1 /* $NetBSD: if_npflog.c,v 1.5 2017/01/29 00:15:54 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 #ifdef _KERNEL 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: if_npflog.c,v 1.5 2017/01/29 00:15:54 christos Exp $"); 39 40 #include <sys/types.h> 41 #include <sys/module.h> 42 43 #include <sys/conf.h> 44 #include <sys/kmem.h> 45 #include <sys/mbuf.h> 46 #include <sys/mutex.h> 47 #include <sys/queue.h> 48 #include <sys/sockio.h> 49 50 #include <net/if.h> 51 #include <net/if_types.h> 52 #include <net/bpf.h> 53 #endif 54 55 #include "npf_impl.h" 56 #include "if_npflog.h" 57 58 MODULE(MODULE_CLASS_DRIVER, if_npflog, NULL); 59 60 typedef struct npflog_softc { 61 LIST_ENTRY(npflog_softc) sc_entry; 62 kmutex_t sc_lock; 63 ifnet_t sc_if; 64 int sc_unit; 65 } npflog_softc_t; 66 67 static int npflog_clone_create(struct if_clone *, int); 68 static int npflog_clone_destroy(ifnet_t *); 69 70 static LIST_HEAD(, npflog_softc) npflog_if_list __cacheline_aligned; 71 static struct if_clone npflog_cloner = 72 IF_CLONE_INITIALIZER("npflog", npflog_clone_create, npflog_clone_destroy); 73 74 static void 75 npflogattach(int nunits) 76 { 77 78 LIST_INIT(&npflog_if_list); 79 if_clone_attach(&npflog_cloner); 80 } 81 82 static void 83 npflogdetach(void) 84 { 85 npflog_softc_t *sc; 86 87 while ((sc = LIST_FIRST(&npflog_if_list)) != NULL) { 88 npflog_clone_destroy(&sc->sc_if); 89 } 90 if_clone_detach(&npflog_cloner); 91 } 92 93 static int 94 npflog_ioctl(ifnet_t *ifp, u_long cmd, void *data) 95 { 96 npflog_softc_t *sc = ifp->if_softc; 97 int error = 0; 98 99 mutex_enter(&sc->sc_lock); 100 switch (cmd) { 101 case SIOCINITIFADDR: 102 ifp->if_flags |= (IFF_UP | IFF_RUNNING); 103 break; 104 default: 105 error = ifioctl_common(ifp, cmd, data); 106 break; 107 } 108 mutex_exit(&sc->sc_lock); 109 return error; 110 } 111 112 static int 113 npflog_clone_create(struct if_clone *ifc, int unit) 114 { 115 npflog_softc_t *sc; 116 ifnet_t *ifp; 117 118 sc = kmem_zalloc(sizeof(npflog_softc_t), KM_SLEEP); 119 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_SOFTNET); 120 121 ifp = &sc->sc_if; 122 ifp->if_softc = sc; 123 124 if_initname(ifp, "npflog", unit); 125 ifp->if_type = IFT_OTHER; 126 ifp->if_dlt = DLT_NULL; 127 ifp->if_ioctl = npflog_ioctl; 128 129 KERNEL_LOCK(1, NULL); 130 if_attach(ifp); 131 if_alloc_sadl(ifp); 132 bpf_attach(ifp, DLT_NPFLOG, NPFLOG_HDRLEN); 133 LIST_INSERT_HEAD(&npflog_if_list, sc, sc_entry); 134 KERNEL_UNLOCK_ONE(NULL); 135 136 return 0; 137 } 138 139 static int 140 npflog_clone_destroy(ifnet_t *ifp) 141 { 142 npflog_softc_t *sc = ifp->if_softc; 143 144 KERNEL_LOCK(1, NULL); 145 LIST_REMOVE(sc, sc_entry); 146 bpf_detach(ifp); 147 if_detach(ifp); 148 KERNEL_UNLOCK_ONE(NULL); 149 150 mutex_destroy(&sc->sc_lock); 151 kmem_free(sc, sizeof(npflog_softc_t)); 152 return 0; 153 } 154 155 /* 156 * Module interface. 157 */ 158 static int 159 if_npflog_modcmd(modcmd_t cmd, void *arg) 160 { 161 switch (cmd) { 162 case MODULE_CMD_INIT: 163 npflogattach(1); 164 break; 165 166 case MODULE_CMD_FINI: 167 npflogdetach(); 168 break; 169 170 case MODULE_CMD_AUTOUNLOAD: 171 return EBUSY; 172 173 default: 174 return ENOTTY; 175 } 176 return 0; 177 } 178