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Make MTU configurable for Netlink (#204)

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Here we add the implementation to make MTU value configurable instead of
hardcoding in `linkSet`.
This commit is contained in:
Raj
2025-07-08 15:54:57 -07:00
committed by GitHub
parent d16893d7b9
commit ad219fecf1
8 changed files with 231 additions and 111 deletions
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Sources/ContainerizationNetlink/NetlinkSession.swift
+18 -13
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@@ -67,12 +67,17 @@ public struct NetlinkSession {
/// - Parameters:
/// - interface: The name of the interface.
/// - up: The value to set the interface state to.
public func linkSet(interface: String, up: Bool) throws {
public func linkSet(interface: String, up: Bool, mtu: UInt32? = nil) throws {
// ip link set dev [interface] [up|down]
let interfaceIndex = try getInterfaceIndex(interface)
let mtuAttr = RTAttribute(
len: UInt16(RTAttribute.size + MemoryLayout<UInt32>.size), type: LinkAttributeType.IFLA_MTU)
let requestSize = NetlinkMessageHeader.size + InterfaceInfo.size + mtuAttr.paddedLen
// build the attribute only when mtu is supplied
let attr: RTAttribute? =
(mtu != nil)
? RTAttribute(
len: UInt16(RTAttribute.size + MemoryLayout<UInt32>.size),
type: LinkAttributeType.IFLA_MTU)
: nil
let requestSize = NetlinkMessageHeader.size + InterfaceInfo.size + (attr?.paddedLen ?? 0)
var requestBuffer = [UInt8](repeating: 0, count: requestSize)
var requestOffset = 0
@@ -91,16 +96,16 @@ public struct NetlinkSession {
change: InterfaceFlags.DEFAULT_CHANGE)
requestOffset = try requestInfo.appendBuffer(&requestBuffer, offset: requestOffset)
requestOffset = try mtuAttr.appendBuffer(&requestBuffer, offset: requestOffset)
guard
let newRequestOffset = requestBuffer.copyIn(
as: UInt32.self,
value: Self.mtu,
offset: requestOffset)
else {
throw NetlinkDataError.sendMarshalFailure
if let attr = attr, let m = mtu {
requestOffset = try attr.appendBuffer(&requestBuffer, offset: requestOffset)
guard
let newRequestOffset =
requestBuffer.copyIn(as: UInt32.self, value: m, offset: requestOffset)
else {
throw NetlinkDataError.sendMarshalFailure
}
requestOffset = newRequestOffset
}
requestOffset = newRequestOffset
guard requestOffset == requestSize else {
throw Error.unexpectedOffset(offset: requestOffset, size: requestSize)