1 files changed, 44 insertions, 10 deletions

diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 150e5cf62f85..025d1a0af78b 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -329,6 +329,32 @@ int xt_find_revision(u8 af, const char *name, u8 revision, int target,
 }
 EXPORT_SYMBOL_GPL(xt_find_revision);
 
+static char *textify_hooks(char *buf, size_t size, unsigned int mask)
+{
+	static const char *const names[] = {
+		"PREROUTING", "INPUT", "FORWARD",
+		"OUTPUT", "POSTROUTING", "BROUTING",
+	};
+	unsigned int i;
+	char *p = buf;
+	bool np = false;
+	int res;
+
+	*p = '\0';
+	for (i = 0; i < ARRAY_SIZE(names); ++i) {
+		if (!(mask & (1 << i)))
+			continue;
+		res = snprintf(p, size, "%s%s", np ? "/" : "", names[i]);
+		if (res > 0) {
+			size -= res;
+			p += res;
+		}
+		np = true;
+	}
+
+	return buf;
+}
+
 int xt_check_match(struct xt_mtchk_param *par,
 		   unsigned int size, u_int8_t proto, bool inv_proto)
 {
@@ -338,26 +364,30 @@ int xt_check_match(struct xt_mtchk_param *par,
 		 * ebt_among is exempt from centralized matchsize checking
 		 * because it uses a dynamic-size data set.
 		 */
-		printk("%s_tables: %s match: invalid size %Zu != %u\n",
+		pr_err("%s_tables: %s match: invalid size %Zu != %u\n",
 		       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",
+		pr_err("%s_tables: %s match: only valid in %s table, not %s\n",
 		       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",
+		char used[64], allow[64];
+
+		pr_err("%s_tables: %s match: used from hooks %s, but only "
+		       "valid from %s\n",
 		       xt_prefix[par->family], par->match->name,
-		       par->hook_mask, par->match->hooks);
+		       textify_hooks(used, sizeof(used), par->hook_mask),
+		       textify_hooks(allow, sizeof(allow), 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",
+		pr_err("%s_tables: %s match: only valid for protocol %u\n",
 		       xt_prefix[par->family], par->match->name,
 		       par->match->proto);
 		return -EINVAL;
@@ -484,26 +514,30 @@ 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",
+		pr_err("%s_tables: %s target: invalid size %Zu != %u\n",
 		       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",
+		pr_err("%s_tables: %s target: only valid in %s table, not %s\n",
 		       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",
+		char used[64], allow[64];
+
+		pr_err("%s_tables: %s target: used from hooks %s, but only "
+		       "usable from %s\n",
 		       xt_prefix[par->family], par->target->name,
-		       par->hook_mask, par->target->hooks);
+		       textify_hooks(used, sizeof(used), par->hook_mask),
+		       textify_hooks(allow, sizeof(allow), 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",
+		pr_err("%s_tables: %s target: only valid for protocol %u\n",
 		       xt_prefix[par->family], par->target->name,
 		       par->target->proto);
 		return -EINVAL;