net/core/sysctl_net_core.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* -*- linux-c -*-
   3  * sysctl_net_core.c: sysctl interface to net core subsystem.
   4  *
   5  * Begun April 1, 1996, Mike Shaver.
   6  * Added /proc/sys/net/core directory entry (empty =) ). [MS]
   7  */
   8
   9 #include <linux/mm.h>
  10 #include <linux/sysctl.h>
  11 #include <linux/module.h>
  12 #include <linux/socket.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/ratelimit.h>
  15 #include <linux/vmalloc.h>
  16 #include <linux/init.h>
  17 #include <linux/slab.h>
  18
  19 #include <net/ip.h>
  20 #include <net/sock.h>
  21 #include <net/net_ratelimit.h>
  22 #include <net/busy_poll.h>
  23 #include <net/pkt_sched.h>
  24
  25 static int two __maybe_unused = 2;
  26 static int min_sndbuf = SOCK_MIN_SNDBUF;
  27 static int min_rcvbuf = SOCK_MIN_RCVBUF;
  28 static int max_skb_frags = MAX_SKB_FRAGS;
  29 static long long_one __maybe_unused = 1;
  30 static long long_max __maybe_unused = LONG_MAX;
  31
  32 static int net_msg_warn;        /* Unused, but still a sysctl */
  33
  34 int sysctl_fb_tunnels_only_for_init_net __read_mostly = 0;
  35 EXPORT_SYMBOL(sysctl_fb_tunnels_only_for_init_net);
  36
  37 /* 0 - Keep current behavior:
  38  *     IPv4: inherit all current settings from init_net
  39  *     IPv6: reset all settings to default
  40  * 1 - Both inherit all current settings from init_net
  41  * 2 - Both reset all settings to default
  42  */
  43 int sysctl_devconf_inherit_init_net __read_mostly;
  44 EXPORT_SYMBOL(sysctl_devconf_inherit_init_net);
  45
  46 #ifdef CONFIG_RPS
  47 static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
  48                                 void *buffer, size_t *lenp, loff_t *ppos)
  49 {
  50         unsigned int orig_size, size;
  51         int ret, i;
  52         struct ctl_table tmp = {
  53                 .data = &size,
  54                 .maxlen = sizeof(size),
  55                 .mode = table->mode
  56         };
  57         struct rps_sock_flow_table *orig_sock_table, *sock_table;
  58         static DEFINE_MUTEX(sock_flow_mutex);
  59
  60         mutex_lock(&sock_flow_mutex);
  61
  62         orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
  63                                         lockdep_is_held(&sock_flow_mutex));
  64         size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
  65
  66         ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
  67
  68         if (write) {
  69                 if (size) {
  70                         if (size > 1<<29) {
  71                                 /* Enforce limit to prevent overflow */
  72                                 mutex_unlock(&sock_flow_mutex);
  73                                 return -EINVAL;
  74                         }
  75                         size = roundup_pow_of_two(size);
  76                         if (size != orig_size) {
  77                                 sock_table =
  78                                     vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
  79                                 if (!sock_table) {
  80                                         mutex_unlock(&sock_flow_mutex);
  81                                         return -ENOMEM;
  82                                 }
  83                                 rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1;
  84                                 sock_table->mask = size - 1;
  85                         } else
  86                                 sock_table = orig_sock_table;
  87
  88                         for (i = 0; i < size; i++)
  89                                 sock_table->ents[i] = RPS_NO_CPU;
  90                 } else
  91                         sock_table = NULL;
  92
  93                 if (sock_table != orig_sock_table) {
  94                         rcu_assign_pointer(rps_sock_flow_table, sock_table);
  95                         if (sock_table) {
  96                                 static_branch_inc(&rps_needed);
  97                                 static_branch_inc(&rfs_needed);
  98                         }
  99                         if (orig_sock_table) {
 100                                 static_branch_dec(&rps_needed);
 101                                 static_branch_dec(&rfs_needed);
 102                                 synchronize_rcu();
 103                                 vfree(orig_sock_table);
 104                         }
 105                 }
 106         }
 107
 108         mutex_unlock(&sock_flow_mutex);
 109
 110         return ret;
 111 }
 112 #endif /* CONFIG_RPS */
 113
 114 #ifdef CONFIG_NET_FLOW_LIMIT
 115 static DEFINE_MUTEX(flow_limit_update_mutex);
 116
 117 static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
 118                                  void *buffer, size_t *lenp, loff_t *ppos)
 119 {
 120         struct sd_flow_limit *cur;
 121         struct softnet_data *sd;
 122         cpumask_var_t mask;
 123         int i, len, ret = 0;
 124
 125         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 126                 return -ENOMEM;
 127
 128         if (write) {
 129                 ret = cpumask_parse(buffer, mask);
 130                 if (ret)
 131                         goto done;
 132
 133                 mutex_lock(&flow_limit_update_mutex);
 134                 len = sizeof(*cur) + netdev_flow_limit_table_len;
 135                 for_each_possible_cpu(i) {
 136                         sd = &per_cpu(softnet_data, i);
 137                         cur = rcu_dereference_protected(sd->flow_limit,
 138                                      lockdep_is_held(&flow_limit_update_mutex));
 139                         if (cur && !cpumask_test_cpu(i, mask)) {
 140                                 RCU_INIT_POINTER(sd->flow_limit, NULL);
 141                                 synchronize_rcu();
 142                                 kfree(cur);
 143                         } else if (!cur && cpumask_test_cpu(i, mask)) {
 144                                 cur = kzalloc_node(len, GFP_KERNEL,
 145                                                    cpu_to_node(i));
 146                                 if (!cur) {
 147                                         /* not unwinding previous changes */
 148                                         ret = -ENOMEM;
 149                                         goto write_unlock;
 150                                 }
 151                                 cur->num_buckets = netdev_flow_limit_table_len;
 152                                 rcu_assign_pointer(sd->flow_limit, cur);
 153                         }
 154                 }
 155 write_unlock:
 156                 mutex_unlock(&flow_limit_update_mutex);
 157         } else {
 158                 char kbuf[128];
 159
 160                 if (*ppos || !*lenp) {
 161                         *lenp = 0;
 162                         goto done;
 163                 }
 164
 165                 cpumask_clear(mask);
 166                 rcu_read_lock();
 167                 for_each_possible_cpu(i) {
 168                         sd = &per_cpu(softnet_data, i);
 169                         if (rcu_dereference(sd->flow_limit))
 170                                 cpumask_set_cpu(i, mask);
 171                 }
 172                 rcu_read_unlock();
 173
 174                 len = min(sizeof(kbuf) - 1, *lenp);
 175                 len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
 176                 if (!len) {
 177                         *lenp = 0;
 178                         goto done;
 179                 }
 180                 if (len < *lenp)
 181                         kbuf[len++] = '\n';
 182                 memcpy(buffer, kbuf, len);
 183                 *lenp = len;
 184                 *ppos += len;
 185         }
 186
 187 done:
 188         free_cpumask_var(mask);
 189         return ret;
 190 }
 191
 192 static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
 193                                        void *buffer, size_t *lenp, loff_t *ppos)
 194 {
 195         unsigned int old, *ptr;
 196         int ret;
 197
 198         mutex_lock(&flow_limit_update_mutex);
 199
 200         ptr = table->data;
 201         old = *ptr;
 202         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 203         if (!ret && write && !is_power_of_2(*ptr)) {
 204                 *ptr = old;
 205                 ret = -EINVAL;
 206         }
 207
 208         mutex_unlock(&flow_limit_update_mutex);
 209         return ret;
 210 }
 211 #endif /* CONFIG_NET_FLOW_LIMIT */
 212
 213 #ifdef CONFIG_NET_SCHED
 214 static int set_default_qdisc(struct ctl_table *table, int write,
 215                              void *buffer, size_t *lenp, loff_t *ppos)
 216 {
 217         char id[IFNAMSIZ];
 218         struct ctl_table tbl = {
 219                 .data = id,
 220                 .maxlen = IFNAMSIZ,
 221         };
 222         int ret;
 223
 224         qdisc_get_default(id, IFNAMSIZ);
 225
 226         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 227         if (write && ret == 0)
 228                 ret = qdisc_set_default(id);
 229         return ret;
 230 }
 231 #endif
 232
 233 static int proc_do_dev_weight(struct ctl_table *table, int write,
 234                            void *buffer, size_t *lenp, loff_t *ppos)
 235 {
 236         int ret;
 237
 238         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 239         if (ret != 0)
 240                 return ret;
 241
 242         dev_rx_weight = weight_p * dev_weight_rx_bias;
 243         dev_tx_weight = weight_p * dev_weight_tx_bias;
 244
 245         return ret;
 246 }
 247
 248 static int proc_do_rss_key(struct ctl_table *table, int write,
 249                            void *buffer, size_t *lenp, loff_t *ppos)
 250 {
 251         struct ctl_table fake_table;
 252         char buf[NETDEV_RSS_KEY_LEN * 3];
 253
 254         snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key);
 255         fake_table.data = buf;
 256         fake_table.maxlen = sizeof(buf);
 257         return proc_dostring(&fake_table, write, buffer, lenp, ppos);
 258 }
 259
 260 #ifdef CONFIG_BPF_JIT
 261 static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write,
 262                                            void *buffer, size_t *lenp,
 263                                            loff_t *ppos)
 264 {
 265         int ret, jit_enable = *(int *)table->data;
 266         struct ctl_table tmp = *table;
 267
 268         if (write && !capable(CAP_SYS_ADMIN))
 269                 return -EPERM;
 270
 271         tmp.data = &jit_enable;
 272         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 273         if (write && !ret) {
 274                 if (jit_enable < 2 ||
 275                     (jit_enable == 2 && bpf_dump_raw_ok())) {
 276                         *(int *)table->data = jit_enable;
 277                         if (jit_enable == 2)
 278                                 pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n");
 279                 } else {
 280                         ret = -EPERM;
 281                 }
 282         }
 283         return ret;
 284 }
 285
 286 # ifdef CONFIG_HAVE_EBPF_JIT
 287 static int
 288 proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
 289                                     void *buffer, size_t *lenp, loff_t *ppos)
 290 {
 291         if (!capable(CAP_SYS_ADMIN))
 292                 return -EPERM;
 293
 294         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 295 }
 296 # endif /* CONFIG_HAVE_EBPF_JIT */
 297
 298 static int
 299 proc_dolongvec_minmax_bpf_restricted(struct ctl_table *table, int write,
 300                                      void *buffer, size_t *lenp, loff_t *ppos)
 301 {
 302         if (!capable(CAP_SYS_ADMIN))
 303                 return -EPERM;
 304
 305         return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
 306 }
 307 #endif
 308
 309 static struct ctl_table net_core_table[] = {
 310 #ifdef CONFIG_NET
 311         {
 312                 .procname       = "wmem_max",
 313                 .data           = &sysctl_wmem_max,
 314                 .maxlen         = sizeof(int),
 315                 .mode           = 0644,
 316                 .proc_handler   = proc_dointvec_minmax,
 317                 .extra1         = &min_sndbuf,
 318         },
 319         {
 320                 .procname       = "rmem_max",
 321                 .data           = &sysctl_rmem_max,
 322                 .maxlen         = sizeof(int),
 323                 .mode           = 0644,
 324                 .proc_handler   = proc_dointvec_minmax,
 325                 .extra1         = &min_rcvbuf,
 326         },
 327         {
 328                 .procname       = "wmem_default",
 329                 .data           = &sysctl_wmem_default,
 330                 .maxlen         = sizeof(int),
 331                 .mode           = 0644,
 332                 .proc_handler   = proc_dointvec_minmax,
 333                 .extra1         = &min_sndbuf,
 334         },
 335         {
 336                 .procname       = "rmem_default",
 337                 .data           = &sysctl_rmem_default,
 338                 .maxlen         = sizeof(int),
 339                 .mode           = 0644,
 340                 .proc_handler   = proc_dointvec_minmax,
 341                 .extra1         = &min_rcvbuf,
 342         },
 343         {
 344                 .procname       = "dev_weight",
 345                 .data           = &weight_p,
 346                 .maxlen         = sizeof(int),
 347                 .mode           = 0644,
 348                 .proc_handler   = proc_do_dev_weight,
 349         },
 350         {
 351                 .procname       = "dev_weight_rx_bias",
 352                 .data           = &dev_weight_rx_bias,
 353                 .maxlen         = sizeof(int),
 354                 .mode           = 0644,
 355                 .proc_handler   = proc_do_dev_weight,
 356         },
 357         {
 358                 .procname       = "dev_weight_tx_bias",
 359                 .data           = &dev_weight_tx_bias,
 360                 .maxlen         = sizeof(int),
 361                 .mode           = 0644,
 362                 .proc_handler   = proc_do_dev_weight,
 363         },
 364         {
 365                 .procname       = "netdev_max_backlog",
 366                 .data           = &netdev_max_backlog,
 367                 .maxlen         = sizeof(int),
 368                 .mode           = 0644,
 369                 .proc_handler   = proc_dointvec
 370         },
 371         {
 372                 .procname       = "netdev_rss_key",
 373                 .data           = &netdev_rss_key,
 374                 .maxlen         = sizeof(int),
 375                 .mode           = 0444,
 376                 .proc_handler   = proc_do_rss_key,
 377         },
 378 #ifdef CONFIG_BPF_JIT
 379         {
 380                 .procname       = "bpf_jit_enable",
 381                 .data           = &bpf_jit_enable,
 382                 .maxlen         = sizeof(int),
 383                 .mode           = 0644,
 384                 .proc_handler   = proc_dointvec_minmax_bpf_enable,
 385 # ifdef CONFIG_BPF_JIT_ALWAYS_ON
 386                 .extra1         = SYSCTL_ONE,
 387                 .extra2         = SYSCTL_ONE,
 388 # else
 389                 .extra1         = SYSCTL_ZERO,
 390                 .extra2         = &two,
 391 # endif
 392         },
 393 # ifdef CONFIG_HAVE_EBPF_JIT
 394         {
 395                 .procname       = "bpf_jit_harden",
 396                 .data           = &bpf_jit_harden,
 397                 .maxlen         = sizeof(int),
 398                 .mode           = 0600,
 399                 .proc_handler   = proc_dointvec_minmax_bpf_restricted,
 400                 .extra1         = SYSCTL_ZERO,
 401                 .extra2         = &two,
 402         },
 403         {
 404                 .procname       = "bpf_jit_kallsyms",
 405                 .data           = &bpf_jit_kallsyms,
 406                 .maxlen         = sizeof(int),
 407                 .mode           = 0600,
 408                 .proc_handler   = proc_dointvec_minmax_bpf_restricted,
 409                 .extra1         = SYSCTL_ZERO,
 410                 .extra2         = SYSCTL_ONE,
 411         },
 412 # endif
 413         {
 414                 .procname       = "bpf_jit_limit",
 415                 .data           = &bpf_jit_limit,
 416                 .maxlen         = sizeof(long),
 417                 .mode           = 0600,
 418                 .proc_handler   = proc_dolongvec_minmax_bpf_restricted,
 419                 .extra1         = &long_one,
 420                 .extra2         = &long_max,
 421         },
 422 #endif
 423         {
 424                 .procname       = "netdev_tstamp_prequeue",
 425                 .data           = &netdev_tstamp_prequeue,
 426                 .maxlen         = sizeof(int),
 427                 .mode           = 0644,
 428                 .proc_handler   = proc_dointvec
 429         },
 430         {
 431                 .procname       = "message_cost",
 432                 .data           = &net_ratelimit_state.interval,
 433                 .maxlen         = sizeof(int),
 434                 .mode           = 0644,
 435                 .proc_handler   = proc_dointvec_jiffies,
 436         },
 437         {
 438                 .procname       = "message_burst",
 439                 .data           = &net_ratelimit_state.burst,
 440                 .maxlen         = sizeof(int),
 441                 .mode           = 0644,
 442                 .proc_handler   = proc_dointvec,
 443         },
 444         {
 445                 .procname       = "optmem_max",
 446                 .data           = &sysctl_optmem_max,
 447                 .maxlen         = sizeof(int),
 448                 .mode           = 0644,
 449                 .proc_handler   = proc_dointvec
 450         },
 451         {
 452                 .procname       = "tstamp_allow_data",
 453                 .data           = &sysctl_tstamp_allow_data,
 454                 .maxlen         = sizeof(int),
 455                 .mode           = 0644,
 456                 .proc_handler   = proc_dointvec_minmax,
 457                 .extra1         = SYSCTL_ZERO,
 458                 .extra2         = SYSCTL_ONE
 459         },
 460 #ifdef CONFIG_RPS
 461         {
 462                 .procname       = "rps_sock_flow_entries",
 463                 .maxlen         = sizeof(int),
 464                 .mode           = 0644,
 465                 .proc_handler   = rps_sock_flow_sysctl
 466         },
 467 #endif
 468 #ifdef CONFIG_NET_FLOW_LIMIT
 469         {
 470                 .procname       = "flow_limit_cpu_bitmap",
 471                 .mode           = 0644,
 472                 .proc_handler   = flow_limit_cpu_sysctl
 473         },
 474         {
 475                 .procname       = "flow_limit_table_len",
 476                 .data           = &netdev_flow_limit_table_len,
 477                 .maxlen         = sizeof(int),
 478                 .mode           = 0644,
 479                 .proc_handler   = flow_limit_table_len_sysctl
 480         },
 481 #endif /* CONFIG_NET_FLOW_LIMIT */
 482 #ifdef CONFIG_NET_RX_BUSY_POLL
 483         {
 484                 .procname       = "busy_poll",
 485                 .data           = &sysctl_net_busy_poll,
 486                 .maxlen         = sizeof(unsigned int),
 487                 .mode           = 0644,
 488                 .proc_handler   = proc_dointvec_minmax,
 489                 .extra1         = SYSCTL_ZERO,
 490         },
 491         {
 492                 .procname       = "busy_read",
 493                 .data           = &sysctl_net_busy_read,
 494                 .maxlen         = sizeof(unsigned int),
 495                 .mode           = 0644,
 496                 .proc_handler   = proc_dointvec_minmax,
 497                 .extra1         = SYSCTL_ZERO,
 498         },
 499 #endif
 500 #ifdef CONFIG_NET_SCHED
 501         {
 502                 .procname       = "default_qdisc",
 503                 .mode           = 0644,
 504                 .maxlen         = IFNAMSIZ,
 505                 .proc_handler   = set_default_qdisc
 506         },
 507 #endif
 508 #endif /* CONFIG_NET */
 509         {
 510                 .procname       = "netdev_budget",
 511                 .data           = &netdev_budget,
 512                 .maxlen         = sizeof(int),
 513                 .mode           = 0644,
 514                 .proc_handler   = proc_dointvec
 515         },
 516         {
 517                 .procname       = "warnings",
 518                 .data           = &net_msg_warn,
 519                 .maxlen         = sizeof(int),
 520                 .mode           = 0644,
 521                 .proc_handler   = proc_dointvec
 522         },
 523         {
 524                 .procname       = "max_skb_frags",
 525                 .data           = &sysctl_max_skb_frags,
 526                 .maxlen         = sizeof(int),
 527                 .mode           = 0644,
 528                 .proc_handler   = proc_dointvec_minmax,
 529                 .extra1         = SYSCTL_ONE,
 530                 .extra2         = &max_skb_frags,
 531         },
 532         {
 533                 .procname       = "netdev_budget_usecs",
 534                 .data           = &netdev_budget_usecs,
 535                 .maxlen         = sizeof(unsigned int),
 536                 .mode           = 0644,
 537                 .proc_handler   = proc_dointvec_minmax,
 538                 .extra1         = SYSCTL_ZERO,
 539         },
 540         {
 541                 .procname       = "fb_tunnels_only_for_init_net",
 542                 .data           = &sysctl_fb_tunnels_only_for_init_net,
 543                 .maxlen         = sizeof(int),
 544                 .mode           = 0644,
 545                 .proc_handler   = proc_dointvec_minmax,
 546                 .extra1         = SYSCTL_ZERO,
 547                 .extra2         = SYSCTL_ONE,
 548         },
 549         {
 550                 .procname       = "devconf_inherit_init_net",
 551                 .data           = &sysctl_devconf_inherit_init_net,
 552                 .maxlen         = sizeof(int),
 553                 .mode           = 0644,
 554                 .proc_handler   = proc_dointvec_minmax,
 555                 .extra1         = SYSCTL_ZERO,
 556                 .extra2         = &two,
 557         },
 558         {
 559                 .procname       = "high_order_alloc_disable",
 560                 .data           = &net_high_order_alloc_disable_key.key,
 561                 .maxlen         = sizeof(net_high_order_alloc_disable_key),
 562                 .mode           = 0644,
 563                 .proc_handler   = proc_do_static_key,
 564         },
 565         {
 566                 .procname       = "gro_normal_batch",
 567                 .data           = &gro_normal_batch,
 568                 .maxlen         = sizeof(unsigned int),
 569                 .mode           = 0644,
 570                 .proc_handler   = proc_dointvec_minmax,
 571                 .extra1         = SYSCTL_ONE,
 572         },
 573         { }
 574 };
 575
 576 static struct ctl_table netns_core_table[] = {
 577         {
 578                 .procname       = "somaxconn",
 579                 .data           = &init_net.core.sysctl_somaxconn,
 580                 .maxlen         = sizeof(int),
 581                 .mode           = 0644,
 582                 .extra1         = SYSCTL_ZERO,
 583                 .proc_handler   = proc_dointvec_minmax
 584         },
 585         { }
 586 };
 587
 588 static __net_init int sysctl_core_net_init(struct net *net)
 589 {
 590         struct ctl_table *tbl;
 591
 592         tbl = netns_core_table;
 593         if (!net_eq(net, &init_net)) {
 594                 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
 595                 if (tbl == NULL)
 596                         goto err_dup;
 597
 598                 tbl[0].data = &net->core.sysctl_somaxconn;
 599
 600                 /* Don't export any sysctls to unprivileged users */
 601                 if (net->user_ns != &init_user_ns) {
 602                         tbl[0].procname = NULL;
 603                 }
 604         }
 605
 606         net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
 607         if (net->core.sysctl_hdr == NULL)
 608                 goto err_reg;
 609
 610         return 0;
 611
 612 err_reg:
 613         if (tbl != netns_core_table)
 614                 kfree(tbl);
 615 err_dup:
 616         return -ENOMEM;
 617 }
 618
 619 static __net_exit void sysctl_core_net_exit(struct net *net)
 620 {
 621         struct ctl_table *tbl;
 622
 623         tbl = net->core.sysctl_hdr->ctl_table_arg;
 624         unregister_net_sysctl_table(net->core.sysctl_hdr);
 625         BUG_ON(tbl == netns_core_table);
 626         kfree(tbl);
 627 }
 628
 629 static __net_initdata struct pernet_operations sysctl_core_ops = {
 630         .init = sysctl_core_net_init,
 631         .exit = sysctl_core_net_exit,
 632 };
 633
 634 static __init int sysctl_core_init(void)
 635 {
 636         register_net_sysctl(&init_net, "net/core", net_core_table);
 637         return register_pernet_subsys(&sysctl_core_ops);
 638 }
 639
 640 fs_initcall(sysctl_core_init);