2 * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published by
6 * the Free Software Foundation.
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/ipv6/nf_dup_ipv6.h>
19 enum nft_registers sreg_addr:8;
20 enum nft_registers sreg_dev:8;
23 static void nft_dup_ipv6_eval(const struct nft_expr *expr,
24 struct nft_regs *regs,
25 const struct nft_pktinfo *pkt)
27 struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
28 struct in6_addr *gw = (struct in6_addr *)®s->data[priv->sreg_addr];
29 int oif = priv->sreg_dev ? regs->data[priv->sreg_dev] : -1;
31 nf_dup_ipv6(pkt->net, pkt->skb, pkt->hook, gw, oif);
34 static int nft_dup_ipv6_init(const struct nft_ctx *ctx,
35 const struct nft_expr *expr,
36 const struct nlattr * const tb[])
38 struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
41 if (tb[NFTA_DUP_SREG_ADDR] == NULL)
44 priv->sreg_addr = nft_parse_register(tb[NFTA_DUP_SREG_ADDR]);
45 err = nft_validate_register_load(priv->sreg_addr, sizeof(struct in6_addr));
49 if (tb[NFTA_DUP_SREG_DEV] != NULL) {
50 priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
51 return nft_validate_register_load(priv->sreg_dev, sizeof(int));
56 static int nft_dup_ipv6_dump(struct sk_buff *skb, const struct nft_expr *expr)
58 struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
60 if (nft_dump_register(skb, NFTA_DUP_SREG_ADDR, priv->sreg_addr))
63 nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev))
72 static struct nft_expr_type nft_dup_ipv6_type;
73 static const struct nft_expr_ops nft_dup_ipv6_ops = {
74 .type = &nft_dup_ipv6_type,
75 .size = NFT_EXPR_SIZE(sizeof(struct nft_dup_ipv6)),
76 .eval = nft_dup_ipv6_eval,
77 .init = nft_dup_ipv6_init,
78 .dump = nft_dup_ipv6_dump,
81 static const struct nla_policy nft_dup_ipv6_policy[NFTA_DUP_MAX + 1] = {
82 [NFTA_DUP_SREG_ADDR] = { .type = NLA_U32 },
83 [NFTA_DUP_SREG_DEV] = { .type = NLA_U32 },
86 static struct nft_expr_type nft_dup_ipv6_type __read_mostly = {
87 .family = NFPROTO_IPV6,
89 .ops = &nft_dup_ipv6_ops,
90 .policy = nft_dup_ipv6_policy,
91 .maxattr = NFTA_DUP_MAX,
95 static int __init nft_dup_ipv6_module_init(void)
97 return nft_register_expr(&nft_dup_ipv6_type);
100 static void __exit nft_dup_ipv6_module_exit(void)
102 nft_unregister_expr(&nft_dup_ipv6_type);
105 module_init(nft_dup_ipv6_module_init);
106 module_exit(nft_dup_ipv6_module_exit);
108 MODULE_LICENSE("GPL");
109 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
110 MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "dup");