be32_t transaction_id;
struct sd_dhcp6_lease *lease;
int fd;
+ 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;
} _packed_ duid;
};
+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",
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,
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);
return 0;
}
-static sd_dhcp6_client *client_notify(sd_dhcp6_client *client, int event) {
- if (client->cb) {
- client = sd_dhcp6_client_ref(client);
+static void client_notify(sd_dhcp6_client *client, int event) {
+ if (client->cb)
client->cb(client, event, client->userdata);
- client = sd_dhcp6_client_unref(client);
- }
-
- return client;
}
-static int client_initialize(sd_dhcp6_client *client)
-{
+static int client_reset(sd_dhcp6_client *client) {
assert_return(client, -EINVAL);
client->receive_message =
sd_event_source_unref(client->receive_message);
- if (client->fd > 0)
- client->fd = safe_close(client->fd);
+ client->fd = safe_close(client->fd);
client->transaction_id = 0;
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) {
case DHCP6_STATE_SOLICITATION:
message->type = DHCP6_SOLICIT;
- r = dhcp6_option_append(&opt, &optlen, DHCP6_OPTION_CLIENTID,
- sizeof(client->duid), &client->duid);
+ r = dhcp6_option_append(&opt, &optlen,
+ DHCP6_OPTION_RAPID_COMMIT, 0, NULL);
+
+ r = dhcp6_option_append_ia(&opt, &optlen, &client->ia_na);
if (r < 0)
return r;
- r = dhcp6_option_append_ia(&opt, &optlen, &client->ia_na);
+ 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;
case DHCP6_STATE_STOPPED:
case DHCP6_STATE_RS:
+ 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,
+ sizeof(client->duid), &client->duid);
+ if (r < 0)
+ return r;
+
r = dhcp6_network_send_udp_socket(client->fd, &all_servers, message,
len - optlen);
if (r < 0)
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;
}
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;
+ uint8_t max_retransmit_count = 0;
char time_string[FORMAT_TIMESPAN_MAX];
+ uint32_t expire = 0;
assert(s);
assert(client);
switch (client->state) {
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;
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;
+ max_retransmit_duration = 0;
+
+ break;
+
+ case DHCP6_STATE_RENEW:
+ init_retransmit_time = DHCP6_REN_TIMEOUT;
+ max_retransmit_time = DHCP6_REN_MAX_RT;
+ max_retransmit_count = 0;
+
+ /* 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 */
+ max_retransmit_duration = 0;
+
+ break;
+
+ case DHCP6_STATE_REBIND:
+ init_retransmit_time = DHCP6_REB_TIMEOUT;
+ max_retransmit_time = DHCP6_REB_MAX_RT;
+ max_retransmit_count = 0;
+
+ max_retransmit_duration = 0;
+
+ 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;
}
}
static int client_ensure_iaid(sd_dhcp6_client *client) {
+ /* name is a pointer to memory in the udev_device struct, so must
+ have the same scope */
+ _cleanup_udev_device_unref_ struct udev_device *device = NULL;
const char *name = NULL;
uint64_t id;
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)];
udev = udev_new();
}
break;
+
+ case DHCP6_OPTION_RAPID_COMMIT:
+ r = dhcp6_lease_set_rapid_commit(lease);
+ if (r < 0)
+ return r;
+
+ break;
}
}
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;
+ }
+
+ dhcp6_lease_clear_timers(&client->lease->ia);
+
+ client->lease = sd_dhcp6_lease_unref(client->lease);
+ 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;
uint8_t pref_advertise = 0, pref_lease = 0;
if (advertise->type != DHCP6_ADVERTISE)
- return -EINVAL;
+ return 0;
r = dhcp6_lease_new(&lease);
if (r < 0)
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;
len = read(fd, message, buflen);
if ((size_t)len < sizeof(DHCP6Message)) {
- log_dhcp6_client(client, "could not receive message from UDP socket: %s", strerror(errno));
+ log_dhcp6_client(client, "could not receive message from UDP socket: %m");
return 0;
}
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:
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);
client->state = DHCP6_STATE_SOLICITATION;
break;
+
+ case DHCP6_STATE_REQUEST:
+ case DHCP6_STATE_RENEW:
+ case DHCP6_STATE_REBIND:
+
+ client->state = state;
+
+ break;
+
+ case DHCP6_STATE_BOUND:
+
+ r = sd_event_now(client->event, CLOCK_MONOTONIC, &time_now);
+ if (r < 0)
+ return r;
+
+ 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_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;
+
+ 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, 0));
+
+ r = sd_event_add_time(client->event,
+ &client->lease->ia.timeout_t2,
+ CLOCK_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;
+
+ client->state = state;
+
+ return 0;
}
client->transaction_id = random_u32() & htobe32(0x00ffffff);
assert_return(client->event, -EINVAL);
assert_return(client->index > 0, -EINVAL);
- r = client_initialize(client);
+ r = client_reset(client);
if (r < 0)
return r;
sd_dhcp6_client *sd_dhcp6_client_unref(sd_dhcp6_client *client) {
if (client && REFCNT_DEC(client->n_ref) <= 0) {
- client_initialize(client);
+ 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;
+ _cleanup_dhcp6_client_unref_ sd_dhcp6_client *client = NULL;
sd_id128_t machine_id;
int r;
+ size_t t;
assert_return(ret, -EINVAL);
client->index = -1;
+ client->fd = -1;
+
/* initialize DUID */
client->duid.type = htobe16(DHCP6_DUID_EN);
client->duid.pen = htobe32(SYSTEMD_PEN);
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