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nspawn: add new --network-bridge= switch

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This adds the host side of the veth link to the given bridge.

Also refactor the creation of the veth interfaces a bit to set it up
from the host rather than the container. This simplifies the addition
to the bridge, but otherwise the behavior is unchanged.
This commit is contained in:
Tom Gundersen 2014-02-16 21:12:47 +01:00
parent 1733a00f62
commit ab046dde6f
3 changed files with 98 additions and 28 deletions
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1
TODO
View File

@ -432,7 +432,6 @@ Features:
- refuses to boot containers without /etc/machine-id (OK?), and with empty /etc/machine-id (not OK).
- support taking a btrfs snapshot at startup and dropping it afterwards
- maybe: hookup nspawn and PrivateNetwork=yes with "ip netns"
- introduce --network-bridge= which works like --network-veth but also adds the host side to an existing bridge
- allow booting disk images with a GPT signature using the bootloaderspec partition uuids
* cryptsetup:

14
man/systemd-nspawn.xml
View File

@ -270,7 +270,7 @@
exception of the loopback device and
those specified with
<option>--network-interface=</option>
and configured ith
and configured with
<option>--network-veth</option>. If
this option is specified the
CAP_NET_ADMIN capability will be added
@ -318,6 +318,18 @@
<option>--private-network</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--network-bridge=</option></term>
<listitem><para>Adds the host side of the
ethernet link created with
<option>--network-veth</option>
to the specified bridge. Note that
<option>--network-bridge</option>
implies
<option>--network-veth</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-Z</option></term>
<term><option>--selinux-context=</option></term>

111
src/nspawn/nspawn.c
View File

@ -133,6 +133,7 @@ static bool arg_register = true;
static bool arg_keep_unit = false;
static char **arg_network_interfaces = NULL;
static bool arg_network_veth = false;
static char *arg_network_bridge = NULL;
static int help(void) {
@ -153,6 +154,10 @@ static int help(void) {
" container\n"
" --network-veth Add a a virtual ethernet connection between host\n"
" and container\n"
" --network-bridge=INTERFACE\n"
" Add a a virtual ethernet connection between host\n"
" and container and add it to an existing bridge on\n"
" the host\n"
" -Z --selinux-context=SECLABEL\n"
" Set the SELinux security context to be used by\n"
" processes in the container\n"
@ -196,6 +201,7 @@ static int parse_argv(int argc, char *argv[]) {
ARG_KEEP_UNIT,
ARG_NETWORK_INTERFACE,
ARG_NETWORK_VETH,
ARG_NETWORK_BRIDGE,
};
static const struct option options[] = {
@ -222,7 +228,8 @@ 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 },
{ "network-veth", no_argument, NULL, ARG_NETWORK_VETH },
{ "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
{}
};
@ -262,6 +269,13 @@ 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();
/* fall through */
case ARG_NETWORK_VETH:
arg_network_veth = true;
arg_private_network = true;
@ -1270,10 +1284,9 @@ static int reset_audit_loginuid(void) {
return 0;
}
static int setup_veth(int netns_fd) {
static int setup_veth(pid_t pid, char iface_name[]) {
_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)
@ -1282,7 +1295,7 @@ static int setup_veth(int netns_fd) {
if (!arg_network_veth)
return 0;
strncpy(iface_name+3, arg_machine, sizeof(iface_name) - 3);
strncpy(iface_name+3, arg_machine, IFNAMSIZ - 3);
r = sd_rtnl_open(0, &rtnl);
if (r < 0) {
@ -1296,9 +1309,9 @@ static int setup_veth(int netns_fd) {
return r;
}
r = sd_rtnl_message_append_string(m, IFLA_IFNAME, "host0");
r = sd_rtnl_message_append_string(m, IFLA_IFNAME, iface_name);
if (r < 0) {
log_error("Failed to append netlink kind: %s", strerror(-r));
log_error("Failed to add netlink interface name: %s", strerror(-r));
return r;
}
@ -1322,17 +1335,17 @@ static int setup_veth(int netns_fd) {
r = sd_rtnl_message_open_container(m, VETH_INFO_PEER);
if (r < 0) {
log_error("z Failed to open netlink container: %s", strerror(-r));
log_error("Failed to open netlink container: %s", strerror(-r));
return r;
}
r = sd_rtnl_message_append_string(m, IFLA_IFNAME, iface_name);
r = sd_rtnl_message_append_string(m, IFLA_IFNAME, "host0");
if (r < 0) {
log_error("Failed to append netlink kind: %s", strerror(-r));
log_error("Failed to add netlink interface name: %s", strerror(-r));
return r;
}
r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_FD, netns_fd);
r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
if (r < 0) {
log_error("Failed to add netlink namespace field: %s", strerror(-r));
return r;
@ -1365,6 +1378,59 @@ static int setup_veth(int netns_fd) {
return 0;
}
static int setup_bridge(const char veth_name[]) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
int r, bridge;
if (!arg_private_network)
return 0;
if (!arg_network_veth)
return 0;
if (!arg_network_bridge)
return 0;
bridge = (int) if_nametoindex(arg_network_bridge);
if (bridge <= 0) {
log_error("Failed to resolve interface %s: %m", arg_network_bridge);
return -errno;
}
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_SETLINK, 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, veth_name);
if (r < 0) {
log_error("Failed to add netlink interface name field: %s", strerror(-r));
return r;
}
r = sd_rtnl_message_append_u32(m, IFLA_MASTER, bridge);
if (r < 0) {
log_error("Failed to add netlink master field: %s", strerror(-r));
return r;
}
r = sd_rtnl_call(rtnl, m, 0, NULL);
if (r < 0) {
log_error("Failed to add veth interface to bridge: %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;
@ -1497,6 +1563,7 @@ int main(int argc, char *argv[]) {
int n_fd_passed;
pid_t pid = 0;
sigset_t mask;
char veth_name[IFNAMSIZ] = "ve-";
log_parse_environment();
log_open();
@ -1603,14 +1670,6 @@ 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) {
if (arg_share_system) {
@ -1765,14 +1824,6 @@ 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 (audit_still_doesnt_work_in_containers() < 0)
goto child_fail;
@ -1987,6 +2038,14 @@ int main(int argc, char *argv[]) {
if (r < 0)
goto finish;
r = setup_veth(pid, veth_name);
if (r < 0)
goto finish;
r = setup_bridge(veth_name);
if (r < 0)
goto finish;
eventfd_write(sync_fd, 1);
close_nointr_nofail(sync_fd);
sync_fd = -1;