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From: Xin Long <lucien.xin@gmail.com>
To: network dev <netdev@vger.kernel.org>, linux-sctp@vger.kernel.org
Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>,
	Neil Horman <nhorman@tuxdriver.com>,
	Michael Tuexen <tuexen@fh-muenster.de>,
	davem@davemloft.net, gnault@redhat.com, pabeni@redhat.com,
	willemdebruijn.kernel@gmail.com
Subject: [PATCHv4 net-next 16/16] sctp: enable udp tunneling socks
Date: Mon, 19 Oct 2020 12:25:33 +0000	[thread overview]
Message-ID: <b65bdc11e5a17e328227676ea283cee617f973fb.1603110316.git.lucien.xin@gmail.com> (raw)
In-Reply-To: <81779bb5f9dbe452d91904f617d8083f1ba91a34.1603110316.git.lucien.xin@gmail.com>

This patch is to enable udp tunneling socks by calling
sctp_udp_sock_start() in sctp_ctrlsock_init(), and
sctp_udp_sock_stop() in sctp_ctrlsock_exit().

Also add sysctl udp_port to allow changing the listening
sock's port by users.

Wit this patch, the whole sctp over udp feature can be
enabled and used.

v1->v2:
  - Also update ctl_sock udp_port in proc_sctp_do_udp_port()
    where netns udp_port gets changed.
v2->v3:
  - Call htons() when setting sk udp_port from netns udp_port.
v3->v4:
  - Not call sctp_udp_sock_start() when new_value is 0.
  - Add udp_port entry in ip-sysctl.rst.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 Documentation/networking/ip-sysctl.rst |  6 ++++
 net/sctp/protocol.c                    |  5 ++++
 net/sctp/sysctl.c                      | 52 ++++++++++++++++++++++++++++++++++
 3 files changed, 63 insertions(+)

diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index 3909305..9effc45 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -2640,6 +2640,12 @@ addr_scope_policy - INTEGER
 
 	Default: 1
 
+udp_port - INTEGER
+	The listening port for the local UDP tunneling sock.
+	UDP encapsulation will be disabled when it's set to 0.
+
+	Default: 9899
+
 encap_port - INTEGER
 	The default remote UDP encapsalution port.
 	When UDP tunneling is enabled, this global value is used to set
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index c8de327..894ab12 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -1469,6 +1469,10 @@ static int __net_init sctp_ctrlsock_init(struct net *net)
 	if (status)
 		pr_err("Failed to initialize the SCTP control sock\n");
 
+	status = sctp_udp_sock_start(net);
+	if (status)
+		pr_err("Failed to initialize the SCTP UDP tunneling sock\n");
+
 	return status;
 }
 
@@ -1476,6 +1480,7 @@ static void __net_exit sctp_ctrlsock_exit(struct net *net)
 {
 	/* Free the control endpoint.  */
 	inet_ctl_sock_destroy(net->sctp.ctl_sock);
+	sctp_udp_sock_stop(net);
 }
 
 static struct pernet_operations sctp_ctrlsock_ops = {
diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index ecc1b5e..e92df77 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -49,6 +49,8 @@ static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
 				void *buffer, size_t *lenp, loff_t *ppos);
 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write, void *buffer,
 				size_t *lenp, loff_t *ppos);
+static int proc_sctp_do_udp_port(struct ctl_table *ctl, int write, void *buffer,
+				 size_t *lenp, loff_t *ppos);
 static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
 				   void *buffer, size_t *lenp, loff_t *ppos);
 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
@@ -292,6 +294,15 @@ static struct ctl_table sctp_net_table[] = {
 		.proc_handler	= proc_dointvec,
 	},
 	{
+		.procname	= "udp_port",
+		.data		= &init_net.sctp.udp_port,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_sctp_do_udp_port,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= &udp_port_max,
+	},
+	{
 		.procname	= "encap_port",
 		.data		= &init_net.sctp.encap_port,
 		.maxlen		= sizeof(int),
@@ -487,6 +498,47 @@ static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
 	return ret;
 }
 
+static int proc_sctp_do_udp_port(struct ctl_table *ctl, int write,
+				 void *buffer, size_t *lenp, loff_t *ppos)
+{
+	struct net *net = current->nsproxy->net_ns;
+	unsigned int min = *(unsigned int *)ctl->extra1;
+	unsigned int max = *(unsigned int *)ctl->extra2;
+	struct ctl_table tbl;
+	int ret, new_value;
+
+	memset(&tbl, 0, sizeof(struct ctl_table));
+	tbl.maxlen = sizeof(unsigned int);
+
+	if (write)
+		tbl.data = &new_value;
+	else
+		tbl.data = &net->sctp.udp_port;
+
+	ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
+	if (write && ret = 0) {
+		struct sock *sk = net->sctp.ctl_sock;
+
+		if (new_value > max || new_value < min)
+			return -EINVAL;
+
+		net->sctp.udp_port = new_value;
+		sctp_udp_sock_stop(net);
+		if (new_value) {
+			ret = sctp_udp_sock_start(net);
+			if (ret)
+				net->sctp.udp_port = 0;
+		}
+
+		/* Update the value in the control socket */
+		lock_sock(sk);
+		sctp_sk(sk)->udp_port = htons(net->sctp.udp_port);
+		release_sock(sk);
+	}
+
+	return ret;
+}
+
 int sctp_sysctl_net_register(struct net *net)
 {
 	struct ctl_table *table;
-- 
2.1.0

WARNING: multiple messages have this Message-ID
From: Xin Long <lucien.xin@gmail.com>
To: network dev <netdev@vger.kernel.org>, linux-sctp@vger.kernel.org
Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>,
	Neil Horman <nhorman@tuxdriver.com>,
	Michael Tuexen <tuexen@fh-muenster.de>,
	davem@davemloft.net, gnault@redhat.com, pabeni@redhat.com,
	willemdebruijn.kernel@gmail.com
Subject: [PATCHv4 net-next 16/16] sctp: enable udp tunneling socks
Date: Mon, 19 Oct 2020 20:25:33 +0800	[thread overview]
Message-ID: <b65bdc11e5a17e328227676ea283cee617f973fb.1603110316.git.lucien.xin@gmail.com> (raw)
Message-ID: <20201019122533.gLp5dyBE-04do8ZDGVNINlzkkAem8-piMBpbkEan1hk@z> (raw)
In-Reply-To: <81779bb5f9dbe452d91904f617d8083f1ba91a34.1603110316.git.lucien.xin@gmail.com>
In-Reply-To: <cover.1603110316.git.lucien.xin@gmail.com>

This patch is to enable udp tunneling socks by calling
sctp_udp_sock_start() in sctp_ctrlsock_init(), and
sctp_udp_sock_stop() in sctp_ctrlsock_exit().

Also add sysctl udp_port to allow changing the listening
sock's port by users.

Wit this patch, the whole sctp over udp feature can be
enabled and used.

v1->v2:
  - Also update ctl_sock udp_port in proc_sctp_do_udp_port()
    where netns udp_port gets changed.
v2->v3:
  - Call htons() when setting sk udp_port from netns udp_port.
v3->v4:
  - Not call sctp_udp_sock_start() when new_value is 0.
  - Add udp_port entry in ip-sysctl.rst.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
 Documentation/networking/ip-sysctl.rst |  6 ++++
 net/sctp/protocol.c                    |  5 ++++
 net/sctp/sysctl.c                      | 52 ++++++++++++++++++++++++++++++++++
 3 files changed, 63 insertions(+)

diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index 3909305..9effc45 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst
@@ -2640,6 +2640,12 @@ addr_scope_policy - INTEGER
 
 	Default: 1
 
+udp_port - INTEGER
+	The listening port for the local UDP tunneling sock.
+	UDP encapsulation will be disabled when it's set to 0.
+
+	Default: 9899
+
 encap_port - INTEGER
 	The default remote UDP encapsalution port.
 	When UDP tunneling is enabled, this global value is used to set
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index c8de327..894ab12 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -1469,6 +1469,10 @@ static int __net_init sctp_ctrlsock_init(struct net *net)
 	if (status)
 		pr_err("Failed to initialize the SCTP control sock\n");
 
+	status = sctp_udp_sock_start(net);
+	if (status)
+		pr_err("Failed to initialize the SCTP UDP tunneling sock\n");
+
 	return status;
 }
 
@@ -1476,6 +1480,7 @@ static void __net_exit sctp_ctrlsock_exit(struct net *net)
 {
 	/* Free the control endpoint.  */
 	inet_ctl_sock_destroy(net->sctp.ctl_sock);
+	sctp_udp_sock_stop(net);
 }
 
 static struct pernet_operations sctp_ctrlsock_ops = {
diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index ecc1b5e..e92df77 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -49,6 +49,8 @@ static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
 				void *buffer, size_t *lenp, loff_t *ppos);
 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write, void *buffer,
 				size_t *lenp, loff_t *ppos);
+static int proc_sctp_do_udp_port(struct ctl_table *ctl, int write, void *buffer,
+				 size_t *lenp, loff_t *ppos);
 static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
 				   void *buffer, size_t *lenp, loff_t *ppos);
 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
@@ -292,6 +294,15 @@ static struct ctl_table sctp_net_table[] = {
 		.proc_handler	= proc_dointvec,
 	},
 	{
+		.procname	= "udp_port",
+		.data		= &init_net.sctp.udp_port,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_sctp_do_udp_port,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= &udp_port_max,
+	},
+	{
 		.procname	= "encap_port",
 		.data		= &init_net.sctp.encap_port,
 		.maxlen		= sizeof(int),
@@ -487,6 +498,47 @@ static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
 	return ret;
 }
 
+static int proc_sctp_do_udp_port(struct ctl_table *ctl, int write,
+				 void *buffer, size_t *lenp, loff_t *ppos)
+{
+	struct net *net = current->nsproxy->net_ns;
+	unsigned int min = *(unsigned int *)ctl->extra1;
+	unsigned int max = *(unsigned int *)ctl->extra2;
+	struct ctl_table tbl;
+	int ret, new_value;
+
+	memset(&tbl, 0, sizeof(struct ctl_table));
+	tbl.maxlen = sizeof(unsigned int);
+
+	if (write)
+		tbl.data = &new_value;
+	else
+		tbl.data = &net->sctp.udp_port;
+
+	ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
+	if (write && ret == 0) {
+		struct sock *sk = net->sctp.ctl_sock;
+
+		if (new_value > max || new_value < min)
+			return -EINVAL;
+
+		net->sctp.udp_port = new_value;
+		sctp_udp_sock_stop(net);
+		if (new_value) {
+			ret = sctp_udp_sock_start(net);
+			if (ret)
+				net->sctp.udp_port = 0;
+		}
+
+		/* Update the value in the control socket */
+		lock_sock(sk);
+		sctp_sk(sk)->udp_port = htons(net->sctp.udp_port);
+		release_sock(sk);
+	}
+
+	return ret;
+}
+
 int sctp_sysctl_net_register(struct net *net)
 {
 	struct ctl_table *table;
-- 
2.1.0


  parent reply	other threads:[~2020-10-19 12:25 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-19 12:25 [PATCHv4 net-next 00/16] sctp: Implement RFC6951: UDP Encapsulation of SCTP Xin Long
2020-10-19 12:25 ` Xin Long
2020-10-19 12:25 ` [PATCHv4 net-next 01/16] udp: check udp sock encap_type in __udp_lib_err Xin Long
2020-10-19 12:25   ` Xin Long
2020-10-19 12:25   ` [PATCHv4 net-next 02/16] udp6: move the mss check after udp gso tunnel processing Xin Long
2020-10-19 12:25     ` Xin Long
2020-10-19 12:25     ` [PATCHv4 net-next 03/16] udp: support sctp over udp in skb_udp_tunnel_segment Xin Long
2020-10-19 12:25       ` Xin Long
2020-10-19 12:25       ` [PATCHv4 net-next 04/16] sctp: create udp4 sock and add its encap_rcv Xin Long
2020-10-19 12:25         ` Xin Long
2020-10-19 12:25         ` [PATCHv4 net-next 05/16] sctp: create udp6 sock and set " Xin Long
2020-10-19 12:25           ` Xin Long
2020-10-19 12:25           ` [PATCHv4 net-next 06/16] sctp: add encap_err_lookup for udp encap socks Xin Long
2020-10-19 12:25             ` Xin Long
2020-10-19 12:25             ` [PATCHv4 net-next 07/16] sctp: add encap_port for netns sock asoc and transport Xin Long
2020-10-19 12:25               ` Xin Long
2020-10-19 12:25               ` [PATCHv4 net-next 08/16] sctp: add SCTP_REMOTE_UDP_ENCAPS_PORT sockopt Xin Long
2020-10-19 12:25                 ` Xin Long
2020-10-19 12:25                 ` [PATCHv4 net-next 09/16] sctp: allow changing transport encap_port by peer packets Xin Long
2020-10-19 12:25                   ` Xin Long
2020-10-19 12:25                   ` [PATCHv4 net-next 10/16] sctp: add udphdr to overhead when udp_port is set Xin Long
2020-10-19 12:25                     ` Xin Long
2020-10-19 12:25                     ` [PATCHv4 net-next 11/16] sctp: call sk_setup_caps in sctp_packet_transmit instead Xin Long
2020-10-19 12:25                       ` Xin Long
2020-10-19 12:25                       ` [PATCHv4 net-next 12/16] sctp: support for sending packet over udp4 sock Xin Long
2020-10-19 12:25                         ` Xin Long
2020-10-19 12:25                         ` [PATCHv4 net-next 13/16] sctp: support for sending packet over udp6 sock Xin Long
2020-10-19 12:25                           ` Xin Long
2020-10-19 12:25                           ` [PATCHv4 net-next 14/16] sctp: add the error cause for new encapsulation port restart Xin Long
2020-10-19 12:25                             ` Xin Long
2020-10-19 12:25                             ` [PATCHv4 net-next 15/16] sctp: handle the init chunk matching an existing asoc Xin Long
2020-10-19 12:25                               ` Xin Long
2020-10-19 12:25                               ` Xin Long [this message]
2020-10-19 12:25                                 ` [PATCHv4 net-next 16/16] sctp: enable udp tunneling socks Xin Long
2020-10-19 22:15                                 ` Marcelo Ricardo Leitner
2020-10-19 22:15                                   ` Marcelo Ricardo Leitner
2020-10-19 22:29                                   ` Marcelo Ricardo Leitner
2020-10-19 22:29                                     ` Marcelo Ricardo Leitner
2020-10-20  9:12                                   ` Xin Long
2020-10-20  9:12                                     ` Xin Long
2020-10-20 21:11                                     ` Marcelo Ricardo Leitner
2020-10-20 21:11                                       ` Marcelo Ricardo Leitner
2020-10-20 21:15                                       ` Michael Tuexen
2020-10-20 21:15                                         ` Michael Tuexen
2020-10-20 21:23                                         ` Marcelo Ricardo Leitner
2020-10-20 21:23                                           ` Marcelo Ricardo Leitner
2020-10-20 22:08                                           ` David Laight
2020-10-20 22:13                                             ` 'Marcelo Ricardo Leitner'
2020-10-20 22:13                                               ` 'Marcelo Ricardo Leitner'
2020-10-21  4:16                                           ` Xin Long
2020-10-21  9:13                                             ` Michael Tuexen
2020-10-22  3:12                                               ` Xin Long
2020-10-22  8:47                                                 ` David Laight
2020-10-26  5:58                                                   ` Xin Long
2020-10-22 11:38                                                 ` Michael Tuexen
2020-10-19 22:14               ` [PATCHv4 net-next 07/16] sctp: add encap_port for netns sock asoc and transport Marcelo Ricardo Leitner
2020-10-19 22:14                 ` Marcelo Ricardo Leitner

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