2 * Copyright (c) 2014 Intel Corporation
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.
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/module.h>
13 #include <linux/netlink.h>
14 #include <linux/netfilter.h>
15 #include <linux/netfilter/nf_tables.h>
16 #include <net/netfilter/nf_tables.h>
17 #include <net/netfilter/nft_meta.h>
19 #include "../br_private.h"
21 static void nft_meta_bridge_get_eval(const struct nft_expr
*expr
,
22 struct nft_regs
*regs
,
23 const struct nft_pktinfo
*pkt
)
25 const struct nft_meta
*priv
= nft_expr_priv(expr
);
26 const struct net_device
*in
= pkt
->in
, *out
= pkt
->out
;
27 u32
*dest
= ®s
->data
[priv
->dreg
].data
[0];
28 const struct net_bridge_port
*p
;
31 case NFT_META_BRI_IIFNAME
:
32 if (in
== NULL
|| (p
= br_port_get_rcu(in
)) == NULL
)
35 case NFT_META_BRI_OIFNAME
:
36 if (out
== NULL
|| (p
= br_port_get_rcu(out
)) == NULL
)
43 strncpy((char *)dest
, p
->br
->dev
->name
, IFNAMSIZ
);
46 return nft_meta_get_eval(expr
, regs
, pkt
);
48 regs
->verdict
.code
= NFT_BREAK
;
51 static int nft_meta_bridge_get_init(const struct nft_ctx
*ctx
,
52 const struct nft_expr
*expr
,
53 const struct nlattr
* const tb
[])
55 struct nft_meta
*priv
= nft_expr_priv(expr
);
58 priv
->key
= ntohl(nla_get_be32(tb
[NFTA_META_KEY
]));
60 case NFT_META_BRI_IIFNAME
:
61 case NFT_META_BRI_OIFNAME
:
65 return nft_meta_get_init(ctx
, expr
, tb
);
68 priv
->dreg
= ntohl(nla_get_be32(tb
[NFTA_META_DREG
]));
69 return nft_validate_register_store(ctx
, priv
->dreg
, NULL
,
73 static struct nft_expr_type nft_meta_bridge_type
;
74 static const struct nft_expr_ops nft_meta_bridge_get_ops
= {
75 .type
= &nft_meta_bridge_type
,
76 .size
= NFT_EXPR_SIZE(sizeof(struct nft_meta
)),
77 .eval
= nft_meta_bridge_get_eval
,
78 .init
= nft_meta_bridge_get_init
,
79 .dump
= nft_meta_get_dump
,
82 static const struct nft_expr_ops nft_meta_bridge_set_ops
= {
83 .type
= &nft_meta_bridge_type
,
84 .size
= NFT_EXPR_SIZE(sizeof(struct nft_meta
)),
85 .eval
= nft_meta_set_eval
,
86 .init
= nft_meta_set_init
,
87 .dump
= nft_meta_set_dump
,
90 static const struct nft_expr_ops
*
91 nft_meta_bridge_select_ops(const struct nft_ctx
*ctx
,
92 const struct nlattr
* const tb
[])
94 if (tb
[NFTA_META_KEY
] == NULL
)
95 return ERR_PTR(-EINVAL
);
97 if (tb
[NFTA_META_DREG
] && tb
[NFTA_META_SREG
])
98 return ERR_PTR(-EINVAL
);
100 if (tb
[NFTA_META_DREG
])
101 return &nft_meta_bridge_get_ops
;
103 if (tb
[NFTA_META_SREG
])
104 return &nft_meta_bridge_set_ops
;
106 return ERR_PTR(-EINVAL
);
109 static struct nft_expr_type nft_meta_bridge_type __read_mostly
= {
110 .family
= NFPROTO_BRIDGE
,
112 .select_ops
= &nft_meta_bridge_select_ops
,
113 .policy
= nft_meta_policy
,
114 .maxattr
= NFTA_META_MAX
,
115 .owner
= THIS_MODULE
,
118 static int __init
nft_meta_bridge_module_init(void)
120 return nft_register_expr(&nft_meta_bridge_type
);
123 static void __exit
nft_meta_bridge_module_exit(void)
125 nft_unregister_expr(&nft_meta_bridge_type
);
128 module_init(nft_meta_bridge_module_init
);
129 module_exit(nft_meta_bridge_module_exit
);
131 MODULE_LICENSE("GPL");
132 MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
133 MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE
, "meta");