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sctp: Implement socket option SCTP_GET_ASSOC_NUMBER

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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@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wei Yongjun 2008-12-25 16:57:24 -08:00 committed by David S. Miller
parent ea686a2653
commit aea3c5c05d
2 changed files with 37 additions and 0 deletions
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2
include/net/sctp/user.h
View file

@ -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

35
net/sctp/socket.c
View file

@ -5460,6 +5460,38 @@ static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
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;