diff options
Diffstat (limited to 'src/nspawn/nspawn-network.c')
| -rw-r--r-- | src/nspawn/nspawn-network.c | 694 |
1 files changed, 0 insertions, 694 deletions
diff --git a/src/nspawn/nspawn-network.c b/src/nspawn/nspawn-network.c deleted file mode 100644 index 428cc04de0..0000000000 --- a/src/nspawn/nspawn-network.c +++ /dev/null @@ -1,694 +0,0 @@ -/*** - This file is part of systemd. - - Copyright 2015 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#include <linux/veth.h> -#include <net/if.h> - -#include "libudev.h" -#include "sd-id128.h" -#include "sd-netlink.h" - -#include "alloc-util.h" -#include "ether-addr-util.h" -#include "lockfile-util.h" -#include "netlink-util.h" -#include "nspawn-network.h" -#include "siphash24.h" -#include "socket-util.h" -#include "stat-util.h" -#include "string-util.h" -#include "udev-util.h" -#include "util.h" - -#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 VETH_EXTRA_HOST_HASH_KEY SD_ID128_MAKE(48,c7,f6,b7,ea,9d,4c,9e,b7,28,d4,de,91,d5,bf,66) -#define VETH_EXTRA_CONTAINER_HASH_KEY SD_ID128_MAKE(af,50,17,61,ce,f9,4d,35,84,0d,2b,20,54,be,ce,59) -#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 remove_one_link(sd_netlink *rtnl, const char *name) { - _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; - int r; - - if (isempty(name)) - return 0; - - r = sd_rtnl_message_new_link(rtnl, &m, RTM_DELLINK, 0); - if (r < 0) - return log_error_errno(r, "Failed to allocate netlink message: %m"); - - r = sd_netlink_message_append_string(m, IFLA_IFNAME, name); - if (r < 0) - return log_error_errno(r, "Failed to add netlink interface name: %m"); - - r = sd_netlink_call(rtnl, m, 0, NULL); - if (r == -ENODEV) /* Already gone */ - return 0; - if (r < 0) - return log_error_errno(r, "Failed to remove interface %s: %m", name); - - return 1; -} - -static int generate_mac( - const char *machine_name, - struct ether_addr *mac, - sd_id128_t hash_key, - uint64_t idx) { - - uint64_t result; - size_t l, sz; - uint8_t *v, *i; - int r; - - l = strlen(machine_name); - 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), machine_name, 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. */ - result = htole64(siphash24(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 add_veth( - sd_netlink *rtnl, - pid_t pid, - const char *ifname_host, - const struct ether_addr *mac_host, - const char *ifname_container, - const struct ether_addr *mac_container) { - - _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; - int r; - - assert(rtnl); - assert(ifname_host); - assert(mac_host); - assert(ifname_container); - assert(mac_container); - - 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, ifname_host); - 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, ifname_container); - 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 (%s:%s): %m", ifname_host, ifname_container); - - return 0; -} - -int setup_veth(const char *machine_name, - pid_t pid, - char iface_name[IFNAMSIZ], - bool bridge) { - - _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; - struct ether_addr mac_host, mac_container; - int r, i; - - assert(machine_name); - assert(pid > 0); - assert(iface_name); - - /* Use two different interface name prefixes depending whether - * we are in bridge mode or not. */ - snprintf(iface_name, IFNAMSIZ - 1, "%s-%s", - bridge ? "vb" : "ve", machine_name); - - r = generate_mac(machine_name, &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(machine_name, &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 = add_veth(rtnl, pid, iface_name, &mac_host, "host0", &mac_container); - if (r < 0) - return r; - - i = (int) if_nametoindex(iface_name); - if (i <= 0) - return log_error_errno(errno, "Failed to resolve interface %s: %m", iface_name); - - return i; -} - -int setup_veth_extra( - const char *machine_name, - pid_t pid, - char **pairs) { - - _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; - uint64_t idx = 0; - char **a, **b; - int r; - - assert(machine_name); - assert(pid > 0); - - if (strv_isempty(pairs)) - return 0; - - r = sd_netlink_open(&rtnl); - if (r < 0) - return log_error_errno(r, "Failed to connect to netlink: %m"); - - STRV_FOREACH_PAIR(a, b, pairs) { - struct ether_addr mac_host, mac_container; - - r = generate_mac(machine_name, &mac_container, VETH_EXTRA_CONTAINER_HASH_KEY, idx); - if (r < 0) - return log_error_errno(r, "Failed to generate predictable MAC address for container side of extra veth link: %m"); - - r = generate_mac(machine_name, &mac_host, VETH_EXTRA_HOST_HASH_KEY, idx); - if (r < 0) - return log_error_errno(r, "Failed to generate predictable MAC address for container side of extra veth link: %m"); - - r = add_veth(rtnl, pid, *a, &mac_host, *b, &mac_container); - if (r < 0) - return r; - - idx++; - } - - return 0; -} - -static int join_bridge(sd_netlink *rtnl, const char *veth_name, const char *bridge_name) { - _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; - int r, bridge_ifi; - - assert(rtnl); - assert(veth_name); - assert(bridge_name); - - bridge_ifi = (int) if_nametoindex(bridge_name); - if (bridge_ifi <= 0) - return -errno; - - r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0); - if (r < 0) - return r; - - r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP); - if (r < 0) - return r; - - r = sd_netlink_message_append_string(m, IFLA_IFNAME, veth_name); - if (r < 0) - return r; - - r = sd_netlink_message_append_u32(m, IFLA_MASTER, bridge_ifi); - if (r < 0) - return r; - - r = sd_netlink_call(rtnl, m, 0, NULL); - if (r < 0) - return r; - - return bridge_ifi; -} - -static int create_bridge(sd_netlink *rtnl, const char *bridge_name) { - _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; - int r; - - r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0); - if (r < 0) - return r; - - r = sd_netlink_message_append_string(m, IFLA_IFNAME, bridge_name); - if (r < 0) - return r; - - r = sd_netlink_message_open_container(m, IFLA_LINKINFO); - if (r < 0) - return r; - - r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "bridge"); - if (r < 0) - return r; - - r = sd_netlink_message_close_container(m); - if (r < 0) - return r; - - r = sd_netlink_message_close_container(m); - if (r < 0) - return r; - - r = sd_netlink_call(rtnl, m, 0, NULL); - if (r < 0) - return r; - - return 0; -} - -int setup_bridge(const char *veth_name, const char *bridge_name, bool create) { - _cleanup_release_lock_file_ LockFile bridge_lock = LOCK_FILE_INIT; - _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; - int r, bridge_ifi; - unsigned n = 0; - - assert(veth_name); - assert(bridge_name); - - r = sd_netlink_open(&rtnl); - if (r < 0) - return log_error_errno(r, "Failed to connect to netlink: %m"); - - if (create) { - /* We take a system-wide lock here, so that we can safely check whether there's still a member in the - * bridge before removing it, without risking interference from other nspawn instances. */ - - r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock); - if (r < 0) - return log_error_errno(r, "Failed to take network zone lock: %m"); - } - - for (;;) { - bridge_ifi = join_bridge(rtnl, veth_name, bridge_name); - if (bridge_ifi >= 0) - return bridge_ifi; - if (bridge_ifi != -ENODEV || !create || n > 10) - return log_error_errno(bridge_ifi, "Failed to add interface %s to bridge %s: %m", veth_name, bridge_name); - - /* Count attempts, so that we don't enter an endless loop here. */ - n++; - - /* The bridge doesn't exist yet. Let's create it */ - r = create_bridge(rtnl, bridge_name); - if (r < 0) - return log_error_errno(r, "Failed to create bridge interface %s: %m", bridge_name); - - /* Try again, now that the bridge exists */ - } -} - -int remove_bridge(const char *bridge_name) { - _cleanup_release_lock_file_ LockFile bridge_lock = LOCK_FILE_INIT; - _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; - const char *path; - int r; - - /* Removes the specified bridge, but only if it is currently empty */ - - if (isempty(bridge_name)) - return 0; - - r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock); - if (r < 0) - return log_error_errno(r, "Failed to take network zone lock: %m"); - - path = strjoina("/sys/class/net/", bridge_name, "/brif"); - - r = dir_is_empty(path); - if (r == -ENOENT) /* Already gone? */ - return 0; - if (r < 0) - return log_error_errno(r, "Can't detect if bridge %s is empty: %m", bridge_name); - if (r == 0) /* Still populated, leave it around */ - return 0; - - r = sd_netlink_open(&rtnl); - if (r < 0) - return log_error_errno(r, "Failed to connect to netlink: %m"); - - return remove_one_link(rtnl, bridge_name); -} - -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; -} - -int move_network_interfaces(pid_t pid, char **ifaces) { - _cleanup_udev_unref_ struct udev *udev = NULL; - _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; - char **i; - int r; - - if (strv_isempty(ifaces)) - 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, ifaces) { - _cleanup_(sd_netlink_message_unrefp) 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; -} - -int setup_macvlan(const char *machine_name, pid_t pid, char **ifaces) { - _cleanup_udev_unref_ struct udev *udev = NULL; - _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; - unsigned idx = 0; - char **i; - int r; - - if (strv_isempty(ifaces)) - 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, ifaces) { - _cleanup_(sd_netlink_message_unrefp) 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(machine_name, &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; -} - -int setup_ipvlan(const char *machine_name, pid_t pid, char **ifaces) { - _cleanup_udev_unref_ struct udev *udev = NULL; - _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; - char **i; - int r; - - if (strv_isempty(ifaces)) - 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, ifaces) { - _cleanup_(sd_netlink_message_unrefp) 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; -} - -int veth_extra_parse(char ***l, const char *p) { - _cleanup_free_ char *a = NULL, *b = NULL; - int r; - - r = extract_first_word(&p, &a, ":", EXTRACT_DONT_COALESCE_SEPARATORS); - if (r < 0) - return r; - if (r == 0 || !ifname_valid(a)) - return -EINVAL; - - r = extract_first_word(&p, &b, ":", EXTRACT_DONT_COALESCE_SEPARATORS); - if (r < 0) - return r; - if (r == 0 || !ifname_valid(b)) { - free(b); - b = strdup(a); - if (!b) - return -ENOMEM; - } - - if (p) - return -EINVAL; - - r = strv_push_pair(l, a, b); - if (r < 0) - return -ENOMEM; - - a = b = NULL; - return 0; -} - -int remove_veth_links(const char *primary, char **pairs) { - _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; - char **a, **b; - int r; - - /* In some cases the kernel might pin the veth links between host and container even after the namespace - * died. Hence, let's better remove them explicitly too. */ - - if (isempty(primary) && strv_isempty(pairs)) - return 0; - - r = sd_netlink_open(&rtnl); - if (r < 0) - return log_error_errno(r, "Failed to connect to netlink: %m"); - - remove_one_link(rtnl, primary); - - STRV_FOREACH_PAIR(a, b, pairs) - remove_one_link(rtnl, *a); - - return 0; -} |