58c4c6a3f7
systemd-sysctl is triggering a suspicious RCU usage message when
net.ipv4.tcp_early_demux or net.ipv4.udp_early_demux is changed via
a sysctl config file:
[ 33.896184] ===============================
[ 33.899558] [ ERR: suspicious RCU usage. ]
[ 33.900624] 4.11.0-rc7+ #104 Not tainted
[ 33.901698] -------------------------------
[ 33.903059] /home/dsa/kernel-2.git/net/ipv4/sysctl_net_ipv4.c:305 suspicious rcu_dereference_check() usage!
[ 33.905724]
other info that might help us debug this:
[ 33.907656]
rcu_scheduler_active = 2, debug_locks = 0
[ 33.909288] 1 lock held by systemd-sysctl/143:
[ 33.910373] #0: (sb_writers#5){.+.+.+}, at: [<ffffffff8123a370>] file_start_write+0x45/0x48
[ 33.912407]
stack backtrace:
[ 33.914018] CPU: 0 PID: 143 Comm: systemd-sysctl Not tainted 4.11.0-rc7+ #104
[ 33.915631] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[ 33.917870] Call Trace:
[ 33.918431] dump_stack+0x81/0xb6
[ 33.919241] lockdep_rcu_suspicious+0x10f/0x118
[ 33.920263] proc_configure_early_demux+0x65/0x10a
[ 33.921391] proc_udp_early_demux+0x3a/0x41
add rcu locking to proc_configure_early_demux.
Fixes: dddb64bcb3 ("net: Add sysctl to toggle early demux for tcp and udp")
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1169 lines
28 KiB
C
1169 lines
28 KiB
C
/*
|
|
* 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>
|
|
|
|
static int zero;
|
|
static int one = 1;
|
|
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 };
|
|
|
|
/* 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) ||
|
|
(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 proc_tcp_congestion_control(struct ctl_table *ctl, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
char val[TCP_CA_NAME_MAX];
|
|
struct ctl_table tbl = {
|
|
.data = val,
|
|
.maxlen = TCP_CA_NAME_MAX,
|
|
};
|
|
int ret;
|
|
|
|
tcp_get_default_congestion_control(val);
|
|
|
|
ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
|
|
if (write && ret == 0)
|
|
ret = tcp_set_default_congestion_control(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 *ctl, int write,
|
|
void __user *buffer, size_t *lenp,
|
|
loff_t *ppos)
|
|
{
|
|
struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
|
|
struct tcp_fastopen_context *ctxt;
|
|
int ret;
|
|
u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
|
|
|
|
tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
|
|
if (!tbl.data)
|
|
return -ENOMEM;
|
|
|
|
rcu_read_lock();
|
|
ctxt = rcu_dereference(tcp_fastopen_ctx);
|
|
if (ctxt)
|
|
memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
|
|
else
|
|
memset(user_key, 0, sizeof(user_key));
|
|
rcu_read_unlock();
|
|
|
|
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;
|
|
}
|
|
/* Generate a dummy secret but don't publish it. This
|
|
* is needed so we don't regenerate a new key on the
|
|
* first invocation of tcp_fastopen_cookie_gen
|
|
*/
|
|
tcp_fastopen_init_key_once(false);
|
|
tcp_fastopen_reset_cipher(user_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 struct ctl_table ipv4_table[] = {
|
|
{
|
|
.procname = "tcp_timestamps",
|
|
.data = &sysctl_tcp_timestamps,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_window_scaling",
|
|
.data = &sysctl_tcp_window_scaling,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_sack",
|
|
.data = &sysctl_tcp_sack,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_retrans_collapse",
|
|
.data = &sysctl_tcp_retrans_collapse,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_max_orphans",
|
|
.data = &sysctl_tcp_max_orphans,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_fastopen",
|
|
.data = &sysctl_tcp_fastopen,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "tcp_fastopen_key",
|
|
.mode = 0600,
|
|
.maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
|
|
.proc_handler = proc_tcp_fastopen_key,
|
|
},
|
|
{
|
|
.procname = "tcp_abort_on_overflow",
|
|
.data = &sysctl_tcp_abort_on_overflow,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_stdurg",
|
|
.data = &sysctl_tcp_stdurg,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_rfc1337",
|
|
.data = &sysctl_tcp_rfc1337,
|
|
.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_fack",
|
|
.data = &sysctl_tcp_fack,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_recovery",
|
|
.data = &sysctl_tcp_recovery,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "tcp_max_reordering",
|
|
.data = &sysctl_tcp_max_reordering,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_dsack",
|
|
.data = &sysctl_tcp_dsack,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_mem",
|
|
.maxlen = sizeof(sysctl_tcp_mem),
|
|
.data = &sysctl_tcp_mem,
|
|
.mode = 0644,
|
|
.proc_handler = proc_doulongvec_minmax,
|
|
},
|
|
{
|
|
.procname = "tcp_wmem",
|
|
.data = &sysctl_tcp_wmem,
|
|
.maxlen = sizeof(sysctl_tcp_wmem),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &one,
|
|
},
|
|
{
|
|
.procname = "tcp_rmem",
|
|
.data = &sysctl_tcp_rmem,
|
|
.maxlen = sizeof(sysctl_tcp_rmem),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &one,
|
|
},
|
|
{
|
|
.procname = "tcp_app_win",
|
|
.data = &sysctl_tcp_app_win,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_adv_win_scale",
|
|
.data = &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 = &sysctl_tcp_frto,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_min_rtt_wlen",
|
|
.data = &sysctl_tcp_min_rtt_wlen,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_low_latency",
|
|
.data = &sysctl_tcp_low_latency,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_no_metrics_save",
|
|
.data = &sysctl_tcp_nometrics_save,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "tcp_moderate_rcvbuf",
|
|
.data = &sysctl_tcp_moderate_rcvbuf,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "tcp_tso_win_divisor",
|
|
.data = &sysctl_tcp_tso_win_divisor,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "tcp_congestion_control",
|
|
.mode = 0644,
|
|
.maxlen = TCP_CA_NAME_MAX,
|
|
.proc_handler = proc_tcp_congestion_control,
|
|
},
|
|
{
|
|
.procname = "tcp_workaround_signed_windows",
|
|
.data = &sysctl_tcp_workaround_signed_windows,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_limit_output_bytes",
|
|
.data = &sysctl_tcp_limit_output_bytes,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_challenge_ack_limit",
|
|
.data = &sysctl_tcp_challenge_ack_limit,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_slow_start_after_idle",
|
|
.data = &sysctl_tcp_slow_start_after_idle,
|
|
.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_thin_linear_timeouts",
|
|
.data = &sysctl_tcp_thin_linear_timeouts,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec
|
|
},
|
|
{
|
|
.procname = "tcp_early_retrans",
|
|
.data = &sysctl_tcp_early_retrans,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &four,
|
|
},
|
|
{
|
|
.procname = "tcp_min_tso_segs",
|
|
.data = &sysctl_tcp_min_tso_segs,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &one,
|
|
.extra2 = &gso_max_segs,
|
|
},
|
|
{
|
|
.procname = "tcp_pacing_ss_ratio",
|
|
.data = &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 = &sysctl_tcp_pacing_ca_ratio,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &thousand,
|
|
},
|
|
{
|
|
.procname = "tcp_autocorking",
|
|
.data = &sysctl_tcp_autocorking,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &zero,
|
|
.extra2 = &one,
|
|
},
|
|
{
|
|
.procname = "tcp_invalid_ratelimit",
|
|
.data = &sysctl_tcp_invalid_ratelimit,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_ms_jiffies,
|
|
},
|
|
{
|
|
.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,
|
|
},
|
|
{
|
|
.procname = "udp_rmem_min",
|
|
.data = &sysctl_udp_rmem_min,
|
|
.maxlen = sizeof(sysctl_udp_rmem_min),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &one
|
|
},
|
|
{
|
|
.procname = "udp_wmem_min",
|
|
.data = &sysctl_udp_wmem_min,
|
|
.maxlen = sizeof(sysctl_udp_wmem_min),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = &one
|
|
},
|
|
{ }
|
|
};
|
|
|
|
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_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(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.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_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
|
|
},
|
|
{
|
|
.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
|
|
},
|
|
#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_dointvec_minmax,
|
|
.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
|
|
{ }
|
|
};
|
|
|
|
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);
|