device: ignore MTU values below minimum

[project/netifd.git] / device.c

diff --git a/device.c b/device.c
index 996ffab..82596e4 100644 (file)
--- a/device.c
+++ b/device.c
@@ -240,12 +240,12 @@ device_init_settings(struct device *dev, struct blob_attr **tb)
        if ((cur = tb[DEV_ATTR_ENABLED]))
                disabled = !blobmsg_get_bool(cur);
 
        if ((cur = tb[DEV_ATTR_ENABLED]))
                disabled = !blobmsg_get_bool(cur);
 

-       if ((cur = tb[DEV_ATTR_MTU])) {
+       if ((cur = tb[DEV_ATTR_MTU]) && blobmsg_get_u32(cur) >= 68) {

                s->mtu = blobmsg_get_u32(cur);
                s->flags |= DEV_OPT_MTU;
        }
 
                s->mtu = blobmsg_get_u32(cur);
                s->flags |= DEV_OPT_MTU;
        }
 

-       if ((cur = tb[DEV_ATTR_MTU6])) {
+       if ((cur = tb[DEV_ATTR_MTU6]) && blobmsg_get_u32(cur) >= 1280) {

                s->mtu6 = blobmsg_get_u32(cur);
                s->flags |= DEV_OPT_MTU6;
        }
                s->mtu6 = blobmsg_get_u32(cur);
                s->flags |= DEV_OPT_MTU6;
        }