tcpip.c File Reference

#include "lwip/opt.h"
#include "lwip/sys.h"
#include "lwip/memp.h"
#include "lwip/mem.h"
#include "lwip/pbuf.h"
#include "lwip/tcpip.h"
#include "lwip/init.h"
#include "netif/etharp.h"
#include "netif/ppp_oe.h"

Include dependency graph for tcpip.c:

Go to the source code of this file.

Functions
static void	tcpip_thread (void *arg)
err_t	tcpip_input (struct pbuf *p, struct netif *inp)
err_t	tcpip_callback_with_block (tcpip_callback_fn function, void *ctx, u8_t block)
struct tcpip_callback_msg *	tcpip_callbackmsg_new (tcpip_callback_fn function, void *ctx)
void	tcpip_callbackmsg_delete (struct tcpip_callback_msg *msg)
err_t	tcpip_trycallback (struct tcpip_callback_msg *msg)
void	tcpip_init (tcpip_init_done_fn initfunc, void *arg)
static void	pbuf_free_int (void *p)
err_t	pbuf_free_callback (struct pbuf *p)
err_t	mem_free_callback (void *m)

Variables
static tcpip_init_done_fn	tcpip_init_done
static void *	tcpip_init_done_arg
static sys_mbox_t	mbox

Detailed Description

Sequential API Main thread module

Definition in file tcpip.c.

Function Documentation

mem_free_callback()

err_t mem_free_callback

(

void *

m

)

A simple wrapper function that allows you to free heap memory from interrupt context.

Parameters

m	the heap memory to free

Returns

ERR_OK if callback could be enqueued, an err_t if not

Definition at line 509 of file tcpip.c.

{
  return tcpip_callback_with_block(mem_free, m, 0);
}

pbuf_free_callback()

err_t pbuf_free_callback

(

struct pbuf *

p

)

A simple wrapper function that allows you to free a pbuf from interrupt context.

Parameters

p	The pbuf (chain) to be dereferenced.

Returns

ERR_OK if callback could be enqueued, an err_t if not

Definition at line 496 of file tcpip.c.

{
  return tcpip_callback_with_block(pbuf_free_int, p, 0);
}

Referenced by LibTCPGetDataFromConnectionQueue().

pbuf_free_int()

static void pbuf_free_int ( void *  p )

static

Simple callback function used with tcpip_callback to free a pbuf (pbuf_free has a wrong signature for tcpip_callback)

Parameters

p	The pbuf (chain) to be dereferenced.

Definition at line 483 of file tcpip.c.

{
  struct pbuf *q = (struct pbuf *)p;
  pbuf_free(q);
}

Referenced by pbuf_free_callback().

tcpip_callback_with_block()

err_t tcpip_callback_with_block	(	tcpip_callback_fn	function,
		void *	ctx,
		u8_t	block
	)

Call a specific function in the thread context of tcpip_thread for easy access synchronization. A function called in that way may access lwIP core code without fearing concurrent access.

Parameters

f	the function to call
ctx	parameter passed to f
block	1 to block until the request is posted, 0 to non-blocking mode

Returns

ERR_OK if the function was called, another err_t if not

Definition at line 214 of file tcpip.c.

{
  struct tcpip_msg *msg;
 
  if (sys_mbox_valid(&mbox)) {
    msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
    if (msg == NULL) {
      return ERR_MEM;
    }
 
    msg->type = TCPIP_MSG_CALLBACK;
    msg->msg.cb.function = function;
    msg->msg.cb.ctx = ctx;
    if (block) {
      sys_mbox_post(&mbox, msg);
    } else {
      if (sys_mbox_trypost(&mbox, msg) != ERR_OK) {
        memp_free(MEMP_TCPIP_MSG_API, msg);
        return ERR_MEM;
      }
    }
    return ERR_OK;
  }
  return ERR_VAL;
}

Referenced by LibTCPBind(), LibTCPClose(), LibTCPConnect(), LibTCPFreeSocket(), LibTCPListen(), LibTCPSend(), LibTCPShutdown(), LibTCPSocket(), mem_free_callback(), and pbuf_free_callback().

tcpip_callbackmsg_delete()

void tcpip_callbackmsg_delete

(

struct tcpip_callback_msg *

msg

)

Free a callback message allocated by tcpip_callbackmsg_new().

Parameters

msg	the message to free

Definition at line 428 of file tcpip.c.

{
  memp_free(MEMP_TCPIP_MSG_API, msg);
}

tcpip_callbackmsg_new()

struct tcpip_callback_msg * tcpip_callbackmsg_new	(	tcpip_callback_fn	function,
		void *	ctx
	)

Allocate a structure for a static callback message and initialize it. This is intended to be used to send "static" messages from interrupt context.

Parameters

function	the function to call
ctx	parameter passed to function

Returns

a struct pointer to pass to tcpip_trycallback().

Definition at line 411 of file tcpip.c.

{
  struct tcpip_msg *msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
  if (msg == NULL) {
    return NULL;
  }
  msg->type = TCPIP_MSG_CALLBACK_STATIC;
  msg->msg.cb.function = function;
  msg->msg.cb.ctx = ctx;
  return (struct tcpip_callback_msg*)msg;
}

tcpip_init()

void tcpip_init	(	tcpip_init_done_fn	initfunc,
		void *	arg
	)

Initialize this module:

• initialize all sub modules
• start the tcpip_thread

Parameters

initfunc	a function to call when tcpip_thread is running and finished initializing
arg	argument to pass to initfunc

Definition at line 458 of file tcpip.c.

{
  lwip_init();
 
  tcpip_init_done = initfunc;
  tcpip_init_done_arg = arg;
  if(sys_mbox_new(&mbox, TCPIP_MBOX_SIZE) != ERR_OK) {
    LWIP_ASSERT("failed to create tcpip_thread mbox", 0);
  }
#if LWIP_TCPIP_CORE_LOCKING
  if(sys_mutex_new(&lock_tcpip_core) != ERR_OK) {
    LWIP_ASSERT("failed to create lock_tcpip_core", 0);
  }
#endif /* LWIP_TCPIP_CORE_LOCKING */
 
  sys_thread_new(TCPIP_THREAD_NAME, tcpip_thread, NULL, TCPIP_THREAD_STACKSIZE, TCPIP_THREAD_PRIO);
}

Referenced by LibIPInitialize().

tcpip_input()

err_t tcpip_input	(	struct pbuf *	p,
		struct netif *	inp
	)

Pass a received packet to tcpip_thread for input processing

Parameters

p	the received packet, p->payload pointing to the Ethernet header or to an IP header (if inp doesn't have NETIF_FLAG_ETHARP or NETIF_FLAG_ETHERNET flags)
inp	the network interface on which the packet was received

Definition at line 164 of file tcpip.c.

{
#if LWIP_TCPIP_CORE_LOCKING_INPUT
  err_t ret;
  LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_input: PACKET %p/%p\n", (void *)p, (void *)inp));
  LOCK_TCPIP_CORE();
#if LWIP_ETHERNET
  if (inp->flags & (NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET)) {
    ret = ethernet_input(p, inp);
  } else
#endif /* LWIP_ETHERNET */
  {
    ret = ip_input(p, inp);
  }
  UNLOCK_TCPIP_CORE();
  return ret;
#else /* LWIP_TCPIP_CORE_LOCKING_INPUT */
  struct tcpip_msg *msg;
 
  if (!sys_mbox_valid(&mbox)) {
    return ERR_VAL;
  }
  msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_INPKT);
  if (msg == NULL) {
    return ERR_MEM;
  }
 
  msg->type = TCPIP_MSG_INPKT;
  msg->msg.inp.p = p;
  msg->msg.inp.netif = inp;
  if (sys_mbox_trypost(&mbox, msg) != ERR_OK) {
    memp_free(MEMP_TCPIP_MSG_INPKT, msg);
    return ERR_MEM;
  }
  return ERR_OK;
#endif /* LWIP_TCPIP_CORE_LOCKING_INPUT */
}

Referenced by netif_init(), and TCPRegisterInterface().

tcpip_thread()

static void tcpip_thread ( void *  arg )

static

The main lwIP thread. This thread has exclusive access to lwIP core functions (unless access to them is not locked). Other threads communicate with this thread using message boxes.

It also starts all the timers to make sure they are running in the right thread context.

Parameters

arg	unused argument

Definition at line 77 of file tcpip.c.

{
  struct tcpip_msg *msg;
  LWIP_UNUSED_ARG(arg);
 
  if (tcpip_init_done != NULL) {
    tcpip_init_done(tcpip_init_done_arg);
  }
 
  LOCK_TCPIP_CORE();
  while (1) {                          /* MAIN Loop */
    UNLOCK_TCPIP_CORE();
    LWIP_TCPIP_THREAD_ALIVE();
    /* wait for a message, timeouts are processed while waiting */
    sys_timeouts_mbox_fetch(&mbox, (void **)&msg);
    LOCK_TCPIP_CORE();
    switch (msg->type) {
#if LWIP_NETCONN
    case TCPIP_MSG_API:
      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: API message %p\n", (void *)msg));
      msg->msg.apimsg->function(&(msg->msg.apimsg->msg));
      break;
#endif /* LWIP_NETCONN */
 
#if !LWIP_TCPIP_CORE_LOCKING_INPUT
    case TCPIP_MSG_INPKT:
      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: PACKET %p\n", (void *)msg));
#if LWIP_ETHERNET
      if (msg->msg.inp.netif->flags & (NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET)) {
        ethernet_input(msg->msg.inp.p, msg->msg.inp.netif);
      } else
#endif /* LWIP_ETHERNET */
      {
        ip_input(msg->msg.inp.p, msg->msg.inp.netif);
      }
      memp_free(MEMP_TCPIP_MSG_INPKT, msg);
      break;
#endif /* LWIP_TCPIP_CORE_LOCKING_INPUT */
 
#if LWIP_NETIF_API
    case TCPIP_MSG_NETIFAPI:
      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: Netif API message %p\n", (void *)msg));
      msg->msg.netifapimsg->function(&(msg->msg.netifapimsg->msg));
      break;
#endif /* LWIP_NETIF_API */
 
#if LWIP_TCPIP_TIMEOUT
    case TCPIP_MSG_TIMEOUT:
      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: TIMEOUT %p\n", (void *)msg));
      sys_timeout(msg->msg.tmo.msecs, msg->msg.tmo.h, msg->msg.tmo.arg);
      memp_free(MEMP_TCPIP_MSG_API, msg);
      break;
    case TCPIP_MSG_UNTIMEOUT:
      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: UNTIMEOUT %p\n", (void *)msg));
      sys_untimeout(msg->msg.tmo.h, msg->msg.tmo.arg);
      memp_free(MEMP_TCPIP_MSG_API, msg);
      break;
#endif /* LWIP_TCPIP_TIMEOUT */
 
    case TCPIP_MSG_CALLBACK:
      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: CALLBACK %p\n", (void *)msg));
      msg->msg.cb.function(msg->msg.cb.ctx);
      memp_free(MEMP_TCPIP_MSG_API, msg);
      break;
 
    case TCPIP_MSG_CALLBACK_STATIC:
      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: CALLBACK_STATIC %p\n", (void *)msg));
      msg->msg.cb.function(msg->msg.cb.ctx);
      break;
 
    default:
      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: invalid message: %d\n", msg->type));
      LWIP_ASSERT("tcpip_thread: invalid message", 0);
      break;
    }
  }
}

Referenced by tcpip_init().

tcpip_trycallback()

err_t tcpip_trycallback

(

struct tcpip_callback_msg *

msg

)

Try to post a callback-message to the tcpip_thread mbox This is intended to be used to send "static" messages from interrupt context.

Parameters

msg	pointer to the message to post

Returns

sys_mbox_trypost() return code

Definition at line 441 of file tcpip.c.

{
  if (!sys_mbox_valid(&mbox)) {
    return ERR_VAL;
  }
  return sys_mbox_trypost(&mbox, msg);
}

Variable Documentation

mbox

sys_mbox_t mbox

static

Definition at line 58 of file tcpip.c.

Referenced by sys_arch_mbox_fetch(), sys_arch_mbox_tryfetch(), sys_mbox_free(), sys_mbox_new(), sys_mbox_post(), sys_mbox_set_invalid(), sys_mbox_trypost(), sys_mbox_valid(), tcpip_callback_with_block(), tcpip_init(), tcpip_input(), tcpip_thread(), and tcpip_trycallback().

tcpip_init_done

tcpip_init_done_fn tcpip_init_done

static

Definition at line 56 of file tcpip.c.

Referenced by tcpip_init(), and tcpip_thread().

tcpip_init_done_arg

void* tcpip_init_done_arg

static

Definition at line 57 of file tcpip.c.

Referenced by tcpip_init(), and tcpip_thread().