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Subject[PATCH 1/9] ipv4: Namespaceify tcp syn retries sysctl knob
Date
Signed-off-by: Nikolay Borisov <kernel@kyup.com>
---
include/net/netns/ipv4.h | 2 ++
include/net/tcp.h | 1 -
net/ipv4/sysctl_net_ipv4.c | 18 +++++++++---------
net/ipv4/tcp.c | 3 ++-
net/ipv4/tcp_ipv4.c | 2 ++
net/ipv4/tcp_timer.c | 4 ++--
6 files changed, 17 insertions(+), 13 deletions(-)

diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index ffa2777b6475..59c6155e4896 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -95,6 +95,8 @@ struct netns_ipv4 {
int sysctl_tcp_keepalive_probes;
int sysctl_tcp_keepalive_intvl;

+ int sysctl_tcp_syn_retries;
+
struct ping_group_range ping_group_range;

atomic_t dev_addr_genid;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 3ed10fc89c7d..a7f6f25297d7 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -240,7 +240,6 @@ extern int sysctl_tcp_timestamps;
extern int sysctl_tcp_window_scaling;
extern int sysctl_tcp_sack;
extern int sysctl_tcp_fin_timeout;
-extern int sysctl_tcp_syn_retries;
extern int sysctl_tcp_synack_retries;
extern int sysctl_tcp_retries1;
extern int sysctl_tcp_retries2;
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index fccf8e92bf81..db95287d2b94 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -293,15 +293,6 @@ static struct ctl_table ipv4_table[] = {
.extra2 = &ip_ttl_max,
},
{
- .procname = "tcp_syn_retries",
- .data = &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 = &sysctl_tcp_synack_retries,
.maxlen = sizeof(int),
@@ -950,6 +941,15 @@ static struct ctl_table ipv4_net_table[] = {
.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
+ },
{ }
};

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index c82cca18c90f..bb36a39b5685 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2722,6 +2722,7 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
{
struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);
+ struct net *net = sock_net(sk);
int val, len;

if (get_user(len, optlen))
@@ -2756,7 +2757,7 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
val = keepalive_probes(tp);
break;
case TCP_SYNCNT:
- val = icsk->icsk_syn_retries ? : sysctl_tcp_syn_retries;
+ val = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_syn_retries;
break;
case TCP_LINGER2:
val = tp->linger2;
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 9db9bdb14449..c9944e0c48d3 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2382,6 +2382,8 @@ static int __net_init tcp_sk_init(struct net *net)
net->ipv4.sysctl_tcp_keepalive_probes = TCP_KEEPALIVE_PROBES;
net->ipv4.sysctl_tcp_keepalive_intvl = TCP_KEEPALIVE_INTVL;

+ net->ipv4.sysctl_tcp_syn_retries = TCP_SYN_RETRIES;
+
return 0;
fail:
tcp_sk_exit(net);
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index a4730a28b220..c5d51f530c65 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -22,7 +22,6 @@
#include <linux/gfp.h>
#include <net/tcp.h>

-int sysctl_tcp_syn_retries __read_mostly = TCP_SYN_RETRIES;
int sysctl_tcp_synack_retries __read_mostly = TCP_SYNACK_RETRIES;
int sysctl_tcp_retries1 __read_mostly = TCP_RETR1;
int sysctl_tcp_retries2 __read_mostly = TCP_RETR2;
@@ -157,6 +156,7 @@ static int tcp_write_timeout(struct sock *sk)
{
struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);
+ struct net *net = sock_net(sk);
int retry_until;
bool do_reset, syn_set = false;

@@ -169,7 +169,7 @@ static int tcp_write_timeout(struct sock *sk)
NET_INC_STATS_BH(sock_net(sk),
LINUX_MIB_TCPFASTOPENACTIVEFAIL);
}
- retry_until = icsk->icsk_syn_retries ? : sysctl_tcp_syn_retries;
+ retry_until = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_syn_retries;
syn_set = true;
} else {
if (retransmits_timed_out(sk, sysctl_tcp_retries1, 0, 0)) {
--
2.5.0
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