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/* iptables module for using new netfilter netlink queue
*
* (C) 2005 by Harald Welte <laforge@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/jhash.h>
#include <linux/netfilter.h>
#include <linux/netfilter_arp.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_NFQUEUE.h>
MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
MODULE_DESCRIPTION("Xtables: packet forwarding to netlink");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_NFQUEUE");
MODULE_ALIAS("ip6t_NFQUEUE");
MODULE_ALIAS("arpt_NFQUEUE");
static u32 jhash_initval __read_mostly;
static bool rnd_inited __read_mostly;
static unsigned int
nfqueue_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct xt_NFQ_info *tinfo = par->targinfo;
return NF_QUEUE_NR(tinfo->queuenum);
}
static u32 hash_v4(const struct sk_buff *skb)
{
const struct iphdr *iph = ip_hdr(skb);
__be32 ipaddr;
/* packets in either direction go into same queue */
ipaddr = iph->saddr ^ iph->daddr;
return jhash_2words((__force u32)ipaddr, iph->protocol, jhash_initval);
}
#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
static u32 hash_v6(const struct sk_buff *skb)
{
const struct ipv6hdr *ip6h = ipv6_hdr(skb);
__be32 addr[4];
addr[0] = ip6h->saddr.s6_addr32[0] ^ ip6h->daddr.s6_addr32[0];
addr[1] = ip6h->saddr.s6_addr32[1] ^ ip6h->daddr.s6_addr32[1];
addr[2] = ip6h->saddr.s6_addr32[2] ^ ip6h->daddr.s6_addr32[2];
addr[3] = ip6h->saddr.s6_addr32[3] ^ ip6h->daddr.s6_addr32[3];
return jhash2((__force u32 *)addr, ARRAY_SIZE(addr), jhash_initval);
}
#endif
static unsigned int
nfqueue_tg_v1(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct xt_NFQ_info_v1 *info = par->targinfo;
u32 queue = info->queuenum;
if (info->queues_total > 1) {
if (par->family == NFPROTO_IPV4)
queue = hash_v4(skb) % info->queues_total + queue;
#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
else if (par->family == NFPROTO_IPV6)
queue = hash_v6(skb) % info->queues_total + queue;
#endif
}
return NF_QUEUE_NR(queue);
}
static int nfqueue_tg_v1_check(const struct xt_tgchk_param *par)
{
const struct xt_NFQ_info_v1 *info = par->targinfo;
u32 maxid;
if (unlikely(!rnd_inited)) {
get_random_bytes(&jhash_initval, sizeof(jhash_initval));
rnd_inited = true;
}
if (info->queues_total == 0) {
pr_err("NFQUEUE: number of total queues is 0\n");
return -EINVAL;
}
maxid = info->queues_total - 1 + info->queuenum;
if (maxid > 0xffff) {
pr_err("NFQUEUE: number of queues (%u) out of range (got %u)\n",
info->queues_total, maxid);
return -ERANGE;
}
return 0;
}
static struct xt_target nfqueue_tg_reg[] __read_mostly = {
{
.name = "NFQUEUE",
.family = NFPROTO_UNSPEC,
.target = nfqueue_tg,
.targetsize = sizeof(struct xt_NFQ_info),
.me = THIS_MODULE,
},
{
.name = "NFQUEUE",
.revision = 1,
.family = NFPROTO_UNSPEC,
.checkentry = nfqueue_tg_v1_check,
.target = nfqueue_tg_v1,
.targetsize = sizeof(struct xt_NFQ_info_v1),
.me = THIS_MODULE,
},
};
static int __init nfqueue_tg_init(void)
{
return xt_register_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
}
static void __exit nfqueue_tg_exit(void)
{
xt_unregister_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
}
module_init(nfqueue_tg_init);
module_exit(nfqueue_tg_exit);
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