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net/rds Add getsockopt support for SO_RDS_TRANSPORT
The currently attached transport for a PF_RDS socket may be obtained from user space by invoking getsockopt(2) using the SO_RDS_TRANSPORT option at the SOL_RDS level. The integer optval returned will be one of the RDS_TRANS_* constants defined in linux/rds.h. Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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1 changed files with 14 additions and 0 deletions
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@ -339,6 +339,7 @@ static int rds_getsockopt(struct socket *sock, int level, int optname,
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{
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struct rds_sock *rs = rds_sk_to_rs(sock->sk);
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int ret = -ENOPROTOOPT, len;
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int trans;
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if (level != SOL_RDS)
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goto out;
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@ -364,6 +365,19 @@ static int rds_getsockopt(struct socket *sock, int level, int optname,
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else
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ret = 0;
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break;
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case SO_RDS_TRANSPORT:
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if (len < sizeof(int)) {
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ret = -EINVAL;
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break;
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}
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trans = (rs->rs_transport ? rs->rs_transport->t_type :
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RDS_TRANS_NONE); /* unbound */
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if (put_user(trans, (int __user *)optval) ||
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put_user(sizeof(int), optlen))
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ret = -EFAULT;
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else
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ret = 0;
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break;
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default:
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break;
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}
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