source: mainline/uspace/srv/net/inetsrv/inet_link.c@ b4ec1ea

/*
 * Copyright (c) 2012 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/** @addtogroup inet
 * @{
 */
/**
 * @file
 * @brief
 */

#include <bool.h>
#include <errno.h>
#include <fibril_synch.h>
#include <inet/iplink.h>
#include <io/log.h>
#include <loc.h>
#include <stdlib.h>
#include <str.h>

#include "addrobj.h"
#include "inetsrv.h"
#include "inet_link.h"
#include "pdu.h"

static int inet_link_open(service_id_t sid);
static int inet_iplink_recv(iplink_t *ilink, iplink_sdu_t *sdu);

static iplink_ev_ops_t inet_iplink_ev_ops = {
        .recv = inet_iplink_recv
};

static LIST_INITIALIZE(inet_link_list);
static FIBRIL_MUTEX_INITIALIZE(inet_discovery_lock);

static int inet_iplink_recv(iplink_t *iplink, iplink_sdu_t *sdu)
{
        inet_packet_t packet;
        int rc;

        log_msg(LVL_DEBUG, "inet_iplink_recv()");
        rc = inet_pdu_decode(sdu->data, sdu->size, &packet);
        if (rc != EOK) {
                log_msg(LVL_DEBUG, "failed decoding PDU");
                return rc;
        }

        log_msg(LVL_DEBUG, "call inet_recv_packet()");
        rc = inet_recv_packet(&packet);
        log_msg(LVL_DEBUG, "call inet_recv_packet -> %d", rc);
        free(packet.data);

        return rc;
}

static int inet_link_check_new(void)
{
        bool already_known;
        category_id_t iplink_cat;
        service_id_t *svcs;
        size_t count, i;
        int rc;

        fibril_mutex_lock(&inet_discovery_lock);

        rc = loc_category_get_id("iplink", &iplink_cat, IPC_FLAG_BLOCKING);
        if (rc != EOK) {
                log_msg(LVL_ERROR, "Failed resolving category 'iplink'.");
                fibril_mutex_unlock(&inet_discovery_lock);
                return ENOENT;
        }

        rc = loc_category_get_svcs(iplink_cat, &svcs, &count);
        if (rc != EOK) {
                log_msg(LVL_ERROR, "Failed getting list of IP links.");
                fibril_mutex_unlock(&inet_discovery_lock);
                return EIO;
        }

        for (i = 0; i < count; i++) {
                already_known = false;

                list_foreach(inet_link_list, ilink_link) {
                        inet_link_t *ilink = list_get_instance(ilink_link,
                            inet_link_t, link_list);
                        if (ilink->svc_id == svcs[i]) {
                                already_known = true;
                                break;
                        }
                }

                if (!already_known) {
                        log_msg(LVL_DEBUG, "Found IP link '%lu'",
                            (unsigned long) svcs[i]);
                        rc = inet_link_open(svcs[i]);
                        if (rc != EOK)
                                log_msg(LVL_ERROR, "Could not open IP link.");
                }
        }

        fibril_mutex_unlock(&inet_discovery_lock);
        return EOK;
}

static inet_link_t *inet_link_new(void)
{
        inet_link_t *ilink = calloc(1, sizeof(inet_link_t));

        if (ilink == NULL) {
                log_msg(LVL_ERROR, "Failed allocating link structure. "
                    "Out of memory.");
                return NULL;
        }

        link_initialize(&ilink->link_list);

        return ilink;
}

static void inet_link_delete(inet_link_t *ilink)
{
        if (ilink->svc_name != NULL)
                free(ilink->svc_name);
        free(ilink);
}

static int inet_link_open(service_id_t sid)
{
        inet_link_t *ilink;
        iplink_addr_t iaddr;
        int rc;

        log_msg(LVL_DEBUG, "inet_link_open()");
        ilink = inet_link_new();
        if (ilink == NULL)
                return ENOMEM;

        ilink->svc_id = sid;
        ilink->iplink = NULL;

        rc = loc_service_get_name(sid, &ilink->svc_name);
        if (rc != EOK) {
                log_msg(LVL_ERROR, "Failed getting service name.");
                goto error;
        }

        ilink->sess = loc_service_connect(EXCHANGE_SERIALIZE, sid, 0);
        if (ilink->sess == NULL) {
                log_msg(LVL_ERROR, "Failed connecting '%s'", ilink->svc_name);
                goto error;
        }

        rc = iplink_open(ilink->sess, &inet_iplink_ev_ops, &ilink->iplink);
        if (rc != EOK) {
                log_msg(LVL_ERROR, "Failed opening IP link '%s'",
                    ilink->svc_name);
                goto error;
        }

        rc = iplink_get_mtu(ilink->iplink, &ilink->def_mtu);
        if (rc != EOK) {
                log_msg(LVL_ERROR, "Failed determinning MTU of link '%s'",
                    ilink->svc_name);
                goto error;
        }

        log_msg(LVL_DEBUG, "Opened IP link '%s'", ilink->svc_name);
        list_append(&ilink->link_list, &inet_link_list);

        inet_addrobj_t *addr;

        static int first = 1;
        /* XXX For testing: set static IP address 192.168.0.4/24 */
        addr = inet_addrobj_new();
        if (first) {
                addr->naddr.ipv4 = (127 << 24) + (0 << 16) + (0 << 8) + 1;
                first = 0;
        } else {
                addr->naddr.ipv4 = (192 << 24) + (168 << 16) + (0 << 8) + 4;
        }
        addr->naddr.bits = 24;
        addr->ilink = ilink;
        addr->name = str_dup("v4a");
        inet_addrobj_add(addr);

        iaddr.ipv4 = addr->naddr.ipv4;
        rc = iplink_addr_add(ilink->iplink, &iaddr);
        if (rc != EOK) {
                log_msg(LVL_ERROR, "Failed setting IP address on internet link.");
                /* XXX Roll back */
                return rc;
        }

        return EOK;

error:
        if (ilink->iplink != NULL)
                iplink_close(ilink->iplink);
        inet_link_delete(ilink);
        return rc;
}

static void inet_link_cat_change_cb(void)
{
        (void) inet_link_check_new();
}

int inet_link_discovery_start(void)
{
        int rc;

        rc = loc_register_cat_change_cb(inet_link_cat_change_cb);
        if (rc != EOK) {
                log_msg(LVL_ERROR, "Failed registering callback for IP link "
                    "discovery (%d).", rc);
                return rc;
        }

        return inet_link_check_new();
}

/** Send datagram over Internet link */
int inet_link_send_dgram(inet_link_t *ilink, inet_addr_t *lsrc,
    inet_addr_t *ldest, inet_dgram_t *dgram, uint8_t proto, uint8_t ttl, int df)
{
        iplink_sdu_t sdu;
        inet_packet_t packet;
        int rc;
        size_t offs, roffs;

        /*
         * Fill packet structure. Fragmentation is performed by
         * inet_pdu_encode().
         */
        packet.src = dgram->src;
        packet.dest = dgram->dest;
        packet.tos = dgram->tos;
        packet.proto = proto;
        packet.ttl = ttl;
        packet.df = df;
        packet.data = dgram->data;
        packet.size = dgram->size;

        sdu.lsrc.ipv4 = lsrc->ipv4;
        sdu.ldest.ipv4 = ldest->ipv4;

        offs = 0;
        do {
                /* Encode one fragment */
                rc = inet_pdu_encode(&packet, offs, ilink->def_mtu, &sdu.data,
                    &sdu.size, &roffs);
                if (rc != EOK)
                        return rc;

                /* Send the PDU */
                rc = iplink_send(ilink->iplink, &sdu);
                free(sdu.data);

                offs = roffs;
        } while (offs < packet.size);

        return rc;
}

inet_link_t *inet_link_get_by_id(sysarg_t link_id)
{
        fibril_mutex_lock(&inet_discovery_lock);

        list_foreach(inet_link_list, elem) {
                inet_link_t *ilink = list_get_instance(elem, inet_link_t,
                    link_list);

                if (ilink->svc_id == link_id) {
                        fibril_mutex_unlock(&inet_discovery_lock);
                        return ilink;
                }
        }

        fibril_mutex_unlock(&inet_discovery_lock);
        return NULL;
}

/** @}
 */