From cb075bfc16034bd12d7b9c6394586080d7d0d5f2 Mon Sep 17 00:00:00 2001
From: Dario Nieuwenhuis <dirbaio@dirbaio.net>
Date: Wed, 7 Apr 2021 01:32:04 +0200
Subject: [PATCH] dhcp: handle NAK packets

---
 src/socket/dhcpv4.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/socket/dhcpv4.rs b/src/socket/dhcpv4.rs
index 8137ff6..fa26e96 100644
--- a/src/socket/dhcpv4.rs
+++ b/src/socket/dhcpv4.rs
@@ -206,6 +206,9 @@ impl Dhcpv4Socket {
                     });
                 }
             }
+            (ClientState::Requesting(_), DhcpMessageType::Nak) => {
+                self.reset();
+            }
             (ClientState::Renewing(state), DhcpMessageType::Ack) => {
                 if let Some((config, renew_at, expires_at)) = Self::parse_ack(now, ip_repr, &dhcp_repr) {
                     state.renew_at = renew_at;
@@ -216,6 +219,9 @@ impl Dhcpv4Socket {
                     }
                 }
             }
+            (ClientState::Renewing(_), DhcpMessageType::Nak) => {
+                self.reset();
+            }
             _ => {
                 net_debug!("DHCP ignoring {:?}: unexpected in current state", dhcp_repr.message_type);
             }