51 lines
1.2 KiB
Go
51 lines
1.2 KiB
Go
// Copyright 2018-present the CoreDHCP Authors. All rights reserved
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// This source code is licensed under the MIT license found in the
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// LICENSE file in the root directory of this source tree.
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package mtu
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import (
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"errors"
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"fmt"
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"strconv"
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"github.com/insomniacslk/dhcp/dhcpv4"
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"github.com/coredhcp/coredhcp/handler"
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"github.com/coredhcp/coredhcp/logger"
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"github.com/coredhcp/coredhcp/plugins"
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)
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var log = logger.GetLogger("plugins/mtu")
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// Plugin wraps the MTU plugin information.
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var Plugin = plugins.Plugin{
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Name: "mtu",
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Setup4: setup4,
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// No Setup6 since DHCPv6 does not have MTU-related options
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}
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var (
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mtu int
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)
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func setup4(args ...string) (handler.Handler4, error) {
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if len(args) != 1 {
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return nil, errors.New("need one mtu value")
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}
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var err error
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if mtu, err = strconv.Atoi(args[0]); err != nil {
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return nil, fmt.Errorf("invalid mtu: %v", args[0])
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}
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log.Infof("loaded mtu %d.", mtu)
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return Handler4, nil
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}
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// Handler4 handles DHCPv4 packets for the mtu plugin
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func Handler4(req, resp *dhcpv4.DHCPv4) (*dhcpv4.DHCPv4, bool) {
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if req.IsOptionRequested(dhcpv4.OptionInterfaceMTU) {
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resp.Options.Update(dhcpv4.Option{Code: dhcpv4.OptionInterfaceMTU, Value: dhcpv4.Uint16(mtu)})
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}
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return resp, false
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}
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