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tools/testing: add a selftest for SO_NETNS_COOKIE

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Make sure that SO_NETNS_COOKIE returns a non-zero value, and
that sockets from different namespaces have a distinct cookie
value.

Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lorenz Bauer 2021-06-23 15:56:46 +02:00 committed by David S. Miller
parent e8b9eab992
commit ae24bab257
4 changed files with 64 additions and 1 deletions
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1
tools/testing/selftests/net/.gitignore vendored
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@ -30,3 +30,4 @@ hwtstamp_config
rxtimestamp
timestamping
txtimestamp
so_netns_cookie

2
tools/testing/selftests/net/Makefile
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@ -30,7 +30,7 @@ TEST_GEN_FILES = socket nettest
TEST_GEN_FILES += psock_fanout psock_tpacket msg_zerocopy reuseport_addr_any
TEST_GEN_FILES += tcp_mmap tcp_inq psock_snd txring_overwrite
TEST_GEN_FILES += udpgso udpgso_bench_tx udpgso_bench_rx ip_defrag
TEST_GEN_FILES += so_txtime ipv6_flowlabel ipv6_flowlabel_mgr
TEST_GEN_FILES += so_txtime ipv6_flowlabel ipv6_flowlabel_mgr so_netns_cookie
TEST_GEN_FILES += tcp_fastopen_backup_key
TEST_GEN_FILES += fin_ack_lat
TEST_GEN_FILES += reuseaddr_ports_exhausted

1
tools/testing/selftests/net/config
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@ -1,4 +1,5 @@
CONFIG_USER_NS=y
CONFIG_NET_NS=y
CONFIG_BPF_SYSCALL=y
CONFIG_TEST_BPF=m
CONFIG_NUMA=y

61
tools/testing/selftests/net/so_netns_cookie.c Normal file
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@ -0,0 +1,61 @@
// 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;
}