1 // SPDX-License-Identifier: GPL-2.0
2
3 #include <sys/types.h>
4 #include <sys/stat.h>
5 #include <unistd.h>
6 #include <test_progs.h>
7
get_map_id(struct bpf_object * obj,const char * name)8 __u32 get_map_id(struct bpf_object *obj, const char *name)
9 {
10 struct bpf_map_info map_info = {};
11 __u32 map_info_len, duration = 0;
12 struct bpf_map *map;
13 int err;
14
15 map_info_len = sizeof(map_info);
16
17 map = bpf_object__find_map_by_name(obj, name);
18 if (CHECK(!map, "find map", "NULL map"))
19 return 0;
20
21 err = bpf_map_get_info_by_fd(bpf_map__fd(map),
22 &map_info, &map_info_len);
23 CHECK(err, "get map info", "err %d errno %d", err, errno);
24 return map_info.id;
25 }
26
test_pinning(void)27 void test_pinning(void)
28 {
29 const char *file_invalid = "./test_pinning_invalid.bpf.o";
30 const char *custpinpath = "/sys/fs/bpf/custom/pinmap";
31 const char *nopinpath = "/sys/fs/bpf/nopinmap";
32 const char *nopinpath2 = "/sys/fs/bpf/nopinmap2";
33 const char *custpath = "/sys/fs/bpf/custom";
34 const char *pinpath = "/sys/fs/bpf/pinmap";
35 const char *file = "./test_pinning.bpf.o";
36 __u32 map_id, map_id2, duration = 0;
37 struct stat statbuf = {};
38 struct bpf_object *obj;
39 struct bpf_map *map;
40 int err, map_fd;
41 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts,
42 .pin_root_path = custpath,
43 );
44
45 /* check that opening fails with invalid pinning value in map def */
46 obj = bpf_object__open_file(file_invalid, NULL);
47 err = libbpf_get_error(obj);
48 if (CHECK(err != -EINVAL, "invalid open", "err %d errno %d\n", err, errno)) {
49 obj = NULL;
50 goto out;
51 }
52
53 /* open the valid object file */
54 obj = bpf_object__open_file(file, NULL);
55 err = libbpf_get_error(obj);
56 if (CHECK(err, "default open", "err %d errno %d\n", err, errno)) {
57 obj = NULL;
58 goto out;
59 }
60
61 err = bpf_object__load(obj);
62 if (CHECK(err, "default load", "err %d errno %d\n", err, errno))
63 goto out;
64
65 /* check that pinmap was pinned */
66 err = stat(pinpath, &statbuf);
67 if (CHECK(err, "stat pinpath", "err %d errno %d\n", err, errno))
68 goto out;
69
70 /* check that nopinmap was *not* pinned */
71 err = stat(nopinpath, &statbuf);
72 if (CHECK(!err || errno != ENOENT, "stat nopinpath",
73 "err %d errno %d\n", err, errno))
74 goto out;
75
76 /* check that nopinmap2 was *not* pinned */
77 err = stat(nopinpath2, &statbuf);
78 if (CHECK(!err || errno != ENOENT, "stat nopinpath2",
79 "err %d errno %d\n", err, errno))
80 goto out;
81
82 map_id = get_map_id(obj, "pinmap");
83 if (!map_id)
84 goto out;
85
86 bpf_object__close(obj);
87
88 obj = bpf_object__open_file(file, NULL);
89 if (CHECK_FAIL(libbpf_get_error(obj))) {
90 obj = NULL;
91 goto out;
92 }
93
94 err = bpf_object__load(obj);
95 if (CHECK(err, "default load", "err %d errno %d\n", err, errno))
96 goto out;
97
98 /* check that same map ID was reused for second load */
99 map_id2 = get_map_id(obj, "pinmap");
100 if (CHECK(map_id != map_id2, "check reuse",
101 "err %d errno %d id %d id2 %d\n", err, errno, map_id, map_id2))
102 goto out;
103
104 /* should be no-op to re-pin same map */
105 map = bpf_object__find_map_by_name(obj, "pinmap");
106 if (CHECK(!map, "find map", "NULL map"))
107 goto out;
108
109 err = bpf_map__pin(map, NULL);
110 if (CHECK(err, "re-pin map", "err %d errno %d\n", err, errno))
111 goto out;
112
113 /* but error to pin at different location */
114 err = bpf_map__pin(map, "/sys/fs/bpf/other");
115 if (CHECK(!err, "pin map different", "err %d errno %d\n", err, errno))
116 goto out;
117
118 /* unpin maps with a pin_path set */
119 err = bpf_object__unpin_maps(obj, NULL);
120 if (CHECK(err, "unpin maps", "err %d errno %d\n", err, errno))
121 goto out;
122
123 /* and re-pin them... */
124 err = bpf_object__pin_maps(obj, NULL);
125 if (CHECK(err, "pin maps", "err %d errno %d\n", err, errno))
126 goto out;
127
128 /* get pinning path */
129 if (!ASSERT_STREQ(bpf_map__pin_path(map), pinpath, "get pin path"))
130 goto out;
131
132 /* set pinning path of other map and re-pin all */
133 map = bpf_object__find_map_by_name(obj, "nopinmap");
134 if (CHECK(!map, "find map", "NULL map"))
135 goto out;
136
137 err = bpf_map__set_pin_path(map, custpinpath);
138 if (CHECK(err, "set pin path", "err %d errno %d\n", err, errno))
139 goto out;
140
141 /* get pinning path after set */
142 if (!ASSERT_STREQ(bpf_map__pin_path(map), custpinpath,
143 "get pin path after set"))
144 goto out;
145
146 /* should only pin the one unpinned map */
147 err = bpf_object__pin_maps(obj, NULL);
148 if (CHECK(err, "pin maps", "err %d errno %d\n", err, errno))
149 goto out;
150
151 /* check that nopinmap was pinned at the custom path */
152 err = stat(custpinpath, &statbuf);
153 if (CHECK(err, "stat custpinpath", "err %d errno %d\n", err, errno))
154 goto out;
155
156 /* remove the custom pin path to re-test it with auto-pinning below */
157 err = unlink(custpinpath);
158 if (CHECK(err, "unlink custpinpath", "err %d errno %d\n", err, errno))
159 goto out;
160
161 err = rmdir(custpath);
162 if (CHECK(err, "rmdir custpindir", "err %d errno %d\n", err, errno))
163 goto out;
164
165 bpf_object__close(obj);
166
167 /* open the valid object file again */
168 obj = bpf_object__open_file(file, NULL);
169 err = libbpf_get_error(obj);
170 if (CHECK(err, "default open", "err %d errno %d\n", err, errno)) {
171 obj = NULL;
172 goto out;
173 }
174
175 /* set pin paths so that nopinmap2 will attempt to reuse the map at
176 * pinpath (which will fail), but not before pinmap has already been
177 * reused
178 */
179 bpf_object__for_each_map(map, obj) {
180 if (!strcmp(bpf_map__name(map), "nopinmap"))
181 err = bpf_map__set_pin_path(map, nopinpath2);
182 else if (!strcmp(bpf_map__name(map), "nopinmap2"))
183 err = bpf_map__set_pin_path(map, pinpath);
184 else
185 continue;
186
187 if (CHECK(err, "set pin path", "err %d errno %d\n", err, errno))
188 goto out;
189 }
190
191 /* should fail because of map parameter mismatch */
192 err = bpf_object__load(obj);
193 if (CHECK(err != -EINVAL, "param mismatch load", "err %d errno %d\n", err, errno))
194 goto out;
195
196 /* nopinmap2 should have been pinned and cleaned up again */
197 err = stat(nopinpath2, &statbuf);
198 if (CHECK(!err || errno != ENOENT, "stat nopinpath2",
199 "err %d errno %d\n", err, errno))
200 goto out;
201
202 /* pinmap should still be there */
203 err = stat(pinpath, &statbuf);
204 if (CHECK(err, "stat pinpath", "err %d errno %d\n", err, errno))
205 goto out;
206
207 bpf_object__close(obj);
208
209 /* test auto-pinning at custom path with open opt */
210 obj = bpf_object__open_file(file, &opts);
211 if (CHECK_FAIL(libbpf_get_error(obj))) {
212 obj = NULL;
213 goto out;
214 }
215
216 err = bpf_object__load(obj);
217 if (CHECK(err, "custom load", "err %d errno %d\n", err, errno))
218 goto out;
219
220 /* check that pinmap was pinned at the custom path */
221 err = stat(custpinpath, &statbuf);
222 if (CHECK(err, "stat custpinpath", "err %d errno %d\n", err, errno))
223 goto out;
224
225 /* remove the custom pin path to re-test it with reuse fd below */
226 err = unlink(custpinpath);
227 if (CHECK(err, "unlink custpinpath", "err %d errno %d\n", err, errno))
228 goto out;
229
230 err = rmdir(custpath);
231 if (CHECK(err, "rmdir custpindir", "err %d errno %d\n", err, errno))
232 goto out;
233
234 bpf_object__close(obj);
235
236 /* test pinning at custom path with reuse fd */
237 obj = bpf_object__open_file(file, NULL);
238 err = libbpf_get_error(obj);
239 if (CHECK(err, "default open", "err %d errno %d\n", err, errno)) {
240 obj = NULL;
241 goto out;
242 }
243
244 map_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL, sizeof(__u32),
245 sizeof(__u64), 1, NULL);
246 if (CHECK(map_fd < 0, "create pinmap manually", "fd %d\n", map_fd))
247 goto out;
248
249 map = bpf_object__find_map_by_name(obj, "pinmap");
250 if (CHECK(!map, "find map", "NULL map"))
251 goto close_map_fd;
252
253 err = bpf_map__reuse_fd(map, map_fd);
254 if (CHECK(err, "reuse pinmap fd", "err %d errno %d\n", err, errno))
255 goto close_map_fd;
256
257 err = bpf_map__set_pin_path(map, custpinpath);
258 if (CHECK(err, "set pin path", "err %d errno %d\n", err, errno))
259 goto close_map_fd;
260
261 err = bpf_object__load(obj);
262 if (CHECK(err, "custom load", "err %d errno %d\n", err, errno))
263 goto close_map_fd;
264
265 /* check that pinmap was pinned at the custom path */
266 err = stat(custpinpath, &statbuf);
267 if (CHECK(err, "stat custpinpath", "err %d errno %d\n", err, errno))
268 goto close_map_fd;
269
270 close_map_fd:
271 close(map_fd);
272 out:
273 unlink(pinpath);
274 unlink(nopinpath);
275 unlink(nopinpath2);
276 unlink(custpinpath);
277 rmdir(custpath);
278 if (obj)
279 bpf_object__close(obj);
280 }
281