4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Florian Westphal <fw@xxxxxxxxx>
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@xxxxxxxxx>
Acked-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/linux/netfilter/x_tables.h | 6 +-----
net/ipv4/netfilter/arp_tables.c | 4 ++--
net/ipv4/netfilter/ip_tables.c | 4 ++--
net/ipv6/netfilter/ip6_tables.c | 5 ++---
net/netfilter/x_tables.c | 9 +++++++++
5 files changed, 16 insertions(+), 12 deletions(-)
--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -395,11 +395,7 @@ static inline unsigned long xt_percpu_co
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)
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -540,7 +540,7 @@ find_check_entry(struct arpt_entry *e, c
err:
module_put(t->u.kernel.target->me);
out:
- xt_percpu_counter_free(e->counters.pcnt);
+ xt_percpu_counter_free(&e->counters);
return ret;
}
@@ -628,7 +628,7 @@ static inline void cleanup_entry(struct
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
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -701,7 +701,7 @@ find_check_entry(struct ipt_entry *e, st
cleanup_match(ematch, net);
}
- xt_percpu_counter_free(e->counters.pcnt);
+ xt_percpu_counter_free(&e->counters);
return ret;
}
@@ -797,7 +797,7 @@ cleanup_entry(struct ipt_entry *e, struc
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
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -713,7 +713,7 @@ find_check_entry(struct ip6t_entry *e, s
cleanup_match(ematch, net);
}
- xt_percpu_counter_free(e->counters.pcnt);
+ xt_percpu_counter_free(&e->counters);
return ret;
}
@@ -808,8 +808,7 @@ static void cleanup_entry(struct ip6t_en
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
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -1592,6 +1592,15 @@ void xt_proto_fini(struct net *net, u_in
}
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;