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Merge pull request #417 from DrDoof/fix/dhcp-missing-t1

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dhcp: renew at half the lease when the server omits T1
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René van Dorst authored and GitHub committed 2026-09-08 19:50:39 +00:00
2 parents 6488433584 eab17f8a3f
commit 1ed12d1101
1 file changed
+12
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dhcp.c
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@@ -332,6 +332,18 @@ void parse_dhcp(void)
uip_ipaddr(&uip_hostaddr, dhcp_state.current_ip[0], dhcp_state.current_ip[1], dhcp_state.current_ip[2], dhcp_state.current_ip[3]); uip_ipaddr(&uip_hostaddr, dhcp_state.current_ip[0], dhcp_state.current_ip[1], dhcp_state.current_ip[2], dhcp_state.current_ip[3]);
uip_ipaddr(&uip_draddr, dhcp_state.router[0], dhcp_state.router[1], dhcp_state.router[2], dhcp_state.router[3]); uip_ipaddr(&uip_draddr, dhcp_state.router[0], dhcp_state.router[1], dhcp_state.router[2], dhcp_state.router[3]);
uip_ipaddr(&uip_netmask, dhcp_state.subnet[0], dhcp_state.subnet[1], dhcp_state.subnet[2], dhcp_state.subnet[3]); uip_ipaddr(&uip_netmask, dhcp_state.subnet[0], dhcp_state.subnet[1], dhcp_state.subnet[2], dhcp_state.subnet[3]);
/* T1 is optional. Without it the renewal time stays zero, which
* makes dhcp_timer zero, and the callback then sends a REQUEST on
* every pass through LEASING: client and server trade REQUEST and
* ACK as fast as the round trip allows. RFC 2131 has the client
* renew at half the lease when the server does not say, and if
* there is no lease either, pick something rather than zero. Only
* filled in when absent, so a server that asks for a short renewal
* still gets it. */
if (!dhcp_state.renewal)
dhcp_state.renewal = dhcp_state.lease / 2;
if (!dhcp_state.renewal)
dhcp_state.renewal = 60;
dhcp_state.state = DHCP_LEASING; dhcp_state.state = DHCP_LEASING;
dhcp_state.ticks = SYS_TICK_HZ; dhcp_state.ticks = SYS_TICK_HZ;
dhcp_state.dhcp_timer = dhcp_state.renewal > 0xffff ? 0xffff : dhcp_state.renewal; dhcp_state.dhcp_timer = dhcp_state.renewal > 0xffff ? 0xffff : dhcp_state.renewal;