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| author | user <user@clank> | 2026-07-17 02:03:05 +0200 |
|---|---|---|
| committer | user <user@clank> | 2026-07-17 02:03:05 +0200 |
| commit | c8c22bfc511ac65036cd8f8462e0a01757eb4372 (patch) | |
| tree | 844763be861048cb76ac77bc1b13bafa3a8feba5 /src/net.asm | |
| parent | net: chat client - async receive + OSK send over the link port (diff) | |
| download | gbos-c8c22bfc511ac65036cd8f8462e0a01757eb4372.tar.gz gbos-c8c22bfc511ac65036cd8f8462e0a01757eb4372.tar.xz gbos-c8c22bfc511ac65036cd8f8462e0a01757eb4372.zip | |
net: real IP stack, milestone A - ICMP echo (you can ping a Game Boy)
Start of an actual TCP/IP stack on gbos (TLS stays in a proxy). netd is a
userland IP responder over SLIP: our address is 10.0.0.2, the SLIP peer
10.0.0.1. It parses IPv4 headers, answers ICMP echo requests, and rebuilds
the packet with correct IP + ICMP checksums (RFC 1071 one's-complement sum,
carry-folded - works fine on the SM83).
c/netd.c + register; tools/gateway.py gains --mode ping: it crafts ICMP echo
requests over SLIP and verifies the replies.
Verified: `netd` answers 4 pings, gateway reports reply from 10.0.0.2 with
cksum=ok for each. Next: UDP, then TCP.
Diffstat (limited to 'src/net.asm')
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