netfilter: xtables: provide invoked family value to extensions

By passing in the family through which extensions were invoked, a bit
of data space can be reclaimed. The "family" member will be added to
the parameter structures and the check functions be adjusted.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>

1 files changed, 12 insertions, 11 deletions

diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index f29513cd139..89837a4eef7 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -321,7 +321,7 @@ int xt_find_revision(u8 af, const char *name, u8 revision, int target,
 }
 EXPORT_SYMBOL_GPL(xt_find_revision);
 
-int xt_check_match(struct xt_mtchk_param *par, u_int8_t family,
+int xt_check_match(struct xt_mtchk_param *par,
 		   unsigned int size, u_int8_t proto, bool inv_proto)
 {
 	if (XT_ALIGN(par->match->matchsize) != size &&
@@ -331,26 +331,27 @@ int xt_check_match(struct xt_mtchk_param *par, u_int8_t family,
 		 * because it uses a dynamic-size data set.
 		 */
 		printk("%s_tables: %s match: invalid size %Zu != %u\n",
-		       xt_prefix[family], par->match->name,
+		       xt_prefix[par->family], par->match->name,
 		       XT_ALIGN(par->match->matchsize), size);
 		return -EINVAL;
 	}
 	if (par->match->table != NULL &&
 	    strcmp(par->match->table, par->table) != 0) {
 		printk("%s_tables: %s match: only valid in %s table, not %s\n",
-		       xt_prefix[family], par->match->name,
+		       xt_prefix[par->family], par->match->name,
 		       par->match->table, par->table);
 		return -EINVAL;
 	}
 	if (par->match->hooks && (par->hook_mask & ~par->match->hooks) != 0) {
 		printk("%s_tables: %s match: bad hook_mask %#x/%#x\n",
-		       xt_prefix[family], par->match->name,
+		       xt_prefix[par->family], par->match->name,
 		       par->hook_mask, par->match->hooks);
 		return -EINVAL;
 	}
 	if (par->match->proto && (par->match->proto != proto || inv_proto)) {
 		printk("%s_tables: %s match: only valid for protocol %u\n",
-		       xt_prefix[family], par->match->name, par->match->proto);
+		       xt_prefix[par->family], par->match->name,
+		       par->match->proto);
 		return -EINVAL;
 	}
 	if (par->match->checkentry != NULL && !par->match->checkentry(par))
@@ -471,31 +472,31 @@ int xt_compat_match_to_user(struct xt_entry_match *m, void __user **dstptr,
 EXPORT_SYMBOL_GPL(xt_compat_match_to_user);
 #endif /* CONFIG_COMPAT */
 
-int xt_check_target(struct xt_tgchk_param *par, u_int8_t family,
+int xt_check_target(struct xt_tgchk_param *par,
 		    unsigned int size, u_int8_t proto, bool inv_proto)
 {
 	if (XT_ALIGN(par->target->targetsize) != size) {
 		printk("%s_tables: %s target: invalid size %Zu != %u\n",
-		       xt_prefix[family], par->target->name,
+		       xt_prefix[par->family], par->target->name,
 		       XT_ALIGN(par->target->targetsize), size);
 		return -EINVAL;
 	}
 	if (par->target->table != NULL &&
 	    strcmp(par->target->table, par->table) != 0) {
 		printk("%s_tables: %s target: only valid in %s table, not %s\n",
-		       xt_prefix[family], par->target->name,
+		       xt_prefix[par->family], par->target->name,
 		       par->target->table, par->table);
 		return -EINVAL;
 	}
 	if (par->target->hooks && (par->hook_mask & ~par->target->hooks) != 0) {
 		printk("%s_tables: %s target: bad hook_mask %#x/%#x\n",
-		       xt_prefix[family], par->target->name, par->hook_mask,
-		       par->target->hooks);
+		       xt_prefix[par->family], par->target->name,
+		       par->hook_mask, par->target->hooks);
 		return -EINVAL;
 	}
 	if (par->target->proto && (par->target->proto != proto || inv_proto)) {
 		printk("%s_tables: %s target: only valid for protocol %u\n",
-		       xt_prefix[family], par->target->name,
+		       xt_prefix[par->family], par->target->name,
 		       par->target->proto);
 		return -EINVAL;
 	}