |
Arturo Borrero | 9ba1f726 | 2014-09-08 13:45:00 +0200 | [diff] [blame] | 21 | const struct nft_pktinfo *pkt) |
| 22 | { |
| 23 | struct nft_masq *priv = nft_expr_priv(expr); |
| 24 | struct nf_nat_range range; |
Arturo Borrero | 9ba1f726 | 2014-09-08 13:45:00 +0200 | [diff] [blame] | 25 | |
Daniel Borkmann | 6b96686 | 2014-11-07 15:34:54 +0100 | [diff] [blame] | 26 | memset(&range, 0, sizeof(range)); |
Arturo Borrero | 9ba1f726 | 2014-09-08 13:45:00 +0200 | [diff] [blame] | 27 | range.flags = priv->flags; |
Pablo Neira Ayuso | 8a6bf5d | 2016-03-01 19:55:14 +0100 | [diff] [blame] | 28 | if (priv->sreg_proto_min) { |
| 29 | range.min_proto.all = |
| 30 | *(__be16 *)®s->data[priv->sreg_proto_min]; |
| 31 | range.max_proto.all = |
| 32 | *(__be16 *)®s->data[priv->sreg_proto_max]; |
| 33 | } |
Eric W. Biederman | 6aa187f | 2015-09-18 14:32:57 -0500 | [diff] [blame] | 34 | regs->verdict.code = nf_nat_masquerade_ipv4(pkt->skb, pkt->hook, |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 35 | &range, pkt->out); |
Arturo Borrero | 9ba1f726 | 2014-09-08 13:45:00 +0200 | [diff] [blame] | 36 | } |
| 37 | |
Arturo Borrero | 9ba1f726 | 2014-09-08 13:45:00 +0200 | [diff] [blame] | 38 | static struct nft_expr_type nft_masq_ipv4_type; |
| 39 | static const struct nft_expr_ops nft_masq_ipv4_ops = { |
| 40 | .type = &nft_masq_ipv4_type, |
| 41 | .size = NFT_EXPR_SIZE(sizeof(struct nft_masq)), |
| 42 | .eval = nft_masq_ipv4_eval, |
Arturo Borrero | 8da4cc1 | 2014-10-03 14:13:36 +0200 | [diff] [blame] | 43 | .init = nft_masq_init, |
Arturo Borrero | 9ba1f726 | 2014-09-08 13:45:00 +0200 | [diff] [blame] | 44 | .dump = nft_masq_dump, |
Pablo Neira Ayuso | 7210e4e | 2014-10-13 19:50:22 +0200 | [diff] [blame] | 45 | .validate = nft_masq_validate, |
Arturo Borrero | 9ba1f726 | 2014-09-08 13:45:00 +0200 | [diff] [blame] | 46 | }; |
| 47 | |
| 48 | static struct nft_expr_type nft_masq_ipv4_type __read_mostly = { |
| 49 | .family = NFPROTO_IPV4, |
| 50 | .name = "masq", |
| 51 | .ops = &nft_masq_ipv4_ops, |
| 52 | .policy = nft_masq_policy, |
| 53 | .maxattr = NFTA_MASQ_MAX, |
| 54 | .owner = THIS_MODULE, |
| 55 | }; |
| 56 | |
| 57 | static int __init nft_masq_ipv4_module_init(void) |
| 58 | { |
Arturo Borrero | 8da4cc1 | 2014-10-03 14:13:36 +0200 | [diff] [blame] | 59 | int ret; |
| 60 | |
| 61 | ret = nft_register_expr(&nft_masq_ipv4_type); |
| 62 | if (ret < 0) |
| 63 | return ret; |
| 64 | |
| 65 | nf_nat_masquerade_ipv4_register_notifier(); |
| 66 | |
| 67 | return ret; |
Arturo Borrero | 9ba1f726 | 2014-09-08 13:45:00 +0200 | [diff] [blame] | 68 | } |
| 69 | |
| 70 | static void __exit nft_masq_ipv4_module_exit(void) |
| 71 | { |
| 72 | nft_unregister_expr(&nft_masq_ipv4_type); |
Arturo Borrero | 8da4cc1 | 2014-10-03 14:13:36 +0200 | [diff] [blame] | 73 | nf_nat_masquerade_ipv4_unregister_notifier(); |
Arturo Borrero | 9ba1f726 | 2014-09-08 13:45:00 +0200 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | module_init(nft_masq_ipv4_module_init); |
| 77 | module_exit(nft_masq_ipv4_module_exit); |
| 78 | |
| 79 | MODULE_LICENSE("GPL"); |
| 80 | MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>"); |
| 81 | MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "masq"); |