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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_nat.h> | |
16 | #include <net/netfilter/nf_tables.h> | |
17 | #include <net/netfilter/nft_redir.h> | |
18 | ||
19 | const struct nla_policy nft_redir_policy[NFTA_REDIR_MAX + 1] = { | |
20 | [NFTA_REDIR_REG_PROTO_MIN] = { .type = NLA_U32 }, | |
21 | [NFTA_REDIR_REG_PROTO_MAX] = { .type = NLA_U32 }, | |
22 | [NFTA_REDIR_FLAGS] = { .type = NLA_U32 }, | |
23 | }; | |
24 | EXPORT_SYMBOL_GPL(nft_redir_policy); | |
25 | ||
26 | int nft_redir_init(const struct nft_ctx *ctx, | |
27 | const struct nft_expr *expr, | |
28 | const struct nlattr * const tb[]) | |
29 | { | |
30 | struct nft_redir *priv = nft_expr_priv(expr); | |
e9105f1b AB |
31 | int err; |
32 | ||
33 | err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT); | |
34 | if (err < 0) | |
35 | return err; | |
36 | ||
37 | if (tb[NFTA_REDIR_REG_PROTO_MIN]) { | |
baf4750d PNA |
38 | priv->sreg_proto_min = |
39 | ntohl(nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MIN])); | |
40 | ||
e9105f1b AB |
41 | err = nft_validate_input_register(priv->sreg_proto_min); |
42 | if (err < 0) | |
43 | return err; | |
44 | ||
45 | if (tb[NFTA_REDIR_REG_PROTO_MAX]) { | |
baf4750d PNA |
46 | priv->sreg_proto_max = |
47 | ntohl(nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MAX])); | |
48 | ||
e9105f1b AB |
49 | err = nft_validate_input_register(priv->sreg_proto_max); |
50 | if (err < 0) | |
51 | return err; | |
52 | } else { | |
53 | priv->sreg_proto_max = priv->sreg_proto_min; | |
54 | } | |
55 | } | |
56 | ||
57 | if (tb[NFTA_REDIR_FLAGS]) { | |
58 | priv->flags = ntohl(nla_get_be32(tb[NFTA_REDIR_FLAGS])); | |
59 | if (priv->flags & ~NF_NAT_RANGE_MASK) | |
60 | return -EINVAL; | |
61 | } | |
62 | ||
63 | return 0; | |
64 | } | |
65 | EXPORT_SYMBOL_GPL(nft_redir_init); | |
66 | ||
67 | int nft_redir_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
68 | { | |
69 | const struct nft_redir *priv = nft_expr_priv(expr); | |
70 | ||
71 | if (priv->sreg_proto_min) { | |
72 | if (nla_put_be32(skb, NFTA_REDIR_REG_PROTO_MIN, | |
73 | htonl(priv->sreg_proto_min))) | |
74 | goto nla_put_failure; | |
75 | if (nla_put_be32(skb, NFTA_REDIR_REG_PROTO_MAX, | |
76 | htonl(priv->sreg_proto_max))) | |
77 | goto nla_put_failure; | |
78 | } | |
79 | ||
80 | if (priv->flags != 0 && | |
81 | nla_put_be32(skb, NFTA_REDIR_FLAGS, htonl(priv->flags))) | |
82 | goto nla_put_failure; | |
83 | ||
84 | return 0; | |
85 | ||
86 | nla_put_failure: | |
87 | return -1; | |
88 | } | |
89 | EXPORT_SYMBOL_GPL(nft_redir_dump); | |
90 | ||
91 | int nft_redir_validate(const struct nft_ctx *ctx, const struct nft_expr *expr, | |
92 | const struct nft_data **data) | |
93 | { | |
94 | return nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT); | |
95 | } | |
96 | EXPORT_SYMBOL_GPL(nft_redir_validate); | |
97 | ||
98 | MODULE_LICENSE("GPL"); | |
99 | MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>"); |