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0aff078d EL |
1 | /* |
2 | * Copyright (c) 2013 Eric Leblond <eric@regit.org> | |
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 partly funded by OISF | |
9 | * (http://www.openinfosecfoundation.org/) | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/netlink.h> | |
16 | #include <linux/jhash.h> | |
17 | #include <linux/netfilter.h> | |
18 | #include <linux/netfilter/nf_tables.h> | |
19 | #include <net/netfilter/nf_tables.h> | |
20 | #include <net/netfilter/nf_queue.h> | |
21 | ||
22 | static u32 jhash_initval __read_mostly; | |
23 | ||
24 | struct nft_queue { | |
25 | u16 queuenum; | |
26 | u16 queues_total; | |
27 | u16 flags; | |
0aff078d EL |
28 | }; |
29 | ||
30 | static void nft_queue_eval(const struct nft_expr *expr, | |
31 | struct nft_data data[NFT_REG_MAX + 1], | |
32 | const struct nft_pktinfo *pkt) | |
33 | { | |
34 | struct nft_queue *priv = nft_expr_priv(expr); | |
35 | u32 queue = priv->queuenum; | |
36 | u32 ret; | |
37 | ||
38 | if (priv->queues_total > 1) { | |
39 | if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT) { | |
40 | int cpu = smp_processor_id(); | |
41 | ||
42 | queue = priv->queuenum + cpu % priv->queues_total; | |
43 | } else { | |
44 | queue = nfqueue_hash(pkt->skb, queue, | |
b8ecbee6 | 45 | priv->queues_total, pkt->ops->pf, |
0aff078d EL |
46 | jhash_initval); |
47 | } | |
48 | } | |
49 | ||
50 | ret = NF_QUEUE_NR(queue); | |
51 | if (priv->flags & NFT_QUEUE_FLAG_BYPASS) | |
52 | ret |= NF_VERDICT_FLAG_QUEUE_BYPASS; | |
53 | ||
54 | data[NFT_REG_VERDICT].verdict = ret; | |
55 | } | |
56 | ||
57 | static const struct nla_policy nft_queue_policy[NFTA_QUEUE_MAX + 1] = { | |
58 | [NFTA_QUEUE_NUM] = { .type = NLA_U16 }, | |
59 | [NFTA_QUEUE_TOTAL] = { .type = NLA_U16 }, | |
60 | [NFTA_QUEUE_FLAGS] = { .type = NLA_U16 }, | |
61 | }; | |
62 | ||
63 | static int nft_queue_init(const struct nft_ctx *ctx, | |
64 | const struct nft_expr *expr, | |
65 | const struct nlattr * const tb[]) | |
66 | { | |
67 | struct nft_queue *priv = nft_expr_priv(expr); | |
68 | ||
69 | if (tb[NFTA_QUEUE_NUM] == NULL) | |
70 | return -EINVAL; | |
71 | ||
72 | init_hashrandom(&jhash_initval); | |
0aff078d EL |
73 | priv->queuenum = ntohs(nla_get_be16(tb[NFTA_QUEUE_NUM])); |
74 | ||
75 | if (tb[NFTA_QUEUE_TOTAL] != NULL) | |
76 | priv->queues_total = ntohs(nla_get_be16(tb[NFTA_QUEUE_TOTAL])); | |
77 | if (tb[NFTA_QUEUE_FLAGS] != NULL) { | |
78 | priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS])); | |
79 | if (priv->flags & ~NFT_QUEUE_FLAG_MASK) | |
80 | return -EINVAL; | |
81 | } | |
82 | return 0; | |
83 | } | |
84 | ||
85 | static int nft_queue_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
86 | { | |
87 | const struct nft_queue *priv = nft_expr_priv(expr); | |
88 | ||
89 | if (nla_put_be16(skb, NFTA_QUEUE_NUM, htons(priv->queuenum)) || | |
90 | nla_put_be16(skb, NFTA_QUEUE_TOTAL, htons(priv->queues_total)) || | |
91 | nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags))) | |
92 | goto nla_put_failure; | |
93 | ||
94 | return 0; | |
95 | ||
96 | nla_put_failure: | |
97 | return -1; | |
98 | } | |
99 | ||
100 | static struct nft_expr_type nft_queue_type; | |
101 | static const struct nft_expr_ops nft_queue_ops = { | |
102 | .type = &nft_queue_type, | |
103 | .size = NFT_EXPR_SIZE(sizeof(struct nft_queue)), | |
104 | .eval = nft_queue_eval, | |
105 | .init = nft_queue_init, | |
106 | .dump = nft_queue_dump, | |
107 | }; | |
108 | ||
109 | static struct nft_expr_type nft_queue_type __read_mostly = { | |
110 | .name = "queue", | |
111 | .ops = &nft_queue_ops, | |
112 | .policy = nft_queue_policy, | |
113 | .maxattr = NFTA_QUEUE_MAX, | |
114 | .owner = THIS_MODULE, | |
115 | }; | |
116 | ||
117 | static int __init nft_queue_module_init(void) | |
118 | { | |
119 | return nft_register_expr(&nft_queue_type); | |
120 | } | |
121 | ||
122 | static void __exit nft_queue_module_exit(void) | |
123 | { | |
124 | nft_unregister_expr(&nft_queue_type); | |
125 | } | |
126 | ||
127 | module_init(nft_queue_module_init); | |
128 | module_exit(nft_queue_module_exit); | |
129 | ||
130 | MODULE_LICENSE("GPL"); | |
131 | MODULE_AUTHOR("Eric Leblond <eric@regit.org>"); | |
132 | MODULE_ALIAS_NFT_EXPR("queue"); |