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contiki/core/net/ipv4/uip-over-mesh.c

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/*
* Copyright (c) 2007, 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.
*
*/
/**
* \file
* Code for tunnelling uIP packets over the Rime mesh routing module
* \author
* Adam Dunkels <adam@sics.se>
*/
#include <stdio.h>
#include "net/ipv4/uip-fw.h"
#include "net/ipv4/uip-over-mesh.h"
#include "net/rime/route-discovery.h"
#include "net/rime/route.h"
#include "net/rime/trickle.h"
#define ROUTE_TRICKLE_INTERVAL CLOCK_SECOND * 32
#define ROUTE_DISCOVERY_INTERVAL CLOCK_SECOND * 4
#define ROUTE_TIMEOUT CLOCK_SECOND * 4
static struct queuebuf *queued_packet;
static linkaddr_t queued_receiver;
/* Connection for route discovery: */
static struct route_discovery_conn route_discovery;
/* Connection for sending data packets to the next hop node: */
static struct unicast_conn dataconn;
/* Connection for sending gateway announcement message to the entire
network: */
static struct trickle_conn gateway_announce_conn;
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
#define BUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
static struct uip_fw_netif *gw_netif;
static linkaddr_t gateway;
static uip_ipaddr_t netaddr, netmask;
/*---------------------------------------------------------------------------*/
static void
recv_data(struct unicast_conn *c, const linkaddr_t *from)
{
struct route_entry *e;
linkaddr_t source;
uip_len = packetbuf_copyto(&uip_buf[UIP_LLH_LEN]);
source.u8[0] = BUF->srcipaddr.u8[2];
source.u8[1] = BUF->srcipaddr.u8[3];
e = route_lookup(&source);
if(e == NULL) {
route_add(&source, from, 10, 0);
} else {
route_refresh(e);
}
/* If we received data via a gateway, we refresh the gateway route.
* Note: we refresh OUR gateway route, although we are not sure it forwarded the data. */
if(!uip_ipaddr_maskcmp(&BUF->srcipaddr, &netaddr, &netmask)) {
e = route_lookup(&gateway);
if(e != NULL) {
route_refresh(e);
}
}
PRINTF("uip-over-mesh: %d.%d: recv_data with len %d\n",
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1], uip_len);
tcpip_input();
}
/*---------------------------------------------------------------------------*/
static void
send_data(linkaddr_t *next)
{
PRINTF("uip-over-mesh: %d.%d: send_data with len %d\n",
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
packetbuf_totlen());
unicast_send(&dataconn, next);
}
/*---------------------------------------------------------------------------*/
static void
new_route(struct route_discovery_conn *c, const linkaddr_t *to)
{
struct route_entry *rt;
if(queued_packet) {
PRINTF("uip-over-mesh: new route, sending queued packet\n");
queuebuf_to_packetbuf(queued_packet);
queuebuf_free(queued_packet);
queued_packet = NULL;
rt = route_lookup(&queued_receiver);
if(rt) {
route_decay(rt);
send_data(&queued_receiver);
}
}
}
/*---------------------------------------------------------------------------*/
static void
timedout(struct route_discovery_conn *c)
{
PRINTF("uip-over-mesh: packet timed out\n");
if(queued_packet) {
PRINTF("uip-over-mesh: freeing queued packet\n");
queuebuf_free(queued_packet);
queued_packet = NULL;
}
}
/*---------------------------------------------------------------------------*/
static const struct unicast_callbacks data_callbacks = { recv_data };
static const struct route_discovery_callbacks rdc = { new_route, timedout };
/*---------------------------------------------------------------------------*/
struct gateway_msg {
linkaddr_t gateway;
};
static uint8_t is_gateway;
static void
gateway_announce_recv(struct trickle_conn *c)
{
struct gateway_msg *msg;
msg = packetbuf_dataptr();
PRINTF("%d.%d: gateway message: %d.%d\n",
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
msg->gateway.u8[0], msg->gateway.u8[1]);
if(!is_gateway) {
uip_over_mesh_set_gateway(&msg->gateway);
}
}
/*---------------------------------------------------------------------------*/
void
uip_over_mesh_make_announced_gateway(void)
{
struct gateway_msg msg;
/* Make this node the gateway node, unless it already is the
gateway. */
if(!is_gateway) {
PRINTF("%d.%d: making myself the gateway\n",
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1]);
uip_over_mesh_set_gateway(&linkaddr_node_addr);
linkaddr_copy(&(msg.gateway), &linkaddr_node_addr);
packetbuf_copyfrom(&msg, sizeof(struct gateway_msg));
trickle_send(&gateway_announce_conn);
is_gateway = 1;
}
}
const static struct trickle_callbacks trickle_call = {gateway_announce_recv};
/*---------------------------------------------------------------------------*/
void
uip_over_mesh_init(uint16_t channels)
{
PRINTF("Our address is %d.%d (%d.%d.%d.%d)\n",
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
uip_hostaddr.u8[0], uip_hostaddr.u8[1],
uip_hostaddr.u8[2], uip_hostaddr.u8[3]);
unicast_open(&dataconn, channels, &data_callbacks);
route_discovery_open(&route_discovery, ROUTE_DISCOVERY_INTERVAL,
channels + 1, &rdc);
trickle_open(&gateway_announce_conn, ROUTE_TRICKLE_INTERVAL, channels + 3,
&trickle_call);
route_init();
/* Set lifetime to 30 seconds for non-refreshed routes. */
route_set_lifetime(30);
}
/*---------------------------------------------------------------------------*/
uint8_t
uip_over_mesh_send(void)
{
linkaddr_t receiver;
struct route_entry *rt;
/* This function is called by the uip-fw module to send out an IP
packet. We try to send the IP packet to the next hop route, or we
queue the packet and send out a route request for the final
receiver of the packet. */
/* Packets destined to this network is sent using mesh, whereas
packets destined to a network outside this network is sent towards
the gateway node. */
if(uip_ipaddr_maskcmp(&BUF->destipaddr, &netaddr, &netmask)) {
receiver.u8[0] = BUF->destipaddr.u8[2];
receiver.u8[1] = BUF->destipaddr.u8[3];
} else {
if(linkaddr_cmp(&gateway, &linkaddr_node_addr)) {
PRINTF("uip_over_mesh_send: I am gateway, packet to %d.%d.%d.%d to local interface\n",
uip_ipaddr_to_quad(&BUF->destipaddr));
if(gw_netif != NULL) {
return gw_netif->output();
}
return UIP_FW_DROPPED;
} else if(linkaddr_cmp(&gateway, &linkaddr_null)) {
PRINTF("uip_over_mesh_send: No gateway setup, dropping packet\n");
return UIP_FW_OK;
} else {
PRINTF("uip_over_mesh_send: forwarding packet to %d.%d.%d.%d towards gateway %d.%d\n",
uip_ipaddr_to_quad(&BUF->destipaddr),
gateway.u8[0], gateway.u8[1]);
linkaddr_copy(&receiver, &gateway);
}
}
PRINTF("uIP over mesh send to %d.%d with len %d\n",
receiver.u8[0], receiver.u8[1],
uip_len);
packetbuf_copyfrom(&uip_buf[UIP_LLH_LEN], uip_len);
/* Send TCP data with the PACKETBUF_ATTR_ERELIABLE set so that
an underlying power-saving MAC layer knows that it should be
waiting for an ACK. */
if(BUF->proto == UIP_PROTO_TCP) {
packetbuf_set_attr(PACKETBUF_ATTR_ERELIABLE, 1);
packetbuf_set_attr(PACKETBUF_ATTR_RELIABLE, 1);
/* packetbuf_set_attr(PACKETBUF_ATTR_PACKET_TYPE, PACKETBUF_ATTR_PACKET_TYPE_STREAM);*/
}
rt = route_lookup(&receiver);
if(rt == NULL) {
PRINTF("uIP over mesh no route to %d.%d\n", receiver.u8[0], receiver.u8[1]);
if(queued_packet == NULL) {
queued_packet = queuebuf_new_from_packetbuf();
linkaddr_copy(&queued_receiver, &receiver);
route_discovery_discover(&route_discovery, &receiver, ROUTE_TIMEOUT);
} else if(!linkaddr_cmp(&queued_receiver, &receiver)) {
route_discovery_discover(&route_discovery, &receiver, ROUTE_TIMEOUT);
}
} else {
route_decay(rt);
send_data(&rt->nexthop);
}
return UIP_FW_OK;
}
/*---------------------------------------------------------------------------*/
void
uip_over_mesh_set_gateway_netif(struct uip_fw_netif *n)
{
gw_netif = n;
}
/*---------------------------------------------------------------------------*/
void
uip_over_mesh_set_gateway(linkaddr_t *gw)
{
linkaddr_copy(&gateway, gw);
}
/*---------------------------------------------------------------------------*/
void
uip_over_mesh_set_net(uip_ipaddr_t *addr, uip_ipaddr_t *mask)
{
uip_ipaddr_copy(&netaddr, addr);
uip_ipaddr_copy(&netmask, mask);
}
/*---------------------------------------------------------------------------*/
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