#include <errno.h>
#include <unistd.h>
#include <ctype.h>
+#include <linux/limits.h>
+
+#include <linux/net_namespace.h>
#include "utils.h"
+#include "hlist.h"
#include "ip_common.h"
+#include "namespace.h"
+
+static int usage(void)
+{
+ fprintf(stderr, "Usage: ip netns list\n");
+ fprintf(stderr, " ip netns add NAME\n");
+ fprintf(stderr, " ip netns set NAME NETNSID\n");
+ fprintf(stderr, " ip [-all] netns delete [NAME]\n");
+ fprintf(stderr, " ip netns identify [PID]\n");
+ fprintf(stderr, " ip netns pids NAME\n");
+ fprintf(stderr, " ip [-all] netns exec [NAME] cmd ...\n");
+ fprintf(stderr, " ip netns monitor\n");
+ fprintf(stderr, " ip netns list-id\n");
+ exit(-1);
+}
+
+/* This socket is used to get nsid */
+static struct rtnl_handle rtnsh = { .fd = -1 };
+
+static int have_rtnl_getnsid = -1;
+
+static int ipnetns_accept_msg(const struct sockaddr_nl *who,
+ struct nlmsghdr *n, void *arg)
+{
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(n);
-#define NETNS_RUN_DIR "/var/run/netns"
-#define NETNS_ETC_DIR "/etc/netns"
+ if (n->nlmsg_type == NLMSG_ERROR &&
+ (err->error == -EOPNOTSUPP || err->error == -EINVAL))
+ have_rtnl_getnsid = 0;
+ else
+ have_rtnl_getnsid = 1;
+ return -1;
+}
-#ifndef CLONE_NEWNET
-#define CLONE_NEWNET 0x40000000 /* New network namespace (lo, device, names sockets, etc) */
-#endif
+static int ipnetns_have_nsid(void)
+{
+ struct {
+ struct nlmsghdr n;
+ struct rtgenmsg g;
+ char buf[1024];
+ } req;
+ int fd;
-#ifndef MNT_DETACH
-#define MNT_DETACH 0x00000002 /* Just detach from the tree */
-#endif /* MNT_DETACH */
+ if (have_rtnl_getnsid < 0) {
+ memset(&req, 0, sizeof(req));
+ req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
+ req.n.nlmsg_flags = NLM_F_REQUEST;
+ req.n.nlmsg_type = RTM_GETNSID;
+ req.g.rtgen_family = AF_UNSPEC;
-/* sys/mount.h may be out too old to have these */
-#ifndef MS_REC
-#define MS_REC 16384
-#endif
+ fd = open("/proc/self/ns/net", O_RDONLY);
+ if (fd < 0) {
+ perror("open(\"/proc/self/ns/net\")");
+ exit(1);
+ }
-#ifndef MS_SLAVE
-#define MS_SLAVE (1 << 19)
-#endif
+ addattr32(&req.n, 1024, NETNSA_FD, fd);
-#ifndef MS_SHARED
-#define MS_SHARED (1 << 20)
-#endif
+ if (rtnl_send(&rth, &req.n, req.n.nlmsg_len) < 0) {
+ perror("request send failed");
+ exit(1);
+ }
+ rtnl_listen(&rth, ipnetns_accept_msg, NULL);
+ close(fd);
+ }
-#ifndef HAVE_SETNS
-static int setns(int fd, int nstype)
+ return have_rtnl_getnsid;
+}
+
+static int get_netnsid_from_name(const char *name)
{
-#ifdef __NR_setns
- return syscall(__NR_setns, fd, nstype);
-#else
- errno = ENOSYS;
+ struct {
+ struct nlmsghdr n;
+ struct rtgenmsg g;
+ char buf[1024];
+ } req, answer;
+ struct rtattr *tb[NETNSA_MAX + 1];
+ struct rtgenmsg *rthdr;
+ int len, fd;
+
+ memset(&req, 0, sizeof(req));
+ req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
+ req.n.nlmsg_flags = NLM_F_REQUEST;
+ req.n.nlmsg_type = RTM_GETNSID;
+ req.g.rtgen_family = AF_UNSPEC;
+
+ fd = netns_get_fd(name);
+ if (fd < 0)
+ return fd;
+
+ addattr32(&req.n, 1024, NETNSA_FD, fd);
+ if (rtnl_talk(&rtnsh, &req.n, &answer.n, sizeof(answer)) < 0) {
+ close(fd);
+ return -2;
+ }
+ close(fd);
+
+ /* Validate message and parse attributes */
+ if (answer.n.nlmsg_type == NLMSG_ERROR)
+ return -1;
+
+ rthdr = NLMSG_DATA(&answer.n);
+ len = answer.n.nlmsg_len - NLMSG_SPACE(sizeof(*rthdr));
+ if (len < 0)
+ return -1;
+
+ parse_rtattr(tb, NETNSA_MAX, NETNS_RTA(rthdr), len);
+
+ if (tb[NETNSA_NSID])
+ return rta_getattr_u32(tb[NETNSA_NSID]);
+
return -1;
-#endif
}
-#endif /* HAVE_SETNS */
-static int usage(void)
+struct nsid_cache {
+ struct hlist_node nsid_hash;
+ struct hlist_node name_hash;
+ int nsid;
+ char name[NAME_MAX];
+};
+
+#define NSIDMAP_SIZE 128
+#define NSID_HASH_NSID(nsid) (nsid & (NSIDMAP_SIZE - 1))
+#define NSID_HASH_NAME(name) (namehash(name) & (NSIDMAP_SIZE - 1))
+
+static struct hlist_head nsid_head[NSIDMAP_SIZE];
+static struct hlist_head name_head[NSIDMAP_SIZE];
+
+static struct nsid_cache *netns_map_get_by_nsid(int nsid)
{
- fprintf(stderr, "Usage: ip netns list\n");
- fprintf(stderr, " ip netns add NAME\n");
- fprintf(stderr, " ip netns delete NAME\n");
- fprintf(stderr, " ip netns identify PID\n");
- fprintf(stderr, " ip netns pids NAME\n");
- fprintf(stderr, " ip netns exec NAME cmd ...\n");
- fprintf(stderr, " ip netns monitor\n");
- exit(-1);
+ uint32_t h = NSID_HASH_NSID(nsid);
+ struct hlist_node *n;
+
+ hlist_for_each(n, &nsid_head[h]) {
+ struct nsid_cache *c = container_of(n, struct nsid_cache,
+ nsid_hash);
+ if (c->nsid == nsid)
+ return c;
+ }
+
+ return NULL;
}
-int get_netns_fd(const char *name)
+static int netns_map_add(int nsid, char *name)
{
- char pathbuf[MAXPATHLEN];
- const char *path, *ptr;
+ struct nsid_cache *c;
+ uint32_t h;
- path = name;
- ptr = strchr(name, '/');
- if (!ptr) {
- snprintf(pathbuf, sizeof(pathbuf), "%s/%s",
- NETNS_RUN_DIR, name );
- path = pathbuf;
+ if (netns_map_get_by_nsid(nsid) != NULL)
+ return -EEXIST;
+
+ c = malloc(sizeof(*c));
+ if (c == NULL) {
+ perror("malloc");
+ return -ENOMEM;
}
- return open(path, O_RDONLY);
+ c->nsid = nsid;
+ strcpy(c->name, name);
+
+ h = NSID_HASH_NSID(nsid);
+ hlist_add_head(&c->nsid_hash, &nsid_head[h]);
+
+ h = NSID_HASH_NAME(name);
+ hlist_add_head(&c->name_hash, &name_head[h]);
+
+ return 0;
}
-static int netns_list(int argc, char **argv)
+static void netns_map_del(struct nsid_cache *c)
{
+ hlist_del(&c->name_hash);
+ hlist_del(&c->nsid_hash);
+ free(c);
+}
+
+void netns_map_init(void)
+{
+ static int initialized;
struct dirent *entry;
DIR *dir;
+ int nsid;
+
+ if (initialized || !ipnetns_have_nsid())
+ return;
+
+ if (rtnl_open(&rtnsh, 0) < 0) {
+ fprintf(stderr, "Cannot open rtnetlink\n");
+ exit(1);
+ }
dir = opendir(NETNS_RUN_DIR);
if (!dir)
- return 0;
+ return;
while ((entry = readdir(dir)) != NULL) {
if (strcmp(entry->d_name, ".") == 0)
continue;
if (strcmp(entry->d_name, "..") == 0)
continue;
- printf("%s\n", entry->d_name);
+ nsid = get_netnsid_from_name(entry->d_name);
+
+ if (nsid >= 0)
+ netns_map_add(nsid, entry->d_name);
}
closedir(dir);
- return 0;
+ initialized = 1;
}
-static void bind_etc(const char *name)
+static int netns_get_name(int nsid, char *name)
{
- char etc_netns_path[MAXPATHLEN];
- char netns_name[MAXPATHLEN];
- char etc_name[MAXPATHLEN];
struct dirent *entry;
DIR *dir;
+ int id;
- snprintf(etc_netns_path, sizeof(etc_netns_path), "%s/%s", NETNS_ETC_DIR, name);
- dir = opendir(etc_netns_path);
+ dir = opendir(NETNS_RUN_DIR);
if (!dir)
- return;
+ return -ENOENT;
while ((entry = readdir(dir)) != NULL) {
if (strcmp(entry->d_name, ".") == 0)
continue;
if (strcmp(entry->d_name, "..") == 0)
continue;
- snprintf(netns_name, sizeof(netns_name), "%s/%s", etc_netns_path, entry->d_name);
- snprintf(etc_name, sizeof(etc_name), "/etc/%s", entry->d_name);
- if (mount(netns_name, etc_name, "none", MS_BIND, NULL) < 0) {
- fprintf(stderr, "Bind %s -> %s failed: %s\n",
- netns_name, etc_name, strerror(errno));
+ id = get_netnsid_from_name(entry->d_name);
+
+ if (nsid == id) {
+ strcpy(name, entry->d_name);
+ closedir(dir);
+ return 0;
}
}
closedir(dir);
+ return -ENOENT;
}
-static int netns_exec(int argc, char **argv)
+int print_nsid(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
- /* Setup the proper environment for apps that are not netns
- * aware, and execute a program in that environment.
- */
- const char *name, *cmd;
- char net_path[MAXPATHLEN];
- int netns;
+ struct rtgenmsg *rthdr = NLMSG_DATA(n);
+ struct rtattr *tb[NETNSA_MAX+1];
+ int len = n->nlmsg_len;
+ FILE *fp = (FILE *)arg;
+ struct nsid_cache *c;
+ char name[NAME_MAX];
+ int nsid;
+
+ if (n->nlmsg_type != RTM_NEWNSID && n->nlmsg_type != RTM_DELNSID)
+ return 0;
- if (argc < 1) {
- fprintf(stderr, "No netns name specified\n");
- return -1;
- }
- if (argc < 2) {
- fprintf(stderr, "No command specified\n");
+ len -= NLMSG_SPACE(sizeof(*rthdr));
+ if (len < 0) {
+ fprintf(stderr, "BUG: wrong nlmsg len %d in %s\n", len,
+ __func__);
return -1;
}
- name = argv[0];
- cmd = argv[1];
- snprintf(net_path, sizeof(net_path), "%s/%s", NETNS_RUN_DIR, name);
- netns = open(net_path, O_RDONLY | O_CLOEXEC);
- if (netns < 0) {
- fprintf(stderr, "Cannot open network namespace \"%s\": %s\n",
- name, strerror(errno));
+ parse_rtattr(tb, NETNSA_MAX, NETNS_RTA(rthdr), len);
+ if (tb[NETNSA_NSID] == NULL) {
+ fprintf(stderr, "BUG: NETNSA_NSID is missing %s\n", __func__);
return -1;
}
- if (setns(netns, CLONE_NEWNET) < 0) {
- fprintf(stderr, "setting the network namespace \"%s\" failed: %s\n",
- name, strerror(errno));
- return -1;
- }
+ if (n->nlmsg_type == RTM_DELNSID)
+ fprintf(fp, "Deleted ");
- if (unshare(CLONE_NEWNS) < 0) {
- fprintf(stderr, "unshare failed: %s\n", strerror(errno));
- return -1;
+ nsid = rta_getattr_u32(tb[NETNSA_NSID]);
+ fprintf(fp, "nsid %u ", nsid);
+
+ c = netns_map_get_by_nsid(nsid);
+ if (c != NULL) {
+ fprintf(fp, "(iproute2 netns name: %s)", c->name);
+ netns_map_del(c);
}
- /* Don't let any mounts propagate back to the parent */
- if (mount("", "/", "none", MS_SLAVE | MS_REC, NULL)) {
- fprintf(stderr, "\"mount --make-rslave /\" failed: %s\n",
- strerror(errno));
- return -1;
+
+ /* During 'ip monitor nsid', no chance to have new nsid in cache. */
+ if (c == NULL && n->nlmsg_type == RTM_NEWNSID)
+ if (netns_get_name(nsid, name) == 0) {
+ fprintf(fp, "(iproute2 netns name: %s)", name);
+ netns_map_add(nsid, name);
+ }
+
+ fprintf(fp, "\n");
+ fflush(fp);
+ return 0;
+}
+
+static int netns_list_id(int argc, char **argv)
+{
+ if (!ipnetns_have_nsid()) {
+ fprintf(stderr,
+ "RTM_GETNSID is not supported by the kernel.\n");
+ return -ENOTSUP;
}
- /* Mount a version of /sys that describes the network namespace */
- if (umount2("/sys", MNT_DETACH) < 0) {
- fprintf(stderr, "umount of /sys failed: %s\n", strerror(errno));
- return -1;
+
+ if (rtnl_wilddump_request(&rth, AF_UNSPEC, RTM_GETNSID) < 0) {
+ perror("Cannot send dump request");
+ exit(1);
}
- if (mount(name, "/sys", "sysfs", 0, NULL) < 0) {
- fprintf(stderr, "mount of /sys failed: %s\n",strerror(errno));
- return -1;
+ if (rtnl_dump_filter(&rth, print_nsid, stdout) < 0) {
+ fprintf(stderr, "Dump terminated\n");
+ exit(1);
}
+ return 0;
+}
- /* Setup bind mounts for config files in /etc */
- bind_etc(name);
+static int netns_list(int argc, char **argv)
+{
+ struct dirent *entry;
+ DIR *dir;
+ int id;
- fflush(stdout);
+ dir = opendir(NETNS_RUN_DIR);
+ if (!dir)
+ return 0;
+
+ while ((entry = readdir(dir)) != NULL) {
+ if (strcmp(entry->d_name, ".") == 0)
+ continue;
+ if (strcmp(entry->d_name, "..") == 0)
+ continue;
+ printf("%s", entry->d_name);
+ if (ipnetns_have_nsid()) {
+ id = get_netnsid_from_name(entry->d_name);
+ if (id >= 0)
+ printf(" (id: %d)", id);
+ }
+ printf("\n");
+ }
+ closedir(dir);
+ return 0;
+}
- if (batch_mode) {
+static int cmd_exec(const char *cmd, char **argv, bool do_fork)
+{
+ fflush(stdout);
+ if (do_fork) {
int status;
pid_t pid;
}
if (WIFEXITED(status)) {
- /* ip must return the status of the child,
- * but do_cmd() will add a minus to this,
- * so let's add another one here to cancel it.
- */
- return -WEXITSTATUS(status);
+ return WEXITSTATUS(status);
}
exit(1);
}
}
- if (execvp(cmd, argv + 1) < 0)
+ if (execvp(cmd, argv) < 0)
fprintf(stderr, "exec of \"%s\" failed: %s\n",
- cmd, strerror(errno));
+ cmd, strerror(errno));
_exit(1);
}
+static int on_netns_exec(char *nsname, void *arg)
+{
+ char **argv = arg;
+ cmd_exec(argv[1], argv + 1, true);
+ return 0;
+}
+
+static int netns_exec(int argc, char **argv)
+{
+ /* Setup the proper environment for apps that are not netns
+ * aware, and execute a program in that environment.
+ */
+ const char *cmd;
+
+ if (argc < 1 && !do_all) {
+ fprintf(stderr, "No netns name specified\n");
+ return -1;
+ }
+ if ((argc < 2 && !do_all) || (argc < 1 && do_all)) {
+ fprintf(stderr, "No command specified\n");
+ return -1;
+ }
+
+ if (do_all)
+ return do_each_netns(on_netns_exec, --argv, 1);
+
+ if (netns_switch(argv[0]))
+ return -1;
+
+ /* ip must return the status of the child,
+ * but do_cmd() will add a minus to this,
+ * so let's add another one here to cancel it.
+ */
+ cmd = argv[1];
+ return -cmd_exec(cmd, argv + 1, !!batch_mode);
+}
+
static int is_pid(const char *str)
{
int ch;
struct dirent *entry;
if (argc < 1) {
- fprintf(stderr, "No pid specified\n");
- return -1;
- }
- if (argc > 1) {
+ pidstr = "self";
+ } else if (argc > 1) {
fprintf(stderr, "extra arguments specified\n");
return -1;
- }
- pidstr = argv[0];
-
- if (!is_pid(pidstr)) {
- fprintf(stderr, "Specified string '%s' is not a pid\n",
- pidstr);
- return -1;
+ } else {
+ pidstr = argv[0];
+ if (!is_pid(pidstr)) {
+ fprintf(stderr, "Specified string '%s' is not a pid\n",
+ pidstr);
+ return -1;
+ }
}
snprintf(net_path, sizeof(net_path), "/proc/%s/ns/net", pidstr);
}
-static int netns_delete(int argc, char **argv)
+static int on_netns_del(char *nsname, void *arg)
{
- const char *name;
char netns_path[MAXPATHLEN];
- if (argc < 1) {
- fprintf(stderr, "No netns name specified\n");
- return -1;
- }
-
- name = argv[0];
- snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, name);
+ snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, nsname);
umount2(netns_path, MNT_DETACH);
if (unlink(netns_path) < 0) {
fprintf(stderr, "Cannot remove namespace file \"%s\": %s\n",
return 0;
}
+static int netns_delete(int argc, char **argv)
+{
+ if (argc < 1 && !do_all) {
+ fprintf(stderr, "No netns name specified\n");
+ return -1;
+ }
+
+ if (do_all)
+ return netns_foreach(on_netns_del, NULL);
+
+ return on_netns_del(argv[0], NULL);
+}
+
static int create_netns_dir(void)
{
/* Create the base netns directory if it doesn't exist */
return -1;
}
+static int set_netnsid_from_name(const char *name, int nsid)
+{
+ struct {
+ struct nlmsghdr n;
+ struct rtgenmsg g;
+ char buf[1024];
+ } req;
+ int fd, err = 0;
+
+ memset(&req, 0, sizeof(req));
+ req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
+ req.n.nlmsg_flags = NLM_F_REQUEST;
+ req.n.nlmsg_type = RTM_NEWNSID;
+ req.g.rtgen_family = AF_UNSPEC;
+
+ fd = netns_get_fd(name);
+ if (fd < 0)
+ return fd;
+
+ addattr32(&req.n, 1024, NETNSA_FD, fd);
+ addattr32(&req.n, 1024, NETNSA_NSID, nsid);
+ if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
+ err = -2;
+
+ close(fd);
+ return err;
+}
+
+static int netns_set(int argc, char **argv)
+{
+ char netns_path[MAXPATHLEN];
+ const char *name;
+ int netns, nsid;
+
+ if (argc < 1) {
+ fprintf(stderr, "No netns name specified\n");
+ return -1;
+ }
+ if (argc < 2) {
+ fprintf(stderr, "No nsid specified\n");
+ return -1;
+ }
+ name = argv[0];
+ nsid = atoi(argv[1]);
+
+ snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, name);
+ netns = open(netns_path, O_RDONLY | O_CLOEXEC);
+ if (netns < 0) {
+ fprintf(stderr, "Cannot open network namespace \"%s\": %s\n",
+ name, strerror(errno));
+ return -1;
+ }
+
+ return set_netnsid_from_name(name, nsid);
+}
static int netns_monitor(int argc, char **argv)
{
int do_netns(int argc, char **argv)
{
+ netns_map_init();
+
if (argc < 1)
return netns_list(0, NULL);
(matches(*argv, "lst") == 0))
return netns_list(argc-1, argv+1);
+ if ((matches(*argv, "list-id") == 0))
+ return netns_list_id(argc-1, argv+1);
+
if (matches(*argv, "help") == 0)
return usage();
if (matches(*argv, "add") == 0)
return netns_add(argc-1, argv+1);
+ if (matches(*argv, "set") == 0)
+ return netns_set(argc-1, argv+1);
+
if (matches(*argv, "delete") == 0)
return netns_delete(argc-1, argv+1);
projects / mirror_iproute2.git / blobdiff