Merge branch 'Bufix/backport_some_lwip_bugs_for_4.3_1214' into 'release/v4.3'

Lwip:Backport some lwip bugs to 4.3

See merge request espressif/esp-idf!21594

components/lwip/Kconfig

@@ -429,7 +429,13 @@ menu "LWIP"
             int "Maximum segment lifetime (MSL)"
             default 60000
             help
-                Set maximum segment lifetime in in milliseconds.
+                Set maximum segment lifetime in milliseconds.
+
+        config LWIP_TCP_FIN_WAIT_TIMEOUT
+            int "Maximum FIN segment lifetime"
+            default 20000
+            help
+                Set maximum segment lifetime in milliseconds.
 
         config LWIP_TCP_SND_BUF_DEFAULT
             int "Default send buffer size"

components/lwip/lwip

@@ -1 +1 @@
-Subproject commit 76303df2386902e0d7873be4217f1d9d1b50f982
+Subproject commit 6fa02bd30daa656f896c7a36248253fb3b97660d

components/lwip/port/esp32/include/lwipopts.h

@@ -254,6 +254,14 @@
  */
 #define ESP_DHCP_DISABLE_CLIENT_ID      CONFIG_LWIP_DHCP_DISABLE_CLIENT_ID
 
+#define DHCP_DEFINE_CUSTOM_TIMEOUTS     1
+/* Since for embedded devices it's not that hard to miss a discover packet, so lower
+ * the discover retry backoff time from (2,4,8,16,32,60,60)s to (500m,1,2,4,8,15,15)s.
+ */
+ #define DHCP_REQUEST_TIMEOUT_SEQUENCE(state, tries)   (state == DHCP_STATE_REQUESTING ? \
+                                                       (uint16_t)(1 * 1000) : \
+                                                       (uint16_t)(((tries) < 6 ? 1 << (tries) : 60) * 250))
+
 /**
  * CONFIG_LWIP_DHCP_RESTORE_LAST_IP==1: Last valid IP address obtained from DHCP server
  * is restored after reset/power-up.
@@ -376,6 +384,11 @@
  */
 #define TCP_MSL                         CONFIG_LWIP_TCP_MSL
 
+/**
+ * TCP_FIN_WAIT_TIMEOUT: The maximum FIN segment lifetime in milliseconds
+ */
+#define TCP_FIN_WAIT_TIMEOUT            CONFIG_LWIP_TCP_FIN_WAIT_TIMEOUT
+
 /**
  * TCP_MAXRTX: Maximum number of retransmissions of data segments.
  */
@@ -996,9 +1009,23 @@
 #ifdef CONFIG_LWIP_TIMERS_ONDEMAND
 #define ESP_LWIP_IGMP_TIMERS_ONDEMAND            1
 #define ESP_LWIP_MLD6_TIMERS_ONDEMAND            1
+#define ESP_LWIP_DHCP_FINE_TIMERS_ONDEMAND       1
+#define ESP_LWIP_DNS_TIMERS_ONDEMAND             1
+#if IP_REASSEMBLY
+#define ESP_LWIP_IP4_REASSEMBLY_TIMERS_ONDEMAND  1
+#endif /* IP_REASSEMBLY */
+#if LWIP_IPV6_REASS
+#define ESP_LWIP_IP6_REASSEMBLY_TIMERS_ONDEMAND  1
+#endif /* LWIP_IPV6_REASS */
 #else
-#define ESP_LWIP_IGMP_TIMERS_ONDEMAND            0
-#define ESP_LWIP_MLD6_TIMERS_ONDEMAND            0
+#define ESP_LWIP_DHCP_FINE_TIMERS_ONDEMAND       0
+#define ESP_LWIP_DNS_TIMERS_ONDEMAND             0
+#if IP_REASSEMBLY
+#define ESP_LWIP_IP4_REASSEMBLY_TIMERS_ONDEMAND  0
+#endif /* IP_REASSEMBLY */
+#if LWIP_IPV6_REASS
+#define ESP_LWIP_IP6_REASSEMBLY_TIMERS_ONDEMAND  0
+#endif /* LWIP_IPV6_REASS */
 #endif
 
 #define TCP_SND_BUF                     CONFIG_LWIP_TCP_SND_BUF_DEFAULT

components/lwip/test_afl_host/sdkconfig.defaults

@@ -1 +1,2 @@
 CONFIG_LWIP_DNS_SUPPORT_MDNS_QUERIES=n
+CONFIG_LWIP_TIMERS_ONDEMAND=n

docs/en/api-guides/lwip.rst

@@ -383,6 +383,7 @@ Most lwIP RAM usage is on-demand, as RAM is allocated from the heap as needed. T
 
 - Reducing :ref:`CONFIG_LWIP_MAX_SOCKETS` reduces the maximum number of sockets in the system. This will also cause TCP sockets in the ``WAIT_CLOSE`` state to be closed and recycled more rapidly (if needed to open a new socket), further reducing peak RAM usage.
 - Reducing :ref:`CONFIG_LWIP_TCPIP_RECVMBOX_SIZE`, :ref:`CONFIG_LWIP_TCP_RECVMBOX_SIZE` and :ref:`CONFIG_LWIP_UDP_RECVMBOX_SIZE` reduce memory usage at the expense of throughput, depending on usage.
+- Reducing :ref:`CONFIG_LWIP_TCP_MSL`, :ref:`CONFIG_LWIP_TCP_FIN_WAIT_TIMEOUT` reduces the maximum segment lifetime in the system. This will also cause TCP sockets in the ``TIME_WAIT``, ``FIN_WAIT_2`` state to be closed and recycled more rapidly 
 - Disable  :ref:`CONFIG_LWIP_IPV6` can save about 39 KB for firmware size and 2KB RAM when system power up and 7KB RAM when TCPIP stack running. If there is no requirement for supporting IPV6 then it can be disabled to save flash and RAM footprint.
 
 If using Wi-Fi, please also refer to :ref:`wifi-buffer-usage`.