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 <linux/ipv6.h>
20 #include <linux/smp.h>
23 #include <net/tcp_states.h> /* for TCP_TIME_WAIT */
24 #include <net/netfilter/nf_tables.h>
25 #include <net/netfilter/nft_meta.h>
27 void nft_meta_get_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_meta
*priv
= nft_expr_priv(expr
);
32 const struct sk_buff
*skb
= pkt
->skb
;
33 const struct net_device
*in
= pkt
->in
, *out
= pkt
->out
;
34 struct nft_data
*dest
= &data
[priv
->dreg
];
38 dest
->data
[0] = skb
->len
;
40 case NFT_META_PROTOCOL
:
41 *(__be16
*)dest
->data
= skb
->protocol
;
43 case NFT_META_NFPROTO
:
44 dest
->data
[0] = pkt
->ops
->pf
;
46 case NFT_META_L4PROTO
:
47 dest
->data
[0] = pkt
->tprot
;
49 case NFT_META_PRIORITY
:
50 dest
->data
[0] = skb
->priority
;
53 dest
->data
[0] = skb
->mark
;
58 dest
->data
[0] = in
->ifindex
;
63 dest
->data
[0] = out
->ifindex
;
65 case NFT_META_IIFNAME
:
68 strncpy((char *)dest
->data
, in
->name
, sizeof(dest
->data
));
70 case NFT_META_OIFNAME
:
73 strncpy((char *)dest
->data
, out
->name
, sizeof(dest
->data
));
75 case NFT_META_IIFTYPE
:
78 *(u16
*)dest
->data
= in
->type
;
80 case NFT_META_OIFTYPE
:
83 *(u16
*)dest
->data
= out
->type
;
86 if (skb
->sk
== NULL
|| skb
->sk
->sk_state
== TCP_TIME_WAIT
)
89 read_lock_bh(&skb
->sk
->sk_callback_lock
);
90 if (skb
->sk
->sk_socket
== NULL
||
91 skb
->sk
->sk_socket
->file
== NULL
) {
92 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
97 from_kuid_munged(&init_user_ns
,
98 skb
->sk
->sk_socket
->file
->f_cred
->fsuid
);
99 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
102 if (skb
->sk
== NULL
|| skb
->sk
->sk_state
== TCP_TIME_WAIT
)
105 read_lock_bh(&skb
->sk
->sk_callback_lock
);
106 if (skb
->sk
->sk_socket
== NULL
||
107 skb
->sk
->sk_socket
->file
== NULL
) {
108 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
112 from_kgid_munged(&init_user_ns
,
113 skb
->sk
->sk_socket
->file
->f_cred
->fsgid
);
114 read_unlock_bh(&skb
->sk
->sk_callback_lock
);
116 #ifdef CONFIG_IP_ROUTE_CLASSID
117 case NFT_META_RTCLASSID
: {
118 const struct dst_entry
*dst
= skb_dst(skb
);
122 dest
->data
[0] = dst
->tclassid
;
126 #ifdef CONFIG_NETWORK_SECMARK
127 case NFT_META_SECMARK
:
128 dest
->data
[0] = skb
->secmark
;
131 case NFT_META_PKTTYPE
:
132 if (skb
->pkt_type
!= PACKET_LOOPBACK
) {
133 dest
->data
[0] = skb
->pkt_type
;
137 switch (pkt
->ops
->pf
) {
139 if (ipv4_is_multicast(ip_hdr(skb
)->daddr
))
140 dest
->data
[0] = PACKET_MULTICAST
;
142 dest
->data
[0] = PACKET_BROADCAST
;
145 if (ipv6_hdr(skb
)->daddr
.s6_addr
[0] == 0xFF)
146 dest
->data
[0] = PACKET_MULTICAST
;
148 dest
->data
[0] = PACKET_BROADCAST
;
156 dest
->data
[0] = smp_processor_id();
158 case NFT_META_IIFGROUP
:
161 dest
->data
[0] = in
->group
;
163 case NFT_META_OIFGROUP
:
166 dest
->data
[0] = out
->group
;
168 case NFT_META_CGROUP
:
172 dest
->data
[0] = skb
->sk
->sk_classid
;
181 data
[NFT_REG_VERDICT
].verdict
= NFT_BREAK
;
183 EXPORT_SYMBOL_GPL(nft_meta_get_eval
);
185 void nft_meta_set_eval(const struct nft_expr
*expr
,
186 struct nft_data data
[NFT_REG_MAX
+ 1],
187 const struct nft_pktinfo
*pkt
)
189 const struct nft_meta
*meta
= nft_expr_priv(expr
);
190 struct sk_buff
*skb
= pkt
->skb
;
191 u32 value
= data
[meta
->sreg
].data
[0];
197 case NFT_META_PRIORITY
:
198 skb
->priority
= value
;
200 case NFT_META_NFTRACE
:
207 EXPORT_SYMBOL_GPL(nft_meta_set_eval
);
209 const struct nla_policy nft_meta_policy
[NFTA_META_MAX
+ 1] = {
210 [NFTA_META_DREG
] = { .type
= NLA_U32
},
211 [NFTA_META_KEY
] = { .type
= NLA_U32
},
212 [NFTA_META_SREG
] = { .type
= NLA_U32
},
214 EXPORT_SYMBOL_GPL(nft_meta_policy
);
216 int nft_meta_get_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_PROTOCOL
:
227 case NFT_META_NFPROTO
:
228 case NFT_META_L4PROTO
:
229 case NFT_META_PRIORITY
:
233 case NFT_META_IIFNAME
:
234 case NFT_META_OIFNAME
:
235 case NFT_META_IIFTYPE
:
236 case NFT_META_OIFTYPE
:
239 #ifdef CONFIG_IP_ROUTE_CLASSID
240 case NFT_META_RTCLASSID
:
242 #ifdef CONFIG_NETWORK_SECMARK
243 case NFT_META_SECMARK
:
245 case NFT_META_PKTTYPE
:
247 case NFT_META_IIFGROUP
:
248 case NFT_META_OIFGROUP
:
249 case NFT_META_CGROUP
:
255 priv
->dreg
= ntohl(nla_get_be32(tb
[NFTA_META_DREG
]));
256 err
= nft_validate_output_register(priv
->dreg
);
260 err
= nft_validate_data_load(ctx
, priv
->dreg
, NULL
, NFT_DATA_VALUE
);
266 EXPORT_SYMBOL_GPL(nft_meta_get_init
);
268 int nft_meta_set_init(const struct nft_ctx
*ctx
,
269 const struct nft_expr
*expr
,
270 const struct nlattr
* const tb
[])
272 struct nft_meta
*priv
= nft_expr_priv(expr
);
275 priv
->key
= ntohl(nla_get_be32(tb
[NFTA_META_KEY
]));
278 case NFT_META_PRIORITY
:
279 case NFT_META_NFTRACE
:
285 priv
->sreg
= ntohl(nla_get_be32(tb
[NFTA_META_SREG
]));
286 err
= nft_validate_input_register(priv
->sreg
);
292 EXPORT_SYMBOL_GPL(nft_meta_set_init
);
294 int nft_meta_get_dump(struct sk_buff
*skb
,
295 const struct nft_expr
*expr
)
297 const struct nft_meta
*priv
= nft_expr_priv(expr
);
299 if (nla_put_be32(skb
, NFTA_META_KEY
, htonl(priv
->key
)))
300 goto nla_put_failure
;
301 if (nla_put_be32(skb
, NFTA_META_DREG
, htonl(priv
->dreg
)))
302 goto nla_put_failure
;
308 EXPORT_SYMBOL_GPL(nft_meta_get_dump
);
310 int nft_meta_set_dump(struct sk_buff
*skb
,
311 const struct nft_expr
*expr
)
313 const struct nft_meta
*priv
= nft_expr_priv(expr
);
315 if (nla_put_be32(skb
, NFTA_META_KEY
, htonl(priv
->key
)))
316 goto nla_put_failure
;
317 if (nla_put_be32(skb
, NFTA_META_SREG
, htonl(priv
->sreg
)))
318 goto nla_put_failure
;
325 EXPORT_SYMBOL_GPL(nft_meta_set_dump
);
327 static struct nft_expr_type nft_meta_type
;
328 static const struct nft_expr_ops nft_meta_get_ops
= {
329 .type
= &nft_meta_type
,
330 .size
= NFT_EXPR_SIZE(sizeof(struct nft_meta
)),
331 .eval
= nft_meta_get_eval
,
332 .init
= nft_meta_get_init
,
333 .dump
= nft_meta_get_dump
,
336 static const struct nft_expr_ops nft_meta_set_ops
= {
337 .type
= &nft_meta_type
,
338 .size
= NFT_EXPR_SIZE(sizeof(struct nft_meta
)),
339 .eval
= nft_meta_set_eval
,
340 .init
= nft_meta_set_init
,
341 .dump
= nft_meta_set_dump
,
344 static const struct nft_expr_ops
*
345 nft_meta_select_ops(const struct nft_ctx
*ctx
,
346 const struct nlattr
* const tb
[])
348 if (tb
[NFTA_META_KEY
] == NULL
)
349 return ERR_PTR(-EINVAL
);
351 if (tb
[NFTA_META_DREG
] && tb
[NFTA_META_SREG
])
352 return ERR_PTR(-EINVAL
);
354 if (tb
[NFTA_META_DREG
])
355 return &nft_meta_get_ops
;
357 if (tb
[NFTA_META_SREG
])
358 return &nft_meta_set_ops
;
360 return ERR_PTR(-EINVAL
);
363 static struct nft_expr_type nft_meta_type __read_mostly
= {
365 .select_ops
= &nft_meta_select_ops
,
366 .policy
= nft_meta_policy
,
367 .maxattr
= NFTA_META_MAX
,
368 .owner
= THIS_MODULE
,
371 static int __init
nft_meta_module_init(void)
373 return nft_register_expr(&nft_meta_type
);
376 static void __exit
nft_meta_module_exit(void)
378 nft_unregister_expr(&nft_meta_type
);
381 module_init(nft_meta_module_init
);
382 module_exit(nft_meta_module_exit
);
384 MODULE_LICENSE("GPL");
385 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
386 MODULE_ALIAS_NFT_EXPR("meta");