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authorDavid Howells <dhowells@redhat.com>2017-06-07 18:27:15 +0300
committerDavid Howells <dhowells@redhat.com>2017-06-07 19:15:46 +0300
commit515559ca21713218595f3a4dad44a4e7eea2fcfb (patch)
tree120f6e8449b032b1d29d6ea123460c0fe8b8c82d /net/rxrpc
parent216fe8f021e33c36e3b27c49c9f1951f6b037d7f (diff)
downloadlinux-515559ca21713218595f3a4dad44a4e7eea2fcfb.tar.xz
rxrpc: Provide a getsockopt call to query what cmsgs types are supported
Provide a getsockopt() call that can query what cmsg types are supported by AF_RXRPC.
Diffstat (limited to 'net/rxrpc')
-rw-r--r--net/rxrpc/af_rxrpc.c30
1 files changed, 29 insertions, 1 deletions
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 0c4dc4a7832c..44a52b82bb5d 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -582,6 +582,34 @@ error:
}
/*
+ * Get socket options.
+ */
+static int rxrpc_getsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, int __user *_optlen)
+{
+ int optlen;
+
+ if (level != SOL_RXRPC)
+ return -EOPNOTSUPP;
+
+ if (get_user(optlen, _optlen))
+ return -EFAULT;
+
+ switch (optname) {
+ case RXRPC_SUPPORTED_CMSG:
+ if (optlen < sizeof(int))
+ return -ETOOSMALL;
+ if (put_user(RXRPC__SUPPORTED - 1, (int __user *)optval) ||
+ put_user(sizeof(int), _optlen))
+ return -EFAULT;
+ return 0;
+
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+/*
* permit an RxRPC socket to be polled
*/
static unsigned int rxrpc_poll(struct file *file, struct socket *sock,
@@ -784,7 +812,7 @@ static const struct proto_ops rxrpc_rpc_ops = {
.listen = rxrpc_listen,
.shutdown = rxrpc_shutdown,
.setsockopt = rxrpc_setsockopt,
- .getsockopt = sock_no_getsockopt,
+ .getsockopt = rxrpc_getsockopt,
.sendmsg = rxrpc_sendmsg,
.recvmsg = rxrpc_recvmsg,
.mmap = sock_no_mmap,