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
noop_attach(device_t dev)75 noop_attach(device_t dev)
76 {
77 return (0);
78 }
79
80 int
iflib_pseudo_detach(device_t dev)81 iflib_pseudo_detach(device_t dev)
82 {
83 if_ctx_t ctx;
84 uint32_t ifc_flags;
85
86 ctx = device_get_softc(dev);
87 ifc_flags = iflib_get_flags(ctx);
88 if ((ifc_flags & IFC_INIT_DONE) == 0)
89 return (0);
90 return (IFDI_DETACH(ctx));
91 }
92
93 static device_t iflib_pseudodev;
94
95 static struct mtx pseudoif_mtx;
96 MTX_SYSINIT(pseudoif_mtx, &pseudoif_mtx, "pseudoif_mtx", MTX_DEF);
97
98 #define PSEUDO_LOCK() mtx_lock(&pseudoif_mtx);
99 #define PSEUDO_UNLOCK() mtx_unlock(&pseudoif_mtx);
100
101 struct if_pseudo {
102 eventhandler_tag ip_detach_tag;
103 eventhandler_tag ip_lladdr_tag;
104 struct if_clone *ip_ifc;
105 if_shared_ctx_t ip_sctx;
106 devclass_t ip_dc;
107 LIST_ENTRY(if_pseudo) ip_list;
108 int ip_on_list;
109 };
110
111 static LIST_HEAD(, if_pseudo) iflib_pseudos = LIST_HEAD_INITIALIZER(iflib_pseudos);
112
113 /*
114 * XXX this assumes that the rest of the
115 * code won't hang on to it after it's
116 * removed / unloaded
117 */
118 static if_pseudo_t
iflib_ip_lookup(const char * name)119 iflib_ip_lookup(const char *name)
120 {
121 if_pseudo_t ip = NULL;
122
123 PSEUDO_LOCK();
124 LIST_FOREACH(ip, &iflib_pseudos, ip_list) {
125 if (!strcmp(ip->ip_sctx->isc_name, name))
126 break;
127 }
128 PSEUDO_UNLOCK();
129 return (ip);
130 }
131
132 static void
iflib_ip_delete(if_pseudo_t ip)133 iflib_ip_delete(if_pseudo_t ip)
134 {
135 PSEUDO_LOCK();
136 if (ip->ip_on_list) {
137 LIST_REMOVE(ip, ip_list);
138 ip->ip_on_list = 0;
139 }
140 PSEUDO_UNLOCK();
141 }
142
143 static void
iflib_ip_insert(if_pseudo_t ip)144 iflib_ip_insert(if_pseudo_t ip)
145 {
146 PSEUDO_LOCK();
147 if (!ip->ip_on_list) {
148 LIST_INSERT_HEAD(&iflib_pseudos, ip, ip_list);
149 ip->ip_on_list = 1;
150 }
151 PSEUDO_UNLOCK();
152 }
153
154 static void
iflib_ifdetach(void * arg __unused,if_t ifp)155 iflib_ifdetach(void *arg __unused, if_t ifp)
156 {
157
158 /* If the ifnet is just being renamed, don't do anything. */
159 if (ifp->if_flags & IFF_RENAMING)
160 return;
161 }
162
163 static void
iflib_iflladdr(void * arg __unused,if_t ifp __unused)164 iflib_iflladdr(void *arg __unused, if_t ifp __unused)
165 {
166
167 }
168
169 static int
iflib_clone_create(struct if_clone * ifc,int unit,caddr_t params)170 iflib_clone_create(struct if_clone *ifc, int unit, caddr_t params)
171 {
172 const char *name = ifc_name(ifc);
173 struct iflib_cloneattach_ctx clctx;
174 if_ctx_t ctx;
175 if_pseudo_t ip;
176 device_t dev;
177 int rc;
178
179 clctx.cc_ifc = ifc;
180 clctx.cc_len = 0;
181 clctx.cc_params = params;
182 clctx.cc_name = name;
183
184 if (__predict_false(iflib_pseudodev == NULL)) {
185 /* SYSINIT initialization would panic !?! */
186 mtx_lock(&Giant);
187 iflib_pseudodev = device_add_child(root_bus, "ifpseudo", 0);
188 mtx_unlock(&Giant);
189 MPASS(iflib_pseudodev != NULL);
190 }
191 ip = iflib_ip_lookup(name);
192 if (ip == NULL) {
193 printf("no ip found for %s\n", name);
194 return (ENOENT);
195 }
196 if ((dev = devclass_get_device(ip->ip_dc, unit)) != NULL) {
197 printf("unit %d allocated\n", unit);
198 bus_generic_print_child(iflib_pseudodev, dev);
199 return (EBUSY);
200 }
201 PSEUDO_LOCK();
202 dev = device_add_child(iflib_pseudodev, name, unit);
203 device_set_driver(dev, &iflib_pseudodriver);
204 PSEUDO_UNLOCK();
205 device_quiet(dev);
206 rc = device_attach(dev);
207 MPASS(rc == 0);
208 MPASS(dev != NULL);
209 MPASS(devclass_get_device(ip->ip_dc, unit) == dev);
210 rc = iflib_pseudo_register(dev, ip->ip_sctx, &ctx, &clctx);
211 if (rc) {
212 mtx_lock(&Giant);
213 device_delete_child(iflib_pseudodev, dev);
214 mtx_unlock(&Giant);
215 } else
216 device_set_softc(dev, ctx);
217
218 return (rc);
219 }
220
221 static void
iflib_clone_destroy(if_t ifp)222 iflib_clone_destroy(if_t ifp)
223 {
224 if_ctx_t ctx;
225 device_t dev;
226 struct sx *ctx_lock;
227 int rc;
228
229 /*
230 * Detach device / free / free unit
231 */
232 ctx = if_getsoftc(ifp);
233 dev = iflib_get_dev(ctx);
234 ctx_lock = iflib_ctx_lock_get(ctx);
235 sx_xlock(ctx_lock);
236 iflib_set_detach(ctx);
237 iflib_stop(ctx);
238 sx_xunlock(ctx_lock);
239
240 mtx_lock(&Giant);
241 rc = device_delete_child(iflib_pseudodev, dev);
242 mtx_unlock(&Giant);
243 if (rc == 0)
244 iflib_pseudo_deregister(ctx);
245 }
246
247 if_pseudo_t
iflib_clone_register(if_shared_ctx_t sctx)248 iflib_clone_register(if_shared_ctx_t sctx)
249 {
250 if_pseudo_t ip;
251
252 if (sctx->isc_name == NULL) {
253 printf("iflib_clone_register failed - shared_ctx needs to have a device name\n");
254 return (NULL);
255 }
256 if (iflib_ip_lookup(sctx->isc_name) != NULL) {
257 printf("iflib_clone_register failed - shared_ctx %s alread registered\n",
258 sctx->isc_name);
259 return (NULL);
260 }
261 ip = malloc(sizeof(*ip), M_IFLIB, M_WAITOK|M_ZERO);
262 ip->ip_sctx = sctx;
263 ip->ip_dc = devclass_create(sctx->isc_name);
264 if (ip->ip_dc == NULL)
265 goto fail_clone;
266 /* XXX --- we can handle clone_advanced later */
267 ip->ip_ifc = if_clone_simple(sctx->isc_name, iflib_clone_create, iflib_clone_destroy, 0);
268 if (ip->ip_ifc == NULL) {
269 printf("clone_simple failed -- cloned %s devices will not be available\n", sctx->isc_name);
270 goto fail_clone;
271 }
272 ip->ip_lladdr_tag = EVENTHANDLER_REGISTER(iflladdr_event,
273 iflib_iflladdr, NULL, EVENTHANDLER_PRI_ANY);
274 if (ip->ip_lladdr_tag == NULL)
275 goto fail_addr;
276 ip->ip_detach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
277 iflib_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
278
279 if (ip->ip_detach_tag == NULL)
280 goto fail_depart;
281
282 iflib_ip_insert(ip);
283 return (ip);
284 fail_depart:
285 EVENTHANDLER_DEREGISTER(iflladdr_event, ip->ip_lladdr_tag);
286 fail_addr:
287 if_clone_detach(ip->ip_ifc);
288 fail_clone:
289 free(ip, M_IFLIB);
290 return (NULL);
291 }
292
293 void
iflib_clone_deregister(if_pseudo_t ip)294 iflib_clone_deregister(if_pseudo_t ip)
295 {
296 /* XXX check that is not still in use */
297 iflib_ip_delete(ip);
298 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ip->ip_detach_tag);
299 EVENTHANDLER_DEREGISTER(iflladdr_event, ip->ip_lladdr_tag);
300 if_clone_detach(ip->ip_ifc);
301 /* XXX free devclass */
302 free(ip, M_IFLIB);
303 }
304