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];
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 = nft_parse_register(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 .destroy = nft_meta_set_destroy,
88 .dump = nft_meta_set_dump,
91 static const struct nft_expr_ops *
92 nft_meta_bridge_select_ops(const struct nft_ctx *ctx,
93 const struct nlattr * const tb[])
95 if (tb[NFTA_META_KEY] == NULL)
96 return ERR_PTR(-EINVAL);
98 if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
99 return ERR_PTR(-EINVAL);
101 if (tb[NFTA_META_DREG])
102 return &nft_meta_bridge_get_ops;
104 if (tb[NFTA_META_SREG])
105 return &nft_meta_bridge_set_ops;
107 return ERR_PTR(-EINVAL);
110 static struct nft_expr_type nft_meta_bridge_type __read_mostly = {
111 .family = NFPROTO_BRIDGE,
113 .select_ops = &nft_meta_bridge_select_ops,
114 .policy = nft_meta_policy,
115 .maxattr = NFTA_META_MAX,
116 .owner = THIS_MODULE,
119 static int __init nft_meta_bridge_module_init(void)
121 return nft_register_expr(&nft_meta_bridge_type);
124 static void __exit nft_meta_bridge_module_exit(void)
126 nft_unregister_expr(&nft_meta_bridge_type);
129 module_init(nft_meta_bridge_module_init);
130 module_exit(nft_meta_bridge_module_exit);
132 MODULE_LICENSE("GPL");
133 MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
134 MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "meta");