// SPDX-License-Identifier: GPL-2.0
#include "test_progs.h"
#include "network_helpers.h"
#include "cgroup_helpers.h"
#include "cgroup_ancestor.skel.h"
#define CGROUP_PATH "/skb_cgroup_test"
#define TEST_NS "cgroup_ancestor_ns"
#define NUM_CGROUP_LEVELS 4
#define WAIT_AUTO_IP_MAX_ATTEMPT 10
#define DST_ADDR "::1"
#define DST_PORT 1234
#define MAX_ASSERT_NAME 32
struct test_data {
struct cgroup_ancestor *skel;
struct bpf_tc_hook qdisc;
struct bpf_tc_opts tc_attach;
struct nstoken *ns;
};
static int send_datagram(void)
{
unsigned char buf[] = "some random test data";
struct sockaddr_in6 addr = { .sin6_family = AF_INET6,
.sin6_port = htons(DST_PORT), };
int sock, n;
if (!ASSERT_EQ(inet_pton(AF_INET6, DST_ADDR, &addr.sin6_addr), 1,
"inet_pton"))
return -1;
sock = socket(AF_INET6, SOCK_DGRAM, 0);
if (!ASSERT_OK_FD(sock, "create socket"))
return sock;
if (!ASSERT_OK(connect(sock, &addr, sizeof(addr)), "connect")) {
close(sock);
return -1;
}
n = sendto(sock, buf, sizeof(buf), 0, (const struct sockaddr *)&addr,
sizeof(addr));
close(sock);
return ASSERT_EQ(n, sizeof(buf), "send data") ? 0 : -1;
}
static int setup_network(struct test_data *t)
{
SYS(fail, "ip netns add %s", TEST_NS);
t->ns = open_netns(TEST_NS);
if (!ASSERT_OK_PTR(t->ns, "open netns"))
goto cleanup_ns;
SYS(close_ns, "ip link set lo up");
memset(&t->qdisc, 0, sizeof(t->qdisc));
t->qdisc.sz = sizeof(t->qdisc);
t->qdisc.attach_point = BPF_TC_EGRESS;
t->qdisc.ifindex = if_nametoindex("lo");
if (!ASSERT_NEQ(t->qdisc.ifindex, 0, "if_nametoindex"))
goto close_ns;
if (!ASSERT_OK(bpf_tc_hook_create(&t->qdisc), "qdisc add"))
goto close_ns;
memset(&t->tc_attach, 0, sizeof(t->tc_attach));
t->tc_attach.sz = sizeof(t->tc_attach);
t->tc_attach.prog_fd = bpf_program__fd(t->skel->progs.log_cgroup_id);
if (!ASSERT_OK(bpf_tc_attach(&t->qdisc, &t->tc_attach), "filter add"))
goto cleanup_qdisc;
return 0;
cleanup_qdisc:
bpf_tc_hook_destroy(&t->qdisc);
close_ns:
close_netns(t->ns);
cleanup_ns:
SYS_NOFAIL("ip netns del %s", TEST_NS);
fail:
return 1;
}
static void cleanup_network(struct test_data *t)
{
bpf_tc_detach(&t->qdisc, &t->tc_attach);
bpf_tc_hook_destroy(&t->qdisc);
close_netns(t->ns);
SYS_NOFAIL("ip netns del %s", TEST_NS);
}
static void check_ancestors_ids(struct test_data *t)
{
__u64 expected_ids[NUM_CGROUP_LEVELS];
char assert_name[MAX_ASSERT_NAME];
__u32 level;
expected_ids[0] = get_cgroup_id("/.."); /* root cgroup */
expected_ids[1] = get_cgroup_id("");
expected_ids[2] = get_cgroup_id(CGROUP_PATH);
expected_ids[3] = 0; /* non-existent cgroup */
for (level = 0; level < NUM_CGROUP_LEVELS; level++) {
snprintf(assert_name, MAX_ASSERT_NAME,
"ancestor id at level %d", level);
ASSERT_EQ(t->skel->bss->cgroup_ids[level], expected_ids[level],
assert_name);
}
}
void test_cgroup_ancestor(void)
{
struct test_data t;
int cgroup_fd;
t.skel = cgroup_ancestor__open_and_load();
if (!ASSERT_OK_PTR(t.skel, "open and load"))
return;
t.skel->bss->dport = htons(DST_PORT);
cgroup_fd = cgroup_setup_and_join(CGROUP_PATH);
if (cgroup_fd < 0)
goto cleanup_progs;
if (setup_network(&t))
goto cleanup_cgroups;
if (send_datagram())
goto cleanup_network;
check_ancestors_ids(&t);
cleanup_network:
cleanup_network(&t);
cleanup_cgroups:
close(cgroup_fd);
cleanup_cgroup_environment();
cleanup_progs:
cgroup_ancestor__destroy(t.skel);
}