1 /*
2 * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
3 *
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.
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_dup_netdev.h>
17
18 struct nft_dup_netdev {
19 enum nft_registers sreg_dev:8;
20 };
21
nft_dup_netdev_eval(const struct nft_expr * expr,struct nft_regs * regs,const struct nft_pktinfo * pkt)22 static void nft_dup_netdev_eval(const struct nft_expr *expr,
23 struct nft_regs *regs,
24 const struct nft_pktinfo *pkt)
25 {
26 struct nft_dup_netdev *priv = nft_expr_priv(expr);
27 int oif = regs->data[priv->sreg_dev];
28
29 nf_dup_netdev_egress(pkt, oif);
30 }
31
32 static const struct nla_policy nft_dup_netdev_policy[NFTA_DUP_MAX + 1] = {
33 [NFTA_DUP_SREG_DEV] = { .type = NLA_U32 },
34 };
35
nft_dup_netdev_init(const struct nft_ctx * ctx,const struct nft_expr * expr,const struct nlattr * const tb[])36 static int nft_dup_netdev_init(const struct nft_ctx *ctx,
37 const struct nft_expr *expr,
38 const struct nlattr * const tb[])
39 {
40 struct nft_dup_netdev *priv = nft_expr_priv(expr);
41
42 if (tb[NFTA_DUP_SREG_DEV] == NULL)
43 return -EINVAL;
44
45 priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
46 return nft_validate_register_load(priv->sreg_dev, sizeof(int));
47 }
48
49 static const struct nft_expr_ops nft_dup_netdev_ingress_ops;
50
nft_dup_netdev_dump(struct sk_buff * skb,const struct nft_expr * expr)51 static int nft_dup_netdev_dump(struct sk_buff *skb, const struct nft_expr *expr)
52 {
53 struct nft_dup_netdev *priv = nft_expr_priv(expr);
54
55 if (nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev))
56 goto nla_put_failure;
57
58 return 0;
59
60 nla_put_failure:
61 return -1;
62 }
63
64 static struct nft_expr_type nft_dup_netdev_type;
65 static const struct nft_expr_ops nft_dup_netdev_ops = {
66 .type = &nft_dup_netdev_type,
67 .size = NFT_EXPR_SIZE(sizeof(struct nft_dup_netdev)),
68 .eval = nft_dup_netdev_eval,
69 .init = nft_dup_netdev_init,
70 .dump = nft_dup_netdev_dump,
71 };
72
73 static struct nft_expr_type nft_dup_netdev_type __read_mostly = {
74 .family = NFPROTO_NETDEV,
75 .name = "dup",
76 .ops = &nft_dup_netdev_ops,
77 .policy = nft_dup_netdev_policy,
78 .maxattr = NFTA_DUP_MAX,
79 .owner = THIS_MODULE,
80 };
81
nft_dup_netdev_module_init(void)82 static int __init nft_dup_netdev_module_init(void)
83 {
84 return nft_register_expr(&nft_dup_netdev_type);
85 }
86
nft_dup_netdev_module_exit(void)87 static void __exit nft_dup_netdev_module_exit(void)
88 {
89 nft_unregister_expr(&nft_dup_netdev_type);
90 }
91
92 module_init(nft_dup_netdev_module_init);
93 module_exit(nft_dup_netdev_module_exit);
94
95 MODULE_LICENSE("GPL");
96 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
97 MODULE_ALIAS_NFT_AF_EXPR(5, "dup");
98
