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path: root/net/ipv6/netfilter/ip6_tables.c
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Diffstat (limited to 'net/ipv6/netfilter/ip6_tables.c')
-rw-r--r--net/ipv6/netfilter/ip6_tables.c45
1 files changed, 14 insertions, 31 deletions
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 455582384ece..7d227c644f72 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -897,42 +897,25 @@ get_counters(const struct xt_table_info *t,
struct ip6t_entry *iter;
unsigned int cpu;
unsigned int i;
- unsigned int curcpu = get_cpu();
-
- /* Instead of clearing (by a previous call to memset())
- * the counters and using adds, we set the counters
- * with data used by 'current' CPU
- *
- * Bottom half has to be disabled to prevent deadlock
- * if new softirq were to run and call ipt_do_table
- */
- local_bh_disable();
- i = 0;
- xt_entry_foreach(iter, t->entries[curcpu], t->size) {
- SET_COUNTER(counters[i], iter->counters.bcnt,
- iter->counters.pcnt);
- ++i;
- }
- local_bh_enable();
- /* Processing counters from other cpus, we can let bottom half enabled,
- * (preemption is disabled)
- */
for_each_possible_cpu(cpu) {
- if (cpu == curcpu)
- continue;
+ seqlock_t *lock = &per_cpu(xt_info_locks, cpu).lock;
+
i = 0;
- local_bh_disable();
- xt_info_wrlock(cpu);
xt_entry_foreach(iter, t->entries[cpu], t->size) {
- ADD_COUNTER(counters[i], iter->counters.bcnt,
- iter->counters.pcnt);
+ u64 bcnt, pcnt;
+ unsigned int start;
+
+ do {
+ start = read_seqbegin(lock);
+ bcnt = iter->counters.bcnt;
+ pcnt = iter->counters.pcnt;
+ } while (read_seqretry(lock, start));
+
+ ADD_COUNTER(counters[i], bcnt, pcnt);
++i;
}
- xt_info_wrunlock(cpu);
- local_bh_enable();
}
- put_cpu();
}
static struct xt_counters *alloc_counters(const struct xt_table *table)
@@ -945,7 +928,7 @@ static struct xt_counters *alloc_counters(const struct xt_table *table)
(other than comefrom, which userspace doesn't care
about). */
countersize = sizeof(struct xt_counters) * private->number;
- counters = vmalloc(countersize);
+ counters = vzalloc(countersize);
if (counters == NULL)
return ERR_PTR(-ENOMEM);
@@ -1216,7 +1199,7 @@ __do_replace(struct net *net, const char *name, unsigned int valid_hooks,
struct ip6t_entry *iter;
ret = 0;
- counters = vmalloc(num_counters * sizeof(struct xt_counters));
+ counters = vzalloc(num_counters * sizeof(struct xt_counters));
if (!counters) {
ret = -ENOMEM;
goto out;