1__be16 eth_type_trans(structsk_buff *skb,structnet_device *dev)2{3structethhdr *eth;45skb->dev =dev;6eth =eth_hdr(skb);78if(netdev_uses_dsa_tags(dev))9returnhtons(ETH_P_DSA);1011if(netdev_uses_trailer_tags(dev))12returnhtons(ETH_P_TRAILER);1314if( ntohs(eth->h_proto) >=...
sizeof(struct udphdr) + sizeof(app_data)); /* 构造数据区 */ p = skb_push(skb, sizeof(app_data)); memcpy(p, &app_data[0], sizeof(app_data)); p = skb_push(skb, sizeof(struct udphdr)); udphdr = (struct udphdr *)p; // 填充udphdr字段,略 skb_reset_transport_header(skb...
mac处理是通过eth_type_trans函数进行处理: __be16eth_type_trans(structsk_buff*skb,structnet_device*dev){unsignedshort_service_access_point;constunsignedshort*sap;conststructethhdr*eth;skb->dev=dev;/* 校正skb中mac头的指针 */skb_reset_mac_header(skb);eth=(structethhdr*)skb->data;/* 将data指...
unsigned char eth_addr[ETH_ALEN]; struct ethhdr *oeth; __be32 addr; __be16 port; u32 tcplen; oiph = ip_hdr( pskb ); tcph = (struct tcphdr *)((u_int32_t *)oiph + oiph->ihl); //dump_ethhdr( (struct ethhdr *)pskb->mac_header ); //dump_iphdr( oiph ); //dump_t...
char*payload = data +sizeof(*eth) +sizeof(*ip) +sizeof(*tcp) 这样的方法在ingress中是成功的,但是在egress宏实际获取数据是失败的,我尝试使用如下代码打印在改变payload大小: if(sport == bpf_htons(6379)) { inttcp_len = tcp_hdrlen(tcp); ...
skb->protocol=htons(ETH_P_IPV6);//表明包是ipv6数据包 skb->pkt_type=PACKET_HOST;//表明是发往本机的包 skb->dev=&can_control;//此处很重要,如果没有这条语句,则内核跑死。至少在我板子上是这样的。can_control是我的net_device结构体变量。 netif_rx(skb); ...
上面提到的在TC egress中skb->data_end-skb->data实际是IP+TCP+eth的大小,但是ingress中skb->data_end-skb->data实际是IP+TCP+eth+payload的大小的原因就是非线性区的存在导致的。 也就是data_end - data其实是线性区的大小,而skb->len是线性区加非线性区的大小,前者其实是skb->data_len,但是BPF程序中无...
char*payload=data+sizeof(*eth)+sizeof(*ip)+sizeof(*tcp) 1. 2. 3. 这样的方法在ingress中是成功的,但是在egress宏实际获取数据是失败的,我尝试使用如下代码打印在改变payload大小: if(sport==bpf_htons(6379)) { inttcp_len=tcp_hdrlen(tcp); ...
struct vlan_hdr *vhdr; int offset = skb->data - skb_mac_header(skb); int err;@@ -6012,13 +6011,8 @@ int __skb_vlan_pop(struct sk_buff *skb, u16 *vlan_tci)skb_postpull_rcsum(skb, skb->data + (2 * ETH_ALEN), VLAN_HLEN);v...
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