source: mainline/uspace/lib/net/tl/tl_common.c@ e2c50e1

/*
 * Copyright (c) 2008 Lukas Mejdrech
 * 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 libnet
 * @{
 */

/** @file
 * Transport layer common functions implementation.
 * @see tl_common.h
 */

#include <tl_common.h>
#include <packet_client.h>
#include <packet_remote.h>
#include <icmp_remote.h>
#include <ip_remote.h>
#include <ip_interface.h>
#include <tl_remote.h>
#include <net/socket_codes.h>
#include <net/in.h>
#include <net/in6.h>
#include <net/inet.h>
#include <net/device.h>
#include <net/packet.h>
#include <async.h>
#include <ipc/services.h>
#include <errno.h>

DEVICE_MAP_IMPLEMENT(packet_dimensions, packet_dimension_t);

/** Gets the address port.
 *
 * Supports AF_INET and AF_INET6 address families.
 *
 * @param[in,out] addr  The address to be updated.
 * @param[in] addrlen   The address length.
 * @param[out] port     The set port.
 * @return              EOK on success.
 * @return              EINVAL if the address length does not match the address
 *                      family.
 * @return              EAFNOSUPPORT if the address family is not supported.
 */
int
tl_get_address_port(const struct sockaddr *addr, int addrlen, uint16_t *port)
{
        const struct sockaddr_in *address_in;
        const struct sockaddr_in6 *address_in6;

        if ((addrlen <= 0) || ((size_t) addrlen < sizeof(struct sockaddr)))
                return EINVAL;

        switch (addr->sa_family) {
        case AF_INET:
                if (addrlen != sizeof(struct sockaddr_in))
                        return EINVAL;

                address_in = (struct sockaddr_in *) addr;
                *port = ntohs(address_in->sin_port);
                break;
        
        case AF_INET6:
                if (addrlen != sizeof(struct sockaddr_in6))
                        return EINVAL;

                address_in6 = (struct sockaddr_in6 *) addr;
                *port = ntohs(address_in6->sin6_port);
                break;
        
        default:
                return EAFNOSUPPORT;
        }

        return EOK;
}

/** Get IP packet dimensions.
 *
 * Try to search a cache and query the IP module if not found.
 * The reply is cached then.
 *
 * @param[in]  sess              IP module session.
 * @param[in]  packet_dimensions Packet dimensions cache.
 * @param[in]  device_id         Device identifier.
 * @param[out] packet_dimension  IP packet dimensions.
 *
 * @return EOK on success.
 * @return EBADMEM if the packet_dimension parameter is NULL.
 * @return ENOMEM if there is not enough memory left.
 * @return EINVAL if the packet_dimensions cache is not valid.
 * @return Other codes as defined for the ip_packet_size_req()
 *         function.
 *
 */
int tl_get_ip_packet_dimension(async_sess_t *sess,
    packet_dimensions_t *packet_dimensions, nic_device_id_t device_id,
    packet_dimension_t **packet_dimension)
{
        if (!packet_dimension)
                return EBADMEM;
        
        *packet_dimension = packet_dimensions_find(packet_dimensions,
            device_id);
        if (!*packet_dimension) {
                /* Ask for and remember them if not found */
                *packet_dimension = malloc(sizeof(**packet_dimension));
                if (!*packet_dimension)
                        return ENOMEM;
                
                int rc = ip_packet_size_req(sess, device_id, *packet_dimension);
                if (rc != EOK) {
                        free(*packet_dimension);
                        return rc;
                }
                
                rc = packet_dimensions_add(packet_dimensions, device_id,
                    *packet_dimension);
                if (rc < 0) {
                        free(*packet_dimension);
                        return rc;
                }
        }
        
        return EOK;
}

/** Updates IP device packet dimensions cache.
 *
 * @param[in,out] packet_dimensions The packet dimensions cache.
 * @param[in] device_id The device identifier.
 * @param[in] content   The new maximum content size.
 * @return              EOK on success.
 * @return              ENOENT if the packet dimension is not cached.
 */
int
tl_update_ip_packet_dimension(packet_dimensions_t *packet_dimensions,
    nic_device_id_t device_id, size_t content)
{
        packet_dimension_t *packet_dimension;

        packet_dimension = packet_dimensions_find(packet_dimensions, device_id);
        if (!packet_dimension)
                return ENOENT;

        packet_dimension->content = content;

        if (device_id != NIC_DEVICE_INVALID_ID) {
                packet_dimension = packet_dimensions_find(packet_dimensions,
                    NIC_DEVICE_INVALID_ID);

                if (packet_dimension) {
                        if (packet_dimension->content >= content)
                                packet_dimension->content = content;
                        else
                                packet_dimensions_exclude(packet_dimensions,
                                    NIC_DEVICE_INVALID_ID, free);
                }
        }

        return EOK;
}

/** Sets the address port.
 *
 * Supports AF_INET and AF_INET6 address families.
 *
 * @param[in,out] addr  The address to be updated.
 * @param[in] addrlen   The address length.
 * @param[in] port      The port to be set.
 * @return              EOK on success.
 * @return              EINVAL if the address length does not match the address
 *                      family.
 * @return              EAFNOSUPPORT if the address family is not supported.
 */
int tl_set_address_port(struct sockaddr * addr, int addrlen, uint16_t port)
{
        struct sockaddr_in *address_in;
        struct sockaddr_in6 *address_in6;
        size_t length;

        if (addrlen < 0)
                return EINVAL;
        
        length = (size_t) addrlen;
        if (length < sizeof(struct sockaddr))
                return EINVAL;

        switch (addr->sa_family) {
        case AF_INET:
                if (length != sizeof(struct sockaddr_in))
                        return EINVAL;
                address_in = (struct sockaddr_in *) addr;
                address_in->sin_port = htons(port);
                return EOK;
        
        case AF_INET6:
                if (length != sizeof(struct sockaddr_in6))
                                return EINVAL;
                address_in6 = (struct sockaddr_in6 *) addr;
                address_in6->sin6_port = htons(port);
                return EOK;
        
        default:
                return EAFNOSUPPORT;
        }
}

/** Prepares the packet for ICMP error notification.
 *
 * Keep the first packet and release all the others.
 * Release all the packets on error.
 *
 * @param[in] packet_sess Packet server module session.
 * @param[in] icmp_sess   ICMP module phone.
 * @param[in] packet      Packet to be send.
 * @param[in] error       Packet error reporting service. Prefixes the
 *                        received packet.
 *
 * @return EOK on success.
 * @return ENOENT if no packet may be sent.
 *
 */
int tl_prepare_icmp_packet(async_sess_t *packet_sess, async_sess_t *icmp_sess,
    packet_t *packet, services_t error)
{
        /* Detach the first packet and release the others */
        packet_t *next = pq_detach(packet);
        if (next)
                pq_release_remote(packet_sess, packet_get_id(next));
        
        uint8_t *src;
        int length = packet_get_addr(packet, &src, NULL);
        if ((length > 0) && (!error) && (icmp_sess) &&
            /*
             * Set both addresses to the source one (avoids the source address
             * deletion before setting the destination one)
             */
            (packet_set_addr(packet, src, src, (size_t) length) == EOK)) {
                return EOK;
        } else
                pq_release_remote(packet_sess, packet_get_id(packet));
        
        return ENOENT;
}

/** Receives data from the socket into a packet.
 *
 * @param[in]  sess      Packet server module session.
 * @param[out] packet    New created packet.
 * @param[in]  prefix    Reserved packet data prefix length.
 * @param[in]  dimension Packet dimension.
 * @param[in]  addr      Destination address.
 * @param[in]  addrlen   Address length.
 *
 * @return Number of bytes received.
 * @return EINVAL if the client does not send data.
 * @return ENOMEM if there is not enough memory left.
 * @return Other error codes as defined for the
 *         async_data_read_finalize() function.
 *
 */
int tl_socket_read_packet_data(async_sess_t *sess, packet_t **packet,
    size_t prefix, const packet_dimension_t *dimension,
    const struct sockaddr *addr, socklen_t addrlen)
{
        ipc_callid_t callid;
        size_t length;
        void *data;
        int rc;

        if (!dimension)
                return EINVAL;

        /* Get the data length */
        if (!async_data_write_receive(&callid, &length))
                return EINVAL;

        /* Get a new packet */
        *packet = packet_get_4_remote(sess, length, dimension->addr_len,
            prefix + dimension->prefix, dimension->suffix);
        if (!packet)
                return ENOMEM;

        /* Allocate space in the packet */
        data = packet_suffix(*packet, length);
        if (!data) {
                pq_release_remote(sess, packet_get_id(*packet));
                return ENOMEM;
        }

        /* Read the data into the packet */
        rc = async_data_write_finalize(callid, data, length);
        if (rc != EOK) {
                pq_release_remote(sess, packet_get_id(*packet));
                return rc;
        }
        
        /* Set the packet destination address */
        rc = packet_set_addr(*packet, NULL, (uint8_t *) addr, addrlen);
        if (rc != EOK) {
                pq_release_remote(sess, packet_get_id(*packet));
                return rc;
        }

        return (int) length;
}

/** @}
 */