cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

br_nf_core.c (2053B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *	Handle firewalling core
      4 *	Linux ethernet bridge
      5 *
      6 *	Authors:
      7 *	Lennert Buytenhek		<buytenh@gnu.org>
      8 *	Bart De Schuymer		<bdschuym@pandora.be>
      9 *
     10 *	Lennert dedicates this file to Kerstin Wurdinger.
     11 */
     12
     13#include <linux/module.h>
     14#include <linux/kernel.h>
     15#include <linux/in_route.h>
     16#include <linux/inetdevice.h>
     17#include <net/route.h>
     18
     19#include "br_private.h"
     20#ifdef CONFIG_SYSCTL
     21#include <linux/sysctl.h>
     22#endif
     23
     24static void fake_update_pmtu(struct dst_entry *dst, struct sock *sk,
     25			     struct sk_buff *skb, u32 mtu,
     26			     bool confirm_neigh)
     27{
     28}
     29
     30static void fake_redirect(struct dst_entry *dst, struct sock *sk,
     31			  struct sk_buff *skb)
     32{
     33}
     34
     35static u32 *fake_cow_metrics(struct dst_entry *dst, unsigned long old)
     36{
     37	return NULL;
     38}
     39
     40static struct neighbour *fake_neigh_lookup(const struct dst_entry *dst,
     41					   struct sk_buff *skb,
     42					   const void *daddr)
     43{
     44	return NULL;
     45}
     46
     47static unsigned int fake_mtu(const struct dst_entry *dst)
     48{
     49	return dst->dev->mtu;
     50}
     51
     52static struct dst_ops fake_dst_ops = {
     53	.family		= AF_INET,
     54	.update_pmtu	= fake_update_pmtu,
     55	.redirect	= fake_redirect,
     56	.cow_metrics	= fake_cow_metrics,
     57	.neigh_lookup	= fake_neigh_lookup,
     58	.mtu		= fake_mtu,
     59};
     60
     61/*
     62 * Initialize bogus route table used to keep netfilter happy.
     63 * Currently, we fill in the PMTU entry because netfilter
     64 * refragmentation needs it, and the rt_flags entry because
     65 * ipt_REJECT needs it.  Future netfilter modules might
     66 * require us to fill additional fields.
     67 */
     68static const u32 br_dst_default_metrics[RTAX_MAX] = {
     69	[RTAX_MTU - 1] = 1500,
     70};
     71
     72void br_netfilter_rtable_init(struct net_bridge *br)
     73{
     74	struct rtable *rt = &br->fake_rtable;
     75
     76	atomic_set(&rt->dst.__refcnt, 1);
     77	rt->dst.dev = br->dev;
     78	dst_init_metrics(&rt->dst, br_dst_default_metrics, true);
     79	rt->dst.flags	= DST_NOXFRM | DST_FAKE_RTABLE;
     80	rt->dst.ops = &fake_dst_ops;
     81}
     82
     83int __init br_nf_core_init(void)
     84{
     85	return dst_entries_init(&fake_dst_ops);
     86}
     87
     88void br_nf_core_fini(void)
     89{
     90	dst_entries_destroy(&fake_dst_ops);
     91}