1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2010-2011 Monthadar Al Jaberi, TerraNet AB 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer, 12 * without modification. 13 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 14 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 15 * redistribution must be conditioned upon including a substantially 16 * similar Disclaimer requirement for further binary redistribution. 17 * 18 * NO WARRANTY 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 22 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 23 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 24 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 27 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 29 * THE POSSIBILITY OF SUCH DAMAGES. 30 * 31 * $FreeBSD$ 32 */ 33 #include "if_wtapvar.h" 34 #include "if_medium.h" 35 36 void 37 init_medium(struct wtap_medium *md) 38 { 39 40 DWTAP_PRINTF("%s\n", __func__); 41 STAILQ_INIT(&md->md_pktbuf); 42 mtx_init(&md->md_mtx, "wtap_medium mtx", NULL, MTX_DEF | MTX_RECURSE); 43 44 /* Event handler for sending packets between wtaps */ 45 struct eventhandler *eh = (struct eventhandler *) 46 malloc(sizeof(struct eventhandler), M_WTAP, M_NOWAIT | M_ZERO); 47 eh->tq = taskqueue_create("wtap_tx_taskq", M_NOWAIT | M_ZERO, 48 taskqueue_thread_enqueue, &eh->tq); 49 taskqueue_start_threads(&eh->tq, 1, PI_NET, "%s taskq", "wtap_medium"); 50 md->tx_handler = eh; 51 /* Mark medium closed by default */ 52 md->open = 0; 53 } 54 55 void 56 deinit_medium(struct wtap_medium *md) 57 { 58 59 DWTAP_PRINTF("%s\n", __func__); 60 taskqueue_free(md->tx_handler->tq); 61 free(md->tx_handler, M_WTAP); 62 } 63 64 int 65 medium_transmit(struct wtap_medium *md, int id, struct mbuf*m) 66 { 67 68 mtx_lock(&md->md_mtx); 69 if (md->open == 0){ 70 DWTAP_PRINTF("[%d] dropping m=%p\n", id, m); 71 m_free(m); 72 mtx_unlock(&md->md_mtx); 73 return 0; 74 } 75 76 DWTAP_PRINTF("[%d] transmiting m=%p\n", id, m); 77 struct packet *p = (struct packet *)malloc(sizeof(struct packet), 78 M_WTAP_PACKET, M_ZERO | M_NOWAIT); 79 p->id = id; 80 p->m = m; 81 82 STAILQ_INSERT_TAIL(&md->md_pktbuf, p, pf_list); 83 taskqueue_enqueue(md->tx_handler->tq, &md->tx_handler->proc); 84 mtx_unlock(&md->md_mtx); 85 86 return 0; 87 } 88 89 struct packet * 90 medium_get_next_packet(struct wtap_medium *md) 91 { 92 struct packet *p; 93 94 mtx_lock(&md->md_mtx); 95 p = STAILQ_FIRST(&md->md_pktbuf); 96 if (p == NULL){ 97 mtx_unlock(&md->md_mtx); 98 return NULL; 99 } 100 101 STAILQ_REMOVE_HEAD(&md->md_pktbuf, pf_list); 102 mtx_unlock(&md->md_mtx); 103 return p; 104 } 105 106 void 107 medium_open(struct wtap_medium *md) 108 { 109 110 mtx_lock(&md->md_mtx); 111 md->open = 1; 112 mtx_unlock(&md->md_mtx); 113 } 114 115 void 116 medium_close(struct wtap_medium *md) 117 { 118 119 mtx_lock(&md->md_mtx); 120 md->open = 0; 121 mtx_unlock(&md->md_mtx); 122 } 123