1 /*- 2 * Copyright (c) 2014-2018, Matthew Macy <[email protected]> 3 * Copyright (C) 2017-2018 Joyent Inc. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * 2. Neither the name of Matthew Macy nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_inet.h" 33 #include "opt_inet6.h" 34 #include "opt_acpi.h" 35 #include "opt_sched.h" 36 37 #include <sys/param.h> 38 #include <sys/types.h> 39 #include <sys/bus.h> 40 #include <sys/eventhandler.h> 41 #include <sys/event.h> 42 #include <sys/sockio.h> 43 #include <sys/kernel.h> 44 #include <sys/lock.h> 45 #include <sys/mutex.h> 46 #include <sys/module.h> 47 #include <sys/kobj.h> 48 #include <sys/rman.h> 49 #include <sys/sbuf.h> 50 #include <sys/smp.h> 51 #include <sys/socket.h> 52 #include <sys/sysctl.h> 53 #include <sys/syslog.h> 54 #include <sys/taskqueue.h> 55 #include <sys/limits.h> 56 #include <sys/queue.h> 57 #include <sys/jail.h> 58 #include <sys/md5.h> 59 #include <sys/proc.h> 60 61 #include <net/if.h> 62 #include <net/if_var.h> 63 #include <net/if_types.h> 64 #include <net/if_media.h> 65 #include <net/if_clone.h> 66 #include <net/bpf.h> 67 #include <net/ethernet.h> 68 #include <net/vnet.h> 69 70 #include <net/iflib.h> 71 #include <net/iflib_private.h> 72 #include "ifdi_if.h" 73 74 int 75 noop_attach(device_t dev) 76 { 77 return (0); 78 } 79 80 int 81 iflib_pseudo_detach(device_t dev) 82 { 83 if_ctx_t ctx; 84 85 ctx = device_get_softc(dev); 86 if ((iflib_get_flags(ctx) & IFC_IN_DETACH) == 0) 87 return (EBUSY); 88 return (0); 89 } 90 91 static device_t iflib_pseudodev; 92 93 static struct mtx pseudoif_mtx; 94 MTX_SYSINIT(pseudoif_mtx, &pseudoif_mtx, "pseudoif_mtx", MTX_DEF); 95 96 #define PSEUDO_LOCK() mtx_lock(&pseudoif_mtx); 97 #define PSEUDO_UNLOCK() mtx_unlock(&pseudoif_mtx); 98 99 struct if_pseudo { 100 eventhandler_tag ip_detach_tag; 101 eventhandler_tag ip_lladdr_tag; 102 struct if_clone *ip_ifc; 103 if_shared_ctx_t ip_sctx; 104 devclass_t ip_dc; 105 LIST_ENTRY(if_pseudo) ip_list; 106 int ip_on_list; 107 }; 108 109 static LIST_HEAD(, if_pseudo) iflib_pseudos = LIST_HEAD_INITIALIZER(iflib_pseudos); 110 111 /* 112 * XXX this assumes that the rest of the 113 * code won't hang on to it after it's 114 * removed / unloaded 115 */ 116 static if_pseudo_t 117 iflib_ip_lookup(const char *name) 118 { 119 if_pseudo_t ip = NULL; 120 121 PSEUDO_LOCK(); 122 LIST_FOREACH(ip, &iflib_pseudos, ip_list) { 123 if (!strcmp(ip->ip_sctx->isc_name, name)) 124 break; 125 } 126 PSEUDO_UNLOCK(); 127 return (ip); 128 } 129 130 static void 131 iflib_ip_delete(if_pseudo_t ip) 132 { 133 PSEUDO_LOCK(); 134 if (ip->ip_on_list) { 135 LIST_REMOVE(ip, ip_list); 136 ip->ip_on_list = 0; 137 } 138 PSEUDO_UNLOCK(); 139 } 140 141 static void 142 iflib_ip_insert(if_pseudo_t ip) 143 { 144 PSEUDO_LOCK(); 145 if (!ip->ip_on_list) { 146 LIST_INSERT_HEAD(&iflib_pseudos, ip, ip_list); 147 ip->ip_on_list = 1; 148 } 149 PSEUDO_UNLOCK(); 150 } 151 152 static void 153 iflib_ifdetach(void *arg __unused, if_t ifp) 154 { 155 156 /* If the ifnet is just being renamed, don't do anything. */ 157 if (ifp->if_flags & IFF_RENAMING) 158 return; 159 } 160 161 static void 162 iflib_iflladdr(void *arg __unused, if_t ifp __unused) 163 { 164 165 } 166 167 static int 168 iflib_clone_create(struct if_clone *ifc, int unit, caddr_t params) 169 { 170 const char *name = ifc_name(ifc); 171 struct iflib_cloneattach_ctx clctx; 172 if_ctx_t ctx; 173 if_pseudo_t ip; 174 device_t dev; 175 int rc; 176 177 clctx.cc_ifc = ifc; 178 clctx.cc_len = 0; 179 clctx.cc_params = params; 180 clctx.cc_name = name; 181 182 if (__predict_false(iflib_pseudodev == NULL)) { 183 /* SYSINIT initialization would panic !?! */ 184 mtx_lock(&Giant); 185 iflib_pseudodev = device_add_child(root_bus, "ifpseudo", 0); 186 mtx_unlock(&Giant); 187 MPASS(iflib_pseudodev != NULL); 188 } 189 ip = iflib_ip_lookup(name); 190 if (ip == NULL) { 191 printf("no ip found for %s\n", name); 192 return (ENOENT); 193 } 194 if ((dev = devclass_get_device(ip->ip_dc, unit)) != NULL) { 195 printf("unit %d allocated\n", unit); 196 bus_generic_print_child(iflib_pseudodev, dev); 197 return (EBUSY); 198 } 199 PSEUDO_LOCK(); 200 dev = device_add_child(iflib_pseudodev, name, unit); 201 device_set_driver(dev, &iflib_pseudodriver); 202 PSEUDO_UNLOCK(); 203 device_quiet(dev); 204 rc = device_attach(dev); 205 MPASS(rc == 0); 206 MPASS(dev != NULL); 207 MPASS(devclass_get_device(ip->ip_dc, unit) == dev); 208 rc = iflib_pseudo_register(dev, ip->ip_sctx, &ctx, &clctx); 209 if (rc) { 210 mtx_lock(&Giant); 211 device_delete_child(iflib_pseudodev, dev); 212 mtx_unlock(&Giant); 213 } else 214 device_set_softc(dev, ctx); 215 216 return (rc); 217 } 218 219 static void 220 iflib_clone_destroy(if_t ifp) 221 { 222 if_ctx_t ctx; 223 device_t dev; 224 struct sx *ctx_lock; 225 int rc; 226 227 /* 228 * Detach device / free / free unit 229 */ 230 ctx = if_getsoftc(ifp); 231 dev = iflib_get_dev(ctx); 232 ctx_lock = iflib_ctx_lock_get(ctx); 233 sx_xlock(ctx_lock); 234 iflib_set_detach(ctx); 235 iflib_stop(ctx); 236 sx_xunlock(ctx_lock); 237 238 mtx_lock(&Giant); 239 rc = device_delete_child(iflib_pseudodev, dev); 240 mtx_unlock(&Giant); 241 if (rc == 0) 242 iflib_pseudo_deregister(ctx); 243 } 244 245 if_pseudo_t 246 iflib_clone_register(if_shared_ctx_t sctx) 247 { 248 if_pseudo_t ip; 249 250 if (sctx->isc_name == NULL) { 251 printf("iflib_clone_register failed - shared_ctx needs to have a device name\n"); 252 return (NULL); 253 } 254 if (iflib_ip_lookup(sctx->isc_name) != NULL) { 255 printf("iflib_clone_register failed - shared_ctx %s alread registered\n", 256 sctx->isc_name); 257 return (NULL); 258 } 259 ip = malloc(sizeof(*ip), M_IFLIB, M_WAITOK|M_ZERO); 260 ip->ip_sctx = sctx; 261 ip->ip_dc = devclass_create(sctx->isc_name); 262 if (ip->ip_dc == NULL) 263 goto fail_clone; 264 /* XXX --- we can handle clone_advanced later */ 265 ip->ip_ifc = if_clone_simple(sctx->isc_name, iflib_clone_create, iflib_clone_destroy, 0); 266 if (ip->ip_ifc == NULL) { 267 printf("clone_simple failed -- cloned %s devices will not be available\n", sctx->isc_name); 268 goto fail_clone; 269 } 270 ip->ip_lladdr_tag = EVENTHANDLER_REGISTER(iflladdr_event, 271 iflib_iflladdr, NULL, EVENTHANDLER_PRI_ANY); 272 if (ip->ip_lladdr_tag == NULL) 273 goto fail_addr; 274 ip->ip_detach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event, 275 iflib_ifdetach, NULL, EVENTHANDLER_PRI_ANY); 276 277 if (ip->ip_detach_tag == NULL) 278 goto fail_depart; 279 280 iflib_ip_insert(ip); 281 return (ip); 282 fail_depart: 283 EVENTHANDLER_DEREGISTER(iflladdr_event, ip->ip_lladdr_tag); 284 fail_addr: 285 if_clone_detach(ip->ip_ifc); 286 fail_clone: 287 free(ip, M_IFLIB); 288 return (NULL); 289 } 290 291 void 292 iflib_clone_deregister(if_pseudo_t ip) 293 { 294 /* XXX check that is not still in use */ 295 iflib_ip_delete(ip); 296 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ip->ip_detach_tag); 297 EVENTHANDLER_DEREGISTER(iflladdr_event, ip->ip_lladdr_tag); 298 if_clone_detach(ip->ip_ifc); 299 /* XXX free devclass */ 300 free(ip, M_IFLIB); 301 } 302