const unsigned total_length = length + sizeof(struct rte_ether_hdr) + sizeof(struct rte_ipv4_hdr) + sizeof(struct rte_udp_hdr);这一行计算了数据包的总长度。length是原始数据部分的长度,sizeof()函数用于获取结构体rte_ether_hdr、rte_ipv4_hdr和rte_udp_hdr的大小(以字节为单位),然后将它们累加...
void*data = (void*)(long)ctx->data; structethhdr*eth=data; structpacketp= {}; intkey =0; u32 lookup_addr; u16 *value; u8 flags; if(data +sizeof(struct ethhdr) > data_end) { returnXDP_DROP; } p.l3proto = bpf_htons(eth->h_proto); if(bpf_htons(eth->h_proto) == ETH_P...