Commit | Line | Data |
---|---|---|
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, | |
a55e22e9 | 31 | struct nft_regs *regs, |
0aff078d EL |
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, | |
6aa187f2 | 45 | priv->queues_total, pkt->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 | ||
a55e22e9 | 54 | regs->verdict.code = ret; |
0aff078d EL |
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); | |
fe01111d | 68 | u32 maxid; |
0aff078d EL |
69 | |
70 | if (tb[NFTA_QUEUE_NUM] == NULL) | |
71 | return -EINVAL; | |
72 | ||
73 | init_hashrandom(&jhash_initval); | |
0aff078d EL |
74 | priv->queuenum = ntohs(nla_get_be16(tb[NFTA_QUEUE_NUM])); |
75 | ||
76 | if (tb[NFTA_QUEUE_TOTAL] != NULL) | |
77 | priv->queues_total = ntohs(nla_get_be16(tb[NFTA_QUEUE_TOTAL])); | |
fe01111d LZ |
78 | else |
79 | priv->queues_total = 1; | |
80 | ||
81 | if (priv->queues_total == 0) | |
82 | return -EINVAL; | |
83 | ||
84 | maxid = priv->queues_total - 1 + priv->queuenum; | |
85 | if (maxid > U16_MAX) | |
86 | return -ERANGE; | |
87 | ||
0aff078d EL |
88 | if (tb[NFTA_QUEUE_FLAGS] != NULL) { |
89 | priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS])); | |
90 | if (priv->flags & ~NFT_QUEUE_FLAG_MASK) | |
91 | return -EINVAL; | |
92 | } | |
93 | return 0; | |
94 | } | |
95 | ||
96 | static int nft_queue_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
97 | { | |
98 | const struct nft_queue *priv = nft_expr_priv(expr); | |
99 | ||
100 | if (nla_put_be16(skb, NFTA_QUEUE_NUM, htons(priv->queuenum)) || | |
101 | nla_put_be16(skb, NFTA_QUEUE_TOTAL, htons(priv->queues_total)) || | |
102 | nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags))) | |
103 | goto nla_put_failure; | |
104 | ||
105 | return 0; | |
106 | ||
107 | nla_put_failure: | |
108 | return -1; | |
109 | } | |
110 | ||
111 | static struct nft_expr_type nft_queue_type; | |
112 | static const struct nft_expr_ops nft_queue_ops = { | |
113 | .type = &nft_queue_type, | |
114 | .size = NFT_EXPR_SIZE(sizeof(struct nft_queue)), | |
115 | .eval = nft_queue_eval, | |
116 | .init = nft_queue_init, | |
117 | .dump = nft_queue_dump, | |
118 | }; | |
119 | ||
120 | static struct nft_expr_type nft_queue_type __read_mostly = { | |
121 | .name = "queue", | |
122 | .ops = &nft_queue_ops, | |
123 | .policy = nft_queue_policy, | |
124 | .maxattr = NFTA_QUEUE_MAX, | |
125 | .owner = THIS_MODULE, | |
126 | }; | |
127 | ||
128 | static int __init nft_queue_module_init(void) | |
129 | { | |
130 | return nft_register_expr(&nft_queue_type); | |
131 | } | |
132 | ||
133 | static void __exit nft_queue_module_exit(void) | |
134 | { | |
135 | nft_unregister_expr(&nft_queue_type); | |
136 | } | |
137 | ||
138 | module_init(nft_queue_module_init); | |
139 | module_exit(nft_queue_module_exit); | |
140 | ||
141 | MODULE_LICENSE("GPL"); | |
142 | MODULE_AUTHOR("Eric Leblond <eric@regit.org>"); | |
143 | MODULE_ALIAS_NFT_EXPR("queue"); |