2 * Copyright (c) 2009 Patrick McHardy <kaber@trash.net>
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.
8 * Development of this code funded by Astaro AG (http://www.astaro.com/)
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/rbtree.h>
15 #include <linux/netlink.h>
16 #include <linux/netfilter.h>
17 #include <linux/netfilter/nf_tables.h>
18 #include <net/netfilter/nf_tables.h>
22 enum nft_registers sreg
:8;
23 enum nft_registers dreg
:8;
24 struct nft_set_binding binding
;
27 static void nft_lookup_eval(const struct nft_expr
*expr
,
28 struct nft_data data
[NFT_REG_MAX
+ 1],
29 const struct nft_pktinfo
*pkt
)
31 const struct nft_lookup
*priv
= nft_expr_priv(expr
);
32 const struct nft_set
*set
= priv
->set
;
34 if (set
->ops
->lookup(set
, &data
[priv
->sreg
], &data
[priv
->dreg
]))
36 data
[NFT_REG_VERDICT
].verdict
= NFT_BREAK
;
39 static const struct nla_policy nft_lookup_policy
[NFTA_LOOKUP_MAX
+ 1] = {
40 [NFTA_LOOKUP_SET
] = { .type
= NLA_STRING
},
41 [NFTA_LOOKUP_SREG
] = { .type
= NLA_U32
},
42 [NFTA_LOOKUP_DREG
] = { .type
= NLA_U32
},
45 static int nft_lookup_init(const struct nft_ctx
*ctx
,
46 const struct nft_expr
*expr
,
47 const struct nlattr
* const tb
[])
49 struct nft_lookup
*priv
= nft_expr_priv(expr
);
53 if (tb
[NFTA_LOOKUP_SET
] == NULL
||
54 tb
[NFTA_LOOKUP_SREG
] == NULL
)
57 set
= nf_tables_set_lookup(ctx
->table
, tb
[NFTA_LOOKUP_SET
]);
61 priv
->sreg
= ntohl(nla_get_be32(tb
[NFTA_LOOKUP_SREG
]));
62 err
= nft_validate_input_register(priv
->sreg
);
66 if (tb
[NFTA_LOOKUP_DREG
] != NULL
) {
67 if (!(set
->flags
& NFT_SET_MAP
))
70 priv
->dreg
= ntohl(nla_get_be32(tb
[NFTA_LOOKUP_DREG
]));
71 err
= nft_validate_output_register(priv
->dreg
);
75 if (priv
->dreg
== NFT_REG_VERDICT
) {
76 if (set
->dtype
!= NFT_DATA_VERDICT
)
78 } else if (set
->dtype
== NFT_DATA_VERDICT
)
80 } else if (set
->flags
& NFT_SET_MAP
)
83 err
= nf_tables_bind_set(ctx
, set
, &priv
->binding
);
91 static void nft_lookup_destroy(const struct nft_expr
*expr
)
93 struct nft_lookup
*priv
= nft_expr_priv(expr
);
95 nf_tables_unbind_set(NULL
, priv
->set
, &priv
->binding
);
98 static int nft_lookup_dump(struct sk_buff
*skb
, const struct nft_expr
*expr
)
100 const struct nft_lookup
*priv
= nft_expr_priv(expr
);
102 if (nla_put_string(skb
, NFTA_LOOKUP_SET
, priv
->set
->name
))
103 goto nla_put_failure
;
104 if (nla_put_be32(skb
, NFTA_LOOKUP_SREG
, htonl(priv
->sreg
)))
105 goto nla_put_failure
;
106 if (priv
->set
->flags
& NFT_SET_MAP
)
107 if (nla_put_be32(skb
, NFTA_LOOKUP_DREG
, htonl(priv
->dreg
)))
108 goto nla_put_failure
;
115 static struct nft_expr_type nft_lookup_type
;
116 static const struct nft_expr_ops nft_lookup_ops
= {
117 .type
= &nft_lookup_type
,
118 .size
= NFT_EXPR_SIZE(sizeof(struct nft_lookup
)),
119 .eval
= nft_lookup_eval
,
120 .init
= nft_lookup_init
,
121 .destroy
= nft_lookup_destroy
,
122 .dump
= nft_lookup_dump
,
125 static struct nft_expr_type nft_lookup_type __read_mostly
= {
127 .ops
= &nft_lookup_ops
,
128 .policy
= nft_lookup_policy
,
129 .maxattr
= NFTA_LOOKUP_MAX
,
130 .owner
= THIS_MODULE
,
133 int __init
nft_lookup_module_init(void)
135 return nft_register_expr(&nft_lookup_type
);
138 void nft_lookup_module_exit(void)
140 nft_unregister_expr(&nft_lookup_type
);