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netfilter: nf_tables: add fib expression to the netdev family 

Add fib expression support for netdev family. Like inet family, netdev
delegates the actual decision to the corresponding backend, either ipv4
or ipv6.

This allows to perform very early reverse path filtering, among other
things.

You can find more information about fib expression in the f6d0cbcf09
("<netfilter: nf_tables: add fib expression>") commit message.

Signed-off-by: Pablo M. Bermudo Garay <pablombg@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo M. Bermudo Garay 2017-07-21 01:54:38 +02:00 committed by Pablo Neira Ayuso
parent f347ec852c
commit 6392c22603
3 changed files with 97 additions and 0 deletions
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9
net/netfilter/Kconfig
View File

@ -636,6 +636,15 @@ config NFT_FWD_NETDEV
help
This option enables packet forwarding for the "netdev" family.
config NFT_FIB_NETDEV
depends on NFT_FIB_IPV4
depends on NFT_FIB_IPV6
tristate "Netfilter nf_tables netdev fib lookups support"
help
This option allows using the FIB expression from the netdev table.
The lookup will be delegated to the IPv4 or IPv6 FIB depending
on the protocol of the packet.
endif # NF_TABLES_NETDEV
endif # NF_TABLES

1
net/netfilter/Makefile
View File

@ -100,6 +100,7 @@ obj-$(CONFIG_NFT_REDIR) += nft_redir.o
obj-$(CONFIG_NFT_HASH) += nft_hash.o
obj-$(CONFIG_NFT_FIB) += nft_fib.o
obj-$(CONFIG_NFT_FIB_INET) += nft_fib_inet.o
obj-$(CONFIG_NFT_FIB_NETDEV) += nft_fib_netdev.o
# nf_tables netdev
obj-$(CONFIG_NFT_DUP_NETDEV) += nft_dup_netdev.o

87
net/netfilter/nft_fib_netdev.c Normal file
View File

@ -0,0 +1,87 @@
/*
* Copyright (c) 2017 Pablo M. Bermudo Garay <pablombg@gmail.com>
*
* 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.
*
* This code is based on net/netfilter/nft_fib_inet.c, written by
* Florian Westphal <fw@strlen.de>.
*/
#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_core.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nft_fib.h>
static void nft_fib_netdev_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
const struct nft_fib *priv = nft_expr_priv(expr);
switch (ntohs(pkt->skb->protocol)) {
case ETH_P_IP:
switch (priv->result) {
case NFT_FIB_RESULT_OIF:
case NFT_FIB_RESULT_OIFNAME:
return nft_fib4_eval(expr, regs, pkt);
case NFT_FIB_RESULT_ADDRTYPE:
return nft_fib4_eval_type(expr, regs, pkt);
}
break;
case ETH_P_IPV6:
switch (priv->result) {
case NFT_FIB_RESULT_OIF:
case NFT_FIB_RESULT_OIFNAME:
return nft_fib6_eval(expr, regs, pkt);
case NFT_FIB_RESULT_ADDRTYPE:
return nft_fib6_eval_type(expr, regs, pkt);
}
break;
}
regs->verdict.code = NFT_BREAK;
}
static struct nft_expr_type nft_fib_netdev_type;
static const struct nft_expr_ops nft_fib_netdev_ops = {
.type = &nft_fib_netdev_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
.eval = nft_fib_netdev_eval,
.init = nft_fib_init,
.dump = nft_fib_dump,
.validate = nft_fib_validate,
};
static struct nft_expr_type nft_fib_netdev_type __read_mostly = {
.family = NFPROTO_NETDEV,
.name = "fib",
.ops = &nft_fib_netdev_ops,
.policy = nft_fib_policy,
.maxattr = NFTA_FIB_MAX,
.owner = THIS_MODULE,
};
static int __init nft_fib_netdev_module_init(void)
{
return nft_register_expr(&nft_fib_netdev_type);
}
static void __exit nft_fib_netdev_module_exit(void)
{
nft_unregister_expr(&nft_fib_netdev_type);
}
module_init(nft_fib_netdev_module_init);
module_exit(nft_fib_netdev_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pablo M. Bermudo Garay <pablombg@gmail.com>");
MODULE_ALIAS_NFT_AF_EXPR(5, "fib");