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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: 308ac9143e ("netfilter: nf_conntrack: push zone object into functions")
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2015-09-03 01:26:07 +02:00 committed by David S. Miller
parent a82b0e6391
commit 62da98656b
5 changed files with 32 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/netfilter.h
View File

@ -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;

23
include/linux/netfilter/nf_conntrack_zones_common.h Normal file
View File

@ -0,0 +1,23 @@
#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 */

19
include/net/netfilter/nf_conntrack_zones.h
View File

@ -1,24 +1,7 @@
#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>

6
net/netfilter/core.c
View File

@ -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

7
net/netfilter/nf_conntrack_core.c
View File

@ -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),