[PATCHv4 net-next 07/16] sctp: add encap_port for netns sock asoc and transport
From: Xin Long <lucien.xin@gmail.com>
Date: 2020-10-19 12:26:38
Also in:
linux-sctp
Subsystem:
documentation, networking [general], sctp protocol, the rest · Maintainers:
Jonathan Corbet, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Marcelo Ricardo Leitner, Xin Long, Linus Torvalds
encap_port is added as per netns/sock/assoc/transport, and the
latter one's encap_port inherits the former one's by default.
The transport's encap_port value would mostly decide if one
packet should go out with udp encapsulated or not.
This patch also allows users to set netns' encap_port by sysctl.
v1->v2:
- Change to define encap_port as __be16 for sctp_sock, asoc and
transport.
v2->v3:
- No change.
v3->v4:
- Add 'encap_port' entry in ip-sysctl.rst.
Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
Documentation/networking/ip-sysctl.rst | 9 +++++++++
include/net/netns/sctp.h | 2 ++
include/net/sctp/structs.h | 6 ++++++
net/sctp/associola.c | 4 ++++
net/sctp/protocol.c | 3 +++
net/sctp/socket.c | 1 +
net/sctp/sysctl.c | 10 ++++++++++
7 files changed, 35 insertions(+)
diff --git a/Documentation/networking/ip-sysctl.rst b/Documentation/networking/ip-sysctl.rst
index 837d51f..3909305 100644
--- a/Documentation/networking/ip-sysctl.rst
+++ b/Documentation/networking/ip-sysctl.rst@@ -2640,6 +2640,15 @@ addr_scope_policy - INTEGER Default: 1 +encap_port - INTEGER + The default remote UDP encapsalution port. + When UDP tunneling is enabled, this global value is used to set + the dest port for the udp header of outgoing packets by default. + Users can also change the value for each sock/asoc/transport by + using setsockopt. + + Default: 0 + ``/proc/sys/net/core/*`` ========================
diff --git a/include/net/netns/sctp.h b/include/net/netns/sctp.h
index 247b401..a0f315e 100644
--- a/include/net/netns/sctp.h
+++ b/include/net/netns/sctp.h@@ -27,6 +27,8 @@ struct netns_sctp { struct sock *udp6_sock; /* UDP tunneling listening port. */ int udp_port; + /* UDP tunneling remote encap port. */ + int encap_port; /* This is the global local address list. * We actively maintain this complete list of addresses on
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 0bdff38..aa98e7e 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h@@ -178,6 +178,8 @@ struct sctp_sock { */ __u32 hbinterval; + __be16 encap_port; + /* This is the max_retrans value for new associations. */ __u16 pathmaxrxt;
@@ -877,6 +879,8 @@ struct sctp_transport { */ unsigned long last_time_ecne_reduced; + __be16 encap_port; + /* This is the max_retrans value for the transport and will * be initialized from the assocs value. This can be changed * using the SCTP_SET_PEER_ADDR_PARAMS socket option.
@@ -1790,6 +1794,8 @@ struct sctp_association { */ unsigned long hbinterval; + __be16 encap_port; + /* This is the max_retrans value for new transports in the * association. */
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index fdb69d4..336df4b 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c@@ -99,6 +99,8 @@ static struct sctp_association *sctp_association_init( */ asoc->hbinterval = msecs_to_jiffies(sp->hbinterval); + asoc->encap_port = sp->encap_port; + /* Initialize path max retrans value. */ asoc->pathmaxrxt = sp->pathmaxrxt;
@@ -624,6 +626,8 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc, */ peer->hbinterval = asoc->hbinterval; + peer->encap_port = asoc->encap_port; + /* Set the path max_retrans. */ peer->pathmaxrxt = asoc->pathmaxrxt;
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index aa8e5b2..7c729d7 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c@@ -1359,6 +1359,9 @@ static int __net_init sctp_defaults_init(struct net *net) /* Set UDP tunneling listening port to default value */ net->sctp.udp_port = SCTP_DEFAULT_UDP_PORT; + /* Set remote encap port to 0 by default */ + net->sctp.encap_port = 0; + /* Set SCOPE policy to enabled */ net->sctp.scope_policy = SCTP_SCOPE_POLICY_ENABLE;
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 53d0a41..09b94cd 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c@@ -4876,6 +4876,7 @@ static int sctp_init_sock(struct sock *sk) * be modified via SCTP_PEER_ADDR_PARAMS */ sp->hbinterval = net->sctp.hb_interval; + sp->encap_port = htons(net->sctp.encap_port); sp->pathmaxrxt = net->sctp.max_retrans_path; sp->pf_retrans = net->sctp.pf_retrans; sp->ps_retrans = net->sctp.ps_retrans;
diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index c16c809..ecc1b5e 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c@@ -36,6 +36,7 @@ static int rto_alpha_max = 1000; static int rto_beta_max = 1000; static int pf_expose_max = SCTP_PF_EXPOSE_MAX; static int ps_retrans_max = SCTP_PS_RETRANS_MAX; +static int udp_port_max = 65535; static unsigned long max_autoclose_min = 0; static unsigned long max_autoclose_max =
@@ -291,6 +292,15 @@ static struct ctl_table sctp_net_table[] = { .proc_handler = proc_dointvec, }, { + .procname = "encap_port", + .data = &init_net.sctp.encap_port, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + .extra1 = SYSCTL_ZERO, + .extra2 = &udp_port_max, + }, + { .procname = "addr_scope_policy", .data = &init_net.sctp.scope_policy, .maxlen = sizeof(int),
--
2.1.0