/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2013 Tom Gundersen <teg@jklm.no> 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 <net/if.h> #include "conf-files.h" #include "conf-parser.h" #include "list.h" #include "siphash24.h" #include "netlink-util.h" #include "network-internal.h" #include "networkd.h" #include "networkd-netdev.h" const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = { [NETDEV_KIND_BRIDGE] = &bridge_vtable, [NETDEV_KIND_BOND] = &bond_vtable, [NETDEV_KIND_VLAN] = &vlan_vtable, [NETDEV_KIND_MACVLAN] = &macvlan_vtable, [NETDEV_KIND_MACVTAP] = &macvtap_vtable, [NETDEV_KIND_IPVLAN] = &ipvlan_vtable, [NETDEV_KIND_VXLAN] = &vxlan_vtable, [NETDEV_KIND_IPIP] = &ipip_vtable, [NETDEV_KIND_GRE] = &gre_vtable, [NETDEV_KIND_GRETAP] = &gretap_vtable, [NETDEV_KIND_IP6GRE] = &ip6gre_vtable, [NETDEV_KIND_IP6GRETAP] = &ip6gretap_vtable, [NETDEV_KIND_SIT] = &sit_vtable, [NETDEV_KIND_VTI] = &vti_vtable, [NETDEV_KIND_VTI6] = &vti6_vtable, [NETDEV_KIND_VETH] = &veth_vtable, [NETDEV_KIND_DUMMY] = &dummy_vtable, [NETDEV_KIND_TUN] = &tun_vtable, [NETDEV_KIND_TAP] = &tap_vtable, [NETDEV_KIND_IP6TNL] = &ip6tnl_vtable, }; static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = { [NETDEV_KIND_BRIDGE] = "bridge", [NETDEV_KIND_BOND] = "bond", [NETDEV_KIND_VLAN] = "vlan", [NETDEV_KIND_MACVLAN] = "macvlan", [NETDEV_KIND_MACVTAP] = "macvtap", [NETDEV_KIND_IPVLAN] = "ipvlan", [NETDEV_KIND_VXLAN] = "vxlan", [NETDEV_KIND_IPIP] = "ipip", [NETDEV_KIND_GRE] = "gre", [NETDEV_KIND_GRETAP] = "gretap", [NETDEV_KIND_IP6GRE] = "ip6gre", [NETDEV_KIND_IP6GRETAP] = "ip6gretap", [NETDEV_KIND_SIT] = "sit", [NETDEV_KIND_VETH] = "veth", [NETDEV_KIND_VTI] = "vti", [NETDEV_KIND_VTI6] = "vti6", [NETDEV_KIND_DUMMY] = "dummy", [NETDEV_KIND_TUN] = "tun", [NETDEV_KIND_TAP] = "tap", [NETDEV_KIND_IP6TNL] = "ip6tnl", }; DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind); DEFINE_CONFIG_PARSE_ENUM(config_parse_netdev_kind, netdev_kind, NetDevKind, "Failed to parse netdev kind"); static void netdev_cancel_callbacks(NetDev *netdev) { _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; netdev_join_callback *callback; if (!netdev) return; rtnl_message_new_synthetic_error(-ENODEV, 0, &m); while ((callback = netdev->callbacks)) { if (m) { assert(callback->link); assert(callback->callback); assert(netdev->manager); assert(netdev->manager->rtnl); callback->callback(netdev->manager->rtnl, m, callback->link); } LIST_REMOVE(callbacks, netdev->callbacks, callback); link_unref(callback->link); free(callback); } } static void netdev_free(NetDev *netdev) { if (!netdev) return; netdev_cancel_callbacks(netdev); if (netdev->ifname) hashmap_remove(netdev->manager->netdevs, netdev->ifname); free(netdev->filename); free(netdev->description); free(netdev->ifname); free(netdev->mac); condition_free_list(netdev->match_host); condition_free_list(netdev->match_virt); condition_free_list(netdev->match_kernel); condition_free_list(netdev->match_arch); if (NETDEV_VTABLE(netdev) && NETDEV_VTABLE(netdev)->done) NETDEV_VTABLE(netdev)->done(netdev); free(netdev); } NetDev *netdev_unref(NetDev *netdev) { if (netdev && (-- netdev->n_ref <= 0)) netdev_free(netdev); return NULL; } NetDev *netdev_ref(NetDev *netdev) { if (netdev) assert_se(++ netdev->n_ref >= 2); return netdev; } void netdev_drop(NetDev *netdev) { if (!netdev || netdev->state == NETDEV_STATE_LINGER) return; netdev->state = NETDEV_STATE_LINGER; log_netdev_debug(netdev, "netdev removed"); netdev_cancel_callbacks(netdev); netdev_unref(netdev); return; } int netdev_get(Manager *manager, const char *name, NetDev **ret) { NetDev *netdev; assert(manager); assert(name); assert(ret); netdev = hashmap_get(manager->netdevs, name); if (!netdev) { *ret = NULL; return -ENOENT; } *ret = netdev; return 0; } static int netdev_enter_failed(NetDev *netdev) { netdev->state = NETDEV_STATE_FAILED; netdev_cancel_callbacks(netdev); return 0; } static int netdev_enslave_ready(NetDev *netdev, Link* link, sd_netlink_message_handler_t callback) { _cleanup_netlink_message_unref_ sd_netlink_message *req = NULL; int r; assert(netdev); assert(netdev->state == NETDEV_STATE_READY); assert(netdev->manager); assert(netdev->manager->rtnl); assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND)); assert(link); assert(callback); r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req, RTM_SETLINK, link->ifindex); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not allocate RTM_SETLINK message: %m"); r = sd_netlink_message_append_u32(req, IFLA_MASTER, netdev->ifindex); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_MASTER attribute: %m"); r = sd_netlink_call_async(netdev->manager->rtnl, req, callback, link, 0, NULL); if (r < 0) return log_netdev_error(netdev, "Could not send rtnetlink message: %m"); link_ref(link); log_netdev_debug(netdev, "Enslaving link '%s'", link->ifname); return 0; } static int netdev_enter_ready(NetDev *netdev) { netdev_join_callback *callback, *callback_next; int r; assert(netdev); assert(netdev->ifname); if (netdev->state != NETDEV_STATE_CREATING) return 0; netdev->state = NETDEV_STATE_READY; log_netdev_info(netdev, "netdev ready"); LIST_FOREACH_SAFE(callbacks, callback, callback_next, netdev->callbacks) { /* enslave the links that were attempted to be enslaved before the * link was ready */ r = netdev_enslave_ready(netdev, callback->link, callback->callback); if (r < 0) return r; LIST_REMOVE(callbacks, netdev->callbacks, callback); link_unref(callback->link); free(callback); } return 0; } /* callback for netdev's created without a backing Link */ static int netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) { _cleanup_netdev_unref_ NetDev *netdev = userdata; int r; assert(netdev->state != _NETDEV_STATE_INVALID); r = sd_netlink_message_get_errno(m); if (r == -EEXIST) log_netdev_info(netdev, "netdev exists, using existing without changing its parameters"); else if (r < 0) { log_netdev_warning_errno(netdev, r, "netdev could not be created: %m"); netdev_drop(netdev); return 1; } log_netdev_debug(netdev, "Created"); return 1; } int netdev_enslave(NetDev *netdev, Link *link, sd_netlink_message_handler_t callback) { int r; assert(netdev); assert(netdev->manager); assert(netdev->manager->rtnl); assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND)); if (netdev->state == NETDEV_STATE_READY) { r = netdev_enslave_ready(netdev, link, callback); if (r < 0) return r; } else if (IN_SET(netdev->state, NETDEV_STATE_LINGER, NETDEV_STATE_FAILED)) { _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; r = rtnl_message_new_synthetic_error(-ENODEV, 0, &m); if (r >= 0) callback(netdev->manager->rtnl, m, link); } else { /* the netdev is not yet read, save this request for when it is */ netdev_join_callback *cb; cb = new0(netdev_join_callback, 1); if (!cb) return log_oom(); cb->callback = callback; cb->link = link; link_ref(link); LIST_PREPEND(callbacks, netdev->callbacks, cb); log_netdev_debug(netdev, "Will enslave '%s', when ready", link->ifname); } return 0; } int netdev_set_ifindex(NetDev *netdev, sd_netlink_message *message) { uint16_t type; const char *kind; const char *received_kind; const char *received_name; int r, ifindex; assert(netdev); assert(message); r = sd_netlink_message_get_type(message, &type); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not get rtnl message type: %m"); if (type != RTM_NEWLINK) { log_netdev_error(netdev, "Cannot set ifindex from unexpected rtnl message type."); return -EINVAL; } r = sd_rtnl_message_link_get_ifindex(message, &ifindex); if (r < 0) { log_netdev_error_errno(netdev, r, "Could not get ifindex: %m"); netdev_enter_failed(netdev); return r; } else if (ifindex <= 0) { log_netdev_error(netdev, "Got invalid ifindex: %d", ifindex); netdev_enter_failed(netdev); return -EINVAL; } if (netdev->ifindex > 0) { if (netdev->ifindex != ifindex) { log_netdev_error(netdev, "Could not set ifindex to %d, already set to %d", ifindex, netdev->ifindex); netdev_enter_failed(netdev); return -EEXIST; } else /* ifindex already set to the same for this netdev */ return 0; } r = sd_netlink_message_read_string(message, IFLA_IFNAME, &received_name); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not get IFNAME: %m"); if (!streq(netdev->ifname, received_name)) { log_netdev_error(netdev, "Received newlink with wrong IFNAME %s", received_name); netdev_enter_failed(netdev); return r; } r = sd_netlink_message_enter_container(message, IFLA_LINKINFO); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not get LINKINFO: %m"); r = sd_netlink_message_read_string(message, IFLA_INFO_KIND, &received_kind); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not get KIND: %m"); r = sd_netlink_message_exit_container(message); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not exit container: %m"); if (netdev->kind == NETDEV_KIND_TAP) /* the kernel does not distinguish between tun and tap */ kind = "tun"; else { kind = netdev_kind_to_string(netdev->kind); if (!kind) { log_netdev_error(netdev, "Could not get kind"); netdev_enter_failed(netdev); return -EINVAL; } } if (!streq(kind, received_kind)) { log_netdev_error(netdev, "Received newlink with wrong KIND %s, " "expected %s", received_kind, kind); netdev_enter_failed(netdev); return r; } netdev->ifindex = ifindex; log_netdev_debug(netdev, "netdev has index %d", netdev->ifindex); netdev_enter_ready(netdev); return 0; } #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48) int netdev_get_mac(const char *ifname, struct ether_addr **ret) { _cleanup_free_ struct ether_addr *mac = NULL; uint8_t result[8]; size_t l, sz; uint8_t *v; int r; assert(ifname); assert(ret); mac = new0(struct ether_addr, 1); if (!mac) return -ENOMEM; l = strlen(ifname); sz = sizeof(sd_id128_t) + l; v = alloca(sz); /* fetch some persistent data unique to the machine */ r = sd_id128_get_machine((sd_id128_t*) v); if (r < 0) return r; /* combine with some data unique (on this machine) to this * netdev */ memcpy(v + sizeof(sd_id128_t), ifname, l); /* 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) */ *ret = mac; mac = NULL; return 0; } static int netdev_create(NetDev *netdev, Link *link, sd_netlink_message_handler_t callback) { int r; assert(netdev); assert(!link || callback); /* create netdev */ if (NETDEV_VTABLE(netdev)->create) { assert(!link); r = NETDEV_VTABLE(netdev)->create(netdev); if (r < 0) return r; log_netdev_debug(netdev, "Created"); } else { _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not allocate RTM_NEWLINK message: %m"); r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IFNAME, attribute: %m"); if (netdev->mac) { r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, netdev->mac); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_ADDRESS attribute: %m"); } if (netdev->mtu) { r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_MTU attribute: %m"); } if (link) { r = sd_netlink_message_append_u32(m, IFLA_LINK, link->ifindex); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINK attribute: %m"); } r = sd_netlink_message_open_container(m, IFLA_LINKINFO); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m"); r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind)); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m"); if (NETDEV_VTABLE(netdev)->fill_message_create) { r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m); if (r < 0) return r; } r = sd_netlink_message_close_container(m); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m"); r = sd_netlink_message_close_container(m); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m"); if (link) { r = sd_netlink_call_async(netdev->manager->rtnl, m, callback, link, 0, NULL); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m"); link_ref(link); } else { r = sd_netlink_call_async(netdev->manager->rtnl, m, netdev_create_handler, netdev, 0, NULL); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m"); netdev_ref(netdev); } netdev->state = NETDEV_STATE_CREATING; log_netdev_debug(netdev, "Creating"); } return 0; } /* the callback must be called, possibly after a timeout, as otherwise the Link will hang */ int netdev_join(NetDev *netdev, Link *link, sd_netlink_message_handler_t callback) { int r; assert(netdev); assert(netdev->manager); assert(netdev->manager->rtnl); assert(NETDEV_VTABLE(netdev)); switch (NETDEV_VTABLE(netdev)->create_type) { case NETDEV_CREATE_MASTER: r = netdev_enslave(netdev, link, callback); if (r < 0) return r; break; case NETDEV_CREATE_STACKED: r = netdev_create(netdev, link, callback); if (r < 0) return r; break; default: assert_not_reached("Can not join independent netdev"); } return 0; } static int netdev_load_one(Manager *manager, const char *filename) { _cleanup_netdev_unref_ NetDev *netdev = NULL; _cleanup_free_ NetDev *netdev_raw = NULL; _cleanup_fclose_ FILE *file = NULL; int r; assert(manager); assert(filename); file = fopen(filename, "re"); if (!file) { if (errno == ENOENT) return 0; else return -errno; } if (null_or_empty_fd(fileno(file))) { log_debug("Skipping empty file: %s", filename); return 0; } netdev_raw = new0(NetDev, 1); if (!netdev_raw) return log_oom(); netdev_raw->kind = _NETDEV_KIND_INVALID; r = config_parse(NULL, filename, file, "Match\0NetDev\0", config_item_perf_lookup, network_netdev_gperf_lookup, true, false, true, netdev_raw); if (r < 0) return r; r = fseek(file, 0, SEEK_SET); if (r < 0) return -errno; /* skip out early if configuration does not match the environment */ if (net_match_config(NULL, NULL, NULL, NULL, NULL, netdev_raw->match_host, netdev_raw->match_virt, netdev_raw->match_kernel, netdev_raw->match_arch, NULL, NULL, NULL, NULL, NULL, NULL) <= 0) return 0; if (!NETDEV_VTABLE(netdev_raw)) { log_warning("NetDev with invalid Kind configured in %s. Ignoring", filename); return 0; } if (!netdev_raw->ifname) { log_warning("NetDev without Name configured in %s. Ignoring", filename); return 0; } netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size); if (!netdev) return log_oom(); netdev->n_ref = 1; netdev->manager = manager; netdev->state = _NETDEV_STATE_INVALID; netdev->kind = netdev_raw->kind; netdev->ifname = netdev_raw->ifname; if (NETDEV_VTABLE(netdev)->init) NETDEV_VTABLE(netdev)->init(netdev); r = config_parse(NULL, filename, file, NETDEV_VTABLE(netdev)->sections, config_item_perf_lookup, network_netdev_gperf_lookup, false, false, false, netdev); if (r < 0) return r; /* verify configuration */ if (NETDEV_VTABLE(netdev)->config_verify) { r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename); if (r < 0) return 0; } netdev->filename = strdup(filename); if (!netdev->filename) return log_oom(); if (!netdev->mac) { r = netdev_get_mac(netdev->ifname, &netdev->mac); if (r < 0) return log_error_errno(r, "Failed to generate predictable MAC address for %s: %m", netdev->ifname); } r = hashmap_put(netdev->manager->netdevs, netdev->ifname, netdev); if (r < 0) return r; LIST_HEAD_INIT(netdev->callbacks); log_netdev_debug(netdev, "loaded %s", netdev_kind_to_string(netdev->kind)); switch (NETDEV_VTABLE(netdev)->create_type) { case NETDEV_CREATE_MASTER: case NETDEV_CREATE_INDEPENDENT: r = netdev_create(netdev, NULL, NULL); if (r < 0) return 0; break; default: break; } netdev = NULL; return 0; } int netdev_load(Manager *manager) { _cleanup_strv_free_ char **files = NULL; NetDev *netdev; char **f; int r; assert(manager); while ((netdev = hashmap_first(manager->netdevs))) netdev_unref(netdev); r = conf_files_list_strv(&files, ".netdev", NULL, network_dirs); if (r < 0) return log_error_errno(r, "Failed to enumerate netdev files: %m"); STRV_FOREACH_BACKWARDS(f, files) { r = netdev_load_one(manager, *f); if (r < 0) return r; } return 0; }