ff_recvfrom failed: Operation not permitted

Question

Question:

I am writing a UDP socket application using F-Stack, but I am facing an issue with the ff_recvfrom call. The ff_recvfrom function fails even after successfully creating and binding the socket. Below, I’ve provided the complete code, configuration file, terminal output, and DPDK status.

I am unsure whether the issue lies in my configuration or how the socket is being used.

Here's the context:

I am using F-Stack, which is designed to accelerate network applications in user space by leveraging DPDK for packet processing.

The socket is successfully created with ff_socket and bound using ff_bind, but when I try to receive data with ff_recvfrom, it fails.

The application is supposed to listen for UDP packets on a specified IP and port

my code :

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <ff_api.h>

#define PORT 12345
#define BUFFER_SIZE 1024
#define IP_ADDRESS "192.168.1.3"

int main(int argc, char *argv[]) {
    if (ff_init(argc, argv) < 0) {
        fprintf(stderr, "F-Stack initialization failed\n");
        return -1;
    }

    int sock = ff_socket(AF_INET, SOCK_DGRAM, 0);
    if (sock < 0) {
        perror("ff_socket failed");
        return -1;
    }

    struct linux_sockaddr server_addr;
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sa_family = AF_INET;

    *((uint16_t *)server_addr.sa_data) = htons(PORT);
    inet_pton(AF_INET, IP_ADDRESS, server_addr.sa_data + 2);

    if (ff_bind(sock, &server_addr, sizeof(server_addr)) < 0) {
        perror("ff_bind failed");
        ff_close(sock);
        return -1;
    }

    printf("Listening for UDP packets on port %d...\n", PORT);

    char buffer[BUFFER_SIZE];
    struct linux_sockaddr from_addr;
    socklen_t from_len = sizeof(from_addr);

    while (1) {
        ssize_t received_bytes = ff_recvfrom(sock, buffer, BUFFER_SIZE - 1, 0,
                                             (struct linux_sockaddr *)&from_addr, &from_len);
        if (received_bytes < 0) {
            perror("ff_recvfrom failed");
            break;
        }

        buffer[received_bytes] = '\0';

        printf("Received %ld bytes from %s:%d: %s\n", received_bytes,
               inet_ntoa(*(struct in_addr *)&from_addr.sa_data[4]), ntohs(*(uint16_t *)&from_addr.sa_data[2]), buffer);
    }

    ff_close(sock);

    return 0;
}

Configuration File (config.ini):

[dpdk]
lcore_mask=0x3  
channel=2
promiscuous=1
numa_on=0
tcore_mask=0x3
port_list=0
mem_size=4096

[port0]
addr=192.168.1.3
netmask=255.255.255.0
broadcast=192.168.1.255
gateway=192.168.1.254
#addr6 = fe80::a8:6501:12f1:3eb9
#prefix6 = 64
#gateway6 = fe80::1

[log]
level = debug

Terminal output : Terminal

DPDK Status (dpdk-devbind.py --status):

Network devices using DPDK-compatible driver
============================================
0000:00:08.0 '82540EM Gigabit Ethernet Controller 100e' drv=uio_pci_generic unused=e1000

Network devices using kernel driver
===================================
0000:00:03.0 '82540EM Gigabit Ethernet Controller 100e' if=enp0s3 drv=e1000 unused=uio_pci_generic *Active*

No 'Baseband' devices detected
==============================

No 'Crypto' devices detected
============================

No 'DMA' devices detected
=========================

No 'Eventdev' devices detected
==============================

No 'Mempool' devices detected
=============================

No 'Compress' devices detected
==============================

No 'Misc (rawdev)' devices detected
===================================

No 'Regex' devices detected
===========================

Things I've Tried:

• Checked if the IP address and port are being used by another application.
• Reviewed the config.ini file settings for addr, netmask, and gateway.
• Verified the DPDK status to make sure the correct network card is being used.

Issue:

• The ff_recvfrom function fails, but the socket has been successfully created and bound.
• The IP address used is 192.168.1.3.
• The network card seems to be correctly set up.

Any help would be greatly appreciated!