1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 * $FreeBSD$ 38 */ 39 40 /*- 41 * This header file defines several sets of interfaces supporting virtualized 42 * network stacks: 43 * 44 * - Definition of 'struct vnet' and functions and macros to allocate/free/ 45 * manipulate it. 46 * 47 * - A virtual network stack memory allocator, which provides support for 48 * virtualized global variables via a special linker set, set_vnet. 49 * 50 * - Virtualized sysinits/sysuninits, which allow constructors and 51 * destructors to be run for each network stack subsystem as virtual 52 * instances are created and destroyed. 53 * 54 * If VIMAGE isn't compiled into the kernel, virtualized global variables 55 * compile to normal global variables, and virtualized sysinits to regular 56 * sysinits. 57 */ 58 59 #ifndef _NET_VNET_H_ 60 #define _NET_VNET_H_ 61 62 /* 63 * struct vnet describes a virtualized network stack, and is primarily a 64 * pointer to storage for virtualized global variables. Expose to userspace 65 * as required for libkvm. 66 */ 67 #if defined(_KERNEL) || defined(_WANT_VNET) 68 #include <sys/queue.h> 69 70 struct vnet { 71 LIST_ENTRY(vnet) vnet_le; /* all vnets list */ 72 u_int vnet_magic_n; 73 u_int vnet_ifcnt; 74 u_int vnet_sockcnt; 75 u_int vnet_state; /* SI_SUB_* */ 76 void *vnet_data_mem; 77 uintptr_t vnet_data_base; 78 }; 79 #define VNET_MAGIC_N 0x3e0d8f29 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, CTLFLAG_VNET | CTLTYPE_OPAQUE | CTLFLAG_RW, \ 145 NULL, 0, array ## _sysctl, "I", desc) 146 #endif /* SYSCTL_OID */ 147 148 #ifdef VIMAGE 149 #include <sys/lock.h> 150 #include <sys/proc.h> /* for struct thread */ 151 #include <sys/rwlock.h> 152 #include <sys/sx.h> 153 154 /* 155 * Location of the kernel's 'set_vnet' linker set. 156 */ 157 extern uintptr_t *__start_set_vnet; 158 __GLOBL(__start_set_vnet); 159 extern uintptr_t *__stop_set_vnet; 160 __GLOBL(__stop_set_vnet); 161 162 #define VNET_START (uintptr_t)&__start_set_vnet 163 #define VNET_STOP (uintptr_t)&__stop_set_vnet 164 165 /* 166 * Functions to allocate and destroy virtual network stacks. 167 */ 168 struct vnet *vnet_alloc(void); 169 void vnet_destroy(struct vnet *vnet); 170 171 /* 172 * The current virtual network stack -- we may wish to move this to struct 173 * pcpu in the future. 174 */ 175 #define curvnet curthread->td_vnet 176 177 /* 178 * Various macros -- get and set the current network stack, but also 179 * assertions. 180 */ 181 #if defined(INVARIANTS) || defined(VNET_DEBUG) 182 #define VNET_ASSERT(exp, msg) do { \ 183 if (!(exp)) \ 184 panic msg; \ 185 } while (0) 186 #else 187 #define VNET_ASSERT(exp, msg) do { \ 188 } while (0) 189 #endif 190 191 #ifdef VNET_DEBUG 192 void vnet_log_recursion(struct vnet *, const char *, int); 193 194 #define CURVNET_SET_QUIET(arg) \ 195 VNET_ASSERT((arg) != NULL && (arg)->vnet_magic_n == VNET_MAGIC_N, \ 196 ("CURVNET_SET at %s:%d %s() curvnet=%p vnet=%p", \ 197 __FILE__, __LINE__, __func__, curvnet, (arg))); \ 198 struct vnet *saved_vnet = curvnet; \ 199 const char *saved_vnet_lpush = curthread->td_vnet_lpush; \ 200 curvnet = arg; \ 201 curthread->td_vnet_lpush = __func__; 202 203 #define CURVNET_SET_VERBOSE(arg) \ 204 CURVNET_SET_QUIET(arg) \ 205 if (saved_vnet) \ 206 vnet_log_recursion(saved_vnet, saved_vnet_lpush, __LINE__); 207 208 #define CURVNET_SET(arg) CURVNET_SET_VERBOSE(arg) 209 210 #define CURVNET_RESTORE() \ 211 VNET_ASSERT(curvnet != NULL && (saved_vnet == NULL || \ 212 saved_vnet->vnet_magic_n == VNET_MAGIC_N), \ 213 ("CURVNET_RESTORE at %s:%d %s() curvnet=%p saved_vnet=%p", \ 214 __FILE__, __LINE__, __func__, curvnet, saved_vnet)); \ 215 curvnet = saved_vnet; \ 216 curthread->td_vnet_lpush = saved_vnet_lpush; 217 #else /* !VNET_DEBUG */ 218 219 #define CURVNET_SET_QUIET(arg) \ 220 VNET_ASSERT((arg) != NULL && (arg)->vnet_magic_n == VNET_MAGIC_N, \ 221 ("CURVNET_SET at %s:%d %s() curvnet=%p vnet=%p", \ 222 __FILE__, __LINE__, __func__, curvnet, (arg))); \ 223 struct vnet *saved_vnet = curvnet; \ 224 curvnet = arg; 225 226 #define CURVNET_SET_VERBOSE(arg) \ 227 CURVNET_SET_QUIET(arg) 228 229 #define CURVNET_SET(arg) CURVNET_SET_VERBOSE(arg) 230 231 #define CURVNET_RESTORE() \ 232 VNET_ASSERT(curvnet != NULL && (saved_vnet == NULL || \ 233 saved_vnet->vnet_magic_n == VNET_MAGIC_N), \ 234 ("CURVNET_RESTORE at %s:%d %s() curvnet=%p saved_vnet=%p", \ 235 __FILE__, __LINE__, __func__, curvnet, saved_vnet)); \ 236 curvnet = saved_vnet; 237 #endif /* VNET_DEBUG */ 238 239 extern struct vnet *vnet0; 240 #define IS_DEFAULT_VNET(arg) ((arg) == vnet0) 241 242 #define CRED_TO_VNET(cr) (cr)->cr_prison->pr_vnet 243 #define TD_TO_VNET(td) CRED_TO_VNET((td)->td_ucred) 244 #define P_TO_VNET(p) CRED_TO_VNET((p)->p_ucred) 245 246 /* 247 * Global linked list of all virtual network stacks, along with read locks to 248 * access it. If a caller may sleep while accessing the list, it must use 249 * the sleepable lock macros. 250 */ 251 LIST_HEAD(vnet_list_head, vnet); 252 extern struct vnet_list_head vnet_head; 253 extern struct rwlock vnet_rwlock; 254 extern struct sx vnet_sxlock; 255 256 #define VNET_LIST_RLOCK() sx_slock(&vnet_sxlock) 257 #define VNET_LIST_RLOCK_NOSLEEP() rw_rlock(&vnet_rwlock) 258 #define VNET_LIST_RUNLOCK() sx_sunlock(&vnet_sxlock) 259 #define VNET_LIST_RUNLOCK_NOSLEEP() rw_runlock(&vnet_rwlock) 260 261 /* 262 * Iteration macros to walk the global list of virtual network stacks. 263 */ 264 #define VNET_ITERATOR_DECL(arg) struct vnet *arg 265 #define VNET_FOREACH(arg) LIST_FOREACH((arg), &vnet_head, vnet_le) 266 267 /* 268 * Virtual network stack memory allocator, which allows global variables to 269 * be automatically instantiated for each network stack instance. 270 */ 271 #define VNET_NAME(n) vnet_entry_##n 272 #define VNET_DECLARE(t, n) extern t VNET_NAME(n) 273 /* struct _hack is to stop this from being used with static data */ 274 #define VNET_DEFINE(t, n) \ 275 struct _hack; t VNET_NAME(n) __section(VNET_SETNAME) __used 276 #if defined(KLD_MODULE) && (defined(__aarch64__) || defined(__riscv)) 277 /* 278 * As with DPCPU_DEFINE_STATIC we are unable to mark this data as static 279 * in modules on some architectures. 280 */ 281 #define VNET_DEFINE_STATIC(t, n) \ 282 t VNET_NAME(n) __section(VNET_SETNAME) __used 283 #else 284 #define VNET_DEFINE_STATIC(t, n) \ 285 static t VNET_NAME(n) __section(VNET_SETNAME) __used 286 #endif 287 #define _VNET_PTR(b, n) (__typeof(VNET_NAME(n))*) \ 288 ((b) + (uintptr_t)&VNET_NAME(n)) 289 290 #define _VNET(b, n) (*_VNET_PTR(b, n)) 291 292 /* 293 * Virtualized global variable accessor macros. 294 */ 295 #define VNET_VNET_PTR(vnet, n) _VNET_PTR((vnet)->vnet_data_base, n) 296 #define VNET_VNET(vnet, n) (*VNET_VNET_PTR((vnet), n)) 297 298 #define VNET_PTR(n) VNET_VNET_PTR(curvnet, n) 299 #define VNET(n) VNET_VNET(curvnet, n) 300 301 /* 302 * Virtual network stack allocator interfaces from the kernel linker. 303 */ 304 void *vnet_data_alloc(int size); 305 void vnet_data_copy(void *start, int size); 306 void vnet_data_free(void *start_arg, int size); 307 308 /* 309 * Virtual sysinit mechanism, allowing network stack components to declare 310 * startup and shutdown methods to be run when virtual network stack 311 * instances are created and destroyed. 312 */ 313 #include <sys/kernel.h> 314 315 /* 316 * SYSINIT/SYSUNINIT variants that provide per-vnet constructors and 317 * destructors. 318 */ 319 struct vnet_sysinit { 320 enum sysinit_sub_id subsystem; 321 enum sysinit_elem_order order; 322 sysinit_cfunc_t func; 323 const void *arg; 324 TAILQ_ENTRY(vnet_sysinit) link; 325 }; 326 327 #define VNET_SYSINIT(ident, subsystem, order, func, arg) \ 328 static struct vnet_sysinit ident ## _vnet_init = { \ 329 subsystem, \ 330 order, \ 331 (sysinit_cfunc_t)(sysinit_nfunc_t)func, \ 332 (arg) \ 333 }; \ 334 SYSINIT(vnet_init_ ## ident, subsystem, order, \ 335 vnet_register_sysinit, &ident ## _vnet_init); \ 336 SYSUNINIT(vnet_init_ ## ident, subsystem, order, \ 337 vnet_deregister_sysinit, &ident ## _vnet_init) 338 339 #define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \ 340 static struct vnet_sysinit ident ## _vnet_uninit = { \ 341 subsystem, \ 342 order, \ 343 (sysinit_cfunc_t)(sysinit_nfunc_t)func, \ 344 (arg) \ 345 }; \ 346 SYSINIT(vnet_uninit_ ## ident, subsystem, order, \ 347 vnet_register_sysuninit, &ident ## _vnet_uninit); \ 348 SYSUNINIT(vnet_uninit_ ## ident, subsystem, order, \ 349 vnet_deregister_sysuninit, &ident ## _vnet_uninit) 350 351 /* 352 * Run per-vnet sysinits or sysuninits during vnet creation/destruction. 353 */ 354 void vnet_sysinit(void); 355 void vnet_sysuninit(void); 356 357 /* 358 * Interfaces for managing per-vnet constructors and destructors. 359 */ 360 void vnet_register_sysinit(void *arg); 361 void vnet_register_sysuninit(void *arg); 362 void vnet_deregister_sysinit(void *arg); 363 void vnet_deregister_sysuninit(void *arg); 364 365 /* 366 * EVENTHANDLER(9) extensions. 367 */ 368 #include <sys/eventhandler.h> 369 370 void vnet_global_eventhandler_iterator_func(void *, ...); 371 #define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \ 372 do { \ 373 if (IS_DEFAULT_VNET(curvnet)) { \ 374 (tag) = vimage_eventhandler_register(NULL, #name, func, \ 375 arg, priority, \ 376 vnet_global_eventhandler_iterator_func); \ 377 } \ 378 } while(0) 379 #define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority) \ 380 do { \ 381 if (IS_DEFAULT_VNET(curvnet)) { \ 382 vimage_eventhandler_register(NULL, #name, func, \ 383 arg, priority, \ 384 vnet_global_eventhandler_iterator_func); \ 385 } \ 386 } while(0) 387 388 #else /* !VIMAGE */ 389 390 /* 391 * Various virtual network stack macros compile to no-ops without VIMAGE. 392 */ 393 #define curvnet NULL 394 395 #define VNET_ASSERT(exp, msg) 396 #define CURVNET_SET(arg) 397 #define CURVNET_SET_QUIET(arg) 398 #define CURVNET_RESTORE() 399 400 #define VNET_LIST_RLOCK() 401 #define VNET_LIST_RLOCK_NOSLEEP() 402 #define VNET_LIST_RUNLOCK() 403 #define VNET_LIST_RUNLOCK_NOSLEEP() 404 #define VNET_ITERATOR_DECL(arg) 405 #define VNET_FOREACH(arg) 406 407 #define IS_DEFAULT_VNET(arg) 1 408 #define CRED_TO_VNET(cr) NULL 409 #define TD_TO_VNET(td) NULL 410 #define P_TO_VNET(p) NULL 411 412 /* 413 * Versions of the VNET macros that compile to normal global variables and 414 * standard sysctl definitions. 415 */ 416 #define VNET_NAME(n) n 417 #define VNET_DECLARE(t, n) extern t n 418 #define VNET_DEFINE(t, n) struct _hack; t n 419 #define VNET_DEFINE_STATIC(t, n) static t n 420 #define _VNET_PTR(b, n) &VNET_NAME(n) 421 422 /* 423 * Virtualized global variable accessor macros. 424 */ 425 #define VNET_VNET_PTR(vnet, n) (&(n)) 426 #define VNET_VNET(vnet, n) (n) 427 428 #define VNET_PTR(n) (&(n)) 429 #define VNET(n) (n) 430 431 /* 432 * When VIMAGE isn't compiled into the kernel, VNET_SYSINIT/VNET_SYSUNINIT 433 * map into normal sysinits, which have the same ordering properties. 434 */ 435 #define VNET_SYSINIT(ident, subsystem, order, func, arg) \ 436 SYSINIT(ident, subsystem, order, func, arg) 437 #define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \ 438 SYSUNINIT(ident, subsystem, order, func, arg) 439 440 /* 441 * Without VIMAGE revert to the default implementation. 442 */ 443 #define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \ 444 (tag) = eventhandler_register(NULL, #name, func, arg, priority) 445 #define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority) \ 446 eventhandler_register(NULL, #name, func, arg, priority) 447 #endif /* VIMAGE */ 448 #endif /* _KERNEL */ 449 450 #endif /* !_NET_VNET_H_ */ 451