netfilter: nf_tables: add packet duplication to the netdev family

You can use this to duplicate packets and inject them at the egress path
of the specified interface. This duplication allows you to inspect
traffic from the dummy or any other interface dedicated to this purpose.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2016-01-03 21:02:18 +01:00
parent c7862a5f0d
commit 502061f81d
5 changed files with 165 additions and 0 deletions

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@ -0,0 +1,6 @@
#ifndef _NF_DUP_NETDEV_H_
#define _NF_DUP_NETDEV_H_
void nf_dup_netdev_egress(const struct nft_pktinfo *pkt, int oif);
#endif

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@ -563,6 +563,22 @@ config NFT_COMPAT
x_tables match/target extensions over the nf_tables
framework.
if NF_TABLES_NETDEV
config NF_DUP_NETDEV
tristate "Netfilter packet duplication support"
help
This option enables the generic packet duplication infrastructure
for Netfilter.
config NFT_DUP_NETDEV
tristate "Netfilter nf_tables netdev packet duplication support"
select NF_DUP_NETDEV
help
This option enables packet duplication for the "netdev" family.
endif # NF_TABLES_NETDEV
endif # NF_TABLES
config NETFILTER_XTABLES

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@ -66,6 +66,9 @@ obj-$(CONFIG_NF_NAT_TFTP) += nf_nat_tftp.o
# SYNPROXY
obj-$(CONFIG_NETFILTER_SYNPROXY) += nf_synproxy_core.o
# generic packet duplication from netdev family
obj-$(CONFIG_NF_DUP_NETDEV) += nf_dup_netdev.o
# nf_tables
nf_tables-objs += nf_tables_core.o nf_tables_api.o nf_tables_trace.o
nf_tables-objs += nft_immediate.o nft_cmp.o nft_lookup.o nft_dynset.o
@ -90,6 +93,9 @@ obj-$(CONFIG_NFT_LOG) += nft_log.o
obj-$(CONFIG_NFT_MASQ) += nft_masq.o
obj-$(CONFIG_NFT_REDIR) += nft_redir.o
# nf_tables netdev
obj-$(CONFIG_NFT_DUP_NETDEV) += nft_dup_netdev.o
# generic X tables
obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o

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@ -0,0 +1,40 @@
/*
* Copyright (c) 2015 Pablo Neira Ayuso <pablo@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/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
void nf_dup_netdev_egress(const struct nft_pktinfo *pkt, int oif)
{
struct net_device *dev;
struct sk_buff *skb;
dev = dev_get_by_index_rcu(pkt->net, oif);
if (dev == NULL)
return;
skb = skb_clone(pkt->skb, GFP_ATOMIC);
if (skb == NULL)
return;
if (skb_mac_header_was_set(skb))
skb_push(skb, skb->mac_len);
skb->dev = dev;
skb_sender_cpu_clear(skb);
dev_queue_xmit(skb);
}
EXPORT_SYMBOL_GPL(nf_dup_netdev_egress);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");

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@ -0,0 +1,97 @@
/*
* Copyright (c) 2015 Pablo Neira Ayuso <pablo@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/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_dup_netdev.h>
struct nft_dup_netdev {
enum nft_registers sreg_dev:8;
};
static void nft_dup_netdev_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
struct nft_dup_netdev *priv = nft_expr_priv(expr);
int oif = regs->data[priv->sreg_dev];
nf_dup_netdev_egress(pkt, oif);
}
static const struct nla_policy nft_dup_netdev_policy[NFTA_DUP_MAX + 1] = {
[NFTA_DUP_SREG_DEV] = { .type = NLA_U32 },
};
static int nft_dup_netdev_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_dup_netdev *priv = nft_expr_priv(expr);
if (tb[NFTA_DUP_SREG_DEV] == NULL)
return -EINVAL;
priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
return nft_validate_register_load(priv->sreg_dev, sizeof(int));
}
static const struct nft_expr_ops nft_dup_netdev_ingress_ops;
static int nft_dup_netdev_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
struct nft_dup_netdev *priv = nft_expr_priv(expr);
if (nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static struct nft_expr_type nft_dup_netdev_type;
static const struct nft_expr_ops nft_dup_netdev_ops = {
.type = &nft_dup_netdev_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_dup_netdev)),
.eval = nft_dup_netdev_eval,
.init = nft_dup_netdev_init,
.dump = nft_dup_netdev_dump,
};
static struct nft_expr_type nft_dup_netdev_type __read_mostly = {
.family = NFPROTO_NETDEV,
.name = "dup",
.ops = &nft_dup_netdev_ops,
.policy = nft_dup_netdev_policy,
.maxattr = NFTA_DUP_MAX,
.owner = THIS_MODULE,
};
static int __init nft_dup_netdev_module_init(void)
{
return nft_register_expr(&nft_dup_netdev_type);
}
static void __exit nft_dup_netdev_module_exit(void)
{
nft_unregister_expr(&nft_dup_netdev_type);
}
module_init(nft_dup_netdev_module_init);
module_exit(nft_dup_netdev_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
MODULE_ALIAS_NFT_AF_EXPR(5, "dup");