ptype_base和ptype_all在内核中存储的情况如下图: 可以看到,ptype_base为一个hash表,而ptype_all为一个双向链表.每一个里面注册的协议都用一个struct packet_type表示. struct packet_type { unsigned short type; /*协议类型*/ struct net_device *dev; int (*func) (struct sk_buff *, struct net_d...
ptype_base和ptype_all理解,netid_receive_skb()函数注解 在数据包接收过程的那篇笔记中可以知道,在数据包的处理函数netif_receive_skb中,会先看ptype_all中是否有注册的协议,如果有,则调用相应的处理函数,然后再到 ptype_base中,找到合适的协议,将skb发送到相关协议的处理函数.比如ip协议(ip_rcv)或者arp(arp...
for(ptype=ptype_base[ntohs(type)&15];ptype;ptype=ptype->next) {if(ptype->type == type && (!ptype->dev || ptype->dev == skb->dev)) {if(pt_prev) {if(!pt_prev->data) deliver_to_old_ones(pt_prev, skb,0);else{/*到这里,那么pt_prev指针不为空,ptype(当前的)不为空,那...
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<⼆>实现ptype_base和ptype_all链讲了上⾯的东西后咱们来看ptype_base及ptype_all链相关的东西。这两个链的作⽤在这⾥就不讲了。因为有了上⾯的东西，所以涉及到⼀个skbuff共享的问题，如果都⽤skb_clone或者skb_copy，那么性能将是很低的。所以在linux中使⽤了skb共享的计数，就是⽤skb->...
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可以看到,ptype_base为一个hash表,而ptype_all为一个双向链表.每一个里面注册的协议都用一个struct packet_type表示. struct packet_type { unsigned short type; /*协议类型*/ struct net_device *dev; int (*func) (struct sk_buff *, struct net_device *, ...
<二>实现ptype_base和ptype_all链 讲了上面的东西后咱们来看ptype_base及ptype_all链相关的东西。这两个链的作用在这里就不讲了。 因为有了上面的东西, 所以涉及到一个skbuff共享的问题, 如果都用skb_clone或者skb_copy,那么性能将是很低的。