source: mainline/uspace/srv/net/inetsrv/inetsrv.c@ eec201d

/*
 * 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 Internet Protocol service
 */

#include <adt/list.h>
#include <async.h>
#include <errno.h>
#include <str_error.h>
#include <fibril_synch.h>
#include <io/log.h>
#include <ipc/inet.h>
#include <ipc/services.h>
#include <loc.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdint.h>
#include <task.h>
#include "addrobj.h"
#include "icmp.h"
#include "icmp_std.h"
#include "icmpv6.h"
#include "icmpv6_std.h"
#include "inetsrv.h"
#include "inetcfg.h"
#include "inetping.h"
#include "inet_link.h"
#include "reass.h"
#include "sroute.h"

#define NAME "inetsrv"

static inet_naddr_t solicited_node_mask = {
        .version = ip_v6,
        .addr6 = { 0xff, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x01, 0xff, 0, 0, 0 },
        .prefix = 104
};

static inet_addr_t broadcast4_all_hosts = {
        .version = ip_v4,
        .addr = 0xffffffff
};

static inet_addr_t multicast_all_nodes = {
        .version = ip_v6,
        .addr6 = { 0xff, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x01 }
};

static FIBRIL_MUTEX_INITIALIZE(client_list_lock);
static LIST_INITIALIZE(client_list);

static void inet_default_conn(ipc_call_t *, void *);

static errno_t inet_init(void)
{
        log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_init()");

        port_id_t port;
        errno_t rc = async_create_port(INTERFACE_INET,
            inet_default_conn, NULL, &port);
        if (rc != EOK)
                return rc;

        rc = async_create_port(INTERFACE_INETCFG,
            inet_cfg_conn, NULL, &port);
        if (rc != EOK)
                return rc;

        rc = async_create_port(INTERFACE_INETPING,
            inetping_conn, NULL, &port);
        if (rc != EOK)
                return rc;

        rc = loc_server_register(NAME);
        if (rc != EOK) {
                log_msg(LOG_DEFAULT, LVL_ERROR, "Failed registering server: %s.", str_error(rc));
                return EEXIST;
        }

        service_id_t sid;
        rc = loc_service_register(SERVICE_NAME_INET, &sid);
        if (rc != EOK) {
                log_msg(LOG_DEFAULT, LVL_ERROR, "Failed registering service: %s.", str_error(rc));
                return EEXIST;
        }

        return EOK;
}

static void inet_callback_create_srv(inet_client_t *client, ipc_call_t *call)
{
        log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_callback_create_srv()");

        async_sess_t *sess = async_callback_receive(EXCHANGE_SERIALIZE);
        if (sess == NULL) {
                async_answer_0(call, ENOMEM);
                return;
        }

        client->sess = sess;
        async_answer_0(call, EOK);
}

static errno_t inet_find_dir(inet_addr_t *src, inet_addr_t *dest, uint8_t tos,
    inet_dir_t *dir)
{
        inet_sroute_t *sr;

        /* XXX Handle case where source address is specified */
        (void) src;

        dir->aobj = inet_addrobj_find(dest, iaf_net);
        if (dir->aobj != NULL) {
                dir->ldest = *dest;
                dir->dtype = dt_direct;
        } else {
                /* No direct path, try using a static route */
                sr = inet_sroute_find(dest);
                if (sr != NULL) {
                        dir->aobj = inet_addrobj_find(&sr->router, iaf_net);
                        dir->ldest = sr->router;
                        dir->dtype = dt_router;
                }
        }

        if (dir->aobj == NULL) {
                log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_send: No route to destination.");
                return ENOENT;
        }

        return EOK;
}

errno_t inet_route_packet(inet_dgram_t *dgram, uint8_t proto, uint8_t ttl,
    int df)
{
        inet_dir_t dir;
        inet_link_t *ilink;
        errno_t rc;

        if (dgram->iplink != 0) {
                /* XXX TODO - IPv6 */
                log_msg(LOG_DEFAULT, LVL_DEBUG, "dgram directly to iplink %zu",
                    dgram->iplink);
                /* Send packet directly to the specified IP link */
                ilink = inet_link_get_by_id(dgram->iplink);
                if (ilink == 0)
                        return ENOENT;

                if (dgram->src.version != ip_v4 ||
                    dgram->dest.version != ip_v4)
                        return EINVAL;

                return inet_link_send_dgram(ilink, dgram->src.addr,
                    dgram->dest.addr, dgram, proto, ttl, df);
        }

        log_msg(LOG_DEFAULT, LVL_DEBUG, "dgram to be routed");

        /* Route packet using source/destination addresses */

        rc = inet_find_dir(&dgram->src, &dgram->dest, dgram->tos, &dir);
        if (rc != EOK)
                return rc;

        return inet_addrobj_send_dgram(dir.aobj, &dir.ldest, dgram,
            proto, ttl, df);
}

static errno_t inet_send(inet_client_t *client, inet_dgram_t *dgram,
    uint8_t proto, uint8_t ttl, int df)
{
        return inet_route_packet(dgram, proto, ttl, df);
}

errno_t inet_get_srcaddr(inet_addr_t *remote, uint8_t tos, inet_addr_t *local)
{
        inet_dir_t dir;
        errno_t rc;

        rc = inet_find_dir(NULL, remote, tos, &dir);
        if (rc != EOK)
                return rc;

        /* XXX dt_local? */

        /* Take source address from the address object */
        if (remote->version == ip_v4 && remote->addr == 0xffffffff) {
                /* XXX TODO - IPv6 */
                local->version = ip_v4;
                local->addr = 0;
                return EOK;
        }

        inet_naddr_addr(&dir.aobj->naddr, local);
        return EOK;
}

static void inet_get_srcaddr_srv(inet_client_t *client, ipc_call_t *icall)
{
        log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_get_srcaddr_srv()");

        uint8_t tos = IPC_GET_ARG1(*icall);

        ipc_call_t call;
        size_t size;
        if (!async_data_write_receive(&call, &size)) {
                async_answer_0(&call, EREFUSED);
                async_answer_0(icall, EREFUSED);
                return;
        }

        if (size != sizeof(inet_addr_t)) {
                async_answer_0(&call, EINVAL);
                async_answer_0(icall, EINVAL);
                return;
        }

        inet_addr_t remote;
        errno_t rc = async_data_write_finalize(&call, &remote, size);
        if (rc != EOK) {
                async_answer_0(&call, rc);
                async_answer_0(icall, rc);
        }

        inet_addr_t local;
        rc = inet_get_srcaddr(&remote, tos, &local);
        if (rc != EOK) {
                async_answer_0(icall, rc);
                return;
        }

        if (!async_data_read_receive(&call, &size)) {
                async_answer_0(&call, EREFUSED);
                async_answer_0(icall, EREFUSED);
                return;
        }

        if (size != sizeof(inet_addr_t)) {
                async_answer_0(&call, EINVAL);
                async_answer_0(icall, EINVAL);
                return;
        }

        rc = async_data_read_finalize(&call, &local, size);
        if (rc != EOK) {
                async_answer_0(&call, rc);
                async_answer_0(icall, rc);
                return;
        }

        async_answer_0(icall, rc);
}

static void inet_send_srv(inet_client_t *client, ipc_call_t *icall)
{
        log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_send_srv()");

        inet_dgram_t dgram;

        dgram.iplink = IPC_GET_ARG1(*icall);
        dgram.tos = IPC_GET_ARG2(*icall);

        uint8_t ttl = IPC_GET_ARG3(*icall);
        int df = IPC_GET_ARG4(*icall);

        ipc_call_t call;
        size_t size;
        if (!async_data_write_receive(&call, &size)) {
                async_answer_0(&call, EREFUSED);
                async_answer_0(icall, EREFUSED);
                return;
        }

        if (size != sizeof(inet_addr_t)) {
                async_answer_0(&call, EINVAL);
                async_answer_0(icall, EINVAL);
                return;
        }

        errno_t rc = async_data_write_finalize(&call, &dgram.src, size);
        if (rc != EOK) {
                async_answer_0(&call, rc);
                async_answer_0(icall, rc);
        }

        if (!async_data_write_receive(&call, &size)) {
                async_answer_0(&call, EREFUSED);
                async_answer_0(icall, EREFUSED);
                return;
        }

        if (size != sizeof(inet_addr_t)) {
                async_answer_0(&call, EINVAL);
                async_answer_0(icall, EINVAL);
                return;
        }

        rc = async_data_write_finalize(&call, &dgram.dest, size);
        if (rc != EOK) {
                async_answer_0(&call, rc);
                async_answer_0(icall, rc);
        }

        rc = async_data_write_accept(&dgram.data, false, 0, 0, 0,
            &dgram.size);
        if (rc != EOK) {
                async_answer_0(icall, rc);
                return;
        }

        rc = inet_send(client, &dgram, client->protocol, ttl, df);

        free(dgram.data);
        async_answer_0(icall, rc);
}

static void inet_set_proto_srv(inet_client_t *client, ipc_call_t *call)
{
        sysarg_t proto;

        proto = IPC_GET_ARG1(*call);
        log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_set_proto_srv(%lu)", (unsigned long) proto);

        if (proto > UINT8_MAX) {
                async_answer_0(call, EINVAL);
                return;
        }

        client->protocol = proto;
        async_answer_0(call, EOK);
}

static void inet_client_init(inet_client_t *client)
{
        client->sess = NULL;

        fibril_mutex_lock(&client_list_lock);
        list_append(&client->client_list, &client_list);
        fibril_mutex_unlock(&client_list_lock);
}

static void inet_client_fini(inet_client_t *client)
{
        async_hangup(client->sess);
        client->sess = NULL;

        fibril_mutex_lock(&client_list_lock);
        list_remove(&client->client_list);
        fibril_mutex_unlock(&client_list_lock);
}

static void inet_default_conn(ipc_call_t *icall, void *arg)
{
        inet_client_t client;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_default_conn()");

        /* Accept the connection */
        async_answer_5(icall, EOK, 0, 0, 0, 0, async_get_label());

        inet_client_init(&client);

        while (true) {
                ipc_call_t call;
                async_get_call(&call);
                sysarg_t method = IPC_GET_IMETHOD(call);

                if (!method) {
                        /* The other side has hung up */
                        async_answer_0(&call, EOK);
                        return;
                }

                switch (method) {
                case INET_CALLBACK_CREATE:
                        inet_callback_create_srv(&client, &call);
                        break;
                case INET_GET_SRCADDR:
                        inet_get_srcaddr_srv(&client, &call);
                        break;
                case INET_SEND:
                        inet_send_srv(&client, &call);
                        break;
                case INET_SET_PROTO:
                        inet_set_proto_srv(&client, &call);
                        break;
                default:
                        async_answer_0(&call, EINVAL);
                }
        }

        inet_client_fini(&client);
}

static inet_client_t *inet_client_find(uint8_t proto)
{
        fibril_mutex_lock(&client_list_lock);

        list_foreach(client_list, client_list, inet_client_t, client) {
                if (client->protocol == proto) {
                        fibril_mutex_unlock(&client_list_lock);
                        return client;
                }
        }

        fibril_mutex_unlock(&client_list_lock);
        return NULL;
}

errno_t inet_ev_recv(inet_client_t *client, inet_dgram_t *dgram)
{
        async_exch_t *exch = async_exchange_begin(client->sess);

        ipc_call_t answer;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_ev_recv: iplink=%zu",
            dgram->iplink);

        aid_t req = async_send_2(exch, INET_EV_RECV, dgram->tos,
            dgram->iplink, &answer);

        errno_t 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;
        }

        errno_t retval;
        async_wait_for(req, &retval);

        return retval;
}

errno_t inet_recv_dgram_local(inet_dgram_t *dgram, uint8_t proto)
{
        inet_client_t *client;

        log_msg(LOG_DEFAULT, LVL_DEBUG, "inet_recv_dgram_local()");

        /* ICMP and ICMPv6 messages are handled internally */
        if (proto == IP_PROTO_ICMP)
                return icmp_recv(dgram);

        if (proto == IP_PROTO_ICMPV6)
                return icmpv6_recv(dgram);

        client = inet_client_find(proto);
        if (client == NULL) {
                log_msg(LOG_DEFAULT, LVL_DEBUG, "No client found for protocol 0x%" PRIx8,
                    proto);
                return ENOENT;
        }

        return inet_ev_recv(client, dgram);
}

errno_t inet_recv_packet(inet_packet_t *packet)
{
        inet_addrobj_t *addr;
        inet_dgram_t dgram;

        addr = inet_addrobj_find(&packet->dest, iaf_addr);
        if ((addr != NULL) ||
            (inet_naddr_compare_mask(&solicited_node_mask, &packet->dest)) ||
            (inet_addr_compare(&multicast_all_nodes, &packet->dest)) ||
            (inet_addr_compare(&broadcast4_all_hosts, &packet->dest))) {
                /* Destined for one of the local addresses */

                /* Check if packet is a complete datagram */
                if (packet->offs == 0 && !packet->mf) {
                        /* It is complete deliver it immediately */
                        dgram.iplink = packet->link_id;
                        dgram.src = packet->src;
                        dgram.dest = packet->dest;
                        dgram.tos = packet->tos;
                        dgram.data = packet->data;
                        dgram.size = packet->size;

                        return inet_recv_dgram_local(&dgram, packet->proto);
                } else {
                        /* It is a fragment, queue it for reassembly */
                        inet_reass_queue_packet(packet);
                }
        }

        return ENOENT;
}

int main(int argc, char *argv[])
{
        errno_t rc;

        printf(NAME ": HelenOS Internet Protocol service\n");

        if (log_init(NAME) != EOK) {
                printf(NAME ": Failed to initialize logging.\n");
                return 1;
        }

        rc = inet_init();
        if (rc != EOK)
                return 1;

        printf(NAME ": Accepting connections.\n");
        task_retval(0);
        async_manager();

        /* Not reached */
        return 0;
}

/** @}
 */