udhcpc[6]: when renewing, send 1 packet (not 3), on failure go back to BOUND
This restores old behavior where we slept for 1/2 of lease, then tried renewing, thel slept for 1/4 and tried again, etc. But now we will NOT be listening to all packets for 1/2 of lease time, processing (rejecting) everyone else's DHCP traffic. We'll go back to bound state, where we have no listening socket at all. function old new delta udhcpc6_main 2600 2655 +55 udhcpc_main 2608 2625 +17 .rodata 103250 103249 -1 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/1 up/down: 72/-1) Total: 71 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
01daecca1d
commit
1c7253726f
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@ -1420,7 +1420,7 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
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retval = 1;
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goto ret;
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}
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/* wait before trying again */
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/* Wait before trying again */
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timeout = tryagain_timeout;
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packet_num = 0;
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continue;
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@ -1442,14 +1442,14 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
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/* 1/2 lease passed, enter renewing state */
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client_data.state = RENEWING;
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client_data.first_secs = 0; /* make secs field count from 0 */
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change_listen_mode(LISTEN_KERNEL);
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got_SIGUSR1:
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log1s("entering renew state");
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change_listen_mode(LISTEN_KERNEL);
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/* fall right through */
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case RENEW_REQUESTED: /* manual (SIGUSR1) renew */
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case_RENEW_REQUESTED:
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case RENEW_REQUESTED: /* in manual (SIGUSR1) renew */
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case RENEWING:
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if (packet_num < 3) {
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/* send an unicast renew request */
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if (packet_num == 0) {
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/* Send an unicast renew request */
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/* Sometimes observed to fail (EADDRNOTAVAIL) to bind
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* a new UDP socket for sending inside send_renew.
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* I hazard to guess existing listening socket
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@ -1463,13 +1463,18 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
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else
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send_d6_renew(xid, &srv6_buf, requested_ipv6);
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timeout = discover_timeout;
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/* ^^^ used to be = lease_remaining / 2 - WAY too long */
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packet_num++;
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continue;
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} /* else: we had sent one packet, but got no reply */
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log1s("no response to renew");
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if (lease_remaining > 30) {
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/* Some lease time remains, try to renew later */
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change_listen_mode(LISTEN_NONE);
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goto BOUND_for_half_lease;
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}
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/* Timed out, enter rebinding state */
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log1s("entering rebinding state");
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/* Enter rebinding state */
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client_data.state = REBINDING;
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log1s("entering rebinding state");
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/* Switch to bcast receive */
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change_listen_mode(LISTEN_RAW);
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packet_num = 0;
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@ -1509,8 +1514,14 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
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/* Is it a signal? */
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switch (udhcp_sp_read()) {
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case SIGUSR1:
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if (client_data.state <= REQUESTING)
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/* Initial negotiations in progress, do not disturb */
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break;
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if (lease_remaining > 30) /* if renew fails, do not go back to BOUND */
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lease_remaining = 30;
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client_data.first_secs = 0; /* make secs field count from 0 */
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bb_simple_info_msg("performing DHCP renew");
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packet_num = 0;
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switch (client_data.state) {
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/* Try to renew/rebind */
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@ -1519,21 +1530,19 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
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case REBINDING:
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change_listen_mode(LISTEN_KERNEL);
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client_data.state = RENEW_REQUESTED;
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goto case_RENEW_REQUESTED;
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goto got_SIGUSR1;
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/* Start things over */
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case RENEW_REQUESTED: /* two or more SIGUSR1 received */
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/* Two SIGUSR1 received, start things over */
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case RENEW_REQUESTED:
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change_listen_mode(LISTEN_NONE);
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d6_run_script_no_option("deconfig");
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/* Wake from SIGUSR2-induced deconfigured state */
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default:
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/* case REQUESTING: */
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/* case RELEASED: */
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/* case INIT_SELECTING: */
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change_listen_mode(LISTEN_NONE);
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}
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client_data.state = INIT_SELECTING;
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packet_num = 0;
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/* Kill any timeouts, user wants this to hurry along */
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timeout = 0;
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continue;
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@ -1830,7 +1839,7 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
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}
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#endif
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// BOUND_for_half_lease:
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BOUND_for_half_lease:
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timeout = (unsigned)lease_remaining / 2;
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client_data.state = BOUND;
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packet_num = 0;
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@ -1480,7 +1480,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
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retval = 1;
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goto ret;
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}
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/* wait before trying again */
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/* Wait before trying again */
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timeout = tryagain_timeout;
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packet_num = 0;
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continue;
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@ -1502,14 +1502,14 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
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/* 1/2 lease passed, enter renewing state */
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client_data.state = RENEWING;
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client_data.first_secs = 0; /* make secs field count from 0 */
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change_listen_mode(LISTEN_KERNEL);
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got_SIGUSR1:
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log1s("entering renew state");
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change_listen_mode(LISTEN_KERNEL);
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/* fall right through */
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case RENEW_REQUESTED: /* manual (SIGUSR1) renew */
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case_RENEW_REQUESTED:
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case RENEW_REQUESTED: /* in manual (SIGUSR1) renew */
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case RENEWING:
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if (packet_num < 3) {
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/* send an unicast renew request */
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if (packet_num == 0) {
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/* Send an unicast renew request */
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/* Sometimes observed to fail (EADDRNOTAVAIL) to bind
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* a new UDP socket for sending inside send_renew.
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* I hazard to guess existing listening socket
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@ -1520,7 +1520,6 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
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*/
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if (send_renew(xid, server_addr, requested_ip) >= 0) {
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timeout = discover_timeout;
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/* ^^^ used to be = lease_remaining / 2 - WAY too long */
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packet_num++;
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continue;
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}
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@ -1529,15 +1528,16 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
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* which gave us bogus server ID 1.1.1.1
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* which wasn't reachable (and probably did not exist).
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*/
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} /* else: we had sent one packet, but got no reply */
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log1s("no response to renew");
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if (lease_remaining > 30) {
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/* Some lease time remains, try to renew later */
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change_listen_mode(LISTEN_NONE);
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goto BOUND_for_half_lease;
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}
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//TODO: if 3 renew's failed (no reply) but remaining lease is large enough,
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//it might make sense to go back to BOUND and try later? a-la
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// if (lease_remaining > 30) change_listen_mode(LISTEN_NONE) + goto BOUND_for_half_lease;
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//If we do that, "packet_num < 3" test below might be superfluous
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//(lease_remaining will run out anyway)
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/* Timed out or error, enter rebinding state */
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log1s("entering rebinding state");
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/* Enter rebinding state */
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client_data.state = REBINDING;
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log1s("entering rebinding state");
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/* Switch to bcast receive */
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change_listen_mode(LISTEN_RAW);
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packet_num = 0;
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@ -1575,31 +1575,34 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
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/* Is it a signal? */
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switch (udhcp_sp_read()) {
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case SIGUSR1:
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if (client_data.state <= REQUESTING)
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/* Initial negotiations in progress, do not disturb */
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break;
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if (lease_remaining > 30) /* if renew fails, do not go back to BOUND */
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lease_remaining = 30;
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client_data.first_secs = 0; /* make secs field count from 0 */
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bb_simple_info_msg("performing DHCP renew");
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packet_num = 0;
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switch (client_data.state) {
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/* Try to renew/rebind */
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case BOUND:
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case RENEWING:
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case REBINDING:
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change_listen_mode(LISTEN_KERNEL);
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client_data.state = RENEW_REQUESTED;
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goto case_RENEW_REQUESTED;
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goto got_SIGUSR1;
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/* Start things over */
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case RENEW_REQUESTED: /* two or more SIGUSR1 received */
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/* Two SIGUSR1 received, start things over */
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case RENEW_REQUESTED:
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change_listen_mode(LISTEN_NONE);
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udhcp_run_script(NULL, "deconfig");
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/* Wake from SIGUSR2-induced deconfigured state */
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default:
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/* case REQUESTING: */
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/* case RELEASED: */
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/* case INIT_SELECTING: */
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change_listen_mode(LISTEN_NONE);
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}
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client_data.state = INIT_SELECTING;
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packet_num = 0;
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/* Kill any timeouts, user wants this to hurry along */
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timeout = 0;
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continue;
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@ -1723,10 +1726,9 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
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strcpy(server_str, inet_ntoa(temp_addr));
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temp_addr.s_addr = packet.yiaddr;
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lease_remaining = 60 * 60;
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temp = udhcp_get_option32(&packet, DHCP_LEASE_TIME);
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if (!temp) {
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lease_remaining = 60 * 60;
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} else {
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if (temp) {
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uint32_t lease;
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/* it IS unaligned sometimes, don't "optimize" */
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move_from_unaligned32(lease, temp);
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@ -1798,8 +1800,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
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opt = ((opt & ~OPT_b) | OPT_f);
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}
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#endif
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// BOUND_for_half_lease:
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BOUND_for_half_lease:
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timeout = (unsigned)lease_remaining / 2;
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client_data.state = BOUND;
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/* make future renew packets use different xid */
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