@@ -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/*``
========================
@@ -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
@@ -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.
*/
@@ -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;
@@ -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;
@@ -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;
@@ -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),
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(+)