2019 SDN上机第7次作业

1.根据P4教程,将basic和basic_tunnel两个案例程序补充完整,成功运行。

basic案例补充:

include <core.p4>
include <v1model.p4>

 const bit<16> TYPE_IPV4 = 0x800;

/*************************************************************************
*********************** H E A D E R S  ***********************************
*************************************************************************/

typedef bit<9>  egressSpec_t;
typedef bit<48> macAddr_t;
typedef bit<32> ip4Addr_t;

 header ethernet_t {
macAddr_t dstAddr;
macAddr_t srcAddr;
bit<16>   etherType;
}

header ipv4_t {
bit<4>    version;
bit<4>    ihl;
bit<8>    diffserv;
bit<16>   totalLen;
bit<16>   identification;
bit<3>    flags;
bit<13>   fragOffset;
bit<8>    ttl;
bit<8>    protocol;
bit<16>   hdrChecksum;
ip4Addr_t srcAddr;
ip4Addr_t dstAddr;
}

struct metadata {
/* empty */
}

struct headers {
ethernet_t   ethernet;
ipv4_t       ipv4;
}

/*************************************************************************
*********************** P A R S E R  ***********************************
*************************************************************************/

parser MyParser(packet_in packet,
            out headers hdr,
            inout metadata meta,
            inout standard_metadata_t standard_metadata) {

state start {
    transition parse_ethernet;
}

state parse_ethernet {
    packet.extract(hdr.ethernet);
    transition select(hdr.ethernet.etherType) {
        TYPE_IPV4: parse_ipv4;
        default: accept;
    }
}

state parse_ipv4 {
    packet.extract(hdr.ipv4);
    transition accept;
}

}

/*************************************************************************
************   C H E C K S U M    V E R I F I C A T I O N   *************
*************************************************************************/

 control MyVerifyChecksum(inout headers hdr, inout metadata meta) {   
apply {  }
}


/*************************************************************************
**************  I N G R E S S   P R O C E S S I N G   *******************
*************************************************************************/

control MyIngress(inout headers hdr,
              inout metadata meta,
              inout standard_metadata_t standard_metadata) {
action drop() {
    mark_to_drop(standard_metadata);
    }
   action ipv4_forward(macAddr_t dstAddr, egressSpec_t port) {
    standard_metadata.egress_spec = port;
    hdr.ethernet.srcAddr = hdr.ethernet.dstAddr;
    hdr.ethernet.dstAddr = dstAddr;
    hdr.ipv4.ttl = hdr.ipv4.ttl - 1;
   }

table ipv4_lpm {
    key = {
        hdr.ipv4.dstAddr: lpm;
    }
    actions = {
        ipv4_forward;
        drop;
        NoAction;
    }
    size = 1024;
    default_action = drop();
}

apply {
    if (hdr.ipv4.isValid()) {
        ipv4_lpm.apply();
    }
}
}

/*************************************************************************
****************  E G R E S S   P R O C E S S I N G   *******************
*************************************************************************/

control MyEgress(inout headers hdr,
             inout metadata meta,
             inout standard_metadata_t standard_metadata) {
apply {  }
}

        /*************************************************************************
 *************   C H E C K S U M    C O M P U T A T I O N   **************
 *************************************************************************/

control MyComputeChecksum(inout headers  hdr, inout metadata meta) {
 apply {
update_checksum(
    hdr.ipv4.isValid(),
        { hdr.ipv4.version,
      hdr.ipv4.ihl,
          hdr.ipv4.diffserv,
          hdr.ipv4.totalLen,
          hdr.ipv4.identification,
          hdr.ipv4.flags,
          hdr.ipv4.fragOffset,
          hdr.ipv4.ttl,
          hdr.ipv4.protocol,
          hdr.ipv4.srcAddr,
          hdr.ipv4.dstAddr },
        hdr.ipv4.hdrChecksum,
        HashAlgorithm.csum16);
}
 }

 /*************************************************************************
 ***********************  D E P A R S E R  *******************************
 *************************************************************************/

control MyDeparser(packet_out packet, in headers hdr) {
apply {
    packet.emit(hdr.ethernet);
    packet.emit(hdr.ipv4);
}
}

/*************************************************************************
***********************  S W I T C H  *******************************
*************************************************************************/

V1Switch(
MyParser(),
MyVerifyChecksum(),
MyIngress(),
MyEgress(),
 MyComputeChecksum(),
MyDeparser()
) main;

运行:

basic_tunnel案例补充:

include <core.p4>
include <v1model.p4>

const bit<16> TYPE_MYTUNNEL = 0x1212;
const bit<16> TYPE_IPV4 = 0x800;

 /*************************************************************************
*********************** H E A D E R S  ***********************************
*************************************************************************/

typedef bit<9>  egressSpec_t;
typedef bit<48> macAddr_t;
 typedef bit<32> ip4Addr_t;

 header ethernet_t {
macAddr_t dstAddr;
macAddr_t srcAddr;
bit<16>   etherType;
}

 header myTunnel_t {
bit<16> proto_id;
bit<16> dst_id;
}

 header ipv4_t {
bit<4>    version;
bit<4>    ihl;
bit<8>    diffserv;
bit<16>   totalLen;
bit<16>   identification;
bit<3>    flags;
bit<13>   fragOffset;
bit<8>    ttl;
bit<8>    protocol;
bit<16>   hdrChecksum;
ip4Addr_t srcAddr;
ip4Addr_t dstAddr;
 }

 struct metadata {
/* empty */
 }

struct headers {
ethernet_t   ethernet;
myTunnel_t   myTunnel;
ipv4_t       ipv4;
}

 /*************************************************************************
*********************** P A R S E R  ***********************************
*************************************************************************/

parser MyParser(packet_in packet,
            out headers hdr,
            inout metadata meta,
            inout standard_metadata_t standard_metadata) {

state start {
    transition parse_ethernet;
}

state parse_ethernet {
    packet.extract(hdr.ethernet);
    transition select(hdr.ethernet.etherType) {
        TYPE_MYTUNNEL: parse_myTunnel;
        TYPE_IPV4: parse_ipv4;
        default: accept;
    }
}

state parse_myTunnel {
    packet.extract(hdr.myTunnel);
    transition select(hdr.myTunnel.proto_id) {
        TYPE_IPV4: parse_ipv4;
        default: accept;
    }
}

state parse_ipv4 {
    packet.extract(hdr.ipv4);
    transition accept;
}

}

 /*************************************************************************
************   C H E C K S U M    V E R I F I C A T I O N   *************
*************************************************************************/

 control MyVerifyChecksum(inout headers hdr, inout metadata meta) {   
apply {  }
}


/*************************************************************************
**************  I N G R E S S   P R O C E S S I N G   *******************
*************************************************************************/

 control MyIngress(inout headers hdr,
              inout metadata meta,
              inout standard_metadata_t standard_metadata) {
action drop() {
    mark_to_drop(standard_metadata);
}

action ipv4_forward(macAddr_t dstAddr, egressSpec_t port) {
    standard_metadata.egress_spec = port;
    hdr.ethernet.srcAddr = hdr.ethernet.dstAddr;
    hdr.ethernet.dstAddr = dstAddr;
    hdr.ipv4.ttl = hdr.ipv4.ttl - 1;
}

table ipv4_lpm {
    key = {
        hdr.ipv4.dstAddr: lpm;
    }
    actions = {
        ipv4_forward;
        drop;
        NoAction;
    }
    size = 1024;
    default_action = drop();
}

action myTunnel_forward(egressSpec_t port) {
    standard_metadata.egress_spec = port;
}

table myTunnel_exact {
    key = {
        hdr.myTunnel.dst_id: exact;
    }
    actions = {
        myTunnel_forward;
        drop;
    }
    size = 1024;
    default_action = drop();
}

apply {
    if (hdr.ipv4.isValid() && !hdr.myTunnel.isValid()) {
        // Process only non-tunneled IPv4 packets
        ipv4_lpm.apply();
    }

    if (hdr.myTunnel.isValid()) {
        // process tunneled packets
        myTunnel_exact.apply();
    }
}
}

/*************************************************************************
****************  E G R E S S   P R O C E S S I N G   *******************
*************************************************************************/

control MyEgress(inout headers hdr,
             inout metadata meta,
             inout standard_metadata_t standard_metadata) {
apply {  }
}

 /*************************************************************************
 *************   C H E C K S U M    C O M P U T A T I O N   **************
 *************************************************************************/

 control MyComputeChecksum(inout headers  hdr, inout metadata meta) {
 apply {
update_checksum(
    hdr.ipv4.isValid(),
        { hdr.ipv4.version,
      hdr.ipv4.ihl,
          hdr.ipv4.diffserv,
          hdr.ipv4.totalLen,
          hdr.ipv4.identification,
          hdr.ipv4.flags,
          hdr.ipv4.fragOffset,
          hdr.ipv4.ttl,
          hdr.ipv4.protocol,
          hdr.ipv4.srcAddr,
          hdr.ipv4.dstAddr },
        hdr.ipv4.hdrChecksum,
        HashAlgorithm.csum16);
}
 }

/*************************************************************************
***********************  D E P A R S E R  *******************************
*************************************************************************/

 control MyDeparser(packet_out packet, in headers hdr) {
apply {
    packet.emit(hdr.ethernet);
    packet.emit(hdr.myTunnel);
    packet.emit(hdr.ipv4);
}
}

/*************************************************************************
 ***********************  S W I T C H  *******************************
 *************************************************************************/

V1Switch(
MyParser(),
MyVerifyChecksum(),
MyIngress(),
 MyEgress(),
 MyComputeChecksum(),
MyDeparser()
 ) main;

运行:

2.说明案例程序的编译执行流程。

案例一:

  • 执行代码
    命令 :make run
  • 注意:在进入basic文件夹,输入make run 编译运行
  • ping h1 h2
  • pingall

    案例二:
  • 执行代码
  • xterm h1 和 h2
    命令:xterm h1 h2
    目的:打开两个主机
  • 在主机2输入./receive
  • 在主机1输入要发送的消息
    ./send.py 10.0.2.2 “hello”
  • 检查主机2的xterm界面,是否收到消息
  • 在主机1的xterm界面修改IP地址,再一次发送信息
    命令:./send.py 10.0.3.3 "hello" --dst_id 2
  • 检查主机2的xterm界面,查看是否已经接收到了信息,

3.提交你对P4的认识和体会。

答:P4 用于SDN控制协议,p4作为新的网络编程语言,与openFlow不同的是,p4可以实现Protocol-independent,这弥补了OpenFlow最主要的缺陷。此外还有一点需要注意的是,OpenFlow提供了一种控制器和数据面的动态交互的协议,是一种南向协议。而P4只是一个数据面的编程语言。

posted @ 2019-12-14 23:47  小同学-  阅读(152)  评论(0编辑  收藏  举报