netfilter: x_tables: pass xt_counters struct instead of packet counter

commit 4d31eef5176df06f218201bc9c0ce40babb41660 upstream.

On SMP we overload the packet counter (unsigned long) to contain
percpu offset.  Hide this from callers and pass xt_counters address
instead.

Preparation patch to allocate the percpu counters in page-sized batch
chunks.

Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h
index 2ad1a2b..dfd56c1 100644 (file)
--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -402,11 +402,7 @@ static inline unsigned long xt_percpu_counter_alloc(void)
 
        return 0;
 }
-static inline void xt_percpu_counter_free(u64 pcnt)
-{
-       if (nr_cpu_ids > 1)
-               free_percpu((void __percpu *) (unsigned long) pcnt);
-}
+void xt_percpu_counter_free(struct xt_counters *cnt);
 
 static inline struct xt_counters *
 xt_get_this_cpu_counter(struct xt_counters *cnt)

diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index ad1c49e..bfdd29a 100644 (file)
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -447,7 +447,7 @@ find_check_entry(struct arpt_entry *e, const char *name, unsigned int size)
 err:
        module_put(t->u.kernel.target->me);
 out:
-       xt_percpu_counter_free(e->counters.pcnt);
+       xt_percpu_counter_free(&e->counters);
 
        return ret;
 }
@@ -527,7 +527,7 @@ static inline void cleanup_entry(struct arpt_entry *e)
        if (par.target->destroy != NULL)
                par.target->destroy(&par);
        module_put(par.target->me);
-       xt_percpu_counter_free(e->counters.pcnt);
+       xt_percpu_counter_free(&e->counters);
 }
 
 /* Checks and translates the user-supplied table segment (held in

diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index a3c5433..1cf5070 100644 (file)
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -591,7 +591,7 @@ find_check_entry(struct ipt_entry *e, struct net *net, const char *name,
                cleanup_match(ematch, net);
        }
 
-       xt_percpu_counter_free(e->counters.pcnt);
+       xt_percpu_counter_free(&e->counters);
 
        return ret;
 }
@@ -679,7 +679,7 @@ cleanup_entry(struct ipt_entry *e, struct net *net)
        if (par.target->destroy != NULL)
                par.target->destroy(&par);
        module_put(par.target->me);
-       xt_percpu_counter_free(e->counters.pcnt);
+       xt_percpu_counter_free(&e->counters);
 }
 
 /* Checks and translates the user-supplied table segment (held in

diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 3d95b07..3117c17 100644 (file)
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -620,7 +620,7 @@ find_check_entry(struct ip6t_entry *e, struct net *net, const char *name,
                cleanup_match(ematch, net);
        }
 
-       xt_percpu_counter_free(e->counters.pcnt);
+       xt_percpu_counter_free(&e->counters);
 
        return ret;
 }
@@ -707,8 +707,7 @@ static void cleanup_entry(struct ip6t_entry *e, struct net *net)
        if (par.target->destroy != NULL)
                par.target->destroy(&par);
        module_put(par.target->me);
-
-       xt_percpu_counter_free(e->counters.pcnt);
+       xt_percpu_counter_free(&e->counters);
 }
 
 /* Checks and translates the user-supplied table segment (held in

diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index e47ade3..4ef619d 100644 (file)
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -1619,6 +1619,15 @@ void xt_proto_fini(struct net *net, u_int8_t af)
 }
 EXPORT_SYMBOL_GPL(xt_proto_fini);
 
+void xt_percpu_counter_free(struct xt_counters *counters)
+{
+       unsigned long pcnt = counters->pcnt;
+
+       if (nr_cpu_ids > 1)
+               free_percpu((void __percpu *)pcnt);
+}
+EXPORT_SYMBOL_GPL(xt_percpu_counter_free);
+
 static int __net_init xt_net_init(struct net *net)
 {
        int i;