UPF 如何完成报文处理

flowchart LR PKT[数据包到达] --> PDR["① PDR
包检测匹配"] PDR --> FAR["② FAR
转发动作"] PDR --> QER["③ QER
QoS执行"] PDR --> URR["④ URR
使用量统计"] FAR --> OUT[转发/丢弃/缓存] style PDR fill:#dbeafe,stroke:#3b82f6 style FAR fill:#d1fae5,stroke:#059669 style QER fill:#fef3c7,stroke:#d97706 style URR fill:#fce7f3,stroke:#ec4899