source: mainline/uspace/lib/c/generic/inet.c@ 35b8bfe

/*
 * Copyright (c) 2013 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.
 */

#include <async.h>
#include <assert.h>
#include <errno.h>
#include <inet/inet.h>
#include <ipc/inet.h>
#include <ipc/services.h>
#include <loc.h>
#include <stdlib.h>

static void inet_cb_conn(ipc_callid_t iid, ipc_call_t *icall, void *arg);

static async_sess_t *inet_sess = NULL;
static inet_ev_ops_t *inet_ev_ops = NULL;
static uint8_t inet_protocol = 0;

static int inet_callback_create(void)
{
        async_exch_t *exch = async_exchange_begin(inet_sess);
        
        ipc_call_t answer;
        aid_t req = async_send_0(exch, INET_CALLBACK_CREATE, &answer);
        int rc = async_connect_to_me(exch, 0, 0, 0, inet_cb_conn, NULL);
        async_exchange_end(exch);
        
        if (rc != EOK)
                return rc;
        
        sysarg_t retval;
        async_wait_for(req, &retval);
        
        return retval;
}

static int inet_set_proto(uint8_t protocol)
{
        async_exch_t *exch = async_exchange_begin(inet_sess);
        int rc = async_req_1_0(exch, INET_SET_PROTO, protocol);
        async_exchange_end(exch);
        
        return rc;
}

int inet_init(uint8_t protocol, inet_ev_ops_t *ev_ops)
{
        service_id_t inet_svc;
        int rc;

        assert(inet_sess == NULL);
        assert(inet_ev_ops == NULL);
        assert(inet_protocol == 0);
        
        rc = loc_service_get_id(SERVICE_NAME_INET, &inet_svc,
            IPC_FLAG_BLOCKING);
        if (rc != EOK)
                return ENOENT;
        
        inet_sess = loc_service_connect(EXCHANGE_SERIALIZE, inet_svc,
            IPC_FLAG_BLOCKING);
        if (inet_sess == NULL)
                return ENOENT;
        
        if (inet_set_proto(protocol) != EOK) {
                async_hangup(inet_sess);
                inet_sess = NULL;
                return EIO;
        }
        
        if (inet_callback_create() != EOK) {
                async_hangup(inet_sess);
                inet_sess = NULL;
                return EIO;
        }
        
        inet_protocol = protocol;
        inet_ev_ops = ev_ops;

        return EOK;
}

int inet_send(inet_dgram_t *dgram, uint8_t ttl, inet_df_t df)
{
        async_exch_t *exch = async_exchange_begin(inet_sess);
        
        ipc_call_t answer;
        aid_t req = async_send_4(exch, INET_SEND, dgram->iplink, dgram->tos,
            ttl, df, &answer);
        
        int rc = async_data_write_start(exch, &dgram->src, sizeof(inet_addr_t));
        if (rc != EOK) {
                async_exchange_end(exch);
                async_forget(req);
                return rc;
        }
        
        rc = async_data_write_start(exch, &dgram->dest, sizeof(inet_addr_t));
        if (rc != EOK) {
                async_exchange_end(exch);
                async_forget(req);
                return rc;
        }
        
        rc = async_data_write_start(exch, dgram->data, dgram->size);
        
        async_exchange_end(exch);
        
        if (rc != EOK) {
                async_forget(req);
                return rc;
        }
        
        sysarg_t retval;
        async_wait_for(req, &retval);
        
        return (int) retval;
}

int inet_get_srcaddr(inet_addr_t *remote, uint8_t tos, inet_addr_t *local)
{
        async_exch_t *exch = async_exchange_begin(inet_sess);
        
        ipc_call_t answer;
        aid_t req = async_send_1(exch, INET_GET_SRCADDR, tos, &answer);
        
        int rc = async_data_write_start(exch, remote, sizeof(inet_addr_t));
        if (rc != EOK) {
                async_exchange_end(exch);
                async_forget(req);
                return rc;
        }
        
        rc = async_data_read_start(exch, local, sizeof(inet_addr_t));
        
        async_exchange_end(exch);
        
        if (rc != EOK) {
                async_forget(req);
                return rc;
        }
        
        sysarg_t retval;
        async_wait_for(req, &retval);
        
        return (int) retval;
}

static void inet_ev_recv(ipc_callid_t iid, ipc_call_t *icall)
{
        inet_dgram_t dgram;
        
        dgram.tos = IPC_GET_ARG1(*icall);
        
        ipc_callid_t callid;
        size_t size;
        if (!async_data_write_receive(&callid, &size)) {
                async_answer_0(callid, EINVAL);
                async_answer_0(iid, EINVAL);
                return;
        }
        
        if (size != sizeof(inet_addr_t)) {
                async_answer_0(callid, EINVAL);
                async_answer_0(iid, EINVAL);
                return;
        }
        
        int rc = async_data_write_finalize(callid, &dgram.src, size);
        if (rc != EOK) {
                async_answer_0(callid, rc);
                async_answer_0(iid, rc);
                return;
        }
        
        if (!async_data_write_receive(&callid, &size)) {
                async_answer_0(callid, EINVAL);
                async_answer_0(iid, EINVAL);
                return;
        }
        
        if (size != sizeof(inet_addr_t)) {
                async_answer_0(callid, EINVAL);
                async_answer_0(iid, EINVAL);
                return;
        }
        
        rc = async_data_write_finalize(callid, &dgram.dest, size);
        if (rc != EOK) {
                async_answer_0(callid, rc);
                async_answer_0(iid, rc);
                return;
        }
        
        rc = async_data_write_accept(&dgram.data, false, 0, 0, 0, &dgram.size);
        if (rc != EOK) {
                async_answer_0(iid, rc);
                return;
        }
        
        rc = inet_ev_ops->recv(&dgram);
        free(dgram.data);
        async_answer_0(iid, rc);
}

static void inet_cb_conn(ipc_callid_t iid, ipc_call_t *icall, void *arg)
{
        while (true) {
                ipc_call_t call;
                ipc_callid_t callid = async_get_call(&call);
                
                if (!IPC_GET_IMETHOD(call)) {
                        /* TODO: Handle hangup */
                        return;
                }
                
                switch (IPC_GET_IMETHOD(call)) {
                case INET_EV_RECV:
                        inet_ev_recv(callid, &call);
                        break;
                default:
                        async_answer_0(callid, ENOTSUP);
                }
        }
}

/** @}
 */