1 // SPDX-License-Identifier: GPL-2.0 2 #include <test_progs.h> 3 #include <network_helpers.h> 4 #include "test_bpf_nf.skel.h" 5 #include "test_bpf_nf_fail.skel.h" 6 7 static char log_buf[1024 * 1024]; 8 9 struct { 10 const char *prog_name; 11 const char *err_msg; 12 } test_bpf_nf_fail_tests[] = { 13 { "alloc_release", "kernel function bpf_ct_release args#0 expected pointer to STRUCT nf_conn but" }, 14 { "insert_insert", "kernel function bpf_ct_insert_entry args#0 expected pointer to STRUCT nf_conn___init but" }, 15 { "lookup_insert", "kernel function bpf_ct_insert_entry args#0 expected pointer to STRUCT nf_conn___init but" }, 16 { "set_timeout_after_insert", "kernel function bpf_ct_set_timeout args#0 expected pointer to STRUCT nf_conn___init but" }, 17 { "set_status_after_insert", "kernel function bpf_ct_set_status args#0 expected pointer to STRUCT nf_conn___init but" }, 18 { "change_timeout_after_alloc", "kernel function bpf_ct_change_timeout args#0 expected pointer to STRUCT nf_conn but" }, 19 { "change_status_after_alloc", "kernel function bpf_ct_change_status args#0 expected pointer to STRUCT nf_conn but" }, 20 { "write_not_allowlisted_field", "no write support to nf_conn at off" }, 21 }; 22 23 enum { 24 TEST_XDP, 25 TEST_TC_BPF, 26 }; 27 28 #define TIMEOUT_MS 3000 29 30 static int connect_to_server(int srv_fd) 31 { 32 int fd = -1; 33 34 fd = socket(AF_INET, SOCK_STREAM, 0); 35 if (!ASSERT_GE(fd, 0, "socket")) 36 goto out; 37 38 if (!ASSERT_EQ(connect_fd_to_fd(fd, srv_fd, TIMEOUT_MS), 0, "connect_fd_to_fd")) { 39 close(fd); 40 fd = -1; 41 } 42 out: 43 return fd; 44 } 45 46 static void test_bpf_nf_ct(int mode) 47 { 48 const char *iptables = "iptables -t raw %s PREROUTING -j CONNMARK --set-mark 42/0"; 49 int srv_fd = -1, client_fd = -1, srv_client_fd = -1; 50 struct sockaddr_in peer_addr = {}; 51 struct test_bpf_nf *skel; 52 int prog_fd, err; 53 socklen_t len; 54 u16 srv_port; 55 char cmd[64]; 56 LIBBPF_OPTS(bpf_test_run_opts, topts, 57 .data_in = &pkt_v4, 58 .data_size_in = sizeof(pkt_v4), 59 .repeat = 1, 60 ); 61 62 skel = test_bpf_nf__open_and_load(); 63 if (!ASSERT_OK_PTR(skel, "test_bpf_nf__open_and_load")) 64 return; 65 66 /* Enable connection tracking */ 67 snprintf(cmd, sizeof(cmd), iptables, "-A"); 68 if (!ASSERT_OK(system(cmd), "iptables")) 69 goto end; 70 71 srv_port = (mode == TEST_XDP) ? 5005 : 5006; 72 srv_fd = start_server(AF_INET, SOCK_STREAM, "127.0.0.1", srv_port, TIMEOUT_MS); 73 if (!ASSERT_GE(srv_fd, 0, "start_server")) 74 goto end; 75 76 client_fd = connect_to_server(srv_fd); 77 if (!ASSERT_GE(client_fd, 0, "connect_to_server")) 78 goto end; 79 80 len = sizeof(peer_addr); 81 srv_client_fd = accept(srv_fd, (struct sockaddr *)&peer_addr, &len); 82 if (!ASSERT_GE(srv_client_fd, 0, "accept")) 83 goto end; 84 if (!ASSERT_EQ(len, sizeof(struct sockaddr_in), "sockaddr len")) 85 goto end; 86 87 skel->bss->saddr = peer_addr.sin_addr.s_addr; 88 skel->bss->sport = peer_addr.sin_port; 89 skel->bss->daddr = peer_addr.sin_addr.s_addr; 90 skel->bss->dport = htons(srv_port); 91 92 if (mode == TEST_XDP) 93 prog_fd = bpf_program__fd(skel->progs.nf_xdp_ct_test); 94 else 95 prog_fd = bpf_program__fd(skel->progs.nf_skb_ct_test); 96 97 err = bpf_prog_test_run_opts(prog_fd, &topts); 98 if (!ASSERT_OK(err, "bpf_prog_test_run")) 99 goto end; 100 101 ASSERT_EQ(skel->bss->test_einval_bpf_tuple, -EINVAL, "Test EINVAL for NULL bpf_tuple"); 102 ASSERT_EQ(skel->bss->test_einval_reserved, -EINVAL, "Test EINVAL for reserved not set to 0"); 103 ASSERT_EQ(skel->bss->test_einval_netns_id, -EINVAL, "Test EINVAL for netns_id < -1"); 104 ASSERT_EQ(skel->bss->test_einval_len_opts, -EINVAL, "Test EINVAL for len__opts != NF_BPF_CT_OPTS_SZ"); 105 ASSERT_EQ(skel->bss->test_eproto_l4proto, -EPROTO, "Test EPROTO for l4proto != TCP or UDP"); 106 ASSERT_EQ(skel->bss->test_enonet_netns_id, -ENONET, "Test ENONET for bad but valid netns_id"); 107 ASSERT_EQ(skel->bss->test_enoent_lookup, -ENOENT, "Test ENOENT for failed lookup"); 108 ASSERT_EQ(skel->bss->test_eafnosupport, -EAFNOSUPPORT, "Test EAFNOSUPPORT for invalid len__tuple"); 109 ASSERT_EQ(skel->data->test_alloc_entry, 0, "Test for alloc new entry"); 110 ASSERT_EQ(skel->data->test_insert_entry, 0, "Test for insert new entry"); 111 ASSERT_EQ(skel->data->test_succ_lookup, 0, "Test for successful lookup"); 112 /* allow some tolerance for test_delta_timeout value to avoid races. */ 113 ASSERT_GT(skel->bss->test_delta_timeout, 8, "Test for min ct timeout update"); 114 ASSERT_LE(skel->bss->test_delta_timeout, 10, "Test for max ct timeout update"); 115 /* expected status is IPS_SEEN_REPLY */ 116 ASSERT_EQ(skel->bss->test_status, 2, "Test for ct status update "); 117 ASSERT_EQ(skel->bss->test_insert_lookup_mark, 77, "Test for insert and lookup mark value"); 118 ASSERT_EQ(skel->data->test_exist_lookup, 0, "Test existing connection lookup"); 119 ASSERT_EQ(skel->bss->test_exist_lookup_mark, 43, "Test existing connection lookup ctmark"); 120 end: 121 if (srv_client_fd != -1) 122 close(srv_client_fd); 123 if (client_fd != -1) 124 close(client_fd); 125 if (srv_fd != -1) 126 close(srv_fd); 127 snprintf(cmd, sizeof(cmd), iptables, "-D"); 128 system(cmd); 129 test_bpf_nf__destroy(skel); 130 } 131 132 static void test_bpf_nf_ct_fail(const char *prog_name, const char *err_msg) 133 { 134 LIBBPF_OPTS(bpf_object_open_opts, opts, .kernel_log_buf = log_buf, 135 .kernel_log_size = sizeof(log_buf), 136 .kernel_log_level = 1); 137 struct test_bpf_nf_fail *skel; 138 struct bpf_program *prog; 139 int ret; 140 141 skel = test_bpf_nf_fail__open_opts(&opts); 142 if (!ASSERT_OK_PTR(skel, "test_bpf_nf_fail__open")) 143 return; 144 145 prog = bpf_object__find_program_by_name(skel->obj, prog_name); 146 if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name")) 147 goto end; 148 149 bpf_program__set_autoload(prog, true); 150 151 ret = test_bpf_nf_fail__load(skel); 152 if (!ASSERT_ERR(ret, "test_bpf_nf_fail__load must fail")) 153 goto end; 154 155 if (!ASSERT_OK_PTR(strstr(log_buf, err_msg), "expected error message")) { 156 fprintf(stderr, "Expected: %s\n", err_msg); 157 fprintf(stderr, "Verifier: %s\n", log_buf); 158 } 159 160 end: 161 test_bpf_nf_fail__destroy(skel); 162 } 163 164 void test_bpf_nf(void) 165 { 166 int i; 167 if (test__start_subtest("xdp-ct")) 168 test_bpf_nf_ct(TEST_XDP); 169 if (test__start_subtest("tc-bpf-ct")) 170 test_bpf_nf_ct(TEST_TC_BPF); 171 for (i = 0; i < ARRAY_SIZE(test_bpf_nf_fail_tests); i++) { 172 if (test__start_subtest(test_bpf_nf_fail_tests[i].prog_name)) 173 test_bpf_nf_ct_fail(test_bpf_nf_fail_tests[i].prog_name, 174 test_bpf_nf_fail_tests[i].err_msg); 175 } 176 } 177