[Bug 291613] Alpine Linux 3.22: linux: jid 74 pid 98353 (apk): unsupported setsockopt level 6 optname 31

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291613

Yuri Victorovich <yuri@freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |yuri@freebsd.org

--- Comment #2 from Yuri Victorovich <yuri@freebsd.org> ---
Level 6: Corresponds to the protocol level IPPROTO_TCP (or SOL_TCP), which is
the protocol number for the Transmission Control Protocol.

Optname 31: Corresponds to TCP_ULP (Upper Layer Protocol), a Linux-specific
socket option used to attach a specialized subsystem—such as Kernel TLS
(kTLS)—directly onto an active TCP connection. 

Example:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h> // Contains TCP_ULP definition on Linux

// Fallback definitions if compiling on older headers
#ifndef TCP_ULP
#define TCP_ULP 31
#endif

int main() {
    // 1. Create a standard TCP socket
    int sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock < 0) {
        perror("Failed to create socket");
        return EXIT_FAILURE;
    }

    // 2. Define the Upper Layer Protocol name (e.g., "tls")
    const char *ulp_name = "tls";

    // 3. Apply the ULP via setsockopt
    // Level 6 = IPPROTO_TCP (or SOL_TCP)
    // Optname 31 = TCP_ULP
    int result = setsockopt(sock, IPPROTO_TCP, TCP_ULP, ulp_name,
strlen(ulp_name) + 1);

    if (result < 0) {
        perror("Error setting TCP_ULP (Likely unsupported by your
environment/kernel)");
        close(sock);
        return EXIT_FAILURE;
    }

    printf("Successfully attached Upper Layer Protocol '%s' to the TCP
socket!\n", ulp_name);

    // Clean up
    close(sock);
    return EXIT_SUCCESS;
}

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