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libsystemd-network: Add Init-Reboot support

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Init-Reboot is tried if a client IP address has been given when
the DHCP client is started. In Init-Reboot, start by sending a
broadcast DHCP Request including the supplied client IP address
but without the server identifier. After sending the request,
enter Reboot state.

If a DHCP Ack is received, proceed to Bound state as usual. If a
DHCP Nak is received or the first timeout triggers, start the
address acquisition over from DHCP Init state.

See RFC 2131, sections 4.3.2, 4.4, 4.4.1 and 4.4.2 for details.
This commit is contained in:
Patrik Flykt 2014-01-31 11:31:22 +02:00
parent 0f941add36
commit 8b1243f72e
1 changed files with 51 additions and 6 deletions
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57
src/libsystemd-network/sd-dhcp-client.c
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@ -338,7 +338,17 @@ static int client_send_request(sd_dhcp_client *client, uint16_t secs) {
if (err < 0)
return err;
if (client->state == DHCP_STATE_REQUESTING) {
switch (client->state) {
case DHCP_STATE_INIT_REBOOT:
err = dhcp_option_append(&opt, &optlen,
DHCP_OPTION_REQUESTED_IP_ADDRESS,
4, &client->last_addr);
if (err < 0)
return err;
break;
case DHCP_STATE_REQUESTING:
err = dhcp_option_append(&opt, &optlen,
DHCP_OPTION_REQUESTED_IP_ADDRESS,
4, &client->lease->address);
@ -350,6 +360,16 @@ static int client_send_request(sd_dhcp_client *client, uint16_t secs) {
4, &client->lease->server_address);
if (err < 0)
return err;
break;
case DHCP_STATE_INIT:
case DHCP_STATE_SELECTING:
case DHCP_STATE_REBOOTING:
case DHCP_STATE_BOUND:
case DHCP_STATE_RENEWING:
case DHCP_STATE_REBINDING:
break;
}
err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
@ -416,9 +436,15 @@ static int client_timeout_resend(sd_event_source *s, uint64_t usec,
next_timeout = time_now + time_left * USEC_PER_SEC;
break;
case DHCP_STATE_REBOOTING:
/* start over as we did not receive a timely ack or nak */
client->state = DHCP_STATE_INIT;
client->attempt = 1;
client->xid = random_u32();
/* fall through */
case DHCP_STATE_INIT:
case DHCP_STATE_INIT_REBOOT:
case DHCP_STATE_REBOOTING:
case DHCP_STATE_SELECTING:
case DHCP_STATE_REQUESTING:
case DHCP_STATE_BOUND:
@ -473,6 +499,7 @@ static int client_timeout_resend(sd_event_source *s, uint64_t usec,
break;
case DHCP_STATE_INIT_REBOOT:
case DHCP_STATE_REQUESTING:
case DHCP_STATE_RENEWING:
case DHCP_STATE_REBINDING:
@ -480,11 +507,13 @@ static int client_timeout_resend(sd_event_source *s, uint64_t usec,
if (r < 0 && client->attempt >= 64)
goto error;
if (client->state == DHCP_STATE_INIT_REBOOT)
client->state = DHCP_STATE_REBOOTING;
client->request_sent = time_now;
break;
case DHCP_STATE_INIT_REBOOT:
case DHCP_STATE_REBOOTING:
case DHCP_STATE_BOUND:
@ -853,20 +882,37 @@ static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message,
break;
case DHCP_STATE_REBOOTING:
case DHCP_STATE_REQUESTING:
case DHCP_STATE_RENEWING:
case DHCP_STATE_REBINDING:
r = client_handle_ack(client, message, len);
if (r == DHCP_EVENT_NO_LEASE)
if (r == DHCP_EVENT_NO_LEASE) {
client->timeout_resend =
sd_event_source_unref(client->timeout_resend);
if (client->state == DHCP_STATE_REBOOTING) {
r = client_initialize(client);
if (r < 0)
goto error;
r = client_start(client);
if (r < 0)
goto error;
}
goto error;
}
if (r >= 0) {
client->timeout_resend =
sd_event_source_unref(client->timeout_resend);
if (client->state == DHCP_STATE_REQUESTING)
if (IN_SET(client->state, DHCP_STATE_REQUESTING,
DHCP_STATE_REBOOTING))
notify_event = DHCP_EVENT_IP_ACQUIRE;
else if (r != DHCP_EVENT_IP_ACQUIRE)
notify_event = r;
@ -894,7 +940,6 @@ static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message,
case DHCP_STATE_INIT:
case DHCP_STATE_INIT_REBOOT:
case DHCP_STATE_REBOOTING:
case DHCP_STATE_BOUND:
break;