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netfilter: xt_NFQUEUE: queue balancing support

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Adds support for specifying a range of queues instead of a single queue
id. Flows will be distributed across the given range.

This is useful for multicore systems: Instead of having a single
application read packets from a queue, start multiple
instances on queues x, x+1, .. x+n. Each instance can process
flows independently.

Packets for the same connection are put into the same queue.

Signed-off-by: Holger Eitzenberger <heitzenberger@astaro.com>
Signed-off-by: Florian Westphal <fwestphal@astaro.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Florian Westphal 2009-06-05 13:24:24 +02:00 committed by Patrick McHardy
parent 61f5abcab1
commit 10662aa308
2 changed files with 98 additions and 0 deletions
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5
include/linux/netfilter/xt_NFQUEUE.h
View file

@ -15,4 +15,9 @@ struct xt_NFQ_info {
__u16 queuenum;
};
struct xt_NFQ_info_v1 {
__u16 queuenum;
__u16 queues_total;
};
#endif /* _XT_NFQ_TARGET_H */

93
net/netfilter/xt_NFQUEUE.c
View file

@ -11,6 +11,10 @@
#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>
@ -23,6 +27,8 @@ MODULE_ALIAS("ipt_NFQUEUE");
MODULE_ALIAS("ip6t_NFQUEUE");
MODULE_ALIAS("arpt_NFQUEUE");
static u32 jhash_initval __read_mostly;
static unsigned int
nfqueue_tg(struct sk_buff *skb, const struct xt_target_param *par)
{
@ -31,6 +37,72 @@ nfqueue_tg(struct sk_buff *skb, const struct xt_target_param *par)
return NF_QUEUE_NR(tinfo->queuenum);
}
static u32 hash_v4(const struct sk_buff *skb)
{
const struct iphdr *iph = ip_hdr(skb);
u32 ipaddr;
/* packets in either direction go into same queue */
ipaddr = iph->saddr ^ iph->daddr;
return jhash_2words(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);
u32 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(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 nfqueue_tg_reg[] __read_mostly = {
{
.name = "NFQUEUE",
@ -39,10 +111,31 @@ static struct xt_target nfqueue_tg_reg[] __read_mostly = {
.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 nfqueue_tg_init(void)
{
get_random_bytes(&jhash_initval, sizeof(jhash_initval));
return xt_register_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
}