netdev - [PATCH net-next 3/3] icmp: icmp_msgs_per_sec and icmp_msgs

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Message-ID: <20240828193948.2692476-4-edumazet@google.com>
Date: Wed, 28 Aug 2024 19:39:48 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: David Ahern <dsahern@...nel.org>, Willy Tarreau <w@....eu>, Keyu Man <keyu.man@...il.ucr.edu>, 
	Jesper Dangaard Brouer <hawk@...nel.org>, netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 3/3] icmp: icmp_msgs_per_sec and icmp_msgs_burst
 sysctls become per netns

Previous patch made ICMP rate limits per netns, it makes sense
to allow each netns to change the associated sysctl.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/net/ip.h           |  3 ---
 include/net/netns/ipv4.h   |  2 ++
 net/ipv4/icmp.c            |  9 ++++-----
 net/ipv4/sysctl_net_ipv4.c | 32 ++++++++++++++++----------------
 4 files changed, 22 insertions(+), 24 deletions(-)

diff --git a/include/net/ip.h b/include/net/ip.h
index d3bca4e83979f681c4931e9ff62db5941a059c11..1ee472fa8b373e85907146f9a3f29ecc98e2e55b 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -797,9 +797,6 @@ static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
 bool icmp_global_allow(struct net *net);
 void icmp_global_consume(struct net *net);
 
-extern int sysctl_icmp_msgs_per_sec;
-extern int sysctl_icmp_msgs_burst;
-
 #ifdef CONFIG_PROC_FS
 int ip_misc_proc_init(void);
 #endif
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 54fe7c079fffb285b7a8a069f3d57f9440a6655a..276f622f3516871c438be27bafe61c039445b335 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -122,6 +122,8 @@ struct netns_ipv4 {
 	u8 sysctl_icmp_errors_use_inbound_ifaddr;
 	int sysctl_icmp_ratelimit;
 	int sysctl_icmp_ratemask;
+	int sysctl_icmp_msgs_per_sec;
+	int sysctl_icmp_msgs_burst;
 	atomic_t icmp_global_credit;
 	u32 icmp_global_stamp;
 	u32 ip_rt_min_pmtu;
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 8ad3139a00fb8c5cb8f28f92d125ef83d9e840c3..1f5d6f01ee9ef7a1b32a6619837176de16bd4389 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -220,9 +220,6 @@ static inline void icmp_xmit_unlock(struct sock *sk)
 	spin_unlock(&sk->sk_lock.slock);
 }
 
-int sysctl_icmp_msgs_per_sec __read_mostly = 1000;
-int sysctl_icmp_msgs_burst __read_mostly = 50;
-
 /**
  * icmp_global_allow - Are we allowed to send one more ICMP message ?
  *
@@ -248,14 +245,14 @@ bool icmp_global_allow(struct net *net)
 	if (delta < HZ / 50)
 		return false;
 
-	incr = READ_ONCE(sysctl_icmp_msgs_per_sec) * delta / HZ;
+	incr = READ_ONCE(net->ipv4.sysctl_icmp_msgs_per_sec) * delta / HZ;
 	if (!incr)
 		return false;
 
 	if (cmpxchg(&net->ipv4.icmp_global_stamp, oldstamp, now) == oldstamp) {
 		old = atomic_read(&net->ipv4.icmp_global_credit);
 		do {
-			new = min(old + incr, READ_ONCE(sysctl_icmp_msgs_burst));
+			new = min(old + incr, READ_ONCE(net->ipv4.sysctl_icmp_msgs_burst));
 		} while (!atomic_try_cmpxchg(&net->ipv4.icmp_global_credit, &old, new));
 	}
 	return true;
@@ -1491,6 +1488,8 @@ static int __net_init icmp_sk_init(struct net *net)
 	net->ipv4.sysctl_icmp_ratelimit = 1 * HZ;
 	net->ipv4.sysctl_icmp_ratemask = 0x1818;
 	net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr = 0;
+	net->ipv4.sysctl_icmp_msgs_per_sec = 1000;
+	net->ipv4.sysctl_icmp_msgs_burst = 50;
 
 	return 0;
 }
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 4af0c234d8d763f430608d60f38eff8a6d9935b4..a79b2a52ce01e6c1a1257ba31c17ac2f51ba19ec 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -600,22 +600,6 @@ static struct ctl_table ipv4_table[] = {
 		.mode		= 0444,
 		.proc_handler   = proc_tcp_available_ulp,
 	},
-	{
-		.procname	= "icmp_msgs_per_sec",
-		.data		= &sysctl_icmp_msgs_per_sec,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= SYSCTL_ZERO,
-	},
-	{
-		.procname	= "icmp_msgs_burst",
-		.data		= &sysctl_icmp_msgs_burst,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec_minmax,
-		.extra1		= SYSCTL_ZERO,
-	},
 	{
 		.procname	= "udp_mem",
 		.data		= &sysctl_udp_mem,
@@ -701,6 +685,22 @@ static struct ctl_table ipv4_net_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec
 	},
+	{
+		.procname	= "icmp_msgs_per_sec",
+		.data		= &init_net.ipv4.sysctl_icmp_msgs_per_sec,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+	},
+	{
+		.procname	= "icmp_msgs_burst",
+		.data		= &init_net.ipv4.sysctl_icmp_msgs_burst,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+	},
 	{
 		.procname	= "ping_group_range",
 		.data		= &init_net.ipv4.ping_group_range.range,
-- 
2.46.0.295.g3b9ea8a38a-goog