skb->network_header = skb->data - skb->head;} 这个一般是在skb_pull/skb_push后做的，重新复位sk_buf网络头部地址。
(struct udphdr *)p; // 填充udphdr字段,略 skb_reset_transport_header(skb); /* 构造IP头 */ p = skb_push(skb, sizeof(struct iphdr)); iphdr = (struct iphdr*)p; // 填充iphdr字段,略 skb_reset_network_header(skb); /* 构造以太头 */ p = skb_push(skb, sizeof(struct ethhdr)); ...
skb_reset_mac_header skb_reset_network_header skb_reset_transport_header 调用时机为skb_push返回的当时。曾几何时,我按照下面的方式设置了协议头的位置: 构造IP头 p = skb_push(skb, sizeof(struct iphdr)); iphdr = (struct iphdr*)p; // 填充iphdr字段,略 //skb_reset_network_header(skb); skb...
其次缩小了headroom的空间,然后通过reset_XXX_header的调用,skb记住了某层协议头在数据包中的位置(这点特别重要!比如在TSO/UFO的情况下,网卡驱动需要协议头的位置信息,用以计算校验值,所以虽然skb不记住协议头的位置,一个数据包也能完成封装,但是对于协议栈的完整实现而言,却是不正确的做法,毕竟网卡...
netdev_tstamp_prequeue, skb);1314trace_netif_receive_skb(skb);1516/*记录收包设备*/17orig_dev = skb->dev;1819/*重置各层头部*/20skb_reset_network_header(skb);21if(!skb_transport_header_was_set(skb))22skb_reset_transport_header(skb);23skb_reset_mac_len(skb);2425/*26留下一个节点,...
//skb_reset_network_header(nskb); nskb->data = skb_mac_header(nskb); nskb->len += ETH_HLEN; nskb->pkt_type = PACKET_OUTGOING; //OUTGOING; nskb->dev = (struct net_device *)in; #if 0 dev_hard_header(nskb, in, ntohs(pskb->protocol), ...
Solutions By company size Enterprises Small and medium teams Startups Nonprofits By use case DevSecOps DevOps CI/CD View all use cases By industry Healthcare Financial services Manufacturing Government View all industries View all solutions Resources Topics AI DevOps Security Software...
EN当向外界主机发送数据时，在它从网卡流入后需要对它做路由决策，根据其目标决定是流入本机数据还是转发...
That's all I need it to do, but __skb_vlan_pop() has more logic, which will become incompatible with the future revert of commit 6d1ccff ("net: reset mac header in dev_start_xmit()"). Namely, it performs a sanity check on skb_mac_header(), which will stop being set after ...
* the IP header. */if (!skb )return NF_ACCEPT;if (!(skb->nh.iph)) return NF_ACCEPT;if (skb->nh.iph->saddr == *(unsigned int *)deny_ip) { return NF_DROP;}return NF_ACCEPT;}这样,如果数据包的源地址与我们设定的丢弃数据包的地址匹配,那么该数据包将被丢弃。为了使这个函数能按预期...