1 /*
2 * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org>
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_masq.h>
18 #include <net/netfilter/ipv6/nf_nat_masquerade.h>
19
nft_masq_ipv6_eval(const struct nft_expr * expr,struct nft_regs * regs,const struct nft_pktinfo * pkt)20 static void nft_masq_ipv6_eval(const struct nft_expr *expr,
21 struct nft_regs *regs,
22 const struct nft_pktinfo *pkt)
23 {
24 struct nft_masq *priv = nft_expr_priv(expr);
25 struct nf_nat_range range;
26
27 memset(&range, 0, sizeof(range));
28 range.flags = priv->flags;
29 if (priv->sreg_proto_min) {
30 range.min_proto.all = (__force __be16)nft_reg_load16(
31 ®s->data[priv->sreg_proto_min]);
32 range.max_proto.all = (__force __be16)nft_reg_load16(
33 ®s->data[priv->sreg_proto_max]);
34 }
35 regs->verdict.code = nf_nat_masquerade_ipv6(pkt->skb, &range,
36 nft_out(pkt));
37 }
38
39 static void
nft_masq_ipv6_destroy(const struct nft_ctx * ctx,const struct nft_expr * expr)40 nft_masq_ipv6_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
41 {
42 nf_ct_netns_put(ctx->net, NFPROTO_IPV6);
43 }
44
45 static struct nft_expr_type nft_masq_ipv6_type;
46 static const struct nft_expr_ops nft_masq_ipv6_ops = {
47 .type = &nft_masq_ipv6_type,
48 .size = NFT_EXPR_SIZE(sizeof(struct nft_masq)),
49 .eval = nft_masq_ipv6_eval,
50 .init = nft_masq_init,
51 .destroy = nft_masq_ipv6_destroy,
52 .dump = nft_masq_dump,
53 .validate = nft_masq_validate,
54 };
55
56 static struct nft_expr_type nft_masq_ipv6_type __read_mostly = {
57 .family = NFPROTO_IPV6,
58 .name = "masq",
59 .ops = &nft_masq_ipv6_ops,
60 .policy = nft_masq_policy,
61 .maxattr = NFTA_MASQ_MAX,
62 .owner = THIS_MODULE,
63 };
64
nft_masq_ipv6_module_init(void)65 static int __init nft_masq_ipv6_module_init(void)
66 {
67 int ret;
68
69 ret = nft_register_expr(&nft_masq_ipv6_type);
70 if (ret < 0)
71 return ret;
72
73 nf_nat_masquerade_ipv6_register_notifier();
74
75 return ret;
76 }
77
nft_masq_ipv6_module_exit(void)78 static void __exit nft_masq_ipv6_module_exit(void)
79 {
80 nft_unregister_expr(&nft_masq_ipv6_type);
81 nf_nat_masquerade_ipv6_unregister_notifier();
82 }
83
84 module_init(nft_masq_ipv6_module_init);
85 module_exit(nft_masq_ipv6_module_exit);
86
87 MODULE_LICENSE("GPL");
88 MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>");
89 MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "masq");
90