2 * Copyright (c) 2008-2009 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/module.h>
14 #include <linux/netlink.h>
15 #include <linux/netfilter.h>
16 #include <linux/netfilter/nf_tables.h>
17 #include <net/netfilter/nf_tables_core.h>
18 #include <net/netfilter/nf_tables.h>
20 struct nft_byteorder
{
21 enum nft_registers sreg
:8;
22 enum nft_registers dreg
:8;
23 enum nft_byteorder_ops op
:8;
28 static void nft_byteorder_eval(const struct nft_expr
*expr
,
29 struct nft_regs
*regs
,
30 const struct nft_pktinfo
*pkt
)
32 const struct nft_byteorder
*priv
= nft_expr_priv(expr
);
33 u32
*src
= ®s
->data
[priv
->sreg
];
34 u32
*dst
= ®s
->data
[priv
->dreg
];
35 union { u32 u32
; u16 u16
; } *s
, *d
;
44 case NFT_BYTEORDER_NTOH
:
45 for (i
= 0; i
< priv
->len
/ 4; i
++)
46 d
[i
].u32
= ntohl((__force __be32
)s
[i
].u32
);
48 case NFT_BYTEORDER_HTON
:
49 for (i
= 0; i
< priv
->len
/ 4; i
++)
50 d
[i
].u32
= (__force __u32
)htonl(s
[i
].u32
);
56 case NFT_BYTEORDER_NTOH
:
57 for (i
= 0; i
< priv
->len
/ 2; i
++)
58 d
[i
].u16
= ntohs((__force __be16
)s
[i
].u16
);
60 case NFT_BYTEORDER_HTON
:
61 for (i
= 0; i
< priv
->len
/ 2; i
++)
62 d
[i
].u16
= (__force __u16
)htons(s
[i
].u16
);
69 static const struct nla_policy nft_byteorder_policy
[NFTA_BYTEORDER_MAX
+ 1] = {
70 [NFTA_BYTEORDER_SREG
] = { .type
= NLA_U32
},
71 [NFTA_BYTEORDER_DREG
] = { .type
= NLA_U32
},
72 [NFTA_BYTEORDER_OP
] = { .type
= NLA_U32
},
73 [NFTA_BYTEORDER_LEN
] = { .type
= NLA_U32
},
74 [NFTA_BYTEORDER_SIZE
] = { .type
= NLA_U32
},
77 static int nft_byteorder_init(const struct nft_ctx
*ctx
,
78 const struct nft_expr
*expr
,
79 const struct nlattr
* const tb
[])
81 struct nft_byteorder
*priv
= nft_expr_priv(expr
);
84 if (tb
[NFTA_BYTEORDER_SREG
] == NULL
||
85 tb
[NFTA_BYTEORDER_DREG
] == NULL
||
86 tb
[NFTA_BYTEORDER_LEN
] == NULL
||
87 tb
[NFTA_BYTEORDER_SIZE
] == NULL
||
88 tb
[NFTA_BYTEORDER_OP
] == NULL
)
91 priv
->op
= ntohl(nla_get_be32(tb
[NFTA_BYTEORDER_OP
]));
93 case NFT_BYTEORDER_NTOH
:
94 case NFT_BYTEORDER_HTON
:
100 priv
->size
= ntohl(nla_get_be32(tb
[NFTA_BYTEORDER_SIZE
]));
101 switch (priv
->size
) {
109 priv
->sreg
= nft_parse_register(tb
[NFTA_BYTEORDER_SREG
]);
110 priv
->len
= ntohl(nla_get_be32(tb
[NFTA_BYTEORDER_LEN
]));
111 err
= nft_validate_register_load(priv
->sreg
, priv
->len
);
115 priv
->dreg
= nft_parse_register(tb
[NFTA_BYTEORDER_DREG
]);
116 return nft_validate_register_store(ctx
, priv
->dreg
, NULL
,
117 NFT_DATA_VALUE
, priv
->len
);
120 static int nft_byteorder_dump(struct sk_buff
*skb
, const struct nft_expr
*expr
)
122 const struct nft_byteorder
*priv
= nft_expr_priv(expr
);
124 if (nft_dump_register(skb
, NFTA_BYTEORDER_SREG
, priv
->sreg
))
125 goto nla_put_failure
;
126 if (nft_dump_register(skb
, NFTA_BYTEORDER_DREG
, priv
->dreg
))
127 goto nla_put_failure
;
128 if (nla_put_be32(skb
, NFTA_BYTEORDER_OP
, htonl(priv
->op
)))
129 goto nla_put_failure
;
130 if (nla_put_be32(skb
, NFTA_BYTEORDER_LEN
, htonl(priv
->len
)))
131 goto nla_put_failure
;
132 if (nla_put_be32(skb
, NFTA_BYTEORDER_SIZE
, htonl(priv
->size
)))
133 goto nla_put_failure
;
140 static struct nft_expr_type nft_byteorder_type
;
141 static const struct nft_expr_ops nft_byteorder_ops
= {
142 .type
= &nft_byteorder_type
,
143 .size
= NFT_EXPR_SIZE(sizeof(struct nft_byteorder
)),
144 .eval
= nft_byteorder_eval
,
145 .init
= nft_byteorder_init
,
146 .dump
= nft_byteorder_dump
,
149 static struct nft_expr_type nft_byteorder_type __read_mostly
= {
151 .ops
= &nft_byteorder_ops
,
152 .policy
= nft_byteorder_policy
,
153 .maxattr
= NFTA_BYTEORDER_MAX
,
154 .owner
= THIS_MODULE
,
157 int __init
nft_byteorder_module_init(void)
159 return nft_register_expr(&nft_byteorder_type
);
162 void nft_byteorder_module_exit(void)
164 nft_unregister_expr(&nft_byteorder_type
);