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;
}

这只是一个简单的DPDK ACL代码示例，实际应用中可能需要根据具体需求进行更复杂的规则定义和匹配逻辑。希望这个示例能帮助你入门DPDK ACL的使用。

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