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/*
* Copyright (c) 2013 Eric Leblond <eric@regit.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.
*
* Development of this code partly funded by OISF
* (http://www.openinfosecfoundation.org/)
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/jhash.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_queue.h>
static u32 jhash_initval __read_mostly;
struct nft_queue {
u16 queuenum;
u16 queues_total;
u16 flags;
};
static void nft_queue_eval(const struct nft_expr *expr,
struct nft_data data[NFT_REG_MAX + 1],
const struct nft_pktinfo *pkt)
{
struct nft_queue *priv = nft_expr_priv(expr);
u32 queue = priv->queuenum;
u32 ret;
if (priv->queues_total > 1) {
if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT) {
int cpu = smp_processor_id();
queue = priv->queuenum + cpu % priv->queues_total;
} else {
queue = nfqueue_hash(pkt->skb, queue,
priv->queues_total, pkt->ops->pf,
jhash_initval);
}
}
ret = NF_QUEUE_NR(queue);
if (priv->flags & NFT_QUEUE_FLAG_BYPASS)
ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
data[NFT_REG_VERDICT].verdict = ret;
}
static const struct nla_policy nft_queue_policy[NFTA_QUEUE_MAX + 1] = {
[NFTA_QUEUE_NUM] = { .type = NLA_U16 },
[NFTA_QUEUE_TOTAL] = { .type = NLA_U16 },
[NFTA_QUEUE_FLAGS] = { .type = NLA_U16 },
};
static int nft_queue_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_queue *priv = nft_expr_priv(expr);
if (tb[NFTA_QUEUE_NUM] == NULL)
return -EINVAL;
init_hashrandom(&jhash_initval);
priv->queuenum = ntohs(nla_get_be16(tb[NFTA_QUEUE_NUM]));
if (tb[NFTA_QUEUE_TOTAL] != NULL)
priv->queues_total = ntohs(nla_get_be16(tb[NFTA_QUEUE_TOTAL]));
if (tb[NFTA_QUEUE_FLAGS] != NULL) {
priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS]));
if (priv->flags & ~NFT_QUEUE_FLAG_MASK)
return -EINVAL;
}
return 0;
}
static int nft_queue_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_queue *priv = nft_expr_priv(expr);
if (nla_put_be16(skb, NFTA_QUEUE_NUM, htons(priv->queuenum)) ||
nla_put_be16(skb, NFTA_QUEUE_TOTAL, htons(priv->queues_total)) ||
nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static struct nft_expr_type nft_queue_type;
static const struct nft_expr_ops nft_queue_ops = {
.type = &nft_queue_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_queue)),
.eval = nft_queue_eval,
.init = nft_queue_init,
.dump = nft_queue_dump,
};
static struct nft_expr_type nft_queue_type __read_mostly = {
.name = "queue",
.ops = &nft_queue_ops,
.policy = nft_queue_policy,
.maxattr = NFTA_QUEUE_MAX,
.owner = THIS_MODULE,
};
static int __init nft_queue_module_init(void)
{
return nft_register_expr(&nft_queue_type);
}
static void __exit nft_queue_module_exit(void)
{
nft_unregister_expr(&nft_queue_type);
}
module_init(nft_queue_module_init);
module_exit(nft_queue_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Eric Leblond <eric@regit.org>");
MODULE_ALIAS_NFT_EXPR("queue");
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