1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 #include <network_helpers.h>
4
test_xdp_adjust_tail_shrink(void)5 static void test_xdp_adjust_tail_shrink(void)
6 {
7 const char *file = "./test_xdp_adjust_tail_shrink.bpf.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
test_xdp_adjust_tail_grow(void)40 static void test_xdp_adjust_tail_grow(void)
41 {
42 const char *file = "./test_xdp_adjust_tail_grow.bpf.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 topts.data_size_out = sizeof(buf);
67 err = bpf_prog_test_run_opts(prog_fd, &topts);
68 ASSERT_OK(err, "ipv6");
69 ASSERT_EQ(topts.retval, XDP_TX, "ipv6 retval");
70 ASSERT_EQ(topts.data_size_out, expect_sz, "ipv6 size");
71
72 bpf_object__close(obj);
73 }
74
test_xdp_adjust_tail_grow2(void)75 static void test_xdp_adjust_tail_grow2(void)
76 {
77 const char *file = "./test_xdp_adjust_tail_grow.bpf.o";
78 char buf[4096]; /* avoid segfault: large buf to hold grow results */
79 struct bpf_object *obj;
80 int err, cnt, i;
81 int max_grow, prog_fd;
82 /* SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) */
83 #if defined(__s390x__)
84 int tailroom = 512;
85 #else
86 int tailroom = 320;
87 #endif
88
89 LIBBPF_OPTS(bpf_test_run_opts, tattr,
90 .repeat = 1,
91 .data_in = &buf,
92 .data_out = &buf,
93 .data_size_in = 0, /* Per test */
94 .data_size_out = 0, /* Per test */
95 );
96
97 err = bpf_prog_test_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd);
98 if (!ASSERT_OK(err, "test_xdp_adjust_tail_grow"))
99 return;
100
101 /* Test case-64 */
102 memset(buf, 1, sizeof(buf));
103 tattr.data_size_in = 64; /* Determine test case via pkt size */
104 tattr.data_size_out = 128; /* Limit copy_size */
105 /* Kernel side alloc packet memory area that is zero init */
106 err = bpf_prog_test_run_opts(prog_fd, &tattr);
107
108 ASSERT_EQ(errno, ENOSPC, "case-64 errno"); /* Due limit copy_size in bpf_test_finish */
109 ASSERT_EQ(tattr.retval, XDP_TX, "case-64 retval");
110 ASSERT_EQ(tattr.data_size_out, 192, "case-64 data_size_out"); /* Expected grow size */
111
112 /* Extra checks for data contents */
113 ASSERT_EQ(buf[0], 1, "case-64-data buf[0]"); /* 0-63 memset to 1 */
114 ASSERT_EQ(buf[63], 1, "case-64-data buf[63]");
115 ASSERT_EQ(buf[64], 0, "case-64-data buf[64]"); /* 64-127 memset to 0 */
116 ASSERT_EQ(buf[127], 0, "case-64-data buf[127]");
117 ASSERT_EQ(buf[128], 1, "case-64-data buf[128]"); /* 128-191 memset to 1 */
118 ASSERT_EQ(buf[191], 1, "case-64-data buf[191]");
119
120 /* Test case-128 */
121 memset(buf, 2, sizeof(buf));
122 tattr.data_size_in = 128; /* Determine test case via pkt size */
123 tattr.data_size_out = sizeof(buf); /* Copy everything */
124 err = bpf_prog_test_run_opts(prog_fd, &tattr);
125
126 max_grow = 4096 - XDP_PACKET_HEADROOM - tailroom; /* 3520 */
127 ASSERT_OK(err, "case-128");
128 ASSERT_EQ(tattr.retval, XDP_TX, "case-128 retval");
129 ASSERT_EQ(tattr.data_size_out, max_grow, "case-128 data_size_out"); /* Expect max grow */
130
131 /* Extra checks for data content: Count grow size, will contain zeros */
132 for (i = 0, cnt = 0; i < sizeof(buf); i++) {
133 if (buf[i] == 0)
134 cnt++;
135 }
136 ASSERT_EQ(cnt, max_grow - tattr.data_size_in, "case-128-data cnt"); /* Grow increase */
137 ASSERT_EQ(tattr.data_size_out, max_grow, "case-128-data data_size_out"); /* Total grow */
138
139 bpf_object__close(obj);
140 }
141
test_xdp_adjust_frags_tail_shrink(void)142 static void test_xdp_adjust_frags_tail_shrink(void)
143 {
144 const char *file = "./test_xdp_adjust_tail_shrink.bpf.o";
145 __u32 exp_size;
146 struct bpf_program *prog;
147 struct bpf_object *obj;
148 int err, prog_fd;
149 __u8 *buf;
150 LIBBPF_OPTS(bpf_test_run_opts, topts);
151
152 /* For the individual test cases, the first byte in the packet
153 * indicates which test will be run.
154 */
155 obj = bpf_object__open(file);
156 if (libbpf_get_error(obj))
157 return;
158
159 prog = bpf_object__next_program(obj, NULL);
160 if (bpf_object__load(obj))
161 return;
162
163 prog_fd = bpf_program__fd(prog);
164
165 buf = malloc(9000);
166 if (!ASSERT_OK_PTR(buf, "alloc buf 9Kb"))
167 goto out;
168
169 memset(buf, 0, 9000);
170
171 /* Test case removing 10 bytes from last frag, NOT freeing it */
172 exp_size = 8990; /* 9000 - 10 */
173 topts.data_in = buf;
174 topts.data_out = buf;
175 topts.data_size_in = 9000;
176 topts.data_size_out = 9000;
177 err = bpf_prog_test_run_opts(prog_fd, &topts);
178
179 ASSERT_OK(err, "9Kb-10b");
180 ASSERT_EQ(topts.retval, XDP_TX, "9Kb-10b retval");
181 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-10b size");
182
183 /* Test case removing one of two pages, assuming 4K pages */
184 buf[0] = 1;
185 exp_size = 4900; /* 9000 - 4100 */
186
187 topts.data_size_out = 9000; /* reset from previous invocation */
188 err = bpf_prog_test_run_opts(prog_fd, &topts);
189
190 ASSERT_OK(err, "9Kb-4Kb");
191 ASSERT_EQ(topts.retval, XDP_TX, "9Kb-4Kb retval");
192 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-4Kb size");
193
194 /* Test case removing two pages resulting in a linear xdp_buff */
195 buf[0] = 2;
196 exp_size = 800; /* 9000 - 8200 */
197 topts.data_size_out = 9000; /* reset from previous invocation */
198 err = bpf_prog_test_run_opts(prog_fd, &topts);
199
200 ASSERT_OK(err, "9Kb-9Kb");
201 ASSERT_EQ(topts.retval, XDP_TX, "9Kb-9Kb retval");
202 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb-9Kb size");
203
204 free(buf);
205 out:
206 bpf_object__close(obj);
207 }
208
test_xdp_adjust_frags_tail_grow(void)209 static void test_xdp_adjust_frags_tail_grow(void)
210 {
211 const char *file = "./test_xdp_adjust_tail_grow.bpf.o";
212 __u32 exp_size;
213 struct bpf_program *prog;
214 struct bpf_object *obj;
215 int err, i, prog_fd;
216 __u8 *buf;
217 LIBBPF_OPTS(bpf_test_run_opts, topts);
218
219 obj = bpf_object__open(file);
220 if (libbpf_get_error(obj))
221 return;
222
223 prog = bpf_object__next_program(obj, NULL);
224 if (bpf_object__load(obj))
225 return;
226
227 prog_fd = bpf_program__fd(prog);
228
229 buf = malloc(16384);
230 if (!ASSERT_OK_PTR(buf, "alloc buf 16Kb"))
231 goto out;
232
233 /* Test case add 10 bytes to last frag */
234 memset(buf, 1, 16384);
235 exp_size = 9000 + 10;
236
237 topts.data_in = buf;
238 topts.data_out = buf;
239 topts.data_size_in = 9000;
240 topts.data_size_out = 16384;
241 err = bpf_prog_test_run_opts(prog_fd, &topts);
242
243 ASSERT_OK(err, "9Kb+10b");
244 ASSERT_EQ(topts.retval, XDP_TX, "9Kb+10b retval");
245 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb+10b size");
246
247 for (i = 0; i < 9000; i++)
248 ASSERT_EQ(buf[i], 1, "9Kb+10b-old");
249
250 for (i = 9000; i < 9010; i++)
251 ASSERT_EQ(buf[i], 0, "9Kb+10b-new");
252
253 for (i = 9010; i < 16384; i++)
254 ASSERT_EQ(buf[i], 1, "9Kb+10b-untouched");
255
256 /* Test a too large grow */
257 memset(buf, 1, 16384);
258 exp_size = 9001;
259
260 topts.data_in = topts.data_out = buf;
261 topts.data_size_in = 9001;
262 topts.data_size_out = 16384;
263 err = bpf_prog_test_run_opts(prog_fd, &topts);
264
265 ASSERT_OK(err, "9Kb+10b");
266 ASSERT_EQ(topts.retval, XDP_DROP, "9Kb+10b retval");
267 ASSERT_EQ(topts.data_size_out, exp_size, "9Kb+10b size");
268
269 free(buf);
270 out:
271 bpf_object__close(obj);
272 }
273
test_xdp_adjust_tail(void)274 void test_xdp_adjust_tail(void)
275 {
276 if (test__start_subtest("xdp_adjust_tail_shrink"))
277 test_xdp_adjust_tail_shrink();
278 if (test__start_subtest("xdp_adjust_tail_grow"))
279 test_xdp_adjust_tail_grow();
280 if (test__start_subtest("xdp_adjust_tail_grow2"))
281 test_xdp_adjust_tail_grow2();
282 if (test__start_subtest("xdp_adjust_frags_tail_shrink"))
283 test_xdp_adjust_frags_tail_shrink();
284 if (test__start_subtest("xdp_adjust_frags_tail_grow"))
285 test_xdp_adjust_frags_tail_grow();
286 }
287
