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>
19 #include <net/tcp_states.h> /* for TCP_TIME_WAIT */
20 #include <net/netfilter/nf_tables.h>
21 #include <net/netfilter/nft_meta.h>
23 void nft_meta_get_eval(const struct nft_expr
*expr
,
24 struct nft_data data
[NFT_REG_MAX
+ 1],
25 const struct nft_pktinfo
*pkt
)
27 const struct nft_meta
*priv
= nft_expr_priv(expr
);
28 const struct sk_buff
*skb
= pkt
->skb
;
29 const struct net_device
*in
= pkt
->in
, *out
= pkt
->out
;
30 struct nft_data
*dest
= &data
[priv
->dreg
];
34 dest
->data
[0] = skb
->len
;
36 case NFT_META_PROTOCOL
:
37 *(__be16
*)dest
->data
= skb
->protocol
;
39 case NFT_META_NFPROTO
:
40 dest
->data
[0] = pkt
->ops
->pf
;
42 case NFT_META_L4PROTO
:
43 dest
->data
[0] = pkt
->tprot
;
45 case NFT_META_PRIORITY
:
46 dest
->data
[0] = skb
->priority
;
49 dest
->data
[0] = skb
->mark
;
54 dest
->data
[0] = in
->ifindex
;
59 dest
->data
[0] = out
->ifindex
;
61 case NFT_META_IIFNAME
:
64 strncpy((char *)dest
->data
, in
->name
, sizeof(dest
->data
));
66 case NFT_META_OIFNAME
:
69 strncpy((char *)dest
->data
, out
->name
, sizeof(dest
->data
));
71 case NFT_META_IIFTYPE
:
74 *(u16
*)dest
->data
= in
->type
;
76 case NFT_META_OIFTYPE
:
79 *(u16
*)dest
->data
= out
->type
;
82 if (skb
->sk
== NULL
|| skb
->sk
->sk_state
== TCP_TIME_WAIT
)
85 read_lock_bh(&skb
->sk
->sk_callback_lock
);
86 if (skb
->sk
->sk_socket
== NULL
||
87 skb
->sk
->sk_socket
->file
== NULL
) {
88 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
93 from_kuid_munged(&init_user_ns
,
94 skb
->sk
->sk_socket
->file
->f_cred
->fsuid
);
95 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
98 if (skb
->sk
== NULL
|| skb
->sk
->sk_state
== TCP_TIME_WAIT
)
101 read_lock_bh(&skb
->sk
->sk_callback_lock
);
102 if (skb
->sk
->sk_socket
== NULL
||
103 skb
->sk
->sk_socket
->file
== NULL
) {
104 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
108 from_kgid_munged(&init_user_ns
,
109 skb
->sk
->sk_socket
->file
->f_cred
->fsgid
);
110 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
112 #ifdef CONFIG_IP_ROUTE_CLASSID
113 case NFT_META_RTCLASSID
: {
114 const struct dst_entry
*dst
= skb_dst(skb
);
118 dest
->data
[0] = dst
->tclassid
;
122 #ifdef CONFIG_NETWORK_SECMARK
123 case NFT_META_SECMARK
:
124 dest
->data
[0] = skb
->secmark
;
134 data
[NFT_REG_VERDICT
].verdict
= NFT_BREAK
;
136 EXPORT_SYMBOL_GPL(nft_meta_get_eval
);
138 void nft_meta_set_eval(const struct nft_expr
*expr
,
139 struct nft_data data
[NFT_REG_MAX
+ 1],
140 const struct nft_pktinfo
*pkt
)
142 const struct nft_meta
*meta
= nft_expr_priv(expr
);
143 struct sk_buff
*skb
= pkt
->skb
;
144 u32 value
= data
[meta
->sreg
].data
[0];
150 case NFT_META_PRIORITY
:
151 skb
->priority
= value
;
153 case NFT_META_NFTRACE
:
160 EXPORT_SYMBOL_GPL(nft_meta_set_eval
);
162 const struct nla_policy nft_meta_policy
[NFTA_META_MAX
+ 1] = {
163 [NFTA_META_DREG
] = { .type
= NLA_U32
},
164 [NFTA_META_KEY
] = { .type
= NLA_U32
},
165 [NFTA_META_SREG
] = { .type
= NLA_U32
},
167 EXPORT_SYMBOL_GPL(nft_meta_policy
);
169 int nft_meta_get_init(const struct nft_ctx
*ctx
,
170 const struct nft_expr
*expr
,
171 const struct nlattr
* const tb
[])
173 struct nft_meta
*priv
= nft_expr_priv(expr
);
176 priv
->key
= ntohl(nla_get_be32(tb
[NFTA_META_KEY
]));
179 case NFT_META_PROTOCOL
:
180 case NFT_META_NFPROTO
:
181 case NFT_META_L4PROTO
:
182 case NFT_META_PRIORITY
:
186 case NFT_META_IIFNAME
:
187 case NFT_META_OIFNAME
:
188 case NFT_META_IIFTYPE
:
189 case NFT_META_OIFTYPE
:
192 #ifdef CONFIG_IP_ROUTE_CLASSID
193 case NFT_META_RTCLASSID
:
195 #ifdef CONFIG_NETWORK_SECMARK
196 case NFT_META_SECMARK
:
203 priv
->dreg
= ntohl(nla_get_be32(tb
[NFTA_META_DREG
]));
204 err
= nft_validate_output_register(priv
->dreg
);
208 err
= nft_validate_data_load(ctx
, priv
->dreg
, NULL
, NFT_DATA_VALUE
);
214 EXPORT_SYMBOL_GPL(nft_meta_get_init
);
216 int nft_meta_set_init(const struct nft_ctx
*ctx
,
217 const struct nft_expr
*expr
,
218 const struct nlattr
* const tb
[])
220 struct nft_meta
*priv
= nft_expr_priv(expr
);
223 priv
->key
= ntohl(nla_get_be32(tb
[NFTA_META_KEY
]));
226 case NFT_META_PRIORITY
:
227 case NFT_META_NFTRACE
:
233 priv
->sreg
= ntohl(nla_get_be32(tb
[NFTA_META_SREG
]));
234 err
= nft_validate_input_register(priv
->sreg
);
240 EXPORT_SYMBOL_GPL(nft_meta_set_init
);
242 int nft_meta_get_dump(struct sk_buff
*skb
,
243 const struct nft_expr
*expr
)
245 const struct nft_meta
*priv
= nft_expr_priv(expr
);
247 if (nla_put_be32(skb
, NFTA_META_KEY
, htonl(priv
->key
)))
248 goto nla_put_failure
;
249 if (nla_put_be32(skb
, NFTA_META_DREG
, htonl(priv
->dreg
)))
250 goto nla_put_failure
;
256 EXPORT_SYMBOL_GPL(nft_meta_get_dump
);
258 int nft_meta_set_dump(struct sk_buff
*skb
,
259 const struct nft_expr
*expr
)
261 const struct nft_meta
*priv
= nft_expr_priv(expr
);
263 if (nla_put_be32(skb
, NFTA_META_KEY
, htonl(priv
->key
)))
264 goto nla_put_failure
;
265 if (nla_put_be32(skb
, NFTA_META_SREG
, htonl(priv
->sreg
)))
266 goto nla_put_failure
;
273 EXPORT_SYMBOL_GPL(nft_meta_set_dump
);
275 static struct nft_expr_type nft_meta_type
;
276 static const struct nft_expr_ops nft_meta_get_ops
= {
277 .type
= &nft_meta_type
,
278 .size
= NFT_EXPR_SIZE(sizeof(struct nft_meta
)),
279 .eval
= nft_meta_get_eval
,
280 .init
= nft_meta_get_init
,
281 .dump
= nft_meta_get_dump
,
284 static const struct nft_expr_ops nft_meta_set_ops
= {
285 .type
= &nft_meta_type
,
286 .size
= NFT_EXPR_SIZE(sizeof(struct nft_meta
)),
287 .eval
= nft_meta_set_eval
,
288 .init
= nft_meta_set_init
,
289 .dump
= nft_meta_set_dump
,
292 static const struct nft_expr_ops
*
293 nft_meta_select_ops(const struct nft_ctx
*ctx
,
294 const struct nlattr
* const tb
[])
296 if (tb
[NFTA_META_KEY
] == NULL
)
297 return ERR_PTR(-EINVAL
);
299 if (tb
[NFTA_META_DREG
] && tb
[NFTA_META_SREG
])
300 return ERR_PTR(-EINVAL
);
302 if (tb
[NFTA_META_DREG
])
303 return &nft_meta_get_ops
;
305 if (tb
[NFTA_META_SREG
])
306 return &nft_meta_set_ops
;
308 return ERR_PTR(-EINVAL
);
311 static struct nft_expr_type nft_meta_type __read_mostly
= {
313 .select_ops
= &nft_meta_select_ops
,
314 .policy
= nft_meta_policy
,
315 .maxattr
= NFTA_META_MAX
,
316 .owner
= THIS_MODULE
,
319 static int __init
nft_meta_module_init(void)
321 return nft_register_expr(&nft_meta_type
);
324 static void __exit
nft_meta_module_exit(void)
326 nft_unregister_expr(&nft_meta_type
);
329 module_init(nft_meta_module_init
);
330 module_exit(nft_meta_module_exit
);
332 MODULE_LICENSE("GPL");
333 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
334 MODULE_ALIAS_NFT_EXPR("meta");