sctp: implement socket option SCTP_GET_ASSOC_ID_LIST
This patch Implement socket option SCTP_GET_ASSOC_ID_LIST.
SCTP Socket API Extension:
8.2.6. Get the Current Identifiers of Associations
(SCTP_GET_ASSOC_ID_LIST)
This option gets the current list of SCTP association identifiers of
the SCTP associations handled by a one-to-many style socket.
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 431b890..f694ee1 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5277,6 +5277,55 @@
return 0;
}
+/*
+ * 8.2.6. Get the Current Identifiers of Associations
+ * (SCTP_GET_ASSOC_ID_LIST)
+ *
+ * This option gets the current list of SCTP association identifiers of
+ * the SCTP associations handled by a one-to-many style socket.
+ */
+static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
+ char __user *optval, int __user *optlen)
+{
+ struct sctp_sock *sp = sctp_sk(sk);
+ struct sctp_association *asoc;
+ struct sctp_assoc_ids *ids;
+ u32 num = 0;
+
+ if (sctp_style(sk, TCP))
+ return -EOPNOTSUPP;
+
+ if (len < sizeof(struct sctp_assoc_ids))
+ return -EINVAL;
+
+ list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
+ num++;
+ }
+
+ if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
+ return -EINVAL;
+
+ len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;
+
+ ids = kmalloc(len, GFP_KERNEL);
+ if (unlikely(!ids))
+ return -ENOMEM;
+
+ ids->gaids_number_of_ids = num;
+ num = 0;
+ list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
+ ids->gaids_assoc_id[num++] = asoc->assoc_id;
+ }
+
+ if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
+ kfree(ids);
+ return -EFAULT;
+ }
+
+ kfree(ids);
+ return 0;
+}
+
SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen)
{
@@ -5409,6 +5458,9 @@
case SCTP_GET_ASSOC_NUMBER:
retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
break;
+ case SCTP_GET_ASSOC_ID_LIST:
+ retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
+ break;
default:
retval = -ENOPROTOOPT;
break;