FRR BGP协议分析11 -- ZEBRA初始化

我不是女神ヾ 2023-06-17 15:55 3阅读 0赞

zebra，翻译是斑马，它负责管理其他所有协议进程的路由信息的更新与交互，并负责与内核交换信息，整体的架构如下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FybWxpbnV4d3c_size_16_color_FFFFFF_t_70][]

Zebra的初始化在zebra/main.c里面，代码也来的干净直接

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FybWxpbnV4d3c_size_16_color_FFFFFF_t_70 1][]

*  frr\_init创建zebra主进程的master数据结构，用来做事件驱动，我们可以看下thread\_master的数据结构。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FybWxpbnV4d3c_size_16_color_FFFFFF_t_70 2][]

其整合了事件的可读、可写、定时器、信号的处理，后面有时间可以来学习下。

*  frr\_pthread\_init 初始化所有的线程链表
 *  zebra\_router\_init 初始化和策略路由PBR ?? 相关的HASH

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FybWxpbnV4d3c_size_16_color_FFFFFF_t_70 3][]

*  zserv

zebra作为其他协议进程的服务端，通过建立socket和其它的进程建立通道来交互信息。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FybWxpbnV4d3c_size_16_color_FFFFFF_t_70 4][]

zserv\_accept 接受客户端的请求，并创建一个新的客户端，还会给每个客户端创建一个线程处理客户端的读、写请求。

![20191210105609622.png][]

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客户端比如bgp会调用zclient\_new/zclient\_init初始化客服端连接到zebra服务端，并发送关心的事件到zebra的服务端。

![20191209174525252.png][]

bgp\_zebra\_connected 是连接服务端成功后，向zebra注册各种事件的回调函数。

*  rib\_init

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rib\_queue\_init初始化work queue相关的事情，ribq处理rib信息相关的，meta\_queue\_new会创建5个subq,每个队列是具有优先级的，也就是处理rib的消息是PQ的队列。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FybWxpbnV4d3c_size_16_color_FFFFFF_t_70 7][]

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![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FybWxpbnV4d3c_size_16_color_FFFFFF_t_70 9][]

zebra\_dplane\_init 是初始化data plane数据平面的信息，并会初始化linux kernel数据平面处理的函数，也就是会做一个适配层，隔离FRR和DP面，减少耦合。

zebra\_dplane\_start会Start the dataplane pthread，处理数据下发到DP 数据平面的消息。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FybWxpbnV4d3c_size_16_color_FFFFFF_t_70 10][]

*  zebra\_mpls\_init初始化MPLS相关的信息，主要完成：

1.  内核是否支持MPLS

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FybWxpbnV4d3c_size_16_color_FFFFFF_t_70 11][]

1.  Zebra处理MPLS 信息的work queue

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2FybWxpbnV4d3c_size_16_color_FFFFFF_t_70 12][]

*  最后frr\_run， zebra 主线程跑起来，全部初始化完成，其它的初始化点，后续在继续补充 ！！！！！！！

![20191209174713251.png][]

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