X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fnetwork%2Fnetworkd-link.c;h=927dbb196001bae83286b677439fab5b0231967e;hp=c03472216c50de8d3a31e0463173470100105e80;hb=e9189a1f56e5dd418d13dfcf3a7f5a701884858e;hpb=602cc437e8b4a3ab760b5a23fa4f3112134d9c36 diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c index c03472216..927dbb196 100644 --- a/src/network/networkd-link.c +++ b/src/network/networkd-link.c @@ -25,13 +25,21 @@ #include "networkd.h" #include "libudev-private.h" #include "util.h" +#include "bus-util.h" +#include "network-internal.h" + +#include "dhcp-lease-internal.h" + +static int ipv4ll_address_update(Link *link, bool deprecate); +static bool ipv4ll_is_bound(sd_ipv4ll *ll); int link_new(Manager *manager, struct udev_device *device, Link **ret) { _cleanup_link_free_ Link *link = NULL; - const char *mac; - struct ether_addr *mac_addr; + const char *ifname; int r; + assert(manager); + assert(manager->links); assert(device); assert(ret); @@ -39,27 +47,27 @@ int link_new(Manager *manager, struct udev_device *device, Link **ret) { 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; - mac = udev_device_get_sysattr_value(device, "address"); - if (!mac) - return -EINVAL; - - mac_addr = ether_aton(mac); - if (!mac_addr) - return -EINVAL; - - memcpy(&link->mac, mac_addr, sizeof(struct ether_addr)); + r = asprintf(&link->state_file, "/run/systemd/network/links/%"PRIu64, + link->ifindex); + if (r < 0) + return -ENOMEM; - link->manager = manager; - link->state = _LINK_STATE_INVALID; + 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; @@ -72,230 +80,1522 @@ void link_free(Link *link) { assert(link->manager); + sd_dhcp_client_unref(link->dhcp_client); + sd_dhcp_lease_unref(link->dhcp_lease); + + sd_ipv4ll_unref(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_add(Manager *m, struct udev_device *device) { +int link_get(Manager *m, int ifindex, Link **ret) { Link *link; - Network *network; - int r; - uint64_t ifindex; + uint64_t ifindex_64; assert(m); - assert(device); - - ifindex = udev_device_get_ifindex(device); - link = hashmap_get(m->links, &ifindex); - if (link) - return 0; - - r = link_new(m, device, &link); - if (r < 0) { - log_error("could not create link: %s", strerror(-r)); - return r; - } + assert(m->links); + assert(ifindex); + assert(ret); - r = network_get(m, device, &network); - if (r < 0) - return r == -ENOENT ? 0 : r; + ifindex_64 = ifindex; + link = hashmap_get(m->links, &ifindex_64); + if (!link) + return -ENODEV; - r = network_apply(m, network, link); - if (r < 0) - return r; + *ret = link; return 0; } static int link_enter_configured(Link *link) { - log_info("Link configured successfully."); - - link->state = LINK_STATE_CONFIGURED; + assert(link); + assert(link->state == LINK_STATE_SETTING_ROUTES); - return 0; -} + log_info_link(link, "link configured"); -static int link_enter_failed(Link *link) { - log_warning("Could not configure link."); + link->state = LINK_STATE_CONFIGURED; - link->state = LINK_STATE_FAILED; + link_save(link); return 0; } -static bool link_is_up(Link *link) { - return link->flags & IFF_UP; -} - -static int link_enter_routes_set(Link *link) { - log_info("Routes set for link %u", (unsigned)link->ifindex); +static void link_enter_failed(Link *link) { + assert(link); - if (link_is_up(link)) - return link_enter_configured(link); + log_warning_link(link, "failed"); - link->state = LINK_STATE_ROUTES_SET; + link->state = LINK_STATE_FAILED; - return 0; + link_save(link); } static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { Link *link = userdata; int r; - assert(link->rtnl_messages > 0); - assert(link->state == LINK_STATE_SET_ROUTES || link->state == LINK_STATE_FAILED); + assert(link->route_messages > 0); + assert(link->state == LINK_STATE_SETTING_ADDRESSES || + link->state == LINK_STATE_SETTING_ROUTES || + link->state == LINK_STATE_FAILED); - link->rtnl_messages --; + link->route_messages --; if (link->state == LINK_STATE_FAILED) return 1; r = sd_rtnl_message_get_errno(m); - if (r < 0 && r != -EEXIST) { - log_warning("Could not set route on interface %u: %s", - (unsigned)link->ifindex, strerror(-r)); - return link_enter_failed(link); + 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); } - if (link->rtnl_messages == 0) - return link_enter_routes_set(link); - return 1; } static int link_enter_set_routes(Link *link) { - Route *route; + Route *rt; int r; assert(link); assert(link->network); - assert(link->rtnl_messages == 0); - assert(link->state == LINK_STATE_ADDRESSES_SET); + assert(link->state == LINK_STATE_SETTING_ADDRESSES); + + link->state = LINK_STATE_SETTING_ROUTES; + + if (!link->network->static_routes && !link->dhcp_lease && + (!link->ipv4ll || ipv4ll_is_bound(link->ipv4ll) == false)) + 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 ++; + } - link->state = LINK_STATE_SET_ROUTES; + 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->network->routes) - return link_enter_routes_set(link); + 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; - LIST_FOREACH(routes, route, link->network->routes) { r = route_configure(route, link, &route_handler); - if (r < 0) + 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 link_enter_addresses_set(Link *link) { - log_info("Addresses set for link %u", (unsigned)link->ifindex); +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; - link->state = LINK_STATE_ADDRESSES_SET; + 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 link_enter_set_routes(link); + return 0; } static int address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { Link *link = userdata; int r; - assert(link->rtnl_messages > 0); - assert(link->state == LINK_STATE_SET_ADDRESSES || link->state == LINK_STATE_FAILED); + 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->rtnl_messages --; + link->addr_messages --; if (link->state == LINK_STATE_FAILED) return 1; r = sd_rtnl_message_get_errno(m); - if (r < 0 && r != -EEXIST) { - log_warning("Could not set address on interface %u: %s", - (unsigned)link->ifindex, strerror(-r)); - link_enter_failed(link); + 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); } - if (link->rtnl_messages == 0) - link_enter_addresses_set(link); - return 1; } static int link_enter_set_addresses(Link *link) { - Address *address; + Address *ad; int r; assert(link); assert(link->network); - assert(link->rtnl_messages == 0); + assert(link->state != _LINK_STATE_INVALID); + + link->state = LINK_STATE_SETTING_ADDRESSES; + + if (!link->network->static_addresses && !link->dhcp_lease && + (!link->ipv4ll || ipv4ll_is_bound(link->ipv4ll) == false)) + 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->network->addresses) - return link_enter_addresses_set(link); + 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 ++; + } + } - link->state = LINK_STATE_SET_ADDRESSES; + 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; - LIST_FOREACH(addresses, address, link->network->addresses) { r = address_configure(address, link, &address_handler); - if (r < 0) + 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 link_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { +static int address_update_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_warning("Could not bring up interface %u: %s", - (unsigned)link->ifindex, strerror(-r)); - return link_enter_failed(link); + if (r < 0 && r != -ENOENT) + log_struct_link(LOG_WARNING, link, + "MESSAGE=%s: could not update address: %s", + link->ifname, strerror(-r), + "ERRNO=%d", -r, + NULL); + + 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; } - link->flags |= IFF_UP; + r = sd_bus_message_new_method_call( + bus, + &m, + "org.freedesktop.hostname1", + "/org/freedesktop/hostname1", + "org.freedesktop.hostname1", + "SetHostname"); + if (r < 0) + return r; - log_info("Link is UP."); + r = sd_bus_message_append(m, "sb", hostname, false); + if (r < 0) + return r; - if (link->state == LINK_STATE_ROUTES_SET) - return link_enter_configured(link); + 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_up(Link *link) { - _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL; +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); - r = sd_rtnl_message_link_new(RTM_NEWLINK, link->ifindex, 0, IFF_UP, &req); + 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("Could not allocate RTM_NEWLINK message"); + log_error_link(link, "Could not allocate RTM_SETLINK message"); return r; } - r = sd_rtnl_call_async(link->manager->rtnl, req, link_handler, link, 0, NULL); + r = sd_rtnl_message_append_u32(req, IFLA_MTU, mtu); if (r < 0) { - log_error("Could not send rtnetlink message: %s", strerror(-r)); + 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; } -int link_configure(Link *link) { +static int dhcp_lease_lost(Link *link) { + _cleanup_address_free_ Address *address = NULL; + _cleanup_route_free_ Route *route_gw = NULL; + _cleanup_route_free_ Route *route = NULL; + struct in_addr addr; + struct in_addr netmask; + struct in_addr gateway; + unsigned prefixlen; int r; - r = link_up(link); - if (r < 0) - return link_enter_failed(link); + assert(link); + assert(link->dhcp_lease); - r = link_enter_set_addresses(link); - if (r < 0) - return link_enter_failed(link); + 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); + sd_dhcp_lease_get_router(link->dhcp_lease, &gateway); + prefixlen = net_netmask_to_prefixlen(&netmask); + + r = route_new_dynamic(&route_gw); + if (r >= 0) { + route_gw->family = AF_INET; + route_gw->dst_addr.in = gateway; + route_gw->dst_prefixlen = 32; + route_gw->scope = RT_SCOPE_LINK; + + route_drop(route_gw, link, &route_drop_handler); + } + + r = route_new_dynamic(&route); + if (r >= 0) { + route->family = AF_INET; + route->in_addr.in = gateway; + + route_drop(route, link, &route_drop_handler); + } + + 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 = 0; + + 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) { + if (!sd_ipv4ll_is_running(link->ipv4ll)) + r = sd_ipv4ll_start(link->ipv4ll); + else if (ipv4ll_is_bound(link->ipv4ll)) + r = ipv4ll_address_update(link, false); + 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) { + if (ipv4ll_is_bound(link->ipv4ll)) + r = ipv4ll_address_update(link, true); + else + 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_update(Link *link, bool deprecate) { + int r; + struct in_addr addr; + + assert(link); + + r = sd_ipv4ll_get_address(link->ipv4ll, &addr); + if (r >= 0) { + _cleanup_address_free_ Address *address = NULL; + + log_debug_link(link, "IPv4 link-local %s %u.%u.%u.%u", + deprecate ? "deprecate" : "approve", + 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->cinfo.ifa_prefered = deprecate ? 0 : CACHE_INFO_INFINITY_LIFE_TIME; + address->broadcast.s_addr = address->in_addr.in.s_addr | htonl(0xfffffffflu >> address->prefixlen); + + address_update(address, link, &address_update_handler); + } + + return 0; + +} + +static int ipv4ll_address_lost(Link *link) { + int r; + struct in_addr addr; + + 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 bool ipv4ll_is_bound(sd_ipv4ll *ll) { + int r; + struct in_addr addr; + + assert(ll); + + r = sd_ipv4ll_get_address(ll, &addr); + if (r < 0) + return false; + return true; +} + +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(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) { + unsigned flags_added, flags_removed, generic_flags; + bool carrier_gained, carrier_lost; + int r; + + assert(link); + assert(link->network); + + if (link->state == LINK_STATE_FAILED) + return 0; + + if (link->flags == flags) + return 0; + + flags_added = (link->flags ^ flags) & flags; + flags_removed = (link->flags ^ flags) & link->flags; + generic_flags = ~(IFF_UP | IFF_LOWER_UP | IFF_RUNNING); + + /* consider link to have carrier when both RUNNING and LOWER_UP, as RUNNING + may mean that the oper state is unknown, in which case we should fall back to + simply trust LOWER_UP, even thought that is less reliable + */ + carrier_gained = ((flags_added & IFF_LOWER_UP) && (flags & IFF_RUNNING)) || + ((flags_added & IFF_RUNNING) && (flags & IFF_LOWER_UP)); + carrier_lost = ((link->flags & (IFF_RUNNING | IFF_LOWER_UP)) == + (IFF_RUNNING | IFF_LOWER_UP)) && + (flags_removed & (IFF_LOWER_UP | IFF_RUNNING)); + + link->flags = flags; + + if (flags_added & generic_flags) + log_debug_link(link, "link flags gained: %#.8x", + flags_added & generic_flags); + + if (flags_removed & generic_flags) + log_debug_link(link, "link flags lost: %#.8x", + flags_removed & generic_flags); + + if (flags_added & IFF_UP) + log_info_link(link, "link is up"); + else if (flags_removed & IFF_UP) + log_info_link(link, "link is down"); + + if (flags_added & IFF_LOWER_UP) + log_info_link(link, "link is lower up"); + else if (flags_removed & IFF_LOWER_UP) + log_info_link(link, "link is lower down"); + + if (flags_added & IFF_RUNNING) + log_info_link(link, "link is running"); + else if (flags_removed & IFF_RUNNING) + log_info_link(link, "link is not running"); + + if (carrier_gained) { + log_info_link(link, "gained carrier"); + + 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 if (carrier_lost) { + log_info_link(link, "lost carrier"); + + 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; + } + } + } + + 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); + 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_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); + } + + /* The kernel may broadcast NEWLINK messages without the MAC address + set, simply ignore them. */ + r = sd_rtnl_message_read_ether_addr(m, IFLA_ADDRESS, &mac); + if (r >= 0) { + if (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; + const char *state; + int r; + + assert(link); + assert(link->state_file); + + state = link_state_to_string(link->state); + assert(state); + + 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", state); + + if (link->dhcp_lease) { + _cleanup_free_ char *lease_file = NULL; + + 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);