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netfilter: nfnetlink_queue: fix compilation with CONFIG_NF_NAT=m and CONFIG_NF_CT_NETLINK=y

Browse source 
LD      init/built-in.o
net/built-in.o:(.data+0x4408): undefined reference to `nf_nat_tcp_seq_adjust'
make: *** [vmlinux] Error 1

This patch adds a new pointer hook (nfq_ct_nat_hook) similar to other existing
in Netfilter to solve our complicated configuration dependencies.

Reported-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2012-06-20 20:52:31 +02:00
parent 5a05fae5ca
commit d584a61a93
5 changed files with 18 additions and 8 deletions
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6
include/linux/netfilter.h
View file

@ -401,10 +401,14 @@ struct nfq_ct_hook {
size_t (*build_size)(const struct nf_conn *ct);
int (*build)(struct sk_buff *skb, struct nf_conn *ct);
int (*parse)(const struct nlattr *attr, struct nf_conn *ct);
};
extern struct nfq_ct_hook __rcu *nfq_ct_hook;
struct nfq_ct_nat_hook {
void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct,
u32 ctinfo, int off);
};
extern struct nfq_ct_hook __rcu *nfq_ct_hook;
extern struct nfq_ct_nat_hook __rcu *nfq_ct_nat_hook;
#else
static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
#endif

6
net/ipv4/netfilter/nf_nat_core.c
View file

@ -691,6 +691,10 @@ static struct nf_ct_helper_expectfn follow_master_nat = {
.expectfn = nf_nat_follow_master,
};
static struct nfq_ct_nat_hook nfq_ct_nat = {
.seq_adjust = nf_nat_tcp_seq_adjust,
};
static int __init nf_nat_init(void)
{
size_t i;
@ -731,6 +735,7 @@ static int __init nf_nat_init(void)
nfnetlink_parse_nat_setup);
BUG_ON(nf_ct_nat_offset != NULL);
RCU_INIT_POINTER(nf_ct_nat_offset, nf_nat_get_offset);
RCU_INIT_POINTER(nfq_ct_nat_hook, &nfq_ct_nat);
return 0;
cleanup_extend:
@ -747,6 +752,7 @@ static void __exit nf_nat_cleanup(void)
RCU_INIT_POINTER(nf_nat_seq_adjust_hook, NULL);
RCU_INIT_POINTER(nfnetlink_parse_nat_setup_hook, NULL);
RCU_INIT_POINTER(nf_ct_nat_offset, NULL);
RCU_INIT_POINTER(nfq_ct_nat_hook, NULL);
synchronize_net();
}

3
net/netfilter/core.c
View file

@ -268,6 +268,9 @@ EXPORT_SYMBOL(nf_conntrack_destroy);
struct nfq_ct_hook __rcu *nfq_ct_hook __read_mostly;
EXPORT_SYMBOL_GPL(nfq_ct_hook);
struct nfq_ct_nat_hook __rcu *nfq_ct_nat_hook __read_mostly;
EXPORT_SYMBOL_GPL(nfq_ct_nat_hook);
#endif /* CONFIG_NF_CONNTRACK */
#ifdef CONFIG_PROC_FS

3
net/netfilter/nf_conntrack_netlink.c
View file

@ -1757,9 +1757,6 @@ static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
.build_size = ctnetlink_nfqueue_build_size,
.build = ctnetlink_nfqueue_build,
.parse = ctnetlink_nfqueue_parse,
#ifdef CONFIG_NF_NAT_NEEDED
.seq_adjust = nf_nat_tcp_seq_adjust,
#endif
};
#endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */

8
net/netfilter/nfnetlink_queue_ct.c
View file

@ -86,12 +86,12 @@ int nfqnl_ct_put(struct sk_buff *skb, struct nf_conn *ct,
void nfqnl_ct_seq_adjust(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo, int diff)
{
struct nfq_ct_hook *nfq_ct;
struct nfq_ct_nat_hook *nfq_nat_ct;
nfq_ct = rcu_dereference(nfq_ct_hook);
if (nfq_ct == NULL)
nfq_nat_ct = rcu_dereference(nfq_ct_nat_hook);
if (nfq_nat_ct == NULL)
return;
if ((ct->status & IPS_NAT_MASK) && diff)
nfq_ct->seq_adjust(skb, ct, ctinfo, diff);
nfq_nat_ct->seq_adjust(skb, ct, ctinfo, diff);
}