lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20240205124752.811108-14-edumazet@google.com>
Date: Mon,  5 Feb 2024 12:47:50 +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: Antoine Tenart <atenart@...nel.org>, netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v3 net-next 13/15] ip_tunnel: use exit_batch_rtnl() method

exit_batch_rtnl() is called while RTNL is held,
and devices to be unregistered can be queued in the dev_kill_list.

This saves one rtnl_lock()/rtnl_unlock() pair
and one unregister_netdevice_many() call.

This patch takes care of ipip, ip_vti, and ip_gre tunnels.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/net/ip_tunnels.h |  3 ++-
 net/ipv4/ip_gre.c        | 24 +++++++++++++++---------
 net/ipv4/ip_tunnel.c     | 10 ++++------
 net/ipv4/ip_vti.c        |  8 +++++---
 net/ipv4/ipip.c          |  8 +++++---
 5 files changed, 31 insertions(+), 22 deletions(-)

diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index 2d746f4c9a0a4792bc16971c107d598190897433..5cd64bb2104df389250fb3c518ba00a3826c53f7 100644
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -284,7 +284,8 @@ int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id,
 		       struct rtnl_link_ops *ops, char *devname);
 
 void ip_tunnel_delete_nets(struct list_head *list_net, unsigned int id,
-			   struct rtnl_link_ops *ops);
+			   struct rtnl_link_ops *ops,
+			   struct list_head *dev_to_kill);
 
 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
 		    const struct iphdr *tnl_params, const u8 protocol);
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 5169c3c72cffe49cef613e69889d139db867ff74..aad5125b7a65ecc770f1b962ac5b417bd931e3ba 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -1025,14 +1025,16 @@ static int __net_init ipgre_init_net(struct net *net)
 	return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL);
 }
 
-static void __net_exit ipgre_exit_batch_net(struct list_head *list_net)
+static void __net_exit ipgre_exit_batch_rtnl(struct list_head *list_net,
+					     struct list_head *dev_to_kill)
 {
-	ip_tunnel_delete_nets(list_net, ipgre_net_id, &ipgre_link_ops);
+	ip_tunnel_delete_nets(list_net, ipgre_net_id, &ipgre_link_ops,
+			      dev_to_kill);
 }
 
 static struct pernet_operations ipgre_net_ops = {
 	.init = ipgre_init_net,
-	.exit_batch = ipgre_exit_batch_net,
+	.exit_batch_rtnl = ipgre_exit_batch_rtnl,
 	.id   = &ipgre_net_id,
 	.size = sizeof(struct ip_tunnel_net),
 };
@@ -1697,14 +1699,16 @@ static int __net_init ipgre_tap_init_net(struct net *net)
 	return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, "gretap0");
 }
 
-static void __net_exit ipgre_tap_exit_batch_net(struct list_head *list_net)
+static void __net_exit ipgre_tap_exit_batch_rtnl(struct list_head *list_net,
+						 struct list_head *dev_to_kill)
 {
-	ip_tunnel_delete_nets(list_net, gre_tap_net_id, &ipgre_tap_ops);
+	ip_tunnel_delete_nets(list_net, gre_tap_net_id, &ipgre_tap_ops,
+			      dev_to_kill);
 }
 
 static struct pernet_operations ipgre_tap_net_ops = {
 	.init = ipgre_tap_init_net,
-	.exit_batch = ipgre_tap_exit_batch_net,
+	.exit_batch_rtnl = ipgre_tap_exit_batch_rtnl,
 	.id   = &gre_tap_net_id,
 	.size = sizeof(struct ip_tunnel_net),
 };
@@ -1715,14 +1719,16 @@ static int __net_init erspan_init_net(struct net *net)
 				  &erspan_link_ops, "erspan0");
 }
 
-static void __net_exit erspan_exit_batch_net(struct list_head *net_list)
+static void __net_exit erspan_exit_batch_rtnl(struct list_head *net_list,
+					      struct list_head *dev_to_kill)
 {
-	ip_tunnel_delete_nets(net_list, erspan_net_id, &erspan_link_ops);
+	ip_tunnel_delete_nets(net_list, erspan_net_id, &erspan_link_ops,
+			      dev_to_kill);
 }
 
 static struct pernet_operations erspan_net_ops = {
 	.init = erspan_init_net,
-	.exit_batch = erspan_exit_batch_net,
+	.exit_batch_rtnl = erspan_exit_batch_rtnl,
 	.id   = &erspan_net_id,
 	.size = sizeof(struct ip_tunnel_net),
 };
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index beeae624c412d752bd5ee5d459a88f57640445e9..00da0b80320fb514bca58de7cd13894ab49a2ca6 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -1130,19 +1130,17 @@ static void ip_tunnel_destroy(struct net *net, struct ip_tunnel_net *itn,
 }
 
 void ip_tunnel_delete_nets(struct list_head *net_list, unsigned int id,
-			   struct rtnl_link_ops *ops)
+			   struct rtnl_link_ops *ops,
+			   struct list_head *dev_to_kill)
 {
 	struct ip_tunnel_net *itn;
 	struct net *net;
-	LIST_HEAD(list);
 
-	rtnl_lock();
+	ASSERT_RTNL();
 	list_for_each_entry(net, net_list, exit_list) {
 		itn = net_generic(net, id);
-		ip_tunnel_destroy(net, itn, &list, ops);
+		ip_tunnel_destroy(net, itn, dev_to_kill, ops);
 	}
-	unregister_netdevice_many(&list);
-	rtnl_unlock();
 }
 EXPORT_SYMBOL_GPL(ip_tunnel_delete_nets);
 
diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c
index 9ab9b3ebe0cd1a9e95f489d98c5a3d89c7c0edf6..fb1f52d2131128a39ab5bf0482359b7b75989fb6 100644
--- a/net/ipv4/ip_vti.c
+++ b/net/ipv4/ip_vti.c
@@ -510,14 +510,16 @@ static int __net_init vti_init_net(struct net *net)
 	return 0;
 }
 
-static void __net_exit vti_exit_batch_net(struct list_head *list_net)
+static void __net_exit vti_exit_batch_rtnl(struct list_head *list_net,
+					   struct list_head *dev_to_kill)
 {
-	ip_tunnel_delete_nets(list_net, vti_net_id, &vti_link_ops);
+	ip_tunnel_delete_nets(list_net, vti_net_id, &vti_link_ops,
+			      dev_to_kill);
 }
 
 static struct pernet_operations vti_net_ops = {
 	.init = vti_init_net,
-	.exit_batch = vti_exit_batch_net,
+	.exit_batch_rtnl = vti_exit_batch_rtnl,
 	.id   = &vti_net_id,
 	.size = sizeof(struct ip_tunnel_net),
 };
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 27b8f83c6ea200314f41a29ecfea494b9ddef2ca..0151eea06cc50bec4ae64f08ca6a7161e3cbf9ae 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -592,14 +592,16 @@ static int __net_init ipip_init_net(struct net *net)
 	return ip_tunnel_init_net(net, ipip_net_id, &ipip_link_ops, "tunl0");
 }
 
-static void __net_exit ipip_exit_batch_net(struct list_head *list_net)
+static void __net_exit ipip_exit_batch_rtnl(struct list_head *list_net,
+					    struct list_head *dev_to_kill)
 {
-	ip_tunnel_delete_nets(list_net, ipip_net_id, &ipip_link_ops);
+	ip_tunnel_delete_nets(list_net, ipip_net_id, &ipip_link_ops,
+			      dev_to_kill);
 }
 
 static struct pernet_operations ipip_net_ops = {
 	.init = ipip_init_net,
-	.exit_batch = ipip_exit_batch_net,
+	.exit_batch_rtnl = ipip_exit_batch_rtnl,
 	.id   = &ipip_net_id,
 	.size = sizeof(struct ip_tunnel_net),
 };
-- 
2.43.0.594.gd9cf4e227d-goog


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ