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