/* * Copyright (c) 2009 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 * Packet client interface implementation for remote modules. * @see packet_client.h */ #include #include #include #include #include #include #include #include /** Obtain the packet from the packet server as the shared memory block. * * Create the local packet mapping as well. * * @param[in] sess Packet server module session. * @param[out] packet Packet reference pointer to store the received * packet reference. * @param[in] packet_id Packet identifier. * @param[in] size Packet total size in bytes. * * @return EOK on success. * @return Other error codes as defined for the pm_add() function. * @return Other error codes as defined for the async_share_in_start() * function. * */ static int packet_return(async_sess_t *sess, packet_t **packet, packet_id_t packet_id, size_t size) { async_exch_t *exch = async_exchange_begin(sess); ipc_call_t answer; aid_t message = async_send_1(exch, NET_PACKET_GET, packet_id, &answer); int rc = async_share_in_start_0_0(exch, size, (void *) packet); async_exchange_end(exch); sysarg_t result; async_wait_for(message, &result); if (rc != EOK) return rc; if (packet == (void *) -1) return ENOMEM; rc = pm_add(*packet); if (rc != EOK) { munmap(*packet, size); return rc; } return result; } /** Translate the packet identifier to the packet reference. * * Try to find mapping first. The packet server is asked to share * the packet if the mapping is not present. * * @param[in] sess Packet server module session. * @param[out] packet Packet reference. * @param[in] packet_id Packet identifier. * * @return EOK on success. * @return EINVAL if the packet parameter is NULL. * @return Other error codes as defined for the NET_PACKET_GET_SIZE * message. * @return Other error codes as defined for the packet_return() * function. * */ int packet_translate_remote(async_sess_t *sess, packet_t **packet, packet_id_t packet_id) { if (!packet) return EINVAL; *packet = pm_find(packet_id); if (*packet == NULL) { async_exch_t *exch = async_exchange_begin(sess); sysarg_t size; int rc = async_req_1_1(exch, NET_PACKET_GET_SIZE, packet_id, &size); async_exchange_end(exch); if (rc != EOK) return rc; rc = packet_return(sess, packet, packet_id, size); if (rc != EOK) return rc; } if ((*packet != NULL) && ((*packet)->next)) { packet_t *next; return packet_translate_remote(sess, &next, (*packet)->next); } return EOK; } /** Obtain the packet of given dimensions. * * Contact the packet server to return the appropriate packet. * * @param[in] sess Packet server module session. * @param[in] addr_len Source and destination addresses maximal length * in bytes. * @param[in] max_prefix Maximal prefix length in bytes. * @param[in] max_content Maximal content length in bytes. * @param[in] max_suffix Maximal suffix length in bytes. * * @return The packet reference. * @return NULL on error. * */ packet_t *packet_get_4_remote(async_sess_t *sess, size_t max_content, size_t addr_len, size_t max_prefix, size_t max_suffix) { async_exch_t *exch = async_exchange_begin(sess); sysarg_t packet_id; sysarg_t size; int rc = async_req_4_2(exch, NET_PACKET_CREATE_4, max_content, addr_len, max_prefix, max_suffix, &packet_id, &size); async_exchange_end(exch); if (rc != EOK) return NULL; packet_t *packet = pm_find(packet_id); if (!packet) { rc = packet_return(sess, &packet, packet_id, size); if (rc != EOK) return NULL; } return packet; } /** Obtain the packet of given content size. * * Contact the packet server to return the appropriate packet. * * @param[in] sess Packet server module session. * @param[in] content Maximal content length in bytes. * * @return The packet reference. * @return NULL on error. * */ packet_t *packet_get_1_remote(async_sess_t *sess, size_t content) { async_exch_t *exch = async_exchange_begin(sess); sysarg_t packet_id; sysarg_t size; int rc = async_req_1_2(exch, NET_PACKET_CREATE_1, content, &packet_id, &size); async_exchange_end(exch); if (rc != EOK) return NULL; packet_t *packet = pm_find(packet_id); if (!packet) { rc = packet_return(sess, &packet, packet_id, size); if (rc != EOK) return NULL; } return packet; } /** Release the packet queue. * * All packets in the queue are marked as free for use. * The packet queue may be one packet only. * The module should not use the packets after this point until they are * received or obtained again. * * @param[in] sess Packet server module session. * @param[in] packet_id Packet identifier. * */ void pq_release_remote(async_sess_t *sess, packet_id_t packet_id) { async_exch_t *exch = async_exchange_begin(sess); async_msg_1(exch, NET_PACKET_RELEASE, packet_id); async_exchange_end(exch); } /** @} */