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f5efc696 TB |
1 | /* |
2 | * Copyright (c) 2014 Intel Corporation | |
3 | * | |
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. | |
7 | * | |
8 | */ | |
9 | ||
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> | |
18 | ||
19 | #include "../br_private.h" | |
20 | ||
21 | static void nft_meta_bridge_get_eval(const struct nft_expr *expr, | |
a55e22e9 | 22 | struct nft_regs *regs, |
f5efc696 TB |
23 | const struct nft_pktinfo *pkt) |
24 | { | |
25 | const struct nft_meta *priv = nft_expr_priv(expr); | |
26 | const struct net_device *in = pkt->in, *out = pkt->out; | |
49499c3e | 27 | u32 *dest = ®s->data[priv->dreg]; |
f5efc696 TB |
28 | const struct net_bridge_port *p; |
29 | ||
30 | switch (priv->key) { | |
31 | case NFT_META_BRI_IIFNAME: | |
32 | if (in == NULL || (p = br_port_get_rcu(in)) == NULL) | |
33 | goto err; | |
34 | break; | |
35 | case NFT_META_BRI_OIFNAME: | |
36 | if (out == NULL || (p = br_port_get_rcu(out)) == NULL) | |
37 | goto err; | |
38 | break; | |
39 | default: | |
40 | goto out; | |
41 | } | |
42 | ||
fad136ea | 43 | strncpy((char *)dest, p->br->dev->name, IFNAMSIZ); |
f5efc696 TB |
44 | return; |
45 | out: | |
a55e22e9 | 46 | return nft_meta_get_eval(expr, regs, pkt); |
f5efc696 | 47 | err: |
a55e22e9 | 48 | regs->verdict.code = NFT_BREAK; |
f5efc696 TB |
49 | } |
50 | ||
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[]) | |
54 | { | |
55 | struct nft_meta *priv = nft_expr_priv(expr); | |
45d9bcda | 56 | unsigned int len; |
f5efc696 TB |
57 | |
58 | priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); | |
59 | switch (priv->key) { | |
60 | case NFT_META_BRI_IIFNAME: | |
61 | case NFT_META_BRI_OIFNAME: | |
45d9bcda | 62 | len = IFNAMSIZ; |
f5efc696 TB |
63 | break; |
64 | default: | |
65 | return nft_meta_get_init(ctx, expr, tb); | |
66 | } | |
67 | ||
b1c96ed3 | 68 | priv->dreg = nft_parse_register(tb[NFTA_META_DREG]); |
27e6d201 PM |
69 | return nft_validate_register_store(ctx, priv->dreg, NULL, |
70 | NFT_DATA_VALUE, len); | |
f5efc696 TB |
71 | } |
72 | ||
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, | |
80 | }; | |
81 | ||
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, | |
e639f7ab | 87 | .destroy = nft_meta_set_destroy, |
f5efc696 | 88 | .dump = nft_meta_set_dump, |
960fa72f | 89 | .validate = nft_meta_set_validate, |
f5efc696 TB |
90 | }; |
91 | ||
92 | static const struct nft_expr_ops * | |
93 | nft_meta_bridge_select_ops(const struct nft_ctx *ctx, | |
94 | const struct nlattr * const tb[]) | |
95 | { | |
96 | if (tb[NFTA_META_KEY] == NULL) | |
97 | return ERR_PTR(-EINVAL); | |
98 | ||
99 | if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG]) | |
100 | return ERR_PTR(-EINVAL); | |
101 | ||
102 | if (tb[NFTA_META_DREG]) | |
103 | return &nft_meta_bridge_get_ops; | |
104 | ||
105 | if (tb[NFTA_META_SREG]) | |
106 | return &nft_meta_bridge_set_ops; | |
107 | ||
108 | return ERR_PTR(-EINVAL); | |
109 | } | |
110 | ||
111 | static struct nft_expr_type nft_meta_bridge_type __read_mostly = { | |
112 | .family = NFPROTO_BRIDGE, | |
113 | .name = "meta", | |
114 | .select_ops = &nft_meta_bridge_select_ops, | |
115 | .policy = nft_meta_policy, | |
116 | .maxattr = NFTA_META_MAX, | |
117 | .owner = THIS_MODULE, | |
118 | }; | |
119 | ||
120 | static int __init nft_meta_bridge_module_init(void) | |
121 | { | |
122 | return nft_register_expr(&nft_meta_bridge_type); | |
123 | } | |
124 | ||
125 | static void __exit nft_meta_bridge_module_exit(void) | |
126 | { | |
127 | nft_unregister_expr(&nft_meta_bridge_type); | |
128 | } | |
129 | ||
130 | module_init(nft_meta_bridge_module_init); | |
131 | module_exit(nft_meta_bridge_module_exit); | |
132 | ||
133 | MODULE_LICENSE("GPL"); | |
134 | MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>"); | |
135 | MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "meta"); |