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>
19 #include <net/netfilter/nf_tables_core.h>
23 enum nft_registers sreg
:8;
24 enum nft_registers dreg
:8;
25 struct nft_set_binding binding
;
28 static void nft_lookup_eval(const struct nft_expr
*expr
,
29 struct nft_data data
[NFT_REG_MAX
+ 1],
30 const struct nft_pktinfo
*pkt
)
32 const struct nft_lookup
*priv
= nft_expr_priv(expr
);
33 const struct nft_set
*set
= priv
->set
;
35 if (set
->ops
->lookup(set
, &data
[priv
->sreg
], &data
[priv
->dreg
]))
37 data
[NFT_REG_VERDICT
].verdict
= NFT_BREAK
;
40 static const struct nla_policy nft_lookup_policy
[NFTA_LOOKUP_MAX
+ 1] = {
41 [NFTA_LOOKUP_SET
] = { .type
= NLA_STRING
},
42 [NFTA_LOOKUP_SET_ID
] = { .type
= NLA_U32
},
43 [NFTA_LOOKUP_SREG
] = { .type
= NLA_U32
},
44 [NFTA_LOOKUP_DREG
] = { .type
= NLA_U32
},
47 static int nft_lookup_init(const struct nft_ctx
*ctx
,
48 const struct nft_expr
*expr
,
49 const struct nlattr
* const tb
[])
51 struct nft_lookup
*priv
= nft_expr_priv(expr
);
55 if (tb
[NFTA_LOOKUP_SET
] == NULL
||
56 tb
[NFTA_LOOKUP_SREG
] == NULL
)
59 set
= nf_tables_set_lookup(ctx
->table
, tb
[NFTA_LOOKUP_SET
]);
61 if (tb
[NFTA_LOOKUP_SET_ID
]) {
62 set
= nf_tables_set_lookup_byid(ctx
->net
,
63 tb
[NFTA_LOOKUP_SET_ID
]);
69 priv
->sreg
= ntohl(nla_get_be32(tb
[NFTA_LOOKUP_SREG
]));
70 err
= nft_validate_input_register(priv
->sreg
);
74 if (tb
[NFTA_LOOKUP_DREG
] != NULL
) {
75 if (!(set
->flags
& NFT_SET_MAP
))
78 priv
->dreg
= ntohl(nla_get_be32(tb
[NFTA_LOOKUP_DREG
]));
79 err
= nft_validate_output_register(priv
->dreg
);
83 if (priv
->dreg
== NFT_REG_VERDICT
) {
84 if (set
->dtype
!= NFT_DATA_VERDICT
)
86 } else if (set
->dtype
== NFT_DATA_VERDICT
)
88 } else if (set
->flags
& NFT_SET_MAP
)
91 err
= nf_tables_bind_set(ctx
, set
, &priv
->binding
);
99 static void nft_lookup_destroy(const struct nft_ctx
*ctx
,
100 const struct nft_expr
*expr
)
102 struct nft_lookup
*priv
= nft_expr_priv(expr
);
104 nf_tables_unbind_set(ctx
, priv
->set
, &priv
->binding
);
107 static int nft_lookup_dump(struct sk_buff
*skb
, const struct nft_expr
*expr
)
109 const struct nft_lookup
*priv
= nft_expr_priv(expr
);
111 if (nla_put_string(skb
, NFTA_LOOKUP_SET
, priv
->set
->name
))
112 goto nla_put_failure
;
113 if (nla_put_be32(skb
, NFTA_LOOKUP_SREG
, htonl(priv
->sreg
)))
114 goto nla_put_failure
;
115 if (priv
->set
->flags
& NFT_SET_MAP
)
116 if (nla_put_be32(skb
, NFTA_LOOKUP_DREG
, htonl(priv
->dreg
)))
117 goto nla_put_failure
;
124 static struct nft_expr_type nft_lookup_type
;
125 static const struct nft_expr_ops nft_lookup_ops
= {
126 .type
= &nft_lookup_type
,
127 .size
= NFT_EXPR_SIZE(sizeof(struct nft_lookup
)),
128 .eval
= nft_lookup_eval
,
129 .init
= nft_lookup_init
,
130 .destroy
= nft_lookup_destroy
,
131 .dump
= nft_lookup_dump
,
134 static struct nft_expr_type nft_lookup_type __read_mostly
= {
136 .ops
= &nft_lookup_ops
,
137 .policy
= nft_lookup_policy
,
138 .maxattr
= NFTA_LOOKUP_MAX
,
139 .owner
= THIS_MODULE
,
142 int __init
nft_lookup_module_init(void)
144 return nft_register_expr(&nft_lookup_type
);
147 void nft_lookup_module_exit(void)
149 nft_unregister_expr(&nft_lookup_type
);