X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fnetwork%2Fnetworkd-link.c;h=4044f0b5a52e65dfd6e0febd4957b809c80dd797;hb=a2ba62c719224a4b47751623ca5e8b0333f49721;hp=4cf34a6d94848680ec58c7a8d49d5bf95c6431f5;hpb=b0d27a25089e3aa7d9222497005a1d9fff71e59d;p=elogind.git diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c index 4cf34a6d9..94683a540 100644 --- a/src/network/networkd-link.c +++ b/src/network/networkd-link.c @@ -21,41 +21,76 @@ #include #include +#include #include "networkd.h" +#include "networkd-netdev.h" #include "libudev-private.h" +#include "udev-util.h" #include "util.h" +#include "virt.h" +#include "bus-util.h" +#include "network-internal.h" +#include "conf-parser.h" + +#include "network-util.h" +#include "dhcp-lease-internal.h" + +static int ipv4ll_address_update(Link *link, bool deprecate); +static bool ipv4ll_is_bound(sd_ipv4ll *ll); + +static int link_new(Manager *manager, sd_rtnl_message *message, Link **ret) { + _cleanup_link_unref_ Link *link = NULL; + uint16_t type; + char *ifname; + int r, ifindex; + + assert(manager); + assert(manager->links); + assert(message); + assert(ret); -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; + r = sd_rtnl_message_get_type(message, &type); + if (r < 0) + return r; + else if (type != RTM_NEWLINK) + return -EINVAL; - assert(device); - assert(ret); + r = sd_rtnl_message_link_get_ifindex(message, &ifindex); + if (r < 0) + return r; + else if (ifindex <= 0) + return -EINVAL; + + r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &ifname); + if (r < 0) + return r; link = new0(Link, 1); if (!link) return -ENOMEM; + link->n_ref = 1; link->manager = manager; - link->state = _LINK_STATE_INVALID; + link->state = LINK_STATE_INITIALIZING; + link->ifindex = ifindex; + link->ifname = strdup(ifname); + if (!link->ifname) + return -ENOMEM; - link->ifindex = udev_device_get_ifindex(device); - if (link->ifindex <= 0) - return -EINVAL; + r = sd_rtnl_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac); + if (r < 0) + log_debug_link(link, "MAC address not found for new device, continuing without"); - mac = udev_device_get_sysattr_value(device, "address"); - if (mac) { - mac_addr = ether_aton(mac); - if (mac_addr) - memcpy(&link->mac, mac_addr, sizeof(struct ether_addr)); - } + r = asprintf(&link->state_file, "/run/systemd/netif/links/%"PRIu64, + link->ifindex); + if (r < 0) + return -ENOMEM; - ifname = udev_device_get_sysname(device); - link->ifname = strdup(ifname); + r = asprintf(&link->lease_file, "/run/systemd/netif/leases/%"PRIu64, + link->ifindex); + if (r < 0) + return -ENOMEM; r = hashmap_put(manager->links, &link->ifindex, link); if (r < 0) @@ -67,344 +102,2522 @@ int link_new(Manager *manager, struct udev_device *device, Link **ret) { return 0; } -void link_free(Link *link) { +static void link_free(Link *link) { + Address *address; + if (!link) return; - assert(link->manager); + while ((address = link->addresses)) { + LIST_REMOVE(addresses, link->addresses, address); + address_free(address); + } + + while ((address = link->pool_addresses)) { + LIST_REMOVE(addresses, link->pool_addresses, address); + address_free(address); + } + + sd_dhcp_client_unref(link->dhcp_client); + sd_dhcp_lease_unref(link->dhcp_lease); + + unlink(link->lease_file); + free(link->lease_file); + + sd_ipv4ll_unref(link->ipv4ll); + sd_dhcp6_client_unref(link->dhcp6_client); + sd_icmp6_nd_unref(link->icmp6_router_discovery); - hashmap_remove(link->manager->links, &link->ifindex); + if (link->manager) + hashmap_remove(link->manager->links, &link->ifindex); free(link->ifname); + unlink(link->state_file); + free(link->state_file); + + udev_device_unref(link->udev_device); + free(link); } -int link_add(Manager *m, struct udev_device *device) { +Link *link_unref(Link *link) { + if (link && (-- link->n_ref <= 0)) + link_free(link); + + return NULL; +} + +Link *link_ref(Link *link) { + if (link) + assert_se(++ link->n_ref >= 2); + + return link; +} + +int link_get(Manager *m, int ifindex, Link **ret) { Link *link; - Network *network; - int r; - uint64_t ifindex; - const char *devtype; + uint64_t ifindex_64; assert(m); - assert(device); + assert(m->links); + assert(ifindex); + assert(ret); - ifindex = udev_device_get_ifindex(device); - link = hashmap_get(m->links, &ifindex); - if (link) + ifindex_64 = ifindex; + link = hashmap_get(m->links, &ifindex_64); + if (!link) + return -ENODEV; + + *ret = link; + + return 0; +} + +void link_drop(Link *link) { + if (!link || link->state == LINK_STATE_LINGER) + return; + + link->state = LINK_STATE_LINGER; + + log_debug_link(link, "link removed"); + + link_unref(link); + + return; +} + +static void link_enter_unmanaged(Link *link) { + assert(link); + + log_debug_link(link, "unmanaged"); + + link->state = LINK_STATE_UNMANAGED; + + link_save(link); +} + +static int link_stop_clients(Link *link) { + int r = 0, k; + + assert(link); + assert(link->manager); + assert(link->manager->event); + + if (!link->network) return 0; - r = link_new(m, device, &link); - if (r < 0) { - log_error("Could not create link: %s", strerror(-r)); - return r; + if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V6)) { + assert(link->dhcp_client); + + k = sd_dhcp_client_stop(link->dhcp_client); + if (k < 0) { + log_warning_link(link, "Could not stop DHCPv4 client: %s", strerror(-r)); + r = k; + } } - devtype = udev_device_get_devtype(device); - if (streq_ptr(devtype, "bridge")) { - r = bridge_set_link(m, link); - if (r < 0) - return r == -ENOENT ? 0 : r; + if (link->network->ipv4ll) { + assert(link->ipv4ll); + + k = sd_ipv4ll_stop(link->ipv4ll); + if (k < 0) { + log_warning_link(link, "Could not stop IPv4 link-local: %s", strerror(-r)); + r = k; + } } - r = network_get(m, device, &network); - if (r < 0) - return r == -ENOENT ? 0 : r; + if (link->network->dhcp_server) { + assert(link->dhcp_server); - r = network_apply(m, network, link); - if (r < 0) - return r; + k = sd_dhcp_server_stop(link->dhcp_server); + if (k < 0) { + log_warning_link(link, "Could not stop DHCPv4 server: %s", strerror(-r)); + r = k; + } + } - return 0; -} + if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V6)) { + assert(link->icmp6_router_discovery); -static int link_enter_configured(Link *link) { - log_info("Link '%s' configured", link->ifname); + if (link->dhcp6_client) { + k = sd_dhcp6_client_stop(link->dhcp6_client); + if (k < 0) { + log_warning_link(link, "Could not stop DHCPv6 client: %s", strerror(-r)); + r = k; + } + } - link->state = LINK_STATE_CONFIGURED; + k = sd_icmp6_nd_stop(link->icmp6_router_discovery); + if (k < 0) { + log_warning_link(link, "Could not stop ICMPv6 router discovery: %s", strerror(-r)); + r = k; + } + } - return 0; + return r; } -static int link_enter_failed(Link *link) { +static void link_enter_failed(Link *link) { + assert(link); + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return; + + log_warning_link(link, "failed"); + link->state = LINK_STATE_FAILED; - return 0; + link_stop_clients(link); + + link_save(link); } -static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { - Link *link = userdata; - int r; +static Address* link_find_dhcp_server_address(Link *link) { + Address *address; - assert(link->rtnl_messages > 0); - assert(link->state == LINK_STATE_SET_ROUTES || link->state == LINK_STATE_FAILED); + assert(link); + assert(link->network); - link->rtnl_messages --; + /* The the first statically configured address if there is any */ + LIST_FOREACH(addresses, address, link->network->static_addresses) { - if (link->state == LINK_STATE_FAILED) - return 1; + if (address->family != AF_INET) + continue; - r = sd_rtnl_message_get_errno(m); - if (r < 0 && r != -EEXIST) - log_warning("Could not set route on interface '%s': %s", - link->ifname, strerror(-r)); + if (in_addr_null(address->family, &address->in_addr)) + continue; - if (link->rtnl_messages == 0) { - log_info("Routes set for link '%s'", link->ifname); - link_enter_configured(link); + return address; } - return 1; + /* If that didn't work, find a suitable address we got from the pool */ + LIST_FOREACH(addresses, address, link->pool_addresses) { + if (address->family != AF_INET) + continue; + + return address; + } + + return NULL; } -static int link_enter_set_routes(Link *link) { - Route *route; +static int link_enter_configured(Link *link) { 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_ROUTES); + + if (link->network->dhcp_server && + !sd_dhcp_server_is_running(link->dhcp_server)) { + struct in_addr pool_start; + Address *address; + + address = link_find_dhcp_server_address(link); + if (!address) { + log_warning_link(link, "Failed to find suitable address for DHCPv4 server instance."); + link_enter_failed(link); + return 0; + } - link->state = LINK_STATE_SET_ROUTES; + log_debug_link(link, "offering DHCPv4 leases"); - if (!link->network->routes) - return link_enter_configured(link); + r = sd_dhcp_server_set_address(link->dhcp_server, &address->in_addr.in); + if (r < 0) + return r; - LIST_FOREACH(routes, route, link->network->routes) { - r = route_configure(route, link, &route_handler); + /* offer 32 addresses starting from the address following the server address */ + pool_start.s_addr = htobe32(be32toh(address->in_addr.in.s_addr) + 1); + r = sd_dhcp_server_set_lease_pool(link->dhcp_server, + &pool_start, 32); + if (r < 0) + return r; + + /* TODO: + r = sd_dhcp_server_set_router(link->dhcp_server, + &main_address->in_addr.in); + if (r < 0) + return r; + + r = sd_dhcp_server_set_prefixlen(link->dhcp_server, + main_address->prefixlen); + if (r < 0) + return r; + */ + + r = sd_dhcp_server_start(link->dhcp_server); if (r < 0) { - log_warning("Could not set routes for link '%s'", link->ifname); - return link_enter_failed(link); - } + log_warning_link(link, "could not start DHCPv4 server " + "instance: %s", strerror(-r)); - link->rtnl_messages ++; + link_enter_failed(link); + + return 0; + } } - return 0; -} + log_info_link(link, "link configured"); -static int link_enter_addresses_set(Link *link) { - link->state = LINK_STATE_ADDRESSES_SET; + link->state = LINK_STATE_CONFIGURED; + + link_save(link); - return link_enter_set_routes(link); + return 0; } -static int address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { - Link *link = userdata; +static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; int r; - assert(link->rtnl_messages > 0); - assert(link->state == LINK_STATE_SET_ADDRESSES || link->state == LINK_STATE_FAILED); + assert(link->route_messages > 0); + assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES, + LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED, + LINK_STATE_LINGER)); - link->rtnl_messages --; + link->route_messages --; - if (link->state == LINK_STATE_FAILED) + if (IN_SET(LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_rtnl_message_get_errno(m); if (r < 0 && r != -EEXIST) - log_warning("Could not set address on interface '%s': %s", - link->ifname, strerror(-r)); - - if (link->rtnl_messages == 0) { - log_info("Addresses set for link '%s'", link->ifname); - link_enter_addresses_set(link); + log_struct_link(LOG_WARNING, link, + "MESSAGE=%-*s: could not set route: %s", + IFNAMSIZ, + 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_addresses(Link *link) { - Address *address; - int r; +static int link_set_dhcp_routes(Link *link) { + struct sd_dhcp_route *static_routes; + int r, n, i; assert(link); - assert(link->network); - assert(link->rtnl_messages == 0); - if (!link->network->addresses) - return link_enter_addresses_set(link); + n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes); + if (n < 0) { + if (n != -ENOENT) + log_warning_link(link, "DHCP error: could not get routes: %s", strerror(-n)); + return n; + } + + for (i = 0; i < n; i++) { + _cleanup_route_free_ Route *route = NULL; + + r = route_new_dynamic(&route); + if (r < 0) { + log_error_link(link, "Could not allocate route: %s", + strerror(-r)); + return r; + } - link->state = LINK_STATE_SET_ADDRESSES; + route->family = AF_INET; + route->in_addr.in = static_routes[i].gw_addr; + route->dst_addr.in = static_routes[i].dst_addr; + route->dst_prefixlen = static_routes[i].dst_prefixlen; + route->metrics = DHCP_ROUTE_METRIC; - LIST_FOREACH(addresses, address, link->network->addresses) { - r = address_configure(address, link, &address_handler); + r = route_configure(route, link, &route_handler); if (r < 0) { - log_warning("Could not set addresses for link '%s'", link->ifname); - return link_enter_failed(link); + log_warning_link(link, + "could not set host route: %s", strerror(-r)); + return r; } - link->rtnl_messages ++; + link->route_messages ++; } return 0; } -static int link_get_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { - Link *link = userdata; +static int link_enter_set_routes(Link *link) { + Route *rt; int r; - r = sd_rtnl_message_get_errno(m); - if (r < 0) { - log_warning("Could not get state of interface '%s': %s", - link->ifname, strerror(-r)); - link_enter_failed(link); + 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 || ipv4ll_is_bound(link->ipv4ll) == false)) + return link_enter_configured(link); + + log_debug_link(link, "setting routes"); + + LIST_FOREACH(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 ++; } - return 1; -} + if (link->ipv4ll && !link->dhcp_lease) { + _cleanup_route_free_ Route *route = NULL; + struct in_addr addr; -static int link_get(Link *link) { - _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL; - int r; + 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; + } - assert(link); - assert(link->manager); - assert(link->manager->rtnl); + 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 = IPV4LL_ROUTE_METRIC; + + 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 ++; + } + } - r = sd_rtnl_message_link_new(RTM_GETLINK, link->ifindex, &req); - if (r < 0) { - log_error("Could not allocate RTM_GETLINK message"); - return r; + 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 && r != -ENOENT) { + log_warning_link(link, "DHCP error: could not get gateway: %s", + strerror(-r)); + return r; + } + + if (r >= 0) { + 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; + route_gw->metrics = DHCP_ROUTE_METRIC; + + 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; + route->metrics = DHCP_ROUTE_METRIC; + + 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->dhcp_routes) + link_set_dhcp_routes(link); } - r = sd_rtnl_call_async(link->manager->rtnl, req, link_get_handler, link, 0, NULL); - if (r < 0) { - log_error("Could not send rtnetlink message: %s", strerror(-r)); - return r; + if (link->route_messages == 0) { + link_enter_configured(link); } return 0; } -static int link_up_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { - Link *link = userdata; +static int route_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; int r; + assert(m); + assert(link); + assert(link->ifname); + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return 1; + r = sd_rtnl_message_get_errno(m); - if (r < 0) { - log_warning("Could not bring up interface '%s': %s", - link->ifname, strerror(-r)); - link_enter_failed(link); - } + if (r < 0 && r != -ESRCH) + log_struct_link(LOG_WARNING, link, + "MESSAGE=%-*s: could not drop route: %s", + IFNAMSIZ, + 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_get_address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; int r; + assert(rtnl); + assert(m); assert(link); assert(link->manager); - assert(link->manager->rtnl); - - r = sd_rtnl_message_link_new(RTM_SETLINK, link->ifindex, &req); - if (r < 0) { - log_error("Could not allocate RTM_SETLINK message"); - return r; - } - r = sd_rtnl_message_link_set_flags(req, IFF_UP); - if (r < 0) { - log_error("Could not set link flags"); - return r; - } + for (; m; m = sd_rtnl_message_next(m)) { + r = sd_rtnl_message_get_errno(m); + if (r < 0) { + log_debug_link(link, "getting address failed: %s", strerror(-r)); + continue; + } - r = sd_rtnl_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL); - if (r < 0) { - log_error("Could not send rtnetlink message: %s", strerror(-r)); - return r; + r = link_rtnl_process_address(rtnl, m, link->manager); + if (r < 0) + log_warning_link(link, "could not process address: %s", strerror(-r)); } - return 0; + return 1; } -static int link_enter_bridge_joined(Link *link) { +static int address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; int r; - link->state = LINK_STATE_BRIDGE_JOINED; - - r = link_up(link); - if (r < 0) - return link_enter_failed(link); - - return link_enter_set_addresses(link); -} - -static int bridge_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { - Link *link = userdata; - int r; + assert(rtnl); + assert(m); + assert(link); + assert(link->ifname); + assert(link->addr_messages > 0); + assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES, + LINK_STATE_FAILED, LINK_STATE_LINGER)); - assert(link->state == LINK_STATE_JOIN_BRIDGE || link->state == LINK_STATE_FAILED); + link->addr_messages --; - if (link->state == LINK_STATE_FAILED) + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return 1; r = sd_rtnl_message_get_errno(m); - if (r < 0) - log_warning("Could not join interface '%s' to bridge '%s': %s", - link->ifname, link->network->bridge->name, strerror(-r)); - else - log_info("Join interface '%s' to bridge: %s", - link->ifname, link->network->bridge->name); + if (r < 0 && r != -EEXIST) + log_struct_link(LOG_WARNING, link, + "MESSAGE=%-*s: could not set address: %s", + IFNAMSIZ, + link->ifname, strerror(-r), + "ERRNO=%d", -r, + NULL); + else if (r >= 0) { + /* calling handler directly so take a ref */ + link_ref(link); + link_get_address_handler(rtnl, m, link); + } - link_enter_bridge_joined(link); + if (link->addr_messages == 0) { + log_debug_link(link, "addresses set"); + link_enter_set_routes(link); + } return 1; } -static int link_enter_join_bridge(Link *link) { +static int link_enter_set_addresses(Link *link) { + Address *ad; int r; + uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME; assert(link); assert(link->network); + assert(link->state != _LINK_STATE_INVALID); - if (!link->network->bridge) - return link_enter_bridge_joined(link); + link->state = LINK_STATE_SETTING_ADDRESSES; - link->state = LINK_STATE_JOIN_BRIDGE; + if (!link->network->static_addresses && !link->dhcp_lease && + (!link->ipv4ll || ipv4ll_is_bound(link->ipv4ll) == false)) + return link_enter_set_routes(link); - r = bridge_join(link->network->bridge, link, &bridge_handler); - if (r < 0) { - log_warning("Could not join link '%s' to bridge '%s'", link->ifname, - link->network->bridge->name); - return link_enter_failed(link); + log_debug_link(link, "setting addresses"); + + LIST_FOREACH(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 ++; } - return 0; -} + if (link->ipv4ll && !link->dhcp_lease) { + _cleanup_address_free_ Address *ll_addr = NULL; + struct in_addr addr; -int link_configure(Link *link) { - int r; + 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; + } - r = link_get(link); - if (r < 0) - return link_enter_failed(link); + 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 ++; + } + } - r = link_enter_join_bridge(link); - if (r < 0) - return link_enter_failed(link); + if (link->dhcp_lease) { + _cleanup_address_free_ Address *address = NULL; + struct in_addr addr; + struct in_addr netmask; + unsigned prefixlen; - return 0; -} + 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; + } -int link_update_flags(Link *link, unsigned flags) { - assert(link); + if (!link->network->dhcp_critical) { + r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, + &lifetime); + if (r < 0) { + log_warning_link(link, "DHCP error: no lifetime: %s", + strerror(-r)); + return r; + } + } - if (link->flags & IFF_UP && !(flags & IFF_UP)) - log_info("Interface '%s' is down", link->ifname); - else if (!(link->flags & IFF_UP) && flags & IFF_UP) - log_info("Interface '%s' is up", link->ifname); + 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; + } - if (link->flags & IFF_LOWER_UP && !(flags & IFF_LOWER_UP)) - log_info("Interface '%s' is disconnected", link->ifname); - else if (!(link->flags & IFF_LOWER_UP) && flags & IFF_LOWER_UP) - log_info("Interface '%s' is connected", link->ifname); + prefixlen = net_netmask_to_prefixlen(&netmask); - link->flags = flags; + 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->cinfo.ifa_prefered = lifetime; + address->cinfo.ifa_valid = lifetime; + address->prefixlen = prefixlen; + address->broadcast.s_addr = addr.s_addr | ~netmask.s_addr; + + /* use update rather than configure so that we will update the lifetime + of an existing address if it has already been configured */ + r = address_update(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_update_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + int r; + + assert(m); + assert(link); + assert(link->ifname); + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return 1; + + r = sd_rtnl_message_get_errno(m); + if (r < 0 && r != -ENOENT) + log_struct_link(LOG_WARNING, link, + "MESSAGE=%-*s: could not update address: %s", + IFNAMSIZ, + link->ifname, strerror(-r), + "ERRNO=%d", -r, + NULL); + + return 1; +} + +static int address_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + int r; + + assert(m); + assert(link); + assert(link->ifname); + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return 1; + + r = sd_rtnl_message_get_errno(m); + if (r < 0 && r != -EADDRNOTAVAIL) + log_struct_link(LOG_WARNING, link, + "MESSAGE=%-*s: could not drop address: %s", + IFNAMSIZ, + link->ifname, strerror(-r), + "ERRNO=%d", -r, + NULL); + + return 1; +} + +static int set_hostname_handler(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *ret_error) { + _cleanup_link_unref_ Link *link = userdata; + int r; + + assert(link); + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return 1; + + r = sd_bus_message_get_errno(m); + if (r < 0) + log_warning_link(link, "Could not set hostname: %s", strerror(-r)); + + return 1; +} + +static int link_set_hostname(Link *link, const char *hostname) { + _cleanup_bus_message_unref_ sd_bus_message *m = NULL; + int r = 0; + + assert(link); + assert(link->manager); + assert(hostname); + + log_debug_link(link, "Setting transient hostname: '%s'", hostname); + + if (!link->manager->bus) { /* TODO: replace by assert when we can rely on kdbus */ + log_info_link(link, "Not connected to system bus, ignoring transient hostname."); + return 0; + } + + r = sd_bus_message_new_method_call( + link->manager->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(link->manager->bus, NULL, m, set_hostname_handler, link, 0); + if (r < 0) { + log_error_link(link, "Could not set transient hostname: %s", strerror(-r)); + return r; + } + + link_ref(link); + + return 0; +} + +static int set_mtu_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + int r; + + assert(m); + assert(link); + assert(link->ifname); + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + 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", + IFNAMSIZ, 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; + } + + link_ref(link); + + return 0; +} + +static int dhcp_lease_lost(Link *link) { + _cleanup_address_free_ Address *address = NULL; + struct in_addr addr; + struct in_addr netmask; + struct in_addr gateway; + unsigned prefixlen; + int r; + + assert(link); + assert(link->dhcp_lease); + + log_warning_link(link, "DHCP lease lost"); + + if (link->network->dhcp_routes) { + struct sd_dhcp_route *routes; + int n, i; + + n = sd_dhcp_lease_get_routes(link->dhcp_lease, &routes); + if (n >= 0) { + for (i = 0; i < n; i++) { + _cleanup_route_free_ Route *route = NULL; + + r = route_new_dynamic(&route); + if (r >= 0) { + route->family = AF_INET; + route->in_addr.in = routes[i].gw_addr; + route->dst_addr.in = routes[i].dst_addr; + route->dst_prefixlen = routes[i].dst_prefixlen; + + route_drop(route, link, &route_drop_handler); + } + } + } + } + + r = address_new_dynamic(&address); + if (r >= 0) { + r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway); + if (r >= 0) { + _cleanup_route_free_ Route *route_gw = NULL; + _cleanup_route_free_ Route *route = NULL; + + 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); + } + } + + 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 = link_set_hostname(link, ""); + if (r < 0) + log_error_link(link, "Failed to reset transient hostname"); + } + } + + link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease); + + return 0; +} + +static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) { + sd_dhcp_lease *lease; + int r; + + r = sd_dhcp_client_get_lease(client, &lease); + if (r < 0) { + log_warning_link(link, "DHCP error: no lease %s", + strerror(-r)); + return r; + } + + sd_dhcp_lease_unref(link->dhcp_lease); + link->dhcp_lease = lease; + + link_enter_set_addresses(link); + + 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; + 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 && r != -ENOENT) { + log_warning_link(link, "DHCP error: could not get gateway: %s", + strerror(-r)); + return r; + } + + if (r >= 0) + log_struct_link(LOG_INFO, link, + "MESSAGE=%-*s: DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u", + IFNAMSIZ, + 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); + else + log_struct_link(LOG_INFO, link, + "MESSAGE=%-*s: DHCPv4 address %u.%u.%u.%u/%u", + IFNAMSIZ, + link->ifname, + ADDRESS_FMT_VAL(address), + prefixlen, + "ADDRESS=%u.%u.%u.%u", + ADDRESS_FMT_VAL(address), + "PREFIXLEN=%u", + prefixlen, + NULL); + + link->dhcp_lease = lease; + + 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 = link_set_hostname(link, hostname); + if (r < 0) + log_error_link(link, "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 (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + 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_RENEW: + r = dhcp_lease_renew(client, link); + 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: client failed: %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", + IFNAMSIZ, + 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); + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return; + + 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 void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) { + Link *link = userdata; + + assert(link); + assert(link->network); + assert(link->manager); + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return; + + switch(event) { + case DHCP6_EVENT_STOP: + case DHCP6_EVENT_RESEND_EXPIRE: + case DHCP6_EVENT_RETRANS_MAX: + case DHCP6_EVENT_IP_ACQUIRE: + log_debug_link(link, "DHCPv6 event %d", event); + + break; + + default: + if (event < 0) + log_warning_link(link, "DHCPv6 error: %s", + strerror(-event)); + else + log_warning_link(link, "DHCPv6 unknown event: %d", + event); + return; + } +} + +static void icmp6_router_handler(sd_icmp6_nd *nd, int event, void *userdata) { + Link *link = userdata; + int r; + + assert(link); + assert(link->network); + assert(link->manager); + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return; + + switch(event) { + case ICMP6_EVENT_ROUTER_ADVERTISMENT_NONE: + case ICMP6_EVENT_ROUTER_ADVERTISMENT_OTHER: + return; + + case ICMP6_EVENT_ROUTER_ADVERTISMENT_TIMEOUT: + case ICMP6_EVENT_ROUTER_ADVERTISMENT_MANAGED: + break; + + default: + if (event < 0) + log_warning_link(link, "ICMPv6 error: %s", + strerror(-event)); + else + log_warning_link(link, "ICMPv6 unknown event: %d", + event); + + return; + } + + if (link->dhcp6_client) + return; + + r = sd_dhcp6_client_new(&link->dhcp6_client); + if (r < 0) + return; + + r = sd_dhcp6_client_attach_event(link->dhcp6_client, NULL, 0); + if (r < 0) { + link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); + return; + } + + r = sd_dhcp6_client_set_mac(link->dhcp6_client, &link->mac); + if (r < 0) { + link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); + return; + } + + r = sd_dhcp6_client_set_index(link->dhcp6_client, link->ifindex); + if (r < 0) { + link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); + return; + } + + r = sd_dhcp6_client_set_callback(link->dhcp6_client, dhcp6_handler, + link); + if (r < 0) { + link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); + return; + } + + r = sd_dhcp6_client_start(link->dhcp6_client); + if (r < 0) + link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); +} + +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) { + log_warning_link(link, "could not acquire IPv4 " + "link-local address"); + return r; + } + } + + if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V4)) { + assert(link->dhcp_client); + + log_debug_link(link, "acquiring DHCPv4 lease"); + + r = sd_dhcp_client_start(link->dhcp_client); + if (r < 0) { + log_warning_link(link, "could not acquire DHCPv4 " + "lease"); + return r; + } + } + + if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V6)) { + assert(link->icmp6_router_discovery); + + log_debug_link(link, "discovering IPv6 routers"); + + r = sd_icmp6_router_solicitation_start(link->icmp6_router_discovery); + if (r < 0) { + log_warning_link(link, "could not start IPv6 router discovery"); + return r; + } + } + + return 0; +} + +bool link_has_carrier(unsigned flags, uint8_t operstate) { + /* see Documentation/networking/operstates.txt in the kernel sources */ + + if (operstate == IF_OPER_UP) + return true; + + if (operstate == IF_OPER_UNKNOWN) + /* operstate may not be implemented, so fall back to flags */ + if ((flags & IFF_LOWER_UP) && !(flags & IFF_DORMANT)) + return true; + + return false; +} + +#define FLAG_STRING(string, flag, old, new) \ + (((old ^ new) & flag) \ + ? ((old & flag) ? (" -" string) : (" +" string)) \ + : "") + +static int link_update_flags(Link *link, sd_rtnl_message *m) { + unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags; + uint8_t operstate; + bool carrier_gained = false, carrier_lost = false; + int r; + + assert(link); + + r = sd_rtnl_message_link_get_flags(m, &flags); + if (r < 0) { + log_warning_link(link, "Could not get link flags"); + return r; + } + + r = sd_rtnl_message_read_u8(m, IFLA_OPERSTATE, &operstate); + if (r < 0) + /* if we got a message without operstate, take it to mean + the state was unchanged */ + operstate = link->kernel_operstate; + + if ((link->flags == flags) && (link->kernel_operstate == operstate)) + return 0; + + if (link->flags != flags) { + log_debug_link(link, "flags change:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s", + FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags), + FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags), + FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags), + FLAG_STRING("UP", IFF_UP, link->flags, flags), + FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags), + FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags), + FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags), + FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags), + FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags), + FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags), + FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags), + FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags), + FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags), + FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags), + FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags), + FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags), + FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags), + FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags), + FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags)); + + unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP | + IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING | + IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT | + IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL | + IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP | + IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO); + unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags); + unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags); + + /* link flags are currently at most 18 bits, let's align to printing 20 */ + if (unknown_flags_added) + log_debug_link(link, "unknown link flags gained: %#.5x (ignoring)", + unknown_flags_added); + + if (unknown_flags_removed) + log_debug_link(link, "unknown link flags lost: %#.5x (ignoring)", + unknown_flags_removed); + } + + carrier_gained = !link_has_carrier(link->flags, link->kernel_operstate) && + link_has_carrier(flags, operstate); + carrier_lost = link_has_carrier(link->flags, link->kernel_operstate) && + !link_has_carrier(flags, operstate); + + link->flags = flags; + link->kernel_operstate = operstate; + + link_save(link); + + if (link->state == LINK_STATE_FAILED || + link->state == LINK_STATE_UNMANAGED) + return 0; + + if (carrier_gained) { + log_info_link(link, "gained carrier"); + + if (link->network) { + r = link_acquire_conf(link); + if (r < 0) { + link_enter_failed(link); + return r; + } + } + } else if (carrier_lost) { + log_info_link(link, "lost carrier"); + + r = link_stop_clients(link); + if (r < 0) { + link_enter_failed(link); + return r; + } + } + + return 0; +} + +static int link_up_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + int r; + + assert(link); + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return 1; + + r = sd_rtnl_message_get_errno(m); + if (r < 0) { + /* we warn but don't fail the link, as it may + be brought up later */ + log_struct_link(LOG_WARNING, link, + "MESSAGE=%-*s: could not bring up interface: %s", + IFNAMSIZ, + 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; + } + + link_ref(link); + + return 0; +} + +static int link_joined(Link *link) { + int r; + + assert(link); + assert(link->state == LINK_STATE_ENSLAVING); + assert(link->network); + + log_debug_link(link, "joined netdev"); + + if (!(link->flags & IFF_UP)) { + r = link_up(link); + if (r < 0) { + link_enter_failed(link); + return r; + } + } + + return link_enter_set_addresses(link); +} + +static int netdev_join_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + int r; + + assert(link); + assert(IN_SET(link->state, LINK_STATE_ENSLAVING, LINK_STATE_FAILED, + LINK_STATE_LINGER)); + assert(link->network); + + link->enslaving --; + + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return 1; + + r = sd_rtnl_message_get_errno(m); + if (r < 0 && r != -EEXIST) { + log_struct_link(LOG_ERR, link, + "MESSAGE=%-*s: could not join netdev: %s", + IFNAMSIZ, + link->ifname, strerror(-r), + "ERRNO=%d", -r, + NULL); + link_enter_failed(link); + return 1; + } + + if (link->enslaving <= 0) + link_joined(link); + + return 1; +} + +static int link_enter_join_netdev(Link *link) { + NetDev *vlan, *macvlan, *vxlan; + Iterator i; + int r; + + assert(link); + assert(link->network); + assert(link->state == LINK_STATE_INITIALIZING); + + link->state = LINK_STATE_ENSLAVING; + + link_save(link); + + if (!link->network->bridge && + !link->network->bond && + !link->network->tunnel && + hashmap_isempty(link->network->vlans) && + hashmap_isempty(link->network->macvlans) && + hashmap_isempty(link->network->vxlans)) + return link_joined(link); + + if (link->network->bond) { + log_struct_link(LOG_DEBUG, link, + "MESSAGE=%-*s: enslaving by '%s'", + IFNAMSIZ, + link->ifname, link->network->bond->ifname, + NETDEV(link->network->bond), + NULL); + + r = netdev_join(link->network->bond, link, &netdev_join_handler); + if (r < 0) { + log_struct_link(LOG_WARNING, link, + "MESSAGE=%-*s: could not join netdev '%s': %s", + IFNAMSIZ, + link->ifname, link->network->bond->ifname, strerror(-r), + NETDEV(link->network->bond), + NULL); + link_enter_failed(link); + return r; + } + + link->enslaving ++; + } + + if (link->network->bridge) { + log_struct_link(LOG_DEBUG, link, + "MESSAGE=%-*s: enslaving by '%s'", + IFNAMSIZ, + link->ifname, link->network->bridge->ifname, + NETDEV(link->network->bridge), + NULL); + + r = netdev_join(link->network->bridge, link, &netdev_join_handler); + if (r < 0) { + log_struct_link(LOG_WARNING, link, + "MESSAGE=%-*s: could not join netdev '%s': %s", + IFNAMSIZ, + link->ifname, link->network->bridge->ifname, strerror(-r), + NETDEV(link->network->bridge), + NULL); + link_enter_failed(link); + return r; + } + + link->enslaving ++; + } + + if (link->network->tunnel) { + log_struct_link(LOG_DEBUG, link, + "MESSAGE=%-*s: enslaving by '%s'", + IFNAMSIZ, + link->ifname, link->network->tunnel->ifname, + NETDEV(link->network->tunnel), + NULL); + + r = netdev_join(link->network->tunnel, link, &netdev_join_handler); + if (r < 0) { + log_struct_link(LOG_WARNING, link, + "MESSAGE=%-*s: could not join netdev '%s': %s", + IFNAMSIZ, + link->ifname, link->network->tunnel->ifname, strerror(-r), + NETDEV(link->network->tunnel), + 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'", + IFNAMSIZ, + link->ifname, vlan->ifname, NETDEV(vlan), NULL); + + r = netdev_join(vlan, link, &netdev_join_handler); + if (r < 0) { + log_struct_link(LOG_WARNING, link, + "MESSAGE=%-*s: could not join netdev '%s': %s", + IFNAMSIZ, + link->ifname, vlan->ifname, 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'", + IFNAMSIZ, + link->ifname, macvlan->ifname, NETDEV(macvlan), NULL); + + r = netdev_join(macvlan, link, &netdev_join_handler); + if (r < 0) { + log_struct_link(LOG_WARNING, link, + "MESSAGE=%-*s: could not join netdev '%s': %s", + IFNAMSIZ, + link->ifname, macvlan->ifname, strerror(-r), + NETDEV(macvlan), NULL); + link_enter_failed(link); + return r; + } + + link->enslaving ++; + } + + HASHMAP_FOREACH(vxlan, link->network->vxlans, i) { + log_struct_link(LOG_DEBUG, link, + "MESSAGE=%*s: enslaving by '%s'", + IFNAMSIZ, + link->ifname, vxlan->ifname, NETDEV(vxlan), NULL); + + r = netdev_join(vxlan, link, &netdev_join_handler); + if (r < 0) { + log_struct_link(LOG_WARNING, link, + "MESSAGE=%*s: could not join netdev '%s': %s", + IFNAMSIZ, + link->ifname, vxlan->ifname, strerror(-r), + NETDEV(vxlan), NULL); + link_enter_failed(link); + return r; + } + + link->enslaving ++; + } + + return 0; +} + +static int link_configure(Link *link) { + int r; + + assert(link); + assert(link->state == LINK_STATE_INITIALIZING); + + if (link->network->ipv4ll) { + uint8_t seed[8]; + + r = sd_ipv4ll_new(&link->ipv4ll); + if (r < 0) + return r; + + if (link->udev_device) { + 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_mac(link->ipv4ll, &link->mac); + 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 (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V4)) { + 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_mac(link->dhcp_client, &link->mac); + 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; + + r = sd_dhcp_client_set_request_broadcast(link->dhcp_client, link->network->dhcp_broadcast); + 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; + } + + if (link->network->dhcp_routes) { + r = sd_dhcp_client_set_request_option(link->dhcp_client, DHCP_OPTION_STATIC_ROUTE); + if (r < 0) + return r; + r = sd_dhcp_client_set_request_option(link->dhcp_client, DHCP_OPTION_CLASSLESS_STATIC_ROUTE); + if (r < 0) + return r; + } + + if (link->network->dhcp_sendhost) { + _cleanup_free_ char *hostname = gethostname_malloc(); + if (!hostname) + return -ENOMEM; + + if (!is_localhost(hostname)) { + r = sd_dhcp_client_set_hostname(link->dhcp_client, hostname); + if (r < 0) + return r; + } + } + + if (link->network->dhcp_vendor_class_identifier) { + r = sd_dhcp_client_set_vendor_class_identifier(link->dhcp_client, + link->network->dhcp_vendor_class_identifier); + if (r < 0) + return r; + } + } + + if (link->network->dhcp_server) { + r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex); + if (r < 0) + return r; + + r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0); + if (r < 0) + return r; + } + + if (IN_SET(link->network->dhcp, DHCP_SUPPORT_BOTH, DHCP_SUPPORT_V6)) { + r = sd_icmp6_nd_new(&link->icmp6_router_discovery); + if (r < 0) + return r; + + r = sd_icmp6_nd_attach_event(link->icmp6_router_discovery, + NULL, 0); + if (r < 0) + return r; + + r = sd_icmp6_nd_set_mac(link->icmp6_router_discovery, + &link->mac); + if (r < 0) + return r; + + r = sd_icmp6_nd_set_index(link->icmp6_router_discovery, + link->ifindex); + if (r < 0) + return r; + + r = sd_icmp6_nd_set_callback(link->icmp6_router_discovery, + icmp6_router_handler, link); + if (r < 0) + return r; + } + + if (link_has_carrier(link->flags, link->kernel_operstate)) { + r = link_acquire_conf(link); + if (r < 0) + return r; + } + + return link_enter_join_netdev(link); +} + +static int link_initialized_and_synced(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { + _cleanup_link_unref_ Link *link = userdata; + Network *network; + int r; + + assert(link); + assert(link->ifname); + assert(link->manager); + + if (link->state != LINK_STATE_INITIALIZING) + return 1; + + log_debug_link(link, "link state is up-to-date"); + + r = network_get(link->manager, link->udev_device, link->ifname, &link->mac, &network); + if (r == -ENOENT) { + link_enter_unmanaged(link); + return 1; + } else if (r < 0) + return r; + + r = network_apply(link->manager, network, link); + if (r < 0) + return r; + + r = link_configure(link); + if (r < 0) + return r; + + return 1; +} + +int link_initialized(Link *link, struct udev_device *device) { + _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL; + int r; + + assert(link); + assert(link->manager); + assert(link->manager->rtnl); + assert(device); + + if (link->state != LINK_STATE_INITIALIZING) + return 0; + + if (link->udev_device) + return 0; + + log_debug_link(link, "udev initialized link"); + + link->udev_device = udev_device_ref(device); + + /* udev has initialized the link, but we don't know if we have yet processed + the NEWLINK messages with the latest state. Do a GETLINK, when it returns + we know that the pending NEWLINKs have already been processed and that we + are up-to-date */ + + r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex); + if (r < 0) + return r; + + r = sd_rtnl_call_async(link->manager->rtnl, req, link_initialized_and_synced, link, 0, NULL); + if (r < 0) + return r; + + link_ref(link); + + return 0; +} + +int link_rtnl_process_address(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) { + Manager *m = userdata; + Link *link = NULL; + uint16_t type; + _cleanup_address_free_ Address *address = NULL; + Address *ad; + char buf[INET6_ADDRSTRLEN]; + bool address_dropped = false; + int r, ifindex; + + assert(rtnl); + assert(message); + assert(m); + + r = sd_rtnl_message_get_type(message, &type); + if (r < 0) { + log_warning("rtnl: could not get message type"); + return 0; + } + + r = sd_rtnl_message_addr_get_ifindex(message, &ifindex); + if (r < 0 || ifindex <= 0) { + log_warning("rtnl: received address message without valid ifindex, ignoring"); + return 0; + } else { + r = link_get(m, ifindex, &link); + if (r < 0 || !link) { + log_warning("rtnl: received address for a nonexistent link, ignoring"); + return 0; + } + } + + r = address_new_dynamic(&address); + if (r < 0) + return r; + + r = sd_rtnl_message_addr_get_family(message, &address->family); + if (r < 0 || !IN_SET(address->family, AF_INET, AF_INET6)) { + log_warning_link(link, "rtnl: received address with invalid family, ignoring"); + return 0; + } + + r = sd_rtnl_message_addr_get_prefixlen(message, &address->prefixlen); + if (r < 0) { + log_warning_link(link, "rtnl: received address with invalid prefixlen, ignoring"); + return 0; + } + + r = sd_rtnl_message_addr_get_scope(message, &address->scope); + if (r < 0) { + log_warning_link(link, "rtnl: received address with invalid scope, ignoring"); + return 0; + } + + switch (address->family) { + case AF_INET: + r = sd_rtnl_message_read_in_addr(message, IFA_LOCAL, &address->in_addr.in); + if (r < 0) { + log_warning_link(link, "rtnl: received address without valid address, ignoring"); + return 0; + } + + break; + + case AF_INET6: + r = sd_rtnl_message_read_in6_addr(message, IFA_ADDRESS, &address->in_addr.in6); + if (r < 0) { + log_warning_link(link, "rtnl: received address without valid address, ignoring"); + return 0; + } + + break; + + default: + assert_not_reached("invalid address family"); + } + + if (!inet_ntop(address->family, &address->in_addr, buf, INET6_ADDRSTRLEN)) { + log_warning_link(link, "could not print address"); + return 0; + } + + LIST_FOREACH(addresses, ad, link->addresses) { + if (address_equal(ad, address)) { + LIST_REMOVE(addresses, link->addresses, ad); + + address_free(ad); + + address_dropped = true; + + break; + } + } + + switch (type) { + case RTM_NEWADDR: + if (!address_dropped) + log_debug_link(link, "added address: %s/%u", buf, + address->prefixlen); + else + log_debug_link(link, "updated address: %s/%u", buf, + address->prefixlen); + + LIST_PREPEND(addresses, link->addresses, address); + address = NULL; + + link_save(link); + + break; + case RTM_DELADDR: + if (address_dropped) { + log_debug_link(link, "removed address: %s/%u", buf, + address->prefixlen); + + link_save(link); + } else + log_warning_link(link, "removing non-existent address: %s/%u", + buf, address->prefixlen); + + break; + default: + assert_not_reached("Received invalid RTNL message type"); + } + + return 1; +} + +int link_add(Manager *m, sd_rtnl_message *message, Link **ret) { + Link *link; + _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL; + _cleanup_udev_device_unref_ struct udev_device *device = NULL; + char ifindex_str[2 + DECIMAL_STR_MAX(int)]; + int r; + + assert(m); + assert(m->rtnl); + assert(message); + assert(ret); + + r = link_new(m, message, ret); + if (r < 0) + return r; + + link = *ret; + + log_debug_link(link, "link %"PRIu64" added", link->ifindex); + + r = sd_rtnl_message_new_addr(m->rtnl, &req, RTM_GETADDR, link->ifindex, 0); + if (r < 0) + return r; + + r = sd_rtnl_call_async(m->rtnl, req, link_get_address_handler, link, 0, NULL); + if (r < 0) + return r; + + link_ref(link); + + if (detect_container(NULL) <= 0) { + /* not in a container, udev will be around */ + sprintf(ifindex_str, "n%"PRIu64, link->ifindex); + device = udev_device_new_from_device_id(m->udev, ifindex_str); + if (!device) { + log_warning_link(link, "could not find udev device"); + return -errno; + } + + if (udev_device_get_is_initialized(device) <= 0) { + /* not yet ready */ + log_debug_link(link, "udev initializing link..."); + return 0; + } + + r = link_initialized(link, device); + if (r < 0) + return r; + } else { + /* we are calling a callback directly, so must take a ref */ + link_ref(link); + + r = link_initialized_and_synced(m->rtnl, NULL, link); + if (r < 0) + return r; + } + + return 0; +} + +int link_update(Link *link, sd_rtnl_message *m) { + struct ether_addr mac; + char *ifname; + int r; + + assert(link); + assert(link->ifname); + assert(m); + + if (link->state == LINK_STATE_LINGER) { + link_ref(link); + log_info_link(link, "link readded"); + link->state = LINK_STATE_ENSLAVING; + } + + r = sd_rtnl_message_read_string(m, IFLA_IFNAME, &ifname); + if (r >= 0 && !streq(ifname, link->ifname)) { + log_info_link(link, "renamed to %s", ifname); + + free(link->ifname); + link->ifname = strdup(ifname); + if (!link->ifname) + return -ENOMEM; + } + + if (!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; + } + } + + if (link->dhcp6_client) { + r = sd_dhcp6_client_set_mac(link->dhcp6_client, + &link->mac); + if (r < 0) { + log_warning_link(link, "Could not update MAC address in DHCPv6 client: %s", + strerror(-r)); + return r; + } + } + } + } + + return link_update_flags(link, m); +} + +static void serialize_addresses(FILE *f, const char *key, Address *address) { + Address *ad; + + assert(f); + assert(key); + + if (!address) + return; + + fprintf(f, "%s=", key); + + LIST_FOREACH(addresses, ad, address) { + char buf[INET6_ADDRSTRLEN]; + + if (inet_ntop(ad->family, &ad->in_addr, buf, INET6_ADDRSTRLEN)) + fprintf(f, "%s%s", buf, (ad->addresses_next) ? " ": ""); + } + + fputs("\n", f); +} + +static void link_update_operstate(Link *link) { + + assert(link); + + if (link->kernel_operstate == IF_OPER_DORMANT) + link->operstate = LINK_OPERSTATE_DORMANT; + else if (link_has_carrier(link->flags, link->kernel_operstate)) { + Address *address; + uint8_t scope = RT_SCOPE_NOWHERE; + + /* if we have carrier, check what addresses we have */ + LIST_FOREACH(addresses, address, link->addresses) { + if (address->scope < scope) + scope = address->scope; + } + + if (scope < RT_SCOPE_SITE) + /* universally accessible addresses found */ + link->operstate = LINK_OPERSTATE_ROUTABLE; + else if (scope < RT_SCOPE_HOST) + /* only link or site local addresses found */ + link->operstate = LINK_OPERSTATE_DEGRADED; + else + /* no useful addresses found */ + link->operstate = LINK_OPERSTATE_CARRIER; + } else + link->operstate = LINK_OPERSTATE_UNKNOWN; +} + +int link_save(Link *link) { + _cleanup_free_ char *temp_path = NULL; + _cleanup_fclose_ FILE *f = NULL; + const char *admin_state, *oper_state; + int r; + + assert(link); + assert(link->state_file); + assert(link->lease_file); + assert(link->manager); + + link_update_operstate(link); + + r = manager_save(link->manager); + if (r < 0) + return r; + + if (link->state == LINK_STATE_LINGER) { + unlink(link->state_file); + return 0; + } + + admin_state = link_state_to_string(link->state); + assert(admin_state); + + oper_state = link_operstate_to_string(link->operstate); + assert(oper_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" + "ADMIN_STATE=%s\n" + "OPER_STATE=%s\n" + "FLAGS=%u\n", + admin_state, oper_state, link->flags); + + if (link->network) { + serialize_addresses(f, "DNS", link->network->dns); + serialize_addresses(f, "NTP", link->network->ntp); + } + + if (link->dhcp_lease) { + assert(link->network); + + r = dhcp_lease_save(link->dhcp_lease, link->lease_file); + if (r < 0) + goto finish; + + fprintf(f, + "DHCP_LEASE=%s\n" + "DHCP_USE_DNS=%s\n" + "DHCP_USE_NTP=%s\n", + link->lease_file, + yes_no(link->network->dhcp_dns), + yes_no(link->network->dhcp_ntp)); + } else + unlink(link->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_link(link, "Failed to save link data to %s: %s", link->state_file, strerror(-r)); + + return r; +} + +static const char* const link_state_table[_LINK_STATE_MAX] = { + [LINK_STATE_INITIALIZING] = "initializing", + [LINK_STATE_ENSLAVING] = "configuring", + [LINK_STATE_SETTING_ADDRESSES] = "configuring", + [LINK_STATE_SETTING_ROUTES] = "configuring", + [LINK_STATE_CONFIGURED] = "configured", + [LINK_STATE_UNMANAGED] = "unmanaged", + [LINK_STATE_FAILED] = "failed", + [LINK_STATE_LINGER] = "linger", +}; + +DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState); + +static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = { + [LINK_OPERSTATE_UNKNOWN] = "unknown", + [LINK_OPERSTATE_DORMANT] = "dormant", + [LINK_OPERSTATE_CARRIER] = "carrier", + [LINK_OPERSTATE_DEGRADED] = "degraded", + [LINK_OPERSTATE_ROUTABLE] = "routable", +}; + +DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState); + +static const char* const dhcp_support_table[_DHCP_SUPPORT_MAX] = { + [DHCP_SUPPORT_NONE] = "none", + [DHCP_SUPPORT_BOTH] = "both", + [DHCP_SUPPORT_V4] = "v4", + [DHCP_SUPPORT_V6] = "v6", +}; + +DEFINE_STRING_TABLE_LOOKUP(dhcp_support, DHCPSupport); + +int config_parse_dhcp( + const char* unit, + const char *filename, + unsigned line, + const char *section, + unsigned section_line, + const char *lvalue, + int ltype, + const char *rvalue, + void *data, + void *userdata) { + + DHCPSupport *dhcp = data; + int k; + + assert(filename); + assert(lvalue); + assert(rvalue); + assert(data); + + /* Our enum shall be a superset of booleans, hence first try + * to parse as boolean, and then as enum */ + + k = parse_boolean(rvalue); + if (k > 0) + *dhcp = DHCP_SUPPORT_BOTH; + else if (k == 0) + *dhcp = DHCP_SUPPORT_NONE; + else { + DHCPSupport s; + + s = dhcp_support_from_string(rvalue); + if (s < 0){ + log_syntax(unit, LOG_ERR, filename, line, -s, "Failed to parse DHCP option, ignoring: %s", rvalue); + return 0; + } + + *dhcp = s; + } return 0; }