Merge branch 'tcp-more-perns-sysctls'

Eric Dumazet says:

====================
tcp: move 12 sysctls to namespaces

Ideally all TCP sysctls should be per netns.
This patch series takes care of 12 sysctls.

Remains the ones that need discussion :

sysctl_tcp_mem, sysctl_tcp_rmem, sysctl_tcp_wmem, and sysctl_tcp_max_orphans
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

11 files changed, 149 insertions, 164 deletions

diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index f4622e28db3a..141ba82b5efb 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -142,6 +142,18 @@ struct netns_ipv4 {
 	int sysctl_tcp_app_win;
 	int sysctl_tcp_adv_win_scale;
 	int sysctl_tcp_frto;
+	int sysctl_tcp_nometrics_save;
+	int sysctl_tcp_moderate_rcvbuf;
+	int sysctl_tcp_tso_win_divisor;
+	int sysctl_tcp_workaround_signed_windows;
+	int sysctl_tcp_limit_output_bytes;
+	int sysctl_tcp_challenge_ack_limit;
+	int sysctl_tcp_min_tso_segs;
+	int sysctl_tcp_min_rtt_wlen;
+	int sysctl_tcp_autocorking;
+	int sysctl_tcp_invalid_ratelimit;
+	int sysctl_tcp_pacing_ss_ratio;
+	int sysctl_tcp_pacing_ca_ratio;
 	struct inet_timewait_death_row tcp_death_row;
 	int sysctl_max_syn_backlog;
 	int sysctl_tcp_fastopen;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 18f047501f53..092d606fcc16 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -247,22 +247,9 @@ extern int sysctl_tcp_max_orphans;
 extern long sysctl_tcp_mem[3];
 extern int sysctl_tcp_wmem[3];
 extern int sysctl_tcp_rmem[3];
-extern int sysctl_tcp_nometrics_save;
-extern int sysctl_tcp_moderate_rcvbuf;
-extern int sysctl_tcp_tso_win_divisor;
-extern int sysctl_tcp_workaround_signed_windows;
 
 #define TCP_RACK_LOSS_DETECTION  0x1 /* Use RACK to detect losses */
 
-extern int sysctl_tcp_limit_output_bytes;
-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;
-extern int sysctl_tcp_invalid_ratelimit;
-extern int sysctl_tcp_pacing_ss_ratio;
-extern int sysctl_tcp_pacing_ca_ratio;
-
 extern atomic_long_t tcp_memory_allocated;
 extern struct percpu_counter tcp_sockets_allocated;
 extern unsigned long tcp_memory_pressure;
@@ -1305,7 +1292,8 @@ static inline void tcp_slow_start_after_idle_check(struct sock *sk)
 }
 
 /* Determine a window scaling and initial window to offer. */
-void tcp_select_initial_window(int __space, __u32 mss, __u32 *rcv_wnd,
+void tcp_select_initial_window(const struct sock *sk, int __space,
+			       __u32 mss, __u32 *rcv_wnd,
 			       __u32 *window_clamp, int wscale_ok,
 			       __u8 *rcv_wscale, __u32 init_rcv_wnd);
 
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 77cf32a80952..fda37f2862c9 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -385,7 +385,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
 	/* Try to redo what tcp_v4_send_synack did. */
 	req->rsk_window_clamp = tp->window_clamp ? :dst_metric(&rt->dst, RTAX_WINDOW);
 
-	tcp_select_initial_window(tcp_full_space(sk), req->mss,
+	tcp_select_initial_window(sk, tcp_full_space(sk), req->mss,
 				  &req->rsk_rcv_wnd, &req->rsk_window_clamp,
 				  ireq->wscale_ok, &rcv_wscale,
 				  dst_metric(&rt->dst, RTAX_INITRWND));
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index f1bcb9b7e082..4602af6d5358 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -438,13 +438,6 @@ static struct ctl_table ipv4_table[] = {
 		.extra1		= &one,
 	},
 	{
-		.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),
@@ -452,53 +445,11 @@ static struct ctl_table ipv4_table[] = {
 		.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
-	},
 #ifdef CONFIG_NETLABEL
 	{
 		.procname	= "cipso_cache_enable",
@@ -542,49 +493,6 @@ static struct ctl_table ipv4_table[] = {
 		.proc_handler   = proc_allowed_congestion_control,
 	},
 	{
-		.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	= "tcp_available_ulp",
 		.maxlen		= TCP_ULP_BUF_MAX,
 		.mode		= 0444,
@@ -1145,6 +1053,98 @@ static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec
 	},
+	{
+		.procname	= "tcp_no_metrics_save",
+		.data		= &init_net.ipv4.sysctl_tcp_nometrics_save,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+	{
+		.procname	= "tcp_moderate_rcvbuf",
+		.data		= &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+	{
+		.procname	= "tcp_tso_win_divisor",
+		.data		= &init_net.ipv4.sysctl_tcp_tso_win_divisor,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+	{
+		.procname	= "tcp_workaround_signed_windows",
+		.data		= &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec
+	},
+	{
+		.procname	= "tcp_limit_output_bytes",
+		.data		= &init_net.ipv4.sysctl_tcp_limit_output_bytes,
+		.maxlen		= sizeof(int),
+		.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
+	},
+	{
+		.procname	= "tcp_min_tso_segs",
+		.data		= &init_net.ipv4.sysctl_tcp_min_tso_segs,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &one,
+		.extra2		= &gso_max_segs,
+	},
+	{
+		.procname	= "tcp_min_rtt_wlen",
+		.data		= &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec
+	},
+	{
+		.procname	= "tcp_autocorking",
+		.data		= &init_net.ipv4.sysctl_tcp_autocorking,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &zero,
+		.extra2		= &one,
+	},
+	{
+		.procname	= "tcp_invalid_ratelimit",
+		.data		= &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_ms_jiffies,
+	},
+	{
+		.procname	= "tcp_pacing_ss_ratio",
+		.data		= &init_net.ipv4.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		= &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &zero,
+		.extra2		= &thousand,
+	},
 	{ }
 };
 
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index c7c983f0f817..a7a0f316eb86 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -285,10 +285,6 @@
 
 #include <trace/events/tcp.h>
 
-int sysctl_tcp_min_tso_segs __read_mostly = 2;
-
-int sysctl_tcp_autocorking __read_mostly = 1;
-
 struct percpu_counter tcp_orphan_count;
 EXPORT_SYMBOL_GPL(tcp_orphan_count);
 
@@ -699,7 +695,7 @@ static bool tcp_should_autocork(struct sock *sk, struct sk_buff *skb,
 				int size_goal)
 {
 	return skb->len < size_goal &&
-	       sysctl_tcp_autocorking &&
+	       sock_net(sk)->ipv4.sysctl_tcp_autocorking &&
 	       skb != tcp_write_queue_head(sk) &&
 	       refcount_read(&sk->sk_wmem_alloc) > skb->truesize;
 }
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 90d76f1c8f96..21c358c0cf2e 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -79,13 +79,7 @@
 #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_moderate_rcvbuf __read_mostly = 1;
-int sysctl_tcp_invalid_ratelimit __read_mostly = HZ/2;
 
 #define FLAG_DATA		0x01 /* Incoming frame contained data.		*/
 #define FLAG_WIN_UPDATE		0x02 /* Incoming ACK was a window update.	*/
@@ -411,7 +405,7 @@ static void tcp_fixup_rcvbuf(struct sock *sk)
 	/* Dynamic Right Sizing (DRS) has 2 to 3 RTT latency
 	 * Allow enough cushion so that sender is not limited by our window
 	 */
-	if (sysctl_tcp_moderate_rcvbuf)
+	if (sock_net(sk)->ipv4.sysctl_tcp_moderate_rcvbuf)
 		rcvmem <<= 2;
 
 	if (sk->sk_rcvbuf < rcvmem)
@@ -602,7 +596,7 @@ void tcp_rcv_space_adjust(struct sock *sk)
 	 * <prev RTT . ><current RTT .. ><next RTT .... >
 	 */
 
-	if (sysctl_tcp_moderate_rcvbuf &&
+	if (sock_net(sk)->ipv4.sysctl_tcp_moderate_rcvbuf &&
 	    !(sk->sk_userlocks & SOCK_RCVBUF_LOCK)) {
 		int rcvwin, rcvmem, rcvbuf;
 
@@ -773,15 +767,6 @@ static void tcp_rtt_estimator(struct sock *sk, long mrtt_us)
 	tp->srtt_us = max(1U, srtt);
 }
 
-/* Set the sk_pacing_rate to allow proper sizing of TSO packets.
- * Note: TCP stack does not yet implement pacing.
- * FQ packet scheduler can be used to implement cheap but effective
- * TCP pacing, to smooth the burst on large writes when packets
- * in flight is significantly lower than cwnd (or rwin)
- */
-int sysctl_tcp_pacing_ss_ratio __read_mostly = 200;
-int sysctl_tcp_pacing_ca_ratio __read_mostly = 120;
-
 static void tcp_update_pacing_rate(struct sock *sk)
 {
 	const struct tcp_sock *tp = tcp_sk(sk);
@@ -799,9 +784,9 @@ static void tcp_update_pacing_rate(struct sock *sk)
 	 *	 end of slow start and should slow down.
 	 */
 	if (tp->snd_cwnd < tp->snd_ssthresh / 2)
-		rate *= sysctl_tcp_pacing_ss_ratio;
+		rate *= sock_net(sk)->ipv4.sysctl_tcp_pacing_ss_ratio;
 	else
-		rate *= sysctl_tcp_pacing_ca_ratio;
+		rate *= sock_net(sk)->ipv4.sysctl_tcp_pacing_ca_ratio;
 
 	rate *= max(tp->snd_cwnd, tp->packets_out);
 
@@ -2919,8 +2904,8 @@ static void tcp_fastretrans_alert(struct sock *sk, const int acked,
 
 static void tcp_update_rtt_min(struct sock *sk, u32 rtt_us)
 {
+	u32 wlen = sock_net(sk)->ipv4.sysctl_tcp_min_rtt_wlen * HZ;
 	struct tcp_sock *tp = tcp_sk(sk);
-	u32 wlen = sysctl_tcp_min_rtt_wlen * HZ;
 
 	minmax_running_min(&tp->rtt_min, wlen, tcp_jiffies32,
 			   rtt_us ? : jiffies_to_usecs(1));
@@ -3408,7 +3393,7 @@ static bool __tcp_oow_rate_limited(struct net *net, int mib_idx,
 	if (*last_oow_ack_time) {
 		s32 elapsed = (s32)(tcp_jiffies32 - *last_oow_ack_time);
 
-		if (0 <= elapsed && elapsed < sysctl_tcp_invalid_ratelimit) {
+		if (0 <= elapsed && elapsed < net->ipv4.sysctl_tcp_invalid_ratelimit) {
 			NET_INC_STATS(net, mib_idx);
 			return true;	/* rate-limited: don't send yet! */
 		}
@@ -3444,10 +3429,11 @@ 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;
@@ -3455,16 +3441,16 @@ 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 49757c758211..7c1dae6493c3 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2493,6 +2493,22 @@ static int __net_init tcp_sk_init(struct net *net)
 	net->ipv4.sysctl_tcp_app_win = 31;
 	net->ipv4.sysctl_tcp_adv_win_scale = 1;
 	net->ipv4.sysctl_tcp_frto = 2;
+	net->ipv4.sysctl_tcp_moderate_rcvbuf = 1;
+	/* This limits the percentage of the congestion window which we
+	 * will allow a single TSO frame to consume.  Building TSO frames
+	 * which are too large can cause TCP streams to be bursty.
+	 */
+	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_min_tso_segs = 2;
+	net->ipv4.sysctl_tcp_min_rtt_wlen = 300;
+	net->ipv4.sysctl_tcp_autocorking = 1;
+	net->ipv4.sysctl_tcp_invalid_ratelimit = HZ/2;
+	net->ipv4.sysctl_tcp_pacing_ss_ratio = 200;
+	net->ipv4.sysctl_tcp_pacing_ca_ratio = 120;
 
 	net->ipv4.sysctl_tcp_fastopen = TFO_CLIENT_ENABLE;
 	spin_lock_init(&net->ipv4.tcp_fastopen_ctx_lock);
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index 0ab78abc811b..0507b56b6d4b 100644
--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -20,8 +20,6 @@
 #include <net/tcp.h>
 #include <net/genetlink.h>
 
-int sysctl_tcp_nometrics_save __read_mostly;
-
 static struct tcp_metrics_block *__tcp_get_metrics(const struct inetpeer_addr *saddr,
 						   const struct inetpeer_addr *daddr,
 						   struct net *net, unsigned int hash);
@@ -330,7 +328,7 @@ void tcp_update_metrics(struct sock *sk)
 	int m;
 
 	sk_dst_confirm(sk);
-	if (sysctl_tcp_nometrics_save || !dst)
+	if (net->ipv4.sysctl_tcp_nometrics_save || !dst)
 		return;
 
 	rcu_read_lock();
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 3270ab8416ce..3c65c1a3f944 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -369,7 +369,7 @@ void tcp_openreq_init_rwin(struct request_sock *req,
 		full_space = rcv_wnd * mss;
 
 	/* tcp_full_space because it is guaranteed to be the first packet */
-	tcp_select_initial_window(full_space,
+	tcp_select_initial_window(sk_listener, full_space,
 		mss - (ireq->tstamp_ok ? TCPOLEN_TSTAMP_ALIGNED : 0),
 		&req->rsk_rcv_wnd,
 		&req->rsk_window_clamp,
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 55a0aa4b96df..aab6e7145013 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -45,20 +45,6 @@
 
 #include <trace/events/tcp.h>
 
-/* People can turn this on to work with those rare, broken TCPs that
- * interpret the window field as a signed quantity.
- */
-int sysctl_tcp_workaround_signed_windows __read_mostly = 0;
-
-/* Default TSQ limit of four TSO segments */
-int sysctl_tcp_limit_output_bytes __read_mostly = 262144;
-
-/* This limits the percentage of the congestion window which we
- * will allow a single TSO frame to consume.  Building TSO frames
- * which are too large can cause TCP streams to be bursty.
- */
-int sysctl_tcp_tso_win_divisor __read_mostly = 3;
-
 static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
 			   int push_one, gfp_t gfp);
 
@@ -202,7 +188,7 @@ u32 tcp_default_init_rwnd(u32 mss)
  * be a multiple of mss if possible. We assume here that mss >= 1.
  * This MUST be enforced by all callers.
  */
-void tcp_select_initial_window(int __space, __u32 mss,
+void tcp_select_initial_window(const struct sock *sk, int __space, __u32 mss,
 			       __u32 *rcv_wnd, __u32 *window_clamp,
 			       int wscale_ok, __u8 *rcv_wscale,
 			       __u32 init_rcv_wnd)
@@ -226,7 +212,7 @@ void tcp_select_initial_window(int __space, __u32 mss,
 	 * which we interpret as a sign the remote TCP is not
 	 * misinterpreting the window field as a signed quantity.
 	 */
-	if (sysctl_tcp_workaround_signed_windows)
+	if (sock_net(sk)->ipv4.sysctl_tcp_workaround_signed_windows)
 		(*rcv_wnd) = min(space, MAX_TCP_WINDOW);
 	else
 		(*rcv_wnd) = space;
@@ -286,7 +272,8 @@ static u16 tcp_select_window(struct sock *sk)
 	/* Make sure we do not exceed the maximum possible
 	 * scaled window.
 	 */
-	if (!tp->rx_opt.rcv_wscale && sysctl_tcp_workaround_signed_windows)
+	if (!tp->rx_opt.rcv_wscale &&
+	    sock_net(sk)->ipv4.sysctl_tcp_workaround_signed_windows)
 		new_win = min(new_win, MAX_TCP_WINDOW);
 	else
 		new_win = min(new_win, (65535U << tp->rx_opt.rcv_wscale));
@@ -1771,7 +1758,8 @@ static u32 tcp_tso_segs(struct sock *sk, unsigned int mss_now)
 	u32 tso_segs = ca_ops->tso_segs_goal ? ca_ops->tso_segs_goal(sk) : 0;
 
 	return tso_segs ? :
-		tcp_tso_autosize(sk, mss_now, sysctl_tcp_min_tso_segs);
+		tcp_tso_autosize(sk, mss_now,
+				 sock_net(sk)->ipv4.sysctl_tcp_min_tso_segs);
 }
 
 /* Returns the portion of skb which can be sent right away */
@@ -1988,7 +1976,7 @@ static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb,
 	if ((skb != tcp_write_queue_tail(sk)) && (limit >= skb->len))
 		goto send_now;
 
-	win_divisor = ACCESS_ONCE(sysctl_tcp_tso_win_divisor);
+	win_divisor = ACCESS_ONCE(sock_net(sk)->ipv4.sysctl_tcp_tso_win_divisor);
 	if (win_divisor) {
 		u32 chunk = min(tp->snd_wnd, tp->snd_cwnd * tp->mss_cache);
 
@@ -2225,7 +2213,8 @@ static bool tcp_small_queue_check(struct sock *sk, const struct sk_buff *skb,
 	unsigned int limit;
 
 	limit = max(2 * skb->truesize, sk->sk_pacing_rate >> 10);
-	limit = min_t(u32, limit, sysctl_tcp_limit_output_bytes);
+	limit = min_t(u32, limit,
+		      sock_net(sk)->ipv4.sysctl_tcp_limit_output_bytes);
 	limit <<= factor;
 
 	if (refcount_read(&sk->sk_wmem_alloc) > limit) {
@@ -3355,7 +3344,7 @@ static void tcp_connect_init(struct sock *sk)
 	if (rcv_wnd == 0)
 		rcv_wnd = dst_metric(dst, RTAX_INITRWND);
 
-	tcp_select_initial_window(tcp_full_space(sk),
+	tcp_select_initial_window(sk, tcp_full_space(sk),
 				  tp->advmss - (tp->rx_opt.ts_recent_stamp ? tp->tcp_header_len - sizeof(struct tcphdr) : 0),
 				  &tp->rcv_wnd,
 				  &tp->window_clamp,
diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c
index 4e7817abc0b9..e7a3a6b6cf56 100644
--- a/net/ipv6/syncookies.c
+++ b/net/ipv6/syncookies.c
@@ -244,7 +244,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
 	}
 
 	req->rsk_window_clamp = tp->window_clamp ? :dst_metric(dst, RTAX_WINDOW);
-	tcp_select_initial_window(tcp_full_space(sk), req->mss,
+	tcp_select_initial_window(sk, tcp_full_space(sk), req->mss,
 				  &req->rsk_rcv_wnd, &req->rsk_window_clamp,
 				  ireq->wscale_ok, &rcv_wscale,
 				  dst_metric(dst, RTAX_INITRWND));