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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 | { | |
164 | uint32_t h = NSID_HASH_NSID(nsid); | |
165 | struct hlist_node *n; | |
166 | ||
167 | hlist_for_each(n, &nsid_head[h]) { | |
168 | struct nsid_cache *c = container_of(n, struct nsid_cache, | |
169 | nsid_hash); | |
170 | if (c->nsid == nsid) | |
171 | return c; | |
172 | } | |
173 | ||
174 | return NULL; | |
175 | } | |
176 | ||
9580bad7 ND |
177 | char *get_name_from_nsid(int nsid) |
178 | { | |
179 | struct nsid_cache *c; | |
180 | ||
181 | netns_nsid_socket_init(); | |
182 | netns_map_init(); | |
183 | ||
184 | c = netns_map_get_by_nsid(nsid); | |
185 | if (c) | |
186 | return c->name; | |
187 | ||
188 | return NULL; | |
189 | } | |
190 | ||
2f29d6bb | 191 | static int netns_map_add(int nsid, const char *name) |
d652ccbf ND |
192 | { |
193 | struct nsid_cache *c; | |
194 | uint32_t h; | |
195 | ||
196 | if (netns_map_get_by_nsid(nsid) != NULL) | |
197 | return -EEXIST; | |
198 | ||
a1b4a274 | 199 | c = malloc(sizeof(*c) + strlen(name) + 1); |
d652ccbf ND |
200 | if (c == NULL) { |
201 | perror("malloc"); | |
202 | return -ENOMEM; | |
203 | } | |
204 | c->nsid = nsid; | |
205 | strcpy(c->name, name); | |
206 | ||
207 | h = NSID_HASH_NSID(nsid); | |
208 | hlist_add_head(&c->nsid_hash, &nsid_head[h]); | |
209 | ||
210 | h = NSID_HASH_NAME(name); | |
211 | hlist_add_head(&c->name_hash, &name_head[h]); | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | static void netns_map_del(struct nsid_cache *c) | |
217 | { | |
218 | hlist_del(&c->name_hash); | |
219 | hlist_del(&c->nsid_hash); | |
220 | free(c); | |
221 | } | |
222 | ||
e29a8e05 AA |
223 | void netns_nsid_socket_init(void) |
224 | { | |
225 | if (rtnsh.fd > -1 || !ipnetns_have_nsid()) | |
226 | return; | |
227 | ||
228 | if (rtnl_open(&rtnsh, 0) < 0) { | |
229 | fprintf(stderr, "Cannot open rtnetlink\n"); | |
230 | exit(1); | |
231 | } | |
232 | ||
233 | } | |
234 | ||
d652ccbf ND |
235 | void netns_map_init(void) |
236 | { | |
237 | static int initialized; | |
238 | struct dirent *entry; | |
239 | DIR *dir; | |
240 | int nsid; | |
241 | ||
242 | if (initialized || !ipnetns_have_nsid()) | |
243 | return; | |
244 | ||
d652ccbf ND |
245 | dir = opendir(NETNS_RUN_DIR); |
246 | if (!dir) | |
247 | return; | |
248 | ||
249 | while ((entry = readdir(dir)) != NULL) { | |
250 | if (strcmp(entry->d_name, ".") == 0) | |
251 | continue; | |
252 | if (strcmp(entry->d_name, "..") == 0) | |
253 | continue; | |
254 | nsid = get_netnsid_from_name(entry->d_name); | |
255 | ||
256 | if (nsid >= 0) | |
257 | netns_map_add(nsid, entry->d_name); | |
258 | } | |
259 | closedir(dir); | |
260 | initialized = 1; | |
261 | } | |
262 | ||
263 | static int netns_get_name(int nsid, char *name) | |
264 | { | |
265 | struct dirent *entry; | |
266 | DIR *dir; | |
267 | int id; | |
268 | ||
269 | dir = opendir(NETNS_RUN_DIR); | |
270 | if (!dir) | |
271 | return -ENOENT; | |
272 | ||
273 | while ((entry = readdir(dir)) != NULL) { | |
274 | if (strcmp(entry->d_name, ".") == 0) | |
275 | continue; | |
276 | if (strcmp(entry->d_name, "..") == 0) | |
277 | continue; | |
278 | id = get_netnsid_from_name(entry->d_name); | |
279 | ||
280 | if (nsid == id) { | |
281 | strcpy(name, entry->d_name); | |
282 | closedir(dir); | |
283 | return 0; | |
284 | } | |
285 | } | |
286 | closedir(dir); | |
287 | return -ENOENT; | |
288 | } | |
289 | ||
cd554f2c | 290 | int print_nsid(struct nlmsghdr *n, void *arg) |
d652ccbf ND |
291 | { |
292 | struct rtgenmsg *rthdr = NLMSG_DATA(n); | |
293 | struct rtattr *tb[NETNSA_MAX+1]; | |
294 | int len = n->nlmsg_len; | |
295 | FILE *fp = (FILE *)arg; | |
296 | struct nsid_cache *c; | |
297 | char name[NAME_MAX]; | |
eaefb078 | 298 | int nsid, current; |
d652ccbf ND |
299 | |
300 | if (n->nlmsg_type != RTM_NEWNSID && n->nlmsg_type != RTM_DELNSID) | |
301 | return 0; | |
302 | ||
303 | len -= NLMSG_SPACE(sizeof(*rthdr)); | |
304 | if (len < 0) { | |
305 | fprintf(stderr, "BUG: wrong nlmsg len %d in %s\n", len, | |
306 | __func__); | |
307 | return -1; | |
308 | } | |
309 | ||
310 | parse_rtattr(tb, NETNSA_MAX, NETNS_RTA(rthdr), len); | |
311 | if (tb[NETNSA_NSID] == NULL) { | |
312 | fprintf(stderr, "BUG: NETNSA_NSID is missing %s\n", __func__); | |
313 | return -1; | |
314 | } | |
315 | ||
e93d9221 | 316 | open_json_object(NULL); |
d652ccbf | 317 | if (n->nlmsg_type == RTM_DELNSID) |
e93d9221 | 318 | print_bool(PRINT_ANY, "deleted", "Deleted ", true); |
d652ccbf | 319 | |
f19966ef | 320 | nsid = rta_getattr_s32(tb[NETNSA_NSID]); |
eaefb078 ND |
321 | if (nsid < 0) |
322 | print_string(PRINT_ANY, "nsid", "nsid %s ", "not-assigned"); | |
323 | else | |
f19966ef | 324 | print_int(PRINT_ANY, "nsid", "nsid %d ", nsid); |
eaefb078 ND |
325 | |
326 | if (tb[NETNSA_CURRENT_NSID]) { | |
f19966ef | 327 | current = rta_getattr_s32(tb[NETNSA_CURRENT_NSID]); |
eaefb078 ND |
328 | if (current < 0) |
329 | print_string(PRINT_ANY, "current-nsid", | |
330 | "current-nsid %s ", "not-assigned"); | |
331 | else | |
f19966ef GN |
332 | print_int(PRINT_ANY, "current-nsid", |
333 | "current-nsid %d ", current); | |
eaefb078 | 334 | } |
d652ccbf | 335 | |
eaefb078 | 336 | c = netns_map_get_by_nsid(tb[NETNSA_CURRENT_NSID] ? current : nsid); |
d652ccbf | 337 | if (c != NULL) { |
e93d9221 SH |
338 | print_string(PRINT_ANY, "name", |
339 | "(iproute2 netns name: %s)", c->name); | |
d652ccbf ND |
340 | netns_map_del(c); |
341 | } | |
342 | ||
df6da60b | 343 | /* nsid might not be in cache */ |
d652ccbf ND |
344 | if (c == NULL && n->nlmsg_type == RTM_NEWNSID) |
345 | if (netns_get_name(nsid, name) == 0) { | |
e93d9221 SH |
346 | print_string(PRINT_ANY, "name", |
347 | "(iproute2 netns name: %s)", name); | |
d652ccbf ND |
348 | netns_map_add(nsid, name); |
349 | } | |
350 | ||
e93d9221 SH |
351 | print_string(PRINT_FP, NULL, "\n", NULL); |
352 | close_json_object(); | |
d652ccbf ND |
353 | fflush(fp); |
354 | return 0; | |
355 | } | |
356 | ||
eaefb078 ND |
357 | static int get_netnsid_from_netnsid(int nsid) |
358 | { | |
359 | struct { | |
360 | struct nlmsghdr n; | |
361 | struct rtgenmsg g; | |
362 | char buf[1024]; | |
363 | } req = { | |
364 | .n.nlmsg_len = NLMSG_LENGTH(NLMSG_ALIGN(sizeof(struct rtgenmsg))), | |
365 | .n.nlmsg_flags = NLM_F_REQUEST, | |
366 | .n.nlmsg_type = RTM_GETNSID, | |
367 | .g.rtgen_family = AF_UNSPEC, | |
368 | }; | |
369 | struct nlmsghdr *answer; | |
370 | int err; | |
371 | ||
372 | netns_nsid_socket_init(); | |
373 | ||
374 | err = addattr32(&req.n, sizeof(req), NETNSA_NSID, nsid); | |
375 | if (err) | |
376 | return err; | |
377 | ||
378 | if (filter.target_nsid >= 0) { | |
379 | err = addattr32(&req.n, sizeof(req), NETNSA_TARGET_NSID, | |
380 | filter.target_nsid); | |
381 | if (err) | |
382 | return err; | |
383 | } | |
384 | ||
385 | if (rtnl_talk(&rtnsh, &req.n, &answer) < 0) | |
386 | return -2; | |
387 | ||
388 | /* Validate message and parse attributes */ | |
389 | if (answer->nlmsg_type == NLMSG_ERROR) | |
390 | goto err_out; | |
391 | ||
392 | new_json_obj(json); | |
393 | err = print_nsid(answer, stdout); | |
394 | delete_json_obj(); | |
395 | err_out: | |
396 | free(answer); | |
397 | return err; | |
398 | } | |
399 | ||
400 | static int netns_filter_req(struct nlmsghdr *nlh, int reqlen) | |
401 | { | |
402 | int err; | |
403 | ||
404 | if (filter.target_nsid >= 0) { | |
405 | err = addattr32(nlh, reqlen, NETNSA_TARGET_NSID, | |
406 | filter.target_nsid); | |
407 | if (err) | |
408 | return err; | |
409 | } | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
d652ccbf ND |
414 | static int netns_list_id(int argc, char **argv) |
415 | { | |
eaefb078 ND |
416 | int nsid = -1; |
417 | ||
d652ccbf ND |
418 | if (!ipnetns_have_nsid()) { |
419 | fprintf(stderr, | |
420 | "RTM_GETNSID is not supported by the kernel.\n"); | |
421 | return -ENOTSUP; | |
422 | } | |
423 | ||
eaefb078 ND |
424 | filter.target_nsid = -1; |
425 | while (argc > 0) { | |
426 | if (strcmp(*argv, "target-nsid") == 0) { | |
427 | if (filter.target_nsid >= 0) | |
428 | duparg("target-nsid", *argv); | |
429 | NEXT_ARG(); | |
430 | ||
431 | if (get_integer(&filter.target_nsid, *argv, 0)) | |
432 | invarg("\"target-nsid\" value is invalid\n", | |
433 | *argv); | |
434 | else if (filter.target_nsid < 0) | |
435 | invarg("\"target-nsid\" value should be >= 0\n", | |
436 | argv[1]); | |
437 | } else if (strcmp(*argv, "nsid") == 0) { | |
438 | if (nsid >= 0) | |
439 | duparg("nsid", *argv); | |
440 | NEXT_ARG(); | |
441 | ||
442 | if (get_integer(&nsid, *argv, 0)) | |
443 | invarg("\"nsid\" value is invalid\n", *argv); | |
444 | else if (nsid < 0) | |
445 | invarg("\"nsid\" value should be >= 0\n", | |
446 | argv[1]); | |
447 | } else | |
448 | usage(); | |
449 | argc--; argv++; | |
450 | } | |
451 | ||
452 | if (nsid >= 0) | |
453 | return get_netnsid_from_netnsid(nsid); | |
454 | ||
455 | if (rtnl_nsiddump_req_filter_fn(&rth, AF_UNSPEC, | |
456 | netns_filter_req) < 0) { | |
d652ccbf ND |
457 | perror("Cannot send dump request"); |
458 | exit(1); | |
459 | } | |
e93d9221 SH |
460 | |
461 | new_json_obj(json); | |
d652ccbf | 462 | if (rtnl_dump_filter(&rth, print_nsid, stdout) < 0) { |
e93d9221 | 463 | delete_json_obj(); |
d652ccbf ND |
464 | fprintf(stderr, "Dump terminated\n"); |
465 | exit(1); | |
466 | } | |
e93d9221 | 467 | delete_json_obj(); |
d652ccbf ND |
468 | return 0; |
469 | } | |
470 | ||
0dc34c77 EB |
471 | static int netns_list(int argc, char **argv) |
472 | { | |
473 | struct dirent *entry; | |
474 | DIR *dir; | |
d182ee13 | 475 | int id; |
0dc34c77 EB |
476 | |
477 | dir = opendir(NETNS_RUN_DIR); | |
478 | if (!dir) | |
a05f6511 | 479 | return 0; |
0dc34c77 | 480 | |
e93d9221 | 481 | new_json_obj(json); |
0dc34c77 EB |
482 | while ((entry = readdir(dir)) != NULL) { |
483 | if (strcmp(entry->d_name, ".") == 0) | |
484 | continue; | |
485 | if (strcmp(entry->d_name, "..") == 0) | |
486 | continue; | |
e93d9221 SH |
487 | |
488 | open_json_object(NULL); | |
489 | print_string(PRINT_ANY, "name", | |
490 | "%s", entry->d_name); | |
4c7d9a58 ND |
491 | if (ipnetns_have_nsid()) { |
492 | id = get_netnsid_from_name(entry->d_name); | |
493 | if (id >= 0) | |
f19966ef | 494 | print_int(PRINT_ANY, "id", " (id: %d)", id); |
4c7d9a58 | 495 | } |
e93d9221 SH |
496 | print_string(PRINT_FP, NULL, "\n", NULL); |
497 | close_json_object(); | |
0dc34c77 EB |
498 | } |
499 | closedir(dir); | |
e93d9221 | 500 | delete_json_obj(); |
a05f6511 | 501 | return 0; |
0dc34c77 EB |
502 | } |
503 | ||
903818fb MC |
504 | static int do_switch(void *arg) |
505 | { | |
506 | char *netns = arg; | |
507 | ||
508 | /* we just changed namespaces. clear any vrf association | |
509 | * with prior namespace before exec'ing command | |
510 | */ | |
511 | vrf_reset(); | |
512 | ||
513 | return netns_switch(netns); | |
514 | } | |
515 | ||
b13ba03f VK |
516 | static int on_netns_exec(char *nsname, void *arg) |
517 | { | |
518 | char **argv = arg; | |
56f5daac | 519 | |
903818fb MC |
520 | printf("\nnetns: %s\n", nsname); |
521 | cmd_exec(argv[0], argv, true, do_switch, nsname); | |
b13ba03f VK |
522 | return 0; |
523 | } | |
524 | ||
525 | static int netns_exec(int argc, char **argv) | |
526 | { | |
527 | /* Setup the proper environment for apps that are not netns | |
528 | * aware, and execute a program in that environment. | |
529 | */ | |
b13ba03f VK |
530 | if (argc < 1 && !do_all) { |
531 | fprintf(stderr, "No netns name specified\n"); | |
532 | return -1; | |
533 | } | |
534 | if ((argc < 2 && !do_all) || (argc < 1 && do_all)) { | |
535 | fprintf(stderr, "No command specified\n"); | |
536 | return -1; | |
537 | } | |
538 | ||
539 | if (do_all) | |
903818fb | 540 | return netns_foreach(on_netns_exec, argv); |
ee9369a0 | 541 | |
b13ba03f VK |
542 | /* ip must return the status of the child, |
543 | * but do_cmd() will add a minus to this, | |
544 | * so let's add another one here to cancel it. | |
545 | */ | |
903818fb | 546 | return -cmd_exec(argv[1], argv + 1, !!batch_mode, do_switch, argv[0]); |
b13ba03f VK |
547 | } |
548 | ||
9a7b3d91 EB |
549 | static int is_pid(const char *str) |
550 | { | |
551 | int ch; | |
56f5daac | 552 | |
9a7b3d91 EB |
553 | for (; (ch = *str); str++) { |
554 | if (!isdigit(ch)) | |
555 | return 0; | |
556 | } | |
557 | return 1; | |
558 | } | |
559 | ||
560 | static int netns_pids(int argc, char **argv) | |
561 | { | |
562 | const char *name; | |
ea343669 | 563 | char net_path[PATH_MAX]; |
9a7b3d91 EB |
564 | int netns; |
565 | struct stat netst; | |
566 | DIR *dir; | |
567 | struct dirent *entry; | |
568 | ||
569 | if (argc < 1) { | |
570 | fprintf(stderr, "No netns name specified\n"); | |
a05f6511 | 571 | return -1; |
9a7b3d91 EB |
572 | } |
573 | if (argc > 1) { | |
574 | fprintf(stderr, "extra arguments specified\n"); | |
a05f6511 | 575 | return -1; |
9a7b3d91 EB |
576 | } |
577 | ||
578 | name = argv[0]; | |
579 | snprintf(net_path, sizeof(net_path), "%s/%s", NETNS_RUN_DIR, name); | |
580 | netns = open(net_path, O_RDONLY); | |
581 | if (netns < 0) { | |
582 | fprintf(stderr, "Cannot open network namespace: %s\n", | |
583 | strerror(errno)); | |
a05f6511 | 584 | return -1; |
9a7b3d91 EB |
585 | } |
586 | if (fstat(netns, &netst) < 0) { | |
587 | fprintf(stderr, "Stat of netns failed: %s\n", | |
588 | strerror(errno)); | |
a05f6511 | 589 | return -1; |
9a7b3d91 EB |
590 | } |
591 | dir = opendir("/proc/"); | |
592 | if (!dir) { | |
593 | fprintf(stderr, "Open of /proc failed: %s\n", | |
594 | strerror(errno)); | |
a05f6511 | 595 | return -1; |
9a7b3d91 | 596 | } |
56f5daac | 597 | while ((entry = readdir(dir))) { |
ea343669 | 598 | char pid_net_path[PATH_MAX]; |
9a7b3d91 | 599 | struct stat st; |
56f5daac | 600 | |
9a7b3d91 EB |
601 | if (!is_pid(entry->d_name)) |
602 | continue; | |
603 | snprintf(pid_net_path, sizeof(pid_net_path), "/proc/%s/ns/net", | |
604 | entry->d_name); | |
605 | if (stat(pid_net_path, &st) != 0) | |
606 | continue; | |
607 | if ((st.st_dev == netst.st_dev) && | |
608 | (st.st_ino == netst.st_ino)) { | |
609 | printf("%s\n", entry->d_name); | |
610 | } | |
611 | } | |
612 | closedir(dir); | |
a05f6511 | 613 | return 0; |
0612519e | 614 | |
9a7b3d91 EB |
615 | } |
616 | ||
9c49438a | 617 | int netns_identify_pid(const char *pidstr, char *name, int len) |
9a7b3d91 | 618 | { |
ea343669 | 619 | char net_path[PATH_MAX]; |
9a7b3d91 EB |
620 | int netns; |
621 | struct stat netst; | |
622 | DIR *dir; | |
623 | struct dirent *entry; | |
624 | ||
9c49438a | 625 | name[0] = '\0'; |
9a7b3d91 EB |
626 | |
627 | snprintf(net_path, sizeof(net_path), "/proc/%s/ns/net", pidstr); | |
628 | netns = open(net_path, O_RDONLY); | |
629 | if (netns < 0) { | |
630 | fprintf(stderr, "Cannot open network namespace: %s\n", | |
631 | strerror(errno)); | |
a05f6511 | 632 | return -1; |
9a7b3d91 EB |
633 | } |
634 | if (fstat(netns, &netst) < 0) { | |
635 | fprintf(stderr, "Stat of netns failed: %s\n", | |
636 | strerror(errno)); | |
a05f6511 | 637 | return -1; |
9a7b3d91 EB |
638 | } |
639 | dir = opendir(NETNS_RUN_DIR); | |
640 | if (!dir) { | |
641 | /* Succeed treat a missing directory as an empty directory */ | |
642 | if (errno == ENOENT) | |
a05f6511 | 643 | return 0; |
9a7b3d91 EB |
644 | |
645 | fprintf(stderr, "Failed to open directory %s:%s\n", | |
646 | NETNS_RUN_DIR, strerror(errno)); | |
a05f6511 | 647 | return -1; |
9a7b3d91 EB |
648 | } |
649 | ||
56f5daac | 650 | while ((entry = readdir(dir))) { |
ea343669 | 651 | char name_path[PATH_MAX]; |
9a7b3d91 EB |
652 | struct stat st; |
653 | ||
654 | if (strcmp(entry->d_name, ".") == 0) | |
655 | continue; | |
656 | if (strcmp(entry->d_name, "..") == 0) | |
657 | continue; | |
658 | ||
659 | snprintf(name_path, sizeof(name_path), "%s/%s", NETNS_RUN_DIR, | |
660 | entry->d_name); | |
661 | ||
662 | if (stat(name_path, &st) != 0) | |
663 | continue; | |
664 | ||
665 | if ((st.st_dev == netst.st_dev) && | |
666 | (st.st_ino == netst.st_ino)) { | |
18f156bf | 667 | strlcpy(name, entry->d_name, len); |
9a7b3d91 EB |
668 | } |
669 | } | |
670 | closedir(dir); | |
a05f6511 | 671 | return 0; |
0612519e | 672 | |
9a7b3d91 EB |
673 | } |
674 | ||
9c49438a DA |
675 | static int netns_identify(int argc, char **argv) |
676 | { | |
677 | const char *pidstr; | |
678 | char name[256]; | |
679 | int rc; | |
680 | ||
681 | if (argc < 1) { | |
682 | pidstr = "self"; | |
683 | } else if (argc > 1) { | |
684 | fprintf(stderr, "extra arguments specified\n"); | |
685 | return -1; | |
686 | } else { | |
687 | pidstr = argv[0]; | |
688 | if (!is_pid(pidstr)) { | |
689 | fprintf(stderr, "Specified string '%s' is not a pid\n", | |
690 | pidstr); | |
691 | return -1; | |
692 | } | |
693 | } | |
694 | ||
695 | rc = netns_identify_pid(pidstr, name, sizeof(name)); | |
696 | if (!rc) | |
697 | printf("%s\n", name); | |
698 | ||
699 | return rc; | |
700 | } | |
701 | ||
33724939 | 702 | static int on_netns_del(char *nsname, void *arg) |
0dc34c77 | 703 | { |
ea343669 | 704 | char netns_path[PATH_MAX]; |
0dc34c77 | 705 | |
33724939 | 706 | snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, nsname); |
0dc34c77 EB |
707 | umount2(netns_path, MNT_DETACH); |
708 | if (unlink(netns_path) < 0) { | |
14645ec2 | 709 | fprintf(stderr, "Cannot remove namespace file \"%s\": %s\n", |
0dc34c77 | 710 | netns_path, strerror(errno)); |
a05f6511 | 711 | return -1; |
0dc34c77 | 712 | } |
a05f6511 | 713 | return 0; |
0dc34c77 EB |
714 | } |
715 | ||
33724939 VK |
716 | static int netns_delete(int argc, char **argv) |
717 | { | |
718 | if (argc < 1 && !do_all) { | |
719 | fprintf(stderr, "No netns name specified\n"); | |
720 | return -1; | |
721 | } | |
722 | ||
723 | if (do_all) | |
724 | return netns_foreach(on_netns_del, NULL); | |
725 | ||
726 | return on_netns_del(argv[0], NULL); | |
727 | } | |
728 | ||
c1cbb18a | 729 | static int create_netns_dir(void) |
730 | { | |
731 | /* Create the base netns directory if it doesn't exist */ | |
732 | if (mkdir(NETNS_RUN_DIR, S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)) { | |
733 | if (errno != EEXIST) { | |
734 | fprintf(stderr, "mkdir %s failed: %s\n", | |
735 | NETNS_RUN_DIR, strerror(errno)); | |
736 | return -1; | |
737 | } | |
738 | } | |
739 | ||
740 | return 0; | |
741 | } | |
742 | ||
b2e29223 MC |
743 | /* Obtain a FD for the current namespace, so we can reenter it later */ |
744 | static void netns_save(void) | |
745 | { | |
746 | if (saved_netns != -1) | |
747 | return; | |
748 | ||
749 | saved_netns = open("/proc/self/ns/net", O_RDONLY | O_CLOEXEC); | |
750 | if (saved_netns == -1) { | |
751 | perror("Cannot open init namespace"); | |
752 | exit(1); | |
753 | } | |
754 | } | |
755 | ||
756 | static void netns_restore(void) | |
757 | { | |
758 | if (saved_netns == -1) | |
759 | return; | |
760 | ||
761 | if (setns(saved_netns, CLONE_NEWNET)) { | |
762 | perror("setns"); | |
763 | exit(1); | |
764 | } | |
765 | ||
766 | close(saved_netns); | |
767 | saved_netns = -1; | |
768 | } | |
769 | ||
e3dbcb2a | 770 | static int netns_add(int argc, char **argv, bool create) |
0dc34c77 EB |
771 | { |
772 | /* This function creates a new network namespace and | |
773 | * a new mount namespace and bind them into a well known | |
774 | * location in the filesystem based on the name provided. | |
775 | * | |
e3dbcb2a MC |
776 | * If create is true, a new namespace will be created, |
777 | * otherwise an existing one will be attached to the file. | |
778 | * | |
0dc34c77 EB |
779 | * The mount namespace is created so that any necessary |
780 | * userspace tweaks like remounting /sys, or bind mounting | |
e3dbcb2a | 781 | * a new /etc/resolv.conf can be shared between users. |
0dc34c77 | 782 | */ |
e3dbcb2a | 783 | char netns_path[PATH_MAX], proc_path[PATH_MAX]; |
0dc34c77 | 784 | const char *name; |
e3dbcb2a | 785 | pid_t pid; |
223f4d8e | 786 | int fd; |
58a3e827 | 787 | int made_netns_run_dir_mount = 0; |
0dc34c77 | 788 | |
e3dbcb2a MC |
789 | if (create) { |
790 | if (argc < 1) { | |
791 | fprintf(stderr, "No netns name specified\n"); | |
792 | return -1; | |
793 | } | |
794 | } else { | |
795 | if (argc < 2) { | |
796 | fprintf(stderr, "No netns name and PID specified\n"); | |
797 | return -1; | |
798 | } | |
799 | ||
800 | if (get_s32(&pid, argv[1], 0) || !pid) { | |
801 | fprintf(stderr, "Invalid PID: %s\n", argv[1]); | |
802 | return -1; | |
803 | } | |
0dc34c77 EB |
804 | } |
805 | name = argv[0]; | |
806 | ||
807 | snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, name); | |
808 | ||
c1cbb18a | 809 | if (create_netns_dir()) |
810 | return -1; | |
0dc34c77 | 811 | |
d259f030 | 812 | /* Make it possible for network namespace mounts to propagate between |
58a3e827 EB |
813 | * mount namespaces. This makes it likely that a unmounting a network |
814 | * namespace file in one namespace will unmount the network namespace | |
815 | * file in all namespaces allowing the network namespace to be freed | |
816 | * sooner. | |
817 | */ | |
818 | while (mount("", NETNS_RUN_DIR, "none", MS_SHARED | MS_REC, NULL)) { | |
819 | /* Fail unless we need to make the mount point */ | |
820 | if (errno != EINVAL || made_netns_run_dir_mount) { | |
821 | fprintf(stderr, "mount --make-shared %s failed: %s\n", | |
822 | NETNS_RUN_DIR, strerror(errno)); | |
a05f6511 | 823 | return -1; |
58a3e827 EB |
824 | } |
825 | ||
826 | /* Upgrade NETNS_RUN_DIR to a mount point */ | |
d6a4076b | 827 | if (mount(NETNS_RUN_DIR, NETNS_RUN_DIR, "none", MS_BIND | MS_REC, NULL)) { |
58a3e827 EB |
828 | fprintf(stderr, "mount --bind %s %s failed: %s\n", |
829 | NETNS_RUN_DIR, NETNS_RUN_DIR, strerror(errno)); | |
a05f6511 | 830 | return -1; |
58a3e827 EB |
831 | } |
832 | made_netns_run_dir_mount = 1; | |
833 | } | |
834 | ||
0dc34c77 | 835 | /* Create the filesystem state */ |
223f4d8e EB |
836 | fd = open(netns_path, O_RDONLY|O_CREAT|O_EXCL, 0); |
837 | if (fd < 0) { | |
55713c8c | 838 | fprintf(stderr, "Cannot create namespace file \"%s\": %s\n", |
0dc34c77 | 839 | netns_path, strerror(errno)); |
a05f6511 | 840 | return -1; |
0dc34c77 | 841 | } |
223f4d8e | 842 | close(fd); |
e3dbcb2a MC |
843 | |
844 | if (create) { | |
80a931d4 | 845 | netns_save(); |
e3dbcb2a MC |
846 | if (unshare(CLONE_NEWNET) < 0) { |
847 | fprintf(stderr, "Failed to create a new network namespace \"%s\": %s\n", | |
848 | name, strerror(errno)); | |
849 | goto out_delete; | |
850 | } | |
851 | ||
852 | strcpy(proc_path, "/proc/self/ns/net"); | |
853 | } else { | |
854 | snprintf(proc_path, sizeof(proc_path), "/proc/%d/ns/net", pid); | |
0dc34c77 EB |
855 | } |
856 | ||
857 | /* Bind the netns last so I can watch for it */ | |
e3dbcb2a MC |
858 | if (mount(proc_path, netns_path, "none", MS_BIND, NULL) < 0) { |
859 | fprintf(stderr, "Bind %s -> %s failed: %s\n", | |
860 | proc_path, netns_path, strerror(errno)); | |
0dc34c77 EB |
861 | goto out_delete; |
862 | } | |
b2e29223 MC |
863 | netns_restore(); |
864 | ||
a05f6511 | 865 | return 0; |
0dc34c77 | 866 | out_delete: |
e3dbcb2a | 867 | if (create) { |
b2e29223 | 868 | netns_restore(); |
e3dbcb2a MC |
869 | netns_delete(argc, argv); |
870 | } else if (unlink(netns_path) < 0) { | |
871 | fprintf(stderr, "Cannot remove namespace file \"%s\": %s\n", | |
872 | netns_path, strerror(errno)); | |
873 | } | |
a05f6511 | 874 | return -1; |
0dc34c77 EB |
875 | } |
876 | ||
974ef93b | 877 | int set_netnsid_from_name(const char *name, int nsid) |
d182ee13 ND |
878 | { |
879 | struct { | |
880 | struct nlmsghdr n; | |
881 | struct rtgenmsg g; | |
882 | char buf[1024]; | |
d17b136f PS |
883 | } req = { |
884 | .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg)), | |
885 | .n.nlmsg_flags = NLM_F_REQUEST, | |
886 | .n.nlmsg_type = RTM_NEWNSID, | |
887 | .g.rtgen_family = AF_UNSPEC, | |
888 | }; | |
d182ee13 ND |
889 | int fd, err = 0; |
890 | ||
974ef93b ND |
891 | netns_nsid_socket_init(); |
892 | ||
d182ee13 ND |
893 | fd = netns_get_fd(name); |
894 | if (fd < 0) | |
895 | return fd; | |
896 | ||
897 | addattr32(&req.n, 1024, NETNSA_FD, fd); | |
898 | addattr32(&req.n, 1024, NETNSA_NSID, nsid); | |
86bf43c7 | 899 | if (rtnl_talk(&rth, &req.n, NULL) < 0) |
d182ee13 ND |
900 | err = -2; |
901 | ||
902 | close(fd); | |
903 | return err; | |
904 | } | |
905 | ||
906 | static int netns_set(int argc, char **argv) | |
907 | { | |
ea343669 | 908 | char netns_path[PATH_MAX]; |
d182ee13 | 909 | const char *name; |
ebe3ce2f | 910 | int netns, nsid; |
d182ee13 ND |
911 | |
912 | if (argc < 1) { | |
913 | fprintf(stderr, "No netns name specified\n"); | |
914 | return -1; | |
915 | } | |
916 | if (argc < 2) { | |
917 | fprintf(stderr, "No nsid specified\n"); | |
918 | return -1; | |
919 | } | |
920 | name = argv[0]; | |
375d51ca CB |
921 | /* If a negative nsid is specified the kernel will select the nsid. */ |
922 | if (strcmp(argv[1], "auto") == 0) | |
923 | nsid = -1; | |
ebe3ce2f | 924 | else if (get_integer(&nsid, argv[1], 0)) |
acbe9118 | 925 | invarg("Invalid \"netnsid\" value\n", argv[1]); |
ebe3ce2f ND |
926 | else if (nsid < 0) |
927 | invarg("\"netnsid\" value should be >= 0\n", argv[1]); | |
d182ee13 ND |
928 | |
929 | snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, name); | |
930 | netns = open(netns_path, O_RDONLY | O_CLOEXEC); | |
931 | if (netns < 0) { | |
932 | fprintf(stderr, "Cannot open network namespace \"%s\": %s\n", | |
933 | name, strerror(errno)); | |
934 | return -1; | |
935 | } | |
936 | ||
937 | return set_netnsid_from_name(name, nsid); | |
938 | } | |
0dc34c77 EB |
939 | |
940 | static int netns_monitor(int argc, char **argv) | |
941 | { | |
942 | char buf[4096]; | |
943 | struct inotify_event *event; | |
944 | int fd; | |
56f5daac | 945 | |
0dc34c77 EB |
946 | fd = inotify_init(); |
947 | if (fd < 0) { | |
948 | fprintf(stderr, "inotify_init failed: %s\n", | |
949 | strerror(errno)); | |
a05f6511 | 950 | return -1; |
0dc34c77 | 951 | } |
c1cbb18a | 952 | |
953 | if (create_netns_dir()) | |
954 | return -1; | |
955 | ||
0dc34c77 EB |
956 | if (inotify_add_watch(fd, NETNS_RUN_DIR, IN_CREATE | IN_DELETE) < 0) { |
957 | fprintf(stderr, "inotify_add_watch failed: %s\n", | |
958 | strerror(errno)); | |
a05f6511 | 959 | return -1; |
0dc34c77 | 960 | } |
56f5daac | 961 | for (;;) { |
0dc34c77 | 962 | ssize_t len = read(fd, buf, sizeof(buf)); |
56f5daac | 963 | |
0dc34c77 EB |
964 | if (len < 0) { |
965 | fprintf(stderr, "read failed: %s\n", | |
966 | strerror(errno)); | |
a05f6511 | 967 | return -1; |
0dc34c77 EB |
968 | } |
969 | for (event = (struct inotify_event *)buf; | |
970 | (char *)event < &buf[len]; | |
971 | event = (struct inotify_event *)((char *)event + sizeof(*event) + event->len)) { | |
972 | if (event->mask & IN_CREATE) | |
973 | printf("add %s\n", event->name); | |
974 | if (event->mask & IN_DELETE) | |
975 | printf("delete %s\n", event->name); | |
976 | } | |
977 | } | |
a05f6511 | 978 | return 0; |
0dc34c77 EB |
979 | } |
980 | ||
79928fd0 MC |
981 | static int invalid_name(const char *name) |
982 | { | |
d3f0b091 MC |
983 | return !*name || strlen(name) > NAME_MAX || |
984 | strchr(name, '/') || !strcmp(name, ".") || !strcmp(name, ".."); | |
79928fd0 MC |
985 | } |
986 | ||
0dc34c77 EB |
987 | int do_netns(int argc, char **argv) |
988 | { | |
e29a8e05 | 989 | netns_nsid_socket_init(); |
d652ccbf | 990 | |
e29a8e05 AA |
991 | if (argc < 1) { |
992 | netns_map_init(); | |
0dc34c77 | 993 | return netns_list(0, NULL); |
e29a8e05 | 994 | } |
0dc34c77 | 995 | |
b7f28e0b | 996 | if (!do_all && argc > 1 && invalid_name(argv[1])) { |
79928fd0 MC |
997 | fprintf(stderr, "Invalid netns name \"%s\"\n", argv[1]); |
998 | exit(-1); | |
999 | } | |
1000 | ||
0dc34c77 | 1001 | if ((matches(*argv, "list") == 0) || (matches(*argv, "show") == 0) || |
e29a8e05 AA |
1002 | (matches(*argv, "lst") == 0)) { |
1003 | netns_map_init(); | |
0dc34c77 | 1004 | return netns_list(argc-1, argv+1); |
e29a8e05 | 1005 | } |
0dc34c77 | 1006 | |
e29a8e05 AA |
1007 | if ((matches(*argv, "list-id") == 0)) { |
1008 | netns_map_init(); | |
d652ccbf | 1009 | return netns_list_id(argc-1, argv+1); |
e29a8e05 | 1010 | } |
d652ccbf | 1011 | |
0dc34c77 | 1012 | if (matches(*argv, "help") == 0) |
8e2d47dc | 1013 | return usage(); |
0dc34c77 EB |
1014 | |
1015 | if (matches(*argv, "add") == 0) | |
e3dbcb2a | 1016 | return netns_add(argc-1, argv+1, true); |
0dc34c77 | 1017 | |
d182ee13 ND |
1018 | if (matches(*argv, "set") == 0) |
1019 | return netns_set(argc-1, argv+1); | |
1020 | ||
0dc34c77 EB |
1021 | if (matches(*argv, "delete") == 0) |
1022 | return netns_delete(argc-1, argv+1); | |
1023 | ||
9a7b3d91 EB |
1024 | if (matches(*argv, "identify") == 0) |
1025 | return netns_identify(argc-1, argv+1); | |
1026 | ||
1027 | if (matches(*argv, "pids") == 0) | |
1028 | return netns_pids(argc-1, argv+1); | |
1029 | ||
0dc34c77 EB |
1030 | if (matches(*argv, "exec") == 0) |
1031 | return netns_exec(argc-1, argv+1); | |
1032 | ||
1033 | if (matches(*argv, "monitor") == 0) | |
1034 | return netns_monitor(argc-1, argv+1); | |
1035 | ||
e3dbcb2a MC |
1036 | if (matches(*argv, "attach") == 0) |
1037 | return netns_add(argc-1, argv+1, false); | |
1038 | ||
0dc34c77 | 1039 | fprintf(stderr, "Command \"%s\" is unknown, try \"ip netns help\".\n", *argv); |
a05f6511 | 1040 | exit(-1); |
0dc34c77 | 1041 | } |