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* Regression Issue
@ 2023-05-08  7:33 Rai, Anjali
  2023-05-08  7:40 ` Greg KH
  0 siblings, 1 reply; 8+ messages in thread
From: Rai, Anjali @ 2023-05-08  7:33 UTC (permalink / raw)
  To: regressions@lists.linux.dev, stable@vger.kernel.org
  Cc: Gandhi, Jinen, Qin, Kailun


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Hi

We have one test which test the functionality of "using the same loopback address and port for both IPV6 and IPV4", The test should result in EADDRINUSE for binding IPv4 to same port, but it was successful

Test Description:
The test creates sockets for both IPv4 and IPv6, and forces IPV6 to listen for both IPV4 and IPV6 connections; this in turn makes binding another (IPV4) socket on the same port meaningless and results in -EADDRINUSE

Our systems had Kernel v6.0.9 and the test was successfully executing, we recently upgraded our systems to v6.2, and we saw this as a failure. The systems which are not upgraded, there it is still passing.

We don't exactly at which point this test broke, but our assumption is https://github.com/torvalds/linux/commit/28044fc1d4953b07acec0da4d2fc4784c57ea6fb

Can you please check on your end whether this is an actual regression of a feature request.

I have attached the cope snippet for the particular test as well as the url https://github.com/gramineproject/gramine/blob/master/libos/test/regression/tcp_ipv6_v6only.c

Thanks,
Anjali


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[-- Attachment #2: tcp_ipv6_v6only.c --]
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#define _DEFAULT_SOURCE
#include <arpa/inet.h>
#include <errno.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

/* use the same loopback address and port for both IPV6 and IPV4 */
#define SRV_IPV6 "::1/128"
#define SRV_IPV4 "127.0.0.1"
#define PORT     11112
#define TIMEOUT  5

int main(int argc, char** argv) {
    int socket_ipv4;
    int socket_ipv6;
    int ret;

    if ((socket_ipv6 = socket(AF_INET6, SOCK_STREAM, 0)) < 0) {
        perror("socket(ipv6)");
        return 1;
    }

    if ((socket_ipv4 = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("socket(ipv4)");
        return 1;
    }

    int enable = 1;
    if (setsockopt(socket_ipv6, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable)) < 0) {
        perror("setsockopt(ipv6, SO_REUSEADDR = 1)");
        return 1;
    }
    if (setsockopt(socket_ipv4, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable)) < 0) {
        perror("setsockopt(ipv4, SO_REUSEADDR = 1)");
        return 1;
    }

    /* this forces IPV6 to listen for both IPV4 and IPV6 connections; this in turn makes binding
     * another (IPV4) socket on the same port meaningless and results in -EADDRINUSE */
    int disable = 0;
    if (setsockopt(socket_ipv6, IPPROTO_IPV6, IPV6_V6ONLY, &disable, sizeof(disable)) < 0) {
        perror("setsockopt(IPV6_V6ONLY = 0)");
        return 1;
    }

    struct sockaddr_in6 address_ipv6;
    memset(&address_ipv6, 0, sizeof(address_ipv6));
    address_ipv6.sin6_family = AF_INET6;
    address_ipv6.sin6_port   = htons(PORT);

    if (inet_pton(AF_INET6, SRV_IPV6, &address_ipv6.sin6_addr) < 0) {
        perror("inet_pton(ipv6)");
        return 1;
    }

    if (bind(socket_ipv6, (struct sockaddr*)&address_ipv6, sizeof(address_ipv6)) < 0) {
        perror("bind(ipv6)");
        return 1;
    }

    /* we must start listening on IPV6 socket to make it active and kick in Linux rules for bind()
     */
    if (listen(socket_ipv6, 3) < 0) {
        perror("listen(ipv6)");
        return 1;
    }

    struct timeval tv = {.tv_sec = TIMEOUT};
    socklen_t optlen  = sizeof(tv);
    if (setsockopt(socket_ipv6, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) < 0) {
        perror("setsockopt(ipv6, SO_RCVTIMEO)");
        return 1;
    }
    if (setsockopt(socket_ipv6, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) < 0) {
        perror("setsockopt(ipv6, SO_SNDTIMEO)");
        return 1;
    }

    tv.tv_sec  = 0;
    tv.tv_usec = 0;
    if (getsockopt(socket_ipv6, SOL_SOCKET, SO_RCVTIMEO, &tv, &optlen) < 0) {
        perror("getsockopt(ipv6, SO_RCVTIMEO)");
        return 1;
    }
    if (tv.tv_sec != TIMEOUT || tv.tv_usec != 0 || optlen != sizeof(tv)) {
        fprintf(stderr, "getsockopt(ipv6, SO_RCVTIMEO) returned wrong value\n");
        return 1;
    }

    tv.tv_sec  = 0;
    tv.tv_usec = 0;
    optlen     = sizeof(tv);
    if (getsockopt(socket_ipv6, SOL_SOCKET, SO_SNDTIMEO, &tv, &optlen) < 0) {
        perror("getsockopt(ipv6, SO_SNDTIMEO)");
        return 1;
    }
    if (tv.tv_sec != TIMEOUT || tv.tv_usec != 0 || optlen != sizeof(tv)) {
        fprintf(stderr, "getsockopt(ipv6, SO_SNDTIMEO) returned wrong value\n");
        return 1;
    }

    struct sockaddr_in address_ipv4;
    memset(&address_ipv4, 0, sizeof(address_ipv4));
    address_ipv4.sin_family = AF_INET;
    address_ipv4.sin_port   = htons(PORT); /* note the same port! */

    if (inet_pton(AF_INET, SRV_IPV4, &address_ipv4.sin_addr) < 0) {
        perror("inet_pton(ipv4)");
        return 1;
    }

    ret = bind(socket_ipv4, (struct sockaddr*)&address_ipv4, sizeof(address_ipv4));
    if (ret != -1 || errno != EADDRINUSE) {
        fprintf(stderr,
                "bind(ipv4) was successful even though there is no IPV6_V6ONLY on same port\n");
        return 1;
    }

    if (setsockopt(socket_ipv6, SOL_SOCKET, SO_REUSEPORT, &enable, sizeof(enable)) < 0) {
        perror("setsockopt(ipv6, SO_REUSEPORT = 1)");
        return 1;
    }
    if (setsockopt(socket_ipv4, SOL_SOCKET, SO_REUSEPORT, &enable, sizeof(enable)) < 0) {
        perror("setsockopt(ipv4, SO_REUSEPORT = 1)");
        return 1;
    }

    if (bind(socket_ipv4, (struct sockaddr*)&address_ipv4, sizeof(address_ipv4)) < 0) {
        perror("bind(ipv4) failed even though SO_REUSEPORT has been called on both sockets");
        return 1;
    }

    puts("test completed successfully");
    return 0;
}

^ permalink raw reply	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2023-05-09  5:47 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-05-08  7:33 Regression Issue Rai, Anjali
2023-05-08  7:40 ` Greg KH
2023-05-08  7:52   ` Rai, Anjali
2023-05-08  8:27     ` Rai, Anjali
2023-05-08 19:31       ` Jakub Kicinski
2023-05-08 19:44         ` Kuniyuki Iwashima
2023-05-09  5:46           ` Rai, Anjali
2023-05-08  7:57   ` Linux regression tracking (Thorsten Leemhuis)

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