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tcp: Namespace-ify sysctl_tcp_challenge_ack_limit 

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2017-10-27 07:47:26 -07:00 committed by David S. Miller
parent 9184d8bb44
commit b530b68148
5 changed files with 16 additions and 16 deletions
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1
include/net/netns/ipv4.h
View File

@ -147,6 +147,7 @@ struct netns_ipv4 {
int sysctl_tcp_tso_win_divisor;
int sysctl_tcp_workaround_signed_windows;
int sysctl_tcp_limit_output_bytes;
int sysctl_tcp_challenge_ack_limit;
struct inet_timewait_death_row tcp_death_row;
int sysctl_max_syn_backlog;
int sysctl_tcp_fastopen;

1
include/net/tcp.h
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@ -250,7 +250,6 @@ extern int sysctl_tcp_rmem[3];
#define TCP_RACK_LOSS_DETECTION 0x1 /* Use RACK to detect losses */
extern int sysctl_tcp_challenge_ack_limit;
extern int sysctl_tcp_min_tso_segs;
extern int sysctl_tcp_min_rtt_wlen;
extern int sysctl_tcp_autocorking;

14
net/ipv4/sysctl_net_ipv4.c
View File

@ -457,13 +457,6 @@ static struct ctl_table ipv4_table[] = {
.maxlen = TCP_CA_NAME_MAX,
.proc_handler = proc_tcp_congestion_control,
},
{
.procname = "tcp_challenge_ack_limit",
.data = &sysctl_tcp_challenge_ack_limit,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
#ifdef CONFIG_NETLABEL
{
.procname = "cipso_cache_enable",
@ -1145,6 +1138,13 @@ static struct ctl_table ipv4_net_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec
},
{
.procname = "tcp_challenge_ack_limit",
.data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{ }
};

14
net/ipv4/tcp_input.c
View File

@ -79,9 +79,6 @@
#include <linux/unaligned/access_ok.h>
#include <linux/static_key.h>
/* rfc5961 challenge ack rate limiting */
int sysctl_tcp_challenge_ack_limit = 1000;
int sysctl_tcp_max_orphans __read_mostly = NR_FILE;
int sysctl_tcp_min_rtt_wlen __read_mostly = 300;
int sysctl_tcp_invalid_ratelimit __read_mostly = HZ/2;
@ -3443,10 +3440,11 @@ static void tcp_send_challenge_ack(struct sock *sk, const struct sk_buff *skb)
static u32 challenge_timestamp;
static unsigned int challenge_count;
struct tcp_sock *tp = tcp_sk(sk);
struct net *net = sock_net(sk);
u32 count, now;
/* First check our per-socket dupack rate limit. */
if (__tcp_oow_rate_limited(sock_net(sk),
if (__tcp_oow_rate_limited(net,
LINUX_MIB_TCPACKSKIPPEDCHALLENGE,
&tp->last_oow_ack_time))
return;
@ -3454,16 +3452,16 @@ static void tcp_send_challenge_ack(struct sock *sk, const struct sk_buff *skb)
/* Then check host-wide RFC 5961 rate limit. */
now = jiffies / HZ;
if (now != challenge_timestamp) {
u32 half = (sysctl_tcp_challenge_ack_limit + 1) >> 1;
u32 ack_limit = net->ipv4.sysctl_tcp_challenge_ack_limit;
u32 half = (ack_limit + 1) >> 1;
challenge_timestamp = now;
WRITE_ONCE(challenge_count, half +
prandom_u32_max(sysctl_tcp_challenge_ack_limit));
WRITE_ONCE(challenge_count, half + prandom_u32_max(ack_limit));
}
count = READ_ONCE(challenge_count);
if (count > 0) {
WRITE_ONCE(challenge_count, count - 1);
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPCHALLENGEACK);
NET_INC_STATS(net, LINUX_MIB_TCPCHALLENGEACK);
tcp_send_ack(sk);
}
}

2
net/ipv4/tcp_ipv4.c
View File

@ -2501,6 +2501,8 @@ static int __net_init tcp_sk_init(struct net *net)
net->ipv4.sysctl_tcp_tso_win_divisor = 3;
/* Default TSQ limit of four TSO segments */
net->ipv4.sysctl_tcp_limit_output_bytes = 262144;
/* rfc5961 challenge ack rate limiting */
net->ipv4.sysctl_tcp_challenge_ack_limit = 1000;
net->ipv4.sysctl_tcp_fastopen = TFO_CLIENT_ENABLE;
spin_lock_init(&net->ipv4.tcp_fastopen_ctx_lock);