// SPDX-License-Identifier: GPL-2.0 #include #include #include #include "test_bpf_nf.skel.h" #include "test_bpf_nf_fail.skel.h" static char log_buf[1024 * 1024]; struct { const char *prog_name; const char *err_msg; } test_bpf_nf_fail_tests[] = { { "alloc_release", "kernel function bpf_ct_release args#0 expected pointer to STRUCT nf_conn but" }, { "insert_insert", "kernel function bpf_ct_insert_entry args#0 expected pointer to STRUCT nf_conn___init but" }, { "lookup_insert", "kernel function bpf_ct_insert_entry args#0 expected pointer to STRUCT nf_conn___init but" }, { "set_timeout_after_insert", "kernel function bpf_ct_set_timeout args#0 expected pointer to STRUCT nf_conn___init but" }, { "set_status_after_insert", "kernel function bpf_ct_set_status args#0 expected pointer to STRUCT nf_conn___init but" }, { "change_timeout_after_alloc", "kernel function bpf_ct_change_timeout args#0 expected pointer to STRUCT nf_conn but" }, { "change_status_after_alloc", "kernel function bpf_ct_change_status args#0 expected pointer to STRUCT nf_conn but" }, { "write_not_allowlisted_field", "no write support to nf_conn at off" }, }; enum { TEST_XDP, TEST_TC_BPF, }; #define TIMEOUT_MS 3000 #define IPS_STATUS_MASK (IPS_CONFIRMED | IPS_SEEN_REPLY | \ IPS_SRC_NAT_DONE | IPS_DST_NAT_DONE | \ IPS_SRC_NAT | IPS_DST_NAT) static int connect_to_server(int srv_fd) { int fd = -1; fd = socket(AF_INET, SOCK_STREAM, 0); if (!ASSERT_GE(fd, 0, "socket")) goto out; if (!ASSERT_EQ(connect_fd_to_fd(fd, srv_fd, TIMEOUT_MS), 0, "connect_fd_to_fd")) { close(fd); fd = -1; } out: return fd; } static void test_bpf_nf_ct(int mode) { const char *iptables = "iptables-legacy -t raw %s PREROUTING -j CONNMARK --set-mark 42/0"; int srv_fd = -1, client_fd = -1, srv_client_fd = -1; struct sockaddr_in peer_addr = {}; struct test_bpf_nf *skel; int prog_fd, err; socklen_t len; u16 srv_port; char cmd[128]; LIBBPF_OPTS(bpf_test_run_opts, topts, .data_in = &pkt_v4, .data_size_in = sizeof(pkt_v4), .repeat = 1, ); skel = test_bpf_nf__open_and_load(); if (!ASSERT_OK_PTR(skel, "test_bpf_nf__open_and_load")) return; /* Enable connection tracking */ snprintf(cmd, sizeof(cmd), iptables, "-A"); if (!ASSERT_OK(system(cmd), cmd)) goto end; srv_port = (mode == TEST_XDP) ? 5005 : 5006; srv_fd = start_server(AF_INET, SOCK_STREAM, "127.0.0.1", srv_port, TIMEOUT_MS); if (!ASSERT_GE(srv_fd, 0, "start_server")) goto end; client_fd = connect_to_server(srv_fd); if (!ASSERT_GE(client_fd, 0, "connect_to_server")) goto end; len = sizeof(peer_addr); srv_client_fd = accept(srv_fd, (struct sockaddr *)&peer_addr, &len); if (!ASSERT_GE(srv_client_fd, 0, "accept")) goto end; if (!ASSERT_EQ(len, sizeof(struct sockaddr_in), "sockaddr len")) goto end; skel->bss->saddr = peer_addr.sin_addr.s_addr; skel->bss->sport = peer_addr.sin_port; skel->bss->daddr = peer_addr.sin_addr.s_addr; skel->bss->dport = htons(srv_port); if (mode == TEST_XDP) prog_fd = bpf_program__fd(skel->progs.nf_xdp_ct_test); else prog_fd = bpf_program__fd(skel->progs.nf_skb_ct_test); err = bpf_prog_test_run_opts(prog_fd, &topts); if (!ASSERT_OK(err, "bpf_prog_test_run")) goto end; ASSERT_EQ(skel->bss->test_einval_bpf_tuple, -EINVAL, "Test EINVAL for NULL bpf_tuple"); ASSERT_EQ(skel->bss->test_einval_reserved, -EINVAL, "Test EINVAL for reserved not set to 0"); ASSERT_EQ(skel->bss->test_einval_netns_id, -EINVAL, "Test EINVAL for netns_id < -1"); ASSERT_EQ(skel->bss->test_einval_len_opts, -EINVAL, "Test EINVAL for len__opts != NF_BPF_CT_OPTS_SZ"); ASSERT_EQ(skel->bss->test_eproto_l4proto, -EPROTO, "Test EPROTO for l4proto != TCP or UDP"); ASSERT_EQ(skel->bss->test_enonet_netns_id, -ENONET, "Test ENONET for bad but valid netns_id"); ASSERT_EQ(skel->bss->test_enoent_lookup, -ENOENT, "Test ENOENT for failed lookup"); ASSERT_EQ(skel->bss->test_eafnosupport, -EAFNOSUPPORT, "Test EAFNOSUPPORT for invalid len__tuple"); ASSERT_EQ(skel->data->test_alloc_entry, 0, "Test for alloc new entry"); ASSERT_EQ(skel->data->test_insert_entry, 0, "Test for insert new entry"); ASSERT_EQ(skel->data->test_succ_lookup, 0, "Test for successful lookup"); /* allow some tolerance for test_delta_timeout value to avoid races. */ ASSERT_GT(skel->bss->test_delta_timeout, 8, "Test for min ct timeout update"); ASSERT_LE(skel->bss->test_delta_timeout, 10, "Test for max ct timeout update"); ASSERT_EQ(skel->bss->test_insert_lookup_mark, 77, "Test for insert and lookup mark value"); ASSERT_EQ(skel->bss->test_status, IPS_STATUS_MASK, "Test for ct status update "); ASSERT_EQ(skel->data->test_exist_lookup, 0, "Test existing connection lookup"); ASSERT_EQ(skel->bss->test_exist_lookup_mark, 43, "Test existing connection lookup ctmark"); ASSERT_EQ(skel->data->test_snat_addr, 0, "Test for source natting"); ASSERT_EQ(skel->data->test_dnat_addr, 0, "Test for destination natting"); end: if (srv_client_fd != -1) close(srv_client_fd); if (client_fd != -1) close(client_fd); if (srv_fd != -1) close(srv_fd); snprintf(cmd, sizeof(cmd), iptables, "-D"); system(cmd); test_bpf_nf__destroy(skel); } static void test_bpf_nf_ct_fail(const char *prog_name, const char *err_msg) { LIBBPF_OPTS(bpf_object_open_opts, opts, .kernel_log_buf = log_buf, .kernel_log_size = sizeof(log_buf), .kernel_log_level = 1); struct test_bpf_nf_fail *skel; struct bpf_program *prog; int ret; skel = test_bpf_nf_fail__open_opts(&opts); if (!ASSERT_OK_PTR(skel, "test_bpf_nf_fail__open")) return; prog = bpf_object__find_program_by_name(skel->obj, prog_name); if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name")) goto end; bpf_program__set_autoload(prog, true); ret = test_bpf_nf_fail__load(skel); if (!ASSERT_ERR(ret, "test_bpf_nf_fail__load must fail")) goto end; if (!ASSERT_OK_PTR(strstr(log_buf, err_msg), "expected error message")) { fprintf(stderr, "Expected: %s\n", err_msg); fprintf(stderr, "Verifier: %s\n", log_buf); } end: test_bpf_nf_fail__destroy(skel); } void test_bpf_nf(void) { int i; if (test__start_subtest("xdp-ct")) test_bpf_nf_ct(TEST_XDP); if (test__start_subtest("tc-bpf-ct")) test_bpf_nf_ct(TEST_TC_BPF); for (i = 0; i < ARRAY_SIZE(test_bpf_nf_fail_tests); i++) { if (test__start_subtest(test_bpf_nf_fail_tests[i].prog_name)) test_bpf_nf_ct_fail(test_bpf_nf_fail_tests[i].prog_name, test_bpf_nf_fail_tests[i].err_msg); } }