Commit | Line | Data |
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2e4e6a17 HW |
1 | /* iptables module for using new netfilter netlink queue |
2 | * | |
3 | * (C) 2005 by Harald Welte <laforge@netfilter.org> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
601e68e1 | 6 | * it under the terms of the GNU General Public License version 2 as |
2e4e6a17 | 7 | * published by the Free Software Foundation. |
601e68e1 | 8 | * |
2e4e6a17 HW |
9 | */ |
10 | ||
e016c5e4 FW |
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
12 | ||
2e4e6a17 HW |
13 | #include <linux/module.h> |
14 | #include <linux/skbuff.h> | |
15 | ||
16 | #include <linux/netfilter.h> | |
17 | #include <linux/netfilter_arp.h> | |
18 | #include <linux/netfilter/x_tables.h> | |
19 | #include <linux/netfilter/xt_NFQUEUE.h> | |
20 | ||
97a2d41c EL |
21 | #include <net/netfilter/nf_queue.h> |
22 | ||
2e4e6a17 | 23 | MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>"); |
2ae15b64 | 24 | MODULE_DESCRIPTION("Xtables: packet forwarding to netlink"); |
2e4e6a17 HW |
25 | MODULE_LICENSE("GPL"); |
26 | MODULE_ALIAS("ipt_NFQUEUE"); | |
27 | MODULE_ALIAS("ip6t_NFQUEUE"); | |
28 | MODULE_ALIAS("arpt_NFQUEUE"); | |
29 | ||
10662aa3 FW |
30 | static u32 jhash_initval __read_mostly; |
31 | ||
2e4e6a17 | 32 | static unsigned int |
4b560b44 | 33 | nfqueue_tg(struct sk_buff *skb, const struct xt_action_param *par) |
2e4e6a17 | 34 | { |
7eb35586 | 35 | const struct xt_NFQ_info *tinfo = par->targinfo; |
2e4e6a17 HW |
36 | |
37 | return NF_QUEUE_NR(tinfo->queuenum); | |
38 | } | |
39 | ||
5c33448c | 40 | static unsigned int |
41 | nfqueue_tg_v1(struct sk_buff *skb, const struct xt_action_param *par) | |
42 | { | |
43 | const struct xt_NFQ_info_v1 *info = par->targinfo; | |
44 | u32 queue = info->queuenum; | |
45 | ||
97a2d41c EL |
46 | if (info->queues_total > 1) { |
47 | queue = nfqueue_hash(skb, queue, info->queues_total, | |
613dbd95 | 48 | xt_family(par), jhash_initval); |
97a2d41c | 49 | } |
10662aa3 FW |
50 | return NF_QUEUE_NR(queue); |
51 | } | |
10662aa3 | 52 | |
94b27cc3 FW |
53 | static unsigned int |
54 | nfqueue_tg_v2(struct sk_buff *skb, const struct xt_action_param *par) | |
10662aa3 | 55 | { |
94b27cc3 FW |
56 | const struct xt_NFQ_info_v2 *info = par->targinfo; |
57 | unsigned int ret = nfqueue_tg_v1(skb, par); | |
58 | ||
59 | if (info->bypass) | |
60 | ret |= NF_VERDICT_FLAG_QUEUE_BYPASS; | |
61 | return ret; | |
62 | } | |
63 | ||
64 | static int nfqueue_tg_check(const struct xt_tgchk_param *par) | |
65 | { | |
8746ddcf | 66 | const struct xt_NFQ_info_v3 *info = par->targinfo; |
10662aa3 FW |
67 | u32 maxid; |
68 | ||
97a2d41c EL |
69 | init_hashrandom(&jhash_initval); |
70 | ||
10662aa3 | 71 | if (info->queues_total == 0) { |
e016c5e4 | 72 | pr_info_ratelimited("number of total queues is 0\n"); |
d6b00a53 | 73 | return -EINVAL; |
10662aa3 FW |
74 | } |
75 | maxid = info->queues_total - 1 + info->queuenum; | |
76 | if (maxid > 0xffff) { | |
e016c5e4 FW |
77 | pr_info_ratelimited("number of queues (%u) out of range (got %u)\n", |
78 | info->queues_total, maxid); | |
4a5a5c73 | 79 | return -ERANGE; |
10662aa3 | 80 | } |
8746ddcf | 81 | if (par->target->revision == 2 && info->flags > 1) |
82 | return -EINVAL; | |
83 | if (par->target->revision == 3 && info->flags & ~NFQ_FLAG_MASK) | |
94b27cc3 | 84 | return -EINVAL; |
8746ddcf | 85 | |
d6b00a53 | 86 | return 0; |
10662aa3 FW |
87 | } |
88 | ||
8746ddcf | 89 | static unsigned int |
90 | nfqueue_tg_v3(struct sk_buff *skb, const struct xt_action_param *par) | |
91 | { | |
92 | const struct xt_NFQ_info_v3 *info = par->targinfo; | |
93 | u32 queue = info->queuenum; | |
d9547773 | 94 | int ret; |
8746ddcf | 95 | |
96 | if (info->queues_total > 1) { | |
97 | if (info->flags & NFQ_FLAG_CPU_FANOUT) { | |
98 | int cpu = smp_processor_id(); | |
99 | ||
100 | queue = info->queuenum + cpu % info->queues_total; | |
97a2d41c EL |
101 | } else { |
102 | queue = nfqueue_hash(skb, queue, info->queues_total, | |
613dbd95 | 103 | xt_family(par), jhash_initval); |
97a2d41c | 104 | } |
8746ddcf | 105 | } |
5c33448c | 106 | |
d9547773 HE |
107 | ret = NF_QUEUE_NR(queue); |
108 | if (info->flags & NFQ_FLAG_BYPASS) | |
109 | ret |= NF_VERDICT_FLAG_QUEUE_BYPASS; | |
110 | ||
111 | return ret; | |
8746ddcf | 112 | } |
113 | ||
d3c5ee6d | 114 | static struct xt_target nfqueue_tg_reg[] __read_mostly = { |
4470bbc7 PM |
115 | { |
116 | .name = "NFQUEUE", | |
61f5abca | 117 | .family = NFPROTO_UNSPEC, |
d3c5ee6d | 118 | .target = nfqueue_tg, |
4470bbc7 PM |
119 | .targetsize = sizeof(struct xt_NFQ_info), |
120 | .me = THIS_MODULE, | |
121 | }, | |
10662aa3 FW |
122 | { |
123 | .name = "NFQUEUE", | |
124 | .revision = 1, | |
f76a47c8 | 125 | .family = NFPROTO_UNSPEC, |
94b27cc3 | 126 | .checkentry = nfqueue_tg_check, |
f76a47c8 | 127 | .target = nfqueue_tg_v1, |
10662aa3 FW |
128 | .targetsize = sizeof(struct xt_NFQ_info_v1), |
129 | .me = THIS_MODULE, | |
130 | }, | |
94b27cc3 FW |
131 | { |
132 | .name = "NFQUEUE", | |
133 | .revision = 2, | |
134 | .family = NFPROTO_UNSPEC, | |
135 | .checkentry = nfqueue_tg_check, | |
136 | .target = nfqueue_tg_v2, | |
137 | .targetsize = sizeof(struct xt_NFQ_info_v2), | |
138 | .me = THIS_MODULE, | |
139 | }, | |
8746ddcf | 140 | { |
141 | .name = "NFQUEUE", | |
142 | .revision = 3, | |
143 | .family = NFPROTO_UNSPEC, | |
144 | .checkentry = nfqueue_tg_check, | |
145 | .target = nfqueue_tg_v3, | |
146 | .targetsize = sizeof(struct xt_NFQ_info_v3), | |
147 | .me = THIS_MODULE, | |
148 | }, | |
2e4e6a17 HW |
149 | }; |
150 | ||
d3c5ee6d | 151 | static int __init nfqueue_tg_init(void) |
2e4e6a17 | 152 | { |
d3c5ee6d | 153 | return xt_register_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg)); |
2e4e6a17 HW |
154 | } |
155 | ||
d3c5ee6d | 156 | static void __exit nfqueue_tg_exit(void) |
2e4e6a17 | 157 | { |
d3c5ee6d | 158 | xt_unregister_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg)); |
2e4e6a17 HW |
159 | } |
160 | ||
d3c5ee6d JE |
161 | module_init(nfqueue_tg_init); |
162 | module_exit(nfqueue_tg_exit); |