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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, | |
22 | struct nft_data data[NFT_REG_MAX + 1], | |
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; | |
27 | struct nft_data *dest = &data[priv->dreg]; | |
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 | ||
43 | strncpy((char *)dest->data, p->br->dev->name, sizeof(dest->data)); | |
44 | return; | |
45 | out: | |
46 | return nft_meta_get_eval(expr, data, pkt); | |
47 | err: | |
48 | data[NFT_REG_VERDICT].verdict = NFT_BREAK; | |
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); | |
56 | int err; | |
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: | |
62 | break; | |
63 | default: | |
64 | return nft_meta_get_init(ctx, expr, tb); | |
65 | } | |
66 | ||
67 | priv->dreg = ntohl(nla_get_be32(tb[NFTA_META_DREG])); | |
68 | err = nft_validate_output_register(priv->dreg); | |
69 | if (err < 0) | |
70 | return err; | |
71 | ||
72 | err = nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE); | |
73 | if (err < 0) | |
74 | return err; | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | static struct nft_expr_type nft_meta_bridge_type; | |
80 | static const struct nft_expr_ops nft_meta_bridge_get_ops = { | |
81 | .type = &nft_meta_bridge_type, | |
82 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), | |
83 | .eval = nft_meta_bridge_get_eval, | |
84 | .init = nft_meta_bridge_get_init, | |
85 | .dump = nft_meta_get_dump, | |
86 | }; | |
87 | ||
88 | static const struct nft_expr_ops nft_meta_bridge_set_ops = { | |
89 | .type = &nft_meta_bridge_type, | |
90 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), | |
91 | .eval = nft_meta_set_eval, | |
92 | .init = nft_meta_set_init, | |
93 | .dump = nft_meta_set_dump, | |
94 | }; | |
95 | ||
96 | static const struct nft_expr_ops * | |
97 | nft_meta_bridge_select_ops(const struct nft_ctx *ctx, | |
98 | const struct nlattr * const tb[]) | |
99 | { | |
100 | if (tb[NFTA_META_KEY] == NULL) | |
101 | return ERR_PTR(-EINVAL); | |
102 | ||
103 | if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG]) | |
104 | return ERR_PTR(-EINVAL); | |
105 | ||
106 | if (tb[NFTA_META_DREG]) | |
107 | return &nft_meta_bridge_get_ops; | |
108 | ||
109 | if (tb[NFTA_META_SREG]) | |
110 | return &nft_meta_bridge_set_ops; | |
111 | ||
112 | return ERR_PTR(-EINVAL); | |
113 | } | |
114 | ||
115 | static struct nft_expr_type nft_meta_bridge_type __read_mostly = { | |
116 | .family = NFPROTO_BRIDGE, | |
117 | .name = "meta", | |
118 | .select_ops = &nft_meta_bridge_select_ops, | |
119 | .policy = nft_meta_policy, | |
120 | .maxattr = NFTA_META_MAX, | |
121 | .owner = THIS_MODULE, | |
122 | }; | |
123 | ||
124 | static int __init nft_meta_bridge_module_init(void) | |
125 | { | |
126 | return nft_register_expr(&nft_meta_bridge_type); | |
127 | } | |
128 | ||
129 | static void __exit nft_meta_bridge_module_exit(void) | |
130 | { | |
131 | nft_unregister_expr(&nft_meta_bridge_type); | |
132 | } | |
133 | ||
134 | module_init(nft_meta_bridge_module_init); | |
135 | module_exit(nft_meta_bridge_module_exit); | |
136 | ||
137 | MODULE_LICENSE("GPL"); | |
138 | MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>"); | |
139 | MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "meta"); |