OrgApache/incubator-nuttx
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incubator-nuttx
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7 Commits

Author SHA1 Message Date
Zhe Weng a9da1fff28 net/nat: Add auto reclaim logic for NAT entries. 
Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
 2022-12-22 20:20:12 +08:00
Zhe Weng 879c337e30 net/nat: Use hashtable to optimize performance 
Performance tested on simulator:

Before optimization:      -25% bandwidth @2k entries, -64% @10k entries
hashtable size=  2(1bit): -24% bandwidth @2k entries, -65% @10k entries
hashtable size=  4(2bits):-15% bandwidth @2k entries, -51% @10k entries
hashtable size= 32(5bits): -3% bandwidth @2k entries, -14% @10k entries
hashtable size=256(8bits): -1% bandwidth @2k entries,  -3% @10k entries

Note: Tested on worst performance, the earliest entry will be the worst.

Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
 2022-12-22 20:20:12 +08:00
Zhe Weng 9aefd6717c net/nat: Add support for ICMP Error Message 
Support DEST_UNREACHABLE, TIME_EXCEEDED and PARAMETER_PROBLEM ICMP types in NAT.

Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
 2022-12-01 22:45:22 +08:00
Zhe Weng a3a669a5f6 net/nat: Add UDP support 
Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
 2022-11-11 14:36:55 +08:00
Zhe Weng 8d401db5b9 net/nat: Add ICMP ECHO (REQUEST & REPLY) support 
Support ICMP ECHO REQUEST & REPLY. Id of ICMP is processed like port of TCP in NAT. However, our ICMP stack doesn't have a method to manage id allocation like tcp_selectport(), the id is set by apps (like icmp_ping.c) without conflict avoidance, so not adding such conflict avoidance logic to ICMP stack when implementing NAT.

Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
 2022-11-11 14:36:55 +08:00
Zhe Weng 8239ddeef4 net/nat: Add TCP entry expiration logic 
Add TCP entry expiration logic for NAT, with entries changed from sq to dq for fast removal.

Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
 2022-11-11 14:36:55 +08:00
Zhe Weng b595430578 net: add basic NAT workflow 
Add basic functions for NAT (NAPT), remaining some logic unimplemented (UDP, ICMP, port assignment, etc). NAT for TCP can work now (unless port conflicts).
Outbound: LAN ->  Forward  ->  NAT(only if targeting at WAN)  -> WAN
Inbound:  WAN ->  NAT(only from WAN, change dest) -> Forward  -> LAN

Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
 2022-11-11 14:36:55 +08:00