嗖嗖嗖

int netif_receive_skb(struct sk_buff *skb){//首先对VLAN报文进行处理if (vlan_rx_hook && vlan_rx_hook(&skb, skb->dev)) return NET_RX_SUCCESS;//遍历ptype_all链表，paket_type.type 为 ETH_P_ALL list_for_each_entry_rcu(ptype, &ptype_all, list) { if (!ptype->dev || ptype->dev == skb->dev) {if (pt_prev) ret = deliver_skb(skb, pt_prev, orig_dev);pt_prev = ptype;}}//网桥处理，有3种可能// 1. skb为单播，进入网桥设备，最终发送时将skb->dev由网桥设备brdev，跟换为实际的dev。// 2.再次进入netif_receive_skb，进行协议栈的处理// 3.丢弃报文if (handle_bridge(&skb, &pt_prev, &ret, orig_dev)) {goto out;}type = skb->protocol;//根据协议栈类型，遍历注册的协议栈处理函数。packet_type->func()//转而进入L3 处理，如：ip_rcv() arp_rcv()等list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) {if (ptype->type == type &&    (!ptype->dev || ptype->dev == skb->dev)) {if (pt_prev) ret = deliver_skb(skb, pt_prev, orig_dev);pt_prev = ptype;}}if (pt_prev) {ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);} else {kfree_skb(skb);/* Jamal, now you will not able to escape explaining * me how you were going to use this. :-) */ret = NET_RX_DROP;}out:rcu_read_unlock();return ret;