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| author | user <user@clank> | 2026-07-17 14:11:22 +0200 |
|---|---|---|
| committer | user <user@clank> | 2026-07-17 14:11:22 +0200 |
| commit | a2cb756693229c7880d926d2cdde2f838c697415 (patch) | |
| tree | e327278e7d8b7150d7a2b01cf38b4895caab7356 /include | |
| parent | kernel: sys_sleep - a cooperative delay off the DIV timer (+ ping pacing) (diff) | |
| download | gbos-a2cb756693229c7880d926d2cdde2f838c697415.tar.gz gbos-a2cb756693229c7880d926d2cdde2f838c697415.tar.xz gbos-a2cb756693229c7880d926d2cdde2f838c697415.zip | |
net: DHCP client - lease the IP at boot instead of hardcoding it
The address is no longer baked in. net_init starts at 0.0.0.0; a DHCP client
runs as the first thing on boot (init/shell forks it and waits), and only once
it has a lease (or gives up) does the prompt appear.
Kernel:
- IP is configurable: 0.0.0.0 until leased; NET_SETIP op stores it.
- 16-bit frame length. DHCP/BOOTP packets are ~272 bytes, over the old 255-byte
frame cap, so net_slip_send takes a 16-bit length, net_pump assembles into a
320-byte buffer with a 16-bit wNetRxLen, and udp_send writes a 16-bit IP total.
Payloads stay <=255 (kept small on purpose) so the per-protocol datalen math
is unchanged. wNetTx/wNetRxBuf 256->320, SK_RXBUF 208->288.
Userland:
- c/dhcp.c: DISCOVER->OFFER->REQUEST->ACK over a UDP socket, then net_setip();
times out gracefully (shell still boots) if there's no server. sh.c runs it
before the prompt.
Bridge (self-contained DHCP server, no dnsmasq):
- tunbridge.py + netboot intercept UDP->:67 and answer OFFER/ACK leasing
10.0.0.2 (gateway 10.0.0.1); everything else is bridged/NATed as before.
Regression-tested ICMP/UDP/TCP after the 16-bit change. Verified end to end:
dhcp: discovering
dhcp: leased 10.0.0.2
/# ping 10.0.0.1 -> 4/4 (traffic from the leased address)
Diffstat (limited to '')
| -rw-r--r-- | include/gbos.inc | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/gbos.inc b/include/gbos.inc index 049a4bc..937d083 100644 --- a/include/gbos.inc +++ b/include/gbos.inc @@ -152,6 +152,7 @@ DEF NET_RECV EQU 3 ; NR_SOCK, NR_BUF, NR_LEN(max) -> A=len or $FF(timeout); DEF NET_CLOSE EQU 4 ; NR_SOCK DEF NET_BIND EQU 5 ; NR_SOCK, NR_PORT -> bind local port (UDP) DEF NET_POLL EQU 6 ; pump RX once (answer pings) -> A=0 +DEF NET_SETIP EQU 7 ; set our IPv4 address from NR_IP (DHCP) ; socket types DEF SOCK_ICMP EQU 1 DEF SOCK_UDP EQU 2 @@ -252,5 +253,6 @@ DEF PROG_CHAT EQU 25 DEF PROG_NETD EQU 26 DEF PROG_PING EQU 27 DEF PROG_NSLOOKUP EQU 28 +DEF PROG_DHCP EQU 29 ENDC |