DPDK实现tcpdump代码实现-DPDK中文网

以下是一个简单的示例代码，展示如何使用DPDK库实现类似tcpdump的功能：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <rte_eal.h>
#include <rte_ethdev.h>
#include <rte_ring.h>
#include <rte_mbuf.h>

#define NUM_MBUFS 8191
#define MBUF_CACHE_SIZE 250
#define BURST_SIZE 32

struct rte_mempool *mbuf_pool;
struct rte_ring *ring;

static void packet_capture(uint16_t port_id)
{
    struct rte_mbuf *bufs[BURST_SIZE];
    uint16_t nb_rx;

    while (1) {
        nb_rx = rte_eth_rx_burst(port_id, 0, bufs, BURST_SIZE);
        if (nb_rx == 0)
            continue;

        for (int i = 0; i < nb_rx; i++) {
            rte_pktmbuf_dump(stdout, bufs[i], bufs[i]->pkt_len);
            rte_ring_enqueue(ring, bufs[i]);
        }
    }
}

static void packet_print(void)
{
    struct rte_mbuf *bufs[BURST_SIZE];
    unsigned int num_pkts;

    while (1) {
        num_pkts = rte_ring_dequeue_burst(ring, (void *)bufs, BURST_SIZE, NULL);

        for (unsigned int i = 0; i < num_pkts; ++i) {
            printf("Packet content:\n");
            rte_pktmbuf_dump(stdout, bufs[i], bufs[i]->pkt_len);
            rte_pktmbuf_free(bufs[i]);
        }
    }
}

int main(int argc, char **argv)
{
    int ret;
    
    ret = rte_eal_init(argc, argv);
    if (ret < 0)
        rte_exit(EXIT_FAILURE, "Cannot init EAL\n");

    mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL", NUM_MBUFS * rte_eth_dev_count_avail(),
        MBUF_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
    if (mbuf_pool == NULL)
        rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");

    ring = rte_ring_create("PACKET_RING", NUM_MBUFS * rte_eth_dev_count_avail(),
        rte_socket_id(), RING_F_SP_ENQ | RING_F_SC_DEQ);
    if (ring == NULL)
        rte_exit(EXIT_FAILURE, "Cannot create ring\n");

    for (uint16_t port_id = 0; port_id < rte_eth_dev_count_avail(); ++port_id) {
        ret = rte_eth_dev_configure(port_id, 1, 1, NULL);
        if (ret != 0)
            rte_exit(EXIT_FAILURE, "Cannot configure device: %u\n", port_id);

        ret = rte_eth_rx_queue_setup(port_id, 0, BURST_SIZE,
            rte_eth_dev_socket_id(port_id), NULL, mbuf_pool);
        if (ret < 0)
            rte_exit(EXIT_FAILURE, "rx_queue_setup:err=%d,port=%u\n", ret,
                port_id);

        ret = rte_eth_dev_start(port_id);
        if (ret < 0)
            rte_exit(EXIT_FAILURE, "start err %d: port=%u\n", ret,
                port_id);

       printf("Capturing packets on port %u ...\n", port_id);
       packet_capture(port_id);
   }

   printf("Printing captured packets ...\n");
   packet_print();

   return 0;
}

请注意，此示例代码仅用于演示DPDK库的基本使用方法，并不具备完整的tcpdump功能。您可以根据实际需求进行修改和扩展。同时，运行此代码需要正确配置和启动DPDK环境，以及对网卡进行绑定操作。

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