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
|| !sk_fullsock(skb
->sk
))
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
|| !sk_fullsock(skb
->sk
))
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] = raw_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
:
169 if (skb
->sk
== NULL
|| !sk_fullsock(skb
->sk
))
171 dest
->data
[0] = skb
->sk
->sk_classid
;
180 data
[NFT_REG_VERDICT
].verdict
= NFT_BREAK
;
182 EXPORT_SYMBOL_GPL(nft_meta_get_eval
);
184 void nft_meta_set_eval(const struct nft_expr
*expr
,
185 struct nft_data data
[NFT_REG_MAX
+ 1],
186 const struct nft_pktinfo
*pkt
)
188 const struct nft_meta
*meta
= nft_expr_priv(expr
);
189 struct sk_buff
*skb
= pkt
->skb
;
190 u32 value
= data
[meta
->sreg
].data
[0];
196 case NFT_META_PRIORITY
:
197 skb
->priority
= value
;
199 case NFT_META_NFTRACE
:
206 EXPORT_SYMBOL_GPL(nft_meta_set_eval
);
208 const struct nla_policy nft_meta_policy
[NFTA_META_MAX
+ 1] = {
209 [NFTA_META_DREG
] = { .type
= NLA_U32
},
210 [NFTA_META_KEY
] = { .type
= NLA_U32
},
211 [NFTA_META_SREG
] = { .type
= NLA_U32
},
213 EXPORT_SYMBOL_GPL(nft_meta_policy
);
215 int nft_meta_get_init(const struct nft_ctx
*ctx
,
216 const struct nft_expr
*expr
,
217 const struct nlattr
* const tb
[])
219 struct nft_meta
*priv
= nft_expr_priv(expr
);
222 priv
->key
= ntohl(nla_get_be32(tb
[NFTA_META_KEY
]));
225 case NFT_META_PROTOCOL
:
226 case NFT_META_NFPROTO
:
227 case NFT_META_L4PROTO
:
228 case NFT_META_PRIORITY
:
232 case NFT_META_IIFNAME
:
233 case NFT_META_OIFNAME
:
234 case NFT_META_IIFTYPE
:
235 case NFT_META_OIFTYPE
:
238 #ifdef CONFIG_IP_ROUTE_CLASSID
239 case NFT_META_RTCLASSID
:
241 #ifdef CONFIG_NETWORK_SECMARK
242 case NFT_META_SECMARK
:
244 case NFT_META_PKTTYPE
:
246 case NFT_META_IIFGROUP
:
247 case NFT_META_OIFGROUP
:
248 case NFT_META_CGROUP
:
254 priv
->dreg
= ntohl(nla_get_be32(tb
[NFTA_META_DREG
]));
255 err
= nft_validate_output_register(priv
->dreg
);
259 err
= nft_validate_data_load(ctx
, priv
->dreg
, NULL
, NFT_DATA_VALUE
);
265 EXPORT_SYMBOL_GPL(nft_meta_get_init
);
267 int nft_meta_set_init(const struct nft_ctx
*ctx
,
268 const struct nft_expr
*expr
,
269 const struct nlattr
* const tb
[])
271 struct nft_meta
*priv
= nft_expr_priv(expr
);
274 priv
->key
= ntohl(nla_get_be32(tb
[NFTA_META_KEY
]));
277 case NFT_META_PRIORITY
:
278 case NFT_META_NFTRACE
:
284 priv
->sreg
= ntohl(nla_get_be32(tb
[NFTA_META_SREG
]));
285 err
= nft_validate_input_register(priv
->sreg
);
291 EXPORT_SYMBOL_GPL(nft_meta_set_init
);
293 int nft_meta_get_dump(struct sk_buff
*skb
,
294 const struct nft_expr
*expr
)
296 const struct nft_meta
*priv
= nft_expr_priv(expr
);
298 if (nla_put_be32(skb
, NFTA_META_KEY
, htonl(priv
->key
)))
299 goto nla_put_failure
;
300 if (nla_put_be32(skb
, NFTA_META_DREG
, htonl(priv
->dreg
)))
301 goto nla_put_failure
;
307 EXPORT_SYMBOL_GPL(nft_meta_get_dump
);
309 int nft_meta_set_dump(struct sk_buff
*skb
,
310 const struct nft_expr
*expr
)
312 const struct nft_meta
*priv
= nft_expr_priv(expr
);
314 if (nla_put_be32(skb
, NFTA_META_KEY
, htonl(priv
->key
)))
315 goto nla_put_failure
;
316 if (nla_put_be32(skb
, NFTA_META_SREG
, htonl(priv
->sreg
)))
317 goto nla_put_failure
;
324 EXPORT_SYMBOL_GPL(nft_meta_set_dump
);
326 static struct nft_expr_type nft_meta_type
;
327 static const struct nft_expr_ops nft_meta_get_ops
= {
328 .type
= &nft_meta_type
,
329 .size
= NFT_EXPR_SIZE(sizeof(struct nft_meta
)),
330 .eval
= nft_meta_get_eval
,
331 .init
= nft_meta_get_init
,
332 .dump
= nft_meta_get_dump
,
335 static const struct nft_expr_ops nft_meta_set_ops
= {
336 .type
= &nft_meta_type
,
337 .size
= NFT_EXPR_SIZE(sizeof(struct nft_meta
)),
338 .eval
= nft_meta_set_eval
,
339 .init
= nft_meta_set_init
,
340 .dump
= nft_meta_set_dump
,
343 static const struct nft_expr_ops
*
344 nft_meta_select_ops(const struct nft_ctx
*ctx
,
345 const struct nlattr
* const tb
[])
347 if (tb
[NFTA_META_KEY
] == NULL
)
348 return ERR_PTR(-EINVAL
);
350 if (tb
[NFTA_META_DREG
] && tb
[NFTA_META_SREG
])
351 return ERR_PTR(-EINVAL
);
353 if (tb
[NFTA_META_DREG
])
354 return &nft_meta_get_ops
;
356 if (tb
[NFTA_META_SREG
])
357 return &nft_meta_set_ops
;
359 return ERR_PTR(-EINVAL
);
362 static struct nft_expr_type nft_meta_type __read_mostly
= {
364 .select_ops
= &nft_meta_select_ops
,
365 .policy
= nft_meta_policy
,
366 .maxattr
= NFTA_META_MAX
,
367 .owner
= THIS_MODULE
,
370 static int __init
nft_meta_module_init(void)
372 return nft_register_expr(&nft_meta_type
);
375 static void __exit
nft_meta_module_exit(void)
377 nft_unregister_expr(&nft_meta_type
);
380 module_init(nft_meta_module_init
);
381 module_exit(nft_meta_module_exit
);
383 MODULE_LICENSE("GPL");
384 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
385 MODULE_ALIAS_NFT_EXPR("meta");