reset button interfaces

backend/src/api/network_api.py

@@ -2,6 +2,8 @@
 
 import asyncio
 import logging
+import os
+import subprocess
 from typing import Any, Dict, List, Optional
 
 from fastapi import APIRouter, Depends, HTTPException, WebSocket, WebSocketDisconnect
@@ -16,6 +18,8 @@ from src.utilities.interface_bridge_helpers import get_bridge_ports_once, read_i
 
 router = APIRouter()
 logger = logging.getLogger("network_router")
+_ETHTOOL_BIN = "/usr/sbin/ethtool" if os.path.exists("/usr/sbin/ethtool") else "ethtool"
+DEFAULT_INTERFACE_MTU = 1500
 
 ip: IPRoute | None = None
 ndb: NDB | None = None
@@ -106,6 +110,30 @@ class BridgeLinkStateEnableRequest(BaseModel):
     )
 
 
+class InterfaceResetDefaultsRequest(BaseModel):
+    """Payload for resetting one or more interfaces to baseline settings."""
+
+    interfaces: List[str] = Field(..., min_length=1, description="Interface names to reset.")
+
+
+class InterfaceResetDefaultsResult(BaseModel):
+    """Outcome for one interface reset attempt."""
+
+    interface: str = Field(..., description="Interface name.")
+    mtu: Optional[int] = Field(None, description="Resulting MTU after reset.")
+    ethernet_profile: Optional[Dict[str, Any]] = Field(
+        None,
+        description="Resulting speed/duplex/autoneg profile when available.",
+    )
+    message: str = Field(..., description="Human-readable reset result.")
+
+
+class InterfaceResetDefaultsResponse(BaseModel):
+    """Batch reset response for one or more interfaces."""
+
+    results: List[InterfaceResetDefaultsResult] = Field(default_factory=list)
+
+
 class BridgeMemberLinkStateInfo(BaseModel):
     """Current link-state snapshot for one bridge member."""
 
@@ -282,6 +310,38 @@ def publish_network_state_update(reason: str) -> None:
         logger.exception("Failed to publish network state update")
 
 
+def _reset_interface_defaults(ifname: str, ip_route: IPRoute) -> InterfaceResetDefaultsResult:
+    """Reset one interface to a conservative baseline configuration."""
+    idx = iface_index(ifname, ip_route)
+    messages: list[str] = []
+
+    ip_route.link("set", index=idx, state="down")
+    ip_route.link("set", index=idx, mtu=DEFAULT_INTERFACE_MTU)
+
+    try:
+        subprocess.run(
+            [_ETHTOOL_BIN, "-s", ifname, "autoneg", "on"],
+            capture_output=True,
+            text=True,
+            check=True,
+        )
+        messages.append("autoneg on")
+    except (FileNotFoundError, subprocess.CalledProcessError) as exc:
+        logger.debug("Failed to reset ethtool defaults on %s: %s", ifname, exc)
+        messages.append("autoneg unchanged")
+
+    ip_route.link("set", index=idx, state="up")
+    messages.append(f"mtu {DEFAULT_INTERFACE_MTU}")
+    messages.append("admin up")
+
+    return InterfaceResetDefaultsResult(
+        interface=ifname,
+        mtu=DEFAULT_INTERFACE_MTU,
+        ethernet_profile=read_interface_ethernet_profile(ifname),
+        message=", ".join(messages),
+    )
+
+
 @router.get("/interfaces", response_model=List[InterfaceInfo])
 def get_interfaces(ip: IPRoute = Depends(get_iproute)) -> List[InterfaceInfo]:
     """List host interfaces with addresses and decoded flags."""
@@ -422,6 +482,18 @@ def full_state(ip: IPRoute = Depends(get_iproute)) -> FullStateResponse:
     return _build_full_state_response(ip)
 
 
+@router.post("/interfaces/reset-defaults", response_model=InterfaceResetDefaultsResponse)
+def reset_interfaces_to_defaults(
+    req: InterfaceResetDefaultsRequest,
+    ip: IPRoute = Depends(get_iproute),
+) -> InterfaceResetDefaultsResponse:
+    """Reset listed interfaces to baseline MTU/autoneg/up settings."""
+    unique_ifaces = list(dict.fromkeys(req.interfaces))
+    results = [_reset_interface_defaults(ifname, ip) for ifname in unique_ifaces]
+    publish_network_state_update("interfaces_reset_defaults")
+    return InterfaceResetDefaultsResponse(results=results)
+
+
 @router.post("/bridge/create")
 def create_bridge(req: BridgeCreateRequest, ip: IPRoute = Depends(get_iproute)) -> dict:
     """Create a bridge and attach listed interfaces."""