1*ae24bab2SLorenz Bauer // SPDX-License-Identifier: GPL-2.0
2*ae24bab2SLorenz Bauer #define _GNU_SOURCE
3*ae24bab2SLorenz Bauer #include <sched.h>
4*ae24bab2SLorenz Bauer #include <unistd.h>
5*ae24bab2SLorenz Bauer #include <stdio.h>
6*ae24bab2SLorenz Bauer #include <errno.h>
7*ae24bab2SLorenz Bauer #include <string.h>
8*ae24bab2SLorenz Bauer #include <stdlib.h>
9*ae24bab2SLorenz Bauer #include <stdint.h>
10*ae24bab2SLorenz Bauer #include <sys/types.h>
11*ae24bab2SLorenz Bauer #include <sys/socket.h>
12*ae24bab2SLorenz Bauer
13*ae24bab2SLorenz Bauer #ifndef SO_NETNS_COOKIE
14*ae24bab2SLorenz Bauer #define SO_NETNS_COOKIE 71
15*ae24bab2SLorenz Bauer #endif
16*ae24bab2SLorenz Bauer
17*ae24bab2SLorenz Bauer #define pr_err(fmt, ...) \
18*ae24bab2SLorenz Bauer ({ \
19*ae24bab2SLorenz Bauer fprintf(stderr, "%s:%d:" fmt ": %m\n", \
20*ae24bab2SLorenz Bauer __func__, __LINE__, ##__VA_ARGS__); \
21*ae24bab2SLorenz Bauer 1; \
22*ae24bab2SLorenz Bauer })
23*ae24bab2SLorenz Bauer
main(int argc,char * argvp[])24*ae24bab2SLorenz Bauer int main(int argc, char *argvp[])
25*ae24bab2SLorenz Bauer {
26*ae24bab2SLorenz Bauer uint64_t cookie1, cookie2;
27*ae24bab2SLorenz Bauer socklen_t vallen;
28*ae24bab2SLorenz Bauer int sock1, sock2;
29*ae24bab2SLorenz Bauer
30*ae24bab2SLorenz Bauer sock1 = socket(AF_INET, SOCK_STREAM, 0);
31*ae24bab2SLorenz Bauer if (sock1 < 0)
32*ae24bab2SLorenz Bauer return pr_err("Unable to create TCP socket");
33*ae24bab2SLorenz Bauer
34*ae24bab2SLorenz Bauer vallen = sizeof(cookie1);
35*ae24bab2SLorenz Bauer if (getsockopt(sock1, SOL_SOCKET, SO_NETNS_COOKIE, &cookie1, &vallen) != 0)
36*ae24bab2SLorenz Bauer return pr_err("getsockopt(SOL_SOCKET, SO_NETNS_COOKIE)");
37*ae24bab2SLorenz Bauer
38*ae24bab2SLorenz Bauer if (!cookie1)
39*ae24bab2SLorenz Bauer return pr_err("SO_NETNS_COOKIE returned zero cookie");
40*ae24bab2SLorenz Bauer
41*ae24bab2SLorenz Bauer if (unshare(CLONE_NEWNET))
42*ae24bab2SLorenz Bauer return pr_err("unshare");
43*ae24bab2SLorenz Bauer
44*ae24bab2SLorenz Bauer sock2 = socket(AF_INET, SOCK_STREAM, 0);
45*ae24bab2SLorenz Bauer if (sock2 < 0)
46*ae24bab2SLorenz Bauer return pr_err("Unable to create TCP socket");
47*ae24bab2SLorenz Bauer
48*ae24bab2SLorenz Bauer vallen = sizeof(cookie2);
49*ae24bab2SLorenz Bauer if (getsockopt(sock2, SOL_SOCKET, SO_NETNS_COOKIE, &cookie2, &vallen) != 0)
50*ae24bab2SLorenz Bauer return pr_err("getsockopt(SOL_SOCKET, SO_NETNS_COOKIE)");
51*ae24bab2SLorenz Bauer
52*ae24bab2SLorenz Bauer if (!cookie2)
53*ae24bab2SLorenz Bauer return pr_err("SO_NETNS_COOKIE returned zero cookie");
54*ae24bab2SLorenz Bauer
55*ae24bab2SLorenz Bauer if (cookie1 == cookie2)
56*ae24bab2SLorenz Bauer return pr_err("SO_NETNS_COOKIE returned identical cookies for distinct ns");
57*ae24bab2SLorenz Bauer
58*ae24bab2SLorenz Bauer close(sock1);
59*ae24bab2SLorenz Bauer close(sock2);
60*ae24bab2SLorenz Bauer return 0;
61*ae24bab2SLorenz Bauer }
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