return (ret != 0);
}
+/*
+ * Unfortunatly, _b and _mask are not aligned to an int (or long int)
+ * Some arches dont care, unrolling the loop is a win on them.
+ * For other arches, we only have a 16bit alignement.
+ */
+static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask)
+{
+#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
+ unsigned long ret = ifname_compare_aligned(_a, _b, _mask);
+#else
+ unsigned long ret = 0;
+ const u16 *a = (const u16 *)_a;
+ const u16 *b = (const u16 *)_b;
+ const u16 *mask = (const u16 *)_mask;
+ int i;
+
+ for (i = 0; i < IFNAMSIZ/sizeof(u16); i++)
+ ret |= (a[i] ^ b[i]) & mask[i];
+#endif
+ return ret;
+}
+
/* Returns whether packet matches rule or not. */
static inline int arp_packet_match(const struct arphdr *arphdr,
struct net_device *dev,
const char *arpptr = (char *)(arphdr + 1);
const char *src_devaddr, *tgt_devaddr;
__be32 src_ipaddr, tgt_ipaddr;
- int i, ret;
+ long ret;
#define FWINV(bool, invflg) ((bool) ^ !!(arpinfo->invflags & (invflg)))
}
/* Look for ifname matches. */
- for (i = 0, ret = 0; i < IFNAMSIZ; i++) {
- ret |= (indev[i] ^ arpinfo->iniface[i])
- & arpinfo->iniface_mask[i];
- }
+ ret = ifname_compare(indev, arpinfo->iniface, arpinfo->iniface_mask);
if (FWINV(ret != 0, ARPT_INV_VIA_IN)) {
dprintf("VIA in mismatch (%s vs %s).%s\n",
return 0;
}
- for (i = 0, ret = 0; i < IFNAMSIZ; i++) {
- ret |= (outdev[i] ^ arpinfo->outiface[i])
- & arpinfo->outiface_mask[i];
- }
+ ret = ifname_compare(outdev, arpinfo->outiface, arpinfo->outiface_mask);
if (FWINV(ret != 0, ARPT_INV_VIA_OUT)) {
dprintf("VIA out mismatch (%s vs %s).%s\n",
const struct net_device *out,
struct xt_table *table)
{
- static const char nulldevname[IFNAMSIZ];
+ static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
unsigned int verdict = NF_DROP;
const struct arphdr *arp;
bool hotdrop = false;
indev = in ? in->name : nulldevname;
outdev = out ? out->name : nulldevname;
- read_lock_bh(&table->lock);
- private = table->private;
- table_base = (void *)private->entries[smp_processor_id()];
+ rcu_read_lock();
+ private = rcu_dereference(table->private);
+ table_base = rcu_dereference(private->entries[smp_processor_id()]);
+
e = get_entry(table_base, private->hook_entry[hook]);
back = get_entry(table_base, private->underflow[hook]);
e = (void *)e + e->next_offset;
}
} while (!hotdrop);
- read_unlock_bh(&table->lock);
+
+ rcu_read_unlock();
if (hotdrop)
return NF_DROP;
&& unconditional(&e->arp)) || visited) {
unsigned int oldpos, size;
- if (t->verdict < -NF_MAX_VERDICT - 1) {
+ if ((strcmp(t->target.u.user.name,
+ ARPT_STANDARD_TARGET) == 0) &&
+ t->verdict < -NF_MAX_VERDICT - 1) {
duprintf("mark_source_chains: bad "
"negative verdict (%i)\n",
t->verdict);
}
}
-static inline struct xt_counters *alloc_counters(struct xt_table *table)
+
+/* We're lazy, and add to the first CPU; overflow works its fey magic
+ * and everything is OK. */
+static int
+add_counter_to_entry(struct arpt_entry *e,
+ const struct xt_counters addme[],
+ unsigned int *i)
+{
+ ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt);
+
+ (*i)++;
+ return 0;
+}
+
+/* Take values from counters and add them back onto the current cpu */
+static void put_counters(struct xt_table_info *t,
+ const struct xt_counters counters[])
+{
+ unsigned int i, cpu;
+
+ local_bh_disable();
+ cpu = smp_processor_id();
+ i = 0;
+ ARPT_ENTRY_ITERATE(t->entries[cpu],
+ t->size,
+ add_counter_to_entry,
+ counters,
+ &i);
+ local_bh_enable();
+}
+
+static inline int
+zero_entry_counter(struct arpt_entry *e, void *arg)
+{
+ e->counters.bcnt = 0;
+ e->counters.pcnt = 0;
+ return 0;
+}
+
+static void
+clone_counters(struct xt_table_info *newinfo, const struct xt_table_info *info)
+{
+ unsigned int cpu;
+ const void *loc_cpu_entry = info->entries[raw_smp_processor_id()];
+
+ memcpy(newinfo, info, offsetof(struct xt_table_info, entries));
+ for_each_possible_cpu(cpu) {
+ memcpy(newinfo->entries[cpu], loc_cpu_entry, info->size);
+ ARPT_ENTRY_ITERATE(newinfo->entries[cpu], newinfo->size,
+ zero_entry_counter, NULL);
+ }
+}
+
+static struct xt_counters *alloc_counters(struct xt_table *table)
{
unsigned int countersize;
struct xt_counters *counters;
- const struct xt_table_info *private = table->private;
+ struct xt_table_info *private = table->private;
+ struct xt_table_info *info;
/* We need atomic snapshot of counters: rest doesn't change
* (other than comefrom, which userspace doesn't care
counters = vmalloc_node(countersize, numa_node_id());
if (counters == NULL)
- return ERR_PTR(-ENOMEM);
+ goto nomem;
+
+ info = xt_alloc_table_info(private->size);
+ if (!info)
+ goto free_counters;
+
+ clone_counters(info, private);
+
+ mutex_lock(&table->lock);
+ xt_table_entry_swap_rcu(private, info);
+ synchronize_net(); /* Wait until smoke has cleared */
+
+ get_counters(info, counters);
+ put_counters(private, counters);
+ mutex_unlock(&table->lock);
- /* First, sum counters... */
- write_lock_bh(&table->lock);
- get_counters(private, counters);
- write_unlock_bh(&table->lock);
+ xt_free_table_info(info);
return counters;
+
+ free_counters:
+ vfree(counters);
+ nomem:
+ return ERR_PTR(-ENOMEM);
}
static int copy_entries_to_user(unsigned int total_size,
return ret;
}
-/* We're lazy, and add to the first CPU; overflow works its fey magic
- * and everything is OK.
- */
-static inline int add_counter_to_entry(struct arpt_entry *e,
- const struct xt_counters addme[],
- unsigned int *i)
-{
-
- ADD_COUNTER(e->counters, addme[*i].bcnt, addme[*i].pcnt);
-
- (*i)++;
- return 0;
-}
-
static int do_add_counters(struct net *net, void __user *user, unsigned int len,
int compat)
{
goto free;
}
- write_lock_bh(&t->lock);
+ mutex_lock(&t->lock);
private = t->private;
if (private->number != num_counters) {
ret = -EINVAL;
goto unlock_up_free;
}
+ preempt_disable();
i = 0;
/* Choose the copy that is on our node */
loc_cpu_entry = private->entries[smp_processor_id()];
add_counter_to_entry,
paddc,
&i);
+ preempt_enable();
unlock_up_free:
- write_unlock_bh(&t->lock);
+ mutex_unlock(&t->lock);
+
xt_table_unlock(t);
module_put(t->me);
free:
projects / linux-2.6-omap-h63xx.git / blobdiff