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authorEric Dumazet <edumazet@google.com>2017-10-27 07:47:26 -0700
committerDavid S. Miller <davem@davemloft.net>2017-10-28 19:24:38 +0900
commitb530b68148301d73775cd27cc136ce4dd5738ae8 (patch)
tree17b24c9b241619498bcae2ff8049653ae4ea46ed /net/ipv4
parenttcp: Namespace-ify sysctl_tcp_limit_output_bytes (diff)
downloadlinux-dev-b530b68148301d73775cd27cc136ce4dd5738ae8.tar.xz
linux-dev-b530b68148301d73775cd27cc136ce4dd5738ae8.zip
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>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/sysctl_net_ipv4.c14
-rw-r--r--net/ipv4/tcp_input.c14
-rw-r--r--net/ipv4/tcp_ipv4.c2
3 files changed, 15 insertions, 15 deletions
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 6caf5c40730f..e28b3b7a7bbc 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -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
+ },
{ }
};
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index ce481325115f..928048a4e2c5 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -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);
}
}
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 713b80261e4f..50ab3a3eced3 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -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);