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96518518 PM |
1 | /* |
2 | * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> | |
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 | * Development of this code funded by Astaro AG (http://www.astaro.com/) | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/rbtree.h> | |
15 | #include <linux/netlink.h> | |
16 | #include <linux/netfilter.h> | |
17 | #include <linux/netfilter/nf_tables.h> | |
18 | #include <net/netfilter/nf_tables.h> | |
19 | ||
20 | struct nft_meta { | |
21 | enum nft_meta_keys key; | |
22 | }; | |
23 | ||
24 | static void nft_meta_eval(const struct nft_expr *expr, | |
25 | struct nft_data *nfres, | |
26 | struct nft_data *data, | |
27 | const struct nft_pktinfo *pkt) | |
28 | { | |
29 | const struct nft_meta *meta = nft_expr_priv(expr); | |
30 | struct sk_buff *skb = pkt->skb; | |
31 | u32 val = data->data[0]; | |
32 | ||
33 | switch (meta->key) { | |
34 | case NFT_META_MARK: | |
35 | skb->mark = val; | |
36 | break; | |
37 | case NFT_META_PRIORITY: | |
38 | skb->priority = val; | |
39 | break; | |
40 | case NFT_META_NFTRACE: | |
41 | skb->nf_trace = val; | |
42 | break; | |
43 | #ifdef CONFIG_NETWORK_SECMARK | |
44 | case NFT_META_SECMARK: | |
45 | skb->secmark = val; | |
46 | break; | |
47 | #endif | |
48 | default: | |
49 | WARN_ON(1); | |
50 | } | |
51 | } | |
52 | ||
53 | static const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = { | |
54 | [NFTA_META_KEY] = { .type = NLA_U32 }, | |
55 | }; | |
56 | ||
57 | static int nft_meta_init(const struct nft_expr *expr, struct nlattr *tb[]) | |
58 | { | |
59 | struct nft_meta *meta = nft_expr_priv(expr); | |
60 | ||
61 | if (tb[NFTA_META_KEY] == NULL) | |
62 | return -EINVAL; | |
63 | ||
64 | meta->key = ntohl(nla_get_be32(tb[NFTA_META_KEY])); | |
65 | switch (meta->key) { | |
66 | case NFT_META_MARK: | |
67 | case NFT_META_PRIORITY: | |
68 | case NFT_META_NFTRACE: | |
69 | #ifdef CONFIG_NETWORK_SECMARK | |
70 | case NFT_META_SECMARK: | |
71 | #endif | |
72 | break; | |
73 | default: | |
74 | return -EINVAL; | |
75 | } | |
76 | ||
77 | return 0; | |
78 | } | |
79 | ||
80 | static int nft_meta_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
81 | { | |
82 | struct nft_meta *meta = nft_expr_priv(expr); | |
83 | ||
84 | NLA_PUT_BE32(skb, NFTA_META_KEY, htonl(meta->key)); | |
85 | return 0; | |
86 | ||
87 | nla_put_failure: | |
88 | return -1; | |
89 | } | |
90 | ||
91 | static struct nft_expr_ops meta_target __read_mostly = { | |
92 | .name = "meta", | |
93 | .size = NFT_EXPR_SIZE(sizeof(struct nft_meta)), | |
94 | .owner = THIS_MODULE, | |
95 | .eval = nft_meta_eval, | |
96 | .init = nft_meta_init, | |
97 | .dump = nft_meta_dump, | |
98 | .policy = nft_meta_policy, | |
99 | .maxattr = NFTA_META_MAX, | |
100 | }; | |
101 | ||
102 | static int __init nft_meta_target_init(void) | |
103 | { | |
104 | return nft_register_expr(&meta_target); | |
105 | } | |
106 | ||
107 | static void __exit nft_meta_target_exit(void) | |
108 | { | |
109 | nft_unregister_expr(&meta_target); | |
110 | } | |
111 | ||
112 | module_init(nft_meta_target_init); | |
113 | module_exit(nft_meta_target_exit); | |
114 | ||
115 | MODULE_LICENSE("GPL"); | |
116 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
117 | MODULE_ALIAS_NFT_EXPR("meta"); |