device: do not treat devices with non-digit characters after . as vlan devices

Fixes corner cases related to AP WDS station interfaces

Signed-off-by: Felix Fietkau <nbd@nbd.name>

3 files changed, 24 insertions, 16 deletions

diff --git a/device.c b/device.c
index d8617fc..c6b0b5f 100644
--- a/device.c
+++ b/device.c
@@ -650,13 +650,13 @@ device_find(const char *name)
 }
 
 struct device *
-device_get(const char *name, int create)
+__device_get(const char *name, int create, bool check_vlan)
 {
 	struct device *dev;
 
 	dev = avl_find_element(&devices, name, dev, avl);
 
-	if (!dev && strchr(name, '.'))
+	if (!dev && check_vlan && strchr(name, '.'))
 		return get_vlan_device_chain(name, create);
 
 	if (name[0] == '@')
diff --git a/device.h b/device.h
index 7d6c48b..1da6e3f 100644
--- a/device.h
+++ b/device.h
@@ -309,7 +309,13 @@ int device_init_virtual(struct device *dev, struct device_type *type, const char
 int device_init(struct device *dev, struct device_type *type, const char *ifname);
 void device_cleanup(struct device *dev);
 struct device *device_find(const char *name);
-struct device *device_get(const char *name, int create);
+
+struct device *__device_get(const char *name, int create, bool check_vlan);
+static inline struct device *device_get(const char *name, int create)
+{
+	return __device_get(name, create, true);
+}
+
 void device_add_user(struct device_user *dep, struct device *dev);
 void device_remove_user(struct device_user *dep);
 void device_broadcast_event(struct device *dev, enum device_event ev);
@@ -326,7 +332,7 @@ void device_dump_status(struct blob_buf *b, struct device *dev);
 
 void device_free_unused(struct device *dev);
 
-struct device *get_vlan_device_chain(const char *ifname, bool create);
+struct device *get_vlan_device_chain(const char *ifname, int create);
 void alias_notify_device(const char *name, struct device *dev);
 struct device *device_alias_get(const char *name);
 
diff --git a/vlan.c b/vlan.c
index 459c907..401cc94 100644
--- a/vlan.c
+++ b/vlan.c
@@ -14,6 +14,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <ctype.h>
 
 #include "netifd.h"
 #include "system.h"
@@ -238,18 +239,23 @@ error:
 
 static char *split_vlan(char *s)
 {
+retry:
 	s = strchr(s, '.');
 	if (!s)
-		goto out;
+		return NULL;
+
+	if (!isdigit(s[1])) {
+		s++;
+		goto retry;
+	}
 
 	*s = 0;
 	s++;
 
-out:
 	return s;
 }
 
-struct device *get_vlan_device_chain(const char *ifname, bool create)
+struct device *get_vlan_device_chain(const char *ifname, int create)
 {
 	struct device *dev = NULL;
 	char *buf, *s, *next;
@@ -259,23 +265,19 @@ struct device *get_vlan_device_chain(const char *ifname, bool create)
 		return NULL;
 
 	s = split_vlan(buf);
-	dev = device_get(buf, create);
+	dev = __device_get(buf, create, false);
 	if (!dev)
-		goto error;
+		goto out;
 
-	do {
+	while (s) {
 		next = split_vlan(s);
 		dev = get_vlan_device(dev, s, create);
 		if (!dev)
-			goto error;
+			break;
 
 		s = next;
-		if (!s)
-			goto out;
-	} while (1);
+	}
 
-error:
-	dev = NULL;
 out:
 	free(buf);
 	return dev;