From 210f035316f545e6f507e7d61e191495ba983e27 Mon Sep 17 00:00:00 2001 From: David Howells Date: Thu, 5 Jan 2017 10:38:36 +0000 Subject: [PATCH] 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 --- net/rxrpc/af_rxrpc.c | 8 ++++++++ net/rxrpc/ar-internal.h | 1 + net/rxrpc/call_accept.c | 3 ++- 3 files changed, 11 insertions(+), 1 deletion(-) 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; -- 2.30.2