Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 1 | #define _ATFILE_SOURCE |
| 2 | #include <sys/types.h> |
| 3 | #include <sys/stat.h> |
| 4 | #include <sys/wait.h> |
| 5 | #include <sys/inotify.h> |
| 6 | #include <sys/mount.h> |
| 7 | #include <sys/param.h> |
| 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> |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 16 | #include <ctype.h> |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 17 | |
Nicolas Dichtel | d182ee1 | 2015-02-17 17:30:37 +0100 | [diff] [blame] | 18 | #include <linux/net_namespace.h> |
| 19 | |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 20 | #include "utils.h" |
| 21 | #include "ip_common.h" |
Vadim Kochan | eb67e44 | 2014-12-24 23:04:08 +0200 | [diff] [blame] | 22 | #include "namespace.h" |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 23 | |
Eric W. Biederman | 8e2d47d | 2013-01-17 14:46:09 +0000 | [diff] [blame] | 24 | static int usage(void) |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 25 | { |
| 26 | fprintf(stderr, "Usage: ip netns list\n"); |
| 27 | fprintf(stderr, " ip netns add NAME\n"); |
Nicolas Dichtel | d182ee1 | 2015-02-17 17:30:37 +0100 | [diff] [blame] | 28 | fprintf(stderr, " ip netns set NAME NETNSID\n"); |
Vadim Kochan | 3372493 | 2015-01-18 16:10:19 +0200 | [diff] [blame] | 29 | fprintf(stderr, " ip [-all] netns delete [NAME]\n"); |
vadimk | 0948adc | 2014-11-07 18:25:30 +0200 | [diff] [blame] | 30 | fprintf(stderr, " ip netns identify [PID]\n"); |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 31 | fprintf(stderr, " ip netns pids NAME\n"); |
Vadim Kochan | b13ba03 | 2015-01-18 16:10:18 +0200 | [diff] [blame] | 32 | fprintf(stderr, " ip [-all] netns exec [NAME] cmd ...\n"); |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 33 | fprintf(stderr, " ip netns monitor\n"); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 34 | exit(-1); |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 35 | } |
| 36 | |
Nicolas Dichtel | 4c7d9a5 | 2015-04-13 10:34:26 +0200 | [diff] [blame^] | 37 | static int have_rtnl_getnsid = -1; |
| 38 | |
| 39 | static int ipnetns_accept_msg(const struct sockaddr_nl *who, |
| 40 | struct nlmsghdr *n, void *arg) |
| 41 | { |
| 42 | struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(n); |
| 43 | |
| 44 | if (n->nlmsg_type == NLMSG_ERROR && |
| 45 | (err->error == -EOPNOTSUPP || err->error == -EINVAL)) |
| 46 | have_rtnl_getnsid = 0; |
| 47 | else |
| 48 | have_rtnl_getnsid = 1; |
| 49 | return -1; |
| 50 | } |
| 51 | |
| 52 | static int ipnetns_have_nsid(void) |
| 53 | { |
| 54 | struct { |
| 55 | struct nlmsghdr n; |
| 56 | struct rtgenmsg g; |
| 57 | char buf[1024]; |
| 58 | } req; |
| 59 | int fd; |
| 60 | |
| 61 | if (have_rtnl_getnsid < 0) { |
| 62 | memset(&req, 0, sizeof(req)); |
| 63 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg)); |
| 64 | req.n.nlmsg_flags = NLM_F_REQUEST; |
| 65 | req.n.nlmsg_type = RTM_GETNSID; |
| 66 | req.g.rtgen_family = AF_UNSPEC; |
| 67 | |
| 68 | fd = open("/proc/self/ns/net", O_RDONLY); |
| 69 | if (fd < 0) { |
| 70 | perror("open(\"/proc/self/ns/net\")"); |
| 71 | exit(1); |
| 72 | } |
| 73 | |
| 74 | addattr32(&req.n, 1024, NETNSA_FD, fd); |
| 75 | |
| 76 | if (rtnl_send(&rth, &req.n, req.n.nlmsg_len) < 0) { |
| 77 | perror("request send failed"); |
| 78 | exit(1); |
| 79 | } |
| 80 | rtnl_listen(&rth, ipnetns_accept_msg, NULL); |
| 81 | close(fd); |
| 82 | } |
| 83 | |
| 84 | return have_rtnl_getnsid; |
| 85 | } |
| 86 | |
Nicolas Dichtel | d182ee1 | 2015-02-17 17:30:37 +0100 | [diff] [blame] | 87 | static int get_netnsid_from_name(const char *name) |
| 88 | { |
| 89 | struct { |
| 90 | struct nlmsghdr n; |
| 91 | struct rtgenmsg g; |
| 92 | char buf[1024]; |
| 93 | } req, answer; |
| 94 | struct rtattr *tb[NETNSA_MAX + 1]; |
| 95 | struct rtgenmsg *rthdr; |
| 96 | int len, fd; |
| 97 | |
| 98 | memset(&req, 0, sizeof(req)); |
| 99 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg)); |
| 100 | req.n.nlmsg_flags = NLM_F_REQUEST; |
| 101 | req.n.nlmsg_type = RTM_GETNSID; |
| 102 | req.g.rtgen_family = AF_UNSPEC; |
| 103 | |
| 104 | fd = netns_get_fd(name); |
| 105 | if (fd < 0) |
| 106 | return fd; |
| 107 | |
| 108 | addattr32(&req.n, 1024, NETNSA_FD, fd); |
| 109 | if (rtnl_talk(&rth, &req.n, 0, 0, &answer.n) < 0) { |
| 110 | close(fd); |
| 111 | return -2; |
| 112 | } |
| 113 | close(fd); |
| 114 | |
| 115 | /* Validate message and parse attributes */ |
| 116 | if (answer.n.nlmsg_type == NLMSG_ERROR) |
| 117 | return -1; |
| 118 | |
| 119 | rthdr = NLMSG_DATA(&answer.n); |
| 120 | len = answer.n.nlmsg_len - NLMSG_SPACE(sizeof(*rthdr)); |
| 121 | if (len < 0) |
| 122 | return -1; |
| 123 | |
| 124 | parse_rtattr(tb, NETNSA_MAX, NETNS_RTA(rthdr), len); |
| 125 | |
| 126 | if (tb[NETNSA_NSID]) |
| 127 | return rta_getattr_u32(tb[NETNSA_NSID]); |
| 128 | |
| 129 | return -1; |
| 130 | } |
| 131 | |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 132 | static int netns_list(int argc, char **argv) |
| 133 | { |
| 134 | struct dirent *entry; |
| 135 | DIR *dir; |
Nicolas Dichtel | d182ee1 | 2015-02-17 17:30:37 +0100 | [diff] [blame] | 136 | int id; |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 137 | |
| 138 | dir = opendir(NETNS_RUN_DIR); |
| 139 | if (!dir) |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 140 | return 0; |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 141 | |
| 142 | while ((entry = readdir(dir)) != NULL) { |
| 143 | if (strcmp(entry->d_name, ".") == 0) |
| 144 | continue; |
| 145 | if (strcmp(entry->d_name, "..") == 0) |
| 146 | continue; |
Nicolas Dichtel | d182ee1 | 2015-02-17 17:30:37 +0100 | [diff] [blame] | 147 | printf("%s", entry->d_name); |
Nicolas Dichtel | 4c7d9a5 | 2015-04-13 10:34:26 +0200 | [diff] [blame^] | 148 | if (ipnetns_have_nsid()) { |
| 149 | id = get_netnsid_from_name(entry->d_name); |
| 150 | if (id >= 0) |
| 151 | printf(" (id: %d)", id); |
| 152 | } |
Nicolas Dichtel | d182ee1 | 2015-02-17 17:30:37 +0100 | [diff] [blame] | 153 | printf("\n"); |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 154 | } |
| 155 | closedir(dir); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 156 | return 0; |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 157 | } |
| 158 | |
Vadim Kochan | b13ba03 | 2015-01-18 16:10:18 +0200 | [diff] [blame] | 159 | static int cmd_exec(const char *cmd, char **argv, bool do_fork) |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 160 | { |
JunweiZhang | 95592b4 | 2013-07-09 08:55:20 -0700 | [diff] [blame] | 161 | fflush(stdout); |
Vadim Kochan | b13ba03 | 2015-01-18 16:10:18 +0200 | [diff] [blame] | 162 | if (do_fork) { |
JunweiZhang | 95592b4 | 2013-07-09 08:55:20 -0700 | [diff] [blame] | 163 | int status; |
| 164 | pid_t pid; |
| 165 | |
| 166 | pid = fork(); |
| 167 | if (pid < 0) { |
| 168 | perror("fork"); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 169 | exit(1); |
JunweiZhang | 95592b4 | 2013-07-09 08:55:20 -0700 | [diff] [blame] | 170 | } |
| 171 | |
| 172 | if (pid != 0) { |
| 173 | /* Parent */ |
| 174 | if (waitpid(pid, &status, 0) < 0) { |
| 175 | perror("waitpid"); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 176 | exit(1); |
JunweiZhang | 95592b4 | 2013-07-09 08:55:20 -0700 | [diff] [blame] | 177 | } |
| 178 | |
Nicolas Dichtel | 3c61c01 | 2013-08-29 14:29:07 +0200 | [diff] [blame] | 179 | if (WIFEXITED(status)) { |
Vadim Kochan | b13ba03 | 2015-01-18 16:10:18 +0200 | [diff] [blame] | 180 | return WEXITSTATUS(status); |
Nicolas Dichtel | 3c61c01 | 2013-08-29 14:29:07 +0200 | [diff] [blame] | 181 | } |
JunweiZhang | 95592b4 | 2013-07-09 08:55:20 -0700 | [diff] [blame] | 182 | |
Nicolas Dichtel | 3c61c01 | 2013-08-29 14:29:07 +0200 | [diff] [blame] | 183 | exit(1); |
JunweiZhang | 95592b4 | 2013-07-09 08:55:20 -0700 | [diff] [blame] | 184 | } |
| 185 | } |
| 186 | |
Vadim Kochan | b13ba03 | 2015-01-18 16:10:18 +0200 | [diff] [blame] | 187 | if (execvp(cmd, argv) < 0) |
Kees van Reeuwijk | 14645ec | 2013-02-08 03:32:36 +0000 | [diff] [blame] | 188 | fprintf(stderr, "exec of \"%s\" failed: %s\n", |
Vadim Kochan | b13ba03 | 2015-01-18 16:10:18 +0200 | [diff] [blame] | 189 | cmd, strerror(errno)); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 190 | _exit(1); |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 191 | } |
| 192 | |
Vadim Kochan | b13ba03 | 2015-01-18 16:10:18 +0200 | [diff] [blame] | 193 | static int on_netns_exec(char *nsname, void *arg) |
| 194 | { |
| 195 | char **argv = arg; |
| 196 | cmd_exec(argv[1], argv + 1, true); |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | static int netns_exec(int argc, char **argv) |
| 201 | { |
| 202 | /* Setup the proper environment for apps that are not netns |
| 203 | * aware, and execute a program in that environment. |
| 204 | */ |
| 205 | const char *cmd; |
| 206 | |
| 207 | if (argc < 1 && !do_all) { |
| 208 | fprintf(stderr, "No netns name specified\n"); |
| 209 | return -1; |
| 210 | } |
| 211 | if ((argc < 2 && !do_all) || (argc < 1 && do_all)) { |
| 212 | fprintf(stderr, "No command specified\n"); |
| 213 | return -1; |
| 214 | } |
| 215 | |
| 216 | if (do_all) |
| 217 | return do_each_netns(on_netns_exec, --argv, 1); |
| 218 | |
| 219 | if (netns_switch(argv[0])) |
| 220 | return -1; |
| 221 | |
| 222 | /* ip must return the status of the child, |
| 223 | * but do_cmd() will add a minus to this, |
| 224 | * so let's add another one here to cancel it. |
| 225 | */ |
| 226 | cmd = argv[1]; |
| 227 | return -cmd_exec(cmd, argv + 1, !!batch_mode); |
| 228 | } |
| 229 | |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 230 | static int is_pid(const char *str) |
| 231 | { |
| 232 | int ch; |
| 233 | for (; (ch = *str); str++) { |
| 234 | if (!isdigit(ch)) |
| 235 | return 0; |
| 236 | } |
| 237 | return 1; |
| 238 | } |
| 239 | |
| 240 | static int netns_pids(int argc, char **argv) |
| 241 | { |
| 242 | const char *name; |
| 243 | char net_path[MAXPATHLEN]; |
| 244 | int netns; |
| 245 | struct stat netst; |
| 246 | DIR *dir; |
| 247 | struct dirent *entry; |
| 248 | |
| 249 | if (argc < 1) { |
| 250 | fprintf(stderr, "No netns name specified\n"); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 251 | return -1; |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 252 | } |
| 253 | if (argc > 1) { |
| 254 | fprintf(stderr, "extra arguments specified\n"); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 255 | return -1; |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 256 | } |
| 257 | |
| 258 | name = argv[0]; |
| 259 | snprintf(net_path, sizeof(net_path), "%s/%s", NETNS_RUN_DIR, name); |
| 260 | netns = open(net_path, O_RDONLY); |
| 261 | if (netns < 0) { |
| 262 | fprintf(stderr, "Cannot open network namespace: %s\n", |
| 263 | strerror(errno)); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 264 | return -1; |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 265 | } |
| 266 | if (fstat(netns, &netst) < 0) { |
| 267 | fprintf(stderr, "Stat of netns failed: %s\n", |
| 268 | strerror(errno)); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 269 | return -1; |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 270 | } |
| 271 | dir = opendir("/proc/"); |
| 272 | if (!dir) { |
| 273 | fprintf(stderr, "Open of /proc failed: %s\n", |
| 274 | strerror(errno)); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 275 | return -1; |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 276 | } |
| 277 | while((entry = readdir(dir))) { |
| 278 | char pid_net_path[MAXPATHLEN]; |
| 279 | struct stat st; |
| 280 | if (!is_pid(entry->d_name)) |
| 281 | continue; |
| 282 | snprintf(pid_net_path, sizeof(pid_net_path), "/proc/%s/ns/net", |
| 283 | entry->d_name); |
| 284 | if (stat(pid_net_path, &st) != 0) |
| 285 | continue; |
| 286 | if ((st.st_dev == netst.st_dev) && |
| 287 | (st.st_ino == netst.st_ino)) { |
| 288 | printf("%s\n", entry->d_name); |
| 289 | } |
| 290 | } |
| 291 | closedir(dir); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 292 | return 0; |
Stephen Hemminger | 0612519 | 2014-02-17 10:55:31 -0800 | [diff] [blame] | 293 | |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 294 | } |
| 295 | |
| 296 | static int netns_identify(int argc, char **argv) |
| 297 | { |
| 298 | const char *pidstr; |
| 299 | char net_path[MAXPATHLEN]; |
| 300 | int netns; |
| 301 | struct stat netst; |
| 302 | DIR *dir; |
| 303 | struct dirent *entry; |
| 304 | |
| 305 | if (argc < 1) { |
vadimk | 0948adc | 2014-11-07 18:25:30 +0200 | [diff] [blame] | 306 | pidstr = "self"; |
| 307 | } else if (argc > 1) { |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 308 | fprintf(stderr, "extra arguments specified\n"); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 309 | return -1; |
vadimk | 0948adc | 2014-11-07 18:25:30 +0200 | [diff] [blame] | 310 | } else { |
| 311 | pidstr = argv[0]; |
| 312 | if (!is_pid(pidstr)) { |
| 313 | fprintf(stderr, "Specified string '%s' is not a pid\n", |
| 314 | pidstr); |
| 315 | return -1; |
| 316 | } |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 317 | } |
| 318 | |
| 319 | snprintf(net_path, sizeof(net_path), "/proc/%s/ns/net", pidstr); |
| 320 | netns = open(net_path, O_RDONLY); |
| 321 | if (netns < 0) { |
| 322 | fprintf(stderr, "Cannot open network namespace: %s\n", |
| 323 | strerror(errno)); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 324 | return -1; |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 325 | } |
| 326 | if (fstat(netns, &netst) < 0) { |
| 327 | fprintf(stderr, "Stat of netns failed: %s\n", |
| 328 | strerror(errno)); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 329 | return -1; |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 330 | } |
| 331 | dir = opendir(NETNS_RUN_DIR); |
| 332 | if (!dir) { |
| 333 | /* Succeed treat a missing directory as an empty directory */ |
| 334 | if (errno == ENOENT) |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 335 | return 0; |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 336 | |
| 337 | fprintf(stderr, "Failed to open directory %s:%s\n", |
| 338 | NETNS_RUN_DIR, strerror(errno)); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 339 | return -1; |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 340 | } |
| 341 | |
| 342 | while((entry = readdir(dir))) { |
| 343 | char name_path[MAXPATHLEN]; |
| 344 | struct stat st; |
| 345 | |
| 346 | if (strcmp(entry->d_name, ".") == 0) |
| 347 | continue; |
| 348 | if (strcmp(entry->d_name, "..") == 0) |
| 349 | continue; |
| 350 | |
| 351 | snprintf(name_path, sizeof(name_path), "%s/%s", NETNS_RUN_DIR, |
| 352 | entry->d_name); |
| 353 | |
| 354 | if (stat(name_path, &st) != 0) |
| 355 | continue; |
| 356 | |
| 357 | if ((st.st_dev == netst.st_dev) && |
| 358 | (st.st_ino == netst.st_ino)) { |
| 359 | printf("%s\n", entry->d_name); |
| 360 | } |
| 361 | } |
| 362 | closedir(dir); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 363 | return 0; |
Stephen Hemminger | 0612519 | 2014-02-17 10:55:31 -0800 | [diff] [blame] | 364 | |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 365 | } |
| 366 | |
Vadim Kochan | 3372493 | 2015-01-18 16:10:19 +0200 | [diff] [blame] | 367 | static int on_netns_del(char *nsname, void *arg) |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 368 | { |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 369 | char netns_path[MAXPATHLEN]; |
| 370 | |
Vadim Kochan | 3372493 | 2015-01-18 16:10:19 +0200 | [diff] [blame] | 371 | snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, nsname); |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 372 | umount2(netns_path, MNT_DETACH); |
| 373 | if (unlink(netns_path) < 0) { |
Kees van Reeuwijk | 14645ec | 2013-02-08 03:32:36 +0000 | [diff] [blame] | 374 | fprintf(stderr, "Cannot remove namespace file \"%s\": %s\n", |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 375 | netns_path, strerror(errno)); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 376 | return -1; |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 377 | } |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 378 | return 0; |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 379 | } |
| 380 | |
Vadim Kochan | 3372493 | 2015-01-18 16:10:19 +0200 | [diff] [blame] | 381 | static int netns_delete(int argc, char **argv) |
| 382 | { |
| 383 | if (argc < 1 && !do_all) { |
| 384 | fprintf(stderr, "No netns name specified\n"); |
| 385 | return -1; |
| 386 | } |
| 387 | |
| 388 | if (do_all) |
| 389 | return netns_foreach(on_netns_del, NULL); |
| 390 | |
| 391 | return on_netns_del(argv[0], NULL); |
| 392 | } |
| 393 | |
vadimk | c1cbb18 | 2014-08-31 22:45:29 +0300 | [diff] [blame] | 394 | static int create_netns_dir(void) |
| 395 | { |
| 396 | /* Create the base netns directory if it doesn't exist */ |
| 397 | if (mkdir(NETNS_RUN_DIR, S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)) { |
| 398 | if (errno != EEXIST) { |
| 399 | fprintf(stderr, "mkdir %s failed: %s\n", |
| 400 | NETNS_RUN_DIR, strerror(errno)); |
| 401 | return -1; |
| 402 | } |
| 403 | } |
| 404 | |
| 405 | return 0; |
| 406 | } |
| 407 | |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 408 | static int netns_add(int argc, char **argv) |
| 409 | { |
| 410 | /* This function creates a new network namespace and |
| 411 | * a new mount namespace and bind them into a well known |
| 412 | * location in the filesystem based on the name provided. |
| 413 | * |
| 414 | * The mount namespace is created so that any necessary |
| 415 | * userspace tweaks like remounting /sys, or bind mounting |
| 416 | * a new /etc/resolv.conf can be shared between uers. |
| 417 | */ |
| 418 | char netns_path[MAXPATHLEN]; |
| 419 | const char *name; |
Eric W. Biederman | 223f4d8 | 2011-07-15 14:29:41 +0000 | [diff] [blame] | 420 | int fd; |
Eric W. Biederman | 58a3e82 | 2013-01-17 14:47:18 +0000 | [diff] [blame] | 421 | int made_netns_run_dir_mount = 0; |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 422 | |
| 423 | if (argc < 1) { |
| 424 | fprintf(stderr, "No netns name specified\n"); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 425 | return -1; |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 426 | } |
| 427 | name = argv[0]; |
| 428 | |
| 429 | snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, name); |
| 430 | |
vadimk | c1cbb18 | 2014-08-31 22:45:29 +0300 | [diff] [blame] | 431 | if (create_netns_dir()) |
| 432 | return -1; |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 433 | |
Stephen Hemminger | d259f03 | 2013-08-04 15:00:56 -0700 | [diff] [blame] | 434 | /* Make it possible for network namespace mounts to propagate between |
Eric W. Biederman | 58a3e82 | 2013-01-17 14:47:18 +0000 | [diff] [blame] | 435 | * mount namespaces. This makes it likely that a unmounting a network |
| 436 | * namespace file in one namespace will unmount the network namespace |
| 437 | * file in all namespaces allowing the network namespace to be freed |
| 438 | * sooner. |
| 439 | */ |
| 440 | while (mount("", NETNS_RUN_DIR, "none", MS_SHARED | MS_REC, NULL)) { |
| 441 | /* Fail unless we need to make the mount point */ |
| 442 | if (errno != EINVAL || made_netns_run_dir_mount) { |
| 443 | fprintf(stderr, "mount --make-shared %s failed: %s\n", |
| 444 | NETNS_RUN_DIR, strerror(errno)); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 445 | return -1; |
Eric W. Biederman | 58a3e82 | 2013-01-17 14:47:18 +0000 | [diff] [blame] | 446 | } |
| 447 | |
| 448 | /* Upgrade NETNS_RUN_DIR to a mount point */ |
| 449 | if (mount(NETNS_RUN_DIR, NETNS_RUN_DIR, "none", MS_BIND, NULL)) { |
| 450 | fprintf(stderr, "mount --bind %s %s failed: %s\n", |
| 451 | NETNS_RUN_DIR, NETNS_RUN_DIR, strerror(errno)); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 452 | return -1; |
Eric W. Biederman | 58a3e82 | 2013-01-17 14:47:18 +0000 | [diff] [blame] | 453 | } |
| 454 | made_netns_run_dir_mount = 1; |
| 455 | } |
| 456 | |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 457 | /* Create the filesystem state */ |
Eric W. Biederman | 223f4d8 | 2011-07-15 14:29:41 +0000 | [diff] [blame] | 458 | fd = open(netns_path, O_RDONLY|O_CREAT|O_EXCL, 0); |
| 459 | if (fd < 0) { |
Mike Rapoport | 55713c8 | 2014-05-11 12:21:26 +0300 | [diff] [blame] | 460 | fprintf(stderr, "Cannot create namespace file \"%s\": %s\n", |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 461 | netns_path, strerror(errno)); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 462 | return -1; |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 463 | } |
Eric W. Biederman | 223f4d8 | 2011-07-15 14:29:41 +0000 | [diff] [blame] | 464 | close(fd); |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 465 | if (unshare(CLONE_NEWNET) < 0) { |
Kees van Reeuwijk | 14645ec | 2013-02-08 03:32:36 +0000 | [diff] [blame] | 466 | fprintf(stderr, "Failed to create a new network namespace \"%s\": %s\n", |
| 467 | name, strerror(errno)); |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 468 | goto out_delete; |
| 469 | } |
| 470 | |
| 471 | /* Bind the netns last so I can watch for it */ |
| 472 | if (mount("/proc/self/ns/net", netns_path, "none", MS_BIND, NULL) < 0) { |
| 473 | fprintf(stderr, "Bind /proc/self/ns/net -> %s failed: %s\n", |
| 474 | netns_path, strerror(errno)); |
| 475 | goto out_delete; |
| 476 | } |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 477 | return 0; |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 478 | out_delete: |
| 479 | netns_delete(argc, argv); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 480 | return -1; |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 481 | } |
| 482 | |
Nicolas Dichtel | d182ee1 | 2015-02-17 17:30:37 +0100 | [diff] [blame] | 483 | static int set_netnsid_from_name(const char *name, int nsid) |
| 484 | { |
| 485 | struct { |
| 486 | struct nlmsghdr n; |
| 487 | struct rtgenmsg g; |
| 488 | char buf[1024]; |
| 489 | } req; |
| 490 | int fd, err = 0; |
| 491 | |
| 492 | memset(&req, 0, sizeof(req)); |
| 493 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg)); |
| 494 | req.n.nlmsg_flags = NLM_F_REQUEST; |
| 495 | req.n.nlmsg_type = RTM_NEWNSID; |
| 496 | req.g.rtgen_family = AF_UNSPEC; |
| 497 | |
| 498 | fd = netns_get_fd(name); |
| 499 | if (fd < 0) |
| 500 | return fd; |
| 501 | |
| 502 | addattr32(&req.n, 1024, NETNSA_FD, fd); |
| 503 | addattr32(&req.n, 1024, NETNSA_NSID, nsid); |
| 504 | if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0) |
| 505 | err = -2; |
| 506 | |
| 507 | close(fd); |
| 508 | return err; |
| 509 | } |
| 510 | |
| 511 | static int netns_set(int argc, char **argv) |
| 512 | { |
| 513 | char netns_path[MAXPATHLEN]; |
| 514 | const char *name; |
| 515 | int netns, nsid; |
| 516 | |
| 517 | if (argc < 1) { |
| 518 | fprintf(stderr, "No netns name specified\n"); |
| 519 | return -1; |
| 520 | } |
| 521 | if (argc < 2) { |
| 522 | fprintf(stderr, "No nsid specified\n"); |
| 523 | return -1; |
| 524 | } |
| 525 | name = argv[0]; |
| 526 | nsid = atoi(argv[1]); |
| 527 | |
| 528 | snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, name); |
| 529 | netns = open(netns_path, O_RDONLY | O_CLOEXEC); |
| 530 | if (netns < 0) { |
| 531 | fprintf(stderr, "Cannot open network namespace \"%s\": %s\n", |
| 532 | name, strerror(errno)); |
| 533 | return -1; |
| 534 | } |
| 535 | |
| 536 | return set_netnsid_from_name(name, nsid); |
| 537 | } |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 538 | |
| 539 | static int netns_monitor(int argc, char **argv) |
| 540 | { |
| 541 | char buf[4096]; |
| 542 | struct inotify_event *event; |
| 543 | int fd; |
| 544 | fd = inotify_init(); |
| 545 | if (fd < 0) { |
| 546 | fprintf(stderr, "inotify_init failed: %s\n", |
| 547 | strerror(errno)); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 548 | return -1; |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 549 | } |
vadimk | c1cbb18 | 2014-08-31 22:45:29 +0300 | [diff] [blame] | 550 | |
| 551 | if (create_netns_dir()) |
| 552 | return -1; |
| 553 | |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 554 | if (inotify_add_watch(fd, NETNS_RUN_DIR, IN_CREATE | IN_DELETE) < 0) { |
| 555 | fprintf(stderr, "inotify_add_watch failed: %s\n", |
| 556 | strerror(errno)); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 557 | return -1; |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 558 | } |
| 559 | for(;;) { |
| 560 | ssize_t len = read(fd, buf, sizeof(buf)); |
| 561 | if (len < 0) { |
| 562 | fprintf(stderr, "read failed: %s\n", |
| 563 | strerror(errno)); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 564 | return -1; |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 565 | } |
| 566 | for (event = (struct inotify_event *)buf; |
| 567 | (char *)event < &buf[len]; |
| 568 | event = (struct inotify_event *)((char *)event + sizeof(*event) + event->len)) { |
| 569 | if (event->mask & IN_CREATE) |
| 570 | printf("add %s\n", event->name); |
| 571 | if (event->mask & IN_DELETE) |
| 572 | printf("delete %s\n", event->name); |
| 573 | } |
| 574 | } |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 575 | return 0; |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 576 | } |
| 577 | |
| 578 | int do_netns(int argc, char **argv) |
| 579 | { |
| 580 | if (argc < 1) |
| 581 | return netns_list(0, NULL); |
| 582 | |
| 583 | if ((matches(*argv, "list") == 0) || (matches(*argv, "show") == 0) || |
| 584 | (matches(*argv, "lst") == 0)) |
| 585 | return netns_list(argc-1, argv+1); |
| 586 | |
| 587 | if (matches(*argv, "help") == 0) |
Eric W. Biederman | 8e2d47d | 2013-01-17 14:46:09 +0000 | [diff] [blame] | 588 | return usage(); |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 589 | |
| 590 | if (matches(*argv, "add") == 0) |
| 591 | return netns_add(argc-1, argv+1); |
| 592 | |
Nicolas Dichtel | d182ee1 | 2015-02-17 17:30:37 +0100 | [diff] [blame] | 593 | if (matches(*argv, "set") == 0) |
| 594 | return netns_set(argc-1, argv+1); |
| 595 | |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 596 | if (matches(*argv, "delete") == 0) |
| 597 | return netns_delete(argc-1, argv+1); |
| 598 | |
Eric W. Biederman | 9a7b3d9 | 2013-01-17 14:48:15 +0000 | [diff] [blame] | 599 | if (matches(*argv, "identify") == 0) |
| 600 | return netns_identify(argc-1, argv+1); |
| 601 | |
| 602 | if (matches(*argv, "pids") == 0) |
| 603 | return netns_pids(argc-1, argv+1); |
| 604 | |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 605 | if (matches(*argv, "exec") == 0) |
| 606 | return netns_exec(argc-1, argv+1); |
| 607 | |
| 608 | if (matches(*argv, "monitor") == 0) |
| 609 | return netns_monitor(argc-1, argv+1); |
| 610 | |
| 611 | fprintf(stderr, "Command \"%s\" is unknown, try \"ip netns help\".\n", *argv); |
Stephen Hemminger | a05f651 | 2013-07-12 08:43:23 -0700 | [diff] [blame] | 612 | exit(-1); |
Eric W. Biederman | 0dc34c7 | 2011-07-13 09:48:26 -0700 | [diff] [blame] | 613 | } |