#include <errno.h>
#include <string.h>
+#include <sys/ioctl.h>
+#include <linux/if_infiniband.h>
#include "udev.h"
#include "udev-util.h"
-#include "virt.h"
-#include "siphash24.h"
#include "util.h"
#include "refcnt.h"
#include "sd-dhcp6-client.h"
#include "dhcp6-protocol.h"
#include "dhcp6-internal.h"
+#include "dhcp6-lease-internal.h"
+#include "dhcp-identifier.h"
-#define SYSTEMD_PEN 43793
-#define HASH_KEY SD_ID128_MAKE(80,11,8c,c2,fe,4a,03,ee,3e,d6,0c,6f,36,39,14,09)
+#define MAX_MAC_ADDR_LEN INFINIBAND_ALEN
struct sd_dhcp6_client {
RefCount n_ref;
sd_event *event;
int event_priority;
int index;
- struct ether_addr mac_addr;
+ 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_cb_t cb;
void *userdata;
+ struct duid duid;
+ size_t duid_len;
+};
+
+static const uint16_t default_req_opts[] = {
+ DHCP6_OPTION_DNS_SERVERS,
+ DHCP6_OPTION_DOMAIN_LIST,
+ DHCP6_OPTION_NTP_SERVER,
+};
+
+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);
- struct duid_en {
- uint16_t type; /* DHCP6_DUID_EN */
- uint32_t pen;
- uint8_t id[8];
- } _packed_ duid;
+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_TRIVIAL_CLEANUP_FUNC(sd_dhcp6_client*, sd_dhcp6_client_unref);
+#define _cleanup_dhcp6_client_unref_ _cleanup_(sd_dhcp6_client_unrefp)
+
+#define DHCP6_CLIENT_DONT_DESTROY(client) \
+ _cleanup_dhcp6_client_unref_ _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_cb_t cb, void *userdata)
{
return 0;
}
-int sd_dhcp6_client_set_mac(sd_dhcp6_client *client,
- const struct ether_addr *mac_addr)
+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);
-
- if (mac_addr)
- memcpy(&client->mac_addr, mac_addr, sizeof(client->mac_addr));
+ assert_return(addr, -EINVAL);
+ assert_return(addr_len > 0 && addr_len <= MAX_MAC_ADDR_LEN, -EINVAL);
+ assert_return(arp_type > 0, -EINVAL);
+
+ 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
- memset(&client->mac_addr, 0x00, sizeof(client->mac_addr));
+ 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 sd_dhcp6_client *client_notify(sd_dhcp6_client *client, int event) {
- if (client->cb) {
- client = sd_dhcp6_client_ref(client);
- client->cb(client, event, client->userdata);
- client = sd_dhcp6_client_unref(client);
+int sd_dhcp6_client_set_duid(sd_dhcp6_client *client, uint16_t type, uint8_t *duid,
+ size_t duid_len)
+{
+ assert_return(client, -EINVAL);
+ assert_return(duid, -EINVAL);
+ assert_return(duid_len > 0 && duid_len <= MAX_DUID_LEN, -EINVAL);
+
+ switch (type) {
+ case DHCP6_DUID_LLT:
+ if (duid_len <= sizeof(client->duid.llt))
+ return -EINVAL;
+ break;
+ case DHCP6_DUID_EN:
+ if (duid_len != sizeof(client->duid.en))
+ return -EINVAL;
+ break;
+ case DHCP6_DUID_LL:
+ if (duid_len <= sizeof(client->duid.ll))
+ return -EINVAL;
+ break;
+ case DHCP6_DUID_UUID:
+ if (duid_len != sizeof(client->duid.uuid))
+ return -EINVAL;
+ break;
+ default:
+ /* accept unknown type in order to be forward compatible */
+ break;
}
- return client;
+ client->duid.type = htobe16(type);
+ memcpy(&client->duid.raw.data, duid, duid_len);
+ client->duid_len = duid_len + sizeof(client->duid.type);
+
+ return 0;
}
-static int client_initialize(sd_dhcp6_client *client)
-{
+int sd_dhcp6_client_set_information_request(sd_dhcp6_client *client,
+ bool enabled) {
+ assert_return(client, -EINVAL);
+
+ client->information_request = enabled;
+
+ return 0;
+}
+
+int sd_dhcp6_client_get_information_request(sd_dhcp6_client *client,
+ bool *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 DHCP6_OPTION_DNS_SERVERS:
+ case DHCP6_OPTION_DOMAIN_LIST:
+ case DHCP6_OPTION_SNTP_SERVERS:
+ case 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);
+ assert_return(ret, -EINVAL);
+
+ if (!client->lease)
+ return -ENOMSG;
+
+ *ret = sd_dhcp6_lease_ref(client->lease);
+
+ return 0;
+}
+
+static void client_notify(sd_dhcp6_client *client, int event) {
+ if (client->cb)
+ client->cb(client, event, client->userdata);
+}
+
+static int client_reset(sd_dhcp6_client *client) {
+ assert_return(client, -EINVAL);
+
+ 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);
return 0;
}
-static sd_dhcp6_client *client_stop(sd_dhcp6_client *client, int error) {
- assert_return(client, NULL);
+static void client_stop(sd_dhcp6_client *client, int error) {
+ DHCP6_CLIENT_DONT_DESTROY(client);
- client = client_notify(client, error);
- if (client)
- client_initialize(client);
+ assert(client);
- return 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;
+
+ 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,
+ 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, 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, DHCP6_OPTION_ORO,
+ client->req_opts_len * sizeof(be16_t),
+ client->req_opts);
+ if (r < 0)
+ return r;
+
+ r = dhcp6_option_append(&opt, &optlen, 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, 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_return(s, -EINVAL);
+ assert_return(client, -EINVAL);
+ assert_return(client->lease, -EINVAL);
+
+ 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_return(s, -EINVAL);
+ assert_return(client, -EINVAL);
+ assert_return(client->lease, -EINVAL);
+
+ 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, DHCP6_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;
}
void *userdata) {
int r = 0;
sd_dhcp6_client *client = userdata;
- usec_t time_now, init_retransmit_time, max_retransmit_time;
- usec_t max_retransmit_duration;
- uint8_t max_retransmit_count;
+ 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);
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;
- max_retransmit_count = 0;
- max_retransmit_duration = 0;
+
+ 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_RS:
+ case DHCP6_STATE_BOUND:
return 0;
}
return 0;
}
- r = sd_event_now(client->event, CLOCK_MONOTONIC, &time_now);
+ 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, 0));
r = sd_event_add_time(client->event, &client->timeout_resend,
- CLOCK_MONOTONIC,
+ 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_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",
r = sd_event_add_time(client->event,
&client->timeout_resend_expire,
- CLOCK_MONOTONIC,
+ clock_boottime_or_monotonic(),
time_now + max_retransmit_duration,
USEC_PER_SEC,
client_timeout_resend_expire, client);
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:
}
static int client_ensure_iaid(sd_dhcp6_client *client) {
- const char *name = NULL;
- uint64_t id;
+ int r;
assert(client);
if (client->ia_na.id)
return 0;
- if (detect_container(NULL) <= 0) {
- /* not in a container, udev will be around */
- _cleanup_udev_unref_ struct udev *udev;
- _cleanup_udev_device_unref_ struct udev_device *device;
- char ifindex_str[2 + DECIMAL_STR_MAX(int)];
+ r = dhcp_identifier_set_iaid(client->index, client->mac_addr, client->mac_addr_len, &client->ia_na.id);
+ if (r < 0)
+ return r;
- udev = udev_new();
- if (!udev)
- return -ENOMEM;
+ return 0;
+}
- sprintf(ifindex_str, "n%d", client->index);
- device = udev_device_new_from_device_id(udev, ifindex_str);
- if (!device)
- return -errno;
+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;
+
+ option = (uint8_t *)message + sizeof(DHCP6Message);
+ len -= sizeof(DHCP6Message);
+
+ while ((r = dhcp6_option_parse(&option, &len, &optcode, &optlen,
+ &optval)) >= 0) {
+ switch (optcode) {
+ case 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 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 DHCP6_OPTION_PREFERENCE:
+ if (optlen != 1)
+ return -EINVAL;
+
+ r = dhcp6_lease_set_preference(lease, *optval);
+ if (r < 0)
+ return r;
+
+ break;
+
+ case 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 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 DHCP6_OPTION_RAPID_COMMIT:
+ r = dhcp6_lease_set_rapid_commit(lease);
+ if (r < 0)
+ return r;
+
+ break;
+ }
+ }
- if (udev_device_get_is_initialized(device) <= 0)
- /* not yet ready */
- return -EBUSY;
+ if (r == -ENOMSG)
+ r = 0;
- name = net_get_name(device);
+ if (r < 0 || !clientid) {
+ log_dhcp6_client(client, "%s has incomplete options",
+ dhcp6_message_type_to_string(message->type));
+ return -EINVAL;
}
- if (name)
- siphash24((uint8_t*)&id, name, strlen(name), HASH_KEY.bytes);
- else
- /* fall back to mac address if no predictable name available */
- siphash24((uint8_t*)&id, &client->mac_addr, ETH_ALEN,
- HASH_KEY.bytes);
+ 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)
+{
+ int r;
+ _cleanup_dhcp6_lease_free_ sd_dhcp6_lease *lease = NULL;
+ bool rapid_commit;
+
+ 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;
+ }
+
+ if (client->lease) {
+ dhcp6_lease_clear_timers(&client->lease->ia);
+ client->lease = sd_dhcp6_lease_unref(client->lease);
+ }
+
+ if (client->state != DHCP6_STATE_INFORMATION_REQUEST) {
+ client->lease = lease;
+ lease = NULL;
+ }
+
+ return DHCP6_STATE_BOUND;
+}
+
+static int client_receive_advertise(sd_dhcp6_client *client,
+ DHCP6Message *advertise, size_t len) {
+ int r;
+ _cleanup_dhcp6_lease_free_ sd_dhcp6_lease *lease = NULL;
+ uint8_t pref_advertise = 0, pref_lease = 0;
+
+ if (advertise->type != DHCP6_ADVERTISE)
+ return 0;
+
+ r = dhcp6_lease_new(&lease);
+ if (r < 0)
+ return r;
- /* fold into 32 bits */
- client->ia_na.id = (id & 0xffffffff) ^ (id >> 32);
+ 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) {
+ sd_dhcp6_lease_unref(client->lease);
+ client->lease = 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;
+ int r, buflen, len;
+
+ assert(s);
+ assert(client);
+ assert(client->event);
+
+ r = ioctl(fd, FIONREAD, &buflen);
+ if (r < 0 || buflen <= 0)
+ buflen = DHCP6_MIN_OPTIONS_SIZE;
+
+ message = malloc0(buflen);
+ if (!message)
+ return -ENOMEM;
+
+ len = read(fd, message, buflen);
+ if ((size_t)len < sizeof(DHCP6Message)) {
+ log_dhcp6_client(client, "could not receive message from UDP socket: %m");
+ 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, DHCP6_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, DHCP6_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)
+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->index > 0, -EINVAL);
+ assert_return(client->state != state, -EINVAL);
- r = client_ensure_iaid(client);
- if (r < 0)
- return r;
+ 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;
+
+ if (client->state == DHCP6_STATE_STOPPED) {
+ time_now = now(clock_boottime_or_monotonic());
+ } else {
+ 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, 0));
+
+ 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);
- client->state = DHCP6_STATE_SOLICITATION;
+ log_dhcp6_client(client, "T2 expires in %s",
+ format_timespan(time_string,
+ FORMAT_TIMESPAN_MAX,
+ timeout, 0));
+
+ 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_MONOTONIC, 0, 0, client_timeout_resend,
+ clock_boottime_or_monotonic(), 0, 0, client_timeout_resend,
client);
if (r < 0)
return r;
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_start(sd_dhcp6_client *client)
{
int r = 0;
+ enum DHCP6State state = DHCP6_STATE_SOLICITATION;
assert_return(client, -EINVAL);
assert_return(client->event, -EINVAL);
assert_return(client->index > 0, -EINVAL);
- r = client_initialize(client);
+ r = client_reset(client);
+ if (r < 0)
+ return r;
+
+ r = client_ensure_iaid(client);
+ if (r < 0)
+ return r;
+
+ r = dhcp6_network_bind_udp_socket(client->index, NULL);
if (r < 0)
return r;
- return client_start(client);
+ 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,
}
sd_dhcp6_client *sd_dhcp6_client_unref(sd_dhcp6_client *client) {
- if (client && REFCNT_DEC(client->n_ref) <= 0) {
- client_initialize(client);
+ if (client && REFCNT_DEC(client->n_ref) == 0) {
+ client_reset(client);
sd_dhcp6_client_detach_event(client);
+ free(client->req_opts);
free(client);
return NULL;
return client;
}
-DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp6_client*, sd_dhcp6_client_unref);
-#define _cleanup_dhcp6_client_free_ _cleanup_(sd_dhcp6_client_unrefp)
-
int sd_dhcp6_client_new(sd_dhcp6_client **ret)
{
- _cleanup_dhcp6_client_free_ sd_dhcp6_client *client = NULL;
- sd_id128_t machine_id;
+ _cleanup_dhcp6_client_unref_ sd_dhcp6_client *client = NULL;
int r;
+ size_t t;
assert_return(ret, -EINVAL);
client->index = -1;
- /* initialize DUID */
- client->duid.type = htobe16(DHCP6_DUID_EN);
- client->duid.pen = htobe32(SYSTEMD_PEN);
+ client->fd = -1;
- r = sd_id128_get_machine(&machine_id);
+ /* initialize DUID */
+ r = dhcp_identifier_set_duid_en(&client->duid, &client->duid_len);
if (r < 0)
return r;
- /* a bit of snake-oil perhaps, but no need to expose the machine-id
- directly */
- siphash24(client->duid.id, &machine_id, sizeof(machine_id),
- HASH_KEY.bytes);
+ 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;
~ianmdlvl / elogind.git / blobdiff