Cross Reference: /freebsd-11.0-release/sys/net/vnet.c

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vnet.c (215317)	vnet.c (215701)
1/- 2 Copyright (c) 2004-2009 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 36#include <sys/cdefs.h>	1/- 2 Copyright (c) 2004-2009 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 36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: head/sys/net/vnet.c 215317 2010-11-14 20:38:11Z dim $");	37__FBSDID("$FreeBSD: head/sys/net/vnet.c 215701 2010-11-22 19:32:54Z dim $");
38 39#include "opt_ddb.h" 40#include "opt_kdb.h" 41#include "opt_kdtrace.h" 42 43#include <sys/param.h> 44#include <sys/kdb.h> 45#include <sys/kernel.h> 46#include <sys/jail.h> 47#include <sys/sdt.h> 48#include <sys/systm.h> 49#include <sys/sysctl.h> 50#include <sys/eventhandler.h> 51#include <sys/linker_set.h> 52#include <sys/lock.h> 53#include <sys/malloc.h> 54#include <sys/proc.h> 55#include <sys/socket.h> 56#include <sys/sx.h> 57#include <sys/sysctl.h> 58 59#include <machine/stdarg.h> 60 61#ifdef DDB 62#include <ddb/ddb.h> 63#include <ddb/db_sym.h> 64#endif 65 66#include <net/if.h> 67#include <net/if_var.h> 68#include <net/vnet.h> 69 70/- 71 This file implements core functions for virtual network stacks: 72 * 73 * - Virtual network stack management functions. 74 * 75 * - Virtual network stack memory allocator, which virtualizes global 76 * variables in the network stack 77 * 78 * - Virtualized SYSINIT's/SYSUNINIT's, which allow network stack subsystems 79 * to register startup/shutdown events to be run for each virtual network 80 * stack instance. 81 / 82 83MALLOC_DEFINE(M_VNET, "vnet", "network stack control block"); 84 85/ 86 * The virtual network stack list has two read-write locks, one sleepable and 87 * the other not, so that the list can be stablized and walked in a variety 88 * of network stack contexts. Both must be acquired exclusively to modify 89 * the list, but a read lock of either lock is sufficient to walk the list. 90 / 91struct rwlock vnet_rwlock; 92struct sx vnet_sxlock; 93 94#define VNET_LIST_WLOCK() do { \ 95 sx_xlock(&vnet_sxlock); \ 96 rw_wlock(&vnet_rwlock); \ 97} while (0) 98 99#define VNET_LIST_WUNLOCK() do { \ 100* rw_wunlock(&vnet_rwlock); \ 101 sx_xunlock(&vnet_sxlock); \ 102} while (0) 103 104struct vnet_list_head vnet_head; 105struct vnet vnet0; 106* 107/* 108 * The virtual network stack allocator provides storage for virtualized 109 * global variables. These variables are defined/declared using the 110 * VNET_DEFINE()/VNET_DECLARE() macros, which place them in the 'set_vnet' 111 * linker set. The details of the implementation are somewhat subtle, but 112 * allow the majority of most network subsystems to maintain 113 * virtualization-agnostic. 114 * 115 * The virtual network stack allocator handles variables in the base kernel 116 * vs. modules in similar but different ways. In both cases, virtualized 117 * global variables are marked as such by being declared to be part of the 118 * vnet linker set. These "master" copies of global variables serve two 119 * functions: 120 * 121 * (1) They contain static initialization or "default" values for global 122 * variables which will be propagated to each virtual network stack 123 * instance when created. As with normal global variables, they default 124 * to zero-filled. 125 * 126 * (2) They act as unique global names by which the variable can be referred 127 * to, regardless of network stack instance. The single global symbol 128 * will be used to calculate the location of a per-virtual instance 129 * variable at run-time. 130 * 131 * Each virtual network stack instance has a complete copy of each 132 * virtualized global variable, stored in a malloc'd block of memory 133 * referred to by vnet->vnet_data_mem. Critical to the design is that each 134 * per-instance memory block is laid out identically to the master block so 135 * that the offset of each global variable is the same across all blocks. To 136 * optimize run-time access, a precalculated 'base' address, 137 * vnet->vnet_data_base, is stored in each vnet, and is the amount that can 138 * be added to the address of a 'master' instance of a variable to get to the 139 * per-vnet instance. 140 * 141 * Virtualized global variables are handled in a similar manner, but as each 142 * module has its own 'set_vnet' linker set, and we want to keep all 143 * virtualized globals togther, we reserve space in the kernel's linker set 144 * for potential module variables using a per-vnet character array, 145 * 'modspace'. The virtual network stack allocator maintains a free list to 146 * track what space in the array is free (all, initially) and as modules are 147 * linked, allocates portions of the space to specific globals. The kernel 148 * module linker queries the virtual network stack allocator and will 149 * bind references of the global to the location during linking. It also 150 * calls into the virtual network stack allocator, once the memory is 151 * initialized, in order to propagate the new static initializations to all 152 * existing virtual network stack instances so that the soon-to-be executing 153 * module will find every network stack instance with proper default values. 154 / 155* 156/* 157 * Number of bytes of data in the 'set_vnet' linker set, and hence the total 158 * size of all kernel virtualized global variables, and the malloc(9) type 159 * that will be used to allocate it. 160 / 161#define VNET_BYTES (VNET_STOP - VNET_START) 162* 163MALLOC_DEFINE(M_VNET_DATA, "vnet_data", "VNET data"); 164 165/* 166 * VNET_MODMIN is the minimum number of bytes we will reserve for the sum of 167 * global variables across all loaded modules. As this actually sizes an 168 * array declared as a virtualized global variable in the kernel itself, and 169 * we want the virtualized global variable space to be page-sized, we may 170 * have more space than that in practice. 171 / 172#define VNET_MODMIN 8192 173#define VNET_SIZE roundup2(VNET_BYTES, PAGE_SIZE) 174#define VNET_MODSIZE (VNET_SIZE - (VNET_BYTES - VNET_MODMIN)) 175* 176/* 177 * Space to store virtualized global variables from loadable kernel modules, 178 * and the free list to manage it. 179 */	38 39#include "opt_ddb.h" 40#include "opt_kdb.h" 41#include "opt_kdtrace.h" 42 43#include <sys/param.h> 44#include <sys/kdb.h> 45#include <sys/kernel.h> 46#include <sys/jail.h> 47#include <sys/sdt.h> 48#include <sys/systm.h> 49#include <sys/sysctl.h> 50#include <sys/eventhandler.h> 51#include <sys/linker_set.h> 52#include <sys/lock.h> 53#include <sys/malloc.h> 54#include <sys/proc.h> 55#include <sys/socket.h> 56#include <sys/sx.h> 57#include <sys/sysctl.h> 58 59#include <machine/stdarg.h> 60 61#ifdef DDB 62#include <ddb/ddb.h> 63#include <ddb/db_sym.h> 64#endif 65 66#include <net/if.h> 67#include <net/if_var.h> 68#include <net/vnet.h> 69 70/- 71 This file implements core functions for virtual network stacks: 72 * 73 * - Virtual network stack management functions. 74 * 75 * - Virtual network stack memory allocator, which virtualizes global 76 * variables in the network stack 77 * 78 * - Virtualized SYSINIT's/SYSUNINIT's, which allow network stack subsystems 79 * to register startup/shutdown events to be run for each virtual network 80 * stack instance. 81 / 82 83MALLOC_DEFINE(M_VNET, "vnet", "network stack control block"); 84 85/ 86 * The virtual network stack list has two read-write locks, one sleepable and 87 * the other not, so that the list can be stablized and walked in a variety 88 * of network stack contexts. Both must be acquired exclusively to modify 89 * the list, but a read lock of either lock is sufficient to walk the list. 90 / 91struct rwlock vnet_rwlock; 92struct sx vnet_sxlock; 93 94#define VNET_LIST_WLOCK() do { \ 95 sx_xlock(&vnet_sxlock); \ 96 rw_wlock(&vnet_rwlock); \ 97} while (0) 98 99#define VNET_LIST_WUNLOCK() do { \ 100* rw_wunlock(&vnet_rwlock); \ 101 sx_xunlock(&vnet_sxlock); \ 102} while (0) 103 104struct vnet_list_head vnet_head; 105struct vnet vnet0; 106* 107/* 108 * The virtual network stack allocator provides storage for virtualized 109 * global variables. These variables are defined/declared using the 110 * VNET_DEFINE()/VNET_DECLARE() macros, which place them in the 'set_vnet' 111 * linker set. The details of the implementation are somewhat subtle, but 112 * allow the majority of most network subsystems to maintain 113 * virtualization-agnostic. 114 * 115 * The virtual network stack allocator handles variables in the base kernel 116 * vs. modules in similar but different ways. In both cases, virtualized 117 * global variables are marked as such by being declared to be part of the 118 * vnet linker set. These "master" copies of global variables serve two 119 * functions: 120 * 121 * (1) They contain static initialization or "default" values for global 122 * variables which will be propagated to each virtual network stack 123 * instance when created. As with normal global variables, they default 124 * to zero-filled. 125 * 126 * (2) They act as unique global names by which the variable can be referred 127 * to, regardless of network stack instance. The single global symbol 128 * will be used to calculate the location of a per-virtual instance 129 * variable at run-time. 130 * 131 * Each virtual network stack instance has a complete copy of each 132 * virtualized global variable, stored in a malloc'd block of memory 133 * referred to by vnet->vnet_data_mem. Critical to the design is that each 134 * per-instance memory block is laid out identically to the master block so 135 * that the offset of each global variable is the same across all blocks. To 136 * optimize run-time access, a precalculated 'base' address, 137 * vnet->vnet_data_base, is stored in each vnet, and is the amount that can 138 * be added to the address of a 'master' instance of a variable to get to the 139 * per-vnet instance. 140 * 141 * Virtualized global variables are handled in a similar manner, but as each 142 * module has its own 'set_vnet' linker set, and we want to keep all 143 * virtualized globals togther, we reserve space in the kernel's linker set 144 * for potential module variables using a per-vnet character array, 145 * 'modspace'. The virtual network stack allocator maintains a free list to 146 * track what space in the array is free (all, initially) and as modules are 147 * linked, allocates portions of the space to specific globals. The kernel 148 * module linker queries the virtual network stack allocator and will 149 * bind references of the global to the location during linking. It also 150 * calls into the virtual network stack allocator, once the memory is 151 * initialized, in order to propagate the new static initializations to all 152 * existing virtual network stack instances so that the soon-to-be executing 153 * module will find every network stack instance with proper default values. 154 / 155* 156/* 157 * Number of bytes of data in the 'set_vnet' linker set, and hence the total 158 * size of all kernel virtualized global variables, and the malloc(9) type 159 * that will be used to allocate it. 160 / 161#define VNET_BYTES (VNET_STOP - VNET_START) 162* 163MALLOC_DEFINE(M_VNET_DATA, "vnet_data", "VNET data"); 164 165/* 166 * VNET_MODMIN is the minimum number of bytes we will reserve for the sum of 167 * global variables across all loaded modules. As this actually sizes an 168 * array declared as a virtualized global variable in the kernel itself, and 169 * we want the virtualized global variable space to be page-sized, we may 170 * have more space than that in practice. 171 / 172#define VNET_MODMIN 8192 173#define VNET_SIZE roundup2(VNET_BYTES, PAGE_SIZE) 174#define VNET_MODSIZE (VNET_SIZE - (VNET_BYTES - VNET_MODMIN)) 175* 176/* 177 * Space to store virtualized global variables from loadable kernel modules, 178 * and the free list to manage it. 179 */
180STATIC_VNET_DEFINE(char, modspace[VNET_MODMIN]);	180static VNET_DEFINE(char, modspace[VNET_MODMIN]);
181 182/* 183 * Global lists of subsystem constructor and destructors for vnets. They are 184 * registered via VNET_SYSINIT() and VNET_SYSUNINIT(). Both lists are 185 * protected by the vnet_sysinit_sxlock global lock. 186 / 187static TAILQ_HEAD(vnet_sysinit_head, vnet_sysinit) vnet_constructors = 188* TAILQ_HEAD_INITIALIZER(vnet_constructors); 189static TAILQ_HEAD(vnet_sysuninit_head, vnet_sysinit) vnet_destructors = 190 TAILQ_HEAD_INITIALIZER(vnet_destructors); 191 192struct sx vnet_sysinit_sxlock; 193 194#define VNET_SYSINIT_WLOCK() sx_xlock(&vnet_sysinit_sxlock); 195#define VNET_SYSINIT_WUNLOCK() sx_xunlock(&vnet_sysinit_sxlock); 196#define VNET_SYSINIT_RLOCK() sx_slock(&vnet_sysinit_sxlock); 197#define VNET_SYSINIT_RUNLOCK() sx_sunlock(&vnet_sysinit_sxlock); 198 199struct vnet_data_free { 200 uintptr_t vnd_start; 201 int vnd_len; 202 TAILQ_ENTRY(vnet_data_free) vnd_link; 203}; 204 205MALLOC_DEFINE(M_VNET_DATA_FREE, "vnet_data_free", "VNET resource accounting"); 206static TAILQ_HEAD(, vnet_data_free) vnet_data_free_head = 207 TAILQ_HEAD_INITIALIZER(vnet_data_free_head); 208static struct sx vnet_data_free_lock; 209 210SDT_PROVIDER_DEFINE(vnet); 211SDT_PROBE_DEFINE1(vnet, functions, vnet_alloc, entry, entry, "int"); 212SDT_PROBE_DEFINE2(vnet, functions, vnet_alloc, alloc, alloc, "int", 213 "struct vnet "); 214SDT_PROBE_DEFINE2(vnet, functions, vnet_alloc, return, return, 215* "int", "struct vnet "); 216SDT_PROBE_DEFINE2(vnet, functions, vnet_destroy, entry, entry, 217* "int", "struct vnet "); 218SDT_PROBE_DEFINE1(vnet, functions, vnet_destroy, return, entry, 219* "int"); 220 221#ifdef DDB 222static void db_show_vnet_print_vs(struct vnet_sysinit , int); 223#endif 224* 225/* 226 * Allocate a virtual network stack. 227 / 228struct vnet 229vnet_alloc(void) 230{ 231 struct vnet vnet; 232* 233 SDT_PROBE1(vnet, functions, vnet_alloc, entry, __LINE__); 234 vnet = malloc(sizeof(struct vnet), M_VNET, M_WAITOK \| M_ZERO); 235 vnet->vnet_magic_n = VNET_MAGIC_N; 236 SDT_PROBE2(vnet, functions, vnet_alloc, alloc, __LINE__, vnet); 237 238 /* 239 * Allocate storage for virtualized global variables and copy in 240 * initial values form our 'master' copy. 241 / 242* vnet->vnet_data_mem = malloc(VNET_SIZE, M_VNET_DATA, M_WAITOK); 243 memcpy(vnet->vnet_data_mem, (void )VNET_START, VNET_BYTES); 244* 245 /* 246 * All use of vnet-specific data will immediately subtract VNET_START 247 * from the base memory pointer, so pre-calculate that now to avoid 248 * it on each use. 249 / 250* vnet->vnet_data_base = (uintptr_t)vnet->vnet_data_mem - VNET_START; 251 252 /* Initialize / attach vnet module instances. / 253* CURVNET_SET_QUIET(vnet); 254 vnet_sysinit(); 255 CURVNET_RESTORE(); 256 257 VNET_LIST_WLOCK(); 258 LIST_INSERT_HEAD(&vnet_head, vnet, vnet_le); 259 VNET_LIST_WUNLOCK(); 260 261 SDT_PROBE2(vnet, functions, vnet_alloc, return, __LINE__, vnet); 262 return (vnet); 263} 264 265/* 266 * Destroy a virtual network stack. 267 / 268void 269vnet_destroy(struct vnet vnet) 270{ 271 struct ifnet ifp, nifp; 272 273 SDT_PROBE2(vnet, functions, vnet_destroy, entry, __LINE__, vnet); 274 KASSERT(vnet->vnet_sockcnt == 0, 275 ("%s: vnet still has sockets", __func__)); 276 277 VNET_LIST_WLOCK(); 278 LIST_REMOVE(vnet, vnet_le); 279 VNET_LIST_WUNLOCK(); 280 281 CURVNET_SET_QUIET(vnet); 282 283 /* Return all inherited interfaces to their parent vnets. / 284* TAILQ_FOREACH_SAFE(ifp, &V_ifnet, if_link, nifp) { 285 if (ifp->if_home_vnet != ifp->if_vnet) 286 if_vmove(ifp, ifp->if_home_vnet); 287 } 288 289 vnet_sysuninit(); 290 CURVNET_RESTORE(); 291 292 /* 293 * Release storage for the virtual network stack instance. 294 / 295* free(vnet->vnet_data_mem, M_VNET_DATA); 296 vnet->vnet_data_mem = NULL; 297 vnet->vnet_data_base = 0; 298 vnet->vnet_magic_n = 0xdeadbeef; 299 free(vnet, M_VNET); 300 SDT_PROBE1(vnet, functions, vnet_destroy, return, __LINE__); 301} 302 303/* 304 * Boot time initialization and allocation of virtual network stacks. 305 / 306static void 307vnet_init_prelink(void arg) 308{ 309 310 rw_init(&vnet_rwlock, "vnet_rwlock"); 311 sx_init(&vnet_sxlock, "vnet_sxlock"); 312 sx_init(&vnet_sysinit_sxlock, "vnet_sysinit_sxlock"); 313 LIST_INIT(&vnet_head); 314} 315SYSINIT(vnet_init_prelink, SI_SUB_VNET_PRELINK, SI_ORDER_FIRST, 316 vnet_init_prelink, NULL); 317 318static void 319vnet0_init(void arg) 320{ 321* 322 /* Warn people before take off - in case we crash early. / 323* printf("WARNING: VIMAGE (virtualized network stack) is a highly " 324 "experimental feature.\n"); 325 326 /* 327 * We MUST clear curvnet in vi_init_done() before going SMP, 328 * otherwise CURVNET_SET() macros would scream about unnecessary 329 * curvnet recursions. 330 / 331* curvnet = prison0.pr_vnet = vnet0 = vnet_alloc(); 332} 333SYSINIT(vnet0_init, SI_SUB_VNET, SI_ORDER_FIRST, vnet0_init, NULL); 334 335static void 336vnet_init_done(void unused) 337{ 338* 339 curvnet = NULL; 340} 341 342SYSINIT(vnet_init_done, SI_SUB_VNET_DONE, SI_ORDER_FIRST, vnet_init_done, 343 NULL); 344 345/* 346 * Once on boot, initialize the modspace freelist to entirely cover modspace. 347 / 348static void 349vnet_data_startup(void dummy __unused) 350{ 351 struct vnet_data_free df; 352* 353 df = malloc(sizeof(df), M_VNET_DATA_FREE, M_WAITOK \| M_ZERO); 354* df->vnd_start = (uintptr_t)&VNET_NAME(modspace); 355 df->vnd_len = VNET_MODMIN; 356 TAILQ_INSERT_HEAD(&vnet_data_free_head, df, vnd_link); 357 sx_init(&vnet_data_free_lock, "vnet_data alloc lock"); 358} 359SYSINIT(vnet_data, SI_SUB_KLD, SI_ORDER_FIRST, vnet_data_startup, 0); 360 361/* 362 * When a module is loaded and requires storage for a virtualized global 363 * variable, allocate space from the modspace free list. This interface 364 * should be used only by the kernel linker. 365 / 366void 367vnet_data_alloc(int size) 368{ 369 struct vnet_data_free df; 370* void s; 371* 372 s = NULL; 373 size = roundup2(size, sizeof(void )); 374* sx_xlock(&vnet_data_free_lock); 375 TAILQ_FOREACH(df, &vnet_data_free_head, vnd_link) { 376 if (df->vnd_len < size) 377 continue; 378 if (df->vnd_len == size) { 379 s = (void )df->vnd_start; 380* TAILQ_REMOVE(&vnet_data_free_head, df, vnd_link); 381 free(df, M_VNET_DATA_FREE); 382 break; 383 } 384 s = (void )df->vnd_start; 385* df->vnd_len -= size; 386 df->vnd_start = df->vnd_start + size; 387 break; 388 } 389 sx_xunlock(&vnet_data_free_lock); 390 391 return (s); 392} 393 394/* 395 * Free space for a virtualized global variable on module unload. 396 / 397void 398vnet_data_free(void start_arg, int size) 399{ 400 struct vnet_data_free df; 401* struct vnet_data_free dn; 402* uintptr_t start; 403 uintptr_t end; 404 405 size = roundup2(size, sizeof(void )); 406* start = (uintptr_t)start_arg; 407 end = start + size; 408 /* 409 * Free a region of space and merge it with as many neighbors as 410 * possible. Keeping the list sorted simplifies this operation. 411 / 412* sx_xlock(&vnet_data_free_lock); 413 TAILQ_FOREACH(df, &vnet_data_free_head, vnd_link) { 414 if (df->vnd_start > end) 415 break; 416 /* 417 * If we expand at the end of an entry we may have to merge 418 * it with the one following it as well. 419 / 420* if (df->vnd_start + df->vnd_len == start) { 421 df->vnd_len += size; 422 dn = TAILQ_NEXT(df, vnd_link); 423 if (df->vnd_start + df->vnd_len == dn->vnd_start) { 424 df->vnd_len += dn->vnd_len; 425 TAILQ_REMOVE(&vnet_data_free_head, dn, 426 vnd_link); 427 free(dn, M_VNET_DATA_FREE); 428 } 429 sx_xunlock(&vnet_data_free_lock); 430 return; 431 } 432 if (df->vnd_start == end) { 433 df->vnd_start = start; 434 df->vnd_len += size; 435 sx_xunlock(&vnet_data_free_lock); 436 return; 437 } 438 } 439 dn = malloc(sizeof(df), M_VNET_DATA_FREE, M_WAITOK \| M_ZERO); 440* dn->vnd_start = start; 441 dn->vnd_len = size; 442 if (df) 443 TAILQ_INSERT_BEFORE(df, dn, vnd_link); 444 else 445 TAILQ_INSERT_TAIL(&vnet_data_free_head, dn, vnd_link); 446 sx_xunlock(&vnet_data_free_lock); 447} 448 449/* 450 * When a new virtualized global variable has been allocated, propagate its 451 * initial value to each already-allocated virtual network stack instance. 452 / 453void 454vnet_data_copy(void start, int size) 455{ 456 struct vnet vnet; 457* 458 VNET_LIST_RLOCK(); 459 LIST_FOREACH(vnet, &vnet_head, vnet_le) 460 memcpy((void )((uintptr_t)vnet->vnet_data_base + 461* (uintptr_t)start), start, size); 462 VNET_LIST_RUNLOCK(); 463} 464 465/* 466 * Variants on sysctl_handle_foo that know how to handle virtualized global 467 * variables: if 'arg1' is a pointer, then we transform it to the local vnet 468 * offset. 469 / 470int 471vnet_sysctl_handle_int(SYSCTL_HANDLER_ARGS) 472{ 473* 474 if (arg1 != NULL) 475 arg1 = (void )(curvnet->vnet_data_base + (uintptr_t)arg1); 476* return (sysctl_handle_int(oidp, arg1, arg2, req)); 477} 478 479int 480vnet_sysctl_handle_opaque(SYSCTL_HANDLER_ARGS) 481{ 482 483 if (arg1 != NULL) 484 arg1 = (void )(curvnet->vnet_data_base + (uintptr_t)arg1); 485* return (sysctl_handle_opaque(oidp, arg1, arg2, req)); 486} 487 488int 489vnet_sysctl_handle_string(SYSCTL_HANDLER_ARGS) 490{ 491 492 if (arg1 != NULL) 493 arg1 = (void )(curvnet->vnet_data_base + (uintptr_t)arg1); 494* return (sysctl_handle_string(oidp, arg1, arg2, req)); 495} 496 497int 498vnet_sysctl_handle_uint(SYSCTL_HANDLER_ARGS) 499{ 500 501 if (arg1 != NULL) 502 arg1 = (void )(curvnet->vnet_data_base + (uintptr_t)arg1); 503* return (sysctl_handle_int(oidp, arg1, arg2, req)); 504} 505 506/* 507 * Support for special SYSINIT handlers registered via VNET_SYSINIT() 508 * and VNET_SYSUNINIT(). 509 / 510void 511vnet_register_sysinit(void arg) 512{ 513 struct vnet_sysinit vs, vs2; 514 struct vnet vnet; 515* 516 vs = arg; 517 KASSERT(vs->subsystem > SI_SUB_VNET, ("vnet sysinit too early")); 518 519 /* Add the constructor to the global list of vnet constructors. / 520* VNET_SYSINIT_WLOCK(); 521 TAILQ_FOREACH(vs2, &vnet_constructors, link) { 522 if (vs2->subsystem > vs->subsystem) 523 break; 524 if (vs2->subsystem == vs->subsystem && vs2->order > vs->order) 525 break; 526 } 527 if (vs2 != NULL) 528 TAILQ_INSERT_BEFORE(vs2, vs, link); 529 else 530 TAILQ_INSERT_TAIL(&vnet_constructors, vs, link); 531 532 /* 533 * Invoke the constructor on all the existing vnets when it is 534 * registered. 535 / 536* VNET_FOREACH(vnet) { 537 CURVNET_SET_QUIET(vnet); 538 vs->func(vs->arg); 539 CURVNET_RESTORE(); 540 } 541 VNET_SYSINIT_WUNLOCK(); 542} 543 544void 545vnet_deregister_sysinit(void arg) 546{ 547* struct vnet_sysinit vs; 548* 549 vs = arg; 550 551 /* Remove the constructor from the global list of vnet constructors. / 552* VNET_SYSINIT_WLOCK(); 553 TAILQ_REMOVE(&vnet_constructors, vs, link); 554 VNET_SYSINIT_WUNLOCK(); 555} 556 557void 558vnet_register_sysuninit(void arg) 559{ 560* struct vnet_sysinit vs, vs2; 561 562 vs = arg; 563 564 /* Add the destructor to the global list of vnet destructors. / 565* VNET_SYSINIT_WLOCK(); 566 TAILQ_FOREACH(vs2, &vnet_destructors, link) { 567 if (vs2->subsystem > vs->subsystem) 568 break; 569 if (vs2->subsystem == vs->subsystem && vs2->order > vs->order) 570 break; 571 } 572 if (vs2 != NULL) 573 TAILQ_INSERT_BEFORE(vs2, vs, link); 574 else 575 TAILQ_INSERT_TAIL(&vnet_destructors, vs, link); 576 VNET_SYSINIT_WUNLOCK(); 577} 578 579void 580vnet_deregister_sysuninit(void arg) 581{ 582* struct vnet_sysinit vs; 583* struct vnet vnet; 584* 585 vs = arg; 586 587 /* 588 * Invoke the destructor on all the existing vnets when it is 589 * deregistered. 590 / 591* VNET_SYSINIT_WLOCK(); 592 VNET_FOREACH(vnet) { 593 CURVNET_SET_QUIET(vnet); 594 vs->func(vs->arg); 595 CURVNET_RESTORE(); 596 } 597 598 /* Remove the destructor from the global list of vnet destructors. / 599* TAILQ_REMOVE(&vnet_destructors, vs, link); 600 VNET_SYSINIT_WUNLOCK(); 601} 602 603/* 604 * Invoke all registered vnet constructors on the current vnet. Used during 605 * vnet construction. The caller is responsible for ensuring the new vnet is 606 * the current vnet and that the vnet_sysinit_sxlock lock is locked. 607 / 608void 609vnet_sysinit(void) 610{ 611* struct vnet_sysinit vs; 612* 613 VNET_SYSINIT_RLOCK(); 614 TAILQ_FOREACH(vs, &vnet_constructors, link) { 615 vs->func(vs->arg); 616 } 617 VNET_SYSINIT_RUNLOCK(); 618} 619 620/* 621 * Invoke all registered vnet destructors on the current vnet. Used during 622 * vnet destruction. The caller is responsible for ensuring the dying vnet 623 * the current vnet and that the vnet_sysinit_sxlock lock is locked. 624 / 625void 626vnet_sysuninit(void) 627{ 628* struct vnet_sysinit vs; 629* 630 VNET_SYSINIT_RLOCK(); 631 TAILQ_FOREACH_REVERSE(vs, &vnet_destructors, vnet_sysuninit_head, 632 link) { 633 vs->func(vs->arg); 634 } 635 VNET_SYSINIT_RUNLOCK(); 636} 637 638/* 639 * EVENTHANDLER(9) extensions. 640 / 641/ 642 * Invoke the eventhandler function originally registered with the possibly 643 * registered argument for all virtual network stack instances. 644 * 645 * This iterator can only be used for eventhandlers that do not take any 646 * additional arguments, as we do ignore the variadic arguments from the 647 * EVENTHANDLER_INVOKE() call. 648 / 649void 650vnet_global_eventhandler_iterator_func(void arg, ...) 651{ 652 VNET_ITERATOR_DECL(vnet_iter); 653 struct eventhandler_entry_vimage v_ee; 654* 655 /* 656 * There is a bug here in that we should actually cast things to 657 * (struct eventhandler_entry_ ## name ) but that's not easily 658* * possible in here so just re-using the variadic version we 659 * defined for the generic vimage case. 660 / 661* v_ee = arg; 662 VNET_LIST_RLOCK(); 663 VNET_FOREACH(vnet_iter) { 664 CURVNET_SET(vnet_iter); 665 ((vimage_iterator_func_t)v_ee->func)(v_ee->ee_arg); 666 CURVNET_RESTORE(); 667 } 668 VNET_LIST_RUNLOCK(); 669} 670 671#ifdef VNET_DEBUG 672struct vnet_recursion { 673 SLIST_ENTRY(vnet_recursion) vnr_le; 674 const char prev_fn; 675* const char where_fn; 676* int where_line; 677 struct vnet old_vnet; 678* struct vnet new_vnet; 679}; 680* 681static SLIST_HEAD(, vnet_recursion) vnet_recursions = 682 SLIST_HEAD_INITIALIZER(vnet_recursions); 683 684static void 685vnet_print_recursion(struct vnet_recursion vnr, int brief) 686{ 687* 688 if (!brief) 689 printf("CURVNET_SET() recursion in "); 690 printf("%s() line %d, prev in %s()", vnr->where_fn, vnr->where_line, 691 vnr->prev_fn); 692 if (brief) 693 printf(", "); 694 else 695 printf("\n "); 696 printf("%p -> %p\n", vnr->old_vnet, vnr->new_vnet); 697} 698 699void 700vnet_log_recursion(struct vnet old_vnet, const char old_fn, int line) 701{ 702 struct vnet_recursion vnr; 703* 704 /* Skip already logged recursion events. / 705* SLIST_FOREACH(vnr, &vnet_recursions, vnr_le) 706 if (vnr->prev_fn == old_fn && 707 vnr->where_fn == curthread->td_vnet_lpush && 708 vnr->where_line == line && 709 (vnr->old_vnet == vnr->new_vnet) == (curvnet == old_vnet)) 710 return; 711 712 vnr = malloc(sizeof(vnr), M_VNET, M_NOWAIT \| M_ZERO); 713* if (vnr == NULL) 714 panic("%s: malloc failed", __func__); 715 vnr->prev_fn = old_fn; 716 vnr->where_fn = curthread->td_vnet_lpush; 717 vnr->where_line = line; 718 vnr->old_vnet = old_vnet; 719 vnr->new_vnet = curvnet; 720 721 SLIST_INSERT_HEAD(&vnet_recursions, vnr, vnr_le); 722 723 vnet_print_recursion(vnr, 0); 724#ifdef KDB 725 kdb_backtrace(); 726#endif 727} 728#endif /* VNET_DEBUG / 729* 730/* 731 * DDB(4). 732 / 733#ifdef DDB 734DB_SHOW_COMMAND(vnets, db_show_vnets) 735{ 736* VNET_ITERATOR_DECL(vnet_iter); 737 738 VNET_FOREACH(vnet_iter) { 739 db_printf("vnet = %p\n", vnet_iter); 740 db_printf(" vnet_magic_n = 0x%x (%s, orig 0x%x)\n", 741 vnet_iter->vnet_magic_n, 742 (vnet_iter->vnet_magic_n == VNET_MAGIC_N) ? 743 "ok" : "mismatch", VNET_MAGIC_N); 744 db_printf(" vnet_ifcnt = %u\n", vnet_iter->vnet_ifcnt); 745 db_printf(" vnet_sockcnt = %u\n", vnet_iter->vnet_sockcnt); 746 db_printf(" vnet_data_mem = %p\n", vnet_iter->vnet_data_mem); 747 db_printf(" vnet_data_base = 0x%jx\n", 748 (uintmax_t)vnet_iter->vnet_data_base); 749 db_printf("\n"); 750 if (db_pager_quit) 751 break; 752 } 753} 754 755static void 756db_show_vnet_print_vs(struct vnet_sysinit vs, int ddb) 757{ 758* const char vsname, funcname; 759 c_db_sym_t sym; 760 db_expr_t offset; 761 762#define xprint(...) \ 763 if (ddb) \ 764 db_printf(__VA_ARGS__); \ 765 else \ 766 printf(__VA_ARGS__) 767 768 if (vs == NULL) { 769 xprint("%s: no vnet_sysinit * given\n", __func__); 770 return; 771 } 772 773 sym = db_search_symbol((vm_offset_t)vs, DB_STGY_ANY, &offset); 774 db_symbol_values(sym, &vsname, NULL); 775 sym = db_search_symbol((vm_offset_t)vs->func, DB_STGY_PROC, &offset); 776 db_symbol_values(sym, &funcname, NULL); 777 xprint("%s(%p)\n", (vsname != NULL) ? vsname : "", vs); 778 xprint(" 0x%08x 0x%08x\n", vs->subsystem, vs->order); 779 xprint(" %p(%s)(%p)\n", 780 vs->func, (funcname != NULL) ? funcname : "", vs->arg); 781#undef xprint 782} 783 784DB_SHOW_COMMAND(vnet_sysinit, db_show_vnet_sysinit) 785{ 786 struct vnet_sysinit vs; 787* 788 db_printf("VNET_SYSINIT vs Name(Ptr)\n"); 789 db_printf(" Subsystem Order\n"); 790 db_printf(" Function(Name)(Arg)\n"); 791 TAILQ_FOREACH(vs, &vnet_constructors, link) { 792 db_show_vnet_print_vs(vs, 1); 793 if (db_pager_quit) 794 break; 795 } 796} 797 798DB_SHOW_COMMAND(vnet_sysuninit, db_show_vnet_sysuninit) 799{ 800 struct vnet_sysinit vs; 801* 802 db_printf("VNET_SYSUNINIT vs Name(Ptr)\n"); 803 db_printf(" Subsystem Order\n"); 804 db_printf(" Function(Name)(Arg)\n"); 805 TAILQ_FOREACH_REVERSE(vs, &vnet_destructors, vnet_sysuninit_head, 806 link) { 807 db_show_vnet_print_vs(vs, 1); 808 if (db_pager_quit) 809 break; 810 } 811} 812 813#ifdef VNET_DEBUG 814DB_SHOW_COMMAND(vnetrcrs, db_show_vnetrcrs) 815{ 816 struct vnet_recursion vnr; 817* 818 SLIST_FOREACH(vnr, &vnet_recursions, vnr_le) 819 vnet_print_recursion(vnr, 1); 820} 821#endif 822#endif /* DDB */	181 182/* 183 * Global lists of subsystem constructor and destructors for vnets. They are 184 * registered via VNET_SYSINIT() and VNET_SYSUNINIT(). Both lists are 185 * protected by the vnet_sysinit_sxlock global lock. 186 / 187static TAILQ_HEAD(vnet_sysinit_head, vnet_sysinit) vnet_constructors = 188* TAILQ_HEAD_INITIALIZER(vnet_constructors); 189static TAILQ_HEAD(vnet_sysuninit_head, vnet_sysinit) vnet_destructors = 190 TAILQ_HEAD_INITIALIZER(vnet_destructors); 191 192struct sx vnet_sysinit_sxlock; 193 194#define VNET_SYSINIT_WLOCK() sx_xlock(&vnet_sysinit_sxlock); 195#define VNET_SYSINIT_WUNLOCK() sx_xunlock(&vnet_sysinit_sxlock); 196#define VNET_SYSINIT_RLOCK() sx_slock(&vnet_sysinit_sxlock); 197#define VNET_SYSINIT_RUNLOCK() sx_sunlock(&vnet_sysinit_sxlock); 198 199struct vnet_data_free { 200 uintptr_t vnd_start; 201 int vnd_len; 202 TAILQ_ENTRY(vnet_data_free) vnd_link; 203}; 204 205MALLOC_DEFINE(M_VNET_DATA_FREE, "vnet_data_free", "VNET resource accounting"); 206static TAILQ_HEAD(, vnet_data_free) vnet_data_free_head = 207 TAILQ_HEAD_INITIALIZER(vnet_data_free_head); 208static struct sx vnet_data_free_lock; 209 210SDT_PROVIDER_DEFINE(vnet); 211SDT_PROBE_DEFINE1(vnet, functions, vnet_alloc, entry, entry, "int"); 212SDT_PROBE_DEFINE2(vnet, functions, vnet_alloc, alloc, alloc, "int", 213 "struct vnet "); 214SDT_PROBE_DEFINE2(vnet, functions, vnet_alloc, return, return, 215* "int", "struct vnet "); 216SDT_PROBE_DEFINE2(vnet, functions, vnet_destroy, entry, entry, 217* "int", "struct vnet "); 218SDT_PROBE_DEFINE1(vnet, functions, vnet_destroy, return, entry, 219* "int"); 220 221#ifdef DDB 222static void db_show_vnet_print_vs(struct vnet_sysinit , int); 223#endif 224* 225/* 226 * Allocate a virtual network stack. 227 / 228struct vnet 229vnet_alloc(void) 230{ 231 struct vnet vnet; 232* 233 SDT_PROBE1(vnet, functions, vnet_alloc, entry, __LINE__); 234 vnet = malloc(sizeof(struct vnet), M_VNET, M_WAITOK \| M_ZERO); 235 vnet->vnet_magic_n = VNET_MAGIC_N; 236 SDT_PROBE2(vnet, functions, vnet_alloc, alloc, __LINE__, vnet); 237 238 /* 239 * Allocate storage for virtualized global variables and copy in 240 * initial values form our 'master' copy. 241 / 242* vnet->vnet_data_mem = malloc(VNET_SIZE, M_VNET_DATA, M_WAITOK); 243 memcpy(vnet->vnet_data_mem, (void )VNET_START, VNET_BYTES); 244* 245 /* 246 * All use of vnet-specific data will immediately subtract VNET_START 247 * from the base memory pointer, so pre-calculate that now to avoid 248 * it on each use. 249 / 250* vnet->vnet_data_base = (uintptr_t)vnet->vnet_data_mem - VNET_START; 251 252 /* Initialize / attach vnet module instances. / 253* CURVNET_SET_QUIET(vnet); 254 vnet_sysinit(); 255 CURVNET_RESTORE(); 256 257 VNET_LIST_WLOCK(); 258 LIST_INSERT_HEAD(&vnet_head, vnet, vnet_le); 259 VNET_LIST_WUNLOCK(); 260 261 SDT_PROBE2(vnet, functions, vnet_alloc, return, __LINE__, vnet); 262 return (vnet); 263} 264 265/* 266 * Destroy a virtual network stack. 267 / 268void 269vnet_destroy(struct vnet vnet) 270{ 271 struct ifnet ifp, nifp; 272 273 SDT_PROBE2(vnet, functions, vnet_destroy, entry, __LINE__, vnet); 274 KASSERT(vnet->vnet_sockcnt == 0, 275 ("%s: vnet still has sockets", __func__)); 276 277 VNET_LIST_WLOCK(); 278 LIST_REMOVE(vnet, vnet_le); 279 VNET_LIST_WUNLOCK(); 280 281 CURVNET_SET_QUIET(vnet); 282 283 /* Return all inherited interfaces to their parent vnets. / 284* TAILQ_FOREACH_SAFE(ifp, &V_ifnet, if_link, nifp) { 285 if (ifp->if_home_vnet != ifp->if_vnet) 286 if_vmove(ifp, ifp->if_home_vnet); 287 } 288 289 vnet_sysuninit(); 290 CURVNET_RESTORE(); 291 292 /* 293 * Release storage for the virtual network stack instance. 294 / 295* free(vnet->vnet_data_mem, M_VNET_DATA); 296 vnet->vnet_data_mem = NULL; 297 vnet->vnet_data_base = 0; 298 vnet->vnet_magic_n = 0xdeadbeef; 299 free(vnet, M_VNET); 300 SDT_PROBE1(vnet, functions, vnet_destroy, return, __LINE__); 301} 302 303/* 304 * Boot time initialization and allocation of virtual network stacks. 305 / 306static void 307vnet_init_prelink(void arg) 308{ 309 310 rw_init(&vnet_rwlock, "vnet_rwlock"); 311 sx_init(&vnet_sxlock, "vnet_sxlock"); 312 sx_init(&vnet_sysinit_sxlock, "vnet_sysinit_sxlock"); 313 LIST_INIT(&vnet_head); 314} 315SYSINIT(vnet_init_prelink, SI_SUB_VNET_PRELINK, SI_ORDER_FIRST, 316 vnet_init_prelink, NULL); 317 318static void 319vnet0_init(void arg) 320{ 321* 322 /* Warn people before take off - in case we crash early. / 323* printf("WARNING: VIMAGE (virtualized network stack) is a highly " 324 "experimental feature.\n"); 325 326 /* 327 * We MUST clear curvnet in vi_init_done() before going SMP, 328 * otherwise CURVNET_SET() macros would scream about unnecessary 329 * curvnet recursions. 330 / 331* curvnet = prison0.pr_vnet = vnet0 = vnet_alloc(); 332} 333SYSINIT(vnet0_init, SI_SUB_VNET, SI_ORDER_FIRST, vnet0_init, NULL); 334 335static void 336vnet_init_done(void unused) 337{ 338* 339 curvnet = NULL; 340} 341 342SYSINIT(vnet_init_done, SI_SUB_VNET_DONE, SI_ORDER_FIRST, vnet_init_done, 343 NULL); 344 345/* 346 * Once on boot, initialize the modspace freelist to entirely cover modspace. 347 / 348static void 349vnet_data_startup(void dummy __unused) 350{ 351 struct vnet_data_free df; 352* 353 df = malloc(sizeof(df), M_VNET_DATA_FREE, M_WAITOK \| M_ZERO); 354* df->vnd_start = (uintptr_t)&VNET_NAME(modspace); 355 df->vnd_len = VNET_MODMIN; 356 TAILQ_INSERT_HEAD(&vnet_data_free_head, df, vnd_link); 357 sx_init(&vnet_data_free_lock, "vnet_data alloc lock"); 358} 359SYSINIT(vnet_data, SI_SUB_KLD, SI_ORDER_FIRST, vnet_data_startup, 0); 360 361/* 362 * When a module is loaded and requires storage for a virtualized global 363 * variable, allocate space from the modspace free list. This interface 364 * should be used only by the kernel linker. 365 / 366void 367vnet_data_alloc(int size) 368{ 369 struct vnet_data_free df; 370* void s; 371* 372 s = NULL; 373 size = roundup2(size, sizeof(void )); 374* sx_xlock(&vnet_data_free_lock); 375 TAILQ_FOREACH(df, &vnet_data_free_head, vnd_link) { 376 if (df->vnd_len < size) 377 continue; 378 if (df->vnd_len == size) { 379 s = (void )df->vnd_start; 380* TAILQ_REMOVE(&vnet_data_free_head, df, vnd_link); 381 free(df, M_VNET_DATA_FREE); 382 break; 383 } 384 s = (void )df->vnd_start; 385* df->vnd_len -= size; 386 df->vnd_start = df->vnd_start + size; 387 break; 388 } 389 sx_xunlock(&vnet_data_free_lock); 390 391 return (s); 392} 393 394/* 395 * Free space for a virtualized global variable on module unload. 396 / 397void 398vnet_data_free(void start_arg, int size) 399{ 400 struct vnet_data_free df; 401* struct vnet_data_free dn; 402* uintptr_t start; 403 uintptr_t end; 404 405 size = roundup2(size, sizeof(void )); 406* start = (uintptr_t)start_arg; 407 end = start + size; 408 /* 409 * Free a region of space and merge it with as many neighbors as 410 * possible. Keeping the list sorted simplifies this operation. 411 / 412* sx_xlock(&vnet_data_free_lock); 413 TAILQ_FOREACH(df, &vnet_data_free_head, vnd_link) { 414 if (df->vnd_start > end) 415 break; 416 /* 417 * If we expand at the end of an entry we may have to merge 418 * it with the one following it as well. 419 / 420* if (df->vnd_start + df->vnd_len == start) { 421 df->vnd_len += size; 422 dn = TAILQ_NEXT(df, vnd_link); 423 if (df->vnd_start + df->vnd_len == dn->vnd_start) { 424 df->vnd_len += dn->vnd_len; 425 TAILQ_REMOVE(&vnet_data_free_head, dn, 426 vnd_link); 427 free(dn, M_VNET_DATA_FREE); 428 } 429 sx_xunlock(&vnet_data_free_lock); 430 return; 431 } 432 if (df->vnd_start == end) { 433 df->vnd_start = start; 434 df->vnd_len += size; 435 sx_xunlock(&vnet_data_free_lock); 436 return; 437 } 438 } 439 dn = malloc(sizeof(df), M_VNET_DATA_FREE, M_WAITOK \| M_ZERO); 440* dn->vnd_start = start; 441 dn->vnd_len = size; 442 if (df) 443 TAILQ_INSERT_BEFORE(df, dn, vnd_link); 444 else 445 TAILQ_INSERT_TAIL(&vnet_data_free_head, dn, vnd_link); 446 sx_xunlock(&vnet_data_free_lock); 447} 448 449/* 450 * When a new virtualized global variable has been allocated, propagate its 451 * initial value to each already-allocated virtual network stack instance. 452 / 453void 454vnet_data_copy(void start, int size) 455{ 456 struct vnet vnet; 457* 458 VNET_LIST_RLOCK(); 459 LIST_FOREACH(vnet, &vnet_head, vnet_le) 460 memcpy((void )((uintptr_t)vnet->vnet_data_base + 461* (uintptr_t)start), start, size); 462 VNET_LIST_RUNLOCK(); 463} 464 465/* 466 * Variants on sysctl_handle_foo that know how to handle virtualized global 467 * variables: if 'arg1' is a pointer, then we transform it to the local vnet 468 * offset. 469 / 470int 471vnet_sysctl_handle_int(SYSCTL_HANDLER_ARGS) 472{ 473* 474 if (arg1 != NULL) 475 arg1 = (void )(curvnet->vnet_data_base + (uintptr_t)arg1); 476* return (sysctl_handle_int(oidp, arg1, arg2, req)); 477} 478 479int 480vnet_sysctl_handle_opaque(SYSCTL_HANDLER_ARGS) 481{ 482 483 if (arg1 != NULL) 484 arg1 = (void )(curvnet->vnet_data_base + (uintptr_t)arg1); 485* return (sysctl_handle_opaque(oidp, arg1, arg2, req)); 486} 487 488int 489vnet_sysctl_handle_string(SYSCTL_HANDLER_ARGS) 490{ 491 492 if (arg1 != NULL) 493 arg1 = (void )(curvnet->vnet_data_base + (uintptr_t)arg1); 494* return (sysctl_handle_string(oidp, arg1, arg2, req)); 495} 496 497int 498vnet_sysctl_handle_uint(SYSCTL_HANDLER_ARGS) 499{ 500 501 if (arg1 != NULL) 502 arg1 = (void )(curvnet->vnet_data_base + (uintptr_t)arg1); 503* return (sysctl_handle_int(oidp, arg1, arg2, req)); 504} 505 506/* 507 * Support for special SYSINIT handlers registered via VNET_SYSINIT() 508 * and VNET_SYSUNINIT(). 509 / 510void 511vnet_register_sysinit(void arg) 512{ 513 struct vnet_sysinit vs, vs2; 514 struct vnet vnet; 515* 516 vs = arg; 517 KASSERT(vs->subsystem > SI_SUB_VNET, ("vnet sysinit too early")); 518 519 /* Add the constructor to the global list of vnet constructors. / 520* VNET_SYSINIT_WLOCK(); 521 TAILQ_FOREACH(vs2, &vnet_constructors, link) { 522 if (vs2->subsystem > vs->subsystem) 523 break; 524 if (vs2->subsystem == vs->subsystem && vs2->order > vs->order) 525 break; 526 } 527 if (vs2 != NULL) 528 TAILQ_INSERT_BEFORE(vs2, vs, link); 529 else 530 TAILQ_INSERT_TAIL(&vnet_constructors, vs, link); 531 532 /* 533 * Invoke the constructor on all the existing vnets when it is 534 * registered. 535 / 536* VNET_FOREACH(vnet) { 537 CURVNET_SET_QUIET(vnet); 538 vs->func(vs->arg); 539 CURVNET_RESTORE(); 540 } 541 VNET_SYSINIT_WUNLOCK(); 542} 543 544void 545vnet_deregister_sysinit(void arg) 546{ 547* struct vnet_sysinit vs; 548* 549 vs = arg; 550 551 /* Remove the constructor from the global list of vnet constructors. / 552* VNET_SYSINIT_WLOCK(); 553 TAILQ_REMOVE(&vnet_constructors, vs, link); 554 VNET_SYSINIT_WUNLOCK(); 555} 556 557void 558vnet_register_sysuninit(void arg) 559{ 560* struct vnet_sysinit vs, vs2; 561 562 vs = arg; 563 564 /* Add the destructor to the global list of vnet destructors. / 565* VNET_SYSINIT_WLOCK(); 566 TAILQ_FOREACH(vs2, &vnet_destructors, link) { 567 if (vs2->subsystem > vs->subsystem) 568 break; 569 if (vs2->subsystem == vs->subsystem && vs2->order > vs->order) 570 break; 571 } 572 if (vs2 != NULL) 573 TAILQ_INSERT_BEFORE(vs2, vs, link); 574 else 575 TAILQ_INSERT_TAIL(&vnet_destructors, vs, link); 576 VNET_SYSINIT_WUNLOCK(); 577} 578 579void 580vnet_deregister_sysuninit(void arg) 581{ 582* struct vnet_sysinit vs; 583* struct vnet vnet; 584* 585 vs = arg; 586 587 /* 588 * Invoke the destructor on all the existing vnets when it is 589 * deregistered. 590 / 591* VNET_SYSINIT_WLOCK(); 592 VNET_FOREACH(vnet) { 593 CURVNET_SET_QUIET(vnet); 594 vs->func(vs->arg); 595 CURVNET_RESTORE(); 596 } 597 598 /* Remove the destructor from the global list of vnet destructors. / 599* TAILQ_REMOVE(&vnet_destructors, vs, link); 600 VNET_SYSINIT_WUNLOCK(); 601} 602 603/* 604 * Invoke all registered vnet constructors on the current vnet. Used during 605 * vnet construction. The caller is responsible for ensuring the new vnet is 606 * the current vnet and that the vnet_sysinit_sxlock lock is locked. 607 / 608void 609vnet_sysinit(void) 610{ 611* struct vnet_sysinit vs; 612* 613 VNET_SYSINIT_RLOCK(); 614 TAILQ_FOREACH(vs, &vnet_constructors, link) { 615 vs->func(vs->arg); 616 } 617 VNET_SYSINIT_RUNLOCK(); 618} 619 620/* 621 * Invoke all registered vnet destructors on the current vnet. Used during 622 * vnet destruction. The caller is responsible for ensuring the dying vnet 623 * the current vnet and that the vnet_sysinit_sxlock lock is locked. 624 / 625void 626vnet_sysuninit(void) 627{ 628* struct vnet_sysinit vs; 629* 630 VNET_SYSINIT_RLOCK(); 631 TAILQ_FOREACH_REVERSE(vs, &vnet_destructors, vnet_sysuninit_head, 632 link) { 633 vs->func(vs->arg); 634 } 635 VNET_SYSINIT_RUNLOCK(); 636} 637 638/* 639 * EVENTHANDLER(9) extensions. 640 / 641/ 642 * Invoke the eventhandler function originally registered with the possibly 643 * registered argument for all virtual network stack instances. 644 * 645 * This iterator can only be used for eventhandlers that do not take any 646 * additional arguments, as we do ignore the variadic arguments from the 647 * EVENTHANDLER_INVOKE() call. 648 / 649void 650vnet_global_eventhandler_iterator_func(void arg, ...) 651{ 652 VNET_ITERATOR_DECL(vnet_iter); 653 struct eventhandler_entry_vimage v_ee; 654* 655 /* 656 * There is a bug here in that we should actually cast things to 657 * (struct eventhandler_entry_ ## name ) but that's not easily 658* * possible in here so just re-using the variadic version we 659 * defined for the generic vimage case. 660 / 661* v_ee = arg; 662 VNET_LIST_RLOCK(); 663 VNET_FOREACH(vnet_iter) { 664 CURVNET_SET(vnet_iter); 665 ((vimage_iterator_func_t)v_ee->func)(v_ee->ee_arg); 666 CURVNET_RESTORE(); 667 } 668 VNET_LIST_RUNLOCK(); 669} 670 671#ifdef VNET_DEBUG 672struct vnet_recursion { 673 SLIST_ENTRY(vnet_recursion) vnr_le; 674 const char prev_fn; 675* const char where_fn; 676* int where_line; 677 struct vnet old_vnet; 678* struct vnet new_vnet; 679}; 680* 681static SLIST_HEAD(, vnet_recursion) vnet_recursions = 682 SLIST_HEAD_INITIALIZER(vnet_recursions); 683 684static void 685vnet_print_recursion(struct vnet_recursion vnr, int brief) 686{ 687* 688 if (!brief) 689 printf("CURVNET_SET() recursion in "); 690 printf("%s() line %d, prev in %s()", vnr->where_fn, vnr->where_line, 691 vnr->prev_fn); 692 if (brief) 693 printf(", "); 694 else 695 printf("\n "); 696 printf("%p -> %p\n", vnr->old_vnet, vnr->new_vnet); 697} 698 699void 700vnet_log_recursion(struct vnet old_vnet, const char old_fn, int line) 701{ 702 struct vnet_recursion vnr; 703* 704 /* Skip already logged recursion events. / 705* SLIST_FOREACH(vnr, &vnet_recursions, vnr_le) 706 if (vnr->prev_fn == old_fn && 707 vnr->where_fn == curthread->td_vnet_lpush && 708 vnr->where_line == line && 709 (vnr->old_vnet == vnr->new_vnet) == (curvnet == old_vnet)) 710 return; 711 712 vnr = malloc(sizeof(vnr), M_VNET, M_NOWAIT \| M_ZERO); 713* if (vnr == NULL) 714 panic("%s: malloc failed", __func__); 715 vnr->prev_fn = old_fn; 716 vnr->where_fn = curthread->td_vnet_lpush; 717 vnr->where_line = line; 718 vnr->old_vnet = old_vnet; 719 vnr->new_vnet = curvnet; 720 721 SLIST_INSERT_HEAD(&vnet_recursions, vnr, vnr_le); 722 723 vnet_print_recursion(vnr, 0); 724#ifdef KDB 725 kdb_backtrace(); 726#endif 727} 728#endif /* VNET_DEBUG / 729* 730/* 731 * DDB(4). 732 / 733#ifdef DDB 734DB_SHOW_COMMAND(vnets, db_show_vnets) 735{ 736* VNET_ITERATOR_DECL(vnet_iter); 737 738 VNET_FOREACH(vnet_iter) { 739 db_printf("vnet = %p\n", vnet_iter); 740 db_printf(" vnet_magic_n = 0x%x (%s, orig 0x%x)\n", 741 vnet_iter->vnet_magic_n, 742 (vnet_iter->vnet_magic_n == VNET_MAGIC_N) ? 743 "ok" : "mismatch", VNET_MAGIC_N); 744 db_printf(" vnet_ifcnt = %u\n", vnet_iter->vnet_ifcnt); 745 db_printf(" vnet_sockcnt = %u\n", vnet_iter->vnet_sockcnt); 746 db_printf(" vnet_data_mem = %p\n", vnet_iter->vnet_data_mem); 747 db_printf(" vnet_data_base = 0x%jx\n", 748 (uintmax_t)vnet_iter->vnet_data_base); 749 db_printf("\n"); 750 if (db_pager_quit) 751 break; 752 } 753} 754 755static void 756db_show_vnet_print_vs(struct vnet_sysinit vs, int ddb) 757{ 758* const char vsname, funcname; 759 c_db_sym_t sym; 760 db_expr_t offset; 761 762#define xprint(...) \ 763 if (ddb) \ 764 db_printf(__VA_ARGS__); \ 765 else \ 766 printf(__VA_ARGS__) 767 768 if (vs == NULL) { 769 xprint("%s: no vnet_sysinit * given\n", __func__); 770 return; 771 } 772 773 sym = db_search_symbol((vm_offset_t)vs, DB_STGY_ANY, &offset); 774 db_symbol_values(sym, &vsname, NULL); 775 sym = db_search_symbol((vm_offset_t)vs->func, DB_STGY_PROC, &offset); 776 db_symbol_values(sym, &funcname, NULL); 777 xprint("%s(%p)\n", (vsname != NULL) ? vsname : "", vs); 778 xprint(" 0x%08x 0x%08x\n", vs->subsystem, vs->order); 779 xprint(" %p(%s)(%p)\n", 780 vs->func, (funcname != NULL) ? funcname : "", vs->arg); 781#undef xprint 782} 783 784DB_SHOW_COMMAND(vnet_sysinit, db_show_vnet_sysinit) 785{ 786 struct vnet_sysinit vs; 787* 788 db_printf("VNET_SYSINIT vs Name(Ptr)\n"); 789 db_printf(" Subsystem Order\n"); 790 db_printf(" Function(Name)(Arg)\n"); 791 TAILQ_FOREACH(vs, &vnet_constructors, link) { 792 db_show_vnet_print_vs(vs, 1); 793 if (db_pager_quit) 794 break; 795 } 796} 797 798DB_SHOW_COMMAND(vnet_sysuninit, db_show_vnet_sysuninit) 799{ 800 struct vnet_sysinit vs; 801* 802 db_printf("VNET_SYSUNINIT vs Name(Ptr)\n"); 803 db_printf(" Subsystem Order\n"); 804 db_printf(" Function(Name)(Arg)\n"); 805 TAILQ_FOREACH_REVERSE(vs, &vnet_destructors, vnet_sysuninit_head, 806 link) { 807 db_show_vnet_print_vs(vs, 1); 808 if (db_pager_quit) 809 break; 810 } 811} 812 813#ifdef VNET_DEBUG 814DB_SHOW_COMMAND(vnetrcrs, db_show_vnetrcrs) 815{ 816 struct vnet_recursion vnr; 817* 818 SLIST_FOREACH(vnr, &vnet_recursions, vnr_le) 819 vnet_print_recursion(vnr, 1); 820} 821#endif 822#endif /* DDB */