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Commit | Line | Data |
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6054c1eb | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
0dc34c77 EB |
2 | #define _ATFILE_SOURCE |
3 | #include <sys/types.h> | |
4 | #include <sys/stat.h> | |
5 | #include <sys/wait.h> | |
6 | #include <sys/inotify.h> | |
7 | #include <sys/mount.h> | |
0dc34c77 EB |
8 | #include <sys/syscall.h> |
9 | #include <stdio.h> | |
10 | #include <string.h> | |
11 | #include <sched.h> | |
12 | #include <fcntl.h> | |
13 | #include <dirent.h> | |
14 | #include <errno.h> | |
15 | #include <unistd.h> | |
9a7b3d91 | 16 | #include <ctype.h> |
d652ccbf | 17 | #include <linux/limits.h> |
0dc34c77 | 18 | |
d182ee13 ND |
19 | #include <linux/net_namespace.h> |
20 | ||
0dc34c77 | 21 | #include "utils.h" |
4952b459 | 22 | #include "list.h" |
0dc34c77 | 23 | #include "ip_common.h" |
eb67e449 | 24 | #include "namespace.h" |
e93d9221 | 25 | #include "json_print.h" |
0dc34c77 | 26 | |
8e2d47dc | 27 | static int usage(void) |
0dc34c77 | 28 | { |
8589eb4e MC |
29 | fprintf(stderr, |
30 | "Usage: ip netns list\n" | |
31 | " ip netns add NAME\n" | |
32 | " ip netns attach NAME PID\n" | |
33 | " ip netns set NAME NETNSID\n" | |
34 | " ip [-all] netns delete [NAME]\n" | |
35 | " ip netns identify [PID]\n" | |
36 | " ip netns pids NAME\n" | |
37 | " ip [-all] netns exec [NAME] cmd ...\n" | |
38 | " ip netns monitor\n" | |
eaefb078 | 39 | " ip netns list-id [target-nsid POSITIVE-INT] [nsid POSITIVE-INT]\n" |
8589eb4e | 40 | "NETNSID := auto | POSITIVE-INT\n"); |
a05f6511 | 41 | exit(-1); |
0dc34c77 EB |
42 | } |
43 | ||
d652ccbf ND |
44 | /* This socket is used to get nsid */ |
45 | static struct rtnl_handle rtnsh = { .fd = -1 }; | |
46 | ||
4c7d9a58 | 47 | static int have_rtnl_getnsid = -1; |
b2e29223 | 48 | static int saved_netns = -1; |
eaefb078 | 49 | static struct link_filter filter; |
4c7d9a58 | 50 | |
cd554f2c | 51 | static int ipnetns_accept_msg(struct rtnl_ctrl_data *ctrl, |
4c7d9a58 ND |
52 | struct nlmsghdr *n, void *arg) |
53 | { | |
54 | struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(n); | |
55 | ||
56 | if (n->nlmsg_type == NLMSG_ERROR && | |
57 | (err->error == -EOPNOTSUPP || err->error == -EINVAL)) | |
58 | have_rtnl_getnsid = 0; | |
59 | else | |
60 | have_rtnl_getnsid = 1; | |
61 | return -1; | |
62 | } | |
63 | ||
64 | static int ipnetns_have_nsid(void) | |
65 | { | |
66 | struct { | |
67 | struct nlmsghdr n; | |
68 | struct rtgenmsg g; | |
69 | char buf[1024]; | |
d17b136f PS |
70 | } req = { |
71 | .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg)), | |
72 | .n.nlmsg_flags = NLM_F_REQUEST, | |
73 | .n.nlmsg_type = RTM_GETNSID, | |
74 | .g.rtgen_family = AF_UNSPEC, | |
75 | }; | |
4c7d9a58 ND |
76 | int fd; |
77 | ||
78 | if (have_rtnl_getnsid < 0) { | |
4c7d9a58 ND |
79 | fd = open("/proc/self/ns/net", O_RDONLY); |
80 | if (fd < 0) { | |
c44003f7 LZ |
81 | have_rtnl_getnsid = 0; |
82 | return 0; | |
4c7d9a58 ND |
83 | } |
84 | ||
85 | addattr32(&req.n, 1024, NETNSA_FD, fd); | |
86 | ||
87 | if (rtnl_send(&rth, &req.n, req.n.nlmsg_len) < 0) { | |
88 | perror("request send failed"); | |
89 | exit(1); | |
90 | } | |
91 | rtnl_listen(&rth, ipnetns_accept_msg, NULL); | |
92 | close(fd); | |
93 | } | |
94 | ||
95 | return have_rtnl_getnsid; | |
96 | } | |
97 | ||
974ef93b | 98 | int get_netnsid_from_name(const char *name) |
d182ee13 ND |
99 | { |
100 | struct { | |
101 | struct nlmsghdr n; | |
102 | struct rtgenmsg g; | |
103 | char buf[1024]; | |
86bf43c7 | 104 | } req = { |
d17b136f PS |
105 | .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg)), |
106 | .n.nlmsg_flags = NLM_F_REQUEST, | |
107 | .n.nlmsg_type = RTM_GETNSID, | |
108 | .g.rtgen_family = AF_UNSPEC, | |
109 | }; | |
86bf43c7 | 110 | struct nlmsghdr *answer; |
d182ee13 ND |
111 | struct rtattr *tb[NETNSA_MAX + 1]; |
112 | struct rtgenmsg *rthdr; | |
9bf2c538 | 113 | int len, fd, ret = -1; |
d182ee13 | 114 | |
974ef93b ND |
115 | netns_nsid_socket_init(); |
116 | ||
d182ee13 ND |
117 | fd = netns_get_fd(name); |
118 | if (fd < 0) | |
119 | return fd; | |
120 | ||
121 | addattr32(&req.n, 1024, NETNSA_FD, fd); | |
86bf43c7 | 122 | if (rtnl_talk(&rtnsh, &req.n, &answer) < 0) { |
d182ee13 ND |
123 | close(fd); |
124 | return -2; | |
125 | } | |
126 | close(fd); | |
127 | ||
128 | /* Validate message and parse attributes */ | |
86bf43c7 | 129 | if (answer->nlmsg_type == NLMSG_ERROR) |
9bf2c538 | 130 | goto out; |
d182ee13 | 131 | |
86bf43c7 HL |
132 | rthdr = NLMSG_DATA(answer); |
133 | len = answer->nlmsg_len - NLMSG_SPACE(sizeof(*rthdr)); | |
d182ee13 | 134 | if (len < 0) |
9bf2c538 | 135 | goto out; |
d182ee13 ND |
136 | |
137 | parse_rtattr(tb, NETNSA_MAX, NETNS_RTA(rthdr), len); | |
138 | ||
86bf43c7 | 139 | if (tb[NETNSA_NSID]) { |
f19966ef | 140 | ret = rta_getattr_s32(tb[NETNSA_NSID]); |
86bf43c7 | 141 | } |
d182ee13 | 142 | |
9bf2c538 | 143 | out: |
86bf43c7 | 144 | free(answer); |
9bf2c538 | 145 | return ret; |
d182ee13 ND |
146 | } |
147 | ||
d652ccbf ND |
148 | struct nsid_cache { |
149 | struct hlist_node nsid_hash; | |
150 | struct hlist_node name_hash; | |
151 | int nsid; | |
2f29d6bb | 152 | char name[0]; |
d652ccbf ND |
153 | }; |
154 | ||
155 | #define NSIDMAP_SIZE 128 | |
156 | #define NSID_HASH_NSID(nsid) (nsid & (NSIDMAP_SIZE - 1)) | |
157 | #define NSID_HASH_NAME(name) (namehash(name) & (NSIDMAP_SIZE - 1)) | |
158 | ||
159 | static struct hlist_head nsid_head[NSIDMAP_SIZE]; | |
160 | static struct hlist_head name_head[NSIDMAP_SIZE]; | |
161 | ||
162 | static struct nsid_cache *netns_map_get_by_nsid(int nsid) | |
163 | { | |
d652ccbf | 164 | struct hlist_node *n; |
08ba67db GN |
165 | uint32_t h; |
166 | ||
167 | if (nsid < 0) | |
168 | return NULL; | |
d652ccbf | 169 | |
08ba67db | 170 | h = NSID_HASH_NSID(nsid); |
d652ccbf ND |
171 | hlist_for_each(n, &nsid_head[h]) { |
172 | struct nsid_cache *c = container_of(n, struct nsid_cache, | |
173 | nsid_hash); | |
174 | if (c->nsid == nsid) | |
175 | return c; | |
176 | } | |
177 | ||
178 | return NULL; | |
179 | } | |
180 | ||
9580bad7 ND |
181 | char *get_name_from_nsid(int nsid) |
182 | { | |
183 | struct nsid_cache *c; | |
184 | ||
08ba67db GN |
185 | if (nsid < 0) |
186 | return NULL; | |
187 | ||
9580bad7 ND |
188 | netns_nsid_socket_init(); |
189 | netns_map_init(); | |
190 | ||
191 | c = netns_map_get_by_nsid(nsid); | |
192 | if (c) | |
193 | return c->name; | |
194 | ||
195 | return NULL; | |
196 | } | |
197 | ||
2f29d6bb | 198 | static int netns_map_add(int nsid, const char *name) |
d652ccbf ND |
199 | { |
200 | struct nsid_cache *c; | |
201 | uint32_t h; | |
202 | ||
203 | if (netns_map_get_by_nsid(nsid) != NULL) | |
204 | return -EEXIST; | |
205 | ||
a1b4a274 | 206 | c = malloc(sizeof(*c) + strlen(name) + 1); |
d652ccbf ND |
207 | if (c == NULL) { |
208 | perror("malloc"); | |
209 | return -ENOMEM; | |
210 | } | |
211 | c->nsid = nsid; | |
212 | strcpy(c->name, name); | |
213 | ||
214 | h = NSID_HASH_NSID(nsid); | |
215 | hlist_add_head(&c->nsid_hash, &nsid_head[h]); | |
216 | ||
217 | h = NSID_HASH_NAME(name); | |
218 | hlist_add_head(&c->name_hash, &name_head[h]); | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | static void netns_map_del(struct nsid_cache *c) | |
224 | { | |
225 | hlist_del(&c->name_hash); | |
226 | hlist_del(&c->nsid_hash); | |
227 | free(c); | |
228 | } | |
229 | ||
e29a8e05 AA |
230 | void netns_nsid_socket_init(void) |
231 | { | |
232 | if (rtnsh.fd > -1 || !ipnetns_have_nsid()) | |
233 | return; | |
234 | ||
235 | if (rtnl_open(&rtnsh, 0) < 0) { | |
236 | fprintf(stderr, "Cannot open rtnetlink\n"); | |
237 | exit(1); | |
238 | } | |
239 | ||
240 | } | |
241 | ||
d652ccbf ND |
242 | void netns_map_init(void) |
243 | { | |
244 | static int initialized; | |
245 | struct dirent *entry; | |
246 | DIR *dir; | |
247 | int nsid; | |
248 | ||
249 | if (initialized || !ipnetns_have_nsid()) | |
250 | return; | |
251 | ||
d652ccbf ND |
252 | dir = opendir(NETNS_RUN_DIR); |
253 | if (!dir) | |
254 | return; | |
255 | ||
256 | while ((entry = readdir(dir)) != NULL) { | |
257 | if (strcmp(entry->d_name, ".") == 0) | |
258 | continue; | |
259 | if (strcmp(entry->d_name, "..") == 0) | |
260 | continue; | |
261 | nsid = get_netnsid_from_name(entry->d_name); | |
262 | ||
263 | if (nsid >= 0) | |
264 | netns_map_add(nsid, entry->d_name); | |
265 | } | |
266 | closedir(dir); | |
267 | initialized = 1; | |
268 | } | |
269 | ||
270 | static int netns_get_name(int nsid, char *name) | |
271 | { | |
272 | struct dirent *entry; | |
273 | DIR *dir; | |
274 | int id; | |
275 | ||
08ba67db GN |
276 | if (nsid < 0) |
277 | return -EINVAL; | |
278 | ||
d652ccbf ND |
279 | dir = opendir(NETNS_RUN_DIR); |
280 | if (!dir) | |
281 | return -ENOENT; | |
282 | ||
283 | while ((entry = readdir(dir)) != NULL) { | |
284 | if (strcmp(entry->d_name, ".") == 0) | |
285 | continue; | |
286 | if (strcmp(entry->d_name, "..") == 0) | |
287 | continue; | |
288 | id = get_netnsid_from_name(entry->d_name); | |
289 | ||
08ba67db | 290 | if (id >= 0 && nsid == id) { |
d652ccbf ND |
291 | strcpy(name, entry->d_name); |
292 | closedir(dir); | |
293 | return 0; | |
294 | } | |
295 | } | |
296 | closedir(dir); | |
297 | return -ENOENT; | |
298 | } | |
299 | ||
cd554f2c | 300 | int print_nsid(struct nlmsghdr *n, void *arg) |
d652ccbf ND |
301 | { |
302 | struct rtgenmsg *rthdr = NLMSG_DATA(n); | |
303 | struct rtattr *tb[NETNSA_MAX+1]; | |
304 | int len = n->nlmsg_len; | |
305 | FILE *fp = (FILE *)arg; | |
306 | struct nsid_cache *c; | |
307 | char name[NAME_MAX]; | |
eaefb078 | 308 | int nsid, current; |
d652ccbf ND |
309 | |
310 | if (n->nlmsg_type != RTM_NEWNSID && n->nlmsg_type != RTM_DELNSID) | |
311 | return 0; | |
312 | ||
313 | len -= NLMSG_SPACE(sizeof(*rthdr)); | |
314 | if (len < 0) { | |
315 | fprintf(stderr, "BUG: wrong nlmsg len %d in %s\n", len, | |
316 | __func__); | |
317 | return -1; | |
318 | } | |
319 | ||
320 | parse_rtattr(tb, NETNSA_MAX, NETNS_RTA(rthdr), len); | |
321 | if (tb[NETNSA_NSID] == NULL) { | |
322 | fprintf(stderr, "BUG: NETNSA_NSID is missing %s\n", __func__); | |
323 | return -1; | |
324 | } | |
325 | ||
e93d9221 | 326 | open_json_object(NULL); |
d652ccbf | 327 | if (n->nlmsg_type == RTM_DELNSID) |
e93d9221 | 328 | print_bool(PRINT_ANY, "deleted", "Deleted ", true); |
d652ccbf | 329 | |
f19966ef | 330 | nsid = rta_getattr_s32(tb[NETNSA_NSID]); |
eaefb078 | 331 | if (nsid < 0) |
1c9b6927 | 332 | print_string(PRINT_FP, NULL, "nsid unassigned ", NULL); |
eaefb078 | 333 | else |
f19966ef | 334 | print_int(PRINT_ANY, "nsid", "nsid %d ", nsid); |
eaefb078 ND |
335 | |
336 | if (tb[NETNSA_CURRENT_NSID]) { | |
f19966ef | 337 | current = rta_getattr_s32(tb[NETNSA_CURRENT_NSID]); |
eaefb078 | 338 | if (current < 0) |
1c9b6927 GN |
339 | print_string(PRINT_FP, NULL, |
340 | "current-nsid unassigned ", NULL); | |
eaefb078 | 341 | else |
f19966ef GN |
342 | print_int(PRINT_ANY, "current-nsid", |
343 | "current-nsid %d ", current); | |
eaefb078 | 344 | } |
d652ccbf | 345 | |
eaefb078 | 346 | c = netns_map_get_by_nsid(tb[NETNSA_CURRENT_NSID] ? current : nsid); |
d652ccbf | 347 | if (c != NULL) { |
e93d9221 SH |
348 | print_string(PRINT_ANY, "name", |
349 | "(iproute2 netns name: %s)", c->name); | |
d652ccbf ND |
350 | netns_map_del(c); |
351 | } | |
352 | ||
df6da60b | 353 | /* nsid might not be in cache */ |
d652ccbf ND |
354 | if (c == NULL && n->nlmsg_type == RTM_NEWNSID) |
355 | if (netns_get_name(nsid, name) == 0) { | |
e93d9221 SH |
356 | print_string(PRINT_ANY, "name", |
357 | "(iproute2 netns name: %s)", name); | |
d652ccbf ND |
358 | netns_map_add(nsid, name); |
359 | } | |
360 | ||
e93d9221 SH |
361 | print_string(PRINT_FP, NULL, "\n", NULL); |
362 | close_json_object(); | |
d652ccbf ND |
363 | fflush(fp); |
364 | return 0; | |
365 | } | |
366 | ||
eaefb078 ND |
367 | static int get_netnsid_from_netnsid(int nsid) |
368 | { | |
369 | struct { | |
370 | struct nlmsghdr n; | |
371 | struct rtgenmsg g; | |
372 | char buf[1024]; | |
373 | } req = { | |
374 | .n.nlmsg_len = NLMSG_LENGTH(NLMSG_ALIGN(sizeof(struct rtgenmsg))), | |
375 | .n.nlmsg_flags = NLM_F_REQUEST, | |
376 | .n.nlmsg_type = RTM_GETNSID, | |
377 | .g.rtgen_family = AF_UNSPEC, | |
378 | }; | |
379 | struct nlmsghdr *answer; | |
380 | int err; | |
381 | ||
382 | netns_nsid_socket_init(); | |
383 | ||
384 | err = addattr32(&req.n, sizeof(req), NETNSA_NSID, nsid); | |
385 | if (err) | |
386 | return err; | |
387 | ||
388 | if (filter.target_nsid >= 0) { | |
389 | err = addattr32(&req.n, sizeof(req), NETNSA_TARGET_NSID, | |
390 | filter.target_nsid); | |
391 | if (err) | |
392 | return err; | |
393 | } | |
394 | ||
395 | if (rtnl_talk(&rtnsh, &req.n, &answer) < 0) | |
396 | return -2; | |
397 | ||
398 | /* Validate message and parse attributes */ | |
399 | if (answer->nlmsg_type == NLMSG_ERROR) | |
400 | goto err_out; | |
401 | ||
402 | new_json_obj(json); | |
403 | err = print_nsid(answer, stdout); | |
404 | delete_json_obj(); | |
405 | err_out: | |
406 | free(answer); | |
407 | return err; | |
408 | } | |
409 | ||
410 | static int netns_filter_req(struct nlmsghdr *nlh, int reqlen) | |
411 | { | |
412 | int err; | |
413 | ||
414 | if (filter.target_nsid >= 0) { | |
415 | err = addattr32(nlh, reqlen, NETNSA_TARGET_NSID, | |
416 | filter.target_nsid); | |
417 | if (err) | |
418 | return err; | |
419 | } | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
d652ccbf ND |
424 | static int netns_list_id(int argc, char **argv) |
425 | { | |
eaefb078 ND |
426 | int nsid = -1; |
427 | ||
d652ccbf ND |
428 | if (!ipnetns_have_nsid()) { |
429 | fprintf(stderr, | |
430 | "RTM_GETNSID is not supported by the kernel.\n"); | |
431 | return -ENOTSUP; | |
432 | } | |
433 | ||
eaefb078 ND |
434 | filter.target_nsid = -1; |
435 | while (argc > 0) { | |
436 | if (strcmp(*argv, "target-nsid") == 0) { | |
437 | if (filter.target_nsid >= 0) | |
438 | duparg("target-nsid", *argv); | |
439 | NEXT_ARG(); | |
440 | ||
441 | if (get_integer(&filter.target_nsid, *argv, 0)) | |
d0b645a5 | 442 | invarg("\"target-nsid\" value is invalid", |
eaefb078 ND |
443 | *argv); |
444 | else if (filter.target_nsid < 0) | |
d0b645a5 | 445 | invarg("\"target-nsid\" value should be >= 0", |
eaefb078 ND |
446 | argv[1]); |
447 | } else if (strcmp(*argv, "nsid") == 0) { | |
448 | if (nsid >= 0) | |
449 | duparg("nsid", *argv); | |
450 | NEXT_ARG(); | |
451 | ||
452 | if (get_integer(&nsid, *argv, 0)) | |
d0b645a5 | 453 | invarg("\"nsid\" value is invalid", *argv); |
eaefb078 | 454 | else if (nsid < 0) |
d0b645a5 | 455 | invarg("\"nsid\" value should be >= 0", |
eaefb078 ND |
456 | argv[1]); |
457 | } else | |
458 | usage(); | |
459 | argc--; argv++; | |
460 | } | |
461 | ||
462 | if (nsid >= 0) | |
463 | return get_netnsid_from_netnsid(nsid); | |
464 | ||
465 | if (rtnl_nsiddump_req_filter_fn(&rth, AF_UNSPEC, | |
466 | netns_filter_req) < 0) { | |
d652ccbf ND |
467 | perror("Cannot send dump request"); |
468 | exit(1); | |
469 | } | |
e93d9221 SH |
470 | |
471 | new_json_obj(json); | |
d652ccbf | 472 | if (rtnl_dump_filter(&rth, print_nsid, stdout) < 0) { |
e93d9221 | 473 | delete_json_obj(); |
d652ccbf ND |
474 | fprintf(stderr, "Dump terminated\n"); |
475 | exit(1); | |
476 | } | |
e93d9221 | 477 | delete_json_obj(); |
d652ccbf ND |
478 | return 0; |
479 | } | |
480 | ||
0dc34c77 EB |
481 | static int netns_list(int argc, char **argv) |
482 | { | |
483 | struct dirent *entry; | |
484 | DIR *dir; | |
d182ee13 | 485 | int id; |
0dc34c77 EB |
486 | |
487 | dir = opendir(NETNS_RUN_DIR); | |
488 | if (!dir) | |
a05f6511 | 489 | return 0; |
0dc34c77 | 490 | |
e93d9221 | 491 | new_json_obj(json); |
0dc34c77 EB |
492 | while ((entry = readdir(dir)) != NULL) { |
493 | if (strcmp(entry->d_name, ".") == 0) | |
494 | continue; | |
495 | if (strcmp(entry->d_name, "..") == 0) | |
496 | continue; | |
e93d9221 SH |
497 | |
498 | open_json_object(NULL); | |
499 | print_string(PRINT_ANY, "name", | |
500 | "%s", entry->d_name); | |
4c7d9a58 ND |
501 | if (ipnetns_have_nsid()) { |
502 | id = get_netnsid_from_name(entry->d_name); | |
503 | if (id >= 0) | |
f19966ef | 504 | print_int(PRINT_ANY, "id", " (id: %d)", id); |
4c7d9a58 | 505 | } |
e93d9221 SH |
506 | print_string(PRINT_FP, NULL, "\n", NULL); |
507 | close_json_object(); | |
0dc34c77 EB |
508 | } |
509 | closedir(dir); | |
e93d9221 | 510 | delete_json_obj(); |
a05f6511 | 511 | return 0; |
0dc34c77 EB |
512 | } |
513 | ||
903818fb MC |
514 | static int do_switch(void *arg) |
515 | { | |
516 | char *netns = arg; | |
517 | ||
518 | /* we just changed namespaces. clear any vrf association | |
519 | * with prior namespace before exec'ing command | |
520 | */ | |
521 | vrf_reset(); | |
522 | ||
523 | return netns_switch(netns); | |
524 | } | |
525 | ||
b13ba03f VK |
526 | static int on_netns_exec(char *nsname, void *arg) |
527 | { | |
528 | char **argv = arg; | |
56f5daac | 529 | |
903818fb MC |
530 | printf("\nnetns: %s\n", nsname); |
531 | cmd_exec(argv[0], argv, true, do_switch, nsname); | |
b13ba03f VK |
532 | return 0; |
533 | } | |
534 | ||
535 | static int netns_exec(int argc, char **argv) | |
536 | { | |
537 | /* Setup the proper environment for apps that are not netns | |
538 | * aware, and execute a program in that environment. | |
539 | */ | |
b13ba03f VK |
540 | if (argc < 1 && !do_all) { |
541 | fprintf(stderr, "No netns name specified\n"); | |
542 | return -1; | |
543 | } | |
544 | if ((argc < 2 && !do_all) || (argc < 1 && do_all)) { | |
545 | fprintf(stderr, "No command specified\n"); | |
546 | return -1; | |
547 | } | |
548 | ||
549 | if (do_all) | |
903818fb | 550 | return netns_foreach(on_netns_exec, argv); |
ee9369a0 | 551 | |
b13ba03f VK |
552 | /* ip must return the status of the child, |
553 | * but do_cmd() will add a minus to this, | |
554 | * so let's add another one here to cancel it. | |
555 | */ | |
903818fb | 556 | return -cmd_exec(argv[1], argv + 1, !!batch_mode, do_switch, argv[0]); |
b13ba03f VK |
557 | } |
558 | ||
9a7b3d91 EB |
559 | static int is_pid(const char *str) |
560 | { | |
561 | int ch; | |
56f5daac | 562 | |
9a7b3d91 EB |
563 | for (; (ch = *str); str++) { |
564 | if (!isdigit(ch)) | |
565 | return 0; | |
566 | } | |
567 | return 1; | |
568 | } | |
569 | ||
570 | static int netns_pids(int argc, char **argv) | |
571 | { | |
572 | const char *name; | |
ea343669 | 573 | char net_path[PATH_MAX]; |
9a7b3d91 EB |
574 | int netns; |
575 | struct stat netst; | |
576 | DIR *dir; | |
577 | struct dirent *entry; | |
578 | ||
579 | if (argc < 1) { | |
580 | fprintf(stderr, "No netns name specified\n"); | |
a05f6511 | 581 | return -1; |
9a7b3d91 EB |
582 | } |
583 | if (argc > 1) { | |
584 | fprintf(stderr, "extra arguments specified\n"); | |
a05f6511 | 585 | return -1; |
9a7b3d91 EB |
586 | } |
587 | ||
588 | name = argv[0]; | |
589 | snprintf(net_path, sizeof(net_path), "%s/%s", NETNS_RUN_DIR, name); | |
590 | netns = open(net_path, O_RDONLY); | |
591 | if (netns < 0) { | |
592 | fprintf(stderr, "Cannot open network namespace: %s\n", | |
593 | strerror(errno)); | |
a05f6511 | 594 | return -1; |
9a7b3d91 EB |
595 | } |
596 | if (fstat(netns, &netst) < 0) { | |
597 | fprintf(stderr, "Stat of netns failed: %s\n", | |
598 | strerror(errno)); | |
a05f6511 | 599 | return -1; |
9a7b3d91 EB |
600 | } |
601 | dir = opendir("/proc/"); | |
602 | if (!dir) { | |
603 | fprintf(stderr, "Open of /proc failed: %s\n", | |
604 | strerror(errno)); | |
a05f6511 | 605 | return -1; |
9a7b3d91 | 606 | } |
56f5daac | 607 | while ((entry = readdir(dir))) { |
ea343669 | 608 | char pid_net_path[PATH_MAX]; |
9a7b3d91 | 609 | struct stat st; |
56f5daac | 610 | |
9a7b3d91 EB |
611 | if (!is_pid(entry->d_name)) |
612 | continue; | |
613 | snprintf(pid_net_path, sizeof(pid_net_path), "/proc/%s/ns/net", | |
614 | entry->d_name); | |
615 | if (stat(pid_net_path, &st) != 0) | |
616 | continue; | |
617 | if ((st.st_dev == netst.st_dev) && | |
618 | (st.st_ino == netst.st_ino)) { | |
619 | printf("%s\n", entry->d_name); | |
620 | } | |
621 | } | |
622 | closedir(dir); | |
a05f6511 | 623 | return 0; |
0612519e | 624 | |
9a7b3d91 EB |
625 | } |
626 | ||
9c49438a | 627 | int netns_identify_pid(const char *pidstr, char *name, int len) |
9a7b3d91 | 628 | { |
ea343669 | 629 | char net_path[PATH_MAX]; |
9a7b3d91 EB |
630 | int netns; |
631 | struct stat netst; | |
632 | DIR *dir; | |
633 | struct dirent *entry; | |
634 | ||
9c49438a | 635 | name[0] = '\0'; |
9a7b3d91 EB |
636 | |
637 | snprintf(net_path, sizeof(net_path), "/proc/%s/ns/net", pidstr); | |
638 | netns = open(net_path, O_RDONLY); | |
639 | if (netns < 0) { | |
640 | fprintf(stderr, "Cannot open network namespace: %s\n", | |
641 | strerror(errno)); | |
a05f6511 | 642 | return -1; |
9a7b3d91 EB |
643 | } |
644 | if (fstat(netns, &netst) < 0) { | |
645 | fprintf(stderr, "Stat of netns failed: %s\n", | |
646 | strerror(errno)); | |
a05f6511 | 647 | return -1; |
9a7b3d91 EB |
648 | } |
649 | dir = opendir(NETNS_RUN_DIR); | |
650 | if (!dir) { | |
651 | /* Succeed treat a missing directory as an empty directory */ | |
652 | if (errno == ENOENT) | |
a05f6511 | 653 | return 0; |
9a7b3d91 EB |
654 | |
655 | fprintf(stderr, "Failed to open directory %s:%s\n", | |
656 | NETNS_RUN_DIR, strerror(errno)); | |
a05f6511 | 657 | return -1; |
9a7b3d91 EB |
658 | } |
659 | ||
56f5daac | 660 | while ((entry = readdir(dir))) { |
ea343669 | 661 | char name_path[PATH_MAX]; |
9a7b3d91 EB |
662 | struct stat st; |
663 | ||
664 | if (strcmp(entry->d_name, ".") == 0) | |
665 | continue; | |
666 | if (strcmp(entry->d_name, "..") == 0) | |
667 | continue; | |
668 | ||
669 | snprintf(name_path, sizeof(name_path), "%s/%s", NETNS_RUN_DIR, | |
670 | entry->d_name); | |
671 | ||
672 | if (stat(name_path, &st) != 0) | |
673 | continue; | |
674 | ||
675 | if ((st.st_dev == netst.st_dev) && | |
676 | (st.st_ino == netst.st_ino)) { | |
18f156bf | 677 | strlcpy(name, entry->d_name, len); |
9a7b3d91 EB |
678 | } |
679 | } | |
680 | closedir(dir); | |
a05f6511 | 681 | return 0; |
0612519e | 682 | |
9a7b3d91 EB |
683 | } |
684 | ||
9c49438a DA |
685 | static int netns_identify(int argc, char **argv) |
686 | { | |
687 | const char *pidstr; | |
688 | char name[256]; | |
689 | int rc; | |
690 | ||
691 | if (argc < 1) { | |
692 | pidstr = "self"; | |
693 | } else if (argc > 1) { | |
694 | fprintf(stderr, "extra arguments specified\n"); | |
695 | return -1; | |
696 | } else { | |
697 | pidstr = argv[0]; | |
698 | if (!is_pid(pidstr)) { | |
699 | fprintf(stderr, "Specified string '%s' is not a pid\n", | |
700 | pidstr); | |
701 | return -1; | |
702 | } | |
703 | } | |
704 | ||
705 | rc = netns_identify_pid(pidstr, name, sizeof(name)); | |
706 | if (!rc) | |
707 | printf("%s\n", name); | |
708 | ||
709 | return rc; | |
710 | } | |
711 | ||
33724939 | 712 | static int on_netns_del(char *nsname, void *arg) |
0dc34c77 | 713 | { |
ea343669 | 714 | char netns_path[PATH_MAX]; |
0dc34c77 | 715 | |
33724939 | 716 | snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, nsname); |
0dc34c77 EB |
717 | umount2(netns_path, MNT_DETACH); |
718 | if (unlink(netns_path) < 0) { | |
14645ec2 | 719 | fprintf(stderr, "Cannot remove namespace file \"%s\": %s\n", |
0dc34c77 | 720 | netns_path, strerror(errno)); |
a05f6511 | 721 | return -1; |
0dc34c77 | 722 | } |
a05f6511 | 723 | return 0; |
0dc34c77 EB |
724 | } |
725 | ||
33724939 VK |
726 | static int netns_delete(int argc, char **argv) |
727 | { | |
728 | if (argc < 1 && !do_all) { | |
729 | fprintf(stderr, "No netns name specified\n"); | |
730 | return -1; | |
731 | } | |
732 | ||
733 | if (do_all) | |
734 | return netns_foreach(on_netns_del, NULL); | |
735 | ||
736 | return on_netns_del(argv[0], NULL); | |
737 | } | |
738 | ||
c1cbb18a | 739 | static int create_netns_dir(void) |
740 | { | |
741 | /* Create the base netns directory if it doesn't exist */ | |
742 | if (mkdir(NETNS_RUN_DIR, S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)) { | |
743 | if (errno != EEXIST) { | |
744 | fprintf(stderr, "mkdir %s failed: %s\n", | |
745 | NETNS_RUN_DIR, strerror(errno)); | |
746 | return -1; | |
747 | } | |
748 | } | |
749 | ||
750 | return 0; | |
751 | } | |
752 | ||
b2e29223 MC |
753 | /* Obtain a FD for the current namespace, so we can reenter it later */ |
754 | static void netns_save(void) | |
755 | { | |
756 | if (saved_netns != -1) | |
757 | return; | |
758 | ||
759 | saved_netns = open("/proc/self/ns/net", O_RDONLY | O_CLOEXEC); | |
760 | if (saved_netns == -1) { | |
761 | perror("Cannot open init namespace"); | |
762 | exit(1); | |
763 | } | |
764 | } | |
765 | ||
766 | static void netns_restore(void) | |
767 | { | |
768 | if (saved_netns == -1) | |
769 | return; | |
770 | ||
771 | if (setns(saved_netns, CLONE_NEWNET)) { | |
772 | perror("setns"); | |
773 | exit(1); | |
774 | } | |
775 | ||
776 | close(saved_netns); | |
777 | saved_netns = -1; | |
778 | } | |
779 | ||
e3dbcb2a | 780 | static int netns_add(int argc, char **argv, bool create) |
0dc34c77 EB |
781 | { |
782 | /* This function creates a new network namespace and | |
783 | * a new mount namespace and bind them into a well known | |
784 | * location in the filesystem based on the name provided. | |
785 | * | |
e3dbcb2a MC |
786 | * If create is true, a new namespace will be created, |
787 | * otherwise an existing one will be attached to the file. | |
788 | * | |
0dc34c77 EB |
789 | * The mount namespace is created so that any necessary |
790 | * userspace tweaks like remounting /sys, or bind mounting | |
e3dbcb2a | 791 | * a new /etc/resolv.conf can be shared between users. |
0dc34c77 | 792 | */ |
e3dbcb2a | 793 | char netns_path[PATH_MAX], proc_path[PATH_MAX]; |
0dc34c77 | 794 | const char *name; |
e3dbcb2a | 795 | pid_t pid; |
223f4d8e | 796 | int fd; |
58a3e827 | 797 | int made_netns_run_dir_mount = 0; |
0dc34c77 | 798 | |
e3dbcb2a MC |
799 | if (create) { |
800 | if (argc < 1) { | |
801 | fprintf(stderr, "No netns name specified\n"); | |
802 | return -1; | |
803 | } | |
804 | } else { | |
805 | if (argc < 2) { | |
806 | fprintf(stderr, "No netns name and PID specified\n"); | |
807 | return -1; | |
808 | } | |
809 | ||
810 | if (get_s32(&pid, argv[1], 0) || !pid) { | |
811 | fprintf(stderr, "Invalid PID: %s\n", argv[1]); | |
812 | return -1; | |
813 | } | |
0dc34c77 EB |
814 | } |
815 | name = argv[0]; | |
816 | ||
817 | snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, name); | |
818 | ||
c1cbb18a | 819 | if (create_netns_dir()) |
820 | return -1; | |
0dc34c77 | 821 | |
d259f030 | 822 | /* Make it possible for network namespace mounts to propagate between |
58a3e827 EB |
823 | * mount namespaces. This makes it likely that a unmounting a network |
824 | * namespace file in one namespace will unmount the network namespace | |
825 | * file in all namespaces allowing the network namespace to be freed | |
826 | * sooner. | |
827 | */ | |
828 | while (mount("", NETNS_RUN_DIR, "none", MS_SHARED | MS_REC, NULL)) { | |
829 | /* Fail unless we need to make the mount point */ | |
830 | if (errno != EINVAL || made_netns_run_dir_mount) { | |
831 | fprintf(stderr, "mount --make-shared %s failed: %s\n", | |
832 | NETNS_RUN_DIR, strerror(errno)); | |
a05f6511 | 833 | return -1; |
58a3e827 EB |
834 | } |
835 | ||
836 | /* Upgrade NETNS_RUN_DIR to a mount point */ | |
d6a4076b | 837 | if (mount(NETNS_RUN_DIR, NETNS_RUN_DIR, "none", MS_BIND | MS_REC, NULL)) { |
58a3e827 EB |
838 | fprintf(stderr, "mount --bind %s %s failed: %s\n", |
839 | NETNS_RUN_DIR, NETNS_RUN_DIR, strerror(errno)); | |
a05f6511 | 840 | return -1; |
58a3e827 EB |
841 | } |
842 | made_netns_run_dir_mount = 1; | |
843 | } | |
844 | ||
0dc34c77 | 845 | /* Create the filesystem state */ |
223f4d8e EB |
846 | fd = open(netns_path, O_RDONLY|O_CREAT|O_EXCL, 0); |
847 | if (fd < 0) { | |
55713c8c | 848 | fprintf(stderr, "Cannot create namespace file \"%s\": %s\n", |
0dc34c77 | 849 | netns_path, strerror(errno)); |
a05f6511 | 850 | return -1; |
0dc34c77 | 851 | } |
223f4d8e | 852 | close(fd); |
e3dbcb2a MC |
853 | |
854 | if (create) { | |
80a931d4 | 855 | netns_save(); |
e3dbcb2a MC |
856 | if (unshare(CLONE_NEWNET) < 0) { |
857 | fprintf(stderr, "Failed to create a new network namespace \"%s\": %s\n", | |
858 | name, strerror(errno)); | |
859 | goto out_delete; | |
860 | } | |
861 | ||
862 | strcpy(proc_path, "/proc/self/ns/net"); | |
863 | } else { | |
864 | snprintf(proc_path, sizeof(proc_path), "/proc/%d/ns/net", pid); | |
0dc34c77 EB |
865 | } |
866 | ||
867 | /* Bind the netns last so I can watch for it */ | |
e3dbcb2a MC |
868 | if (mount(proc_path, netns_path, "none", MS_BIND, NULL) < 0) { |
869 | fprintf(stderr, "Bind %s -> %s failed: %s\n", | |
870 | proc_path, netns_path, strerror(errno)); | |
0dc34c77 EB |
871 | goto out_delete; |
872 | } | |
b2e29223 MC |
873 | netns_restore(); |
874 | ||
a05f6511 | 875 | return 0; |
0dc34c77 | 876 | out_delete: |
e3dbcb2a | 877 | if (create) { |
b2e29223 | 878 | netns_restore(); |
e3dbcb2a MC |
879 | netns_delete(argc, argv); |
880 | } else if (unlink(netns_path) < 0) { | |
881 | fprintf(stderr, "Cannot remove namespace file \"%s\": %s\n", | |
882 | netns_path, strerror(errno)); | |
883 | } | |
a05f6511 | 884 | return -1; |
0dc34c77 EB |
885 | } |
886 | ||
974ef93b | 887 | int set_netnsid_from_name(const char *name, int nsid) |
d182ee13 ND |
888 | { |
889 | struct { | |
890 | struct nlmsghdr n; | |
891 | struct rtgenmsg g; | |
892 | char buf[1024]; | |
d17b136f PS |
893 | } req = { |
894 | .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg)), | |
895 | .n.nlmsg_flags = NLM_F_REQUEST, | |
896 | .n.nlmsg_type = RTM_NEWNSID, | |
897 | .g.rtgen_family = AF_UNSPEC, | |
898 | }; | |
d182ee13 ND |
899 | int fd, err = 0; |
900 | ||
974ef93b ND |
901 | netns_nsid_socket_init(); |
902 | ||
d182ee13 ND |
903 | fd = netns_get_fd(name); |
904 | if (fd < 0) | |
905 | return fd; | |
906 | ||
907 | addattr32(&req.n, 1024, NETNSA_FD, fd); | |
908 | addattr32(&req.n, 1024, NETNSA_NSID, nsid); | |
86bf43c7 | 909 | if (rtnl_talk(&rth, &req.n, NULL) < 0) |
d182ee13 ND |
910 | err = -2; |
911 | ||
912 | close(fd); | |
913 | return err; | |
914 | } | |
915 | ||
916 | static int netns_set(int argc, char **argv) | |
917 | { | |
ea343669 | 918 | char netns_path[PATH_MAX]; |
d182ee13 | 919 | const char *name; |
ebe3ce2f | 920 | int netns, nsid; |
d182ee13 ND |
921 | |
922 | if (argc < 1) { | |
923 | fprintf(stderr, "No netns name specified\n"); | |
924 | return -1; | |
925 | } | |
926 | if (argc < 2) { | |
927 | fprintf(stderr, "No nsid specified\n"); | |
928 | return -1; | |
929 | } | |
930 | name = argv[0]; | |
375d51ca CB |
931 | /* If a negative nsid is specified the kernel will select the nsid. */ |
932 | if (strcmp(argv[1], "auto") == 0) | |
933 | nsid = -1; | |
ebe3ce2f | 934 | else if (get_integer(&nsid, argv[1], 0)) |
d0b645a5 | 935 | invarg("Invalid \"netnsid\" value", argv[1]); |
ebe3ce2f | 936 | else if (nsid < 0) |
d0b645a5 | 937 | invarg("\"netnsid\" value should be >= 0", argv[1]); |
d182ee13 ND |
938 | |
939 | snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, name); | |
940 | netns = open(netns_path, O_RDONLY | O_CLOEXEC); | |
941 | if (netns < 0) { | |
942 | fprintf(stderr, "Cannot open network namespace \"%s\": %s\n", | |
943 | name, strerror(errno)); | |
944 | return -1; | |
945 | } | |
946 | ||
947 | return set_netnsid_from_name(name, nsid); | |
948 | } | |
0dc34c77 EB |
949 | |
950 | static int netns_monitor(int argc, char **argv) | |
951 | { | |
952 | char buf[4096]; | |
953 | struct inotify_event *event; | |
954 | int fd; | |
56f5daac | 955 | |
0dc34c77 EB |
956 | fd = inotify_init(); |
957 | if (fd < 0) { | |
958 | fprintf(stderr, "inotify_init failed: %s\n", | |
959 | strerror(errno)); | |
a05f6511 | 960 | return -1; |
0dc34c77 | 961 | } |
c1cbb18a | 962 | |
963 | if (create_netns_dir()) | |
964 | return -1; | |
965 | ||
0dc34c77 EB |
966 | if (inotify_add_watch(fd, NETNS_RUN_DIR, IN_CREATE | IN_DELETE) < 0) { |
967 | fprintf(stderr, "inotify_add_watch failed: %s\n", | |
968 | strerror(errno)); | |
a05f6511 | 969 | return -1; |
0dc34c77 | 970 | } |
56f5daac | 971 | for (;;) { |
0dc34c77 | 972 | ssize_t len = read(fd, buf, sizeof(buf)); |
56f5daac | 973 | |
0dc34c77 EB |
974 | if (len < 0) { |
975 | fprintf(stderr, "read failed: %s\n", | |
976 | strerror(errno)); | |
a05f6511 | 977 | return -1; |
0dc34c77 EB |
978 | } |
979 | for (event = (struct inotify_event *)buf; | |
980 | (char *)event < &buf[len]; | |
981 | event = (struct inotify_event *)((char *)event + sizeof(*event) + event->len)) { | |
982 | if (event->mask & IN_CREATE) | |
983 | printf("add %s\n", event->name); | |
984 | if (event->mask & IN_DELETE) | |
985 | printf("delete %s\n", event->name); | |
986 | } | |
987 | } | |
a05f6511 | 988 | return 0; |
0dc34c77 EB |
989 | } |
990 | ||
79928fd0 MC |
991 | static int invalid_name(const char *name) |
992 | { | |
d3f0b091 MC |
993 | return !*name || strlen(name) > NAME_MAX || |
994 | strchr(name, '/') || !strcmp(name, ".") || !strcmp(name, ".."); | |
79928fd0 MC |
995 | } |
996 | ||
0dc34c77 EB |
997 | int do_netns(int argc, char **argv) |
998 | { | |
e29a8e05 | 999 | netns_nsid_socket_init(); |
d652ccbf | 1000 | |
e29a8e05 AA |
1001 | if (argc < 1) { |
1002 | netns_map_init(); | |
0dc34c77 | 1003 | return netns_list(0, NULL); |
e29a8e05 | 1004 | } |
0dc34c77 | 1005 | |
b7f28e0b | 1006 | if (!do_all && argc > 1 && invalid_name(argv[1])) { |
79928fd0 MC |
1007 | fprintf(stderr, "Invalid netns name \"%s\"\n", argv[1]); |
1008 | exit(-1); | |
1009 | } | |
1010 | ||
0dc34c77 | 1011 | if ((matches(*argv, "list") == 0) || (matches(*argv, "show") == 0) || |
e29a8e05 AA |
1012 | (matches(*argv, "lst") == 0)) { |
1013 | netns_map_init(); | |
0dc34c77 | 1014 | return netns_list(argc-1, argv+1); |
e29a8e05 | 1015 | } |
0dc34c77 | 1016 | |
e29a8e05 AA |
1017 | if ((matches(*argv, "list-id") == 0)) { |
1018 | netns_map_init(); | |
d652ccbf | 1019 | return netns_list_id(argc-1, argv+1); |
e29a8e05 | 1020 | } |
d652ccbf | 1021 | |
0dc34c77 | 1022 | if (matches(*argv, "help") == 0) |
8e2d47dc | 1023 | return usage(); |
0dc34c77 EB |
1024 | |
1025 | if (matches(*argv, "add") == 0) | |
e3dbcb2a | 1026 | return netns_add(argc-1, argv+1, true); |
0dc34c77 | 1027 | |
d182ee13 ND |
1028 | if (matches(*argv, "set") == 0) |
1029 | return netns_set(argc-1, argv+1); | |
1030 | ||
0dc34c77 EB |
1031 | if (matches(*argv, "delete") == 0) |
1032 | return netns_delete(argc-1, argv+1); | |
1033 | ||
9a7b3d91 EB |
1034 | if (matches(*argv, "identify") == 0) |
1035 | return netns_identify(argc-1, argv+1); | |
1036 | ||
1037 | if (matches(*argv, "pids") == 0) | |
1038 | return netns_pids(argc-1, argv+1); | |
1039 | ||
0dc34c77 EB |
1040 | if (matches(*argv, "exec") == 0) |
1041 | return netns_exec(argc-1, argv+1); | |
1042 | ||
1043 | if (matches(*argv, "monitor") == 0) | |
1044 | return netns_monitor(argc-1, argv+1); | |
1045 | ||
e3dbcb2a MC |
1046 | if (matches(*argv, "attach") == 0) |
1047 | return netns_add(argc-1, argv+1, false); | |
1048 | ||
0dc34c77 | 1049 | fprintf(stderr, "Command \"%s\" is unknown, try \"ip netns help\".\n", *argv); |
a05f6511 | 1050 | exit(-1); |
0dc34c77 | 1051 | } |