summaryrefslogtreecommitdiff
path: root/src/nspawn/nspawn.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/nspawn/nspawn.c')
-rw-r--r--src/nspawn/nspawn.c466
1 files changed, 27 insertions, 439 deletions
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index 92c14143c1..7550ca057b 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -34,8 +34,6 @@
#include <linux/fs.h>
#include <sys/socket.h>
#include <linux/netlink.h>
-#include <net/if.h>
-#include <linux/veth.h>
#include <sys/personality.h>
#include <linux/loop.h>
#include <sys/file.h>
@@ -78,7 +76,6 @@
#include "udev-util.h"
#include "blkid-util.h"
#include "gpt.h"
-#include "siphash24.h"
#include "copy.h"
#include "base-filesystem.h"
#include "barrier.h"
@@ -102,6 +99,7 @@
#include "nspawn.h"
#include "nspawn-settings.h"
#include "nspawn-mount.h"
+#include "nspawn-network.h"
#include "nspawn-expose-ports.h"
typedef enum ContainerStatus {
@@ -1762,427 +1760,6 @@ static int reset_audit_loginuid(void) {
return 0;
}
-#define HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1)
-#define CONTAINER_HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2)
-#define MACVLAN_HASH_KEY SD_ID128_MAKE(00,13,6d,bc,66,83,44,81,bb,0c,f9,51,1f,24,a6,6f)
-
-static int generate_mac(struct ether_addr *mac, sd_id128_t hash_key, uint64_t idx) {
- uint8_t result[8];
- size_t l, sz;
- uint8_t *v, *i;
- int r;
-
- l = strlen(arg_machine);
- sz = sizeof(sd_id128_t) + l;
- if (idx > 0)
- sz += sizeof(idx);
-
- v = alloca(sz);
-
- /* fetch some persistent data unique to the host */
- r = sd_id128_get_machine((sd_id128_t*) v);
- if (r < 0)
- return r;
-
- /* combine with some data unique (on this host) to this
- * container instance */
- i = mempcpy(v + sizeof(sd_id128_t), arg_machine, l);
- if (idx > 0) {
- idx = htole64(idx);
- memcpy(i, &idx, sizeof(idx));
- }
-
- /* Let's hash the host machine ID plus the container name. We
- * use a fixed, but originally randomly created hash key here. */
- siphash24(result, v, sz, hash_key.bytes);
-
- assert_cc(ETH_ALEN <= sizeof(result));
- memcpy(mac->ether_addr_octet, result, ETH_ALEN);
-
- /* see eth_random_addr in the kernel */
- mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
- mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
-
- return 0;
-}
-
-static int setup_veth(pid_t pid, char iface_name[IFNAMSIZ], int *ifi) {
- _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
- _cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
- struct ether_addr mac_host, mac_container;
- int r, i;
-
- if (!arg_private_network)
- return 0;
-
- if (!arg_network_veth)
- return 0;
-
- /* Use two different interface name prefixes depending whether
- * we are in bridge mode or not. */
- snprintf(iface_name, IFNAMSIZ - 1, "%s-%s",
- arg_network_bridge ? "vb" : "ve", arg_machine);
-
- r = generate_mac(&mac_container, CONTAINER_HASH_KEY, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to generate predictable MAC address for container side: %m");
-
- r = generate_mac(&mac_host, HOST_HASH_KEY, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to generate predictable MAC address for host side: %m");
-
- r = sd_netlink_open(&rtnl);
- if (r < 0)
- return log_error_errno(r, "Failed to connect to netlink: %m");
-
- r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to allocate netlink message: %m");
-
- r = sd_netlink_message_append_string(m, IFLA_IFNAME, iface_name);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink interface name: %m");
-
- r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac_host);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink MAC address: %m");
-
- r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
- if (r < 0)
- return log_error_errno(r, "Failed to open netlink container: %m");
-
- r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "veth");
- if (r < 0)
- return log_error_errno(r, "Failed to open netlink container: %m");
-
- r = sd_netlink_message_open_container(m, VETH_INFO_PEER);
- if (r < 0)
- return log_error_errno(r, "Failed to open netlink container: %m");
-
- r = sd_netlink_message_append_string(m, IFLA_IFNAME, "host0");
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink interface name: %m");
-
- r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac_container);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink MAC address: %m");
-
- r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink namespace field: %m");
-
- r = sd_netlink_message_close_container(m);
- if (r < 0)
- return log_error_errno(r, "Failed to close netlink container: %m");
-
- r = sd_netlink_message_close_container(m);
- if (r < 0)
- return log_error_errno(r, "Failed to close netlink container: %m");
-
- r = sd_netlink_message_close_container(m);
- if (r < 0)
- return log_error_errno(r, "Failed to close netlink container: %m");
-
- r = sd_netlink_call(rtnl, m, 0, NULL);
- if (r < 0)
- return log_error_errno(r, "Failed to add new veth interfaces (host0, %s): %m", iface_name);
-
- i = (int) if_nametoindex(iface_name);
- if (i <= 0)
- return log_error_errno(errno, "Failed to resolve interface %s: %m", iface_name);
-
- *ifi = i;
-
- return 0;
-}
-
-static int setup_bridge(const char veth_name[], int *ifi) {
- _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
- _cleanup_netlink_unref_ sd_netlink *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)
- return log_error_errno(errno, "Failed to resolve interface %s: %m", arg_network_bridge);
-
- *ifi = bridge;
-
- r = sd_netlink_open(&rtnl);
- if (r < 0)
- return log_error_errno(r, "Failed to connect to netlink: %m");
-
- r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to allocate netlink message: %m");
-
- r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP);
- if (r < 0)
- return log_error_errno(r, "Failed to set IFF_UP flag: %m");
-
- r = sd_netlink_message_append_string(m, IFLA_IFNAME, veth_name);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink interface name field: %m");
-
- r = sd_netlink_message_append_u32(m, IFLA_MASTER, bridge);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink master field: %m");
-
- r = sd_netlink_call(rtnl, m, 0, NULL);
- if (r < 0)
- return log_error_errno(r, "Failed to add veth interface to bridge: %m");
-
- 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)
- return log_error_errno(errno, "Failed to resolve interface %s: %m", name);
-
- sprintf(ifi_str, "n%i", ifi);
- d = udev_device_new_from_device_id(udev, ifi_str);
- if (!d)
- return log_error_errno(errno, "Failed to get udev device for interface %s: %m", name);
-
- 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_netlink_unref_ sd_netlink *rtnl = NULL;
- char **i;
- int r;
-
- if (!arg_private_network)
- return 0;
-
- if (strv_isempty(arg_network_interfaces))
- return 0;
-
- r = sd_netlink_open(&rtnl);
- if (r < 0)
- return log_error_errno(r, "Failed to connect to netlink: %m");
-
- udev = udev_new();
- if (!udev) {
- log_error("Failed to connect to udev.");
- return -ENOMEM;
- }
-
- STRV_FOREACH(i, arg_network_interfaces) {
- _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
- int ifi;
-
- ifi = parse_interface(udev, *i);
- if (ifi < 0)
- return ifi;
-
- r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, ifi);
- if (r < 0)
- return log_error_errno(r, "Failed to allocate netlink message: %m");
-
- r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
- if (r < 0)
- return log_error_errno(r, "Failed to append namespace PID to netlink message: %m");
-
- r = sd_netlink_call(rtnl, m, 0, NULL);
- if (r < 0)
- return log_error_errno(r, "Failed to move interface %s to namespace: %m", *i);
- }
-
- return 0;
-}
-
-static int setup_macvlan(pid_t pid) {
- _cleanup_udev_unref_ struct udev *udev = NULL;
- _cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
- unsigned idx = 0;
- char **i;
- int r;
-
- if (!arg_private_network)
- return 0;
-
- if (strv_isempty(arg_network_macvlan))
- return 0;
-
- r = sd_netlink_open(&rtnl);
- if (r < 0)
- return log_error_errno(r, "Failed to connect to netlink: %m");
-
- udev = udev_new();
- if (!udev) {
- log_error("Failed to connect to udev.");
- return -ENOMEM;
- }
-
- STRV_FOREACH(i, arg_network_macvlan) {
- _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
- _cleanup_free_ char *n = NULL;
- struct ether_addr mac;
- int ifi;
-
- ifi = parse_interface(udev, *i);
- if (ifi < 0)
- return ifi;
-
- r = generate_mac(&mac, MACVLAN_HASH_KEY, idx++);
- if (r < 0)
- return log_error_errno(r, "Failed to create MACVLAN MAC address: %m");
-
- r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
- if (r < 0)
- return log_error_errno(r, "Failed to allocate netlink message: %m");
-
- r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink interface index: %m");
-
- n = strappend("mv-", *i);
- if (!n)
- return log_oom();
-
- strshorten(n, IFNAMSIZ-1);
-
- r = sd_netlink_message_append_string(m, IFLA_IFNAME, n);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink interface name: %m");
-
- r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink MAC address: %m");
-
- r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink namespace field: %m");
-
- r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
- if (r < 0)
- return log_error_errno(r, "Failed to open netlink container: %m");
-
- r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "macvlan");
- if (r < 0)
- return log_error_errno(r, "Failed to open netlink container: %m");
-
- r = sd_netlink_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE);
- if (r < 0)
- return log_error_errno(r, "Failed to append macvlan mode: %m");
-
- r = sd_netlink_message_close_container(m);
- if (r < 0)
- return log_error_errno(r, "Failed to close netlink container: %m");
-
- r = sd_netlink_message_close_container(m);
- if (r < 0)
- return log_error_errno(r, "Failed to close netlink container: %m");
-
- r = sd_netlink_call(rtnl, m, 0, NULL);
- if (r < 0)
- return log_error_errno(r, "Failed to add new macvlan interfaces: %m");
- }
-
- return 0;
-}
-
-static int setup_ipvlan(pid_t pid) {
- _cleanup_udev_unref_ struct udev *udev = NULL;
- _cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
- char **i;
- int r;
-
- if (!arg_private_network)
- return 0;
-
- if (strv_isempty(arg_network_ipvlan))
- return 0;
-
- r = sd_netlink_open(&rtnl);
- if (r < 0)
- return log_error_errno(r, "Failed to connect to netlink: %m");
-
- udev = udev_new();
- if (!udev) {
- log_error("Failed to connect to udev.");
- return -ENOMEM;
- }
-
- STRV_FOREACH(i, arg_network_ipvlan) {
- _cleanup_netlink_message_unref_ sd_netlink_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)
- return log_error_errno(r, "Failed to allocate netlink message: %m");
-
- r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink interface index: %m");
-
- n = strappend("iv-", *i);
- if (!n)
- return log_oom();
-
- strshorten(n, IFNAMSIZ-1);
-
- r = sd_netlink_message_append_string(m, IFLA_IFNAME, n);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink interface name: %m");
-
- r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
- if (r < 0)
- return log_error_errno(r, "Failed to add netlink namespace field: %m");
-
- r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
- if (r < 0)
- return log_error_errno(r, "Failed to open netlink container: %m");
-
- r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "ipvlan");
- if (r < 0)
- return log_error_errno(r, "Failed to open netlink container: %m");
-
- r = sd_netlink_message_append_u16(m, IFLA_IPVLAN_MODE, IPVLAN_MODE_L2);
- if (r < 0)
- return log_error_errno(r, "Failed to add ipvlan mode: %m");
-
- r = sd_netlink_message_close_container(m);
- if (r < 0)
- return log_error_errno(r, "Failed to close netlink container: %m");
-
- r = sd_netlink_message_close_container(m);
- if (r < 0)
- return log_error_errno(r, "Failed to close netlink container: %m");
-
- r = sd_netlink_call(rtnl, m, 0, NULL);
- if (r < 0)
- return log_error_errno(r, "Failed to add new ipvlan interfaces: %m");
- }
-
- return 0;
-}
-
static int setup_seccomp(void) {
#ifdef HAVE_SECCOMP
@@ -4430,25 +4007,36 @@ int main(int argc, char *argv[]) {
(void) barrier_place(&barrier); /* #2 */
}
- r = move_network_interfaces(pid);
- if (r < 0)
- goto finish;
+ if (arg_private_network) {
- r = setup_veth(pid, veth_name, &ifi);
- if (r < 0)
- goto finish;
+ r = move_network_interfaces(pid, arg_network_interfaces);
+ if (r < 0)
+ goto finish;
- r = setup_bridge(veth_name, &ifi);
- if (r < 0)
- goto finish;
+ if (arg_network_veth) {
+ r = setup_veth(arg_machine, pid, veth_name, !!arg_network_bridge);
+ if (r < 0)
+ goto finish;
+ else if (r > 0)
+ ifi = r;
- r = setup_macvlan(pid);
- if (r < 0)
- goto finish;
+ if (arg_network_bridge) {
+ r = setup_bridge(veth_name, arg_network_bridge);
+ if (r < 0)
+ goto finish;
+ if (r > 0)
+ ifi = r;
+ }
+ }
- r = setup_ipvlan(pid);
- if (r < 0)
- goto finish;
+ r = setup_macvlan(arg_machine, pid, arg_network_macvlan);
+ if (r < 0)
+ goto finish;
+
+ r = setup_ipvlan(arg_machine, pid, arg_network_ipvlan);
+ if (r < 0)
+ goto finish;
+ }
r = register_machine(pid, ifi);
if (r < 0)
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-09-01 02:22:00 +0000