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Commit | Line | Data |
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9ba1f726 | 1 | /* |
cd727514 | 2 | * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org> |
9ba1f726 AB |
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 | ||
19 | const struct nla_policy nft_masq_policy[NFTA_MASQ_MAX + 1] = { | |
8a6bf5da PNA |
20 | [NFTA_MASQ_FLAGS] = { .type = NLA_U32 }, |
21 | [NFTA_MASQ_REG_PROTO_MIN] = { .type = NLA_U32 }, | |
22 | [NFTA_MASQ_REG_PROTO_MAX] = { .type = NLA_U32 }, | |
9ba1f726 AB |
23 | }; |
24 | EXPORT_SYMBOL_GPL(nft_masq_policy); | |
25 | ||
75e8d06d PNA |
26 | int nft_masq_validate(const struct nft_ctx *ctx, |
27 | const struct nft_expr *expr, | |
28 | const struct nft_data **data) | |
29 | { | |
30 | int err; | |
31 | ||
32 | err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT); | |
33 | if (err < 0) | |
34 | return err; | |
35 | ||
36 | return nft_chain_validate_hooks(ctx->chain, | |
37 | (1 << NF_INET_POST_ROUTING)); | |
38 | } | |
39 | EXPORT_SYMBOL_GPL(nft_masq_validate); | |
40 | ||
9ba1f726 AB |
41 | int nft_masq_init(const struct nft_ctx *ctx, |
42 | const struct nft_expr *expr, | |
43 | const struct nlattr * const tb[]) | |
44 | { | |
8a6bf5da | 45 | u32 plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all); |
9ba1f726 | 46 | struct nft_masq *priv = nft_expr_priv(expr); |
7210e4e3 PNA |
47 | int err; |
48 | ||
75e8d06d PNA |
49 | err = nft_masq_validate(ctx, expr, NULL); |
50 | if (err) | |
7210e4e3 | 51 | return err; |
9ba1f726 | 52 | |
8a6bf5da PNA |
53 | if (tb[NFTA_MASQ_FLAGS]) { |
54 | priv->flags = ntohl(nla_get_be32(tb[NFTA_MASQ_FLAGS])); | |
55 | if (priv->flags & ~NF_NAT_RANGE_MASK) | |
56 | return -EINVAL; | |
57 | } | |
58 | ||
59 | if (tb[NFTA_MASQ_REG_PROTO_MIN]) { | |
60 | priv->sreg_proto_min = | |
61 | nft_parse_register(tb[NFTA_MASQ_REG_PROTO_MIN]); | |
62 | ||
63 | err = nft_validate_register_load(priv->sreg_proto_min, plen); | |
64 | if (err < 0) | |
65 | return err; | |
66 | ||
67 | if (tb[NFTA_MASQ_REG_PROTO_MAX]) { | |
68 | priv->sreg_proto_max = | |
69 | nft_parse_register(tb[NFTA_MASQ_REG_PROTO_MAX]); | |
70 | ||
71 | err = nft_validate_register_load(priv->sreg_proto_max, | |
72 | plen); | |
73 | if (err < 0) | |
74 | return err; | |
75 | } else { | |
76 | priv->sreg_proto_max = priv->sreg_proto_min; | |
77 | } | |
78 | } | |
9ba1f726 | 79 | |
20afd423 | 80 | return nf_ct_netns_get(ctx->net, ctx->afi->family); |
9ba1f726 AB |
81 | } |
82 | EXPORT_SYMBOL_GPL(nft_masq_init); | |
83 | ||
84 | int nft_masq_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
85 | { | |
86 | const struct nft_masq *priv = nft_expr_priv(expr); | |
87 | ||
8a6bf5da PNA |
88 | if (priv->flags != 0 && |
89 | nla_put_be32(skb, NFTA_MASQ_FLAGS, htonl(priv->flags))) | |
9ba1f726 AB |
90 | goto nla_put_failure; |
91 | ||
8a6bf5da PNA |
92 | if (priv->sreg_proto_min) { |
93 | if (nft_dump_register(skb, NFTA_MASQ_REG_PROTO_MIN, | |
94 | priv->sreg_proto_min) || | |
95 | nft_dump_register(skb, NFTA_MASQ_REG_PROTO_MAX, | |
96 | priv->sreg_proto_max)) | |
97 | goto nla_put_failure; | |
98 | } | |
99 | ||
9ba1f726 AB |
100 | return 0; |
101 | ||
102 | nla_put_failure: | |
103 | return -1; | |
104 | } | |
105 | EXPORT_SYMBOL_GPL(nft_masq_dump); | |
106 | ||
107 | MODULE_LICENSE("GPL"); | |
cd727514 | 108 | MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>"); |