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 * $FreeBSD$ 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 #ifdef VIMAGE 89 #include <sys/lock.h> 90 #include <sys/proc.h> /* for struct thread */ 91 #include <sys/rwlock.h> 92 #include <sys/sx.h> 93 94 /* 95 * Location of the kernel's 'set_vnet' linker set. 96 */ 97 extern uintptr_t *__start_set_vnet; 98 extern uintptr_t *__stop_set_vnet; 99 100 #define VNET_START (uintptr_t)&__start_set_vnet 101 #define VNET_STOP (uintptr_t)&__stop_set_vnet 102 103 /* 104 * Functions to allocate and destroy virtual network stacks. 105 */ 106 struct vnet *vnet_alloc(void); 107 void vnet_destroy(struct vnet *vnet); 108 109 /* 110 * The current virtual network stack -- we may wish to move this to struct 111 * pcpu in the future. 112 */ 113 #define curvnet curthread->td_vnet 114 115 /* 116 * Various macros -- get and set the current network stack, but also 117 * assertions. 118 */ 119 #ifdef VNET_DEBUG 120 void vnet_log_recursion(struct vnet *, const char *, int); 121 122 #define VNET_ASSERT(condition) \ 123 if (!(condition)) { \ 124 printf("VNET_ASSERT @ %s:%d %s():\n", \ 125 __FILE__, __LINE__, __FUNCTION__); \ 126 panic(#condition); \ 127 } 128 129 #define CURVNET_SET_QUIET(arg) \ 130 VNET_ASSERT((arg)->vnet_magic_n == VNET_MAGIC_N); \ 131 struct vnet *saved_vnet = curvnet; \ 132 const char *saved_vnet_lpush = curthread->td_vnet_lpush; \ 133 curvnet = arg; \ 134 curthread->td_vnet_lpush = __FUNCTION__; 135 136 #define CURVNET_SET_VERBOSE(arg) \ 137 CURVNET_SET_QUIET(arg) \ 138 if (saved_vnet) \ 139 vnet_log_recursion(saved_vnet, saved_vnet_lpush, __LINE__); 140 141 #define CURVNET_SET(arg) CURVNET_SET_VERBOSE(arg) 142 143 #define CURVNET_RESTORE() \ 144 VNET_ASSERT(saved_vnet == NULL || \ 145 saved_vnet->vnet_magic_n == VNET_MAGIC_N); \ 146 curvnet = saved_vnet; \ 147 curthread->td_vnet_lpush = saved_vnet_lpush; 148 #else /* !VNET_DEBUG */ 149 #define VNET_ASSERT(condition) 150 151 #define CURVNET_SET(arg) \ 152 struct vnet *saved_vnet = curvnet; \ 153 curvnet = arg; 154 155 #define CURVNET_SET_VERBOSE(arg) CURVNET_SET(arg) 156 #define CURVNET_SET_QUIET(arg) CURVNET_SET(arg) 157 158 #define CURVNET_RESTORE() \ 159 curvnet = saved_vnet; 160 #endif /* VNET_DEBUG */ 161 162 extern struct vnet *vnet0; 163 #define IS_DEFAULT_VNET(arg) ((arg) == vnet0) 164 165 #define CRED_TO_VNET(cr) (cr)->cr_prison->pr_vnet 166 #define TD_TO_VNET(td) CRED_TO_VNET((td)->td_ucred) 167 #define P_TO_VNET(p) CRED_TO_VNET((p)->p_ucred) 168 169 /* 170 * Global linked list of all virtual network stacks, along with read locks to 171 * access it. If a caller may sleep while accessing the list, it must use 172 * the sleepable lock macros. 173 */ 174 LIST_HEAD(vnet_list_head, vnet); 175 extern struct vnet_list_head vnet_head; 176 extern struct rwlock vnet_rwlock; 177 extern struct sx vnet_sxlock; 178 179 #define VNET_LIST_RLOCK() sx_slock(&vnet_sxlock) 180 #define VNET_LIST_RLOCK_NOSLEEP() rw_rlock(&vnet_rwlock) 181 #define VNET_LIST_RUNLOCK() sx_sunlock(&vnet_sxlock) 182 #define VNET_LIST_RUNLOCK_NOSLEEP() rw_runlock(&vnet_rwlock) 183 184 /* 185 * Iteration macros to walk the global list of virtual network stacks. 186 */ 187 #define VNET_ITERATOR_DECL(arg) struct vnet *arg 188 #define VNET_FOREACH(arg) LIST_FOREACH((arg), &vnet_head, vnet_le) 189 190 /* 191 * Virtual network stack memory allocator, which allows global variables to 192 * be automatically instantiated for each network stack instance. 193 */ 194 __asm__( 195 #if defined(__arm__) 196 ".section " VNET_SETNAME ", \"aw\", %progbits\n" 197 #else 198 ".section " VNET_SETNAME ", \"aw\", @progbits\n" 199 #endif 200 "\t.p2align " __XSTRING(CACHE_LINE_SHIFT) "\n" 201 "\t.previous"); 202 203 #define VNET_NAME(n) vnet_entry_##n 204 #define VNET_DECLARE(t, n) extern t VNET_NAME(n) 205 #define VNET_DEFINE(t, n) t VNET_NAME(n) __section(VNET_SETNAME) __used 206 #define _VNET_PTR(b, n) (__typeof(VNET_NAME(n))*) \ 207 ((b) + (uintptr_t)&VNET_NAME(n)) 208 209 #define _VNET(b, n) (*_VNET_PTR(b, n)) 210 211 /* 212 * Virtualized global variable accessor macros. 213 */ 214 #define VNET_VNET_PTR(vnet, n) _VNET_PTR((vnet)->vnet_data_base, n) 215 #define VNET_VNET(vnet, n) (*VNET_VNET_PTR((vnet), n)) 216 217 #define VNET_PTR(n) VNET_VNET_PTR(curvnet, n) 218 #define VNET(n) VNET_VNET(curvnet, n) 219 220 /* 221 * Virtual network stack allocator interfaces from the kernel linker. 222 */ 223 void *vnet_data_alloc(int size); 224 void vnet_data_copy(void *start, int size); 225 void vnet_data_free(void *start_arg, int size); 226 227 /* 228 * Sysctl variants for vnet-virtualized global variables. Include 229 * <sys/sysctl.h> to expose these definitions. 230 * 231 * Note: SYSCTL_PROC() handler functions will need to resolve pointer 232 * arguments themselves, if required. 233 */ 234 #ifdef SYSCTL_OID 235 int vnet_sysctl_handle_int(SYSCTL_HANDLER_ARGS); 236 int vnet_sysctl_handle_opaque(SYSCTL_HANDLER_ARGS); 237 int vnet_sysctl_handle_string(SYSCTL_HANDLER_ARGS); 238 int vnet_sysctl_handle_uint(SYSCTL_HANDLER_ARGS); 239 240 #define SYSCTL_VNET_INT(parent, nbr, name, access, ptr, val, descr) \ 241 SYSCTL_OID(parent, nbr, name, \ 242 CTLTYPE_INT|CTLFLAG_MPSAFE|CTLFLAG_VNET|(access), \ 243 ptr, val, vnet_sysctl_handle_int, "I", descr) 244 #define SYSCTL_VNET_PROC(parent, nbr, name, access, ptr, arg, handler, \ 245 fmt, descr) \ 246 SYSCTL_OID(parent, nbr, name, CTLFLAG_VNET|(access), ptr, arg, \ 247 handler, fmt, descr) 248 #define SYSCTL_VNET_STRING(parent, nbr, name, access, arg, len, descr) \ 249 SYSCTL_OID(parent, nbr, name, \ 250 CTLTYPE_STRING|CTLFLAG_VNET|(access), \ 251 arg, len, vnet_sysctl_handle_string, "A", descr) 252 #define SYSCTL_VNET_STRUCT(parent, nbr, name, access, ptr, type, descr) \ 253 SYSCTL_OID(parent, nbr, name, \ 254 CTLTYPE_OPAQUE|CTLFLAG_VNET|(access), ptr, \ 255 sizeof(struct type), vnet_sysctl_handle_opaque, "S," #type, \ 256 descr) 257 #define SYSCTL_VNET_UINT(parent, nbr, name, access, ptr, val, descr) \ 258 SYSCTL_OID(parent, nbr, name, \ 259 CTLTYPE_UINT|CTLFLAG_MPSAFE|CTLFLAG_VNET|(access), \ 260 ptr, val, vnet_sysctl_handle_uint, "IU", descr) 261 #define VNET_SYSCTL_ARG(req, arg1) do { \ 262 if (arg1 != NULL) \ 263 arg1 = (void *)(TD_TO_VNET((req)->td)->vnet_data_base + \ 264 (uintptr_t)(arg1)); \ 265 } while (0) 266 #endif /* SYSCTL_OID */ 267 268 /* 269 * Virtual sysinit mechanism, allowing network stack components to declare 270 * startup and shutdown methods to be run when virtual network stack 271 * instances are created and destroyed. 272 */ 273 #include <sys/kernel.h> 274 275 /* 276 * SYSINIT/SYSUNINIT variants that provide per-vnet constructors and 277 * destructors. 278 */ 279 struct vnet_sysinit { 280 enum sysinit_sub_id subsystem; 281 enum sysinit_elem_order order; 282 sysinit_cfunc_t func; 283 const void *arg; 284 TAILQ_ENTRY(vnet_sysinit) link; 285 }; 286 287 #define VNET_SYSINIT(ident, subsystem, order, func, arg) \ 288 static struct vnet_sysinit ident ## _vnet_init = { \ 289 subsystem, \ 290 order, \ 291 (sysinit_cfunc_t)(sysinit_nfunc_t)func, \ 292 (arg) \ 293 }; \ 294 SYSINIT(vnet_init_ ## ident, subsystem, order, \ 295 vnet_register_sysinit, &ident ## _vnet_init); \ 296 SYSUNINIT(vnet_init_ ## ident, subsystem, order, \ 297 vnet_deregister_sysinit, &ident ## _vnet_init) 298 299 #define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \ 300 static struct vnet_sysinit ident ## _vnet_uninit = { \ 301 subsystem, \ 302 order, \ 303 (sysinit_cfunc_t)(sysinit_nfunc_t)func, \ 304 (arg) \ 305 }; \ 306 SYSINIT(vnet_uninit_ ## ident, subsystem, order, \ 307 vnet_register_sysuninit, &ident ## _vnet_uninit); \ 308 SYSUNINIT(vnet_uninit_ ## ident, subsystem, order, \ 309 vnet_deregister_sysuninit, &ident ## _vnet_uninit) 310 311 /* 312 * Run per-vnet sysinits or sysuninits during vnet creation/destruction. 313 */ 314 void vnet_sysinit(void); 315 void vnet_sysuninit(void); 316 317 /* 318 * Interfaces for managing per-vnet constructors and destructors. 319 */ 320 void vnet_register_sysinit(void *arg); 321 void vnet_register_sysuninit(void *arg); 322 void vnet_deregister_sysinit(void *arg); 323 void vnet_deregister_sysuninit(void *arg); 324 325 /* 326 * EVENTHANDLER(9) extensions. 327 */ 328 #include <sys/eventhandler.h> 329 330 void vnet_global_eventhandler_iterator_func(void *, ...); 331 #define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \ 332 do { \ 333 if (IS_DEFAULT_VNET(curvnet)) { \ 334 (tag) = vimage_eventhandler_register(NULL, #name, func, \ 335 arg, priority, \ 336 vnet_global_eventhandler_iterator_func); \ 337 } \ 338 } while(0) 339 #define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority) \ 340 do { \ 341 if (IS_DEFAULT_VNET(curvnet)) { \ 342 vimage_eventhandler_register(NULL, #name, func, \ 343 arg, priority, \ 344 vnet_global_eventhandler_iterator_func); \ 345 } \ 346 } while(0) 347 348 #else /* !VIMAGE */ 349 350 /* 351 * Various virtual network stack macros compile to no-ops without VIMAGE. 352 */ 353 #define curvnet NULL 354 355 #define VNET_ASSERT(condition) 356 #define CURVNET_SET(arg) 357 #define CURVNET_SET_QUIET(arg) 358 #define CURVNET_RESTORE() 359 360 #define VNET_LIST_RLOCK() 361 #define VNET_LIST_RLOCK_NOSLEEP() 362 #define VNET_LIST_RUNLOCK() 363 #define VNET_LIST_RUNLOCK_NOSLEEP() 364 #define VNET_ITERATOR_DECL(arg) 365 #define VNET_FOREACH(arg) 366 367 #define IS_DEFAULT_VNET(arg) 1 368 #define CRED_TO_VNET(cr) NULL 369 #define TD_TO_VNET(td) NULL 370 #define P_TO_VNET(p) NULL 371 372 /* 373 * Versions of the VNET macros that compile to normal global variables and 374 * standard sysctl definitions. 375 */ 376 #define VNET_NAME(n) n 377 #define VNET_DECLARE(t, n) extern t n 378 #define VNET_DEFINE(t, n) t n 379 #define _VNET_PTR(b, n) &VNET_NAME(n) 380 381 /* 382 * Virtualized global variable accessor macros. 383 */ 384 #define VNET_VNET_PTR(vnet, n) (&(n)) 385 #define VNET_VNET(vnet, n) (n) 386 387 #define VNET_PTR(n) (&(n)) 388 #define VNET(n) (n) 389 390 /* 391 * When VIMAGE isn't compiled into the kernel, virtaulized SYSCTLs simply 392 * become normal SYSCTLs. 393 */ 394 #ifdef SYSCTL_OID 395 #define SYSCTL_VNET_INT(parent, nbr, name, access, ptr, val, descr) \ 396 SYSCTL_INT(parent, nbr, name, access, ptr, val, descr) 397 #define SYSCTL_VNET_PROC(parent, nbr, name, access, ptr, arg, handler, \ 398 fmt, descr) \ 399 SYSCTL_PROC(parent, nbr, name, access, ptr, arg, handler, fmt, \ 400 descr) 401 #define SYSCTL_VNET_STRING(parent, nbr, name, access, arg, len, descr) \ 402 SYSCTL_STRING(parent, nbr, name, access, arg, len, descr) 403 #define SYSCTL_VNET_STRUCT(parent, nbr, name, access, ptr, type, descr) \ 404 SYSCTL_STRUCT(parent, nbr, name, access, ptr, type, descr) 405 #define SYSCTL_VNET_UINT(parent, nbr, name, access, ptr, val, descr) \ 406 SYSCTL_UINT(parent, nbr, name, access, ptr, val, descr) 407 #define VNET_SYSCTL_ARG(req, arg1) 408 #endif /* SYSCTL_OID */ 409 410 /* 411 * When VIMAGE isn't compiled into the kernel, VNET_SYSINIT/VNET_SYSUNINIT 412 * map into normal sysinits, which have the same ordering properties. 413 */ 414 #define VNET_SYSINIT(ident, subsystem, order, func, arg) \ 415 SYSINIT(ident, subsystem, order, func, arg) 416 #define VNET_SYSUNINIT(ident, subsystem, order, func, arg) \ 417 SYSUNINIT(ident, subsystem, order, func, arg) 418 419 /* 420 * Without VIMAGE revert to the default implementation. 421 */ 422 #define VNET_GLOBAL_EVENTHANDLER_REGISTER_TAG(tag, name, func, arg, priority) \ 423 (tag) = eventhandler_register(NULL, #name, func, arg, priority) 424 #define VNET_GLOBAL_EVENTHANDLER_REGISTER(name, func, arg, priority) \ 425 eventhandler_register(NULL, #name, func, arg, priority) 426 #endif /* VIMAGE */ 427 #endif /* _KERNEL */ 428 429 #endif /* !_NET_VNET_H_ */ 430