v4.19.13 snapshot.
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
new file mode 100644
index 0000000..891ed2f
--- /dev/null
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -0,0 +1,1297 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
+ *
+ * Begun April 1, 1996, Mike Shaver.
+ * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
+ */
+
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/sysctl.h>
+#include <linux/igmp.h>
+#include <linux/inetdevice.h>
+#include <linux/seqlock.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/nsproxy.h>
+#include <linux/swap.h>
+#include <net/snmp.h>
+#include <net/icmp.h>
+#include <net/ip.h>
+#include <net/route.h>
+#include <net/tcp.h>
+#include <net/udp.h>
+#include <net/cipso_ipv4.h>
+#include <net/inet_frag.h>
+#include <net/ping.h>
+#include <net/protocol.h>
+#include <net/netevent.h>
+
+static int zero;
+static int one = 1;
+static int two = 2;
+static int four = 4;
+static int thousand = 1000;
+static int gso_max_segs = GSO_MAX_SEGS;
+static int tcp_retr1_max = 255;
+static int ip_local_port_range_min[] = { 1, 1 };
+static int ip_local_port_range_max[] = { 65535, 65535 };
+static int tcp_adv_win_scale_min = -31;
+static int tcp_adv_win_scale_max = 31;
+static int ip_privileged_port_min;
+static int ip_privileged_port_max = 65535;
+static int ip_ttl_min = 1;
+static int ip_ttl_max = 255;
+static int tcp_syn_retries_min = 1;
+static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
+static int ip_ping_group_range_min[] = { 0, 0 };
+static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
+static int comp_sack_nr_max = 255;
+static u32 u32_max_div_HZ = UINT_MAX / HZ;
+
+/* obsolete */
+static int sysctl_tcp_low_latency __read_mostly;
+
+/* Update system visible IP port range */
+static void set_local_port_range(struct net *net, int range[2])
+{
+ bool same_parity = !((range[0] ^ range[1]) & 1);
+
+ write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
+ if (same_parity && !net->ipv4.ip_local_ports.warned) {
+ net->ipv4.ip_local_ports.warned = true;
+ pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
+ }
+ net->ipv4.ip_local_ports.range[0] = range[0];
+ net->ipv4.ip_local_ports.range[1] = range[1];
+ write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
+}
+
+/* Validate changes from /proc interface. */
+static int ipv4_local_port_range(struct ctl_table *table, int write,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ struct net *net =
+ container_of(table->data, struct net, ipv4.ip_local_ports.range);
+ int ret;
+ int range[2];
+ struct ctl_table tmp = {
+ .data = &range,
+ .maxlen = sizeof(range),
+ .mode = table->mode,
+ .extra1 = &ip_local_port_range_min,
+ .extra2 = &ip_local_port_range_max,
+ };
+
+ inet_get_local_port_range(net, &range[0], &range[1]);
+
+ ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
+
+ if (write && ret == 0) {
+ /* Ensure that the upper limit is not smaller than the lower,
+ * and that the lower does not encroach upon the privileged
+ * port limit.
+ */
+ if ((range[1] < range[0]) ||
+ (range[0] < net->ipv4.sysctl_ip_prot_sock))
+ ret = -EINVAL;
+ else
+ set_local_port_range(net, range);
+ }
+
+ return ret;
+}
+
+/* Validate changes from /proc interface. */
+static int ipv4_privileged_ports(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct net *net = container_of(table->data, struct net,
+ ipv4.sysctl_ip_prot_sock);
+ int ret;
+ int pports;
+ int range[2];
+ struct ctl_table tmp = {
+ .data = &pports,
+ .maxlen = sizeof(pports),
+ .mode = table->mode,
+ .extra1 = &ip_privileged_port_min,
+ .extra2 = &ip_privileged_port_max,
+ };
+
+ pports = net->ipv4.sysctl_ip_prot_sock;
+
+ ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
+
+ if (write && ret == 0) {
+ inet_get_local_port_range(net, &range[0], &range[1]);
+ /* Ensure that the local port range doesn't overlap with the
+ * privileged port range.
+ */
+ if (range[0] < pports)
+ ret = -EINVAL;
+ else
+ net->ipv4.sysctl_ip_prot_sock = pports;
+ }
+
+ return ret;
+}
+
+static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
+{
+ kgid_t *data = table->data;
+ struct net *net =
+ container_of(table->data, struct net, ipv4.ping_group_range.range);
+ unsigned int seq;
+ do {
+ seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
+
+ *low = data[0];
+ *high = data[1];
+ } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
+}
+
+/* Update system visible IP port range */
+static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
+{
+ kgid_t *data = table->data;
+ struct net *net =
+ container_of(table->data, struct net, ipv4.ping_group_range.range);
+ write_seqlock(&net->ipv4.ping_group_range.lock);
+ data[0] = low;
+ data[1] = high;
+ write_sequnlock(&net->ipv4.ping_group_range.lock);
+}
+
+/* Validate changes from /proc interface. */
+static int ipv4_ping_group_range(struct ctl_table *table, int write,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ struct user_namespace *user_ns = current_user_ns();
+ int ret;
+ gid_t urange[2];
+ kgid_t low, high;
+ struct ctl_table tmp = {
+ .data = &urange,
+ .maxlen = sizeof(urange),
+ .mode = table->mode,
+ .extra1 = &ip_ping_group_range_min,
+ .extra2 = &ip_ping_group_range_max,
+ };
+
+ inet_get_ping_group_range_table(table, &low, &high);
+ urange[0] = from_kgid_munged(user_ns, low);
+ urange[1] = from_kgid_munged(user_ns, high);
+ ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
+
+ if (write && ret == 0) {
+ low = make_kgid(user_ns, urange[0]);
+ high = make_kgid(user_ns, urange[1]);
+ if (!gid_valid(low) || !gid_valid(high))
+ return -EINVAL;
+ if (urange[1] < urange[0] || gid_lt(high, low)) {
+ low = make_kgid(&init_user_ns, 1);
+ high = make_kgid(&init_user_ns, 0);
+ }
+ set_ping_group_range(table, low, high);
+ }
+
+ return ret;
+}
+
+static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ struct net *net;
+ int ret;
+
+ net = container_of(table->data, struct net,
+ ipv4.sysctl_ip_fwd_update_priority);
+ ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+ if (write && ret == 0)
+ call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
+ net);
+
+ return ret;
+}
+
+static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct net *net = container_of(ctl->data, struct net,
+ ipv4.tcp_congestion_control);
+ char val[TCP_CA_NAME_MAX];
+ struct ctl_table tbl = {
+ .data = val,
+ .maxlen = TCP_CA_NAME_MAX,
+ };
+ int ret;
+
+ tcp_get_default_congestion_control(net, val);
+
+ ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
+ if (write && ret == 0)
+ ret = tcp_set_default_congestion_control(net, val);
+ return ret;
+}
+
+static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
+ int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
+ int ret;
+
+ tbl.data = kmalloc(tbl.maxlen, GFP_USER);
+ if (!tbl.data)
+ return -ENOMEM;
+ tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
+ ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
+ kfree(tbl.data);
+ return ret;
+}
+
+static int proc_allowed_congestion_control(struct ctl_table *ctl,
+ int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
+ int ret;
+
+ tbl.data = kmalloc(tbl.maxlen, GFP_USER);
+ if (!tbl.data)
+ return -ENOMEM;
+
+ tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
+ ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
+ if (write && ret == 0)
+ ret = tcp_set_allowed_congestion_control(tbl.data);
+ kfree(tbl.data);
+ return ret;
+}
+
+static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ struct net *net = container_of(table->data, struct net,
+ ipv4.sysctl_tcp_fastopen);
+ struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
+ struct tcp_fastopen_context *ctxt;
+ u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
+ __le32 key[4];
+ int ret, i;
+
+ tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
+ if (!tbl.data)
+ return -ENOMEM;
+
+ rcu_read_lock();
+ ctxt = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
+ if (ctxt)
+ memcpy(key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
+ else
+ memset(key, 0, sizeof(key));
+ rcu_read_unlock();
+
+ for (i = 0; i < ARRAY_SIZE(key); i++)
+ user_key[i] = le32_to_cpu(key[i]);
+
+ snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
+ user_key[0], user_key[1], user_key[2], user_key[3]);
+ ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
+
+ if (write && ret == 0) {
+ if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
+ user_key + 2, user_key + 3) != 4) {
+ ret = -EINVAL;
+ goto bad_key;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(user_key); i++)
+ key[i] = cpu_to_le32(user_key[i]);
+
+ tcp_fastopen_reset_cipher(net, NULL, key,
+ TCP_FASTOPEN_KEY_LENGTH);
+ }
+
+bad_key:
+ pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
+ user_key[0], user_key[1], user_key[2], user_key[3],
+ (char *)tbl.data, ret);
+ kfree(tbl.data);
+ return ret;
+}
+
+static void proc_configure_early_demux(int enabled, int protocol)
+{
+ struct net_protocol *ipprot;
+#if IS_ENABLED(CONFIG_IPV6)
+ struct inet6_protocol *ip6prot;
+#endif
+
+ rcu_read_lock();
+
+ ipprot = rcu_dereference(inet_protos[protocol]);
+ if (ipprot)
+ ipprot->early_demux = enabled ? ipprot->early_demux_handler :
+ NULL;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ ip6prot = rcu_dereference(inet6_protos[protocol]);
+ if (ip6prot)
+ ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
+ NULL;
+#endif
+ rcu_read_unlock();
+}
+
+static int proc_tcp_early_demux(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int ret = 0;
+
+ ret = proc_dointvec(table, write, buffer, lenp, ppos);
+
+ if (write && !ret) {
+ int enabled = init_net.ipv4.sysctl_tcp_early_demux;
+
+ proc_configure_early_demux(enabled, IPPROTO_TCP);
+ }
+
+ return ret;
+}
+
+static int proc_udp_early_demux(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int ret = 0;
+
+ ret = proc_dointvec(table, write, buffer, lenp, ppos);
+
+ if (write && !ret) {
+ int enabled = init_net.ipv4.sysctl_udp_early_demux;
+
+ proc_configure_early_demux(enabled, IPPROTO_UDP);
+ }
+
+ return ret;
+}
+
+static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
+ int write,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ struct net *net = container_of(table->data, struct net,
+ ipv4.sysctl_tcp_fastopen_blackhole_timeout);
+ int ret;
+
+ ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+ if (write && ret == 0)
+ atomic_set(&net->ipv4.tfo_active_disable_times, 0);
+
+ return ret;
+}
+
+static int proc_tcp_available_ulp(struct ctl_table *ctl,
+ int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
+ int ret;
+
+ tbl.data = kmalloc(tbl.maxlen, GFP_USER);
+ if (!tbl.data)
+ return -ENOMEM;
+ tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
+ ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
+ kfree(tbl.data);
+
+ return ret;
+}
+
+#ifdef CONFIG_IP_ROUTE_MULTIPATH
+static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ struct net *net = container_of(table->data, struct net,
+ ipv4.sysctl_fib_multipath_hash_policy);
+ int ret;
+
+ ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+ if (write && ret == 0)
+ call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
+
+ return ret;
+}
+#endif
+
+static struct ctl_table ipv4_table[] = {
+ {
+ .procname = "tcp_max_orphans",
+ .data = &sysctl_tcp_max_orphans,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "inet_peer_threshold",
+ .data = &inet_peer_threshold,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "inet_peer_minttl",
+ .data = &inet_peer_minttl,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "inet_peer_maxttl",
+ .data = &inet_peer_maxttl,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "tcp_mem",
+ .maxlen = sizeof(sysctl_tcp_mem),
+ .data = &sysctl_tcp_mem,
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ },
+ {
+ .procname = "tcp_low_latency",
+ .data = &sysctl_tcp_low_latency,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+#ifdef CONFIG_NETLABEL
+ {
+ .procname = "cipso_cache_enable",
+ .data = &cipso_v4_cache_enabled,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "cipso_cache_bucket_size",
+ .data = &cipso_v4_cache_bucketsize,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "cipso_rbm_optfmt",
+ .data = &cipso_v4_rbm_optfmt,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "cipso_rbm_strictvalid",
+ .data = &cipso_v4_rbm_strictvalid,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#endif /* CONFIG_NETLABEL */
+ {
+ .procname = "tcp_available_congestion_control",
+ .maxlen = TCP_CA_BUF_MAX,
+ .mode = 0444,
+ .proc_handler = proc_tcp_available_congestion_control,
+ },
+ {
+ .procname = "tcp_allowed_congestion_control",
+ .maxlen = TCP_CA_BUF_MAX,
+ .mode = 0644,
+ .proc_handler = proc_allowed_congestion_control,
+ },
+ {
+ .procname = "tcp_available_ulp",
+ .maxlen = TCP_ULP_BUF_MAX,
+ .mode = 0444,
+ .proc_handler = proc_tcp_available_ulp,
+ },
+ {
+ .procname = "icmp_msgs_per_sec",
+ .data = &sysctl_icmp_msgs_per_sec,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ },
+ {
+ .procname = "icmp_msgs_burst",
+ .data = &sysctl_icmp_msgs_burst,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ },
+ {
+ .procname = "udp_mem",
+ .data = &sysctl_udp_mem,
+ .maxlen = sizeof(sysctl_udp_mem),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ },
+ { }
+};
+
+static struct ctl_table ipv4_net_table[] = {
+ {
+ .procname = "icmp_echo_ignore_all",
+ .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "icmp_echo_ignore_broadcasts",
+ .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "icmp_ignore_bogus_error_responses",
+ .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "icmp_errors_use_inbound_ifaddr",
+ .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "icmp_ratelimit",
+ .data = &init_net.ipv4.sysctl_icmp_ratelimit,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_ms_jiffies,
+ },
+ {
+ .procname = "icmp_ratemask",
+ .data = &init_net.ipv4.sysctl_icmp_ratemask,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "ping_group_range",
+ .data = &init_net.ipv4.ping_group_range.range,
+ .maxlen = sizeof(gid_t)*2,
+ .mode = 0644,
+ .proc_handler = ipv4_ping_group_range,
+ },
+ {
+ .procname = "tcp_ecn",
+ .data = &init_net.ipv4.sysctl_tcp_ecn,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_ecn_fallback",
+ .data = &init_net.ipv4.sysctl_tcp_ecn_fallback,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "ip_dynaddr",
+ .data = &init_net.ipv4.sysctl_ip_dynaddr,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "ip_early_demux",
+ .data = &init_net.ipv4.sysctl_ip_early_demux,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "udp_early_demux",
+ .data = &init_net.ipv4.sysctl_udp_early_demux,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_udp_early_demux
+ },
+ {
+ .procname = "tcp_early_demux",
+ .data = &init_net.ipv4.sysctl_tcp_early_demux,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_tcp_early_demux
+ },
+ {
+ .procname = "ip_default_ttl",
+ .data = &init_net.ipv4.sysctl_ip_default_ttl,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &ip_ttl_min,
+ .extra2 = &ip_ttl_max,
+ },
+ {
+ .procname = "ip_local_port_range",
+ .maxlen = sizeof(init_net.ipv4.ip_local_ports.range),
+ .data = &init_net.ipv4.ip_local_ports.range,
+ .mode = 0644,
+ .proc_handler = ipv4_local_port_range,
+ },
+ {
+ .procname = "ip_local_reserved_ports",
+ .data = &init_net.ipv4.sysctl_local_reserved_ports,
+ .maxlen = 65536,
+ .mode = 0644,
+ .proc_handler = proc_do_large_bitmap,
+ },
+ {
+ .procname = "ip_no_pmtu_disc",
+ .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "ip_forward_use_pmtu",
+ .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "ip_forward_update_priority",
+ .data = &init_net.ipv4.sysctl_ip_fwd_update_priority,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = ipv4_fwd_update_priority,
+ .extra1 = &zero,
+ .extra2 = &one,
+ },
+ {
+ .procname = "ip_nonlocal_bind",
+ .data = &init_net.ipv4.sysctl_ip_nonlocal_bind,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "fwmark_reflect",
+ .data = &init_net.ipv4.sysctl_fwmark_reflect,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "tcp_fwmark_accept",
+ .data = &init_net.ipv4.sysctl_tcp_fwmark_accept,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+#ifdef CONFIG_NET_L3_MASTER_DEV
+ {
+ .procname = "tcp_l3mdev_accept",
+ .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &one,
+ },
+#endif
+ {
+ .procname = "tcp_mtu_probing",
+ .data = &init_net.ipv4.sysctl_tcp_mtu_probing,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "tcp_base_mss",
+ .data = &init_net.ipv4.sysctl_tcp_base_mss,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "tcp_probe_threshold",
+ .data = &init_net.ipv4.sysctl_tcp_probe_threshold,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "tcp_probe_interval",
+ .data = &init_net.ipv4.sysctl_tcp_probe_interval,
+ .maxlen = sizeof(u32),
+ .mode = 0644,
+ .proc_handler = proc_douintvec_minmax,
+ .extra2 = &u32_max_div_HZ,
+ },
+ {
+ .procname = "igmp_link_local_mcast_reports",
+ .data = &init_net.ipv4.sysctl_igmp_llm_reports,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "igmp_max_memberships",
+ .data = &init_net.ipv4.sysctl_igmp_max_memberships,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "igmp_max_msf",
+ .data = &init_net.ipv4.sysctl_igmp_max_msf,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+#ifdef CONFIG_IP_MULTICAST
+ {
+ .procname = "igmp_qrv",
+ .data = &init_net.ipv4.sysctl_igmp_qrv,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &one
+ },
+#endif
+ {
+ .procname = "tcp_congestion_control",
+ .data = &init_net.ipv4.tcp_congestion_control,
+ .mode = 0644,
+ .maxlen = TCP_CA_NAME_MAX,
+ .proc_handler = proc_tcp_congestion_control,
+ },
+ {
+ .procname = "tcp_keepalive_time",
+ .data = &init_net.ipv4.sysctl_tcp_keepalive_time,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "tcp_keepalive_probes",
+ .data = &init_net.ipv4.sysctl_tcp_keepalive_probes,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_keepalive_intvl",
+ .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "tcp_syn_retries",
+ .data = &init_net.ipv4.sysctl_tcp_syn_retries,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &tcp_syn_retries_min,
+ .extra2 = &tcp_syn_retries_max
+ },
+ {
+ .procname = "tcp_synack_retries",
+ .data = &init_net.ipv4.sysctl_tcp_synack_retries,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+#ifdef CONFIG_SYN_COOKIES
+ {
+ .procname = "tcp_syncookies",
+ .data = &init_net.ipv4.sysctl_tcp_syncookies,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+#endif
+ {
+ .procname = "tcp_reordering",
+ .data = &init_net.ipv4.sysctl_tcp_reordering,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_retries1",
+ .data = &init_net.ipv4.sysctl_tcp_retries1,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra2 = &tcp_retr1_max
+ },
+ {
+ .procname = "tcp_retries2",
+ .data = &init_net.ipv4.sysctl_tcp_retries2,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_orphan_retries",
+ .data = &init_net.ipv4.sysctl_tcp_orphan_retries,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_fin_timeout",
+ .data = &init_net.ipv4.sysctl_tcp_fin_timeout,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "tcp_notsent_lowat",
+ .data = &init_net.ipv4.sysctl_tcp_notsent_lowat,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_douintvec,
+ },
+ {
+ .procname = "tcp_tw_reuse",
+ .data = &init_net.ipv4.sysctl_tcp_tw_reuse,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &two,
+ },
+ {
+ .procname = "tcp_max_tw_buckets",
+ .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_max_syn_backlog",
+ .data = &init_net.ipv4.sysctl_max_syn_backlog,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_fastopen",
+ .data = &init_net.ipv4.sysctl_tcp_fastopen,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "tcp_fastopen_key",
+ .mode = 0600,
+ .data = &init_net.ipv4.sysctl_tcp_fastopen,
+ .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
+ .proc_handler = proc_tcp_fastopen_key,
+ },
+ {
+ .procname = "tcp_fastopen_blackhole_timeout_sec",
+ .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_tfo_blackhole_detect_timeout,
+ .extra1 = &zero,
+ },
+#ifdef CONFIG_IP_ROUTE_MULTIPATH
+ {
+ .procname = "fib_multipath_use_neigh",
+ .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &one,
+ },
+ {
+ .procname = "fib_multipath_hash_policy",
+ .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_fib_multipath_hash_policy,
+ .extra1 = &zero,
+ .extra2 = &one,
+ },
+#endif
+ {
+ .procname = "ip_unprivileged_port_start",
+ .maxlen = sizeof(int),
+ .data = &init_net.ipv4.sysctl_ip_prot_sock,
+ .mode = 0644,
+ .proc_handler = ipv4_privileged_ports,
+ },
+#ifdef CONFIG_NET_L3_MASTER_DEV
+ {
+ .procname = "udp_l3mdev_accept",
+ .data = &init_net.ipv4.sysctl_udp_l3mdev_accept,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &one,
+ },
+#endif
+ {
+ .procname = "tcp_sack",
+ .data = &init_net.ipv4.sysctl_tcp_sack,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_window_scaling",
+ .data = &init_net.ipv4.sysctl_tcp_window_scaling,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_timestamps",
+ .data = &init_net.ipv4.sysctl_tcp_timestamps,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_early_retrans",
+ .data = &init_net.ipv4.sysctl_tcp_early_retrans,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &four,
+ },
+ {
+ .procname = "tcp_recovery",
+ .data = &init_net.ipv4.sysctl_tcp_recovery,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "tcp_thin_linear_timeouts",
+ .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_slow_start_after_idle",
+ .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_retrans_collapse",
+ .data = &init_net.ipv4.sysctl_tcp_retrans_collapse,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_stdurg",
+ .data = &init_net.ipv4.sysctl_tcp_stdurg,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_rfc1337",
+ .data = &init_net.ipv4.sysctl_tcp_rfc1337,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_abort_on_overflow",
+ .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_fack",
+ .data = &init_net.ipv4.sysctl_tcp_fack,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_max_reordering",
+ .data = &init_net.ipv4.sysctl_tcp_max_reordering,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_dsack",
+ .data = &init_net.ipv4.sysctl_tcp_dsack,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_app_win",
+ .data = &init_net.ipv4.sysctl_tcp_app_win,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_adv_win_scale",
+ .data = &init_net.ipv4.sysctl_tcp_adv_win_scale,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &tcp_adv_win_scale_min,
+ .extra2 = &tcp_adv_win_scale_max,
+ },
+ {
+ .procname = "tcp_frto",
+ .data = &init_net.ipv4.sysctl_tcp_frto,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_no_metrics_save",
+ .data = &init_net.ipv4.sysctl_tcp_nometrics_save,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "tcp_moderate_rcvbuf",
+ .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "tcp_tso_win_divisor",
+ .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ },
+ {
+ .procname = "tcp_workaround_signed_windows",
+ .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_limit_output_bytes",
+ .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_challenge_ack_limit",
+ .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_min_tso_segs",
+ .data = &init_net.ipv4.sysctl_tcp_min_tso_segs,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &one,
+ .extra2 = &gso_max_segs,
+ },
+ {
+ .procname = "tcp_min_rtt_wlen",
+ .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
+ {
+ .procname = "tcp_autocorking",
+ .data = &init_net.ipv4.sysctl_tcp_autocorking,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &one,
+ },
+ {
+ .procname = "tcp_invalid_ratelimit",
+ .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_ms_jiffies,
+ },
+ {
+ .procname = "tcp_pacing_ss_ratio",
+ .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &thousand,
+ },
+ {
+ .procname = "tcp_pacing_ca_ratio",
+ .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &thousand,
+ },
+ {
+ .procname = "tcp_wmem",
+ .data = &init_net.ipv4.sysctl_tcp_wmem,
+ .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &one,
+ },
+ {
+ .procname = "tcp_rmem",
+ .data = &init_net.ipv4.sysctl_tcp_rmem,
+ .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &one,
+ },
+ {
+ .procname = "tcp_comp_sack_delay_ns",
+ .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
+ .maxlen = sizeof(unsigned long),
+ .mode = 0644,
+ .proc_handler = proc_doulongvec_minmax,
+ },
+ {
+ .procname = "tcp_comp_sack_nr",
+ .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &comp_sack_nr_max,
+ },
+ {
+ .procname = "udp_rmem_min",
+ .data = &init_net.ipv4.sysctl_udp_rmem_min,
+ .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &one
+ },
+ {
+ .procname = "udp_wmem_min",
+ .data = &init_net.ipv4.sysctl_udp_wmem_min,
+ .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &one
+ },
+ { }
+};
+
+static __net_init int ipv4_sysctl_init_net(struct net *net)
+{
+ struct ctl_table *table;
+
+ table = ipv4_net_table;
+ if (!net_eq(net, &init_net)) {
+ int i;
+
+ table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
+ if (!table)
+ goto err_alloc;
+
+ /* Update the variables to point into the current struct net */
+ for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
+ table[i].data += (void *)net - (void *)&init_net;
+ }
+
+ net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
+ if (!net->ipv4.ipv4_hdr)
+ goto err_reg;
+
+ net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
+ if (!net->ipv4.sysctl_local_reserved_ports)
+ goto err_ports;
+
+ return 0;
+
+err_ports:
+ unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
+err_reg:
+ if (!net_eq(net, &init_net))
+ kfree(table);
+err_alloc:
+ return -ENOMEM;
+}
+
+static __net_exit void ipv4_sysctl_exit_net(struct net *net)
+{
+ struct ctl_table *table;
+
+ kfree(net->ipv4.sysctl_local_reserved_ports);
+ table = net->ipv4.ipv4_hdr->ctl_table_arg;
+ unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
+ kfree(table);
+}
+
+static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
+ .init = ipv4_sysctl_init_net,
+ .exit = ipv4_sysctl_exit_net,
+};
+
+static __init int sysctl_ipv4_init(void)
+{
+ struct ctl_table_header *hdr;
+
+ hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
+ if (!hdr)
+ return -ENOMEM;
+
+ if (register_pernet_subsys(&ipv4_sysctl_ops)) {
+ unregister_net_sysctl_table(hdr);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+__initcall(sysctl_ipv4_init);