fix(marker): reserve "global" name prefix for future marker inheritance

gns3server/compute/base_node.py

@@ -1093,7 +1093,7 @@ class BaseNode:
         # mark <bpf> [tag <id>] [pcap <path>] — tag/pcap keyword pairs, any order.
         # name travels from the controller REST layer (MarkerCreate schema) but is
         # validated here too as defense-in-depth against hand-edited topology files.
-        _MARKER_NAME_RE = re.compile(r"^[A-Za-z0-9][A-Za-z0-9_.-]*$")
+        _MARKER_NAME_RE = re.compile(r"^(?i)(?!global)[A-Za-z0-9][A-Za-z0-9_.-]*$")
         if not _MARKER_NAME_RE.match(name):
             raise UbridgeError(f"Invalid marker name: {name!r}")
         cmd = 'bridge add_packet_filter {bridge} {name} mark "{bpf}"'.format(

gns3server/schemas/controller/links.py

@@ -151,9 +151,9 @@ class MarkerCreate(BaseModel):
 
     name: Optional[str] = Field(
         None,
-        pattern=r"^[A-Za-z0-9][A-Za-z0-9_.-]*$",
+        pattern=r"^(?i)(?!global)[A-Za-z0-9][A-Za-z0-9_.-]*$",
         max_length=128,
-        description="Unique marker name on the link. Auto-generated when absent.",
+        description='Unique marker name on the link. Auto-generated when absent. Names starting with "global" are reserved.',
     )
     bpf: str
     tag: Optional[int] = None