1/*2* These are the defined Ethernet Protocol ID's.3*/45#defineETH_P_LOOP 0x0060 /* Ethernet Loopback packet */6#defineETH_P_PUP 0x0200 /* Xerox PUP packet */7#defineETH_P_PUPAT 0x0201 /* Xerox PUP Addr Trans p
u_int8_t th_x2:4; /* (unused) */ u_int8_t th_off:4; /* data offset */ # endif # if __BYTE_ORDER == __BIG_ENDIAN u_int8_t th_off:4; /* data offset */ u_int8_t th_x2:4; /* (unused) */ # endif u_int8_t th_flags; # define TH_FIN 0x01 # define TH_...
8. const struct tcphdr *th = tcp_hdr(skb); 9. int length = (th->doff * 4) - sizeof(struct tcphdr); /* 选项的总长度 */ 10. ptr = (const unsigned char *) (th + 1); /* 选项的起始地址 */ 11. opt_rx->saw_tstamp = 0; /* Saw TIMESTAMP on last packet */ 12. whil...
3. 对于 mode l3 或者单播的 mode l2 报文,进入 ipvlan_handle_mode_l3 处理流程,首先通过 ipvlan_get_L3_hdr 获取到网络层的头信息,然后根据 ip 地址去查找到对应的子设备,最后调用 ipvlan_rcv_frame,将报文的 dev 设置为 IPVlan 子设备并返回 RX_HANDLER_ANOTHER,进行下一次收包。 4. 对于 mode l3s...
1、网络包几种格式structethhdr、 ether_header、 iphdr 、tcphdr、udphdr*eth的结构*struct ethhdr unsigned char h_destETH_ALEN;unsigned char h_sourceETH_ALEN;_be16 h_proto; _attribute_(packed);struct ether_headeru_int8_t ether_dhostETH_ALEN;/ destination ethaddru_int8_t ether_shostETH_ALE...
uint16_tmax_rx_pkt_len;/**< Stop receiving after size of this packet is received. */ uint16_tsplit_hdr_size;/**< Split header, e.g. for VLAN header. */ uint16_tnb_queues;/**< Number of receive queues. */ uint8_tenable_lro;/**< Enable LRO (Large Receive Offload). */ ...
该段代码用于从TCP包中提取FTP控制消息,即获取FTP命令和响应。具体分析如下:通过dp_packet_l4()函数获取TCP报文头部指针th。将TCP报文头部指针th转换为char类型的指针tcp_hdr。使用tcp
hdr_len;//writable header length of cloned skbunsignedinttruesize;//socket buffer(套接字缓存区的大小)atomic_t users;//对当前的struct sk_buff结构体的引用次数;__u32 priority;//这个struct sk_buff结构体的优先级sk_buff_data_t transport_header;//传输层头部的偏移量sk_buff_data_t network_...
struct sk_buff *nfct_reasm; #endif #ifdef CONFIG_BRIDGE_NETFILTER struct nf_bridge_info *nf_bridge; #endif __u32 nfmark; #endif /* CONFIG_NETFILTER */ 这些变量被netfilter使用(防火墙代码),内核编译选项是“Device Drivers->Networking support-> Networking options-> Network packet filtering”和两...
pppoe_hdr { ifdef CFG_LITTLEENDIAN u_int8_t ver :4; u_int8_t type : 4; # u_int8_t type: 4; u_int8_t ver 4; # u_int8_t code u_int16_t sid; _int16_ length; structpppoe_tag tag; }; #endif typedefstruct _mac_t { u_int_ mact_octet6]; } ...