netfilter: x_tables: pass xt_counters struct instead of packet counter

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>

diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h
index cd4eaf8..6e61ede 100644 (file)
--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -430,11 +430,7 @@ 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 848a070..019f8e8 100644 (file)
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -439,7 +439,7 @@ 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;
 }
@@ -519,7 +519,7 @@ 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 46815c8..acc9a0c 100644 (file)
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -582,7 +582,7 @@ 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;
 }
@@ -670,7 +670,7 @@ 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 6ff42b8..88b56a9 100644 (file)
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -612,7 +612,7 @@ 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;
 }
@@ -699,8 +699,7 @@ 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 ad818e5..0580029 100644 (file)
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -1615,6 +1615,15 @@ 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;