Espressif patches in 2.1.3 esp on top of 2.1.3 rel

List of commits on 2.1.3-esp

• on top of 2.1.3-rel (6ca936f6b588cee702c638eee75c2436e6cf75de) STABLE 2_1_3_RELEASE

commit id	summary/ MR	Status
ec115c72	ci: Publish branch 2.1.3-esp if CI passes	IDF-4797: P10207
e9704b8a	test/napt: Add unit test for IP forward with PBUF_REF	IDF-4797: P10207
4a05f397	napt: Fix PBUF_REF type to clone the pbuf before forwarding	IDF-4800
8a5a30dd	PPP: Add test exhibiting empty packet null-deref	IDF-4797: P10207
b5934a2c	PPP: Fix null-deref when processing wrong packet	IDF-4847: P10198, P10013, P10179, B58817
95048339	dns: Add API to clear dns cache	IDF-4839
5446609a	timeout: Add function for deinit system timers	IDF-4847: P10198, P10013, P10179, B58817
e8c46a56	sntp: Fix client receive KOD packet that make pool MEMP_SYS_TIMEOUT not be freed	IDF-4847: P10198, P10013, P10179, B58817
9247429e	dns: Fix server_idx increasing to DNS_MAX_SERVERS and trigger the LWIP_ASSERT	IDF-4839
223101f1	tcp_in: Flag the pcb as closing if TCP_EVENT_CLOSED refused	IDF-4847: P10198, P10013, P10179, B58817
1343f47b	dhcp: Add dhcp state debug info	IDF-4817: P10207, P10194
84e02732	slip: Fix SLIP RX linked list append.	IDF-4847: P10198, P10013, P10179, B58817
9d6459ec	tcp_in: Fix for potential segment overflow	IDF-4852
a46014d2	nd6: Queue IPv6 packets while ND6 inprogress	IDF-4849
00585644	arp: Return ERR_MEM on ARP queue full	IDF-4849
70d46d23	ip_frag: Drop IPv6 packets larger than MTU	IDF-4846: P10199
c35e4d32	ppp: Fix potential array overflow	IDF-4847: P10198, P10013, P10179, B58817
66666948	sockets: Fix free-select-locked after udp close	IDF-4794
83edc198	ip_frag: Drop IPv4 packets larger than MTU	IDF-4846: P10199
8cf7089c	api_msg: Fixes for sock close from another thread	IDF-4794
882716f7	sockets: Fix potential race when socket is closed already	IDF-4794
d058bbbe	sockets: Fix select-waiter when socket closed abruptly	IDF-4794
c0fa16fb	ipv6: Support IPv4/IPv6 mapped PCBs	IDF-4845
9752eb5f	autoip: Make max-conflics and rate-limit configurable	IDF-4843
771421c8	dns: Support for fallback DNS server	IDF-4839
7d3b07fd	igmp/mld6: Add on-demand timers config	IDF-4837
f978e87f	dhcp: Add hook for appending extra client's request options	IDF-4817: P10207, P10194
632ac61f	dhcp/test: Add dhcp option tests for platform hooks	IDF-4817: P10207, P10194
0633e7d1	dhcp: Continuously try to rebind in t2 (if failed in t1)	IDF-4817: P10207, P10194
729d724c	dhcp: Set hostname for DISCOVER packets	IDF-4817: P10207, P10194
73a92e31	dhcp: Enable custom config for timeouts, thresholds, delays	IDF-4817: P10207, P10194
14bba8e3	dhcp: Add post_init hook to allow skip discovery	IDF-4817: P10207, P10194
319d4d3c	napt: Add basic support for NAT by martin-ger	IDF-4800
bc507222	ipv6: Add error check on joining incorrect multicast address	IDF-4799: P10199
72105e53	tcp: Make retransmission timeout (RTO) configurable	IDF-4798: P10197
0a9dad95	api_msg: Support sock close from another thread	IDF-4794
5f246f5f	ci: Add unit test suite to validate tcp state transitions	IDF-4797: P10207
4a2fb780	ci: Add github/lab build/run unit tests on linux	IDF-4797: P10207
08f1b41d	ci: Update esp-lwip's version to 2.1.3-esp	IDF-4797: P10207
dd27077a	Fix compile error with GCC 8 in makefsdata	IDF-4797: P10207