+
+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) {
+ int r;
+
+ assert(link);
+ assert(link->network);
+
+ if (link->state == LINK_STATE_FAILED)
+ return 0;
+
+ if (link->flags == flags)
+ return 0;
+
+ log_debug_link(link, "link status updated: %#.8x -> %#.8x",
+ link->flags, flags);
+
+ if ((link->flags & IFF_UP) != (flags & IFF_UP))
+ log_info_link(link,
+ "link is %s", flags & IFF_UP ? "up": "down");
+
+ if ((link->flags & IFF_LOWER_UP) != (flags & IFF_LOWER_UP)) {
+ if (flags & IFF_LOWER_UP) {
+ log_info_link(link, "carrier on");
+
+ if (link->network->dhcp || link->network->ipv4ll) {
+ r = link_acquire_conf(link);
+ if (r < 0) {
+ log_warning_link(link, "Could not acquire configuration: %s", strerror(-r));
+ link_enter_failed(link);
+ return r;
+ }
+ }
+ } else {
+ log_info_link(link, "carrier off");
+
+ if (link->network->dhcp) {
+ r = sd_dhcp_client_stop(link->dhcp_client);
+ if (r < 0) {
+ log_warning_link(link, "Could not stop DHCPv4 client: %s", strerror(-r));
+ link_enter_failed(link);
+ return r;
+ }
+ }
+
+ if (link->network->ipv4ll) {
+ r = sd_ipv4ll_stop(link->ipv4ll);
+ if (r < 0) {
+ log_warning_link(link, "Could not stop IPv4 link-local: %s", strerror(-r));
+ link_enter_failed(link);
+ return r;
+ }
+ }
+ }
+ }
+
+ link->flags = flags;
+
+ return 0;
+}
+
+static int link_up_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
+ Link *link = userdata;
+ int r;
+
+ assert(link);
+
+ if (link->state == LINK_STATE_FAILED)
+ return 1;
+
+ r = sd_rtnl_message_get_errno(m);
+ if (r >= 0)
+ link_update_flags(link, link->flags | IFF_UP);
+ else
+ log_struct_link(LOG_WARNING, link,
+ "MESSAGE=%s: could not bring up interface: %s",
+ link->ifname, strerror(-r),
+ "ERRNO=%d", -r,
+ NULL);
+ return 1;
+}
+
+static int link_up(Link *link) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
+ int r;
+
+ assert(link);
+ assert(link->manager);
+ assert(link->manager->rtnl);
+
+ log_debug_link(link, "bringing link up");
+
+ r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
+ RTM_SETLINK, link->ifindex);
+ if (r < 0) {
+ log_error_link(link, "Could not allocate RTM_SETLINK message");
+ return r;
+ }
+
+ r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
+ if (r < 0) {
+ log_error_link(link, "Could not set link flags: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_rtnl_call_async(link->manager->rtnl, req, link_up_handler, link, 0, NULL);
+ if (r < 0) {
+ log_error_link(link,
+ "Could not send rtnetlink message: %s", strerror(-r));
+ return r;
+ }
+
+ return 0;
+}
+
+static int link_enslaved(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->state == LINK_STATE_ENSLAVING);
+ assert(link->network);
+
+ r = link_up(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return r;
+ }
+
+ if (!link->network->dhcp && !link->network->ipv4ll)
+ return link_enter_set_addresses(link);
+
+ return 0;
+}
+
+static int enslave_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
+ Link *link = userdata;
+ int r;
+
+ assert(link);
+ assert(link->state == LINK_STATE_ENSLAVING || link->state == LINK_STATE_FAILED);
+ assert(link->network);
+
+ link->enslaving --;
+
+ if (link->state == LINK_STATE_FAILED)
+ return 1;
+
+ r = sd_rtnl_message_get_errno(m);
+ if (r < 0) {
+ log_struct_link(LOG_ERR, link,
+ "MESSAGE=%s: could not enslave: %s",
+ link->ifname, strerror(-r),
+ "ERRNO=%d", -r,
+ NULL);
+ link_enter_failed(link);
+ return 1;
+ }
+
+ log_debug_link(link, "enslaved");
+
+ if (link->enslaving == 0)
+ link_enslaved(link);
+
+ return 1;
+}
+
+static int link_enter_enslave(Link *link) {
+ NetDev *vlan, *macvlan;
+ Iterator i;
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->state == _LINK_STATE_INVALID);
+
+ link->state = LINK_STATE_ENSLAVING;
+
+ link_save(link);
+
+ if (!link->network->bridge && !link->network->bond &&
+ hashmap_isempty(link->network->vlans) &&
+ hashmap_isempty(link->network->macvlans))
+ return link_enslaved(link);
+
+ if (link->network->bridge) {
+ log_struct_link(LOG_DEBUG, link,
+ "MESSAGE=%s: enslaving by '%s'",
+ link->ifname, link->network->bridge->name,
+ NETDEV(link->network->bridge),
+ NULL);
+
+ r = netdev_enslave(link->network->bridge, link, &enslave_handler);
+ if (r < 0) {
+ log_struct_link(LOG_WARNING, link,
+ "MESSAGE=%s: could not enslave by '%s': %s",
+ link->ifname, link->network->bridge->name, strerror(-r),
+ NETDEV(link->network->bridge),
+ NULL);
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->enslaving ++;
+ }
+
+ if (link->network->bond) {
+ log_struct_link(LOG_DEBUG, link,
+ "MESSAGE=%s: enslaving by '%s'",
+ link->ifname, link->network->bond->name,
+ NETDEV(link->network->bond),
+ NULL);
+
+ r = netdev_enslave(link->network->bond, link, &enslave_handler);
+ if (r < 0) {
+ log_struct_link(LOG_WARNING, link,
+ "MESSAGE=%s: could not enslave by '%s': %s",
+ link->ifname, link->network->bond->name, strerror(-r),
+ NETDEV(link->network->bond),
+ NULL);
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->enslaving ++;
+ }
+
+ HASHMAP_FOREACH(vlan, link->network->vlans, i) {
+ log_struct_link(LOG_DEBUG, link,
+ "MESSAGE=%s: enslaving by '%s'",
+ link->ifname, vlan->name, NETDEV(vlan), NULL);
+
+ r = netdev_enslave(vlan, link, &enslave_handler);
+ if (r < 0) {
+ log_struct_link(LOG_WARNING, link,
+ "MESSAGE=%s: could not enslave by '%s': %s",
+ link->ifname, vlan->name, strerror(-r),
+ NETDEV(vlan), NULL);
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->enslaving ++;
+ }
+
+ HASHMAP_FOREACH(macvlan, link->network->macvlans, i) {
+ log_struct_link(LOG_DEBUG, link,
+ "MESSAGE=%s: enslaving by '%s'",
+ link->ifname, macvlan->name, NETDEV(macvlan), NULL);
+
+ r = netdev_enslave(macvlan, link, &enslave_handler);
+ if (r < 0) {
+ log_struct_link(LOG_WARNING, link,
+ "MESSAGE=%s: could not enslave by '%s': %s",
+ link->ifname, macvlan->name, strerror(-r),
+ NETDEV(macvlan), NULL);
+ link_enter_failed(link);
+ return r;
+ }
+
+ link->enslaving ++;
+ }
+
+ return 0;
+}
+
+static int link_getlink_handler(sd_rtnl *rtnl, sd_rtnl_message *m,
+ void *userdata) {
+ Link *link = userdata;
+ int r;
+
+ assert(link);
+
+ if (link->state == LINK_STATE_FAILED)
+ return 1;
+
+ r = sd_rtnl_message_get_errno(m);
+ if (r < 0) {
+ log_struct_link(LOG_ERR, link,
+ "MESSAGE=%s: could not get state: %s",
+ link->ifname, strerror(-r),
+ "ERRNO=%d", -r,
+ NULL);
+ link_enter_failed(link);
+ return 1;
+ }
+
+ link_update(link, m);
+
+ return 1;
+}
+
+static int link_getlink(Link *link) {
+ _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
+ int r;
+
+ assert(link);
+ assert(link->manager);
+ assert(link->manager->rtnl);
+
+ log_debug_link(link, "requesting link status");
+
+ r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
+ RTM_GETLINK, link->ifindex);
+ if (r < 0) {
+ log_error_link(link, "Could not allocate RTM_GETLINK message");
+ return r;
+ }
+
+ r = sd_rtnl_call_async(link->manager->rtnl, req, link_getlink_handler,
+ link, 0, NULL);
+ if (r < 0) {
+ log_error_link(link,
+ "Could not send rtnetlink message: %s", strerror(-r));
+ return r;
+ }
+
+ return 0;
+}
+
+static int link_configure(Link *link) {
+ int r;
+
+ assert(link);
+ assert(link->state == _LINK_STATE_INVALID);
+
+ r = link_getlink(link);
+ if (r < 0)
+ return r;
+
+ return link_enter_enslave(link);
+}
+
+int link_add(Manager *m, struct udev_device *device, Link **ret) {
+ Link *link = NULL;
+ Network *network;
+ int r;
+
+ assert(m);
+ assert(device);
+
+ r = link_new(m, device, &link);
+ if (r < 0)
+ return r;
+
+ *ret = link;
+
+ r = network_get(m, device, &network);
+ if (r < 0)
+ return r == -ENOENT ? 0 : r;
+
+ r = network_apply(m, network, link);
+ if (r < 0)
+ return r;
+
+ if (link->network->ipv4ll) {
+ uint8_t seed[8];
+ r = sd_ipv4ll_new(&link->ipv4ll);
+ if (r < 0)
+ return r;
+
+ r = net_get_unique_predictable_data(link->udev_device, seed);
+ if (r >= 0) {
+ r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
+ if (r < 0)
+ return r;
+
+ r = sd_ipv4ll_set_index(link->ipv4ll, link->ifindex);
+ if (r < 0)
+ return r;
+
+ r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link);
+ if (r < 0)
+ return r;
+ }
+
+ if (link->network->dhcp) {
+ r = sd_dhcp_client_new(&link->dhcp_client);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_client_set_index(link->dhcp_client, link->ifindex);
+ if (r < 0)
+ return r;
+
+ r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp_handler, link);
+ if (r < 0)
+ return r;
+
+ if (link->network->dhcp_mtu) {
+ r = sd_dhcp_client_set_request_option(link->dhcp_client, 26);
+ if (r < 0)
+ return r;
+ }
+ }
+
+ r = link_configure(link);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+int link_update(Link *link, sd_rtnl_message *m) {
+ unsigned flags;
+ struct ether_addr mac;
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(m);
+
+ if (link->state == LINK_STATE_FAILED)
+ return 0;
+
+ if (link->network->dhcp && link->network->dhcp_mtu &&
+ !link->original_mtu) {
+ r = sd_rtnl_message_read_u16(m, IFLA_MTU, &link->original_mtu);
+ if (r >= 0)
+ log_debug_link(link, "saved original MTU: %"
+ PRIu16, link->original_mtu);
+ }
+
+ r = sd_rtnl_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
+ if (r < 0)
+ log_debug_link(link, "Could not get MAC address: %s", strerror(-r));
+ else {
+ 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;
+ int r;
+
+ assert(link);
+ assert(link->state_file);
+
+ r = fopen_temporary(link->state_file, &f, &temp_path);
+ if (r < 0)
+ goto finish;
+
+ fchmod(fileno(f), 0644);
+
+ fprintf(f,
+ "# This is private data. Do not parse.\n"
+ "STATE=%s\n",
+ link_state_to_string(link->state));
+
+ if (link->dhcp_lease) {
+ _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);