This patch is to implement:
rfc6951#section-6.1: Get or Set the Remote UDP Encapsulation Port Number
with the param of the struct:
struct sctp_udpencaps {
sctp_assoc_t sue_assoc_id;
struct sockaddr_storage sue_address;
uint16_t sue_port;
};
the encap_port of sock, assoc or transport can be changed by users,
which also means it allows the different transports of the same asoc
to have different encap_port value.
v1->v2:
- no change.
v2->v3:
- fix the endian warning when setting values between encap_port and
sue_port.
Signed-off-by: Xin Long <lucien....@gmail.com>
---
include/uapi/linux/sctp.h | 7 +++
net/sctp/socket.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 121 insertions(+)
diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h
index 28ad40d..cb78e7a 100644
--- a/include/uapi/linux/sctp.h
+++ b/include/uapi/linux/sctp.h
@@ -140,6 +140,7 @@ typedef __s32 sctp_assoc_t;
#define SCTP_ECN_SUPPORTED 130
#define SCTP_EXPOSE_POTENTIALLY_FAILED_STATE 131
#define SCTP_EXPOSE_PF_STATE SCTP_EXPOSE_POTENTIALLY_FAILED_STATE
+#define SCTP_REMOTE_UDP_ENCAPS_PORT 132
/* PR-SCTP policies */
#define SCTP_PR_SCTP_NONE 0x0000
@@ -1197,6 +1198,12 @@ struct sctp_event {
uint8_t se_on;
};
+struct sctp_udpencaps {
+ sctp_assoc_t sue_assoc_id;
+ struct sockaddr_storage sue_address;
+ uint16_t sue_port;
+};
+
/* SCTP Stream schedulers */
enum sctp_sched_type {
SCTP_SS_FCFS,
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 09b94cd..2a9ee9b 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4417,6 +4417,55 @@ static int sctp_setsockopt_pf_expose(struct sock *sk,
return retval;
}
+static int sctp_setsockopt_encap_port(struct sock *sk,
+ struct sctp_udpencaps *encap,
+ unsigned int optlen)
+{
+ struct sctp_association *asoc;
+ struct sctp_transport *t;
+ __be16 encap_port;
+
+ if (optlen != sizeof(*encap))
+ return -EINVAL;
+
+ /* If an address other than INADDR_ANY is specified, and
+ * no transport is found, then the request is invalid.
+ */
+ encap_port = (__force __be16)encap->sue_port;
+ if (!sctp_is_any(sk, (union sctp_addr *)&encap->sue_address)) {
+ t = sctp_addr_id2transport(sk, &encap->sue_address,
+ encap->sue_assoc_id);
+ if (!t)
+ return -EINVAL;
+
+ t->encap_port = encap_port;
+ return 0;
+ }
+
+ /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
+ * socket is a one to many style socket, and an association
+ * was not found, then the id was invalid.
+ */
+ asoc = sctp_id2assoc(sk, encap->sue_assoc_id);
+ if (!asoc && encap->sue_assoc_id != SCTP_FUTURE_ASSOC &&
+ sctp_style(sk, UDP))
+ return -EINVAL;
+
+ /* If changes are for association, also apply encap_port to
+ * each transport.
+ */
+ if (asoc) {
+ list_for_each_entry(t, &asoc->peer.transport_addr_list,
+ transports)
+ t->encap_port = encap_port;
+
+ return 0;
+ }
+
+ sctp_sk(sk)->encap_port = encap_port;
+ return 0;
+}
+
/* API 6.2 setsockopt(), getsockopt()
*
* Applications use setsockopt() and getsockopt() to set or retrieve
@@ -4636,6 +4685,9 @@ static int sctp_setsockopt(struct sock *sk, int level,
int optname,
case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
retval = sctp_setsockopt_pf_expose(sk, kopt, optlen);
break;
+ case SCTP_REMOTE_UDP_ENCAPS_PORT:
+ retval = sctp_setsockopt_encap_port(sk, kopt, optlen);
+ break;
default:
retval = -ENOPROTOOPT;
break;
@@ -7791,6 +7843,65 @@ static int sctp_getsockopt_pf_expose(struct sock *sk,
int len,
return retval;
}
+static int sctp_getsockopt_encap_port(struct sock *sk, int len,
+ char __user *optval, int __user *optlen)
+{
+ struct sctp_association *asoc;
+ struct sctp_udpencaps encap;
+ struct sctp_transport *t;
+ __be16 encap_port;
+
+ if (len < sizeof(encap))
+ return -EINVAL;
+
+ len = sizeof(encap);
+ if (copy_from_user(&encap, optval, len))
+ return -EFAULT;
+
+ /* If an address other than INADDR_ANY is specified, and
+ * no transport is found, then the request is invalid.
+ */
+ if (!sctp_is_any(sk, (union sctp_addr *)&encap.sue_address)) {
+ t = sctp_addr_id2transport(sk, &encap.sue_address,
+ encap.sue_assoc_id);
+ if (!t) {
+ pr_debug("%s: failed no transport\n", __func__);
+ return -EINVAL;
+ }
+
+ encap_port = t->encap_port;
+ goto out;
+ }
+
+ /* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
+ * socket is a one to many style socket, and an association
+ * was not found, then the id was invalid.
+ */
+ asoc = sctp_id2assoc(sk, encap.sue_assoc_id);
+ if (!asoc && encap.sue_assoc_id != SCTP_FUTURE_ASSOC &&
+ sctp_style(sk, UDP)) {
+ pr_debug("%s: failed no association\n", __func__);
+ return -EINVAL;
+ }
+
+ if (asoc) {
+ encap_port = asoc->encap_port;
+ goto out;
+ }
+
+ encap_port = sctp_sk(sk)->encap_port;
+
+out:
+ encap.sue_port = (__force uint16_t)encap_port;
+ if (copy_to_user(optval, &encap, len))
+ return -EFAULT;
+
+ if (put_user(len, optlen))
+ return -EFAULT;
+
+ return 0;
+}
+
static int sctp_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen)
{
@@ -8011,6 +8122,9 @@ static int sctp_getsockopt(struct sock *sk, int level,
int optname,
case SCTP_EXPOSE_POTENTIALLY_FAILED_STATE:
retval = sctp_getsockopt_pf_expose(sk, len, optval, optlen);
break;
+ case SCTP_REMOTE_UDP_ENCAPS_PORT:
+ retval = sctp_getsockopt_encap_port(sk, len, optval, optlen);
+ break;
default:
retval = -ENOPROTOOPT;
break;
--
2.1.0
