Laczen opened a new pull request, #15980: URL: https://github.com/apache/nuttx/pull/15980
## Summary When a udp frame is processed without a listener a icmp frame is returned indicating that there is no listener. The PR enables sending this icmpv6 response over sixlowpan. Solves #15972. ## Impact * Is new feature added? YES * Impact on user (will user need to adapt to change)? NO * Impact on build (will build process change)? NO - Changes are localized to the networking stack. * Impact on hardware (will arch(s) / board(s) / driver(s) change)? NO - This is a software fix affecting network protocol handling. * Impact on documentation (is update required / provided)? NO - The fix addresses an undocumented edge case. * Impact on security (any sort of implications)? NO - While the bug could disrupt communication, it did not introduce a direct security vulnerability. The fix further enhances robustness. * Impact on compatibility (backward/forward/interoperability)? NO - The fix corrects erroneous behavior and should not impact compatibility. Applications relying on the previous, incorrect behavior might need minor adjustments (though this is unlikely). * Anything else to consider? None. ## Testing The correct operation was verified on two sixlowpan nodes over espnow. A udpclient would send packages to a node with not operational udpserver. The client shows (the last line shows that the destination is unreachable): ``` udp_callback: flags: 0010 send_eventhandler: flags: 0010 sixlowpan_queue_frames: buflen=96 sixlowpan_queue_frames: Sending packet length 96 sixlowpan_compresshdr_hc06: fptr=0x3ffb38b0 g_frame_hdrlen=8 iphc=0x3ffb38b8 compress_laddr: Compressing bitpos=4 compress_laddr: srcipaddr=fe80:0000:0000:0000:0000:00ff:fe00:000b compress_laddr: addr=0b compress_laddr: Tag=30 compress_tagaddr: Compressing bitpos=0 addrlen=1 compress_tagaddr: ipaddr=fe80:0000:0000:0000:0000:00ff:fe00:000a compress_tagaddr: addr=0a compress_tagaddr: Tag=03 sixlowpan_compresshdr_hc06: Uncompressed UDP ports: srcport=1560 destport=155f sixlowpan_compresshdr_hc06: WARNING: Cannot compress headers sixlowpan_compresshdr_hc06: fptr=0x3ffb38b0 g_frame_hdrlen=17 iphc=7e:33:f0 g_hc06ptr=0x3ffb38c1 sixlowpan_queue_frames: Header of length=17 protosize=0 sixlowpan_queue_frames: Non-fragmented: length 113 sixlowpan_queue_frames: Submitting frame length=113 io_offset=8 espnow_req_data: Queuing frame IOB 0x3ffb38a4 espnow_req_data: MAC: 0a espnow_req_data: MAC: 0b client: 51. Sent 96 bytes espnow_work: Send frame 0x3ffb38a4 to the network: Offset=0 Length=163 sixlowpan_frame_process: IPHC Dispatch sixlowpan_uncompresshdr_hc06: fptr=0x3ffb38b0 g_frame_hdrlen=8 iphc=7b:33:3a g_hc06ptr=0x3ffb38ba sixlowpan_uncompresshdr_hc06: Next header inline: 58 uncompress_addr: Uncompressing 2 + 1 ipaddr=fe80:0000:0000:0000:0000:00ff:fe00:000a uncompress_addr: Uncompressing 2 + 1 ipaddr=fe80:0000:0000:0000:0000:00ff:fe00:000b sixlowpan_frame_process: rb_accumlen=0 rb_pktlen=192 paysize=152 sixlowpan_frame_process: IP packet ready (length 192) sixlowpan_dispatch: IPv6 packet dispatch icmpv6_input: WARNING: Unknown ICMPv6 type: 1 ``` The server shows (line 12 shows there is no listener and generates a response): ``` espnow_work: Send frame 0x3ffb3974 to the network: Offset=0 Length=113 sixlowpan_frame_process: IPHC Dispatch sixlowpan_uncompresshdr_hc06: fptr=0x3ffb3980 g_frame_hdrlen=8 iphc=7e:33:f0 g_hc06ptr=0x3ffb398a uncompress_addr: Uncompressing 2 + 1 ipaddr=fe80:0000:0000:0000:0000:00ff:fe00:000b uncompress_addr: Uncompressing 2 + 1 ipaddr=fe80:0000:0000:0000:0000:00ff:fe00:000a sixlowpan_uncompresshdr_hc06: Incoming header value: 240 sixlowpan_uncompresshdr_hc06: Uncompressed UDP ports (ptr+5): 1560, 155f sixlowpan_uncompresshdr_hc06: Checksum included sixlowpan_frame_process: rb_accumlen=0 rb_pktlen=144 paysize=96 sixlowpan_frame_process: IP packet ready (length 144) sixlowpan_dispatch: IPv6 packet dispatch udp_input: WARNING: No listener on UDP port ipv6_build_header: IPv6 Payload length: 152 icmpv6_reply: Outgoing ICMPv6 packet length: 192 sixlowpan_icmpv6_send: d_len 192 sixlowpan_queue_frames: buflen=148 sixlowpan_queue_frames: Sending packet length 148 sixlowpan_compresshdr_hc06: fptr=0x3ffb37e0 g_frame_hdrlen=8 iphc=0x3ffb37e8 compress_laddr: Compressing bitpos=4 compress_laddr: srcipaddr=fe80:0000:0000:0000:0000:00ff:fe00:000a compress_laddr: addr=0a compress_laddr: Tag=30 compress_tagaddr: Compressing bitpos=0 addrlen=1 compress_tagaddr: ipaddr=fe80:0000:0000:0000:0000:00ff:fe00:000b compress_tagaddr: addr=0b compress_tagaddr: Tag=03 sixlowpan_compresshdr_hc06: fptr=0x3ffb37e0 g_frame_hdrlen=11 iphc=7b:33:3a g_hc06ptr=0x3ffb37eb sixlowpan_queue_frames: Header of length=11 protosize=4 sixlowpan_queue_frames: Non-fragmented: length 163 sixlowpan_queue_frames: Submitting frame length=163 io_offset=8 espnow_req_data: Queuing frame IOB 0x3ffb37d4 espnow_req_data: MAC: 0b espnow_req_data: MAC: 0a ``` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@nuttx.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
