FreeBSD/Linux Kernel Cross Reference
sys/net/vnet.h
1 /*-
2 * Copyright (c) 2006-2009 University of Zagreb
3 * Copyright (c) 2006-2009 FreeBSD Foundation
4 * All rights reserved.
5 *
6 * This software was developed by the University of Zagreb and the
7 * FreeBSD Foundation under sponsorship by the Stichting NLnet and the
8 * FreeBSD Foundation.
9 *
10 * Copyright (c) 2009 Jeffrey Roberson <jeff@freebsd.org>
11 * Copyright (c) 2009 Robert N. M. Watson
12 * All rights reserved.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * $FreeBSD: releng/10.2/sys/net/vnet.h 262735 2014-03-04 14:05:37Z glebius $
36 */
37
38 /*-
39 * This header file defines several sets of interfaces supporting virtualized
40 * network stacks:
41 *
42 * - Definition of 'struct vnet' and functions and macros to allocate/free/
43 * manipulate it.
44 *
45 * - A virtual network stack memory allocator, which provides support for
46 * virtualized global variables via a special linker set, set_vnet.
47 *
48 * - Virtualized sysinits/sysuninits, which allow constructors and
49 * destructors to be run for each network stack subsystem as virtual
50 * instances are created and destroyed.
51 *
52 * If VIMAGE isn't compiled into the kernel, virtualized global variables
53 * compile to normal global variables, and virtualized sysinits to regular
54 * sysinits.
55 */
56
57 #ifndef _NET_VNET_H_
58 #define _NET_VNET_H_
59
60 /*
61 * struct vnet describes a virtualized network stack, and is primarily a
62 * pointer to storage for virtualized global variables. Expose to userspace
63 * as required for libkvm.
64 */
65 #if defined(_KERNEL) || defined(_WANT_VNET)
66 #include <sys/queue.h>
67
68 struct vnet {
69 LIST_ENTRY(vnet) vnet_le; /* all vnets list */
70 u_int vnet_magic_n;
71 u_int vnet_ifcnt;
72 u_int vnet_sockcnt;
73 void *vnet_data_mem;
74 uintptr_t vnet_data_base;
75 };
76 #define VNET_MAGIC_N 0x3e0d8f29
77
78 /*
79 * These two virtual network stack allocator definitions are also required
80 * for libkvm so that it can evaluate virtualized global variables.
81 */
82 #define VNET_SETNAME "set_vnet"
83 #define VNET_SYMPREFIX "vnet_entry_"
84 #endif
85
86 #ifdef _KERNEL
87
88 #define VNET_PCPUSTAT_DECLARE(type, name) \
89 VNET_DECLARE(counter_u64_t, name[sizeof(type) / sizeof(uint64_t)])
90
91 #define VNET_PCPUSTAT_DEFINE(type, name) \
92 VNET_DEFINE(counter_u64_t, name[sizeof(type) / sizeof(uint64_t)])
93
94 #define VNET_PCPUSTAT_ALLOC(name, wait) \
95 COUNTER_ARRAY_ALLOC(VNET(name), \
96 sizeof(VNET(name)) / sizeof(counter_u64_t), (wait))
97
98 #define VNET_PCPUSTAT_FREE(name) \
99 COUNTER_ARRAY_FREE(VNET(name), sizeof(VNET(name)) / sizeof(counter_u64_t))
100
101 #define VNET_PCPUSTAT_ADD(type, name, f, v) \
102 counter_u64_add(VNET(name)[offsetof(type, f) / sizeof(uint64_t)], (v))
103
104 #define VNET_PCPUSTAT_SYSINIT(name) \
105 static void \
106 vnet_##name##_init(const void *unused) \
107 { \
108 VNET_PCPUSTAT_ALLOC(name, M_WAITOK); \
109 } \
110 VNET_SYSINIT(vnet_ ## name ## _init, SI_SUB_PROTO_IFATTACHDOMAIN, \
111 SI_ORDER_ANY, vnet_ ## name ## _init, NULL)
112
113 #define VNET_PCPUSTAT_SYSUNINIT(name) \
114 static void \
115 vnet_##name##_uninit(const void *unused) \
116 { \
117 VNET_PCPUSTAT_FREE(name); \
118 } \
119 VNET_SYSUNINIT(vnet_ ## name ## _uninit, SI_SUB_PROTO_IFATTACHDOMAIN, \
120 SI_ORDER_ANY, vnet_ ## name ## _uninit, NULL)
121
122 #define SYSCTL_VNET_PCPUSTAT(parent, nbr, name, type, array, desc) \
123 static int \
124 array##_sysctl(SYSCTL_HANDLER_ARGS) \
125 { \
126 type s; \
127 CTASSERT((sizeof(type) / sizeof(uint64_t)) == \
128 (sizeof(VNET(array)) / sizeof(counter_u64_t))); \
129 COUNTER_ARRAY_COPY(VNET(array), &s, sizeof(type) / sizeof(uint64_t));\
130 if (req->newptr) \
131 COUNTER_ARRAY_ZERO(VNET(array), \
132 sizeof(type) / sizeof(uint64_t)); \
133 return (SYSCTL_OUT(req, &s, sizeof(type))); \
134 } \
135 SYSCTL_VNET_PROC(parent, nbr, name, CTLTYPE_OPAQUE | CTLFLAG_RW, NULL, \
136 0, array ## _sysctl, "I", desc)
137
138 #ifdef VIMAGE
139 #include <sys/lock.h>
140 #include <sys/proc.h> /* for struct thread */
141 #include <sys/rwlock.h>
142 #include <sys/sx.h>
143
144 /*
145 * Location of the kernel's 'set_vnet' linker set.
146 */
147 extern uintptr_t *__start_set_vnet;
148 __GLOBL(__start_set_vnet);
149 extern uintptr_t *__stop_set_vnet;
150 __GLOBL(__stop_set_vnet);
151
152 #define VNET_START (uintptr_t)&__start_set_vnet
153 #define VNET_STOP (uintptr_t)&__stop_set_vnet
154
155 /*
156 * Functions to allocate and destroy virtual network stacks.
157 */
158 struct vnet *vnet_alloc(void);
159 void vnet_destroy(struct vnet *vnet);
160
161 /*
162 * The current virtual network stack -- we may wish to move this to struct
163 * pcpu in the future.
164 */
165 #define curvnet curthread->td_vnet
166
167 /*
168 * Various macros -- get and set the current network stack, but also
169 * assertions.
170 */
171 #if defined(INVARIANTS) || defined(VNET_DEBUG)
172 #define VNET_ASSERT(exp, msg) do { \
173 if (!(exp)) \
174 panic msg; \
175 } while (0)
176 #else
177 #define VNET_ASSERT(exp, msg) do { \
178 } while (0)
179 #endif
180
181 #ifdef VNET_DEBUG
182 void vnet_log_recursion(struct vnet *, const char *, int);
183
184 #define CURVNET_SET_QUIET(arg) \
185 VNET_ASSERT((arg) != NULL && (arg)->vnet_magic_n == VNET_MAGIC_N, \
186 ("CURVNET_SET at %s:%d %s() curvnet=%p vnet=%p", \
187 __FILE__, __LINE__, __func__, curvnet, (arg))); \
188 struct vnet *saved_vnet = curvnet; \
189 const char *saved_vnet_lpush = curthread->td_vnet_lpush; \
190 curvnet = arg; \
191 curthread->td_vnet_lpush = __func__;
192
193 #define CURVNET_SET_VERBOSE(arg) \
194 CURVNET_SET_QUIET(arg) \
195 if (saved_vnet) \
196 vnet_log_recursion(saved_vnet, saved_vnet_lpush, __LINE__);
197
198 #define CURVNET_SET(arg) CURVNET_SET_VERBOSE(arg)
199
200 #define CURVNET_RESTORE() \
201 VNET_ASSERT(curvnet != NULL && (saved_vnet == NULL || \
202 saved_vnet->vnet_magic_n == VNET_MAGIC_N), \
203 ("CURVNET_RESTORE at %s:%d %s() curvnet=%p saved_vnet=%p", \
204 __FILE__, __LINE__, __func__, curvnet, saved_vnet)); \
205 curvnet = saved_vnet; \
206 curthread->td_vnet_lpush = saved_vnet_lpush;
207 #else /* !VNET_DEBUG */
208
209 #define CURVNET_SET_QUIET(arg) \
210 VNET_ASSERT((arg) != NULL && (arg)->vnet_magic_n == VNET_MAGIC_N, \
211 ("CURVNET_SET at %s:%d %s() curvnet=%p vnet=%p", \
212 __FILE__, __LINE__, __func__, curvnet, (arg))); \
213 struct vnet *saved_vnet = curvnet; \
214 curvnet = arg;
215
216 #define CURVNET_SET_VERBOSE(arg) \
217 CURVNET_SET_QUIET(arg)
218
219 #define CURVNET_SET(arg) CURVNET_SET_VERBOSE(arg)
220
221 #define CURVNET_RESTORE() \
222 VNET_ASSERT(curvnet != NULL && (saved_vnet == NULL || \
223 saved_vnet->vnet_magic_n == VNET_MAGIC_N), \
224 ("CURVNET_RESTORE at %s:%d %s() curvnet=%p saved_vnet=%p", \
225 __FILE__, __LINE__, __func__, curvnet, saved_vnet)); \
226 curvnet = saved_vnet;
227 #endif /* VNET_DEBUG */
228
229 extern struct vnet *vnet0;
230 #define IS_DEFAULT_VNET(arg) ((arg) == vnet0)
231
232 #define CRED_TO_VNET(cr) (cr)->cr_prison->pr_vnet
233 #define TD_TO_VNET(td) CRED_TO_VNET((td)->td_ucred)
234 #define P_TO_VNET(p) CRED_TO_VNET((p)->p_ucred)
235
236 /*
237 * Global linked list of all virtual network stacks, along with read locks to
238 * access it. If a caller may sleep while accessing the list, it must use
239 * the sleepable lock macros.
240 */
241 LIST_HEAD(vnet_list_head, vnet);
242 extern struct vnet_list_head vnet_head;
243 extern struct rwlock vnet_rwlock;
244 extern struct sx vnet_sxlock;
245
246 #define VNET_LIST_RLOCK() sx_slock(&vnet_sxlock)
247 #define VNET_LIST_RLOCK_NOSLEEP() rw_rlock(&vnet_rwlock)
248 #define VNET_LIST_RUNLOCK() sx_sunlock(&vnet_sxlock)
249 #define VNET_LIST_RUNLOCK_NOSLEEP() rw_runlock(&vnet_rwlock)
250
251 /*
252 * Iteration macros to walk the global list of virtual network stacks.
253 */
254 #define VNET_ITERATOR_DECL(arg) struct vnet *arg
255 #define VNET_FOREACH(arg) LIST_FOREACH((arg), &vnet_head, vnet_le)
256
257 /*
258 * Virtual network stack memory allocator, which allows global variables to
259 * be automatically instantiated for each network stack instance.
260 */
261 #define VNET_NAME(n) vnet_entry_##n
262 #define VNET_DECLARE(t, n) extern t VNET_NAME(n)
263 #define VNET_DEFINE(t, n) t VNET_NAME(n) __section(VNET_SETNAME) __used
264 #define _VNET_PTR(b, n) (__typeof(VNET_NAME(n))*) \
265 ((b) + (uintptr_t)&VNET_NAME(n))
266
267 #define _VNET(b, n) (*_VNET_PTR(b, n))
268
269 /*
270 * Virtualized global variable accessor macros.
271 */
272 #define VNET_VNET_PTR(vnet, n) _VNET_PTR((vnet)->vnet_data_base, n)
273 #define VNET_VNET(vnet, n) (*VNET_VNET_PTR((vnet), n))
274
275 #define VNET_PTR(n) VNET_VNET_PTR(curvnet, n)
276 #define VNET(n) VNET_VNET(curvnet, n)
277
278 /*
279 * Virtual network stack allocator interfaces from the kernel linker.
280 */
281 void *vnet_data_alloc(int size);
282 void vnet_data_copy(void *start, int size);
283 void vnet_data_free(void *start_arg, int size);
284
285 /*
286 * Sysctl variants for vnet-virtualized global variables. Include
287 * <sys/sysctl.h> to expose these definitions.
288 *
289 * Note: SYSCTL_PROC() handler functions will need to resolve pointer
290 * arguments themselves, if required.
291 */
292 #ifdef SYSCTL_OID
293 #define SYSCTL_VNET_INT(parent, nbr, name, access, ptr, val, descr) \
294 SYSCTL_OID(parent, nbr, name, \
295 CTLTYPE_INT|CTLFLAG_MPSAFE|CTLFLAG_VNET|(access), \
296 ptr, val, sysctl_handle_int, "I", descr)
297 #define SYSCTL_VNET_PROC(parent, nbr, name, access, ptr, arg, handler, \
298 fmt, descr) \
299 CTASSERT(((access) & CTLTYPE) != 0); \
300 SYSCTL_OID(parent, nbr, name, CTLFLAG_VNET|(access), ptr, arg, \
301 handler, fmt, descr)
302 #define SYSCTL_VNET_OPAQUE(parent, nbr, name, access, ptr, len, fmt, \
303 descr) \
304 SYSCTL_OID(parent, nbr, name, \
305 CTLTYPE_OPAQUE|CTLFLAG_VNET|(access), ptr, len, \
306 sysctl_handle_opaque, fmt, descr)
307 #define SYSCTL_VNET_STRING(parent, nbr, name, access, arg, len, descr) \
308 SYSCTL_OID(parent, nbr, name, \
309 CTLTYPE_STRING|CTLFLAG_VNET|(access), \
310 arg, len, sysctl_handle_string, "A", descr)
311 #define SYSCTL_VNET_STRUCT(parent, nbr, name, access, ptr, type, descr) \
312 SYSCTL_OID(parent, nbr, name, \
313 CTLTYPE_OPAQUE|CTLFLAG_VNET|(access), ptr, \
314 sizeof(struct type), sysctl_handle_opaque, "S," #type, \
315 descr)
316 #define SYSCTL_VNET_UINT(parent, nbr, name, access, ptr, val, descr) \
317 SYSCTL_OID(parent, nbr, name, \
318 CTLTYPE_UINT|CTLFLAG_MPSAFE|CTLFLAG_VNET|(access), \
319 ptr, val, sysctl_handle_int, "IU", descr)
320 #define VNET_SYSCTL_ARG(req, arg1) do { \
321 if (arg1 != NULL) \
322 arg1 = (void *)(TD_TO_VNET((req)->td)->vnet_data_base + \
323 (uintptr_t)(arg1)); \
324 } while (0)
325 #endif /* SYSCTL_OID */
326
327 /*
328 * Virtual sysinit mechanism, allowing network stack components to declare
329 * startup and shutdown methods to be run when virtual network stack
330 * instances are created and destroyed.
331 */
332 #include <sys/kernel.h>
333
334 /*
335 * SYSINIT/SYSUNINIT variants that provide per-vnet constructors and
336 * destructors.
337 */
338 struct vnet_sysinit {
339 enum sysinit_sub_id subsystem;
340 enum sysinit_elem_order order;
341 sysinit_cfunc_t func;
342 const void *arg;
343 TAILQ_ENTRY(vnet_sysinit) link;
344 };
345
346 #define VNET_SYSINIT(ident, subsystem, order, func, arg) \
347 static struct vnet_sysinit ident ## _vnet_init = { \
348 subsystem, \
349 order, \
350 (sysinit_cfunc_t)(sysinit_nfunc_t)func, \
351 (arg) \
352 }; \
353 SYSINIT(vnet_init_ ## ident, subsystem, order, \
354 vnet_register_sysinit, &ident ## _vnet_init); \
355 SYSUNINIT(vnet_init_ ## ident, subsystem, order, \
356 vnet_deregister_sysinit, &ident ## _vnet_init)
357
358 #define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \
359 static struct vnet_sysinit ident ## _vnet_uninit = { \
360 subsystem, \
361 order, \
362 (sysinit_cfunc_t)(sysinit_nfunc_t)func, \
363 (arg) \
364 }; \
365 SYSINIT(vnet_uninit_ ## ident, subsystem, order, \
366 vnet_register_sysuninit, &ident ## _vnet_uninit); \
367 SYSUNINIT(vnet_uninit_ ## ident, subsystem, order, \
368 vnet_deregister_sysuninit, &ident ## _vnet_uninit)
369
370 /*
371 * Run per-vnet sysinits or sysuninits during vnet creation/destruction.
372 */
373 void vnet_sysinit(void);
374 void vnet_sysuninit(void);
375
376 /*
377 * Interfaces for managing per-vnet constructors and destructors.
378 */
379 void vnet_register_sysinit(void *arg);
380 void vnet_register_sysuninit(void *arg);
381 void vnet_deregister_sysinit(void *arg);
382 void vnet_deregister_sysuninit(void *arg);
383
384 /*
385 * EVENTHANDLER(9) extensions.
386 */
387 #include <sys/eventhandler.h>
388
389 void vnet_global_eventhandler_iterator_func(void *, ...);
390 #define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \
391 do { \
392 if (IS_DEFAULT_VNET(curvnet)) { \
393 (tag) = vimage_eventhandler_register(NULL, #name, func, \
394 arg, priority, \
395 vnet_global_eventhandler_iterator_func); \
396 } \
397 } while(0)
398 #define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority) \
399 do { \
400 if (IS_DEFAULT_VNET(curvnet)) { \
401 vimage_eventhandler_register(NULL, #name, func, \
402 arg, priority, \
403 vnet_global_eventhandler_iterator_func); \
404 } \
405 } while(0)
406
407 #else /* !VIMAGE */
408
409 /*
410 * Various virtual network stack macros compile to no-ops without VIMAGE.
411 */
412 #define curvnet NULL
413
414 #define VNET_ASSERT(exp, msg)
415 #define CURVNET_SET(arg)
416 #define CURVNET_SET_QUIET(arg)
417 #define CURVNET_RESTORE()
418
419 #define VNET_LIST_RLOCK()
420 #define VNET_LIST_RLOCK_NOSLEEP()
421 #define VNET_LIST_RUNLOCK()
422 #define VNET_LIST_RUNLOCK_NOSLEEP()
423 #define VNET_ITERATOR_DECL(arg)
424 #define VNET_FOREACH(arg)
425
426 #define IS_DEFAULT_VNET(arg) 1
427 #define CRED_TO_VNET(cr) NULL
428 #define TD_TO_VNET(td) NULL
429 #define P_TO_VNET(p) NULL
430
431 /*
432 * Versions of the VNET macros that compile to normal global variables and
433 * standard sysctl definitions.
434 */
435 #define VNET_NAME(n) n
436 #define VNET_DECLARE(t, n) extern t n
437 #define VNET_DEFINE(t, n) t n
438 #define _VNET_PTR(b, n) &VNET_NAME(n)
439
440 /*
441 * Virtualized global variable accessor macros.
442 */
443 #define VNET_VNET_PTR(vnet, n) (&(n))
444 #define VNET_VNET(vnet, n) (n)
445
446 #define VNET_PTR(n) (&(n))
447 #define VNET(n) (n)
448
449 /*
450 * When VIMAGE isn't compiled into the kernel, virtaulized SYSCTLs simply
451 * become normal SYSCTLs.
452 */
453 #ifdef SYSCTL_OID
454 #define SYSCTL_VNET_INT(parent, nbr, name, access, ptr, val, descr) \
455 SYSCTL_INT(parent, nbr, name, access, ptr, val, descr)
456 #define SYSCTL_VNET_PROC(parent, nbr, name, access, ptr, arg, handler, \
457 fmt, descr) \
458 SYSCTL_PROC(parent, nbr, name, access, ptr, arg, handler, fmt, \
459 descr)
460 #define SYSCTL_VNET_OPAQUE(parent, nbr, name, access, ptr, len, fmt, \
461 descr) \
462 SYSCTL_OPAQUE(parent, nbr, name, access, ptr, len, fmt, descr)
463 #define SYSCTL_VNET_STRING(parent, nbr, name, access, arg, len, descr) \
464 SYSCTL_STRING(parent, nbr, name, access, arg, len, descr)
465 #define SYSCTL_VNET_STRUCT(parent, nbr, name, access, ptr, type, descr) \
466 SYSCTL_STRUCT(parent, nbr, name, access, ptr, type, descr)
467 #define SYSCTL_VNET_UINT(parent, nbr, name, access, ptr, val, descr) \
468 SYSCTL_UINT(parent, nbr, name, access, ptr, val, descr)
469 #define VNET_SYSCTL_ARG(req, arg1)
470 #endif /* SYSCTL_OID */
471
472 /*
473 * When VIMAGE isn't compiled into the kernel, VNET_SYSINIT/VNET_SYSUNINIT
474 * map into normal sysinits, which have the same ordering properties.
475 */
476 #define VNET_SYSINIT(ident, subsystem, order, func, arg) \
477 SYSINIT(ident, subsystem, order, func, arg)
478 #define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \
479 SYSUNINIT(ident, subsystem, order, func, arg)
480
481 /*
482 * Without VIMAGE revert to the default implementation.
483 */
484 #define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \
485 (tag) = eventhandler_register(NULL, #name, func, arg, priority)
486 #define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority) \
487 eventhandler_register(NULL, #name, func, arg, priority)
488 #endif /* VIMAGE */
489 #endif /* _KERNEL */
490
491 #endif /* !_NET_VNET_H_ */
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