X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fnetwork%2Fnetworkd-link.c;h=26ef0feaae2d6c635d9fe6284e0db28adfb6b635;hp=8960b60ab1aa93e3bb0d68529a606bd15ce76399;hb=adeba5008eac3105ae59256dedd087ebe006a9e6;hpb=1f6d9bc9ee894d4023b7eacea1754986f25bce57 diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c index 8960b60ab..26ef0feaa 100644 --- a/src/network/networkd-link.c +++ b/src/network/networkd-link.c @@ -21,43 +21,200 @@ #include #include +#include -#include "networkd.h" +#include "networkd-link.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" -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; +#include "dhcp-lease-internal.h" + +static bool link_dhcp6_enabled(Link *link) { + if (link->flags & IFF_LOOPBACK) + return false; + + if (!link->network) + return false; + + return IN_SET(link->network->dhcp, DHCP_SUPPORT_V6, DHCP_SUPPORT_BOTH); +} + +static bool link_dhcp4_enabled(Link *link) { + if (link->flags & IFF_LOOPBACK) + return false; + + if (!link->network) + return false; + + return IN_SET(link->network->dhcp, DHCP_SUPPORT_V4, DHCP_SUPPORT_BOTH); +} + +static bool link_dhcp4_server_enabled(Link *link) { + if (link->flags & IFF_LOOPBACK) + return false; + + if (!link->network) + return false; + + return link->network->dhcp_server; +} + +static bool link_ipv4ll_enabled(Link *link) { + if (link->flags & IFF_LOOPBACK) + return false; + + if (!link->network) + return false; + + return link->network->ipv4ll; +} + +#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; int r; - assert(device); + 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); + } + + link->flags = flags; + link->kernel_operstate = operstate; + + link_save(link); + + return 0; +} + +static int link_new(Manager *manager, sd_rtnl_message *message, Link **ret) { + _cleanup_link_unref_ Link *link = NULL; + uint16_t type; + const char *ifname; + int r, ifindex; + + assert(manager); + assert(message); assert(ret); + r = sd_rtnl_message_get_type(message, &type); + if (r < 0) + return r; + else if (type != RTM_NEWLINK) + return -EINVAL; + + 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_PENDING; + 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/%d", + 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/%d", + link->ifindex); + if (r < 0) + return -ENOMEM; - r = hashmap_put(manager->links, &link->ifindex, link); + r = hashmap_ensure_allocated(&manager->links, NULL); + if (r < 0) + return r; + + r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link); + if (r < 0) + return r; + + r = link_update_flags(link, message); if (r < 0) return r; @@ -67,118 +224,315 @@ 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); + } - if (link->dhcp) - sd_dhcp_client_free(link->dhcp); + sd_dhcp_client_unref(link->dhcp_client); + sd_dhcp_lease_unref(link->dhcp_lease); - route_free(link->dhcp_route); - link->dhcp_route = NULL; + unlink(link->lease_file); + free(link->lease_file); - address_free(link->dhcp_address); - link->dhcp_address = NULL; + 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, INT_TO_PTR(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 **ret) { +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; assert(m); - assert(device); + assert(ifindex); + assert(ret); + + link = hashmap_get(m->links, INT_TO_PTR(ifindex)); + 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; - ifindex = udev_device_get_ifindex(device); - link = hashmap_get(m->links, &ifindex); - if (link) { - *ret = link; - return -EEXIST; + if (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; + } } - r = link_new(m, device, &link); - if (r < 0) - return r; + if (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; + } + } - *ret = link; + if(link->icmp6_router_discovery) { - devtype = udev_device_get_devtype(device); - if (streq_ptr(devtype, "bridge")) { - r = bridge_set_link(m, link); - if (r < 0 && r != -ENOENT) - return r; + 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; + } + } + + 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; + } } - r = network_get(m, device, &network); - if (r < 0) - return r == -ENOENT ? 0 : r; + return r; +} - r = network_apply(m, network, link); - if (r < 0) - return r; +void link_enter_failed(Link *link) { + assert(link); - return 0; + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return; + + log_warning_link(link, "failed"); + + link->state = LINK_STATE_FAILED; + + link_stop_clients(link); + + link_save(link); +} + +static Address* link_find_dhcp_server_address(Link *link) { + Address *address; + + assert(link); + assert(link->network); + + /* The the first statically configured address if there is any */ + LIST_FOREACH(addresses, address, link->network->static_addresses) { + + if (address->family != AF_INET) + continue; + + if (in_addr_is_null(address->family, &address->in_addr)) + continue; + + return address; + } + + /* 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_configured(Link *link) { + int r; + assert(link); + assert(link->network); assert(link->state == LINK_STATE_SETTING_ROUTES); + if (link_dhcp4_server_enabled(link) && + !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; + } + + log_debug_link(link, "offering DHCPv4 leases"); + + r = sd_dhcp_server_set_address(link->dhcp_server, + &address->in_addr.in, + address->prefixlen); + if (r < 0) + return r; + + /* 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_link(link, "could not start DHCPv4 server " + "instance: %s", strerror(-r)); + + link_enter_failed(link); + + return 0; + } + } + log_info_link(link, "link configured"); link->state = LINK_STATE_CONFIGURED; + link_save(link); + return 0; } -static void link_enter_failed(Link *link) { +void link_client_handler(Link *link) { assert(link); + assert(link->network); - log_warning_link(link, "failed"); + if (!link->static_configured) + return; - link->state = LINK_STATE_FAILED; + if (link_ipv4ll_enabled(link)) + if (!link->ipv4ll_address || + !link->ipv4ll_route) + return; + + if (link_dhcp4_enabled(link) && !link->dhcp4_configured) + return; + + if (link->state != LINK_STATE_CONFIGURED) + link_enter_configured(link); + + return; } static int route_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { - Link *link = userdata; + _cleanup_link_unref_ Link *link = userdata; int r; - assert(link->route_messages > 0); - assert(link->state == LINK_STATE_SETTING_ADDRESSES || - link->state == LINK_STATE_SETTING_ROUTES || - link->state == LINK_STATE_FAILED); + assert(link->link_messages > 0); + assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES, + LINK_STATE_SETTING_ROUTES, LINK_STATE_FAILED, + LINK_STATE_LINGER)); - link->route_messages --; + link->link_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 && r != -EEXIST) - log_warning_link(link, "could not set route: %s", strerror(-r)); + 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) { + if (link->link_messages == 0) { log_debug_link(link, "routes set"); - link_enter_configured(link); + link->static_configured = true; + link_client_handler(link); } return 1; } static int link_enter_set_routes(Link *link) { - Route *route; + Route *rt; int r; assert(link); @@ -187,62 +541,109 @@ static int link_enter_set_routes(Link *link) { link->state = LINK_STATE_SETTING_ROUTES; - if (!link->network->static_routes && !link->dhcp_route) - return link_enter_configured(link); - - log_debug_link(link, "setting routes"); - - LIST_FOREACH(static_routes, route, link->network->static_routes) { - r = route_configure(route, link, &route_handler); + 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)); + "could not set routes: %s", + strerror(-r)); link_enter_failed(link); return r; } - link->route_messages ++; + link->link_messages ++; } - if (link->dhcp_route) { - r = route_configure(link->dhcp_route, link, &route_handler); + if (link->link_messages == 0) { + link->static_configured = true; + link_client_handler(link); + } else + log_debug_link(link, "setting routes"); + + return 0; +} + +int link_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 && 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; +} + +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); + + for (; m; m = sd_rtnl_message_next(m)) { + r = sd_rtnl_message_get_errno(m); if (r < 0) { - log_warning_link(link, - "could not set routes: %s", strerror(-r)); - link_enter_failed(link); - return r; + log_debug_link(link, "getting address failed: %s", + strerror(-r)); + continue; } - link->route_messages ++; + 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 address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { - Link *link = userdata; + _cleanup_link_unref_ Link *link = userdata; int r; + assert(rtnl); assert(m); assert(link); assert(link->ifname); - assert(link->addr_messages > 0); - assert(link->state == LINK_STATE_SETTING_ADDRESSES || link->state == LINK_STATE_FAILED); + assert(link->link_messages > 0); + assert(IN_SET(link->state, LINK_STATE_SETTING_ADDRESSES, + LINK_STATE_FAILED, LINK_STATE_LINGER)); - link->addr_messages --; + link->link_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 && r != -EEXIST) - log_struct_link(LOG_ERR, link, - "MESSAGE=%s: could not set address: %s", + 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); + } - if (link->addr_messages == 0) { + if (link->link_messages == 0) { log_debug_link(link, "addresses set"); link_enter_set_routes(link); } @@ -251,7 +652,7 @@ static int address_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { } static int link_enter_set_addresses(Link *link) { - Address *address; + Address *ad; int r; assert(link); @@ -260,76 +661,136 @@ static int link_enter_set_addresses(Link *link) { link->state = LINK_STATE_SETTING_ADDRESSES; - if (!link->network->static_addresses && !link->dhcp_address) - return link_enter_set_routes(link); - - log_debug_link(link, "setting addresses"); - - LIST_FOREACH(static_addresses, address, link->network->static_addresses) { - r = address_configure(address, link, &address_handler); + 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)); + "could not set addresses: %s", + strerror(-r)); link_enter_failed(link); return r; } - link->addr_messages ++; + link->link_messages ++; } - if (link->dhcp_address) { - r = address_configure(link->dhcp_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 ++; - } + if (link->link_messages == 0) { + link_enter_set_routes(link); + } else + log_debug_link(link, "setting addresses"); return 0; } -static int address_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { - Link *link = userdata; +int link_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 (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 && r != -EEXIST) - log_warning_link(link, "could not drop address: %s", strerror(-r)); - - return 1; + 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; +} + +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) { - Link *link = userdata; + _cleanup_link_unref_ Link *link = userdata; int r; assert(m); assert(link); assert(link->ifname); - 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 && r != -EEXIST) - log_warning_link(link, "Could not set MTU: %s", strerror(-r)); + 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_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL; +int link_set_mtu(Link *link, uint32_t mtu) { + _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL; int r; assert(link); @@ -338,7 +799,8 @@ static int link_set_mtu(Link *link, uint32_t mtu) { log_debug_link(link, "setting MTU: %" PRIu32, mtu); - r = sd_rtnl_message_link_new(RTM_SETLINK, link->ifindex, &req); + 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; @@ -350,167 +812,118 @@ static int link_set_mtu(Link *link, uint32_t mtu) { return r; } - r = sd_rtnl_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL); + 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)); + "Could not send rtnetlink message: %s", + strerror(-r)); return r; } + link_ref(link); + return 0; } -static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) { +static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) { Link *link = userdata; - struct in_addr address; - struct in_addr netmask; - struct in_addr gateway; - int prefixlen; - int r; assert(link); assert(link->network); + assert(link->manager); - if (link->state == LINK_STATE_FAILED) + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) return; - if (event < 0) { - log_warning_link(link, "DHCP error: %s", strerror(-event)); - link_enter_failed(link); + 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; } +} - if (event == DHCP_EVENT_NO_LEASE) - log_debug_link(link, "IP address in use."); +static void icmp6_router_handler(sd_icmp6_nd *nd, int event, void *userdata) { + Link *link = userdata; + int r; - if (event == DHCP_EVENT_IP_CHANGE || event == DHCP_EVENT_EXPIRED || - event == DHCP_EVENT_STOP) { - if (link->dhcp_address) { - address_drop(link->dhcp_address, link, address_drop_handler); + assert(link); + assert(link->network); + assert(link->manager); - address_free(link->dhcp_address); - link->dhcp_address = NULL; - } + if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) + return; - if (link->dhcp_route) { - route_free(link->dhcp_route); - link->dhcp_route = NULL; - } + switch(event) { + case ICMP6_EVENT_ROUTER_ADVERTISMENT_NONE: + case ICMP6_EVENT_ROUTER_ADVERTISMENT_OTHER: + return; - if (link->network->dhcp_mtu) { - uint16_t mtu; + case ICMP6_EVENT_ROUTER_ADVERTISMENT_TIMEOUT: + case ICMP6_EVENT_ROUTER_ADVERTISMENT_MANAGED: + break; - r = sd_dhcp_client_get_mtu(client, &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; - } - } - } - } + default: + if (event < 0) + log_warning_link(link, "ICMPv6 error: %s", + strerror(-event)); + else + log_warning_link(link, "ICMPv6 unknown event: %d", + event); - r = sd_dhcp_client_get_address(client, &address); - if (r < 0) { - log_warning_link(link, "DHCP error: no address"); - link_enter_failed(link); return; } - r = sd_dhcp_client_get_netmask(client, &netmask); + 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) { - log_warning_link(link, "DHCP error: no netmask"); - link_enter_failed(link); + link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); return; } - prefixlen = sd_dhcp_client_prefixlen(&netmask); - if (prefixlen < 0) { - log_warning_link(link, "DHCP error: no prefixlen"); - link_enter_failed(link); + r = sd_dhcp6_client_set_mac(link->dhcp6_client, + (const uint8_t *) &link->mac, + sizeof (link->mac), ARPHRD_ETHER); + if (r < 0) { + link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); return; } - r = sd_dhcp_client_get_router(client, &gateway); + r = sd_dhcp6_client_set_index(link->dhcp6_client, link->ifindex); if (r < 0) { - log_warning_link(link, "DHCP error: no router"); - link_enter_failed(link); + link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client); return; } - if (event == DHCP_EVENT_IP_CHANGE || event == DHCP_EVENT_IP_ACQUIRE) { - _cleanup_address_free_ Address *addr = NULL; - _cleanup_route_free_ Route *rt = NULL; - struct in_addr **nameservers; - - 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); - - r = address_new_dynamic(&addr); - if (r < 0) { - log_error_link(link, "Could not allocate address"); - link_enter_failed(link); - return; - } - - addr->family = AF_INET; - addr->in_addr.in = address; - addr->prefixlen = prefixlen; - addr->netmask = netmask; - - r = route_new_dynamic(&rt); - if (r < 0) { - log_error_link(link, "Could not allocate route"); - link_enter_failed(link); - return; - } - - rt->family = AF_INET; - rt->in_addr.in = gateway; - - link->dhcp_address = addr; - link->dhcp_route = rt; - addr = NULL; - rt = NULL; - - if (link->network->dhcp_dns) { - r = sd_dhcp_client_get_dns(client, &nameservers); - 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_client_get_mtu(client, &mtu); - if (r >= 0) { - r = link_set_mtu(link, mtu); - if (r < 0) - log_error_link(link, "Failed to set MTU " - "to %" PRIu16, mtu); - } - } - - link_enter_set_addresses(link); + 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; } - 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) { @@ -518,118 +931,91 @@ static int link_acquire_conf(Link *link) { assert(link); assert(link->network); - assert(link->network->dhcp); assert(link->manager); assert(link->manager->event); - if (!link->dhcp) { - link->dhcp = sd_dhcp_client_new(link->manager->event); - if (!link->dhcp) - return -ENOMEM; - - r = sd_dhcp_client_set_index(link->dhcp, link->ifindex); - if (r < 0) - return r; + if (link_ipv4ll_enabled(link)) { + assert(link->ipv4ll); - r = sd_dhcp_client_set_mac(link->dhcp, &link->mac); - if (r < 0) - return r; + log_debug_link(link, "acquiring IPv4 link-local address"); - r = sd_dhcp_client_set_callback(link->dhcp, dhcp_handler, link); - if (r < 0) + r = sd_ipv4ll_start(link->ipv4ll); + if (r < 0) { + log_warning_link(link, "could not acquire IPv4 " + "link-local address"); return r; + } } - log_debug_link(link, "acquiring DHCPv4 lease"); + if (link_dhcp4_enabled(link)) { + assert(link->dhcp_client); - if (link->network->dhcp_mtu) { - r = sd_dhcp_client_set_request_option(link->dhcp, 26); - if (r < 0) + 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; + } } - r = sd_dhcp_client_start(link->dhcp); - if (r < 0) - return r; + if (link_dhcp6_enabled(link)) { + assert(link->icmp6_router_discovery); - return 0; -} + log_debug_link(link, "discovering IPv6 routers"); -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) { - log_debug_link(link, "link status unchanged: %#.8x", flags); - return 0; + 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; + } } - if ((link->flags & IFF_UP) != (flags & IFF_UP)) - log_info_link(link, - "power %s", flags & IFF_UP ? "on": "off"); - - 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) { - r = link_acquire_conf(link); - if (r < 0) { - log_warning_link(link, "Could not acquire DHCPv4 lease: %s", strerror(-r)); - link_enter_failed(link); - return r; - } - } - } else { - log_info_link(link, "carrier off"); + return 0; +} - if (link->network->dhcp) { - r = sd_dhcp_client_stop(link->dhcp); - if (r < 0) { - log_warning_link(link, "Could not stop DHCPv4 client: %s", strerror(-r)); - link_enter_failed(link); - return r; - } - } - } - } +bool link_has_carrier(Link *link) { + /* see Documentation/networking/operstates.txt in the kernel sources */ - log_debug_link(link, - "link status updated: %#.8x -> %#.8x", link->flags, flags); + if (link->kernel_operstate == IF_OPER_UP) + return true; - link->flags = flags; + if (link->kernel_operstate == IF_OPER_UNKNOWN) + /* operstate may not be implemented, so fall back to flags */ + if ((link->flags & IFF_LOWER_UP) && !(link->flags & IFF_DORMANT)) + return true; - return 0; + return false; } static int link_up_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { - Link *link = userdata; + _cleanup_link_unref_ Link *link = userdata; int r; assert(link); - 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_link(link, - "could not bring up interface: %s", strerror(-r)); - link_enter_failed(link); + /* 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); } - link_update_flags(link, link->flags | IFF_UP); - return 1; } static int link_up(Link *link) { - _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL; + _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL; int r; assert(link); @@ -638,201 +1024,886 @@ static int link_up(Link *link) { log_debug_link(link, "bringing link up"); - r = sd_rtnl_message_link_new(RTM_SETLINK, link->ifindex, &req); + 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); + 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)); + 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); + 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)); + "Could not send rtnetlink message: %s", + strerror(-r)); return r; } + link_ref(link); + return 0; } -static int link_bridge_joined(Link *link) { +static int link_joined(Link *link) { int r; assert(link); - assert(link->state == LINK_STATE_JOINING_BRIDGE); assert(link->network); - r = link_up(link); - if (r < 0) { - link_enter_failed(link); - return r; + if (!(link->flags & IFF_UP)) { + r = link_up(link); + if (r < 0) { + link_enter_failed(link); + return r; + } } - if (!link->network->dhcp) - return link_enter_set_addresses(link); - - return 0; + return link_enter_set_addresses(link); } -static int bridge_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { - Link *link = userdata; +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(link->state == LINK_STATE_JOINING_BRIDGE || link->state == LINK_STATE_FAILED); assert(link->network); - if (link->state == LINK_STATE_FAILED) + 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) { + if (r < 0 && r != -EEXIST) { log_struct_link(LOG_ERR, link, - "MESSAGE=%s: could not join bridge '%s': %s", - link->ifname, link->network->bridge->name, strerror(-r), - BRIDGE(link->network->bridge), + "MESSAGE=%-*s: could not join netdev: %s", + IFNAMSIZ, + link->ifname, strerror(-r), + "ERRNO=%d", -r, NULL); link_enter_failed(link); return 1; - } + } else + log_debug_link(link, "joined netdev"); - log_struct_link(LOG_DEBUG, link, - "MESSAGE=%s: joined bridge '%s'", - link->network->bridge->name, - BRIDGE(link->network->bridge), - NULL); - - link_bridge_joined(link); + if (link->enslaving <= 0) + link_joined(link); return 1; } -static int link_enter_join_bridge(Link *link) { +static int link_enter_join_netdev(Link *link) { + NetDev *netdev; + Iterator i; int r; assert(link); assert(link->network); - assert(link->state == _LINK_STATE_INVALID); + assert(link->state == LINK_STATE_PENDING); - link->state = LINK_STATE_JOINING_BRIDGE; + link->state = LINK_STATE_ENSLAVING; - if (!link->network->bridge) - return link_bridge_joined(link); + link_save(link); - log_struct_link(LOG_DEBUG, link, - "MESSAGE=%s: joining bridge '%s'", - link->network->bridge->name, - BRIDGE(link->network->bridge), - NULL); - log_debug_link(link, "joining bridge"); + if (!link->network->bridge && + !link->network->bond && + hashmap_isempty(link->network->stacked_netdevs)) + return link_joined(link); - r = bridge_join(link->network->bridge, link, &bridge_handler); - if (r < 0) { - log_struct_link(LOG_WARNING, link, - "MESSAGE=%s: could not join bridge '%s': %s", - link->network->bridge->name, strerror(-r), - BRIDGE(link->network->bridge), + if (link->network->bond) { + log_struct_link(LOG_DEBUG, link, + "MESSAGE=%-*s: enslaving by '%s'", + IFNAMSIZ, + link->ifname, link->network->bond->ifname, + NETDEVIF(link->network->bond), NULL); - link_enter_failed(link); - return r; + + 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), + NETDEVIF(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, + NETDEVIF(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), + NETDEVIF(link->network->bridge), + NULL); + link_enter_failed(link); + return r; + } + + link->enslaving ++; + } + + HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) { + log_struct_link(LOG_DEBUG, link, + "MESSAGE=%-*s: enslaving by '%s'", + IFNAMSIZ, + link->ifname, netdev->ifname, NETDEVIF(netdev), + NULL); + + r = netdev_join(netdev, link, &netdev_join_handler); + if (r < 0) { + log_struct_link(LOG_WARNING, link, + "MESSAGE=%-*s: could not join netdev '%s': %s", + IFNAMSIZ, + link->ifname, netdev->ifname, + strerror(-r), + NETDEVIF(netdev), NULL); + link_enter_failed(link); + return r; + } + + link->enslaving ++; } return 0; } -static int link_get_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) { - Link *link = userdata; +static int link_configure(Link *link) { + int r; + + assert(link); + assert(link->network); + assert(link->state == LINK_STATE_PENDING); + + if (link_ipv4ll_enabled(link)) { + r = ipv4ll_configure(link); + if (r < 0) + return r; + } + + if (link_dhcp4_enabled(link)) { + r = dhcp4_configure(link); + if (r < 0) + return r; + } + + if (link_dhcp4_server_enabled(link)) { + 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 (link_dhcp6_enabled(link)) { + 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)) { + 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_FAILED) + if (link->state != LINK_STATE_PENDING) return 1; - r = sd_rtnl_message_get_errno(m); - if (r < 0) { - log_warning_link(link, "could not get state: %s", strerror(-r)); - link_enter_failed(link); + 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; + + if (link->flags & IFF_LOOPBACK) { + if (network->ipv4ll) + log_debug_link(link, "ignoring IPv4LL for loopback link"); + + if (network->dhcp != DHCP_SUPPORT_NONE) + log_debug_link(link, "ignoring DHCP clients for loopback link"); + + if (network->dhcp_server) + log_debug_link(link, "ignoring DHCP server for loopback link"); } - log_debug_link(link, "got link state"); + r = network_apply(link->manager, network, link); + if (r < 0) + return r; - link_update(link, m); + r = link_configure(link); + if (r < 0) + return r; return 1; } -static int link_get(Link *link) { - _cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL; +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_PENDING) + 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 */ - log_debug_link(link, "requesting link status"); + 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); - r = sd_rtnl_message_link_new(RTM_GETLINK, link->ifindex, &req); + 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]; + char valid_buf[FORMAT_TIMESPAN_MAX]; + const char *valid_str = NULL; + 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_error_link(link, "Could not allocate RTM_GETLINK message"); + 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 (%d), ignoring", ifindex); + 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_call_async(link->manager->rtnl, req, link_get_handler, link, 0, NULL); + r = sd_rtnl_message_addr_get_prefixlen(message, &address->prefixlen); if (r < 0) { - log_error_link(link, - "Could not send rtnetlink message: %s", strerror(-r)); + 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; + } + + r = sd_rtnl_message_addr_get_flags(message, &address->flags); + if (r < 0) { + log_warning_link(link, + "rtnl: received address with invalid flags, 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; + } + + r = sd_rtnl_message_read_cache_info(message, IFA_CACHEINFO, + &address->cinfo); + if (r >= 0) { + if (address->cinfo.ifa_valid == CACHE_INFO_INFINITY_LIFE_TIME) + valid_str = "ever"; + else + valid_str = format_timespan(valid_buf, FORMAT_TIMESPAN_MAX, + address->cinfo.ifa_valid * USEC_PER_SEC, + USEC_PER_SEC); + } + + 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 (valid for %s)", + buf, address->prefixlen, valid_str); + else + log_debug_link(link, "updated address: %s/%u (valid for %s)", + buf, address->prefixlen, valid_str); + + 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 (valid for %s)", + buf, address->prefixlen, valid_str); + + link_save(link); + } else + log_warning_link(link, + "removing non-existent address: %s/%u (valid for %s)", + buf, address->prefixlen, valid_str); + + 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 %d 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%d", link->ifindex); + device = udev_device_new_from_device_id(m->udev, ifindex_str); + if (!device) { + log_warning_link(link, + "could not find udev device: %m"); + return -errno; + } + + if (udev_device_get_is_initialized(device) <= 0) { + /* not yet ready */ + log_debug_link(link, "link pending udev initialization..."); + 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_configure(Link *link) { +int link_update(Link *link, sd_rtnl_message *m) { + struct ether_addr mac; + const char *ifname; + uint32_t mtu; + bool had_carrier, carrier_gained, carrier_lost; int r; assert(link); - assert(link->network); - assert(link->state == _LINK_STATE_INVALID); + assert(link->ifname); + assert(m); - r = link_get(link); - if (r < 0) { - link_enter_failed(link); + 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; + } + + r = sd_rtnl_message_read_u32(m, IFLA_MTU, &mtu); + if (r >= 0 && mtu > 0) { + link->mtu = mtu; + if (!link->original_mtu) { + link->original_mtu = mtu; + log_debug_link(link, "saved original MTU: %" + PRIu32, link->original_mtu); + } + + if (link->dhcp_client) { + r = sd_dhcp_client_set_mtu(link->dhcp_client, + link->mtu); + if (r < 0) { + log_warning_link(link, + "Could not update MTU in DHCP client: %s", + strerror(-r)); + return r; + } + } + } + + /* 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, + (const uint8_t *) &link->mac, + sizeof (link->mac), + ARPHRD_ETHER); + 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, + (const uint8_t *) &link->mac, + sizeof (link->mac), + ARPHRD_ETHER); + if (r < 0) { + log_warning_link(link, + "Could not update MAC address in DHCPv6 client: %s", + strerror(-r)); + return r; + } + } + } + } + + had_carrier = link_has_carrier(link); + + r = link_update_flags(link, m); + if (r < 0) return r; + + carrier_gained = !had_carrier && link_has_carrier(link); + carrier_lost = had_carrier && !link_has_carrier(link); + + 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 link_enter_join_bridge(link); + return 0; } -int link_update(Link *link, sd_rtnl_message *m) { - unsigned flags; - void *data; - uint16_t type; +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)) { + 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->flags & (IFA_F_TENTATIVE | IFA_F_DEPRECATED)) + continue; + + 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 if (link->flags & IFF_UP) + link->operstate = LINK_OPERSTATE_NO_CARRIER; + else + link->operstate = LINK_OPERSTATE_OFF; +} + +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(m); + assert(link->state_file); + assert(link->lease_file); + assert(link->manager); - if (link->state == LINK_STATE_FAILED) - return 0; + link_update_operstate(link); - r = sd_rtnl_message_link_get_flags(m, &flags); - if (r < 0) { - log_warning_link(link, "Could not get link flags"); + r = manager_save(link->manager); + if (r < 0) return r; + + if (link->state == LINK_STATE_LINGER) { + unlink(link->state_file); + return 0; } - while (sd_rtnl_message_read(m, &type, &data) > 0) { - if (type == IFLA_MTU && link->network->dhcp_mtu && !link->original_mtu) { - link->original_mtu = *(uint16_t *) data; - log_debug_link(link, "saved original MTU: %" PRIu16, link->original_mtu); + 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) + return r; + + fchmod(fileno(f), 0644); + + fprintf(f, + "# This is private data. Do not parse.\n" + "ADMIN_STATE=%s\n" + "OPER_STATE=%s\n", + admin_state, oper_state); + + if (link->network) { + char **address, **domain; + bool space; + + fprintf(f, "NETWORK_FILE=%s\n", link->network->filename); + + fputs("DNS=", f); + space = false; + STRV_FOREACH(address, link->network->dns) { + if (space) + fputc(' ', f); + fputs(*address, f); + space = true; } + + if (link->network->dhcp_dns && + link->dhcp_lease) { + const struct in_addr *addresses; + + r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses); + if (r > 0) { + if (space) + fputc(' ', f); + serialize_in_addrs(f, addresses, r); + } + } + + fputs("\n", f); + + fprintf(f, "NTP="); + space = false; + STRV_FOREACH(address, link->network->ntp) { + if (space) + fputc(' ', f); + fputs(*address, f); + space = true; + } + + if (link->network->dhcp_ntp && + link->dhcp_lease) { + const struct in_addr *addresses; + + r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses); + if (r > 0) { + if (space) + fputc(' ', f); + serialize_in_addrs(f, addresses, r); + } + } + + fputs("\n", f); + + fprintf(f, "DOMAINS="); + space = false; + STRV_FOREACH(domain, link->network->domains) { + if (space) + fputc(' ', f); + fputs(*domain, f); + space = true; + } + + if (link->network->dhcp_domains && + link->dhcp_lease) { + const char *domainname; + + r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname); + if (r >= 0) { + if (space) + fputc(' ', f); + fputs(domainname, f); + } + } + + fputs("\n", f); + + fprintf(f, "WILDCARD_DOMAIN=%s\n", + yes_no(link->network->wildcard_domain)); + + fprintf(f, "LLMNR=%s\n", + llmnr_support_to_string(link->network->llmnr)); + } + + if (link->dhcp_lease) { + assert(link->network); + + r = dhcp_lease_save(link->dhcp_lease, link->lease_file); + if (r < 0) + goto fail; + + fprintf(f, + "DHCP_LEASE=%s\n", + link->lease_file); + } else + unlink(link->lease_file); + + r = fflush_and_check(f); + if (r < 0) + goto fail; + + if (rename(temp_path, link->state_file) < 0) { + r = -errno; + goto fail; } - return link_update_flags(link, flags); + return 0; +fail: + log_error_link(link, "Failed to save link data to %s: %s", link->state_file, strerror(-r)); + unlink(link->state_file); + unlink(temp_path); + return r; } + +static const char* const link_state_table[_LINK_STATE_MAX] = { + [LINK_STATE_PENDING] = "pending", + [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_OFF] = "off", + [LINK_OPERSTATE_NO_CARRIER] = "no-carrier", + [LINK_OPERSTATE_DORMANT] = "dormant", + [LINK_OPERSTATE_CARRIER] = "carrier", + [LINK_OPERSTATE_DEGRADED] = "degraded", + [LINK_OPERSTATE_ROUTABLE] = "routable", +}; + +DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);