2 * Copyright (c) 2006-2009 University of Zagreb
3 * Copyright (c) 2006-2009 FreeBSD Foundation
6 * This software was developed by the University of Zagreb and the
7 * FreeBSD Foundation under sponsorship by the Stichting NLnet and the
10 * Copyright (c) 2009 Jeffrey Roberson <jeff@freebsd.org>
11 * Copyright (c) 2009 Robert N. M. Watson
12 * All rights reserved.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
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.
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
39 * This header file defines several sets of interfaces supporting virtualized
42 * - Definition of 'struct vnet' and functions and macros to allocate/free/
45 * - A virtual network stack memory allocator, which provides support for
46 * virtualized global variables via a special linker set, set_vnet.
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.
52 * If VIMAGE isn't compiled into the kernel, virtualized global variables
53 * compile to normal global variables, and virtualized sysinits to regular
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.
65 #if defined(_KERNEL) || defined(_WANT_VNET)
66 #include <sys/queue.h>
69 LIST_ENTRY(vnet) vnet_le; /* all vnets list */
73 u_int vnet_state; /* SI_SUB_* */
75 uintptr_t vnet_data_base;
77 #define VNET_MAGIC_N 0x3e0d8f29
80 * These two virtual network stack allocator definitions are also required
81 * for libkvm so that it can evaluate virtualized global variables.
83 #define VNET_SETNAME "set_vnet"
84 #define VNET_SYMPREFIX "vnet_entry_"
89 #define VNET_PCPUSTAT_DECLARE(type, name) \
90 VNET_DECLARE(counter_u64_t, name[sizeof(type) / sizeof(uint64_t)])
92 #define VNET_PCPUSTAT_DEFINE(type, name) \
93 VNET_DEFINE(counter_u64_t, name[sizeof(type) / sizeof(uint64_t)])
95 #define VNET_PCPUSTAT_ALLOC(name, wait) \
96 COUNTER_ARRAY_ALLOC(VNET(name), \
97 sizeof(VNET(name)) / sizeof(counter_u64_t), (wait))
99 #define VNET_PCPUSTAT_FREE(name) \
100 COUNTER_ARRAY_FREE(VNET(name), sizeof(VNET(name)) / sizeof(counter_u64_t))
102 #define VNET_PCPUSTAT_ADD(type, name, f, v) \
103 counter_u64_add(VNET(name)[offsetof(type, f) / sizeof(uint64_t)], (v))
105 #define VNET_PCPUSTAT_FETCH(type, name, f) \
106 counter_u64_fetch(VNET(name)[offsetof(type, f) / sizeof(uint64_t)])
108 #define VNET_PCPUSTAT_SYSINIT(name) \
110 vnet_##name##_init(const void *unused) \
112 VNET_PCPUSTAT_ALLOC(name, M_WAITOK); \
114 VNET_SYSINIT(vnet_ ## name ## _init, SI_SUB_INIT_IF, \
115 SI_ORDER_FIRST, vnet_ ## name ## _init, NULL)
117 #define VNET_PCPUSTAT_SYSUNINIT(name) \
119 vnet_##name##_uninit(const void *unused) \
121 VNET_PCPUSTAT_FREE(name); \
123 VNET_SYSUNINIT(vnet_ ## name ## _uninit, SI_SUB_INIT_IF, \
124 SI_ORDER_FIRST, vnet_ ## name ## _uninit, NULL)
127 #define SYSCTL_VNET_PCPUSTAT(parent, nbr, name, type, array, desc) \
129 array##_sysctl(SYSCTL_HANDLER_ARGS) \
132 CTASSERT((sizeof(type) / sizeof(uint64_t)) == \
133 (sizeof(VNET(array)) / sizeof(counter_u64_t))); \
134 COUNTER_ARRAY_COPY(VNET(array), &s, sizeof(type) / sizeof(uint64_t));\
136 COUNTER_ARRAY_ZERO(VNET(array), \
137 sizeof(type) / sizeof(uint64_t)); \
138 return (SYSCTL_OUT(req, &s, sizeof(type))); \
140 SYSCTL_PROC(parent, nbr, name, CTLFLAG_VNET | CTLTYPE_OPAQUE | CTLFLAG_RW, \
141 NULL, 0, array ## _sysctl, "I", desc)
142 #endif /* SYSCTL_OID */
145 #include <sys/lock.h>
146 #include <sys/proc.h> /* for struct thread */
147 #include <sys/rwlock.h>
151 * Location of the kernel's 'set_vnet' linker set.
153 extern uintptr_t *__start_set_vnet;
154 __GLOBL(__start_set_vnet);
155 extern uintptr_t *__stop_set_vnet;
156 __GLOBL(__stop_set_vnet);
158 #define VNET_START (uintptr_t)&__start_set_vnet
159 #define VNET_STOP (uintptr_t)&__stop_set_vnet
162 * Functions to allocate and destroy virtual network stacks.
164 struct vnet *vnet_alloc(void);
165 void vnet_destroy(struct vnet *vnet);
168 * The current virtual network stack -- we may wish to move this to struct
169 * pcpu in the future.
171 #define curvnet curthread->td_vnet
174 * Various macros -- get and set the current network stack, but also
177 #if defined(INVARIANTS) || defined(VNET_DEBUG)
178 #define VNET_ASSERT(exp, msg) do { \
183 #define VNET_ASSERT(exp, msg) do { \
188 void vnet_log_recursion(struct vnet *, const char *, int);
190 #define CURVNET_SET_QUIET(arg) \
191 VNET_ASSERT((arg) != NULL && (arg)->vnet_magic_n == VNET_MAGIC_N, \
192 ("CURVNET_SET at %s:%d %s() curvnet=%p vnet=%p", \
193 __FILE__, __LINE__, __func__, curvnet, (arg))); \
194 struct vnet *saved_vnet = curvnet; \
195 const char *saved_vnet_lpush = curthread->td_vnet_lpush; \
197 curthread->td_vnet_lpush = __func__;
199 #define CURVNET_SET_VERBOSE(arg) \
200 CURVNET_SET_QUIET(arg) \
202 vnet_log_recursion(saved_vnet, saved_vnet_lpush, __LINE__);
204 #define CURVNET_SET(arg) CURVNET_SET_VERBOSE(arg)
206 #define CURVNET_RESTORE() \
207 VNET_ASSERT(curvnet != NULL && (saved_vnet == NULL || \
208 saved_vnet->vnet_magic_n == VNET_MAGIC_N), \
209 ("CURVNET_RESTORE at %s:%d %s() curvnet=%p saved_vnet=%p", \
210 __FILE__, __LINE__, __func__, curvnet, saved_vnet)); \
211 curvnet = saved_vnet; \
212 curthread->td_vnet_lpush = saved_vnet_lpush;
213 #else /* !VNET_DEBUG */
215 #define CURVNET_SET_QUIET(arg) \
216 VNET_ASSERT((arg) != NULL && (arg)->vnet_magic_n == VNET_MAGIC_N, \
217 ("CURVNET_SET at %s:%d %s() curvnet=%p vnet=%p", \
218 __FILE__, __LINE__, __func__, curvnet, (arg))); \
219 struct vnet *saved_vnet = curvnet; \
222 #define CURVNET_SET_VERBOSE(arg) \
223 CURVNET_SET_QUIET(arg)
225 #define CURVNET_SET(arg) CURVNET_SET_VERBOSE(arg)
227 #define CURVNET_RESTORE() \
228 VNET_ASSERT(curvnet != NULL && (saved_vnet == NULL || \
229 saved_vnet->vnet_magic_n == VNET_MAGIC_N), \
230 ("CURVNET_RESTORE at %s:%d %s() curvnet=%p saved_vnet=%p", \
231 __FILE__, __LINE__, __func__, curvnet, saved_vnet)); \
232 curvnet = saved_vnet;
233 #endif /* VNET_DEBUG */
235 extern struct vnet *vnet0;
236 #define IS_DEFAULT_VNET(arg) ((arg) == vnet0)
238 #define CRED_TO_VNET(cr) (cr)->cr_prison->pr_vnet
239 #define TD_TO_VNET(td) CRED_TO_VNET((td)->td_ucred)
240 #define P_TO_VNET(p) CRED_TO_VNET((p)->p_ucred)
243 * Global linked list of all virtual network stacks, along with read locks to
244 * access it. If a caller may sleep while accessing the list, it must use
245 * the sleepable lock macros.
247 LIST_HEAD(vnet_list_head, vnet);
248 extern struct vnet_list_head vnet_head;
249 extern struct rwlock vnet_rwlock;
250 extern struct sx vnet_sxlock;
252 #define VNET_LIST_RLOCK() sx_slock(&vnet_sxlock)
253 #define VNET_LIST_RLOCK_NOSLEEP() rw_rlock(&vnet_rwlock)
254 #define VNET_LIST_RUNLOCK() sx_sunlock(&vnet_sxlock)
255 #define VNET_LIST_RUNLOCK_NOSLEEP() rw_runlock(&vnet_rwlock)
258 * Iteration macros to walk the global list of virtual network stacks.
260 #define VNET_ITERATOR_DECL(arg) struct vnet *arg
261 #define VNET_FOREACH(arg) LIST_FOREACH((arg), &vnet_head, vnet_le)
264 * Virtual network stack memory allocator, which allows global variables to
265 * be automatically instantiated for each network stack instance.
267 #define VNET_NAME(n) vnet_entry_##n
268 #define VNET_DECLARE(t, n) extern t VNET_NAME(n)
269 #define VNET_DEFINE(t, n) t VNET_NAME(n) __section(VNET_SETNAME) __used
270 #define _VNET_PTR(b, n) (__typeof(VNET_NAME(n))*) \
271 ((b) + (uintptr_t)&VNET_NAME(n))
273 #define _VNET(b, n) (*_VNET_PTR(b, n))
276 * Virtualized global variable accessor macros.
278 #define VNET_VNET_PTR(vnet, n) _VNET_PTR((vnet)->vnet_data_base, n)
279 #define VNET_VNET(vnet, n) (*VNET_VNET_PTR((vnet), n))
281 #define VNET_PTR(n) VNET_VNET_PTR(curvnet, n)
282 #define VNET(n) VNET_VNET(curvnet, n)
285 * Virtual network stack allocator interfaces from the kernel linker.
287 void *vnet_data_alloc(int size);
288 void vnet_data_copy(void *start, int size);
289 void vnet_data_free(void *start_arg, int size);
292 * Virtual sysinit mechanism, allowing network stack components to declare
293 * startup and shutdown methods to be run when virtual network stack
294 * instances are created and destroyed.
296 #include <sys/kernel.h>
299 * SYSINIT/SYSUNINIT variants that provide per-vnet constructors and
302 struct vnet_sysinit {
303 enum sysinit_sub_id subsystem;
304 enum sysinit_elem_order order;
305 sysinit_cfunc_t func;
307 TAILQ_ENTRY(vnet_sysinit) link;
310 #define VNET_SYSINIT(ident, subsystem, order, func, arg) \
311 static struct vnet_sysinit ident ## _vnet_init = { \
314 (sysinit_cfunc_t)(sysinit_nfunc_t)func, \
317 SYSINIT(vnet_init_ ## ident, subsystem, order, \
318 vnet_register_sysinit, &ident ## _vnet_init); \
319 SYSUNINIT(vnet_init_ ## ident, subsystem, order, \
320 vnet_deregister_sysinit, &ident ## _vnet_init)
322 #define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \
323 static struct vnet_sysinit ident ## _vnet_uninit = { \
326 (sysinit_cfunc_t)(sysinit_nfunc_t)func, \
329 SYSINIT(vnet_uninit_ ## ident, subsystem, order, \
330 vnet_register_sysuninit, &ident ## _vnet_uninit); \
331 SYSUNINIT(vnet_uninit_ ## ident, subsystem, order, \
332 vnet_deregister_sysuninit, &ident ## _vnet_uninit)
335 * Run per-vnet sysinits or sysuninits during vnet creation/destruction.
337 void vnet_sysinit(void);
338 void vnet_sysuninit(void);
341 * Interfaces for managing per-vnet constructors and destructors.
343 void vnet_register_sysinit(void *arg);
344 void vnet_register_sysuninit(void *arg);
345 void vnet_deregister_sysinit(void *arg);
346 void vnet_deregister_sysuninit(void *arg);
349 * EVENTHANDLER(9) extensions.
351 #include <sys/eventhandler.h>
353 void vnet_global_eventhandler_iterator_func(void *, ...);
354 #define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \
356 if (IS_DEFAULT_VNET(curvnet)) { \
357 (tag) = vimage_eventhandler_register(NULL, #name, func, \
359 vnet_global_eventhandler_iterator_func); \
362 #define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority) \
364 if (IS_DEFAULT_VNET(curvnet)) { \
365 vimage_eventhandler_register(NULL, #name, func, \
367 vnet_global_eventhandler_iterator_func); \
374 * Various virtual network stack macros compile to no-ops without VIMAGE.
378 #define VNET_ASSERT(exp, msg)
379 #define CURVNET_SET(arg)
380 #define CURVNET_SET_QUIET(arg)
381 #define CURVNET_RESTORE()
383 #define VNET_LIST_RLOCK()
384 #define VNET_LIST_RLOCK_NOSLEEP()
385 #define VNET_LIST_RUNLOCK()
386 #define VNET_LIST_RUNLOCK_NOSLEEP()
387 #define VNET_ITERATOR_DECL(arg)
388 #define VNET_FOREACH(arg)
390 #define IS_DEFAULT_VNET(arg) 1
391 #define CRED_TO_VNET(cr) NULL
392 #define TD_TO_VNET(td) NULL
393 #define P_TO_VNET(p) NULL
396 * Versions of the VNET macros that compile to normal global variables and
397 * standard sysctl definitions.
399 #define VNET_NAME(n) n
400 #define VNET_DECLARE(t, n) extern t n
401 #define VNET_DEFINE(t, n) t n
402 #define _VNET_PTR(b, n) &VNET_NAME(n)
405 * Virtualized global variable accessor macros.
407 #define VNET_VNET_PTR(vnet, n) (&(n))
408 #define VNET_VNET(vnet, n) (n)
410 #define VNET_PTR(n) (&(n))
414 * When VIMAGE isn't compiled into the kernel, VNET_SYSINIT/VNET_SYSUNINIT
415 * map into normal sysinits, which have the same ordering properties.
417 #define VNET_SYSINIT(ident, subsystem, order, func, arg) \
418 SYSINIT(ident, subsystem, order, func, arg)
419 #define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \
420 SYSUNINIT(ident, subsystem, order, func, arg)
423 * Without VIMAGE revert to the default implementation.
425 #define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \
426 (tag) = eventhandler_register(NULL, #name, func, arg, priority)
427 #define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority) \
428 eventhandler_register(NULL, #name, func, arg, priority)
432 #endif /* !_NET_VNET_H_ */