+/* SPDX-License-Identifier: GPL-2.0 */
#define _ATFILE_SOURCE
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/inotify.h>
#include <sys/mount.h>
-#include <sys/param.h>
#include <sys/syscall.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <ctype.h>
+#include <linux/limits.h>
+
+#include <linux/net_namespace.h>
#include "utils.h"
+#include "list.h"
#include "ip_common.h"
#include "namespace.h"
+#include "json_print.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");
+ fprintf(stderr, "NETNSID := auto | POSITIVE-INT\n");
exit(-1);
}
-static int netns_list(int argc, char **argv)
+/* 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(struct rtnl_ctrl_data *ctrl,
+ struct nlmsghdr *n, void *arg)
+{
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(n);
+
+ if (n->nlmsg_type == NLMSG_ERROR &&
+ (err->error == -EOPNOTSUPP || err->error == -EINVAL))
+ have_rtnl_getnsid = 0;
+ else
+ have_rtnl_getnsid = 1;
+ return -1;
+}
+
+static int ipnetns_have_nsid(void)
{
+ struct {
+ struct nlmsghdr n;
+ struct rtgenmsg g;
+ char buf[1024];
+ } req = {
+ .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
+ .n.nlmsg_flags = NLM_F_REQUEST,
+ .n.nlmsg_type = RTM_GETNSID,
+ .g.rtgen_family = AF_UNSPEC,
+ };
+ int fd;
+
+ if (have_rtnl_getnsid < 0) {
+ fd = open("/proc/self/ns/net", O_RDONLY);
+ if (fd < 0) {
+ have_rtnl_getnsid = 0;
+ return 0;
+ }
+
+ addattr32(&req.n, 1024, NETNSA_FD, fd);
+
+ 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);
+ }
+
+ return have_rtnl_getnsid;
+}
+
+int get_netnsid_from_name(const char *name)
+{
+ struct {
+ struct nlmsghdr n;
+ struct rtgenmsg g;
+ char buf[1024];
+ } req = {
+ .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
+ .n.nlmsg_flags = NLM_F_REQUEST,
+ .n.nlmsg_type = RTM_GETNSID,
+ .g.rtgen_family = AF_UNSPEC,
+ };
+ struct nlmsghdr *answer;
+ struct rtattr *tb[NETNSA_MAX + 1];
+ struct rtgenmsg *rthdr;
+ int len, fd;
+
+ netns_nsid_socket_init();
+
+ fd = netns_get_fd(name);
+ if (fd < 0)
+ return fd;
+
+ addattr32(&req.n, 1024, NETNSA_FD, fd);
+ if (rtnl_talk(&rtnsh, &req.n, &answer) < 0) {
+ close(fd);
+ return -2;
+ }
+ close(fd);
+
+ /* Validate message and parse attributes */
+ if (answer->nlmsg_type == NLMSG_ERROR)
+ goto err_out;
+
+ rthdr = NLMSG_DATA(answer);
+ len = answer->nlmsg_len - NLMSG_SPACE(sizeof(*rthdr));
+ if (len < 0)
+ goto err_out;
+
+ parse_rtattr(tb, NETNSA_MAX, NETNS_RTA(rthdr), len);
+
+ if (tb[NETNSA_NSID]) {
+ free(answer);
+ return rta_getattr_u32(tb[NETNSA_NSID]);
+ }
+
+err_out:
+ free(answer);
+ return -1;
+}
+
+struct nsid_cache {
+ struct hlist_node nsid_hash;
+ struct hlist_node name_hash;
+ int nsid;
+ char name[0];
+};
+
+#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)
+{
+ 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;
+}
+
+char *get_name_from_nsid(int nsid)
+{
+ struct nsid_cache *c;
+
+ netns_nsid_socket_init();
+ netns_map_init();
+
+ c = netns_map_get_by_nsid(nsid);
+ if (c)
+ return c->name;
+
+ return NULL;
+}
+
+static int netns_map_add(int nsid, const char *name)
+{
+ struct nsid_cache *c;
+ uint32_t h;
+
+ if (netns_map_get_by_nsid(nsid) != NULL)
+ return -EEXIST;
+
+ c = malloc(sizeof(*c) + strlen(name) + 1);
+ if (c == NULL) {
+ perror("malloc");
+ return -ENOMEM;
+ }
+ 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 void netns_map_del(struct nsid_cache *c)
+{
+ hlist_del(&c->name_hash);
+ hlist_del(&c->nsid_hash);
+ free(c);
+}
+
+void netns_nsid_socket_init(void)
+{
+ if (rtnsh.fd > -1 || !ipnetns_have_nsid())
+ return;
+
+ if (rtnl_open(&rtnsh, 0) < 0) {
+ fprintf(stderr, "Cannot open rtnetlink\n");
+ exit(1);
+ }
+
+}
+
+void netns_map_init(void)
+{
+ static int initialized;
struct dirent *entry;
DIR *dir;
+ int nsid;
+
+ if (initialized || !ipnetns_have_nsid())
+ return;
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 int cmd_exec(const char *cmd, char **argv, bool do_fork)
+static int netns_get_name(int nsid, char *name)
{
- fflush(stdout);
- if (do_fork) {
- int status;
- pid_t pid;
-
- pid = fork();
- if (pid < 0) {
- perror("fork");
- exit(1);
+ struct dirent *entry;
+ DIR *dir;
+ int id;
+
+ dir = opendir(NETNS_RUN_DIR);
+ if (!dir)
+ return -ENOENT;
+
+ while ((entry = readdir(dir)) != NULL) {
+ if (strcmp(entry->d_name, ".") == 0)
+ continue;
+ if (strcmp(entry->d_name, "..") == 0)
+ continue;
+ id = get_netnsid_from_name(entry->d_name);
+
+ if (nsid == id) {
+ strcpy(name, entry->d_name);
+ closedir(dir);
+ return 0;
}
+ }
+ closedir(dir);
+ return -ENOENT;
+}
+
+int print_nsid(struct nlmsghdr *n, void *arg)
+{
+ 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;
+
+ len -= NLMSG_SPACE(sizeof(*rthdr));
+ if (len < 0) {
+ fprintf(stderr, "BUG: wrong nlmsg len %d in %s\n", len,
+ __func__);
+ return -1;
+ }
- if (pid != 0) {
- /* Parent */
- if (waitpid(pid, &status, 0) < 0) {
- perror("waitpid");
- exit(1);
- }
+ 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 (WIFEXITED(status)) {
- return WEXITSTATUS(status);
- }
+ open_json_object(NULL);
+ if (n->nlmsg_type == RTM_DELNSID)
+ print_bool(PRINT_ANY, "deleted", "Deleted ", true);
- exit(1);
+ nsid = rta_getattr_u32(tb[NETNSA_NSID]);
+ print_uint(PRINT_ANY, "nsid", "nsid %u ", nsid);
+
+ c = netns_map_get_by_nsid(nsid);
+ if (c != NULL) {
+ print_string(PRINT_ANY, "name",
+ "(iproute2 netns name: %s)", c->name);
+ netns_map_del(c);
+ }
+
+ /* 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) {
+ print_string(PRINT_ANY, "name",
+ "(iproute2 netns name: %s)", name);
+ netns_map_add(nsid, name);
}
+
+ print_string(PRINT_FP, NULL, "\n", NULL);
+ close_json_object();
+ 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;
}
- if (execvp(cmd, argv) < 0)
- fprintf(stderr, "exec of \"%s\" failed: %s\n",
- cmd, strerror(errno));
- _exit(1);
+ if (rtnl_nsiddump_req(&rth, AF_UNSPEC) < 0) {
+ perror("Cannot send dump request");
+ exit(1);
+ }
+
+ new_json_obj(json);
+ if (rtnl_dump_filter(&rth, print_nsid, stdout) < 0) {
+ delete_json_obj();
+ fprintf(stderr, "Dump terminated\n");
+ exit(1);
+ }
+ delete_json_obj();
+ return 0;
+}
+
+static int netns_list(int argc, char **argv)
+{
+ struct dirent *entry;
+ DIR *dir;
+ int id;
+
+ dir = opendir(NETNS_RUN_DIR);
+ if (!dir)
+ return 0;
+
+ new_json_obj(json);
+ while ((entry = readdir(dir)) != NULL) {
+ if (strcmp(entry->d_name, ".") == 0)
+ continue;
+ if (strcmp(entry->d_name, "..") == 0)
+ continue;
+
+ open_json_object(NULL);
+ print_string(PRINT_ANY, "name",
+ "%s", entry->d_name);
+ if (ipnetns_have_nsid()) {
+ id = get_netnsid_from_name(entry->d_name);
+ if (id >= 0)
+ print_uint(PRINT_ANY, "id",
+ " (id: %d)", id);
+ }
+ print_string(PRINT_FP, NULL, "\n", NULL);
+ close_json_object();
+ }
+ closedir(dir);
+ delete_json_obj();
+ return 0;
}
static int on_netns_exec(char *nsname, void *arg)
{
char **argv = arg;
+
cmd_exec(argv[1], argv + 1, true);
return 0;
}
if (netns_switch(argv[0]))
return -1;
+ /* we just changed namespaces. clear any vrf association
+ * with prior namespace before exec'ing command
+ */
+ vrf_reset();
+
/* 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.
static int is_pid(const char *str)
{
int ch;
+
for (; (ch = *str); str++) {
if (!isdigit(ch))
return 0;
static int netns_pids(int argc, char **argv)
{
const char *name;
- char net_path[MAXPATHLEN];
+ char net_path[PATH_MAX];
int netns;
struct stat netst;
DIR *dir;
strerror(errno));
return -1;
}
- while((entry = readdir(dir))) {
- char pid_net_path[MAXPATHLEN];
+ while ((entry = readdir(dir))) {
+ char pid_net_path[PATH_MAX];
struct stat st;
+
if (!is_pid(entry->d_name))
continue;
snprintf(pid_net_path, sizeof(pid_net_path), "/proc/%s/ns/net",
}
-static int netns_identify(int argc, char **argv)
+int netns_identify_pid(const char *pidstr, char *name, int len)
{
- const char *pidstr;
- char net_path[MAXPATHLEN];
+ char net_path[PATH_MAX];
int netns;
struct stat netst;
DIR *dir;
struct dirent *entry;
- if (argc < 1) {
- pidstr = "self";
- } else if (argc > 1) {
- fprintf(stderr, "extra arguments specified\n");
- return -1;
- } else {
- pidstr = argv[0];
- if (!is_pid(pidstr)) {
- fprintf(stderr, "Specified string '%s' is not a pid\n",
- pidstr);
- return -1;
- }
- }
+ name[0] = '\0';
snprintf(net_path, sizeof(net_path), "/proc/%s/ns/net", pidstr);
netns = open(net_path, O_RDONLY);
return -1;
}
- while((entry = readdir(dir))) {
- char name_path[MAXPATHLEN];
+ while ((entry = readdir(dir))) {
+ char name_path[PATH_MAX];
struct stat st;
if (strcmp(entry->d_name, ".") == 0)
if ((st.st_dev == netst.st_dev) &&
(st.st_ino == netst.st_ino)) {
- printf("%s\n", entry->d_name);
+ strlcpy(name, entry->d_name, len);
}
}
closedir(dir);
}
+static int netns_identify(int argc, char **argv)
+{
+ const char *pidstr;
+ char name[256];
+ int rc;
+
+ if (argc < 1) {
+ pidstr = "self";
+ } else if (argc > 1) {
+ fprintf(stderr, "extra arguments specified\n");
+ return -1;
+ } else {
+ pidstr = argv[0];
+ if (!is_pid(pidstr)) {
+ fprintf(stderr, "Specified string '%s' is not a pid\n",
+ pidstr);
+ return -1;
+ }
+ }
+
+ rc = netns_identify_pid(pidstr, name, sizeof(name));
+ if (!rc)
+ printf("%s\n", name);
+
+ return rc;
+}
+
static int on_netns_del(char *nsname, void *arg)
{
- char netns_path[MAXPATHLEN];
+ char netns_path[PATH_MAX];
snprintf(netns_path, sizeof(netns_path), "%s/%s", NETNS_RUN_DIR, nsname);
umount2(netns_path, MNT_DETACH);
* userspace tweaks like remounting /sys, or bind mounting
* a new /etc/resolv.conf can be shared between uers.
*/
- char netns_path[MAXPATHLEN];
+ char netns_path[PATH_MAX];
const char *name;
int fd;
int made_netns_run_dir_mount = 0;
}
/* Upgrade NETNS_RUN_DIR to a mount point */
- if (mount(NETNS_RUN_DIR, NETNS_RUN_DIR, "none", MS_BIND, NULL)) {
+ if (mount(NETNS_RUN_DIR, NETNS_RUN_DIR, "none", MS_BIND | MS_REC, NULL)) {
fprintf(stderr, "mount --bind %s %s failed: %s\n",
NETNS_RUN_DIR, NETNS_RUN_DIR, strerror(errno));
return -1;
return -1;
}
+int set_netnsid_from_name(const char *name, int nsid)
+{
+ struct {
+ struct nlmsghdr n;
+ struct rtgenmsg g;
+ char buf[1024];
+ } req = {
+ .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg)),
+ .n.nlmsg_flags = NLM_F_REQUEST,
+ .n.nlmsg_type = RTM_NEWNSID,
+ .g.rtgen_family = AF_UNSPEC,
+ };
+ int fd, err = 0;
+
+ netns_nsid_socket_init();
+
+ 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)
+ err = -2;
+
+ close(fd);
+ return err;
+}
+
+static int netns_set(int argc, char **argv)
+{
+ char netns_path[PATH_MAX];
+ 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];
+ /* If a negative nsid is specified the kernel will select the nsid. */
+ if (strcmp(argv[1], "auto") == 0)
+ nsid = -1;
+ else if (get_integer(&nsid, argv[1], 0))
+ invarg("Invalid \"netnsid\" value\n", argv[1]);
+ else if (nsid < 0)
+ invarg("\"netnsid\" value should be >= 0\n", 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)
{
char buf[4096];
struct inotify_event *event;
int fd;
+
fd = inotify_init();
if (fd < 0) {
fprintf(stderr, "inotify_init failed: %s\n",
strerror(errno));
return -1;
}
- for(;;) {
+ for (;;) {
ssize_t len = read(fd, buf, sizeof(buf));
+
if (len < 0) {
fprintf(stderr, "read failed: %s\n",
strerror(errno));
return 0;
}
+static int invalid_name(const char *name)
+{
+ return !*name || strlen(name) > NAME_MAX ||
+ strchr(name, '/') || !strcmp(name, ".") || !strcmp(name, "..");
+}
+
int do_netns(int argc, char **argv)
{
- if (argc < 1)
+ netns_nsid_socket_init();
+
+ if (argc < 1) {
+ netns_map_init();
return netns_list(0, NULL);
+ }
+
+ if (argc > 1 && invalid_name(argv[1])) {
+ fprintf(stderr, "Invalid netns name \"%s\"\n", argv[1]);
+ exit(-1);
+ }
if ((matches(*argv, "list") == 0) || (matches(*argv, "show") == 0) ||
- (matches(*argv, "lst") == 0))
+ (matches(*argv, "lst") == 0)) {
+ netns_map_init();
return netns_list(argc-1, argv+1);
+ }
+
+ if ((matches(*argv, "list-id") == 0)) {
+ netns_map_init();
+ 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