backtrace/bk/trace_ipv6.go
2025-04-05 08:52:42 +00:00

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package backtrace
import (
"encoding/binary"
"net"
"golang.org/x/net/icmp"
"golang.org/x/net/ipv6"
)
func newPacketV6(id uint16, dst net.IP, ttl int) []byte {
// 创建ICMP消息回显请求
msg := icmp.Message{
Type: ipv6.ICMPTypeEchoRequest,
Body: &icmp.Echo{
ID: int(id),
Seq: int(id),
},
}
// 序列化ICMP消息
icmpData, _ := msg.Marshal(nil)
// 手动创建原始IPv6数据包头部
ipHeaderBytes := make([]byte, ipv6.HeaderLen)
// 设置版本和流量类别(第一个字节)
ipHeaderBytes[0] = (ipv6.Version << 4)
// 设置下一个头部(协议)
ipHeaderBytes[6] = ProtocolIPv6ICMP
// 设置跳数限制
ipHeaderBytes[7] = byte(ttl)
// 设置有效载荷长度2字节字段
binary.BigEndian.PutUint16(ipHeaderBytes[4:6], uint16(len(icmpData)))
// 设置目标地址最后16个字节
copy(ipHeaderBytes[24:40], dst.To16())
// 合并头部和ICMP数据
return append(ipHeaderBytes, icmpData...)
}