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Diffstat (limited to 'net')
-rw-r--r--net/ipv4/inet_connection_sock.c22
-rw-r--r--net/ipv4/inet_hashtables.c13
-rw-r--r--net/ipv4/sysctl_net_ipv4.c75
-rw-r--r--net/ipv4/tcp_ipv4.c1
-rw-r--r--net/ipv4/udp.c6
-rw-r--r--net/ipv6/inet6_hashtables.c12
-rw-r--r--net/sctp/socket.c11
7 files changed, 110 insertions, 30 deletions
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index fbe7714..3cef128 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -33,6 +33,19 @@ EXPORT_SYMBOL(inet_csk_timer_bug_msg);
* This array holds the first and last local port number.
*/
int sysctl_local_port_range[2] = { 32768, 61000 };
+DEFINE_SEQLOCK(sysctl_port_range_lock);
+
+void inet_get_local_port_range(int *low, int *high)
+{
+ unsigned seq;
+ do {
+ seq = read_seqbegin(&sysctl_port_range_lock);
+
+ *low = sysctl_local_port_range[0];
+ *high = sysctl_local_port_range[1];
+ } while (read_seqretry(&sysctl_port_range_lock, seq));
+}
+EXPORT_SYMBOL(inet_get_local_port_range);
int inet_csk_bind_conflict(const struct sock *sk,
const struct inet_bind_bucket *tb)
@@ -77,10 +90,11 @@ int inet_csk_get_port(struct inet_hashinfo *hashinfo,
local_bh_disable();
if (!snum) {
- int low = sysctl_local_port_range[0];
- int high = sysctl_local_port_range[1];
- int remaining = (high - low) + 1;
- int rover = net_random() % (high - low) + low;
+ int remaining, rover, low, high;
+
+ inet_get_local_port_range(&low, &high);
+ remaining = high - low;
+ rover = net_random() % remaining + low;
do {
head = &hashinfo->bhash[inet_bhashfn(rover, hashinfo->bhash_size)];
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index fb66262..fac6398 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -279,19 +279,18 @@ int inet_hash_connect(struct inet_timewait_death_row *death_row,
int ret;
if (!snum) {
- int low = sysctl_local_port_range[0];
- int high = sysctl_local_port_range[1];
- int range = high - low;
- int i;
- int port;
+ int i, remaining, low, high, port;
static u32 hint;
u32 offset = hint + inet_sk_port_offset(sk);
struct hlist_node *node;
struct inet_timewait_sock *tw = NULL;
+ inet_get_local_port_range(&low, &high);
+ remaining = high - low;
+
local_bh_disable();
- for (i = 1; i <= range; i++) {
- port = low + (i + offset) % range;
+ for (i = 1; i <= remaining; i++) {
+ port = low + (i + offset) % remaining;
head = &hinfo->bhash[inet_bhashfn(port, hinfo->bhash_size)];
spin_lock(&head->lock);
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 53ef0f4..eb286ab 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -12,6 +12,7 @@
#include <linux/sysctl.h>
#include <linux/igmp.h>
#include <linux/inetdevice.h>
+#include <linux/seqlock.h>
#include <net/snmp.h>
#include <net/icmp.h>
#include <net/ip.h>
@@ -89,6 +90,74 @@ static int ipv4_sysctl_forward_strategy(ctl_table *table,
return 1;
}
+extern seqlock_t sysctl_port_range_lock;
+extern int sysctl_local_port_range[2];
+
+/* Update system visible IP port range */
+static void set_local_port_range(int range[2])
+{
+ write_seqlock(&sysctl_port_range_lock);
+ sysctl_local_port_range[0] = range[0];
+ sysctl_local_port_range[1] = range[1];
+ write_sequnlock(&sysctl_port_range_lock);
+}
+
+/* Validate changes from /proc interface. */
+static int ipv4_local_port_range(ctl_table *table, int write, struct file *filp,
+ void __user *buffer,
+ size_t *lenp, loff_t *ppos)
+{
+ int ret;
+ int range[2] = { sysctl_local_port_range[0],
+ sysctl_local_port_range[1] };
+ ctl_table tmp = {
+ .data = &range,
+ .maxlen = sizeof(range),
+ .mode = table->mode,
+ .extra1 = &ip_local_port_range_min,
+ .extra2 = &ip_local_port_range_max,
+ };
+
+ ret = proc_dointvec_minmax(&tmp, write, filp, buffer, lenp, ppos);
+
+ if (write && ret == 0) {
+ if (range[1] <= range[0])
+ ret = -EINVAL;
+ else
+ set_local_port_range(range);
+ }
+
+ return ret;
+}
+
+/* Validate changes from sysctl interface. */
+static int ipv4_sysctl_local_port_range(ctl_table *table, int __user *name,
+ int nlen, void __user *oldval,
+ size_t __user *oldlenp,
+ void __user *newval, size_t newlen)
+{
+ int ret;
+ int range[2] = { sysctl_local_port_range[0],
+ sysctl_local_port_range[1] };
+ ctl_table tmp = {
+ .data = &range,
+ .maxlen = sizeof(range),
+ .mode = table->mode,
+ .extra1 = &ip_local_port_range_min,
+ .extra2 = &ip_local_port_range_max,
+ };
+
+ ret = sysctl_intvec(&tmp, name, nlen, oldval, oldlenp, newval, newlen);
+ if (ret == 0 && newval && newlen) {
+ if (range[1] <= range[0])
+ ret = -EINVAL;
+ else
+ set_local_port_range(range);
+ }
+ return ret;
+}
+
+
static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
@@ -427,10 +496,8 @@ ctl_table ipv4_table[] = {
.data = &sysctl_local_port_range,
.maxlen = sizeof(sysctl_local_port_range),
.mode = 0644,
- .proc_handler = &proc_dointvec_minmax,
- .strategy = &sysctl_intvec,
- .extra1 = ip_local_port_range_min,
- .extra2 = ip_local_port_range_max
+ .proc_handler = &ipv4_local_port_range,
+ .strategy = &ipv4_sysctl_local_port_range,
},
{
.ctl_name = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 8855e64..38cf73a 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2470,6 +2470,5 @@ EXPORT_SYMBOL(tcp_v4_syn_recv_sock);
EXPORT_SYMBOL(tcp_proc_register);
EXPORT_SYMBOL(tcp_proc_unregister);
#endif
-EXPORT_SYMBOL(sysctl_local_port_range);
EXPORT_SYMBOL(sysctl_tcp_low_latency);
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index ef4d901..cb9fc58 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -147,11 +147,11 @@ int __udp_lib_get_port(struct sock *sk, unsigned short snum,
write_lock_bh(&udp_hash_lock);
if (!snum) {
- int i;
- int low = sysctl_local_port_range[0];
- int high = sysctl_local_port_range[1];
+ int i, low, high;
unsigned rover, best, best_size_so_far;
+ inet_get_local_port_range(&low, &high);
+
best_size_so_far = UINT_MAX;
best = rover = net_random() % (high - low) + low;
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index ae6b0e7..1c2c276 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -254,18 +254,18 @@ int inet6_hash_connect(struct inet_timewait_death_row *death_row,
int ret;
if (snum == 0) {
- const int low = sysctl_local_port_range[0];
- const int high = sysctl_local_port_range[1];
- const int range = high - low;
- int i, port;
+ int i, port, low, high, remaining;
static u32 hint;
const u32 offset = hint + inet6_sk_port_offset(sk);
struct hlist_node *node;
struct inet_timewait_sock *tw = NULL;
+ inet_get_local_port_range(&low, &high);
+ remaining = high - low;
+
local_bh_disable();
- for (i = 1; i <= range; i++) {
- port = low + (i + offset) % range;
+ for (i = 1; i <= remaining; i++) {
+ port = low + (i + offset) % remaining;
head = &hinfo->bhash[inet_bhashfn(port, hinfo->bhash_size)];
spin_lock(&head->lock);
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 7cd58ef..9c6a4b5 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5315,11 +5315,12 @@ static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
if (snum == 0) {
/* Search for an available port. */
- unsigned int low = sysctl_local_port_range[0];
- unsigned int high = sysctl_local_port_range[1];
- unsigned int remaining = (high - low) + 1;
- unsigned int rover = net_random() % remaining + low;
- int index;
+ int low, high, remaining, index;
+ unsigned int rover;
+
+ inet_get_local_port_range(&low, &high);
+ remaining = (high - low) + 1;
+ rover = net_random() % remaining + low;
do {
rover++;
generated by cgit v0.10.2 at 2024-07-15 10:07:32 (GMT)