1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   4 *
   5 * Begun April 1, 1996, Mike Shaver.
   6 * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   7 */
   8
   9#include <linux/mm.h>
  10#include <linux/module.h>
  11#include <linux/sysctl.h>
  12#include <linux/igmp.h>
  13#include <linux/inetdevice.h>
  14#include <linux/seqlock.h>
  15#include <linux/init.h>
  16#include <linux/slab.h>
  17#include <linux/nsproxy.h>
  18#include <linux/swap.h>
  19#include <net/snmp.h>
  20#include <net/icmp.h>
  21#include <net/ip.h>
  22#include <net/route.h>
  23#include <net/tcp.h>
  24#include <net/udp.h>
  25#include <net/cipso_ipv4.h>
  26#include <net/inet_frag.h>
  27#include <net/ping.h>
  28#include <net/protocol.h>
  29#include <net/netevent.h>
  30
  31static int two = 2;
 
  32static int four = 4;
  33static int thousand = 1000;
  34static int gso_max_segs = GSO_MAX_SEGS;
  35static int tcp_retr1_max = 255;
  36static int ip_local_port_range_min[] = { 1, 1 };
  37static int ip_local_port_range_max[] = { 65535, 65535 };
  38static int tcp_adv_win_scale_min = -31;
  39static int tcp_adv_win_scale_max = 31;
  40static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
  41static int tcp_min_snd_mss_max = 65535;
  42static int ip_privileged_port_min;
  43static int ip_privileged_port_max = 65535;
  44static int ip_ttl_min = 1;
  45static int ip_ttl_max = 255;
  46static int tcp_syn_retries_min = 1;
  47static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
  48static int ip_ping_group_range_min[] = { 0, 0 };
  49static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  50static int comp_sack_nr_max = 255;
  51static u32 u32_max_div_HZ = UINT_MAX / HZ;
  52static int one_day_secs = 24 * 3600;
  53
  54/* obsolete */
  55static int sysctl_tcp_low_latency __read_mostly;
  56
  57/* Update system visible IP port range */
  58static void set_local_port_range(struct net *net, int range[2])
  59{
  60	bool same_parity = !((range[0] ^ range[1]) & 1);
  61
  62	write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  63	if (same_parity && !net->ipv4.ip_local_ports.warned) {
  64		net->ipv4.ip_local_ports.warned = true;
  65		pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  66	}
  67	net->ipv4.ip_local_ports.range[0] = range[0];
  68	net->ipv4.ip_local_ports.range[1] = range[1];
  69	write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  70}
  71
  72/* Validate changes from /proc interface. */
  73static int ipv4_local_port_range(struct ctl_table *table, int write,
  74				 void __user *buffer,
  75				 size_t *lenp, loff_t *ppos)
  76{
  77	struct net *net =
  78		container_of(table->data, struct net, ipv4.ip_local_ports.range);
  79	int ret;
  80	int range[2];
  81	struct ctl_table tmp = {
  82		.data = &range,
  83		.maxlen = sizeof(range),
  84		.mode = table->mode,
  85		.extra1 = &ip_local_port_range_min,
  86		.extra2 = &ip_local_port_range_max,
  87	};
  88
  89	inet_get_local_port_range(net, &range[0], &range[1]);
  90
  91	ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  92
  93	if (write && ret == 0) {
  94		/* Ensure that the upper limit is not smaller than the lower,
  95		 * and that the lower does not encroach upon the privileged
  96		 * port limit.
  97		 */
  98		if ((range[1] < range[0]) ||
  99		    (range[0] < net->ipv4.sysctl_ip_prot_sock))
 100			ret = -EINVAL;
 101		else
 102			set_local_port_range(net, range);
 103	}
 104
 105	return ret;
 106}
 107
 108/* Validate changes from /proc interface. */
 109static int ipv4_privileged_ports(struct ctl_table *table, int write,
 110				void __user *buffer, size_t *lenp, loff_t *ppos)
 111{
 112	struct net *net = container_of(table->data, struct net,
 113	    ipv4.sysctl_ip_prot_sock);
 114	int ret;
 115	int pports;
 116	int range[2];
 117	struct ctl_table tmp = {
 118		.data = &pports,
 119		.maxlen = sizeof(pports),
 120		.mode = table->mode,
 121		.extra1 = &ip_privileged_port_min,
 122		.extra2 = &ip_privileged_port_max,
 123	};
 124
 125	pports = net->ipv4.sysctl_ip_prot_sock;
 126
 127	ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 128
 129	if (write && ret == 0) {
 130		inet_get_local_port_range(net, &range[0], &range[1]);
 131		/* Ensure that the local port range doesn't overlap with the
 132		 * privileged port range.
 133		 */
 134		if (range[0] < pports)
 135			ret = -EINVAL;
 136		else
 137			net->ipv4.sysctl_ip_prot_sock = pports;
 138	}
 139
 140	return ret;
 141}
 142
 143static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 144{
 145	kgid_t *data = table->data;
 146	struct net *net =
 147		container_of(table->data, struct net, ipv4.ping_group_range.range);
 148	unsigned int seq;
 149	do {
 150		seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 151
 152		*low = data[0];
 153		*high = data[1];
 154	} while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 155}
 156
 157/* Update system visible IP port range */
 158static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 159{
 160	kgid_t *data = table->data;
 161	struct net *net =
 162		container_of(table->data, struct net, ipv4.ping_group_range.range);
 163	write_seqlock(&net->ipv4.ping_group_range.lock);
 164	data[0] = low;
 165	data[1] = high;
 166	write_sequnlock(&net->ipv4.ping_group_range.lock);
 167}
 168
 169/* Validate changes from /proc interface. */
 170static int ipv4_ping_group_range(struct ctl_table *table, int write,
 171				 void __user *buffer,
 172				 size_t *lenp, loff_t *ppos)
 173{
 174	struct user_namespace *user_ns = current_user_ns();
 175	int ret;
 176	gid_t urange[2];
 177	kgid_t low, high;
 178	struct ctl_table tmp = {
 179		.data = &urange,
 180		.maxlen = sizeof(urange),
 181		.mode = table->mode,
 182		.extra1 = &ip_ping_group_range_min,
 183		.extra2 = &ip_ping_group_range_max,
 184	};
 185
 186	inet_get_ping_group_range_table(table, &low, &high);
 187	urange[0] = from_kgid_munged(user_ns, low);
 188	urange[1] = from_kgid_munged(user_ns, high);
 189	ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 190
 191	if (write && ret == 0) {
 192		low = make_kgid(user_ns, urange[0]);
 193		high = make_kgid(user_ns, urange[1]);
 194		if (!gid_valid(low) || !gid_valid(high))
 195			return -EINVAL;
 196		if (urange[1] < urange[0] || gid_lt(high, low)) {
 197			low = make_kgid(&init_user_ns, 1);
 198			high = make_kgid(&init_user_ns, 0);
 199		}
 200		set_ping_group_range(table, low, high);
 201	}
 202
 203	return ret;
 204}
 205
 206static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 207				    void __user *buffer,
 208				    size_t *lenp, loff_t *ppos)
 209{
 210	struct net *net;
 211	int ret;
 212
 213	net = container_of(table->data, struct net,
 214			   ipv4.sysctl_ip_fwd_update_priority);
 215	ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 216	if (write && ret == 0)
 217		call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 218					net);
 219
 220	return ret;
 221}
 222
 223static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 224				       void __user *buffer, size_t *lenp, loff_t *ppos)
 225{
 226	struct net *net = container_of(ctl->data, struct net,
 227				       ipv4.tcp_congestion_control);
 228	char val[TCP_CA_NAME_MAX];
 229	struct ctl_table tbl = {
 230		.data = val,
 231		.maxlen = TCP_CA_NAME_MAX,
 232	};
 233	int ret;
 234
 235	tcp_get_default_congestion_control(net, val);
 236
 237	ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 238	if (write && ret == 0)
 239		ret = tcp_set_default_congestion_control(net, val);
 240	return ret;
 241}
 242
 243static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 244						 int write,
 245						 void __user *buffer, size_t *lenp,
 246						 loff_t *ppos)
 247{
 248	struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 249	int ret;
 250
 251	tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 252	if (!tbl.data)
 253		return -ENOMEM;
 254	tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 255	ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 256	kfree(tbl.data);
 257	return ret;
 258}
 259
 260static int proc_allowed_congestion_control(struct ctl_table *ctl,
 261					   int write,
 262					   void __user *buffer, size_t *lenp,
 263					   loff_t *ppos)
 264{
 265	struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 266	int ret;
 267
 268	tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 269	if (!tbl.data)
 270		return -ENOMEM;
 271
 272	tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 273	ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 274	if (write && ret == 0)
 275		ret = tcp_set_allowed_congestion_control(tbl.data);
 276	kfree(tbl.data);
 277	return ret;
 278}
 279
 280static int sscanf_key(char *buf, __le32 *key)
 281{
 282	u32 user_key[4];
 283	int i, ret = 0;
 284
 285	if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
 286		   user_key + 2, user_key + 3) != 4) {
 287		ret = -EINVAL;
 288	} else {
 289		for (i = 0; i < ARRAY_SIZE(user_key); i++)
 290			key[i] = cpu_to_le32(user_key[i]);
 291	}
 292	pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 293		 user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
 294
 295	return ret;
 296}
 297
 298static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 299				 void __user *buffer, size_t *lenp,
 300				 loff_t *ppos)
 301{
 302	struct net *net = container_of(table->data, struct net,
 303	    ipv4.sysctl_tcp_fastopen);
 304	/* maxlen to print the list of keys in hex (*2), with dashes
 305	 * separating doublewords and a comma in between keys.
 306	 */
 307	struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
 308					    2 * TCP_FASTOPEN_KEY_MAX) +
 309					    (TCP_FASTOPEN_KEY_MAX * 5)) };
 310	struct tcp_fastopen_context *ctx;
 311	u32 user_key[TCP_FASTOPEN_KEY_MAX * 4];
 312	__le32 key[TCP_FASTOPEN_KEY_MAX * 4];
 313	char *backup_data;
 314	int ret, i = 0, off = 0, n_keys = 0;
 315
 316	tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 317	if (!tbl.data)
 318		return -ENOMEM;
 319
 320	rcu_read_lock();
 321	ctx = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
 322	if (ctx) {
 323		n_keys = tcp_fastopen_context_len(ctx);
 324		memcpy(&key[0], &ctx->key[0], TCP_FASTOPEN_KEY_LENGTH * n_keys);
 325	}
 326	rcu_read_unlock();
 327
 328	if (!n_keys) {
 329		memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
 330		n_keys = 1;
 331	}
 332
 333	for (i = 0; i < n_keys * 4; i++)
 334		user_key[i] = le32_to_cpu(key[i]);
 335
 336	for (i = 0; i < n_keys; i++) {
 337		off += snprintf(tbl.data + off, tbl.maxlen - off,
 338				"%08x-%08x-%08x-%08x",
 339				user_key[i * 4],
 340				user_key[i * 4 + 1],
 341				user_key[i * 4 + 2],
 342				user_key[i * 4 + 3]);
 343		if (i + 1 < n_keys)
 344			off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 345	}
 346
 347	ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 348
 349	if (write && ret == 0) {
 350		backup_data = strchr(tbl.data, ',');
 351		if (backup_data) {
 352			*backup_data = '\0';
 353			backup_data++;
 354		}
 355		if (sscanf_key(tbl.data, key)) {
 356			ret = -EINVAL;
 357			goto bad_key;
 358		}
 359		if (backup_data) {
 360			if (sscanf_key(backup_data, key + 4)) {
 361				ret = -EINVAL;
 362				goto bad_key;
 363			}
 364		}
 365		tcp_fastopen_reset_cipher(net, NULL, key,
 366					  backup_data ? key + 4 : NULL);
 367	}
 368
 369bad_key:
 
 
 
 370	kfree(tbl.data);
 371	return ret;
 372}
 373
 374static void proc_configure_early_demux(int enabled, int protocol)
 375{
 376	struct net_protocol *ipprot;
 377#if IS_ENABLED(CONFIG_IPV6)
 378	struct inet6_protocol *ip6prot;
 379#endif
 380
 381	rcu_read_lock();
 382
 383	ipprot = rcu_dereference(inet_protos[protocol]);
 384	if (ipprot)
 385		ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 386						NULL;
 387
 388#if IS_ENABLED(CONFIG_IPV6)
 389	ip6prot = rcu_dereference(inet6_protos[protocol]);
 390	if (ip6prot)
 391		ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 392						 NULL;
 393#endif
 394	rcu_read_unlock();
 395}
 396
 397static int proc_tcp_early_demux(struct ctl_table *table, int write,
 398				void __user *buffer, size_t *lenp, loff_t *ppos)
 399{
 400	int ret = 0;
 401
 402	ret = proc_dointvec(table, write, buffer, lenp, ppos);
 403
 404	if (write && !ret) {
 405		int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 406
 407		proc_configure_early_demux(enabled, IPPROTO_TCP);
 408	}
 409
 410	return ret;
 411}
 412
 413static int proc_udp_early_demux(struct ctl_table *table, int write,
 414				void __user *buffer, size_t *lenp, loff_t *ppos)
 415{
 416	int ret = 0;
 417
 418	ret = proc_dointvec(table, write, buffer, lenp, ppos);
 419
 420	if (write && !ret) {
 421		int enabled = init_net.ipv4.sysctl_udp_early_demux;
 422
 423		proc_configure_early_demux(enabled, IPPROTO_UDP);
 424	}
 425
 426	return ret;
 427}
 428
 429static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 430					     int write,
 431					     void __user *buffer,
 432					     size_t *lenp, loff_t *ppos)
 433{
 434	struct net *net = container_of(table->data, struct net,
 435	    ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 436	int ret;
 437
 438	ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 439	if (write && ret == 0)
 440		atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 441
 442	return ret;
 443}
 444
 445static int proc_tcp_available_ulp(struct ctl_table *ctl,
 446				  int write,
 447				  void __user *buffer, size_t *lenp,
 448				  loff_t *ppos)
 449{
 450	struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 451	int ret;
 452
 453	tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 454	if (!tbl.data)
 455		return -ENOMEM;
 456	tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 457	ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 458	kfree(tbl.data);
 459
 460	return ret;
 461}
 462
 463#ifdef CONFIG_IP_ROUTE_MULTIPATH
 464static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 465					  void __user *buffer, size_t *lenp,
 466					  loff_t *ppos)
 467{
 468	struct net *net = container_of(table->data, struct net,
 469	    ipv4.sysctl_fib_multipath_hash_policy);
 470	int ret;
 471
 472	ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 473	if (write && ret == 0)
 474		call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 475
 476	return ret;
 477}
 478#endif
 479
 480static struct ctl_table ipv4_table[] = {
 481	{
 482		.procname	= "tcp_max_orphans",
 483		.data		= &sysctl_tcp_max_orphans,
 484		.maxlen		= sizeof(int),
 485		.mode		= 0644,
 486		.proc_handler	= proc_dointvec
 487	},
 488	{
 489		.procname	= "inet_peer_threshold",
 490		.data		= &inet_peer_threshold,
 491		.maxlen		= sizeof(int),
 492		.mode		= 0644,
 493		.proc_handler	= proc_dointvec
 494	},
 495	{
 496		.procname	= "inet_peer_minttl",
 497		.data		= &inet_peer_minttl,
 498		.maxlen		= sizeof(int),
 499		.mode		= 0644,
 500		.proc_handler	= proc_dointvec_jiffies,
 501	},
 502	{
 503		.procname	= "inet_peer_maxttl",
 504		.data		= &inet_peer_maxttl,
 505		.maxlen		= sizeof(int),
 506		.mode		= 0644,
 507		.proc_handler	= proc_dointvec_jiffies,
 508	},
 509	{
 510		.procname	= "tcp_mem",
 511		.maxlen		= sizeof(sysctl_tcp_mem),
 512		.data		= &sysctl_tcp_mem,
 513		.mode		= 0644,
 514		.proc_handler	= proc_doulongvec_minmax,
 515	},
 516	{
 517		.procname	= "tcp_low_latency",
 518		.data		= &sysctl_tcp_low_latency,
 519		.maxlen		= sizeof(int),
 520		.mode		= 0644,
 521		.proc_handler	= proc_dointvec
 522	},
 523#ifdef CONFIG_NETLABEL
 524	{
 525		.procname	= "cipso_cache_enable",
 526		.data		= &cipso_v4_cache_enabled,
 527		.maxlen		= sizeof(int),
 528		.mode		= 0644,
 529		.proc_handler	= proc_dointvec,
 530	},
 531	{
 532		.procname	= "cipso_cache_bucket_size",
 533		.data		= &cipso_v4_cache_bucketsize,
 534		.maxlen		= sizeof(int),
 535		.mode		= 0644,
 536		.proc_handler	= proc_dointvec,
 537	},
 538	{
 539		.procname	= "cipso_rbm_optfmt",
 540		.data		= &cipso_v4_rbm_optfmt,
 541		.maxlen		= sizeof(int),
 542		.mode		= 0644,
 543		.proc_handler	= proc_dointvec,
 544	},
 545	{
 546		.procname	= "cipso_rbm_strictvalid",
 547		.data		= &cipso_v4_rbm_strictvalid,
 548		.maxlen		= sizeof(int),
 549		.mode		= 0644,
 550		.proc_handler	= proc_dointvec,
 551	},
 552#endif /* CONFIG_NETLABEL */
 553	{
 554		.procname	= "tcp_available_congestion_control",
 555		.maxlen		= TCP_CA_BUF_MAX,
 556		.mode		= 0444,
 557		.proc_handler   = proc_tcp_available_congestion_control,
 558	},
 559	{
 560		.procname	= "tcp_allowed_congestion_control",
 561		.maxlen		= TCP_CA_BUF_MAX,
 562		.mode		= 0644,
 563		.proc_handler   = proc_allowed_congestion_control,
 564	},
 565	{
 566		.procname	= "tcp_available_ulp",
 567		.maxlen		= TCP_ULP_BUF_MAX,
 568		.mode		= 0444,
 569		.proc_handler   = proc_tcp_available_ulp,
 570	},
 571	{
 572		.procname	= "icmp_msgs_per_sec",
 573		.data		= &sysctl_icmp_msgs_per_sec,
 574		.maxlen		= sizeof(int),
 575		.mode		= 0644,
 576		.proc_handler	= proc_dointvec_minmax,
 577		.extra1		= SYSCTL_ZERO,
 578	},
 579	{
 580		.procname	= "icmp_msgs_burst",
 581		.data		= &sysctl_icmp_msgs_burst,
 582		.maxlen		= sizeof(int),
 583		.mode		= 0644,
 584		.proc_handler	= proc_dointvec_minmax,
 585		.extra1		= SYSCTL_ZERO,
 586	},
 587	{
 588		.procname	= "udp_mem",
 589		.data		= &sysctl_udp_mem,
 590		.maxlen		= sizeof(sysctl_udp_mem),
 591		.mode		= 0644,
 592		.proc_handler	= proc_doulongvec_minmax,
 593	},
 594	{
 595		.procname	= "fib_sync_mem",
 596		.data		= &sysctl_fib_sync_mem,
 597		.maxlen		= sizeof(sysctl_fib_sync_mem),
 598		.mode		= 0644,
 599		.proc_handler	= proc_douintvec_minmax,
 600		.extra1		= &sysctl_fib_sync_mem_min,
 601		.extra2		= &sysctl_fib_sync_mem_max,
 602	},
 603	{
 604		.procname	= "tcp_rx_skb_cache",
 605		.data		= &tcp_rx_skb_cache_key.key,
 606		.mode		= 0644,
 607		.proc_handler	= proc_do_static_key,
 608	},
 609	{
 610		.procname	= "tcp_tx_skb_cache",
 611		.data		= &tcp_tx_skb_cache_key.key,
 612		.mode		= 0644,
 613		.proc_handler	= proc_do_static_key,
 614	},
 615	{ }
 616};
 617
 618static struct ctl_table ipv4_net_table[] = {
 619	{
 620		.procname	= "icmp_echo_ignore_all",
 621		.data		= &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 622		.maxlen		= sizeof(int),
 623		.mode		= 0644,
 624		.proc_handler	= proc_dointvec
 625	},
 626	{
 627		.procname	= "icmp_echo_ignore_broadcasts",
 628		.data		= &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 629		.maxlen		= sizeof(int),
 630		.mode		= 0644,
 631		.proc_handler	= proc_dointvec
 
 
 632	},
 633	{
 634		.procname	= "icmp_ignore_bogus_error_responses",
 635		.data		= &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 636		.maxlen		= sizeof(int),
 637		.mode		= 0644,
 638		.proc_handler	= proc_dointvec
 639	},
 640	{
 641		.procname	= "icmp_errors_use_inbound_ifaddr",
 642		.data		= &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 643		.maxlen		= sizeof(int),
 644		.mode		= 0644,
 645		.proc_handler	= proc_dointvec
 646	},
 647	{
 648		.procname	= "icmp_ratelimit",
 649		.data		= &init_net.ipv4.sysctl_icmp_ratelimit,
 650		.maxlen		= sizeof(int),
 651		.mode		= 0644,
 652		.proc_handler	= proc_dointvec_ms_jiffies,
 653	},
 654	{
 655		.procname	= "icmp_ratemask",
 656		.data		= &init_net.ipv4.sysctl_icmp_ratemask,
 657		.maxlen		= sizeof(int),
 658		.mode		= 0644,
 659		.proc_handler	= proc_dointvec
 660	},
 661	{
 662		.procname	= "ping_group_range",
 663		.data		= &init_net.ipv4.ping_group_range.range,
 664		.maxlen		= sizeof(gid_t)*2,
 665		.mode		= 0644,
 666		.proc_handler	= ipv4_ping_group_range,
 667	},
 668#ifdef CONFIG_NET_L3_MASTER_DEV
 669	{
 670		.procname	= "raw_l3mdev_accept",
 671		.data		= &init_net.ipv4.sysctl_raw_l3mdev_accept,
 672		.maxlen		= sizeof(int),
 673		.mode		= 0644,
 674		.proc_handler	= proc_dointvec_minmax,
 675		.extra1		= SYSCTL_ZERO,
 676		.extra2		= SYSCTL_ONE,
 677	},
 678#endif
 679	{
 680		.procname	= "tcp_ecn",
 681		.data		= &init_net.ipv4.sysctl_tcp_ecn,
 682		.maxlen		= sizeof(int),
 683		.mode		= 0644,
 684		.proc_handler	= proc_dointvec
 685	},
 686	{
 687		.procname	= "tcp_ecn_fallback",
 688		.data		= &init_net.ipv4.sysctl_tcp_ecn_fallback,
 689		.maxlen		= sizeof(int),
 690		.mode		= 0644,
 691		.proc_handler	= proc_dointvec
 692	},
 693	{
 694		.procname	= "ip_dynaddr",
 695		.data		= &init_net.ipv4.sysctl_ip_dynaddr,
 696		.maxlen		= sizeof(int),
 697		.mode		= 0644,
 698		.proc_handler	= proc_dointvec
 699	},
 700	{
 701		.procname	= "ip_early_demux",
 702		.data		= &init_net.ipv4.sysctl_ip_early_demux,
 703		.maxlen		= sizeof(int),
 704		.mode		= 0644,
 705		.proc_handler	= proc_dointvec
 706	},
 707	{
 708		.procname       = "udp_early_demux",
 709		.data           = &init_net.ipv4.sysctl_udp_early_demux,
 710		.maxlen         = sizeof(int),
 711		.mode           = 0644,
 712		.proc_handler   = proc_udp_early_demux
 713	},
 714	{
 715		.procname       = "tcp_early_demux",
 716		.data           = &init_net.ipv4.sysctl_tcp_early_demux,
 717		.maxlen         = sizeof(int),
 718		.mode           = 0644,
 719		.proc_handler   = proc_tcp_early_demux
 720	},
 721	{
 722		.procname	= "ip_default_ttl",
 723		.data		= &init_net.ipv4.sysctl_ip_default_ttl,
 724		.maxlen		= sizeof(int),
 725		.mode		= 0644,
 726		.proc_handler	= proc_dointvec_minmax,
 727		.extra1		= &ip_ttl_min,
 728		.extra2		= &ip_ttl_max,
 729	},
 730	{
 731		.procname	= "ip_local_port_range",
 732		.maxlen		= sizeof(init_net.ipv4.ip_local_ports.range),
 733		.data		= &init_net.ipv4.ip_local_ports.range,
 734		.mode		= 0644,
 735		.proc_handler	= ipv4_local_port_range,
 736	},
 737	{
 738		.procname	= "ip_local_reserved_ports",
 739		.data		= &init_net.ipv4.sysctl_local_reserved_ports,
 740		.maxlen		= 65536,
 741		.mode		= 0644,
 742		.proc_handler	= proc_do_large_bitmap,
 743	},
 744	{
 745		.procname	= "ip_no_pmtu_disc",
 746		.data		= &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 747		.maxlen		= sizeof(int),
 748		.mode		= 0644,
 749		.proc_handler	= proc_dointvec
 750	},
 751	{
 752		.procname	= "ip_forward_use_pmtu",
 753		.data		= &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 754		.maxlen		= sizeof(int),
 755		.mode		= 0644,
 756		.proc_handler	= proc_dointvec,
 757	},
 758	{
 759		.procname	= "ip_forward_update_priority",
 760		.data		= &init_net.ipv4.sysctl_ip_fwd_update_priority,
 761		.maxlen		= sizeof(int),
 762		.mode		= 0644,
 763		.proc_handler   = ipv4_fwd_update_priority,
 764		.extra1		= SYSCTL_ZERO,
 765		.extra2		= SYSCTL_ONE,
 766	},
 
 767	{
 768		.procname	= "ip_nonlocal_bind",
 769		.data		= &init_net.ipv4.sysctl_ip_nonlocal_bind,
 770		.maxlen		= sizeof(int),
 771		.mode		= 0644,
 772		.proc_handler	= proc_dointvec
 773	},
 
 774	{
 775		.procname	= "fwmark_reflect",
 776		.data		= &init_net.ipv4.sysctl_fwmark_reflect,
 777		.maxlen		= sizeof(int),
 778		.mode		= 0644,
 779		.proc_handler	= proc_dointvec,
 780	},
 781	{
 782		.procname	= "tcp_fwmark_accept",
 783		.data		= &init_net.ipv4.sysctl_tcp_fwmark_accept,
 784		.maxlen		= sizeof(int),
 785		.mode		= 0644,
 786		.proc_handler	= proc_dointvec,
 787	},
 788#ifdef CONFIG_NET_L3_MASTER_DEV
 789	{
 790		.procname	= "tcp_l3mdev_accept",
 791		.data		= &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 792		.maxlen		= sizeof(int),
 793		.mode		= 0644,
 794		.proc_handler	= proc_dointvec_minmax,
 795		.extra1		= SYSCTL_ZERO,
 796		.extra2		= SYSCTL_ONE,
 797	},
 798#endif
 799	{
 800		.procname	= "tcp_mtu_probing",
 801		.data		= &init_net.ipv4.sysctl_tcp_mtu_probing,
 802		.maxlen		= sizeof(int),
 803		.mode		= 0644,
 804		.proc_handler	= proc_dointvec,
 805	},
 806	{
 807		.procname	= "tcp_base_mss",
 808		.data		= &init_net.ipv4.sysctl_tcp_base_mss,
 809		.maxlen		= sizeof(int),
 810		.mode		= 0644,
 811		.proc_handler	= proc_dointvec,
 812	},
 813	{
 814		.procname	= "tcp_min_snd_mss",
 815		.data		= &init_net.ipv4.sysctl_tcp_min_snd_mss,
 816		.maxlen		= sizeof(int),
 817		.mode		= 0644,
 818		.proc_handler	= proc_dointvec_minmax,
 819		.extra1		= &tcp_min_snd_mss_min,
 820		.extra2		= &tcp_min_snd_mss_max,
 821	},
 822	{
 823		.procname	= "tcp_mtu_probe_floor",
 824		.data		= &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
 825		.maxlen		= sizeof(int),
 826		.mode		= 0644,
 827		.proc_handler	= proc_dointvec_minmax,
 828		.extra1		= &tcp_min_snd_mss_min,
 829		.extra2		= &tcp_min_snd_mss_max,
 830	},
 831	{
 832		.procname	= "tcp_probe_threshold",
 833		.data		= &init_net.ipv4.sysctl_tcp_probe_threshold,
 834		.maxlen		= sizeof(int),
 835		.mode		= 0644,
 836		.proc_handler	= proc_dointvec,
 837	},
 838	{
 839		.procname	= "tcp_probe_interval",
 840		.data		= &init_net.ipv4.sysctl_tcp_probe_interval,
 841		.maxlen		= sizeof(u32),
 842		.mode		= 0644,
 843		.proc_handler	= proc_douintvec_minmax,
 844		.extra2		= &u32_max_div_HZ,
 845	},
 846	{
 847		.procname	= "igmp_link_local_mcast_reports",
 848		.data		= &init_net.ipv4.sysctl_igmp_llm_reports,
 849		.maxlen		= sizeof(int),
 850		.mode		= 0644,
 851		.proc_handler	= proc_dointvec
 852	},
 853	{
 854		.procname	= "igmp_max_memberships",
 855		.data		= &init_net.ipv4.sysctl_igmp_max_memberships,
 856		.maxlen		= sizeof(int),
 857		.mode		= 0644,
 858		.proc_handler	= proc_dointvec
 859	},
 860	{
 861		.procname	= "igmp_max_msf",
 862		.data		= &init_net.ipv4.sysctl_igmp_max_msf,
 863		.maxlen		= sizeof(int),
 864		.mode		= 0644,
 865		.proc_handler	= proc_dointvec
 866	},
 867#ifdef CONFIG_IP_MULTICAST
 868	{
 869		.procname	= "igmp_qrv",
 870		.data		= &init_net.ipv4.sysctl_igmp_qrv,
 871		.maxlen		= sizeof(int),
 872		.mode		= 0644,
 873		.proc_handler	= proc_dointvec_minmax,
 874		.extra1		= SYSCTL_ONE
 875	},
 876#endif
 877	{
 878		.procname	= "tcp_congestion_control",
 879		.data		= &init_net.ipv4.tcp_congestion_control,
 880		.mode		= 0644,
 881		.maxlen		= TCP_CA_NAME_MAX,
 882		.proc_handler	= proc_tcp_congestion_control,
 883	},
 884	{
 885		.procname	= "tcp_keepalive_time",
 886		.data		= &init_net.ipv4.sysctl_tcp_keepalive_time,
 887		.maxlen		= sizeof(int),
 888		.mode		= 0644,
 889		.proc_handler	= proc_dointvec_jiffies,
 890	},
 891	{
 892		.procname	= "tcp_keepalive_probes",
 893		.data		= &init_net.ipv4.sysctl_tcp_keepalive_probes,
 894		.maxlen		= sizeof(int),
 895		.mode		= 0644,
 896		.proc_handler	= proc_dointvec
 897	},
 898	{
 899		.procname	= "tcp_keepalive_intvl",
 900		.data		= &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 901		.maxlen		= sizeof(int),
 902		.mode		= 0644,
 903		.proc_handler	= proc_dointvec_jiffies,
 904	},
 905	{
 906		.procname	= "tcp_syn_retries",
 907		.data		= &init_net.ipv4.sysctl_tcp_syn_retries,
 908		.maxlen		= sizeof(int),
 909		.mode		= 0644,
 910		.proc_handler	= proc_dointvec_minmax,
 911		.extra1		= &tcp_syn_retries_min,
 912		.extra2		= &tcp_syn_retries_max
 913	},
 914	{
 915		.procname	= "tcp_synack_retries",
 916		.data		= &init_net.ipv4.sysctl_tcp_synack_retries,
 917		.maxlen		= sizeof(int),
 918		.mode		= 0644,
 919		.proc_handler	= proc_dointvec
 920	},
 921#ifdef CONFIG_SYN_COOKIES
 922	{
 923		.procname	= "tcp_syncookies",
 924		.data		= &init_net.ipv4.sysctl_tcp_syncookies,
 925		.maxlen		= sizeof(int),
 926		.mode		= 0644,
 927		.proc_handler	= proc_dointvec
 928	},
 929#endif
 930	{
 931		.procname	= "tcp_reordering",
 932		.data		= &init_net.ipv4.sysctl_tcp_reordering,
 933		.maxlen		= sizeof(int),
 934		.mode		= 0644,
 935		.proc_handler	= proc_dointvec
 936	},
 937	{
 938		.procname	= "tcp_retries1",
 939		.data		= &init_net.ipv4.sysctl_tcp_retries1,
 940		.maxlen		= sizeof(int),
 941		.mode		= 0644,
 942		.proc_handler	= proc_dointvec_minmax,
 943		.extra2		= &tcp_retr1_max
 944	},
 945	{
 946		.procname	= "tcp_retries2",
 947		.data		= &init_net.ipv4.sysctl_tcp_retries2,
 948		.maxlen		= sizeof(int),
 949		.mode		= 0644,
 950		.proc_handler	= proc_dointvec
 951	},
 952	{
 953		.procname	= "tcp_orphan_retries",
 954		.data		= &init_net.ipv4.sysctl_tcp_orphan_retries,
 955		.maxlen		= sizeof(int),
 956		.mode		= 0644,
 957		.proc_handler	= proc_dointvec
 
 958	},
 959	{
 960		.procname	= "tcp_fin_timeout",
 961		.data		= &init_net.ipv4.sysctl_tcp_fin_timeout,
 962		.maxlen		= sizeof(int),
 963		.mode		= 0644,
 964		.proc_handler	= proc_dointvec_jiffies,
 965	},
 966	{
 967		.procname	= "tcp_notsent_lowat",
 968		.data		= &init_net.ipv4.sysctl_tcp_notsent_lowat,
 969		.maxlen		= sizeof(unsigned int),
 970		.mode		= 0644,
 971		.proc_handler	= proc_douintvec,
 
 
 972	},
 973	{
 974		.procname	= "tcp_tw_reuse",
 975		.data		= &init_net.ipv4.sysctl_tcp_tw_reuse,
 976		.maxlen		= sizeof(int),
 977		.mode		= 0644,
 978		.proc_handler	= proc_dointvec_minmax,
 979		.extra1		= SYSCTL_ZERO,
 980		.extra2		= &two,
 981	},
 982	{
 983		.procname	= "tcp_max_tw_buckets",
 984		.data		= &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 985		.maxlen		= sizeof(int),
 986		.mode		= 0644,
 987		.proc_handler	= proc_dointvec
 988	},
 989	{
 990		.procname	= "tcp_max_syn_backlog",
 991		.data		= &init_net.ipv4.sysctl_max_syn_backlog,
 992		.maxlen		= sizeof(int),
 993		.mode		= 0644,
 994		.proc_handler	= proc_dointvec
 995	},
 996	{
 997		.procname	= "tcp_fastopen",
 998		.data		= &init_net.ipv4.sysctl_tcp_fastopen,
 999		.maxlen		= sizeof(int),
1000		.mode		= 0644,
1001		.proc_handler	= proc_dointvec,
1002	},
1003	{
1004		.procname	= "tcp_fastopen_key",
1005		.mode		= 0600,
1006		.data		= &init_net.ipv4.sysctl_tcp_fastopen,
1007		/* maxlen to print the list of keys in hex (*2), with dashes
1008		 * separating doublewords and a comma in between keys.
1009		 */
1010		.maxlen		= ((TCP_FASTOPEN_KEY_LENGTH *
1011				   2 * TCP_FASTOPEN_KEY_MAX) +
1012				   (TCP_FASTOPEN_KEY_MAX * 5)),
1013		.proc_handler	= proc_tcp_fastopen_key,
1014	},
1015	{
1016		.procname	= "tcp_fastopen_blackhole_timeout_sec",
1017		.data		= &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1018		.maxlen		= sizeof(int),
1019		.mode		= 0644,
1020		.proc_handler	= proc_tfo_blackhole_detect_timeout,
1021		.extra1		= SYSCTL_ZERO,
1022	},
1023#ifdef CONFIG_IP_ROUTE_MULTIPATH
1024	{
1025		.procname	= "fib_multipath_use_neigh",
1026		.data		= &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1027		.maxlen		= sizeof(int),
1028		.mode		= 0644,
1029		.proc_handler	= proc_dointvec_minmax,
1030		.extra1		= SYSCTL_ZERO,
1031		.extra2		= SYSCTL_ONE,
1032	},
1033	{
1034		.procname	= "fib_multipath_hash_policy",
1035		.data		= &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1036		.maxlen		= sizeof(int),
1037		.mode		= 0644,
1038		.proc_handler	= proc_fib_multipath_hash_policy,
1039		.extra1		= SYSCTL_ZERO,
1040		.extra2		= &two,
1041	},
1042#endif
1043	{
1044		.procname	= "ip_unprivileged_port_start",
 
1045		.maxlen		= sizeof(int),
1046		.data		= &init_net.ipv4.sysctl_ip_prot_sock,
1047		.mode		= 0644,
1048		.proc_handler	= ipv4_privileged_ports,
1049	},
1050#ifdef CONFIG_NET_L3_MASTER_DEV
1051	{
1052		.procname	= "udp_l3mdev_accept",
1053		.data		= &init_net.ipv4.sysctl_udp_l3mdev_accept,
1054		.maxlen		= sizeof(int),
1055		.mode		= 0644,
1056		.proc_handler	= proc_dointvec_minmax,
1057		.extra1		= SYSCTL_ZERO,
1058		.extra2		= SYSCTL_ONE,
1059	},
1060#endif
1061	{
1062		.procname	= "tcp_sack",
1063		.data		= &init_net.ipv4.sysctl_tcp_sack,
1064		.maxlen		= sizeof(int),
1065		.mode		= 0644,
1066		.proc_handler	= proc_dointvec
1067	},
1068	{
1069		.procname	= "tcp_window_scaling",
1070		.data		= &init_net.ipv4.sysctl_tcp_window_scaling,
1071		.maxlen		= sizeof(int),
1072		.mode		= 0644,
1073		.proc_handler	= proc_dointvec
1074	},
1075	{
1076		.procname	= "tcp_timestamps",
1077		.data		= &init_net.ipv4.sysctl_tcp_timestamps,
1078		.maxlen		= sizeof(int),
1079		.mode		= 0644,
1080		.proc_handler	= proc_dointvec
1081	},
 
1082	{
1083		.procname	= "tcp_early_retrans",
1084		.data		= &init_net.ipv4.sysctl_tcp_early_retrans,
1085		.maxlen		= sizeof(int),
1086		.mode		= 0644,
1087		.proc_handler	= proc_dointvec_minmax,
1088		.extra1		= SYSCTL_ZERO,
1089		.extra2		= &four,
1090	},
1091	{
1092		.procname	= "tcp_recovery",
1093		.data		= &init_net.ipv4.sysctl_tcp_recovery,
1094		.maxlen		= sizeof(int),
1095		.mode		= 0644,
1096		.proc_handler	= proc_dointvec,
1097	},
1098	{
1099		.procname       = "tcp_thin_linear_timeouts",
1100		.data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1101		.maxlen         = sizeof(int),
1102		.mode           = 0644,
1103		.proc_handler   = proc_dointvec
1104	},
 
1105	{
1106		.procname	= "tcp_slow_start_after_idle",
1107		.data		= &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1108		.maxlen		= sizeof(int),
1109		.mode		= 0644,
1110		.proc_handler	= proc_dointvec
1111	},
 
1112	{
1113		.procname	= "tcp_retrans_collapse",
1114		.data		= &init_net.ipv4.sysctl_tcp_retrans_collapse,
1115		.maxlen		= sizeof(int),
1116		.mode		= 0644,
1117		.proc_handler	= proc_dointvec
1118	},
1119	{
1120		.procname	= "tcp_stdurg",
1121		.data		= &init_net.ipv4.sysctl_tcp_stdurg,
1122		.maxlen		= sizeof(int),
1123		.mode		= 0644,
1124		.proc_handler	= proc_dointvec
1125	},
1126	{
1127		.procname	= "tcp_rfc1337",
1128		.data		= &init_net.ipv4.sysctl_tcp_rfc1337,
1129		.maxlen		= sizeof(int),
1130		.mode		= 0644,
1131		.proc_handler	= proc_dointvec
1132	},
1133	{
1134		.procname	= "tcp_abort_on_overflow",
1135		.data		= &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1136		.maxlen		= sizeof(int),
1137		.mode		= 0644,
1138		.proc_handler	= proc_dointvec
1139	},
 
1140	{
1141		.procname	= "tcp_fack",
1142		.data		= &init_net.ipv4.sysctl_tcp_fack,
1143		.maxlen		= sizeof(int),
1144		.mode		= 0644,
1145		.proc_handler	= proc_dointvec
1146	},
1147	{
1148		.procname	= "tcp_max_reordering",
1149		.data		= &init_net.ipv4.sysctl_tcp_max_reordering,
1150		.maxlen		= sizeof(int),
1151		.mode		= 0644,
1152		.proc_handler	= proc_dointvec
1153	},
1154	{
1155		.procname	= "tcp_dsack",
1156		.data		= &init_net.ipv4.sysctl_tcp_dsack,
1157		.maxlen		= sizeof(int),
1158		.mode		= 0644,
1159		.proc_handler	= proc_dointvec
1160	},
1161	{
1162		.procname	= "tcp_app_win",
1163		.data		= &init_net.ipv4.sysctl_tcp_app_win,
1164		.maxlen		= sizeof(int),
1165		.mode		= 0644,
1166		.proc_handler	= proc_dointvec
1167	},
1168	{
1169		.procname	= "tcp_adv_win_scale",
1170		.data		= &init_net.ipv4.sysctl_tcp_adv_win_scale,
1171		.maxlen		= sizeof(int),
1172		.mode		= 0644,
1173		.proc_handler	= proc_dointvec_minmax,
1174		.extra1		= &tcp_adv_win_scale_min,
1175		.extra2		= &tcp_adv_win_scale_max,
1176	},
1177	{
1178		.procname	= "tcp_frto",
1179		.data		= &init_net.ipv4.sysctl_tcp_frto,
1180		.maxlen		= sizeof(int),
1181		.mode		= 0644,
1182		.proc_handler	= proc_dointvec
 
 
1183	},
1184	{
1185		.procname	= "tcp_no_metrics_save",
1186		.data		= &init_net.ipv4.sysctl_tcp_nometrics_save,
1187		.maxlen		= sizeof(int),
1188		.mode		= 0644,
1189		.proc_handler	= proc_dointvec,
 
 
1190	},
1191	{
1192		.procname	= "tcp_moderate_rcvbuf",
1193		.data		= &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1194		.maxlen		= sizeof(int),
1195		.mode		= 0644,
1196		.proc_handler	= proc_dointvec,
1197	},
1198	{
1199		.procname	= "tcp_tso_win_divisor",
1200		.data		= &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1201		.maxlen		= sizeof(int),
1202		.mode		= 0644,
1203		.proc_handler	= proc_dointvec,
 
1204	},
1205	{
1206		.procname	= "tcp_workaround_signed_windows",
1207		.data		= &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1208		.maxlen		= sizeof(int),
1209		.mode		= 0644,
1210		.proc_handler	= proc_dointvec
 
1211	},
 
 
 
 
1212	{
1213		.procname	= "tcp_limit_output_bytes",
1214		.data		= &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1215		.maxlen		= sizeof(int),
1216		.mode		= 0644,
1217		.proc_handler	= proc_dointvec
1218	},
1219	{
1220		.procname	= "tcp_challenge_ack_limit",
1221		.data		= &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1222		.maxlen		= sizeof(int),
1223		.mode		= 0644,
1224		.proc_handler	= proc_dointvec
1225	},
1226	{
1227		.procname	= "tcp_min_tso_segs",
1228		.data		= &init_net.ipv4.sysctl_tcp_min_tso_segs,
1229		.maxlen		= sizeof(int),
1230		.mode		= 0644,
1231		.proc_handler	= proc_dointvec_minmax,
1232		.extra1		= SYSCTL_ONE,
1233		.extra2		= &gso_max_segs,
1234	},
1235	{
1236		.procname	= "tcp_min_rtt_wlen",
1237		.data		= &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1238		.maxlen		= sizeof(int),
1239		.mode		= 0644,
1240		.proc_handler	= proc_dointvec_minmax,
1241		.extra1		= SYSCTL_ZERO,
1242		.extra2		= &one_day_secs
1243	},
1244	{
1245		.procname	= "tcp_autocorking",
1246		.data		= &init_net.ipv4.sysctl_tcp_autocorking,
1247		.maxlen		= sizeof(int),
1248		.mode		= 0644,
1249		.proc_handler	= proc_dointvec_minmax,
1250		.extra1		= SYSCTL_ZERO,
1251		.extra2		= SYSCTL_ONE,
1252	},
1253	{
1254		.procname	= "tcp_invalid_ratelimit",
1255		.data		= &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1256		.maxlen		= sizeof(int),
1257		.mode		= 0644,
1258		.proc_handler	= proc_dointvec_ms_jiffies,
1259	},
1260	{
1261		.procname	= "tcp_pacing_ss_ratio",
1262		.data		= &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1263		.maxlen		= sizeof(int),
1264		.mode		= 0644,
1265		.proc_handler	= proc_dointvec_minmax,
1266		.extra1		= SYSCTL_ZERO,
1267		.extra2		= &thousand,
1268	},
1269	{
1270		.procname	= "tcp_pacing_ca_ratio",
1271		.data		= &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1272		.maxlen		= sizeof(int),
1273		.mode		= 0644,
1274		.proc_handler	= proc_dointvec_minmax,
1275		.extra1		= SYSCTL_ZERO,
1276		.extra2		= &thousand,
1277	},
1278	{
1279		.procname	= "tcp_wmem",
1280		.data		= &init_net.ipv4.sysctl_tcp_wmem,
1281		.maxlen		= sizeof(init_net.ipv4.sysctl_tcp_wmem),
1282		.mode		= 0644,
1283		.proc_handler	= proc_dointvec_minmax,
1284		.extra1		= SYSCTL_ONE,
1285	},
1286	{
1287		.procname	= "tcp_rmem",
1288		.data		= &init_net.ipv4.sysctl_tcp_rmem,
1289		.maxlen		= sizeof(init_net.ipv4.sysctl_tcp_rmem),
1290		.mode		= 0644,
1291		.proc_handler	= proc_dointvec_minmax,
1292		.extra1		= SYSCTL_ONE,
1293	},
1294	{
1295		.procname	= "tcp_comp_sack_delay_ns",
1296		.data		= &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1297		.maxlen		= sizeof(unsigned long),
1298		.mode		= 0644,
1299		.proc_handler	= proc_doulongvec_minmax,
1300	},
1301	{
1302		.procname	= "tcp_comp_sack_nr",
1303		.data		= &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1304		.maxlen		= sizeof(int),
1305		.mode		= 0644,
1306		.proc_handler	= proc_dointvec_minmax,
1307		.extra1		= SYSCTL_ZERO,
1308		.extra2		= &comp_sack_nr_max,
1309	},
1310	{
1311		.procname	= "udp_rmem_min",
1312		.data		= &init_net.ipv4.sysctl_udp_rmem_min,
1313		.maxlen		= sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1314		.mode		= 0644,
1315		.proc_handler	= proc_dointvec_minmax,
1316		.extra1		= SYSCTL_ONE
1317	},
1318	{
1319		.procname	= "udp_wmem_min",
1320		.data		= &init_net.ipv4.sysctl_udp_wmem_min,
1321		.maxlen		= sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1322		.mode		= 0644,
1323		.proc_handler	= proc_dointvec_minmax,
1324		.extra1		= SYSCTL_ONE
1325	},
1326	{ }
1327};
1328
1329static __net_init int ipv4_sysctl_init_net(struct net *net)
1330{
1331	struct ctl_table *table;
1332
1333	table = ipv4_net_table;
1334	if (!net_eq(net, &init_net)) {
1335		int i;
1336
1337		table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1338		if (!table)
1339			goto err_alloc;
1340
1341		/* Update the variables to point into the current struct net */
1342		for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1343			table[i].data += (void *)net - (void *)&init_net;
1344	}
1345
1346	net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1347	if (!net->ipv4.ipv4_hdr)
1348		goto err_reg;
1349
1350	net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1351	if (!net->ipv4.sysctl_local_reserved_ports)
1352		goto err_ports;
1353
1354	return 0;
1355
1356err_ports:
1357	unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1358err_reg:
1359	if (!net_eq(net, &init_net))
1360		kfree(table);
1361err_alloc:
1362	return -ENOMEM;
1363}
1364
1365static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1366{
1367	struct ctl_table *table;
1368
1369	kfree(net->ipv4.sysctl_local_reserved_ports);
1370	table = net->ipv4.ipv4_hdr->ctl_table_arg;
1371	unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1372	kfree(table);
1373}
1374
1375static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1376	.init = ipv4_sysctl_init_net,
1377	.exit = ipv4_sysctl_exit_net,
1378};
1379
1380static __init int sysctl_ipv4_init(void)
1381{
1382	struct ctl_table_header *hdr;
 
 
 
 
 
 
 
 
 
 
1383
1384	hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1385	if (!hdr)
1386		return -ENOMEM;
1387
1388	if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1389		unregister_net_sysctl_table(hdr);
1390		return -ENOMEM;
1391	}
1392
1393	return 0;
1394}
1395
1396__initcall(sysctl_ipv4_init);