1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 #include <network_helpers.h>
4 
5 static void test_xdp_adjust_tail_shrink(void)
6 {
7 	const char *file = "./test_xdp_adjust_tail_shrink.o";
8 	__u32 expect_sz;
9 	struct bpf_object *obj;
10 	int err, prog_fd;
11 	char buf[128];
12 	LIBBPF_OPTS(bpf_test_run_opts, topts,
13 		.data_in = &pkt_v4,
14 		.data_size_in = sizeof(pkt_v4),
15 		.data_out = buf,
16 		.data_size_out = sizeof(buf),
17 		.repeat = 1,
18 	);
19 
20 	err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd);
21 	if (ASSERT_OK(err, "test_xdp_adjust_tail_shrink"))
22 		return;
23 
24 	err = bpf_prog_test_run_opts(prog_fd, &topts);
25 	ASSERT_OK(err, "ipv4");
26 	ASSERT_EQ(topts.retval, XDP_DROP, "ipv4 retval");
27 
28 	expect_sz = sizeof(pkt_v6) - 20;  /* Test shrink with 20 bytes */
29 	topts.data_in = &pkt_v6;
30 	topts.data_size_in = sizeof(pkt_v6);
31 	topts.data_size_out = sizeof(buf);
32 	err = bpf_prog_test_run_opts(prog_fd, &topts);
33 	ASSERT_OK(err, "ipv6");
34 	ASSERT_EQ(topts.retval, XDP_TX, "ipv6 retval");
35 	ASSERT_EQ(topts.data_size_out, expect_sz, "ipv6 size");
36 
37 	bpf_object__close(obj);
38 }
39 
40 static void test_xdp_adjust_tail_grow(void)
41 {
42 	const char *file = "./test_xdp_adjust_tail_grow.o";
43 	struct bpf_object *obj;
44 	char buf[4096]; /* avoid segfault: large buf to hold grow results */
45 	__u32 expect_sz;
46 	int err, prog_fd;
47 	LIBBPF_OPTS(bpf_test_run_opts, topts,
48 		.data_in = &pkt_v4,
49 		.data_size_in = sizeof(pkt_v4),
50 		.data_out = buf,
51 		.data_size_out = sizeof(buf),
52 		.repeat = 1,
53 	);
54 
55 	err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd);
56 	if (ASSERT_OK(err, "test_xdp_adjust_tail_grow"))
57 		return;
58 
59 	err = bpf_prog_test_run_opts(prog_fd, &topts);
60 	ASSERT_OK(err, "ipv4");
61 	ASSERT_EQ(topts.retval, XDP_DROP, "ipv4 retval");
62 
63 	expect_sz = sizeof(pkt_v6) + 40; /* Test grow with 40 bytes */
64 	topts.data_in = &pkt_v6;
65 	topts.data_size_in = sizeof(pkt_v6);
66 	err = bpf_prog_test_run_opts(prog_fd, &topts);
67 	ASSERT_OK(err, "ipv6");
68 	ASSERT_EQ(topts.retval, XDP_TX, "ipv6 retval");
69 	ASSERT_EQ(topts.data_size_out, expect_sz, "ipv6 size");
70 
71 	bpf_object__close(obj);
72 }
73 
74 static void test_xdp_adjust_tail_grow2(void)
75 {
76 	const char *file = "./test_xdp_adjust_tail_grow.o";
77 	char buf[4096]; /* avoid segfault: large buf to hold grow results */
78 	int tailroom = 320; /* SKB_DATA_ALIGN(sizeof(struct skb_shared_info))*/;
79 	struct bpf_object *obj;
80 	int err, cnt, i;
81 	int max_grow, prog_fd;
82 
83 	LIBBPF_OPTS(bpf_test_run_opts, tattr,
84 		.repeat		= 1,
85 		.data_in	= &buf,
86 		.data_out	= &buf,
87 		.data_size_in	= 0, /* Per test */
88 		.data_size_out	= 0, /* Per test */
89 	);
90 
91 	err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd);
92 	if (ASSERT_OK(err, "test_xdp_adjust_tail_grow"))
93 		return;
94 
95 	/* Test case-64 */
96 	memset(buf, 1, sizeof(buf));
97 	tattr.data_size_in  =  64; /* Determine test case via pkt size */
98 	tattr.data_size_out = 128; /* Limit copy_size */
99 	/* Kernel side alloc packet memory area that is zero init */
100 	err = bpf_prog_test_run_opts(prog_fd, &tattr);
101 
102 	ASSERT_EQ(errno, ENOSPC, "case-64 errno"); /* Due limit copy_size in bpf_test_finish */
103 	ASSERT_EQ(tattr.retval, XDP_TX, "case-64 retval");
104 	ASSERT_EQ(tattr.data_size_out, 192, "case-64 data_size_out"); /* Expected grow size */
105 
106 	/* Extra checks for data contents */
107 	ASSERT_EQ(buf[0], 1, "case-64-data buf[0]"); /*  0-63  memset to 1 */
108 	ASSERT_EQ(buf[63], 1, "case-64-data buf[63]");
109 	ASSERT_EQ(buf[64], 0, "case-64-data buf[64]"); /* 64-127 memset to 0 */
110 	ASSERT_EQ(buf[127], 0, "case-64-data buf[127]");
111 	ASSERT_EQ(buf[128], 1, "case-64-data buf[128]"); /* 128-191 memset to 1 */
112 	ASSERT_EQ(buf[191], 1, "case-64-data buf[191]");
113 
114 	/* Test case-128 */
115 	memset(buf, 2, sizeof(buf));
116 	tattr.data_size_in  = 128; /* Determine test case via pkt size */
117 	tattr.data_size_out = sizeof(buf);   /* Copy everything */
118 	err = bpf_prog_test_run_opts(prog_fd, &tattr);
119 
120 	max_grow = 4096 - XDP_PACKET_HEADROOM -	tailroom; /* 3520 */
121 	ASSERT_OK(err, "case-128");
122 	ASSERT_EQ(tattr.retval, XDP_TX, "case-128 retval");
123 	ASSERT_EQ(tattr.data_size_out, max_grow, "case-128 data_size_out"); /* Expect max grow */
124 
125 	/* Extra checks for data content: Count grow size, will contain zeros */
126 	for (i = 0, cnt = 0; i < sizeof(buf); i++) {
127 		if (buf[i] == 0)
128 			cnt++;
129 	}
130 	ASSERT_EQ(cnt, max_grow - tattr.data_size_in, "case-128-data cnt"); /* Grow increase */
131 	ASSERT_EQ(tattr.data_size_out, max_grow, "case-128-data data_size_out"); /* Total grow */
132 
133 	bpf_object__close(obj);
134 }
135 
136 static void test_xdp_adjust_frags_tail_shrink(void)
137 {
138 	const char *file = "./test_xdp_adjust_tail_shrink.o";
139 	__u32 exp_size;
140 	struct bpf_program *prog;
141 	struct bpf_object *obj;
142 	int err, prog_fd;
143 	__u8 *buf;
144 	LIBBPF_OPTS(bpf_test_run_opts, topts);
145 
146 	/* For the individual test cases, the first byte in the packet
147 	 * indicates which test will be run.
148 	 */
149 	obj = bpf_object__open(file);
150 	if (libbpf_get_error(obj))
151 		return;
152 
153 	prog = bpf_object__next_program(obj, NULL);
154 	if (bpf_object__load(obj))
155 		return;
156 
157 	prog_fd = bpf_program__fd(prog);
158 
159 	buf = malloc(9000);
160 	if (!ASSERT_OK_PTR(buf, "alloc buf 9Kb"))
161 		goto out;
162 
163 	memset(buf, 0, 9000);
164 
165 	/* Test case removing 10 bytes from last frag, NOT freeing it */
166 	exp_size = 8990; /* 9000 - 10 */
167 	topts.data_in = buf;
168 	topts.data_out = buf;
169 	topts.data_size_in = 9000;
170 	topts.data_size_out = 9000;
171 	err = bpf_prog_test_run_opts(prog_fd, &topts);
172 
173 	ASSERT_OK(err, "9Kb-10b");
174 	ASSERT_EQ(topts.retval, XDP_TX, "9Kb-10b retval");
175 	ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-10b size");
176 
177 	/* Test case removing one of two pages, assuming 4K pages */
178 	buf[0] = 1;
179 	exp_size = 4900; /* 9000 - 4100 */
180 
181 	topts.data_size_out = 9000; /* reset from previous invocation */
182 	err = bpf_prog_test_run_opts(prog_fd, &topts);
183 
184 	ASSERT_OK(err, "9Kb-4Kb");
185 	ASSERT_EQ(topts.retval, XDP_TX, "9Kb-4Kb retval");
186 	ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-4Kb size");
187 
188 	/* Test case removing two pages resulting in a linear xdp_buff */
189 	buf[0] = 2;
190 	exp_size = 800; /* 9000 - 8200 */
191 	topts.data_size_out = 9000; /* reset from previous invocation */
192 	err = bpf_prog_test_run_opts(prog_fd, &topts);
193 
194 	ASSERT_OK(err, "9Kb-9Kb");
195 	ASSERT_EQ(topts.retval, XDP_TX, "9Kb-9Kb retval");
196 	ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-9Kb size");
197 
198 	free(buf);
199 out:
200 	bpf_object__close(obj);
201 }
202 
203 static void test_xdp_adjust_frags_tail_grow(void)
204 {
205 	const char *file = "./test_xdp_adjust_tail_grow.o";
206 	__u32 exp_size;
207 	struct bpf_program *prog;
208 	struct bpf_object *obj;
209 	int err, i, prog_fd;
210 	__u8 *buf;
211 	LIBBPF_OPTS(bpf_test_run_opts, topts);
212 
213 	obj = bpf_object__open(file);
214 	if (libbpf_get_error(obj))
215 		return;
216 
217 	prog = bpf_object__next_program(obj, NULL);
218 	if (bpf_object__load(obj))
219 		return;
220 
221 	prog_fd = bpf_program__fd(prog);
222 
223 	buf = malloc(16384);
224 	if (!ASSERT_OK_PTR(buf, "alloc buf 16Kb"))
225 		goto out;
226 
227 	/* Test case add 10 bytes to last frag */
228 	memset(buf, 1, 16384);
229 	exp_size = 9000 + 10;
230 
231 	topts.data_in = buf;
232 	topts.data_out = buf;
233 	topts.data_size_in = 9000;
234 	topts.data_size_out = 16384;
235 	err = bpf_prog_test_run_opts(prog_fd, &topts);
236 
237 	ASSERT_OK(err, "9Kb+10b");
238 	ASSERT_EQ(topts.retval, XDP_TX, "9Kb+10b retval");
239 	ASSERT_EQ(topts.data_size_out, exp_size, "9Kb+10b size");
240 
241 	for (i = 0; i < 9000; i++)
242 		ASSERT_EQ(buf[i], 1, "9Kb+10b-old");
243 
244 	for (i = 9000; i < 9010; i++)
245 		ASSERT_EQ(buf[i], 0, "9Kb+10b-new");
246 
247 	for (i = 9010; i < 16384; i++)
248 		ASSERT_EQ(buf[i], 1, "9Kb+10b-untouched");
249 
250 	/* Test a too large grow */
251 	memset(buf, 1, 16384);
252 	exp_size = 9001;
253 
254 	topts.data_in = topts.data_out = buf;
255 	topts.data_size_in = 9001;
256 	topts.data_size_out = 16384;
257 	err = bpf_prog_test_run_opts(prog_fd, &topts);
258 
259 	ASSERT_OK(err, "9Kb+10b");
260 	ASSERT_EQ(topts.retval, XDP_DROP, "9Kb+10b retval");
261 	ASSERT_EQ(topts.data_size_out, exp_size, "9Kb+10b size");
262 
263 	free(buf);
264 out:
265 	bpf_object__close(obj);
266 }
267 
268 void test_xdp_adjust_tail(void)
269 {
270 	if (test__start_subtest("xdp_adjust_tail_shrink"))
271 		test_xdp_adjust_tail_shrink();
272 	if (test__start_subtest("xdp_adjust_tail_grow"))
273 		test_xdp_adjust_tail_grow();
274 	if (test__start_subtest("xdp_adjust_tail_grow2"))
275 		test_xdp_adjust_tail_grow2();
276 	if (test__start_subtest("xdp_adjust_frags_tail_shrink"))
277 		test_xdp_adjust_frags_tail_shrink();
278 	if (test__start_subtest("xdp_adjust_frags_tail_grow"))
279 		test_xdp_adjust_frags_tail_grow();
280 }
281