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e9105f1b | 1 | /* |
cd727514 | 2 | * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org> |
e9105f1b AB |
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> | |
b59eaf9e | 17 | #include <net/netfilter/nf_nat_redirect.h> |
e9105f1b AB |
18 | #include <net/netfilter/nft_redir.h> |
19 | ||
20 | static void nft_redir_ipv4_eval(const struct nft_expr *expr, | |
a55e22e9 | 21 | struct nft_regs *regs, |
e9105f1b AB |
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; | |
e9105f1b AB |
26 | |
27 | memset(&mr, 0, sizeof(mr)); | |
28 | if (priv->sreg_proto_min) { | |
10596608 LZ |
29 | mr.range[0].min.all = (__force __be16)nft_reg_load16( |
30 | ®s->data[priv->sreg_proto_min]); | |
31 | mr.range[0].max.all = (__force __be16)nft_reg_load16( | |
32 | ®s->data[priv->sreg_proto_max]); | |
e9105f1b AB |
33 | mr.range[0].flags |= NF_NAT_RANGE_PROTO_SPECIFIED; |
34 | } | |
35 | ||
36 | mr.range[0].flags |= priv->flags; | |
37 | ||
0e5a1c7e | 38 | regs->verdict.code = nf_nat_redirect_ipv4(pkt->skb, &mr, nft_hook(pkt)); |
e9105f1b AB |
39 | } |
40 | ||
20afd423 FW |
41 | static void |
42 | nft_redir_ipv4_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr) | |
43 | { | |
44 | nf_ct_netns_put(ctx->net, NFPROTO_IPV4); | |
45 | } | |
46 | ||
e9105f1b AB |
47 | static struct nft_expr_type nft_redir_ipv4_type; |
48 | static const struct nft_expr_ops nft_redir_ipv4_ops = { | |
49 | .type = &nft_redir_ipv4_type, | |
50 | .size = NFT_EXPR_SIZE(sizeof(struct nft_redir)), | |
51 | .eval = nft_redir_ipv4_eval, | |
52 | .init = nft_redir_init, | |
20afd423 | 53 | .destroy = nft_redir_ipv4_destroy, |
e9105f1b AB |
54 | .dump = nft_redir_dump, |
55 | .validate = nft_redir_validate, | |
56 | }; | |
57 | ||
58 | static struct nft_expr_type nft_redir_ipv4_type __read_mostly = { | |
59 | .family = NFPROTO_IPV4, | |
60 | .name = "redir", | |
61 | .ops = &nft_redir_ipv4_ops, | |
62 | .policy = nft_redir_policy, | |
63 | .maxattr = NFTA_REDIR_MAX, | |
64 | .owner = THIS_MODULE, | |
65 | }; | |
66 | ||
67 | static int __init nft_redir_ipv4_module_init(void) | |
68 | { | |
69 | return nft_register_expr(&nft_redir_ipv4_type); | |
70 | } | |
71 | ||
72 | static void __exit nft_redir_ipv4_module_exit(void) | |
73 | { | |
74 | nft_unregister_expr(&nft_redir_ipv4_type); | |
75 | } | |
76 | ||
77 | module_init(nft_redir_ipv4_module_init); | |
78 | module_exit(nft_redir_ipv4_module_exit); | |
79 | ||
80 | MODULE_LICENSE("GPL"); | |
cd727514 | 81 | MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>"); |
e9105f1b | 82 | MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "redir"); |