mirror of
https://github.com/systemd/systemd
synced 2024-09-16 06:43:18 +00:00
nspawn: introduce an option for specifying network namespace path
Add a new option `--network-namespace-path` to systemd-nspawn to allow users to specify an arbitrary network namespace, e.g. `/run/netns/foo`. Then systemd-nspawn will open the netns file, pass the fd to outer_child, and enter the namespace represented by the fd before running inner_child. ``` $ sudo ip netns add foo $ mount | grep /run/netns/foo nsfs on /run/netns/foo type nsfs (rw) ... $ sudo systemd-nspawn -D /srv/fc27 --network-namespace-path=/run/netns/foo \ /bin/readlink -f /proc/self/ns/net /proc/1/ns/net:[4026532009] ``` Note that the option `--network-namespace-path=` cannot be used together with other network-related options such as `--private-network` so that the options do not conflict with each other. Fixes https://github.com/systemd/systemd/issues/7361
This commit is contained in:
Dongsu Park
Iago López Galeiras
parent
cb9eeb062c
commit
d7bea6b629
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@ -522,6 +522,23 @@
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<option>--drop-capability=</option>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--network-namespace-path=</option></term>
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<listitem><para>Takes the path to a file representing a kernel
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network namespace that the container shall run in. The specified path
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should refer to a (possibly bind-mounted) network namespace file, as
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exposed by the kernel below <filename>/proc/$PID/ns/net</filename>.
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This makes the container enter the given network namespace. One of the
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typical use cases is to give a network namespace under
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<filename>/run/netns</filename> created by <citerefentry
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project='man-pages'><refentrytitle>ip-netns</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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for example, <option>--network-namespace-path=/run/netns/foo</option>.
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Note that this option cannot be used together with other
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network-related options, such as <option>--private-network</option>
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or <option>--network-interface=</option>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--network-interface=</option></term>
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@ -1271,4 +1271,12 @@ struct fib_rule_uid_range {
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# define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
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#endif
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#ifndef NSFS_MAGIC
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#define NSFS_MAGIC 0x6e736673
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#endif
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#ifndef NS_GET_NSTYPE
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#define NS_GET_NSTYPE _IO(0xb7, 0x3)
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#endif
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#include "missing_syscall.h"
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@ -226,6 +226,18 @@ int fd_is_temporary_fs(int fd) {
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return is_temporary_fs(&s);
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}
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int fd_is_network_ns(int fd) {
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int r;
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r = fd_is_fs_type(fd, NSFS_MAGIC);
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if (r <= 0)
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return r;
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r = ioctl(fd, NS_GET_NSTYPE);
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if (r < 0)
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return -errno;
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return r == CLONE_NEWNET;
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}
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int path_is_temporary_fs(const char *path) {
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_cleanup_close_ int fd = -1;
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@ -62,6 +62,7 @@ int path_is_fs_type(const char *path, statfs_f_type_t magic_value);
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bool is_temporary_fs(const struct statfs *s) _pure_;
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int fd_is_temporary_fs(int fd);
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int fd_is_network_ns(int fd);
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int path_is_temporary_fs(const char *path);
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/* Because statfs.t_type can be int on some architectures, we have to cast
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@ -190,6 +190,7 @@ static bool arg_network_veth = false;
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static char **arg_network_veth_extra = NULL;
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static char *arg_network_bridge = NULL;
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static char *arg_network_zone = NULL;
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static char *arg_network_namespace_path = NULL;
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static unsigned long arg_personality = PERSONALITY_INVALID;
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static char *arg_image = NULL;
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static VolatileMode arg_volatile_mode = VOLATILE_NO;
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@ -260,6 +261,9 @@ static void help(void) {
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" and attach it to an existing bridge on the host\n"
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" --network-zone=NAME Similar, but attach the new interface to an\n"
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" an automatically managed bridge interface\n"
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" --network-namespace-path=PATH\n"
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" Set network namespace to the one represented by\n"
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" the specified kernel namespace file node\n"
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" -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n"
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" Expose a container IP port on the host\n"
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" -Z --selinux-context=SECLABEL\n"
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@ -434,6 +438,7 @@ static int parse_argv(int argc, char *argv[]) {
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ARG_NETWORK_BRIDGE,
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ARG_NETWORK_ZONE,
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ARG_NETWORK_VETH_EXTRA,
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ARG_NETWORK_NAMESPACE_PATH,
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ARG_PERSONALITY,
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ARG_VOLATILE,
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ARG_TEMPLATE,
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@ -450,55 +455,56 @@ static int parse_argv(int argc, char *argv[]) {
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "directory", required_argument, NULL, 'D' },
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{ "template", required_argument, NULL, ARG_TEMPLATE },
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{ "ephemeral", no_argument, NULL, 'x' },
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{ "user", required_argument, NULL, 'u' },
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{ "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
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{ "as-pid2", no_argument, NULL, 'a' },
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{ "boot", no_argument, NULL, 'b' },
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{ "uuid", required_argument, NULL, ARG_UUID },
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{ "read-only", no_argument, NULL, ARG_READ_ONLY },
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{ "capability", required_argument, NULL, ARG_CAPABILITY },
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{ "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY },
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{ "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
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{ "bind", required_argument, NULL, ARG_BIND },
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{ "bind-ro", required_argument, NULL, ARG_BIND_RO },
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{ "tmpfs", required_argument, NULL, ARG_TMPFS },
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{ "overlay", required_argument, NULL, ARG_OVERLAY },
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{ "overlay-ro", required_argument, NULL, ARG_OVERLAY_RO },
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{ "machine", required_argument, NULL, 'M' },
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{ "slice", required_argument, NULL, 'S' },
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{ "setenv", required_argument, NULL, 'E' },
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{ "selinux-context", required_argument, NULL, 'Z' },
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{ "selinux-apifs-context", required_argument, NULL, 'L' },
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{ "quiet", no_argument, NULL, 'q' },
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{ "share-system", no_argument, NULL, ARG_SHARE_SYSTEM }, /* not documented */
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{ "register", required_argument, NULL, ARG_REGISTER },
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{ "keep-unit", no_argument, NULL, ARG_KEEP_UNIT },
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{ "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE },
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{ "network-macvlan", required_argument, NULL, ARG_NETWORK_MACVLAN },
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{ "network-ipvlan", required_argument, NULL, ARG_NETWORK_IPVLAN },
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{ "network-veth", no_argument, NULL, 'n' },
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{ "network-veth-extra", required_argument, NULL, ARG_NETWORK_VETH_EXTRA },
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{ "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
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{ "network-zone", required_argument, NULL, ARG_NETWORK_ZONE },
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{ "personality", required_argument, NULL, ARG_PERSONALITY },
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{ "image", required_argument, NULL, 'i' },
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{ "volatile", optional_argument, NULL, ARG_VOLATILE },
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{ "port", required_argument, NULL, 'p' },
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{ "property", required_argument, NULL, ARG_PROPERTY },
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{ "private-users", optional_argument, NULL, ARG_PRIVATE_USERS },
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{ "private-users-chown", optional_argument, NULL, ARG_PRIVATE_USERS_CHOWN },
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{ "kill-signal", required_argument, NULL, ARG_KILL_SIGNAL },
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{ "settings", required_argument, NULL, ARG_SETTINGS },
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{ "chdir", required_argument, NULL, ARG_CHDIR },
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{ "pivot-root", required_argument, NULL, ARG_PIVOT_ROOT },
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{ "notify-ready", required_argument, NULL, ARG_NOTIFY_READY },
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{ "root-hash", required_argument, NULL, ARG_ROOT_HASH },
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{ "system-call-filter", required_argument, NULL, ARG_SYSTEM_CALL_FILTER },
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "directory", required_argument, NULL, 'D' },
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{ "template", required_argument, NULL, ARG_TEMPLATE },
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{ "ephemeral", no_argument, NULL, 'x' },
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{ "user", required_argument, NULL, 'u' },
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{ "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
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{ "as-pid2", no_argument, NULL, 'a' },
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{ "boot", no_argument, NULL, 'b' },
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{ "uuid", required_argument, NULL, ARG_UUID },
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{ "read-only", no_argument, NULL, ARG_READ_ONLY },
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{ "capability", required_argument, NULL, ARG_CAPABILITY },
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{ "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY },
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{ "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
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{ "bind", required_argument, NULL, ARG_BIND },
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{ "bind-ro", required_argument, NULL, ARG_BIND_RO },
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{ "tmpfs", required_argument, NULL, ARG_TMPFS },
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{ "overlay", required_argument, NULL, ARG_OVERLAY },
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{ "overlay-ro", required_argument, NULL, ARG_OVERLAY_RO },
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{ "machine", required_argument, NULL, 'M' },
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{ "slice", required_argument, NULL, 'S' },
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{ "setenv", required_argument, NULL, 'E' },
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{ "selinux-context", required_argument, NULL, 'Z' },
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{ "selinux-apifs-context", required_argument, NULL, 'L' },
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{ "quiet", no_argument, NULL, 'q' },
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{ "share-system", no_argument, NULL, ARG_SHARE_SYSTEM }, /* not documented */
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{ "register", required_argument, NULL, ARG_REGISTER },
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{ "keep-unit", no_argument, NULL, ARG_KEEP_UNIT },
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{ "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE },
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{ "network-macvlan", required_argument, NULL, ARG_NETWORK_MACVLAN },
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{ "network-ipvlan", required_argument, NULL, ARG_NETWORK_IPVLAN },
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{ "network-veth", no_argument, NULL, 'n' },
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{ "network-veth-extra", required_argument, NULL, ARG_NETWORK_VETH_EXTRA },
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{ "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
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{ "network-zone", required_argument, NULL, ARG_NETWORK_ZONE },
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{ "network-namespace-path", required_argument, NULL, ARG_NETWORK_NAMESPACE_PATH },
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{ "personality", required_argument, NULL, ARG_PERSONALITY },
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{ "image", required_argument, NULL, 'i' },
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{ "volatile", optional_argument, NULL, ARG_VOLATILE },
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{ "port", required_argument, NULL, 'p' },
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{ "property", required_argument, NULL, ARG_PROPERTY },
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{ "private-users", optional_argument, NULL, ARG_PRIVATE_USERS },
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{ "private-users-chown", optional_argument, NULL, ARG_PRIVATE_USERS_CHOWN },
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{ "kill-signal", required_argument, NULL, ARG_KILL_SIGNAL },
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{ "settings", required_argument, NULL, ARG_SETTINGS },
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{ "chdir", required_argument, NULL, ARG_CHDIR },
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{ "pivot-root", required_argument, NULL, ARG_PIVOT_ROOT },
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{ "notify-ready", required_argument, NULL, ARG_NOTIFY_READY },
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{ "root-hash", required_argument, NULL, ARG_ROOT_HASH },
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{ "system-call-filter", required_argument, NULL, ARG_SYSTEM_CALL_FILTER },
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{}
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};
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@ -644,6 +650,13 @@ static int parse_argv(int argc, char *argv[]) {
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arg_settings_mask |= SETTING_NETWORK;
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break;
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case ARG_NETWORK_NAMESPACE_PATH:
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r = parse_path_argument_and_warn(optarg, false, &arg_network_namespace_path);
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if (r < 0)
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return r;
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break;
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case 'b':
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if (arg_start_mode == START_PID2) {
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log_error("--boot and --as-pid2 may not be combined.");
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@ -1103,6 +1116,17 @@ static int parse_argv(int argc, char *argv[]) {
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assert_not_reached("Unhandled option");
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}
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/* If --network-namespace-path is given with any other network-related option,
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* we need to error out, to avoid conflicts between different network options. */
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if (arg_network_namespace_path &&
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(arg_network_interfaces || arg_network_macvlan ||
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arg_network_ipvlan || arg_network_veth_extra ||
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arg_network_bridge || arg_network_zone ||
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arg_network_veth || arg_private_network)) {
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log_error("--network-namespace-path cannot be combined with other network options.");
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return -EINVAL;
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}
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parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_IPC", CLONE_NEWIPC);
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parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_PID", CLONE_NEWPID);
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parse_share_ns_env("SYSTEMD_NSPAWN_SHARE_NS_UTS", CLONE_NEWUTS);
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@ -2532,12 +2556,14 @@ static int outer_child(
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int rtnl_socket,
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int uid_shift_socket,
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int unified_cgroup_hierarchy_socket,
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FDSet *fds) {
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FDSet *fds,
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int netns_fd) {
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pid_t pid;
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ssize_t l;
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int r;
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_cleanup_close_ int fd = -1;
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bool create_netns;
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assert(barrier);
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assert(directory);
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@ -2788,9 +2814,11 @@ static int outer_child(
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if (fd < 0)
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return fd;
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create_netns = !arg_network_namespace_path && arg_private_network;
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pid = raw_clone(SIGCHLD|CLONE_NEWNS|
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arg_clone_ns_flags |
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(arg_private_network ? CLONE_NEWNET : 0) |
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(create_netns ? CLONE_NEWNET : 0) |
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(arg_userns_mode != USER_NAMESPACE_NO ? CLONE_NEWUSER : 0));
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if (pid < 0)
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return log_error_errno(errno, "Failed to fork inner child: %m");
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@ -2804,6 +2832,12 @@ static int outer_child(
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* requested, so that we all are owned by the user if
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* user namespaces are turned on. */
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if (arg_network_namespace_path) {
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r = namespace_enter(-1, -1, netns_fd, -1, -1);
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if (r < 0)
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return r;
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}
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r = inner_child(barrier, directory, secondary, kmsg_socket, rtnl_socket, fds);
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if (r < 0)
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_exit(EXIT_FAILURE);
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@ -2836,6 +2870,7 @@ static int outer_child(
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notify_socket = safe_close(notify_socket);
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kmsg_socket = safe_close(kmsg_socket);
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rtnl_socket = safe_close(rtnl_socket);
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netns_fd = safe_close(netns_fd);
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return 0;
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}
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@ -3311,6 +3346,7 @@ static int run(int master,
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int ifi = 0, r;
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ssize_t l;
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sigset_t mask_chld;
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_cleanup_close_ int netns_fd = -1;
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assert_se(sigemptyset(&mask_chld) == 0);
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assert_se(sigaddset(&mask_chld, SIGCHLD) == 0);
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@ -3365,6 +3401,20 @@ static int run(int master,
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if (r < 0)
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return log_error_errno(errno, "Failed to install SIGCHLD handler: %m");
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if (arg_network_namespace_path) {
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netns_fd = open(arg_network_namespace_path, O_RDONLY|O_NOCTTY|O_CLOEXEC);
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if (netns_fd < 0)
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return log_error_errno(errno, "Cannot open file %s: %m", arg_network_namespace_path);
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r = fd_is_network_ns(netns_fd);
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if (r < 0 && r != -ENOTTY)
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return log_error_errno(r, "Failed to check %s fs type: %m", arg_network_namespace_path);
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if (r == 0) {
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log_error("Path %s doesn't refer to a network namespace", arg_network_namespace_path);
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return -EINVAL;
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}
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}
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*pid = raw_clone(SIGCHLD|CLONE_NEWNS);
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if (*pid < 0)
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return log_error_errno(errno, "clone() failed%s: %m",
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@ -3401,7 +3451,8 @@ static int run(int master,
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rtnl_socket_pair[1],
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uid_shift_socket_pair[1],
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unified_cgroup_hierarchy_socket_pair[1],
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fds);
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fds,
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netns_fd);
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if (r < 0)
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_exit(EXIT_FAILURE);
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