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Commit | Line | Data |
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e9105f1b | 1 | /* |
cd727514 | 2 | * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org> |
e9105f1b 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_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 | ||
75e8d06d PNA |
26 | int nft_redir_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_PRE_ROUTING) | | |
38 | (1 << NF_INET_LOCAL_OUT)); | |
39 | } | |
40 | EXPORT_SYMBOL_GPL(nft_redir_validate); | |
41 | ||
e9105f1b AB |
42 | int nft_redir_init(const struct nft_ctx *ctx, |
43 | const struct nft_expr *expr, | |
44 | const struct nlattr * const tb[]) | |
45 | { | |
46 | struct nft_redir *priv = nft_expr_priv(expr); | |
d07db988 | 47 | unsigned int plen; |
e9105f1b AB |
48 | int err; |
49 | ||
d07db988 | 50 | plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all); |
e9105f1b | 51 | if (tb[NFTA_REDIR_REG_PROTO_MIN]) { |
baf4750d | 52 | priv->sreg_proto_min = |
b1c96ed3 | 53 | nft_parse_register(tb[NFTA_REDIR_REG_PROTO_MIN]); |
baf4750d | 54 | |
d07db988 | 55 | err = nft_validate_register_load(priv->sreg_proto_min, plen); |
e9105f1b AB |
56 | if (err < 0) |
57 | return err; | |
58 | ||
59 | if (tb[NFTA_REDIR_REG_PROTO_MAX]) { | |
baf4750d | 60 | priv->sreg_proto_max = |
b1c96ed3 | 61 | nft_parse_register(tb[NFTA_REDIR_REG_PROTO_MAX]); |
baf4750d | 62 | |
d07db988 PM |
63 | err = nft_validate_register_load(priv->sreg_proto_max, |
64 | plen); | |
e9105f1b AB |
65 | if (err < 0) |
66 | return err; | |
67 | } else { | |
68 | priv->sreg_proto_max = priv->sreg_proto_min; | |
69 | } | |
70 | } | |
71 | ||
72 | if (tb[NFTA_REDIR_FLAGS]) { | |
73 | priv->flags = ntohl(nla_get_be32(tb[NFTA_REDIR_FLAGS])); | |
74 | if (priv->flags & ~NF_NAT_RANGE_MASK) | |
75 | return -EINVAL; | |
76 | } | |
77 | ||
20afd423 | 78 | return nf_ct_netns_get(ctx->net, ctx->afi->family); |
e9105f1b AB |
79 | } |
80 | EXPORT_SYMBOL_GPL(nft_redir_init); | |
81 | ||
82 | int nft_redir_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
83 | { | |
84 | const struct nft_redir *priv = nft_expr_priv(expr); | |
85 | ||
86 | if (priv->sreg_proto_min) { | |
b1c96ed3 PM |
87 | if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MIN, |
88 | priv->sreg_proto_min)) | |
e9105f1b | 89 | goto nla_put_failure; |
b1c96ed3 PM |
90 | if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MAX, |
91 | priv->sreg_proto_max)) | |
e9105f1b AB |
92 | goto nla_put_failure; |
93 | } | |
94 | ||
95 | if (priv->flags != 0 && | |
96 | nla_put_be32(skb, NFTA_REDIR_FLAGS, htonl(priv->flags))) | |
97 | goto nla_put_failure; | |
98 | ||
99 | return 0; | |
100 | ||
101 | nla_put_failure: | |
102 | return -1; | |
103 | } | |
104 | EXPORT_SYMBOL_GPL(nft_redir_dump); | |
105 | ||
e9105f1b | 106 | MODULE_LICENSE("GPL"); |
cd727514 | 107 | MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>"); |