Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
8static char log_buf[1024 * 1024];
9
10struct {
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 { "lookup_null_bpf_tuple", "Possibly NULL pointer passed to trusted arg1" },
23 { "lookup_null_bpf_opts", "Possibly NULL pointer passed to trusted arg3" },
24 { "xdp_lookup_null_bpf_tuple", "Possibly NULL pointer passed to trusted arg1" },
25 { "xdp_lookup_null_bpf_opts", "Possibly NULL pointer passed to trusted arg3" },
26};
27
28enum {
29 TEST_XDP,
30 TEST_TC_BPF,
31};
32
33#define TIMEOUT_MS 3000
34#define IPS_STATUS_MASK (IPS_CONFIRMED | IPS_SEEN_REPLY | \
35 IPS_SRC_NAT_DONE | IPS_DST_NAT_DONE | \
36 IPS_SRC_NAT | IPS_DST_NAT)
37
38static int connect_to_server(int srv_fd)
39{
40 int fd = -1;
41
42 fd = socket(AF_INET, SOCK_STREAM, 0);
43 if (!ASSERT_GE(fd, 0, "socket"))
44 goto out;
45
46 if (!ASSERT_EQ(connect_fd_to_fd(fd, srv_fd, TIMEOUT_MS), 0, "connect_fd_to_fd")) {
47 close(fd);
48 fd = -1;
49 }
50out:
51 return fd;
52}
53
54static void test_bpf_nf_ct(int mode)
55{
56 const char *iptables = "iptables-legacy -t raw %s PREROUTING -j CONNMARK --set-mark 42/0";
57 int srv_fd = -1, client_fd = -1, srv_client_fd = -1;
58 struct sockaddr_in peer_addr = {};
59 struct test_bpf_nf *skel;
60 int prog_fd, err;
61 socklen_t len;
62 u16 srv_port;
63 char cmd[128];
64 LIBBPF_OPTS(bpf_test_run_opts, topts,
65 .data_in = &pkt_v4,
66 .data_size_in = sizeof(pkt_v4),
67 .repeat = 1,
68 );
69
70 if (SYS_NOFAIL("iptables-legacy --version")) {
71 fprintf(stdout, "Missing required iptables-legacy tool\n");
72 test__skip();
73 return;
74 }
75
76 skel = test_bpf_nf__open_and_load();
77 if (!ASSERT_OK_PTR(skel, "test_bpf_nf__open_and_load"))
78 return;
79
80 /* Enable connection tracking */
81 snprintf(cmd, sizeof(cmd), iptables, "-A");
82 if (!ASSERT_OK(system(cmd), cmd))
83 goto end;
84
85 srv_fd = start_server(AF_INET, SOCK_STREAM, "127.0.0.1", 0, TIMEOUT_MS);
86 if (!ASSERT_GE(srv_fd, 0, "start_server"))
87 goto end;
88
89 srv_port = get_socket_local_port(srv_fd);
90 if (!ASSERT_GE(srv_port, 0, "get_sock_local_port"))
91 goto end;
92
93 client_fd = connect_to_server(srv_fd);
94 if (!ASSERT_GE(client_fd, 0, "connect_to_server"))
95 goto end;
96
97 len = sizeof(peer_addr);
98 srv_client_fd = accept(srv_fd, (struct sockaddr *)&peer_addr, &len);
99 if (!ASSERT_GE(srv_client_fd, 0, "accept"))
100 goto end;
101 if (!ASSERT_EQ(len, sizeof(struct sockaddr_in), "sockaddr len"))
102 goto end;
103
104 skel->bss->saddr = peer_addr.sin_addr.s_addr;
105 skel->bss->sport = peer_addr.sin_port;
106 skel->bss->daddr = peer_addr.sin_addr.s_addr;
107 skel->bss->dport = srv_port;
108
109 if (mode == TEST_XDP)
110 prog_fd = bpf_program__fd(skel->progs.nf_xdp_ct_test);
111 else
112 prog_fd = bpf_program__fd(skel->progs.nf_skb_ct_test);
113
114 err = bpf_prog_test_run_opts(prog_fd, &topts);
115 if (!ASSERT_OK(err, "bpf_prog_test_run"))
116 goto end;
117
118 ASSERT_EQ(skel->bss->test_einval_reserved, -EINVAL, "Test EINVAL for reserved not set to 0");
119 ASSERT_EQ(skel->bss->test_einval_reserved_new, -EINVAL, "Test EINVAL for reserved in new struct not set to 0");
120 ASSERT_EQ(skel->bss->test_einval_netns_id, -EINVAL, "Test EINVAL for netns_id < -1");
121 ASSERT_EQ(skel->bss->test_einval_len_opts, -EINVAL, "Test EINVAL for len__opts != NF_BPF_CT_OPTS_SZ");
122 ASSERT_EQ(skel->bss->test_eproto_l4proto, -EPROTO, "Test EPROTO for l4proto != TCP or UDP");
123 ASSERT_EQ(skel->bss->test_enonet_netns_id, -ENONET, "Test ENONET for bad but valid netns_id");
124 ASSERT_EQ(skel->bss->test_enoent_lookup, -ENOENT, "Test ENOENT for failed lookup");
125 ASSERT_EQ(skel->bss->test_eafnosupport, -EAFNOSUPPORT, "Test EAFNOSUPPORT for invalid len__tuple");
126 ASSERT_EQ(skel->data->test_alloc_entry, 0, "Test for alloc new entry");
127 ASSERT_EQ(skel->data->test_insert_entry, 0, "Test for insert new entry");
128 ASSERT_EQ(skel->data->test_succ_lookup, 0, "Test for successful lookup");
129 /* allow some tolerance for test_delta_timeout value to avoid races. */
130 ASSERT_GT(skel->bss->test_delta_timeout, 8, "Test for min ct timeout update");
131 ASSERT_LE(skel->bss->test_delta_timeout, 10, "Test for max ct timeout update");
132 ASSERT_EQ(skel->bss->test_insert_lookup_mark, 77, "Test for insert and lookup mark value");
133 ASSERT_EQ(skel->bss->test_status, IPS_STATUS_MASK, "Test for ct status update ");
134 ASSERT_EQ(skel->data->test_exist_lookup, 0, "Test existing connection lookup");
135 ASSERT_EQ(skel->bss->test_exist_lookup_mark, 43, "Test existing connection lookup ctmark");
136 ASSERT_EQ(skel->data->test_snat_addr, 0, "Test for source natting");
137 ASSERT_EQ(skel->data->test_dnat_addr, 0, "Test for destination natting");
138 ASSERT_EQ(skel->data->test_ct_zone_id_alloc_entry, 0, "Test for alloc new entry in specified ct zone");
139 ASSERT_EQ(skel->data->test_ct_zone_id_insert_entry, 0, "Test for insert new entry in specified ct zone");
140 ASSERT_EQ(skel->data->test_ct_zone_id_succ_lookup, 0, "Test for successful lookup in specified ct_zone");
141 ASSERT_EQ(skel->bss->test_ct_zone_dir_enoent_lookup, -ENOENT, "Test ENOENT for lookup with wrong ct zone dir");
142 ASSERT_EQ(skel->bss->test_ct_zone_id_enoent_lookup, -ENOENT, "Test ENOENT for lookup in wrong ct zone");
143
144end:
145 if (client_fd != -1)
146 close(client_fd);
147 if (srv_client_fd != -1)
148 close(srv_client_fd);
149 if (srv_fd != -1)
150 close(srv_fd);
151
152 snprintf(cmd, sizeof(cmd), iptables, "-D");
153 system(cmd);
154 test_bpf_nf__destroy(skel);
155}
156
157static void test_bpf_nf_ct_fail(const char *prog_name, const char *err_msg)
158{
159 LIBBPF_OPTS(bpf_object_open_opts, opts, .kernel_log_buf = log_buf,
160 .kernel_log_size = sizeof(log_buf),
161 .kernel_log_level = 1);
162 struct test_bpf_nf_fail *skel;
163 struct bpf_program *prog;
164 int ret;
165
166 skel = test_bpf_nf_fail__open_opts(&opts);
167 if (!ASSERT_OK_PTR(skel, "test_bpf_nf_fail__open"))
168 return;
169
170 prog = bpf_object__find_program_by_name(skel->obj, prog_name);
171 if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
172 goto end;
173
174 bpf_program__set_autoload(prog, true);
175
176 ret = test_bpf_nf_fail__load(skel);
177 if (!ASSERT_ERR(ret, "test_bpf_nf_fail__load must fail"))
178 goto end;
179
180 if (!ASSERT_OK_PTR(strstr(log_buf, err_msg), "expected error message")) {
181 fprintf(stderr, "Expected: %s\n", err_msg);
182 fprintf(stderr, "Verifier: %s\n", log_buf);
183 }
184
185end:
186 test_bpf_nf_fail__destroy(skel);
187}
188
189void test_bpf_nf(void)
190{
191 int i;
192 if (test__start_subtest("xdp-ct"))
193 test_bpf_nf_ct(TEST_XDP);
194 if (test__start_subtest("tc-bpf-ct"))
195 test_bpf_nf_ct(TEST_TC_BPF);
196 for (i = 0; i < ARRAY_SIZE(test_bpf_nf_fail_tests); i++) {
197 if (test__start_subtest(test_bpf_nf_fail_tests[i].prog_name))
198 test_bpf_nf_ct_fail(test_bpf_nf_fail_tests[i].prog_name,
199 test_bpf_nf_fail_tests[i].err_msg);
200 }
201}