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d631094e4d
linux/net/core/sysctl_net_core.c
Antoine Tenart d631094e4d net: sysctl: remove always-true condition 
Before adding a new line at the end of the temporary buffer in
dump_cpumask, a length check is performed to ensure there is space for
it.

  len = min(sizeof(kbuf) - 1, *lenp);
  len = scnprintf(kbuf, len, ...);
  if (len < *lenp)
          kbuf[len++] = '\n';

Note that the check is currently logically wrong, the written length is
compared against the output buffer, not the temporary one. However this
has no consequence as this is always true, even if fixed: scnprintf
includes a null char at the end of the buffer but the returned length do
not include it and there is always space for overriding it with a
newline.

Remove the condition.

Signed-off-by: Antoine Tenart <atenart@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2024-10-23 10:28:19 +02:00

780 lines
18 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0
/* -*- linux-c -*-
* sysctl_net_core.c: sysctl interface to net core subsystem.
*
* Begun April 1, 1996, Mike Shaver.
* Added /proc/sys/net/core directory entry (empty =) ). [MS]
*/
#include <linux/filter.h>
#include <linux/mm.h>
#include <linux/sysctl.h>
#include <linux/module.h>
#include <linux/socket.h>
#include <linux/netdevice.h>
#include <linux/ratelimit.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/sched/isolation.h>
#include <net/ip.h>
#include <net/sock.h>
#include <net/net_ratelimit.h>
#include <net/busy_poll.h>
#include <net/pkt_sched.h>
#include <net/hotdata.h>
#include <net/proto_memory.h>
#include <net/rps.h>
#include "dev.h"
static int int_3600 = 3600;
static int min_sndbuf = SOCK_MIN_SNDBUF;
static int min_rcvbuf = SOCK_MIN_RCVBUF;
static int max_skb_frags = MAX_SKB_FRAGS;
static int min_mem_pcpu_rsv = SK_MEMORY_PCPU_RESERVE;
static int net_msg_warn; /* Unused, but still a sysctl */
int sysctl_fb_tunnels_only_for_init_net __read_mostly = 0;
EXPORT_SYMBOL(sysctl_fb_tunnels_only_for_init_net);
/* 0 - Keep current behavior:
* IPv4: inherit all current settings from init_net
* IPv6: reset all settings to default
* 1 - Both inherit all current settings from init_net
* 2 - Both reset all settings to default
* 3 - Both inherit all settings from current netns
*/
int sysctl_devconf_inherit_init_net __read_mostly;
EXPORT_SYMBOL(sysctl_devconf_inherit_init_net);
#if IS_ENABLED(CONFIG_NET_FLOW_LIMIT) || IS_ENABLED(CONFIG_RPS)
static void dump_cpumask(void *buffer, size_t *lenp, loff_t *ppos,
struct cpumask *mask)
{
char kbuf[128];
int len;
if (*ppos || !*lenp) {
*lenp = 0;
return;
}
len = min(sizeof(kbuf) - 1, *lenp);
len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask));
if (!len) {
*lenp = 0;
return;
}
/* scnprintf writes a trailing null char not counted in the returned
* length, override it with a newline.
*/
kbuf[len++] = '\n';
memcpy(buffer, kbuf, len);
*lenp = len;
*ppos += len;
}
#endif
#ifdef CONFIG_RPS
static struct cpumask *rps_default_mask_cow_alloc(struct net *net)
{
struct cpumask *rps_default_mask;
if (net->core.rps_default_mask)
return net->core.rps_default_mask;
rps_default_mask = kzalloc(cpumask_size(), GFP_KERNEL);
if (!rps_default_mask)
return NULL;
/* pairs with READ_ONCE in rx_queue_default_mask() */
WRITE_ONCE(net->core.rps_default_mask, rps_default_mask);
return rps_default_mask;
}
static int rps_default_mask_sysctl(const struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
struct net *net = (struct net *)table->data;
int err = 0;
rtnl_lock();
if (write) {
struct cpumask *rps_default_mask = rps_default_mask_cow_alloc(net);
err = -ENOMEM;
if (!rps_default_mask)
goto done;
err = cpumask_parse(buffer, rps_default_mask);
if (err)
goto done;
err = rps_cpumask_housekeeping(rps_default_mask);
if (err)
goto done;
} else {
dump_cpumask(buffer, lenp, ppos,
net->core.rps_default_mask ? : cpu_none_mask);
}
done:
rtnl_unlock();
return err;
}
static int rps_sock_flow_sysctl(const struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
unsigned int orig_size, size;
int ret, i;
struct ctl_table tmp = {
.data = &size,
.maxlen = sizeof(size),
.mode = table->mode
};
struct rps_sock_flow_table *orig_sock_table, *sock_table;
static DEFINE_MUTEX(sock_flow_mutex);
mutex_lock(&sock_flow_mutex);
orig_sock_table = rcu_dereference_protected(
net_hotdata.rps_sock_flow_table,
lockdep_is_held(&sock_flow_mutex));
size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);
if (write) {
if (size) {
if (size > 1<<29) {
/* Enforce limit to prevent overflow */
mutex_unlock(&sock_flow_mutex);
return -EINVAL;
}
size = roundup_pow_of_two(size);
if (size != orig_size) {
sock_table =
vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size));
if (!sock_table) {
mutex_unlock(&sock_flow_mutex);
return -ENOMEM;
}
net_hotdata.rps_cpu_mask =
roundup_pow_of_two(nr_cpu_ids) - 1;
sock_table->mask = size - 1;
} else
sock_table = orig_sock_table;
for (i = 0; i < size; i++)
sock_table->ents[i] = RPS_NO_CPU;
} else
sock_table = NULL;
if (sock_table != orig_sock_table) {
rcu_assign_pointer(net_hotdata.rps_sock_flow_table,
sock_table);
if (sock_table) {
static_branch_inc(&rps_needed);
static_branch_inc(&rfs_needed);
}
if (orig_sock_table) {
static_branch_dec(&rps_needed);
static_branch_dec(&rfs_needed);
kvfree_rcu_mightsleep(orig_sock_table);
}
}
}
mutex_unlock(&sock_flow_mutex);
return ret;
}
#endif /* CONFIG_RPS */
#ifdef CONFIG_NET_FLOW_LIMIT
static DEFINE_MUTEX(flow_limit_update_mutex);
static int flow_limit_cpu_sysctl(const struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
struct sd_flow_limit *cur;
struct softnet_data *sd;
cpumask_var_t mask;
int i, len, ret = 0;
if (!alloc_cpumask_var(&mask, GFP_KERNEL))
return -ENOMEM;
if (write) {
ret = cpumask_parse(buffer, mask);
if (ret)
goto done;
mutex_lock(&flow_limit_update_mutex);
len = sizeof(*cur) + netdev_flow_limit_table_len;
for_each_possible_cpu(i) {
sd = &per_cpu(softnet_data, i);
cur = rcu_dereference_protected(sd->flow_limit,
lockdep_is_held(&flow_limit_update_mutex));
if (cur && !cpumask_test_cpu(i, mask)) {
RCU_INIT_POINTER(sd->flow_limit, NULL);
kfree_rcu_mightsleep(cur);
} else if (!cur && cpumask_test_cpu(i, mask)) {
cur = kzalloc_node(len, GFP_KERNEL,
cpu_to_node(i));
if (!cur) {
/* not unwinding previous changes */
ret = -ENOMEM;
goto write_unlock;
}
cur->num_buckets = netdev_flow_limit_table_len;
rcu_assign_pointer(sd->flow_limit, cur);
}
}
write_unlock:
mutex_unlock(&flow_limit_update_mutex);
} else {
cpumask_clear(mask);
rcu_read_lock();
for_each_possible_cpu(i) {
sd = &per_cpu(softnet_data, i);
if (rcu_dereference(sd->flow_limit))
cpumask_set_cpu(i, mask);
}
rcu_read_unlock();
dump_cpumask(buffer, lenp, ppos, mask);
}
done:
free_cpumask_var(mask);
return ret;
}
static int flow_limit_table_len_sysctl(const struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
unsigned int old, *ptr;
int ret;
mutex_lock(&flow_limit_update_mutex);
ptr = table->data;
old = *ptr;
ret = proc_dointvec(table, write, buffer, lenp, ppos);
if (!ret && write && !is_power_of_2(*ptr)) {
*ptr = old;
ret = -EINVAL;
}
mutex_unlock(&flow_limit_update_mutex);
return ret;
}
#endif /* CONFIG_NET_FLOW_LIMIT */
#ifdef CONFIG_NET_SCHED
static int set_default_qdisc(const struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
char id[IFNAMSIZ];
struct ctl_table tbl = {
.data = id,
.maxlen = IFNAMSIZ,
};
int ret;
qdisc_get_default(id, IFNAMSIZ);
ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
if (write && ret == 0)
ret = qdisc_set_default(id);
return ret;
}
#endif
static int proc_do_dev_weight(const struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
static DEFINE_MUTEX(dev_weight_mutex);
int ret, weight;
mutex_lock(&dev_weight_mutex);
ret = proc_dointvec(table, write, buffer, lenp, ppos);
if (!ret && write) {
weight = READ_ONCE(weight_p);
WRITE_ONCE(net_hotdata.dev_rx_weight, weight * dev_weight_rx_bias);
WRITE_ONCE(net_hotdata.dev_tx_weight, weight * dev_weight_tx_bias);
}
mutex_unlock(&dev_weight_mutex);
return ret;
}
static int proc_do_rss_key(const struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
struct ctl_table fake_table;
char buf[NETDEV_RSS_KEY_LEN * 3];
snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key);
fake_table.data = buf;
fake_table.maxlen = sizeof(buf);
return proc_dostring(&fake_table, write, buffer, lenp, ppos);
}
#ifdef CONFIG_BPF_JIT
static int proc_dointvec_minmax_bpf_enable(const struct ctl_table *table, int write,
void *buffer, size_t *lenp,
loff_t *ppos)
{
int ret, jit_enable = *(int *)table->data;
int min = *(int *)table->extra1;
int max = *(int *)table->extra2;
struct ctl_table tmp = *table;
if (write && !capable(CAP_SYS_ADMIN))
return -EPERM;
tmp.data = &jit_enable;
ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
if (write && !ret) {
if (jit_enable < 2 ||
(jit_enable == 2 && bpf_dump_raw_ok(current_cred()))) {
*(int *)table->data = jit_enable;
if (jit_enable == 2)
pr_warn("bpf_jit_enable = 2 was set! NEVER use this in production, only for JIT debugging!\n");
} else {
ret = -EPERM;
}
}
if (write && ret && min == max)
pr_info_once("CONFIG_BPF_JIT_ALWAYS_ON is enabled, bpf_jit_enable is permanently set to 1.\n");
return ret;
}
# ifdef CONFIG_HAVE_EBPF_JIT
static int
proc_dointvec_minmax_bpf_restricted(const struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
}
# endif /* CONFIG_HAVE_EBPF_JIT */
static int
proc_dolongvec_minmax_bpf_restricted(const struct ctl_table *table, int write,
void *buffer, size_t *lenp, loff_t *ppos)
{
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
}
#endif
static struct ctl_table net_core_table[] = {
{
.procname = "mem_pcpu_rsv",
.data = &net_hotdata.sysctl_mem_pcpu_rsv,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_mem_pcpu_rsv,
},
{
.procname = "dev_weight",
.data = &weight_p,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_do_dev_weight,
},
{
.procname = "dev_weight_rx_bias",
.data = &dev_weight_rx_bias,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_do_dev_weight,
},
{
.procname = "dev_weight_tx_bias",
.data = &dev_weight_tx_bias,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_do_dev_weight,
},
{
.procname = "netdev_max_backlog",
.data = &net_hotdata.max_backlog,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "netdev_rss_key",
.data = &netdev_rss_key,
.maxlen = sizeof(int),
.mode = 0444,
.proc_handler = proc_do_rss_key,
},
#ifdef CONFIG_BPF_JIT
{
.procname = "bpf_jit_enable",
.data = &bpf_jit_enable,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax_bpf_enable,
# ifdef CONFIG_BPF_JIT_ALWAYS_ON
.extra1 = SYSCTL_ONE,
.extra2 = SYSCTL_ONE,
# else
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_TWO,
# endif
},
# ifdef CONFIG_HAVE_EBPF_JIT
{
.procname = "bpf_jit_harden",
.data = &bpf_jit_harden,
.maxlen = sizeof(int),
.mode = 0600,
.proc_handler = proc_dointvec_minmax_bpf_restricted,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_TWO,
},
{
.procname = "bpf_jit_kallsyms",
.data = &bpf_jit_kallsyms,
.maxlen = sizeof(int),
.mode = 0600,
.proc_handler = proc_dointvec_minmax_bpf_restricted,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
# endif
{
.procname = "bpf_jit_limit",
.data = &bpf_jit_limit,
.maxlen = sizeof(long),
.mode = 0600,
.proc_handler = proc_dolongvec_minmax_bpf_restricted,
.extra1 = SYSCTL_LONG_ONE,
.extra2 = &bpf_jit_limit_max,
},
#endif
{
.procname = "netdev_tstamp_prequeue",
.data = &net_hotdata.tstamp_prequeue,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "message_cost",
.data = &net_ratelimit_state.interval,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
},
{
.procname = "message_burst",
.data = &net_ratelimit_state.burst,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec,
},
#ifdef CONFIG_RPS
{
.procname = "rps_sock_flow_entries",
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = rps_sock_flow_sysctl
},
#endif
#ifdef CONFIG_NET_FLOW_LIMIT
{
.procname = "flow_limit_cpu_bitmap",
.mode = 0644,
.proc_handler = flow_limit_cpu_sysctl
},
{
.procname = "flow_limit_table_len",
.data = &netdev_flow_limit_table_len,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = flow_limit_table_len_sysctl
},
#endif /* CONFIG_NET_FLOW_LIMIT */
#ifdef CONFIG_NET_RX_BUSY_POLL
{
.procname = "busy_poll",
.data = &sysctl_net_busy_poll,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
},
{
.procname = "busy_read",
.data = &sysctl_net_busy_read,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.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
{
.procname = "netdev_budget",
.data = &net_hotdata.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 = &net_hotdata.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 = &net_hotdata.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_TWO,
},
{
.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 = SYSCTL_THREE,
},
{
.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 = &net_hotdata.gro_normal_batch,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ONE,
},
{
.procname = "netdev_unregister_timeout_secs",
.data = &netdev_unregister_timeout_secs,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ONE,
.extra2 = &int_3600,
},
{
.procname = "skb_defer_max",
.data = &net_hotdata.sysctl_skb_defer_max,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
},
};
static struct ctl_table netns_core_table[] = {
#if IS_ENABLED(CONFIG_RPS)
{
.procname = "rps_default_mask",
.data = &init_net,
.mode = 0644,
.proc_handler = rps_default_mask_sysctl
},
#endif
{
.procname = "somaxconn",
.data = &init_net.core.sysctl_somaxconn,
.maxlen = sizeof(int),
.mode = 0644,
.extra1 = SYSCTL_ZERO,
.proc_handler = proc_dointvec_minmax
},
{
.procname = "optmem_max",
.data = &init_net.core.sysctl_optmem_max,
.maxlen = sizeof(int),
.mode = 0644,
.extra1 = SYSCTL_ZERO,
.proc_handler = proc_dointvec_minmax
},
{
.procname = "txrehash",
.data = &init_net.core.sysctl_txrehash,
.maxlen = sizeof(u8),
.mode = 0644,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
.proc_handler = proc_dou8vec_minmax,
},
{
.procname = "tstamp_allow_data",
.data = &init_net.core.sysctl_tstamp_allow_data,
.maxlen = sizeof(u8),
.mode = 0644,
.proc_handler = proc_dou8vec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE
},
/* sysctl_core_net_init() will set the values after this
* to readonly in network namespaces
*/
{
.procname = "wmem_max",
.data = &sysctl_wmem_max,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_sndbuf,
},
{
.procname = "rmem_max",
.data = &sysctl_rmem_max,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_rcvbuf,
},
{
.procname = "wmem_default",
.data = &sysctl_wmem_default,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_sndbuf,
},
{
.procname = "rmem_default",
.data = &sysctl_rmem_default,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_rcvbuf,
},
};
static int __init fb_tunnels_only_for_init_net_sysctl_setup(char *str)
{
/* fallback tunnels for initns only */
if (!strncmp(str, "initns", 6))
sysctl_fb_tunnels_only_for_init_net = 1;
/* no fallback tunnels anywhere */
else if (!strncmp(str, "none", 4))
sysctl_fb_tunnels_only_for_init_net = 2;
return 1;
}
__setup("fb_tunnels=", fb_tunnels_only_for_init_net_sysctl_setup);
static __net_init int sysctl_core_net_init(struct net *net)
{
size_t table_size = ARRAY_SIZE(netns_core_table);
struct ctl_table *tbl;
tbl = netns_core_table;
if (!net_eq(net, &init_net)) {
int i;
tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL);
if (tbl == NULL)
goto err_dup;
for (i = 0; i < table_size; ++i) {
if (tbl[i].data == &sysctl_wmem_max)
break;
tbl[i].data += (char *)net - (char *)&init_net;
}
for (; i < table_size; ++i)
tbl[i].mode &= ~0222;
}
net->core.sysctl_hdr = register_net_sysctl_sz(net, "net/core", tbl, table_size);
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)
{
const 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);
#if IS_ENABLED(CONFIG_RPS)
kfree(net->core.rps_default_mask);
#endif
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);
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