[8218b6b] | 1 | /*
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| 2 | * Copyright (c) 2011 Jiri Svoboda
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup tcp
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | /**
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| 34 | * @file Network condition simulator
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| 35 | *
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| 36 | * Simulate network conditions for testing the reliability implementation:
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| 37 | * - variable latency
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| 38 | * - frame drop
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| 39 | */
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| 40 |
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| 41 | #include <adt/list.h>
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| 42 | #include <async.h>
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| 43 | #include <errno.h>
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| 44 | #include <io/log.h>
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| 45 | #include <stdlib.h>
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[88a6819] | 46 | #include <fibril.h>
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[8218b6b] | 47 | #include "conn.h"
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| 48 | #include "ncsim.h"
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| 49 | #include "rqueue.h"
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[7cf7ded] | 50 | #include "segment.h"
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[8218b6b] | 51 | #include "tcp_type.h"
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| 52 |
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| 53 | static list_t sim_queue;
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| 54 | static fibril_mutex_t sim_queue_lock;
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| 55 | static fibril_condvar_t sim_queue_cv;
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| 56 |
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| 57 | /** Initialize segment receive queue. */
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| 58 | void tcp_ncsim_init(void)
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| 59 | {
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| 60 | list_initialize(&sim_queue);
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| 61 | fibril_mutex_initialize(&sim_queue_lock);
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| 62 | fibril_condvar_initialize(&sim_queue_cv);
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| 63 | }
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| 64 |
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| 65 | /** Bounce segment through simulator into receive queue.
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| 66 | *
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| 67 | * @param sp Socket pair, oriented for transmission
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| 68 | * @param seg Segment
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| 69 | */
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| 70 | void tcp_ncsim_bounce_seg(tcp_sockpair_t *sp, tcp_segment_t *seg)
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| 71 | {
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| 72 | tcp_squeue_entry_t *sqe;
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| 73 | tcp_squeue_entry_t *old_qe;
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| 74 | link_t *link;
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| 75 |
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[7cf7ded] | 76 | log_msg(LVL_DEBUG, "tcp_ncsim_bounce_seg()");
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| 77 | tcp_rqueue_bounce_seg(sp, seg);
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| 78 | return;
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| 79 |
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| 80 | if (0 /*random() % 4 == 3*/) {
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| 81 | /* Drop segment */
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| 82 | log_msg(LVL_ERROR, "NCSim dropping segment");
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| 83 | tcp_segment_delete(seg);
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| 84 | return;
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| 85 | }
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[8218b6b] | 86 |
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| 87 | sqe = calloc(1, sizeof(tcp_squeue_entry_t));
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| 88 | if (sqe == NULL) {
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| 89 | log_msg(LVL_ERROR, "Failed allocating SQE.");
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| 90 | return;
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| 91 | }
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| 92 |
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| 93 | sqe->delay = random() % (1000 * 1000);
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| 94 | sqe->sp = *sp;
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| 95 | sqe->seg = seg;
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| 96 |
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| 97 | fibril_mutex_lock(&sim_queue_lock);
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| 98 |
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| 99 | link = list_first(&sim_queue);
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| 100 | while (link != NULL && sqe->delay > 0) {
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| 101 | old_qe = list_get_instance(link, tcp_squeue_entry_t, link);
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| 102 | if (sqe->delay < old_qe->delay)
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| 103 | break;
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| 104 |
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| 105 | sqe->delay -= old_qe->delay;
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| 106 |
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| 107 | link = link->next;
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| 108 | if (link == &sim_queue.head)
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| 109 | link = NULL;
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| 110 | }
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| 111 |
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| 112 | if (link != NULL)
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| 113 | list_insert_after(&sqe->link, link);
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| 114 | else
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| 115 | list_append(&sqe->link, &sim_queue);
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| 116 |
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| 117 | fibril_condvar_broadcast(&sim_queue_cv);
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| 118 | fibril_mutex_unlock(&sim_queue_lock);
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| 119 | }
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| 120 |
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[88a6819] | 121 | /** Network condition simulator handler fibril. */
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| 122 | static int tcp_ncsim_fibril(void *arg)
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[8218b6b] | 123 | {
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| 124 | link_t *link;
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| 125 | tcp_squeue_entry_t *sqe;
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| 126 | int rc;
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| 127 |
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[88a6819] | 128 | log_msg(LVL_DEBUG, "tcp_ncsim_fibril()");
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[8218b6b] | 129 |
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| 130 |
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| 131 | while (true) {
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| 132 | fibril_mutex_lock(&sim_queue_lock);
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| 133 |
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| 134 | while (list_empty(&sim_queue))
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| 135 | fibril_condvar_wait(&sim_queue_cv, &sim_queue_lock);
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| 136 |
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| 137 | do {
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| 138 | link = list_first(&sim_queue);
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| 139 | sqe = list_get_instance(link, tcp_squeue_entry_t, link);
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| 140 |
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| 141 | log_msg(LVL_DEBUG, "NCSim - Sleep");
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| 142 | rc = fibril_condvar_wait_timeout(&sim_queue_cv,
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| 143 | &sim_queue_lock, sqe->delay);
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| 144 | } while (rc != ETIMEOUT);
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| 145 |
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| 146 | list_remove(link);
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| 147 | fibril_mutex_unlock(&sim_queue_lock);
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| 148 |
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| 149 | log_msg(LVL_DEBUG, "NCSim - End Sleep");
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| 150 | tcp_rqueue_bounce_seg(&sqe->sp, sqe->seg);
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| 151 | free(sqe);
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| 152 | }
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[88a6819] | 153 |
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| 154 | /* Not reached */
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| 155 | return 0;
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[8218b6b] | 156 | }
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| 157 |
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[88a6819] | 158 | /** Start simulator handler fibril. */
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| 159 | void tcp_ncsim_fibril_start(void)
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[8218b6b] | 160 | {
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[88a6819] | 161 | fid_t fid;
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[8218b6b] | 162 |
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[88a6819] | 163 | log_msg(LVL_DEBUG, "tcp_ncsim_fibril_start()");
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[8218b6b] | 164 |
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[88a6819] | 165 | fid = fibril_create(tcp_ncsim_fibril, NULL);
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| 166 | if (fid == 0) {
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| 167 | log_msg(LVL_ERROR, "Failed creating ncsim fibril.");
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[8218b6b] | 168 | return;
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| 169 | }
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[88a6819] | 170 |
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| 171 | fibril_add_ready(fid);
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[8218b6b] | 172 | }
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| 173 |
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| 174 | /**
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| 175 | * @}
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| 176 | */
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