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e9105f1b AB |
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> | |
17 | #include <net/netfilter/nft_redir.h> | |
b59eaf9e | 18 | #include <net/netfilter/nf_nat_redirect.h> |
e9105f1b AB |
19 | |
20 | static void nft_redir_ipv6_eval(const struct nft_expr *expr, | |
21 | struct nft_data data[NFT_REG_MAX + 1], | |
22 | const struct nft_pktinfo *pkt) | |
23 | { | |
24 | struct nft_redir *priv = nft_expr_priv(expr); | |
25 | struct nf_nat_range range; | |
26 | unsigned int verdict; | |
27 | ||
28 | memset(&range, 0, sizeof(range)); | |
29 | if (priv->sreg_proto_min) { | |
7b5bca46 | 30 | range.min_proto.all = |
31 | *(__be16 *)&data[priv->sreg_proto_min].data[0]; | |
32 | range.max_proto.all = | |
33 | *(__be16 *)&data[priv->sreg_proto_max].data[0]; | |
e9105f1b AB |
34 | range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; |
35 | } | |
36 | ||
37 | range.flags |= priv->flags; | |
38 | ||
39 | verdict = nf_nat_redirect_ipv6(pkt->skb, &range, pkt->ops->hooknum); | |
40 | data[NFT_REG_VERDICT].verdict = verdict; | |
41 | } | |
42 | ||
43 | static struct nft_expr_type nft_redir_ipv6_type; | |
44 | static const struct nft_expr_ops nft_redir_ipv6_ops = { | |
45 | .type = &nft_redir_ipv6_type, | |
46 | .size = NFT_EXPR_SIZE(sizeof(struct nft_redir)), | |
47 | .eval = nft_redir_ipv6_eval, | |
48 | .init = nft_redir_init, | |
49 | .dump = nft_redir_dump, | |
50 | .validate = nft_redir_validate, | |
51 | }; | |
52 | ||
53 | static struct nft_expr_type nft_redir_ipv6_type __read_mostly = { | |
54 | .family = NFPROTO_IPV6, | |
55 | .name = "redir", | |
56 | .ops = &nft_redir_ipv6_ops, | |
57 | .policy = nft_redir_policy, | |
58 | .maxattr = NFTA_REDIR_MAX, | |
59 | .owner = THIS_MODULE, | |
60 | }; | |
61 | ||
62 | static int __init nft_redir_ipv6_module_init(void) | |
63 | { | |
64 | return nft_register_expr(&nft_redir_ipv6_type); | |
65 | } | |
66 | ||
67 | static void __exit nft_redir_ipv6_module_exit(void) | |
68 | { | |
69 | nft_unregister_expr(&nft_redir_ipv6_type); | |
70 | } | |
71 | ||
72 | module_init(nft_redir_ipv6_module_init); | |
73 | module_exit(nft_redir_ipv6_module_exit); | |
74 | ||
75 | MODULE_LICENSE("GPL"); | |
76 | MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>"); | |
77 | MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "redir"); |