/* SPDX-License-Identifier: LGPL-2.1-or-later */ /*** Copyright © 2014-2015 Intel Corporation. All rights reserved. ***/ #include #include #include #include #include "sd-dhcp6-client.h" #include "alloc-util.h" #include "dhcp-identifier.h" #include "dhcp6-internal.h" #include "dhcp6-lease-internal.h" #include "dhcp6-protocol.h" #include "dns-domain.h" #include "event-util.h" #include "fd-util.h" #include "hexdecoct.h" #include "hostname-util.h" #include "in-addr-util.h" #include "io-util.h" #include "network-common.h" #include "random-util.h" #include "socket-util.h" #include "string-table.h" #include "strv.h" #include "util.h" #include "web-util.h" #define MAX_MAC_ADDR_LEN INFINIBAND_ALEN #define IRT_DEFAULT (1 * USEC_PER_DAY) #define IRT_MINIMUM (600 * USEC_PER_SEC) /* what to request from the server, addresses (IA_NA) and/or prefixes (IA_PD) */ typedef enum DHCP6RequestIA { DHCP6_REQUEST_IA_NA = 1 << 0, DHCP6_REQUEST_IA_TA = 1 << 1, /* currently not used */ DHCP6_REQUEST_IA_PD = 1 << 2, } DHCP6RequestIA; struct sd_dhcp6_client { unsigned n_ref; DHCP6State state; sd_event *event; int event_priority; int ifindex; char *ifname; DHCP6Address hint_pd_prefix; struct in6_addr local_address; uint8_t mac_addr[MAX_MAC_ADDR_LEN]; size_t mac_addr_len; uint16_t arp_type; DHCP6IA ia_na; DHCP6IA ia_pd; sd_event_source *timeout_t1; sd_event_source *timeout_t2; DHCP6RequestIA request_ia; be32_t transaction_id; usec_t transaction_start; struct sd_dhcp6_lease *lease; int fd; bool information_request; bool iaid_set; be16_t *req_opts; size_t req_opts_len; char *fqdn; char *mudurl; char **user_class; char **vendor_class; sd_event_source *receive_message; usec_t retransmit_time; uint8_t retransmit_count; sd_event_source *timeout_resend; sd_event_source *timeout_resend_expire; sd_dhcp6_client_callback_t callback; void *userdata; struct duid duid; size_t duid_len; usec_t information_request_time_usec; usec_t information_refresh_time_usec; OrderedHashmap *extra_options; OrderedHashmap *vendor_options; /* Ignore ifindex when generating iaid. See dhcp_identifier_set_iaid(). */ bool test_mode; }; static const uint16_t default_req_opts[] = { SD_DHCP6_OPTION_DNS_SERVERS, SD_DHCP6_OPTION_DOMAIN_LIST, SD_DHCP6_OPTION_NTP_SERVER, SD_DHCP6_OPTION_SNTP_SERVERS, }; const char * dhcp6_message_type_table[_DHCP6_MESSAGE_TYPE_MAX] = { [DHCP6_MESSAGE_SOLICIT] = "Solicit", [DHCP6_MESSAGE_ADVERTISE] = "Advertise", [DHCP6_MESSAGE_REQUEST] = "Request", [DHCP6_MESSAGE_CONFIRM] = "Confirm", [DHCP6_MESSAGE_RENEW] = "Renew", [DHCP6_MESSAGE_REBIND] = "Rebind", [DHCP6_MESSAGE_REPLY] = "Reply", [DHCP6_MESSAGE_RELEASE] = "Release", [DHCP6_MESSAGE_DECLINE] = "Decline", [DHCP6_MESSAGE_RECONFIGURE] = "Reconfigure", [DHCP6_MESSAGE_INFORMATION_REQUEST] = "Information Request", [DHCP6_MESSAGE_RELAY_FORWARD] = "Relay Forward", [DHCP6_MESSAGE_RELAY_REPLY] = "Relay Reply", [DHCP6_MESSAGE_LEASE_QUERY] = "Lease Query", [DHCP6_MESSAGE_LEASE_QUERY_REPLY] = "Lease Query Reply", [DHCP6_MESSAGE_LEASE_QUERY_DONE] = "Lease Query Done", [DHCP6_MESSAGE_LEASE_QUERY_DATA] = "Lease Query Data", [DHCP6_MESSAGE_RECONFIGURE_REQUEST] = "Reconfigure Request", [DHCP6_MESSAGE_RECONFIGURE_REPLY] = "Reconfigure Reply", [DHCP6_MESSAGE_DHCPV4_QUERY] = "DHCPv4 Query", [DHCP6_MESSAGE_DHCPV4_RESPONSE] = "DHCPv4 Response", [DHCP6_MESSAGE_ACTIVE_LEASE_QUERY] = "Active Lease Query", [DHCP6_MESSAGE_START_TLS] = "Start TLS", [DHCP6_MESSAGE_BINDING_UPDATE] = "Binding Update", [DHCP6_MESSAGE_BINDING_REPLY] = "Binding Reply", [DHCP6_MESSAGE_POOL_REQUEST] = "Pool Request", [DHCP6_MESSAGE_POOL_RESPONSE] = "Pool Response", [DHCP6_MESSAGE_UPDATE_REQUEST] = "Update Request", [DHCP6_MESSAGE_UPDATE_REQUEST_ALL] = "Update Request All", [DHCP6_MESSAGE_UPDATE_DONE] = "Update Done", [DHCP6_MESSAGE_CONNECT] = "Connect", [DHCP6_MESSAGE_CONNECT_REPLY] = "Connect Reply", [DHCP6_MESSAGE_DISCONNECT] = "Disconnect", [DHCP6_MESSAGE_STATE] = "State", [DHCP6_MESSAGE_CONTACT] = "Contact", }; DEFINE_STRING_TABLE_LOOKUP(dhcp6_message_type, int); const char * dhcp6_message_status_table[_DHCP6_STATUS_MAX] = { [DHCP6_STATUS_SUCCESS] = "Success", [DHCP6_STATUS_UNSPEC_FAIL] = "Unspecified failure", [DHCP6_STATUS_NO_ADDRS_AVAIL] = "No addresses available", [DHCP6_STATUS_NO_BINDING] = "Binding unavailable", [DHCP6_STATUS_NOT_ON_LINK] = "Not on link", [DHCP6_STATUS_USE_MULTICAST] = "Use multicast", [DHCP6_STATUS_NO_PREFIX_AVAIL] = "No prefix available", [DHCP6_STATUS_UNKNOWN_QUERY_TYPE] = "Unknown query type", [DHCP6_STATUS_MALFORMED_QUERY] = "Malformed query", [DHCP6_STATUS_NOT_CONFIGURED] = "Not configured", [DHCP6_STATUS_NOT_ALLOWED] = "Not allowed", [DHCP6_STATUS_QUERY_TERMINATED] = "Query terminated", [DHCP6_STATUS_DATA_MISSING] = "Data missing", [DHCP6_STATUS_CATCHUP_COMPLETE] = "Catch up complete", [DHCP6_STATUS_NOT_SUPPORTED] = "Not supported", [DHCP6_STATUS_TLS_CONNECTION_REFUSED] = "TLS connection refused", [DHCP6_STATUS_ADDRESS_IN_USE] = "Address in use", [DHCP6_STATUS_CONFIGURATION_CONFLICT] = "Configuration conflict", [DHCP6_STATUS_MISSING_BINDING_INFORMATION] = "Missing binding information", [DHCP6_STATUS_OUTDATED_BINDING_INFORMATION] = "Outdated binding information", [DHCP6_STATUS_SERVER_SHUTTING_DOWN] = "Server shutting down", [DHCP6_STATUS_DNS_UPDATE_NOT_SUPPORTED] = "DNS update not supported", [DHCP6_STATUS_EXCESSIVE_TIME_SKEW] = "Excessive time skew", }; DEFINE_STRING_TABLE_LOOKUP(dhcp6_message_status, int); #define DHCP6_CLIENT_DONT_DESTROY(client) \ _cleanup_(sd_dhcp6_client_unrefp) _unused_ sd_dhcp6_client *_dont_destroy_##client = sd_dhcp6_client_ref(client) static int client_start(sd_dhcp6_client *client, DHCP6State state); int sd_dhcp6_client_set_callback( sd_dhcp6_client *client, sd_dhcp6_client_callback_t cb, void *userdata) { assert_return(client, -EINVAL); client->callback = cb; client->userdata = userdata; return 0; } int sd_dhcp6_client_set_ifindex(sd_dhcp6_client *client, int ifindex) { assert_return(client, -EINVAL); assert_return(ifindex > 0, -EINVAL); assert_return(client->state == DHCP6_STATE_STOPPED, -EBUSY); client->ifindex = ifindex; return 0; } int sd_dhcp6_client_set_ifname(sd_dhcp6_client *client, const char *ifname) { assert_return(client, -EINVAL); assert_return(ifname, -EINVAL); if (!ifname_valid_full(ifname, IFNAME_VALID_ALTERNATIVE)) return -EINVAL; return free_and_strdup(&client->ifname, ifname); } int sd_dhcp6_client_get_ifname(sd_dhcp6_client *client, const char **ret) { int r; assert_return(client, -EINVAL); r = get_ifname(client->ifindex, &client->ifname); if (r < 0) return r; if (ret) *ret = client->ifname; return 0; } int sd_dhcp6_client_set_local_address( sd_dhcp6_client *client, const struct in6_addr *local_address) { assert_return(client, -EINVAL); assert_return(local_address, -EINVAL); assert_return(in6_addr_is_link_local(local_address) > 0, -EINVAL); assert_return(client->state == DHCP6_STATE_STOPPED, -EBUSY); client->local_address = *local_address; return 0; } int sd_dhcp6_client_set_mac( sd_dhcp6_client *client, const uint8_t *addr, size_t addr_len, uint16_t arp_type) { assert_return(client, -EINVAL); assert_return(addr, -EINVAL); assert_return(addr_len <= MAX_MAC_ADDR_LEN, -EINVAL); assert_return(client->state == DHCP6_STATE_STOPPED, -EBUSY); if (arp_type == ARPHRD_ETHER) assert_return(addr_len == ETH_ALEN, -EINVAL); else if (arp_type == ARPHRD_INFINIBAND) assert_return(addr_len == INFINIBAND_ALEN, -EINVAL); else { client->arp_type = ARPHRD_NONE; client->mac_addr_len = 0; return 0; } memcpy(&client->mac_addr, addr, addr_len); client->mac_addr_len = addr_len; client->arp_type = arp_type; return 0; } int sd_dhcp6_client_set_prefix_delegation_hint( sd_dhcp6_client *client, uint8_t prefixlen, const struct in6_addr *pd_address) { assert_return(client, -EINVAL); assert_return(pd_address, -EINVAL); assert_return(client->state == DHCP6_STATE_STOPPED, -EBUSY); client->hint_pd_prefix.iapdprefix.address = *pd_address; client->hint_pd_prefix.iapdprefix.prefixlen = prefixlen; return 0; } int sd_dhcp6_client_add_vendor_option(sd_dhcp6_client *client, sd_dhcp6_option *v) { int r; assert_return(client, -EINVAL); assert_return(v, -EINVAL); r = ordered_hashmap_ensure_put(&client->vendor_options, &dhcp6_option_hash_ops, v, v); if (r < 0) return r; sd_dhcp6_option_ref(v); return 1; } static int client_ensure_duid(sd_dhcp6_client *client) { if (client->duid_len != 0) return 0; return dhcp_identifier_set_duid_en(&client->duid, &client->duid_len); } /** * Sets DUID. If duid is non-null, the DUID is set to duid_type + duid * without further modification. Otherwise, if duid_type is supported, DUID * is set based on that type. Otherwise, an error is returned. */ static int dhcp6_client_set_duid_internal( sd_dhcp6_client *client, uint16_t duid_type, const void *duid, size_t duid_len, usec_t llt_time) { int r; assert_return(client, -EINVAL); assert_return(duid_len == 0 || duid != NULL, -EINVAL); assert_return(client->state == DHCP6_STATE_STOPPED, -EBUSY); if (duid) { r = dhcp_validate_duid_len(duid_type, duid_len, true); if (r < 0) { r = dhcp_validate_duid_len(duid_type, duid_len, false); if (r < 0) return log_dhcp6_client_errno(client, r, "Failed to validate length of DUID: %m"); log_dhcp6_client(client, "Using DUID of type %u of incorrect length, proceeding.", duid_type); } client->duid.type = htobe16(duid_type); memcpy(&client->duid.raw.data, duid, duid_len); client->duid_len = sizeof(client->duid.type) + duid_len; } else switch (duid_type) { case DUID_TYPE_LLT: if (client->mac_addr_len == 0) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EOPNOTSUPP), "Failed to set DUID-LLT, MAC address is not set."); r = dhcp_identifier_set_duid_llt(&client->duid, llt_time, client->mac_addr, client->mac_addr_len, client->arp_type, &client->duid_len); if (r < 0) return log_dhcp6_client_errno(client, r, "Failed to set DUID-LLT: %m"); break; case DUID_TYPE_EN: r = dhcp_identifier_set_duid_en(&client->duid, &client->duid_len); if (r < 0) return log_dhcp6_client_errno(client, r, "Failed to set DUID-EN: %m"); break; case DUID_TYPE_LL: if (client->mac_addr_len == 0) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EOPNOTSUPP), "Failed to set DUID-LL, MAC address is not set."); r = dhcp_identifier_set_duid_ll(&client->duid, client->mac_addr, client->mac_addr_len, client->arp_type, &client->duid_len); if (r < 0) return log_dhcp6_client_errno(client, r, "Failed to set DUID-LL: %m"); break; case DUID_TYPE_UUID: r = dhcp_identifier_set_duid_uuid(&client->duid, &client->duid_len); if (r < 0) return log_dhcp6_client_errno(client, r, "Failed to set DUID-UUID: %m"); break; default: return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "Invalid DUID type"); } return 0; } int sd_dhcp6_client_set_duid( sd_dhcp6_client *client, uint16_t duid_type, const void *duid, size_t duid_len) { return dhcp6_client_set_duid_internal(client, duid_type, duid, duid_len, 0); } int sd_dhcp6_client_set_duid_llt( sd_dhcp6_client *client, usec_t llt_time) { return dhcp6_client_set_duid_internal(client, DUID_TYPE_LLT, NULL, 0, llt_time); } static const char* const dhcp6_duid_type_table[_DUID_TYPE_MAX] = { [DUID_TYPE_LLT] = "DUID-LLT", [DUID_TYPE_EN] = "DUID-EN/Vendor", [DUID_TYPE_LL] = "DUID-LL", [DUID_TYPE_UUID] = "UUID", }; DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(dhcp6_duid_type, DUIDType); int sd_dhcp6_client_duid_as_string( sd_dhcp6_client *client, char **duid) { _cleanup_free_ char *p = NULL, *s = NULL, *t = NULL; const char *v; int r; assert_return(client, -EINVAL); assert_return(client->duid_len > 0, -ENODATA); assert_return(duid, -EINVAL); v = dhcp6_duid_type_to_string(be16toh(client->duid.type)); if (v) { s = strdup(v); if (!s) return -ENOMEM; } else { r = asprintf(&s, "%0x", client->duid.type); if (r < 0) return -ENOMEM; } t = hexmem(&client->duid.raw.data, client->duid_len); if (!t) return -ENOMEM; p = strjoin(s, ":", t); if (!p) return -ENOMEM; *duid = TAKE_PTR(p); return 0; } int sd_dhcp6_client_set_iaid(sd_dhcp6_client *client, uint32_t iaid) { assert_return(client, -EINVAL); assert_return(client->state == DHCP6_STATE_STOPPED, -EBUSY); client->ia_na.header.id = htobe32(iaid); client->ia_pd.header.id = htobe32(iaid); client->iaid_set = true; return 0; } void dhcp6_client_set_test_mode(sd_dhcp6_client *client, bool test_mode) { assert(client); client->test_mode = test_mode; } int sd_dhcp6_client_get_iaid(sd_dhcp6_client *client, uint32_t *iaid) { assert_return(client, -EINVAL); assert_return(iaid, -EINVAL); if (!client->iaid_set) return -ENODATA; *iaid = be32toh(client->ia_na.header.id); return 0; } int sd_dhcp6_client_set_fqdn( sd_dhcp6_client *client, const char *fqdn) { assert_return(client, -EINVAL); /* Make sure FQDN qualifies as DNS and as Linux hostname */ if (fqdn && !(hostname_is_valid(fqdn, 0) && dns_name_is_valid(fqdn) > 0)) return -EINVAL; return free_and_strdup(&client->fqdn, fqdn); } int sd_dhcp6_client_set_information_request(sd_dhcp6_client *client, int enabled) { assert_return(client, -EINVAL); assert_return(client->state == DHCP6_STATE_STOPPED, -EBUSY); client->information_request = enabled; return 0; } int sd_dhcp6_client_get_information_request(sd_dhcp6_client *client, int *enabled) { assert_return(client, -EINVAL); assert_return(enabled, -EINVAL); *enabled = client->information_request; return 0; } int sd_dhcp6_client_set_request_option(sd_dhcp6_client *client, uint16_t option) { size_t t; assert_return(client, -EINVAL); assert_return(client->state == DHCP6_STATE_STOPPED, -EBUSY); if (!dhcp6_option_can_request(option)) return -EINVAL; for (t = 0; t < client->req_opts_len; t++) if (client->req_opts[t] == htobe16(option)) return -EEXIST; if (!GREEDY_REALLOC(client->req_opts, client->req_opts_len + 1)) return -ENOMEM; client->req_opts[client->req_opts_len++] = htobe16(option); return 0; } int sd_dhcp6_client_set_request_mud_url(sd_dhcp6_client *client, const char *mudurl) { assert_return(client, -EINVAL); assert_return(client->state == DHCP6_STATE_STOPPED, -EBUSY); assert_return(mudurl, -EINVAL); assert_return(strlen(mudurl) <= UINT8_MAX, -EINVAL); assert_return(http_url_is_valid(mudurl), -EINVAL); return free_and_strdup(&client->mudurl, mudurl); } int sd_dhcp6_client_set_request_user_class(sd_dhcp6_client *client, char * const *user_class) { char * const *p; char **s; assert_return(client, -EINVAL); assert_return(client->state == DHCP6_STATE_STOPPED, -EBUSY); assert_return(!strv_isempty(user_class), -EINVAL); STRV_FOREACH(p, user_class) { size_t len = strlen(*p); if (len > UINT16_MAX || len == 0) return -EINVAL; } s = strv_copy(user_class); if (!s) return -ENOMEM; return strv_free_and_replace(client->user_class, s); } int sd_dhcp6_client_set_request_vendor_class(sd_dhcp6_client *client, char * const *vendor_class) { char * const *p; char **s; assert_return(client, -EINVAL); assert_return(client->state == DHCP6_STATE_STOPPED, -EBUSY); assert_return(!strv_isempty(vendor_class), -EINVAL); STRV_FOREACH(p, vendor_class) { size_t len = strlen(*p); if (len > UINT16_MAX || len == 0) return -EINVAL; } s = strv_copy(vendor_class); if (!s) return -ENOMEM; return strv_free_and_replace(client->vendor_class, s); } int sd_dhcp6_client_get_prefix_delegation(sd_dhcp6_client *client, int *delegation) { assert_return(client, -EINVAL); assert_return(delegation, -EINVAL); *delegation = FLAGS_SET(client->request_ia, DHCP6_REQUEST_IA_PD); return 0; } int sd_dhcp6_client_set_prefix_delegation(sd_dhcp6_client *client, int delegation) { assert_return(client, -EINVAL); SET_FLAG(client->request_ia, DHCP6_REQUEST_IA_PD, delegation); return 0; } int sd_dhcp6_client_get_address_request(sd_dhcp6_client *client, int *request) { assert_return(client, -EINVAL); assert_return(request, -EINVAL); *request = FLAGS_SET(client->request_ia, DHCP6_REQUEST_IA_NA); return 0; } int sd_dhcp6_client_set_address_request(sd_dhcp6_client *client, int request) { assert_return(client, -EINVAL); SET_FLAG(client->request_ia, DHCP6_REQUEST_IA_NA, request); return 0; } int sd_dhcp6_client_set_transaction_id(sd_dhcp6_client *client, uint32_t transaction_id) { assert_return(client, -EINVAL); client->transaction_id = transaction_id; return 0; } int sd_dhcp6_client_get_lease(sd_dhcp6_client *client, sd_dhcp6_lease **ret) { assert_return(client, -EINVAL); if (!client->lease) return -ENOMSG; if (ret) *ret = client->lease; return 0; } int sd_dhcp6_client_add_option(sd_dhcp6_client *client, sd_dhcp6_option *v) { int r; assert_return(client, -EINVAL); assert_return(v, -EINVAL); r = ordered_hashmap_ensure_put(&client->extra_options, &dhcp6_option_hash_ops, UINT_TO_PTR(v->option), v); if (r < 0) return r; sd_dhcp6_option_ref(v); return 0; } static void client_notify(sd_dhcp6_client *client, int event) { assert(client); if (client->callback) client->callback(client, event, client->userdata); } static int client_reset(sd_dhcp6_client *client) { assert(client); client->lease = sd_dhcp6_lease_unref(client->lease); client->receive_message = sd_event_source_unref(client->receive_message); client->transaction_id = 0; client->transaction_start = 0; client->retransmit_time = 0; client->retransmit_count = 0; (void) event_source_disable(client->timeout_resend); (void) event_source_disable(client->timeout_resend_expire); (void) event_source_disable(client->timeout_t1); (void) event_source_disable(client->timeout_t2); client->state = DHCP6_STATE_STOPPED; return 0; } static void client_stop(sd_dhcp6_client *client, int error) { DHCP6_CLIENT_DONT_DESTROY(client); assert(client); client_notify(client, error); client_reset(client); } static int client_append_common_options_in_managed_mode( sd_dhcp6_client *client, uint8_t **opt, size_t *optlen, const DHCP6IA *ia_na, const DHCP6IA *ia_pd, const DHCP6Address *hint_pd_prefix) { int r; assert(client); assert(IN_SET(client->state, DHCP6_STATE_SOLICITATION, DHCP6_STATE_REQUEST, DHCP6_STATE_RENEW, DHCP6_STATE_REBIND)); assert(opt); assert(optlen); if (FLAGS_SET(client->request_ia, DHCP6_REQUEST_IA_NA) && ia_na) { r = dhcp6_option_append_ia(opt, optlen, ia_na); if (r < 0) return r; } if (FLAGS_SET(client->request_ia, DHCP6_REQUEST_IA_PD) && ia_pd) { r = dhcp6_option_append_pd(opt, optlen, ia_pd, hint_pd_prefix); if (r < 0) return r; } if (client->fqdn) { r = dhcp6_option_append_fqdn(opt, optlen, client->fqdn); if (r < 0) return r; } if (client->user_class) { r = dhcp6_option_append_user_class(opt, optlen, client->user_class); if (r < 0) return r; } if (client->vendor_class) { r = dhcp6_option_append_vendor_class(opt, optlen, client->vendor_class); if (r < 0) return r; } if (!ordered_hashmap_isempty(client->vendor_options)) { r = dhcp6_option_append_vendor_option(opt, optlen, client->vendor_options); if (r < 0) return r; } return 0; } static DHCP6MessageType client_message_type_from_state(sd_dhcp6_client *client) { assert(client); switch (client->state) { case DHCP6_STATE_INFORMATION_REQUEST: return DHCP6_MESSAGE_INFORMATION_REQUEST; case DHCP6_STATE_SOLICITATION: return DHCP6_MESSAGE_SOLICIT; case DHCP6_STATE_REQUEST: return DHCP6_MESSAGE_REQUEST; case DHCP6_STATE_RENEW: return DHCP6_MESSAGE_RENEW; case DHCP6_STATE_REBIND: return DHCP6_MESSAGE_REBIND; default: return -EINVAL; } } static int client_send_message(sd_dhcp6_client *client, usec_t time_now) { _cleanup_free_ DHCP6Message *message = NULL; struct in6_addr all_servers = IN6ADDR_ALL_DHCP6_RELAY_AGENTS_AND_SERVERS_INIT; DHCP6MessageType message_type; struct sd_dhcp6_option *j; size_t len, optlen = 512; uint8_t *opt; usec_t elapsed_usec; be16_t elapsed_time; int r; assert(client); len = sizeof(DHCP6Message) + optlen; message = malloc0(len); if (!message) return -ENOMEM; opt = (uint8_t *)(message + 1); message->transaction_id = client->transaction_id; message_type = client_message_type_from_state(client); if (message_type < 0) return message_type; message->type = message_type; switch (client->state) { case DHCP6_STATE_INFORMATION_REQUEST: break; case DHCP6_STATE_SOLICITATION: r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_RAPID_COMMIT, 0, NULL); if (r < 0) return r; r = client_append_common_options_in_managed_mode(client, &opt, &optlen, &client->ia_na, &client->ia_pd, &client->hint_pd_prefix); if (r < 0) return r; break; case DHCP6_STATE_REQUEST: case DHCP6_STATE_RENEW: r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_SERVERID, client->lease->serverid_len, client->lease->serverid); if (r < 0) return r; _fallthrough_; case DHCP6_STATE_REBIND: assert(client->lease); r = client_append_common_options_in_managed_mode(client, &opt, &optlen, client->lease->ia_na.addresses ? &client->lease->ia_na : NULL, client->lease->ia_pd.addresses ? &client->lease->ia_pd : NULL, NULL); if (r < 0) return r; break; case DHCP6_STATE_STOPPED: case DHCP6_STATE_BOUND: return -EINVAL; default: assert_not_reached(); } if (client->mudurl) { r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_MUD_URL_V6, strlen(client->mudurl), client->mudurl); if (r < 0) return r; } r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_ORO, client->req_opts_len * sizeof(be16_t), client->req_opts); if (r < 0) return r; assert(client->duid_len); r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_CLIENTID, client->duid_len, &client->duid); if (r < 0) return r; /* RFC 8415 Section 21.9. * A client MUST include an Elapsed Time option in messages to indicate how long the client has * been trying to complete a DHCP message exchange. */ elapsed_usec = MIN(usec_sub_unsigned(time_now, client->transaction_start) / USEC_PER_MSEC / 10, (usec_t) UINT16_MAX); elapsed_time = htobe16(elapsed_usec); r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_ELAPSED_TIME, sizeof(elapsed_time), &elapsed_time); if (r < 0) return r; ORDERED_HASHMAP_FOREACH(j, client->extra_options) { r = dhcp6_option_append(&opt, &optlen, j->option, j->length, j->data); if (r < 0) return r; } r = dhcp6_network_send_udp_socket(client->fd, &all_servers, message, len - optlen); if (r < 0) return r; log_dhcp6_client(client, "Sent %s", dhcp6_message_type_to_string(message->type)); return 0; } static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) { sd_dhcp6_client *client = userdata; assert(s); assert(client); assert(client->lease); (void) event_source_disable(client->timeout_t2); log_dhcp6_client(client, "Timeout T2"); client_start(client, DHCP6_STATE_REBIND); return 0; } static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) { sd_dhcp6_client *client = userdata; assert(s); assert(client); assert(client->lease); (void) event_source_disable(client->timeout_t1); log_dhcp6_client(client, "Timeout T1"); client_start(client, DHCP6_STATE_RENEW); return 0; } static int client_timeout_resend_expire(sd_event_source *s, uint64_t usec, void *userdata) { sd_dhcp6_client *client = userdata; DHCP6_CLIENT_DONT_DESTROY(client); DHCP6State state; assert(s); assert(client); assert(client->event); state = client->state; client_stop(client, SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE); /* RFC 3315, section 18.1.4., says that "...the client may choose to use a Solicit message to locate a new DHCP server..." */ if (state == DHCP6_STATE_REBIND) client_start(client, DHCP6_STATE_SOLICITATION); return 0; } static usec_t client_timeout_compute_random(usec_t val) { return val - (random_u32() % USEC_PER_SEC) * val / 10 / USEC_PER_SEC; } static int client_timeout_resend(sd_event_source *s, uint64_t usec, void *userdata) { int r = 0; sd_dhcp6_client *client = userdata; usec_t time_now, init_retransmit_time = 0, max_retransmit_time = 0; usec_t max_retransmit_duration = 0; uint8_t max_retransmit_count = 0; assert(s); assert(client); assert(client->event); (void) event_source_disable(client->timeout_resend); switch (client->state) { case DHCP6_STATE_INFORMATION_REQUEST: init_retransmit_time = DHCP6_INF_TIMEOUT; max_retransmit_time = DHCP6_INF_MAX_RT; break; case DHCP6_STATE_SOLICITATION: if (client->retransmit_count > 0 && client->lease) { client_start(client, DHCP6_STATE_REQUEST); return 0; } init_retransmit_time = DHCP6_SOL_TIMEOUT; max_retransmit_time = DHCP6_SOL_MAX_RT; break; case DHCP6_STATE_REQUEST: init_retransmit_time = DHCP6_REQ_TIMEOUT; max_retransmit_time = DHCP6_REQ_MAX_RT; max_retransmit_count = DHCP6_REQ_MAX_RC; break; case DHCP6_STATE_RENEW: init_retransmit_time = DHCP6_REN_TIMEOUT; max_retransmit_time = DHCP6_REN_MAX_RT; /* RFC 3315, section 18.1.3. says max retransmit duration will be the remaining time until T2. Instead of setting MRD, wait for T2 to trigger with the same end result */ break; case DHCP6_STATE_REBIND: init_retransmit_time = DHCP6_REB_TIMEOUT; max_retransmit_time = DHCP6_REB_MAX_RT; if (event_source_is_enabled(client->timeout_resend_expire) <= 0) { uint32_t expire = 0; r = dhcp6_lease_ia_rebind_expire(&client->lease->ia_na, &expire); if (r < 0) { client_stop(client, r); return 0; } max_retransmit_duration = expire * USEC_PER_SEC; } break; case DHCP6_STATE_STOPPED: case DHCP6_STATE_BOUND: return 0; default: assert_not_reached(); } if (max_retransmit_count > 0 && client->retransmit_count >= max_retransmit_count) { client_stop(client, SD_DHCP6_CLIENT_EVENT_RETRANS_MAX); return 0; } r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); if (r < 0) goto error; r = client_send_message(client, time_now); if (r >= 0) client->retransmit_count++; if (client->retransmit_time == 0) { client->retransmit_time = client_timeout_compute_random(init_retransmit_time); if (client->state == DHCP6_STATE_SOLICITATION) client->retransmit_time += init_retransmit_time / 10; } else { assert(max_retransmit_time > 0); if (client->retransmit_time > max_retransmit_time / 2) client->retransmit_time = client_timeout_compute_random(max_retransmit_time); else client->retransmit_time += client_timeout_compute_random(client->retransmit_time); } log_dhcp6_client(client, "Next retransmission in %s", FORMAT_TIMESPAN(client->retransmit_time, USEC_PER_SEC)); r = event_reset_time(client->event, &client->timeout_resend, clock_boottime_or_monotonic(), time_now + client->retransmit_time, 10 * USEC_PER_MSEC, client_timeout_resend, client, client->event_priority, "dhcp6-resend-timer", true); if (r < 0) goto error; if (max_retransmit_duration > 0 && event_source_is_enabled(client->timeout_resend_expire) <= 0) { log_dhcp6_client(client, "Max retransmission duration %"PRIu64" secs", max_retransmit_duration / USEC_PER_SEC); r = event_reset_time(client->event, &client->timeout_resend_expire, clock_boottime_or_monotonic(), time_now + max_retransmit_duration, USEC_PER_SEC, client_timeout_resend_expire, client, client->event_priority, "dhcp6-resend-expire-timer", true); if (r < 0) goto error; } error: if (r < 0) client_stop(client, r); return 0; } static int client_ensure_iaid(sd_dhcp6_client *client) { int r; uint32_t iaid; assert(client); if (client->iaid_set) return 0; r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, client->mac_addr_len, /* legacy_unstable_byteorder = */ true, /* use_mac = */ client->test_mode, &iaid); if (r < 0) return r; client->ia_na.header.id = iaid; client->ia_pd.header.id = iaid; client->iaid_set = true; return 0; } int client_parse_message( sd_dhcp6_client *client, DHCP6Message *message, size_t len, sd_dhcp6_lease *lease) { uint32_t lt_t1 = UINT32_MAX, lt_t2 = UINT32_MAX; usec_t irt = IRT_DEFAULT; int r; assert(client); assert(message); assert(len >= sizeof(DHCP6Message)); assert(lease); len -= sizeof(DHCP6Message); for (size_t offset = 0; offset < len;) { uint16_t optcode; size_t optlen; const uint8_t *optval; r = dhcp6_option_parse(message->options, len, &offset, &optcode, &optlen, &optval); if (r < 0) return r; switch (optcode) { case SD_DHCP6_OPTION_CLIENTID: if (dhcp6_lease_get_clientid(lease, NULL, NULL) >= 0) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "%s contains multiple client IDs", dhcp6_message_type_to_string(message->type)); r = dhcp6_lease_set_clientid(lease, optval, optlen); if (r < 0) return r; break; case SD_DHCP6_OPTION_SERVERID: if (dhcp6_lease_get_serverid(lease, NULL, NULL) >= 0) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "%s contains multiple server IDs", dhcp6_message_type_to_string(message->type)); r = dhcp6_lease_set_serverid(lease, optval, optlen); if (r < 0) return r; break; case SD_DHCP6_OPTION_PREFERENCE: if (optlen != 1) return -EINVAL; r = dhcp6_lease_set_preference(lease, optval[0]); if (r < 0) return r; break; case SD_DHCP6_OPTION_STATUS_CODE: { _cleanup_free_ char *msg = NULL; r = dhcp6_option_parse_status(optval, optlen, &msg); if (r < 0) return r; if (r > 0) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "Received %s message with non-zero status: %s%s%s", dhcp6_message_type_to_string(message->type), strempty(msg), isempty(msg) ? "" : ": ", dhcp6_message_status_to_string(r)); break; } case SD_DHCP6_OPTION_IA_NA: { _cleanup_(dhcp6_lease_free_ia) DHCP6IA ia = {}; if (client->state == DHCP6_STATE_INFORMATION_REQUEST) { log_dhcp6_client(client, "Ignoring IA NA option in information requesting mode."); break; } r = dhcp6_option_parse_ia(client, client->ia_na.header.id, optcode, optlen, optval, &ia); if (r == -ENOMEM) return r; if (r < 0) continue; if (lease->ia_na.addresses) { log_dhcp6_client(client, "Received duplicate matching IA_NA option, ignoring."); continue; } lease->ia_na = ia; ia = (DHCP6IA) {}; lt_t1 = MIN(lt_t1, be32toh(lease->ia_na.header.lifetime_t1)); lt_t2 = MIN(lt_t2, be32toh(lease->ia_na.header.lifetime_t2)); break; } case SD_DHCP6_OPTION_IA_PD: { _cleanup_(dhcp6_lease_free_ia) DHCP6IA ia = {}; if (client->state == DHCP6_STATE_INFORMATION_REQUEST) { log_dhcp6_client(client, "Ignoring IA PD option in information requesting mode."); break; } r = dhcp6_option_parse_ia(client, client->ia_pd.header.id, optcode, optlen, optval, &ia); if (r == -ENOMEM) return r; if (r < 0) continue; if (lease->ia_pd.addresses) { log_dhcp6_client(client, "Received duplicate matching IA_PD option, ignoring."); continue; } lease->ia_pd = ia; ia = (DHCP6IA) {}; lt_t1 = MIN(lt_t1, be32toh(lease->ia_pd.header.lifetime_t1)); lt_t2 = MIN(lt_t2, be32toh(lease->ia_pd.header.lifetime_t2)); break; } case SD_DHCP6_OPTION_RAPID_COMMIT: r = dhcp6_lease_set_rapid_commit(lease); if (r < 0) return r; break; case SD_DHCP6_OPTION_DNS_SERVERS: r = dhcp6_lease_add_dns(lease, optval, optlen); if (r < 0) log_dhcp6_client_errno(client, r, "Failed to parse DNS server option, ignoring: %m"); break; case SD_DHCP6_OPTION_DOMAIN_LIST: r = dhcp6_lease_add_domains(lease, optval, optlen); if (r < 0) log_dhcp6_client_errno(client, r, "Failed to parse domain list option, ignoring: %m"); break; case SD_DHCP6_OPTION_NTP_SERVER: r = dhcp6_lease_add_ntp(lease, optval, optlen); if (r < 0) log_dhcp6_client_errno(client, r, "Failed to parse NTP server option, ignoring: %m"); break; case SD_DHCP6_OPTION_SNTP_SERVERS: r = dhcp6_lease_add_sntp(lease, optval, optlen); if (r < 0) log_dhcp6_client_errno(client, r, "Failed to parse SNTP server option, ignoring: %m"); break; case SD_DHCP6_OPTION_CLIENT_FQDN: r = dhcp6_lease_set_fqdn(lease, optval, optlen); if (r < 0) log_dhcp6_client_errno(client, r, "Failed to parse FQDN option, ignoring: %m"); break; case SD_DHCP6_OPTION_INFORMATION_REFRESH_TIME: if (optlen != 4) return -EINVAL; irt = unaligned_read_be32((be32_t *) optval) * USEC_PER_SEC; break; } } uint8_t *clientid; size_t clientid_len; if (dhcp6_lease_get_clientid(lease, &clientid, &clientid_len) < 0) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "%s message does not contain client ID. Ignoring.", dhcp6_message_type_to_string(message->type)); if (clientid_len != client->duid_len || memcmp(clientid, &client->duid, clientid_len) != 0) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "The client ID in %s message does not match. Ignoring.", dhcp6_message_type_to_string(message->type)); if (client->state != DHCP6_STATE_INFORMATION_REQUEST) { r = dhcp6_lease_get_serverid(lease, NULL, NULL); if (r < 0) return log_dhcp6_client_errno(client, r, "%s has no server id", dhcp6_message_type_to_string(message->type)); if (!lease->ia_na.addresses && !lease->ia_pd.addresses) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "No IA_PD prefix or IA_NA address received. Ignoring."); if (lease->ia_na.addresses) { lease->ia_na.header.lifetime_t1 = htobe32(lt_t1); lease->ia_na.header.lifetime_t2 = htobe32(lt_t2); } if (lease->ia_pd.addresses) { lease->ia_pd.header.lifetime_t1 = htobe32(lt_t1); lease->ia_pd.header.lifetime_t2 = htobe32(lt_t2); } } client->information_refresh_time_usec = MAX(irt, IRT_MINIMUM); return 0; } static int client_receive_reply( sd_dhcp6_client *client, DHCP6Message *reply, size_t len, const triple_timestamp *t, const struct in6_addr *server_address) { _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; bool rapid_commit; int r; assert(client); assert(reply); assert(t); if (reply->type != DHCP6_MESSAGE_REPLY) return 0; r = dhcp6_lease_new(&lease); if (r < 0) return -ENOMEM; lease->timestamp = *t; if (server_address) lease->server_address = *server_address; r = client_parse_message(client, reply, len, lease); if (r < 0) return r; if (client->state == DHCP6_STATE_SOLICITATION) { r = dhcp6_lease_get_rapid_commit(lease, &rapid_commit); if (r < 0) return r; if (!rapid_commit) return 0; } sd_dhcp6_lease_unref(client->lease); client->lease = TAKE_PTR(lease); return DHCP6_STATE_BOUND; } static int client_receive_advertise( sd_dhcp6_client *client, DHCP6Message *advertise, size_t len, const triple_timestamp *t, const struct in6_addr *server_address) { _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; uint8_t pref_advertise = 0, pref_lease = 0; int r; assert(client); assert(advertise); assert(t); if (advertise->type != DHCP6_MESSAGE_ADVERTISE) return 0; r = dhcp6_lease_new(&lease); if (r < 0) return r; lease->timestamp = *t; if (server_address) lease->server_address = *server_address; r = client_parse_message(client, advertise, len, lease); if (r < 0) return r; r = dhcp6_lease_get_preference(lease, &pref_advertise); if (r < 0) return r; if (client->lease) { r = dhcp6_lease_get_preference(client->lease, &pref_lease); if (r < 0) return r; } if (!client->lease || pref_advertise > pref_lease) { sd_dhcp6_lease_unref(client->lease); client->lease = TAKE_PTR(lease); r = 0; } if (pref_advertise == 255 || client->retransmit_count > 1) r = DHCP6_STATE_REQUEST; return r; } static int client_receive_message( sd_event_source *s, int fd, uint32_t revents, void *userdata) { sd_dhcp6_client *client = userdata; DHCP6_CLIENT_DONT_DESTROY(client); /* This needs to be initialized with zero. See #20741. */ CMSG_BUFFER_TYPE(CMSG_SPACE_TIMEVAL) control = {}; struct iovec iov; union sockaddr_union sa = {}; struct msghdr msg = { .msg_name = &sa.sa, .msg_namelen = sizeof(sa), .msg_iov = &iov, .msg_iovlen = 1, .msg_control = &control, .msg_controllen = sizeof(control), }; struct cmsghdr *cmsg; triple_timestamp t = {}; _cleanup_free_ DHCP6Message *message = NULL; struct in6_addr *server_address = NULL; ssize_t buflen, len; int r = 0; assert(s); assert(client); assert(client->event); buflen = next_datagram_size_fd(fd); if (buflen < 0) { if (ERRNO_IS_TRANSIENT(buflen) || ERRNO_IS_DISCONNECT(buflen)) return 0; log_dhcp6_client_errno(client, buflen, "Failed to determine datagram size to read, ignoring: %m"); return 0; } message = malloc(buflen); if (!message) return -ENOMEM; iov = IOVEC_MAKE(message, buflen); len = recvmsg_safe(fd, &msg, MSG_DONTWAIT); if (len < 0) { if (ERRNO_IS_TRANSIENT(len) || ERRNO_IS_DISCONNECT(len)) return 0; log_dhcp6_client_errno(client, len, "Could not receive message from UDP socket, ignoring: %m"); return 0; } if ((size_t) len < sizeof(DHCP6Message)) { log_dhcp6_client(client, "Too small to be DHCP6 message: ignoring"); return 0; } /* msg_namelen == 0 happens when running the test-suite over a socketpair */ if (msg.msg_namelen > 0) { if (msg.msg_namelen != sizeof(struct sockaddr_in6) || sa.in6.sin6_family != AF_INET6) { log_dhcp6_client(client, "Received message from invalid source, ignoring."); return 0; } server_address = &sa.in6.sin6_addr; } CMSG_FOREACH(cmsg, &msg) { if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SO_TIMESTAMP && cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval))) triple_timestamp_from_realtime(&t, timeval_load((struct timeval*) CMSG_DATA(cmsg))); } if (!triple_timestamp_is_set(&t)) triple_timestamp_get(&t); if (!IN_SET(message->type, DHCP6_MESSAGE_ADVERTISE, DHCP6_MESSAGE_REPLY, DHCP6_MESSAGE_RECONFIGURE)) { const char *type_str = dhcp6_message_type_to_string(message->type); if (type_str) log_dhcp6_client(client, "Received unexpected %s message, ignoring.", type_str); else log_dhcp6_client(client, "Received unsupported message type %u, ignoring.", message->type); return 0; } if (client->transaction_id != (message->transaction_id & htobe32(0x00ffffff))) return 0; switch (client->state) { case DHCP6_STATE_INFORMATION_REQUEST: r = client_receive_reply(client, message, len, &t, server_address); if (r < 0) { log_dhcp6_client_errno(client, r, "Failed to process received reply message, ignoring: %m"); return 0; } client_notify(client, SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST); client_start(client, DHCP6_STATE_STOPPED); break; case DHCP6_STATE_SOLICITATION: r = client_receive_advertise(client, message, len, &t, server_address); if (r < 0) { log_dhcp6_client_errno(client, r, "Failed to process received advertise message, ignoring: %m"); return 0; } if (r == DHCP6_STATE_REQUEST) { client_start(client, r); break; } _fallthrough_; /* for Solicitation Rapid Commit option check */ case DHCP6_STATE_REQUEST: case DHCP6_STATE_RENEW: case DHCP6_STATE_REBIND: r = client_receive_reply(client, message, len, &t, server_address); if (r < 0) { log_dhcp6_client_errno(client, r, "Failed to process received reply message, ignoring: %m"); return 0; } if (r == DHCP6_STATE_BOUND) { r = client_start(client, DHCP6_STATE_BOUND); if (r < 0) { client_stop(client, r); return 0; } client_notify(client, SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE); } break; case DHCP6_STATE_BOUND: break; case DHCP6_STATE_STOPPED: return 0; default: assert_not_reached(); } log_dhcp6_client(client, "Recv %s", dhcp6_message_type_to_string(message->type)); return 0; } static int client_get_lifetime(sd_dhcp6_client *client, uint32_t *lifetime_t1, uint32_t *lifetime_t2) { assert_return(client, -EINVAL); assert_return(client->lease, -EINVAL); if (FLAGS_SET(client->request_ia, DHCP6_REQUEST_IA_NA) && client->lease->ia_na.addresses) { *lifetime_t1 = be32toh(client->lease->ia_na.header.lifetime_t1); *lifetime_t2 = be32toh(client->lease->ia_na.header.lifetime_t2); return 0; } if (FLAGS_SET(client->request_ia, DHCP6_REQUEST_IA_PD) && client->lease->ia_pd.addresses) { *lifetime_t1 = be32toh(client->lease->ia_pd.header.lifetime_t1); *lifetime_t2 = be32toh(client->lease->ia_pd.header.lifetime_t2); return 0; } return -ENOMSG; } static int client_start(sd_dhcp6_client *client, DHCP6State state) { int r; usec_t timeout, time_now; uint32_t lifetime_t1, lifetime_t2; assert_return(client, -EINVAL); assert_return(client->event, -EINVAL); assert_return(client->ifindex > 0, -EINVAL); assert_return(client->state != state, -EINVAL); (void) event_source_disable(client->timeout_resend_expire); (void) event_source_disable(client->timeout_resend); client->retransmit_time = 0; client->retransmit_count = 0; r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); if (r < 0) return r; if (!client->receive_message) { r = sd_event_add_io(client->event, &client->receive_message, client->fd, EPOLLIN, client_receive_message, client); if (r < 0) goto error; r = sd_event_source_set_priority(client->receive_message, client->event_priority); if (r < 0) goto error; r = sd_event_source_set_description(client->receive_message, "dhcp6-receive-message"); if (r < 0) goto error; } switch (state) { case DHCP6_STATE_STOPPED: if (client->state == DHCP6_STATE_INFORMATION_REQUEST) { client->state = DHCP6_STATE_STOPPED; return 0; } _fallthrough_; case DHCP6_STATE_SOLICITATION: client->state = DHCP6_STATE_SOLICITATION; break; case DHCP6_STATE_INFORMATION_REQUEST: case DHCP6_STATE_REQUEST: case DHCP6_STATE_RENEW: case DHCP6_STATE_REBIND: client->state = state; break; case DHCP6_STATE_BOUND: r = client_get_lifetime(client, &lifetime_t1, &lifetime_t2); if (r < 0) goto error; if (lifetime_t1 == 0xffffffff || lifetime_t2 == 0xffffffff) { log_dhcp6_client(client, "Infinite T1 0x%08x or T2 0x%08x", lifetime_t1, lifetime_t2); return 0; } timeout = client_timeout_compute_random(lifetime_t1 * USEC_PER_SEC); log_dhcp6_client(client, "T1 expires in %s", FORMAT_TIMESPAN(timeout, USEC_PER_SEC)); r = event_reset_time(client->event, &client->timeout_t1, clock_boottime_or_monotonic(), time_now + timeout, 10 * USEC_PER_SEC, client_timeout_t1, client, client->event_priority, "dhcp6-t1-timeout", true); if (r < 0) goto error; timeout = client_timeout_compute_random(lifetime_t2 * USEC_PER_SEC); log_dhcp6_client(client, "T2 expires in %s", FORMAT_TIMESPAN(timeout, USEC_PER_SEC)); r = event_reset_time(client->event, &client->timeout_t2, clock_boottime_or_monotonic(), time_now + timeout, 10 * USEC_PER_SEC, client_timeout_t2, client, client->event_priority, "dhcp6-t2-timeout", true); if (r < 0) goto error; client->state = state; return 0; default: assert_not_reached(); } client->transaction_id = random_u32() & htobe32(0x00ffffff); client->transaction_start = time_now; r = event_reset_time(client->event, &client->timeout_resend, clock_boottime_or_monotonic(), 0, 0, client_timeout_resend, client, client->event_priority, "dhcp6-resend-timeout", true); if (r < 0) goto error; return 0; error: client_reset(client); return r; } int sd_dhcp6_client_stop(sd_dhcp6_client *client) { if (!client) return 0; client_stop(client, SD_DHCP6_CLIENT_EVENT_STOP); client->fd = safe_close(client->fd); return 0; } int sd_dhcp6_client_is_running(sd_dhcp6_client *client) { assert_return(client, -EINVAL); return client->state != DHCP6_STATE_STOPPED; } int sd_dhcp6_client_start(sd_dhcp6_client *client) { DHCP6State state = DHCP6_STATE_SOLICITATION; int r; assert_return(client, -EINVAL); assert_return(client->event, -EINVAL); assert_return(client->ifindex > 0, -EINVAL); assert_return(in6_addr_is_link_local(&client->local_address) > 0, -EINVAL); if (client->state != DHCP6_STATE_STOPPED) return -EBUSY; if (!client->information_request && client->request_ia == 0) return -EINVAL; r = client_reset(client); if (r < 0) return r; r = client_ensure_iaid(client); if (r < 0) return r; r = client_ensure_duid(client); if (r < 0) return r; if (client->fd < 0) { r = dhcp6_network_bind_udp_socket(client->ifindex, &client->local_address); if (r < 0) { _cleanup_free_ char *p = NULL; (void) in_addr_to_string(AF_INET6, (const union in_addr_union*) &client->local_address, &p); return log_dhcp6_client_errno(client, r, "Failed to bind to UDP socket at address %s: %m", strna(p)); } client->fd = r; } if (client->information_request) { usec_t t = now(CLOCK_MONOTONIC); if (t < usec_add(client->information_request_time_usec, client->information_refresh_time_usec)) return 0; client->information_request_time_usec = t; state = DHCP6_STATE_INFORMATION_REQUEST; } log_dhcp6_client(client, "Started in %s mode", client->information_request ? "Information request" : "Managed"); return client_start(client, state); } int sd_dhcp6_client_attach_event(sd_dhcp6_client *client, sd_event *event, int64_t priority) { int r; assert_return(client, -EINVAL); assert_return(!client->event, -EBUSY); if (event) client->event = sd_event_ref(event); else { r = sd_event_default(&client->event); if (r < 0) return 0; } client->event_priority = priority; return 0; } int sd_dhcp6_client_detach_event(sd_dhcp6_client *client) { assert_return(client, -EINVAL); client->event = sd_event_unref(client->event); return 0; } sd_event *sd_dhcp6_client_get_event(sd_dhcp6_client *client) { assert_return(client, NULL); return client->event; } static sd_dhcp6_client *dhcp6_client_free(sd_dhcp6_client *client) { assert(client); client->timeout_resend = sd_event_source_unref(client->timeout_resend); client->timeout_resend_expire = sd_event_source_unref(client->timeout_resend_expire); client->timeout_t1 = sd_event_source_unref(client->timeout_t1); client->timeout_t2 = sd_event_source_unref(client->timeout_t2); client_reset(client); client->fd = safe_close(client->fd); sd_dhcp6_client_detach_event(client); free(client->req_opts); free(client->fqdn); free(client->mudurl); ordered_hashmap_free(client->extra_options); strv_free(client->user_class); strv_free(client->vendor_class); free(client->ifname); return mfree(client); } DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp6_client, sd_dhcp6_client, dhcp6_client_free); int sd_dhcp6_client_new(sd_dhcp6_client **ret) { _cleanup_(sd_dhcp6_client_unrefp) sd_dhcp6_client *client = NULL; _cleanup_free_ be16_t *req_opts = NULL; size_t t; assert_return(ret, -EINVAL); req_opts = new(be16_t, ELEMENTSOF(default_req_opts)); if (!req_opts) return -ENOMEM; for (t = 0; t < ELEMENTSOF(default_req_opts); t++) req_opts[t] = htobe16(default_req_opts[t]); client = new(sd_dhcp6_client, 1); if (!client) return -ENOMEM; *client = (sd_dhcp6_client) { .n_ref = 1, .ia_na.type = SD_DHCP6_OPTION_IA_NA, .ia_pd.type = SD_DHCP6_OPTION_IA_PD, .ifindex = -1, .request_ia = DHCP6_REQUEST_IA_NA | DHCP6_REQUEST_IA_PD, .fd = -1, .req_opts_len = ELEMENTSOF(default_req_opts), .hint_pd_prefix.iapdprefix.lifetime_preferred = (be32_t) -1, .hint_pd_prefix.iapdprefix.lifetime_valid = (be32_t) -1, .req_opts = TAKE_PTR(req_opts), }; *ret = TAKE_PTR(client); return 0; }