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// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <sched.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/socket.h>
#ifndef SO_NETNS_COOKIE
#define SO_NETNS_COOKIE 71
#endif
#define pr_err(fmt, ...) \
({ \
fprintf(stderr, "%s:%d:" fmt ": %m\n", \
__func__, __LINE__, ##__VA_ARGS__); \
1; \
})
int main(int argc, char *argvp[])
{
uint64_t cookie1, cookie2;
socklen_t vallen;
int sock1, sock2;
sock1 = socket(AF_INET, SOCK_STREAM, 0);
if (sock1 < 0)
return pr_err("Unable to create TCP socket");
vallen = sizeof(cookie1);
if (getsockopt(sock1, SOL_SOCKET, SO_NETNS_COOKIE, &cookie1, &vallen) != 0)
return pr_err("getsockopt(SOL_SOCKET, SO_NETNS_COOKIE)");
if (!cookie1)
return pr_err("SO_NETNS_COOKIE returned zero cookie");
if (unshare(CLONE_NEWNET))
return pr_err("unshare");
sock2 = socket(AF_INET, SOCK_STREAM, 0);
if (sock2 < 0)
return pr_err("Unable to create TCP socket");
vallen = sizeof(cookie2);
if (getsockopt(sock2, SOL_SOCKET, SO_NETNS_COOKIE, &cookie2, &vallen) != 0)
return pr_err("getsockopt(SOL_SOCKET, SO_NETNS_COOKIE)");
if (!cookie2)
return pr_err("SO_NETNS_COOKIE returned zero cookie");
if (cookie1 == cookie2)
return pr_err("SO_NETNS_COOKIE returned identical cookies for distinct ns");
close(sock1);
close(sock2);
return 0;
}
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