From: Wei Yongjun <yjwei@xxxxxxxxxxxxxx>
Implement socket option SCTP_GET_ASSOC_NUMBER of the latest ietf socket
extensions API draft.
8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
This option gets the current number of associations that are attached
to a one-to-many style socket. The option value is an uint32_t.
Signed-off-by: Wei Yongjun <yjwei@xxxxxxxxxxxxxx>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@xxxxxx>
---
include/net/sctp/user.h | 2 ++
net/sctp/socket.c | 35 +++++++++++++++++++++++++++++++++++
2 files changed, 37 insertions(+), 0 deletions(-)
diff --git a/include/net/sctp/user.h b/include/net/sctp/user.h
index f205b10..b259fc5 100644
--- a/include/net/sctp/user.h
+++ b/include/net/sctp/user.h
@@ -118,6 +118,8 @@ enum sctp_optname {
#define SCTP_PEER_AUTH_CHUNKS SCTP_PEER_AUTH_CHUNKS
SCTP_LOCAL_AUTH_CHUNKS, /* Read only */
#define SCTP_LOCAL_AUTH_CHUNKS SCTP_LOCAL_AUTH_CHUNKS
+ SCTP_GET_ASSOC_NUMBER, /* Read only */
+#define SCTP_GET_ASSOC_NUMBER SCTP_GET_ASSOC_NUMBER
/* Internal Socket Options. Some of the sctp library functions are
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index e432927..9f5fe23 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5460,6 +5460,38 @@ num:
return 0;
}
+/*
+ * 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
+ * This option gets the current number of associations that are attached
+ * to a one-to-many style socket. The option value is an uint32_t.
+ */
+static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
+ char __user *optval, int __user *optlen)
+{
+ struct sctp_sock *sp = sctp_sk(sk);
+ struct sctp_association *asoc;
+ u32 val = 0;
+
+ if (sctp_style(sk, TCP))
+ return -EOPNOTSUPP;
+
+ if (len < sizeof(u32))
+ return -EINVAL;
+
+ len = sizeof(u32);
+
+ list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
+ val++;
+ }
+
+ if (put_user(len, optlen))
+ return -EFAULT;
+ if (copy_to_user(optval, &val, len))
+ return -EFAULT;
+
+ return 0;
+}
+
SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen)
{
@@ -5602,6 +5634,9 @@ SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
optlen);
break;
+ case SCTP_GET_ASSOC_NUMBER:
+ retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
+ break;
default:
retval = -ENOPROTOOPT;
break;
--
1.5.3.5
--
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