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Commit 62da9865 authored by Daniel Borkmann's avatar Daniel Borkmann Committed by David S. Miller
Browse files

netfilter: nf_conntrack: make nf_ct_zone_dflt built-in 



Fengguang reported, that some randconfig generated the following linker
issue with nf_ct_zone_dflt object involved:

  [...]
  CC      init/version.o
  LD      init/built-in.o
  net/built-in.o: In function `ipv4_conntrack_defrag':
  nf_defrag_ipv4.c:(.text+0x93e95): undefined reference to `nf_ct_zone_dflt'
  net/built-in.o: In function `ipv6_defrag':
  nf_defrag_ipv6_hooks.c:(.text+0xe3ffe): undefined reference to `nf_ct_zone_dflt'
  make: *** [vmlinux] Error 1

Given that configurations exist where we have a built-in part, which is
accessing nf_ct_zone_dflt such as the two handlers nf_ct_defrag_user()
and nf_ct6_defrag_user(), and a part that configures nf_conntrack as a
module, we must move nf_ct_zone_dflt into a fixed, guaranteed built-in
area when netfilter is configured in general.

Therefore, split the more generic parts into a common header under
include/linux/netfilter/ and move nf_ct_zone_dflt into the built-in
section that already holds parts related to CONFIG_NF_CONNTRACK in the
netfilter core. This fixes the issue on my side.

Fixes: 308ac914 ("netfilter: nf_conntrack: push zone object into functions")
Reported-by: default avatarFengguang Wu <fengguang.wu@intel.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a82b0e63

include/linux/netfilter.h

+2 −0
Original line number Diff line number Diff line
@@ -368,6 +368,8 @@ nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) 
#endif /*CONFIG_NETFILTER*/



#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)

#include <linux/netfilter/nf_conntrack_zones_common.h>



extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu;

void nf_ct_attach(struct sk_buff *, const struct sk_buff *);

extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu;

include/linux/netfilter/nf_conntrack_zones_common.h

0 → 100644
+23 −0
Original line number Diff line number Diff line 
#ifndef _NF_CONNTRACK_ZONES_COMMON_H

#define _NF_CONNTRACK_ZONES_COMMON_H



#include <uapi/linux/netfilter/nf_conntrack_tuple_common.h>



#define NF_CT_DEFAULT_ZONE_ID	0



#define NF_CT_ZONE_DIR_ORIG	(1 << IP_CT_DIR_ORIGINAL)

#define NF_CT_ZONE_DIR_REPL	(1 << IP_CT_DIR_REPLY)



#define NF_CT_DEFAULT_ZONE_DIR	(NF_CT_ZONE_DIR_ORIG | NF_CT_ZONE_DIR_REPL)



#define NF_CT_FLAG_MARK		1



struct nf_conntrack_zone {

	u16	id;

	u8	flags;

	u8	dir;

};



extern const struct nf_conntrack_zone nf_ct_zone_dflt;



#endif /* _NF_CONNTRACK_ZONES_COMMON_H */

include/net/netfilter/nf_conntrack_zones.h

+1 −18
Original line number Diff line number Diff line 
#ifndef _NF_CONNTRACK_ZONES_H

#define _NF_CONNTRACK_ZONES_H



#include <linux/netfilter/nf_conntrack_tuple_common.h>



#define NF_CT_DEFAULT_ZONE_ID	0



#define NF_CT_ZONE_DIR_ORIG	(1 << IP_CT_DIR_ORIGINAL)

#define NF_CT_ZONE_DIR_REPL	(1 << IP_CT_DIR_REPLY)



#define NF_CT_DEFAULT_ZONE_DIR	(NF_CT_ZONE_DIR_ORIG | NF_CT_ZONE_DIR_REPL)



#define NF_CT_FLAG_MARK		1



struct nf_conntrack_zone {

	u16	id;

	u8	flags;

	u8	dir;

};



extern const struct nf_conntrack_zone nf_ct_zone_dflt;

#include <linux/netfilter/nf_conntrack_zones_common.h>



#if IS_ENABLED(CONFIG_NF_CONNTRACK)

#include <net/netfilter/nf_conntrack_extend.h>

net/netfilter/core.c

+6 −0
Original line number Diff line number Diff line
@@ -388,6 +388,12 @@ EXPORT_SYMBOL(nf_conntrack_destroy); 
struct nfq_ct_hook __rcu *nfq_ct_hook __read_mostly;

EXPORT_SYMBOL_GPL(nfq_ct_hook);



/* Built-in default zone used e.g. by modules. */

const struct nf_conntrack_zone nf_ct_zone_dflt = {

	.id	= NF_CT_DEFAULT_ZONE_ID,

	.dir	= NF_CT_DEFAULT_ZONE_DIR,

};

EXPORT_SYMBOL_GPL(nf_ct_zone_dflt);

#endif /* CONFIG_NF_CONNTRACK */



#ifdef CONFIG_NF_NAT_NEEDED

net/netfilter/nf_conntrack_core.c

+0 −7
Original line number Diff line number Diff line
@@ -1286,13 +1286,6 @@ bool __nf_ct_kill_acct(struct nf_conn *ct, 
}

EXPORT_SYMBOL_GPL(__nf_ct_kill_acct);



/* Built-in default zone used e.g. by modules. */

const struct nf_conntrack_zone nf_ct_zone_dflt = {

	.id	= NF_CT_DEFAULT_ZONE_ID,

	.dir	= NF_CT_DEFAULT_ZONE_DIR,

};

EXPORT_SYMBOL_GPL(nf_ct_zone_dflt);



#ifdef CONFIG_NF_CONNTRACK_ZONES

static struct nf_ct_ext_type nf_ct_zone_extend __read_mostly = {

	.len	= sizeof(struct nf_conntrack_zone),