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net: ip: dhcpv4: remove address on interface down

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Any received address is no longer valid once the interface goes down.
Leaving the address assigned results in the L4 interface transitioning
through the following on reconnection:
 UP: Interface is connected
 DOWN: Old address is removed by DHCP
 UP: New address is re-added by DHCP

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
This commit is contained in:
Jordan Yates 2023-12-19 18:18:50 +10:00 committed by Carles Cufí
parent 434c93ddfb
commit 1ef0ec55c9
1 changed files with 4 additions and 0 deletions
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4
subsys/net/ip/dhcpv4.c
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@ -1163,6 +1163,10 @@ static void dhcpv4_iface_event_handler(struct net_mgmt_event_callback *cb,
iface->config.dhcpv4.state = NET_DHCPV4_RENEWING;
NET_DBG("enter state=%s", net_dhcpv4_state_name(
iface->config.dhcpv4.state));
/* Remove any bound address as interface is gone */
if (!net_if_ipv4_addr_rm(iface, &iface->config.dhcpv4.requested_ip)) {
NET_DBG("Failed to remove addr from iface");
}
}
} else if (mgmt_event == NET_EVENT_IF_UP) {
NET_DBG("Interface %p coming up", iface);