* (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
+ * 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("[ip,ip6,arp]_tables NFQUEUE target");
+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 unsigned int
-target(struct sk_buff **pskb,
- const struct net_device *in,
- const struct net_device *out,
- unsigned int hooknum,
- const struct xt_target *target,
- const void *targinfo,
- void *userinfo)
+nfqueue_tg(struct sk_buff *skb, const struct xt_target_param *par)
{
- const struct xt_NFQ_info *tinfo = targinfo;
+ const struct xt_NFQ_info *tinfo = par->targinfo;
return NF_QUEUE_NR(tinfo->queuenum);
}
-static struct xt_target ipt_NFQ_reg = {
- .name = "NFQUEUE",
- .target = target,
- .targetsize = sizeof(struct xt_NFQ_info),
- .family = AF_INET,
- .me = THIS_MODULE,
-};
+static u32 hash_v4(const struct sk_buff *skb)
+{
+ const struct iphdr *iph = ip_hdr(skb);
+ __be32 ipaddr;
-static struct xt_target ip6t_NFQ_reg = {
- .name = "NFQUEUE",
- .target = target,
- .targetsize = sizeof(struct xt_NFQ_info),
- .family = AF_INET6,
- .me = THIS_MODULE,
-};
+ /* packets in either direction go into same queue */
+ ipaddr = iph->saddr ^ iph->daddr;
+
+ return jhash_2words((__force u32)ipaddr, iph->protocol, jhash_initval);
+}
+
+static unsigned int
+nfqueue_tg4_v1(struct sk_buff *skb, const struct xt_target_param *par)
+{
+ const struct xt_NFQ_info_v1 *info = par->targinfo;
+ u32 queue = info->queuenum;
+
+ if (info->queues_total > 1)
+ queue = hash_v4(skb) % info->queues_total + queue;
+ return NF_QUEUE_NR(queue);
+}
+
+#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);
+}
+
+static unsigned int
+nfqueue_tg6_v1(struct sk_buff *skb, const struct xt_target_param *par)
+{
+ const struct xt_NFQ_info_v1 *info = par->targinfo;
+ u32 queue = info->queuenum;
+
+ if (info->queues_total > 1)
+ queue = hash_v6(skb) % info->queues_total + queue;
+ return NF_QUEUE_NR(queue);
+}
+#endif
+
+static bool nfqueue_tg_v1_check(const struct xt_tgchk_param *par)
+{
+ const struct xt_NFQ_info_v1 *info = par->targinfo;
+ u32 maxid;
+
+ if (info->queues_total == 0) {
+ pr_err("NFQUEUE: number of total queues is 0\n");
+ return false;
+ }
+ 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 false;
+ }
+ return true;
+}
-static struct xt_target arpt_NFQ_reg = {
- .name = "NFQUEUE",
- .target = target,
- .targetsize = sizeof(struct xt_NFQ_info),
- .family = NF_ARP,
- .me = THIS_MODULE,
+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_IPV4,
+ .checkentry = nfqueue_tg_v1_check,
+ .target = nfqueue_tg4_v1,
+ .targetsize = sizeof(struct xt_NFQ_info_v1),
+ .me = THIS_MODULE,
+ },
+#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
+ {
+ .name = "NFQUEUE",
+ .revision = 1,
+ .family = NFPROTO_IPV6,
+ .checkentry = nfqueue_tg_v1_check,
+ .target = nfqueue_tg6_v1,
+ .targetsize = sizeof(struct xt_NFQ_info_v1),
+ .me = THIS_MODULE,
+ },
+#endif
};
-static int __init init(void)
+static int __init nfqueue_tg_init(void)
{
- int ret;
- ret = xt_register_target(&ipt_NFQ_reg);
- if (ret)
- return ret;
- ret = xt_register_target(&ip6t_NFQ_reg);
- if (ret)
- goto out_ip;
- ret = xt_register_target(&arpt_NFQ_reg);
- if (ret)
- goto out_ip6;
-
- return ret;
-out_ip6:
- xt_unregister_target(&ip6t_NFQ_reg);
-out_ip:
- xt_unregister_target(&ipt_NFQ_reg);
-
- return ret;
+ get_random_bytes(&jhash_initval, sizeof(jhash_initval));
+ return xt_register_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
}
-static void __exit fini(void)
+static void __exit nfqueue_tg_exit(void)
{
- xt_unregister_target(&arpt_NFQ_reg);
- xt_unregister_target(&ip6t_NFQ_reg);
- xt_unregister_target(&ipt_NFQ_reg);
+ xt_unregister_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
}
-module_init(init);
-module_exit(fini);
+module_init(nfqueue_tg_init);
+module_exit(nfqueue_tg_exit);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff