| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| /*** |
| Copyright © 2014-2015 Intel Corporation. All rights reserved. |
| ***/ |
| |
| #include <errno.h> |
| #include <sys/ioctl.h> |
| #include <linux/if_arp.h> |
| #include <linux/if_infiniband.h> |
| |
| #include "sd-dhcp6-client.h" |
| |
| #include "alloc-util.h" |
| #include "device-util.h" |
| #include "dhcp-identifier.h" |
| #include "dhcp6-internal.h" |
| #include "dhcp6-lease-internal.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 "random-util.h" |
| #include "socket-util.h" |
| #include "sort-util.h" |
| #include "strv.h" |
| #include "web-util.h" |
| |
| #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_transaction(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(!sd_dhcp6_client_is_running(client), -EBUSY); |
| assert_return(ifindex > 0, -EINVAL); |
| |
| 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(!sd_dhcp6_client_is_running(client), -EBUSY); |
| assert_return(local_address, -EINVAL); |
| assert_return(in6_addr_is_link_local(local_address) > 0, -EINVAL); |
| |
| 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 <= sizeof(client->hw_addr.bytes), -EINVAL); |
| |
| /* Unlike the other setters, it is OK to set a new MAC address while the client is running, |
| * as the MAC address is used only when setting DUID or IAID. */ |
| |
| 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->hw_addr.length = 0; |
| return 0; |
| } |
| |
| client->arp_type = arp_type; |
| hw_addr_set(&client->hw_addr, addr, addr_len); |
| |
| return 0; |
| } |
| |
| int sd_dhcp6_client_set_prefix_delegation_hint( |
| sd_dhcp6_client *client, |
| uint8_t prefixlen, |
| const struct in6_addr *pd_prefix) { |
| |
| _cleanup_free_ DHCP6Address *prefix = NULL; |
| |
| assert_return(client, -EINVAL); |
| assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
| |
| if (!pd_prefix) { |
| /* clear previous assignments. */ |
| dhcp6_ia_clear_addresses(&client->ia_pd); |
| return 0; |
| } |
| |
| assert_return(prefixlen > 0 && prefixlen <= 128, -EINVAL); |
| |
| prefix = new(DHCP6Address, 1); |
| if (!prefix) |
| return -ENOMEM; |
| |
| *prefix = (DHCP6Address) { |
| .iapdprefix.address = *pd_prefix, |
| .iapdprefix.prefixlen = prefixlen, |
| }; |
| |
| LIST_PREPEND(addresses, client->ia_pd.addresses, TAKE_PTR(prefix)); |
| return 1; |
| } |
| |
| int sd_dhcp6_client_add_vendor_option(sd_dhcp6_client *client, sd_dhcp6_option *v) { |
| int r; |
| |
| assert_return(client, -EINVAL); |
| assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
| |
| if (!v) { |
| /* Clear the previous assignments. */ |
| ordered_set_clear(client->vendor_options); |
| return 0; |
| } |
| |
| r = ordered_set_ensure_put(&client->vendor_options, &dhcp6_option_hash_ops, v); |
| if (r < 0) |
| return r; |
| |
| sd_dhcp6_option_ref(v); |
| |
| return 1; |
| } |
| |
| static int client_ensure_duid(sd_dhcp6_client *client) { |
| assert(client); |
| |
| if (client->duid_len != 0) |
| return 0; |
| |
| return dhcp_identifier_set_duid_en(client->test_mode, &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, |
| DUIDType duid_type, |
| const void *duid, |
| size_t duid_len, |
| usec_t llt_time) { |
| int r; |
| |
| assert_return(client, -EINVAL); |
| assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
| assert_return(duid_len == 0 || duid, -EINVAL); |
| |
| 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 %i 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 { |
| r = dhcp_identifier_set_duid(duid_type, &client->hw_addr, client->arp_type, llt_time, |
| client->test_mode, &client->duid, &client->duid_len); |
| if (r == -EOPNOTSUPP) |
| return log_dhcp6_client_errno(client, r, |
| "Failed to set %s. MAC address is not set or " |
| "interface type is not supported.", |
| duid_type_to_string(duid_type)); |
| if (r < 0) |
| return log_dhcp6_client_errno(client, r, "Failed to set %s: %m", |
| duid_type_to_string(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); |
| } |
| |
| 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 = 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(!sd_dhcp6_client_is_running(client), -EBUSY); |
| |
| client->ia_na.header.id = htobe32(iaid); |
| client->ia_pd.header.id = htobe32(iaid); |
| client->iaid_set = true; |
| |
| 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->dev, &client->hw_addr, |
| /* legacy_unstable_byteorder = */ true, |
| &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 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; |
| } |
| |
| void dhcp6_client_set_test_mode(sd_dhcp6_client *client, bool test_mode) { |
| assert(client); |
| |
| client->test_mode = test_mode; |
| } |
| |
| int sd_dhcp6_client_set_fqdn( |
| sd_dhcp6_client *client, |
| const char *fqdn) { |
| |
| assert_return(client, -EINVAL); |
| assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
| |
| /* 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(!sd_dhcp6_client_is_running(client), -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; |
| } |
| |
| static int be16_compare_func(const be16_t *a, const be16_t *b) { |
| return CMP(be16toh(*a), be16toh(*b)); |
| } |
| |
| int sd_dhcp6_client_set_request_option(sd_dhcp6_client *client, uint16_t option) { |
| be16_t opt; |
| |
| assert_return(client, -EINVAL); |
| assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
| |
| if (!dhcp6_option_can_request(option)) |
| return -EINVAL; |
| |
| opt = htobe16(option); |
| if (typesafe_bsearch(&opt, client->req_opts, client->n_req_opts, be16_compare_func)) |
| return -EEXIST; |
| |
| if (!GREEDY_REALLOC(client->req_opts, client->n_req_opts + 1)) |
| return -ENOMEM; |
| |
| client->req_opts[client->n_req_opts++] = opt; |
| |
| /* Sort immediately to make the above binary search will work for the next time. */ |
| typesafe_qsort(client->req_opts, client->n_req_opts, be16_compare_func); |
| return 0; |
| } |
| |
| int sd_dhcp6_client_set_request_mud_url(sd_dhcp6_client *client, const char *mudurl) { |
| assert_return(client, -EINVAL); |
| assert_return(!sd_dhcp6_client_is_running(client), -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 **s; |
| |
| assert_return(client, -EINVAL); |
| assert_return(!sd_dhcp6_client_is_running(client), -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 **s; |
| |
| assert_return(client, -EINVAL); |
| assert_return(!sd_dhcp6_client_is_running(client), -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); |
| assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
| |
| 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); |
| assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
| |
| SET_FLAG(client->request_ia, DHCP6_REQUEST_IA_NA, request); |
| |
| return 0; |
| } |
| |
| int dhcp6_client_set_transaction_id(sd_dhcp6_client *client, uint32_t transaction_id) { |
| assert(client); |
| assert(client->test_mode); |
| |
| /* This is for tests or fuzzers. */ |
| |
| client->transaction_id = transaction_id & htobe32(0x00ffffff); |
| |
| return 0; |
| } |
| |
| int sd_dhcp6_client_set_rapid_commit(sd_dhcp6_client *client, int enable) { |
| assert_return(client, -EINVAL); |
| assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
| |
| client->rapid_commit = enable; |
| return 0; |
| } |
| |
| int sd_dhcp6_client_set_send_release(sd_dhcp6_client *client, int enable) { |
| assert_return(client, -EINVAL); |
| assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
| |
| client->send_release = enable; |
| 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_set_state(sd_dhcp6_client *client, DHCP6State state) { |
| assert(client); |
| |
| if (client->state == state) |
| return; |
| |
| log_dhcp6_client(client, "State changed: %s -> %s", |
| dhcp6_state_to_string(client->state), dhcp6_state_to_string(state)); |
| |
| client->state = state; |
| } |
| |
| static void client_notify(sd_dhcp6_client *client, int event) { |
| assert(client); |
| |
| if (client->callback) |
| client->callback(client, event, client->userdata); |
| } |
| |
| static void client_cleanup(sd_dhcp6_client *client) { |
| assert(client); |
| |
| client->lease = sd_dhcp6_lease_unref(client->lease); |
| |
| /* Reset IRT here. Otherwise, we cannot restart the client in the information requesting mode, |
| * even though the lease is freed below. */ |
| client->information_request_time_usec = 0; |
| client->information_refresh_time_usec = 0; |
| |
| (void) event_source_disable(client->receive_message); |
| (void) event_source_disable(client->timeout_resend); |
| (void) event_source_disable(client->timeout_expire); |
| (void) event_source_disable(client->timeout_t1); |
| (void) event_source_disable(client->timeout_t2); |
| |
| client_set_state(client, DHCP6_STATE_STOPPED); |
| } |
| |
| static void client_stop(sd_dhcp6_client *client, int error) { |
| DHCP6_CLIENT_DONT_DESTROY(client); |
| |
| assert(client); |
| |
| client_notify(client, error); |
| |
| client_cleanup(client); |
| } |
| |
| static int client_append_common_options_in_managed_mode( |
| sd_dhcp6_client *client, |
| uint8_t **buf, |
| size_t *offset, |
| const DHCP6IA *ia_na, |
| const DHCP6IA *ia_pd) { |
| |
| int r; |
| |
| assert(client); |
| assert(IN_SET(client->state, |
| DHCP6_STATE_SOLICITATION, |
| DHCP6_STATE_REQUEST, |
| DHCP6_STATE_RENEW, |
| DHCP6_STATE_REBIND, |
| DHCP6_STATE_STOPPING)); |
| assert(buf); |
| assert(*buf); |
| assert(offset); |
| |
| if (FLAGS_SET(client->request_ia, DHCP6_REQUEST_IA_NA) && ia_na) { |
| r = dhcp6_option_append_ia(buf, offset, ia_na); |
| if (r < 0) |
| return r; |
| } |
| |
| if (FLAGS_SET(client->request_ia, DHCP6_REQUEST_IA_PD) && ia_pd) { |
| r = dhcp6_option_append_ia(buf, offset, ia_pd); |
| if (r < 0) |
| return r; |
| } |
| |
| if (client->state != DHCP6_STATE_STOPPING) { |
| r = dhcp6_option_append_fqdn(buf, offset, client->fqdn); |
| if (r < 0) |
| return r; |
| } |
| |
| r = dhcp6_option_append_user_class(buf, offset, client->user_class); |
| if (r < 0) |
| return r; |
| |
| r = dhcp6_option_append_vendor_class(buf, offset, client->vendor_class); |
| if (r < 0) |
| return r; |
| |
| r = dhcp6_option_append_vendor_option(buf, offset, 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; |
| case DHCP6_STATE_STOPPING: |
| return DHCP6_MESSAGE_RELEASE; |
| default: |
| assert_not_reached(); |
| } |
| } |
| |
| static int client_append_oro(sd_dhcp6_client *client, uint8_t **buf, size_t *offset) { |
| _cleanup_free_ be16_t *p = NULL; |
| be16_t *req_opts; |
| size_t n; |
| |
| assert(client); |
| assert(buf); |
| assert(*buf); |
| assert(offset); |
| |
| switch (client->state) { |
| case DHCP6_STATE_INFORMATION_REQUEST: |
| n = client->n_req_opts; |
| p = new(be16_t, n + 2); |
| if (!p) |
| return -ENOMEM; |
| |
| memcpy_safe(p, client->req_opts, n * sizeof(be16_t)); |
| p[n++] = htobe16(SD_DHCP6_OPTION_INFORMATION_REFRESH_TIME); /* RFC 8415 section 21.23 */ |
| p[n++] = htobe16(SD_DHCP6_OPTION_INF_MAX_RT); /* RFC 8415 section 21.25 */ |
| |
| typesafe_qsort(p, n, be16_compare_func); |
| req_opts = p; |
| break; |
| |
| case DHCP6_STATE_SOLICITATION: |
| n = client->n_req_opts; |
| p = new(be16_t, n + 1); |
| if (!p) |
| return -ENOMEM; |
| |
| memcpy_safe(p, client->req_opts, n * sizeof(be16_t)); |
| p[n++] = htobe16(SD_DHCP6_OPTION_SOL_MAX_RT); /* RFC 8415 section 21.24 */ |
| |
| typesafe_qsort(p, n, be16_compare_func); |
| req_opts = p; |
| break; |
| |
| case DHCP6_STATE_STOPPING: |
| return 0; |
| |
| default: |
| n = client->n_req_opts; |
| req_opts = client->req_opts; |
| } |
| |
| if (n == 0) |
| return 0; |
| |
| return dhcp6_option_append(buf, offset, SD_DHCP6_OPTION_ORO, n * sizeof(be16_t), req_opts); |
| } |
| |
| static int client_append_mudurl(sd_dhcp6_client *client, uint8_t **buf, size_t *offset) { |
| assert(client); |
| assert(buf); |
| assert(*buf); |
| assert(offset); |
| |
| if (!client->mudurl) |
| return 0; |
| |
| if (client->state == DHCP6_STATE_STOPPING) |
| return 0; |
| |
| return dhcp6_option_append(buf, offset, SD_DHCP6_OPTION_MUD_URL_V6, |
| strlen(client->mudurl), client->mudurl); |
| } |
| |
| int dhcp6_client_send_message(sd_dhcp6_client *client) { |
| _cleanup_free_ uint8_t *buf = NULL; |
| struct in6_addr all_servers = |
| IN6ADDR_ALL_DHCP6_RELAY_AGENTS_AND_SERVERS_INIT; |
| struct sd_dhcp6_option *j; |
| usec_t elapsed_usec, time_now; |
| be16_t elapsed_time; |
| DHCP6Message *message; |
| size_t offset; |
| int r; |
| |
| assert(client); |
| assert(client->event); |
| |
| r = sd_event_now(client->event, CLOCK_BOOTTIME, &time_now); |
| if (r < 0) |
| return r; |
| |
| if (!GREEDY_REALLOC0(buf, offsetof(DHCP6Message, options))) |
| return -ENOMEM; |
| |
| message = (DHCP6Message*) buf; |
| message->transaction_id = client->transaction_id; |
| message->type = client_message_type_from_state(client); |
| offset = offsetof(DHCP6Message, options); |
| |
| switch (client->state) { |
| case DHCP6_STATE_INFORMATION_REQUEST: |
| break; |
| |
| case DHCP6_STATE_SOLICITATION: |
| if (client->rapid_commit) { |
| r = dhcp6_option_append(&buf, &offset, SD_DHCP6_OPTION_RAPID_COMMIT, 0, NULL); |
| if (r < 0) |
| return r; |
| } |
| |
| r = client_append_common_options_in_managed_mode(client, &buf, &offset, |
| &client->ia_na, &client->ia_pd); |
| if (r < 0) |
| return r; |
| break; |
| |
| case DHCP6_STATE_REQUEST: |
| case DHCP6_STATE_RENEW: |
| case DHCP6_STATE_STOPPING: |
| r = dhcp6_option_append(&buf, &offset, 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, &buf, &offset, |
| client->lease->ia_na, client->lease->ia_pd); |
| if (r < 0) |
| return r; |
| break; |
| |
| case DHCP6_STATE_BOUND: |
| case DHCP6_STATE_STOPPED: |
| default: |
| assert_not_reached(); |
| } |
| |
| r = client_append_mudurl(client, &buf, &offset); |
| if (r < 0) |
| return r; |
| |
| r = client_append_oro(client, &buf, &offset); |
| if (r < 0) |
| return r; |
| |
| assert(client->duid_len > 0); |
| r = dhcp6_option_append(&buf, &offset, SD_DHCP6_OPTION_CLIENTID, |
| client->duid_len, &client->duid); |
| if (r < 0) |
| return r; |
| |
| ORDERED_HASHMAP_FOREACH(j, client->extra_options) { |
| r = dhcp6_option_append(&buf, &offset, j->option, j->length, j->data); |
| 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(&buf, &offset, SD_DHCP6_OPTION_ELAPSED_TIME, sizeof(elapsed_time), &elapsed_time); |
| if (r < 0) |
| return r; |
| |
| r = dhcp6_network_send_udp_socket(client->fd, &all_servers, buf, offset); |
| if (r < 0) |
| return r; |
| |
| log_dhcp6_client(client, "Sent %s", |
| dhcp6_message_type_to_string(client_message_type_from_state(client))); |
| return 0; |
| } |
| |
| static usec_t client_timeout_compute_random(usec_t val) { |
| return usec_sub_unsigned(val, random_u64_range(val / 10)); |
| } |
| |
| static int client_timeout_resend(sd_event_source *s, uint64_t usec, void *userdata) { |
| sd_dhcp6_client *client = ASSERT_PTR(userdata); |
| usec_t init_retransmit_time, max_retransmit_time; |
| int r; |
| |
| assert(client->event); |
| |
| 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) { |
| (void) client_start_transaction(client, DHCP6_STATE_REQUEST); |
| return 0; |
| } |
| |
| init_retransmit_time = DHCP6_SOL_TIMEOUT; |
| max_retransmit_time = DHCP6_SOL_MAX_RT; |
| break; |
| |
| case DHCP6_STATE_REQUEST: |
| |
| if (client->retransmit_count >= DHCP6_REQ_MAX_RC) { |
| client_stop(client, SD_DHCP6_CLIENT_EVENT_RETRANS_MAX); |
| return 0; |
| } |
| |
| init_retransmit_time = DHCP6_REQ_TIMEOUT; |
| max_retransmit_time = DHCP6_REQ_MAX_RT; |
| 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; |
| |
| /* Also, instead of setting MRD, the expire timer is already set in client_enter_bound_state(). */ |
| break; |
| |
| case DHCP6_STATE_STOPPED: |
| case DHCP6_STATE_STOPPING: |
| case DHCP6_STATE_BOUND: |
| default: |
| assert_not_reached(); |
| } |
| |
| r = dhcp6_client_send_message(client); |
| 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 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_relative(client->event, &client->timeout_resend, |
| CLOCK_BOOTTIME, |
| client->retransmit_time, 10 * USEC_PER_MSEC, |
| client_timeout_resend, client, |
| client->event_priority, "dhcp6-resend-timer", true); |
| if (r < 0) |
| client_stop(client, r); |
| |
| return 0; |
| } |
| |
| static int client_start_transaction(sd_dhcp6_client *client, DHCP6State state) { |
| int r; |
| |
| assert(client); |
| assert(client->event); |
| |
| switch (state) { |
| case DHCP6_STATE_INFORMATION_REQUEST: |
| case DHCP6_STATE_SOLICITATION: |
| assert(client->state == DHCP6_STATE_STOPPED); |
| break; |
| case DHCP6_STATE_REQUEST: |
| assert(client->state == DHCP6_STATE_SOLICITATION); |
| break; |
| case DHCP6_STATE_RENEW: |
| assert(client->state == DHCP6_STATE_BOUND); |
| break; |
| case DHCP6_STATE_REBIND: |
| assert(IN_SET(client->state, DHCP6_STATE_BOUND, DHCP6_STATE_RENEW)); |
| break; |
| case DHCP6_STATE_STOPPED: |
| case DHCP6_STATE_STOPPING: |
| case DHCP6_STATE_BOUND: |
| default: |
| assert_not_reached(); |
| } |
| |
| client_set_state(client, state); |
| |
| client->retransmit_time = 0; |
| client->retransmit_count = 0; |
| client->transaction_id = random_u32() & htobe32(0x00ffffff); |
| |
| r = sd_event_now(client->event, CLOCK_BOOTTIME, &client->transaction_start); |
| if (r < 0) |
| goto error; |
| |
| r = event_reset_time(client->event, &client->timeout_resend, |
| CLOCK_BOOTTIME, |
| 0, 0, |
| client_timeout_resend, client, |
| client->event_priority, "dhcp6-resend-timeout", true); |
| if (r < 0) |
| goto error; |
| |
| r = sd_event_source_set_enabled(client->receive_message, SD_EVENT_ON); |
| if (r < 0) |
| goto error; |
| |
| return 0; |
| |
| error: |
| client_stop(client, r); |
| return r; |
| } |
| |
| static int client_timeout_expire(sd_event_source *s, uint64_t usec, void *userdata) { |
| sd_dhcp6_client *client = ASSERT_PTR(userdata); |
| DHCP6_CLIENT_DONT_DESTROY(client); |
| DHCP6State state; |
| |
| (void) event_source_disable(client->timeout_expire); |
| (void) event_source_disable(client->timeout_t2); |
| (void) event_source_disable(client->timeout_t1); |
| |
| 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) |
| (void) client_start_transaction(client, DHCP6_STATE_SOLICITATION); |
| |
| return 0; |
| } |
| |
| static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) { |
| sd_dhcp6_client *client = ASSERT_PTR(userdata); |
| |
| (void) event_source_disable(client->timeout_t2); |
| (void) event_source_disable(client->timeout_t1); |
| |
| log_dhcp6_client(client, "Timeout T2"); |
| |
| (void) client_start_transaction(client, DHCP6_STATE_REBIND); |
| |
| return 0; |
| } |
| |
| static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) { |
| sd_dhcp6_client *client = ASSERT_PTR(userdata); |
| |
| (void) event_source_disable(client->timeout_t1); |
| |
| log_dhcp6_client(client, "Timeout T1"); |
| |
| (void) client_start_transaction(client, DHCP6_STATE_RENEW); |
| |
| return 0; |
| } |
| |
| static int client_enter_bound_state(sd_dhcp6_client *client) { |
| usec_t lifetime_t1, lifetime_t2, lifetime_valid; |
| int r; |
| |
| assert(client); |
| assert(client->lease); |
| assert(IN_SET(client->state, |
| DHCP6_STATE_SOLICITATION, |
| DHCP6_STATE_REQUEST, |
| DHCP6_STATE_RENEW, |
| DHCP6_STATE_REBIND)); |
| |
| (void) event_source_disable(client->receive_message); |
| (void) event_source_disable(client->timeout_resend); |
| |
| r = dhcp6_lease_get_lifetime(client->lease, &lifetime_t1, &lifetime_t2, &lifetime_valid); |
| if (r < 0) |
| goto error; |
| |
| lifetime_t2 = client_timeout_compute_random(lifetime_t2); |
| lifetime_t1 = client_timeout_compute_random(MIN(lifetime_t1, lifetime_t2)); |
| |
| if (lifetime_t1 == USEC_INFINITY) { |
| log_dhcp6_client(client, "Infinite T1"); |
| event_source_disable(client->timeout_t1); |
| } else { |
| log_dhcp6_client(client, "T1 expires in %s", FORMAT_TIMESPAN(lifetime_t1, USEC_PER_SEC)); |
| r = event_reset_time_relative(client->event, &client->timeout_t1, |
| CLOCK_BOOTTIME, |
| lifetime_t1, 10 * USEC_PER_SEC, |
| client_timeout_t1, client, |
| client->event_priority, "dhcp6-t1-timeout", true); |
| if (r < 0) |
| goto error; |
| } |
| |
| if (lifetime_t2 == USEC_INFINITY) { |
| log_dhcp6_client(client, "Infinite T2"); |
| event_source_disable(client->timeout_t2); |
| } else { |
| log_dhcp6_client(client, "T2 expires in %s", FORMAT_TIMESPAN(lifetime_t2, USEC_PER_SEC)); |
| r = event_reset_time_relative(client->event, &client->timeout_t2, |
| CLOCK_BOOTTIME, |
| lifetime_t2, 10 * USEC_PER_SEC, |
| client_timeout_t2, client, |
| client->event_priority, "dhcp6-t2-timeout", true); |
| if (r < 0) |
| goto error; |
| } |
| |
| if (lifetime_valid == USEC_INFINITY) { |
| log_dhcp6_client(client, "Infinite valid lifetime"); |
| event_source_disable(client->timeout_expire); |
| } else { |
| log_dhcp6_client(client, "Valid lifetime expires in %s", FORMAT_TIMESPAN(lifetime_valid, USEC_PER_SEC)); |
| |
| r = event_reset_time_relative(client->event, &client->timeout_expire, |
| CLOCK_BOOTTIME, |
| lifetime_valid, USEC_PER_SEC, |
| client_timeout_expire, client, |
| client->event_priority, "dhcp6-lease-expire", true); |
| if (r < 0) |
| goto error; |
| } |
| |
| client_set_state(client, DHCP6_STATE_BOUND); |
| client_notify(client, SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE); |
| return 0; |
| |
| error: |
| client_stop(client, r); |
| return r; |
| } |
| |
| static int log_invalid_message_type(sd_dhcp6_client *client, const DHCP6Message *message) { |
| const char *type_str; |
| |
| assert(client); |
| assert(message); |
| |
| type_str = dhcp6_message_type_to_string(message->type); |
| if (type_str) |
| return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), |
| "Received unexpected %s message, ignoring.", type_str); |
| else |
| return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), |
| "Received unsupported message type %u, ignoring.", message->type); |
| } |
| |
| static int client_process_information( |
| sd_dhcp6_client *client, |
| DHCP6Message *message, |
| size_t len, |
| const triple_timestamp *timestamp, |
| const struct in6_addr *server_address) { |
| |
| _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; |
| int r; |
| |
| assert(client); |
| assert(message); |
| |
| if (message->type != DHCP6_MESSAGE_REPLY) |
| return log_invalid_message_type(client, message); |
| |
| r = dhcp6_lease_new_from_message(client, message, len, timestamp, server_address, &lease); |
| if (r < 0) |
| return log_dhcp6_client_errno(client, r, "Failed to process received reply message, ignoring: %m"); |
| |
| log_dhcp6_client(client, "Processed %s message", dhcp6_message_type_to_string(message->type)); |
| |
| sd_dhcp6_lease_unref(client->lease); |
| client->lease = TAKE_PTR(lease); |
| |
| /* Do not call client_stop() here, as it frees the acquired lease. */ |
| (void) event_source_disable(client->receive_message); |
| (void) event_source_disable(client->timeout_resend); |
| client_set_state(client, DHCP6_STATE_STOPPED); |
| |
| client_notify(client, SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST); |
| return 0; |
| } |
| |
| static int client_process_reply( |
| sd_dhcp6_client *client, |
| DHCP6Message *message, |
| size_t len, |
| const triple_timestamp *timestamp, |
| const struct in6_addr *server_address) { |
| |
| _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; |
| int r; |
| |
| assert(client); |
| assert(message); |
| |
| if (message->type != DHCP6_MESSAGE_REPLY) |
| return log_invalid_message_type(client, message); |
| |
| r = dhcp6_lease_new_from_message(client, message, len, timestamp, server_address, &lease); |
| if (r == -EADDRNOTAVAIL) { |
| |
| /* If NoBinding status code is received, we cannot request the address anymore. |
| * Let's restart transaction from the beginning. */ |
| |
| if (client->state == DHCP6_STATE_REQUEST) |
| /* The lease is not acquired yet, hence it is not necessary to notify the restart. */ |
| client_cleanup(client); |
| else |
| /* We need to notify the previous lease was expired. */ |
| client_stop(client, SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE); |
| |
| return client_start_transaction(client, DHCP6_STATE_SOLICITATION); |
| } |
| if (r < 0) |
| return log_dhcp6_client_errno(client, r, "Failed to process received reply message, ignoring: %m"); |
| |
| log_dhcp6_client(client, "Processed %s message", dhcp6_message_type_to_string(message->type)); |
| |
| sd_dhcp6_lease_unref(client->lease); |
| client->lease = TAKE_PTR(lease); |
| |
| return client_enter_bound_state(client); |
| } |
| |
| static int client_process_advertise_or_rapid_commit_reply( |
| sd_dhcp6_client *client, |
| DHCP6Message *message, |
| size_t len, |
| const triple_timestamp *timestamp, |
| const struct in6_addr *server_address) { |
| |
| _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; |
| uint8_t pref_advertise, pref_lease = 0; |
| int r; |
| |
| assert(client); |
| assert(message); |
| |
| if (!IN_SET(message->type, DHCP6_MESSAGE_ADVERTISE, DHCP6_MESSAGE_REPLY)) |
| return log_invalid_message_type(client, message); |
| |
| r = dhcp6_lease_new_from_message(client, message, len, timestamp, server_address, &lease); |
| if (r < 0) |
| return log_dhcp6_client_errno(client, r, "Failed to process received %s message, ignoring: %m", |
| dhcp6_message_type_to_string(message->type)); |
| |
| if (message->type == DHCP6_MESSAGE_REPLY) { |
| bool rapid_commit; |
| |
| if (!client->rapid_commit) |
| return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), |
| "Received unexpected reply message, even we sent a solicit message without the rapid commit option, ignoring."); |
| |
| r = dhcp6_lease_get_rapid_commit(lease, &rapid_commit); |
| if (r < 0) |
| return r; |
| |
| if (!rapid_commit) |
| return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), |
| "Received reply message without rapid commit flag, ignoring."); |
| |
| log_dhcp6_client(client, "Processed %s message", dhcp6_message_type_to_string(message->type)); |
| |
| sd_dhcp6_lease_unref(client->lease); |
| client->lease = TAKE_PTR(lease); |
| |
| return client_enter_bound_state(client); |
| } |
| |
| 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; |
| } |
| |
| log_dhcp6_client(client, "Processed %s message", dhcp6_message_type_to_string(message->type)); |
| |
| if (!client->lease || pref_advertise > pref_lease) { |
| /* If this is the first advertise message or has higher preference, then save the lease. */ |
| sd_dhcp6_lease_unref(client->lease); |
| client->lease = TAKE_PTR(lease); |
| } |
| |
| if (pref_advertise == 255 || client->retransmit_count > 1) |
| (void) client_start_transaction(client, DHCP6_STATE_REQUEST); |
| |
| return 0; |
| } |
| |
| static int client_receive_message( |
| sd_event_source *s, |
| int fd, uint32_t |
| revents, |
| void *userdata) { |
| |
| sd_dhcp6_client *client = ASSERT_PTR(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; |
| |
| 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(CMSG_TYPED_DATA(cmsg, struct timeval))); |
| } |
| |
| if (client->transaction_id != (message->transaction_id & htobe32(0x00ffffff))) |
| return 0; |
| |
| switch (client->state) { |
| case DHCP6_STATE_INFORMATION_REQUEST: |
| if (client_process_information(client, message, len, &t, server_address) < 0) |
| return 0; |
| break; |
| |
| case DHCP6_STATE_SOLICITATION: |
| if (client_process_advertise_or_rapid_commit_reply(client, message, len, &t, server_address) < 0) |
| return 0; |
| break; |
| |
| case DHCP6_STATE_REQUEST: |
| case DHCP6_STATE_RENEW: |
| case DHCP6_STATE_REBIND: |
| if (client_process_reply(client, message, len, &t, server_address) < 0) |
| return 0; |
| break; |
| |
| case DHCP6_STATE_BOUND: |
| case DHCP6_STATE_STOPPED: |
| case DHCP6_STATE_STOPPING: |
| default: |
| assert_not_reached(); |
| } |
| |
| return 0; |
| } |
| |
| static int client_send_release(sd_dhcp6_client *client) { |
| sd_dhcp6_lease *lease; |
| |
| assert(client); |
| |
| if (!client->send_release) |
| return 0; |
| |
| if (sd_dhcp6_client_get_lease(client, &lease) < 0) |
| return 0; |
| |
| if (!lease->ia_na && !lease->ia_pd) |
| return 0; |
| |
| client_set_state(client, DHCP6_STATE_STOPPING); |
| return dhcp6_client_send_message(client); |
| } |
| |
| int sd_dhcp6_client_stop(sd_dhcp6_client *client) { |
| int r; |
| |
| if (!client) |
| return 0; |
| |
| /* Intentionally ignoring failure to send DHCP6 release. The DHCPv6 client |
| * engine is about to release its UDP socket unconditionally. */ |
| r = client_send_release(client); |
| if (r < 0) |
| log_dhcp6_client_errno(client, r, |
| "Failed to send DHCP6 release message, ignoring: %m"); |
| |
| client_stop(client, SD_DHCP6_CLIENT_EVENT_STOP); |
| |
| client->receive_message = sd_event_source_unref(client->receive_message); |
| 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); |
| assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
| assert_return(client->information_request || client->request_ia != 0, -EINVAL); |
| |
| /* Even if the client is in the STOPPED state, the lease acquired in the previous information |
| * request may be stored. */ |
| client->lease = sd_dhcp6_lease_unref(client->lease); |
| |
| 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) |
| return log_dhcp6_client_errno(client, r, |
| "Failed to bind to UDP socket at address %s: %m", |
| IN6_ADDR_TO_STRING(&client->local_address)); |
| |
| client->fd = r; |
| } |
| |
| if (!client->receive_message) { |
| _cleanup_(sd_event_source_disable_unrefp) sd_event_source *s = NULL; |
| |
| r = sd_event_add_io(client->event, &s, client->fd, EPOLLIN, client_receive_message, client); |
| if (r < 0) |
| return r; |
| |
| r = sd_event_source_set_priority(s, client->event_priority); |
| if (r < 0) |
| return r; |
| |
| r = sd_event_source_set_description(s, "dhcp6-receive-message"); |
| if (r < 0) |
| return r; |
| |
| client->receive_message = TAKE_PTR(s); |
| } |
| |
| 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, "Starting in %s mode", |
| client->information_request ? "Information request" : "Solicit"); |
| |
| return client_start_transaction(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); |
| assert_return(!sd_dhcp6_client_is_running(client), -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); |
| assert_return(!sd_dhcp6_client_is_running(client), -EBUSY); |
| |
| 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; |
| } |
| |
| int sd_dhcp6_client_attach_device(sd_dhcp6_client *client, sd_device *dev) { |
| assert_return(client, -EINVAL); |
| |
| return device_unref_and_replace(client->dev, dev); |
| } |
| |
| static sd_dhcp6_client *dhcp6_client_free(sd_dhcp6_client *client) { |
| if (!client) |
| return NULL; |
| |
| sd_dhcp6_lease_unref(client->lease); |
| |
| sd_event_source_disable_unref(client->receive_message); |
| sd_event_source_disable_unref(client->timeout_resend); |
| sd_event_source_disable_unref(client->timeout_expire); |
| sd_event_source_disable_unref(client->timeout_t1); |
| sd_event_source_disable_unref(client->timeout_t2); |
| sd_event_unref(client->event); |
| |
| client->fd = safe_close(client->fd); |
| |
| sd_device_unref(client->dev); |
| |
| free(client->req_opts); |
| free(client->fqdn); |
| free(client->mudurl); |
| dhcp6_ia_clear_addresses(&client->ia_pd); |
| ordered_hashmap_free(client->extra_options); |
| ordered_set_free(client->vendor_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; |
| |
| assert_return(ret, -EINVAL); |
| |
| 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 = -EBADF, |
| .rapid_commit = true, |
| }; |
| |
| *ret = TAKE_PTR(client); |
| |
| return 0; |
| } |
