dpdk的acl代码案例-DPDK中文网

以下是一个使用DPDK库实现ACL（访问控制列表）功能的简单代码示例：

#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <rte_eal.h>
#include <rte_common.h>
#include <rte_acl.h>
#define MAX_RULES 1024
// 定义ACL规则结构体
struct acl_rule {
    uint32_t ip_src;
    uint32_t ip_dst;
    uint16_t port_src;
    uint16_t port_dst;
};
int main(int argc, char *argv[]) {
    // 初始化DPDK环境
    rte_eal_init(argc, argv);
    // 创建ACL规则表
    struct rte_acl_ctx *acl_ctx = rte_acl_create(NULL);
    if (acl_ctx == NULL) {
        printf("Failed to create ACL context\n");
        return -1;
    }
    // 定义ACL规则数组
    struct acl_rule rules[MAX_RULES];
    // 添加一些示例规则到数组中，这里只添加两条规则作为演示
    rules[0].ip_src = rte_cpu_to_be_32(IPv4(192, 168, 0, 0));
	rules[0].ip_dst = rte_cpu_to_be_32(IPv4(10, 0, 0, 0));
	rules[0].port_src = rte_cpu_to_be_16(80);
	rules[0].port_dst = rte_cpu_to_be_16(8080);
	rules[1].ip_src = rte_cpu_to_be_32(IPv4(172, 16, 0, 0));
	rules[1].ip_dst = rte_cpu_to_be_32(IPv4(10, 0, 0, 0));
	rules[1].port_src = rte_cpu_to_be_16(443);
	rules[1].port_dst = rte_cpu_to_be_16(8443);
    // 构建ACL规则
    struct rte_acl_rule acl_rules[MAX_RULES];
    for (int i = 0; i < MAX_RULES; i++) {
        struct acl_rule *rule = &rules[i];
        struct rte_acl_field field_src_ip = { .value.u32 = rule->ip_src };
		struct rte_acl_field field_dst_ip = { .value.u32 = rule->ip_dst };
		struct rte_acl_field field_src_port = { .value.u16 = rule->port_src };
		struct rte_acl_field field_dst_port = { .value.u16 = rule->port_dst };
        // 将字段和偏移量添加到ACL规则中
		acl_rules[i].field[0] = field_src_ip;
		acl_rules[i].field[1] = field_dst_ip;
		acl_rules[i].field[2] = field_src_port;
		acl_rules[i].field[3] = field_dst_port;
        // 设置掩码以匹配所有位
		memset(&acl_rules[i].mask, 0xff, sizeof(acl_rules[i].mask));
        // 设置优先级为默认值，这里是i+1，也可以根据需要进行修改
		acl_rules[i].priority = i + 1;
    }
    // 在ACL上加载规则
    int num_rules_loaded = rte_acl_add_rules(acl_ctx, acl_rules, MAX_RULES);
	if (num_rules_loaded != MAX_RULES) {
		printf("Failed to load all rules\n");
		return -1;
	}
    // 进行ACL匹配测试
    struct acl_rule test_packet = {
        .ip_src = rte_cpu_to_be_32(IPv4(192, 168, 0, 1)),
		.ip_dst = rte_cpu_to_be_32(IPv4(10, 0, 0, 1)),
		.port_src = rte_cpu_to_be_16(80),
		.port_dst = rte_cpu_to_be_16(8080)
    };
    struct rte_acl_field field_test_ip_src = { .value.u32 = test_packet.ip_src };
	struct rte_acl_field field_test_ip_dst = { .value.u32 = test_packet.ip_dst };
	struct rte_acl_field field_test_port_src = { .value.u16 = test_packet.port_src };
	struct rte_acl_field field_test_port_dst = { .value.u16 = test_packet.port_dst };
    // 构建测试数据包
	struct rte_acl_field fields[4];
	fields[0] = field_test_ip_src;
	fields[1] = field_test_ip_dst;
	fields[2] = field_test_port_src;
	fields[3] = field_test_port_dst;
	uint32_t results[MAX_RULES];
	rte_acl_classify(acl_ctx, fields, results, MAX_RULES);
	printf("Matching rules:\n");
	for (int i=0; i<MAX_RULES; i++) {
	    if (results[i] != UINT32_MAX) {
	        printf("Rule %d matched with priority %u\n", i+1, acl_rules[i].priority);
	    }
	}
    // 销毁ACL上下文
	rte_acl_free(acl_ctx);
	return 0;
}