linux网络协议栈分析笔记10-arp邻居子系统3

关注

VIP免费原创最新推荐文章于 2026-06-09 10:34:14 发布 1.9k 阅读 AI 写同款· GEO 优化 ›

告别枯燥理论：手把手教你用STM32和串口助手玩转LED灯（Proteus仿真+代码详解）本文通过Proteus仿真和代码详解，手把手教你使用STM32和串口助手控制LED灯。从虚拟硬件搭建到实际电路实现，详细解析串口通信原理和STM32编程技巧，帮助开发者快速掌握嵌入式开发的核心技术。阅读详情

还是回到 neigh_resolve_output()

int neigh_resolve_output(struct sk_buff *skb)

{
     struct dst_entry *dst = skb_dst(skb);
     struct neighbour *neigh;
     int rc = 0;

     if (!dst || !(neigh = dst->neighbour)) 异常退出
          goto discard;

     __skb_pull(skb, skb_network_offset(skb));

    if (!neigh_event_send(neigh, skb)) {    判断邻居项是否有可用状态，如果可用，则把数据包发送出去
int err;
          struct net_device *dev = neigh->dev;
          if (dev->header_ops->cache && !dst->hh) {
               write_lock_bh(&neigh->lock);
               if (!dst->hh)
                    neigh_hh_init(neigh, dst, dst->ops->protocol);
               err = dev_hard_header(skb, dev, ntohs(skb->protocol),
                               neigh->ha, NULL, skb->len);
               write_unlock_bh(&neigh->lock);
          } else {
               read_lock_bh(&neigh->lock);
               err = dev_hard_header(skb, dev, ntohs(skb->protocol),