1 /* $NetBSD: if_npflog.c,v 1.3 2013/03/13 13:15:47 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2010-2012 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This material is based upon work partially supported by The 8 * NetBSD Foundation under a contract with Mindaugas Rasiukevicius. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * 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 IN 27 * 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 THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * NPF logging extension. 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: if_npflog.c,v 1.3 2013/03/13 13:15:47 christos Exp $"); 38 39 #include <sys/types.h> 40 #include <sys/module.h> 41 42 #include <sys/conf.h> 43 #include <sys/kmem.h> 44 #include <sys/mbuf.h> 45 #include <sys/mutex.h> 46 #include <sys/queue.h> 47 #include <sys/sockio.h> 48 49 #include <net/if.h> 50 #include <net/if_types.h> 51 #include <net/bpf.h> 52 53 MODULE(MODULE_CLASS_DRIVER, if_npflog, NULL); 54 55 typedef struct npflog_softc { 56 LIST_ENTRY(npflog_softc) sc_entry; 57 kmutex_t sc_lock; 58 ifnet_t sc_if; 59 int sc_unit; 60 } npflog_softc_t; 61 62 static int npflog_clone_create(struct if_clone *, int); 63 static int npflog_clone_destroy(ifnet_t *); 64 65 static LIST_HEAD(, npflog_softc) npflog_if_list __cacheline_aligned; 66 static struct if_clone npflog_cloner = 67 IF_CLONE_INITIALIZER("npflog", npflog_clone_create, npflog_clone_destroy); 68 69 static void 70 npflogattach(int nunits) 71 { 72 73 LIST_INIT(&npflog_if_list); 74 if_clone_attach(&npflog_cloner); 75 } 76 77 static void 78 npflogdetach(void) 79 { 80 npflog_softc_t *sc; 81 82 while ((sc = LIST_FIRST(&npflog_if_list)) != NULL) { 83 npflog_clone_destroy(&sc->sc_if); 84 } 85 if_clone_detach(&npflog_cloner); 86 } 87 88 static int 89 npflog_ioctl(ifnet_t *ifp, u_long cmd, void *data) 90 { 91 npflog_softc_t *sc = ifp->if_softc; 92 int error = 0; 93 94 mutex_enter(&sc->sc_lock); 95 switch (cmd) { 96 case SIOCINITIFADDR: 97 ifp->if_flags |= (IFF_UP | IFF_RUNNING); 98 break; 99 default: 100 error = ifioctl_common(ifp, cmd, data); 101 break; 102 } 103 mutex_exit(&sc->sc_lock); 104 return error; 105 } 106 107 static int 108 npflog_clone_create(struct if_clone *ifc, int unit) 109 { 110 npflog_softc_t *sc; 111 ifnet_t *ifp; 112 113 sc = kmem_zalloc(sizeof(npflog_softc_t), KM_SLEEP); 114 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_SOFTNET); 115 116 ifp = &sc->sc_if; 117 ifp->if_softc = sc; 118 119 if_initname(ifp, "npflog", unit); 120 ifp->if_type = IFT_OTHER; 121 ifp->if_dlt = DLT_NULL; 122 ifp->if_ioctl = npflog_ioctl; 123 124 KERNEL_LOCK(1, NULL); 125 if_attach(ifp); 126 if_alloc_sadl(ifp); 127 bpf_attach(ifp, DLT_NULL, 0); 128 LIST_INSERT_HEAD(&npflog_if_list, sc, sc_entry); 129 KERNEL_UNLOCK_ONE(NULL); 130 131 return 0; 132 } 133 134 static int 135 npflog_clone_destroy(ifnet_t *ifp) 136 { 137 npflog_softc_t *sc = ifp->if_softc; 138 139 KERNEL_LOCK(1, NULL); 140 LIST_REMOVE(sc, sc_entry); 141 bpf_detach(ifp); 142 if_detach(ifp); 143 KERNEL_UNLOCK_ONE(NULL); 144 145 mutex_destroy(&sc->sc_lock); 146 kmem_free(sc, sizeof(npflog_softc_t)); 147 return 0; 148 } 149 150 /* 151 * Module interface. 152 */ 153 static int 154 if_npflog_modcmd(modcmd_t cmd, void *arg) 155 { 156 switch (cmd) { 157 case MODULE_CMD_INIT: 158 npflogattach(1); 159 break; 160 161 case MODULE_CMD_FINI: 162 npflogdetach(); 163 break; 164 165 case MODULE_CMD_AUTOUNLOAD: 166 return EBUSY; 167 168 default: 169 return ENOTTY; 170 } 171 return 0; 172 } 173