osd-contiki/core/net/tcpip.c
oliverschmidt 5f3296e943 Changed packet drivers from services to plain processes.
Now tcpip_output() is a function pointer that is supposed to be set via the macro tcpip_set_outputfunc(). Packet drivers do so on process startup.

Thus if there are several packet drivers in a Contiki system the one started last is the one actually used. This behaviour is especially useful for the 'IP forwarding' "meta" packet driver.
2007-05-20 21:29:39 +00:00

403 lines
9.4 KiB
C

/*
* Copyright (c) 2004, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* Author: Adam Dunkels <adam@sics.se>
*
* $Id: tcpip.c,v 1.8 2007/05/20 21:29:39 oliverschmidt Exp $
*/
#include "contiki-net.h"
#include "net/uip-split.h"
#include <string.h>
process_event_t tcpip_event;
/**
* \internal Structure for holding a TCP port and a process ID.
*/
struct listenport {
u16_t port;
struct process *p;
};
/*static struct tcpip_event_args ev_args;*/
static struct etimer periodic;
static struct internal_state {
struct listenport listenports[UIP_LISTENPORTS];
struct process *p;
} s;
enum {
TCP_POLL,
UDP_POLL,
PACKET_INPUT
};
u8_t (* tcpip_output)(void); /* Called on IP packet output. */
unsigned char tcpip_do_forwarding; /* Forwarding enabled. */
unsigned char tcpip_is_forwarding; /* Forwarding right now? */
PROCESS(tcpip_process, "TCP/IP stack");
/*---------------------------------------------------------------------------*/
static void
packet_input(void)
{
if(uip_len > 0) {
if(tcpip_do_forwarding) {
tcpip_is_forwarding = 1;
if(uip_fw_forward() == UIP_FW_LOCAL) {
tcpip_is_forwarding = 0;
uip_input();
if(uip_len > 0) {
#if UIP_CONF_TCP_SPLIT
uip_split_output();
#else
tcpip_output();
#endif
}
}
tcpip_is_forwarding = 0;
} else {
uip_input();
if(uip_len > 0) {
#if UIP_CONF_TCP_SPLIT
uip_split_output();
#else
tcpip_output();
#endif
}
}
}
}
/*---------------------------------------------------------------------------*/
struct uip_conn *
tcp_connect(uip_ipaddr_t *ripaddr, u16_t port, void *appstate)
{
struct uip_conn *c;
c = uip_connect(ripaddr, port);
if(c == NULL) {
return NULL;
}
c->appstate.p = PROCESS_CURRENT();
c->appstate.state = appstate;
tcpip_poll_tcp(c);
return c;
}
/*---------------------------------------------------------------------------*/
void
tcp_unlisten(u16_t port)
{
static unsigned char i;
struct listenport *l;
l = s.listenports;
for(i = 0; i < UIP_LISTENPORTS; ++i) {
if(l->port == port &&
l->p == PROCESS_CURRENT()) {
l->port = 0;
uip_unlisten(port);
break;
}
++l;
}
}
/*---------------------------------------------------------------------------*/
void
tcp_listen(u16_t port)
{
static unsigned char i;
struct listenport *l;
l = s.listenports;
for(i = 0; i < UIP_LISTENPORTS; ++i) {
if(l->port == 0) {
l->port = port;
l->p = PROCESS_CURRENT();
uip_listen(port);
break;
}
++l;
}
}
/*---------------------------------------------------------------------------*/
void
tcp_attach(struct uip_conn *conn,
void *appstate)
{
register uip_tcp_appstate_t *s;
s = &conn->appstate;
s->p = PROCESS_CURRENT();
s->state = appstate;
}
/*---------------------------------------------------------------------------*/
void
udp_attach(struct uip_udp_conn *conn,
void *appstate)
{
register uip_udp_appstate_t *s;
s = &conn->appstate;
s->p = PROCESS_CURRENT();
s->state = appstate;
}
/*---------------------------------------------------------------------------*/
struct uip_udp_conn *
udp_new(const uip_ipaddr_t *ripaddr, u16_t port, void *appstate)
{
struct uip_udp_conn *c;
uip_udp_appstate_t *s;
c = uip_udp_new(ripaddr, port);
if(c == NULL) {
return NULL;
}
s = &c->appstate;
s->p = PROCESS_CURRENT();
s->state = appstate;
return c;
}
/*---------------------------------------------------------------------------*/
struct uip_udp_conn *
udp_broadcast_new(u16_t port, void *appstate)
{
uip_ipaddr_t addr;
struct uip_udp_conn *conn;
uip_ipaddr(&addr, 255,255,255,255);
conn = udp_new(&addr, port, appstate);
if(conn != NULL) {
udp_bind(conn, port);
}
return conn;
}
/*---------------------------------------------------------------------------*/
static void
eventhandler(process_event_t ev, process_data_t data)
{
static unsigned char i;
register struct listenport *l;
struct process *p;
switch(ev) {
case PROCESS_EVENT_EXITED:
/* This is the event we get if a process has exited. We go through
the TCP/IP tables to see if this process had any open
connections or listening TCP ports. If so, we'll close those
connections. */
p = (struct process *)data;
l = s.listenports;
for(i = 0; i < UIP_LISTENPORTS; ++i) {
if(l->p == p) {
uip_unlisten(l->port);
l->port = 0;
l->p = PROCESS_NONE;
}
++l;
}
{
register struct uip_conn *cptr;
for(cptr = &uip_conns[0]; cptr < &uip_conns[UIP_CONNS]; ++cptr) {
if(cptr->appstate.p == p) {
cptr->appstate.p = PROCESS_NONE;
cptr->tcpstateflags = UIP_CLOSED;
}
}
}
#if UIP_UDP
{
register struct uip_udp_conn *cptr;
for(cptr = &uip_udp_conns[0];
cptr < &uip_udp_conns[UIP_UDP_CONNS]; ++cptr) {
if(cptr->appstate.p == p) {
cptr->lport = 0;
}
}
}
#endif /* UIP_UDP */
break;
case PROCESS_EVENT_TIMER:
/* We get this event if one of our timers have expired. */
{
static unsigned char i;
/* Check the clock so see if we should call the periodic uIP
processing. */
if(etimer_expired(&periodic)) {
for(i = 0; i < UIP_CONNS; ++i) {
if(uip_conn_active(i)) {
/* Only restart the timer if there are active
connections. */
etimer_restart(&periodic);
uip_periodic(i);
if(uip_len > 0) {
tcpip_output();
}
}
}
/* for(i = 0; i < UIP_UDP_CONNS; i++) {
uip_udp_periodic(i);
if(uip_len > 0) {
tcpip_output();
}
}*/
uip_fw_periodic();
}
}
break;
case TCP_POLL:
if(data != NULL) {
uip_poll_conn(data);
if(uip_len > 0) {
tcpip_output();
}
/* Start the periodic polling, if it isn't already active. */
if(etimer_expired(&periodic)) {
etimer_restart(&periodic);
}
}
break;
case UDP_POLL:
if(data != NULL) {
uip_udp_periodic_conn(data);
if(uip_len > 0) {
tcpip_output();
}
}
break;
case PACKET_INPUT:
packet_input();
break;
};
}
/*---------------------------------------------------------------------------*/
void
tcpip_input(void)
{
process_post_synch(&tcpip_process, PACKET_INPUT, NULL);
uip_len = 0;
}
/*---------------------------------------------------------------------------*/
void
tcpip_poll_udp(struct uip_udp_conn *conn)
{
process_post(&tcpip_process, UDP_POLL, conn);
}
/*---------------------------------------------------------------------------*/
void
tcpip_poll_tcp(struct uip_conn *conn)
{
process_post(&tcpip_process, TCP_POLL, conn);
}
/*---------------------------------------------------------------------------*/
void
tcpip_uipcall(void)
{
register uip_udp_appstate_t *ts;
static unsigned char i;
register struct listenport *l;
if(uip_conn != NULL) {
ts = &uip_conn->appstate;
} else {
ts = &uip_udp_conn->appstate;
}
/* If this is a connection request for a listening port, we must
mark the connection with the right process ID. */
if(uip_connected()) {
l = &s.listenports[0];
for(i = 0; i < UIP_LISTENPORTS; ++i) {
if(l->port == uip_conn->lport &&
l->p != PROCESS_NONE) {
ts->p = l->p;
ts->state = NULL;
break;
}
++l;
}
/* Start the periodic polling, if it isn't already active. */
if(etimer_expired(&periodic)) {
etimer_restart(&periodic);
}
}
if(ts->p != NULL) {
process_post_synch(ts->p, tcpip_event, ts->state);
}
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(tcpip_process, ev, data)
{
int i;
PROCESS_BEGIN();
for(i = 0; i < UIP_LISTENPORTS; ++i) {
s.listenports[i].port = 0;
}
s.p = PROCESS_CURRENT();
tcpip_event = process_alloc_event();
etimer_set(&periodic, CLOCK_SECOND/2);
uip_init();
while(1) {
PROCESS_YIELD();
eventhandler(ev, data);
}
PROCESS_END();
}