tools/testing/selftests/bpf/prog_tests/bpf_nf.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <test_progs.h>
   3 #include <network_helpers.h>
   4 #include <linux/netfilter/nf_conntrack_common.h>
   5 #include "test_bpf_nf.skel.h"
   6 #include "test_bpf_nf_fail.skel.h"
   7
   8 static char log_buf[1024 * 1024];
   9
  10 struct {
  11         const char *prog_name;
  12         const char *err_msg;
  13 } test_bpf_nf_fail_tests[] = {
  14         { "alloc_release", "kernel function bpf_ct_release args#0 expected pointer to STRUCT nf_conn but" },
  15         { "insert_insert", "kernel function bpf_ct_insert_entry args#0 expected pointer to STRUCT nf_conn___init but" },
  16         { "lookup_insert", "kernel function bpf_ct_insert_entry args#0 expected pointer to STRUCT nf_conn___init but" },
  17         { "set_timeout_after_insert", "kernel function bpf_ct_set_timeout args#0 expected pointer to STRUCT nf_conn___init but" },
  18         { "set_status_after_insert", "kernel function bpf_ct_set_status args#0 expected pointer to STRUCT nf_conn___init but" },
  19         { "change_timeout_after_alloc", "kernel function bpf_ct_change_timeout args#0 expected pointer to STRUCT nf_conn but" },
  20         { "change_status_after_alloc", "kernel function bpf_ct_change_status args#0 expected pointer to STRUCT nf_conn but" },
  21         { "write_not_allowlisted_field", "no write support to nf_conn at off" },
  22 };
  23
  24 enum {
  25         TEST_XDP,
  26         TEST_TC_BPF,
  27 };
  28
  29 #define TIMEOUT_MS              3000
  30 #define IPS_STATUS_MASK         (IPS_CONFIRMED | IPS_SEEN_REPLY | \
  31                                  IPS_SRC_NAT_DONE | IPS_DST_NAT_DONE | \
  32                                  IPS_SRC_NAT | IPS_DST_NAT)
  33
  34 static int connect_to_server(int srv_fd)
  35 {
  36         int fd = -1;
  37
  38         fd = socket(AF_INET, SOCK_STREAM, 0);
  39         if (!ASSERT_GE(fd, 0, "socket"))
  40                 goto out;
  41
  42         if (!ASSERT_EQ(connect_fd_to_fd(fd, srv_fd, TIMEOUT_MS), 0, "connect_fd_to_fd")) {
  43                 close(fd);
  44                 fd = -1;
  45         }
  46 out:
  47         return fd;
  48 }
  49
  50 static void test_bpf_nf_ct(int mode)
  51 {
  52         const char *iptables = "iptables-legacy -t raw %s PREROUTING -j CONNMARK --set-mark 42/0";
  53         int srv_fd = -1, client_fd = -1, srv_client_fd = -1;
  54         struct sockaddr_in peer_addr = {};
  55         struct test_bpf_nf *skel;
  56         int prog_fd, err;
  57         socklen_t len;
  58         u16 srv_port;
  59         char cmd[128];
  60         LIBBPF_OPTS(bpf_test_run_opts, topts,
  61                 .data_in = &pkt_v4,
  62                 .data_size_in = sizeof(pkt_v4),
  63                 .repeat = 1,
  64         );
  65
  66         skel = test_bpf_nf__open_and_load();
  67         if (!ASSERT_OK_PTR(skel, "test_bpf_nf__open_and_load"))
  68                 return;
  69
  70         /* Enable connection tracking */
  71         snprintf(cmd, sizeof(cmd), iptables, "-A");
  72         if (!ASSERT_OK(system(cmd), cmd))
  73                 goto end;
  74
  75         srv_port = (mode == TEST_XDP) ? 5005 : 5006;
  76         srv_fd = start_server(AF_INET, SOCK_STREAM, "127.0.0.1", srv_port, TIMEOUT_MS);
  77         if (!ASSERT_GE(srv_fd, 0, "start_server"))
  78                 goto end;
  79
  80         client_fd = connect_to_server(srv_fd);
  81         if (!ASSERT_GE(client_fd, 0, "connect_to_server"))
  82                 goto end;
  83
  84         len = sizeof(peer_addr);
  85         srv_client_fd = accept(srv_fd, (struct sockaddr *)&peer_addr, &len);
  86         if (!ASSERT_GE(srv_client_fd, 0, "accept"))
  87                 goto end;
  88         if (!ASSERT_EQ(len, sizeof(struct sockaddr_in), "sockaddr len"))
  89                 goto end;
  90
  91         skel->bss->saddr = peer_addr.sin_addr.s_addr;
  92         skel->bss->sport = peer_addr.sin_port;
  93         skel->bss->daddr = peer_addr.sin_addr.s_addr;
  94         skel->bss->dport = htons(srv_port);
  95
  96         if (mode == TEST_XDP)
  97                 prog_fd = bpf_program__fd(skel->progs.nf_xdp_ct_test);
  98         else
  99                 prog_fd = bpf_program__fd(skel->progs.nf_skb_ct_test);
 100
 101         err = bpf_prog_test_run_opts(prog_fd, &topts);
 102         if (!ASSERT_OK(err, "bpf_prog_test_run"))
 103                 goto end;
 104
 105         ASSERT_EQ(skel->bss->test_einval_bpf_tuple, -EINVAL, "Test EINVAL for NULL bpf_tuple");
 106         ASSERT_EQ(skel->bss->test_einval_reserved, -EINVAL, "Test EINVAL for reserved not set to 0");
 107         ASSERT_EQ(skel->bss->test_einval_netns_id, -EINVAL, "Test EINVAL for netns_id < -1");
 108         ASSERT_EQ(skel->bss->test_einval_len_opts, -EINVAL, "Test EINVAL for len__opts != NF_BPF_CT_OPTS_SZ");
 109         ASSERT_EQ(skel->bss->test_eproto_l4proto, -EPROTO, "Test EPROTO for l4proto != TCP or UDP");
 110         ASSERT_EQ(skel->bss->test_enonet_netns_id, -ENONET, "Test ENONET for bad but valid netns_id");
 111         ASSERT_EQ(skel->bss->test_enoent_lookup, -ENOENT, "Test ENOENT for failed lookup");
 112         ASSERT_EQ(skel->bss->test_eafnosupport, -EAFNOSUPPORT, "Test EAFNOSUPPORT for invalid len__tuple");
 113         ASSERT_EQ(skel->data->test_alloc_entry, 0, "Test for alloc new entry");
 114         ASSERT_EQ(skel->data->test_insert_entry, 0, "Test for insert new entry");
 115         ASSERT_EQ(skel->data->test_succ_lookup, 0, "Test for successful lookup");
 116         /* allow some tolerance for test_delta_timeout value to avoid races. */
 117         ASSERT_GT(skel->bss->test_delta_timeout, 8, "Test for min ct timeout update");
 118         ASSERT_LE(skel->bss->test_delta_timeout, 10, "Test for max ct timeout update");
 119         ASSERT_EQ(skel->bss->test_insert_lookup_mark, 77, "Test for insert and lookup mark value");
 120         ASSERT_EQ(skel->bss->test_status, IPS_STATUS_MASK, "Test for ct status update ");
 121         ASSERT_EQ(skel->data->test_exist_lookup, 0, "Test existing connection lookup");
 122         ASSERT_EQ(skel->bss->test_exist_lookup_mark, 43, "Test existing connection lookup ctmark");
 123         ASSERT_EQ(skel->data->test_snat_addr, 0, "Test for source natting");
 124         ASSERT_EQ(skel->data->test_dnat_addr, 0, "Test for destination natting");
 125 end:
 126         if (client_fd != -1)
 127                 close(client_fd);
 128         if (srv_client_fd != -1)
 129                 close(srv_client_fd);
 130         if (srv_fd != -1)
 131                 close(srv_fd);
 132
 133         snprintf(cmd, sizeof(cmd), iptables, "-D");
 134         system(cmd);
 135         test_bpf_nf__destroy(skel);
 136 }
 137
 138 static void test_bpf_nf_ct_fail(const char *prog_name, const char *err_msg)
 139 {
 140         LIBBPF_OPTS(bpf_object_open_opts, opts, .kernel_log_buf = log_buf,
 141                                                 .kernel_log_size = sizeof(log_buf),
 142                                                 .kernel_log_level = 1);
 143         struct test_bpf_nf_fail *skel;
 144         struct bpf_program *prog;
 145         int ret;
 146
 147         skel = test_bpf_nf_fail__open_opts(&opts);
 148         if (!ASSERT_OK_PTR(skel, "test_bpf_nf_fail__open"))
 149                 return;
 150
 151         prog = bpf_object__find_program_by_name(skel->obj, prog_name);
 152         if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
 153                 goto end;
 154
 155         bpf_program__set_autoload(prog, true);
 156
 157         ret = test_bpf_nf_fail__load(skel);
 158         if (!ASSERT_ERR(ret, "test_bpf_nf_fail__load must fail"))
 159                 goto end;
 160
 161         if (!ASSERT_OK_PTR(strstr(log_buf, err_msg), "expected error message")) {
 162                 fprintf(stderr, "Expected: %s\n", err_msg);
 163                 fprintf(stderr, "Verifier: %s\n", log_buf);
 164         }
 165
 166 end:
 167         test_bpf_nf_fail__destroy(skel);
 168 }
 169
 170 void test_bpf_nf(void)
 171 {
 172         int i;
 173         if (test__start_subtest("xdp-ct"))
 174                 test_bpf_nf_ct(TEST_XDP);
 175         if (test__start_subtest("tc-bpf-ct"))
 176                 test_bpf_nf_ct(TEST_TC_BPF);
 177         for (i = 0; i < ARRAY_SIZE(test_bpf_nf_fail_tests); i++) {
 178                 if (test__start_subtest(test_bpf_nf_fail_tests[i].prog_name))
 179                         test_bpf_nf_ct_fail(test_bpf_nf_fail_tests[i].prog_name,
 180                                             test_bpf_nf_fail_tests[i].err_msg);
 181         }
 182 }