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subhobhai943andClaude Opus 4.8
cd840d5799
Turn the networking stubs into a working transport/application stack on top of
the existing L2/L3 (Ethernet/ARP/IPv4/ICMP) core.
UDP (net/ipv4/udp.c)
- Port-demux table with bound receive handlers, pseudo-header checksum,
ephemeral-port allocation, limited-broadcast send (0.0.0.0 -> 255.255.255.255
for DHCP before the interface has an address), and rx/tx/drop counters.
- Wired into the IPv4 receive path (IP_PROTO_UDP dispatch in net/core/net.c).
BSD sockets (net/core/socket.c)
- Real SOCK_DGRAM sockets backed by UDP: bind installs a UDP handler that fills
a per-socket receive ring; send/sendto and recv/recvfrom move datagrams;
ephemeral auto-bind, connect() memorises the peer. Socket table + I/O stats
exposed for introspection.
DNS resolver (net/ipv4/dns.c)
- Builds and parses real A-record queries over UDP/53 (label encoding,
compression-pointer aware answer walk), cache-first with TTL, static-hosts
and dotted-quad fast paths, and a bounded timeout that degrades to fallback
instead of hanging.
DHCP client (net/ipv4/dhcp.c)
- Full DISCOVER/OFFER/REQUEST/ACK handshake over UDP broadcast, option parsing
(mask/router/dns/lease/server-id), applies the lease to the primary
interface, bounded timeouts keep the static config on no response.
Fix (net/ipv4/dns_cache.c): the cache stored IPs as 0xAABBCCDD numeric while the
rest of the stack uses network-byte-order-in-memory (ip_parse/ip_to_str), so a
resolved address came back byte-swapped (nslookup github.com -> 100.121.82.140).
Seeds and dump now use ip_parse/ip_to_str; verified 140.82.121.4.
Userland (lazybox): live ifconfig (real interface + NIC counters, loopback),
netstat with live UDP bindings and transport stats, new `sockstat`, richer
nslookup. Verified in QEMU: boot clean on x86_64/aarch64/armv8i, login as SUB,
ping/nslookup/dhclient/netstat/sockstat all run; DHCP/DNS wire replies are
blocked by the sandbox's slirp but time out cleanly and fall back as designed.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Fh5z6V7nGPbHvqVG5p4CXX
28 lines
696 B
C
28 lines
696 B
C
#ifndef _NET_DHCP_H
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#define _NET_DHCP_H
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#include <stdint.h>
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#include <stdbool.h>
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void dhcp_init(void);
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// Run a full DHCP handshake (DISCOVER/OFFER/REQUEST/ACK) and, on success, apply
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// the offered IP, mask, gateway and DNS to the primary interface. Returns 0 on
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// a granted lease, -1 on timeout (the static configuration is left in place).
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int dhcp_request_lease(void);
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// Last-lease details for status reporting (valid after a successful lease).
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typedef struct {
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uint32_t ip;
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uint32_t mask;
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uint32_t gateway;
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uint32_t dns;
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uint32_t server;
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uint32_t lease_secs;
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bool bound;
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} dhcp_lease_t;
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const dhcp_lease_t* dhcp_get_lease(void);
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#endif // _NET_DHCP_H
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