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authorDavid Howells <dhowells@redhat.com>2017-01-05 10:38:36 +0000
committerDavid Howells <dhowells@redhat.com>2017-01-09 11:10:02 +0000
commit210f035316f545e6f507e7d61e191495ba983e27 (patch)
tree2e8a73099c2adf217251136bad50a8ec4bac840b /net/rxrpc
parent56ff9c837778ba2cf76f29c966856a9341e5939d (diff)
downloadlinux-210f035316f545e6f507e7d61e191495ba983e27.tar.bz2
rxrpc: Allow listen(sock, 0) to be used to disable listening
Allow listen() with a backlog of 0 to be used to disable listening on an AF_RXRPC socket. This also releases any preallocation, thereby making it easier for a kernel service to account for all allocated call structures when shutting down the service. The socket cannot thereafter have listening reenabled, but must rather be closed and reopened. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc')
-rw-r--r--net/rxrpc/af_rxrpc.c8
-rw-r--r--net/rxrpc/ar-internal.h1
-rw-r--r--net/rxrpc/call_accept.c3
3 files changed, 11 insertions, 1 deletions
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 5f63f6dcaabb..199b46e93e64 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -224,6 +224,14 @@ static int rxrpc_listen(struct socket *sock, int backlog)
else
sk->sk_max_ack_backlog = old;
break;
+ case RXRPC_SERVER_LISTENING:
+ if (backlog == 0) {
+ rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED;
+ sk->sk_max_ack_backlog = 0;
+ rxrpc_discard_prealloc(rx);
+ ret = 0;
+ break;
+ }
default:
ret = -EBUSY;
break;
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index 84927c7b5fdf..12be432be9b2 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -60,6 +60,7 @@ enum {
RXRPC_CLIENT_BOUND, /* client local address bound */
RXRPC_SERVER_BOUND, /* server local address bound */
RXRPC_SERVER_LISTENING, /* server listening for connections */
+ RXRPC_SERVER_LISTEN_DISABLED, /* server listening disabled */
RXRPC_CLOSE, /* socket is being closed */
};
diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c
index 832d854c2d5c..7c4c64ab8da2 100644
--- a/net/rxrpc/call_accept.c
+++ b/net/rxrpc/call_accept.c
@@ -349,7 +349,8 @@ struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *local,
found_service:
spin_lock(&rx->incoming_lock);
- if (rx->sk.sk_state == RXRPC_CLOSE) {
+ if (rx->sk.sk_state == RXRPC_SERVER_LISTEN_DISABLED ||
+ rx->sk.sk_state == RXRPC_CLOSE) {
trace_rxrpc_abort("CLS", sp->hdr.cid, sp->hdr.callNumber,
sp->hdr.seq, RX_INVALID_OPERATION, ESHUTDOWN);
skb->mark = RXRPC_SKB_MARK_LOCAL_ABORT;