diff options
Diffstat (limited to 'src/libsystemd-network/sd-dhcp6-client.c')
| -rw-r--r-- | src/libsystemd-network/sd-dhcp6-client.c | 1333 |
1 files changed, 0 insertions, 1333 deletions
diff --git a/src/libsystemd-network/sd-dhcp6-client.c b/src/libsystemd-network/sd-dhcp6-client.c deleted file mode 100644 index e81215f7d7..0000000000 --- a/src/libsystemd-network/sd-dhcp6-client.c +++ /dev/null @@ -1,1333 +0,0 @@ -/*** - This file is part of systemd. - - Copyright (C) 2014-2015 Intel Corporation. All rights reserved. - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#include <errno.h> -#include <string.h> -#include <sys/ioctl.h> -#include <linux/if_infiniband.h> - -#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 "fd-util.h" -#include "in-addr-util.h" -#include "network-internal.h" -#include "random-util.h" -#include "socket-util.h" -#include "string-table.h" -#include "util.h" - -#define MAX_MAC_ADDR_LEN INFINIBAND_ALEN - -struct sd_dhcp6_client { - unsigned n_ref; - - enum DHCP6State state; - sd_event *event; - int event_priority; - int ifindex; - 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; - be32_t transaction_id; - usec_t transaction_start; - struct sd_dhcp6_lease *lease; - int fd; - bool information_request; - be16_t *req_opts; - size_t req_opts_allocated; - size_t req_opts_len; - 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; -}; - -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_MAX] = { - [DHCP6_SOLICIT] = "SOLICIT", - [DHCP6_ADVERTISE] = "ADVERTISE", - [DHCP6_REQUEST] = "REQUEST", - [DHCP6_CONFIRM] = "CONFIRM", - [DHCP6_RENEW] = "RENEW", - [DHCP6_REBIND] = "REBIND", - [DHCP6_REPLY] = "REPLY", - [DHCP6_RELEASE] = "RELEASE", - [DHCP6_DECLINE] = "DECLINE", - [DHCP6_RECONFIGURE] = "RECONFIGURE", - [DHCP6_INFORMATION_REQUEST] = "INFORMATION-REQUEST", - [DHCP6_RELAY_FORW] = "RELAY-FORW", - [DHCP6_RELAY_REPL] = "RELAY-REPL", -}; - -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", -}; - -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, enum 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 >= -1, -EINVAL); - assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY); - - client->ifindex = ifindex; - 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(in_addr_is_link_local(AF_INET6, (const union in_addr_union *) local_address) > 0, -EINVAL); - - assert_return(IN_SET(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 > 0 && addr_len <= MAX_MAC_ADDR_LEN, -EINVAL); - assert_return(arp_type > 0, -EINVAL); - - assert_return(IN_SET(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 - return -EINVAL; - - if (client->mac_addr_len == addr_len && - memcmp(&client->mac_addr, addr, 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; -} - -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. - */ -int sd_dhcp6_client_set_duid( - sd_dhcp6_client *client, - uint16_t duid_type, - const void *duid, - size_t duid_len) { - - int r; - assert_return(client, -EINVAL); - assert_return(duid_len == 0 || duid != NULL, -EINVAL); - assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY); - - if (duid != NULL) { - r = dhcp_validate_duid_len(duid_type, duid_len); - if (r < 0) - return r; - } - - if (duid != NULL) { - client->duid.type = htobe16(duid_type); - memcpy(&client->duid.raw.data, duid, duid_len); - client->duid_len = sizeof(client->duid.type) + duid_len; - } else if (duid_type == DUID_TYPE_EN) { - r = dhcp_identifier_set_duid_en(&client->duid, &client->duid_len); - if (r < 0) - return r; - } else - return -EOPNOTSUPP; - - return 0; -} - -int sd_dhcp6_client_set_iaid(sd_dhcp6_client *client, uint32_t iaid) { - assert_return(client, -EINVAL); - assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY); - - client->ia_na.id = htobe32(iaid); - - return 0; -} - -int sd_dhcp6_client_set_information_request(sd_dhcp6_client *client, int enabled) { - assert_return(client, -EINVAL); - assert_return(IN_SET(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); - - switch(option) { - - case SD_DHCP6_OPTION_DNS_SERVERS: - case SD_DHCP6_OPTION_DOMAIN_LIST: - case SD_DHCP6_OPTION_SNTP_SERVERS: - case SD_DHCP6_OPTION_NTP_SERVER: - break; - - default: - 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_allocated, - client->req_opts_len + 1)) - return -ENOMEM; - - client->req_opts[client->req_opts_len++] = htobe16(option); - - 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; -} - -static void client_notify(sd_dhcp6_client *client, int event) { - assert(client); - - if (client->callback) - client->callback(client, event, client->userdata); -} - -static void client_set_lease(sd_dhcp6_client *client, sd_dhcp6_lease *lease) { - assert(client); - - if (client->lease) { - dhcp6_lease_clear_timers(&client->lease->ia); - sd_dhcp6_lease_unref(client->lease); - } - - client->lease = lease; -} - -static int client_reset(sd_dhcp6_client *client) { - assert(client); - - client_set_lease(client, NULL); - - client->receive_message = - sd_event_source_unref(client->receive_message); - - client->fd = safe_close(client->fd); - - client->transaction_id = 0; - client->transaction_start = 0; - - client->ia_na.timeout_t1 = - sd_event_source_unref(client->ia_na.timeout_t1); - client->ia_na.timeout_t2 = - sd_event_source_unref(client->ia_na.timeout_t2); - - client->retransmit_time = 0; - client->retransmit_count = 0; - client->timeout_resend = sd_event_source_unref(client->timeout_resend); - client->timeout_resend_expire = - sd_event_source_unref(client->timeout_resend_expire); - - 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_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; - size_t len, optlen = 512; - uint8_t *opt; - int r; - usec_t elapsed_usec; - be16_t elapsed_time; - - assert(client); - - len = sizeof(DHCP6Message) + optlen; - - message = malloc0(len); - if (!message) - return -ENOMEM; - - opt = (uint8_t *)(message + 1); - - message->transaction_id = client->transaction_id; - - switch(client->state) { - case DHCP6_STATE_INFORMATION_REQUEST: - message->type = DHCP6_INFORMATION_REQUEST; - - break; - - case DHCP6_STATE_SOLICITATION: - message->type = DHCP6_SOLICIT; - - r = dhcp6_option_append(&opt, &optlen, - SD_DHCP6_OPTION_RAPID_COMMIT, 0, NULL); - if (r < 0) - return r; - - r = dhcp6_option_append_ia(&opt, &optlen, &client->ia_na); - if (r < 0) - return r; - - break; - - case DHCP6_STATE_REQUEST: - case DHCP6_STATE_RENEW: - - if (client->state == DHCP6_STATE_REQUEST) - message->type = DHCP6_REQUEST; - else - message->type = DHCP6_RENEW; - - r = dhcp6_option_append(&opt, &optlen, SD_DHCP6_OPTION_SERVERID, - client->lease->serverid_len, - client->lease->serverid); - if (r < 0) - return r; - - r = dhcp6_option_append_ia(&opt, &optlen, &client->lease->ia); - if (r < 0) - return r; - - break; - - case DHCP6_STATE_REBIND: - message->type = DHCP6_REBIND; - - r = dhcp6_option_append_ia(&opt, &optlen, &client->lease->ia); - if (r < 0) - return r; - - break; - - case DHCP6_STATE_STOPPED: - case DHCP6_STATE_BOUND: - return -EINVAL; - } - - 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; - - elapsed_usec = time_now - client->transaction_start; - if (elapsed_usec < 0xffff * USEC_PER_MSEC * 10) - elapsed_time = htobe16(elapsed_usec / USEC_PER_MSEC / 10); - else - elapsed_time = 0xffff; - - r = dhcp6_option_append(&opt, &optlen, 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, 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); - - client->lease->ia.timeout_t2 = - sd_event_source_unref(client->lease->ia.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); - - client->lease->ia.timeout_t1 = - sd_event_source_unref(client->lease->ia.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); - enum 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 - val / 10 + - (random_u32() % (2 * 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; - char time_string[FORMAT_TIMESPAN_MAX]; - uint32_t expire = 0; - - assert(s); - assert(client); - assert(client->event); - - client->timeout_resend = sd_event_source_unref(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 && 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 (!client->timeout_resend_expire) { - r = dhcp6_lease_ia_rebind_expire(&client->lease->ia, - &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; - } - - if (max_retransmit_count && - 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) { - 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 (max_retransmit_time && - 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(time_string, FORMAT_TIMESPAN_MAX, client->retransmit_time, USEC_PER_SEC)); - - r = sd_event_add_time(client->event, &client->timeout_resend, - clock_boottime_or_monotonic(), - time_now + client->retransmit_time, - 10 * USEC_PER_MSEC, client_timeout_resend, - client); - if (r < 0) - goto error; - - r = sd_event_source_set_priority(client->timeout_resend, - client->event_priority); - if (r < 0) - goto error; - - r = sd_event_source_set_description(client->timeout_resend, "dhcp6-resend-timer"); - if (r < 0) - goto error; - - if (max_retransmit_duration && !client->timeout_resend_expire) { - - log_dhcp6_client(client, "Max retransmission duration %"PRIu64" secs", - max_retransmit_duration / USEC_PER_SEC); - - r = sd_event_add_time(client->event, - &client->timeout_resend_expire, - clock_boottime_or_monotonic(), - time_now + max_retransmit_duration, - USEC_PER_SEC, - client_timeout_resend_expire, client); - if (r < 0) - goto error; - - r = sd_event_source_set_priority(client->timeout_resend_expire, - client->event_priority); - if (r < 0) - goto error; - - r = sd_event_source_set_description(client->timeout_resend_expire, "dhcp6-resend-expire-timer"); - 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; - - assert(client); - - if (client->ia_na.id) - return 0; - - r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, client->mac_addr_len, &client->ia_na.id); - if (r < 0) - return r; - - return 0; -} - -static int client_parse_message( - sd_dhcp6_client *client, - DHCP6Message *message, - size_t len, - sd_dhcp6_lease *lease) { - int r; - uint8_t *optval, *option, *id = NULL; - uint16_t optcode, status; - size_t optlen, id_len; - bool clientid = false; - be32_t iaid_lease; - - assert(client); - assert(message); - assert(len >= sizeof(DHCP6Message)); - assert(lease); - - option = (uint8_t *)message + sizeof(DHCP6Message); - len -= sizeof(DHCP6Message); - - while ((r = dhcp6_option_parse(&option, &len, &optcode, &optlen, - &optval)) >= 0) { - switch (optcode) { - case SD_DHCP6_OPTION_CLIENTID: - if (clientid) { - log_dhcp6_client(client, "%s contains multiple clientids", - dhcp6_message_type_to_string(message->type)); - return -EINVAL; - } - - if (optlen != client->duid_len || - memcmp(&client->duid, optval, optlen) != 0) { - log_dhcp6_client(client, "%s DUID does not match", - dhcp6_message_type_to_string(message->type)); - - return -EINVAL; - } - clientid = true; - - break; - - case SD_DHCP6_OPTION_SERVERID: - r = dhcp6_lease_get_serverid(lease, &id, &id_len); - if (r >= 0 && id) { - log_dhcp6_client(client, "%s contains multiple serverids", - dhcp6_message_type_to_string(message->type)); - return -EINVAL; - } - - 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); - if (r < 0) - return r; - - break; - - case SD_DHCP6_OPTION_STATUS_CODE: - if (optlen < 2) - return -EINVAL; - - status = optval[0] << 8 | optval[1]; - if (status) { - log_dhcp6_client(client, "%s Status %s", - dhcp6_message_type_to_string(message->type), - dhcp6_message_status_to_string(status)); - return -EINVAL; - } - - break; - - case SD_DHCP6_OPTION_IA_NA: - if (client->state == DHCP6_STATE_INFORMATION_REQUEST) { - log_dhcp6_client(client, "Information request ignoring IA NA option"); - - break; - } - - r = dhcp6_option_parse_ia(&optval, &optlen, optcode, - &lease->ia); - if (r < 0 && r != -ENOMSG) - return r; - - r = dhcp6_lease_get_iaid(lease, &iaid_lease); - if (r < 0) - return r; - - if (client->ia_na.id != iaid_lease) { - log_dhcp6_client(client, "%s has wrong IAID", - dhcp6_message_type_to_string(message->type)); - return -EINVAL; - } - - 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_set_dns(lease, optval, optlen); - if (r < 0) - return r; - - break; - - case SD_DHCP6_OPTION_DOMAIN_LIST: - r = dhcp6_lease_set_domains(lease, optval, optlen); - if (r < 0) - return r; - - break; - - case SD_DHCP6_OPTION_NTP_SERVER: - r = dhcp6_lease_set_ntp(lease, optval, optlen); - if (r < 0) - return r; - - break; - - case SD_DHCP6_OPTION_SNTP_SERVERS: - r = dhcp6_lease_set_sntp(lease, optval, optlen); - if (r < 0) - return r; - - break; - } - - } - - if (r == -ENOMSG) - r = 0; - - if (r < 0 || !clientid) { - log_dhcp6_client(client, "%s has incomplete options", - dhcp6_message_type_to_string(message->type)); - return -EINVAL; - } - - if (client->state != DHCP6_STATE_INFORMATION_REQUEST) { - r = dhcp6_lease_get_serverid(lease, &id, &id_len); - if (r < 0) - log_dhcp6_client(client, "%s has no server id", - dhcp6_message_type_to_string(message->type)); - } - - return r; -} - -static int client_receive_reply(sd_dhcp6_client *client, DHCP6Message *reply, size_t len) { - _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; - bool rapid_commit; - int r; - - assert(client); - assert(reply); - - if (reply->type != DHCP6_REPLY) - return 0; - - r = dhcp6_lease_new(&lease); - if (r < 0) - return -ENOMEM; - - 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; - } - - client_set_lease(client, lease); - lease = NULL; - - return DHCP6_STATE_BOUND; -} - -static int client_receive_advertise(sd_dhcp6_client *client, DHCP6Message *advertise, size_t len) { - _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; - uint8_t pref_advertise = 0, pref_lease = 0; - int r; - - if (advertise->type != DHCP6_ADVERTISE) - return 0; - - r = dhcp6_lease_new(&lease); - if (r < 0) - return r; - - 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; - - r = dhcp6_lease_get_preference(client->lease, &pref_lease); - - if (r < 0 || pref_advertise > pref_lease) { - client_set_lease(client, lease); - lease = NULL; - 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); - _cleanup_free_ DHCP6Message *message = NULL; - ssize_t buflen, len; - int r = 0; - - assert(s); - assert(client); - assert(client->event); - - buflen = next_datagram_size_fd(fd); - if (buflen < 0) - return buflen; - - message = malloc(buflen); - if (!message) - return -ENOMEM; - - len = recv(fd, message, buflen, 0); - if (len < 0) { - if (errno == EAGAIN || errno == EINTR) - return 0; - - return log_dhcp6_client_errno(client, errno, "Could not receive message from UDP socket: %m"); - - } - if ((size_t) len < sizeof(DHCP6Message)) { - log_dhcp6_client(client, "Too small to be DHCP6 message: ignoring"); - return 0; - } - - switch(message->type) { - case DHCP6_SOLICIT: - case DHCP6_REQUEST: - case DHCP6_CONFIRM: - case DHCP6_RENEW: - case DHCP6_REBIND: - case DHCP6_RELEASE: - case DHCP6_DECLINE: - case DHCP6_INFORMATION_REQUEST: - case DHCP6_RELAY_FORW: - case DHCP6_RELAY_REPL: - return 0; - - case DHCP6_ADVERTISE: - case DHCP6_REPLY: - case DHCP6_RECONFIGURE: - break; - - default: - log_dhcp6_client(client, "Unknown message type %d", 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); - if (r < 0) - 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); - - if (r == DHCP6_STATE_REQUEST) { - client_start(client, r); - - break; - } - - /* fall through for Soliciation Rapid Commit option check */ - case DHCP6_STATE_REQUEST: - case DHCP6_STATE_RENEW: - case DHCP6_STATE_REBIND: - - r = client_receive_reply(client, message, len); - if (r < 0) - 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; - } - - if (r >= 0) - log_dhcp6_client(client, "Recv %s", - dhcp6_message_type_to_string(message->type)); - - return 0; -} - -static int client_start(sd_dhcp6_client *client, enum DHCP6State state) { - int r; - usec_t timeout, time_now; - char time_string[FORMAT_TIMESPAN_MAX]; - - assert_return(client, -EINVAL); - assert_return(client->event, -EINVAL); - assert_return(client->ifindex > 0, -EINVAL); - assert_return(client->state != state, -EINVAL); - - client->timeout_resend_expire = - sd_event_source_unref(client->timeout_resend_expire); - client->timeout_resend = sd_event_source_unref(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; - - switch (state) { - case DHCP6_STATE_STOPPED: - if (client->state == DHCP6_STATE_INFORMATION_REQUEST) { - client->state = DHCP6_STATE_STOPPED; - - return 0; - } - - /* fall through */ - 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: - - if (client->lease->ia.lifetime_t1 == 0xffffffff || - client->lease->ia.lifetime_t2 == 0xffffffff) { - - log_dhcp6_client(client, "Infinite T1 0x%08x or T2 0x%08x", - be32toh(client->lease->ia.lifetime_t1), - be32toh(client->lease->ia.lifetime_t2)); - - return 0; - } - - timeout = client_timeout_compute_random(be32toh(client->lease->ia.lifetime_t1) * USEC_PER_SEC); - - log_dhcp6_client(client, "T1 expires in %s", - format_timespan(time_string, FORMAT_TIMESPAN_MAX, timeout, USEC_PER_SEC)); - - r = sd_event_add_time(client->event, - &client->lease->ia.timeout_t1, - clock_boottime_or_monotonic(), time_now + timeout, - 10 * USEC_PER_SEC, client_timeout_t1, - client); - if (r < 0) - return r; - - r = sd_event_source_set_priority(client->lease->ia.timeout_t1, - client->event_priority); - if (r < 0) - return r; - - r = sd_event_source_set_description(client->lease->ia.timeout_t1, "dhcp6-t1-timeout"); - if (r < 0) - return r; - - timeout = client_timeout_compute_random(be32toh(client->lease->ia.lifetime_t2) * USEC_PER_SEC); - - log_dhcp6_client(client, "T2 expires in %s", - format_timespan(time_string, FORMAT_TIMESPAN_MAX, timeout, USEC_PER_SEC)); - - r = sd_event_add_time(client->event, - &client->lease->ia.timeout_t2, - clock_boottime_or_monotonic(), time_now + timeout, - 10 * USEC_PER_SEC, client_timeout_t2, - client); - if (r < 0) - return r; - - r = sd_event_source_set_priority(client->lease->ia.timeout_t2, - client->event_priority); - if (r < 0) - return r; - - r = sd_event_source_set_description(client->lease->ia.timeout_t2, "dhcp6-t2-timeout"); - if (r < 0) - return r; - - client->state = state; - - return 0; - } - - client->transaction_id = random_u32() & htobe32(0x00ffffff); - client->transaction_start = time_now; - - r = sd_event_add_time(client->event, &client->timeout_resend, - clock_boottime_or_monotonic(), 0, 0, client_timeout_resend, - client); - if (r < 0) - return r; - - r = sd_event_source_set_priority(client->timeout_resend, - client->event_priority); - if (r < 0) - return r; - - r = sd_event_source_set_description(client->timeout_resend, "dhcp6-resend-timeout"); - if (r < 0) - return r; - - return 0; -} - -int sd_dhcp6_client_stop(sd_dhcp6_client *client) { - assert_return(client, -EINVAL); - - client_stop(client, SD_DHCP6_CLIENT_EVENT_STOP); - - 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) { - enum DHCP6State state = DHCP6_STATE_SOLICITATION; - int r = 0; - - assert_return(client, -EINVAL); - assert_return(client->event, -EINVAL); - assert_return(client->ifindex > 0, -EINVAL); - assert_return(in_addr_is_link_local(AF_INET6, (const union in_addr_union *) &client->local_address) > 0, -EINVAL); - - if (!IN_SET(client->state, DHCP6_STATE_STOPPED)) - return -EBUSY; - - 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; - - 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; - - 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; - - if (client->information_request) - state = DHCP6_STATE_INFORMATION_REQUEST; - - log_dhcp6_client(client, "Started in %s mode", - client->information_request? "Information request": - "Managed"); - - return client_start(client, state); - -error: - client_reset(client); - return r; -} - -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; -} - -sd_dhcp6_client *sd_dhcp6_client_ref(sd_dhcp6_client *client) { - - if (!client) - return NULL; - - assert(client->n_ref >= 1); - client->n_ref++; - - return client; -} - -sd_dhcp6_client *sd_dhcp6_client_unref(sd_dhcp6_client *client) { - - if (!client) - return NULL; - - assert(client->n_ref >= 1); - client->n_ref--; - - if (client->n_ref > 0) - return NULL; - - client_reset(client); - - sd_dhcp6_client_detach_event(client); - - free(client->req_opts); - return mfree(client); -} - -int sd_dhcp6_client_new(sd_dhcp6_client **ret) { - _cleanup_(sd_dhcp6_client_unrefp) sd_dhcp6_client *client = NULL; - size_t t; - - assert_return(ret, -EINVAL); - - client = new0(sd_dhcp6_client, 1); - if (!client) - return -ENOMEM; - - client->n_ref = 1; - client->ia_na.type = SD_DHCP6_OPTION_IA_NA; - client->ifindex = -1; - client->fd = -1; - - client->req_opts_len = ELEMENTSOF(default_req_opts); - client->req_opts = new0(be16_t, client->req_opts_len); - if (!client->req_opts) - return -ENOMEM; - - for (t = 0; t < client->req_opts_len; t++) - client->req_opts[t] = htobe16(default_req_opts[t]); - - *ret = client; - client = NULL; - - return 0; -} |