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