| /*-*- 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 <netinet/ether.h> |
| #include <linux/if.h> |
| |
| #include "networkd.h" |
| #include "libudev-private.h" |
| #include "util.h" |
| #include "bus-util.h" |
| #include "network-internal.h" |
| |
| #include "dhcp-lease-internal.h" |
| |
| int link_new(Manager *manager, struct udev_device *device, Link **ret) { |
| _cleanup_link_free_ Link *link = NULL; |
| const char *ifname; |
| int r; |
| |
| assert(manager); |
| assert(manager->links); |
| assert(device); |
| assert(ret); |
| |
| link = new0(Link, 1); |
| if (!link) |
| return -ENOMEM; |
| |
| link->manager = manager; |
| link->state = _LINK_STATE_INVALID; |
| |
| link->ifindex = udev_device_get_ifindex(device); |
| if (link->ifindex <= 0) |
| return -EINVAL; |
| |
| r = asprintf(&link->state_file, "/run/systemd/network/links/%"PRIu64, |
| link->ifindex); |
| if (r < 0) |
| return -ENOMEM; |
| |
| ifname = udev_device_get_sysname(device); |
| link->ifname = strdup(ifname); |
| |
| r = hashmap_put(manager->links, &link->ifindex, link); |
| if (r < 0) |
| return r; |
| |
| link->udev_device = udev_device_ref(device); |
| |
| *ret = link; |
| link = NULL; |
| |
| return 0; |
| } |
| |
| void link_free(Link *link) { |
| if (!link) |
| return; |
| |
| assert(link->manager); |
| |
| sd_dhcp_client_free(link->dhcp_client); |
| sd_dhcp_lease_unref(link->dhcp_lease); |
| |
| sd_ipv4ll_free(link->ipv4ll); |
| |
| hashmap_remove(link->manager->links, &link->ifindex); |
| |
| free(link->ifname); |
| free(link->state_file); |
| |
| udev_device_unref(link->udev_device); |
| |
| free(link); |
| } |
| |
| int link_get(Manager *m, int ifindex, Link **ret) { |
| Link *link; |
| uint64_t ifindex_64; |
| |
| assert(m); |
| assert(m->links); |
| assert(ifindex); |
| assert(ret); |
| |
| ifindex_64 = ifindex; |
| link = hashmap_get(m->links, &ifindex_64); |
| if (!link) |
| return -ENODEV; |
| |
| *ret = link; |
| |
| return 0; |
| } |
| |
| static int link_enter_configured(Link *link) { |
| assert(link); |
| assert(link->state == LINK_STATE_SETTING_ROUTES); |
| |
| log_info_link(link, "link configured"); |
| |
| link->state = LINK_STATE_CONFIGURED; |
| |
| link_save(link); |
| |
| return 0; |
| } |
| |
| static void link_enter_failed(Link *link) { |
| assert(link); |
| |
| log_warning_link(link, "failed"); |
| |
| link->state = LINK_STATE_FAILED; |
| |
| link_save(link); |
| } |
| |
| static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { |
| Link *link = userdata; |
| int r; |
| |
| assert(link->route_messages > 0); |
| assert(link->state == LINK_STATE_SETTING_ADDRESSES || |
| link->state == LINK_STATE_SETTING_ROUTES || |
| link->state == LINK_STATE_FAILED); |
| |
| link->route_messages --; |
| |
| if (link->state == LINK_STATE_FAILED) |
| return 1; |
| |
| r = sd_rtnl_message_get_errno(m); |
| if (r < 0 && r != -EEXIST) |
| log_struct_link(LOG_WARNING, link, |
| "MESSAGE=%s: could not set route: %s", |
| link->ifname, strerror(-r), |
| "ERRNO=%d", -r, |
| NULL); |
| |
| /* we might have received an old reply after moving back to SETTING_ADDRESSES, |
| * ignore it */ |
| if (link->route_messages == 0 && link->state == LINK_STATE_SETTING_ROUTES) { |
| log_debug_link(link, "routes set"); |
| link_enter_configured(link); |
| } |
| |
| return 1; |
| } |
| |
| static int link_enter_set_routes(Link *link) { |
| Route *rt; |
| struct in_addr a; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(link->state == LINK_STATE_SETTING_ADDRESSES); |
| |
| link->state = LINK_STATE_SETTING_ROUTES; |
| |
| if (!link->network->static_routes && !link->dhcp_lease && |
| (!link->ipv4ll || sd_ipv4ll_get_address(link->ipv4ll, &a) < 0)) |
| return link_enter_configured(link); |
| |
| log_debug_link(link, "setting routes"); |
| |
| LIST_FOREACH(static_routes, rt, link->network->static_routes) { |
| r = route_configure(rt, link, &route_handler); |
| if (r < 0) { |
| log_warning_link(link, |
| "could not set routes: %s", strerror(-r)); |
| link_enter_failed(link); |
| return r; |
| } |
| |
| link->route_messages ++; |
| } |
| |
| if (link->ipv4ll && !link->dhcp_lease) { |
| _cleanup_route_free_ Route *route = NULL; |
| struct in_addr addr; |
| |
| r = sd_ipv4ll_get_address(link->ipv4ll, &addr); |
| if (r < 0 && r != -ENOENT) { |
| log_warning_link(link, "IPV4LL error: no address: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| if (r != -ENOENT) { |
| r = route_new_dynamic(&route); |
| if (r < 0) { |
| log_error_link(link, "Could not allocate route: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| route->family = AF_INET; |
| route->scope = RT_SCOPE_LINK; |
| route->metrics = 99; |
| |
| r = route_configure(route, link, &route_handler); |
| if (r < 0) { |
| log_warning_link(link, |
| "could not set routes: %s", strerror(-r)); |
| link_enter_failed(link); |
| return r; |
| } |
| |
| link->route_messages ++; |
| } |
| } |
| |
| if (link->dhcp_lease) { |
| _cleanup_route_free_ Route *route = NULL; |
| _cleanup_route_free_ Route *route_gw = NULL; |
| struct in_addr gateway; |
| |
| r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway); |
| if (r < 0) { |
| log_warning_link(link, "DHCP error: no router: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| r = route_new_dynamic(&route); |
| if (r < 0) { |
| log_error_link(link, "Could not allocate route: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| r = route_new_dynamic(&route_gw); |
| if (r < 0) { |
| log_error_link(link, "Could not allocate route: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| /* The dhcp netmask may mask out the gateway. Add an explicit |
| * route for the gw host so that we can route no matter the |
| * netmask or existing kernel route tables. */ |
| route_gw->family = AF_INET; |
| route_gw->dst_addr.in = gateway; |
| route_gw->dst_prefixlen = 32; |
| route_gw->scope = RT_SCOPE_LINK; |
| |
| r = route_configure(route_gw, link, &route_handler); |
| if (r < 0) { |
| log_warning_link(link, |
| "could not set host route: %s", strerror(-r)); |
| return r; |
| } |
| |
| link->route_messages ++; |
| |
| route->family = AF_INET; |
| route->in_addr.in = gateway; |
| |
| r = route_configure(route, link, &route_handler); |
| if (r < 0) { |
| log_warning_link(link, |
| "could not set routes: %s", strerror(-r)); |
| link_enter_failed(link); |
| return r; |
| } |
| |
| link->route_messages ++; |
| } |
| |
| return 0; |
| } |
| |
| static int route_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { |
| Link *link = userdata; |
| int r; |
| |
| assert(m); |
| assert(link); |
| assert(link->ifname); |
| |
| if (link->state == LINK_STATE_FAILED) |
| return 1; |
| |
| r = sd_rtnl_message_get_errno(m); |
| if (r < 0 && r != -ENOENT) |
| log_struct_link(LOG_WARNING, link, |
| "MESSAGE=%s: could not drop route: %s", |
| link->ifname, strerror(-r), |
| "ERRNO=%d", -r, |
| NULL); |
| |
| return 0; |
| } |
| |
| static int address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { |
| Link *link = userdata; |
| int r; |
| |
| assert(m); |
| assert(link); |
| assert(link->ifname); |
| assert(link->addr_messages > 0); |
| assert(link->state == LINK_STATE_SETTING_ADDRESSES || link->state == LINK_STATE_FAILED); |
| |
| link->addr_messages --; |
| |
| if (link->state == LINK_STATE_FAILED) |
| return 1; |
| |
| r = sd_rtnl_message_get_errno(m); |
| if (r < 0 && r != -EEXIST) |
| log_struct_link(LOG_WARNING, link, |
| "MESSAGE=%s: could not set address: %s", |
| link->ifname, strerror(-r), |
| "ERRNO=%d", -r, |
| NULL); |
| |
| if (link->addr_messages == 0) { |
| log_debug_link(link, "addresses set"); |
| link_enter_set_routes(link); |
| } |
| |
| return 1; |
| } |
| |
| static int link_enter_set_addresses(Link *link) { |
| Address *ad; |
| struct in_addr a; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(link->state != _LINK_STATE_INVALID); |
| |
| link->state = LINK_STATE_SETTING_ADDRESSES; |
| |
| if (!link->network->static_addresses && !link->dhcp_lease && |
| (!link->ipv4ll || sd_ipv4ll_get_address(link->ipv4ll, &a) < 0)) |
| return link_enter_set_routes(link); |
| |
| log_debug_link(link, "setting addresses"); |
| |
| LIST_FOREACH(static_addresses, ad, link->network->static_addresses) { |
| r = address_configure(ad, link, &address_handler); |
| if (r < 0) { |
| log_warning_link(link, |
| "could not set addresses: %s", strerror(-r)); |
| link_enter_failed(link); |
| return r; |
| } |
| |
| link->addr_messages ++; |
| } |
| |
| if (link->ipv4ll && !link->dhcp_lease) { |
| _cleanup_address_free_ Address *ll_addr = NULL; |
| struct in_addr addr; |
| |
| r = sd_ipv4ll_get_address(link->ipv4ll, &addr); |
| if (r < 0 && r != -ENOENT) { |
| log_warning_link(link, "IPV4LL error: no address: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| if (r != -ENOENT) { |
| r = address_new_dynamic(&ll_addr); |
| if (r < 0) { |
| log_error_link(link, "Could not allocate address: %s", strerror(-r)); |
| return r; |
| } |
| |
| ll_addr->family = AF_INET; |
| ll_addr->in_addr.in = addr; |
| ll_addr->prefixlen = 16; |
| ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htonl(0xfffffffflu >> ll_addr->prefixlen); |
| ll_addr->scope = RT_SCOPE_LINK; |
| |
| r = address_configure(ll_addr, link, &address_handler); |
| if (r < 0) { |
| log_warning_link(link, |
| "could not set addresses: %s", strerror(-r)); |
| link_enter_failed(link); |
| return r; |
| } |
| |
| link->addr_messages ++; |
| } |
| } |
| |
| if (link->dhcp_lease) { |
| _cleanup_address_free_ Address *address = NULL; |
| struct in_addr addr; |
| struct in_addr netmask; |
| unsigned prefixlen; |
| |
| r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr); |
| if (r < 0) { |
| log_warning_link(link, "DHCP error: no address: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask); |
| if (r < 0) { |
| log_warning_link(link, "DHCP error: no netmask: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| prefixlen = net_netmask_to_prefixlen(&netmask); |
| |
| r = address_new_dynamic(&address); |
| if (r < 0) { |
| log_error_link(link, "Could not allocate address: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| address->family = AF_INET; |
| address->in_addr.in = addr; |
| address->prefixlen = prefixlen; |
| address->broadcast.s_addr = addr.s_addr | ~netmask.s_addr; |
| |
| r = address_configure(address, link, &address_handler); |
| if (r < 0) { |
| log_warning_link(link, |
| "could not set addresses: %s", strerror(-r)); |
| link_enter_failed(link); |
| return r; |
| } |
| |
| link->addr_messages ++; |
| } |
| |
| return 0; |
| } |
| |
| static int address_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { |
| Link *link = userdata; |
| int r; |
| |
| assert(m); |
| assert(link); |
| assert(link->ifname); |
| |
| if (link->state == LINK_STATE_FAILED) |
| return 1; |
| |
| r = sd_rtnl_message_get_errno(m); |
| if (r < 0 && r != -ENOENT) |
| log_struct_link(LOG_WARNING, link, |
| "MESSAGE=%s: could not drop address: %s", |
| link->ifname, strerror(-r), |
| "ERRNO=%d", -r, |
| NULL); |
| |
| return 0; |
| } |
| |
| static int set_hostname_handler(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *ret_error) { |
| int r; |
| |
| r = sd_bus_message_get_errno(m); |
| if (r < 0) |
| log_warning("Could not set hostname: %s", strerror(-r)); |
| |
| return 1; |
| } |
| |
| static int set_hostname(sd_bus *bus, const char *hostname) { |
| _cleanup_bus_message_unref_ sd_bus_message *m = NULL; |
| int r = 0; |
| |
| assert(hostname); |
| |
| log_debug("Setting transient hostname: '%s'", hostname); |
| |
| if (!bus) { /* TODO: replace by assert when we can rely on kdbus */ |
| log_info("Not connected to system bus, ignoring transient hostname."); |
| return 0; |
| } |
| |
| r = sd_bus_message_new_method_call( |
| bus, |
| &m, |
| "org.freedesktop.hostname1", |
| "/org/freedesktop/hostname1", |
| "org.freedesktop.hostname1", |
| "SetHostname"); |
| if (r < 0) |
| return r; |
| |
| r = sd_bus_message_append(m, "sb", hostname, false); |
| if (r < 0) |
| return r; |
| |
| r = sd_bus_call_async(bus, m, set_hostname_handler, NULL, 0, NULL); |
| if (r < 0) |
| log_error("Could not set transient hostname: %s", strerror(-r)); |
| |
| return r; |
| } |
| |
| static int set_mtu_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { |
| Link *link = userdata; |
| int r; |
| |
| assert(m); |
| assert(link); |
| assert(link->ifname); |
| |
| if (link->state == LINK_STATE_FAILED) |
| return 1; |
| |
| r = sd_rtnl_message_get_errno(m); |
| if (r < 0) |
| log_struct_link(LOG_WARNING, link, |
| "MESSAGE=%s: could not set MTU: %s", |
| link->ifname, strerror(-r), |
| "ERRNO=%d", -r, |
| NULL); |
| |
| return 1; |
| } |
| |
| static int link_set_mtu(Link *link, uint32_t mtu) { |
| _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL; |
| int r; |
| |
| assert(link); |
| assert(link->manager); |
| assert(link->manager->rtnl); |
| |
| log_debug_link(link, "setting MTU: %" PRIu32, mtu); |
| |
| r = sd_rtnl_message_new_link(link->manager->rtnl, &req, |
| RTM_SETLINK, link->ifindex); |
| if (r < 0) { |
| log_error_link(link, "Could not allocate RTM_SETLINK message"); |
| return r; |
| } |
| |
| r = sd_rtnl_message_append_u32(req, IFLA_MTU, mtu); |
| if (r < 0) { |
| log_error_link(link, "Could not append MTU: %s", strerror(-r)); |
| return r; |
| } |
| |
| r = sd_rtnl_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL); |
| if (r < 0) { |
| log_error_link(link, |
| "Could not send rtnetlink message: %s", strerror(-r)); |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| static int dhcp_lease_lost(Link *link) { |
| _cleanup_address_free_ Address *address = NULL; |
| struct in_addr addr; |
| struct in_addr netmask; |
| unsigned prefixlen; |
| int r; |
| |
| assert(link); |
| assert(link->dhcp_lease); |
| |
| log_warning_link(link, "DHCP lease lost"); |
| |
| r = address_new_dynamic(&address); |
| if (r >= 0) { |
| sd_dhcp_lease_get_address(link->dhcp_lease, &addr); |
| sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask); |
| prefixlen = net_netmask_to_prefixlen(&netmask); |
| |
| address->family = AF_INET; |
| address->in_addr.in = addr; |
| address->prefixlen = prefixlen; |
| |
| address_drop(address, link, &address_drop_handler); |
| } |
| |
| if (link->network->dhcp_mtu) { |
| uint16_t mtu; |
| |
| r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu); |
| if (r >= 0 && link->original_mtu != mtu) { |
| r = link_set_mtu(link, link->original_mtu); |
| if (r < 0) { |
| log_warning_link(link, "DHCP error: could not reset MTU"); |
| link_enter_failed(link); |
| return r; |
| } |
| } |
| } |
| |
| if (link->network->dhcp_hostname) { |
| const char *hostname = NULL; |
| |
| r = sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname); |
| if (r >= 0 && hostname) { |
| r = set_hostname(link->manager->bus, ""); |
| if (r < 0) |
| log_error("Failed to reset transient hostname"); |
| } |
| } |
| |
| link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease); |
| |
| return 0; |
| } |
| |
| static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) { |
| sd_dhcp_lease *lease; |
| struct in_addr address; |
| struct in_addr netmask; |
| struct in_addr gateway; |
| unsigned prefixlen; |
| struct in_addr *nameservers; |
| size_t nameservers_size; |
| int r; |
| |
| assert(client); |
| assert(link); |
| |
| r = sd_dhcp_client_get_lease(client, &lease); |
| if (r < 0) { |
| log_warning_link(link, "DHCP error: no lease: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| r = sd_dhcp_lease_get_address(lease, &address); |
| if (r < 0) { |
| log_warning_link(link, "DHCP error: no address: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| r = sd_dhcp_lease_get_netmask(lease, &netmask); |
| if (r < 0) { |
| log_warning_link(link, "DHCP error: no netmask: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| prefixlen = net_netmask_to_prefixlen(&netmask); |
| |
| r = sd_dhcp_lease_get_router(lease, &gateway); |
| if (r < 0) { |
| log_warning_link(link, "DHCP error: no router: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| log_struct_link(LOG_INFO, link, |
| "MESSAGE=%s: DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u", |
| link->ifname, |
| ADDRESS_FMT_VAL(address), |
| prefixlen, |
| ADDRESS_FMT_VAL(gateway), |
| "ADDRESS=%u.%u.%u.%u", |
| ADDRESS_FMT_VAL(address), |
| "PREFIXLEN=%u", |
| prefixlen, |
| "GATEWAY=%u.%u.%u.%u", |
| ADDRESS_FMT_VAL(gateway), |
| NULL); |
| |
| link->dhcp_lease = lease; |
| |
| if (link->network->dhcp_dns) { |
| r = sd_dhcp_lease_get_dns(lease, &nameservers, &nameservers_size); |
| if (r >= 0) { |
| r = manager_update_resolv_conf(link->manager); |
| if (r < 0) |
| log_error("Failed to update resolv.conf"); |
| } |
| } |
| |
| if (link->network->dhcp_mtu) { |
| uint16_t mtu; |
| |
| r = sd_dhcp_lease_get_mtu(lease, &mtu); |
| if (r >= 0) { |
| r = link_set_mtu(link, mtu); |
| if (r < 0) |
| log_error_link(link, "Failed to set MTU " |
| "to %" PRIu16, mtu); |
| } |
| } |
| |
| if (link->network->dhcp_hostname) { |
| const char *hostname; |
| |
| r = sd_dhcp_lease_get_hostname(lease, &hostname); |
| if (r >= 0) { |
| r = set_hostname(link->manager->bus, hostname); |
| if (r < 0) |
| log_error("Failed to set transient hostname " |
| "to '%s'", hostname); |
| } |
| } |
| |
| link_enter_set_addresses(link); |
| |
| return 0; |
| } |
| |
| static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) { |
| Link *link = userdata; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(link->manager); |
| |
| if (link->state == LINK_STATE_FAILED) |
| return; |
| |
| switch (event) { |
| case DHCP_EVENT_NO_LEASE: |
| log_debug_link(link, "IP address in use."); |
| break; |
| case DHCP_EVENT_EXPIRED: |
| case DHCP_EVENT_STOP: |
| case DHCP_EVENT_IP_CHANGE: |
| if (link->network->dhcp_critical) { |
| log_error_link(link, "DHCPv4 connection considered system critical, " |
| "ignoring request to reconfigure it."); |
| return; |
| } |
| |
| if (link->dhcp_lease) { |
| r = dhcp_lease_lost(link); |
| if (r < 0) { |
| link_enter_failed(link); |
| return; |
| } |
| } |
| |
| if (event == DHCP_EVENT_IP_CHANGE) { |
| r = dhcp_lease_acquired(client, link); |
| if (r < 0) { |
| link_enter_failed(link); |
| return; |
| } |
| } |
| |
| if (event == DHCP_EVENT_EXPIRED && link->network->ipv4ll) { |
| r = sd_ipv4ll_start (link->ipv4ll); |
| if (r < 0) { |
| link_enter_failed(link); |
| return; |
| } |
| } |
| |
| break; |
| case DHCP_EVENT_IP_ACQUIRE: |
| r = dhcp_lease_acquired(client, link); |
| if (r < 0) { |
| link_enter_failed(link); |
| return; |
| } |
| if (link->ipv4ll) { |
| r = sd_ipv4ll_stop(link->ipv4ll); |
| if (r < 0) { |
| link_enter_failed(link); |
| return; |
| } |
| } |
| break; |
| default: |
| if (event < 0) |
| log_warning_link(link, "DHCP error: %s", strerror(-event)); |
| else |
| log_warning_link(link, "DHCP unknown event: %d", event); |
| break; |
| } |
| |
| return; |
| } |
| |
| static int ipv4ll_address_lost(sd_ipv4ll *ll, Link *link) { |
| int r; |
| struct in_addr addr; |
| |
| assert(ll); |
| assert(link); |
| |
| r = sd_ipv4ll_get_address(link->ipv4ll, &addr); |
| if (r >= 0) { |
| _cleanup_address_free_ Address *address = NULL; |
| _cleanup_route_free_ Route *route = NULL; |
| |
| log_debug_link(link, "IPv4 link-local release %u.%u.%u.%u", |
| ADDRESS_FMT_VAL(addr)); |
| |
| r = address_new_dynamic(&address); |
| if (r < 0) { |
| log_error_link(link, "Could not allocate address: %s", strerror(-r)); |
| return r; |
| } |
| |
| address->family = AF_INET; |
| address->in_addr.in = addr; |
| address->prefixlen = 16; |
| address->scope = RT_SCOPE_LINK; |
| |
| address_drop(address, link, &address_drop_handler); |
| |
| r = route_new_dynamic(&route); |
| if (r < 0) { |
| log_error_link(link, "Could not allocate route: %s", |
| strerror(-r)); |
| return r; |
| } |
| |
| route->family = AF_INET; |
| route->scope = RT_SCOPE_LINK; |
| route->metrics = 99; |
| |
| route_drop(route, link, &route_drop_handler); |
| } |
| |
| return 0; |
| } |
| |
| static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) { |
| struct in_addr address; |
| int r; |
| |
| assert(ll); |
| assert(link); |
| |
| r = sd_ipv4ll_get_address(ll, &address); |
| if (r < 0) |
| return r; |
| |
| log_struct_link(LOG_INFO, link, |
| "MESSAGE=%s: IPv4 link-local address %u.%u.%u.%u", |
| link->ifname, |
| ADDRESS_FMT_VAL(address), |
| NULL); |
| |
| link_enter_set_addresses(link); |
| |
| return 0; |
| } |
| |
| static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata){ |
| Link *link = userdata; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(link->manager); |
| |
| switch(event) { |
| case IPV4LL_EVENT_STOP: |
| case IPV4LL_EVENT_CONFLICT: |
| r = ipv4ll_address_lost(ll, link); |
| if (r < 0) { |
| link_enter_failed(link); |
| return; |
| } |
| break; |
| case IPV4LL_EVENT_BIND: |
| r = ipv4ll_address_claimed(ll, link); |
| if (r < 0) { |
| link_enter_failed(link); |
| return; |
| } |
| break; |
| default: |
| if (event < 0) |
| log_warning_link(link, "IPv4 link-local error: %s", strerror(-event)); |
| else |
| log_warning_link(link, "IPv4 link-local unknown event: %d", event); |
| break; |
| } |
| } |
| |
| static int link_acquire_conf(Link *link) { |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(link->manager); |
| assert(link->manager->event); |
| |
| if (link->network->ipv4ll) { |
| assert(link->ipv4ll); |
| |
| log_debug_link(link, "acquiring IPv4 link-local address"); |
| |
| r = sd_ipv4ll_start(link->ipv4ll); |
| if (r < 0) |
| return r; |
| } |
| |
| if (link->network->dhcp) { |
| assert(link->dhcp_client); |
| |
| log_debug_link(link, "acquiring DHCPv4 lease"); |
| |
| r = sd_dhcp_client_start(link->dhcp_client); |
| if (r < 0) |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| static int link_update_flags(Link *link, unsigned flags) { |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| |
| if (link->state == LINK_STATE_FAILED) |
| return 0; |
| |
| if (link->flags == flags) |
| return 0; |
| |
| log_debug_link(link, "link status updated: %#.8x -> %#.8x", |
| link->flags, flags); |
| |
| if ((link->flags & IFF_UP) != (flags & IFF_UP)) |
| log_info_link(link, |
| "link is %s", flags & IFF_UP ? "up": "down"); |
| |
| if ((link->flags & IFF_LOWER_UP) != (flags & IFF_LOWER_UP)) { |
| if (flags & IFF_LOWER_UP) { |
| log_info_link(link, "carrier on"); |
| |
| if (link->network->dhcp || link->network->ipv4ll) { |
| r = link_acquire_conf(link); |
| if (r < 0) { |
| log_warning_link(link, "Could not acquire configuration: %s", strerror(-r)); |
| link_enter_failed(link); |
| return r; |
| } |
| } |
| } else { |
| log_info_link(link, "carrier off"); |
| |
| if (link->network->dhcp) { |
| r = sd_dhcp_client_stop(link->dhcp_client); |
| if (r < 0) { |
| log_warning_link(link, "Could not stop DHCPv4 client: %s", strerror(-r)); |
| link_enter_failed(link); |
| return r; |
| } |
| } |
| |
| if (link->network->ipv4ll) { |
| r = sd_ipv4ll_stop(link->ipv4ll); |
| if (r < 0) { |
| log_warning_link(link, "Could not stop IPv4 link-local: %s", strerror(-r)); |
| link_enter_failed(link); |
| return r; |
| } |
| } |
| } |
| } |
| |
| link->flags = flags; |
| |
| return 0; |
| } |
| |
| static int link_up_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { |
| Link *link = userdata; |
| int r; |
| |
| assert(link); |
| |
| if (link->state == LINK_STATE_FAILED) |
| return 1; |
| |
| r = sd_rtnl_message_get_errno(m); |
| if (r >= 0) |
| link_update_flags(link, link->flags | IFF_UP); |
| else |
| log_struct_link(LOG_WARNING, link, |
| "MESSAGE=%s: could not bring up interface: %s", |
| link->ifname, strerror(-r), |
| "ERRNO=%d", -r, |
| NULL); |
| return 1; |
| } |
| |
| static int link_up(Link *link) { |
| _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL; |
| int r; |
| |
| assert(link); |
| assert(link->manager); |
| assert(link->manager->rtnl); |
| |
| log_debug_link(link, "bringing link up"); |
| |
| r = sd_rtnl_message_new_link(link->manager->rtnl, &req, |
| RTM_SETLINK, link->ifindex); |
| if (r < 0) { |
| log_error_link(link, "Could not allocate RTM_SETLINK message"); |
| return r; |
| } |
| |
| r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP); |
| if (r < 0) { |
| log_error_link(link, "Could not set link flags: %s", strerror(-r)); |
| return r; |
| } |
| |
| r = sd_rtnl_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL); |
| if (r < 0) { |
| log_error_link(link, |
| "Could not send rtnetlink message: %s", strerror(-r)); |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| static int link_enslaved(Link *link) { |
| int r; |
| |
| assert(link); |
| assert(link->state == LINK_STATE_ENSLAVING); |
| assert(link->network); |
| |
| r = link_up(link); |
| if (r < 0) { |
| link_enter_failed(link); |
| return r; |
| } |
| |
| if (!link->network->dhcp && !link->network->ipv4ll) |
| return link_enter_set_addresses(link); |
| |
| return 0; |
| } |
| |
| static int enslave_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { |
| Link *link = userdata; |
| int r; |
| |
| assert(link); |
| assert(link->state == LINK_STATE_ENSLAVING || link->state == LINK_STATE_FAILED); |
| assert(link->network); |
| |
| link->enslaving --; |
| |
| if (link->state == LINK_STATE_FAILED) |
| return 1; |
| |
| r = sd_rtnl_message_get_errno(m); |
| if (r < 0) { |
| log_struct_link(LOG_ERR, link, |
| "MESSAGE=%s: could not enslave: %s", |
| link->ifname, strerror(-r), |
| "ERRNO=%d", -r, |
| NULL); |
| link_enter_failed(link); |
| return 1; |
| } |
| |
| log_debug_link(link, "enslaved"); |
| |
| if (link->enslaving == 0) |
| link_enslaved(link); |
| |
| return 1; |
| } |
| |
| static int link_enter_enslave(Link *link) { |
| NetDev *vlan, *macvlan; |
| Iterator i; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(link->state == _LINK_STATE_INVALID); |
| |
| link->state = LINK_STATE_ENSLAVING; |
| |
| link_save(link); |
| |
| if (!link->network->bridge && !link->network->bond && |
| hashmap_isempty(link->network->vlans) && |
| hashmap_isempty(link->network->macvlans)) |
| return link_enslaved(link); |
| |
| if (link->network->bridge) { |
| log_struct_link(LOG_DEBUG, link, |
| "MESSAGE=%s: enslaving by '%s'", |
| link->ifname, link->network->bridge->name, |
| NETDEV(link->network->bridge), |
| NULL); |
| |
| r = netdev_enslave(link->network->bridge, link, &enslave_handler); |
| if (r < 0) { |
| log_struct_link(LOG_WARNING, link, |
| "MESSAGE=%s: could not enslave by '%s': %s", |
| link->ifname, link->network->bridge->name, strerror(-r), |
| NETDEV(link->network->bridge), |
| NULL); |
| link_enter_failed(link); |
| return r; |
| } |
| |
| link->enslaving ++; |
| } |
| |
| if (link->network->bond) { |
| log_struct_link(LOG_DEBUG, link, |
| "MESSAGE=%s: enslaving by '%s'", |
| link->ifname, link->network->bond->name, |
| NETDEV(link->network->bond), |
| NULL); |
| |
| r = netdev_enslave(link->network->bond, link, &enslave_handler); |
| if (r < 0) { |
| log_struct_link(LOG_WARNING, link, |
| "MESSAGE=%s: could not enslave by '%s': %s", |
| link->ifname, link->network->bond->name, strerror(-r), |
| NETDEV(link->network->bond), |
| NULL); |
| link_enter_failed(link); |
| return r; |
| } |
| |
| link->enslaving ++; |
| } |
| |
| HASHMAP_FOREACH(vlan, link->network->vlans, i) { |
| log_struct_link(LOG_DEBUG, link, |
| "MESSAGE=%s: enslaving by '%s'", |
| link->ifname, vlan->name, NETDEV(vlan), NULL); |
| |
| r = netdev_enslave(vlan, link, &enslave_handler); |
| if (r < 0) { |
| log_struct_link(LOG_WARNING, link, |
| "MESSAGE=%s: could not enslave by '%s': %s", |
| link->ifname, vlan->name, strerror(-r), |
| NETDEV(vlan), NULL); |
| link_enter_failed(link); |
| return r; |
| } |
| |
| link->enslaving ++; |
| } |
| |
| HASHMAP_FOREACH(macvlan, link->network->macvlans, i) { |
| log_struct_link(LOG_DEBUG, link, |
| "MESSAGE=%s: enslaving by '%s'", |
| link->ifname, macvlan->name, NETDEV(macvlan), NULL); |
| |
| r = netdev_enslave(macvlan, link, &enslave_handler); |
| if (r < 0) { |
| log_struct_link(LOG_WARNING, link, |
| "MESSAGE=%s: could not enslave by '%s': %s", |
| link->ifname, macvlan->name, strerror(-r), |
| NETDEV(macvlan), NULL); |
| link_enter_failed(link); |
| return r; |
| } |
| |
| link->enslaving ++; |
| } |
| |
| return 0; |
| } |
| |
| static int link_getlink_handler(sd_rtnl *rtnl, sd_rtnl_message *m, |
| void *userdata) { |
| Link *link = userdata; |
| int r; |
| |
| assert(link); |
| |
| if (link->state == LINK_STATE_FAILED) |
| return 1; |
| |
| r = sd_rtnl_message_get_errno(m); |
| if (r < 0) { |
| log_struct_link(LOG_ERR, link, |
| "MESSAGE=%s: could not get state: %s", |
| link->ifname, strerror(-r), |
| "ERRNO=%d", -r, |
| NULL); |
| link_enter_failed(link); |
| return 1; |
| } |
| |
| link_update(link, m); |
| |
| return 1; |
| } |
| |
| static int link_getlink(Link *link) { |
| _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL; |
| int r; |
| |
| assert(link); |
| assert(link->manager); |
| assert(link->manager->rtnl); |
| |
| log_debug_link(link, "requesting link status"); |
| |
| r = sd_rtnl_message_new_link(link->manager->rtnl, &req, |
| RTM_GETLINK, link->ifindex); |
| if (r < 0) { |
| log_error_link(link, "Could not allocate RTM_GETLINK message"); |
| return r; |
| } |
| |
| r = sd_rtnl_call_async(link->manager->rtnl, req, link_getlink_handler, |
| link, 0, NULL); |
| if (r < 0) { |
| log_error_link(link, |
| "Could not send rtnetlink message: %s", strerror(-r)); |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| static int link_configure(Link *link) { |
| int r; |
| |
| assert(link); |
| assert(link->state == _LINK_STATE_INVALID); |
| |
| r = link_getlink(link); |
| if (r < 0) |
| return r; |
| |
| return link_enter_enslave(link); |
| } |
| |
| int link_add(Manager *m, struct udev_device *device, Link **ret) { |
| Link *link = NULL; |
| Network *network; |
| int r; |
| |
| assert(m); |
| assert(device); |
| |
| r = link_new(m, device, &link); |
| if (r < 0) |
| return r; |
| |
| *ret = link; |
| |
| r = network_get(m, device, &network); |
| if (r < 0) |
| return r == -ENOENT ? 0 : r; |
| |
| r = network_apply(m, network, link); |
| if (r < 0) |
| return r; |
| |
| if (link->network->ipv4ll) { |
| uint8_t seed[8]; |
| r = sd_ipv4ll_new(&link->ipv4ll); |
| if (r < 0) |
| return r; |
| |
| r = net_get_unique_predictable_data(link->udev_device, seed); |
| if (r >= 0) { |
| r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed); |
| if (r < 0) |
| return r; |
| } |
| |
| r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0); |
| if (r < 0) |
| return r; |
| |
| r = sd_ipv4ll_set_index(link->ipv4ll, link->ifindex); |
| if (r < 0) |
| return r; |
| |
| r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link); |
| if (r < 0) |
| return r; |
| } |
| |
| if (link->network->dhcp) { |
| r = sd_dhcp_client_new(&link->dhcp_client); |
| if (r < 0) |
| return r; |
| |
| r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0); |
| if (r < 0) |
| return r; |
| |
| r = sd_dhcp_client_set_index(link->dhcp_client, link->ifindex); |
| if (r < 0) |
| return r; |
| |
| r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp_handler, link); |
| if (r < 0) |
| return r; |
| |
| if (link->network->dhcp_mtu) { |
| r = sd_dhcp_client_set_request_option(link->dhcp_client, 26); |
| if (r < 0) |
| return r; |
| } |
| } |
| |
| r = link_configure(link); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int link_update(Link *link, sd_rtnl_message *m) { |
| unsigned flags; |
| struct ether_addr mac; |
| int r; |
| |
| assert(link); |
| assert(link->network); |
| assert(m); |
| |
| if (link->state == LINK_STATE_FAILED) |
| return 0; |
| |
| if (link->network->dhcp && link->network->dhcp_mtu && |
| !link->original_mtu) { |
| r = sd_rtnl_message_read_u16(m, IFLA_MTU, &link->original_mtu); |
| if (r >= 0) |
| log_debug_link(link, "saved original MTU: %" |
| PRIu16, link->original_mtu); |
| } |
| |
| r = sd_rtnl_message_read_ether_addr(m, IFLA_ADDRESS, &mac); |
| if (r >= 0 && memcmp(&link->mac.ether_addr_octet, &mac.ether_addr_octet, ETH_ALEN)) { |
| |
| memcpy(&link->mac.ether_addr_octet, &mac.ether_addr_octet, ETH_ALEN); |
| |
| log_debug_link(link, "MAC address: " |
| "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx", |
| mac.ether_addr_octet[0], |
| mac.ether_addr_octet[1], |
| mac.ether_addr_octet[2], |
| mac.ether_addr_octet[3], |
| mac.ether_addr_octet[4], |
| mac.ether_addr_octet[5]); |
| |
| if (link->ipv4ll) { |
| r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac); |
| if (r < 0) { |
| log_warning_link(link, "Could not update MAC " |
| "address in IPv4LL client: %s", |
| strerror(-r)); |
| return r; |
| } |
| } |
| |
| if (link->dhcp_client) { |
| r = sd_dhcp_client_set_mac(link->dhcp_client, &link->mac); |
| if (r < 0) { |
| log_warning_link(link, "Could not update MAC " |
| "address in DHCP client: %s", |
| strerror(-r)); |
| return r; |
| } |
| } |
| } |
| |
| r = sd_rtnl_message_link_get_flags(m, &flags); |
| if (r < 0) { |
| log_warning_link(link, "Could not get link flags"); |
| return r; |
| } |
| |
| return link_update_flags(link, flags); |
| } |
| |
| int link_save(Link *link) { |
| _cleanup_free_ char *temp_path = NULL; |
| _cleanup_fclose_ FILE *f = NULL; |
| int r; |
| |
| assert(link); |
| assert(link->state_file); |
| |
| r = fopen_temporary(link->state_file, &f, &temp_path); |
| if (r < 0) |
| goto finish; |
| |
| fchmod(fileno(f), 0644); |
| |
| fprintf(f, |
| "# This is private data. Do not parse.\n" |
| "STATE=%s\n", |
| link_state_to_string(link->state)); |
| |
| if (link->dhcp_lease) { |
| char *lease_file; |
| |
| r = asprintf(&lease_file, "/run/systemd/network/leases/%"PRIu64, |
| link->ifindex); |
| if (r < 0) |
| return -ENOMEM; |
| |
| r = dhcp_lease_save(link->dhcp_lease, lease_file); |
| if (r < 0) |
| goto finish; |
| |
| fprintf(f, "DHCP_LEASE=%s\n", lease_file); |
| } |
| |
| fflush(f); |
| |
| if (ferror(f) || rename(temp_path, link->state_file) < 0) { |
| r = -errno; |
| unlink(link->state_file); |
| unlink(temp_path); |
| } |
| |
| finish: |
| if (r < 0) |
| log_error("Failed to save link data %s: %s", link->state_file, strerror(-r)); |
| |
| return r; |
| } |
| |
| static const char* const link_state_table[_LINK_STATE_MAX] = { |
| [LINK_STATE_ENSLAVING] = "configuring", |
| [LINK_STATE_SETTING_ADDRESSES] = "configuring", |
| [LINK_STATE_SETTING_ROUTES] = "configuring", |
| [LINK_STATE_CONFIGURED] = "configured", |
| [LINK_STATE_FAILED] = "failed", |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState); |