acassis opened a new pull request, #18843:
URL: https://github.com/apache/nuttx/pull/18843
## Summary
This commit make ICMPv6 on NuttX compliant with RFC4861 ignoring a DN packet
when its optlen is 0.
## Impact
Make NuttX compliant with RFC 4861.
## Testing
Using sim:nettest
```
$ sudo ./nuttx
...
nsh> ifup eth0
ifup eth0...OK
nsh> ifconfig
eth0 Link encap:Ethernet HWaddr 42:29:9f:00:77:89 at RUNNING mtu 1500
inet addr:10.0.1.2 DRaddr:10.0.1.1 Mask:255.255.255.0
inet6 addr: fc00::2/112
inet6 DRaddr: fc00::1
RX: Received Fragment Errors Bytes
0000001e 00000000 00000000 109d
IPv4 IPv6 ARP Dropped
00000000 0000001e 00000000 00000000
TX: Queued Sent Errors Timeouts Bytes
00000000 00000000 00000000 00000000 0
Total Errors: 00000000
lo Link encap:Local Loopback at RUNNING mtu 1518
inet addr:127.0.0.1 DRaddr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128
inet6 DRaddr: ::1
RX: Received Fragment Errors Bytes
00000000 00000000 00000000 0
IPv4 IPv6 ARP Dropped
00000000 00000000 00000000 00000000
TX: Queued Sent Errors Timeouts Bytes
00000000 00000000 00000000 00000000 0
Total Errors: 00000000
IPv4 IPv6 TCP UDP ICMP ICMPv6
Received 0000 001e 0000 000f 0000 000f
Dropped 0000 0000 0000 0000 0000 000f
IPv4 VHL: 0000 Frg: 0000
IPv6 VHL: 0000
Checksum 0000 ---- 0000 0000 ---- ----
TCP ACK: 0000 SYN: 0000
RST: 0000 0000
Type 0000 0000 ---- ---- 0000 000e
Sent 0000 0000 0000 0000 0000 0000
Rexmit ---- ---- 0000 ---- ---- ----
nsh>
```
In another Linux terminal:
```
$ sudo ip -6 addr add fc00::1/112 dev tap0
$ sudo ip link set tap0 up
$ ping6 -I tap0 -c3 fc00::2
``
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