nspawn: split out network related code to nspawn-network.[ch]
This commit is contained in:
Lennart Poettering
@@ -0,0 +1,441 @@
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2015 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <linux/veth.h>
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#include <net/if.h>
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#include "sd-id128.h"
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#include "sd-netlink.h"
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#include "libudev.h"
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#include "util.h"
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#include "ether-addr-util.h"
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#include "siphash24.h"
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#include "netlink-util.h"
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#include "udev-util.h"
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#include "nspawn.h"
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#include "nspawn-network.h"
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#define HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1)
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#define CONTAINER_HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2)
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#define MACVLAN_HASH_KEY SD_ID128_MAKE(00,13,6d,bc,66,83,44,81,bb,0c,f9,51,1f,24,a6,6f)
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static int generate_mac(
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const char *machine_name,
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struct ether_addr *mac,
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sd_id128_t hash_key,
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uint64_t idx) {
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uint8_t result[8];
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size_t l, sz;
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uint8_t *v, *i;
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int r;
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l = strlen(machine_name);
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sz = sizeof(sd_id128_t) + l;
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if (idx > 0)
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sz += sizeof(idx);
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v = alloca(sz);
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/* fetch some persistent data unique to the host */
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r = sd_id128_get_machine((sd_id128_t*) v);
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if (r < 0)
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return r;
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/* combine with some data unique (on this host) to this
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* container instance */
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i = mempcpy(v + sizeof(sd_id128_t), machine_name, l);
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if (idx > 0) {
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idx = htole64(idx);
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memcpy(i, &idx, sizeof(idx));
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}
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/* Let's hash the host machine ID plus the container name. We
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* use a fixed, but originally randomly created hash key here. */
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siphash24(result, v, sz, hash_key.bytes);
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assert_cc(ETH_ALEN <= sizeof(result));
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memcpy(mac->ether_addr_octet, result, ETH_ALEN);
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/* see eth_random_addr in the kernel */
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mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
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mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
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return 0;
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}
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int setup_veth(const char *machine_name,
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pid_t pid,
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char iface_name[IFNAMSIZ],
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bool bridge) {
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_cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
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_cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
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struct ether_addr mac_host, mac_container;
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int r, i;
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/* Use two different interface name prefixes depending whether
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* we are in bridge mode or not. */
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snprintf(iface_name, IFNAMSIZ - 1, "%s-%s",
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bridge ? "vb" : "ve", machine_name);
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r = generate_mac(machine_name, &mac_container, CONTAINER_HASH_KEY, 0);
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if (r < 0)
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return log_error_errno(r, "Failed to generate predictable MAC address for container side: %m");
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r = generate_mac(machine_name, &mac_host, HOST_HASH_KEY, 0);
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if (r < 0)
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return log_error_errno(r, "Failed to generate predictable MAC address for host side: %m");
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r = sd_netlink_open(&rtnl);
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if (r < 0)
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return log_error_errno(r, "Failed to connect to netlink: %m");
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r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
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if (r < 0)
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return log_error_errno(r, "Failed to allocate netlink message: %m");
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r = sd_netlink_message_append_string(m, IFLA_IFNAME, iface_name);
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if (r < 0)
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return log_error_errno(r, "Failed to add netlink interface name: %m");
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r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac_host);
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if (r < 0)
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return log_error_errno(r, "Failed to add netlink MAC address: %m");
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r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
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if (r < 0)
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return log_error_errno(r, "Failed to open netlink container: %m");
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r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "veth");
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if (r < 0)
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return log_error_errno(r, "Failed to open netlink container: %m");
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r = sd_netlink_message_open_container(m, VETH_INFO_PEER);
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if (r < 0)
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return log_error_errno(r, "Failed to open netlink container: %m");
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r = sd_netlink_message_append_string(m, IFLA_IFNAME, "host0");
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if (r < 0)
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return log_error_errno(r, "Failed to add netlink interface name: %m");
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r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac_container);
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if (r < 0)
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return log_error_errno(r, "Failed to add netlink MAC address: %m");
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r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
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if (r < 0)
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return log_error_errno(r, "Failed to add netlink namespace field: %m");
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r = sd_netlink_message_close_container(m);
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if (r < 0)
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return log_error_errno(r, "Failed to close netlink container: %m");
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r = sd_netlink_message_close_container(m);
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if (r < 0)
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return log_error_errno(r, "Failed to close netlink container: %m");
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r = sd_netlink_message_close_container(m);
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if (r < 0)
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return log_error_errno(r, "Failed to close netlink container: %m");
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r = sd_netlink_call(rtnl, m, 0, NULL);
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if (r < 0)
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return log_error_errno(r, "Failed to add new veth interfaces (host0, %s): %m", iface_name);
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i = (int) if_nametoindex(iface_name);
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if (i <= 0)
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return log_error_errno(errno, "Failed to resolve interface %s: %m", iface_name);
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return i;
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}
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int setup_bridge(const char *veth_name, const char *bridge_name) {
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_cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
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_cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
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int r, bridge_ifi;
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assert(veth_name);
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assert(bridge_name);
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bridge_ifi = (int) if_nametoindex(bridge_name);
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if (bridge_ifi <= 0)
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return log_error_errno(errno, "Failed to resolve interface %s: %m", bridge_name);
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r = sd_netlink_open(&rtnl);
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if (r < 0)
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return log_error_errno(r, "Failed to connect to netlink: %m");
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r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0);
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if (r < 0)
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return log_error_errno(r, "Failed to allocate netlink message: %m");
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r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP);
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if (r < 0)
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return log_error_errno(r, "Failed to set IFF_UP flag: %m");
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r = sd_netlink_message_append_string(m, IFLA_IFNAME, veth_name);
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if (r < 0)
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return log_error_errno(r, "Failed to add netlink interface name field: %m");
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r = sd_netlink_message_append_u32(m, IFLA_MASTER, bridge_ifi);
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if (r < 0)
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return log_error_errno(r, "Failed to add netlink master field: %m");
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r = sd_netlink_call(rtnl, m, 0, NULL);
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if (r < 0)
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return log_error_errno(r, "Failed to add veth interface to bridge: %m");
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return bridge_ifi;
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}
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static int parse_interface(struct udev *udev, const char *name) {
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_cleanup_udev_device_unref_ struct udev_device *d = NULL;
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char ifi_str[2 + DECIMAL_STR_MAX(int)];
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int ifi;
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ifi = (int) if_nametoindex(name);
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if (ifi <= 0)
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return log_error_errno(errno, "Failed to resolve interface %s: %m", name);
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sprintf(ifi_str, "n%i", ifi);
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d = udev_device_new_from_device_id(udev, ifi_str);
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if (!d)
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return log_error_errno(errno, "Failed to get udev device for interface %s: %m", name);
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if (udev_device_get_is_initialized(d) <= 0) {
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log_error("Network interface %s is not initialized yet.", name);
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return -EBUSY;
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}
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return ifi;
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}
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int move_network_interfaces(pid_t pid, char **ifaces) {
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_cleanup_udev_unref_ struct udev *udev = NULL;
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_cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
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char **i;
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int r;
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if (strv_isempty(ifaces))
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return 0;
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r = sd_netlink_open(&rtnl);
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if (r < 0)
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return log_error_errno(r, "Failed to connect to netlink: %m");
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udev = udev_new();
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if (!udev) {
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log_error("Failed to connect to udev.");
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return -ENOMEM;
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}
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STRV_FOREACH(i, ifaces) {
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_cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
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int ifi;
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ifi = parse_interface(udev, *i);
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if (ifi < 0)
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return ifi;
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r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, ifi);
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if (r < 0)
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return log_error_errno(r, "Failed to allocate netlink message: %m");
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r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
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if (r < 0)
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return log_error_errno(r, "Failed to append namespace PID to netlink message: %m");
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r = sd_netlink_call(rtnl, m, 0, NULL);
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if (r < 0)
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return log_error_errno(r, "Failed to move interface %s to namespace: %m", *i);
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}
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return 0;
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}
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int setup_macvlan(const char *machine_name, pid_t pid, char **ifaces) {
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_cleanup_udev_unref_ struct udev *udev = NULL;
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_cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
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unsigned idx = 0;
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char **i;
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int r;
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if (strv_isempty(ifaces))
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return 0;
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r = sd_netlink_open(&rtnl);
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if (r < 0)
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return log_error_errno(r, "Failed to connect to netlink: %m");
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udev = udev_new();
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if (!udev) {
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log_error("Failed to connect to udev.");
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return -ENOMEM;
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}
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STRV_FOREACH(i, ifaces) {
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_cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
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_cleanup_free_ char *n = NULL;
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struct ether_addr mac;
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int ifi;
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ifi = parse_interface(udev, *i);
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if (ifi < 0)
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return ifi;
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r = generate_mac(machine_name, &mac, MACVLAN_HASH_KEY, idx++);
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if (r < 0)
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return log_error_errno(r, "Failed to create MACVLAN MAC address: %m");
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r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
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if (r < 0)
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return log_error_errno(r, "Failed to allocate netlink message: %m");
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r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi);
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if (r < 0)
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return log_error_errno(r, "Failed to add netlink interface index: %m");
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n = strappend("mv-", *i);
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if (!n)
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return log_oom();
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strshorten(n, IFNAMSIZ-1);
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r = sd_netlink_message_append_string(m, IFLA_IFNAME, n);
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if (r < 0)
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return log_error_errno(r, "Failed to add netlink interface name: %m");
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r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac);
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if (r < 0)
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return log_error_errno(r, "Failed to add netlink MAC address: %m");
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r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
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if (r < 0)
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return log_error_errno(r, "Failed to add netlink namespace field: %m");
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r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
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if (r < 0)
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return log_error_errno(r, "Failed to open netlink container: %m");
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r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "macvlan");
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if (r < 0)
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return log_error_errno(r, "Failed to open netlink container: %m");
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r = sd_netlink_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE);
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if (r < 0)
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return log_error_errno(r, "Failed to append macvlan mode: %m");
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r = sd_netlink_message_close_container(m);
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if (r < 0)
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return log_error_errno(r, "Failed to close netlink container: %m");
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r = sd_netlink_message_close_container(m);
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if (r < 0)
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return log_error_errno(r, "Failed to close netlink container: %m");
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r = sd_netlink_call(rtnl, m, 0, NULL);
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if (r < 0)
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return log_error_errno(r, "Failed to add new macvlan interfaces: %m");
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}
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return 0;
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}
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int setup_ipvlan(const char *machine_name, pid_t pid, char **ifaces) {
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_cleanup_udev_unref_ struct udev *udev = NULL;
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_cleanup_netlink_unref_ sd_netlink *rtnl = NULL;
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char **i;
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int r;
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if (strv_isempty(ifaces))
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return 0;
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r = sd_netlink_open(&rtnl);
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if (r < 0)
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return log_error_errno(r, "Failed to connect to netlink: %m");
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udev = udev_new();
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if (!udev) {
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log_error("Failed to connect to udev.");
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return -ENOMEM;
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}
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STRV_FOREACH(i, ifaces) {
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_cleanup_netlink_message_unref_ sd_netlink_message *m = NULL;
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_cleanup_free_ char *n = NULL;
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int ifi;
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ifi = parse_interface(udev, *i);
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if (ifi < 0)
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return ifi;
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r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
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if (r < 0)
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return log_error_errno(r, "Failed to allocate netlink message: %m");
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r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi);
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if (r < 0)
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return log_error_errno(r, "Failed to add netlink interface index: %m");
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n = strappend("iv-", *i);
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if (!n)
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return log_oom();
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strshorten(n, IFNAMSIZ-1);
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r = sd_netlink_message_append_string(m, IFLA_IFNAME, n);
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if (r < 0)
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return log_error_errno(r, "Failed to add netlink interface name: %m");
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r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
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if (r < 0)
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return log_error_errno(r, "Failed to add netlink namespace field: %m");
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r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
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if (r < 0)
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return log_error_errno(r, "Failed to open netlink container: %m");
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r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "ipvlan");
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if (r < 0)
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return log_error_errno(r, "Failed to open netlink container: %m");
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r = sd_netlink_message_append_u16(m, IFLA_IPVLAN_MODE, IPVLAN_MODE_L2);
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if (r < 0)
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return log_error_errno(r, "Failed to add ipvlan mode: %m");
|
||||
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r = sd_netlink_message_close_container(m);
|
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if (r < 0)
|
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return log_error_errno(r, "Failed to close netlink container: %m");
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||||
|
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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;
|
||||
}
|
||||
Reference in New Issue
Block a user