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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Handle firewalling core
* Linux ethernet bridge
*
* Authors:
* Lennert Buytenhek <buytenh@gnu.org>
* Bart De Schuymer <bdschuym@pandora.be>
*
* Lennert dedicates this file to Kerstin Wurdinger.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/in_route.h>
#include <linux/inetdevice.h>
#include <net/route.h>
#include "br_private.h"
#ifdef CONFIG_SYSCTL
#include <linux/sysctl.h>
#endif
static void fake_update_pmtu(struct dst_entry *dst, struct sock *sk,
struct sk_buff *skb, u32 mtu,
bool confirm_neigh)
{
}
static void fake_redirect(struct dst_entry *dst, struct sock *sk,
struct sk_buff *skb)
{
}
static u32 *fake_cow_metrics(struct dst_entry *dst, unsigned long old)
{
return NULL;
}
static struct neighbour *fake_neigh_lookup(const struct dst_entry *dst,
struct sk_buff *skb,
const void *daddr)
{
return NULL;
}
static unsigned int fake_mtu(const struct dst_entry *dst)
{
return dst->dev->mtu;
}
static struct dst_ops fake_dst_ops = {
.family = AF_INET,
.update_pmtu = fake_update_pmtu,
.redirect = fake_redirect,
.cow_metrics = fake_cow_metrics,
.neigh_lookup = fake_neigh_lookup,
.mtu = fake_mtu,
};
/*
* Initialize bogus route table used to keep netfilter happy.
* Currently, we fill in the PMTU entry because netfilter
* refragmentation needs it, and the rt_flags entry because
* ipt_REJECT needs it. Future netfilter modules might
* require us to fill additional fields.
*/
static const u32 br_dst_default_metrics[RTAX_MAX] = {
[RTAX_MTU - 1] = 1500,
};
void br_netfilter_rtable_init(struct net_bridge *br)
{
struct rtable *rt = &br->fake_rtable;
rcuref_init(&rt->dst.__rcuref, 1);
rt->dst.dev = br->dev;
dst_init_metrics(&rt->dst, br_dst_default_metrics, true);
rt->dst.flags = DST_NOXFRM | DST_FAKE_RTABLE;
rt->dst.ops = &fake_dst_ops;
}
int __init br_nf_core_init(void)
{
return dst_entries_init(&fake_dst_ops);
}
void br_nf_core_fini(void)
{
dst_entries_destroy(&fake_dst_ops);
}
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