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-rw-r--r--man/systemd-nspawn.xml30
-rw-r--r--src/libsystemd/sd-rtnl/rtnl-message.c1
-rw-r--r--src/nspawn/nspawn.c197
3 files changed, 194 insertions, 34 deletions
diff --git a/man/systemd-nspawn.xml b/man/systemd-nspawn.xml
index 0a661c925..a4f222c34 100644
--- a/man/systemd-nspawn.xml
+++ b/man/systemd-nspawn.xml
@@ -260,7 +260,7 @@
<listitem><para>Assign the specified
network interface to the
- container. This will move the
+ container. This will remove the
specified interface from the calling
namespace and place it in the
container. When the container
@@ -275,11 +275,35 @@
</varlistentry>
<varlistentry>
+ <term><option>--network-macvlan=</option></term>
+
+ <listitem><para>Create a
+ <literal>macvlan</literal> interface
+ of the specified Ethernet network
+ interface and add it to the
+ container. A
+ <literal>macvlan</literal> interface
+ is a virtual interface that adds a
+ second MAC address to an existing
+ physical Ethernet link. The interface
+ in the container will be named after
+ the interface on the host, prefixed
+ with <literal>mv-</literal>. Note that
+ <option>--network-macvlan=</option>
+ implies
+ <option>--private-network</option>. This
+ option may be used more than once to
+ add multiple network interfaces to the
+ container.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
<term><option>--network-veth</option></term>
<listitem><para>Create a virtual
- Ethernet link between host and
- container. The host side of the
+ Ethernet link
+ (<literal>veth</literal>) between host
+ and container. The host side of the
Ethernet link will be available as a
network interface named after the
container's name (as specified with
diff --git a/src/libsystemd/sd-rtnl/rtnl-message.c b/src/libsystemd/sd-rtnl/rtnl-message.c
index dc7494799..27b606593 100644
--- a/src/libsystemd/sd-rtnl/rtnl-message.c
+++ b/src/libsystemd/sd-rtnl/rtnl-message.c
@@ -521,6 +521,7 @@ int sd_rtnl_message_append_u32(sd_rtnl_message *m, unsigned short type, uint32_t
case IFLA_PROMISCUITY:
case IFLA_NUM_TX_QUEUES:
case IFLA_NUM_RX_QUEUES:
+ case IFLA_MACVLAN_MODE:
break;
default:
return -ENOTSUP;
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index de74a4317..1a0293524 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -95,8 +95,8 @@ static char *arg_directory = NULL;
static char *arg_user = NULL;
static sd_id128_t arg_uuid = {};
static char *arg_machine = NULL;
-static char *arg_selinux_context = NULL;
-static char *arg_selinux_apifs_context = NULL;
+static const char *arg_selinux_context = NULL;
+static const char *arg_selinux_apifs_context = NULL;
static const char *arg_slice = NULL;
static bool arg_private_network = false;
static bool arg_read_only = false;
@@ -137,8 +137,9 @@ static bool arg_share_system = false;
static bool arg_register = true;
static bool arg_keep_unit = false;
static char **arg_network_interfaces = NULL;
+static char **arg_network_macvlan = NULL;
static bool arg_network_veth = false;
-static char *arg_network_bridge = NULL;
+static const char *arg_network_bridge = NULL;
static unsigned long arg_personality = 0xffffffffLU;
static int help(void) {
@@ -158,6 +159,9 @@ static int help(void) {
" --network-interface=INTERFACE\n"
" Assign an existing network interface to the\n"
" container\n"
+ " --network-macvlan=INTERFACE\n"
+ " Create a macvlan network interface based on an\n"
+ " existing network interface to the container\n"
" --network-veth Add a virtual ethernet connection between host\n"
" and container\n"
" --network-bridge=INTERFACE\n"
@@ -206,6 +210,7 @@ static int parse_argv(int argc, char *argv[]) {
ARG_REGISTER,
ARG_KEEP_UNIT,
ARG_NETWORK_INTERFACE,
+ ARG_NETWORK_MACVLAN,
ARG_NETWORK_VETH,
ARG_NETWORK_BRIDGE,
ARG_PERSONALITY,
@@ -235,6 +240,7 @@ 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-macvlan", required_argument, NULL, ARG_NETWORK_MACVLAN },
{ "network-veth", no_argument, NULL, ARG_NETWORK_VETH },
{ "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
{ "personality", required_argument, NULL, ARG_PERSONALITY },
@@ -278,9 +284,7 @@ static int parse_argv(int argc, char *argv[]) {
break;
case ARG_NETWORK_BRIDGE:
- arg_network_bridge = strdup(optarg);
- if (!arg_network_bridge)
- return log_oom();
+ arg_network_bridge = optarg;
/* fall through */
@@ -290,7 +294,14 @@ static int parse_argv(int argc, char *argv[]) {
break;
case ARG_NETWORK_INTERFACE:
- if (strv_push(&arg_network_interfaces, optarg) < 0)
+ if (strv_extend(&arg_network_interfaces, optarg) < 0)
+ return log_oom();
+
+ arg_private_network = true;
+ break;
+
+ case ARG_NETWORK_MACVLAN:
+ if (strv_extend(&arg_network_macvlan, optarg) < 0)
return log_oom();
/* fall through */
@@ -312,10 +323,7 @@ static int parse_argv(int argc, char *argv[]) {
break;
case 'S':
- arg_slice = strdup(optarg);
- if (!arg_slice)
- return log_oom();
-
+ arg_slice = optarg;
break;
case 'M':
@@ -1520,6 +1528,32 @@ static int setup_bridge(const char veth_name[]) {
return 0;
}
+static int parse_interface(struct udev *udev, const char *name) {
+ _cleanup_udev_device_unref_ struct udev_device *d = NULL;
+ char ifi_str[2 + DECIMAL_STR_MAX(int)];
+ int ifi;
+
+ ifi = (int) if_nametoindex(name);
+ if (ifi <= 0) {
+ log_error("Failed to resolve interface %s: %m", name);
+ return -errno;
+ }
+
+ sprintf(ifi_str, "n%i", ifi);
+ d = udev_device_new_from_device_id(udev, ifi_str);
+ if (!d) {
+ log_error("Failed to get udev device for interface %s: %m", name);
+ return -errno;
+ }
+
+ if (udev_device_get_is_initialized(d) <= 0) {
+ log_error("Network interface %s is not initialized yet.", name);
+ return -EBUSY;
+ }
+
+ return ifi;
+}
+
static int move_network_interfaces(pid_t pid) {
_cleanup_udev_unref_ struct udev *udev = NULL;
_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
@@ -1546,43 +1580,136 @@ static int move_network_interfaces(pid_t pid) {
STRV_FOREACH(i, arg_network_interfaces) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
- _cleanup_udev_device_unref_ struct udev_device *d = NULL;
- char ifi_str[2 + DECIMAL_STR_MAX(int)];
int ifi;
- ifi = (int) if_nametoindex(*i);
- if (ifi <= 0) {
- log_error("Failed to resolve interface %s: %m", *i);
- return -errno;
+ ifi = parse_interface(udev, *i);
+ if (ifi < 0)
+ return ifi;
+
+ r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, ifi);
+ if (r < 0) {
+ log_error("Failed to allocate netlink message: %s", strerror(-r));
+ return r;
}
- sprintf(ifi_str, "n%i", ifi);
- d = udev_device_new_from_device_id(udev, ifi_str);
- if (!d) {
- log_error("Failed to get udev device for interface %s: %m", *i);
- return -errno;
+ r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
+ if (r < 0) {
+ log_error("Failed to append namespace PID to netlink message: %s", strerror(-r));
+ return r;
}
- if (udev_device_get_is_initialized(d) <= 0) {
- log_error("Network interface %s is not initialized yet.", *i);
- return -EBUSY;
+ r = sd_rtnl_call(rtnl, m, 0, NULL);
+ if (r < 0) {
+ log_error("Failed to move interface %s to namespace: %s", *i, strerror(-r));
+ return r;
}
+ }
- r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, ifi);
+ return 0;
+}
+
+static int setup_macvlan(pid_t pid) {
+ _cleanup_udev_unref_ struct udev *udev = NULL;
+ _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
+ char **i;
+ int r;
+
+ if (!arg_private_network)
+ return 0;
+
+ if (strv_isempty(arg_network_macvlan))
+ return 0;
+
+ r = sd_rtnl_open(&rtnl, 0);
+ if (r < 0) {
+ log_error("Failed to connect to netlink: %s", strerror(-r));
+ return r;
+ }
+
+ udev = udev_new();
+ if (!udev) {
+ log_error("Failed to connect to udev.");
+ return -ENOMEM;
+ }
+
+ STRV_FOREACH(i, arg_network_macvlan) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
+ _cleanup_free_ char *n = NULL;
+ int ifi;
+
+ ifi = parse_interface(udev, *i);
+ if (ifi < 0)
+ return ifi;
+
+ r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
if (r < 0) {
log_error("Failed to allocate netlink message: %s", strerror(-r));
return r;
}
+ r = sd_rtnl_message_append_u32(m, IFLA_LINK, ifi);
+ if (r < 0) {
+ log_error("Failed to add netlink interface index: %s", strerror(-r));
+ return r;
+ }
+
+ n = strappend("mv-", *i);
+ if (!n)
+ return log_oom();
+
+ strshorten(n, IFNAMSIZ-1);
+
+ r = sd_rtnl_message_append_string(m, IFLA_IFNAME, n);
+ if (r < 0) {
+ log_error("Failed to add netlink interface name: %s", strerror(-r));
+ return r;
+ }
+
r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
if (r < 0) {
- log_error("Failed to append namespace PID to netlink message: %s", strerror(-r));
+ log_error("Failed to add netlink namespace field: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);
+ 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, "macvlan");
+ 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);
+ if (r < 0) {
+ log_error("Failed to open netlink container: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE);
+ if (r < 0) {
+ log_error("Failed to append macvlan mode: %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 move interface %s to namespace: %s", *i, strerror(-r));
+ log_error("Failed to add new macvlan interfaces: %s", strerror(-r));
return r;
}
}
@@ -2094,7 +2221,7 @@ int main(int argc, char *argv[]) {
#ifdef HAVE_SELINUX
if (arg_selinux_context)
- if (setexeccon(arg_selinux_context) < 0)
+ if (setexeccon((security_context_t) arg_selinux_context) < 0)
log_error("setexeccon(\"%s\") failed: %m", arg_selinux_context);
#endif
if (arg_boot) {
@@ -2148,6 +2275,10 @@ int main(int argc, char *argv[]) {
if (r < 0)
goto finish;
+ r = setup_macvlan(pid);
+ if (r < 0)
+ goto finish;
+
eventfd_write(sync_fd, 1);
close_nointr_nofail(sync_fd);
sync_fd = -1;
@@ -2217,8 +2348,12 @@ finish:
free(arg_directory);
free(arg_machine);
- free(arg_setenv);
- free(arg_network_interfaces);
+ free(arg_user);
+ strv_free(arg_setenv);
+ strv_free(arg_network_interfaces);
+ strv_free(arg_network_macvlan);
+ strv_free(arg_bind);
+ strv_free(arg_bind_ro);
return r;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-08 23:16:20 +0000