vnet.h (15098B) - Raw
1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2006-2009 University of Zagreb 5 * Copyright (c) 2006-2009 FreeBSD Foundation 6 * All rights reserved. 7 * 8 * This software was developed by the University of Zagreb and the 9 * FreeBSD Foundation under sponsorship by the Stichting NLnet and the 10 * FreeBSD Foundation. 11 * 12 * Copyright (c) 2009 Jeffrey Roberson <jeff@freebsd.org> 13 * Copyright (c) 2009 Robert N. M. Watson 14 * All rights reserved. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 2. Redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 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 <machine/param.h> /* for CACHE_LINE_SIZE */ 67 #include <sys/queue.h> 68 69 struct vnet { 70 LIST_ENTRY(vnet) vnet_le; /* all vnets list */ 71 u_int vnet_magic_n; 72 u_int vnet_ifcnt; 73 u_int vnet_sockcnt; 74 u_int vnet_state; /* SI_SUB_* */ 75 void *vnet_data_mem; 76 uintptr_t vnet_data_base; 77 bool vnet_shutdown; /* Shutdown in progress. */ 78 } __aligned(CACHE_LINE_SIZE); 79 #define VNET_MAGIC_N 0x5e4a6f28 80 81 /* 82 * These two virtual network stack allocator definitions are also required 83 * for libkvm so that it can evaluate virtualized global variables. 84 */ 85 #define VNET_SETNAME "set_vnet" 86 #define VNET_SYMPREFIX "vnet_entry_" 87 #endif 88 89 #ifdef _KERNEL 90 91 #define VNET_PCPUSTAT_DECLARE(type, name) \ 92 VNET_DECLARE(counter_u64_t, name[sizeof(type) / sizeof(uint64_t)]) 93 94 #define VNET_PCPUSTAT_DEFINE(type, name) \ 95 VNET_DEFINE(counter_u64_t, name[sizeof(type) / sizeof(uint64_t)]) 96 #define VNET_PCPUSTAT_DEFINE_STATIC(type, name) \ 97 VNET_DEFINE_STATIC(counter_u64_t, name[sizeof(type) / sizeof(uint64_t)]) 98 99 #define VNET_PCPUSTAT_ALLOC(name, wait) \ 100 COUNTER_ARRAY_ALLOC(VNET(name), \ 101 sizeof(VNET(name)) / sizeof(counter_u64_t), (wait)) 102 103 #define VNET_PCPUSTAT_FREE(name) \ 104 COUNTER_ARRAY_FREE(VNET(name), sizeof(VNET(name)) / sizeof(counter_u64_t)) 105 106 #define VNET_PCPUSTAT_ADD(type, name, f, v) \ 107 counter_u64_add(VNET(name)[offsetof(type, f) / sizeof(uint64_t)], (v)) 108 109 #define VNET_PCPUSTAT_FETCH(type, name, f) \ 110 counter_u64_fetch(VNET(name)[offsetof(type, f) / sizeof(uint64_t)]) 111 112 #define VNET_PCPUSTAT_SYSINIT(name) \ 113 static void \ 114 vnet_##name##_init(const void *unused) \ 115 { \ 116 VNET_PCPUSTAT_ALLOC(name, M_WAITOK); \ 117 } \ 118 VNET_SYSINIT(vnet_ ## name ## _init, SI_SUB_INIT_IF, \ 119 SI_ORDER_FIRST, vnet_ ## name ## _init, NULL) 120 121 #define VNET_PCPUSTAT_SYSUNINIT(name) \ 122 static void \ 123 vnet_##name##_uninit(const void *unused) \ 124 { \ 125 VNET_PCPUSTAT_FREE(name); \ 126 } \ 127 VNET_SYSUNINIT(vnet_ ## name ## _uninit, SI_SUB_INIT_IF, \ 128 SI_ORDER_FIRST, vnet_ ## name ## _uninit, NULL) 129 130 #ifdef SYSCTL_OID 131 #define SYSCTL_VNET_PCPUSTAT(parent, nbr, name, type, array, desc) \ 132 static int \ 133 array##_sysctl(SYSCTL_HANDLER_ARGS) \ 134 { \ 135 type s; \ 136 CTASSERT((sizeof(type) / sizeof(uint64_t)) == \ 137 (sizeof(VNET(array)) / sizeof(counter_u64_t))); \ 138 COUNTER_ARRAY_COPY(VNET(array), &s, sizeof(type) / sizeof(uint64_t));\ 139 if (req->newptr) \ 140 COUNTER_ARRAY_ZERO(VNET(array), \ 141 sizeof(type) / sizeof(uint64_t)); \ 142 return (SYSCTL_OUT(req, &s, sizeof(type))); \ 143 } \ 144 SYSCTL_PROC(parent, nbr, name, \ 145 CTLFLAG_VNET | CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_NEEDGIANT, \ 146 NULL, 0, array ## _sysctl, "I", desc) 147 #endif /* SYSCTL_OID */ 148 149 #ifdef VIMAGE 150 #include <sys/lock.h> 151 #include <sys/proc.h> /* for struct thread */ 152 #include <sys/rwlock.h> 153 #include <sys/sx.h> 154 155 /* 156 * Location of the kernel's 'set_vnet' linker set. 157 */ 158 extern uintptr_t *__start_set_vnet; 159 __GLOBL(__start_set_vnet); 160 extern uintptr_t *__stop_set_vnet; 161 __GLOBL(__stop_set_vnet); 162 163 #define VNET_START (uintptr_t)&__start_set_vnet 164 #define VNET_STOP (uintptr_t)&__stop_set_vnet 165 166 /* 167 * Functions to allocate and destroy virtual network stacks. 168 */ 169 struct vnet *vnet_alloc(void); 170 void vnet_destroy(struct vnet *vnet); 171 172 /* 173 * The current virtual network stack -- we may wish to move this to struct 174 * pcpu in the future. 175 */ 176 #define curvnet curthread->td_vnet 177 178 /* 179 * Various macros -- get and set the current network stack, but also 180 * assertions. 181 */ 182 #if defined(INVARIANTS) || defined(VNET_DEBUG) 183 #define VNET_ASSERT(exp, msg) do { \ 184 if (!(exp)) \ 185 panic msg; \ 186 } while (0) 187 #else 188 #define VNET_ASSERT(exp, msg) do { \ 189 } while (0) 190 #endif 191 192 #ifdef VNET_DEBUG 193 void vnet_log_recursion(struct vnet *, const char *, int); 194 195 #define CURVNET_SET_QUIET(arg) \ 196 VNET_ASSERT((arg) != NULL && (arg)->vnet_magic_n == VNET_MAGIC_N, \ 197 ("CURVNET_SET at %s:%d %s() curvnet=%p vnet=%p", \ 198 __FILE__, __LINE__, __func__, curvnet, (arg))); \ 199 struct vnet *saved_vnet = curvnet; \ 200 const char *saved_vnet_lpush = curthread->td_vnet_lpush; \ 201 curvnet = arg; \ 202 curthread->td_vnet_lpush = __func__; 203 204 #define CURVNET_SET_VERBOSE(arg) \ 205 CURVNET_SET_QUIET(arg) \ 206 if (saved_vnet) \ 207 vnet_log_recursion(saved_vnet, saved_vnet_lpush, __LINE__); 208 209 #define CURVNET_SET(arg) CURVNET_SET_VERBOSE(arg) 210 211 #define CURVNET_RESTORE() \ 212 VNET_ASSERT(curvnet != NULL && (saved_vnet == NULL || \ 213 saved_vnet->vnet_magic_n == VNET_MAGIC_N), \ 214 ("CURVNET_RESTORE at %s:%d %s() curvnet=%p saved_vnet=%p", \ 215 __FILE__, __LINE__, __func__, curvnet, saved_vnet)); \ 216 curvnet = saved_vnet; \ 217 curthread->td_vnet_lpush = saved_vnet_lpush; 218 #else /* !VNET_DEBUG */ 219 220 #define CURVNET_SET_QUIET(arg) \ 221 VNET_ASSERT((arg) != NULL && (arg)->vnet_magic_n == VNET_MAGIC_N, \ 222 ("CURVNET_SET at %s:%d %s() curvnet=%p vnet=%p", \ 223 __FILE__, __LINE__, __func__, curvnet, (arg))); \ 224 struct vnet *saved_vnet = curvnet; \ 225 curvnet = arg; 226 227 #define CURVNET_SET_VERBOSE(arg) \ 228 CURVNET_SET_QUIET(arg) 229 230 #define CURVNET_SET(arg) CURVNET_SET_VERBOSE(arg) 231 232 #define CURVNET_RESTORE() \ 233 VNET_ASSERT(curvnet != NULL && (saved_vnet == NULL || \ 234 saved_vnet->vnet_magic_n == VNET_MAGIC_N), \ 235 ("CURVNET_RESTORE at %s:%d %s() curvnet=%p saved_vnet=%p", \ 236 __FILE__, __LINE__, __func__, curvnet, saved_vnet)); \ 237 curvnet = saved_vnet; 238 #endif /* VNET_DEBUG */ 239 240 #define CURVNET_ASSERT_SET() \ 241 VNET_ASSERT(curvnet != NULL, ("vnet is not set at %s:%d %s()", \ 242 __FILE__, __LINE__, __func__)) 243 244 extern struct vnet *vnet0; 245 #define IS_DEFAULT_VNET(arg) ((arg) == vnet0) 246 247 #define CRED_TO_VNET(cr) (cr)->cr_prison->pr_vnet 248 #define TD_TO_VNET(td) CRED_TO_VNET((td)->td_ucred) 249 #define P_TO_VNET(p) CRED_TO_VNET((p)->p_ucred) 250 251 /* 252 * Global linked list of all virtual network stacks, along with read locks to 253 * access it. If a caller may sleep while accessing the list, it must use 254 * the sleepable lock macros. 255 */ 256 LIST_HEAD(vnet_list_head, vnet); 257 extern struct vnet_list_head vnet_head; 258 extern struct rwlock vnet_rwlock; 259 extern struct sx vnet_sxlock; 260 261 #define VNET_LIST_RLOCK() sx_slock(&vnet_sxlock) 262 #define VNET_LIST_RLOCK_NOSLEEP() rw_rlock(&vnet_rwlock) 263 #define VNET_LIST_RUNLOCK() sx_sunlock(&vnet_sxlock) 264 #define VNET_LIST_RUNLOCK_NOSLEEP() rw_runlock(&vnet_rwlock) 265 266 /* 267 * Iteration macros to walk the global list of virtual network stacks. 268 */ 269 #define VNET_ITERATOR_DECL(arg) struct vnet *arg 270 #define VNET_FOREACH(arg) LIST_FOREACH((arg), &vnet_head, vnet_le) 271 272 /* 273 * Virtual network stack memory allocator, which allows global variables to 274 * be automatically instantiated for each network stack instance. 275 */ 276 #define VNET_NAME(n) vnet_entry_##n 277 #define VNET_DECLARE(t, n) extern t VNET_NAME(n) 278 /* struct _hack is to stop this from being used with static data */ 279 #define VNET_DEFINE(t, n) \ 280 struct _hack; t VNET_NAME(n) __section(VNET_SETNAME) __used 281 #if defined(KLD_MODULE) && (defined(__aarch64__) || defined(__riscv) \ 282 || defined(__powerpc64__) || defined(__i386__)) 283 /* 284 * As with DPCPU_DEFINE_STATIC we are unable to mark this data as static 285 * in modules on some architectures. 286 */ 287 #define VNET_DEFINE_STATIC(t, n) \ 288 t VNET_NAME(n) __section(VNET_SETNAME) __used 289 #else 290 #define VNET_DEFINE_STATIC(t, n) \ 291 static t VNET_NAME(n) __section(VNET_SETNAME) __used 292 #endif 293 #define _VNET_PTR(b, n) (__typeof(VNET_NAME(n))*) \ 294 ((b) + (uintptr_t)&VNET_NAME(n)) 295 296 #define _VNET(b, n) (*_VNET_PTR(b, n)) 297 298 /* 299 * Virtualized global variable accessor macros. 300 */ 301 #define VNET_VNET_PTR(vnet, n) _VNET_PTR((vnet)->vnet_data_base, n) 302 #define VNET_VNET(vnet, n) (*VNET_VNET_PTR((vnet), n)) 303 304 #define VNET_PTR(n) VNET_VNET_PTR(curvnet, n) 305 #define VNET(n) VNET_VNET(curvnet, n) 306 307 /* 308 * Virtual network stack allocator interfaces from the kernel linker. 309 */ 310 void *vnet_data_alloc(int size); 311 void vnet_data_copy(void *start, int size); 312 void vnet_data_free(void *start_arg, int size); 313 314 /* 315 * Virtual sysinit mechanism, allowing network stack components to declare 316 * startup and shutdown methods to be run when virtual network stack 317 * instances are created and destroyed. 318 */ 319 #include <sys/kernel.h> 320 321 /* 322 * SYSINIT/SYSUNINIT variants that provide per-vnet constructors and 323 * destructors. 324 */ 325 struct vnet_sysinit { 326 enum sysinit_sub_id subsystem; 327 enum sysinit_elem_order order; 328 sysinit_cfunc_t func; 329 const void *arg; 330 TAILQ_ENTRY(vnet_sysinit) link; 331 }; 332 333 #define VNET_SYSINIT(ident, subsystem, order, func, arg) \ 334 CTASSERT((subsystem) > SI_SUB_VNET && \ 335 (subsystem) <= SI_SUB_VNET_DONE); \ 336 static struct vnet_sysinit ident ## _vnet_init = { \ 337 subsystem, \ 338 order, \ 339 (sysinit_cfunc_t)(sysinit_nfunc_t)func, \ 340 (arg) \ 341 }; \ 342 SYSINIT(vnet_init_ ## ident, subsystem, order, \ 343 vnet_register_sysinit, &ident ## _vnet_init); \ 344 SYSUNINIT(vnet_init_ ## ident, subsystem, order, \ 345 vnet_deregister_sysinit, &ident ## _vnet_init) 346 347 #define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \ 348 CTASSERT((subsystem) > SI_SUB_VNET && \ 349 (subsystem) <= SI_SUB_VNET_DONE); \ 350 static struct vnet_sysinit ident ## _vnet_uninit = { \ 351 subsystem, \ 352 order, \ 353 (sysinit_cfunc_t)(sysinit_nfunc_t)func, \ 354 (arg) \ 355 }; \ 356 SYSINIT(vnet_uninit_ ## ident, subsystem, order, \ 357 vnet_register_sysuninit, &ident ## _vnet_uninit); \ 358 SYSUNINIT(vnet_uninit_ ## ident, subsystem, order, \ 359 vnet_deregister_sysuninit, &ident ## _vnet_uninit) 360 361 /* 362 * Interfaces for managing per-vnet constructors and destructors. 363 */ 364 void vnet_register_sysinit(void *arg); 365 void vnet_register_sysuninit(void *arg); 366 void vnet_deregister_sysinit(void *arg); 367 void vnet_deregister_sysuninit(void *arg); 368 369 /* 370 * EVENTHANDLER(9) extensions. 371 */ 372 #include <sys/eventhandler.h> 373 374 void vnet_global_eventhandler_iterator_func(void *, ...); 375 #define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \ 376 do { \ 377 if (IS_DEFAULT_VNET(curvnet)) { \ 378 (tag) = vimage_eventhandler_register(NULL, #name, func, \ 379 arg, priority, \ 380 vnet_global_eventhandler_iterator_func); \ 381 } \ 382 } while(0) 383 #define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority) \ 384 do { \ 385 if (IS_DEFAULT_VNET(curvnet)) { \ 386 vimage_eventhandler_register(NULL, #name, func, \ 387 arg, priority, \ 388 vnet_global_eventhandler_iterator_func); \ 389 } \ 390 } while(0) 391 392 #else /* !VIMAGE */ 393 394 /* 395 * Various virtual network stack macros compile to no-ops without VIMAGE. 396 */ 397 #define curvnet NULL 398 399 #define VNET_ASSERT(exp, msg) 400 #define CURVNET_SET(arg) 401 #define CURVNET_SET_QUIET(arg) 402 #define CURVNET_RESTORE() 403 #define CURVNET_ASSERT_SET() \ 404 405 #define VNET_LIST_RLOCK() 406 #define VNET_LIST_RLOCK_NOSLEEP() 407 #define VNET_LIST_RUNLOCK() 408 #define VNET_LIST_RUNLOCK_NOSLEEP() 409 #define VNET_ITERATOR_DECL(arg) 410 #define VNET_FOREACH(arg) for (int _vn = 0; _vn == 0; _vn++) 411 412 #define IS_DEFAULT_VNET(arg) 1 413 #define CRED_TO_VNET(cr) NULL 414 #define TD_TO_VNET(td) NULL 415 #define P_TO_VNET(p) NULL 416 417 /* 418 * Versions of the VNET macros that compile to normal global variables and 419 * standard sysctl definitions. 420 */ 421 #define VNET_NAME(n) n 422 #define VNET_DECLARE(t, n) extern t n 423 #define VNET_DEFINE(t, n) struct _hack; t n 424 #define VNET_DEFINE_STATIC(t, n) static t n 425 #define _VNET_PTR(b, n) &VNET_NAME(n) 426 427 /* 428 * Virtualized global variable accessor macros. 429 */ 430 #define VNET_VNET_PTR(vnet, n) (&(n)) 431 #define VNET_VNET(vnet, n) (n) 432 433 #define VNET_PTR(n) (&(n)) 434 #define VNET(n) (n) 435 436 /* 437 * When VIMAGE isn't compiled into the kernel, VNET_SYSINIT/VNET_SYSUNINIT 438 * map into normal sysinits, which have the same ordering properties. 439 */ 440 #define VNET_SYSINIT(ident, subsystem, order, func, arg) \ 441 SYSINIT(ident, subsystem, order, func, arg) 442 #define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \ 443 SYSUNINIT(ident, subsystem, order, func, arg) 444 445 /* 446 * Without VIMAGE revert to the default implementation. 447 */ 448 #define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \ 449 (tag) = eventhandler_register(NULL, #name, func, arg, priority) 450 #define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority) \ 451 eventhandler_register(NULL, #name, func, arg, priority) 452 #endif /* VIMAGE */ 453 #endif /* _KERNEL */ 454 455 #endif /* !_NET_VNET_H_ */