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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Carlos Neira cneirabustos@gmail.com */
#define _GNU_SOURCE
#include <test_progs.h>
#include "test_ns_current_pid_tgid.skel.h"
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <sched.h>
#include <sys/wait.h>
#include <sys/mount.h>
#include <fcntl.h>
#include "network_helpers.h"
#define STACK_SIZE (1024 * 1024)
static char child_stack[STACK_SIZE];
static int get_pid_tgid(pid_t *pid, pid_t *tgid,
struct test_ns_current_pid_tgid__bss *bss)
{
struct stat st;
int err;
*pid = syscall(SYS_gettid);
*tgid = getpid();
err = stat("/proc/self/ns/pid", &st);
if (!ASSERT_OK(err, "stat /proc/self/ns/pid"))
return err;
bss->dev = st.st_dev;
bss->ino = st.st_ino;
bss->user_pid = 0;
bss->user_tgid = 0;
return 0;
}
static int test_current_pid_tgid_tp(void *args)
{
struct test_ns_current_pid_tgid__bss *bss;
struct test_ns_current_pid_tgid *skel;
int ret = -1, err;
pid_t tgid, pid;
skel = test_ns_current_pid_tgid__open();
if (!ASSERT_OK_PTR(skel, "test_ns_current_pid_tgid__open"))
return ret;
bpf_program__set_autoload(skel->progs.tp_handler, true);
err = test_ns_current_pid_tgid__load(skel);
if (!ASSERT_OK(err, "test_ns_current_pid_tgid__load"))
goto cleanup;
bss = skel->bss;
if (get_pid_tgid(&pid, &tgid, bss))
goto cleanup;
err = test_ns_current_pid_tgid__attach(skel);
if (!ASSERT_OK(err, "test_ns_current_pid_tgid__attach"))
goto cleanup;
/* trigger tracepoint */
usleep(1);
if (!ASSERT_EQ(bss->user_pid, pid, "pid"))
goto cleanup;
if (!ASSERT_EQ(bss->user_tgid, tgid, "tgid"))
goto cleanup;
ret = 0;
cleanup:
test_ns_current_pid_tgid__destroy(skel);
return ret;
}
static int test_current_pid_tgid_cgrp(void *args)
{
struct test_ns_current_pid_tgid__bss *bss;
struct test_ns_current_pid_tgid *skel;
int server_fd = -1, ret = -1, err;
int cgroup_fd = *(int *)args;
pid_t tgid, pid;
skel = test_ns_current_pid_tgid__open();
if (!ASSERT_OK_PTR(skel, "test_ns_current_pid_tgid__open"))
return ret;
bpf_program__set_autoload(skel->progs.cgroup_bind4, true);
err = test_ns_current_pid_tgid__load(skel);
if (!ASSERT_OK(err, "test_ns_current_pid_tgid__load"))
goto cleanup;
bss = skel->bss;
if (get_pid_tgid(&pid, &tgid, bss))
goto cleanup;
skel->links.cgroup_bind4 = bpf_program__attach_cgroup(
skel->progs.cgroup_bind4, cgroup_fd);
if (!ASSERT_OK_PTR(skel->links.cgroup_bind4, "bpf_program__attach_cgroup"))
goto cleanup;
server_fd = start_server(AF_INET, SOCK_STREAM, NULL, 0, 0);
if (!ASSERT_GE(server_fd, 0, "start_server"))
goto cleanup;
if (!ASSERT_EQ(bss->user_pid, pid, "pid"))
goto cleanup;
if (!ASSERT_EQ(bss->user_tgid, tgid, "tgid"))
goto cleanup;
ret = 0;
cleanup:
if (server_fd >= 0)
close(server_fd);
test_ns_current_pid_tgid__destroy(skel);
return ret;
}
static void test_ns_current_pid_tgid_new_ns(int (*fn)(void *), void *arg)
{
int wstatus;
pid_t cpid;
/* Create a process in a new namespace, this process
* will be the init process of this new namespace hence will be pid 1.
*/
cpid = clone(fn, child_stack + STACK_SIZE,
CLONE_NEWPID | SIGCHLD, arg);
if (!ASSERT_NEQ(cpid, -1, "clone"))
return;
if (!ASSERT_NEQ(waitpid(cpid, &wstatus, 0), -1, "waitpid"))
return;
if (!ASSERT_OK(WEXITSTATUS(wstatus), "newns_pidtgid"))
return;
}
static void test_in_netns(int (*fn)(void *), void *arg)
{
struct nstoken *nstoken = NULL;
SYS(cleanup, "ip netns add ns_current_pid_tgid");
SYS(cleanup, "ip -net ns_current_pid_tgid link set dev lo up");
nstoken = open_netns("ns_current_pid_tgid");
if (!ASSERT_OK_PTR(nstoken, "open_netns"))
goto cleanup;
test_ns_current_pid_tgid_new_ns(fn, arg);
cleanup:
if (nstoken)
close_netns(nstoken);
SYS_NOFAIL("ip netns del ns_current_pid_tgid");
}
/* TODO: use a different tracepoint */
void serial_test_ns_current_pid_tgid(void)
{
if (test__start_subtest("root_ns_tp"))
test_current_pid_tgid_tp(NULL);
if (test__start_subtest("new_ns_tp"))
test_ns_current_pid_tgid_new_ns(test_current_pid_tgid_tp, NULL);
if (test__start_subtest("new_ns_cgrp")) {
int cgroup_fd = -1;
cgroup_fd = test__join_cgroup("/sock_addr");
if (ASSERT_GE(cgroup_fd, 0, "join_cgroup")) {
test_in_netns(test_current_pid_tgid_cgrp, &cgroup_fd);
close(cgroup_fd);
}
}
}
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