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@xxxxxxxxxx>
Signed-off-by: Florian Westphal <fwestphal@xxxxxxxxxx>
---
include/linux/netfilter/xt_NFQUEUE.h | 5 ++
net/netfilter/xt_NFQUEUE.c | 93 ++++++++++++++++++++++++++++++++++
2 files changed, 98 insertions(+), 0 deletions(-)
diff --git a/include/linux/netfilter/xt_NFQUEUE.h b/include/linux/netfilter/xt_NFQUEUE.h
index 982a89f..2584f4a 100644
--- a/include/linux/netfilter/xt_NFQUEUE.h
+++ b/include/linux/netfilter/xt_NFQUEUE.h
@@ -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 */
diff --git a/net/netfilter/xt_NFQUEUE.c b/net/netfilter/xt_NFQUEUE.c
index 6e0f84d..2215b7a 100644
--- a/net/netfilter/xt_NFQUEUE.c
+++ b/net/netfilter/xt_NFQUEUE.c
@@ -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, 4, 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) {
+ printk(KERN_ERR "NFQUEUE: number of total queues is 0\n");
+ return false;
+ }
+ maxid = info->queues_total - 1 + info->queuenum;
+ if (maxid > 0xffff) {
+ printk(KERN_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));
}
--
1.6.0.6
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