mirror of
https://github.com/osrg/gobgp.git
synced 2024-05-11 05:55:10 +00:00
117 lines
3.2 KiB
Go
117 lines
3.2 KiB
Go
// Copyright (C) 2016 Nippon Telegraph and Telephone Corporation.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
|
|
// implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
//go:build !windows
|
|
// +build !windows
|
|
|
|
package server
|
|
|
|
import (
|
|
"net"
|
|
"strings"
|
|
"syscall"
|
|
|
|
"github.com/eapache/channels"
|
|
|
|
"github.com/osrg/gobgp/v3/pkg/packet/bgp"
|
|
)
|
|
|
|
func cleanInfiniteChannel(ch *channels.InfiniteChannel) {
|
|
ch.Close()
|
|
// drain all remaining items
|
|
for range ch.Out() {
|
|
}
|
|
}
|
|
|
|
// Returns the binary formatted Administrative Shutdown Communication from the
|
|
// given string value.
|
|
func newAdministrativeCommunication(communication string) (data []byte) {
|
|
if communication == "" {
|
|
return nil
|
|
}
|
|
com := []byte(communication)
|
|
if len(com) > bgp.BGP_ERROR_ADMINISTRATIVE_COMMUNICATION_MAX {
|
|
data = []byte{bgp.BGP_ERROR_ADMINISTRATIVE_COMMUNICATION_MAX}
|
|
data = append(data, com[:bgp.BGP_ERROR_ADMINISTRATIVE_COMMUNICATION_MAX]...)
|
|
} else {
|
|
data = []byte{byte(len(com))}
|
|
data = append(data, com...)
|
|
}
|
|
return data
|
|
}
|
|
|
|
// Parses the given NOTIFICATION message data as a binary value and returns
|
|
// the Administrative Shutdown Communication in string and the rest binary.
|
|
func decodeAdministrativeCommunication(data []byte) (string, []byte) {
|
|
if len(data) == 0 {
|
|
return "", data
|
|
}
|
|
communicationLen := int(data[0])
|
|
if communicationLen > bgp.BGP_ERROR_ADMINISTRATIVE_COMMUNICATION_MAX {
|
|
communicationLen = bgp.BGP_ERROR_ADMINISTRATIVE_COMMUNICATION_MAX
|
|
}
|
|
if communicationLen > len(data)-1 {
|
|
communicationLen = len(data) - 1
|
|
}
|
|
return string(data[1 : communicationLen+1]), data[communicationLen+1:]
|
|
}
|
|
|
|
func extractFamilyFromTCPConn(conn *net.TCPConn) int {
|
|
family := syscall.AF_INET
|
|
if strings.Contains(conn.RemoteAddr().String(), "[") {
|
|
family = syscall.AF_INET6
|
|
}
|
|
return family
|
|
}
|
|
|
|
func setsockOptString(sc syscall.RawConn, level int, opt int, str string) error {
|
|
var opterr error
|
|
fn := func(s uintptr) {
|
|
opterr = syscall.SetsockoptString(int(s), level, opt, str)
|
|
}
|
|
err := sc.Control(fn)
|
|
if opterr == nil {
|
|
return err
|
|
}
|
|
return opterr
|
|
}
|
|
|
|
func setsockOptInt(sc syscall.RawConn, level, name, value int) error {
|
|
var opterr error
|
|
fn := func(s uintptr) {
|
|
opterr = syscall.SetsockoptInt(int(s), level, name, value)
|
|
}
|
|
err := sc.Control(fn)
|
|
if opterr == nil {
|
|
return err
|
|
}
|
|
return opterr
|
|
}
|
|
|
|
func setsockoptIpTtl(sc syscall.RawConn, family int, value int) error {
|
|
level := syscall.IPPROTO_IP
|
|
name := syscall.IP_TTL
|
|
if family == syscall.AF_INET6 {
|
|
level = syscall.IPPROTO_IPV6
|
|
name = syscall.IPV6_UNICAST_HOPS
|
|
}
|
|
return setsockOptInt(sc, level, name, value)
|
|
}
|
|
|
|
func setsockoptTcpMss(sc syscall.RawConn, family int, value uint16) error {
|
|
level := syscall.IPPROTO_TCP
|
|
name := syscall.TCP_MAXSEG
|
|
return setsockOptInt(sc, level, name, int(value))
|
|
}
|