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
62 #include <net/if.h>
63 #include <net/if_var.h>
64 #include <net/if_types.h>
65 #include <net/if_media.h>
66 #include <net/if_clone.h>
67 #include <net/bpf.h>
68 #include <net/ethernet.h>
69 #include <net/vnet.h>
70
71 #include <net/iflib.h>
72 #include <net/iflib_private.h>
73 #include "ifdi_if.h"
74
75 int
noop_attach(device_t dev)76 noop_attach(device_t dev)
77 {
78 return (0);
79 }
80
81 int
iflib_pseudo_detach(device_t dev)82 iflib_pseudo_detach(device_t dev)
83 {
84 if_ctx_t ctx;
85 uint32_t ifc_flags;
86
87 ctx = device_get_softc(dev);
88 ifc_flags = iflib_get_flags(ctx);
89 if ((ifc_flags & IFC_INIT_DONE) == 0)
90 return (0);
91 return (IFDI_DETACH(ctx));
92 }
93
94 static device_t iflib_pseudodev;
95
96 static struct mtx pseudoif_mtx;
97 MTX_SYSINIT(pseudoif_mtx, &pseudoif_mtx, "pseudoif_mtx", MTX_DEF);
98
99 #define PSEUDO_LOCK() mtx_lock(&pseudoif_mtx);
100 #define PSEUDO_UNLOCK() mtx_unlock(&pseudoif_mtx);
101
102 struct if_pseudo {
103 eventhandler_tag ip_detach_tag;
104 eventhandler_tag ip_lladdr_tag;
105 struct if_clone *ip_ifc;
106 if_shared_ctx_t ip_sctx;
107 devclass_t ip_dc;
108 LIST_ENTRY(if_pseudo) ip_list;
109 int ip_on_list;
110 };
111
112 static LIST_HEAD(, if_pseudo) iflib_pseudos = LIST_HEAD_INITIALIZER(iflib_pseudos);
113
114 /*
115 * XXX this assumes that the rest of the
116 * code won't hang on to it after it's
117 * removed / unloaded
118 */
119 static if_pseudo_t
iflib_ip_lookup(const char * name)120 iflib_ip_lookup(const char *name)
121 {
122 if_pseudo_t ip = NULL;
123
124 PSEUDO_LOCK();
125 LIST_FOREACH(ip, &iflib_pseudos, ip_list) {
126 if (!strcmp(ip->ip_sctx->isc_name, name))
127 break;
128 }
129 PSEUDO_UNLOCK();
130 return (ip);
131 }
132
133 static void
iflib_ip_delete(if_pseudo_t ip)134 iflib_ip_delete(if_pseudo_t ip)
135 {
136 PSEUDO_LOCK();
137 if (ip->ip_on_list) {
138 LIST_REMOVE(ip, ip_list);
139 ip->ip_on_list = 0;
140 }
141 PSEUDO_UNLOCK();
142 }
143
144 static void
iflib_ip_insert(if_pseudo_t ip)145 iflib_ip_insert(if_pseudo_t ip)
146 {
147 PSEUDO_LOCK();
148 if (!ip->ip_on_list) {
149 LIST_INSERT_HEAD(&iflib_pseudos, ip, ip_list);
150 ip->ip_on_list = 1;
151 }
152 PSEUDO_UNLOCK();
153 }
154
155 static void
iflib_ifdetach(void * arg __unused,if_t ifp)156 iflib_ifdetach(void *arg __unused, if_t ifp)
157 {
158
159 /* If the ifnet is just being renamed, don't do anything. */
160 if (ifp->if_flags & IFF_RENAMING)
161 return;
162 }
163
164 static void
iflib_iflladdr(void * arg __unused,if_t ifp __unused)165 iflib_iflladdr(void *arg __unused, if_t ifp __unused)
166 {
167
168 }
169
170 static int
iflib_clone_create(struct if_clone * ifc,int unit,caddr_t params)171 iflib_clone_create(struct if_clone *ifc, int unit, caddr_t params)
172 {
173 const char *name = ifc_name(ifc);
174 struct iflib_cloneattach_ctx clctx;
175 if_ctx_t ctx;
176 if_pseudo_t ip;
177 device_t dev;
178 int rc;
179
180 clctx.cc_ifc = ifc;
181 clctx.cc_len = 0;
182 clctx.cc_params = params;
183 clctx.cc_name = name;
184
185 if (__predict_false(iflib_pseudodev == NULL)) {
186 /* SYSINIT initialization would panic !?! */
187 mtx_lock(&Giant);
188 iflib_pseudodev = device_add_child(root_bus, "ifpseudo", 0);
189 mtx_unlock(&Giant);
190 MPASS(iflib_pseudodev != NULL);
191 }
192 ip = iflib_ip_lookup(name);
193 if (ip == NULL) {
194 printf("no ip found for %s\n", name);
195 return (ENOENT);
196 }
197 if ((dev = devclass_get_device(ip->ip_dc, unit)) != NULL) {
198 printf("unit %d allocated\n", unit);
199 bus_generic_print_child(iflib_pseudodev, dev);
200 return (EBUSY);
201 }
202 PSEUDO_LOCK();
203 dev = device_add_child(iflib_pseudodev, name, unit);
204 device_set_driver(dev, &iflib_pseudodriver);
205 PSEUDO_UNLOCK();
206 device_quiet(dev);
207 rc = device_attach(dev);
208 MPASS(rc == 0);
209 MPASS(dev != NULL);
210 MPASS(devclass_get_device(ip->ip_dc, unit) == dev);
211 rc = iflib_pseudo_register(dev, ip->ip_sctx, &ctx, &clctx);
212 if (rc) {
213 mtx_lock(&Giant);
214 device_delete_child(iflib_pseudodev, dev);
215 mtx_unlock(&Giant);
216 } else
217 device_set_softc(dev, ctx);
218
219 return (rc);
220 }
221
222 static void
iflib_clone_destroy(if_t ifp)223 iflib_clone_destroy(if_t ifp)
224 {
225 if_ctx_t ctx;
226 device_t dev;
227 struct sx *ctx_lock;
228 int rc;
229
230 /*
231 * Detach device / free / free unit
232 */
233 ctx = if_getsoftc(ifp);
234 dev = iflib_get_dev(ctx);
235 ctx_lock = iflib_ctx_lock_get(ctx);
236 sx_xlock(ctx_lock);
237 iflib_set_detach(ctx);
238 iflib_stop(ctx);
239 sx_xunlock(ctx_lock);
240
241 mtx_lock(&Giant);
242 rc = device_delete_child(iflib_pseudodev, dev);
243 mtx_unlock(&Giant);
244 if (rc == 0)
245 iflib_pseudo_deregister(ctx);
246 }
247
248 if_pseudo_t
iflib_clone_register(if_shared_ctx_t sctx)249 iflib_clone_register(if_shared_ctx_t sctx)
250 {
251 if_pseudo_t ip;
252
253 if (sctx->isc_name == NULL) {
254 printf("iflib_clone_register failed - shared_ctx needs to have a device name\n");
255 return (NULL);
256 }
257 if (iflib_ip_lookup(sctx->isc_name) != NULL) {
258 printf("iflib_clone_register failed - shared_ctx %s alread registered\n",
259 sctx->isc_name);
260 return (NULL);
261 }
262 ip = malloc(sizeof(*ip), M_IFLIB, M_WAITOK|M_ZERO);
263 ip->ip_sctx = sctx;
264 ip->ip_dc = devclass_create(sctx->isc_name);
265 if (ip->ip_dc == NULL)
266 goto fail_clone;
267 /* XXX --- we can handle clone_advanced later */
268 ip->ip_ifc = if_clone_simple(sctx->isc_name, iflib_clone_create, iflib_clone_destroy, 0);
269 if (ip->ip_ifc == NULL) {
270 printf("clone_simple failed -- cloned %s devices will not be available\n", sctx->isc_name);
271 goto fail_clone;
272 }
273 ifc_flags_set(ip->ip_ifc, IFC_NOGROUP);
274 ip->ip_lladdr_tag = EVENTHANDLER_REGISTER(iflladdr_event,
275 iflib_iflladdr, NULL, EVENTHANDLER_PRI_ANY);
276 if (ip->ip_lladdr_tag == NULL)
277 goto fail_addr;
278 ip->ip_detach_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
279 iflib_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
280
281 if (ip->ip_detach_tag == NULL)
282 goto fail_depart;
283
284 iflib_ip_insert(ip);
285 return (ip);
286 fail_depart:
287 EVENTHANDLER_DEREGISTER(iflladdr_event, ip->ip_lladdr_tag);
288 fail_addr:
289 if_clone_detach(ip->ip_ifc);
290 fail_clone:
291 free(ip, M_IFLIB);
292 return (NULL);
293 }
294
295 void
iflib_clone_deregister(if_pseudo_t ip)296 iflib_clone_deregister(if_pseudo_t ip)
297 {
298 /* XXX check that is not still in use */
299 iflib_ip_delete(ip);
300 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ip->ip_detach_tag);
301 EVENTHANDLER_DEREGISTER(iflladdr_event, ip->ip_lladdr_tag);
302 if_clone_detach(ip->ip_ifc);
303 /* XXX free devclass */
304 free(ip, M_IFLIB);
305 }
306