lis3: add support for the HP EliteBook 8530w
[linux-2.6/mini2440.git] / net / netfilter / xt_NFQUEUE.c
blobf28f6a5fc02d96aa79acce6e57a8968026250387
1 /* iptables module for using new netfilter netlink queue
3 * (C) 2005 by Harald Welte <laforge@netfilter.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 */
11 #include <linux/module.h>
12 #include <linux/skbuff.h>
14 #include <linux/ip.h>
15 #include <linux/ipv6.h>
16 #include <linux/jhash.h>
18 #include <linux/netfilter.h>
19 #include <linux/netfilter_arp.h>
20 #include <linux/netfilter/x_tables.h>
21 #include <linux/netfilter/xt_NFQUEUE.h>
23 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
24 MODULE_DESCRIPTION("Xtables: packet forwarding to netlink");
25 MODULE_LICENSE("GPL");
26 MODULE_ALIAS("ipt_NFQUEUE");
27 MODULE_ALIAS("ip6t_NFQUEUE");
28 MODULE_ALIAS("arpt_NFQUEUE");
30 static u32 jhash_initval __read_mostly;
32 static unsigned int
33 nfqueue_tg(struct sk_buff *skb, const struct xt_target_param *par)
35 const struct xt_NFQ_info *tinfo = par->targinfo;
37 return NF_QUEUE_NR(tinfo->queuenum);
40 static u32 hash_v4(const struct sk_buff *skb)
42 const struct iphdr *iph = ip_hdr(skb);
43 __be32 ipaddr;
45 /* packets in either direction go into same queue */
46 ipaddr = iph->saddr ^ iph->daddr;
48 return jhash_2words((__force u32)ipaddr, iph->protocol, jhash_initval);
51 static unsigned int
52 nfqueue_tg4_v1(struct sk_buff *skb, const struct xt_target_param *par)
54 const struct xt_NFQ_info_v1 *info = par->targinfo;
55 u32 queue = info->queuenum;
57 if (info->queues_total > 1)
58 queue = hash_v4(skb) % info->queues_total + queue;
59 return NF_QUEUE_NR(queue);
62 #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
63 static u32 hash_v6(const struct sk_buff *skb)
65 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
66 __be32 addr[4];
68 addr[0] = ip6h->saddr.s6_addr32[0] ^ ip6h->daddr.s6_addr32[0];
69 addr[1] = ip6h->saddr.s6_addr32[1] ^ ip6h->daddr.s6_addr32[1];
70 addr[2] = ip6h->saddr.s6_addr32[2] ^ ip6h->daddr.s6_addr32[2];
71 addr[3] = ip6h->saddr.s6_addr32[3] ^ ip6h->daddr.s6_addr32[3];
73 return jhash2((__force u32 *)addr, ARRAY_SIZE(addr), jhash_initval);
76 static unsigned int
77 nfqueue_tg6_v1(struct sk_buff *skb, const struct xt_target_param *par)
79 const struct xt_NFQ_info_v1 *info = par->targinfo;
80 u32 queue = info->queuenum;
82 if (info->queues_total > 1)
83 queue = hash_v6(skb) % info->queues_total + queue;
84 return NF_QUEUE_NR(queue);
86 #endif
88 static bool nfqueue_tg_v1_check(const struct xt_tgchk_param *par)
90 const struct xt_NFQ_info_v1 *info = par->targinfo;
91 u32 maxid;
93 if (info->queues_total == 0) {
94 pr_err("NFQUEUE: number of total queues is 0\n");
95 return false;
97 maxid = info->queues_total - 1 + info->queuenum;
98 if (maxid > 0xffff) {
99 pr_err("NFQUEUE: number of queues (%u) out of range (got %u)\n",
100 info->queues_total, maxid);
101 return false;
103 return true;
106 static struct xt_target nfqueue_tg_reg[] __read_mostly = {
108 .name = "NFQUEUE",
109 .family = NFPROTO_UNSPEC,
110 .target = nfqueue_tg,
111 .targetsize = sizeof(struct xt_NFQ_info),
112 .me = THIS_MODULE,
115 .name = "NFQUEUE",
116 .revision = 1,
117 .family = NFPROTO_IPV4,
118 .checkentry = nfqueue_tg_v1_check,
119 .target = nfqueue_tg4_v1,
120 .targetsize = sizeof(struct xt_NFQ_info_v1),
121 .me = THIS_MODULE,
123 #if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
125 .name = "NFQUEUE",
126 .revision = 1,
127 .family = NFPROTO_IPV6,
128 .checkentry = nfqueue_tg_v1_check,
129 .target = nfqueue_tg6_v1,
130 .targetsize = sizeof(struct xt_NFQ_info_v1),
131 .me = THIS_MODULE,
133 #endif
136 static int __init nfqueue_tg_init(void)
138 get_random_bytes(&jhash_initval, sizeof(jhash_initval));
139 return xt_register_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
142 static void __exit nfqueue_tg_exit(void)
144 xt_unregister_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
147 module_init(nfqueue_tg_init);
148 module_exit(nfqueue_tg_exit);