cregit-Linux how code gets into the kernel

Release 4.11 net/bridge/br_nf_core.c

Directory: net/bridge
/*
 *      Handle firewalling core
 *      Linux ethernet bridge
 *
 *      Authors:
 *      Lennert Buytenhek               <buytenh@gnu.org>
 *      Bart De Schuymer                <bdschuym@pandora.be>
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 *
 *      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) { }

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static void fake_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) { }

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static u32 *fake_cow_metrics(struct dst_entry *dst, unsigned long old) { return NULL; }

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static struct neighbour *fake_neigh_lookup(const struct dst_entry *dst, struct sk_buff *skb, const void *daddr) { return NULL; }

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static unsigned int fake_mtu(const struct dst_entry *dst) { return dst->dev->mtu; }

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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; atomic_set(&rt->dst.__refcnt, 1); rt->dst.dev = br->dev; rt->dst.path = &rt->dst; dst_init_metrics(&rt->dst, br_dst_default_metrics, true); rt->dst.flags = DST_NOXFRM | DST_FAKE_RTABLE; rt->dst.ops = &fake_dst_ops; }

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int __init br_nf_core_init(void) { return dst_entries_init(&fake_dst_ops); }

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void br_nf_core_fini(void) { dst_entries_destroy(&fake_dst_ops); }

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Directory: net/bridge
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