43d2b88c29
Minimal selftest which implements a small BPF policy program to the connect(2) hook which rejects TCP connection requests to port 60123 with EPERM. This is being attached to a non-root cgroup v2 path. The test asserts that this works under cgroup v2-only and under a mixed cgroup v1/v2 environment where net_classid is set in the former case. Before fix: # ./test_progs -t cgroup_v1v2 test_cgroup_v1v2:PASS:server_fd 0 nsec test_cgroup_v1v2:PASS:client_fd 0 nsec test_cgroup_v1v2:PASS:cgroup_fd 0 nsec test_cgroup_v1v2:PASS:server_fd 0 nsec run_test:PASS:skel_open 0 nsec run_test:PASS:prog_attach 0 nsec test_cgroup_v1v2:PASS:cgroup-v2-only 0 nsec run_test:PASS:skel_open 0 nsec run_test:PASS:prog_attach 0 nsec run_test:PASS:join_classid 0 nsec (network_helpers.c:219: errno: None) Unexpected success to connect to server test_cgroup_v1v2:FAIL:cgroup-v1v2 unexpected error: -1 (errno 0) #27 cgroup_v1v2:FAIL Summary: 0/0 PASSED, 0 SKIPPED, 1 FAILED After fix: # ./test_progs -t cgroup_v1v2 #27 cgroup_v1v2:OK Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20210913230759.2313-3-daniel@iogearbox.net
80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <test_progs.h>
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#include "connect4_dropper.skel.h"
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#include "cgroup_helpers.h"
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#include "network_helpers.h"
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static int run_test(int cgroup_fd, int server_fd, bool classid)
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{
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struct network_helper_opts opts = {
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.must_fail = true,
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};
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struct connect4_dropper *skel;
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int fd, err = 0;
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skel = connect4_dropper__open_and_load();
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if (!ASSERT_OK_PTR(skel, "skel_open"))
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return -1;
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skel->links.connect_v4_dropper =
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bpf_program__attach_cgroup(skel->progs.connect_v4_dropper,
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cgroup_fd);
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if (!ASSERT_OK_PTR(skel->links.connect_v4_dropper, "prog_attach")) {
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err = -1;
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goto out;
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}
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if (classid && !ASSERT_OK(join_classid(), "join_classid")) {
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err = -1;
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goto out;
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}
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fd = connect_to_fd_opts(server_fd, &opts);
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if (fd < 0)
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err = -1;
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else
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close(fd);
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out:
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connect4_dropper__destroy(skel);
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return err;
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}
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void test_cgroup_v1v2(void)
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{
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struct network_helper_opts opts = {};
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int server_fd, client_fd, cgroup_fd;
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static const int port = 60123;
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/* Step 1: Check base connectivity works without any BPF. */
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server_fd = start_server(AF_INET, SOCK_STREAM, NULL, port, 0);
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if (!ASSERT_GE(server_fd, 0, "server_fd"))
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return;
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client_fd = connect_to_fd_opts(server_fd, &opts);
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if (!ASSERT_GE(client_fd, 0, "client_fd")) {
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close(server_fd);
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return;
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}
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close(client_fd);
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close(server_fd);
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/* Step 2: Check BPF policy prog attached to cgroups drops connectivity. */
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cgroup_fd = test__join_cgroup("/connect_dropper");
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if (!ASSERT_GE(cgroup_fd, 0, "cgroup_fd"))
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return;
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server_fd = start_server(AF_INET, SOCK_STREAM, NULL, port, 0);
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if (!ASSERT_GE(server_fd, 0, "server_fd")) {
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close(cgroup_fd);
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return;
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}
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ASSERT_OK(run_test(cgroup_fd, server_fd, false), "cgroup-v2-only");
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setup_classid_environment();
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set_classid(42);
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ASSERT_OK(run_test(cgroup_fd, server_fd, true), "cgroup-v1v2");
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cleanup_classid_environment();
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close(server_fd);
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close(cgroup_fd);
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}
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