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/filter.h>
  10 #include <linux/mm.h>
  11 #include <linux/sysctl.h>
  12 #include <linux/module.h>
  13 #include <linux/socket.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/ratelimit.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/init.h>
  18 #include <linux/slab.h>
  19 #include <linux/sched/isolation.h>
  20
  21 #include <net/ip.h>
  22 #include <net/sock.h>
  23 #include <net/net_ratelimit.h>
  24 #include <net/busy_poll.h>
  25 #include <net/pkt_sched.h>
  26 #include <net/hotdata.h>
  27 #include <net/rps.h>
  28
  29 #include "dev.h"
  30
  31 static int int_3600 = 3600;
  32 static int min_sndbuf = SOCK_MIN_SNDBUF;
  33 static int min_rcvbuf = SOCK_MIN_RCVBUF;
  34 static int max_skb_frags = MAX_SKB_FRAGS;
  35 static int min_mem_pcpu_rsv = SK_MEMORY_PCPU_RESERVE;
  36
  37 static int net_msg_warn;        /* Unused, but still a sysctl */
  38
  39 int sysctl_fb_tunnels_only_for_init_net __read_mostly = 0;
  40 EXPORT_SYMBOL(sysctl_fb_tunnels_only_for_init_net);
  41
  42 /* 0 - Keep current behavior:
  43  *     IPv4: inherit all current settings from init_net
  44  *     IPv6: reset all settings to default
  45  * 1 - Both inherit all current settings from init_net
  46  * 2 - Both reset all settings to default
  47  * 3 - Both inherit all settings from current netns
  48  */
  49 int sysctl_devconf_inherit_init_net __read_mostly;
  50 EXPORT_SYMBOL(sysctl_devconf_inherit_init_net);
  51
  52 #if IS_ENABLED(CONFIG_NET_FLOW_LIMIT) || IS_ENABLED(CONFIG_RPS)
  53 static void dump_cpumask(void *buffer, size_t *lenp, loff_t *ppos,
  54                          struct cpumask *mask)
  55 {
  56         char kbuf[128];
  57         int len;
  58
  59         if (*ppos || !*lenp) {
  60                 *lenp = 0;
  61                 return;
  62         }
  63
  64         len = min(sizeof(kbuf) - 1, *lenp);
  65         len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
  66         if (!len) {
  67                 *lenp = 0;
  68                 return;
  69         }
  70
  71         if (len < *lenp)
  72                 kbuf[len++] = '\n';
  73         memcpy(buffer, kbuf, len);
  74         *lenp = len;
  75         *ppos += len;
  76 }
  77 #endif
  78
  79 #ifdef CONFIG_RPS
  80
  81 static struct cpumask *rps_default_mask_cow_alloc(struct net *net)
  82 {
  83         struct cpumask *rps_default_mask;
  84
  85         if (net->core.rps_default_mask)
  86                 return net->core.rps_default_mask;
  87
  88         rps_default_mask = kzalloc(cpumask_size(), GFP_KERNEL);
  89         if (!rps_default_mask)
  90                 return NULL;
  91
  92         /* pairs with READ_ONCE in rx_queue_default_mask() */
  93         WRITE_ONCE(net->core.rps_default_mask, rps_default_mask);
  94         return rps_default_mask;
  95 }
  96
  97 static int rps_default_mask_sysctl(struct ctl_table *table, int write,
  98                                    void *buffer, size_t *lenp, loff_t *ppos)
  99 {
 100         struct net *net = (struct net *)table->data;
 101         int err = 0;
 102
 103         rtnl_lock();
 104         if (write) {
 105                 struct cpumask *rps_default_mask = rps_default_mask_cow_alloc(net);
 106
 107                 err = -ENOMEM;
 108                 if (!rps_default_mask)
 109                         goto done;
 110
 111                 err = cpumask_parse(buffer, rps_default_mask);
 112                 if (err)
 113                         goto done;
 114
 115                 err = rps_cpumask_housekeeping(rps_default_mask);
 116                 if (err)
 117                         goto done;
 118         } else {
 119                 dump_cpumask(buffer, lenp, ppos,
 120                              net->core.rps_default_mask ? : cpu_none_mask);
 121         }
 122
 123 done:
 124         rtnl_unlock();
 125         return err;
 126 }
 127
 128 static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
 129                                 void *buffer, size_t *lenp, loff_t *ppos)
 130 {
 131         unsigned int orig_size, size;
 132         int ret, i;
 133         struct ctl_table tmp = {
 134                 .data = &size,
 135                 .maxlen = sizeof(size),
 136                 .mode = table->mode
 137         };
 138         struct rps_sock_flow_table *orig_sock_table, *sock_table;
 139         static DEFINE_MUTEX(sock_flow_mutex);
 140
 141         mutex_lock(&sock_flow_mutex);
 142
 143         orig_sock_table = rcu_dereference_protected(
 144                                         net_hotdata.rps_sock_flow_table,
 145                                         lockdep_is_held(&sock_flow_mutex));
 146         size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
 147
 148         ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
 149
 150         if (write) {
 151                 if (size) {
 152                         if (size > 1<<29) {
 153                                 /* Enforce limit to prevent overflow */
 154                                 mutex_unlock(&sock_flow_mutex);
 155                                 return -EINVAL;
 156                         }
 157                         size = roundup_pow_of_two(size);
 158                         if (size != orig_size) {
 159                                 sock_table =
 160                                     vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
 161                                 if (!sock_table) {
 162                                         mutex_unlock(&sock_flow_mutex);
 163                                         return -ENOMEM;
 164                                 }
 165                                 net_hotdata.rps_cpu_mask =
 166                                         roundup_pow_of_two(nr_cpu_ids) - 1;
 167                                 sock_table->mask = size - 1;
 168                         } else
 169                                 sock_table = orig_sock_table;
 170
 171                         for (i = 0; i < size; i++)
 172                                 sock_table->ents[i] = RPS_NO_CPU;
 173                 } else
 174                         sock_table = NULL;
 175
 176                 if (sock_table != orig_sock_table) {
 177                         rcu_assign_pointer(net_hotdata.rps_sock_flow_table,
 178                                            sock_table);
 179                         if (sock_table) {
 180                                 static_branch_inc(&rps_needed);
 181                                 static_branch_inc(&rfs_needed);
 182                         }
 183                         if (orig_sock_table) {
 184                                 static_branch_dec(&rps_needed);
 185                                 static_branch_dec(&rfs_needed);
 186                                 kvfree_rcu_mightsleep(orig_sock_table);
 187                         }
 188                 }
 189         }
 190
 191         mutex_unlock(&sock_flow_mutex);
 192
 193         return ret;
 194 }
 195 #endif /* CONFIG_RPS */
 196
 197 #ifdef CONFIG_NET_FLOW_LIMIT
 198 static DEFINE_MUTEX(flow_limit_update_mutex);
 199
 200 static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
 201                                  void *buffer, size_t *lenp, loff_t *ppos)
 202 {
 203         struct sd_flow_limit *cur;
 204         struct softnet_data *sd;
 205         cpumask_var_t mask;
 206         int i, len, ret = 0;
 207
 208         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 209                 return -ENOMEM;
 210
 211         if (write) {
 212                 ret = cpumask_parse(buffer, mask);
 213                 if (ret)
 214                         goto done;
 215
 216                 mutex_lock(&flow_limit_update_mutex);
 217                 len = sizeof(*cur) + netdev_flow_limit_table_len;
 218                 for_each_possible_cpu(i) {
 219                         sd = &per_cpu(softnet_data, i);
 220                         cur = rcu_dereference_protected(sd->flow_limit,
 221                                      lockdep_is_held(&flow_limit_update_mutex));
 222                         if (cur && !cpumask_test_cpu(i, mask)) {
 223                                 RCU_INIT_POINTER(sd->flow_limit, NULL);
 224                                 kfree_rcu_mightsleep(cur);
 225                         } else if (!cur && cpumask_test_cpu(i, mask)) {
 226                                 cur = kzalloc_node(len, GFP_KERNEL,
 227                                                    cpu_to_node(i));
 228                                 if (!cur) {
 229                                         /* not unwinding previous changes */
 230                                         ret = -ENOMEM;
 231                                         goto write_unlock;
 232                                 }
 233                                 cur->num_buckets = netdev_flow_limit_table_len;
 234                                 rcu_assign_pointer(sd->flow_limit, cur);
 235                         }
 236                 }
 237 write_unlock:
 238                 mutex_unlock(&flow_limit_update_mutex);
 239         } else {
 240                 cpumask_clear(mask);
 241                 rcu_read_lock();
 242                 for_each_possible_cpu(i) {
 243                         sd = &per_cpu(softnet_data, i);
 244                         if (rcu_dereference(sd->flow_limit))
 245                                 cpumask_set_cpu(i, mask);
 246                 }
 247                 rcu_read_unlock();
 248
 249                 dump_cpumask(buffer, lenp, ppos, mask);
 250         }
 251
 252 done:
 253         free_cpumask_var(mask);
 254         return ret;
 255 }
 256
 257 static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
 258                                        void *buffer, size_t *lenp, loff_t *ppos)
 259 {
 260         unsigned int old, *ptr;
 261         int ret;
 262
 263         mutex_lock(&flow_limit_update_mutex);
 264
 265         ptr = table->data;
 266         old = *ptr;
 267         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 268         if (!ret && write && !is_power_of_2(*ptr)) {
 269                 *ptr = old;
 270                 ret = -EINVAL;
 271         }
 272
 273         mutex_unlock(&flow_limit_update_mutex);
 274         return ret;
 275 }
 276 #endif /* CONFIG_NET_FLOW_LIMIT */
 277
 278 #ifdef CONFIG_NET_SCHED
 279 static int set_default_qdisc(struct ctl_table *table, int write,
 280                              void *buffer, size_t *lenp, loff_t *ppos)
 281 {
 282         char id[IFNAMSIZ];
 283         struct ctl_table tbl = {
 284                 .data = id,
 285                 .maxlen = IFNAMSIZ,
 286         };
 287         int ret;
 288
 289         qdisc_get_default(id, IFNAMSIZ);
 290
 291         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 292         if (write && ret == 0)
 293                 ret = qdisc_set_default(id);
 294         return ret;
 295 }
 296 #endif
 297
 298 static int proc_do_dev_weight(struct ctl_table *table, int write,
 299                            void *buffer, size_t *lenp, loff_t *ppos)
 300 {
 301         static DEFINE_MUTEX(dev_weight_mutex);
 302         int ret, weight;
 303
 304         mutex_lock(&dev_weight_mutex);
 305         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 306         if (!ret && write) {
 307                 weight = READ_ONCE(weight_p);
 308                 WRITE_ONCE(net_hotdata.dev_rx_weight, weight * dev_weight_rx_bias);
 309                 WRITE_ONCE(net_hotdata.dev_tx_weight, weight * dev_weight_tx_bias);
 310         }
 311         mutex_unlock(&dev_weight_mutex);
 312
 313         return ret;
 314 }
 315
 316 static int proc_do_rss_key(struct ctl_table *table, int write,
 317                            void *buffer, size_t *lenp, loff_t *ppos)
 318 {
 319         struct ctl_table fake_table;
 320         char buf[NETDEV_RSS_KEY_LEN * 3];
 321
 322         snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key);
 323         fake_table.data = buf;
 324         fake_table.maxlen = sizeof(buf);
 325         return proc_dostring(&fake_table, write, buffer, lenp, ppos);
 326 }
 327
 328 #ifdef CONFIG_BPF_JIT
 329 static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write,
 330                                            void *buffer, size_t *lenp,
 331                                            loff_t *ppos)
 332 {
 333         int ret, jit_enable = *(int *)table->data;
 334         int min = *(int *)table->extra1;
 335         int max = *(int *)table->extra2;
 336         struct ctl_table tmp = *table;
 337
 338         if (write && !capable(CAP_SYS_ADMIN))
 339                 return -EPERM;
 340
 341         tmp.data = &jit_enable;
 342         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 343         if (write && !ret) {
 344                 if (jit_enable < 2 ||
 345                     (jit_enable == 2 && bpf_dump_raw_ok(current_cred()))) {
 346                         *(int *)table->data = jit_enable;
 347                         if (jit_enable == 2)
 348                                 pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n");
 349                 } else {
 350                         ret = -EPERM;
 351                 }
 352         }
 353
 354         if (write && ret && min == max)
 355                 pr_info_once("CONFIG_BPF_JIT_ALWAYS_ON is enabled, bpf_jit_enable is permanently set to 1.\n");
 356
 357         return ret;
 358 }
 359
 360 # ifdef CONFIG_HAVE_EBPF_JIT
 361 static int
 362 proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
 363                                     void *buffer, size_t *lenp, loff_t *ppos)
 364 {
 365         if (!capable(CAP_SYS_ADMIN))
 366                 return -EPERM;
 367
 368         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 369 }
 370 # endif /* CONFIG_HAVE_EBPF_JIT */
 371
 372 static int
 373 proc_dolongvec_minmax_bpf_restricted(struct ctl_table *table, int write,
 374                                      void *buffer, size_t *lenp, loff_t *ppos)
 375 {
 376         if (!capable(CAP_SYS_ADMIN))
 377                 return -EPERM;
 378
 379         return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
 380 }
 381 #endif
 382
 383 static struct ctl_table net_core_table[] = {
 384         {
 385                 .procname       = "wmem_max",
 386                 .data           = &sysctl_wmem_max,
 387                 .maxlen         = sizeof(int),
 388                 .mode           = 0644,
 389                 .proc_handler   = proc_dointvec_minmax,
 390                 .extra1         = &min_sndbuf,
 391         },
 392         {
 393                 .procname       = "rmem_max",
 394                 .data           = &sysctl_rmem_max,
 395                 .maxlen         = sizeof(int),
 396                 .mode           = 0644,
 397                 .proc_handler   = proc_dointvec_minmax,
 398                 .extra1         = &min_rcvbuf,
 399         },
 400         {
 401                 .procname       = "wmem_default",
 402                 .data           = &sysctl_wmem_default,
 403                 .maxlen         = sizeof(int),
 404                 .mode           = 0644,
 405                 .proc_handler   = proc_dointvec_minmax,
 406                 .extra1         = &min_sndbuf,
 407         },
 408         {
 409                 .procname       = "rmem_default",
 410                 .data           = &sysctl_rmem_default,
 411                 .maxlen         = sizeof(int),
 412                 .mode           = 0644,
 413                 .proc_handler   = proc_dointvec_minmax,
 414                 .extra1         = &min_rcvbuf,
 415         },
 416         {
 417                 .procname       = "mem_pcpu_rsv",
 418                 .data           = &sysctl_mem_pcpu_rsv,
 419                 .maxlen         = sizeof(int),
 420                 .mode           = 0644,
 421                 .proc_handler   = proc_dointvec_minmax,
 422                 .extra1         = &min_mem_pcpu_rsv,
 423         },
 424         {
 425                 .procname       = "dev_weight",
 426                 .data           = &weight_p,
 427                 .maxlen         = sizeof(int),
 428                 .mode           = 0644,
 429                 .proc_handler   = proc_do_dev_weight,
 430         },
 431         {
 432                 .procname       = "dev_weight_rx_bias",
 433                 .data           = &dev_weight_rx_bias,
 434                 .maxlen         = sizeof(int),
 435                 .mode           = 0644,
 436                 .proc_handler   = proc_do_dev_weight,
 437         },
 438         {
 439                 .procname       = "dev_weight_tx_bias",
 440                 .data           = &dev_weight_tx_bias,
 441                 .maxlen         = sizeof(int),
 442                 .mode           = 0644,
 443                 .proc_handler   = proc_do_dev_weight,
 444         },
 445         {
 446                 .procname       = "netdev_max_backlog",
 447                 .data           = &net_hotdata.max_backlog,
 448                 .maxlen         = sizeof(int),
 449                 .mode           = 0644,
 450                 .proc_handler   = proc_dointvec
 451         },
 452         {
 453                 .procname       = "netdev_rss_key",
 454                 .data           = &netdev_rss_key,
 455                 .maxlen         = sizeof(int),
 456                 .mode           = 0444,
 457                 .proc_handler   = proc_do_rss_key,
 458         },
 459 #ifdef CONFIG_BPF_JIT
 460         {
 461                 .procname       = "bpf_jit_enable",
 462                 .data           = &bpf_jit_enable,
 463                 .maxlen         = sizeof(int),
 464                 .mode           = 0644,
 465                 .proc_handler   = proc_dointvec_minmax_bpf_enable,
 466 # ifdef CONFIG_BPF_JIT_ALWAYS_ON
 467                 .extra1         = SYSCTL_ONE,
 468                 .extra2         = SYSCTL_ONE,
 469 # else
 470                 .extra1         = SYSCTL_ZERO,
 471                 .extra2         = SYSCTL_TWO,
 472 # endif
 473         },
 474 # ifdef CONFIG_HAVE_EBPF_JIT
 475         {
 476                 .procname       = "bpf_jit_harden",
 477                 .data           = &bpf_jit_harden,
 478                 .maxlen         = sizeof(int),
 479                 .mode           = 0600,
 480                 .proc_handler   = proc_dointvec_minmax_bpf_restricted,
 481                 .extra1         = SYSCTL_ZERO,
 482                 .extra2         = SYSCTL_TWO,
 483         },
 484         {
 485                 .procname       = "bpf_jit_kallsyms",
 486                 .data           = &bpf_jit_kallsyms,
 487                 .maxlen         = sizeof(int),
 488                 .mode           = 0600,
 489                 .proc_handler   = proc_dointvec_minmax_bpf_restricted,
 490                 .extra1         = SYSCTL_ZERO,
 491                 .extra2         = SYSCTL_ONE,
 492         },
 493 # endif
 494         {
 495                 .procname       = "bpf_jit_limit",
 496                 .data           = &bpf_jit_limit,
 497                 .maxlen         = sizeof(long),
 498                 .mode           = 0600,
 499                 .proc_handler   = proc_dolongvec_minmax_bpf_restricted,
 500                 .extra1         = SYSCTL_LONG_ONE,
 501                 .extra2         = &bpf_jit_limit_max,
 502         },
 503 #endif
 504         {
 505                 .procname       = "netdev_tstamp_prequeue",
 506                 .data           = &net_hotdata.tstamp_prequeue,
 507                 .maxlen         = sizeof(int),
 508                 .mode           = 0644,
 509                 .proc_handler   = proc_dointvec
 510         },
 511         {
 512                 .procname       = "message_cost",
 513                 .data           = &net_ratelimit_state.interval,
 514                 .maxlen         = sizeof(int),
 515                 .mode           = 0644,
 516                 .proc_handler   = proc_dointvec_jiffies,
 517         },
 518         {
 519                 .procname       = "message_burst",
 520                 .data           = &net_ratelimit_state.burst,
 521                 .maxlen         = sizeof(int),
 522                 .mode           = 0644,
 523                 .proc_handler   = proc_dointvec,
 524         },
 525         {
 526                 .procname       = "tstamp_allow_data",
 527                 .data           = &sysctl_tstamp_allow_data,
 528                 .maxlen         = sizeof(int),
 529                 .mode           = 0644,
 530                 .proc_handler   = proc_dointvec_minmax,
 531                 .extra1         = SYSCTL_ZERO,
 532                 .extra2         = SYSCTL_ONE
 533         },
 534 #ifdef CONFIG_RPS
 535         {
 536                 .procname       = "rps_sock_flow_entries",
 537                 .maxlen         = sizeof(int),
 538                 .mode           = 0644,
 539                 .proc_handler   = rps_sock_flow_sysctl
 540         },
 541 #endif
 542 #ifdef CONFIG_NET_FLOW_LIMIT
 543         {
 544                 .procname       = "flow_limit_cpu_bitmap",
 545                 .mode           = 0644,
 546                 .proc_handler   = flow_limit_cpu_sysctl
 547         },
 548         {
 549                 .procname       = "flow_limit_table_len",
 550                 .data           = &netdev_flow_limit_table_len,
 551                 .maxlen         = sizeof(int),
 552                 .mode           = 0644,
 553                 .proc_handler   = flow_limit_table_len_sysctl
 554         },
 555 #endif /* CONFIG_NET_FLOW_LIMIT */
 556 #ifdef CONFIG_NET_RX_BUSY_POLL
 557         {
 558                 .procname       = "busy_poll",
 559                 .data           = &sysctl_net_busy_poll,
 560                 .maxlen         = sizeof(unsigned int),
 561                 .mode           = 0644,
 562                 .proc_handler   = proc_dointvec_minmax,
 563                 .extra1         = SYSCTL_ZERO,
 564         },
 565         {
 566                 .procname       = "busy_read",
 567                 .data           = &sysctl_net_busy_read,
 568                 .maxlen         = sizeof(unsigned int),
 569                 .mode           = 0644,
 570                 .proc_handler   = proc_dointvec_minmax,
 571                 .extra1         = SYSCTL_ZERO,
 572         },
 573 #endif
 574 #ifdef CONFIG_NET_SCHED
 575         {
 576                 .procname       = "default_qdisc",
 577                 .mode           = 0644,
 578                 .maxlen         = IFNAMSIZ,
 579                 .proc_handler   = set_default_qdisc
 580         },
 581 #endif
 582         {
 583                 .procname       = "netdev_budget",
 584                 .data           = &net_hotdata.netdev_budget,
 585                 .maxlen         = sizeof(int),
 586                 .mode           = 0644,
 587                 .proc_handler   = proc_dointvec
 588         },
 589         {
 590                 .procname       = "warnings",
 591                 .data           = &net_msg_warn,
 592                 .maxlen         = sizeof(int),
 593                 .mode           = 0644,
 594                 .proc_handler   = proc_dointvec
 595         },
 596         {
 597                 .procname       = "max_skb_frags",
 598                 .data           = &sysctl_max_skb_frags,
 599                 .maxlen         = sizeof(int),
 600                 .mode           = 0644,
 601                 .proc_handler   = proc_dointvec_minmax,
 602                 .extra1         = SYSCTL_ONE,
 603                 .extra2         = &max_skb_frags,
 604         },
 605         {
 606                 .procname       = "netdev_budget_usecs",
 607                 .data           = &net_hotdata.netdev_budget_usecs,
 608                 .maxlen         = sizeof(unsigned int),
 609                 .mode           = 0644,
 610                 .proc_handler   = proc_dointvec_minmax,
 611                 .extra1         = SYSCTL_ZERO,
 612         },
 613         {
 614                 .procname       = "fb_tunnels_only_for_init_net",
 615                 .data           = &sysctl_fb_tunnels_only_for_init_net,
 616                 .maxlen         = sizeof(int),
 617                 .mode           = 0644,
 618                 .proc_handler   = proc_dointvec_minmax,
 619                 .extra1         = SYSCTL_ZERO,
 620                 .extra2         = SYSCTL_TWO,
 621         },
 622         {
 623                 .procname       = "devconf_inherit_init_net",
 624                 .data           = &sysctl_devconf_inherit_init_net,
 625                 .maxlen         = sizeof(int),
 626                 .mode           = 0644,
 627                 .proc_handler   = proc_dointvec_minmax,
 628                 .extra1         = SYSCTL_ZERO,
 629                 .extra2         = SYSCTL_THREE,
 630         },
 631         {
 632                 .procname       = "high_order_alloc_disable",
 633                 .data           = &net_high_order_alloc_disable_key.key,
 634                 .maxlen         = sizeof(net_high_order_alloc_disable_key),
 635                 .mode           = 0644,
 636                 .proc_handler   = proc_do_static_key,
 637         },
 638         {
 639                 .procname       = "gro_normal_batch",
 640                 .data           = &net_hotdata.gro_normal_batch,
 641                 .maxlen         = sizeof(unsigned int),
 642                 .mode           = 0644,
 643                 .proc_handler   = proc_dointvec_minmax,
 644                 .extra1         = SYSCTL_ONE,
 645         },
 646         {
 647                 .procname       = "netdev_unregister_timeout_secs",
 648                 .data           = &netdev_unregister_timeout_secs,
 649                 .maxlen         = sizeof(unsigned int),
 650                 .mode           = 0644,
 651                 .proc_handler   = proc_dointvec_minmax,
 652                 .extra1         = SYSCTL_ONE,
 653                 .extra2         = &int_3600,
 654         },
 655         {
 656                 .procname       = "skb_defer_max",
 657                 .data           = &sysctl_skb_defer_max,
 658                 .maxlen         = sizeof(unsigned int),
 659                 .mode           = 0644,
 660                 .proc_handler   = proc_dointvec_minmax,
 661                 .extra1         = SYSCTL_ZERO,
 662         },
 663         { }
 664 };
 665
 666 static struct ctl_table netns_core_table[] = {
 667 #if IS_ENABLED(CONFIG_RPS)
 668         {
 669                 .procname       = "rps_default_mask",
 670                 .data           = &init_net,
 671                 .mode           = 0644,
 672                 .proc_handler   = rps_default_mask_sysctl
 673         },
 674 #endif
 675         {
 676                 .procname       = "somaxconn",
 677                 .data           = &init_net.core.sysctl_somaxconn,
 678                 .maxlen         = sizeof(int),
 679                 .mode           = 0644,
 680                 .extra1         = SYSCTL_ZERO,
 681                 .proc_handler   = proc_dointvec_minmax
 682         },
 683         {
 684                 .procname       = "optmem_max",
 685                 .data           = &init_net.core.sysctl_optmem_max,
 686                 .maxlen         = sizeof(int),
 687                 .mode           = 0644,
 688                 .extra1         = SYSCTL_ZERO,
 689                 .proc_handler   = proc_dointvec_minmax
 690         },
 691         {
 692                 .procname       = "txrehash",
 693                 .data           = &init_net.core.sysctl_txrehash,
 694                 .maxlen         = sizeof(u8),
 695                 .mode           = 0644,
 696                 .extra1         = SYSCTL_ZERO,
 697                 .extra2         = SYSCTL_ONE,
 698                 .proc_handler   = proc_dou8vec_minmax,
 699         },
 700         { }
 701 };
 702
 703 static int __init fb_tunnels_only_for_init_net_sysctl_setup(char *str)
 704 {
 705         /* fallback tunnels for initns only */
 706         if (!strncmp(str, "initns", 6))
 707                 sysctl_fb_tunnels_only_for_init_net = 1;
 708         /* no fallback tunnels anywhere */
 709         else if (!strncmp(str, "none", 4))
 710                 sysctl_fb_tunnels_only_for_init_net = 2;
 711
 712         return 1;
 713 }
 714 __setup("fb_tunnels=", fb_tunnels_only_for_init_net_sysctl_setup);
 715
 716 static __net_init int sysctl_core_net_init(struct net *net)
 717 {
 718         struct ctl_table *tbl, *tmp;
 719
 720         tbl = netns_core_table;
 721         if (!net_eq(net, &init_net)) {
 722                 tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
 723                 if (tbl == NULL)
 724                         goto err_dup;
 725
 726                 for (tmp = tbl; tmp->procname; tmp++)
 727                         tmp->data += (char *)net - (char *)&init_net;
 728         }
 729
 730         net->core.sysctl_hdr = register_net_sysctl_sz(net, "net/core", tbl,
 731                                                       ARRAY_SIZE(netns_core_table));
 732         if (net->core.sysctl_hdr == NULL)
 733                 goto err_reg;
 734
 735         return 0;
 736
 737 err_reg:
 738         if (tbl != netns_core_table)
 739                 kfree(tbl);
 740 err_dup:
 741         return -ENOMEM;
 742 }
 743
 744 static __net_exit void sysctl_core_net_exit(struct net *net)
 745 {
 746         struct ctl_table *tbl;
 747
 748         tbl = net->core.sysctl_hdr->ctl_table_arg;
 749         unregister_net_sysctl_table(net->core.sysctl_hdr);
 750         BUG_ON(tbl == netns_core_table);
 751 #if IS_ENABLED(CONFIG_RPS)
 752         kfree(net->core.rps_default_mask);
 753 #endif
 754         kfree(tbl);
 755 }
 756
 757 static __net_initdata struct pernet_operations sysctl_core_ops = {
 758         .init = sysctl_core_net_init,
 759         .exit = sysctl_core_net_exit,
 760 };
 761
 762 static __init int sysctl_core_init(void)
 763 {
 764         register_net_sysctl(&init_net, "net/core", net_core_table);
 765         return register_pernet_subsys(&sysctl_core_ops);
 766 }
 767
 768 fs_initcall(sysctl_core_init);