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