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-rw-r--r--man/systemd-nspawn.xml127
-rw-r--r--src/nspawn/nspawn.c155
2 files changed, 213 insertions, 69 deletions
diff --git a/man/systemd-nspawn.xml b/man/systemd-nspawn.xml
index ffd707092c..d6f2d11dcc 100644
--- a/man/systemd-nspawn.xml
+++ b/man/systemd-nspawn.xml
@@ -174,6 +174,17 @@
</varlistentry>
<varlistentry>
+ <term><option>-q</option></term>
+ <term><option>--quiet</option></term>
+
+ <listitem><para>Turns off any status
+ output by the tool itself. When this
+ switch is used, then the only output
+ by nspawn will be the console output
+ of the container OS itself.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
<term><option>-D</option></term>
<term><option>--directory=</option></term>
@@ -229,37 +240,6 @@
</varlistentry>
<varlistentry>
- <term><option>--slice=</option></term>
-
- <listitem><para>Make the container
- part of the specified slice, instead
- of the
- <filename>machine.slice</filename>.</para>
- </listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>-Z</option></term>
- <term><option>--selinux-context=</option></term>
-
- <listitem><para>Sets the SELinux
- security context to be used to label
- processes in the container.</para>
- </listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>-L</option></term>
- <term><option>--selinux-apifs-context=</option></term>
-
- <listitem><para>Sets the SELinux security
- context to be used to label files in
- the virtual API file systems in the
- container.</para>
- </listitem>
- </varlistentry>
-
- <varlistentry>
<term><option>--uuid=</option></term>
<listitem><para>Set the specified UUID
@@ -271,15 +251,27 @@
</varlistentry>
<varlistentry>
+ <term><option>--slice=</option></term>
+
+ <listitem><para>Make the container
+ part of the specified slice, instead
+ of the default
+ <filename>machine.slice</filename>.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
<term><option>--private-network</option></term>
- <listitem><para>Turn off networking in
- the container. This makes all network
- interfaces unavailable in the
- container, with the exception of the
- loopback device and those specified
- with
- <option>--network-interface=</option>. If
+ <listitem><para>Disconnect networking
+ of the container from the host. This
+ makes all network interfaces
+ unavailable in the container, with the
+ exception of the loopback device and
+ those specified with
+ <option>--network-interface=</option>
+ and configured ith
+ <option>--network-veth</option>. If
this option is specified the
CAP_NET_ADMIN capability will be added
to the set of capabilities the
@@ -308,11 +300,43 @@
</varlistentry>
<varlistentry>
- <term><option>--read-only</option></term>
+ <term><option>--network-veth</option></term>
+
+ <listitem><para>Create a virtual
+ ethernet link between host and
+ container. The host side of the
+ ethernet link will be available as
+ network interface named after the
+ container's name (as specified with
+ <option>--machine=</option>), prefixed
+ with <literal>ve-</literal>. The
+ container side of the the ethernet
+ link will be named
+ <literal>host0</literal>. Note that
+ <option>--network-veth</option>
+ implies
+ <option>--private-network</option>.</para></listitem>
+ </varlistentry>
- <listitem><para>Mount the root file
- system read-only for the
- container.</para></listitem>
+ <varlistentry>
+ <term><option>-Z</option></term>
+ <term><option>--selinux-context=</option></term>
+
+ <listitem><para>Sets the SELinux
+ security context to be used to label
+ processes in the container.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>-L</option></term>
+ <term><option>--selinux-apifs-context=</option></term>
+
+ <listitem><para>Sets the SELinux security
+ context to be used to label files in
+ the virtual API file systems in the
+ container.</para>
+ </listitem>
</varlistentry>
<varlistentry>
@@ -406,6 +430,14 @@
</varlistentry>
<varlistentry>
+ <term><option>--read-only</option></term>
+
+ <listitem><para>Mount the root file
+ system read-only for the
+ container.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
<term><option>--bind=</option></term>
<term><option>--bind-ro=</option></term>
@@ -440,17 +472,6 @@
</varlistentry>
<varlistentry>
- <term><option>-q</option></term>
- <term><option>--quiet</option></term>
-
- <listitem><para>Turns off any status
- output by the tool itself. When this
- switch is used, then the only output
- by nspawn will be the console output
- of the container OS itself.</para></listitem>
- </varlistentry>
-
- <varlistentry>
<term><option>--share-system</option></term>
<listitem><para>Allows the container
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index abcee3fb98..b4c5a54944 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -43,6 +43,7 @@
#include <linux/rtnetlink.h>
#include <sys/eventfd.h>
#include <net/if.h>
+#include <linux/veth.h>
#ifdef HAVE_SELINUX
#include <selinux/selinux.h>
@@ -128,6 +129,7 @@ static bool arg_share_system = false;
static bool arg_register = true;
static bool arg_keep_unit = false;
static char **arg_network_interfaces = NULL;
+static bool arg_network_veth = false;
static int help(void) {
@@ -135,36 +137,39 @@ static int help(void) {
"Spawn a minimal namespace container for debugging, testing and building.\n\n"
" -h --help Show this help\n"
" --version Print version string\n"
+ " -q --quiet Do not show status information\n"
" -D --directory=NAME Root directory for the container\n"
" -b --boot Boot up full system (i.e. invoke init)\n"
" -u --user=USER Run the command under specified user or uid\n"
- " --uuid=UUID Set a specific machine UUID for the container\n"
" -M --machine=NAME Set the machine name for the container\n"
+ " --uuid=UUID Set a specific machine UUID for the container\n"
" -S --slice=SLICE Place the container in the specified slice\n"
+ " --private-network Disable network in container\n"
+ " --network-interface=INTERFACE\n"
+ " Assign an existing network interface to the\n"
+ " container\n"
+ " --network-veth Add a a virtual ethernet connection between host\n"
+ " and container\n"
" -Z --selinux-context=SECLABEL\n"
" Set the SELinux security context to be used by\n"
" processes in the container\n"
" -L --selinux-apifs-context=SECLABEL\n"
" Set the SELinux security context to be used by\n"
" API/tmpfs file systems in the container\n"
- " --private-network Disable network in container\n"
- " --network-interface=INTERFACE\n"
- " Assign an existing network interface to the container\n"
- " --share-system Share system namespaces with host\n"
- " --read-only Mount the root directory read-only\n"
" --capability=CAP In addition to the default, retain specified\n"
" capability\n"
" --drop-capability=CAP Drop the specified capability from the default set\n"
" --link-journal=MODE Link up guest journal, one of no, auto, guest, host\n"
" -j Equivalent to --link-journal=host\n"
+ " --read-only Mount the root directory read-only\n"
" --bind=PATH[:PATH] Bind mount a file or directory from the host into\n"
" the container\n"
" --bind-ro=PATH[:PATH] Similar, but creates a read-only bind mount\n"
" --setenv=NAME=VALUE Pass an environment variable to PID 1\n"
+ " --share-system Share system namespaces with host\n"
" --register=BOOLEAN Register container as machine\n"
" --keep-unit Do not register a scope for the machine, reuse\n"
- " the service unit nspawn is running in\n"
- " -q --quiet Do not show status information\n",
+ " the service unit nspawn is running in\n",
program_invocation_short_name);
return 0;
@@ -186,7 +191,8 @@ static int parse_argv(int argc, char *argv[]) {
ARG_SHARE_SYSTEM,
ARG_REGISTER,
ARG_KEEP_UNIT,
- ARG_NETWORK_INTERFACE
+ ARG_NETWORK_INTERFACE,
+ ARG_NETWORK_VETH,
};
static const struct option options[] = {
@@ -213,6 +219,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "register", required_argument, NULL, ARG_REGISTER },
{ "keep-unit", no_argument, NULL, ARG_KEEP_UNIT },
{ "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE },
+ { "network-veth", no_argument, NULL, ARG_NETWORK_VETH },
{}
};
@@ -252,6 +259,11 @@ static int parse_argv(int argc, char *argv[]) {
break;
+ case ARG_NETWORK_VETH:
+ arg_network_veth = true;
+ arg_private_network = true;
+ break;
+
case ARG_NETWORK_INTERFACE:
if (strv_push(&arg_network_interfaces, optarg) < 0)
return log_oom();
@@ -1255,9 +1267,104 @@ static int reset_audit_loginuid(void) {
return 0;
}
-static int move_network_interfaces(pid_t pid) {
+static int setup_veth(int netns_fd) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
+ char iface_name[IFNAMSIZ] = "ve-";
+ int r;
+
+ if (!arg_private_network)
+ return 0;
+
+ if (!arg_network_veth)
+ return 0;
+
+ strncpy(iface_name+3, arg_machine, sizeof(iface_name) - 3);
+
+ r = sd_rtnl_open(0, &rtnl);
+ if (r < 0) {
+ log_error("Failed to connect to netlink: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_message_new_link(RTM_NEWLINK, 0, &m);
+ if (r < 0) {
+ log_error("Failed to allocate netlink message: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_message_append_string(m, IFLA_IFNAME, "host0");
+ if (r < 0) {
+ log_error("Failed to append netlink kind: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_message_open_container(m, IFLA_LINKINFO, 0);
+ if (r < 0) {
+ log_error("Failed to open netlink container: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_message_append_string(m, IFLA_INFO_KIND, "veth");
+ if (r < 0) {
+ log_error("Failed to append netlink kind: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_message_open_container(m, IFLA_INFO_DATA, 0);
+ if (r < 0) {
+ log_error("Failed to open netlink container: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_message_open_container(m, VETH_INFO_PEER, sizeof(struct ifinfomsg));
+ if (r < 0) {
+ log_error("z Failed to open netlink container: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_message_append_string(m, IFLA_IFNAME, iface_name);
+ if (r < 0) {
+ log_error("Failed to append netlink kind: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_FD, netns_fd);
+ if (r < 0) {
+ log_error("Failed to add netlink namespace field: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_message_close_container(m);
+ if (r < 0) {
+ log_error("Failed to close netlink container: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_message_close_container(m);
+ if (r < 0) {
+ log_error("Failed to close netlink container: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_message_close_container(m);
+ if (r < 0) {
+ log_error("Failed to close netlink container: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_call(rtnl, m, 0, NULL);
+ if (r < 0) {
+ log_error("Failed to add new veth interfaces: %s", strerror(-r));
+ return r;
+ }
+
+ return 0;
+}
+
+static int move_network_interfaces(pid_t pid) {
_cleanup_udev_unref_ struct udev *udev = NULL;
+ _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
char **i;
int r;
@@ -1326,15 +1433,16 @@ static int move_network_interfaces(pid_t pid) {
}
int main(int argc, char *argv[]) {
- pid_t pid = 0;
+
+ _cleanup_close_ int master = -1, kdbus_fd = -1, sync_fd = -1, netns_fd = -1;
+ _cleanup_close_pipe_ int kmsg_socket_pair[2] = { -1, -1 };
+ _cleanup_free_ char *kdbus_domain = NULL;
+ _cleanup_fdset_free_ FDSet *fds = NULL;
+ const char *console = NULL;
int r = EXIT_FAILURE, k;
- _cleanup_close_ int master = -1, kdbus_fd = -1, sync_fd = -1;
int n_fd_passed;
- const char *console = NULL;
+ pid_t pid = 0;
sigset_t mask;
- _cleanup_close_pipe_ int kmsg_socket_pair[2] = { -1, -1 };
- _cleanup_fdset_free_ FDSet *fds = NULL;
- _cleanup_free_ char *kdbus_domain = NULL;
log_parse_environment();
log_open();
@@ -1429,6 +1537,13 @@ int main(int argc, char *argv[]) {
goto finish;
}
+ if (arg_network_veth) {
+ netns_fd = open("/proc/self/ns/net", O_RDWR|O_CLOEXEC);
+ if (netns_fd < 0) {
+ log_error("Failed to open network namespace fd: %m");
+ goto finish;
+ }
+ }
if (access("/dev/kdbus/control", F_OK) >= 0) {
@@ -1584,6 +1699,14 @@ int main(int argc, char *argv[]) {
dev_setup(arg_directory);
+ if (setup_veth(netns_fd) < 0)
+ goto child_fail;
+
+ if (netns_fd >= 0) {
+ close_nointr_nofail(netns_fd);
+ netns_fd = -1;
+ }
+
if (setup_dev_console(arg_directory, console) < 0)
goto child_fail;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-22 23:31:55 +0000