675 lines
16 KiB
C
675 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* -*- linux-c -*-
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* sysctl_net_core.c: sysctl interface to net core subsystem.
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*
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* Begun April 1, 1996, Mike Shaver.
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* Added /proc/sys/net/core directory entry (empty =) ). [MS]
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*/
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#include <linux/mm.h>
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#include <linux/sysctl.h>
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#include <linux/module.h>
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#include <linux/socket.h>
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#include <linux/netdevice.h>
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#include <linux/ratelimit.h>
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#include <linux/vmalloc.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <net/ip.h>
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#include <net/sock.h>
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#include <net/net_ratelimit.h>
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#include <net/busy_poll.h>
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#include <net/pkt_sched.h>
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#include <net/inet_connection_sock.h>
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static int two __maybe_unused = 2;
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static int min_sndbuf = SOCK_MIN_SNDBUF;
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static int min_rcvbuf = SOCK_MIN_RCVBUF;
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static int max_skb_frags = MAX_SKB_FRAGS;
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static long long_one __maybe_unused = 1;
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static long long_max __maybe_unused = LONG_MAX;
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static int net_msg_warn; /* Unused, but still a sysctl */
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int sysctl_fb_tunnels_only_for_init_net __read_mostly = 0;
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EXPORT_SYMBOL(sysctl_fb_tunnels_only_for_init_net);
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/* 0 - Keep current behavior:
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* IPv4: inherit all current settings from init_net
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* IPv6: reset all settings to default
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* 1 - Both inherit all current settings from init_net
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* 2 - Both reset all settings to default
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*/
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int sysctl_devconf_inherit_init_net __read_mostly;
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EXPORT_SYMBOL(sysctl_devconf_inherit_init_net);
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#ifdef CONFIG_RPS
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static int rps_sock_flow_sysctl(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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unsigned int orig_size, size;
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int ret, i;
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struct ctl_table tmp = {
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.data = &size,
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.maxlen = sizeof(size),
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.mode = table->mode
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};
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struct rps_sock_flow_table *orig_sock_table, *sock_table;
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static DEFINE_MUTEX(sock_flow_mutex);
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mutex_lock(&sock_flow_mutex);
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orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
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lockdep_is_held(&sock_flow_mutex));
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size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
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ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
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if (write) {
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if (size) {
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if (size > 1<<29) {
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/* Enforce limit to prevent overflow */
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mutex_unlock(&sock_flow_mutex);
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return -EINVAL;
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}
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size = roundup_pow_of_two(size);
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if (size != orig_size) {
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sock_table =
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vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
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if (!sock_table) {
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mutex_unlock(&sock_flow_mutex);
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return -ENOMEM;
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}
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rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1;
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sock_table->mask = size - 1;
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} else
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sock_table = orig_sock_table;
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for (i = 0; i < size; i++)
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sock_table->ents[i] = RPS_NO_CPU;
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} else
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sock_table = NULL;
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if (sock_table != orig_sock_table) {
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rcu_assign_pointer(rps_sock_flow_table, sock_table);
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if (sock_table) {
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static_branch_inc(&rps_needed);
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static_branch_inc(&rfs_needed);
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}
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if (orig_sock_table) {
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static_branch_dec(&rps_needed);
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static_branch_dec(&rfs_needed);
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synchronize_rcu();
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vfree(orig_sock_table);
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}
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}
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}
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mutex_unlock(&sock_flow_mutex);
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return ret;
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}
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#endif /* CONFIG_RPS */
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#ifdef CONFIG_NET_FLOW_LIMIT
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static DEFINE_MUTEX(flow_limit_update_mutex);
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static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
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struct sd_flow_limit *cur;
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struct softnet_data *sd;
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cpumask_var_t mask;
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int i, len, ret = 0;
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if (!alloc_cpumask_var(&mask, GFP_KERNEL))
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return -ENOMEM;
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if (write) {
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ret = cpumask_parse_user(buffer, *lenp, mask);
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if (ret)
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goto done;
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mutex_lock(&flow_limit_update_mutex);
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len = sizeof(*cur) + netdev_flow_limit_table_len;
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for_each_possible_cpu(i) {
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sd = &per_cpu(softnet_data, i);
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cur = rcu_dereference_protected(sd->flow_limit,
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lockdep_is_held(&flow_limit_update_mutex));
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if (cur && !cpumask_test_cpu(i, mask)) {
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RCU_INIT_POINTER(sd->flow_limit, NULL);
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synchronize_rcu();
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kfree(cur);
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} else if (!cur && cpumask_test_cpu(i, mask)) {
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cur = kzalloc_node(len, GFP_KERNEL,
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cpu_to_node(i));
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if (!cur) {
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/* not unwinding previous changes */
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ret = -ENOMEM;
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goto write_unlock;
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}
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cur->num_buckets = netdev_flow_limit_table_len;
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rcu_assign_pointer(sd->flow_limit, cur);
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}
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}
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write_unlock:
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mutex_unlock(&flow_limit_update_mutex);
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} else {
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char kbuf[128];
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if (*ppos || !*lenp) {
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*lenp = 0;
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goto done;
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}
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cpumask_clear(mask);
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rcu_read_lock();
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for_each_possible_cpu(i) {
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sd = &per_cpu(softnet_data, i);
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if (rcu_dereference(sd->flow_limit))
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cpumask_set_cpu(i, mask);
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}
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rcu_read_unlock();
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len = min(sizeof(kbuf) - 1, *lenp);
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len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
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if (!len) {
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*lenp = 0;
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goto done;
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}
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if (len < *lenp)
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kbuf[len++] = '\n';
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if (copy_to_user(buffer, kbuf, len)) {
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ret = -EFAULT;
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goto done;
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}
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*lenp = len;
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*ppos += len;
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}
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done:
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free_cpumask_var(mask);
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return ret;
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}
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static int flow_limit_table_len_sysctl(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
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unsigned int old, *ptr;
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int ret;
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mutex_lock(&flow_limit_update_mutex);
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ptr = table->data;
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old = *ptr;
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ret = proc_dointvec(table, write, buffer, lenp, ppos);
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if (!ret && write && !is_power_of_2(*ptr)) {
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*ptr = old;
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ret = -EINVAL;
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}
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mutex_unlock(&flow_limit_update_mutex);
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return ret;
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}
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#endif /* CONFIG_NET_FLOW_LIMIT */
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#ifdef CONFIG_NET_SCHED
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static int set_default_qdisc(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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char id[IFNAMSIZ];
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struct ctl_table tbl = {
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.data = id,
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.maxlen = IFNAMSIZ,
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};
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int ret;
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qdisc_get_default(id, IFNAMSIZ);
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ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
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if (write && ret == 0)
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ret = qdisc_set_default(id);
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return ret;
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}
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#endif
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static int proc_do_dev_weight(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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static DEFINE_MUTEX(dev_weight_mutex);
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int ret, weight;
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mutex_lock(&dev_weight_mutex);
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ret = proc_dointvec(table, write, buffer, lenp, ppos);
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if (!ret && write) {
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weight = READ_ONCE(weight_p);
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WRITE_ONCE(dev_rx_weight, weight * dev_weight_rx_bias);
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WRITE_ONCE(dev_tx_weight, weight * dev_weight_tx_bias);
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}
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mutex_unlock(&dev_weight_mutex);
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return ret;
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}
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static int proc_do_rss_key(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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struct ctl_table fake_table;
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char buf[NETDEV_RSS_KEY_LEN * 3];
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snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key);
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fake_table.data = buf;
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fake_table.maxlen = sizeof(buf);
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return proc_dostring(&fake_table, write, buffer, lenp, ppos);
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}
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#ifdef CONFIG_BPF_JIT
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static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
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int ret, jit_enable = *(int *)table->data;
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struct ctl_table tmp = *table;
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if (write && !capable(CAP_SYS_ADMIN))
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return -EPERM;
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tmp.data = &jit_enable;
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ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
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if (write && !ret) {
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if (jit_enable < 2 ||
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(jit_enable == 2 && bpf_dump_raw_ok(current_cred()))) {
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*(int *)table->data = jit_enable;
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if (jit_enable == 2)
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pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n");
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} else {
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ret = -EPERM;
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}
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}
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return ret;
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}
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# ifdef CONFIG_HAVE_EBPF_JIT
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static int
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proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
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}
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# endif /* CONFIG_HAVE_EBPF_JIT */
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static int
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proc_dolongvec_minmax_bpf_restricted(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp,
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loff_t *ppos)
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{
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
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}
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#endif
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static struct ctl_table net_core_table[] = {
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#ifdef CONFIG_NET
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{
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.procname = "wmem_max",
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.data = &sysctl_wmem_max,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_sndbuf,
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},
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{
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.procname = "rmem_max",
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.data = &sysctl_rmem_max,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_rcvbuf,
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},
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{
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.procname = "wmem_default",
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.data = &sysctl_wmem_default,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_sndbuf,
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},
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{
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.procname = "rmem_default",
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.data = &sysctl_rmem_default,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &min_rcvbuf,
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},
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{
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.procname = "dev_weight",
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.data = &weight_p,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_do_dev_weight,
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},
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{
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.procname = "dev_weight_rx_bias",
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.data = &dev_weight_rx_bias,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_do_dev_weight,
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},
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{
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.procname = "dev_weight_tx_bias",
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.data = &dev_weight_tx_bias,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_do_dev_weight,
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},
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{
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.procname = "netdev_max_backlog",
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.data = &netdev_max_backlog,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "netdev_rss_key",
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.data = &netdev_rss_key,
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.maxlen = sizeof(int),
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.mode = 0444,
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.proc_handler = proc_do_rss_key,
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},
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#ifdef CONFIG_BPF_JIT
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{
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.procname = "bpf_jit_enable",
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.data = &bpf_jit_enable,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax_bpf_enable,
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# ifdef CONFIG_BPF_JIT_ALWAYS_ON
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.extra1 = SYSCTL_ONE,
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.extra2 = SYSCTL_ONE,
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# else
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.extra1 = SYSCTL_ZERO,
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.extra2 = &two,
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# endif
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},
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# ifdef CONFIG_HAVE_EBPF_JIT
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{
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.procname = "bpf_jit_harden",
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.data = &bpf_jit_harden,
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.maxlen = sizeof(int),
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.mode = 0600,
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.proc_handler = proc_dointvec_minmax_bpf_restricted,
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.extra1 = SYSCTL_ZERO,
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.extra2 = &two,
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},
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{
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.procname = "bpf_jit_kallsyms",
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.data = &bpf_jit_kallsyms,
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.maxlen = sizeof(int),
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.mode = 0600,
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.proc_handler = proc_dointvec_minmax_bpf_restricted,
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.extra1 = SYSCTL_ZERO,
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.extra2 = SYSCTL_ONE,
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},
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# endif
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{
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.procname = "bpf_jit_limit",
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.data = &bpf_jit_limit,
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.maxlen = sizeof(long),
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.mode = 0600,
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.proc_handler = proc_dolongvec_minmax_bpf_restricted,
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.extra1 = &long_one,
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.extra2 = &bpf_jit_limit_max,
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},
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#endif
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{
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.procname = "netdev_tstamp_prequeue",
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.data = &netdev_tstamp_prequeue,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "message_cost",
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.data = &net_ratelimit_state.interval,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_jiffies,
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},
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{
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.procname = "message_burst",
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.data = &net_ratelimit_state.burst,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "optmem_max",
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.data = &sysctl_optmem_max,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "tstamp_allow_data",
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.data = &sysctl_tstamp_allow_data,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = SYSCTL_ZERO,
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.extra2 = SYSCTL_ONE
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},
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#ifdef CONFIG_RPS
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{
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.procname = "rps_sock_flow_entries",
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = rps_sock_flow_sysctl
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},
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#endif
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#ifdef CONFIG_NET_FLOW_LIMIT
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{
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.procname = "flow_limit_cpu_bitmap",
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.mode = 0644,
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.proc_handler = flow_limit_cpu_sysctl
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},
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{
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.procname = "flow_limit_table_len",
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.data = &netdev_flow_limit_table_len,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = flow_limit_table_len_sysctl
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},
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#endif /* CONFIG_NET_FLOW_LIMIT */
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#ifdef CONFIG_NET_RX_BUSY_POLL
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{
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.procname = "busy_poll",
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.data = &sysctl_net_busy_poll,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = SYSCTL_ZERO,
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},
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{
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.procname = "busy_read",
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.data = &sysctl_net_busy_read,
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.maxlen = sizeof(unsigned int),
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.mode = 0644,
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|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
},
|
|
#endif
|
|
#ifdef CONFIG_NET_SCHED
|
|
{
|
|
.procname = "default_qdisc",
|
|
.mode = 0644,
|
|
.maxlen = IFNAMSIZ,
|
|
.proc_handler = set_default_qdisc
|
|
},
|
|
#endif
|
|
#endif /* CONFIG_NET */
|
|
{
|
|
.procname = "netdev_budget",
|
|
.data = &netdev_budget,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "warnings",
|
|
.data = &net_msg_warn,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "max_skb_frags",
|
|
.data = &sysctl_max_skb_frags,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ONE,
|
|
.extra2 = &max_skb_frags,
|
|
},
|
|
{
|
|
.procname = "netdev_budget_usecs",
|
|
.data = &netdev_budget_usecs,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
},
|
|
{
|
|
.procname = "fb_tunnels_only_for_init_net",
|
|
.data = &sysctl_fb_tunnels_only_for_init_net,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_ONE,
|
|
},
|
|
{
|
|
.procname = "devconf_inherit_init_net",
|
|
.data = &sysctl_devconf_inherit_init_net,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = &two,
|
|
},
|
|
{
|
|
.procname = "high_order_alloc_disable",
|
|
.data = &net_high_order_alloc_disable_key.key,
|
|
.maxlen = sizeof(net_high_order_alloc_disable_key),
|
|
.mode = 0644,
|
|
.proc_handler = proc_do_static_key,
|
|
},
|
|
{
|
|
.procname = "gro_normal_batch",
|
|
.data = &gro_normal_batch,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ONE,
|
|
},
|
|
{
|
|
.procname = "netdev_pagefrag_enabled",
|
|
.data = &netdev_pagefrag_enabled,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_pingpong_thresh",
|
|
.data = &sysctl_tcp_pingpong_thresh,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
},
|
|
{
|
|
.procname = "forced_caps_enabled",
|
|
.data = &sysctl_forced_caps_enabled,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_ONE,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table netns_core_table[] = {
|
|
{
|
|
.procname = "somaxconn",
|
|
.data = &init_net.core.sysctl_somaxconn,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.proc_handler = proc_dointvec_minmax
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static __net_init int sysctl_core_net_init(struct net *net)
|
|
{
|
|
struct ctl_table *tbl;
|
|
|
|
tbl = netns_core_table;
|
|
if (!net_eq(net, &init_net)) {
|
|
tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
|
|
if (tbl == NULL)
|
|
goto err_dup;
|
|
|
|
tbl[0].data = &net->core.sysctl_somaxconn;
|
|
|
|
/* Don't export any sysctls to unprivileged users */
|
|
if (net->user_ns != &init_user_ns) {
|
|
tbl[0].procname = NULL;
|
|
}
|
|
}
|
|
|
|
net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
|
|
if (net->core.sysctl_hdr == NULL)
|
|
goto err_reg;
|
|
|
|
return 0;
|
|
|
|
err_reg:
|
|
if (tbl != netns_core_table)
|
|
kfree(tbl);
|
|
err_dup:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static __net_exit void sysctl_core_net_exit(struct net *net)
|
|
{
|
|
struct ctl_table *tbl;
|
|
|
|
tbl = net->core.sysctl_hdr->ctl_table_arg;
|
|
unregister_net_sysctl_table(net->core.sysctl_hdr);
|
|
BUG_ON(tbl == netns_core_table);
|
|
kfree(tbl);
|
|
}
|
|
|
|
static __net_initdata struct pernet_operations sysctl_core_ops = {
|
|
.init = sysctl_core_net_init,
|
|
.exit = sysctl_core_net_exit,
|
|
};
|
|
|
|
static __init int sysctl_core_init(void)
|
|
{
|
|
register_net_sysctl(&init_net, "net/core", net_core_table);
|
|
return register_pernet_subsys(&sysctl_core_ops);
|
|
}
|
|
|
|
fs_initcall(sysctl_core_init);
|