Loading...
1// SPDX-License-Identifier: GPL-2.0
2
3#include <test_progs.h>
4
5#include "cgroup_helpers.h"
6
7#define PING_CMD "ping -q -c1 -w1 127.0.0.1 > /dev/null"
8
9static char bpf_log_buf[BPF_LOG_BUF_SIZE];
10
11static int map_fd = -1;
12
13static int prog_load_cnt(int verdict, int val)
14{
15 int cgroup_storage_fd, percpu_cgroup_storage_fd;
16
17 if (map_fd < 0)
18 map_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, 4, 8, 1, NULL);
19 if (map_fd < 0) {
20 printf("failed to create map '%s'\n", strerror(errno));
21 return -1;
22 }
23
24 cgroup_storage_fd = bpf_map_create(BPF_MAP_TYPE_CGROUP_STORAGE, NULL,
25 sizeof(struct bpf_cgroup_storage_key), 8, 0, NULL);
26 if (cgroup_storage_fd < 0) {
27 printf("failed to create map '%s'\n", strerror(errno));
28 return -1;
29 }
30
31 percpu_cgroup_storage_fd = bpf_map_create(
32 BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE, NULL,
33 sizeof(struct bpf_cgroup_storage_key), 8, 0, NULL);
34 if (percpu_cgroup_storage_fd < 0) {
35 printf("failed to create map '%s'\n", strerror(errno));
36 return -1;
37 }
38
39 struct bpf_insn prog[] = {
40 BPF_MOV32_IMM(BPF_REG_0, 0),
41 BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_0, -4), /* *(u32 *)(fp - 4) = r0 */
42 BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
43 BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4), /* r2 = fp - 4 */
44 BPF_LD_MAP_FD(BPF_REG_1, map_fd),
45 BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
46 BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
47 BPF_MOV64_IMM(BPF_REG_1, val), /* r1 = 1 */
48 BPF_ATOMIC_OP(BPF_DW, BPF_ADD, BPF_REG_0, BPF_REG_1, 0),
49
50 BPF_LD_MAP_FD(BPF_REG_1, cgroup_storage_fd),
51 BPF_MOV64_IMM(BPF_REG_2, 0),
52 BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_local_storage),
53 BPF_MOV64_IMM(BPF_REG_1, val),
54 BPF_ATOMIC_OP(BPF_W, BPF_ADD, BPF_REG_0, BPF_REG_1, 0),
55
56 BPF_LD_MAP_FD(BPF_REG_1, percpu_cgroup_storage_fd),
57 BPF_MOV64_IMM(BPF_REG_2, 0),
58 BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_local_storage),
59 BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_0, 0),
60 BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 0x1),
61 BPF_STX_MEM(BPF_W, BPF_REG_0, BPF_REG_3, 0),
62
63 BPF_MOV64_IMM(BPF_REG_0, verdict), /* r0 = verdict */
64 BPF_EXIT_INSN(),
65 };
66 size_t insns_cnt = ARRAY_SIZE(prog);
67 int ret;
68
69 ret = bpf_test_load_program(BPF_PROG_TYPE_CGROUP_SKB,
70 prog, insns_cnt, "GPL", 0,
71 bpf_log_buf, BPF_LOG_BUF_SIZE);
72
73 close(cgroup_storage_fd);
74 return ret;
75}
76
77void serial_test_cgroup_attach_multi(void)
78{
79 __u32 prog_ids[4], prog_cnt = 0, attach_flags, saved_prog_id;
80 int cg1 = 0, cg2 = 0, cg3 = 0, cg4 = 0, cg5 = 0, key = 0;
81 DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, attach_opts);
82 int allow_prog[7] = {-1};
83 unsigned long long value;
84 __u32 duration = 0;
85 int i = 0;
86
87 for (i = 0; i < ARRAY_SIZE(allow_prog); i++) {
88 allow_prog[i] = prog_load_cnt(1, 1 << i);
89 if (CHECK(allow_prog[i] < 0, "prog_load",
90 "verifier output:\n%s\n-------\n", bpf_log_buf))
91 goto err;
92 }
93
94 if (CHECK_FAIL(setup_cgroup_environment()))
95 goto err;
96
97 cg1 = create_and_get_cgroup("/cg1");
98 if (CHECK_FAIL(cg1 < 0))
99 goto err;
100 cg2 = create_and_get_cgroup("/cg1/cg2");
101 if (CHECK_FAIL(cg2 < 0))
102 goto err;
103 cg3 = create_and_get_cgroup("/cg1/cg2/cg3");
104 if (CHECK_FAIL(cg3 < 0))
105 goto err;
106 cg4 = create_and_get_cgroup("/cg1/cg2/cg3/cg4");
107 if (CHECK_FAIL(cg4 < 0))
108 goto err;
109 cg5 = create_and_get_cgroup("/cg1/cg2/cg3/cg4/cg5");
110 if (CHECK_FAIL(cg5 < 0))
111 goto err;
112
113 if (CHECK_FAIL(join_cgroup("/cg1/cg2/cg3/cg4/cg5")))
114 goto err;
115
116 if (CHECK(bpf_prog_attach(allow_prog[0], cg1, BPF_CGROUP_INET_EGRESS,
117 BPF_F_ALLOW_MULTI),
118 "prog0_attach_to_cg1_multi", "errno=%d\n", errno))
119 goto err;
120
121 if (CHECK(!bpf_prog_attach(allow_prog[0], cg1, BPF_CGROUP_INET_EGRESS,
122 BPF_F_ALLOW_MULTI),
123 "fail_same_prog_attach_to_cg1", "unexpected success\n"))
124 goto err;
125
126 if (CHECK(bpf_prog_attach(allow_prog[1], cg1, BPF_CGROUP_INET_EGRESS,
127 BPF_F_ALLOW_MULTI),
128 "prog1_attach_to_cg1_multi", "errno=%d\n", errno))
129 goto err;
130
131 if (CHECK(bpf_prog_attach(allow_prog[2], cg2, BPF_CGROUP_INET_EGRESS,
132 BPF_F_ALLOW_OVERRIDE),
133 "prog2_attach_to_cg2_override", "errno=%d\n", errno))
134 goto err;
135
136 if (CHECK(bpf_prog_attach(allow_prog[3], cg3, BPF_CGROUP_INET_EGRESS,
137 BPF_F_ALLOW_MULTI),
138 "prog3_attach_to_cg3_multi", "errno=%d\n", errno))
139 goto err;
140
141 if (CHECK(bpf_prog_attach(allow_prog[4], cg4, BPF_CGROUP_INET_EGRESS,
142 BPF_F_ALLOW_OVERRIDE),
143 "prog4_attach_to_cg4_override", "errno=%d\n", errno))
144 goto err;
145
146 if (CHECK(bpf_prog_attach(allow_prog[5], cg5, BPF_CGROUP_INET_EGRESS, 0),
147 "prog5_attach_to_cg5_none", "errno=%d\n", errno))
148 goto err;
149
150 CHECK_FAIL(system(PING_CMD));
151 CHECK_FAIL(bpf_map_lookup_elem(map_fd, &key, &value));
152 CHECK_FAIL(value != 1 + 2 + 8 + 32);
153
154 /* query the number of effective progs in cg5 */
155 CHECK_FAIL(bpf_prog_query(cg5, BPF_CGROUP_INET_EGRESS,
156 BPF_F_QUERY_EFFECTIVE, NULL, NULL, &prog_cnt));
157 CHECK_FAIL(prog_cnt != 4);
158 /* retrieve prog_ids of effective progs in cg5 */
159 CHECK_FAIL(bpf_prog_query(cg5, BPF_CGROUP_INET_EGRESS,
160 BPF_F_QUERY_EFFECTIVE, &attach_flags,
161 prog_ids, &prog_cnt));
162 CHECK_FAIL(prog_cnt != 4);
163 CHECK_FAIL(attach_flags != 0);
164 saved_prog_id = prog_ids[0];
165 /* check enospc handling */
166 prog_ids[0] = 0;
167 prog_cnt = 2;
168 CHECK_FAIL(bpf_prog_query(cg5, BPF_CGROUP_INET_EGRESS,
169 BPF_F_QUERY_EFFECTIVE, &attach_flags,
170 prog_ids, &prog_cnt) >= 0);
171 CHECK_FAIL(errno != ENOSPC);
172 CHECK_FAIL(prog_cnt != 4);
173 /* check that prog_ids are returned even when buffer is too small */
174 CHECK_FAIL(prog_ids[0] != saved_prog_id);
175 /* retrieve prog_id of single attached prog in cg5 */
176 prog_ids[0] = 0;
177 CHECK_FAIL(bpf_prog_query(cg5, BPF_CGROUP_INET_EGRESS, 0, NULL,
178 prog_ids, &prog_cnt));
179 CHECK_FAIL(prog_cnt != 1);
180 CHECK_FAIL(prog_ids[0] != saved_prog_id);
181
182 /* detach bottom program and ping again */
183 if (CHECK(bpf_prog_detach2(-1, cg5, BPF_CGROUP_INET_EGRESS),
184 "prog_detach_from_cg5", "errno=%d\n", errno))
185 goto err;
186
187 value = 0;
188 CHECK_FAIL(bpf_map_update_elem(map_fd, &key, &value, 0));
189 CHECK_FAIL(system(PING_CMD));
190 CHECK_FAIL(bpf_map_lookup_elem(map_fd, &key, &value));
191 CHECK_FAIL(value != 1 + 2 + 8 + 16);
192
193 /* test replace */
194
195 attach_opts.flags = BPF_F_ALLOW_OVERRIDE | BPF_F_REPLACE;
196 attach_opts.replace_prog_fd = allow_prog[0];
197 if (CHECK(!bpf_prog_attach_opts(allow_prog[6], cg1,
198 BPF_CGROUP_INET_EGRESS, &attach_opts),
199 "fail_prog_replace_override", "unexpected success\n"))
200 goto err;
201 CHECK_FAIL(errno != EINVAL);
202
203 attach_opts.flags = BPF_F_REPLACE;
204 if (CHECK(!bpf_prog_attach_opts(allow_prog[6], cg1,
205 BPF_CGROUP_INET_EGRESS, &attach_opts),
206 "fail_prog_replace_no_multi", "unexpected success\n"))
207 goto err;
208 CHECK_FAIL(errno != EINVAL);
209
210 attach_opts.flags = BPF_F_ALLOW_MULTI | BPF_F_REPLACE;
211 attach_opts.replace_prog_fd = -1;
212 if (CHECK(!bpf_prog_attach_opts(allow_prog[6], cg1,
213 BPF_CGROUP_INET_EGRESS, &attach_opts),
214 "fail_prog_replace_bad_fd", "unexpected success\n"))
215 goto err;
216 CHECK_FAIL(errno != EBADF);
217
218 /* replacing a program that is not attached to cgroup should fail */
219 attach_opts.replace_prog_fd = allow_prog[3];
220 if (CHECK(!bpf_prog_attach_opts(allow_prog[6], cg1,
221 BPF_CGROUP_INET_EGRESS, &attach_opts),
222 "fail_prog_replace_no_ent", "unexpected success\n"))
223 goto err;
224 CHECK_FAIL(errno != ENOENT);
225
226 /* replace 1st from the top program */
227 attach_opts.replace_prog_fd = allow_prog[0];
228 if (CHECK(bpf_prog_attach_opts(allow_prog[6], cg1,
229 BPF_CGROUP_INET_EGRESS, &attach_opts),
230 "prog_replace", "errno=%d\n", errno))
231 goto err;
232
233 /* replace program with itself */
234 attach_opts.replace_prog_fd = allow_prog[6];
235 if (CHECK(bpf_prog_attach_opts(allow_prog[6], cg1,
236 BPF_CGROUP_INET_EGRESS, &attach_opts),
237 "prog_replace", "errno=%d\n", errno))
238 goto err;
239
240 value = 0;
241 CHECK_FAIL(bpf_map_update_elem(map_fd, &key, &value, 0));
242 CHECK_FAIL(system(PING_CMD));
243 CHECK_FAIL(bpf_map_lookup_elem(map_fd, &key, &value));
244 CHECK_FAIL(value != 64 + 2 + 8 + 16);
245
246 /* detach 3rd from bottom program and ping again */
247 if (CHECK(!bpf_prog_detach2(0, cg3, BPF_CGROUP_INET_EGRESS),
248 "fail_prog_detach_from_cg3", "unexpected success\n"))
249 goto err;
250
251 if (CHECK(bpf_prog_detach2(allow_prog[3], cg3, BPF_CGROUP_INET_EGRESS),
252 "prog3_detach_from_cg3", "errno=%d\n", errno))
253 goto err;
254
255 value = 0;
256 CHECK_FAIL(bpf_map_update_elem(map_fd, &key, &value, 0));
257 CHECK_FAIL(system(PING_CMD));
258 CHECK_FAIL(bpf_map_lookup_elem(map_fd, &key, &value));
259 CHECK_FAIL(value != 64 + 2 + 16);
260
261 /* detach 2nd from bottom program and ping again */
262 if (CHECK(bpf_prog_detach2(-1, cg4, BPF_CGROUP_INET_EGRESS),
263 "prog_detach_from_cg4", "errno=%d\n", errno))
264 goto err;
265
266 value = 0;
267 CHECK_FAIL(bpf_map_update_elem(map_fd, &key, &value, 0));
268 CHECK_FAIL(system(PING_CMD));
269 CHECK_FAIL(bpf_map_lookup_elem(map_fd, &key, &value));
270 CHECK_FAIL(value != 64 + 2 + 4);
271
272 prog_cnt = 4;
273 CHECK_FAIL(bpf_prog_query(cg5, BPF_CGROUP_INET_EGRESS,
274 BPF_F_QUERY_EFFECTIVE, &attach_flags,
275 prog_ids, &prog_cnt));
276 CHECK_FAIL(prog_cnt != 3);
277 CHECK_FAIL(attach_flags != 0);
278 CHECK_FAIL(bpf_prog_query(cg5, BPF_CGROUP_INET_EGRESS, 0, NULL,
279 prog_ids, &prog_cnt));
280 CHECK_FAIL(prog_cnt != 0);
281
282err:
283 for (i = 0; i < ARRAY_SIZE(allow_prog); i++)
284 if (allow_prog[i] >= 0)
285 close(allow_prog[i]);
286 close(cg1);
287 close(cg2);
288 close(cg3);
289 close(cg4);
290 close(cg5);
291 cleanup_cgroup_environment();
292}