lwip_netif.c File Reference

lwIP netif initialization and poll driver for miniOS. More...

#include <miniOS/net/lwip_netif.h>
#include <miniOS/net/lwip_port.h>
#include <miniOS/net/net_config.h>
#include <string.h>
#include "lwip/init.h"
#include "lwip/dns.h"
#include "lwip/netif.h"
#include "lwip/ip4_addr.h"
#include "lwip/timeouts.h"
#include "lwip/pbuf.h"
#include "lwip/etharp.h"
#include "netif/ethernet.h"

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Functions
static err_t	miniOS_netif_linkoutput (struct netif *netif, struct pbuf *p)
	linkoutput callback: transmit a pbuf chain via lwip_port_tx().
static err_t	miniOS_netif_init (struct netif *netif)
	netif initialization callback called by netif_add().
static void	miniOS_lwip_rx_callback (netdev_t *dev, lwip_port_frame_kind_t kind, const void *frame, size_t frame_len, const ethernet_frame_info_t *info, void *ctx)
	RX callback wired into lwip_port_attach().
static void	miniOS_lwip_timeout_cb (uint32_t elapsed_ms, void *ctx)
	Timeout callback wired into lwip_port_attach().
void	lwip_netif_init (void)
	Initialize lwIP stack and register eth0 netif.
void	lwip_netif_poll (void)
	Poll the network interface and drive lwIP timers.

Variables
static struct netif	g_lwip_netif

Detailed Description

lwIP netif initialization and poll driver for miniOS.

Bridges the lwip_port Ethernet seam to lwIP's netif layer. Operates in NO_SYS=1 mode — no threading, no tcpip_thread.

Function Documentation

lwip_netif_init()

void lwip_netif_init

(

void

)

Initialize lwIP stack and register eth0 netif.

Calls lwip_init(), netif_add() with QEMU static IPv4 config from net_config_get_active(), wires the RX callback to ethernet_input(), and calls lwip_port_attach() to connect the Ethernet seam. Must be called after net_observe_init() and before any socket operations.

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lwip_netif_poll()

void lwip_netif_poll

(

void

)

Poll the network interface and drive lwIP timers.

Calls lwip_port_poll() then sys_check_timeouts(). Must be called regularly (every ~10ms) to keep TCP retransmit and ARP aging alive. Also calls lwip_port_poll_timeouts(10) to feed the timeout accumulator.

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miniOS_lwip_rx_callback()

void miniOS_lwip_rx_callback ( netdev_t * dev, lwip_port_frame_kind_t kind, const void * frame, size_t frame_len, const ethernet_frame_info_t * info, void * ctx )

static

RX callback wired into lwip_port_attach().

Receives classified Ethernet frames from lwip_port and feeds them into lwIP's ethernet_input() for ARP and IPv4 processing. Unsupported frames (LWIP_PORT_FRAME_UNSUPPORTED) are silently dropped.

T-42-02-01: drops frame when pbuf_alloc returns NULL (pool exhausted). T-42-02-04: NULL ctx guard is defensive; ctx is always &g_lwip_netif.

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miniOS_lwip_timeout_cb()

void miniOS_lwip_timeout_cb ( uint32_t elapsed_ms, void * ctx )

static

Timeout callback wired into lwip_port_attach().

Called by lwip_port_poll_timeouts() when the elapsed threshold is reached. Drives lwIP's internal timers (TCP retransmit, ARP aging, etc.).

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miniOS_netif_init()

err_t miniOS_netif_init ( struct netif * netif )

static

netif initialization callback called by netif_add().

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miniOS_netif_linkoutput()

err_t miniOS_netif_linkoutput ( struct netif * netif, struct pbuf * p )

static

linkoutput callback: transmit a pbuf chain via lwip_port_tx().

Flattens the pbuf chain into a contiguous frame buffer before TX. Frames exceeding 1514 bytes (max Ethernet payload) are rejected with ERR_MEM to satisfy threat T-42-02-02 (oversized frame in linkoutput).

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Variable Documentation

g_lwip_netif

struct netif g_lwip_netif

static