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>
21 #include <linux/static_key.h>
24 #include <net/tcp_states.h> /* for TCP_TIME_WAIT */
25 #include <net/netfilter/nf_tables.h>
26 #include <net/netfilter/nf_tables_core.h>
27 #include <net/netfilter/nft_meta.h>
29 #include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
31 static DEFINE_PER_CPU(struct rnd_state
, nft_prandom_state
);
33 void nft_meta_get_eval(const struct nft_expr
*expr
,
34 struct nft_regs
*regs
,
35 const struct nft_pktinfo
*pkt
)
37 const struct nft_meta
*priv
= nft_expr_priv(expr
);
38 const struct sk_buff
*skb
= pkt
->skb
;
39 const struct net_device
*in
= nft_in(pkt
), *out
= nft_out(pkt
);
41 u32
*dest
= ®s
->data
[priv
->dreg
];
47 case NFT_META_PROTOCOL
:
49 *(__be16
*)dest
= skb
->protocol
;
51 case NFT_META_NFPROTO
:
54 case NFT_META_L4PROTO
:
59 case NFT_META_PRIORITY
:
60 *dest
= skb
->priority
;
75 case NFT_META_IIFNAME
:
78 strncpy((char *)dest
, in
->name
, IFNAMSIZ
);
80 case NFT_META_OIFNAME
:
83 strncpy((char *)dest
, out
->name
, IFNAMSIZ
);
85 case NFT_META_IIFTYPE
:
89 *(u16
*)dest
= in
->type
;
91 case NFT_META_OIFTYPE
:
95 *(u16
*)dest
= out
->type
;
98 sk
= skb_to_full_sk(skb
);
99 if (!sk
|| !sk_fullsock(sk
))
102 read_lock_bh(&sk
->sk_callback_lock
);
103 if (sk
->sk_socket
== NULL
||
104 sk
->sk_socket
->file
== NULL
) {
105 read_unlock_bh(&sk
->sk_callback_lock
);
109 *dest
= from_kuid_munged(&init_user_ns
,
110 sk
->sk_socket
->file
->f_cred
->fsuid
);
111 read_unlock_bh(&sk
->sk_callback_lock
);
114 sk
= skb_to_full_sk(skb
);
115 if (!sk
|| !sk_fullsock(sk
))
118 read_lock_bh(&sk
->sk_callback_lock
);
119 if (sk
->sk_socket
== NULL
||
120 sk
->sk_socket
->file
== NULL
) {
121 read_unlock_bh(&sk
->sk_callback_lock
);
124 *dest
= from_kgid_munged(&init_user_ns
,
125 sk
->sk_socket
->file
->f_cred
->fsgid
);
126 read_unlock_bh(&sk
->sk_callback_lock
);
128 #ifdef CONFIG_IP_ROUTE_CLASSID
129 case NFT_META_RTCLASSID
: {
130 const struct dst_entry
*dst
= skb_dst(skb
);
134 *dest
= dst
->tclassid
;
138 #ifdef CONFIG_NETWORK_SECMARK
139 case NFT_META_SECMARK
:
140 *dest
= skb
->secmark
;
143 case NFT_META_PKTTYPE
:
144 if (skb
->pkt_type
!= PACKET_LOOPBACK
) {
145 *dest
= skb
->pkt_type
;
149 switch (nft_pf(pkt
)) {
151 if (ipv4_is_multicast(ip_hdr(skb
)->daddr
))
152 *dest
= PACKET_MULTICAST
;
154 *dest
= PACKET_BROADCAST
;
157 if (ipv6_hdr(skb
)->daddr
.s6_addr
[0] == 0xFF)
158 *dest
= PACKET_MULTICAST
;
160 *dest
= PACKET_BROADCAST
;
168 *dest
= raw_smp_processor_id();
170 case NFT_META_IIFGROUP
:
175 case NFT_META_OIFGROUP
:
180 #ifdef CONFIG_CGROUP_NET_CLASSID
181 case NFT_META_CGROUP
:
182 sk
= skb_to_full_sk(skb
);
183 if (!sk
|| !sk_fullsock(sk
))
185 *dest
= sock_cgroup_classid(&sk
->sk_cgrp_data
);
188 case NFT_META_PRANDOM
: {
189 struct rnd_state
*state
= this_cpu_ptr(&nft_prandom_state
);
190 *dest
= prandom_u32_state(state
);
200 regs
->verdict
.code
= NFT_BREAK
;
202 EXPORT_SYMBOL_GPL(nft_meta_get_eval
);
204 void nft_meta_set_eval(const struct nft_expr
*expr
,
205 struct nft_regs
*regs
,
206 const struct nft_pktinfo
*pkt
)
208 const struct nft_meta
*meta
= nft_expr_priv(expr
);
209 struct sk_buff
*skb
= pkt
->skb
;
210 u32 value
= regs
->data
[meta
->sreg
];
216 case NFT_META_PRIORITY
:
217 skb
->priority
= value
;
219 case NFT_META_PKTTYPE
:
220 if (skb
->pkt_type
!= value
&&
221 skb_pkt_type_ok(value
) && skb_pkt_type_ok(skb
->pkt_type
))
222 skb
->pkt_type
= value
;
224 case NFT_META_NFTRACE
:
225 skb
->nf_trace
= !!value
;
231 EXPORT_SYMBOL_GPL(nft_meta_set_eval
);
233 const struct nla_policy nft_meta_policy
[NFTA_META_MAX
+ 1] = {
234 [NFTA_META_DREG
] = { .type
= NLA_U32
},
235 [NFTA_META_KEY
] = { .type
= NLA_U32
},
236 [NFTA_META_SREG
] = { .type
= NLA_U32
},
238 EXPORT_SYMBOL_GPL(nft_meta_policy
);
240 int nft_meta_get_init(const struct nft_ctx
*ctx
,
241 const struct nft_expr
*expr
,
242 const struct nlattr
* const tb
[])
244 struct nft_meta
*priv
= nft_expr_priv(expr
);
247 priv
->key
= ntohl(nla_get_be32(tb
[NFTA_META_KEY
]));
249 case NFT_META_PROTOCOL
:
250 case NFT_META_IIFTYPE
:
251 case NFT_META_OIFTYPE
:
254 case NFT_META_NFPROTO
:
255 case NFT_META_L4PROTO
:
257 case NFT_META_PRIORITY
:
263 #ifdef CONFIG_IP_ROUTE_CLASSID
264 case NFT_META_RTCLASSID
:
266 #ifdef CONFIG_NETWORK_SECMARK
267 case NFT_META_SECMARK
:
269 case NFT_META_PKTTYPE
:
271 case NFT_META_IIFGROUP
:
272 case NFT_META_OIFGROUP
:
273 #ifdef CONFIG_CGROUP_NET_CLASSID
274 case NFT_META_CGROUP
:
278 case NFT_META_IIFNAME
:
279 case NFT_META_OIFNAME
:
282 case NFT_META_PRANDOM
:
283 prandom_init_once(&nft_prandom_state
);
290 priv
->dreg
= nft_parse_register(tb
[NFTA_META_DREG
]);
291 return nft_validate_register_store(ctx
, priv
->dreg
, NULL
,
292 NFT_DATA_VALUE
, len
);
294 EXPORT_SYMBOL_GPL(nft_meta_get_init
);
296 int nft_meta_set_validate(const struct nft_ctx
*ctx
,
297 const struct nft_expr
*expr
,
298 const struct nft_data
**data
)
300 struct nft_meta
*priv
= nft_expr_priv(expr
);
303 if (priv
->key
!= NFT_META_PKTTYPE
)
306 switch (ctx
->afi
->family
) {
308 hooks
= 1 << NF_BR_PRE_ROUTING
;
311 hooks
= 1 << NF_NETDEV_INGRESS
;
316 hooks
= 1 << NF_INET_PRE_ROUTING
;
322 return nft_chain_validate_hooks(ctx
->chain
, hooks
);
324 EXPORT_SYMBOL_GPL(nft_meta_set_validate
);
326 int nft_meta_set_init(const struct nft_ctx
*ctx
,
327 const struct nft_expr
*expr
,
328 const struct nlattr
* const tb
[])
330 struct nft_meta
*priv
= nft_expr_priv(expr
);
334 priv
->key
= ntohl(nla_get_be32(tb
[NFTA_META_KEY
]));
337 case NFT_META_PRIORITY
:
340 case NFT_META_NFTRACE
:
343 case NFT_META_PKTTYPE
:
350 err
= nft_meta_set_validate(ctx
, expr
, NULL
);
354 priv
->sreg
= nft_parse_register(tb
[NFTA_META_SREG
]);
355 err
= nft_validate_register_load(priv
->sreg
, len
);
359 if (priv
->key
== NFT_META_NFTRACE
)
360 static_branch_inc(&nft_trace_enabled
);
364 EXPORT_SYMBOL_GPL(nft_meta_set_init
);
366 int nft_meta_get_dump(struct sk_buff
*skb
,
367 const struct nft_expr
*expr
)
369 const struct nft_meta
*priv
= nft_expr_priv(expr
);
371 if (nla_put_be32(skb
, NFTA_META_KEY
, htonl(priv
->key
)))
372 goto nla_put_failure
;
373 if (nft_dump_register(skb
, NFTA_META_DREG
, priv
->dreg
))
374 goto nla_put_failure
;
380 EXPORT_SYMBOL_GPL(nft_meta_get_dump
);
382 int nft_meta_set_dump(struct sk_buff
*skb
,
383 const struct nft_expr
*expr
)
385 const struct nft_meta
*priv
= nft_expr_priv(expr
);
387 if (nla_put_be32(skb
, NFTA_META_KEY
, htonl(priv
->key
)))
388 goto nla_put_failure
;
389 if (nft_dump_register(skb
, NFTA_META_SREG
, priv
->sreg
))
390 goto nla_put_failure
;
397 EXPORT_SYMBOL_GPL(nft_meta_set_dump
);
399 void nft_meta_set_destroy(const struct nft_ctx
*ctx
,
400 const struct nft_expr
*expr
)
402 const struct nft_meta
*priv
= nft_expr_priv(expr
);
404 if (priv
->key
== NFT_META_NFTRACE
)
405 static_branch_dec(&nft_trace_enabled
);
407 EXPORT_SYMBOL_GPL(nft_meta_set_destroy
);
409 static struct nft_expr_type nft_meta_type
;
410 static const struct nft_expr_ops nft_meta_get_ops
= {
411 .type
= &nft_meta_type
,
412 .size
= NFT_EXPR_SIZE(sizeof(struct nft_meta
)),
413 .eval
= nft_meta_get_eval
,
414 .init
= nft_meta_get_init
,
415 .dump
= nft_meta_get_dump
,
418 static const struct nft_expr_ops nft_meta_set_ops
= {
419 .type
= &nft_meta_type
,
420 .size
= NFT_EXPR_SIZE(sizeof(struct nft_meta
)),
421 .eval
= nft_meta_set_eval
,
422 .init
= nft_meta_set_init
,
423 .destroy
= nft_meta_set_destroy
,
424 .dump
= nft_meta_set_dump
,
425 .validate
= nft_meta_set_validate
,
428 static const struct nft_expr_ops
*
429 nft_meta_select_ops(const struct nft_ctx
*ctx
,
430 const struct nlattr
* const tb
[])
432 if (tb
[NFTA_META_KEY
] == NULL
)
433 return ERR_PTR(-EINVAL
);
435 if (tb
[NFTA_META_DREG
] && tb
[NFTA_META_SREG
])
436 return ERR_PTR(-EINVAL
);
438 if (tb
[NFTA_META_DREG
])
439 return &nft_meta_get_ops
;
441 if (tb
[NFTA_META_SREG
])
442 return &nft_meta_set_ops
;
444 return ERR_PTR(-EINVAL
);
447 static struct nft_expr_type nft_meta_type __read_mostly
= {
449 .select_ops
= &nft_meta_select_ops
,
450 .policy
= nft_meta_policy
,
451 .maxattr
= NFTA_META_MAX
,
452 .owner
= THIS_MODULE
,
455 static int __init
nft_meta_module_init(void)
457 return nft_register_expr(&nft_meta_type
);
460 static void __exit
nft_meta_module_exit(void)
462 nft_unregister_expr(&nft_meta_type
);
465 module_init(nft_meta_module_init
);
466 module_exit(nft_meta_module_exit
);
468 MODULE_LICENSE("GPL");
469 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
470 MODULE_ALIAS_NFT_EXPR("meta");