tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org>
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
19const struct nla_policy nft_masq_policy[NFTA_MASQ_MAX + 1] = {
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 },
23};
24EXPORT_SYMBOL_GPL(nft_masq_policy);
25
26int 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}
39EXPORT_SYMBOL_GPL(nft_masq_validate);
40
41int nft_masq_init(const struct nft_ctx *ctx,
42 const struct nft_expr *expr,
43 const struct nlattr * const tb[])
44{
45 u32 plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
46 struct nft_masq *priv = nft_expr_priv(expr);
47 int err;
48
49 if (tb[NFTA_MASQ_FLAGS]) {
50 priv->flags = ntohl(nla_get_be32(tb[NFTA_MASQ_FLAGS]));
51 if (priv->flags & ~NF_NAT_RANGE_MASK)
52 return -EINVAL;
53 }
54
55 if (tb[NFTA_MASQ_REG_PROTO_MIN]) {
56 priv->sreg_proto_min =
57 nft_parse_register(tb[NFTA_MASQ_REG_PROTO_MIN]);
58
59 err = nft_validate_register_load(priv->sreg_proto_min, plen);
60 if (err < 0)
61 return err;
62
63 if (tb[NFTA_MASQ_REG_PROTO_MAX]) {
64 priv->sreg_proto_max =
65 nft_parse_register(tb[NFTA_MASQ_REG_PROTO_MAX]);
66
67 err = nft_validate_register_load(priv->sreg_proto_max,
68 plen);
69 if (err < 0)
70 return err;
71 } else {
72 priv->sreg_proto_max = priv->sreg_proto_min;
73 }
74 }
75
76 return nf_ct_netns_get(ctx->net, ctx->afi->family);
77}
78EXPORT_SYMBOL_GPL(nft_masq_init);
79
80int nft_masq_dump(struct sk_buff *skb, const struct nft_expr *expr)
81{
82 const struct nft_masq *priv = nft_expr_priv(expr);
83
84 if (priv->flags != 0 &&
85 nla_put_be32(skb, NFTA_MASQ_FLAGS, htonl(priv->flags)))
86 goto nla_put_failure;
87
88 if (priv->sreg_proto_min) {
89 if (nft_dump_register(skb, NFTA_MASQ_REG_PROTO_MIN,
90 priv->sreg_proto_min) ||
91 nft_dump_register(skb, NFTA_MASQ_REG_PROTO_MAX,
92 priv->sreg_proto_max))
93 goto nla_put_failure;
94 }
95
96 return 0;
97
98nla_put_failure:
99 return -1;
100}
101EXPORT_SYMBOL_GPL(nft_masq_dump);
102
103MODULE_LICENSE("GPL");
104MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>");