sctp: Implement socket option SCTP_GET_ASSOC_NUMBER
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>
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@ -118,6 +118,8 @@ enum sctp_optname {
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#define SCTP_PEER_AUTH_CHUNKS SCTP_PEER_AUTH_CHUNKS
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SCTP_LOCAL_AUTH_CHUNKS, /* Read only */
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#define SCTP_LOCAL_AUTH_CHUNKS SCTP_LOCAL_AUTH_CHUNKS
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SCTP_GET_ASSOC_NUMBER, /* Read only */
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#define SCTP_GET_ASSOC_NUMBER SCTP_GET_ASSOC_NUMBER
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/* Internal Socket Options. Some of the sctp library functions are
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@ -5460,6 +5460,38 @@ num:
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return 0;
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}
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/*
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* 8.2.5. Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
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* This option gets the current number of associations that are attached
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* to a one-to-many style socket. The option value is an uint32_t.
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*/
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static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
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char __user *optval, int __user *optlen)
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{
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struct sctp_sock *sp = sctp_sk(sk);
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struct sctp_association *asoc;
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u32 val = 0;
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if (sctp_style(sk, TCP))
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return -EOPNOTSUPP;
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if (len < sizeof(u32))
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return -EINVAL;
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len = sizeof(u32);
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list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
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val++;
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}
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if (put_user(len, optlen))
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return -EFAULT;
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if (copy_to_user(optval, &val, len))
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return -EFAULT;
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return 0;
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}
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SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
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char __user *optval, int __user *optlen)
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{
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@ -5602,6 +5634,9 @@ SCTP_STATIC int sctp_getsockopt(struct sock *sk, int level, int optname,
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retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
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optlen);
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break;
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case SCTP_GET_ASSOC_NUMBER:
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retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
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break;
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default:
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retval = -ENOPROTOOPT;
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break;
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