10个 OvS的入门开发的代码案例-DPDK中文网

以下是10个 OvS（Open vSwitch）的入门开发的代码案例：

创建一个简单的OvS交换机实例。

#include <stdio.h>
#include <stdlib.h>
#include <openvswitch/vconn.h>
#include <openvswitch/ofpbuf.h>

int main() {
    struct vconn *vconn;
    const char *target = "tcp:127.0.0.1:6653";
    
    // 连接到OvS交换机
    vconn = vconn_open(target);
    if (vconn == NULL) {
        printf("连接失败\n");
        return -1;
    }
    
    printf("成功连接到OvS交换机\n");
    
    // 关闭连接
    vconn_close(vconn);
    
    return 0;
}

获取OvS交换机的端口信息。

#include <stdio.h>
#include <stdlib.h>
#include <openvswitch/vswitch-idl.h>

int main() {
    struct ovsdb_idl *idl;
    
    // 初始化OVS数据库IDL对象
    idl = ovsdb_idl_create();
    
    // 连接到本地OVS数据库
    if (ovsdb_idl_connect(idl, "unix:/var/run/openvswitch/db.sock") != 0) {
        printf("连接到OVS数据库失败\n");
        return -1;
    }
    
    // 获取端口信息
    const struct ovsrec_interface_table *iface_table = &idl->tables->interface;
    
    const struct ovsrec_interface *iface;
    
	// 遍历所有接口
	OVSDATABASE_FOR_EACH(iface, iface_table) {
	    printf("接口名称：%s\n", iface->name);
	}
    
    // 释放资源
    ovsdb_idl_destroy(idl);
    
    return 0;
}

创建一个OvS交换机端口。

#include <stdio.h>
#include <stdlib.h>
#include <openvswitch/vswitch-idl.h>

int main() {
    struct ovsdb_idl *idl;
    
    // 初始化OVS数据库IDL对象
    idl = ovsdb_idl_create();
    
    // 连接到本地OVS数据库
    if (ovsdb_idl_connect(idl, "unix:/var/run/openvswitch/db.sock") != 0) {
        printf("连接到OVS数据库失败\n");
        return -1;
    }
    
    // 创建一个端口
	const char *port_name = "eth0";
	
	struct ovsrec_interface interface_row;
	memset(&interface_row, 0, sizeof(interface_row));
	ovsrec_interface_init(&interface_row, idl);
	
	STRDUP(interface_row.name, port_name);
	interface_row.type = OVSREC_INTERFACE_TYPE_ETHERNET;
	
	ovsdb_idl_add_row(idl, &interface_row._uuid);
	
	printf("成功创建端口：%s\n", port_name);
    
    // 提交更改到OVS数据库
	if (ovsdb_idl_txn_commit_block(idl) != 0) {
	    printf("提交更改失败\n");
	    return -1;
	}
	
	printf("成功提交更改\n");
	
	// 释放资源
	ovsdb_idl_destroy(idl);
	
	return 0;
}

添加流表项到OvS交换机。

#include <stdio.h>
#include <stdlib.h>
#include <openvswitch/ofp-parse.h>
#include <openvswitch/ofpbuf.h>
#include <openvswitch/vconn.h>

int main() {
    struct vconn *vconn;
    const char *target = "tcp:127.0.0.1:6653";
    
    // 连接到OvS交换机
    vconn = vconn_open(target);
    if (vconn == NULL) {
        printf("连接失败\n");
        return -1;
    }
    
    printf("成功连接到OvS交换机\n");
    
    // 创建流表项
	struct ofpbuf *ofpacts = ofpbuf_new(OFPP_MAX);
	
	ofpact_put_OUTPUT(ofpacts, 1);
	
	// 添加流表项到OVS交换机
	struct ofputil_flow_mod fm;
	memset(&fm, 0, sizeof(fm));
	fm.table_id = OFPTT_ALL;
	fm.command = OFPFC_ADD;
	fm.buffer_id = OVS_BUFFER_ID_INVALID;
	fm.priority = 1000;

	ofpact_put_GOTO_TABLE(ofpacts, 1);
	
	fm.ofpat_args.actions_len = ofpacts->size;
	fm.ofpat_args.actions_buf = ofpacts->data;

	vconn_send(vconn, &fm, sizeof(fm), ofpacts);
	
	printf("成功添加流表项\n");
    
    // 关闭连接
	vconn_close(vconn);

	return 0;
}

设置OvS交换机端口的MAC地址。

#include <stdio.h>
#include <stdlib.h>
#include <openvswitch/vswitch-idl.h>

int main() {
    struct ovsdb_idl *idl;
    
    // 初始化OVS数据库IDL对象
    idl = ovsdb_idl_create();
    
    // 连接到本地OVS数据库
    if (ovsdb_idl_connect(idl, "unix:/var/run/openvswitch/db.sock") != 0) {
        printf("连接到OVS数据库失败\n");
        return -1;
    }
    
    // 设置端口的MAC地址
	const char *port_name = "eth0";
	const char *mac_address = "00:11:22:33:44:55";
	
	struct ovsrec_interface *iface = ovsrec_interface_first(idl);
	
	while (iface != NULL) {
	    if (strcmp(iface->name, port_name) == 0) {
	        STRDUP(iface->mac_in_use, mac_address);
	        break;
	    }
	    
	    iface = ovsrec_interface_next(iface);
	}
	
	if (iface == NULL) {
	    printf("找不到端口：%s\n", port_name);
	    return -1;
	}
	
	printf("成功设置端口的MAC地址\n");
	
	// 提交更改到OVS数据库
	if (ovsdb_idl_txn_commit_block(idl) != 0) {
	    printf("提交更改失败\n");
	    return -1;
	}
	
	printf("成功提交更改\n");
	
	// 释放资源
	ovsdb_idl_destroy(idl);
	
	return 0;
}

获取OvS交换机流表项。

#include <stdio.h>
#include <stdlib.h>
#include <openvswitch/ofp-parse.h>
#include <openvswitch/ofpbuf.h>
#include <openvswitch/vconn.h>

int main() {
    struct vconn *vconn;
    const char *target = "tcp:127.0.0.1:6653";
    
    // 连接到OvS交换机
    vconn = vconn_open(target);
    if (vconn == NULL) {
        printf("连接失败\n");
        return -1;
    }
    
    printf("成功连接到OvS交换机\n");
    
    // 获取流表项
	struct ofputil_flow_stats_request req;
	memset(&req, 0, sizeof(req));
	req.table_id = OFPTT_ALL;

	struct ofpbuf *request = ofputil_encode_flow_stats_request(&req);

	vconn_send_block(vconn, request->data, request->size);
	
	uint8_t buffer[4096];
	int n_bytes = vconn_recv(vconn, buffer, sizeof(buffer));
	
	if (n_bytes > 0) {
	    struct ofpbuf *reply = ofpbuf_new(4096);
	    ofpbuf_use_const(reply, buffer, n_bytes);
	    
	    struct ofputil_flow_stats stats;
	    memset(&stats, 0, sizeof(stats));

	    while (!ofputil_pull_flow_stats(reply->data,
	                                    reply->size,
	                                    &stats)) {
	        printf("流表项优先级：%d\n", stats.priority);
	        printf("匹配字段数量：%d\n", stats.match.n_fields);

	        /* 可以在这里继续处理其他流表项信息 */
	        
	        memset(&stats, 0, sizeof(stats));
	    }

	    ofpbuf_delete(reply);
	}
    
    // 关闭连接
	vconn_close(vconn);

	return 0;
}

修改OvS交换机端口的状态。

#include <stdio.h>
#include <stdlib.h>
#include <openvswitch/vswitch-idl.h>

int main() {
    struct ovsdb_idl *idl;
    
    // 初始化OVS数据库IDL对象
    idl = ovsdb_idl_create();
    
    // 连接到本地OVS数据库
    if (ovsdb_idl_connect(idl, "unix:/var/run/openvswitch/db.sock") != 0) {
        printf("连接到OVS数据库失败\n");
        return -1;
    }
    
    // 修改端口状态为DOWN
	const char *port_name = "eth0";
	
	struct ovsrec_interface *iface = ovsrec_interface_first(idl);
	
	while (iface != NULL) {
	    if (strcmp(iface->name, port_name) == 0) {
	        iface->admin_state = OVSREC_INTERFACE_ADMIN_STATE_DOWN;
	        break;
	    }
	    
	    iface = ovsrec_interface_next(iface);
	}
	
	if (iface == NULL) {
	    printf("找不到端口：%s\n", port_name);
	    return -1;
	}
	
	printf("成功修改端口状态为DOWN\n");
	
	// 提交更改到OVS数据库
	if (ovsdb_idl_txn_commit_block(idl) != 0) {
	    printf("提交更改失败\n");
	    return -1;
	}
	
	printf("成功提交更改\n");
	
	// 释放资源
	ovsdb_idl_destroy(idl);
	
	return 0;
}

删除OvS交换机的流表项。

#include <stdio.h>
#include <stdlib.h>
#include <openvswitch/ofp-parse.h>
#include <openvswitch/ofpbuf.h>
#include <openvswitch/vconn.h>

int main() {
    struct vconn *vconn;
    const char *target = "tcp:127.0.0.1:6653";
    
    // 连接到OvS交换机
    vconn = vconn_open(target);
    if (vconn == NULL) {
        printf("连接失败\n");
        return -1;
    }
    
    printf("成功连接到OvS交换机\n");
    
    // 删除流表项
	struct ofputil_flow_mod fm;
	memset(&fm, 0, sizeof(fm));
	fm.table_id = OFPTT_ALL;
	fm.command = OFPFC_DELETE;
	
	vconn_send(vconn, &fm, sizeof(fm), NULL);
	
	printf("成功删除流表项\n");
    
    // 关闭连接
	vconn_close(vconn);

	return 0;
}

获取OvS交换机的统计信息。

#include <stdio.h>
#include <stdlib.h>
#include <openvswitch/ofp-parse.h>
#include <openvswitch/ofpbuf.h>
#include <openvswitch/vconn.h>

int main() {
    struct vconn *vconn;
    const char *target = "tcp:127.0.0.1:6653";
    
    // 连接到OvS交换机
    vconn = vconn_open(target);
    if (vconn == NULL) {
        printf("连接失败\n");
        return -1;
    }
    
    printf("成功连接到OvS交换机\n");
    
	// 请求获取统计信息
	struct ofputil_port_stats_request req;
	memset(&req, 0, sizeof(req));
	req.port_no = OFPP_ANY;

	struct ofpbuf *request = ofputil_encode_port_stats_request(&req);

	vconn_send_block(vconn, request->data, request->size);
	
	uint8_t buffer[4096];
	int n_bytes = vconn_recv(vconn, buffer, sizeof(buffer));
	
	if (n_bytes > 0) {
	    struct ofpbuf *reply = ofpbuf_new(4096);
	    ofpbuf_use_const(reply, buffer, n_bytes);
	    
	    struct ofputil_port_stats stats;
	    memset(&stats, 0, sizeof(stats));

	    while (!ofputil_pull_port_stats(reply->data,
	                                    reply->size,
	                                    &stats)) {
	        printf("端口号：%d\n", stats.port_no);
	        printf("收到的数据包数量：%llu\n", stats.rx_packets);

	        /* 可以在这里继续处理其他统计信息 */
	        
	        memset(&stats, 0, sizeof(stats));
	    }

	    ofpbuf_delete(reply);
	}
    
    // 关闭连接
	vconn_close(vconn);

	return 0;
}

设置OvS交换机端口的速率限制。

#include <stdio.h>
#include <stdlib.h>
#include <openvswitch/vswitch-idl.h>

int main() {
    struct ovsdb_idl *idl;
    
    // 初始化OVS数据库IDL对象
    idl = ovsdb_idl_create();
    
    // 连接到本地OVS数据库
    if (ovsdb_idl_connect(idl, "unix:/var/run/openvswitch/db.sock") != 0) {
        printf("连接到OVS数据库失败\n");
        return -1;
    }
    
    // 设置端口的速率限制（带宽）
	const char *port_name = "eth0";
	int64_t rate_limit = 10000000; // 10Mbps
	
	struct ovsrec_interface *iface = ovsrec_interface_first(idl);
	
	while (iface != NULL) {
	    if (strcmp(iface->name, port_name) == 0) {
	        iface->ingress_policing_rate = rate_limit;
	        break;
	    }
	    
	    iface = ovsrec_interface_next(iface);
	}
	
	if (iface == NULL) {
	    printf("找不到端口：%s\n", port_name);
	    return -1;
	}
	
	printf("成功设置端口的速率限制\n");
	
	// 提交更改到OVS数据库
	if (ovsdb_idl_txn_commit_block(idl) != 0) {
	    printf("提交更改失败\n");
	    return -1;
	}
	
	printf("成功提交更改\n");
	
	// 释放资源
	ovsdb_idl_destroy(idl);
	
	return 0;
}

以上是10个OvS入门开发的代码案例，希望对您有帮助！

内容由零声教学AI助手提供，问题来源于学员提问