| /*** |
| 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; |
| } |