netfilter: xtables: consolidate comefrom debug cast access

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

1 files changed, 8 insertions, 5 deletions

diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 5a178be6c8cc..5164e0bf3bcc 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -343,6 +343,8 @@ ip6t_do_table(struct sk_buff *skb,
               const struct net_device *out,
               struct xt_table *table)
 {
+#define tb_comefrom ((struct ip6t_entry *)table_base)->comefrom
+
         static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
         bool hotdrop = false;
         /* Initializing verdict to NF_DROP keeps gcc happy. */
@@ -440,18 +442,17 @@ ip6t_do_table(struct sk_buff *skb,
                 tgpar.targinfo = t->data;
 
 #ifdef CONFIG_NETFILTER_DEBUG
-                ((struct ip6t_entry *)table_base)->comefrom = 0xeeeeeeec;
+                tb_comefrom = 0xeeeeeeec;
 #endif
                 verdict = t->u.kernel.target->target(skb, &tgpar);
 
 #ifdef CONFIG_NETFILTER_DEBUG
-                if (((struct ip6t_entry *)table_base)->comefrom != 0xeeeeeeec &&
-                    verdict == IP6T_CONTINUE) {
+                if (tb_comefrom != 0xeeeeeeec && verdict == IP6T_CONTINUE) {
                         printk("Target %s reentered!\n",
                                t->u.kernel.target->name);
                         verdict = NF_DROP;
                 }
-                ((struct ip6t_entry *)table_base)->comefrom = 0x57acc001;
+                tb_comefrom = 0x57acc001;
 #endif
                 if (verdict == IP6T_CONTINUE)
                         e = ip6t_next_entry(e);
@@ -461,7 +462,7 @@ ip6t_do_table(struct sk_buff *skb,
         } while (!hotdrop);
 
 #ifdef CONFIG_NETFILTER_DEBUG
-        ((struct ip6t_entry *)table_base)->comefrom = NETFILTER_LINK_POISON;
+        tb_comefrom = NETFILTER_LINK_POISON;
 #endif
         xt_info_rdunlock_bh();
 
@@ -472,6 +473,8 @@ ip6t_do_table(struct sk_buff *skb,
                 return NF_DROP;
         else return verdict;
 #endif
+
+#undef tb_comefrom
 }
 
 /* Figures out from what hook each rule can be called: returns 0 if